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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 | ||
6e1d5dcc AD |
69 | static const struct inode_operations btrfs_dir_inode_operations; |
70 | static const struct inode_operations btrfs_symlink_inode_operations; | |
71 | static const struct inode_operations btrfs_dir_ro_inode_operations; | |
72 | static const struct inode_operations btrfs_special_inode_operations; | |
73 | static const struct inode_operations btrfs_file_inode_operations; | |
7f09410b AD |
74 | static const struct address_space_operations btrfs_aops; |
75 | static const struct address_space_operations btrfs_symlink_aops; | |
828c0950 | 76 | static const struct file_operations btrfs_dir_file_operations; |
d1310b2e | 77 | static struct extent_io_ops btrfs_extent_io_ops; |
39279cc3 CM |
78 | |
79 | static struct kmem_cache *btrfs_inode_cachep; | |
8ccf6f19 | 80 | static struct kmem_cache *btrfs_delalloc_work_cachep; |
39279cc3 CM |
81 | struct kmem_cache *btrfs_trans_handle_cachep; |
82 | struct kmem_cache *btrfs_transaction_cachep; | |
39279cc3 | 83 | struct kmem_cache *btrfs_path_cachep; |
dc89e982 | 84 | struct kmem_cache *btrfs_free_space_cachep; |
39279cc3 CM |
85 | |
86 | #define S_SHIFT 12 | |
87 | static unsigned char btrfs_type_by_mode[S_IFMT >> S_SHIFT] = { | |
88 | [S_IFREG >> S_SHIFT] = BTRFS_FT_REG_FILE, | |
89 | [S_IFDIR >> S_SHIFT] = BTRFS_FT_DIR, | |
90 | [S_IFCHR >> S_SHIFT] = BTRFS_FT_CHRDEV, | |
91 | [S_IFBLK >> S_SHIFT] = BTRFS_FT_BLKDEV, | |
92 | [S_IFIFO >> S_SHIFT] = BTRFS_FT_FIFO, | |
93 | [S_IFSOCK >> S_SHIFT] = BTRFS_FT_SOCK, | |
94 | [S_IFLNK >> S_SHIFT] = BTRFS_FT_SYMLINK, | |
95 | }; | |
96 | ||
3972f260 | 97 | static int btrfs_setsize(struct inode *inode, struct iattr *attr); |
a41ad394 | 98 | static int btrfs_truncate(struct inode *inode); |
5fd02043 | 99 | static int btrfs_finish_ordered_io(struct btrfs_ordered_extent *ordered_extent); |
771ed689 CM |
100 | static noinline int cow_file_range(struct inode *inode, |
101 | struct page *locked_page, | |
102 | u64 start, u64 end, int *page_started, | |
103 | unsigned long *nr_written, int unlock); | |
70c8a91c JB |
104 | static struct extent_map *create_pinned_em(struct inode *inode, u64 start, |
105 | u64 len, u64 orig_start, | |
106 | u64 block_start, u64 block_len, | |
cc95bef6 JB |
107 | u64 orig_block_len, u64 ram_bytes, |
108 | int type); | |
7b128766 | 109 | |
48a3b636 | 110 | static int btrfs_dirty_inode(struct inode *inode); |
7b128766 | 111 | |
6a3891c5 JB |
112 | #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS |
113 | void btrfs_test_inode_set_ops(struct inode *inode) | |
114 | { | |
115 | BTRFS_I(inode)->io_tree.ops = &btrfs_extent_io_ops; | |
116 | } | |
117 | #endif | |
118 | ||
f34f57a3 | 119 | static int btrfs_init_inode_security(struct btrfs_trans_handle *trans, |
2a7dba39 EP |
120 | struct inode *inode, struct inode *dir, |
121 | const struct qstr *qstr) | |
0279b4cd JO |
122 | { |
123 | int err; | |
124 | ||
f34f57a3 | 125 | err = btrfs_init_acl(trans, inode, dir); |
0279b4cd | 126 | if (!err) |
2a7dba39 | 127 | err = btrfs_xattr_security_init(trans, inode, dir, qstr); |
0279b4cd JO |
128 | return err; |
129 | } | |
130 | ||
c8b97818 CM |
131 | /* |
132 | * this does all the hard work for inserting an inline extent into | |
133 | * the btree. The caller should have done a btrfs_drop_extents so that | |
134 | * no overlapping inline items exist in the btree | |
135 | */ | |
40f76580 | 136 | static int insert_inline_extent(struct btrfs_trans_handle *trans, |
1acae57b | 137 | struct btrfs_path *path, int extent_inserted, |
c8b97818 CM |
138 | struct btrfs_root *root, struct inode *inode, |
139 | u64 start, size_t size, size_t compressed_size, | |
fe3f566c | 140 | int compress_type, |
c8b97818 CM |
141 | struct page **compressed_pages) |
142 | { | |
c8b97818 CM |
143 | struct extent_buffer *leaf; |
144 | struct page *page = NULL; | |
145 | char *kaddr; | |
146 | unsigned long ptr; | |
147 | struct btrfs_file_extent_item *ei; | |
148 | int err = 0; | |
149 | int ret; | |
150 | size_t cur_size = size; | |
c8b97818 | 151 | unsigned long offset; |
c8b97818 | 152 | |
fe3f566c | 153 | if (compressed_size && compressed_pages) |
c8b97818 | 154 | cur_size = compressed_size; |
c8b97818 | 155 | |
1acae57b | 156 | inode_add_bytes(inode, size); |
c8b97818 | 157 | |
1acae57b FDBM |
158 | if (!extent_inserted) { |
159 | struct btrfs_key key; | |
160 | size_t datasize; | |
c8b97818 | 161 | |
1acae57b FDBM |
162 | key.objectid = btrfs_ino(inode); |
163 | key.offset = start; | |
962a298f | 164 | key.type = BTRFS_EXTENT_DATA_KEY; |
c8b97818 | 165 | |
1acae57b FDBM |
166 | datasize = btrfs_file_extent_calc_inline_size(cur_size); |
167 | path->leave_spinning = 1; | |
168 | ret = btrfs_insert_empty_item(trans, root, path, &key, | |
169 | datasize); | |
170 | if (ret) { | |
171 | err = ret; | |
172 | goto fail; | |
173 | } | |
c8b97818 CM |
174 | } |
175 | leaf = path->nodes[0]; | |
176 | ei = btrfs_item_ptr(leaf, path->slots[0], | |
177 | struct btrfs_file_extent_item); | |
178 | btrfs_set_file_extent_generation(leaf, ei, trans->transid); | |
179 | btrfs_set_file_extent_type(leaf, ei, BTRFS_FILE_EXTENT_INLINE); | |
180 | btrfs_set_file_extent_encryption(leaf, ei, 0); | |
181 | btrfs_set_file_extent_other_encoding(leaf, ei, 0); | |
182 | btrfs_set_file_extent_ram_bytes(leaf, ei, size); | |
183 | ptr = btrfs_file_extent_inline_start(ei); | |
184 | ||
261507a0 | 185 | if (compress_type != BTRFS_COMPRESS_NONE) { |
c8b97818 CM |
186 | struct page *cpage; |
187 | int i = 0; | |
d397712b | 188 | while (compressed_size > 0) { |
c8b97818 | 189 | cpage = compressed_pages[i]; |
5b050f04 | 190 | cur_size = min_t(unsigned long, compressed_size, |
c8b97818 CM |
191 | PAGE_CACHE_SIZE); |
192 | ||
7ac687d9 | 193 | kaddr = kmap_atomic(cpage); |
c8b97818 | 194 | write_extent_buffer(leaf, kaddr, ptr, cur_size); |
7ac687d9 | 195 | kunmap_atomic(kaddr); |
c8b97818 CM |
196 | |
197 | i++; | |
198 | ptr += cur_size; | |
199 | compressed_size -= cur_size; | |
200 | } | |
201 | btrfs_set_file_extent_compression(leaf, ei, | |
261507a0 | 202 | compress_type); |
c8b97818 CM |
203 | } else { |
204 | page = find_get_page(inode->i_mapping, | |
205 | start >> PAGE_CACHE_SHIFT); | |
206 | btrfs_set_file_extent_compression(leaf, ei, 0); | |
7ac687d9 | 207 | kaddr = kmap_atomic(page); |
c8b97818 CM |
208 | offset = start & (PAGE_CACHE_SIZE - 1); |
209 | write_extent_buffer(leaf, kaddr + offset, ptr, size); | |
7ac687d9 | 210 | kunmap_atomic(kaddr); |
c8b97818 CM |
211 | page_cache_release(page); |
212 | } | |
213 | btrfs_mark_buffer_dirty(leaf); | |
1acae57b | 214 | btrfs_release_path(path); |
c8b97818 | 215 | |
c2167754 YZ |
216 | /* |
217 | * we're an inline extent, so nobody can | |
218 | * extend the file past i_size without locking | |
219 | * a page we already have locked. | |
220 | * | |
221 | * We must do any isize and inode updates | |
222 | * before we unlock the pages. Otherwise we | |
223 | * could end up racing with unlink. | |
224 | */ | |
c8b97818 | 225 | BTRFS_I(inode)->disk_i_size = inode->i_size; |
79787eaa | 226 | ret = btrfs_update_inode(trans, root, inode); |
c2167754 | 227 | |
79787eaa | 228 | return ret; |
c8b97818 | 229 | fail: |
c8b97818 CM |
230 | return err; |
231 | } | |
232 | ||
233 | ||
234 | /* | |
235 | * conditionally insert an inline extent into the file. This | |
236 | * does the checks required to make sure the data is small enough | |
237 | * to fit as an inline extent. | |
238 | */ | |
00361589 JB |
239 | static noinline int cow_file_range_inline(struct btrfs_root *root, |
240 | struct inode *inode, u64 start, | |
241 | u64 end, size_t compressed_size, | |
242 | int compress_type, | |
243 | struct page **compressed_pages) | |
c8b97818 | 244 | { |
00361589 | 245 | struct btrfs_trans_handle *trans; |
c8b97818 CM |
246 | u64 isize = i_size_read(inode); |
247 | u64 actual_end = min(end + 1, isize); | |
248 | u64 inline_len = actual_end - start; | |
fda2832f | 249 | u64 aligned_end = ALIGN(end, root->sectorsize); |
c8b97818 CM |
250 | u64 data_len = inline_len; |
251 | int ret; | |
1acae57b FDBM |
252 | struct btrfs_path *path; |
253 | int extent_inserted = 0; | |
254 | u32 extent_item_size; | |
c8b97818 CM |
255 | |
256 | if (compressed_size) | |
257 | data_len = compressed_size; | |
258 | ||
259 | if (start > 0 || | |
354877be WS |
260 | actual_end > PAGE_CACHE_SIZE || |
261 | data_len > BTRFS_MAX_INLINE_DATA_SIZE(root) || | |
c8b97818 CM |
262 | (!compressed_size && |
263 | (actual_end & (root->sectorsize - 1)) == 0) || | |
264 | end + 1 < isize || | |
265 | data_len > root->fs_info->max_inline) { | |
266 | return 1; | |
267 | } | |
268 | ||
1acae57b FDBM |
269 | path = btrfs_alloc_path(); |
270 | if (!path) | |
271 | return -ENOMEM; | |
272 | ||
00361589 | 273 | trans = btrfs_join_transaction(root); |
1acae57b FDBM |
274 | if (IS_ERR(trans)) { |
275 | btrfs_free_path(path); | |
00361589 | 276 | return PTR_ERR(trans); |
1acae57b | 277 | } |
00361589 JB |
278 | trans->block_rsv = &root->fs_info->delalloc_block_rsv; |
279 | ||
1acae57b FDBM |
280 | if (compressed_size && compressed_pages) |
281 | extent_item_size = btrfs_file_extent_calc_inline_size( | |
282 | compressed_size); | |
283 | else | |
284 | extent_item_size = btrfs_file_extent_calc_inline_size( | |
285 | inline_len); | |
286 | ||
287 | ret = __btrfs_drop_extents(trans, root, inode, path, | |
288 | start, aligned_end, NULL, | |
289 | 1, 1, extent_item_size, &extent_inserted); | |
00361589 JB |
290 | if (ret) { |
291 | btrfs_abort_transaction(trans, root, ret); | |
292 | goto out; | |
293 | } | |
c8b97818 CM |
294 | |
295 | if (isize > actual_end) | |
296 | inline_len = min_t(u64, isize, actual_end); | |
1acae57b FDBM |
297 | ret = insert_inline_extent(trans, path, extent_inserted, |
298 | root, inode, start, | |
c8b97818 | 299 | inline_len, compressed_size, |
fe3f566c | 300 | compress_type, compressed_pages); |
2adcac1a | 301 | if (ret && ret != -ENOSPC) { |
79787eaa | 302 | btrfs_abort_transaction(trans, root, ret); |
00361589 | 303 | goto out; |
2adcac1a | 304 | } else if (ret == -ENOSPC) { |
00361589 JB |
305 | ret = 1; |
306 | goto out; | |
79787eaa | 307 | } |
2adcac1a | 308 | |
bdc20e67 | 309 | set_bit(BTRFS_INODE_NEEDS_FULL_SYNC, &BTRFS_I(inode)->runtime_flags); |
0ca1f7ce | 310 | btrfs_delalloc_release_metadata(inode, end + 1 - start); |
a1ed835e | 311 | btrfs_drop_extent_cache(inode, start, aligned_end - 1, 0); |
00361589 | 312 | out: |
1acae57b | 313 | btrfs_free_path(path); |
00361589 JB |
314 | btrfs_end_transaction(trans, root); |
315 | return ret; | |
c8b97818 CM |
316 | } |
317 | ||
771ed689 CM |
318 | struct async_extent { |
319 | u64 start; | |
320 | u64 ram_size; | |
321 | u64 compressed_size; | |
322 | struct page **pages; | |
323 | unsigned long nr_pages; | |
261507a0 | 324 | int compress_type; |
771ed689 CM |
325 | struct list_head list; |
326 | }; | |
327 | ||
328 | struct async_cow { | |
329 | struct inode *inode; | |
330 | struct btrfs_root *root; | |
331 | struct page *locked_page; | |
332 | u64 start; | |
333 | u64 end; | |
334 | struct list_head extents; | |
335 | struct btrfs_work work; | |
336 | }; | |
337 | ||
338 | static noinline int add_async_extent(struct async_cow *cow, | |
339 | u64 start, u64 ram_size, | |
340 | u64 compressed_size, | |
341 | struct page **pages, | |
261507a0 LZ |
342 | unsigned long nr_pages, |
343 | int compress_type) | |
771ed689 CM |
344 | { |
345 | struct async_extent *async_extent; | |
346 | ||
347 | async_extent = kmalloc(sizeof(*async_extent), GFP_NOFS); | |
79787eaa | 348 | BUG_ON(!async_extent); /* -ENOMEM */ |
771ed689 CM |
349 | async_extent->start = start; |
350 | async_extent->ram_size = ram_size; | |
351 | async_extent->compressed_size = compressed_size; | |
352 | async_extent->pages = pages; | |
353 | async_extent->nr_pages = nr_pages; | |
261507a0 | 354 | async_extent->compress_type = compress_type; |
771ed689 CM |
355 | list_add_tail(&async_extent->list, &cow->extents); |
356 | return 0; | |
357 | } | |
358 | ||
f79707b0 WS |
359 | static inline int inode_need_compress(struct inode *inode) |
360 | { | |
361 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
362 | ||
363 | /* force compress */ | |
364 | if (btrfs_test_opt(root, FORCE_COMPRESS)) | |
365 | return 1; | |
366 | /* bad compression ratios */ | |
367 | if (BTRFS_I(inode)->flags & BTRFS_INODE_NOCOMPRESS) | |
368 | return 0; | |
369 | if (btrfs_test_opt(root, COMPRESS) || | |
370 | BTRFS_I(inode)->flags & BTRFS_INODE_COMPRESS || | |
371 | BTRFS_I(inode)->force_compress) | |
372 | return 1; | |
373 | return 0; | |
374 | } | |
375 | ||
d352ac68 | 376 | /* |
771ed689 CM |
377 | * we create compressed extents in two phases. The first |
378 | * phase compresses a range of pages that have already been | |
379 | * locked (both pages and state bits are locked). | |
c8b97818 | 380 | * |
771ed689 CM |
381 | * This is done inside an ordered work queue, and the compression |
382 | * is spread across many cpus. The actual IO submission is step | |
383 | * two, and the ordered work queue takes care of making sure that | |
384 | * happens in the same order things were put onto the queue by | |
385 | * writepages and friends. | |
c8b97818 | 386 | * |
771ed689 CM |
387 | * If this code finds it can't get good compression, it puts an |
388 | * entry onto the work queue to write the uncompressed bytes. This | |
389 | * makes sure that both compressed inodes and uncompressed inodes | |
b2570314 AB |
390 | * are written in the same order that the flusher thread sent them |
391 | * down. | |
d352ac68 | 392 | */ |
c44f649e | 393 | static noinline void compress_file_range(struct inode *inode, |
771ed689 CM |
394 | struct page *locked_page, |
395 | u64 start, u64 end, | |
396 | struct async_cow *async_cow, | |
397 | int *num_added) | |
b888db2b CM |
398 | { |
399 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
db94535d | 400 | u64 num_bytes; |
db94535d | 401 | u64 blocksize = root->sectorsize; |
c8b97818 | 402 | u64 actual_end; |
42dc7bab | 403 | u64 isize = i_size_read(inode); |
e6dcd2dc | 404 | int ret = 0; |
c8b97818 CM |
405 | struct page **pages = NULL; |
406 | unsigned long nr_pages; | |
407 | unsigned long nr_pages_ret = 0; | |
408 | unsigned long total_compressed = 0; | |
409 | unsigned long total_in = 0; | |
410 | unsigned long max_compressed = 128 * 1024; | |
771ed689 | 411 | unsigned long max_uncompressed = 128 * 1024; |
c8b97818 CM |
412 | int i; |
413 | int will_compress; | |
261507a0 | 414 | int compress_type = root->fs_info->compress_type; |
4adaa611 | 415 | int redirty = 0; |
b888db2b | 416 | |
4cb13e5d LB |
417 | /* if this is a small write inside eof, kick off a defrag */ |
418 | if ((end - start + 1) < 16 * 1024 && | |
419 | (start > 0 || end + 1 < BTRFS_I(inode)->disk_i_size)) | |
4cb5300b CM |
420 | btrfs_add_inode_defrag(NULL, inode); |
421 | ||
42dc7bab | 422 | actual_end = min_t(u64, isize, end + 1); |
c8b97818 CM |
423 | again: |
424 | will_compress = 0; | |
425 | nr_pages = (end >> PAGE_CACHE_SHIFT) - (start >> PAGE_CACHE_SHIFT) + 1; | |
426 | nr_pages = min(nr_pages, (128 * 1024UL) / PAGE_CACHE_SIZE); | |
be20aa9d | 427 | |
f03d9301 CM |
428 | /* |
429 | * we don't want to send crud past the end of i_size through | |
430 | * compression, that's just a waste of CPU time. So, if the | |
431 | * end of the file is before the start of our current | |
432 | * requested range of bytes, we bail out to the uncompressed | |
433 | * cleanup code that can deal with all of this. | |
434 | * | |
435 | * It isn't really the fastest way to fix things, but this is a | |
436 | * very uncommon corner. | |
437 | */ | |
438 | if (actual_end <= start) | |
439 | goto cleanup_and_bail_uncompressed; | |
440 | ||
c8b97818 CM |
441 | total_compressed = actual_end - start; |
442 | ||
4bcbb332 SW |
443 | /* |
444 | * skip compression for a small file range(<=blocksize) that | |
445 | * isn't an inline extent, since it dosen't save disk space at all. | |
446 | */ | |
447 | if (total_compressed <= blocksize && | |
448 | (start > 0 || end + 1 < BTRFS_I(inode)->disk_i_size)) | |
449 | goto cleanup_and_bail_uncompressed; | |
450 | ||
c8b97818 CM |
451 | /* we want to make sure that amount of ram required to uncompress |
452 | * an extent is reasonable, so we limit the total size in ram | |
771ed689 CM |
453 | * of a compressed extent to 128k. This is a crucial number |
454 | * because it also controls how easily we can spread reads across | |
455 | * cpus for decompression. | |
456 | * | |
457 | * We also want to make sure the amount of IO required to do | |
458 | * a random read is reasonably small, so we limit the size of | |
459 | * a compressed extent to 128k. | |
c8b97818 CM |
460 | */ |
461 | total_compressed = min(total_compressed, max_uncompressed); | |
fda2832f | 462 | num_bytes = ALIGN(end - start + 1, blocksize); |
be20aa9d | 463 | num_bytes = max(blocksize, num_bytes); |
c8b97818 CM |
464 | total_in = 0; |
465 | ret = 0; | |
db94535d | 466 | |
771ed689 CM |
467 | /* |
468 | * we do compression for mount -o compress and when the | |
469 | * inode has not been flagged as nocompress. This flag can | |
470 | * change at any time if we discover bad compression ratios. | |
c8b97818 | 471 | */ |
f79707b0 | 472 | if (inode_need_compress(inode)) { |
c8b97818 | 473 | WARN_ON(pages); |
31e818fe | 474 | pages = kcalloc(nr_pages, sizeof(struct page *), GFP_NOFS); |
560f7d75 LZ |
475 | if (!pages) { |
476 | /* just bail out to the uncompressed code */ | |
477 | goto cont; | |
478 | } | |
c8b97818 | 479 | |
261507a0 LZ |
480 | if (BTRFS_I(inode)->force_compress) |
481 | compress_type = BTRFS_I(inode)->force_compress; | |
482 | ||
4adaa611 CM |
483 | /* |
484 | * we need to call clear_page_dirty_for_io on each | |
485 | * page in the range. Otherwise applications with the file | |
486 | * mmap'd can wander in and change the page contents while | |
487 | * we are compressing them. | |
488 | * | |
489 | * If the compression fails for any reason, we set the pages | |
490 | * dirty again later on. | |
491 | */ | |
492 | extent_range_clear_dirty_for_io(inode, start, end); | |
493 | redirty = 1; | |
261507a0 LZ |
494 | ret = btrfs_compress_pages(compress_type, |
495 | inode->i_mapping, start, | |
496 | total_compressed, pages, | |
497 | nr_pages, &nr_pages_ret, | |
498 | &total_in, | |
499 | &total_compressed, | |
500 | max_compressed); | |
c8b97818 CM |
501 | |
502 | if (!ret) { | |
503 | unsigned long offset = total_compressed & | |
504 | (PAGE_CACHE_SIZE - 1); | |
505 | struct page *page = pages[nr_pages_ret - 1]; | |
506 | char *kaddr; | |
507 | ||
508 | /* zero the tail end of the last page, we might be | |
509 | * sending it down to disk | |
510 | */ | |
511 | if (offset) { | |
7ac687d9 | 512 | kaddr = kmap_atomic(page); |
c8b97818 CM |
513 | memset(kaddr + offset, 0, |
514 | PAGE_CACHE_SIZE - offset); | |
7ac687d9 | 515 | kunmap_atomic(kaddr); |
c8b97818 CM |
516 | } |
517 | will_compress = 1; | |
518 | } | |
519 | } | |
560f7d75 | 520 | cont: |
c8b97818 CM |
521 | if (start == 0) { |
522 | /* lets try to make an inline extent */ | |
771ed689 | 523 | if (ret || total_in < (actual_end - start)) { |
c8b97818 | 524 | /* we didn't compress the entire range, try |
771ed689 | 525 | * to make an uncompressed inline extent. |
c8b97818 | 526 | */ |
00361589 JB |
527 | ret = cow_file_range_inline(root, inode, start, end, |
528 | 0, 0, NULL); | |
c8b97818 | 529 | } else { |
771ed689 | 530 | /* try making a compressed inline extent */ |
00361589 | 531 | ret = cow_file_range_inline(root, inode, start, end, |
fe3f566c LZ |
532 | total_compressed, |
533 | compress_type, pages); | |
c8b97818 | 534 | } |
79787eaa | 535 | if (ret <= 0) { |
151a41bc JB |
536 | unsigned long clear_flags = EXTENT_DELALLOC | |
537 | EXTENT_DEFRAG; | |
e6eb4314 FM |
538 | unsigned long page_error_op; |
539 | ||
151a41bc | 540 | clear_flags |= (ret < 0) ? EXTENT_DO_ACCOUNTING : 0; |
e6eb4314 | 541 | page_error_op = ret < 0 ? PAGE_SET_ERROR : 0; |
151a41bc | 542 | |
771ed689 | 543 | /* |
79787eaa JM |
544 | * inline extent creation worked or returned error, |
545 | * we don't need to create any more async work items. | |
546 | * Unlock and free up our temp pages. | |
771ed689 | 547 | */ |
c2790a2e | 548 | extent_clear_unlock_delalloc(inode, start, end, NULL, |
151a41bc | 549 | clear_flags, PAGE_UNLOCK | |
c2790a2e JB |
550 | PAGE_CLEAR_DIRTY | |
551 | PAGE_SET_WRITEBACK | | |
e6eb4314 | 552 | page_error_op | |
c2790a2e | 553 | PAGE_END_WRITEBACK); |
c8b97818 CM |
554 | goto free_pages_out; |
555 | } | |
556 | } | |
557 | ||
558 | if (will_compress) { | |
559 | /* | |
560 | * we aren't doing an inline extent round the compressed size | |
561 | * up to a block size boundary so the allocator does sane | |
562 | * things | |
563 | */ | |
fda2832f | 564 | total_compressed = ALIGN(total_compressed, blocksize); |
c8b97818 CM |
565 | |
566 | /* | |
567 | * one last check to make sure the compression is really a | |
568 | * win, compare the page count read with the blocks on disk | |
569 | */ | |
fda2832f | 570 | total_in = ALIGN(total_in, PAGE_CACHE_SIZE); |
c8b97818 CM |
571 | if (total_compressed >= total_in) { |
572 | will_compress = 0; | |
573 | } else { | |
c8b97818 CM |
574 | num_bytes = total_in; |
575 | } | |
576 | } | |
577 | if (!will_compress && pages) { | |
578 | /* | |
579 | * the compression code ran but failed to make things smaller, | |
580 | * free any pages it allocated and our page pointer array | |
581 | */ | |
582 | for (i = 0; i < nr_pages_ret; i++) { | |
70b99e69 | 583 | WARN_ON(pages[i]->mapping); |
c8b97818 CM |
584 | page_cache_release(pages[i]); |
585 | } | |
586 | kfree(pages); | |
587 | pages = NULL; | |
588 | total_compressed = 0; | |
589 | nr_pages_ret = 0; | |
590 | ||
591 | /* flag the file so we don't compress in the future */ | |
1e701a32 CM |
592 | if (!btrfs_test_opt(root, FORCE_COMPRESS) && |
593 | !(BTRFS_I(inode)->force_compress)) { | |
a555f810 | 594 | BTRFS_I(inode)->flags |= BTRFS_INODE_NOCOMPRESS; |
1e701a32 | 595 | } |
c8b97818 | 596 | } |
771ed689 CM |
597 | if (will_compress) { |
598 | *num_added += 1; | |
c8b97818 | 599 | |
771ed689 CM |
600 | /* the async work queues will take care of doing actual |
601 | * allocation on disk for these compressed pages, | |
602 | * and will submit them to the elevator. | |
603 | */ | |
604 | add_async_extent(async_cow, start, num_bytes, | |
261507a0 LZ |
605 | total_compressed, pages, nr_pages_ret, |
606 | compress_type); | |
179e29e4 | 607 | |
24ae6365 | 608 | if (start + num_bytes < end) { |
771ed689 CM |
609 | start += num_bytes; |
610 | pages = NULL; | |
611 | cond_resched(); | |
612 | goto again; | |
613 | } | |
614 | } else { | |
f03d9301 | 615 | cleanup_and_bail_uncompressed: |
771ed689 CM |
616 | /* |
617 | * No compression, but we still need to write the pages in | |
618 | * the file we've been given so far. redirty the locked | |
619 | * page if it corresponds to our extent and set things up | |
620 | * for the async work queue to run cow_file_range to do | |
621 | * the normal delalloc dance | |
622 | */ | |
623 | if (page_offset(locked_page) >= start && | |
624 | page_offset(locked_page) <= end) { | |
625 | __set_page_dirty_nobuffers(locked_page); | |
626 | /* unlocked later on in the async handlers */ | |
627 | } | |
4adaa611 CM |
628 | if (redirty) |
629 | extent_range_redirty_for_io(inode, start, end); | |
261507a0 LZ |
630 | add_async_extent(async_cow, start, end - start + 1, |
631 | 0, NULL, 0, BTRFS_COMPRESS_NONE); | |
771ed689 CM |
632 | *num_added += 1; |
633 | } | |
3b951516 | 634 | |
c44f649e | 635 | return; |
771ed689 CM |
636 | |
637 | free_pages_out: | |
638 | for (i = 0; i < nr_pages_ret; i++) { | |
639 | WARN_ON(pages[i]->mapping); | |
640 | page_cache_release(pages[i]); | |
641 | } | |
d397712b | 642 | kfree(pages); |
771ed689 | 643 | } |
771ed689 | 644 | |
40ae837b FM |
645 | static void free_async_extent_pages(struct async_extent *async_extent) |
646 | { | |
647 | int i; | |
648 | ||
649 | if (!async_extent->pages) | |
650 | return; | |
651 | ||
652 | for (i = 0; i < async_extent->nr_pages; i++) { | |
653 | WARN_ON(async_extent->pages[i]->mapping); | |
654 | page_cache_release(async_extent->pages[i]); | |
655 | } | |
656 | kfree(async_extent->pages); | |
657 | async_extent->nr_pages = 0; | |
658 | async_extent->pages = NULL; | |
771ed689 CM |
659 | } |
660 | ||
661 | /* | |
662 | * phase two of compressed writeback. This is the ordered portion | |
663 | * of the code, which only gets called in the order the work was | |
664 | * queued. We walk all the async extents created by compress_file_range | |
665 | * and send them down to the disk. | |
666 | */ | |
dec8f175 | 667 | static noinline void submit_compressed_extents(struct inode *inode, |
771ed689 CM |
668 | struct async_cow *async_cow) |
669 | { | |
670 | struct async_extent *async_extent; | |
671 | u64 alloc_hint = 0; | |
771ed689 CM |
672 | struct btrfs_key ins; |
673 | struct extent_map *em; | |
674 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
675 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; | |
676 | struct extent_io_tree *io_tree; | |
f5a84ee3 | 677 | int ret = 0; |
771ed689 | 678 | |
3e04e7f1 | 679 | again: |
d397712b | 680 | while (!list_empty(&async_cow->extents)) { |
771ed689 CM |
681 | async_extent = list_entry(async_cow->extents.next, |
682 | struct async_extent, list); | |
683 | list_del(&async_extent->list); | |
c8b97818 | 684 | |
771ed689 CM |
685 | io_tree = &BTRFS_I(inode)->io_tree; |
686 | ||
f5a84ee3 | 687 | retry: |
771ed689 CM |
688 | /* did the compression code fall back to uncompressed IO? */ |
689 | if (!async_extent->pages) { | |
690 | int page_started = 0; | |
691 | unsigned long nr_written = 0; | |
692 | ||
693 | lock_extent(io_tree, async_extent->start, | |
2ac55d41 | 694 | async_extent->start + |
d0082371 | 695 | async_extent->ram_size - 1); |
771ed689 CM |
696 | |
697 | /* allocate blocks */ | |
f5a84ee3 JB |
698 | ret = cow_file_range(inode, async_cow->locked_page, |
699 | async_extent->start, | |
700 | async_extent->start + | |
701 | async_extent->ram_size - 1, | |
702 | &page_started, &nr_written, 0); | |
771ed689 | 703 | |
79787eaa JM |
704 | /* JDM XXX */ |
705 | ||
771ed689 CM |
706 | /* |
707 | * if page_started, cow_file_range inserted an | |
708 | * inline extent and took care of all the unlocking | |
709 | * and IO for us. Otherwise, we need to submit | |
710 | * all those pages down to the drive. | |
711 | */ | |
f5a84ee3 | 712 | if (!page_started && !ret) |
771ed689 CM |
713 | extent_write_locked_range(io_tree, |
714 | inode, async_extent->start, | |
d397712b | 715 | async_extent->start + |
771ed689 CM |
716 | async_extent->ram_size - 1, |
717 | btrfs_get_extent, | |
718 | WB_SYNC_ALL); | |
3e04e7f1 JB |
719 | else if (ret) |
720 | unlock_page(async_cow->locked_page); | |
771ed689 CM |
721 | kfree(async_extent); |
722 | cond_resched(); | |
723 | continue; | |
724 | } | |
725 | ||
726 | lock_extent(io_tree, async_extent->start, | |
d0082371 | 727 | async_extent->start + async_extent->ram_size - 1); |
771ed689 | 728 | |
00361589 | 729 | ret = btrfs_reserve_extent(root, |
771ed689 CM |
730 | async_extent->compressed_size, |
731 | async_extent->compressed_size, | |
e570fd27 | 732 | 0, alloc_hint, &ins, 1, 1); |
f5a84ee3 | 733 | if (ret) { |
40ae837b | 734 | free_async_extent_pages(async_extent); |
3e04e7f1 | 735 | |
fdf8e2ea JB |
736 | if (ret == -ENOSPC) { |
737 | unlock_extent(io_tree, async_extent->start, | |
738 | async_extent->start + | |
739 | async_extent->ram_size - 1); | |
ce62003f LB |
740 | |
741 | /* | |
742 | * we need to redirty the pages if we decide to | |
743 | * fallback to uncompressed IO, otherwise we | |
744 | * will not submit these pages down to lower | |
745 | * layers. | |
746 | */ | |
747 | extent_range_redirty_for_io(inode, | |
748 | async_extent->start, | |
749 | async_extent->start + | |
750 | async_extent->ram_size - 1); | |
751 | ||
79787eaa | 752 | goto retry; |
fdf8e2ea | 753 | } |
3e04e7f1 | 754 | goto out_free; |
f5a84ee3 | 755 | } |
c2167754 YZ |
756 | /* |
757 | * here we're doing allocation and writeback of the | |
758 | * compressed pages | |
759 | */ | |
760 | btrfs_drop_extent_cache(inode, async_extent->start, | |
761 | async_extent->start + | |
762 | async_extent->ram_size - 1, 0); | |
763 | ||
172ddd60 | 764 | em = alloc_extent_map(); |
b9aa55be LB |
765 | if (!em) { |
766 | ret = -ENOMEM; | |
3e04e7f1 | 767 | goto out_free_reserve; |
b9aa55be | 768 | } |
771ed689 CM |
769 | em->start = async_extent->start; |
770 | em->len = async_extent->ram_size; | |
445a6944 | 771 | em->orig_start = em->start; |
2ab28f32 JB |
772 | em->mod_start = em->start; |
773 | em->mod_len = em->len; | |
c8b97818 | 774 | |
771ed689 CM |
775 | em->block_start = ins.objectid; |
776 | em->block_len = ins.offset; | |
b4939680 | 777 | em->orig_block_len = ins.offset; |
cc95bef6 | 778 | em->ram_bytes = async_extent->ram_size; |
771ed689 | 779 | em->bdev = root->fs_info->fs_devices->latest_bdev; |
261507a0 | 780 | em->compress_type = async_extent->compress_type; |
771ed689 CM |
781 | set_bit(EXTENT_FLAG_PINNED, &em->flags); |
782 | set_bit(EXTENT_FLAG_COMPRESSED, &em->flags); | |
70c8a91c | 783 | em->generation = -1; |
771ed689 | 784 | |
d397712b | 785 | while (1) { |
890871be | 786 | write_lock(&em_tree->lock); |
09a2a8f9 | 787 | ret = add_extent_mapping(em_tree, em, 1); |
890871be | 788 | write_unlock(&em_tree->lock); |
771ed689 CM |
789 | if (ret != -EEXIST) { |
790 | free_extent_map(em); | |
791 | break; | |
792 | } | |
793 | btrfs_drop_extent_cache(inode, async_extent->start, | |
794 | async_extent->start + | |
795 | async_extent->ram_size - 1, 0); | |
796 | } | |
797 | ||
3e04e7f1 JB |
798 | if (ret) |
799 | goto out_free_reserve; | |
800 | ||
261507a0 LZ |
801 | ret = btrfs_add_ordered_extent_compress(inode, |
802 | async_extent->start, | |
803 | ins.objectid, | |
804 | async_extent->ram_size, | |
805 | ins.offset, | |
806 | BTRFS_ORDERED_COMPRESSED, | |
807 | async_extent->compress_type); | |
d9f85963 FM |
808 | if (ret) { |
809 | btrfs_drop_extent_cache(inode, async_extent->start, | |
810 | async_extent->start + | |
811 | async_extent->ram_size - 1, 0); | |
3e04e7f1 | 812 | goto out_free_reserve; |
d9f85963 | 813 | } |
771ed689 | 814 | |
771ed689 CM |
815 | /* |
816 | * clear dirty, set writeback and unlock the pages. | |
817 | */ | |
c2790a2e | 818 | extent_clear_unlock_delalloc(inode, async_extent->start, |
a791e35e CM |
819 | async_extent->start + |
820 | async_extent->ram_size - 1, | |
151a41bc JB |
821 | NULL, EXTENT_LOCKED | EXTENT_DELALLOC, |
822 | PAGE_UNLOCK | PAGE_CLEAR_DIRTY | | |
c2790a2e | 823 | PAGE_SET_WRITEBACK); |
771ed689 | 824 | ret = btrfs_submit_compressed_write(inode, |
d397712b CM |
825 | async_extent->start, |
826 | async_extent->ram_size, | |
827 | ins.objectid, | |
828 | ins.offset, async_extent->pages, | |
829 | async_extent->nr_pages); | |
fce2a4e6 FM |
830 | if (ret) { |
831 | struct extent_io_tree *tree = &BTRFS_I(inode)->io_tree; | |
832 | struct page *p = async_extent->pages[0]; | |
833 | const u64 start = async_extent->start; | |
834 | const u64 end = start + async_extent->ram_size - 1; | |
835 | ||
836 | p->mapping = inode->i_mapping; | |
837 | tree->ops->writepage_end_io_hook(p, start, end, | |
838 | NULL, 0); | |
839 | p->mapping = NULL; | |
840 | extent_clear_unlock_delalloc(inode, start, end, NULL, 0, | |
841 | PAGE_END_WRITEBACK | | |
842 | PAGE_SET_ERROR); | |
40ae837b | 843 | free_async_extent_pages(async_extent); |
fce2a4e6 | 844 | } |
771ed689 CM |
845 | alloc_hint = ins.objectid + ins.offset; |
846 | kfree(async_extent); | |
847 | cond_resched(); | |
848 | } | |
dec8f175 | 849 | return; |
3e04e7f1 | 850 | out_free_reserve: |
e570fd27 | 851 | btrfs_free_reserved_extent(root, ins.objectid, ins.offset, 1); |
79787eaa | 852 | out_free: |
c2790a2e | 853 | extent_clear_unlock_delalloc(inode, async_extent->start, |
3e04e7f1 JB |
854 | async_extent->start + |
855 | async_extent->ram_size - 1, | |
c2790a2e | 856 | NULL, EXTENT_LOCKED | EXTENT_DELALLOC | |
151a41bc JB |
857 | EXTENT_DEFRAG | EXTENT_DO_ACCOUNTING, |
858 | PAGE_UNLOCK | PAGE_CLEAR_DIRTY | | |
704de49d FM |
859 | PAGE_SET_WRITEBACK | PAGE_END_WRITEBACK | |
860 | PAGE_SET_ERROR); | |
40ae837b | 861 | free_async_extent_pages(async_extent); |
79787eaa | 862 | kfree(async_extent); |
3e04e7f1 | 863 | goto again; |
771ed689 CM |
864 | } |
865 | ||
4b46fce2 JB |
866 | static u64 get_extent_allocation_hint(struct inode *inode, u64 start, |
867 | u64 num_bytes) | |
868 | { | |
869 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; | |
870 | struct extent_map *em; | |
871 | u64 alloc_hint = 0; | |
872 | ||
873 | read_lock(&em_tree->lock); | |
874 | em = search_extent_mapping(em_tree, start, num_bytes); | |
875 | if (em) { | |
876 | /* | |
877 | * if block start isn't an actual block number then find the | |
878 | * first block in this inode and use that as a hint. If that | |
879 | * block is also bogus then just don't worry about it. | |
880 | */ | |
881 | if (em->block_start >= EXTENT_MAP_LAST_BYTE) { | |
882 | free_extent_map(em); | |
883 | em = search_extent_mapping(em_tree, 0, 0); | |
884 | if (em && em->block_start < EXTENT_MAP_LAST_BYTE) | |
885 | alloc_hint = em->block_start; | |
886 | if (em) | |
887 | free_extent_map(em); | |
888 | } else { | |
889 | alloc_hint = em->block_start; | |
890 | free_extent_map(em); | |
891 | } | |
892 | } | |
893 | read_unlock(&em_tree->lock); | |
894 | ||
895 | return alloc_hint; | |
896 | } | |
897 | ||
771ed689 CM |
898 | /* |
899 | * when extent_io.c finds a delayed allocation range in the file, | |
900 | * the call backs end up in this code. The basic idea is to | |
901 | * allocate extents on disk for the range, and create ordered data structs | |
902 | * in ram to track those extents. | |
903 | * | |
904 | * locked_page is the page that writepage had locked already. We use | |
905 | * it to make sure we don't do extra locks or unlocks. | |
906 | * | |
907 | * *page_started is set to one if we unlock locked_page and do everything | |
908 | * required to start IO on it. It may be clean and already done with | |
909 | * IO when we return. | |
910 | */ | |
00361589 JB |
911 | static noinline int cow_file_range(struct inode *inode, |
912 | struct page *locked_page, | |
913 | u64 start, u64 end, int *page_started, | |
914 | unsigned long *nr_written, | |
915 | int unlock) | |
771ed689 | 916 | { |
00361589 | 917 | struct btrfs_root *root = BTRFS_I(inode)->root; |
771ed689 CM |
918 | u64 alloc_hint = 0; |
919 | u64 num_bytes; | |
920 | unsigned long ram_size; | |
921 | u64 disk_num_bytes; | |
922 | u64 cur_alloc_size; | |
923 | u64 blocksize = root->sectorsize; | |
771ed689 CM |
924 | struct btrfs_key ins; |
925 | struct extent_map *em; | |
926 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; | |
927 | int ret = 0; | |
928 | ||
02ecd2c2 JB |
929 | if (btrfs_is_free_space_inode(inode)) { |
930 | WARN_ON_ONCE(1); | |
29bce2f3 JB |
931 | ret = -EINVAL; |
932 | goto out_unlock; | |
02ecd2c2 | 933 | } |
771ed689 | 934 | |
fda2832f | 935 | num_bytes = ALIGN(end - start + 1, blocksize); |
771ed689 CM |
936 | num_bytes = max(blocksize, num_bytes); |
937 | disk_num_bytes = num_bytes; | |
771ed689 | 938 | |
4cb5300b | 939 | /* if this is a small write inside eof, kick off defrag */ |
4cb13e5d LB |
940 | if (num_bytes < 64 * 1024 && |
941 | (start > 0 || end + 1 < BTRFS_I(inode)->disk_i_size)) | |
00361589 | 942 | btrfs_add_inode_defrag(NULL, inode); |
4cb5300b | 943 | |
771ed689 CM |
944 | if (start == 0) { |
945 | /* lets try to make an inline extent */ | |
00361589 JB |
946 | ret = cow_file_range_inline(root, inode, start, end, 0, 0, |
947 | NULL); | |
771ed689 | 948 | if (ret == 0) { |
c2790a2e JB |
949 | extent_clear_unlock_delalloc(inode, start, end, NULL, |
950 | EXTENT_LOCKED | EXTENT_DELALLOC | | |
151a41bc | 951 | EXTENT_DEFRAG, PAGE_UNLOCK | |
c2790a2e JB |
952 | PAGE_CLEAR_DIRTY | PAGE_SET_WRITEBACK | |
953 | PAGE_END_WRITEBACK); | |
c2167754 | 954 | |
771ed689 CM |
955 | *nr_written = *nr_written + |
956 | (end - start + PAGE_CACHE_SIZE) / PAGE_CACHE_SIZE; | |
957 | *page_started = 1; | |
771ed689 | 958 | goto out; |
79787eaa | 959 | } else if (ret < 0) { |
79787eaa | 960 | goto out_unlock; |
771ed689 CM |
961 | } |
962 | } | |
963 | ||
964 | BUG_ON(disk_num_bytes > | |
6c41761f | 965 | btrfs_super_total_bytes(root->fs_info->super_copy)); |
771ed689 | 966 | |
4b46fce2 | 967 | alloc_hint = get_extent_allocation_hint(inode, start, num_bytes); |
771ed689 CM |
968 | btrfs_drop_extent_cache(inode, start, start + num_bytes - 1, 0); |
969 | ||
d397712b | 970 | while (disk_num_bytes > 0) { |
a791e35e CM |
971 | unsigned long op; |
972 | ||
287a0ab9 | 973 | cur_alloc_size = disk_num_bytes; |
00361589 | 974 | ret = btrfs_reserve_extent(root, cur_alloc_size, |
771ed689 | 975 | root->sectorsize, 0, alloc_hint, |
e570fd27 | 976 | &ins, 1, 1); |
00361589 | 977 | if (ret < 0) |
79787eaa | 978 | goto out_unlock; |
d397712b | 979 | |
172ddd60 | 980 | em = alloc_extent_map(); |
b9aa55be LB |
981 | if (!em) { |
982 | ret = -ENOMEM; | |
ace68bac | 983 | goto out_reserve; |
b9aa55be | 984 | } |
e6dcd2dc | 985 | em->start = start; |
445a6944 | 986 | em->orig_start = em->start; |
771ed689 CM |
987 | ram_size = ins.offset; |
988 | em->len = ins.offset; | |
2ab28f32 JB |
989 | em->mod_start = em->start; |
990 | em->mod_len = em->len; | |
c8b97818 | 991 | |
e6dcd2dc | 992 | em->block_start = ins.objectid; |
c8b97818 | 993 | em->block_len = ins.offset; |
b4939680 | 994 | em->orig_block_len = ins.offset; |
cc95bef6 | 995 | em->ram_bytes = ram_size; |
e6dcd2dc | 996 | em->bdev = root->fs_info->fs_devices->latest_bdev; |
7f3c74fb | 997 | set_bit(EXTENT_FLAG_PINNED, &em->flags); |
70c8a91c | 998 | em->generation = -1; |
c8b97818 | 999 | |
d397712b | 1000 | while (1) { |
890871be | 1001 | write_lock(&em_tree->lock); |
09a2a8f9 | 1002 | ret = add_extent_mapping(em_tree, em, 1); |
890871be | 1003 | write_unlock(&em_tree->lock); |
e6dcd2dc CM |
1004 | if (ret != -EEXIST) { |
1005 | free_extent_map(em); | |
1006 | break; | |
1007 | } | |
1008 | btrfs_drop_extent_cache(inode, start, | |
c8b97818 | 1009 | start + ram_size - 1, 0); |
e6dcd2dc | 1010 | } |
ace68bac LB |
1011 | if (ret) |
1012 | goto out_reserve; | |
e6dcd2dc | 1013 | |
98d20f67 | 1014 | cur_alloc_size = ins.offset; |
e6dcd2dc | 1015 | ret = btrfs_add_ordered_extent(inode, start, ins.objectid, |
771ed689 | 1016 | ram_size, cur_alloc_size, 0); |
ace68bac | 1017 | if (ret) |
d9f85963 | 1018 | goto out_drop_extent_cache; |
c8b97818 | 1019 | |
17d217fe YZ |
1020 | if (root->root_key.objectid == |
1021 | BTRFS_DATA_RELOC_TREE_OBJECTID) { | |
1022 | ret = btrfs_reloc_clone_csums(inode, start, | |
1023 | cur_alloc_size); | |
00361589 | 1024 | if (ret) |
d9f85963 | 1025 | goto out_drop_extent_cache; |
17d217fe YZ |
1026 | } |
1027 | ||
d397712b | 1028 | if (disk_num_bytes < cur_alloc_size) |
3b951516 | 1029 | break; |
d397712b | 1030 | |
c8b97818 CM |
1031 | /* we're not doing compressed IO, don't unlock the first |
1032 | * page (which the caller expects to stay locked), don't | |
1033 | * clear any dirty bits and don't set any writeback bits | |
8b62b72b CM |
1034 | * |
1035 | * Do set the Private2 bit so we know this page was properly | |
1036 | * setup for writepage | |
c8b97818 | 1037 | */ |
c2790a2e JB |
1038 | op = unlock ? PAGE_UNLOCK : 0; |
1039 | op |= PAGE_SET_PRIVATE2; | |
a791e35e | 1040 | |
c2790a2e JB |
1041 | extent_clear_unlock_delalloc(inode, start, |
1042 | start + ram_size - 1, locked_page, | |
1043 | EXTENT_LOCKED | EXTENT_DELALLOC, | |
1044 | op); | |
c8b97818 | 1045 | disk_num_bytes -= cur_alloc_size; |
c59f8951 CM |
1046 | num_bytes -= cur_alloc_size; |
1047 | alloc_hint = ins.objectid + ins.offset; | |
1048 | start += cur_alloc_size; | |
b888db2b | 1049 | } |
79787eaa | 1050 | out: |
be20aa9d | 1051 | return ret; |
b7d5b0a8 | 1052 | |
d9f85963 FM |
1053 | out_drop_extent_cache: |
1054 | btrfs_drop_extent_cache(inode, start, start + ram_size - 1, 0); | |
ace68bac | 1055 | out_reserve: |
e570fd27 | 1056 | btrfs_free_reserved_extent(root, ins.objectid, ins.offset, 1); |
79787eaa | 1057 | out_unlock: |
c2790a2e | 1058 | extent_clear_unlock_delalloc(inode, start, end, locked_page, |
151a41bc JB |
1059 | EXTENT_LOCKED | EXTENT_DO_ACCOUNTING | |
1060 | EXTENT_DELALLOC | EXTENT_DEFRAG, | |
1061 | PAGE_UNLOCK | PAGE_CLEAR_DIRTY | | |
1062 | PAGE_SET_WRITEBACK | PAGE_END_WRITEBACK); | |
79787eaa | 1063 | goto out; |
771ed689 | 1064 | } |
c8b97818 | 1065 | |
771ed689 CM |
1066 | /* |
1067 | * work queue call back to started compression on a file and pages | |
1068 | */ | |
1069 | static noinline void async_cow_start(struct btrfs_work *work) | |
1070 | { | |
1071 | struct async_cow *async_cow; | |
1072 | int num_added = 0; | |
1073 | async_cow = container_of(work, struct async_cow, work); | |
1074 | ||
1075 | compress_file_range(async_cow->inode, async_cow->locked_page, | |
1076 | async_cow->start, async_cow->end, async_cow, | |
1077 | &num_added); | |
8180ef88 | 1078 | if (num_added == 0) { |
cb77fcd8 | 1079 | btrfs_add_delayed_iput(async_cow->inode); |
771ed689 | 1080 | async_cow->inode = NULL; |
8180ef88 | 1081 | } |
771ed689 CM |
1082 | } |
1083 | ||
1084 | /* | |
1085 | * work queue call back to submit previously compressed pages | |
1086 | */ | |
1087 | static noinline void async_cow_submit(struct btrfs_work *work) | |
1088 | { | |
1089 | struct async_cow *async_cow; | |
1090 | struct btrfs_root *root; | |
1091 | unsigned long nr_pages; | |
1092 | ||
1093 | async_cow = container_of(work, struct async_cow, work); | |
1094 | ||
1095 | root = async_cow->root; | |
1096 | nr_pages = (async_cow->end - async_cow->start + PAGE_CACHE_SIZE) >> | |
1097 | PAGE_CACHE_SHIFT; | |
1098 | ||
66657b31 | 1099 | if (atomic_sub_return(nr_pages, &root->fs_info->async_delalloc_pages) < |
287082b0 | 1100 | 5 * 1024 * 1024 && |
771ed689 CM |
1101 | waitqueue_active(&root->fs_info->async_submit_wait)) |
1102 | wake_up(&root->fs_info->async_submit_wait); | |
1103 | ||
d397712b | 1104 | if (async_cow->inode) |
771ed689 | 1105 | submit_compressed_extents(async_cow->inode, async_cow); |
771ed689 | 1106 | } |
c8b97818 | 1107 | |
771ed689 CM |
1108 | static noinline void async_cow_free(struct btrfs_work *work) |
1109 | { | |
1110 | struct async_cow *async_cow; | |
1111 | async_cow = container_of(work, struct async_cow, work); | |
8180ef88 | 1112 | if (async_cow->inode) |
cb77fcd8 | 1113 | btrfs_add_delayed_iput(async_cow->inode); |
771ed689 CM |
1114 | kfree(async_cow); |
1115 | } | |
1116 | ||
1117 | static int cow_file_range_async(struct inode *inode, struct page *locked_page, | |
1118 | u64 start, u64 end, int *page_started, | |
1119 | unsigned long *nr_written) | |
1120 | { | |
1121 | struct async_cow *async_cow; | |
1122 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
1123 | unsigned long nr_pages; | |
1124 | u64 cur_end; | |
287082b0 | 1125 | int limit = 10 * 1024 * 1024; |
771ed689 | 1126 | |
a3429ab7 CM |
1127 | clear_extent_bit(&BTRFS_I(inode)->io_tree, start, end, EXTENT_LOCKED, |
1128 | 1, 0, NULL, GFP_NOFS); | |
d397712b | 1129 | while (start < end) { |
771ed689 | 1130 | async_cow = kmalloc(sizeof(*async_cow), GFP_NOFS); |
79787eaa | 1131 | BUG_ON(!async_cow); /* -ENOMEM */ |
8180ef88 | 1132 | async_cow->inode = igrab(inode); |
771ed689 CM |
1133 | async_cow->root = root; |
1134 | async_cow->locked_page = locked_page; | |
1135 | async_cow->start = start; | |
1136 | ||
f79707b0 WS |
1137 | if (BTRFS_I(inode)->flags & BTRFS_INODE_NOCOMPRESS && |
1138 | !btrfs_test_opt(root, FORCE_COMPRESS)) | |
771ed689 CM |
1139 | cur_end = end; |
1140 | else | |
1141 | cur_end = min(end, start + 512 * 1024 - 1); | |
1142 | ||
1143 | async_cow->end = cur_end; | |
1144 | INIT_LIST_HEAD(&async_cow->extents); | |
1145 | ||
9e0af237 LB |
1146 | btrfs_init_work(&async_cow->work, |
1147 | btrfs_delalloc_helper, | |
1148 | async_cow_start, async_cow_submit, | |
1149 | async_cow_free); | |
771ed689 | 1150 | |
771ed689 CM |
1151 | nr_pages = (cur_end - start + PAGE_CACHE_SIZE) >> |
1152 | PAGE_CACHE_SHIFT; | |
1153 | atomic_add(nr_pages, &root->fs_info->async_delalloc_pages); | |
1154 | ||
afe3d242 QW |
1155 | btrfs_queue_work(root->fs_info->delalloc_workers, |
1156 | &async_cow->work); | |
771ed689 CM |
1157 | |
1158 | if (atomic_read(&root->fs_info->async_delalloc_pages) > limit) { | |
1159 | wait_event(root->fs_info->async_submit_wait, | |
1160 | (atomic_read(&root->fs_info->async_delalloc_pages) < | |
1161 | limit)); | |
1162 | } | |
1163 | ||
d397712b | 1164 | while (atomic_read(&root->fs_info->async_submit_draining) && |
771ed689 CM |
1165 | atomic_read(&root->fs_info->async_delalloc_pages)) { |
1166 | wait_event(root->fs_info->async_submit_wait, | |
1167 | (atomic_read(&root->fs_info->async_delalloc_pages) == | |
1168 | 0)); | |
1169 | } | |
1170 | ||
1171 | *nr_written += nr_pages; | |
1172 | start = cur_end + 1; | |
1173 | } | |
1174 | *page_started = 1; | |
1175 | return 0; | |
be20aa9d CM |
1176 | } |
1177 | ||
d397712b | 1178 | static noinline int csum_exist_in_range(struct btrfs_root *root, |
17d217fe YZ |
1179 | u64 bytenr, u64 num_bytes) |
1180 | { | |
1181 | int ret; | |
1182 | struct btrfs_ordered_sum *sums; | |
1183 | LIST_HEAD(list); | |
1184 | ||
07d400a6 | 1185 | ret = btrfs_lookup_csums_range(root->fs_info->csum_root, bytenr, |
a2de733c | 1186 | bytenr + num_bytes - 1, &list, 0); |
17d217fe YZ |
1187 | if (ret == 0 && list_empty(&list)) |
1188 | return 0; | |
1189 | ||
1190 | while (!list_empty(&list)) { | |
1191 | sums = list_entry(list.next, struct btrfs_ordered_sum, list); | |
1192 | list_del(&sums->list); | |
1193 | kfree(sums); | |
1194 | } | |
1195 | return 1; | |
1196 | } | |
1197 | ||
d352ac68 CM |
1198 | /* |
1199 | * when nowcow writeback call back. This checks for snapshots or COW copies | |
1200 | * of the extents that exist in the file, and COWs the file as required. | |
1201 | * | |
1202 | * If no cow copies or snapshots exist, we write directly to the existing | |
1203 | * blocks on disk | |
1204 | */ | |
7f366cfe CM |
1205 | static noinline int run_delalloc_nocow(struct inode *inode, |
1206 | struct page *locked_page, | |
771ed689 CM |
1207 | u64 start, u64 end, int *page_started, int force, |
1208 | unsigned long *nr_written) | |
be20aa9d | 1209 | { |
be20aa9d | 1210 | struct btrfs_root *root = BTRFS_I(inode)->root; |
7ea394f1 | 1211 | struct btrfs_trans_handle *trans; |
be20aa9d | 1212 | struct extent_buffer *leaf; |
be20aa9d | 1213 | struct btrfs_path *path; |
80ff3856 | 1214 | struct btrfs_file_extent_item *fi; |
be20aa9d | 1215 | struct btrfs_key found_key; |
80ff3856 YZ |
1216 | u64 cow_start; |
1217 | u64 cur_offset; | |
1218 | u64 extent_end; | |
5d4f98a2 | 1219 | u64 extent_offset; |
80ff3856 YZ |
1220 | u64 disk_bytenr; |
1221 | u64 num_bytes; | |
b4939680 | 1222 | u64 disk_num_bytes; |
cc95bef6 | 1223 | u64 ram_bytes; |
80ff3856 | 1224 | int extent_type; |
79787eaa | 1225 | int ret, err; |
d899e052 | 1226 | int type; |
80ff3856 YZ |
1227 | int nocow; |
1228 | int check_prev = 1; | |
82d5902d | 1229 | bool nolock; |
33345d01 | 1230 | u64 ino = btrfs_ino(inode); |
be20aa9d CM |
1231 | |
1232 | path = btrfs_alloc_path(); | |
17ca04af | 1233 | if (!path) { |
c2790a2e JB |
1234 | extent_clear_unlock_delalloc(inode, start, end, locked_page, |
1235 | EXTENT_LOCKED | EXTENT_DELALLOC | | |
151a41bc JB |
1236 | EXTENT_DO_ACCOUNTING | |
1237 | EXTENT_DEFRAG, PAGE_UNLOCK | | |
c2790a2e JB |
1238 | PAGE_CLEAR_DIRTY | |
1239 | PAGE_SET_WRITEBACK | | |
1240 | PAGE_END_WRITEBACK); | |
d8926bb3 | 1241 | return -ENOMEM; |
17ca04af | 1242 | } |
82d5902d | 1243 | |
83eea1f1 | 1244 | nolock = btrfs_is_free_space_inode(inode); |
82d5902d LZ |
1245 | |
1246 | if (nolock) | |
7a7eaa40 | 1247 | trans = btrfs_join_transaction_nolock(root); |
82d5902d | 1248 | else |
7a7eaa40 | 1249 | trans = btrfs_join_transaction(root); |
ff5714cc | 1250 | |
79787eaa | 1251 | if (IS_ERR(trans)) { |
c2790a2e JB |
1252 | extent_clear_unlock_delalloc(inode, start, end, locked_page, |
1253 | EXTENT_LOCKED | EXTENT_DELALLOC | | |
151a41bc JB |
1254 | EXTENT_DO_ACCOUNTING | |
1255 | EXTENT_DEFRAG, PAGE_UNLOCK | | |
c2790a2e JB |
1256 | PAGE_CLEAR_DIRTY | |
1257 | PAGE_SET_WRITEBACK | | |
1258 | PAGE_END_WRITEBACK); | |
79787eaa JM |
1259 | btrfs_free_path(path); |
1260 | return PTR_ERR(trans); | |
1261 | } | |
1262 | ||
74b21075 | 1263 | trans->block_rsv = &root->fs_info->delalloc_block_rsv; |
be20aa9d | 1264 | |
80ff3856 YZ |
1265 | cow_start = (u64)-1; |
1266 | cur_offset = start; | |
1267 | while (1) { | |
33345d01 | 1268 | ret = btrfs_lookup_file_extent(trans, root, path, ino, |
80ff3856 | 1269 | cur_offset, 0); |
d788a349 | 1270 | if (ret < 0) |
79787eaa | 1271 | goto error; |
80ff3856 YZ |
1272 | if (ret > 0 && path->slots[0] > 0 && check_prev) { |
1273 | leaf = path->nodes[0]; | |
1274 | btrfs_item_key_to_cpu(leaf, &found_key, | |
1275 | path->slots[0] - 1); | |
33345d01 | 1276 | if (found_key.objectid == ino && |
80ff3856 YZ |
1277 | found_key.type == BTRFS_EXTENT_DATA_KEY) |
1278 | path->slots[0]--; | |
1279 | } | |
1280 | check_prev = 0; | |
1281 | next_slot: | |
1282 | leaf = path->nodes[0]; | |
1283 | if (path->slots[0] >= btrfs_header_nritems(leaf)) { | |
1284 | ret = btrfs_next_leaf(root, path); | |
d788a349 | 1285 | if (ret < 0) |
79787eaa | 1286 | goto error; |
80ff3856 YZ |
1287 | if (ret > 0) |
1288 | break; | |
1289 | leaf = path->nodes[0]; | |
1290 | } | |
be20aa9d | 1291 | |
80ff3856 YZ |
1292 | nocow = 0; |
1293 | disk_bytenr = 0; | |
17d217fe | 1294 | num_bytes = 0; |
80ff3856 YZ |
1295 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); |
1296 | ||
33345d01 | 1297 | if (found_key.objectid > ino || |
80ff3856 YZ |
1298 | found_key.type > BTRFS_EXTENT_DATA_KEY || |
1299 | found_key.offset > end) | |
1300 | break; | |
1301 | ||
1302 | if (found_key.offset > cur_offset) { | |
1303 | extent_end = found_key.offset; | |
e9061e21 | 1304 | extent_type = 0; |
80ff3856 YZ |
1305 | goto out_check; |
1306 | } | |
1307 | ||
1308 | fi = btrfs_item_ptr(leaf, path->slots[0], | |
1309 | struct btrfs_file_extent_item); | |
1310 | extent_type = btrfs_file_extent_type(leaf, fi); | |
1311 | ||
cc95bef6 | 1312 | ram_bytes = btrfs_file_extent_ram_bytes(leaf, fi); |
d899e052 YZ |
1313 | if (extent_type == BTRFS_FILE_EXTENT_REG || |
1314 | extent_type == BTRFS_FILE_EXTENT_PREALLOC) { | |
80ff3856 | 1315 | disk_bytenr = btrfs_file_extent_disk_bytenr(leaf, fi); |
5d4f98a2 | 1316 | extent_offset = btrfs_file_extent_offset(leaf, fi); |
80ff3856 YZ |
1317 | extent_end = found_key.offset + |
1318 | btrfs_file_extent_num_bytes(leaf, fi); | |
b4939680 JB |
1319 | disk_num_bytes = |
1320 | btrfs_file_extent_disk_num_bytes(leaf, fi); | |
80ff3856 YZ |
1321 | if (extent_end <= start) { |
1322 | path->slots[0]++; | |
1323 | goto next_slot; | |
1324 | } | |
17d217fe YZ |
1325 | if (disk_bytenr == 0) |
1326 | goto out_check; | |
80ff3856 YZ |
1327 | if (btrfs_file_extent_compression(leaf, fi) || |
1328 | btrfs_file_extent_encryption(leaf, fi) || | |
1329 | btrfs_file_extent_other_encoding(leaf, fi)) | |
1330 | goto out_check; | |
d899e052 YZ |
1331 | if (extent_type == BTRFS_FILE_EXTENT_REG && !force) |
1332 | goto out_check; | |
d2fb3437 | 1333 | if (btrfs_extent_readonly(root, disk_bytenr)) |
80ff3856 | 1334 | goto out_check; |
33345d01 | 1335 | if (btrfs_cross_ref_exist(trans, root, ino, |
5d4f98a2 YZ |
1336 | found_key.offset - |
1337 | extent_offset, disk_bytenr)) | |
17d217fe | 1338 | goto out_check; |
5d4f98a2 | 1339 | disk_bytenr += extent_offset; |
17d217fe YZ |
1340 | disk_bytenr += cur_offset - found_key.offset; |
1341 | num_bytes = min(end + 1, extent_end) - cur_offset; | |
e9894fd3 WS |
1342 | /* |
1343 | * if there are pending snapshots for this root, | |
1344 | * we fall into common COW way. | |
1345 | */ | |
1346 | if (!nolock) { | |
9ea24bbe | 1347 | err = btrfs_start_write_no_snapshoting(root); |
e9894fd3 WS |
1348 | if (!err) |
1349 | goto out_check; | |
1350 | } | |
17d217fe YZ |
1351 | /* |
1352 | * force cow if csum exists in the range. | |
1353 | * this ensure that csum for a given extent are | |
1354 | * either valid or do not exist. | |
1355 | */ | |
1356 | if (csum_exist_in_range(root, disk_bytenr, num_bytes)) | |
1357 | goto out_check; | |
80ff3856 YZ |
1358 | nocow = 1; |
1359 | } else if (extent_type == BTRFS_FILE_EXTENT_INLINE) { | |
1360 | extent_end = found_key.offset + | |
514ac8ad CM |
1361 | btrfs_file_extent_inline_len(leaf, |
1362 | path->slots[0], fi); | |
80ff3856 YZ |
1363 | extent_end = ALIGN(extent_end, root->sectorsize); |
1364 | } else { | |
1365 | BUG_ON(1); | |
1366 | } | |
1367 | out_check: | |
1368 | if (extent_end <= start) { | |
1369 | path->slots[0]++; | |
e9894fd3 | 1370 | if (!nolock && nocow) |
9ea24bbe | 1371 | btrfs_end_write_no_snapshoting(root); |
80ff3856 YZ |
1372 | goto next_slot; |
1373 | } | |
1374 | if (!nocow) { | |
1375 | if (cow_start == (u64)-1) | |
1376 | cow_start = cur_offset; | |
1377 | cur_offset = extent_end; | |
1378 | if (cur_offset > end) | |
1379 | break; | |
1380 | path->slots[0]++; | |
1381 | goto next_slot; | |
7ea394f1 YZ |
1382 | } |
1383 | ||
b3b4aa74 | 1384 | btrfs_release_path(path); |
80ff3856 | 1385 | if (cow_start != (u64)-1) { |
00361589 JB |
1386 | ret = cow_file_range(inode, locked_page, |
1387 | cow_start, found_key.offset - 1, | |
1388 | page_started, nr_written, 1); | |
e9894fd3 WS |
1389 | if (ret) { |
1390 | if (!nolock && nocow) | |
9ea24bbe | 1391 | btrfs_end_write_no_snapshoting(root); |
79787eaa | 1392 | goto error; |
e9894fd3 | 1393 | } |
80ff3856 | 1394 | cow_start = (u64)-1; |
7ea394f1 | 1395 | } |
80ff3856 | 1396 | |
d899e052 YZ |
1397 | if (extent_type == BTRFS_FILE_EXTENT_PREALLOC) { |
1398 | struct extent_map *em; | |
1399 | struct extent_map_tree *em_tree; | |
1400 | em_tree = &BTRFS_I(inode)->extent_tree; | |
172ddd60 | 1401 | em = alloc_extent_map(); |
79787eaa | 1402 | BUG_ON(!em); /* -ENOMEM */ |
d899e052 | 1403 | em->start = cur_offset; |
70c8a91c | 1404 | em->orig_start = found_key.offset - extent_offset; |
d899e052 YZ |
1405 | em->len = num_bytes; |
1406 | em->block_len = num_bytes; | |
1407 | em->block_start = disk_bytenr; | |
b4939680 | 1408 | em->orig_block_len = disk_num_bytes; |
cc95bef6 | 1409 | em->ram_bytes = ram_bytes; |
d899e052 | 1410 | em->bdev = root->fs_info->fs_devices->latest_bdev; |
2ab28f32 JB |
1411 | em->mod_start = em->start; |
1412 | em->mod_len = em->len; | |
d899e052 | 1413 | set_bit(EXTENT_FLAG_PINNED, &em->flags); |
b11e234d | 1414 | set_bit(EXTENT_FLAG_FILLING, &em->flags); |
70c8a91c | 1415 | em->generation = -1; |
d899e052 | 1416 | while (1) { |
890871be | 1417 | write_lock(&em_tree->lock); |
09a2a8f9 | 1418 | ret = add_extent_mapping(em_tree, em, 1); |
890871be | 1419 | write_unlock(&em_tree->lock); |
d899e052 YZ |
1420 | if (ret != -EEXIST) { |
1421 | free_extent_map(em); | |
1422 | break; | |
1423 | } | |
1424 | btrfs_drop_extent_cache(inode, em->start, | |
1425 | em->start + em->len - 1, 0); | |
1426 | } | |
1427 | type = BTRFS_ORDERED_PREALLOC; | |
1428 | } else { | |
1429 | type = BTRFS_ORDERED_NOCOW; | |
1430 | } | |
80ff3856 YZ |
1431 | |
1432 | ret = btrfs_add_ordered_extent(inode, cur_offset, disk_bytenr, | |
d899e052 | 1433 | num_bytes, num_bytes, type); |
79787eaa | 1434 | BUG_ON(ret); /* -ENOMEM */ |
771ed689 | 1435 | |
efa56464 YZ |
1436 | if (root->root_key.objectid == |
1437 | BTRFS_DATA_RELOC_TREE_OBJECTID) { | |
1438 | ret = btrfs_reloc_clone_csums(inode, cur_offset, | |
1439 | num_bytes); | |
e9894fd3 WS |
1440 | if (ret) { |
1441 | if (!nolock && nocow) | |
9ea24bbe | 1442 | btrfs_end_write_no_snapshoting(root); |
79787eaa | 1443 | goto error; |
e9894fd3 | 1444 | } |
efa56464 YZ |
1445 | } |
1446 | ||
c2790a2e JB |
1447 | extent_clear_unlock_delalloc(inode, cur_offset, |
1448 | cur_offset + num_bytes - 1, | |
1449 | locked_page, EXTENT_LOCKED | | |
1450 | EXTENT_DELALLOC, PAGE_UNLOCK | | |
1451 | PAGE_SET_PRIVATE2); | |
e9894fd3 | 1452 | if (!nolock && nocow) |
9ea24bbe | 1453 | btrfs_end_write_no_snapshoting(root); |
80ff3856 YZ |
1454 | cur_offset = extent_end; |
1455 | if (cur_offset > end) | |
1456 | break; | |
be20aa9d | 1457 | } |
b3b4aa74 | 1458 | btrfs_release_path(path); |
80ff3856 | 1459 | |
17ca04af | 1460 | if (cur_offset <= end && cow_start == (u64)-1) { |
80ff3856 | 1461 | cow_start = cur_offset; |
17ca04af JB |
1462 | cur_offset = end; |
1463 | } | |
1464 | ||
80ff3856 | 1465 | if (cow_start != (u64)-1) { |
00361589 JB |
1466 | ret = cow_file_range(inode, locked_page, cow_start, end, |
1467 | page_started, nr_written, 1); | |
d788a349 | 1468 | if (ret) |
79787eaa | 1469 | goto error; |
80ff3856 YZ |
1470 | } |
1471 | ||
79787eaa | 1472 | error: |
a698d075 | 1473 | err = btrfs_end_transaction(trans, root); |
79787eaa JM |
1474 | if (!ret) |
1475 | ret = err; | |
1476 | ||
17ca04af | 1477 | if (ret && cur_offset < end) |
c2790a2e JB |
1478 | extent_clear_unlock_delalloc(inode, cur_offset, end, |
1479 | locked_page, EXTENT_LOCKED | | |
151a41bc JB |
1480 | EXTENT_DELALLOC | EXTENT_DEFRAG | |
1481 | EXTENT_DO_ACCOUNTING, PAGE_UNLOCK | | |
1482 | PAGE_CLEAR_DIRTY | | |
c2790a2e JB |
1483 | PAGE_SET_WRITEBACK | |
1484 | PAGE_END_WRITEBACK); | |
7ea394f1 | 1485 | btrfs_free_path(path); |
79787eaa | 1486 | return ret; |
be20aa9d CM |
1487 | } |
1488 | ||
47059d93 WS |
1489 | static inline int need_force_cow(struct inode *inode, u64 start, u64 end) |
1490 | { | |
1491 | ||
1492 | if (!(BTRFS_I(inode)->flags & BTRFS_INODE_NODATACOW) && | |
1493 | !(BTRFS_I(inode)->flags & BTRFS_INODE_PREALLOC)) | |
1494 | return 0; | |
1495 | ||
1496 | /* | |
1497 | * @defrag_bytes is a hint value, no spinlock held here, | |
1498 | * if is not zero, it means the file is defragging. | |
1499 | * Force cow if given extent needs to be defragged. | |
1500 | */ | |
1501 | if (BTRFS_I(inode)->defrag_bytes && | |
1502 | test_range_bit(&BTRFS_I(inode)->io_tree, start, end, | |
1503 | EXTENT_DEFRAG, 0, NULL)) | |
1504 | return 1; | |
1505 | ||
1506 | return 0; | |
1507 | } | |
1508 | ||
d352ac68 CM |
1509 | /* |
1510 | * extent_io.c call back to do delayed allocation processing | |
1511 | */ | |
c8b97818 | 1512 | static int run_delalloc_range(struct inode *inode, struct page *locked_page, |
771ed689 CM |
1513 | u64 start, u64 end, int *page_started, |
1514 | unsigned long *nr_written) | |
be20aa9d | 1515 | { |
be20aa9d | 1516 | int ret; |
47059d93 | 1517 | int force_cow = need_force_cow(inode, start, end); |
a2135011 | 1518 | |
47059d93 | 1519 | if (BTRFS_I(inode)->flags & BTRFS_INODE_NODATACOW && !force_cow) { |
c8b97818 | 1520 | ret = run_delalloc_nocow(inode, locked_page, start, end, |
d397712b | 1521 | page_started, 1, nr_written); |
47059d93 | 1522 | } else if (BTRFS_I(inode)->flags & BTRFS_INODE_PREALLOC && !force_cow) { |
d899e052 | 1523 | ret = run_delalloc_nocow(inode, locked_page, start, end, |
d397712b | 1524 | page_started, 0, nr_written); |
7816030e | 1525 | } else if (!inode_need_compress(inode)) { |
7f366cfe CM |
1526 | ret = cow_file_range(inode, locked_page, start, end, |
1527 | page_started, nr_written, 1); | |
7ddf5a42 JB |
1528 | } else { |
1529 | set_bit(BTRFS_INODE_HAS_ASYNC_EXTENT, | |
1530 | &BTRFS_I(inode)->runtime_flags); | |
771ed689 | 1531 | ret = cow_file_range_async(inode, locked_page, start, end, |
d397712b | 1532 | page_started, nr_written); |
7ddf5a42 | 1533 | } |
b888db2b CM |
1534 | return ret; |
1535 | } | |
1536 | ||
1bf85046 JM |
1537 | static void btrfs_split_extent_hook(struct inode *inode, |
1538 | struct extent_state *orig, u64 split) | |
9ed74f2d | 1539 | { |
dcab6a3b JB |
1540 | u64 size; |
1541 | ||
0ca1f7ce | 1542 | /* not delalloc, ignore it */ |
9ed74f2d | 1543 | if (!(orig->state & EXTENT_DELALLOC)) |
1bf85046 | 1544 | return; |
9ed74f2d | 1545 | |
dcab6a3b JB |
1546 | size = orig->end - orig->start + 1; |
1547 | if (size > BTRFS_MAX_EXTENT_SIZE) { | |
1548 | u64 num_extents; | |
1549 | u64 new_size; | |
1550 | ||
1551 | /* | |
ba117213 JB |
1552 | * See the explanation in btrfs_merge_extent_hook, the same |
1553 | * applies here, just in reverse. | |
dcab6a3b JB |
1554 | */ |
1555 | new_size = orig->end - split + 1; | |
ba117213 | 1556 | num_extents = div64_u64(new_size + BTRFS_MAX_EXTENT_SIZE - 1, |
dcab6a3b | 1557 | BTRFS_MAX_EXTENT_SIZE); |
ba117213 JB |
1558 | new_size = split - orig->start; |
1559 | num_extents += div64_u64(new_size + BTRFS_MAX_EXTENT_SIZE - 1, | |
1560 | BTRFS_MAX_EXTENT_SIZE); | |
1561 | if (div64_u64(size + BTRFS_MAX_EXTENT_SIZE - 1, | |
1562 | BTRFS_MAX_EXTENT_SIZE) >= num_extents) | |
dcab6a3b JB |
1563 | return; |
1564 | } | |
1565 | ||
9e0baf60 JB |
1566 | spin_lock(&BTRFS_I(inode)->lock); |
1567 | BTRFS_I(inode)->outstanding_extents++; | |
1568 | spin_unlock(&BTRFS_I(inode)->lock); | |
9ed74f2d JB |
1569 | } |
1570 | ||
1571 | /* | |
1572 | * extent_io.c merge_extent_hook, used to track merged delayed allocation | |
1573 | * extents so we can keep track of new extents that are just merged onto old | |
1574 | * extents, such as when we are doing sequential writes, so we can properly | |
1575 | * account for the metadata space we'll need. | |
1576 | */ | |
1bf85046 JM |
1577 | static void btrfs_merge_extent_hook(struct inode *inode, |
1578 | struct extent_state *new, | |
1579 | struct extent_state *other) | |
9ed74f2d | 1580 | { |
dcab6a3b JB |
1581 | u64 new_size, old_size; |
1582 | u64 num_extents; | |
1583 | ||
9ed74f2d JB |
1584 | /* not delalloc, ignore it */ |
1585 | if (!(other->state & EXTENT_DELALLOC)) | |
1bf85046 | 1586 | return; |
9ed74f2d | 1587 | |
8461a3de JB |
1588 | if (new->start > other->start) |
1589 | new_size = new->end - other->start + 1; | |
1590 | else | |
1591 | new_size = other->end - new->start + 1; | |
dcab6a3b JB |
1592 | |
1593 | /* we're not bigger than the max, unreserve the space and go */ | |
1594 | if (new_size <= BTRFS_MAX_EXTENT_SIZE) { | |
1595 | spin_lock(&BTRFS_I(inode)->lock); | |
1596 | BTRFS_I(inode)->outstanding_extents--; | |
1597 | spin_unlock(&BTRFS_I(inode)->lock); | |
1598 | return; | |
1599 | } | |
1600 | ||
1601 | /* | |
ba117213 JB |
1602 | * We have to add up either side to figure out how many extents were |
1603 | * accounted for before we merged into one big extent. If the number of | |
1604 | * extents we accounted for is <= the amount we need for the new range | |
1605 | * then we can return, otherwise drop. Think of it like this | |
1606 | * | |
1607 | * [ 4k][MAX_SIZE] | |
1608 | * | |
1609 | * So we've grown the extent by a MAX_SIZE extent, this would mean we | |
1610 | * need 2 outstanding extents, on one side we have 1 and the other side | |
1611 | * we have 1 so they are == and we can return. But in this case | |
1612 | * | |
1613 | * [MAX_SIZE+4k][MAX_SIZE+4k] | |
1614 | * | |
1615 | * Each range on their own accounts for 2 extents, but merged together | |
1616 | * they are only 3 extents worth of accounting, so we need to drop in | |
1617 | * this case. | |
dcab6a3b | 1618 | */ |
ba117213 | 1619 | old_size = other->end - other->start + 1; |
dcab6a3b JB |
1620 | num_extents = div64_u64(old_size + BTRFS_MAX_EXTENT_SIZE - 1, |
1621 | BTRFS_MAX_EXTENT_SIZE); | |
ba117213 JB |
1622 | old_size = new->end - new->start + 1; |
1623 | num_extents += div64_u64(old_size + BTRFS_MAX_EXTENT_SIZE - 1, | |
1624 | BTRFS_MAX_EXTENT_SIZE); | |
1625 | ||
dcab6a3b | 1626 | if (div64_u64(new_size + BTRFS_MAX_EXTENT_SIZE - 1, |
ba117213 | 1627 | BTRFS_MAX_EXTENT_SIZE) >= num_extents) |
dcab6a3b JB |
1628 | return; |
1629 | ||
9e0baf60 JB |
1630 | spin_lock(&BTRFS_I(inode)->lock); |
1631 | BTRFS_I(inode)->outstanding_extents--; | |
1632 | spin_unlock(&BTRFS_I(inode)->lock); | |
9ed74f2d JB |
1633 | } |
1634 | ||
eb73c1b7 MX |
1635 | static void btrfs_add_delalloc_inodes(struct btrfs_root *root, |
1636 | struct inode *inode) | |
1637 | { | |
1638 | spin_lock(&root->delalloc_lock); | |
1639 | if (list_empty(&BTRFS_I(inode)->delalloc_inodes)) { | |
1640 | list_add_tail(&BTRFS_I(inode)->delalloc_inodes, | |
1641 | &root->delalloc_inodes); | |
1642 | set_bit(BTRFS_INODE_IN_DELALLOC_LIST, | |
1643 | &BTRFS_I(inode)->runtime_flags); | |
1644 | root->nr_delalloc_inodes++; | |
1645 | if (root->nr_delalloc_inodes == 1) { | |
1646 | spin_lock(&root->fs_info->delalloc_root_lock); | |
1647 | BUG_ON(!list_empty(&root->delalloc_root)); | |
1648 | list_add_tail(&root->delalloc_root, | |
1649 | &root->fs_info->delalloc_roots); | |
1650 | spin_unlock(&root->fs_info->delalloc_root_lock); | |
1651 | } | |
1652 | } | |
1653 | spin_unlock(&root->delalloc_lock); | |
1654 | } | |
1655 | ||
1656 | static void btrfs_del_delalloc_inode(struct btrfs_root *root, | |
1657 | struct inode *inode) | |
1658 | { | |
1659 | spin_lock(&root->delalloc_lock); | |
1660 | if (!list_empty(&BTRFS_I(inode)->delalloc_inodes)) { | |
1661 | list_del_init(&BTRFS_I(inode)->delalloc_inodes); | |
1662 | clear_bit(BTRFS_INODE_IN_DELALLOC_LIST, | |
1663 | &BTRFS_I(inode)->runtime_flags); | |
1664 | root->nr_delalloc_inodes--; | |
1665 | if (!root->nr_delalloc_inodes) { | |
1666 | spin_lock(&root->fs_info->delalloc_root_lock); | |
1667 | BUG_ON(list_empty(&root->delalloc_root)); | |
1668 | list_del_init(&root->delalloc_root); | |
1669 | spin_unlock(&root->fs_info->delalloc_root_lock); | |
1670 | } | |
1671 | } | |
1672 | spin_unlock(&root->delalloc_lock); | |
1673 | } | |
1674 | ||
d352ac68 CM |
1675 | /* |
1676 | * extent_io.c set_bit_hook, used to track delayed allocation | |
1677 | * bytes in this file, and to maintain the list of inodes that | |
1678 | * have pending delalloc work to be done. | |
1679 | */ | |
1bf85046 | 1680 | static void btrfs_set_bit_hook(struct inode *inode, |
9ee49a04 | 1681 | struct extent_state *state, unsigned *bits) |
291d673e | 1682 | { |
9ed74f2d | 1683 | |
47059d93 WS |
1684 | if ((*bits & EXTENT_DEFRAG) && !(*bits & EXTENT_DELALLOC)) |
1685 | WARN_ON(1); | |
75eff68e CM |
1686 | /* |
1687 | * set_bit and clear bit hooks normally require _irqsave/restore | |
27160b6b | 1688 | * but in this case, we are only testing for the DELALLOC |
75eff68e CM |
1689 | * bit, which is only set or cleared with irqs on |
1690 | */ | |
0ca1f7ce | 1691 | if (!(state->state & EXTENT_DELALLOC) && (*bits & EXTENT_DELALLOC)) { |
291d673e | 1692 | struct btrfs_root *root = BTRFS_I(inode)->root; |
0ca1f7ce | 1693 | u64 len = state->end + 1 - state->start; |
83eea1f1 | 1694 | bool do_list = !btrfs_is_free_space_inode(inode); |
9ed74f2d | 1695 | |
9e0baf60 | 1696 | if (*bits & EXTENT_FIRST_DELALLOC) { |
0ca1f7ce | 1697 | *bits &= ~EXTENT_FIRST_DELALLOC; |
9e0baf60 JB |
1698 | } else { |
1699 | spin_lock(&BTRFS_I(inode)->lock); | |
1700 | BTRFS_I(inode)->outstanding_extents++; | |
1701 | spin_unlock(&BTRFS_I(inode)->lock); | |
1702 | } | |
287a0ab9 | 1703 | |
6a3891c5 JB |
1704 | /* For sanity tests */ |
1705 | if (btrfs_test_is_dummy_root(root)) | |
1706 | return; | |
1707 | ||
963d678b MX |
1708 | __percpu_counter_add(&root->fs_info->delalloc_bytes, len, |
1709 | root->fs_info->delalloc_batch); | |
df0af1a5 | 1710 | spin_lock(&BTRFS_I(inode)->lock); |
0ca1f7ce | 1711 | BTRFS_I(inode)->delalloc_bytes += len; |
47059d93 WS |
1712 | if (*bits & EXTENT_DEFRAG) |
1713 | BTRFS_I(inode)->defrag_bytes += len; | |
df0af1a5 | 1714 | if (do_list && !test_bit(BTRFS_INODE_IN_DELALLOC_LIST, |
eb73c1b7 MX |
1715 | &BTRFS_I(inode)->runtime_flags)) |
1716 | btrfs_add_delalloc_inodes(root, inode); | |
df0af1a5 | 1717 | spin_unlock(&BTRFS_I(inode)->lock); |
291d673e | 1718 | } |
291d673e CM |
1719 | } |
1720 | ||
d352ac68 CM |
1721 | /* |
1722 | * extent_io.c clear_bit_hook, see set_bit_hook for why | |
1723 | */ | |
1bf85046 | 1724 | static void btrfs_clear_bit_hook(struct inode *inode, |
41074888 | 1725 | struct extent_state *state, |
9ee49a04 | 1726 | unsigned *bits) |
291d673e | 1727 | { |
47059d93 | 1728 | u64 len = state->end + 1 - state->start; |
dcab6a3b JB |
1729 | u64 num_extents = div64_u64(len + BTRFS_MAX_EXTENT_SIZE -1, |
1730 | BTRFS_MAX_EXTENT_SIZE); | |
47059d93 WS |
1731 | |
1732 | spin_lock(&BTRFS_I(inode)->lock); | |
1733 | if ((state->state & EXTENT_DEFRAG) && (*bits & EXTENT_DEFRAG)) | |
1734 | BTRFS_I(inode)->defrag_bytes -= len; | |
1735 | spin_unlock(&BTRFS_I(inode)->lock); | |
1736 | ||
75eff68e CM |
1737 | /* |
1738 | * set_bit and clear bit hooks normally require _irqsave/restore | |
27160b6b | 1739 | * but in this case, we are only testing for the DELALLOC |
75eff68e CM |
1740 | * bit, which is only set or cleared with irqs on |
1741 | */ | |
0ca1f7ce | 1742 | if ((state->state & EXTENT_DELALLOC) && (*bits & EXTENT_DELALLOC)) { |
291d673e | 1743 | struct btrfs_root *root = BTRFS_I(inode)->root; |
83eea1f1 | 1744 | bool do_list = !btrfs_is_free_space_inode(inode); |
bcbfce8a | 1745 | |
9e0baf60 | 1746 | if (*bits & EXTENT_FIRST_DELALLOC) { |
0ca1f7ce | 1747 | *bits &= ~EXTENT_FIRST_DELALLOC; |
9e0baf60 JB |
1748 | } else if (!(*bits & EXTENT_DO_ACCOUNTING)) { |
1749 | spin_lock(&BTRFS_I(inode)->lock); | |
dcab6a3b | 1750 | BTRFS_I(inode)->outstanding_extents -= num_extents; |
9e0baf60 JB |
1751 | spin_unlock(&BTRFS_I(inode)->lock); |
1752 | } | |
0ca1f7ce | 1753 | |
b6d08f06 JB |
1754 | /* |
1755 | * We don't reserve metadata space for space cache inodes so we | |
1756 | * don't need to call dellalloc_release_metadata if there is an | |
1757 | * error. | |
1758 | */ | |
1759 | if (*bits & EXTENT_DO_ACCOUNTING && | |
1760 | root != root->fs_info->tree_root) | |
0ca1f7ce YZ |
1761 | btrfs_delalloc_release_metadata(inode, len); |
1762 | ||
6a3891c5 JB |
1763 | /* For sanity tests. */ |
1764 | if (btrfs_test_is_dummy_root(root)) | |
1765 | return; | |
1766 | ||
0cb59c99 | 1767 | if (root->root_key.objectid != BTRFS_DATA_RELOC_TREE_OBJECTID |
7ee9e440 | 1768 | && do_list && !(state->state & EXTENT_NORESERVE)) |
0ca1f7ce | 1769 | btrfs_free_reserved_data_space(inode, len); |
9ed74f2d | 1770 | |
963d678b MX |
1771 | __percpu_counter_add(&root->fs_info->delalloc_bytes, -len, |
1772 | root->fs_info->delalloc_batch); | |
df0af1a5 | 1773 | spin_lock(&BTRFS_I(inode)->lock); |
0ca1f7ce | 1774 | BTRFS_I(inode)->delalloc_bytes -= len; |
0cb59c99 | 1775 | if (do_list && BTRFS_I(inode)->delalloc_bytes == 0 && |
df0af1a5 | 1776 | test_bit(BTRFS_INODE_IN_DELALLOC_LIST, |
eb73c1b7 MX |
1777 | &BTRFS_I(inode)->runtime_flags)) |
1778 | btrfs_del_delalloc_inode(root, inode); | |
df0af1a5 | 1779 | spin_unlock(&BTRFS_I(inode)->lock); |
291d673e | 1780 | } |
291d673e CM |
1781 | } |
1782 | ||
d352ac68 CM |
1783 | /* |
1784 | * extent_io.c merge_bio_hook, this must check the chunk tree to make sure | |
1785 | * we don't create bios that span stripes or chunks | |
1786 | */ | |
64a16701 | 1787 | int btrfs_merge_bio_hook(int rw, struct page *page, unsigned long offset, |
c8b97818 CM |
1788 | size_t size, struct bio *bio, |
1789 | unsigned long bio_flags) | |
239b14b3 CM |
1790 | { |
1791 | struct btrfs_root *root = BTRFS_I(page->mapping->host)->root; | |
4f024f37 | 1792 | u64 logical = (u64)bio->bi_iter.bi_sector << 9; |
239b14b3 CM |
1793 | u64 length = 0; |
1794 | u64 map_length; | |
239b14b3 CM |
1795 | int ret; |
1796 | ||
771ed689 CM |
1797 | if (bio_flags & EXTENT_BIO_COMPRESSED) |
1798 | return 0; | |
1799 | ||
4f024f37 | 1800 | length = bio->bi_iter.bi_size; |
239b14b3 | 1801 | map_length = length; |
64a16701 | 1802 | ret = btrfs_map_block(root->fs_info, rw, logical, |
f188591e | 1803 | &map_length, NULL, 0); |
3ec706c8 | 1804 | /* Will always return 0 with map_multi == NULL */ |
3444a972 | 1805 | BUG_ON(ret < 0); |
d397712b | 1806 | if (map_length < length + size) |
239b14b3 | 1807 | return 1; |
3444a972 | 1808 | return 0; |
239b14b3 CM |
1809 | } |
1810 | ||
d352ac68 CM |
1811 | /* |
1812 | * in order to insert checksums into the metadata in large chunks, | |
1813 | * we wait until bio submission time. All the pages in the bio are | |
1814 | * checksummed and sums are attached onto the ordered extent record. | |
1815 | * | |
1816 | * At IO completion time the cums attached on the ordered extent record | |
1817 | * are inserted into the btree | |
1818 | */ | |
d397712b CM |
1819 | static int __btrfs_submit_bio_start(struct inode *inode, int rw, |
1820 | struct bio *bio, int mirror_num, | |
eaf25d93 CM |
1821 | unsigned long bio_flags, |
1822 | u64 bio_offset) | |
065631f6 | 1823 | { |
065631f6 | 1824 | struct btrfs_root *root = BTRFS_I(inode)->root; |
065631f6 | 1825 | int ret = 0; |
e015640f | 1826 | |
d20f7043 | 1827 | ret = btrfs_csum_one_bio(root, inode, bio, 0, 0); |
79787eaa | 1828 | BUG_ON(ret); /* -ENOMEM */ |
4a69a410 CM |
1829 | return 0; |
1830 | } | |
e015640f | 1831 | |
4a69a410 CM |
1832 | /* |
1833 | * in order to insert checksums into the metadata in large chunks, | |
1834 | * we wait until bio submission time. All the pages in the bio are | |
1835 | * checksummed and sums are attached onto the ordered extent record. | |
1836 | * | |
1837 | * At IO completion time the cums attached on the ordered extent record | |
1838 | * are inserted into the btree | |
1839 | */ | |
b2950863 | 1840 | static int __btrfs_submit_bio_done(struct inode *inode, int rw, struct bio *bio, |
eaf25d93 CM |
1841 | int mirror_num, unsigned long bio_flags, |
1842 | u64 bio_offset) | |
4a69a410 CM |
1843 | { |
1844 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
61891923 SB |
1845 | int ret; |
1846 | ||
1847 | ret = btrfs_map_bio(root, rw, bio, mirror_num, 1); | |
1848 | if (ret) | |
1849 | bio_endio(bio, ret); | |
1850 | return ret; | |
44b8bd7e CM |
1851 | } |
1852 | ||
d352ac68 | 1853 | /* |
cad321ad CM |
1854 | * extent_io.c submission hook. This does the right thing for csum calculation |
1855 | * on write, or reading the csums from the tree before a read | |
d352ac68 | 1856 | */ |
b2950863 | 1857 | static int btrfs_submit_bio_hook(struct inode *inode, int rw, struct bio *bio, |
eaf25d93 CM |
1858 | int mirror_num, unsigned long bio_flags, |
1859 | u64 bio_offset) | |
44b8bd7e CM |
1860 | { |
1861 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
1862 | int ret = 0; | |
19b9bdb0 | 1863 | int skip_sum; |
0417341e | 1864 | int metadata = 0; |
b812ce28 | 1865 | int async = !atomic_read(&BTRFS_I(inode)->sync_writers); |
44b8bd7e | 1866 | |
6cbff00f | 1867 | skip_sum = BTRFS_I(inode)->flags & BTRFS_INODE_NODATASUM; |
cad321ad | 1868 | |
83eea1f1 | 1869 | if (btrfs_is_free_space_inode(inode)) |
0417341e JM |
1870 | metadata = 2; |
1871 | ||
7b6d91da | 1872 | if (!(rw & REQ_WRITE)) { |
5fd02043 JB |
1873 | ret = btrfs_bio_wq_end_io(root->fs_info, bio, metadata); |
1874 | if (ret) | |
61891923 | 1875 | goto out; |
5fd02043 | 1876 | |
d20f7043 | 1877 | if (bio_flags & EXTENT_BIO_COMPRESSED) { |
61891923 SB |
1878 | ret = btrfs_submit_compressed_read(inode, bio, |
1879 | mirror_num, | |
1880 | bio_flags); | |
1881 | goto out; | |
c2db1073 TI |
1882 | } else if (!skip_sum) { |
1883 | ret = btrfs_lookup_bio_sums(root, inode, bio, NULL); | |
1884 | if (ret) | |
61891923 | 1885 | goto out; |
c2db1073 | 1886 | } |
4d1b5fb4 | 1887 | goto mapit; |
b812ce28 | 1888 | } else if (async && !skip_sum) { |
17d217fe YZ |
1889 | /* csum items have already been cloned */ |
1890 | if (root->root_key.objectid == BTRFS_DATA_RELOC_TREE_OBJECTID) | |
1891 | goto mapit; | |
19b9bdb0 | 1892 | /* we're doing a write, do the async checksumming */ |
61891923 | 1893 | ret = btrfs_wq_submit_bio(BTRFS_I(inode)->root->fs_info, |
44b8bd7e | 1894 | inode, rw, bio, mirror_num, |
eaf25d93 CM |
1895 | bio_flags, bio_offset, |
1896 | __btrfs_submit_bio_start, | |
4a69a410 | 1897 | __btrfs_submit_bio_done); |
61891923 | 1898 | goto out; |
b812ce28 JB |
1899 | } else if (!skip_sum) { |
1900 | ret = btrfs_csum_one_bio(root, inode, bio, 0, 0); | |
1901 | if (ret) | |
1902 | goto out; | |
19b9bdb0 CM |
1903 | } |
1904 | ||
0b86a832 | 1905 | mapit: |
61891923 SB |
1906 | ret = btrfs_map_bio(root, rw, bio, mirror_num, 0); |
1907 | ||
1908 | out: | |
1909 | if (ret < 0) | |
1910 | bio_endio(bio, ret); | |
1911 | return ret; | |
065631f6 | 1912 | } |
6885f308 | 1913 | |
d352ac68 CM |
1914 | /* |
1915 | * given a list of ordered sums record them in the inode. This happens | |
1916 | * at IO completion time based on sums calculated at bio submission time. | |
1917 | */ | |
ba1da2f4 | 1918 | static noinline int add_pending_csums(struct btrfs_trans_handle *trans, |
e6dcd2dc CM |
1919 | struct inode *inode, u64 file_offset, |
1920 | struct list_head *list) | |
1921 | { | |
e6dcd2dc CM |
1922 | struct btrfs_ordered_sum *sum; |
1923 | ||
c6e30871 | 1924 | list_for_each_entry(sum, list, list) { |
39847c4d | 1925 | trans->adding_csums = 1; |
d20f7043 CM |
1926 | btrfs_csum_file_blocks(trans, |
1927 | BTRFS_I(inode)->root->fs_info->csum_root, sum); | |
39847c4d | 1928 | trans->adding_csums = 0; |
e6dcd2dc CM |
1929 | } |
1930 | return 0; | |
1931 | } | |
1932 | ||
2ac55d41 JB |
1933 | int btrfs_set_extent_delalloc(struct inode *inode, u64 start, u64 end, |
1934 | struct extent_state **cached_state) | |
ea8c2819 | 1935 | { |
6c1500f2 | 1936 | WARN_ON((end & (PAGE_CACHE_SIZE - 1)) == 0); |
ea8c2819 | 1937 | return set_extent_delalloc(&BTRFS_I(inode)->io_tree, start, end, |
2ac55d41 | 1938 | cached_state, GFP_NOFS); |
ea8c2819 CM |
1939 | } |
1940 | ||
d352ac68 | 1941 | /* see btrfs_writepage_start_hook for details on why this is required */ |
247e743c CM |
1942 | struct btrfs_writepage_fixup { |
1943 | struct page *page; | |
1944 | struct btrfs_work work; | |
1945 | }; | |
1946 | ||
b2950863 | 1947 | static void btrfs_writepage_fixup_worker(struct btrfs_work *work) |
247e743c CM |
1948 | { |
1949 | struct btrfs_writepage_fixup *fixup; | |
1950 | struct btrfs_ordered_extent *ordered; | |
2ac55d41 | 1951 | struct extent_state *cached_state = NULL; |
247e743c CM |
1952 | struct page *page; |
1953 | struct inode *inode; | |
1954 | u64 page_start; | |
1955 | u64 page_end; | |
87826df0 | 1956 | int ret; |
247e743c CM |
1957 | |
1958 | fixup = container_of(work, struct btrfs_writepage_fixup, work); | |
1959 | page = fixup->page; | |
4a096752 | 1960 | again: |
247e743c CM |
1961 | lock_page(page); |
1962 | if (!page->mapping || !PageDirty(page) || !PageChecked(page)) { | |
1963 | ClearPageChecked(page); | |
1964 | goto out_page; | |
1965 | } | |
1966 | ||
1967 | inode = page->mapping->host; | |
1968 | page_start = page_offset(page); | |
1969 | page_end = page_offset(page) + PAGE_CACHE_SIZE - 1; | |
1970 | ||
2ac55d41 | 1971 | lock_extent_bits(&BTRFS_I(inode)->io_tree, page_start, page_end, 0, |
d0082371 | 1972 | &cached_state); |
4a096752 CM |
1973 | |
1974 | /* already ordered? We're done */ | |
8b62b72b | 1975 | if (PagePrivate2(page)) |
247e743c | 1976 | goto out; |
4a096752 CM |
1977 | |
1978 | ordered = btrfs_lookup_ordered_extent(inode, page_start); | |
1979 | if (ordered) { | |
2ac55d41 JB |
1980 | unlock_extent_cached(&BTRFS_I(inode)->io_tree, page_start, |
1981 | page_end, &cached_state, GFP_NOFS); | |
4a096752 CM |
1982 | unlock_page(page); |
1983 | btrfs_start_ordered_extent(inode, ordered, 1); | |
87826df0 | 1984 | btrfs_put_ordered_extent(ordered); |
4a096752 CM |
1985 | goto again; |
1986 | } | |
247e743c | 1987 | |
87826df0 JM |
1988 | ret = btrfs_delalloc_reserve_space(inode, PAGE_CACHE_SIZE); |
1989 | if (ret) { | |
1990 | mapping_set_error(page->mapping, ret); | |
1991 | end_extent_writepage(page, ret, page_start, page_end); | |
1992 | ClearPageChecked(page); | |
1993 | goto out; | |
1994 | } | |
1995 | ||
2ac55d41 | 1996 | btrfs_set_extent_delalloc(inode, page_start, page_end, &cached_state); |
247e743c | 1997 | ClearPageChecked(page); |
87826df0 | 1998 | set_page_dirty(page); |
247e743c | 1999 | out: |
2ac55d41 JB |
2000 | unlock_extent_cached(&BTRFS_I(inode)->io_tree, page_start, page_end, |
2001 | &cached_state, GFP_NOFS); | |
247e743c CM |
2002 | out_page: |
2003 | unlock_page(page); | |
2004 | page_cache_release(page); | |
b897abec | 2005 | kfree(fixup); |
247e743c CM |
2006 | } |
2007 | ||
2008 | /* | |
2009 | * There are a few paths in the higher layers of the kernel that directly | |
2010 | * set the page dirty bit without asking the filesystem if it is a | |
2011 | * good idea. This causes problems because we want to make sure COW | |
2012 | * properly happens and the data=ordered rules are followed. | |
2013 | * | |
c8b97818 | 2014 | * In our case any range that doesn't have the ORDERED bit set |
247e743c CM |
2015 | * hasn't been properly setup for IO. We kick off an async process |
2016 | * to fix it up. The async helper will wait for ordered extents, set | |
2017 | * the delalloc bit and make it safe to write the page. | |
2018 | */ | |
b2950863 | 2019 | static int btrfs_writepage_start_hook(struct page *page, u64 start, u64 end) |
247e743c CM |
2020 | { |
2021 | struct inode *inode = page->mapping->host; | |
2022 | struct btrfs_writepage_fixup *fixup; | |
2023 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
247e743c | 2024 | |
8b62b72b CM |
2025 | /* this page is properly in the ordered list */ |
2026 | if (TestClearPagePrivate2(page)) | |
247e743c CM |
2027 | return 0; |
2028 | ||
2029 | if (PageChecked(page)) | |
2030 | return -EAGAIN; | |
2031 | ||
2032 | fixup = kzalloc(sizeof(*fixup), GFP_NOFS); | |
2033 | if (!fixup) | |
2034 | return -EAGAIN; | |
f421950f | 2035 | |
247e743c CM |
2036 | SetPageChecked(page); |
2037 | page_cache_get(page); | |
9e0af237 LB |
2038 | btrfs_init_work(&fixup->work, btrfs_fixup_helper, |
2039 | btrfs_writepage_fixup_worker, NULL, NULL); | |
247e743c | 2040 | fixup->page = page; |
dc6e3209 | 2041 | btrfs_queue_work(root->fs_info->fixup_workers, &fixup->work); |
87826df0 | 2042 | return -EBUSY; |
247e743c CM |
2043 | } |
2044 | ||
d899e052 YZ |
2045 | static int insert_reserved_file_extent(struct btrfs_trans_handle *trans, |
2046 | struct inode *inode, u64 file_pos, | |
2047 | u64 disk_bytenr, u64 disk_num_bytes, | |
2048 | u64 num_bytes, u64 ram_bytes, | |
2049 | u8 compression, u8 encryption, | |
2050 | u16 other_encoding, int extent_type) | |
2051 | { | |
2052 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
2053 | struct btrfs_file_extent_item *fi; | |
2054 | struct btrfs_path *path; | |
2055 | struct extent_buffer *leaf; | |
2056 | struct btrfs_key ins; | |
1acae57b | 2057 | int extent_inserted = 0; |
d899e052 YZ |
2058 | int ret; |
2059 | ||
2060 | path = btrfs_alloc_path(); | |
d8926bb3 MF |
2061 | if (!path) |
2062 | return -ENOMEM; | |
d899e052 | 2063 | |
a1ed835e CM |
2064 | /* |
2065 | * we may be replacing one extent in the tree with another. | |
2066 | * The new extent is pinned in the extent map, and we don't want | |
2067 | * to drop it from the cache until it is completely in the btree. | |
2068 | * | |
2069 | * So, tell btrfs_drop_extents to leave this extent in the cache. | |
2070 | * the caller is expected to unpin it and allow it to be merged | |
2071 | * with the others. | |
2072 | */ | |
1acae57b FDBM |
2073 | ret = __btrfs_drop_extents(trans, root, inode, path, file_pos, |
2074 | file_pos + num_bytes, NULL, 0, | |
2075 | 1, sizeof(*fi), &extent_inserted); | |
79787eaa JM |
2076 | if (ret) |
2077 | goto out; | |
d899e052 | 2078 | |
1acae57b FDBM |
2079 | if (!extent_inserted) { |
2080 | ins.objectid = btrfs_ino(inode); | |
2081 | ins.offset = file_pos; | |
2082 | ins.type = BTRFS_EXTENT_DATA_KEY; | |
2083 | ||
2084 | path->leave_spinning = 1; | |
2085 | ret = btrfs_insert_empty_item(trans, root, path, &ins, | |
2086 | sizeof(*fi)); | |
2087 | if (ret) | |
2088 | goto out; | |
2089 | } | |
d899e052 YZ |
2090 | leaf = path->nodes[0]; |
2091 | fi = btrfs_item_ptr(leaf, path->slots[0], | |
2092 | struct btrfs_file_extent_item); | |
2093 | btrfs_set_file_extent_generation(leaf, fi, trans->transid); | |
2094 | btrfs_set_file_extent_type(leaf, fi, extent_type); | |
2095 | btrfs_set_file_extent_disk_bytenr(leaf, fi, disk_bytenr); | |
2096 | btrfs_set_file_extent_disk_num_bytes(leaf, fi, disk_num_bytes); | |
2097 | btrfs_set_file_extent_offset(leaf, fi, 0); | |
2098 | btrfs_set_file_extent_num_bytes(leaf, fi, num_bytes); | |
2099 | btrfs_set_file_extent_ram_bytes(leaf, fi, ram_bytes); | |
2100 | btrfs_set_file_extent_compression(leaf, fi, compression); | |
2101 | btrfs_set_file_extent_encryption(leaf, fi, encryption); | |
2102 | btrfs_set_file_extent_other_encoding(leaf, fi, other_encoding); | |
b9473439 | 2103 | |
d899e052 | 2104 | btrfs_mark_buffer_dirty(leaf); |
ce195332 | 2105 | btrfs_release_path(path); |
d899e052 YZ |
2106 | |
2107 | inode_add_bytes(inode, num_bytes); | |
d899e052 YZ |
2108 | |
2109 | ins.objectid = disk_bytenr; | |
2110 | ins.offset = disk_num_bytes; | |
2111 | ins.type = BTRFS_EXTENT_ITEM_KEY; | |
5d4f98a2 YZ |
2112 | ret = btrfs_alloc_reserved_file_extent(trans, root, |
2113 | root->root_key.objectid, | |
33345d01 | 2114 | btrfs_ino(inode), file_pos, &ins); |
79787eaa | 2115 | out: |
d899e052 | 2116 | btrfs_free_path(path); |
b9473439 | 2117 | |
79787eaa | 2118 | return ret; |
d899e052 YZ |
2119 | } |
2120 | ||
38c227d8 LB |
2121 | /* snapshot-aware defrag */ |
2122 | struct sa_defrag_extent_backref { | |
2123 | struct rb_node node; | |
2124 | struct old_sa_defrag_extent *old; | |
2125 | u64 root_id; | |
2126 | u64 inum; | |
2127 | u64 file_pos; | |
2128 | u64 extent_offset; | |
2129 | u64 num_bytes; | |
2130 | u64 generation; | |
2131 | }; | |
2132 | ||
2133 | struct old_sa_defrag_extent { | |
2134 | struct list_head list; | |
2135 | struct new_sa_defrag_extent *new; | |
2136 | ||
2137 | u64 extent_offset; | |
2138 | u64 bytenr; | |
2139 | u64 offset; | |
2140 | u64 len; | |
2141 | int count; | |
2142 | }; | |
2143 | ||
2144 | struct new_sa_defrag_extent { | |
2145 | struct rb_root root; | |
2146 | struct list_head head; | |
2147 | struct btrfs_path *path; | |
2148 | struct inode *inode; | |
2149 | u64 file_pos; | |
2150 | u64 len; | |
2151 | u64 bytenr; | |
2152 | u64 disk_len; | |
2153 | u8 compress_type; | |
2154 | }; | |
2155 | ||
2156 | static int backref_comp(struct sa_defrag_extent_backref *b1, | |
2157 | struct sa_defrag_extent_backref *b2) | |
2158 | { | |
2159 | if (b1->root_id < b2->root_id) | |
2160 | return -1; | |
2161 | else if (b1->root_id > b2->root_id) | |
2162 | return 1; | |
2163 | ||
2164 | if (b1->inum < b2->inum) | |
2165 | return -1; | |
2166 | else if (b1->inum > b2->inum) | |
2167 | return 1; | |
2168 | ||
2169 | if (b1->file_pos < b2->file_pos) | |
2170 | return -1; | |
2171 | else if (b1->file_pos > b2->file_pos) | |
2172 | return 1; | |
2173 | ||
2174 | /* | |
2175 | * [------------------------------] ===> (a range of space) | |
2176 | * |<--->| |<---->| =============> (fs/file tree A) | |
2177 | * |<---------------------------->| ===> (fs/file tree B) | |
2178 | * | |
2179 | * A range of space can refer to two file extents in one tree while | |
2180 | * refer to only one file extent in another tree. | |
2181 | * | |
2182 | * So we may process a disk offset more than one time(two extents in A) | |
2183 | * and locate at the same extent(one extent in B), then insert two same | |
2184 | * backrefs(both refer to the extent in B). | |
2185 | */ | |
2186 | return 0; | |
2187 | } | |
2188 | ||
2189 | static void backref_insert(struct rb_root *root, | |
2190 | struct sa_defrag_extent_backref *backref) | |
2191 | { | |
2192 | struct rb_node **p = &root->rb_node; | |
2193 | struct rb_node *parent = NULL; | |
2194 | struct sa_defrag_extent_backref *entry; | |
2195 | int ret; | |
2196 | ||
2197 | while (*p) { | |
2198 | parent = *p; | |
2199 | entry = rb_entry(parent, struct sa_defrag_extent_backref, node); | |
2200 | ||
2201 | ret = backref_comp(backref, entry); | |
2202 | if (ret < 0) | |
2203 | p = &(*p)->rb_left; | |
2204 | else | |
2205 | p = &(*p)->rb_right; | |
2206 | } | |
2207 | ||
2208 | rb_link_node(&backref->node, parent, p); | |
2209 | rb_insert_color(&backref->node, root); | |
2210 | } | |
2211 | ||
2212 | /* | |
2213 | * Note the backref might has changed, and in this case we just return 0. | |
2214 | */ | |
2215 | static noinline int record_one_backref(u64 inum, u64 offset, u64 root_id, | |
2216 | void *ctx) | |
2217 | { | |
2218 | struct btrfs_file_extent_item *extent; | |
2219 | struct btrfs_fs_info *fs_info; | |
2220 | struct old_sa_defrag_extent *old = ctx; | |
2221 | struct new_sa_defrag_extent *new = old->new; | |
2222 | struct btrfs_path *path = new->path; | |
2223 | struct btrfs_key key; | |
2224 | struct btrfs_root *root; | |
2225 | struct sa_defrag_extent_backref *backref; | |
2226 | struct extent_buffer *leaf; | |
2227 | struct inode *inode = new->inode; | |
2228 | int slot; | |
2229 | int ret; | |
2230 | u64 extent_offset; | |
2231 | u64 num_bytes; | |
2232 | ||
2233 | if (BTRFS_I(inode)->root->root_key.objectid == root_id && | |
2234 | inum == btrfs_ino(inode)) | |
2235 | return 0; | |
2236 | ||
2237 | key.objectid = root_id; | |
2238 | key.type = BTRFS_ROOT_ITEM_KEY; | |
2239 | key.offset = (u64)-1; | |
2240 | ||
2241 | fs_info = BTRFS_I(inode)->root->fs_info; | |
2242 | root = btrfs_read_fs_root_no_name(fs_info, &key); | |
2243 | if (IS_ERR(root)) { | |
2244 | if (PTR_ERR(root) == -ENOENT) | |
2245 | return 0; | |
2246 | WARN_ON(1); | |
2247 | pr_debug("inum=%llu, offset=%llu, root_id=%llu\n", | |
2248 | inum, offset, root_id); | |
2249 | return PTR_ERR(root); | |
2250 | } | |
2251 | ||
2252 | key.objectid = inum; | |
2253 | key.type = BTRFS_EXTENT_DATA_KEY; | |
2254 | if (offset > (u64)-1 << 32) | |
2255 | key.offset = 0; | |
2256 | else | |
2257 | key.offset = offset; | |
2258 | ||
2259 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); | |
fae7f21c | 2260 | if (WARN_ON(ret < 0)) |
38c227d8 | 2261 | return ret; |
50f1319c | 2262 | ret = 0; |
38c227d8 LB |
2263 | |
2264 | while (1) { | |
2265 | cond_resched(); | |
2266 | ||
2267 | leaf = path->nodes[0]; | |
2268 | slot = path->slots[0]; | |
2269 | ||
2270 | if (slot >= btrfs_header_nritems(leaf)) { | |
2271 | ret = btrfs_next_leaf(root, path); | |
2272 | if (ret < 0) { | |
2273 | goto out; | |
2274 | } else if (ret > 0) { | |
2275 | ret = 0; | |
2276 | goto out; | |
2277 | } | |
2278 | continue; | |
2279 | } | |
2280 | ||
2281 | path->slots[0]++; | |
2282 | ||
2283 | btrfs_item_key_to_cpu(leaf, &key, slot); | |
2284 | ||
2285 | if (key.objectid > inum) | |
2286 | goto out; | |
2287 | ||
2288 | if (key.objectid < inum || key.type != BTRFS_EXTENT_DATA_KEY) | |
2289 | continue; | |
2290 | ||
2291 | extent = btrfs_item_ptr(leaf, slot, | |
2292 | struct btrfs_file_extent_item); | |
2293 | ||
2294 | if (btrfs_file_extent_disk_bytenr(leaf, extent) != old->bytenr) | |
2295 | continue; | |
2296 | ||
e68afa49 LB |
2297 | /* |
2298 | * 'offset' refers to the exact key.offset, | |
2299 | * NOT the 'offset' field in btrfs_extent_data_ref, ie. | |
2300 | * (key.offset - extent_offset). | |
2301 | */ | |
2302 | if (key.offset != offset) | |
38c227d8 LB |
2303 | continue; |
2304 | ||
e68afa49 | 2305 | extent_offset = btrfs_file_extent_offset(leaf, extent); |
38c227d8 | 2306 | num_bytes = btrfs_file_extent_num_bytes(leaf, extent); |
e68afa49 | 2307 | |
38c227d8 LB |
2308 | if (extent_offset >= old->extent_offset + old->offset + |
2309 | old->len || extent_offset + num_bytes <= | |
2310 | old->extent_offset + old->offset) | |
2311 | continue; | |
38c227d8 LB |
2312 | break; |
2313 | } | |
2314 | ||
2315 | backref = kmalloc(sizeof(*backref), GFP_NOFS); | |
2316 | if (!backref) { | |
2317 | ret = -ENOENT; | |
2318 | goto out; | |
2319 | } | |
2320 | ||
2321 | backref->root_id = root_id; | |
2322 | backref->inum = inum; | |
e68afa49 | 2323 | backref->file_pos = offset; |
38c227d8 LB |
2324 | backref->num_bytes = num_bytes; |
2325 | backref->extent_offset = extent_offset; | |
2326 | backref->generation = btrfs_file_extent_generation(leaf, extent); | |
2327 | backref->old = old; | |
2328 | backref_insert(&new->root, backref); | |
2329 | old->count++; | |
2330 | out: | |
2331 | btrfs_release_path(path); | |
2332 | WARN_ON(ret); | |
2333 | return ret; | |
2334 | } | |
2335 | ||
2336 | static noinline bool record_extent_backrefs(struct btrfs_path *path, | |
2337 | struct new_sa_defrag_extent *new) | |
2338 | { | |
2339 | struct btrfs_fs_info *fs_info = BTRFS_I(new->inode)->root->fs_info; | |
2340 | struct old_sa_defrag_extent *old, *tmp; | |
2341 | int ret; | |
2342 | ||
2343 | new->path = path; | |
2344 | ||
2345 | list_for_each_entry_safe(old, tmp, &new->head, list) { | |
e68afa49 LB |
2346 | ret = iterate_inodes_from_logical(old->bytenr + |
2347 | old->extent_offset, fs_info, | |
38c227d8 LB |
2348 | path, record_one_backref, |
2349 | old); | |
4724b106 JB |
2350 | if (ret < 0 && ret != -ENOENT) |
2351 | return false; | |
38c227d8 LB |
2352 | |
2353 | /* no backref to be processed for this extent */ | |
2354 | if (!old->count) { | |
2355 | list_del(&old->list); | |
2356 | kfree(old); | |
2357 | } | |
2358 | } | |
2359 | ||
2360 | if (list_empty(&new->head)) | |
2361 | return false; | |
2362 | ||
2363 | return true; | |
2364 | } | |
2365 | ||
2366 | static int relink_is_mergable(struct extent_buffer *leaf, | |
2367 | struct btrfs_file_extent_item *fi, | |
116e0024 | 2368 | struct new_sa_defrag_extent *new) |
38c227d8 | 2369 | { |
116e0024 | 2370 | if (btrfs_file_extent_disk_bytenr(leaf, fi) != new->bytenr) |
38c227d8 LB |
2371 | return 0; |
2372 | ||
2373 | if (btrfs_file_extent_type(leaf, fi) != BTRFS_FILE_EXTENT_REG) | |
2374 | return 0; | |
2375 | ||
116e0024 LB |
2376 | if (btrfs_file_extent_compression(leaf, fi) != new->compress_type) |
2377 | return 0; | |
2378 | ||
2379 | if (btrfs_file_extent_encryption(leaf, fi) || | |
38c227d8 LB |
2380 | btrfs_file_extent_other_encoding(leaf, fi)) |
2381 | return 0; | |
2382 | ||
2383 | return 1; | |
2384 | } | |
2385 | ||
2386 | /* | |
2387 | * Note the backref might has changed, and in this case we just return 0. | |
2388 | */ | |
2389 | static noinline int relink_extent_backref(struct btrfs_path *path, | |
2390 | struct sa_defrag_extent_backref *prev, | |
2391 | struct sa_defrag_extent_backref *backref) | |
2392 | { | |
2393 | struct btrfs_file_extent_item *extent; | |
2394 | struct btrfs_file_extent_item *item; | |
2395 | struct btrfs_ordered_extent *ordered; | |
2396 | struct btrfs_trans_handle *trans; | |
2397 | struct btrfs_fs_info *fs_info; | |
2398 | struct btrfs_root *root; | |
2399 | struct btrfs_key key; | |
2400 | struct extent_buffer *leaf; | |
2401 | struct old_sa_defrag_extent *old = backref->old; | |
2402 | struct new_sa_defrag_extent *new = old->new; | |
2403 | struct inode *src_inode = new->inode; | |
2404 | struct inode *inode; | |
2405 | struct extent_state *cached = NULL; | |
2406 | int ret = 0; | |
2407 | u64 start; | |
2408 | u64 len; | |
2409 | u64 lock_start; | |
2410 | u64 lock_end; | |
2411 | bool merge = false; | |
2412 | int index; | |
2413 | ||
2414 | if (prev && prev->root_id == backref->root_id && | |
2415 | prev->inum == backref->inum && | |
2416 | prev->file_pos + prev->num_bytes == backref->file_pos) | |
2417 | merge = true; | |
2418 | ||
2419 | /* step 1: get root */ | |
2420 | key.objectid = backref->root_id; | |
2421 | key.type = BTRFS_ROOT_ITEM_KEY; | |
2422 | key.offset = (u64)-1; | |
2423 | ||
2424 | fs_info = BTRFS_I(src_inode)->root->fs_info; | |
2425 | index = srcu_read_lock(&fs_info->subvol_srcu); | |
2426 | ||
2427 | root = btrfs_read_fs_root_no_name(fs_info, &key); | |
2428 | if (IS_ERR(root)) { | |
2429 | srcu_read_unlock(&fs_info->subvol_srcu, index); | |
2430 | if (PTR_ERR(root) == -ENOENT) | |
2431 | return 0; | |
2432 | return PTR_ERR(root); | |
2433 | } | |
38c227d8 | 2434 | |
bcbba5e6 WS |
2435 | if (btrfs_root_readonly(root)) { |
2436 | srcu_read_unlock(&fs_info->subvol_srcu, index); | |
2437 | return 0; | |
2438 | } | |
2439 | ||
38c227d8 LB |
2440 | /* step 2: get inode */ |
2441 | key.objectid = backref->inum; | |
2442 | key.type = BTRFS_INODE_ITEM_KEY; | |
2443 | key.offset = 0; | |
2444 | ||
2445 | inode = btrfs_iget(fs_info->sb, &key, root, NULL); | |
2446 | if (IS_ERR(inode)) { | |
2447 | srcu_read_unlock(&fs_info->subvol_srcu, index); | |
2448 | return 0; | |
2449 | } | |
2450 | ||
2451 | srcu_read_unlock(&fs_info->subvol_srcu, index); | |
2452 | ||
2453 | /* step 3: relink backref */ | |
2454 | lock_start = backref->file_pos; | |
2455 | lock_end = backref->file_pos + backref->num_bytes - 1; | |
2456 | lock_extent_bits(&BTRFS_I(inode)->io_tree, lock_start, lock_end, | |
2457 | 0, &cached); | |
2458 | ||
2459 | ordered = btrfs_lookup_first_ordered_extent(inode, lock_end); | |
2460 | if (ordered) { | |
2461 | btrfs_put_ordered_extent(ordered); | |
2462 | goto out_unlock; | |
2463 | } | |
2464 | ||
2465 | trans = btrfs_join_transaction(root); | |
2466 | if (IS_ERR(trans)) { | |
2467 | ret = PTR_ERR(trans); | |
2468 | goto out_unlock; | |
2469 | } | |
2470 | ||
2471 | key.objectid = backref->inum; | |
2472 | key.type = BTRFS_EXTENT_DATA_KEY; | |
2473 | key.offset = backref->file_pos; | |
2474 | ||
2475 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); | |
2476 | if (ret < 0) { | |
2477 | goto out_free_path; | |
2478 | } else if (ret > 0) { | |
2479 | ret = 0; | |
2480 | goto out_free_path; | |
2481 | } | |
2482 | ||
2483 | extent = btrfs_item_ptr(path->nodes[0], path->slots[0], | |
2484 | struct btrfs_file_extent_item); | |
2485 | ||
2486 | if (btrfs_file_extent_generation(path->nodes[0], extent) != | |
2487 | backref->generation) | |
2488 | goto out_free_path; | |
2489 | ||
2490 | btrfs_release_path(path); | |
2491 | ||
2492 | start = backref->file_pos; | |
2493 | if (backref->extent_offset < old->extent_offset + old->offset) | |
2494 | start += old->extent_offset + old->offset - | |
2495 | backref->extent_offset; | |
2496 | ||
2497 | len = min(backref->extent_offset + backref->num_bytes, | |
2498 | old->extent_offset + old->offset + old->len); | |
2499 | len -= max(backref->extent_offset, old->extent_offset + old->offset); | |
2500 | ||
2501 | ret = btrfs_drop_extents(trans, root, inode, start, | |
2502 | start + len, 1); | |
2503 | if (ret) | |
2504 | goto out_free_path; | |
2505 | again: | |
2506 | key.objectid = btrfs_ino(inode); | |
2507 | key.type = BTRFS_EXTENT_DATA_KEY; | |
2508 | key.offset = start; | |
2509 | ||
a09a0a70 | 2510 | path->leave_spinning = 1; |
38c227d8 LB |
2511 | if (merge) { |
2512 | struct btrfs_file_extent_item *fi; | |
2513 | u64 extent_len; | |
2514 | struct btrfs_key found_key; | |
2515 | ||
3c9665df | 2516 | ret = btrfs_search_slot(trans, root, &key, path, 0, 1); |
38c227d8 LB |
2517 | if (ret < 0) |
2518 | goto out_free_path; | |
2519 | ||
2520 | path->slots[0]--; | |
2521 | leaf = path->nodes[0]; | |
2522 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); | |
2523 | ||
2524 | fi = btrfs_item_ptr(leaf, path->slots[0], | |
2525 | struct btrfs_file_extent_item); | |
2526 | extent_len = btrfs_file_extent_num_bytes(leaf, fi); | |
2527 | ||
116e0024 LB |
2528 | if (extent_len + found_key.offset == start && |
2529 | relink_is_mergable(leaf, fi, new)) { | |
38c227d8 LB |
2530 | btrfs_set_file_extent_num_bytes(leaf, fi, |
2531 | extent_len + len); | |
2532 | btrfs_mark_buffer_dirty(leaf); | |
2533 | inode_add_bytes(inode, len); | |
2534 | ||
2535 | ret = 1; | |
2536 | goto out_free_path; | |
2537 | } else { | |
2538 | merge = false; | |
2539 | btrfs_release_path(path); | |
2540 | goto again; | |
2541 | } | |
2542 | } | |
2543 | ||
2544 | ret = btrfs_insert_empty_item(trans, root, path, &key, | |
2545 | sizeof(*extent)); | |
2546 | if (ret) { | |
2547 | btrfs_abort_transaction(trans, root, ret); | |
2548 | goto out_free_path; | |
2549 | } | |
2550 | ||
2551 | leaf = path->nodes[0]; | |
2552 | item = btrfs_item_ptr(leaf, path->slots[0], | |
2553 | struct btrfs_file_extent_item); | |
2554 | btrfs_set_file_extent_disk_bytenr(leaf, item, new->bytenr); | |
2555 | btrfs_set_file_extent_disk_num_bytes(leaf, item, new->disk_len); | |
2556 | btrfs_set_file_extent_offset(leaf, item, start - new->file_pos); | |
2557 | btrfs_set_file_extent_num_bytes(leaf, item, len); | |
2558 | btrfs_set_file_extent_ram_bytes(leaf, item, new->len); | |
2559 | btrfs_set_file_extent_generation(leaf, item, trans->transid); | |
2560 | btrfs_set_file_extent_type(leaf, item, BTRFS_FILE_EXTENT_REG); | |
2561 | btrfs_set_file_extent_compression(leaf, item, new->compress_type); | |
2562 | btrfs_set_file_extent_encryption(leaf, item, 0); | |
2563 | btrfs_set_file_extent_other_encoding(leaf, item, 0); | |
2564 | ||
2565 | btrfs_mark_buffer_dirty(leaf); | |
2566 | inode_add_bytes(inode, len); | |
a09a0a70 | 2567 | btrfs_release_path(path); |
38c227d8 LB |
2568 | |
2569 | ret = btrfs_inc_extent_ref(trans, root, new->bytenr, | |
2570 | new->disk_len, 0, | |
2571 | backref->root_id, backref->inum, | |
2572 | new->file_pos, 0); /* start - extent_offset */ | |
2573 | if (ret) { | |
2574 | btrfs_abort_transaction(trans, root, ret); | |
2575 | goto out_free_path; | |
2576 | } | |
2577 | ||
2578 | ret = 1; | |
2579 | out_free_path: | |
2580 | btrfs_release_path(path); | |
a09a0a70 | 2581 | path->leave_spinning = 0; |
38c227d8 LB |
2582 | btrfs_end_transaction(trans, root); |
2583 | out_unlock: | |
2584 | unlock_extent_cached(&BTRFS_I(inode)->io_tree, lock_start, lock_end, | |
2585 | &cached, GFP_NOFS); | |
2586 | iput(inode); | |
2587 | return ret; | |
2588 | } | |
2589 | ||
6f519564 LB |
2590 | static void free_sa_defrag_extent(struct new_sa_defrag_extent *new) |
2591 | { | |
2592 | struct old_sa_defrag_extent *old, *tmp; | |
2593 | ||
2594 | if (!new) | |
2595 | return; | |
2596 | ||
2597 | list_for_each_entry_safe(old, tmp, &new->head, list) { | |
2598 | list_del(&old->list); | |
2599 | kfree(old); | |
2600 | } | |
2601 | kfree(new); | |
2602 | } | |
2603 | ||
38c227d8 LB |
2604 | static void relink_file_extents(struct new_sa_defrag_extent *new) |
2605 | { | |
2606 | struct btrfs_path *path; | |
38c227d8 LB |
2607 | struct sa_defrag_extent_backref *backref; |
2608 | struct sa_defrag_extent_backref *prev = NULL; | |
2609 | struct inode *inode; | |
2610 | struct btrfs_root *root; | |
2611 | struct rb_node *node; | |
2612 | int ret; | |
2613 | ||
2614 | inode = new->inode; | |
2615 | root = BTRFS_I(inode)->root; | |
2616 | ||
2617 | path = btrfs_alloc_path(); | |
2618 | if (!path) | |
2619 | return; | |
2620 | ||
2621 | if (!record_extent_backrefs(path, new)) { | |
2622 | btrfs_free_path(path); | |
2623 | goto out; | |
2624 | } | |
2625 | btrfs_release_path(path); | |
2626 | ||
2627 | while (1) { | |
2628 | node = rb_first(&new->root); | |
2629 | if (!node) | |
2630 | break; | |
2631 | rb_erase(node, &new->root); | |
2632 | ||
2633 | backref = rb_entry(node, struct sa_defrag_extent_backref, node); | |
2634 | ||
2635 | ret = relink_extent_backref(path, prev, backref); | |
2636 | WARN_ON(ret < 0); | |
2637 | ||
2638 | kfree(prev); | |
2639 | ||
2640 | if (ret == 1) | |
2641 | prev = backref; | |
2642 | else | |
2643 | prev = NULL; | |
2644 | cond_resched(); | |
2645 | } | |
2646 | kfree(prev); | |
2647 | ||
2648 | btrfs_free_path(path); | |
38c227d8 | 2649 | out: |
6f519564 LB |
2650 | free_sa_defrag_extent(new); |
2651 | ||
38c227d8 LB |
2652 | atomic_dec(&root->fs_info->defrag_running); |
2653 | wake_up(&root->fs_info->transaction_wait); | |
38c227d8 LB |
2654 | } |
2655 | ||
2656 | static struct new_sa_defrag_extent * | |
2657 | record_old_file_extents(struct inode *inode, | |
2658 | struct btrfs_ordered_extent *ordered) | |
2659 | { | |
2660 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
2661 | struct btrfs_path *path; | |
2662 | struct btrfs_key key; | |
6f519564 | 2663 | struct old_sa_defrag_extent *old; |
38c227d8 LB |
2664 | struct new_sa_defrag_extent *new; |
2665 | int ret; | |
2666 | ||
2667 | new = kmalloc(sizeof(*new), GFP_NOFS); | |
2668 | if (!new) | |
2669 | return NULL; | |
2670 | ||
2671 | new->inode = inode; | |
2672 | new->file_pos = ordered->file_offset; | |
2673 | new->len = ordered->len; | |
2674 | new->bytenr = ordered->start; | |
2675 | new->disk_len = ordered->disk_len; | |
2676 | new->compress_type = ordered->compress_type; | |
2677 | new->root = RB_ROOT; | |
2678 | INIT_LIST_HEAD(&new->head); | |
2679 | ||
2680 | path = btrfs_alloc_path(); | |
2681 | if (!path) | |
2682 | goto out_kfree; | |
2683 | ||
2684 | key.objectid = btrfs_ino(inode); | |
2685 | key.type = BTRFS_EXTENT_DATA_KEY; | |
2686 | key.offset = new->file_pos; | |
2687 | ||
2688 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); | |
2689 | if (ret < 0) | |
2690 | goto out_free_path; | |
2691 | if (ret > 0 && path->slots[0] > 0) | |
2692 | path->slots[0]--; | |
2693 | ||
2694 | /* find out all the old extents for the file range */ | |
2695 | while (1) { | |
2696 | struct btrfs_file_extent_item *extent; | |
2697 | struct extent_buffer *l; | |
2698 | int slot; | |
2699 | u64 num_bytes; | |
2700 | u64 offset; | |
2701 | u64 end; | |
2702 | u64 disk_bytenr; | |
2703 | u64 extent_offset; | |
2704 | ||
2705 | l = path->nodes[0]; | |
2706 | slot = path->slots[0]; | |
2707 | ||
2708 | if (slot >= btrfs_header_nritems(l)) { | |
2709 | ret = btrfs_next_leaf(root, path); | |
2710 | if (ret < 0) | |
6f519564 | 2711 | goto out_free_path; |
38c227d8 LB |
2712 | else if (ret > 0) |
2713 | break; | |
2714 | continue; | |
2715 | } | |
2716 | ||
2717 | btrfs_item_key_to_cpu(l, &key, slot); | |
2718 | ||
2719 | if (key.objectid != btrfs_ino(inode)) | |
2720 | break; | |
2721 | if (key.type != BTRFS_EXTENT_DATA_KEY) | |
2722 | break; | |
2723 | if (key.offset >= new->file_pos + new->len) | |
2724 | break; | |
2725 | ||
2726 | extent = btrfs_item_ptr(l, slot, struct btrfs_file_extent_item); | |
2727 | ||
2728 | num_bytes = btrfs_file_extent_num_bytes(l, extent); | |
2729 | if (key.offset + num_bytes < new->file_pos) | |
2730 | goto next; | |
2731 | ||
2732 | disk_bytenr = btrfs_file_extent_disk_bytenr(l, extent); | |
2733 | if (!disk_bytenr) | |
2734 | goto next; | |
2735 | ||
2736 | extent_offset = btrfs_file_extent_offset(l, extent); | |
2737 | ||
2738 | old = kmalloc(sizeof(*old), GFP_NOFS); | |
2739 | if (!old) | |
6f519564 | 2740 | goto out_free_path; |
38c227d8 LB |
2741 | |
2742 | offset = max(new->file_pos, key.offset); | |
2743 | end = min(new->file_pos + new->len, key.offset + num_bytes); | |
2744 | ||
2745 | old->bytenr = disk_bytenr; | |
2746 | old->extent_offset = extent_offset; | |
2747 | old->offset = offset - key.offset; | |
2748 | old->len = end - offset; | |
2749 | old->new = new; | |
2750 | old->count = 0; | |
2751 | list_add_tail(&old->list, &new->head); | |
2752 | next: | |
2753 | path->slots[0]++; | |
2754 | cond_resched(); | |
2755 | } | |
2756 | ||
2757 | btrfs_free_path(path); | |
2758 | atomic_inc(&root->fs_info->defrag_running); | |
2759 | ||
2760 | return new; | |
2761 | ||
38c227d8 LB |
2762 | out_free_path: |
2763 | btrfs_free_path(path); | |
2764 | out_kfree: | |
6f519564 | 2765 | free_sa_defrag_extent(new); |
38c227d8 LB |
2766 | return NULL; |
2767 | } | |
2768 | ||
e570fd27 MX |
2769 | static void btrfs_release_delalloc_bytes(struct btrfs_root *root, |
2770 | u64 start, u64 len) | |
2771 | { | |
2772 | struct btrfs_block_group_cache *cache; | |
2773 | ||
2774 | cache = btrfs_lookup_block_group(root->fs_info, start); | |
2775 | ASSERT(cache); | |
2776 | ||
2777 | spin_lock(&cache->lock); | |
2778 | cache->delalloc_bytes -= len; | |
2779 | spin_unlock(&cache->lock); | |
2780 | ||
2781 | btrfs_put_block_group(cache); | |
2782 | } | |
2783 | ||
d352ac68 CM |
2784 | /* as ordered data IO finishes, this gets called so we can finish |
2785 | * an ordered extent if the range of bytes in the file it covers are | |
2786 | * fully written. | |
2787 | */ | |
5fd02043 | 2788 | static int btrfs_finish_ordered_io(struct btrfs_ordered_extent *ordered_extent) |
e6dcd2dc | 2789 | { |
5fd02043 | 2790 | struct inode *inode = ordered_extent->inode; |
e6dcd2dc | 2791 | struct btrfs_root *root = BTRFS_I(inode)->root; |
0ca1f7ce | 2792 | struct btrfs_trans_handle *trans = NULL; |
e6dcd2dc | 2793 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; |
2ac55d41 | 2794 | struct extent_state *cached_state = NULL; |
38c227d8 | 2795 | struct new_sa_defrag_extent *new = NULL; |
261507a0 | 2796 | int compress_type = 0; |
77cef2ec JB |
2797 | int ret = 0; |
2798 | u64 logical_len = ordered_extent->len; | |
82d5902d | 2799 | bool nolock; |
77cef2ec | 2800 | bool truncated = false; |
e6dcd2dc | 2801 | |
83eea1f1 | 2802 | nolock = btrfs_is_free_space_inode(inode); |
0cb59c99 | 2803 | |
5fd02043 JB |
2804 | if (test_bit(BTRFS_ORDERED_IOERR, &ordered_extent->flags)) { |
2805 | ret = -EIO; | |
2806 | goto out; | |
2807 | } | |
2808 | ||
f612496b MX |
2809 | btrfs_free_io_failure_record(inode, ordered_extent->file_offset, |
2810 | ordered_extent->file_offset + | |
2811 | ordered_extent->len - 1); | |
2812 | ||
77cef2ec JB |
2813 | if (test_bit(BTRFS_ORDERED_TRUNCATED, &ordered_extent->flags)) { |
2814 | truncated = true; | |
2815 | logical_len = ordered_extent->truncated_len; | |
2816 | /* Truncated the entire extent, don't bother adding */ | |
2817 | if (!logical_len) | |
2818 | goto out; | |
2819 | } | |
2820 | ||
c2167754 | 2821 | if (test_bit(BTRFS_ORDERED_NOCOW, &ordered_extent->flags)) { |
79787eaa | 2822 | BUG_ON(!list_empty(&ordered_extent->list)); /* Logic error */ |
6c760c07 JB |
2823 | btrfs_ordered_update_i_size(inode, 0, ordered_extent); |
2824 | if (nolock) | |
2825 | trans = btrfs_join_transaction_nolock(root); | |
2826 | else | |
2827 | trans = btrfs_join_transaction(root); | |
2828 | if (IS_ERR(trans)) { | |
2829 | ret = PTR_ERR(trans); | |
2830 | trans = NULL; | |
2831 | goto out; | |
c2167754 | 2832 | } |
6c760c07 JB |
2833 | trans->block_rsv = &root->fs_info->delalloc_block_rsv; |
2834 | ret = btrfs_update_inode_fallback(trans, root, inode); | |
2835 | if (ret) /* -ENOMEM or corruption */ | |
2836 | btrfs_abort_transaction(trans, root, ret); | |
c2167754 YZ |
2837 | goto out; |
2838 | } | |
e6dcd2dc | 2839 | |
2ac55d41 JB |
2840 | lock_extent_bits(io_tree, ordered_extent->file_offset, |
2841 | ordered_extent->file_offset + ordered_extent->len - 1, | |
d0082371 | 2842 | 0, &cached_state); |
e6dcd2dc | 2843 | |
38c227d8 LB |
2844 | ret = test_range_bit(io_tree, ordered_extent->file_offset, |
2845 | ordered_extent->file_offset + ordered_extent->len - 1, | |
2846 | EXTENT_DEFRAG, 1, cached_state); | |
2847 | if (ret) { | |
2848 | u64 last_snapshot = btrfs_root_last_snapshot(&root->root_item); | |
8101c8db | 2849 | if (0 && last_snapshot >= BTRFS_I(inode)->generation) |
38c227d8 LB |
2850 | /* the inode is shared */ |
2851 | new = record_old_file_extents(inode, ordered_extent); | |
2852 | ||
2853 | clear_extent_bit(io_tree, ordered_extent->file_offset, | |
2854 | ordered_extent->file_offset + ordered_extent->len - 1, | |
2855 | EXTENT_DEFRAG, 0, 0, &cached_state, GFP_NOFS); | |
2856 | } | |
2857 | ||
0cb59c99 | 2858 | if (nolock) |
7a7eaa40 | 2859 | trans = btrfs_join_transaction_nolock(root); |
0cb59c99 | 2860 | else |
7a7eaa40 | 2861 | trans = btrfs_join_transaction(root); |
79787eaa JM |
2862 | if (IS_ERR(trans)) { |
2863 | ret = PTR_ERR(trans); | |
2864 | trans = NULL; | |
2865 | goto out_unlock; | |
2866 | } | |
a79b7d4b | 2867 | |
0ca1f7ce | 2868 | trans->block_rsv = &root->fs_info->delalloc_block_rsv; |
c2167754 | 2869 | |
c8b97818 | 2870 | if (test_bit(BTRFS_ORDERED_COMPRESSED, &ordered_extent->flags)) |
261507a0 | 2871 | compress_type = ordered_extent->compress_type; |
d899e052 | 2872 | if (test_bit(BTRFS_ORDERED_PREALLOC, &ordered_extent->flags)) { |
261507a0 | 2873 | BUG_ON(compress_type); |
920bbbfb | 2874 | ret = btrfs_mark_extent_written(trans, inode, |
d899e052 YZ |
2875 | ordered_extent->file_offset, |
2876 | ordered_extent->file_offset + | |
77cef2ec | 2877 | logical_len); |
d899e052 | 2878 | } else { |
0af3d00b | 2879 | BUG_ON(root == root->fs_info->tree_root); |
d899e052 YZ |
2880 | ret = insert_reserved_file_extent(trans, inode, |
2881 | ordered_extent->file_offset, | |
2882 | ordered_extent->start, | |
2883 | ordered_extent->disk_len, | |
77cef2ec | 2884 | logical_len, logical_len, |
261507a0 | 2885 | compress_type, 0, 0, |
d899e052 | 2886 | BTRFS_FILE_EXTENT_REG); |
e570fd27 MX |
2887 | if (!ret) |
2888 | btrfs_release_delalloc_bytes(root, | |
2889 | ordered_extent->start, | |
2890 | ordered_extent->disk_len); | |
d899e052 | 2891 | } |
5dc562c5 JB |
2892 | unpin_extent_cache(&BTRFS_I(inode)->extent_tree, |
2893 | ordered_extent->file_offset, ordered_extent->len, | |
2894 | trans->transid); | |
79787eaa JM |
2895 | if (ret < 0) { |
2896 | btrfs_abort_transaction(trans, root, ret); | |
5fd02043 | 2897 | goto out_unlock; |
79787eaa | 2898 | } |
2ac55d41 | 2899 | |
e6dcd2dc CM |
2900 | add_pending_csums(trans, inode, ordered_extent->file_offset, |
2901 | &ordered_extent->list); | |
2902 | ||
6c760c07 JB |
2903 | btrfs_ordered_update_i_size(inode, 0, ordered_extent); |
2904 | ret = btrfs_update_inode_fallback(trans, root, inode); | |
2905 | if (ret) { /* -ENOMEM or corruption */ | |
2906 | btrfs_abort_transaction(trans, root, ret); | |
2907 | goto out_unlock; | |
1ef30be1 JB |
2908 | } |
2909 | ret = 0; | |
5fd02043 JB |
2910 | out_unlock: |
2911 | unlock_extent_cached(io_tree, ordered_extent->file_offset, | |
2912 | ordered_extent->file_offset + | |
2913 | ordered_extent->len - 1, &cached_state, GFP_NOFS); | |
c2167754 | 2914 | out: |
5b0e95bf | 2915 | if (root != root->fs_info->tree_root) |
0cb59c99 | 2916 | btrfs_delalloc_release_metadata(inode, ordered_extent->len); |
a698d075 MX |
2917 | if (trans) |
2918 | btrfs_end_transaction(trans, root); | |
0cb59c99 | 2919 | |
77cef2ec JB |
2920 | if (ret || truncated) { |
2921 | u64 start, end; | |
2922 | ||
2923 | if (truncated) | |
2924 | start = ordered_extent->file_offset + logical_len; | |
2925 | else | |
2926 | start = ordered_extent->file_offset; | |
2927 | end = ordered_extent->file_offset + ordered_extent->len - 1; | |
2928 | clear_extent_uptodate(io_tree, start, end, NULL, GFP_NOFS); | |
2929 | ||
2930 | /* Drop the cache for the part of the extent we didn't write. */ | |
2931 | btrfs_drop_extent_cache(inode, start, end, 0); | |
5fd02043 | 2932 | |
0bec9ef5 JB |
2933 | /* |
2934 | * If the ordered extent had an IOERR or something else went | |
2935 | * wrong we need to return the space for this ordered extent | |
77cef2ec JB |
2936 | * back to the allocator. We only free the extent in the |
2937 | * truncated case if we didn't write out the extent at all. | |
0bec9ef5 | 2938 | */ |
77cef2ec JB |
2939 | if ((ret || !logical_len) && |
2940 | !test_bit(BTRFS_ORDERED_NOCOW, &ordered_extent->flags) && | |
0bec9ef5 JB |
2941 | !test_bit(BTRFS_ORDERED_PREALLOC, &ordered_extent->flags)) |
2942 | btrfs_free_reserved_extent(root, ordered_extent->start, | |
e570fd27 | 2943 | ordered_extent->disk_len, 1); |
0bec9ef5 JB |
2944 | } |
2945 | ||
2946 | ||
5fd02043 | 2947 | /* |
8bad3c02 LB |
2948 | * This needs to be done to make sure anybody waiting knows we are done |
2949 | * updating everything for this ordered extent. | |
5fd02043 JB |
2950 | */ |
2951 | btrfs_remove_ordered_extent(inode, ordered_extent); | |
2952 | ||
38c227d8 | 2953 | /* for snapshot-aware defrag */ |
6f519564 LB |
2954 | if (new) { |
2955 | if (ret) { | |
2956 | free_sa_defrag_extent(new); | |
2957 | atomic_dec(&root->fs_info->defrag_running); | |
2958 | } else { | |
2959 | relink_file_extents(new); | |
2960 | } | |
2961 | } | |
38c227d8 | 2962 | |
e6dcd2dc CM |
2963 | /* once for us */ |
2964 | btrfs_put_ordered_extent(ordered_extent); | |
2965 | /* once for the tree */ | |
2966 | btrfs_put_ordered_extent(ordered_extent); | |
2967 | ||
5fd02043 JB |
2968 | return ret; |
2969 | } | |
2970 | ||
2971 | static void finish_ordered_fn(struct btrfs_work *work) | |
2972 | { | |
2973 | struct btrfs_ordered_extent *ordered_extent; | |
2974 | ordered_extent = container_of(work, struct btrfs_ordered_extent, work); | |
2975 | btrfs_finish_ordered_io(ordered_extent); | |
e6dcd2dc CM |
2976 | } |
2977 | ||
b2950863 | 2978 | static int btrfs_writepage_end_io_hook(struct page *page, u64 start, u64 end, |
211f90e6 CM |
2979 | struct extent_state *state, int uptodate) |
2980 | { | |
5fd02043 JB |
2981 | struct inode *inode = page->mapping->host; |
2982 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
2983 | struct btrfs_ordered_extent *ordered_extent = NULL; | |
9e0af237 LB |
2984 | struct btrfs_workqueue *wq; |
2985 | btrfs_work_func_t func; | |
5fd02043 | 2986 | |
1abe9b8a | 2987 | trace_btrfs_writepage_end_io_hook(page, start, end, uptodate); |
2988 | ||
8b62b72b | 2989 | ClearPagePrivate2(page); |
5fd02043 JB |
2990 | if (!btrfs_dec_test_ordered_pending(inode, &ordered_extent, start, |
2991 | end - start + 1, uptodate)) | |
2992 | return 0; | |
2993 | ||
9e0af237 LB |
2994 | if (btrfs_is_free_space_inode(inode)) { |
2995 | wq = root->fs_info->endio_freespace_worker; | |
2996 | func = btrfs_freespace_write_helper; | |
2997 | } else { | |
2998 | wq = root->fs_info->endio_write_workers; | |
2999 | func = btrfs_endio_write_helper; | |
3000 | } | |
5fd02043 | 3001 | |
9e0af237 LB |
3002 | btrfs_init_work(&ordered_extent->work, func, finish_ordered_fn, NULL, |
3003 | NULL); | |
3004 | btrfs_queue_work(wq, &ordered_extent->work); | |
5fd02043 JB |
3005 | |
3006 | return 0; | |
211f90e6 CM |
3007 | } |
3008 | ||
dc380aea MX |
3009 | static int __readpage_endio_check(struct inode *inode, |
3010 | struct btrfs_io_bio *io_bio, | |
3011 | int icsum, struct page *page, | |
3012 | int pgoff, u64 start, size_t len) | |
3013 | { | |
3014 | char *kaddr; | |
3015 | u32 csum_expected; | |
3016 | u32 csum = ~(u32)0; | |
3017 | static DEFINE_RATELIMIT_STATE(_rs, DEFAULT_RATELIMIT_INTERVAL, | |
3018 | DEFAULT_RATELIMIT_BURST); | |
3019 | ||
3020 | csum_expected = *(((u32 *)io_bio->csum) + icsum); | |
3021 | ||
3022 | kaddr = kmap_atomic(page); | |
3023 | csum = btrfs_csum_data(kaddr + pgoff, csum, len); | |
3024 | btrfs_csum_final(csum, (char *)&csum); | |
3025 | if (csum != csum_expected) | |
3026 | goto zeroit; | |
3027 | ||
3028 | kunmap_atomic(kaddr); | |
3029 | return 0; | |
3030 | zeroit: | |
3031 | if (__ratelimit(&_rs)) | |
f0954c66 | 3032 | btrfs_warn(BTRFS_I(inode)->root->fs_info, |
dc380aea MX |
3033 | "csum failed ino %llu off %llu csum %u expected csum %u", |
3034 | btrfs_ino(inode), start, csum, csum_expected); | |
3035 | memset(kaddr + pgoff, 1, len); | |
3036 | flush_dcache_page(page); | |
3037 | kunmap_atomic(kaddr); | |
3038 | if (csum_expected == 0) | |
3039 | return 0; | |
3040 | return -EIO; | |
3041 | } | |
3042 | ||
d352ac68 CM |
3043 | /* |
3044 | * when reads are done, we need to check csums to verify the data is correct | |
4a54c8c1 JS |
3045 | * if there's a match, we allow the bio to finish. If not, the code in |
3046 | * extent_io.c will try to find good copies for us. | |
d352ac68 | 3047 | */ |
facc8a22 MX |
3048 | static int btrfs_readpage_end_io_hook(struct btrfs_io_bio *io_bio, |
3049 | u64 phy_offset, struct page *page, | |
3050 | u64 start, u64 end, int mirror) | |
07157aac | 3051 | { |
4eee4fa4 | 3052 | size_t offset = start - page_offset(page); |
07157aac | 3053 | struct inode *inode = page->mapping->host; |
d1310b2e | 3054 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; |
ff79f819 | 3055 | struct btrfs_root *root = BTRFS_I(inode)->root; |
d1310b2e | 3056 | |
d20f7043 CM |
3057 | if (PageChecked(page)) { |
3058 | ClearPageChecked(page); | |
dc380aea | 3059 | return 0; |
d20f7043 | 3060 | } |
6cbff00f CH |
3061 | |
3062 | if (BTRFS_I(inode)->flags & BTRFS_INODE_NODATASUM) | |
dc380aea | 3063 | return 0; |
17d217fe YZ |
3064 | |
3065 | if (root->root_key.objectid == BTRFS_DATA_RELOC_TREE_OBJECTID && | |
9655d298 | 3066 | test_range_bit(io_tree, start, end, EXTENT_NODATASUM, 1, NULL)) { |
17d217fe YZ |
3067 | clear_extent_bits(io_tree, start, end, EXTENT_NODATASUM, |
3068 | GFP_NOFS); | |
b6cda9bc | 3069 | return 0; |
17d217fe | 3070 | } |
d20f7043 | 3071 | |
facc8a22 | 3072 | phy_offset >>= inode->i_sb->s_blocksize_bits; |
dc380aea MX |
3073 | return __readpage_endio_check(inode, io_bio, phy_offset, page, offset, |
3074 | start, (size_t)(end - start + 1)); | |
07157aac | 3075 | } |
b888db2b | 3076 | |
24bbcf04 YZ |
3077 | struct delayed_iput { |
3078 | struct list_head list; | |
3079 | struct inode *inode; | |
3080 | }; | |
3081 | ||
79787eaa JM |
3082 | /* JDM: If this is fs-wide, why can't we add a pointer to |
3083 | * btrfs_inode instead and avoid the allocation? */ | |
24bbcf04 YZ |
3084 | void btrfs_add_delayed_iput(struct inode *inode) |
3085 | { | |
3086 | struct btrfs_fs_info *fs_info = BTRFS_I(inode)->root->fs_info; | |
3087 | struct delayed_iput *delayed; | |
3088 | ||
3089 | if (atomic_add_unless(&inode->i_count, -1, 1)) | |
3090 | return; | |
3091 | ||
3092 | delayed = kmalloc(sizeof(*delayed), GFP_NOFS | __GFP_NOFAIL); | |
3093 | delayed->inode = inode; | |
3094 | ||
3095 | spin_lock(&fs_info->delayed_iput_lock); | |
3096 | list_add_tail(&delayed->list, &fs_info->delayed_iputs); | |
3097 | spin_unlock(&fs_info->delayed_iput_lock); | |
3098 | } | |
3099 | ||
3100 | void btrfs_run_delayed_iputs(struct btrfs_root *root) | |
3101 | { | |
3102 | LIST_HEAD(list); | |
3103 | struct btrfs_fs_info *fs_info = root->fs_info; | |
3104 | struct delayed_iput *delayed; | |
3105 | int empty; | |
3106 | ||
3107 | spin_lock(&fs_info->delayed_iput_lock); | |
3108 | empty = list_empty(&fs_info->delayed_iputs); | |
3109 | spin_unlock(&fs_info->delayed_iput_lock); | |
3110 | if (empty) | |
3111 | return; | |
3112 | ||
d7c15171 ZL |
3113 | down_read(&fs_info->delayed_iput_sem); |
3114 | ||
24bbcf04 YZ |
3115 | spin_lock(&fs_info->delayed_iput_lock); |
3116 | list_splice_init(&fs_info->delayed_iputs, &list); | |
3117 | spin_unlock(&fs_info->delayed_iput_lock); | |
3118 | ||
3119 | while (!list_empty(&list)) { | |
3120 | delayed = list_entry(list.next, struct delayed_iput, list); | |
3121 | list_del(&delayed->list); | |
3122 | iput(delayed->inode); | |
3123 | kfree(delayed); | |
3124 | } | |
d7c15171 ZL |
3125 | |
3126 | up_read(&root->fs_info->delayed_iput_sem); | |
24bbcf04 YZ |
3127 | } |
3128 | ||
d68fc57b | 3129 | /* |
42b2aa86 | 3130 | * This is called in transaction commit time. If there are no orphan |
d68fc57b YZ |
3131 | * files in the subvolume, it removes orphan item and frees block_rsv |
3132 | * structure. | |
3133 | */ | |
3134 | void btrfs_orphan_commit_root(struct btrfs_trans_handle *trans, | |
3135 | struct btrfs_root *root) | |
3136 | { | |
90290e19 | 3137 | struct btrfs_block_rsv *block_rsv; |
d68fc57b YZ |
3138 | int ret; |
3139 | ||
8a35d95f | 3140 | if (atomic_read(&root->orphan_inodes) || |
d68fc57b YZ |
3141 | root->orphan_cleanup_state != ORPHAN_CLEANUP_DONE) |
3142 | return; | |
3143 | ||
90290e19 | 3144 | spin_lock(&root->orphan_lock); |
8a35d95f | 3145 | if (atomic_read(&root->orphan_inodes)) { |
90290e19 JB |
3146 | spin_unlock(&root->orphan_lock); |
3147 | return; | |
3148 | } | |
3149 | ||
3150 | if (root->orphan_cleanup_state != ORPHAN_CLEANUP_DONE) { | |
3151 | spin_unlock(&root->orphan_lock); | |
3152 | return; | |
3153 | } | |
3154 | ||
3155 | block_rsv = root->orphan_block_rsv; | |
3156 | root->orphan_block_rsv = NULL; | |
3157 | spin_unlock(&root->orphan_lock); | |
3158 | ||
27cdeb70 | 3159 | if (test_bit(BTRFS_ROOT_ORPHAN_ITEM_INSERTED, &root->state) && |
d68fc57b YZ |
3160 | btrfs_root_refs(&root->root_item) > 0) { |
3161 | ret = btrfs_del_orphan_item(trans, root->fs_info->tree_root, | |
3162 | root->root_key.objectid); | |
4ef31a45 JB |
3163 | if (ret) |
3164 | btrfs_abort_transaction(trans, root, ret); | |
3165 | else | |
27cdeb70 MX |
3166 | clear_bit(BTRFS_ROOT_ORPHAN_ITEM_INSERTED, |
3167 | &root->state); | |
d68fc57b YZ |
3168 | } |
3169 | ||
90290e19 JB |
3170 | if (block_rsv) { |
3171 | WARN_ON(block_rsv->size > 0); | |
3172 | btrfs_free_block_rsv(root, block_rsv); | |
d68fc57b YZ |
3173 | } |
3174 | } | |
3175 | ||
7b128766 JB |
3176 | /* |
3177 | * This creates an orphan entry for the given inode in case something goes | |
3178 | * wrong in the middle of an unlink/truncate. | |
d68fc57b YZ |
3179 | * |
3180 | * NOTE: caller of this function should reserve 5 units of metadata for | |
3181 | * this function. | |
7b128766 JB |
3182 | */ |
3183 | int btrfs_orphan_add(struct btrfs_trans_handle *trans, struct inode *inode) | |
3184 | { | |
3185 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
d68fc57b YZ |
3186 | struct btrfs_block_rsv *block_rsv = NULL; |
3187 | int reserve = 0; | |
3188 | int insert = 0; | |
3189 | int ret; | |
7b128766 | 3190 | |
d68fc57b | 3191 | if (!root->orphan_block_rsv) { |
66d8f3dd | 3192 | block_rsv = btrfs_alloc_block_rsv(root, BTRFS_BLOCK_RSV_TEMP); |
b532402e TI |
3193 | if (!block_rsv) |
3194 | return -ENOMEM; | |
d68fc57b | 3195 | } |
7b128766 | 3196 | |
d68fc57b YZ |
3197 | spin_lock(&root->orphan_lock); |
3198 | if (!root->orphan_block_rsv) { | |
3199 | root->orphan_block_rsv = block_rsv; | |
3200 | } else if (block_rsv) { | |
3201 | btrfs_free_block_rsv(root, block_rsv); | |
3202 | block_rsv = NULL; | |
7b128766 | 3203 | } |
7b128766 | 3204 | |
8a35d95f JB |
3205 | if (!test_and_set_bit(BTRFS_INODE_HAS_ORPHAN_ITEM, |
3206 | &BTRFS_I(inode)->runtime_flags)) { | |
d68fc57b YZ |
3207 | #if 0 |
3208 | /* | |
3209 | * For proper ENOSPC handling, we should do orphan | |
3210 | * cleanup when mounting. But this introduces backward | |
3211 | * compatibility issue. | |
3212 | */ | |
3213 | if (!xchg(&root->orphan_item_inserted, 1)) | |
3214 | insert = 2; | |
3215 | else | |
3216 | insert = 1; | |
3217 | #endif | |
3218 | insert = 1; | |
321f0e70 | 3219 | atomic_inc(&root->orphan_inodes); |
7b128766 JB |
3220 | } |
3221 | ||
72ac3c0d JB |
3222 | if (!test_and_set_bit(BTRFS_INODE_ORPHAN_META_RESERVED, |
3223 | &BTRFS_I(inode)->runtime_flags)) | |
d68fc57b | 3224 | reserve = 1; |
d68fc57b | 3225 | spin_unlock(&root->orphan_lock); |
7b128766 | 3226 | |
d68fc57b YZ |
3227 | /* grab metadata reservation from transaction handle */ |
3228 | if (reserve) { | |
3229 | ret = btrfs_orphan_reserve_metadata(trans, inode); | |
79787eaa | 3230 | BUG_ON(ret); /* -ENOSPC in reservation; Logic error? JDM */ |
d68fc57b | 3231 | } |
7b128766 | 3232 | |
d68fc57b YZ |
3233 | /* insert an orphan item to track this unlinked/truncated file */ |
3234 | if (insert >= 1) { | |
33345d01 | 3235 | ret = btrfs_insert_orphan_item(trans, root, btrfs_ino(inode)); |
4ef31a45 | 3236 | if (ret) { |
703c88e0 | 3237 | atomic_dec(&root->orphan_inodes); |
4ef31a45 JB |
3238 | if (reserve) { |
3239 | clear_bit(BTRFS_INODE_ORPHAN_META_RESERVED, | |
3240 | &BTRFS_I(inode)->runtime_flags); | |
3241 | btrfs_orphan_release_metadata(inode); | |
3242 | } | |
3243 | if (ret != -EEXIST) { | |
e8e7cff6 JB |
3244 | clear_bit(BTRFS_INODE_HAS_ORPHAN_ITEM, |
3245 | &BTRFS_I(inode)->runtime_flags); | |
4ef31a45 JB |
3246 | btrfs_abort_transaction(trans, root, ret); |
3247 | return ret; | |
3248 | } | |
79787eaa JM |
3249 | } |
3250 | ret = 0; | |
d68fc57b YZ |
3251 | } |
3252 | ||
3253 | /* insert an orphan item to track subvolume contains orphan files */ | |
3254 | if (insert >= 2) { | |
3255 | ret = btrfs_insert_orphan_item(trans, root->fs_info->tree_root, | |
3256 | root->root_key.objectid); | |
79787eaa JM |
3257 | if (ret && ret != -EEXIST) { |
3258 | btrfs_abort_transaction(trans, root, ret); | |
3259 | return ret; | |
3260 | } | |
d68fc57b YZ |
3261 | } |
3262 | return 0; | |
7b128766 JB |
3263 | } |
3264 | ||
3265 | /* | |
3266 | * We have done the truncate/delete so we can go ahead and remove the orphan | |
3267 | * item for this particular inode. | |
3268 | */ | |
48a3b636 ES |
3269 | static int btrfs_orphan_del(struct btrfs_trans_handle *trans, |
3270 | struct inode *inode) | |
7b128766 JB |
3271 | { |
3272 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
d68fc57b YZ |
3273 | int delete_item = 0; |
3274 | int release_rsv = 0; | |
7b128766 JB |
3275 | int ret = 0; |
3276 | ||
d68fc57b | 3277 | spin_lock(&root->orphan_lock); |
8a35d95f JB |
3278 | if (test_and_clear_bit(BTRFS_INODE_HAS_ORPHAN_ITEM, |
3279 | &BTRFS_I(inode)->runtime_flags)) | |
d68fc57b | 3280 | delete_item = 1; |
7b128766 | 3281 | |
72ac3c0d JB |
3282 | if (test_and_clear_bit(BTRFS_INODE_ORPHAN_META_RESERVED, |
3283 | &BTRFS_I(inode)->runtime_flags)) | |
d68fc57b | 3284 | release_rsv = 1; |
d68fc57b | 3285 | spin_unlock(&root->orphan_lock); |
7b128766 | 3286 | |
703c88e0 | 3287 | if (delete_item) { |
8a35d95f | 3288 | atomic_dec(&root->orphan_inodes); |
703c88e0 FDBM |
3289 | if (trans) |
3290 | ret = btrfs_del_orphan_item(trans, root, | |
3291 | btrfs_ino(inode)); | |
8a35d95f | 3292 | } |
7b128766 | 3293 | |
703c88e0 FDBM |
3294 | if (release_rsv) |
3295 | btrfs_orphan_release_metadata(inode); | |
3296 | ||
4ef31a45 | 3297 | return ret; |
7b128766 JB |
3298 | } |
3299 | ||
3300 | /* | |
3301 | * this cleans up any orphans that may be left on the list from the last use | |
3302 | * of this root. | |
3303 | */ | |
66b4ffd1 | 3304 | int btrfs_orphan_cleanup(struct btrfs_root *root) |
7b128766 JB |
3305 | { |
3306 | struct btrfs_path *path; | |
3307 | struct extent_buffer *leaf; | |
7b128766 JB |
3308 | struct btrfs_key key, found_key; |
3309 | struct btrfs_trans_handle *trans; | |
3310 | struct inode *inode; | |
8f6d7f4f | 3311 | u64 last_objectid = 0; |
7b128766 JB |
3312 | int ret = 0, nr_unlink = 0, nr_truncate = 0; |
3313 | ||
d68fc57b | 3314 | if (cmpxchg(&root->orphan_cleanup_state, 0, ORPHAN_CLEANUP_STARTED)) |
66b4ffd1 | 3315 | return 0; |
c71bf099 YZ |
3316 | |
3317 | path = btrfs_alloc_path(); | |
66b4ffd1 JB |
3318 | if (!path) { |
3319 | ret = -ENOMEM; | |
3320 | goto out; | |
3321 | } | |
7b128766 JB |
3322 | path->reada = -1; |
3323 | ||
3324 | key.objectid = BTRFS_ORPHAN_OBJECTID; | |
962a298f | 3325 | key.type = BTRFS_ORPHAN_ITEM_KEY; |
7b128766 JB |
3326 | key.offset = (u64)-1; |
3327 | ||
7b128766 JB |
3328 | while (1) { |
3329 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); | |
66b4ffd1 JB |
3330 | if (ret < 0) |
3331 | goto out; | |
7b128766 JB |
3332 | |
3333 | /* | |
3334 | * if ret == 0 means we found what we were searching for, which | |
25985edc | 3335 | * is weird, but possible, so only screw with path if we didn't |
7b128766 JB |
3336 | * find the key and see if we have stuff that matches |
3337 | */ | |
3338 | if (ret > 0) { | |
66b4ffd1 | 3339 | ret = 0; |
7b128766 JB |
3340 | if (path->slots[0] == 0) |
3341 | break; | |
3342 | path->slots[0]--; | |
3343 | } | |
3344 | ||
3345 | /* pull out the item */ | |
3346 | leaf = path->nodes[0]; | |
7b128766 JB |
3347 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); |
3348 | ||
3349 | /* make sure the item matches what we want */ | |
3350 | if (found_key.objectid != BTRFS_ORPHAN_OBJECTID) | |
3351 | break; | |
962a298f | 3352 | if (found_key.type != BTRFS_ORPHAN_ITEM_KEY) |
7b128766 JB |
3353 | break; |
3354 | ||
3355 | /* release the path since we're done with it */ | |
b3b4aa74 | 3356 | btrfs_release_path(path); |
7b128766 JB |
3357 | |
3358 | /* | |
3359 | * this is where we are basically btrfs_lookup, without the | |
3360 | * crossing root thing. we store the inode number in the | |
3361 | * offset of the orphan item. | |
3362 | */ | |
8f6d7f4f JB |
3363 | |
3364 | if (found_key.offset == last_objectid) { | |
c2cf52eb SK |
3365 | btrfs_err(root->fs_info, |
3366 | "Error removing orphan entry, stopping orphan cleanup"); | |
8f6d7f4f JB |
3367 | ret = -EINVAL; |
3368 | goto out; | |
3369 | } | |
3370 | ||
3371 | last_objectid = found_key.offset; | |
3372 | ||
5d4f98a2 YZ |
3373 | found_key.objectid = found_key.offset; |
3374 | found_key.type = BTRFS_INODE_ITEM_KEY; | |
3375 | found_key.offset = 0; | |
73f73415 | 3376 | inode = btrfs_iget(root->fs_info->sb, &found_key, root, NULL); |
8c6ffba0 | 3377 | ret = PTR_ERR_OR_ZERO(inode); |
a8c9e576 | 3378 | if (ret && ret != -ESTALE) |
66b4ffd1 | 3379 | goto out; |
7b128766 | 3380 | |
f8e9e0b0 AJ |
3381 | if (ret == -ESTALE && root == root->fs_info->tree_root) { |
3382 | struct btrfs_root *dead_root; | |
3383 | struct btrfs_fs_info *fs_info = root->fs_info; | |
3384 | int is_dead_root = 0; | |
3385 | ||
3386 | /* | |
3387 | * this is an orphan in the tree root. Currently these | |
3388 | * could come from 2 sources: | |
3389 | * a) a snapshot deletion in progress | |
3390 | * b) a free space cache inode | |
3391 | * We need to distinguish those two, as the snapshot | |
3392 | * orphan must not get deleted. | |
3393 | * find_dead_roots already ran before us, so if this | |
3394 | * is a snapshot deletion, we should find the root | |
3395 | * in the dead_roots list | |
3396 | */ | |
3397 | spin_lock(&fs_info->trans_lock); | |
3398 | list_for_each_entry(dead_root, &fs_info->dead_roots, | |
3399 | root_list) { | |
3400 | if (dead_root->root_key.objectid == | |
3401 | found_key.objectid) { | |
3402 | is_dead_root = 1; | |
3403 | break; | |
3404 | } | |
3405 | } | |
3406 | spin_unlock(&fs_info->trans_lock); | |
3407 | if (is_dead_root) { | |
3408 | /* prevent this orphan from being found again */ | |
3409 | key.offset = found_key.objectid - 1; | |
3410 | continue; | |
3411 | } | |
3412 | } | |
7b128766 | 3413 | /* |
a8c9e576 JB |
3414 | * Inode is already gone but the orphan item is still there, |
3415 | * kill the orphan item. | |
7b128766 | 3416 | */ |
a8c9e576 JB |
3417 | if (ret == -ESTALE) { |
3418 | trans = btrfs_start_transaction(root, 1); | |
66b4ffd1 JB |
3419 | if (IS_ERR(trans)) { |
3420 | ret = PTR_ERR(trans); | |
3421 | goto out; | |
3422 | } | |
c2cf52eb SK |
3423 | btrfs_debug(root->fs_info, "auto deleting %Lu", |
3424 | found_key.objectid); | |
a8c9e576 JB |
3425 | ret = btrfs_del_orphan_item(trans, root, |
3426 | found_key.objectid); | |
5b21f2ed | 3427 | btrfs_end_transaction(trans, root); |
4ef31a45 JB |
3428 | if (ret) |
3429 | goto out; | |
7b128766 JB |
3430 | continue; |
3431 | } | |
3432 | ||
a8c9e576 JB |
3433 | /* |
3434 | * add this inode to the orphan list so btrfs_orphan_del does | |
3435 | * the proper thing when we hit it | |
3436 | */ | |
8a35d95f JB |
3437 | set_bit(BTRFS_INODE_HAS_ORPHAN_ITEM, |
3438 | &BTRFS_I(inode)->runtime_flags); | |
925396ec | 3439 | atomic_inc(&root->orphan_inodes); |
a8c9e576 | 3440 | |
7b128766 JB |
3441 | /* if we have links, this was a truncate, lets do that */ |
3442 | if (inode->i_nlink) { | |
fae7f21c | 3443 | if (WARN_ON(!S_ISREG(inode->i_mode))) { |
a41ad394 JB |
3444 | iput(inode); |
3445 | continue; | |
3446 | } | |
7b128766 | 3447 | nr_truncate++; |
f3fe820c JB |
3448 | |
3449 | /* 1 for the orphan item deletion. */ | |
3450 | trans = btrfs_start_transaction(root, 1); | |
3451 | if (IS_ERR(trans)) { | |
c69b26b0 | 3452 | iput(inode); |
f3fe820c JB |
3453 | ret = PTR_ERR(trans); |
3454 | goto out; | |
3455 | } | |
3456 | ret = btrfs_orphan_add(trans, inode); | |
3457 | btrfs_end_transaction(trans, root); | |
c69b26b0 JB |
3458 | if (ret) { |
3459 | iput(inode); | |
f3fe820c | 3460 | goto out; |
c69b26b0 | 3461 | } |
f3fe820c | 3462 | |
66b4ffd1 | 3463 | ret = btrfs_truncate(inode); |
4a7d0f68 JB |
3464 | if (ret) |
3465 | btrfs_orphan_del(NULL, inode); | |
7b128766 JB |
3466 | } else { |
3467 | nr_unlink++; | |
3468 | } | |
3469 | ||
3470 | /* this will do delete_inode and everything for us */ | |
3471 | iput(inode); | |
66b4ffd1 JB |
3472 | if (ret) |
3473 | goto out; | |
7b128766 | 3474 | } |
3254c876 MX |
3475 | /* release the path since we're done with it */ |
3476 | btrfs_release_path(path); | |
3477 | ||
d68fc57b YZ |
3478 | root->orphan_cleanup_state = ORPHAN_CLEANUP_DONE; |
3479 | ||
3480 | if (root->orphan_block_rsv) | |
3481 | btrfs_block_rsv_release(root, root->orphan_block_rsv, | |
3482 | (u64)-1); | |
3483 | ||
27cdeb70 MX |
3484 | if (root->orphan_block_rsv || |
3485 | test_bit(BTRFS_ROOT_ORPHAN_ITEM_INSERTED, &root->state)) { | |
7a7eaa40 | 3486 | trans = btrfs_join_transaction(root); |
66b4ffd1 JB |
3487 | if (!IS_ERR(trans)) |
3488 | btrfs_end_transaction(trans, root); | |
d68fc57b | 3489 | } |
7b128766 JB |
3490 | |
3491 | if (nr_unlink) | |
4884b476 | 3492 | btrfs_debug(root->fs_info, "unlinked %d orphans", nr_unlink); |
7b128766 | 3493 | if (nr_truncate) |
4884b476 | 3494 | btrfs_debug(root->fs_info, "truncated %d orphans", nr_truncate); |
66b4ffd1 JB |
3495 | |
3496 | out: | |
3497 | if (ret) | |
68b663d1 | 3498 | btrfs_err(root->fs_info, |
c2cf52eb | 3499 | "could not do orphan cleanup %d", ret); |
66b4ffd1 JB |
3500 | btrfs_free_path(path); |
3501 | return ret; | |
7b128766 JB |
3502 | } |
3503 | ||
46a53cca CM |
3504 | /* |
3505 | * very simple check to peek ahead in the leaf looking for xattrs. If we | |
3506 | * don't find any xattrs, we know there can't be any acls. | |
3507 | * | |
3508 | * slot is the slot the inode is in, objectid is the objectid of the inode | |
3509 | */ | |
3510 | static noinline int acls_after_inode_item(struct extent_buffer *leaf, | |
63541927 FDBM |
3511 | int slot, u64 objectid, |
3512 | int *first_xattr_slot) | |
46a53cca CM |
3513 | { |
3514 | u32 nritems = btrfs_header_nritems(leaf); | |
3515 | struct btrfs_key found_key; | |
f23b5a59 JB |
3516 | static u64 xattr_access = 0; |
3517 | static u64 xattr_default = 0; | |
46a53cca CM |
3518 | int scanned = 0; |
3519 | ||
f23b5a59 JB |
3520 | if (!xattr_access) { |
3521 | xattr_access = btrfs_name_hash(POSIX_ACL_XATTR_ACCESS, | |
3522 | strlen(POSIX_ACL_XATTR_ACCESS)); | |
3523 | xattr_default = btrfs_name_hash(POSIX_ACL_XATTR_DEFAULT, | |
3524 | strlen(POSIX_ACL_XATTR_DEFAULT)); | |
3525 | } | |
3526 | ||
46a53cca | 3527 | slot++; |
63541927 | 3528 | *first_xattr_slot = -1; |
46a53cca CM |
3529 | while (slot < nritems) { |
3530 | btrfs_item_key_to_cpu(leaf, &found_key, slot); | |
3531 | ||
3532 | /* we found a different objectid, there must not be acls */ | |
3533 | if (found_key.objectid != objectid) | |
3534 | return 0; | |
3535 | ||
3536 | /* we found an xattr, assume we've got an acl */ | |
f23b5a59 | 3537 | if (found_key.type == BTRFS_XATTR_ITEM_KEY) { |
63541927 FDBM |
3538 | if (*first_xattr_slot == -1) |
3539 | *first_xattr_slot = slot; | |
f23b5a59 JB |
3540 | if (found_key.offset == xattr_access || |
3541 | found_key.offset == xattr_default) | |
3542 | return 1; | |
3543 | } | |
46a53cca CM |
3544 | |
3545 | /* | |
3546 | * we found a key greater than an xattr key, there can't | |
3547 | * be any acls later on | |
3548 | */ | |
3549 | if (found_key.type > BTRFS_XATTR_ITEM_KEY) | |
3550 | return 0; | |
3551 | ||
3552 | slot++; | |
3553 | scanned++; | |
3554 | ||
3555 | /* | |
3556 | * it goes inode, inode backrefs, xattrs, extents, | |
3557 | * so if there are a ton of hard links to an inode there can | |
3558 | * be a lot of backrefs. Don't waste time searching too hard, | |
3559 | * this is just an optimization | |
3560 | */ | |
3561 | if (scanned >= 8) | |
3562 | break; | |
3563 | } | |
3564 | /* we hit the end of the leaf before we found an xattr or | |
3565 | * something larger than an xattr. We have to assume the inode | |
3566 | * has acls | |
3567 | */ | |
63541927 FDBM |
3568 | if (*first_xattr_slot == -1) |
3569 | *first_xattr_slot = slot; | |
46a53cca CM |
3570 | return 1; |
3571 | } | |
3572 | ||
d352ac68 CM |
3573 | /* |
3574 | * read an inode from the btree into the in-memory inode | |
3575 | */ | |
5d4f98a2 | 3576 | static void btrfs_read_locked_inode(struct inode *inode) |
39279cc3 CM |
3577 | { |
3578 | struct btrfs_path *path; | |
5f39d397 | 3579 | struct extent_buffer *leaf; |
39279cc3 CM |
3580 | struct btrfs_inode_item *inode_item; |
3581 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
3582 | struct btrfs_key location; | |
67de1176 | 3583 | unsigned long ptr; |
46a53cca | 3584 | int maybe_acls; |
618e21d5 | 3585 | u32 rdev; |
39279cc3 | 3586 | int ret; |
2f7e33d4 | 3587 | bool filled = false; |
63541927 | 3588 | int first_xattr_slot; |
2f7e33d4 MX |
3589 | |
3590 | ret = btrfs_fill_inode(inode, &rdev); | |
3591 | if (!ret) | |
3592 | filled = true; | |
39279cc3 CM |
3593 | |
3594 | path = btrfs_alloc_path(); | |
1748f843 MF |
3595 | if (!path) |
3596 | goto make_bad; | |
3597 | ||
39279cc3 | 3598 | memcpy(&location, &BTRFS_I(inode)->location, sizeof(location)); |
dc17ff8f | 3599 | |
39279cc3 | 3600 | ret = btrfs_lookup_inode(NULL, root, path, &location, 0); |
5f39d397 | 3601 | if (ret) |
39279cc3 | 3602 | goto make_bad; |
39279cc3 | 3603 | |
5f39d397 | 3604 | leaf = path->nodes[0]; |
2f7e33d4 MX |
3605 | |
3606 | if (filled) | |
67de1176 | 3607 | goto cache_index; |
2f7e33d4 | 3608 | |
5f39d397 CM |
3609 | inode_item = btrfs_item_ptr(leaf, path->slots[0], |
3610 | struct btrfs_inode_item); | |
5f39d397 | 3611 | inode->i_mode = btrfs_inode_mode(leaf, inode_item); |
bfe86848 | 3612 | set_nlink(inode, btrfs_inode_nlink(leaf, inode_item)); |
2f2f43d3 EB |
3613 | i_uid_write(inode, btrfs_inode_uid(leaf, inode_item)); |
3614 | i_gid_write(inode, btrfs_inode_gid(leaf, inode_item)); | |
dbe674a9 | 3615 | btrfs_i_size_write(inode, btrfs_inode_size(leaf, inode_item)); |
5f39d397 | 3616 | |
a937b979 DS |
3617 | inode->i_atime.tv_sec = btrfs_timespec_sec(leaf, &inode_item->atime); |
3618 | inode->i_atime.tv_nsec = btrfs_timespec_nsec(leaf, &inode_item->atime); | |
5f39d397 | 3619 | |
a937b979 DS |
3620 | inode->i_mtime.tv_sec = btrfs_timespec_sec(leaf, &inode_item->mtime); |
3621 | inode->i_mtime.tv_nsec = btrfs_timespec_nsec(leaf, &inode_item->mtime); | |
5f39d397 | 3622 | |
a937b979 DS |
3623 | inode->i_ctime.tv_sec = btrfs_timespec_sec(leaf, &inode_item->ctime); |
3624 | inode->i_ctime.tv_nsec = btrfs_timespec_nsec(leaf, &inode_item->ctime); | |
5f39d397 | 3625 | |
9cc97d64 | 3626 | BTRFS_I(inode)->i_otime.tv_sec = |
3627 | btrfs_timespec_sec(leaf, &inode_item->otime); | |
3628 | BTRFS_I(inode)->i_otime.tv_nsec = | |
3629 | btrfs_timespec_nsec(leaf, &inode_item->otime); | |
5f39d397 | 3630 | |
a76a3cd4 | 3631 | inode_set_bytes(inode, btrfs_inode_nbytes(leaf, inode_item)); |
e02119d5 | 3632 | BTRFS_I(inode)->generation = btrfs_inode_generation(leaf, inode_item); |
5dc562c5 JB |
3633 | BTRFS_I(inode)->last_trans = btrfs_inode_transid(leaf, inode_item); |
3634 | ||
6e17d30b YD |
3635 | inode->i_version = btrfs_inode_sequence(leaf, inode_item); |
3636 | inode->i_generation = BTRFS_I(inode)->generation; | |
3637 | inode->i_rdev = 0; | |
3638 | rdev = btrfs_inode_rdev(leaf, inode_item); | |
3639 | ||
3640 | BTRFS_I(inode)->index_cnt = (u64)-1; | |
3641 | BTRFS_I(inode)->flags = btrfs_inode_flags(leaf, inode_item); | |
3642 | ||
3643 | cache_index: | |
5dc562c5 JB |
3644 | /* |
3645 | * If we were modified in the current generation and evicted from memory | |
3646 | * and then re-read we need to do a full sync since we don't have any | |
3647 | * idea about which extents were modified before we were evicted from | |
3648 | * cache. | |
6e17d30b YD |
3649 | * |
3650 | * This is required for both inode re-read from disk and delayed inode | |
3651 | * in delayed_nodes_tree. | |
5dc562c5 JB |
3652 | */ |
3653 | if (BTRFS_I(inode)->last_trans == root->fs_info->generation) | |
3654 | set_bit(BTRFS_INODE_NEEDS_FULL_SYNC, | |
3655 | &BTRFS_I(inode)->runtime_flags); | |
3656 | ||
67de1176 MX |
3657 | path->slots[0]++; |
3658 | if (inode->i_nlink != 1 || | |
3659 | path->slots[0] >= btrfs_header_nritems(leaf)) | |
3660 | goto cache_acl; | |
3661 | ||
3662 | btrfs_item_key_to_cpu(leaf, &location, path->slots[0]); | |
3663 | if (location.objectid != btrfs_ino(inode)) | |
3664 | goto cache_acl; | |
3665 | ||
3666 | ptr = btrfs_item_ptr_offset(leaf, path->slots[0]); | |
3667 | if (location.type == BTRFS_INODE_REF_KEY) { | |
3668 | struct btrfs_inode_ref *ref; | |
3669 | ||
3670 | ref = (struct btrfs_inode_ref *)ptr; | |
3671 | BTRFS_I(inode)->dir_index = btrfs_inode_ref_index(leaf, ref); | |
3672 | } else if (location.type == BTRFS_INODE_EXTREF_KEY) { | |
3673 | struct btrfs_inode_extref *extref; | |
3674 | ||
3675 | extref = (struct btrfs_inode_extref *)ptr; | |
3676 | BTRFS_I(inode)->dir_index = btrfs_inode_extref_index(leaf, | |
3677 | extref); | |
3678 | } | |
2f7e33d4 | 3679 | cache_acl: |
46a53cca CM |
3680 | /* |
3681 | * try to precache a NULL acl entry for files that don't have | |
3682 | * any xattrs or acls | |
3683 | */ | |
33345d01 | 3684 | maybe_acls = acls_after_inode_item(leaf, path->slots[0], |
63541927 FDBM |
3685 | btrfs_ino(inode), &first_xattr_slot); |
3686 | if (first_xattr_slot != -1) { | |
3687 | path->slots[0] = first_xattr_slot; | |
3688 | ret = btrfs_load_inode_props(inode, path); | |
3689 | if (ret) | |
3690 | btrfs_err(root->fs_info, | |
351fd353 | 3691 | "error loading props for ino %llu (root %llu): %d", |
63541927 FDBM |
3692 | btrfs_ino(inode), |
3693 | root->root_key.objectid, ret); | |
3694 | } | |
3695 | btrfs_free_path(path); | |
3696 | ||
72c04902 AV |
3697 | if (!maybe_acls) |
3698 | cache_no_acl(inode); | |
46a53cca | 3699 | |
39279cc3 | 3700 | switch (inode->i_mode & S_IFMT) { |
39279cc3 CM |
3701 | case S_IFREG: |
3702 | inode->i_mapping->a_ops = &btrfs_aops; | |
d1310b2e | 3703 | BTRFS_I(inode)->io_tree.ops = &btrfs_extent_io_ops; |
39279cc3 CM |
3704 | inode->i_fop = &btrfs_file_operations; |
3705 | inode->i_op = &btrfs_file_inode_operations; | |
3706 | break; | |
3707 | case S_IFDIR: | |
3708 | inode->i_fop = &btrfs_dir_file_operations; | |
3709 | if (root == root->fs_info->tree_root) | |
3710 | inode->i_op = &btrfs_dir_ro_inode_operations; | |
3711 | else | |
3712 | inode->i_op = &btrfs_dir_inode_operations; | |
3713 | break; | |
3714 | case S_IFLNK: | |
3715 | inode->i_op = &btrfs_symlink_inode_operations; | |
3716 | inode->i_mapping->a_ops = &btrfs_symlink_aops; | |
3717 | break; | |
618e21d5 | 3718 | default: |
0279b4cd | 3719 | inode->i_op = &btrfs_special_inode_operations; |
618e21d5 JB |
3720 | init_special_inode(inode, inode->i_mode, rdev); |
3721 | break; | |
39279cc3 | 3722 | } |
6cbff00f CH |
3723 | |
3724 | btrfs_update_iflags(inode); | |
39279cc3 CM |
3725 | return; |
3726 | ||
3727 | make_bad: | |
39279cc3 | 3728 | btrfs_free_path(path); |
39279cc3 CM |
3729 | make_bad_inode(inode); |
3730 | } | |
3731 | ||
d352ac68 CM |
3732 | /* |
3733 | * given a leaf and an inode, copy the inode fields into the leaf | |
3734 | */ | |
e02119d5 CM |
3735 | static void fill_inode_item(struct btrfs_trans_handle *trans, |
3736 | struct extent_buffer *leaf, | |
5f39d397 | 3737 | struct btrfs_inode_item *item, |
39279cc3 CM |
3738 | struct inode *inode) |
3739 | { | |
51fab693 LB |
3740 | struct btrfs_map_token token; |
3741 | ||
3742 | btrfs_init_map_token(&token); | |
5f39d397 | 3743 | |
51fab693 LB |
3744 | btrfs_set_token_inode_uid(leaf, item, i_uid_read(inode), &token); |
3745 | btrfs_set_token_inode_gid(leaf, item, i_gid_read(inode), &token); | |
3746 | btrfs_set_token_inode_size(leaf, item, BTRFS_I(inode)->disk_i_size, | |
3747 | &token); | |
3748 | btrfs_set_token_inode_mode(leaf, item, inode->i_mode, &token); | |
3749 | btrfs_set_token_inode_nlink(leaf, item, inode->i_nlink, &token); | |
5f39d397 | 3750 | |
a937b979 | 3751 | btrfs_set_token_timespec_sec(leaf, &item->atime, |
51fab693 | 3752 | inode->i_atime.tv_sec, &token); |
a937b979 | 3753 | btrfs_set_token_timespec_nsec(leaf, &item->atime, |
51fab693 | 3754 | inode->i_atime.tv_nsec, &token); |
5f39d397 | 3755 | |
a937b979 | 3756 | btrfs_set_token_timespec_sec(leaf, &item->mtime, |
51fab693 | 3757 | inode->i_mtime.tv_sec, &token); |
a937b979 | 3758 | btrfs_set_token_timespec_nsec(leaf, &item->mtime, |
51fab693 | 3759 | inode->i_mtime.tv_nsec, &token); |
5f39d397 | 3760 | |
a937b979 | 3761 | btrfs_set_token_timespec_sec(leaf, &item->ctime, |
51fab693 | 3762 | inode->i_ctime.tv_sec, &token); |
a937b979 | 3763 | btrfs_set_token_timespec_nsec(leaf, &item->ctime, |
51fab693 | 3764 | inode->i_ctime.tv_nsec, &token); |
5f39d397 | 3765 | |
9cc97d64 | 3766 | btrfs_set_token_timespec_sec(leaf, &item->otime, |
3767 | BTRFS_I(inode)->i_otime.tv_sec, &token); | |
3768 | btrfs_set_token_timespec_nsec(leaf, &item->otime, | |
3769 | BTRFS_I(inode)->i_otime.tv_nsec, &token); | |
3770 | ||
51fab693 LB |
3771 | btrfs_set_token_inode_nbytes(leaf, item, inode_get_bytes(inode), |
3772 | &token); | |
3773 | btrfs_set_token_inode_generation(leaf, item, BTRFS_I(inode)->generation, | |
3774 | &token); | |
3775 | btrfs_set_token_inode_sequence(leaf, item, inode->i_version, &token); | |
3776 | btrfs_set_token_inode_transid(leaf, item, trans->transid, &token); | |
3777 | btrfs_set_token_inode_rdev(leaf, item, inode->i_rdev, &token); | |
3778 | btrfs_set_token_inode_flags(leaf, item, BTRFS_I(inode)->flags, &token); | |
3779 | btrfs_set_token_inode_block_group(leaf, item, 0, &token); | |
39279cc3 CM |
3780 | } |
3781 | ||
d352ac68 CM |
3782 | /* |
3783 | * copy everything in the in-memory inode into the btree. | |
3784 | */ | |
2115133f | 3785 | static noinline int btrfs_update_inode_item(struct btrfs_trans_handle *trans, |
d397712b | 3786 | struct btrfs_root *root, struct inode *inode) |
39279cc3 CM |
3787 | { |
3788 | struct btrfs_inode_item *inode_item; | |
3789 | struct btrfs_path *path; | |
5f39d397 | 3790 | struct extent_buffer *leaf; |
39279cc3 CM |
3791 | int ret; |
3792 | ||
3793 | path = btrfs_alloc_path(); | |
16cdcec7 MX |
3794 | if (!path) |
3795 | return -ENOMEM; | |
3796 | ||
b9473439 | 3797 | path->leave_spinning = 1; |
16cdcec7 MX |
3798 | ret = btrfs_lookup_inode(trans, root, path, &BTRFS_I(inode)->location, |
3799 | 1); | |
39279cc3 CM |
3800 | if (ret) { |
3801 | if (ret > 0) | |
3802 | ret = -ENOENT; | |
3803 | goto failed; | |
3804 | } | |
3805 | ||
5f39d397 CM |
3806 | leaf = path->nodes[0]; |
3807 | inode_item = btrfs_item_ptr(leaf, path->slots[0], | |
16cdcec7 | 3808 | struct btrfs_inode_item); |
39279cc3 | 3809 | |
e02119d5 | 3810 | fill_inode_item(trans, leaf, inode_item, inode); |
5f39d397 | 3811 | btrfs_mark_buffer_dirty(leaf); |
15ee9bc7 | 3812 | btrfs_set_inode_last_trans(trans, inode); |
39279cc3 CM |
3813 | ret = 0; |
3814 | failed: | |
39279cc3 CM |
3815 | btrfs_free_path(path); |
3816 | return ret; | |
3817 | } | |
3818 | ||
2115133f CM |
3819 | /* |
3820 | * copy everything in the in-memory inode into the btree. | |
3821 | */ | |
3822 | noinline int btrfs_update_inode(struct btrfs_trans_handle *trans, | |
3823 | struct btrfs_root *root, struct inode *inode) | |
3824 | { | |
3825 | int ret; | |
3826 | ||
3827 | /* | |
3828 | * If the inode is a free space inode, we can deadlock during commit | |
3829 | * if we put it into the delayed code. | |
3830 | * | |
3831 | * The data relocation inode should also be directly updated | |
3832 | * without delay | |
3833 | */ | |
83eea1f1 | 3834 | if (!btrfs_is_free_space_inode(inode) |
1d52c78a JB |
3835 | && root->root_key.objectid != BTRFS_DATA_RELOC_TREE_OBJECTID |
3836 | && !root->fs_info->log_root_recovering) { | |
8ea05e3a AB |
3837 | btrfs_update_root_times(trans, root); |
3838 | ||
2115133f CM |
3839 | ret = btrfs_delayed_update_inode(trans, root, inode); |
3840 | if (!ret) | |
3841 | btrfs_set_inode_last_trans(trans, inode); | |
3842 | return ret; | |
3843 | } | |
3844 | ||
3845 | return btrfs_update_inode_item(trans, root, inode); | |
3846 | } | |
3847 | ||
be6aef60 JB |
3848 | noinline int btrfs_update_inode_fallback(struct btrfs_trans_handle *trans, |
3849 | struct btrfs_root *root, | |
3850 | struct inode *inode) | |
2115133f CM |
3851 | { |
3852 | int ret; | |
3853 | ||
3854 | ret = btrfs_update_inode(trans, root, inode); | |
3855 | if (ret == -ENOSPC) | |
3856 | return btrfs_update_inode_item(trans, root, inode); | |
3857 | return ret; | |
3858 | } | |
3859 | ||
d352ac68 CM |
3860 | /* |
3861 | * unlink helper that gets used here in inode.c and in the tree logging | |
3862 | * recovery code. It remove a link in a directory with a given name, and | |
3863 | * also drops the back refs in the inode to the directory | |
3864 | */ | |
92986796 AV |
3865 | static int __btrfs_unlink_inode(struct btrfs_trans_handle *trans, |
3866 | struct btrfs_root *root, | |
3867 | struct inode *dir, struct inode *inode, | |
3868 | const char *name, int name_len) | |
39279cc3 CM |
3869 | { |
3870 | struct btrfs_path *path; | |
39279cc3 | 3871 | int ret = 0; |
5f39d397 | 3872 | struct extent_buffer *leaf; |
39279cc3 | 3873 | struct btrfs_dir_item *di; |
5f39d397 | 3874 | struct btrfs_key key; |
aec7477b | 3875 | u64 index; |
33345d01 LZ |
3876 | u64 ino = btrfs_ino(inode); |
3877 | u64 dir_ino = btrfs_ino(dir); | |
39279cc3 CM |
3878 | |
3879 | path = btrfs_alloc_path(); | |
54aa1f4d CM |
3880 | if (!path) { |
3881 | ret = -ENOMEM; | |
554233a6 | 3882 | goto out; |
54aa1f4d CM |
3883 | } |
3884 | ||
b9473439 | 3885 | path->leave_spinning = 1; |
33345d01 | 3886 | di = btrfs_lookup_dir_item(trans, root, path, dir_ino, |
39279cc3 CM |
3887 | name, name_len, -1); |
3888 | if (IS_ERR(di)) { | |
3889 | ret = PTR_ERR(di); | |
3890 | goto err; | |
3891 | } | |
3892 | if (!di) { | |
3893 | ret = -ENOENT; | |
3894 | goto err; | |
3895 | } | |
5f39d397 CM |
3896 | leaf = path->nodes[0]; |
3897 | btrfs_dir_item_key_to_cpu(leaf, di, &key); | |
39279cc3 | 3898 | ret = btrfs_delete_one_dir_name(trans, root, path, di); |
54aa1f4d CM |
3899 | if (ret) |
3900 | goto err; | |
b3b4aa74 | 3901 | btrfs_release_path(path); |
39279cc3 | 3902 | |
67de1176 MX |
3903 | /* |
3904 | * If we don't have dir index, we have to get it by looking up | |
3905 | * the inode ref, since we get the inode ref, remove it directly, | |
3906 | * it is unnecessary to do delayed deletion. | |
3907 | * | |
3908 | * But if we have dir index, needn't search inode ref to get it. | |
3909 | * Since the inode ref is close to the inode item, it is better | |
3910 | * that we delay to delete it, and just do this deletion when | |
3911 | * we update the inode item. | |
3912 | */ | |
3913 | if (BTRFS_I(inode)->dir_index) { | |
3914 | ret = btrfs_delayed_delete_inode_ref(inode); | |
3915 | if (!ret) { | |
3916 | index = BTRFS_I(inode)->dir_index; | |
3917 | goto skip_backref; | |
3918 | } | |
3919 | } | |
3920 | ||
33345d01 LZ |
3921 | ret = btrfs_del_inode_ref(trans, root, name, name_len, ino, |
3922 | dir_ino, &index); | |
aec7477b | 3923 | if (ret) { |
c2cf52eb SK |
3924 | btrfs_info(root->fs_info, |
3925 | "failed to delete reference to %.*s, inode %llu parent %llu", | |
c1c9ff7c | 3926 | name_len, name, ino, dir_ino); |
79787eaa | 3927 | btrfs_abort_transaction(trans, root, ret); |
aec7477b JB |
3928 | goto err; |
3929 | } | |
67de1176 | 3930 | skip_backref: |
16cdcec7 | 3931 | ret = btrfs_delete_delayed_dir_index(trans, root, dir, index); |
79787eaa JM |
3932 | if (ret) { |
3933 | btrfs_abort_transaction(trans, root, ret); | |
39279cc3 | 3934 | goto err; |
79787eaa | 3935 | } |
39279cc3 | 3936 | |
e02119d5 | 3937 | ret = btrfs_del_inode_ref_in_log(trans, root, name, name_len, |
33345d01 | 3938 | inode, dir_ino); |
79787eaa JM |
3939 | if (ret != 0 && ret != -ENOENT) { |
3940 | btrfs_abort_transaction(trans, root, ret); | |
3941 | goto err; | |
3942 | } | |
e02119d5 CM |
3943 | |
3944 | ret = btrfs_del_dir_entries_in_log(trans, root, name, name_len, | |
3945 | dir, index); | |
6418c961 CM |
3946 | if (ret == -ENOENT) |
3947 | ret = 0; | |
d4e3991b ZB |
3948 | else if (ret) |
3949 | btrfs_abort_transaction(trans, root, ret); | |
39279cc3 CM |
3950 | err: |
3951 | btrfs_free_path(path); | |
e02119d5 CM |
3952 | if (ret) |
3953 | goto out; | |
3954 | ||
3955 | btrfs_i_size_write(dir, dir->i_size - name_len * 2); | |
0c4d2d95 JB |
3956 | inode_inc_iversion(inode); |
3957 | inode_inc_iversion(dir); | |
e02119d5 | 3958 | inode->i_ctime = dir->i_mtime = dir->i_ctime = CURRENT_TIME; |
b9959295 | 3959 | ret = btrfs_update_inode(trans, root, dir); |
e02119d5 | 3960 | out: |
39279cc3 CM |
3961 | return ret; |
3962 | } | |
3963 | ||
92986796 AV |
3964 | int btrfs_unlink_inode(struct btrfs_trans_handle *trans, |
3965 | struct btrfs_root *root, | |
3966 | struct inode *dir, struct inode *inode, | |
3967 | const char *name, int name_len) | |
3968 | { | |
3969 | int ret; | |
3970 | ret = __btrfs_unlink_inode(trans, root, dir, inode, name, name_len); | |
3971 | if (!ret) { | |
8b558c5f | 3972 | drop_nlink(inode); |
92986796 AV |
3973 | ret = btrfs_update_inode(trans, root, inode); |
3974 | } | |
3975 | return ret; | |
3976 | } | |
39279cc3 | 3977 | |
a22285a6 YZ |
3978 | /* |
3979 | * helper to start transaction for unlink and rmdir. | |
3980 | * | |
d52be818 JB |
3981 | * unlink and rmdir are special in btrfs, they do not always free space, so |
3982 | * if we cannot make our reservations the normal way try and see if there is | |
3983 | * plenty of slack room in the global reserve to migrate, otherwise we cannot | |
3984 | * allow the unlink to occur. | |
a22285a6 | 3985 | */ |
d52be818 | 3986 | static struct btrfs_trans_handle *__unlink_start_trans(struct inode *dir) |
4df27c4d | 3987 | { |
39279cc3 | 3988 | struct btrfs_trans_handle *trans; |
a22285a6 | 3989 | struct btrfs_root *root = BTRFS_I(dir)->root; |
4df27c4d YZ |
3990 | int ret; |
3991 | ||
e70bea5f JB |
3992 | /* |
3993 | * 1 for the possible orphan item | |
3994 | * 1 for the dir item | |
3995 | * 1 for the dir index | |
3996 | * 1 for the inode ref | |
e70bea5f JB |
3997 | * 1 for the inode |
3998 | */ | |
6e137ed3 | 3999 | trans = btrfs_start_transaction(root, 5); |
a22285a6 YZ |
4000 | if (!IS_ERR(trans) || PTR_ERR(trans) != -ENOSPC) |
4001 | return trans; | |
4df27c4d | 4002 | |
d52be818 JB |
4003 | if (PTR_ERR(trans) == -ENOSPC) { |
4004 | u64 num_bytes = btrfs_calc_trans_metadata_size(root, 5); | |
4df27c4d | 4005 | |
d52be818 JB |
4006 | trans = btrfs_start_transaction(root, 0); |
4007 | if (IS_ERR(trans)) | |
4008 | return trans; | |
4009 | ret = btrfs_cond_migrate_bytes(root->fs_info, | |
4010 | &root->fs_info->trans_block_rsv, | |
4011 | num_bytes, 5); | |
4012 | if (ret) { | |
4013 | btrfs_end_transaction(trans, root); | |
4014 | return ERR_PTR(ret); | |
a22285a6 | 4015 | } |
5a77d76c | 4016 | trans->block_rsv = &root->fs_info->trans_block_rsv; |
d52be818 | 4017 | trans->bytes_reserved = num_bytes; |
a22285a6 | 4018 | } |
d52be818 | 4019 | return trans; |
a22285a6 YZ |
4020 | } |
4021 | ||
4022 | static int btrfs_unlink(struct inode *dir, struct dentry *dentry) | |
4023 | { | |
4024 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
4025 | struct btrfs_trans_handle *trans; | |
2b0143b5 | 4026 | struct inode *inode = d_inode(dentry); |
a22285a6 | 4027 | int ret; |
a22285a6 | 4028 | |
d52be818 | 4029 | trans = __unlink_start_trans(dir); |
a22285a6 YZ |
4030 | if (IS_ERR(trans)) |
4031 | return PTR_ERR(trans); | |
5f39d397 | 4032 | |
2b0143b5 | 4033 | btrfs_record_unlink_dir(trans, dir, d_inode(dentry), 0); |
12fcfd22 | 4034 | |
2b0143b5 | 4035 | ret = btrfs_unlink_inode(trans, root, dir, d_inode(dentry), |
e02119d5 | 4036 | dentry->d_name.name, dentry->d_name.len); |
b532402e TI |
4037 | if (ret) |
4038 | goto out; | |
7b128766 | 4039 | |
a22285a6 | 4040 | if (inode->i_nlink == 0) { |
7b128766 | 4041 | ret = btrfs_orphan_add(trans, inode); |
b532402e TI |
4042 | if (ret) |
4043 | goto out; | |
a22285a6 | 4044 | } |
7b128766 | 4045 | |
b532402e | 4046 | out: |
d52be818 | 4047 | btrfs_end_transaction(trans, root); |
b53d3f5d | 4048 | btrfs_btree_balance_dirty(root); |
39279cc3 CM |
4049 | return ret; |
4050 | } | |
4051 | ||
4df27c4d YZ |
4052 | int btrfs_unlink_subvol(struct btrfs_trans_handle *trans, |
4053 | struct btrfs_root *root, | |
4054 | struct inode *dir, u64 objectid, | |
4055 | const char *name, int name_len) | |
4056 | { | |
4057 | struct btrfs_path *path; | |
4058 | struct extent_buffer *leaf; | |
4059 | struct btrfs_dir_item *di; | |
4060 | struct btrfs_key key; | |
4061 | u64 index; | |
4062 | int ret; | |
33345d01 | 4063 | u64 dir_ino = btrfs_ino(dir); |
4df27c4d YZ |
4064 | |
4065 | path = btrfs_alloc_path(); | |
4066 | if (!path) | |
4067 | return -ENOMEM; | |
4068 | ||
33345d01 | 4069 | di = btrfs_lookup_dir_item(trans, root, path, dir_ino, |
4df27c4d | 4070 | name, name_len, -1); |
79787eaa JM |
4071 | if (IS_ERR_OR_NULL(di)) { |
4072 | if (!di) | |
4073 | ret = -ENOENT; | |
4074 | else | |
4075 | ret = PTR_ERR(di); | |
4076 | goto out; | |
4077 | } | |
4df27c4d YZ |
4078 | |
4079 | leaf = path->nodes[0]; | |
4080 | btrfs_dir_item_key_to_cpu(leaf, di, &key); | |
4081 | WARN_ON(key.type != BTRFS_ROOT_ITEM_KEY || key.objectid != objectid); | |
4082 | ret = btrfs_delete_one_dir_name(trans, root, path, di); | |
79787eaa JM |
4083 | if (ret) { |
4084 | btrfs_abort_transaction(trans, root, ret); | |
4085 | goto out; | |
4086 | } | |
b3b4aa74 | 4087 | btrfs_release_path(path); |
4df27c4d YZ |
4088 | |
4089 | ret = btrfs_del_root_ref(trans, root->fs_info->tree_root, | |
4090 | objectid, root->root_key.objectid, | |
33345d01 | 4091 | dir_ino, &index, name, name_len); |
4df27c4d | 4092 | if (ret < 0) { |
79787eaa JM |
4093 | if (ret != -ENOENT) { |
4094 | btrfs_abort_transaction(trans, root, ret); | |
4095 | goto out; | |
4096 | } | |
33345d01 | 4097 | di = btrfs_search_dir_index_item(root, path, dir_ino, |
4df27c4d | 4098 | name, name_len); |
79787eaa JM |
4099 | if (IS_ERR_OR_NULL(di)) { |
4100 | if (!di) | |
4101 | ret = -ENOENT; | |
4102 | else | |
4103 | ret = PTR_ERR(di); | |
4104 | btrfs_abort_transaction(trans, root, ret); | |
4105 | goto out; | |
4106 | } | |
4df27c4d YZ |
4107 | |
4108 | leaf = path->nodes[0]; | |
4109 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); | |
b3b4aa74 | 4110 | btrfs_release_path(path); |
4df27c4d YZ |
4111 | index = key.offset; |
4112 | } | |
945d8962 | 4113 | btrfs_release_path(path); |
4df27c4d | 4114 | |
16cdcec7 | 4115 | ret = btrfs_delete_delayed_dir_index(trans, root, dir, index); |
79787eaa JM |
4116 | if (ret) { |
4117 | btrfs_abort_transaction(trans, root, ret); | |
4118 | goto out; | |
4119 | } | |
4df27c4d YZ |
4120 | |
4121 | btrfs_i_size_write(dir, dir->i_size - name_len * 2); | |
0c4d2d95 | 4122 | inode_inc_iversion(dir); |
4df27c4d | 4123 | dir->i_mtime = dir->i_ctime = CURRENT_TIME; |
5a24e84c | 4124 | ret = btrfs_update_inode_fallback(trans, root, dir); |
79787eaa JM |
4125 | if (ret) |
4126 | btrfs_abort_transaction(trans, root, ret); | |
4127 | out: | |
71d7aed0 | 4128 | btrfs_free_path(path); |
79787eaa | 4129 | return ret; |
4df27c4d YZ |
4130 | } |
4131 | ||
39279cc3 CM |
4132 | static int btrfs_rmdir(struct inode *dir, struct dentry *dentry) |
4133 | { | |
2b0143b5 | 4134 | struct inode *inode = d_inode(dentry); |
1832a6d5 | 4135 | int err = 0; |
39279cc3 | 4136 | struct btrfs_root *root = BTRFS_I(dir)->root; |
39279cc3 | 4137 | struct btrfs_trans_handle *trans; |
39279cc3 | 4138 | |
b3ae244e | 4139 | if (inode->i_size > BTRFS_EMPTY_DIR_SIZE) |
134d4512 | 4140 | return -ENOTEMPTY; |
b3ae244e DS |
4141 | if (btrfs_ino(inode) == BTRFS_FIRST_FREE_OBJECTID) |
4142 | return -EPERM; | |
134d4512 | 4143 | |
d52be818 | 4144 | trans = __unlink_start_trans(dir); |
a22285a6 | 4145 | if (IS_ERR(trans)) |
5df6a9f6 | 4146 | return PTR_ERR(trans); |
5df6a9f6 | 4147 | |
33345d01 | 4148 | if (unlikely(btrfs_ino(inode) == BTRFS_EMPTY_SUBVOL_DIR_OBJECTID)) { |
4df27c4d YZ |
4149 | err = btrfs_unlink_subvol(trans, root, dir, |
4150 | BTRFS_I(inode)->location.objectid, | |
4151 | dentry->d_name.name, | |
4152 | dentry->d_name.len); | |
4153 | goto out; | |
4154 | } | |
4155 | ||
7b128766 JB |
4156 | err = btrfs_orphan_add(trans, inode); |
4157 | if (err) | |
4df27c4d | 4158 | goto out; |
7b128766 | 4159 | |
39279cc3 | 4160 | /* now the directory is empty */ |
2b0143b5 | 4161 | err = btrfs_unlink_inode(trans, root, dir, d_inode(dentry), |
e02119d5 | 4162 | dentry->d_name.name, dentry->d_name.len); |
d397712b | 4163 | if (!err) |
dbe674a9 | 4164 | btrfs_i_size_write(inode, 0); |
4df27c4d | 4165 | out: |
d52be818 | 4166 | btrfs_end_transaction(trans, root); |
b53d3f5d | 4167 | btrfs_btree_balance_dirty(root); |
3954401f | 4168 | |
39279cc3 CM |
4169 | return err; |
4170 | } | |
4171 | ||
28f75a0e CM |
4172 | static int truncate_space_check(struct btrfs_trans_handle *trans, |
4173 | struct btrfs_root *root, | |
4174 | u64 bytes_deleted) | |
4175 | { | |
4176 | int ret; | |
4177 | ||
4178 | bytes_deleted = btrfs_csum_bytes_to_leaves(root, bytes_deleted); | |
4179 | ret = btrfs_block_rsv_add(root, &root->fs_info->trans_block_rsv, | |
4180 | bytes_deleted, BTRFS_RESERVE_NO_FLUSH); | |
4181 | if (!ret) | |
4182 | trans->bytes_reserved += bytes_deleted; | |
4183 | return ret; | |
4184 | ||
4185 | } | |
4186 | ||
39279cc3 CM |
4187 | /* |
4188 | * this can truncate away extent items, csum items and directory items. | |
4189 | * It starts at a high offset and removes keys until it can't find | |
d352ac68 | 4190 | * any higher than new_size |
39279cc3 CM |
4191 | * |
4192 | * csum items that cross the new i_size are truncated to the new size | |
4193 | * as well. | |
7b128766 JB |
4194 | * |
4195 | * min_type is the minimum key type to truncate down to. If set to 0, this | |
4196 | * will kill all the items on this inode, including the INODE_ITEM_KEY. | |
39279cc3 | 4197 | */ |
8082510e YZ |
4198 | int btrfs_truncate_inode_items(struct btrfs_trans_handle *trans, |
4199 | struct btrfs_root *root, | |
4200 | struct inode *inode, | |
4201 | u64 new_size, u32 min_type) | |
39279cc3 | 4202 | { |
39279cc3 | 4203 | struct btrfs_path *path; |
5f39d397 | 4204 | struct extent_buffer *leaf; |
39279cc3 | 4205 | struct btrfs_file_extent_item *fi; |
8082510e YZ |
4206 | struct btrfs_key key; |
4207 | struct btrfs_key found_key; | |
39279cc3 | 4208 | u64 extent_start = 0; |
db94535d | 4209 | u64 extent_num_bytes = 0; |
5d4f98a2 | 4210 | u64 extent_offset = 0; |
39279cc3 | 4211 | u64 item_end = 0; |
7f4f6e0a | 4212 | u64 last_size = (u64)-1; |
8082510e | 4213 | u32 found_type = (u8)-1; |
39279cc3 CM |
4214 | int found_extent; |
4215 | int del_item; | |
85e21bac CM |
4216 | int pending_del_nr = 0; |
4217 | int pending_del_slot = 0; | |
179e29e4 | 4218 | int extent_type = -1; |
8082510e YZ |
4219 | int ret; |
4220 | int err = 0; | |
33345d01 | 4221 | u64 ino = btrfs_ino(inode); |
28ed1345 | 4222 | u64 bytes_deleted = 0; |
1262133b JB |
4223 | bool be_nice = 0; |
4224 | bool should_throttle = 0; | |
28f75a0e | 4225 | bool should_end = 0; |
8082510e YZ |
4226 | |
4227 | BUG_ON(new_size > 0 && min_type != BTRFS_EXTENT_DATA_KEY); | |
39279cc3 | 4228 | |
28ed1345 CM |
4229 | /* |
4230 | * for non-free space inodes and ref cows, we want to back off from | |
4231 | * time to time | |
4232 | */ | |
4233 | if (!btrfs_is_free_space_inode(inode) && | |
4234 | test_bit(BTRFS_ROOT_REF_COWS, &root->state)) | |
4235 | be_nice = 1; | |
4236 | ||
0eb0e19c MF |
4237 | path = btrfs_alloc_path(); |
4238 | if (!path) | |
4239 | return -ENOMEM; | |
4240 | path->reada = -1; | |
4241 | ||
5dc562c5 JB |
4242 | /* |
4243 | * We want to drop from the next block forward in case this new size is | |
4244 | * not block aligned since we will be keeping the last block of the | |
4245 | * extent just the way it is. | |
4246 | */ | |
27cdeb70 MX |
4247 | if (test_bit(BTRFS_ROOT_REF_COWS, &root->state) || |
4248 | root == root->fs_info->tree_root) | |
fda2832f QW |
4249 | btrfs_drop_extent_cache(inode, ALIGN(new_size, |
4250 | root->sectorsize), (u64)-1, 0); | |
8082510e | 4251 | |
16cdcec7 MX |
4252 | /* |
4253 | * This function is also used to drop the items in the log tree before | |
4254 | * we relog the inode, so if root != BTRFS_I(inode)->root, it means | |
4255 | * it is used to drop the loged items. So we shouldn't kill the delayed | |
4256 | * items. | |
4257 | */ | |
4258 | if (min_type == 0 && root == BTRFS_I(inode)->root) | |
4259 | btrfs_kill_delayed_inode_items(inode); | |
4260 | ||
33345d01 | 4261 | key.objectid = ino; |
39279cc3 | 4262 | key.offset = (u64)-1; |
5f39d397 CM |
4263 | key.type = (u8)-1; |
4264 | ||
85e21bac | 4265 | search_again: |
28ed1345 CM |
4266 | /* |
4267 | * with a 16K leaf size and 128MB extents, you can actually queue | |
4268 | * up a huge file in a single leaf. Most of the time that | |
4269 | * bytes_deleted is > 0, it will be huge by the time we get here | |
4270 | */ | |
4271 | if (be_nice && bytes_deleted > 32 * 1024 * 1024) { | |
4272 | if (btrfs_should_end_transaction(trans, root)) { | |
4273 | err = -EAGAIN; | |
4274 | goto error; | |
4275 | } | |
4276 | } | |
4277 | ||
4278 | ||
b9473439 | 4279 | path->leave_spinning = 1; |
85e21bac | 4280 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); |
8082510e YZ |
4281 | if (ret < 0) { |
4282 | err = ret; | |
4283 | goto out; | |
4284 | } | |
d397712b | 4285 | |
85e21bac | 4286 | if (ret > 0) { |
e02119d5 CM |
4287 | /* there are no items in the tree for us to truncate, we're |
4288 | * done | |
4289 | */ | |
8082510e YZ |
4290 | if (path->slots[0] == 0) |
4291 | goto out; | |
85e21bac CM |
4292 | path->slots[0]--; |
4293 | } | |
4294 | ||
d397712b | 4295 | while (1) { |
39279cc3 | 4296 | fi = NULL; |
5f39d397 CM |
4297 | leaf = path->nodes[0]; |
4298 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); | |
962a298f | 4299 | found_type = found_key.type; |
39279cc3 | 4300 | |
33345d01 | 4301 | if (found_key.objectid != ino) |
39279cc3 | 4302 | break; |
5f39d397 | 4303 | |
85e21bac | 4304 | if (found_type < min_type) |
39279cc3 CM |
4305 | break; |
4306 | ||
5f39d397 | 4307 | item_end = found_key.offset; |
39279cc3 | 4308 | if (found_type == BTRFS_EXTENT_DATA_KEY) { |
5f39d397 | 4309 | fi = btrfs_item_ptr(leaf, path->slots[0], |
39279cc3 | 4310 | struct btrfs_file_extent_item); |
179e29e4 CM |
4311 | extent_type = btrfs_file_extent_type(leaf, fi); |
4312 | if (extent_type != BTRFS_FILE_EXTENT_INLINE) { | |
5f39d397 | 4313 | item_end += |
db94535d | 4314 | btrfs_file_extent_num_bytes(leaf, fi); |
179e29e4 | 4315 | } else if (extent_type == BTRFS_FILE_EXTENT_INLINE) { |
179e29e4 | 4316 | item_end += btrfs_file_extent_inline_len(leaf, |
514ac8ad | 4317 | path->slots[0], fi); |
39279cc3 | 4318 | } |
008630c1 | 4319 | item_end--; |
39279cc3 | 4320 | } |
8082510e YZ |
4321 | if (found_type > min_type) { |
4322 | del_item = 1; | |
4323 | } else { | |
4324 | if (item_end < new_size) | |
b888db2b | 4325 | break; |
8082510e YZ |
4326 | if (found_key.offset >= new_size) |
4327 | del_item = 1; | |
4328 | else | |
4329 | del_item = 0; | |
39279cc3 | 4330 | } |
39279cc3 | 4331 | found_extent = 0; |
39279cc3 | 4332 | /* FIXME, shrink the extent if the ref count is only 1 */ |
179e29e4 CM |
4333 | if (found_type != BTRFS_EXTENT_DATA_KEY) |
4334 | goto delete; | |
4335 | ||
7f4f6e0a JB |
4336 | if (del_item) |
4337 | last_size = found_key.offset; | |
4338 | else | |
4339 | last_size = new_size; | |
4340 | ||
179e29e4 | 4341 | if (extent_type != BTRFS_FILE_EXTENT_INLINE) { |
39279cc3 | 4342 | u64 num_dec; |
db94535d | 4343 | extent_start = btrfs_file_extent_disk_bytenr(leaf, fi); |
f70a9a6b | 4344 | if (!del_item) { |
db94535d CM |
4345 | u64 orig_num_bytes = |
4346 | btrfs_file_extent_num_bytes(leaf, fi); | |
fda2832f QW |
4347 | extent_num_bytes = ALIGN(new_size - |
4348 | found_key.offset, | |
4349 | root->sectorsize); | |
db94535d CM |
4350 | btrfs_set_file_extent_num_bytes(leaf, fi, |
4351 | extent_num_bytes); | |
4352 | num_dec = (orig_num_bytes - | |
9069218d | 4353 | extent_num_bytes); |
27cdeb70 MX |
4354 | if (test_bit(BTRFS_ROOT_REF_COWS, |
4355 | &root->state) && | |
4356 | extent_start != 0) | |
a76a3cd4 | 4357 | inode_sub_bytes(inode, num_dec); |
5f39d397 | 4358 | btrfs_mark_buffer_dirty(leaf); |
39279cc3 | 4359 | } else { |
db94535d CM |
4360 | extent_num_bytes = |
4361 | btrfs_file_extent_disk_num_bytes(leaf, | |
4362 | fi); | |
5d4f98a2 YZ |
4363 | extent_offset = found_key.offset - |
4364 | btrfs_file_extent_offset(leaf, fi); | |
4365 | ||
39279cc3 | 4366 | /* FIXME blocksize != 4096 */ |
9069218d | 4367 | num_dec = btrfs_file_extent_num_bytes(leaf, fi); |
39279cc3 CM |
4368 | if (extent_start != 0) { |
4369 | found_extent = 1; | |
27cdeb70 MX |
4370 | if (test_bit(BTRFS_ROOT_REF_COWS, |
4371 | &root->state)) | |
a76a3cd4 | 4372 | inode_sub_bytes(inode, num_dec); |
e02119d5 | 4373 | } |
39279cc3 | 4374 | } |
9069218d | 4375 | } else if (extent_type == BTRFS_FILE_EXTENT_INLINE) { |
c8b97818 CM |
4376 | /* |
4377 | * we can't truncate inline items that have had | |
4378 | * special encodings | |
4379 | */ | |
4380 | if (!del_item && | |
4381 | btrfs_file_extent_compression(leaf, fi) == 0 && | |
4382 | btrfs_file_extent_encryption(leaf, fi) == 0 && | |
4383 | btrfs_file_extent_other_encoding(leaf, fi) == 0) { | |
e02119d5 CM |
4384 | u32 size = new_size - found_key.offset; |
4385 | ||
27cdeb70 | 4386 | if (test_bit(BTRFS_ROOT_REF_COWS, &root->state)) |
a76a3cd4 YZ |
4387 | inode_sub_bytes(inode, item_end + 1 - |
4388 | new_size); | |
514ac8ad CM |
4389 | |
4390 | /* | |
4391 | * update the ram bytes to properly reflect | |
4392 | * the new size of our item | |
4393 | */ | |
4394 | btrfs_set_file_extent_ram_bytes(leaf, fi, size); | |
e02119d5 CM |
4395 | size = |
4396 | btrfs_file_extent_calc_inline_size(size); | |
afe5fea7 | 4397 | btrfs_truncate_item(root, path, size, 1); |
27cdeb70 MX |
4398 | } else if (test_bit(BTRFS_ROOT_REF_COWS, |
4399 | &root->state)) { | |
a76a3cd4 YZ |
4400 | inode_sub_bytes(inode, item_end + 1 - |
4401 | found_key.offset); | |
9069218d | 4402 | } |
39279cc3 | 4403 | } |
179e29e4 | 4404 | delete: |
39279cc3 | 4405 | if (del_item) { |
85e21bac CM |
4406 | if (!pending_del_nr) { |
4407 | /* no pending yet, add ourselves */ | |
4408 | pending_del_slot = path->slots[0]; | |
4409 | pending_del_nr = 1; | |
4410 | } else if (pending_del_nr && | |
4411 | path->slots[0] + 1 == pending_del_slot) { | |
4412 | /* hop on the pending chunk */ | |
4413 | pending_del_nr++; | |
4414 | pending_del_slot = path->slots[0]; | |
4415 | } else { | |
d397712b | 4416 | BUG(); |
85e21bac | 4417 | } |
39279cc3 CM |
4418 | } else { |
4419 | break; | |
4420 | } | |
28f75a0e CM |
4421 | should_throttle = 0; |
4422 | ||
27cdeb70 MX |
4423 | if (found_extent && |
4424 | (test_bit(BTRFS_ROOT_REF_COWS, &root->state) || | |
4425 | root == root->fs_info->tree_root)) { | |
b9473439 | 4426 | btrfs_set_path_blocking(path); |
28ed1345 | 4427 | bytes_deleted += extent_num_bytes; |
39279cc3 | 4428 | ret = btrfs_free_extent(trans, root, extent_start, |
5d4f98a2 YZ |
4429 | extent_num_bytes, 0, |
4430 | btrfs_header_owner(leaf), | |
66d7e7f0 | 4431 | ino, extent_offset, 0); |
39279cc3 | 4432 | BUG_ON(ret); |
1262133b | 4433 | if (btrfs_should_throttle_delayed_refs(trans, root)) |
28ed1345 CM |
4434 | btrfs_async_run_delayed_refs(root, |
4435 | trans->delayed_ref_updates * 2, 0); | |
28f75a0e CM |
4436 | if (be_nice) { |
4437 | if (truncate_space_check(trans, root, | |
4438 | extent_num_bytes)) { | |
4439 | should_end = 1; | |
4440 | } | |
4441 | if (btrfs_should_throttle_delayed_refs(trans, | |
4442 | root)) { | |
4443 | should_throttle = 1; | |
4444 | } | |
4445 | } | |
39279cc3 | 4446 | } |
85e21bac | 4447 | |
8082510e YZ |
4448 | if (found_type == BTRFS_INODE_ITEM_KEY) |
4449 | break; | |
4450 | ||
4451 | if (path->slots[0] == 0 || | |
1262133b | 4452 | path->slots[0] != pending_del_slot || |
28f75a0e | 4453 | should_throttle || should_end) { |
8082510e YZ |
4454 | if (pending_del_nr) { |
4455 | ret = btrfs_del_items(trans, root, path, | |
4456 | pending_del_slot, | |
4457 | pending_del_nr); | |
79787eaa JM |
4458 | if (ret) { |
4459 | btrfs_abort_transaction(trans, | |
4460 | root, ret); | |
4461 | goto error; | |
4462 | } | |
8082510e YZ |
4463 | pending_del_nr = 0; |
4464 | } | |
b3b4aa74 | 4465 | btrfs_release_path(path); |
28f75a0e | 4466 | if (should_throttle) { |
1262133b JB |
4467 | unsigned long updates = trans->delayed_ref_updates; |
4468 | if (updates) { | |
4469 | trans->delayed_ref_updates = 0; | |
4470 | ret = btrfs_run_delayed_refs(trans, root, updates * 2); | |
4471 | if (ret && !err) | |
4472 | err = ret; | |
4473 | } | |
4474 | } | |
28f75a0e CM |
4475 | /* |
4476 | * if we failed to refill our space rsv, bail out | |
4477 | * and let the transaction restart | |
4478 | */ | |
4479 | if (should_end) { | |
4480 | err = -EAGAIN; | |
4481 | goto error; | |
4482 | } | |
85e21bac | 4483 | goto search_again; |
8082510e YZ |
4484 | } else { |
4485 | path->slots[0]--; | |
85e21bac | 4486 | } |
39279cc3 | 4487 | } |
8082510e | 4488 | out: |
85e21bac CM |
4489 | if (pending_del_nr) { |
4490 | ret = btrfs_del_items(trans, root, path, pending_del_slot, | |
4491 | pending_del_nr); | |
79787eaa JM |
4492 | if (ret) |
4493 | btrfs_abort_transaction(trans, root, ret); | |
85e21bac | 4494 | } |
79787eaa | 4495 | error: |
dac5705c FM |
4496 | if (last_size != (u64)-1 && |
4497 | root->root_key.objectid != BTRFS_TREE_LOG_OBJECTID) | |
7f4f6e0a | 4498 | btrfs_ordered_update_i_size(inode, last_size, NULL); |
28ed1345 | 4499 | |
39279cc3 | 4500 | btrfs_free_path(path); |
28ed1345 | 4501 | |
28f75a0e | 4502 | if (be_nice && bytes_deleted > 32 * 1024 * 1024) { |
28ed1345 CM |
4503 | unsigned long updates = trans->delayed_ref_updates; |
4504 | if (updates) { | |
4505 | trans->delayed_ref_updates = 0; | |
4506 | ret = btrfs_run_delayed_refs(trans, root, updates * 2); | |
4507 | if (ret && !err) | |
4508 | err = ret; | |
4509 | } | |
4510 | } | |
8082510e | 4511 | return err; |
39279cc3 CM |
4512 | } |
4513 | ||
4514 | /* | |
2aaa6655 JB |
4515 | * btrfs_truncate_page - read, zero a chunk and write a page |
4516 | * @inode - inode that we're zeroing | |
4517 | * @from - the offset to start zeroing | |
4518 | * @len - the length to zero, 0 to zero the entire range respective to the | |
4519 | * offset | |
4520 | * @front - zero up to the offset instead of from the offset on | |
4521 | * | |
4522 | * This will find the page for the "from" offset and cow the page and zero the | |
4523 | * part we want to zero. This is used with truncate and hole punching. | |
39279cc3 | 4524 | */ |
2aaa6655 JB |
4525 | int btrfs_truncate_page(struct inode *inode, loff_t from, loff_t len, |
4526 | int front) | |
39279cc3 | 4527 | { |
2aaa6655 | 4528 | struct address_space *mapping = inode->i_mapping; |
db94535d | 4529 | struct btrfs_root *root = BTRFS_I(inode)->root; |
e6dcd2dc CM |
4530 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; |
4531 | struct btrfs_ordered_extent *ordered; | |
2ac55d41 | 4532 | struct extent_state *cached_state = NULL; |
e6dcd2dc | 4533 | char *kaddr; |
db94535d | 4534 | u32 blocksize = root->sectorsize; |
39279cc3 CM |
4535 | pgoff_t index = from >> PAGE_CACHE_SHIFT; |
4536 | unsigned offset = from & (PAGE_CACHE_SIZE-1); | |
4537 | struct page *page; | |
3b16a4e3 | 4538 | gfp_t mask = btrfs_alloc_write_mask(mapping); |
39279cc3 | 4539 | int ret = 0; |
a52d9a80 | 4540 | u64 page_start; |
e6dcd2dc | 4541 | u64 page_end; |
39279cc3 | 4542 | |
2aaa6655 JB |
4543 | if ((offset & (blocksize - 1)) == 0 && |
4544 | (!len || ((len & (blocksize - 1)) == 0))) | |
39279cc3 | 4545 | goto out; |
0ca1f7ce | 4546 | ret = btrfs_delalloc_reserve_space(inode, PAGE_CACHE_SIZE); |
5d5e103a JB |
4547 | if (ret) |
4548 | goto out; | |
39279cc3 | 4549 | |
211c17f5 | 4550 | again: |
3b16a4e3 | 4551 | page = find_or_create_page(mapping, index, mask); |
5d5e103a | 4552 | if (!page) { |
0ca1f7ce | 4553 | btrfs_delalloc_release_space(inode, PAGE_CACHE_SIZE); |
ac6a2b36 | 4554 | ret = -ENOMEM; |
39279cc3 | 4555 | goto out; |
5d5e103a | 4556 | } |
e6dcd2dc CM |
4557 | |
4558 | page_start = page_offset(page); | |
4559 | page_end = page_start + PAGE_CACHE_SIZE - 1; | |
4560 | ||
39279cc3 | 4561 | if (!PageUptodate(page)) { |
9ebefb18 | 4562 | ret = btrfs_readpage(NULL, page); |
39279cc3 | 4563 | lock_page(page); |
211c17f5 CM |
4564 | if (page->mapping != mapping) { |
4565 | unlock_page(page); | |
4566 | page_cache_release(page); | |
4567 | goto again; | |
4568 | } | |
39279cc3 CM |
4569 | if (!PageUptodate(page)) { |
4570 | ret = -EIO; | |
89642229 | 4571 | goto out_unlock; |
39279cc3 CM |
4572 | } |
4573 | } | |
211c17f5 | 4574 | wait_on_page_writeback(page); |
e6dcd2dc | 4575 | |
d0082371 | 4576 | lock_extent_bits(io_tree, page_start, page_end, 0, &cached_state); |
e6dcd2dc CM |
4577 | set_page_extent_mapped(page); |
4578 | ||
4579 | ordered = btrfs_lookup_ordered_extent(inode, page_start); | |
4580 | if (ordered) { | |
2ac55d41 JB |
4581 | unlock_extent_cached(io_tree, page_start, page_end, |
4582 | &cached_state, GFP_NOFS); | |
e6dcd2dc CM |
4583 | unlock_page(page); |
4584 | page_cache_release(page); | |
eb84ae03 | 4585 | btrfs_start_ordered_extent(inode, ordered, 1); |
e6dcd2dc CM |
4586 | btrfs_put_ordered_extent(ordered); |
4587 | goto again; | |
4588 | } | |
4589 | ||
2ac55d41 | 4590 | clear_extent_bit(&BTRFS_I(inode)->io_tree, page_start, page_end, |
9e8a4a8b LB |
4591 | EXTENT_DIRTY | EXTENT_DELALLOC | |
4592 | EXTENT_DO_ACCOUNTING | EXTENT_DEFRAG, | |
2ac55d41 | 4593 | 0, 0, &cached_state, GFP_NOFS); |
5d5e103a | 4594 | |
2ac55d41 JB |
4595 | ret = btrfs_set_extent_delalloc(inode, page_start, page_end, |
4596 | &cached_state); | |
9ed74f2d | 4597 | if (ret) { |
2ac55d41 JB |
4598 | unlock_extent_cached(io_tree, page_start, page_end, |
4599 | &cached_state, GFP_NOFS); | |
9ed74f2d JB |
4600 | goto out_unlock; |
4601 | } | |
4602 | ||
e6dcd2dc | 4603 | if (offset != PAGE_CACHE_SIZE) { |
2aaa6655 JB |
4604 | if (!len) |
4605 | len = PAGE_CACHE_SIZE - offset; | |
e6dcd2dc | 4606 | kaddr = kmap(page); |
2aaa6655 JB |
4607 | if (front) |
4608 | memset(kaddr, 0, offset); | |
4609 | else | |
4610 | memset(kaddr + offset, 0, len); | |
e6dcd2dc CM |
4611 | flush_dcache_page(page); |
4612 | kunmap(page); | |
4613 | } | |
247e743c | 4614 | ClearPageChecked(page); |
e6dcd2dc | 4615 | set_page_dirty(page); |
2ac55d41 JB |
4616 | unlock_extent_cached(io_tree, page_start, page_end, &cached_state, |
4617 | GFP_NOFS); | |
39279cc3 | 4618 | |
89642229 | 4619 | out_unlock: |
5d5e103a | 4620 | if (ret) |
0ca1f7ce | 4621 | btrfs_delalloc_release_space(inode, PAGE_CACHE_SIZE); |
39279cc3 CM |
4622 | unlock_page(page); |
4623 | page_cache_release(page); | |
4624 | out: | |
4625 | return ret; | |
4626 | } | |
4627 | ||
16e7549f JB |
4628 | static int maybe_insert_hole(struct btrfs_root *root, struct inode *inode, |
4629 | u64 offset, u64 len) | |
4630 | { | |
4631 | struct btrfs_trans_handle *trans; | |
4632 | int ret; | |
4633 | ||
4634 | /* | |
4635 | * Still need to make sure the inode looks like it's been updated so | |
4636 | * that any holes get logged if we fsync. | |
4637 | */ | |
4638 | if (btrfs_fs_incompat(root->fs_info, NO_HOLES)) { | |
4639 | BTRFS_I(inode)->last_trans = root->fs_info->generation; | |
4640 | BTRFS_I(inode)->last_sub_trans = root->log_transid; | |
4641 | BTRFS_I(inode)->last_log_commit = root->last_log_commit; | |
4642 | return 0; | |
4643 | } | |
4644 | ||
4645 | /* | |
4646 | * 1 - for the one we're dropping | |
4647 | * 1 - for the one we're adding | |
4648 | * 1 - for updating the inode. | |
4649 | */ | |
4650 | trans = btrfs_start_transaction(root, 3); | |
4651 | if (IS_ERR(trans)) | |
4652 | return PTR_ERR(trans); | |
4653 | ||
4654 | ret = btrfs_drop_extents(trans, root, inode, offset, offset + len, 1); | |
4655 | if (ret) { | |
4656 | btrfs_abort_transaction(trans, root, ret); | |
4657 | btrfs_end_transaction(trans, root); | |
4658 | return ret; | |
4659 | } | |
4660 | ||
4661 | ret = btrfs_insert_file_extent(trans, root, btrfs_ino(inode), offset, | |
4662 | 0, 0, len, 0, len, 0, 0, 0); | |
4663 | if (ret) | |
4664 | btrfs_abort_transaction(trans, root, ret); | |
4665 | else | |
4666 | btrfs_update_inode(trans, root, inode); | |
4667 | btrfs_end_transaction(trans, root); | |
4668 | return ret; | |
4669 | } | |
4670 | ||
695a0d0d JB |
4671 | /* |
4672 | * This function puts in dummy file extents for the area we're creating a hole | |
4673 | * for. So if we are truncating this file to a larger size we need to insert | |
4674 | * these file extents so that btrfs_get_extent will return a EXTENT_MAP_HOLE for | |
4675 | * the range between oldsize and size | |
4676 | */ | |
a41ad394 | 4677 | int btrfs_cont_expand(struct inode *inode, loff_t oldsize, loff_t size) |
39279cc3 | 4678 | { |
9036c102 YZ |
4679 | struct btrfs_root *root = BTRFS_I(inode)->root; |
4680 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; | |
a22285a6 | 4681 | struct extent_map *em = NULL; |
2ac55d41 | 4682 | struct extent_state *cached_state = NULL; |
5dc562c5 | 4683 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; |
fda2832f QW |
4684 | u64 hole_start = ALIGN(oldsize, root->sectorsize); |
4685 | u64 block_end = ALIGN(size, root->sectorsize); | |
9036c102 YZ |
4686 | u64 last_byte; |
4687 | u64 cur_offset; | |
4688 | u64 hole_size; | |
9ed74f2d | 4689 | int err = 0; |
39279cc3 | 4690 | |
a71754fc JB |
4691 | /* |
4692 | * If our size started in the middle of a page we need to zero out the | |
4693 | * rest of the page before we expand the i_size, otherwise we could | |
4694 | * expose stale data. | |
4695 | */ | |
4696 | err = btrfs_truncate_page(inode, oldsize, 0, 0); | |
4697 | if (err) | |
4698 | return err; | |
4699 | ||
9036c102 YZ |
4700 | if (size <= hole_start) |
4701 | return 0; | |
4702 | ||
9036c102 YZ |
4703 | while (1) { |
4704 | struct btrfs_ordered_extent *ordered; | |
fa7c1494 | 4705 | |
2ac55d41 | 4706 | lock_extent_bits(io_tree, hole_start, block_end - 1, 0, |
d0082371 | 4707 | &cached_state); |
fa7c1494 MX |
4708 | ordered = btrfs_lookup_ordered_range(inode, hole_start, |
4709 | block_end - hole_start); | |
9036c102 YZ |
4710 | if (!ordered) |
4711 | break; | |
2ac55d41 JB |
4712 | unlock_extent_cached(io_tree, hole_start, block_end - 1, |
4713 | &cached_state, GFP_NOFS); | |
fa7c1494 | 4714 | btrfs_start_ordered_extent(inode, ordered, 1); |
9036c102 YZ |
4715 | btrfs_put_ordered_extent(ordered); |
4716 | } | |
39279cc3 | 4717 | |
9036c102 YZ |
4718 | cur_offset = hole_start; |
4719 | while (1) { | |
4720 | em = btrfs_get_extent(inode, NULL, 0, cur_offset, | |
4721 | block_end - cur_offset, 0); | |
79787eaa JM |
4722 | if (IS_ERR(em)) { |
4723 | err = PTR_ERR(em); | |
f2767956 | 4724 | em = NULL; |
79787eaa JM |
4725 | break; |
4726 | } | |
9036c102 | 4727 | last_byte = min(extent_map_end(em), block_end); |
fda2832f | 4728 | last_byte = ALIGN(last_byte , root->sectorsize); |
8082510e | 4729 | if (!test_bit(EXTENT_FLAG_PREALLOC, &em->flags)) { |
5dc562c5 | 4730 | struct extent_map *hole_em; |
9036c102 | 4731 | hole_size = last_byte - cur_offset; |
9ed74f2d | 4732 | |
16e7549f JB |
4733 | err = maybe_insert_hole(root, inode, cur_offset, |
4734 | hole_size); | |
4735 | if (err) | |
3893e33b | 4736 | break; |
5dc562c5 JB |
4737 | btrfs_drop_extent_cache(inode, cur_offset, |
4738 | cur_offset + hole_size - 1, 0); | |
4739 | hole_em = alloc_extent_map(); | |
4740 | if (!hole_em) { | |
4741 | set_bit(BTRFS_INODE_NEEDS_FULL_SYNC, | |
4742 | &BTRFS_I(inode)->runtime_flags); | |
4743 | goto next; | |
4744 | } | |
4745 | hole_em->start = cur_offset; | |
4746 | hole_em->len = hole_size; | |
4747 | hole_em->orig_start = cur_offset; | |
8082510e | 4748 | |
5dc562c5 JB |
4749 | hole_em->block_start = EXTENT_MAP_HOLE; |
4750 | hole_em->block_len = 0; | |
b4939680 | 4751 | hole_em->orig_block_len = 0; |
cc95bef6 | 4752 | hole_em->ram_bytes = hole_size; |
5dc562c5 JB |
4753 | hole_em->bdev = root->fs_info->fs_devices->latest_bdev; |
4754 | hole_em->compress_type = BTRFS_COMPRESS_NONE; | |
16e7549f | 4755 | hole_em->generation = root->fs_info->generation; |
8082510e | 4756 | |
5dc562c5 JB |
4757 | while (1) { |
4758 | write_lock(&em_tree->lock); | |
09a2a8f9 | 4759 | err = add_extent_mapping(em_tree, hole_em, 1); |
5dc562c5 JB |
4760 | write_unlock(&em_tree->lock); |
4761 | if (err != -EEXIST) | |
4762 | break; | |
4763 | btrfs_drop_extent_cache(inode, cur_offset, | |
4764 | cur_offset + | |
4765 | hole_size - 1, 0); | |
4766 | } | |
4767 | free_extent_map(hole_em); | |
9036c102 | 4768 | } |
16e7549f | 4769 | next: |
9036c102 | 4770 | free_extent_map(em); |
a22285a6 | 4771 | em = NULL; |
9036c102 | 4772 | cur_offset = last_byte; |
8082510e | 4773 | if (cur_offset >= block_end) |
9036c102 YZ |
4774 | break; |
4775 | } | |
a22285a6 | 4776 | free_extent_map(em); |
2ac55d41 JB |
4777 | unlock_extent_cached(io_tree, hole_start, block_end - 1, &cached_state, |
4778 | GFP_NOFS); | |
9036c102 YZ |
4779 | return err; |
4780 | } | |
39279cc3 | 4781 | |
9ea24bbe FM |
4782 | static int wait_snapshoting_atomic_t(atomic_t *a) |
4783 | { | |
4784 | schedule(); | |
4785 | return 0; | |
4786 | } | |
4787 | ||
4788 | static void wait_for_snapshot_creation(struct btrfs_root *root) | |
4789 | { | |
4790 | while (true) { | |
4791 | int ret; | |
4792 | ||
4793 | ret = btrfs_start_write_no_snapshoting(root); | |
4794 | if (ret) | |
4795 | break; | |
4796 | wait_on_atomic_t(&root->will_be_snapshoted, | |
4797 | wait_snapshoting_atomic_t, | |
4798 | TASK_UNINTERRUPTIBLE); | |
4799 | } | |
4800 | } | |
4801 | ||
3972f260 | 4802 | static int btrfs_setsize(struct inode *inode, struct iattr *attr) |
8082510e | 4803 | { |
f4a2f4c5 MX |
4804 | struct btrfs_root *root = BTRFS_I(inode)->root; |
4805 | struct btrfs_trans_handle *trans; | |
a41ad394 | 4806 | loff_t oldsize = i_size_read(inode); |
3972f260 ES |
4807 | loff_t newsize = attr->ia_size; |
4808 | int mask = attr->ia_valid; | |
8082510e YZ |
4809 | int ret; |
4810 | ||
3972f260 ES |
4811 | /* |
4812 | * The regular truncate() case without ATTR_CTIME and ATTR_MTIME is a | |
4813 | * special case where we need to update the times despite not having | |
4814 | * these flags set. For all other operations the VFS set these flags | |
4815 | * explicitly if it wants a timestamp update. | |
4816 | */ | |
dff6efc3 CH |
4817 | if (newsize != oldsize) { |
4818 | inode_inc_iversion(inode); | |
4819 | if (!(mask & (ATTR_CTIME | ATTR_MTIME))) | |
4820 | inode->i_ctime = inode->i_mtime = | |
4821 | current_fs_time(inode->i_sb); | |
4822 | } | |
3972f260 | 4823 | |
a41ad394 | 4824 | if (newsize > oldsize) { |
7caef267 | 4825 | truncate_pagecache(inode, newsize); |
9ea24bbe FM |
4826 | /* |
4827 | * Don't do an expanding truncate while snapshoting is ongoing. | |
4828 | * This is to ensure the snapshot captures a fully consistent | |
4829 | * state of this file - if the snapshot captures this expanding | |
4830 | * truncation, it must capture all writes that happened before | |
4831 | * this truncation. | |
4832 | */ | |
4833 | wait_for_snapshot_creation(root); | |
a41ad394 | 4834 | ret = btrfs_cont_expand(inode, oldsize, newsize); |
9ea24bbe FM |
4835 | if (ret) { |
4836 | btrfs_end_write_no_snapshoting(root); | |
8082510e | 4837 | return ret; |
9ea24bbe | 4838 | } |
8082510e | 4839 | |
f4a2f4c5 | 4840 | trans = btrfs_start_transaction(root, 1); |
9ea24bbe FM |
4841 | if (IS_ERR(trans)) { |
4842 | btrfs_end_write_no_snapshoting(root); | |
f4a2f4c5 | 4843 | return PTR_ERR(trans); |
9ea24bbe | 4844 | } |
f4a2f4c5 MX |
4845 | |
4846 | i_size_write(inode, newsize); | |
4847 | btrfs_ordered_update_i_size(inode, i_size_read(inode), NULL); | |
4848 | ret = btrfs_update_inode(trans, root, inode); | |
9ea24bbe | 4849 | btrfs_end_write_no_snapshoting(root); |
7ad85bb7 | 4850 | btrfs_end_transaction(trans, root); |
a41ad394 | 4851 | } else { |
8082510e | 4852 | |
a41ad394 JB |
4853 | /* |
4854 | * We're truncating a file that used to have good data down to | |
4855 | * zero. Make sure it gets into the ordered flush list so that | |
4856 | * any new writes get down to disk quickly. | |
4857 | */ | |
4858 | if (newsize == 0) | |
72ac3c0d JB |
4859 | set_bit(BTRFS_INODE_ORDERED_DATA_CLOSE, |
4860 | &BTRFS_I(inode)->runtime_flags); | |
8082510e | 4861 | |
f3fe820c JB |
4862 | /* |
4863 | * 1 for the orphan item we're going to add | |
4864 | * 1 for the orphan item deletion. | |
4865 | */ | |
4866 | trans = btrfs_start_transaction(root, 2); | |
4867 | if (IS_ERR(trans)) | |
4868 | return PTR_ERR(trans); | |
4869 | ||
4870 | /* | |
4871 | * We need to do this in case we fail at _any_ point during the | |
4872 | * actual truncate. Once we do the truncate_setsize we could | |
4873 | * invalidate pages which forces any outstanding ordered io to | |
4874 | * be instantly completed which will give us extents that need | |
4875 | * to be truncated. If we fail to get an orphan inode down we | |
4876 | * could have left over extents that were never meant to live, | |
4877 | * so we need to garuntee from this point on that everything | |
4878 | * will be consistent. | |
4879 | */ | |
4880 | ret = btrfs_orphan_add(trans, inode); | |
4881 | btrfs_end_transaction(trans, root); | |
4882 | if (ret) | |
4883 | return ret; | |
4884 | ||
a41ad394 JB |
4885 | /* we don't support swapfiles, so vmtruncate shouldn't fail */ |
4886 | truncate_setsize(inode, newsize); | |
2e60a51e MX |
4887 | |
4888 | /* Disable nonlocked read DIO to avoid the end less truncate */ | |
4889 | btrfs_inode_block_unlocked_dio(inode); | |
4890 | inode_dio_wait(inode); | |
4891 | btrfs_inode_resume_unlocked_dio(inode); | |
4892 | ||
a41ad394 | 4893 | ret = btrfs_truncate(inode); |
7f4f6e0a JB |
4894 | if (ret && inode->i_nlink) { |
4895 | int err; | |
4896 | ||
4897 | /* | |
4898 | * failed to truncate, disk_i_size is only adjusted down | |
4899 | * as we remove extents, so it should represent the true | |
4900 | * size of the inode, so reset the in memory size and | |
4901 | * delete our orphan entry. | |
4902 | */ | |
4903 | trans = btrfs_join_transaction(root); | |
4904 | if (IS_ERR(trans)) { | |
4905 | btrfs_orphan_del(NULL, inode); | |
4906 | return ret; | |
4907 | } | |
4908 | i_size_write(inode, BTRFS_I(inode)->disk_i_size); | |
4909 | err = btrfs_orphan_del(trans, inode); | |
4910 | if (err) | |
4911 | btrfs_abort_transaction(trans, root, err); | |
4912 | btrfs_end_transaction(trans, root); | |
4913 | } | |
8082510e YZ |
4914 | } |
4915 | ||
a41ad394 | 4916 | return ret; |
8082510e YZ |
4917 | } |
4918 | ||
9036c102 YZ |
4919 | static int btrfs_setattr(struct dentry *dentry, struct iattr *attr) |
4920 | { | |
2b0143b5 | 4921 | struct inode *inode = d_inode(dentry); |
b83cc969 | 4922 | struct btrfs_root *root = BTRFS_I(inode)->root; |
9036c102 | 4923 | int err; |
39279cc3 | 4924 | |
b83cc969 LZ |
4925 | if (btrfs_root_readonly(root)) |
4926 | return -EROFS; | |
4927 | ||
9036c102 YZ |
4928 | err = inode_change_ok(inode, attr); |
4929 | if (err) | |
4930 | return err; | |
2bf5a725 | 4931 | |
5a3f23d5 | 4932 | if (S_ISREG(inode->i_mode) && (attr->ia_valid & ATTR_SIZE)) { |
3972f260 | 4933 | err = btrfs_setsize(inode, attr); |
8082510e YZ |
4934 | if (err) |
4935 | return err; | |
39279cc3 | 4936 | } |
9036c102 | 4937 | |
1025774c CH |
4938 | if (attr->ia_valid) { |
4939 | setattr_copy(inode, attr); | |
0c4d2d95 | 4940 | inode_inc_iversion(inode); |
22c44fe6 | 4941 | err = btrfs_dirty_inode(inode); |
1025774c | 4942 | |
22c44fe6 | 4943 | if (!err && attr->ia_valid & ATTR_MODE) |
996a710d | 4944 | err = posix_acl_chmod(inode, inode->i_mode); |
1025774c | 4945 | } |
33268eaf | 4946 | |
39279cc3 CM |
4947 | return err; |
4948 | } | |
61295eb8 | 4949 | |
131e404a FDBM |
4950 | /* |
4951 | * While truncating the inode pages during eviction, we get the VFS calling | |
4952 | * btrfs_invalidatepage() against each page of the inode. This is slow because | |
4953 | * the calls to btrfs_invalidatepage() result in a huge amount of calls to | |
4954 | * lock_extent_bits() and clear_extent_bit(), which keep merging and splitting | |
4955 | * extent_state structures over and over, wasting lots of time. | |
4956 | * | |
4957 | * Therefore if the inode is being evicted, let btrfs_invalidatepage() skip all | |
4958 | * those expensive operations on a per page basis and do only the ordered io | |
4959 | * finishing, while we release here the extent_map and extent_state structures, | |
4960 | * without the excessive merging and splitting. | |
4961 | */ | |
4962 | static void evict_inode_truncate_pages(struct inode *inode) | |
4963 | { | |
4964 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; | |
4965 | struct extent_map_tree *map_tree = &BTRFS_I(inode)->extent_tree; | |
4966 | struct rb_node *node; | |
4967 | ||
4968 | ASSERT(inode->i_state & I_FREEING); | |
91b0abe3 | 4969 | truncate_inode_pages_final(&inode->i_data); |
131e404a FDBM |
4970 | |
4971 | write_lock(&map_tree->lock); | |
4972 | while (!RB_EMPTY_ROOT(&map_tree->map)) { | |
4973 | struct extent_map *em; | |
4974 | ||
4975 | node = rb_first(&map_tree->map); | |
4976 | em = rb_entry(node, struct extent_map, rb_node); | |
180589ef WS |
4977 | clear_bit(EXTENT_FLAG_PINNED, &em->flags); |
4978 | clear_bit(EXTENT_FLAG_LOGGING, &em->flags); | |
131e404a FDBM |
4979 | remove_extent_mapping(map_tree, em); |
4980 | free_extent_map(em); | |
7064dd5c FM |
4981 | if (need_resched()) { |
4982 | write_unlock(&map_tree->lock); | |
4983 | cond_resched(); | |
4984 | write_lock(&map_tree->lock); | |
4985 | } | |
131e404a FDBM |
4986 | } |
4987 | write_unlock(&map_tree->lock); | |
4988 | ||
6ca07097 FM |
4989 | /* |
4990 | * Keep looping until we have no more ranges in the io tree. | |
4991 | * We can have ongoing bios started by readpages (called from readahead) | |
9c6429d9 FM |
4992 | * that have their endio callback (extent_io.c:end_bio_extent_readpage) |
4993 | * still in progress (unlocked the pages in the bio but did not yet | |
4994 | * unlocked the ranges in the io tree). Therefore this means some | |
6ca07097 FM |
4995 | * ranges can still be locked and eviction started because before |
4996 | * submitting those bios, which are executed by a separate task (work | |
4997 | * queue kthread), inode references (inode->i_count) were not taken | |
4998 | * (which would be dropped in the end io callback of each bio). | |
4999 | * Therefore here we effectively end up waiting for those bios and | |
5000 | * anyone else holding locked ranges without having bumped the inode's | |
5001 | * reference count - if we don't do it, when they access the inode's | |
5002 | * io_tree to unlock a range it may be too late, leading to an | |
5003 | * use-after-free issue. | |
5004 | */ | |
131e404a FDBM |
5005 | spin_lock(&io_tree->lock); |
5006 | while (!RB_EMPTY_ROOT(&io_tree->state)) { | |
5007 | struct extent_state *state; | |
5008 | struct extent_state *cached_state = NULL; | |
6ca07097 FM |
5009 | u64 start; |
5010 | u64 end; | |
131e404a FDBM |
5011 | |
5012 | node = rb_first(&io_tree->state); | |
5013 | state = rb_entry(node, struct extent_state, rb_node); | |
6ca07097 FM |
5014 | start = state->start; |
5015 | end = state->end; | |
131e404a FDBM |
5016 | spin_unlock(&io_tree->lock); |
5017 | ||
6ca07097 FM |
5018 | lock_extent_bits(io_tree, start, end, 0, &cached_state); |
5019 | clear_extent_bit(io_tree, start, end, | |
131e404a FDBM |
5020 | EXTENT_LOCKED | EXTENT_DIRTY | |
5021 | EXTENT_DELALLOC | EXTENT_DO_ACCOUNTING | | |
5022 | EXTENT_DEFRAG, 1, 1, | |
5023 | &cached_state, GFP_NOFS); | |
131e404a | 5024 | |
7064dd5c | 5025 | cond_resched(); |
131e404a FDBM |
5026 | spin_lock(&io_tree->lock); |
5027 | } | |
5028 | spin_unlock(&io_tree->lock); | |
5029 | } | |
5030 | ||
bd555975 | 5031 | void btrfs_evict_inode(struct inode *inode) |
39279cc3 CM |
5032 | { |
5033 | struct btrfs_trans_handle *trans; | |
5034 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
726c35fa | 5035 | struct btrfs_block_rsv *rsv, *global_rsv; |
3bce876f | 5036 | int steal_from_global = 0; |
07127184 | 5037 | u64 min_size = btrfs_calc_trunc_metadata_size(root, 1); |
39279cc3 CM |
5038 | int ret; |
5039 | ||
1abe9b8a | 5040 | trace_btrfs_inode_evict(inode); |
5041 | ||
131e404a FDBM |
5042 | evict_inode_truncate_pages(inode); |
5043 | ||
69e9c6c6 SB |
5044 | if (inode->i_nlink && |
5045 | ((btrfs_root_refs(&root->root_item) != 0 && | |
5046 | root->root_key.objectid != BTRFS_ROOT_TREE_OBJECTID) || | |
5047 | btrfs_is_free_space_inode(inode))) | |
bd555975 AV |
5048 | goto no_delete; |
5049 | ||
39279cc3 | 5050 | if (is_bad_inode(inode)) { |
7b128766 | 5051 | btrfs_orphan_del(NULL, inode); |
39279cc3 CM |
5052 | goto no_delete; |
5053 | } | |
bd555975 | 5054 | /* do we really want it for ->i_nlink > 0 and zero btrfs_root_refs? */ |
4a096752 | 5055 | btrfs_wait_ordered_range(inode, 0, (u64)-1); |
5f39d397 | 5056 | |
f612496b MX |
5057 | btrfs_free_io_failure_record(inode, 0, (u64)-1); |
5058 | ||
c71bf099 | 5059 | if (root->fs_info->log_root_recovering) { |
6bf02314 | 5060 | BUG_ON(test_bit(BTRFS_INODE_HAS_ORPHAN_ITEM, |
8a35d95f | 5061 | &BTRFS_I(inode)->runtime_flags)); |
c71bf099 YZ |
5062 | goto no_delete; |
5063 | } | |
5064 | ||
76dda93c | 5065 | if (inode->i_nlink > 0) { |
69e9c6c6 SB |
5066 | BUG_ON(btrfs_root_refs(&root->root_item) != 0 && |
5067 | root->root_key.objectid != BTRFS_ROOT_TREE_OBJECTID); | |
76dda93c YZ |
5068 | goto no_delete; |
5069 | } | |
5070 | ||
0e8c36a9 MX |
5071 | ret = btrfs_commit_inode_delayed_inode(inode); |
5072 | if (ret) { | |
5073 | btrfs_orphan_del(NULL, inode); | |
5074 | goto no_delete; | |
5075 | } | |
5076 | ||
66d8f3dd | 5077 | rsv = btrfs_alloc_block_rsv(root, BTRFS_BLOCK_RSV_TEMP); |
4289a667 JB |
5078 | if (!rsv) { |
5079 | btrfs_orphan_del(NULL, inode); | |
5080 | goto no_delete; | |
5081 | } | |
4a338542 | 5082 | rsv->size = min_size; |
ca7e70f5 | 5083 | rsv->failfast = 1; |
726c35fa | 5084 | global_rsv = &root->fs_info->global_block_rsv; |
4289a667 | 5085 | |
dbe674a9 | 5086 | btrfs_i_size_write(inode, 0); |
5f39d397 | 5087 | |
4289a667 | 5088 | /* |
8407aa46 MX |
5089 | * This is a bit simpler than btrfs_truncate since we've already |
5090 | * reserved our space for our orphan item in the unlink, so we just | |
5091 | * need to reserve some slack space in case we add bytes and update | |
5092 | * inode item when doing the truncate. | |
4289a667 | 5093 | */ |
8082510e | 5094 | while (1) { |
08e007d2 MX |
5095 | ret = btrfs_block_rsv_refill(root, rsv, min_size, |
5096 | BTRFS_RESERVE_FLUSH_LIMIT); | |
726c35fa JB |
5097 | |
5098 | /* | |
5099 | * Try and steal from the global reserve since we will | |
5100 | * likely not use this space anyway, we want to try as | |
5101 | * hard as possible to get this to work. | |
5102 | */ | |
5103 | if (ret) | |
3bce876f JB |
5104 | steal_from_global++; |
5105 | else | |
5106 | steal_from_global = 0; | |
5107 | ret = 0; | |
d68fc57b | 5108 | |
3bce876f JB |
5109 | /* |
5110 | * steal_from_global == 0: we reserved stuff, hooray! | |
5111 | * steal_from_global == 1: we didn't reserve stuff, boo! | |
5112 | * steal_from_global == 2: we've committed, still not a lot of | |
5113 | * room but maybe we'll have room in the global reserve this | |
5114 | * time. | |
5115 | * steal_from_global == 3: abandon all hope! | |
5116 | */ | |
5117 | if (steal_from_global > 2) { | |
c2cf52eb SK |
5118 | btrfs_warn(root->fs_info, |
5119 | "Could not get space for a delete, will truncate on mount %d", | |
5120 | ret); | |
4289a667 JB |
5121 | btrfs_orphan_del(NULL, inode); |
5122 | btrfs_free_block_rsv(root, rsv); | |
5123 | goto no_delete; | |
d68fc57b | 5124 | } |
7b128766 | 5125 | |
0e8c36a9 | 5126 | trans = btrfs_join_transaction(root); |
4289a667 JB |
5127 | if (IS_ERR(trans)) { |
5128 | btrfs_orphan_del(NULL, inode); | |
5129 | btrfs_free_block_rsv(root, rsv); | |
5130 | goto no_delete; | |
d68fc57b | 5131 | } |
7b128766 | 5132 | |
3bce876f JB |
5133 | /* |
5134 | * We can't just steal from the global reserve, we need tomake | |
5135 | * sure there is room to do it, if not we need to commit and try | |
5136 | * again. | |
5137 | */ | |
5138 | if (steal_from_global) { | |
5139 | if (!btrfs_check_space_for_delayed_refs(trans, root)) | |
5140 | ret = btrfs_block_rsv_migrate(global_rsv, rsv, | |
5141 | min_size); | |
5142 | else | |
5143 | ret = -ENOSPC; | |
5144 | } | |
5145 | ||
5146 | /* | |
5147 | * Couldn't steal from the global reserve, we have too much | |
5148 | * pending stuff built up, commit the transaction and try it | |
5149 | * again. | |
5150 | */ | |
5151 | if (ret) { | |
5152 | ret = btrfs_commit_transaction(trans, root); | |
5153 | if (ret) { | |
5154 | btrfs_orphan_del(NULL, inode); | |
5155 | btrfs_free_block_rsv(root, rsv); | |
5156 | goto no_delete; | |
5157 | } | |
5158 | continue; | |
5159 | } else { | |
5160 | steal_from_global = 0; | |
5161 | } | |
5162 | ||
4289a667 JB |
5163 | trans->block_rsv = rsv; |
5164 | ||
d68fc57b | 5165 | ret = btrfs_truncate_inode_items(trans, root, inode, 0, 0); |
28ed1345 | 5166 | if (ret != -ENOSPC && ret != -EAGAIN) |
8082510e | 5167 | break; |
85e21bac | 5168 | |
8407aa46 | 5169 | trans->block_rsv = &root->fs_info->trans_block_rsv; |
8082510e YZ |
5170 | btrfs_end_transaction(trans, root); |
5171 | trans = NULL; | |
b53d3f5d | 5172 | btrfs_btree_balance_dirty(root); |
8082510e | 5173 | } |
5f39d397 | 5174 | |
4289a667 JB |
5175 | btrfs_free_block_rsv(root, rsv); |
5176 | ||
4ef31a45 JB |
5177 | /* |
5178 | * Errors here aren't a big deal, it just means we leave orphan items | |
5179 | * in the tree. They will be cleaned up on the next mount. | |
5180 | */ | |
8082510e | 5181 | if (ret == 0) { |
4289a667 | 5182 | trans->block_rsv = root->orphan_block_rsv; |
4ef31a45 JB |
5183 | btrfs_orphan_del(trans, inode); |
5184 | } else { | |
5185 | btrfs_orphan_del(NULL, inode); | |
8082510e | 5186 | } |
54aa1f4d | 5187 | |
4289a667 | 5188 | trans->block_rsv = &root->fs_info->trans_block_rsv; |
581bb050 LZ |
5189 | if (!(root == root->fs_info->tree_root || |
5190 | root->root_key.objectid == BTRFS_TREE_RELOC_OBJECTID)) | |
33345d01 | 5191 | btrfs_return_ino(root, btrfs_ino(inode)); |
581bb050 | 5192 | |
54aa1f4d | 5193 | btrfs_end_transaction(trans, root); |
b53d3f5d | 5194 | btrfs_btree_balance_dirty(root); |
39279cc3 | 5195 | no_delete: |
89042e5a | 5196 | btrfs_remove_delayed_node(inode); |
dbd5768f | 5197 | clear_inode(inode); |
8082510e | 5198 | return; |
39279cc3 CM |
5199 | } |
5200 | ||
5201 | /* | |
5202 | * this returns the key found in the dir entry in the location pointer. | |
5203 | * If no dir entries were found, location->objectid is 0. | |
5204 | */ | |
5205 | static int btrfs_inode_by_name(struct inode *dir, struct dentry *dentry, | |
5206 | struct btrfs_key *location) | |
5207 | { | |
5208 | const char *name = dentry->d_name.name; | |
5209 | int namelen = dentry->d_name.len; | |
5210 | struct btrfs_dir_item *di; | |
5211 | struct btrfs_path *path; | |
5212 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
0d9f7f3e | 5213 | int ret = 0; |
39279cc3 CM |
5214 | |
5215 | path = btrfs_alloc_path(); | |
d8926bb3 MF |
5216 | if (!path) |
5217 | return -ENOMEM; | |
3954401f | 5218 | |
33345d01 | 5219 | di = btrfs_lookup_dir_item(NULL, root, path, btrfs_ino(dir), name, |
39279cc3 | 5220 | namelen, 0); |
0d9f7f3e Y |
5221 | if (IS_ERR(di)) |
5222 | ret = PTR_ERR(di); | |
d397712b | 5223 | |
c704005d | 5224 | if (IS_ERR_OR_NULL(di)) |
3954401f | 5225 | goto out_err; |
d397712b | 5226 | |
5f39d397 | 5227 | btrfs_dir_item_key_to_cpu(path->nodes[0], di, location); |
39279cc3 | 5228 | out: |
39279cc3 CM |
5229 | btrfs_free_path(path); |
5230 | return ret; | |
3954401f CM |
5231 | out_err: |
5232 | location->objectid = 0; | |
5233 | goto out; | |
39279cc3 CM |
5234 | } |
5235 | ||
5236 | /* | |
5237 | * when we hit a tree root in a directory, the btrfs part of the inode | |
5238 | * needs to be changed to reflect the root directory of the tree root. This | |
5239 | * is kind of like crossing a mount point. | |
5240 | */ | |
5241 | static int fixup_tree_root_location(struct btrfs_root *root, | |
4df27c4d YZ |
5242 | struct inode *dir, |
5243 | struct dentry *dentry, | |
5244 | struct btrfs_key *location, | |
5245 | struct btrfs_root **sub_root) | |
39279cc3 | 5246 | { |
4df27c4d YZ |
5247 | struct btrfs_path *path; |
5248 | struct btrfs_root *new_root; | |
5249 | struct btrfs_root_ref *ref; | |
5250 | struct extent_buffer *leaf; | |
1d4c08e0 | 5251 | struct btrfs_key key; |
4df27c4d YZ |
5252 | int ret; |
5253 | int err = 0; | |
39279cc3 | 5254 | |
4df27c4d YZ |
5255 | path = btrfs_alloc_path(); |
5256 | if (!path) { | |
5257 | err = -ENOMEM; | |
5258 | goto out; | |
5259 | } | |
39279cc3 | 5260 | |
4df27c4d | 5261 | err = -ENOENT; |
1d4c08e0 DS |
5262 | key.objectid = BTRFS_I(dir)->root->root_key.objectid; |
5263 | key.type = BTRFS_ROOT_REF_KEY; | |
5264 | key.offset = location->objectid; | |
5265 | ||
5266 | ret = btrfs_search_slot(NULL, root->fs_info->tree_root, &key, path, | |
5267 | 0, 0); | |
4df27c4d YZ |
5268 | if (ret) { |
5269 | if (ret < 0) | |
5270 | err = ret; | |
5271 | goto out; | |
5272 | } | |
39279cc3 | 5273 | |
4df27c4d YZ |
5274 | leaf = path->nodes[0]; |
5275 | ref = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_root_ref); | |
33345d01 | 5276 | if (btrfs_root_ref_dirid(leaf, ref) != btrfs_ino(dir) || |
4df27c4d YZ |
5277 | btrfs_root_ref_name_len(leaf, ref) != dentry->d_name.len) |
5278 | goto out; | |
39279cc3 | 5279 | |
4df27c4d YZ |
5280 | ret = memcmp_extent_buffer(leaf, dentry->d_name.name, |
5281 | (unsigned long)(ref + 1), | |
5282 | dentry->d_name.len); | |
5283 | if (ret) | |
5284 | goto out; | |
5285 | ||
b3b4aa74 | 5286 | btrfs_release_path(path); |
4df27c4d YZ |
5287 | |
5288 | new_root = btrfs_read_fs_root_no_name(root->fs_info, location); | |
5289 | if (IS_ERR(new_root)) { | |
5290 | err = PTR_ERR(new_root); | |
5291 | goto out; | |
5292 | } | |
5293 | ||
4df27c4d YZ |
5294 | *sub_root = new_root; |
5295 | location->objectid = btrfs_root_dirid(&new_root->root_item); | |
5296 | location->type = BTRFS_INODE_ITEM_KEY; | |
5297 | location->offset = 0; | |
5298 | err = 0; | |
5299 | out: | |
5300 | btrfs_free_path(path); | |
5301 | return err; | |
39279cc3 CM |
5302 | } |
5303 | ||
5d4f98a2 YZ |
5304 | static void inode_tree_add(struct inode *inode) |
5305 | { | |
5306 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
5307 | struct btrfs_inode *entry; | |
03e860bd FNP |
5308 | struct rb_node **p; |
5309 | struct rb_node *parent; | |
cef21937 | 5310 | struct rb_node *new = &BTRFS_I(inode)->rb_node; |
33345d01 | 5311 | u64 ino = btrfs_ino(inode); |
5d4f98a2 | 5312 | |
1d3382cb | 5313 | if (inode_unhashed(inode)) |
76dda93c | 5314 | return; |
e1409cef | 5315 | parent = NULL; |
5d4f98a2 | 5316 | spin_lock(&root->inode_lock); |
e1409cef | 5317 | p = &root->inode_tree.rb_node; |
5d4f98a2 YZ |
5318 | while (*p) { |
5319 | parent = *p; | |
5320 | entry = rb_entry(parent, struct btrfs_inode, rb_node); | |
5321 | ||
33345d01 | 5322 | if (ino < btrfs_ino(&entry->vfs_inode)) |
03e860bd | 5323 | p = &parent->rb_left; |
33345d01 | 5324 | else if (ino > btrfs_ino(&entry->vfs_inode)) |
03e860bd | 5325 | p = &parent->rb_right; |
5d4f98a2 YZ |
5326 | else { |
5327 | WARN_ON(!(entry->vfs_inode.i_state & | |
a4ffdde6 | 5328 | (I_WILL_FREE | I_FREEING))); |
cef21937 | 5329 | rb_replace_node(parent, new, &root->inode_tree); |
03e860bd FNP |
5330 | RB_CLEAR_NODE(parent); |
5331 | spin_unlock(&root->inode_lock); | |
cef21937 | 5332 | return; |
5d4f98a2 YZ |
5333 | } |
5334 | } | |
cef21937 FDBM |
5335 | rb_link_node(new, parent, p); |
5336 | rb_insert_color(new, &root->inode_tree); | |
5d4f98a2 YZ |
5337 | spin_unlock(&root->inode_lock); |
5338 | } | |
5339 | ||
5340 | static void inode_tree_del(struct inode *inode) | |
5341 | { | |
5342 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
76dda93c | 5343 | int empty = 0; |
5d4f98a2 | 5344 | |
03e860bd | 5345 | spin_lock(&root->inode_lock); |
5d4f98a2 | 5346 | if (!RB_EMPTY_NODE(&BTRFS_I(inode)->rb_node)) { |
5d4f98a2 | 5347 | rb_erase(&BTRFS_I(inode)->rb_node, &root->inode_tree); |
5d4f98a2 | 5348 | RB_CLEAR_NODE(&BTRFS_I(inode)->rb_node); |
76dda93c | 5349 | empty = RB_EMPTY_ROOT(&root->inode_tree); |
5d4f98a2 | 5350 | } |
03e860bd | 5351 | spin_unlock(&root->inode_lock); |
76dda93c | 5352 | |
69e9c6c6 | 5353 | if (empty && btrfs_root_refs(&root->root_item) == 0) { |
76dda93c YZ |
5354 | synchronize_srcu(&root->fs_info->subvol_srcu); |
5355 | spin_lock(&root->inode_lock); | |
5356 | empty = RB_EMPTY_ROOT(&root->inode_tree); | |
5357 | spin_unlock(&root->inode_lock); | |
5358 | if (empty) | |
5359 | btrfs_add_dead_root(root); | |
5360 | } | |
5361 | } | |
5362 | ||
143bede5 | 5363 | void btrfs_invalidate_inodes(struct btrfs_root *root) |
76dda93c YZ |
5364 | { |
5365 | struct rb_node *node; | |
5366 | struct rb_node *prev; | |
5367 | struct btrfs_inode *entry; | |
5368 | struct inode *inode; | |
5369 | u64 objectid = 0; | |
5370 | ||
7813b3db LB |
5371 | if (!test_bit(BTRFS_FS_STATE_ERROR, &root->fs_info->fs_state)) |
5372 | WARN_ON(btrfs_root_refs(&root->root_item) != 0); | |
76dda93c YZ |
5373 | |
5374 | spin_lock(&root->inode_lock); | |
5375 | again: | |
5376 | node = root->inode_tree.rb_node; | |
5377 | prev = NULL; | |
5378 | while (node) { | |
5379 | prev = node; | |
5380 | entry = rb_entry(node, struct btrfs_inode, rb_node); | |
5381 | ||
33345d01 | 5382 | if (objectid < btrfs_ino(&entry->vfs_inode)) |
76dda93c | 5383 | node = node->rb_left; |
33345d01 | 5384 | else if (objectid > btrfs_ino(&entry->vfs_inode)) |
76dda93c YZ |
5385 | node = node->rb_right; |
5386 | else | |
5387 | break; | |
5388 | } | |
5389 | if (!node) { | |
5390 | while (prev) { | |
5391 | entry = rb_entry(prev, struct btrfs_inode, rb_node); | |
33345d01 | 5392 | if (objectid <= btrfs_ino(&entry->vfs_inode)) { |
76dda93c YZ |
5393 | node = prev; |
5394 | break; | |
5395 | } | |
5396 | prev = rb_next(prev); | |
5397 | } | |
5398 | } | |
5399 | while (node) { | |
5400 | entry = rb_entry(node, struct btrfs_inode, rb_node); | |
33345d01 | 5401 | objectid = btrfs_ino(&entry->vfs_inode) + 1; |
76dda93c YZ |
5402 | inode = igrab(&entry->vfs_inode); |
5403 | if (inode) { | |
5404 | spin_unlock(&root->inode_lock); | |
5405 | if (atomic_read(&inode->i_count) > 1) | |
5406 | d_prune_aliases(inode); | |
5407 | /* | |
45321ac5 | 5408 | * btrfs_drop_inode will have it removed from |
76dda93c YZ |
5409 | * the inode cache when its usage count |
5410 | * hits zero. | |
5411 | */ | |
5412 | iput(inode); | |
5413 | cond_resched(); | |
5414 | spin_lock(&root->inode_lock); | |
5415 | goto again; | |
5416 | } | |
5417 | ||
5418 | if (cond_resched_lock(&root->inode_lock)) | |
5419 | goto again; | |
5420 | ||
5421 | node = rb_next(node); | |
5422 | } | |
5423 | spin_unlock(&root->inode_lock); | |
5d4f98a2 YZ |
5424 | } |
5425 | ||
e02119d5 CM |
5426 | static int btrfs_init_locked_inode(struct inode *inode, void *p) |
5427 | { | |
5428 | struct btrfs_iget_args *args = p; | |
90d3e592 CM |
5429 | inode->i_ino = args->location->objectid; |
5430 | memcpy(&BTRFS_I(inode)->location, args->location, | |
5431 | sizeof(*args->location)); | |
e02119d5 | 5432 | BTRFS_I(inode)->root = args->root; |
39279cc3 CM |
5433 | return 0; |
5434 | } | |
5435 | ||
5436 | static int btrfs_find_actor(struct inode *inode, void *opaque) | |
5437 | { | |
5438 | struct btrfs_iget_args *args = opaque; | |
90d3e592 | 5439 | return args->location->objectid == BTRFS_I(inode)->location.objectid && |
d397712b | 5440 | args->root == BTRFS_I(inode)->root; |
39279cc3 CM |
5441 | } |
5442 | ||
5d4f98a2 | 5443 | static struct inode *btrfs_iget_locked(struct super_block *s, |
90d3e592 | 5444 | struct btrfs_key *location, |
5d4f98a2 | 5445 | struct btrfs_root *root) |
39279cc3 CM |
5446 | { |
5447 | struct inode *inode; | |
5448 | struct btrfs_iget_args args; | |
90d3e592 | 5449 | unsigned long hashval = btrfs_inode_hash(location->objectid, root); |
778ba82b | 5450 | |
90d3e592 | 5451 | args.location = location; |
39279cc3 CM |
5452 | args.root = root; |
5453 | ||
778ba82b | 5454 | inode = iget5_locked(s, hashval, btrfs_find_actor, |
39279cc3 CM |
5455 | btrfs_init_locked_inode, |
5456 | (void *)&args); | |
5457 | return inode; | |
5458 | } | |
5459 | ||
1a54ef8c BR |
5460 | /* Get an inode object given its location and corresponding root. |
5461 | * Returns in *is_new if the inode was read from disk | |
5462 | */ | |
5463 | struct inode *btrfs_iget(struct super_block *s, struct btrfs_key *location, | |
73f73415 | 5464 | struct btrfs_root *root, int *new) |
1a54ef8c BR |
5465 | { |
5466 | struct inode *inode; | |
5467 | ||
90d3e592 | 5468 | inode = btrfs_iget_locked(s, location, root); |
1a54ef8c | 5469 | if (!inode) |
5d4f98a2 | 5470 | return ERR_PTR(-ENOMEM); |
1a54ef8c BR |
5471 | |
5472 | if (inode->i_state & I_NEW) { | |
1a54ef8c | 5473 | btrfs_read_locked_inode(inode); |
1748f843 MF |
5474 | if (!is_bad_inode(inode)) { |
5475 | inode_tree_add(inode); | |
5476 | unlock_new_inode(inode); | |
5477 | if (new) | |
5478 | *new = 1; | |
5479 | } else { | |
e0b6d65b ST |
5480 | unlock_new_inode(inode); |
5481 | iput(inode); | |
5482 | inode = ERR_PTR(-ESTALE); | |
1748f843 MF |
5483 | } |
5484 | } | |
5485 | ||
1a54ef8c BR |
5486 | return inode; |
5487 | } | |
5488 | ||
4df27c4d YZ |
5489 | static struct inode *new_simple_dir(struct super_block *s, |
5490 | struct btrfs_key *key, | |
5491 | struct btrfs_root *root) | |
5492 | { | |
5493 | struct inode *inode = new_inode(s); | |
5494 | ||
5495 | if (!inode) | |
5496 | return ERR_PTR(-ENOMEM); | |
5497 | ||
4df27c4d YZ |
5498 | BTRFS_I(inode)->root = root; |
5499 | memcpy(&BTRFS_I(inode)->location, key, sizeof(*key)); | |
72ac3c0d | 5500 | set_bit(BTRFS_INODE_DUMMY, &BTRFS_I(inode)->runtime_flags); |
4df27c4d YZ |
5501 | |
5502 | inode->i_ino = BTRFS_EMPTY_SUBVOL_DIR_OBJECTID; | |
848cce0d | 5503 | inode->i_op = &btrfs_dir_ro_inode_operations; |
4df27c4d YZ |
5504 | inode->i_fop = &simple_dir_operations; |
5505 | inode->i_mode = S_IFDIR | S_IRUGO | S_IWUSR | S_IXUGO; | |
9cc97d64 | 5506 | inode->i_mtime = CURRENT_TIME; |
5507 | inode->i_atime = inode->i_mtime; | |
5508 | inode->i_ctime = inode->i_mtime; | |
5509 | BTRFS_I(inode)->i_otime = inode->i_mtime; | |
4df27c4d YZ |
5510 | |
5511 | return inode; | |
5512 | } | |
5513 | ||
3de4586c | 5514 | struct inode *btrfs_lookup_dentry(struct inode *dir, struct dentry *dentry) |
39279cc3 | 5515 | { |
d397712b | 5516 | struct inode *inode; |
4df27c4d | 5517 | struct btrfs_root *root = BTRFS_I(dir)->root; |
39279cc3 CM |
5518 | struct btrfs_root *sub_root = root; |
5519 | struct btrfs_key location; | |
76dda93c | 5520 | int index; |
b4aff1f8 | 5521 | int ret = 0; |
39279cc3 CM |
5522 | |
5523 | if (dentry->d_name.len > BTRFS_NAME_LEN) | |
5524 | return ERR_PTR(-ENAMETOOLONG); | |
5f39d397 | 5525 | |
39e3c955 | 5526 | ret = btrfs_inode_by_name(dir, dentry, &location); |
39279cc3 CM |
5527 | if (ret < 0) |
5528 | return ERR_PTR(ret); | |
5f39d397 | 5529 | |
4df27c4d | 5530 | if (location.objectid == 0) |
5662344b | 5531 | return ERR_PTR(-ENOENT); |
4df27c4d YZ |
5532 | |
5533 | if (location.type == BTRFS_INODE_ITEM_KEY) { | |
73f73415 | 5534 | inode = btrfs_iget(dir->i_sb, &location, root, NULL); |
4df27c4d YZ |
5535 | return inode; |
5536 | } | |
5537 | ||
5538 | BUG_ON(location.type != BTRFS_ROOT_ITEM_KEY); | |
5539 | ||
76dda93c | 5540 | index = srcu_read_lock(&root->fs_info->subvol_srcu); |
4df27c4d YZ |
5541 | ret = fixup_tree_root_location(root, dir, dentry, |
5542 | &location, &sub_root); | |
5543 | if (ret < 0) { | |
5544 | if (ret != -ENOENT) | |
5545 | inode = ERR_PTR(ret); | |
5546 | else | |
5547 | inode = new_simple_dir(dir->i_sb, &location, sub_root); | |
5548 | } else { | |
73f73415 | 5549 | inode = btrfs_iget(dir->i_sb, &location, sub_root, NULL); |
39279cc3 | 5550 | } |
76dda93c YZ |
5551 | srcu_read_unlock(&root->fs_info->subvol_srcu, index); |
5552 | ||
34d19bad | 5553 | if (!IS_ERR(inode) && root != sub_root) { |
c71bf099 YZ |
5554 | down_read(&root->fs_info->cleanup_work_sem); |
5555 | if (!(inode->i_sb->s_flags & MS_RDONLY)) | |
66b4ffd1 | 5556 | ret = btrfs_orphan_cleanup(sub_root); |
c71bf099 | 5557 | up_read(&root->fs_info->cleanup_work_sem); |
01cd3367 JB |
5558 | if (ret) { |
5559 | iput(inode); | |
66b4ffd1 | 5560 | inode = ERR_PTR(ret); |
01cd3367 | 5561 | } |
c71bf099 YZ |
5562 | } |
5563 | ||
3de4586c CM |
5564 | return inode; |
5565 | } | |
5566 | ||
fe15ce44 | 5567 | static int btrfs_dentry_delete(const struct dentry *dentry) |
76dda93c YZ |
5568 | { |
5569 | struct btrfs_root *root; | |
2b0143b5 | 5570 | struct inode *inode = d_inode(dentry); |
76dda93c | 5571 | |
848cce0d | 5572 | if (!inode && !IS_ROOT(dentry)) |
2b0143b5 | 5573 | inode = d_inode(dentry->d_parent); |
76dda93c | 5574 | |
848cce0d LZ |
5575 | if (inode) { |
5576 | root = BTRFS_I(inode)->root; | |
efefb143 YZ |
5577 | if (btrfs_root_refs(&root->root_item) == 0) |
5578 | return 1; | |
848cce0d LZ |
5579 | |
5580 | if (btrfs_ino(inode) == BTRFS_EMPTY_SUBVOL_DIR_OBJECTID) | |
5581 | return 1; | |
efefb143 | 5582 | } |
76dda93c YZ |
5583 | return 0; |
5584 | } | |
5585 | ||
b4aff1f8 JB |
5586 | static void btrfs_dentry_release(struct dentry *dentry) |
5587 | { | |
944a4515 | 5588 | kfree(dentry->d_fsdata); |
b4aff1f8 JB |
5589 | } |
5590 | ||
3de4586c | 5591 | static struct dentry *btrfs_lookup(struct inode *dir, struct dentry *dentry, |
00cd8dd3 | 5592 | unsigned int flags) |
3de4586c | 5593 | { |
5662344b | 5594 | struct inode *inode; |
a66e7cc6 | 5595 | |
5662344b TI |
5596 | inode = btrfs_lookup_dentry(dir, dentry); |
5597 | if (IS_ERR(inode)) { | |
5598 | if (PTR_ERR(inode) == -ENOENT) | |
5599 | inode = NULL; | |
5600 | else | |
5601 | return ERR_CAST(inode); | |
5602 | } | |
5603 | ||
41d28bca | 5604 | return d_splice_alias(inode, dentry); |
39279cc3 CM |
5605 | } |
5606 | ||
16cdcec7 | 5607 | unsigned char btrfs_filetype_table[] = { |
39279cc3 CM |
5608 | DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK |
5609 | }; | |
5610 | ||
9cdda8d3 | 5611 | static int btrfs_real_readdir(struct file *file, struct dir_context *ctx) |
39279cc3 | 5612 | { |
9cdda8d3 | 5613 | struct inode *inode = file_inode(file); |
39279cc3 CM |
5614 | struct btrfs_root *root = BTRFS_I(inode)->root; |
5615 | struct btrfs_item *item; | |
5616 | struct btrfs_dir_item *di; | |
5617 | struct btrfs_key key; | |
5f39d397 | 5618 | struct btrfs_key found_key; |
39279cc3 | 5619 | struct btrfs_path *path; |
16cdcec7 MX |
5620 | struct list_head ins_list; |
5621 | struct list_head del_list; | |
39279cc3 | 5622 | int ret; |
5f39d397 | 5623 | struct extent_buffer *leaf; |
39279cc3 | 5624 | int slot; |
39279cc3 CM |
5625 | unsigned char d_type; |
5626 | int over = 0; | |
5627 | u32 di_cur; | |
5628 | u32 di_total; | |
5629 | u32 di_len; | |
5630 | int key_type = BTRFS_DIR_INDEX_KEY; | |
5f39d397 CM |
5631 | char tmp_name[32]; |
5632 | char *name_ptr; | |
5633 | int name_len; | |
9cdda8d3 | 5634 | int is_curr = 0; /* ctx->pos points to the current index? */ |
39279cc3 CM |
5635 | |
5636 | /* FIXME, use a real flag for deciding about the key type */ | |
5637 | if (root->fs_info->tree_root == root) | |
5638 | key_type = BTRFS_DIR_ITEM_KEY; | |
5f39d397 | 5639 | |
9cdda8d3 AV |
5640 | if (!dir_emit_dots(file, ctx)) |
5641 | return 0; | |
5642 | ||
49593bfa | 5643 | path = btrfs_alloc_path(); |
16cdcec7 MX |
5644 | if (!path) |
5645 | return -ENOMEM; | |
ff5714cc | 5646 | |
026fd317 | 5647 | path->reada = 1; |
49593bfa | 5648 | |
16cdcec7 MX |
5649 | if (key_type == BTRFS_DIR_INDEX_KEY) { |
5650 | INIT_LIST_HEAD(&ins_list); | |
5651 | INIT_LIST_HEAD(&del_list); | |
5652 | btrfs_get_delayed_items(inode, &ins_list, &del_list); | |
5653 | } | |
5654 | ||
962a298f | 5655 | key.type = key_type; |
9cdda8d3 | 5656 | key.offset = ctx->pos; |
33345d01 | 5657 | key.objectid = btrfs_ino(inode); |
5f39d397 | 5658 | |
39279cc3 CM |
5659 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); |
5660 | if (ret < 0) | |
5661 | goto err; | |
49593bfa DW |
5662 | |
5663 | while (1) { | |
5f39d397 | 5664 | leaf = path->nodes[0]; |
39279cc3 | 5665 | slot = path->slots[0]; |
b9e03af0 LZ |
5666 | if (slot >= btrfs_header_nritems(leaf)) { |
5667 | ret = btrfs_next_leaf(root, path); | |
5668 | if (ret < 0) | |
5669 | goto err; | |
5670 | else if (ret > 0) | |
5671 | break; | |
5672 | continue; | |
39279cc3 | 5673 | } |
3de4586c | 5674 | |
dd3cc16b | 5675 | item = btrfs_item_nr(slot); |
5f39d397 CM |
5676 | btrfs_item_key_to_cpu(leaf, &found_key, slot); |
5677 | ||
5678 | if (found_key.objectid != key.objectid) | |
39279cc3 | 5679 | break; |
962a298f | 5680 | if (found_key.type != key_type) |
39279cc3 | 5681 | break; |
9cdda8d3 | 5682 | if (found_key.offset < ctx->pos) |
b9e03af0 | 5683 | goto next; |
16cdcec7 MX |
5684 | if (key_type == BTRFS_DIR_INDEX_KEY && |
5685 | btrfs_should_delete_dir_index(&del_list, | |
5686 | found_key.offset)) | |
5687 | goto next; | |
5f39d397 | 5688 | |
9cdda8d3 | 5689 | ctx->pos = found_key.offset; |
16cdcec7 | 5690 | is_curr = 1; |
49593bfa | 5691 | |
39279cc3 CM |
5692 | di = btrfs_item_ptr(leaf, slot, struct btrfs_dir_item); |
5693 | di_cur = 0; | |
5f39d397 | 5694 | di_total = btrfs_item_size(leaf, item); |
49593bfa DW |
5695 | |
5696 | while (di_cur < di_total) { | |
5f39d397 CM |
5697 | struct btrfs_key location; |
5698 | ||
22a94d44 JB |
5699 | if (verify_dir_item(root, leaf, di)) |
5700 | break; | |
5701 | ||
5f39d397 | 5702 | name_len = btrfs_dir_name_len(leaf, di); |
49593bfa | 5703 | if (name_len <= sizeof(tmp_name)) { |
5f39d397 CM |
5704 | name_ptr = tmp_name; |
5705 | } else { | |
5706 | name_ptr = kmalloc(name_len, GFP_NOFS); | |
49593bfa DW |
5707 | if (!name_ptr) { |
5708 | ret = -ENOMEM; | |
5709 | goto err; | |
5710 | } | |
5f39d397 CM |
5711 | } |
5712 | read_extent_buffer(leaf, name_ptr, | |
5713 | (unsigned long)(di + 1), name_len); | |
5714 | ||
5715 | d_type = btrfs_filetype_table[btrfs_dir_type(leaf, di)]; | |
5716 | btrfs_dir_item_key_to_cpu(leaf, di, &location); | |
3de4586c | 5717 | |
fede766f | 5718 | |
3de4586c | 5719 | /* is this a reference to our own snapshot? If so |
8c9c2bf7 AJ |
5720 | * skip it. |
5721 | * | |
5722 | * In contrast to old kernels, we insert the snapshot's | |
5723 | * dir item and dir index after it has been created, so | |
5724 | * we won't find a reference to our own snapshot. We | |
5725 | * still keep the following code for backward | |
5726 | * compatibility. | |
3de4586c CM |
5727 | */ |
5728 | if (location.type == BTRFS_ROOT_ITEM_KEY && | |
5729 | location.objectid == root->root_key.objectid) { | |
5730 | over = 0; | |
5731 | goto skip; | |
5732 | } | |
9cdda8d3 AV |
5733 | over = !dir_emit(ctx, name_ptr, name_len, |
5734 | location.objectid, d_type); | |
5f39d397 | 5735 | |
3de4586c | 5736 | skip: |
5f39d397 CM |
5737 | if (name_ptr != tmp_name) |
5738 | kfree(name_ptr); | |
5739 | ||
39279cc3 CM |
5740 | if (over) |
5741 | goto nopos; | |
5103e947 | 5742 | di_len = btrfs_dir_name_len(leaf, di) + |
49593bfa | 5743 | btrfs_dir_data_len(leaf, di) + sizeof(*di); |
39279cc3 CM |
5744 | di_cur += di_len; |
5745 | di = (struct btrfs_dir_item *)((char *)di + di_len); | |
5746 | } | |
b9e03af0 LZ |
5747 | next: |
5748 | path->slots[0]++; | |
39279cc3 | 5749 | } |
49593bfa | 5750 | |
16cdcec7 MX |
5751 | if (key_type == BTRFS_DIR_INDEX_KEY) { |
5752 | if (is_curr) | |
9cdda8d3 AV |
5753 | ctx->pos++; |
5754 | ret = btrfs_readdir_delayed_dir_index(ctx, &ins_list); | |
16cdcec7 MX |
5755 | if (ret) |
5756 | goto nopos; | |
5757 | } | |
5758 | ||
49593bfa | 5759 | /* Reached end of directory/root. Bump pos past the last item. */ |
db62efbb ZB |
5760 | ctx->pos++; |
5761 | ||
5762 | /* | |
5763 | * Stop new entries from being returned after we return the last | |
5764 | * entry. | |
5765 | * | |
5766 | * New directory entries are assigned a strictly increasing | |
5767 | * offset. This means that new entries created during readdir | |
5768 | * are *guaranteed* to be seen in the future by that readdir. | |
5769 | * This has broken buggy programs which operate on names as | |
5770 | * they're returned by readdir. Until we re-use freed offsets | |
5771 | * we have this hack to stop new entries from being returned | |
5772 | * under the assumption that they'll never reach this huge | |
5773 | * offset. | |
5774 | * | |
5775 | * This is being careful not to overflow 32bit loff_t unless the | |
5776 | * last entry requires it because doing so has broken 32bit apps | |
5777 | * in the past. | |
5778 | */ | |
5779 | if (key_type == BTRFS_DIR_INDEX_KEY) { | |
5780 | if (ctx->pos >= INT_MAX) | |
5781 | ctx->pos = LLONG_MAX; | |
5782 | else | |
5783 | ctx->pos = INT_MAX; | |
5784 | } | |
39279cc3 CM |
5785 | nopos: |
5786 | ret = 0; | |
5787 | err: | |
16cdcec7 MX |
5788 | if (key_type == BTRFS_DIR_INDEX_KEY) |
5789 | btrfs_put_delayed_items(&ins_list, &del_list); | |
39279cc3 | 5790 | btrfs_free_path(path); |
39279cc3 CM |
5791 | return ret; |
5792 | } | |
5793 | ||
a9185b41 | 5794 | int btrfs_write_inode(struct inode *inode, struct writeback_control *wbc) |
39279cc3 CM |
5795 | { |
5796 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
5797 | struct btrfs_trans_handle *trans; | |
5798 | int ret = 0; | |
0af3d00b | 5799 | bool nolock = false; |
39279cc3 | 5800 | |
72ac3c0d | 5801 | if (test_bit(BTRFS_INODE_DUMMY, &BTRFS_I(inode)->runtime_flags)) |
4ca8b41e CM |
5802 | return 0; |
5803 | ||
83eea1f1 | 5804 | if (btrfs_fs_closing(root->fs_info) && btrfs_is_free_space_inode(inode)) |
82d5902d | 5805 | nolock = true; |
0af3d00b | 5806 | |
a9185b41 | 5807 | if (wbc->sync_mode == WB_SYNC_ALL) { |
0af3d00b | 5808 | if (nolock) |
7a7eaa40 | 5809 | trans = btrfs_join_transaction_nolock(root); |
0af3d00b | 5810 | else |
7a7eaa40 | 5811 | trans = btrfs_join_transaction(root); |
3612b495 TI |
5812 | if (IS_ERR(trans)) |
5813 | return PTR_ERR(trans); | |
a698d075 | 5814 | ret = btrfs_commit_transaction(trans, root); |
39279cc3 CM |
5815 | } |
5816 | return ret; | |
5817 | } | |
5818 | ||
5819 | /* | |
54aa1f4d | 5820 | * This is somewhat expensive, updating the tree every time the |
39279cc3 CM |
5821 | * inode changes. But, it is most likely to find the inode in cache. |
5822 | * FIXME, needs more benchmarking...there are no reasons other than performance | |
5823 | * to keep or drop this code. | |
5824 | */ | |
48a3b636 | 5825 | static int btrfs_dirty_inode(struct inode *inode) |
39279cc3 CM |
5826 | { |
5827 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
5828 | struct btrfs_trans_handle *trans; | |
8929ecfa YZ |
5829 | int ret; |
5830 | ||
72ac3c0d | 5831 | if (test_bit(BTRFS_INODE_DUMMY, &BTRFS_I(inode)->runtime_flags)) |
22c44fe6 | 5832 | return 0; |
39279cc3 | 5833 | |
7a7eaa40 | 5834 | trans = btrfs_join_transaction(root); |
22c44fe6 JB |
5835 | if (IS_ERR(trans)) |
5836 | return PTR_ERR(trans); | |
8929ecfa YZ |
5837 | |
5838 | ret = btrfs_update_inode(trans, root, inode); | |
94b60442 CM |
5839 | if (ret && ret == -ENOSPC) { |
5840 | /* whoops, lets try again with the full transaction */ | |
5841 | btrfs_end_transaction(trans, root); | |
5842 | trans = btrfs_start_transaction(root, 1); | |
22c44fe6 JB |
5843 | if (IS_ERR(trans)) |
5844 | return PTR_ERR(trans); | |
8929ecfa | 5845 | |
94b60442 | 5846 | ret = btrfs_update_inode(trans, root, inode); |
94b60442 | 5847 | } |
39279cc3 | 5848 | btrfs_end_transaction(trans, root); |
16cdcec7 MX |
5849 | if (BTRFS_I(inode)->delayed_node) |
5850 | btrfs_balance_delayed_items(root); | |
22c44fe6 JB |
5851 | |
5852 | return ret; | |
5853 | } | |
5854 | ||
5855 | /* | |
5856 | * This is a copy of file_update_time. We need this so we can return error on | |
5857 | * ENOSPC for updating the inode in the case of file write and mmap writes. | |
5858 | */ | |
e41f941a JB |
5859 | static int btrfs_update_time(struct inode *inode, struct timespec *now, |
5860 | int flags) | |
22c44fe6 | 5861 | { |
2bc55652 AB |
5862 | struct btrfs_root *root = BTRFS_I(inode)->root; |
5863 | ||
5864 | if (btrfs_root_readonly(root)) | |
5865 | return -EROFS; | |
5866 | ||
e41f941a | 5867 | if (flags & S_VERSION) |
22c44fe6 | 5868 | inode_inc_iversion(inode); |
e41f941a JB |
5869 | if (flags & S_CTIME) |
5870 | inode->i_ctime = *now; | |
5871 | if (flags & S_MTIME) | |
5872 | inode->i_mtime = *now; | |
5873 | if (flags & S_ATIME) | |
5874 | inode->i_atime = *now; | |
5875 | return btrfs_dirty_inode(inode); | |
39279cc3 CM |
5876 | } |
5877 | ||
d352ac68 CM |
5878 | /* |
5879 | * find the highest existing sequence number in a directory | |
5880 | * and then set the in-memory index_cnt variable to reflect | |
5881 | * free sequence numbers | |
5882 | */ | |
aec7477b JB |
5883 | static int btrfs_set_inode_index_count(struct inode *inode) |
5884 | { | |
5885 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
5886 | struct btrfs_key key, found_key; | |
5887 | struct btrfs_path *path; | |
5888 | struct extent_buffer *leaf; | |
5889 | int ret; | |
5890 | ||
33345d01 | 5891 | key.objectid = btrfs_ino(inode); |
962a298f | 5892 | key.type = BTRFS_DIR_INDEX_KEY; |
aec7477b JB |
5893 | key.offset = (u64)-1; |
5894 | ||
5895 | path = btrfs_alloc_path(); | |
5896 | if (!path) | |
5897 | return -ENOMEM; | |
5898 | ||
5899 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); | |
5900 | if (ret < 0) | |
5901 | goto out; | |
5902 | /* FIXME: we should be able to handle this */ | |
5903 | if (ret == 0) | |
5904 | goto out; | |
5905 | ret = 0; | |
5906 | ||
5907 | /* | |
5908 | * MAGIC NUMBER EXPLANATION: | |
5909 | * since we search a directory based on f_pos we have to start at 2 | |
5910 | * since '.' and '..' have f_pos of 0 and 1 respectively, so everybody | |
5911 | * else has to start at 2 | |
5912 | */ | |
5913 | if (path->slots[0] == 0) { | |
5914 | BTRFS_I(inode)->index_cnt = 2; | |
5915 | goto out; | |
5916 | } | |
5917 | ||
5918 | path->slots[0]--; | |
5919 | ||
5920 | leaf = path->nodes[0]; | |
5921 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); | |
5922 | ||
33345d01 | 5923 | if (found_key.objectid != btrfs_ino(inode) || |
962a298f | 5924 | found_key.type != BTRFS_DIR_INDEX_KEY) { |
aec7477b JB |
5925 | BTRFS_I(inode)->index_cnt = 2; |
5926 | goto out; | |
5927 | } | |
5928 | ||
5929 | BTRFS_I(inode)->index_cnt = found_key.offset + 1; | |
5930 | out: | |
5931 | btrfs_free_path(path); | |
5932 | return ret; | |
5933 | } | |
5934 | ||
d352ac68 CM |
5935 | /* |
5936 | * helper to find a free sequence number in a given directory. This current | |
5937 | * code is very simple, later versions will do smarter things in the btree | |
5938 | */ | |
3de4586c | 5939 | int btrfs_set_inode_index(struct inode *dir, u64 *index) |
aec7477b JB |
5940 | { |
5941 | int ret = 0; | |
5942 | ||
5943 | if (BTRFS_I(dir)->index_cnt == (u64)-1) { | |
16cdcec7 MX |
5944 | ret = btrfs_inode_delayed_dir_index_count(dir); |
5945 | if (ret) { | |
5946 | ret = btrfs_set_inode_index_count(dir); | |
5947 | if (ret) | |
5948 | return ret; | |
5949 | } | |
aec7477b JB |
5950 | } |
5951 | ||
00e4e6b3 | 5952 | *index = BTRFS_I(dir)->index_cnt; |
aec7477b JB |
5953 | BTRFS_I(dir)->index_cnt++; |
5954 | ||
5955 | return ret; | |
5956 | } | |
5957 | ||
b0d5d10f CM |
5958 | static int btrfs_insert_inode_locked(struct inode *inode) |
5959 | { | |
5960 | struct btrfs_iget_args args; | |
5961 | args.location = &BTRFS_I(inode)->location; | |
5962 | args.root = BTRFS_I(inode)->root; | |
5963 | ||
5964 | return insert_inode_locked4(inode, | |
5965 | btrfs_inode_hash(inode->i_ino, BTRFS_I(inode)->root), | |
5966 | btrfs_find_actor, &args); | |
5967 | } | |
5968 | ||
39279cc3 CM |
5969 | static struct inode *btrfs_new_inode(struct btrfs_trans_handle *trans, |
5970 | struct btrfs_root *root, | |
aec7477b | 5971 | struct inode *dir, |
9c58309d | 5972 | const char *name, int name_len, |
175a4eb7 AV |
5973 | u64 ref_objectid, u64 objectid, |
5974 | umode_t mode, u64 *index) | |
39279cc3 CM |
5975 | { |
5976 | struct inode *inode; | |
5f39d397 | 5977 | struct btrfs_inode_item *inode_item; |
39279cc3 | 5978 | struct btrfs_key *location; |
5f39d397 | 5979 | struct btrfs_path *path; |
9c58309d CM |
5980 | struct btrfs_inode_ref *ref; |
5981 | struct btrfs_key key[2]; | |
5982 | u32 sizes[2]; | |
ef3b9af5 | 5983 | int nitems = name ? 2 : 1; |
9c58309d | 5984 | unsigned long ptr; |
39279cc3 | 5985 | int ret; |
39279cc3 | 5986 | |
5f39d397 | 5987 | path = btrfs_alloc_path(); |
d8926bb3 MF |
5988 | if (!path) |
5989 | return ERR_PTR(-ENOMEM); | |
5f39d397 | 5990 | |
39279cc3 | 5991 | inode = new_inode(root->fs_info->sb); |
8fb27640 YS |
5992 | if (!inode) { |
5993 | btrfs_free_path(path); | |
39279cc3 | 5994 | return ERR_PTR(-ENOMEM); |
8fb27640 | 5995 | } |
39279cc3 | 5996 | |
5762b5c9 FM |
5997 | /* |
5998 | * O_TMPFILE, set link count to 0, so that after this point, | |
5999 | * we fill in an inode item with the correct link count. | |
6000 | */ | |
6001 | if (!name) | |
6002 | set_nlink(inode, 0); | |
6003 | ||
581bb050 LZ |
6004 | /* |
6005 | * we have to initialize this early, so we can reclaim the inode | |
6006 | * number if we fail afterwards in this function. | |
6007 | */ | |
6008 | inode->i_ino = objectid; | |
6009 | ||
ef3b9af5 | 6010 | if (dir && name) { |
1abe9b8a | 6011 | trace_btrfs_inode_request(dir); |
6012 | ||
3de4586c | 6013 | ret = btrfs_set_inode_index(dir, index); |
09771430 | 6014 | if (ret) { |
8fb27640 | 6015 | btrfs_free_path(path); |
09771430 | 6016 | iput(inode); |
aec7477b | 6017 | return ERR_PTR(ret); |
09771430 | 6018 | } |
ef3b9af5 FM |
6019 | } else if (dir) { |
6020 | *index = 0; | |
aec7477b JB |
6021 | } |
6022 | /* | |
6023 | * index_cnt is ignored for everything but a dir, | |
6024 | * btrfs_get_inode_index_count has an explanation for the magic | |
6025 | * number | |
6026 | */ | |
6027 | BTRFS_I(inode)->index_cnt = 2; | |
67de1176 | 6028 | BTRFS_I(inode)->dir_index = *index; |
39279cc3 | 6029 | BTRFS_I(inode)->root = root; |
e02119d5 | 6030 | BTRFS_I(inode)->generation = trans->transid; |
76195853 | 6031 | inode->i_generation = BTRFS_I(inode)->generation; |
b888db2b | 6032 | |
5dc562c5 JB |
6033 | /* |
6034 | * We could have gotten an inode number from somebody who was fsynced | |
6035 | * and then removed in this same transaction, so let's just set full | |
6036 | * sync since it will be a full sync anyway and this will blow away the | |
6037 | * old info in the log. | |
6038 | */ | |
6039 | set_bit(BTRFS_INODE_NEEDS_FULL_SYNC, &BTRFS_I(inode)->runtime_flags); | |
6040 | ||
9c58309d | 6041 | key[0].objectid = objectid; |
962a298f | 6042 | key[0].type = BTRFS_INODE_ITEM_KEY; |
9c58309d CM |
6043 | key[0].offset = 0; |
6044 | ||
9c58309d | 6045 | sizes[0] = sizeof(struct btrfs_inode_item); |
ef3b9af5 FM |
6046 | |
6047 | if (name) { | |
6048 | /* | |
6049 | * Start new inodes with an inode_ref. This is slightly more | |
6050 | * efficient for small numbers of hard links since they will | |
6051 | * be packed into one item. Extended refs will kick in if we | |
6052 | * add more hard links than can fit in the ref item. | |
6053 | */ | |
6054 | key[1].objectid = objectid; | |
962a298f | 6055 | key[1].type = BTRFS_INODE_REF_KEY; |
ef3b9af5 FM |
6056 | key[1].offset = ref_objectid; |
6057 | ||
6058 | sizes[1] = name_len + sizeof(*ref); | |
6059 | } | |
9c58309d | 6060 | |
b0d5d10f CM |
6061 | location = &BTRFS_I(inode)->location; |
6062 | location->objectid = objectid; | |
6063 | location->offset = 0; | |
962a298f | 6064 | location->type = BTRFS_INODE_ITEM_KEY; |
b0d5d10f CM |
6065 | |
6066 | ret = btrfs_insert_inode_locked(inode); | |
6067 | if (ret < 0) | |
6068 | goto fail; | |
6069 | ||
b9473439 | 6070 | path->leave_spinning = 1; |
ef3b9af5 | 6071 | ret = btrfs_insert_empty_items(trans, root, path, key, sizes, nitems); |
9c58309d | 6072 | if (ret != 0) |
b0d5d10f | 6073 | goto fail_unlock; |
5f39d397 | 6074 | |
ecc11fab | 6075 | inode_init_owner(inode, dir, mode); |
a76a3cd4 | 6076 | inode_set_bytes(inode, 0); |
9cc97d64 | 6077 | |
6078 | inode->i_mtime = CURRENT_TIME; | |
6079 | inode->i_atime = inode->i_mtime; | |
6080 | inode->i_ctime = inode->i_mtime; | |
6081 | BTRFS_I(inode)->i_otime = inode->i_mtime; | |
6082 | ||
5f39d397 CM |
6083 | inode_item = btrfs_item_ptr(path->nodes[0], path->slots[0], |
6084 | struct btrfs_inode_item); | |
293f7e07 LZ |
6085 | memset_extent_buffer(path->nodes[0], 0, (unsigned long)inode_item, |
6086 | sizeof(*inode_item)); | |
e02119d5 | 6087 | fill_inode_item(trans, path->nodes[0], inode_item, inode); |
9c58309d | 6088 | |
ef3b9af5 FM |
6089 | if (name) { |
6090 | ref = btrfs_item_ptr(path->nodes[0], path->slots[0] + 1, | |
6091 | struct btrfs_inode_ref); | |
6092 | btrfs_set_inode_ref_name_len(path->nodes[0], ref, name_len); | |
6093 | btrfs_set_inode_ref_index(path->nodes[0], ref, *index); | |
6094 | ptr = (unsigned long)(ref + 1); | |
6095 | write_extent_buffer(path->nodes[0], name, ptr, name_len); | |
6096 | } | |
9c58309d | 6097 | |
5f39d397 CM |
6098 | btrfs_mark_buffer_dirty(path->nodes[0]); |
6099 | btrfs_free_path(path); | |
6100 | ||
6cbff00f CH |
6101 | btrfs_inherit_iflags(inode, dir); |
6102 | ||
569254b0 | 6103 | if (S_ISREG(mode)) { |
94272164 CM |
6104 | if (btrfs_test_opt(root, NODATASUM)) |
6105 | BTRFS_I(inode)->flags |= BTRFS_INODE_NODATASUM; | |
213490b3 | 6106 | if (btrfs_test_opt(root, NODATACOW)) |
f2bdf9a8 JB |
6107 | BTRFS_I(inode)->flags |= BTRFS_INODE_NODATACOW | |
6108 | BTRFS_INODE_NODATASUM; | |
94272164 CM |
6109 | } |
6110 | ||
5d4f98a2 | 6111 | inode_tree_add(inode); |
1abe9b8a | 6112 | |
6113 | trace_btrfs_inode_new(inode); | |
1973f0fa | 6114 | btrfs_set_inode_last_trans(trans, inode); |
1abe9b8a | 6115 | |
8ea05e3a AB |
6116 | btrfs_update_root_times(trans, root); |
6117 | ||
63541927 FDBM |
6118 | ret = btrfs_inode_inherit_props(trans, inode, dir); |
6119 | if (ret) | |
6120 | btrfs_err(root->fs_info, | |
6121 | "error inheriting props for ino %llu (root %llu): %d", | |
6122 | btrfs_ino(inode), root->root_key.objectid, ret); | |
6123 | ||
39279cc3 | 6124 | return inode; |
b0d5d10f CM |
6125 | |
6126 | fail_unlock: | |
6127 | unlock_new_inode(inode); | |
5f39d397 | 6128 | fail: |
ef3b9af5 | 6129 | if (dir && name) |
aec7477b | 6130 | BTRFS_I(dir)->index_cnt--; |
5f39d397 | 6131 | btrfs_free_path(path); |
09771430 | 6132 | iput(inode); |
5f39d397 | 6133 | return ERR_PTR(ret); |
39279cc3 CM |
6134 | } |
6135 | ||
6136 | static inline u8 btrfs_inode_type(struct inode *inode) | |
6137 | { | |
6138 | return btrfs_type_by_mode[(inode->i_mode & S_IFMT) >> S_SHIFT]; | |
6139 | } | |
6140 | ||
d352ac68 CM |
6141 | /* |
6142 | * utility function to add 'inode' into 'parent_inode' with | |
6143 | * a give name and a given sequence number. | |
6144 | * if 'add_backref' is true, also insert a backref from the | |
6145 | * inode to the parent directory. | |
6146 | */ | |
e02119d5 CM |
6147 | int btrfs_add_link(struct btrfs_trans_handle *trans, |
6148 | struct inode *parent_inode, struct inode *inode, | |
6149 | const char *name, int name_len, int add_backref, u64 index) | |
39279cc3 | 6150 | { |
4df27c4d | 6151 | int ret = 0; |
39279cc3 | 6152 | struct btrfs_key key; |
e02119d5 | 6153 | struct btrfs_root *root = BTRFS_I(parent_inode)->root; |
33345d01 LZ |
6154 | u64 ino = btrfs_ino(inode); |
6155 | u64 parent_ino = btrfs_ino(parent_inode); | |
5f39d397 | 6156 | |
33345d01 | 6157 | if (unlikely(ino == BTRFS_FIRST_FREE_OBJECTID)) { |
4df27c4d YZ |
6158 | memcpy(&key, &BTRFS_I(inode)->root->root_key, sizeof(key)); |
6159 | } else { | |
33345d01 | 6160 | key.objectid = ino; |
962a298f | 6161 | key.type = BTRFS_INODE_ITEM_KEY; |
4df27c4d YZ |
6162 | key.offset = 0; |
6163 | } | |
6164 | ||
33345d01 | 6165 | if (unlikely(ino == BTRFS_FIRST_FREE_OBJECTID)) { |
4df27c4d YZ |
6166 | ret = btrfs_add_root_ref(trans, root->fs_info->tree_root, |
6167 | key.objectid, root->root_key.objectid, | |
33345d01 | 6168 | parent_ino, index, name, name_len); |
4df27c4d | 6169 | } else if (add_backref) { |
33345d01 LZ |
6170 | ret = btrfs_insert_inode_ref(trans, root, name, name_len, ino, |
6171 | parent_ino, index); | |
4df27c4d | 6172 | } |
39279cc3 | 6173 | |
79787eaa JM |
6174 | /* Nothing to clean up yet */ |
6175 | if (ret) | |
6176 | return ret; | |
4df27c4d | 6177 | |
79787eaa JM |
6178 | ret = btrfs_insert_dir_item(trans, root, name, name_len, |
6179 | parent_inode, &key, | |
6180 | btrfs_inode_type(inode), index); | |
9c52057c | 6181 | if (ret == -EEXIST || ret == -EOVERFLOW) |
79787eaa JM |
6182 | goto fail_dir_item; |
6183 | else if (ret) { | |
6184 | btrfs_abort_transaction(trans, root, ret); | |
6185 | return ret; | |
39279cc3 | 6186 | } |
79787eaa JM |
6187 | |
6188 | btrfs_i_size_write(parent_inode, parent_inode->i_size + | |
6189 | name_len * 2); | |
0c4d2d95 | 6190 | inode_inc_iversion(parent_inode); |
79787eaa JM |
6191 | parent_inode->i_mtime = parent_inode->i_ctime = CURRENT_TIME; |
6192 | ret = btrfs_update_inode(trans, root, parent_inode); | |
6193 | if (ret) | |
6194 | btrfs_abort_transaction(trans, root, ret); | |
39279cc3 | 6195 | return ret; |
fe66a05a CM |
6196 | |
6197 | fail_dir_item: | |
6198 | if (unlikely(ino == BTRFS_FIRST_FREE_OBJECTID)) { | |
6199 | u64 local_index; | |
6200 | int err; | |
6201 | err = btrfs_del_root_ref(trans, root->fs_info->tree_root, | |
6202 | key.objectid, root->root_key.objectid, | |
6203 | parent_ino, &local_index, name, name_len); | |
6204 | ||
6205 | } else if (add_backref) { | |
6206 | u64 local_index; | |
6207 | int err; | |
6208 | ||
6209 | err = btrfs_del_inode_ref(trans, root, name, name_len, | |
6210 | ino, parent_ino, &local_index); | |
6211 | } | |
6212 | return ret; | |
39279cc3 CM |
6213 | } |
6214 | ||
6215 | static int btrfs_add_nondir(struct btrfs_trans_handle *trans, | |
a1b075d2 JB |
6216 | struct inode *dir, struct dentry *dentry, |
6217 | struct inode *inode, int backref, u64 index) | |
39279cc3 | 6218 | { |
a1b075d2 JB |
6219 | int err = btrfs_add_link(trans, dir, inode, |
6220 | dentry->d_name.name, dentry->d_name.len, | |
6221 | backref, index); | |
39279cc3 CM |
6222 | if (err > 0) |
6223 | err = -EEXIST; | |
6224 | return err; | |
6225 | } | |
6226 | ||
618e21d5 | 6227 | static int btrfs_mknod(struct inode *dir, struct dentry *dentry, |
1a67aafb | 6228 | umode_t mode, dev_t rdev) |
618e21d5 JB |
6229 | { |
6230 | struct btrfs_trans_handle *trans; | |
6231 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
1832a6d5 | 6232 | struct inode *inode = NULL; |
618e21d5 JB |
6233 | int err; |
6234 | int drop_inode = 0; | |
6235 | u64 objectid; | |
00e4e6b3 | 6236 | u64 index = 0; |
618e21d5 JB |
6237 | |
6238 | if (!new_valid_dev(rdev)) | |
6239 | return -EINVAL; | |
6240 | ||
9ed74f2d JB |
6241 | /* |
6242 | * 2 for inode item and ref | |
6243 | * 2 for dir items | |
6244 | * 1 for xattr if selinux is on | |
6245 | */ | |
a22285a6 YZ |
6246 | trans = btrfs_start_transaction(root, 5); |
6247 | if (IS_ERR(trans)) | |
6248 | return PTR_ERR(trans); | |
1832a6d5 | 6249 | |
581bb050 LZ |
6250 | err = btrfs_find_free_ino(root, &objectid); |
6251 | if (err) | |
6252 | goto out_unlock; | |
6253 | ||
aec7477b | 6254 | inode = btrfs_new_inode(trans, root, dir, dentry->d_name.name, |
33345d01 | 6255 | dentry->d_name.len, btrfs_ino(dir), objectid, |
d82a6f1d | 6256 | mode, &index); |
7cf96da3 TI |
6257 | if (IS_ERR(inode)) { |
6258 | err = PTR_ERR(inode); | |
618e21d5 | 6259 | goto out_unlock; |
7cf96da3 | 6260 | } |
618e21d5 | 6261 | |
ad19db71 CS |
6262 | /* |
6263 | * If the active LSM wants to access the inode during | |
6264 | * d_instantiate it needs these. Smack checks to see | |
6265 | * if the filesystem supports xattrs by looking at the | |
6266 | * ops vector. | |
6267 | */ | |
ad19db71 | 6268 | inode->i_op = &btrfs_special_inode_operations; |
b0d5d10f CM |
6269 | init_special_inode(inode, inode->i_mode, rdev); |
6270 | ||
6271 | err = btrfs_init_inode_security(trans, inode, dir, &dentry->d_name); | |
618e21d5 | 6272 | if (err) |
b0d5d10f CM |
6273 | goto out_unlock_inode; |
6274 | ||
6275 | err = btrfs_add_nondir(trans, dir, dentry, inode, 0, index); | |
6276 | if (err) { | |
6277 | goto out_unlock_inode; | |
6278 | } else { | |
1b4ab1bb | 6279 | btrfs_update_inode(trans, root, inode); |
b0d5d10f | 6280 | unlock_new_inode(inode); |
08c422c2 | 6281 | d_instantiate(dentry, inode); |
618e21d5 | 6282 | } |
b0d5d10f | 6283 | |
618e21d5 | 6284 | out_unlock: |
7ad85bb7 | 6285 | btrfs_end_transaction(trans, root); |
c581afc8 | 6286 | btrfs_balance_delayed_items(root); |
b53d3f5d | 6287 | btrfs_btree_balance_dirty(root); |
618e21d5 JB |
6288 | if (drop_inode) { |
6289 | inode_dec_link_count(inode); | |
6290 | iput(inode); | |
6291 | } | |
618e21d5 | 6292 | return err; |
b0d5d10f CM |
6293 | |
6294 | out_unlock_inode: | |
6295 | drop_inode = 1; | |
6296 | unlock_new_inode(inode); | |
6297 | goto out_unlock; | |
6298 | ||
618e21d5 JB |
6299 | } |
6300 | ||
39279cc3 | 6301 | static int btrfs_create(struct inode *dir, struct dentry *dentry, |
ebfc3b49 | 6302 | umode_t mode, bool excl) |
39279cc3 CM |
6303 | { |
6304 | struct btrfs_trans_handle *trans; | |
6305 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
1832a6d5 | 6306 | struct inode *inode = NULL; |
43baa579 | 6307 | int drop_inode_on_err = 0; |
a22285a6 | 6308 | int err; |
39279cc3 | 6309 | u64 objectid; |
00e4e6b3 | 6310 | u64 index = 0; |
39279cc3 | 6311 | |
9ed74f2d JB |
6312 | /* |
6313 | * 2 for inode item and ref | |
6314 | * 2 for dir items | |
6315 | * 1 for xattr if selinux is on | |
6316 | */ | |
a22285a6 YZ |
6317 | trans = btrfs_start_transaction(root, 5); |
6318 | if (IS_ERR(trans)) | |
6319 | return PTR_ERR(trans); | |
9ed74f2d | 6320 | |
581bb050 LZ |
6321 | err = btrfs_find_free_ino(root, &objectid); |
6322 | if (err) | |
6323 | goto out_unlock; | |
6324 | ||
aec7477b | 6325 | inode = btrfs_new_inode(trans, root, dir, dentry->d_name.name, |
33345d01 | 6326 | dentry->d_name.len, btrfs_ino(dir), objectid, |
d82a6f1d | 6327 | mode, &index); |
7cf96da3 TI |
6328 | if (IS_ERR(inode)) { |
6329 | err = PTR_ERR(inode); | |
39279cc3 | 6330 | goto out_unlock; |
7cf96da3 | 6331 | } |
43baa579 | 6332 | drop_inode_on_err = 1; |
ad19db71 CS |
6333 | /* |
6334 | * If the active LSM wants to access the inode during | |
6335 | * d_instantiate it needs these. Smack checks to see | |
6336 | * if the filesystem supports xattrs by looking at the | |
6337 | * ops vector. | |
6338 | */ | |
6339 | inode->i_fop = &btrfs_file_operations; | |
6340 | inode->i_op = &btrfs_file_inode_operations; | |
b0d5d10f | 6341 | inode->i_mapping->a_ops = &btrfs_aops; |
b0d5d10f CM |
6342 | |
6343 | err = btrfs_init_inode_security(trans, inode, dir, &dentry->d_name); | |
6344 | if (err) | |
6345 | goto out_unlock_inode; | |
6346 | ||
6347 | err = btrfs_update_inode(trans, root, inode); | |
6348 | if (err) | |
6349 | goto out_unlock_inode; | |
ad19db71 | 6350 | |
a1b075d2 | 6351 | err = btrfs_add_nondir(trans, dir, dentry, inode, 0, index); |
39279cc3 | 6352 | if (err) |
b0d5d10f | 6353 | goto out_unlock_inode; |
43baa579 | 6354 | |
43baa579 | 6355 | BTRFS_I(inode)->io_tree.ops = &btrfs_extent_io_ops; |
b0d5d10f | 6356 | unlock_new_inode(inode); |
43baa579 FB |
6357 | d_instantiate(dentry, inode); |
6358 | ||
39279cc3 | 6359 | out_unlock: |
7ad85bb7 | 6360 | btrfs_end_transaction(trans, root); |
43baa579 | 6361 | if (err && drop_inode_on_err) { |
39279cc3 CM |
6362 | inode_dec_link_count(inode); |
6363 | iput(inode); | |
6364 | } | |
c581afc8 | 6365 | btrfs_balance_delayed_items(root); |
b53d3f5d | 6366 | btrfs_btree_balance_dirty(root); |
39279cc3 | 6367 | return err; |
b0d5d10f CM |
6368 | |
6369 | out_unlock_inode: | |
6370 | unlock_new_inode(inode); | |
6371 | goto out_unlock; | |
6372 | ||
39279cc3 CM |
6373 | } |
6374 | ||
6375 | static int btrfs_link(struct dentry *old_dentry, struct inode *dir, | |
6376 | struct dentry *dentry) | |
6377 | { | |
6378 | struct btrfs_trans_handle *trans; | |
6379 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
2b0143b5 | 6380 | struct inode *inode = d_inode(old_dentry); |
00e4e6b3 | 6381 | u64 index; |
39279cc3 CM |
6382 | int err; |
6383 | int drop_inode = 0; | |
6384 | ||
4a8be425 TH |
6385 | /* do not allow sys_link's with other subvols of the same device */ |
6386 | if (root->objectid != BTRFS_I(inode)->root->objectid) | |
3ab3564f | 6387 | return -EXDEV; |
4a8be425 | 6388 | |
f186373f | 6389 | if (inode->i_nlink >= BTRFS_LINK_MAX) |
c055e99e | 6390 | return -EMLINK; |
4a8be425 | 6391 | |
3de4586c | 6392 | err = btrfs_set_inode_index(dir, &index); |
aec7477b JB |
6393 | if (err) |
6394 | goto fail; | |
6395 | ||
a22285a6 | 6396 | /* |
7e6b6465 | 6397 | * 2 items for inode and inode ref |
a22285a6 | 6398 | * 2 items for dir items |
7e6b6465 | 6399 | * 1 item for parent inode |
a22285a6 | 6400 | */ |
7e6b6465 | 6401 | trans = btrfs_start_transaction(root, 5); |
a22285a6 YZ |
6402 | if (IS_ERR(trans)) { |
6403 | err = PTR_ERR(trans); | |
6404 | goto fail; | |
6405 | } | |
5f39d397 | 6406 | |
67de1176 MX |
6407 | /* There are several dir indexes for this inode, clear the cache. */ |
6408 | BTRFS_I(inode)->dir_index = 0ULL; | |
8b558c5f | 6409 | inc_nlink(inode); |
0c4d2d95 | 6410 | inode_inc_iversion(inode); |
3153495d | 6411 | inode->i_ctime = CURRENT_TIME; |
7de9c6ee | 6412 | ihold(inode); |
e9976151 | 6413 | set_bit(BTRFS_INODE_COPY_EVERYTHING, &BTRFS_I(inode)->runtime_flags); |
aec7477b | 6414 | |
a1b075d2 | 6415 | err = btrfs_add_nondir(trans, dir, dentry, inode, 1, index); |
5f39d397 | 6416 | |
a5719521 | 6417 | if (err) { |
54aa1f4d | 6418 | drop_inode = 1; |
a5719521 | 6419 | } else { |
10d9f309 | 6420 | struct dentry *parent = dentry->d_parent; |
a5719521 | 6421 | err = btrfs_update_inode(trans, root, inode); |
79787eaa JM |
6422 | if (err) |
6423 | goto fail; | |
ef3b9af5 FM |
6424 | if (inode->i_nlink == 1) { |
6425 | /* | |
6426 | * If new hard link count is 1, it's a file created | |
6427 | * with open(2) O_TMPFILE flag. | |
6428 | */ | |
6429 | err = btrfs_orphan_del(trans, inode); | |
6430 | if (err) | |
6431 | goto fail; | |
6432 | } | |
08c422c2 | 6433 | d_instantiate(dentry, inode); |
6a912213 | 6434 | btrfs_log_new_name(trans, inode, NULL, parent); |
a5719521 | 6435 | } |
39279cc3 | 6436 | |
7ad85bb7 | 6437 | btrfs_end_transaction(trans, root); |
c581afc8 | 6438 | btrfs_balance_delayed_items(root); |
1832a6d5 | 6439 | fail: |
39279cc3 CM |
6440 | if (drop_inode) { |
6441 | inode_dec_link_count(inode); | |
6442 | iput(inode); | |
6443 | } | |
b53d3f5d | 6444 | btrfs_btree_balance_dirty(root); |
39279cc3 CM |
6445 | return err; |
6446 | } | |
6447 | ||
18bb1db3 | 6448 | static int btrfs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) |
39279cc3 | 6449 | { |
b9d86667 | 6450 | struct inode *inode = NULL; |
39279cc3 CM |
6451 | struct btrfs_trans_handle *trans; |
6452 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
6453 | int err = 0; | |
6454 | int drop_on_err = 0; | |
b9d86667 | 6455 | u64 objectid = 0; |
00e4e6b3 | 6456 | u64 index = 0; |
39279cc3 | 6457 | |
9ed74f2d JB |
6458 | /* |
6459 | * 2 items for inode and ref | |
6460 | * 2 items for dir items | |
6461 | * 1 for xattr if selinux is on | |
6462 | */ | |
a22285a6 YZ |
6463 | trans = btrfs_start_transaction(root, 5); |
6464 | if (IS_ERR(trans)) | |
6465 | return PTR_ERR(trans); | |
39279cc3 | 6466 | |
581bb050 LZ |
6467 | err = btrfs_find_free_ino(root, &objectid); |
6468 | if (err) | |
6469 | goto out_fail; | |
6470 | ||
aec7477b | 6471 | inode = btrfs_new_inode(trans, root, dir, dentry->d_name.name, |
33345d01 | 6472 | dentry->d_name.len, btrfs_ino(dir), objectid, |
d82a6f1d | 6473 | S_IFDIR | mode, &index); |
39279cc3 CM |
6474 | if (IS_ERR(inode)) { |
6475 | err = PTR_ERR(inode); | |
6476 | goto out_fail; | |
6477 | } | |
5f39d397 | 6478 | |
39279cc3 | 6479 | drop_on_err = 1; |
b0d5d10f CM |
6480 | /* these must be set before we unlock the inode */ |
6481 | inode->i_op = &btrfs_dir_inode_operations; | |
6482 | inode->i_fop = &btrfs_dir_file_operations; | |
33268eaf | 6483 | |
2a7dba39 | 6484 | err = btrfs_init_inode_security(trans, inode, dir, &dentry->d_name); |
33268eaf | 6485 | if (err) |
b0d5d10f | 6486 | goto out_fail_inode; |
39279cc3 | 6487 | |
dbe674a9 | 6488 | btrfs_i_size_write(inode, 0); |
39279cc3 CM |
6489 | err = btrfs_update_inode(trans, root, inode); |
6490 | if (err) | |
b0d5d10f | 6491 | goto out_fail_inode; |
5f39d397 | 6492 | |
a1b075d2 JB |
6493 | err = btrfs_add_link(trans, dir, inode, dentry->d_name.name, |
6494 | dentry->d_name.len, 0, index); | |
39279cc3 | 6495 | if (err) |
b0d5d10f | 6496 | goto out_fail_inode; |
5f39d397 | 6497 | |
39279cc3 | 6498 | d_instantiate(dentry, inode); |
b0d5d10f CM |
6499 | /* |
6500 | * mkdir is special. We're unlocking after we call d_instantiate | |
6501 | * to avoid a race with nfsd calling d_instantiate. | |
6502 | */ | |
6503 | unlock_new_inode(inode); | |
39279cc3 | 6504 | drop_on_err = 0; |
39279cc3 CM |
6505 | |
6506 | out_fail: | |
7ad85bb7 | 6507 | btrfs_end_transaction(trans, root); |
c7cfb8a5 WS |
6508 | if (drop_on_err) { |
6509 | inode_dec_link_count(inode); | |
39279cc3 | 6510 | iput(inode); |
c7cfb8a5 | 6511 | } |
c581afc8 | 6512 | btrfs_balance_delayed_items(root); |
b53d3f5d | 6513 | btrfs_btree_balance_dirty(root); |
39279cc3 | 6514 | return err; |
b0d5d10f CM |
6515 | |
6516 | out_fail_inode: | |
6517 | unlock_new_inode(inode); | |
6518 | goto out_fail; | |
39279cc3 CM |
6519 | } |
6520 | ||
e6c4efd8 QW |
6521 | /* Find next extent map of a given extent map, caller needs to ensure locks */ |
6522 | static struct extent_map *next_extent_map(struct extent_map *em) | |
6523 | { | |
6524 | struct rb_node *next; | |
6525 | ||
6526 | next = rb_next(&em->rb_node); | |
6527 | if (!next) | |
6528 | return NULL; | |
6529 | return container_of(next, struct extent_map, rb_node); | |
6530 | } | |
6531 | ||
6532 | static struct extent_map *prev_extent_map(struct extent_map *em) | |
6533 | { | |
6534 | struct rb_node *prev; | |
6535 | ||
6536 | prev = rb_prev(&em->rb_node); | |
6537 | if (!prev) | |
6538 | return NULL; | |
6539 | return container_of(prev, struct extent_map, rb_node); | |
6540 | } | |
6541 | ||
d352ac68 | 6542 | /* helper for btfs_get_extent. Given an existing extent in the tree, |
e6c4efd8 | 6543 | * the existing extent is the nearest extent to map_start, |
d352ac68 | 6544 | * and an extent that you want to insert, deal with overlap and insert |
e6c4efd8 | 6545 | * the best fitted new extent into the tree. |
d352ac68 | 6546 | */ |
3b951516 CM |
6547 | static int merge_extent_mapping(struct extent_map_tree *em_tree, |
6548 | struct extent_map *existing, | |
e6dcd2dc | 6549 | struct extent_map *em, |
51f395ad | 6550 | u64 map_start) |
3b951516 | 6551 | { |
e6c4efd8 QW |
6552 | struct extent_map *prev; |
6553 | struct extent_map *next; | |
6554 | u64 start; | |
6555 | u64 end; | |
3b951516 | 6556 | u64 start_diff; |
3b951516 | 6557 | |
e6dcd2dc | 6558 | BUG_ON(map_start < em->start || map_start >= extent_map_end(em)); |
e6c4efd8 QW |
6559 | |
6560 | if (existing->start > map_start) { | |
6561 | next = existing; | |
6562 | prev = prev_extent_map(next); | |
6563 | } else { | |
6564 | prev = existing; | |
6565 | next = next_extent_map(prev); | |
6566 | } | |
6567 | ||
6568 | start = prev ? extent_map_end(prev) : em->start; | |
6569 | start = max_t(u64, start, em->start); | |
6570 | end = next ? next->start : extent_map_end(em); | |
6571 | end = min_t(u64, end, extent_map_end(em)); | |
6572 | start_diff = start - em->start; | |
6573 | em->start = start; | |
6574 | em->len = end - start; | |
c8b97818 CM |
6575 | if (em->block_start < EXTENT_MAP_LAST_BYTE && |
6576 | !test_bit(EXTENT_FLAG_COMPRESSED, &em->flags)) { | |
e6dcd2dc | 6577 | em->block_start += start_diff; |
c8b97818 CM |
6578 | em->block_len -= start_diff; |
6579 | } | |
09a2a8f9 | 6580 | return add_extent_mapping(em_tree, em, 0); |
3b951516 CM |
6581 | } |
6582 | ||
c8b97818 CM |
6583 | static noinline int uncompress_inline(struct btrfs_path *path, |
6584 | struct inode *inode, struct page *page, | |
6585 | size_t pg_offset, u64 extent_offset, | |
6586 | struct btrfs_file_extent_item *item) | |
6587 | { | |
6588 | int ret; | |
6589 | struct extent_buffer *leaf = path->nodes[0]; | |
6590 | char *tmp; | |
6591 | size_t max_size; | |
6592 | unsigned long inline_size; | |
6593 | unsigned long ptr; | |
261507a0 | 6594 | int compress_type; |
c8b97818 CM |
6595 | |
6596 | WARN_ON(pg_offset != 0); | |
261507a0 | 6597 | compress_type = btrfs_file_extent_compression(leaf, item); |
c8b97818 CM |
6598 | max_size = btrfs_file_extent_ram_bytes(leaf, item); |
6599 | inline_size = btrfs_file_extent_inline_item_len(leaf, | |
dd3cc16b | 6600 | btrfs_item_nr(path->slots[0])); |
c8b97818 | 6601 | tmp = kmalloc(inline_size, GFP_NOFS); |
8d413713 TI |
6602 | if (!tmp) |
6603 | return -ENOMEM; | |
c8b97818 CM |
6604 | ptr = btrfs_file_extent_inline_start(item); |
6605 | ||
6606 | read_extent_buffer(leaf, tmp, ptr, inline_size); | |
6607 | ||
5b050f04 | 6608 | max_size = min_t(unsigned long, PAGE_CACHE_SIZE, max_size); |
261507a0 LZ |
6609 | ret = btrfs_decompress(compress_type, tmp, page, |
6610 | extent_offset, inline_size, max_size); | |
c8b97818 | 6611 | kfree(tmp); |
166ae5a4 | 6612 | return ret; |
c8b97818 CM |
6613 | } |
6614 | ||
d352ac68 CM |
6615 | /* |
6616 | * a bit scary, this does extent mapping from logical file offset to the disk. | |
d397712b CM |
6617 | * the ugly parts come from merging extents from the disk with the in-ram |
6618 | * representation. This gets more complex because of the data=ordered code, | |
d352ac68 CM |
6619 | * where the in-ram extents might be locked pending data=ordered completion. |
6620 | * | |
6621 | * This also copies inline extents directly into the page. | |
6622 | */ | |
d397712b | 6623 | |
a52d9a80 | 6624 | struct extent_map *btrfs_get_extent(struct inode *inode, struct page *page, |
70dec807 | 6625 | size_t pg_offset, u64 start, u64 len, |
a52d9a80 CM |
6626 | int create) |
6627 | { | |
6628 | int ret; | |
6629 | int err = 0; | |
a52d9a80 CM |
6630 | u64 extent_start = 0; |
6631 | u64 extent_end = 0; | |
33345d01 | 6632 | u64 objectid = btrfs_ino(inode); |
a52d9a80 | 6633 | u32 found_type; |
f421950f | 6634 | struct btrfs_path *path = NULL; |
a52d9a80 CM |
6635 | struct btrfs_root *root = BTRFS_I(inode)->root; |
6636 | struct btrfs_file_extent_item *item; | |
5f39d397 CM |
6637 | struct extent_buffer *leaf; |
6638 | struct btrfs_key found_key; | |
a52d9a80 CM |
6639 | struct extent_map *em = NULL; |
6640 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; | |
d1310b2e | 6641 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; |
a52d9a80 | 6642 | struct btrfs_trans_handle *trans = NULL; |
7ffbb598 | 6643 | const bool new_inline = !page || create; |
a52d9a80 | 6644 | |
a52d9a80 | 6645 | again: |
890871be | 6646 | read_lock(&em_tree->lock); |
d1310b2e | 6647 | em = lookup_extent_mapping(em_tree, start, len); |
a061fc8d CM |
6648 | if (em) |
6649 | em->bdev = root->fs_info->fs_devices->latest_bdev; | |
890871be | 6650 | read_unlock(&em_tree->lock); |
d1310b2e | 6651 | |
a52d9a80 | 6652 | if (em) { |
e1c4b745 CM |
6653 | if (em->start > start || em->start + em->len <= start) |
6654 | free_extent_map(em); | |
6655 | else if (em->block_start == EXTENT_MAP_INLINE && page) | |
70dec807 CM |
6656 | free_extent_map(em); |
6657 | else | |
6658 | goto out; | |
a52d9a80 | 6659 | } |
172ddd60 | 6660 | em = alloc_extent_map(); |
a52d9a80 | 6661 | if (!em) { |
d1310b2e CM |
6662 | err = -ENOMEM; |
6663 | goto out; | |
a52d9a80 | 6664 | } |
e6dcd2dc | 6665 | em->bdev = root->fs_info->fs_devices->latest_bdev; |
d1310b2e | 6666 | em->start = EXTENT_MAP_HOLE; |
445a6944 | 6667 | em->orig_start = EXTENT_MAP_HOLE; |
d1310b2e | 6668 | em->len = (u64)-1; |
c8b97818 | 6669 | em->block_len = (u64)-1; |
f421950f CM |
6670 | |
6671 | if (!path) { | |
6672 | path = btrfs_alloc_path(); | |
026fd317 JB |
6673 | if (!path) { |
6674 | err = -ENOMEM; | |
6675 | goto out; | |
6676 | } | |
6677 | /* | |
6678 | * Chances are we'll be called again, so go ahead and do | |
6679 | * readahead | |
6680 | */ | |
6681 | path->reada = 1; | |
f421950f CM |
6682 | } |
6683 | ||
179e29e4 CM |
6684 | ret = btrfs_lookup_file_extent(trans, root, path, |
6685 | objectid, start, trans != NULL); | |
a52d9a80 CM |
6686 | if (ret < 0) { |
6687 | err = ret; | |
6688 | goto out; | |
6689 | } | |
6690 | ||
6691 | if (ret != 0) { | |
6692 | if (path->slots[0] == 0) | |
6693 | goto not_found; | |
6694 | path->slots[0]--; | |
6695 | } | |
6696 | ||
5f39d397 CM |
6697 | leaf = path->nodes[0]; |
6698 | item = btrfs_item_ptr(leaf, path->slots[0], | |
a52d9a80 | 6699 | struct btrfs_file_extent_item); |
a52d9a80 | 6700 | /* are we inside the extent that was found? */ |
5f39d397 | 6701 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); |
962a298f | 6702 | found_type = found_key.type; |
5f39d397 | 6703 | if (found_key.objectid != objectid || |
a52d9a80 | 6704 | found_type != BTRFS_EXTENT_DATA_KEY) { |
25a50341 JB |
6705 | /* |
6706 | * If we backup past the first extent we want to move forward | |
6707 | * and see if there is an extent in front of us, otherwise we'll | |
6708 | * say there is a hole for our whole search range which can | |
6709 | * cause problems. | |
6710 | */ | |
6711 | extent_end = start; | |
6712 | goto next; | |
a52d9a80 CM |
6713 | } |
6714 | ||
5f39d397 CM |
6715 | found_type = btrfs_file_extent_type(leaf, item); |
6716 | extent_start = found_key.offset; | |
d899e052 YZ |
6717 | if (found_type == BTRFS_FILE_EXTENT_REG || |
6718 | found_type == BTRFS_FILE_EXTENT_PREALLOC) { | |
a52d9a80 | 6719 | extent_end = extent_start + |
db94535d | 6720 | btrfs_file_extent_num_bytes(leaf, item); |
9036c102 YZ |
6721 | } else if (found_type == BTRFS_FILE_EXTENT_INLINE) { |
6722 | size_t size; | |
514ac8ad | 6723 | size = btrfs_file_extent_inline_len(leaf, path->slots[0], item); |
fda2832f | 6724 | extent_end = ALIGN(extent_start + size, root->sectorsize); |
9036c102 | 6725 | } |
25a50341 | 6726 | next: |
9036c102 YZ |
6727 | if (start >= extent_end) { |
6728 | path->slots[0]++; | |
6729 | if (path->slots[0] >= btrfs_header_nritems(leaf)) { | |
6730 | ret = btrfs_next_leaf(root, path); | |
6731 | if (ret < 0) { | |
6732 | err = ret; | |
6733 | goto out; | |
a52d9a80 | 6734 | } |
9036c102 YZ |
6735 | if (ret > 0) |
6736 | goto not_found; | |
6737 | leaf = path->nodes[0]; | |
a52d9a80 | 6738 | } |
9036c102 YZ |
6739 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); |
6740 | if (found_key.objectid != objectid || | |
6741 | found_key.type != BTRFS_EXTENT_DATA_KEY) | |
6742 | goto not_found; | |
6743 | if (start + len <= found_key.offset) | |
6744 | goto not_found; | |
e2eca69d WS |
6745 | if (start > found_key.offset) |
6746 | goto next; | |
9036c102 | 6747 | em->start = start; |
70c8a91c | 6748 | em->orig_start = start; |
9036c102 YZ |
6749 | em->len = found_key.offset - start; |
6750 | goto not_found_em; | |
6751 | } | |
6752 | ||
7ffbb598 FM |
6753 | btrfs_extent_item_to_extent_map(inode, path, item, new_inline, em); |
6754 | ||
d899e052 YZ |
6755 | if (found_type == BTRFS_FILE_EXTENT_REG || |
6756 | found_type == BTRFS_FILE_EXTENT_PREALLOC) { | |
a52d9a80 CM |
6757 | goto insert; |
6758 | } else if (found_type == BTRFS_FILE_EXTENT_INLINE) { | |
5f39d397 | 6759 | unsigned long ptr; |
a52d9a80 | 6760 | char *map; |
3326d1b0 CM |
6761 | size_t size; |
6762 | size_t extent_offset; | |
6763 | size_t copy_size; | |
a52d9a80 | 6764 | |
7ffbb598 | 6765 | if (new_inline) |
689f9346 | 6766 | goto out; |
5f39d397 | 6767 | |
514ac8ad | 6768 | size = btrfs_file_extent_inline_len(leaf, path->slots[0], item); |
9036c102 | 6769 | extent_offset = page_offset(page) + pg_offset - extent_start; |
70dec807 | 6770 | copy_size = min_t(u64, PAGE_CACHE_SIZE - pg_offset, |
3326d1b0 | 6771 | size - extent_offset); |
3326d1b0 | 6772 | em->start = extent_start + extent_offset; |
fda2832f | 6773 | em->len = ALIGN(copy_size, root->sectorsize); |
b4939680 | 6774 | em->orig_block_len = em->len; |
70c8a91c | 6775 | em->orig_start = em->start; |
689f9346 | 6776 | ptr = btrfs_file_extent_inline_start(item) + extent_offset; |
179e29e4 | 6777 | if (create == 0 && !PageUptodate(page)) { |
261507a0 LZ |
6778 | if (btrfs_file_extent_compression(leaf, item) != |
6779 | BTRFS_COMPRESS_NONE) { | |
c8b97818 CM |
6780 | ret = uncompress_inline(path, inode, page, |
6781 | pg_offset, | |
6782 | extent_offset, item); | |
166ae5a4 ZB |
6783 | if (ret) { |
6784 | err = ret; | |
6785 | goto out; | |
6786 | } | |
c8b97818 CM |
6787 | } else { |
6788 | map = kmap(page); | |
6789 | read_extent_buffer(leaf, map + pg_offset, ptr, | |
6790 | copy_size); | |
93c82d57 CM |
6791 | if (pg_offset + copy_size < PAGE_CACHE_SIZE) { |
6792 | memset(map + pg_offset + copy_size, 0, | |
6793 | PAGE_CACHE_SIZE - pg_offset - | |
6794 | copy_size); | |
6795 | } | |
c8b97818 CM |
6796 | kunmap(page); |
6797 | } | |
179e29e4 CM |
6798 | flush_dcache_page(page); |
6799 | } else if (create && PageUptodate(page)) { | |
6bf7e080 | 6800 | BUG(); |
179e29e4 CM |
6801 | if (!trans) { |
6802 | kunmap(page); | |
6803 | free_extent_map(em); | |
6804 | em = NULL; | |
ff5714cc | 6805 | |
b3b4aa74 | 6806 | btrfs_release_path(path); |
7a7eaa40 | 6807 | trans = btrfs_join_transaction(root); |
ff5714cc | 6808 | |
3612b495 TI |
6809 | if (IS_ERR(trans)) |
6810 | return ERR_CAST(trans); | |
179e29e4 CM |
6811 | goto again; |
6812 | } | |
c8b97818 | 6813 | map = kmap(page); |
70dec807 | 6814 | write_extent_buffer(leaf, map + pg_offset, ptr, |
179e29e4 | 6815 | copy_size); |
c8b97818 | 6816 | kunmap(page); |
179e29e4 | 6817 | btrfs_mark_buffer_dirty(leaf); |
a52d9a80 | 6818 | } |
d1310b2e | 6819 | set_extent_uptodate(io_tree, em->start, |
507903b8 | 6820 | extent_map_end(em) - 1, NULL, GFP_NOFS); |
a52d9a80 | 6821 | goto insert; |
a52d9a80 CM |
6822 | } |
6823 | not_found: | |
6824 | em->start = start; | |
70c8a91c | 6825 | em->orig_start = start; |
d1310b2e | 6826 | em->len = len; |
a52d9a80 | 6827 | not_found_em: |
5f39d397 | 6828 | em->block_start = EXTENT_MAP_HOLE; |
9036c102 | 6829 | set_bit(EXTENT_FLAG_VACANCY, &em->flags); |
a52d9a80 | 6830 | insert: |
b3b4aa74 | 6831 | btrfs_release_path(path); |
d1310b2e | 6832 | if (em->start > start || extent_map_end(em) <= start) { |
c2cf52eb | 6833 | btrfs_err(root->fs_info, "bad extent! em: [%llu %llu] passed [%llu %llu]", |
c1c9ff7c | 6834 | em->start, em->len, start, len); |
a52d9a80 CM |
6835 | err = -EIO; |
6836 | goto out; | |
6837 | } | |
d1310b2e CM |
6838 | |
6839 | err = 0; | |
890871be | 6840 | write_lock(&em_tree->lock); |
09a2a8f9 | 6841 | ret = add_extent_mapping(em_tree, em, 0); |
3b951516 CM |
6842 | /* it is possible that someone inserted the extent into the tree |
6843 | * while we had the lock dropped. It is also possible that | |
6844 | * an overlapping map exists in the tree | |
6845 | */ | |
a52d9a80 | 6846 | if (ret == -EEXIST) { |
3b951516 | 6847 | struct extent_map *existing; |
e6dcd2dc CM |
6848 | |
6849 | ret = 0; | |
6850 | ||
e6c4efd8 QW |
6851 | existing = search_extent_mapping(em_tree, start, len); |
6852 | /* | |
6853 | * existing will always be non-NULL, since there must be | |
6854 | * extent causing the -EEXIST. | |
6855 | */ | |
6856 | if (start >= extent_map_end(existing) || | |
32be3a1a | 6857 | start <= existing->start) { |
e6c4efd8 QW |
6858 | /* |
6859 | * The existing extent map is the one nearest to | |
6860 | * the [start, start + len) range which overlaps | |
6861 | */ | |
6862 | err = merge_extent_mapping(em_tree, existing, | |
6863 | em, start); | |
e1c4b745 | 6864 | free_extent_map(existing); |
e6c4efd8 | 6865 | if (err) { |
3b951516 CM |
6866 | free_extent_map(em); |
6867 | em = NULL; | |
6868 | } | |
6869 | } else { | |
6870 | free_extent_map(em); | |
6871 | em = existing; | |
e6dcd2dc | 6872 | err = 0; |
a52d9a80 | 6873 | } |
a52d9a80 | 6874 | } |
890871be | 6875 | write_unlock(&em_tree->lock); |
a52d9a80 | 6876 | out: |
1abe9b8a | 6877 | |
4cd8587c | 6878 | trace_btrfs_get_extent(root, em); |
1abe9b8a | 6879 | |
f421950f CM |
6880 | if (path) |
6881 | btrfs_free_path(path); | |
a52d9a80 CM |
6882 | if (trans) { |
6883 | ret = btrfs_end_transaction(trans, root); | |
d397712b | 6884 | if (!err) |
a52d9a80 CM |
6885 | err = ret; |
6886 | } | |
a52d9a80 CM |
6887 | if (err) { |
6888 | free_extent_map(em); | |
a52d9a80 CM |
6889 | return ERR_PTR(err); |
6890 | } | |
79787eaa | 6891 | BUG_ON(!em); /* Error is always set */ |
a52d9a80 CM |
6892 | return em; |
6893 | } | |
6894 | ||
ec29ed5b CM |
6895 | struct extent_map *btrfs_get_extent_fiemap(struct inode *inode, struct page *page, |
6896 | size_t pg_offset, u64 start, u64 len, | |
6897 | int create) | |
6898 | { | |
6899 | struct extent_map *em; | |
6900 | struct extent_map *hole_em = NULL; | |
6901 | u64 range_start = start; | |
6902 | u64 end; | |
6903 | u64 found; | |
6904 | u64 found_end; | |
6905 | int err = 0; | |
6906 | ||
6907 | em = btrfs_get_extent(inode, page, pg_offset, start, len, create); | |
6908 | if (IS_ERR(em)) | |
6909 | return em; | |
6910 | if (em) { | |
6911 | /* | |
f9e4fb53 LB |
6912 | * if our em maps to |
6913 | * - a hole or | |
6914 | * - a pre-alloc extent, | |
6915 | * there might actually be delalloc bytes behind it. | |
ec29ed5b | 6916 | */ |
f9e4fb53 LB |
6917 | if (em->block_start != EXTENT_MAP_HOLE && |
6918 | !test_bit(EXTENT_FLAG_PREALLOC, &em->flags)) | |
ec29ed5b CM |
6919 | return em; |
6920 | else | |
6921 | hole_em = em; | |
6922 | } | |
6923 | ||
6924 | /* check to see if we've wrapped (len == -1 or similar) */ | |
6925 | end = start + len; | |
6926 | if (end < start) | |
6927 | end = (u64)-1; | |
6928 | else | |
6929 | end -= 1; | |
6930 | ||
6931 | em = NULL; | |
6932 | ||
6933 | /* ok, we didn't find anything, lets look for delalloc */ | |
6934 | found = count_range_bits(&BTRFS_I(inode)->io_tree, &range_start, | |
6935 | end, len, EXTENT_DELALLOC, 1); | |
6936 | found_end = range_start + found; | |
6937 | if (found_end < range_start) | |
6938 | found_end = (u64)-1; | |
6939 | ||
6940 | /* | |
6941 | * we didn't find anything useful, return | |
6942 | * the original results from get_extent() | |
6943 | */ | |
6944 | if (range_start > end || found_end <= start) { | |
6945 | em = hole_em; | |
6946 | hole_em = NULL; | |
6947 | goto out; | |
6948 | } | |
6949 | ||
6950 | /* adjust the range_start to make sure it doesn't | |
6951 | * go backwards from the start they passed in | |
6952 | */ | |
67871254 | 6953 | range_start = max(start, range_start); |
ec29ed5b CM |
6954 | found = found_end - range_start; |
6955 | ||
6956 | if (found > 0) { | |
6957 | u64 hole_start = start; | |
6958 | u64 hole_len = len; | |
6959 | ||
172ddd60 | 6960 | em = alloc_extent_map(); |
ec29ed5b CM |
6961 | if (!em) { |
6962 | err = -ENOMEM; | |
6963 | goto out; | |
6964 | } | |
6965 | /* | |
6966 | * when btrfs_get_extent can't find anything it | |
6967 | * returns one huge hole | |
6968 | * | |
6969 | * make sure what it found really fits our range, and | |
6970 | * adjust to make sure it is based on the start from | |
6971 | * the caller | |
6972 | */ | |
6973 | if (hole_em) { | |
6974 | u64 calc_end = extent_map_end(hole_em); | |
6975 | ||
6976 | if (calc_end <= start || (hole_em->start > end)) { | |
6977 | free_extent_map(hole_em); | |
6978 | hole_em = NULL; | |
6979 | } else { | |
6980 | hole_start = max(hole_em->start, start); | |
6981 | hole_len = calc_end - hole_start; | |
6982 | } | |
6983 | } | |
6984 | em->bdev = NULL; | |
6985 | if (hole_em && range_start > hole_start) { | |
6986 | /* our hole starts before our delalloc, so we | |
6987 | * have to return just the parts of the hole | |
6988 | * that go until the delalloc starts | |
6989 | */ | |
6990 | em->len = min(hole_len, | |
6991 | range_start - hole_start); | |
6992 | em->start = hole_start; | |
6993 | em->orig_start = hole_start; | |
6994 | /* | |
6995 | * don't adjust block start at all, | |
6996 | * it is fixed at EXTENT_MAP_HOLE | |
6997 | */ | |
6998 | em->block_start = hole_em->block_start; | |
6999 | em->block_len = hole_len; | |
f9e4fb53 LB |
7000 | if (test_bit(EXTENT_FLAG_PREALLOC, &hole_em->flags)) |
7001 | set_bit(EXTENT_FLAG_PREALLOC, &em->flags); | |
ec29ed5b CM |
7002 | } else { |
7003 | em->start = range_start; | |
7004 | em->len = found; | |
7005 | em->orig_start = range_start; | |
7006 | em->block_start = EXTENT_MAP_DELALLOC; | |
7007 | em->block_len = found; | |
7008 | } | |
7009 | } else if (hole_em) { | |
7010 | return hole_em; | |
7011 | } | |
7012 | out: | |
7013 | ||
7014 | free_extent_map(hole_em); | |
7015 | if (err) { | |
7016 | free_extent_map(em); | |
7017 | return ERR_PTR(err); | |
7018 | } | |
7019 | return em; | |
7020 | } | |
7021 | ||
4b46fce2 JB |
7022 | static struct extent_map *btrfs_new_extent_direct(struct inode *inode, |
7023 | u64 start, u64 len) | |
7024 | { | |
7025 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
70c8a91c | 7026 | struct extent_map *em; |
4b46fce2 JB |
7027 | struct btrfs_key ins; |
7028 | u64 alloc_hint; | |
7029 | int ret; | |
4b46fce2 | 7030 | |
4b46fce2 | 7031 | alloc_hint = get_extent_allocation_hint(inode, start, len); |
00361589 | 7032 | ret = btrfs_reserve_extent(root, len, root->sectorsize, 0, |
e570fd27 | 7033 | alloc_hint, &ins, 1, 1); |
00361589 JB |
7034 | if (ret) |
7035 | return ERR_PTR(ret); | |
4b46fce2 | 7036 | |
70c8a91c | 7037 | em = create_pinned_em(inode, start, ins.offset, start, ins.objectid, |
cc95bef6 | 7038 | ins.offset, ins.offset, ins.offset, 0); |
00361589 | 7039 | if (IS_ERR(em)) { |
e570fd27 | 7040 | btrfs_free_reserved_extent(root, ins.objectid, ins.offset, 1); |
00361589 JB |
7041 | return em; |
7042 | } | |
4b46fce2 JB |
7043 | |
7044 | ret = btrfs_add_ordered_extent_dio(inode, start, ins.objectid, | |
7045 | ins.offset, ins.offset, 0); | |
7046 | if (ret) { | |
e570fd27 | 7047 | btrfs_free_reserved_extent(root, ins.objectid, ins.offset, 1); |
00361589 JB |
7048 | free_extent_map(em); |
7049 | return ERR_PTR(ret); | |
4b46fce2 | 7050 | } |
00361589 | 7051 | |
4b46fce2 JB |
7052 | return em; |
7053 | } | |
7054 | ||
46bfbb5c CM |
7055 | /* |
7056 | * returns 1 when the nocow is safe, < 1 on error, 0 if the | |
7057 | * block must be cow'd | |
7058 | */ | |
00361589 | 7059 | noinline int can_nocow_extent(struct inode *inode, u64 offset, u64 *len, |
7ee9e440 JB |
7060 | u64 *orig_start, u64 *orig_block_len, |
7061 | u64 *ram_bytes) | |
46bfbb5c | 7062 | { |
00361589 | 7063 | struct btrfs_trans_handle *trans; |
46bfbb5c CM |
7064 | struct btrfs_path *path; |
7065 | int ret; | |
7066 | struct extent_buffer *leaf; | |
7067 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
7b2b7085 | 7068 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; |
46bfbb5c CM |
7069 | struct btrfs_file_extent_item *fi; |
7070 | struct btrfs_key key; | |
7071 | u64 disk_bytenr; | |
7072 | u64 backref_offset; | |
7073 | u64 extent_end; | |
7074 | u64 num_bytes; | |
7075 | int slot; | |
7076 | int found_type; | |
7ee9e440 | 7077 | bool nocow = (BTRFS_I(inode)->flags & BTRFS_INODE_NODATACOW); |
e77751aa | 7078 | |
46bfbb5c CM |
7079 | path = btrfs_alloc_path(); |
7080 | if (!path) | |
7081 | return -ENOMEM; | |
7082 | ||
00361589 | 7083 | ret = btrfs_lookup_file_extent(NULL, root, path, btrfs_ino(inode), |
46bfbb5c CM |
7084 | offset, 0); |
7085 | if (ret < 0) | |
7086 | goto out; | |
7087 | ||
7088 | slot = path->slots[0]; | |
7089 | if (ret == 1) { | |
7090 | if (slot == 0) { | |
7091 | /* can't find the item, must cow */ | |
7092 | ret = 0; | |
7093 | goto out; | |
7094 | } | |
7095 | slot--; | |
7096 | } | |
7097 | ret = 0; | |
7098 | leaf = path->nodes[0]; | |
7099 | btrfs_item_key_to_cpu(leaf, &key, slot); | |
33345d01 | 7100 | if (key.objectid != btrfs_ino(inode) || |
46bfbb5c CM |
7101 | key.type != BTRFS_EXTENT_DATA_KEY) { |
7102 | /* not our file or wrong item type, must cow */ | |
7103 | goto out; | |
7104 | } | |
7105 | ||
7106 | if (key.offset > offset) { | |
7107 | /* Wrong offset, must cow */ | |
7108 | goto out; | |
7109 | } | |
7110 | ||
7111 | fi = btrfs_item_ptr(leaf, slot, struct btrfs_file_extent_item); | |
7112 | found_type = btrfs_file_extent_type(leaf, fi); | |
7113 | if (found_type != BTRFS_FILE_EXTENT_REG && | |
7114 | found_type != BTRFS_FILE_EXTENT_PREALLOC) { | |
7115 | /* not a regular extent, must cow */ | |
7116 | goto out; | |
7117 | } | |
7ee9e440 JB |
7118 | |
7119 | if (!nocow && found_type == BTRFS_FILE_EXTENT_REG) | |
7120 | goto out; | |
7121 | ||
e77751aa MX |
7122 | extent_end = key.offset + btrfs_file_extent_num_bytes(leaf, fi); |
7123 | if (extent_end <= offset) | |
7124 | goto out; | |
7125 | ||
46bfbb5c | 7126 | disk_bytenr = btrfs_file_extent_disk_bytenr(leaf, fi); |
7ee9e440 JB |
7127 | if (disk_bytenr == 0) |
7128 | goto out; | |
7129 | ||
7130 | if (btrfs_file_extent_compression(leaf, fi) || | |
7131 | btrfs_file_extent_encryption(leaf, fi) || | |
7132 | btrfs_file_extent_other_encoding(leaf, fi)) | |
7133 | goto out; | |
7134 | ||
46bfbb5c CM |
7135 | backref_offset = btrfs_file_extent_offset(leaf, fi); |
7136 | ||
7ee9e440 JB |
7137 | if (orig_start) { |
7138 | *orig_start = key.offset - backref_offset; | |
7139 | *orig_block_len = btrfs_file_extent_disk_num_bytes(leaf, fi); | |
7140 | *ram_bytes = btrfs_file_extent_ram_bytes(leaf, fi); | |
7141 | } | |
eb384b55 | 7142 | |
46bfbb5c CM |
7143 | if (btrfs_extent_readonly(root, disk_bytenr)) |
7144 | goto out; | |
7b2b7085 MX |
7145 | |
7146 | num_bytes = min(offset + *len, extent_end) - offset; | |
7147 | if (!nocow && found_type == BTRFS_FILE_EXTENT_PREALLOC) { | |
7148 | u64 range_end; | |
7149 | ||
7150 | range_end = round_up(offset + num_bytes, root->sectorsize) - 1; | |
7151 | ret = test_range_bit(io_tree, offset, range_end, | |
7152 | EXTENT_DELALLOC, 0, NULL); | |
7153 | if (ret) { | |
7154 | ret = -EAGAIN; | |
7155 | goto out; | |
7156 | } | |
7157 | } | |
7158 | ||
1bda19eb | 7159 | btrfs_release_path(path); |
46bfbb5c CM |
7160 | |
7161 | /* | |
7162 | * look for other files referencing this extent, if we | |
7163 | * find any we must cow | |
7164 | */ | |
00361589 JB |
7165 | trans = btrfs_join_transaction(root); |
7166 | if (IS_ERR(trans)) { | |
7167 | ret = 0; | |
46bfbb5c | 7168 | goto out; |
00361589 JB |
7169 | } |
7170 | ||
7171 | ret = btrfs_cross_ref_exist(trans, root, btrfs_ino(inode), | |
7172 | key.offset - backref_offset, disk_bytenr); | |
7173 | btrfs_end_transaction(trans, root); | |
7174 | if (ret) { | |
7175 | ret = 0; | |
7176 | goto out; | |
7177 | } | |
46bfbb5c CM |
7178 | |
7179 | /* | |
7180 | * adjust disk_bytenr and num_bytes to cover just the bytes | |
7181 | * in this extent we are about to write. If there | |
7182 | * are any csums in that range we have to cow in order | |
7183 | * to keep the csums correct | |
7184 | */ | |
7185 | disk_bytenr += backref_offset; | |
7186 | disk_bytenr += offset - key.offset; | |
46bfbb5c CM |
7187 | if (csum_exist_in_range(root, disk_bytenr, num_bytes)) |
7188 | goto out; | |
7189 | /* | |
7190 | * all of the above have passed, it is safe to overwrite this extent | |
7191 | * without cow | |
7192 | */ | |
eb384b55 | 7193 | *len = num_bytes; |
46bfbb5c CM |
7194 | ret = 1; |
7195 | out: | |
7196 | btrfs_free_path(path); | |
7197 | return ret; | |
7198 | } | |
7199 | ||
fc4adbff AG |
7200 | bool btrfs_page_exists_in_range(struct inode *inode, loff_t start, loff_t end) |
7201 | { | |
7202 | struct radix_tree_root *root = &inode->i_mapping->page_tree; | |
7203 | int found = false; | |
7204 | void **pagep = NULL; | |
7205 | struct page *page = NULL; | |
7206 | int start_idx; | |
7207 | int end_idx; | |
7208 | ||
7209 | start_idx = start >> PAGE_CACHE_SHIFT; | |
7210 | ||
7211 | /* | |
7212 | * end is the last byte in the last page. end == start is legal | |
7213 | */ | |
7214 | end_idx = end >> PAGE_CACHE_SHIFT; | |
7215 | ||
7216 | rcu_read_lock(); | |
7217 | ||
7218 | /* Most of the code in this while loop is lifted from | |
7219 | * find_get_page. It's been modified to begin searching from a | |
7220 | * page and return just the first page found in that range. If the | |
7221 | * found idx is less than or equal to the end idx then we know that | |
7222 | * a page exists. If no pages are found or if those pages are | |
7223 | * outside of the range then we're fine (yay!) */ | |
7224 | while (page == NULL && | |
7225 | radix_tree_gang_lookup_slot(root, &pagep, NULL, start_idx, 1)) { | |
7226 | page = radix_tree_deref_slot(pagep); | |
7227 | if (unlikely(!page)) | |
7228 | break; | |
7229 | ||
7230 | if (radix_tree_exception(page)) { | |
809f9016 FM |
7231 | if (radix_tree_deref_retry(page)) { |
7232 | page = NULL; | |
fc4adbff | 7233 | continue; |
809f9016 | 7234 | } |
fc4adbff AG |
7235 | /* |
7236 | * Otherwise, shmem/tmpfs must be storing a swap entry | |
7237 | * here as an exceptional entry: so return it without | |
7238 | * attempting to raise page count. | |
7239 | */ | |
6fdef6d4 | 7240 | page = NULL; |
fc4adbff AG |
7241 | break; /* TODO: Is this relevant for this use case? */ |
7242 | } | |
7243 | ||
91405151 FM |
7244 | if (!page_cache_get_speculative(page)) { |
7245 | page = NULL; | |
fc4adbff | 7246 | continue; |
91405151 | 7247 | } |
fc4adbff AG |
7248 | |
7249 | /* | |
7250 | * Has the page moved? | |
7251 | * This is part of the lockless pagecache protocol. See | |
7252 | * include/linux/pagemap.h for details. | |
7253 | */ | |
7254 | if (unlikely(page != *pagep)) { | |
7255 | page_cache_release(page); | |
7256 | page = NULL; | |
7257 | } | |
7258 | } | |
7259 | ||
7260 | if (page) { | |
7261 | if (page->index <= end_idx) | |
7262 | found = true; | |
7263 | page_cache_release(page); | |
7264 | } | |
7265 | ||
7266 | rcu_read_unlock(); | |
7267 | return found; | |
7268 | } | |
7269 | ||
eb838e73 JB |
7270 | static int lock_extent_direct(struct inode *inode, u64 lockstart, u64 lockend, |
7271 | struct extent_state **cached_state, int writing) | |
7272 | { | |
7273 | struct btrfs_ordered_extent *ordered; | |
7274 | int ret = 0; | |
7275 | ||
7276 | while (1) { | |
7277 | lock_extent_bits(&BTRFS_I(inode)->io_tree, lockstart, lockend, | |
7278 | 0, cached_state); | |
7279 | /* | |
7280 | * We're concerned with the entire range that we're going to be | |
7281 | * doing DIO to, so we need to make sure theres no ordered | |
7282 | * extents in this range. | |
7283 | */ | |
7284 | ordered = btrfs_lookup_ordered_range(inode, lockstart, | |
7285 | lockend - lockstart + 1); | |
7286 | ||
7287 | /* | |
7288 | * We need to make sure there are no buffered pages in this | |
7289 | * range either, we could have raced between the invalidate in | |
7290 | * generic_file_direct_write and locking the extent. The | |
7291 | * invalidate needs to happen so that reads after a write do not | |
7292 | * get stale data. | |
7293 | */ | |
fc4adbff AG |
7294 | if (!ordered && |
7295 | (!writing || | |
7296 | !btrfs_page_exists_in_range(inode, lockstart, lockend))) | |
eb838e73 JB |
7297 | break; |
7298 | ||
7299 | unlock_extent_cached(&BTRFS_I(inode)->io_tree, lockstart, lockend, | |
7300 | cached_state, GFP_NOFS); | |
7301 | ||
7302 | if (ordered) { | |
7303 | btrfs_start_ordered_extent(inode, ordered, 1); | |
7304 | btrfs_put_ordered_extent(ordered); | |
7305 | } else { | |
7306 | /* Screw you mmap */ | |
728404da | 7307 | ret = btrfs_fdatawrite_range(inode, lockstart, lockend); |
075bdbdb FM |
7308 | if (ret) |
7309 | break; | |
7310 | ret = filemap_fdatawait_range(inode->i_mapping, | |
7311 | lockstart, | |
7312 | lockend); | |
eb838e73 JB |
7313 | if (ret) |
7314 | break; | |
7315 | ||
7316 | /* | |
7317 | * If we found a page that couldn't be invalidated just | |
7318 | * fall back to buffered. | |
7319 | */ | |
7320 | ret = invalidate_inode_pages2_range(inode->i_mapping, | |
7321 | lockstart >> PAGE_CACHE_SHIFT, | |
7322 | lockend >> PAGE_CACHE_SHIFT); | |
7323 | if (ret) | |
7324 | break; | |
7325 | } | |
7326 | ||
7327 | cond_resched(); | |
7328 | } | |
7329 | ||
7330 | return ret; | |
7331 | } | |
7332 | ||
69ffb543 JB |
7333 | static struct extent_map *create_pinned_em(struct inode *inode, u64 start, |
7334 | u64 len, u64 orig_start, | |
7335 | u64 block_start, u64 block_len, | |
cc95bef6 JB |
7336 | u64 orig_block_len, u64 ram_bytes, |
7337 | int type) | |
69ffb543 JB |
7338 | { |
7339 | struct extent_map_tree *em_tree; | |
7340 | struct extent_map *em; | |
7341 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
7342 | int ret; | |
7343 | ||
7344 | em_tree = &BTRFS_I(inode)->extent_tree; | |
7345 | em = alloc_extent_map(); | |
7346 | if (!em) | |
7347 | return ERR_PTR(-ENOMEM); | |
7348 | ||
7349 | em->start = start; | |
7350 | em->orig_start = orig_start; | |
2ab28f32 JB |
7351 | em->mod_start = start; |
7352 | em->mod_len = len; | |
69ffb543 JB |
7353 | em->len = len; |
7354 | em->block_len = block_len; | |
7355 | em->block_start = block_start; | |
7356 | em->bdev = root->fs_info->fs_devices->latest_bdev; | |
b4939680 | 7357 | em->orig_block_len = orig_block_len; |
cc95bef6 | 7358 | em->ram_bytes = ram_bytes; |
70c8a91c | 7359 | em->generation = -1; |
69ffb543 JB |
7360 | set_bit(EXTENT_FLAG_PINNED, &em->flags); |
7361 | if (type == BTRFS_ORDERED_PREALLOC) | |
b11e234d | 7362 | set_bit(EXTENT_FLAG_FILLING, &em->flags); |
69ffb543 JB |
7363 | |
7364 | do { | |
7365 | btrfs_drop_extent_cache(inode, em->start, | |
7366 | em->start + em->len - 1, 0); | |
7367 | write_lock(&em_tree->lock); | |
09a2a8f9 | 7368 | ret = add_extent_mapping(em_tree, em, 1); |
69ffb543 JB |
7369 | write_unlock(&em_tree->lock); |
7370 | } while (ret == -EEXIST); | |
7371 | ||
7372 | if (ret) { | |
7373 | free_extent_map(em); | |
7374 | return ERR_PTR(ret); | |
7375 | } | |
7376 | ||
7377 | return em; | |
7378 | } | |
7379 | ||
7380 | ||
4b46fce2 JB |
7381 | static int btrfs_get_blocks_direct(struct inode *inode, sector_t iblock, |
7382 | struct buffer_head *bh_result, int create) | |
7383 | { | |
7384 | struct extent_map *em; | |
7385 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
eb838e73 | 7386 | struct extent_state *cached_state = NULL; |
4b46fce2 | 7387 | u64 start = iblock << inode->i_blkbits; |
eb838e73 | 7388 | u64 lockstart, lockend; |
4b46fce2 | 7389 | u64 len = bh_result->b_size; |
e1cbbfa5 | 7390 | u64 *outstanding_extents = NULL; |
eb838e73 | 7391 | int unlock_bits = EXTENT_LOCKED; |
0934856d | 7392 | int ret = 0; |
eb838e73 | 7393 | |
172a5049 | 7394 | if (create) |
3266789f | 7395 | unlock_bits |= EXTENT_DIRTY; |
172a5049 | 7396 | else |
c329861d | 7397 | len = min_t(u64, len, root->sectorsize); |
eb838e73 | 7398 | |
c329861d JB |
7399 | lockstart = start; |
7400 | lockend = start + len - 1; | |
7401 | ||
e1cbbfa5 JB |
7402 | if (current->journal_info) { |
7403 | /* | |
7404 | * Need to pull our outstanding extents and set journal_info to NULL so | |
7405 | * that anything that needs to check if there's a transction doesn't get | |
7406 | * confused. | |
7407 | */ | |
7408 | outstanding_extents = current->journal_info; | |
7409 | current->journal_info = NULL; | |
7410 | } | |
7411 | ||
eb838e73 JB |
7412 | /* |
7413 | * If this errors out it's because we couldn't invalidate pagecache for | |
7414 | * this range and we need to fallback to buffered. | |
7415 | */ | |
7416 | if (lock_extent_direct(inode, lockstart, lockend, &cached_state, create)) | |
7417 | return -ENOTBLK; | |
7418 | ||
4b46fce2 | 7419 | em = btrfs_get_extent(inode, NULL, 0, start, len, 0); |
eb838e73 JB |
7420 | if (IS_ERR(em)) { |
7421 | ret = PTR_ERR(em); | |
7422 | goto unlock_err; | |
7423 | } | |
4b46fce2 JB |
7424 | |
7425 | /* | |
7426 | * Ok for INLINE and COMPRESSED extents we need to fallback on buffered | |
7427 | * io. INLINE is special, and we could probably kludge it in here, but | |
7428 | * it's still buffered so for safety lets just fall back to the generic | |
7429 | * buffered path. | |
7430 | * | |
7431 | * For COMPRESSED we _have_ to read the entire extent in so we can | |
7432 | * decompress it, so there will be buffering required no matter what we | |
7433 | * do, so go ahead and fallback to buffered. | |
7434 | * | |
7435 | * We return -ENOTBLK because thats what makes DIO go ahead and go back | |
7436 | * to buffered IO. Don't blame me, this is the price we pay for using | |
7437 | * the generic code. | |
7438 | */ | |
7439 | if (test_bit(EXTENT_FLAG_COMPRESSED, &em->flags) || | |
7440 | em->block_start == EXTENT_MAP_INLINE) { | |
7441 | free_extent_map(em); | |
eb838e73 JB |
7442 | ret = -ENOTBLK; |
7443 | goto unlock_err; | |
4b46fce2 JB |
7444 | } |
7445 | ||
7446 | /* Just a good old fashioned hole, return */ | |
7447 | if (!create && (em->block_start == EXTENT_MAP_HOLE || | |
7448 | test_bit(EXTENT_FLAG_PREALLOC, &em->flags))) { | |
7449 | free_extent_map(em); | |
eb838e73 | 7450 | goto unlock_err; |
4b46fce2 JB |
7451 | } |
7452 | ||
7453 | /* | |
7454 | * We don't allocate a new extent in the following cases | |
7455 | * | |
7456 | * 1) The inode is marked as NODATACOW. In this case we'll just use the | |
7457 | * existing extent. | |
7458 | * 2) The extent is marked as PREALLOC. We're good to go here and can | |
7459 | * just use the extent. | |
7460 | * | |
7461 | */ | |
46bfbb5c | 7462 | if (!create) { |
eb838e73 JB |
7463 | len = min(len, em->len - (start - em->start)); |
7464 | lockstart = start + len; | |
7465 | goto unlock; | |
46bfbb5c | 7466 | } |
4b46fce2 JB |
7467 | |
7468 | if (test_bit(EXTENT_FLAG_PREALLOC, &em->flags) || | |
7469 | ((BTRFS_I(inode)->flags & BTRFS_INODE_NODATACOW) && | |
7470 | em->block_start != EXTENT_MAP_HOLE)) { | |
4b46fce2 | 7471 | int type; |
eb384b55 | 7472 | u64 block_start, orig_start, orig_block_len, ram_bytes; |
4b46fce2 JB |
7473 | |
7474 | if (test_bit(EXTENT_FLAG_PREALLOC, &em->flags)) | |
7475 | type = BTRFS_ORDERED_PREALLOC; | |
7476 | else | |
7477 | type = BTRFS_ORDERED_NOCOW; | |
46bfbb5c | 7478 | len = min(len, em->len - (start - em->start)); |
4b46fce2 | 7479 | block_start = em->block_start + (start - em->start); |
46bfbb5c | 7480 | |
00361589 | 7481 | if (can_nocow_extent(inode, start, &len, &orig_start, |
7ee9e440 | 7482 | &orig_block_len, &ram_bytes) == 1) { |
69ffb543 JB |
7483 | if (type == BTRFS_ORDERED_PREALLOC) { |
7484 | free_extent_map(em); | |
7485 | em = create_pinned_em(inode, start, len, | |
7486 | orig_start, | |
b4939680 | 7487 | block_start, len, |
cc95bef6 JB |
7488 | orig_block_len, |
7489 | ram_bytes, type); | |
555e1286 FM |
7490 | if (IS_ERR(em)) { |
7491 | ret = PTR_ERR(em); | |
69ffb543 | 7492 | goto unlock_err; |
555e1286 | 7493 | } |
69ffb543 JB |
7494 | } |
7495 | ||
46bfbb5c CM |
7496 | ret = btrfs_add_ordered_extent_dio(inode, start, |
7497 | block_start, len, len, type); | |
46bfbb5c CM |
7498 | if (ret) { |
7499 | free_extent_map(em); | |
eb838e73 | 7500 | goto unlock_err; |
46bfbb5c CM |
7501 | } |
7502 | goto unlock; | |
4b46fce2 | 7503 | } |
4b46fce2 | 7504 | } |
00361589 | 7505 | |
46bfbb5c CM |
7506 | /* |
7507 | * this will cow the extent, reset the len in case we changed | |
7508 | * it above | |
7509 | */ | |
7510 | len = bh_result->b_size; | |
70c8a91c JB |
7511 | free_extent_map(em); |
7512 | em = btrfs_new_extent_direct(inode, start, len); | |
eb838e73 JB |
7513 | if (IS_ERR(em)) { |
7514 | ret = PTR_ERR(em); | |
7515 | goto unlock_err; | |
7516 | } | |
46bfbb5c CM |
7517 | len = min(len, em->len - (start - em->start)); |
7518 | unlock: | |
4b46fce2 JB |
7519 | bh_result->b_blocknr = (em->block_start + (start - em->start)) >> |
7520 | inode->i_blkbits; | |
46bfbb5c | 7521 | bh_result->b_size = len; |
4b46fce2 JB |
7522 | bh_result->b_bdev = em->bdev; |
7523 | set_buffer_mapped(bh_result); | |
c3473e83 JB |
7524 | if (create) { |
7525 | if (!test_bit(EXTENT_FLAG_PREALLOC, &em->flags)) | |
7526 | set_buffer_new(bh_result); | |
7527 | ||
7528 | /* | |
7529 | * Need to update the i_size under the extent lock so buffered | |
7530 | * readers will get the updated i_size when we unlock. | |
7531 | */ | |
7532 | if (start + len > i_size_read(inode)) | |
7533 | i_size_write(inode, start + len); | |
0934856d | 7534 | |
e1cbbfa5 JB |
7535 | /* |
7536 | * If we have an outstanding_extents count still set then we're | |
7537 | * within our reservation, otherwise we need to adjust our inode | |
7538 | * counter appropriately. | |
7539 | */ | |
7540 | if (*outstanding_extents) { | |
7541 | (*outstanding_extents)--; | |
7542 | } else { | |
3e05bde8 JB |
7543 | spin_lock(&BTRFS_I(inode)->lock); |
7544 | BTRFS_I(inode)->outstanding_extents++; | |
7545 | spin_unlock(&BTRFS_I(inode)->lock); | |
7546 | } | |
e1cbbfa5 JB |
7547 | |
7548 | current->journal_info = outstanding_extents; | |
3266789f | 7549 | btrfs_free_reserved_data_space(inode, len); |
ddba1bfc | 7550 | set_bit(BTRFS_INODE_DIO_READY, &BTRFS_I(inode)->runtime_flags); |
c3473e83 | 7551 | } |
4b46fce2 | 7552 | |
eb838e73 JB |
7553 | /* |
7554 | * In the case of write we need to clear and unlock the entire range, | |
7555 | * in the case of read we need to unlock only the end area that we | |
7556 | * aren't using if there is any left over space. | |
7557 | */ | |
24c03fa5 | 7558 | if (lockstart < lockend) { |
0934856d MX |
7559 | clear_extent_bit(&BTRFS_I(inode)->io_tree, lockstart, |
7560 | lockend, unlock_bits, 1, 0, | |
7561 | &cached_state, GFP_NOFS); | |
24c03fa5 | 7562 | } else { |
eb838e73 | 7563 | free_extent_state(cached_state); |
24c03fa5 | 7564 | } |
eb838e73 | 7565 | |
4b46fce2 JB |
7566 | free_extent_map(em); |
7567 | ||
7568 | return 0; | |
eb838e73 JB |
7569 | |
7570 | unlock_err: | |
eb838e73 JB |
7571 | clear_extent_bit(&BTRFS_I(inode)->io_tree, lockstart, lockend, |
7572 | unlock_bits, 1, 0, &cached_state, GFP_NOFS); | |
e1cbbfa5 JB |
7573 | if (outstanding_extents) |
7574 | current->journal_info = outstanding_extents; | |
eb838e73 | 7575 | return ret; |
4b46fce2 JB |
7576 | } |
7577 | ||
8b110e39 MX |
7578 | static inline int submit_dio_repair_bio(struct inode *inode, struct bio *bio, |
7579 | int rw, int mirror_num) | |
7580 | { | |
7581 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
7582 | int ret; | |
7583 | ||
7584 | BUG_ON(rw & REQ_WRITE); | |
7585 | ||
7586 | bio_get(bio); | |
7587 | ||
7588 | ret = btrfs_bio_wq_end_io(root->fs_info, bio, | |
7589 | BTRFS_WQ_ENDIO_DIO_REPAIR); | |
7590 | if (ret) | |
7591 | goto err; | |
7592 | ||
7593 | ret = btrfs_map_bio(root, rw, bio, mirror_num, 0); | |
7594 | err: | |
7595 | bio_put(bio); | |
7596 | return ret; | |
7597 | } | |
7598 | ||
7599 | static int btrfs_check_dio_repairable(struct inode *inode, | |
7600 | struct bio *failed_bio, | |
7601 | struct io_failure_record *failrec, | |
7602 | int failed_mirror) | |
7603 | { | |
7604 | int num_copies; | |
7605 | ||
7606 | num_copies = btrfs_num_copies(BTRFS_I(inode)->root->fs_info, | |
7607 | failrec->logical, failrec->len); | |
7608 | if (num_copies == 1) { | |
7609 | /* | |
7610 | * we only have a single copy of the data, so don't bother with | |
7611 | * all the retry and error correction code that follows. no | |
7612 | * matter what the error is, it is very likely to persist. | |
7613 | */ | |
7614 | pr_debug("Check DIO Repairable: cannot repair, num_copies=%d, next_mirror %d, failed_mirror %d\n", | |
7615 | num_copies, failrec->this_mirror, failed_mirror); | |
7616 | return 0; | |
7617 | } | |
7618 | ||
7619 | failrec->failed_mirror = failed_mirror; | |
7620 | failrec->this_mirror++; | |
7621 | if (failrec->this_mirror == failed_mirror) | |
7622 | failrec->this_mirror++; | |
7623 | ||
7624 | if (failrec->this_mirror > num_copies) { | |
7625 | pr_debug("Check DIO Repairable: (fail) num_copies=%d, next_mirror %d, failed_mirror %d\n", | |
7626 | num_copies, failrec->this_mirror, failed_mirror); | |
7627 | return 0; | |
7628 | } | |
7629 | ||
7630 | return 1; | |
7631 | } | |
7632 | ||
7633 | static int dio_read_error(struct inode *inode, struct bio *failed_bio, | |
7634 | struct page *page, u64 start, u64 end, | |
7635 | int failed_mirror, bio_end_io_t *repair_endio, | |
7636 | void *repair_arg) | |
7637 | { | |
7638 | struct io_failure_record *failrec; | |
7639 | struct bio *bio; | |
7640 | int isector; | |
7641 | int read_mode; | |
7642 | int ret; | |
7643 | ||
7644 | BUG_ON(failed_bio->bi_rw & REQ_WRITE); | |
7645 | ||
7646 | ret = btrfs_get_io_failure_record(inode, start, end, &failrec); | |
7647 | if (ret) | |
7648 | return ret; | |
7649 | ||
7650 | ret = btrfs_check_dio_repairable(inode, failed_bio, failrec, | |
7651 | failed_mirror); | |
7652 | if (!ret) { | |
7653 | free_io_failure(inode, failrec); | |
7654 | return -EIO; | |
7655 | } | |
7656 | ||
7657 | if (failed_bio->bi_vcnt > 1) | |
7658 | read_mode = READ_SYNC | REQ_FAILFAST_DEV; | |
7659 | else | |
7660 | read_mode = READ_SYNC; | |
7661 | ||
7662 | isector = start - btrfs_io_bio(failed_bio)->logical; | |
7663 | isector >>= inode->i_sb->s_blocksize_bits; | |
7664 | bio = btrfs_create_repair_bio(inode, failed_bio, failrec, page, | |
7665 | 0, isector, repair_endio, repair_arg); | |
7666 | if (!bio) { | |
7667 | free_io_failure(inode, failrec); | |
7668 | return -EIO; | |
7669 | } | |
7670 | ||
7671 | btrfs_debug(BTRFS_I(inode)->root->fs_info, | |
7672 | "Repair DIO Read Error: submitting new dio read[%#x] to this_mirror=%d, in_validation=%d\n", | |
7673 | read_mode, failrec->this_mirror, failrec->in_validation); | |
7674 | ||
7675 | ret = submit_dio_repair_bio(inode, bio, read_mode, | |
7676 | failrec->this_mirror); | |
7677 | if (ret) { | |
7678 | free_io_failure(inode, failrec); | |
7679 | bio_put(bio); | |
7680 | } | |
7681 | ||
7682 | return ret; | |
7683 | } | |
7684 | ||
7685 | struct btrfs_retry_complete { | |
7686 | struct completion done; | |
7687 | struct inode *inode; | |
7688 | u64 start; | |
7689 | int uptodate; | |
7690 | }; | |
7691 | ||
7692 | static void btrfs_retry_endio_nocsum(struct bio *bio, int err) | |
7693 | { | |
7694 | struct btrfs_retry_complete *done = bio->bi_private; | |
7695 | struct bio_vec *bvec; | |
7696 | int i; | |
7697 | ||
7698 | if (err) | |
7699 | goto end; | |
7700 | ||
7701 | done->uptodate = 1; | |
7702 | bio_for_each_segment_all(bvec, bio, i) | |
7703 | clean_io_failure(done->inode, done->start, bvec->bv_page, 0); | |
7704 | end: | |
7705 | complete(&done->done); | |
7706 | bio_put(bio); | |
7707 | } | |
7708 | ||
7709 | static int __btrfs_correct_data_nocsum(struct inode *inode, | |
7710 | struct btrfs_io_bio *io_bio) | |
4b46fce2 | 7711 | { |
2c30c71b | 7712 | struct bio_vec *bvec; |
8b110e39 | 7713 | struct btrfs_retry_complete done; |
4b46fce2 | 7714 | u64 start; |
2c30c71b | 7715 | int i; |
c1dc0896 | 7716 | int ret; |
4b46fce2 | 7717 | |
8b110e39 MX |
7718 | start = io_bio->logical; |
7719 | done.inode = inode; | |
7720 | ||
7721 | bio_for_each_segment_all(bvec, &io_bio->bio, i) { | |
7722 | try_again: | |
7723 | done.uptodate = 0; | |
7724 | done.start = start; | |
7725 | init_completion(&done.done); | |
7726 | ||
7727 | ret = dio_read_error(inode, &io_bio->bio, bvec->bv_page, start, | |
7728 | start + bvec->bv_len - 1, | |
7729 | io_bio->mirror_num, | |
7730 | btrfs_retry_endio_nocsum, &done); | |
7731 | if (ret) | |
7732 | return ret; | |
7733 | ||
7734 | wait_for_completion(&done.done); | |
7735 | ||
7736 | if (!done.uptodate) { | |
7737 | /* We might have another mirror, so try again */ | |
7738 | goto try_again; | |
7739 | } | |
7740 | ||
7741 | start += bvec->bv_len; | |
7742 | } | |
7743 | ||
7744 | return 0; | |
7745 | } | |
7746 | ||
7747 | static void btrfs_retry_endio(struct bio *bio, int err) | |
7748 | { | |
7749 | struct btrfs_retry_complete *done = bio->bi_private; | |
7750 | struct btrfs_io_bio *io_bio = btrfs_io_bio(bio); | |
7751 | struct bio_vec *bvec; | |
7752 | int uptodate; | |
7753 | int ret; | |
7754 | int i; | |
7755 | ||
7756 | if (err) | |
7757 | goto end; | |
7758 | ||
7759 | uptodate = 1; | |
7760 | bio_for_each_segment_all(bvec, bio, i) { | |
7761 | ret = __readpage_endio_check(done->inode, io_bio, i, | |
7762 | bvec->bv_page, 0, | |
7763 | done->start, bvec->bv_len); | |
7764 | if (!ret) | |
7765 | clean_io_failure(done->inode, done->start, | |
7766 | bvec->bv_page, 0); | |
7767 | else | |
7768 | uptodate = 0; | |
7769 | } | |
7770 | ||
7771 | done->uptodate = uptodate; | |
7772 | end: | |
7773 | complete(&done->done); | |
7774 | bio_put(bio); | |
7775 | } | |
7776 | ||
7777 | static int __btrfs_subio_endio_read(struct inode *inode, | |
7778 | struct btrfs_io_bio *io_bio, int err) | |
7779 | { | |
7780 | struct bio_vec *bvec; | |
7781 | struct btrfs_retry_complete done; | |
7782 | u64 start; | |
7783 | u64 offset = 0; | |
7784 | int i; | |
7785 | int ret; | |
dc380aea | 7786 | |
8b110e39 | 7787 | err = 0; |
c1dc0896 | 7788 | start = io_bio->logical; |
8b110e39 MX |
7789 | done.inode = inode; |
7790 | ||
c1dc0896 | 7791 | bio_for_each_segment_all(bvec, &io_bio->bio, i) { |
dc380aea MX |
7792 | ret = __readpage_endio_check(inode, io_bio, i, bvec->bv_page, |
7793 | 0, start, bvec->bv_len); | |
8b110e39 MX |
7794 | if (likely(!ret)) |
7795 | goto next; | |
7796 | try_again: | |
7797 | done.uptodate = 0; | |
7798 | done.start = start; | |
7799 | init_completion(&done.done); | |
7800 | ||
7801 | ret = dio_read_error(inode, &io_bio->bio, bvec->bv_page, start, | |
7802 | start + bvec->bv_len - 1, | |
7803 | io_bio->mirror_num, | |
7804 | btrfs_retry_endio, &done); | |
7805 | if (ret) { | |
7806 | err = ret; | |
7807 | goto next; | |
7808 | } | |
7809 | ||
7810 | wait_for_completion(&done.done); | |
7811 | ||
7812 | if (!done.uptodate) { | |
7813 | /* We might have another mirror, so try again */ | |
7814 | goto try_again; | |
7815 | } | |
7816 | next: | |
7817 | offset += bvec->bv_len; | |
4b46fce2 | 7818 | start += bvec->bv_len; |
2c30c71b | 7819 | } |
c1dc0896 MX |
7820 | |
7821 | return err; | |
7822 | } | |
7823 | ||
8b110e39 MX |
7824 | static int btrfs_subio_endio_read(struct inode *inode, |
7825 | struct btrfs_io_bio *io_bio, int err) | |
7826 | { | |
7827 | bool skip_csum = BTRFS_I(inode)->flags & BTRFS_INODE_NODATASUM; | |
7828 | ||
7829 | if (skip_csum) { | |
7830 | if (unlikely(err)) | |
7831 | return __btrfs_correct_data_nocsum(inode, io_bio); | |
7832 | else | |
7833 | return 0; | |
7834 | } else { | |
7835 | return __btrfs_subio_endio_read(inode, io_bio, err); | |
7836 | } | |
7837 | } | |
7838 | ||
c1dc0896 MX |
7839 | static void btrfs_endio_direct_read(struct bio *bio, int err) |
7840 | { | |
7841 | struct btrfs_dio_private *dip = bio->bi_private; | |
7842 | struct inode *inode = dip->inode; | |
7843 | struct bio *dio_bio; | |
7844 | struct btrfs_io_bio *io_bio = btrfs_io_bio(bio); | |
7845 | ||
8b110e39 MX |
7846 | if (dip->flags & BTRFS_DIO_ORIG_BIO_SUBMITTED) |
7847 | err = btrfs_subio_endio_read(inode, io_bio, err); | |
c1dc0896 | 7848 | |
4b46fce2 | 7849 | unlock_extent(&BTRFS_I(inode)->io_tree, dip->logical_offset, |
d0082371 | 7850 | dip->logical_offset + dip->bytes - 1); |
9be3395b | 7851 | dio_bio = dip->dio_bio; |
4b46fce2 | 7852 | |
4b46fce2 | 7853 | kfree(dip); |
c0da7aa1 JB |
7854 | |
7855 | /* If we had a csum failure make sure to clear the uptodate flag */ | |
7856 | if (err) | |
9be3395b CM |
7857 | clear_bit(BIO_UPTODATE, &dio_bio->bi_flags); |
7858 | dio_end_io(dio_bio, err); | |
23ea8e5a MX |
7859 | |
7860 | if (io_bio->end_io) | |
7861 | io_bio->end_io(io_bio, err); | |
9be3395b | 7862 | bio_put(bio); |
4b46fce2 JB |
7863 | } |
7864 | ||
7865 | static void btrfs_endio_direct_write(struct bio *bio, int err) | |
7866 | { | |
7867 | struct btrfs_dio_private *dip = bio->bi_private; | |
7868 | struct inode *inode = dip->inode; | |
7869 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
4b46fce2 | 7870 | struct btrfs_ordered_extent *ordered = NULL; |
163cf09c CM |
7871 | u64 ordered_offset = dip->logical_offset; |
7872 | u64 ordered_bytes = dip->bytes; | |
9be3395b | 7873 | struct bio *dio_bio; |
4b46fce2 JB |
7874 | int ret; |
7875 | ||
163cf09c CM |
7876 | again: |
7877 | ret = btrfs_dec_test_first_ordered_pending(inode, &ordered, | |
7878 | &ordered_offset, | |
5fd02043 | 7879 | ordered_bytes, !err); |
4b46fce2 | 7880 | if (!ret) |
163cf09c | 7881 | goto out_test; |
4b46fce2 | 7882 | |
9e0af237 LB |
7883 | btrfs_init_work(&ordered->work, btrfs_endio_write_helper, |
7884 | finish_ordered_fn, NULL, NULL); | |
fccb5d86 QW |
7885 | btrfs_queue_work(root->fs_info->endio_write_workers, |
7886 | &ordered->work); | |
163cf09c CM |
7887 | out_test: |
7888 | /* | |
7889 | * our bio might span multiple ordered extents. If we haven't | |
7890 | * completed the accounting for the whole dio, go back and try again | |
7891 | */ | |
7892 | if (ordered_offset < dip->logical_offset + dip->bytes) { | |
7893 | ordered_bytes = dip->logical_offset + dip->bytes - | |
7894 | ordered_offset; | |
5fd02043 | 7895 | ordered = NULL; |
163cf09c CM |
7896 | goto again; |
7897 | } | |
9be3395b | 7898 | dio_bio = dip->dio_bio; |
4b46fce2 | 7899 | |
4b46fce2 | 7900 | kfree(dip); |
c0da7aa1 JB |
7901 | |
7902 | /* If we had an error make sure to clear the uptodate flag */ | |
7903 | if (err) | |
9be3395b CM |
7904 | clear_bit(BIO_UPTODATE, &dio_bio->bi_flags); |
7905 | dio_end_io(dio_bio, err); | |
7906 | bio_put(bio); | |
4b46fce2 JB |
7907 | } |
7908 | ||
eaf25d93 CM |
7909 | static int __btrfs_submit_bio_start_direct_io(struct inode *inode, int rw, |
7910 | struct bio *bio, int mirror_num, | |
7911 | unsigned long bio_flags, u64 offset) | |
7912 | { | |
7913 | int ret; | |
7914 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
7915 | ret = btrfs_csum_one_bio(root, inode, bio, offset, 1); | |
79787eaa | 7916 | BUG_ON(ret); /* -ENOMEM */ |
eaf25d93 CM |
7917 | return 0; |
7918 | } | |
7919 | ||
e65e1535 MX |
7920 | static void btrfs_end_dio_bio(struct bio *bio, int err) |
7921 | { | |
7922 | struct btrfs_dio_private *dip = bio->bi_private; | |
7923 | ||
8b110e39 MX |
7924 | if (err) |
7925 | btrfs_warn(BTRFS_I(dip->inode)->root->fs_info, | |
7926 | "direct IO failed ino %llu rw %lu sector %#Lx len %u err no %d", | |
7927 | btrfs_ino(dip->inode), bio->bi_rw, | |
7928 | (unsigned long long)bio->bi_iter.bi_sector, | |
7929 | bio->bi_iter.bi_size, err); | |
7930 | ||
7931 | if (dip->subio_endio) | |
7932 | err = dip->subio_endio(dip->inode, btrfs_io_bio(bio), err); | |
c1dc0896 MX |
7933 | |
7934 | if (err) { | |
e65e1535 MX |
7935 | dip->errors = 1; |
7936 | ||
7937 | /* | |
7938 | * before atomic variable goto zero, we must make sure | |
7939 | * dip->errors is perceived to be set. | |
7940 | */ | |
4e857c58 | 7941 | smp_mb__before_atomic(); |
e65e1535 MX |
7942 | } |
7943 | ||
7944 | /* if there are more bios still pending for this dio, just exit */ | |
7945 | if (!atomic_dec_and_test(&dip->pending_bios)) | |
7946 | goto out; | |
7947 | ||
9be3395b | 7948 | if (dip->errors) { |
e65e1535 | 7949 | bio_io_error(dip->orig_bio); |
9be3395b CM |
7950 | } else { |
7951 | set_bit(BIO_UPTODATE, &dip->dio_bio->bi_flags); | |
e65e1535 MX |
7952 | bio_endio(dip->orig_bio, 0); |
7953 | } | |
7954 | out: | |
7955 | bio_put(bio); | |
7956 | } | |
7957 | ||
7958 | static struct bio *btrfs_dio_bio_alloc(struct block_device *bdev, | |
7959 | u64 first_sector, gfp_t gfp_flags) | |
7960 | { | |
7961 | int nr_vecs = bio_get_nr_vecs(bdev); | |
7962 | return btrfs_bio_alloc(bdev, first_sector, nr_vecs, gfp_flags); | |
7963 | } | |
7964 | ||
c1dc0896 MX |
7965 | static inline int btrfs_lookup_and_bind_dio_csum(struct btrfs_root *root, |
7966 | struct inode *inode, | |
7967 | struct btrfs_dio_private *dip, | |
7968 | struct bio *bio, | |
7969 | u64 file_offset) | |
7970 | { | |
7971 | struct btrfs_io_bio *io_bio = btrfs_io_bio(bio); | |
7972 | struct btrfs_io_bio *orig_io_bio = btrfs_io_bio(dip->orig_bio); | |
7973 | int ret; | |
7974 | ||
7975 | /* | |
7976 | * We load all the csum data we need when we submit | |
7977 | * the first bio to reduce the csum tree search and | |
7978 | * contention. | |
7979 | */ | |
7980 | if (dip->logical_offset == file_offset) { | |
7981 | ret = btrfs_lookup_bio_sums_dio(root, inode, dip->orig_bio, | |
7982 | file_offset); | |
7983 | if (ret) | |
7984 | return ret; | |
7985 | } | |
7986 | ||
7987 | if (bio == dip->orig_bio) | |
7988 | return 0; | |
7989 | ||
7990 | file_offset -= dip->logical_offset; | |
7991 | file_offset >>= inode->i_sb->s_blocksize_bits; | |
7992 | io_bio->csum = (u8 *)(((u32 *)orig_io_bio->csum) + file_offset); | |
7993 | ||
7994 | return 0; | |
7995 | } | |
7996 | ||
e65e1535 MX |
7997 | static inline int __btrfs_submit_dio_bio(struct bio *bio, struct inode *inode, |
7998 | int rw, u64 file_offset, int skip_sum, | |
c329861d | 7999 | int async_submit) |
e65e1535 | 8000 | { |
facc8a22 | 8001 | struct btrfs_dio_private *dip = bio->bi_private; |
e65e1535 MX |
8002 | int write = rw & REQ_WRITE; |
8003 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
8004 | int ret; | |
8005 | ||
b812ce28 JB |
8006 | if (async_submit) |
8007 | async_submit = !atomic_read(&BTRFS_I(inode)->sync_writers); | |
8008 | ||
e65e1535 | 8009 | bio_get(bio); |
5fd02043 JB |
8010 | |
8011 | if (!write) { | |
bfebd8b5 DS |
8012 | ret = btrfs_bio_wq_end_io(root->fs_info, bio, |
8013 | BTRFS_WQ_ENDIO_DATA); | |
5fd02043 JB |
8014 | if (ret) |
8015 | goto err; | |
8016 | } | |
e65e1535 | 8017 | |
1ae39938 JB |
8018 | if (skip_sum) |
8019 | goto map; | |
8020 | ||
8021 | if (write && async_submit) { | |
e65e1535 MX |
8022 | ret = btrfs_wq_submit_bio(root->fs_info, |
8023 | inode, rw, bio, 0, 0, | |
8024 | file_offset, | |
8025 | __btrfs_submit_bio_start_direct_io, | |
8026 | __btrfs_submit_bio_done); | |
8027 | goto err; | |
1ae39938 JB |
8028 | } else if (write) { |
8029 | /* | |
8030 | * If we aren't doing async submit, calculate the csum of the | |
8031 | * bio now. | |
8032 | */ | |
8033 | ret = btrfs_csum_one_bio(root, inode, bio, file_offset, 1); | |
8034 | if (ret) | |
8035 | goto err; | |
23ea8e5a | 8036 | } else { |
c1dc0896 MX |
8037 | ret = btrfs_lookup_and_bind_dio_csum(root, inode, dip, bio, |
8038 | file_offset); | |
c2db1073 TI |
8039 | if (ret) |
8040 | goto err; | |
8041 | } | |
1ae39938 JB |
8042 | map: |
8043 | ret = btrfs_map_bio(root, rw, bio, 0, async_submit); | |
e65e1535 MX |
8044 | err: |
8045 | bio_put(bio); | |
8046 | return ret; | |
8047 | } | |
8048 | ||
8049 | static int btrfs_submit_direct_hook(int rw, struct btrfs_dio_private *dip, | |
8050 | int skip_sum) | |
8051 | { | |
8052 | struct inode *inode = dip->inode; | |
8053 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
e65e1535 MX |
8054 | struct bio *bio; |
8055 | struct bio *orig_bio = dip->orig_bio; | |
8056 | struct bio_vec *bvec = orig_bio->bi_io_vec; | |
4f024f37 | 8057 | u64 start_sector = orig_bio->bi_iter.bi_sector; |
e65e1535 MX |
8058 | u64 file_offset = dip->logical_offset; |
8059 | u64 submit_len = 0; | |
8060 | u64 map_length; | |
8061 | int nr_pages = 0; | |
23ea8e5a | 8062 | int ret; |
1ae39938 | 8063 | int async_submit = 0; |
e65e1535 | 8064 | |
4f024f37 | 8065 | map_length = orig_bio->bi_iter.bi_size; |
53b381b3 | 8066 | ret = btrfs_map_block(root->fs_info, rw, start_sector << 9, |
e65e1535 | 8067 | &map_length, NULL, 0); |
7a5c3c9b | 8068 | if (ret) |
e65e1535 | 8069 | return -EIO; |
facc8a22 | 8070 | |
4f024f37 | 8071 | if (map_length >= orig_bio->bi_iter.bi_size) { |
02f57c7a | 8072 | bio = orig_bio; |
c1dc0896 | 8073 | dip->flags |= BTRFS_DIO_ORIG_BIO_SUBMITTED; |
02f57c7a JB |
8074 | goto submit; |
8075 | } | |
8076 | ||
53b381b3 | 8077 | /* async crcs make it difficult to collect full stripe writes. */ |
ffe2d203 | 8078 | if (btrfs_get_alloc_profile(root, 1) & BTRFS_BLOCK_GROUP_RAID56_MASK) |
53b381b3 DW |
8079 | async_submit = 0; |
8080 | else | |
8081 | async_submit = 1; | |
8082 | ||
02f57c7a JB |
8083 | bio = btrfs_dio_bio_alloc(orig_bio->bi_bdev, start_sector, GFP_NOFS); |
8084 | if (!bio) | |
8085 | return -ENOMEM; | |
7a5c3c9b | 8086 | |
02f57c7a JB |
8087 | bio->bi_private = dip; |
8088 | bio->bi_end_io = btrfs_end_dio_bio; | |
c1dc0896 | 8089 | btrfs_io_bio(bio)->logical = file_offset; |
02f57c7a JB |
8090 | atomic_inc(&dip->pending_bios); |
8091 | ||
e65e1535 | 8092 | while (bvec <= (orig_bio->bi_io_vec + orig_bio->bi_vcnt - 1)) { |
ee39b432 | 8093 | if (map_length < submit_len + bvec->bv_len || |
e65e1535 | 8094 | bio_add_page(bio, bvec->bv_page, bvec->bv_len, |
ee39b432 | 8095 | bvec->bv_offset) < bvec->bv_len) { |
e65e1535 MX |
8096 | /* |
8097 | * inc the count before we submit the bio so | |
8098 | * we know the end IO handler won't happen before | |
8099 | * we inc the count. Otherwise, the dip might get freed | |
8100 | * before we're done setting it up | |
8101 | */ | |
8102 | atomic_inc(&dip->pending_bios); | |
8103 | ret = __btrfs_submit_dio_bio(bio, inode, rw, | |
8104 | file_offset, skip_sum, | |
c329861d | 8105 | async_submit); |
e65e1535 MX |
8106 | if (ret) { |
8107 | bio_put(bio); | |
8108 | atomic_dec(&dip->pending_bios); | |
8109 | goto out_err; | |
8110 | } | |
8111 | ||
e65e1535 MX |
8112 | start_sector += submit_len >> 9; |
8113 | file_offset += submit_len; | |
8114 | ||
8115 | submit_len = 0; | |
8116 | nr_pages = 0; | |
8117 | ||
8118 | bio = btrfs_dio_bio_alloc(orig_bio->bi_bdev, | |
8119 | start_sector, GFP_NOFS); | |
8120 | if (!bio) | |
8121 | goto out_err; | |
8122 | bio->bi_private = dip; | |
8123 | bio->bi_end_io = btrfs_end_dio_bio; | |
c1dc0896 | 8124 | btrfs_io_bio(bio)->logical = file_offset; |
e65e1535 | 8125 | |
4f024f37 | 8126 | map_length = orig_bio->bi_iter.bi_size; |
53b381b3 | 8127 | ret = btrfs_map_block(root->fs_info, rw, |
3ec706c8 | 8128 | start_sector << 9, |
e65e1535 MX |
8129 | &map_length, NULL, 0); |
8130 | if (ret) { | |
8131 | bio_put(bio); | |
8132 | goto out_err; | |
8133 | } | |
8134 | } else { | |
8135 | submit_len += bvec->bv_len; | |
67871254 | 8136 | nr_pages++; |
e65e1535 MX |
8137 | bvec++; |
8138 | } | |
8139 | } | |
8140 | ||
02f57c7a | 8141 | submit: |
e65e1535 | 8142 | ret = __btrfs_submit_dio_bio(bio, inode, rw, file_offset, skip_sum, |
c329861d | 8143 | async_submit); |
e65e1535 MX |
8144 | if (!ret) |
8145 | return 0; | |
8146 | ||
8147 | bio_put(bio); | |
8148 | out_err: | |
8149 | dip->errors = 1; | |
8150 | /* | |
8151 | * before atomic variable goto zero, we must | |
8152 | * make sure dip->errors is perceived to be set. | |
8153 | */ | |
4e857c58 | 8154 | smp_mb__before_atomic(); |
e65e1535 MX |
8155 | if (atomic_dec_and_test(&dip->pending_bios)) |
8156 | bio_io_error(dip->orig_bio); | |
8157 | ||
8158 | /* bio_end_io() will handle error, so we needn't return it */ | |
8159 | return 0; | |
8160 | } | |
8161 | ||
9be3395b CM |
8162 | static void btrfs_submit_direct(int rw, struct bio *dio_bio, |
8163 | struct inode *inode, loff_t file_offset) | |
4b46fce2 | 8164 | { |
61de718f FM |
8165 | struct btrfs_dio_private *dip = NULL; |
8166 | struct bio *io_bio = NULL; | |
23ea8e5a | 8167 | struct btrfs_io_bio *btrfs_bio; |
4b46fce2 | 8168 | int skip_sum; |
7b6d91da | 8169 | int write = rw & REQ_WRITE; |
4b46fce2 JB |
8170 | int ret = 0; |
8171 | ||
8172 | skip_sum = BTRFS_I(inode)->flags & BTRFS_INODE_NODATASUM; | |
8173 | ||
9be3395b | 8174 | io_bio = btrfs_bio_clone(dio_bio, GFP_NOFS); |
9be3395b CM |
8175 | if (!io_bio) { |
8176 | ret = -ENOMEM; | |
8177 | goto free_ordered; | |
8178 | } | |
8179 | ||
c1dc0896 | 8180 | dip = kzalloc(sizeof(*dip), GFP_NOFS); |
4b46fce2 JB |
8181 | if (!dip) { |
8182 | ret = -ENOMEM; | |
61de718f | 8183 | goto free_ordered; |
4b46fce2 | 8184 | } |
4b46fce2 | 8185 | |
9be3395b | 8186 | dip->private = dio_bio->bi_private; |
4b46fce2 JB |
8187 | dip->inode = inode; |
8188 | dip->logical_offset = file_offset; | |
4f024f37 KO |
8189 | dip->bytes = dio_bio->bi_iter.bi_size; |
8190 | dip->disk_bytenr = (u64)dio_bio->bi_iter.bi_sector << 9; | |
9be3395b | 8191 | io_bio->bi_private = dip; |
9be3395b CM |
8192 | dip->orig_bio = io_bio; |
8193 | dip->dio_bio = dio_bio; | |
e65e1535 | 8194 | atomic_set(&dip->pending_bios, 0); |
c1dc0896 MX |
8195 | btrfs_bio = btrfs_io_bio(io_bio); |
8196 | btrfs_bio->logical = file_offset; | |
4b46fce2 | 8197 | |
c1dc0896 | 8198 | if (write) { |
9be3395b | 8199 | io_bio->bi_end_io = btrfs_endio_direct_write; |
c1dc0896 | 8200 | } else { |
9be3395b | 8201 | io_bio->bi_end_io = btrfs_endio_direct_read; |
c1dc0896 MX |
8202 | dip->subio_endio = btrfs_subio_endio_read; |
8203 | } | |
4b46fce2 | 8204 | |
e65e1535 MX |
8205 | ret = btrfs_submit_direct_hook(rw, dip, skip_sum); |
8206 | if (!ret) | |
eaf25d93 | 8207 | return; |
9be3395b | 8208 | |
23ea8e5a MX |
8209 | if (btrfs_bio->end_io) |
8210 | btrfs_bio->end_io(btrfs_bio, ret); | |
9be3395b | 8211 | |
4b46fce2 JB |
8212 | free_ordered: |
8213 | /* | |
61de718f FM |
8214 | * If we arrived here it means either we failed to submit the dip |
8215 | * or we either failed to clone the dio_bio or failed to allocate the | |
8216 | * dip. If we cloned the dio_bio and allocated the dip, we can just | |
8217 | * call bio_endio against our io_bio so that we get proper resource | |
8218 | * cleanup if we fail to submit the dip, otherwise, we must do the | |
8219 | * same as btrfs_endio_direct_[write|read] because we can't call these | |
8220 | * callbacks - they require an allocated dip and a clone of dio_bio. | |
4b46fce2 | 8221 | */ |
61de718f FM |
8222 | if (io_bio && dip) { |
8223 | bio_endio(io_bio, ret); | |
8224 | /* | |
8225 | * The end io callbacks free our dip, do the final put on io_bio | |
8226 | * and all the cleanup and final put for dio_bio (through | |
8227 | * dio_end_io()). | |
8228 | */ | |
8229 | dip = NULL; | |
8230 | io_bio = NULL; | |
8231 | } else { | |
8232 | if (write) { | |
8233 | struct btrfs_ordered_extent *ordered; | |
8234 | ||
8235 | ordered = btrfs_lookup_ordered_extent(inode, | |
8236 | file_offset); | |
8237 | set_bit(BTRFS_ORDERED_IOERR, &ordered->flags); | |
8238 | /* | |
8239 | * Decrements our ref on the ordered extent and removes | |
8240 | * the ordered extent from the inode's ordered tree, | |
8241 | * doing all the proper resource cleanup such as for the | |
8242 | * reserved space and waking up any waiters for this | |
8243 | * ordered extent (through btrfs_remove_ordered_extent). | |
8244 | */ | |
8245 | btrfs_finish_ordered_io(ordered); | |
8246 | } else { | |
8247 | unlock_extent(&BTRFS_I(inode)->io_tree, file_offset, | |
8248 | file_offset + dio_bio->bi_iter.bi_size - 1); | |
8249 | } | |
8250 | clear_bit(BIO_UPTODATE, &dio_bio->bi_flags); | |
8251 | /* | |
8252 | * Releases and cleans up our dio_bio, no need to bio_put() | |
8253 | * nor bio_endio()/bio_io_error() against dio_bio. | |
8254 | */ | |
8255 | dio_end_io(dio_bio, ret); | |
4b46fce2 | 8256 | } |
61de718f FM |
8257 | if (io_bio) |
8258 | bio_put(io_bio); | |
8259 | kfree(dip); | |
4b46fce2 JB |
8260 | } |
8261 | ||
6f673763 | 8262 | static ssize_t check_direct_IO(struct btrfs_root *root, struct kiocb *iocb, |
28060d5d | 8263 | const struct iov_iter *iter, loff_t offset) |
5a5f79b5 CM |
8264 | { |
8265 | int seg; | |
a1b75f7d | 8266 | int i; |
5a5f79b5 CM |
8267 | unsigned blocksize_mask = root->sectorsize - 1; |
8268 | ssize_t retval = -EINVAL; | |
5a5f79b5 CM |
8269 | |
8270 | if (offset & blocksize_mask) | |
8271 | goto out; | |
8272 | ||
28060d5d AV |
8273 | if (iov_iter_alignment(iter) & blocksize_mask) |
8274 | goto out; | |
a1b75f7d | 8275 | |
28060d5d | 8276 | /* If this is a write we don't need to check anymore */ |
6f673763 | 8277 | if (iov_iter_rw(iter) == WRITE) |
28060d5d AV |
8278 | return 0; |
8279 | /* | |
8280 | * Check to make sure we don't have duplicate iov_base's in this | |
8281 | * iovec, if so return EINVAL, otherwise we'll get csum errors | |
8282 | * when reading back. | |
8283 | */ | |
8284 | for (seg = 0; seg < iter->nr_segs; seg++) { | |
8285 | for (i = seg + 1; i < iter->nr_segs; i++) { | |
8286 | if (iter->iov[seg].iov_base == iter->iov[i].iov_base) | |
a1b75f7d JB |
8287 | goto out; |
8288 | } | |
5a5f79b5 CM |
8289 | } |
8290 | retval = 0; | |
8291 | out: | |
8292 | return retval; | |
8293 | } | |
eb838e73 | 8294 | |
22c6186e OS |
8295 | static ssize_t btrfs_direct_IO(struct kiocb *iocb, struct iov_iter *iter, |
8296 | loff_t offset) | |
16432985 | 8297 | { |
4b46fce2 JB |
8298 | struct file *file = iocb->ki_filp; |
8299 | struct inode *inode = file->f_mapping->host; | |
e1cbbfa5 | 8300 | u64 outstanding_extents = 0; |
0934856d | 8301 | size_t count = 0; |
2e60a51e | 8302 | int flags = 0; |
38851cc1 MX |
8303 | bool wakeup = true; |
8304 | bool relock = false; | |
0934856d | 8305 | ssize_t ret; |
4b46fce2 | 8306 | |
6f673763 | 8307 | if (check_direct_IO(BTRFS_I(inode)->root, iocb, iter, offset)) |
5a5f79b5 | 8308 | return 0; |
3f7c579c | 8309 | |
fe0f07d0 | 8310 | inode_dio_begin(inode); |
4e857c58 | 8311 | smp_mb__after_atomic(); |
38851cc1 | 8312 | |
0e267c44 | 8313 | /* |
41bd9ca4 MX |
8314 | * The generic stuff only does filemap_write_and_wait_range, which |
8315 | * isn't enough if we've written compressed pages to this area, so | |
8316 | * we need to flush the dirty pages again to make absolutely sure | |
8317 | * that any outstanding dirty pages are on disk. | |
0e267c44 | 8318 | */ |
a6cbcd4a | 8319 | count = iov_iter_count(iter); |
41bd9ca4 MX |
8320 | if (test_bit(BTRFS_INODE_HAS_ASYNC_EXTENT, |
8321 | &BTRFS_I(inode)->runtime_flags)) | |
9a025a08 WS |
8322 | filemap_fdatawrite_range(inode->i_mapping, offset, |
8323 | offset + count - 1); | |
0e267c44 | 8324 | |
6f673763 | 8325 | if (iov_iter_rw(iter) == WRITE) { |
38851cc1 MX |
8326 | /* |
8327 | * If the write DIO is beyond the EOF, we need update | |
8328 | * the isize, but it is protected by i_mutex. So we can | |
8329 | * not unlock the i_mutex at this case. | |
8330 | */ | |
8331 | if (offset + count <= inode->i_size) { | |
8332 | mutex_unlock(&inode->i_mutex); | |
8333 | relock = true; | |
8334 | } | |
0934856d MX |
8335 | ret = btrfs_delalloc_reserve_space(inode, count); |
8336 | if (ret) | |
38851cc1 | 8337 | goto out; |
e1cbbfa5 JB |
8338 | outstanding_extents = div64_u64(count + |
8339 | BTRFS_MAX_EXTENT_SIZE - 1, | |
8340 | BTRFS_MAX_EXTENT_SIZE); | |
8341 | ||
8342 | /* | |
8343 | * We need to know how many extents we reserved so that we can | |
8344 | * do the accounting properly if we go over the number we | |
8345 | * originally calculated. Abuse current->journal_info for this. | |
8346 | */ | |
8347 | current->journal_info = &outstanding_extents; | |
ee39b432 DS |
8348 | } else if (test_bit(BTRFS_INODE_READDIO_NEED_LOCK, |
8349 | &BTRFS_I(inode)->runtime_flags)) { | |
fe0f07d0 | 8350 | inode_dio_end(inode); |
38851cc1 MX |
8351 | flags = DIO_LOCKING | DIO_SKIP_HOLES; |
8352 | wakeup = false; | |
0934856d MX |
8353 | } |
8354 | ||
17f8c842 OS |
8355 | ret = __blockdev_direct_IO(iocb, inode, |
8356 | BTRFS_I(inode)->root->fs_info->fs_devices->latest_bdev, | |
8357 | iter, offset, btrfs_get_blocks_direct, NULL, | |
8358 | btrfs_submit_direct, flags); | |
6f673763 | 8359 | if (iov_iter_rw(iter) == WRITE) { |
e1cbbfa5 | 8360 | current->journal_info = NULL; |
ddba1bfc LB |
8361 | if (ret < 0 && ret != -EIOCBQUEUED) { |
8362 | /* | |
8363 | * If the error comes from submitting stage, | |
8364 | * btrfs_get_blocsk_direct() has free'd data space, | |
8365 | * and metadata space will be handled by | |
8366 | * finish_ordered_fn, don't do that again to make | |
8367 | * sure bytes_may_use is correct. | |
8368 | */ | |
8369 | if (!test_and_clear_bit(BTRFS_INODE_DIO_READY, | |
8370 | &BTRFS_I(inode)->runtime_flags)) | |
8371 | btrfs_delalloc_release_space(inode, count); | |
8372 | } else if (ret >= 0 && (size_t)ret < count) | |
0934856d MX |
8373 | btrfs_delalloc_release_space(inode, |
8374 | count - (size_t)ret); | |
0934856d | 8375 | } |
38851cc1 | 8376 | out: |
2e60a51e | 8377 | if (wakeup) |
fe0f07d0 | 8378 | inode_dio_end(inode); |
38851cc1 MX |
8379 | if (relock) |
8380 | mutex_lock(&inode->i_mutex); | |
0934856d MX |
8381 | |
8382 | return ret; | |
16432985 CM |
8383 | } |
8384 | ||
05dadc09 TI |
8385 | #define BTRFS_FIEMAP_FLAGS (FIEMAP_FLAG_SYNC) |
8386 | ||
1506fcc8 YS |
8387 | static int btrfs_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, |
8388 | __u64 start, __u64 len) | |
8389 | { | |
05dadc09 TI |
8390 | int ret; |
8391 | ||
8392 | ret = fiemap_check_flags(fieinfo, BTRFS_FIEMAP_FLAGS); | |
8393 | if (ret) | |
8394 | return ret; | |
8395 | ||
ec29ed5b | 8396 | return extent_fiemap(inode, fieinfo, start, len, btrfs_get_extent_fiemap); |
1506fcc8 YS |
8397 | } |
8398 | ||
a52d9a80 | 8399 | int btrfs_readpage(struct file *file, struct page *page) |
9ebefb18 | 8400 | { |
d1310b2e CM |
8401 | struct extent_io_tree *tree; |
8402 | tree = &BTRFS_I(page->mapping->host)->io_tree; | |
8ddc7d9c | 8403 | return extent_read_full_page(tree, page, btrfs_get_extent, 0); |
9ebefb18 | 8404 | } |
1832a6d5 | 8405 | |
a52d9a80 | 8406 | static int btrfs_writepage(struct page *page, struct writeback_control *wbc) |
39279cc3 | 8407 | { |
d1310b2e | 8408 | struct extent_io_tree *tree; |
b888db2b CM |
8409 | |
8410 | ||
8411 | if (current->flags & PF_MEMALLOC) { | |
8412 | redirty_page_for_writepage(wbc, page); | |
8413 | unlock_page(page); | |
8414 | return 0; | |
8415 | } | |
d1310b2e | 8416 | tree = &BTRFS_I(page->mapping->host)->io_tree; |
a52d9a80 | 8417 | return extent_write_full_page(tree, page, btrfs_get_extent, wbc); |
9ebefb18 CM |
8418 | } |
8419 | ||
48a3b636 ES |
8420 | static int btrfs_writepages(struct address_space *mapping, |
8421 | struct writeback_control *wbc) | |
b293f02e | 8422 | { |
d1310b2e | 8423 | struct extent_io_tree *tree; |
771ed689 | 8424 | |
d1310b2e | 8425 | tree = &BTRFS_I(mapping->host)->io_tree; |
b293f02e CM |
8426 | return extent_writepages(tree, mapping, btrfs_get_extent, wbc); |
8427 | } | |
8428 | ||
3ab2fb5a CM |
8429 | static int |
8430 | btrfs_readpages(struct file *file, struct address_space *mapping, | |
8431 | struct list_head *pages, unsigned nr_pages) | |
8432 | { | |
d1310b2e CM |
8433 | struct extent_io_tree *tree; |
8434 | tree = &BTRFS_I(mapping->host)->io_tree; | |
3ab2fb5a CM |
8435 | return extent_readpages(tree, mapping, pages, nr_pages, |
8436 | btrfs_get_extent); | |
8437 | } | |
e6dcd2dc | 8438 | static int __btrfs_releasepage(struct page *page, gfp_t gfp_flags) |
9ebefb18 | 8439 | { |
d1310b2e CM |
8440 | struct extent_io_tree *tree; |
8441 | struct extent_map_tree *map; | |
a52d9a80 | 8442 | int ret; |
8c2383c3 | 8443 | |
d1310b2e CM |
8444 | tree = &BTRFS_I(page->mapping->host)->io_tree; |
8445 | map = &BTRFS_I(page->mapping->host)->extent_tree; | |
70dec807 | 8446 | ret = try_release_extent_mapping(map, tree, page, gfp_flags); |
a52d9a80 CM |
8447 | if (ret == 1) { |
8448 | ClearPagePrivate(page); | |
8449 | set_page_private(page, 0); | |
8450 | page_cache_release(page); | |
39279cc3 | 8451 | } |
a52d9a80 | 8452 | return ret; |
39279cc3 CM |
8453 | } |
8454 | ||
e6dcd2dc CM |
8455 | static int btrfs_releasepage(struct page *page, gfp_t gfp_flags) |
8456 | { | |
98509cfc CM |
8457 | if (PageWriteback(page) || PageDirty(page)) |
8458 | return 0; | |
b335b003 | 8459 | return __btrfs_releasepage(page, gfp_flags & GFP_NOFS); |
e6dcd2dc CM |
8460 | } |
8461 | ||
d47992f8 LC |
8462 | static void btrfs_invalidatepage(struct page *page, unsigned int offset, |
8463 | unsigned int length) | |
39279cc3 | 8464 | { |
5fd02043 | 8465 | struct inode *inode = page->mapping->host; |
d1310b2e | 8466 | struct extent_io_tree *tree; |
e6dcd2dc | 8467 | struct btrfs_ordered_extent *ordered; |
2ac55d41 | 8468 | struct extent_state *cached_state = NULL; |
e6dcd2dc CM |
8469 | u64 page_start = page_offset(page); |
8470 | u64 page_end = page_start + PAGE_CACHE_SIZE - 1; | |
131e404a | 8471 | int inode_evicting = inode->i_state & I_FREEING; |
39279cc3 | 8472 | |
8b62b72b CM |
8473 | /* |
8474 | * we have the page locked, so new writeback can't start, | |
8475 | * and the dirty bit won't be cleared while we are here. | |
8476 | * | |
8477 | * Wait for IO on this page so that we can safely clear | |
8478 | * the PagePrivate2 bit and do ordered accounting | |
8479 | */ | |
e6dcd2dc | 8480 | wait_on_page_writeback(page); |
8b62b72b | 8481 | |
5fd02043 | 8482 | tree = &BTRFS_I(inode)->io_tree; |
e6dcd2dc CM |
8483 | if (offset) { |
8484 | btrfs_releasepage(page, GFP_NOFS); | |
8485 | return; | |
8486 | } | |
131e404a FDBM |
8487 | |
8488 | if (!inode_evicting) | |
8489 | lock_extent_bits(tree, page_start, page_end, 0, &cached_state); | |
8490 | ordered = btrfs_lookup_ordered_extent(inode, page_start); | |
e6dcd2dc | 8491 | if (ordered) { |
eb84ae03 CM |
8492 | /* |
8493 | * IO on this page will never be started, so we need | |
8494 | * to account for any ordered extents now | |
8495 | */ | |
131e404a FDBM |
8496 | if (!inode_evicting) |
8497 | clear_extent_bit(tree, page_start, page_end, | |
8498 | EXTENT_DIRTY | EXTENT_DELALLOC | | |
8499 | EXTENT_LOCKED | EXTENT_DO_ACCOUNTING | | |
8500 | EXTENT_DEFRAG, 1, 0, &cached_state, | |
8501 | GFP_NOFS); | |
8b62b72b CM |
8502 | /* |
8503 | * whoever cleared the private bit is responsible | |
8504 | * for the finish_ordered_io | |
8505 | */ | |
77cef2ec JB |
8506 | if (TestClearPagePrivate2(page)) { |
8507 | struct btrfs_ordered_inode_tree *tree; | |
8508 | u64 new_len; | |
8509 | ||
8510 | tree = &BTRFS_I(inode)->ordered_tree; | |
8511 | ||
8512 | spin_lock_irq(&tree->lock); | |
8513 | set_bit(BTRFS_ORDERED_TRUNCATED, &ordered->flags); | |
8514 | new_len = page_start - ordered->file_offset; | |
8515 | if (new_len < ordered->truncated_len) | |
8516 | ordered->truncated_len = new_len; | |
8517 | spin_unlock_irq(&tree->lock); | |
8518 | ||
8519 | if (btrfs_dec_test_ordered_pending(inode, &ordered, | |
8520 | page_start, | |
8521 | PAGE_CACHE_SIZE, 1)) | |
8522 | btrfs_finish_ordered_io(ordered); | |
8b62b72b | 8523 | } |
e6dcd2dc | 8524 | btrfs_put_ordered_extent(ordered); |
131e404a FDBM |
8525 | if (!inode_evicting) { |
8526 | cached_state = NULL; | |
8527 | lock_extent_bits(tree, page_start, page_end, 0, | |
8528 | &cached_state); | |
8529 | } | |
8530 | } | |
8531 | ||
8532 | if (!inode_evicting) { | |
8533 | clear_extent_bit(tree, page_start, page_end, | |
8534 | EXTENT_LOCKED | EXTENT_DIRTY | | |
8535 | EXTENT_DELALLOC | EXTENT_DO_ACCOUNTING | | |
8536 | EXTENT_DEFRAG, 1, 1, | |
8537 | &cached_state, GFP_NOFS); | |
8538 | ||
8539 | __btrfs_releasepage(page, GFP_NOFS); | |
e6dcd2dc | 8540 | } |
e6dcd2dc | 8541 | |
4a096752 | 8542 | ClearPageChecked(page); |
9ad6b7bc | 8543 | if (PagePrivate(page)) { |
9ad6b7bc CM |
8544 | ClearPagePrivate(page); |
8545 | set_page_private(page, 0); | |
8546 | page_cache_release(page); | |
8547 | } | |
39279cc3 CM |
8548 | } |
8549 | ||
9ebefb18 CM |
8550 | /* |
8551 | * btrfs_page_mkwrite() is not allowed to change the file size as it gets | |
8552 | * called from a page fault handler when a page is first dirtied. Hence we must | |
8553 | * be careful to check for EOF conditions here. We set the page up correctly | |
8554 | * for a written page which means we get ENOSPC checking when writing into | |
8555 | * holes and correct delalloc and unwritten extent mapping on filesystems that | |
8556 | * support these features. | |
8557 | * | |
8558 | * We are not allowed to take the i_mutex here so we have to play games to | |
8559 | * protect against truncate races as the page could now be beyond EOF. Because | |
8560 | * vmtruncate() writes the inode size before removing pages, once we have the | |
8561 | * page lock we can determine safely if the page is beyond EOF. If it is not | |
8562 | * beyond EOF, then the page is guaranteed safe against truncation until we | |
8563 | * unlock the page. | |
8564 | */ | |
c2ec175c | 8565 | int btrfs_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf) |
9ebefb18 | 8566 | { |
c2ec175c | 8567 | struct page *page = vmf->page; |
496ad9aa | 8568 | struct inode *inode = file_inode(vma->vm_file); |
1832a6d5 | 8569 | struct btrfs_root *root = BTRFS_I(inode)->root; |
e6dcd2dc CM |
8570 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; |
8571 | struct btrfs_ordered_extent *ordered; | |
2ac55d41 | 8572 | struct extent_state *cached_state = NULL; |
e6dcd2dc CM |
8573 | char *kaddr; |
8574 | unsigned long zero_start; | |
9ebefb18 | 8575 | loff_t size; |
1832a6d5 | 8576 | int ret; |
9998eb70 | 8577 | int reserved = 0; |
a52d9a80 | 8578 | u64 page_start; |
e6dcd2dc | 8579 | u64 page_end; |
9ebefb18 | 8580 | |
b2b5ef5c | 8581 | sb_start_pagefault(inode->i_sb); |
0ca1f7ce | 8582 | ret = btrfs_delalloc_reserve_space(inode, PAGE_CACHE_SIZE); |
9998eb70 | 8583 | if (!ret) { |
e41f941a | 8584 | ret = file_update_time(vma->vm_file); |
9998eb70 CM |
8585 | reserved = 1; |
8586 | } | |
56a76f82 NP |
8587 | if (ret) { |
8588 | if (ret == -ENOMEM) | |
8589 | ret = VM_FAULT_OOM; | |
8590 | else /* -ENOSPC, -EIO, etc */ | |
8591 | ret = VM_FAULT_SIGBUS; | |
9998eb70 CM |
8592 | if (reserved) |
8593 | goto out; | |
8594 | goto out_noreserve; | |
56a76f82 | 8595 | } |
1832a6d5 | 8596 | |
56a76f82 | 8597 | ret = VM_FAULT_NOPAGE; /* make the VM retry the fault */ |
e6dcd2dc | 8598 | again: |
9ebefb18 | 8599 | lock_page(page); |
9ebefb18 | 8600 | size = i_size_read(inode); |
e6dcd2dc CM |
8601 | page_start = page_offset(page); |
8602 | page_end = page_start + PAGE_CACHE_SIZE - 1; | |
a52d9a80 | 8603 | |
9ebefb18 | 8604 | if ((page->mapping != inode->i_mapping) || |
e6dcd2dc | 8605 | (page_start >= size)) { |
9ebefb18 CM |
8606 | /* page got truncated out from underneath us */ |
8607 | goto out_unlock; | |
8608 | } | |
e6dcd2dc CM |
8609 | wait_on_page_writeback(page); |
8610 | ||
d0082371 | 8611 | lock_extent_bits(io_tree, page_start, page_end, 0, &cached_state); |
e6dcd2dc CM |
8612 | set_page_extent_mapped(page); |
8613 | ||
eb84ae03 CM |
8614 | /* |
8615 | * we can't set the delalloc bits if there are pending ordered | |
8616 | * extents. Drop our locks and wait for them to finish | |
8617 | */ | |
e6dcd2dc CM |
8618 | ordered = btrfs_lookup_ordered_extent(inode, page_start); |
8619 | if (ordered) { | |
2ac55d41 JB |
8620 | unlock_extent_cached(io_tree, page_start, page_end, |
8621 | &cached_state, GFP_NOFS); | |
e6dcd2dc | 8622 | unlock_page(page); |
eb84ae03 | 8623 | btrfs_start_ordered_extent(inode, ordered, 1); |
e6dcd2dc CM |
8624 | btrfs_put_ordered_extent(ordered); |
8625 | goto again; | |
8626 | } | |
8627 | ||
fbf19087 JB |
8628 | /* |
8629 | * XXX - page_mkwrite gets called every time the page is dirtied, even | |
8630 | * if it was already dirty, so for space accounting reasons we need to | |
8631 | * clear any delalloc bits for the range we are fixing to save. There | |
8632 | * is probably a better way to do this, but for now keep consistent with | |
8633 | * prepare_pages in the normal write path. | |
8634 | */ | |
2ac55d41 | 8635 | clear_extent_bit(&BTRFS_I(inode)->io_tree, page_start, page_end, |
9e8a4a8b LB |
8636 | EXTENT_DIRTY | EXTENT_DELALLOC | |
8637 | EXTENT_DO_ACCOUNTING | EXTENT_DEFRAG, | |
2ac55d41 | 8638 | 0, 0, &cached_state, GFP_NOFS); |
fbf19087 | 8639 | |
2ac55d41 JB |
8640 | ret = btrfs_set_extent_delalloc(inode, page_start, page_end, |
8641 | &cached_state); | |
9ed74f2d | 8642 | if (ret) { |
2ac55d41 JB |
8643 | unlock_extent_cached(io_tree, page_start, page_end, |
8644 | &cached_state, GFP_NOFS); | |
9ed74f2d JB |
8645 | ret = VM_FAULT_SIGBUS; |
8646 | goto out_unlock; | |
8647 | } | |
e6dcd2dc | 8648 | ret = 0; |
9ebefb18 CM |
8649 | |
8650 | /* page is wholly or partially inside EOF */ | |
a52d9a80 | 8651 | if (page_start + PAGE_CACHE_SIZE > size) |
e6dcd2dc | 8652 | zero_start = size & ~PAGE_CACHE_MASK; |
9ebefb18 | 8653 | else |
e6dcd2dc | 8654 | zero_start = PAGE_CACHE_SIZE; |
9ebefb18 | 8655 | |
e6dcd2dc CM |
8656 | if (zero_start != PAGE_CACHE_SIZE) { |
8657 | kaddr = kmap(page); | |
8658 | memset(kaddr + zero_start, 0, PAGE_CACHE_SIZE - zero_start); | |
8659 | flush_dcache_page(page); | |
8660 | kunmap(page); | |
8661 | } | |
247e743c | 8662 | ClearPageChecked(page); |
e6dcd2dc | 8663 | set_page_dirty(page); |
50a9b214 | 8664 | SetPageUptodate(page); |
5a3f23d5 | 8665 | |
257c62e1 CM |
8666 | BTRFS_I(inode)->last_trans = root->fs_info->generation; |
8667 | BTRFS_I(inode)->last_sub_trans = BTRFS_I(inode)->root->log_transid; | |
46d8bc34 | 8668 | BTRFS_I(inode)->last_log_commit = BTRFS_I(inode)->root->last_log_commit; |
257c62e1 | 8669 | |
2ac55d41 | 8670 | unlock_extent_cached(io_tree, page_start, page_end, &cached_state, GFP_NOFS); |
9ebefb18 CM |
8671 | |
8672 | out_unlock: | |
b2b5ef5c JK |
8673 | if (!ret) { |
8674 | sb_end_pagefault(inode->i_sb); | |
50a9b214 | 8675 | return VM_FAULT_LOCKED; |
b2b5ef5c | 8676 | } |
9ebefb18 | 8677 | unlock_page(page); |
1832a6d5 | 8678 | out: |
ec39e180 | 8679 | btrfs_delalloc_release_space(inode, PAGE_CACHE_SIZE); |
9998eb70 | 8680 | out_noreserve: |
b2b5ef5c | 8681 | sb_end_pagefault(inode->i_sb); |
9ebefb18 CM |
8682 | return ret; |
8683 | } | |
8684 | ||
a41ad394 | 8685 | static int btrfs_truncate(struct inode *inode) |
39279cc3 CM |
8686 | { |
8687 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
fcb80c2a | 8688 | struct btrfs_block_rsv *rsv; |
a71754fc | 8689 | int ret = 0; |
3893e33b | 8690 | int err = 0; |
39279cc3 | 8691 | struct btrfs_trans_handle *trans; |
dbe674a9 | 8692 | u64 mask = root->sectorsize - 1; |
07127184 | 8693 | u64 min_size = btrfs_calc_trunc_metadata_size(root, 1); |
39279cc3 | 8694 | |
0ef8b726 JB |
8695 | ret = btrfs_wait_ordered_range(inode, inode->i_size & (~mask), |
8696 | (u64)-1); | |
8697 | if (ret) | |
8698 | return ret; | |
39279cc3 | 8699 | |
fcb80c2a JB |
8700 | /* |
8701 | * Yes ladies and gentelment, this is indeed ugly. The fact is we have | |
8702 | * 3 things going on here | |
8703 | * | |
8704 | * 1) We need to reserve space for our orphan item and the space to | |
8705 | * delete our orphan item. Lord knows we don't want to have a dangling | |
8706 | * orphan item because we didn't reserve space to remove it. | |
8707 | * | |
8708 | * 2) We need to reserve space to update our inode. | |
8709 | * | |
8710 | * 3) We need to have something to cache all the space that is going to | |
8711 | * be free'd up by the truncate operation, but also have some slack | |
8712 | * space reserved in case it uses space during the truncate (thank you | |
8713 | * very much snapshotting). | |
8714 | * | |
8715 | * And we need these to all be seperate. The fact is we can use alot of | |
8716 | * space doing the truncate, and we have no earthly idea how much space | |
8717 | * we will use, so we need the truncate reservation to be seperate so it | |
8718 | * doesn't end up using space reserved for updating the inode or | |
8719 | * removing the orphan item. We also need to be able to stop the | |
8720 | * transaction and start a new one, which means we need to be able to | |
8721 | * update the inode several times, and we have no idea of knowing how | |
8722 | * many times that will be, so we can't just reserve 1 item for the | |
8723 | * entirety of the opration, so that has to be done seperately as well. | |
8724 | * Then there is the orphan item, which does indeed need to be held on | |
8725 | * to for the whole operation, and we need nobody to touch this reserved | |
8726 | * space except the orphan code. | |
8727 | * | |
8728 | * So that leaves us with | |
8729 | * | |
8730 | * 1) root->orphan_block_rsv - for the orphan deletion. | |
8731 | * 2) rsv - for the truncate reservation, which we will steal from the | |
8732 | * transaction reservation. | |
8733 | * 3) fs_info->trans_block_rsv - this will have 1 items worth left for | |
8734 | * updating the inode. | |
8735 | */ | |
66d8f3dd | 8736 | rsv = btrfs_alloc_block_rsv(root, BTRFS_BLOCK_RSV_TEMP); |
fcb80c2a JB |
8737 | if (!rsv) |
8738 | return -ENOMEM; | |
4a338542 | 8739 | rsv->size = min_size; |
ca7e70f5 | 8740 | rsv->failfast = 1; |
f0cd846e | 8741 | |
907cbceb | 8742 | /* |
07127184 | 8743 | * 1 for the truncate slack space |
907cbceb JB |
8744 | * 1 for updating the inode. |
8745 | */ | |
f3fe820c | 8746 | trans = btrfs_start_transaction(root, 2); |
fcb80c2a JB |
8747 | if (IS_ERR(trans)) { |
8748 | err = PTR_ERR(trans); | |
8749 | goto out; | |
8750 | } | |
f0cd846e | 8751 | |
907cbceb JB |
8752 | /* Migrate the slack space for the truncate to our reserve */ |
8753 | ret = btrfs_block_rsv_migrate(&root->fs_info->trans_block_rsv, rsv, | |
8754 | min_size); | |
fcb80c2a | 8755 | BUG_ON(ret); |
f0cd846e | 8756 | |
5dc562c5 JB |
8757 | /* |
8758 | * So if we truncate and then write and fsync we normally would just | |
8759 | * write the extents that changed, which is a problem if we need to | |
8760 | * first truncate that entire inode. So set this flag so we write out | |
8761 | * all of the extents in the inode to the sync log so we're completely | |
8762 | * safe. | |
8763 | */ | |
8764 | set_bit(BTRFS_INODE_NEEDS_FULL_SYNC, &BTRFS_I(inode)->runtime_flags); | |
ca7e70f5 | 8765 | trans->block_rsv = rsv; |
907cbceb | 8766 | |
8082510e YZ |
8767 | while (1) { |
8768 | ret = btrfs_truncate_inode_items(trans, root, inode, | |
8769 | inode->i_size, | |
8770 | BTRFS_EXTENT_DATA_KEY); | |
28ed1345 | 8771 | if (ret != -ENOSPC && ret != -EAGAIN) { |
3893e33b | 8772 | err = ret; |
8082510e | 8773 | break; |
3893e33b | 8774 | } |
39279cc3 | 8775 | |
fcb80c2a | 8776 | trans->block_rsv = &root->fs_info->trans_block_rsv; |
8082510e | 8777 | ret = btrfs_update_inode(trans, root, inode); |
3893e33b JB |
8778 | if (ret) { |
8779 | err = ret; | |
8780 | break; | |
8781 | } | |
ca7e70f5 | 8782 | |
8082510e | 8783 | btrfs_end_transaction(trans, root); |
b53d3f5d | 8784 | btrfs_btree_balance_dirty(root); |
ca7e70f5 JB |
8785 | |
8786 | trans = btrfs_start_transaction(root, 2); | |
8787 | if (IS_ERR(trans)) { | |
8788 | ret = err = PTR_ERR(trans); | |
8789 | trans = NULL; | |
8790 | break; | |
8791 | } | |
8792 | ||
8793 | ret = btrfs_block_rsv_migrate(&root->fs_info->trans_block_rsv, | |
8794 | rsv, min_size); | |
8795 | BUG_ON(ret); /* shouldn't happen */ | |
8796 | trans->block_rsv = rsv; | |
8082510e YZ |
8797 | } |
8798 | ||
8799 | if (ret == 0 && inode->i_nlink > 0) { | |
fcb80c2a | 8800 | trans->block_rsv = root->orphan_block_rsv; |
8082510e | 8801 | ret = btrfs_orphan_del(trans, inode); |
3893e33b JB |
8802 | if (ret) |
8803 | err = ret; | |
8082510e YZ |
8804 | } |
8805 | ||
917c16b2 CM |
8806 | if (trans) { |
8807 | trans->block_rsv = &root->fs_info->trans_block_rsv; | |
8808 | ret = btrfs_update_inode(trans, root, inode); | |
8809 | if (ret && !err) | |
8810 | err = ret; | |
7b128766 | 8811 | |
7ad85bb7 | 8812 | ret = btrfs_end_transaction(trans, root); |
b53d3f5d | 8813 | btrfs_btree_balance_dirty(root); |
917c16b2 | 8814 | } |
fcb80c2a JB |
8815 | |
8816 | out: | |
8817 | btrfs_free_block_rsv(root, rsv); | |
8818 | ||
3893e33b JB |
8819 | if (ret && !err) |
8820 | err = ret; | |
a41ad394 | 8821 | |
3893e33b | 8822 | return err; |
39279cc3 CM |
8823 | } |
8824 | ||
d352ac68 CM |
8825 | /* |
8826 | * create a new subvolume directory/inode (helper for the ioctl). | |
8827 | */ | |
d2fb3437 | 8828 | int btrfs_create_subvol_root(struct btrfs_trans_handle *trans, |
63541927 FDBM |
8829 | struct btrfs_root *new_root, |
8830 | struct btrfs_root *parent_root, | |
8831 | u64 new_dirid) | |
39279cc3 | 8832 | { |
39279cc3 | 8833 | struct inode *inode; |
76dda93c | 8834 | int err; |
00e4e6b3 | 8835 | u64 index = 0; |
39279cc3 | 8836 | |
12fc9d09 FA |
8837 | inode = btrfs_new_inode(trans, new_root, NULL, "..", 2, |
8838 | new_dirid, new_dirid, | |
8839 | S_IFDIR | (~current_umask() & S_IRWXUGO), | |
8840 | &index); | |
54aa1f4d | 8841 | if (IS_ERR(inode)) |
f46b5a66 | 8842 | return PTR_ERR(inode); |
39279cc3 CM |
8843 | inode->i_op = &btrfs_dir_inode_operations; |
8844 | inode->i_fop = &btrfs_dir_file_operations; | |
8845 | ||
bfe86848 | 8846 | set_nlink(inode, 1); |
dbe674a9 | 8847 | btrfs_i_size_write(inode, 0); |
b0d5d10f | 8848 | unlock_new_inode(inode); |
3b96362c | 8849 | |
63541927 FDBM |
8850 | err = btrfs_subvol_inherit_props(trans, new_root, parent_root); |
8851 | if (err) | |
8852 | btrfs_err(new_root->fs_info, | |
351fd353 | 8853 | "error inheriting subvolume %llu properties: %d", |
63541927 FDBM |
8854 | new_root->root_key.objectid, err); |
8855 | ||
76dda93c | 8856 | err = btrfs_update_inode(trans, new_root, inode); |
cb8e7090 | 8857 | |
76dda93c | 8858 | iput(inode); |
ce598979 | 8859 | return err; |
39279cc3 CM |
8860 | } |
8861 | ||
39279cc3 CM |
8862 | struct inode *btrfs_alloc_inode(struct super_block *sb) |
8863 | { | |
8864 | struct btrfs_inode *ei; | |
2ead6ae7 | 8865 | struct inode *inode; |
39279cc3 CM |
8866 | |
8867 | ei = kmem_cache_alloc(btrfs_inode_cachep, GFP_NOFS); | |
8868 | if (!ei) | |
8869 | return NULL; | |
2ead6ae7 YZ |
8870 | |
8871 | ei->root = NULL; | |
2ead6ae7 | 8872 | ei->generation = 0; |
15ee9bc7 | 8873 | ei->last_trans = 0; |
257c62e1 | 8874 | ei->last_sub_trans = 0; |
e02119d5 | 8875 | ei->logged_trans = 0; |
2ead6ae7 | 8876 | ei->delalloc_bytes = 0; |
47059d93 | 8877 | ei->defrag_bytes = 0; |
2ead6ae7 YZ |
8878 | ei->disk_i_size = 0; |
8879 | ei->flags = 0; | |
7709cde3 | 8880 | ei->csum_bytes = 0; |
2ead6ae7 | 8881 | ei->index_cnt = (u64)-1; |
67de1176 | 8882 | ei->dir_index = 0; |
2ead6ae7 | 8883 | ei->last_unlink_trans = 0; |
46d8bc34 | 8884 | ei->last_log_commit = 0; |
2ead6ae7 | 8885 | |
9e0baf60 JB |
8886 | spin_lock_init(&ei->lock); |
8887 | ei->outstanding_extents = 0; | |
8888 | ei->reserved_extents = 0; | |
2ead6ae7 | 8889 | |
72ac3c0d | 8890 | ei->runtime_flags = 0; |
261507a0 | 8891 | ei->force_compress = BTRFS_COMPRESS_NONE; |
2ead6ae7 | 8892 | |
16cdcec7 MX |
8893 | ei->delayed_node = NULL; |
8894 | ||
9cc97d64 | 8895 | ei->i_otime.tv_sec = 0; |
8896 | ei->i_otime.tv_nsec = 0; | |
8897 | ||
2ead6ae7 | 8898 | inode = &ei->vfs_inode; |
a8067e02 | 8899 | extent_map_tree_init(&ei->extent_tree); |
f993c883 DS |
8900 | extent_io_tree_init(&ei->io_tree, &inode->i_data); |
8901 | extent_io_tree_init(&ei->io_failure_tree, &inode->i_data); | |
0b32f4bb JB |
8902 | ei->io_tree.track_uptodate = 1; |
8903 | ei->io_failure_tree.track_uptodate = 1; | |
b812ce28 | 8904 | atomic_set(&ei->sync_writers, 0); |
2ead6ae7 | 8905 | mutex_init(&ei->log_mutex); |
f248679e | 8906 | mutex_init(&ei->delalloc_mutex); |
e6dcd2dc | 8907 | btrfs_ordered_inode_tree_init(&ei->ordered_tree); |
2ead6ae7 | 8908 | INIT_LIST_HEAD(&ei->delalloc_inodes); |
2ead6ae7 YZ |
8909 | RB_CLEAR_NODE(&ei->rb_node); |
8910 | ||
8911 | return inode; | |
39279cc3 CM |
8912 | } |
8913 | ||
aaedb55b JB |
8914 | #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS |
8915 | void btrfs_test_destroy_inode(struct inode *inode) | |
8916 | { | |
8917 | btrfs_drop_extent_cache(inode, 0, (u64)-1, 0); | |
8918 | kmem_cache_free(btrfs_inode_cachep, BTRFS_I(inode)); | |
8919 | } | |
8920 | #endif | |
8921 | ||
fa0d7e3d NP |
8922 | static void btrfs_i_callback(struct rcu_head *head) |
8923 | { | |
8924 | struct inode *inode = container_of(head, struct inode, i_rcu); | |
fa0d7e3d NP |
8925 | kmem_cache_free(btrfs_inode_cachep, BTRFS_I(inode)); |
8926 | } | |
8927 | ||
39279cc3 CM |
8928 | void btrfs_destroy_inode(struct inode *inode) |
8929 | { | |
e6dcd2dc | 8930 | struct btrfs_ordered_extent *ordered; |
5a3f23d5 CM |
8931 | struct btrfs_root *root = BTRFS_I(inode)->root; |
8932 | ||
b3d9b7a3 | 8933 | WARN_ON(!hlist_empty(&inode->i_dentry)); |
39279cc3 | 8934 | WARN_ON(inode->i_data.nrpages); |
9e0baf60 JB |
8935 | WARN_ON(BTRFS_I(inode)->outstanding_extents); |
8936 | WARN_ON(BTRFS_I(inode)->reserved_extents); | |
7709cde3 JB |
8937 | WARN_ON(BTRFS_I(inode)->delalloc_bytes); |
8938 | WARN_ON(BTRFS_I(inode)->csum_bytes); | |
47059d93 | 8939 | WARN_ON(BTRFS_I(inode)->defrag_bytes); |
39279cc3 | 8940 | |
a6dbd429 JB |
8941 | /* |
8942 | * This can happen where we create an inode, but somebody else also | |
8943 | * created the same inode and we need to destroy the one we already | |
8944 | * created. | |
8945 | */ | |
8946 | if (!root) | |
8947 | goto free; | |
8948 | ||
8a35d95f JB |
8949 | if (test_bit(BTRFS_INODE_HAS_ORPHAN_ITEM, |
8950 | &BTRFS_I(inode)->runtime_flags)) { | |
c2cf52eb | 8951 | btrfs_info(root->fs_info, "inode %llu still on the orphan list", |
c1c9ff7c | 8952 | btrfs_ino(inode)); |
8a35d95f | 8953 | atomic_dec(&root->orphan_inodes); |
7b128766 | 8954 | } |
7b128766 | 8955 | |
d397712b | 8956 | while (1) { |
e6dcd2dc CM |
8957 | ordered = btrfs_lookup_first_ordered_extent(inode, (u64)-1); |
8958 | if (!ordered) | |
8959 | break; | |
8960 | else { | |
c2cf52eb | 8961 | btrfs_err(root->fs_info, "found ordered extent %llu %llu on inode cleanup", |
c1c9ff7c | 8962 | ordered->file_offset, ordered->len); |
e6dcd2dc CM |
8963 | btrfs_remove_ordered_extent(inode, ordered); |
8964 | btrfs_put_ordered_extent(ordered); | |
8965 | btrfs_put_ordered_extent(ordered); | |
8966 | } | |
8967 | } | |
5d4f98a2 | 8968 | inode_tree_del(inode); |
5b21f2ed | 8969 | btrfs_drop_extent_cache(inode, 0, (u64)-1, 0); |
a6dbd429 | 8970 | free: |
fa0d7e3d | 8971 | call_rcu(&inode->i_rcu, btrfs_i_callback); |
39279cc3 CM |
8972 | } |
8973 | ||
45321ac5 | 8974 | int btrfs_drop_inode(struct inode *inode) |
76dda93c YZ |
8975 | { |
8976 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
45321ac5 | 8977 | |
6379ef9f NA |
8978 | if (root == NULL) |
8979 | return 1; | |
8980 | ||
fa6ac876 | 8981 | /* the snap/subvol tree is on deleting */ |
69e9c6c6 | 8982 | if (btrfs_root_refs(&root->root_item) == 0) |
45321ac5 | 8983 | return 1; |
76dda93c | 8984 | else |
45321ac5 | 8985 | return generic_drop_inode(inode); |
76dda93c YZ |
8986 | } |
8987 | ||
0ee0fda0 | 8988 | static void init_once(void *foo) |
39279cc3 CM |
8989 | { |
8990 | struct btrfs_inode *ei = (struct btrfs_inode *) foo; | |
8991 | ||
8992 | inode_init_once(&ei->vfs_inode); | |
8993 | } | |
8994 | ||
8995 | void btrfs_destroy_cachep(void) | |
8996 | { | |
8c0a8537 KS |
8997 | /* |
8998 | * Make sure all delayed rcu free inodes are flushed before we | |
8999 | * destroy cache. | |
9000 | */ | |
9001 | rcu_barrier(); | |
39279cc3 CM |
9002 | if (btrfs_inode_cachep) |
9003 | kmem_cache_destroy(btrfs_inode_cachep); | |
9004 | if (btrfs_trans_handle_cachep) | |
9005 | kmem_cache_destroy(btrfs_trans_handle_cachep); | |
9006 | if (btrfs_transaction_cachep) | |
9007 | kmem_cache_destroy(btrfs_transaction_cachep); | |
39279cc3 CM |
9008 | if (btrfs_path_cachep) |
9009 | kmem_cache_destroy(btrfs_path_cachep); | |
dc89e982 JB |
9010 | if (btrfs_free_space_cachep) |
9011 | kmem_cache_destroy(btrfs_free_space_cachep); | |
8ccf6f19 MX |
9012 | if (btrfs_delalloc_work_cachep) |
9013 | kmem_cache_destroy(btrfs_delalloc_work_cachep); | |
39279cc3 CM |
9014 | } |
9015 | ||
9016 | int btrfs_init_cachep(void) | |
9017 | { | |
837e1972 | 9018 | btrfs_inode_cachep = kmem_cache_create("btrfs_inode", |
9601e3f6 CH |
9019 | sizeof(struct btrfs_inode), 0, |
9020 | SLAB_RECLAIM_ACCOUNT | SLAB_MEM_SPREAD, init_once); | |
39279cc3 CM |
9021 | if (!btrfs_inode_cachep) |
9022 | goto fail; | |
9601e3f6 | 9023 | |
837e1972 | 9024 | btrfs_trans_handle_cachep = kmem_cache_create("btrfs_trans_handle", |
9601e3f6 CH |
9025 | sizeof(struct btrfs_trans_handle), 0, |
9026 | SLAB_RECLAIM_ACCOUNT | SLAB_MEM_SPREAD, NULL); | |
39279cc3 CM |
9027 | if (!btrfs_trans_handle_cachep) |
9028 | goto fail; | |
9601e3f6 | 9029 | |
837e1972 | 9030 | btrfs_transaction_cachep = kmem_cache_create("btrfs_transaction", |
9601e3f6 CH |
9031 | sizeof(struct btrfs_transaction), 0, |
9032 | SLAB_RECLAIM_ACCOUNT | SLAB_MEM_SPREAD, NULL); | |
39279cc3 CM |
9033 | if (!btrfs_transaction_cachep) |
9034 | goto fail; | |
9601e3f6 | 9035 | |
837e1972 | 9036 | btrfs_path_cachep = kmem_cache_create("btrfs_path", |
9601e3f6 CH |
9037 | sizeof(struct btrfs_path), 0, |
9038 | SLAB_RECLAIM_ACCOUNT | SLAB_MEM_SPREAD, NULL); | |
39279cc3 CM |
9039 | if (!btrfs_path_cachep) |
9040 | goto fail; | |
9601e3f6 | 9041 | |
837e1972 | 9042 | btrfs_free_space_cachep = kmem_cache_create("btrfs_free_space", |
dc89e982 JB |
9043 | sizeof(struct btrfs_free_space), 0, |
9044 | SLAB_RECLAIM_ACCOUNT | SLAB_MEM_SPREAD, NULL); | |
9045 | if (!btrfs_free_space_cachep) | |
9046 | goto fail; | |
9047 | ||
8ccf6f19 MX |
9048 | btrfs_delalloc_work_cachep = kmem_cache_create("btrfs_delalloc_work", |
9049 | sizeof(struct btrfs_delalloc_work), 0, | |
9050 | SLAB_RECLAIM_ACCOUNT | SLAB_MEM_SPREAD, | |
9051 | NULL); | |
9052 | if (!btrfs_delalloc_work_cachep) | |
9053 | goto fail; | |
9054 | ||
39279cc3 CM |
9055 | return 0; |
9056 | fail: | |
9057 | btrfs_destroy_cachep(); | |
9058 | return -ENOMEM; | |
9059 | } | |
9060 | ||
9061 | static int btrfs_getattr(struct vfsmount *mnt, | |
9062 | struct dentry *dentry, struct kstat *stat) | |
9063 | { | |
df0af1a5 | 9064 | u64 delalloc_bytes; |
2b0143b5 | 9065 | struct inode *inode = d_inode(dentry); |
fadc0d8b DS |
9066 | u32 blocksize = inode->i_sb->s_blocksize; |
9067 | ||
39279cc3 | 9068 | generic_fillattr(inode, stat); |
0ee5dc67 | 9069 | stat->dev = BTRFS_I(inode)->root->anon_dev; |
d6667462 | 9070 | stat->blksize = PAGE_CACHE_SIZE; |
df0af1a5 MX |
9071 | |
9072 | spin_lock(&BTRFS_I(inode)->lock); | |
9073 | delalloc_bytes = BTRFS_I(inode)->delalloc_bytes; | |
9074 | spin_unlock(&BTRFS_I(inode)->lock); | |
fadc0d8b | 9075 | stat->blocks = (ALIGN(inode_get_bytes(inode), blocksize) + |
df0af1a5 | 9076 | ALIGN(delalloc_bytes, blocksize)) >> 9; |
39279cc3 CM |
9077 | return 0; |
9078 | } | |
9079 | ||
d397712b CM |
9080 | static int btrfs_rename(struct inode *old_dir, struct dentry *old_dentry, |
9081 | struct inode *new_dir, struct dentry *new_dentry) | |
39279cc3 CM |
9082 | { |
9083 | struct btrfs_trans_handle *trans; | |
9084 | struct btrfs_root *root = BTRFS_I(old_dir)->root; | |
4df27c4d | 9085 | struct btrfs_root *dest = BTRFS_I(new_dir)->root; |
2b0143b5 DH |
9086 | struct inode *new_inode = d_inode(new_dentry); |
9087 | struct inode *old_inode = d_inode(old_dentry); | |
39279cc3 | 9088 | struct timespec ctime = CURRENT_TIME; |
00e4e6b3 | 9089 | u64 index = 0; |
4df27c4d | 9090 | u64 root_objectid; |
39279cc3 | 9091 | int ret; |
33345d01 | 9092 | u64 old_ino = btrfs_ino(old_inode); |
39279cc3 | 9093 | |
33345d01 | 9094 | if (btrfs_ino(new_dir) == BTRFS_EMPTY_SUBVOL_DIR_OBJECTID) |
f679a840 YZ |
9095 | return -EPERM; |
9096 | ||
4df27c4d | 9097 | /* we only allow rename subvolume link between subvolumes */ |
33345d01 | 9098 | if (old_ino != BTRFS_FIRST_FREE_OBJECTID && root != dest) |
3394e160 CM |
9099 | return -EXDEV; |
9100 | ||
33345d01 LZ |
9101 | if (old_ino == BTRFS_EMPTY_SUBVOL_DIR_OBJECTID || |
9102 | (new_inode && btrfs_ino(new_inode) == BTRFS_FIRST_FREE_OBJECTID)) | |
39279cc3 | 9103 | return -ENOTEMPTY; |
5f39d397 | 9104 | |
4df27c4d YZ |
9105 | if (S_ISDIR(old_inode->i_mode) && new_inode && |
9106 | new_inode->i_size > BTRFS_EMPTY_DIR_SIZE) | |
9107 | return -ENOTEMPTY; | |
9c52057c CM |
9108 | |
9109 | ||
9110 | /* check for collisions, even if the name isn't there */ | |
4871c158 | 9111 | ret = btrfs_check_dir_item_collision(dest, new_dir->i_ino, |
9c52057c CM |
9112 | new_dentry->d_name.name, |
9113 | new_dentry->d_name.len); | |
9114 | ||
9115 | if (ret) { | |
9116 | if (ret == -EEXIST) { | |
9117 | /* we shouldn't get | |
9118 | * eexist without a new_inode */ | |
fae7f21c | 9119 | if (WARN_ON(!new_inode)) { |
9c52057c CM |
9120 | return ret; |
9121 | } | |
9122 | } else { | |
9123 | /* maybe -EOVERFLOW */ | |
9124 | return ret; | |
9125 | } | |
9126 | } | |
9127 | ret = 0; | |
9128 | ||
5a3f23d5 | 9129 | /* |
8d875f95 CM |
9130 | * we're using rename to replace one file with another. Start IO on it |
9131 | * now so we don't add too much work to the end of the transaction | |
5a3f23d5 | 9132 | */ |
8d875f95 | 9133 | if (new_inode && S_ISREG(old_inode->i_mode) && new_inode->i_size) |
5a3f23d5 CM |
9134 | filemap_flush(old_inode->i_mapping); |
9135 | ||
76dda93c | 9136 | /* close the racy window with snapshot create/destroy ioctl */ |
33345d01 | 9137 | if (old_ino == BTRFS_FIRST_FREE_OBJECTID) |
76dda93c | 9138 | down_read(&root->fs_info->subvol_sem); |
a22285a6 YZ |
9139 | /* |
9140 | * We want to reserve the absolute worst case amount of items. So if | |
9141 | * both inodes are subvols and we need to unlink them then that would | |
9142 | * require 4 item modifications, but if they are both normal inodes it | |
9143 | * would require 5 item modifications, so we'll assume their normal | |
9144 | * inodes. So 5 * 2 is 10, plus 1 for the new link, so 11 total items | |
9145 | * should cover the worst case number of items we'll modify. | |
9146 | */ | |
6e137ed3 | 9147 | trans = btrfs_start_transaction(root, 11); |
b44c59a8 JL |
9148 | if (IS_ERR(trans)) { |
9149 | ret = PTR_ERR(trans); | |
9150 | goto out_notrans; | |
9151 | } | |
76dda93c | 9152 | |
4df27c4d YZ |
9153 | if (dest != root) |
9154 | btrfs_record_root_in_trans(trans, dest); | |
5f39d397 | 9155 | |
a5719521 YZ |
9156 | ret = btrfs_set_inode_index(new_dir, &index); |
9157 | if (ret) | |
9158 | goto out_fail; | |
5a3f23d5 | 9159 | |
67de1176 | 9160 | BTRFS_I(old_inode)->dir_index = 0ULL; |
33345d01 | 9161 | if (unlikely(old_ino == BTRFS_FIRST_FREE_OBJECTID)) { |
4df27c4d | 9162 | /* force full log commit if subvolume involved. */ |
995946dd | 9163 | btrfs_set_log_full_commit(root->fs_info, trans); |
4df27c4d | 9164 | } else { |
a5719521 YZ |
9165 | ret = btrfs_insert_inode_ref(trans, dest, |
9166 | new_dentry->d_name.name, | |
9167 | new_dentry->d_name.len, | |
33345d01 LZ |
9168 | old_ino, |
9169 | btrfs_ino(new_dir), index); | |
a5719521 YZ |
9170 | if (ret) |
9171 | goto out_fail; | |
4df27c4d YZ |
9172 | /* |
9173 | * this is an ugly little race, but the rename is required | |
9174 | * to make sure that if we crash, the inode is either at the | |
9175 | * old name or the new one. pinning the log transaction lets | |
9176 | * us make sure we don't allow a log commit to come in after | |
9177 | * we unlink the name but before we add the new name back in. | |
9178 | */ | |
9179 | btrfs_pin_log_trans(root); | |
9180 | } | |
5a3f23d5 | 9181 | |
0c4d2d95 JB |
9182 | inode_inc_iversion(old_dir); |
9183 | inode_inc_iversion(new_dir); | |
9184 | inode_inc_iversion(old_inode); | |
39279cc3 CM |
9185 | old_dir->i_ctime = old_dir->i_mtime = ctime; |
9186 | new_dir->i_ctime = new_dir->i_mtime = ctime; | |
9187 | old_inode->i_ctime = ctime; | |
5f39d397 | 9188 | |
12fcfd22 CM |
9189 | if (old_dentry->d_parent != new_dentry->d_parent) |
9190 | btrfs_record_unlink_dir(trans, old_dir, old_inode, 1); | |
9191 | ||
33345d01 | 9192 | if (unlikely(old_ino == BTRFS_FIRST_FREE_OBJECTID)) { |
4df27c4d YZ |
9193 | root_objectid = BTRFS_I(old_inode)->root->root_key.objectid; |
9194 | ret = btrfs_unlink_subvol(trans, root, old_dir, root_objectid, | |
9195 | old_dentry->d_name.name, | |
9196 | old_dentry->d_name.len); | |
9197 | } else { | |
92986796 | 9198 | ret = __btrfs_unlink_inode(trans, root, old_dir, |
2b0143b5 | 9199 | d_inode(old_dentry), |
92986796 AV |
9200 | old_dentry->d_name.name, |
9201 | old_dentry->d_name.len); | |
9202 | if (!ret) | |
9203 | ret = btrfs_update_inode(trans, root, old_inode); | |
4df27c4d | 9204 | } |
79787eaa JM |
9205 | if (ret) { |
9206 | btrfs_abort_transaction(trans, root, ret); | |
9207 | goto out_fail; | |
9208 | } | |
39279cc3 CM |
9209 | |
9210 | if (new_inode) { | |
0c4d2d95 | 9211 | inode_inc_iversion(new_inode); |
39279cc3 | 9212 | new_inode->i_ctime = CURRENT_TIME; |
33345d01 | 9213 | if (unlikely(btrfs_ino(new_inode) == |
4df27c4d YZ |
9214 | BTRFS_EMPTY_SUBVOL_DIR_OBJECTID)) { |
9215 | root_objectid = BTRFS_I(new_inode)->location.objectid; | |
9216 | ret = btrfs_unlink_subvol(trans, dest, new_dir, | |
9217 | root_objectid, | |
9218 | new_dentry->d_name.name, | |
9219 | new_dentry->d_name.len); | |
9220 | BUG_ON(new_inode->i_nlink == 0); | |
9221 | } else { | |
9222 | ret = btrfs_unlink_inode(trans, dest, new_dir, | |
2b0143b5 | 9223 | d_inode(new_dentry), |
4df27c4d YZ |
9224 | new_dentry->d_name.name, |
9225 | new_dentry->d_name.len); | |
9226 | } | |
4ef31a45 | 9227 | if (!ret && new_inode->i_nlink == 0) |
2b0143b5 | 9228 | ret = btrfs_orphan_add(trans, d_inode(new_dentry)); |
79787eaa JM |
9229 | if (ret) { |
9230 | btrfs_abort_transaction(trans, root, ret); | |
9231 | goto out_fail; | |
9232 | } | |
39279cc3 | 9233 | } |
aec7477b | 9234 | |
4df27c4d YZ |
9235 | ret = btrfs_add_link(trans, new_dir, old_inode, |
9236 | new_dentry->d_name.name, | |
a5719521 | 9237 | new_dentry->d_name.len, 0, index); |
79787eaa JM |
9238 | if (ret) { |
9239 | btrfs_abort_transaction(trans, root, ret); | |
9240 | goto out_fail; | |
9241 | } | |
39279cc3 | 9242 | |
67de1176 MX |
9243 | if (old_inode->i_nlink == 1) |
9244 | BTRFS_I(old_inode)->dir_index = index; | |
9245 | ||
33345d01 | 9246 | if (old_ino != BTRFS_FIRST_FREE_OBJECTID) { |
10d9f309 | 9247 | struct dentry *parent = new_dentry->d_parent; |
6a912213 | 9248 | btrfs_log_new_name(trans, old_inode, old_dir, parent); |
4df27c4d YZ |
9249 | btrfs_end_log_trans(root); |
9250 | } | |
39279cc3 | 9251 | out_fail: |
7ad85bb7 | 9252 | btrfs_end_transaction(trans, root); |
b44c59a8 | 9253 | out_notrans: |
33345d01 | 9254 | if (old_ino == BTRFS_FIRST_FREE_OBJECTID) |
76dda93c | 9255 | up_read(&root->fs_info->subvol_sem); |
9ed74f2d | 9256 | |
39279cc3 CM |
9257 | return ret; |
9258 | } | |
9259 | ||
80ace85c MS |
9260 | static int btrfs_rename2(struct inode *old_dir, struct dentry *old_dentry, |
9261 | struct inode *new_dir, struct dentry *new_dentry, | |
9262 | unsigned int flags) | |
9263 | { | |
9264 | if (flags & ~RENAME_NOREPLACE) | |
9265 | return -EINVAL; | |
9266 | ||
9267 | return btrfs_rename(old_dir, old_dentry, new_dir, new_dentry); | |
9268 | } | |
9269 | ||
8ccf6f19 MX |
9270 | static void btrfs_run_delalloc_work(struct btrfs_work *work) |
9271 | { | |
9272 | struct btrfs_delalloc_work *delalloc_work; | |
9f23e289 | 9273 | struct inode *inode; |
8ccf6f19 MX |
9274 | |
9275 | delalloc_work = container_of(work, struct btrfs_delalloc_work, | |
9276 | work); | |
9f23e289 JB |
9277 | inode = delalloc_work->inode; |
9278 | if (delalloc_work->wait) { | |
9279 | btrfs_wait_ordered_range(inode, 0, (u64)-1); | |
9280 | } else { | |
9281 | filemap_flush(inode->i_mapping); | |
9282 | if (test_bit(BTRFS_INODE_HAS_ASYNC_EXTENT, | |
9283 | &BTRFS_I(inode)->runtime_flags)) | |
9284 | filemap_flush(inode->i_mapping); | |
9285 | } | |
8ccf6f19 MX |
9286 | |
9287 | if (delalloc_work->delay_iput) | |
9f23e289 | 9288 | btrfs_add_delayed_iput(inode); |
8ccf6f19 | 9289 | else |
9f23e289 | 9290 | iput(inode); |
8ccf6f19 MX |
9291 | complete(&delalloc_work->completion); |
9292 | } | |
9293 | ||
9294 | struct btrfs_delalloc_work *btrfs_alloc_delalloc_work(struct inode *inode, | |
9295 | int wait, int delay_iput) | |
9296 | { | |
9297 | struct btrfs_delalloc_work *work; | |
9298 | ||
9299 | work = kmem_cache_zalloc(btrfs_delalloc_work_cachep, GFP_NOFS); | |
9300 | if (!work) | |
9301 | return NULL; | |
9302 | ||
9303 | init_completion(&work->completion); | |
9304 | INIT_LIST_HEAD(&work->list); | |
9305 | work->inode = inode; | |
9306 | work->wait = wait; | |
9307 | work->delay_iput = delay_iput; | |
9e0af237 LB |
9308 | WARN_ON_ONCE(!inode); |
9309 | btrfs_init_work(&work->work, btrfs_flush_delalloc_helper, | |
9310 | btrfs_run_delalloc_work, NULL, NULL); | |
8ccf6f19 MX |
9311 | |
9312 | return work; | |
9313 | } | |
9314 | ||
9315 | void btrfs_wait_and_free_delalloc_work(struct btrfs_delalloc_work *work) | |
9316 | { | |
9317 | wait_for_completion(&work->completion); | |
9318 | kmem_cache_free(btrfs_delalloc_work_cachep, work); | |
9319 | } | |
9320 | ||
d352ac68 CM |
9321 | /* |
9322 | * some fairly slow code that needs optimization. This walks the list | |
9323 | * of all the inodes with pending delalloc and forces them to disk. | |
9324 | */ | |
6c255e67 MX |
9325 | static int __start_delalloc_inodes(struct btrfs_root *root, int delay_iput, |
9326 | int nr) | |
ea8c2819 | 9327 | { |
ea8c2819 | 9328 | struct btrfs_inode *binode; |
5b21f2ed | 9329 | struct inode *inode; |
8ccf6f19 MX |
9330 | struct btrfs_delalloc_work *work, *next; |
9331 | struct list_head works; | |
1eafa6c7 | 9332 | struct list_head splice; |
8ccf6f19 | 9333 | int ret = 0; |
ea8c2819 | 9334 | |
8ccf6f19 | 9335 | INIT_LIST_HEAD(&works); |
1eafa6c7 | 9336 | INIT_LIST_HEAD(&splice); |
63607cc8 | 9337 | |
573bfb72 | 9338 | mutex_lock(&root->delalloc_mutex); |
eb73c1b7 MX |
9339 | spin_lock(&root->delalloc_lock); |
9340 | list_splice_init(&root->delalloc_inodes, &splice); | |
1eafa6c7 MX |
9341 | while (!list_empty(&splice)) { |
9342 | binode = list_entry(splice.next, struct btrfs_inode, | |
ea8c2819 | 9343 | delalloc_inodes); |
1eafa6c7 | 9344 | |
eb73c1b7 MX |
9345 | list_move_tail(&binode->delalloc_inodes, |
9346 | &root->delalloc_inodes); | |
5b21f2ed | 9347 | inode = igrab(&binode->vfs_inode); |
df0af1a5 | 9348 | if (!inode) { |
eb73c1b7 | 9349 | cond_resched_lock(&root->delalloc_lock); |
1eafa6c7 | 9350 | continue; |
df0af1a5 | 9351 | } |
eb73c1b7 | 9352 | spin_unlock(&root->delalloc_lock); |
1eafa6c7 MX |
9353 | |
9354 | work = btrfs_alloc_delalloc_work(inode, 0, delay_iput); | |
5d99a998 | 9355 | if (!work) { |
f4ab9ea7 JB |
9356 | if (delay_iput) |
9357 | btrfs_add_delayed_iput(inode); | |
9358 | else | |
9359 | iput(inode); | |
1eafa6c7 | 9360 | ret = -ENOMEM; |
a1ecaabb | 9361 | goto out; |
5b21f2ed | 9362 | } |
1eafa6c7 | 9363 | list_add_tail(&work->list, &works); |
a44903ab QW |
9364 | btrfs_queue_work(root->fs_info->flush_workers, |
9365 | &work->work); | |
6c255e67 MX |
9366 | ret++; |
9367 | if (nr != -1 && ret >= nr) | |
a1ecaabb | 9368 | goto out; |
5b21f2ed | 9369 | cond_resched(); |
eb73c1b7 | 9370 | spin_lock(&root->delalloc_lock); |
ea8c2819 | 9371 | } |
eb73c1b7 | 9372 | spin_unlock(&root->delalloc_lock); |
8c8bee1d | 9373 | |
a1ecaabb | 9374 | out: |
eb73c1b7 MX |
9375 | list_for_each_entry_safe(work, next, &works, list) { |
9376 | list_del_init(&work->list); | |
9377 | btrfs_wait_and_free_delalloc_work(work); | |
9378 | } | |
9379 | ||
9380 | if (!list_empty_careful(&splice)) { | |
9381 | spin_lock(&root->delalloc_lock); | |
9382 | list_splice_tail(&splice, &root->delalloc_inodes); | |
9383 | spin_unlock(&root->delalloc_lock); | |
9384 | } | |
573bfb72 | 9385 | mutex_unlock(&root->delalloc_mutex); |
eb73c1b7 MX |
9386 | return ret; |
9387 | } | |
1eafa6c7 | 9388 | |
eb73c1b7 MX |
9389 | int btrfs_start_delalloc_inodes(struct btrfs_root *root, int delay_iput) |
9390 | { | |
9391 | int ret; | |
1eafa6c7 | 9392 | |
2c21b4d7 | 9393 | if (test_bit(BTRFS_FS_STATE_ERROR, &root->fs_info->fs_state)) |
eb73c1b7 MX |
9394 | return -EROFS; |
9395 | ||
6c255e67 MX |
9396 | ret = __start_delalloc_inodes(root, delay_iput, -1); |
9397 | if (ret > 0) | |
9398 | ret = 0; | |
eb73c1b7 MX |
9399 | /* |
9400 | * the filemap_flush will queue IO into the worker threads, but | |
8c8bee1d CM |
9401 | * we have to make sure the IO is actually started and that |
9402 | * ordered extents get created before we return | |
9403 | */ | |
9404 | atomic_inc(&root->fs_info->async_submit_draining); | |
d397712b | 9405 | while (atomic_read(&root->fs_info->nr_async_submits) || |
771ed689 | 9406 | atomic_read(&root->fs_info->async_delalloc_pages)) { |
8c8bee1d | 9407 | wait_event(root->fs_info->async_submit_wait, |
771ed689 CM |
9408 | (atomic_read(&root->fs_info->nr_async_submits) == 0 && |
9409 | atomic_read(&root->fs_info->async_delalloc_pages) == 0)); | |
8c8bee1d CM |
9410 | } |
9411 | atomic_dec(&root->fs_info->async_submit_draining); | |
eb73c1b7 MX |
9412 | return ret; |
9413 | } | |
9414 | ||
6c255e67 MX |
9415 | int btrfs_start_delalloc_roots(struct btrfs_fs_info *fs_info, int delay_iput, |
9416 | int nr) | |
eb73c1b7 MX |
9417 | { |
9418 | struct btrfs_root *root; | |
9419 | struct list_head splice; | |
9420 | int ret; | |
9421 | ||
2c21b4d7 | 9422 | if (test_bit(BTRFS_FS_STATE_ERROR, &fs_info->fs_state)) |
eb73c1b7 MX |
9423 | return -EROFS; |
9424 | ||
9425 | INIT_LIST_HEAD(&splice); | |
9426 | ||
573bfb72 | 9427 | mutex_lock(&fs_info->delalloc_root_mutex); |
eb73c1b7 MX |
9428 | spin_lock(&fs_info->delalloc_root_lock); |
9429 | list_splice_init(&fs_info->delalloc_roots, &splice); | |
6c255e67 | 9430 | while (!list_empty(&splice) && nr) { |
eb73c1b7 MX |
9431 | root = list_first_entry(&splice, struct btrfs_root, |
9432 | delalloc_root); | |
9433 | root = btrfs_grab_fs_root(root); | |
9434 | BUG_ON(!root); | |
9435 | list_move_tail(&root->delalloc_root, | |
9436 | &fs_info->delalloc_roots); | |
9437 | spin_unlock(&fs_info->delalloc_root_lock); | |
9438 | ||
6c255e67 | 9439 | ret = __start_delalloc_inodes(root, delay_iput, nr); |
eb73c1b7 | 9440 | btrfs_put_fs_root(root); |
6c255e67 | 9441 | if (ret < 0) |
eb73c1b7 MX |
9442 | goto out; |
9443 | ||
6c255e67 MX |
9444 | if (nr != -1) { |
9445 | nr -= ret; | |
9446 | WARN_ON(nr < 0); | |
9447 | } | |
eb73c1b7 | 9448 | spin_lock(&fs_info->delalloc_root_lock); |
8ccf6f19 | 9449 | } |
eb73c1b7 | 9450 | spin_unlock(&fs_info->delalloc_root_lock); |
1eafa6c7 | 9451 | |
6c255e67 | 9452 | ret = 0; |
eb73c1b7 MX |
9453 | atomic_inc(&fs_info->async_submit_draining); |
9454 | while (atomic_read(&fs_info->nr_async_submits) || | |
9455 | atomic_read(&fs_info->async_delalloc_pages)) { | |
9456 | wait_event(fs_info->async_submit_wait, | |
9457 | (atomic_read(&fs_info->nr_async_submits) == 0 && | |
9458 | atomic_read(&fs_info->async_delalloc_pages) == 0)); | |
9459 | } | |
9460 | atomic_dec(&fs_info->async_submit_draining); | |
eb73c1b7 | 9461 | out: |
1eafa6c7 | 9462 | if (!list_empty_careful(&splice)) { |
eb73c1b7 MX |
9463 | spin_lock(&fs_info->delalloc_root_lock); |
9464 | list_splice_tail(&splice, &fs_info->delalloc_roots); | |
9465 | spin_unlock(&fs_info->delalloc_root_lock); | |
1eafa6c7 | 9466 | } |
573bfb72 | 9467 | mutex_unlock(&fs_info->delalloc_root_mutex); |
8ccf6f19 | 9468 | return ret; |
ea8c2819 CM |
9469 | } |
9470 | ||
39279cc3 CM |
9471 | static int btrfs_symlink(struct inode *dir, struct dentry *dentry, |
9472 | const char *symname) | |
9473 | { | |
9474 | struct btrfs_trans_handle *trans; | |
9475 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
9476 | struct btrfs_path *path; | |
9477 | struct btrfs_key key; | |
1832a6d5 | 9478 | struct inode *inode = NULL; |
39279cc3 CM |
9479 | int err; |
9480 | int drop_inode = 0; | |
9481 | u64 objectid; | |
67871254 | 9482 | u64 index = 0; |
39279cc3 CM |
9483 | int name_len; |
9484 | int datasize; | |
5f39d397 | 9485 | unsigned long ptr; |
39279cc3 | 9486 | struct btrfs_file_extent_item *ei; |
5f39d397 | 9487 | struct extent_buffer *leaf; |
39279cc3 | 9488 | |
f06becc4 | 9489 | name_len = strlen(symname); |
39279cc3 CM |
9490 | if (name_len > BTRFS_MAX_INLINE_DATA_SIZE(root)) |
9491 | return -ENAMETOOLONG; | |
1832a6d5 | 9492 | |
9ed74f2d JB |
9493 | /* |
9494 | * 2 items for inode item and ref | |
9495 | * 2 items for dir items | |
9496 | * 1 item for xattr if selinux is on | |
9497 | */ | |
a22285a6 YZ |
9498 | trans = btrfs_start_transaction(root, 5); |
9499 | if (IS_ERR(trans)) | |
9500 | return PTR_ERR(trans); | |
1832a6d5 | 9501 | |
581bb050 LZ |
9502 | err = btrfs_find_free_ino(root, &objectid); |
9503 | if (err) | |
9504 | goto out_unlock; | |
9505 | ||
aec7477b | 9506 | inode = btrfs_new_inode(trans, root, dir, dentry->d_name.name, |
33345d01 | 9507 | dentry->d_name.len, btrfs_ino(dir), objectid, |
d82a6f1d | 9508 | S_IFLNK|S_IRWXUGO, &index); |
7cf96da3 TI |
9509 | if (IS_ERR(inode)) { |
9510 | err = PTR_ERR(inode); | |
39279cc3 | 9511 | goto out_unlock; |
7cf96da3 | 9512 | } |
39279cc3 | 9513 | |
ad19db71 CS |
9514 | /* |
9515 | * If the active LSM wants to access the inode during | |
9516 | * d_instantiate it needs these. Smack checks to see | |
9517 | * if the filesystem supports xattrs by looking at the | |
9518 | * ops vector. | |
9519 | */ | |
9520 | inode->i_fop = &btrfs_file_operations; | |
9521 | inode->i_op = &btrfs_file_inode_operations; | |
b0d5d10f | 9522 | inode->i_mapping->a_ops = &btrfs_aops; |
b0d5d10f CM |
9523 | BTRFS_I(inode)->io_tree.ops = &btrfs_extent_io_ops; |
9524 | ||
9525 | err = btrfs_init_inode_security(trans, inode, dir, &dentry->d_name); | |
9526 | if (err) | |
9527 | goto out_unlock_inode; | |
ad19db71 | 9528 | |
a1b075d2 | 9529 | err = btrfs_add_nondir(trans, dir, dentry, inode, 0, index); |
39279cc3 | 9530 | if (err) |
b0d5d10f | 9531 | goto out_unlock_inode; |
39279cc3 CM |
9532 | |
9533 | path = btrfs_alloc_path(); | |
d8926bb3 MF |
9534 | if (!path) { |
9535 | err = -ENOMEM; | |
b0d5d10f | 9536 | goto out_unlock_inode; |
d8926bb3 | 9537 | } |
33345d01 | 9538 | key.objectid = btrfs_ino(inode); |
39279cc3 | 9539 | key.offset = 0; |
962a298f | 9540 | key.type = BTRFS_EXTENT_DATA_KEY; |
39279cc3 CM |
9541 | datasize = btrfs_file_extent_calc_inline_size(name_len); |
9542 | err = btrfs_insert_empty_item(trans, root, path, &key, | |
9543 | datasize); | |
54aa1f4d | 9544 | if (err) { |
b0839166 | 9545 | btrfs_free_path(path); |
b0d5d10f | 9546 | goto out_unlock_inode; |
54aa1f4d | 9547 | } |
5f39d397 CM |
9548 | leaf = path->nodes[0]; |
9549 | ei = btrfs_item_ptr(leaf, path->slots[0], | |
9550 | struct btrfs_file_extent_item); | |
9551 | btrfs_set_file_extent_generation(leaf, ei, trans->transid); | |
9552 | btrfs_set_file_extent_type(leaf, ei, | |
39279cc3 | 9553 | BTRFS_FILE_EXTENT_INLINE); |
c8b97818 CM |
9554 | btrfs_set_file_extent_encryption(leaf, ei, 0); |
9555 | btrfs_set_file_extent_compression(leaf, ei, 0); | |
9556 | btrfs_set_file_extent_other_encoding(leaf, ei, 0); | |
9557 | btrfs_set_file_extent_ram_bytes(leaf, ei, name_len); | |
9558 | ||
39279cc3 | 9559 | ptr = btrfs_file_extent_inline_start(ei); |
5f39d397 CM |
9560 | write_extent_buffer(leaf, symname, ptr, name_len); |
9561 | btrfs_mark_buffer_dirty(leaf); | |
39279cc3 | 9562 | btrfs_free_path(path); |
5f39d397 | 9563 | |
39279cc3 CM |
9564 | inode->i_op = &btrfs_symlink_inode_operations; |
9565 | inode->i_mapping->a_ops = &btrfs_symlink_aops; | |
d899e052 | 9566 | inode_set_bytes(inode, name_len); |
f06becc4 | 9567 | btrfs_i_size_write(inode, name_len); |
54aa1f4d | 9568 | err = btrfs_update_inode(trans, root, inode); |
b0d5d10f | 9569 | if (err) { |
54aa1f4d | 9570 | drop_inode = 1; |
b0d5d10f CM |
9571 | goto out_unlock_inode; |
9572 | } | |
9573 | ||
9574 | unlock_new_inode(inode); | |
9575 | d_instantiate(dentry, inode); | |
39279cc3 CM |
9576 | |
9577 | out_unlock: | |
7ad85bb7 | 9578 | btrfs_end_transaction(trans, root); |
39279cc3 CM |
9579 | if (drop_inode) { |
9580 | inode_dec_link_count(inode); | |
9581 | iput(inode); | |
9582 | } | |
b53d3f5d | 9583 | btrfs_btree_balance_dirty(root); |
39279cc3 | 9584 | return err; |
b0d5d10f CM |
9585 | |
9586 | out_unlock_inode: | |
9587 | drop_inode = 1; | |
9588 | unlock_new_inode(inode); | |
9589 | goto out_unlock; | |
39279cc3 | 9590 | } |
16432985 | 9591 | |
0af3d00b JB |
9592 | static int __btrfs_prealloc_file_range(struct inode *inode, int mode, |
9593 | u64 start, u64 num_bytes, u64 min_size, | |
9594 | loff_t actual_len, u64 *alloc_hint, | |
9595 | struct btrfs_trans_handle *trans) | |
d899e052 | 9596 | { |
5dc562c5 JB |
9597 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; |
9598 | struct extent_map *em; | |
d899e052 YZ |
9599 | struct btrfs_root *root = BTRFS_I(inode)->root; |
9600 | struct btrfs_key ins; | |
d899e052 | 9601 | u64 cur_offset = start; |
55a61d1d | 9602 | u64 i_size; |
154ea289 | 9603 | u64 cur_bytes; |
d899e052 | 9604 | int ret = 0; |
0af3d00b | 9605 | bool own_trans = true; |
d899e052 | 9606 | |
0af3d00b JB |
9607 | if (trans) |
9608 | own_trans = false; | |
d899e052 | 9609 | while (num_bytes > 0) { |
0af3d00b JB |
9610 | if (own_trans) { |
9611 | trans = btrfs_start_transaction(root, 3); | |
9612 | if (IS_ERR(trans)) { | |
9613 | ret = PTR_ERR(trans); | |
9614 | break; | |
9615 | } | |
5a303d5d YZ |
9616 | } |
9617 | ||
154ea289 CM |
9618 | cur_bytes = min(num_bytes, 256ULL * 1024 * 1024); |
9619 | cur_bytes = max(cur_bytes, min_size); | |
00361589 | 9620 | ret = btrfs_reserve_extent(root, cur_bytes, min_size, 0, |
e570fd27 | 9621 | *alloc_hint, &ins, 1, 0); |
5a303d5d | 9622 | if (ret) { |
0af3d00b JB |
9623 | if (own_trans) |
9624 | btrfs_end_transaction(trans, root); | |
a22285a6 | 9625 | break; |
d899e052 | 9626 | } |
5a303d5d | 9627 | |
d899e052 YZ |
9628 | ret = insert_reserved_file_extent(trans, inode, |
9629 | cur_offset, ins.objectid, | |
9630 | ins.offset, ins.offset, | |
920bbbfb | 9631 | ins.offset, 0, 0, 0, |
d899e052 | 9632 | BTRFS_FILE_EXTENT_PREALLOC); |
79787eaa | 9633 | if (ret) { |
857cc2fc | 9634 | btrfs_free_reserved_extent(root, ins.objectid, |
e570fd27 | 9635 | ins.offset, 0); |
79787eaa JM |
9636 | btrfs_abort_transaction(trans, root, ret); |
9637 | if (own_trans) | |
9638 | btrfs_end_transaction(trans, root); | |
9639 | break; | |
9640 | } | |
31193213 | 9641 | |
a1ed835e CM |
9642 | btrfs_drop_extent_cache(inode, cur_offset, |
9643 | cur_offset + ins.offset -1, 0); | |
5a303d5d | 9644 | |
5dc562c5 JB |
9645 | em = alloc_extent_map(); |
9646 | if (!em) { | |
9647 | set_bit(BTRFS_INODE_NEEDS_FULL_SYNC, | |
9648 | &BTRFS_I(inode)->runtime_flags); | |
9649 | goto next; | |
9650 | } | |
9651 | ||
9652 | em->start = cur_offset; | |
9653 | em->orig_start = cur_offset; | |
9654 | em->len = ins.offset; | |
9655 | em->block_start = ins.objectid; | |
9656 | em->block_len = ins.offset; | |
b4939680 | 9657 | em->orig_block_len = ins.offset; |
cc95bef6 | 9658 | em->ram_bytes = ins.offset; |
5dc562c5 JB |
9659 | em->bdev = root->fs_info->fs_devices->latest_bdev; |
9660 | set_bit(EXTENT_FLAG_PREALLOC, &em->flags); | |
9661 | em->generation = trans->transid; | |
9662 | ||
9663 | while (1) { | |
9664 | write_lock(&em_tree->lock); | |
09a2a8f9 | 9665 | ret = add_extent_mapping(em_tree, em, 1); |
5dc562c5 JB |
9666 | write_unlock(&em_tree->lock); |
9667 | if (ret != -EEXIST) | |
9668 | break; | |
9669 | btrfs_drop_extent_cache(inode, cur_offset, | |
9670 | cur_offset + ins.offset - 1, | |
9671 | 0); | |
9672 | } | |
9673 | free_extent_map(em); | |
9674 | next: | |
d899e052 YZ |
9675 | num_bytes -= ins.offset; |
9676 | cur_offset += ins.offset; | |
efa56464 | 9677 | *alloc_hint = ins.objectid + ins.offset; |
5a303d5d | 9678 | |
0c4d2d95 | 9679 | inode_inc_iversion(inode); |
d899e052 | 9680 | inode->i_ctime = CURRENT_TIME; |
6cbff00f | 9681 | BTRFS_I(inode)->flags |= BTRFS_INODE_PREALLOC; |
d899e052 | 9682 | if (!(mode & FALLOC_FL_KEEP_SIZE) && |
efa56464 YZ |
9683 | (actual_len > inode->i_size) && |
9684 | (cur_offset > inode->i_size)) { | |
d1ea6a61 | 9685 | if (cur_offset > actual_len) |
55a61d1d | 9686 | i_size = actual_len; |
d1ea6a61 | 9687 | else |
55a61d1d JB |
9688 | i_size = cur_offset; |
9689 | i_size_write(inode, i_size); | |
9690 | btrfs_ordered_update_i_size(inode, i_size, NULL); | |
5a303d5d YZ |
9691 | } |
9692 | ||
d899e052 | 9693 | ret = btrfs_update_inode(trans, root, inode); |
79787eaa JM |
9694 | |
9695 | if (ret) { | |
9696 | btrfs_abort_transaction(trans, root, ret); | |
9697 | if (own_trans) | |
9698 | btrfs_end_transaction(trans, root); | |
9699 | break; | |
9700 | } | |
d899e052 | 9701 | |
0af3d00b JB |
9702 | if (own_trans) |
9703 | btrfs_end_transaction(trans, root); | |
5a303d5d | 9704 | } |
d899e052 YZ |
9705 | return ret; |
9706 | } | |
9707 | ||
0af3d00b JB |
9708 | int btrfs_prealloc_file_range(struct inode *inode, int mode, |
9709 | u64 start, u64 num_bytes, u64 min_size, | |
9710 | loff_t actual_len, u64 *alloc_hint) | |
9711 | { | |
9712 | return __btrfs_prealloc_file_range(inode, mode, start, num_bytes, | |
9713 | min_size, actual_len, alloc_hint, | |
9714 | NULL); | |
9715 | } | |
9716 | ||
9717 | int btrfs_prealloc_file_range_trans(struct inode *inode, | |
9718 | struct btrfs_trans_handle *trans, int mode, | |
9719 | u64 start, u64 num_bytes, u64 min_size, | |
9720 | loff_t actual_len, u64 *alloc_hint) | |
9721 | { | |
9722 | return __btrfs_prealloc_file_range(inode, mode, start, num_bytes, | |
9723 | min_size, actual_len, alloc_hint, trans); | |
9724 | } | |
9725 | ||
e6dcd2dc CM |
9726 | static int btrfs_set_page_dirty(struct page *page) |
9727 | { | |
e6dcd2dc CM |
9728 | return __set_page_dirty_nobuffers(page); |
9729 | } | |
9730 | ||
10556cb2 | 9731 | static int btrfs_permission(struct inode *inode, int mask) |
fdebe2bd | 9732 | { |
b83cc969 | 9733 | struct btrfs_root *root = BTRFS_I(inode)->root; |
cb6db4e5 | 9734 | umode_t mode = inode->i_mode; |
b83cc969 | 9735 | |
cb6db4e5 JM |
9736 | if (mask & MAY_WRITE && |
9737 | (S_ISREG(mode) || S_ISDIR(mode) || S_ISLNK(mode))) { | |
9738 | if (btrfs_root_readonly(root)) | |
9739 | return -EROFS; | |
9740 | if (BTRFS_I(inode)->flags & BTRFS_INODE_READONLY) | |
9741 | return -EACCES; | |
9742 | } | |
2830ba7f | 9743 | return generic_permission(inode, mask); |
fdebe2bd | 9744 | } |
39279cc3 | 9745 | |
ef3b9af5 FM |
9746 | static int btrfs_tmpfile(struct inode *dir, struct dentry *dentry, umode_t mode) |
9747 | { | |
9748 | struct btrfs_trans_handle *trans; | |
9749 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
9750 | struct inode *inode = NULL; | |
9751 | u64 objectid; | |
9752 | u64 index; | |
9753 | int ret = 0; | |
9754 | ||
9755 | /* | |
9756 | * 5 units required for adding orphan entry | |
9757 | */ | |
9758 | trans = btrfs_start_transaction(root, 5); | |
9759 | if (IS_ERR(trans)) | |
9760 | return PTR_ERR(trans); | |
9761 | ||
9762 | ret = btrfs_find_free_ino(root, &objectid); | |
9763 | if (ret) | |
9764 | goto out; | |
9765 | ||
9766 | inode = btrfs_new_inode(trans, root, dir, NULL, 0, | |
9767 | btrfs_ino(dir), objectid, mode, &index); | |
9768 | if (IS_ERR(inode)) { | |
9769 | ret = PTR_ERR(inode); | |
9770 | inode = NULL; | |
9771 | goto out; | |
9772 | } | |
9773 | ||
ef3b9af5 FM |
9774 | inode->i_fop = &btrfs_file_operations; |
9775 | inode->i_op = &btrfs_file_inode_operations; | |
9776 | ||
9777 | inode->i_mapping->a_ops = &btrfs_aops; | |
ef3b9af5 FM |
9778 | BTRFS_I(inode)->io_tree.ops = &btrfs_extent_io_ops; |
9779 | ||
b0d5d10f CM |
9780 | ret = btrfs_init_inode_security(trans, inode, dir, NULL); |
9781 | if (ret) | |
9782 | goto out_inode; | |
9783 | ||
9784 | ret = btrfs_update_inode(trans, root, inode); | |
9785 | if (ret) | |
9786 | goto out_inode; | |
ef3b9af5 FM |
9787 | ret = btrfs_orphan_add(trans, inode); |
9788 | if (ret) | |
b0d5d10f | 9789 | goto out_inode; |
ef3b9af5 | 9790 | |
5762b5c9 FM |
9791 | /* |
9792 | * We set number of links to 0 in btrfs_new_inode(), and here we set | |
9793 | * it to 1 because d_tmpfile() will issue a warning if the count is 0, | |
9794 | * through: | |
9795 | * | |
9796 | * d_tmpfile() -> inode_dec_link_count() -> drop_nlink() | |
9797 | */ | |
9798 | set_nlink(inode, 1); | |
b0d5d10f | 9799 | unlock_new_inode(inode); |
ef3b9af5 FM |
9800 | d_tmpfile(dentry, inode); |
9801 | mark_inode_dirty(inode); | |
9802 | ||
9803 | out: | |
9804 | btrfs_end_transaction(trans, root); | |
9805 | if (ret) | |
9806 | iput(inode); | |
9807 | btrfs_balance_delayed_items(root); | |
9808 | btrfs_btree_balance_dirty(root); | |
ef3b9af5 | 9809 | return ret; |
b0d5d10f CM |
9810 | |
9811 | out_inode: | |
9812 | unlock_new_inode(inode); | |
9813 | goto out; | |
9814 | ||
ef3b9af5 FM |
9815 | } |
9816 | ||
b38ef71c FM |
9817 | /* Inspired by filemap_check_errors() */ |
9818 | int btrfs_inode_check_errors(struct inode *inode) | |
9819 | { | |
9820 | int ret = 0; | |
9821 | ||
9822 | if (test_bit(AS_ENOSPC, &inode->i_mapping->flags) && | |
9823 | test_and_clear_bit(AS_ENOSPC, &inode->i_mapping->flags)) | |
9824 | ret = -ENOSPC; | |
9825 | if (test_bit(AS_EIO, &inode->i_mapping->flags) && | |
9826 | test_and_clear_bit(AS_EIO, &inode->i_mapping->flags)) | |
9827 | ret = -EIO; | |
9828 | ||
9829 | return ret; | |
9830 | } | |
9831 | ||
6e1d5dcc | 9832 | static const struct inode_operations btrfs_dir_inode_operations = { |
3394e160 | 9833 | .getattr = btrfs_getattr, |
39279cc3 CM |
9834 | .lookup = btrfs_lookup, |
9835 | .create = btrfs_create, | |
9836 | .unlink = btrfs_unlink, | |
9837 | .link = btrfs_link, | |
9838 | .mkdir = btrfs_mkdir, | |
9839 | .rmdir = btrfs_rmdir, | |
80ace85c | 9840 | .rename2 = btrfs_rename2, |
39279cc3 CM |
9841 | .symlink = btrfs_symlink, |
9842 | .setattr = btrfs_setattr, | |
618e21d5 | 9843 | .mknod = btrfs_mknod, |
95819c05 CH |
9844 | .setxattr = btrfs_setxattr, |
9845 | .getxattr = btrfs_getxattr, | |
5103e947 | 9846 | .listxattr = btrfs_listxattr, |
95819c05 | 9847 | .removexattr = btrfs_removexattr, |
fdebe2bd | 9848 | .permission = btrfs_permission, |
4e34e719 | 9849 | .get_acl = btrfs_get_acl, |
996a710d | 9850 | .set_acl = btrfs_set_acl, |
93fd63c2 | 9851 | .update_time = btrfs_update_time, |
ef3b9af5 | 9852 | .tmpfile = btrfs_tmpfile, |
39279cc3 | 9853 | }; |
6e1d5dcc | 9854 | static const struct inode_operations btrfs_dir_ro_inode_operations = { |
39279cc3 | 9855 | .lookup = btrfs_lookup, |
fdebe2bd | 9856 | .permission = btrfs_permission, |
4e34e719 | 9857 | .get_acl = btrfs_get_acl, |
996a710d | 9858 | .set_acl = btrfs_set_acl, |
93fd63c2 | 9859 | .update_time = btrfs_update_time, |
39279cc3 | 9860 | }; |
76dda93c | 9861 | |
828c0950 | 9862 | static const struct file_operations btrfs_dir_file_operations = { |
39279cc3 CM |
9863 | .llseek = generic_file_llseek, |
9864 | .read = generic_read_dir, | |
9cdda8d3 | 9865 | .iterate = btrfs_real_readdir, |
34287aa3 | 9866 | .unlocked_ioctl = btrfs_ioctl, |
39279cc3 | 9867 | #ifdef CONFIG_COMPAT |
34287aa3 | 9868 | .compat_ioctl = btrfs_ioctl, |
39279cc3 | 9869 | #endif |
6bf13c0c | 9870 | .release = btrfs_release_file, |
e02119d5 | 9871 | .fsync = btrfs_sync_file, |
39279cc3 CM |
9872 | }; |
9873 | ||
d1310b2e | 9874 | static struct extent_io_ops btrfs_extent_io_ops = { |
07157aac | 9875 | .fill_delalloc = run_delalloc_range, |
065631f6 | 9876 | .submit_bio_hook = btrfs_submit_bio_hook, |
239b14b3 | 9877 | .merge_bio_hook = btrfs_merge_bio_hook, |
07157aac | 9878 | .readpage_end_io_hook = btrfs_readpage_end_io_hook, |
e6dcd2dc | 9879 | .writepage_end_io_hook = btrfs_writepage_end_io_hook, |
247e743c | 9880 | .writepage_start_hook = btrfs_writepage_start_hook, |
b0c68f8b CM |
9881 | .set_bit_hook = btrfs_set_bit_hook, |
9882 | .clear_bit_hook = btrfs_clear_bit_hook, | |
9ed74f2d JB |
9883 | .merge_extent_hook = btrfs_merge_extent_hook, |
9884 | .split_extent_hook = btrfs_split_extent_hook, | |
07157aac CM |
9885 | }; |
9886 | ||
35054394 CM |
9887 | /* |
9888 | * btrfs doesn't support the bmap operation because swapfiles | |
9889 | * use bmap to make a mapping of extents in the file. They assume | |
9890 | * these extents won't change over the life of the file and they | |
9891 | * use the bmap result to do IO directly to the drive. | |
9892 | * | |
9893 | * the btrfs bmap call would return logical addresses that aren't | |
9894 | * suitable for IO and they also will change frequently as COW | |
9895 | * operations happen. So, swapfile + btrfs == corruption. | |
9896 | * | |
9897 | * For now we're avoiding this by dropping bmap. | |
9898 | */ | |
7f09410b | 9899 | static const struct address_space_operations btrfs_aops = { |
39279cc3 CM |
9900 | .readpage = btrfs_readpage, |
9901 | .writepage = btrfs_writepage, | |
b293f02e | 9902 | .writepages = btrfs_writepages, |
3ab2fb5a | 9903 | .readpages = btrfs_readpages, |
16432985 | 9904 | .direct_IO = btrfs_direct_IO, |
a52d9a80 CM |
9905 | .invalidatepage = btrfs_invalidatepage, |
9906 | .releasepage = btrfs_releasepage, | |
e6dcd2dc | 9907 | .set_page_dirty = btrfs_set_page_dirty, |
465fdd97 | 9908 | .error_remove_page = generic_error_remove_page, |
39279cc3 CM |
9909 | }; |
9910 | ||
7f09410b | 9911 | static const struct address_space_operations btrfs_symlink_aops = { |
39279cc3 CM |
9912 | .readpage = btrfs_readpage, |
9913 | .writepage = btrfs_writepage, | |
2bf5a725 CM |
9914 | .invalidatepage = btrfs_invalidatepage, |
9915 | .releasepage = btrfs_releasepage, | |
39279cc3 CM |
9916 | }; |
9917 | ||
6e1d5dcc | 9918 | static const struct inode_operations btrfs_file_inode_operations = { |
39279cc3 CM |
9919 | .getattr = btrfs_getattr, |
9920 | .setattr = btrfs_setattr, | |
95819c05 CH |
9921 | .setxattr = btrfs_setxattr, |
9922 | .getxattr = btrfs_getxattr, | |
5103e947 | 9923 | .listxattr = btrfs_listxattr, |
95819c05 | 9924 | .removexattr = btrfs_removexattr, |
fdebe2bd | 9925 | .permission = btrfs_permission, |
1506fcc8 | 9926 | .fiemap = btrfs_fiemap, |
4e34e719 | 9927 | .get_acl = btrfs_get_acl, |
996a710d | 9928 | .set_acl = btrfs_set_acl, |
e41f941a | 9929 | .update_time = btrfs_update_time, |
39279cc3 | 9930 | }; |
6e1d5dcc | 9931 | static const struct inode_operations btrfs_special_inode_operations = { |
618e21d5 JB |
9932 | .getattr = btrfs_getattr, |
9933 | .setattr = btrfs_setattr, | |
fdebe2bd | 9934 | .permission = btrfs_permission, |
95819c05 CH |
9935 | .setxattr = btrfs_setxattr, |
9936 | .getxattr = btrfs_getxattr, | |
33268eaf | 9937 | .listxattr = btrfs_listxattr, |
95819c05 | 9938 | .removexattr = btrfs_removexattr, |
4e34e719 | 9939 | .get_acl = btrfs_get_acl, |
996a710d | 9940 | .set_acl = btrfs_set_acl, |
e41f941a | 9941 | .update_time = btrfs_update_time, |
618e21d5 | 9942 | }; |
6e1d5dcc | 9943 | static const struct inode_operations btrfs_symlink_inode_operations = { |
39279cc3 CM |
9944 | .readlink = generic_readlink, |
9945 | .follow_link = page_follow_link_light, | |
9946 | .put_link = page_put_link, | |
f209561a | 9947 | .getattr = btrfs_getattr, |
22c44fe6 | 9948 | .setattr = btrfs_setattr, |
fdebe2bd | 9949 | .permission = btrfs_permission, |
0279b4cd JO |
9950 | .setxattr = btrfs_setxattr, |
9951 | .getxattr = btrfs_getxattr, | |
9952 | .listxattr = btrfs_listxattr, | |
9953 | .removexattr = btrfs_removexattr, | |
e41f941a | 9954 | .update_time = btrfs_update_time, |
39279cc3 | 9955 | }; |
76dda93c | 9956 | |
82d339d9 | 9957 | const struct dentry_operations btrfs_dentry_operations = { |
76dda93c | 9958 | .d_delete = btrfs_dentry_delete, |
b4aff1f8 | 9959 | .d_release = btrfs_dentry_release, |
76dda93c | 9960 | }; |