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6cbd5570 CM |
1 | /* |
2 | * Copyright (C) 2007 Oracle. All rights reserved. | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or | |
5 | * modify it under the terms of the GNU General Public | |
6 | * License v2 as published by the Free Software Foundation. | |
7 | * | |
8 | * This program is distributed in the hope that it will be useful, | |
9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
11 | * General Public License for more details. | |
12 | * | |
13 | * You should have received a copy of the GNU General Public | |
14 | * License along with this program; if not, write to the | |
15 | * Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
16 | * Boston, MA 021110-1307, USA. | |
17 | */ | |
18 | ||
8f18cf13 | 19 | #include <linux/kernel.h> |
065631f6 | 20 | #include <linux/bio.h> |
39279cc3 | 21 | #include <linux/buffer_head.h> |
f2eb0a24 | 22 | #include <linux/file.h> |
39279cc3 CM |
23 | #include <linux/fs.h> |
24 | #include <linux/pagemap.h> | |
25 | #include <linux/highmem.h> | |
26 | #include <linux/time.h> | |
27 | #include <linux/init.h> | |
28 | #include <linux/string.h> | |
39279cc3 CM |
29 | #include <linux/backing-dev.h> |
30 | #include <linux/mpage.h> | |
31 | #include <linux/swap.h> | |
32 | #include <linux/writeback.h> | |
33 | #include <linux/statfs.h> | |
34 | #include <linux/compat.h> | |
9ebefb18 | 35 | #include <linux/bit_spinlock.h> |
5103e947 | 36 | #include <linux/xattr.h> |
33268eaf | 37 | #include <linux/posix_acl.h> |
d899e052 | 38 | #include <linux/falloc.h> |
5a0e3ad6 | 39 | #include <linux/slab.h> |
7a36ddec | 40 | #include <linux/ratelimit.h> |
22c44fe6 | 41 | #include <linux/mount.h> |
55e301fd | 42 | #include <linux/btrfs.h> |
53b381b3 | 43 | #include <linux/blkdev.h> |
f23b5a59 | 44 | #include <linux/posix_acl_xattr.h> |
e2e40f2c | 45 | #include <linux/uio.h> |
39279cc3 CM |
46 | #include "ctree.h" |
47 | #include "disk-io.h" | |
48 | #include "transaction.h" | |
49 | #include "btrfs_inode.h" | |
39279cc3 | 50 | #include "print-tree.h" |
e6dcd2dc | 51 | #include "ordered-data.h" |
95819c05 | 52 | #include "xattr.h" |
e02119d5 | 53 | #include "tree-log.h" |
4a54c8c1 | 54 | #include "volumes.h" |
c8b97818 | 55 | #include "compression.h" |
b4ce94de | 56 | #include "locking.h" |
dc89e982 | 57 | #include "free-space-cache.h" |
581bb050 | 58 | #include "inode-map.h" |
38c227d8 | 59 | #include "backref.h" |
f23b5a59 | 60 | #include "hash.h" |
63541927 | 61 | #include "props.h" |
31193213 | 62 | #include "qgroup.h" |
39279cc3 CM |
63 | |
64 | struct btrfs_iget_args { | |
90d3e592 | 65 | struct btrfs_key *location; |
39279cc3 CM |
66 | struct btrfs_root *root; |
67 | }; | |
68 | ||
f28a4928 FM |
69 | struct btrfs_dio_data { |
70 | u64 outstanding_extents; | |
71 | u64 reserve; | |
72 | u64 unsubmitted_oe_range_start; | |
73 | u64 unsubmitted_oe_range_end; | |
74 | }; | |
75 | ||
6e1d5dcc AD |
76 | static const struct inode_operations btrfs_dir_inode_operations; |
77 | static const struct inode_operations btrfs_symlink_inode_operations; | |
78 | static const struct inode_operations btrfs_dir_ro_inode_operations; | |
79 | static const struct inode_operations btrfs_special_inode_operations; | |
80 | static const struct inode_operations btrfs_file_inode_operations; | |
7f09410b AD |
81 | static const struct address_space_operations btrfs_aops; |
82 | static const struct address_space_operations btrfs_symlink_aops; | |
828c0950 | 83 | static const struct file_operations btrfs_dir_file_operations; |
20e5506b | 84 | static const struct extent_io_ops btrfs_extent_io_ops; |
39279cc3 CM |
85 | |
86 | static struct kmem_cache *btrfs_inode_cachep; | |
87 | struct kmem_cache *btrfs_trans_handle_cachep; | |
88 | struct kmem_cache *btrfs_transaction_cachep; | |
39279cc3 | 89 | struct kmem_cache *btrfs_path_cachep; |
dc89e982 | 90 | struct kmem_cache *btrfs_free_space_cachep; |
39279cc3 CM |
91 | |
92 | #define S_SHIFT 12 | |
4d4ab6d6 | 93 | static const unsigned char btrfs_type_by_mode[S_IFMT >> S_SHIFT] = { |
39279cc3 CM |
94 | [S_IFREG >> S_SHIFT] = BTRFS_FT_REG_FILE, |
95 | [S_IFDIR >> S_SHIFT] = BTRFS_FT_DIR, | |
96 | [S_IFCHR >> S_SHIFT] = BTRFS_FT_CHRDEV, | |
97 | [S_IFBLK >> S_SHIFT] = BTRFS_FT_BLKDEV, | |
98 | [S_IFIFO >> S_SHIFT] = BTRFS_FT_FIFO, | |
99 | [S_IFSOCK >> S_SHIFT] = BTRFS_FT_SOCK, | |
100 | [S_IFLNK >> S_SHIFT] = BTRFS_FT_SYMLINK, | |
101 | }; | |
102 | ||
3972f260 | 103 | static int btrfs_setsize(struct inode *inode, struct iattr *attr); |
a41ad394 | 104 | static int btrfs_truncate(struct inode *inode); |
5fd02043 | 105 | static int btrfs_finish_ordered_io(struct btrfs_ordered_extent *ordered_extent); |
771ed689 CM |
106 | static noinline int cow_file_range(struct inode *inode, |
107 | struct page *locked_page, | |
108 | u64 start, u64 end, int *page_started, | |
109 | unsigned long *nr_written, int unlock); | |
70c8a91c JB |
110 | static struct extent_map *create_pinned_em(struct inode *inode, u64 start, |
111 | u64 len, u64 orig_start, | |
112 | u64 block_start, u64 block_len, | |
cc95bef6 JB |
113 | u64 orig_block_len, u64 ram_bytes, |
114 | int type); | |
7b128766 | 115 | |
48a3b636 | 116 | static int btrfs_dirty_inode(struct inode *inode); |
7b128766 | 117 | |
6a3891c5 JB |
118 | #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS |
119 | void btrfs_test_inode_set_ops(struct inode *inode) | |
120 | { | |
121 | BTRFS_I(inode)->io_tree.ops = &btrfs_extent_io_ops; | |
122 | } | |
123 | #endif | |
124 | ||
f34f57a3 | 125 | static int btrfs_init_inode_security(struct btrfs_trans_handle *trans, |
2a7dba39 EP |
126 | struct inode *inode, struct inode *dir, |
127 | const struct qstr *qstr) | |
0279b4cd JO |
128 | { |
129 | int err; | |
130 | ||
f34f57a3 | 131 | err = btrfs_init_acl(trans, inode, dir); |
0279b4cd | 132 | if (!err) |
2a7dba39 | 133 | err = btrfs_xattr_security_init(trans, inode, dir, qstr); |
0279b4cd JO |
134 | return err; |
135 | } | |
136 | ||
c8b97818 CM |
137 | /* |
138 | * this does all the hard work for inserting an inline extent into | |
139 | * the btree. The caller should have done a btrfs_drop_extents so that | |
140 | * no overlapping inline items exist in the btree | |
141 | */ | |
40f76580 | 142 | static int insert_inline_extent(struct btrfs_trans_handle *trans, |
1acae57b | 143 | struct btrfs_path *path, int extent_inserted, |
c8b97818 CM |
144 | struct btrfs_root *root, struct inode *inode, |
145 | u64 start, size_t size, size_t compressed_size, | |
fe3f566c | 146 | int compress_type, |
c8b97818 CM |
147 | struct page **compressed_pages) |
148 | { | |
c8b97818 CM |
149 | struct extent_buffer *leaf; |
150 | struct page *page = NULL; | |
151 | char *kaddr; | |
152 | unsigned long ptr; | |
153 | struct btrfs_file_extent_item *ei; | |
154 | int err = 0; | |
155 | int ret; | |
156 | size_t cur_size = size; | |
c8b97818 | 157 | unsigned long offset; |
c8b97818 | 158 | |
fe3f566c | 159 | if (compressed_size && compressed_pages) |
c8b97818 | 160 | cur_size = compressed_size; |
c8b97818 | 161 | |
1acae57b | 162 | inode_add_bytes(inode, size); |
c8b97818 | 163 | |
1acae57b FDBM |
164 | if (!extent_inserted) { |
165 | struct btrfs_key key; | |
166 | size_t datasize; | |
c8b97818 | 167 | |
1acae57b FDBM |
168 | key.objectid = btrfs_ino(inode); |
169 | key.offset = start; | |
962a298f | 170 | key.type = BTRFS_EXTENT_DATA_KEY; |
c8b97818 | 171 | |
1acae57b FDBM |
172 | datasize = btrfs_file_extent_calc_inline_size(cur_size); |
173 | path->leave_spinning = 1; | |
174 | ret = btrfs_insert_empty_item(trans, root, path, &key, | |
175 | datasize); | |
176 | if (ret) { | |
177 | err = ret; | |
178 | goto fail; | |
179 | } | |
c8b97818 CM |
180 | } |
181 | leaf = path->nodes[0]; | |
182 | ei = btrfs_item_ptr(leaf, path->slots[0], | |
183 | struct btrfs_file_extent_item); | |
184 | btrfs_set_file_extent_generation(leaf, ei, trans->transid); | |
185 | btrfs_set_file_extent_type(leaf, ei, BTRFS_FILE_EXTENT_INLINE); | |
186 | btrfs_set_file_extent_encryption(leaf, ei, 0); | |
187 | btrfs_set_file_extent_other_encoding(leaf, ei, 0); | |
188 | btrfs_set_file_extent_ram_bytes(leaf, ei, size); | |
189 | ptr = btrfs_file_extent_inline_start(ei); | |
190 | ||
261507a0 | 191 | if (compress_type != BTRFS_COMPRESS_NONE) { |
c8b97818 CM |
192 | struct page *cpage; |
193 | int i = 0; | |
d397712b | 194 | while (compressed_size > 0) { |
c8b97818 | 195 | cpage = compressed_pages[i]; |
5b050f04 | 196 | cur_size = min_t(unsigned long, compressed_size, |
c8b97818 CM |
197 | PAGE_CACHE_SIZE); |
198 | ||
7ac687d9 | 199 | kaddr = kmap_atomic(cpage); |
c8b97818 | 200 | write_extent_buffer(leaf, kaddr, ptr, cur_size); |
7ac687d9 | 201 | kunmap_atomic(kaddr); |
c8b97818 CM |
202 | |
203 | i++; | |
204 | ptr += cur_size; | |
205 | compressed_size -= cur_size; | |
206 | } | |
207 | btrfs_set_file_extent_compression(leaf, ei, | |
261507a0 | 208 | compress_type); |
c8b97818 CM |
209 | } else { |
210 | page = find_get_page(inode->i_mapping, | |
211 | start >> PAGE_CACHE_SHIFT); | |
212 | btrfs_set_file_extent_compression(leaf, ei, 0); | |
7ac687d9 | 213 | kaddr = kmap_atomic(page); |
c8b97818 CM |
214 | offset = start & (PAGE_CACHE_SIZE - 1); |
215 | write_extent_buffer(leaf, kaddr + offset, ptr, size); | |
7ac687d9 | 216 | kunmap_atomic(kaddr); |
c8b97818 CM |
217 | page_cache_release(page); |
218 | } | |
219 | btrfs_mark_buffer_dirty(leaf); | |
1acae57b | 220 | btrfs_release_path(path); |
c8b97818 | 221 | |
c2167754 YZ |
222 | /* |
223 | * we're an inline extent, so nobody can | |
224 | * extend the file past i_size without locking | |
225 | * a page we already have locked. | |
226 | * | |
227 | * We must do any isize and inode updates | |
228 | * before we unlock the pages. Otherwise we | |
229 | * could end up racing with unlink. | |
230 | */ | |
c8b97818 | 231 | BTRFS_I(inode)->disk_i_size = inode->i_size; |
79787eaa | 232 | ret = btrfs_update_inode(trans, root, inode); |
c2167754 | 233 | |
79787eaa | 234 | return ret; |
c8b97818 | 235 | fail: |
c8b97818 CM |
236 | return err; |
237 | } | |
238 | ||
239 | ||
240 | /* | |
241 | * conditionally insert an inline extent into the file. This | |
242 | * does the checks required to make sure the data is small enough | |
243 | * to fit as an inline extent. | |
244 | */ | |
00361589 JB |
245 | static noinline int cow_file_range_inline(struct btrfs_root *root, |
246 | struct inode *inode, u64 start, | |
247 | u64 end, size_t compressed_size, | |
248 | int compress_type, | |
249 | struct page **compressed_pages) | |
c8b97818 | 250 | { |
00361589 | 251 | struct btrfs_trans_handle *trans; |
c8b97818 CM |
252 | u64 isize = i_size_read(inode); |
253 | u64 actual_end = min(end + 1, isize); | |
254 | u64 inline_len = actual_end - start; | |
fda2832f | 255 | u64 aligned_end = ALIGN(end, root->sectorsize); |
c8b97818 CM |
256 | u64 data_len = inline_len; |
257 | int ret; | |
1acae57b FDBM |
258 | struct btrfs_path *path; |
259 | int extent_inserted = 0; | |
260 | u32 extent_item_size; | |
c8b97818 CM |
261 | |
262 | if (compressed_size) | |
263 | data_len = compressed_size; | |
264 | ||
265 | if (start > 0 || | |
354877be WS |
266 | actual_end > PAGE_CACHE_SIZE || |
267 | data_len > BTRFS_MAX_INLINE_DATA_SIZE(root) || | |
c8b97818 CM |
268 | (!compressed_size && |
269 | (actual_end & (root->sectorsize - 1)) == 0) || | |
270 | end + 1 < isize || | |
271 | data_len > root->fs_info->max_inline) { | |
272 | return 1; | |
273 | } | |
274 | ||
1acae57b FDBM |
275 | path = btrfs_alloc_path(); |
276 | if (!path) | |
277 | return -ENOMEM; | |
278 | ||
00361589 | 279 | trans = btrfs_join_transaction(root); |
1acae57b FDBM |
280 | if (IS_ERR(trans)) { |
281 | btrfs_free_path(path); | |
00361589 | 282 | return PTR_ERR(trans); |
1acae57b | 283 | } |
00361589 JB |
284 | trans->block_rsv = &root->fs_info->delalloc_block_rsv; |
285 | ||
1acae57b FDBM |
286 | if (compressed_size && compressed_pages) |
287 | extent_item_size = btrfs_file_extent_calc_inline_size( | |
288 | compressed_size); | |
289 | else | |
290 | extent_item_size = btrfs_file_extent_calc_inline_size( | |
291 | inline_len); | |
292 | ||
293 | ret = __btrfs_drop_extents(trans, root, inode, path, | |
294 | start, aligned_end, NULL, | |
295 | 1, 1, extent_item_size, &extent_inserted); | |
00361589 JB |
296 | if (ret) { |
297 | btrfs_abort_transaction(trans, root, ret); | |
298 | goto out; | |
299 | } | |
c8b97818 CM |
300 | |
301 | if (isize > actual_end) | |
302 | inline_len = min_t(u64, isize, actual_end); | |
1acae57b FDBM |
303 | ret = insert_inline_extent(trans, path, extent_inserted, |
304 | root, inode, start, | |
c8b97818 | 305 | inline_len, compressed_size, |
fe3f566c | 306 | compress_type, compressed_pages); |
2adcac1a | 307 | if (ret && ret != -ENOSPC) { |
79787eaa | 308 | btrfs_abort_transaction(trans, root, ret); |
00361589 | 309 | goto out; |
2adcac1a | 310 | } else if (ret == -ENOSPC) { |
00361589 JB |
311 | ret = 1; |
312 | goto out; | |
79787eaa | 313 | } |
2adcac1a | 314 | |
bdc20e67 | 315 | set_bit(BTRFS_INODE_NEEDS_FULL_SYNC, &BTRFS_I(inode)->runtime_flags); |
0ca1f7ce | 316 | btrfs_delalloc_release_metadata(inode, end + 1 - start); |
a1ed835e | 317 | btrfs_drop_extent_cache(inode, start, aligned_end - 1, 0); |
00361589 | 318 | out: |
94ed938a QW |
319 | /* |
320 | * Don't forget to free the reserved space, as for inlined extent | |
321 | * it won't count as data extent, free them directly here. | |
322 | * And at reserve time, it's always aligned to page size, so | |
323 | * just free one page here. | |
324 | */ | |
325 | btrfs_qgroup_free_data(inode, 0, PAGE_CACHE_SIZE); | |
1acae57b | 326 | btrfs_free_path(path); |
00361589 JB |
327 | btrfs_end_transaction(trans, root); |
328 | return ret; | |
c8b97818 CM |
329 | } |
330 | ||
771ed689 CM |
331 | struct async_extent { |
332 | u64 start; | |
333 | u64 ram_size; | |
334 | u64 compressed_size; | |
335 | struct page **pages; | |
336 | unsigned long nr_pages; | |
261507a0 | 337 | int compress_type; |
771ed689 CM |
338 | struct list_head list; |
339 | }; | |
340 | ||
341 | struct async_cow { | |
342 | struct inode *inode; | |
343 | struct btrfs_root *root; | |
344 | struct page *locked_page; | |
345 | u64 start; | |
346 | u64 end; | |
347 | struct list_head extents; | |
348 | struct btrfs_work work; | |
349 | }; | |
350 | ||
351 | static noinline int add_async_extent(struct async_cow *cow, | |
352 | u64 start, u64 ram_size, | |
353 | u64 compressed_size, | |
354 | struct page **pages, | |
261507a0 LZ |
355 | unsigned long nr_pages, |
356 | int compress_type) | |
771ed689 CM |
357 | { |
358 | struct async_extent *async_extent; | |
359 | ||
360 | async_extent = kmalloc(sizeof(*async_extent), GFP_NOFS); | |
79787eaa | 361 | BUG_ON(!async_extent); /* -ENOMEM */ |
771ed689 CM |
362 | async_extent->start = start; |
363 | async_extent->ram_size = ram_size; | |
364 | async_extent->compressed_size = compressed_size; | |
365 | async_extent->pages = pages; | |
366 | async_extent->nr_pages = nr_pages; | |
261507a0 | 367 | async_extent->compress_type = compress_type; |
771ed689 CM |
368 | list_add_tail(&async_extent->list, &cow->extents); |
369 | return 0; | |
370 | } | |
371 | ||
f79707b0 WS |
372 | static inline int inode_need_compress(struct inode *inode) |
373 | { | |
374 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
375 | ||
376 | /* force compress */ | |
377 | if (btrfs_test_opt(root, FORCE_COMPRESS)) | |
378 | return 1; | |
379 | /* bad compression ratios */ | |
380 | if (BTRFS_I(inode)->flags & BTRFS_INODE_NOCOMPRESS) | |
381 | return 0; | |
382 | if (btrfs_test_opt(root, COMPRESS) || | |
383 | BTRFS_I(inode)->flags & BTRFS_INODE_COMPRESS || | |
384 | BTRFS_I(inode)->force_compress) | |
385 | return 1; | |
386 | return 0; | |
387 | } | |
388 | ||
d352ac68 | 389 | /* |
771ed689 CM |
390 | * we create compressed extents in two phases. The first |
391 | * phase compresses a range of pages that have already been | |
392 | * locked (both pages and state bits are locked). | |
c8b97818 | 393 | * |
771ed689 CM |
394 | * This is done inside an ordered work queue, and the compression |
395 | * is spread across many cpus. The actual IO submission is step | |
396 | * two, and the ordered work queue takes care of making sure that | |
397 | * happens in the same order things were put onto the queue by | |
398 | * writepages and friends. | |
c8b97818 | 399 | * |
771ed689 CM |
400 | * If this code finds it can't get good compression, it puts an |
401 | * entry onto the work queue to write the uncompressed bytes. This | |
402 | * makes sure that both compressed inodes and uncompressed inodes | |
b2570314 AB |
403 | * are written in the same order that the flusher thread sent them |
404 | * down. | |
d352ac68 | 405 | */ |
c44f649e | 406 | static noinline void compress_file_range(struct inode *inode, |
771ed689 CM |
407 | struct page *locked_page, |
408 | u64 start, u64 end, | |
409 | struct async_cow *async_cow, | |
410 | int *num_added) | |
b888db2b CM |
411 | { |
412 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
db94535d | 413 | u64 num_bytes; |
db94535d | 414 | u64 blocksize = root->sectorsize; |
c8b97818 | 415 | u64 actual_end; |
42dc7bab | 416 | u64 isize = i_size_read(inode); |
e6dcd2dc | 417 | int ret = 0; |
c8b97818 CM |
418 | struct page **pages = NULL; |
419 | unsigned long nr_pages; | |
420 | unsigned long nr_pages_ret = 0; | |
421 | unsigned long total_compressed = 0; | |
422 | unsigned long total_in = 0; | |
ee22184b BL |
423 | unsigned long max_compressed = SZ_128K; |
424 | unsigned long max_uncompressed = SZ_128K; | |
c8b97818 CM |
425 | int i; |
426 | int will_compress; | |
261507a0 | 427 | int compress_type = root->fs_info->compress_type; |
4adaa611 | 428 | int redirty = 0; |
b888db2b | 429 | |
4cb13e5d | 430 | /* if this is a small write inside eof, kick off a defrag */ |
ee22184b | 431 | if ((end - start + 1) < SZ_16K && |
4cb13e5d | 432 | (start > 0 || end + 1 < BTRFS_I(inode)->disk_i_size)) |
4cb5300b CM |
433 | btrfs_add_inode_defrag(NULL, inode); |
434 | ||
42dc7bab | 435 | actual_end = min_t(u64, isize, end + 1); |
c8b97818 CM |
436 | again: |
437 | will_compress = 0; | |
438 | nr_pages = (end >> PAGE_CACHE_SHIFT) - (start >> PAGE_CACHE_SHIFT) + 1; | |
ee22184b | 439 | nr_pages = min_t(unsigned long, nr_pages, SZ_128K / PAGE_CACHE_SIZE); |
be20aa9d | 440 | |
f03d9301 CM |
441 | /* |
442 | * we don't want to send crud past the end of i_size through | |
443 | * compression, that's just a waste of CPU time. So, if the | |
444 | * end of the file is before the start of our current | |
445 | * requested range of bytes, we bail out to the uncompressed | |
446 | * cleanup code that can deal with all of this. | |
447 | * | |
448 | * It isn't really the fastest way to fix things, but this is a | |
449 | * very uncommon corner. | |
450 | */ | |
451 | if (actual_end <= start) | |
452 | goto cleanup_and_bail_uncompressed; | |
453 | ||
c8b97818 CM |
454 | total_compressed = actual_end - start; |
455 | ||
4bcbb332 SW |
456 | /* |
457 | * skip compression for a small file range(<=blocksize) that | |
458 | * isn't an inline extent, since it dosen't save disk space at all. | |
459 | */ | |
460 | if (total_compressed <= blocksize && | |
461 | (start > 0 || end + 1 < BTRFS_I(inode)->disk_i_size)) | |
462 | goto cleanup_and_bail_uncompressed; | |
463 | ||
c8b97818 CM |
464 | /* we want to make sure that amount of ram required to uncompress |
465 | * an extent is reasonable, so we limit the total size in ram | |
771ed689 CM |
466 | * of a compressed extent to 128k. This is a crucial number |
467 | * because it also controls how easily we can spread reads across | |
468 | * cpus for decompression. | |
469 | * | |
470 | * We also want to make sure the amount of IO required to do | |
471 | * a random read is reasonably small, so we limit the size of | |
472 | * a compressed extent to 128k. | |
c8b97818 CM |
473 | */ |
474 | total_compressed = min(total_compressed, max_uncompressed); | |
fda2832f | 475 | num_bytes = ALIGN(end - start + 1, blocksize); |
be20aa9d | 476 | num_bytes = max(blocksize, num_bytes); |
c8b97818 CM |
477 | total_in = 0; |
478 | ret = 0; | |
db94535d | 479 | |
771ed689 CM |
480 | /* |
481 | * we do compression for mount -o compress and when the | |
482 | * inode has not been flagged as nocompress. This flag can | |
483 | * change at any time if we discover bad compression ratios. | |
c8b97818 | 484 | */ |
f79707b0 | 485 | if (inode_need_compress(inode)) { |
c8b97818 | 486 | WARN_ON(pages); |
31e818fe | 487 | pages = kcalloc(nr_pages, sizeof(struct page *), GFP_NOFS); |
560f7d75 LZ |
488 | if (!pages) { |
489 | /* just bail out to the uncompressed code */ | |
490 | goto cont; | |
491 | } | |
c8b97818 | 492 | |
261507a0 LZ |
493 | if (BTRFS_I(inode)->force_compress) |
494 | compress_type = BTRFS_I(inode)->force_compress; | |
495 | ||
4adaa611 CM |
496 | /* |
497 | * we need to call clear_page_dirty_for_io on each | |
498 | * page in the range. Otherwise applications with the file | |
499 | * mmap'd can wander in and change the page contents while | |
500 | * we are compressing them. | |
501 | * | |
502 | * If the compression fails for any reason, we set the pages | |
503 | * dirty again later on. | |
504 | */ | |
505 | extent_range_clear_dirty_for_io(inode, start, end); | |
506 | redirty = 1; | |
261507a0 LZ |
507 | ret = btrfs_compress_pages(compress_type, |
508 | inode->i_mapping, start, | |
509 | total_compressed, pages, | |
510 | nr_pages, &nr_pages_ret, | |
511 | &total_in, | |
512 | &total_compressed, | |
513 | max_compressed); | |
c8b97818 CM |
514 | |
515 | if (!ret) { | |
516 | unsigned long offset = total_compressed & | |
517 | (PAGE_CACHE_SIZE - 1); | |
518 | struct page *page = pages[nr_pages_ret - 1]; | |
519 | char *kaddr; | |
520 | ||
521 | /* zero the tail end of the last page, we might be | |
522 | * sending it down to disk | |
523 | */ | |
524 | if (offset) { | |
7ac687d9 | 525 | kaddr = kmap_atomic(page); |
c8b97818 CM |
526 | memset(kaddr + offset, 0, |
527 | PAGE_CACHE_SIZE - offset); | |
7ac687d9 | 528 | kunmap_atomic(kaddr); |
c8b97818 CM |
529 | } |
530 | will_compress = 1; | |
531 | } | |
532 | } | |
560f7d75 | 533 | cont: |
c8b97818 CM |
534 | if (start == 0) { |
535 | /* lets try to make an inline extent */ | |
771ed689 | 536 | if (ret || total_in < (actual_end - start)) { |
c8b97818 | 537 | /* we didn't compress the entire range, try |
771ed689 | 538 | * to make an uncompressed inline extent. |
c8b97818 | 539 | */ |
00361589 JB |
540 | ret = cow_file_range_inline(root, inode, start, end, |
541 | 0, 0, NULL); | |
c8b97818 | 542 | } else { |
771ed689 | 543 | /* try making a compressed inline extent */ |
00361589 | 544 | ret = cow_file_range_inline(root, inode, start, end, |
fe3f566c LZ |
545 | total_compressed, |
546 | compress_type, pages); | |
c8b97818 | 547 | } |
79787eaa | 548 | if (ret <= 0) { |
151a41bc JB |
549 | unsigned long clear_flags = EXTENT_DELALLOC | |
550 | EXTENT_DEFRAG; | |
e6eb4314 FM |
551 | unsigned long page_error_op; |
552 | ||
151a41bc | 553 | clear_flags |= (ret < 0) ? EXTENT_DO_ACCOUNTING : 0; |
e6eb4314 | 554 | page_error_op = ret < 0 ? PAGE_SET_ERROR : 0; |
151a41bc | 555 | |
771ed689 | 556 | /* |
79787eaa JM |
557 | * inline extent creation worked or returned error, |
558 | * we don't need to create any more async work items. | |
559 | * Unlock and free up our temp pages. | |
771ed689 | 560 | */ |
c2790a2e | 561 | extent_clear_unlock_delalloc(inode, start, end, NULL, |
151a41bc | 562 | clear_flags, PAGE_UNLOCK | |
c2790a2e JB |
563 | PAGE_CLEAR_DIRTY | |
564 | PAGE_SET_WRITEBACK | | |
e6eb4314 | 565 | page_error_op | |
c2790a2e | 566 | PAGE_END_WRITEBACK); |
c8b97818 CM |
567 | goto free_pages_out; |
568 | } | |
569 | } | |
570 | ||
571 | if (will_compress) { | |
572 | /* | |
573 | * we aren't doing an inline extent round the compressed size | |
574 | * up to a block size boundary so the allocator does sane | |
575 | * things | |
576 | */ | |
fda2832f | 577 | total_compressed = ALIGN(total_compressed, blocksize); |
c8b97818 CM |
578 | |
579 | /* | |
580 | * one last check to make sure the compression is really a | |
581 | * win, compare the page count read with the blocks on disk | |
582 | */ | |
fda2832f | 583 | total_in = ALIGN(total_in, PAGE_CACHE_SIZE); |
c8b97818 CM |
584 | if (total_compressed >= total_in) { |
585 | will_compress = 0; | |
586 | } else { | |
c8b97818 CM |
587 | num_bytes = total_in; |
588 | } | |
589 | } | |
590 | if (!will_compress && pages) { | |
591 | /* | |
592 | * the compression code ran but failed to make things smaller, | |
593 | * free any pages it allocated and our page pointer array | |
594 | */ | |
595 | for (i = 0; i < nr_pages_ret; i++) { | |
70b99e69 | 596 | WARN_ON(pages[i]->mapping); |
c8b97818 CM |
597 | page_cache_release(pages[i]); |
598 | } | |
599 | kfree(pages); | |
600 | pages = NULL; | |
601 | total_compressed = 0; | |
602 | nr_pages_ret = 0; | |
603 | ||
604 | /* flag the file so we don't compress in the future */ | |
1e701a32 CM |
605 | if (!btrfs_test_opt(root, FORCE_COMPRESS) && |
606 | !(BTRFS_I(inode)->force_compress)) { | |
a555f810 | 607 | BTRFS_I(inode)->flags |= BTRFS_INODE_NOCOMPRESS; |
1e701a32 | 608 | } |
c8b97818 | 609 | } |
771ed689 CM |
610 | if (will_compress) { |
611 | *num_added += 1; | |
c8b97818 | 612 | |
771ed689 CM |
613 | /* the async work queues will take care of doing actual |
614 | * allocation on disk for these compressed pages, | |
615 | * and will submit them to the elevator. | |
616 | */ | |
617 | add_async_extent(async_cow, start, num_bytes, | |
261507a0 LZ |
618 | total_compressed, pages, nr_pages_ret, |
619 | compress_type); | |
179e29e4 | 620 | |
24ae6365 | 621 | if (start + num_bytes < end) { |
771ed689 CM |
622 | start += num_bytes; |
623 | pages = NULL; | |
624 | cond_resched(); | |
625 | goto again; | |
626 | } | |
627 | } else { | |
f03d9301 | 628 | cleanup_and_bail_uncompressed: |
771ed689 CM |
629 | /* |
630 | * No compression, but we still need to write the pages in | |
631 | * the file we've been given so far. redirty the locked | |
632 | * page if it corresponds to our extent and set things up | |
633 | * for the async work queue to run cow_file_range to do | |
634 | * the normal delalloc dance | |
635 | */ | |
636 | if (page_offset(locked_page) >= start && | |
637 | page_offset(locked_page) <= end) { | |
638 | __set_page_dirty_nobuffers(locked_page); | |
639 | /* unlocked later on in the async handlers */ | |
640 | } | |
4adaa611 CM |
641 | if (redirty) |
642 | extent_range_redirty_for_io(inode, start, end); | |
261507a0 LZ |
643 | add_async_extent(async_cow, start, end - start + 1, |
644 | 0, NULL, 0, BTRFS_COMPRESS_NONE); | |
771ed689 CM |
645 | *num_added += 1; |
646 | } | |
3b951516 | 647 | |
c44f649e | 648 | return; |
771ed689 CM |
649 | |
650 | free_pages_out: | |
651 | for (i = 0; i < nr_pages_ret; i++) { | |
652 | WARN_ON(pages[i]->mapping); | |
653 | page_cache_release(pages[i]); | |
654 | } | |
d397712b | 655 | kfree(pages); |
771ed689 | 656 | } |
771ed689 | 657 | |
40ae837b FM |
658 | static void free_async_extent_pages(struct async_extent *async_extent) |
659 | { | |
660 | int i; | |
661 | ||
662 | if (!async_extent->pages) | |
663 | return; | |
664 | ||
665 | for (i = 0; i < async_extent->nr_pages; i++) { | |
666 | WARN_ON(async_extent->pages[i]->mapping); | |
667 | page_cache_release(async_extent->pages[i]); | |
668 | } | |
669 | kfree(async_extent->pages); | |
670 | async_extent->nr_pages = 0; | |
671 | async_extent->pages = NULL; | |
771ed689 CM |
672 | } |
673 | ||
674 | /* | |
675 | * phase two of compressed writeback. This is the ordered portion | |
676 | * of the code, which only gets called in the order the work was | |
677 | * queued. We walk all the async extents created by compress_file_range | |
678 | * and send them down to the disk. | |
679 | */ | |
dec8f175 | 680 | static noinline void submit_compressed_extents(struct inode *inode, |
771ed689 CM |
681 | struct async_cow *async_cow) |
682 | { | |
683 | struct async_extent *async_extent; | |
684 | u64 alloc_hint = 0; | |
771ed689 CM |
685 | struct btrfs_key ins; |
686 | struct extent_map *em; | |
687 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
688 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; | |
689 | struct extent_io_tree *io_tree; | |
f5a84ee3 | 690 | int ret = 0; |
771ed689 | 691 | |
3e04e7f1 | 692 | again: |
d397712b | 693 | while (!list_empty(&async_cow->extents)) { |
771ed689 CM |
694 | async_extent = list_entry(async_cow->extents.next, |
695 | struct async_extent, list); | |
696 | list_del(&async_extent->list); | |
c8b97818 | 697 | |
771ed689 CM |
698 | io_tree = &BTRFS_I(inode)->io_tree; |
699 | ||
f5a84ee3 | 700 | retry: |
771ed689 CM |
701 | /* did the compression code fall back to uncompressed IO? */ |
702 | if (!async_extent->pages) { | |
703 | int page_started = 0; | |
704 | unsigned long nr_written = 0; | |
705 | ||
706 | lock_extent(io_tree, async_extent->start, | |
2ac55d41 | 707 | async_extent->start + |
d0082371 | 708 | async_extent->ram_size - 1); |
771ed689 CM |
709 | |
710 | /* allocate blocks */ | |
f5a84ee3 JB |
711 | ret = cow_file_range(inode, async_cow->locked_page, |
712 | async_extent->start, | |
713 | async_extent->start + | |
714 | async_extent->ram_size - 1, | |
715 | &page_started, &nr_written, 0); | |
771ed689 | 716 | |
79787eaa JM |
717 | /* JDM XXX */ |
718 | ||
771ed689 CM |
719 | /* |
720 | * if page_started, cow_file_range inserted an | |
721 | * inline extent and took care of all the unlocking | |
722 | * and IO for us. Otherwise, we need to submit | |
723 | * all those pages down to the drive. | |
724 | */ | |
f5a84ee3 | 725 | if (!page_started && !ret) |
771ed689 CM |
726 | extent_write_locked_range(io_tree, |
727 | inode, async_extent->start, | |
d397712b | 728 | async_extent->start + |
771ed689 CM |
729 | async_extent->ram_size - 1, |
730 | btrfs_get_extent, | |
731 | WB_SYNC_ALL); | |
3e04e7f1 JB |
732 | else if (ret) |
733 | unlock_page(async_cow->locked_page); | |
771ed689 CM |
734 | kfree(async_extent); |
735 | cond_resched(); | |
736 | continue; | |
737 | } | |
738 | ||
739 | lock_extent(io_tree, async_extent->start, | |
d0082371 | 740 | async_extent->start + async_extent->ram_size - 1); |
771ed689 | 741 | |
00361589 | 742 | ret = btrfs_reserve_extent(root, |
771ed689 CM |
743 | async_extent->compressed_size, |
744 | async_extent->compressed_size, | |
e570fd27 | 745 | 0, alloc_hint, &ins, 1, 1); |
f5a84ee3 | 746 | if (ret) { |
40ae837b | 747 | free_async_extent_pages(async_extent); |
3e04e7f1 | 748 | |
fdf8e2ea JB |
749 | if (ret == -ENOSPC) { |
750 | unlock_extent(io_tree, async_extent->start, | |
751 | async_extent->start + | |
752 | async_extent->ram_size - 1); | |
ce62003f LB |
753 | |
754 | /* | |
755 | * we need to redirty the pages if we decide to | |
756 | * fallback to uncompressed IO, otherwise we | |
757 | * will not submit these pages down to lower | |
758 | * layers. | |
759 | */ | |
760 | extent_range_redirty_for_io(inode, | |
761 | async_extent->start, | |
762 | async_extent->start + | |
763 | async_extent->ram_size - 1); | |
764 | ||
79787eaa | 765 | goto retry; |
fdf8e2ea | 766 | } |
3e04e7f1 | 767 | goto out_free; |
f5a84ee3 | 768 | } |
c2167754 YZ |
769 | /* |
770 | * here we're doing allocation and writeback of the | |
771 | * compressed pages | |
772 | */ | |
773 | btrfs_drop_extent_cache(inode, async_extent->start, | |
774 | async_extent->start + | |
775 | async_extent->ram_size - 1, 0); | |
776 | ||
172ddd60 | 777 | em = alloc_extent_map(); |
b9aa55be LB |
778 | if (!em) { |
779 | ret = -ENOMEM; | |
3e04e7f1 | 780 | goto out_free_reserve; |
b9aa55be | 781 | } |
771ed689 CM |
782 | em->start = async_extent->start; |
783 | em->len = async_extent->ram_size; | |
445a6944 | 784 | em->orig_start = em->start; |
2ab28f32 JB |
785 | em->mod_start = em->start; |
786 | em->mod_len = em->len; | |
c8b97818 | 787 | |
771ed689 CM |
788 | em->block_start = ins.objectid; |
789 | em->block_len = ins.offset; | |
b4939680 | 790 | em->orig_block_len = ins.offset; |
cc95bef6 | 791 | em->ram_bytes = async_extent->ram_size; |
771ed689 | 792 | em->bdev = root->fs_info->fs_devices->latest_bdev; |
261507a0 | 793 | em->compress_type = async_extent->compress_type; |
771ed689 CM |
794 | set_bit(EXTENT_FLAG_PINNED, &em->flags); |
795 | set_bit(EXTENT_FLAG_COMPRESSED, &em->flags); | |
70c8a91c | 796 | em->generation = -1; |
771ed689 | 797 | |
d397712b | 798 | while (1) { |
890871be | 799 | write_lock(&em_tree->lock); |
09a2a8f9 | 800 | ret = add_extent_mapping(em_tree, em, 1); |
890871be | 801 | write_unlock(&em_tree->lock); |
771ed689 CM |
802 | if (ret != -EEXIST) { |
803 | free_extent_map(em); | |
804 | break; | |
805 | } | |
806 | btrfs_drop_extent_cache(inode, async_extent->start, | |
807 | async_extent->start + | |
808 | async_extent->ram_size - 1, 0); | |
809 | } | |
810 | ||
3e04e7f1 JB |
811 | if (ret) |
812 | goto out_free_reserve; | |
813 | ||
261507a0 LZ |
814 | ret = btrfs_add_ordered_extent_compress(inode, |
815 | async_extent->start, | |
816 | ins.objectid, | |
817 | async_extent->ram_size, | |
818 | ins.offset, | |
819 | BTRFS_ORDERED_COMPRESSED, | |
820 | async_extent->compress_type); | |
d9f85963 FM |
821 | if (ret) { |
822 | btrfs_drop_extent_cache(inode, async_extent->start, | |
823 | async_extent->start + | |
824 | async_extent->ram_size - 1, 0); | |
3e04e7f1 | 825 | goto out_free_reserve; |
d9f85963 | 826 | } |
771ed689 | 827 | |
771ed689 CM |
828 | /* |
829 | * clear dirty, set writeback and unlock the pages. | |
830 | */ | |
c2790a2e | 831 | extent_clear_unlock_delalloc(inode, async_extent->start, |
a791e35e CM |
832 | async_extent->start + |
833 | async_extent->ram_size - 1, | |
151a41bc JB |
834 | NULL, EXTENT_LOCKED | EXTENT_DELALLOC, |
835 | PAGE_UNLOCK | PAGE_CLEAR_DIRTY | | |
c2790a2e | 836 | PAGE_SET_WRITEBACK); |
771ed689 | 837 | ret = btrfs_submit_compressed_write(inode, |
d397712b CM |
838 | async_extent->start, |
839 | async_extent->ram_size, | |
840 | ins.objectid, | |
841 | ins.offset, async_extent->pages, | |
842 | async_extent->nr_pages); | |
fce2a4e6 FM |
843 | if (ret) { |
844 | struct extent_io_tree *tree = &BTRFS_I(inode)->io_tree; | |
845 | struct page *p = async_extent->pages[0]; | |
846 | const u64 start = async_extent->start; | |
847 | const u64 end = start + async_extent->ram_size - 1; | |
848 | ||
849 | p->mapping = inode->i_mapping; | |
850 | tree->ops->writepage_end_io_hook(p, start, end, | |
851 | NULL, 0); | |
852 | p->mapping = NULL; | |
853 | extent_clear_unlock_delalloc(inode, start, end, NULL, 0, | |
854 | PAGE_END_WRITEBACK | | |
855 | PAGE_SET_ERROR); | |
40ae837b | 856 | free_async_extent_pages(async_extent); |
fce2a4e6 | 857 | } |
771ed689 CM |
858 | alloc_hint = ins.objectid + ins.offset; |
859 | kfree(async_extent); | |
860 | cond_resched(); | |
861 | } | |
dec8f175 | 862 | return; |
3e04e7f1 | 863 | out_free_reserve: |
e570fd27 | 864 | btrfs_free_reserved_extent(root, ins.objectid, ins.offset, 1); |
79787eaa | 865 | out_free: |
c2790a2e | 866 | extent_clear_unlock_delalloc(inode, async_extent->start, |
3e04e7f1 JB |
867 | async_extent->start + |
868 | async_extent->ram_size - 1, | |
c2790a2e | 869 | NULL, EXTENT_LOCKED | EXTENT_DELALLOC | |
151a41bc JB |
870 | EXTENT_DEFRAG | EXTENT_DO_ACCOUNTING, |
871 | PAGE_UNLOCK | PAGE_CLEAR_DIRTY | | |
704de49d FM |
872 | PAGE_SET_WRITEBACK | PAGE_END_WRITEBACK | |
873 | PAGE_SET_ERROR); | |
40ae837b | 874 | free_async_extent_pages(async_extent); |
79787eaa | 875 | kfree(async_extent); |
3e04e7f1 | 876 | goto again; |
771ed689 CM |
877 | } |
878 | ||
4b46fce2 JB |
879 | static u64 get_extent_allocation_hint(struct inode *inode, u64 start, |
880 | u64 num_bytes) | |
881 | { | |
882 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; | |
883 | struct extent_map *em; | |
884 | u64 alloc_hint = 0; | |
885 | ||
886 | read_lock(&em_tree->lock); | |
887 | em = search_extent_mapping(em_tree, start, num_bytes); | |
888 | if (em) { | |
889 | /* | |
890 | * if block start isn't an actual block number then find the | |
891 | * first block in this inode and use that as a hint. If that | |
892 | * block is also bogus then just don't worry about it. | |
893 | */ | |
894 | if (em->block_start >= EXTENT_MAP_LAST_BYTE) { | |
895 | free_extent_map(em); | |
896 | em = search_extent_mapping(em_tree, 0, 0); | |
897 | if (em && em->block_start < EXTENT_MAP_LAST_BYTE) | |
898 | alloc_hint = em->block_start; | |
899 | if (em) | |
900 | free_extent_map(em); | |
901 | } else { | |
902 | alloc_hint = em->block_start; | |
903 | free_extent_map(em); | |
904 | } | |
905 | } | |
906 | read_unlock(&em_tree->lock); | |
907 | ||
908 | return alloc_hint; | |
909 | } | |
910 | ||
771ed689 CM |
911 | /* |
912 | * when extent_io.c finds a delayed allocation range in the file, | |
913 | * the call backs end up in this code. The basic idea is to | |
914 | * allocate extents on disk for the range, and create ordered data structs | |
915 | * in ram to track those extents. | |
916 | * | |
917 | * locked_page is the page that writepage had locked already. We use | |
918 | * it to make sure we don't do extra locks or unlocks. | |
919 | * | |
920 | * *page_started is set to one if we unlock locked_page and do everything | |
921 | * required to start IO on it. It may be clean and already done with | |
922 | * IO when we return. | |
923 | */ | |
00361589 JB |
924 | static noinline int cow_file_range(struct inode *inode, |
925 | struct page *locked_page, | |
926 | u64 start, u64 end, int *page_started, | |
927 | unsigned long *nr_written, | |
928 | int unlock) | |
771ed689 | 929 | { |
00361589 | 930 | struct btrfs_root *root = BTRFS_I(inode)->root; |
771ed689 CM |
931 | u64 alloc_hint = 0; |
932 | u64 num_bytes; | |
933 | unsigned long ram_size; | |
934 | u64 disk_num_bytes; | |
935 | u64 cur_alloc_size; | |
936 | u64 blocksize = root->sectorsize; | |
771ed689 CM |
937 | struct btrfs_key ins; |
938 | struct extent_map *em; | |
939 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; | |
940 | int ret = 0; | |
941 | ||
02ecd2c2 JB |
942 | if (btrfs_is_free_space_inode(inode)) { |
943 | WARN_ON_ONCE(1); | |
29bce2f3 JB |
944 | ret = -EINVAL; |
945 | goto out_unlock; | |
02ecd2c2 | 946 | } |
771ed689 | 947 | |
fda2832f | 948 | num_bytes = ALIGN(end - start + 1, blocksize); |
771ed689 CM |
949 | num_bytes = max(blocksize, num_bytes); |
950 | disk_num_bytes = num_bytes; | |
771ed689 | 951 | |
4cb5300b | 952 | /* if this is a small write inside eof, kick off defrag */ |
ee22184b | 953 | if (num_bytes < SZ_64K && |
4cb13e5d | 954 | (start > 0 || end + 1 < BTRFS_I(inode)->disk_i_size)) |
00361589 | 955 | btrfs_add_inode_defrag(NULL, inode); |
4cb5300b | 956 | |
771ed689 CM |
957 | if (start == 0) { |
958 | /* lets try to make an inline extent */ | |
00361589 JB |
959 | ret = cow_file_range_inline(root, inode, start, end, 0, 0, |
960 | NULL); | |
771ed689 | 961 | if (ret == 0) { |
c2790a2e JB |
962 | extent_clear_unlock_delalloc(inode, start, end, NULL, |
963 | EXTENT_LOCKED | EXTENT_DELALLOC | | |
151a41bc | 964 | EXTENT_DEFRAG, PAGE_UNLOCK | |
c2790a2e JB |
965 | PAGE_CLEAR_DIRTY | PAGE_SET_WRITEBACK | |
966 | PAGE_END_WRITEBACK); | |
c2167754 | 967 | |
771ed689 CM |
968 | *nr_written = *nr_written + |
969 | (end - start + PAGE_CACHE_SIZE) / PAGE_CACHE_SIZE; | |
970 | *page_started = 1; | |
771ed689 | 971 | goto out; |
79787eaa | 972 | } else if (ret < 0) { |
79787eaa | 973 | goto out_unlock; |
771ed689 CM |
974 | } |
975 | } | |
976 | ||
977 | BUG_ON(disk_num_bytes > | |
6c41761f | 978 | btrfs_super_total_bytes(root->fs_info->super_copy)); |
771ed689 | 979 | |
4b46fce2 | 980 | alloc_hint = get_extent_allocation_hint(inode, start, num_bytes); |
771ed689 CM |
981 | btrfs_drop_extent_cache(inode, start, start + num_bytes - 1, 0); |
982 | ||
d397712b | 983 | while (disk_num_bytes > 0) { |
a791e35e CM |
984 | unsigned long op; |
985 | ||
287a0ab9 | 986 | cur_alloc_size = disk_num_bytes; |
00361589 | 987 | ret = btrfs_reserve_extent(root, cur_alloc_size, |
771ed689 | 988 | root->sectorsize, 0, alloc_hint, |
e570fd27 | 989 | &ins, 1, 1); |
00361589 | 990 | if (ret < 0) |
79787eaa | 991 | goto out_unlock; |
d397712b | 992 | |
172ddd60 | 993 | em = alloc_extent_map(); |
b9aa55be LB |
994 | if (!em) { |
995 | ret = -ENOMEM; | |
ace68bac | 996 | goto out_reserve; |
b9aa55be | 997 | } |
e6dcd2dc | 998 | em->start = start; |
445a6944 | 999 | em->orig_start = em->start; |
771ed689 CM |
1000 | ram_size = ins.offset; |
1001 | em->len = ins.offset; | |
2ab28f32 JB |
1002 | em->mod_start = em->start; |
1003 | em->mod_len = em->len; | |
c8b97818 | 1004 | |
e6dcd2dc | 1005 | em->block_start = ins.objectid; |
c8b97818 | 1006 | em->block_len = ins.offset; |
b4939680 | 1007 | em->orig_block_len = ins.offset; |
cc95bef6 | 1008 | em->ram_bytes = ram_size; |
e6dcd2dc | 1009 | em->bdev = root->fs_info->fs_devices->latest_bdev; |
7f3c74fb | 1010 | set_bit(EXTENT_FLAG_PINNED, &em->flags); |
70c8a91c | 1011 | em->generation = -1; |
c8b97818 | 1012 | |
d397712b | 1013 | while (1) { |
890871be | 1014 | write_lock(&em_tree->lock); |
09a2a8f9 | 1015 | ret = add_extent_mapping(em_tree, em, 1); |
890871be | 1016 | write_unlock(&em_tree->lock); |
e6dcd2dc CM |
1017 | if (ret != -EEXIST) { |
1018 | free_extent_map(em); | |
1019 | break; | |
1020 | } | |
1021 | btrfs_drop_extent_cache(inode, start, | |
c8b97818 | 1022 | start + ram_size - 1, 0); |
e6dcd2dc | 1023 | } |
ace68bac LB |
1024 | if (ret) |
1025 | goto out_reserve; | |
e6dcd2dc | 1026 | |
98d20f67 | 1027 | cur_alloc_size = ins.offset; |
e6dcd2dc | 1028 | ret = btrfs_add_ordered_extent(inode, start, ins.objectid, |
771ed689 | 1029 | ram_size, cur_alloc_size, 0); |
ace68bac | 1030 | if (ret) |
d9f85963 | 1031 | goto out_drop_extent_cache; |
c8b97818 | 1032 | |
17d217fe YZ |
1033 | if (root->root_key.objectid == |
1034 | BTRFS_DATA_RELOC_TREE_OBJECTID) { | |
1035 | ret = btrfs_reloc_clone_csums(inode, start, | |
1036 | cur_alloc_size); | |
00361589 | 1037 | if (ret) |
d9f85963 | 1038 | goto out_drop_extent_cache; |
17d217fe YZ |
1039 | } |
1040 | ||
d397712b | 1041 | if (disk_num_bytes < cur_alloc_size) |
3b951516 | 1042 | break; |
d397712b | 1043 | |
c8b97818 CM |
1044 | /* we're not doing compressed IO, don't unlock the first |
1045 | * page (which the caller expects to stay locked), don't | |
1046 | * clear any dirty bits and don't set any writeback bits | |
8b62b72b CM |
1047 | * |
1048 | * Do set the Private2 bit so we know this page was properly | |
1049 | * setup for writepage | |
c8b97818 | 1050 | */ |
c2790a2e JB |
1051 | op = unlock ? PAGE_UNLOCK : 0; |
1052 | op |= PAGE_SET_PRIVATE2; | |
a791e35e | 1053 | |
c2790a2e JB |
1054 | extent_clear_unlock_delalloc(inode, start, |
1055 | start + ram_size - 1, locked_page, | |
1056 | EXTENT_LOCKED | EXTENT_DELALLOC, | |
1057 | op); | |
c8b97818 | 1058 | disk_num_bytes -= cur_alloc_size; |
c59f8951 CM |
1059 | num_bytes -= cur_alloc_size; |
1060 | alloc_hint = ins.objectid + ins.offset; | |
1061 | start += cur_alloc_size; | |
b888db2b | 1062 | } |
79787eaa | 1063 | out: |
be20aa9d | 1064 | return ret; |
b7d5b0a8 | 1065 | |
d9f85963 FM |
1066 | out_drop_extent_cache: |
1067 | btrfs_drop_extent_cache(inode, start, start + ram_size - 1, 0); | |
ace68bac | 1068 | out_reserve: |
e570fd27 | 1069 | btrfs_free_reserved_extent(root, ins.objectid, ins.offset, 1); |
79787eaa | 1070 | out_unlock: |
c2790a2e | 1071 | extent_clear_unlock_delalloc(inode, start, end, locked_page, |
151a41bc JB |
1072 | EXTENT_LOCKED | EXTENT_DO_ACCOUNTING | |
1073 | EXTENT_DELALLOC | EXTENT_DEFRAG, | |
1074 | PAGE_UNLOCK | PAGE_CLEAR_DIRTY | | |
1075 | PAGE_SET_WRITEBACK | PAGE_END_WRITEBACK); | |
79787eaa | 1076 | goto out; |
771ed689 | 1077 | } |
c8b97818 | 1078 | |
771ed689 CM |
1079 | /* |
1080 | * work queue call back to started compression on a file and pages | |
1081 | */ | |
1082 | static noinline void async_cow_start(struct btrfs_work *work) | |
1083 | { | |
1084 | struct async_cow *async_cow; | |
1085 | int num_added = 0; | |
1086 | async_cow = container_of(work, struct async_cow, work); | |
1087 | ||
1088 | compress_file_range(async_cow->inode, async_cow->locked_page, | |
1089 | async_cow->start, async_cow->end, async_cow, | |
1090 | &num_added); | |
8180ef88 | 1091 | if (num_added == 0) { |
cb77fcd8 | 1092 | btrfs_add_delayed_iput(async_cow->inode); |
771ed689 | 1093 | async_cow->inode = NULL; |
8180ef88 | 1094 | } |
771ed689 CM |
1095 | } |
1096 | ||
1097 | /* | |
1098 | * work queue call back to submit previously compressed pages | |
1099 | */ | |
1100 | static noinline void async_cow_submit(struct btrfs_work *work) | |
1101 | { | |
1102 | struct async_cow *async_cow; | |
1103 | struct btrfs_root *root; | |
1104 | unsigned long nr_pages; | |
1105 | ||
1106 | async_cow = container_of(work, struct async_cow, work); | |
1107 | ||
1108 | root = async_cow->root; | |
1109 | nr_pages = (async_cow->end - async_cow->start + PAGE_CACHE_SIZE) >> | |
1110 | PAGE_CACHE_SHIFT; | |
1111 | ||
ee863954 DS |
1112 | /* |
1113 | * atomic_sub_return implies a barrier for waitqueue_active | |
1114 | */ | |
66657b31 | 1115 | if (atomic_sub_return(nr_pages, &root->fs_info->async_delalloc_pages) < |
ee22184b | 1116 | 5 * SZ_1M && |
771ed689 CM |
1117 | waitqueue_active(&root->fs_info->async_submit_wait)) |
1118 | wake_up(&root->fs_info->async_submit_wait); | |
1119 | ||
d397712b | 1120 | if (async_cow->inode) |
771ed689 | 1121 | submit_compressed_extents(async_cow->inode, async_cow); |
771ed689 | 1122 | } |
c8b97818 | 1123 | |
771ed689 CM |
1124 | static noinline void async_cow_free(struct btrfs_work *work) |
1125 | { | |
1126 | struct async_cow *async_cow; | |
1127 | async_cow = container_of(work, struct async_cow, work); | |
8180ef88 | 1128 | if (async_cow->inode) |
cb77fcd8 | 1129 | btrfs_add_delayed_iput(async_cow->inode); |
771ed689 CM |
1130 | kfree(async_cow); |
1131 | } | |
1132 | ||
1133 | static int cow_file_range_async(struct inode *inode, struct page *locked_page, | |
1134 | u64 start, u64 end, int *page_started, | |
1135 | unsigned long *nr_written) | |
1136 | { | |
1137 | struct async_cow *async_cow; | |
1138 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
1139 | unsigned long nr_pages; | |
1140 | u64 cur_end; | |
ee22184b | 1141 | int limit = 10 * SZ_1M; |
771ed689 | 1142 | |
a3429ab7 CM |
1143 | clear_extent_bit(&BTRFS_I(inode)->io_tree, start, end, EXTENT_LOCKED, |
1144 | 1, 0, NULL, GFP_NOFS); | |
d397712b | 1145 | while (start < end) { |
771ed689 | 1146 | async_cow = kmalloc(sizeof(*async_cow), GFP_NOFS); |
79787eaa | 1147 | BUG_ON(!async_cow); /* -ENOMEM */ |
8180ef88 | 1148 | async_cow->inode = igrab(inode); |
771ed689 CM |
1149 | async_cow->root = root; |
1150 | async_cow->locked_page = locked_page; | |
1151 | async_cow->start = start; | |
1152 | ||
f79707b0 WS |
1153 | if (BTRFS_I(inode)->flags & BTRFS_INODE_NOCOMPRESS && |
1154 | !btrfs_test_opt(root, FORCE_COMPRESS)) | |
771ed689 CM |
1155 | cur_end = end; |
1156 | else | |
ee22184b | 1157 | cur_end = min(end, start + SZ_512K - 1); |
771ed689 CM |
1158 | |
1159 | async_cow->end = cur_end; | |
1160 | INIT_LIST_HEAD(&async_cow->extents); | |
1161 | ||
9e0af237 LB |
1162 | btrfs_init_work(&async_cow->work, |
1163 | btrfs_delalloc_helper, | |
1164 | async_cow_start, async_cow_submit, | |
1165 | async_cow_free); | |
771ed689 | 1166 | |
771ed689 CM |
1167 | nr_pages = (cur_end - start + PAGE_CACHE_SIZE) >> |
1168 | PAGE_CACHE_SHIFT; | |
1169 | atomic_add(nr_pages, &root->fs_info->async_delalloc_pages); | |
1170 | ||
afe3d242 QW |
1171 | btrfs_queue_work(root->fs_info->delalloc_workers, |
1172 | &async_cow->work); | |
771ed689 CM |
1173 | |
1174 | if (atomic_read(&root->fs_info->async_delalloc_pages) > limit) { | |
1175 | wait_event(root->fs_info->async_submit_wait, | |
1176 | (atomic_read(&root->fs_info->async_delalloc_pages) < | |
1177 | limit)); | |
1178 | } | |
1179 | ||
d397712b | 1180 | while (atomic_read(&root->fs_info->async_submit_draining) && |
771ed689 CM |
1181 | atomic_read(&root->fs_info->async_delalloc_pages)) { |
1182 | wait_event(root->fs_info->async_submit_wait, | |
1183 | (atomic_read(&root->fs_info->async_delalloc_pages) == | |
1184 | 0)); | |
1185 | } | |
1186 | ||
1187 | *nr_written += nr_pages; | |
1188 | start = cur_end + 1; | |
1189 | } | |
1190 | *page_started = 1; | |
1191 | return 0; | |
be20aa9d CM |
1192 | } |
1193 | ||
d397712b | 1194 | static noinline int csum_exist_in_range(struct btrfs_root *root, |
17d217fe YZ |
1195 | u64 bytenr, u64 num_bytes) |
1196 | { | |
1197 | int ret; | |
1198 | struct btrfs_ordered_sum *sums; | |
1199 | LIST_HEAD(list); | |
1200 | ||
07d400a6 | 1201 | ret = btrfs_lookup_csums_range(root->fs_info->csum_root, bytenr, |
a2de733c | 1202 | bytenr + num_bytes - 1, &list, 0); |
17d217fe YZ |
1203 | if (ret == 0 && list_empty(&list)) |
1204 | return 0; | |
1205 | ||
1206 | while (!list_empty(&list)) { | |
1207 | sums = list_entry(list.next, struct btrfs_ordered_sum, list); | |
1208 | list_del(&sums->list); | |
1209 | kfree(sums); | |
1210 | } | |
1211 | return 1; | |
1212 | } | |
1213 | ||
d352ac68 CM |
1214 | /* |
1215 | * when nowcow writeback call back. This checks for snapshots or COW copies | |
1216 | * of the extents that exist in the file, and COWs the file as required. | |
1217 | * | |
1218 | * If no cow copies or snapshots exist, we write directly to the existing | |
1219 | * blocks on disk | |
1220 | */ | |
7f366cfe CM |
1221 | static noinline int run_delalloc_nocow(struct inode *inode, |
1222 | struct page *locked_page, | |
771ed689 CM |
1223 | u64 start, u64 end, int *page_started, int force, |
1224 | unsigned long *nr_written) | |
be20aa9d | 1225 | { |
be20aa9d | 1226 | struct btrfs_root *root = BTRFS_I(inode)->root; |
7ea394f1 | 1227 | struct btrfs_trans_handle *trans; |
be20aa9d | 1228 | struct extent_buffer *leaf; |
be20aa9d | 1229 | struct btrfs_path *path; |
80ff3856 | 1230 | struct btrfs_file_extent_item *fi; |
be20aa9d | 1231 | struct btrfs_key found_key; |
80ff3856 YZ |
1232 | u64 cow_start; |
1233 | u64 cur_offset; | |
1234 | u64 extent_end; | |
5d4f98a2 | 1235 | u64 extent_offset; |
80ff3856 YZ |
1236 | u64 disk_bytenr; |
1237 | u64 num_bytes; | |
b4939680 | 1238 | u64 disk_num_bytes; |
cc95bef6 | 1239 | u64 ram_bytes; |
80ff3856 | 1240 | int extent_type; |
79787eaa | 1241 | int ret, err; |
d899e052 | 1242 | int type; |
80ff3856 YZ |
1243 | int nocow; |
1244 | int check_prev = 1; | |
82d5902d | 1245 | bool nolock; |
33345d01 | 1246 | u64 ino = btrfs_ino(inode); |
be20aa9d CM |
1247 | |
1248 | path = btrfs_alloc_path(); | |
17ca04af | 1249 | if (!path) { |
c2790a2e JB |
1250 | extent_clear_unlock_delalloc(inode, start, end, locked_page, |
1251 | EXTENT_LOCKED | EXTENT_DELALLOC | | |
151a41bc JB |
1252 | EXTENT_DO_ACCOUNTING | |
1253 | EXTENT_DEFRAG, PAGE_UNLOCK | | |
c2790a2e JB |
1254 | PAGE_CLEAR_DIRTY | |
1255 | PAGE_SET_WRITEBACK | | |
1256 | PAGE_END_WRITEBACK); | |
d8926bb3 | 1257 | return -ENOMEM; |
17ca04af | 1258 | } |
82d5902d | 1259 | |
83eea1f1 | 1260 | nolock = btrfs_is_free_space_inode(inode); |
82d5902d LZ |
1261 | |
1262 | if (nolock) | |
7a7eaa40 | 1263 | trans = btrfs_join_transaction_nolock(root); |
82d5902d | 1264 | else |
7a7eaa40 | 1265 | trans = btrfs_join_transaction(root); |
ff5714cc | 1266 | |
79787eaa | 1267 | if (IS_ERR(trans)) { |
c2790a2e JB |
1268 | extent_clear_unlock_delalloc(inode, start, end, locked_page, |
1269 | EXTENT_LOCKED | EXTENT_DELALLOC | | |
151a41bc JB |
1270 | EXTENT_DO_ACCOUNTING | |
1271 | EXTENT_DEFRAG, PAGE_UNLOCK | | |
c2790a2e JB |
1272 | PAGE_CLEAR_DIRTY | |
1273 | PAGE_SET_WRITEBACK | | |
1274 | PAGE_END_WRITEBACK); | |
79787eaa JM |
1275 | btrfs_free_path(path); |
1276 | return PTR_ERR(trans); | |
1277 | } | |
1278 | ||
74b21075 | 1279 | trans->block_rsv = &root->fs_info->delalloc_block_rsv; |
be20aa9d | 1280 | |
80ff3856 YZ |
1281 | cow_start = (u64)-1; |
1282 | cur_offset = start; | |
1283 | while (1) { | |
33345d01 | 1284 | ret = btrfs_lookup_file_extent(trans, root, path, ino, |
80ff3856 | 1285 | cur_offset, 0); |
d788a349 | 1286 | if (ret < 0) |
79787eaa | 1287 | goto error; |
80ff3856 YZ |
1288 | if (ret > 0 && path->slots[0] > 0 && check_prev) { |
1289 | leaf = path->nodes[0]; | |
1290 | btrfs_item_key_to_cpu(leaf, &found_key, | |
1291 | path->slots[0] - 1); | |
33345d01 | 1292 | if (found_key.objectid == ino && |
80ff3856 YZ |
1293 | found_key.type == BTRFS_EXTENT_DATA_KEY) |
1294 | path->slots[0]--; | |
1295 | } | |
1296 | check_prev = 0; | |
1297 | next_slot: | |
1298 | leaf = path->nodes[0]; | |
1299 | if (path->slots[0] >= btrfs_header_nritems(leaf)) { | |
1300 | ret = btrfs_next_leaf(root, path); | |
d788a349 | 1301 | if (ret < 0) |
79787eaa | 1302 | goto error; |
80ff3856 YZ |
1303 | if (ret > 0) |
1304 | break; | |
1305 | leaf = path->nodes[0]; | |
1306 | } | |
be20aa9d | 1307 | |
80ff3856 YZ |
1308 | nocow = 0; |
1309 | disk_bytenr = 0; | |
17d217fe | 1310 | num_bytes = 0; |
80ff3856 YZ |
1311 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); |
1312 | ||
1d512cb7 FM |
1313 | if (found_key.objectid > ino) |
1314 | break; | |
1315 | if (WARN_ON_ONCE(found_key.objectid < ino) || | |
1316 | found_key.type < BTRFS_EXTENT_DATA_KEY) { | |
1317 | path->slots[0]++; | |
1318 | goto next_slot; | |
1319 | } | |
1320 | if (found_key.type > BTRFS_EXTENT_DATA_KEY || | |
80ff3856 YZ |
1321 | found_key.offset > end) |
1322 | break; | |
1323 | ||
1324 | if (found_key.offset > cur_offset) { | |
1325 | extent_end = found_key.offset; | |
e9061e21 | 1326 | extent_type = 0; |
80ff3856 YZ |
1327 | goto out_check; |
1328 | } | |
1329 | ||
1330 | fi = btrfs_item_ptr(leaf, path->slots[0], | |
1331 | struct btrfs_file_extent_item); | |
1332 | extent_type = btrfs_file_extent_type(leaf, fi); | |
1333 | ||
cc95bef6 | 1334 | ram_bytes = btrfs_file_extent_ram_bytes(leaf, fi); |
d899e052 YZ |
1335 | if (extent_type == BTRFS_FILE_EXTENT_REG || |
1336 | extent_type == BTRFS_FILE_EXTENT_PREALLOC) { | |
80ff3856 | 1337 | disk_bytenr = btrfs_file_extent_disk_bytenr(leaf, fi); |
5d4f98a2 | 1338 | extent_offset = btrfs_file_extent_offset(leaf, fi); |
80ff3856 YZ |
1339 | extent_end = found_key.offset + |
1340 | btrfs_file_extent_num_bytes(leaf, fi); | |
b4939680 JB |
1341 | disk_num_bytes = |
1342 | btrfs_file_extent_disk_num_bytes(leaf, fi); | |
80ff3856 YZ |
1343 | if (extent_end <= start) { |
1344 | path->slots[0]++; | |
1345 | goto next_slot; | |
1346 | } | |
17d217fe YZ |
1347 | if (disk_bytenr == 0) |
1348 | goto out_check; | |
80ff3856 YZ |
1349 | if (btrfs_file_extent_compression(leaf, fi) || |
1350 | btrfs_file_extent_encryption(leaf, fi) || | |
1351 | btrfs_file_extent_other_encoding(leaf, fi)) | |
1352 | goto out_check; | |
d899e052 YZ |
1353 | if (extent_type == BTRFS_FILE_EXTENT_REG && !force) |
1354 | goto out_check; | |
d2fb3437 | 1355 | if (btrfs_extent_readonly(root, disk_bytenr)) |
80ff3856 | 1356 | goto out_check; |
33345d01 | 1357 | if (btrfs_cross_ref_exist(trans, root, ino, |
5d4f98a2 YZ |
1358 | found_key.offset - |
1359 | extent_offset, disk_bytenr)) | |
17d217fe | 1360 | goto out_check; |
5d4f98a2 | 1361 | disk_bytenr += extent_offset; |
17d217fe YZ |
1362 | disk_bytenr += cur_offset - found_key.offset; |
1363 | num_bytes = min(end + 1, extent_end) - cur_offset; | |
e9894fd3 WS |
1364 | /* |
1365 | * if there are pending snapshots for this root, | |
1366 | * we fall into common COW way. | |
1367 | */ | |
1368 | if (!nolock) { | |
9ea24bbe | 1369 | err = btrfs_start_write_no_snapshoting(root); |
e9894fd3 WS |
1370 | if (!err) |
1371 | goto out_check; | |
1372 | } | |
17d217fe YZ |
1373 | /* |
1374 | * force cow if csum exists in the range. | |
1375 | * this ensure that csum for a given extent are | |
1376 | * either valid or do not exist. | |
1377 | */ | |
1378 | if (csum_exist_in_range(root, disk_bytenr, num_bytes)) | |
1379 | goto out_check; | |
80ff3856 YZ |
1380 | nocow = 1; |
1381 | } else if (extent_type == BTRFS_FILE_EXTENT_INLINE) { | |
1382 | extent_end = found_key.offset + | |
514ac8ad CM |
1383 | btrfs_file_extent_inline_len(leaf, |
1384 | path->slots[0], fi); | |
80ff3856 YZ |
1385 | extent_end = ALIGN(extent_end, root->sectorsize); |
1386 | } else { | |
1387 | BUG_ON(1); | |
1388 | } | |
1389 | out_check: | |
1390 | if (extent_end <= start) { | |
1391 | path->slots[0]++; | |
e9894fd3 | 1392 | if (!nolock && nocow) |
9ea24bbe | 1393 | btrfs_end_write_no_snapshoting(root); |
80ff3856 YZ |
1394 | goto next_slot; |
1395 | } | |
1396 | if (!nocow) { | |
1397 | if (cow_start == (u64)-1) | |
1398 | cow_start = cur_offset; | |
1399 | cur_offset = extent_end; | |
1400 | if (cur_offset > end) | |
1401 | break; | |
1402 | path->slots[0]++; | |
1403 | goto next_slot; | |
7ea394f1 YZ |
1404 | } |
1405 | ||
b3b4aa74 | 1406 | btrfs_release_path(path); |
80ff3856 | 1407 | if (cow_start != (u64)-1) { |
00361589 JB |
1408 | ret = cow_file_range(inode, locked_page, |
1409 | cow_start, found_key.offset - 1, | |
1410 | page_started, nr_written, 1); | |
e9894fd3 WS |
1411 | if (ret) { |
1412 | if (!nolock && nocow) | |
9ea24bbe | 1413 | btrfs_end_write_no_snapshoting(root); |
79787eaa | 1414 | goto error; |
e9894fd3 | 1415 | } |
80ff3856 | 1416 | cow_start = (u64)-1; |
7ea394f1 | 1417 | } |
80ff3856 | 1418 | |
d899e052 YZ |
1419 | if (extent_type == BTRFS_FILE_EXTENT_PREALLOC) { |
1420 | struct extent_map *em; | |
1421 | struct extent_map_tree *em_tree; | |
1422 | em_tree = &BTRFS_I(inode)->extent_tree; | |
172ddd60 | 1423 | em = alloc_extent_map(); |
79787eaa | 1424 | BUG_ON(!em); /* -ENOMEM */ |
d899e052 | 1425 | em->start = cur_offset; |
70c8a91c | 1426 | em->orig_start = found_key.offset - extent_offset; |
d899e052 YZ |
1427 | em->len = num_bytes; |
1428 | em->block_len = num_bytes; | |
1429 | em->block_start = disk_bytenr; | |
b4939680 | 1430 | em->orig_block_len = disk_num_bytes; |
cc95bef6 | 1431 | em->ram_bytes = ram_bytes; |
d899e052 | 1432 | em->bdev = root->fs_info->fs_devices->latest_bdev; |
2ab28f32 JB |
1433 | em->mod_start = em->start; |
1434 | em->mod_len = em->len; | |
d899e052 | 1435 | set_bit(EXTENT_FLAG_PINNED, &em->flags); |
b11e234d | 1436 | set_bit(EXTENT_FLAG_FILLING, &em->flags); |
70c8a91c | 1437 | em->generation = -1; |
d899e052 | 1438 | while (1) { |
890871be | 1439 | write_lock(&em_tree->lock); |
09a2a8f9 | 1440 | ret = add_extent_mapping(em_tree, em, 1); |
890871be | 1441 | write_unlock(&em_tree->lock); |
d899e052 YZ |
1442 | if (ret != -EEXIST) { |
1443 | free_extent_map(em); | |
1444 | break; | |
1445 | } | |
1446 | btrfs_drop_extent_cache(inode, em->start, | |
1447 | em->start + em->len - 1, 0); | |
1448 | } | |
1449 | type = BTRFS_ORDERED_PREALLOC; | |
1450 | } else { | |
1451 | type = BTRFS_ORDERED_NOCOW; | |
1452 | } | |
80ff3856 YZ |
1453 | |
1454 | ret = btrfs_add_ordered_extent(inode, cur_offset, disk_bytenr, | |
d899e052 | 1455 | num_bytes, num_bytes, type); |
79787eaa | 1456 | BUG_ON(ret); /* -ENOMEM */ |
771ed689 | 1457 | |
efa56464 YZ |
1458 | if (root->root_key.objectid == |
1459 | BTRFS_DATA_RELOC_TREE_OBJECTID) { | |
1460 | ret = btrfs_reloc_clone_csums(inode, cur_offset, | |
1461 | num_bytes); | |
e9894fd3 WS |
1462 | if (ret) { |
1463 | if (!nolock && nocow) | |
9ea24bbe | 1464 | btrfs_end_write_no_snapshoting(root); |
79787eaa | 1465 | goto error; |
e9894fd3 | 1466 | } |
efa56464 YZ |
1467 | } |
1468 | ||
c2790a2e JB |
1469 | extent_clear_unlock_delalloc(inode, cur_offset, |
1470 | cur_offset + num_bytes - 1, | |
1471 | locked_page, EXTENT_LOCKED | | |
1472 | EXTENT_DELALLOC, PAGE_UNLOCK | | |
1473 | PAGE_SET_PRIVATE2); | |
e9894fd3 | 1474 | if (!nolock && nocow) |
9ea24bbe | 1475 | btrfs_end_write_no_snapshoting(root); |
80ff3856 YZ |
1476 | cur_offset = extent_end; |
1477 | if (cur_offset > end) | |
1478 | break; | |
be20aa9d | 1479 | } |
b3b4aa74 | 1480 | btrfs_release_path(path); |
80ff3856 | 1481 | |
17ca04af | 1482 | if (cur_offset <= end && cow_start == (u64)-1) { |
80ff3856 | 1483 | cow_start = cur_offset; |
17ca04af JB |
1484 | cur_offset = end; |
1485 | } | |
1486 | ||
80ff3856 | 1487 | if (cow_start != (u64)-1) { |
00361589 JB |
1488 | ret = cow_file_range(inode, locked_page, cow_start, end, |
1489 | page_started, nr_written, 1); | |
d788a349 | 1490 | if (ret) |
79787eaa | 1491 | goto error; |
80ff3856 YZ |
1492 | } |
1493 | ||
79787eaa | 1494 | error: |
a698d075 | 1495 | err = btrfs_end_transaction(trans, root); |
79787eaa JM |
1496 | if (!ret) |
1497 | ret = err; | |
1498 | ||
17ca04af | 1499 | if (ret && cur_offset < end) |
c2790a2e JB |
1500 | extent_clear_unlock_delalloc(inode, cur_offset, end, |
1501 | locked_page, EXTENT_LOCKED | | |
151a41bc JB |
1502 | EXTENT_DELALLOC | EXTENT_DEFRAG | |
1503 | EXTENT_DO_ACCOUNTING, PAGE_UNLOCK | | |
1504 | PAGE_CLEAR_DIRTY | | |
c2790a2e JB |
1505 | PAGE_SET_WRITEBACK | |
1506 | PAGE_END_WRITEBACK); | |
7ea394f1 | 1507 | btrfs_free_path(path); |
79787eaa | 1508 | return ret; |
be20aa9d CM |
1509 | } |
1510 | ||
47059d93 WS |
1511 | static inline int need_force_cow(struct inode *inode, u64 start, u64 end) |
1512 | { | |
1513 | ||
1514 | if (!(BTRFS_I(inode)->flags & BTRFS_INODE_NODATACOW) && | |
1515 | !(BTRFS_I(inode)->flags & BTRFS_INODE_PREALLOC)) | |
1516 | return 0; | |
1517 | ||
1518 | /* | |
1519 | * @defrag_bytes is a hint value, no spinlock held here, | |
1520 | * if is not zero, it means the file is defragging. | |
1521 | * Force cow if given extent needs to be defragged. | |
1522 | */ | |
1523 | if (BTRFS_I(inode)->defrag_bytes && | |
1524 | test_range_bit(&BTRFS_I(inode)->io_tree, start, end, | |
1525 | EXTENT_DEFRAG, 0, NULL)) | |
1526 | return 1; | |
1527 | ||
1528 | return 0; | |
1529 | } | |
1530 | ||
d352ac68 CM |
1531 | /* |
1532 | * extent_io.c call back to do delayed allocation processing | |
1533 | */ | |
c8b97818 | 1534 | static int run_delalloc_range(struct inode *inode, struct page *locked_page, |
771ed689 CM |
1535 | u64 start, u64 end, int *page_started, |
1536 | unsigned long *nr_written) | |
be20aa9d | 1537 | { |
be20aa9d | 1538 | int ret; |
47059d93 | 1539 | int force_cow = need_force_cow(inode, start, end); |
a2135011 | 1540 | |
47059d93 | 1541 | if (BTRFS_I(inode)->flags & BTRFS_INODE_NODATACOW && !force_cow) { |
c8b97818 | 1542 | ret = run_delalloc_nocow(inode, locked_page, start, end, |
d397712b | 1543 | page_started, 1, nr_written); |
47059d93 | 1544 | } else if (BTRFS_I(inode)->flags & BTRFS_INODE_PREALLOC && !force_cow) { |
d899e052 | 1545 | ret = run_delalloc_nocow(inode, locked_page, start, end, |
d397712b | 1546 | page_started, 0, nr_written); |
7816030e | 1547 | } else if (!inode_need_compress(inode)) { |
7f366cfe CM |
1548 | ret = cow_file_range(inode, locked_page, start, end, |
1549 | page_started, nr_written, 1); | |
7ddf5a42 JB |
1550 | } else { |
1551 | set_bit(BTRFS_INODE_HAS_ASYNC_EXTENT, | |
1552 | &BTRFS_I(inode)->runtime_flags); | |
771ed689 | 1553 | ret = cow_file_range_async(inode, locked_page, start, end, |
d397712b | 1554 | page_started, nr_written); |
7ddf5a42 | 1555 | } |
b888db2b CM |
1556 | return ret; |
1557 | } | |
1558 | ||
1bf85046 JM |
1559 | static void btrfs_split_extent_hook(struct inode *inode, |
1560 | struct extent_state *orig, u64 split) | |
9ed74f2d | 1561 | { |
dcab6a3b JB |
1562 | u64 size; |
1563 | ||
0ca1f7ce | 1564 | /* not delalloc, ignore it */ |
9ed74f2d | 1565 | if (!(orig->state & EXTENT_DELALLOC)) |
1bf85046 | 1566 | return; |
9ed74f2d | 1567 | |
dcab6a3b JB |
1568 | size = orig->end - orig->start + 1; |
1569 | if (size > BTRFS_MAX_EXTENT_SIZE) { | |
1570 | u64 num_extents; | |
1571 | u64 new_size; | |
1572 | ||
1573 | /* | |
ba117213 JB |
1574 | * See the explanation in btrfs_merge_extent_hook, the same |
1575 | * applies here, just in reverse. | |
dcab6a3b JB |
1576 | */ |
1577 | new_size = orig->end - split + 1; | |
ba117213 | 1578 | num_extents = div64_u64(new_size + BTRFS_MAX_EXTENT_SIZE - 1, |
dcab6a3b | 1579 | BTRFS_MAX_EXTENT_SIZE); |
ba117213 JB |
1580 | new_size = split - orig->start; |
1581 | num_extents += div64_u64(new_size + BTRFS_MAX_EXTENT_SIZE - 1, | |
1582 | BTRFS_MAX_EXTENT_SIZE); | |
1583 | if (div64_u64(size + BTRFS_MAX_EXTENT_SIZE - 1, | |
1584 | BTRFS_MAX_EXTENT_SIZE) >= num_extents) | |
dcab6a3b JB |
1585 | return; |
1586 | } | |
1587 | ||
9e0baf60 JB |
1588 | spin_lock(&BTRFS_I(inode)->lock); |
1589 | BTRFS_I(inode)->outstanding_extents++; | |
1590 | spin_unlock(&BTRFS_I(inode)->lock); | |
9ed74f2d JB |
1591 | } |
1592 | ||
1593 | /* | |
1594 | * extent_io.c merge_extent_hook, used to track merged delayed allocation | |
1595 | * extents so we can keep track of new extents that are just merged onto old | |
1596 | * extents, such as when we are doing sequential writes, so we can properly | |
1597 | * account for the metadata space we'll need. | |
1598 | */ | |
1bf85046 JM |
1599 | static void btrfs_merge_extent_hook(struct inode *inode, |
1600 | struct extent_state *new, | |
1601 | struct extent_state *other) | |
9ed74f2d | 1602 | { |
dcab6a3b JB |
1603 | u64 new_size, old_size; |
1604 | u64 num_extents; | |
1605 | ||
9ed74f2d JB |
1606 | /* not delalloc, ignore it */ |
1607 | if (!(other->state & EXTENT_DELALLOC)) | |
1bf85046 | 1608 | return; |
9ed74f2d | 1609 | |
8461a3de JB |
1610 | if (new->start > other->start) |
1611 | new_size = new->end - other->start + 1; | |
1612 | else | |
1613 | new_size = other->end - new->start + 1; | |
dcab6a3b JB |
1614 | |
1615 | /* we're not bigger than the max, unreserve the space and go */ | |
1616 | if (new_size <= BTRFS_MAX_EXTENT_SIZE) { | |
1617 | spin_lock(&BTRFS_I(inode)->lock); | |
1618 | BTRFS_I(inode)->outstanding_extents--; | |
1619 | spin_unlock(&BTRFS_I(inode)->lock); | |
1620 | return; | |
1621 | } | |
1622 | ||
1623 | /* | |
ba117213 JB |
1624 | * We have to add up either side to figure out how many extents were |
1625 | * accounted for before we merged into one big extent. If the number of | |
1626 | * extents we accounted for is <= the amount we need for the new range | |
1627 | * then we can return, otherwise drop. Think of it like this | |
1628 | * | |
1629 | * [ 4k][MAX_SIZE] | |
1630 | * | |
1631 | * So we've grown the extent by a MAX_SIZE extent, this would mean we | |
1632 | * need 2 outstanding extents, on one side we have 1 and the other side | |
1633 | * we have 1 so they are == and we can return. But in this case | |
1634 | * | |
1635 | * [MAX_SIZE+4k][MAX_SIZE+4k] | |
1636 | * | |
1637 | * Each range on their own accounts for 2 extents, but merged together | |
1638 | * they are only 3 extents worth of accounting, so we need to drop in | |
1639 | * this case. | |
dcab6a3b | 1640 | */ |
ba117213 | 1641 | old_size = other->end - other->start + 1; |
dcab6a3b JB |
1642 | num_extents = div64_u64(old_size + BTRFS_MAX_EXTENT_SIZE - 1, |
1643 | BTRFS_MAX_EXTENT_SIZE); | |
ba117213 JB |
1644 | old_size = new->end - new->start + 1; |
1645 | num_extents += div64_u64(old_size + BTRFS_MAX_EXTENT_SIZE - 1, | |
1646 | BTRFS_MAX_EXTENT_SIZE); | |
1647 | ||
dcab6a3b | 1648 | if (div64_u64(new_size + BTRFS_MAX_EXTENT_SIZE - 1, |
ba117213 | 1649 | BTRFS_MAX_EXTENT_SIZE) >= num_extents) |
dcab6a3b JB |
1650 | return; |
1651 | ||
9e0baf60 JB |
1652 | spin_lock(&BTRFS_I(inode)->lock); |
1653 | BTRFS_I(inode)->outstanding_extents--; | |
1654 | spin_unlock(&BTRFS_I(inode)->lock); | |
9ed74f2d JB |
1655 | } |
1656 | ||
eb73c1b7 MX |
1657 | static void btrfs_add_delalloc_inodes(struct btrfs_root *root, |
1658 | struct inode *inode) | |
1659 | { | |
1660 | spin_lock(&root->delalloc_lock); | |
1661 | if (list_empty(&BTRFS_I(inode)->delalloc_inodes)) { | |
1662 | list_add_tail(&BTRFS_I(inode)->delalloc_inodes, | |
1663 | &root->delalloc_inodes); | |
1664 | set_bit(BTRFS_INODE_IN_DELALLOC_LIST, | |
1665 | &BTRFS_I(inode)->runtime_flags); | |
1666 | root->nr_delalloc_inodes++; | |
1667 | if (root->nr_delalloc_inodes == 1) { | |
1668 | spin_lock(&root->fs_info->delalloc_root_lock); | |
1669 | BUG_ON(!list_empty(&root->delalloc_root)); | |
1670 | list_add_tail(&root->delalloc_root, | |
1671 | &root->fs_info->delalloc_roots); | |
1672 | spin_unlock(&root->fs_info->delalloc_root_lock); | |
1673 | } | |
1674 | } | |
1675 | spin_unlock(&root->delalloc_lock); | |
1676 | } | |
1677 | ||
1678 | static void btrfs_del_delalloc_inode(struct btrfs_root *root, | |
1679 | struct inode *inode) | |
1680 | { | |
1681 | spin_lock(&root->delalloc_lock); | |
1682 | if (!list_empty(&BTRFS_I(inode)->delalloc_inodes)) { | |
1683 | list_del_init(&BTRFS_I(inode)->delalloc_inodes); | |
1684 | clear_bit(BTRFS_INODE_IN_DELALLOC_LIST, | |
1685 | &BTRFS_I(inode)->runtime_flags); | |
1686 | root->nr_delalloc_inodes--; | |
1687 | if (!root->nr_delalloc_inodes) { | |
1688 | spin_lock(&root->fs_info->delalloc_root_lock); | |
1689 | BUG_ON(list_empty(&root->delalloc_root)); | |
1690 | list_del_init(&root->delalloc_root); | |
1691 | spin_unlock(&root->fs_info->delalloc_root_lock); | |
1692 | } | |
1693 | } | |
1694 | spin_unlock(&root->delalloc_lock); | |
1695 | } | |
1696 | ||
d352ac68 CM |
1697 | /* |
1698 | * extent_io.c set_bit_hook, used to track delayed allocation | |
1699 | * bytes in this file, and to maintain the list of inodes that | |
1700 | * have pending delalloc work to be done. | |
1701 | */ | |
1bf85046 | 1702 | static void btrfs_set_bit_hook(struct inode *inode, |
9ee49a04 | 1703 | struct extent_state *state, unsigned *bits) |
291d673e | 1704 | { |
9ed74f2d | 1705 | |
47059d93 WS |
1706 | if ((*bits & EXTENT_DEFRAG) && !(*bits & EXTENT_DELALLOC)) |
1707 | WARN_ON(1); | |
75eff68e CM |
1708 | /* |
1709 | * set_bit and clear bit hooks normally require _irqsave/restore | |
27160b6b | 1710 | * but in this case, we are only testing for the DELALLOC |
75eff68e CM |
1711 | * bit, which is only set or cleared with irqs on |
1712 | */ | |
0ca1f7ce | 1713 | if (!(state->state & EXTENT_DELALLOC) && (*bits & EXTENT_DELALLOC)) { |
291d673e | 1714 | struct btrfs_root *root = BTRFS_I(inode)->root; |
0ca1f7ce | 1715 | u64 len = state->end + 1 - state->start; |
83eea1f1 | 1716 | bool do_list = !btrfs_is_free_space_inode(inode); |
9ed74f2d | 1717 | |
9e0baf60 | 1718 | if (*bits & EXTENT_FIRST_DELALLOC) { |
0ca1f7ce | 1719 | *bits &= ~EXTENT_FIRST_DELALLOC; |
9e0baf60 JB |
1720 | } else { |
1721 | spin_lock(&BTRFS_I(inode)->lock); | |
1722 | BTRFS_I(inode)->outstanding_extents++; | |
1723 | spin_unlock(&BTRFS_I(inode)->lock); | |
1724 | } | |
287a0ab9 | 1725 | |
6a3891c5 JB |
1726 | /* For sanity tests */ |
1727 | if (btrfs_test_is_dummy_root(root)) | |
1728 | return; | |
1729 | ||
963d678b MX |
1730 | __percpu_counter_add(&root->fs_info->delalloc_bytes, len, |
1731 | root->fs_info->delalloc_batch); | |
df0af1a5 | 1732 | spin_lock(&BTRFS_I(inode)->lock); |
0ca1f7ce | 1733 | BTRFS_I(inode)->delalloc_bytes += len; |
47059d93 WS |
1734 | if (*bits & EXTENT_DEFRAG) |
1735 | BTRFS_I(inode)->defrag_bytes += len; | |
df0af1a5 | 1736 | if (do_list && !test_bit(BTRFS_INODE_IN_DELALLOC_LIST, |
eb73c1b7 MX |
1737 | &BTRFS_I(inode)->runtime_flags)) |
1738 | btrfs_add_delalloc_inodes(root, inode); | |
df0af1a5 | 1739 | spin_unlock(&BTRFS_I(inode)->lock); |
291d673e | 1740 | } |
291d673e CM |
1741 | } |
1742 | ||
d352ac68 CM |
1743 | /* |
1744 | * extent_io.c clear_bit_hook, see set_bit_hook for why | |
1745 | */ | |
1bf85046 | 1746 | static void btrfs_clear_bit_hook(struct inode *inode, |
41074888 | 1747 | struct extent_state *state, |
9ee49a04 | 1748 | unsigned *bits) |
291d673e | 1749 | { |
47059d93 | 1750 | u64 len = state->end + 1 - state->start; |
dcab6a3b JB |
1751 | u64 num_extents = div64_u64(len + BTRFS_MAX_EXTENT_SIZE -1, |
1752 | BTRFS_MAX_EXTENT_SIZE); | |
47059d93 WS |
1753 | |
1754 | spin_lock(&BTRFS_I(inode)->lock); | |
1755 | if ((state->state & EXTENT_DEFRAG) && (*bits & EXTENT_DEFRAG)) | |
1756 | BTRFS_I(inode)->defrag_bytes -= len; | |
1757 | spin_unlock(&BTRFS_I(inode)->lock); | |
1758 | ||
75eff68e CM |
1759 | /* |
1760 | * set_bit and clear bit hooks normally require _irqsave/restore | |
27160b6b | 1761 | * but in this case, we are only testing for the DELALLOC |
75eff68e CM |
1762 | * bit, which is only set or cleared with irqs on |
1763 | */ | |
0ca1f7ce | 1764 | if ((state->state & EXTENT_DELALLOC) && (*bits & EXTENT_DELALLOC)) { |
291d673e | 1765 | struct btrfs_root *root = BTRFS_I(inode)->root; |
83eea1f1 | 1766 | bool do_list = !btrfs_is_free_space_inode(inode); |
bcbfce8a | 1767 | |
9e0baf60 | 1768 | if (*bits & EXTENT_FIRST_DELALLOC) { |
0ca1f7ce | 1769 | *bits &= ~EXTENT_FIRST_DELALLOC; |
9e0baf60 JB |
1770 | } else if (!(*bits & EXTENT_DO_ACCOUNTING)) { |
1771 | spin_lock(&BTRFS_I(inode)->lock); | |
dcab6a3b | 1772 | BTRFS_I(inode)->outstanding_extents -= num_extents; |
9e0baf60 JB |
1773 | spin_unlock(&BTRFS_I(inode)->lock); |
1774 | } | |
0ca1f7ce | 1775 | |
b6d08f06 JB |
1776 | /* |
1777 | * We don't reserve metadata space for space cache inodes so we | |
1778 | * don't need to call dellalloc_release_metadata if there is an | |
1779 | * error. | |
1780 | */ | |
1781 | if (*bits & EXTENT_DO_ACCOUNTING && | |
1782 | root != root->fs_info->tree_root) | |
0ca1f7ce YZ |
1783 | btrfs_delalloc_release_metadata(inode, len); |
1784 | ||
6a3891c5 JB |
1785 | /* For sanity tests. */ |
1786 | if (btrfs_test_is_dummy_root(root)) | |
1787 | return; | |
1788 | ||
0cb59c99 | 1789 | if (root->root_key.objectid != BTRFS_DATA_RELOC_TREE_OBJECTID |
7ee9e440 | 1790 | && do_list && !(state->state & EXTENT_NORESERVE)) |
51773bec QW |
1791 | btrfs_free_reserved_data_space_noquota(inode, |
1792 | state->start, len); | |
9ed74f2d | 1793 | |
963d678b MX |
1794 | __percpu_counter_add(&root->fs_info->delalloc_bytes, -len, |
1795 | root->fs_info->delalloc_batch); | |
df0af1a5 | 1796 | spin_lock(&BTRFS_I(inode)->lock); |
0ca1f7ce | 1797 | BTRFS_I(inode)->delalloc_bytes -= len; |
0cb59c99 | 1798 | if (do_list && BTRFS_I(inode)->delalloc_bytes == 0 && |
df0af1a5 | 1799 | test_bit(BTRFS_INODE_IN_DELALLOC_LIST, |
eb73c1b7 MX |
1800 | &BTRFS_I(inode)->runtime_flags)) |
1801 | btrfs_del_delalloc_inode(root, inode); | |
df0af1a5 | 1802 | spin_unlock(&BTRFS_I(inode)->lock); |
291d673e | 1803 | } |
291d673e CM |
1804 | } |
1805 | ||
d352ac68 CM |
1806 | /* |
1807 | * extent_io.c merge_bio_hook, this must check the chunk tree to make sure | |
1808 | * we don't create bios that span stripes or chunks | |
1809 | */ | |
64a16701 | 1810 | int btrfs_merge_bio_hook(int rw, struct page *page, unsigned long offset, |
c8b97818 CM |
1811 | size_t size, struct bio *bio, |
1812 | unsigned long bio_flags) | |
239b14b3 CM |
1813 | { |
1814 | struct btrfs_root *root = BTRFS_I(page->mapping->host)->root; | |
4f024f37 | 1815 | u64 logical = (u64)bio->bi_iter.bi_sector << 9; |
239b14b3 CM |
1816 | u64 length = 0; |
1817 | u64 map_length; | |
239b14b3 CM |
1818 | int ret; |
1819 | ||
771ed689 CM |
1820 | if (bio_flags & EXTENT_BIO_COMPRESSED) |
1821 | return 0; | |
1822 | ||
4f024f37 | 1823 | length = bio->bi_iter.bi_size; |
239b14b3 | 1824 | map_length = length; |
64a16701 | 1825 | ret = btrfs_map_block(root->fs_info, rw, logical, |
f188591e | 1826 | &map_length, NULL, 0); |
3ec706c8 | 1827 | /* Will always return 0 with map_multi == NULL */ |
3444a972 | 1828 | BUG_ON(ret < 0); |
d397712b | 1829 | if (map_length < length + size) |
239b14b3 | 1830 | return 1; |
3444a972 | 1831 | return 0; |
239b14b3 CM |
1832 | } |
1833 | ||
d352ac68 CM |
1834 | /* |
1835 | * in order to insert checksums into the metadata in large chunks, | |
1836 | * we wait until bio submission time. All the pages in the bio are | |
1837 | * checksummed and sums are attached onto the ordered extent record. | |
1838 | * | |
1839 | * At IO completion time the cums attached on the ordered extent record | |
1840 | * are inserted into the btree | |
1841 | */ | |
d397712b CM |
1842 | static int __btrfs_submit_bio_start(struct inode *inode, int rw, |
1843 | struct bio *bio, int mirror_num, | |
eaf25d93 CM |
1844 | unsigned long bio_flags, |
1845 | u64 bio_offset) | |
065631f6 | 1846 | { |
065631f6 | 1847 | struct btrfs_root *root = BTRFS_I(inode)->root; |
065631f6 | 1848 | int ret = 0; |
e015640f | 1849 | |
d20f7043 | 1850 | ret = btrfs_csum_one_bio(root, inode, bio, 0, 0); |
79787eaa | 1851 | BUG_ON(ret); /* -ENOMEM */ |
4a69a410 CM |
1852 | return 0; |
1853 | } | |
e015640f | 1854 | |
4a69a410 CM |
1855 | /* |
1856 | * in order to insert checksums into the metadata in large chunks, | |
1857 | * we wait until bio submission time. All the pages in the bio are | |
1858 | * checksummed and sums are attached onto the ordered extent record. | |
1859 | * | |
1860 | * At IO completion time the cums attached on the ordered extent record | |
1861 | * are inserted into the btree | |
1862 | */ | |
b2950863 | 1863 | static int __btrfs_submit_bio_done(struct inode *inode, int rw, struct bio *bio, |
eaf25d93 CM |
1864 | int mirror_num, unsigned long bio_flags, |
1865 | u64 bio_offset) | |
4a69a410 CM |
1866 | { |
1867 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
61891923 SB |
1868 | int ret; |
1869 | ||
1870 | ret = btrfs_map_bio(root, rw, bio, mirror_num, 1); | |
4246a0b6 CH |
1871 | if (ret) { |
1872 | bio->bi_error = ret; | |
1873 | bio_endio(bio); | |
1874 | } | |
61891923 | 1875 | return ret; |
44b8bd7e CM |
1876 | } |
1877 | ||
d352ac68 | 1878 | /* |
cad321ad CM |
1879 | * extent_io.c submission hook. This does the right thing for csum calculation |
1880 | * on write, or reading the csums from the tree before a read | |
d352ac68 | 1881 | */ |
b2950863 | 1882 | static int btrfs_submit_bio_hook(struct inode *inode, int rw, struct bio *bio, |
eaf25d93 CM |
1883 | int mirror_num, unsigned long bio_flags, |
1884 | u64 bio_offset) | |
44b8bd7e CM |
1885 | { |
1886 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
0d51e28a | 1887 | enum btrfs_wq_endio_type metadata = BTRFS_WQ_ENDIO_DATA; |
44b8bd7e | 1888 | int ret = 0; |
19b9bdb0 | 1889 | int skip_sum; |
b812ce28 | 1890 | int async = !atomic_read(&BTRFS_I(inode)->sync_writers); |
44b8bd7e | 1891 | |
6cbff00f | 1892 | skip_sum = BTRFS_I(inode)->flags & BTRFS_INODE_NODATASUM; |
cad321ad | 1893 | |
83eea1f1 | 1894 | if (btrfs_is_free_space_inode(inode)) |
0d51e28a | 1895 | metadata = BTRFS_WQ_ENDIO_FREE_SPACE; |
0417341e | 1896 | |
7b6d91da | 1897 | if (!(rw & REQ_WRITE)) { |
5fd02043 JB |
1898 | ret = btrfs_bio_wq_end_io(root->fs_info, bio, metadata); |
1899 | if (ret) | |
61891923 | 1900 | goto out; |
5fd02043 | 1901 | |
d20f7043 | 1902 | if (bio_flags & EXTENT_BIO_COMPRESSED) { |
61891923 SB |
1903 | ret = btrfs_submit_compressed_read(inode, bio, |
1904 | mirror_num, | |
1905 | bio_flags); | |
1906 | goto out; | |
c2db1073 TI |
1907 | } else if (!skip_sum) { |
1908 | ret = btrfs_lookup_bio_sums(root, inode, bio, NULL); | |
1909 | if (ret) | |
61891923 | 1910 | goto out; |
c2db1073 | 1911 | } |
4d1b5fb4 | 1912 | goto mapit; |
b812ce28 | 1913 | } else if (async && !skip_sum) { |
17d217fe YZ |
1914 | /* csum items have already been cloned */ |
1915 | if (root->root_key.objectid == BTRFS_DATA_RELOC_TREE_OBJECTID) | |
1916 | goto mapit; | |
19b9bdb0 | 1917 | /* we're doing a write, do the async checksumming */ |
61891923 | 1918 | ret = btrfs_wq_submit_bio(BTRFS_I(inode)->root->fs_info, |
44b8bd7e | 1919 | inode, rw, bio, mirror_num, |
eaf25d93 CM |
1920 | bio_flags, bio_offset, |
1921 | __btrfs_submit_bio_start, | |
4a69a410 | 1922 | __btrfs_submit_bio_done); |
61891923 | 1923 | goto out; |
b812ce28 JB |
1924 | } else if (!skip_sum) { |
1925 | ret = btrfs_csum_one_bio(root, inode, bio, 0, 0); | |
1926 | if (ret) | |
1927 | goto out; | |
19b9bdb0 CM |
1928 | } |
1929 | ||
0b86a832 | 1930 | mapit: |
61891923 SB |
1931 | ret = btrfs_map_bio(root, rw, bio, mirror_num, 0); |
1932 | ||
1933 | out: | |
4246a0b6 CH |
1934 | if (ret < 0) { |
1935 | bio->bi_error = ret; | |
1936 | bio_endio(bio); | |
1937 | } | |
61891923 | 1938 | return ret; |
065631f6 | 1939 | } |
6885f308 | 1940 | |
d352ac68 CM |
1941 | /* |
1942 | * given a list of ordered sums record them in the inode. This happens | |
1943 | * at IO completion time based on sums calculated at bio submission time. | |
1944 | */ | |
ba1da2f4 | 1945 | static noinline int add_pending_csums(struct btrfs_trans_handle *trans, |
e6dcd2dc CM |
1946 | struct inode *inode, u64 file_offset, |
1947 | struct list_head *list) | |
1948 | { | |
e6dcd2dc CM |
1949 | struct btrfs_ordered_sum *sum; |
1950 | ||
c6e30871 | 1951 | list_for_each_entry(sum, list, list) { |
39847c4d | 1952 | trans->adding_csums = 1; |
d20f7043 CM |
1953 | btrfs_csum_file_blocks(trans, |
1954 | BTRFS_I(inode)->root->fs_info->csum_root, sum); | |
39847c4d | 1955 | trans->adding_csums = 0; |
e6dcd2dc CM |
1956 | } |
1957 | return 0; | |
1958 | } | |
1959 | ||
2ac55d41 JB |
1960 | int btrfs_set_extent_delalloc(struct inode *inode, u64 start, u64 end, |
1961 | struct extent_state **cached_state) | |
ea8c2819 | 1962 | { |
6c1500f2 | 1963 | WARN_ON((end & (PAGE_CACHE_SIZE - 1)) == 0); |
ea8c2819 | 1964 | return set_extent_delalloc(&BTRFS_I(inode)->io_tree, start, end, |
2ac55d41 | 1965 | cached_state, GFP_NOFS); |
ea8c2819 CM |
1966 | } |
1967 | ||
d352ac68 | 1968 | /* see btrfs_writepage_start_hook for details on why this is required */ |
247e743c CM |
1969 | struct btrfs_writepage_fixup { |
1970 | struct page *page; | |
1971 | struct btrfs_work work; | |
1972 | }; | |
1973 | ||
b2950863 | 1974 | static void btrfs_writepage_fixup_worker(struct btrfs_work *work) |
247e743c CM |
1975 | { |
1976 | struct btrfs_writepage_fixup *fixup; | |
1977 | struct btrfs_ordered_extent *ordered; | |
2ac55d41 | 1978 | struct extent_state *cached_state = NULL; |
247e743c CM |
1979 | struct page *page; |
1980 | struct inode *inode; | |
1981 | u64 page_start; | |
1982 | u64 page_end; | |
87826df0 | 1983 | int ret; |
247e743c CM |
1984 | |
1985 | fixup = container_of(work, struct btrfs_writepage_fixup, work); | |
1986 | page = fixup->page; | |
4a096752 | 1987 | again: |
247e743c CM |
1988 | lock_page(page); |
1989 | if (!page->mapping || !PageDirty(page) || !PageChecked(page)) { | |
1990 | ClearPageChecked(page); | |
1991 | goto out_page; | |
1992 | } | |
1993 | ||
1994 | inode = page->mapping->host; | |
1995 | page_start = page_offset(page); | |
1996 | page_end = page_offset(page) + PAGE_CACHE_SIZE - 1; | |
1997 | ||
ff13db41 | 1998 | lock_extent_bits(&BTRFS_I(inode)->io_tree, page_start, page_end, |
d0082371 | 1999 | &cached_state); |
4a096752 CM |
2000 | |
2001 | /* already ordered? We're done */ | |
8b62b72b | 2002 | if (PagePrivate2(page)) |
247e743c | 2003 | goto out; |
4a096752 CM |
2004 | |
2005 | ordered = btrfs_lookup_ordered_extent(inode, page_start); | |
2006 | if (ordered) { | |
2ac55d41 JB |
2007 | unlock_extent_cached(&BTRFS_I(inode)->io_tree, page_start, |
2008 | page_end, &cached_state, GFP_NOFS); | |
4a096752 CM |
2009 | unlock_page(page); |
2010 | btrfs_start_ordered_extent(inode, ordered, 1); | |
87826df0 | 2011 | btrfs_put_ordered_extent(ordered); |
4a096752 CM |
2012 | goto again; |
2013 | } | |
247e743c | 2014 | |
7cf5b976 QW |
2015 | ret = btrfs_delalloc_reserve_space(inode, page_start, |
2016 | PAGE_CACHE_SIZE); | |
87826df0 JM |
2017 | if (ret) { |
2018 | mapping_set_error(page->mapping, ret); | |
2019 | end_extent_writepage(page, ret, page_start, page_end); | |
2020 | ClearPageChecked(page); | |
2021 | goto out; | |
2022 | } | |
2023 | ||
2ac55d41 | 2024 | btrfs_set_extent_delalloc(inode, page_start, page_end, &cached_state); |
247e743c | 2025 | ClearPageChecked(page); |
87826df0 | 2026 | set_page_dirty(page); |
247e743c | 2027 | out: |
2ac55d41 JB |
2028 | unlock_extent_cached(&BTRFS_I(inode)->io_tree, page_start, page_end, |
2029 | &cached_state, GFP_NOFS); | |
247e743c CM |
2030 | out_page: |
2031 | unlock_page(page); | |
2032 | page_cache_release(page); | |
b897abec | 2033 | kfree(fixup); |
247e743c CM |
2034 | } |
2035 | ||
2036 | /* | |
2037 | * There are a few paths in the higher layers of the kernel that directly | |
2038 | * set the page dirty bit without asking the filesystem if it is a | |
2039 | * good idea. This causes problems because we want to make sure COW | |
2040 | * properly happens and the data=ordered rules are followed. | |
2041 | * | |
c8b97818 | 2042 | * In our case any range that doesn't have the ORDERED bit set |
247e743c CM |
2043 | * hasn't been properly setup for IO. We kick off an async process |
2044 | * to fix it up. The async helper will wait for ordered extents, set | |
2045 | * the delalloc bit and make it safe to write the page. | |
2046 | */ | |
b2950863 | 2047 | static int btrfs_writepage_start_hook(struct page *page, u64 start, u64 end) |
247e743c CM |
2048 | { |
2049 | struct inode *inode = page->mapping->host; | |
2050 | struct btrfs_writepage_fixup *fixup; | |
2051 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
247e743c | 2052 | |
8b62b72b CM |
2053 | /* this page is properly in the ordered list */ |
2054 | if (TestClearPagePrivate2(page)) | |
247e743c CM |
2055 | return 0; |
2056 | ||
2057 | if (PageChecked(page)) | |
2058 | return -EAGAIN; | |
2059 | ||
2060 | fixup = kzalloc(sizeof(*fixup), GFP_NOFS); | |
2061 | if (!fixup) | |
2062 | return -EAGAIN; | |
f421950f | 2063 | |
247e743c CM |
2064 | SetPageChecked(page); |
2065 | page_cache_get(page); | |
9e0af237 LB |
2066 | btrfs_init_work(&fixup->work, btrfs_fixup_helper, |
2067 | btrfs_writepage_fixup_worker, NULL, NULL); | |
247e743c | 2068 | fixup->page = page; |
dc6e3209 | 2069 | btrfs_queue_work(root->fs_info->fixup_workers, &fixup->work); |
87826df0 | 2070 | return -EBUSY; |
247e743c CM |
2071 | } |
2072 | ||
d899e052 YZ |
2073 | static int insert_reserved_file_extent(struct btrfs_trans_handle *trans, |
2074 | struct inode *inode, u64 file_pos, | |
2075 | u64 disk_bytenr, u64 disk_num_bytes, | |
2076 | u64 num_bytes, u64 ram_bytes, | |
2077 | u8 compression, u8 encryption, | |
2078 | u16 other_encoding, int extent_type) | |
2079 | { | |
2080 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
2081 | struct btrfs_file_extent_item *fi; | |
2082 | struct btrfs_path *path; | |
2083 | struct extent_buffer *leaf; | |
2084 | struct btrfs_key ins; | |
1acae57b | 2085 | int extent_inserted = 0; |
d899e052 YZ |
2086 | int ret; |
2087 | ||
2088 | path = btrfs_alloc_path(); | |
d8926bb3 MF |
2089 | if (!path) |
2090 | return -ENOMEM; | |
d899e052 | 2091 | |
a1ed835e CM |
2092 | /* |
2093 | * we may be replacing one extent in the tree with another. | |
2094 | * The new extent is pinned in the extent map, and we don't want | |
2095 | * to drop it from the cache until it is completely in the btree. | |
2096 | * | |
2097 | * So, tell btrfs_drop_extents to leave this extent in the cache. | |
2098 | * the caller is expected to unpin it and allow it to be merged | |
2099 | * with the others. | |
2100 | */ | |
1acae57b FDBM |
2101 | ret = __btrfs_drop_extents(trans, root, inode, path, file_pos, |
2102 | file_pos + num_bytes, NULL, 0, | |
2103 | 1, sizeof(*fi), &extent_inserted); | |
79787eaa JM |
2104 | if (ret) |
2105 | goto out; | |
d899e052 | 2106 | |
1acae57b FDBM |
2107 | if (!extent_inserted) { |
2108 | ins.objectid = btrfs_ino(inode); | |
2109 | ins.offset = file_pos; | |
2110 | ins.type = BTRFS_EXTENT_DATA_KEY; | |
2111 | ||
2112 | path->leave_spinning = 1; | |
2113 | ret = btrfs_insert_empty_item(trans, root, path, &ins, | |
2114 | sizeof(*fi)); | |
2115 | if (ret) | |
2116 | goto out; | |
2117 | } | |
d899e052 YZ |
2118 | leaf = path->nodes[0]; |
2119 | fi = btrfs_item_ptr(leaf, path->slots[0], | |
2120 | struct btrfs_file_extent_item); | |
2121 | btrfs_set_file_extent_generation(leaf, fi, trans->transid); | |
2122 | btrfs_set_file_extent_type(leaf, fi, extent_type); | |
2123 | btrfs_set_file_extent_disk_bytenr(leaf, fi, disk_bytenr); | |
2124 | btrfs_set_file_extent_disk_num_bytes(leaf, fi, disk_num_bytes); | |
2125 | btrfs_set_file_extent_offset(leaf, fi, 0); | |
2126 | btrfs_set_file_extent_num_bytes(leaf, fi, num_bytes); | |
2127 | btrfs_set_file_extent_ram_bytes(leaf, fi, ram_bytes); | |
2128 | btrfs_set_file_extent_compression(leaf, fi, compression); | |
2129 | btrfs_set_file_extent_encryption(leaf, fi, encryption); | |
2130 | btrfs_set_file_extent_other_encoding(leaf, fi, other_encoding); | |
b9473439 | 2131 | |
d899e052 | 2132 | btrfs_mark_buffer_dirty(leaf); |
ce195332 | 2133 | btrfs_release_path(path); |
d899e052 YZ |
2134 | |
2135 | inode_add_bytes(inode, num_bytes); | |
d899e052 YZ |
2136 | |
2137 | ins.objectid = disk_bytenr; | |
2138 | ins.offset = disk_num_bytes; | |
2139 | ins.type = BTRFS_EXTENT_ITEM_KEY; | |
5d4f98a2 YZ |
2140 | ret = btrfs_alloc_reserved_file_extent(trans, root, |
2141 | root->root_key.objectid, | |
5846a3c2 QW |
2142 | btrfs_ino(inode), file_pos, |
2143 | ram_bytes, &ins); | |
297d750b | 2144 | /* |
5846a3c2 QW |
2145 | * Release the reserved range from inode dirty range map, as it is |
2146 | * already moved into delayed_ref_head | |
297d750b QW |
2147 | */ |
2148 | btrfs_qgroup_release_data(inode, file_pos, ram_bytes); | |
79787eaa | 2149 | out: |
d899e052 | 2150 | btrfs_free_path(path); |
b9473439 | 2151 | |
79787eaa | 2152 | return ret; |
d899e052 YZ |
2153 | } |
2154 | ||
38c227d8 LB |
2155 | /* snapshot-aware defrag */ |
2156 | struct sa_defrag_extent_backref { | |
2157 | struct rb_node node; | |
2158 | struct old_sa_defrag_extent *old; | |
2159 | u64 root_id; | |
2160 | u64 inum; | |
2161 | u64 file_pos; | |
2162 | u64 extent_offset; | |
2163 | u64 num_bytes; | |
2164 | u64 generation; | |
2165 | }; | |
2166 | ||
2167 | struct old_sa_defrag_extent { | |
2168 | struct list_head list; | |
2169 | struct new_sa_defrag_extent *new; | |
2170 | ||
2171 | u64 extent_offset; | |
2172 | u64 bytenr; | |
2173 | u64 offset; | |
2174 | u64 len; | |
2175 | int count; | |
2176 | }; | |
2177 | ||
2178 | struct new_sa_defrag_extent { | |
2179 | struct rb_root root; | |
2180 | struct list_head head; | |
2181 | struct btrfs_path *path; | |
2182 | struct inode *inode; | |
2183 | u64 file_pos; | |
2184 | u64 len; | |
2185 | u64 bytenr; | |
2186 | u64 disk_len; | |
2187 | u8 compress_type; | |
2188 | }; | |
2189 | ||
2190 | static int backref_comp(struct sa_defrag_extent_backref *b1, | |
2191 | struct sa_defrag_extent_backref *b2) | |
2192 | { | |
2193 | if (b1->root_id < b2->root_id) | |
2194 | return -1; | |
2195 | else if (b1->root_id > b2->root_id) | |
2196 | return 1; | |
2197 | ||
2198 | if (b1->inum < b2->inum) | |
2199 | return -1; | |
2200 | else if (b1->inum > b2->inum) | |
2201 | return 1; | |
2202 | ||
2203 | if (b1->file_pos < b2->file_pos) | |
2204 | return -1; | |
2205 | else if (b1->file_pos > b2->file_pos) | |
2206 | return 1; | |
2207 | ||
2208 | /* | |
2209 | * [------------------------------] ===> (a range of space) | |
2210 | * |<--->| |<---->| =============> (fs/file tree A) | |
2211 | * |<---------------------------->| ===> (fs/file tree B) | |
2212 | * | |
2213 | * A range of space can refer to two file extents in one tree while | |
2214 | * refer to only one file extent in another tree. | |
2215 | * | |
2216 | * So we may process a disk offset more than one time(two extents in A) | |
2217 | * and locate at the same extent(one extent in B), then insert two same | |
2218 | * backrefs(both refer to the extent in B). | |
2219 | */ | |
2220 | return 0; | |
2221 | } | |
2222 | ||
2223 | static void backref_insert(struct rb_root *root, | |
2224 | struct sa_defrag_extent_backref *backref) | |
2225 | { | |
2226 | struct rb_node **p = &root->rb_node; | |
2227 | struct rb_node *parent = NULL; | |
2228 | struct sa_defrag_extent_backref *entry; | |
2229 | int ret; | |
2230 | ||
2231 | while (*p) { | |
2232 | parent = *p; | |
2233 | entry = rb_entry(parent, struct sa_defrag_extent_backref, node); | |
2234 | ||
2235 | ret = backref_comp(backref, entry); | |
2236 | if (ret < 0) | |
2237 | p = &(*p)->rb_left; | |
2238 | else | |
2239 | p = &(*p)->rb_right; | |
2240 | } | |
2241 | ||
2242 | rb_link_node(&backref->node, parent, p); | |
2243 | rb_insert_color(&backref->node, root); | |
2244 | } | |
2245 | ||
2246 | /* | |
2247 | * Note the backref might has changed, and in this case we just return 0. | |
2248 | */ | |
2249 | static noinline int record_one_backref(u64 inum, u64 offset, u64 root_id, | |
2250 | void *ctx) | |
2251 | { | |
2252 | struct btrfs_file_extent_item *extent; | |
2253 | struct btrfs_fs_info *fs_info; | |
2254 | struct old_sa_defrag_extent *old = ctx; | |
2255 | struct new_sa_defrag_extent *new = old->new; | |
2256 | struct btrfs_path *path = new->path; | |
2257 | struct btrfs_key key; | |
2258 | struct btrfs_root *root; | |
2259 | struct sa_defrag_extent_backref *backref; | |
2260 | struct extent_buffer *leaf; | |
2261 | struct inode *inode = new->inode; | |
2262 | int slot; | |
2263 | int ret; | |
2264 | u64 extent_offset; | |
2265 | u64 num_bytes; | |
2266 | ||
2267 | if (BTRFS_I(inode)->root->root_key.objectid == root_id && | |
2268 | inum == btrfs_ino(inode)) | |
2269 | return 0; | |
2270 | ||
2271 | key.objectid = root_id; | |
2272 | key.type = BTRFS_ROOT_ITEM_KEY; | |
2273 | key.offset = (u64)-1; | |
2274 | ||
2275 | fs_info = BTRFS_I(inode)->root->fs_info; | |
2276 | root = btrfs_read_fs_root_no_name(fs_info, &key); | |
2277 | if (IS_ERR(root)) { | |
2278 | if (PTR_ERR(root) == -ENOENT) | |
2279 | return 0; | |
2280 | WARN_ON(1); | |
2281 | pr_debug("inum=%llu, offset=%llu, root_id=%llu\n", | |
2282 | inum, offset, root_id); | |
2283 | return PTR_ERR(root); | |
2284 | } | |
2285 | ||
2286 | key.objectid = inum; | |
2287 | key.type = BTRFS_EXTENT_DATA_KEY; | |
2288 | if (offset > (u64)-1 << 32) | |
2289 | key.offset = 0; | |
2290 | else | |
2291 | key.offset = offset; | |
2292 | ||
2293 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); | |
fae7f21c | 2294 | if (WARN_ON(ret < 0)) |
38c227d8 | 2295 | return ret; |
50f1319c | 2296 | ret = 0; |
38c227d8 LB |
2297 | |
2298 | while (1) { | |
2299 | cond_resched(); | |
2300 | ||
2301 | leaf = path->nodes[0]; | |
2302 | slot = path->slots[0]; | |
2303 | ||
2304 | if (slot >= btrfs_header_nritems(leaf)) { | |
2305 | ret = btrfs_next_leaf(root, path); | |
2306 | if (ret < 0) { | |
2307 | goto out; | |
2308 | } else if (ret > 0) { | |
2309 | ret = 0; | |
2310 | goto out; | |
2311 | } | |
2312 | continue; | |
2313 | } | |
2314 | ||
2315 | path->slots[0]++; | |
2316 | ||
2317 | btrfs_item_key_to_cpu(leaf, &key, slot); | |
2318 | ||
2319 | if (key.objectid > inum) | |
2320 | goto out; | |
2321 | ||
2322 | if (key.objectid < inum || key.type != BTRFS_EXTENT_DATA_KEY) | |
2323 | continue; | |
2324 | ||
2325 | extent = btrfs_item_ptr(leaf, slot, | |
2326 | struct btrfs_file_extent_item); | |
2327 | ||
2328 | if (btrfs_file_extent_disk_bytenr(leaf, extent) != old->bytenr) | |
2329 | continue; | |
2330 | ||
e68afa49 LB |
2331 | /* |
2332 | * 'offset' refers to the exact key.offset, | |
2333 | * NOT the 'offset' field in btrfs_extent_data_ref, ie. | |
2334 | * (key.offset - extent_offset). | |
2335 | */ | |
2336 | if (key.offset != offset) | |
38c227d8 LB |
2337 | continue; |
2338 | ||
e68afa49 | 2339 | extent_offset = btrfs_file_extent_offset(leaf, extent); |
38c227d8 | 2340 | num_bytes = btrfs_file_extent_num_bytes(leaf, extent); |
e68afa49 | 2341 | |
38c227d8 LB |
2342 | if (extent_offset >= old->extent_offset + old->offset + |
2343 | old->len || extent_offset + num_bytes <= | |
2344 | old->extent_offset + old->offset) | |
2345 | continue; | |
38c227d8 LB |
2346 | break; |
2347 | } | |
2348 | ||
2349 | backref = kmalloc(sizeof(*backref), GFP_NOFS); | |
2350 | if (!backref) { | |
2351 | ret = -ENOENT; | |
2352 | goto out; | |
2353 | } | |
2354 | ||
2355 | backref->root_id = root_id; | |
2356 | backref->inum = inum; | |
e68afa49 | 2357 | backref->file_pos = offset; |
38c227d8 LB |
2358 | backref->num_bytes = num_bytes; |
2359 | backref->extent_offset = extent_offset; | |
2360 | backref->generation = btrfs_file_extent_generation(leaf, extent); | |
2361 | backref->old = old; | |
2362 | backref_insert(&new->root, backref); | |
2363 | old->count++; | |
2364 | out: | |
2365 | btrfs_release_path(path); | |
2366 | WARN_ON(ret); | |
2367 | return ret; | |
2368 | } | |
2369 | ||
2370 | static noinline bool record_extent_backrefs(struct btrfs_path *path, | |
2371 | struct new_sa_defrag_extent *new) | |
2372 | { | |
2373 | struct btrfs_fs_info *fs_info = BTRFS_I(new->inode)->root->fs_info; | |
2374 | struct old_sa_defrag_extent *old, *tmp; | |
2375 | int ret; | |
2376 | ||
2377 | new->path = path; | |
2378 | ||
2379 | list_for_each_entry_safe(old, tmp, &new->head, list) { | |
e68afa49 LB |
2380 | ret = iterate_inodes_from_logical(old->bytenr + |
2381 | old->extent_offset, fs_info, | |
38c227d8 LB |
2382 | path, record_one_backref, |
2383 | old); | |
4724b106 JB |
2384 | if (ret < 0 && ret != -ENOENT) |
2385 | return false; | |
38c227d8 LB |
2386 | |
2387 | /* no backref to be processed for this extent */ | |
2388 | if (!old->count) { | |
2389 | list_del(&old->list); | |
2390 | kfree(old); | |
2391 | } | |
2392 | } | |
2393 | ||
2394 | if (list_empty(&new->head)) | |
2395 | return false; | |
2396 | ||
2397 | return true; | |
2398 | } | |
2399 | ||
2400 | static int relink_is_mergable(struct extent_buffer *leaf, | |
2401 | struct btrfs_file_extent_item *fi, | |
116e0024 | 2402 | struct new_sa_defrag_extent *new) |
38c227d8 | 2403 | { |
116e0024 | 2404 | if (btrfs_file_extent_disk_bytenr(leaf, fi) != new->bytenr) |
38c227d8 LB |
2405 | return 0; |
2406 | ||
2407 | if (btrfs_file_extent_type(leaf, fi) != BTRFS_FILE_EXTENT_REG) | |
2408 | return 0; | |
2409 | ||
116e0024 LB |
2410 | if (btrfs_file_extent_compression(leaf, fi) != new->compress_type) |
2411 | return 0; | |
2412 | ||
2413 | if (btrfs_file_extent_encryption(leaf, fi) || | |
38c227d8 LB |
2414 | btrfs_file_extent_other_encoding(leaf, fi)) |
2415 | return 0; | |
2416 | ||
2417 | return 1; | |
2418 | } | |
2419 | ||
2420 | /* | |
2421 | * Note the backref might has changed, and in this case we just return 0. | |
2422 | */ | |
2423 | static noinline int relink_extent_backref(struct btrfs_path *path, | |
2424 | struct sa_defrag_extent_backref *prev, | |
2425 | struct sa_defrag_extent_backref *backref) | |
2426 | { | |
2427 | struct btrfs_file_extent_item *extent; | |
2428 | struct btrfs_file_extent_item *item; | |
2429 | struct btrfs_ordered_extent *ordered; | |
2430 | struct btrfs_trans_handle *trans; | |
2431 | struct btrfs_fs_info *fs_info; | |
2432 | struct btrfs_root *root; | |
2433 | struct btrfs_key key; | |
2434 | struct extent_buffer *leaf; | |
2435 | struct old_sa_defrag_extent *old = backref->old; | |
2436 | struct new_sa_defrag_extent *new = old->new; | |
2437 | struct inode *src_inode = new->inode; | |
2438 | struct inode *inode; | |
2439 | struct extent_state *cached = NULL; | |
2440 | int ret = 0; | |
2441 | u64 start; | |
2442 | u64 len; | |
2443 | u64 lock_start; | |
2444 | u64 lock_end; | |
2445 | bool merge = false; | |
2446 | int index; | |
2447 | ||
2448 | if (prev && prev->root_id == backref->root_id && | |
2449 | prev->inum == backref->inum && | |
2450 | prev->file_pos + prev->num_bytes == backref->file_pos) | |
2451 | merge = true; | |
2452 | ||
2453 | /* step 1: get root */ | |
2454 | key.objectid = backref->root_id; | |
2455 | key.type = BTRFS_ROOT_ITEM_KEY; | |
2456 | key.offset = (u64)-1; | |
2457 | ||
2458 | fs_info = BTRFS_I(src_inode)->root->fs_info; | |
2459 | index = srcu_read_lock(&fs_info->subvol_srcu); | |
2460 | ||
2461 | root = btrfs_read_fs_root_no_name(fs_info, &key); | |
2462 | if (IS_ERR(root)) { | |
2463 | srcu_read_unlock(&fs_info->subvol_srcu, index); | |
2464 | if (PTR_ERR(root) == -ENOENT) | |
2465 | return 0; | |
2466 | return PTR_ERR(root); | |
2467 | } | |
38c227d8 | 2468 | |
bcbba5e6 WS |
2469 | if (btrfs_root_readonly(root)) { |
2470 | srcu_read_unlock(&fs_info->subvol_srcu, index); | |
2471 | return 0; | |
2472 | } | |
2473 | ||
38c227d8 LB |
2474 | /* step 2: get inode */ |
2475 | key.objectid = backref->inum; | |
2476 | key.type = BTRFS_INODE_ITEM_KEY; | |
2477 | key.offset = 0; | |
2478 | ||
2479 | inode = btrfs_iget(fs_info->sb, &key, root, NULL); | |
2480 | if (IS_ERR(inode)) { | |
2481 | srcu_read_unlock(&fs_info->subvol_srcu, index); | |
2482 | return 0; | |
2483 | } | |
2484 | ||
2485 | srcu_read_unlock(&fs_info->subvol_srcu, index); | |
2486 | ||
2487 | /* step 3: relink backref */ | |
2488 | lock_start = backref->file_pos; | |
2489 | lock_end = backref->file_pos + backref->num_bytes - 1; | |
2490 | lock_extent_bits(&BTRFS_I(inode)->io_tree, lock_start, lock_end, | |
ff13db41 | 2491 | &cached); |
38c227d8 LB |
2492 | |
2493 | ordered = btrfs_lookup_first_ordered_extent(inode, lock_end); | |
2494 | if (ordered) { | |
2495 | btrfs_put_ordered_extent(ordered); | |
2496 | goto out_unlock; | |
2497 | } | |
2498 | ||
2499 | trans = btrfs_join_transaction(root); | |
2500 | if (IS_ERR(trans)) { | |
2501 | ret = PTR_ERR(trans); | |
2502 | goto out_unlock; | |
2503 | } | |
2504 | ||
2505 | key.objectid = backref->inum; | |
2506 | key.type = BTRFS_EXTENT_DATA_KEY; | |
2507 | key.offset = backref->file_pos; | |
2508 | ||
2509 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); | |
2510 | if (ret < 0) { | |
2511 | goto out_free_path; | |
2512 | } else if (ret > 0) { | |
2513 | ret = 0; | |
2514 | goto out_free_path; | |
2515 | } | |
2516 | ||
2517 | extent = btrfs_item_ptr(path->nodes[0], path->slots[0], | |
2518 | struct btrfs_file_extent_item); | |
2519 | ||
2520 | if (btrfs_file_extent_generation(path->nodes[0], extent) != | |
2521 | backref->generation) | |
2522 | goto out_free_path; | |
2523 | ||
2524 | btrfs_release_path(path); | |
2525 | ||
2526 | start = backref->file_pos; | |
2527 | if (backref->extent_offset < old->extent_offset + old->offset) | |
2528 | start += old->extent_offset + old->offset - | |
2529 | backref->extent_offset; | |
2530 | ||
2531 | len = min(backref->extent_offset + backref->num_bytes, | |
2532 | old->extent_offset + old->offset + old->len); | |
2533 | len -= max(backref->extent_offset, old->extent_offset + old->offset); | |
2534 | ||
2535 | ret = btrfs_drop_extents(trans, root, inode, start, | |
2536 | start + len, 1); | |
2537 | if (ret) | |
2538 | goto out_free_path; | |
2539 | again: | |
2540 | key.objectid = btrfs_ino(inode); | |
2541 | key.type = BTRFS_EXTENT_DATA_KEY; | |
2542 | key.offset = start; | |
2543 | ||
a09a0a70 | 2544 | path->leave_spinning = 1; |
38c227d8 LB |
2545 | if (merge) { |
2546 | struct btrfs_file_extent_item *fi; | |
2547 | u64 extent_len; | |
2548 | struct btrfs_key found_key; | |
2549 | ||
3c9665df | 2550 | ret = btrfs_search_slot(trans, root, &key, path, 0, 1); |
38c227d8 LB |
2551 | if (ret < 0) |
2552 | goto out_free_path; | |
2553 | ||
2554 | path->slots[0]--; | |
2555 | leaf = path->nodes[0]; | |
2556 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); | |
2557 | ||
2558 | fi = btrfs_item_ptr(leaf, path->slots[0], | |
2559 | struct btrfs_file_extent_item); | |
2560 | extent_len = btrfs_file_extent_num_bytes(leaf, fi); | |
2561 | ||
116e0024 LB |
2562 | if (extent_len + found_key.offset == start && |
2563 | relink_is_mergable(leaf, fi, new)) { | |
38c227d8 LB |
2564 | btrfs_set_file_extent_num_bytes(leaf, fi, |
2565 | extent_len + len); | |
2566 | btrfs_mark_buffer_dirty(leaf); | |
2567 | inode_add_bytes(inode, len); | |
2568 | ||
2569 | ret = 1; | |
2570 | goto out_free_path; | |
2571 | } else { | |
2572 | merge = false; | |
2573 | btrfs_release_path(path); | |
2574 | goto again; | |
2575 | } | |
2576 | } | |
2577 | ||
2578 | ret = btrfs_insert_empty_item(trans, root, path, &key, | |
2579 | sizeof(*extent)); | |
2580 | if (ret) { | |
2581 | btrfs_abort_transaction(trans, root, ret); | |
2582 | goto out_free_path; | |
2583 | } | |
2584 | ||
2585 | leaf = path->nodes[0]; | |
2586 | item = btrfs_item_ptr(leaf, path->slots[0], | |
2587 | struct btrfs_file_extent_item); | |
2588 | btrfs_set_file_extent_disk_bytenr(leaf, item, new->bytenr); | |
2589 | btrfs_set_file_extent_disk_num_bytes(leaf, item, new->disk_len); | |
2590 | btrfs_set_file_extent_offset(leaf, item, start - new->file_pos); | |
2591 | btrfs_set_file_extent_num_bytes(leaf, item, len); | |
2592 | btrfs_set_file_extent_ram_bytes(leaf, item, new->len); | |
2593 | btrfs_set_file_extent_generation(leaf, item, trans->transid); | |
2594 | btrfs_set_file_extent_type(leaf, item, BTRFS_FILE_EXTENT_REG); | |
2595 | btrfs_set_file_extent_compression(leaf, item, new->compress_type); | |
2596 | btrfs_set_file_extent_encryption(leaf, item, 0); | |
2597 | btrfs_set_file_extent_other_encoding(leaf, item, 0); | |
2598 | ||
2599 | btrfs_mark_buffer_dirty(leaf); | |
2600 | inode_add_bytes(inode, len); | |
a09a0a70 | 2601 | btrfs_release_path(path); |
38c227d8 LB |
2602 | |
2603 | ret = btrfs_inc_extent_ref(trans, root, new->bytenr, | |
2604 | new->disk_len, 0, | |
2605 | backref->root_id, backref->inum, | |
b06c4bf5 | 2606 | new->file_pos); /* start - extent_offset */ |
38c227d8 LB |
2607 | if (ret) { |
2608 | btrfs_abort_transaction(trans, root, ret); | |
2609 | goto out_free_path; | |
2610 | } | |
2611 | ||
2612 | ret = 1; | |
2613 | out_free_path: | |
2614 | btrfs_release_path(path); | |
a09a0a70 | 2615 | path->leave_spinning = 0; |
38c227d8 LB |
2616 | btrfs_end_transaction(trans, root); |
2617 | out_unlock: | |
2618 | unlock_extent_cached(&BTRFS_I(inode)->io_tree, lock_start, lock_end, | |
2619 | &cached, GFP_NOFS); | |
2620 | iput(inode); | |
2621 | return ret; | |
2622 | } | |
2623 | ||
6f519564 LB |
2624 | static void free_sa_defrag_extent(struct new_sa_defrag_extent *new) |
2625 | { | |
2626 | struct old_sa_defrag_extent *old, *tmp; | |
2627 | ||
2628 | if (!new) | |
2629 | return; | |
2630 | ||
2631 | list_for_each_entry_safe(old, tmp, &new->head, list) { | |
6f519564 LB |
2632 | kfree(old); |
2633 | } | |
2634 | kfree(new); | |
2635 | } | |
2636 | ||
38c227d8 LB |
2637 | static void relink_file_extents(struct new_sa_defrag_extent *new) |
2638 | { | |
2639 | struct btrfs_path *path; | |
38c227d8 LB |
2640 | struct sa_defrag_extent_backref *backref; |
2641 | struct sa_defrag_extent_backref *prev = NULL; | |
2642 | struct inode *inode; | |
2643 | struct btrfs_root *root; | |
2644 | struct rb_node *node; | |
2645 | int ret; | |
2646 | ||
2647 | inode = new->inode; | |
2648 | root = BTRFS_I(inode)->root; | |
2649 | ||
2650 | path = btrfs_alloc_path(); | |
2651 | if (!path) | |
2652 | return; | |
2653 | ||
2654 | if (!record_extent_backrefs(path, new)) { | |
2655 | btrfs_free_path(path); | |
2656 | goto out; | |
2657 | } | |
2658 | btrfs_release_path(path); | |
2659 | ||
2660 | while (1) { | |
2661 | node = rb_first(&new->root); | |
2662 | if (!node) | |
2663 | break; | |
2664 | rb_erase(node, &new->root); | |
2665 | ||
2666 | backref = rb_entry(node, struct sa_defrag_extent_backref, node); | |
2667 | ||
2668 | ret = relink_extent_backref(path, prev, backref); | |
2669 | WARN_ON(ret < 0); | |
2670 | ||
2671 | kfree(prev); | |
2672 | ||
2673 | if (ret == 1) | |
2674 | prev = backref; | |
2675 | else | |
2676 | prev = NULL; | |
2677 | cond_resched(); | |
2678 | } | |
2679 | kfree(prev); | |
2680 | ||
2681 | btrfs_free_path(path); | |
38c227d8 | 2682 | out: |
6f519564 LB |
2683 | free_sa_defrag_extent(new); |
2684 | ||
38c227d8 LB |
2685 | atomic_dec(&root->fs_info->defrag_running); |
2686 | wake_up(&root->fs_info->transaction_wait); | |
38c227d8 LB |
2687 | } |
2688 | ||
2689 | static struct new_sa_defrag_extent * | |
2690 | record_old_file_extents(struct inode *inode, | |
2691 | struct btrfs_ordered_extent *ordered) | |
2692 | { | |
2693 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
2694 | struct btrfs_path *path; | |
2695 | struct btrfs_key key; | |
6f519564 | 2696 | struct old_sa_defrag_extent *old; |
38c227d8 LB |
2697 | struct new_sa_defrag_extent *new; |
2698 | int ret; | |
2699 | ||
2700 | new = kmalloc(sizeof(*new), GFP_NOFS); | |
2701 | if (!new) | |
2702 | return NULL; | |
2703 | ||
2704 | new->inode = inode; | |
2705 | new->file_pos = ordered->file_offset; | |
2706 | new->len = ordered->len; | |
2707 | new->bytenr = ordered->start; | |
2708 | new->disk_len = ordered->disk_len; | |
2709 | new->compress_type = ordered->compress_type; | |
2710 | new->root = RB_ROOT; | |
2711 | INIT_LIST_HEAD(&new->head); | |
2712 | ||
2713 | path = btrfs_alloc_path(); | |
2714 | if (!path) | |
2715 | goto out_kfree; | |
2716 | ||
2717 | key.objectid = btrfs_ino(inode); | |
2718 | key.type = BTRFS_EXTENT_DATA_KEY; | |
2719 | key.offset = new->file_pos; | |
2720 | ||
2721 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); | |
2722 | if (ret < 0) | |
2723 | goto out_free_path; | |
2724 | if (ret > 0 && path->slots[0] > 0) | |
2725 | path->slots[0]--; | |
2726 | ||
2727 | /* find out all the old extents for the file range */ | |
2728 | while (1) { | |
2729 | struct btrfs_file_extent_item *extent; | |
2730 | struct extent_buffer *l; | |
2731 | int slot; | |
2732 | u64 num_bytes; | |
2733 | u64 offset; | |
2734 | u64 end; | |
2735 | u64 disk_bytenr; | |
2736 | u64 extent_offset; | |
2737 | ||
2738 | l = path->nodes[0]; | |
2739 | slot = path->slots[0]; | |
2740 | ||
2741 | if (slot >= btrfs_header_nritems(l)) { | |
2742 | ret = btrfs_next_leaf(root, path); | |
2743 | if (ret < 0) | |
6f519564 | 2744 | goto out_free_path; |
38c227d8 LB |
2745 | else if (ret > 0) |
2746 | break; | |
2747 | continue; | |
2748 | } | |
2749 | ||
2750 | btrfs_item_key_to_cpu(l, &key, slot); | |
2751 | ||
2752 | if (key.objectid != btrfs_ino(inode)) | |
2753 | break; | |
2754 | if (key.type != BTRFS_EXTENT_DATA_KEY) | |
2755 | break; | |
2756 | if (key.offset >= new->file_pos + new->len) | |
2757 | break; | |
2758 | ||
2759 | extent = btrfs_item_ptr(l, slot, struct btrfs_file_extent_item); | |
2760 | ||
2761 | num_bytes = btrfs_file_extent_num_bytes(l, extent); | |
2762 | if (key.offset + num_bytes < new->file_pos) | |
2763 | goto next; | |
2764 | ||
2765 | disk_bytenr = btrfs_file_extent_disk_bytenr(l, extent); | |
2766 | if (!disk_bytenr) | |
2767 | goto next; | |
2768 | ||
2769 | extent_offset = btrfs_file_extent_offset(l, extent); | |
2770 | ||
2771 | old = kmalloc(sizeof(*old), GFP_NOFS); | |
2772 | if (!old) | |
6f519564 | 2773 | goto out_free_path; |
38c227d8 LB |
2774 | |
2775 | offset = max(new->file_pos, key.offset); | |
2776 | end = min(new->file_pos + new->len, key.offset + num_bytes); | |
2777 | ||
2778 | old->bytenr = disk_bytenr; | |
2779 | old->extent_offset = extent_offset; | |
2780 | old->offset = offset - key.offset; | |
2781 | old->len = end - offset; | |
2782 | old->new = new; | |
2783 | old->count = 0; | |
2784 | list_add_tail(&old->list, &new->head); | |
2785 | next: | |
2786 | path->slots[0]++; | |
2787 | cond_resched(); | |
2788 | } | |
2789 | ||
2790 | btrfs_free_path(path); | |
2791 | atomic_inc(&root->fs_info->defrag_running); | |
2792 | ||
2793 | return new; | |
2794 | ||
38c227d8 LB |
2795 | out_free_path: |
2796 | btrfs_free_path(path); | |
2797 | out_kfree: | |
6f519564 | 2798 | free_sa_defrag_extent(new); |
38c227d8 LB |
2799 | return NULL; |
2800 | } | |
2801 | ||
e570fd27 MX |
2802 | static void btrfs_release_delalloc_bytes(struct btrfs_root *root, |
2803 | u64 start, u64 len) | |
2804 | { | |
2805 | struct btrfs_block_group_cache *cache; | |
2806 | ||
2807 | cache = btrfs_lookup_block_group(root->fs_info, start); | |
2808 | ASSERT(cache); | |
2809 | ||
2810 | spin_lock(&cache->lock); | |
2811 | cache->delalloc_bytes -= len; | |
2812 | spin_unlock(&cache->lock); | |
2813 | ||
2814 | btrfs_put_block_group(cache); | |
2815 | } | |
2816 | ||
d352ac68 CM |
2817 | /* as ordered data IO finishes, this gets called so we can finish |
2818 | * an ordered extent if the range of bytes in the file it covers are | |
2819 | * fully written. | |
2820 | */ | |
5fd02043 | 2821 | static int btrfs_finish_ordered_io(struct btrfs_ordered_extent *ordered_extent) |
e6dcd2dc | 2822 | { |
5fd02043 | 2823 | struct inode *inode = ordered_extent->inode; |
e6dcd2dc | 2824 | struct btrfs_root *root = BTRFS_I(inode)->root; |
0ca1f7ce | 2825 | struct btrfs_trans_handle *trans = NULL; |
e6dcd2dc | 2826 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; |
2ac55d41 | 2827 | struct extent_state *cached_state = NULL; |
38c227d8 | 2828 | struct new_sa_defrag_extent *new = NULL; |
261507a0 | 2829 | int compress_type = 0; |
77cef2ec JB |
2830 | int ret = 0; |
2831 | u64 logical_len = ordered_extent->len; | |
82d5902d | 2832 | bool nolock; |
77cef2ec | 2833 | bool truncated = false; |
e6dcd2dc | 2834 | |
83eea1f1 | 2835 | nolock = btrfs_is_free_space_inode(inode); |
0cb59c99 | 2836 | |
5fd02043 JB |
2837 | if (test_bit(BTRFS_ORDERED_IOERR, &ordered_extent->flags)) { |
2838 | ret = -EIO; | |
2839 | goto out; | |
2840 | } | |
2841 | ||
f612496b MX |
2842 | btrfs_free_io_failure_record(inode, ordered_extent->file_offset, |
2843 | ordered_extent->file_offset + | |
2844 | ordered_extent->len - 1); | |
2845 | ||
77cef2ec JB |
2846 | if (test_bit(BTRFS_ORDERED_TRUNCATED, &ordered_extent->flags)) { |
2847 | truncated = true; | |
2848 | logical_len = ordered_extent->truncated_len; | |
2849 | /* Truncated the entire extent, don't bother adding */ | |
2850 | if (!logical_len) | |
2851 | goto out; | |
2852 | } | |
2853 | ||
c2167754 | 2854 | if (test_bit(BTRFS_ORDERED_NOCOW, &ordered_extent->flags)) { |
79787eaa | 2855 | BUG_ON(!list_empty(&ordered_extent->list)); /* Logic error */ |
94ed938a QW |
2856 | |
2857 | /* | |
2858 | * For mwrite(mmap + memset to write) case, we still reserve | |
2859 | * space for NOCOW range. | |
2860 | * As NOCOW won't cause a new delayed ref, just free the space | |
2861 | */ | |
2862 | btrfs_qgroup_free_data(inode, ordered_extent->file_offset, | |
2863 | ordered_extent->len); | |
6c760c07 JB |
2864 | btrfs_ordered_update_i_size(inode, 0, ordered_extent); |
2865 | if (nolock) | |
2866 | trans = btrfs_join_transaction_nolock(root); | |
2867 | else | |
2868 | trans = btrfs_join_transaction(root); | |
2869 | if (IS_ERR(trans)) { | |
2870 | ret = PTR_ERR(trans); | |
2871 | trans = NULL; | |
2872 | goto out; | |
c2167754 | 2873 | } |
6c760c07 JB |
2874 | trans->block_rsv = &root->fs_info->delalloc_block_rsv; |
2875 | ret = btrfs_update_inode_fallback(trans, root, inode); | |
2876 | if (ret) /* -ENOMEM or corruption */ | |
2877 | btrfs_abort_transaction(trans, root, ret); | |
c2167754 YZ |
2878 | goto out; |
2879 | } | |
e6dcd2dc | 2880 | |
2ac55d41 JB |
2881 | lock_extent_bits(io_tree, ordered_extent->file_offset, |
2882 | ordered_extent->file_offset + ordered_extent->len - 1, | |
ff13db41 | 2883 | &cached_state); |
e6dcd2dc | 2884 | |
38c227d8 LB |
2885 | ret = test_range_bit(io_tree, ordered_extent->file_offset, |
2886 | ordered_extent->file_offset + ordered_extent->len - 1, | |
2887 | EXTENT_DEFRAG, 1, cached_state); | |
2888 | if (ret) { | |
2889 | u64 last_snapshot = btrfs_root_last_snapshot(&root->root_item); | |
8101c8db | 2890 | if (0 && last_snapshot >= BTRFS_I(inode)->generation) |
38c227d8 LB |
2891 | /* the inode is shared */ |
2892 | new = record_old_file_extents(inode, ordered_extent); | |
2893 | ||
2894 | clear_extent_bit(io_tree, ordered_extent->file_offset, | |
2895 | ordered_extent->file_offset + ordered_extent->len - 1, | |
2896 | EXTENT_DEFRAG, 0, 0, &cached_state, GFP_NOFS); | |
2897 | } | |
2898 | ||
0cb59c99 | 2899 | if (nolock) |
7a7eaa40 | 2900 | trans = btrfs_join_transaction_nolock(root); |
0cb59c99 | 2901 | else |
7a7eaa40 | 2902 | trans = btrfs_join_transaction(root); |
79787eaa JM |
2903 | if (IS_ERR(trans)) { |
2904 | ret = PTR_ERR(trans); | |
2905 | trans = NULL; | |
2906 | goto out_unlock; | |
2907 | } | |
a79b7d4b | 2908 | |
0ca1f7ce | 2909 | trans->block_rsv = &root->fs_info->delalloc_block_rsv; |
c2167754 | 2910 | |
c8b97818 | 2911 | if (test_bit(BTRFS_ORDERED_COMPRESSED, &ordered_extent->flags)) |
261507a0 | 2912 | compress_type = ordered_extent->compress_type; |
d899e052 | 2913 | if (test_bit(BTRFS_ORDERED_PREALLOC, &ordered_extent->flags)) { |
261507a0 | 2914 | BUG_ON(compress_type); |
920bbbfb | 2915 | ret = btrfs_mark_extent_written(trans, inode, |
d899e052 YZ |
2916 | ordered_extent->file_offset, |
2917 | ordered_extent->file_offset + | |
77cef2ec | 2918 | logical_len); |
d899e052 | 2919 | } else { |
0af3d00b | 2920 | BUG_ON(root == root->fs_info->tree_root); |
d899e052 YZ |
2921 | ret = insert_reserved_file_extent(trans, inode, |
2922 | ordered_extent->file_offset, | |
2923 | ordered_extent->start, | |
2924 | ordered_extent->disk_len, | |
77cef2ec | 2925 | logical_len, logical_len, |
261507a0 | 2926 | compress_type, 0, 0, |
d899e052 | 2927 | BTRFS_FILE_EXTENT_REG); |
e570fd27 MX |
2928 | if (!ret) |
2929 | btrfs_release_delalloc_bytes(root, | |
2930 | ordered_extent->start, | |
2931 | ordered_extent->disk_len); | |
d899e052 | 2932 | } |
5dc562c5 JB |
2933 | unpin_extent_cache(&BTRFS_I(inode)->extent_tree, |
2934 | ordered_extent->file_offset, ordered_extent->len, | |
2935 | trans->transid); | |
79787eaa JM |
2936 | if (ret < 0) { |
2937 | btrfs_abort_transaction(trans, root, ret); | |
5fd02043 | 2938 | goto out_unlock; |
79787eaa | 2939 | } |
2ac55d41 | 2940 | |
e6dcd2dc CM |
2941 | add_pending_csums(trans, inode, ordered_extent->file_offset, |
2942 | &ordered_extent->list); | |
2943 | ||
6c760c07 JB |
2944 | btrfs_ordered_update_i_size(inode, 0, ordered_extent); |
2945 | ret = btrfs_update_inode_fallback(trans, root, inode); | |
2946 | if (ret) { /* -ENOMEM or corruption */ | |
2947 | btrfs_abort_transaction(trans, root, ret); | |
2948 | goto out_unlock; | |
1ef30be1 JB |
2949 | } |
2950 | ret = 0; | |
5fd02043 JB |
2951 | out_unlock: |
2952 | unlock_extent_cached(io_tree, ordered_extent->file_offset, | |
2953 | ordered_extent->file_offset + | |
2954 | ordered_extent->len - 1, &cached_state, GFP_NOFS); | |
c2167754 | 2955 | out: |
5b0e95bf | 2956 | if (root != root->fs_info->tree_root) |
0cb59c99 | 2957 | btrfs_delalloc_release_metadata(inode, ordered_extent->len); |
a698d075 MX |
2958 | if (trans) |
2959 | btrfs_end_transaction(trans, root); | |
0cb59c99 | 2960 | |
77cef2ec JB |
2961 | if (ret || truncated) { |
2962 | u64 start, end; | |
2963 | ||
2964 | if (truncated) | |
2965 | start = ordered_extent->file_offset + logical_len; | |
2966 | else | |
2967 | start = ordered_extent->file_offset; | |
2968 | end = ordered_extent->file_offset + ordered_extent->len - 1; | |
2969 | clear_extent_uptodate(io_tree, start, end, NULL, GFP_NOFS); | |
2970 | ||
2971 | /* Drop the cache for the part of the extent we didn't write. */ | |
2972 | btrfs_drop_extent_cache(inode, start, end, 0); | |
5fd02043 | 2973 | |
0bec9ef5 JB |
2974 | /* |
2975 | * If the ordered extent had an IOERR or something else went | |
2976 | * wrong we need to return the space for this ordered extent | |
77cef2ec JB |
2977 | * back to the allocator. We only free the extent in the |
2978 | * truncated case if we didn't write out the extent at all. | |
0bec9ef5 | 2979 | */ |
77cef2ec JB |
2980 | if ((ret || !logical_len) && |
2981 | !test_bit(BTRFS_ORDERED_NOCOW, &ordered_extent->flags) && | |
0bec9ef5 JB |
2982 | !test_bit(BTRFS_ORDERED_PREALLOC, &ordered_extent->flags)) |
2983 | btrfs_free_reserved_extent(root, ordered_extent->start, | |
e570fd27 | 2984 | ordered_extent->disk_len, 1); |
0bec9ef5 JB |
2985 | } |
2986 | ||
2987 | ||
5fd02043 | 2988 | /* |
8bad3c02 LB |
2989 | * This needs to be done to make sure anybody waiting knows we are done |
2990 | * updating everything for this ordered extent. | |
5fd02043 JB |
2991 | */ |
2992 | btrfs_remove_ordered_extent(inode, ordered_extent); | |
2993 | ||
38c227d8 | 2994 | /* for snapshot-aware defrag */ |
6f519564 LB |
2995 | if (new) { |
2996 | if (ret) { | |
2997 | free_sa_defrag_extent(new); | |
2998 | atomic_dec(&root->fs_info->defrag_running); | |
2999 | } else { | |
3000 | relink_file_extents(new); | |
3001 | } | |
3002 | } | |
38c227d8 | 3003 | |
e6dcd2dc CM |
3004 | /* once for us */ |
3005 | btrfs_put_ordered_extent(ordered_extent); | |
3006 | /* once for the tree */ | |
3007 | btrfs_put_ordered_extent(ordered_extent); | |
3008 | ||
5fd02043 JB |
3009 | return ret; |
3010 | } | |
3011 | ||
3012 | static void finish_ordered_fn(struct btrfs_work *work) | |
3013 | { | |
3014 | struct btrfs_ordered_extent *ordered_extent; | |
3015 | ordered_extent = container_of(work, struct btrfs_ordered_extent, work); | |
3016 | btrfs_finish_ordered_io(ordered_extent); | |
e6dcd2dc CM |
3017 | } |
3018 | ||
b2950863 | 3019 | static int btrfs_writepage_end_io_hook(struct page *page, u64 start, u64 end, |
211f90e6 CM |
3020 | struct extent_state *state, int uptodate) |
3021 | { | |
5fd02043 JB |
3022 | struct inode *inode = page->mapping->host; |
3023 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
3024 | struct btrfs_ordered_extent *ordered_extent = NULL; | |
9e0af237 LB |
3025 | struct btrfs_workqueue *wq; |
3026 | btrfs_work_func_t func; | |
5fd02043 | 3027 | |
1abe9b8a | 3028 | trace_btrfs_writepage_end_io_hook(page, start, end, uptodate); |
3029 | ||
8b62b72b | 3030 | ClearPagePrivate2(page); |
5fd02043 JB |
3031 | if (!btrfs_dec_test_ordered_pending(inode, &ordered_extent, start, |
3032 | end - start + 1, uptodate)) | |
3033 | return 0; | |
3034 | ||
9e0af237 LB |
3035 | if (btrfs_is_free_space_inode(inode)) { |
3036 | wq = root->fs_info->endio_freespace_worker; | |
3037 | func = btrfs_freespace_write_helper; | |
3038 | } else { | |
3039 | wq = root->fs_info->endio_write_workers; | |
3040 | func = btrfs_endio_write_helper; | |
3041 | } | |
5fd02043 | 3042 | |
9e0af237 LB |
3043 | btrfs_init_work(&ordered_extent->work, func, finish_ordered_fn, NULL, |
3044 | NULL); | |
3045 | btrfs_queue_work(wq, &ordered_extent->work); | |
5fd02043 JB |
3046 | |
3047 | return 0; | |
211f90e6 CM |
3048 | } |
3049 | ||
dc380aea MX |
3050 | static int __readpage_endio_check(struct inode *inode, |
3051 | struct btrfs_io_bio *io_bio, | |
3052 | int icsum, struct page *page, | |
3053 | int pgoff, u64 start, size_t len) | |
3054 | { | |
3055 | char *kaddr; | |
3056 | u32 csum_expected; | |
3057 | u32 csum = ~(u32)0; | |
dc380aea MX |
3058 | |
3059 | csum_expected = *(((u32 *)io_bio->csum) + icsum); | |
3060 | ||
3061 | kaddr = kmap_atomic(page); | |
3062 | csum = btrfs_csum_data(kaddr + pgoff, csum, len); | |
3063 | btrfs_csum_final(csum, (char *)&csum); | |
3064 | if (csum != csum_expected) | |
3065 | goto zeroit; | |
3066 | ||
3067 | kunmap_atomic(kaddr); | |
3068 | return 0; | |
3069 | zeroit: | |
94647322 DS |
3070 | btrfs_warn_rl(BTRFS_I(inode)->root->fs_info, |
3071 | "csum failed ino %llu off %llu csum %u expected csum %u", | |
dc380aea MX |
3072 | btrfs_ino(inode), start, csum, csum_expected); |
3073 | memset(kaddr + pgoff, 1, len); | |
3074 | flush_dcache_page(page); | |
3075 | kunmap_atomic(kaddr); | |
3076 | if (csum_expected == 0) | |
3077 | return 0; | |
3078 | return -EIO; | |
3079 | } | |
3080 | ||
d352ac68 CM |
3081 | /* |
3082 | * when reads are done, we need to check csums to verify the data is correct | |
4a54c8c1 JS |
3083 | * if there's a match, we allow the bio to finish. If not, the code in |
3084 | * extent_io.c will try to find good copies for us. | |
d352ac68 | 3085 | */ |
facc8a22 MX |
3086 | static int btrfs_readpage_end_io_hook(struct btrfs_io_bio *io_bio, |
3087 | u64 phy_offset, struct page *page, | |
3088 | u64 start, u64 end, int mirror) | |
07157aac | 3089 | { |
4eee4fa4 | 3090 | size_t offset = start - page_offset(page); |
07157aac | 3091 | struct inode *inode = page->mapping->host; |
d1310b2e | 3092 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; |
ff79f819 | 3093 | struct btrfs_root *root = BTRFS_I(inode)->root; |
d1310b2e | 3094 | |
d20f7043 CM |
3095 | if (PageChecked(page)) { |
3096 | ClearPageChecked(page); | |
dc380aea | 3097 | return 0; |
d20f7043 | 3098 | } |
6cbff00f CH |
3099 | |
3100 | if (BTRFS_I(inode)->flags & BTRFS_INODE_NODATASUM) | |
dc380aea | 3101 | return 0; |
17d217fe YZ |
3102 | |
3103 | if (root->root_key.objectid == BTRFS_DATA_RELOC_TREE_OBJECTID && | |
9655d298 | 3104 | test_range_bit(io_tree, start, end, EXTENT_NODATASUM, 1, NULL)) { |
17d217fe YZ |
3105 | clear_extent_bits(io_tree, start, end, EXTENT_NODATASUM, |
3106 | GFP_NOFS); | |
b6cda9bc | 3107 | return 0; |
17d217fe | 3108 | } |
d20f7043 | 3109 | |
facc8a22 | 3110 | phy_offset >>= inode->i_sb->s_blocksize_bits; |
dc380aea MX |
3111 | return __readpage_endio_check(inode, io_bio, phy_offset, page, offset, |
3112 | start, (size_t)(end - start + 1)); | |
07157aac | 3113 | } |
b888db2b | 3114 | |
24bbcf04 YZ |
3115 | void btrfs_add_delayed_iput(struct inode *inode) |
3116 | { | |
3117 | struct btrfs_fs_info *fs_info = BTRFS_I(inode)->root->fs_info; | |
8089fe62 | 3118 | struct btrfs_inode *binode = BTRFS_I(inode); |
24bbcf04 YZ |
3119 | |
3120 | if (atomic_add_unless(&inode->i_count, -1, 1)) | |
3121 | return; | |
3122 | ||
24bbcf04 | 3123 | spin_lock(&fs_info->delayed_iput_lock); |
8089fe62 DS |
3124 | if (binode->delayed_iput_count == 0) { |
3125 | ASSERT(list_empty(&binode->delayed_iput)); | |
3126 | list_add_tail(&binode->delayed_iput, &fs_info->delayed_iputs); | |
3127 | } else { | |
3128 | binode->delayed_iput_count++; | |
3129 | } | |
24bbcf04 YZ |
3130 | spin_unlock(&fs_info->delayed_iput_lock); |
3131 | } | |
3132 | ||
3133 | void btrfs_run_delayed_iputs(struct btrfs_root *root) | |
3134 | { | |
24bbcf04 | 3135 | struct btrfs_fs_info *fs_info = root->fs_info; |
24bbcf04 | 3136 | |
d7c15171 | 3137 | down_read(&fs_info->delayed_iput_sem); |
24bbcf04 | 3138 | spin_lock(&fs_info->delayed_iput_lock); |
8089fe62 DS |
3139 | while (!list_empty(&fs_info->delayed_iputs)) { |
3140 | struct btrfs_inode *inode; | |
3141 | ||
3142 | inode = list_first_entry(&fs_info->delayed_iputs, | |
3143 | struct btrfs_inode, delayed_iput); | |
3144 | if (inode->delayed_iput_count) { | |
3145 | inode->delayed_iput_count--; | |
3146 | list_move_tail(&inode->delayed_iput, | |
3147 | &fs_info->delayed_iputs); | |
3148 | } else { | |
3149 | list_del_init(&inode->delayed_iput); | |
3150 | } | |
3151 | spin_unlock(&fs_info->delayed_iput_lock); | |
3152 | iput(&inode->vfs_inode); | |
3153 | spin_lock(&fs_info->delayed_iput_lock); | |
24bbcf04 | 3154 | } |
8089fe62 | 3155 | spin_unlock(&fs_info->delayed_iput_lock); |
d7c15171 | 3156 | up_read(&root->fs_info->delayed_iput_sem); |
24bbcf04 YZ |
3157 | } |
3158 | ||
d68fc57b | 3159 | /* |
42b2aa86 | 3160 | * This is called in transaction commit time. If there are no orphan |
d68fc57b YZ |
3161 | * files in the subvolume, it removes orphan item and frees block_rsv |
3162 | * structure. | |
3163 | */ | |
3164 | void btrfs_orphan_commit_root(struct btrfs_trans_handle *trans, | |
3165 | struct btrfs_root *root) | |
3166 | { | |
90290e19 | 3167 | struct btrfs_block_rsv *block_rsv; |
d68fc57b YZ |
3168 | int ret; |
3169 | ||
8a35d95f | 3170 | if (atomic_read(&root->orphan_inodes) || |
d68fc57b YZ |
3171 | root->orphan_cleanup_state != ORPHAN_CLEANUP_DONE) |
3172 | return; | |
3173 | ||
90290e19 | 3174 | spin_lock(&root->orphan_lock); |
8a35d95f | 3175 | if (atomic_read(&root->orphan_inodes)) { |
90290e19 JB |
3176 | spin_unlock(&root->orphan_lock); |
3177 | return; | |
3178 | } | |
3179 | ||
3180 | if (root->orphan_cleanup_state != ORPHAN_CLEANUP_DONE) { | |
3181 | spin_unlock(&root->orphan_lock); | |
3182 | return; | |
3183 | } | |
3184 | ||
3185 | block_rsv = root->orphan_block_rsv; | |
3186 | root->orphan_block_rsv = NULL; | |
3187 | spin_unlock(&root->orphan_lock); | |
3188 | ||
27cdeb70 | 3189 | if (test_bit(BTRFS_ROOT_ORPHAN_ITEM_INSERTED, &root->state) && |
d68fc57b YZ |
3190 | btrfs_root_refs(&root->root_item) > 0) { |
3191 | ret = btrfs_del_orphan_item(trans, root->fs_info->tree_root, | |
3192 | root->root_key.objectid); | |
4ef31a45 JB |
3193 | if (ret) |
3194 | btrfs_abort_transaction(trans, root, ret); | |
3195 | else | |
27cdeb70 MX |
3196 | clear_bit(BTRFS_ROOT_ORPHAN_ITEM_INSERTED, |
3197 | &root->state); | |
d68fc57b YZ |
3198 | } |
3199 | ||
90290e19 JB |
3200 | if (block_rsv) { |
3201 | WARN_ON(block_rsv->size > 0); | |
3202 | btrfs_free_block_rsv(root, block_rsv); | |
d68fc57b YZ |
3203 | } |
3204 | } | |
3205 | ||
7b128766 JB |
3206 | /* |
3207 | * This creates an orphan entry for the given inode in case something goes | |
3208 | * wrong in the middle of an unlink/truncate. | |
d68fc57b YZ |
3209 | * |
3210 | * NOTE: caller of this function should reserve 5 units of metadata for | |
3211 | * this function. | |
7b128766 JB |
3212 | */ |
3213 | int btrfs_orphan_add(struct btrfs_trans_handle *trans, struct inode *inode) | |
3214 | { | |
3215 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
d68fc57b YZ |
3216 | struct btrfs_block_rsv *block_rsv = NULL; |
3217 | int reserve = 0; | |
3218 | int insert = 0; | |
3219 | int ret; | |
7b128766 | 3220 | |
d68fc57b | 3221 | if (!root->orphan_block_rsv) { |
66d8f3dd | 3222 | block_rsv = btrfs_alloc_block_rsv(root, BTRFS_BLOCK_RSV_TEMP); |
b532402e TI |
3223 | if (!block_rsv) |
3224 | return -ENOMEM; | |
d68fc57b | 3225 | } |
7b128766 | 3226 | |
d68fc57b YZ |
3227 | spin_lock(&root->orphan_lock); |
3228 | if (!root->orphan_block_rsv) { | |
3229 | root->orphan_block_rsv = block_rsv; | |
3230 | } else if (block_rsv) { | |
3231 | btrfs_free_block_rsv(root, block_rsv); | |
3232 | block_rsv = NULL; | |
7b128766 | 3233 | } |
7b128766 | 3234 | |
8a35d95f JB |
3235 | if (!test_and_set_bit(BTRFS_INODE_HAS_ORPHAN_ITEM, |
3236 | &BTRFS_I(inode)->runtime_flags)) { | |
d68fc57b YZ |
3237 | #if 0 |
3238 | /* | |
3239 | * For proper ENOSPC handling, we should do orphan | |
3240 | * cleanup when mounting. But this introduces backward | |
3241 | * compatibility issue. | |
3242 | */ | |
3243 | if (!xchg(&root->orphan_item_inserted, 1)) | |
3244 | insert = 2; | |
3245 | else | |
3246 | insert = 1; | |
3247 | #endif | |
3248 | insert = 1; | |
321f0e70 | 3249 | atomic_inc(&root->orphan_inodes); |
7b128766 JB |
3250 | } |
3251 | ||
72ac3c0d JB |
3252 | if (!test_and_set_bit(BTRFS_INODE_ORPHAN_META_RESERVED, |
3253 | &BTRFS_I(inode)->runtime_flags)) | |
d68fc57b | 3254 | reserve = 1; |
d68fc57b | 3255 | spin_unlock(&root->orphan_lock); |
7b128766 | 3256 | |
d68fc57b YZ |
3257 | /* grab metadata reservation from transaction handle */ |
3258 | if (reserve) { | |
3259 | ret = btrfs_orphan_reserve_metadata(trans, inode); | |
79787eaa | 3260 | BUG_ON(ret); /* -ENOSPC in reservation; Logic error? JDM */ |
d68fc57b | 3261 | } |
7b128766 | 3262 | |
d68fc57b YZ |
3263 | /* insert an orphan item to track this unlinked/truncated file */ |
3264 | if (insert >= 1) { | |
33345d01 | 3265 | ret = btrfs_insert_orphan_item(trans, root, btrfs_ino(inode)); |
4ef31a45 | 3266 | if (ret) { |
703c88e0 | 3267 | atomic_dec(&root->orphan_inodes); |
4ef31a45 JB |
3268 | if (reserve) { |
3269 | clear_bit(BTRFS_INODE_ORPHAN_META_RESERVED, | |
3270 | &BTRFS_I(inode)->runtime_flags); | |
3271 | btrfs_orphan_release_metadata(inode); | |
3272 | } | |
3273 | if (ret != -EEXIST) { | |
e8e7cff6 JB |
3274 | clear_bit(BTRFS_INODE_HAS_ORPHAN_ITEM, |
3275 | &BTRFS_I(inode)->runtime_flags); | |
4ef31a45 JB |
3276 | btrfs_abort_transaction(trans, root, ret); |
3277 | return ret; | |
3278 | } | |
79787eaa JM |
3279 | } |
3280 | ret = 0; | |
d68fc57b YZ |
3281 | } |
3282 | ||
3283 | /* insert an orphan item to track subvolume contains orphan files */ | |
3284 | if (insert >= 2) { | |
3285 | ret = btrfs_insert_orphan_item(trans, root->fs_info->tree_root, | |
3286 | root->root_key.objectid); | |
79787eaa JM |
3287 | if (ret && ret != -EEXIST) { |
3288 | btrfs_abort_transaction(trans, root, ret); | |
3289 | return ret; | |
3290 | } | |
d68fc57b YZ |
3291 | } |
3292 | return 0; | |
7b128766 JB |
3293 | } |
3294 | ||
3295 | /* | |
3296 | * We have done the truncate/delete so we can go ahead and remove the orphan | |
3297 | * item for this particular inode. | |
3298 | */ | |
48a3b636 ES |
3299 | static int btrfs_orphan_del(struct btrfs_trans_handle *trans, |
3300 | struct inode *inode) | |
7b128766 JB |
3301 | { |
3302 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
d68fc57b YZ |
3303 | int delete_item = 0; |
3304 | int release_rsv = 0; | |
7b128766 JB |
3305 | int ret = 0; |
3306 | ||
d68fc57b | 3307 | spin_lock(&root->orphan_lock); |
8a35d95f JB |
3308 | if (test_and_clear_bit(BTRFS_INODE_HAS_ORPHAN_ITEM, |
3309 | &BTRFS_I(inode)->runtime_flags)) | |
d68fc57b | 3310 | delete_item = 1; |
7b128766 | 3311 | |
72ac3c0d JB |
3312 | if (test_and_clear_bit(BTRFS_INODE_ORPHAN_META_RESERVED, |
3313 | &BTRFS_I(inode)->runtime_flags)) | |
d68fc57b | 3314 | release_rsv = 1; |
d68fc57b | 3315 | spin_unlock(&root->orphan_lock); |
7b128766 | 3316 | |
703c88e0 | 3317 | if (delete_item) { |
8a35d95f | 3318 | atomic_dec(&root->orphan_inodes); |
703c88e0 FDBM |
3319 | if (trans) |
3320 | ret = btrfs_del_orphan_item(trans, root, | |
3321 | btrfs_ino(inode)); | |
8a35d95f | 3322 | } |
7b128766 | 3323 | |
703c88e0 FDBM |
3324 | if (release_rsv) |
3325 | btrfs_orphan_release_metadata(inode); | |
3326 | ||
4ef31a45 | 3327 | return ret; |
7b128766 JB |
3328 | } |
3329 | ||
3330 | /* | |
3331 | * this cleans up any orphans that may be left on the list from the last use | |
3332 | * of this root. | |
3333 | */ | |
66b4ffd1 | 3334 | int btrfs_orphan_cleanup(struct btrfs_root *root) |
7b128766 JB |
3335 | { |
3336 | struct btrfs_path *path; | |
3337 | struct extent_buffer *leaf; | |
7b128766 JB |
3338 | struct btrfs_key key, found_key; |
3339 | struct btrfs_trans_handle *trans; | |
3340 | struct inode *inode; | |
8f6d7f4f | 3341 | u64 last_objectid = 0; |
7b128766 JB |
3342 | int ret = 0, nr_unlink = 0, nr_truncate = 0; |
3343 | ||
d68fc57b | 3344 | if (cmpxchg(&root->orphan_cleanup_state, 0, ORPHAN_CLEANUP_STARTED)) |
66b4ffd1 | 3345 | return 0; |
c71bf099 YZ |
3346 | |
3347 | path = btrfs_alloc_path(); | |
66b4ffd1 JB |
3348 | if (!path) { |
3349 | ret = -ENOMEM; | |
3350 | goto out; | |
3351 | } | |
e4058b54 | 3352 | path->reada = READA_BACK; |
7b128766 JB |
3353 | |
3354 | key.objectid = BTRFS_ORPHAN_OBJECTID; | |
962a298f | 3355 | key.type = BTRFS_ORPHAN_ITEM_KEY; |
7b128766 JB |
3356 | key.offset = (u64)-1; |
3357 | ||
7b128766 JB |
3358 | while (1) { |
3359 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); | |
66b4ffd1 JB |
3360 | if (ret < 0) |
3361 | goto out; | |
7b128766 JB |
3362 | |
3363 | /* | |
3364 | * if ret == 0 means we found what we were searching for, which | |
25985edc | 3365 | * is weird, but possible, so only screw with path if we didn't |
7b128766 JB |
3366 | * find the key and see if we have stuff that matches |
3367 | */ | |
3368 | if (ret > 0) { | |
66b4ffd1 | 3369 | ret = 0; |
7b128766 JB |
3370 | if (path->slots[0] == 0) |
3371 | break; | |
3372 | path->slots[0]--; | |
3373 | } | |
3374 | ||
3375 | /* pull out the item */ | |
3376 | leaf = path->nodes[0]; | |
7b128766 JB |
3377 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); |
3378 | ||
3379 | /* make sure the item matches what we want */ | |
3380 | if (found_key.objectid != BTRFS_ORPHAN_OBJECTID) | |
3381 | break; | |
962a298f | 3382 | if (found_key.type != BTRFS_ORPHAN_ITEM_KEY) |
7b128766 JB |
3383 | break; |
3384 | ||
3385 | /* release the path since we're done with it */ | |
b3b4aa74 | 3386 | btrfs_release_path(path); |
7b128766 JB |
3387 | |
3388 | /* | |
3389 | * this is where we are basically btrfs_lookup, without the | |
3390 | * crossing root thing. we store the inode number in the | |
3391 | * offset of the orphan item. | |
3392 | */ | |
8f6d7f4f JB |
3393 | |
3394 | if (found_key.offset == last_objectid) { | |
c2cf52eb SK |
3395 | btrfs_err(root->fs_info, |
3396 | "Error removing orphan entry, stopping orphan cleanup"); | |
8f6d7f4f JB |
3397 | ret = -EINVAL; |
3398 | goto out; | |
3399 | } | |
3400 | ||
3401 | last_objectid = found_key.offset; | |
3402 | ||
5d4f98a2 YZ |
3403 | found_key.objectid = found_key.offset; |
3404 | found_key.type = BTRFS_INODE_ITEM_KEY; | |
3405 | found_key.offset = 0; | |
73f73415 | 3406 | inode = btrfs_iget(root->fs_info->sb, &found_key, root, NULL); |
8c6ffba0 | 3407 | ret = PTR_ERR_OR_ZERO(inode); |
a8c9e576 | 3408 | if (ret && ret != -ESTALE) |
66b4ffd1 | 3409 | goto out; |
7b128766 | 3410 | |
f8e9e0b0 AJ |
3411 | if (ret == -ESTALE && root == root->fs_info->tree_root) { |
3412 | struct btrfs_root *dead_root; | |
3413 | struct btrfs_fs_info *fs_info = root->fs_info; | |
3414 | int is_dead_root = 0; | |
3415 | ||
3416 | /* | |
3417 | * this is an orphan in the tree root. Currently these | |
3418 | * could come from 2 sources: | |
3419 | * a) a snapshot deletion in progress | |
3420 | * b) a free space cache inode | |
3421 | * We need to distinguish those two, as the snapshot | |
3422 | * orphan must not get deleted. | |
3423 | * find_dead_roots already ran before us, so if this | |
3424 | * is a snapshot deletion, we should find the root | |
3425 | * in the dead_roots list | |
3426 | */ | |
3427 | spin_lock(&fs_info->trans_lock); | |
3428 | list_for_each_entry(dead_root, &fs_info->dead_roots, | |
3429 | root_list) { | |
3430 | if (dead_root->root_key.objectid == | |
3431 | found_key.objectid) { | |
3432 | is_dead_root = 1; | |
3433 | break; | |
3434 | } | |
3435 | } | |
3436 | spin_unlock(&fs_info->trans_lock); | |
3437 | if (is_dead_root) { | |
3438 | /* prevent this orphan from being found again */ | |
3439 | key.offset = found_key.objectid - 1; | |
3440 | continue; | |
3441 | } | |
3442 | } | |
7b128766 | 3443 | /* |
a8c9e576 JB |
3444 | * Inode is already gone but the orphan item is still there, |
3445 | * kill the orphan item. | |
7b128766 | 3446 | */ |
a8c9e576 JB |
3447 | if (ret == -ESTALE) { |
3448 | trans = btrfs_start_transaction(root, 1); | |
66b4ffd1 JB |
3449 | if (IS_ERR(trans)) { |
3450 | ret = PTR_ERR(trans); | |
3451 | goto out; | |
3452 | } | |
c2cf52eb SK |
3453 | btrfs_debug(root->fs_info, "auto deleting %Lu", |
3454 | found_key.objectid); | |
a8c9e576 JB |
3455 | ret = btrfs_del_orphan_item(trans, root, |
3456 | found_key.objectid); | |
5b21f2ed | 3457 | btrfs_end_transaction(trans, root); |
4ef31a45 JB |
3458 | if (ret) |
3459 | goto out; | |
7b128766 JB |
3460 | continue; |
3461 | } | |
3462 | ||
a8c9e576 JB |
3463 | /* |
3464 | * add this inode to the orphan list so btrfs_orphan_del does | |
3465 | * the proper thing when we hit it | |
3466 | */ | |
8a35d95f JB |
3467 | set_bit(BTRFS_INODE_HAS_ORPHAN_ITEM, |
3468 | &BTRFS_I(inode)->runtime_flags); | |
925396ec | 3469 | atomic_inc(&root->orphan_inodes); |
a8c9e576 | 3470 | |
7b128766 JB |
3471 | /* if we have links, this was a truncate, lets do that */ |
3472 | if (inode->i_nlink) { | |
fae7f21c | 3473 | if (WARN_ON(!S_ISREG(inode->i_mode))) { |
a41ad394 JB |
3474 | iput(inode); |
3475 | continue; | |
3476 | } | |
7b128766 | 3477 | nr_truncate++; |
f3fe820c JB |
3478 | |
3479 | /* 1 for the orphan item deletion. */ | |
3480 | trans = btrfs_start_transaction(root, 1); | |
3481 | if (IS_ERR(trans)) { | |
c69b26b0 | 3482 | iput(inode); |
f3fe820c JB |
3483 | ret = PTR_ERR(trans); |
3484 | goto out; | |
3485 | } | |
3486 | ret = btrfs_orphan_add(trans, inode); | |
3487 | btrfs_end_transaction(trans, root); | |
c69b26b0 JB |
3488 | if (ret) { |
3489 | iput(inode); | |
f3fe820c | 3490 | goto out; |
c69b26b0 | 3491 | } |
f3fe820c | 3492 | |
66b4ffd1 | 3493 | ret = btrfs_truncate(inode); |
4a7d0f68 JB |
3494 | if (ret) |
3495 | btrfs_orphan_del(NULL, inode); | |
7b128766 JB |
3496 | } else { |
3497 | nr_unlink++; | |
3498 | } | |
3499 | ||
3500 | /* this will do delete_inode and everything for us */ | |
3501 | iput(inode); | |
66b4ffd1 JB |
3502 | if (ret) |
3503 | goto out; | |
7b128766 | 3504 | } |
3254c876 MX |
3505 | /* release the path since we're done with it */ |
3506 | btrfs_release_path(path); | |
3507 | ||
d68fc57b YZ |
3508 | root->orphan_cleanup_state = ORPHAN_CLEANUP_DONE; |
3509 | ||
3510 | if (root->orphan_block_rsv) | |
3511 | btrfs_block_rsv_release(root, root->orphan_block_rsv, | |
3512 | (u64)-1); | |
3513 | ||
27cdeb70 MX |
3514 | if (root->orphan_block_rsv || |
3515 | test_bit(BTRFS_ROOT_ORPHAN_ITEM_INSERTED, &root->state)) { | |
7a7eaa40 | 3516 | trans = btrfs_join_transaction(root); |
66b4ffd1 JB |
3517 | if (!IS_ERR(trans)) |
3518 | btrfs_end_transaction(trans, root); | |
d68fc57b | 3519 | } |
7b128766 JB |
3520 | |
3521 | if (nr_unlink) | |
4884b476 | 3522 | btrfs_debug(root->fs_info, "unlinked %d orphans", nr_unlink); |
7b128766 | 3523 | if (nr_truncate) |
4884b476 | 3524 | btrfs_debug(root->fs_info, "truncated %d orphans", nr_truncate); |
66b4ffd1 JB |
3525 | |
3526 | out: | |
3527 | if (ret) | |
68b663d1 | 3528 | btrfs_err(root->fs_info, |
c2cf52eb | 3529 | "could not do orphan cleanup %d", ret); |
66b4ffd1 JB |
3530 | btrfs_free_path(path); |
3531 | return ret; | |
7b128766 JB |
3532 | } |
3533 | ||
46a53cca CM |
3534 | /* |
3535 | * very simple check to peek ahead in the leaf looking for xattrs. If we | |
3536 | * don't find any xattrs, we know there can't be any acls. | |
3537 | * | |
3538 | * slot is the slot the inode is in, objectid is the objectid of the inode | |
3539 | */ | |
3540 | static noinline int acls_after_inode_item(struct extent_buffer *leaf, | |
63541927 FDBM |
3541 | int slot, u64 objectid, |
3542 | int *first_xattr_slot) | |
46a53cca CM |
3543 | { |
3544 | u32 nritems = btrfs_header_nritems(leaf); | |
3545 | struct btrfs_key found_key; | |
f23b5a59 JB |
3546 | static u64 xattr_access = 0; |
3547 | static u64 xattr_default = 0; | |
46a53cca CM |
3548 | int scanned = 0; |
3549 | ||
f23b5a59 JB |
3550 | if (!xattr_access) { |
3551 | xattr_access = btrfs_name_hash(POSIX_ACL_XATTR_ACCESS, | |
3552 | strlen(POSIX_ACL_XATTR_ACCESS)); | |
3553 | xattr_default = btrfs_name_hash(POSIX_ACL_XATTR_DEFAULT, | |
3554 | strlen(POSIX_ACL_XATTR_DEFAULT)); | |
3555 | } | |
3556 | ||
46a53cca | 3557 | slot++; |
63541927 | 3558 | *first_xattr_slot = -1; |
46a53cca CM |
3559 | while (slot < nritems) { |
3560 | btrfs_item_key_to_cpu(leaf, &found_key, slot); | |
3561 | ||
3562 | /* we found a different objectid, there must not be acls */ | |
3563 | if (found_key.objectid != objectid) | |
3564 | return 0; | |
3565 | ||
3566 | /* we found an xattr, assume we've got an acl */ | |
f23b5a59 | 3567 | if (found_key.type == BTRFS_XATTR_ITEM_KEY) { |
63541927 FDBM |
3568 | if (*first_xattr_slot == -1) |
3569 | *first_xattr_slot = slot; | |
f23b5a59 JB |
3570 | if (found_key.offset == xattr_access || |
3571 | found_key.offset == xattr_default) | |
3572 | return 1; | |
3573 | } | |
46a53cca CM |
3574 | |
3575 | /* | |
3576 | * we found a key greater than an xattr key, there can't | |
3577 | * be any acls later on | |
3578 | */ | |
3579 | if (found_key.type > BTRFS_XATTR_ITEM_KEY) | |
3580 | return 0; | |
3581 | ||
3582 | slot++; | |
3583 | scanned++; | |
3584 | ||
3585 | /* | |
3586 | * it goes inode, inode backrefs, xattrs, extents, | |
3587 | * so if there are a ton of hard links to an inode there can | |
3588 | * be a lot of backrefs. Don't waste time searching too hard, | |
3589 | * this is just an optimization | |
3590 | */ | |
3591 | if (scanned >= 8) | |
3592 | break; | |
3593 | } | |
3594 | /* we hit the end of the leaf before we found an xattr or | |
3595 | * something larger than an xattr. We have to assume the inode | |
3596 | * has acls | |
3597 | */ | |
63541927 FDBM |
3598 | if (*first_xattr_slot == -1) |
3599 | *first_xattr_slot = slot; | |
46a53cca CM |
3600 | return 1; |
3601 | } | |
3602 | ||
d352ac68 CM |
3603 | /* |
3604 | * read an inode from the btree into the in-memory inode | |
3605 | */ | |
5d4f98a2 | 3606 | static void btrfs_read_locked_inode(struct inode *inode) |
39279cc3 CM |
3607 | { |
3608 | struct btrfs_path *path; | |
5f39d397 | 3609 | struct extent_buffer *leaf; |
39279cc3 CM |
3610 | struct btrfs_inode_item *inode_item; |
3611 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
3612 | struct btrfs_key location; | |
67de1176 | 3613 | unsigned long ptr; |
46a53cca | 3614 | int maybe_acls; |
618e21d5 | 3615 | u32 rdev; |
39279cc3 | 3616 | int ret; |
2f7e33d4 | 3617 | bool filled = false; |
63541927 | 3618 | int first_xattr_slot; |
2f7e33d4 MX |
3619 | |
3620 | ret = btrfs_fill_inode(inode, &rdev); | |
3621 | if (!ret) | |
3622 | filled = true; | |
39279cc3 CM |
3623 | |
3624 | path = btrfs_alloc_path(); | |
1748f843 MF |
3625 | if (!path) |
3626 | goto make_bad; | |
3627 | ||
39279cc3 | 3628 | memcpy(&location, &BTRFS_I(inode)->location, sizeof(location)); |
dc17ff8f | 3629 | |
39279cc3 | 3630 | ret = btrfs_lookup_inode(NULL, root, path, &location, 0); |
5f39d397 | 3631 | if (ret) |
39279cc3 | 3632 | goto make_bad; |
39279cc3 | 3633 | |
5f39d397 | 3634 | leaf = path->nodes[0]; |
2f7e33d4 MX |
3635 | |
3636 | if (filled) | |
67de1176 | 3637 | goto cache_index; |
2f7e33d4 | 3638 | |
5f39d397 CM |
3639 | inode_item = btrfs_item_ptr(leaf, path->slots[0], |
3640 | struct btrfs_inode_item); | |
5f39d397 | 3641 | inode->i_mode = btrfs_inode_mode(leaf, inode_item); |
bfe86848 | 3642 | set_nlink(inode, btrfs_inode_nlink(leaf, inode_item)); |
2f2f43d3 EB |
3643 | i_uid_write(inode, btrfs_inode_uid(leaf, inode_item)); |
3644 | i_gid_write(inode, btrfs_inode_gid(leaf, inode_item)); | |
dbe674a9 | 3645 | btrfs_i_size_write(inode, btrfs_inode_size(leaf, inode_item)); |
5f39d397 | 3646 | |
a937b979 DS |
3647 | inode->i_atime.tv_sec = btrfs_timespec_sec(leaf, &inode_item->atime); |
3648 | inode->i_atime.tv_nsec = btrfs_timespec_nsec(leaf, &inode_item->atime); | |
5f39d397 | 3649 | |
a937b979 DS |
3650 | inode->i_mtime.tv_sec = btrfs_timespec_sec(leaf, &inode_item->mtime); |
3651 | inode->i_mtime.tv_nsec = btrfs_timespec_nsec(leaf, &inode_item->mtime); | |
5f39d397 | 3652 | |
a937b979 DS |
3653 | inode->i_ctime.tv_sec = btrfs_timespec_sec(leaf, &inode_item->ctime); |
3654 | inode->i_ctime.tv_nsec = btrfs_timespec_nsec(leaf, &inode_item->ctime); | |
5f39d397 | 3655 | |
9cc97d64 | 3656 | BTRFS_I(inode)->i_otime.tv_sec = |
3657 | btrfs_timespec_sec(leaf, &inode_item->otime); | |
3658 | BTRFS_I(inode)->i_otime.tv_nsec = | |
3659 | btrfs_timespec_nsec(leaf, &inode_item->otime); | |
5f39d397 | 3660 | |
a76a3cd4 | 3661 | inode_set_bytes(inode, btrfs_inode_nbytes(leaf, inode_item)); |
e02119d5 | 3662 | BTRFS_I(inode)->generation = btrfs_inode_generation(leaf, inode_item); |
5dc562c5 JB |
3663 | BTRFS_I(inode)->last_trans = btrfs_inode_transid(leaf, inode_item); |
3664 | ||
6e17d30b YD |
3665 | inode->i_version = btrfs_inode_sequence(leaf, inode_item); |
3666 | inode->i_generation = BTRFS_I(inode)->generation; | |
3667 | inode->i_rdev = 0; | |
3668 | rdev = btrfs_inode_rdev(leaf, inode_item); | |
3669 | ||
3670 | BTRFS_I(inode)->index_cnt = (u64)-1; | |
3671 | BTRFS_I(inode)->flags = btrfs_inode_flags(leaf, inode_item); | |
3672 | ||
3673 | cache_index: | |
5dc562c5 JB |
3674 | /* |
3675 | * If we were modified in the current generation and evicted from memory | |
3676 | * and then re-read we need to do a full sync since we don't have any | |
3677 | * idea about which extents were modified before we were evicted from | |
3678 | * cache. | |
6e17d30b YD |
3679 | * |
3680 | * This is required for both inode re-read from disk and delayed inode | |
3681 | * in delayed_nodes_tree. | |
5dc562c5 JB |
3682 | */ |
3683 | if (BTRFS_I(inode)->last_trans == root->fs_info->generation) | |
3684 | set_bit(BTRFS_INODE_NEEDS_FULL_SYNC, | |
3685 | &BTRFS_I(inode)->runtime_flags); | |
3686 | ||
bde6c242 FM |
3687 | /* |
3688 | * We don't persist the id of the transaction where an unlink operation | |
3689 | * against the inode was last made. So here we assume the inode might | |
3690 | * have been evicted, and therefore the exact value of last_unlink_trans | |
3691 | * lost, and set it to last_trans to avoid metadata inconsistencies | |
3692 | * between the inode and its parent if the inode is fsync'ed and the log | |
3693 | * replayed. For example, in the scenario: | |
3694 | * | |
3695 | * touch mydir/foo | |
3696 | * ln mydir/foo mydir/bar | |
3697 | * sync | |
3698 | * unlink mydir/bar | |
3699 | * echo 2 > /proc/sys/vm/drop_caches # evicts inode | |
3700 | * xfs_io -c fsync mydir/foo | |
3701 | * <power failure> | |
3702 | * mount fs, triggers fsync log replay | |
3703 | * | |
3704 | * We must make sure that when we fsync our inode foo we also log its | |
3705 | * parent inode, otherwise after log replay the parent still has the | |
3706 | * dentry with the "bar" name but our inode foo has a link count of 1 | |
3707 | * and doesn't have an inode ref with the name "bar" anymore. | |
3708 | * | |
3709 | * Setting last_unlink_trans to last_trans is a pessimistic approach, | |
3710 | * but it guarantees correctness at the expense of ocassional full | |
3711 | * transaction commits on fsync if our inode is a directory, or if our | |
3712 | * inode is not a directory, logging its parent unnecessarily. | |
3713 | */ | |
3714 | BTRFS_I(inode)->last_unlink_trans = BTRFS_I(inode)->last_trans; | |
3715 | ||
67de1176 MX |
3716 | path->slots[0]++; |
3717 | if (inode->i_nlink != 1 || | |
3718 | path->slots[0] >= btrfs_header_nritems(leaf)) | |
3719 | goto cache_acl; | |
3720 | ||
3721 | btrfs_item_key_to_cpu(leaf, &location, path->slots[0]); | |
3722 | if (location.objectid != btrfs_ino(inode)) | |
3723 | goto cache_acl; | |
3724 | ||
3725 | ptr = btrfs_item_ptr_offset(leaf, path->slots[0]); | |
3726 | if (location.type == BTRFS_INODE_REF_KEY) { | |
3727 | struct btrfs_inode_ref *ref; | |
3728 | ||
3729 | ref = (struct btrfs_inode_ref *)ptr; | |
3730 | BTRFS_I(inode)->dir_index = btrfs_inode_ref_index(leaf, ref); | |
3731 | } else if (location.type == BTRFS_INODE_EXTREF_KEY) { | |
3732 | struct btrfs_inode_extref *extref; | |
3733 | ||
3734 | extref = (struct btrfs_inode_extref *)ptr; | |
3735 | BTRFS_I(inode)->dir_index = btrfs_inode_extref_index(leaf, | |
3736 | extref); | |
3737 | } | |
2f7e33d4 | 3738 | cache_acl: |
46a53cca CM |
3739 | /* |
3740 | * try to precache a NULL acl entry for files that don't have | |
3741 | * any xattrs or acls | |
3742 | */ | |
33345d01 | 3743 | maybe_acls = acls_after_inode_item(leaf, path->slots[0], |
63541927 FDBM |
3744 | btrfs_ino(inode), &first_xattr_slot); |
3745 | if (first_xattr_slot != -1) { | |
3746 | path->slots[0] = first_xattr_slot; | |
3747 | ret = btrfs_load_inode_props(inode, path); | |
3748 | if (ret) | |
3749 | btrfs_err(root->fs_info, | |
351fd353 | 3750 | "error loading props for ino %llu (root %llu): %d", |
63541927 FDBM |
3751 | btrfs_ino(inode), |
3752 | root->root_key.objectid, ret); | |
3753 | } | |
3754 | btrfs_free_path(path); | |
3755 | ||
72c04902 AV |
3756 | if (!maybe_acls) |
3757 | cache_no_acl(inode); | |
46a53cca | 3758 | |
39279cc3 | 3759 | switch (inode->i_mode & S_IFMT) { |
39279cc3 CM |
3760 | case S_IFREG: |
3761 | inode->i_mapping->a_ops = &btrfs_aops; | |
d1310b2e | 3762 | BTRFS_I(inode)->io_tree.ops = &btrfs_extent_io_ops; |
39279cc3 CM |
3763 | inode->i_fop = &btrfs_file_operations; |
3764 | inode->i_op = &btrfs_file_inode_operations; | |
3765 | break; | |
3766 | case S_IFDIR: | |
3767 | inode->i_fop = &btrfs_dir_file_operations; | |
3768 | if (root == root->fs_info->tree_root) | |
3769 | inode->i_op = &btrfs_dir_ro_inode_operations; | |
3770 | else | |
3771 | inode->i_op = &btrfs_dir_inode_operations; | |
3772 | break; | |
3773 | case S_IFLNK: | |
3774 | inode->i_op = &btrfs_symlink_inode_operations; | |
3775 | inode->i_mapping->a_ops = &btrfs_symlink_aops; | |
3776 | break; | |
618e21d5 | 3777 | default: |
0279b4cd | 3778 | inode->i_op = &btrfs_special_inode_operations; |
618e21d5 JB |
3779 | init_special_inode(inode, inode->i_mode, rdev); |
3780 | break; | |
39279cc3 | 3781 | } |
6cbff00f CH |
3782 | |
3783 | btrfs_update_iflags(inode); | |
39279cc3 CM |
3784 | return; |
3785 | ||
3786 | make_bad: | |
39279cc3 | 3787 | btrfs_free_path(path); |
39279cc3 CM |
3788 | make_bad_inode(inode); |
3789 | } | |
3790 | ||
d352ac68 CM |
3791 | /* |
3792 | * given a leaf and an inode, copy the inode fields into the leaf | |
3793 | */ | |
e02119d5 CM |
3794 | static void fill_inode_item(struct btrfs_trans_handle *trans, |
3795 | struct extent_buffer *leaf, | |
5f39d397 | 3796 | struct btrfs_inode_item *item, |
39279cc3 CM |
3797 | struct inode *inode) |
3798 | { | |
51fab693 LB |
3799 | struct btrfs_map_token token; |
3800 | ||
3801 | btrfs_init_map_token(&token); | |
5f39d397 | 3802 | |
51fab693 LB |
3803 | btrfs_set_token_inode_uid(leaf, item, i_uid_read(inode), &token); |
3804 | btrfs_set_token_inode_gid(leaf, item, i_gid_read(inode), &token); | |
3805 | btrfs_set_token_inode_size(leaf, item, BTRFS_I(inode)->disk_i_size, | |
3806 | &token); | |
3807 | btrfs_set_token_inode_mode(leaf, item, inode->i_mode, &token); | |
3808 | btrfs_set_token_inode_nlink(leaf, item, inode->i_nlink, &token); | |
5f39d397 | 3809 | |
a937b979 | 3810 | btrfs_set_token_timespec_sec(leaf, &item->atime, |
51fab693 | 3811 | inode->i_atime.tv_sec, &token); |
a937b979 | 3812 | btrfs_set_token_timespec_nsec(leaf, &item->atime, |
51fab693 | 3813 | inode->i_atime.tv_nsec, &token); |
5f39d397 | 3814 | |
a937b979 | 3815 | btrfs_set_token_timespec_sec(leaf, &item->mtime, |
51fab693 | 3816 | inode->i_mtime.tv_sec, &token); |
a937b979 | 3817 | btrfs_set_token_timespec_nsec(leaf, &item->mtime, |
51fab693 | 3818 | inode->i_mtime.tv_nsec, &token); |
5f39d397 | 3819 | |
a937b979 | 3820 | btrfs_set_token_timespec_sec(leaf, &item->ctime, |
51fab693 | 3821 | inode->i_ctime.tv_sec, &token); |
a937b979 | 3822 | btrfs_set_token_timespec_nsec(leaf, &item->ctime, |
51fab693 | 3823 | inode->i_ctime.tv_nsec, &token); |
5f39d397 | 3824 | |
9cc97d64 | 3825 | btrfs_set_token_timespec_sec(leaf, &item->otime, |
3826 | BTRFS_I(inode)->i_otime.tv_sec, &token); | |
3827 | btrfs_set_token_timespec_nsec(leaf, &item->otime, | |
3828 | BTRFS_I(inode)->i_otime.tv_nsec, &token); | |
3829 | ||
51fab693 LB |
3830 | btrfs_set_token_inode_nbytes(leaf, item, inode_get_bytes(inode), |
3831 | &token); | |
3832 | btrfs_set_token_inode_generation(leaf, item, BTRFS_I(inode)->generation, | |
3833 | &token); | |
3834 | btrfs_set_token_inode_sequence(leaf, item, inode->i_version, &token); | |
3835 | btrfs_set_token_inode_transid(leaf, item, trans->transid, &token); | |
3836 | btrfs_set_token_inode_rdev(leaf, item, inode->i_rdev, &token); | |
3837 | btrfs_set_token_inode_flags(leaf, item, BTRFS_I(inode)->flags, &token); | |
3838 | btrfs_set_token_inode_block_group(leaf, item, 0, &token); | |
39279cc3 CM |
3839 | } |
3840 | ||
d352ac68 CM |
3841 | /* |
3842 | * copy everything in the in-memory inode into the btree. | |
3843 | */ | |
2115133f | 3844 | static noinline int btrfs_update_inode_item(struct btrfs_trans_handle *trans, |
d397712b | 3845 | struct btrfs_root *root, struct inode *inode) |
39279cc3 CM |
3846 | { |
3847 | struct btrfs_inode_item *inode_item; | |
3848 | struct btrfs_path *path; | |
5f39d397 | 3849 | struct extent_buffer *leaf; |
39279cc3 CM |
3850 | int ret; |
3851 | ||
3852 | path = btrfs_alloc_path(); | |
16cdcec7 MX |
3853 | if (!path) |
3854 | return -ENOMEM; | |
3855 | ||
b9473439 | 3856 | path->leave_spinning = 1; |
16cdcec7 MX |
3857 | ret = btrfs_lookup_inode(trans, root, path, &BTRFS_I(inode)->location, |
3858 | 1); | |
39279cc3 CM |
3859 | if (ret) { |
3860 | if (ret > 0) | |
3861 | ret = -ENOENT; | |
3862 | goto failed; | |
3863 | } | |
3864 | ||
5f39d397 CM |
3865 | leaf = path->nodes[0]; |
3866 | inode_item = btrfs_item_ptr(leaf, path->slots[0], | |
16cdcec7 | 3867 | struct btrfs_inode_item); |
39279cc3 | 3868 | |
e02119d5 | 3869 | fill_inode_item(trans, leaf, inode_item, inode); |
5f39d397 | 3870 | btrfs_mark_buffer_dirty(leaf); |
15ee9bc7 | 3871 | btrfs_set_inode_last_trans(trans, inode); |
39279cc3 CM |
3872 | ret = 0; |
3873 | failed: | |
39279cc3 CM |
3874 | btrfs_free_path(path); |
3875 | return ret; | |
3876 | } | |
3877 | ||
2115133f CM |
3878 | /* |
3879 | * copy everything in the in-memory inode into the btree. | |
3880 | */ | |
3881 | noinline int btrfs_update_inode(struct btrfs_trans_handle *trans, | |
3882 | struct btrfs_root *root, struct inode *inode) | |
3883 | { | |
3884 | int ret; | |
3885 | ||
3886 | /* | |
3887 | * If the inode is a free space inode, we can deadlock during commit | |
3888 | * if we put it into the delayed code. | |
3889 | * | |
3890 | * The data relocation inode should also be directly updated | |
3891 | * without delay | |
3892 | */ | |
83eea1f1 | 3893 | if (!btrfs_is_free_space_inode(inode) |
1d52c78a JB |
3894 | && root->root_key.objectid != BTRFS_DATA_RELOC_TREE_OBJECTID |
3895 | && !root->fs_info->log_root_recovering) { | |
8ea05e3a AB |
3896 | btrfs_update_root_times(trans, root); |
3897 | ||
2115133f CM |
3898 | ret = btrfs_delayed_update_inode(trans, root, inode); |
3899 | if (!ret) | |
3900 | btrfs_set_inode_last_trans(trans, inode); | |
3901 | return ret; | |
3902 | } | |
3903 | ||
3904 | return btrfs_update_inode_item(trans, root, inode); | |
3905 | } | |
3906 | ||
be6aef60 JB |
3907 | noinline int btrfs_update_inode_fallback(struct btrfs_trans_handle *trans, |
3908 | struct btrfs_root *root, | |
3909 | struct inode *inode) | |
2115133f CM |
3910 | { |
3911 | int ret; | |
3912 | ||
3913 | ret = btrfs_update_inode(trans, root, inode); | |
3914 | if (ret == -ENOSPC) | |
3915 | return btrfs_update_inode_item(trans, root, inode); | |
3916 | return ret; | |
3917 | } | |
3918 | ||
d352ac68 CM |
3919 | /* |
3920 | * unlink helper that gets used here in inode.c and in the tree logging | |
3921 | * recovery code. It remove a link in a directory with a given name, and | |
3922 | * also drops the back refs in the inode to the directory | |
3923 | */ | |
92986796 AV |
3924 | static int __btrfs_unlink_inode(struct btrfs_trans_handle *trans, |
3925 | struct btrfs_root *root, | |
3926 | struct inode *dir, struct inode *inode, | |
3927 | const char *name, int name_len) | |
39279cc3 CM |
3928 | { |
3929 | struct btrfs_path *path; | |
39279cc3 | 3930 | int ret = 0; |
5f39d397 | 3931 | struct extent_buffer *leaf; |
39279cc3 | 3932 | struct btrfs_dir_item *di; |
5f39d397 | 3933 | struct btrfs_key key; |
aec7477b | 3934 | u64 index; |
33345d01 LZ |
3935 | u64 ino = btrfs_ino(inode); |
3936 | u64 dir_ino = btrfs_ino(dir); | |
39279cc3 CM |
3937 | |
3938 | path = btrfs_alloc_path(); | |
54aa1f4d CM |
3939 | if (!path) { |
3940 | ret = -ENOMEM; | |
554233a6 | 3941 | goto out; |
54aa1f4d CM |
3942 | } |
3943 | ||
b9473439 | 3944 | path->leave_spinning = 1; |
33345d01 | 3945 | di = btrfs_lookup_dir_item(trans, root, path, dir_ino, |
39279cc3 CM |
3946 | name, name_len, -1); |
3947 | if (IS_ERR(di)) { | |
3948 | ret = PTR_ERR(di); | |
3949 | goto err; | |
3950 | } | |
3951 | if (!di) { | |
3952 | ret = -ENOENT; | |
3953 | goto err; | |
3954 | } | |
5f39d397 CM |
3955 | leaf = path->nodes[0]; |
3956 | btrfs_dir_item_key_to_cpu(leaf, di, &key); | |
39279cc3 | 3957 | ret = btrfs_delete_one_dir_name(trans, root, path, di); |
54aa1f4d CM |
3958 | if (ret) |
3959 | goto err; | |
b3b4aa74 | 3960 | btrfs_release_path(path); |
39279cc3 | 3961 | |
67de1176 MX |
3962 | /* |
3963 | * If we don't have dir index, we have to get it by looking up | |
3964 | * the inode ref, since we get the inode ref, remove it directly, | |
3965 | * it is unnecessary to do delayed deletion. | |
3966 | * | |
3967 | * But if we have dir index, needn't search inode ref to get it. | |
3968 | * Since the inode ref is close to the inode item, it is better | |
3969 | * that we delay to delete it, and just do this deletion when | |
3970 | * we update the inode item. | |
3971 | */ | |
3972 | if (BTRFS_I(inode)->dir_index) { | |
3973 | ret = btrfs_delayed_delete_inode_ref(inode); | |
3974 | if (!ret) { | |
3975 | index = BTRFS_I(inode)->dir_index; | |
3976 | goto skip_backref; | |
3977 | } | |
3978 | } | |
3979 | ||
33345d01 LZ |
3980 | ret = btrfs_del_inode_ref(trans, root, name, name_len, ino, |
3981 | dir_ino, &index); | |
aec7477b | 3982 | if (ret) { |
c2cf52eb SK |
3983 | btrfs_info(root->fs_info, |
3984 | "failed to delete reference to %.*s, inode %llu parent %llu", | |
c1c9ff7c | 3985 | name_len, name, ino, dir_ino); |
79787eaa | 3986 | btrfs_abort_transaction(trans, root, ret); |
aec7477b JB |
3987 | goto err; |
3988 | } | |
67de1176 | 3989 | skip_backref: |
16cdcec7 | 3990 | ret = btrfs_delete_delayed_dir_index(trans, root, dir, index); |
79787eaa JM |
3991 | if (ret) { |
3992 | btrfs_abort_transaction(trans, root, ret); | |
39279cc3 | 3993 | goto err; |
79787eaa | 3994 | } |
39279cc3 | 3995 | |
e02119d5 | 3996 | ret = btrfs_del_inode_ref_in_log(trans, root, name, name_len, |
33345d01 | 3997 | inode, dir_ino); |
79787eaa JM |
3998 | if (ret != 0 && ret != -ENOENT) { |
3999 | btrfs_abort_transaction(trans, root, ret); | |
4000 | goto err; | |
4001 | } | |
e02119d5 CM |
4002 | |
4003 | ret = btrfs_del_dir_entries_in_log(trans, root, name, name_len, | |
4004 | dir, index); | |
6418c961 CM |
4005 | if (ret == -ENOENT) |
4006 | ret = 0; | |
d4e3991b ZB |
4007 | else if (ret) |
4008 | btrfs_abort_transaction(trans, root, ret); | |
39279cc3 CM |
4009 | err: |
4010 | btrfs_free_path(path); | |
e02119d5 CM |
4011 | if (ret) |
4012 | goto out; | |
4013 | ||
4014 | btrfs_i_size_write(dir, dir->i_size - name_len * 2); | |
0c4d2d95 JB |
4015 | inode_inc_iversion(inode); |
4016 | inode_inc_iversion(dir); | |
e02119d5 | 4017 | inode->i_ctime = dir->i_mtime = dir->i_ctime = CURRENT_TIME; |
b9959295 | 4018 | ret = btrfs_update_inode(trans, root, dir); |
e02119d5 | 4019 | out: |
39279cc3 CM |
4020 | return ret; |
4021 | } | |
4022 | ||
92986796 AV |
4023 | int btrfs_unlink_inode(struct btrfs_trans_handle *trans, |
4024 | struct btrfs_root *root, | |
4025 | struct inode *dir, struct inode *inode, | |
4026 | const char *name, int name_len) | |
4027 | { | |
4028 | int ret; | |
4029 | ret = __btrfs_unlink_inode(trans, root, dir, inode, name, name_len); | |
4030 | if (!ret) { | |
8b558c5f | 4031 | drop_nlink(inode); |
92986796 AV |
4032 | ret = btrfs_update_inode(trans, root, inode); |
4033 | } | |
4034 | return ret; | |
4035 | } | |
39279cc3 | 4036 | |
a22285a6 YZ |
4037 | /* |
4038 | * helper to start transaction for unlink and rmdir. | |
4039 | * | |
d52be818 JB |
4040 | * unlink and rmdir are special in btrfs, they do not always free space, so |
4041 | * if we cannot make our reservations the normal way try and see if there is | |
4042 | * plenty of slack room in the global reserve to migrate, otherwise we cannot | |
4043 | * allow the unlink to occur. | |
a22285a6 | 4044 | */ |
d52be818 | 4045 | static struct btrfs_trans_handle *__unlink_start_trans(struct inode *dir) |
4df27c4d | 4046 | { |
a22285a6 | 4047 | struct btrfs_root *root = BTRFS_I(dir)->root; |
4df27c4d | 4048 | |
e70bea5f JB |
4049 | /* |
4050 | * 1 for the possible orphan item | |
4051 | * 1 for the dir item | |
4052 | * 1 for the dir index | |
4053 | * 1 for the inode ref | |
e70bea5f JB |
4054 | * 1 for the inode |
4055 | */ | |
8eab77ff | 4056 | return btrfs_start_transaction_fallback_global_rsv(root, 5, 5); |
a22285a6 YZ |
4057 | } |
4058 | ||
4059 | static int btrfs_unlink(struct inode *dir, struct dentry *dentry) | |
4060 | { | |
4061 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
4062 | struct btrfs_trans_handle *trans; | |
2b0143b5 | 4063 | struct inode *inode = d_inode(dentry); |
a22285a6 | 4064 | int ret; |
a22285a6 | 4065 | |
d52be818 | 4066 | trans = __unlink_start_trans(dir); |
a22285a6 YZ |
4067 | if (IS_ERR(trans)) |
4068 | return PTR_ERR(trans); | |
5f39d397 | 4069 | |
2b0143b5 | 4070 | btrfs_record_unlink_dir(trans, dir, d_inode(dentry), 0); |
12fcfd22 | 4071 | |
2b0143b5 | 4072 | ret = btrfs_unlink_inode(trans, root, dir, d_inode(dentry), |
e02119d5 | 4073 | dentry->d_name.name, dentry->d_name.len); |
b532402e TI |
4074 | if (ret) |
4075 | goto out; | |
7b128766 | 4076 | |
a22285a6 | 4077 | if (inode->i_nlink == 0) { |
7b128766 | 4078 | ret = btrfs_orphan_add(trans, inode); |
b532402e TI |
4079 | if (ret) |
4080 | goto out; | |
a22285a6 | 4081 | } |
7b128766 | 4082 | |
b532402e | 4083 | out: |
d52be818 | 4084 | btrfs_end_transaction(trans, root); |
b53d3f5d | 4085 | btrfs_btree_balance_dirty(root); |
39279cc3 CM |
4086 | return ret; |
4087 | } | |
4088 | ||
4df27c4d YZ |
4089 | int btrfs_unlink_subvol(struct btrfs_trans_handle *trans, |
4090 | struct btrfs_root *root, | |
4091 | struct inode *dir, u64 objectid, | |
4092 | const char *name, int name_len) | |
4093 | { | |
4094 | struct btrfs_path *path; | |
4095 | struct extent_buffer *leaf; | |
4096 | struct btrfs_dir_item *di; | |
4097 | struct btrfs_key key; | |
4098 | u64 index; | |
4099 | int ret; | |
33345d01 | 4100 | u64 dir_ino = btrfs_ino(dir); |
4df27c4d YZ |
4101 | |
4102 | path = btrfs_alloc_path(); | |
4103 | if (!path) | |
4104 | return -ENOMEM; | |
4105 | ||
33345d01 | 4106 | di = btrfs_lookup_dir_item(trans, root, path, dir_ino, |
4df27c4d | 4107 | name, name_len, -1); |
79787eaa JM |
4108 | if (IS_ERR_OR_NULL(di)) { |
4109 | if (!di) | |
4110 | ret = -ENOENT; | |
4111 | else | |
4112 | ret = PTR_ERR(di); | |
4113 | goto out; | |
4114 | } | |
4df27c4d YZ |
4115 | |
4116 | leaf = path->nodes[0]; | |
4117 | btrfs_dir_item_key_to_cpu(leaf, di, &key); | |
4118 | WARN_ON(key.type != BTRFS_ROOT_ITEM_KEY || key.objectid != objectid); | |
4119 | ret = btrfs_delete_one_dir_name(trans, root, path, di); | |
79787eaa JM |
4120 | if (ret) { |
4121 | btrfs_abort_transaction(trans, root, ret); | |
4122 | goto out; | |
4123 | } | |
b3b4aa74 | 4124 | btrfs_release_path(path); |
4df27c4d YZ |
4125 | |
4126 | ret = btrfs_del_root_ref(trans, root->fs_info->tree_root, | |
4127 | objectid, root->root_key.objectid, | |
33345d01 | 4128 | dir_ino, &index, name, name_len); |
4df27c4d | 4129 | if (ret < 0) { |
79787eaa JM |
4130 | if (ret != -ENOENT) { |
4131 | btrfs_abort_transaction(trans, root, ret); | |
4132 | goto out; | |
4133 | } | |
33345d01 | 4134 | di = btrfs_search_dir_index_item(root, path, dir_ino, |
4df27c4d | 4135 | name, name_len); |
79787eaa JM |
4136 | if (IS_ERR_OR_NULL(di)) { |
4137 | if (!di) | |
4138 | ret = -ENOENT; | |
4139 | else | |
4140 | ret = PTR_ERR(di); | |
4141 | btrfs_abort_transaction(trans, root, ret); | |
4142 | goto out; | |
4143 | } | |
4df27c4d YZ |
4144 | |
4145 | leaf = path->nodes[0]; | |
4146 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); | |
b3b4aa74 | 4147 | btrfs_release_path(path); |
4df27c4d YZ |
4148 | index = key.offset; |
4149 | } | |
945d8962 | 4150 | btrfs_release_path(path); |
4df27c4d | 4151 | |
16cdcec7 | 4152 | ret = btrfs_delete_delayed_dir_index(trans, root, dir, index); |
79787eaa JM |
4153 | if (ret) { |
4154 | btrfs_abort_transaction(trans, root, ret); | |
4155 | goto out; | |
4156 | } | |
4df27c4d YZ |
4157 | |
4158 | btrfs_i_size_write(dir, dir->i_size - name_len * 2); | |
0c4d2d95 | 4159 | inode_inc_iversion(dir); |
4df27c4d | 4160 | dir->i_mtime = dir->i_ctime = CURRENT_TIME; |
5a24e84c | 4161 | ret = btrfs_update_inode_fallback(trans, root, dir); |
79787eaa JM |
4162 | if (ret) |
4163 | btrfs_abort_transaction(trans, root, ret); | |
4164 | out: | |
71d7aed0 | 4165 | btrfs_free_path(path); |
79787eaa | 4166 | return ret; |
4df27c4d YZ |
4167 | } |
4168 | ||
39279cc3 CM |
4169 | static int btrfs_rmdir(struct inode *dir, struct dentry *dentry) |
4170 | { | |
2b0143b5 | 4171 | struct inode *inode = d_inode(dentry); |
1832a6d5 | 4172 | int err = 0; |
39279cc3 | 4173 | struct btrfs_root *root = BTRFS_I(dir)->root; |
39279cc3 | 4174 | struct btrfs_trans_handle *trans; |
39279cc3 | 4175 | |
b3ae244e | 4176 | if (inode->i_size > BTRFS_EMPTY_DIR_SIZE) |
134d4512 | 4177 | return -ENOTEMPTY; |
b3ae244e DS |
4178 | if (btrfs_ino(inode) == BTRFS_FIRST_FREE_OBJECTID) |
4179 | return -EPERM; | |
134d4512 | 4180 | |
d52be818 | 4181 | trans = __unlink_start_trans(dir); |
a22285a6 | 4182 | if (IS_ERR(trans)) |
5df6a9f6 | 4183 | return PTR_ERR(trans); |
5df6a9f6 | 4184 | |
33345d01 | 4185 | if (unlikely(btrfs_ino(inode) == BTRFS_EMPTY_SUBVOL_DIR_OBJECTID)) { |
4df27c4d YZ |
4186 | err = btrfs_unlink_subvol(trans, root, dir, |
4187 | BTRFS_I(inode)->location.objectid, | |
4188 | dentry->d_name.name, | |
4189 | dentry->d_name.len); | |
4190 | goto out; | |
4191 | } | |
4192 | ||
7b128766 JB |
4193 | err = btrfs_orphan_add(trans, inode); |
4194 | if (err) | |
4df27c4d | 4195 | goto out; |
7b128766 | 4196 | |
39279cc3 | 4197 | /* now the directory is empty */ |
2b0143b5 | 4198 | err = btrfs_unlink_inode(trans, root, dir, d_inode(dentry), |
e02119d5 | 4199 | dentry->d_name.name, dentry->d_name.len); |
d397712b | 4200 | if (!err) |
dbe674a9 | 4201 | btrfs_i_size_write(inode, 0); |
4df27c4d | 4202 | out: |
d52be818 | 4203 | btrfs_end_transaction(trans, root); |
b53d3f5d | 4204 | btrfs_btree_balance_dirty(root); |
3954401f | 4205 | |
39279cc3 CM |
4206 | return err; |
4207 | } | |
4208 | ||
28f75a0e CM |
4209 | static int truncate_space_check(struct btrfs_trans_handle *trans, |
4210 | struct btrfs_root *root, | |
4211 | u64 bytes_deleted) | |
4212 | { | |
4213 | int ret; | |
4214 | ||
4215 | bytes_deleted = btrfs_csum_bytes_to_leaves(root, bytes_deleted); | |
4216 | ret = btrfs_block_rsv_add(root, &root->fs_info->trans_block_rsv, | |
4217 | bytes_deleted, BTRFS_RESERVE_NO_FLUSH); | |
4218 | if (!ret) | |
4219 | trans->bytes_reserved += bytes_deleted; | |
4220 | return ret; | |
4221 | ||
4222 | } | |
4223 | ||
0305cd5f FM |
4224 | static int truncate_inline_extent(struct inode *inode, |
4225 | struct btrfs_path *path, | |
4226 | struct btrfs_key *found_key, | |
4227 | const u64 item_end, | |
4228 | const u64 new_size) | |
4229 | { | |
4230 | struct extent_buffer *leaf = path->nodes[0]; | |
4231 | int slot = path->slots[0]; | |
4232 | struct btrfs_file_extent_item *fi; | |
4233 | u32 size = (u32)(new_size - found_key->offset); | |
4234 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
4235 | ||
4236 | fi = btrfs_item_ptr(leaf, slot, struct btrfs_file_extent_item); | |
4237 | ||
4238 | if (btrfs_file_extent_compression(leaf, fi) != BTRFS_COMPRESS_NONE) { | |
4239 | loff_t offset = new_size; | |
4240 | loff_t page_end = ALIGN(offset, PAGE_CACHE_SIZE); | |
4241 | ||
4242 | /* | |
4243 | * Zero out the remaining of the last page of our inline extent, | |
4244 | * instead of directly truncating our inline extent here - that | |
4245 | * would be much more complex (decompressing all the data, then | |
4246 | * compressing the truncated data, which might be bigger than | |
4247 | * the size of the inline extent, resize the extent, etc). | |
4248 | * We release the path because to get the page we might need to | |
4249 | * read the extent item from disk (data not in the page cache). | |
4250 | */ | |
4251 | btrfs_release_path(path); | |
4252 | return btrfs_truncate_page(inode, offset, page_end - offset, 0); | |
4253 | } | |
4254 | ||
4255 | btrfs_set_file_extent_ram_bytes(leaf, fi, size); | |
4256 | size = btrfs_file_extent_calc_inline_size(size); | |
4257 | btrfs_truncate_item(root, path, size, 1); | |
4258 | ||
4259 | if (test_bit(BTRFS_ROOT_REF_COWS, &root->state)) | |
4260 | inode_sub_bytes(inode, item_end + 1 - new_size); | |
4261 | ||
4262 | return 0; | |
4263 | } | |
4264 | ||
39279cc3 CM |
4265 | /* |
4266 | * this can truncate away extent items, csum items and directory items. | |
4267 | * It starts at a high offset and removes keys until it can't find | |
d352ac68 | 4268 | * any higher than new_size |
39279cc3 CM |
4269 | * |
4270 | * csum items that cross the new i_size are truncated to the new size | |
4271 | * as well. | |
7b128766 JB |
4272 | * |
4273 | * min_type is the minimum key type to truncate down to. If set to 0, this | |
4274 | * will kill all the items on this inode, including the INODE_ITEM_KEY. | |
39279cc3 | 4275 | */ |
8082510e YZ |
4276 | int btrfs_truncate_inode_items(struct btrfs_trans_handle *trans, |
4277 | struct btrfs_root *root, | |
4278 | struct inode *inode, | |
4279 | u64 new_size, u32 min_type) | |
39279cc3 | 4280 | { |
39279cc3 | 4281 | struct btrfs_path *path; |
5f39d397 | 4282 | struct extent_buffer *leaf; |
39279cc3 | 4283 | struct btrfs_file_extent_item *fi; |
8082510e YZ |
4284 | struct btrfs_key key; |
4285 | struct btrfs_key found_key; | |
39279cc3 | 4286 | u64 extent_start = 0; |
db94535d | 4287 | u64 extent_num_bytes = 0; |
5d4f98a2 | 4288 | u64 extent_offset = 0; |
39279cc3 | 4289 | u64 item_end = 0; |
c1aa4575 | 4290 | u64 last_size = new_size; |
8082510e | 4291 | u32 found_type = (u8)-1; |
39279cc3 CM |
4292 | int found_extent; |
4293 | int del_item; | |
85e21bac CM |
4294 | int pending_del_nr = 0; |
4295 | int pending_del_slot = 0; | |
179e29e4 | 4296 | int extent_type = -1; |
8082510e YZ |
4297 | int ret; |
4298 | int err = 0; | |
33345d01 | 4299 | u64 ino = btrfs_ino(inode); |
28ed1345 | 4300 | u64 bytes_deleted = 0; |
1262133b JB |
4301 | bool be_nice = 0; |
4302 | bool should_throttle = 0; | |
28f75a0e | 4303 | bool should_end = 0; |
8082510e YZ |
4304 | |
4305 | BUG_ON(new_size > 0 && min_type != BTRFS_EXTENT_DATA_KEY); | |
39279cc3 | 4306 | |
28ed1345 CM |
4307 | /* |
4308 | * for non-free space inodes and ref cows, we want to back off from | |
4309 | * time to time | |
4310 | */ | |
4311 | if (!btrfs_is_free_space_inode(inode) && | |
4312 | test_bit(BTRFS_ROOT_REF_COWS, &root->state)) | |
4313 | be_nice = 1; | |
4314 | ||
0eb0e19c MF |
4315 | path = btrfs_alloc_path(); |
4316 | if (!path) | |
4317 | return -ENOMEM; | |
e4058b54 | 4318 | path->reada = READA_BACK; |
0eb0e19c | 4319 | |
5dc562c5 JB |
4320 | /* |
4321 | * We want to drop from the next block forward in case this new size is | |
4322 | * not block aligned since we will be keeping the last block of the | |
4323 | * extent just the way it is. | |
4324 | */ | |
27cdeb70 MX |
4325 | if (test_bit(BTRFS_ROOT_REF_COWS, &root->state) || |
4326 | root == root->fs_info->tree_root) | |
fda2832f QW |
4327 | btrfs_drop_extent_cache(inode, ALIGN(new_size, |
4328 | root->sectorsize), (u64)-1, 0); | |
8082510e | 4329 | |
16cdcec7 MX |
4330 | /* |
4331 | * This function is also used to drop the items in the log tree before | |
4332 | * we relog the inode, so if root != BTRFS_I(inode)->root, it means | |
4333 | * it is used to drop the loged items. So we shouldn't kill the delayed | |
4334 | * items. | |
4335 | */ | |
4336 | if (min_type == 0 && root == BTRFS_I(inode)->root) | |
4337 | btrfs_kill_delayed_inode_items(inode); | |
4338 | ||
33345d01 | 4339 | key.objectid = ino; |
39279cc3 | 4340 | key.offset = (u64)-1; |
5f39d397 CM |
4341 | key.type = (u8)-1; |
4342 | ||
85e21bac | 4343 | search_again: |
28ed1345 CM |
4344 | /* |
4345 | * with a 16K leaf size and 128MB extents, you can actually queue | |
4346 | * up a huge file in a single leaf. Most of the time that | |
4347 | * bytes_deleted is > 0, it will be huge by the time we get here | |
4348 | */ | |
ee22184b | 4349 | if (be_nice && bytes_deleted > SZ_32M) { |
28ed1345 CM |
4350 | if (btrfs_should_end_transaction(trans, root)) { |
4351 | err = -EAGAIN; | |
4352 | goto error; | |
4353 | } | |
4354 | } | |
4355 | ||
4356 | ||
b9473439 | 4357 | path->leave_spinning = 1; |
85e21bac | 4358 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); |
8082510e YZ |
4359 | if (ret < 0) { |
4360 | err = ret; | |
4361 | goto out; | |
4362 | } | |
d397712b | 4363 | |
85e21bac | 4364 | if (ret > 0) { |
e02119d5 CM |
4365 | /* there are no items in the tree for us to truncate, we're |
4366 | * done | |
4367 | */ | |
8082510e YZ |
4368 | if (path->slots[0] == 0) |
4369 | goto out; | |
85e21bac CM |
4370 | path->slots[0]--; |
4371 | } | |
4372 | ||
d397712b | 4373 | while (1) { |
39279cc3 | 4374 | fi = NULL; |
5f39d397 CM |
4375 | leaf = path->nodes[0]; |
4376 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); | |
962a298f | 4377 | found_type = found_key.type; |
39279cc3 | 4378 | |
33345d01 | 4379 | if (found_key.objectid != ino) |
39279cc3 | 4380 | break; |
5f39d397 | 4381 | |
85e21bac | 4382 | if (found_type < min_type) |
39279cc3 CM |
4383 | break; |
4384 | ||
5f39d397 | 4385 | item_end = found_key.offset; |
39279cc3 | 4386 | if (found_type == BTRFS_EXTENT_DATA_KEY) { |
5f39d397 | 4387 | fi = btrfs_item_ptr(leaf, path->slots[0], |
39279cc3 | 4388 | struct btrfs_file_extent_item); |
179e29e4 CM |
4389 | extent_type = btrfs_file_extent_type(leaf, fi); |
4390 | if (extent_type != BTRFS_FILE_EXTENT_INLINE) { | |
5f39d397 | 4391 | item_end += |
db94535d | 4392 | btrfs_file_extent_num_bytes(leaf, fi); |
179e29e4 | 4393 | } else if (extent_type == BTRFS_FILE_EXTENT_INLINE) { |
179e29e4 | 4394 | item_end += btrfs_file_extent_inline_len(leaf, |
514ac8ad | 4395 | path->slots[0], fi); |
39279cc3 | 4396 | } |
008630c1 | 4397 | item_end--; |
39279cc3 | 4398 | } |
8082510e YZ |
4399 | if (found_type > min_type) { |
4400 | del_item = 1; | |
4401 | } else { | |
4402 | if (item_end < new_size) | |
b888db2b | 4403 | break; |
8082510e YZ |
4404 | if (found_key.offset >= new_size) |
4405 | del_item = 1; | |
4406 | else | |
4407 | del_item = 0; | |
39279cc3 | 4408 | } |
39279cc3 | 4409 | found_extent = 0; |
39279cc3 | 4410 | /* FIXME, shrink the extent if the ref count is only 1 */ |
179e29e4 CM |
4411 | if (found_type != BTRFS_EXTENT_DATA_KEY) |
4412 | goto delete; | |
4413 | ||
7f4f6e0a JB |
4414 | if (del_item) |
4415 | last_size = found_key.offset; | |
4416 | else | |
4417 | last_size = new_size; | |
4418 | ||
179e29e4 | 4419 | if (extent_type != BTRFS_FILE_EXTENT_INLINE) { |
39279cc3 | 4420 | u64 num_dec; |
db94535d | 4421 | extent_start = btrfs_file_extent_disk_bytenr(leaf, fi); |
f70a9a6b | 4422 | if (!del_item) { |
db94535d CM |
4423 | u64 orig_num_bytes = |
4424 | btrfs_file_extent_num_bytes(leaf, fi); | |
fda2832f QW |
4425 | extent_num_bytes = ALIGN(new_size - |
4426 | found_key.offset, | |
4427 | root->sectorsize); | |
db94535d CM |
4428 | btrfs_set_file_extent_num_bytes(leaf, fi, |
4429 | extent_num_bytes); | |
4430 | num_dec = (orig_num_bytes - | |
9069218d | 4431 | extent_num_bytes); |
27cdeb70 MX |
4432 | if (test_bit(BTRFS_ROOT_REF_COWS, |
4433 | &root->state) && | |
4434 | extent_start != 0) | |
a76a3cd4 | 4435 | inode_sub_bytes(inode, num_dec); |
5f39d397 | 4436 | btrfs_mark_buffer_dirty(leaf); |
39279cc3 | 4437 | } else { |
db94535d CM |
4438 | extent_num_bytes = |
4439 | btrfs_file_extent_disk_num_bytes(leaf, | |
4440 | fi); | |
5d4f98a2 YZ |
4441 | extent_offset = found_key.offset - |
4442 | btrfs_file_extent_offset(leaf, fi); | |
4443 | ||
39279cc3 | 4444 | /* FIXME blocksize != 4096 */ |
9069218d | 4445 | num_dec = btrfs_file_extent_num_bytes(leaf, fi); |
39279cc3 CM |
4446 | if (extent_start != 0) { |
4447 | found_extent = 1; | |
27cdeb70 MX |
4448 | if (test_bit(BTRFS_ROOT_REF_COWS, |
4449 | &root->state)) | |
a76a3cd4 | 4450 | inode_sub_bytes(inode, num_dec); |
e02119d5 | 4451 | } |
39279cc3 | 4452 | } |
9069218d | 4453 | } else if (extent_type == BTRFS_FILE_EXTENT_INLINE) { |
c8b97818 CM |
4454 | /* |
4455 | * we can't truncate inline items that have had | |
4456 | * special encodings | |
4457 | */ | |
4458 | if (!del_item && | |
c8b97818 CM |
4459 | btrfs_file_extent_encryption(leaf, fi) == 0 && |
4460 | btrfs_file_extent_other_encoding(leaf, fi) == 0) { | |
514ac8ad CM |
4461 | |
4462 | /* | |
0305cd5f FM |
4463 | * Need to release path in order to truncate a |
4464 | * compressed extent. So delete any accumulated | |
4465 | * extent items so far. | |
514ac8ad | 4466 | */ |
0305cd5f FM |
4467 | if (btrfs_file_extent_compression(leaf, fi) != |
4468 | BTRFS_COMPRESS_NONE && pending_del_nr) { | |
4469 | err = btrfs_del_items(trans, root, path, | |
4470 | pending_del_slot, | |
4471 | pending_del_nr); | |
4472 | if (err) { | |
4473 | btrfs_abort_transaction(trans, | |
4474 | root, | |
4475 | err); | |
4476 | goto error; | |
4477 | } | |
4478 | pending_del_nr = 0; | |
4479 | } | |
4480 | ||
4481 | err = truncate_inline_extent(inode, path, | |
4482 | &found_key, | |
4483 | item_end, | |
4484 | new_size); | |
4485 | if (err) { | |
4486 | btrfs_abort_transaction(trans, | |
4487 | root, err); | |
4488 | goto error; | |
4489 | } | |
27cdeb70 MX |
4490 | } else if (test_bit(BTRFS_ROOT_REF_COWS, |
4491 | &root->state)) { | |
0305cd5f | 4492 | inode_sub_bytes(inode, item_end + 1 - new_size); |
9069218d | 4493 | } |
39279cc3 | 4494 | } |
179e29e4 | 4495 | delete: |
39279cc3 | 4496 | if (del_item) { |
85e21bac CM |
4497 | if (!pending_del_nr) { |
4498 | /* no pending yet, add ourselves */ | |
4499 | pending_del_slot = path->slots[0]; | |
4500 | pending_del_nr = 1; | |
4501 | } else if (pending_del_nr && | |
4502 | path->slots[0] + 1 == pending_del_slot) { | |
4503 | /* hop on the pending chunk */ | |
4504 | pending_del_nr++; | |
4505 | pending_del_slot = path->slots[0]; | |
4506 | } else { | |
d397712b | 4507 | BUG(); |
85e21bac | 4508 | } |
39279cc3 CM |
4509 | } else { |
4510 | break; | |
4511 | } | |
28f75a0e CM |
4512 | should_throttle = 0; |
4513 | ||
27cdeb70 MX |
4514 | if (found_extent && |
4515 | (test_bit(BTRFS_ROOT_REF_COWS, &root->state) || | |
4516 | root == root->fs_info->tree_root)) { | |
b9473439 | 4517 | btrfs_set_path_blocking(path); |
28ed1345 | 4518 | bytes_deleted += extent_num_bytes; |
39279cc3 | 4519 | ret = btrfs_free_extent(trans, root, extent_start, |
5d4f98a2 YZ |
4520 | extent_num_bytes, 0, |
4521 | btrfs_header_owner(leaf), | |
b06c4bf5 | 4522 | ino, extent_offset); |
39279cc3 | 4523 | BUG_ON(ret); |
1262133b | 4524 | if (btrfs_should_throttle_delayed_refs(trans, root)) |
28ed1345 CM |
4525 | btrfs_async_run_delayed_refs(root, |
4526 | trans->delayed_ref_updates * 2, 0); | |
28f75a0e CM |
4527 | if (be_nice) { |
4528 | if (truncate_space_check(trans, root, | |
4529 | extent_num_bytes)) { | |
4530 | should_end = 1; | |
4531 | } | |
4532 | if (btrfs_should_throttle_delayed_refs(trans, | |
4533 | root)) { | |
4534 | should_throttle = 1; | |
4535 | } | |
4536 | } | |
39279cc3 | 4537 | } |
85e21bac | 4538 | |
8082510e YZ |
4539 | if (found_type == BTRFS_INODE_ITEM_KEY) |
4540 | break; | |
4541 | ||
4542 | if (path->slots[0] == 0 || | |
1262133b | 4543 | path->slots[0] != pending_del_slot || |
28f75a0e | 4544 | should_throttle || should_end) { |
8082510e YZ |
4545 | if (pending_del_nr) { |
4546 | ret = btrfs_del_items(trans, root, path, | |
4547 | pending_del_slot, | |
4548 | pending_del_nr); | |
79787eaa JM |
4549 | if (ret) { |
4550 | btrfs_abort_transaction(trans, | |
4551 | root, ret); | |
4552 | goto error; | |
4553 | } | |
8082510e YZ |
4554 | pending_del_nr = 0; |
4555 | } | |
b3b4aa74 | 4556 | btrfs_release_path(path); |
28f75a0e | 4557 | if (should_throttle) { |
1262133b JB |
4558 | unsigned long updates = trans->delayed_ref_updates; |
4559 | if (updates) { | |
4560 | trans->delayed_ref_updates = 0; | |
4561 | ret = btrfs_run_delayed_refs(trans, root, updates * 2); | |
4562 | if (ret && !err) | |
4563 | err = ret; | |
4564 | } | |
4565 | } | |
28f75a0e CM |
4566 | /* |
4567 | * if we failed to refill our space rsv, bail out | |
4568 | * and let the transaction restart | |
4569 | */ | |
4570 | if (should_end) { | |
4571 | err = -EAGAIN; | |
4572 | goto error; | |
4573 | } | |
85e21bac | 4574 | goto search_again; |
8082510e YZ |
4575 | } else { |
4576 | path->slots[0]--; | |
85e21bac | 4577 | } |
39279cc3 | 4578 | } |
8082510e | 4579 | out: |
85e21bac CM |
4580 | if (pending_del_nr) { |
4581 | ret = btrfs_del_items(trans, root, path, pending_del_slot, | |
4582 | pending_del_nr); | |
79787eaa JM |
4583 | if (ret) |
4584 | btrfs_abort_transaction(trans, root, ret); | |
85e21bac | 4585 | } |
79787eaa | 4586 | error: |
c1aa4575 | 4587 | if (root->root_key.objectid != BTRFS_TREE_LOG_OBJECTID) |
7f4f6e0a | 4588 | btrfs_ordered_update_i_size(inode, last_size, NULL); |
28ed1345 | 4589 | |
39279cc3 | 4590 | btrfs_free_path(path); |
28ed1345 | 4591 | |
ee22184b | 4592 | if (be_nice && bytes_deleted > SZ_32M) { |
28ed1345 CM |
4593 | unsigned long updates = trans->delayed_ref_updates; |
4594 | if (updates) { | |
4595 | trans->delayed_ref_updates = 0; | |
4596 | ret = btrfs_run_delayed_refs(trans, root, updates * 2); | |
4597 | if (ret && !err) | |
4598 | err = ret; | |
4599 | } | |
4600 | } | |
8082510e | 4601 | return err; |
39279cc3 CM |
4602 | } |
4603 | ||
4604 | /* | |
2aaa6655 JB |
4605 | * btrfs_truncate_page - read, zero a chunk and write a page |
4606 | * @inode - inode that we're zeroing | |
4607 | * @from - the offset to start zeroing | |
4608 | * @len - the length to zero, 0 to zero the entire range respective to the | |
4609 | * offset | |
4610 | * @front - zero up to the offset instead of from the offset on | |
4611 | * | |
4612 | * This will find the page for the "from" offset and cow the page and zero the | |
4613 | * part we want to zero. This is used with truncate and hole punching. | |
39279cc3 | 4614 | */ |
2aaa6655 JB |
4615 | int btrfs_truncate_page(struct inode *inode, loff_t from, loff_t len, |
4616 | int front) | |
39279cc3 | 4617 | { |
2aaa6655 | 4618 | struct address_space *mapping = inode->i_mapping; |
db94535d | 4619 | struct btrfs_root *root = BTRFS_I(inode)->root; |
e6dcd2dc CM |
4620 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; |
4621 | struct btrfs_ordered_extent *ordered; | |
2ac55d41 | 4622 | struct extent_state *cached_state = NULL; |
e6dcd2dc | 4623 | char *kaddr; |
db94535d | 4624 | u32 blocksize = root->sectorsize; |
39279cc3 CM |
4625 | pgoff_t index = from >> PAGE_CACHE_SHIFT; |
4626 | unsigned offset = from & (PAGE_CACHE_SIZE-1); | |
4627 | struct page *page; | |
3b16a4e3 | 4628 | gfp_t mask = btrfs_alloc_write_mask(mapping); |
39279cc3 | 4629 | int ret = 0; |
a52d9a80 | 4630 | u64 page_start; |
e6dcd2dc | 4631 | u64 page_end; |
39279cc3 | 4632 | |
2aaa6655 JB |
4633 | if ((offset & (blocksize - 1)) == 0 && |
4634 | (!len || ((len & (blocksize - 1)) == 0))) | |
39279cc3 | 4635 | goto out; |
7cf5b976 | 4636 | ret = btrfs_delalloc_reserve_space(inode, |
df480633 | 4637 | round_down(from, PAGE_CACHE_SIZE), PAGE_CACHE_SIZE); |
5d5e103a JB |
4638 | if (ret) |
4639 | goto out; | |
39279cc3 | 4640 | |
211c17f5 | 4641 | again: |
3b16a4e3 | 4642 | page = find_or_create_page(mapping, index, mask); |
5d5e103a | 4643 | if (!page) { |
7cf5b976 | 4644 | btrfs_delalloc_release_space(inode, |
df480633 QW |
4645 | round_down(from, PAGE_CACHE_SIZE), |
4646 | PAGE_CACHE_SIZE); | |
ac6a2b36 | 4647 | ret = -ENOMEM; |
39279cc3 | 4648 | goto out; |
5d5e103a | 4649 | } |
e6dcd2dc CM |
4650 | |
4651 | page_start = page_offset(page); | |
4652 | page_end = page_start + PAGE_CACHE_SIZE - 1; | |
4653 | ||
39279cc3 | 4654 | if (!PageUptodate(page)) { |
9ebefb18 | 4655 | ret = btrfs_readpage(NULL, page); |
39279cc3 | 4656 | lock_page(page); |
211c17f5 CM |
4657 | if (page->mapping != mapping) { |
4658 | unlock_page(page); | |
4659 | page_cache_release(page); | |
4660 | goto again; | |
4661 | } | |
39279cc3 CM |
4662 | if (!PageUptodate(page)) { |
4663 | ret = -EIO; | |
89642229 | 4664 | goto out_unlock; |
39279cc3 CM |
4665 | } |
4666 | } | |
211c17f5 | 4667 | wait_on_page_writeback(page); |
e6dcd2dc | 4668 | |
ff13db41 | 4669 | lock_extent_bits(io_tree, page_start, page_end, &cached_state); |
e6dcd2dc CM |
4670 | set_page_extent_mapped(page); |
4671 | ||
4672 | ordered = btrfs_lookup_ordered_extent(inode, page_start); | |
4673 | if (ordered) { | |
2ac55d41 JB |
4674 | unlock_extent_cached(io_tree, page_start, page_end, |
4675 | &cached_state, GFP_NOFS); | |
e6dcd2dc CM |
4676 | unlock_page(page); |
4677 | page_cache_release(page); | |
eb84ae03 | 4678 | btrfs_start_ordered_extent(inode, ordered, 1); |
e6dcd2dc CM |
4679 | btrfs_put_ordered_extent(ordered); |
4680 | goto again; | |
4681 | } | |
4682 | ||
2ac55d41 | 4683 | clear_extent_bit(&BTRFS_I(inode)->io_tree, page_start, page_end, |
9e8a4a8b LB |
4684 | EXTENT_DIRTY | EXTENT_DELALLOC | |
4685 | EXTENT_DO_ACCOUNTING | EXTENT_DEFRAG, | |
2ac55d41 | 4686 | 0, 0, &cached_state, GFP_NOFS); |
5d5e103a | 4687 | |
2ac55d41 JB |
4688 | ret = btrfs_set_extent_delalloc(inode, page_start, page_end, |
4689 | &cached_state); | |
9ed74f2d | 4690 | if (ret) { |
2ac55d41 JB |
4691 | unlock_extent_cached(io_tree, page_start, page_end, |
4692 | &cached_state, GFP_NOFS); | |
9ed74f2d JB |
4693 | goto out_unlock; |
4694 | } | |
4695 | ||
e6dcd2dc | 4696 | if (offset != PAGE_CACHE_SIZE) { |
2aaa6655 JB |
4697 | if (!len) |
4698 | len = PAGE_CACHE_SIZE - offset; | |
e6dcd2dc | 4699 | kaddr = kmap(page); |
2aaa6655 JB |
4700 | if (front) |
4701 | memset(kaddr, 0, offset); | |
4702 | else | |
4703 | memset(kaddr + offset, 0, len); | |
e6dcd2dc CM |
4704 | flush_dcache_page(page); |
4705 | kunmap(page); | |
4706 | } | |
247e743c | 4707 | ClearPageChecked(page); |
e6dcd2dc | 4708 | set_page_dirty(page); |
2ac55d41 JB |
4709 | unlock_extent_cached(io_tree, page_start, page_end, &cached_state, |
4710 | GFP_NOFS); | |
39279cc3 | 4711 | |
89642229 | 4712 | out_unlock: |
5d5e103a | 4713 | if (ret) |
7cf5b976 QW |
4714 | btrfs_delalloc_release_space(inode, page_start, |
4715 | PAGE_CACHE_SIZE); | |
39279cc3 CM |
4716 | unlock_page(page); |
4717 | page_cache_release(page); | |
4718 | out: | |
4719 | return ret; | |
4720 | } | |
4721 | ||
16e7549f JB |
4722 | static int maybe_insert_hole(struct btrfs_root *root, struct inode *inode, |
4723 | u64 offset, u64 len) | |
4724 | { | |
4725 | struct btrfs_trans_handle *trans; | |
4726 | int ret; | |
4727 | ||
4728 | /* | |
4729 | * Still need to make sure the inode looks like it's been updated so | |
4730 | * that any holes get logged if we fsync. | |
4731 | */ | |
4732 | if (btrfs_fs_incompat(root->fs_info, NO_HOLES)) { | |
4733 | BTRFS_I(inode)->last_trans = root->fs_info->generation; | |
4734 | BTRFS_I(inode)->last_sub_trans = root->log_transid; | |
4735 | BTRFS_I(inode)->last_log_commit = root->last_log_commit; | |
4736 | return 0; | |
4737 | } | |
4738 | ||
4739 | /* | |
4740 | * 1 - for the one we're dropping | |
4741 | * 1 - for the one we're adding | |
4742 | * 1 - for updating the inode. | |
4743 | */ | |
4744 | trans = btrfs_start_transaction(root, 3); | |
4745 | if (IS_ERR(trans)) | |
4746 | return PTR_ERR(trans); | |
4747 | ||
4748 | ret = btrfs_drop_extents(trans, root, inode, offset, offset + len, 1); | |
4749 | if (ret) { | |
4750 | btrfs_abort_transaction(trans, root, ret); | |
4751 | btrfs_end_transaction(trans, root); | |
4752 | return ret; | |
4753 | } | |
4754 | ||
4755 | ret = btrfs_insert_file_extent(trans, root, btrfs_ino(inode), offset, | |
4756 | 0, 0, len, 0, len, 0, 0, 0); | |
4757 | if (ret) | |
4758 | btrfs_abort_transaction(trans, root, ret); | |
4759 | else | |
4760 | btrfs_update_inode(trans, root, inode); | |
4761 | btrfs_end_transaction(trans, root); | |
4762 | return ret; | |
4763 | } | |
4764 | ||
695a0d0d JB |
4765 | /* |
4766 | * This function puts in dummy file extents for the area we're creating a hole | |
4767 | * for. So if we are truncating this file to a larger size we need to insert | |
4768 | * these file extents so that btrfs_get_extent will return a EXTENT_MAP_HOLE for | |
4769 | * the range between oldsize and size | |
4770 | */ | |
a41ad394 | 4771 | int btrfs_cont_expand(struct inode *inode, loff_t oldsize, loff_t size) |
39279cc3 | 4772 | { |
9036c102 YZ |
4773 | struct btrfs_root *root = BTRFS_I(inode)->root; |
4774 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; | |
a22285a6 | 4775 | struct extent_map *em = NULL; |
2ac55d41 | 4776 | struct extent_state *cached_state = NULL; |
5dc562c5 | 4777 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; |
fda2832f QW |
4778 | u64 hole_start = ALIGN(oldsize, root->sectorsize); |
4779 | u64 block_end = ALIGN(size, root->sectorsize); | |
9036c102 YZ |
4780 | u64 last_byte; |
4781 | u64 cur_offset; | |
4782 | u64 hole_size; | |
9ed74f2d | 4783 | int err = 0; |
39279cc3 | 4784 | |
a71754fc JB |
4785 | /* |
4786 | * If our size started in the middle of a page we need to zero out the | |
4787 | * rest of the page before we expand the i_size, otherwise we could | |
4788 | * expose stale data. | |
4789 | */ | |
4790 | err = btrfs_truncate_page(inode, oldsize, 0, 0); | |
4791 | if (err) | |
4792 | return err; | |
4793 | ||
9036c102 YZ |
4794 | if (size <= hole_start) |
4795 | return 0; | |
4796 | ||
9036c102 YZ |
4797 | while (1) { |
4798 | struct btrfs_ordered_extent *ordered; | |
fa7c1494 | 4799 | |
ff13db41 | 4800 | lock_extent_bits(io_tree, hole_start, block_end - 1, |
d0082371 | 4801 | &cached_state); |
fa7c1494 MX |
4802 | ordered = btrfs_lookup_ordered_range(inode, hole_start, |
4803 | block_end - hole_start); | |
9036c102 YZ |
4804 | if (!ordered) |
4805 | break; | |
2ac55d41 JB |
4806 | unlock_extent_cached(io_tree, hole_start, block_end - 1, |
4807 | &cached_state, GFP_NOFS); | |
fa7c1494 | 4808 | btrfs_start_ordered_extent(inode, ordered, 1); |
9036c102 YZ |
4809 | btrfs_put_ordered_extent(ordered); |
4810 | } | |
39279cc3 | 4811 | |
9036c102 YZ |
4812 | cur_offset = hole_start; |
4813 | while (1) { | |
4814 | em = btrfs_get_extent(inode, NULL, 0, cur_offset, | |
4815 | block_end - cur_offset, 0); | |
79787eaa JM |
4816 | if (IS_ERR(em)) { |
4817 | err = PTR_ERR(em); | |
f2767956 | 4818 | em = NULL; |
79787eaa JM |
4819 | break; |
4820 | } | |
9036c102 | 4821 | last_byte = min(extent_map_end(em), block_end); |
fda2832f | 4822 | last_byte = ALIGN(last_byte , root->sectorsize); |
8082510e | 4823 | if (!test_bit(EXTENT_FLAG_PREALLOC, &em->flags)) { |
5dc562c5 | 4824 | struct extent_map *hole_em; |
9036c102 | 4825 | hole_size = last_byte - cur_offset; |
9ed74f2d | 4826 | |
16e7549f JB |
4827 | err = maybe_insert_hole(root, inode, cur_offset, |
4828 | hole_size); | |
4829 | if (err) | |
3893e33b | 4830 | break; |
5dc562c5 JB |
4831 | btrfs_drop_extent_cache(inode, cur_offset, |
4832 | cur_offset + hole_size - 1, 0); | |
4833 | hole_em = alloc_extent_map(); | |
4834 | if (!hole_em) { | |
4835 | set_bit(BTRFS_INODE_NEEDS_FULL_SYNC, | |
4836 | &BTRFS_I(inode)->runtime_flags); | |
4837 | goto next; | |
4838 | } | |
4839 | hole_em->start = cur_offset; | |
4840 | hole_em->len = hole_size; | |
4841 | hole_em->orig_start = cur_offset; | |
8082510e | 4842 | |
5dc562c5 JB |
4843 | hole_em->block_start = EXTENT_MAP_HOLE; |
4844 | hole_em->block_len = 0; | |
b4939680 | 4845 | hole_em->orig_block_len = 0; |
cc95bef6 | 4846 | hole_em->ram_bytes = hole_size; |
5dc562c5 JB |
4847 | hole_em->bdev = root->fs_info->fs_devices->latest_bdev; |
4848 | hole_em->compress_type = BTRFS_COMPRESS_NONE; | |
16e7549f | 4849 | hole_em->generation = root->fs_info->generation; |
8082510e | 4850 | |
5dc562c5 JB |
4851 | while (1) { |
4852 | write_lock(&em_tree->lock); | |
09a2a8f9 | 4853 | err = add_extent_mapping(em_tree, hole_em, 1); |
5dc562c5 JB |
4854 | write_unlock(&em_tree->lock); |
4855 | if (err != -EEXIST) | |
4856 | break; | |
4857 | btrfs_drop_extent_cache(inode, cur_offset, | |
4858 | cur_offset + | |
4859 | hole_size - 1, 0); | |
4860 | } | |
4861 | free_extent_map(hole_em); | |
9036c102 | 4862 | } |
16e7549f | 4863 | next: |
9036c102 | 4864 | free_extent_map(em); |
a22285a6 | 4865 | em = NULL; |
9036c102 | 4866 | cur_offset = last_byte; |
8082510e | 4867 | if (cur_offset >= block_end) |
9036c102 YZ |
4868 | break; |
4869 | } | |
a22285a6 | 4870 | free_extent_map(em); |
2ac55d41 JB |
4871 | unlock_extent_cached(io_tree, hole_start, block_end - 1, &cached_state, |
4872 | GFP_NOFS); | |
9036c102 YZ |
4873 | return err; |
4874 | } | |
39279cc3 | 4875 | |
9ea24bbe FM |
4876 | static int wait_snapshoting_atomic_t(atomic_t *a) |
4877 | { | |
4878 | schedule(); | |
4879 | return 0; | |
4880 | } | |
4881 | ||
4882 | static void wait_for_snapshot_creation(struct btrfs_root *root) | |
4883 | { | |
4884 | while (true) { | |
4885 | int ret; | |
4886 | ||
4887 | ret = btrfs_start_write_no_snapshoting(root); | |
4888 | if (ret) | |
4889 | break; | |
4890 | wait_on_atomic_t(&root->will_be_snapshoted, | |
4891 | wait_snapshoting_atomic_t, | |
4892 | TASK_UNINTERRUPTIBLE); | |
4893 | } | |
4894 | } | |
4895 | ||
3972f260 | 4896 | static int btrfs_setsize(struct inode *inode, struct iattr *attr) |
8082510e | 4897 | { |
f4a2f4c5 MX |
4898 | struct btrfs_root *root = BTRFS_I(inode)->root; |
4899 | struct btrfs_trans_handle *trans; | |
a41ad394 | 4900 | loff_t oldsize = i_size_read(inode); |
3972f260 ES |
4901 | loff_t newsize = attr->ia_size; |
4902 | int mask = attr->ia_valid; | |
8082510e YZ |
4903 | int ret; |
4904 | ||
3972f260 ES |
4905 | /* |
4906 | * The regular truncate() case without ATTR_CTIME and ATTR_MTIME is a | |
4907 | * special case where we need to update the times despite not having | |
4908 | * these flags set. For all other operations the VFS set these flags | |
4909 | * explicitly if it wants a timestamp update. | |
4910 | */ | |
dff6efc3 CH |
4911 | if (newsize != oldsize) { |
4912 | inode_inc_iversion(inode); | |
4913 | if (!(mask & (ATTR_CTIME | ATTR_MTIME))) | |
4914 | inode->i_ctime = inode->i_mtime = | |
4915 | current_fs_time(inode->i_sb); | |
4916 | } | |
3972f260 | 4917 | |
a41ad394 | 4918 | if (newsize > oldsize) { |
7caef267 | 4919 | truncate_pagecache(inode, newsize); |
9ea24bbe FM |
4920 | /* |
4921 | * Don't do an expanding truncate while snapshoting is ongoing. | |
4922 | * This is to ensure the snapshot captures a fully consistent | |
4923 | * state of this file - if the snapshot captures this expanding | |
4924 | * truncation, it must capture all writes that happened before | |
4925 | * this truncation. | |
4926 | */ | |
4927 | wait_for_snapshot_creation(root); | |
a41ad394 | 4928 | ret = btrfs_cont_expand(inode, oldsize, newsize); |
9ea24bbe FM |
4929 | if (ret) { |
4930 | btrfs_end_write_no_snapshoting(root); | |
8082510e | 4931 | return ret; |
9ea24bbe | 4932 | } |
8082510e | 4933 | |
f4a2f4c5 | 4934 | trans = btrfs_start_transaction(root, 1); |
9ea24bbe FM |
4935 | if (IS_ERR(trans)) { |
4936 | btrfs_end_write_no_snapshoting(root); | |
f4a2f4c5 | 4937 | return PTR_ERR(trans); |
9ea24bbe | 4938 | } |
f4a2f4c5 MX |
4939 | |
4940 | i_size_write(inode, newsize); | |
4941 | btrfs_ordered_update_i_size(inode, i_size_read(inode), NULL); | |
4942 | ret = btrfs_update_inode(trans, root, inode); | |
9ea24bbe | 4943 | btrfs_end_write_no_snapshoting(root); |
7ad85bb7 | 4944 | btrfs_end_transaction(trans, root); |
a41ad394 | 4945 | } else { |
8082510e | 4946 | |
a41ad394 JB |
4947 | /* |
4948 | * We're truncating a file that used to have good data down to | |
4949 | * zero. Make sure it gets into the ordered flush list so that | |
4950 | * any new writes get down to disk quickly. | |
4951 | */ | |
4952 | if (newsize == 0) | |
72ac3c0d JB |
4953 | set_bit(BTRFS_INODE_ORDERED_DATA_CLOSE, |
4954 | &BTRFS_I(inode)->runtime_flags); | |
8082510e | 4955 | |
f3fe820c JB |
4956 | /* |
4957 | * 1 for the orphan item we're going to add | |
4958 | * 1 for the orphan item deletion. | |
4959 | */ | |
4960 | trans = btrfs_start_transaction(root, 2); | |
4961 | if (IS_ERR(trans)) | |
4962 | return PTR_ERR(trans); | |
4963 | ||
4964 | /* | |
4965 | * We need to do this in case we fail at _any_ point during the | |
4966 | * actual truncate. Once we do the truncate_setsize we could | |
4967 | * invalidate pages which forces any outstanding ordered io to | |
4968 | * be instantly completed which will give us extents that need | |
4969 | * to be truncated. If we fail to get an orphan inode down we | |
4970 | * could have left over extents that were never meant to live, | |
4971 | * so we need to garuntee from this point on that everything | |
4972 | * will be consistent. | |
4973 | */ | |
4974 | ret = btrfs_orphan_add(trans, inode); | |
4975 | btrfs_end_transaction(trans, root); | |
4976 | if (ret) | |
4977 | return ret; | |
4978 | ||
a41ad394 JB |
4979 | /* we don't support swapfiles, so vmtruncate shouldn't fail */ |
4980 | truncate_setsize(inode, newsize); | |
2e60a51e MX |
4981 | |
4982 | /* Disable nonlocked read DIO to avoid the end less truncate */ | |
4983 | btrfs_inode_block_unlocked_dio(inode); | |
4984 | inode_dio_wait(inode); | |
4985 | btrfs_inode_resume_unlocked_dio(inode); | |
4986 | ||
a41ad394 | 4987 | ret = btrfs_truncate(inode); |
7f4f6e0a JB |
4988 | if (ret && inode->i_nlink) { |
4989 | int err; | |
4990 | ||
4991 | /* | |
4992 | * failed to truncate, disk_i_size is only adjusted down | |
4993 | * as we remove extents, so it should represent the true | |
4994 | * size of the inode, so reset the in memory size and | |
4995 | * delete our orphan entry. | |
4996 | */ | |
4997 | trans = btrfs_join_transaction(root); | |
4998 | if (IS_ERR(trans)) { | |
4999 | btrfs_orphan_del(NULL, inode); | |
5000 | return ret; | |
5001 | } | |
5002 | i_size_write(inode, BTRFS_I(inode)->disk_i_size); | |
5003 | err = btrfs_orphan_del(trans, inode); | |
5004 | if (err) | |
5005 | btrfs_abort_transaction(trans, root, err); | |
5006 | btrfs_end_transaction(trans, root); | |
5007 | } | |
8082510e YZ |
5008 | } |
5009 | ||
a41ad394 | 5010 | return ret; |
8082510e YZ |
5011 | } |
5012 | ||
9036c102 YZ |
5013 | static int btrfs_setattr(struct dentry *dentry, struct iattr *attr) |
5014 | { | |
2b0143b5 | 5015 | struct inode *inode = d_inode(dentry); |
b83cc969 | 5016 | struct btrfs_root *root = BTRFS_I(inode)->root; |
9036c102 | 5017 | int err; |
39279cc3 | 5018 | |
b83cc969 LZ |
5019 | if (btrfs_root_readonly(root)) |
5020 | return -EROFS; | |
5021 | ||
9036c102 YZ |
5022 | err = inode_change_ok(inode, attr); |
5023 | if (err) | |
5024 | return err; | |
2bf5a725 | 5025 | |
5a3f23d5 | 5026 | if (S_ISREG(inode->i_mode) && (attr->ia_valid & ATTR_SIZE)) { |
3972f260 | 5027 | err = btrfs_setsize(inode, attr); |
8082510e YZ |
5028 | if (err) |
5029 | return err; | |
39279cc3 | 5030 | } |
9036c102 | 5031 | |
1025774c CH |
5032 | if (attr->ia_valid) { |
5033 | setattr_copy(inode, attr); | |
0c4d2d95 | 5034 | inode_inc_iversion(inode); |
22c44fe6 | 5035 | err = btrfs_dirty_inode(inode); |
1025774c | 5036 | |
22c44fe6 | 5037 | if (!err && attr->ia_valid & ATTR_MODE) |
996a710d | 5038 | err = posix_acl_chmod(inode, inode->i_mode); |
1025774c | 5039 | } |
33268eaf | 5040 | |
39279cc3 CM |
5041 | return err; |
5042 | } | |
61295eb8 | 5043 | |
131e404a FDBM |
5044 | /* |
5045 | * While truncating the inode pages during eviction, we get the VFS calling | |
5046 | * btrfs_invalidatepage() against each page of the inode. This is slow because | |
5047 | * the calls to btrfs_invalidatepage() result in a huge amount of calls to | |
5048 | * lock_extent_bits() and clear_extent_bit(), which keep merging and splitting | |
5049 | * extent_state structures over and over, wasting lots of time. | |
5050 | * | |
5051 | * Therefore if the inode is being evicted, let btrfs_invalidatepage() skip all | |
5052 | * those expensive operations on a per page basis and do only the ordered io | |
5053 | * finishing, while we release here the extent_map and extent_state structures, | |
5054 | * without the excessive merging and splitting. | |
5055 | */ | |
5056 | static void evict_inode_truncate_pages(struct inode *inode) | |
5057 | { | |
5058 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; | |
5059 | struct extent_map_tree *map_tree = &BTRFS_I(inode)->extent_tree; | |
5060 | struct rb_node *node; | |
5061 | ||
5062 | ASSERT(inode->i_state & I_FREEING); | |
91b0abe3 | 5063 | truncate_inode_pages_final(&inode->i_data); |
131e404a FDBM |
5064 | |
5065 | write_lock(&map_tree->lock); | |
5066 | while (!RB_EMPTY_ROOT(&map_tree->map)) { | |
5067 | struct extent_map *em; | |
5068 | ||
5069 | node = rb_first(&map_tree->map); | |
5070 | em = rb_entry(node, struct extent_map, rb_node); | |
180589ef WS |
5071 | clear_bit(EXTENT_FLAG_PINNED, &em->flags); |
5072 | clear_bit(EXTENT_FLAG_LOGGING, &em->flags); | |
131e404a FDBM |
5073 | remove_extent_mapping(map_tree, em); |
5074 | free_extent_map(em); | |
7064dd5c FM |
5075 | if (need_resched()) { |
5076 | write_unlock(&map_tree->lock); | |
5077 | cond_resched(); | |
5078 | write_lock(&map_tree->lock); | |
5079 | } | |
131e404a FDBM |
5080 | } |
5081 | write_unlock(&map_tree->lock); | |
5082 | ||
6ca07097 FM |
5083 | /* |
5084 | * Keep looping until we have no more ranges in the io tree. | |
5085 | * We can have ongoing bios started by readpages (called from readahead) | |
9c6429d9 FM |
5086 | * that have their endio callback (extent_io.c:end_bio_extent_readpage) |
5087 | * still in progress (unlocked the pages in the bio but did not yet | |
5088 | * unlocked the ranges in the io tree). Therefore this means some | |
6ca07097 FM |
5089 | * ranges can still be locked and eviction started because before |
5090 | * submitting those bios, which are executed by a separate task (work | |
5091 | * queue kthread), inode references (inode->i_count) were not taken | |
5092 | * (which would be dropped in the end io callback of each bio). | |
5093 | * Therefore here we effectively end up waiting for those bios and | |
5094 | * anyone else holding locked ranges without having bumped the inode's | |
5095 | * reference count - if we don't do it, when they access the inode's | |
5096 | * io_tree to unlock a range it may be too late, leading to an | |
5097 | * use-after-free issue. | |
5098 | */ | |
131e404a FDBM |
5099 | spin_lock(&io_tree->lock); |
5100 | while (!RB_EMPTY_ROOT(&io_tree->state)) { | |
5101 | struct extent_state *state; | |
5102 | struct extent_state *cached_state = NULL; | |
6ca07097 FM |
5103 | u64 start; |
5104 | u64 end; | |
131e404a FDBM |
5105 | |
5106 | node = rb_first(&io_tree->state); | |
5107 | state = rb_entry(node, struct extent_state, rb_node); | |
6ca07097 FM |
5108 | start = state->start; |
5109 | end = state->end; | |
131e404a FDBM |
5110 | spin_unlock(&io_tree->lock); |
5111 | ||
ff13db41 | 5112 | lock_extent_bits(io_tree, start, end, &cached_state); |
b9d0b389 QW |
5113 | |
5114 | /* | |
5115 | * If still has DELALLOC flag, the extent didn't reach disk, | |
5116 | * and its reserved space won't be freed by delayed_ref. | |
5117 | * So we need to free its reserved space here. | |
5118 | * (Refer to comment in btrfs_invalidatepage, case 2) | |
5119 | * | |
5120 | * Note, end is the bytenr of last byte, so we need + 1 here. | |
5121 | */ | |
5122 | if (state->state & EXTENT_DELALLOC) | |
5123 | btrfs_qgroup_free_data(inode, start, end - start + 1); | |
5124 | ||
6ca07097 | 5125 | clear_extent_bit(io_tree, start, end, |
131e404a FDBM |
5126 | EXTENT_LOCKED | EXTENT_DIRTY | |
5127 | EXTENT_DELALLOC | EXTENT_DO_ACCOUNTING | | |
5128 | EXTENT_DEFRAG, 1, 1, | |
5129 | &cached_state, GFP_NOFS); | |
131e404a | 5130 | |
7064dd5c | 5131 | cond_resched(); |
131e404a FDBM |
5132 | spin_lock(&io_tree->lock); |
5133 | } | |
5134 | spin_unlock(&io_tree->lock); | |
5135 | } | |
5136 | ||
bd555975 | 5137 | void btrfs_evict_inode(struct inode *inode) |
39279cc3 CM |
5138 | { |
5139 | struct btrfs_trans_handle *trans; | |
5140 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
726c35fa | 5141 | struct btrfs_block_rsv *rsv, *global_rsv; |
3bce876f | 5142 | int steal_from_global = 0; |
07127184 | 5143 | u64 min_size = btrfs_calc_trunc_metadata_size(root, 1); |
39279cc3 CM |
5144 | int ret; |
5145 | ||
1abe9b8a | 5146 | trace_btrfs_inode_evict(inode); |
5147 | ||
131e404a FDBM |
5148 | evict_inode_truncate_pages(inode); |
5149 | ||
69e9c6c6 SB |
5150 | if (inode->i_nlink && |
5151 | ((btrfs_root_refs(&root->root_item) != 0 && | |
5152 | root->root_key.objectid != BTRFS_ROOT_TREE_OBJECTID) || | |
5153 | btrfs_is_free_space_inode(inode))) | |
bd555975 AV |
5154 | goto no_delete; |
5155 | ||
39279cc3 | 5156 | if (is_bad_inode(inode)) { |
7b128766 | 5157 | btrfs_orphan_del(NULL, inode); |
39279cc3 CM |
5158 | goto no_delete; |
5159 | } | |
bd555975 | 5160 | /* do we really want it for ->i_nlink > 0 and zero btrfs_root_refs? */ |
a30e577c JM |
5161 | if (!special_file(inode->i_mode)) |
5162 | btrfs_wait_ordered_range(inode, 0, (u64)-1); | |
5f39d397 | 5163 | |
f612496b MX |
5164 | btrfs_free_io_failure_record(inode, 0, (u64)-1); |
5165 | ||
c71bf099 | 5166 | if (root->fs_info->log_root_recovering) { |
6bf02314 | 5167 | BUG_ON(test_bit(BTRFS_INODE_HAS_ORPHAN_ITEM, |
8a35d95f | 5168 | &BTRFS_I(inode)->runtime_flags)); |
c71bf099 YZ |
5169 | goto no_delete; |
5170 | } | |
5171 | ||
76dda93c | 5172 | if (inode->i_nlink > 0) { |
69e9c6c6 SB |
5173 | BUG_ON(btrfs_root_refs(&root->root_item) != 0 && |
5174 | root->root_key.objectid != BTRFS_ROOT_TREE_OBJECTID); | |
76dda93c YZ |
5175 | goto no_delete; |
5176 | } | |
5177 | ||
0e8c36a9 MX |
5178 | ret = btrfs_commit_inode_delayed_inode(inode); |
5179 | if (ret) { | |
5180 | btrfs_orphan_del(NULL, inode); | |
5181 | goto no_delete; | |
5182 | } | |
5183 | ||
66d8f3dd | 5184 | rsv = btrfs_alloc_block_rsv(root, BTRFS_BLOCK_RSV_TEMP); |
4289a667 JB |
5185 | if (!rsv) { |
5186 | btrfs_orphan_del(NULL, inode); | |
5187 | goto no_delete; | |
5188 | } | |
4a338542 | 5189 | rsv->size = min_size; |
ca7e70f5 | 5190 | rsv->failfast = 1; |
726c35fa | 5191 | global_rsv = &root->fs_info->global_block_rsv; |
4289a667 | 5192 | |
dbe674a9 | 5193 | btrfs_i_size_write(inode, 0); |
5f39d397 | 5194 | |
4289a667 | 5195 | /* |
8407aa46 MX |
5196 | * This is a bit simpler than btrfs_truncate since we've already |
5197 | * reserved our space for our orphan item in the unlink, so we just | |
5198 | * need to reserve some slack space in case we add bytes and update | |
5199 | * inode item when doing the truncate. | |
4289a667 | 5200 | */ |
8082510e | 5201 | while (1) { |
08e007d2 MX |
5202 | ret = btrfs_block_rsv_refill(root, rsv, min_size, |
5203 | BTRFS_RESERVE_FLUSH_LIMIT); | |
726c35fa JB |
5204 | |
5205 | /* | |
5206 | * Try and steal from the global reserve since we will | |
5207 | * likely not use this space anyway, we want to try as | |
5208 | * hard as possible to get this to work. | |
5209 | */ | |
5210 | if (ret) | |
3bce876f JB |
5211 | steal_from_global++; |
5212 | else | |
5213 | steal_from_global = 0; | |
5214 | ret = 0; | |
d68fc57b | 5215 | |
3bce876f JB |
5216 | /* |
5217 | * steal_from_global == 0: we reserved stuff, hooray! | |
5218 | * steal_from_global == 1: we didn't reserve stuff, boo! | |
5219 | * steal_from_global == 2: we've committed, still not a lot of | |
5220 | * room but maybe we'll have room in the global reserve this | |
5221 | * time. | |
5222 | * steal_from_global == 3: abandon all hope! | |
5223 | */ | |
5224 | if (steal_from_global > 2) { | |
c2cf52eb SK |
5225 | btrfs_warn(root->fs_info, |
5226 | "Could not get space for a delete, will truncate on mount %d", | |
5227 | ret); | |
4289a667 JB |
5228 | btrfs_orphan_del(NULL, inode); |
5229 | btrfs_free_block_rsv(root, rsv); | |
5230 | goto no_delete; | |
d68fc57b | 5231 | } |
7b128766 | 5232 | |
0e8c36a9 | 5233 | trans = btrfs_join_transaction(root); |
4289a667 JB |
5234 | if (IS_ERR(trans)) { |
5235 | btrfs_orphan_del(NULL, inode); | |
5236 | btrfs_free_block_rsv(root, rsv); | |
5237 | goto no_delete; | |
d68fc57b | 5238 | } |
7b128766 | 5239 | |
3bce876f JB |
5240 | /* |
5241 | * We can't just steal from the global reserve, we need tomake | |
5242 | * sure there is room to do it, if not we need to commit and try | |
5243 | * again. | |
5244 | */ | |
5245 | if (steal_from_global) { | |
5246 | if (!btrfs_check_space_for_delayed_refs(trans, root)) | |
5247 | ret = btrfs_block_rsv_migrate(global_rsv, rsv, | |
5248 | min_size); | |
5249 | else | |
5250 | ret = -ENOSPC; | |
5251 | } | |
5252 | ||
5253 | /* | |
5254 | * Couldn't steal from the global reserve, we have too much | |
5255 | * pending stuff built up, commit the transaction and try it | |
5256 | * again. | |
5257 | */ | |
5258 | if (ret) { | |
5259 | ret = btrfs_commit_transaction(trans, root); | |
5260 | if (ret) { | |
5261 | btrfs_orphan_del(NULL, inode); | |
5262 | btrfs_free_block_rsv(root, rsv); | |
5263 | goto no_delete; | |
5264 | } | |
5265 | continue; | |
5266 | } else { | |
5267 | steal_from_global = 0; | |
5268 | } | |
5269 | ||
4289a667 JB |
5270 | trans->block_rsv = rsv; |
5271 | ||
d68fc57b | 5272 | ret = btrfs_truncate_inode_items(trans, root, inode, 0, 0); |
28ed1345 | 5273 | if (ret != -ENOSPC && ret != -EAGAIN) |
8082510e | 5274 | break; |
85e21bac | 5275 | |
8407aa46 | 5276 | trans->block_rsv = &root->fs_info->trans_block_rsv; |
8082510e YZ |
5277 | btrfs_end_transaction(trans, root); |
5278 | trans = NULL; | |
b53d3f5d | 5279 | btrfs_btree_balance_dirty(root); |
8082510e | 5280 | } |
5f39d397 | 5281 | |
4289a667 JB |
5282 | btrfs_free_block_rsv(root, rsv); |
5283 | ||
4ef31a45 JB |
5284 | /* |
5285 | * Errors here aren't a big deal, it just means we leave orphan items | |
5286 | * in the tree. They will be cleaned up on the next mount. | |
5287 | */ | |
8082510e | 5288 | if (ret == 0) { |
4289a667 | 5289 | trans->block_rsv = root->orphan_block_rsv; |
4ef31a45 JB |
5290 | btrfs_orphan_del(trans, inode); |
5291 | } else { | |
5292 | btrfs_orphan_del(NULL, inode); | |
8082510e | 5293 | } |
54aa1f4d | 5294 | |
4289a667 | 5295 | trans->block_rsv = &root->fs_info->trans_block_rsv; |
581bb050 LZ |
5296 | if (!(root == root->fs_info->tree_root || |
5297 | root->root_key.objectid == BTRFS_TREE_RELOC_OBJECTID)) | |
33345d01 | 5298 | btrfs_return_ino(root, btrfs_ino(inode)); |
581bb050 | 5299 | |
54aa1f4d | 5300 | btrfs_end_transaction(trans, root); |
b53d3f5d | 5301 | btrfs_btree_balance_dirty(root); |
39279cc3 | 5302 | no_delete: |
89042e5a | 5303 | btrfs_remove_delayed_node(inode); |
dbd5768f | 5304 | clear_inode(inode); |
39279cc3 CM |
5305 | } |
5306 | ||
5307 | /* | |
5308 | * this returns the key found in the dir entry in the location pointer. | |
5309 | * If no dir entries were found, location->objectid is 0. | |
5310 | */ | |
5311 | static int btrfs_inode_by_name(struct inode *dir, struct dentry *dentry, | |
5312 | struct btrfs_key *location) | |
5313 | { | |
5314 | const char *name = dentry->d_name.name; | |
5315 | int namelen = dentry->d_name.len; | |
5316 | struct btrfs_dir_item *di; | |
5317 | struct btrfs_path *path; | |
5318 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
0d9f7f3e | 5319 | int ret = 0; |
39279cc3 CM |
5320 | |
5321 | path = btrfs_alloc_path(); | |
d8926bb3 MF |
5322 | if (!path) |
5323 | return -ENOMEM; | |
3954401f | 5324 | |
33345d01 | 5325 | di = btrfs_lookup_dir_item(NULL, root, path, btrfs_ino(dir), name, |
39279cc3 | 5326 | namelen, 0); |
0d9f7f3e Y |
5327 | if (IS_ERR(di)) |
5328 | ret = PTR_ERR(di); | |
d397712b | 5329 | |
c704005d | 5330 | if (IS_ERR_OR_NULL(di)) |
3954401f | 5331 | goto out_err; |
d397712b | 5332 | |
5f39d397 | 5333 | btrfs_dir_item_key_to_cpu(path->nodes[0], di, location); |
39279cc3 | 5334 | out: |
39279cc3 CM |
5335 | btrfs_free_path(path); |
5336 | return ret; | |
3954401f CM |
5337 | out_err: |
5338 | location->objectid = 0; | |
5339 | goto out; | |
39279cc3 CM |
5340 | } |
5341 | ||
5342 | /* | |
5343 | * when we hit a tree root in a directory, the btrfs part of the inode | |
5344 | * needs to be changed to reflect the root directory of the tree root. This | |
5345 | * is kind of like crossing a mount point. | |
5346 | */ | |
5347 | static int fixup_tree_root_location(struct btrfs_root *root, | |
4df27c4d YZ |
5348 | struct inode *dir, |
5349 | struct dentry *dentry, | |
5350 | struct btrfs_key *location, | |
5351 | struct btrfs_root **sub_root) | |
39279cc3 | 5352 | { |
4df27c4d YZ |
5353 | struct btrfs_path *path; |
5354 | struct btrfs_root *new_root; | |
5355 | struct btrfs_root_ref *ref; | |
5356 | struct extent_buffer *leaf; | |
1d4c08e0 | 5357 | struct btrfs_key key; |
4df27c4d YZ |
5358 | int ret; |
5359 | int err = 0; | |
39279cc3 | 5360 | |
4df27c4d YZ |
5361 | path = btrfs_alloc_path(); |
5362 | if (!path) { | |
5363 | err = -ENOMEM; | |
5364 | goto out; | |
5365 | } | |
39279cc3 | 5366 | |
4df27c4d | 5367 | err = -ENOENT; |
1d4c08e0 DS |
5368 | key.objectid = BTRFS_I(dir)->root->root_key.objectid; |
5369 | key.type = BTRFS_ROOT_REF_KEY; | |
5370 | key.offset = location->objectid; | |
5371 | ||
5372 | ret = btrfs_search_slot(NULL, root->fs_info->tree_root, &key, path, | |
5373 | 0, 0); | |
4df27c4d YZ |
5374 | if (ret) { |
5375 | if (ret < 0) | |
5376 | err = ret; | |
5377 | goto out; | |
5378 | } | |
39279cc3 | 5379 | |
4df27c4d YZ |
5380 | leaf = path->nodes[0]; |
5381 | ref = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_root_ref); | |
33345d01 | 5382 | if (btrfs_root_ref_dirid(leaf, ref) != btrfs_ino(dir) || |
4df27c4d YZ |
5383 | btrfs_root_ref_name_len(leaf, ref) != dentry->d_name.len) |
5384 | goto out; | |
39279cc3 | 5385 | |
4df27c4d YZ |
5386 | ret = memcmp_extent_buffer(leaf, dentry->d_name.name, |
5387 | (unsigned long)(ref + 1), | |
5388 | dentry->d_name.len); | |
5389 | if (ret) | |
5390 | goto out; | |
5391 | ||
b3b4aa74 | 5392 | btrfs_release_path(path); |
4df27c4d YZ |
5393 | |
5394 | new_root = btrfs_read_fs_root_no_name(root->fs_info, location); | |
5395 | if (IS_ERR(new_root)) { | |
5396 | err = PTR_ERR(new_root); | |
5397 | goto out; | |
5398 | } | |
5399 | ||
4df27c4d YZ |
5400 | *sub_root = new_root; |
5401 | location->objectid = btrfs_root_dirid(&new_root->root_item); | |
5402 | location->type = BTRFS_INODE_ITEM_KEY; | |
5403 | location->offset = 0; | |
5404 | err = 0; | |
5405 | out: | |
5406 | btrfs_free_path(path); | |
5407 | return err; | |
39279cc3 CM |
5408 | } |
5409 | ||
5d4f98a2 YZ |
5410 | static void inode_tree_add(struct inode *inode) |
5411 | { | |
5412 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
5413 | struct btrfs_inode *entry; | |
03e860bd FNP |
5414 | struct rb_node **p; |
5415 | struct rb_node *parent; | |
cef21937 | 5416 | struct rb_node *new = &BTRFS_I(inode)->rb_node; |
33345d01 | 5417 | u64 ino = btrfs_ino(inode); |
5d4f98a2 | 5418 | |
1d3382cb | 5419 | if (inode_unhashed(inode)) |
76dda93c | 5420 | return; |
e1409cef | 5421 | parent = NULL; |
5d4f98a2 | 5422 | spin_lock(&root->inode_lock); |
e1409cef | 5423 | p = &root->inode_tree.rb_node; |
5d4f98a2 YZ |
5424 | while (*p) { |
5425 | parent = *p; | |
5426 | entry = rb_entry(parent, struct btrfs_inode, rb_node); | |
5427 | ||
33345d01 | 5428 | if (ino < btrfs_ino(&entry->vfs_inode)) |
03e860bd | 5429 | p = &parent->rb_left; |
33345d01 | 5430 | else if (ino > btrfs_ino(&entry->vfs_inode)) |
03e860bd | 5431 | p = &parent->rb_right; |
5d4f98a2 YZ |
5432 | else { |
5433 | WARN_ON(!(entry->vfs_inode.i_state & | |
a4ffdde6 | 5434 | (I_WILL_FREE | I_FREEING))); |
cef21937 | 5435 | rb_replace_node(parent, new, &root->inode_tree); |
03e860bd FNP |
5436 | RB_CLEAR_NODE(parent); |
5437 | spin_unlock(&root->inode_lock); | |
cef21937 | 5438 | return; |
5d4f98a2 YZ |
5439 | } |
5440 | } | |
cef21937 FDBM |
5441 | rb_link_node(new, parent, p); |
5442 | rb_insert_color(new, &root->inode_tree); | |
5d4f98a2 YZ |
5443 | spin_unlock(&root->inode_lock); |
5444 | } | |
5445 | ||
5446 | static void inode_tree_del(struct inode *inode) | |
5447 | { | |
5448 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
76dda93c | 5449 | int empty = 0; |
5d4f98a2 | 5450 | |
03e860bd | 5451 | spin_lock(&root->inode_lock); |
5d4f98a2 | 5452 | if (!RB_EMPTY_NODE(&BTRFS_I(inode)->rb_node)) { |
5d4f98a2 | 5453 | rb_erase(&BTRFS_I(inode)->rb_node, &root->inode_tree); |
5d4f98a2 | 5454 | RB_CLEAR_NODE(&BTRFS_I(inode)->rb_node); |
76dda93c | 5455 | empty = RB_EMPTY_ROOT(&root->inode_tree); |
5d4f98a2 | 5456 | } |
03e860bd | 5457 | spin_unlock(&root->inode_lock); |
76dda93c | 5458 | |
69e9c6c6 | 5459 | if (empty && btrfs_root_refs(&root->root_item) == 0) { |
76dda93c YZ |
5460 | synchronize_srcu(&root->fs_info->subvol_srcu); |
5461 | spin_lock(&root->inode_lock); | |
5462 | empty = RB_EMPTY_ROOT(&root->inode_tree); | |
5463 | spin_unlock(&root->inode_lock); | |
5464 | if (empty) | |
5465 | btrfs_add_dead_root(root); | |
5466 | } | |
5467 | } | |
5468 | ||
143bede5 | 5469 | void btrfs_invalidate_inodes(struct btrfs_root *root) |
76dda93c YZ |
5470 | { |
5471 | struct rb_node *node; | |
5472 | struct rb_node *prev; | |
5473 | struct btrfs_inode *entry; | |
5474 | struct inode *inode; | |
5475 | u64 objectid = 0; | |
5476 | ||
7813b3db LB |
5477 | if (!test_bit(BTRFS_FS_STATE_ERROR, &root->fs_info->fs_state)) |
5478 | WARN_ON(btrfs_root_refs(&root->root_item) != 0); | |
76dda93c YZ |
5479 | |
5480 | spin_lock(&root->inode_lock); | |
5481 | again: | |
5482 | node = root->inode_tree.rb_node; | |
5483 | prev = NULL; | |
5484 | while (node) { | |
5485 | prev = node; | |
5486 | entry = rb_entry(node, struct btrfs_inode, rb_node); | |
5487 | ||
33345d01 | 5488 | if (objectid < btrfs_ino(&entry->vfs_inode)) |
76dda93c | 5489 | node = node->rb_left; |
33345d01 | 5490 | else if (objectid > btrfs_ino(&entry->vfs_inode)) |
76dda93c YZ |
5491 | node = node->rb_right; |
5492 | else | |
5493 | break; | |
5494 | } | |
5495 | if (!node) { | |
5496 | while (prev) { | |
5497 | entry = rb_entry(prev, struct btrfs_inode, rb_node); | |
33345d01 | 5498 | if (objectid <= btrfs_ino(&entry->vfs_inode)) { |
76dda93c YZ |
5499 | node = prev; |
5500 | break; | |
5501 | } | |
5502 | prev = rb_next(prev); | |
5503 | } | |
5504 | } | |
5505 | while (node) { | |
5506 | entry = rb_entry(node, struct btrfs_inode, rb_node); | |
33345d01 | 5507 | objectid = btrfs_ino(&entry->vfs_inode) + 1; |
76dda93c YZ |
5508 | inode = igrab(&entry->vfs_inode); |
5509 | if (inode) { | |
5510 | spin_unlock(&root->inode_lock); | |
5511 | if (atomic_read(&inode->i_count) > 1) | |
5512 | d_prune_aliases(inode); | |
5513 | /* | |
45321ac5 | 5514 | * btrfs_drop_inode will have it removed from |
76dda93c YZ |
5515 | * the inode cache when its usage count |
5516 | * hits zero. | |
5517 | */ | |
5518 | iput(inode); | |
5519 | cond_resched(); | |
5520 | spin_lock(&root->inode_lock); | |
5521 | goto again; | |
5522 | } | |
5523 | ||
5524 | if (cond_resched_lock(&root->inode_lock)) | |
5525 | goto again; | |
5526 | ||
5527 | node = rb_next(node); | |
5528 | } | |
5529 | spin_unlock(&root->inode_lock); | |
5d4f98a2 YZ |
5530 | } |
5531 | ||
e02119d5 CM |
5532 | static int btrfs_init_locked_inode(struct inode *inode, void *p) |
5533 | { | |
5534 | struct btrfs_iget_args *args = p; | |
90d3e592 CM |
5535 | inode->i_ino = args->location->objectid; |
5536 | memcpy(&BTRFS_I(inode)->location, args->location, | |
5537 | sizeof(*args->location)); | |
e02119d5 | 5538 | BTRFS_I(inode)->root = args->root; |
39279cc3 CM |
5539 | return 0; |
5540 | } | |
5541 | ||
5542 | static int btrfs_find_actor(struct inode *inode, void *opaque) | |
5543 | { | |
5544 | struct btrfs_iget_args *args = opaque; | |
90d3e592 | 5545 | return args->location->objectid == BTRFS_I(inode)->location.objectid && |
d397712b | 5546 | args->root == BTRFS_I(inode)->root; |
39279cc3 CM |
5547 | } |
5548 | ||
5d4f98a2 | 5549 | static struct inode *btrfs_iget_locked(struct super_block *s, |
90d3e592 | 5550 | struct btrfs_key *location, |
5d4f98a2 | 5551 | struct btrfs_root *root) |
39279cc3 CM |
5552 | { |
5553 | struct inode *inode; | |
5554 | struct btrfs_iget_args args; | |
90d3e592 | 5555 | unsigned long hashval = btrfs_inode_hash(location->objectid, root); |
778ba82b | 5556 | |
90d3e592 | 5557 | args.location = location; |
39279cc3 CM |
5558 | args.root = root; |
5559 | ||
778ba82b | 5560 | inode = iget5_locked(s, hashval, btrfs_find_actor, |
39279cc3 CM |
5561 | btrfs_init_locked_inode, |
5562 | (void *)&args); | |
5563 | return inode; | |
5564 | } | |
5565 | ||
1a54ef8c BR |
5566 | /* Get an inode object given its location and corresponding root. |
5567 | * Returns in *is_new if the inode was read from disk | |
5568 | */ | |
5569 | struct inode *btrfs_iget(struct super_block *s, struct btrfs_key *location, | |
73f73415 | 5570 | struct btrfs_root *root, int *new) |
1a54ef8c BR |
5571 | { |
5572 | struct inode *inode; | |
5573 | ||
90d3e592 | 5574 | inode = btrfs_iget_locked(s, location, root); |
1a54ef8c | 5575 | if (!inode) |
5d4f98a2 | 5576 | return ERR_PTR(-ENOMEM); |
1a54ef8c BR |
5577 | |
5578 | if (inode->i_state & I_NEW) { | |
1a54ef8c | 5579 | btrfs_read_locked_inode(inode); |
1748f843 MF |
5580 | if (!is_bad_inode(inode)) { |
5581 | inode_tree_add(inode); | |
5582 | unlock_new_inode(inode); | |
5583 | if (new) | |
5584 | *new = 1; | |
5585 | } else { | |
e0b6d65b ST |
5586 | unlock_new_inode(inode); |
5587 | iput(inode); | |
5588 | inode = ERR_PTR(-ESTALE); | |
1748f843 MF |
5589 | } |
5590 | } | |
5591 | ||
1a54ef8c BR |
5592 | return inode; |
5593 | } | |
5594 | ||
4df27c4d YZ |
5595 | static struct inode *new_simple_dir(struct super_block *s, |
5596 | struct btrfs_key *key, | |
5597 | struct btrfs_root *root) | |
5598 | { | |
5599 | struct inode *inode = new_inode(s); | |
5600 | ||
5601 | if (!inode) | |
5602 | return ERR_PTR(-ENOMEM); | |
5603 | ||
4df27c4d YZ |
5604 | BTRFS_I(inode)->root = root; |
5605 | memcpy(&BTRFS_I(inode)->location, key, sizeof(*key)); | |
72ac3c0d | 5606 | set_bit(BTRFS_INODE_DUMMY, &BTRFS_I(inode)->runtime_flags); |
4df27c4d YZ |
5607 | |
5608 | inode->i_ino = BTRFS_EMPTY_SUBVOL_DIR_OBJECTID; | |
848cce0d | 5609 | inode->i_op = &btrfs_dir_ro_inode_operations; |
4df27c4d YZ |
5610 | inode->i_fop = &simple_dir_operations; |
5611 | inode->i_mode = S_IFDIR | S_IRUGO | S_IWUSR | S_IXUGO; | |
9cc97d64 | 5612 | inode->i_mtime = CURRENT_TIME; |
5613 | inode->i_atime = inode->i_mtime; | |
5614 | inode->i_ctime = inode->i_mtime; | |
5615 | BTRFS_I(inode)->i_otime = inode->i_mtime; | |
4df27c4d YZ |
5616 | |
5617 | return inode; | |
5618 | } | |
5619 | ||
3de4586c | 5620 | struct inode *btrfs_lookup_dentry(struct inode *dir, struct dentry *dentry) |
39279cc3 | 5621 | { |
d397712b | 5622 | struct inode *inode; |
4df27c4d | 5623 | struct btrfs_root *root = BTRFS_I(dir)->root; |
39279cc3 CM |
5624 | struct btrfs_root *sub_root = root; |
5625 | struct btrfs_key location; | |
76dda93c | 5626 | int index; |
b4aff1f8 | 5627 | int ret = 0; |
39279cc3 CM |
5628 | |
5629 | if (dentry->d_name.len > BTRFS_NAME_LEN) | |
5630 | return ERR_PTR(-ENAMETOOLONG); | |
5f39d397 | 5631 | |
39e3c955 | 5632 | ret = btrfs_inode_by_name(dir, dentry, &location); |
39279cc3 CM |
5633 | if (ret < 0) |
5634 | return ERR_PTR(ret); | |
5f39d397 | 5635 | |
4df27c4d | 5636 | if (location.objectid == 0) |
5662344b | 5637 | return ERR_PTR(-ENOENT); |
4df27c4d YZ |
5638 | |
5639 | if (location.type == BTRFS_INODE_ITEM_KEY) { | |
73f73415 | 5640 | inode = btrfs_iget(dir->i_sb, &location, root, NULL); |
4df27c4d YZ |
5641 | return inode; |
5642 | } | |
5643 | ||
5644 | BUG_ON(location.type != BTRFS_ROOT_ITEM_KEY); | |
5645 | ||
76dda93c | 5646 | index = srcu_read_lock(&root->fs_info->subvol_srcu); |
4df27c4d YZ |
5647 | ret = fixup_tree_root_location(root, dir, dentry, |
5648 | &location, &sub_root); | |
5649 | if (ret < 0) { | |
5650 | if (ret != -ENOENT) | |
5651 | inode = ERR_PTR(ret); | |
5652 | else | |
5653 | inode = new_simple_dir(dir->i_sb, &location, sub_root); | |
5654 | } else { | |
73f73415 | 5655 | inode = btrfs_iget(dir->i_sb, &location, sub_root, NULL); |
39279cc3 | 5656 | } |
76dda93c YZ |
5657 | srcu_read_unlock(&root->fs_info->subvol_srcu, index); |
5658 | ||
34d19bad | 5659 | if (!IS_ERR(inode) && root != sub_root) { |
c71bf099 YZ |
5660 | down_read(&root->fs_info->cleanup_work_sem); |
5661 | if (!(inode->i_sb->s_flags & MS_RDONLY)) | |
66b4ffd1 | 5662 | ret = btrfs_orphan_cleanup(sub_root); |
c71bf099 | 5663 | up_read(&root->fs_info->cleanup_work_sem); |
01cd3367 JB |
5664 | if (ret) { |
5665 | iput(inode); | |
66b4ffd1 | 5666 | inode = ERR_PTR(ret); |
01cd3367 | 5667 | } |
c71bf099 YZ |
5668 | } |
5669 | ||
3de4586c CM |
5670 | return inode; |
5671 | } | |
5672 | ||
fe15ce44 | 5673 | static int btrfs_dentry_delete(const struct dentry *dentry) |
76dda93c YZ |
5674 | { |
5675 | struct btrfs_root *root; | |
2b0143b5 | 5676 | struct inode *inode = d_inode(dentry); |
76dda93c | 5677 | |
848cce0d | 5678 | if (!inode && !IS_ROOT(dentry)) |
2b0143b5 | 5679 | inode = d_inode(dentry->d_parent); |
76dda93c | 5680 | |
848cce0d LZ |
5681 | if (inode) { |
5682 | root = BTRFS_I(inode)->root; | |
efefb143 YZ |
5683 | if (btrfs_root_refs(&root->root_item) == 0) |
5684 | return 1; | |
848cce0d LZ |
5685 | |
5686 | if (btrfs_ino(inode) == BTRFS_EMPTY_SUBVOL_DIR_OBJECTID) | |
5687 | return 1; | |
efefb143 | 5688 | } |
76dda93c YZ |
5689 | return 0; |
5690 | } | |
5691 | ||
b4aff1f8 JB |
5692 | static void btrfs_dentry_release(struct dentry *dentry) |
5693 | { | |
944a4515 | 5694 | kfree(dentry->d_fsdata); |
b4aff1f8 JB |
5695 | } |
5696 | ||
3de4586c | 5697 | static struct dentry *btrfs_lookup(struct inode *dir, struct dentry *dentry, |
00cd8dd3 | 5698 | unsigned int flags) |
3de4586c | 5699 | { |
5662344b | 5700 | struct inode *inode; |
a66e7cc6 | 5701 | |
5662344b TI |
5702 | inode = btrfs_lookup_dentry(dir, dentry); |
5703 | if (IS_ERR(inode)) { | |
5704 | if (PTR_ERR(inode) == -ENOENT) | |
5705 | inode = NULL; | |
5706 | else | |
5707 | return ERR_CAST(inode); | |
5708 | } | |
5709 | ||
41d28bca | 5710 | return d_splice_alias(inode, dentry); |
39279cc3 CM |
5711 | } |
5712 | ||
16cdcec7 | 5713 | unsigned char btrfs_filetype_table[] = { |
39279cc3 CM |
5714 | DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK |
5715 | }; | |
5716 | ||
9cdda8d3 | 5717 | static int btrfs_real_readdir(struct file *file, struct dir_context *ctx) |
39279cc3 | 5718 | { |
9cdda8d3 | 5719 | struct inode *inode = file_inode(file); |
39279cc3 CM |
5720 | struct btrfs_root *root = BTRFS_I(inode)->root; |
5721 | struct btrfs_item *item; | |
5722 | struct btrfs_dir_item *di; | |
5723 | struct btrfs_key key; | |
5f39d397 | 5724 | struct btrfs_key found_key; |
39279cc3 | 5725 | struct btrfs_path *path; |
16cdcec7 MX |
5726 | struct list_head ins_list; |
5727 | struct list_head del_list; | |
39279cc3 | 5728 | int ret; |
5f39d397 | 5729 | struct extent_buffer *leaf; |
39279cc3 | 5730 | int slot; |
39279cc3 CM |
5731 | unsigned char d_type; |
5732 | int over = 0; | |
5733 | u32 di_cur; | |
5734 | u32 di_total; | |
5735 | u32 di_len; | |
5736 | int key_type = BTRFS_DIR_INDEX_KEY; | |
5f39d397 CM |
5737 | char tmp_name[32]; |
5738 | char *name_ptr; | |
5739 | int name_len; | |
9cdda8d3 | 5740 | int is_curr = 0; /* ctx->pos points to the current index? */ |
39279cc3 CM |
5741 | |
5742 | /* FIXME, use a real flag for deciding about the key type */ | |
5743 | if (root->fs_info->tree_root == root) | |
5744 | key_type = BTRFS_DIR_ITEM_KEY; | |
5f39d397 | 5745 | |
9cdda8d3 AV |
5746 | if (!dir_emit_dots(file, ctx)) |
5747 | return 0; | |
5748 | ||
49593bfa | 5749 | path = btrfs_alloc_path(); |
16cdcec7 MX |
5750 | if (!path) |
5751 | return -ENOMEM; | |
ff5714cc | 5752 | |
e4058b54 | 5753 | path->reada = READA_FORWARD; |
49593bfa | 5754 | |
16cdcec7 MX |
5755 | if (key_type == BTRFS_DIR_INDEX_KEY) { |
5756 | INIT_LIST_HEAD(&ins_list); | |
5757 | INIT_LIST_HEAD(&del_list); | |
5758 | btrfs_get_delayed_items(inode, &ins_list, &del_list); | |
5759 | } | |
5760 | ||
962a298f | 5761 | key.type = key_type; |
9cdda8d3 | 5762 | key.offset = ctx->pos; |
33345d01 | 5763 | key.objectid = btrfs_ino(inode); |
5f39d397 | 5764 | |
39279cc3 CM |
5765 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); |
5766 | if (ret < 0) | |
5767 | goto err; | |
49593bfa DW |
5768 | |
5769 | while (1) { | |
5f39d397 | 5770 | leaf = path->nodes[0]; |
39279cc3 | 5771 | slot = path->slots[0]; |
b9e03af0 LZ |
5772 | if (slot >= btrfs_header_nritems(leaf)) { |
5773 | ret = btrfs_next_leaf(root, path); | |
5774 | if (ret < 0) | |
5775 | goto err; | |
5776 | else if (ret > 0) | |
5777 | break; | |
5778 | continue; | |
39279cc3 | 5779 | } |
3de4586c | 5780 | |
dd3cc16b | 5781 | item = btrfs_item_nr(slot); |
5f39d397 CM |
5782 | btrfs_item_key_to_cpu(leaf, &found_key, slot); |
5783 | ||
5784 | if (found_key.objectid != key.objectid) | |
39279cc3 | 5785 | break; |
962a298f | 5786 | if (found_key.type != key_type) |
39279cc3 | 5787 | break; |
9cdda8d3 | 5788 | if (found_key.offset < ctx->pos) |
b9e03af0 | 5789 | goto next; |
16cdcec7 MX |
5790 | if (key_type == BTRFS_DIR_INDEX_KEY && |
5791 | btrfs_should_delete_dir_index(&del_list, | |
5792 | found_key.offset)) | |
5793 | goto next; | |
5f39d397 | 5794 | |
9cdda8d3 | 5795 | ctx->pos = found_key.offset; |
16cdcec7 | 5796 | is_curr = 1; |
49593bfa | 5797 | |
39279cc3 CM |
5798 | di = btrfs_item_ptr(leaf, slot, struct btrfs_dir_item); |
5799 | di_cur = 0; | |
5f39d397 | 5800 | di_total = btrfs_item_size(leaf, item); |
49593bfa DW |
5801 | |
5802 | while (di_cur < di_total) { | |
5f39d397 CM |
5803 | struct btrfs_key location; |
5804 | ||
22a94d44 JB |
5805 | if (verify_dir_item(root, leaf, di)) |
5806 | break; | |
5807 | ||
5f39d397 | 5808 | name_len = btrfs_dir_name_len(leaf, di); |
49593bfa | 5809 | if (name_len <= sizeof(tmp_name)) { |
5f39d397 CM |
5810 | name_ptr = tmp_name; |
5811 | } else { | |
5812 | name_ptr = kmalloc(name_len, GFP_NOFS); | |
49593bfa DW |
5813 | if (!name_ptr) { |
5814 | ret = -ENOMEM; | |
5815 | goto err; | |
5816 | } | |
5f39d397 CM |
5817 | } |
5818 | read_extent_buffer(leaf, name_ptr, | |
5819 | (unsigned long)(di + 1), name_len); | |
5820 | ||
5821 | d_type = btrfs_filetype_table[btrfs_dir_type(leaf, di)]; | |
5822 | btrfs_dir_item_key_to_cpu(leaf, di, &location); | |
3de4586c | 5823 | |
fede766f | 5824 | |
3de4586c | 5825 | /* is this a reference to our own snapshot? If so |
8c9c2bf7 AJ |
5826 | * skip it. |
5827 | * | |
5828 | * In contrast to old kernels, we insert the snapshot's | |
5829 | * dir item and dir index after it has been created, so | |
5830 | * we won't find a reference to our own snapshot. We | |
5831 | * still keep the following code for backward | |
5832 | * compatibility. | |
3de4586c CM |
5833 | */ |
5834 | if (location.type == BTRFS_ROOT_ITEM_KEY && | |
5835 | location.objectid == root->root_key.objectid) { | |
5836 | over = 0; | |
5837 | goto skip; | |
5838 | } | |
9cdda8d3 AV |
5839 | over = !dir_emit(ctx, name_ptr, name_len, |
5840 | location.objectid, d_type); | |
5f39d397 | 5841 | |
3de4586c | 5842 | skip: |
5f39d397 CM |
5843 | if (name_ptr != tmp_name) |
5844 | kfree(name_ptr); | |
5845 | ||
39279cc3 CM |
5846 | if (over) |
5847 | goto nopos; | |
5103e947 | 5848 | di_len = btrfs_dir_name_len(leaf, di) + |
49593bfa | 5849 | btrfs_dir_data_len(leaf, di) + sizeof(*di); |
39279cc3 CM |
5850 | di_cur += di_len; |
5851 | di = (struct btrfs_dir_item *)((char *)di + di_len); | |
5852 | } | |
b9e03af0 LZ |
5853 | next: |
5854 | path->slots[0]++; | |
39279cc3 | 5855 | } |
49593bfa | 5856 | |
16cdcec7 MX |
5857 | if (key_type == BTRFS_DIR_INDEX_KEY) { |
5858 | if (is_curr) | |
9cdda8d3 AV |
5859 | ctx->pos++; |
5860 | ret = btrfs_readdir_delayed_dir_index(ctx, &ins_list); | |
16cdcec7 MX |
5861 | if (ret) |
5862 | goto nopos; | |
5863 | } | |
5864 | ||
49593bfa | 5865 | /* Reached end of directory/root. Bump pos past the last item. */ |
db62efbb ZB |
5866 | ctx->pos++; |
5867 | ||
5868 | /* | |
5869 | * Stop new entries from being returned after we return the last | |
5870 | * entry. | |
5871 | * | |
5872 | * New directory entries are assigned a strictly increasing | |
5873 | * offset. This means that new entries created during readdir | |
5874 | * are *guaranteed* to be seen in the future by that readdir. | |
5875 | * This has broken buggy programs which operate on names as | |
5876 | * they're returned by readdir. Until we re-use freed offsets | |
5877 | * we have this hack to stop new entries from being returned | |
5878 | * under the assumption that they'll never reach this huge | |
5879 | * offset. | |
5880 | * | |
5881 | * This is being careful not to overflow 32bit loff_t unless the | |
5882 | * last entry requires it because doing so has broken 32bit apps | |
5883 | * in the past. | |
5884 | */ | |
5885 | if (key_type == BTRFS_DIR_INDEX_KEY) { | |
5886 | if (ctx->pos >= INT_MAX) | |
5887 | ctx->pos = LLONG_MAX; | |
5888 | else | |
5889 | ctx->pos = INT_MAX; | |
5890 | } | |
39279cc3 CM |
5891 | nopos: |
5892 | ret = 0; | |
5893 | err: | |
16cdcec7 MX |
5894 | if (key_type == BTRFS_DIR_INDEX_KEY) |
5895 | btrfs_put_delayed_items(&ins_list, &del_list); | |
39279cc3 | 5896 | btrfs_free_path(path); |
39279cc3 CM |
5897 | return ret; |
5898 | } | |
5899 | ||
a9185b41 | 5900 | int btrfs_write_inode(struct inode *inode, struct writeback_control *wbc) |
39279cc3 CM |
5901 | { |
5902 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
5903 | struct btrfs_trans_handle *trans; | |
5904 | int ret = 0; | |
0af3d00b | 5905 | bool nolock = false; |
39279cc3 | 5906 | |
72ac3c0d | 5907 | if (test_bit(BTRFS_INODE_DUMMY, &BTRFS_I(inode)->runtime_flags)) |
4ca8b41e CM |
5908 | return 0; |
5909 | ||
83eea1f1 | 5910 | if (btrfs_fs_closing(root->fs_info) && btrfs_is_free_space_inode(inode)) |
82d5902d | 5911 | nolock = true; |
0af3d00b | 5912 | |
a9185b41 | 5913 | if (wbc->sync_mode == WB_SYNC_ALL) { |
0af3d00b | 5914 | if (nolock) |
7a7eaa40 | 5915 | trans = btrfs_join_transaction_nolock(root); |
0af3d00b | 5916 | else |
7a7eaa40 | 5917 | trans = btrfs_join_transaction(root); |
3612b495 TI |
5918 | if (IS_ERR(trans)) |
5919 | return PTR_ERR(trans); | |
a698d075 | 5920 | ret = btrfs_commit_transaction(trans, root); |
39279cc3 CM |
5921 | } |
5922 | return ret; | |
5923 | } | |
5924 | ||
5925 | /* | |
54aa1f4d | 5926 | * This is somewhat expensive, updating the tree every time the |
39279cc3 CM |
5927 | * inode changes. But, it is most likely to find the inode in cache. |
5928 | * FIXME, needs more benchmarking...there are no reasons other than performance | |
5929 | * to keep or drop this code. | |
5930 | */ | |
48a3b636 | 5931 | static int btrfs_dirty_inode(struct inode *inode) |
39279cc3 CM |
5932 | { |
5933 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
5934 | struct btrfs_trans_handle *trans; | |
8929ecfa YZ |
5935 | int ret; |
5936 | ||
72ac3c0d | 5937 | if (test_bit(BTRFS_INODE_DUMMY, &BTRFS_I(inode)->runtime_flags)) |
22c44fe6 | 5938 | return 0; |
39279cc3 | 5939 | |
7a7eaa40 | 5940 | trans = btrfs_join_transaction(root); |
22c44fe6 JB |
5941 | if (IS_ERR(trans)) |
5942 | return PTR_ERR(trans); | |
8929ecfa YZ |
5943 | |
5944 | ret = btrfs_update_inode(trans, root, inode); | |
94b60442 CM |
5945 | if (ret && ret == -ENOSPC) { |
5946 | /* whoops, lets try again with the full transaction */ | |
5947 | btrfs_end_transaction(trans, root); | |
5948 | trans = btrfs_start_transaction(root, 1); | |
22c44fe6 JB |
5949 | if (IS_ERR(trans)) |
5950 | return PTR_ERR(trans); | |
8929ecfa | 5951 | |
94b60442 | 5952 | ret = btrfs_update_inode(trans, root, inode); |
94b60442 | 5953 | } |
39279cc3 | 5954 | btrfs_end_transaction(trans, root); |
16cdcec7 MX |
5955 | if (BTRFS_I(inode)->delayed_node) |
5956 | btrfs_balance_delayed_items(root); | |
22c44fe6 JB |
5957 | |
5958 | return ret; | |
5959 | } | |
5960 | ||
5961 | /* | |
5962 | * This is a copy of file_update_time. We need this so we can return error on | |
5963 | * ENOSPC for updating the inode in the case of file write and mmap writes. | |
5964 | */ | |
e41f941a JB |
5965 | static int btrfs_update_time(struct inode *inode, struct timespec *now, |
5966 | int flags) | |
22c44fe6 | 5967 | { |
2bc55652 AB |
5968 | struct btrfs_root *root = BTRFS_I(inode)->root; |
5969 | ||
5970 | if (btrfs_root_readonly(root)) | |
5971 | return -EROFS; | |
5972 | ||
e41f941a | 5973 | if (flags & S_VERSION) |
22c44fe6 | 5974 | inode_inc_iversion(inode); |
e41f941a JB |
5975 | if (flags & S_CTIME) |
5976 | inode->i_ctime = *now; | |
5977 | if (flags & S_MTIME) | |
5978 | inode->i_mtime = *now; | |
5979 | if (flags & S_ATIME) | |
5980 | inode->i_atime = *now; | |
5981 | return btrfs_dirty_inode(inode); | |
39279cc3 CM |
5982 | } |
5983 | ||
d352ac68 CM |
5984 | /* |
5985 | * find the highest existing sequence number in a directory | |
5986 | * and then set the in-memory index_cnt variable to reflect | |
5987 | * free sequence numbers | |
5988 | */ | |
aec7477b JB |
5989 | static int btrfs_set_inode_index_count(struct inode *inode) |
5990 | { | |
5991 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
5992 | struct btrfs_key key, found_key; | |
5993 | struct btrfs_path *path; | |
5994 | struct extent_buffer *leaf; | |
5995 | int ret; | |
5996 | ||
33345d01 | 5997 | key.objectid = btrfs_ino(inode); |
962a298f | 5998 | key.type = BTRFS_DIR_INDEX_KEY; |
aec7477b JB |
5999 | key.offset = (u64)-1; |
6000 | ||
6001 | path = btrfs_alloc_path(); | |
6002 | if (!path) | |
6003 | return -ENOMEM; | |
6004 | ||
6005 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); | |
6006 | if (ret < 0) | |
6007 | goto out; | |
6008 | /* FIXME: we should be able to handle this */ | |
6009 | if (ret == 0) | |
6010 | goto out; | |
6011 | ret = 0; | |
6012 | ||
6013 | /* | |
6014 | * MAGIC NUMBER EXPLANATION: | |
6015 | * since we search a directory based on f_pos we have to start at 2 | |
6016 | * since '.' and '..' have f_pos of 0 and 1 respectively, so everybody | |
6017 | * else has to start at 2 | |
6018 | */ | |
6019 | if (path->slots[0] == 0) { | |
6020 | BTRFS_I(inode)->index_cnt = 2; | |
6021 | goto out; | |
6022 | } | |
6023 | ||
6024 | path->slots[0]--; | |
6025 | ||
6026 | leaf = path->nodes[0]; | |
6027 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); | |
6028 | ||
33345d01 | 6029 | if (found_key.objectid != btrfs_ino(inode) || |
962a298f | 6030 | found_key.type != BTRFS_DIR_INDEX_KEY) { |
aec7477b JB |
6031 | BTRFS_I(inode)->index_cnt = 2; |
6032 | goto out; | |
6033 | } | |
6034 | ||
6035 | BTRFS_I(inode)->index_cnt = found_key.offset + 1; | |
6036 | out: | |
6037 | btrfs_free_path(path); | |
6038 | return ret; | |
6039 | } | |
6040 | ||
d352ac68 CM |
6041 | /* |
6042 | * helper to find a free sequence number in a given directory. This current | |
6043 | * code is very simple, later versions will do smarter things in the btree | |
6044 | */ | |
3de4586c | 6045 | int btrfs_set_inode_index(struct inode *dir, u64 *index) |
aec7477b JB |
6046 | { |
6047 | int ret = 0; | |
6048 | ||
6049 | if (BTRFS_I(dir)->index_cnt == (u64)-1) { | |
16cdcec7 MX |
6050 | ret = btrfs_inode_delayed_dir_index_count(dir); |
6051 | if (ret) { | |
6052 | ret = btrfs_set_inode_index_count(dir); | |
6053 | if (ret) | |
6054 | return ret; | |
6055 | } | |
aec7477b JB |
6056 | } |
6057 | ||
00e4e6b3 | 6058 | *index = BTRFS_I(dir)->index_cnt; |
aec7477b JB |
6059 | BTRFS_I(dir)->index_cnt++; |
6060 | ||
6061 | return ret; | |
6062 | } | |
6063 | ||
b0d5d10f CM |
6064 | static int btrfs_insert_inode_locked(struct inode *inode) |
6065 | { | |
6066 | struct btrfs_iget_args args; | |
6067 | args.location = &BTRFS_I(inode)->location; | |
6068 | args.root = BTRFS_I(inode)->root; | |
6069 | ||
6070 | return insert_inode_locked4(inode, | |
6071 | btrfs_inode_hash(inode->i_ino, BTRFS_I(inode)->root), | |
6072 | btrfs_find_actor, &args); | |
6073 | } | |
6074 | ||
39279cc3 CM |
6075 | static struct inode *btrfs_new_inode(struct btrfs_trans_handle *trans, |
6076 | struct btrfs_root *root, | |
aec7477b | 6077 | struct inode *dir, |
9c58309d | 6078 | const char *name, int name_len, |
175a4eb7 AV |
6079 | u64 ref_objectid, u64 objectid, |
6080 | umode_t mode, u64 *index) | |
39279cc3 CM |
6081 | { |
6082 | struct inode *inode; | |
5f39d397 | 6083 | struct btrfs_inode_item *inode_item; |
39279cc3 | 6084 | struct btrfs_key *location; |
5f39d397 | 6085 | struct btrfs_path *path; |
9c58309d CM |
6086 | struct btrfs_inode_ref *ref; |
6087 | struct btrfs_key key[2]; | |
6088 | u32 sizes[2]; | |
ef3b9af5 | 6089 | int nitems = name ? 2 : 1; |
9c58309d | 6090 | unsigned long ptr; |
39279cc3 | 6091 | int ret; |
39279cc3 | 6092 | |
5f39d397 | 6093 | path = btrfs_alloc_path(); |
d8926bb3 MF |
6094 | if (!path) |
6095 | return ERR_PTR(-ENOMEM); | |
5f39d397 | 6096 | |
39279cc3 | 6097 | inode = new_inode(root->fs_info->sb); |
8fb27640 YS |
6098 | if (!inode) { |
6099 | btrfs_free_path(path); | |
39279cc3 | 6100 | return ERR_PTR(-ENOMEM); |
8fb27640 | 6101 | } |
39279cc3 | 6102 | |
5762b5c9 FM |
6103 | /* |
6104 | * O_TMPFILE, set link count to 0, so that after this point, | |
6105 | * we fill in an inode item with the correct link count. | |
6106 | */ | |
6107 | if (!name) | |
6108 | set_nlink(inode, 0); | |
6109 | ||
581bb050 LZ |
6110 | /* |
6111 | * we have to initialize this early, so we can reclaim the inode | |
6112 | * number if we fail afterwards in this function. | |
6113 | */ | |
6114 | inode->i_ino = objectid; | |
6115 | ||
ef3b9af5 | 6116 | if (dir && name) { |
1abe9b8a | 6117 | trace_btrfs_inode_request(dir); |
6118 | ||
3de4586c | 6119 | ret = btrfs_set_inode_index(dir, index); |
09771430 | 6120 | if (ret) { |
8fb27640 | 6121 | btrfs_free_path(path); |
09771430 | 6122 | iput(inode); |
aec7477b | 6123 | return ERR_PTR(ret); |
09771430 | 6124 | } |
ef3b9af5 FM |
6125 | } else if (dir) { |
6126 | *index = 0; | |
aec7477b JB |
6127 | } |
6128 | /* | |
6129 | * index_cnt is ignored for everything but a dir, | |
6130 | * btrfs_get_inode_index_count has an explanation for the magic | |
6131 | * number | |
6132 | */ | |
6133 | BTRFS_I(inode)->index_cnt = 2; | |
67de1176 | 6134 | BTRFS_I(inode)->dir_index = *index; |
39279cc3 | 6135 | BTRFS_I(inode)->root = root; |
e02119d5 | 6136 | BTRFS_I(inode)->generation = trans->transid; |
76195853 | 6137 | inode->i_generation = BTRFS_I(inode)->generation; |
b888db2b | 6138 | |
5dc562c5 JB |
6139 | /* |
6140 | * We could have gotten an inode number from somebody who was fsynced | |
6141 | * and then removed in this same transaction, so let's just set full | |
6142 | * sync since it will be a full sync anyway and this will blow away the | |
6143 | * old info in the log. | |
6144 | */ | |
6145 | set_bit(BTRFS_INODE_NEEDS_FULL_SYNC, &BTRFS_I(inode)->runtime_flags); | |
6146 | ||
9c58309d | 6147 | key[0].objectid = objectid; |
962a298f | 6148 | key[0].type = BTRFS_INODE_ITEM_KEY; |
9c58309d CM |
6149 | key[0].offset = 0; |
6150 | ||
9c58309d | 6151 | sizes[0] = sizeof(struct btrfs_inode_item); |
ef3b9af5 FM |
6152 | |
6153 | if (name) { | |
6154 | /* | |
6155 | * Start new inodes with an inode_ref. This is slightly more | |
6156 | * efficient for small numbers of hard links since they will | |
6157 | * be packed into one item. Extended refs will kick in if we | |
6158 | * add more hard links than can fit in the ref item. | |
6159 | */ | |
6160 | key[1].objectid = objectid; | |
962a298f | 6161 | key[1].type = BTRFS_INODE_REF_KEY; |
ef3b9af5 FM |
6162 | key[1].offset = ref_objectid; |
6163 | ||
6164 | sizes[1] = name_len + sizeof(*ref); | |
6165 | } | |
9c58309d | 6166 | |
b0d5d10f CM |
6167 | location = &BTRFS_I(inode)->location; |
6168 | location->objectid = objectid; | |
6169 | location->offset = 0; | |
962a298f | 6170 | location->type = BTRFS_INODE_ITEM_KEY; |
b0d5d10f CM |
6171 | |
6172 | ret = btrfs_insert_inode_locked(inode); | |
6173 | if (ret < 0) | |
6174 | goto fail; | |
6175 | ||
b9473439 | 6176 | path->leave_spinning = 1; |
ef3b9af5 | 6177 | ret = btrfs_insert_empty_items(trans, root, path, key, sizes, nitems); |
9c58309d | 6178 | if (ret != 0) |
b0d5d10f | 6179 | goto fail_unlock; |
5f39d397 | 6180 | |
ecc11fab | 6181 | inode_init_owner(inode, dir, mode); |
a76a3cd4 | 6182 | inode_set_bytes(inode, 0); |
9cc97d64 | 6183 | |
6184 | inode->i_mtime = CURRENT_TIME; | |
6185 | inode->i_atime = inode->i_mtime; | |
6186 | inode->i_ctime = inode->i_mtime; | |
6187 | BTRFS_I(inode)->i_otime = inode->i_mtime; | |
6188 | ||
5f39d397 CM |
6189 | inode_item = btrfs_item_ptr(path->nodes[0], path->slots[0], |
6190 | struct btrfs_inode_item); | |
293f7e07 LZ |
6191 | memset_extent_buffer(path->nodes[0], 0, (unsigned long)inode_item, |
6192 | sizeof(*inode_item)); | |
e02119d5 | 6193 | fill_inode_item(trans, path->nodes[0], inode_item, inode); |
9c58309d | 6194 | |
ef3b9af5 FM |
6195 | if (name) { |
6196 | ref = btrfs_item_ptr(path->nodes[0], path->slots[0] + 1, | |
6197 | struct btrfs_inode_ref); | |
6198 | btrfs_set_inode_ref_name_len(path->nodes[0], ref, name_len); | |
6199 | btrfs_set_inode_ref_index(path->nodes[0], ref, *index); | |
6200 | ptr = (unsigned long)(ref + 1); | |
6201 | write_extent_buffer(path->nodes[0], name, ptr, name_len); | |
6202 | } | |
9c58309d | 6203 | |
5f39d397 CM |
6204 | btrfs_mark_buffer_dirty(path->nodes[0]); |
6205 | btrfs_free_path(path); | |
6206 | ||
6cbff00f CH |
6207 | btrfs_inherit_iflags(inode, dir); |
6208 | ||
569254b0 | 6209 | if (S_ISREG(mode)) { |
94272164 CM |
6210 | if (btrfs_test_opt(root, NODATASUM)) |
6211 | BTRFS_I(inode)->flags |= BTRFS_INODE_NODATASUM; | |
213490b3 | 6212 | if (btrfs_test_opt(root, NODATACOW)) |
f2bdf9a8 JB |
6213 | BTRFS_I(inode)->flags |= BTRFS_INODE_NODATACOW | |
6214 | BTRFS_INODE_NODATASUM; | |
94272164 CM |
6215 | } |
6216 | ||
5d4f98a2 | 6217 | inode_tree_add(inode); |
1abe9b8a | 6218 | |
6219 | trace_btrfs_inode_new(inode); | |
1973f0fa | 6220 | btrfs_set_inode_last_trans(trans, inode); |
1abe9b8a | 6221 | |
8ea05e3a AB |
6222 | btrfs_update_root_times(trans, root); |
6223 | ||
63541927 FDBM |
6224 | ret = btrfs_inode_inherit_props(trans, inode, dir); |
6225 | if (ret) | |
6226 | btrfs_err(root->fs_info, | |
6227 | "error inheriting props for ino %llu (root %llu): %d", | |
6228 | btrfs_ino(inode), root->root_key.objectid, ret); | |
6229 | ||
39279cc3 | 6230 | return inode; |
b0d5d10f CM |
6231 | |
6232 | fail_unlock: | |
6233 | unlock_new_inode(inode); | |
5f39d397 | 6234 | fail: |
ef3b9af5 | 6235 | if (dir && name) |
aec7477b | 6236 | BTRFS_I(dir)->index_cnt--; |
5f39d397 | 6237 | btrfs_free_path(path); |
09771430 | 6238 | iput(inode); |
5f39d397 | 6239 | return ERR_PTR(ret); |
39279cc3 CM |
6240 | } |
6241 | ||
6242 | static inline u8 btrfs_inode_type(struct inode *inode) | |
6243 | { | |
6244 | return btrfs_type_by_mode[(inode->i_mode & S_IFMT) >> S_SHIFT]; | |
6245 | } | |
6246 | ||
d352ac68 CM |
6247 | /* |
6248 | * utility function to add 'inode' into 'parent_inode' with | |
6249 | * a give name and a given sequence number. | |
6250 | * if 'add_backref' is true, also insert a backref from the | |
6251 | * inode to the parent directory. | |
6252 | */ | |
e02119d5 CM |
6253 | int btrfs_add_link(struct btrfs_trans_handle *trans, |
6254 | struct inode *parent_inode, struct inode *inode, | |
6255 | const char *name, int name_len, int add_backref, u64 index) | |
39279cc3 | 6256 | { |
4df27c4d | 6257 | int ret = 0; |
39279cc3 | 6258 | struct btrfs_key key; |
e02119d5 | 6259 | struct btrfs_root *root = BTRFS_I(parent_inode)->root; |
33345d01 LZ |
6260 | u64 ino = btrfs_ino(inode); |
6261 | u64 parent_ino = btrfs_ino(parent_inode); | |
5f39d397 | 6262 | |
33345d01 | 6263 | if (unlikely(ino == BTRFS_FIRST_FREE_OBJECTID)) { |
4df27c4d YZ |
6264 | memcpy(&key, &BTRFS_I(inode)->root->root_key, sizeof(key)); |
6265 | } else { | |
33345d01 | 6266 | key.objectid = ino; |
962a298f | 6267 | key.type = BTRFS_INODE_ITEM_KEY; |
4df27c4d YZ |
6268 | key.offset = 0; |
6269 | } | |
6270 | ||
33345d01 | 6271 | if (unlikely(ino == BTRFS_FIRST_FREE_OBJECTID)) { |
4df27c4d YZ |
6272 | ret = btrfs_add_root_ref(trans, root->fs_info->tree_root, |
6273 | key.objectid, root->root_key.objectid, | |
33345d01 | 6274 | parent_ino, index, name, name_len); |
4df27c4d | 6275 | } else if (add_backref) { |
33345d01 LZ |
6276 | ret = btrfs_insert_inode_ref(trans, root, name, name_len, ino, |
6277 | parent_ino, index); | |
4df27c4d | 6278 | } |
39279cc3 | 6279 | |
79787eaa JM |
6280 | /* Nothing to clean up yet */ |
6281 | if (ret) | |
6282 | return ret; | |
4df27c4d | 6283 | |
79787eaa JM |
6284 | ret = btrfs_insert_dir_item(trans, root, name, name_len, |
6285 | parent_inode, &key, | |
6286 | btrfs_inode_type(inode), index); | |
9c52057c | 6287 | if (ret == -EEXIST || ret == -EOVERFLOW) |
79787eaa JM |
6288 | goto fail_dir_item; |
6289 | else if (ret) { | |
6290 | btrfs_abort_transaction(trans, root, ret); | |
6291 | return ret; | |
39279cc3 | 6292 | } |
79787eaa JM |
6293 | |
6294 | btrfs_i_size_write(parent_inode, parent_inode->i_size + | |
6295 | name_len * 2); | |
0c4d2d95 | 6296 | inode_inc_iversion(parent_inode); |
79787eaa JM |
6297 | parent_inode->i_mtime = parent_inode->i_ctime = CURRENT_TIME; |
6298 | ret = btrfs_update_inode(trans, root, parent_inode); | |
6299 | if (ret) | |
6300 | btrfs_abort_transaction(trans, root, ret); | |
39279cc3 | 6301 | return ret; |
fe66a05a CM |
6302 | |
6303 | fail_dir_item: | |
6304 | if (unlikely(ino == BTRFS_FIRST_FREE_OBJECTID)) { | |
6305 | u64 local_index; | |
6306 | int err; | |
6307 | err = btrfs_del_root_ref(trans, root->fs_info->tree_root, | |
6308 | key.objectid, root->root_key.objectid, | |
6309 | parent_ino, &local_index, name, name_len); | |
6310 | ||
6311 | } else if (add_backref) { | |
6312 | u64 local_index; | |
6313 | int err; | |
6314 | ||
6315 | err = btrfs_del_inode_ref(trans, root, name, name_len, | |
6316 | ino, parent_ino, &local_index); | |
6317 | } | |
6318 | return ret; | |
39279cc3 CM |
6319 | } |
6320 | ||
6321 | static int btrfs_add_nondir(struct btrfs_trans_handle *trans, | |
a1b075d2 JB |
6322 | struct inode *dir, struct dentry *dentry, |
6323 | struct inode *inode, int backref, u64 index) | |
39279cc3 | 6324 | { |
a1b075d2 JB |
6325 | int err = btrfs_add_link(trans, dir, inode, |
6326 | dentry->d_name.name, dentry->d_name.len, | |
6327 | backref, index); | |
39279cc3 CM |
6328 | if (err > 0) |
6329 | err = -EEXIST; | |
6330 | return err; | |
6331 | } | |
6332 | ||
618e21d5 | 6333 | static int btrfs_mknod(struct inode *dir, struct dentry *dentry, |
1a67aafb | 6334 | umode_t mode, dev_t rdev) |
618e21d5 JB |
6335 | { |
6336 | struct btrfs_trans_handle *trans; | |
6337 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
1832a6d5 | 6338 | struct inode *inode = NULL; |
618e21d5 JB |
6339 | int err; |
6340 | int drop_inode = 0; | |
6341 | u64 objectid; | |
00e4e6b3 | 6342 | u64 index = 0; |
618e21d5 | 6343 | |
9ed74f2d JB |
6344 | /* |
6345 | * 2 for inode item and ref | |
6346 | * 2 for dir items | |
6347 | * 1 for xattr if selinux is on | |
6348 | */ | |
a22285a6 YZ |
6349 | trans = btrfs_start_transaction(root, 5); |
6350 | if (IS_ERR(trans)) | |
6351 | return PTR_ERR(trans); | |
1832a6d5 | 6352 | |
581bb050 LZ |
6353 | err = btrfs_find_free_ino(root, &objectid); |
6354 | if (err) | |
6355 | goto out_unlock; | |
6356 | ||
aec7477b | 6357 | inode = btrfs_new_inode(trans, root, dir, dentry->d_name.name, |
33345d01 | 6358 | dentry->d_name.len, btrfs_ino(dir), objectid, |
d82a6f1d | 6359 | mode, &index); |
7cf96da3 TI |
6360 | if (IS_ERR(inode)) { |
6361 | err = PTR_ERR(inode); | |
618e21d5 | 6362 | goto out_unlock; |
7cf96da3 | 6363 | } |
618e21d5 | 6364 | |
ad19db71 CS |
6365 | /* |
6366 | * If the active LSM wants to access the inode during | |
6367 | * d_instantiate it needs these. Smack checks to see | |
6368 | * if the filesystem supports xattrs by looking at the | |
6369 | * ops vector. | |
6370 | */ | |
ad19db71 | 6371 | inode->i_op = &btrfs_special_inode_operations; |
b0d5d10f CM |
6372 | init_special_inode(inode, inode->i_mode, rdev); |
6373 | ||
6374 | err = btrfs_init_inode_security(trans, inode, dir, &dentry->d_name); | |
618e21d5 | 6375 | if (err) |
b0d5d10f CM |
6376 | goto out_unlock_inode; |
6377 | ||
6378 | err = btrfs_add_nondir(trans, dir, dentry, inode, 0, index); | |
6379 | if (err) { | |
6380 | goto out_unlock_inode; | |
6381 | } else { | |
1b4ab1bb | 6382 | btrfs_update_inode(trans, root, inode); |
b0d5d10f | 6383 | unlock_new_inode(inode); |
08c422c2 | 6384 | d_instantiate(dentry, inode); |
618e21d5 | 6385 | } |
b0d5d10f | 6386 | |
618e21d5 | 6387 | out_unlock: |
7ad85bb7 | 6388 | btrfs_end_transaction(trans, root); |
c581afc8 | 6389 | btrfs_balance_delayed_items(root); |
b53d3f5d | 6390 | btrfs_btree_balance_dirty(root); |
618e21d5 JB |
6391 | if (drop_inode) { |
6392 | inode_dec_link_count(inode); | |
6393 | iput(inode); | |
6394 | } | |
618e21d5 | 6395 | return err; |
b0d5d10f CM |
6396 | |
6397 | out_unlock_inode: | |
6398 | drop_inode = 1; | |
6399 | unlock_new_inode(inode); | |
6400 | goto out_unlock; | |
6401 | ||
618e21d5 JB |
6402 | } |
6403 | ||
39279cc3 | 6404 | static int btrfs_create(struct inode *dir, struct dentry *dentry, |
ebfc3b49 | 6405 | umode_t mode, bool excl) |
39279cc3 CM |
6406 | { |
6407 | struct btrfs_trans_handle *trans; | |
6408 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
1832a6d5 | 6409 | struct inode *inode = NULL; |
43baa579 | 6410 | int drop_inode_on_err = 0; |
a22285a6 | 6411 | int err; |
39279cc3 | 6412 | u64 objectid; |
00e4e6b3 | 6413 | u64 index = 0; |
39279cc3 | 6414 | |
9ed74f2d JB |
6415 | /* |
6416 | * 2 for inode item and ref | |
6417 | * 2 for dir items | |
6418 | * 1 for xattr if selinux is on | |
6419 | */ | |
a22285a6 YZ |
6420 | trans = btrfs_start_transaction(root, 5); |
6421 | if (IS_ERR(trans)) | |
6422 | return PTR_ERR(trans); | |
9ed74f2d | 6423 | |
581bb050 LZ |
6424 | err = btrfs_find_free_ino(root, &objectid); |
6425 | if (err) | |
6426 | goto out_unlock; | |
6427 | ||
aec7477b | 6428 | inode = btrfs_new_inode(trans, root, dir, dentry->d_name.name, |
33345d01 | 6429 | dentry->d_name.len, btrfs_ino(dir), objectid, |
d82a6f1d | 6430 | mode, &index); |
7cf96da3 TI |
6431 | if (IS_ERR(inode)) { |
6432 | err = PTR_ERR(inode); | |
39279cc3 | 6433 | goto out_unlock; |
7cf96da3 | 6434 | } |
43baa579 | 6435 | drop_inode_on_err = 1; |
ad19db71 CS |
6436 | /* |
6437 | * If the active LSM wants to access the inode during | |
6438 | * d_instantiate it needs these. Smack checks to see | |
6439 | * if the filesystem supports xattrs by looking at the | |
6440 | * ops vector. | |
6441 | */ | |
6442 | inode->i_fop = &btrfs_file_operations; | |
6443 | inode->i_op = &btrfs_file_inode_operations; | |
b0d5d10f | 6444 | inode->i_mapping->a_ops = &btrfs_aops; |
b0d5d10f CM |
6445 | |
6446 | err = btrfs_init_inode_security(trans, inode, dir, &dentry->d_name); | |
6447 | if (err) | |
6448 | goto out_unlock_inode; | |
6449 | ||
6450 | err = btrfs_update_inode(trans, root, inode); | |
6451 | if (err) | |
6452 | goto out_unlock_inode; | |
ad19db71 | 6453 | |
a1b075d2 | 6454 | err = btrfs_add_nondir(trans, dir, dentry, inode, 0, index); |
39279cc3 | 6455 | if (err) |
b0d5d10f | 6456 | goto out_unlock_inode; |
43baa579 | 6457 | |
43baa579 | 6458 | BTRFS_I(inode)->io_tree.ops = &btrfs_extent_io_ops; |
b0d5d10f | 6459 | unlock_new_inode(inode); |
43baa579 FB |
6460 | d_instantiate(dentry, inode); |
6461 | ||
39279cc3 | 6462 | out_unlock: |
7ad85bb7 | 6463 | btrfs_end_transaction(trans, root); |
43baa579 | 6464 | if (err && drop_inode_on_err) { |
39279cc3 CM |
6465 | inode_dec_link_count(inode); |
6466 | iput(inode); | |
6467 | } | |
c581afc8 | 6468 | btrfs_balance_delayed_items(root); |
b53d3f5d | 6469 | btrfs_btree_balance_dirty(root); |
39279cc3 | 6470 | return err; |
b0d5d10f CM |
6471 | |
6472 | out_unlock_inode: | |
6473 | unlock_new_inode(inode); | |
6474 | goto out_unlock; | |
6475 | ||
39279cc3 CM |
6476 | } |
6477 | ||
6478 | static int btrfs_link(struct dentry *old_dentry, struct inode *dir, | |
6479 | struct dentry *dentry) | |
6480 | { | |
271dba45 | 6481 | struct btrfs_trans_handle *trans = NULL; |
39279cc3 | 6482 | struct btrfs_root *root = BTRFS_I(dir)->root; |
2b0143b5 | 6483 | struct inode *inode = d_inode(old_dentry); |
00e4e6b3 | 6484 | u64 index; |
39279cc3 CM |
6485 | int err; |
6486 | int drop_inode = 0; | |
6487 | ||
4a8be425 TH |
6488 | /* do not allow sys_link's with other subvols of the same device */ |
6489 | if (root->objectid != BTRFS_I(inode)->root->objectid) | |
3ab3564f | 6490 | return -EXDEV; |
4a8be425 | 6491 | |
f186373f | 6492 | if (inode->i_nlink >= BTRFS_LINK_MAX) |
c055e99e | 6493 | return -EMLINK; |
4a8be425 | 6494 | |
3de4586c | 6495 | err = btrfs_set_inode_index(dir, &index); |
aec7477b JB |
6496 | if (err) |
6497 | goto fail; | |
6498 | ||
a22285a6 | 6499 | /* |
7e6b6465 | 6500 | * 2 items for inode and inode ref |
a22285a6 | 6501 | * 2 items for dir items |
7e6b6465 | 6502 | * 1 item for parent inode |
a22285a6 | 6503 | */ |
7e6b6465 | 6504 | trans = btrfs_start_transaction(root, 5); |
a22285a6 YZ |
6505 | if (IS_ERR(trans)) { |
6506 | err = PTR_ERR(trans); | |
271dba45 | 6507 | trans = NULL; |
a22285a6 YZ |
6508 | goto fail; |
6509 | } | |
5f39d397 | 6510 | |
67de1176 MX |
6511 | /* There are several dir indexes for this inode, clear the cache. */ |
6512 | BTRFS_I(inode)->dir_index = 0ULL; | |
8b558c5f | 6513 | inc_nlink(inode); |
0c4d2d95 | 6514 | inode_inc_iversion(inode); |
3153495d | 6515 | inode->i_ctime = CURRENT_TIME; |
7de9c6ee | 6516 | ihold(inode); |
e9976151 | 6517 | set_bit(BTRFS_INODE_COPY_EVERYTHING, &BTRFS_I(inode)->runtime_flags); |
aec7477b | 6518 | |
a1b075d2 | 6519 | err = btrfs_add_nondir(trans, dir, dentry, inode, 1, index); |
5f39d397 | 6520 | |
a5719521 | 6521 | if (err) { |
54aa1f4d | 6522 | drop_inode = 1; |
a5719521 | 6523 | } else { |
10d9f309 | 6524 | struct dentry *parent = dentry->d_parent; |
a5719521 | 6525 | err = btrfs_update_inode(trans, root, inode); |
79787eaa JM |
6526 | if (err) |
6527 | goto fail; | |
ef3b9af5 FM |
6528 | if (inode->i_nlink == 1) { |
6529 | /* | |
6530 | * If new hard link count is 1, it's a file created | |
6531 | * with open(2) O_TMPFILE flag. | |
6532 | */ | |
6533 | err = btrfs_orphan_del(trans, inode); | |
6534 | if (err) | |
6535 | goto fail; | |
6536 | } | |
08c422c2 | 6537 | d_instantiate(dentry, inode); |
6a912213 | 6538 | btrfs_log_new_name(trans, inode, NULL, parent); |
a5719521 | 6539 | } |
39279cc3 | 6540 | |
c581afc8 | 6541 | btrfs_balance_delayed_items(root); |
1832a6d5 | 6542 | fail: |
271dba45 FM |
6543 | if (trans) |
6544 | btrfs_end_transaction(trans, root); | |
39279cc3 CM |
6545 | if (drop_inode) { |
6546 | inode_dec_link_count(inode); | |
6547 | iput(inode); | |
6548 | } | |
b53d3f5d | 6549 | btrfs_btree_balance_dirty(root); |
39279cc3 CM |
6550 | return err; |
6551 | } | |
6552 | ||
18bb1db3 | 6553 | static int btrfs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) |
39279cc3 | 6554 | { |
b9d86667 | 6555 | struct inode *inode = NULL; |
39279cc3 CM |
6556 | struct btrfs_trans_handle *trans; |
6557 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
6558 | int err = 0; | |
6559 | int drop_on_err = 0; | |
b9d86667 | 6560 | u64 objectid = 0; |
00e4e6b3 | 6561 | u64 index = 0; |
39279cc3 | 6562 | |
9ed74f2d JB |
6563 | /* |
6564 | * 2 items for inode and ref | |
6565 | * 2 items for dir items | |
6566 | * 1 for xattr if selinux is on | |
6567 | */ | |
a22285a6 YZ |
6568 | trans = btrfs_start_transaction(root, 5); |
6569 | if (IS_ERR(trans)) | |
6570 | return PTR_ERR(trans); | |
39279cc3 | 6571 | |
581bb050 LZ |
6572 | err = btrfs_find_free_ino(root, &objectid); |
6573 | if (err) | |
6574 | goto out_fail; | |
6575 | ||
aec7477b | 6576 | inode = btrfs_new_inode(trans, root, dir, dentry->d_name.name, |
33345d01 | 6577 | dentry->d_name.len, btrfs_ino(dir), objectid, |
d82a6f1d | 6578 | S_IFDIR | mode, &index); |
39279cc3 CM |
6579 | if (IS_ERR(inode)) { |
6580 | err = PTR_ERR(inode); | |
6581 | goto out_fail; | |
6582 | } | |
5f39d397 | 6583 | |
39279cc3 | 6584 | drop_on_err = 1; |
b0d5d10f CM |
6585 | /* these must be set before we unlock the inode */ |
6586 | inode->i_op = &btrfs_dir_inode_operations; | |
6587 | inode->i_fop = &btrfs_dir_file_operations; | |
33268eaf | 6588 | |
2a7dba39 | 6589 | err = btrfs_init_inode_security(trans, inode, dir, &dentry->d_name); |
33268eaf | 6590 | if (err) |
b0d5d10f | 6591 | goto out_fail_inode; |
39279cc3 | 6592 | |
dbe674a9 | 6593 | btrfs_i_size_write(inode, 0); |
39279cc3 CM |
6594 | err = btrfs_update_inode(trans, root, inode); |
6595 | if (err) | |
b0d5d10f | 6596 | goto out_fail_inode; |
5f39d397 | 6597 | |
a1b075d2 JB |
6598 | err = btrfs_add_link(trans, dir, inode, dentry->d_name.name, |
6599 | dentry->d_name.len, 0, index); | |
39279cc3 | 6600 | if (err) |
b0d5d10f | 6601 | goto out_fail_inode; |
5f39d397 | 6602 | |
39279cc3 | 6603 | d_instantiate(dentry, inode); |
b0d5d10f CM |
6604 | /* |
6605 | * mkdir is special. We're unlocking after we call d_instantiate | |
6606 | * to avoid a race with nfsd calling d_instantiate. | |
6607 | */ | |
6608 | unlock_new_inode(inode); | |
39279cc3 | 6609 | drop_on_err = 0; |
39279cc3 CM |
6610 | |
6611 | out_fail: | |
7ad85bb7 | 6612 | btrfs_end_transaction(trans, root); |
c7cfb8a5 WS |
6613 | if (drop_on_err) { |
6614 | inode_dec_link_count(inode); | |
39279cc3 | 6615 | iput(inode); |
c7cfb8a5 | 6616 | } |
c581afc8 | 6617 | btrfs_balance_delayed_items(root); |
b53d3f5d | 6618 | btrfs_btree_balance_dirty(root); |
39279cc3 | 6619 | return err; |
b0d5d10f CM |
6620 | |
6621 | out_fail_inode: | |
6622 | unlock_new_inode(inode); | |
6623 | goto out_fail; | |
39279cc3 CM |
6624 | } |
6625 | ||
e6c4efd8 QW |
6626 | /* Find next extent map of a given extent map, caller needs to ensure locks */ |
6627 | static struct extent_map *next_extent_map(struct extent_map *em) | |
6628 | { | |
6629 | struct rb_node *next; | |
6630 | ||
6631 | next = rb_next(&em->rb_node); | |
6632 | if (!next) | |
6633 | return NULL; | |
6634 | return container_of(next, struct extent_map, rb_node); | |
6635 | } | |
6636 | ||
6637 | static struct extent_map *prev_extent_map(struct extent_map *em) | |
6638 | { | |
6639 | struct rb_node *prev; | |
6640 | ||
6641 | prev = rb_prev(&em->rb_node); | |
6642 | if (!prev) | |
6643 | return NULL; | |
6644 | return container_of(prev, struct extent_map, rb_node); | |
6645 | } | |
6646 | ||
d352ac68 | 6647 | /* helper for btfs_get_extent. Given an existing extent in the tree, |
e6c4efd8 | 6648 | * the existing extent is the nearest extent to map_start, |
d352ac68 | 6649 | * and an extent that you want to insert, deal with overlap and insert |
e6c4efd8 | 6650 | * the best fitted new extent into the tree. |
d352ac68 | 6651 | */ |
3b951516 CM |
6652 | static int merge_extent_mapping(struct extent_map_tree *em_tree, |
6653 | struct extent_map *existing, | |
e6dcd2dc | 6654 | struct extent_map *em, |
51f395ad | 6655 | u64 map_start) |
3b951516 | 6656 | { |
e6c4efd8 QW |
6657 | struct extent_map *prev; |
6658 | struct extent_map *next; | |
6659 | u64 start; | |
6660 | u64 end; | |
3b951516 | 6661 | u64 start_diff; |
3b951516 | 6662 | |
e6dcd2dc | 6663 | BUG_ON(map_start < em->start || map_start >= extent_map_end(em)); |
e6c4efd8 QW |
6664 | |
6665 | if (existing->start > map_start) { | |
6666 | next = existing; | |
6667 | prev = prev_extent_map(next); | |
6668 | } else { | |
6669 | prev = existing; | |
6670 | next = next_extent_map(prev); | |
6671 | } | |
6672 | ||
6673 | start = prev ? extent_map_end(prev) : em->start; | |
6674 | start = max_t(u64, start, em->start); | |
6675 | end = next ? next->start : extent_map_end(em); | |
6676 | end = min_t(u64, end, extent_map_end(em)); | |
6677 | start_diff = start - em->start; | |
6678 | em->start = start; | |
6679 | em->len = end - start; | |
c8b97818 CM |
6680 | if (em->block_start < EXTENT_MAP_LAST_BYTE && |
6681 | !test_bit(EXTENT_FLAG_COMPRESSED, &em->flags)) { | |
e6dcd2dc | 6682 | em->block_start += start_diff; |
c8b97818 CM |
6683 | em->block_len -= start_diff; |
6684 | } | |
09a2a8f9 | 6685 | return add_extent_mapping(em_tree, em, 0); |
3b951516 CM |
6686 | } |
6687 | ||
c8b97818 | 6688 | static noinline int uncompress_inline(struct btrfs_path *path, |
e40da0e5 | 6689 | struct page *page, |
c8b97818 CM |
6690 | size_t pg_offset, u64 extent_offset, |
6691 | struct btrfs_file_extent_item *item) | |
6692 | { | |
6693 | int ret; | |
6694 | struct extent_buffer *leaf = path->nodes[0]; | |
6695 | char *tmp; | |
6696 | size_t max_size; | |
6697 | unsigned long inline_size; | |
6698 | unsigned long ptr; | |
261507a0 | 6699 | int compress_type; |
c8b97818 CM |
6700 | |
6701 | WARN_ON(pg_offset != 0); | |
261507a0 | 6702 | compress_type = btrfs_file_extent_compression(leaf, item); |
c8b97818 CM |
6703 | max_size = btrfs_file_extent_ram_bytes(leaf, item); |
6704 | inline_size = btrfs_file_extent_inline_item_len(leaf, | |
dd3cc16b | 6705 | btrfs_item_nr(path->slots[0])); |
c8b97818 | 6706 | tmp = kmalloc(inline_size, GFP_NOFS); |
8d413713 TI |
6707 | if (!tmp) |
6708 | return -ENOMEM; | |
c8b97818 CM |
6709 | ptr = btrfs_file_extent_inline_start(item); |
6710 | ||
6711 | read_extent_buffer(leaf, tmp, ptr, inline_size); | |
6712 | ||
5b050f04 | 6713 | max_size = min_t(unsigned long, PAGE_CACHE_SIZE, max_size); |
261507a0 LZ |
6714 | ret = btrfs_decompress(compress_type, tmp, page, |
6715 | extent_offset, inline_size, max_size); | |
c8b97818 | 6716 | kfree(tmp); |
166ae5a4 | 6717 | return ret; |
c8b97818 CM |
6718 | } |
6719 | ||
d352ac68 CM |
6720 | /* |
6721 | * a bit scary, this does extent mapping from logical file offset to the disk. | |
d397712b CM |
6722 | * the ugly parts come from merging extents from the disk with the in-ram |
6723 | * representation. This gets more complex because of the data=ordered code, | |
d352ac68 CM |
6724 | * where the in-ram extents might be locked pending data=ordered completion. |
6725 | * | |
6726 | * This also copies inline extents directly into the page. | |
6727 | */ | |
d397712b | 6728 | |
a52d9a80 | 6729 | struct extent_map *btrfs_get_extent(struct inode *inode, struct page *page, |
70dec807 | 6730 | size_t pg_offset, u64 start, u64 len, |
a52d9a80 CM |
6731 | int create) |
6732 | { | |
6733 | int ret; | |
6734 | int err = 0; | |
a52d9a80 CM |
6735 | u64 extent_start = 0; |
6736 | u64 extent_end = 0; | |
33345d01 | 6737 | u64 objectid = btrfs_ino(inode); |
a52d9a80 | 6738 | u32 found_type; |
f421950f | 6739 | struct btrfs_path *path = NULL; |
a52d9a80 CM |
6740 | struct btrfs_root *root = BTRFS_I(inode)->root; |
6741 | struct btrfs_file_extent_item *item; | |
5f39d397 CM |
6742 | struct extent_buffer *leaf; |
6743 | struct btrfs_key found_key; | |
a52d9a80 CM |
6744 | struct extent_map *em = NULL; |
6745 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; | |
d1310b2e | 6746 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; |
a52d9a80 | 6747 | struct btrfs_trans_handle *trans = NULL; |
7ffbb598 | 6748 | const bool new_inline = !page || create; |
a52d9a80 | 6749 | |
a52d9a80 | 6750 | again: |
890871be | 6751 | read_lock(&em_tree->lock); |
d1310b2e | 6752 | em = lookup_extent_mapping(em_tree, start, len); |
a061fc8d CM |
6753 | if (em) |
6754 | em->bdev = root->fs_info->fs_devices->latest_bdev; | |
890871be | 6755 | read_unlock(&em_tree->lock); |
d1310b2e | 6756 | |
a52d9a80 | 6757 | if (em) { |
e1c4b745 CM |
6758 | if (em->start > start || em->start + em->len <= start) |
6759 | free_extent_map(em); | |
6760 | else if (em->block_start == EXTENT_MAP_INLINE && page) | |
70dec807 CM |
6761 | free_extent_map(em); |
6762 | else | |
6763 | goto out; | |
a52d9a80 | 6764 | } |
172ddd60 | 6765 | em = alloc_extent_map(); |
a52d9a80 | 6766 | if (!em) { |
d1310b2e CM |
6767 | err = -ENOMEM; |
6768 | goto out; | |
a52d9a80 | 6769 | } |
e6dcd2dc | 6770 | em->bdev = root->fs_info->fs_devices->latest_bdev; |
d1310b2e | 6771 | em->start = EXTENT_MAP_HOLE; |
445a6944 | 6772 | em->orig_start = EXTENT_MAP_HOLE; |
d1310b2e | 6773 | em->len = (u64)-1; |
c8b97818 | 6774 | em->block_len = (u64)-1; |
f421950f CM |
6775 | |
6776 | if (!path) { | |
6777 | path = btrfs_alloc_path(); | |
026fd317 JB |
6778 | if (!path) { |
6779 | err = -ENOMEM; | |
6780 | goto out; | |
6781 | } | |
6782 | /* | |
6783 | * Chances are we'll be called again, so go ahead and do | |
6784 | * readahead | |
6785 | */ | |
e4058b54 | 6786 | path->reada = READA_FORWARD; |
f421950f CM |
6787 | } |
6788 | ||
179e29e4 CM |
6789 | ret = btrfs_lookup_file_extent(trans, root, path, |
6790 | objectid, start, trans != NULL); | |
a52d9a80 CM |
6791 | if (ret < 0) { |
6792 | err = ret; | |
6793 | goto out; | |
6794 | } | |
6795 | ||
6796 | if (ret != 0) { | |
6797 | if (path->slots[0] == 0) | |
6798 | goto not_found; | |
6799 | path->slots[0]--; | |
6800 | } | |
6801 | ||
5f39d397 CM |
6802 | leaf = path->nodes[0]; |
6803 | item = btrfs_item_ptr(leaf, path->slots[0], | |
a52d9a80 | 6804 | struct btrfs_file_extent_item); |
a52d9a80 | 6805 | /* are we inside the extent that was found? */ |
5f39d397 | 6806 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); |
962a298f | 6807 | found_type = found_key.type; |
5f39d397 | 6808 | if (found_key.objectid != objectid || |
a52d9a80 | 6809 | found_type != BTRFS_EXTENT_DATA_KEY) { |
25a50341 JB |
6810 | /* |
6811 | * If we backup past the first extent we want to move forward | |
6812 | * and see if there is an extent in front of us, otherwise we'll | |
6813 | * say there is a hole for our whole search range which can | |
6814 | * cause problems. | |
6815 | */ | |
6816 | extent_end = start; | |
6817 | goto next; | |
a52d9a80 CM |
6818 | } |
6819 | ||
5f39d397 CM |
6820 | found_type = btrfs_file_extent_type(leaf, item); |
6821 | extent_start = found_key.offset; | |
d899e052 YZ |
6822 | if (found_type == BTRFS_FILE_EXTENT_REG || |
6823 | found_type == BTRFS_FILE_EXTENT_PREALLOC) { | |
a52d9a80 | 6824 | extent_end = extent_start + |
db94535d | 6825 | btrfs_file_extent_num_bytes(leaf, item); |
9036c102 YZ |
6826 | } else if (found_type == BTRFS_FILE_EXTENT_INLINE) { |
6827 | size_t size; | |
514ac8ad | 6828 | size = btrfs_file_extent_inline_len(leaf, path->slots[0], item); |
fda2832f | 6829 | extent_end = ALIGN(extent_start + size, root->sectorsize); |
9036c102 | 6830 | } |
25a50341 | 6831 | next: |
9036c102 YZ |
6832 | if (start >= extent_end) { |
6833 | path->slots[0]++; | |
6834 | if (path->slots[0] >= btrfs_header_nritems(leaf)) { | |
6835 | ret = btrfs_next_leaf(root, path); | |
6836 | if (ret < 0) { | |
6837 | err = ret; | |
6838 | goto out; | |
a52d9a80 | 6839 | } |
9036c102 YZ |
6840 | if (ret > 0) |
6841 | goto not_found; | |
6842 | leaf = path->nodes[0]; | |
a52d9a80 | 6843 | } |
9036c102 YZ |
6844 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); |
6845 | if (found_key.objectid != objectid || | |
6846 | found_key.type != BTRFS_EXTENT_DATA_KEY) | |
6847 | goto not_found; | |
6848 | if (start + len <= found_key.offset) | |
6849 | goto not_found; | |
e2eca69d WS |
6850 | if (start > found_key.offset) |
6851 | goto next; | |
9036c102 | 6852 | em->start = start; |
70c8a91c | 6853 | em->orig_start = start; |
9036c102 YZ |
6854 | em->len = found_key.offset - start; |
6855 | goto not_found_em; | |
6856 | } | |
6857 | ||
7ffbb598 FM |
6858 | btrfs_extent_item_to_extent_map(inode, path, item, new_inline, em); |
6859 | ||
d899e052 YZ |
6860 | if (found_type == BTRFS_FILE_EXTENT_REG || |
6861 | found_type == BTRFS_FILE_EXTENT_PREALLOC) { | |
a52d9a80 CM |
6862 | goto insert; |
6863 | } else if (found_type == BTRFS_FILE_EXTENT_INLINE) { | |
5f39d397 | 6864 | unsigned long ptr; |
a52d9a80 | 6865 | char *map; |
3326d1b0 CM |
6866 | size_t size; |
6867 | size_t extent_offset; | |
6868 | size_t copy_size; | |
a52d9a80 | 6869 | |
7ffbb598 | 6870 | if (new_inline) |
689f9346 | 6871 | goto out; |
5f39d397 | 6872 | |
514ac8ad | 6873 | size = btrfs_file_extent_inline_len(leaf, path->slots[0], item); |
9036c102 | 6874 | extent_offset = page_offset(page) + pg_offset - extent_start; |
70dec807 | 6875 | copy_size = min_t(u64, PAGE_CACHE_SIZE - pg_offset, |
3326d1b0 | 6876 | size - extent_offset); |
3326d1b0 | 6877 | em->start = extent_start + extent_offset; |
fda2832f | 6878 | em->len = ALIGN(copy_size, root->sectorsize); |
b4939680 | 6879 | em->orig_block_len = em->len; |
70c8a91c | 6880 | em->orig_start = em->start; |
689f9346 | 6881 | ptr = btrfs_file_extent_inline_start(item) + extent_offset; |
179e29e4 | 6882 | if (create == 0 && !PageUptodate(page)) { |
261507a0 LZ |
6883 | if (btrfs_file_extent_compression(leaf, item) != |
6884 | BTRFS_COMPRESS_NONE) { | |
e40da0e5 | 6885 | ret = uncompress_inline(path, page, pg_offset, |
c8b97818 | 6886 | extent_offset, item); |
166ae5a4 ZB |
6887 | if (ret) { |
6888 | err = ret; | |
6889 | goto out; | |
6890 | } | |
c8b97818 CM |
6891 | } else { |
6892 | map = kmap(page); | |
6893 | read_extent_buffer(leaf, map + pg_offset, ptr, | |
6894 | copy_size); | |
93c82d57 CM |
6895 | if (pg_offset + copy_size < PAGE_CACHE_SIZE) { |
6896 | memset(map + pg_offset + copy_size, 0, | |
6897 | PAGE_CACHE_SIZE - pg_offset - | |
6898 | copy_size); | |
6899 | } | |
c8b97818 CM |
6900 | kunmap(page); |
6901 | } | |
179e29e4 CM |
6902 | flush_dcache_page(page); |
6903 | } else if (create && PageUptodate(page)) { | |
6bf7e080 | 6904 | BUG(); |
179e29e4 CM |
6905 | if (!trans) { |
6906 | kunmap(page); | |
6907 | free_extent_map(em); | |
6908 | em = NULL; | |
ff5714cc | 6909 | |
b3b4aa74 | 6910 | btrfs_release_path(path); |
7a7eaa40 | 6911 | trans = btrfs_join_transaction(root); |
ff5714cc | 6912 | |
3612b495 TI |
6913 | if (IS_ERR(trans)) |
6914 | return ERR_CAST(trans); | |
179e29e4 CM |
6915 | goto again; |
6916 | } | |
c8b97818 | 6917 | map = kmap(page); |
70dec807 | 6918 | write_extent_buffer(leaf, map + pg_offset, ptr, |
179e29e4 | 6919 | copy_size); |
c8b97818 | 6920 | kunmap(page); |
179e29e4 | 6921 | btrfs_mark_buffer_dirty(leaf); |
a52d9a80 | 6922 | } |
d1310b2e | 6923 | set_extent_uptodate(io_tree, em->start, |
507903b8 | 6924 | extent_map_end(em) - 1, NULL, GFP_NOFS); |
a52d9a80 | 6925 | goto insert; |
a52d9a80 CM |
6926 | } |
6927 | not_found: | |
6928 | em->start = start; | |
70c8a91c | 6929 | em->orig_start = start; |
d1310b2e | 6930 | em->len = len; |
a52d9a80 | 6931 | not_found_em: |
5f39d397 | 6932 | em->block_start = EXTENT_MAP_HOLE; |
9036c102 | 6933 | set_bit(EXTENT_FLAG_VACANCY, &em->flags); |
a52d9a80 | 6934 | insert: |
b3b4aa74 | 6935 | btrfs_release_path(path); |
d1310b2e | 6936 | if (em->start > start || extent_map_end(em) <= start) { |
c2cf52eb | 6937 | btrfs_err(root->fs_info, "bad extent! em: [%llu %llu] passed [%llu %llu]", |
c1c9ff7c | 6938 | em->start, em->len, start, len); |
a52d9a80 CM |
6939 | err = -EIO; |
6940 | goto out; | |
6941 | } | |
d1310b2e CM |
6942 | |
6943 | err = 0; | |
890871be | 6944 | write_lock(&em_tree->lock); |
09a2a8f9 | 6945 | ret = add_extent_mapping(em_tree, em, 0); |
3b951516 CM |
6946 | /* it is possible that someone inserted the extent into the tree |
6947 | * while we had the lock dropped. It is also possible that | |
6948 | * an overlapping map exists in the tree | |
6949 | */ | |
a52d9a80 | 6950 | if (ret == -EEXIST) { |
3b951516 | 6951 | struct extent_map *existing; |
e6dcd2dc CM |
6952 | |
6953 | ret = 0; | |
6954 | ||
e6c4efd8 QW |
6955 | existing = search_extent_mapping(em_tree, start, len); |
6956 | /* | |
6957 | * existing will always be non-NULL, since there must be | |
6958 | * extent causing the -EEXIST. | |
6959 | */ | |
6960 | if (start >= extent_map_end(existing) || | |
32be3a1a | 6961 | start <= existing->start) { |
e6c4efd8 QW |
6962 | /* |
6963 | * The existing extent map is the one nearest to | |
6964 | * the [start, start + len) range which overlaps | |
6965 | */ | |
6966 | err = merge_extent_mapping(em_tree, existing, | |
6967 | em, start); | |
e1c4b745 | 6968 | free_extent_map(existing); |
e6c4efd8 | 6969 | if (err) { |
3b951516 CM |
6970 | free_extent_map(em); |
6971 | em = NULL; | |
6972 | } | |
6973 | } else { | |
6974 | free_extent_map(em); | |
6975 | em = existing; | |
e6dcd2dc | 6976 | err = 0; |
a52d9a80 | 6977 | } |
a52d9a80 | 6978 | } |
890871be | 6979 | write_unlock(&em_tree->lock); |
a52d9a80 | 6980 | out: |
1abe9b8a | 6981 | |
4cd8587c | 6982 | trace_btrfs_get_extent(root, em); |
1abe9b8a | 6983 | |
527afb44 | 6984 | btrfs_free_path(path); |
a52d9a80 CM |
6985 | if (trans) { |
6986 | ret = btrfs_end_transaction(trans, root); | |
d397712b | 6987 | if (!err) |
a52d9a80 CM |
6988 | err = ret; |
6989 | } | |
a52d9a80 CM |
6990 | if (err) { |
6991 | free_extent_map(em); | |
a52d9a80 CM |
6992 | return ERR_PTR(err); |
6993 | } | |
79787eaa | 6994 | BUG_ON(!em); /* Error is always set */ |
a52d9a80 CM |
6995 | return em; |
6996 | } | |
6997 | ||
ec29ed5b CM |
6998 | struct extent_map *btrfs_get_extent_fiemap(struct inode *inode, struct page *page, |
6999 | size_t pg_offset, u64 start, u64 len, | |
7000 | int create) | |
7001 | { | |
7002 | struct extent_map *em; | |
7003 | struct extent_map *hole_em = NULL; | |
7004 | u64 range_start = start; | |
7005 | u64 end; | |
7006 | u64 found; | |
7007 | u64 found_end; | |
7008 | int err = 0; | |
7009 | ||
7010 | em = btrfs_get_extent(inode, page, pg_offset, start, len, create); | |
7011 | if (IS_ERR(em)) | |
7012 | return em; | |
7013 | if (em) { | |
7014 | /* | |
f9e4fb53 LB |
7015 | * if our em maps to |
7016 | * - a hole or | |
7017 | * - a pre-alloc extent, | |
7018 | * there might actually be delalloc bytes behind it. | |
ec29ed5b | 7019 | */ |
f9e4fb53 LB |
7020 | if (em->block_start != EXTENT_MAP_HOLE && |
7021 | !test_bit(EXTENT_FLAG_PREALLOC, &em->flags)) | |
ec29ed5b CM |
7022 | return em; |
7023 | else | |
7024 | hole_em = em; | |
7025 | } | |
7026 | ||
7027 | /* check to see if we've wrapped (len == -1 or similar) */ | |
7028 | end = start + len; | |
7029 | if (end < start) | |
7030 | end = (u64)-1; | |
7031 | else | |
7032 | end -= 1; | |
7033 | ||
7034 | em = NULL; | |
7035 | ||
7036 | /* ok, we didn't find anything, lets look for delalloc */ | |
7037 | found = count_range_bits(&BTRFS_I(inode)->io_tree, &range_start, | |
7038 | end, len, EXTENT_DELALLOC, 1); | |
7039 | found_end = range_start + found; | |
7040 | if (found_end < range_start) | |
7041 | found_end = (u64)-1; | |
7042 | ||
7043 | /* | |
7044 | * we didn't find anything useful, return | |
7045 | * the original results from get_extent() | |
7046 | */ | |
7047 | if (range_start > end || found_end <= start) { | |
7048 | em = hole_em; | |
7049 | hole_em = NULL; | |
7050 | goto out; | |
7051 | } | |
7052 | ||
7053 | /* adjust the range_start to make sure it doesn't | |
7054 | * go backwards from the start they passed in | |
7055 | */ | |
67871254 | 7056 | range_start = max(start, range_start); |
ec29ed5b CM |
7057 | found = found_end - range_start; |
7058 | ||
7059 | if (found > 0) { | |
7060 | u64 hole_start = start; | |
7061 | u64 hole_len = len; | |
7062 | ||
172ddd60 | 7063 | em = alloc_extent_map(); |
ec29ed5b CM |
7064 | if (!em) { |
7065 | err = -ENOMEM; | |
7066 | goto out; | |
7067 | } | |
7068 | /* | |
7069 | * when btrfs_get_extent can't find anything it | |
7070 | * returns one huge hole | |
7071 | * | |
7072 | * make sure what it found really fits our range, and | |
7073 | * adjust to make sure it is based on the start from | |
7074 | * the caller | |
7075 | */ | |
7076 | if (hole_em) { | |
7077 | u64 calc_end = extent_map_end(hole_em); | |
7078 | ||
7079 | if (calc_end <= start || (hole_em->start > end)) { | |
7080 | free_extent_map(hole_em); | |
7081 | hole_em = NULL; | |
7082 | } else { | |
7083 | hole_start = max(hole_em->start, start); | |
7084 | hole_len = calc_end - hole_start; | |
7085 | } | |
7086 | } | |
7087 | em->bdev = NULL; | |
7088 | if (hole_em && range_start > hole_start) { | |
7089 | /* our hole starts before our delalloc, so we | |
7090 | * have to return just the parts of the hole | |
7091 | * that go until the delalloc starts | |
7092 | */ | |
7093 | em->len = min(hole_len, | |
7094 | range_start - hole_start); | |
7095 | em->start = hole_start; | |
7096 | em->orig_start = hole_start; | |
7097 | /* | |
7098 | * don't adjust block start at all, | |
7099 | * it is fixed at EXTENT_MAP_HOLE | |
7100 | */ | |
7101 | em->block_start = hole_em->block_start; | |
7102 | em->block_len = hole_len; | |
f9e4fb53 LB |
7103 | if (test_bit(EXTENT_FLAG_PREALLOC, &hole_em->flags)) |
7104 | set_bit(EXTENT_FLAG_PREALLOC, &em->flags); | |
ec29ed5b CM |
7105 | } else { |
7106 | em->start = range_start; | |
7107 | em->len = found; | |
7108 | em->orig_start = range_start; | |
7109 | em->block_start = EXTENT_MAP_DELALLOC; | |
7110 | em->block_len = found; | |
7111 | } | |
7112 | } else if (hole_em) { | |
7113 | return hole_em; | |
7114 | } | |
7115 | out: | |
7116 | ||
7117 | free_extent_map(hole_em); | |
7118 | if (err) { | |
7119 | free_extent_map(em); | |
7120 | return ERR_PTR(err); | |
7121 | } | |
7122 | return em; | |
7123 | } | |
7124 | ||
4b46fce2 JB |
7125 | static struct extent_map *btrfs_new_extent_direct(struct inode *inode, |
7126 | u64 start, u64 len) | |
7127 | { | |
7128 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
70c8a91c | 7129 | struct extent_map *em; |
4b46fce2 JB |
7130 | struct btrfs_key ins; |
7131 | u64 alloc_hint; | |
7132 | int ret; | |
4b46fce2 | 7133 | |
4b46fce2 | 7134 | alloc_hint = get_extent_allocation_hint(inode, start, len); |
00361589 | 7135 | ret = btrfs_reserve_extent(root, len, root->sectorsize, 0, |
e570fd27 | 7136 | alloc_hint, &ins, 1, 1); |
00361589 JB |
7137 | if (ret) |
7138 | return ERR_PTR(ret); | |
4b46fce2 | 7139 | |
70c8a91c | 7140 | em = create_pinned_em(inode, start, ins.offset, start, ins.objectid, |
cc95bef6 | 7141 | ins.offset, ins.offset, ins.offset, 0); |
00361589 | 7142 | if (IS_ERR(em)) { |
e570fd27 | 7143 | btrfs_free_reserved_extent(root, ins.objectid, ins.offset, 1); |
00361589 JB |
7144 | return em; |
7145 | } | |
4b46fce2 JB |
7146 | |
7147 | ret = btrfs_add_ordered_extent_dio(inode, start, ins.objectid, | |
7148 | ins.offset, ins.offset, 0); | |
7149 | if (ret) { | |
e570fd27 | 7150 | btrfs_free_reserved_extent(root, ins.objectid, ins.offset, 1); |
00361589 JB |
7151 | free_extent_map(em); |
7152 | return ERR_PTR(ret); | |
4b46fce2 | 7153 | } |
00361589 | 7154 | |
4b46fce2 JB |
7155 | return em; |
7156 | } | |
7157 | ||
46bfbb5c CM |
7158 | /* |
7159 | * returns 1 when the nocow is safe, < 1 on error, 0 if the | |
7160 | * block must be cow'd | |
7161 | */ | |
00361589 | 7162 | noinline int can_nocow_extent(struct inode *inode, u64 offset, u64 *len, |
7ee9e440 JB |
7163 | u64 *orig_start, u64 *orig_block_len, |
7164 | u64 *ram_bytes) | |
46bfbb5c | 7165 | { |
00361589 | 7166 | struct btrfs_trans_handle *trans; |
46bfbb5c CM |
7167 | struct btrfs_path *path; |
7168 | int ret; | |
7169 | struct extent_buffer *leaf; | |
7170 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
7b2b7085 | 7171 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; |
46bfbb5c CM |
7172 | struct btrfs_file_extent_item *fi; |
7173 | struct btrfs_key key; | |
7174 | u64 disk_bytenr; | |
7175 | u64 backref_offset; | |
7176 | u64 extent_end; | |
7177 | u64 num_bytes; | |
7178 | int slot; | |
7179 | int found_type; | |
7ee9e440 | 7180 | bool nocow = (BTRFS_I(inode)->flags & BTRFS_INODE_NODATACOW); |
e77751aa | 7181 | |
46bfbb5c CM |
7182 | path = btrfs_alloc_path(); |
7183 | if (!path) | |
7184 | return -ENOMEM; | |
7185 | ||
00361589 | 7186 | ret = btrfs_lookup_file_extent(NULL, root, path, btrfs_ino(inode), |
46bfbb5c CM |
7187 | offset, 0); |
7188 | if (ret < 0) | |
7189 | goto out; | |
7190 | ||
7191 | slot = path->slots[0]; | |
7192 | if (ret == 1) { | |
7193 | if (slot == 0) { | |
7194 | /* can't find the item, must cow */ | |
7195 | ret = 0; | |
7196 | goto out; | |
7197 | } | |
7198 | slot--; | |
7199 | } | |
7200 | ret = 0; | |
7201 | leaf = path->nodes[0]; | |
7202 | btrfs_item_key_to_cpu(leaf, &key, slot); | |
33345d01 | 7203 | if (key.objectid != btrfs_ino(inode) || |
46bfbb5c CM |
7204 | key.type != BTRFS_EXTENT_DATA_KEY) { |
7205 | /* not our file or wrong item type, must cow */ | |
7206 | goto out; | |
7207 | } | |
7208 | ||
7209 | if (key.offset > offset) { | |
7210 | /* Wrong offset, must cow */ | |
7211 | goto out; | |
7212 | } | |
7213 | ||
7214 | fi = btrfs_item_ptr(leaf, slot, struct btrfs_file_extent_item); | |
7215 | found_type = btrfs_file_extent_type(leaf, fi); | |
7216 | if (found_type != BTRFS_FILE_EXTENT_REG && | |
7217 | found_type != BTRFS_FILE_EXTENT_PREALLOC) { | |
7218 | /* not a regular extent, must cow */ | |
7219 | goto out; | |
7220 | } | |
7ee9e440 JB |
7221 | |
7222 | if (!nocow && found_type == BTRFS_FILE_EXTENT_REG) | |
7223 | goto out; | |
7224 | ||
e77751aa MX |
7225 | extent_end = key.offset + btrfs_file_extent_num_bytes(leaf, fi); |
7226 | if (extent_end <= offset) | |
7227 | goto out; | |
7228 | ||
46bfbb5c | 7229 | disk_bytenr = btrfs_file_extent_disk_bytenr(leaf, fi); |
7ee9e440 JB |
7230 | if (disk_bytenr == 0) |
7231 | goto out; | |
7232 | ||
7233 | if (btrfs_file_extent_compression(leaf, fi) || | |
7234 | btrfs_file_extent_encryption(leaf, fi) || | |
7235 | btrfs_file_extent_other_encoding(leaf, fi)) | |
7236 | goto out; | |
7237 | ||
46bfbb5c CM |
7238 | backref_offset = btrfs_file_extent_offset(leaf, fi); |
7239 | ||
7ee9e440 JB |
7240 | if (orig_start) { |
7241 | *orig_start = key.offset - backref_offset; | |
7242 | *orig_block_len = btrfs_file_extent_disk_num_bytes(leaf, fi); | |
7243 | *ram_bytes = btrfs_file_extent_ram_bytes(leaf, fi); | |
7244 | } | |
eb384b55 | 7245 | |
46bfbb5c CM |
7246 | if (btrfs_extent_readonly(root, disk_bytenr)) |
7247 | goto out; | |
7b2b7085 MX |
7248 | |
7249 | num_bytes = min(offset + *len, extent_end) - offset; | |
7250 | if (!nocow && found_type == BTRFS_FILE_EXTENT_PREALLOC) { | |
7251 | u64 range_end; | |
7252 | ||
7253 | range_end = round_up(offset + num_bytes, root->sectorsize) - 1; | |
7254 | ret = test_range_bit(io_tree, offset, range_end, | |
7255 | EXTENT_DELALLOC, 0, NULL); | |
7256 | if (ret) { | |
7257 | ret = -EAGAIN; | |
7258 | goto out; | |
7259 | } | |
7260 | } | |
7261 | ||
1bda19eb | 7262 | btrfs_release_path(path); |
46bfbb5c CM |
7263 | |
7264 | /* | |
7265 | * look for other files referencing this extent, if we | |
7266 | * find any we must cow | |
7267 | */ | |
00361589 JB |
7268 | trans = btrfs_join_transaction(root); |
7269 | if (IS_ERR(trans)) { | |
7270 | ret = 0; | |
46bfbb5c | 7271 | goto out; |
00361589 JB |
7272 | } |
7273 | ||
7274 | ret = btrfs_cross_ref_exist(trans, root, btrfs_ino(inode), | |
7275 | key.offset - backref_offset, disk_bytenr); | |
7276 | btrfs_end_transaction(trans, root); | |
7277 | if (ret) { | |
7278 | ret = 0; | |
7279 | goto out; | |
7280 | } | |
46bfbb5c CM |
7281 | |
7282 | /* | |
7283 | * adjust disk_bytenr and num_bytes to cover just the bytes | |
7284 | * in this extent we are about to write. If there | |
7285 | * are any csums in that range we have to cow in order | |
7286 | * to keep the csums correct | |
7287 | */ | |
7288 | disk_bytenr += backref_offset; | |
7289 | disk_bytenr += offset - key.offset; | |
46bfbb5c CM |
7290 | if (csum_exist_in_range(root, disk_bytenr, num_bytes)) |
7291 | goto out; | |
7292 | /* | |
7293 | * all of the above have passed, it is safe to overwrite this extent | |
7294 | * without cow | |
7295 | */ | |
eb384b55 | 7296 | *len = num_bytes; |
46bfbb5c CM |
7297 | ret = 1; |
7298 | out: | |
7299 | btrfs_free_path(path); | |
7300 | return ret; | |
7301 | } | |
7302 | ||
fc4adbff AG |
7303 | bool btrfs_page_exists_in_range(struct inode *inode, loff_t start, loff_t end) |
7304 | { | |
7305 | struct radix_tree_root *root = &inode->i_mapping->page_tree; | |
7306 | int found = false; | |
7307 | void **pagep = NULL; | |
7308 | struct page *page = NULL; | |
7309 | int start_idx; | |
7310 | int end_idx; | |
7311 | ||
7312 | start_idx = start >> PAGE_CACHE_SHIFT; | |
7313 | ||
7314 | /* | |
7315 | * end is the last byte in the last page. end == start is legal | |
7316 | */ | |
7317 | end_idx = end >> PAGE_CACHE_SHIFT; | |
7318 | ||
7319 | rcu_read_lock(); | |
7320 | ||
7321 | /* Most of the code in this while loop is lifted from | |
7322 | * find_get_page. It's been modified to begin searching from a | |
7323 | * page and return just the first page found in that range. If the | |
7324 | * found idx is less than or equal to the end idx then we know that | |
7325 | * a page exists. If no pages are found or if those pages are | |
7326 | * outside of the range then we're fine (yay!) */ | |
7327 | while (page == NULL && | |
7328 | radix_tree_gang_lookup_slot(root, &pagep, NULL, start_idx, 1)) { | |
7329 | page = radix_tree_deref_slot(pagep); | |
7330 | if (unlikely(!page)) | |
7331 | break; | |
7332 | ||
7333 | if (radix_tree_exception(page)) { | |
809f9016 FM |
7334 | if (radix_tree_deref_retry(page)) { |
7335 | page = NULL; | |
fc4adbff | 7336 | continue; |
809f9016 | 7337 | } |
fc4adbff AG |
7338 | /* |
7339 | * Otherwise, shmem/tmpfs must be storing a swap entry | |
7340 | * here as an exceptional entry: so return it without | |
7341 | * attempting to raise page count. | |
7342 | */ | |
6fdef6d4 | 7343 | page = NULL; |
fc4adbff AG |
7344 | break; /* TODO: Is this relevant for this use case? */ |
7345 | } | |
7346 | ||
91405151 FM |
7347 | if (!page_cache_get_speculative(page)) { |
7348 | page = NULL; | |
fc4adbff | 7349 | continue; |
91405151 | 7350 | } |
fc4adbff AG |
7351 | |
7352 | /* | |
7353 | * Has the page moved? | |
7354 | * This is part of the lockless pagecache protocol. See | |
7355 | * include/linux/pagemap.h for details. | |
7356 | */ | |
7357 | if (unlikely(page != *pagep)) { | |
7358 | page_cache_release(page); | |
7359 | page = NULL; | |
7360 | } | |
7361 | } | |
7362 | ||
7363 | if (page) { | |
7364 | if (page->index <= end_idx) | |
7365 | found = true; | |
7366 | page_cache_release(page); | |
7367 | } | |
7368 | ||
7369 | rcu_read_unlock(); | |
7370 | return found; | |
7371 | } | |
7372 | ||
eb838e73 JB |
7373 | static int lock_extent_direct(struct inode *inode, u64 lockstart, u64 lockend, |
7374 | struct extent_state **cached_state, int writing) | |
7375 | { | |
7376 | struct btrfs_ordered_extent *ordered; | |
7377 | int ret = 0; | |
7378 | ||
7379 | while (1) { | |
7380 | lock_extent_bits(&BTRFS_I(inode)->io_tree, lockstart, lockend, | |
ff13db41 | 7381 | cached_state); |
eb838e73 JB |
7382 | /* |
7383 | * We're concerned with the entire range that we're going to be | |
7384 | * doing DIO to, so we need to make sure theres no ordered | |
7385 | * extents in this range. | |
7386 | */ | |
7387 | ordered = btrfs_lookup_ordered_range(inode, lockstart, | |
7388 | lockend - lockstart + 1); | |
7389 | ||
7390 | /* | |
7391 | * We need to make sure there are no buffered pages in this | |
7392 | * range either, we could have raced between the invalidate in | |
7393 | * generic_file_direct_write and locking the extent. The | |
7394 | * invalidate needs to happen so that reads after a write do not | |
7395 | * get stale data. | |
7396 | */ | |
fc4adbff AG |
7397 | if (!ordered && |
7398 | (!writing || | |
7399 | !btrfs_page_exists_in_range(inode, lockstart, lockend))) | |
eb838e73 JB |
7400 | break; |
7401 | ||
7402 | unlock_extent_cached(&BTRFS_I(inode)->io_tree, lockstart, lockend, | |
7403 | cached_state, GFP_NOFS); | |
7404 | ||
7405 | if (ordered) { | |
7406 | btrfs_start_ordered_extent(inode, ordered, 1); | |
7407 | btrfs_put_ordered_extent(ordered); | |
7408 | } else { | |
eb838e73 | 7409 | /* |
b850ae14 FM |
7410 | * We could trigger writeback for this range (and wait |
7411 | * for it to complete) and then invalidate the pages for | |
7412 | * this range (through invalidate_inode_pages2_range()), | |
7413 | * but that can lead us to a deadlock with a concurrent | |
7414 | * call to readpages() (a buffered read or a defrag call | |
7415 | * triggered a readahead) on a page lock due to an | |
7416 | * ordered dio extent we created before but did not have | |
7417 | * yet a corresponding bio submitted (whence it can not | |
7418 | * complete), which makes readpages() wait for that | |
7419 | * ordered extent to complete while holding a lock on | |
7420 | * that page. | |
eb838e73 | 7421 | */ |
b850ae14 FM |
7422 | ret = -ENOTBLK; |
7423 | break; | |
eb838e73 JB |
7424 | } |
7425 | ||
7426 | cond_resched(); | |
7427 | } | |
7428 | ||
7429 | return ret; | |
7430 | } | |
7431 | ||
69ffb543 JB |
7432 | static struct extent_map *create_pinned_em(struct inode *inode, u64 start, |
7433 | u64 len, u64 orig_start, | |
7434 | u64 block_start, u64 block_len, | |
cc95bef6 JB |
7435 | u64 orig_block_len, u64 ram_bytes, |
7436 | int type) | |
69ffb543 JB |
7437 | { |
7438 | struct extent_map_tree *em_tree; | |
7439 | struct extent_map *em; | |
7440 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
7441 | int ret; | |
7442 | ||
7443 | em_tree = &BTRFS_I(inode)->extent_tree; | |
7444 | em = alloc_extent_map(); | |
7445 | if (!em) | |
7446 | return ERR_PTR(-ENOMEM); | |
7447 | ||
7448 | em->start = start; | |
7449 | em->orig_start = orig_start; | |
2ab28f32 JB |
7450 | em->mod_start = start; |
7451 | em->mod_len = len; | |
69ffb543 JB |
7452 | em->len = len; |
7453 | em->block_len = block_len; | |
7454 | em->block_start = block_start; | |
7455 | em->bdev = root->fs_info->fs_devices->latest_bdev; | |
b4939680 | 7456 | em->orig_block_len = orig_block_len; |
cc95bef6 | 7457 | em->ram_bytes = ram_bytes; |
70c8a91c | 7458 | em->generation = -1; |
69ffb543 JB |
7459 | set_bit(EXTENT_FLAG_PINNED, &em->flags); |
7460 | if (type == BTRFS_ORDERED_PREALLOC) | |
b11e234d | 7461 | set_bit(EXTENT_FLAG_FILLING, &em->flags); |
69ffb543 JB |
7462 | |
7463 | do { | |
7464 | btrfs_drop_extent_cache(inode, em->start, | |
7465 | em->start + em->len - 1, 0); | |
7466 | write_lock(&em_tree->lock); | |
09a2a8f9 | 7467 | ret = add_extent_mapping(em_tree, em, 1); |
69ffb543 JB |
7468 | write_unlock(&em_tree->lock); |
7469 | } while (ret == -EEXIST); | |
7470 | ||
7471 | if (ret) { | |
7472 | free_extent_map(em); | |
7473 | return ERR_PTR(ret); | |
7474 | } | |
7475 | ||
7476 | return em; | |
7477 | } | |
7478 | ||
9c9464cc FM |
7479 | static void adjust_dio_outstanding_extents(struct inode *inode, |
7480 | struct btrfs_dio_data *dio_data, | |
7481 | const u64 len) | |
7482 | { | |
7483 | unsigned num_extents; | |
7484 | ||
7485 | num_extents = (unsigned) div64_u64(len + BTRFS_MAX_EXTENT_SIZE - 1, | |
7486 | BTRFS_MAX_EXTENT_SIZE); | |
7487 | /* | |
7488 | * If we have an outstanding_extents count still set then we're | |
7489 | * within our reservation, otherwise we need to adjust our inode | |
7490 | * counter appropriately. | |
7491 | */ | |
7492 | if (dio_data->outstanding_extents) { | |
7493 | dio_data->outstanding_extents -= num_extents; | |
7494 | } else { | |
7495 | spin_lock(&BTRFS_I(inode)->lock); | |
7496 | BTRFS_I(inode)->outstanding_extents += num_extents; | |
7497 | spin_unlock(&BTRFS_I(inode)->lock); | |
7498 | } | |
7499 | } | |
7500 | ||
4b46fce2 JB |
7501 | static int btrfs_get_blocks_direct(struct inode *inode, sector_t iblock, |
7502 | struct buffer_head *bh_result, int create) | |
7503 | { | |
7504 | struct extent_map *em; | |
7505 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
eb838e73 | 7506 | struct extent_state *cached_state = NULL; |
50745b0a | 7507 | struct btrfs_dio_data *dio_data = NULL; |
4b46fce2 | 7508 | u64 start = iblock << inode->i_blkbits; |
eb838e73 | 7509 | u64 lockstart, lockend; |
4b46fce2 | 7510 | u64 len = bh_result->b_size; |
eb838e73 | 7511 | int unlock_bits = EXTENT_LOCKED; |
0934856d | 7512 | int ret = 0; |
eb838e73 | 7513 | |
172a5049 | 7514 | if (create) |
3266789f | 7515 | unlock_bits |= EXTENT_DIRTY; |
172a5049 | 7516 | else |
c329861d | 7517 | len = min_t(u64, len, root->sectorsize); |
eb838e73 | 7518 | |
c329861d JB |
7519 | lockstart = start; |
7520 | lockend = start + len - 1; | |
7521 | ||
e1cbbfa5 JB |
7522 | if (current->journal_info) { |
7523 | /* | |
7524 | * Need to pull our outstanding extents and set journal_info to NULL so | |
7525 | * that anything that needs to check if there's a transction doesn't get | |
7526 | * confused. | |
7527 | */ | |
50745b0a | 7528 | dio_data = current->journal_info; |
e1cbbfa5 JB |
7529 | current->journal_info = NULL; |
7530 | } | |
7531 | ||
eb838e73 JB |
7532 | /* |
7533 | * If this errors out it's because we couldn't invalidate pagecache for | |
7534 | * this range and we need to fallback to buffered. | |
7535 | */ | |
9c9464cc FM |
7536 | if (lock_extent_direct(inode, lockstart, lockend, &cached_state, |
7537 | create)) { | |
7538 | ret = -ENOTBLK; | |
7539 | goto err; | |
7540 | } | |
eb838e73 | 7541 | |
4b46fce2 | 7542 | em = btrfs_get_extent(inode, NULL, 0, start, len, 0); |
eb838e73 JB |
7543 | if (IS_ERR(em)) { |
7544 | ret = PTR_ERR(em); | |
7545 | goto unlock_err; | |
7546 | } | |
4b46fce2 JB |
7547 | |
7548 | /* | |
7549 | * Ok for INLINE and COMPRESSED extents we need to fallback on buffered | |
7550 | * io. INLINE is special, and we could probably kludge it in here, but | |
7551 | * it's still buffered so for safety lets just fall back to the generic | |
7552 | * buffered path. | |
7553 | * | |
7554 | * For COMPRESSED we _have_ to read the entire extent in so we can | |
7555 | * decompress it, so there will be buffering required no matter what we | |
7556 | * do, so go ahead and fallback to buffered. | |
7557 | * | |
7558 | * We return -ENOTBLK because thats what makes DIO go ahead and go back | |
7559 | * to buffered IO. Don't blame me, this is the price we pay for using | |
7560 | * the generic code. | |
7561 | */ | |
7562 | if (test_bit(EXTENT_FLAG_COMPRESSED, &em->flags) || | |
7563 | em->block_start == EXTENT_MAP_INLINE) { | |
7564 | free_extent_map(em); | |
eb838e73 JB |
7565 | ret = -ENOTBLK; |
7566 | goto unlock_err; | |
4b46fce2 JB |
7567 | } |
7568 | ||
7569 | /* Just a good old fashioned hole, return */ | |
7570 | if (!create && (em->block_start == EXTENT_MAP_HOLE || | |
7571 | test_bit(EXTENT_FLAG_PREALLOC, &em->flags))) { | |
7572 | free_extent_map(em); | |
eb838e73 | 7573 | goto unlock_err; |
4b46fce2 JB |
7574 | } |
7575 | ||
7576 | /* | |
7577 | * We don't allocate a new extent in the following cases | |
7578 | * | |
7579 | * 1) The inode is marked as NODATACOW. In this case we'll just use the | |
7580 | * existing extent. | |
7581 | * 2) The extent is marked as PREALLOC. We're good to go here and can | |
7582 | * just use the extent. | |
7583 | * | |
7584 | */ | |
46bfbb5c | 7585 | if (!create) { |
eb838e73 JB |
7586 | len = min(len, em->len - (start - em->start)); |
7587 | lockstart = start + len; | |
7588 | goto unlock; | |
46bfbb5c | 7589 | } |
4b46fce2 JB |
7590 | |
7591 | if (test_bit(EXTENT_FLAG_PREALLOC, &em->flags) || | |
7592 | ((BTRFS_I(inode)->flags & BTRFS_INODE_NODATACOW) && | |
7593 | em->block_start != EXTENT_MAP_HOLE)) { | |
4b46fce2 | 7594 | int type; |
eb384b55 | 7595 | u64 block_start, orig_start, orig_block_len, ram_bytes; |
4b46fce2 JB |
7596 | |
7597 | if (test_bit(EXTENT_FLAG_PREALLOC, &em->flags)) | |
7598 | type = BTRFS_ORDERED_PREALLOC; | |
7599 | else | |
7600 | type = BTRFS_ORDERED_NOCOW; | |
46bfbb5c | 7601 | len = min(len, em->len - (start - em->start)); |
4b46fce2 | 7602 | block_start = em->block_start + (start - em->start); |
46bfbb5c | 7603 | |
00361589 | 7604 | if (can_nocow_extent(inode, start, &len, &orig_start, |
7ee9e440 | 7605 | &orig_block_len, &ram_bytes) == 1) { |
69ffb543 JB |
7606 | if (type == BTRFS_ORDERED_PREALLOC) { |
7607 | free_extent_map(em); | |
7608 | em = create_pinned_em(inode, start, len, | |
7609 | orig_start, | |
b4939680 | 7610 | block_start, len, |
cc95bef6 JB |
7611 | orig_block_len, |
7612 | ram_bytes, type); | |
555e1286 FM |
7613 | if (IS_ERR(em)) { |
7614 | ret = PTR_ERR(em); | |
69ffb543 | 7615 | goto unlock_err; |
555e1286 | 7616 | } |
69ffb543 JB |
7617 | } |
7618 | ||
46bfbb5c CM |
7619 | ret = btrfs_add_ordered_extent_dio(inode, start, |
7620 | block_start, len, len, type); | |
46bfbb5c CM |
7621 | if (ret) { |
7622 | free_extent_map(em); | |
eb838e73 | 7623 | goto unlock_err; |
46bfbb5c CM |
7624 | } |
7625 | goto unlock; | |
4b46fce2 | 7626 | } |
4b46fce2 | 7627 | } |
00361589 | 7628 | |
46bfbb5c CM |
7629 | /* |
7630 | * this will cow the extent, reset the len in case we changed | |
7631 | * it above | |
7632 | */ | |
7633 | len = bh_result->b_size; | |
70c8a91c JB |
7634 | free_extent_map(em); |
7635 | em = btrfs_new_extent_direct(inode, start, len); | |
eb838e73 JB |
7636 | if (IS_ERR(em)) { |
7637 | ret = PTR_ERR(em); | |
7638 | goto unlock_err; | |
7639 | } | |
46bfbb5c CM |
7640 | len = min(len, em->len - (start - em->start)); |
7641 | unlock: | |
4b46fce2 JB |
7642 | bh_result->b_blocknr = (em->block_start + (start - em->start)) >> |
7643 | inode->i_blkbits; | |
46bfbb5c | 7644 | bh_result->b_size = len; |
4b46fce2 JB |
7645 | bh_result->b_bdev = em->bdev; |
7646 | set_buffer_mapped(bh_result); | |
c3473e83 JB |
7647 | if (create) { |
7648 | if (!test_bit(EXTENT_FLAG_PREALLOC, &em->flags)) | |
7649 | set_buffer_new(bh_result); | |
7650 | ||
7651 | /* | |
7652 | * Need to update the i_size under the extent lock so buffered | |
7653 | * readers will get the updated i_size when we unlock. | |
7654 | */ | |
7655 | if (start + len > i_size_read(inode)) | |
7656 | i_size_write(inode, start + len); | |
0934856d | 7657 | |
9c9464cc | 7658 | adjust_dio_outstanding_extents(inode, dio_data, len); |
7cf5b976 | 7659 | btrfs_free_reserved_data_space(inode, start, len); |
50745b0a | 7660 | WARN_ON(dio_data->reserve < len); |
7661 | dio_data->reserve -= len; | |
f28a4928 | 7662 | dio_data->unsubmitted_oe_range_end = start + len; |
50745b0a | 7663 | current->journal_info = dio_data; |
c3473e83 | 7664 | } |
4b46fce2 | 7665 | |
eb838e73 JB |
7666 | /* |
7667 | * In the case of write we need to clear and unlock the entire range, | |
7668 | * in the case of read we need to unlock only the end area that we | |
7669 | * aren't using if there is any left over space. | |
7670 | */ | |
24c03fa5 | 7671 | if (lockstart < lockend) { |
0934856d MX |
7672 | clear_extent_bit(&BTRFS_I(inode)->io_tree, lockstart, |
7673 | lockend, unlock_bits, 1, 0, | |
7674 | &cached_state, GFP_NOFS); | |
24c03fa5 | 7675 | } else { |
eb838e73 | 7676 | free_extent_state(cached_state); |
24c03fa5 | 7677 | } |
eb838e73 | 7678 | |
4b46fce2 JB |
7679 | free_extent_map(em); |
7680 | ||
7681 | return 0; | |
eb838e73 JB |
7682 | |
7683 | unlock_err: | |
eb838e73 JB |
7684 | clear_extent_bit(&BTRFS_I(inode)->io_tree, lockstart, lockend, |
7685 | unlock_bits, 1, 0, &cached_state, GFP_NOFS); | |
9c9464cc | 7686 | err: |
50745b0a | 7687 | if (dio_data) |
7688 | current->journal_info = dio_data; | |
9c9464cc FM |
7689 | /* |
7690 | * Compensate the delalloc release we do in btrfs_direct_IO() when we | |
7691 | * write less data then expected, so that we don't underflow our inode's | |
7692 | * outstanding extents counter. | |
7693 | */ | |
7694 | if (create && dio_data) | |
7695 | adjust_dio_outstanding_extents(inode, dio_data, len); | |
7696 | ||
eb838e73 | 7697 | return ret; |
4b46fce2 JB |
7698 | } |
7699 | ||
8b110e39 MX |
7700 | static inline int submit_dio_repair_bio(struct inode *inode, struct bio *bio, |
7701 | int rw, int mirror_num) | |
7702 | { | |
7703 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
7704 | int ret; | |
7705 | ||
7706 | BUG_ON(rw & REQ_WRITE); | |
7707 | ||
7708 | bio_get(bio); | |
7709 | ||
7710 | ret = btrfs_bio_wq_end_io(root->fs_info, bio, | |
7711 | BTRFS_WQ_ENDIO_DIO_REPAIR); | |
7712 | if (ret) | |
7713 | goto err; | |
7714 | ||
7715 | ret = btrfs_map_bio(root, rw, bio, mirror_num, 0); | |
7716 | err: | |
7717 | bio_put(bio); | |
7718 | return ret; | |
7719 | } | |
7720 | ||
7721 | static int btrfs_check_dio_repairable(struct inode *inode, | |
7722 | struct bio *failed_bio, | |
7723 | struct io_failure_record *failrec, | |
7724 | int failed_mirror) | |
7725 | { | |
7726 | int num_copies; | |
7727 | ||
7728 | num_copies = btrfs_num_copies(BTRFS_I(inode)->root->fs_info, | |
7729 | failrec->logical, failrec->len); | |
7730 | if (num_copies == 1) { | |
7731 | /* | |
7732 | * we only have a single copy of the data, so don't bother with | |
7733 | * all the retry and error correction code that follows. no | |
7734 | * matter what the error is, it is very likely to persist. | |
7735 | */ | |
7736 | pr_debug("Check DIO Repairable: cannot repair, num_copies=%d, next_mirror %d, failed_mirror %d\n", | |
7737 | num_copies, failrec->this_mirror, failed_mirror); | |
7738 | return 0; | |
7739 | } | |
7740 | ||
7741 | failrec->failed_mirror = failed_mirror; | |
7742 | failrec->this_mirror++; | |
7743 | if (failrec->this_mirror == failed_mirror) | |
7744 | failrec->this_mirror++; | |
7745 | ||
7746 | if (failrec->this_mirror > num_copies) { | |
7747 | pr_debug("Check DIO Repairable: (fail) num_copies=%d, next_mirror %d, failed_mirror %d\n", | |
7748 | num_copies, failrec->this_mirror, failed_mirror); | |
7749 | return 0; | |
7750 | } | |
7751 | ||
7752 | return 1; | |
7753 | } | |
7754 | ||
7755 | static int dio_read_error(struct inode *inode, struct bio *failed_bio, | |
7756 | struct page *page, u64 start, u64 end, | |
7757 | int failed_mirror, bio_end_io_t *repair_endio, | |
7758 | void *repair_arg) | |
7759 | { | |
7760 | struct io_failure_record *failrec; | |
7761 | struct bio *bio; | |
7762 | int isector; | |
7763 | int read_mode; | |
7764 | int ret; | |
7765 | ||
7766 | BUG_ON(failed_bio->bi_rw & REQ_WRITE); | |
7767 | ||
7768 | ret = btrfs_get_io_failure_record(inode, start, end, &failrec); | |
7769 | if (ret) | |
7770 | return ret; | |
7771 | ||
7772 | ret = btrfs_check_dio_repairable(inode, failed_bio, failrec, | |
7773 | failed_mirror); | |
7774 | if (!ret) { | |
7775 | free_io_failure(inode, failrec); | |
7776 | return -EIO; | |
7777 | } | |
7778 | ||
7779 | if (failed_bio->bi_vcnt > 1) | |
7780 | read_mode = READ_SYNC | REQ_FAILFAST_DEV; | |
7781 | else | |
7782 | read_mode = READ_SYNC; | |
7783 | ||
7784 | isector = start - btrfs_io_bio(failed_bio)->logical; | |
7785 | isector >>= inode->i_sb->s_blocksize_bits; | |
7786 | bio = btrfs_create_repair_bio(inode, failed_bio, failrec, page, | |
7787 | 0, isector, repair_endio, repair_arg); | |
7788 | if (!bio) { | |
7789 | free_io_failure(inode, failrec); | |
7790 | return -EIO; | |
7791 | } | |
7792 | ||
7793 | btrfs_debug(BTRFS_I(inode)->root->fs_info, | |
7794 | "Repair DIO Read Error: submitting new dio read[%#x] to this_mirror=%d, in_validation=%d\n", | |
7795 | read_mode, failrec->this_mirror, failrec->in_validation); | |
7796 | ||
7797 | ret = submit_dio_repair_bio(inode, bio, read_mode, | |
7798 | failrec->this_mirror); | |
7799 | if (ret) { | |
7800 | free_io_failure(inode, failrec); | |
7801 | bio_put(bio); | |
7802 | } | |
7803 | ||
7804 | return ret; | |
7805 | } | |
7806 | ||
7807 | struct btrfs_retry_complete { | |
7808 | struct completion done; | |
7809 | struct inode *inode; | |
7810 | u64 start; | |
7811 | int uptodate; | |
7812 | }; | |
7813 | ||
4246a0b6 | 7814 | static void btrfs_retry_endio_nocsum(struct bio *bio) |
8b110e39 MX |
7815 | { |
7816 | struct btrfs_retry_complete *done = bio->bi_private; | |
7817 | struct bio_vec *bvec; | |
7818 | int i; | |
7819 | ||
4246a0b6 | 7820 | if (bio->bi_error) |
8b110e39 MX |
7821 | goto end; |
7822 | ||
7823 | done->uptodate = 1; | |
7824 | bio_for_each_segment_all(bvec, bio, i) | |
7825 | clean_io_failure(done->inode, done->start, bvec->bv_page, 0); | |
7826 | end: | |
7827 | complete(&done->done); | |
7828 | bio_put(bio); | |
7829 | } | |
7830 | ||
7831 | static int __btrfs_correct_data_nocsum(struct inode *inode, | |
7832 | struct btrfs_io_bio *io_bio) | |
4b46fce2 | 7833 | { |
2c30c71b | 7834 | struct bio_vec *bvec; |
8b110e39 | 7835 | struct btrfs_retry_complete done; |
4b46fce2 | 7836 | u64 start; |
2c30c71b | 7837 | int i; |
c1dc0896 | 7838 | int ret; |
4b46fce2 | 7839 | |
8b110e39 MX |
7840 | start = io_bio->logical; |
7841 | done.inode = inode; | |
7842 | ||
7843 | bio_for_each_segment_all(bvec, &io_bio->bio, i) { | |
7844 | try_again: | |
7845 | done.uptodate = 0; | |
7846 | done.start = start; | |
7847 | init_completion(&done.done); | |
7848 | ||
7849 | ret = dio_read_error(inode, &io_bio->bio, bvec->bv_page, start, | |
7850 | start + bvec->bv_len - 1, | |
7851 | io_bio->mirror_num, | |
7852 | btrfs_retry_endio_nocsum, &done); | |
7853 | if (ret) | |
7854 | return ret; | |
7855 | ||
7856 | wait_for_completion(&done.done); | |
7857 | ||
7858 | if (!done.uptodate) { | |
7859 | /* We might have another mirror, so try again */ | |
7860 | goto try_again; | |
7861 | } | |
7862 | ||
7863 | start += bvec->bv_len; | |
7864 | } | |
7865 | ||
7866 | return 0; | |
7867 | } | |
7868 | ||
4246a0b6 | 7869 | static void btrfs_retry_endio(struct bio *bio) |
8b110e39 MX |
7870 | { |
7871 | struct btrfs_retry_complete *done = bio->bi_private; | |
7872 | struct btrfs_io_bio *io_bio = btrfs_io_bio(bio); | |
7873 | struct bio_vec *bvec; | |
7874 | int uptodate; | |
7875 | int ret; | |
7876 | int i; | |
7877 | ||
4246a0b6 | 7878 | if (bio->bi_error) |
8b110e39 MX |
7879 | goto end; |
7880 | ||
7881 | uptodate = 1; | |
7882 | bio_for_each_segment_all(bvec, bio, i) { | |
7883 | ret = __readpage_endio_check(done->inode, io_bio, i, | |
7884 | bvec->bv_page, 0, | |
7885 | done->start, bvec->bv_len); | |
7886 | if (!ret) | |
7887 | clean_io_failure(done->inode, done->start, | |
7888 | bvec->bv_page, 0); | |
7889 | else | |
7890 | uptodate = 0; | |
7891 | } | |
7892 | ||
7893 | done->uptodate = uptodate; | |
7894 | end: | |
7895 | complete(&done->done); | |
7896 | bio_put(bio); | |
7897 | } | |
7898 | ||
7899 | static int __btrfs_subio_endio_read(struct inode *inode, | |
7900 | struct btrfs_io_bio *io_bio, int err) | |
7901 | { | |
7902 | struct bio_vec *bvec; | |
7903 | struct btrfs_retry_complete done; | |
7904 | u64 start; | |
7905 | u64 offset = 0; | |
7906 | int i; | |
7907 | int ret; | |
dc380aea | 7908 | |
8b110e39 | 7909 | err = 0; |
c1dc0896 | 7910 | start = io_bio->logical; |
8b110e39 MX |
7911 | done.inode = inode; |
7912 | ||
c1dc0896 | 7913 | bio_for_each_segment_all(bvec, &io_bio->bio, i) { |
dc380aea MX |
7914 | ret = __readpage_endio_check(inode, io_bio, i, bvec->bv_page, |
7915 | 0, start, bvec->bv_len); | |
8b110e39 MX |
7916 | if (likely(!ret)) |
7917 | goto next; | |
7918 | try_again: | |
7919 | done.uptodate = 0; | |
7920 | done.start = start; | |
7921 | init_completion(&done.done); | |
7922 | ||
7923 | ret = dio_read_error(inode, &io_bio->bio, bvec->bv_page, start, | |
7924 | start + bvec->bv_len - 1, | |
7925 | io_bio->mirror_num, | |
7926 | btrfs_retry_endio, &done); | |
7927 | if (ret) { | |
7928 | err = ret; | |
7929 | goto next; | |
7930 | } | |
7931 | ||
7932 | wait_for_completion(&done.done); | |
7933 | ||
7934 | if (!done.uptodate) { | |
7935 | /* We might have another mirror, so try again */ | |
7936 | goto try_again; | |
7937 | } | |
7938 | next: | |
7939 | offset += bvec->bv_len; | |
4b46fce2 | 7940 | start += bvec->bv_len; |
2c30c71b | 7941 | } |
c1dc0896 MX |
7942 | |
7943 | return err; | |
7944 | } | |
7945 | ||
8b110e39 MX |
7946 | static int btrfs_subio_endio_read(struct inode *inode, |
7947 | struct btrfs_io_bio *io_bio, int err) | |
7948 | { | |
7949 | bool skip_csum = BTRFS_I(inode)->flags & BTRFS_INODE_NODATASUM; | |
7950 | ||
7951 | if (skip_csum) { | |
7952 | if (unlikely(err)) | |
7953 | return __btrfs_correct_data_nocsum(inode, io_bio); | |
7954 | else | |
7955 | return 0; | |
7956 | } else { | |
7957 | return __btrfs_subio_endio_read(inode, io_bio, err); | |
7958 | } | |
7959 | } | |
7960 | ||
4246a0b6 | 7961 | static void btrfs_endio_direct_read(struct bio *bio) |
c1dc0896 MX |
7962 | { |
7963 | struct btrfs_dio_private *dip = bio->bi_private; | |
7964 | struct inode *inode = dip->inode; | |
7965 | struct bio *dio_bio; | |
7966 | struct btrfs_io_bio *io_bio = btrfs_io_bio(bio); | |
4246a0b6 | 7967 | int err = bio->bi_error; |
c1dc0896 | 7968 | |
8b110e39 MX |
7969 | if (dip->flags & BTRFS_DIO_ORIG_BIO_SUBMITTED) |
7970 | err = btrfs_subio_endio_read(inode, io_bio, err); | |
c1dc0896 | 7971 | |
4b46fce2 | 7972 | unlock_extent(&BTRFS_I(inode)->io_tree, dip->logical_offset, |
d0082371 | 7973 | dip->logical_offset + dip->bytes - 1); |
9be3395b | 7974 | dio_bio = dip->dio_bio; |
4b46fce2 | 7975 | |
4b46fce2 | 7976 | kfree(dip); |
c0da7aa1 | 7977 | |
4246a0b6 | 7978 | dio_end_io(dio_bio, bio->bi_error); |
23ea8e5a MX |
7979 | |
7980 | if (io_bio->end_io) | |
7981 | io_bio->end_io(io_bio, err); | |
9be3395b | 7982 | bio_put(bio); |
4b46fce2 JB |
7983 | } |
7984 | ||
14543774 FM |
7985 | static void btrfs_endio_direct_write_update_ordered(struct inode *inode, |
7986 | const u64 offset, | |
7987 | const u64 bytes, | |
7988 | const int uptodate) | |
4b46fce2 | 7989 | { |
4b46fce2 | 7990 | struct btrfs_root *root = BTRFS_I(inode)->root; |
4b46fce2 | 7991 | struct btrfs_ordered_extent *ordered = NULL; |
14543774 FM |
7992 | u64 ordered_offset = offset; |
7993 | u64 ordered_bytes = bytes; | |
4b46fce2 JB |
7994 | int ret; |
7995 | ||
163cf09c CM |
7996 | again: |
7997 | ret = btrfs_dec_test_first_ordered_pending(inode, &ordered, | |
7998 | &ordered_offset, | |
4246a0b6 | 7999 | ordered_bytes, |
14543774 | 8000 | uptodate); |
4b46fce2 | 8001 | if (!ret) |
163cf09c | 8002 | goto out_test; |
4b46fce2 | 8003 | |
9e0af237 LB |
8004 | btrfs_init_work(&ordered->work, btrfs_endio_write_helper, |
8005 | finish_ordered_fn, NULL, NULL); | |
fccb5d86 QW |
8006 | btrfs_queue_work(root->fs_info->endio_write_workers, |
8007 | &ordered->work); | |
163cf09c CM |
8008 | out_test: |
8009 | /* | |
8010 | * our bio might span multiple ordered extents. If we haven't | |
8011 | * completed the accounting for the whole dio, go back and try again | |
8012 | */ | |
14543774 FM |
8013 | if (ordered_offset < offset + bytes) { |
8014 | ordered_bytes = offset + bytes - ordered_offset; | |
5fd02043 | 8015 | ordered = NULL; |
163cf09c CM |
8016 | goto again; |
8017 | } | |
14543774 FM |
8018 | } |
8019 | ||
8020 | static void btrfs_endio_direct_write(struct bio *bio) | |
8021 | { | |
8022 | struct btrfs_dio_private *dip = bio->bi_private; | |
8023 | struct bio *dio_bio = dip->dio_bio; | |
8024 | ||
8025 | btrfs_endio_direct_write_update_ordered(dip->inode, | |
8026 | dip->logical_offset, | |
8027 | dip->bytes, | |
8028 | !bio->bi_error); | |
4b46fce2 | 8029 | |
4b46fce2 | 8030 | kfree(dip); |
c0da7aa1 | 8031 | |
4246a0b6 | 8032 | dio_end_io(dio_bio, bio->bi_error); |
9be3395b | 8033 | bio_put(bio); |
4b46fce2 JB |
8034 | } |
8035 | ||
eaf25d93 CM |
8036 | static int __btrfs_submit_bio_start_direct_io(struct inode *inode, int rw, |
8037 | struct bio *bio, int mirror_num, | |
8038 | unsigned long bio_flags, u64 offset) | |
8039 | { | |
8040 | int ret; | |
8041 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
8042 | ret = btrfs_csum_one_bio(root, inode, bio, offset, 1); | |
79787eaa | 8043 | BUG_ON(ret); /* -ENOMEM */ |
eaf25d93 CM |
8044 | return 0; |
8045 | } | |
8046 | ||
4246a0b6 | 8047 | static void btrfs_end_dio_bio(struct bio *bio) |
e65e1535 MX |
8048 | { |
8049 | struct btrfs_dio_private *dip = bio->bi_private; | |
4246a0b6 | 8050 | int err = bio->bi_error; |
e65e1535 | 8051 | |
8b110e39 MX |
8052 | if (err) |
8053 | btrfs_warn(BTRFS_I(dip->inode)->root->fs_info, | |
8054 | "direct IO failed ino %llu rw %lu sector %#Lx len %u err no %d", | |
8055 | btrfs_ino(dip->inode), bio->bi_rw, | |
8056 | (unsigned long long)bio->bi_iter.bi_sector, | |
8057 | bio->bi_iter.bi_size, err); | |
8058 | ||
8059 | if (dip->subio_endio) | |
8060 | err = dip->subio_endio(dip->inode, btrfs_io_bio(bio), err); | |
c1dc0896 MX |
8061 | |
8062 | if (err) { | |
e65e1535 MX |
8063 | dip->errors = 1; |
8064 | ||
8065 | /* | |
8066 | * before atomic variable goto zero, we must make sure | |
8067 | * dip->errors is perceived to be set. | |
8068 | */ | |
4e857c58 | 8069 | smp_mb__before_atomic(); |
e65e1535 MX |
8070 | } |
8071 | ||
8072 | /* if there are more bios still pending for this dio, just exit */ | |
8073 | if (!atomic_dec_and_test(&dip->pending_bios)) | |
8074 | goto out; | |
8075 | ||
9be3395b | 8076 | if (dip->errors) { |
e65e1535 | 8077 | bio_io_error(dip->orig_bio); |
9be3395b | 8078 | } else { |
4246a0b6 CH |
8079 | dip->dio_bio->bi_error = 0; |
8080 | bio_endio(dip->orig_bio); | |
e65e1535 MX |
8081 | } |
8082 | out: | |
8083 | bio_put(bio); | |
8084 | } | |
8085 | ||
8086 | static struct bio *btrfs_dio_bio_alloc(struct block_device *bdev, | |
8087 | u64 first_sector, gfp_t gfp_flags) | |
8088 | { | |
da2f0f74 | 8089 | struct bio *bio; |
22365979 | 8090 | bio = btrfs_bio_alloc(bdev, first_sector, BIO_MAX_PAGES, gfp_flags); |
da2f0f74 CM |
8091 | if (bio) |
8092 | bio_associate_current(bio); | |
8093 | return bio; | |
e65e1535 MX |
8094 | } |
8095 | ||
c1dc0896 MX |
8096 | static inline int btrfs_lookup_and_bind_dio_csum(struct btrfs_root *root, |
8097 | struct inode *inode, | |
8098 | struct btrfs_dio_private *dip, | |
8099 | struct bio *bio, | |
8100 | u64 file_offset) | |
8101 | { | |
8102 | struct btrfs_io_bio *io_bio = btrfs_io_bio(bio); | |
8103 | struct btrfs_io_bio *orig_io_bio = btrfs_io_bio(dip->orig_bio); | |
8104 | int ret; | |
8105 | ||
8106 | /* | |
8107 | * We load all the csum data we need when we submit | |
8108 | * the first bio to reduce the csum tree search and | |
8109 | * contention. | |
8110 | */ | |
8111 | if (dip->logical_offset == file_offset) { | |
8112 | ret = btrfs_lookup_bio_sums_dio(root, inode, dip->orig_bio, | |
8113 | file_offset); | |
8114 | if (ret) | |
8115 | return ret; | |
8116 | } | |
8117 | ||
8118 | if (bio == dip->orig_bio) | |
8119 | return 0; | |
8120 | ||
8121 | file_offset -= dip->logical_offset; | |
8122 | file_offset >>= inode->i_sb->s_blocksize_bits; | |
8123 | io_bio->csum = (u8 *)(((u32 *)orig_io_bio->csum) + file_offset); | |
8124 | ||
8125 | return 0; | |
8126 | } | |
8127 | ||
e65e1535 MX |
8128 | static inline int __btrfs_submit_dio_bio(struct bio *bio, struct inode *inode, |
8129 | int rw, u64 file_offset, int skip_sum, | |
c329861d | 8130 | int async_submit) |
e65e1535 | 8131 | { |
facc8a22 | 8132 | struct btrfs_dio_private *dip = bio->bi_private; |
e65e1535 MX |
8133 | int write = rw & REQ_WRITE; |
8134 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
8135 | int ret; | |
8136 | ||
b812ce28 JB |
8137 | if (async_submit) |
8138 | async_submit = !atomic_read(&BTRFS_I(inode)->sync_writers); | |
8139 | ||
e65e1535 | 8140 | bio_get(bio); |
5fd02043 JB |
8141 | |
8142 | if (!write) { | |
bfebd8b5 DS |
8143 | ret = btrfs_bio_wq_end_io(root->fs_info, bio, |
8144 | BTRFS_WQ_ENDIO_DATA); | |
5fd02043 JB |
8145 | if (ret) |
8146 | goto err; | |
8147 | } | |
e65e1535 | 8148 | |
1ae39938 JB |
8149 | if (skip_sum) |
8150 | goto map; | |
8151 | ||
8152 | if (write && async_submit) { | |
e65e1535 MX |
8153 | ret = btrfs_wq_submit_bio(root->fs_info, |
8154 | inode, rw, bio, 0, 0, | |
8155 | file_offset, | |
8156 | __btrfs_submit_bio_start_direct_io, | |
8157 | __btrfs_submit_bio_done); | |
8158 | goto err; | |
1ae39938 JB |
8159 | } else if (write) { |
8160 | /* | |
8161 | * If we aren't doing async submit, calculate the csum of the | |
8162 | * bio now. | |
8163 | */ | |
8164 | ret = btrfs_csum_one_bio(root, inode, bio, file_offset, 1); | |
8165 | if (ret) | |
8166 | goto err; | |
23ea8e5a | 8167 | } else { |
c1dc0896 MX |
8168 | ret = btrfs_lookup_and_bind_dio_csum(root, inode, dip, bio, |
8169 | file_offset); | |
c2db1073 TI |
8170 | if (ret) |
8171 | goto err; | |
8172 | } | |
1ae39938 JB |
8173 | map: |
8174 | ret = btrfs_map_bio(root, rw, bio, 0, async_submit); | |
e65e1535 MX |
8175 | err: |
8176 | bio_put(bio); | |
8177 | return ret; | |
8178 | } | |
8179 | ||
8180 | static int btrfs_submit_direct_hook(int rw, struct btrfs_dio_private *dip, | |
8181 | int skip_sum) | |
8182 | { | |
8183 | struct inode *inode = dip->inode; | |
8184 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
e65e1535 MX |
8185 | struct bio *bio; |
8186 | struct bio *orig_bio = dip->orig_bio; | |
8187 | struct bio_vec *bvec = orig_bio->bi_io_vec; | |
4f024f37 | 8188 | u64 start_sector = orig_bio->bi_iter.bi_sector; |
e65e1535 MX |
8189 | u64 file_offset = dip->logical_offset; |
8190 | u64 submit_len = 0; | |
8191 | u64 map_length; | |
8192 | int nr_pages = 0; | |
23ea8e5a | 8193 | int ret; |
1ae39938 | 8194 | int async_submit = 0; |
e65e1535 | 8195 | |
4f024f37 | 8196 | map_length = orig_bio->bi_iter.bi_size; |
53b381b3 | 8197 | ret = btrfs_map_block(root->fs_info, rw, start_sector << 9, |
e65e1535 | 8198 | &map_length, NULL, 0); |
7a5c3c9b | 8199 | if (ret) |
e65e1535 | 8200 | return -EIO; |
facc8a22 | 8201 | |
4f024f37 | 8202 | if (map_length >= orig_bio->bi_iter.bi_size) { |
02f57c7a | 8203 | bio = orig_bio; |
c1dc0896 | 8204 | dip->flags |= BTRFS_DIO_ORIG_BIO_SUBMITTED; |
02f57c7a JB |
8205 | goto submit; |
8206 | } | |
8207 | ||
53b381b3 | 8208 | /* async crcs make it difficult to collect full stripe writes. */ |
ffe2d203 | 8209 | if (btrfs_get_alloc_profile(root, 1) & BTRFS_BLOCK_GROUP_RAID56_MASK) |
53b381b3 DW |
8210 | async_submit = 0; |
8211 | else | |
8212 | async_submit = 1; | |
8213 | ||
02f57c7a JB |
8214 | bio = btrfs_dio_bio_alloc(orig_bio->bi_bdev, start_sector, GFP_NOFS); |
8215 | if (!bio) | |
8216 | return -ENOMEM; | |
7a5c3c9b | 8217 | |
02f57c7a JB |
8218 | bio->bi_private = dip; |
8219 | bio->bi_end_io = btrfs_end_dio_bio; | |
c1dc0896 | 8220 | btrfs_io_bio(bio)->logical = file_offset; |
02f57c7a JB |
8221 | atomic_inc(&dip->pending_bios); |
8222 | ||
e65e1535 | 8223 | while (bvec <= (orig_bio->bi_io_vec + orig_bio->bi_vcnt - 1)) { |
ee39b432 | 8224 | if (map_length < submit_len + bvec->bv_len || |
e65e1535 | 8225 | bio_add_page(bio, bvec->bv_page, bvec->bv_len, |
ee39b432 | 8226 | bvec->bv_offset) < bvec->bv_len) { |
e65e1535 MX |
8227 | /* |
8228 | * inc the count before we submit the bio so | |
8229 | * we know the end IO handler won't happen before | |
8230 | * we inc the count. Otherwise, the dip might get freed | |
8231 | * before we're done setting it up | |
8232 | */ | |
8233 | atomic_inc(&dip->pending_bios); | |
8234 | ret = __btrfs_submit_dio_bio(bio, inode, rw, | |
8235 | file_offset, skip_sum, | |
c329861d | 8236 | async_submit); |
e65e1535 MX |
8237 | if (ret) { |
8238 | bio_put(bio); | |
8239 | atomic_dec(&dip->pending_bios); | |
8240 | goto out_err; | |
8241 | } | |
8242 | ||
e65e1535 MX |
8243 | start_sector += submit_len >> 9; |
8244 | file_offset += submit_len; | |
8245 | ||
8246 | submit_len = 0; | |
8247 | nr_pages = 0; | |
8248 | ||
8249 | bio = btrfs_dio_bio_alloc(orig_bio->bi_bdev, | |
8250 | start_sector, GFP_NOFS); | |
8251 | if (!bio) | |
8252 | goto out_err; | |
8253 | bio->bi_private = dip; | |
8254 | bio->bi_end_io = btrfs_end_dio_bio; | |
c1dc0896 | 8255 | btrfs_io_bio(bio)->logical = file_offset; |
e65e1535 | 8256 | |
4f024f37 | 8257 | map_length = orig_bio->bi_iter.bi_size; |
53b381b3 | 8258 | ret = btrfs_map_block(root->fs_info, rw, |
3ec706c8 | 8259 | start_sector << 9, |
e65e1535 MX |
8260 | &map_length, NULL, 0); |
8261 | if (ret) { | |
8262 | bio_put(bio); | |
8263 | goto out_err; | |
8264 | } | |
8265 | } else { | |
8266 | submit_len += bvec->bv_len; | |
67871254 | 8267 | nr_pages++; |
e65e1535 MX |
8268 | bvec++; |
8269 | } | |
8270 | } | |
8271 | ||
02f57c7a | 8272 | submit: |
e65e1535 | 8273 | ret = __btrfs_submit_dio_bio(bio, inode, rw, file_offset, skip_sum, |
c329861d | 8274 | async_submit); |
e65e1535 MX |
8275 | if (!ret) |
8276 | return 0; | |
8277 | ||
8278 | bio_put(bio); | |
8279 | out_err: | |
8280 | dip->errors = 1; | |
8281 | /* | |
8282 | * before atomic variable goto zero, we must | |
8283 | * make sure dip->errors is perceived to be set. | |
8284 | */ | |
4e857c58 | 8285 | smp_mb__before_atomic(); |
e65e1535 MX |
8286 | if (atomic_dec_and_test(&dip->pending_bios)) |
8287 | bio_io_error(dip->orig_bio); | |
8288 | ||
8289 | /* bio_end_io() will handle error, so we needn't return it */ | |
8290 | return 0; | |
8291 | } | |
8292 | ||
9be3395b CM |
8293 | static void btrfs_submit_direct(int rw, struct bio *dio_bio, |
8294 | struct inode *inode, loff_t file_offset) | |
4b46fce2 | 8295 | { |
61de718f FM |
8296 | struct btrfs_dio_private *dip = NULL; |
8297 | struct bio *io_bio = NULL; | |
23ea8e5a | 8298 | struct btrfs_io_bio *btrfs_bio; |
4b46fce2 | 8299 | int skip_sum; |
7b6d91da | 8300 | int write = rw & REQ_WRITE; |
4b46fce2 JB |
8301 | int ret = 0; |
8302 | ||
8303 | skip_sum = BTRFS_I(inode)->flags & BTRFS_INODE_NODATASUM; | |
8304 | ||
9be3395b | 8305 | io_bio = btrfs_bio_clone(dio_bio, GFP_NOFS); |
9be3395b CM |
8306 | if (!io_bio) { |
8307 | ret = -ENOMEM; | |
8308 | goto free_ordered; | |
8309 | } | |
8310 | ||
c1dc0896 | 8311 | dip = kzalloc(sizeof(*dip), GFP_NOFS); |
4b46fce2 JB |
8312 | if (!dip) { |
8313 | ret = -ENOMEM; | |
61de718f | 8314 | goto free_ordered; |
4b46fce2 | 8315 | } |
4b46fce2 | 8316 | |
9be3395b | 8317 | dip->private = dio_bio->bi_private; |
4b46fce2 JB |
8318 | dip->inode = inode; |
8319 | dip->logical_offset = file_offset; | |
4f024f37 KO |
8320 | dip->bytes = dio_bio->bi_iter.bi_size; |
8321 | dip->disk_bytenr = (u64)dio_bio->bi_iter.bi_sector << 9; | |
9be3395b | 8322 | io_bio->bi_private = dip; |
9be3395b CM |
8323 | dip->orig_bio = io_bio; |
8324 | dip->dio_bio = dio_bio; | |
e65e1535 | 8325 | atomic_set(&dip->pending_bios, 0); |
c1dc0896 MX |
8326 | btrfs_bio = btrfs_io_bio(io_bio); |
8327 | btrfs_bio->logical = file_offset; | |
4b46fce2 | 8328 | |
c1dc0896 | 8329 | if (write) { |
9be3395b | 8330 | io_bio->bi_end_io = btrfs_endio_direct_write; |
c1dc0896 | 8331 | } else { |
9be3395b | 8332 | io_bio->bi_end_io = btrfs_endio_direct_read; |
c1dc0896 MX |
8333 | dip->subio_endio = btrfs_subio_endio_read; |
8334 | } | |
4b46fce2 | 8335 | |
f28a4928 FM |
8336 | /* |
8337 | * Reset the range for unsubmitted ordered extents (to a 0 length range) | |
8338 | * even if we fail to submit a bio, because in such case we do the | |
8339 | * corresponding error handling below and it must not be done a second | |
8340 | * time by btrfs_direct_IO(). | |
8341 | */ | |
8342 | if (write) { | |
8343 | struct btrfs_dio_data *dio_data = current->journal_info; | |
8344 | ||
8345 | dio_data->unsubmitted_oe_range_end = dip->logical_offset + | |
8346 | dip->bytes; | |
8347 | dio_data->unsubmitted_oe_range_start = | |
8348 | dio_data->unsubmitted_oe_range_end; | |
8349 | } | |
8350 | ||
e65e1535 MX |
8351 | ret = btrfs_submit_direct_hook(rw, dip, skip_sum); |
8352 | if (!ret) | |
eaf25d93 | 8353 | return; |
9be3395b | 8354 | |
23ea8e5a MX |
8355 | if (btrfs_bio->end_io) |
8356 | btrfs_bio->end_io(btrfs_bio, ret); | |
9be3395b | 8357 | |
4b46fce2 JB |
8358 | free_ordered: |
8359 | /* | |
61de718f FM |
8360 | * If we arrived here it means either we failed to submit the dip |
8361 | * or we either failed to clone the dio_bio or failed to allocate the | |
8362 | * dip. If we cloned the dio_bio and allocated the dip, we can just | |
8363 | * call bio_endio against our io_bio so that we get proper resource | |
8364 | * cleanup if we fail to submit the dip, otherwise, we must do the | |
8365 | * same as btrfs_endio_direct_[write|read] because we can't call these | |
8366 | * callbacks - they require an allocated dip and a clone of dio_bio. | |
4b46fce2 | 8367 | */ |
61de718f | 8368 | if (io_bio && dip) { |
4246a0b6 CH |
8369 | io_bio->bi_error = -EIO; |
8370 | bio_endio(io_bio); | |
61de718f FM |
8371 | /* |
8372 | * The end io callbacks free our dip, do the final put on io_bio | |
8373 | * and all the cleanup and final put for dio_bio (through | |
8374 | * dio_end_io()). | |
8375 | */ | |
8376 | dip = NULL; | |
8377 | io_bio = NULL; | |
8378 | } else { | |
14543774 FM |
8379 | if (write) |
8380 | btrfs_endio_direct_write_update_ordered(inode, | |
8381 | file_offset, | |
8382 | dio_bio->bi_iter.bi_size, | |
8383 | 0); | |
8384 | else | |
61de718f FM |
8385 | unlock_extent(&BTRFS_I(inode)->io_tree, file_offset, |
8386 | file_offset + dio_bio->bi_iter.bi_size - 1); | |
14543774 | 8387 | |
4246a0b6 | 8388 | dio_bio->bi_error = -EIO; |
61de718f FM |
8389 | /* |
8390 | * Releases and cleans up our dio_bio, no need to bio_put() | |
8391 | * nor bio_endio()/bio_io_error() against dio_bio. | |
8392 | */ | |
8393 | dio_end_io(dio_bio, ret); | |
4b46fce2 | 8394 | } |
61de718f FM |
8395 | if (io_bio) |
8396 | bio_put(io_bio); | |
8397 | kfree(dip); | |
4b46fce2 JB |
8398 | } |
8399 | ||
6f673763 | 8400 | static ssize_t check_direct_IO(struct btrfs_root *root, struct kiocb *iocb, |
28060d5d | 8401 | const struct iov_iter *iter, loff_t offset) |
5a5f79b5 CM |
8402 | { |
8403 | int seg; | |
a1b75f7d | 8404 | int i; |
5a5f79b5 CM |
8405 | unsigned blocksize_mask = root->sectorsize - 1; |
8406 | ssize_t retval = -EINVAL; | |
5a5f79b5 CM |
8407 | |
8408 | if (offset & blocksize_mask) | |
8409 | goto out; | |
8410 | ||
28060d5d AV |
8411 | if (iov_iter_alignment(iter) & blocksize_mask) |
8412 | goto out; | |
a1b75f7d | 8413 | |
28060d5d | 8414 | /* If this is a write we don't need to check anymore */ |
6f673763 | 8415 | if (iov_iter_rw(iter) == WRITE) |
28060d5d AV |
8416 | return 0; |
8417 | /* | |
8418 | * Check to make sure we don't have duplicate iov_base's in this | |
8419 | * iovec, if so return EINVAL, otherwise we'll get csum errors | |
8420 | * when reading back. | |
8421 | */ | |
8422 | for (seg = 0; seg < iter->nr_segs; seg++) { | |
8423 | for (i = seg + 1; i < iter->nr_segs; i++) { | |
8424 | if (iter->iov[seg].iov_base == iter->iov[i].iov_base) | |
a1b75f7d JB |
8425 | goto out; |
8426 | } | |
5a5f79b5 CM |
8427 | } |
8428 | retval = 0; | |
8429 | out: | |
8430 | return retval; | |
8431 | } | |
eb838e73 | 8432 | |
22c6186e OS |
8433 | static ssize_t btrfs_direct_IO(struct kiocb *iocb, struct iov_iter *iter, |
8434 | loff_t offset) | |
16432985 | 8435 | { |
4b46fce2 JB |
8436 | struct file *file = iocb->ki_filp; |
8437 | struct inode *inode = file->f_mapping->host; | |
50745b0a | 8438 | struct btrfs_root *root = BTRFS_I(inode)->root; |
8439 | struct btrfs_dio_data dio_data = { 0 }; | |
0934856d | 8440 | size_t count = 0; |
2e60a51e | 8441 | int flags = 0; |
38851cc1 MX |
8442 | bool wakeup = true; |
8443 | bool relock = false; | |
0934856d | 8444 | ssize_t ret; |
4b46fce2 | 8445 | |
6f673763 | 8446 | if (check_direct_IO(BTRFS_I(inode)->root, iocb, iter, offset)) |
5a5f79b5 | 8447 | return 0; |
3f7c579c | 8448 | |
fe0f07d0 | 8449 | inode_dio_begin(inode); |
4e857c58 | 8450 | smp_mb__after_atomic(); |
38851cc1 | 8451 | |
0e267c44 | 8452 | /* |
41bd9ca4 MX |
8453 | * The generic stuff only does filemap_write_and_wait_range, which |
8454 | * isn't enough if we've written compressed pages to this area, so | |
8455 | * we need to flush the dirty pages again to make absolutely sure | |
8456 | * that any outstanding dirty pages are on disk. | |
0e267c44 | 8457 | */ |
a6cbcd4a | 8458 | count = iov_iter_count(iter); |
41bd9ca4 MX |
8459 | if (test_bit(BTRFS_INODE_HAS_ASYNC_EXTENT, |
8460 | &BTRFS_I(inode)->runtime_flags)) | |
9a025a08 WS |
8461 | filemap_fdatawrite_range(inode->i_mapping, offset, |
8462 | offset + count - 1); | |
0e267c44 | 8463 | |
6f673763 | 8464 | if (iov_iter_rw(iter) == WRITE) { |
38851cc1 MX |
8465 | /* |
8466 | * If the write DIO is beyond the EOF, we need update | |
8467 | * the isize, but it is protected by i_mutex. So we can | |
8468 | * not unlock the i_mutex at this case. | |
8469 | */ | |
8470 | if (offset + count <= inode->i_size) { | |
8471 | mutex_unlock(&inode->i_mutex); | |
8472 | relock = true; | |
8473 | } | |
7cf5b976 | 8474 | ret = btrfs_delalloc_reserve_space(inode, offset, count); |
0934856d | 8475 | if (ret) |
38851cc1 | 8476 | goto out; |
50745b0a | 8477 | dio_data.outstanding_extents = div64_u64(count + |
e1cbbfa5 JB |
8478 | BTRFS_MAX_EXTENT_SIZE - 1, |
8479 | BTRFS_MAX_EXTENT_SIZE); | |
8480 | ||
8481 | /* | |
8482 | * We need to know how many extents we reserved so that we can | |
8483 | * do the accounting properly if we go over the number we | |
8484 | * originally calculated. Abuse current->journal_info for this. | |
8485 | */ | |
50745b0a | 8486 | dio_data.reserve = round_up(count, root->sectorsize); |
f28a4928 FM |
8487 | dio_data.unsubmitted_oe_range_start = (u64)offset; |
8488 | dio_data.unsubmitted_oe_range_end = (u64)offset; | |
50745b0a | 8489 | current->journal_info = &dio_data; |
ee39b432 DS |
8490 | } else if (test_bit(BTRFS_INODE_READDIO_NEED_LOCK, |
8491 | &BTRFS_I(inode)->runtime_flags)) { | |
fe0f07d0 | 8492 | inode_dio_end(inode); |
38851cc1 MX |
8493 | flags = DIO_LOCKING | DIO_SKIP_HOLES; |
8494 | wakeup = false; | |
0934856d MX |
8495 | } |
8496 | ||
17f8c842 OS |
8497 | ret = __blockdev_direct_IO(iocb, inode, |
8498 | BTRFS_I(inode)->root->fs_info->fs_devices->latest_bdev, | |
8499 | iter, offset, btrfs_get_blocks_direct, NULL, | |
8500 | btrfs_submit_direct, flags); | |
6f673763 | 8501 | if (iov_iter_rw(iter) == WRITE) { |
e1cbbfa5 | 8502 | current->journal_info = NULL; |
ddba1bfc | 8503 | if (ret < 0 && ret != -EIOCBQUEUED) { |
50745b0a | 8504 | if (dio_data.reserve) |
7cf5b976 QW |
8505 | btrfs_delalloc_release_space(inode, offset, |
8506 | dio_data.reserve); | |
f28a4928 FM |
8507 | /* |
8508 | * On error we might have left some ordered extents | |
8509 | * without submitting corresponding bios for them, so | |
8510 | * cleanup them up to avoid other tasks getting them | |
8511 | * and waiting for them to complete forever. | |
8512 | */ | |
8513 | if (dio_data.unsubmitted_oe_range_start < | |
8514 | dio_data.unsubmitted_oe_range_end) | |
8515 | btrfs_endio_direct_write_update_ordered(inode, | |
8516 | dio_data.unsubmitted_oe_range_start, | |
8517 | dio_data.unsubmitted_oe_range_end - | |
8518 | dio_data.unsubmitted_oe_range_start, | |
8519 | 0); | |
ddba1bfc | 8520 | } else if (ret >= 0 && (size_t)ret < count) |
7cf5b976 QW |
8521 | btrfs_delalloc_release_space(inode, offset, |
8522 | count - (size_t)ret); | |
0934856d | 8523 | } |
38851cc1 | 8524 | out: |
2e60a51e | 8525 | if (wakeup) |
fe0f07d0 | 8526 | inode_dio_end(inode); |
38851cc1 MX |
8527 | if (relock) |
8528 | mutex_lock(&inode->i_mutex); | |
0934856d MX |
8529 | |
8530 | return ret; | |
16432985 CM |
8531 | } |
8532 | ||
05dadc09 TI |
8533 | #define BTRFS_FIEMAP_FLAGS (FIEMAP_FLAG_SYNC) |
8534 | ||
1506fcc8 YS |
8535 | static int btrfs_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, |
8536 | __u64 start, __u64 len) | |
8537 | { | |
05dadc09 TI |
8538 | int ret; |
8539 | ||
8540 | ret = fiemap_check_flags(fieinfo, BTRFS_FIEMAP_FLAGS); | |
8541 | if (ret) | |
8542 | return ret; | |
8543 | ||
ec29ed5b | 8544 | return extent_fiemap(inode, fieinfo, start, len, btrfs_get_extent_fiemap); |
1506fcc8 YS |
8545 | } |
8546 | ||
a52d9a80 | 8547 | int btrfs_readpage(struct file *file, struct page *page) |
9ebefb18 | 8548 | { |
d1310b2e CM |
8549 | struct extent_io_tree *tree; |
8550 | tree = &BTRFS_I(page->mapping->host)->io_tree; | |
8ddc7d9c | 8551 | return extent_read_full_page(tree, page, btrfs_get_extent, 0); |
9ebefb18 | 8552 | } |
1832a6d5 | 8553 | |
a52d9a80 | 8554 | static int btrfs_writepage(struct page *page, struct writeback_control *wbc) |
39279cc3 | 8555 | { |
d1310b2e | 8556 | struct extent_io_tree *tree; |
be7bd730 JB |
8557 | struct inode *inode = page->mapping->host; |
8558 | int ret; | |
b888db2b CM |
8559 | |
8560 | if (current->flags & PF_MEMALLOC) { | |
8561 | redirty_page_for_writepage(wbc, page); | |
8562 | unlock_page(page); | |
8563 | return 0; | |
8564 | } | |
be7bd730 JB |
8565 | |
8566 | /* | |
8567 | * If we are under memory pressure we will call this directly from the | |
8568 | * VM, we need to make sure we have the inode referenced for the ordered | |
8569 | * extent. If not just return like we didn't do anything. | |
8570 | */ | |
8571 | if (!igrab(inode)) { | |
8572 | redirty_page_for_writepage(wbc, page); | |
8573 | return AOP_WRITEPAGE_ACTIVATE; | |
8574 | } | |
d1310b2e | 8575 | tree = &BTRFS_I(page->mapping->host)->io_tree; |
be7bd730 JB |
8576 | ret = extent_write_full_page(tree, page, btrfs_get_extent, wbc); |
8577 | btrfs_add_delayed_iput(inode); | |
8578 | return ret; | |
9ebefb18 CM |
8579 | } |
8580 | ||
48a3b636 ES |
8581 | static int btrfs_writepages(struct address_space *mapping, |
8582 | struct writeback_control *wbc) | |
b293f02e | 8583 | { |
d1310b2e | 8584 | struct extent_io_tree *tree; |
771ed689 | 8585 | |
d1310b2e | 8586 | tree = &BTRFS_I(mapping->host)->io_tree; |
b293f02e CM |
8587 | return extent_writepages(tree, mapping, btrfs_get_extent, wbc); |
8588 | } | |
8589 | ||
3ab2fb5a CM |
8590 | static int |
8591 | btrfs_readpages(struct file *file, struct address_space *mapping, | |
8592 | struct list_head *pages, unsigned nr_pages) | |
8593 | { | |
d1310b2e CM |
8594 | struct extent_io_tree *tree; |
8595 | tree = &BTRFS_I(mapping->host)->io_tree; | |
3ab2fb5a CM |
8596 | return extent_readpages(tree, mapping, pages, nr_pages, |
8597 | btrfs_get_extent); | |
8598 | } | |
e6dcd2dc | 8599 | static int __btrfs_releasepage(struct page *page, gfp_t gfp_flags) |
9ebefb18 | 8600 | { |
d1310b2e CM |
8601 | struct extent_io_tree *tree; |
8602 | struct extent_map_tree *map; | |
a52d9a80 | 8603 | int ret; |
8c2383c3 | 8604 | |
d1310b2e CM |
8605 | tree = &BTRFS_I(page->mapping->host)->io_tree; |
8606 | map = &BTRFS_I(page->mapping->host)->extent_tree; | |
70dec807 | 8607 | ret = try_release_extent_mapping(map, tree, page, gfp_flags); |
a52d9a80 CM |
8608 | if (ret == 1) { |
8609 | ClearPagePrivate(page); | |
8610 | set_page_private(page, 0); | |
8611 | page_cache_release(page); | |
39279cc3 | 8612 | } |
a52d9a80 | 8613 | return ret; |
39279cc3 CM |
8614 | } |
8615 | ||
e6dcd2dc CM |
8616 | static int btrfs_releasepage(struct page *page, gfp_t gfp_flags) |
8617 | { | |
98509cfc CM |
8618 | if (PageWriteback(page) || PageDirty(page)) |
8619 | return 0; | |
b335b003 | 8620 | return __btrfs_releasepage(page, gfp_flags & GFP_NOFS); |
e6dcd2dc CM |
8621 | } |
8622 | ||
d47992f8 LC |
8623 | static void btrfs_invalidatepage(struct page *page, unsigned int offset, |
8624 | unsigned int length) | |
39279cc3 | 8625 | { |
5fd02043 | 8626 | struct inode *inode = page->mapping->host; |
d1310b2e | 8627 | struct extent_io_tree *tree; |
e6dcd2dc | 8628 | struct btrfs_ordered_extent *ordered; |
2ac55d41 | 8629 | struct extent_state *cached_state = NULL; |
e6dcd2dc CM |
8630 | u64 page_start = page_offset(page); |
8631 | u64 page_end = page_start + PAGE_CACHE_SIZE - 1; | |
131e404a | 8632 | int inode_evicting = inode->i_state & I_FREEING; |
39279cc3 | 8633 | |
8b62b72b CM |
8634 | /* |
8635 | * we have the page locked, so new writeback can't start, | |
8636 | * and the dirty bit won't be cleared while we are here. | |
8637 | * | |
8638 | * Wait for IO on this page so that we can safely clear | |
8639 | * the PagePrivate2 bit and do ordered accounting | |
8640 | */ | |
e6dcd2dc | 8641 | wait_on_page_writeback(page); |
8b62b72b | 8642 | |
5fd02043 | 8643 | tree = &BTRFS_I(inode)->io_tree; |
e6dcd2dc CM |
8644 | if (offset) { |
8645 | btrfs_releasepage(page, GFP_NOFS); | |
8646 | return; | |
8647 | } | |
131e404a FDBM |
8648 | |
8649 | if (!inode_evicting) | |
ff13db41 | 8650 | lock_extent_bits(tree, page_start, page_end, &cached_state); |
131e404a | 8651 | ordered = btrfs_lookup_ordered_extent(inode, page_start); |
e6dcd2dc | 8652 | if (ordered) { |
eb84ae03 CM |
8653 | /* |
8654 | * IO on this page will never be started, so we need | |
8655 | * to account for any ordered extents now | |
8656 | */ | |
131e404a FDBM |
8657 | if (!inode_evicting) |
8658 | clear_extent_bit(tree, page_start, page_end, | |
8659 | EXTENT_DIRTY | EXTENT_DELALLOC | | |
8660 | EXTENT_LOCKED | EXTENT_DO_ACCOUNTING | | |
8661 | EXTENT_DEFRAG, 1, 0, &cached_state, | |
8662 | GFP_NOFS); | |
8b62b72b CM |
8663 | /* |
8664 | * whoever cleared the private bit is responsible | |
8665 | * for the finish_ordered_io | |
8666 | */ | |
77cef2ec JB |
8667 | if (TestClearPagePrivate2(page)) { |
8668 | struct btrfs_ordered_inode_tree *tree; | |
8669 | u64 new_len; | |
8670 | ||
8671 | tree = &BTRFS_I(inode)->ordered_tree; | |
8672 | ||
8673 | spin_lock_irq(&tree->lock); | |
8674 | set_bit(BTRFS_ORDERED_TRUNCATED, &ordered->flags); | |
8675 | new_len = page_start - ordered->file_offset; | |
8676 | if (new_len < ordered->truncated_len) | |
8677 | ordered->truncated_len = new_len; | |
8678 | spin_unlock_irq(&tree->lock); | |
8679 | ||
8680 | if (btrfs_dec_test_ordered_pending(inode, &ordered, | |
8681 | page_start, | |
8682 | PAGE_CACHE_SIZE, 1)) | |
8683 | btrfs_finish_ordered_io(ordered); | |
8b62b72b | 8684 | } |
e6dcd2dc | 8685 | btrfs_put_ordered_extent(ordered); |
131e404a FDBM |
8686 | if (!inode_evicting) { |
8687 | cached_state = NULL; | |
ff13db41 | 8688 | lock_extent_bits(tree, page_start, page_end, |
131e404a FDBM |
8689 | &cached_state); |
8690 | } | |
8691 | } | |
8692 | ||
b9d0b389 QW |
8693 | /* |
8694 | * Qgroup reserved space handler | |
8695 | * Page here will be either | |
8696 | * 1) Already written to disk | |
8697 | * In this case, its reserved space is released from data rsv map | |
8698 | * and will be freed by delayed_ref handler finally. | |
8699 | * So even we call qgroup_free_data(), it won't decrease reserved | |
8700 | * space. | |
8701 | * 2) Not written to disk | |
8702 | * This means the reserved space should be freed here. | |
8703 | */ | |
8704 | btrfs_qgroup_free_data(inode, page_start, PAGE_CACHE_SIZE); | |
131e404a FDBM |
8705 | if (!inode_evicting) { |
8706 | clear_extent_bit(tree, page_start, page_end, | |
8707 | EXTENT_LOCKED | EXTENT_DIRTY | | |
8708 | EXTENT_DELALLOC | EXTENT_DO_ACCOUNTING | | |
8709 | EXTENT_DEFRAG, 1, 1, | |
8710 | &cached_state, GFP_NOFS); | |
8711 | ||
8712 | __btrfs_releasepage(page, GFP_NOFS); | |
e6dcd2dc | 8713 | } |
e6dcd2dc | 8714 | |
4a096752 | 8715 | ClearPageChecked(page); |
9ad6b7bc | 8716 | if (PagePrivate(page)) { |
9ad6b7bc CM |
8717 | ClearPagePrivate(page); |
8718 | set_page_private(page, 0); | |
8719 | page_cache_release(page); | |
8720 | } | |
39279cc3 CM |
8721 | } |
8722 | ||
9ebefb18 CM |
8723 | /* |
8724 | * btrfs_page_mkwrite() is not allowed to change the file size as it gets | |
8725 | * called from a page fault handler when a page is first dirtied. Hence we must | |
8726 | * be careful to check for EOF conditions here. We set the page up correctly | |
8727 | * for a written page which means we get ENOSPC checking when writing into | |
8728 | * holes and correct delalloc and unwritten extent mapping on filesystems that | |
8729 | * support these features. | |
8730 | * | |
8731 | * We are not allowed to take the i_mutex here so we have to play games to | |
8732 | * protect against truncate races as the page could now be beyond EOF. Because | |
8733 | * vmtruncate() writes the inode size before removing pages, once we have the | |
8734 | * page lock we can determine safely if the page is beyond EOF. If it is not | |
8735 | * beyond EOF, then the page is guaranteed safe against truncation until we | |
8736 | * unlock the page. | |
8737 | */ | |
c2ec175c | 8738 | int btrfs_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf) |
9ebefb18 | 8739 | { |
c2ec175c | 8740 | struct page *page = vmf->page; |
496ad9aa | 8741 | struct inode *inode = file_inode(vma->vm_file); |
1832a6d5 | 8742 | struct btrfs_root *root = BTRFS_I(inode)->root; |
e6dcd2dc CM |
8743 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; |
8744 | struct btrfs_ordered_extent *ordered; | |
2ac55d41 | 8745 | struct extent_state *cached_state = NULL; |
e6dcd2dc CM |
8746 | char *kaddr; |
8747 | unsigned long zero_start; | |
9ebefb18 | 8748 | loff_t size; |
1832a6d5 | 8749 | int ret; |
9998eb70 | 8750 | int reserved = 0; |
a52d9a80 | 8751 | u64 page_start; |
e6dcd2dc | 8752 | u64 page_end; |
9ebefb18 | 8753 | |
b2b5ef5c | 8754 | sb_start_pagefault(inode->i_sb); |
df480633 QW |
8755 | page_start = page_offset(page); |
8756 | page_end = page_start + PAGE_CACHE_SIZE - 1; | |
8757 | ||
7cf5b976 QW |
8758 | ret = btrfs_delalloc_reserve_space(inode, page_start, |
8759 | PAGE_CACHE_SIZE); | |
9998eb70 | 8760 | if (!ret) { |
e41f941a | 8761 | ret = file_update_time(vma->vm_file); |
9998eb70 CM |
8762 | reserved = 1; |
8763 | } | |
56a76f82 NP |
8764 | if (ret) { |
8765 | if (ret == -ENOMEM) | |
8766 | ret = VM_FAULT_OOM; | |
8767 | else /* -ENOSPC, -EIO, etc */ | |
8768 | ret = VM_FAULT_SIGBUS; | |
9998eb70 CM |
8769 | if (reserved) |
8770 | goto out; | |
8771 | goto out_noreserve; | |
56a76f82 | 8772 | } |
1832a6d5 | 8773 | |
56a76f82 | 8774 | ret = VM_FAULT_NOPAGE; /* make the VM retry the fault */ |
e6dcd2dc | 8775 | again: |
9ebefb18 | 8776 | lock_page(page); |
9ebefb18 | 8777 | size = i_size_read(inode); |
a52d9a80 | 8778 | |
9ebefb18 | 8779 | if ((page->mapping != inode->i_mapping) || |
e6dcd2dc | 8780 | (page_start >= size)) { |
9ebefb18 CM |
8781 | /* page got truncated out from underneath us */ |
8782 | goto out_unlock; | |
8783 | } | |
e6dcd2dc CM |
8784 | wait_on_page_writeback(page); |
8785 | ||
ff13db41 | 8786 | lock_extent_bits(io_tree, page_start, page_end, &cached_state); |
e6dcd2dc CM |
8787 | set_page_extent_mapped(page); |
8788 | ||
eb84ae03 CM |
8789 | /* |
8790 | * we can't set the delalloc bits if there are pending ordered | |
8791 | * extents. Drop our locks and wait for them to finish | |
8792 | */ | |
e6dcd2dc CM |
8793 | ordered = btrfs_lookup_ordered_extent(inode, page_start); |
8794 | if (ordered) { | |
2ac55d41 JB |
8795 | unlock_extent_cached(io_tree, page_start, page_end, |
8796 | &cached_state, GFP_NOFS); | |
e6dcd2dc | 8797 | unlock_page(page); |
eb84ae03 | 8798 | btrfs_start_ordered_extent(inode, ordered, 1); |
e6dcd2dc CM |
8799 | btrfs_put_ordered_extent(ordered); |
8800 | goto again; | |
8801 | } | |
8802 | ||
fbf19087 JB |
8803 | /* |
8804 | * XXX - page_mkwrite gets called every time the page is dirtied, even | |
8805 | * if it was already dirty, so for space accounting reasons we need to | |
8806 | * clear any delalloc bits for the range we are fixing to save. There | |
8807 | * is probably a better way to do this, but for now keep consistent with | |
8808 | * prepare_pages in the normal write path. | |
8809 | */ | |
2ac55d41 | 8810 | clear_extent_bit(&BTRFS_I(inode)->io_tree, page_start, page_end, |
9e8a4a8b LB |
8811 | EXTENT_DIRTY | EXTENT_DELALLOC | |
8812 | EXTENT_DO_ACCOUNTING | EXTENT_DEFRAG, | |
2ac55d41 | 8813 | 0, 0, &cached_state, GFP_NOFS); |
fbf19087 | 8814 | |
2ac55d41 JB |
8815 | ret = btrfs_set_extent_delalloc(inode, page_start, page_end, |
8816 | &cached_state); | |
9ed74f2d | 8817 | if (ret) { |
2ac55d41 JB |
8818 | unlock_extent_cached(io_tree, page_start, page_end, |
8819 | &cached_state, GFP_NOFS); | |
9ed74f2d JB |
8820 | ret = VM_FAULT_SIGBUS; |
8821 | goto out_unlock; | |
8822 | } | |
e6dcd2dc | 8823 | ret = 0; |
9ebefb18 CM |
8824 | |
8825 | /* page is wholly or partially inside EOF */ | |
a52d9a80 | 8826 | if (page_start + PAGE_CACHE_SIZE > size) |
e6dcd2dc | 8827 | zero_start = size & ~PAGE_CACHE_MASK; |
9ebefb18 | 8828 | else |
e6dcd2dc | 8829 | zero_start = PAGE_CACHE_SIZE; |
9ebefb18 | 8830 | |
e6dcd2dc CM |
8831 | if (zero_start != PAGE_CACHE_SIZE) { |
8832 | kaddr = kmap(page); | |
8833 | memset(kaddr + zero_start, 0, PAGE_CACHE_SIZE - zero_start); | |
8834 | flush_dcache_page(page); | |
8835 | kunmap(page); | |
8836 | } | |
247e743c | 8837 | ClearPageChecked(page); |
e6dcd2dc | 8838 | set_page_dirty(page); |
50a9b214 | 8839 | SetPageUptodate(page); |
5a3f23d5 | 8840 | |
257c62e1 CM |
8841 | BTRFS_I(inode)->last_trans = root->fs_info->generation; |
8842 | BTRFS_I(inode)->last_sub_trans = BTRFS_I(inode)->root->log_transid; | |
46d8bc34 | 8843 | BTRFS_I(inode)->last_log_commit = BTRFS_I(inode)->root->last_log_commit; |
257c62e1 | 8844 | |
2ac55d41 | 8845 | unlock_extent_cached(io_tree, page_start, page_end, &cached_state, GFP_NOFS); |
9ebefb18 CM |
8846 | |
8847 | out_unlock: | |
b2b5ef5c JK |
8848 | if (!ret) { |
8849 | sb_end_pagefault(inode->i_sb); | |
50a9b214 | 8850 | return VM_FAULT_LOCKED; |
b2b5ef5c | 8851 | } |
9ebefb18 | 8852 | unlock_page(page); |
1832a6d5 | 8853 | out: |
7cf5b976 | 8854 | btrfs_delalloc_release_space(inode, page_start, PAGE_CACHE_SIZE); |
9998eb70 | 8855 | out_noreserve: |
b2b5ef5c | 8856 | sb_end_pagefault(inode->i_sb); |
9ebefb18 CM |
8857 | return ret; |
8858 | } | |
8859 | ||
a41ad394 | 8860 | static int btrfs_truncate(struct inode *inode) |
39279cc3 CM |
8861 | { |
8862 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
fcb80c2a | 8863 | struct btrfs_block_rsv *rsv; |
a71754fc | 8864 | int ret = 0; |
3893e33b | 8865 | int err = 0; |
39279cc3 | 8866 | struct btrfs_trans_handle *trans; |
dbe674a9 | 8867 | u64 mask = root->sectorsize - 1; |
07127184 | 8868 | u64 min_size = btrfs_calc_trunc_metadata_size(root, 1); |
39279cc3 | 8869 | |
0ef8b726 JB |
8870 | ret = btrfs_wait_ordered_range(inode, inode->i_size & (~mask), |
8871 | (u64)-1); | |
8872 | if (ret) | |
8873 | return ret; | |
39279cc3 | 8874 | |
fcb80c2a JB |
8875 | /* |
8876 | * Yes ladies and gentelment, this is indeed ugly. The fact is we have | |
8877 | * 3 things going on here | |
8878 | * | |
8879 | * 1) We need to reserve space for our orphan item and the space to | |
8880 | * delete our orphan item. Lord knows we don't want to have a dangling | |
8881 | * orphan item because we didn't reserve space to remove it. | |
8882 | * | |
8883 | * 2) We need to reserve space to update our inode. | |
8884 | * | |
8885 | * 3) We need to have something to cache all the space that is going to | |
8886 | * be free'd up by the truncate operation, but also have some slack | |
8887 | * space reserved in case it uses space during the truncate (thank you | |
8888 | * very much snapshotting). | |
8889 | * | |
8890 | * And we need these to all be seperate. The fact is we can use alot of | |
8891 | * space doing the truncate, and we have no earthly idea how much space | |
8892 | * we will use, so we need the truncate reservation to be seperate so it | |
8893 | * doesn't end up using space reserved for updating the inode or | |
8894 | * removing the orphan item. We also need to be able to stop the | |
8895 | * transaction and start a new one, which means we need to be able to | |
8896 | * update the inode several times, and we have no idea of knowing how | |
8897 | * many times that will be, so we can't just reserve 1 item for the | |
8898 | * entirety of the opration, so that has to be done seperately as well. | |
8899 | * Then there is the orphan item, which does indeed need to be held on | |
8900 | * to for the whole operation, and we need nobody to touch this reserved | |
8901 | * space except the orphan code. | |
8902 | * | |
8903 | * So that leaves us with | |
8904 | * | |
8905 | * 1) root->orphan_block_rsv - for the orphan deletion. | |
8906 | * 2) rsv - for the truncate reservation, which we will steal from the | |
8907 | * transaction reservation. | |
8908 | * 3) fs_info->trans_block_rsv - this will have 1 items worth left for | |
8909 | * updating the inode. | |
8910 | */ | |
66d8f3dd | 8911 | rsv = btrfs_alloc_block_rsv(root, BTRFS_BLOCK_RSV_TEMP); |
fcb80c2a JB |
8912 | if (!rsv) |
8913 | return -ENOMEM; | |
4a338542 | 8914 | rsv->size = min_size; |
ca7e70f5 | 8915 | rsv->failfast = 1; |
f0cd846e | 8916 | |
907cbceb | 8917 | /* |
07127184 | 8918 | * 1 for the truncate slack space |
907cbceb JB |
8919 | * 1 for updating the inode. |
8920 | */ | |
f3fe820c | 8921 | trans = btrfs_start_transaction(root, 2); |
fcb80c2a JB |
8922 | if (IS_ERR(trans)) { |
8923 | err = PTR_ERR(trans); | |
8924 | goto out; | |
8925 | } | |
f0cd846e | 8926 | |
907cbceb JB |
8927 | /* Migrate the slack space for the truncate to our reserve */ |
8928 | ret = btrfs_block_rsv_migrate(&root->fs_info->trans_block_rsv, rsv, | |
8929 | min_size); | |
fcb80c2a | 8930 | BUG_ON(ret); |
f0cd846e | 8931 | |
5dc562c5 JB |
8932 | /* |
8933 | * So if we truncate and then write and fsync we normally would just | |
8934 | * write the extents that changed, which is a problem if we need to | |
8935 | * first truncate that entire inode. So set this flag so we write out | |
8936 | * all of the extents in the inode to the sync log so we're completely | |
8937 | * safe. | |
8938 | */ | |
8939 | set_bit(BTRFS_INODE_NEEDS_FULL_SYNC, &BTRFS_I(inode)->runtime_flags); | |
ca7e70f5 | 8940 | trans->block_rsv = rsv; |
907cbceb | 8941 | |
8082510e YZ |
8942 | while (1) { |
8943 | ret = btrfs_truncate_inode_items(trans, root, inode, | |
8944 | inode->i_size, | |
8945 | BTRFS_EXTENT_DATA_KEY); | |
28ed1345 | 8946 | if (ret != -ENOSPC && ret != -EAGAIN) { |
3893e33b | 8947 | err = ret; |
8082510e | 8948 | break; |
3893e33b | 8949 | } |
39279cc3 | 8950 | |
fcb80c2a | 8951 | trans->block_rsv = &root->fs_info->trans_block_rsv; |
8082510e | 8952 | ret = btrfs_update_inode(trans, root, inode); |
3893e33b JB |
8953 | if (ret) { |
8954 | err = ret; | |
8955 | break; | |
8956 | } | |
ca7e70f5 | 8957 | |
8082510e | 8958 | btrfs_end_transaction(trans, root); |
b53d3f5d | 8959 | btrfs_btree_balance_dirty(root); |
ca7e70f5 JB |
8960 | |
8961 | trans = btrfs_start_transaction(root, 2); | |
8962 | if (IS_ERR(trans)) { | |
8963 | ret = err = PTR_ERR(trans); | |
8964 | trans = NULL; | |
8965 | break; | |
8966 | } | |
8967 | ||
8968 | ret = btrfs_block_rsv_migrate(&root->fs_info->trans_block_rsv, | |
8969 | rsv, min_size); | |
8970 | BUG_ON(ret); /* shouldn't happen */ | |
8971 | trans->block_rsv = rsv; | |
8082510e YZ |
8972 | } |
8973 | ||
8974 | if (ret == 0 && inode->i_nlink > 0) { | |
fcb80c2a | 8975 | trans->block_rsv = root->orphan_block_rsv; |
8082510e | 8976 | ret = btrfs_orphan_del(trans, inode); |
3893e33b JB |
8977 | if (ret) |
8978 | err = ret; | |
8082510e YZ |
8979 | } |
8980 | ||
917c16b2 CM |
8981 | if (trans) { |
8982 | trans->block_rsv = &root->fs_info->trans_block_rsv; | |
8983 | ret = btrfs_update_inode(trans, root, inode); | |
8984 | if (ret && !err) | |
8985 | err = ret; | |
7b128766 | 8986 | |
7ad85bb7 | 8987 | ret = btrfs_end_transaction(trans, root); |
b53d3f5d | 8988 | btrfs_btree_balance_dirty(root); |
917c16b2 | 8989 | } |
fcb80c2a JB |
8990 | |
8991 | out: | |
8992 | btrfs_free_block_rsv(root, rsv); | |
8993 | ||
3893e33b JB |
8994 | if (ret && !err) |
8995 | err = ret; | |
a41ad394 | 8996 | |
3893e33b | 8997 | return err; |
39279cc3 CM |
8998 | } |
8999 | ||
d352ac68 CM |
9000 | /* |
9001 | * create a new subvolume directory/inode (helper for the ioctl). | |
9002 | */ | |
d2fb3437 | 9003 | int btrfs_create_subvol_root(struct btrfs_trans_handle *trans, |
63541927 FDBM |
9004 | struct btrfs_root *new_root, |
9005 | struct btrfs_root *parent_root, | |
9006 | u64 new_dirid) | |
39279cc3 | 9007 | { |
39279cc3 | 9008 | struct inode *inode; |
76dda93c | 9009 | int err; |
00e4e6b3 | 9010 | u64 index = 0; |
39279cc3 | 9011 | |
12fc9d09 FA |
9012 | inode = btrfs_new_inode(trans, new_root, NULL, "..", 2, |
9013 | new_dirid, new_dirid, | |
9014 | S_IFDIR | (~current_umask() & S_IRWXUGO), | |
9015 | &index); | |
54aa1f4d | 9016 | if (IS_ERR(inode)) |
f46b5a66 | 9017 | return PTR_ERR(inode); |
39279cc3 CM |
9018 | inode->i_op = &btrfs_dir_inode_operations; |
9019 | inode->i_fop = &btrfs_dir_file_operations; | |
9020 | ||
bfe86848 | 9021 | set_nlink(inode, 1); |
dbe674a9 | 9022 | btrfs_i_size_write(inode, 0); |
b0d5d10f | 9023 | unlock_new_inode(inode); |
3b96362c | 9024 | |
63541927 FDBM |
9025 | err = btrfs_subvol_inherit_props(trans, new_root, parent_root); |
9026 | if (err) | |
9027 | btrfs_err(new_root->fs_info, | |
351fd353 | 9028 | "error inheriting subvolume %llu properties: %d", |
63541927 FDBM |
9029 | new_root->root_key.objectid, err); |
9030 | ||
76dda93c | 9031 | err = btrfs_update_inode(trans, new_root, inode); |
cb8e7090 | 9032 | |
76dda93c | 9033 | iput(inode); |
ce598979 | 9034 | return err; |
39279cc3 CM |
9035 | } |
9036 | ||
39279cc3 CM |
9037 | struct inode *btrfs_alloc_inode(struct super_block *sb) |
9038 | { | |
9039 | struct btrfs_inode *ei; | |
2ead6ae7 | 9040 | struct inode *inode; |
39279cc3 CM |
9041 | |
9042 | ei = kmem_cache_alloc(btrfs_inode_cachep, GFP_NOFS); | |
9043 | if (!ei) | |
9044 | return NULL; | |
2ead6ae7 YZ |
9045 | |
9046 | ei->root = NULL; | |
2ead6ae7 | 9047 | ei->generation = 0; |
15ee9bc7 | 9048 | ei->last_trans = 0; |
257c62e1 | 9049 | ei->last_sub_trans = 0; |
e02119d5 | 9050 | ei->logged_trans = 0; |
2ead6ae7 | 9051 | ei->delalloc_bytes = 0; |
47059d93 | 9052 | ei->defrag_bytes = 0; |
2ead6ae7 YZ |
9053 | ei->disk_i_size = 0; |
9054 | ei->flags = 0; | |
7709cde3 | 9055 | ei->csum_bytes = 0; |
2ead6ae7 | 9056 | ei->index_cnt = (u64)-1; |
67de1176 | 9057 | ei->dir_index = 0; |
2ead6ae7 | 9058 | ei->last_unlink_trans = 0; |
46d8bc34 | 9059 | ei->last_log_commit = 0; |
8089fe62 | 9060 | ei->delayed_iput_count = 0; |
2ead6ae7 | 9061 | |
9e0baf60 JB |
9062 | spin_lock_init(&ei->lock); |
9063 | ei->outstanding_extents = 0; | |
9064 | ei->reserved_extents = 0; | |
2ead6ae7 | 9065 | |
72ac3c0d | 9066 | ei->runtime_flags = 0; |
261507a0 | 9067 | ei->force_compress = BTRFS_COMPRESS_NONE; |
2ead6ae7 | 9068 | |
16cdcec7 MX |
9069 | ei->delayed_node = NULL; |
9070 | ||
9cc97d64 | 9071 | ei->i_otime.tv_sec = 0; |
9072 | ei->i_otime.tv_nsec = 0; | |
9073 | ||
2ead6ae7 | 9074 | inode = &ei->vfs_inode; |
a8067e02 | 9075 | extent_map_tree_init(&ei->extent_tree); |
f993c883 DS |
9076 | extent_io_tree_init(&ei->io_tree, &inode->i_data); |
9077 | extent_io_tree_init(&ei->io_failure_tree, &inode->i_data); | |
0b32f4bb JB |
9078 | ei->io_tree.track_uptodate = 1; |
9079 | ei->io_failure_tree.track_uptodate = 1; | |
b812ce28 | 9080 | atomic_set(&ei->sync_writers, 0); |
2ead6ae7 | 9081 | mutex_init(&ei->log_mutex); |
f248679e | 9082 | mutex_init(&ei->delalloc_mutex); |
e6dcd2dc | 9083 | btrfs_ordered_inode_tree_init(&ei->ordered_tree); |
2ead6ae7 | 9084 | INIT_LIST_HEAD(&ei->delalloc_inodes); |
8089fe62 | 9085 | INIT_LIST_HEAD(&ei->delayed_iput); |
2ead6ae7 YZ |
9086 | RB_CLEAR_NODE(&ei->rb_node); |
9087 | ||
9088 | return inode; | |
39279cc3 CM |
9089 | } |
9090 | ||
aaedb55b JB |
9091 | #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS |
9092 | void btrfs_test_destroy_inode(struct inode *inode) | |
9093 | { | |
9094 | btrfs_drop_extent_cache(inode, 0, (u64)-1, 0); | |
9095 | kmem_cache_free(btrfs_inode_cachep, BTRFS_I(inode)); | |
9096 | } | |
9097 | #endif | |
9098 | ||
fa0d7e3d NP |
9099 | static void btrfs_i_callback(struct rcu_head *head) |
9100 | { | |
9101 | struct inode *inode = container_of(head, struct inode, i_rcu); | |
fa0d7e3d NP |
9102 | kmem_cache_free(btrfs_inode_cachep, BTRFS_I(inode)); |
9103 | } | |
9104 | ||
39279cc3 CM |
9105 | void btrfs_destroy_inode(struct inode *inode) |
9106 | { | |
e6dcd2dc | 9107 | struct btrfs_ordered_extent *ordered; |
5a3f23d5 CM |
9108 | struct btrfs_root *root = BTRFS_I(inode)->root; |
9109 | ||
b3d9b7a3 | 9110 | WARN_ON(!hlist_empty(&inode->i_dentry)); |
39279cc3 | 9111 | WARN_ON(inode->i_data.nrpages); |
9e0baf60 JB |
9112 | WARN_ON(BTRFS_I(inode)->outstanding_extents); |
9113 | WARN_ON(BTRFS_I(inode)->reserved_extents); | |
7709cde3 JB |
9114 | WARN_ON(BTRFS_I(inode)->delalloc_bytes); |
9115 | WARN_ON(BTRFS_I(inode)->csum_bytes); | |
47059d93 | 9116 | WARN_ON(BTRFS_I(inode)->defrag_bytes); |
39279cc3 | 9117 | |
a6dbd429 JB |
9118 | /* |
9119 | * This can happen where we create an inode, but somebody else also | |
9120 | * created the same inode and we need to destroy the one we already | |
9121 | * created. | |
9122 | */ | |
9123 | if (!root) | |
9124 | goto free; | |
9125 | ||
8a35d95f JB |
9126 | if (test_bit(BTRFS_INODE_HAS_ORPHAN_ITEM, |
9127 | &BTRFS_I(inode)->runtime_flags)) { | |
c2cf52eb | 9128 | btrfs_info(root->fs_info, "inode %llu still on the orphan list", |
c1c9ff7c | 9129 | btrfs_ino(inode)); |
8a35d95f | 9130 | atomic_dec(&root->orphan_inodes); |
7b128766 | 9131 | } |
7b128766 | 9132 | |
d397712b | 9133 | while (1) { |
e6dcd2dc CM |
9134 | ordered = btrfs_lookup_first_ordered_extent(inode, (u64)-1); |
9135 | if (!ordered) | |
9136 | break; | |
9137 | else { | |
c2cf52eb | 9138 | btrfs_err(root->fs_info, "found ordered extent %llu %llu on inode cleanup", |
c1c9ff7c | 9139 | ordered->file_offset, ordered->len); |
e6dcd2dc CM |
9140 | btrfs_remove_ordered_extent(inode, ordered); |
9141 | btrfs_put_ordered_extent(ordered); | |
9142 | btrfs_put_ordered_extent(ordered); | |
9143 | } | |
9144 | } | |
56fa9d07 | 9145 | btrfs_qgroup_check_reserved_leak(inode); |
5d4f98a2 | 9146 | inode_tree_del(inode); |
5b21f2ed | 9147 | btrfs_drop_extent_cache(inode, 0, (u64)-1, 0); |
a6dbd429 | 9148 | free: |
fa0d7e3d | 9149 | call_rcu(&inode->i_rcu, btrfs_i_callback); |
39279cc3 CM |
9150 | } |
9151 | ||
45321ac5 | 9152 | int btrfs_drop_inode(struct inode *inode) |
76dda93c YZ |
9153 | { |
9154 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
45321ac5 | 9155 | |
6379ef9f NA |
9156 | if (root == NULL) |
9157 | return 1; | |
9158 | ||
fa6ac876 | 9159 | /* the snap/subvol tree is on deleting */ |
69e9c6c6 | 9160 | if (btrfs_root_refs(&root->root_item) == 0) |
45321ac5 | 9161 | return 1; |
76dda93c | 9162 | else |
45321ac5 | 9163 | return generic_drop_inode(inode); |
76dda93c YZ |
9164 | } |
9165 | ||
0ee0fda0 | 9166 | static void init_once(void *foo) |
39279cc3 CM |
9167 | { |
9168 | struct btrfs_inode *ei = (struct btrfs_inode *) foo; | |
9169 | ||
9170 | inode_init_once(&ei->vfs_inode); | |
9171 | } | |
9172 | ||
9173 | void btrfs_destroy_cachep(void) | |
9174 | { | |
8c0a8537 KS |
9175 | /* |
9176 | * Make sure all delayed rcu free inodes are flushed before we | |
9177 | * destroy cache. | |
9178 | */ | |
9179 | rcu_barrier(); | |
39279cc3 CM |
9180 | if (btrfs_inode_cachep) |
9181 | kmem_cache_destroy(btrfs_inode_cachep); | |
9182 | if (btrfs_trans_handle_cachep) | |
9183 | kmem_cache_destroy(btrfs_trans_handle_cachep); | |
9184 | if (btrfs_transaction_cachep) | |
9185 | kmem_cache_destroy(btrfs_transaction_cachep); | |
39279cc3 CM |
9186 | if (btrfs_path_cachep) |
9187 | kmem_cache_destroy(btrfs_path_cachep); | |
dc89e982 JB |
9188 | if (btrfs_free_space_cachep) |
9189 | kmem_cache_destroy(btrfs_free_space_cachep); | |
39279cc3 CM |
9190 | } |
9191 | ||
9192 | int btrfs_init_cachep(void) | |
9193 | { | |
837e1972 | 9194 | btrfs_inode_cachep = kmem_cache_create("btrfs_inode", |
9601e3f6 CH |
9195 | sizeof(struct btrfs_inode), 0, |
9196 | SLAB_RECLAIM_ACCOUNT | SLAB_MEM_SPREAD, init_once); | |
39279cc3 CM |
9197 | if (!btrfs_inode_cachep) |
9198 | goto fail; | |
9601e3f6 | 9199 | |
837e1972 | 9200 | btrfs_trans_handle_cachep = kmem_cache_create("btrfs_trans_handle", |
9601e3f6 CH |
9201 | sizeof(struct btrfs_trans_handle), 0, |
9202 | SLAB_RECLAIM_ACCOUNT | SLAB_MEM_SPREAD, NULL); | |
39279cc3 CM |
9203 | if (!btrfs_trans_handle_cachep) |
9204 | goto fail; | |
9601e3f6 | 9205 | |
837e1972 | 9206 | btrfs_transaction_cachep = kmem_cache_create("btrfs_transaction", |
9601e3f6 CH |
9207 | sizeof(struct btrfs_transaction), 0, |
9208 | SLAB_RECLAIM_ACCOUNT | SLAB_MEM_SPREAD, NULL); | |
39279cc3 CM |
9209 | if (!btrfs_transaction_cachep) |
9210 | goto fail; | |
9601e3f6 | 9211 | |
837e1972 | 9212 | btrfs_path_cachep = kmem_cache_create("btrfs_path", |
9601e3f6 CH |
9213 | sizeof(struct btrfs_path), 0, |
9214 | SLAB_RECLAIM_ACCOUNT | SLAB_MEM_SPREAD, NULL); | |
39279cc3 CM |
9215 | if (!btrfs_path_cachep) |
9216 | goto fail; | |
9601e3f6 | 9217 | |
837e1972 | 9218 | btrfs_free_space_cachep = kmem_cache_create("btrfs_free_space", |
dc89e982 JB |
9219 | sizeof(struct btrfs_free_space), 0, |
9220 | SLAB_RECLAIM_ACCOUNT | SLAB_MEM_SPREAD, NULL); | |
9221 | if (!btrfs_free_space_cachep) | |
9222 | goto fail; | |
9223 | ||
39279cc3 CM |
9224 | return 0; |
9225 | fail: | |
9226 | btrfs_destroy_cachep(); | |
9227 | return -ENOMEM; | |
9228 | } | |
9229 | ||
9230 | static int btrfs_getattr(struct vfsmount *mnt, | |
9231 | struct dentry *dentry, struct kstat *stat) | |
9232 | { | |
df0af1a5 | 9233 | u64 delalloc_bytes; |
2b0143b5 | 9234 | struct inode *inode = d_inode(dentry); |
fadc0d8b DS |
9235 | u32 blocksize = inode->i_sb->s_blocksize; |
9236 | ||
39279cc3 | 9237 | generic_fillattr(inode, stat); |
0ee5dc67 | 9238 | stat->dev = BTRFS_I(inode)->root->anon_dev; |
d6667462 | 9239 | stat->blksize = PAGE_CACHE_SIZE; |
df0af1a5 MX |
9240 | |
9241 | spin_lock(&BTRFS_I(inode)->lock); | |
9242 | delalloc_bytes = BTRFS_I(inode)->delalloc_bytes; | |
9243 | spin_unlock(&BTRFS_I(inode)->lock); | |
fadc0d8b | 9244 | stat->blocks = (ALIGN(inode_get_bytes(inode), blocksize) + |
df0af1a5 | 9245 | ALIGN(delalloc_bytes, blocksize)) >> 9; |
39279cc3 CM |
9246 | return 0; |
9247 | } | |
9248 | ||
d397712b CM |
9249 | static int btrfs_rename(struct inode *old_dir, struct dentry *old_dentry, |
9250 | struct inode *new_dir, struct dentry *new_dentry) | |
39279cc3 CM |
9251 | { |
9252 | struct btrfs_trans_handle *trans; | |
9253 | struct btrfs_root *root = BTRFS_I(old_dir)->root; | |
4df27c4d | 9254 | struct btrfs_root *dest = BTRFS_I(new_dir)->root; |
2b0143b5 DH |
9255 | struct inode *new_inode = d_inode(new_dentry); |
9256 | struct inode *old_inode = d_inode(old_dentry); | |
39279cc3 | 9257 | struct timespec ctime = CURRENT_TIME; |
00e4e6b3 | 9258 | u64 index = 0; |
4df27c4d | 9259 | u64 root_objectid; |
39279cc3 | 9260 | int ret; |
33345d01 | 9261 | u64 old_ino = btrfs_ino(old_inode); |
39279cc3 | 9262 | |
33345d01 | 9263 | if (btrfs_ino(new_dir) == BTRFS_EMPTY_SUBVOL_DIR_OBJECTID) |
f679a840 YZ |
9264 | return -EPERM; |
9265 | ||
4df27c4d | 9266 | /* we only allow rename subvolume link between subvolumes */ |
33345d01 | 9267 | if (old_ino != BTRFS_FIRST_FREE_OBJECTID && root != dest) |
3394e160 CM |
9268 | return -EXDEV; |
9269 | ||
33345d01 LZ |
9270 | if (old_ino == BTRFS_EMPTY_SUBVOL_DIR_OBJECTID || |
9271 | (new_inode && btrfs_ino(new_inode) == BTRFS_FIRST_FREE_OBJECTID)) | |
39279cc3 | 9272 | return -ENOTEMPTY; |
5f39d397 | 9273 | |
4df27c4d YZ |
9274 | if (S_ISDIR(old_inode->i_mode) && new_inode && |
9275 | new_inode->i_size > BTRFS_EMPTY_DIR_SIZE) | |
9276 | return -ENOTEMPTY; | |
9c52057c CM |
9277 | |
9278 | ||
9279 | /* check for collisions, even if the name isn't there */ | |
4871c158 | 9280 | ret = btrfs_check_dir_item_collision(dest, new_dir->i_ino, |
9c52057c CM |
9281 | new_dentry->d_name.name, |
9282 | new_dentry->d_name.len); | |
9283 | ||
9284 | if (ret) { | |
9285 | if (ret == -EEXIST) { | |
9286 | /* we shouldn't get | |
9287 | * eexist without a new_inode */ | |
fae7f21c | 9288 | if (WARN_ON(!new_inode)) { |
9c52057c CM |
9289 | return ret; |
9290 | } | |
9291 | } else { | |
9292 | /* maybe -EOVERFLOW */ | |
9293 | return ret; | |
9294 | } | |
9295 | } | |
9296 | ret = 0; | |
9297 | ||
5a3f23d5 | 9298 | /* |
8d875f95 CM |
9299 | * we're using rename to replace one file with another. Start IO on it |
9300 | * now so we don't add too much work to the end of the transaction | |
5a3f23d5 | 9301 | */ |
8d875f95 | 9302 | if (new_inode && S_ISREG(old_inode->i_mode) && new_inode->i_size) |
5a3f23d5 CM |
9303 | filemap_flush(old_inode->i_mapping); |
9304 | ||
76dda93c | 9305 | /* close the racy window with snapshot create/destroy ioctl */ |
33345d01 | 9306 | if (old_ino == BTRFS_FIRST_FREE_OBJECTID) |
76dda93c | 9307 | down_read(&root->fs_info->subvol_sem); |
a22285a6 YZ |
9308 | /* |
9309 | * We want to reserve the absolute worst case amount of items. So if | |
9310 | * both inodes are subvols and we need to unlink them then that would | |
9311 | * require 4 item modifications, but if they are both normal inodes it | |
9312 | * would require 5 item modifications, so we'll assume their normal | |
9313 | * inodes. So 5 * 2 is 10, plus 1 for the new link, so 11 total items | |
9314 | * should cover the worst case number of items we'll modify. | |
9315 | */ | |
6e137ed3 | 9316 | trans = btrfs_start_transaction(root, 11); |
b44c59a8 JL |
9317 | if (IS_ERR(trans)) { |
9318 | ret = PTR_ERR(trans); | |
9319 | goto out_notrans; | |
9320 | } | |
76dda93c | 9321 | |
4df27c4d YZ |
9322 | if (dest != root) |
9323 | btrfs_record_root_in_trans(trans, dest); | |
5f39d397 | 9324 | |
a5719521 YZ |
9325 | ret = btrfs_set_inode_index(new_dir, &index); |
9326 | if (ret) | |
9327 | goto out_fail; | |
5a3f23d5 | 9328 | |
67de1176 | 9329 | BTRFS_I(old_inode)->dir_index = 0ULL; |
33345d01 | 9330 | if (unlikely(old_ino == BTRFS_FIRST_FREE_OBJECTID)) { |
4df27c4d | 9331 | /* force full log commit if subvolume involved. */ |
995946dd | 9332 | btrfs_set_log_full_commit(root->fs_info, trans); |
4df27c4d | 9333 | } else { |
a5719521 YZ |
9334 | ret = btrfs_insert_inode_ref(trans, dest, |
9335 | new_dentry->d_name.name, | |
9336 | new_dentry->d_name.len, | |
33345d01 LZ |
9337 | old_ino, |
9338 | btrfs_ino(new_dir), index); | |
a5719521 YZ |
9339 | if (ret) |
9340 | goto out_fail; | |
4df27c4d YZ |
9341 | /* |
9342 | * this is an ugly little race, but the rename is required | |
9343 | * to make sure that if we crash, the inode is either at the | |
9344 | * old name or the new one. pinning the log transaction lets | |
9345 | * us make sure we don't allow a log commit to come in after | |
9346 | * we unlink the name but before we add the new name back in. | |
9347 | */ | |
9348 | btrfs_pin_log_trans(root); | |
9349 | } | |
5a3f23d5 | 9350 | |
0c4d2d95 JB |
9351 | inode_inc_iversion(old_dir); |
9352 | inode_inc_iversion(new_dir); | |
9353 | inode_inc_iversion(old_inode); | |
39279cc3 CM |
9354 | old_dir->i_ctime = old_dir->i_mtime = ctime; |
9355 | new_dir->i_ctime = new_dir->i_mtime = ctime; | |
9356 | old_inode->i_ctime = ctime; | |
5f39d397 | 9357 | |
12fcfd22 CM |
9358 | if (old_dentry->d_parent != new_dentry->d_parent) |
9359 | btrfs_record_unlink_dir(trans, old_dir, old_inode, 1); | |
9360 | ||
33345d01 | 9361 | if (unlikely(old_ino == BTRFS_FIRST_FREE_OBJECTID)) { |
4df27c4d YZ |
9362 | root_objectid = BTRFS_I(old_inode)->root->root_key.objectid; |
9363 | ret = btrfs_unlink_subvol(trans, root, old_dir, root_objectid, | |
9364 | old_dentry->d_name.name, | |
9365 | old_dentry->d_name.len); | |
9366 | } else { | |
92986796 | 9367 | ret = __btrfs_unlink_inode(trans, root, old_dir, |
2b0143b5 | 9368 | d_inode(old_dentry), |
92986796 AV |
9369 | old_dentry->d_name.name, |
9370 | old_dentry->d_name.len); | |
9371 | if (!ret) | |
9372 | ret = btrfs_update_inode(trans, root, old_inode); | |
4df27c4d | 9373 | } |
79787eaa JM |
9374 | if (ret) { |
9375 | btrfs_abort_transaction(trans, root, ret); | |
9376 | goto out_fail; | |
9377 | } | |
39279cc3 CM |
9378 | |
9379 | if (new_inode) { | |
0c4d2d95 | 9380 | inode_inc_iversion(new_inode); |
39279cc3 | 9381 | new_inode->i_ctime = CURRENT_TIME; |
33345d01 | 9382 | if (unlikely(btrfs_ino(new_inode) == |
4df27c4d YZ |
9383 | BTRFS_EMPTY_SUBVOL_DIR_OBJECTID)) { |
9384 | root_objectid = BTRFS_I(new_inode)->location.objectid; | |
9385 | ret = btrfs_unlink_subvol(trans, dest, new_dir, | |
9386 | root_objectid, | |
9387 | new_dentry->d_name.name, | |
9388 | new_dentry->d_name.len); | |
9389 | BUG_ON(new_inode->i_nlink == 0); | |
9390 | } else { | |
9391 | ret = btrfs_unlink_inode(trans, dest, new_dir, | |
2b0143b5 | 9392 | d_inode(new_dentry), |
4df27c4d YZ |
9393 | new_dentry->d_name.name, |
9394 | new_dentry->d_name.len); | |
9395 | } | |
4ef31a45 | 9396 | if (!ret && new_inode->i_nlink == 0) |
2b0143b5 | 9397 | ret = btrfs_orphan_add(trans, d_inode(new_dentry)); |
79787eaa JM |
9398 | if (ret) { |
9399 | btrfs_abort_transaction(trans, root, ret); | |
9400 | goto out_fail; | |
9401 | } | |
39279cc3 | 9402 | } |
aec7477b | 9403 | |
4df27c4d YZ |
9404 | ret = btrfs_add_link(trans, new_dir, old_inode, |
9405 | new_dentry->d_name.name, | |
a5719521 | 9406 | new_dentry->d_name.len, 0, index); |
79787eaa JM |
9407 | if (ret) { |
9408 | btrfs_abort_transaction(trans, root, ret); | |
9409 | goto out_fail; | |
9410 | } | |
39279cc3 | 9411 | |
67de1176 MX |
9412 | if (old_inode->i_nlink == 1) |
9413 | BTRFS_I(old_inode)->dir_index = index; | |
9414 | ||
33345d01 | 9415 | if (old_ino != BTRFS_FIRST_FREE_OBJECTID) { |
10d9f309 | 9416 | struct dentry *parent = new_dentry->d_parent; |
6a912213 | 9417 | btrfs_log_new_name(trans, old_inode, old_dir, parent); |
4df27c4d YZ |
9418 | btrfs_end_log_trans(root); |
9419 | } | |
39279cc3 | 9420 | out_fail: |
7ad85bb7 | 9421 | btrfs_end_transaction(trans, root); |
b44c59a8 | 9422 | out_notrans: |
33345d01 | 9423 | if (old_ino == BTRFS_FIRST_FREE_OBJECTID) |
76dda93c | 9424 | up_read(&root->fs_info->subvol_sem); |
9ed74f2d | 9425 | |
39279cc3 CM |
9426 | return ret; |
9427 | } | |
9428 | ||
80ace85c MS |
9429 | static int btrfs_rename2(struct inode *old_dir, struct dentry *old_dentry, |
9430 | struct inode *new_dir, struct dentry *new_dentry, | |
9431 | unsigned int flags) | |
9432 | { | |
9433 | if (flags & ~RENAME_NOREPLACE) | |
9434 | return -EINVAL; | |
9435 | ||
9436 | return btrfs_rename(old_dir, old_dentry, new_dir, new_dentry); | |
9437 | } | |
9438 | ||
8ccf6f19 MX |
9439 | static void btrfs_run_delalloc_work(struct btrfs_work *work) |
9440 | { | |
9441 | struct btrfs_delalloc_work *delalloc_work; | |
9f23e289 | 9442 | struct inode *inode; |
8ccf6f19 MX |
9443 | |
9444 | delalloc_work = container_of(work, struct btrfs_delalloc_work, | |
9445 | work); | |
9f23e289 | 9446 | inode = delalloc_work->inode; |
30424601 DS |
9447 | filemap_flush(inode->i_mapping); |
9448 | if (test_bit(BTRFS_INODE_HAS_ASYNC_EXTENT, | |
9449 | &BTRFS_I(inode)->runtime_flags)) | |
9f23e289 | 9450 | filemap_flush(inode->i_mapping); |
8ccf6f19 MX |
9451 | |
9452 | if (delalloc_work->delay_iput) | |
9f23e289 | 9453 | btrfs_add_delayed_iput(inode); |
8ccf6f19 | 9454 | else |
9f23e289 | 9455 | iput(inode); |
8ccf6f19 MX |
9456 | complete(&delalloc_work->completion); |
9457 | } | |
9458 | ||
9459 | struct btrfs_delalloc_work *btrfs_alloc_delalloc_work(struct inode *inode, | |
651d494a | 9460 | int delay_iput) |
8ccf6f19 MX |
9461 | { |
9462 | struct btrfs_delalloc_work *work; | |
9463 | ||
100d5702 | 9464 | work = kmalloc(sizeof(*work), GFP_NOFS); |
8ccf6f19 MX |
9465 | if (!work) |
9466 | return NULL; | |
9467 | ||
9468 | init_completion(&work->completion); | |
9469 | INIT_LIST_HEAD(&work->list); | |
9470 | work->inode = inode; | |
8ccf6f19 | 9471 | work->delay_iput = delay_iput; |
9e0af237 LB |
9472 | WARN_ON_ONCE(!inode); |
9473 | btrfs_init_work(&work->work, btrfs_flush_delalloc_helper, | |
9474 | btrfs_run_delalloc_work, NULL, NULL); | |
8ccf6f19 MX |
9475 | |
9476 | return work; | |
9477 | } | |
9478 | ||
9479 | void btrfs_wait_and_free_delalloc_work(struct btrfs_delalloc_work *work) | |
9480 | { | |
9481 | wait_for_completion(&work->completion); | |
100d5702 | 9482 | kfree(work); |
8ccf6f19 MX |
9483 | } |
9484 | ||
d352ac68 CM |
9485 | /* |
9486 | * some fairly slow code that needs optimization. This walks the list | |
9487 | * of all the inodes with pending delalloc and forces them to disk. | |
9488 | */ | |
6c255e67 MX |
9489 | static int __start_delalloc_inodes(struct btrfs_root *root, int delay_iput, |
9490 | int nr) | |
ea8c2819 | 9491 | { |
ea8c2819 | 9492 | struct btrfs_inode *binode; |
5b21f2ed | 9493 | struct inode *inode; |
8ccf6f19 MX |
9494 | struct btrfs_delalloc_work *work, *next; |
9495 | struct list_head works; | |
1eafa6c7 | 9496 | struct list_head splice; |
8ccf6f19 | 9497 | int ret = 0; |
ea8c2819 | 9498 | |
8ccf6f19 | 9499 | INIT_LIST_HEAD(&works); |
1eafa6c7 | 9500 | INIT_LIST_HEAD(&splice); |
63607cc8 | 9501 | |
573bfb72 | 9502 | mutex_lock(&root->delalloc_mutex); |
eb73c1b7 MX |
9503 | spin_lock(&root->delalloc_lock); |
9504 | list_splice_init(&root->delalloc_inodes, &splice); | |
1eafa6c7 MX |
9505 | while (!list_empty(&splice)) { |
9506 | binode = list_entry(splice.next, struct btrfs_inode, | |
ea8c2819 | 9507 | delalloc_inodes); |
1eafa6c7 | 9508 | |
eb73c1b7 MX |
9509 | list_move_tail(&binode->delalloc_inodes, |
9510 | &root->delalloc_inodes); | |
5b21f2ed | 9511 | inode = igrab(&binode->vfs_inode); |
df0af1a5 | 9512 | if (!inode) { |
eb73c1b7 | 9513 | cond_resched_lock(&root->delalloc_lock); |
1eafa6c7 | 9514 | continue; |
df0af1a5 | 9515 | } |
eb73c1b7 | 9516 | spin_unlock(&root->delalloc_lock); |
1eafa6c7 | 9517 | |
651d494a | 9518 | work = btrfs_alloc_delalloc_work(inode, delay_iput); |
5d99a998 | 9519 | if (!work) { |
f4ab9ea7 JB |
9520 | if (delay_iput) |
9521 | btrfs_add_delayed_iput(inode); | |
9522 | else | |
9523 | iput(inode); | |
1eafa6c7 | 9524 | ret = -ENOMEM; |
a1ecaabb | 9525 | goto out; |
5b21f2ed | 9526 | } |
1eafa6c7 | 9527 | list_add_tail(&work->list, &works); |
a44903ab QW |
9528 | btrfs_queue_work(root->fs_info->flush_workers, |
9529 | &work->work); | |
6c255e67 MX |
9530 | ret++; |
9531 | if (nr != -1 && ret >= nr) | |
a1ecaabb | 9532 | goto out; |
5b21f2ed | 9533 | cond_resched(); |
eb73c1b7 | 9534 | spin_lock(&root->delalloc_lock); |
ea8c2819 | 9535 | } |
eb73c1b7 | 9536 | spin_unlock(&root->delalloc_lock); |
8c8bee1d | 9537 | |
a1ecaabb | 9538 | out: |
eb73c1b7 MX |
9539 | list_for_each_entry_safe(work, next, &works, list) { |
9540 | list_del_init(&work->list); | |
9541 | btrfs_wait_and_free_delalloc_work(work); | |
9542 | } | |
9543 | ||
9544 | if (!list_empty_careful(&splice)) { | |
9545 | spin_lock(&root->delalloc_lock); | |
9546 | list_splice_tail(&splice, &root->delalloc_inodes); | |
9547 | spin_unlock(&root->delalloc_lock); | |
9548 | } | |
573bfb72 | 9549 | mutex_unlock(&root->delalloc_mutex); |
eb73c1b7 MX |
9550 | return ret; |
9551 | } | |
1eafa6c7 | 9552 | |
eb73c1b7 MX |
9553 | int btrfs_start_delalloc_inodes(struct btrfs_root *root, int delay_iput) |
9554 | { | |
9555 | int ret; | |
1eafa6c7 | 9556 | |
2c21b4d7 | 9557 | if (test_bit(BTRFS_FS_STATE_ERROR, &root->fs_info->fs_state)) |
eb73c1b7 MX |
9558 | return -EROFS; |
9559 | ||
6c255e67 MX |
9560 | ret = __start_delalloc_inodes(root, delay_iput, -1); |
9561 | if (ret > 0) | |
9562 | ret = 0; | |
eb73c1b7 MX |
9563 | /* |
9564 | * the filemap_flush will queue IO into the worker threads, but | |
8c8bee1d CM |
9565 | * we have to make sure the IO is actually started and that |
9566 | * ordered extents get created before we return | |
9567 | */ | |
9568 | atomic_inc(&root->fs_info->async_submit_draining); | |
d397712b | 9569 | while (atomic_read(&root->fs_info->nr_async_submits) || |
771ed689 | 9570 | atomic_read(&root->fs_info->async_delalloc_pages)) { |
8c8bee1d | 9571 | wait_event(root->fs_info->async_submit_wait, |
771ed689 CM |
9572 | (atomic_read(&root->fs_info->nr_async_submits) == 0 && |
9573 | atomic_read(&root->fs_info->async_delalloc_pages) == 0)); | |
8c8bee1d CM |
9574 | } |
9575 | atomic_dec(&root->fs_info->async_submit_draining); | |
eb73c1b7 MX |
9576 | return ret; |
9577 | } | |
9578 | ||
6c255e67 MX |
9579 | int btrfs_start_delalloc_roots(struct btrfs_fs_info *fs_info, int delay_iput, |
9580 | int nr) | |
eb73c1b7 MX |
9581 | { |
9582 | struct btrfs_root *root; | |
9583 | struct list_head splice; | |
9584 | int ret; | |
9585 | ||
2c21b4d7 | 9586 | if (test_bit(BTRFS_FS_STATE_ERROR, &fs_info->fs_state)) |
eb73c1b7 MX |
9587 | return -EROFS; |
9588 | ||
9589 | INIT_LIST_HEAD(&splice); | |
9590 | ||
573bfb72 | 9591 | mutex_lock(&fs_info->delalloc_root_mutex); |
eb73c1b7 MX |
9592 | spin_lock(&fs_info->delalloc_root_lock); |
9593 | list_splice_init(&fs_info->delalloc_roots, &splice); | |
6c255e67 | 9594 | while (!list_empty(&splice) && nr) { |
eb73c1b7 MX |
9595 | root = list_first_entry(&splice, struct btrfs_root, |
9596 | delalloc_root); | |
9597 | root = btrfs_grab_fs_root(root); | |
9598 | BUG_ON(!root); | |
9599 | list_move_tail(&root->delalloc_root, | |
9600 | &fs_info->delalloc_roots); | |
9601 | spin_unlock(&fs_info->delalloc_root_lock); | |
9602 | ||
6c255e67 | 9603 | ret = __start_delalloc_inodes(root, delay_iput, nr); |
eb73c1b7 | 9604 | btrfs_put_fs_root(root); |
6c255e67 | 9605 | if (ret < 0) |
eb73c1b7 MX |
9606 | goto out; |
9607 | ||
6c255e67 MX |
9608 | if (nr != -1) { |
9609 | nr -= ret; | |
9610 | WARN_ON(nr < 0); | |
9611 | } | |
eb73c1b7 | 9612 | spin_lock(&fs_info->delalloc_root_lock); |
8ccf6f19 | 9613 | } |
eb73c1b7 | 9614 | spin_unlock(&fs_info->delalloc_root_lock); |
1eafa6c7 | 9615 | |
6c255e67 | 9616 | ret = 0; |
eb73c1b7 MX |
9617 | atomic_inc(&fs_info->async_submit_draining); |
9618 | while (atomic_read(&fs_info->nr_async_submits) || | |
9619 | atomic_read(&fs_info->async_delalloc_pages)) { | |
9620 | wait_event(fs_info->async_submit_wait, | |
9621 | (atomic_read(&fs_info->nr_async_submits) == 0 && | |
9622 | atomic_read(&fs_info->async_delalloc_pages) == 0)); | |
9623 | } | |
9624 | atomic_dec(&fs_info->async_submit_draining); | |
eb73c1b7 | 9625 | out: |
1eafa6c7 | 9626 | if (!list_empty_careful(&splice)) { |
eb73c1b7 MX |
9627 | spin_lock(&fs_info->delalloc_root_lock); |
9628 | list_splice_tail(&splice, &fs_info->delalloc_roots); | |
9629 | spin_unlock(&fs_info->delalloc_root_lock); | |
1eafa6c7 | 9630 | } |
573bfb72 | 9631 | mutex_unlock(&fs_info->delalloc_root_mutex); |
8ccf6f19 | 9632 | return ret; |
ea8c2819 CM |
9633 | } |
9634 | ||
39279cc3 CM |
9635 | static int btrfs_symlink(struct inode *dir, struct dentry *dentry, |
9636 | const char *symname) | |
9637 | { | |
9638 | struct btrfs_trans_handle *trans; | |
9639 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
9640 | struct btrfs_path *path; | |
9641 | struct btrfs_key key; | |
1832a6d5 | 9642 | struct inode *inode = NULL; |
39279cc3 CM |
9643 | int err; |
9644 | int drop_inode = 0; | |
9645 | u64 objectid; | |
67871254 | 9646 | u64 index = 0; |
39279cc3 CM |
9647 | int name_len; |
9648 | int datasize; | |
5f39d397 | 9649 | unsigned long ptr; |
39279cc3 | 9650 | struct btrfs_file_extent_item *ei; |
5f39d397 | 9651 | struct extent_buffer *leaf; |
39279cc3 | 9652 | |
f06becc4 | 9653 | name_len = strlen(symname); |
39279cc3 CM |
9654 | if (name_len > BTRFS_MAX_INLINE_DATA_SIZE(root)) |
9655 | return -ENAMETOOLONG; | |
1832a6d5 | 9656 | |
9ed74f2d JB |
9657 | /* |
9658 | * 2 items for inode item and ref | |
9659 | * 2 items for dir items | |
9269d12b FM |
9660 | * 1 item for updating parent inode item |
9661 | * 1 item for the inline extent item | |
9ed74f2d JB |
9662 | * 1 item for xattr if selinux is on |
9663 | */ | |
9269d12b | 9664 | trans = btrfs_start_transaction(root, 7); |
a22285a6 YZ |
9665 | if (IS_ERR(trans)) |
9666 | return PTR_ERR(trans); | |
1832a6d5 | 9667 | |
581bb050 LZ |
9668 | err = btrfs_find_free_ino(root, &objectid); |
9669 | if (err) | |
9670 | goto out_unlock; | |
9671 | ||
aec7477b | 9672 | inode = btrfs_new_inode(trans, root, dir, dentry->d_name.name, |
33345d01 | 9673 | dentry->d_name.len, btrfs_ino(dir), objectid, |
d82a6f1d | 9674 | S_IFLNK|S_IRWXUGO, &index); |
7cf96da3 TI |
9675 | if (IS_ERR(inode)) { |
9676 | err = PTR_ERR(inode); | |
39279cc3 | 9677 | goto out_unlock; |
7cf96da3 | 9678 | } |
39279cc3 | 9679 | |
ad19db71 CS |
9680 | /* |
9681 | * If the active LSM wants to access the inode during | |
9682 | * d_instantiate it needs these. Smack checks to see | |
9683 | * if the filesystem supports xattrs by looking at the | |
9684 | * ops vector. | |
9685 | */ | |
9686 | inode->i_fop = &btrfs_file_operations; | |
9687 | inode->i_op = &btrfs_file_inode_operations; | |
b0d5d10f | 9688 | inode->i_mapping->a_ops = &btrfs_aops; |
b0d5d10f CM |
9689 | BTRFS_I(inode)->io_tree.ops = &btrfs_extent_io_ops; |
9690 | ||
9691 | err = btrfs_init_inode_security(trans, inode, dir, &dentry->d_name); | |
9692 | if (err) | |
9693 | goto out_unlock_inode; | |
ad19db71 | 9694 | |
39279cc3 | 9695 | path = btrfs_alloc_path(); |
d8926bb3 MF |
9696 | if (!path) { |
9697 | err = -ENOMEM; | |
b0d5d10f | 9698 | goto out_unlock_inode; |
d8926bb3 | 9699 | } |
33345d01 | 9700 | key.objectid = btrfs_ino(inode); |
39279cc3 | 9701 | key.offset = 0; |
962a298f | 9702 | key.type = BTRFS_EXTENT_DATA_KEY; |
39279cc3 CM |
9703 | datasize = btrfs_file_extent_calc_inline_size(name_len); |
9704 | err = btrfs_insert_empty_item(trans, root, path, &key, | |
9705 | datasize); | |
54aa1f4d | 9706 | if (err) { |
b0839166 | 9707 | btrfs_free_path(path); |
b0d5d10f | 9708 | goto out_unlock_inode; |
54aa1f4d | 9709 | } |
5f39d397 CM |
9710 | leaf = path->nodes[0]; |
9711 | ei = btrfs_item_ptr(leaf, path->slots[0], | |
9712 | struct btrfs_file_extent_item); | |
9713 | btrfs_set_file_extent_generation(leaf, ei, trans->transid); | |
9714 | btrfs_set_file_extent_type(leaf, ei, | |
39279cc3 | 9715 | BTRFS_FILE_EXTENT_INLINE); |
c8b97818 CM |
9716 | btrfs_set_file_extent_encryption(leaf, ei, 0); |
9717 | btrfs_set_file_extent_compression(leaf, ei, 0); | |
9718 | btrfs_set_file_extent_other_encoding(leaf, ei, 0); | |
9719 | btrfs_set_file_extent_ram_bytes(leaf, ei, name_len); | |
9720 | ||
39279cc3 | 9721 | ptr = btrfs_file_extent_inline_start(ei); |
5f39d397 CM |
9722 | write_extent_buffer(leaf, symname, ptr, name_len); |
9723 | btrfs_mark_buffer_dirty(leaf); | |
39279cc3 | 9724 | btrfs_free_path(path); |
5f39d397 | 9725 | |
39279cc3 CM |
9726 | inode->i_op = &btrfs_symlink_inode_operations; |
9727 | inode->i_mapping->a_ops = &btrfs_symlink_aops; | |
d899e052 | 9728 | inode_set_bytes(inode, name_len); |
f06becc4 | 9729 | btrfs_i_size_write(inode, name_len); |
54aa1f4d | 9730 | err = btrfs_update_inode(trans, root, inode); |
d50866d0 FM |
9731 | /* |
9732 | * Last step, add directory indexes for our symlink inode. This is the | |
9733 | * last step to avoid extra cleanup of these indexes if an error happens | |
9734 | * elsewhere above. | |
9735 | */ | |
9736 | if (!err) | |
9737 | err = btrfs_add_nondir(trans, dir, dentry, inode, 0, index); | |
b0d5d10f | 9738 | if (err) { |
54aa1f4d | 9739 | drop_inode = 1; |
b0d5d10f CM |
9740 | goto out_unlock_inode; |
9741 | } | |
9742 | ||
9743 | unlock_new_inode(inode); | |
9744 | d_instantiate(dentry, inode); | |
39279cc3 CM |
9745 | |
9746 | out_unlock: | |
7ad85bb7 | 9747 | btrfs_end_transaction(trans, root); |
39279cc3 CM |
9748 | if (drop_inode) { |
9749 | inode_dec_link_count(inode); | |
9750 | iput(inode); | |
9751 | } | |
b53d3f5d | 9752 | btrfs_btree_balance_dirty(root); |
39279cc3 | 9753 | return err; |
b0d5d10f CM |
9754 | |
9755 | out_unlock_inode: | |
9756 | drop_inode = 1; | |
9757 | unlock_new_inode(inode); | |
9758 | goto out_unlock; | |
39279cc3 | 9759 | } |
16432985 | 9760 | |
0af3d00b JB |
9761 | static int __btrfs_prealloc_file_range(struct inode *inode, int mode, |
9762 | u64 start, u64 num_bytes, u64 min_size, | |
9763 | loff_t actual_len, u64 *alloc_hint, | |
9764 | struct btrfs_trans_handle *trans) | |
d899e052 | 9765 | { |
5dc562c5 JB |
9766 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; |
9767 | struct extent_map *em; | |
d899e052 YZ |
9768 | struct btrfs_root *root = BTRFS_I(inode)->root; |
9769 | struct btrfs_key ins; | |
d899e052 | 9770 | u64 cur_offset = start; |
55a61d1d | 9771 | u64 i_size; |
154ea289 | 9772 | u64 cur_bytes; |
0b670dc4 | 9773 | u64 last_alloc = (u64)-1; |
d899e052 | 9774 | int ret = 0; |
0af3d00b | 9775 | bool own_trans = true; |
d899e052 | 9776 | |
0af3d00b JB |
9777 | if (trans) |
9778 | own_trans = false; | |
d899e052 | 9779 | while (num_bytes > 0) { |
0af3d00b JB |
9780 | if (own_trans) { |
9781 | trans = btrfs_start_transaction(root, 3); | |
9782 | if (IS_ERR(trans)) { | |
9783 | ret = PTR_ERR(trans); | |
9784 | break; | |
9785 | } | |
5a303d5d YZ |
9786 | } |
9787 | ||
ee22184b | 9788 | cur_bytes = min_t(u64, num_bytes, SZ_256M); |
154ea289 | 9789 | cur_bytes = max(cur_bytes, min_size); |
0b670dc4 JB |
9790 | /* |
9791 | * If we are severely fragmented we could end up with really | |
9792 | * small allocations, so if the allocator is returning small | |
9793 | * chunks lets make its job easier by only searching for those | |
9794 | * sized chunks. | |
9795 | */ | |
9796 | cur_bytes = min(cur_bytes, last_alloc); | |
00361589 | 9797 | ret = btrfs_reserve_extent(root, cur_bytes, min_size, 0, |
e570fd27 | 9798 | *alloc_hint, &ins, 1, 0); |
5a303d5d | 9799 | if (ret) { |
0af3d00b JB |
9800 | if (own_trans) |
9801 | btrfs_end_transaction(trans, root); | |
a22285a6 | 9802 | break; |
d899e052 | 9803 | } |
5a303d5d | 9804 | |
0b670dc4 | 9805 | last_alloc = ins.offset; |
d899e052 YZ |
9806 | ret = insert_reserved_file_extent(trans, inode, |
9807 | cur_offset, ins.objectid, | |
9808 | ins.offset, ins.offset, | |
920bbbfb | 9809 | ins.offset, 0, 0, 0, |
d899e052 | 9810 | BTRFS_FILE_EXTENT_PREALLOC); |
79787eaa | 9811 | if (ret) { |
857cc2fc | 9812 | btrfs_free_reserved_extent(root, ins.objectid, |
e570fd27 | 9813 | ins.offset, 0); |
79787eaa JM |
9814 | btrfs_abort_transaction(trans, root, ret); |
9815 | if (own_trans) | |
9816 | btrfs_end_transaction(trans, root); | |
9817 | break; | |
9818 | } | |
31193213 | 9819 | |
a1ed835e CM |
9820 | btrfs_drop_extent_cache(inode, cur_offset, |
9821 | cur_offset + ins.offset -1, 0); | |
5a303d5d | 9822 | |
5dc562c5 JB |
9823 | em = alloc_extent_map(); |
9824 | if (!em) { | |
9825 | set_bit(BTRFS_INODE_NEEDS_FULL_SYNC, | |
9826 | &BTRFS_I(inode)->runtime_flags); | |
9827 | goto next; | |
9828 | } | |
9829 | ||
9830 | em->start = cur_offset; | |
9831 | em->orig_start = cur_offset; | |
9832 | em->len = ins.offset; | |
9833 | em->block_start = ins.objectid; | |
9834 | em->block_len = ins.offset; | |
b4939680 | 9835 | em->orig_block_len = ins.offset; |
cc95bef6 | 9836 | em->ram_bytes = ins.offset; |
5dc562c5 JB |
9837 | em->bdev = root->fs_info->fs_devices->latest_bdev; |
9838 | set_bit(EXTENT_FLAG_PREALLOC, &em->flags); | |
9839 | em->generation = trans->transid; | |
9840 | ||
9841 | while (1) { | |
9842 | write_lock(&em_tree->lock); | |
09a2a8f9 | 9843 | ret = add_extent_mapping(em_tree, em, 1); |
5dc562c5 JB |
9844 | write_unlock(&em_tree->lock); |
9845 | if (ret != -EEXIST) | |
9846 | break; | |
9847 | btrfs_drop_extent_cache(inode, cur_offset, | |
9848 | cur_offset + ins.offset - 1, | |
9849 | 0); | |
9850 | } | |
9851 | free_extent_map(em); | |
9852 | next: | |
d899e052 YZ |
9853 | num_bytes -= ins.offset; |
9854 | cur_offset += ins.offset; | |
efa56464 | 9855 | *alloc_hint = ins.objectid + ins.offset; |
5a303d5d | 9856 | |
0c4d2d95 | 9857 | inode_inc_iversion(inode); |
d899e052 | 9858 | inode->i_ctime = CURRENT_TIME; |
6cbff00f | 9859 | BTRFS_I(inode)->flags |= BTRFS_INODE_PREALLOC; |
d899e052 | 9860 | if (!(mode & FALLOC_FL_KEEP_SIZE) && |
efa56464 YZ |
9861 | (actual_len > inode->i_size) && |
9862 | (cur_offset > inode->i_size)) { | |
d1ea6a61 | 9863 | if (cur_offset > actual_len) |
55a61d1d | 9864 | i_size = actual_len; |
d1ea6a61 | 9865 | else |
55a61d1d JB |
9866 | i_size = cur_offset; |
9867 | i_size_write(inode, i_size); | |
9868 | btrfs_ordered_update_i_size(inode, i_size, NULL); | |
5a303d5d YZ |
9869 | } |
9870 | ||
d899e052 | 9871 | ret = btrfs_update_inode(trans, root, inode); |
79787eaa JM |
9872 | |
9873 | if (ret) { | |
9874 | btrfs_abort_transaction(trans, root, ret); | |
9875 | if (own_trans) | |
9876 | btrfs_end_transaction(trans, root); | |
9877 | break; | |
9878 | } | |
d899e052 | 9879 | |
0af3d00b JB |
9880 | if (own_trans) |
9881 | btrfs_end_transaction(trans, root); | |
5a303d5d | 9882 | } |
d899e052 YZ |
9883 | return ret; |
9884 | } | |
9885 | ||
0af3d00b JB |
9886 | int btrfs_prealloc_file_range(struct inode *inode, int mode, |
9887 | u64 start, u64 num_bytes, u64 min_size, | |
9888 | loff_t actual_len, u64 *alloc_hint) | |
9889 | { | |
9890 | return __btrfs_prealloc_file_range(inode, mode, start, num_bytes, | |
9891 | min_size, actual_len, alloc_hint, | |
9892 | NULL); | |
9893 | } | |
9894 | ||
9895 | int btrfs_prealloc_file_range_trans(struct inode *inode, | |
9896 | struct btrfs_trans_handle *trans, int mode, | |
9897 | u64 start, u64 num_bytes, u64 min_size, | |
9898 | loff_t actual_len, u64 *alloc_hint) | |
9899 | { | |
9900 | return __btrfs_prealloc_file_range(inode, mode, start, num_bytes, | |
9901 | min_size, actual_len, alloc_hint, trans); | |
9902 | } | |
9903 | ||
e6dcd2dc CM |
9904 | static int btrfs_set_page_dirty(struct page *page) |
9905 | { | |
e6dcd2dc CM |
9906 | return __set_page_dirty_nobuffers(page); |
9907 | } | |
9908 | ||
10556cb2 | 9909 | static int btrfs_permission(struct inode *inode, int mask) |
fdebe2bd | 9910 | { |
b83cc969 | 9911 | struct btrfs_root *root = BTRFS_I(inode)->root; |
cb6db4e5 | 9912 | umode_t mode = inode->i_mode; |
b83cc969 | 9913 | |
cb6db4e5 JM |
9914 | if (mask & MAY_WRITE && |
9915 | (S_ISREG(mode) || S_ISDIR(mode) || S_ISLNK(mode))) { | |
9916 | if (btrfs_root_readonly(root)) | |
9917 | return -EROFS; | |
9918 | if (BTRFS_I(inode)->flags & BTRFS_INODE_READONLY) | |
9919 | return -EACCES; | |
9920 | } | |
2830ba7f | 9921 | return generic_permission(inode, mask); |
fdebe2bd | 9922 | } |
39279cc3 | 9923 | |
ef3b9af5 FM |
9924 | static int btrfs_tmpfile(struct inode *dir, struct dentry *dentry, umode_t mode) |
9925 | { | |
9926 | struct btrfs_trans_handle *trans; | |
9927 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
9928 | struct inode *inode = NULL; | |
9929 | u64 objectid; | |
9930 | u64 index; | |
9931 | int ret = 0; | |
9932 | ||
9933 | /* | |
9934 | * 5 units required for adding orphan entry | |
9935 | */ | |
9936 | trans = btrfs_start_transaction(root, 5); | |
9937 | if (IS_ERR(trans)) | |
9938 | return PTR_ERR(trans); | |
9939 | ||
9940 | ret = btrfs_find_free_ino(root, &objectid); | |
9941 | if (ret) | |
9942 | goto out; | |
9943 | ||
9944 | inode = btrfs_new_inode(trans, root, dir, NULL, 0, | |
9945 | btrfs_ino(dir), objectid, mode, &index); | |
9946 | if (IS_ERR(inode)) { | |
9947 | ret = PTR_ERR(inode); | |
9948 | inode = NULL; | |
9949 | goto out; | |
9950 | } | |
9951 | ||
ef3b9af5 FM |
9952 | inode->i_fop = &btrfs_file_operations; |
9953 | inode->i_op = &btrfs_file_inode_operations; | |
9954 | ||
9955 | inode->i_mapping->a_ops = &btrfs_aops; | |
ef3b9af5 FM |
9956 | BTRFS_I(inode)->io_tree.ops = &btrfs_extent_io_ops; |
9957 | ||
b0d5d10f CM |
9958 | ret = btrfs_init_inode_security(trans, inode, dir, NULL); |
9959 | if (ret) | |
9960 | goto out_inode; | |
9961 | ||
9962 | ret = btrfs_update_inode(trans, root, inode); | |
9963 | if (ret) | |
9964 | goto out_inode; | |
ef3b9af5 FM |
9965 | ret = btrfs_orphan_add(trans, inode); |
9966 | if (ret) | |
b0d5d10f | 9967 | goto out_inode; |
ef3b9af5 | 9968 | |
5762b5c9 FM |
9969 | /* |
9970 | * We set number of links to 0 in btrfs_new_inode(), and here we set | |
9971 | * it to 1 because d_tmpfile() will issue a warning if the count is 0, | |
9972 | * through: | |
9973 | * | |
9974 | * d_tmpfile() -> inode_dec_link_count() -> drop_nlink() | |
9975 | */ | |
9976 | set_nlink(inode, 1); | |
b0d5d10f | 9977 | unlock_new_inode(inode); |
ef3b9af5 FM |
9978 | d_tmpfile(dentry, inode); |
9979 | mark_inode_dirty(inode); | |
9980 | ||
9981 | out: | |
9982 | btrfs_end_transaction(trans, root); | |
9983 | if (ret) | |
9984 | iput(inode); | |
9985 | btrfs_balance_delayed_items(root); | |
9986 | btrfs_btree_balance_dirty(root); | |
ef3b9af5 | 9987 | return ret; |
b0d5d10f CM |
9988 | |
9989 | out_inode: | |
9990 | unlock_new_inode(inode); | |
9991 | goto out; | |
9992 | ||
ef3b9af5 FM |
9993 | } |
9994 | ||
b38ef71c FM |
9995 | /* Inspired by filemap_check_errors() */ |
9996 | int btrfs_inode_check_errors(struct inode *inode) | |
9997 | { | |
9998 | int ret = 0; | |
9999 | ||
10000 | if (test_bit(AS_ENOSPC, &inode->i_mapping->flags) && | |
10001 | test_and_clear_bit(AS_ENOSPC, &inode->i_mapping->flags)) | |
10002 | ret = -ENOSPC; | |
10003 | if (test_bit(AS_EIO, &inode->i_mapping->flags) && | |
10004 | test_and_clear_bit(AS_EIO, &inode->i_mapping->flags)) | |
10005 | ret = -EIO; | |
10006 | ||
10007 | return ret; | |
10008 | } | |
10009 | ||
6e1d5dcc | 10010 | static const struct inode_operations btrfs_dir_inode_operations = { |
3394e160 | 10011 | .getattr = btrfs_getattr, |
39279cc3 CM |
10012 | .lookup = btrfs_lookup, |
10013 | .create = btrfs_create, | |
10014 | .unlink = btrfs_unlink, | |
10015 | .link = btrfs_link, | |
10016 | .mkdir = btrfs_mkdir, | |
10017 | .rmdir = btrfs_rmdir, | |
80ace85c | 10018 | .rename2 = btrfs_rename2, |
39279cc3 CM |
10019 | .symlink = btrfs_symlink, |
10020 | .setattr = btrfs_setattr, | |
618e21d5 | 10021 | .mknod = btrfs_mknod, |
95819c05 CH |
10022 | .setxattr = btrfs_setxattr, |
10023 | .getxattr = btrfs_getxattr, | |
5103e947 | 10024 | .listxattr = btrfs_listxattr, |
95819c05 | 10025 | .removexattr = btrfs_removexattr, |
fdebe2bd | 10026 | .permission = btrfs_permission, |
4e34e719 | 10027 | .get_acl = btrfs_get_acl, |
996a710d | 10028 | .set_acl = btrfs_set_acl, |
93fd63c2 | 10029 | .update_time = btrfs_update_time, |
ef3b9af5 | 10030 | .tmpfile = btrfs_tmpfile, |
39279cc3 | 10031 | }; |
6e1d5dcc | 10032 | static const struct inode_operations btrfs_dir_ro_inode_operations = { |
39279cc3 | 10033 | .lookup = btrfs_lookup, |
fdebe2bd | 10034 | .permission = btrfs_permission, |
4e34e719 | 10035 | .get_acl = btrfs_get_acl, |
996a710d | 10036 | .set_acl = btrfs_set_acl, |
93fd63c2 | 10037 | .update_time = btrfs_update_time, |
39279cc3 | 10038 | }; |
76dda93c | 10039 | |
828c0950 | 10040 | static const struct file_operations btrfs_dir_file_operations = { |
39279cc3 CM |
10041 | .llseek = generic_file_llseek, |
10042 | .read = generic_read_dir, | |
9cdda8d3 | 10043 | .iterate = btrfs_real_readdir, |
34287aa3 | 10044 | .unlocked_ioctl = btrfs_ioctl, |
39279cc3 | 10045 | #ifdef CONFIG_COMPAT |
34287aa3 | 10046 | .compat_ioctl = btrfs_ioctl, |
39279cc3 | 10047 | #endif |
6bf13c0c | 10048 | .release = btrfs_release_file, |
e02119d5 | 10049 | .fsync = btrfs_sync_file, |
39279cc3 CM |
10050 | }; |
10051 | ||
20e5506b | 10052 | static const struct extent_io_ops btrfs_extent_io_ops = { |
07157aac | 10053 | .fill_delalloc = run_delalloc_range, |
065631f6 | 10054 | .submit_bio_hook = btrfs_submit_bio_hook, |
239b14b3 | 10055 | .merge_bio_hook = btrfs_merge_bio_hook, |
07157aac | 10056 | .readpage_end_io_hook = btrfs_readpage_end_io_hook, |
e6dcd2dc | 10057 | .writepage_end_io_hook = btrfs_writepage_end_io_hook, |
247e743c | 10058 | .writepage_start_hook = btrfs_writepage_start_hook, |
b0c68f8b CM |
10059 | .set_bit_hook = btrfs_set_bit_hook, |
10060 | .clear_bit_hook = btrfs_clear_bit_hook, | |
9ed74f2d JB |
10061 | .merge_extent_hook = btrfs_merge_extent_hook, |
10062 | .split_extent_hook = btrfs_split_extent_hook, | |
07157aac CM |
10063 | }; |
10064 | ||
35054394 CM |
10065 | /* |
10066 | * btrfs doesn't support the bmap operation because swapfiles | |
10067 | * use bmap to make a mapping of extents in the file. They assume | |
10068 | * these extents won't change over the life of the file and they | |
10069 | * use the bmap result to do IO directly to the drive. | |
10070 | * | |
10071 | * the btrfs bmap call would return logical addresses that aren't | |
10072 | * suitable for IO and they also will change frequently as COW | |
10073 | * operations happen. So, swapfile + btrfs == corruption. | |
10074 | * | |
10075 | * For now we're avoiding this by dropping bmap. | |
10076 | */ | |
7f09410b | 10077 | static const struct address_space_operations btrfs_aops = { |
39279cc3 CM |
10078 | .readpage = btrfs_readpage, |
10079 | .writepage = btrfs_writepage, | |
b293f02e | 10080 | .writepages = btrfs_writepages, |
3ab2fb5a | 10081 | .readpages = btrfs_readpages, |
16432985 | 10082 | .direct_IO = btrfs_direct_IO, |
a52d9a80 CM |
10083 | .invalidatepage = btrfs_invalidatepage, |
10084 | .releasepage = btrfs_releasepage, | |
e6dcd2dc | 10085 | .set_page_dirty = btrfs_set_page_dirty, |
465fdd97 | 10086 | .error_remove_page = generic_error_remove_page, |
39279cc3 CM |
10087 | }; |
10088 | ||
7f09410b | 10089 | static const struct address_space_operations btrfs_symlink_aops = { |
39279cc3 CM |
10090 | .readpage = btrfs_readpage, |
10091 | .writepage = btrfs_writepage, | |
2bf5a725 CM |
10092 | .invalidatepage = btrfs_invalidatepage, |
10093 | .releasepage = btrfs_releasepage, | |
39279cc3 CM |
10094 | }; |
10095 | ||
6e1d5dcc | 10096 | static const struct inode_operations btrfs_file_inode_operations = { |
39279cc3 CM |
10097 | .getattr = btrfs_getattr, |
10098 | .setattr = btrfs_setattr, | |
95819c05 CH |
10099 | .setxattr = btrfs_setxattr, |
10100 | .getxattr = btrfs_getxattr, | |
5103e947 | 10101 | .listxattr = btrfs_listxattr, |
95819c05 | 10102 | .removexattr = btrfs_removexattr, |
fdebe2bd | 10103 | .permission = btrfs_permission, |
1506fcc8 | 10104 | .fiemap = btrfs_fiemap, |
4e34e719 | 10105 | .get_acl = btrfs_get_acl, |
996a710d | 10106 | .set_acl = btrfs_set_acl, |
e41f941a | 10107 | .update_time = btrfs_update_time, |
39279cc3 | 10108 | }; |
6e1d5dcc | 10109 | static const struct inode_operations btrfs_special_inode_operations = { |
618e21d5 JB |
10110 | .getattr = btrfs_getattr, |
10111 | .setattr = btrfs_setattr, | |
fdebe2bd | 10112 | .permission = btrfs_permission, |
95819c05 CH |
10113 | .setxattr = btrfs_setxattr, |
10114 | .getxattr = btrfs_getxattr, | |
33268eaf | 10115 | .listxattr = btrfs_listxattr, |
95819c05 | 10116 | .removexattr = btrfs_removexattr, |
4e34e719 | 10117 | .get_acl = btrfs_get_acl, |
996a710d | 10118 | .set_acl = btrfs_set_acl, |
e41f941a | 10119 | .update_time = btrfs_update_time, |
618e21d5 | 10120 | }; |
6e1d5dcc | 10121 | static const struct inode_operations btrfs_symlink_inode_operations = { |
39279cc3 CM |
10122 | .readlink = generic_readlink, |
10123 | .follow_link = page_follow_link_light, | |
10124 | .put_link = page_put_link, | |
f209561a | 10125 | .getattr = btrfs_getattr, |
22c44fe6 | 10126 | .setattr = btrfs_setattr, |
fdebe2bd | 10127 | .permission = btrfs_permission, |
0279b4cd JO |
10128 | .setxattr = btrfs_setxattr, |
10129 | .getxattr = btrfs_getxattr, | |
10130 | .listxattr = btrfs_listxattr, | |
10131 | .removexattr = btrfs_removexattr, | |
e41f941a | 10132 | .update_time = btrfs_update_time, |
39279cc3 | 10133 | }; |
76dda93c | 10134 | |
82d339d9 | 10135 | const struct dentry_operations btrfs_dentry_operations = { |
76dda93c | 10136 | .d_delete = btrfs_dentry_delete, |
b4aff1f8 | 10137 | .d_release = btrfs_dentry_release, |
76dda93c | 10138 | }; |