Commit | Line | Data |
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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 | ||
39279cc3 CM |
19 | #include <linux/fs.h> |
20 | #include <linux/pagemap.h> | |
21 | #include <linux/highmem.h> | |
22 | #include <linux/time.h> | |
23 | #include <linux/init.h> | |
24 | #include <linux/string.h> | |
39279cc3 CM |
25 | #include <linux/backing-dev.h> |
26 | #include <linux/mpage.h> | |
a27bb332 | 27 | #include <linux/aio.h> |
2fe17c10 | 28 | #include <linux/falloc.h> |
39279cc3 CM |
29 | #include <linux/swap.h> |
30 | #include <linux/writeback.h> | |
31 | #include <linux/statfs.h> | |
32 | #include <linux/compat.h> | |
5a0e3ad6 | 33 | #include <linux/slab.h> |
55e301fd | 34 | #include <linux/btrfs.h> |
39279cc3 CM |
35 | #include "ctree.h" |
36 | #include "disk-io.h" | |
37 | #include "transaction.h" | |
38 | #include "btrfs_inode.h" | |
39279cc3 | 39 | #include "print-tree.h" |
e02119d5 CM |
40 | #include "tree-log.h" |
41 | #include "locking.h" | |
2aaa6655 | 42 | #include "volumes.h" |
39279cc3 | 43 | |
9247f317 | 44 | static struct kmem_cache *btrfs_inode_defrag_cachep; |
4cb5300b CM |
45 | /* |
46 | * when auto defrag is enabled we | |
47 | * queue up these defrag structs to remember which | |
48 | * inodes need defragging passes | |
49 | */ | |
50 | struct inode_defrag { | |
51 | struct rb_node rb_node; | |
52 | /* objectid */ | |
53 | u64 ino; | |
54 | /* | |
55 | * transid where the defrag was added, we search for | |
56 | * extents newer than this | |
57 | */ | |
58 | u64 transid; | |
59 | ||
60 | /* root objectid */ | |
61 | u64 root; | |
62 | ||
63 | /* last offset we were able to defrag */ | |
64 | u64 last_offset; | |
65 | ||
66 | /* if we've wrapped around back to zero once already */ | |
67 | int cycled; | |
68 | }; | |
69 | ||
762f2263 MX |
70 | static int __compare_inode_defrag(struct inode_defrag *defrag1, |
71 | struct inode_defrag *defrag2) | |
72 | { | |
73 | if (defrag1->root > defrag2->root) | |
74 | return 1; | |
75 | else if (defrag1->root < defrag2->root) | |
76 | return -1; | |
77 | else if (defrag1->ino > defrag2->ino) | |
78 | return 1; | |
79 | else if (defrag1->ino < defrag2->ino) | |
80 | return -1; | |
81 | else | |
82 | return 0; | |
83 | } | |
84 | ||
4cb5300b CM |
85 | /* pop a record for an inode into the defrag tree. The lock |
86 | * must be held already | |
87 | * | |
88 | * If you're inserting a record for an older transid than an | |
89 | * existing record, the transid already in the tree is lowered | |
90 | * | |
91 | * If an existing record is found the defrag item you | |
92 | * pass in is freed | |
93 | */ | |
8ddc4734 | 94 | static int __btrfs_add_inode_defrag(struct inode *inode, |
4cb5300b CM |
95 | struct inode_defrag *defrag) |
96 | { | |
97 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
98 | struct inode_defrag *entry; | |
99 | struct rb_node **p; | |
100 | struct rb_node *parent = NULL; | |
762f2263 | 101 | int ret; |
4cb5300b CM |
102 | |
103 | p = &root->fs_info->defrag_inodes.rb_node; | |
104 | while (*p) { | |
105 | parent = *p; | |
106 | entry = rb_entry(parent, struct inode_defrag, rb_node); | |
107 | ||
762f2263 MX |
108 | ret = __compare_inode_defrag(defrag, entry); |
109 | if (ret < 0) | |
4cb5300b | 110 | p = &parent->rb_left; |
762f2263 | 111 | else if (ret > 0) |
4cb5300b CM |
112 | p = &parent->rb_right; |
113 | else { | |
114 | /* if we're reinserting an entry for | |
115 | * an old defrag run, make sure to | |
116 | * lower the transid of our existing record | |
117 | */ | |
118 | if (defrag->transid < entry->transid) | |
119 | entry->transid = defrag->transid; | |
120 | if (defrag->last_offset > entry->last_offset) | |
121 | entry->last_offset = defrag->last_offset; | |
8ddc4734 | 122 | return -EEXIST; |
4cb5300b CM |
123 | } |
124 | } | |
72ac3c0d | 125 | set_bit(BTRFS_INODE_IN_DEFRAG, &BTRFS_I(inode)->runtime_flags); |
4cb5300b CM |
126 | rb_link_node(&defrag->rb_node, parent, p); |
127 | rb_insert_color(&defrag->rb_node, &root->fs_info->defrag_inodes); | |
8ddc4734 MX |
128 | return 0; |
129 | } | |
4cb5300b | 130 | |
8ddc4734 MX |
131 | static inline int __need_auto_defrag(struct btrfs_root *root) |
132 | { | |
133 | if (!btrfs_test_opt(root, AUTO_DEFRAG)) | |
134 | return 0; | |
135 | ||
136 | if (btrfs_fs_closing(root->fs_info)) | |
137 | return 0; | |
4cb5300b | 138 | |
8ddc4734 | 139 | return 1; |
4cb5300b CM |
140 | } |
141 | ||
142 | /* | |
143 | * insert a defrag record for this inode if auto defrag is | |
144 | * enabled | |
145 | */ | |
146 | int btrfs_add_inode_defrag(struct btrfs_trans_handle *trans, | |
147 | struct inode *inode) | |
148 | { | |
149 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
150 | struct inode_defrag *defrag; | |
4cb5300b | 151 | u64 transid; |
8ddc4734 | 152 | int ret; |
4cb5300b | 153 | |
8ddc4734 | 154 | if (!__need_auto_defrag(root)) |
4cb5300b CM |
155 | return 0; |
156 | ||
72ac3c0d | 157 | if (test_bit(BTRFS_INODE_IN_DEFRAG, &BTRFS_I(inode)->runtime_flags)) |
4cb5300b CM |
158 | return 0; |
159 | ||
160 | if (trans) | |
161 | transid = trans->transid; | |
162 | else | |
163 | transid = BTRFS_I(inode)->root->last_trans; | |
164 | ||
9247f317 | 165 | defrag = kmem_cache_zalloc(btrfs_inode_defrag_cachep, GFP_NOFS); |
4cb5300b CM |
166 | if (!defrag) |
167 | return -ENOMEM; | |
168 | ||
a4689d2b | 169 | defrag->ino = btrfs_ino(inode); |
4cb5300b CM |
170 | defrag->transid = transid; |
171 | defrag->root = root->root_key.objectid; | |
172 | ||
173 | spin_lock(&root->fs_info->defrag_inodes_lock); | |
8ddc4734 MX |
174 | if (!test_bit(BTRFS_INODE_IN_DEFRAG, &BTRFS_I(inode)->runtime_flags)) { |
175 | /* | |
176 | * If we set IN_DEFRAG flag and evict the inode from memory, | |
177 | * and then re-read this inode, this new inode doesn't have | |
178 | * IN_DEFRAG flag. At the case, we may find the existed defrag. | |
179 | */ | |
180 | ret = __btrfs_add_inode_defrag(inode, defrag); | |
181 | if (ret) | |
182 | kmem_cache_free(btrfs_inode_defrag_cachep, defrag); | |
183 | } else { | |
9247f317 | 184 | kmem_cache_free(btrfs_inode_defrag_cachep, defrag); |
8ddc4734 | 185 | } |
4cb5300b | 186 | spin_unlock(&root->fs_info->defrag_inodes_lock); |
a0f98dde | 187 | return 0; |
4cb5300b CM |
188 | } |
189 | ||
190 | /* | |
8ddc4734 MX |
191 | * Requeue the defrag object. If there is a defrag object that points to |
192 | * the same inode in the tree, we will merge them together (by | |
193 | * __btrfs_add_inode_defrag()) and free the one that we want to requeue. | |
4cb5300b | 194 | */ |
48a3b636 ES |
195 | static void btrfs_requeue_inode_defrag(struct inode *inode, |
196 | struct inode_defrag *defrag) | |
8ddc4734 MX |
197 | { |
198 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
199 | int ret; | |
200 | ||
201 | if (!__need_auto_defrag(root)) | |
202 | goto out; | |
203 | ||
204 | /* | |
205 | * Here we don't check the IN_DEFRAG flag, because we need merge | |
206 | * them together. | |
207 | */ | |
208 | spin_lock(&root->fs_info->defrag_inodes_lock); | |
209 | ret = __btrfs_add_inode_defrag(inode, defrag); | |
210 | spin_unlock(&root->fs_info->defrag_inodes_lock); | |
211 | if (ret) | |
212 | goto out; | |
213 | return; | |
214 | out: | |
215 | kmem_cache_free(btrfs_inode_defrag_cachep, defrag); | |
216 | } | |
217 | ||
4cb5300b | 218 | /* |
26176e7c MX |
219 | * pick the defragable inode that we want, if it doesn't exist, we will get |
220 | * the next one. | |
4cb5300b | 221 | */ |
26176e7c MX |
222 | static struct inode_defrag * |
223 | btrfs_pick_defrag_inode(struct btrfs_fs_info *fs_info, u64 root, u64 ino) | |
4cb5300b CM |
224 | { |
225 | struct inode_defrag *entry = NULL; | |
762f2263 | 226 | struct inode_defrag tmp; |
4cb5300b CM |
227 | struct rb_node *p; |
228 | struct rb_node *parent = NULL; | |
762f2263 MX |
229 | int ret; |
230 | ||
231 | tmp.ino = ino; | |
232 | tmp.root = root; | |
4cb5300b | 233 | |
26176e7c MX |
234 | spin_lock(&fs_info->defrag_inodes_lock); |
235 | p = fs_info->defrag_inodes.rb_node; | |
4cb5300b CM |
236 | while (p) { |
237 | parent = p; | |
238 | entry = rb_entry(parent, struct inode_defrag, rb_node); | |
239 | ||
762f2263 MX |
240 | ret = __compare_inode_defrag(&tmp, entry); |
241 | if (ret < 0) | |
4cb5300b | 242 | p = parent->rb_left; |
762f2263 | 243 | else if (ret > 0) |
4cb5300b CM |
244 | p = parent->rb_right; |
245 | else | |
26176e7c | 246 | goto out; |
4cb5300b CM |
247 | } |
248 | ||
26176e7c MX |
249 | if (parent && __compare_inode_defrag(&tmp, entry) > 0) { |
250 | parent = rb_next(parent); | |
251 | if (parent) | |
4cb5300b | 252 | entry = rb_entry(parent, struct inode_defrag, rb_node); |
26176e7c MX |
253 | else |
254 | entry = NULL; | |
4cb5300b | 255 | } |
26176e7c MX |
256 | out: |
257 | if (entry) | |
258 | rb_erase(parent, &fs_info->defrag_inodes); | |
259 | spin_unlock(&fs_info->defrag_inodes_lock); | |
260 | return entry; | |
4cb5300b CM |
261 | } |
262 | ||
26176e7c | 263 | void btrfs_cleanup_defrag_inodes(struct btrfs_fs_info *fs_info) |
4cb5300b CM |
264 | { |
265 | struct inode_defrag *defrag; | |
26176e7c MX |
266 | struct rb_node *node; |
267 | ||
268 | spin_lock(&fs_info->defrag_inodes_lock); | |
269 | node = rb_first(&fs_info->defrag_inodes); | |
270 | while (node) { | |
271 | rb_erase(node, &fs_info->defrag_inodes); | |
272 | defrag = rb_entry(node, struct inode_defrag, rb_node); | |
273 | kmem_cache_free(btrfs_inode_defrag_cachep, defrag); | |
274 | ||
275 | if (need_resched()) { | |
276 | spin_unlock(&fs_info->defrag_inodes_lock); | |
277 | cond_resched(); | |
278 | spin_lock(&fs_info->defrag_inodes_lock); | |
279 | } | |
280 | ||
281 | node = rb_first(&fs_info->defrag_inodes); | |
282 | } | |
283 | spin_unlock(&fs_info->defrag_inodes_lock); | |
284 | } | |
285 | ||
286 | #define BTRFS_DEFRAG_BATCH 1024 | |
287 | ||
288 | static int __btrfs_run_defrag_inode(struct btrfs_fs_info *fs_info, | |
289 | struct inode_defrag *defrag) | |
290 | { | |
4cb5300b CM |
291 | struct btrfs_root *inode_root; |
292 | struct inode *inode; | |
4cb5300b CM |
293 | struct btrfs_key key; |
294 | struct btrfs_ioctl_defrag_range_args range; | |
4cb5300b | 295 | int num_defrag; |
6f1c3605 LB |
296 | int index; |
297 | int ret; | |
4cb5300b | 298 | |
26176e7c MX |
299 | /* get the inode */ |
300 | key.objectid = defrag->root; | |
301 | btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY); | |
302 | key.offset = (u64)-1; | |
6f1c3605 LB |
303 | |
304 | index = srcu_read_lock(&fs_info->subvol_srcu); | |
305 | ||
26176e7c MX |
306 | inode_root = btrfs_read_fs_root_no_name(fs_info, &key); |
307 | if (IS_ERR(inode_root)) { | |
6f1c3605 LB |
308 | ret = PTR_ERR(inode_root); |
309 | goto cleanup; | |
310 | } | |
26176e7c MX |
311 | |
312 | key.objectid = defrag->ino; | |
313 | btrfs_set_key_type(&key, BTRFS_INODE_ITEM_KEY); | |
314 | key.offset = 0; | |
315 | inode = btrfs_iget(fs_info->sb, &key, inode_root, NULL); | |
316 | if (IS_ERR(inode)) { | |
6f1c3605 LB |
317 | ret = PTR_ERR(inode); |
318 | goto cleanup; | |
26176e7c | 319 | } |
6f1c3605 | 320 | srcu_read_unlock(&fs_info->subvol_srcu, index); |
26176e7c MX |
321 | |
322 | /* do a chunk of defrag */ | |
323 | clear_bit(BTRFS_INODE_IN_DEFRAG, &BTRFS_I(inode)->runtime_flags); | |
4cb5300b CM |
324 | memset(&range, 0, sizeof(range)); |
325 | range.len = (u64)-1; | |
26176e7c | 326 | range.start = defrag->last_offset; |
b66f00da MX |
327 | |
328 | sb_start_write(fs_info->sb); | |
26176e7c MX |
329 | num_defrag = btrfs_defrag_file(inode, NULL, &range, defrag->transid, |
330 | BTRFS_DEFRAG_BATCH); | |
b66f00da | 331 | sb_end_write(fs_info->sb); |
26176e7c MX |
332 | /* |
333 | * if we filled the whole defrag batch, there | |
334 | * must be more work to do. Queue this defrag | |
335 | * again | |
336 | */ | |
337 | if (num_defrag == BTRFS_DEFRAG_BATCH) { | |
338 | defrag->last_offset = range.start; | |
339 | btrfs_requeue_inode_defrag(inode, defrag); | |
340 | } else if (defrag->last_offset && !defrag->cycled) { | |
341 | /* | |
342 | * we didn't fill our defrag batch, but | |
343 | * we didn't start at zero. Make sure we loop | |
344 | * around to the start of the file. | |
345 | */ | |
346 | defrag->last_offset = 0; | |
347 | defrag->cycled = 1; | |
348 | btrfs_requeue_inode_defrag(inode, defrag); | |
349 | } else { | |
350 | kmem_cache_free(btrfs_inode_defrag_cachep, defrag); | |
351 | } | |
352 | ||
353 | iput(inode); | |
354 | return 0; | |
6f1c3605 LB |
355 | cleanup: |
356 | srcu_read_unlock(&fs_info->subvol_srcu, index); | |
357 | kmem_cache_free(btrfs_inode_defrag_cachep, defrag); | |
358 | return ret; | |
26176e7c MX |
359 | } |
360 | ||
361 | /* | |
362 | * run through the list of inodes in the FS that need | |
363 | * defragging | |
364 | */ | |
365 | int btrfs_run_defrag_inodes(struct btrfs_fs_info *fs_info) | |
366 | { | |
367 | struct inode_defrag *defrag; | |
368 | u64 first_ino = 0; | |
369 | u64 root_objectid = 0; | |
4cb5300b CM |
370 | |
371 | atomic_inc(&fs_info->defrag_running); | |
67871254 | 372 | while (1) { |
dc81cdc5 MX |
373 | /* Pause the auto defragger. */ |
374 | if (test_bit(BTRFS_FS_STATE_REMOUNTING, | |
375 | &fs_info->fs_state)) | |
376 | break; | |
377 | ||
26176e7c MX |
378 | if (!__need_auto_defrag(fs_info->tree_root)) |
379 | break; | |
4cb5300b CM |
380 | |
381 | /* find an inode to defrag */ | |
26176e7c MX |
382 | defrag = btrfs_pick_defrag_inode(fs_info, root_objectid, |
383 | first_ino); | |
4cb5300b | 384 | if (!defrag) { |
26176e7c | 385 | if (root_objectid || first_ino) { |
762f2263 | 386 | root_objectid = 0; |
4cb5300b CM |
387 | first_ino = 0; |
388 | continue; | |
389 | } else { | |
390 | break; | |
391 | } | |
392 | } | |
393 | ||
4cb5300b | 394 | first_ino = defrag->ino + 1; |
762f2263 | 395 | root_objectid = defrag->root; |
4cb5300b | 396 | |
26176e7c | 397 | __btrfs_run_defrag_inode(fs_info, defrag); |
4cb5300b | 398 | } |
4cb5300b CM |
399 | atomic_dec(&fs_info->defrag_running); |
400 | ||
401 | /* | |
402 | * during unmount, we use the transaction_wait queue to | |
403 | * wait for the defragger to stop | |
404 | */ | |
405 | wake_up(&fs_info->transaction_wait); | |
406 | return 0; | |
407 | } | |
39279cc3 | 408 | |
d352ac68 CM |
409 | /* simple helper to fault in pages and copy. This should go away |
410 | * and be replaced with calls into generic code. | |
411 | */ | |
d397712b | 412 | static noinline int btrfs_copy_from_user(loff_t pos, int num_pages, |
d0215f3e | 413 | size_t write_bytes, |
a1b32a59 | 414 | struct page **prepared_pages, |
11c65dcc | 415 | struct iov_iter *i) |
39279cc3 | 416 | { |
914ee295 | 417 | size_t copied = 0; |
d0215f3e | 418 | size_t total_copied = 0; |
11c65dcc | 419 | int pg = 0; |
39279cc3 CM |
420 | int offset = pos & (PAGE_CACHE_SIZE - 1); |
421 | ||
11c65dcc | 422 | while (write_bytes > 0) { |
39279cc3 CM |
423 | size_t count = min_t(size_t, |
424 | PAGE_CACHE_SIZE - offset, write_bytes); | |
11c65dcc | 425 | struct page *page = prepared_pages[pg]; |
914ee295 XZ |
426 | /* |
427 | * Copy data from userspace to the current page | |
428 | * | |
429 | * Disable pagefault to avoid recursive lock since | |
430 | * the pages are already locked | |
431 | */ | |
432 | pagefault_disable(); | |
433 | copied = iov_iter_copy_from_user_atomic(page, i, offset, count); | |
434 | pagefault_enable(); | |
11c65dcc | 435 | |
39279cc3 CM |
436 | /* Flush processor's dcache for this page */ |
437 | flush_dcache_page(page); | |
31339acd CM |
438 | |
439 | /* | |
440 | * if we get a partial write, we can end up with | |
441 | * partially up to date pages. These add | |
442 | * a lot of complexity, so make sure they don't | |
443 | * happen by forcing this copy to be retried. | |
444 | * | |
445 | * The rest of the btrfs_file_write code will fall | |
446 | * back to page at a time copies after we return 0. | |
447 | */ | |
448 | if (!PageUptodate(page) && copied < count) | |
449 | copied = 0; | |
450 | ||
11c65dcc JB |
451 | iov_iter_advance(i, copied); |
452 | write_bytes -= copied; | |
914ee295 | 453 | total_copied += copied; |
39279cc3 | 454 | |
914ee295 | 455 | /* Return to btrfs_file_aio_write to fault page */ |
9f570b8d | 456 | if (unlikely(copied == 0)) |
914ee295 | 457 | break; |
11c65dcc JB |
458 | |
459 | if (unlikely(copied < PAGE_CACHE_SIZE - offset)) { | |
460 | offset += copied; | |
461 | } else { | |
462 | pg++; | |
463 | offset = 0; | |
464 | } | |
39279cc3 | 465 | } |
914ee295 | 466 | return total_copied; |
39279cc3 CM |
467 | } |
468 | ||
d352ac68 CM |
469 | /* |
470 | * unlocks pages after btrfs_file_write is done with them | |
471 | */ | |
48a3b636 | 472 | static void btrfs_drop_pages(struct page **pages, size_t num_pages) |
39279cc3 CM |
473 | { |
474 | size_t i; | |
475 | for (i = 0; i < num_pages; i++) { | |
d352ac68 CM |
476 | /* page checked is some magic around finding pages that |
477 | * have been modified without going through btrfs_set_page_dirty | |
478 | * clear it here | |
479 | */ | |
4a096752 | 480 | ClearPageChecked(pages[i]); |
39279cc3 CM |
481 | unlock_page(pages[i]); |
482 | mark_page_accessed(pages[i]); | |
483 | page_cache_release(pages[i]); | |
484 | } | |
485 | } | |
486 | ||
d352ac68 CM |
487 | /* |
488 | * after copy_from_user, pages need to be dirtied and we need to make | |
489 | * sure holes are created between the current EOF and the start of | |
490 | * any next extents (if required). | |
491 | * | |
492 | * this also makes the decision about creating an inline extent vs | |
493 | * doing real data extents, marking pages dirty and delalloc as required. | |
494 | */ | |
be1a12a0 | 495 | int btrfs_dirty_pages(struct btrfs_root *root, struct inode *inode, |
48a3b636 ES |
496 | struct page **pages, size_t num_pages, |
497 | loff_t pos, size_t write_bytes, | |
498 | struct extent_state **cached) | |
39279cc3 | 499 | { |
39279cc3 | 500 | int err = 0; |
a52d9a80 | 501 | int i; |
db94535d | 502 | u64 num_bytes; |
a52d9a80 CM |
503 | u64 start_pos; |
504 | u64 end_of_last_block; | |
505 | u64 end_pos = pos + write_bytes; | |
506 | loff_t isize = i_size_read(inode); | |
39279cc3 | 507 | |
5f39d397 | 508 | start_pos = pos & ~((u64)root->sectorsize - 1); |
fda2832f | 509 | num_bytes = ALIGN(write_bytes + pos - start_pos, root->sectorsize); |
39279cc3 | 510 | |
db94535d | 511 | end_of_last_block = start_pos + num_bytes - 1; |
2ac55d41 | 512 | err = btrfs_set_extent_delalloc(inode, start_pos, end_of_last_block, |
be1a12a0 | 513 | cached); |
d0215f3e JB |
514 | if (err) |
515 | return err; | |
9ed74f2d | 516 | |
c8b97818 CM |
517 | for (i = 0; i < num_pages; i++) { |
518 | struct page *p = pages[i]; | |
519 | SetPageUptodate(p); | |
520 | ClearPageChecked(p); | |
521 | set_page_dirty(p); | |
a52d9a80 | 522 | } |
9f570b8d JB |
523 | |
524 | /* | |
525 | * we've only changed i_size in ram, and we haven't updated | |
526 | * the disk i_size. There is no need to log the inode | |
527 | * at this time. | |
528 | */ | |
529 | if (end_pos > isize) | |
a52d9a80 | 530 | i_size_write(inode, end_pos); |
a22285a6 | 531 | return 0; |
39279cc3 CM |
532 | } |
533 | ||
d352ac68 CM |
534 | /* |
535 | * this drops all the extents in the cache that intersect the range | |
536 | * [start, end]. Existing extents are split as required. | |
537 | */ | |
7014cdb4 JB |
538 | void btrfs_drop_extent_cache(struct inode *inode, u64 start, u64 end, |
539 | int skip_pinned) | |
a52d9a80 CM |
540 | { |
541 | struct extent_map *em; | |
3b951516 CM |
542 | struct extent_map *split = NULL; |
543 | struct extent_map *split2 = NULL; | |
a52d9a80 | 544 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; |
39b5637f | 545 | u64 len = end - start + 1; |
5dc562c5 | 546 | u64 gen; |
3b951516 CM |
547 | int ret; |
548 | int testend = 1; | |
5b21f2ed | 549 | unsigned long flags; |
c8b97818 | 550 | int compressed = 0; |
09a2a8f9 | 551 | bool modified; |
a52d9a80 | 552 | |
e6dcd2dc | 553 | WARN_ON(end < start); |
3b951516 | 554 | if (end == (u64)-1) { |
39b5637f | 555 | len = (u64)-1; |
3b951516 CM |
556 | testend = 0; |
557 | } | |
d397712b | 558 | while (1) { |
7014cdb4 JB |
559 | int no_splits = 0; |
560 | ||
09a2a8f9 | 561 | modified = false; |
3b951516 | 562 | if (!split) |
172ddd60 | 563 | split = alloc_extent_map(); |
3b951516 | 564 | if (!split2) |
172ddd60 | 565 | split2 = alloc_extent_map(); |
7014cdb4 JB |
566 | if (!split || !split2) |
567 | no_splits = 1; | |
3b951516 | 568 | |
890871be | 569 | write_lock(&em_tree->lock); |
39b5637f | 570 | em = lookup_extent_mapping(em_tree, start, len); |
d1310b2e | 571 | if (!em) { |
890871be | 572 | write_unlock(&em_tree->lock); |
a52d9a80 | 573 | break; |
d1310b2e | 574 | } |
5b21f2ed | 575 | flags = em->flags; |
5dc562c5 | 576 | gen = em->generation; |
5b21f2ed | 577 | if (skip_pinned && test_bit(EXTENT_FLAG_PINNED, &em->flags)) { |
55ef6899 | 578 | if (testend && em->start + em->len >= start + len) { |
5b21f2ed | 579 | free_extent_map(em); |
a1ed835e | 580 | write_unlock(&em_tree->lock); |
5b21f2ed ZY |
581 | break; |
582 | } | |
55ef6899 YZ |
583 | start = em->start + em->len; |
584 | if (testend) | |
5b21f2ed | 585 | len = start + len - (em->start + em->len); |
5b21f2ed | 586 | free_extent_map(em); |
a1ed835e | 587 | write_unlock(&em_tree->lock); |
5b21f2ed ZY |
588 | continue; |
589 | } | |
c8b97818 | 590 | compressed = test_bit(EXTENT_FLAG_COMPRESSED, &em->flags); |
3ce7e67a | 591 | clear_bit(EXTENT_FLAG_PINNED, &em->flags); |
3b277594 | 592 | clear_bit(EXTENT_FLAG_LOGGING, &flags); |
09a2a8f9 | 593 | modified = !list_empty(&em->list); |
a52d9a80 | 594 | remove_extent_mapping(em_tree, em); |
7014cdb4 JB |
595 | if (no_splits) |
596 | goto next; | |
3b951516 | 597 | |
ee20a983 | 598 | if (em->start < start) { |
3b951516 CM |
599 | split->start = em->start; |
600 | split->len = start - em->start; | |
ee20a983 JB |
601 | |
602 | if (em->block_start < EXTENT_MAP_LAST_BYTE) { | |
603 | split->orig_start = em->orig_start; | |
604 | split->block_start = em->block_start; | |
605 | ||
606 | if (compressed) | |
607 | split->block_len = em->block_len; | |
608 | else | |
609 | split->block_len = split->len; | |
610 | split->orig_block_len = max(split->block_len, | |
611 | em->orig_block_len); | |
612 | split->ram_bytes = em->ram_bytes; | |
613 | } else { | |
614 | split->orig_start = split->start; | |
615 | split->block_len = 0; | |
616 | split->block_start = em->block_start; | |
617 | split->orig_block_len = 0; | |
618 | split->ram_bytes = split->len; | |
619 | } | |
620 | ||
5dc562c5 | 621 | split->generation = gen; |
3b951516 | 622 | split->bdev = em->bdev; |
5b21f2ed | 623 | split->flags = flags; |
261507a0 | 624 | split->compress_type = em->compress_type; |
09a2a8f9 | 625 | ret = add_extent_mapping(em_tree, split, modified); |
79787eaa | 626 | BUG_ON(ret); /* Logic error */ |
3b951516 CM |
627 | free_extent_map(split); |
628 | split = split2; | |
629 | split2 = NULL; | |
630 | } | |
ee20a983 | 631 | if (testend && em->start + em->len > start + len) { |
3b951516 CM |
632 | u64 diff = start + len - em->start; |
633 | ||
634 | split->start = start + len; | |
635 | split->len = em->start + em->len - (start + len); | |
636 | split->bdev = em->bdev; | |
5b21f2ed | 637 | split->flags = flags; |
261507a0 | 638 | split->compress_type = em->compress_type; |
5dc562c5 | 639 | split->generation = gen; |
ee20a983 JB |
640 | |
641 | if (em->block_start < EXTENT_MAP_LAST_BYTE) { | |
642 | split->orig_block_len = max(em->block_len, | |
b4939680 | 643 | em->orig_block_len); |
3b951516 | 644 | |
ee20a983 JB |
645 | split->ram_bytes = em->ram_bytes; |
646 | if (compressed) { | |
647 | split->block_len = em->block_len; | |
648 | split->block_start = em->block_start; | |
649 | split->orig_start = em->orig_start; | |
650 | } else { | |
651 | split->block_len = split->len; | |
652 | split->block_start = em->block_start | |
653 | + diff; | |
654 | split->orig_start = em->orig_start; | |
655 | } | |
c8b97818 | 656 | } else { |
ee20a983 JB |
657 | split->ram_bytes = split->len; |
658 | split->orig_start = split->start; | |
659 | split->block_len = 0; | |
660 | split->block_start = em->block_start; | |
661 | split->orig_block_len = 0; | |
c8b97818 | 662 | } |
3b951516 | 663 | |
09a2a8f9 | 664 | ret = add_extent_mapping(em_tree, split, modified); |
79787eaa | 665 | BUG_ON(ret); /* Logic error */ |
3b951516 CM |
666 | free_extent_map(split); |
667 | split = NULL; | |
668 | } | |
7014cdb4 | 669 | next: |
890871be | 670 | write_unlock(&em_tree->lock); |
d1310b2e | 671 | |
a52d9a80 CM |
672 | /* once for us */ |
673 | free_extent_map(em); | |
674 | /* once for the tree*/ | |
675 | free_extent_map(em); | |
676 | } | |
3b951516 CM |
677 | if (split) |
678 | free_extent_map(split); | |
679 | if (split2) | |
680 | free_extent_map(split2); | |
a52d9a80 CM |
681 | } |
682 | ||
39279cc3 CM |
683 | /* |
684 | * this is very complex, but the basic idea is to drop all extents | |
685 | * in the range start - end. hint_block is filled in with a block number | |
686 | * that would be a good hint to the block allocator for this file. | |
687 | * | |
688 | * If an extent intersects the range but is not entirely inside the range | |
689 | * it is either truncated or split. Anything entirely inside the range | |
690 | * is deleted from the tree. | |
691 | */ | |
5dc562c5 JB |
692 | int __btrfs_drop_extents(struct btrfs_trans_handle *trans, |
693 | struct btrfs_root *root, struct inode *inode, | |
694 | struct btrfs_path *path, u64 start, u64 end, | |
2aaa6655 | 695 | u64 *drop_end, int drop_cache) |
39279cc3 | 696 | { |
5f39d397 | 697 | struct extent_buffer *leaf; |
920bbbfb | 698 | struct btrfs_file_extent_item *fi; |
00f5c795 | 699 | struct btrfs_key key; |
920bbbfb | 700 | struct btrfs_key new_key; |
33345d01 | 701 | u64 ino = btrfs_ino(inode); |
920bbbfb YZ |
702 | u64 search_start = start; |
703 | u64 disk_bytenr = 0; | |
704 | u64 num_bytes = 0; | |
705 | u64 extent_offset = 0; | |
706 | u64 extent_end = 0; | |
707 | int del_nr = 0; | |
708 | int del_slot = 0; | |
709 | int extent_type; | |
ccd467d6 | 710 | int recow; |
00f5c795 | 711 | int ret; |
dc7fdde3 | 712 | int modify_tree = -1; |
5dc562c5 | 713 | int update_refs = (root->ref_cows || root == root->fs_info->tree_root); |
c3308f84 | 714 | int found = 0; |
39279cc3 | 715 | |
a1ed835e CM |
716 | if (drop_cache) |
717 | btrfs_drop_extent_cache(inode, start, end - 1, 0); | |
a52d9a80 | 718 | |
dc7fdde3 CM |
719 | if (start >= BTRFS_I(inode)->disk_i_size) |
720 | modify_tree = 0; | |
721 | ||
d397712b | 722 | while (1) { |
ccd467d6 | 723 | recow = 0; |
33345d01 | 724 | ret = btrfs_lookup_file_extent(trans, root, path, ino, |
dc7fdde3 | 725 | search_start, modify_tree); |
39279cc3 | 726 | if (ret < 0) |
920bbbfb YZ |
727 | break; |
728 | if (ret > 0 && path->slots[0] > 0 && search_start == start) { | |
729 | leaf = path->nodes[0]; | |
730 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0] - 1); | |
33345d01 | 731 | if (key.objectid == ino && |
920bbbfb YZ |
732 | key.type == BTRFS_EXTENT_DATA_KEY) |
733 | path->slots[0]--; | |
39279cc3 | 734 | } |
920bbbfb | 735 | ret = 0; |
8c2383c3 | 736 | next_slot: |
5f39d397 | 737 | leaf = path->nodes[0]; |
920bbbfb YZ |
738 | if (path->slots[0] >= btrfs_header_nritems(leaf)) { |
739 | BUG_ON(del_nr > 0); | |
740 | ret = btrfs_next_leaf(root, path); | |
741 | if (ret < 0) | |
742 | break; | |
743 | if (ret > 0) { | |
744 | ret = 0; | |
745 | break; | |
8c2383c3 | 746 | } |
920bbbfb YZ |
747 | leaf = path->nodes[0]; |
748 | recow = 1; | |
749 | } | |
750 | ||
751 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); | |
33345d01 | 752 | if (key.objectid > ino || |
920bbbfb YZ |
753 | key.type > BTRFS_EXTENT_DATA_KEY || key.offset >= end) |
754 | break; | |
755 | ||
756 | fi = btrfs_item_ptr(leaf, path->slots[0], | |
757 | struct btrfs_file_extent_item); | |
758 | extent_type = btrfs_file_extent_type(leaf, fi); | |
759 | ||
760 | if (extent_type == BTRFS_FILE_EXTENT_REG || | |
761 | extent_type == BTRFS_FILE_EXTENT_PREALLOC) { | |
762 | disk_bytenr = btrfs_file_extent_disk_bytenr(leaf, fi); | |
763 | num_bytes = btrfs_file_extent_disk_num_bytes(leaf, fi); | |
764 | extent_offset = btrfs_file_extent_offset(leaf, fi); | |
765 | extent_end = key.offset + | |
766 | btrfs_file_extent_num_bytes(leaf, fi); | |
767 | } else if (extent_type == BTRFS_FILE_EXTENT_INLINE) { | |
768 | extent_end = key.offset + | |
769 | btrfs_file_extent_inline_len(leaf, fi); | |
8c2383c3 | 770 | } else { |
920bbbfb | 771 | WARN_ON(1); |
8c2383c3 | 772 | extent_end = search_start; |
39279cc3 CM |
773 | } |
774 | ||
920bbbfb YZ |
775 | if (extent_end <= search_start) { |
776 | path->slots[0]++; | |
8c2383c3 | 777 | goto next_slot; |
39279cc3 CM |
778 | } |
779 | ||
c3308f84 | 780 | found = 1; |
920bbbfb | 781 | search_start = max(key.offset, start); |
dc7fdde3 CM |
782 | if (recow || !modify_tree) { |
783 | modify_tree = -1; | |
b3b4aa74 | 784 | btrfs_release_path(path); |
920bbbfb | 785 | continue; |
39279cc3 | 786 | } |
6643558d | 787 | |
920bbbfb YZ |
788 | /* |
789 | * | - range to drop - | | |
790 | * | -------- extent -------- | | |
791 | */ | |
792 | if (start > key.offset && end < extent_end) { | |
793 | BUG_ON(del_nr > 0); | |
794 | BUG_ON(extent_type == BTRFS_FILE_EXTENT_INLINE); | |
795 | ||
796 | memcpy(&new_key, &key, sizeof(new_key)); | |
797 | new_key.offset = start; | |
798 | ret = btrfs_duplicate_item(trans, root, path, | |
799 | &new_key); | |
800 | if (ret == -EAGAIN) { | |
b3b4aa74 | 801 | btrfs_release_path(path); |
920bbbfb | 802 | continue; |
6643558d | 803 | } |
920bbbfb YZ |
804 | if (ret < 0) |
805 | break; | |
806 | ||
807 | leaf = path->nodes[0]; | |
808 | fi = btrfs_item_ptr(leaf, path->slots[0] - 1, | |
809 | struct btrfs_file_extent_item); | |
810 | btrfs_set_file_extent_num_bytes(leaf, fi, | |
811 | start - key.offset); | |
812 | ||
813 | fi = btrfs_item_ptr(leaf, path->slots[0], | |
814 | struct btrfs_file_extent_item); | |
815 | ||
816 | extent_offset += start - key.offset; | |
817 | btrfs_set_file_extent_offset(leaf, fi, extent_offset); | |
818 | btrfs_set_file_extent_num_bytes(leaf, fi, | |
819 | extent_end - start); | |
820 | btrfs_mark_buffer_dirty(leaf); | |
821 | ||
5dc562c5 | 822 | if (update_refs && disk_bytenr > 0) { |
771ed689 | 823 | ret = btrfs_inc_extent_ref(trans, root, |
920bbbfb YZ |
824 | disk_bytenr, num_bytes, 0, |
825 | root->root_key.objectid, | |
826 | new_key.objectid, | |
66d7e7f0 | 827 | start - extent_offset, 0); |
79787eaa | 828 | BUG_ON(ret); /* -ENOMEM */ |
771ed689 | 829 | } |
920bbbfb | 830 | key.offset = start; |
6643558d | 831 | } |
920bbbfb YZ |
832 | /* |
833 | * | ---- range to drop ----- | | |
834 | * | -------- extent -------- | | |
835 | */ | |
836 | if (start <= key.offset && end < extent_end) { | |
837 | BUG_ON(extent_type == BTRFS_FILE_EXTENT_INLINE); | |
6643558d | 838 | |
920bbbfb YZ |
839 | memcpy(&new_key, &key, sizeof(new_key)); |
840 | new_key.offset = end; | |
afe5fea7 | 841 | btrfs_set_item_key_safe(root, path, &new_key); |
6643558d | 842 | |
920bbbfb YZ |
843 | extent_offset += end - key.offset; |
844 | btrfs_set_file_extent_offset(leaf, fi, extent_offset); | |
845 | btrfs_set_file_extent_num_bytes(leaf, fi, | |
846 | extent_end - end); | |
847 | btrfs_mark_buffer_dirty(leaf); | |
2671485d | 848 | if (update_refs && disk_bytenr > 0) |
920bbbfb | 849 | inode_sub_bytes(inode, end - key.offset); |
920bbbfb | 850 | break; |
39279cc3 | 851 | } |
771ed689 | 852 | |
920bbbfb YZ |
853 | search_start = extent_end; |
854 | /* | |
855 | * | ---- range to drop ----- | | |
856 | * | -------- extent -------- | | |
857 | */ | |
858 | if (start > key.offset && end >= extent_end) { | |
859 | BUG_ON(del_nr > 0); | |
860 | BUG_ON(extent_type == BTRFS_FILE_EXTENT_INLINE); | |
8c2383c3 | 861 | |
920bbbfb YZ |
862 | btrfs_set_file_extent_num_bytes(leaf, fi, |
863 | start - key.offset); | |
864 | btrfs_mark_buffer_dirty(leaf); | |
2671485d | 865 | if (update_refs && disk_bytenr > 0) |
920bbbfb | 866 | inode_sub_bytes(inode, extent_end - start); |
920bbbfb YZ |
867 | if (end == extent_end) |
868 | break; | |
c8b97818 | 869 | |
920bbbfb YZ |
870 | path->slots[0]++; |
871 | goto next_slot; | |
31840ae1 ZY |
872 | } |
873 | ||
920bbbfb YZ |
874 | /* |
875 | * | ---- range to drop ----- | | |
876 | * | ------ extent ------ | | |
877 | */ | |
878 | if (start <= key.offset && end >= extent_end) { | |
879 | if (del_nr == 0) { | |
880 | del_slot = path->slots[0]; | |
881 | del_nr = 1; | |
882 | } else { | |
883 | BUG_ON(del_slot + del_nr != path->slots[0]); | |
884 | del_nr++; | |
885 | } | |
31840ae1 | 886 | |
5dc562c5 JB |
887 | if (update_refs && |
888 | extent_type == BTRFS_FILE_EXTENT_INLINE) { | |
a76a3cd4 | 889 | inode_sub_bytes(inode, |
920bbbfb YZ |
890 | extent_end - key.offset); |
891 | extent_end = ALIGN(extent_end, | |
892 | root->sectorsize); | |
5dc562c5 | 893 | } else if (update_refs && disk_bytenr > 0) { |
31840ae1 | 894 | ret = btrfs_free_extent(trans, root, |
920bbbfb YZ |
895 | disk_bytenr, num_bytes, 0, |
896 | root->root_key.objectid, | |
5d4f98a2 | 897 | key.objectid, key.offset - |
66d7e7f0 | 898 | extent_offset, 0); |
79787eaa | 899 | BUG_ON(ret); /* -ENOMEM */ |
920bbbfb YZ |
900 | inode_sub_bytes(inode, |
901 | extent_end - key.offset); | |
31840ae1 | 902 | } |
31840ae1 | 903 | |
920bbbfb YZ |
904 | if (end == extent_end) |
905 | break; | |
906 | ||
907 | if (path->slots[0] + 1 < btrfs_header_nritems(leaf)) { | |
908 | path->slots[0]++; | |
909 | goto next_slot; | |
910 | } | |
911 | ||
912 | ret = btrfs_del_items(trans, root, path, del_slot, | |
913 | del_nr); | |
79787eaa JM |
914 | if (ret) { |
915 | btrfs_abort_transaction(trans, root, ret); | |
5dc562c5 | 916 | break; |
79787eaa | 917 | } |
920bbbfb YZ |
918 | |
919 | del_nr = 0; | |
920 | del_slot = 0; | |
921 | ||
b3b4aa74 | 922 | btrfs_release_path(path); |
920bbbfb | 923 | continue; |
39279cc3 | 924 | } |
920bbbfb YZ |
925 | |
926 | BUG_ON(1); | |
39279cc3 | 927 | } |
920bbbfb | 928 | |
79787eaa | 929 | if (!ret && del_nr > 0) { |
920bbbfb | 930 | ret = btrfs_del_items(trans, root, path, del_slot, del_nr); |
79787eaa JM |
931 | if (ret) |
932 | btrfs_abort_transaction(trans, root, ret); | |
6643558d | 933 | } |
920bbbfb | 934 | |
2aaa6655 | 935 | if (drop_end) |
c3308f84 | 936 | *drop_end = found ? min(end, extent_end) : end; |
5dc562c5 JB |
937 | btrfs_release_path(path); |
938 | return ret; | |
939 | } | |
940 | ||
941 | int btrfs_drop_extents(struct btrfs_trans_handle *trans, | |
942 | struct btrfs_root *root, struct inode *inode, u64 start, | |
2671485d | 943 | u64 end, int drop_cache) |
5dc562c5 JB |
944 | { |
945 | struct btrfs_path *path; | |
946 | int ret; | |
947 | ||
948 | path = btrfs_alloc_path(); | |
949 | if (!path) | |
950 | return -ENOMEM; | |
2aaa6655 | 951 | ret = __btrfs_drop_extents(trans, root, inode, path, start, end, NULL, |
2671485d | 952 | drop_cache); |
920bbbfb | 953 | btrfs_free_path(path); |
39279cc3 CM |
954 | return ret; |
955 | } | |
956 | ||
d899e052 | 957 | static int extent_mergeable(struct extent_buffer *leaf, int slot, |
6c7d54ac YZ |
958 | u64 objectid, u64 bytenr, u64 orig_offset, |
959 | u64 *start, u64 *end) | |
d899e052 YZ |
960 | { |
961 | struct btrfs_file_extent_item *fi; | |
962 | struct btrfs_key key; | |
963 | u64 extent_end; | |
964 | ||
965 | if (slot < 0 || slot >= btrfs_header_nritems(leaf)) | |
966 | return 0; | |
967 | ||
968 | btrfs_item_key_to_cpu(leaf, &key, slot); | |
969 | if (key.objectid != objectid || key.type != BTRFS_EXTENT_DATA_KEY) | |
970 | return 0; | |
971 | ||
972 | fi = btrfs_item_ptr(leaf, slot, struct btrfs_file_extent_item); | |
973 | if (btrfs_file_extent_type(leaf, fi) != BTRFS_FILE_EXTENT_REG || | |
974 | btrfs_file_extent_disk_bytenr(leaf, fi) != bytenr || | |
6c7d54ac | 975 | btrfs_file_extent_offset(leaf, fi) != key.offset - orig_offset || |
d899e052 YZ |
976 | btrfs_file_extent_compression(leaf, fi) || |
977 | btrfs_file_extent_encryption(leaf, fi) || | |
978 | btrfs_file_extent_other_encoding(leaf, fi)) | |
979 | return 0; | |
980 | ||
981 | extent_end = key.offset + btrfs_file_extent_num_bytes(leaf, fi); | |
982 | if ((*start && *start != key.offset) || (*end && *end != extent_end)) | |
983 | return 0; | |
984 | ||
985 | *start = key.offset; | |
986 | *end = extent_end; | |
987 | return 1; | |
988 | } | |
989 | ||
990 | /* | |
991 | * Mark extent in the range start - end as written. | |
992 | * | |
993 | * This changes extent type from 'pre-allocated' to 'regular'. If only | |
994 | * part of extent is marked as written, the extent will be split into | |
995 | * two or three. | |
996 | */ | |
997 | int btrfs_mark_extent_written(struct btrfs_trans_handle *trans, | |
d899e052 YZ |
998 | struct inode *inode, u64 start, u64 end) |
999 | { | |
920bbbfb | 1000 | struct btrfs_root *root = BTRFS_I(inode)->root; |
d899e052 YZ |
1001 | struct extent_buffer *leaf; |
1002 | struct btrfs_path *path; | |
1003 | struct btrfs_file_extent_item *fi; | |
1004 | struct btrfs_key key; | |
920bbbfb | 1005 | struct btrfs_key new_key; |
d899e052 YZ |
1006 | u64 bytenr; |
1007 | u64 num_bytes; | |
1008 | u64 extent_end; | |
5d4f98a2 | 1009 | u64 orig_offset; |
d899e052 YZ |
1010 | u64 other_start; |
1011 | u64 other_end; | |
920bbbfb YZ |
1012 | u64 split; |
1013 | int del_nr = 0; | |
1014 | int del_slot = 0; | |
6c7d54ac | 1015 | int recow; |
d899e052 | 1016 | int ret; |
33345d01 | 1017 | u64 ino = btrfs_ino(inode); |
d899e052 | 1018 | |
d899e052 | 1019 | path = btrfs_alloc_path(); |
d8926bb3 MF |
1020 | if (!path) |
1021 | return -ENOMEM; | |
d899e052 | 1022 | again: |
6c7d54ac | 1023 | recow = 0; |
920bbbfb | 1024 | split = start; |
33345d01 | 1025 | key.objectid = ino; |
d899e052 | 1026 | key.type = BTRFS_EXTENT_DATA_KEY; |
920bbbfb | 1027 | key.offset = split; |
d899e052 YZ |
1028 | |
1029 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); | |
41415730 JB |
1030 | if (ret < 0) |
1031 | goto out; | |
d899e052 YZ |
1032 | if (ret > 0 && path->slots[0] > 0) |
1033 | path->slots[0]--; | |
1034 | ||
1035 | leaf = path->nodes[0]; | |
1036 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); | |
33345d01 | 1037 | BUG_ON(key.objectid != ino || key.type != BTRFS_EXTENT_DATA_KEY); |
d899e052 YZ |
1038 | fi = btrfs_item_ptr(leaf, path->slots[0], |
1039 | struct btrfs_file_extent_item); | |
920bbbfb YZ |
1040 | BUG_ON(btrfs_file_extent_type(leaf, fi) != |
1041 | BTRFS_FILE_EXTENT_PREALLOC); | |
d899e052 YZ |
1042 | extent_end = key.offset + btrfs_file_extent_num_bytes(leaf, fi); |
1043 | BUG_ON(key.offset > start || extent_end < end); | |
1044 | ||
1045 | bytenr = btrfs_file_extent_disk_bytenr(leaf, fi); | |
1046 | num_bytes = btrfs_file_extent_disk_num_bytes(leaf, fi); | |
5d4f98a2 | 1047 | orig_offset = key.offset - btrfs_file_extent_offset(leaf, fi); |
6c7d54ac YZ |
1048 | memcpy(&new_key, &key, sizeof(new_key)); |
1049 | ||
1050 | if (start == key.offset && end < extent_end) { | |
1051 | other_start = 0; | |
1052 | other_end = start; | |
1053 | if (extent_mergeable(leaf, path->slots[0] - 1, | |
33345d01 | 1054 | ino, bytenr, orig_offset, |
6c7d54ac YZ |
1055 | &other_start, &other_end)) { |
1056 | new_key.offset = end; | |
afe5fea7 | 1057 | btrfs_set_item_key_safe(root, path, &new_key); |
6c7d54ac YZ |
1058 | fi = btrfs_item_ptr(leaf, path->slots[0], |
1059 | struct btrfs_file_extent_item); | |
224ecce5 JB |
1060 | btrfs_set_file_extent_generation(leaf, fi, |
1061 | trans->transid); | |
6c7d54ac YZ |
1062 | btrfs_set_file_extent_num_bytes(leaf, fi, |
1063 | extent_end - end); | |
1064 | btrfs_set_file_extent_offset(leaf, fi, | |
1065 | end - orig_offset); | |
1066 | fi = btrfs_item_ptr(leaf, path->slots[0] - 1, | |
1067 | struct btrfs_file_extent_item); | |
224ecce5 JB |
1068 | btrfs_set_file_extent_generation(leaf, fi, |
1069 | trans->transid); | |
6c7d54ac YZ |
1070 | btrfs_set_file_extent_num_bytes(leaf, fi, |
1071 | end - other_start); | |
1072 | btrfs_mark_buffer_dirty(leaf); | |
1073 | goto out; | |
1074 | } | |
1075 | } | |
1076 | ||
1077 | if (start > key.offset && end == extent_end) { | |
1078 | other_start = end; | |
1079 | other_end = 0; | |
1080 | if (extent_mergeable(leaf, path->slots[0] + 1, | |
33345d01 | 1081 | ino, bytenr, orig_offset, |
6c7d54ac YZ |
1082 | &other_start, &other_end)) { |
1083 | fi = btrfs_item_ptr(leaf, path->slots[0], | |
1084 | struct btrfs_file_extent_item); | |
1085 | btrfs_set_file_extent_num_bytes(leaf, fi, | |
1086 | start - key.offset); | |
224ecce5 JB |
1087 | btrfs_set_file_extent_generation(leaf, fi, |
1088 | trans->transid); | |
6c7d54ac YZ |
1089 | path->slots[0]++; |
1090 | new_key.offset = start; | |
afe5fea7 | 1091 | btrfs_set_item_key_safe(root, path, &new_key); |
6c7d54ac YZ |
1092 | |
1093 | fi = btrfs_item_ptr(leaf, path->slots[0], | |
1094 | struct btrfs_file_extent_item); | |
224ecce5 JB |
1095 | btrfs_set_file_extent_generation(leaf, fi, |
1096 | trans->transid); | |
6c7d54ac YZ |
1097 | btrfs_set_file_extent_num_bytes(leaf, fi, |
1098 | other_end - start); | |
1099 | btrfs_set_file_extent_offset(leaf, fi, | |
1100 | start - orig_offset); | |
1101 | btrfs_mark_buffer_dirty(leaf); | |
1102 | goto out; | |
1103 | } | |
1104 | } | |
d899e052 | 1105 | |
920bbbfb YZ |
1106 | while (start > key.offset || end < extent_end) { |
1107 | if (key.offset == start) | |
1108 | split = end; | |
1109 | ||
920bbbfb YZ |
1110 | new_key.offset = split; |
1111 | ret = btrfs_duplicate_item(trans, root, path, &new_key); | |
1112 | if (ret == -EAGAIN) { | |
b3b4aa74 | 1113 | btrfs_release_path(path); |
920bbbfb | 1114 | goto again; |
d899e052 | 1115 | } |
79787eaa JM |
1116 | if (ret < 0) { |
1117 | btrfs_abort_transaction(trans, root, ret); | |
1118 | goto out; | |
1119 | } | |
d899e052 | 1120 | |
920bbbfb YZ |
1121 | leaf = path->nodes[0]; |
1122 | fi = btrfs_item_ptr(leaf, path->slots[0] - 1, | |
d899e052 | 1123 | struct btrfs_file_extent_item); |
224ecce5 | 1124 | btrfs_set_file_extent_generation(leaf, fi, trans->transid); |
d899e052 | 1125 | btrfs_set_file_extent_num_bytes(leaf, fi, |
920bbbfb YZ |
1126 | split - key.offset); |
1127 | ||
1128 | fi = btrfs_item_ptr(leaf, path->slots[0], | |
1129 | struct btrfs_file_extent_item); | |
1130 | ||
224ecce5 | 1131 | btrfs_set_file_extent_generation(leaf, fi, trans->transid); |
920bbbfb YZ |
1132 | btrfs_set_file_extent_offset(leaf, fi, split - orig_offset); |
1133 | btrfs_set_file_extent_num_bytes(leaf, fi, | |
1134 | extent_end - split); | |
d899e052 YZ |
1135 | btrfs_mark_buffer_dirty(leaf); |
1136 | ||
920bbbfb YZ |
1137 | ret = btrfs_inc_extent_ref(trans, root, bytenr, num_bytes, 0, |
1138 | root->root_key.objectid, | |
66d7e7f0 | 1139 | ino, orig_offset, 0); |
79787eaa | 1140 | BUG_ON(ret); /* -ENOMEM */ |
d899e052 | 1141 | |
920bbbfb YZ |
1142 | if (split == start) { |
1143 | key.offset = start; | |
1144 | } else { | |
1145 | BUG_ON(start != key.offset); | |
d899e052 | 1146 | path->slots[0]--; |
920bbbfb | 1147 | extent_end = end; |
d899e052 | 1148 | } |
6c7d54ac | 1149 | recow = 1; |
d899e052 YZ |
1150 | } |
1151 | ||
920bbbfb YZ |
1152 | other_start = end; |
1153 | other_end = 0; | |
6c7d54ac | 1154 | if (extent_mergeable(leaf, path->slots[0] + 1, |
33345d01 | 1155 | ino, bytenr, orig_offset, |
6c7d54ac YZ |
1156 | &other_start, &other_end)) { |
1157 | if (recow) { | |
b3b4aa74 | 1158 | btrfs_release_path(path); |
6c7d54ac YZ |
1159 | goto again; |
1160 | } | |
920bbbfb YZ |
1161 | extent_end = other_end; |
1162 | del_slot = path->slots[0] + 1; | |
1163 | del_nr++; | |
1164 | ret = btrfs_free_extent(trans, root, bytenr, num_bytes, | |
1165 | 0, root->root_key.objectid, | |
66d7e7f0 | 1166 | ino, orig_offset, 0); |
79787eaa | 1167 | BUG_ON(ret); /* -ENOMEM */ |
d899e052 | 1168 | } |
920bbbfb YZ |
1169 | other_start = 0; |
1170 | other_end = start; | |
6c7d54ac | 1171 | if (extent_mergeable(leaf, path->slots[0] - 1, |
33345d01 | 1172 | ino, bytenr, orig_offset, |
6c7d54ac YZ |
1173 | &other_start, &other_end)) { |
1174 | if (recow) { | |
b3b4aa74 | 1175 | btrfs_release_path(path); |
6c7d54ac YZ |
1176 | goto again; |
1177 | } | |
920bbbfb YZ |
1178 | key.offset = other_start; |
1179 | del_slot = path->slots[0]; | |
1180 | del_nr++; | |
1181 | ret = btrfs_free_extent(trans, root, bytenr, num_bytes, | |
1182 | 0, root->root_key.objectid, | |
66d7e7f0 | 1183 | ino, orig_offset, 0); |
79787eaa | 1184 | BUG_ON(ret); /* -ENOMEM */ |
920bbbfb YZ |
1185 | } |
1186 | if (del_nr == 0) { | |
3f6fae95 SL |
1187 | fi = btrfs_item_ptr(leaf, path->slots[0], |
1188 | struct btrfs_file_extent_item); | |
920bbbfb YZ |
1189 | btrfs_set_file_extent_type(leaf, fi, |
1190 | BTRFS_FILE_EXTENT_REG); | |
224ecce5 | 1191 | btrfs_set_file_extent_generation(leaf, fi, trans->transid); |
920bbbfb | 1192 | btrfs_mark_buffer_dirty(leaf); |
6c7d54ac | 1193 | } else { |
3f6fae95 SL |
1194 | fi = btrfs_item_ptr(leaf, del_slot - 1, |
1195 | struct btrfs_file_extent_item); | |
6c7d54ac YZ |
1196 | btrfs_set_file_extent_type(leaf, fi, |
1197 | BTRFS_FILE_EXTENT_REG); | |
224ecce5 | 1198 | btrfs_set_file_extent_generation(leaf, fi, trans->transid); |
6c7d54ac YZ |
1199 | btrfs_set_file_extent_num_bytes(leaf, fi, |
1200 | extent_end - key.offset); | |
1201 | btrfs_mark_buffer_dirty(leaf); | |
920bbbfb | 1202 | |
6c7d54ac | 1203 | ret = btrfs_del_items(trans, root, path, del_slot, del_nr); |
79787eaa JM |
1204 | if (ret < 0) { |
1205 | btrfs_abort_transaction(trans, root, ret); | |
1206 | goto out; | |
1207 | } | |
6c7d54ac | 1208 | } |
920bbbfb | 1209 | out: |
d899e052 YZ |
1210 | btrfs_free_path(path); |
1211 | return 0; | |
1212 | } | |
1213 | ||
b1bf862e CM |
1214 | /* |
1215 | * on error we return an unlocked page and the error value | |
1216 | * on success we return a locked page and 0 | |
1217 | */ | |
b6316429 JB |
1218 | static int prepare_uptodate_page(struct page *page, u64 pos, |
1219 | bool force_uptodate) | |
b1bf862e CM |
1220 | { |
1221 | int ret = 0; | |
1222 | ||
b6316429 JB |
1223 | if (((pos & (PAGE_CACHE_SIZE - 1)) || force_uptodate) && |
1224 | !PageUptodate(page)) { | |
b1bf862e CM |
1225 | ret = btrfs_readpage(NULL, page); |
1226 | if (ret) | |
1227 | return ret; | |
1228 | lock_page(page); | |
1229 | if (!PageUptodate(page)) { | |
1230 | unlock_page(page); | |
1231 | return -EIO; | |
1232 | } | |
1233 | } | |
1234 | return 0; | |
1235 | } | |
1236 | ||
39279cc3 | 1237 | /* |
d352ac68 CM |
1238 | * this gets pages into the page cache and locks them down, it also properly |
1239 | * waits for data=ordered extents to finish before allowing the pages to be | |
1240 | * modified. | |
39279cc3 | 1241 | */ |
d397712b | 1242 | static noinline int prepare_pages(struct btrfs_root *root, struct file *file, |
98ed5174 CM |
1243 | struct page **pages, size_t num_pages, |
1244 | loff_t pos, unsigned long first_index, | |
b6316429 | 1245 | size_t write_bytes, bool force_uptodate) |
39279cc3 | 1246 | { |
2ac55d41 | 1247 | struct extent_state *cached_state = NULL; |
39279cc3 CM |
1248 | int i; |
1249 | unsigned long index = pos >> PAGE_CACHE_SHIFT; | |
496ad9aa | 1250 | struct inode *inode = file_inode(file); |
3b16a4e3 | 1251 | gfp_t mask = btrfs_alloc_write_mask(inode->i_mapping); |
39279cc3 | 1252 | int err = 0; |
b1bf862e | 1253 | int faili = 0; |
8c2383c3 | 1254 | u64 start_pos; |
e6dcd2dc | 1255 | u64 last_pos; |
8c2383c3 | 1256 | |
5f39d397 | 1257 | start_pos = pos & ~((u64)root->sectorsize - 1); |
e6dcd2dc | 1258 | last_pos = ((u64)index + num_pages) << PAGE_CACHE_SHIFT; |
39279cc3 | 1259 | |
e6dcd2dc | 1260 | again: |
39279cc3 | 1261 | for (i = 0; i < num_pages; i++) { |
a94733d0 | 1262 | pages[i] = find_or_create_page(inode->i_mapping, index + i, |
e3a41a5b | 1263 | mask | __GFP_WRITE); |
39279cc3 | 1264 | if (!pages[i]) { |
b1bf862e CM |
1265 | faili = i - 1; |
1266 | err = -ENOMEM; | |
1267 | goto fail; | |
1268 | } | |
1269 | ||
1270 | if (i == 0) | |
b6316429 JB |
1271 | err = prepare_uptodate_page(pages[i], pos, |
1272 | force_uptodate); | |
b1bf862e CM |
1273 | if (i == num_pages - 1) |
1274 | err = prepare_uptodate_page(pages[i], | |
b6316429 | 1275 | pos + write_bytes, false); |
b1bf862e CM |
1276 | if (err) { |
1277 | page_cache_release(pages[i]); | |
1278 | faili = i - 1; | |
1279 | goto fail; | |
39279cc3 | 1280 | } |
ccd467d6 | 1281 | wait_on_page_writeback(pages[i]); |
39279cc3 | 1282 | } |
0ef8b726 | 1283 | faili = num_pages - 1; |
b1bf862e | 1284 | err = 0; |
0762704b | 1285 | if (start_pos < inode->i_size) { |
e6dcd2dc | 1286 | struct btrfs_ordered_extent *ordered; |
2ac55d41 | 1287 | lock_extent_bits(&BTRFS_I(inode)->io_tree, |
d0082371 | 1288 | start_pos, last_pos - 1, 0, &cached_state); |
d397712b CM |
1289 | ordered = btrfs_lookup_first_ordered_extent(inode, |
1290 | last_pos - 1); | |
e6dcd2dc CM |
1291 | if (ordered && |
1292 | ordered->file_offset + ordered->len > start_pos && | |
1293 | ordered->file_offset < last_pos) { | |
1294 | btrfs_put_ordered_extent(ordered); | |
2ac55d41 JB |
1295 | unlock_extent_cached(&BTRFS_I(inode)->io_tree, |
1296 | start_pos, last_pos - 1, | |
1297 | &cached_state, GFP_NOFS); | |
e6dcd2dc CM |
1298 | for (i = 0; i < num_pages; i++) { |
1299 | unlock_page(pages[i]); | |
1300 | page_cache_release(pages[i]); | |
1301 | } | |
0ef8b726 JB |
1302 | err = btrfs_wait_ordered_range(inode, start_pos, |
1303 | last_pos - start_pos); | |
1304 | if (err) | |
1305 | goto fail; | |
e6dcd2dc CM |
1306 | goto again; |
1307 | } | |
1308 | if (ordered) | |
1309 | btrfs_put_ordered_extent(ordered); | |
1310 | ||
2ac55d41 | 1311 | clear_extent_bit(&BTRFS_I(inode)->io_tree, start_pos, |
32c00aff | 1312 | last_pos - 1, EXTENT_DIRTY | EXTENT_DELALLOC | |
9e8a4a8b LB |
1313 | EXTENT_DO_ACCOUNTING | EXTENT_DEFRAG, |
1314 | 0, 0, &cached_state, GFP_NOFS); | |
2ac55d41 JB |
1315 | unlock_extent_cached(&BTRFS_I(inode)->io_tree, |
1316 | start_pos, last_pos - 1, &cached_state, | |
1317 | GFP_NOFS); | |
0762704b | 1318 | } |
e6dcd2dc | 1319 | for (i = 0; i < num_pages; i++) { |
32c7f202 WF |
1320 | if (clear_page_dirty_for_io(pages[i])) |
1321 | account_page_redirty(pages[i]); | |
e6dcd2dc CM |
1322 | set_page_extent_mapped(pages[i]); |
1323 | WARN_ON(!PageLocked(pages[i])); | |
1324 | } | |
39279cc3 | 1325 | return 0; |
b1bf862e CM |
1326 | fail: |
1327 | while (faili >= 0) { | |
1328 | unlock_page(pages[faili]); | |
1329 | page_cache_release(pages[faili]); | |
1330 | faili--; | |
1331 | } | |
1332 | return err; | |
1333 | ||
39279cc3 CM |
1334 | } |
1335 | ||
7ee9e440 JB |
1336 | static noinline int check_can_nocow(struct inode *inode, loff_t pos, |
1337 | size_t *write_bytes) | |
1338 | { | |
7ee9e440 JB |
1339 | struct btrfs_root *root = BTRFS_I(inode)->root; |
1340 | struct btrfs_ordered_extent *ordered; | |
1341 | u64 lockstart, lockend; | |
1342 | u64 num_bytes; | |
1343 | int ret; | |
1344 | ||
1345 | lockstart = round_down(pos, root->sectorsize); | |
1346 | lockend = lockstart + round_up(*write_bytes, root->sectorsize) - 1; | |
1347 | ||
1348 | while (1) { | |
1349 | lock_extent(&BTRFS_I(inode)->io_tree, lockstart, lockend); | |
1350 | ordered = btrfs_lookup_ordered_range(inode, lockstart, | |
1351 | lockend - lockstart + 1); | |
1352 | if (!ordered) { | |
1353 | break; | |
1354 | } | |
1355 | unlock_extent(&BTRFS_I(inode)->io_tree, lockstart, lockend); | |
1356 | btrfs_start_ordered_extent(inode, ordered, 1); | |
1357 | btrfs_put_ordered_extent(ordered); | |
1358 | } | |
1359 | ||
7ee9e440 | 1360 | num_bytes = lockend - lockstart + 1; |
00361589 | 1361 | ret = can_nocow_extent(inode, lockstart, &num_bytes, NULL, NULL, NULL); |
7ee9e440 JB |
1362 | if (ret <= 0) { |
1363 | ret = 0; | |
1364 | } else { | |
1365 | clear_extent_bit(&BTRFS_I(inode)->io_tree, lockstart, lockend, | |
1366 | EXTENT_DIRTY | EXTENT_DELALLOC | | |
1367 | EXTENT_DO_ACCOUNTING | EXTENT_DEFRAG, 0, 0, | |
1368 | NULL, GFP_NOFS); | |
1369 | *write_bytes = min_t(size_t, *write_bytes, num_bytes); | |
1370 | } | |
1371 | ||
1372 | unlock_extent(&BTRFS_I(inode)->io_tree, lockstart, lockend); | |
1373 | ||
1374 | return ret; | |
1375 | } | |
1376 | ||
d0215f3e JB |
1377 | static noinline ssize_t __btrfs_buffered_write(struct file *file, |
1378 | struct iov_iter *i, | |
1379 | loff_t pos) | |
4b46fce2 | 1380 | { |
496ad9aa | 1381 | struct inode *inode = file_inode(file); |
11c65dcc | 1382 | struct btrfs_root *root = BTRFS_I(inode)->root; |
11c65dcc | 1383 | struct page **pages = NULL; |
7ee9e440 | 1384 | u64 release_bytes = 0; |
39279cc3 | 1385 | unsigned long first_index; |
d0215f3e JB |
1386 | size_t num_written = 0; |
1387 | int nrptrs; | |
c9149235 | 1388 | int ret = 0; |
7ee9e440 | 1389 | bool only_release_metadata = false; |
b6316429 | 1390 | bool force_page_uptodate = false; |
4b46fce2 | 1391 | |
d0215f3e | 1392 | nrptrs = min((iov_iter_count(i) + PAGE_CACHE_SIZE - 1) / |
11c65dcc JB |
1393 | PAGE_CACHE_SIZE, PAGE_CACHE_SIZE / |
1394 | (sizeof(struct page *))); | |
142349f5 WF |
1395 | nrptrs = min(nrptrs, current->nr_dirtied_pause - current->nr_dirtied); |
1396 | nrptrs = max(nrptrs, 8); | |
8c2383c3 | 1397 | pages = kmalloc(nrptrs * sizeof(struct page *), GFP_KERNEL); |
d0215f3e JB |
1398 | if (!pages) |
1399 | return -ENOMEM; | |
ab93dbec | 1400 | |
39279cc3 | 1401 | first_index = pos >> PAGE_CACHE_SHIFT; |
39279cc3 | 1402 | |
d0215f3e | 1403 | while (iov_iter_count(i) > 0) { |
39279cc3 | 1404 | size_t offset = pos & (PAGE_CACHE_SIZE - 1); |
d0215f3e | 1405 | size_t write_bytes = min(iov_iter_count(i), |
11c65dcc | 1406 | nrptrs * (size_t)PAGE_CACHE_SIZE - |
8c2383c3 | 1407 | offset); |
3a90983d YZ |
1408 | size_t num_pages = (write_bytes + offset + |
1409 | PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT; | |
7ee9e440 | 1410 | size_t reserve_bytes; |
d0215f3e JB |
1411 | size_t dirty_pages; |
1412 | size_t copied; | |
39279cc3 | 1413 | |
8c2383c3 | 1414 | WARN_ON(num_pages > nrptrs); |
1832a6d5 | 1415 | |
914ee295 XZ |
1416 | /* |
1417 | * Fault pages before locking them in prepare_pages | |
1418 | * to avoid recursive lock | |
1419 | */ | |
d0215f3e | 1420 | if (unlikely(iov_iter_fault_in_readable(i, write_bytes))) { |
914ee295 | 1421 | ret = -EFAULT; |
d0215f3e | 1422 | break; |
914ee295 XZ |
1423 | } |
1424 | ||
7ee9e440 JB |
1425 | reserve_bytes = num_pages << PAGE_CACHE_SHIFT; |
1426 | ret = btrfs_check_data_free_space(inode, reserve_bytes); | |
1427 | if (ret == -ENOSPC && | |
1428 | (BTRFS_I(inode)->flags & (BTRFS_INODE_NODATACOW | | |
1429 | BTRFS_INODE_PREALLOC))) { | |
1430 | ret = check_can_nocow(inode, pos, &write_bytes); | |
1431 | if (ret > 0) { | |
1432 | only_release_metadata = true; | |
1433 | /* | |
1434 | * our prealloc extent may be smaller than | |
1435 | * write_bytes, so scale down. | |
1436 | */ | |
1437 | num_pages = (write_bytes + offset + | |
1438 | PAGE_CACHE_SIZE - 1) >> | |
1439 | PAGE_CACHE_SHIFT; | |
1440 | reserve_bytes = num_pages << PAGE_CACHE_SHIFT; | |
1441 | ret = 0; | |
1442 | } else { | |
1443 | ret = -ENOSPC; | |
1444 | } | |
1445 | } | |
1446 | ||
1832a6d5 | 1447 | if (ret) |
d0215f3e | 1448 | break; |
1832a6d5 | 1449 | |
7ee9e440 JB |
1450 | ret = btrfs_delalloc_reserve_metadata(inode, reserve_bytes); |
1451 | if (ret) { | |
1452 | if (!only_release_metadata) | |
1453 | btrfs_free_reserved_data_space(inode, | |
1454 | reserve_bytes); | |
1455 | break; | |
1456 | } | |
1457 | ||
1458 | release_bytes = reserve_bytes; | |
1459 | ||
4a64001f JB |
1460 | /* |
1461 | * This is going to setup the pages array with the number of | |
1462 | * pages we want, so we don't really need to worry about the | |
1463 | * contents of pages from loop to loop | |
1464 | */ | |
39279cc3 | 1465 | ret = prepare_pages(root, file, pages, num_pages, |
b6316429 JB |
1466 | pos, first_index, write_bytes, |
1467 | force_page_uptodate); | |
7ee9e440 | 1468 | if (ret) |
d0215f3e | 1469 | break; |
39279cc3 | 1470 | |
914ee295 | 1471 | copied = btrfs_copy_from_user(pos, num_pages, |
d0215f3e | 1472 | write_bytes, pages, i); |
b1bf862e CM |
1473 | |
1474 | /* | |
1475 | * if we have trouble faulting in the pages, fall | |
1476 | * back to one page at a time | |
1477 | */ | |
1478 | if (copied < write_bytes) | |
1479 | nrptrs = 1; | |
1480 | ||
b6316429 JB |
1481 | if (copied == 0) { |
1482 | force_page_uptodate = true; | |
b1bf862e | 1483 | dirty_pages = 0; |
b6316429 JB |
1484 | } else { |
1485 | force_page_uptodate = false; | |
b1bf862e CM |
1486 | dirty_pages = (copied + offset + |
1487 | PAGE_CACHE_SIZE - 1) >> | |
1488 | PAGE_CACHE_SHIFT; | |
b6316429 | 1489 | } |
914ee295 | 1490 | |
d0215f3e JB |
1491 | /* |
1492 | * If we had a short copy we need to release the excess delaloc | |
1493 | * bytes we reserved. We need to increment outstanding_extents | |
1494 | * because btrfs_delalloc_release_space will decrement it, but | |
1495 | * we still have an outstanding extent for the chunk we actually | |
1496 | * managed to copy. | |
1497 | */ | |
914ee295 | 1498 | if (num_pages > dirty_pages) { |
7ee9e440 JB |
1499 | release_bytes = (num_pages - dirty_pages) << |
1500 | PAGE_CACHE_SHIFT; | |
9e0baf60 JB |
1501 | if (copied > 0) { |
1502 | spin_lock(&BTRFS_I(inode)->lock); | |
1503 | BTRFS_I(inode)->outstanding_extents++; | |
1504 | spin_unlock(&BTRFS_I(inode)->lock); | |
1505 | } | |
7ee9e440 JB |
1506 | if (only_release_metadata) |
1507 | btrfs_delalloc_release_metadata(inode, | |
1508 | release_bytes); | |
1509 | else | |
1510 | btrfs_delalloc_release_space(inode, | |
1511 | release_bytes); | |
914ee295 XZ |
1512 | } |
1513 | ||
7ee9e440 | 1514 | release_bytes = dirty_pages << PAGE_CACHE_SHIFT; |
914ee295 | 1515 | if (copied > 0) { |
be1a12a0 JB |
1516 | ret = btrfs_dirty_pages(root, inode, pages, |
1517 | dirty_pages, pos, copied, | |
1518 | NULL); | |
d0215f3e | 1519 | if (ret) { |
d0215f3e JB |
1520 | btrfs_drop_pages(pages, num_pages); |
1521 | break; | |
1522 | } | |
54aa1f4d | 1523 | } |
39279cc3 | 1524 | |
7ee9e440 | 1525 | release_bytes = 0; |
39279cc3 CM |
1526 | btrfs_drop_pages(pages, num_pages); |
1527 | ||
7ee9e440 JB |
1528 | if (only_release_metadata && copied > 0) { |
1529 | u64 lockstart = round_down(pos, root->sectorsize); | |
1530 | u64 lockend = lockstart + | |
1531 | (dirty_pages << PAGE_CACHE_SHIFT) - 1; | |
1532 | ||
1533 | set_extent_bit(&BTRFS_I(inode)->io_tree, lockstart, | |
1534 | lockend, EXTENT_NORESERVE, NULL, | |
1535 | NULL, GFP_NOFS); | |
1536 | only_release_metadata = false; | |
1537 | } | |
1538 | ||
d0215f3e JB |
1539 | cond_resched(); |
1540 | ||
d0e1d66b | 1541 | balance_dirty_pages_ratelimited(inode->i_mapping); |
d0215f3e | 1542 | if (dirty_pages < (root->leafsize >> PAGE_CACHE_SHIFT) + 1) |
b53d3f5d | 1543 | btrfs_btree_balance_dirty(root); |
cb843a6f | 1544 | |
914ee295 XZ |
1545 | pos += copied; |
1546 | num_written += copied; | |
d0215f3e | 1547 | } |
39279cc3 | 1548 | |
d0215f3e JB |
1549 | kfree(pages); |
1550 | ||
7ee9e440 JB |
1551 | if (release_bytes) { |
1552 | if (only_release_metadata) | |
1553 | btrfs_delalloc_release_metadata(inode, release_bytes); | |
1554 | else | |
1555 | btrfs_delalloc_release_space(inode, release_bytes); | |
1556 | } | |
1557 | ||
d0215f3e JB |
1558 | return num_written ? num_written : ret; |
1559 | } | |
1560 | ||
1561 | static ssize_t __btrfs_direct_write(struct kiocb *iocb, | |
1562 | const struct iovec *iov, | |
1563 | unsigned long nr_segs, loff_t pos, | |
1564 | loff_t *ppos, size_t count, size_t ocount) | |
1565 | { | |
1566 | struct file *file = iocb->ki_filp; | |
d0215f3e JB |
1567 | struct iov_iter i; |
1568 | ssize_t written; | |
1569 | ssize_t written_buffered; | |
1570 | loff_t endbyte; | |
1571 | int err; | |
1572 | ||
1573 | written = generic_file_direct_write(iocb, iov, &nr_segs, pos, ppos, | |
1574 | count, ocount); | |
1575 | ||
d0215f3e JB |
1576 | if (written < 0 || written == count) |
1577 | return written; | |
1578 | ||
1579 | pos += written; | |
1580 | count -= written; | |
1581 | iov_iter_init(&i, iov, nr_segs, count, written); | |
1582 | written_buffered = __btrfs_buffered_write(file, &i, pos); | |
1583 | if (written_buffered < 0) { | |
1584 | err = written_buffered; | |
1585 | goto out; | |
39279cc3 | 1586 | } |
d0215f3e JB |
1587 | endbyte = pos + written_buffered - 1; |
1588 | err = filemap_write_and_wait_range(file->f_mapping, pos, endbyte); | |
1589 | if (err) | |
1590 | goto out; | |
1591 | written += written_buffered; | |
1592 | *ppos = pos + written_buffered; | |
1593 | invalidate_mapping_pages(file->f_mapping, pos >> PAGE_CACHE_SHIFT, | |
1594 | endbyte >> PAGE_CACHE_SHIFT); | |
39279cc3 | 1595 | out: |
d0215f3e JB |
1596 | return written ? written : err; |
1597 | } | |
5b92ee72 | 1598 | |
6c760c07 JB |
1599 | static void update_time_for_write(struct inode *inode) |
1600 | { | |
1601 | struct timespec now; | |
1602 | ||
1603 | if (IS_NOCMTIME(inode)) | |
1604 | return; | |
1605 | ||
1606 | now = current_fs_time(inode->i_sb); | |
1607 | if (!timespec_equal(&inode->i_mtime, &now)) | |
1608 | inode->i_mtime = now; | |
1609 | ||
1610 | if (!timespec_equal(&inode->i_ctime, &now)) | |
1611 | inode->i_ctime = now; | |
1612 | ||
1613 | if (IS_I_VERSION(inode)) | |
1614 | inode_inc_iversion(inode); | |
1615 | } | |
1616 | ||
d0215f3e JB |
1617 | static ssize_t btrfs_file_aio_write(struct kiocb *iocb, |
1618 | const struct iovec *iov, | |
1619 | unsigned long nr_segs, loff_t pos) | |
1620 | { | |
1621 | struct file *file = iocb->ki_filp; | |
496ad9aa | 1622 | struct inode *inode = file_inode(file); |
d0215f3e JB |
1623 | struct btrfs_root *root = BTRFS_I(inode)->root; |
1624 | loff_t *ppos = &iocb->ki_pos; | |
0c1a98c8 | 1625 | u64 start_pos; |
d0215f3e JB |
1626 | ssize_t num_written = 0; |
1627 | ssize_t err = 0; | |
1628 | size_t count, ocount; | |
b812ce28 | 1629 | bool sync = (file->f_flags & O_DSYNC) || IS_SYNC(file->f_mapping->host); |
d0215f3e | 1630 | |
d0215f3e JB |
1631 | mutex_lock(&inode->i_mutex); |
1632 | ||
1633 | err = generic_segment_checks(iov, &nr_segs, &ocount, VERIFY_READ); | |
1634 | if (err) { | |
1635 | mutex_unlock(&inode->i_mutex); | |
1636 | goto out; | |
1637 | } | |
1638 | count = ocount; | |
1639 | ||
1640 | current->backing_dev_info = inode->i_mapping->backing_dev_info; | |
1641 | err = generic_write_checks(file, &pos, &count, S_ISBLK(inode->i_mode)); | |
1642 | if (err) { | |
1643 | mutex_unlock(&inode->i_mutex); | |
1644 | goto out; | |
1645 | } | |
1646 | ||
1647 | if (count == 0) { | |
1648 | mutex_unlock(&inode->i_mutex); | |
1649 | goto out; | |
1650 | } | |
1651 | ||
1652 | err = file_remove_suid(file); | |
1653 | if (err) { | |
1654 | mutex_unlock(&inode->i_mutex); | |
1655 | goto out; | |
1656 | } | |
1657 | ||
1658 | /* | |
1659 | * If BTRFS flips readonly due to some impossible error | |
1660 | * (fs_info->fs_state now has BTRFS_SUPER_FLAG_ERROR), | |
1661 | * although we have opened a file as writable, we have | |
1662 | * to stop this write operation to ensure FS consistency. | |
1663 | */ | |
87533c47 | 1664 | if (test_bit(BTRFS_FS_STATE_ERROR, &root->fs_info->fs_state)) { |
d0215f3e JB |
1665 | mutex_unlock(&inode->i_mutex); |
1666 | err = -EROFS; | |
1667 | goto out; | |
1668 | } | |
1669 | ||
6c760c07 JB |
1670 | /* |
1671 | * We reserve space for updating the inode when we reserve space for the | |
1672 | * extent we are going to write, so we will enospc out there. We don't | |
1673 | * need to start yet another transaction to update the inode as we will | |
1674 | * update the inode when we finish writing whatever data we write. | |
1675 | */ | |
1676 | update_time_for_write(inode); | |
d0215f3e | 1677 | |
0c1a98c8 MX |
1678 | start_pos = round_down(pos, root->sectorsize); |
1679 | if (start_pos > i_size_read(inode)) { | |
1680 | err = btrfs_cont_expand(inode, i_size_read(inode), start_pos); | |
1681 | if (err) { | |
1682 | mutex_unlock(&inode->i_mutex); | |
1683 | goto out; | |
1684 | } | |
1685 | } | |
1686 | ||
b812ce28 JB |
1687 | if (sync) |
1688 | atomic_inc(&BTRFS_I(inode)->sync_writers); | |
1689 | ||
d0215f3e JB |
1690 | if (unlikely(file->f_flags & O_DIRECT)) { |
1691 | num_written = __btrfs_direct_write(iocb, iov, nr_segs, | |
1692 | pos, ppos, count, ocount); | |
1693 | } else { | |
1694 | struct iov_iter i; | |
1695 | ||
1696 | iov_iter_init(&i, iov, nr_segs, count, num_written); | |
1697 | ||
1698 | num_written = __btrfs_buffered_write(file, &i, pos); | |
1699 | if (num_written > 0) | |
1700 | *ppos = pos + num_written; | |
1701 | } | |
1702 | ||
1703 | mutex_unlock(&inode->i_mutex); | |
2ff3e9b6 | 1704 | |
5a3f23d5 CM |
1705 | /* |
1706 | * we want to make sure fsync finds this change | |
1707 | * but we haven't joined a transaction running right now. | |
1708 | * | |
1709 | * Later on, someone is sure to update the inode and get the | |
1710 | * real transid recorded. | |
1711 | * | |
1712 | * We set last_trans now to the fs_info generation + 1, | |
1713 | * this will either be one more than the running transaction | |
1714 | * or the generation used for the next transaction if there isn't | |
1715 | * one running right now. | |
6c760c07 JB |
1716 | * |
1717 | * We also have to set last_sub_trans to the current log transid, | |
1718 | * otherwise subsequent syncs to a file that's been synced in this | |
1719 | * transaction will appear to have already occured. | |
5a3f23d5 CM |
1720 | */ |
1721 | BTRFS_I(inode)->last_trans = root->fs_info->generation + 1; | |
6c760c07 | 1722 | BTRFS_I(inode)->last_sub_trans = root->log_transid; |
02afc27f | 1723 | if (num_written > 0) { |
d0215f3e JB |
1724 | err = generic_write_sync(file, pos, num_written); |
1725 | if (err < 0 && num_written > 0) | |
2ff3e9b6 CM |
1726 | num_written = err; |
1727 | } | |
0a3404dc | 1728 | |
b812ce28 JB |
1729 | if (sync) |
1730 | atomic_dec(&BTRFS_I(inode)->sync_writers); | |
0a3404dc | 1731 | out: |
39279cc3 | 1732 | current->backing_dev_info = NULL; |
39279cc3 CM |
1733 | return num_written ? num_written : err; |
1734 | } | |
1735 | ||
d397712b | 1736 | int btrfs_release_file(struct inode *inode, struct file *filp) |
e1b81e67 | 1737 | { |
5a3f23d5 CM |
1738 | /* |
1739 | * ordered_data_close is set by settattr when we are about to truncate | |
1740 | * a file from a non-zero size to a zero size. This tries to | |
1741 | * flush down new bytes that may have been written if the | |
1742 | * application were using truncate to replace a file in place. | |
1743 | */ | |
72ac3c0d JB |
1744 | if (test_and_clear_bit(BTRFS_INODE_ORDERED_DATA_CLOSE, |
1745 | &BTRFS_I(inode)->runtime_flags)) { | |
569e0f35 JB |
1746 | struct btrfs_trans_handle *trans; |
1747 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
1748 | ||
1749 | /* | |
1750 | * We need to block on a committing transaction to keep us from | |
1751 | * throwing a ordered operation on to the list and causing | |
1752 | * something like sync to deadlock trying to flush out this | |
1753 | * inode. | |
1754 | */ | |
1755 | trans = btrfs_start_transaction(root, 0); | |
1756 | if (IS_ERR(trans)) | |
1757 | return PTR_ERR(trans); | |
1758 | btrfs_add_ordered_operation(trans, BTRFS_I(inode)->root, inode); | |
1759 | btrfs_end_transaction(trans, root); | |
5a3f23d5 CM |
1760 | if (inode->i_size > BTRFS_ORDERED_OPERATIONS_FLUSH_LIMIT) |
1761 | filemap_flush(inode->i_mapping); | |
1762 | } | |
6bf13c0c SW |
1763 | if (filp->private_data) |
1764 | btrfs_ioctl_trans_end(filp); | |
e1b81e67 M |
1765 | return 0; |
1766 | } | |
1767 | ||
d352ac68 CM |
1768 | /* |
1769 | * fsync call for both files and directories. This logs the inode into | |
1770 | * the tree log instead of forcing full commits whenever possible. | |
1771 | * | |
1772 | * It needs to call filemap_fdatawait so that all ordered extent updates are | |
1773 | * in the metadata btree are up to date for copying to the log. | |
1774 | * | |
1775 | * It drops the inode mutex before doing the tree log commit. This is an | |
1776 | * important optimization for directories because holding the mutex prevents | |
1777 | * new operations on the dir while we write to disk. | |
1778 | */ | |
02c24a82 | 1779 | int btrfs_sync_file(struct file *file, loff_t start, loff_t end, int datasync) |
39279cc3 | 1780 | { |
7ea80859 | 1781 | struct dentry *dentry = file->f_path.dentry; |
39279cc3 CM |
1782 | struct inode *inode = dentry->d_inode; |
1783 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
15ee9bc7 | 1784 | int ret = 0; |
39279cc3 | 1785 | struct btrfs_trans_handle *trans; |
2ab28f32 | 1786 | bool full_sync = 0; |
39279cc3 | 1787 | |
1abe9b8a | 1788 | trace_btrfs_sync_file(file, datasync); |
257c62e1 | 1789 | |
90abccf2 MX |
1790 | /* |
1791 | * We write the dirty pages in the range and wait until they complete | |
1792 | * out of the ->i_mutex. If so, we can flush the dirty pages by | |
2ab28f32 JB |
1793 | * multi-task, and make the performance up. See |
1794 | * btrfs_wait_ordered_range for an explanation of the ASYNC check. | |
90abccf2 | 1795 | */ |
b812ce28 | 1796 | atomic_inc(&BTRFS_I(inode)->sync_writers); |
2ab28f32 JB |
1797 | ret = filemap_fdatawrite_range(inode->i_mapping, start, end); |
1798 | if (!ret && test_bit(BTRFS_INODE_HAS_ASYNC_EXTENT, | |
1799 | &BTRFS_I(inode)->runtime_flags)) | |
1800 | ret = filemap_fdatawrite_range(inode->i_mapping, start, end); | |
b812ce28 | 1801 | atomic_dec(&BTRFS_I(inode)->sync_writers); |
90abccf2 MX |
1802 | if (ret) |
1803 | return ret; | |
1804 | ||
02c24a82 JB |
1805 | mutex_lock(&inode->i_mutex); |
1806 | ||
0885ef5b | 1807 | /* |
90abccf2 MX |
1808 | * We flush the dirty pages again to avoid some dirty pages in the |
1809 | * range being left. | |
0885ef5b | 1810 | */ |
2ecb7923 | 1811 | atomic_inc(&root->log_batch); |
2ab28f32 JB |
1812 | full_sync = test_bit(BTRFS_INODE_NEEDS_FULL_SYNC, |
1813 | &BTRFS_I(inode)->runtime_flags); | |
0ef8b726 JB |
1814 | if (full_sync) { |
1815 | ret = btrfs_wait_ordered_range(inode, start, end - start + 1); | |
1816 | if (ret) { | |
1817 | mutex_unlock(&inode->i_mutex); | |
1818 | goto out; | |
1819 | } | |
1820 | } | |
2ecb7923 | 1821 | atomic_inc(&root->log_batch); |
257c62e1 | 1822 | |
39279cc3 | 1823 | /* |
15ee9bc7 JB |
1824 | * check the transaction that last modified this inode |
1825 | * and see if its already been committed | |
39279cc3 | 1826 | */ |
02c24a82 JB |
1827 | if (!BTRFS_I(inode)->last_trans) { |
1828 | mutex_unlock(&inode->i_mutex); | |
15ee9bc7 | 1829 | goto out; |
02c24a82 | 1830 | } |
a2135011 | 1831 | |
257c62e1 CM |
1832 | /* |
1833 | * if the last transaction that changed this file was before | |
1834 | * the current transaction, we can bail out now without any | |
1835 | * syncing | |
1836 | */ | |
a4abeea4 | 1837 | smp_mb(); |
22ee6985 JB |
1838 | if (btrfs_inode_in_log(inode, root->fs_info->generation) || |
1839 | BTRFS_I(inode)->last_trans <= | |
15ee9bc7 JB |
1840 | root->fs_info->last_trans_committed) { |
1841 | BTRFS_I(inode)->last_trans = 0; | |
5dc562c5 JB |
1842 | |
1843 | /* | |
1844 | * We'v had everything committed since the last time we were | |
1845 | * modified so clear this flag in case it was set for whatever | |
1846 | * reason, it's no longer relevant. | |
1847 | */ | |
1848 | clear_bit(BTRFS_INODE_NEEDS_FULL_SYNC, | |
1849 | &BTRFS_I(inode)->runtime_flags); | |
02c24a82 | 1850 | mutex_unlock(&inode->i_mutex); |
15ee9bc7 JB |
1851 | goto out; |
1852 | } | |
15ee9bc7 JB |
1853 | |
1854 | /* | |
a52d9a80 CM |
1855 | * ok we haven't committed the transaction yet, lets do a commit |
1856 | */ | |
6f902af4 | 1857 | if (file->private_data) |
6bf13c0c SW |
1858 | btrfs_ioctl_trans_end(file); |
1859 | ||
a22285a6 YZ |
1860 | trans = btrfs_start_transaction(root, 0); |
1861 | if (IS_ERR(trans)) { | |
1862 | ret = PTR_ERR(trans); | |
02c24a82 | 1863 | mutex_unlock(&inode->i_mutex); |
39279cc3 CM |
1864 | goto out; |
1865 | } | |
e02119d5 | 1866 | |
2cfbd50b | 1867 | ret = btrfs_log_dentry_safe(trans, root, dentry); |
02c24a82 | 1868 | if (ret < 0) { |
a0634be5 FDBM |
1869 | /* Fallthrough and commit/free transaction. */ |
1870 | ret = 1; | |
02c24a82 | 1871 | } |
49eb7e46 CM |
1872 | |
1873 | /* we've logged all the items and now have a consistent | |
1874 | * version of the file in the log. It is possible that | |
1875 | * someone will come in and modify the file, but that's | |
1876 | * fine because the log is consistent on disk, and we | |
1877 | * have references to all of the file's extents | |
1878 | * | |
1879 | * It is possible that someone will come in and log the | |
1880 | * file again, but that will end up using the synchronization | |
1881 | * inside btrfs_sync_log to keep things safe. | |
1882 | */ | |
02c24a82 | 1883 | mutex_unlock(&inode->i_mutex); |
49eb7e46 | 1884 | |
257c62e1 | 1885 | if (ret != BTRFS_NO_LOG_SYNC) { |
0ef8b726 | 1886 | if (!ret) { |
257c62e1 | 1887 | ret = btrfs_sync_log(trans, root); |
0ef8b726 | 1888 | if (!ret) { |
257c62e1 | 1889 | ret = btrfs_end_transaction(trans, root); |
0ef8b726 | 1890 | goto out; |
2ab28f32 | 1891 | } |
257c62e1 | 1892 | } |
0ef8b726 JB |
1893 | if (!full_sync) { |
1894 | ret = btrfs_wait_ordered_range(inode, start, | |
1895 | end - start + 1); | |
1896 | if (ret) | |
1897 | goto out; | |
1898 | } | |
1899 | ret = btrfs_commit_transaction(trans, root); | |
257c62e1 CM |
1900 | } else { |
1901 | ret = btrfs_end_transaction(trans, root); | |
e02119d5 | 1902 | } |
39279cc3 | 1903 | out: |
014e4ac4 | 1904 | return ret > 0 ? -EIO : ret; |
39279cc3 CM |
1905 | } |
1906 | ||
f0f37e2f | 1907 | static const struct vm_operations_struct btrfs_file_vm_ops = { |
92fee66d | 1908 | .fault = filemap_fault, |
9ebefb18 | 1909 | .page_mkwrite = btrfs_page_mkwrite, |
0b173bc4 | 1910 | .remap_pages = generic_file_remap_pages, |
9ebefb18 CM |
1911 | }; |
1912 | ||
1913 | static int btrfs_file_mmap(struct file *filp, struct vm_area_struct *vma) | |
1914 | { | |
058a457e MX |
1915 | struct address_space *mapping = filp->f_mapping; |
1916 | ||
1917 | if (!mapping->a_ops->readpage) | |
1918 | return -ENOEXEC; | |
1919 | ||
9ebefb18 | 1920 | file_accessed(filp); |
058a457e | 1921 | vma->vm_ops = &btrfs_file_vm_ops; |
058a457e | 1922 | |
9ebefb18 CM |
1923 | return 0; |
1924 | } | |
1925 | ||
2aaa6655 JB |
1926 | static int hole_mergeable(struct inode *inode, struct extent_buffer *leaf, |
1927 | int slot, u64 start, u64 end) | |
1928 | { | |
1929 | struct btrfs_file_extent_item *fi; | |
1930 | struct btrfs_key key; | |
1931 | ||
1932 | if (slot < 0 || slot >= btrfs_header_nritems(leaf)) | |
1933 | return 0; | |
1934 | ||
1935 | btrfs_item_key_to_cpu(leaf, &key, slot); | |
1936 | if (key.objectid != btrfs_ino(inode) || | |
1937 | key.type != BTRFS_EXTENT_DATA_KEY) | |
1938 | return 0; | |
1939 | ||
1940 | fi = btrfs_item_ptr(leaf, slot, struct btrfs_file_extent_item); | |
1941 | ||
1942 | if (btrfs_file_extent_type(leaf, fi) != BTRFS_FILE_EXTENT_REG) | |
1943 | return 0; | |
1944 | ||
1945 | if (btrfs_file_extent_disk_bytenr(leaf, fi)) | |
1946 | return 0; | |
1947 | ||
1948 | if (key.offset == end) | |
1949 | return 1; | |
1950 | if (key.offset + btrfs_file_extent_num_bytes(leaf, fi) == start) | |
1951 | return 1; | |
1952 | return 0; | |
1953 | } | |
1954 | ||
1955 | static int fill_holes(struct btrfs_trans_handle *trans, struct inode *inode, | |
1956 | struct btrfs_path *path, u64 offset, u64 end) | |
1957 | { | |
1958 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
1959 | struct extent_buffer *leaf; | |
1960 | struct btrfs_file_extent_item *fi; | |
1961 | struct extent_map *hole_em; | |
1962 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; | |
1963 | struct btrfs_key key; | |
1964 | int ret; | |
1965 | ||
1966 | key.objectid = btrfs_ino(inode); | |
1967 | key.type = BTRFS_EXTENT_DATA_KEY; | |
1968 | key.offset = offset; | |
1969 | ||
1970 | ||
1971 | ret = btrfs_search_slot(trans, root, &key, path, 0, 1); | |
1972 | if (ret < 0) | |
1973 | return ret; | |
1974 | BUG_ON(!ret); | |
1975 | ||
1976 | leaf = path->nodes[0]; | |
1977 | if (hole_mergeable(inode, leaf, path->slots[0]-1, offset, end)) { | |
1978 | u64 num_bytes; | |
1979 | ||
1980 | path->slots[0]--; | |
1981 | fi = btrfs_item_ptr(leaf, path->slots[0], | |
1982 | struct btrfs_file_extent_item); | |
1983 | num_bytes = btrfs_file_extent_num_bytes(leaf, fi) + | |
1984 | end - offset; | |
1985 | btrfs_set_file_extent_num_bytes(leaf, fi, num_bytes); | |
1986 | btrfs_set_file_extent_ram_bytes(leaf, fi, num_bytes); | |
1987 | btrfs_set_file_extent_offset(leaf, fi, 0); | |
1988 | btrfs_mark_buffer_dirty(leaf); | |
1989 | goto out; | |
1990 | } | |
1991 | ||
1992 | if (hole_mergeable(inode, leaf, path->slots[0]+1, offset, end)) { | |
1993 | u64 num_bytes; | |
1994 | ||
1995 | path->slots[0]++; | |
1996 | key.offset = offset; | |
afe5fea7 | 1997 | btrfs_set_item_key_safe(root, path, &key); |
2aaa6655 JB |
1998 | fi = btrfs_item_ptr(leaf, path->slots[0], |
1999 | struct btrfs_file_extent_item); | |
2000 | num_bytes = btrfs_file_extent_num_bytes(leaf, fi) + end - | |
2001 | offset; | |
2002 | btrfs_set_file_extent_num_bytes(leaf, fi, num_bytes); | |
2003 | btrfs_set_file_extent_ram_bytes(leaf, fi, num_bytes); | |
2004 | btrfs_set_file_extent_offset(leaf, fi, 0); | |
2005 | btrfs_mark_buffer_dirty(leaf); | |
2006 | goto out; | |
2007 | } | |
2008 | btrfs_release_path(path); | |
2009 | ||
2010 | ret = btrfs_insert_file_extent(trans, root, btrfs_ino(inode), offset, | |
2011 | 0, 0, end - offset, 0, end - offset, | |
2012 | 0, 0, 0); | |
2013 | if (ret) | |
2014 | return ret; | |
2015 | ||
2016 | out: | |
2017 | btrfs_release_path(path); | |
2018 | ||
2019 | hole_em = alloc_extent_map(); | |
2020 | if (!hole_em) { | |
2021 | btrfs_drop_extent_cache(inode, offset, end - 1, 0); | |
2022 | set_bit(BTRFS_INODE_NEEDS_FULL_SYNC, | |
2023 | &BTRFS_I(inode)->runtime_flags); | |
2024 | } else { | |
2025 | hole_em->start = offset; | |
2026 | hole_em->len = end - offset; | |
cc95bef6 | 2027 | hole_em->ram_bytes = hole_em->len; |
2aaa6655 JB |
2028 | hole_em->orig_start = offset; |
2029 | ||
2030 | hole_em->block_start = EXTENT_MAP_HOLE; | |
2031 | hole_em->block_len = 0; | |
b4939680 | 2032 | hole_em->orig_block_len = 0; |
2aaa6655 JB |
2033 | hole_em->bdev = root->fs_info->fs_devices->latest_bdev; |
2034 | hole_em->compress_type = BTRFS_COMPRESS_NONE; | |
2035 | hole_em->generation = trans->transid; | |
2036 | ||
2037 | do { | |
2038 | btrfs_drop_extent_cache(inode, offset, end - 1, 0); | |
2039 | write_lock(&em_tree->lock); | |
09a2a8f9 | 2040 | ret = add_extent_mapping(em_tree, hole_em, 1); |
2aaa6655 JB |
2041 | write_unlock(&em_tree->lock); |
2042 | } while (ret == -EEXIST); | |
2043 | free_extent_map(hole_em); | |
2044 | if (ret) | |
2045 | set_bit(BTRFS_INODE_NEEDS_FULL_SYNC, | |
2046 | &BTRFS_I(inode)->runtime_flags); | |
2047 | } | |
2048 | ||
2049 | return 0; | |
2050 | } | |
2051 | ||
2052 | static int btrfs_punch_hole(struct inode *inode, loff_t offset, loff_t len) | |
2053 | { | |
2054 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
2055 | struct extent_state *cached_state = NULL; | |
2056 | struct btrfs_path *path; | |
2057 | struct btrfs_block_rsv *rsv; | |
2058 | struct btrfs_trans_handle *trans; | |
0061280d MX |
2059 | u64 lockstart = round_up(offset, BTRFS_I(inode)->root->sectorsize); |
2060 | u64 lockend = round_down(offset + len, | |
2061 | BTRFS_I(inode)->root->sectorsize) - 1; | |
2aaa6655 JB |
2062 | u64 cur_offset = lockstart; |
2063 | u64 min_size = btrfs_calc_trunc_metadata_size(root, 1); | |
2064 | u64 drop_end; | |
2aaa6655 JB |
2065 | int ret = 0; |
2066 | int err = 0; | |
6347b3c4 MX |
2067 | bool same_page = ((offset >> PAGE_CACHE_SHIFT) == |
2068 | ((offset + len - 1) >> PAGE_CACHE_SHIFT)); | |
2aaa6655 | 2069 | |
0ef8b726 JB |
2070 | ret = btrfs_wait_ordered_range(inode, offset, len); |
2071 | if (ret) | |
2072 | return ret; | |
2aaa6655 JB |
2073 | |
2074 | mutex_lock(&inode->i_mutex); | |
7426cc04 MX |
2075 | /* |
2076 | * We needn't truncate any page which is beyond the end of the file | |
2077 | * because we are sure there is no data there. | |
2078 | */ | |
2aaa6655 JB |
2079 | /* |
2080 | * Only do this if we are in the same page and we aren't doing the | |
2081 | * entire page. | |
2082 | */ | |
2083 | if (same_page && len < PAGE_CACHE_SIZE) { | |
7426cc04 MX |
2084 | if (offset < round_up(inode->i_size, PAGE_CACHE_SIZE)) |
2085 | ret = btrfs_truncate_page(inode, offset, len, 0); | |
2aaa6655 JB |
2086 | mutex_unlock(&inode->i_mutex); |
2087 | return ret; | |
2088 | } | |
2089 | ||
2090 | /* zero back part of the first page */ | |
7426cc04 MX |
2091 | if (offset < round_up(inode->i_size, PAGE_CACHE_SIZE)) { |
2092 | ret = btrfs_truncate_page(inode, offset, 0, 0); | |
2093 | if (ret) { | |
2094 | mutex_unlock(&inode->i_mutex); | |
2095 | return ret; | |
2096 | } | |
2aaa6655 JB |
2097 | } |
2098 | ||
2099 | /* zero the front end of the last page */ | |
0061280d MX |
2100 | if (offset + len < round_up(inode->i_size, PAGE_CACHE_SIZE)) { |
2101 | ret = btrfs_truncate_page(inode, offset + len, 0, 1); | |
2102 | if (ret) { | |
2103 | mutex_unlock(&inode->i_mutex); | |
2104 | return ret; | |
2105 | } | |
2aaa6655 JB |
2106 | } |
2107 | ||
2108 | if (lockend < lockstart) { | |
2109 | mutex_unlock(&inode->i_mutex); | |
2110 | return 0; | |
2111 | } | |
2112 | ||
2113 | while (1) { | |
2114 | struct btrfs_ordered_extent *ordered; | |
2115 | ||
2116 | truncate_pagecache_range(inode, lockstart, lockend); | |
2117 | ||
2118 | lock_extent_bits(&BTRFS_I(inode)->io_tree, lockstart, lockend, | |
2119 | 0, &cached_state); | |
2120 | ordered = btrfs_lookup_first_ordered_extent(inode, lockend); | |
2121 | ||
2122 | /* | |
2123 | * We need to make sure we have no ordered extents in this range | |
2124 | * and nobody raced in and read a page in this range, if we did | |
2125 | * we need to try again. | |
2126 | */ | |
2127 | if ((!ordered || | |
2128 | (ordered->file_offset + ordered->len < lockstart || | |
2129 | ordered->file_offset > lockend)) && | |
2130 | !test_range_bit(&BTRFS_I(inode)->io_tree, lockstart, | |
2131 | lockend, EXTENT_UPTODATE, 0, | |
2132 | cached_state)) { | |
2133 | if (ordered) | |
2134 | btrfs_put_ordered_extent(ordered); | |
2135 | break; | |
2136 | } | |
2137 | if (ordered) | |
2138 | btrfs_put_ordered_extent(ordered); | |
2139 | unlock_extent_cached(&BTRFS_I(inode)->io_tree, lockstart, | |
2140 | lockend, &cached_state, GFP_NOFS); | |
0ef8b726 JB |
2141 | ret = btrfs_wait_ordered_range(inode, lockstart, |
2142 | lockend - lockstart + 1); | |
2143 | if (ret) { | |
2144 | mutex_unlock(&inode->i_mutex); | |
2145 | return ret; | |
2146 | } | |
2aaa6655 JB |
2147 | } |
2148 | ||
2149 | path = btrfs_alloc_path(); | |
2150 | if (!path) { | |
2151 | ret = -ENOMEM; | |
2152 | goto out; | |
2153 | } | |
2154 | ||
66d8f3dd | 2155 | rsv = btrfs_alloc_block_rsv(root, BTRFS_BLOCK_RSV_TEMP); |
2aaa6655 JB |
2156 | if (!rsv) { |
2157 | ret = -ENOMEM; | |
2158 | goto out_free; | |
2159 | } | |
2160 | rsv->size = btrfs_calc_trunc_metadata_size(root, 1); | |
2161 | rsv->failfast = 1; | |
2162 | ||
2163 | /* | |
2164 | * 1 - update the inode | |
2165 | * 1 - removing the extents in the range | |
2166 | * 1 - adding the hole extent | |
2167 | */ | |
2168 | trans = btrfs_start_transaction(root, 3); | |
2169 | if (IS_ERR(trans)) { | |
2170 | err = PTR_ERR(trans); | |
2171 | goto out_free; | |
2172 | } | |
2173 | ||
2174 | ret = btrfs_block_rsv_migrate(&root->fs_info->trans_block_rsv, rsv, | |
2175 | min_size); | |
2176 | BUG_ON(ret); | |
2177 | trans->block_rsv = rsv; | |
2178 | ||
2179 | while (cur_offset < lockend) { | |
2180 | ret = __btrfs_drop_extents(trans, root, inode, path, | |
2181 | cur_offset, lockend + 1, | |
2182 | &drop_end, 1); | |
2183 | if (ret != -ENOSPC) | |
2184 | break; | |
2185 | ||
2186 | trans->block_rsv = &root->fs_info->trans_block_rsv; | |
2187 | ||
2188 | ret = fill_holes(trans, inode, path, cur_offset, drop_end); | |
2189 | if (ret) { | |
2190 | err = ret; | |
2191 | break; | |
2192 | } | |
2193 | ||
2194 | cur_offset = drop_end; | |
2195 | ||
2196 | ret = btrfs_update_inode(trans, root, inode); | |
2197 | if (ret) { | |
2198 | err = ret; | |
2199 | break; | |
2200 | } | |
2201 | ||
2aaa6655 | 2202 | btrfs_end_transaction(trans, root); |
b53d3f5d | 2203 | btrfs_btree_balance_dirty(root); |
2aaa6655 JB |
2204 | |
2205 | trans = btrfs_start_transaction(root, 3); | |
2206 | if (IS_ERR(trans)) { | |
2207 | ret = PTR_ERR(trans); | |
2208 | trans = NULL; | |
2209 | break; | |
2210 | } | |
2211 | ||
2212 | ret = btrfs_block_rsv_migrate(&root->fs_info->trans_block_rsv, | |
2213 | rsv, min_size); | |
2214 | BUG_ON(ret); /* shouldn't happen */ | |
2215 | trans->block_rsv = rsv; | |
2216 | } | |
2217 | ||
2218 | if (ret) { | |
2219 | err = ret; | |
2220 | goto out_trans; | |
2221 | } | |
2222 | ||
2223 | trans->block_rsv = &root->fs_info->trans_block_rsv; | |
2224 | ret = fill_holes(trans, inode, path, cur_offset, drop_end); | |
2225 | if (ret) { | |
2226 | err = ret; | |
2227 | goto out_trans; | |
2228 | } | |
2229 | ||
2230 | out_trans: | |
2231 | if (!trans) | |
2232 | goto out_free; | |
2233 | ||
e1f5790e TI |
2234 | inode_inc_iversion(inode); |
2235 | inode->i_mtime = inode->i_ctime = CURRENT_TIME; | |
2236 | ||
2aaa6655 JB |
2237 | trans->block_rsv = &root->fs_info->trans_block_rsv; |
2238 | ret = btrfs_update_inode(trans, root, inode); | |
2aaa6655 | 2239 | btrfs_end_transaction(trans, root); |
b53d3f5d | 2240 | btrfs_btree_balance_dirty(root); |
2aaa6655 JB |
2241 | out_free: |
2242 | btrfs_free_path(path); | |
2243 | btrfs_free_block_rsv(root, rsv); | |
2244 | out: | |
2245 | unlock_extent_cached(&BTRFS_I(inode)->io_tree, lockstart, lockend, | |
2246 | &cached_state, GFP_NOFS); | |
2247 | mutex_unlock(&inode->i_mutex); | |
2248 | if (ret && !err) | |
2249 | err = ret; | |
2250 | return err; | |
2251 | } | |
2252 | ||
2fe17c10 CH |
2253 | static long btrfs_fallocate(struct file *file, int mode, |
2254 | loff_t offset, loff_t len) | |
2255 | { | |
496ad9aa | 2256 | struct inode *inode = file_inode(file); |
2fe17c10 | 2257 | struct extent_state *cached_state = NULL; |
6113077c | 2258 | struct btrfs_root *root = BTRFS_I(inode)->root; |
2fe17c10 CH |
2259 | u64 cur_offset; |
2260 | u64 last_byte; | |
2261 | u64 alloc_start; | |
2262 | u64 alloc_end; | |
2263 | u64 alloc_hint = 0; | |
2264 | u64 locked_end; | |
2fe17c10 | 2265 | struct extent_map *em; |
797f4277 | 2266 | int blocksize = BTRFS_I(inode)->root->sectorsize; |
2fe17c10 CH |
2267 | int ret; |
2268 | ||
797f4277 MX |
2269 | alloc_start = round_down(offset, blocksize); |
2270 | alloc_end = round_up(offset + len, blocksize); | |
2fe17c10 | 2271 | |
2aaa6655 JB |
2272 | /* Make sure we aren't being give some crap mode */ |
2273 | if (mode & ~(FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE)) | |
2fe17c10 CH |
2274 | return -EOPNOTSUPP; |
2275 | ||
2aaa6655 JB |
2276 | if (mode & FALLOC_FL_PUNCH_HOLE) |
2277 | return btrfs_punch_hole(inode, offset, len); | |
2278 | ||
d98456fc CM |
2279 | /* |
2280 | * Make sure we have enough space before we do the | |
2281 | * allocation. | |
2282 | */ | |
0ff6fabd | 2283 | ret = btrfs_check_data_free_space(inode, alloc_end - alloc_start); |
d98456fc CM |
2284 | if (ret) |
2285 | return ret; | |
6113077c WS |
2286 | if (root->fs_info->quota_enabled) { |
2287 | ret = btrfs_qgroup_reserve(root, alloc_end - alloc_start); | |
2288 | if (ret) | |
2289 | goto out_reserve_fail; | |
2290 | } | |
d98456fc | 2291 | |
2fe17c10 CH |
2292 | mutex_lock(&inode->i_mutex); |
2293 | ret = inode_newsize_ok(inode, alloc_end); | |
2294 | if (ret) | |
2295 | goto out; | |
2296 | ||
2297 | if (alloc_start > inode->i_size) { | |
a41ad394 JB |
2298 | ret = btrfs_cont_expand(inode, i_size_read(inode), |
2299 | alloc_start); | |
2fe17c10 CH |
2300 | if (ret) |
2301 | goto out; | |
a71754fc JB |
2302 | } else { |
2303 | /* | |
2304 | * If we are fallocating from the end of the file onward we | |
2305 | * need to zero out the end of the page if i_size lands in the | |
2306 | * middle of a page. | |
2307 | */ | |
2308 | ret = btrfs_truncate_page(inode, inode->i_size, 0, 0); | |
2309 | if (ret) | |
2310 | goto out; | |
2fe17c10 CH |
2311 | } |
2312 | ||
a71754fc JB |
2313 | /* |
2314 | * wait for ordered IO before we have any locks. We'll loop again | |
2315 | * below with the locks held. | |
2316 | */ | |
0ef8b726 JB |
2317 | ret = btrfs_wait_ordered_range(inode, alloc_start, |
2318 | alloc_end - alloc_start); | |
2319 | if (ret) | |
2320 | goto out; | |
a71754fc | 2321 | |
2fe17c10 CH |
2322 | locked_end = alloc_end - 1; |
2323 | while (1) { | |
2324 | struct btrfs_ordered_extent *ordered; | |
2325 | ||
2326 | /* the extent lock is ordered inside the running | |
2327 | * transaction | |
2328 | */ | |
2329 | lock_extent_bits(&BTRFS_I(inode)->io_tree, alloc_start, | |
d0082371 | 2330 | locked_end, 0, &cached_state); |
2fe17c10 CH |
2331 | ordered = btrfs_lookup_first_ordered_extent(inode, |
2332 | alloc_end - 1); | |
2333 | if (ordered && | |
2334 | ordered->file_offset + ordered->len > alloc_start && | |
2335 | ordered->file_offset < alloc_end) { | |
2336 | btrfs_put_ordered_extent(ordered); | |
2337 | unlock_extent_cached(&BTRFS_I(inode)->io_tree, | |
2338 | alloc_start, locked_end, | |
2339 | &cached_state, GFP_NOFS); | |
2340 | /* | |
2341 | * we can't wait on the range with the transaction | |
2342 | * running or with the extent lock held | |
2343 | */ | |
0ef8b726 JB |
2344 | ret = btrfs_wait_ordered_range(inode, alloc_start, |
2345 | alloc_end - alloc_start); | |
2346 | if (ret) | |
2347 | goto out; | |
2fe17c10 CH |
2348 | } else { |
2349 | if (ordered) | |
2350 | btrfs_put_ordered_extent(ordered); | |
2351 | break; | |
2352 | } | |
2353 | } | |
2354 | ||
2355 | cur_offset = alloc_start; | |
2356 | while (1) { | |
f1e490a7 JB |
2357 | u64 actual_end; |
2358 | ||
2fe17c10 CH |
2359 | em = btrfs_get_extent(inode, NULL, 0, cur_offset, |
2360 | alloc_end - cur_offset, 0); | |
79787eaa JM |
2361 | if (IS_ERR_OR_NULL(em)) { |
2362 | if (!em) | |
2363 | ret = -ENOMEM; | |
2364 | else | |
2365 | ret = PTR_ERR(em); | |
2366 | break; | |
2367 | } | |
2fe17c10 | 2368 | last_byte = min(extent_map_end(em), alloc_end); |
f1e490a7 | 2369 | actual_end = min_t(u64, extent_map_end(em), offset + len); |
797f4277 | 2370 | last_byte = ALIGN(last_byte, blocksize); |
f1e490a7 | 2371 | |
2fe17c10 CH |
2372 | if (em->block_start == EXTENT_MAP_HOLE || |
2373 | (cur_offset >= inode->i_size && | |
2374 | !test_bit(EXTENT_FLAG_PREALLOC, &em->flags))) { | |
2375 | ret = btrfs_prealloc_file_range(inode, mode, cur_offset, | |
2376 | last_byte - cur_offset, | |
2377 | 1 << inode->i_blkbits, | |
2378 | offset + len, | |
2379 | &alloc_hint); | |
1b9c332b | 2380 | |
2fe17c10 CH |
2381 | if (ret < 0) { |
2382 | free_extent_map(em); | |
2383 | break; | |
2384 | } | |
f1e490a7 JB |
2385 | } else if (actual_end > inode->i_size && |
2386 | !(mode & FALLOC_FL_KEEP_SIZE)) { | |
2387 | /* | |
2388 | * We didn't need to allocate any more space, but we | |
2389 | * still extended the size of the file so we need to | |
2390 | * update i_size. | |
2391 | */ | |
2392 | inode->i_ctime = CURRENT_TIME; | |
2393 | i_size_write(inode, actual_end); | |
2394 | btrfs_ordered_update_i_size(inode, actual_end, NULL); | |
2fe17c10 CH |
2395 | } |
2396 | free_extent_map(em); | |
2397 | ||
2398 | cur_offset = last_byte; | |
2399 | if (cur_offset >= alloc_end) { | |
2400 | ret = 0; | |
2401 | break; | |
2402 | } | |
2403 | } | |
2404 | unlock_extent_cached(&BTRFS_I(inode)->io_tree, alloc_start, locked_end, | |
2405 | &cached_state, GFP_NOFS); | |
2fe17c10 CH |
2406 | out: |
2407 | mutex_unlock(&inode->i_mutex); | |
6113077c WS |
2408 | if (root->fs_info->quota_enabled) |
2409 | btrfs_qgroup_free(root, alloc_end - alloc_start); | |
2410 | out_reserve_fail: | |
d98456fc | 2411 | /* Let go of our reservation. */ |
0ff6fabd | 2412 | btrfs_free_reserved_data_space(inode, alloc_end - alloc_start); |
2fe17c10 CH |
2413 | return ret; |
2414 | } | |
2415 | ||
965c8e59 | 2416 | static int find_desired_extent(struct inode *inode, loff_t *offset, int whence) |
b2675157 JB |
2417 | { |
2418 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
7f4ca37c | 2419 | struct extent_map *em = NULL; |
b2675157 JB |
2420 | struct extent_state *cached_state = NULL; |
2421 | u64 lockstart = *offset; | |
2422 | u64 lockend = i_size_read(inode); | |
2423 | u64 start = *offset; | |
b2675157 | 2424 | u64 len = i_size_read(inode); |
b2675157 JB |
2425 | int ret = 0; |
2426 | ||
2427 | lockend = max_t(u64, root->sectorsize, lockend); | |
2428 | if (lockend <= lockstart) | |
2429 | lockend = lockstart + root->sectorsize; | |
2430 | ||
1214b53f | 2431 | lockend--; |
b2675157 JB |
2432 | len = lockend - lockstart + 1; |
2433 | ||
2434 | len = max_t(u64, len, root->sectorsize); | |
2435 | if (inode->i_size == 0) | |
2436 | return -ENXIO; | |
2437 | ||
2438 | lock_extent_bits(&BTRFS_I(inode)->io_tree, lockstart, lockend, 0, | |
d0082371 | 2439 | &cached_state); |
b2675157 | 2440 | |
7f4ca37c | 2441 | while (start < inode->i_size) { |
b2675157 JB |
2442 | em = btrfs_get_extent_fiemap(inode, NULL, 0, start, len, 0); |
2443 | if (IS_ERR(em)) { | |
6af021d8 | 2444 | ret = PTR_ERR(em); |
7f4ca37c | 2445 | em = NULL; |
b2675157 JB |
2446 | break; |
2447 | } | |
2448 | ||
7f4ca37c JB |
2449 | if (whence == SEEK_HOLE && |
2450 | (em->block_start == EXTENT_MAP_HOLE || | |
2451 | test_bit(EXTENT_FLAG_PREALLOC, &em->flags))) | |
2452 | break; | |
2453 | else if (whence == SEEK_DATA && | |
2454 | (em->block_start != EXTENT_MAP_HOLE && | |
2455 | !test_bit(EXTENT_FLAG_PREALLOC, &em->flags))) | |
2456 | break; | |
b2675157 JB |
2457 | |
2458 | start = em->start + em->len; | |
b2675157 | 2459 | free_extent_map(em); |
7f4ca37c | 2460 | em = NULL; |
b2675157 JB |
2461 | cond_resched(); |
2462 | } | |
7f4ca37c JB |
2463 | free_extent_map(em); |
2464 | if (!ret) { | |
2465 | if (whence == SEEK_DATA && start >= inode->i_size) | |
2466 | ret = -ENXIO; | |
2467 | else | |
2468 | *offset = min_t(loff_t, start, inode->i_size); | |
2469 | } | |
b2675157 JB |
2470 | unlock_extent_cached(&BTRFS_I(inode)->io_tree, lockstart, lockend, |
2471 | &cached_state, GFP_NOFS); | |
2472 | return ret; | |
2473 | } | |
2474 | ||
965c8e59 | 2475 | static loff_t btrfs_file_llseek(struct file *file, loff_t offset, int whence) |
b2675157 JB |
2476 | { |
2477 | struct inode *inode = file->f_mapping->host; | |
2478 | int ret; | |
2479 | ||
2480 | mutex_lock(&inode->i_mutex); | |
965c8e59 | 2481 | switch (whence) { |
b2675157 JB |
2482 | case SEEK_END: |
2483 | case SEEK_CUR: | |
965c8e59 | 2484 | offset = generic_file_llseek(file, offset, whence); |
b2675157 JB |
2485 | goto out; |
2486 | case SEEK_DATA: | |
2487 | case SEEK_HOLE: | |
48802c8a JL |
2488 | if (offset >= i_size_read(inode)) { |
2489 | mutex_unlock(&inode->i_mutex); | |
2490 | return -ENXIO; | |
2491 | } | |
2492 | ||
965c8e59 | 2493 | ret = find_desired_extent(inode, &offset, whence); |
b2675157 JB |
2494 | if (ret) { |
2495 | mutex_unlock(&inode->i_mutex); | |
2496 | return ret; | |
2497 | } | |
2498 | } | |
2499 | ||
46a1c2c7 | 2500 | offset = vfs_setpos(file, offset, inode->i_sb->s_maxbytes); |
b2675157 JB |
2501 | out: |
2502 | mutex_unlock(&inode->i_mutex); | |
2503 | return offset; | |
2504 | } | |
2505 | ||
828c0950 | 2506 | const struct file_operations btrfs_file_operations = { |
b2675157 | 2507 | .llseek = btrfs_file_llseek, |
39279cc3 | 2508 | .read = do_sync_read, |
4a001071 | 2509 | .write = do_sync_write, |
9ebefb18 | 2510 | .aio_read = generic_file_aio_read, |
e9906a98 | 2511 | .splice_read = generic_file_splice_read, |
11c65dcc | 2512 | .aio_write = btrfs_file_aio_write, |
9ebefb18 | 2513 | .mmap = btrfs_file_mmap, |
39279cc3 | 2514 | .open = generic_file_open, |
e1b81e67 | 2515 | .release = btrfs_release_file, |
39279cc3 | 2516 | .fsync = btrfs_sync_file, |
2fe17c10 | 2517 | .fallocate = btrfs_fallocate, |
34287aa3 | 2518 | .unlocked_ioctl = btrfs_ioctl, |
39279cc3 | 2519 | #ifdef CONFIG_COMPAT |
34287aa3 | 2520 | .compat_ioctl = btrfs_ioctl, |
39279cc3 CM |
2521 | #endif |
2522 | }; | |
9247f317 MX |
2523 | |
2524 | void btrfs_auto_defrag_exit(void) | |
2525 | { | |
2526 | if (btrfs_inode_defrag_cachep) | |
2527 | kmem_cache_destroy(btrfs_inode_defrag_cachep); | |
2528 | } | |
2529 | ||
2530 | int btrfs_auto_defrag_init(void) | |
2531 | { | |
2532 | btrfs_inode_defrag_cachep = kmem_cache_create("btrfs_inode_defrag", | |
2533 | sizeof(struct inode_defrag), 0, | |
2534 | SLAB_RECLAIM_ACCOUNT | SLAB_MEM_SPREAD, | |
2535 | NULL); | |
2536 | if (!btrfs_inode_defrag_cachep) | |
2537 | return -ENOMEM; | |
2538 | ||
2539 | return 0; | |
2540 | } |