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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 | |
24bbcf04 | 3137 | spin_lock(&fs_info->delayed_iput_lock); |
8089fe62 DS |
3138 | while (!list_empty(&fs_info->delayed_iputs)) { |
3139 | struct btrfs_inode *inode; | |
3140 | ||
3141 | inode = list_first_entry(&fs_info->delayed_iputs, | |
3142 | struct btrfs_inode, delayed_iput); | |
3143 | if (inode->delayed_iput_count) { | |
3144 | inode->delayed_iput_count--; | |
3145 | list_move_tail(&inode->delayed_iput, | |
3146 | &fs_info->delayed_iputs); | |
3147 | } else { | |
3148 | list_del_init(&inode->delayed_iput); | |
3149 | } | |
3150 | spin_unlock(&fs_info->delayed_iput_lock); | |
3151 | iput(&inode->vfs_inode); | |
3152 | spin_lock(&fs_info->delayed_iput_lock); | |
24bbcf04 | 3153 | } |
8089fe62 | 3154 | spin_unlock(&fs_info->delayed_iput_lock); |
24bbcf04 YZ |
3155 | } |
3156 | ||
d68fc57b | 3157 | /* |
42b2aa86 | 3158 | * This is called in transaction commit time. If there are no orphan |
d68fc57b YZ |
3159 | * files in the subvolume, it removes orphan item and frees block_rsv |
3160 | * structure. | |
3161 | */ | |
3162 | void btrfs_orphan_commit_root(struct btrfs_trans_handle *trans, | |
3163 | struct btrfs_root *root) | |
3164 | { | |
90290e19 | 3165 | struct btrfs_block_rsv *block_rsv; |
d68fc57b YZ |
3166 | int ret; |
3167 | ||
8a35d95f | 3168 | if (atomic_read(&root->orphan_inodes) || |
d68fc57b YZ |
3169 | root->orphan_cleanup_state != ORPHAN_CLEANUP_DONE) |
3170 | return; | |
3171 | ||
90290e19 | 3172 | spin_lock(&root->orphan_lock); |
8a35d95f | 3173 | if (atomic_read(&root->orphan_inodes)) { |
90290e19 JB |
3174 | spin_unlock(&root->orphan_lock); |
3175 | return; | |
3176 | } | |
3177 | ||
3178 | if (root->orphan_cleanup_state != ORPHAN_CLEANUP_DONE) { | |
3179 | spin_unlock(&root->orphan_lock); | |
3180 | return; | |
3181 | } | |
3182 | ||
3183 | block_rsv = root->orphan_block_rsv; | |
3184 | root->orphan_block_rsv = NULL; | |
3185 | spin_unlock(&root->orphan_lock); | |
3186 | ||
27cdeb70 | 3187 | if (test_bit(BTRFS_ROOT_ORPHAN_ITEM_INSERTED, &root->state) && |
d68fc57b YZ |
3188 | btrfs_root_refs(&root->root_item) > 0) { |
3189 | ret = btrfs_del_orphan_item(trans, root->fs_info->tree_root, | |
3190 | root->root_key.objectid); | |
4ef31a45 JB |
3191 | if (ret) |
3192 | btrfs_abort_transaction(trans, root, ret); | |
3193 | else | |
27cdeb70 MX |
3194 | clear_bit(BTRFS_ROOT_ORPHAN_ITEM_INSERTED, |
3195 | &root->state); | |
d68fc57b YZ |
3196 | } |
3197 | ||
90290e19 JB |
3198 | if (block_rsv) { |
3199 | WARN_ON(block_rsv->size > 0); | |
3200 | btrfs_free_block_rsv(root, block_rsv); | |
d68fc57b YZ |
3201 | } |
3202 | } | |
3203 | ||
7b128766 JB |
3204 | /* |
3205 | * This creates an orphan entry for the given inode in case something goes | |
3206 | * wrong in the middle of an unlink/truncate. | |
d68fc57b YZ |
3207 | * |
3208 | * NOTE: caller of this function should reserve 5 units of metadata for | |
3209 | * this function. | |
7b128766 JB |
3210 | */ |
3211 | int btrfs_orphan_add(struct btrfs_trans_handle *trans, struct inode *inode) | |
3212 | { | |
3213 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
d68fc57b YZ |
3214 | struct btrfs_block_rsv *block_rsv = NULL; |
3215 | int reserve = 0; | |
3216 | int insert = 0; | |
3217 | int ret; | |
7b128766 | 3218 | |
d68fc57b | 3219 | if (!root->orphan_block_rsv) { |
66d8f3dd | 3220 | block_rsv = btrfs_alloc_block_rsv(root, BTRFS_BLOCK_RSV_TEMP); |
b532402e TI |
3221 | if (!block_rsv) |
3222 | return -ENOMEM; | |
d68fc57b | 3223 | } |
7b128766 | 3224 | |
d68fc57b YZ |
3225 | spin_lock(&root->orphan_lock); |
3226 | if (!root->orphan_block_rsv) { | |
3227 | root->orphan_block_rsv = block_rsv; | |
3228 | } else if (block_rsv) { | |
3229 | btrfs_free_block_rsv(root, block_rsv); | |
3230 | block_rsv = NULL; | |
7b128766 | 3231 | } |
7b128766 | 3232 | |
8a35d95f JB |
3233 | if (!test_and_set_bit(BTRFS_INODE_HAS_ORPHAN_ITEM, |
3234 | &BTRFS_I(inode)->runtime_flags)) { | |
d68fc57b YZ |
3235 | #if 0 |
3236 | /* | |
3237 | * For proper ENOSPC handling, we should do orphan | |
3238 | * cleanup when mounting. But this introduces backward | |
3239 | * compatibility issue. | |
3240 | */ | |
3241 | if (!xchg(&root->orphan_item_inserted, 1)) | |
3242 | insert = 2; | |
3243 | else | |
3244 | insert = 1; | |
3245 | #endif | |
3246 | insert = 1; | |
321f0e70 | 3247 | atomic_inc(&root->orphan_inodes); |
7b128766 JB |
3248 | } |
3249 | ||
72ac3c0d JB |
3250 | if (!test_and_set_bit(BTRFS_INODE_ORPHAN_META_RESERVED, |
3251 | &BTRFS_I(inode)->runtime_flags)) | |
d68fc57b | 3252 | reserve = 1; |
d68fc57b | 3253 | spin_unlock(&root->orphan_lock); |
7b128766 | 3254 | |
d68fc57b YZ |
3255 | /* grab metadata reservation from transaction handle */ |
3256 | if (reserve) { | |
3257 | ret = btrfs_orphan_reserve_metadata(trans, inode); | |
79787eaa | 3258 | BUG_ON(ret); /* -ENOSPC in reservation; Logic error? JDM */ |
d68fc57b | 3259 | } |
7b128766 | 3260 | |
d68fc57b YZ |
3261 | /* insert an orphan item to track this unlinked/truncated file */ |
3262 | if (insert >= 1) { | |
33345d01 | 3263 | ret = btrfs_insert_orphan_item(trans, root, btrfs_ino(inode)); |
4ef31a45 | 3264 | if (ret) { |
703c88e0 | 3265 | atomic_dec(&root->orphan_inodes); |
4ef31a45 JB |
3266 | if (reserve) { |
3267 | clear_bit(BTRFS_INODE_ORPHAN_META_RESERVED, | |
3268 | &BTRFS_I(inode)->runtime_flags); | |
3269 | btrfs_orphan_release_metadata(inode); | |
3270 | } | |
3271 | if (ret != -EEXIST) { | |
e8e7cff6 JB |
3272 | clear_bit(BTRFS_INODE_HAS_ORPHAN_ITEM, |
3273 | &BTRFS_I(inode)->runtime_flags); | |
4ef31a45 JB |
3274 | btrfs_abort_transaction(trans, root, ret); |
3275 | return ret; | |
3276 | } | |
79787eaa JM |
3277 | } |
3278 | ret = 0; | |
d68fc57b YZ |
3279 | } |
3280 | ||
3281 | /* insert an orphan item to track subvolume contains orphan files */ | |
3282 | if (insert >= 2) { | |
3283 | ret = btrfs_insert_orphan_item(trans, root->fs_info->tree_root, | |
3284 | root->root_key.objectid); | |
79787eaa JM |
3285 | if (ret && ret != -EEXIST) { |
3286 | btrfs_abort_transaction(trans, root, ret); | |
3287 | return ret; | |
3288 | } | |
d68fc57b YZ |
3289 | } |
3290 | return 0; | |
7b128766 JB |
3291 | } |
3292 | ||
3293 | /* | |
3294 | * We have done the truncate/delete so we can go ahead and remove the orphan | |
3295 | * item for this particular inode. | |
3296 | */ | |
48a3b636 ES |
3297 | static int btrfs_orphan_del(struct btrfs_trans_handle *trans, |
3298 | struct inode *inode) | |
7b128766 JB |
3299 | { |
3300 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
d68fc57b YZ |
3301 | int delete_item = 0; |
3302 | int release_rsv = 0; | |
7b128766 JB |
3303 | int ret = 0; |
3304 | ||
d68fc57b | 3305 | spin_lock(&root->orphan_lock); |
8a35d95f JB |
3306 | if (test_and_clear_bit(BTRFS_INODE_HAS_ORPHAN_ITEM, |
3307 | &BTRFS_I(inode)->runtime_flags)) | |
d68fc57b | 3308 | delete_item = 1; |
7b128766 | 3309 | |
72ac3c0d JB |
3310 | if (test_and_clear_bit(BTRFS_INODE_ORPHAN_META_RESERVED, |
3311 | &BTRFS_I(inode)->runtime_flags)) | |
d68fc57b | 3312 | release_rsv = 1; |
d68fc57b | 3313 | spin_unlock(&root->orphan_lock); |
7b128766 | 3314 | |
703c88e0 | 3315 | if (delete_item) { |
8a35d95f | 3316 | atomic_dec(&root->orphan_inodes); |
703c88e0 FDBM |
3317 | if (trans) |
3318 | ret = btrfs_del_orphan_item(trans, root, | |
3319 | btrfs_ino(inode)); | |
8a35d95f | 3320 | } |
7b128766 | 3321 | |
703c88e0 FDBM |
3322 | if (release_rsv) |
3323 | btrfs_orphan_release_metadata(inode); | |
3324 | ||
4ef31a45 | 3325 | return ret; |
7b128766 JB |
3326 | } |
3327 | ||
3328 | /* | |
3329 | * this cleans up any orphans that may be left on the list from the last use | |
3330 | * of this root. | |
3331 | */ | |
66b4ffd1 | 3332 | int btrfs_orphan_cleanup(struct btrfs_root *root) |
7b128766 JB |
3333 | { |
3334 | struct btrfs_path *path; | |
3335 | struct extent_buffer *leaf; | |
7b128766 JB |
3336 | struct btrfs_key key, found_key; |
3337 | struct btrfs_trans_handle *trans; | |
3338 | struct inode *inode; | |
8f6d7f4f | 3339 | u64 last_objectid = 0; |
7b128766 JB |
3340 | int ret = 0, nr_unlink = 0, nr_truncate = 0; |
3341 | ||
d68fc57b | 3342 | if (cmpxchg(&root->orphan_cleanup_state, 0, ORPHAN_CLEANUP_STARTED)) |
66b4ffd1 | 3343 | return 0; |
c71bf099 YZ |
3344 | |
3345 | path = btrfs_alloc_path(); | |
66b4ffd1 JB |
3346 | if (!path) { |
3347 | ret = -ENOMEM; | |
3348 | goto out; | |
3349 | } | |
e4058b54 | 3350 | path->reada = READA_BACK; |
7b128766 JB |
3351 | |
3352 | key.objectid = BTRFS_ORPHAN_OBJECTID; | |
962a298f | 3353 | key.type = BTRFS_ORPHAN_ITEM_KEY; |
7b128766 JB |
3354 | key.offset = (u64)-1; |
3355 | ||
7b128766 JB |
3356 | while (1) { |
3357 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); | |
66b4ffd1 JB |
3358 | if (ret < 0) |
3359 | goto out; | |
7b128766 JB |
3360 | |
3361 | /* | |
3362 | * if ret == 0 means we found what we were searching for, which | |
25985edc | 3363 | * is weird, but possible, so only screw with path if we didn't |
7b128766 JB |
3364 | * find the key and see if we have stuff that matches |
3365 | */ | |
3366 | if (ret > 0) { | |
66b4ffd1 | 3367 | ret = 0; |
7b128766 JB |
3368 | if (path->slots[0] == 0) |
3369 | break; | |
3370 | path->slots[0]--; | |
3371 | } | |
3372 | ||
3373 | /* pull out the item */ | |
3374 | leaf = path->nodes[0]; | |
7b128766 JB |
3375 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); |
3376 | ||
3377 | /* make sure the item matches what we want */ | |
3378 | if (found_key.objectid != BTRFS_ORPHAN_OBJECTID) | |
3379 | break; | |
962a298f | 3380 | if (found_key.type != BTRFS_ORPHAN_ITEM_KEY) |
7b128766 JB |
3381 | break; |
3382 | ||
3383 | /* release the path since we're done with it */ | |
b3b4aa74 | 3384 | btrfs_release_path(path); |
7b128766 JB |
3385 | |
3386 | /* | |
3387 | * this is where we are basically btrfs_lookup, without the | |
3388 | * crossing root thing. we store the inode number in the | |
3389 | * offset of the orphan item. | |
3390 | */ | |
8f6d7f4f JB |
3391 | |
3392 | if (found_key.offset == last_objectid) { | |
c2cf52eb SK |
3393 | btrfs_err(root->fs_info, |
3394 | "Error removing orphan entry, stopping orphan cleanup"); | |
8f6d7f4f JB |
3395 | ret = -EINVAL; |
3396 | goto out; | |
3397 | } | |
3398 | ||
3399 | last_objectid = found_key.offset; | |
3400 | ||
5d4f98a2 YZ |
3401 | found_key.objectid = found_key.offset; |
3402 | found_key.type = BTRFS_INODE_ITEM_KEY; | |
3403 | found_key.offset = 0; | |
73f73415 | 3404 | inode = btrfs_iget(root->fs_info->sb, &found_key, root, NULL); |
8c6ffba0 | 3405 | ret = PTR_ERR_OR_ZERO(inode); |
a8c9e576 | 3406 | if (ret && ret != -ESTALE) |
66b4ffd1 | 3407 | goto out; |
7b128766 | 3408 | |
f8e9e0b0 AJ |
3409 | if (ret == -ESTALE && root == root->fs_info->tree_root) { |
3410 | struct btrfs_root *dead_root; | |
3411 | struct btrfs_fs_info *fs_info = root->fs_info; | |
3412 | int is_dead_root = 0; | |
3413 | ||
3414 | /* | |
3415 | * this is an orphan in the tree root. Currently these | |
3416 | * could come from 2 sources: | |
3417 | * a) a snapshot deletion in progress | |
3418 | * b) a free space cache inode | |
3419 | * We need to distinguish those two, as the snapshot | |
3420 | * orphan must not get deleted. | |
3421 | * find_dead_roots already ran before us, so if this | |
3422 | * is a snapshot deletion, we should find the root | |
3423 | * in the dead_roots list | |
3424 | */ | |
3425 | spin_lock(&fs_info->trans_lock); | |
3426 | list_for_each_entry(dead_root, &fs_info->dead_roots, | |
3427 | root_list) { | |
3428 | if (dead_root->root_key.objectid == | |
3429 | found_key.objectid) { | |
3430 | is_dead_root = 1; | |
3431 | break; | |
3432 | } | |
3433 | } | |
3434 | spin_unlock(&fs_info->trans_lock); | |
3435 | if (is_dead_root) { | |
3436 | /* prevent this orphan from being found again */ | |
3437 | key.offset = found_key.objectid - 1; | |
3438 | continue; | |
3439 | } | |
3440 | } | |
7b128766 | 3441 | /* |
a8c9e576 JB |
3442 | * Inode is already gone but the orphan item is still there, |
3443 | * kill the orphan item. | |
7b128766 | 3444 | */ |
a8c9e576 JB |
3445 | if (ret == -ESTALE) { |
3446 | trans = btrfs_start_transaction(root, 1); | |
66b4ffd1 JB |
3447 | if (IS_ERR(trans)) { |
3448 | ret = PTR_ERR(trans); | |
3449 | goto out; | |
3450 | } | |
c2cf52eb SK |
3451 | btrfs_debug(root->fs_info, "auto deleting %Lu", |
3452 | found_key.objectid); | |
a8c9e576 JB |
3453 | ret = btrfs_del_orphan_item(trans, root, |
3454 | found_key.objectid); | |
5b21f2ed | 3455 | btrfs_end_transaction(trans, root); |
4ef31a45 JB |
3456 | if (ret) |
3457 | goto out; | |
7b128766 JB |
3458 | continue; |
3459 | } | |
3460 | ||
a8c9e576 JB |
3461 | /* |
3462 | * add this inode to the orphan list so btrfs_orphan_del does | |
3463 | * the proper thing when we hit it | |
3464 | */ | |
8a35d95f JB |
3465 | set_bit(BTRFS_INODE_HAS_ORPHAN_ITEM, |
3466 | &BTRFS_I(inode)->runtime_flags); | |
925396ec | 3467 | atomic_inc(&root->orphan_inodes); |
a8c9e576 | 3468 | |
7b128766 JB |
3469 | /* if we have links, this was a truncate, lets do that */ |
3470 | if (inode->i_nlink) { | |
fae7f21c | 3471 | if (WARN_ON(!S_ISREG(inode->i_mode))) { |
a41ad394 JB |
3472 | iput(inode); |
3473 | continue; | |
3474 | } | |
7b128766 | 3475 | nr_truncate++; |
f3fe820c JB |
3476 | |
3477 | /* 1 for the orphan item deletion. */ | |
3478 | trans = btrfs_start_transaction(root, 1); | |
3479 | if (IS_ERR(trans)) { | |
c69b26b0 | 3480 | iput(inode); |
f3fe820c JB |
3481 | ret = PTR_ERR(trans); |
3482 | goto out; | |
3483 | } | |
3484 | ret = btrfs_orphan_add(trans, inode); | |
3485 | btrfs_end_transaction(trans, root); | |
c69b26b0 JB |
3486 | if (ret) { |
3487 | iput(inode); | |
f3fe820c | 3488 | goto out; |
c69b26b0 | 3489 | } |
f3fe820c | 3490 | |
66b4ffd1 | 3491 | ret = btrfs_truncate(inode); |
4a7d0f68 JB |
3492 | if (ret) |
3493 | btrfs_orphan_del(NULL, inode); | |
7b128766 JB |
3494 | } else { |
3495 | nr_unlink++; | |
3496 | } | |
3497 | ||
3498 | /* this will do delete_inode and everything for us */ | |
3499 | iput(inode); | |
66b4ffd1 JB |
3500 | if (ret) |
3501 | goto out; | |
7b128766 | 3502 | } |
3254c876 MX |
3503 | /* release the path since we're done with it */ |
3504 | btrfs_release_path(path); | |
3505 | ||
d68fc57b YZ |
3506 | root->orphan_cleanup_state = ORPHAN_CLEANUP_DONE; |
3507 | ||
3508 | if (root->orphan_block_rsv) | |
3509 | btrfs_block_rsv_release(root, root->orphan_block_rsv, | |
3510 | (u64)-1); | |
3511 | ||
27cdeb70 MX |
3512 | if (root->orphan_block_rsv || |
3513 | test_bit(BTRFS_ROOT_ORPHAN_ITEM_INSERTED, &root->state)) { | |
7a7eaa40 | 3514 | trans = btrfs_join_transaction(root); |
66b4ffd1 JB |
3515 | if (!IS_ERR(trans)) |
3516 | btrfs_end_transaction(trans, root); | |
d68fc57b | 3517 | } |
7b128766 JB |
3518 | |
3519 | if (nr_unlink) | |
4884b476 | 3520 | btrfs_debug(root->fs_info, "unlinked %d orphans", nr_unlink); |
7b128766 | 3521 | if (nr_truncate) |
4884b476 | 3522 | btrfs_debug(root->fs_info, "truncated %d orphans", nr_truncate); |
66b4ffd1 JB |
3523 | |
3524 | out: | |
3525 | if (ret) | |
68b663d1 | 3526 | btrfs_err(root->fs_info, |
c2cf52eb | 3527 | "could not do orphan cleanup %d", ret); |
66b4ffd1 JB |
3528 | btrfs_free_path(path); |
3529 | return ret; | |
7b128766 JB |
3530 | } |
3531 | ||
46a53cca CM |
3532 | /* |
3533 | * very simple check to peek ahead in the leaf looking for xattrs. If we | |
3534 | * don't find any xattrs, we know there can't be any acls. | |
3535 | * | |
3536 | * slot is the slot the inode is in, objectid is the objectid of the inode | |
3537 | */ | |
3538 | static noinline int acls_after_inode_item(struct extent_buffer *leaf, | |
63541927 FDBM |
3539 | int slot, u64 objectid, |
3540 | int *first_xattr_slot) | |
46a53cca CM |
3541 | { |
3542 | u32 nritems = btrfs_header_nritems(leaf); | |
3543 | struct btrfs_key found_key; | |
f23b5a59 JB |
3544 | static u64 xattr_access = 0; |
3545 | static u64 xattr_default = 0; | |
46a53cca CM |
3546 | int scanned = 0; |
3547 | ||
f23b5a59 JB |
3548 | if (!xattr_access) { |
3549 | xattr_access = btrfs_name_hash(POSIX_ACL_XATTR_ACCESS, | |
3550 | strlen(POSIX_ACL_XATTR_ACCESS)); | |
3551 | xattr_default = btrfs_name_hash(POSIX_ACL_XATTR_DEFAULT, | |
3552 | strlen(POSIX_ACL_XATTR_DEFAULT)); | |
3553 | } | |
3554 | ||
46a53cca | 3555 | slot++; |
63541927 | 3556 | *first_xattr_slot = -1; |
46a53cca CM |
3557 | while (slot < nritems) { |
3558 | btrfs_item_key_to_cpu(leaf, &found_key, slot); | |
3559 | ||
3560 | /* we found a different objectid, there must not be acls */ | |
3561 | if (found_key.objectid != objectid) | |
3562 | return 0; | |
3563 | ||
3564 | /* we found an xattr, assume we've got an acl */ | |
f23b5a59 | 3565 | if (found_key.type == BTRFS_XATTR_ITEM_KEY) { |
63541927 FDBM |
3566 | if (*first_xattr_slot == -1) |
3567 | *first_xattr_slot = slot; | |
f23b5a59 JB |
3568 | if (found_key.offset == xattr_access || |
3569 | found_key.offset == xattr_default) | |
3570 | return 1; | |
3571 | } | |
46a53cca CM |
3572 | |
3573 | /* | |
3574 | * we found a key greater than an xattr key, there can't | |
3575 | * be any acls later on | |
3576 | */ | |
3577 | if (found_key.type > BTRFS_XATTR_ITEM_KEY) | |
3578 | return 0; | |
3579 | ||
3580 | slot++; | |
3581 | scanned++; | |
3582 | ||
3583 | /* | |
3584 | * it goes inode, inode backrefs, xattrs, extents, | |
3585 | * so if there are a ton of hard links to an inode there can | |
3586 | * be a lot of backrefs. Don't waste time searching too hard, | |
3587 | * this is just an optimization | |
3588 | */ | |
3589 | if (scanned >= 8) | |
3590 | break; | |
3591 | } | |
3592 | /* we hit the end of the leaf before we found an xattr or | |
3593 | * something larger than an xattr. We have to assume the inode | |
3594 | * has acls | |
3595 | */ | |
63541927 FDBM |
3596 | if (*first_xattr_slot == -1) |
3597 | *first_xattr_slot = slot; | |
46a53cca CM |
3598 | return 1; |
3599 | } | |
3600 | ||
d352ac68 CM |
3601 | /* |
3602 | * read an inode from the btree into the in-memory inode | |
3603 | */ | |
5d4f98a2 | 3604 | static void btrfs_read_locked_inode(struct inode *inode) |
39279cc3 CM |
3605 | { |
3606 | struct btrfs_path *path; | |
5f39d397 | 3607 | struct extent_buffer *leaf; |
39279cc3 CM |
3608 | struct btrfs_inode_item *inode_item; |
3609 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
3610 | struct btrfs_key location; | |
67de1176 | 3611 | unsigned long ptr; |
46a53cca | 3612 | int maybe_acls; |
618e21d5 | 3613 | u32 rdev; |
39279cc3 | 3614 | int ret; |
2f7e33d4 | 3615 | bool filled = false; |
63541927 | 3616 | int first_xattr_slot; |
2f7e33d4 MX |
3617 | |
3618 | ret = btrfs_fill_inode(inode, &rdev); | |
3619 | if (!ret) | |
3620 | filled = true; | |
39279cc3 CM |
3621 | |
3622 | path = btrfs_alloc_path(); | |
1748f843 MF |
3623 | if (!path) |
3624 | goto make_bad; | |
3625 | ||
39279cc3 | 3626 | memcpy(&location, &BTRFS_I(inode)->location, sizeof(location)); |
dc17ff8f | 3627 | |
39279cc3 | 3628 | ret = btrfs_lookup_inode(NULL, root, path, &location, 0); |
5f39d397 | 3629 | if (ret) |
39279cc3 | 3630 | goto make_bad; |
39279cc3 | 3631 | |
5f39d397 | 3632 | leaf = path->nodes[0]; |
2f7e33d4 MX |
3633 | |
3634 | if (filled) | |
67de1176 | 3635 | goto cache_index; |
2f7e33d4 | 3636 | |
5f39d397 CM |
3637 | inode_item = btrfs_item_ptr(leaf, path->slots[0], |
3638 | struct btrfs_inode_item); | |
5f39d397 | 3639 | inode->i_mode = btrfs_inode_mode(leaf, inode_item); |
bfe86848 | 3640 | set_nlink(inode, btrfs_inode_nlink(leaf, inode_item)); |
2f2f43d3 EB |
3641 | i_uid_write(inode, btrfs_inode_uid(leaf, inode_item)); |
3642 | i_gid_write(inode, btrfs_inode_gid(leaf, inode_item)); | |
dbe674a9 | 3643 | btrfs_i_size_write(inode, btrfs_inode_size(leaf, inode_item)); |
5f39d397 | 3644 | |
a937b979 DS |
3645 | inode->i_atime.tv_sec = btrfs_timespec_sec(leaf, &inode_item->atime); |
3646 | inode->i_atime.tv_nsec = btrfs_timespec_nsec(leaf, &inode_item->atime); | |
5f39d397 | 3647 | |
a937b979 DS |
3648 | inode->i_mtime.tv_sec = btrfs_timespec_sec(leaf, &inode_item->mtime); |
3649 | inode->i_mtime.tv_nsec = btrfs_timespec_nsec(leaf, &inode_item->mtime); | |
5f39d397 | 3650 | |
a937b979 DS |
3651 | inode->i_ctime.tv_sec = btrfs_timespec_sec(leaf, &inode_item->ctime); |
3652 | inode->i_ctime.tv_nsec = btrfs_timespec_nsec(leaf, &inode_item->ctime); | |
5f39d397 | 3653 | |
9cc97d64 | 3654 | BTRFS_I(inode)->i_otime.tv_sec = |
3655 | btrfs_timespec_sec(leaf, &inode_item->otime); | |
3656 | BTRFS_I(inode)->i_otime.tv_nsec = | |
3657 | btrfs_timespec_nsec(leaf, &inode_item->otime); | |
5f39d397 | 3658 | |
a76a3cd4 | 3659 | inode_set_bytes(inode, btrfs_inode_nbytes(leaf, inode_item)); |
e02119d5 | 3660 | BTRFS_I(inode)->generation = btrfs_inode_generation(leaf, inode_item); |
5dc562c5 JB |
3661 | BTRFS_I(inode)->last_trans = btrfs_inode_transid(leaf, inode_item); |
3662 | ||
6e17d30b YD |
3663 | inode->i_version = btrfs_inode_sequence(leaf, inode_item); |
3664 | inode->i_generation = BTRFS_I(inode)->generation; | |
3665 | inode->i_rdev = 0; | |
3666 | rdev = btrfs_inode_rdev(leaf, inode_item); | |
3667 | ||
3668 | BTRFS_I(inode)->index_cnt = (u64)-1; | |
3669 | BTRFS_I(inode)->flags = btrfs_inode_flags(leaf, inode_item); | |
3670 | ||
3671 | cache_index: | |
5dc562c5 JB |
3672 | /* |
3673 | * If we were modified in the current generation and evicted from memory | |
3674 | * and then re-read we need to do a full sync since we don't have any | |
3675 | * idea about which extents were modified before we were evicted from | |
3676 | * cache. | |
6e17d30b YD |
3677 | * |
3678 | * This is required for both inode re-read from disk and delayed inode | |
3679 | * in delayed_nodes_tree. | |
5dc562c5 JB |
3680 | */ |
3681 | if (BTRFS_I(inode)->last_trans == root->fs_info->generation) | |
3682 | set_bit(BTRFS_INODE_NEEDS_FULL_SYNC, | |
3683 | &BTRFS_I(inode)->runtime_flags); | |
3684 | ||
bde6c242 FM |
3685 | /* |
3686 | * We don't persist the id of the transaction where an unlink operation | |
3687 | * against the inode was last made. So here we assume the inode might | |
3688 | * have been evicted, and therefore the exact value of last_unlink_trans | |
3689 | * lost, and set it to last_trans to avoid metadata inconsistencies | |
3690 | * between the inode and its parent if the inode is fsync'ed and the log | |
3691 | * replayed. For example, in the scenario: | |
3692 | * | |
3693 | * touch mydir/foo | |
3694 | * ln mydir/foo mydir/bar | |
3695 | * sync | |
3696 | * unlink mydir/bar | |
3697 | * echo 2 > /proc/sys/vm/drop_caches # evicts inode | |
3698 | * xfs_io -c fsync mydir/foo | |
3699 | * <power failure> | |
3700 | * mount fs, triggers fsync log replay | |
3701 | * | |
3702 | * We must make sure that when we fsync our inode foo we also log its | |
3703 | * parent inode, otherwise after log replay the parent still has the | |
3704 | * dentry with the "bar" name but our inode foo has a link count of 1 | |
3705 | * and doesn't have an inode ref with the name "bar" anymore. | |
3706 | * | |
3707 | * Setting last_unlink_trans to last_trans is a pessimistic approach, | |
3708 | * but it guarantees correctness at the expense of ocassional full | |
3709 | * transaction commits on fsync if our inode is a directory, or if our | |
3710 | * inode is not a directory, logging its parent unnecessarily. | |
3711 | */ | |
3712 | BTRFS_I(inode)->last_unlink_trans = BTRFS_I(inode)->last_trans; | |
3713 | ||
67de1176 MX |
3714 | path->slots[0]++; |
3715 | if (inode->i_nlink != 1 || | |
3716 | path->slots[0] >= btrfs_header_nritems(leaf)) | |
3717 | goto cache_acl; | |
3718 | ||
3719 | btrfs_item_key_to_cpu(leaf, &location, path->slots[0]); | |
3720 | if (location.objectid != btrfs_ino(inode)) | |
3721 | goto cache_acl; | |
3722 | ||
3723 | ptr = btrfs_item_ptr_offset(leaf, path->slots[0]); | |
3724 | if (location.type == BTRFS_INODE_REF_KEY) { | |
3725 | struct btrfs_inode_ref *ref; | |
3726 | ||
3727 | ref = (struct btrfs_inode_ref *)ptr; | |
3728 | BTRFS_I(inode)->dir_index = btrfs_inode_ref_index(leaf, ref); | |
3729 | } else if (location.type == BTRFS_INODE_EXTREF_KEY) { | |
3730 | struct btrfs_inode_extref *extref; | |
3731 | ||
3732 | extref = (struct btrfs_inode_extref *)ptr; | |
3733 | BTRFS_I(inode)->dir_index = btrfs_inode_extref_index(leaf, | |
3734 | extref); | |
3735 | } | |
2f7e33d4 | 3736 | cache_acl: |
46a53cca CM |
3737 | /* |
3738 | * try to precache a NULL acl entry for files that don't have | |
3739 | * any xattrs or acls | |
3740 | */ | |
33345d01 | 3741 | maybe_acls = acls_after_inode_item(leaf, path->slots[0], |
63541927 FDBM |
3742 | btrfs_ino(inode), &first_xattr_slot); |
3743 | if (first_xattr_slot != -1) { | |
3744 | path->slots[0] = first_xattr_slot; | |
3745 | ret = btrfs_load_inode_props(inode, path); | |
3746 | if (ret) | |
3747 | btrfs_err(root->fs_info, | |
351fd353 | 3748 | "error loading props for ino %llu (root %llu): %d", |
63541927 FDBM |
3749 | btrfs_ino(inode), |
3750 | root->root_key.objectid, ret); | |
3751 | } | |
3752 | btrfs_free_path(path); | |
3753 | ||
72c04902 AV |
3754 | if (!maybe_acls) |
3755 | cache_no_acl(inode); | |
46a53cca | 3756 | |
39279cc3 | 3757 | switch (inode->i_mode & S_IFMT) { |
39279cc3 CM |
3758 | case S_IFREG: |
3759 | inode->i_mapping->a_ops = &btrfs_aops; | |
d1310b2e | 3760 | BTRFS_I(inode)->io_tree.ops = &btrfs_extent_io_ops; |
39279cc3 CM |
3761 | inode->i_fop = &btrfs_file_operations; |
3762 | inode->i_op = &btrfs_file_inode_operations; | |
3763 | break; | |
3764 | case S_IFDIR: | |
3765 | inode->i_fop = &btrfs_dir_file_operations; | |
3766 | if (root == root->fs_info->tree_root) | |
3767 | inode->i_op = &btrfs_dir_ro_inode_operations; | |
3768 | else | |
3769 | inode->i_op = &btrfs_dir_inode_operations; | |
3770 | break; | |
3771 | case S_IFLNK: | |
3772 | inode->i_op = &btrfs_symlink_inode_operations; | |
3773 | inode->i_mapping->a_ops = &btrfs_symlink_aops; | |
3774 | break; | |
618e21d5 | 3775 | default: |
0279b4cd | 3776 | inode->i_op = &btrfs_special_inode_operations; |
618e21d5 JB |
3777 | init_special_inode(inode, inode->i_mode, rdev); |
3778 | break; | |
39279cc3 | 3779 | } |
6cbff00f CH |
3780 | |
3781 | btrfs_update_iflags(inode); | |
39279cc3 CM |
3782 | return; |
3783 | ||
3784 | make_bad: | |
39279cc3 | 3785 | btrfs_free_path(path); |
39279cc3 CM |
3786 | make_bad_inode(inode); |
3787 | } | |
3788 | ||
d352ac68 CM |
3789 | /* |
3790 | * given a leaf and an inode, copy the inode fields into the leaf | |
3791 | */ | |
e02119d5 CM |
3792 | static void fill_inode_item(struct btrfs_trans_handle *trans, |
3793 | struct extent_buffer *leaf, | |
5f39d397 | 3794 | struct btrfs_inode_item *item, |
39279cc3 CM |
3795 | struct inode *inode) |
3796 | { | |
51fab693 LB |
3797 | struct btrfs_map_token token; |
3798 | ||
3799 | btrfs_init_map_token(&token); | |
5f39d397 | 3800 | |
51fab693 LB |
3801 | btrfs_set_token_inode_uid(leaf, item, i_uid_read(inode), &token); |
3802 | btrfs_set_token_inode_gid(leaf, item, i_gid_read(inode), &token); | |
3803 | btrfs_set_token_inode_size(leaf, item, BTRFS_I(inode)->disk_i_size, | |
3804 | &token); | |
3805 | btrfs_set_token_inode_mode(leaf, item, inode->i_mode, &token); | |
3806 | btrfs_set_token_inode_nlink(leaf, item, inode->i_nlink, &token); | |
5f39d397 | 3807 | |
a937b979 | 3808 | btrfs_set_token_timespec_sec(leaf, &item->atime, |
51fab693 | 3809 | inode->i_atime.tv_sec, &token); |
a937b979 | 3810 | btrfs_set_token_timespec_nsec(leaf, &item->atime, |
51fab693 | 3811 | inode->i_atime.tv_nsec, &token); |
5f39d397 | 3812 | |
a937b979 | 3813 | btrfs_set_token_timespec_sec(leaf, &item->mtime, |
51fab693 | 3814 | inode->i_mtime.tv_sec, &token); |
a937b979 | 3815 | btrfs_set_token_timespec_nsec(leaf, &item->mtime, |
51fab693 | 3816 | inode->i_mtime.tv_nsec, &token); |
5f39d397 | 3817 | |
a937b979 | 3818 | btrfs_set_token_timespec_sec(leaf, &item->ctime, |
51fab693 | 3819 | inode->i_ctime.tv_sec, &token); |
a937b979 | 3820 | btrfs_set_token_timespec_nsec(leaf, &item->ctime, |
51fab693 | 3821 | inode->i_ctime.tv_nsec, &token); |
5f39d397 | 3822 | |
9cc97d64 | 3823 | btrfs_set_token_timespec_sec(leaf, &item->otime, |
3824 | BTRFS_I(inode)->i_otime.tv_sec, &token); | |
3825 | btrfs_set_token_timespec_nsec(leaf, &item->otime, | |
3826 | BTRFS_I(inode)->i_otime.tv_nsec, &token); | |
3827 | ||
51fab693 LB |
3828 | btrfs_set_token_inode_nbytes(leaf, item, inode_get_bytes(inode), |
3829 | &token); | |
3830 | btrfs_set_token_inode_generation(leaf, item, BTRFS_I(inode)->generation, | |
3831 | &token); | |
3832 | btrfs_set_token_inode_sequence(leaf, item, inode->i_version, &token); | |
3833 | btrfs_set_token_inode_transid(leaf, item, trans->transid, &token); | |
3834 | btrfs_set_token_inode_rdev(leaf, item, inode->i_rdev, &token); | |
3835 | btrfs_set_token_inode_flags(leaf, item, BTRFS_I(inode)->flags, &token); | |
3836 | btrfs_set_token_inode_block_group(leaf, item, 0, &token); | |
39279cc3 CM |
3837 | } |
3838 | ||
d352ac68 CM |
3839 | /* |
3840 | * copy everything in the in-memory inode into the btree. | |
3841 | */ | |
2115133f | 3842 | static noinline int btrfs_update_inode_item(struct btrfs_trans_handle *trans, |
d397712b | 3843 | struct btrfs_root *root, struct inode *inode) |
39279cc3 CM |
3844 | { |
3845 | struct btrfs_inode_item *inode_item; | |
3846 | struct btrfs_path *path; | |
5f39d397 | 3847 | struct extent_buffer *leaf; |
39279cc3 CM |
3848 | int ret; |
3849 | ||
3850 | path = btrfs_alloc_path(); | |
16cdcec7 MX |
3851 | if (!path) |
3852 | return -ENOMEM; | |
3853 | ||
b9473439 | 3854 | path->leave_spinning = 1; |
16cdcec7 MX |
3855 | ret = btrfs_lookup_inode(trans, root, path, &BTRFS_I(inode)->location, |
3856 | 1); | |
39279cc3 CM |
3857 | if (ret) { |
3858 | if (ret > 0) | |
3859 | ret = -ENOENT; | |
3860 | goto failed; | |
3861 | } | |
3862 | ||
5f39d397 CM |
3863 | leaf = path->nodes[0]; |
3864 | inode_item = btrfs_item_ptr(leaf, path->slots[0], | |
16cdcec7 | 3865 | struct btrfs_inode_item); |
39279cc3 | 3866 | |
e02119d5 | 3867 | fill_inode_item(trans, leaf, inode_item, inode); |
5f39d397 | 3868 | btrfs_mark_buffer_dirty(leaf); |
15ee9bc7 | 3869 | btrfs_set_inode_last_trans(trans, inode); |
39279cc3 CM |
3870 | ret = 0; |
3871 | failed: | |
39279cc3 CM |
3872 | btrfs_free_path(path); |
3873 | return ret; | |
3874 | } | |
3875 | ||
2115133f CM |
3876 | /* |
3877 | * copy everything in the in-memory inode into the btree. | |
3878 | */ | |
3879 | noinline int btrfs_update_inode(struct btrfs_trans_handle *trans, | |
3880 | struct btrfs_root *root, struct inode *inode) | |
3881 | { | |
3882 | int ret; | |
3883 | ||
3884 | /* | |
3885 | * If the inode is a free space inode, we can deadlock during commit | |
3886 | * if we put it into the delayed code. | |
3887 | * | |
3888 | * The data relocation inode should also be directly updated | |
3889 | * without delay | |
3890 | */ | |
83eea1f1 | 3891 | if (!btrfs_is_free_space_inode(inode) |
1d52c78a JB |
3892 | && root->root_key.objectid != BTRFS_DATA_RELOC_TREE_OBJECTID |
3893 | && !root->fs_info->log_root_recovering) { | |
8ea05e3a AB |
3894 | btrfs_update_root_times(trans, root); |
3895 | ||
2115133f CM |
3896 | ret = btrfs_delayed_update_inode(trans, root, inode); |
3897 | if (!ret) | |
3898 | btrfs_set_inode_last_trans(trans, inode); | |
3899 | return ret; | |
3900 | } | |
3901 | ||
3902 | return btrfs_update_inode_item(trans, root, inode); | |
3903 | } | |
3904 | ||
be6aef60 JB |
3905 | noinline int btrfs_update_inode_fallback(struct btrfs_trans_handle *trans, |
3906 | struct btrfs_root *root, | |
3907 | struct inode *inode) | |
2115133f CM |
3908 | { |
3909 | int ret; | |
3910 | ||
3911 | ret = btrfs_update_inode(trans, root, inode); | |
3912 | if (ret == -ENOSPC) | |
3913 | return btrfs_update_inode_item(trans, root, inode); | |
3914 | return ret; | |
3915 | } | |
3916 | ||
d352ac68 CM |
3917 | /* |
3918 | * unlink helper that gets used here in inode.c and in the tree logging | |
3919 | * recovery code. It remove a link in a directory with a given name, and | |
3920 | * also drops the back refs in the inode to the directory | |
3921 | */ | |
92986796 AV |
3922 | static int __btrfs_unlink_inode(struct btrfs_trans_handle *trans, |
3923 | struct btrfs_root *root, | |
3924 | struct inode *dir, struct inode *inode, | |
3925 | const char *name, int name_len) | |
39279cc3 CM |
3926 | { |
3927 | struct btrfs_path *path; | |
39279cc3 | 3928 | int ret = 0; |
5f39d397 | 3929 | struct extent_buffer *leaf; |
39279cc3 | 3930 | struct btrfs_dir_item *di; |
5f39d397 | 3931 | struct btrfs_key key; |
aec7477b | 3932 | u64 index; |
33345d01 LZ |
3933 | u64 ino = btrfs_ino(inode); |
3934 | u64 dir_ino = btrfs_ino(dir); | |
39279cc3 CM |
3935 | |
3936 | path = btrfs_alloc_path(); | |
54aa1f4d CM |
3937 | if (!path) { |
3938 | ret = -ENOMEM; | |
554233a6 | 3939 | goto out; |
54aa1f4d CM |
3940 | } |
3941 | ||
b9473439 | 3942 | path->leave_spinning = 1; |
33345d01 | 3943 | di = btrfs_lookup_dir_item(trans, root, path, dir_ino, |
39279cc3 CM |
3944 | name, name_len, -1); |
3945 | if (IS_ERR(di)) { | |
3946 | ret = PTR_ERR(di); | |
3947 | goto err; | |
3948 | } | |
3949 | if (!di) { | |
3950 | ret = -ENOENT; | |
3951 | goto err; | |
3952 | } | |
5f39d397 CM |
3953 | leaf = path->nodes[0]; |
3954 | btrfs_dir_item_key_to_cpu(leaf, di, &key); | |
39279cc3 | 3955 | ret = btrfs_delete_one_dir_name(trans, root, path, di); |
54aa1f4d CM |
3956 | if (ret) |
3957 | goto err; | |
b3b4aa74 | 3958 | btrfs_release_path(path); |
39279cc3 | 3959 | |
67de1176 MX |
3960 | /* |
3961 | * If we don't have dir index, we have to get it by looking up | |
3962 | * the inode ref, since we get the inode ref, remove it directly, | |
3963 | * it is unnecessary to do delayed deletion. | |
3964 | * | |
3965 | * But if we have dir index, needn't search inode ref to get it. | |
3966 | * Since the inode ref is close to the inode item, it is better | |
3967 | * that we delay to delete it, and just do this deletion when | |
3968 | * we update the inode item. | |
3969 | */ | |
3970 | if (BTRFS_I(inode)->dir_index) { | |
3971 | ret = btrfs_delayed_delete_inode_ref(inode); | |
3972 | if (!ret) { | |
3973 | index = BTRFS_I(inode)->dir_index; | |
3974 | goto skip_backref; | |
3975 | } | |
3976 | } | |
3977 | ||
33345d01 LZ |
3978 | ret = btrfs_del_inode_ref(trans, root, name, name_len, ino, |
3979 | dir_ino, &index); | |
aec7477b | 3980 | if (ret) { |
c2cf52eb SK |
3981 | btrfs_info(root->fs_info, |
3982 | "failed to delete reference to %.*s, inode %llu parent %llu", | |
c1c9ff7c | 3983 | name_len, name, ino, dir_ino); |
79787eaa | 3984 | btrfs_abort_transaction(trans, root, ret); |
aec7477b JB |
3985 | goto err; |
3986 | } | |
67de1176 | 3987 | skip_backref: |
16cdcec7 | 3988 | ret = btrfs_delete_delayed_dir_index(trans, root, dir, index); |
79787eaa JM |
3989 | if (ret) { |
3990 | btrfs_abort_transaction(trans, root, ret); | |
39279cc3 | 3991 | goto err; |
79787eaa | 3992 | } |
39279cc3 | 3993 | |
e02119d5 | 3994 | ret = btrfs_del_inode_ref_in_log(trans, root, name, name_len, |
33345d01 | 3995 | inode, dir_ino); |
79787eaa JM |
3996 | if (ret != 0 && ret != -ENOENT) { |
3997 | btrfs_abort_transaction(trans, root, ret); | |
3998 | goto err; | |
3999 | } | |
e02119d5 CM |
4000 | |
4001 | ret = btrfs_del_dir_entries_in_log(trans, root, name, name_len, | |
4002 | dir, index); | |
6418c961 CM |
4003 | if (ret == -ENOENT) |
4004 | ret = 0; | |
d4e3991b ZB |
4005 | else if (ret) |
4006 | btrfs_abort_transaction(trans, root, ret); | |
39279cc3 CM |
4007 | err: |
4008 | btrfs_free_path(path); | |
e02119d5 CM |
4009 | if (ret) |
4010 | goto out; | |
4011 | ||
4012 | btrfs_i_size_write(dir, dir->i_size - name_len * 2); | |
0c4d2d95 JB |
4013 | inode_inc_iversion(inode); |
4014 | inode_inc_iversion(dir); | |
e02119d5 | 4015 | inode->i_ctime = dir->i_mtime = dir->i_ctime = CURRENT_TIME; |
b9959295 | 4016 | ret = btrfs_update_inode(trans, root, dir); |
e02119d5 | 4017 | out: |
39279cc3 CM |
4018 | return ret; |
4019 | } | |
4020 | ||
92986796 AV |
4021 | int btrfs_unlink_inode(struct btrfs_trans_handle *trans, |
4022 | struct btrfs_root *root, | |
4023 | struct inode *dir, struct inode *inode, | |
4024 | const char *name, int name_len) | |
4025 | { | |
4026 | int ret; | |
4027 | ret = __btrfs_unlink_inode(trans, root, dir, inode, name, name_len); | |
4028 | if (!ret) { | |
8b558c5f | 4029 | drop_nlink(inode); |
92986796 AV |
4030 | ret = btrfs_update_inode(trans, root, inode); |
4031 | } | |
4032 | return ret; | |
4033 | } | |
39279cc3 | 4034 | |
a22285a6 YZ |
4035 | /* |
4036 | * helper to start transaction for unlink and rmdir. | |
4037 | * | |
d52be818 JB |
4038 | * unlink and rmdir are special in btrfs, they do not always free space, so |
4039 | * if we cannot make our reservations the normal way try and see if there is | |
4040 | * plenty of slack room in the global reserve to migrate, otherwise we cannot | |
4041 | * allow the unlink to occur. | |
a22285a6 | 4042 | */ |
d52be818 | 4043 | static struct btrfs_trans_handle *__unlink_start_trans(struct inode *dir) |
4df27c4d | 4044 | { |
a22285a6 | 4045 | struct btrfs_root *root = BTRFS_I(dir)->root; |
4df27c4d | 4046 | |
e70bea5f JB |
4047 | /* |
4048 | * 1 for the possible orphan item | |
4049 | * 1 for the dir item | |
4050 | * 1 for the dir index | |
4051 | * 1 for the inode ref | |
e70bea5f JB |
4052 | * 1 for the inode |
4053 | */ | |
8eab77ff | 4054 | return btrfs_start_transaction_fallback_global_rsv(root, 5, 5); |
a22285a6 YZ |
4055 | } |
4056 | ||
4057 | static int btrfs_unlink(struct inode *dir, struct dentry *dentry) | |
4058 | { | |
4059 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
4060 | struct btrfs_trans_handle *trans; | |
2b0143b5 | 4061 | struct inode *inode = d_inode(dentry); |
a22285a6 | 4062 | int ret; |
a22285a6 | 4063 | |
d52be818 | 4064 | trans = __unlink_start_trans(dir); |
a22285a6 YZ |
4065 | if (IS_ERR(trans)) |
4066 | return PTR_ERR(trans); | |
5f39d397 | 4067 | |
2b0143b5 | 4068 | btrfs_record_unlink_dir(trans, dir, d_inode(dentry), 0); |
12fcfd22 | 4069 | |
2b0143b5 | 4070 | ret = btrfs_unlink_inode(trans, root, dir, d_inode(dentry), |
e02119d5 | 4071 | dentry->d_name.name, dentry->d_name.len); |
b532402e TI |
4072 | if (ret) |
4073 | goto out; | |
7b128766 | 4074 | |
a22285a6 | 4075 | if (inode->i_nlink == 0) { |
7b128766 | 4076 | ret = btrfs_orphan_add(trans, inode); |
b532402e TI |
4077 | if (ret) |
4078 | goto out; | |
a22285a6 | 4079 | } |
7b128766 | 4080 | |
b532402e | 4081 | out: |
d52be818 | 4082 | btrfs_end_transaction(trans, root); |
b53d3f5d | 4083 | btrfs_btree_balance_dirty(root); |
39279cc3 CM |
4084 | return ret; |
4085 | } | |
4086 | ||
4df27c4d YZ |
4087 | int btrfs_unlink_subvol(struct btrfs_trans_handle *trans, |
4088 | struct btrfs_root *root, | |
4089 | struct inode *dir, u64 objectid, | |
4090 | const char *name, int name_len) | |
4091 | { | |
4092 | struct btrfs_path *path; | |
4093 | struct extent_buffer *leaf; | |
4094 | struct btrfs_dir_item *di; | |
4095 | struct btrfs_key key; | |
4096 | u64 index; | |
4097 | int ret; | |
33345d01 | 4098 | u64 dir_ino = btrfs_ino(dir); |
4df27c4d YZ |
4099 | |
4100 | path = btrfs_alloc_path(); | |
4101 | if (!path) | |
4102 | return -ENOMEM; | |
4103 | ||
33345d01 | 4104 | di = btrfs_lookup_dir_item(trans, root, path, dir_ino, |
4df27c4d | 4105 | name, name_len, -1); |
79787eaa JM |
4106 | if (IS_ERR_OR_NULL(di)) { |
4107 | if (!di) | |
4108 | ret = -ENOENT; | |
4109 | else | |
4110 | ret = PTR_ERR(di); | |
4111 | goto out; | |
4112 | } | |
4df27c4d YZ |
4113 | |
4114 | leaf = path->nodes[0]; | |
4115 | btrfs_dir_item_key_to_cpu(leaf, di, &key); | |
4116 | WARN_ON(key.type != BTRFS_ROOT_ITEM_KEY || key.objectid != objectid); | |
4117 | ret = btrfs_delete_one_dir_name(trans, root, path, di); | |
79787eaa JM |
4118 | if (ret) { |
4119 | btrfs_abort_transaction(trans, root, ret); | |
4120 | goto out; | |
4121 | } | |
b3b4aa74 | 4122 | btrfs_release_path(path); |
4df27c4d YZ |
4123 | |
4124 | ret = btrfs_del_root_ref(trans, root->fs_info->tree_root, | |
4125 | objectid, root->root_key.objectid, | |
33345d01 | 4126 | dir_ino, &index, name, name_len); |
4df27c4d | 4127 | if (ret < 0) { |
79787eaa JM |
4128 | if (ret != -ENOENT) { |
4129 | btrfs_abort_transaction(trans, root, ret); | |
4130 | goto out; | |
4131 | } | |
33345d01 | 4132 | di = btrfs_search_dir_index_item(root, path, dir_ino, |
4df27c4d | 4133 | name, name_len); |
79787eaa JM |
4134 | if (IS_ERR_OR_NULL(di)) { |
4135 | if (!di) | |
4136 | ret = -ENOENT; | |
4137 | else | |
4138 | ret = PTR_ERR(di); | |
4139 | btrfs_abort_transaction(trans, root, ret); | |
4140 | goto out; | |
4141 | } | |
4df27c4d YZ |
4142 | |
4143 | leaf = path->nodes[0]; | |
4144 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); | |
b3b4aa74 | 4145 | btrfs_release_path(path); |
4df27c4d YZ |
4146 | index = key.offset; |
4147 | } | |
945d8962 | 4148 | btrfs_release_path(path); |
4df27c4d | 4149 | |
16cdcec7 | 4150 | ret = btrfs_delete_delayed_dir_index(trans, root, dir, index); |
79787eaa JM |
4151 | if (ret) { |
4152 | btrfs_abort_transaction(trans, root, ret); | |
4153 | goto out; | |
4154 | } | |
4df27c4d YZ |
4155 | |
4156 | btrfs_i_size_write(dir, dir->i_size - name_len * 2); | |
0c4d2d95 | 4157 | inode_inc_iversion(dir); |
4df27c4d | 4158 | dir->i_mtime = dir->i_ctime = CURRENT_TIME; |
5a24e84c | 4159 | ret = btrfs_update_inode_fallback(trans, root, dir); |
79787eaa JM |
4160 | if (ret) |
4161 | btrfs_abort_transaction(trans, root, ret); | |
4162 | out: | |
71d7aed0 | 4163 | btrfs_free_path(path); |
79787eaa | 4164 | return ret; |
4df27c4d YZ |
4165 | } |
4166 | ||
39279cc3 CM |
4167 | static int btrfs_rmdir(struct inode *dir, struct dentry *dentry) |
4168 | { | |
2b0143b5 | 4169 | struct inode *inode = d_inode(dentry); |
1832a6d5 | 4170 | int err = 0; |
39279cc3 | 4171 | struct btrfs_root *root = BTRFS_I(dir)->root; |
39279cc3 | 4172 | struct btrfs_trans_handle *trans; |
39279cc3 | 4173 | |
b3ae244e | 4174 | if (inode->i_size > BTRFS_EMPTY_DIR_SIZE) |
134d4512 | 4175 | return -ENOTEMPTY; |
b3ae244e DS |
4176 | if (btrfs_ino(inode) == BTRFS_FIRST_FREE_OBJECTID) |
4177 | return -EPERM; | |
134d4512 | 4178 | |
d52be818 | 4179 | trans = __unlink_start_trans(dir); |
a22285a6 | 4180 | if (IS_ERR(trans)) |
5df6a9f6 | 4181 | return PTR_ERR(trans); |
5df6a9f6 | 4182 | |
33345d01 | 4183 | if (unlikely(btrfs_ino(inode) == BTRFS_EMPTY_SUBVOL_DIR_OBJECTID)) { |
4df27c4d YZ |
4184 | err = btrfs_unlink_subvol(trans, root, dir, |
4185 | BTRFS_I(inode)->location.objectid, | |
4186 | dentry->d_name.name, | |
4187 | dentry->d_name.len); | |
4188 | goto out; | |
4189 | } | |
4190 | ||
7b128766 JB |
4191 | err = btrfs_orphan_add(trans, inode); |
4192 | if (err) | |
4df27c4d | 4193 | goto out; |
7b128766 | 4194 | |
39279cc3 | 4195 | /* now the directory is empty */ |
2b0143b5 | 4196 | err = btrfs_unlink_inode(trans, root, dir, d_inode(dentry), |
e02119d5 | 4197 | dentry->d_name.name, dentry->d_name.len); |
d397712b | 4198 | if (!err) |
dbe674a9 | 4199 | btrfs_i_size_write(inode, 0); |
4df27c4d | 4200 | out: |
d52be818 | 4201 | btrfs_end_transaction(trans, root); |
b53d3f5d | 4202 | btrfs_btree_balance_dirty(root); |
3954401f | 4203 | |
39279cc3 CM |
4204 | return err; |
4205 | } | |
4206 | ||
28f75a0e CM |
4207 | static int truncate_space_check(struct btrfs_trans_handle *trans, |
4208 | struct btrfs_root *root, | |
4209 | u64 bytes_deleted) | |
4210 | { | |
4211 | int ret; | |
4212 | ||
4213 | bytes_deleted = btrfs_csum_bytes_to_leaves(root, bytes_deleted); | |
4214 | ret = btrfs_block_rsv_add(root, &root->fs_info->trans_block_rsv, | |
4215 | bytes_deleted, BTRFS_RESERVE_NO_FLUSH); | |
4216 | if (!ret) | |
4217 | trans->bytes_reserved += bytes_deleted; | |
4218 | return ret; | |
4219 | ||
4220 | } | |
4221 | ||
0305cd5f FM |
4222 | static int truncate_inline_extent(struct inode *inode, |
4223 | struct btrfs_path *path, | |
4224 | struct btrfs_key *found_key, | |
4225 | const u64 item_end, | |
4226 | const u64 new_size) | |
4227 | { | |
4228 | struct extent_buffer *leaf = path->nodes[0]; | |
4229 | int slot = path->slots[0]; | |
4230 | struct btrfs_file_extent_item *fi; | |
4231 | u32 size = (u32)(new_size - found_key->offset); | |
4232 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
4233 | ||
4234 | fi = btrfs_item_ptr(leaf, slot, struct btrfs_file_extent_item); | |
4235 | ||
4236 | if (btrfs_file_extent_compression(leaf, fi) != BTRFS_COMPRESS_NONE) { | |
4237 | loff_t offset = new_size; | |
4238 | loff_t page_end = ALIGN(offset, PAGE_CACHE_SIZE); | |
4239 | ||
4240 | /* | |
4241 | * Zero out the remaining of the last page of our inline extent, | |
4242 | * instead of directly truncating our inline extent here - that | |
4243 | * would be much more complex (decompressing all the data, then | |
4244 | * compressing the truncated data, which might be bigger than | |
4245 | * the size of the inline extent, resize the extent, etc). | |
4246 | * We release the path because to get the page we might need to | |
4247 | * read the extent item from disk (data not in the page cache). | |
4248 | */ | |
4249 | btrfs_release_path(path); | |
4250 | return btrfs_truncate_page(inode, offset, page_end - offset, 0); | |
4251 | } | |
4252 | ||
4253 | btrfs_set_file_extent_ram_bytes(leaf, fi, size); | |
4254 | size = btrfs_file_extent_calc_inline_size(size); | |
4255 | btrfs_truncate_item(root, path, size, 1); | |
4256 | ||
4257 | if (test_bit(BTRFS_ROOT_REF_COWS, &root->state)) | |
4258 | inode_sub_bytes(inode, item_end + 1 - new_size); | |
4259 | ||
4260 | return 0; | |
4261 | } | |
4262 | ||
39279cc3 CM |
4263 | /* |
4264 | * this can truncate away extent items, csum items and directory items. | |
4265 | * It starts at a high offset and removes keys until it can't find | |
d352ac68 | 4266 | * any higher than new_size |
39279cc3 CM |
4267 | * |
4268 | * csum items that cross the new i_size are truncated to the new size | |
4269 | * as well. | |
7b128766 JB |
4270 | * |
4271 | * min_type is the minimum key type to truncate down to. If set to 0, this | |
4272 | * will kill all the items on this inode, including the INODE_ITEM_KEY. | |
39279cc3 | 4273 | */ |
8082510e YZ |
4274 | int btrfs_truncate_inode_items(struct btrfs_trans_handle *trans, |
4275 | struct btrfs_root *root, | |
4276 | struct inode *inode, | |
4277 | u64 new_size, u32 min_type) | |
39279cc3 | 4278 | { |
39279cc3 | 4279 | struct btrfs_path *path; |
5f39d397 | 4280 | struct extent_buffer *leaf; |
39279cc3 | 4281 | struct btrfs_file_extent_item *fi; |
8082510e YZ |
4282 | struct btrfs_key key; |
4283 | struct btrfs_key found_key; | |
39279cc3 | 4284 | u64 extent_start = 0; |
db94535d | 4285 | u64 extent_num_bytes = 0; |
5d4f98a2 | 4286 | u64 extent_offset = 0; |
39279cc3 | 4287 | u64 item_end = 0; |
c1aa4575 | 4288 | u64 last_size = new_size; |
8082510e | 4289 | u32 found_type = (u8)-1; |
39279cc3 CM |
4290 | int found_extent; |
4291 | int del_item; | |
85e21bac CM |
4292 | int pending_del_nr = 0; |
4293 | int pending_del_slot = 0; | |
179e29e4 | 4294 | int extent_type = -1; |
8082510e YZ |
4295 | int ret; |
4296 | int err = 0; | |
33345d01 | 4297 | u64 ino = btrfs_ino(inode); |
28ed1345 | 4298 | u64 bytes_deleted = 0; |
1262133b JB |
4299 | bool be_nice = 0; |
4300 | bool should_throttle = 0; | |
28f75a0e | 4301 | bool should_end = 0; |
8082510e YZ |
4302 | |
4303 | BUG_ON(new_size > 0 && min_type != BTRFS_EXTENT_DATA_KEY); | |
39279cc3 | 4304 | |
28ed1345 CM |
4305 | /* |
4306 | * for non-free space inodes and ref cows, we want to back off from | |
4307 | * time to time | |
4308 | */ | |
4309 | if (!btrfs_is_free_space_inode(inode) && | |
4310 | test_bit(BTRFS_ROOT_REF_COWS, &root->state)) | |
4311 | be_nice = 1; | |
4312 | ||
0eb0e19c MF |
4313 | path = btrfs_alloc_path(); |
4314 | if (!path) | |
4315 | return -ENOMEM; | |
e4058b54 | 4316 | path->reada = READA_BACK; |
0eb0e19c | 4317 | |
5dc562c5 JB |
4318 | /* |
4319 | * We want to drop from the next block forward in case this new size is | |
4320 | * not block aligned since we will be keeping the last block of the | |
4321 | * extent just the way it is. | |
4322 | */ | |
27cdeb70 MX |
4323 | if (test_bit(BTRFS_ROOT_REF_COWS, &root->state) || |
4324 | root == root->fs_info->tree_root) | |
fda2832f QW |
4325 | btrfs_drop_extent_cache(inode, ALIGN(new_size, |
4326 | root->sectorsize), (u64)-1, 0); | |
8082510e | 4327 | |
16cdcec7 MX |
4328 | /* |
4329 | * This function is also used to drop the items in the log tree before | |
4330 | * we relog the inode, so if root != BTRFS_I(inode)->root, it means | |
4331 | * it is used to drop the loged items. So we shouldn't kill the delayed | |
4332 | * items. | |
4333 | */ | |
4334 | if (min_type == 0 && root == BTRFS_I(inode)->root) | |
4335 | btrfs_kill_delayed_inode_items(inode); | |
4336 | ||
33345d01 | 4337 | key.objectid = ino; |
39279cc3 | 4338 | key.offset = (u64)-1; |
5f39d397 CM |
4339 | key.type = (u8)-1; |
4340 | ||
85e21bac | 4341 | search_again: |
28ed1345 CM |
4342 | /* |
4343 | * with a 16K leaf size and 128MB extents, you can actually queue | |
4344 | * up a huge file in a single leaf. Most of the time that | |
4345 | * bytes_deleted is > 0, it will be huge by the time we get here | |
4346 | */ | |
ee22184b | 4347 | if (be_nice && bytes_deleted > SZ_32M) { |
28ed1345 CM |
4348 | if (btrfs_should_end_transaction(trans, root)) { |
4349 | err = -EAGAIN; | |
4350 | goto error; | |
4351 | } | |
4352 | } | |
4353 | ||
4354 | ||
b9473439 | 4355 | path->leave_spinning = 1; |
85e21bac | 4356 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); |
8082510e YZ |
4357 | if (ret < 0) { |
4358 | err = ret; | |
4359 | goto out; | |
4360 | } | |
d397712b | 4361 | |
85e21bac | 4362 | if (ret > 0) { |
e02119d5 CM |
4363 | /* there are no items in the tree for us to truncate, we're |
4364 | * done | |
4365 | */ | |
8082510e YZ |
4366 | if (path->slots[0] == 0) |
4367 | goto out; | |
85e21bac CM |
4368 | path->slots[0]--; |
4369 | } | |
4370 | ||
d397712b | 4371 | while (1) { |
39279cc3 | 4372 | fi = NULL; |
5f39d397 CM |
4373 | leaf = path->nodes[0]; |
4374 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); | |
962a298f | 4375 | found_type = found_key.type; |
39279cc3 | 4376 | |
33345d01 | 4377 | if (found_key.objectid != ino) |
39279cc3 | 4378 | break; |
5f39d397 | 4379 | |
85e21bac | 4380 | if (found_type < min_type) |
39279cc3 CM |
4381 | break; |
4382 | ||
5f39d397 | 4383 | item_end = found_key.offset; |
39279cc3 | 4384 | if (found_type == BTRFS_EXTENT_DATA_KEY) { |
5f39d397 | 4385 | fi = btrfs_item_ptr(leaf, path->slots[0], |
39279cc3 | 4386 | struct btrfs_file_extent_item); |
179e29e4 CM |
4387 | extent_type = btrfs_file_extent_type(leaf, fi); |
4388 | if (extent_type != BTRFS_FILE_EXTENT_INLINE) { | |
5f39d397 | 4389 | item_end += |
db94535d | 4390 | btrfs_file_extent_num_bytes(leaf, fi); |
179e29e4 | 4391 | } else if (extent_type == BTRFS_FILE_EXTENT_INLINE) { |
179e29e4 | 4392 | item_end += btrfs_file_extent_inline_len(leaf, |
514ac8ad | 4393 | path->slots[0], fi); |
39279cc3 | 4394 | } |
008630c1 | 4395 | item_end--; |
39279cc3 | 4396 | } |
8082510e YZ |
4397 | if (found_type > min_type) { |
4398 | del_item = 1; | |
4399 | } else { | |
4400 | if (item_end < new_size) | |
b888db2b | 4401 | break; |
8082510e YZ |
4402 | if (found_key.offset >= new_size) |
4403 | del_item = 1; | |
4404 | else | |
4405 | del_item = 0; | |
39279cc3 | 4406 | } |
39279cc3 | 4407 | found_extent = 0; |
39279cc3 | 4408 | /* FIXME, shrink the extent if the ref count is only 1 */ |
179e29e4 CM |
4409 | if (found_type != BTRFS_EXTENT_DATA_KEY) |
4410 | goto delete; | |
4411 | ||
7f4f6e0a JB |
4412 | if (del_item) |
4413 | last_size = found_key.offset; | |
4414 | else | |
4415 | last_size = new_size; | |
4416 | ||
179e29e4 | 4417 | if (extent_type != BTRFS_FILE_EXTENT_INLINE) { |
39279cc3 | 4418 | u64 num_dec; |
db94535d | 4419 | extent_start = btrfs_file_extent_disk_bytenr(leaf, fi); |
f70a9a6b | 4420 | if (!del_item) { |
db94535d CM |
4421 | u64 orig_num_bytes = |
4422 | btrfs_file_extent_num_bytes(leaf, fi); | |
fda2832f QW |
4423 | extent_num_bytes = ALIGN(new_size - |
4424 | found_key.offset, | |
4425 | root->sectorsize); | |
db94535d CM |
4426 | btrfs_set_file_extent_num_bytes(leaf, fi, |
4427 | extent_num_bytes); | |
4428 | num_dec = (orig_num_bytes - | |
9069218d | 4429 | extent_num_bytes); |
27cdeb70 MX |
4430 | if (test_bit(BTRFS_ROOT_REF_COWS, |
4431 | &root->state) && | |
4432 | extent_start != 0) | |
a76a3cd4 | 4433 | inode_sub_bytes(inode, num_dec); |
5f39d397 | 4434 | btrfs_mark_buffer_dirty(leaf); |
39279cc3 | 4435 | } else { |
db94535d CM |
4436 | extent_num_bytes = |
4437 | btrfs_file_extent_disk_num_bytes(leaf, | |
4438 | fi); | |
5d4f98a2 YZ |
4439 | extent_offset = found_key.offset - |
4440 | btrfs_file_extent_offset(leaf, fi); | |
4441 | ||
39279cc3 | 4442 | /* FIXME blocksize != 4096 */ |
9069218d | 4443 | num_dec = btrfs_file_extent_num_bytes(leaf, fi); |
39279cc3 CM |
4444 | if (extent_start != 0) { |
4445 | found_extent = 1; | |
27cdeb70 MX |
4446 | if (test_bit(BTRFS_ROOT_REF_COWS, |
4447 | &root->state)) | |
a76a3cd4 | 4448 | inode_sub_bytes(inode, num_dec); |
e02119d5 | 4449 | } |
39279cc3 | 4450 | } |
9069218d | 4451 | } else if (extent_type == BTRFS_FILE_EXTENT_INLINE) { |
c8b97818 CM |
4452 | /* |
4453 | * we can't truncate inline items that have had | |
4454 | * special encodings | |
4455 | */ | |
4456 | if (!del_item && | |
c8b97818 CM |
4457 | btrfs_file_extent_encryption(leaf, fi) == 0 && |
4458 | btrfs_file_extent_other_encoding(leaf, fi) == 0) { | |
514ac8ad CM |
4459 | |
4460 | /* | |
0305cd5f FM |
4461 | * Need to release path in order to truncate a |
4462 | * compressed extent. So delete any accumulated | |
4463 | * extent items so far. | |
514ac8ad | 4464 | */ |
0305cd5f FM |
4465 | if (btrfs_file_extent_compression(leaf, fi) != |
4466 | BTRFS_COMPRESS_NONE && pending_del_nr) { | |
4467 | err = btrfs_del_items(trans, root, path, | |
4468 | pending_del_slot, | |
4469 | pending_del_nr); | |
4470 | if (err) { | |
4471 | btrfs_abort_transaction(trans, | |
4472 | root, | |
4473 | err); | |
4474 | goto error; | |
4475 | } | |
4476 | pending_del_nr = 0; | |
4477 | } | |
4478 | ||
4479 | err = truncate_inline_extent(inode, path, | |
4480 | &found_key, | |
4481 | item_end, | |
4482 | new_size); | |
4483 | if (err) { | |
4484 | btrfs_abort_transaction(trans, | |
4485 | root, err); | |
4486 | goto error; | |
4487 | } | |
27cdeb70 MX |
4488 | } else if (test_bit(BTRFS_ROOT_REF_COWS, |
4489 | &root->state)) { | |
0305cd5f | 4490 | inode_sub_bytes(inode, item_end + 1 - new_size); |
9069218d | 4491 | } |
39279cc3 | 4492 | } |
179e29e4 | 4493 | delete: |
39279cc3 | 4494 | if (del_item) { |
85e21bac CM |
4495 | if (!pending_del_nr) { |
4496 | /* no pending yet, add ourselves */ | |
4497 | pending_del_slot = path->slots[0]; | |
4498 | pending_del_nr = 1; | |
4499 | } else if (pending_del_nr && | |
4500 | path->slots[0] + 1 == pending_del_slot) { | |
4501 | /* hop on the pending chunk */ | |
4502 | pending_del_nr++; | |
4503 | pending_del_slot = path->slots[0]; | |
4504 | } else { | |
d397712b | 4505 | BUG(); |
85e21bac | 4506 | } |
39279cc3 CM |
4507 | } else { |
4508 | break; | |
4509 | } | |
28f75a0e CM |
4510 | should_throttle = 0; |
4511 | ||
27cdeb70 MX |
4512 | if (found_extent && |
4513 | (test_bit(BTRFS_ROOT_REF_COWS, &root->state) || | |
4514 | root == root->fs_info->tree_root)) { | |
b9473439 | 4515 | btrfs_set_path_blocking(path); |
28ed1345 | 4516 | bytes_deleted += extent_num_bytes; |
39279cc3 | 4517 | ret = btrfs_free_extent(trans, root, extent_start, |
5d4f98a2 YZ |
4518 | extent_num_bytes, 0, |
4519 | btrfs_header_owner(leaf), | |
b06c4bf5 | 4520 | ino, extent_offset); |
39279cc3 | 4521 | BUG_ON(ret); |
1262133b | 4522 | if (btrfs_should_throttle_delayed_refs(trans, root)) |
28ed1345 CM |
4523 | btrfs_async_run_delayed_refs(root, |
4524 | trans->delayed_ref_updates * 2, 0); | |
28f75a0e CM |
4525 | if (be_nice) { |
4526 | if (truncate_space_check(trans, root, | |
4527 | extent_num_bytes)) { | |
4528 | should_end = 1; | |
4529 | } | |
4530 | if (btrfs_should_throttle_delayed_refs(trans, | |
4531 | root)) { | |
4532 | should_throttle = 1; | |
4533 | } | |
4534 | } | |
39279cc3 | 4535 | } |
85e21bac | 4536 | |
8082510e YZ |
4537 | if (found_type == BTRFS_INODE_ITEM_KEY) |
4538 | break; | |
4539 | ||
4540 | if (path->slots[0] == 0 || | |
1262133b | 4541 | path->slots[0] != pending_del_slot || |
28f75a0e | 4542 | should_throttle || should_end) { |
8082510e YZ |
4543 | if (pending_del_nr) { |
4544 | ret = btrfs_del_items(trans, root, path, | |
4545 | pending_del_slot, | |
4546 | pending_del_nr); | |
79787eaa JM |
4547 | if (ret) { |
4548 | btrfs_abort_transaction(trans, | |
4549 | root, ret); | |
4550 | goto error; | |
4551 | } | |
8082510e YZ |
4552 | pending_del_nr = 0; |
4553 | } | |
b3b4aa74 | 4554 | btrfs_release_path(path); |
28f75a0e | 4555 | if (should_throttle) { |
1262133b JB |
4556 | unsigned long updates = trans->delayed_ref_updates; |
4557 | if (updates) { | |
4558 | trans->delayed_ref_updates = 0; | |
4559 | ret = btrfs_run_delayed_refs(trans, root, updates * 2); | |
4560 | if (ret && !err) | |
4561 | err = ret; | |
4562 | } | |
4563 | } | |
28f75a0e CM |
4564 | /* |
4565 | * if we failed to refill our space rsv, bail out | |
4566 | * and let the transaction restart | |
4567 | */ | |
4568 | if (should_end) { | |
4569 | err = -EAGAIN; | |
4570 | goto error; | |
4571 | } | |
85e21bac | 4572 | goto search_again; |
8082510e YZ |
4573 | } else { |
4574 | path->slots[0]--; | |
85e21bac | 4575 | } |
39279cc3 | 4576 | } |
8082510e | 4577 | out: |
85e21bac CM |
4578 | if (pending_del_nr) { |
4579 | ret = btrfs_del_items(trans, root, path, pending_del_slot, | |
4580 | pending_del_nr); | |
79787eaa JM |
4581 | if (ret) |
4582 | btrfs_abort_transaction(trans, root, ret); | |
85e21bac | 4583 | } |
79787eaa | 4584 | error: |
c1aa4575 | 4585 | if (root->root_key.objectid != BTRFS_TREE_LOG_OBJECTID) |
7f4f6e0a | 4586 | btrfs_ordered_update_i_size(inode, last_size, NULL); |
28ed1345 | 4587 | |
39279cc3 | 4588 | btrfs_free_path(path); |
28ed1345 | 4589 | |
ee22184b | 4590 | if (be_nice && bytes_deleted > SZ_32M) { |
28ed1345 CM |
4591 | unsigned long updates = trans->delayed_ref_updates; |
4592 | if (updates) { | |
4593 | trans->delayed_ref_updates = 0; | |
4594 | ret = btrfs_run_delayed_refs(trans, root, updates * 2); | |
4595 | if (ret && !err) | |
4596 | err = ret; | |
4597 | } | |
4598 | } | |
8082510e | 4599 | return err; |
39279cc3 CM |
4600 | } |
4601 | ||
4602 | /* | |
2aaa6655 JB |
4603 | * btrfs_truncate_page - read, zero a chunk and write a page |
4604 | * @inode - inode that we're zeroing | |
4605 | * @from - the offset to start zeroing | |
4606 | * @len - the length to zero, 0 to zero the entire range respective to the | |
4607 | * offset | |
4608 | * @front - zero up to the offset instead of from the offset on | |
4609 | * | |
4610 | * This will find the page for the "from" offset and cow the page and zero the | |
4611 | * part we want to zero. This is used with truncate and hole punching. | |
39279cc3 | 4612 | */ |
2aaa6655 JB |
4613 | int btrfs_truncate_page(struct inode *inode, loff_t from, loff_t len, |
4614 | int front) | |
39279cc3 | 4615 | { |
2aaa6655 | 4616 | struct address_space *mapping = inode->i_mapping; |
db94535d | 4617 | struct btrfs_root *root = BTRFS_I(inode)->root; |
e6dcd2dc CM |
4618 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; |
4619 | struct btrfs_ordered_extent *ordered; | |
2ac55d41 | 4620 | struct extent_state *cached_state = NULL; |
e6dcd2dc | 4621 | char *kaddr; |
db94535d | 4622 | u32 blocksize = root->sectorsize; |
39279cc3 CM |
4623 | pgoff_t index = from >> PAGE_CACHE_SHIFT; |
4624 | unsigned offset = from & (PAGE_CACHE_SIZE-1); | |
4625 | struct page *page; | |
3b16a4e3 | 4626 | gfp_t mask = btrfs_alloc_write_mask(mapping); |
39279cc3 | 4627 | int ret = 0; |
a52d9a80 | 4628 | u64 page_start; |
e6dcd2dc | 4629 | u64 page_end; |
39279cc3 | 4630 | |
2aaa6655 JB |
4631 | if ((offset & (blocksize - 1)) == 0 && |
4632 | (!len || ((len & (blocksize - 1)) == 0))) | |
39279cc3 | 4633 | goto out; |
7cf5b976 | 4634 | ret = btrfs_delalloc_reserve_space(inode, |
df480633 | 4635 | round_down(from, PAGE_CACHE_SIZE), PAGE_CACHE_SIZE); |
5d5e103a JB |
4636 | if (ret) |
4637 | goto out; | |
39279cc3 | 4638 | |
211c17f5 | 4639 | again: |
3b16a4e3 | 4640 | page = find_or_create_page(mapping, index, mask); |
5d5e103a | 4641 | if (!page) { |
7cf5b976 | 4642 | btrfs_delalloc_release_space(inode, |
df480633 QW |
4643 | round_down(from, PAGE_CACHE_SIZE), |
4644 | PAGE_CACHE_SIZE); | |
ac6a2b36 | 4645 | ret = -ENOMEM; |
39279cc3 | 4646 | goto out; |
5d5e103a | 4647 | } |
e6dcd2dc CM |
4648 | |
4649 | page_start = page_offset(page); | |
4650 | page_end = page_start + PAGE_CACHE_SIZE - 1; | |
4651 | ||
39279cc3 | 4652 | if (!PageUptodate(page)) { |
9ebefb18 | 4653 | ret = btrfs_readpage(NULL, page); |
39279cc3 | 4654 | lock_page(page); |
211c17f5 CM |
4655 | if (page->mapping != mapping) { |
4656 | unlock_page(page); | |
4657 | page_cache_release(page); | |
4658 | goto again; | |
4659 | } | |
39279cc3 CM |
4660 | if (!PageUptodate(page)) { |
4661 | ret = -EIO; | |
89642229 | 4662 | goto out_unlock; |
39279cc3 CM |
4663 | } |
4664 | } | |
211c17f5 | 4665 | wait_on_page_writeback(page); |
e6dcd2dc | 4666 | |
ff13db41 | 4667 | lock_extent_bits(io_tree, page_start, page_end, &cached_state); |
e6dcd2dc CM |
4668 | set_page_extent_mapped(page); |
4669 | ||
4670 | ordered = btrfs_lookup_ordered_extent(inode, page_start); | |
4671 | if (ordered) { | |
2ac55d41 JB |
4672 | unlock_extent_cached(io_tree, page_start, page_end, |
4673 | &cached_state, GFP_NOFS); | |
e6dcd2dc CM |
4674 | unlock_page(page); |
4675 | page_cache_release(page); | |
eb84ae03 | 4676 | btrfs_start_ordered_extent(inode, ordered, 1); |
e6dcd2dc CM |
4677 | btrfs_put_ordered_extent(ordered); |
4678 | goto again; | |
4679 | } | |
4680 | ||
2ac55d41 | 4681 | clear_extent_bit(&BTRFS_I(inode)->io_tree, page_start, page_end, |
9e8a4a8b LB |
4682 | EXTENT_DIRTY | EXTENT_DELALLOC | |
4683 | EXTENT_DO_ACCOUNTING | EXTENT_DEFRAG, | |
2ac55d41 | 4684 | 0, 0, &cached_state, GFP_NOFS); |
5d5e103a | 4685 | |
2ac55d41 JB |
4686 | ret = btrfs_set_extent_delalloc(inode, page_start, page_end, |
4687 | &cached_state); | |
9ed74f2d | 4688 | if (ret) { |
2ac55d41 JB |
4689 | unlock_extent_cached(io_tree, page_start, page_end, |
4690 | &cached_state, GFP_NOFS); | |
9ed74f2d JB |
4691 | goto out_unlock; |
4692 | } | |
4693 | ||
e6dcd2dc | 4694 | if (offset != PAGE_CACHE_SIZE) { |
2aaa6655 JB |
4695 | if (!len) |
4696 | len = PAGE_CACHE_SIZE - offset; | |
e6dcd2dc | 4697 | kaddr = kmap(page); |
2aaa6655 JB |
4698 | if (front) |
4699 | memset(kaddr, 0, offset); | |
4700 | else | |
4701 | memset(kaddr + offset, 0, len); | |
e6dcd2dc CM |
4702 | flush_dcache_page(page); |
4703 | kunmap(page); | |
4704 | } | |
247e743c | 4705 | ClearPageChecked(page); |
e6dcd2dc | 4706 | set_page_dirty(page); |
2ac55d41 JB |
4707 | unlock_extent_cached(io_tree, page_start, page_end, &cached_state, |
4708 | GFP_NOFS); | |
39279cc3 | 4709 | |
89642229 | 4710 | out_unlock: |
5d5e103a | 4711 | if (ret) |
7cf5b976 QW |
4712 | btrfs_delalloc_release_space(inode, page_start, |
4713 | PAGE_CACHE_SIZE); | |
39279cc3 CM |
4714 | unlock_page(page); |
4715 | page_cache_release(page); | |
4716 | out: | |
4717 | return ret; | |
4718 | } | |
4719 | ||
16e7549f JB |
4720 | static int maybe_insert_hole(struct btrfs_root *root, struct inode *inode, |
4721 | u64 offset, u64 len) | |
4722 | { | |
4723 | struct btrfs_trans_handle *trans; | |
4724 | int ret; | |
4725 | ||
4726 | /* | |
4727 | * Still need to make sure the inode looks like it's been updated so | |
4728 | * that any holes get logged if we fsync. | |
4729 | */ | |
4730 | if (btrfs_fs_incompat(root->fs_info, NO_HOLES)) { | |
4731 | BTRFS_I(inode)->last_trans = root->fs_info->generation; | |
4732 | BTRFS_I(inode)->last_sub_trans = root->log_transid; | |
4733 | BTRFS_I(inode)->last_log_commit = root->last_log_commit; | |
4734 | return 0; | |
4735 | } | |
4736 | ||
4737 | /* | |
4738 | * 1 - for the one we're dropping | |
4739 | * 1 - for the one we're adding | |
4740 | * 1 - for updating the inode. | |
4741 | */ | |
4742 | trans = btrfs_start_transaction(root, 3); | |
4743 | if (IS_ERR(trans)) | |
4744 | return PTR_ERR(trans); | |
4745 | ||
4746 | ret = btrfs_drop_extents(trans, root, inode, offset, offset + len, 1); | |
4747 | if (ret) { | |
4748 | btrfs_abort_transaction(trans, root, ret); | |
4749 | btrfs_end_transaction(trans, root); | |
4750 | return ret; | |
4751 | } | |
4752 | ||
4753 | ret = btrfs_insert_file_extent(trans, root, btrfs_ino(inode), offset, | |
4754 | 0, 0, len, 0, len, 0, 0, 0); | |
4755 | if (ret) | |
4756 | btrfs_abort_transaction(trans, root, ret); | |
4757 | else | |
4758 | btrfs_update_inode(trans, root, inode); | |
4759 | btrfs_end_transaction(trans, root); | |
4760 | return ret; | |
4761 | } | |
4762 | ||
695a0d0d JB |
4763 | /* |
4764 | * This function puts in dummy file extents for the area we're creating a hole | |
4765 | * for. So if we are truncating this file to a larger size we need to insert | |
4766 | * these file extents so that btrfs_get_extent will return a EXTENT_MAP_HOLE for | |
4767 | * the range between oldsize and size | |
4768 | */ | |
a41ad394 | 4769 | int btrfs_cont_expand(struct inode *inode, loff_t oldsize, loff_t size) |
39279cc3 | 4770 | { |
9036c102 YZ |
4771 | struct btrfs_root *root = BTRFS_I(inode)->root; |
4772 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; | |
a22285a6 | 4773 | struct extent_map *em = NULL; |
2ac55d41 | 4774 | struct extent_state *cached_state = NULL; |
5dc562c5 | 4775 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; |
fda2832f QW |
4776 | u64 hole_start = ALIGN(oldsize, root->sectorsize); |
4777 | u64 block_end = ALIGN(size, root->sectorsize); | |
9036c102 YZ |
4778 | u64 last_byte; |
4779 | u64 cur_offset; | |
4780 | u64 hole_size; | |
9ed74f2d | 4781 | int err = 0; |
39279cc3 | 4782 | |
a71754fc JB |
4783 | /* |
4784 | * If our size started in the middle of a page we need to zero out the | |
4785 | * rest of the page before we expand the i_size, otherwise we could | |
4786 | * expose stale data. | |
4787 | */ | |
4788 | err = btrfs_truncate_page(inode, oldsize, 0, 0); | |
4789 | if (err) | |
4790 | return err; | |
4791 | ||
9036c102 YZ |
4792 | if (size <= hole_start) |
4793 | return 0; | |
4794 | ||
9036c102 YZ |
4795 | while (1) { |
4796 | struct btrfs_ordered_extent *ordered; | |
fa7c1494 | 4797 | |
ff13db41 | 4798 | lock_extent_bits(io_tree, hole_start, block_end - 1, |
d0082371 | 4799 | &cached_state); |
fa7c1494 MX |
4800 | ordered = btrfs_lookup_ordered_range(inode, hole_start, |
4801 | block_end - hole_start); | |
9036c102 YZ |
4802 | if (!ordered) |
4803 | break; | |
2ac55d41 JB |
4804 | unlock_extent_cached(io_tree, hole_start, block_end - 1, |
4805 | &cached_state, GFP_NOFS); | |
fa7c1494 | 4806 | btrfs_start_ordered_extent(inode, ordered, 1); |
9036c102 YZ |
4807 | btrfs_put_ordered_extent(ordered); |
4808 | } | |
39279cc3 | 4809 | |
9036c102 YZ |
4810 | cur_offset = hole_start; |
4811 | while (1) { | |
4812 | em = btrfs_get_extent(inode, NULL, 0, cur_offset, | |
4813 | block_end - cur_offset, 0); | |
79787eaa JM |
4814 | if (IS_ERR(em)) { |
4815 | err = PTR_ERR(em); | |
f2767956 | 4816 | em = NULL; |
79787eaa JM |
4817 | break; |
4818 | } | |
9036c102 | 4819 | last_byte = min(extent_map_end(em), block_end); |
fda2832f | 4820 | last_byte = ALIGN(last_byte , root->sectorsize); |
8082510e | 4821 | if (!test_bit(EXTENT_FLAG_PREALLOC, &em->flags)) { |
5dc562c5 | 4822 | struct extent_map *hole_em; |
9036c102 | 4823 | hole_size = last_byte - cur_offset; |
9ed74f2d | 4824 | |
16e7549f JB |
4825 | err = maybe_insert_hole(root, inode, cur_offset, |
4826 | hole_size); | |
4827 | if (err) | |
3893e33b | 4828 | break; |
5dc562c5 JB |
4829 | btrfs_drop_extent_cache(inode, cur_offset, |
4830 | cur_offset + hole_size - 1, 0); | |
4831 | hole_em = alloc_extent_map(); | |
4832 | if (!hole_em) { | |
4833 | set_bit(BTRFS_INODE_NEEDS_FULL_SYNC, | |
4834 | &BTRFS_I(inode)->runtime_flags); | |
4835 | goto next; | |
4836 | } | |
4837 | hole_em->start = cur_offset; | |
4838 | hole_em->len = hole_size; | |
4839 | hole_em->orig_start = cur_offset; | |
8082510e | 4840 | |
5dc562c5 JB |
4841 | hole_em->block_start = EXTENT_MAP_HOLE; |
4842 | hole_em->block_len = 0; | |
b4939680 | 4843 | hole_em->orig_block_len = 0; |
cc95bef6 | 4844 | hole_em->ram_bytes = hole_size; |
5dc562c5 JB |
4845 | hole_em->bdev = root->fs_info->fs_devices->latest_bdev; |
4846 | hole_em->compress_type = BTRFS_COMPRESS_NONE; | |
16e7549f | 4847 | hole_em->generation = root->fs_info->generation; |
8082510e | 4848 | |
5dc562c5 JB |
4849 | while (1) { |
4850 | write_lock(&em_tree->lock); | |
09a2a8f9 | 4851 | err = add_extent_mapping(em_tree, hole_em, 1); |
5dc562c5 JB |
4852 | write_unlock(&em_tree->lock); |
4853 | if (err != -EEXIST) | |
4854 | break; | |
4855 | btrfs_drop_extent_cache(inode, cur_offset, | |
4856 | cur_offset + | |
4857 | hole_size - 1, 0); | |
4858 | } | |
4859 | free_extent_map(hole_em); | |
9036c102 | 4860 | } |
16e7549f | 4861 | next: |
9036c102 | 4862 | free_extent_map(em); |
a22285a6 | 4863 | em = NULL; |
9036c102 | 4864 | cur_offset = last_byte; |
8082510e | 4865 | if (cur_offset >= block_end) |
9036c102 YZ |
4866 | break; |
4867 | } | |
a22285a6 | 4868 | free_extent_map(em); |
2ac55d41 JB |
4869 | unlock_extent_cached(io_tree, hole_start, block_end - 1, &cached_state, |
4870 | GFP_NOFS); | |
9036c102 YZ |
4871 | return err; |
4872 | } | |
39279cc3 | 4873 | |
3972f260 | 4874 | static int btrfs_setsize(struct inode *inode, struct iattr *attr) |
8082510e | 4875 | { |
f4a2f4c5 MX |
4876 | struct btrfs_root *root = BTRFS_I(inode)->root; |
4877 | struct btrfs_trans_handle *trans; | |
a41ad394 | 4878 | loff_t oldsize = i_size_read(inode); |
3972f260 ES |
4879 | loff_t newsize = attr->ia_size; |
4880 | int mask = attr->ia_valid; | |
8082510e YZ |
4881 | int ret; |
4882 | ||
3972f260 ES |
4883 | /* |
4884 | * The regular truncate() case without ATTR_CTIME and ATTR_MTIME is a | |
4885 | * special case where we need to update the times despite not having | |
4886 | * these flags set. For all other operations the VFS set these flags | |
4887 | * explicitly if it wants a timestamp update. | |
4888 | */ | |
dff6efc3 CH |
4889 | if (newsize != oldsize) { |
4890 | inode_inc_iversion(inode); | |
4891 | if (!(mask & (ATTR_CTIME | ATTR_MTIME))) | |
4892 | inode->i_ctime = inode->i_mtime = | |
4893 | current_fs_time(inode->i_sb); | |
4894 | } | |
3972f260 | 4895 | |
a41ad394 | 4896 | if (newsize > oldsize) { |
7caef267 | 4897 | truncate_pagecache(inode, newsize); |
9ea24bbe FM |
4898 | /* |
4899 | * Don't do an expanding truncate while snapshoting is ongoing. | |
4900 | * This is to ensure the snapshot captures a fully consistent | |
4901 | * state of this file - if the snapshot captures this expanding | |
4902 | * truncation, it must capture all writes that happened before | |
4903 | * this truncation. | |
4904 | */ | |
0bc19f90 | 4905 | btrfs_wait_for_snapshot_creation(root); |
a41ad394 | 4906 | ret = btrfs_cont_expand(inode, oldsize, newsize); |
9ea24bbe FM |
4907 | if (ret) { |
4908 | btrfs_end_write_no_snapshoting(root); | |
8082510e | 4909 | return ret; |
9ea24bbe | 4910 | } |
8082510e | 4911 | |
f4a2f4c5 | 4912 | trans = btrfs_start_transaction(root, 1); |
9ea24bbe FM |
4913 | if (IS_ERR(trans)) { |
4914 | btrfs_end_write_no_snapshoting(root); | |
f4a2f4c5 | 4915 | return PTR_ERR(trans); |
9ea24bbe | 4916 | } |
f4a2f4c5 MX |
4917 | |
4918 | i_size_write(inode, newsize); | |
4919 | btrfs_ordered_update_i_size(inode, i_size_read(inode), NULL); | |
4920 | ret = btrfs_update_inode(trans, root, inode); | |
9ea24bbe | 4921 | btrfs_end_write_no_snapshoting(root); |
7ad85bb7 | 4922 | btrfs_end_transaction(trans, root); |
a41ad394 | 4923 | } else { |
8082510e | 4924 | |
a41ad394 JB |
4925 | /* |
4926 | * We're truncating a file that used to have good data down to | |
4927 | * zero. Make sure it gets into the ordered flush list so that | |
4928 | * any new writes get down to disk quickly. | |
4929 | */ | |
4930 | if (newsize == 0) | |
72ac3c0d JB |
4931 | set_bit(BTRFS_INODE_ORDERED_DATA_CLOSE, |
4932 | &BTRFS_I(inode)->runtime_flags); | |
8082510e | 4933 | |
f3fe820c JB |
4934 | /* |
4935 | * 1 for the orphan item we're going to add | |
4936 | * 1 for the orphan item deletion. | |
4937 | */ | |
4938 | trans = btrfs_start_transaction(root, 2); | |
4939 | if (IS_ERR(trans)) | |
4940 | return PTR_ERR(trans); | |
4941 | ||
4942 | /* | |
4943 | * We need to do this in case we fail at _any_ point during the | |
4944 | * actual truncate. Once we do the truncate_setsize we could | |
4945 | * invalidate pages which forces any outstanding ordered io to | |
4946 | * be instantly completed which will give us extents that need | |
4947 | * to be truncated. If we fail to get an orphan inode down we | |
4948 | * could have left over extents that were never meant to live, | |
4949 | * so we need to garuntee from this point on that everything | |
4950 | * will be consistent. | |
4951 | */ | |
4952 | ret = btrfs_orphan_add(trans, inode); | |
4953 | btrfs_end_transaction(trans, root); | |
4954 | if (ret) | |
4955 | return ret; | |
4956 | ||
a41ad394 JB |
4957 | /* we don't support swapfiles, so vmtruncate shouldn't fail */ |
4958 | truncate_setsize(inode, newsize); | |
2e60a51e MX |
4959 | |
4960 | /* Disable nonlocked read DIO to avoid the end less truncate */ | |
4961 | btrfs_inode_block_unlocked_dio(inode); | |
4962 | inode_dio_wait(inode); | |
4963 | btrfs_inode_resume_unlocked_dio(inode); | |
4964 | ||
a41ad394 | 4965 | ret = btrfs_truncate(inode); |
7f4f6e0a JB |
4966 | if (ret && inode->i_nlink) { |
4967 | int err; | |
4968 | ||
4969 | /* | |
4970 | * failed to truncate, disk_i_size is only adjusted down | |
4971 | * as we remove extents, so it should represent the true | |
4972 | * size of the inode, so reset the in memory size and | |
4973 | * delete our orphan entry. | |
4974 | */ | |
4975 | trans = btrfs_join_transaction(root); | |
4976 | if (IS_ERR(trans)) { | |
4977 | btrfs_orphan_del(NULL, inode); | |
4978 | return ret; | |
4979 | } | |
4980 | i_size_write(inode, BTRFS_I(inode)->disk_i_size); | |
4981 | err = btrfs_orphan_del(trans, inode); | |
4982 | if (err) | |
4983 | btrfs_abort_transaction(trans, root, err); | |
4984 | btrfs_end_transaction(trans, root); | |
4985 | } | |
8082510e YZ |
4986 | } |
4987 | ||
a41ad394 | 4988 | return ret; |
8082510e YZ |
4989 | } |
4990 | ||
9036c102 YZ |
4991 | static int btrfs_setattr(struct dentry *dentry, struct iattr *attr) |
4992 | { | |
2b0143b5 | 4993 | struct inode *inode = d_inode(dentry); |
b83cc969 | 4994 | struct btrfs_root *root = BTRFS_I(inode)->root; |
9036c102 | 4995 | int err; |
39279cc3 | 4996 | |
b83cc969 LZ |
4997 | if (btrfs_root_readonly(root)) |
4998 | return -EROFS; | |
4999 | ||
9036c102 YZ |
5000 | err = inode_change_ok(inode, attr); |
5001 | if (err) | |
5002 | return err; | |
2bf5a725 | 5003 | |
5a3f23d5 | 5004 | if (S_ISREG(inode->i_mode) && (attr->ia_valid & ATTR_SIZE)) { |
3972f260 | 5005 | err = btrfs_setsize(inode, attr); |
8082510e YZ |
5006 | if (err) |
5007 | return err; | |
39279cc3 | 5008 | } |
9036c102 | 5009 | |
1025774c CH |
5010 | if (attr->ia_valid) { |
5011 | setattr_copy(inode, attr); | |
0c4d2d95 | 5012 | inode_inc_iversion(inode); |
22c44fe6 | 5013 | err = btrfs_dirty_inode(inode); |
1025774c | 5014 | |
22c44fe6 | 5015 | if (!err && attr->ia_valid & ATTR_MODE) |
996a710d | 5016 | err = posix_acl_chmod(inode, inode->i_mode); |
1025774c | 5017 | } |
33268eaf | 5018 | |
39279cc3 CM |
5019 | return err; |
5020 | } | |
61295eb8 | 5021 | |
131e404a FDBM |
5022 | /* |
5023 | * While truncating the inode pages during eviction, we get the VFS calling | |
5024 | * btrfs_invalidatepage() against each page of the inode. This is slow because | |
5025 | * the calls to btrfs_invalidatepage() result in a huge amount of calls to | |
5026 | * lock_extent_bits() and clear_extent_bit(), which keep merging and splitting | |
5027 | * extent_state structures over and over, wasting lots of time. | |
5028 | * | |
5029 | * Therefore if the inode is being evicted, let btrfs_invalidatepage() skip all | |
5030 | * those expensive operations on a per page basis and do only the ordered io | |
5031 | * finishing, while we release here the extent_map and extent_state structures, | |
5032 | * without the excessive merging and splitting. | |
5033 | */ | |
5034 | static void evict_inode_truncate_pages(struct inode *inode) | |
5035 | { | |
5036 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; | |
5037 | struct extent_map_tree *map_tree = &BTRFS_I(inode)->extent_tree; | |
5038 | struct rb_node *node; | |
5039 | ||
5040 | ASSERT(inode->i_state & I_FREEING); | |
91b0abe3 | 5041 | truncate_inode_pages_final(&inode->i_data); |
131e404a FDBM |
5042 | |
5043 | write_lock(&map_tree->lock); | |
5044 | while (!RB_EMPTY_ROOT(&map_tree->map)) { | |
5045 | struct extent_map *em; | |
5046 | ||
5047 | node = rb_first(&map_tree->map); | |
5048 | em = rb_entry(node, struct extent_map, rb_node); | |
180589ef WS |
5049 | clear_bit(EXTENT_FLAG_PINNED, &em->flags); |
5050 | clear_bit(EXTENT_FLAG_LOGGING, &em->flags); | |
131e404a FDBM |
5051 | remove_extent_mapping(map_tree, em); |
5052 | free_extent_map(em); | |
7064dd5c FM |
5053 | if (need_resched()) { |
5054 | write_unlock(&map_tree->lock); | |
5055 | cond_resched(); | |
5056 | write_lock(&map_tree->lock); | |
5057 | } | |
131e404a FDBM |
5058 | } |
5059 | write_unlock(&map_tree->lock); | |
5060 | ||
6ca07097 FM |
5061 | /* |
5062 | * Keep looping until we have no more ranges in the io tree. | |
5063 | * We can have ongoing bios started by readpages (called from readahead) | |
9c6429d9 FM |
5064 | * that have their endio callback (extent_io.c:end_bio_extent_readpage) |
5065 | * still in progress (unlocked the pages in the bio but did not yet | |
5066 | * unlocked the ranges in the io tree). Therefore this means some | |
6ca07097 FM |
5067 | * ranges can still be locked and eviction started because before |
5068 | * submitting those bios, which are executed by a separate task (work | |
5069 | * queue kthread), inode references (inode->i_count) were not taken | |
5070 | * (which would be dropped in the end io callback of each bio). | |
5071 | * Therefore here we effectively end up waiting for those bios and | |
5072 | * anyone else holding locked ranges without having bumped the inode's | |
5073 | * reference count - if we don't do it, when they access the inode's | |
5074 | * io_tree to unlock a range it may be too late, leading to an | |
5075 | * use-after-free issue. | |
5076 | */ | |
131e404a FDBM |
5077 | spin_lock(&io_tree->lock); |
5078 | while (!RB_EMPTY_ROOT(&io_tree->state)) { | |
5079 | struct extent_state *state; | |
5080 | struct extent_state *cached_state = NULL; | |
6ca07097 FM |
5081 | u64 start; |
5082 | u64 end; | |
131e404a FDBM |
5083 | |
5084 | node = rb_first(&io_tree->state); | |
5085 | state = rb_entry(node, struct extent_state, rb_node); | |
6ca07097 FM |
5086 | start = state->start; |
5087 | end = state->end; | |
131e404a FDBM |
5088 | spin_unlock(&io_tree->lock); |
5089 | ||
ff13db41 | 5090 | lock_extent_bits(io_tree, start, end, &cached_state); |
b9d0b389 QW |
5091 | |
5092 | /* | |
5093 | * If still has DELALLOC flag, the extent didn't reach disk, | |
5094 | * and its reserved space won't be freed by delayed_ref. | |
5095 | * So we need to free its reserved space here. | |
5096 | * (Refer to comment in btrfs_invalidatepage, case 2) | |
5097 | * | |
5098 | * Note, end is the bytenr of last byte, so we need + 1 here. | |
5099 | */ | |
5100 | if (state->state & EXTENT_DELALLOC) | |
5101 | btrfs_qgroup_free_data(inode, start, end - start + 1); | |
5102 | ||
6ca07097 | 5103 | clear_extent_bit(io_tree, start, end, |
131e404a FDBM |
5104 | EXTENT_LOCKED | EXTENT_DIRTY | |
5105 | EXTENT_DELALLOC | EXTENT_DO_ACCOUNTING | | |
5106 | EXTENT_DEFRAG, 1, 1, | |
5107 | &cached_state, GFP_NOFS); | |
131e404a | 5108 | |
7064dd5c | 5109 | cond_resched(); |
131e404a FDBM |
5110 | spin_lock(&io_tree->lock); |
5111 | } | |
5112 | spin_unlock(&io_tree->lock); | |
5113 | } | |
5114 | ||
bd555975 | 5115 | void btrfs_evict_inode(struct inode *inode) |
39279cc3 CM |
5116 | { |
5117 | struct btrfs_trans_handle *trans; | |
5118 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
726c35fa | 5119 | struct btrfs_block_rsv *rsv, *global_rsv; |
3bce876f | 5120 | int steal_from_global = 0; |
07127184 | 5121 | u64 min_size = btrfs_calc_trunc_metadata_size(root, 1); |
39279cc3 CM |
5122 | int ret; |
5123 | ||
1abe9b8a | 5124 | trace_btrfs_inode_evict(inode); |
5125 | ||
131e404a FDBM |
5126 | evict_inode_truncate_pages(inode); |
5127 | ||
69e9c6c6 SB |
5128 | if (inode->i_nlink && |
5129 | ((btrfs_root_refs(&root->root_item) != 0 && | |
5130 | root->root_key.objectid != BTRFS_ROOT_TREE_OBJECTID) || | |
5131 | btrfs_is_free_space_inode(inode))) | |
bd555975 AV |
5132 | goto no_delete; |
5133 | ||
39279cc3 | 5134 | if (is_bad_inode(inode)) { |
7b128766 | 5135 | btrfs_orphan_del(NULL, inode); |
39279cc3 CM |
5136 | goto no_delete; |
5137 | } | |
bd555975 | 5138 | /* do we really want it for ->i_nlink > 0 and zero btrfs_root_refs? */ |
a30e577c JM |
5139 | if (!special_file(inode->i_mode)) |
5140 | btrfs_wait_ordered_range(inode, 0, (u64)-1); | |
5f39d397 | 5141 | |
f612496b MX |
5142 | btrfs_free_io_failure_record(inode, 0, (u64)-1); |
5143 | ||
c71bf099 | 5144 | if (root->fs_info->log_root_recovering) { |
6bf02314 | 5145 | BUG_ON(test_bit(BTRFS_INODE_HAS_ORPHAN_ITEM, |
8a35d95f | 5146 | &BTRFS_I(inode)->runtime_flags)); |
c71bf099 YZ |
5147 | goto no_delete; |
5148 | } | |
5149 | ||
76dda93c | 5150 | if (inode->i_nlink > 0) { |
69e9c6c6 SB |
5151 | BUG_ON(btrfs_root_refs(&root->root_item) != 0 && |
5152 | root->root_key.objectid != BTRFS_ROOT_TREE_OBJECTID); | |
76dda93c YZ |
5153 | goto no_delete; |
5154 | } | |
5155 | ||
0e8c36a9 MX |
5156 | ret = btrfs_commit_inode_delayed_inode(inode); |
5157 | if (ret) { | |
5158 | btrfs_orphan_del(NULL, inode); | |
5159 | goto no_delete; | |
5160 | } | |
5161 | ||
66d8f3dd | 5162 | rsv = btrfs_alloc_block_rsv(root, BTRFS_BLOCK_RSV_TEMP); |
4289a667 JB |
5163 | if (!rsv) { |
5164 | btrfs_orphan_del(NULL, inode); | |
5165 | goto no_delete; | |
5166 | } | |
4a338542 | 5167 | rsv->size = min_size; |
ca7e70f5 | 5168 | rsv->failfast = 1; |
726c35fa | 5169 | global_rsv = &root->fs_info->global_block_rsv; |
4289a667 | 5170 | |
dbe674a9 | 5171 | btrfs_i_size_write(inode, 0); |
5f39d397 | 5172 | |
4289a667 | 5173 | /* |
8407aa46 MX |
5174 | * This is a bit simpler than btrfs_truncate since we've already |
5175 | * reserved our space for our orphan item in the unlink, so we just | |
5176 | * need to reserve some slack space in case we add bytes and update | |
5177 | * inode item when doing the truncate. | |
4289a667 | 5178 | */ |
8082510e | 5179 | while (1) { |
08e007d2 MX |
5180 | ret = btrfs_block_rsv_refill(root, rsv, min_size, |
5181 | BTRFS_RESERVE_FLUSH_LIMIT); | |
726c35fa JB |
5182 | |
5183 | /* | |
5184 | * Try and steal from the global reserve since we will | |
5185 | * likely not use this space anyway, we want to try as | |
5186 | * hard as possible to get this to work. | |
5187 | */ | |
5188 | if (ret) | |
3bce876f JB |
5189 | steal_from_global++; |
5190 | else | |
5191 | steal_from_global = 0; | |
5192 | ret = 0; | |
d68fc57b | 5193 | |
3bce876f JB |
5194 | /* |
5195 | * steal_from_global == 0: we reserved stuff, hooray! | |
5196 | * steal_from_global == 1: we didn't reserve stuff, boo! | |
5197 | * steal_from_global == 2: we've committed, still not a lot of | |
5198 | * room but maybe we'll have room in the global reserve this | |
5199 | * time. | |
5200 | * steal_from_global == 3: abandon all hope! | |
5201 | */ | |
5202 | if (steal_from_global > 2) { | |
c2cf52eb SK |
5203 | btrfs_warn(root->fs_info, |
5204 | "Could not get space for a delete, will truncate on mount %d", | |
5205 | ret); | |
4289a667 JB |
5206 | btrfs_orphan_del(NULL, inode); |
5207 | btrfs_free_block_rsv(root, rsv); | |
5208 | goto no_delete; | |
d68fc57b | 5209 | } |
7b128766 | 5210 | |
0e8c36a9 | 5211 | trans = btrfs_join_transaction(root); |
4289a667 JB |
5212 | if (IS_ERR(trans)) { |
5213 | btrfs_orphan_del(NULL, inode); | |
5214 | btrfs_free_block_rsv(root, rsv); | |
5215 | goto no_delete; | |
d68fc57b | 5216 | } |
7b128766 | 5217 | |
3bce876f JB |
5218 | /* |
5219 | * We can't just steal from the global reserve, we need tomake | |
5220 | * sure there is room to do it, if not we need to commit and try | |
5221 | * again. | |
5222 | */ | |
5223 | if (steal_from_global) { | |
5224 | if (!btrfs_check_space_for_delayed_refs(trans, root)) | |
5225 | ret = btrfs_block_rsv_migrate(global_rsv, rsv, | |
5226 | min_size); | |
5227 | else | |
5228 | ret = -ENOSPC; | |
5229 | } | |
5230 | ||
5231 | /* | |
5232 | * Couldn't steal from the global reserve, we have too much | |
5233 | * pending stuff built up, commit the transaction and try it | |
5234 | * again. | |
5235 | */ | |
5236 | if (ret) { | |
5237 | ret = btrfs_commit_transaction(trans, root); | |
5238 | if (ret) { | |
5239 | btrfs_orphan_del(NULL, inode); | |
5240 | btrfs_free_block_rsv(root, rsv); | |
5241 | goto no_delete; | |
5242 | } | |
5243 | continue; | |
5244 | } else { | |
5245 | steal_from_global = 0; | |
5246 | } | |
5247 | ||
4289a667 JB |
5248 | trans->block_rsv = rsv; |
5249 | ||
d68fc57b | 5250 | ret = btrfs_truncate_inode_items(trans, root, inode, 0, 0); |
28ed1345 | 5251 | if (ret != -ENOSPC && ret != -EAGAIN) |
8082510e | 5252 | break; |
85e21bac | 5253 | |
8407aa46 | 5254 | trans->block_rsv = &root->fs_info->trans_block_rsv; |
8082510e YZ |
5255 | btrfs_end_transaction(trans, root); |
5256 | trans = NULL; | |
b53d3f5d | 5257 | btrfs_btree_balance_dirty(root); |
8082510e | 5258 | } |
5f39d397 | 5259 | |
4289a667 JB |
5260 | btrfs_free_block_rsv(root, rsv); |
5261 | ||
4ef31a45 JB |
5262 | /* |
5263 | * Errors here aren't a big deal, it just means we leave orphan items | |
5264 | * in the tree. They will be cleaned up on the next mount. | |
5265 | */ | |
8082510e | 5266 | if (ret == 0) { |
4289a667 | 5267 | trans->block_rsv = root->orphan_block_rsv; |
4ef31a45 JB |
5268 | btrfs_orphan_del(trans, inode); |
5269 | } else { | |
5270 | btrfs_orphan_del(NULL, inode); | |
8082510e | 5271 | } |
54aa1f4d | 5272 | |
4289a667 | 5273 | trans->block_rsv = &root->fs_info->trans_block_rsv; |
581bb050 LZ |
5274 | if (!(root == root->fs_info->tree_root || |
5275 | root->root_key.objectid == BTRFS_TREE_RELOC_OBJECTID)) | |
33345d01 | 5276 | btrfs_return_ino(root, btrfs_ino(inode)); |
581bb050 | 5277 | |
54aa1f4d | 5278 | btrfs_end_transaction(trans, root); |
b53d3f5d | 5279 | btrfs_btree_balance_dirty(root); |
39279cc3 | 5280 | no_delete: |
89042e5a | 5281 | btrfs_remove_delayed_node(inode); |
dbd5768f | 5282 | clear_inode(inode); |
39279cc3 CM |
5283 | } |
5284 | ||
5285 | /* | |
5286 | * this returns the key found in the dir entry in the location pointer. | |
5287 | * If no dir entries were found, location->objectid is 0. | |
5288 | */ | |
5289 | static int btrfs_inode_by_name(struct inode *dir, struct dentry *dentry, | |
5290 | struct btrfs_key *location) | |
5291 | { | |
5292 | const char *name = dentry->d_name.name; | |
5293 | int namelen = dentry->d_name.len; | |
5294 | struct btrfs_dir_item *di; | |
5295 | struct btrfs_path *path; | |
5296 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
0d9f7f3e | 5297 | int ret = 0; |
39279cc3 CM |
5298 | |
5299 | path = btrfs_alloc_path(); | |
d8926bb3 MF |
5300 | if (!path) |
5301 | return -ENOMEM; | |
3954401f | 5302 | |
33345d01 | 5303 | di = btrfs_lookup_dir_item(NULL, root, path, btrfs_ino(dir), name, |
39279cc3 | 5304 | namelen, 0); |
0d9f7f3e Y |
5305 | if (IS_ERR(di)) |
5306 | ret = PTR_ERR(di); | |
d397712b | 5307 | |
c704005d | 5308 | if (IS_ERR_OR_NULL(di)) |
3954401f | 5309 | goto out_err; |
d397712b | 5310 | |
5f39d397 | 5311 | btrfs_dir_item_key_to_cpu(path->nodes[0], di, location); |
39279cc3 | 5312 | out: |
39279cc3 CM |
5313 | btrfs_free_path(path); |
5314 | return ret; | |
3954401f CM |
5315 | out_err: |
5316 | location->objectid = 0; | |
5317 | goto out; | |
39279cc3 CM |
5318 | } |
5319 | ||
5320 | /* | |
5321 | * when we hit a tree root in a directory, the btrfs part of the inode | |
5322 | * needs to be changed to reflect the root directory of the tree root. This | |
5323 | * is kind of like crossing a mount point. | |
5324 | */ | |
5325 | static int fixup_tree_root_location(struct btrfs_root *root, | |
4df27c4d YZ |
5326 | struct inode *dir, |
5327 | struct dentry *dentry, | |
5328 | struct btrfs_key *location, | |
5329 | struct btrfs_root **sub_root) | |
39279cc3 | 5330 | { |
4df27c4d YZ |
5331 | struct btrfs_path *path; |
5332 | struct btrfs_root *new_root; | |
5333 | struct btrfs_root_ref *ref; | |
5334 | struct extent_buffer *leaf; | |
1d4c08e0 | 5335 | struct btrfs_key key; |
4df27c4d YZ |
5336 | int ret; |
5337 | int err = 0; | |
39279cc3 | 5338 | |
4df27c4d YZ |
5339 | path = btrfs_alloc_path(); |
5340 | if (!path) { | |
5341 | err = -ENOMEM; | |
5342 | goto out; | |
5343 | } | |
39279cc3 | 5344 | |
4df27c4d | 5345 | err = -ENOENT; |
1d4c08e0 DS |
5346 | key.objectid = BTRFS_I(dir)->root->root_key.objectid; |
5347 | key.type = BTRFS_ROOT_REF_KEY; | |
5348 | key.offset = location->objectid; | |
5349 | ||
5350 | ret = btrfs_search_slot(NULL, root->fs_info->tree_root, &key, path, | |
5351 | 0, 0); | |
4df27c4d YZ |
5352 | if (ret) { |
5353 | if (ret < 0) | |
5354 | err = ret; | |
5355 | goto out; | |
5356 | } | |
39279cc3 | 5357 | |
4df27c4d YZ |
5358 | leaf = path->nodes[0]; |
5359 | ref = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_root_ref); | |
33345d01 | 5360 | if (btrfs_root_ref_dirid(leaf, ref) != btrfs_ino(dir) || |
4df27c4d YZ |
5361 | btrfs_root_ref_name_len(leaf, ref) != dentry->d_name.len) |
5362 | goto out; | |
39279cc3 | 5363 | |
4df27c4d YZ |
5364 | ret = memcmp_extent_buffer(leaf, dentry->d_name.name, |
5365 | (unsigned long)(ref + 1), | |
5366 | dentry->d_name.len); | |
5367 | if (ret) | |
5368 | goto out; | |
5369 | ||
b3b4aa74 | 5370 | btrfs_release_path(path); |
4df27c4d YZ |
5371 | |
5372 | new_root = btrfs_read_fs_root_no_name(root->fs_info, location); | |
5373 | if (IS_ERR(new_root)) { | |
5374 | err = PTR_ERR(new_root); | |
5375 | goto out; | |
5376 | } | |
5377 | ||
4df27c4d YZ |
5378 | *sub_root = new_root; |
5379 | location->objectid = btrfs_root_dirid(&new_root->root_item); | |
5380 | location->type = BTRFS_INODE_ITEM_KEY; | |
5381 | location->offset = 0; | |
5382 | err = 0; | |
5383 | out: | |
5384 | btrfs_free_path(path); | |
5385 | return err; | |
39279cc3 CM |
5386 | } |
5387 | ||
5d4f98a2 YZ |
5388 | static void inode_tree_add(struct inode *inode) |
5389 | { | |
5390 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
5391 | struct btrfs_inode *entry; | |
03e860bd NP |
5392 | struct rb_node **p; |
5393 | struct rb_node *parent; | |
cef21937 | 5394 | struct rb_node *new = &BTRFS_I(inode)->rb_node; |
33345d01 | 5395 | u64 ino = btrfs_ino(inode); |
5d4f98a2 | 5396 | |
1d3382cb | 5397 | if (inode_unhashed(inode)) |
76dda93c | 5398 | return; |
e1409cef | 5399 | parent = NULL; |
5d4f98a2 | 5400 | spin_lock(&root->inode_lock); |
e1409cef | 5401 | p = &root->inode_tree.rb_node; |
5d4f98a2 YZ |
5402 | while (*p) { |
5403 | parent = *p; | |
5404 | entry = rb_entry(parent, struct btrfs_inode, rb_node); | |
5405 | ||
33345d01 | 5406 | if (ino < btrfs_ino(&entry->vfs_inode)) |
03e860bd | 5407 | p = &parent->rb_left; |
33345d01 | 5408 | else if (ino > btrfs_ino(&entry->vfs_inode)) |
03e860bd | 5409 | p = &parent->rb_right; |
5d4f98a2 YZ |
5410 | else { |
5411 | WARN_ON(!(entry->vfs_inode.i_state & | |
a4ffdde6 | 5412 | (I_WILL_FREE | I_FREEING))); |
cef21937 | 5413 | rb_replace_node(parent, new, &root->inode_tree); |
03e860bd NP |
5414 | RB_CLEAR_NODE(parent); |
5415 | spin_unlock(&root->inode_lock); | |
cef21937 | 5416 | return; |
5d4f98a2 YZ |
5417 | } |
5418 | } | |
cef21937 FDBM |
5419 | rb_link_node(new, parent, p); |
5420 | rb_insert_color(new, &root->inode_tree); | |
5d4f98a2 YZ |
5421 | spin_unlock(&root->inode_lock); |
5422 | } | |
5423 | ||
5424 | static void inode_tree_del(struct inode *inode) | |
5425 | { | |
5426 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
76dda93c | 5427 | int empty = 0; |
5d4f98a2 | 5428 | |
03e860bd | 5429 | spin_lock(&root->inode_lock); |
5d4f98a2 | 5430 | if (!RB_EMPTY_NODE(&BTRFS_I(inode)->rb_node)) { |
5d4f98a2 | 5431 | rb_erase(&BTRFS_I(inode)->rb_node, &root->inode_tree); |
5d4f98a2 | 5432 | RB_CLEAR_NODE(&BTRFS_I(inode)->rb_node); |
76dda93c | 5433 | empty = RB_EMPTY_ROOT(&root->inode_tree); |
5d4f98a2 | 5434 | } |
03e860bd | 5435 | spin_unlock(&root->inode_lock); |
76dda93c | 5436 | |
69e9c6c6 | 5437 | if (empty && btrfs_root_refs(&root->root_item) == 0) { |
76dda93c YZ |
5438 | synchronize_srcu(&root->fs_info->subvol_srcu); |
5439 | spin_lock(&root->inode_lock); | |
5440 | empty = RB_EMPTY_ROOT(&root->inode_tree); | |
5441 | spin_unlock(&root->inode_lock); | |
5442 | if (empty) | |
5443 | btrfs_add_dead_root(root); | |
5444 | } | |
5445 | } | |
5446 | ||
143bede5 | 5447 | void btrfs_invalidate_inodes(struct btrfs_root *root) |
76dda93c YZ |
5448 | { |
5449 | struct rb_node *node; | |
5450 | struct rb_node *prev; | |
5451 | struct btrfs_inode *entry; | |
5452 | struct inode *inode; | |
5453 | u64 objectid = 0; | |
5454 | ||
7813b3db LB |
5455 | if (!test_bit(BTRFS_FS_STATE_ERROR, &root->fs_info->fs_state)) |
5456 | WARN_ON(btrfs_root_refs(&root->root_item) != 0); | |
76dda93c YZ |
5457 | |
5458 | spin_lock(&root->inode_lock); | |
5459 | again: | |
5460 | node = root->inode_tree.rb_node; | |
5461 | prev = NULL; | |
5462 | while (node) { | |
5463 | prev = node; | |
5464 | entry = rb_entry(node, struct btrfs_inode, rb_node); | |
5465 | ||
33345d01 | 5466 | if (objectid < btrfs_ino(&entry->vfs_inode)) |
76dda93c | 5467 | node = node->rb_left; |
33345d01 | 5468 | else if (objectid > btrfs_ino(&entry->vfs_inode)) |
76dda93c YZ |
5469 | node = node->rb_right; |
5470 | else | |
5471 | break; | |
5472 | } | |
5473 | if (!node) { | |
5474 | while (prev) { | |
5475 | entry = rb_entry(prev, struct btrfs_inode, rb_node); | |
33345d01 | 5476 | if (objectid <= btrfs_ino(&entry->vfs_inode)) { |
76dda93c YZ |
5477 | node = prev; |
5478 | break; | |
5479 | } | |
5480 | prev = rb_next(prev); | |
5481 | } | |
5482 | } | |
5483 | while (node) { | |
5484 | entry = rb_entry(node, struct btrfs_inode, rb_node); | |
33345d01 | 5485 | objectid = btrfs_ino(&entry->vfs_inode) + 1; |
76dda93c YZ |
5486 | inode = igrab(&entry->vfs_inode); |
5487 | if (inode) { | |
5488 | spin_unlock(&root->inode_lock); | |
5489 | if (atomic_read(&inode->i_count) > 1) | |
5490 | d_prune_aliases(inode); | |
5491 | /* | |
45321ac5 | 5492 | * btrfs_drop_inode will have it removed from |
76dda93c YZ |
5493 | * the inode cache when its usage count |
5494 | * hits zero. | |
5495 | */ | |
5496 | iput(inode); | |
5497 | cond_resched(); | |
5498 | spin_lock(&root->inode_lock); | |
5499 | goto again; | |
5500 | } | |
5501 | ||
5502 | if (cond_resched_lock(&root->inode_lock)) | |
5503 | goto again; | |
5504 | ||
5505 | node = rb_next(node); | |
5506 | } | |
5507 | spin_unlock(&root->inode_lock); | |
5d4f98a2 YZ |
5508 | } |
5509 | ||
e02119d5 CM |
5510 | static int btrfs_init_locked_inode(struct inode *inode, void *p) |
5511 | { | |
5512 | struct btrfs_iget_args *args = p; | |
90d3e592 CM |
5513 | inode->i_ino = args->location->objectid; |
5514 | memcpy(&BTRFS_I(inode)->location, args->location, | |
5515 | sizeof(*args->location)); | |
e02119d5 | 5516 | BTRFS_I(inode)->root = args->root; |
39279cc3 CM |
5517 | return 0; |
5518 | } | |
5519 | ||
5520 | static int btrfs_find_actor(struct inode *inode, void *opaque) | |
5521 | { | |
5522 | struct btrfs_iget_args *args = opaque; | |
90d3e592 | 5523 | return args->location->objectid == BTRFS_I(inode)->location.objectid && |
d397712b | 5524 | args->root == BTRFS_I(inode)->root; |
39279cc3 CM |
5525 | } |
5526 | ||
5d4f98a2 | 5527 | static struct inode *btrfs_iget_locked(struct super_block *s, |
90d3e592 | 5528 | struct btrfs_key *location, |
5d4f98a2 | 5529 | struct btrfs_root *root) |
39279cc3 CM |
5530 | { |
5531 | struct inode *inode; | |
5532 | struct btrfs_iget_args args; | |
90d3e592 | 5533 | unsigned long hashval = btrfs_inode_hash(location->objectid, root); |
778ba82b | 5534 | |
90d3e592 | 5535 | args.location = location; |
39279cc3 CM |
5536 | args.root = root; |
5537 | ||
778ba82b | 5538 | inode = iget5_locked(s, hashval, btrfs_find_actor, |
39279cc3 CM |
5539 | btrfs_init_locked_inode, |
5540 | (void *)&args); | |
5541 | return inode; | |
5542 | } | |
5543 | ||
1a54ef8c BR |
5544 | /* Get an inode object given its location and corresponding root. |
5545 | * Returns in *is_new if the inode was read from disk | |
5546 | */ | |
5547 | struct inode *btrfs_iget(struct super_block *s, struct btrfs_key *location, | |
73f73415 | 5548 | struct btrfs_root *root, int *new) |
1a54ef8c BR |
5549 | { |
5550 | struct inode *inode; | |
5551 | ||
90d3e592 | 5552 | inode = btrfs_iget_locked(s, location, root); |
1a54ef8c | 5553 | if (!inode) |
5d4f98a2 | 5554 | return ERR_PTR(-ENOMEM); |
1a54ef8c BR |
5555 | |
5556 | if (inode->i_state & I_NEW) { | |
1a54ef8c | 5557 | btrfs_read_locked_inode(inode); |
1748f843 MF |
5558 | if (!is_bad_inode(inode)) { |
5559 | inode_tree_add(inode); | |
5560 | unlock_new_inode(inode); | |
5561 | if (new) | |
5562 | *new = 1; | |
5563 | } else { | |
e0b6d65b ST |
5564 | unlock_new_inode(inode); |
5565 | iput(inode); | |
5566 | inode = ERR_PTR(-ESTALE); | |
1748f843 MF |
5567 | } |
5568 | } | |
5569 | ||
1a54ef8c BR |
5570 | return inode; |
5571 | } | |
5572 | ||
4df27c4d YZ |
5573 | static struct inode *new_simple_dir(struct super_block *s, |
5574 | struct btrfs_key *key, | |
5575 | struct btrfs_root *root) | |
5576 | { | |
5577 | struct inode *inode = new_inode(s); | |
5578 | ||
5579 | if (!inode) | |
5580 | return ERR_PTR(-ENOMEM); | |
5581 | ||
4df27c4d YZ |
5582 | BTRFS_I(inode)->root = root; |
5583 | memcpy(&BTRFS_I(inode)->location, key, sizeof(*key)); | |
72ac3c0d | 5584 | set_bit(BTRFS_INODE_DUMMY, &BTRFS_I(inode)->runtime_flags); |
4df27c4d YZ |
5585 | |
5586 | inode->i_ino = BTRFS_EMPTY_SUBVOL_DIR_OBJECTID; | |
848cce0d | 5587 | inode->i_op = &btrfs_dir_ro_inode_operations; |
4df27c4d YZ |
5588 | inode->i_fop = &simple_dir_operations; |
5589 | inode->i_mode = S_IFDIR | S_IRUGO | S_IWUSR | S_IXUGO; | |
9cc97d64 | 5590 | inode->i_mtime = CURRENT_TIME; |
5591 | inode->i_atime = inode->i_mtime; | |
5592 | inode->i_ctime = inode->i_mtime; | |
5593 | BTRFS_I(inode)->i_otime = inode->i_mtime; | |
4df27c4d YZ |
5594 | |
5595 | return inode; | |
5596 | } | |
5597 | ||
3de4586c | 5598 | struct inode *btrfs_lookup_dentry(struct inode *dir, struct dentry *dentry) |
39279cc3 | 5599 | { |
d397712b | 5600 | struct inode *inode; |
4df27c4d | 5601 | struct btrfs_root *root = BTRFS_I(dir)->root; |
39279cc3 CM |
5602 | struct btrfs_root *sub_root = root; |
5603 | struct btrfs_key location; | |
76dda93c | 5604 | int index; |
b4aff1f8 | 5605 | int ret = 0; |
39279cc3 CM |
5606 | |
5607 | if (dentry->d_name.len > BTRFS_NAME_LEN) | |
5608 | return ERR_PTR(-ENAMETOOLONG); | |
5f39d397 | 5609 | |
39e3c955 | 5610 | ret = btrfs_inode_by_name(dir, dentry, &location); |
39279cc3 CM |
5611 | if (ret < 0) |
5612 | return ERR_PTR(ret); | |
5f39d397 | 5613 | |
4df27c4d | 5614 | if (location.objectid == 0) |
5662344b | 5615 | return ERR_PTR(-ENOENT); |
4df27c4d YZ |
5616 | |
5617 | if (location.type == BTRFS_INODE_ITEM_KEY) { | |
73f73415 | 5618 | inode = btrfs_iget(dir->i_sb, &location, root, NULL); |
4df27c4d YZ |
5619 | return inode; |
5620 | } | |
5621 | ||
5622 | BUG_ON(location.type != BTRFS_ROOT_ITEM_KEY); | |
5623 | ||
76dda93c | 5624 | index = srcu_read_lock(&root->fs_info->subvol_srcu); |
4df27c4d YZ |
5625 | ret = fixup_tree_root_location(root, dir, dentry, |
5626 | &location, &sub_root); | |
5627 | if (ret < 0) { | |
5628 | if (ret != -ENOENT) | |
5629 | inode = ERR_PTR(ret); | |
5630 | else | |
5631 | inode = new_simple_dir(dir->i_sb, &location, sub_root); | |
5632 | } else { | |
73f73415 | 5633 | inode = btrfs_iget(dir->i_sb, &location, sub_root, NULL); |
39279cc3 | 5634 | } |
76dda93c YZ |
5635 | srcu_read_unlock(&root->fs_info->subvol_srcu, index); |
5636 | ||
34d19bad | 5637 | if (!IS_ERR(inode) && root != sub_root) { |
c71bf099 YZ |
5638 | down_read(&root->fs_info->cleanup_work_sem); |
5639 | if (!(inode->i_sb->s_flags & MS_RDONLY)) | |
66b4ffd1 | 5640 | ret = btrfs_orphan_cleanup(sub_root); |
c71bf099 | 5641 | up_read(&root->fs_info->cleanup_work_sem); |
01cd3367 JB |
5642 | if (ret) { |
5643 | iput(inode); | |
66b4ffd1 | 5644 | inode = ERR_PTR(ret); |
01cd3367 | 5645 | } |
c71bf099 YZ |
5646 | } |
5647 | ||
3de4586c CM |
5648 | return inode; |
5649 | } | |
5650 | ||
fe15ce44 | 5651 | static int btrfs_dentry_delete(const struct dentry *dentry) |
76dda93c YZ |
5652 | { |
5653 | struct btrfs_root *root; | |
2b0143b5 | 5654 | struct inode *inode = d_inode(dentry); |
76dda93c | 5655 | |
848cce0d | 5656 | if (!inode && !IS_ROOT(dentry)) |
2b0143b5 | 5657 | inode = d_inode(dentry->d_parent); |
76dda93c | 5658 | |
848cce0d LZ |
5659 | if (inode) { |
5660 | root = BTRFS_I(inode)->root; | |
efefb143 YZ |
5661 | if (btrfs_root_refs(&root->root_item) == 0) |
5662 | return 1; | |
848cce0d LZ |
5663 | |
5664 | if (btrfs_ino(inode) == BTRFS_EMPTY_SUBVOL_DIR_OBJECTID) | |
5665 | return 1; | |
efefb143 | 5666 | } |
76dda93c YZ |
5667 | return 0; |
5668 | } | |
5669 | ||
b4aff1f8 JB |
5670 | static void btrfs_dentry_release(struct dentry *dentry) |
5671 | { | |
944a4515 | 5672 | kfree(dentry->d_fsdata); |
b4aff1f8 JB |
5673 | } |
5674 | ||
3de4586c | 5675 | static struct dentry *btrfs_lookup(struct inode *dir, struct dentry *dentry, |
00cd8dd3 | 5676 | unsigned int flags) |
3de4586c | 5677 | { |
5662344b | 5678 | struct inode *inode; |
a66e7cc6 | 5679 | |
5662344b TI |
5680 | inode = btrfs_lookup_dentry(dir, dentry); |
5681 | if (IS_ERR(inode)) { | |
5682 | if (PTR_ERR(inode) == -ENOENT) | |
5683 | inode = NULL; | |
5684 | else | |
5685 | return ERR_CAST(inode); | |
5686 | } | |
5687 | ||
41d28bca | 5688 | return d_splice_alias(inode, dentry); |
39279cc3 CM |
5689 | } |
5690 | ||
16cdcec7 | 5691 | unsigned char btrfs_filetype_table[] = { |
39279cc3 CM |
5692 | DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK |
5693 | }; | |
5694 | ||
9cdda8d3 | 5695 | static int btrfs_real_readdir(struct file *file, struct dir_context *ctx) |
39279cc3 | 5696 | { |
9cdda8d3 | 5697 | struct inode *inode = file_inode(file); |
39279cc3 CM |
5698 | struct btrfs_root *root = BTRFS_I(inode)->root; |
5699 | struct btrfs_item *item; | |
5700 | struct btrfs_dir_item *di; | |
5701 | struct btrfs_key key; | |
5f39d397 | 5702 | struct btrfs_key found_key; |
39279cc3 | 5703 | struct btrfs_path *path; |
16cdcec7 MX |
5704 | struct list_head ins_list; |
5705 | struct list_head del_list; | |
39279cc3 | 5706 | int ret; |
5f39d397 | 5707 | struct extent_buffer *leaf; |
39279cc3 | 5708 | int slot; |
39279cc3 CM |
5709 | unsigned char d_type; |
5710 | int over = 0; | |
5711 | u32 di_cur; | |
5712 | u32 di_total; | |
5713 | u32 di_len; | |
5714 | int key_type = BTRFS_DIR_INDEX_KEY; | |
5f39d397 CM |
5715 | char tmp_name[32]; |
5716 | char *name_ptr; | |
5717 | int name_len; | |
9cdda8d3 | 5718 | int is_curr = 0; /* ctx->pos points to the current index? */ |
39279cc3 CM |
5719 | |
5720 | /* FIXME, use a real flag for deciding about the key type */ | |
5721 | if (root->fs_info->tree_root == root) | |
5722 | key_type = BTRFS_DIR_ITEM_KEY; | |
5f39d397 | 5723 | |
9cdda8d3 AV |
5724 | if (!dir_emit_dots(file, ctx)) |
5725 | return 0; | |
5726 | ||
49593bfa | 5727 | path = btrfs_alloc_path(); |
16cdcec7 MX |
5728 | if (!path) |
5729 | return -ENOMEM; | |
ff5714cc | 5730 | |
e4058b54 | 5731 | path->reada = READA_FORWARD; |
49593bfa | 5732 | |
16cdcec7 MX |
5733 | if (key_type == BTRFS_DIR_INDEX_KEY) { |
5734 | INIT_LIST_HEAD(&ins_list); | |
5735 | INIT_LIST_HEAD(&del_list); | |
5736 | btrfs_get_delayed_items(inode, &ins_list, &del_list); | |
5737 | } | |
5738 | ||
962a298f | 5739 | key.type = key_type; |
9cdda8d3 | 5740 | key.offset = ctx->pos; |
33345d01 | 5741 | key.objectid = btrfs_ino(inode); |
5f39d397 | 5742 | |
39279cc3 CM |
5743 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); |
5744 | if (ret < 0) | |
5745 | goto err; | |
49593bfa DW |
5746 | |
5747 | while (1) { | |
5f39d397 | 5748 | leaf = path->nodes[0]; |
39279cc3 | 5749 | slot = path->slots[0]; |
b9e03af0 LZ |
5750 | if (slot >= btrfs_header_nritems(leaf)) { |
5751 | ret = btrfs_next_leaf(root, path); | |
5752 | if (ret < 0) | |
5753 | goto err; | |
5754 | else if (ret > 0) | |
5755 | break; | |
5756 | continue; | |
39279cc3 | 5757 | } |
3de4586c | 5758 | |
dd3cc16b | 5759 | item = btrfs_item_nr(slot); |
5f39d397 CM |
5760 | btrfs_item_key_to_cpu(leaf, &found_key, slot); |
5761 | ||
5762 | if (found_key.objectid != key.objectid) | |
39279cc3 | 5763 | break; |
962a298f | 5764 | if (found_key.type != key_type) |
39279cc3 | 5765 | break; |
9cdda8d3 | 5766 | if (found_key.offset < ctx->pos) |
b9e03af0 | 5767 | goto next; |
16cdcec7 MX |
5768 | if (key_type == BTRFS_DIR_INDEX_KEY && |
5769 | btrfs_should_delete_dir_index(&del_list, | |
5770 | found_key.offset)) | |
5771 | goto next; | |
5f39d397 | 5772 | |
9cdda8d3 | 5773 | ctx->pos = found_key.offset; |
16cdcec7 | 5774 | is_curr = 1; |
49593bfa | 5775 | |
39279cc3 CM |
5776 | di = btrfs_item_ptr(leaf, slot, struct btrfs_dir_item); |
5777 | di_cur = 0; | |
5f39d397 | 5778 | di_total = btrfs_item_size(leaf, item); |
49593bfa DW |
5779 | |
5780 | while (di_cur < di_total) { | |
5f39d397 CM |
5781 | struct btrfs_key location; |
5782 | ||
22a94d44 JB |
5783 | if (verify_dir_item(root, leaf, di)) |
5784 | break; | |
5785 | ||
5f39d397 | 5786 | name_len = btrfs_dir_name_len(leaf, di); |
49593bfa | 5787 | if (name_len <= sizeof(tmp_name)) { |
5f39d397 CM |
5788 | name_ptr = tmp_name; |
5789 | } else { | |
5790 | name_ptr = kmalloc(name_len, GFP_NOFS); | |
49593bfa DW |
5791 | if (!name_ptr) { |
5792 | ret = -ENOMEM; | |
5793 | goto err; | |
5794 | } | |
5f39d397 CM |
5795 | } |
5796 | read_extent_buffer(leaf, name_ptr, | |
5797 | (unsigned long)(di + 1), name_len); | |
5798 | ||
5799 | d_type = btrfs_filetype_table[btrfs_dir_type(leaf, di)]; | |
5800 | btrfs_dir_item_key_to_cpu(leaf, di, &location); | |
3de4586c | 5801 | |
fede766f | 5802 | |
3de4586c | 5803 | /* is this a reference to our own snapshot? If so |
8c9c2bf7 AJ |
5804 | * skip it. |
5805 | * | |
5806 | * In contrast to old kernels, we insert the snapshot's | |
5807 | * dir item and dir index after it has been created, so | |
5808 | * we won't find a reference to our own snapshot. We | |
5809 | * still keep the following code for backward | |
5810 | * compatibility. | |
3de4586c CM |
5811 | */ |
5812 | if (location.type == BTRFS_ROOT_ITEM_KEY && | |
5813 | location.objectid == root->root_key.objectid) { | |
5814 | over = 0; | |
5815 | goto skip; | |
5816 | } | |
9cdda8d3 AV |
5817 | over = !dir_emit(ctx, name_ptr, name_len, |
5818 | location.objectid, d_type); | |
5f39d397 | 5819 | |
3de4586c | 5820 | skip: |
5f39d397 CM |
5821 | if (name_ptr != tmp_name) |
5822 | kfree(name_ptr); | |
5823 | ||
39279cc3 CM |
5824 | if (over) |
5825 | goto nopos; | |
5103e947 | 5826 | di_len = btrfs_dir_name_len(leaf, di) + |
49593bfa | 5827 | btrfs_dir_data_len(leaf, di) + sizeof(*di); |
39279cc3 CM |
5828 | di_cur += di_len; |
5829 | di = (struct btrfs_dir_item *)((char *)di + di_len); | |
5830 | } | |
b9e03af0 LZ |
5831 | next: |
5832 | path->slots[0]++; | |
39279cc3 | 5833 | } |
49593bfa | 5834 | |
16cdcec7 MX |
5835 | if (key_type == BTRFS_DIR_INDEX_KEY) { |
5836 | if (is_curr) | |
9cdda8d3 AV |
5837 | ctx->pos++; |
5838 | ret = btrfs_readdir_delayed_dir_index(ctx, &ins_list); | |
16cdcec7 MX |
5839 | if (ret) |
5840 | goto nopos; | |
5841 | } | |
5842 | ||
49593bfa | 5843 | /* Reached end of directory/root. Bump pos past the last item. */ |
db62efbb ZB |
5844 | ctx->pos++; |
5845 | ||
5846 | /* | |
5847 | * Stop new entries from being returned after we return the last | |
5848 | * entry. | |
5849 | * | |
5850 | * New directory entries are assigned a strictly increasing | |
5851 | * offset. This means that new entries created during readdir | |
5852 | * are *guaranteed* to be seen in the future by that readdir. | |
5853 | * This has broken buggy programs which operate on names as | |
5854 | * they're returned by readdir. Until we re-use freed offsets | |
5855 | * we have this hack to stop new entries from being returned | |
5856 | * under the assumption that they'll never reach this huge | |
5857 | * offset. | |
5858 | * | |
5859 | * This is being careful not to overflow 32bit loff_t unless the | |
5860 | * last entry requires it because doing so has broken 32bit apps | |
5861 | * in the past. | |
5862 | */ | |
5863 | if (key_type == BTRFS_DIR_INDEX_KEY) { | |
5864 | if (ctx->pos >= INT_MAX) | |
5865 | ctx->pos = LLONG_MAX; | |
5866 | else | |
5867 | ctx->pos = INT_MAX; | |
5868 | } | |
39279cc3 CM |
5869 | nopos: |
5870 | ret = 0; | |
5871 | err: | |
16cdcec7 MX |
5872 | if (key_type == BTRFS_DIR_INDEX_KEY) |
5873 | btrfs_put_delayed_items(&ins_list, &del_list); | |
39279cc3 | 5874 | btrfs_free_path(path); |
39279cc3 CM |
5875 | return ret; |
5876 | } | |
5877 | ||
a9185b41 | 5878 | int btrfs_write_inode(struct inode *inode, struct writeback_control *wbc) |
39279cc3 CM |
5879 | { |
5880 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
5881 | struct btrfs_trans_handle *trans; | |
5882 | int ret = 0; | |
0af3d00b | 5883 | bool nolock = false; |
39279cc3 | 5884 | |
72ac3c0d | 5885 | if (test_bit(BTRFS_INODE_DUMMY, &BTRFS_I(inode)->runtime_flags)) |
4ca8b41e CM |
5886 | return 0; |
5887 | ||
83eea1f1 | 5888 | if (btrfs_fs_closing(root->fs_info) && btrfs_is_free_space_inode(inode)) |
82d5902d | 5889 | nolock = true; |
0af3d00b | 5890 | |
a9185b41 | 5891 | if (wbc->sync_mode == WB_SYNC_ALL) { |
0af3d00b | 5892 | if (nolock) |
7a7eaa40 | 5893 | trans = btrfs_join_transaction_nolock(root); |
0af3d00b | 5894 | else |
7a7eaa40 | 5895 | trans = btrfs_join_transaction(root); |
3612b495 TI |
5896 | if (IS_ERR(trans)) |
5897 | return PTR_ERR(trans); | |
a698d075 | 5898 | ret = btrfs_commit_transaction(trans, root); |
39279cc3 CM |
5899 | } |
5900 | return ret; | |
5901 | } | |
5902 | ||
5903 | /* | |
54aa1f4d | 5904 | * This is somewhat expensive, updating the tree every time the |
39279cc3 CM |
5905 | * inode changes. But, it is most likely to find the inode in cache. |
5906 | * FIXME, needs more benchmarking...there are no reasons other than performance | |
5907 | * to keep or drop this code. | |
5908 | */ | |
48a3b636 | 5909 | static int btrfs_dirty_inode(struct inode *inode) |
39279cc3 CM |
5910 | { |
5911 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
5912 | struct btrfs_trans_handle *trans; | |
8929ecfa YZ |
5913 | int ret; |
5914 | ||
72ac3c0d | 5915 | if (test_bit(BTRFS_INODE_DUMMY, &BTRFS_I(inode)->runtime_flags)) |
22c44fe6 | 5916 | return 0; |
39279cc3 | 5917 | |
7a7eaa40 | 5918 | trans = btrfs_join_transaction(root); |
22c44fe6 JB |
5919 | if (IS_ERR(trans)) |
5920 | return PTR_ERR(trans); | |
8929ecfa YZ |
5921 | |
5922 | ret = btrfs_update_inode(trans, root, inode); | |
94b60442 CM |
5923 | if (ret && ret == -ENOSPC) { |
5924 | /* whoops, lets try again with the full transaction */ | |
5925 | btrfs_end_transaction(trans, root); | |
5926 | trans = btrfs_start_transaction(root, 1); | |
22c44fe6 JB |
5927 | if (IS_ERR(trans)) |
5928 | return PTR_ERR(trans); | |
8929ecfa | 5929 | |
94b60442 | 5930 | ret = btrfs_update_inode(trans, root, inode); |
94b60442 | 5931 | } |
39279cc3 | 5932 | btrfs_end_transaction(trans, root); |
16cdcec7 MX |
5933 | if (BTRFS_I(inode)->delayed_node) |
5934 | btrfs_balance_delayed_items(root); | |
22c44fe6 JB |
5935 | |
5936 | return ret; | |
5937 | } | |
5938 | ||
5939 | /* | |
5940 | * This is a copy of file_update_time. We need this so we can return error on | |
5941 | * ENOSPC for updating the inode in the case of file write and mmap writes. | |
5942 | */ | |
e41f941a JB |
5943 | static int btrfs_update_time(struct inode *inode, struct timespec *now, |
5944 | int flags) | |
22c44fe6 | 5945 | { |
2bc55652 AB |
5946 | struct btrfs_root *root = BTRFS_I(inode)->root; |
5947 | ||
5948 | if (btrfs_root_readonly(root)) | |
5949 | return -EROFS; | |
5950 | ||
e41f941a | 5951 | if (flags & S_VERSION) |
22c44fe6 | 5952 | inode_inc_iversion(inode); |
e41f941a JB |
5953 | if (flags & S_CTIME) |
5954 | inode->i_ctime = *now; | |
5955 | if (flags & S_MTIME) | |
5956 | inode->i_mtime = *now; | |
5957 | if (flags & S_ATIME) | |
5958 | inode->i_atime = *now; | |
5959 | return btrfs_dirty_inode(inode); | |
39279cc3 CM |
5960 | } |
5961 | ||
d352ac68 CM |
5962 | /* |
5963 | * find the highest existing sequence number in a directory | |
5964 | * and then set the in-memory index_cnt variable to reflect | |
5965 | * free sequence numbers | |
5966 | */ | |
aec7477b JB |
5967 | static int btrfs_set_inode_index_count(struct inode *inode) |
5968 | { | |
5969 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
5970 | struct btrfs_key key, found_key; | |
5971 | struct btrfs_path *path; | |
5972 | struct extent_buffer *leaf; | |
5973 | int ret; | |
5974 | ||
33345d01 | 5975 | key.objectid = btrfs_ino(inode); |
962a298f | 5976 | key.type = BTRFS_DIR_INDEX_KEY; |
aec7477b JB |
5977 | key.offset = (u64)-1; |
5978 | ||
5979 | path = btrfs_alloc_path(); | |
5980 | if (!path) | |
5981 | return -ENOMEM; | |
5982 | ||
5983 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); | |
5984 | if (ret < 0) | |
5985 | goto out; | |
5986 | /* FIXME: we should be able to handle this */ | |
5987 | if (ret == 0) | |
5988 | goto out; | |
5989 | ret = 0; | |
5990 | ||
5991 | /* | |
5992 | * MAGIC NUMBER EXPLANATION: | |
5993 | * since we search a directory based on f_pos we have to start at 2 | |
5994 | * since '.' and '..' have f_pos of 0 and 1 respectively, so everybody | |
5995 | * else has to start at 2 | |
5996 | */ | |
5997 | if (path->slots[0] == 0) { | |
5998 | BTRFS_I(inode)->index_cnt = 2; | |
5999 | goto out; | |
6000 | } | |
6001 | ||
6002 | path->slots[0]--; | |
6003 | ||
6004 | leaf = path->nodes[0]; | |
6005 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); | |
6006 | ||
33345d01 | 6007 | if (found_key.objectid != btrfs_ino(inode) || |
962a298f | 6008 | found_key.type != BTRFS_DIR_INDEX_KEY) { |
aec7477b JB |
6009 | BTRFS_I(inode)->index_cnt = 2; |
6010 | goto out; | |
6011 | } | |
6012 | ||
6013 | BTRFS_I(inode)->index_cnt = found_key.offset + 1; | |
6014 | out: | |
6015 | btrfs_free_path(path); | |
6016 | return ret; | |
6017 | } | |
6018 | ||
d352ac68 CM |
6019 | /* |
6020 | * helper to find a free sequence number in a given directory. This current | |
6021 | * code is very simple, later versions will do smarter things in the btree | |
6022 | */ | |
3de4586c | 6023 | int btrfs_set_inode_index(struct inode *dir, u64 *index) |
aec7477b JB |
6024 | { |
6025 | int ret = 0; | |
6026 | ||
6027 | if (BTRFS_I(dir)->index_cnt == (u64)-1) { | |
16cdcec7 MX |
6028 | ret = btrfs_inode_delayed_dir_index_count(dir); |
6029 | if (ret) { | |
6030 | ret = btrfs_set_inode_index_count(dir); | |
6031 | if (ret) | |
6032 | return ret; | |
6033 | } | |
aec7477b JB |
6034 | } |
6035 | ||
00e4e6b3 | 6036 | *index = BTRFS_I(dir)->index_cnt; |
aec7477b JB |
6037 | BTRFS_I(dir)->index_cnt++; |
6038 | ||
6039 | return ret; | |
6040 | } | |
6041 | ||
b0d5d10f CM |
6042 | static int btrfs_insert_inode_locked(struct inode *inode) |
6043 | { | |
6044 | struct btrfs_iget_args args; | |
6045 | args.location = &BTRFS_I(inode)->location; | |
6046 | args.root = BTRFS_I(inode)->root; | |
6047 | ||
6048 | return insert_inode_locked4(inode, | |
6049 | btrfs_inode_hash(inode->i_ino, BTRFS_I(inode)->root), | |
6050 | btrfs_find_actor, &args); | |
6051 | } | |
6052 | ||
39279cc3 CM |
6053 | static struct inode *btrfs_new_inode(struct btrfs_trans_handle *trans, |
6054 | struct btrfs_root *root, | |
aec7477b | 6055 | struct inode *dir, |
9c58309d | 6056 | const char *name, int name_len, |
175a4eb7 AV |
6057 | u64 ref_objectid, u64 objectid, |
6058 | umode_t mode, u64 *index) | |
39279cc3 CM |
6059 | { |
6060 | struct inode *inode; | |
5f39d397 | 6061 | struct btrfs_inode_item *inode_item; |
39279cc3 | 6062 | struct btrfs_key *location; |
5f39d397 | 6063 | struct btrfs_path *path; |
9c58309d CM |
6064 | struct btrfs_inode_ref *ref; |
6065 | struct btrfs_key key[2]; | |
6066 | u32 sizes[2]; | |
ef3b9af5 | 6067 | int nitems = name ? 2 : 1; |
9c58309d | 6068 | unsigned long ptr; |
39279cc3 | 6069 | int ret; |
39279cc3 | 6070 | |
5f39d397 | 6071 | path = btrfs_alloc_path(); |
d8926bb3 MF |
6072 | if (!path) |
6073 | return ERR_PTR(-ENOMEM); | |
5f39d397 | 6074 | |
39279cc3 | 6075 | inode = new_inode(root->fs_info->sb); |
8fb27640 YS |
6076 | if (!inode) { |
6077 | btrfs_free_path(path); | |
39279cc3 | 6078 | return ERR_PTR(-ENOMEM); |
8fb27640 | 6079 | } |
39279cc3 | 6080 | |
5762b5c9 FM |
6081 | /* |
6082 | * O_TMPFILE, set link count to 0, so that after this point, | |
6083 | * we fill in an inode item with the correct link count. | |
6084 | */ | |
6085 | if (!name) | |
6086 | set_nlink(inode, 0); | |
6087 | ||
581bb050 LZ |
6088 | /* |
6089 | * we have to initialize this early, so we can reclaim the inode | |
6090 | * number if we fail afterwards in this function. | |
6091 | */ | |
6092 | inode->i_ino = objectid; | |
6093 | ||
ef3b9af5 | 6094 | if (dir && name) { |
1abe9b8a | 6095 | trace_btrfs_inode_request(dir); |
6096 | ||
3de4586c | 6097 | ret = btrfs_set_inode_index(dir, index); |
09771430 | 6098 | if (ret) { |
8fb27640 | 6099 | btrfs_free_path(path); |
09771430 | 6100 | iput(inode); |
aec7477b | 6101 | return ERR_PTR(ret); |
09771430 | 6102 | } |
ef3b9af5 FM |
6103 | } else if (dir) { |
6104 | *index = 0; | |
aec7477b JB |
6105 | } |
6106 | /* | |
6107 | * index_cnt is ignored for everything but a dir, | |
6108 | * btrfs_get_inode_index_count has an explanation for the magic | |
6109 | * number | |
6110 | */ | |
6111 | BTRFS_I(inode)->index_cnt = 2; | |
67de1176 | 6112 | BTRFS_I(inode)->dir_index = *index; |
39279cc3 | 6113 | BTRFS_I(inode)->root = root; |
e02119d5 | 6114 | BTRFS_I(inode)->generation = trans->transid; |
76195853 | 6115 | inode->i_generation = BTRFS_I(inode)->generation; |
b888db2b | 6116 | |
5dc562c5 JB |
6117 | /* |
6118 | * We could have gotten an inode number from somebody who was fsynced | |
6119 | * and then removed in this same transaction, so let's just set full | |
6120 | * sync since it will be a full sync anyway and this will blow away the | |
6121 | * old info in the log. | |
6122 | */ | |
6123 | set_bit(BTRFS_INODE_NEEDS_FULL_SYNC, &BTRFS_I(inode)->runtime_flags); | |
6124 | ||
9c58309d | 6125 | key[0].objectid = objectid; |
962a298f | 6126 | key[0].type = BTRFS_INODE_ITEM_KEY; |
9c58309d CM |
6127 | key[0].offset = 0; |
6128 | ||
9c58309d | 6129 | sizes[0] = sizeof(struct btrfs_inode_item); |
ef3b9af5 FM |
6130 | |
6131 | if (name) { | |
6132 | /* | |
6133 | * Start new inodes with an inode_ref. This is slightly more | |
6134 | * efficient for small numbers of hard links since they will | |
6135 | * be packed into one item. Extended refs will kick in if we | |
6136 | * add more hard links than can fit in the ref item. | |
6137 | */ | |
6138 | key[1].objectid = objectid; | |
962a298f | 6139 | key[1].type = BTRFS_INODE_REF_KEY; |
ef3b9af5 FM |
6140 | key[1].offset = ref_objectid; |
6141 | ||
6142 | sizes[1] = name_len + sizeof(*ref); | |
6143 | } | |
9c58309d | 6144 | |
b0d5d10f CM |
6145 | location = &BTRFS_I(inode)->location; |
6146 | location->objectid = objectid; | |
6147 | location->offset = 0; | |
962a298f | 6148 | location->type = BTRFS_INODE_ITEM_KEY; |
b0d5d10f CM |
6149 | |
6150 | ret = btrfs_insert_inode_locked(inode); | |
6151 | if (ret < 0) | |
6152 | goto fail; | |
6153 | ||
b9473439 | 6154 | path->leave_spinning = 1; |
ef3b9af5 | 6155 | ret = btrfs_insert_empty_items(trans, root, path, key, sizes, nitems); |
9c58309d | 6156 | if (ret != 0) |
b0d5d10f | 6157 | goto fail_unlock; |
5f39d397 | 6158 | |
ecc11fab | 6159 | inode_init_owner(inode, dir, mode); |
a76a3cd4 | 6160 | inode_set_bytes(inode, 0); |
9cc97d64 | 6161 | |
6162 | inode->i_mtime = CURRENT_TIME; | |
6163 | inode->i_atime = inode->i_mtime; | |
6164 | inode->i_ctime = inode->i_mtime; | |
6165 | BTRFS_I(inode)->i_otime = inode->i_mtime; | |
6166 | ||
5f39d397 CM |
6167 | inode_item = btrfs_item_ptr(path->nodes[0], path->slots[0], |
6168 | struct btrfs_inode_item); | |
293f7e07 LZ |
6169 | memset_extent_buffer(path->nodes[0], 0, (unsigned long)inode_item, |
6170 | sizeof(*inode_item)); | |
e02119d5 | 6171 | fill_inode_item(trans, path->nodes[0], inode_item, inode); |
9c58309d | 6172 | |
ef3b9af5 FM |
6173 | if (name) { |
6174 | ref = btrfs_item_ptr(path->nodes[0], path->slots[0] + 1, | |
6175 | struct btrfs_inode_ref); | |
6176 | btrfs_set_inode_ref_name_len(path->nodes[0], ref, name_len); | |
6177 | btrfs_set_inode_ref_index(path->nodes[0], ref, *index); | |
6178 | ptr = (unsigned long)(ref + 1); | |
6179 | write_extent_buffer(path->nodes[0], name, ptr, name_len); | |
6180 | } | |
9c58309d | 6181 | |
5f39d397 CM |
6182 | btrfs_mark_buffer_dirty(path->nodes[0]); |
6183 | btrfs_free_path(path); | |
6184 | ||
6cbff00f CH |
6185 | btrfs_inherit_iflags(inode, dir); |
6186 | ||
569254b0 | 6187 | if (S_ISREG(mode)) { |
94272164 CM |
6188 | if (btrfs_test_opt(root, NODATASUM)) |
6189 | BTRFS_I(inode)->flags |= BTRFS_INODE_NODATASUM; | |
213490b3 | 6190 | if (btrfs_test_opt(root, NODATACOW)) |
f2bdf9a8 JB |
6191 | BTRFS_I(inode)->flags |= BTRFS_INODE_NODATACOW | |
6192 | BTRFS_INODE_NODATASUM; | |
94272164 CM |
6193 | } |
6194 | ||
5d4f98a2 | 6195 | inode_tree_add(inode); |
1abe9b8a | 6196 | |
6197 | trace_btrfs_inode_new(inode); | |
1973f0fa | 6198 | btrfs_set_inode_last_trans(trans, inode); |
1abe9b8a | 6199 | |
8ea05e3a AB |
6200 | btrfs_update_root_times(trans, root); |
6201 | ||
63541927 FDBM |
6202 | ret = btrfs_inode_inherit_props(trans, inode, dir); |
6203 | if (ret) | |
6204 | btrfs_err(root->fs_info, | |
6205 | "error inheriting props for ino %llu (root %llu): %d", | |
6206 | btrfs_ino(inode), root->root_key.objectid, ret); | |
6207 | ||
39279cc3 | 6208 | return inode; |
b0d5d10f CM |
6209 | |
6210 | fail_unlock: | |
6211 | unlock_new_inode(inode); | |
5f39d397 | 6212 | fail: |
ef3b9af5 | 6213 | if (dir && name) |
aec7477b | 6214 | BTRFS_I(dir)->index_cnt--; |
5f39d397 | 6215 | btrfs_free_path(path); |
09771430 | 6216 | iput(inode); |
5f39d397 | 6217 | return ERR_PTR(ret); |
39279cc3 CM |
6218 | } |
6219 | ||
6220 | static inline u8 btrfs_inode_type(struct inode *inode) | |
6221 | { | |
6222 | return btrfs_type_by_mode[(inode->i_mode & S_IFMT) >> S_SHIFT]; | |
6223 | } | |
6224 | ||
d352ac68 CM |
6225 | /* |
6226 | * utility function to add 'inode' into 'parent_inode' with | |
6227 | * a give name and a given sequence number. | |
6228 | * if 'add_backref' is true, also insert a backref from the | |
6229 | * inode to the parent directory. | |
6230 | */ | |
e02119d5 CM |
6231 | int btrfs_add_link(struct btrfs_trans_handle *trans, |
6232 | struct inode *parent_inode, struct inode *inode, | |
6233 | const char *name, int name_len, int add_backref, u64 index) | |
39279cc3 | 6234 | { |
4df27c4d | 6235 | int ret = 0; |
39279cc3 | 6236 | struct btrfs_key key; |
e02119d5 | 6237 | struct btrfs_root *root = BTRFS_I(parent_inode)->root; |
33345d01 LZ |
6238 | u64 ino = btrfs_ino(inode); |
6239 | u64 parent_ino = btrfs_ino(parent_inode); | |
5f39d397 | 6240 | |
33345d01 | 6241 | if (unlikely(ino == BTRFS_FIRST_FREE_OBJECTID)) { |
4df27c4d YZ |
6242 | memcpy(&key, &BTRFS_I(inode)->root->root_key, sizeof(key)); |
6243 | } else { | |
33345d01 | 6244 | key.objectid = ino; |
962a298f | 6245 | key.type = BTRFS_INODE_ITEM_KEY; |
4df27c4d YZ |
6246 | key.offset = 0; |
6247 | } | |
6248 | ||
33345d01 | 6249 | if (unlikely(ino == BTRFS_FIRST_FREE_OBJECTID)) { |
4df27c4d YZ |
6250 | ret = btrfs_add_root_ref(trans, root->fs_info->tree_root, |
6251 | key.objectid, root->root_key.objectid, | |
33345d01 | 6252 | parent_ino, index, name, name_len); |
4df27c4d | 6253 | } else if (add_backref) { |
33345d01 LZ |
6254 | ret = btrfs_insert_inode_ref(trans, root, name, name_len, ino, |
6255 | parent_ino, index); | |
4df27c4d | 6256 | } |
39279cc3 | 6257 | |
79787eaa JM |
6258 | /* Nothing to clean up yet */ |
6259 | if (ret) | |
6260 | return ret; | |
4df27c4d | 6261 | |
79787eaa JM |
6262 | ret = btrfs_insert_dir_item(trans, root, name, name_len, |
6263 | parent_inode, &key, | |
6264 | btrfs_inode_type(inode), index); | |
9c52057c | 6265 | if (ret == -EEXIST || ret == -EOVERFLOW) |
79787eaa JM |
6266 | goto fail_dir_item; |
6267 | else if (ret) { | |
6268 | btrfs_abort_transaction(trans, root, ret); | |
6269 | return ret; | |
39279cc3 | 6270 | } |
79787eaa JM |
6271 | |
6272 | btrfs_i_size_write(parent_inode, parent_inode->i_size + | |
6273 | name_len * 2); | |
0c4d2d95 | 6274 | inode_inc_iversion(parent_inode); |
79787eaa JM |
6275 | parent_inode->i_mtime = parent_inode->i_ctime = CURRENT_TIME; |
6276 | ret = btrfs_update_inode(trans, root, parent_inode); | |
6277 | if (ret) | |
6278 | btrfs_abort_transaction(trans, root, ret); | |
39279cc3 | 6279 | return ret; |
fe66a05a CM |
6280 | |
6281 | fail_dir_item: | |
6282 | if (unlikely(ino == BTRFS_FIRST_FREE_OBJECTID)) { | |
6283 | u64 local_index; | |
6284 | int err; | |
6285 | err = btrfs_del_root_ref(trans, root->fs_info->tree_root, | |
6286 | key.objectid, root->root_key.objectid, | |
6287 | parent_ino, &local_index, name, name_len); | |
6288 | ||
6289 | } else if (add_backref) { | |
6290 | u64 local_index; | |
6291 | int err; | |
6292 | ||
6293 | err = btrfs_del_inode_ref(trans, root, name, name_len, | |
6294 | ino, parent_ino, &local_index); | |
6295 | } | |
6296 | return ret; | |
39279cc3 CM |
6297 | } |
6298 | ||
6299 | static int btrfs_add_nondir(struct btrfs_trans_handle *trans, | |
a1b075d2 JB |
6300 | struct inode *dir, struct dentry *dentry, |
6301 | struct inode *inode, int backref, u64 index) | |
39279cc3 | 6302 | { |
a1b075d2 JB |
6303 | int err = btrfs_add_link(trans, dir, inode, |
6304 | dentry->d_name.name, dentry->d_name.len, | |
6305 | backref, index); | |
39279cc3 CM |
6306 | if (err > 0) |
6307 | err = -EEXIST; | |
6308 | return err; | |
6309 | } | |
6310 | ||
618e21d5 | 6311 | static int btrfs_mknod(struct inode *dir, struct dentry *dentry, |
1a67aafb | 6312 | umode_t mode, dev_t rdev) |
618e21d5 JB |
6313 | { |
6314 | struct btrfs_trans_handle *trans; | |
6315 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
1832a6d5 | 6316 | struct inode *inode = NULL; |
618e21d5 JB |
6317 | int err; |
6318 | int drop_inode = 0; | |
6319 | u64 objectid; | |
00e4e6b3 | 6320 | u64 index = 0; |
618e21d5 | 6321 | |
9ed74f2d JB |
6322 | /* |
6323 | * 2 for inode item and ref | |
6324 | * 2 for dir items | |
6325 | * 1 for xattr if selinux is on | |
6326 | */ | |
a22285a6 YZ |
6327 | trans = btrfs_start_transaction(root, 5); |
6328 | if (IS_ERR(trans)) | |
6329 | return PTR_ERR(trans); | |
1832a6d5 | 6330 | |
581bb050 LZ |
6331 | err = btrfs_find_free_ino(root, &objectid); |
6332 | if (err) | |
6333 | goto out_unlock; | |
6334 | ||
aec7477b | 6335 | inode = btrfs_new_inode(trans, root, dir, dentry->d_name.name, |
33345d01 | 6336 | dentry->d_name.len, btrfs_ino(dir), objectid, |
d82a6f1d | 6337 | mode, &index); |
7cf96da3 TI |
6338 | if (IS_ERR(inode)) { |
6339 | err = PTR_ERR(inode); | |
618e21d5 | 6340 | goto out_unlock; |
7cf96da3 | 6341 | } |
618e21d5 | 6342 | |
ad19db71 CS |
6343 | /* |
6344 | * If the active LSM wants to access the inode during | |
6345 | * d_instantiate it needs these. Smack checks to see | |
6346 | * if the filesystem supports xattrs by looking at the | |
6347 | * ops vector. | |
6348 | */ | |
ad19db71 | 6349 | inode->i_op = &btrfs_special_inode_operations; |
b0d5d10f CM |
6350 | init_special_inode(inode, inode->i_mode, rdev); |
6351 | ||
6352 | err = btrfs_init_inode_security(trans, inode, dir, &dentry->d_name); | |
618e21d5 | 6353 | if (err) |
b0d5d10f CM |
6354 | goto out_unlock_inode; |
6355 | ||
6356 | err = btrfs_add_nondir(trans, dir, dentry, inode, 0, index); | |
6357 | if (err) { | |
6358 | goto out_unlock_inode; | |
6359 | } else { | |
1b4ab1bb | 6360 | btrfs_update_inode(trans, root, inode); |
b0d5d10f | 6361 | unlock_new_inode(inode); |
08c422c2 | 6362 | d_instantiate(dentry, inode); |
618e21d5 | 6363 | } |
b0d5d10f | 6364 | |
618e21d5 | 6365 | out_unlock: |
7ad85bb7 | 6366 | btrfs_end_transaction(trans, root); |
c581afc8 | 6367 | btrfs_balance_delayed_items(root); |
b53d3f5d | 6368 | btrfs_btree_balance_dirty(root); |
618e21d5 JB |
6369 | if (drop_inode) { |
6370 | inode_dec_link_count(inode); | |
6371 | iput(inode); | |
6372 | } | |
618e21d5 | 6373 | return err; |
b0d5d10f CM |
6374 | |
6375 | out_unlock_inode: | |
6376 | drop_inode = 1; | |
6377 | unlock_new_inode(inode); | |
6378 | goto out_unlock; | |
6379 | ||
618e21d5 JB |
6380 | } |
6381 | ||
39279cc3 | 6382 | static int btrfs_create(struct inode *dir, struct dentry *dentry, |
ebfc3b49 | 6383 | umode_t mode, bool excl) |
39279cc3 CM |
6384 | { |
6385 | struct btrfs_trans_handle *trans; | |
6386 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
1832a6d5 | 6387 | struct inode *inode = NULL; |
43baa579 | 6388 | int drop_inode_on_err = 0; |
a22285a6 | 6389 | int err; |
39279cc3 | 6390 | u64 objectid; |
00e4e6b3 | 6391 | u64 index = 0; |
39279cc3 | 6392 | |
9ed74f2d JB |
6393 | /* |
6394 | * 2 for inode item and ref | |
6395 | * 2 for dir items | |
6396 | * 1 for xattr if selinux is on | |
6397 | */ | |
a22285a6 YZ |
6398 | trans = btrfs_start_transaction(root, 5); |
6399 | if (IS_ERR(trans)) | |
6400 | return PTR_ERR(trans); | |
9ed74f2d | 6401 | |
581bb050 LZ |
6402 | err = btrfs_find_free_ino(root, &objectid); |
6403 | if (err) | |
6404 | goto out_unlock; | |
6405 | ||
aec7477b | 6406 | inode = btrfs_new_inode(trans, root, dir, dentry->d_name.name, |
33345d01 | 6407 | dentry->d_name.len, btrfs_ino(dir), objectid, |
d82a6f1d | 6408 | mode, &index); |
7cf96da3 TI |
6409 | if (IS_ERR(inode)) { |
6410 | err = PTR_ERR(inode); | |
39279cc3 | 6411 | goto out_unlock; |
7cf96da3 | 6412 | } |
43baa579 | 6413 | drop_inode_on_err = 1; |
ad19db71 CS |
6414 | /* |
6415 | * If the active LSM wants to access the inode during | |
6416 | * d_instantiate it needs these. Smack checks to see | |
6417 | * if the filesystem supports xattrs by looking at the | |
6418 | * ops vector. | |
6419 | */ | |
6420 | inode->i_fop = &btrfs_file_operations; | |
6421 | inode->i_op = &btrfs_file_inode_operations; | |
b0d5d10f | 6422 | inode->i_mapping->a_ops = &btrfs_aops; |
b0d5d10f CM |
6423 | |
6424 | err = btrfs_init_inode_security(trans, inode, dir, &dentry->d_name); | |
6425 | if (err) | |
6426 | goto out_unlock_inode; | |
6427 | ||
6428 | err = btrfs_update_inode(trans, root, inode); | |
6429 | if (err) | |
6430 | goto out_unlock_inode; | |
ad19db71 | 6431 | |
a1b075d2 | 6432 | err = btrfs_add_nondir(trans, dir, dentry, inode, 0, index); |
39279cc3 | 6433 | if (err) |
b0d5d10f | 6434 | goto out_unlock_inode; |
43baa579 | 6435 | |
43baa579 | 6436 | BTRFS_I(inode)->io_tree.ops = &btrfs_extent_io_ops; |
b0d5d10f | 6437 | unlock_new_inode(inode); |
43baa579 FB |
6438 | d_instantiate(dentry, inode); |
6439 | ||
39279cc3 | 6440 | out_unlock: |
7ad85bb7 | 6441 | btrfs_end_transaction(trans, root); |
43baa579 | 6442 | if (err && drop_inode_on_err) { |
39279cc3 CM |
6443 | inode_dec_link_count(inode); |
6444 | iput(inode); | |
6445 | } | |
c581afc8 | 6446 | btrfs_balance_delayed_items(root); |
b53d3f5d | 6447 | btrfs_btree_balance_dirty(root); |
39279cc3 | 6448 | return err; |
b0d5d10f CM |
6449 | |
6450 | out_unlock_inode: | |
6451 | unlock_new_inode(inode); | |
6452 | goto out_unlock; | |
6453 | ||
39279cc3 CM |
6454 | } |
6455 | ||
6456 | static int btrfs_link(struct dentry *old_dentry, struct inode *dir, | |
6457 | struct dentry *dentry) | |
6458 | { | |
271dba45 | 6459 | struct btrfs_trans_handle *trans = NULL; |
39279cc3 | 6460 | struct btrfs_root *root = BTRFS_I(dir)->root; |
2b0143b5 | 6461 | struct inode *inode = d_inode(old_dentry); |
00e4e6b3 | 6462 | u64 index; |
39279cc3 CM |
6463 | int err; |
6464 | int drop_inode = 0; | |
6465 | ||
4a8be425 TH |
6466 | /* do not allow sys_link's with other subvols of the same device */ |
6467 | if (root->objectid != BTRFS_I(inode)->root->objectid) | |
3ab3564f | 6468 | return -EXDEV; |
4a8be425 | 6469 | |
f186373f | 6470 | if (inode->i_nlink >= BTRFS_LINK_MAX) |
c055e99e | 6471 | return -EMLINK; |
4a8be425 | 6472 | |
3de4586c | 6473 | err = btrfs_set_inode_index(dir, &index); |
aec7477b JB |
6474 | if (err) |
6475 | goto fail; | |
6476 | ||
a22285a6 | 6477 | /* |
7e6b6465 | 6478 | * 2 items for inode and inode ref |
a22285a6 | 6479 | * 2 items for dir items |
7e6b6465 | 6480 | * 1 item for parent inode |
a22285a6 | 6481 | */ |
7e6b6465 | 6482 | trans = btrfs_start_transaction(root, 5); |
a22285a6 YZ |
6483 | if (IS_ERR(trans)) { |
6484 | err = PTR_ERR(trans); | |
271dba45 | 6485 | trans = NULL; |
a22285a6 YZ |
6486 | goto fail; |
6487 | } | |
5f39d397 | 6488 | |
67de1176 MX |
6489 | /* There are several dir indexes for this inode, clear the cache. */ |
6490 | BTRFS_I(inode)->dir_index = 0ULL; | |
8b558c5f | 6491 | inc_nlink(inode); |
0c4d2d95 | 6492 | inode_inc_iversion(inode); |
3153495d | 6493 | inode->i_ctime = CURRENT_TIME; |
7de9c6ee | 6494 | ihold(inode); |
e9976151 | 6495 | set_bit(BTRFS_INODE_COPY_EVERYTHING, &BTRFS_I(inode)->runtime_flags); |
aec7477b | 6496 | |
a1b075d2 | 6497 | err = btrfs_add_nondir(trans, dir, dentry, inode, 1, index); |
5f39d397 | 6498 | |
a5719521 | 6499 | if (err) { |
54aa1f4d | 6500 | drop_inode = 1; |
a5719521 | 6501 | } else { |
10d9f309 | 6502 | struct dentry *parent = dentry->d_parent; |
a5719521 | 6503 | err = btrfs_update_inode(trans, root, inode); |
79787eaa JM |
6504 | if (err) |
6505 | goto fail; | |
ef3b9af5 FM |
6506 | if (inode->i_nlink == 1) { |
6507 | /* | |
6508 | * If new hard link count is 1, it's a file created | |
6509 | * with open(2) O_TMPFILE flag. | |
6510 | */ | |
6511 | err = btrfs_orphan_del(trans, inode); | |
6512 | if (err) | |
6513 | goto fail; | |
6514 | } | |
08c422c2 | 6515 | d_instantiate(dentry, inode); |
6a912213 | 6516 | btrfs_log_new_name(trans, inode, NULL, parent); |
a5719521 | 6517 | } |
39279cc3 | 6518 | |
c581afc8 | 6519 | btrfs_balance_delayed_items(root); |
1832a6d5 | 6520 | fail: |
271dba45 FM |
6521 | if (trans) |
6522 | btrfs_end_transaction(trans, root); | |
39279cc3 CM |
6523 | if (drop_inode) { |
6524 | inode_dec_link_count(inode); | |
6525 | iput(inode); | |
6526 | } | |
b53d3f5d | 6527 | btrfs_btree_balance_dirty(root); |
39279cc3 CM |
6528 | return err; |
6529 | } | |
6530 | ||
18bb1db3 | 6531 | static int btrfs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) |
39279cc3 | 6532 | { |
b9d86667 | 6533 | struct inode *inode = NULL; |
39279cc3 CM |
6534 | struct btrfs_trans_handle *trans; |
6535 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
6536 | int err = 0; | |
6537 | int drop_on_err = 0; | |
b9d86667 | 6538 | u64 objectid = 0; |
00e4e6b3 | 6539 | u64 index = 0; |
39279cc3 | 6540 | |
9ed74f2d JB |
6541 | /* |
6542 | * 2 items for inode and ref | |
6543 | * 2 items for dir items | |
6544 | * 1 for xattr if selinux is on | |
6545 | */ | |
a22285a6 YZ |
6546 | trans = btrfs_start_transaction(root, 5); |
6547 | if (IS_ERR(trans)) | |
6548 | return PTR_ERR(trans); | |
39279cc3 | 6549 | |
581bb050 LZ |
6550 | err = btrfs_find_free_ino(root, &objectid); |
6551 | if (err) | |
6552 | goto out_fail; | |
6553 | ||
aec7477b | 6554 | inode = btrfs_new_inode(trans, root, dir, dentry->d_name.name, |
33345d01 | 6555 | dentry->d_name.len, btrfs_ino(dir), objectid, |
d82a6f1d | 6556 | S_IFDIR | mode, &index); |
39279cc3 CM |
6557 | if (IS_ERR(inode)) { |
6558 | err = PTR_ERR(inode); | |
6559 | goto out_fail; | |
6560 | } | |
5f39d397 | 6561 | |
39279cc3 | 6562 | drop_on_err = 1; |
b0d5d10f CM |
6563 | /* these must be set before we unlock the inode */ |
6564 | inode->i_op = &btrfs_dir_inode_operations; | |
6565 | inode->i_fop = &btrfs_dir_file_operations; | |
33268eaf | 6566 | |
2a7dba39 | 6567 | err = btrfs_init_inode_security(trans, inode, dir, &dentry->d_name); |
33268eaf | 6568 | if (err) |
b0d5d10f | 6569 | goto out_fail_inode; |
39279cc3 | 6570 | |
dbe674a9 | 6571 | btrfs_i_size_write(inode, 0); |
39279cc3 CM |
6572 | err = btrfs_update_inode(trans, root, inode); |
6573 | if (err) | |
b0d5d10f | 6574 | goto out_fail_inode; |
5f39d397 | 6575 | |
a1b075d2 JB |
6576 | err = btrfs_add_link(trans, dir, inode, dentry->d_name.name, |
6577 | dentry->d_name.len, 0, index); | |
39279cc3 | 6578 | if (err) |
b0d5d10f | 6579 | goto out_fail_inode; |
5f39d397 | 6580 | |
39279cc3 | 6581 | d_instantiate(dentry, inode); |
b0d5d10f CM |
6582 | /* |
6583 | * mkdir is special. We're unlocking after we call d_instantiate | |
6584 | * to avoid a race with nfsd calling d_instantiate. | |
6585 | */ | |
6586 | unlock_new_inode(inode); | |
39279cc3 | 6587 | drop_on_err = 0; |
39279cc3 CM |
6588 | |
6589 | out_fail: | |
7ad85bb7 | 6590 | btrfs_end_transaction(trans, root); |
c7cfb8a5 WS |
6591 | if (drop_on_err) { |
6592 | inode_dec_link_count(inode); | |
39279cc3 | 6593 | iput(inode); |
c7cfb8a5 | 6594 | } |
c581afc8 | 6595 | btrfs_balance_delayed_items(root); |
b53d3f5d | 6596 | btrfs_btree_balance_dirty(root); |
39279cc3 | 6597 | return err; |
b0d5d10f CM |
6598 | |
6599 | out_fail_inode: | |
6600 | unlock_new_inode(inode); | |
6601 | goto out_fail; | |
39279cc3 CM |
6602 | } |
6603 | ||
e6c4efd8 QW |
6604 | /* Find next extent map of a given extent map, caller needs to ensure locks */ |
6605 | static struct extent_map *next_extent_map(struct extent_map *em) | |
6606 | { | |
6607 | struct rb_node *next; | |
6608 | ||
6609 | next = rb_next(&em->rb_node); | |
6610 | if (!next) | |
6611 | return NULL; | |
6612 | return container_of(next, struct extent_map, rb_node); | |
6613 | } | |
6614 | ||
6615 | static struct extent_map *prev_extent_map(struct extent_map *em) | |
6616 | { | |
6617 | struct rb_node *prev; | |
6618 | ||
6619 | prev = rb_prev(&em->rb_node); | |
6620 | if (!prev) | |
6621 | return NULL; | |
6622 | return container_of(prev, struct extent_map, rb_node); | |
6623 | } | |
6624 | ||
d352ac68 | 6625 | /* helper for btfs_get_extent. Given an existing extent in the tree, |
e6c4efd8 | 6626 | * the existing extent is the nearest extent to map_start, |
d352ac68 | 6627 | * and an extent that you want to insert, deal with overlap and insert |
e6c4efd8 | 6628 | * the best fitted new extent into the tree. |
d352ac68 | 6629 | */ |
3b951516 CM |
6630 | static int merge_extent_mapping(struct extent_map_tree *em_tree, |
6631 | struct extent_map *existing, | |
e6dcd2dc | 6632 | struct extent_map *em, |
51f395ad | 6633 | u64 map_start) |
3b951516 | 6634 | { |
e6c4efd8 QW |
6635 | struct extent_map *prev; |
6636 | struct extent_map *next; | |
6637 | u64 start; | |
6638 | u64 end; | |
3b951516 | 6639 | u64 start_diff; |
3b951516 | 6640 | |
e6dcd2dc | 6641 | BUG_ON(map_start < em->start || map_start >= extent_map_end(em)); |
e6c4efd8 QW |
6642 | |
6643 | if (existing->start > map_start) { | |
6644 | next = existing; | |
6645 | prev = prev_extent_map(next); | |
6646 | } else { | |
6647 | prev = existing; | |
6648 | next = next_extent_map(prev); | |
6649 | } | |
6650 | ||
6651 | start = prev ? extent_map_end(prev) : em->start; | |
6652 | start = max_t(u64, start, em->start); | |
6653 | end = next ? next->start : extent_map_end(em); | |
6654 | end = min_t(u64, end, extent_map_end(em)); | |
6655 | start_diff = start - em->start; | |
6656 | em->start = start; | |
6657 | em->len = end - start; | |
c8b97818 CM |
6658 | if (em->block_start < EXTENT_MAP_LAST_BYTE && |
6659 | !test_bit(EXTENT_FLAG_COMPRESSED, &em->flags)) { | |
e6dcd2dc | 6660 | em->block_start += start_diff; |
c8b97818 CM |
6661 | em->block_len -= start_diff; |
6662 | } | |
09a2a8f9 | 6663 | return add_extent_mapping(em_tree, em, 0); |
3b951516 CM |
6664 | } |
6665 | ||
c8b97818 | 6666 | static noinline int uncompress_inline(struct btrfs_path *path, |
e40da0e5 | 6667 | struct page *page, |
c8b97818 CM |
6668 | size_t pg_offset, u64 extent_offset, |
6669 | struct btrfs_file_extent_item *item) | |
6670 | { | |
6671 | int ret; | |
6672 | struct extent_buffer *leaf = path->nodes[0]; | |
6673 | char *tmp; | |
6674 | size_t max_size; | |
6675 | unsigned long inline_size; | |
6676 | unsigned long ptr; | |
261507a0 | 6677 | int compress_type; |
c8b97818 CM |
6678 | |
6679 | WARN_ON(pg_offset != 0); | |
261507a0 | 6680 | compress_type = btrfs_file_extent_compression(leaf, item); |
c8b97818 CM |
6681 | max_size = btrfs_file_extent_ram_bytes(leaf, item); |
6682 | inline_size = btrfs_file_extent_inline_item_len(leaf, | |
dd3cc16b | 6683 | btrfs_item_nr(path->slots[0])); |
c8b97818 | 6684 | tmp = kmalloc(inline_size, GFP_NOFS); |
8d413713 TI |
6685 | if (!tmp) |
6686 | return -ENOMEM; | |
c8b97818 CM |
6687 | ptr = btrfs_file_extent_inline_start(item); |
6688 | ||
6689 | read_extent_buffer(leaf, tmp, ptr, inline_size); | |
6690 | ||
5b050f04 | 6691 | max_size = min_t(unsigned long, PAGE_CACHE_SIZE, max_size); |
261507a0 LZ |
6692 | ret = btrfs_decompress(compress_type, tmp, page, |
6693 | extent_offset, inline_size, max_size); | |
c8b97818 | 6694 | kfree(tmp); |
166ae5a4 | 6695 | return ret; |
c8b97818 CM |
6696 | } |
6697 | ||
d352ac68 CM |
6698 | /* |
6699 | * a bit scary, this does extent mapping from logical file offset to the disk. | |
d397712b CM |
6700 | * the ugly parts come from merging extents from the disk with the in-ram |
6701 | * representation. This gets more complex because of the data=ordered code, | |
d352ac68 CM |
6702 | * where the in-ram extents might be locked pending data=ordered completion. |
6703 | * | |
6704 | * This also copies inline extents directly into the page. | |
6705 | */ | |
d397712b | 6706 | |
a52d9a80 | 6707 | struct extent_map *btrfs_get_extent(struct inode *inode, struct page *page, |
70dec807 | 6708 | size_t pg_offset, u64 start, u64 len, |
a52d9a80 CM |
6709 | int create) |
6710 | { | |
6711 | int ret; | |
6712 | int err = 0; | |
a52d9a80 CM |
6713 | u64 extent_start = 0; |
6714 | u64 extent_end = 0; | |
33345d01 | 6715 | u64 objectid = btrfs_ino(inode); |
a52d9a80 | 6716 | u32 found_type; |
f421950f | 6717 | struct btrfs_path *path = NULL; |
a52d9a80 CM |
6718 | struct btrfs_root *root = BTRFS_I(inode)->root; |
6719 | struct btrfs_file_extent_item *item; | |
5f39d397 CM |
6720 | struct extent_buffer *leaf; |
6721 | struct btrfs_key found_key; | |
a52d9a80 CM |
6722 | struct extent_map *em = NULL; |
6723 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; | |
d1310b2e | 6724 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; |
a52d9a80 | 6725 | struct btrfs_trans_handle *trans = NULL; |
7ffbb598 | 6726 | const bool new_inline = !page || create; |
a52d9a80 | 6727 | |
a52d9a80 | 6728 | again: |
890871be | 6729 | read_lock(&em_tree->lock); |
d1310b2e | 6730 | em = lookup_extent_mapping(em_tree, start, len); |
a061fc8d CM |
6731 | if (em) |
6732 | em->bdev = root->fs_info->fs_devices->latest_bdev; | |
890871be | 6733 | read_unlock(&em_tree->lock); |
d1310b2e | 6734 | |
a52d9a80 | 6735 | if (em) { |
e1c4b745 CM |
6736 | if (em->start > start || em->start + em->len <= start) |
6737 | free_extent_map(em); | |
6738 | else if (em->block_start == EXTENT_MAP_INLINE && page) | |
70dec807 CM |
6739 | free_extent_map(em); |
6740 | else | |
6741 | goto out; | |
a52d9a80 | 6742 | } |
172ddd60 | 6743 | em = alloc_extent_map(); |
a52d9a80 | 6744 | if (!em) { |
d1310b2e CM |
6745 | err = -ENOMEM; |
6746 | goto out; | |
a52d9a80 | 6747 | } |
e6dcd2dc | 6748 | em->bdev = root->fs_info->fs_devices->latest_bdev; |
d1310b2e | 6749 | em->start = EXTENT_MAP_HOLE; |
445a6944 | 6750 | em->orig_start = EXTENT_MAP_HOLE; |
d1310b2e | 6751 | em->len = (u64)-1; |
c8b97818 | 6752 | em->block_len = (u64)-1; |
f421950f CM |
6753 | |
6754 | if (!path) { | |
6755 | path = btrfs_alloc_path(); | |
026fd317 JB |
6756 | if (!path) { |
6757 | err = -ENOMEM; | |
6758 | goto out; | |
6759 | } | |
6760 | /* | |
6761 | * Chances are we'll be called again, so go ahead and do | |
6762 | * readahead | |
6763 | */ | |
e4058b54 | 6764 | path->reada = READA_FORWARD; |
f421950f CM |
6765 | } |
6766 | ||
179e29e4 CM |
6767 | ret = btrfs_lookup_file_extent(trans, root, path, |
6768 | objectid, start, trans != NULL); | |
a52d9a80 CM |
6769 | if (ret < 0) { |
6770 | err = ret; | |
6771 | goto out; | |
6772 | } | |
6773 | ||
6774 | if (ret != 0) { | |
6775 | if (path->slots[0] == 0) | |
6776 | goto not_found; | |
6777 | path->slots[0]--; | |
6778 | } | |
6779 | ||
5f39d397 CM |
6780 | leaf = path->nodes[0]; |
6781 | item = btrfs_item_ptr(leaf, path->slots[0], | |
a52d9a80 | 6782 | struct btrfs_file_extent_item); |
a52d9a80 | 6783 | /* are we inside the extent that was found? */ |
5f39d397 | 6784 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); |
962a298f | 6785 | found_type = found_key.type; |
5f39d397 | 6786 | if (found_key.objectid != objectid || |
a52d9a80 | 6787 | found_type != BTRFS_EXTENT_DATA_KEY) { |
25a50341 JB |
6788 | /* |
6789 | * If we backup past the first extent we want to move forward | |
6790 | * and see if there is an extent in front of us, otherwise we'll | |
6791 | * say there is a hole for our whole search range which can | |
6792 | * cause problems. | |
6793 | */ | |
6794 | extent_end = start; | |
6795 | goto next; | |
a52d9a80 CM |
6796 | } |
6797 | ||
5f39d397 CM |
6798 | found_type = btrfs_file_extent_type(leaf, item); |
6799 | extent_start = found_key.offset; | |
d899e052 YZ |
6800 | if (found_type == BTRFS_FILE_EXTENT_REG || |
6801 | found_type == BTRFS_FILE_EXTENT_PREALLOC) { | |
a52d9a80 | 6802 | extent_end = extent_start + |
db94535d | 6803 | btrfs_file_extent_num_bytes(leaf, item); |
9036c102 YZ |
6804 | } else if (found_type == BTRFS_FILE_EXTENT_INLINE) { |
6805 | size_t size; | |
514ac8ad | 6806 | size = btrfs_file_extent_inline_len(leaf, path->slots[0], item); |
fda2832f | 6807 | extent_end = ALIGN(extent_start + size, root->sectorsize); |
9036c102 | 6808 | } |
25a50341 | 6809 | next: |
9036c102 YZ |
6810 | if (start >= extent_end) { |
6811 | path->slots[0]++; | |
6812 | if (path->slots[0] >= btrfs_header_nritems(leaf)) { | |
6813 | ret = btrfs_next_leaf(root, path); | |
6814 | if (ret < 0) { | |
6815 | err = ret; | |
6816 | goto out; | |
a52d9a80 | 6817 | } |
9036c102 YZ |
6818 | if (ret > 0) |
6819 | goto not_found; | |
6820 | leaf = path->nodes[0]; | |
a52d9a80 | 6821 | } |
9036c102 YZ |
6822 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); |
6823 | if (found_key.objectid != objectid || | |
6824 | found_key.type != BTRFS_EXTENT_DATA_KEY) | |
6825 | goto not_found; | |
6826 | if (start + len <= found_key.offset) | |
6827 | goto not_found; | |
e2eca69d WS |
6828 | if (start > found_key.offset) |
6829 | goto next; | |
9036c102 | 6830 | em->start = start; |
70c8a91c | 6831 | em->orig_start = start; |
9036c102 YZ |
6832 | em->len = found_key.offset - start; |
6833 | goto not_found_em; | |
6834 | } | |
6835 | ||
7ffbb598 FM |
6836 | btrfs_extent_item_to_extent_map(inode, path, item, new_inline, em); |
6837 | ||
d899e052 YZ |
6838 | if (found_type == BTRFS_FILE_EXTENT_REG || |
6839 | found_type == BTRFS_FILE_EXTENT_PREALLOC) { | |
a52d9a80 CM |
6840 | goto insert; |
6841 | } else if (found_type == BTRFS_FILE_EXTENT_INLINE) { | |
5f39d397 | 6842 | unsigned long ptr; |
a52d9a80 | 6843 | char *map; |
3326d1b0 CM |
6844 | size_t size; |
6845 | size_t extent_offset; | |
6846 | size_t copy_size; | |
a52d9a80 | 6847 | |
7ffbb598 | 6848 | if (new_inline) |
689f9346 | 6849 | goto out; |
5f39d397 | 6850 | |
514ac8ad | 6851 | size = btrfs_file_extent_inline_len(leaf, path->slots[0], item); |
9036c102 | 6852 | extent_offset = page_offset(page) + pg_offset - extent_start; |
70dec807 | 6853 | copy_size = min_t(u64, PAGE_CACHE_SIZE - pg_offset, |
3326d1b0 | 6854 | size - extent_offset); |
3326d1b0 | 6855 | em->start = extent_start + extent_offset; |
fda2832f | 6856 | em->len = ALIGN(copy_size, root->sectorsize); |
b4939680 | 6857 | em->orig_block_len = em->len; |
70c8a91c | 6858 | em->orig_start = em->start; |
689f9346 | 6859 | ptr = btrfs_file_extent_inline_start(item) + extent_offset; |
179e29e4 | 6860 | if (create == 0 && !PageUptodate(page)) { |
261507a0 LZ |
6861 | if (btrfs_file_extent_compression(leaf, item) != |
6862 | BTRFS_COMPRESS_NONE) { | |
e40da0e5 | 6863 | ret = uncompress_inline(path, page, pg_offset, |
c8b97818 | 6864 | extent_offset, item); |
166ae5a4 ZB |
6865 | if (ret) { |
6866 | err = ret; | |
6867 | goto out; | |
6868 | } | |
c8b97818 CM |
6869 | } else { |
6870 | map = kmap(page); | |
6871 | read_extent_buffer(leaf, map + pg_offset, ptr, | |
6872 | copy_size); | |
93c82d57 CM |
6873 | if (pg_offset + copy_size < PAGE_CACHE_SIZE) { |
6874 | memset(map + pg_offset + copy_size, 0, | |
6875 | PAGE_CACHE_SIZE - pg_offset - | |
6876 | copy_size); | |
6877 | } | |
c8b97818 CM |
6878 | kunmap(page); |
6879 | } | |
179e29e4 CM |
6880 | flush_dcache_page(page); |
6881 | } else if (create && PageUptodate(page)) { | |
6bf7e080 | 6882 | BUG(); |
179e29e4 CM |
6883 | if (!trans) { |
6884 | kunmap(page); | |
6885 | free_extent_map(em); | |
6886 | em = NULL; | |
ff5714cc | 6887 | |
b3b4aa74 | 6888 | btrfs_release_path(path); |
7a7eaa40 | 6889 | trans = btrfs_join_transaction(root); |
ff5714cc | 6890 | |
3612b495 TI |
6891 | if (IS_ERR(trans)) |
6892 | return ERR_CAST(trans); | |
179e29e4 CM |
6893 | goto again; |
6894 | } | |
c8b97818 | 6895 | map = kmap(page); |
70dec807 | 6896 | write_extent_buffer(leaf, map + pg_offset, ptr, |
179e29e4 | 6897 | copy_size); |
c8b97818 | 6898 | kunmap(page); |
179e29e4 | 6899 | btrfs_mark_buffer_dirty(leaf); |
a52d9a80 | 6900 | } |
d1310b2e | 6901 | set_extent_uptodate(io_tree, em->start, |
507903b8 | 6902 | extent_map_end(em) - 1, NULL, GFP_NOFS); |
a52d9a80 | 6903 | goto insert; |
a52d9a80 CM |
6904 | } |
6905 | not_found: | |
6906 | em->start = start; | |
70c8a91c | 6907 | em->orig_start = start; |
d1310b2e | 6908 | em->len = len; |
a52d9a80 | 6909 | not_found_em: |
5f39d397 | 6910 | em->block_start = EXTENT_MAP_HOLE; |
9036c102 | 6911 | set_bit(EXTENT_FLAG_VACANCY, &em->flags); |
a52d9a80 | 6912 | insert: |
b3b4aa74 | 6913 | btrfs_release_path(path); |
d1310b2e | 6914 | if (em->start > start || extent_map_end(em) <= start) { |
c2cf52eb | 6915 | btrfs_err(root->fs_info, "bad extent! em: [%llu %llu] passed [%llu %llu]", |
c1c9ff7c | 6916 | em->start, em->len, start, len); |
a52d9a80 CM |
6917 | err = -EIO; |
6918 | goto out; | |
6919 | } | |
d1310b2e CM |
6920 | |
6921 | err = 0; | |
890871be | 6922 | write_lock(&em_tree->lock); |
09a2a8f9 | 6923 | ret = add_extent_mapping(em_tree, em, 0); |
3b951516 CM |
6924 | /* it is possible that someone inserted the extent into the tree |
6925 | * while we had the lock dropped. It is also possible that | |
6926 | * an overlapping map exists in the tree | |
6927 | */ | |
a52d9a80 | 6928 | if (ret == -EEXIST) { |
3b951516 | 6929 | struct extent_map *existing; |
e6dcd2dc CM |
6930 | |
6931 | ret = 0; | |
6932 | ||
e6c4efd8 QW |
6933 | existing = search_extent_mapping(em_tree, start, len); |
6934 | /* | |
6935 | * existing will always be non-NULL, since there must be | |
6936 | * extent causing the -EEXIST. | |
6937 | */ | |
6938 | if (start >= extent_map_end(existing) || | |
32be3a1a | 6939 | start <= existing->start) { |
e6c4efd8 QW |
6940 | /* |
6941 | * The existing extent map is the one nearest to | |
6942 | * the [start, start + len) range which overlaps | |
6943 | */ | |
6944 | err = merge_extent_mapping(em_tree, existing, | |
6945 | em, start); | |
e1c4b745 | 6946 | free_extent_map(existing); |
e6c4efd8 | 6947 | if (err) { |
3b951516 CM |
6948 | free_extent_map(em); |
6949 | em = NULL; | |
6950 | } | |
6951 | } else { | |
6952 | free_extent_map(em); | |
6953 | em = existing; | |
e6dcd2dc | 6954 | err = 0; |
a52d9a80 | 6955 | } |
a52d9a80 | 6956 | } |
890871be | 6957 | write_unlock(&em_tree->lock); |
a52d9a80 | 6958 | out: |
1abe9b8a | 6959 | |
4cd8587c | 6960 | trace_btrfs_get_extent(root, em); |
1abe9b8a | 6961 | |
527afb44 | 6962 | btrfs_free_path(path); |
a52d9a80 CM |
6963 | if (trans) { |
6964 | ret = btrfs_end_transaction(trans, root); | |
d397712b | 6965 | if (!err) |
a52d9a80 CM |
6966 | err = ret; |
6967 | } | |
a52d9a80 CM |
6968 | if (err) { |
6969 | free_extent_map(em); | |
a52d9a80 CM |
6970 | return ERR_PTR(err); |
6971 | } | |
79787eaa | 6972 | BUG_ON(!em); /* Error is always set */ |
a52d9a80 CM |
6973 | return em; |
6974 | } | |
6975 | ||
ec29ed5b CM |
6976 | struct extent_map *btrfs_get_extent_fiemap(struct inode *inode, struct page *page, |
6977 | size_t pg_offset, u64 start, u64 len, | |
6978 | int create) | |
6979 | { | |
6980 | struct extent_map *em; | |
6981 | struct extent_map *hole_em = NULL; | |
6982 | u64 range_start = start; | |
6983 | u64 end; | |
6984 | u64 found; | |
6985 | u64 found_end; | |
6986 | int err = 0; | |
6987 | ||
6988 | em = btrfs_get_extent(inode, page, pg_offset, start, len, create); | |
6989 | if (IS_ERR(em)) | |
6990 | return em; | |
6991 | if (em) { | |
6992 | /* | |
f9e4fb53 LB |
6993 | * if our em maps to |
6994 | * - a hole or | |
6995 | * - a pre-alloc extent, | |
6996 | * there might actually be delalloc bytes behind it. | |
ec29ed5b | 6997 | */ |
f9e4fb53 LB |
6998 | if (em->block_start != EXTENT_MAP_HOLE && |
6999 | !test_bit(EXTENT_FLAG_PREALLOC, &em->flags)) | |
ec29ed5b CM |
7000 | return em; |
7001 | else | |
7002 | hole_em = em; | |
7003 | } | |
7004 | ||
7005 | /* check to see if we've wrapped (len == -1 or similar) */ | |
7006 | end = start + len; | |
7007 | if (end < start) | |
7008 | end = (u64)-1; | |
7009 | else | |
7010 | end -= 1; | |
7011 | ||
7012 | em = NULL; | |
7013 | ||
7014 | /* ok, we didn't find anything, lets look for delalloc */ | |
7015 | found = count_range_bits(&BTRFS_I(inode)->io_tree, &range_start, | |
7016 | end, len, EXTENT_DELALLOC, 1); | |
7017 | found_end = range_start + found; | |
7018 | if (found_end < range_start) | |
7019 | found_end = (u64)-1; | |
7020 | ||
7021 | /* | |
7022 | * we didn't find anything useful, return | |
7023 | * the original results from get_extent() | |
7024 | */ | |
7025 | if (range_start > end || found_end <= start) { | |
7026 | em = hole_em; | |
7027 | hole_em = NULL; | |
7028 | goto out; | |
7029 | } | |
7030 | ||
7031 | /* adjust the range_start to make sure it doesn't | |
7032 | * go backwards from the start they passed in | |
7033 | */ | |
67871254 | 7034 | range_start = max(start, range_start); |
ec29ed5b CM |
7035 | found = found_end - range_start; |
7036 | ||
7037 | if (found > 0) { | |
7038 | u64 hole_start = start; | |
7039 | u64 hole_len = len; | |
7040 | ||
172ddd60 | 7041 | em = alloc_extent_map(); |
ec29ed5b CM |
7042 | if (!em) { |
7043 | err = -ENOMEM; | |
7044 | goto out; | |
7045 | } | |
7046 | /* | |
7047 | * when btrfs_get_extent can't find anything it | |
7048 | * returns one huge hole | |
7049 | * | |
7050 | * make sure what it found really fits our range, and | |
7051 | * adjust to make sure it is based on the start from | |
7052 | * the caller | |
7053 | */ | |
7054 | if (hole_em) { | |
7055 | u64 calc_end = extent_map_end(hole_em); | |
7056 | ||
7057 | if (calc_end <= start || (hole_em->start > end)) { | |
7058 | free_extent_map(hole_em); | |
7059 | hole_em = NULL; | |
7060 | } else { | |
7061 | hole_start = max(hole_em->start, start); | |
7062 | hole_len = calc_end - hole_start; | |
7063 | } | |
7064 | } | |
7065 | em->bdev = NULL; | |
7066 | if (hole_em && range_start > hole_start) { | |
7067 | /* our hole starts before our delalloc, so we | |
7068 | * have to return just the parts of the hole | |
7069 | * that go until the delalloc starts | |
7070 | */ | |
7071 | em->len = min(hole_len, | |
7072 | range_start - hole_start); | |
7073 | em->start = hole_start; | |
7074 | em->orig_start = hole_start; | |
7075 | /* | |
7076 | * don't adjust block start at all, | |
7077 | * it is fixed at EXTENT_MAP_HOLE | |
7078 | */ | |
7079 | em->block_start = hole_em->block_start; | |
7080 | em->block_len = hole_len; | |
f9e4fb53 LB |
7081 | if (test_bit(EXTENT_FLAG_PREALLOC, &hole_em->flags)) |
7082 | set_bit(EXTENT_FLAG_PREALLOC, &em->flags); | |
ec29ed5b CM |
7083 | } else { |
7084 | em->start = range_start; | |
7085 | em->len = found; | |
7086 | em->orig_start = range_start; | |
7087 | em->block_start = EXTENT_MAP_DELALLOC; | |
7088 | em->block_len = found; | |
7089 | } | |
7090 | } else if (hole_em) { | |
7091 | return hole_em; | |
7092 | } | |
7093 | out: | |
7094 | ||
7095 | free_extent_map(hole_em); | |
7096 | if (err) { | |
7097 | free_extent_map(em); | |
7098 | return ERR_PTR(err); | |
7099 | } | |
7100 | return em; | |
7101 | } | |
7102 | ||
4b46fce2 JB |
7103 | static struct extent_map *btrfs_new_extent_direct(struct inode *inode, |
7104 | u64 start, u64 len) | |
7105 | { | |
7106 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
70c8a91c | 7107 | struct extent_map *em; |
4b46fce2 JB |
7108 | struct btrfs_key ins; |
7109 | u64 alloc_hint; | |
7110 | int ret; | |
4b46fce2 | 7111 | |
4b46fce2 | 7112 | alloc_hint = get_extent_allocation_hint(inode, start, len); |
00361589 | 7113 | ret = btrfs_reserve_extent(root, len, root->sectorsize, 0, |
e570fd27 | 7114 | alloc_hint, &ins, 1, 1); |
00361589 JB |
7115 | if (ret) |
7116 | return ERR_PTR(ret); | |
4b46fce2 | 7117 | |
70c8a91c | 7118 | em = create_pinned_em(inode, start, ins.offset, start, ins.objectid, |
cc95bef6 | 7119 | ins.offset, ins.offset, ins.offset, 0); |
00361589 | 7120 | if (IS_ERR(em)) { |
e570fd27 | 7121 | btrfs_free_reserved_extent(root, ins.objectid, ins.offset, 1); |
00361589 JB |
7122 | return em; |
7123 | } | |
4b46fce2 JB |
7124 | |
7125 | ret = btrfs_add_ordered_extent_dio(inode, start, ins.objectid, | |
7126 | ins.offset, ins.offset, 0); | |
7127 | if (ret) { | |
e570fd27 | 7128 | btrfs_free_reserved_extent(root, ins.objectid, ins.offset, 1); |
00361589 JB |
7129 | free_extent_map(em); |
7130 | return ERR_PTR(ret); | |
4b46fce2 | 7131 | } |
00361589 | 7132 | |
4b46fce2 JB |
7133 | return em; |
7134 | } | |
7135 | ||
46bfbb5c CM |
7136 | /* |
7137 | * returns 1 when the nocow is safe, < 1 on error, 0 if the | |
7138 | * block must be cow'd | |
7139 | */ | |
00361589 | 7140 | noinline int can_nocow_extent(struct inode *inode, u64 offset, u64 *len, |
7ee9e440 JB |
7141 | u64 *orig_start, u64 *orig_block_len, |
7142 | u64 *ram_bytes) | |
46bfbb5c | 7143 | { |
00361589 | 7144 | struct btrfs_trans_handle *trans; |
46bfbb5c CM |
7145 | struct btrfs_path *path; |
7146 | int ret; | |
7147 | struct extent_buffer *leaf; | |
7148 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
7b2b7085 | 7149 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; |
46bfbb5c CM |
7150 | struct btrfs_file_extent_item *fi; |
7151 | struct btrfs_key key; | |
7152 | u64 disk_bytenr; | |
7153 | u64 backref_offset; | |
7154 | u64 extent_end; | |
7155 | u64 num_bytes; | |
7156 | int slot; | |
7157 | int found_type; | |
7ee9e440 | 7158 | bool nocow = (BTRFS_I(inode)->flags & BTRFS_INODE_NODATACOW); |
e77751aa | 7159 | |
46bfbb5c CM |
7160 | path = btrfs_alloc_path(); |
7161 | if (!path) | |
7162 | return -ENOMEM; | |
7163 | ||
00361589 | 7164 | ret = btrfs_lookup_file_extent(NULL, root, path, btrfs_ino(inode), |
46bfbb5c CM |
7165 | offset, 0); |
7166 | if (ret < 0) | |
7167 | goto out; | |
7168 | ||
7169 | slot = path->slots[0]; | |
7170 | if (ret == 1) { | |
7171 | if (slot == 0) { | |
7172 | /* can't find the item, must cow */ | |
7173 | ret = 0; | |
7174 | goto out; | |
7175 | } | |
7176 | slot--; | |
7177 | } | |
7178 | ret = 0; | |
7179 | leaf = path->nodes[0]; | |
7180 | btrfs_item_key_to_cpu(leaf, &key, slot); | |
33345d01 | 7181 | if (key.objectid != btrfs_ino(inode) || |
46bfbb5c CM |
7182 | key.type != BTRFS_EXTENT_DATA_KEY) { |
7183 | /* not our file or wrong item type, must cow */ | |
7184 | goto out; | |
7185 | } | |
7186 | ||
7187 | if (key.offset > offset) { | |
7188 | /* Wrong offset, must cow */ | |
7189 | goto out; | |
7190 | } | |
7191 | ||
7192 | fi = btrfs_item_ptr(leaf, slot, struct btrfs_file_extent_item); | |
7193 | found_type = btrfs_file_extent_type(leaf, fi); | |
7194 | if (found_type != BTRFS_FILE_EXTENT_REG && | |
7195 | found_type != BTRFS_FILE_EXTENT_PREALLOC) { | |
7196 | /* not a regular extent, must cow */ | |
7197 | goto out; | |
7198 | } | |
7ee9e440 JB |
7199 | |
7200 | if (!nocow && found_type == BTRFS_FILE_EXTENT_REG) | |
7201 | goto out; | |
7202 | ||
e77751aa MX |
7203 | extent_end = key.offset + btrfs_file_extent_num_bytes(leaf, fi); |
7204 | if (extent_end <= offset) | |
7205 | goto out; | |
7206 | ||
46bfbb5c | 7207 | disk_bytenr = btrfs_file_extent_disk_bytenr(leaf, fi); |
7ee9e440 JB |
7208 | if (disk_bytenr == 0) |
7209 | goto out; | |
7210 | ||
7211 | if (btrfs_file_extent_compression(leaf, fi) || | |
7212 | btrfs_file_extent_encryption(leaf, fi) || | |
7213 | btrfs_file_extent_other_encoding(leaf, fi)) | |
7214 | goto out; | |
7215 | ||
46bfbb5c CM |
7216 | backref_offset = btrfs_file_extent_offset(leaf, fi); |
7217 | ||
7ee9e440 JB |
7218 | if (orig_start) { |
7219 | *orig_start = key.offset - backref_offset; | |
7220 | *orig_block_len = btrfs_file_extent_disk_num_bytes(leaf, fi); | |
7221 | *ram_bytes = btrfs_file_extent_ram_bytes(leaf, fi); | |
7222 | } | |
eb384b55 | 7223 | |
46bfbb5c CM |
7224 | if (btrfs_extent_readonly(root, disk_bytenr)) |
7225 | goto out; | |
7b2b7085 MX |
7226 | |
7227 | num_bytes = min(offset + *len, extent_end) - offset; | |
7228 | if (!nocow && found_type == BTRFS_FILE_EXTENT_PREALLOC) { | |
7229 | u64 range_end; | |
7230 | ||
7231 | range_end = round_up(offset + num_bytes, root->sectorsize) - 1; | |
7232 | ret = test_range_bit(io_tree, offset, range_end, | |
7233 | EXTENT_DELALLOC, 0, NULL); | |
7234 | if (ret) { | |
7235 | ret = -EAGAIN; | |
7236 | goto out; | |
7237 | } | |
7238 | } | |
7239 | ||
1bda19eb | 7240 | btrfs_release_path(path); |
46bfbb5c CM |
7241 | |
7242 | /* | |
7243 | * look for other files referencing this extent, if we | |
7244 | * find any we must cow | |
7245 | */ | |
00361589 JB |
7246 | trans = btrfs_join_transaction(root); |
7247 | if (IS_ERR(trans)) { | |
7248 | ret = 0; | |
46bfbb5c | 7249 | goto out; |
00361589 JB |
7250 | } |
7251 | ||
7252 | ret = btrfs_cross_ref_exist(trans, root, btrfs_ino(inode), | |
7253 | key.offset - backref_offset, disk_bytenr); | |
7254 | btrfs_end_transaction(trans, root); | |
7255 | if (ret) { | |
7256 | ret = 0; | |
7257 | goto out; | |
7258 | } | |
46bfbb5c CM |
7259 | |
7260 | /* | |
7261 | * adjust disk_bytenr and num_bytes to cover just the bytes | |
7262 | * in this extent we are about to write. If there | |
7263 | * are any csums in that range we have to cow in order | |
7264 | * to keep the csums correct | |
7265 | */ | |
7266 | disk_bytenr += backref_offset; | |
7267 | disk_bytenr += offset - key.offset; | |
46bfbb5c CM |
7268 | if (csum_exist_in_range(root, disk_bytenr, num_bytes)) |
7269 | goto out; | |
7270 | /* | |
7271 | * all of the above have passed, it is safe to overwrite this extent | |
7272 | * without cow | |
7273 | */ | |
eb384b55 | 7274 | *len = num_bytes; |
46bfbb5c CM |
7275 | ret = 1; |
7276 | out: | |
7277 | btrfs_free_path(path); | |
7278 | return ret; | |
7279 | } | |
7280 | ||
fc4adbff AG |
7281 | bool btrfs_page_exists_in_range(struct inode *inode, loff_t start, loff_t end) |
7282 | { | |
7283 | struct radix_tree_root *root = &inode->i_mapping->page_tree; | |
7284 | int found = false; | |
7285 | void **pagep = NULL; | |
7286 | struct page *page = NULL; | |
7287 | int start_idx; | |
7288 | int end_idx; | |
7289 | ||
7290 | start_idx = start >> PAGE_CACHE_SHIFT; | |
7291 | ||
7292 | /* | |
7293 | * end is the last byte in the last page. end == start is legal | |
7294 | */ | |
7295 | end_idx = end >> PAGE_CACHE_SHIFT; | |
7296 | ||
7297 | rcu_read_lock(); | |
7298 | ||
7299 | /* Most of the code in this while loop is lifted from | |
7300 | * find_get_page. It's been modified to begin searching from a | |
7301 | * page and return just the first page found in that range. If the | |
7302 | * found idx is less than or equal to the end idx then we know that | |
7303 | * a page exists. If no pages are found or if those pages are | |
7304 | * outside of the range then we're fine (yay!) */ | |
7305 | while (page == NULL && | |
7306 | radix_tree_gang_lookup_slot(root, &pagep, NULL, start_idx, 1)) { | |
7307 | page = radix_tree_deref_slot(pagep); | |
7308 | if (unlikely(!page)) | |
7309 | break; | |
7310 | ||
7311 | if (radix_tree_exception(page)) { | |
809f9016 FM |
7312 | if (radix_tree_deref_retry(page)) { |
7313 | page = NULL; | |
fc4adbff | 7314 | continue; |
809f9016 | 7315 | } |
fc4adbff AG |
7316 | /* |
7317 | * Otherwise, shmem/tmpfs must be storing a swap entry | |
7318 | * here as an exceptional entry: so return it without | |
7319 | * attempting to raise page count. | |
7320 | */ | |
6fdef6d4 | 7321 | page = NULL; |
fc4adbff AG |
7322 | break; /* TODO: Is this relevant for this use case? */ |
7323 | } | |
7324 | ||
91405151 FM |
7325 | if (!page_cache_get_speculative(page)) { |
7326 | page = NULL; | |
fc4adbff | 7327 | continue; |
91405151 | 7328 | } |
fc4adbff AG |
7329 | |
7330 | /* | |
7331 | * Has the page moved? | |
7332 | * This is part of the lockless pagecache protocol. See | |
7333 | * include/linux/pagemap.h for details. | |
7334 | */ | |
7335 | if (unlikely(page != *pagep)) { | |
7336 | page_cache_release(page); | |
7337 | page = NULL; | |
7338 | } | |
7339 | } | |
7340 | ||
7341 | if (page) { | |
7342 | if (page->index <= end_idx) | |
7343 | found = true; | |
7344 | page_cache_release(page); | |
7345 | } | |
7346 | ||
7347 | rcu_read_unlock(); | |
7348 | return found; | |
7349 | } | |
7350 | ||
eb838e73 JB |
7351 | static int lock_extent_direct(struct inode *inode, u64 lockstart, u64 lockend, |
7352 | struct extent_state **cached_state, int writing) | |
7353 | { | |
7354 | struct btrfs_ordered_extent *ordered; | |
7355 | int ret = 0; | |
7356 | ||
7357 | while (1) { | |
7358 | lock_extent_bits(&BTRFS_I(inode)->io_tree, lockstart, lockend, | |
ff13db41 | 7359 | cached_state); |
eb838e73 JB |
7360 | /* |
7361 | * We're concerned with the entire range that we're going to be | |
7362 | * doing DIO to, so we need to make sure theres no ordered | |
7363 | * extents in this range. | |
7364 | */ | |
7365 | ordered = btrfs_lookup_ordered_range(inode, lockstart, | |
7366 | lockend - lockstart + 1); | |
7367 | ||
7368 | /* | |
7369 | * We need to make sure there are no buffered pages in this | |
7370 | * range either, we could have raced between the invalidate in | |
7371 | * generic_file_direct_write and locking the extent. The | |
7372 | * invalidate needs to happen so that reads after a write do not | |
7373 | * get stale data. | |
7374 | */ | |
fc4adbff AG |
7375 | if (!ordered && |
7376 | (!writing || | |
7377 | !btrfs_page_exists_in_range(inode, lockstart, lockend))) | |
eb838e73 JB |
7378 | break; |
7379 | ||
7380 | unlock_extent_cached(&BTRFS_I(inode)->io_tree, lockstart, lockend, | |
7381 | cached_state, GFP_NOFS); | |
7382 | ||
7383 | if (ordered) { | |
7384 | btrfs_start_ordered_extent(inode, ordered, 1); | |
7385 | btrfs_put_ordered_extent(ordered); | |
7386 | } else { | |
eb838e73 | 7387 | /* |
b850ae14 FM |
7388 | * We could trigger writeback for this range (and wait |
7389 | * for it to complete) and then invalidate the pages for | |
7390 | * this range (through invalidate_inode_pages2_range()), | |
7391 | * but that can lead us to a deadlock with a concurrent | |
7392 | * call to readpages() (a buffered read or a defrag call | |
7393 | * triggered a readahead) on a page lock due to an | |
7394 | * ordered dio extent we created before but did not have | |
7395 | * yet a corresponding bio submitted (whence it can not | |
7396 | * complete), which makes readpages() wait for that | |
7397 | * ordered extent to complete while holding a lock on | |
7398 | * that page. | |
eb838e73 | 7399 | */ |
b850ae14 FM |
7400 | ret = -ENOTBLK; |
7401 | break; | |
eb838e73 JB |
7402 | } |
7403 | ||
7404 | cond_resched(); | |
7405 | } | |
7406 | ||
7407 | return ret; | |
7408 | } | |
7409 | ||
69ffb543 JB |
7410 | static struct extent_map *create_pinned_em(struct inode *inode, u64 start, |
7411 | u64 len, u64 orig_start, | |
7412 | u64 block_start, u64 block_len, | |
cc95bef6 JB |
7413 | u64 orig_block_len, u64 ram_bytes, |
7414 | int type) | |
69ffb543 JB |
7415 | { |
7416 | struct extent_map_tree *em_tree; | |
7417 | struct extent_map *em; | |
7418 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
7419 | int ret; | |
7420 | ||
7421 | em_tree = &BTRFS_I(inode)->extent_tree; | |
7422 | em = alloc_extent_map(); | |
7423 | if (!em) | |
7424 | return ERR_PTR(-ENOMEM); | |
7425 | ||
7426 | em->start = start; | |
7427 | em->orig_start = orig_start; | |
2ab28f32 JB |
7428 | em->mod_start = start; |
7429 | em->mod_len = len; | |
69ffb543 JB |
7430 | em->len = len; |
7431 | em->block_len = block_len; | |
7432 | em->block_start = block_start; | |
7433 | em->bdev = root->fs_info->fs_devices->latest_bdev; | |
b4939680 | 7434 | em->orig_block_len = orig_block_len; |
cc95bef6 | 7435 | em->ram_bytes = ram_bytes; |
70c8a91c | 7436 | em->generation = -1; |
69ffb543 JB |
7437 | set_bit(EXTENT_FLAG_PINNED, &em->flags); |
7438 | if (type == BTRFS_ORDERED_PREALLOC) | |
b11e234d | 7439 | set_bit(EXTENT_FLAG_FILLING, &em->flags); |
69ffb543 JB |
7440 | |
7441 | do { | |
7442 | btrfs_drop_extent_cache(inode, em->start, | |
7443 | em->start + em->len - 1, 0); | |
7444 | write_lock(&em_tree->lock); | |
09a2a8f9 | 7445 | ret = add_extent_mapping(em_tree, em, 1); |
69ffb543 JB |
7446 | write_unlock(&em_tree->lock); |
7447 | } while (ret == -EEXIST); | |
7448 | ||
7449 | if (ret) { | |
7450 | free_extent_map(em); | |
7451 | return ERR_PTR(ret); | |
7452 | } | |
7453 | ||
7454 | return em; | |
7455 | } | |
7456 | ||
9c9464cc FM |
7457 | static void adjust_dio_outstanding_extents(struct inode *inode, |
7458 | struct btrfs_dio_data *dio_data, | |
7459 | const u64 len) | |
7460 | { | |
7461 | unsigned num_extents; | |
7462 | ||
7463 | num_extents = (unsigned) div64_u64(len + BTRFS_MAX_EXTENT_SIZE - 1, | |
7464 | BTRFS_MAX_EXTENT_SIZE); | |
7465 | /* | |
7466 | * If we have an outstanding_extents count still set then we're | |
7467 | * within our reservation, otherwise we need to adjust our inode | |
7468 | * counter appropriately. | |
7469 | */ | |
7470 | if (dio_data->outstanding_extents) { | |
7471 | dio_data->outstanding_extents -= num_extents; | |
7472 | } else { | |
7473 | spin_lock(&BTRFS_I(inode)->lock); | |
7474 | BTRFS_I(inode)->outstanding_extents += num_extents; | |
7475 | spin_unlock(&BTRFS_I(inode)->lock); | |
7476 | } | |
7477 | } | |
7478 | ||
4b46fce2 JB |
7479 | static int btrfs_get_blocks_direct(struct inode *inode, sector_t iblock, |
7480 | struct buffer_head *bh_result, int create) | |
7481 | { | |
7482 | struct extent_map *em; | |
7483 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
eb838e73 | 7484 | struct extent_state *cached_state = NULL; |
50745b0a | 7485 | struct btrfs_dio_data *dio_data = NULL; |
4b46fce2 | 7486 | u64 start = iblock << inode->i_blkbits; |
eb838e73 | 7487 | u64 lockstart, lockend; |
4b46fce2 | 7488 | u64 len = bh_result->b_size; |
eb838e73 | 7489 | int unlock_bits = EXTENT_LOCKED; |
0934856d | 7490 | int ret = 0; |
eb838e73 | 7491 | |
172a5049 | 7492 | if (create) |
3266789f | 7493 | unlock_bits |= EXTENT_DIRTY; |
172a5049 | 7494 | else |
c329861d | 7495 | len = min_t(u64, len, root->sectorsize); |
eb838e73 | 7496 | |
c329861d JB |
7497 | lockstart = start; |
7498 | lockend = start + len - 1; | |
7499 | ||
e1cbbfa5 JB |
7500 | if (current->journal_info) { |
7501 | /* | |
7502 | * Need to pull our outstanding extents and set journal_info to NULL so | |
7503 | * that anything that needs to check if there's a transction doesn't get | |
7504 | * confused. | |
7505 | */ | |
50745b0a | 7506 | dio_data = current->journal_info; |
e1cbbfa5 JB |
7507 | current->journal_info = NULL; |
7508 | } | |
7509 | ||
eb838e73 JB |
7510 | /* |
7511 | * If this errors out it's because we couldn't invalidate pagecache for | |
7512 | * this range and we need to fallback to buffered. | |
7513 | */ | |
9c9464cc FM |
7514 | if (lock_extent_direct(inode, lockstart, lockend, &cached_state, |
7515 | create)) { | |
7516 | ret = -ENOTBLK; | |
7517 | goto err; | |
7518 | } | |
eb838e73 | 7519 | |
4b46fce2 | 7520 | em = btrfs_get_extent(inode, NULL, 0, start, len, 0); |
eb838e73 JB |
7521 | if (IS_ERR(em)) { |
7522 | ret = PTR_ERR(em); | |
7523 | goto unlock_err; | |
7524 | } | |
4b46fce2 JB |
7525 | |
7526 | /* | |
7527 | * Ok for INLINE and COMPRESSED extents we need to fallback on buffered | |
7528 | * io. INLINE is special, and we could probably kludge it in here, but | |
7529 | * it's still buffered so for safety lets just fall back to the generic | |
7530 | * buffered path. | |
7531 | * | |
7532 | * For COMPRESSED we _have_ to read the entire extent in so we can | |
7533 | * decompress it, so there will be buffering required no matter what we | |
7534 | * do, so go ahead and fallback to buffered. | |
7535 | * | |
7536 | * We return -ENOTBLK because thats what makes DIO go ahead and go back | |
7537 | * to buffered IO. Don't blame me, this is the price we pay for using | |
7538 | * the generic code. | |
7539 | */ | |
7540 | if (test_bit(EXTENT_FLAG_COMPRESSED, &em->flags) || | |
7541 | em->block_start == EXTENT_MAP_INLINE) { | |
7542 | free_extent_map(em); | |
eb838e73 JB |
7543 | ret = -ENOTBLK; |
7544 | goto unlock_err; | |
4b46fce2 JB |
7545 | } |
7546 | ||
7547 | /* Just a good old fashioned hole, return */ | |
7548 | if (!create && (em->block_start == EXTENT_MAP_HOLE || | |
7549 | test_bit(EXTENT_FLAG_PREALLOC, &em->flags))) { | |
7550 | free_extent_map(em); | |
eb838e73 | 7551 | goto unlock_err; |
4b46fce2 JB |
7552 | } |
7553 | ||
7554 | /* | |
7555 | * We don't allocate a new extent in the following cases | |
7556 | * | |
7557 | * 1) The inode is marked as NODATACOW. In this case we'll just use the | |
7558 | * existing extent. | |
7559 | * 2) The extent is marked as PREALLOC. We're good to go here and can | |
7560 | * just use the extent. | |
7561 | * | |
7562 | */ | |
46bfbb5c | 7563 | if (!create) { |
eb838e73 JB |
7564 | len = min(len, em->len - (start - em->start)); |
7565 | lockstart = start + len; | |
7566 | goto unlock; | |
46bfbb5c | 7567 | } |
4b46fce2 JB |
7568 | |
7569 | if (test_bit(EXTENT_FLAG_PREALLOC, &em->flags) || | |
7570 | ((BTRFS_I(inode)->flags & BTRFS_INODE_NODATACOW) && | |
7571 | em->block_start != EXTENT_MAP_HOLE)) { | |
4b46fce2 | 7572 | int type; |
eb384b55 | 7573 | u64 block_start, orig_start, orig_block_len, ram_bytes; |
4b46fce2 JB |
7574 | |
7575 | if (test_bit(EXTENT_FLAG_PREALLOC, &em->flags)) | |
7576 | type = BTRFS_ORDERED_PREALLOC; | |
7577 | else | |
7578 | type = BTRFS_ORDERED_NOCOW; | |
46bfbb5c | 7579 | len = min(len, em->len - (start - em->start)); |
4b46fce2 | 7580 | block_start = em->block_start + (start - em->start); |
46bfbb5c | 7581 | |
00361589 | 7582 | if (can_nocow_extent(inode, start, &len, &orig_start, |
7ee9e440 | 7583 | &orig_block_len, &ram_bytes) == 1) { |
69ffb543 JB |
7584 | if (type == BTRFS_ORDERED_PREALLOC) { |
7585 | free_extent_map(em); | |
7586 | em = create_pinned_em(inode, start, len, | |
7587 | orig_start, | |
b4939680 | 7588 | block_start, len, |
cc95bef6 JB |
7589 | orig_block_len, |
7590 | ram_bytes, type); | |
555e1286 FM |
7591 | if (IS_ERR(em)) { |
7592 | ret = PTR_ERR(em); | |
69ffb543 | 7593 | goto unlock_err; |
555e1286 | 7594 | } |
69ffb543 JB |
7595 | } |
7596 | ||
46bfbb5c CM |
7597 | ret = btrfs_add_ordered_extent_dio(inode, start, |
7598 | block_start, len, len, type); | |
46bfbb5c CM |
7599 | if (ret) { |
7600 | free_extent_map(em); | |
eb838e73 | 7601 | goto unlock_err; |
46bfbb5c CM |
7602 | } |
7603 | goto unlock; | |
4b46fce2 | 7604 | } |
4b46fce2 | 7605 | } |
00361589 | 7606 | |
46bfbb5c CM |
7607 | /* |
7608 | * this will cow the extent, reset the len in case we changed | |
7609 | * it above | |
7610 | */ | |
7611 | len = bh_result->b_size; | |
70c8a91c JB |
7612 | free_extent_map(em); |
7613 | em = btrfs_new_extent_direct(inode, start, len); | |
eb838e73 JB |
7614 | if (IS_ERR(em)) { |
7615 | ret = PTR_ERR(em); | |
7616 | goto unlock_err; | |
7617 | } | |
46bfbb5c CM |
7618 | len = min(len, em->len - (start - em->start)); |
7619 | unlock: | |
4b46fce2 JB |
7620 | bh_result->b_blocknr = (em->block_start + (start - em->start)) >> |
7621 | inode->i_blkbits; | |
46bfbb5c | 7622 | bh_result->b_size = len; |
4b46fce2 JB |
7623 | bh_result->b_bdev = em->bdev; |
7624 | set_buffer_mapped(bh_result); | |
c3473e83 JB |
7625 | if (create) { |
7626 | if (!test_bit(EXTENT_FLAG_PREALLOC, &em->flags)) | |
7627 | set_buffer_new(bh_result); | |
7628 | ||
7629 | /* | |
7630 | * Need to update the i_size under the extent lock so buffered | |
7631 | * readers will get the updated i_size when we unlock. | |
7632 | */ | |
7633 | if (start + len > i_size_read(inode)) | |
7634 | i_size_write(inode, start + len); | |
0934856d | 7635 | |
9c9464cc | 7636 | adjust_dio_outstanding_extents(inode, dio_data, len); |
7cf5b976 | 7637 | btrfs_free_reserved_data_space(inode, start, len); |
50745b0a | 7638 | WARN_ON(dio_data->reserve < len); |
7639 | dio_data->reserve -= len; | |
f28a4928 | 7640 | dio_data->unsubmitted_oe_range_end = start + len; |
50745b0a | 7641 | current->journal_info = dio_data; |
c3473e83 | 7642 | } |
4b46fce2 | 7643 | |
eb838e73 JB |
7644 | /* |
7645 | * In the case of write we need to clear and unlock the entire range, | |
7646 | * in the case of read we need to unlock only the end area that we | |
7647 | * aren't using if there is any left over space. | |
7648 | */ | |
24c03fa5 | 7649 | if (lockstart < lockend) { |
0934856d MX |
7650 | clear_extent_bit(&BTRFS_I(inode)->io_tree, lockstart, |
7651 | lockend, unlock_bits, 1, 0, | |
7652 | &cached_state, GFP_NOFS); | |
24c03fa5 | 7653 | } else { |
eb838e73 | 7654 | free_extent_state(cached_state); |
24c03fa5 | 7655 | } |
eb838e73 | 7656 | |
4b46fce2 JB |
7657 | free_extent_map(em); |
7658 | ||
7659 | return 0; | |
eb838e73 JB |
7660 | |
7661 | unlock_err: | |
eb838e73 JB |
7662 | clear_extent_bit(&BTRFS_I(inode)->io_tree, lockstart, lockend, |
7663 | unlock_bits, 1, 0, &cached_state, GFP_NOFS); | |
9c9464cc | 7664 | err: |
50745b0a | 7665 | if (dio_data) |
7666 | current->journal_info = dio_data; | |
9c9464cc FM |
7667 | /* |
7668 | * Compensate the delalloc release we do in btrfs_direct_IO() when we | |
7669 | * write less data then expected, so that we don't underflow our inode's | |
7670 | * outstanding extents counter. | |
7671 | */ | |
7672 | if (create && dio_data) | |
7673 | adjust_dio_outstanding_extents(inode, dio_data, len); | |
7674 | ||
eb838e73 | 7675 | return ret; |
4b46fce2 JB |
7676 | } |
7677 | ||
8b110e39 MX |
7678 | static inline int submit_dio_repair_bio(struct inode *inode, struct bio *bio, |
7679 | int rw, int mirror_num) | |
7680 | { | |
7681 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
7682 | int ret; | |
7683 | ||
7684 | BUG_ON(rw & REQ_WRITE); | |
7685 | ||
7686 | bio_get(bio); | |
7687 | ||
7688 | ret = btrfs_bio_wq_end_io(root->fs_info, bio, | |
7689 | BTRFS_WQ_ENDIO_DIO_REPAIR); | |
7690 | if (ret) | |
7691 | goto err; | |
7692 | ||
7693 | ret = btrfs_map_bio(root, rw, bio, mirror_num, 0); | |
7694 | err: | |
7695 | bio_put(bio); | |
7696 | return ret; | |
7697 | } | |
7698 | ||
7699 | static int btrfs_check_dio_repairable(struct inode *inode, | |
7700 | struct bio *failed_bio, | |
7701 | struct io_failure_record *failrec, | |
7702 | int failed_mirror) | |
7703 | { | |
7704 | int num_copies; | |
7705 | ||
7706 | num_copies = btrfs_num_copies(BTRFS_I(inode)->root->fs_info, | |
7707 | failrec->logical, failrec->len); | |
7708 | if (num_copies == 1) { | |
7709 | /* | |
7710 | * we only have a single copy of the data, so don't bother with | |
7711 | * all the retry and error correction code that follows. no | |
7712 | * matter what the error is, it is very likely to persist. | |
7713 | */ | |
7714 | pr_debug("Check DIO Repairable: cannot repair, num_copies=%d, next_mirror %d, failed_mirror %d\n", | |
7715 | num_copies, failrec->this_mirror, failed_mirror); | |
7716 | return 0; | |
7717 | } | |
7718 | ||
7719 | failrec->failed_mirror = failed_mirror; | |
7720 | failrec->this_mirror++; | |
7721 | if (failrec->this_mirror == failed_mirror) | |
7722 | failrec->this_mirror++; | |
7723 | ||
7724 | if (failrec->this_mirror > num_copies) { | |
7725 | pr_debug("Check DIO Repairable: (fail) num_copies=%d, next_mirror %d, failed_mirror %d\n", | |
7726 | num_copies, failrec->this_mirror, failed_mirror); | |
7727 | return 0; | |
7728 | } | |
7729 | ||
7730 | return 1; | |
7731 | } | |
7732 | ||
7733 | static int dio_read_error(struct inode *inode, struct bio *failed_bio, | |
7734 | struct page *page, u64 start, u64 end, | |
7735 | int failed_mirror, bio_end_io_t *repair_endio, | |
7736 | void *repair_arg) | |
7737 | { | |
7738 | struct io_failure_record *failrec; | |
7739 | struct bio *bio; | |
7740 | int isector; | |
7741 | int read_mode; | |
7742 | int ret; | |
7743 | ||
7744 | BUG_ON(failed_bio->bi_rw & REQ_WRITE); | |
7745 | ||
7746 | ret = btrfs_get_io_failure_record(inode, start, end, &failrec); | |
7747 | if (ret) | |
7748 | return ret; | |
7749 | ||
7750 | ret = btrfs_check_dio_repairable(inode, failed_bio, failrec, | |
7751 | failed_mirror); | |
7752 | if (!ret) { | |
7753 | free_io_failure(inode, failrec); | |
7754 | return -EIO; | |
7755 | } | |
7756 | ||
7757 | if (failed_bio->bi_vcnt > 1) | |
7758 | read_mode = READ_SYNC | REQ_FAILFAST_DEV; | |
7759 | else | |
7760 | read_mode = READ_SYNC; | |
7761 | ||
7762 | isector = start - btrfs_io_bio(failed_bio)->logical; | |
7763 | isector >>= inode->i_sb->s_blocksize_bits; | |
7764 | bio = btrfs_create_repair_bio(inode, failed_bio, failrec, page, | |
7765 | 0, isector, repair_endio, repair_arg); | |
7766 | if (!bio) { | |
7767 | free_io_failure(inode, failrec); | |
7768 | return -EIO; | |
7769 | } | |
7770 | ||
7771 | btrfs_debug(BTRFS_I(inode)->root->fs_info, | |
7772 | "Repair DIO Read Error: submitting new dio read[%#x] to this_mirror=%d, in_validation=%d\n", | |
7773 | read_mode, failrec->this_mirror, failrec->in_validation); | |
7774 | ||
7775 | ret = submit_dio_repair_bio(inode, bio, read_mode, | |
7776 | failrec->this_mirror); | |
7777 | if (ret) { | |
7778 | free_io_failure(inode, failrec); | |
7779 | bio_put(bio); | |
7780 | } | |
7781 | ||
7782 | return ret; | |
7783 | } | |
7784 | ||
7785 | struct btrfs_retry_complete { | |
7786 | struct completion done; | |
7787 | struct inode *inode; | |
7788 | u64 start; | |
7789 | int uptodate; | |
7790 | }; | |
7791 | ||
4246a0b6 | 7792 | static void btrfs_retry_endio_nocsum(struct bio *bio) |
8b110e39 MX |
7793 | { |
7794 | struct btrfs_retry_complete *done = bio->bi_private; | |
7795 | struct bio_vec *bvec; | |
7796 | int i; | |
7797 | ||
4246a0b6 | 7798 | if (bio->bi_error) |
8b110e39 MX |
7799 | goto end; |
7800 | ||
7801 | done->uptodate = 1; | |
7802 | bio_for_each_segment_all(bvec, bio, i) | |
7803 | clean_io_failure(done->inode, done->start, bvec->bv_page, 0); | |
7804 | end: | |
7805 | complete(&done->done); | |
7806 | bio_put(bio); | |
7807 | } | |
7808 | ||
7809 | static int __btrfs_correct_data_nocsum(struct inode *inode, | |
7810 | struct btrfs_io_bio *io_bio) | |
4b46fce2 | 7811 | { |
2c30c71b | 7812 | struct bio_vec *bvec; |
8b110e39 | 7813 | struct btrfs_retry_complete done; |
4b46fce2 | 7814 | u64 start; |
2c30c71b | 7815 | int i; |
c1dc0896 | 7816 | int ret; |
4b46fce2 | 7817 | |
8b110e39 MX |
7818 | start = io_bio->logical; |
7819 | done.inode = inode; | |
7820 | ||
7821 | bio_for_each_segment_all(bvec, &io_bio->bio, i) { | |
7822 | try_again: | |
7823 | done.uptodate = 0; | |
7824 | done.start = start; | |
7825 | init_completion(&done.done); | |
7826 | ||
7827 | ret = dio_read_error(inode, &io_bio->bio, bvec->bv_page, start, | |
7828 | start + bvec->bv_len - 1, | |
7829 | io_bio->mirror_num, | |
7830 | btrfs_retry_endio_nocsum, &done); | |
7831 | if (ret) | |
7832 | return ret; | |
7833 | ||
7834 | wait_for_completion(&done.done); | |
7835 | ||
7836 | if (!done.uptodate) { | |
7837 | /* We might have another mirror, so try again */ | |
7838 | goto try_again; | |
7839 | } | |
7840 | ||
7841 | start += bvec->bv_len; | |
7842 | } | |
7843 | ||
7844 | return 0; | |
7845 | } | |
7846 | ||
4246a0b6 | 7847 | static void btrfs_retry_endio(struct bio *bio) |
8b110e39 MX |
7848 | { |
7849 | struct btrfs_retry_complete *done = bio->bi_private; | |
7850 | struct btrfs_io_bio *io_bio = btrfs_io_bio(bio); | |
7851 | struct bio_vec *bvec; | |
7852 | int uptodate; | |
7853 | int ret; | |
7854 | int i; | |
7855 | ||
4246a0b6 | 7856 | if (bio->bi_error) |
8b110e39 MX |
7857 | goto end; |
7858 | ||
7859 | uptodate = 1; | |
7860 | bio_for_each_segment_all(bvec, bio, i) { | |
7861 | ret = __readpage_endio_check(done->inode, io_bio, i, | |
7862 | bvec->bv_page, 0, | |
7863 | done->start, bvec->bv_len); | |
7864 | if (!ret) | |
7865 | clean_io_failure(done->inode, done->start, | |
7866 | bvec->bv_page, 0); | |
7867 | else | |
7868 | uptodate = 0; | |
7869 | } | |
7870 | ||
7871 | done->uptodate = uptodate; | |
7872 | end: | |
7873 | complete(&done->done); | |
7874 | bio_put(bio); | |
7875 | } | |
7876 | ||
7877 | static int __btrfs_subio_endio_read(struct inode *inode, | |
7878 | struct btrfs_io_bio *io_bio, int err) | |
7879 | { | |
7880 | struct bio_vec *bvec; | |
7881 | struct btrfs_retry_complete done; | |
7882 | u64 start; | |
7883 | u64 offset = 0; | |
7884 | int i; | |
7885 | int ret; | |
dc380aea | 7886 | |
8b110e39 | 7887 | err = 0; |
c1dc0896 | 7888 | start = io_bio->logical; |
8b110e39 MX |
7889 | done.inode = inode; |
7890 | ||
c1dc0896 | 7891 | bio_for_each_segment_all(bvec, &io_bio->bio, i) { |
dc380aea MX |
7892 | ret = __readpage_endio_check(inode, io_bio, i, bvec->bv_page, |
7893 | 0, start, bvec->bv_len); | |
8b110e39 MX |
7894 | if (likely(!ret)) |
7895 | goto next; | |
7896 | try_again: | |
7897 | done.uptodate = 0; | |
7898 | done.start = start; | |
7899 | init_completion(&done.done); | |
7900 | ||
7901 | ret = dio_read_error(inode, &io_bio->bio, bvec->bv_page, start, | |
7902 | start + bvec->bv_len - 1, | |
7903 | io_bio->mirror_num, | |
7904 | btrfs_retry_endio, &done); | |
7905 | if (ret) { | |
7906 | err = ret; | |
7907 | goto next; | |
7908 | } | |
7909 | ||
7910 | wait_for_completion(&done.done); | |
7911 | ||
7912 | if (!done.uptodate) { | |
7913 | /* We might have another mirror, so try again */ | |
7914 | goto try_again; | |
7915 | } | |
7916 | next: | |
7917 | offset += bvec->bv_len; | |
4b46fce2 | 7918 | start += bvec->bv_len; |
2c30c71b | 7919 | } |
c1dc0896 MX |
7920 | |
7921 | return err; | |
7922 | } | |
7923 | ||
8b110e39 MX |
7924 | static int btrfs_subio_endio_read(struct inode *inode, |
7925 | struct btrfs_io_bio *io_bio, int err) | |
7926 | { | |
7927 | bool skip_csum = BTRFS_I(inode)->flags & BTRFS_INODE_NODATASUM; | |
7928 | ||
7929 | if (skip_csum) { | |
7930 | if (unlikely(err)) | |
7931 | return __btrfs_correct_data_nocsum(inode, io_bio); | |
7932 | else | |
7933 | return 0; | |
7934 | } else { | |
7935 | return __btrfs_subio_endio_read(inode, io_bio, err); | |
7936 | } | |
7937 | } | |
7938 | ||
4246a0b6 | 7939 | static void btrfs_endio_direct_read(struct bio *bio) |
c1dc0896 MX |
7940 | { |
7941 | struct btrfs_dio_private *dip = bio->bi_private; | |
7942 | struct inode *inode = dip->inode; | |
7943 | struct bio *dio_bio; | |
7944 | struct btrfs_io_bio *io_bio = btrfs_io_bio(bio); | |
4246a0b6 | 7945 | int err = bio->bi_error; |
c1dc0896 | 7946 | |
8b110e39 MX |
7947 | if (dip->flags & BTRFS_DIO_ORIG_BIO_SUBMITTED) |
7948 | err = btrfs_subio_endio_read(inode, io_bio, err); | |
c1dc0896 | 7949 | |
4b46fce2 | 7950 | unlock_extent(&BTRFS_I(inode)->io_tree, dip->logical_offset, |
d0082371 | 7951 | dip->logical_offset + dip->bytes - 1); |
9be3395b | 7952 | dio_bio = dip->dio_bio; |
4b46fce2 | 7953 | |
4b46fce2 | 7954 | kfree(dip); |
c0da7aa1 | 7955 | |
4246a0b6 | 7956 | dio_end_io(dio_bio, bio->bi_error); |
23ea8e5a MX |
7957 | |
7958 | if (io_bio->end_io) | |
7959 | io_bio->end_io(io_bio, err); | |
9be3395b | 7960 | bio_put(bio); |
4b46fce2 JB |
7961 | } |
7962 | ||
14543774 FM |
7963 | static void btrfs_endio_direct_write_update_ordered(struct inode *inode, |
7964 | const u64 offset, | |
7965 | const u64 bytes, | |
7966 | const int uptodate) | |
4b46fce2 | 7967 | { |
4b46fce2 | 7968 | struct btrfs_root *root = BTRFS_I(inode)->root; |
4b46fce2 | 7969 | struct btrfs_ordered_extent *ordered = NULL; |
14543774 FM |
7970 | u64 ordered_offset = offset; |
7971 | u64 ordered_bytes = bytes; | |
4b46fce2 JB |
7972 | int ret; |
7973 | ||
163cf09c CM |
7974 | again: |
7975 | ret = btrfs_dec_test_first_ordered_pending(inode, &ordered, | |
7976 | &ordered_offset, | |
4246a0b6 | 7977 | ordered_bytes, |
14543774 | 7978 | uptodate); |
4b46fce2 | 7979 | if (!ret) |
163cf09c | 7980 | goto out_test; |
4b46fce2 | 7981 | |
9e0af237 LB |
7982 | btrfs_init_work(&ordered->work, btrfs_endio_write_helper, |
7983 | finish_ordered_fn, NULL, NULL); | |
fccb5d86 QW |
7984 | btrfs_queue_work(root->fs_info->endio_write_workers, |
7985 | &ordered->work); | |
163cf09c CM |
7986 | out_test: |
7987 | /* | |
7988 | * our bio might span multiple ordered extents. If we haven't | |
7989 | * completed the accounting for the whole dio, go back and try again | |
7990 | */ | |
14543774 FM |
7991 | if (ordered_offset < offset + bytes) { |
7992 | ordered_bytes = offset + bytes - ordered_offset; | |
5fd02043 | 7993 | ordered = NULL; |
163cf09c CM |
7994 | goto again; |
7995 | } | |
14543774 FM |
7996 | } |
7997 | ||
7998 | static void btrfs_endio_direct_write(struct bio *bio) | |
7999 | { | |
8000 | struct btrfs_dio_private *dip = bio->bi_private; | |
8001 | struct bio *dio_bio = dip->dio_bio; | |
8002 | ||
8003 | btrfs_endio_direct_write_update_ordered(dip->inode, | |
8004 | dip->logical_offset, | |
8005 | dip->bytes, | |
8006 | !bio->bi_error); | |
4b46fce2 | 8007 | |
4b46fce2 | 8008 | kfree(dip); |
c0da7aa1 | 8009 | |
4246a0b6 | 8010 | dio_end_io(dio_bio, bio->bi_error); |
9be3395b | 8011 | bio_put(bio); |
4b46fce2 JB |
8012 | } |
8013 | ||
eaf25d93 CM |
8014 | static int __btrfs_submit_bio_start_direct_io(struct inode *inode, int rw, |
8015 | struct bio *bio, int mirror_num, | |
8016 | unsigned long bio_flags, u64 offset) | |
8017 | { | |
8018 | int ret; | |
8019 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
8020 | ret = btrfs_csum_one_bio(root, inode, bio, offset, 1); | |
79787eaa | 8021 | BUG_ON(ret); /* -ENOMEM */ |
eaf25d93 CM |
8022 | return 0; |
8023 | } | |
8024 | ||
4246a0b6 | 8025 | static void btrfs_end_dio_bio(struct bio *bio) |
e65e1535 MX |
8026 | { |
8027 | struct btrfs_dio_private *dip = bio->bi_private; | |
4246a0b6 | 8028 | int err = bio->bi_error; |
e65e1535 | 8029 | |
8b110e39 MX |
8030 | if (err) |
8031 | btrfs_warn(BTRFS_I(dip->inode)->root->fs_info, | |
8032 | "direct IO failed ino %llu rw %lu sector %#Lx len %u err no %d", | |
8033 | btrfs_ino(dip->inode), bio->bi_rw, | |
8034 | (unsigned long long)bio->bi_iter.bi_sector, | |
8035 | bio->bi_iter.bi_size, err); | |
8036 | ||
8037 | if (dip->subio_endio) | |
8038 | err = dip->subio_endio(dip->inode, btrfs_io_bio(bio), err); | |
c1dc0896 MX |
8039 | |
8040 | if (err) { | |
e65e1535 MX |
8041 | dip->errors = 1; |
8042 | ||
8043 | /* | |
8044 | * before atomic variable goto zero, we must make sure | |
8045 | * dip->errors is perceived to be set. | |
8046 | */ | |
4e857c58 | 8047 | smp_mb__before_atomic(); |
e65e1535 MX |
8048 | } |
8049 | ||
8050 | /* if there are more bios still pending for this dio, just exit */ | |
8051 | if (!atomic_dec_and_test(&dip->pending_bios)) | |
8052 | goto out; | |
8053 | ||
9be3395b | 8054 | if (dip->errors) { |
e65e1535 | 8055 | bio_io_error(dip->orig_bio); |
9be3395b | 8056 | } else { |
4246a0b6 CH |
8057 | dip->dio_bio->bi_error = 0; |
8058 | bio_endio(dip->orig_bio); | |
e65e1535 MX |
8059 | } |
8060 | out: | |
8061 | bio_put(bio); | |
8062 | } | |
8063 | ||
8064 | static struct bio *btrfs_dio_bio_alloc(struct block_device *bdev, | |
8065 | u64 first_sector, gfp_t gfp_flags) | |
8066 | { | |
da2f0f74 | 8067 | struct bio *bio; |
22365979 | 8068 | bio = btrfs_bio_alloc(bdev, first_sector, BIO_MAX_PAGES, gfp_flags); |
da2f0f74 CM |
8069 | if (bio) |
8070 | bio_associate_current(bio); | |
8071 | return bio; | |
e65e1535 MX |
8072 | } |
8073 | ||
c1dc0896 MX |
8074 | static inline int btrfs_lookup_and_bind_dio_csum(struct btrfs_root *root, |
8075 | struct inode *inode, | |
8076 | struct btrfs_dio_private *dip, | |
8077 | struct bio *bio, | |
8078 | u64 file_offset) | |
8079 | { | |
8080 | struct btrfs_io_bio *io_bio = btrfs_io_bio(bio); | |
8081 | struct btrfs_io_bio *orig_io_bio = btrfs_io_bio(dip->orig_bio); | |
8082 | int ret; | |
8083 | ||
8084 | /* | |
8085 | * We load all the csum data we need when we submit | |
8086 | * the first bio to reduce the csum tree search and | |
8087 | * contention. | |
8088 | */ | |
8089 | if (dip->logical_offset == file_offset) { | |
8090 | ret = btrfs_lookup_bio_sums_dio(root, inode, dip->orig_bio, | |
8091 | file_offset); | |
8092 | if (ret) | |
8093 | return ret; | |
8094 | } | |
8095 | ||
8096 | if (bio == dip->orig_bio) | |
8097 | return 0; | |
8098 | ||
8099 | file_offset -= dip->logical_offset; | |
8100 | file_offset >>= inode->i_sb->s_blocksize_bits; | |
8101 | io_bio->csum = (u8 *)(((u32 *)orig_io_bio->csum) + file_offset); | |
8102 | ||
8103 | return 0; | |
8104 | } | |
8105 | ||
e65e1535 MX |
8106 | static inline int __btrfs_submit_dio_bio(struct bio *bio, struct inode *inode, |
8107 | int rw, u64 file_offset, int skip_sum, | |
c329861d | 8108 | int async_submit) |
e65e1535 | 8109 | { |
facc8a22 | 8110 | struct btrfs_dio_private *dip = bio->bi_private; |
e65e1535 MX |
8111 | int write = rw & REQ_WRITE; |
8112 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
8113 | int ret; | |
8114 | ||
b812ce28 JB |
8115 | if (async_submit) |
8116 | async_submit = !atomic_read(&BTRFS_I(inode)->sync_writers); | |
8117 | ||
e65e1535 | 8118 | bio_get(bio); |
5fd02043 JB |
8119 | |
8120 | if (!write) { | |
bfebd8b5 DS |
8121 | ret = btrfs_bio_wq_end_io(root->fs_info, bio, |
8122 | BTRFS_WQ_ENDIO_DATA); | |
5fd02043 JB |
8123 | if (ret) |
8124 | goto err; | |
8125 | } | |
e65e1535 | 8126 | |
1ae39938 JB |
8127 | if (skip_sum) |
8128 | goto map; | |
8129 | ||
8130 | if (write && async_submit) { | |
e65e1535 MX |
8131 | ret = btrfs_wq_submit_bio(root->fs_info, |
8132 | inode, rw, bio, 0, 0, | |
8133 | file_offset, | |
8134 | __btrfs_submit_bio_start_direct_io, | |
8135 | __btrfs_submit_bio_done); | |
8136 | goto err; | |
1ae39938 JB |
8137 | } else if (write) { |
8138 | /* | |
8139 | * If we aren't doing async submit, calculate the csum of the | |
8140 | * bio now. | |
8141 | */ | |
8142 | ret = btrfs_csum_one_bio(root, inode, bio, file_offset, 1); | |
8143 | if (ret) | |
8144 | goto err; | |
23ea8e5a | 8145 | } else { |
c1dc0896 MX |
8146 | ret = btrfs_lookup_and_bind_dio_csum(root, inode, dip, bio, |
8147 | file_offset); | |
c2db1073 TI |
8148 | if (ret) |
8149 | goto err; | |
8150 | } | |
1ae39938 JB |
8151 | map: |
8152 | ret = btrfs_map_bio(root, rw, bio, 0, async_submit); | |
e65e1535 MX |
8153 | err: |
8154 | bio_put(bio); | |
8155 | return ret; | |
8156 | } | |
8157 | ||
8158 | static int btrfs_submit_direct_hook(int rw, struct btrfs_dio_private *dip, | |
8159 | int skip_sum) | |
8160 | { | |
8161 | struct inode *inode = dip->inode; | |
8162 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
e65e1535 MX |
8163 | struct bio *bio; |
8164 | struct bio *orig_bio = dip->orig_bio; | |
8165 | struct bio_vec *bvec = orig_bio->bi_io_vec; | |
4f024f37 | 8166 | u64 start_sector = orig_bio->bi_iter.bi_sector; |
e65e1535 MX |
8167 | u64 file_offset = dip->logical_offset; |
8168 | u64 submit_len = 0; | |
8169 | u64 map_length; | |
8170 | int nr_pages = 0; | |
23ea8e5a | 8171 | int ret; |
1ae39938 | 8172 | int async_submit = 0; |
e65e1535 | 8173 | |
4f024f37 | 8174 | map_length = orig_bio->bi_iter.bi_size; |
53b381b3 | 8175 | ret = btrfs_map_block(root->fs_info, rw, start_sector << 9, |
e65e1535 | 8176 | &map_length, NULL, 0); |
7a5c3c9b | 8177 | if (ret) |
e65e1535 | 8178 | return -EIO; |
facc8a22 | 8179 | |
4f024f37 | 8180 | if (map_length >= orig_bio->bi_iter.bi_size) { |
02f57c7a | 8181 | bio = orig_bio; |
c1dc0896 | 8182 | dip->flags |= BTRFS_DIO_ORIG_BIO_SUBMITTED; |
02f57c7a JB |
8183 | goto submit; |
8184 | } | |
8185 | ||
53b381b3 | 8186 | /* async crcs make it difficult to collect full stripe writes. */ |
ffe2d203 | 8187 | if (btrfs_get_alloc_profile(root, 1) & BTRFS_BLOCK_GROUP_RAID56_MASK) |
53b381b3 DW |
8188 | async_submit = 0; |
8189 | else | |
8190 | async_submit = 1; | |
8191 | ||
02f57c7a JB |
8192 | bio = btrfs_dio_bio_alloc(orig_bio->bi_bdev, start_sector, GFP_NOFS); |
8193 | if (!bio) | |
8194 | return -ENOMEM; | |
7a5c3c9b | 8195 | |
02f57c7a JB |
8196 | bio->bi_private = dip; |
8197 | bio->bi_end_io = btrfs_end_dio_bio; | |
c1dc0896 | 8198 | btrfs_io_bio(bio)->logical = file_offset; |
02f57c7a JB |
8199 | atomic_inc(&dip->pending_bios); |
8200 | ||
e65e1535 | 8201 | while (bvec <= (orig_bio->bi_io_vec + orig_bio->bi_vcnt - 1)) { |
ee39b432 | 8202 | if (map_length < submit_len + bvec->bv_len || |
e65e1535 | 8203 | bio_add_page(bio, bvec->bv_page, bvec->bv_len, |
ee39b432 | 8204 | bvec->bv_offset) < bvec->bv_len) { |
e65e1535 MX |
8205 | /* |
8206 | * inc the count before we submit the bio so | |
8207 | * we know the end IO handler won't happen before | |
8208 | * we inc the count. Otherwise, the dip might get freed | |
8209 | * before we're done setting it up | |
8210 | */ | |
8211 | atomic_inc(&dip->pending_bios); | |
8212 | ret = __btrfs_submit_dio_bio(bio, inode, rw, | |
8213 | file_offset, skip_sum, | |
c329861d | 8214 | async_submit); |
e65e1535 MX |
8215 | if (ret) { |
8216 | bio_put(bio); | |
8217 | atomic_dec(&dip->pending_bios); | |
8218 | goto out_err; | |
8219 | } | |
8220 | ||
e65e1535 MX |
8221 | start_sector += submit_len >> 9; |
8222 | file_offset += submit_len; | |
8223 | ||
8224 | submit_len = 0; | |
8225 | nr_pages = 0; | |
8226 | ||
8227 | bio = btrfs_dio_bio_alloc(orig_bio->bi_bdev, | |
8228 | start_sector, GFP_NOFS); | |
8229 | if (!bio) | |
8230 | goto out_err; | |
8231 | bio->bi_private = dip; | |
8232 | bio->bi_end_io = btrfs_end_dio_bio; | |
c1dc0896 | 8233 | btrfs_io_bio(bio)->logical = file_offset; |
e65e1535 | 8234 | |
4f024f37 | 8235 | map_length = orig_bio->bi_iter.bi_size; |
53b381b3 | 8236 | ret = btrfs_map_block(root->fs_info, rw, |
3ec706c8 | 8237 | start_sector << 9, |
e65e1535 MX |
8238 | &map_length, NULL, 0); |
8239 | if (ret) { | |
8240 | bio_put(bio); | |
8241 | goto out_err; | |
8242 | } | |
8243 | } else { | |
8244 | submit_len += bvec->bv_len; | |
67871254 | 8245 | nr_pages++; |
e65e1535 MX |
8246 | bvec++; |
8247 | } | |
8248 | } | |
8249 | ||
02f57c7a | 8250 | submit: |
e65e1535 | 8251 | ret = __btrfs_submit_dio_bio(bio, inode, rw, file_offset, skip_sum, |
c329861d | 8252 | async_submit); |
e65e1535 MX |
8253 | if (!ret) |
8254 | return 0; | |
8255 | ||
8256 | bio_put(bio); | |
8257 | out_err: | |
8258 | dip->errors = 1; | |
8259 | /* | |
8260 | * before atomic variable goto zero, we must | |
8261 | * make sure dip->errors is perceived to be set. | |
8262 | */ | |
4e857c58 | 8263 | smp_mb__before_atomic(); |
e65e1535 MX |
8264 | if (atomic_dec_and_test(&dip->pending_bios)) |
8265 | bio_io_error(dip->orig_bio); | |
8266 | ||
8267 | /* bio_end_io() will handle error, so we needn't return it */ | |
8268 | return 0; | |
8269 | } | |
8270 | ||
9be3395b CM |
8271 | static void btrfs_submit_direct(int rw, struct bio *dio_bio, |
8272 | struct inode *inode, loff_t file_offset) | |
4b46fce2 | 8273 | { |
61de718f FM |
8274 | struct btrfs_dio_private *dip = NULL; |
8275 | struct bio *io_bio = NULL; | |
23ea8e5a | 8276 | struct btrfs_io_bio *btrfs_bio; |
4b46fce2 | 8277 | int skip_sum; |
7b6d91da | 8278 | int write = rw & REQ_WRITE; |
4b46fce2 JB |
8279 | int ret = 0; |
8280 | ||
8281 | skip_sum = BTRFS_I(inode)->flags & BTRFS_INODE_NODATASUM; | |
8282 | ||
9be3395b | 8283 | io_bio = btrfs_bio_clone(dio_bio, GFP_NOFS); |
9be3395b CM |
8284 | if (!io_bio) { |
8285 | ret = -ENOMEM; | |
8286 | goto free_ordered; | |
8287 | } | |
8288 | ||
c1dc0896 | 8289 | dip = kzalloc(sizeof(*dip), GFP_NOFS); |
4b46fce2 JB |
8290 | if (!dip) { |
8291 | ret = -ENOMEM; | |
61de718f | 8292 | goto free_ordered; |
4b46fce2 | 8293 | } |
4b46fce2 | 8294 | |
9be3395b | 8295 | dip->private = dio_bio->bi_private; |
4b46fce2 JB |
8296 | dip->inode = inode; |
8297 | dip->logical_offset = file_offset; | |
4f024f37 KO |
8298 | dip->bytes = dio_bio->bi_iter.bi_size; |
8299 | dip->disk_bytenr = (u64)dio_bio->bi_iter.bi_sector << 9; | |
9be3395b | 8300 | io_bio->bi_private = dip; |
9be3395b CM |
8301 | dip->orig_bio = io_bio; |
8302 | dip->dio_bio = dio_bio; | |
e65e1535 | 8303 | atomic_set(&dip->pending_bios, 0); |
c1dc0896 MX |
8304 | btrfs_bio = btrfs_io_bio(io_bio); |
8305 | btrfs_bio->logical = file_offset; | |
4b46fce2 | 8306 | |
c1dc0896 | 8307 | if (write) { |
9be3395b | 8308 | io_bio->bi_end_io = btrfs_endio_direct_write; |
c1dc0896 | 8309 | } else { |
9be3395b | 8310 | io_bio->bi_end_io = btrfs_endio_direct_read; |
c1dc0896 MX |
8311 | dip->subio_endio = btrfs_subio_endio_read; |
8312 | } | |
4b46fce2 | 8313 | |
f28a4928 FM |
8314 | /* |
8315 | * Reset the range for unsubmitted ordered extents (to a 0 length range) | |
8316 | * even if we fail to submit a bio, because in such case we do the | |
8317 | * corresponding error handling below and it must not be done a second | |
8318 | * time by btrfs_direct_IO(). | |
8319 | */ | |
8320 | if (write) { | |
8321 | struct btrfs_dio_data *dio_data = current->journal_info; | |
8322 | ||
8323 | dio_data->unsubmitted_oe_range_end = dip->logical_offset + | |
8324 | dip->bytes; | |
8325 | dio_data->unsubmitted_oe_range_start = | |
8326 | dio_data->unsubmitted_oe_range_end; | |
8327 | } | |
8328 | ||
e65e1535 MX |
8329 | ret = btrfs_submit_direct_hook(rw, dip, skip_sum); |
8330 | if (!ret) | |
eaf25d93 | 8331 | return; |
9be3395b | 8332 | |
23ea8e5a MX |
8333 | if (btrfs_bio->end_io) |
8334 | btrfs_bio->end_io(btrfs_bio, ret); | |
9be3395b | 8335 | |
4b46fce2 JB |
8336 | free_ordered: |
8337 | /* | |
61de718f FM |
8338 | * If we arrived here it means either we failed to submit the dip |
8339 | * or we either failed to clone the dio_bio or failed to allocate the | |
8340 | * dip. If we cloned the dio_bio and allocated the dip, we can just | |
8341 | * call bio_endio against our io_bio so that we get proper resource | |
8342 | * cleanup if we fail to submit the dip, otherwise, we must do the | |
8343 | * same as btrfs_endio_direct_[write|read] because we can't call these | |
8344 | * callbacks - they require an allocated dip and a clone of dio_bio. | |
4b46fce2 | 8345 | */ |
61de718f | 8346 | if (io_bio && dip) { |
4246a0b6 CH |
8347 | io_bio->bi_error = -EIO; |
8348 | bio_endio(io_bio); | |
61de718f FM |
8349 | /* |
8350 | * The end io callbacks free our dip, do the final put on io_bio | |
8351 | * and all the cleanup and final put for dio_bio (through | |
8352 | * dio_end_io()). | |
8353 | */ | |
8354 | dip = NULL; | |
8355 | io_bio = NULL; | |
8356 | } else { | |
14543774 FM |
8357 | if (write) |
8358 | btrfs_endio_direct_write_update_ordered(inode, | |
8359 | file_offset, | |
8360 | dio_bio->bi_iter.bi_size, | |
8361 | 0); | |
8362 | else | |
61de718f FM |
8363 | unlock_extent(&BTRFS_I(inode)->io_tree, file_offset, |
8364 | file_offset + dio_bio->bi_iter.bi_size - 1); | |
14543774 | 8365 | |
4246a0b6 | 8366 | dio_bio->bi_error = -EIO; |
61de718f FM |
8367 | /* |
8368 | * Releases and cleans up our dio_bio, no need to bio_put() | |
8369 | * nor bio_endio()/bio_io_error() against dio_bio. | |
8370 | */ | |
8371 | dio_end_io(dio_bio, ret); | |
4b46fce2 | 8372 | } |
61de718f FM |
8373 | if (io_bio) |
8374 | bio_put(io_bio); | |
8375 | kfree(dip); | |
4b46fce2 JB |
8376 | } |
8377 | ||
6f673763 | 8378 | static ssize_t check_direct_IO(struct btrfs_root *root, struct kiocb *iocb, |
28060d5d | 8379 | const struct iov_iter *iter, loff_t offset) |
5a5f79b5 CM |
8380 | { |
8381 | int seg; | |
a1b75f7d | 8382 | int i; |
5a5f79b5 CM |
8383 | unsigned blocksize_mask = root->sectorsize - 1; |
8384 | ssize_t retval = -EINVAL; | |
5a5f79b5 CM |
8385 | |
8386 | if (offset & blocksize_mask) | |
8387 | goto out; | |
8388 | ||
28060d5d AV |
8389 | if (iov_iter_alignment(iter) & blocksize_mask) |
8390 | goto out; | |
a1b75f7d | 8391 | |
28060d5d | 8392 | /* If this is a write we don't need to check anymore */ |
6f673763 | 8393 | if (iov_iter_rw(iter) == WRITE) |
28060d5d AV |
8394 | return 0; |
8395 | /* | |
8396 | * Check to make sure we don't have duplicate iov_base's in this | |
8397 | * iovec, if so return EINVAL, otherwise we'll get csum errors | |
8398 | * when reading back. | |
8399 | */ | |
8400 | for (seg = 0; seg < iter->nr_segs; seg++) { | |
8401 | for (i = seg + 1; i < iter->nr_segs; i++) { | |
8402 | if (iter->iov[seg].iov_base == iter->iov[i].iov_base) | |
a1b75f7d JB |
8403 | goto out; |
8404 | } | |
5a5f79b5 CM |
8405 | } |
8406 | retval = 0; | |
8407 | out: | |
8408 | return retval; | |
8409 | } | |
eb838e73 | 8410 | |
22c6186e OS |
8411 | static ssize_t btrfs_direct_IO(struct kiocb *iocb, struct iov_iter *iter, |
8412 | loff_t offset) | |
16432985 | 8413 | { |
4b46fce2 JB |
8414 | struct file *file = iocb->ki_filp; |
8415 | struct inode *inode = file->f_mapping->host; | |
50745b0a | 8416 | struct btrfs_root *root = BTRFS_I(inode)->root; |
8417 | struct btrfs_dio_data dio_data = { 0 }; | |
0934856d | 8418 | size_t count = 0; |
2e60a51e | 8419 | int flags = 0; |
38851cc1 MX |
8420 | bool wakeup = true; |
8421 | bool relock = false; | |
0934856d | 8422 | ssize_t ret; |
4b46fce2 | 8423 | |
6f673763 | 8424 | if (check_direct_IO(BTRFS_I(inode)->root, iocb, iter, offset)) |
5a5f79b5 | 8425 | return 0; |
3f7c579c | 8426 | |
fe0f07d0 | 8427 | inode_dio_begin(inode); |
4e857c58 | 8428 | smp_mb__after_atomic(); |
38851cc1 | 8429 | |
0e267c44 | 8430 | /* |
41bd9ca4 MX |
8431 | * The generic stuff only does filemap_write_and_wait_range, which |
8432 | * isn't enough if we've written compressed pages to this area, so | |
8433 | * we need to flush the dirty pages again to make absolutely sure | |
8434 | * that any outstanding dirty pages are on disk. | |
0e267c44 | 8435 | */ |
a6cbcd4a | 8436 | count = iov_iter_count(iter); |
41bd9ca4 MX |
8437 | if (test_bit(BTRFS_INODE_HAS_ASYNC_EXTENT, |
8438 | &BTRFS_I(inode)->runtime_flags)) | |
9a025a08 WS |
8439 | filemap_fdatawrite_range(inode->i_mapping, offset, |
8440 | offset + count - 1); | |
0e267c44 | 8441 | |
6f673763 | 8442 | if (iov_iter_rw(iter) == WRITE) { |
38851cc1 MX |
8443 | /* |
8444 | * If the write DIO is beyond the EOF, we need update | |
8445 | * the isize, but it is protected by i_mutex. So we can | |
8446 | * not unlock the i_mutex at this case. | |
8447 | */ | |
8448 | if (offset + count <= inode->i_size) { | |
8449 | mutex_unlock(&inode->i_mutex); | |
8450 | relock = true; | |
8451 | } | |
7cf5b976 | 8452 | ret = btrfs_delalloc_reserve_space(inode, offset, count); |
0934856d | 8453 | if (ret) |
38851cc1 | 8454 | goto out; |
50745b0a | 8455 | dio_data.outstanding_extents = div64_u64(count + |
e1cbbfa5 JB |
8456 | BTRFS_MAX_EXTENT_SIZE - 1, |
8457 | BTRFS_MAX_EXTENT_SIZE); | |
8458 | ||
8459 | /* | |
8460 | * We need to know how many extents we reserved so that we can | |
8461 | * do the accounting properly if we go over the number we | |
8462 | * originally calculated. Abuse current->journal_info for this. | |
8463 | */ | |
50745b0a | 8464 | dio_data.reserve = round_up(count, root->sectorsize); |
f28a4928 FM |
8465 | dio_data.unsubmitted_oe_range_start = (u64)offset; |
8466 | dio_data.unsubmitted_oe_range_end = (u64)offset; | |
50745b0a | 8467 | current->journal_info = &dio_data; |
ee39b432 DS |
8468 | } else if (test_bit(BTRFS_INODE_READDIO_NEED_LOCK, |
8469 | &BTRFS_I(inode)->runtime_flags)) { | |
fe0f07d0 | 8470 | inode_dio_end(inode); |
38851cc1 MX |
8471 | flags = DIO_LOCKING | DIO_SKIP_HOLES; |
8472 | wakeup = false; | |
0934856d MX |
8473 | } |
8474 | ||
17f8c842 OS |
8475 | ret = __blockdev_direct_IO(iocb, inode, |
8476 | BTRFS_I(inode)->root->fs_info->fs_devices->latest_bdev, | |
8477 | iter, offset, btrfs_get_blocks_direct, NULL, | |
8478 | btrfs_submit_direct, flags); | |
6f673763 | 8479 | if (iov_iter_rw(iter) == WRITE) { |
e1cbbfa5 | 8480 | current->journal_info = NULL; |
ddba1bfc | 8481 | if (ret < 0 && ret != -EIOCBQUEUED) { |
50745b0a | 8482 | if (dio_data.reserve) |
7cf5b976 QW |
8483 | btrfs_delalloc_release_space(inode, offset, |
8484 | dio_data.reserve); | |
f28a4928 FM |
8485 | /* |
8486 | * On error we might have left some ordered extents | |
8487 | * without submitting corresponding bios for them, so | |
8488 | * cleanup them up to avoid other tasks getting them | |
8489 | * and waiting for them to complete forever. | |
8490 | */ | |
8491 | if (dio_data.unsubmitted_oe_range_start < | |
8492 | dio_data.unsubmitted_oe_range_end) | |
8493 | btrfs_endio_direct_write_update_ordered(inode, | |
8494 | dio_data.unsubmitted_oe_range_start, | |
8495 | dio_data.unsubmitted_oe_range_end - | |
8496 | dio_data.unsubmitted_oe_range_start, | |
8497 | 0); | |
ddba1bfc | 8498 | } else if (ret >= 0 && (size_t)ret < count) |
7cf5b976 QW |
8499 | btrfs_delalloc_release_space(inode, offset, |
8500 | count - (size_t)ret); | |
0934856d | 8501 | } |
38851cc1 | 8502 | out: |
2e60a51e | 8503 | if (wakeup) |
fe0f07d0 | 8504 | inode_dio_end(inode); |
38851cc1 MX |
8505 | if (relock) |
8506 | mutex_lock(&inode->i_mutex); | |
0934856d MX |
8507 | |
8508 | return ret; | |
16432985 CM |
8509 | } |
8510 | ||
05dadc09 TI |
8511 | #define BTRFS_FIEMAP_FLAGS (FIEMAP_FLAG_SYNC) |
8512 | ||
1506fcc8 YS |
8513 | static int btrfs_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, |
8514 | __u64 start, __u64 len) | |
8515 | { | |
05dadc09 TI |
8516 | int ret; |
8517 | ||
8518 | ret = fiemap_check_flags(fieinfo, BTRFS_FIEMAP_FLAGS); | |
8519 | if (ret) | |
8520 | return ret; | |
8521 | ||
ec29ed5b | 8522 | return extent_fiemap(inode, fieinfo, start, len, btrfs_get_extent_fiemap); |
1506fcc8 YS |
8523 | } |
8524 | ||
a52d9a80 | 8525 | int btrfs_readpage(struct file *file, struct page *page) |
9ebefb18 | 8526 | { |
d1310b2e CM |
8527 | struct extent_io_tree *tree; |
8528 | tree = &BTRFS_I(page->mapping->host)->io_tree; | |
8ddc7d9c | 8529 | return extent_read_full_page(tree, page, btrfs_get_extent, 0); |
9ebefb18 | 8530 | } |
1832a6d5 | 8531 | |
a52d9a80 | 8532 | static int btrfs_writepage(struct page *page, struct writeback_control *wbc) |
39279cc3 | 8533 | { |
d1310b2e | 8534 | struct extent_io_tree *tree; |
be7bd730 JB |
8535 | struct inode *inode = page->mapping->host; |
8536 | int ret; | |
b888db2b CM |
8537 | |
8538 | if (current->flags & PF_MEMALLOC) { | |
8539 | redirty_page_for_writepage(wbc, page); | |
8540 | unlock_page(page); | |
8541 | return 0; | |
8542 | } | |
be7bd730 JB |
8543 | |
8544 | /* | |
8545 | * If we are under memory pressure we will call this directly from the | |
8546 | * VM, we need to make sure we have the inode referenced for the ordered | |
8547 | * extent. If not just return like we didn't do anything. | |
8548 | */ | |
8549 | if (!igrab(inode)) { | |
8550 | redirty_page_for_writepage(wbc, page); | |
8551 | return AOP_WRITEPAGE_ACTIVATE; | |
8552 | } | |
d1310b2e | 8553 | tree = &BTRFS_I(page->mapping->host)->io_tree; |
be7bd730 JB |
8554 | ret = extent_write_full_page(tree, page, btrfs_get_extent, wbc); |
8555 | btrfs_add_delayed_iput(inode); | |
8556 | return ret; | |
9ebefb18 CM |
8557 | } |
8558 | ||
48a3b636 ES |
8559 | static int btrfs_writepages(struct address_space *mapping, |
8560 | struct writeback_control *wbc) | |
b293f02e | 8561 | { |
d1310b2e | 8562 | struct extent_io_tree *tree; |
771ed689 | 8563 | |
d1310b2e | 8564 | tree = &BTRFS_I(mapping->host)->io_tree; |
b293f02e CM |
8565 | return extent_writepages(tree, mapping, btrfs_get_extent, wbc); |
8566 | } | |
8567 | ||
3ab2fb5a CM |
8568 | static int |
8569 | btrfs_readpages(struct file *file, struct address_space *mapping, | |
8570 | struct list_head *pages, unsigned nr_pages) | |
8571 | { | |
d1310b2e CM |
8572 | struct extent_io_tree *tree; |
8573 | tree = &BTRFS_I(mapping->host)->io_tree; | |
3ab2fb5a CM |
8574 | return extent_readpages(tree, mapping, pages, nr_pages, |
8575 | btrfs_get_extent); | |
8576 | } | |
e6dcd2dc | 8577 | static int __btrfs_releasepage(struct page *page, gfp_t gfp_flags) |
9ebefb18 | 8578 | { |
d1310b2e CM |
8579 | struct extent_io_tree *tree; |
8580 | struct extent_map_tree *map; | |
a52d9a80 | 8581 | int ret; |
8c2383c3 | 8582 | |
d1310b2e CM |
8583 | tree = &BTRFS_I(page->mapping->host)->io_tree; |
8584 | map = &BTRFS_I(page->mapping->host)->extent_tree; | |
70dec807 | 8585 | ret = try_release_extent_mapping(map, tree, page, gfp_flags); |
a52d9a80 CM |
8586 | if (ret == 1) { |
8587 | ClearPagePrivate(page); | |
8588 | set_page_private(page, 0); | |
8589 | page_cache_release(page); | |
39279cc3 | 8590 | } |
a52d9a80 | 8591 | return ret; |
39279cc3 CM |
8592 | } |
8593 | ||
e6dcd2dc CM |
8594 | static int btrfs_releasepage(struct page *page, gfp_t gfp_flags) |
8595 | { | |
98509cfc CM |
8596 | if (PageWriteback(page) || PageDirty(page)) |
8597 | return 0; | |
b335b003 | 8598 | return __btrfs_releasepage(page, gfp_flags & GFP_NOFS); |
e6dcd2dc CM |
8599 | } |
8600 | ||
d47992f8 LC |
8601 | static void btrfs_invalidatepage(struct page *page, unsigned int offset, |
8602 | unsigned int length) | |
39279cc3 | 8603 | { |
5fd02043 | 8604 | struct inode *inode = page->mapping->host; |
d1310b2e | 8605 | struct extent_io_tree *tree; |
e6dcd2dc | 8606 | struct btrfs_ordered_extent *ordered; |
2ac55d41 | 8607 | struct extent_state *cached_state = NULL; |
e6dcd2dc CM |
8608 | u64 page_start = page_offset(page); |
8609 | u64 page_end = page_start + PAGE_CACHE_SIZE - 1; | |
131e404a | 8610 | int inode_evicting = inode->i_state & I_FREEING; |
39279cc3 | 8611 | |
8b62b72b CM |
8612 | /* |
8613 | * we have the page locked, so new writeback can't start, | |
8614 | * and the dirty bit won't be cleared while we are here. | |
8615 | * | |
8616 | * Wait for IO on this page so that we can safely clear | |
8617 | * the PagePrivate2 bit and do ordered accounting | |
8618 | */ | |
e6dcd2dc | 8619 | wait_on_page_writeback(page); |
8b62b72b | 8620 | |
5fd02043 | 8621 | tree = &BTRFS_I(inode)->io_tree; |
e6dcd2dc CM |
8622 | if (offset) { |
8623 | btrfs_releasepage(page, GFP_NOFS); | |
8624 | return; | |
8625 | } | |
131e404a FDBM |
8626 | |
8627 | if (!inode_evicting) | |
ff13db41 | 8628 | lock_extent_bits(tree, page_start, page_end, &cached_state); |
131e404a | 8629 | ordered = btrfs_lookup_ordered_extent(inode, page_start); |
e6dcd2dc | 8630 | if (ordered) { |
eb84ae03 CM |
8631 | /* |
8632 | * IO on this page will never be started, so we need | |
8633 | * to account for any ordered extents now | |
8634 | */ | |
131e404a FDBM |
8635 | if (!inode_evicting) |
8636 | clear_extent_bit(tree, page_start, page_end, | |
8637 | EXTENT_DIRTY | EXTENT_DELALLOC | | |
8638 | EXTENT_LOCKED | EXTENT_DO_ACCOUNTING | | |
8639 | EXTENT_DEFRAG, 1, 0, &cached_state, | |
8640 | GFP_NOFS); | |
8b62b72b CM |
8641 | /* |
8642 | * whoever cleared the private bit is responsible | |
8643 | * for the finish_ordered_io | |
8644 | */ | |
77cef2ec JB |
8645 | if (TestClearPagePrivate2(page)) { |
8646 | struct btrfs_ordered_inode_tree *tree; | |
8647 | u64 new_len; | |
8648 | ||
8649 | tree = &BTRFS_I(inode)->ordered_tree; | |
8650 | ||
8651 | spin_lock_irq(&tree->lock); | |
8652 | set_bit(BTRFS_ORDERED_TRUNCATED, &ordered->flags); | |
8653 | new_len = page_start - ordered->file_offset; | |
8654 | if (new_len < ordered->truncated_len) | |
8655 | ordered->truncated_len = new_len; | |
8656 | spin_unlock_irq(&tree->lock); | |
8657 | ||
8658 | if (btrfs_dec_test_ordered_pending(inode, &ordered, | |
8659 | page_start, | |
8660 | PAGE_CACHE_SIZE, 1)) | |
8661 | btrfs_finish_ordered_io(ordered); | |
8b62b72b | 8662 | } |
e6dcd2dc | 8663 | btrfs_put_ordered_extent(ordered); |
131e404a FDBM |
8664 | if (!inode_evicting) { |
8665 | cached_state = NULL; | |
ff13db41 | 8666 | lock_extent_bits(tree, page_start, page_end, |
131e404a FDBM |
8667 | &cached_state); |
8668 | } | |
8669 | } | |
8670 | ||
b9d0b389 QW |
8671 | /* |
8672 | * Qgroup reserved space handler | |
8673 | * Page here will be either | |
8674 | * 1) Already written to disk | |
8675 | * In this case, its reserved space is released from data rsv map | |
8676 | * and will be freed by delayed_ref handler finally. | |
8677 | * So even we call qgroup_free_data(), it won't decrease reserved | |
8678 | * space. | |
8679 | * 2) Not written to disk | |
8680 | * This means the reserved space should be freed here. | |
8681 | */ | |
8682 | btrfs_qgroup_free_data(inode, page_start, PAGE_CACHE_SIZE); | |
131e404a FDBM |
8683 | if (!inode_evicting) { |
8684 | clear_extent_bit(tree, page_start, page_end, | |
8685 | EXTENT_LOCKED | EXTENT_DIRTY | | |
8686 | EXTENT_DELALLOC | EXTENT_DO_ACCOUNTING | | |
8687 | EXTENT_DEFRAG, 1, 1, | |
8688 | &cached_state, GFP_NOFS); | |
8689 | ||
8690 | __btrfs_releasepage(page, GFP_NOFS); | |
e6dcd2dc | 8691 | } |
e6dcd2dc | 8692 | |
4a096752 | 8693 | ClearPageChecked(page); |
9ad6b7bc | 8694 | if (PagePrivate(page)) { |
9ad6b7bc CM |
8695 | ClearPagePrivate(page); |
8696 | set_page_private(page, 0); | |
8697 | page_cache_release(page); | |
8698 | } | |
39279cc3 CM |
8699 | } |
8700 | ||
9ebefb18 CM |
8701 | /* |
8702 | * btrfs_page_mkwrite() is not allowed to change the file size as it gets | |
8703 | * called from a page fault handler when a page is first dirtied. Hence we must | |
8704 | * be careful to check for EOF conditions here. We set the page up correctly | |
8705 | * for a written page which means we get ENOSPC checking when writing into | |
8706 | * holes and correct delalloc and unwritten extent mapping on filesystems that | |
8707 | * support these features. | |
8708 | * | |
8709 | * We are not allowed to take the i_mutex here so we have to play games to | |
8710 | * protect against truncate races as the page could now be beyond EOF. Because | |
8711 | * vmtruncate() writes the inode size before removing pages, once we have the | |
8712 | * page lock we can determine safely if the page is beyond EOF. If it is not | |
8713 | * beyond EOF, then the page is guaranteed safe against truncation until we | |
8714 | * unlock the page. | |
8715 | */ | |
c2ec175c | 8716 | int btrfs_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf) |
9ebefb18 | 8717 | { |
c2ec175c | 8718 | struct page *page = vmf->page; |
496ad9aa | 8719 | struct inode *inode = file_inode(vma->vm_file); |
1832a6d5 | 8720 | struct btrfs_root *root = BTRFS_I(inode)->root; |
e6dcd2dc CM |
8721 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; |
8722 | struct btrfs_ordered_extent *ordered; | |
2ac55d41 | 8723 | struct extent_state *cached_state = NULL; |
e6dcd2dc CM |
8724 | char *kaddr; |
8725 | unsigned long zero_start; | |
9ebefb18 | 8726 | loff_t size; |
1832a6d5 | 8727 | int ret; |
9998eb70 | 8728 | int reserved = 0; |
a52d9a80 | 8729 | u64 page_start; |
e6dcd2dc | 8730 | u64 page_end; |
9ebefb18 | 8731 | |
b2b5ef5c | 8732 | sb_start_pagefault(inode->i_sb); |
df480633 QW |
8733 | page_start = page_offset(page); |
8734 | page_end = page_start + PAGE_CACHE_SIZE - 1; | |
8735 | ||
7cf5b976 QW |
8736 | ret = btrfs_delalloc_reserve_space(inode, page_start, |
8737 | PAGE_CACHE_SIZE); | |
9998eb70 | 8738 | if (!ret) { |
e41f941a | 8739 | ret = file_update_time(vma->vm_file); |
9998eb70 CM |
8740 | reserved = 1; |
8741 | } | |
56a76f82 NP |
8742 | if (ret) { |
8743 | if (ret == -ENOMEM) | |
8744 | ret = VM_FAULT_OOM; | |
8745 | else /* -ENOSPC, -EIO, etc */ | |
8746 | ret = VM_FAULT_SIGBUS; | |
9998eb70 CM |
8747 | if (reserved) |
8748 | goto out; | |
8749 | goto out_noreserve; | |
56a76f82 | 8750 | } |
1832a6d5 | 8751 | |
56a76f82 | 8752 | ret = VM_FAULT_NOPAGE; /* make the VM retry the fault */ |
e6dcd2dc | 8753 | again: |
9ebefb18 | 8754 | lock_page(page); |
9ebefb18 | 8755 | size = i_size_read(inode); |
a52d9a80 | 8756 | |
9ebefb18 | 8757 | if ((page->mapping != inode->i_mapping) || |
e6dcd2dc | 8758 | (page_start >= size)) { |
9ebefb18 CM |
8759 | /* page got truncated out from underneath us */ |
8760 | goto out_unlock; | |
8761 | } | |
e6dcd2dc CM |
8762 | wait_on_page_writeback(page); |
8763 | ||
ff13db41 | 8764 | lock_extent_bits(io_tree, page_start, page_end, &cached_state); |
e6dcd2dc CM |
8765 | set_page_extent_mapped(page); |
8766 | ||
eb84ae03 CM |
8767 | /* |
8768 | * we can't set the delalloc bits if there are pending ordered | |
8769 | * extents. Drop our locks and wait for them to finish | |
8770 | */ | |
e6dcd2dc CM |
8771 | ordered = btrfs_lookup_ordered_extent(inode, page_start); |
8772 | if (ordered) { | |
2ac55d41 JB |
8773 | unlock_extent_cached(io_tree, page_start, page_end, |
8774 | &cached_state, GFP_NOFS); | |
e6dcd2dc | 8775 | unlock_page(page); |
eb84ae03 | 8776 | btrfs_start_ordered_extent(inode, ordered, 1); |
e6dcd2dc CM |
8777 | btrfs_put_ordered_extent(ordered); |
8778 | goto again; | |
8779 | } | |
8780 | ||
fbf19087 JB |
8781 | /* |
8782 | * XXX - page_mkwrite gets called every time the page is dirtied, even | |
8783 | * if it was already dirty, so for space accounting reasons we need to | |
8784 | * clear any delalloc bits for the range we are fixing to save. There | |
8785 | * is probably a better way to do this, but for now keep consistent with | |
8786 | * prepare_pages in the normal write path. | |
8787 | */ | |
2ac55d41 | 8788 | clear_extent_bit(&BTRFS_I(inode)->io_tree, page_start, page_end, |
9e8a4a8b LB |
8789 | EXTENT_DIRTY | EXTENT_DELALLOC | |
8790 | EXTENT_DO_ACCOUNTING | EXTENT_DEFRAG, | |
2ac55d41 | 8791 | 0, 0, &cached_state, GFP_NOFS); |
fbf19087 | 8792 | |
2ac55d41 JB |
8793 | ret = btrfs_set_extent_delalloc(inode, page_start, page_end, |
8794 | &cached_state); | |
9ed74f2d | 8795 | if (ret) { |
2ac55d41 JB |
8796 | unlock_extent_cached(io_tree, page_start, page_end, |
8797 | &cached_state, GFP_NOFS); | |
9ed74f2d JB |
8798 | ret = VM_FAULT_SIGBUS; |
8799 | goto out_unlock; | |
8800 | } | |
e6dcd2dc | 8801 | ret = 0; |
9ebefb18 CM |
8802 | |
8803 | /* page is wholly or partially inside EOF */ | |
a52d9a80 | 8804 | if (page_start + PAGE_CACHE_SIZE > size) |
e6dcd2dc | 8805 | zero_start = size & ~PAGE_CACHE_MASK; |
9ebefb18 | 8806 | else |
e6dcd2dc | 8807 | zero_start = PAGE_CACHE_SIZE; |
9ebefb18 | 8808 | |
e6dcd2dc CM |
8809 | if (zero_start != PAGE_CACHE_SIZE) { |
8810 | kaddr = kmap(page); | |
8811 | memset(kaddr + zero_start, 0, PAGE_CACHE_SIZE - zero_start); | |
8812 | flush_dcache_page(page); | |
8813 | kunmap(page); | |
8814 | } | |
247e743c | 8815 | ClearPageChecked(page); |
e6dcd2dc | 8816 | set_page_dirty(page); |
50a9b214 | 8817 | SetPageUptodate(page); |
5a3f23d5 | 8818 | |
257c62e1 CM |
8819 | BTRFS_I(inode)->last_trans = root->fs_info->generation; |
8820 | BTRFS_I(inode)->last_sub_trans = BTRFS_I(inode)->root->log_transid; | |
46d8bc34 | 8821 | BTRFS_I(inode)->last_log_commit = BTRFS_I(inode)->root->last_log_commit; |
257c62e1 | 8822 | |
2ac55d41 | 8823 | unlock_extent_cached(io_tree, page_start, page_end, &cached_state, GFP_NOFS); |
9ebefb18 CM |
8824 | |
8825 | out_unlock: | |
b2b5ef5c JK |
8826 | if (!ret) { |
8827 | sb_end_pagefault(inode->i_sb); | |
50a9b214 | 8828 | return VM_FAULT_LOCKED; |
b2b5ef5c | 8829 | } |
9ebefb18 | 8830 | unlock_page(page); |
1832a6d5 | 8831 | out: |
7cf5b976 | 8832 | btrfs_delalloc_release_space(inode, page_start, PAGE_CACHE_SIZE); |
9998eb70 | 8833 | out_noreserve: |
b2b5ef5c | 8834 | sb_end_pagefault(inode->i_sb); |
9ebefb18 CM |
8835 | return ret; |
8836 | } | |
8837 | ||
a41ad394 | 8838 | static int btrfs_truncate(struct inode *inode) |
39279cc3 CM |
8839 | { |
8840 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
fcb80c2a | 8841 | struct btrfs_block_rsv *rsv; |
a71754fc | 8842 | int ret = 0; |
3893e33b | 8843 | int err = 0; |
39279cc3 | 8844 | struct btrfs_trans_handle *trans; |
dbe674a9 | 8845 | u64 mask = root->sectorsize - 1; |
07127184 | 8846 | u64 min_size = btrfs_calc_trunc_metadata_size(root, 1); |
39279cc3 | 8847 | |
0ef8b726 JB |
8848 | ret = btrfs_wait_ordered_range(inode, inode->i_size & (~mask), |
8849 | (u64)-1); | |
8850 | if (ret) | |
8851 | return ret; | |
39279cc3 | 8852 | |
fcb80c2a JB |
8853 | /* |
8854 | * Yes ladies and gentelment, this is indeed ugly. The fact is we have | |
8855 | * 3 things going on here | |
8856 | * | |
8857 | * 1) We need to reserve space for our orphan item and the space to | |
8858 | * delete our orphan item. Lord knows we don't want to have a dangling | |
8859 | * orphan item because we didn't reserve space to remove it. | |
8860 | * | |
8861 | * 2) We need to reserve space to update our inode. | |
8862 | * | |
8863 | * 3) We need to have something to cache all the space that is going to | |
8864 | * be free'd up by the truncate operation, but also have some slack | |
8865 | * space reserved in case it uses space during the truncate (thank you | |
8866 | * very much snapshotting). | |
8867 | * | |
8868 | * And we need these to all be seperate. The fact is we can use alot of | |
8869 | * space doing the truncate, and we have no earthly idea how much space | |
8870 | * we will use, so we need the truncate reservation to be seperate so it | |
8871 | * doesn't end up using space reserved for updating the inode or | |
8872 | * removing the orphan item. We also need to be able to stop the | |
8873 | * transaction and start a new one, which means we need to be able to | |
8874 | * update the inode several times, and we have no idea of knowing how | |
8875 | * many times that will be, so we can't just reserve 1 item for the | |
8876 | * entirety of the opration, so that has to be done seperately as well. | |
8877 | * Then there is the orphan item, which does indeed need to be held on | |
8878 | * to for the whole operation, and we need nobody to touch this reserved | |
8879 | * space except the orphan code. | |
8880 | * | |
8881 | * So that leaves us with | |
8882 | * | |
8883 | * 1) root->orphan_block_rsv - for the orphan deletion. | |
8884 | * 2) rsv - for the truncate reservation, which we will steal from the | |
8885 | * transaction reservation. | |
8886 | * 3) fs_info->trans_block_rsv - this will have 1 items worth left for | |
8887 | * updating the inode. | |
8888 | */ | |
66d8f3dd | 8889 | rsv = btrfs_alloc_block_rsv(root, BTRFS_BLOCK_RSV_TEMP); |
fcb80c2a JB |
8890 | if (!rsv) |
8891 | return -ENOMEM; | |
4a338542 | 8892 | rsv->size = min_size; |
ca7e70f5 | 8893 | rsv->failfast = 1; |
f0cd846e | 8894 | |
907cbceb | 8895 | /* |
07127184 | 8896 | * 1 for the truncate slack space |
907cbceb JB |
8897 | * 1 for updating the inode. |
8898 | */ | |
f3fe820c | 8899 | trans = btrfs_start_transaction(root, 2); |
fcb80c2a JB |
8900 | if (IS_ERR(trans)) { |
8901 | err = PTR_ERR(trans); | |
8902 | goto out; | |
8903 | } | |
f0cd846e | 8904 | |
907cbceb JB |
8905 | /* Migrate the slack space for the truncate to our reserve */ |
8906 | ret = btrfs_block_rsv_migrate(&root->fs_info->trans_block_rsv, rsv, | |
8907 | min_size); | |
fcb80c2a | 8908 | BUG_ON(ret); |
f0cd846e | 8909 | |
5dc562c5 JB |
8910 | /* |
8911 | * So if we truncate and then write and fsync we normally would just | |
8912 | * write the extents that changed, which is a problem if we need to | |
8913 | * first truncate that entire inode. So set this flag so we write out | |
8914 | * all of the extents in the inode to the sync log so we're completely | |
8915 | * safe. | |
8916 | */ | |
8917 | set_bit(BTRFS_INODE_NEEDS_FULL_SYNC, &BTRFS_I(inode)->runtime_flags); | |
ca7e70f5 | 8918 | trans->block_rsv = rsv; |
907cbceb | 8919 | |
8082510e YZ |
8920 | while (1) { |
8921 | ret = btrfs_truncate_inode_items(trans, root, inode, | |
8922 | inode->i_size, | |
8923 | BTRFS_EXTENT_DATA_KEY); | |
28ed1345 | 8924 | if (ret != -ENOSPC && ret != -EAGAIN) { |
3893e33b | 8925 | err = ret; |
8082510e | 8926 | break; |
3893e33b | 8927 | } |
39279cc3 | 8928 | |
fcb80c2a | 8929 | trans->block_rsv = &root->fs_info->trans_block_rsv; |
8082510e | 8930 | ret = btrfs_update_inode(trans, root, inode); |
3893e33b JB |
8931 | if (ret) { |
8932 | err = ret; | |
8933 | break; | |
8934 | } | |
ca7e70f5 | 8935 | |
8082510e | 8936 | btrfs_end_transaction(trans, root); |
b53d3f5d | 8937 | btrfs_btree_balance_dirty(root); |
ca7e70f5 JB |
8938 | |
8939 | trans = btrfs_start_transaction(root, 2); | |
8940 | if (IS_ERR(trans)) { | |
8941 | ret = err = PTR_ERR(trans); | |
8942 | trans = NULL; | |
8943 | break; | |
8944 | } | |
8945 | ||
8946 | ret = btrfs_block_rsv_migrate(&root->fs_info->trans_block_rsv, | |
8947 | rsv, min_size); | |
8948 | BUG_ON(ret); /* shouldn't happen */ | |
8949 | trans->block_rsv = rsv; | |
8082510e YZ |
8950 | } |
8951 | ||
8952 | if (ret == 0 && inode->i_nlink > 0) { | |
fcb80c2a | 8953 | trans->block_rsv = root->orphan_block_rsv; |
8082510e | 8954 | ret = btrfs_orphan_del(trans, inode); |
3893e33b JB |
8955 | if (ret) |
8956 | err = ret; | |
8082510e YZ |
8957 | } |
8958 | ||
917c16b2 CM |
8959 | if (trans) { |
8960 | trans->block_rsv = &root->fs_info->trans_block_rsv; | |
8961 | ret = btrfs_update_inode(trans, root, inode); | |
8962 | if (ret && !err) | |
8963 | err = ret; | |
7b128766 | 8964 | |
7ad85bb7 | 8965 | ret = btrfs_end_transaction(trans, root); |
b53d3f5d | 8966 | btrfs_btree_balance_dirty(root); |
917c16b2 | 8967 | } |
fcb80c2a JB |
8968 | |
8969 | out: | |
8970 | btrfs_free_block_rsv(root, rsv); | |
8971 | ||
3893e33b JB |
8972 | if (ret && !err) |
8973 | err = ret; | |
a41ad394 | 8974 | |
3893e33b | 8975 | return err; |
39279cc3 CM |
8976 | } |
8977 | ||
d352ac68 CM |
8978 | /* |
8979 | * create a new subvolume directory/inode (helper for the ioctl). | |
8980 | */ | |
d2fb3437 | 8981 | int btrfs_create_subvol_root(struct btrfs_trans_handle *trans, |
63541927 FDBM |
8982 | struct btrfs_root *new_root, |
8983 | struct btrfs_root *parent_root, | |
8984 | u64 new_dirid) | |
39279cc3 | 8985 | { |
39279cc3 | 8986 | struct inode *inode; |
76dda93c | 8987 | int err; |
00e4e6b3 | 8988 | u64 index = 0; |
39279cc3 | 8989 | |
12fc9d09 FA |
8990 | inode = btrfs_new_inode(trans, new_root, NULL, "..", 2, |
8991 | new_dirid, new_dirid, | |
8992 | S_IFDIR | (~current_umask() & S_IRWXUGO), | |
8993 | &index); | |
54aa1f4d | 8994 | if (IS_ERR(inode)) |
f46b5a66 | 8995 | return PTR_ERR(inode); |
39279cc3 CM |
8996 | inode->i_op = &btrfs_dir_inode_operations; |
8997 | inode->i_fop = &btrfs_dir_file_operations; | |
8998 | ||
bfe86848 | 8999 | set_nlink(inode, 1); |
dbe674a9 | 9000 | btrfs_i_size_write(inode, 0); |
b0d5d10f | 9001 | unlock_new_inode(inode); |
3b96362c | 9002 | |
63541927 FDBM |
9003 | err = btrfs_subvol_inherit_props(trans, new_root, parent_root); |
9004 | if (err) | |
9005 | btrfs_err(new_root->fs_info, | |
351fd353 | 9006 | "error inheriting subvolume %llu properties: %d", |
63541927 FDBM |
9007 | new_root->root_key.objectid, err); |
9008 | ||
76dda93c | 9009 | err = btrfs_update_inode(trans, new_root, inode); |
cb8e7090 | 9010 | |
76dda93c | 9011 | iput(inode); |
ce598979 | 9012 | return err; |
39279cc3 CM |
9013 | } |
9014 | ||
39279cc3 CM |
9015 | struct inode *btrfs_alloc_inode(struct super_block *sb) |
9016 | { | |
9017 | struct btrfs_inode *ei; | |
2ead6ae7 | 9018 | struct inode *inode; |
39279cc3 CM |
9019 | |
9020 | ei = kmem_cache_alloc(btrfs_inode_cachep, GFP_NOFS); | |
9021 | if (!ei) | |
9022 | return NULL; | |
2ead6ae7 YZ |
9023 | |
9024 | ei->root = NULL; | |
2ead6ae7 | 9025 | ei->generation = 0; |
15ee9bc7 | 9026 | ei->last_trans = 0; |
257c62e1 | 9027 | ei->last_sub_trans = 0; |
e02119d5 | 9028 | ei->logged_trans = 0; |
2ead6ae7 | 9029 | ei->delalloc_bytes = 0; |
47059d93 | 9030 | ei->defrag_bytes = 0; |
2ead6ae7 YZ |
9031 | ei->disk_i_size = 0; |
9032 | ei->flags = 0; | |
7709cde3 | 9033 | ei->csum_bytes = 0; |
2ead6ae7 | 9034 | ei->index_cnt = (u64)-1; |
67de1176 | 9035 | ei->dir_index = 0; |
2ead6ae7 | 9036 | ei->last_unlink_trans = 0; |
46d8bc34 | 9037 | ei->last_log_commit = 0; |
8089fe62 | 9038 | ei->delayed_iput_count = 0; |
2ead6ae7 | 9039 | |
9e0baf60 JB |
9040 | spin_lock_init(&ei->lock); |
9041 | ei->outstanding_extents = 0; | |
9042 | ei->reserved_extents = 0; | |
2ead6ae7 | 9043 | |
72ac3c0d | 9044 | ei->runtime_flags = 0; |
261507a0 | 9045 | ei->force_compress = BTRFS_COMPRESS_NONE; |
2ead6ae7 | 9046 | |
16cdcec7 MX |
9047 | ei->delayed_node = NULL; |
9048 | ||
9cc97d64 | 9049 | ei->i_otime.tv_sec = 0; |
9050 | ei->i_otime.tv_nsec = 0; | |
9051 | ||
2ead6ae7 | 9052 | inode = &ei->vfs_inode; |
a8067e02 | 9053 | extent_map_tree_init(&ei->extent_tree); |
f993c883 DS |
9054 | extent_io_tree_init(&ei->io_tree, &inode->i_data); |
9055 | extent_io_tree_init(&ei->io_failure_tree, &inode->i_data); | |
0b32f4bb JB |
9056 | ei->io_tree.track_uptodate = 1; |
9057 | ei->io_failure_tree.track_uptodate = 1; | |
b812ce28 | 9058 | atomic_set(&ei->sync_writers, 0); |
2ead6ae7 | 9059 | mutex_init(&ei->log_mutex); |
f248679e | 9060 | mutex_init(&ei->delalloc_mutex); |
e6dcd2dc | 9061 | btrfs_ordered_inode_tree_init(&ei->ordered_tree); |
2ead6ae7 | 9062 | INIT_LIST_HEAD(&ei->delalloc_inodes); |
8089fe62 | 9063 | INIT_LIST_HEAD(&ei->delayed_iput); |
2ead6ae7 YZ |
9064 | RB_CLEAR_NODE(&ei->rb_node); |
9065 | ||
9066 | return inode; | |
39279cc3 CM |
9067 | } |
9068 | ||
aaedb55b JB |
9069 | #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS |
9070 | void btrfs_test_destroy_inode(struct inode *inode) | |
9071 | { | |
9072 | btrfs_drop_extent_cache(inode, 0, (u64)-1, 0); | |
9073 | kmem_cache_free(btrfs_inode_cachep, BTRFS_I(inode)); | |
9074 | } | |
9075 | #endif | |
9076 | ||
fa0d7e3d NP |
9077 | static void btrfs_i_callback(struct rcu_head *head) |
9078 | { | |
9079 | struct inode *inode = container_of(head, struct inode, i_rcu); | |
fa0d7e3d NP |
9080 | kmem_cache_free(btrfs_inode_cachep, BTRFS_I(inode)); |
9081 | } | |
9082 | ||
39279cc3 CM |
9083 | void btrfs_destroy_inode(struct inode *inode) |
9084 | { | |
e6dcd2dc | 9085 | struct btrfs_ordered_extent *ordered; |
5a3f23d5 CM |
9086 | struct btrfs_root *root = BTRFS_I(inode)->root; |
9087 | ||
b3d9b7a3 | 9088 | WARN_ON(!hlist_empty(&inode->i_dentry)); |
39279cc3 | 9089 | WARN_ON(inode->i_data.nrpages); |
9e0baf60 JB |
9090 | WARN_ON(BTRFS_I(inode)->outstanding_extents); |
9091 | WARN_ON(BTRFS_I(inode)->reserved_extents); | |
7709cde3 JB |
9092 | WARN_ON(BTRFS_I(inode)->delalloc_bytes); |
9093 | WARN_ON(BTRFS_I(inode)->csum_bytes); | |
47059d93 | 9094 | WARN_ON(BTRFS_I(inode)->defrag_bytes); |
39279cc3 | 9095 | |
a6dbd429 JB |
9096 | /* |
9097 | * This can happen where we create an inode, but somebody else also | |
9098 | * created the same inode and we need to destroy the one we already | |
9099 | * created. | |
9100 | */ | |
9101 | if (!root) | |
9102 | goto free; | |
9103 | ||
8a35d95f JB |
9104 | if (test_bit(BTRFS_INODE_HAS_ORPHAN_ITEM, |
9105 | &BTRFS_I(inode)->runtime_flags)) { | |
c2cf52eb | 9106 | btrfs_info(root->fs_info, "inode %llu still on the orphan list", |
c1c9ff7c | 9107 | btrfs_ino(inode)); |
8a35d95f | 9108 | atomic_dec(&root->orphan_inodes); |
7b128766 | 9109 | } |
7b128766 | 9110 | |
d397712b | 9111 | while (1) { |
e6dcd2dc CM |
9112 | ordered = btrfs_lookup_first_ordered_extent(inode, (u64)-1); |
9113 | if (!ordered) | |
9114 | break; | |
9115 | else { | |
c2cf52eb | 9116 | btrfs_err(root->fs_info, "found ordered extent %llu %llu on inode cleanup", |
c1c9ff7c | 9117 | ordered->file_offset, ordered->len); |
e6dcd2dc CM |
9118 | btrfs_remove_ordered_extent(inode, ordered); |
9119 | btrfs_put_ordered_extent(ordered); | |
9120 | btrfs_put_ordered_extent(ordered); | |
9121 | } | |
9122 | } | |
56fa9d07 | 9123 | btrfs_qgroup_check_reserved_leak(inode); |
5d4f98a2 | 9124 | inode_tree_del(inode); |
5b21f2ed | 9125 | btrfs_drop_extent_cache(inode, 0, (u64)-1, 0); |
a6dbd429 | 9126 | free: |
fa0d7e3d | 9127 | call_rcu(&inode->i_rcu, btrfs_i_callback); |
39279cc3 CM |
9128 | } |
9129 | ||
45321ac5 | 9130 | int btrfs_drop_inode(struct inode *inode) |
76dda93c YZ |
9131 | { |
9132 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
45321ac5 | 9133 | |
6379ef9f NA |
9134 | if (root == NULL) |
9135 | return 1; | |
9136 | ||
fa6ac876 | 9137 | /* the snap/subvol tree is on deleting */ |
69e9c6c6 | 9138 | if (btrfs_root_refs(&root->root_item) == 0) |
45321ac5 | 9139 | return 1; |
76dda93c | 9140 | else |
45321ac5 | 9141 | return generic_drop_inode(inode); |
76dda93c YZ |
9142 | } |
9143 | ||
0ee0fda0 | 9144 | static void init_once(void *foo) |
39279cc3 CM |
9145 | { |
9146 | struct btrfs_inode *ei = (struct btrfs_inode *) foo; | |
9147 | ||
9148 | inode_init_once(&ei->vfs_inode); | |
9149 | } | |
9150 | ||
9151 | void btrfs_destroy_cachep(void) | |
9152 | { | |
8c0a8537 KS |
9153 | /* |
9154 | * Make sure all delayed rcu free inodes are flushed before we | |
9155 | * destroy cache. | |
9156 | */ | |
9157 | rcu_barrier(); | |
39279cc3 CM |
9158 | if (btrfs_inode_cachep) |
9159 | kmem_cache_destroy(btrfs_inode_cachep); | |
9160 | if (btrfs_trans_handle_cachep) | |
9161 | kmem_cache_destroy(btrfs_trans_handle_cachep); | |
9162 | if (btrfs_transaction_cachep) | |
9163 | kmem_cache_destroy(btrfs_transaction_cachep); | |
39279cc3 CM |
9164 | if (btrfs_path_cachep) |
9165 | kmem_cache_destroy(btrfs_path_cachep); | |
dc89e982 JB |
9166 | if (btrfs_free_space_cachep) |
9167 | kmem_cache_destroy(btrfs_free_space_cachep); | |
39279cc3 CM |
9168 | } |
9169 | ||
9170 | int btrfs_init_cachep(void) | |
9171 | { | |
837e1972 | 9172 | btrfs_inode_cachep = kmem_cache_create("btrfs_inode", |
9601e3f6 CH |
9173 | sizeof(struct btrfs_inode), 0, |
9174 | SLAB_RECLAIM_ACCOUNT | SLAB_MEM_SPREAD, init_once); | |
39279cc3 CM |
9175 | if (!btrfs_inode_cachep) |
9176 | goto fail; | |
9601e3f6 | 9177 | |
837e1972 | 9178 | btrfs_trans_handle_cachep = kmem_cache_create("btrfs_trans_handle", |
9601e3f6 CH |
9179 | sizeof(struct btrfs_trans_handle), 0, |
9180 | SLAB_RECLAIM_ACCOUNT | SLAB_MEM_SPREAD, NULL); | |
39279cc3 CM |
9181 | if (!btrfs_trans_handle_cachep) |
9182 | goto fail; | |
9601e3f6 | 9183 | |
837e1972 | 9184 | btrfs_transaction_cachep = kmem_cache_create("btrfs_transaction", |
9601e3f6 CH |
9185 | sizeof(struct btrfs_transaction), 0, |
9186 | SLAB_RECLAIM_ACCOUNT | SLAB_MEM_SPREAD, NULL); | |
39279cc3 CM |
9187 | if (!btrfs_transaction_cachep) |
9188 | goto fail; | |
9601e3f6 | 9189 | |
837e1972 | 9190 | btrfs_path_cachep = kmem_cache_create("btrfs_path", |
9601e3f6 CH |
9191 | sizeof(struct btrfs_path), 0, |
9192 | SLAB_RECLAIM_ACCOUNT | SLAB_MEM_SPREAD, NULL); | |
39279cc3 CM |
9193 | if (!btrfs_path_cachep) |
9194 | goto fail; | |
9601e3f6 | 9195 | |
837e1972 | 9196 | btrfs_free_space_cachep = kmem_cache_create("btrfs_free_space", |
dc89e982 JB |
9197 | sizeof(struct btrfs_free_space), 0, |
9198 | SLAB_RECLAIM_ACCOUNT | SLAB_MEM_SPREAD, NULL); | |
9199 | if (!btrfs_free_space_cachep) | |
9200 | goto fail; | |
9201 | ||
39279cc3 CM |
9202 | return 0; |
9203 | fail: | |
9204 | btrfs_destroy_cachep(); | |
9205 | return -ENOMEM; | |
9206 | } | |
9207 | ||
9208 | static int btrfs_getattr(struct vfsmount *mnt, | |
9209 | struct dentry *dentry, struct kstat *stat) | |
9210 | { | |
df0af1a5 | 9211 | u64 delalloc_bytes; |
2b0143b5 | 9212 | struct inode *inode = d_inode(dentry); |
fadc0d8b DS |
9213 | u32 blocksize = inode->i_sb->s_blocksize; |
9214 | ||
39279cc3 | 9215 | generic_fillattr(inode, stat); |
0ee5dc67 | 9216 | stat->dev = BTRFS_I(inode)->root->anon_dev; |
d6667462 | 9217 | stat->blksize = PAGE_CACHE_SIZE; |
df0af1a5 MX |
9218 | |
9219 | spin_lock(&BTRFS_I(inode)->lock); | |
9220 | delalloc_bytes = BTRFS_I(inode)->delalloc_bytes; | |
9221 | spin_unlock(&BTRFS_I(inode)->lock); | |
fadc0d8b | 9222 | stat->blocks = (ALIGN(inode_get_bytes(inode), blocksize) + |
df0af1a5 | 9223 | ALIGN(delalloc_bytes, blocksize)) >> 9; |
39279cc3 CM |
9224 | return 0; |
9225 | } | |
9226 | ||
d397712b CM |
9227 | static int btrfs_rename(struct inode *old_dir, struct dentry *old_dentry, |
9228 | struct inode *new_dir, struct dentry *new_dentry) | |
39279cc3 CM |
9229 | { |
9230 | struct btrfs_trans_handle *trans; | |
9231 | struct btrfs_root *root = BTRFS_I(old_dir)->root; | |
4df27c4d | 9232 | struct btrfs_root *dest = BTRFS_I(new_dir)->root; |
2b0143b5 DH |
9233 | struct inode *new_inode = d_inode(new_dentry); |
9234 | struct inode *old_inode = d_inode(old_dentry); | |
39279cc3 | 9235 | struct timespec ctime = CURRENT_TIME; |
00e4e6b3 | 9236 | u64 index = 0; |
4df27c4d | 9237 | u64 root_objectid; |
39279cc3 | 9238 | int ret; |
33345d01 | 9239 | u64 old_ino = btrfs_ino(old_inode); |
39279cc3 | 9240 | |
33345d01 | 9241 | if (btrfs_ino(new_dir) == BTRFS_EMPTY_SUBVOL_DIR_OBJECTID) |
f679a840 YZ |
9242 | return -EPERM; |
9243 | ||
4df27c4d | 9244 | /* we only allow rename subvolume link between subvolumes */ |
33345d01 | 9245 | if (old_ino != BTRFS_FIRST_FREE_OBJECTID && root != dest) |
3394e160 CM |
9246 | return -EXDEV; |
9247 | ||
33345d01 LZ |
9248 | if (old_ino == BTRFS_EMPTY_SUBVOL_DIR_OBJECTID || |
9249 | (new_inode && btrfs_ino(new_inode) == BTRFS_FIRST_FREE_OBJECTID)) | |
39279cc3 | 9250 | return -ENOTEMPTY; |
5f39d397 | 9251 | |
4df27c4d YZ |
9252 | if (S_ISDIR(old_inode->i_mode) && new_inode && |
9253 | new_inode->i_size > BTRFS_EMPTY_DIR_SIZE) | |
9254 | return -ENOTEMPTY; | |
9c52057c CM |
9255 | |
9256 | ||
9257 | /* check for collisions, even if the name isn't there */ | |
4871c158 | 9258 | ret = btrfs_check_dir_item_collision(dest, new_dir->i_ino, |
9c52057c CM |
9259 | new_dentry->d_name.name, |
9260 | new_dentry->d_name.len); | |
9261 | ||
9262 | if (ret) { | |
9263 | if (ret == -EEXIST) { | |
9264 | /* we shouldn't get | |
9265 | * eexist without a new_inode */ | |
fae7f21c | 9266 | if (WARN_ON(!new_inode)) { |
9c52057c CM |
9267 | return ret; |
9268 | } | |
9269 | } else { | |
9270 | /* maybe -EOVERFLOW */ | |
9271 | return ret; | |
9272 | } | |
9273 | } | |
9274 | ret = 0; | |
9275 | ||
5a3f23d5 | 9276 | /* |
8d875f95 CM |
9277 | * we're using rename to replace one file with another. Start IO on it |
9278 | * now so we don't add too much work to the end of the transaction | |
5a3f23d5 | 9279 | */ |
8d875f95 | 9280 | if (new_inode && S_ISREG(old_inode->i_mode) && new_inode->i_size) |
5a3f23d5 CM |
9281 | filemap_flush(old_inode->i_mapping); |
9282 | ||
76dda93c | 9283 | /* close the racy window with snapshot create/destroy ioctl */ |
33345d01 | 9284 | if (old_ino == BTRFS_FIRST_FREE_OBJECTID) |
76dda93c | 9285 | down_read(&root->fs_info->subvol_sem); |
a22285a6 YZ |
9286 | /* |
9287 | * We want to reserve the absolute worst case amount of items. So if | |
9288 | * both inodes are subvols and we need to unlink them then that would | |
9289 | * require 4 item modifications, but if they are both normal inodes it | |
9290 | * would require 5 item modifications, so we'll assume their normal | |
9291 | * inodes. So 5 * 2 is 10, plus 1 for the new link, so 11 total items | |
9292 | * should cover the worst case number of items we'll modify. | |
9293 | */ | |
6e137ed3 | 9294 | trans = btrfs_start_transaction(root, 11); |
b44c59a8 JL |
9295 | if (IS_ERR(trans)) { |
9296 | ret = PTR_ERR(trans); | |
9297 | goto out_notrans; | |
9298 | } | |
76dda93c | 9299 | |
4df27c4d YZ |
9300 | if (dest != root) |
9301 | btrfs_record_root_in_trans(trans, dest); | |
5f39d397 | 9302 | |
a5719521 YZ |
9303 | ret = btrfs_set_inode_index(new_dir, &index); |
9304 | if (ret) | |
9305 | goto out_fail; | |
5a3f23d5 | 9306 | |
67de1176 | 9307 | BTRFS_I(old_inode)->dir_index = 0ULL; |
33345d01 | 9308 | if (unlikely(old_ino == BTRFS_FIRST_FREE_OBJECTID)) { |
4df27c4d | 9309 | /* force full log commit if subvolume involved. */ |
995946dd | 9310 | btrfs_set_log_full_commit(root->fs_info, trans); |
4df27c4d | 9311 | } else { |
a5719521 YZ |
9312 | ret = btrfs_insert_inode_ref(trans, dest, |
9313 | new_dentry->d_name.name, | |
9314 | new_dentry->d_name.len, | |
33345d01 LZ |
9315 | old_ino, |
9316 | btrfs_ino(new_dir), index); | |
a5719521 YZ |
9317 | if (ret) |
9318 | goto out_fail; | |
4df27c4d YZ |
9319 | /* |
9320 | * this is an ugly little race, but the rename is required | |
9321 | * to make sure that if we crash, the inode is either at the | |
9322 | * old name or the new one. pinning the log transaction lets | |
9323 | * us make sure we don't allow a log commit to come in after | |
9324 | * we unlink the name but before we add the new name back in. | |
9325 | */ | |
9326 | btrfs_pin_log_trans(root); | |
9327 | } | |
5a3f23d5 | 9328 | |
0c4d2d95 JB |
9329 | inode_inc_iversion(old_dir); |
9330 | inode_inc_iversion(new_dir); | |
9331 | inode_inc_iversion(old_inode); | |
39279cc3 CM |
9332 | old_dir->i_ctime = old_dir->i_mtime = ctime; |
9333 | new_dir->i_ctime = new_dir->i_mtime = ctime; | |
9334 | old_inode->i_ctime = ctime; | |
5f39d397 | 9335 | |
12fcfd22 CM |
9336 | if (old_dentry->d_parent != new_dentry->d_parent) |
9337 | btrfs_record_unlink_dir(trans, old_dir, old_inode, 1); | |
9338 | ||
33345d01 | 9339 | if (unlikely(old_ino == BTRFS_FIRST_FREE_OBJECTID)) { |
4df27c4d YZ |
9340 | root_objectid = BTRFS_I(old_inode)->root->root_key.objectid; |
9341 | ret = btrfs_unlink_subvol(trans, root, old_dir, root_objectid, | |
9342 | old_dentry->d_name.name, | |
9343 | old_dentry->d_name.len); | |
9344 | } else { | |
92986796 | 9345 | ret = __btrfs_unlink_inode(trans, root, old_dir, |
2b0143b5 | 9346 | d_inode(old_dentry), |
92986796 AV |
9347 | old_dentry->d_name.name, |
9348 | old_dentry->d_name.len); | |
9349 | if (!ret) | |
9350 | ret = btrfs_update_inode(trans, root, old_inode); | |
4df27c4d | 9351 | } |
79787eaa JM |
9352 | if (ret) { |
9353 | btrfs_abort_transaction(trans, root, ret); | |
9354 | goto out_fail; | |
9355 | } | |
39279cc3 CM |
9356 | |
9357 | if (new_inode) { | |
0c4d2d95 | 9358 | inode_inc_iversion(new_inode); |
39279cc3 | 9359 | new_inode->i_ctime = CURRENT_TIME; |
33345d01 | 9360 | if (unlikely(btrfs_ino(new_inode) == |
4df27c4d YZ |
9361 | BTRFS_EMPTY_SUBVOL_DIR_OBJECTID)) { |
9362 | root_objectid = BTRFS_I(new_inode)->location.objectid; | |
9363 | ret = btrfs_unlink_subvol(trans, dest, new_dir, | |
9364 | root_objectid, | |
9365 | new_dentry->d_name.name, | |
9366 | new_dentry->d_name.len); | |
9367 | BUG_ON(new_inode->i_nlink == 0); | |
9368 | } else { | |
9369 | ret = btrfs_unlink_inode(trans, dest, new_dir, | |
2b0143b5 | 9370 | d_inode(new_dentry), |
4df27c4d YZ |
9371 | new_dentry->d_name.name, |
9372 | new_dentry->d_name.len); | |
9373 | } | |
4ef31a45 | 9374 | if (!ret && new_inode->i_nlink == 0) |
2b0143b5 | 9375 | ret = btrfs_orphan_add(trans, d_inode(new_dentry)); |
79787eaa JM |
9376 | if (ret) { |
9377 | btrfs_abort_transaction(trans, root, ret); | |
9378 | goto out_fail; | |
9379 | } | |
39279cc3 | 9380 | } |
aec7477b | 9381 | |
4df27c4d YZ |
9382 | ret = btrfs_add_link(trans, new_dir, old_inode, |
9383 | new_dentry->d_name.name, | |
a5719521 | 9384 | new_dentry->d_name.len, 0, index); |
79787eaa JM |
9385 | if (ret) { |
9386 | btrfs_abort_transaction(trans, root, ret); | |
9387 | goto out_fail; | |
9388 | } | |
39279cc3 | 9389 | |
67de1176 MX |
9390 | if (old_inode->i_nlink == 1) |
9391 | BTRFS_I(old_inode)->dir_index = index; | |
9392 | ||
33345d01 | 9393 | if (old_ino != BTRFS_FIRST_FREE_OBJECTID) { |
10d9f309 | 9394 | struct dentry *parent = new_dentry->d_parent; |
6a912213 | 9395 | btrfs_log_new_name(trans, old_inode, old_dir, parent); |
4df27c4d YZ |
9396 | btrfs_end_log_trans(root); |
9397 | } | |
39279cc3 | 9398 | out_fail: |
7ad85bb7 | 9399 | btrfs_end_transaction(trans, root); |
b44c59a8 | 9400 | out_notrans: |
33345d01 | 9401 | if (old_ino == BTRFS_FIRST_FREE_OBJECTID) |
76dda93c | 9402 | up_read(&root->fs_info->subvol_sem); |
9ed74f2d | 9403 | |
39279cc3 CM |
9404 | return ret; |
9405 | } | |
9406 | ||
80ace85c MS |
9407 | static int btrfs_rename2(struct inode *old_dir, struct dentry *old_dentry, |
9408 | struct inode *new_dir, struct dentry *new_dentry, | |
9409 | unsigned int flags) | |
9410 | { | |
9411 | if (flags & ~RENAME_NOREPLACE) | |
9412 | return -EINVAL; | |
9413 | ||
9414 | return btrfs_rename(old_dir, old_dentry, new_dir, new_dentry); | |
9415 | } | |
9416 | ||
8ccf6f19 MX |
9417 | static void btrfs_run_delalloc_work(struct btrfs_work *work) |
9418 | { | |
9419 | struct btrfs_delalloc_work *delalloc_work; | |
9f23e289 | 9420 | struct inode *inode; |
8ccf6f19 MX |
9421 | |
9422 | delalloc_work = container_of(work, struct btrfs_delalloc_work, | |
9423 | work); | |
9f23e289 | 9424 | inode = delalloc_work->inode; |
30424601 DS |
9425 | filemap_flush(inode->i_mapping); |
9426 | if (test_bit(BTRFS_INODE_HAS_ASYNC_EXTENT, | |
9427 | &BTRFS_I(inode)->runtime_flags)) | |
9f23e289 | 9428 | filemap_flush(inode->i_mapping); |
8ccf6f19 MX |
9429 | |
9430 | if (delalloc_work->delay_iput) | |
9f23e289 | 9431 | btrfs_add_delayed_iput(inode); |
8ccf6f19 | 9432 | else |
9f23e289 | 9433 | iput(inode); |
8ccf6f19 MX |
9434 | complete(&delalloc_work->completion); |
9435 | } | |
9436 | ||
9437 | struct btrfs_delalloc_work *btrfs_alloc_delalloc_work(struct inode *inode, | |
651d494a | 9438 | int delay_iput) |
8ccf6f19 MX |
9439 | { |
9440 | struct btrfs_delalloc_work *work; | |
9441 | ||
100d5702 | 9442 | work = kmalloc(sizeof(*work), GFP_NOFS); |
8ccf6f19 MX |
9443 | if (!work) |
9444 | return NULL; | |
9445 | ||
9446 | init_completion(&work->completion); | |
9447 | INIT_LIST_HEAD(&work->list); | |
9448 | work->inode = inode; | |
8ccf6f19 | 9449 | work->delay_iput = delay_iput; |
9e0af237 LB |
9450 | WARN_ON_ONCE(!inode); |
9451 | btrfs_init_work(&work->work, btrfs_flush_delalloc_helper, | |
9452 | btrfs_run_delalloc_work, NULL, NULL); | |
8ccf6f19 MX |
9453 | |
9454 | return work; | |
9455 | } | |
9456 | ||
9457 | void btrfs_wait_and_free_delalloc_work(struct btrfs_delalloc_work *work) | |
9458 | { | |
9459 | wait_for_completion(&work->completion); | |
100d5702 | 9460 | kfree(work); |
8ccf6f19 MX |
9461 | } |
9462 | ||
d352ac68 CM |
9463 | /* |
9464 | * some fairly slow code that needs optimization. This walks the list | |
9465 | * of all the inodes with pending delalloc and forces them to disk. | |
9466 | */ | |
6c255e67 MX |
9467 | static int __start_delalloc_inodes(struct btrfs_root *root, int delay_iput, |
9468 | int nr) | |
ea8c2819 | 9469 | { |
ea8c2819 | 9470 | struct btrfs_inode *binode; |
5b21f2ed | 9471 | struct inode *inode; |
8ccf6f19 MX |
9472 | struct btrfs_delalloc_work *work, *next; |
9473 | struct list_head works; | |
1eafa6c7 | 9474 | struct list_head splice; |
8ccf6f19 | 9475 | int ret = 0; |
ea8c2819 | 9476 | |
8ccf6f19 | 9477 | INIT_LIST_HEAD(&works); |
1eafa6c7 | 9478 | INIT_LIST_HEAD(&splice); |
63607cc8 | 9479 | |
573bfb72 | 9480 | mutex_lock(&root->delalloc_mutex); |
eb73c1b7 MX |
9481 | spin_lock(&root->delalloc_lock); |
9482 | list_splice_init(&root->delalloc_inodes, &splice); | |
1eafa6c7 MX |
9483 | while (!list_empty(&splice)) { |
9484 | binode = list_entry(splice.next, struct btrfs_inode, | |
ea8c2819 | 9485 | delalloc_inodes); |
1eafa6c7 | 9486 | |
eb73c1b7 MX |
9487 | list_move_tail(&binode->delalloc_inodes, |
9488 | &root->delalloc_inodes); | |
5b21f2ed | 9489 | inode = igrab(&binode->vfs_inode); |
df0af1a5 | 9490 | if (!inode) { |
eb73c1b7 | 9491 | cond_resched_lock(&root->delalloc_lock); |
1eafa6c7 | 9492 | continue; |
df0af1a5 | 9493 | } |
eb73c1b7 | 9494 | spin_unlock(&root->delalloc_lock); |
1eafa6c7 | 9495 | |
651d494a | 9496 | work = btrfs_alloc_delalloc_work(inode, delay_iput); |
5d99a998 | 9497 | if (!work) { |
f4ab9ea7 JB |
9498 | if (delay_iput) |
9499 | btrfs_add_delayed_iput(inode); | |
9500 | else | |
9501 | iput(inode); | |
1eafa6c7 | 9502 | ret = -ENOMEM; |
a1ecaabb | 9503 | goto out; |
5b21f2ed | 9504 | } |
1eafa6c7 | 9505 | list_add_tail(&work->list, &works); |
a44903ab QW |
9506 | btrfs_queue_work(root->fs_info->flush_workers, |
9507 | &work->work); | |
6c255e67 MX |
9508 | ret++; |
9509 | if (nr != -1 && ret >= nr) | |
a1ecaabb | 9510 | goto out; |
5b21f2ed | 9511 | cond_resched(); |
eb73c1b7 | 9512 | spin_lock(&root->delalloc_lock); |
ea8c2819 | 9513 | } |
eb73c1b7 | 9514 | spin_unlock(&root->delalloc_lock); |
8c8bee1d | 9515 | |
a1ecaabb | 9516 | out: |
eb73c1b7 MX |
9517 | list_for_each_entry_safe(work, next, &works, list) { |
9518 | list_del_init(&work->list); | |
9519 | btrfs_wait_and_free_delalloc_work(work); | |
9520 | } | |
9521 | ||
9522 | if (!list_empty_careful(&splice)) { | |
9523 | spin_lock(&root->delalloc_lock); | |
9524 | list_splice_tail(&splice, &root->delalloc_inodes); | |
9525 | spin_unlock(&root->delalloc_lock); | |
9526 | } | |
573bfb72 | 9527 | mutex_unlock(&root->delalloc_mutex); |
eb73c1b7 MX |
9528 | return ret; |
9529 | } | |
1eafa6c7 | 9530 | |
eb73c1b7 MX |
9531 | int btrfs_start_delalloc_inodes(struct btrfs_root *root, int delay_iput) |
9532 | { | |
9533 | int ret; | |
1eafa6c7 | 9534 | |
2c21b4d7 | 9535 | if (test_bit(BTRFS_FS_STATE_ERROR, &root->fs_info->fs_state)) |
eb73c1b7 MX |
9536 | return -EROFS; |
9537 | ||
6c255e67 MX |
9538 | ret = __start_delalloc_inodes(root, delay_iput, -1); |
9539 | if (ret > 0) | |
9540 | ret = 0; | |
eb73c1b7 MX |
9541 | /* |
9542 | * the filemap_flush will queue IO into the worker threads, but | |
8c8bee1d CM |
9543 | * we have to make sure the IO is actually started and that |
9544 | * ordered extents get created before we return | |
9545 | */ | |
9546 | atomic_inc(&root->fs_info->async_submit_draining); | |
d397712b | 9547 | while (atomic_read(&root->fs_info->nr_async_submits) || |
771ed689 | 9548 | atomic_read(&root->fs_info->async_delalloc_pages)) { |
8c8bee1d | 9549 | wait_event(root->fs_info->async_submit_wait, |
771ed689 CM |
9550 | (atomic_read(&root->fs_info->nr_async_submits) == 0 && |
9551 | atomic_read(&root->fs_info->async_delalloc_pages) == 0)); | |
8c8bee1d CM |
9552 | } |
9553 | atomic_dec(&root->fs_info->async_submit_draining); | |
eb73c1b7 MX |
9554 | return ret; |
9555 | } | |
9556 | ||
6c255e67 MX |
9557 | int btrfs_start_delalloc_roots(struct btrfs_fs_info *fs_info, int delay_iput, |
9558 | int nr) | |
eb73c1b7 MX |
9559 | { |
9560 | struct btrfs_root *root; | |
9561 | struct list_head splice; | |
9562 | int ret; | |
9563 | ||
2c21b4d7 | 9564 | if (test_bit(BTRFS_FS_STATE_ERROR, &fs_info->fs_state)) |
eb73c1b7 MX |
9565 | return -EROFS; |
9566 | ||
9567 | INIT_LIST_HEAD(&splice); | |
9568 | ||
573bfb72 | 9569 | mutex_lock(&fs_info->delalloc_root_mutex); |
eb73c1b7 MX |
9570 | spin_lock(&fs_info->delalloc_root_lock); |
9571 | list_splice_init(&fs_info->delalloc_roots, &splice); | |
6c255e67 | 9572 | while (!list_empty(&splice) && nr) { |
eb73c1b7 MX |
9573 | root = list_first_entry(&splice, struct btrfs_root, |
9574 | delalloc_root); | |
9575 | root = btrfs_grab_fs_root(root); | |
9576 | BUG_ON(!root); | |
9577 | list_move_tail(&root->delalloc_root, | |
9578 | &fs_info->delalloc_roots); | |
9579 | spin_unlock(&fs_info->delalloc_root_lock); | |
9580 | ||
6c255e67 | 9581 | ret = __start_delalloc_inodes(root, delay_iput, nr); |
eb73c1b7 | 9582 | btrfs_put_fs_root(root); |
6c255e67 | 9583 | if (ret < 0) |
eb73c1b7 MX |
9584 | goto out; |
9585 | ||
6c255e67 MX |
9586 | if (nr != -1) { |
9587 | nr -= ret; | |
9588 | WARN_ON(nr < 0); | |
9589 | } | |
eb73c1b7 | 9590 | spin_lock(&fs_info->delalloc_root_lock); |
8ccf6f19 | 9591 | } |
eb73c1b7 | 9592 | spin_unlock(&fs_info->delalloc_root_lock); |
1eafa6c7 | 9593 | |
6c255e67 | 9594 | ret = 0; |
eb73c1b7 MX |
9595 | atomic_inc(&fs_info->async_submit_draining); |
9596 | while (atomic_read(&fs_info->nr_async_submits) || | |
9597 | atomic_read(&fs_info->async_delalloc_pages)) { | |
9598 | wait_event(fs_info->async_submit_wait, | |
9599 | (atomic_read(&fs_info->nr_async_submits) == 0 && | |
9600 | atomic_read(&fs_info->async_delalloc_pages) == 0)); | |
9601 | } | |
9602 | atomic_dec(&fs_info->async_submit_draining); | |
eb73c1b7 | 9603 | out: |
1eafa6c7 | 9604 | if (!list_empty_careful(&splice)) { |
eb73c1b7 MX |
9605 | spin_lock(&fs_info->delalloc_root_lock); |
9606 | list_splice_tail(&splice, &fs_info->delalloc_roots); | |
9607 | spin_unlock(&fs_info->delalloc_root_lock); | |
1eafa6c7 | 9608 | } |
573bfb72 | 9609 | mutex_unlock(&fs_info->delalloc_root_mutex); |
8ccf6f19 | 9610 | return ret; |
ea8c2819 CM |
9611 | } |
9612 | ||
39279cc3 CM |
9613 | static int btrfs_symlink(struct inode *dir, struct dentry *dentry, |
9614 | const char *symname) | |
9615 | { | |
9616 | struct btrfs_trans_handle *trans; | |
9617 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
9618 | struct btrfs_path *path; | |
9619 | struct btrfs_key key; | |
1832a6d5 | 9620 | struct inode *inode = NULL; |
39279cc3 CM |
9621 | int err; |
9622 | int drop_inode = 0; | |
9623 | u64 objectid; | |
67871254 | 9624 | u64 index = 0; |
39279cc3 CM |
9625 | int name_len; |
9626 | int datasize; | |
5f39d397 | 9627 | unsigned long ptr; |
39279cc3 | 9628 | struct btrfs_file_extent_item *ei; |
5f39d397 | 9629 | struct extent_buffer *leaf; |
39279cc3 | 9630 | |
f06becc4 | 9631 | name_len = strlen(symname); |
39279cc3 CM |
9632 | if (name_len > BTRFS_MAX_INLINE_DATA_SIZE(root)) |
9633 | return -ENAMETOOLONG; | |
1832a6d5 | 9634 | |
9ed74f2d JB |
9635 | /* |
9636 | * 2 items for inode item and ref | |
9637 | * 2 items for dir items | |
9269d12b FM |
9638 | * 1 item for updating parent inode item |
9639 | * 1 item for the inline extent item | |
9ed74f2d JB |
9640 | * 1 item for xattr if selinux is on |
9641 | */ | |
9269d12b | 9642 | trans = btrfs_start_transaction(root, 7); |
a22285a6 YZ |
9643 | if (IS_ERR(trans)) |
9644 | return PTR_ERR(trans); | |
1832a6d5 | 9645 | |
581bb050 LZ |
9646 | err = btrfs_find_free_ino(root, &objectid); |
9647 | if (err) | |
9648 | goto out_unlock; | |
9649 | ||
aec7477b | 9650 | inode = btrfs_new_inode(trans, root, dir, dentry->d_name.name, |
33345d01 | 9651 | dentry->d_name.len, btrfs_ino(dir), objectid, |
d82a6f1d | 9652 | S_IFLNK|S_IRWXUGO, &index); |
7cf96da3 TI |
9653 | if (IS_ERR(inode)) { |
9654 | err = PTR_ERR(inode); | |
39279cc3 | 9655 | goto out_unlock; |
7cf96da3 | 9656 | } |
39279cc3 | 9657 | |
ad19db71 CS |
9658 | /* |
9659 | * If the active LSM wants to access the inode during | |
9660 | * d_instantiate it needs these. Smack checks to see | |
9661 | * if the filesystem supports xattrs by looking at the | |
9662 | * ops vector. | |
9663 | */ | |
9664 | inode->i_fop = &btrfs_file_operations; | |
9665 | inode->i_op = &btrfs_file_inode_operations; | |
b0d5d10f | 9666 | inode->i_mapping->a_ops = &btrfs_aops; |
b0d5d10f CM |
9667 | BTRFS_I(inode)->io_tree.ops = &btrfs_extent_io_ops; |
9668 | ||
9669 | err = btrfs_init_inode_security(trans, inode, dir, &dentry->d_name); | |
9670 | if (err) | |
9671 | goto out_unlock_inode; | |
ad19db71 | 9672 | |
39279cc3 | 9673 | path = btrfs_alloc_path(); |
d8926bb3 MF |
9674 | if (!path) { |
9675 | err = -ENOMEM; | |
b0d5d10f | 9676 | goto out_unlock_inode; |
d8926bb3 | 9677 | } |
33345d01 | 9678 | key.objectid = btrfs_ino(inode); |
39279cc3 | 9679 | key.offset = 0; |
962a298f | 9680 | key.type = BTRFS_EXTENT_DATA_KEY; |
39279cc3 CM |
9681 | datasize = btrfs_file_extent_calc_inline_size(name_len); |
9682 | err = btrfs_insert_empty_item(trans, root, path, &key, | |
9683 | datasize); | |
54aa1f4d | 9684 | if (err) { |
b0839166 | 9685 | btrfs_free_path(path); |
b0d5d10f | 9686 | goto out_unlock_inode; |
54aa1f4d | 9687 | } |
5f39d397 CM |
9688 | leaf = path->nodes[0]; |
9689 | ei = btrfs_item_ptr(leaf, path->slots[0], | |
9690 | struct btrfs_file_extent_item); | |
9691 | btrfs_set_file_extent_generation(leaf, ei, trans->transid); | |
9692 | btrfs_set_file_extent_type(leaf, ei, | |
39279cc3 | 9693 | BTRFS_FILE_EXTENT_INLINE); |
c8b97818 CM |
9694 | btrfs_set_file_extent_encryption(leaf, ei, 0); |
9695 | btrfs_set_file_extent_compression(leaf, ei, 0); | |
9696 | btrfs_set_file_extent_other_encoding(leaf, ei, 0); | |
9697 | btrfs_set_file_extent_ram_bytes(leaf, ei, name_len); | |
9698 | ||
39279cc3 | 9699 | ptr = btrfs_file_extent_inline_start(ei); |
5f39d397 CM |
9700 | write_extent_buffer(leaf, symname, ptr, name_len); |
9701 | btrfs_mark_buffer_dirty(leaf); | |
39279cc3 | 9702 | btrfs_free_path(path); |
5f39d397 | 9703 | |
39279cc3 CM |
9704 | inode->i_op = &btrfs_symlink_inode_operations; |
9705 | inode->i_mapping->a_ops = &btrfs_symlink_aops; | |
d899e052 | 9706 | inode_set_bytes(inode, name_len); |
f06becc4 | 9707 | btrfs_i_size_write(inode, name_len); |
54aa1f4d | 9708 | err = btrfs_update_inode(trans, root, inode); |
d50866d0 FM |
9709 | /* |
9710 | * Last step, add directory indexes for our symlink inode. This is the | |
9711 | * last step to avoid extra cleanup of these indexes if an error happens | |
9712 | * elsewhere above. | |
9713 | */ | |
9714 | if (!err) | |
9715 | err = btrfs_add_nondir(trans, dir, dentry, inode, 0, index); | |
b0d5d10f | 9716 | if (err) { |
54aa1f4d | 9717 | drop_inode = 1; |
b0d5d10f CM |
9718 | goto out_unlock_inode; |
9719 | } | |
9720 | ||
9721 | unlock_new_inode(inode); | |
9722 | d_instantiate(dentry, inode); | |
39279cc3 CM |
9723 | |
9724 | out_unlock: | |
7ad85bb7 | 9725 | btrfs_end_transaction(trans, root); |
39279cc3 CM |
9726 | if (drop_inode) { |
9727 | inode_dec_link_count(inode); | |
9728 | iput(inode); | |
9729 | } | |
b53d3f5d | 9730 | btrfs_btree_balance_dirty(root); |
39279cc3 | 9731 | return err; |
b0d5d10f CM |
9732 | |
9733 | out_unlock_inode: | |
9734 | drop_inode = 1; | |
9735 | unlock_new_inode(inode); | |
9736 | goto out_unlock; | |
39279cc3 | 9737 | } |
16432985 | 9738 | |
0af3d00b JB |
9739 | static int __btrfs_prealloc_file_range(struct inode *inode, int mode, |
9740 | u64 start, u64 num_bytes, u64 min_size, | |
9741 | loff_t actual_len, u64 *alloc_hint, | |
9742 | struct btrfs_trans_handle *trans) | |
d899e052 | 9743 | { |
5dc562c5 JB |
9744 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; |
9745 | struct extent_map *em; | |
d899e052 YZ |
9746 | struct btrfs_root *root = BTRFS_I(inode)->root; |
9747 | struct btrfs_key ins; | |
d899e052 | 9748 | u64 cur_offset = start; |
55a61d1d | 9749 | u64 i_size; |
154ea289 | 9750 | u64 cur_bytes; |
0b670dc4 | 9751 | u64 last_alloc = (u64)-1; |
d899e052 | 9752 | int ret = 0; |
0af3d00b | 9753 | bool own_trans = true; |
d899e052 | 9754 | |
0af3d00b JB |
9755 | if (trans) |
9756 | own_trans = false; | |
d899e052 | 9757 | while (num_bytes > 0) { |
0af3d00b JB |
9758 | if (own_trans) { |
9759 | trans = btrfs_start_transaction(root, 3); | |
9760 | if (IS_ERR(trans)) { | |
9761 | ret = PTR_ERR(trans); | |
9762 | break; | |
9763 | } | |
5a303d5d YZ |
9764 | } |
9765 | ||
ee22184b | 9766 | cur_bytes = min_t(u64, num_bytes, SZ_256M); |
154ea289 | 9767 | cur_bytes = max(cur_bytes, min_size); |
0b670dc4 JB |
9768 | /* |
9769 | * If we are severely fragmented we could end up with really | |
9770 | * small allocations, so if the allocator is returning small | |
9771 | * chunks lets make its job easier by only searching for those | |
9772 | * sized chunks. | |
9773 | */ | |
9774 | cur_bytes = min(cur_bytes, last_alloc); | |
00361589 | 9775 | ret = btrfs_reserve_extent(root, cur_bytes, min_size, 0, |
e570fd27 | 9776 | *alloc_hint, &ins, 1, 0); |
5a303d5d | 9777 | if (ret) { |
0af3d00b JB |
9778 | if (own_trans) |
9779 | btrfs_end_transaction(trans, root); | |
a22285a6 | 9780 | break; |
d899e052 | 9781 | } |
5a303d5d | 9782 | |
0b670dc4 | 9783 | last_alloc = ins.offset; |
d899e052 YZ |
9784 | ret = insert_reserved_file_extent(trans, inode, |
9785 | cur_offset, ins.objectid, | |
9786 | ins.offset, ins.offset, | |
920bbbfb | 9787 | ins.offset, 0, 0, 0, |
d899e052 | 9788 | BTRFS_FILE_EXTENT_PREALLOC); |
79787eaa | 9789 | if (ret) { |
857cc2fc | 9790 | btrfs_free_reserved_extent(root, ins.objectid, |
e570fd27 | 9791 | ins.offset, 0); |
79787eaa JM |
9792 | btrfs_abort_transaction(trans, root, ret); |
9793 | if (own_trans) | |
9794 | btrfs_end_transaction(trans, root); | |
9795 | break; | |
9796 | } | |
31193213 | 9797 | |
a1ed835e CM |
9798 | btrfs_drop_extent_cache(inode, cur_offset, |
9799 | cur_offset + ins.offset -1, 0); | |
5a303d5d | 9800 | |
5dc562c5 JB |
9801 | em = alloc_extent_map(); |
9802 | if (!em) { | |
9803 | set_bit(BTRFS_INODE_NEEDS_FULL_SYNC, | |
9804 | &BTRFS_I(inode)->runtime_flags); | |
9805 | goto next; | |
9806 | } | |
9807 | ||
9808 | em->start = cur_offset; | |
9809 | em->orig_start = cur_offset; | |
9810 | em->len = ins.offset; | |
9811 | em->block_start = ins.objectid; | |
9812 | em->block_len = ins.offset; | |
b4939680 | 9813 | em->orig_block_len = ins.offset; |
cc95bef6 | 9814 | em->ram_bytes = ins.offset; |
5dc562c5 JB |
9815 | em->bdev = root->fs_info->fs_devices->latest_bdev; |
9816 | set_bit(EXTENT_FLAG_PREALLOC, &em->flags); | |
9817 | em->generation = trans->transid; | |
9818 | ||
9819 | while (1) { | |
9820 | write_lock(&em_tree->lock); | |
09a2a8f9 | 9821 | ret = add_extent_mapping(em_tree, em, 1); |
5dc562c5 JB |
9822 | write_unlock(&em_tree->lock); |
9823 | if (ret != -EEXIST) | |
9824 | break; | |
9825 | btrfs_drop_extent_cache(inode, cur_offset, | |
9826 | cur_offset + ins.offset - 1, | |
9827 | 0); | |
9828 | } | |
9829 | free_extent_map(em); | |
9830 | next: | |
d899e052 YZ |
9831 | num_bytes -= ins.offset; |
9832 | cur_offset += ins.offset; | |
efa56464 | 9833 | *alloc_hint = ins.objectid + ins.offset; |
5a303d5d | 9834 | |
0c4d2d95 | 9835 | inode_inc_iversion(inode); |
d899e052 | 9836 | inode->i_ctime = CURRENT_TIME; |
6cbff00f | 9837 | BTRFS_I(inode)->flags |= BTRFS_INODE_PREALLOC; |
d899e052 | 9838 | if (!(mode & FALLOC_FL_KEEP_SIZE) && |
efa56464 YZ |
9839 | (actual_len > inode->i_size) && |
9840 | (cur_offset > inode->i_size)) { | |
d1ea6a61 | 9841 | if (cur_offset > actual_len) |
55a61d1d | 9842 | i_size = actual_len; |
d1ea6a61 | 9843 | else |
55a61d1d JB |
9844 | i_size = cur_offset; |
9845 | i_size_write(inode, i_size); | |
9846 | btrfs_ordered_update_i_size(inode, i_size, NULL); | |
5a303d5d YZ |
9847 | } |
9848 | ||
d899e052 | 9849 | ret = btrfs_update_inode(trans, root, inode); |
79787eaa JM |
9850 | |
9851 | if (ret) { | |
9852 | btrfs_abort_transaction(trans, root, ret); | |
9853 | if (own_trans) | |
9854 | btrfs_end_transaction(trans, root); | |
9855 | break; | |
9856 | } | |
d899e052 | 9857 | |
0af3d00b JB |
9858 | if (own_trans) |
9859 | btrfs_end_transaction(trans, root); | |
5a303d5d | 9860 | } |
d899e052 YZ |
9861 | return ret; |
9862 | } | |
9863 | ||
0af3d00b JB |
9864 | int btrfs_prealloc_file_range(struct inode *inode, int mode, |
9865 | u64 start, u64 num_bytes, u64 min_size, | |
9866 | loff_t actual_len, u64 *alloc_hint) | |
9867 | { | |
9868 | return __btrfs_prealloc_file_range(inode, mode, start, num_bytes, | |
9869 | min_size, actual_len, alloc_hint, | |
9870 | NULL); | |
9871 | } | |
9872 | ||
9873 | int btrfs_prealloc_file_range_trans(struct inode *inode, | |
9874 | struct btrfs_trans_handle *trans, int mode, | |
9875 | u64 start, u64 num_bytes, u64 min_size, | |
9876 | loff_t actual_len, u64 *alloc_hint) | |
9877 | { | |
9878 | return __btrfs_prealloc_file_range(inode, mode, start, num_bytes, | |
9879 | min_size, actual_len, alloc_hint, trans); | |
9880 | } | |
9881 | ||
e6dcd2dc CM |
9882 | static int btrfs_set_page_dirty(struct page *page) |
9883 | { | |
e6dcd2dc CM |
9884 | return __set_page_dirty_nobuffers(page); |
9885 | } | |
9886 | ||
10556cb2 | 9887 | static int btrfs_permission(struct inode *inode, int mask) |
fdebe2bd | 9888 | { |
b83cc969 | 9889 | struct btrfs_root *root = BTRFS_I(inode)->root; |
cb6db4e5 | 9890 | umode_t mode = inode->i_mode; |
b83cc969 | 9891 | |
cb6db4e5 JM |
9892 | if (mask & MAY_WRITE && |
9893 | (S_ISREG(mode) || S_ISDIR(mode) || S_ISLNK(mode))) { | |
9894 | if (btrfs_root_readonly(root)) | |
9895 | return -EROFS; | |
9896 | if (BTRFS_I(inode)->flags & BTRFS_INODE_READONLY) | |
9897 | return -EACCES; | |
9898 | } | |
2830ba7f | 9899 | return generic_permission(inode, mask); |
fdebe2bd | 9900 | } |
39279cc3 | 9901 | |
ef3b9af5 FM |
9902 | static int btrfs_tmpfile(struct inode *dir, struct dentry *dentry, umode_t mode) |
9903 | { | |
9904 | struct btrfs_trans_handle *trans; | |
9905 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
9906 | struct inode *inode = NULL; | |
9907 | u64 objectid; | |
9908 | u64 index; | |
9909 | int ret = 0; | |
9910 | ||
9911 | /* | |
9912 | * 5 units required for adding orphan entry | |
9913 | */ | |
9914 | trans = btrfs_start_transaction(root, 5); | |
9915 | if (IS_ERR(trans)) | |
9916 | return PTR_ERR(trans); | |
9917 | ||
9918 | ret = btrfs_find_free_ino(root, &objectid); | |
9919 | if (ret) | |
9920 | goto out; | |
9921 | ||
9922 | inode = btrfs_new_inode(trans, root, dir, NULL, 0, | |
9923 | btrfs_ino(dir), objectid, mode, &index); | |
9924 | if (IS_ERR(inode)) { | |
9925 | ret = PTR_ERR(inode); | |
9926 | inode = NULL; | |
9927 | goto out; | |
9928 | } | |
9929 | ||
ef3b9af5 FM |
9930 | inode->i_fop = &btrfs_file_operations; |
9931 | inode->i_op = &btrfs_file_inode_operations; | |
9932 | ||
9933 | inode->i_mapping->a_ops = &btrfs_aops; | |
ef3b9af5 FM |
9934 | BTRFS_I(inode)->io_tree.ops = &btrfs_extent_io_ops; |
9935 | ||
b0d5d10f CM |
9936 | ret = btrfs_init_inode_security(trans, inode, dir, NULL); |
9937 | if (ret) | |
9938 | goto out_inode; | |
9939 | ||
9940 | ret = btrfs_update_inode(trans, root, inode); | |
9941 | if (ret) | |
9942 | goto out_inode; | |
ef3b9af5 FM |
9943 | ret = btrfs_orphan_add(trans, inode); |
9944 | if (ret) | |
b0d5d10f | 9945 | goto out_inode; |
ef3b9af5 | 9946 | |
5762b5c9 FM |
9947 | /* |
9948 | * We set number of links to 0 in btrfs_new_inode(), and here we set | |
9949 | * it to 1 because d_tmpfile() will issue a warning if the count is 0, | |
9950 | * through: | |
9951 | * | |
9952 | * d_tmpfile() -> inode_dec_link_count() -> drop_nlink() | |
9953 | */ | |
9954 | set_nlink(inode, 1); | |
b0d5d10f | 9955 | unlock_new_inode(inode); |
ef3b9af5 FM |
9956 | d_tmpfile(dentry, inode); |
9957 | mark_inode_dirty(inode); | |
9958 | ||
9959 | out: | |
9960 | btrfs_end_transaction(trans, root); | |
9961 | if (ret) | |
9962 | iput(inode); | |
9963 | btrfs_balance_delayed_items(root); | |
9964 | btrfs_btree_balance_dirty(root); | |
ef3b9af5 | 9965 | return ret; |
b0d5d10f CM |
9966 | |
9967 | out_inode: | |
9968 | unlock_new_inode(inode); | |
9969 | goto out; | |
9970 | ||
ef3b9af5 FM |
9971 | } |
9972 | ||
b38ef71c FM |
9973 | /* Inspired by filemap_check_errors() */ |
9974 | int btrfs_inode_check_errors(struct inode *inode) | |
9975 | { | |
9976 | int ret = 0; | |
9977 | ||
9978 | if (test_bit(AS_ENOSPC, &inode->i_mapping->flags) && | |
9979 | test_and_clear_bit(AS_ENOSPC, &inode->i_mapping->flags)) | |
9980 | ret = -ENOSPC; | |
9981 | if (test_bit(AS_EIO, &inode->i_mapping->flags) && | |
9982 | test_and_clear_bit(AS_EIO, &inode->i_mapping->flags)) | |
9983 | ret = -EIO; | |
9984 | ||
9985 | return ret; | |
9986 | } | |
9987 | ||
6e1d5dcc | 9988 | static const struct inode_operations btrfs_dir_inode_operations = { |
3394e160 | 9989 | .getattr = btrfs_getattr, |
39279cc3 CM |
9990 | .lookup = btrfs_lookup, |
9991 | .create = btrfs_create, | |
9992 | .unlink = btrfs_unlink, | |
9993 | .link = btrfs_link, | |
9994 | .mkdir = btrfs_mkdir, | |
9995 | .rmdir = btrfs_rmdir, | |
80ace85c | 9996 | .rename2 = btrfs_rename2, |
39279cc3 CM |
9997 | .symlink = btrfs_symlink, |
9998 | .setattr = btrfs_setattr, | |
618e21d5 | 9999 | .mknod = btrfs_mknod, |
95819c05 CH |
10000 | .setxattr = btrfs_setxattr, |
10001 | .getxattr = btrfs_getxattr, | |
5103e947 | 10002 | .listxattr = btrfs_listxattr, |
95819c05 | 10003 | .removexattr = btrfs_removexattr, |
fdebe2bd | 10004 | .permission = btrfs_permission, |
4e34e719 | 10005 | .get_acl = btrfs_get_acl, |
996a710d | 10006 | .set_acl = btrfs_set_acl, |
93fd63c2 | 10007 | .update_time = btrfs_update_time, |
ef3b9af5 | 10008 | .tmpfile = btrfs_tmpfile, |
39279cc3 | 10009 | }; |
6e1d5dcc | 10010 | static const struct inode_operations btrfs_dir_ro_inode_operations = { |
39279cc3 | 10011 | .lookup = btrfs_lookup, |
fdebe2bd | 10012 | .permission = btrfs_permission, |
4e34e719 | 10013 | .get_acl = btrfs_get_acl, |
996a710d | 10014 | .set_acl = btrfs_set_acl, |
93fd63c2 | 10015 | .update_time = btrfs_update_time, |
39279cc3 | 10016 | }; |
76dda93c | 10017 | |
828c0950 | 10018 | static const struct file_operations btrfs_dir_file_operations = { |
39279cc3 CM |
10019 | .llseek = generic_file_llseek, |
10020 | .read = generic_read_dir, | |
9cdda8d3 | 10021 | .iterate = btrfs_real_readdir, |
34287aa3 | 10022 | .unlocked_ioctl = btrfs_ioctl, |
39279cc3 | 10023 | #ifdef CONFIG_COMPAT |
34287aa3 | 10024 | .compat_ioctl = btrfs_ioctl, |
39279cc3 | 10025 | #endif |
6bf13c0c | 10026 | .release = btrfs_release_file, |
e02119d5 | 10027 | .fsync = btrfs_sync_file, |
39279cc3 CM |
10028 | }; |
10029 | ||
20e5506b | 10030 | static const struct extent_io_ops btrfs_extent_io_ops = { |
07157aac | 10031 | .fill_delalloc = run_delalloc_range, |
065631f6 | 10032 | .submit_bio_hook = btrfs_submit_bio_hook, |
239b14b3 | 10033 | .merge_bio_hook = btrfs_merge_bio_hook, |
07157aac | 10034 | .readpage_end_io_hook = btrfs_readpage_end_io_hook, |
e6dcd2dc | 10035 | .writepage_end_io_hook = btrfs_writepage_end_io_hook, |
247e743c | 10036 | .writepage_start_hook = btrfs_writepage_start_hook, |
b0c68f8b CM |
10037 | .set_bit_hook = btrfs_set_bit_hook, |
10038 | .clear_bit_hook = btrfs_clear_bit_hook, | |
9ed74f2d JB |
10039 | .merge_extent_hook = btrfs_merge_extent_hook, |
10040 | .split_extent_hook = btrfs_split_extent_hook, | |
07157aac CM |
10041 | }; |
10042 | ||
35054394 CM |
10043 | /* |
10044 | * btrfs doesn't support the bmap operation because swapfiles | |
10045 | * use bmap to make a mapping of extents in the file. They assume | |
10046 | * these extents won't change over the life of the file and they | |
10047 | * use the bmap result to do IO directly to the drive. | |
10048 | * | |
10049 | * the btrfs bmap call would return logical addresses that aren't | |
10050 | * suitable for IO and they also will change frequently as COW | |
10051 | * operations happen. So, swapfile + btrfs == corruption. | |
10052 | * | |
10053 | * For now we're avoiding this by dropping bmap. | |
10054 | */ | |
7f09410b | 10055 | static const struct address_space_operations btrfs_aops = { |
39279cc3 CM |
10056 | .readpage = btrfs_readpage, |
10057 | .writepage = btrfs_writepage, | |
b293f02e | 10058 | .writepages = btrfs_writepages, |
3ab2fb5a | 10059 | .readpages = btrfs_readpages, |
16432985 | 10060 | .direct_IO = btrfs_direct_IO, |
a52d9a80 CM |
10061 | .invalidatepage = btrfs_invalidatepage, |
10062 | .releasepage = btrfs_releasepage, | |
e6dcd2dc | 10063 | .set_page_dirty = btrfs_set_page_dirty, |
465fdd97 | 10064 | .error_remove_page = generic_error_remove_page, |
39279cc3 CM |
10065 | }; |
10066 | ||
7f09410b | 10067 | static const struct address_space_operations btrfs_symlink_aops = { |
39279cc3 CM |
10068 | .readpage = btrfs_readpage, |
10069 | .writepage = btrfs_writepage, | |
2bf5a725 CM |
10070 | .invalidatepage = btrfs_invalidatepage, |
10071 | .releasepage = btrfs_releasepage, | |
39279cc3 CM |
10072 | }; |
10073 | ||
6e1d5dcc | 10074 | static const struct inode_operations btrfs_file_inode_operations = { |
39279cc3 CM |
10075 | .getattr = btrfs_getattr, |
10076 | .setattr = btrfs_setattr, | |
95819c05 CH |
10077 | .setxattr = btrfs_setxattr, |
10078 | .getxattr = btrfs_getxattr, | |
5103e947 | 10079 | .listxattr = btrfs_listxattr, |
95819c05 | 10080 | .removexattr = btrfs_removexattr, |
fdebe2bd | 10081 | .permission = btrfs_permission, |
1506fcc8 | 10082 | .fiemap = btrfs_fiemap, |
4e34e719 | 10083 | .get_acl = btrfs_get_acl, |
996a710d | 10084 | .set_acl = btrfs_set_acl, |
e41f941a | 10085 | .update_time = btrfs_update_time, |
39279cc3 | 10086 | }; |
6e1d5dcc | 10087 | static const struct inode_operations btrfs_special_inode_operations = { |
618e21d5 JB |
10088 | .getattr = btrfs_getattr, |
10089 | .setattr = btrfs_setattr, | |
fdebe2bd | 10090 | .permission = btrfs_permission, |
95819c05 CH |
10091 | .setxattr = btrfs_setxattr, |
10092 | .getxattr = btrfs_getxattr, | |
33268eaf | 10093 | .listxattr = btrfs_listxattr, |
95819c05 | 10094 | .removexattr = btrfs_removexattr, |
4e34e719 | 10095 | .get_acl = btrfs_get_acl, |
996a710d | 10096 | .set_acl = btrfs_set_acl, |
e41f941a | 10097 | .update_time = btrfs_update_time, |
618e21d5 | 10098 | }; |
6e1d5dcc | 10099 | static const struct inode_operations btrfs_symlink_inode_operations = { |
39279cc3 CM |
10100 | .readlink = generic_readlink, |
10101 | .follow_link = page_follow_link_light, | |
10102 | .put_link = page_put_link, | |
f209561a | 10103 | .getattr = btrfs_getattr, |
22c44fe6 | 10104 | .setattr = btrfs_setattr, |
fdebe2bd | 10105 | .permission = btrfs_permission, |
0279b4cd JO |
10106 | .setxattr = btrfs_setxattr, |
10107 | .getxattr = btrfs_getxattr, | |
10108 | .listxattr = btrfs_listxattr, | |
10109 | .removexattr = btrfs_removexattr, | |
e41f941a | 10110 | .update_time = btrfs_update_time, |
39279cc3 | 10111 | }; |
76dda93c | 10112 | |
82d339d9 | 10113 | const struct dentry_operations btrfs_dentry_operations = { |
76dda93c | 10114 | .d_delete = btrfs_dentry_delete, |
b4aff1f8 | 10115 | .d_release = btrfs_dentry_release, |
76dda93c | 10116 | }; |