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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, | |
1acae57b FDBM |
695 | u64 *drop_end, int drop_cache, |
696 | int replace_extent, | |
697 | u32 extent_item_size, | |
698 | int *key_inserted) | |
39279cc3 | 699 | { |
5f39d397 | 700 | struct extent_buffer *leaf; |
920bbbfb | 701 | struct btrfs_file_extent_item *fi; |
00f5c795 | 702 | struct btrfs_key key; |
920bbbfb | 703 | struct btrfs_key new_key; |
33345d01 | 704 | u64 ino = btrfs_ino(inode); |
920bbbfb YZ |
705 | u64 search_start = start; |
706 | u64 disk_bytenr = 0; | |
707 | u64 num_bytes = 0; | |
708 | u64 extent_offset = 0; | |
709 | u64 extent_end = 0; | |
710 | int del_nr = 0; | |
711 | int del_slot = 0; | |
712 | int extent_type; | |
ccd467d6 | 713 | int recow; |
00f5c795 | 714 | int ret; |
dc7fdde3 | 715 | int modify_tree = -1; |
5dc562c5 | 716 | int update_refs = (root->ref_cows || root == root->fs_info->tree_root); |
c3308f84 | 717 | int found = 0; |
1acae57b | 718 | int leafs_visited = 0; |
39279cc3 | 719 | |
a1ed835e CM |
720 | if (drop_cache) |
721 | btrfs_drop_extent_cache(inode, start, end - 1, 0); | |
a52d9a80 | 722 | |
dc7fdde3 CM |
723 | if (start >= BTRFS_I(inode)->disk_i_size) |
724 | modify_tree = 0; | |
725 | ||
d397712b | 726 | while (1) { |
ccd467d6 | 727 | recow = 0; |
33345d01 | 728 | ret = btrfs_lookup_file_extent(trans, root, path, ino, |
dc7fdde3 | 729 | search_start, modify_tree); |
39279cc3 | 730 | if (ret < 0) |
920bbbfb YZ |
731 | break; |
732 | if (ret > 0 && path->slots[0] > 0 && search_start == start) { | |
733 | leaf = path->nodes[0]; | |
734 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0] - 1); | |
33345d01 | 735 | if (key.objectid == ino && |
920bbbfb YZ |
736 | key.type == BTRFS_EXTENT_DATA_KEY) |
737 | path->slots[0]--; | |
39279cc3 | 738 | } |
920bbbfb | 739 | ret = 0; |
1acae57b | 740 | leafs_visited++; |
8c2383c3 | 741 | next_slot: |
5f39d397 | 742 | leaf = path->nodes[0]; |
920bbbfb YZ |
743 | if (path->slots[0] >= btrfs_header_nritems(leaf)) { |
744 | BUG_ON(del_nr > 0); | |
745 | ret = btrfs_next_leaf(root, path); | |
746 | if (ret < 0) | |
747 | break; | |
748 | if (ret > 0) { | |
749 | ret = 0; | |
750 | break; | |
8c2383c3 | 751 | } |
1acae57b | 752 | leafs_visited++; |
920bbbfb YZ |
753 | leaf = path->nodes[0]; |
754 | recow = 1; | |
755 | } | |
756 | ||
757 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); | |
33345d01 | 758 | if (key.objectid > ino || |
920bbbfb YZ |
759 | key.type > BTRFS_EXTENT_DATA_KEY || key.offset >= end) |
760 | break; | |
761 | ||
762 | fi = btrfs_item_ptr(leaf, path->slots[0], | |
763 | struct btrfs_file_extent_item); | |
764 | extent_type = btrfs_file_extent_type(leaf, fi); | |
765 | ||
766 | if (extent_type == BTRFS_FILE_EXTENT_REG || | |
767 | extent_type == BTRFS_FILE_EXTENT_PREALLOC) { | |
768 | disk_bytenr = btrfs_file_extent_disk_bytenr(leaf, fi); | |
769 | num_bytes = btrfs_file_extent_disk_num_bytes(leaf, fi); | |
770 | extent_offset = btrfs_file_extent_offset(leaf, fi); | |
771 | extent_end = key.offset + | |
772 | btrfs_file_extent_num_bytes(leaf, fi); | |
773 | } else if (extent_type == BTRFS_FILE_EXTENT_INLINE) { | |
774 | extent_end = key.offset + | |
514ac8ad CM |
775 | btrfs_file_extent_inline_len(leaf, |
776 | path->slots[0], fi); | |
8c2383c3 | 777 | } else { |
920bbbfb | 778 | WARN_ON(1); |
8c2383c3 | 779 | extent_end = search_start; |
39279cc3 CM |
780 | } |
781 | ||
920bbbfb YZ |
782 | if (extent_end <= search_start) { |
783 | path->slots[0]++; | |
8c2383c3 | 784 | goto next_slot; |
39279cc3 CM |
785 | } |
786 | ||
c3308f84 | 787 | found = 1; |
920bbbfb | 788 | search_start = max(key.offset, start); |
dc7fdde3 CM |
789 | if (recow || !modify_tree) { |
790 | modify_tree = -1; | |
b3b4aa74 | 791 | btrfs_release_path(path); |
920bbbfb | 792 | continue; |
39279cc3 | 793 | } |
6643558d | 794 | |
920bbbfb YZ |
795 | /* |
796 | * | - range to drop - | | |
797 | * | -------- extent -------- | | |
798 | */ | |
799 | if (start > key.offset && end < extent_end) { | |
800 | BUG_ON(del_nr > 0); | |
801 | BUG_ON(extent_type == BTRFS_FILE_EXTENT_INLINE); | |
802 | ||
803 | memcpy(&new_key, &key, sizeof(new_key)); | |
804 | new_key.offset = start; | |
805 | ret = btrfs_duplicate_item(trans, root, path, | |
806 | &new_key); | |
807 | if (ret == -EAGAIN) { | |
b3b4aa74 | 808 | btrfs_release_path(path); |
920bbbfb | 809 | continue; |
6643558d | 810 | } |
920bbbfb YZ |
811 | if (ret < 0) |
812 | break; | |
813 | ||
814 | leaf = path->nodes[0]; | |
815 | fi = btrfs_item_ptr(leaf, path->slots[0] - 1, | |
816 | struct btrfs_file_extent_item); | |
817 | btrfs_set_file_extent_num_bytes(leaf, fi, | |
818 | start - key.offset); | |
819 | ||
820 | fi = btrfs_item_ptr(leaf, path->slots[0], | |
821 | struct btrfs_file_extent_item); | |
822 | ||
823 | extent_offset += start - key.offset; | |
824 | btrfs_set_file_extent_offset(leaf, fi, extent_offset); | |
825 | btrfs_set_file_extent_num_bytes(leaf, fi, | |
826 | extent_end - start); | |
827 | btrfs_mark_buffer_dirty(leaf); | |
828 | ||
5dc562c5 | 829 | if (update_refs && disk_bytenr > 0) { |
771ed689 | 830 | ret = btrfs_inc_extent_ref(trans, root, |
920bbbfb YZ |
831 | disk_bytenr, num_bytes, 0, |
832 | root->root_key.objectid, | |
833 | new_key.objectid, | |
66d7e7f0 | 834 | start - extent_offset, 0); |
79787eaa | 835 | BUG_ON(ret); /* -ENOMEM */ |
771ed689 | 836 | } |
920bbbfb | 837 | key.offset = start; |
6643558d | 838 | } |
920bbbfb YZ |
839 | /* |
840 | * | ---- range to drop ----- | | |
841 | * | -------- extent -------- | | |
842 | */ | |
843 | if (start <= key.offset && end < extent_end) { | |
844 | BUG_ON(extent_type == BTRFS_FILE_EXTENT_INLINE); | |
6643558d | 845 | |
920bbbfb YZ |
846 | memcpy(&new_key, &key, sizeof(new_key)); |
847 | new_key.offset = end; | |
afe5fea7 | 848 | btrfs_set_item_key_safe(root, path, &new_key); |
6643558d | 849 | |
920bbbfb YZ |
850 | extent_offset += end - key.offset; |
851 | btrfs_set_file_extent_offset(leaf, fi, extent_offset); | |
852 | btrfs_set_file_extent_num_bytes(leaf, fi, | |
853 | extent_end - end); | |
854 | btrfs_mark_buffer_dirty(leaf); | |
2671485d | 855 | if (update_refs && disk_bytenr > 0) |
920bbbfb | 856 | inode_sub_bytes(inode, end - key.offset); |
920bbbfb | 857 | break; |
39279cc3 | 858 | } |
771ed689 | 859 | |
920bbbfb YZ |
860 | search_start = extent_end; |
861 | /* | |
862 | * | ---- range to drop ----- | | |
863 | * | -------- extent -------- | | |
864 | */ | |
865 | if (start > key.offset && end >= extent_end) { | |
866 | BUG_ON(del_nr > 0); | |
867 | BUG_ON(extent_type == BTRFS_FILE_EXTENT_INLINE); | |
8c2383c3 | 868 | |
920bbbfb YZ |
869 | btrfs_set_file_extent_num_bytes(leaf, fi, |
870 | start - key.offset); | |
871 | btrfs_mark_buffer_dirty(leaf); | |
2671485d | 872 | if (update_refs && disk_bytenr > 0) |
920bbbfb | 873 | inode_sub_bytes(inode, extent_end - start); |
920bbbfb YZ |
874 | if (end == extent_end) |
875 | break; | |
c8b97818 | 876 | |
920bbbfb YZ |
877 | path->slots[0]++; |
878 | goto next_slot; | |
31840ae1 ZY |
879 | } |
880 | ||
920bbbfb YZ |
881 | /* |
882 | * | ---- range to drop ----- | | |
883 | * | ------ extent ------ | | |
884 | */ | |
885 | if (start <= key.offset && end >= extent_end) { | |
886 | if (del_nr == 0) { | |
887 | del_slot = path->slots[0]; | |
888 | del_nr = 1; | |
889 | } else { | |
890 | BUG_ON(del_slot + del_nr != path->slots[0]); | |
891 | del_nr++; | |
892 | } | |
31840ae1 | 893 | |
5dc562c5 JB |
894 | if (update_refs && |
895 | extent_type == BTRFS_FILE_EXTENT_INLINE) { | |
a76a3cd4 | 896 | inode_sub_bytes(inode, |
920bbbfb YZ |
897 | extent_end - key.offset); |
898 | extent_end = ALIGN(extent_end, | |
899 | root->sectorsize); | |
5dc562c5 | 900 | } else if (update_refs && disk_bytenr > 0) { |
31840ae1 | 901 | ret = btrfs_free_extent(trans, root, |
920bbbfb YZ |
902 | disk_bytenr, num_bytes, 0, |
903 | root->root_key.objectid, | |
5d4f98a2 | 904 | key.objectid, key.offset - |
66d7e7f0 | 905 | extent_offset, 0); |
79787eaa | 906 | BUG_ON(ret); /* -ENOMEM */ |
920bbbfb YZ |
907 | inode_sub_bytes(inode, |
908 | extent_end - key.offset); | |
31840ae1 | 909 | } |
31840ae1 | 910 | |
920bbbfb YZ |
911 | if (end == extent_end) |
912 | break; | |
913 | ||
914 | if (path->slots[0] + 1 < btrfs_header_nritems(leaf)) { | |
915 | path->slots[0]++; | |
916 | goto next_slot; | |
917 | } | |
918 | ||
919 | ret = btrfs_del_items(trans, root, path, del_slot, | |
920 | del_nr); | |
79787eaa JM |
921 | if (ret) { |
922 | btrfs_abort_transaction(trans, root, ret); | |
5dc562c5 | 923 | break; |
79787eaa | 924 | } |
920bbbfb YZ |
925 | |
926 | del_nr = 0; | |
927 | del_slot = 0; | |
928 | ||
b3b4aa74 | 929 | btrfs_release_path(path); |
920bbbfb | 930 | continue; |
39279cc3 | 931 | } |
920bbbfb YZ |
932 | |
933 | BUG_ON(1); | |
39279cc3 | 934 | } |
920bbbfb | 935 | |
79787eaa | 936 | if (!ret && del_nr > 0) { |
1acae57b FDBM |
937 | /* |
938 | * Set path->slots[0] to first slot, so that after the delete | |
939 | * if items are move off from our leaf to its immediate left or | |
940 | * right neighbor leafs, we end up with a correct and adjusted | |
941 | * path->slots[0] for our insertion. | |
942 | */ | |
943 | path->slots[0] = del_slot; | |
920bbbfb | 944 | ret = btrfs_del_items(trans, root, path, del_slot, del_nr); |
79787eaa JM |
945 | if (ret) |
946 | btrfs_abort_transaction(trans, root, ret); | |
1acae57b FDBM |
947 | |
948 | leaf = path->nodes[0]; | |
949 | /* | |
950 | * leaf eb has flag EXTENT_BUFFER_STALE if it was deleted (that | |
951 | * is, its contents got pushed to its neighbors), in which case | |
952 | * it means path->locks[0] == 0 | |
953 | */ | |
954 | if (!ret && replace_extent && leafs_visited == 1 && | |
955 | path->locks[0] && | |
956 | btrfs_leaf_free_space(root, leaf) >= | |
957 | sizeof(struct btrfs_item) + extent_item_size) { | |
958 | ||
959 | key.objectid = ino; | |
960 | key.type = BTRFS_EXTENT_DATA_KEY; | |
961 | key.offset = start; | |
962 | setup_items_for_insert(root, path, &key, | |
963 | &extent_item_size, | |
964 | extent_item_size, | |
965 | sizeof(struct btrfs_item) + | |
966 | extent_item_size, 1); | |
967 | *key_inserted = 1; | |
968 | } | |
6643558d | 969 | } |
920bbbfb | 970 | |
1acae57b FDBM |
971 | if (!replace_extent || !(*key_inserted)) |
972 | btrfs_release_path(path); | |
2aaa6655 | 973 | if (drop_end) |
c3308f84 | 974 | *drop_end = found ? min(end, extent_end) : end; |
5dc562c5 JB |
975 | return ret; |
976 | } | |
977 | ||
978 | int btrfs_drop_extents(struct btrfs_trans_handle *trans, | |
979 | struct btrfs_root *root, struct inode *inode, u64 start, | |
2671485d | 980 | u64 end, int drop_cache) |
5dc562c5 JB |
981 | { |
982 | struct btrfs_path *path; | |
983 | int ret; | |
984 | ||
985 | path = btrfs_alloc_path(); | |
986 | if (!path) | |
987 | return -ENOMEM; | |
2aaa6655 | 988 | ret = __btrfs_drop_extents(trans, root, inode, path, start, end, NULL, |
1acae57b | 989 | drop_cache, 0, 0, NULL); |
920bbbfb | 990 | btrfs_free_path(path); |
39279cc3 CM |
991 | return ret; |
992 | } | |
993 | ||
d899e052 | 994 | static int extent_mergeable(struct extent_buffer *leaf, int slot, |
6c7d54ac YZ |
995 | u64 objectid, u64 bytenr, u64 orig_offset, |
996 | u64 *start, u64 *end) | |
d899e052 YZ |
997 | { |
998 | struct btrfs_file_extent_item *fi; | |
999 | struct btrfs_key key; | |
1000 | u64 extent_end; | |
1001 | ||
1002 | if (slot < 0 || slot >= btrfs_header_nritems(leaf)) | |
1003 | return 0; | |
1004 | ||
1005 | btrfs_item_key_to_cpu(leaf, &key, slot); | |
1006 | if (key.objectid != objectid || key.type != BTRFS_EXTENT_DATA_KEY) | |
1007 | return 0; | |
1008 | ||
1009 | fi = btrfs_item_ptr(leaf, slot, struct btrfs_file_extent_item); | |
1010 | if (btrfs_file_extent_type(leaf, fi) != BTRFS_FILE_EXTENT_REG || | |
1011 | btrfs_file_extent_disk_bytenr(leaf, fi) != bytenr || | |
6c7d54ac | 1012 | btrfs_file_extent_offset(leaf, fi) != key.offset - orig_offset || |
d899e052 YZ |
1013 | btrfs_file_extent_compression(leaf, fi) || |
1014 | btrfs_file_extent_encryption(leaf, fi) || | |
1015 | btrfs_file_extent_other_encoding(leaf, fi)) | |
1016 | return 0; | |
1017 | ||
1018 | extent_end = key.offset + btrfs_file_extent_num_bytes(leaf, fi); | |
1019 | if ((*start && *start != key.offset) || (*end && *end != extent_end)) | |
1020 | return 0; | |
1021 | ||
1022 | *start = key.offset; | |
1023 | *end = extent_end; | |
1024 | return 1; | |
1025 | } | |
1026 | ||
1027 | /* | |
1028 | * Mark extent in the range start - end as written. | |
1029 | * | |
1030 | * This changes extent type from 'pre-allocated' to 'regular'. If only | |
1031 | * part of extent is marked as written, the extent will be split into | |
1032 | * two or three. | |
1033 | */ | |
1034 | int btrfs_mark_extent_written(struct btrfs_trans_handle *trans, | |
d899e052 YZ |
1035 | struct inode *inode, u64 start, u64 end) |
1036 | { | |
920bbbfb | 1037 | struct btrfs_root *root = BTRFS_I(inode)->root; |
d899e052 YZ |
1038 | struct extent_buffer *leaf; |
1039 | struct btrfs_path *path; | |
1040 | struct btrfs_file_extent_item *fi; | |
1041 | struct btrfs_key key; | |
920bbbfb | 1042 | struct btrfs_key new_key; |
d899e052 YZ |
1043 | u64 bytenr; |
1044 | u64 num_bytes; | |
1045 | u64 extent_end; | |
5d4f98a2 | 1046 | u64 orig_offset; |
d899e052 YZ |
1047 | u64 other_start; |
1048 | u64 other_end; | |
920bbbfb YZ |
1049 | u64 split; |
1050 | int del_nr = 0; | |
1051 | int del_slot = 0; | |
6c7d54ac | 1052 | int recow; |
d899e052 | 1053 | int ret; |
33345d01 | 1054 | u64 ino = btrfs_ino(inode); |
d899e052 | 1055 | |
d899e052 | 1056 | path = btrfs_alloc_path(); |
d8926bb3 MF |
1057 | if (!path) |
1058 | return -ENOMEM; | |
d899e052 | 1059 | again: |
6c7d54ac | 1060 | recow = 0; |
920bbbfb | 1061 | split = start; |
33345d01 | 1062 | key.objectid = ino; |
d899e052 | 1063 | key.type = BTRFS_EXTENT_DATA_KEY; |
920bbbfb | 1064 | key.offset = split; |
d899e052 YZ |
1065 | |
1066 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); | |
41415730 JB |
1067 | if (ret < 0) |
1068 | goto out; | |
d899e052 YZ |
1069 | if (ret > 0 && path->slots[0] > 0) |
1070 | path->slots[0]--; | |
1071 | ||
1072 | leaf = path->nodes[0]; | |
1073 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); | |
33345d01 | 1074 | BUG_ON(key.objectid != ino || key.type != BTRFS_EXTENT_DATA_KEY); |
d899e052 YZ |
1075 | fi = btrfs_item_ptr(leaf, path->slots[0], |
1076 | struct btrfs_file_extent_item); | |
920bbbfb YZ |
1077 | BUG_ON(btrfs_file_extent_type(leaf, fi) != |
1078 | BTRFS_FILE_EXTENT_PREALLOC); | |
d899e052 YZ |
1079 | extent_end = key.offset + btrfs_file_extent_num_bytes(leaf, fi); |
1080 | BUG_ON(key.offset > start || extent_end < end); | |
1081 | ||
1082 | bytenr = btrfs_file_extent_disk_bytenr(leaf, fi); | |
1083 | num_bytes = btrfs_file_extent_disk_num_bytes(leaf, fi); | |
5d4f98a2 | 1084 | orig_offset = key.offset - btrfs_file_extent_offset(leaf, fi); |
6c7d54ac YZ |
1085 | memcpy(&new_key, &key, sizeof(new_key)); |
1086 | ||
1087 | if (start == key.offset && end < extent_end) { | |
1088 | other_start = 0; | |
1089 | other_end = start; | |
1090 | if (extent_mergeable(leaf, path->slots[0] - 1, | |
33345d01 | 1091 | ino, bytenr, orig_offset, |
6c7d54ac YZ |
1092 | &other_start, &other_end)) { |
1093 | new_key.offset = end; | |
afe5fea7 | 1094 | btrfs_set_item_key_safe(root, path, &new_key); |
6c7d54ac YZ |
1095 | fi = btrfs_item_ptr(leaf, path->slots[0], |
1096 | struct btrfs_file_extent_item); | |
224ecce5 JB |
1097 | btrfs_set_file_extent_generation(leaf, fi, |
1098 | trans->transid); | |
6c7d54ac YZ |
1099 | btrfs_set_file_extent_num_bytes(leaf, fi, |
1100 | extent_end - end); | |
1101 | btrfs_set_file_extent_offset(leaf, fi, | |
1102 | end - orig_offset); | |
1103 | fi = btrfs_item_ptr(leaf, path->slots[0] - 1, | |
1104 | struct btrfs_file_extent_item); | |
224ecce5 JB |
1105 | btrfs_set_file_extent_generation(leaf, fi, |
1106 | trans->transid); | |
6c7d54ac YZ |
1107 | btrfs_set_file_extent_num_bytes(leaf, fi, |
1108 | end - other_start); | |
1109 | btrfs_mark_buffer_dirty(leaf); | |
1110 | goto out; | |
1111 | } | |
1112 | } | |
1113 | ||
1114 | if (start > key.offset && end == extent_end) { | |
1115 | other_start = end; | |
1116 | other_end = 0; | |
1117 | if (extent_mergeable(leaf, path->slots[0] + 1, | |
33345d01 | 1118 | ino, bytenr, orig_offset, |
6c7d54ac YZ |
1119 | &other_start, &other_end)) { |
1120 | fi = btrfs_item_ptr(leaf, path->slots[0], | |
1121 | struct btrfs_file_extent_item); | |
1122 | btrfs_set_file_extent_num_bytes(leaf, fi, | |
1123 | start - key.offset); | |
224ecce5 JB |
1124 | btrfs_set_file_extent_generation(leaf, fi, |
1125 | trans->transid); | |
6c7d54ac YZ |
1126 | path->slots[0]++; |
1127 | new_key.offset = start; | |
afe5fea7 | 1128 | btrfs_set_item_key_safe(root, path, &new_key); |
6c7d54ac YZ |
1129 | |
1130 | fi = btrfs_item_ptr(leaf, path->slots[0], | |
1131 | struct btrfs_file_extent_item); | |
224ecce5 JB |
1132 | btrfs_set_file_extent_generation(leaf, fi, |
1133 | trans->transid); | |
6c7d54ac YZ |
1134 | btrfs_set_file_extent_num_bytes(leaf, fi, |
1135 | other_end - start); | |
1136 | btrfs_set_file_extent_offset(leaf, fi, | |
1137 | start - orig_offset); | |
1138 | btrfs_mark_buffer_dirty(leaf); | |
1139 | goto out; | |
1140 | } | |
1141 | } | |
d899e052 | 1142 | |
920bbbfb YZ |
1143 | while (start > key.offset || end < extent_end) { |
1144 | if (key.offset == start) | |
1145 | split = end; | |
1146 | ||
920bbbfb YZ |
1147 | new_key.offset = split; |
1148 | ret = btrfs_duplicate_item(trans, root, path, &new_key); | |
1149 | if (ret == -EAGAIN) { | |
b3b4aa74 | 1150 | btrfs_release_path(path); |
920bbbfb | 1151 | goto again; |
d899e052 | 1152 | } |
79787eaa JM |
1153 | if (ret < 0) { |
1154 | btrfs_abort_transaction(trans, root, ret); | |
1155 | goto out; | |
1156 | } | |
d899e052 | 1157 | |
920bbbfb YZ |
1158 | leaf = path->nodes[0]; |
1159 | fi = btrfs_item_ptr(leaf, path->slots[0] - 1, | |
d899e052 | 1160 | struct btrfs_file_extent_item); |
224ecce5 | 1161 | btrfs_set_file_extent_generation(leaf, fi, trans->transid); |
d899e052 | 1162 | btrfs_set_file_extent_num_bytes(leaf, fi, |
920bbbfb YZ |
1163 | split - key.offset); |
1164 | ||
1165 | fi = btrfs_item_ptr(leaf, path->slots[0], | |
1166 | struct btrfs_file_extent_item); | |
1167 | ||
224ecce5 | 1168 | btrfs_set_file_extent_generation(leaf, fi, trans->transid); |
920bbbfb YZ |
1169 | btrfs_set_file_extent_offset(leaf, fi, split - orig_offset); |
1170 | btrfs_set_file_extent_num_bytes(leaf, fi, | |
1171 | extent_end - split); | |
d899e052 YZ |
1172 | btrfs_mark_buffer_dirty(leaf); |
1173 | ||
920bbbfb YZ |
1174 | ret = btrfs_inc_extent_ref(trans, root, bytenr, num_bytes, 0, |
1175 | root->root_key.objectid, | |
66d7e7f0 | 1176 | ino, orig_offset, 0); |
79787eaa | 1177 | BUG_ON(ret); /* -ENOMEM */ |
d899e052 | 1178 | |
920bbbfb YZ |
1179 | if (split == start) { |
1180 | key.offset = start; | |
1181 | } else { | |
1182 | BUG_ON(start != key.offset); | |
d899e052 | 1183 | path->slots[0]--; |
920bbbfb | 1184 | extent_end = end; |
d899e052 | 1185 | } |
6c7d54ac | 1186 | recow = 1; |
d899e052 YZ |
1187 | } |
1188 | ||
920bbbfb YZ |
1189 | other_start = end; |
1190 | other_end = 0; | |
6c7d54ac | 1191 | if (extent_mergeable(leaf, path->slots[0] + 1, |
33345d01 | 1192 | ino, bytenr, orig_offset, |
6c7d54ac YZ |
1193 | &other_start, &other_end)) { |
1194 | if (recow) { | |
b3b4aa74 | 1195 | btrfs_release_path(path); |
6c7d54ac YZ |
1196 | goto again; |
1197 | } | |
920bbbfb YZ |
1198 | extent_end = other_end; |
1199 | del_slot = path->slots[0] + 1; | |
1200 | del_nr++; | |
1201 | ret = btrfs_free_extent(trans, root, bytenr, num_bytes, | |
1202 | 0, root->root_key.objectid, | |
66d7e7f0 | 1203 | ino, orig_offset, 0); |
79787eaa | 1204 | BUG_ON(ret); /* -ENOMEM */ |
d899e052 | 1205 | } |
920bbbfb YZ |
1206 | other_start = 0; |
1207 | other_end = start; | |
6c7d54ac | 1208 | if (extent_mergeable(leaf, path->slots[0] - 1, |
33345d01 | 1209 | ino, bytenr, orig_offset, |
6c7d54ac YZ |
1210 | &other_start, &other_end)) { |
1211 | if (recow) { | |
b3b4aa74 | 1212 | btrfs_release_path(path); |
6c7d54ac YZ |
1213 | goto again; |
1214 | } | |
920bbbfb YZ |
1215 | key.offset = other_start; |
1216 | del_slot = path->slots[0]; | |
1217 | del_nr++; | |
1218 | ret = btrfs_free_extent(trans, root, bytenr, num_bytes, | |
1219 | 0, root->root_key.objectid, | |
66d7e7f0 | 1220 | ino, orig_offset, 0); |
79787eaa | 1221 | BUG_ON(ret); /* -ENOMEM */ |
920bbbfb YZ |
1222 | } |
1223 | if (del_nr == 0) { | |
3f6fae95 SL |
1224 | fi = btrfs_item_ptr(leaf, path->slots[0], |
1225 | struct btrfs_file_extent_item); | |
920bbbfb YZ |
1226 | btrfs_set_file_extent_type(leaf, fi, |
1227 | BTRFS_FILE_EXTENT_REG); | |
224ecce5 | 1228 | btrfs_set_file_extent_generation(leaf, fi, trans->transid); |
920bbbfb | 1229 | btrfs_mark_buffer_dirty(leaf); |
6c7d54ac | 1230 | } else { |
3f6fae95 SL |
1231 | fi = btrfs_item_ptr(leaf, del_slot - 1, |
1232 | struct btrfs_file_extent_item); | |
6c7d54ac YZ |
1233 | btrfs_set_file_extent_type(leaf, fi, |
1234 | BTRFS_FILE_EXTENT_REG); | |
224ecce5 | 1235 | btrfs_set_file_extent_generation(leaf, fi, trans->transid); |
6c7d54ac YZ |
1236 | btrfs_set_file_extent_num_bytes(leaf, fi, |
1237 | extent_end - key.offset); | |
1238 | btrfs_mark_buffer_dirty(leaf); | |
920bbbfb | 1239 | |
6c7d54ac | 1240 | ret = btrfs_del_items(trans, root, path, del_slot, del_nr); |
79787eaa JM |
1241 | if (ret < 0) { |
1242 | btrfs_abort_transaction(trans, root, ret); | |
1243 | goto out; | |
1244 | } | |
6c7d54ac | 1245 | } |
920bbbfb | 1246 | out: |
d899e052 YZ |
1247 | btrfs_free_path(path); |
1248 | return 0; | |
1249 | } | |
1250 | ||
b1bf862e CM |
1251 | /* |
1252 | * on error we return an unlocked page and the error value | |
1253 | * on success we return a locked page and 0 | |
1254 | */ | |
b6316429 JB |
1255 | static int prepare_uptodate_page(struct page *page, u64 pos, |
1256 | bool force_uptodate) | |
b1bf862e CM |
1257 | { |
1258 | int ret = 0; | |
1259 | ||
b6316429 JB |
1260 | if (((pos & (PAGE_CACHE_SIZE - 1)) || force_uptodate) && |
1261 | !PageUptodate(page)) { | |
b1bf862e CM |
1262 | ret = btrfs_readpage(NULL, page); |
1263 | if (ret) | |
1264 | return ret; | |
1265 | lock_page(page); | |
1266 | if (!PageUptodate(page)) { | |
1267 | unlock_page(page); | |
1268 | return -EIO; | |
1269 | } | |
1270 | } | |
1271 | return 0; | |
1272 | } | |
1273 | ||
39279cc3 | 1274 | /* |
376cc685 | 1275 | * this just gets pages into the page cache and locks them down. |
39279cc3 | 1276 | */ |
b37392ea MX |
1277 | static noinline int prepare_pages(struct inode *inode, struct page **pages, |
1278 | size_t num_pages, loff_t pos, | |
1279 | size_t write_bytes, bool force_uptodate) | |
39279cc3 CM |
1280 | { |
1281 | int i; | |
1282 | unsigned long index = pos >> PAGE_CACHE_SHIFT; | |
3b16a4e3 | 1283 | gfp_t mask = btrfs_alloc_write_mask(inode->i_mapping); |
fc28b62d | 1284 | int err = 0; |
376cc685 | 1285 | int faili; |
8c2383c3 | 1286 | |
39279cc3 | 1287 | for (i = 0; i < num_pages; i++) { |
a94733d0 | 1288 | pages[i] = find_or_create_page(inode->i_mapping, index + i, |
e3a41a5b | 1289 | mask | __GFP_WRITE); |
39279cc3 | 1290 | if (!pages[i]) { |
b1bf862e CM |
1291 | faili = i - 1; |
1292 | err = -ENOMEM; | |
1293 | goto fail; | |
1294 | } | |
1295 | ||
1296 | if (i == 0) | |
b6316429 JB |
1297 | err = prepare_uptodate_page(pages[i], pos, |
1298 | force_uptodate); | |
b1bf862e CM |
1299 | if (i == num_pages - 1) |
1300 | err = prepare_uptodate_page(pages[i], | |
b6316429 | 1301 | pos + write_bytes, false); |
b1bf862e CM |
1302 | if (err) { |
1303 | page_cache_release(pages[i]); | |
1304 | faili = i - 1; | |
1305 | goto fail; | |
39279cc3 | 1306 | } |
ccd467d6 | 1307 | wait_on_page_writeback(pages[i]); |
39279cc3 | 1308 | } |
376cc685 MX |
1309 | |
1310 | return 0; | |
1311 | fail: | |
1312 | while (faili >= 0) { | |
1313 | unlock_page(pages[faili]); | |
1314 | page_cache_release(pages[faili]); | |
1315 | faili--; | |
1316 | } | |
1317 | return err; | |
1318 | ||
1319 | } | |
1320 | ||
1321 | /* | |
1322 | * This function locks the extent and properly waits for data=ordered extents | |
1323 | * to finish before allowing the pages to be modified if need. | |
1324 | * | |
1325 | * The return value: | |
1326 | * 1 - the extent is locked | |
1327 | * 0 - the extent is not locked, and everything is OK | |
1328 | * -EAGAIN - need re-prepare the pages | |
1329 | * the other < 0 number - Something wrong happens | |
1330 | */ | |
1331 | static noinline int | |
1332 | lock_and_cleanup_extent_if_need(struct inode *inode, struct page **pages, | |
1333 | size_t num_pages, loff_t pos, | |
1334 | u64 *lockstart, u64 *lockend, | |
1335 | struct extent_state **cached_state) | |
1336 | { | |
1337 | u64 start_pos; | |
1338 | u64 last_pos; | |
1339 | int i; | |
1340 | int ret = 0; | |
1341 | ||
1342 | start_pos = pos & ~((u64)PAGE_CACHE_SIZE - 1); | |
1343 | last_pos = start_pos + ((u64)num_pages << PAGE_CACHE_SHIFT) - 1; | |
1344 | ||
0762704b | 1345 | if (start_pos < inode->i_size) { |
e6dcd2dc | 1346 | struct btrfs_ordered_extent *ordered; |
2ac55d41 | 1347 | lock_extent_bits(&BTRFS_I(inode)->io_tree, |
376cc685 MX |
1348 | start_pos, last_pos, 0, cached_state); |
1349 | ordered = btrfs_lookup_first_ordered_extent(inode, last_pos); | |
e6dcd2dc CM |
1350 | if (ordered && |
1351 | ordered->file_offset + ordered->len > start_pos && | |
376cc685 | 1352 | ordered->file_offset <= last_pos) { |
e6dcd2dc | 1353 | btrfs_put_ordered_extent(ordered); |
2ac55d41 | 1354 | unlock_extent_cached(&BTRFS_I(inode)->io_tree, |
376cc685 MX |
1355 | start_pos, last_pos, |
1356 | cached_state, GFP_NOFS); | |
e6dcd2dc CM |
1357 | for (i = 0; i < num_pages; i++) { |
1358 | unlock_page(pages[i]); | |
1359 | page_cache_release(pages[i]); | |
1360 | } | |
376cc685 MX |
1361 | ret = btrfs_wait_ordered_range(inode, start_pos, |
1362 | last_pos - start_pos + 1); | |
1363 | if (ret) | |
1364 | return ret; | |
1365 | else | |
1366 | return -EAGAIN; | |
e6dcd2dc CM |
1367 | } |
1368 | if (ordered) | |
1369 | btrfs_put_ordered_extent(ordered); | |
1370 | ||
2ac55d41 | 1371 | clear_extent_bit(&BTRFS_I(inode)->io_tree, start_pos, |
376cc685 | 1372 | last_pos, EXTENT_DIRTY | EXTENT_DELALLOC | |
9e8a4a8b | 1373 | EXTENT_DO_ACCOUNTING | EXTENT_DEFRAG, |
376cc685 MX |
1374 | 0, 0, cached_state, GFP_NOFS); |
1375 | *lockstart = start_pos; | |
1376 | *lockend = last_pos; | |
1377 | ret = 1; | |
0762704b | 1378 | } |
376cc685 | 1379 | |
e6dcd2dc | 1380 | for (i = 0; i < num_pages; i++) { |
32c7f202 WF |
1381 | if (clear_page_dirty_for_io(pages[i])) |
1382 | account_page_redirty(pages[i]); | |
e6dcd2dc CM |
1383 | set_page_extent_mapped(pages[i]); |
1384 | WARN_ON(!PageLocked(pages[i])); | |
1385 | } | |
b1bf862e | 1386 | |
376cc685 | 1387 | return ret; |
39279cc3 CM |
1388 | } |
1389 | ||
7ee9e440 JB |
1390 | static noinline int check_can_nocow(struct inode *inode, loff_t pos, |
1391 | size_t *write_bytes) | |
1392 | { | |
7ee9e440 JB |
1393 | struct btrfs_root *root = BTRFS_I(inode)->root; |
1394 | struct btrfs_ordered_extent *ordered; | |
1395 | u64 lockstart, lockend; | |
1396 | u64 num_bytes; | |
1397 | int ret; | |
1398 | ||
1399 | lockstart = round_down(pos, root->sectorsize); | |
1400 | lockend = lockstart + round_up(*write_bytes, root->sectorsize) - 1; | |
1401 | ||
1402 | while (1) { | |
1403 | lock_extent(&BTRFS_I(inode)->io_tree, lockstart, lockend); | |
1404 | ordered = btrfs_lookup_ordered_range(inode, lockstart, | |
1405 | lockend - lockstart + 1); | |
1406 | if (!ordered) { | |
1407 | break; | |
1408 | } | |
1409 | unlock_extent(&BTRFS_I(inode)->io_tree, lockstart, lockend); | |
1410 | btrfs_start_ordered_extent(inode, ordered, 1); | |
1411 | btrfs_put_ordered_extent(ordered); | |
1412 | } | |
1413 | ||
7ee9e440 | 1414 | num_bytes = lockend - lockstart + 1; |
00361589 | 1415 | ret = can_nocow_extent(inode, lockstart, &num_bytes, NULL, NULL, NULL); |
7ee9e440 JB |
1416 | if (ret <= 0) { |
1417 | ret = 0; | |
1418 | } else { | |
1419 | clear_extent_bit(&BTRFS_I(inode)->io_tree, lockstart, lockend, | |
1420 | EXTENT_DIRTY | EXTENT_DELALLOC | | |
1421 | EXTENT_DO_ACCOUNTING | EXTENT_DEFRAG, 0, 0, | |
1422 | NULL, GFP_NOFS); | |
1423 | *write_bytes = min_t(size_t, *write_bytes, num_bytes); | |
1424 | } | |
1425 | ||
1426 | unlock_extent(&BTRFS_I(inode)->io_tree, lockstart, lockend); | |
1427 | ||
1428 | return ret; | |
1429 | } | |
1430 | ||
d0215f3e JB |
1431 | static noinline ssize_t __btrfs_buffered_write(struct file *file, |
1432 | struct iov_iter *i, | |
1433 | loff_t pos) | |
4b46fce2 | 1434 | { |
496ad9aa | 1435 | struct inode *inode = file_inode(file); |
11c65dcc | 1436 | struct btrfs_root *root = BTRFS_I(inode)->root; |
11c65dcc | 1437 | struct page **pages = NULL; |
376cc685 | 1438 | struct extent_state *cached_state = NULL; |
7ee9e440 | 1439 | u64 release_bytes = 0; |
376cc685 MX |
1440 | u64 lockstart; |
1441 | u64 lockend; | |
39279cc3 | 1442 | unsigned long first_index; |
d0215f3e JB |
1443 | size_t num_written = 0; |
1444 | int nrptrs; | |
c9149235 | 1445 | int ret = 0; |
7ee9e440 | 1446 | bool only_release_metadata = false; |
b6316429 | 1447 | bool force_page_uptodate = false; |
376cc685 | 1448 | bool need_unlock; |
4b46fce2 | 1449 | |
d0215f3e | 1450 | nrptrs = min((iov_iter_count(i) + PAGE_CACHE_SIZE - 1) / |
11c65dcc JB |
1451 | PAGE_CACHE_SIZE, PAGE_CACHE_SIZE / |
1452 | (sizeof(struct page *))); | |
142349f5 WF |
1453 | nrptrs = min(nrptrs, current->nr_dirtied_pause - current->nr_dirtied); |
1454 | nrptrs = max(nrptrs, 8); | |
8c2383c3 | 1455 | pages = kmalloc(nrptrs * sizeof(struct page *), GFP_KERNEL); |
d0215f3e JB |
1456 | if (!pages) |
1457 | return -ENOMEM; | |
ab93dbec | 1458 | |
39279cc3 | 1459 | first_index = pos >> PAGE_CACHE_SHIFT; |
39279cc3 | 1460 | |
d0215f3e | 1461 | while (iov_iter_count(i) > 0) { |
39279cc3 | 1462 | size_t offset = pos & (PAGE_CACHE_SIZE - 1); |
d0215f3e | 1463 | size_t write_bytes = min(iov_iter_count(i), |
11c65dcc | 1464 | nrptrs * (size_t)PAGE_CACHE_SIZE - |
8c2383c3 | 1465 | offset); |
3a90983d YZ |
1466 | size_t num_pages = (write_bytes + offset + |
1467 | PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT; | |
7ee9e440 | 1468 | size_t reserve_bytes; |
d0215f3e JB |
1469 | size_t dirty_pages; |
1470 | size_t copied; | |
39279cc3 | 1471 | |
8c2383c3 | 1472 | WARN_ON(num_pages > nrptrs); |
1832a6d5 | 1473 | |
914ee295 XZ |
1474 | /* |
1475 | * Fault pages before locking them in prepare_pages | |
1476 | * to avoid recursive lock | |
1477 | */ | |
d0215f3e | 1478 | if (unlikely(iov_iter_fault_in_readable(i, write_bytes))) { |
914ee295 | 1479 | ret = -EFAULT; |
d0215f3e | 1480 | break; |
914ee295 XZ |
1481 | } |
1482 | ||
7ee9e440 JB |
1483 | reserve_bytes = num_pages << PAGE_CACHE_SHIFT; |
1484 | ret = btrfs_check_data_free_space(inode, reserve_bytes); | |
1485 | if (ret == -ENOSPC && | |
1486 | (BTRFS_I(inode)->flags & (BTRFS_INODE_NODATACOW | | |
1487 | BTRFS_INODE_PREALLOC))) { | |
1488 | ret = check_can_nocow(inode, pos, &write_bytes); | |
1489 | if (ret > 0) { | |
1490 | only_release_metadata = true; | |
1491 | /* | |
1492 | * our prealloc extent may be smaller than | |
1493 | * write_bytes, so scale down. | |
1494 | */ | |
1495 | num_pages = (write_bytes + offset + | |
1496 | PAGE_CACHE_SIZE - 1) >> | |
1497 | PAGE_CACHE_SHIFT; | |
1498 | reserve_bytes = num_pages << PAGE_CACHE_SHIFT; | |
1499 | ret = 0; | |
1500 | } else { | |
1501 | ret = -ENOSPC; | |
1502 | } | |
1503 | } | |
1504 | ||
1832a6d5 | 1505 | if (ret) |
d0215f3e | 1506 | break; |
1832a6d5 | 1507 | |
7ee9e440 JB |
1508 | ret = btrfs_delalloc_reserve_metadata(inode, reserve_bytes); |
1509 | if (ret) { | |
1510 | if (!only_release_metadata) | |
1511 | btrfs_free_reserved_data_space(inode, | |
1512 | reserve_bytes); | |
1513 | break; | |
1514 | } | |
1515 | ||
1516 | release_bytes = reserve_bytes; | |
376cc685 MX |
1517 | need_unlock = false; |
1518 | again: | |
4a64001f JB |
1519 | /* |
1520 | * This is going to setup the pages array with the number of | |
1521 | * pages we want, so we don't really need to worry about the | |
1522 | * contents of pages from loop to loop | |
1523 | */ | |
b37392ea MX |
1524 | ret = prepare_pages(inode, pages, num_pages, |
1525 | pos, write_bytes, | |
b6316429 | 1526 | force_page_uptodate); |
7ee9e440 | 1527 | if (ret) |
d0215f3e | 1528 | break; |
39279cc3 | 1529 | |
376cc685 MX |
1530 | ret = lock_and_cleanup_extent_if_need(inode, pages, num_pages, |
1531 | pos, &lockstart, &lockend, | |
1532 | &cached_state); | |
1533 | if (ret < 0) { | |
1534 | if (ret == -EAGAIN) | |
1535 | goto again; | |
1536 | break; | |
1537 | } else if (ret > 0) { | |
1538 | need_unlock = true; | |
1539 | ret = 0; | |
1540 | } | |
1541 | ||
914ee295 | 1542 | copied = btrfs_copy_from_user(pos, num_pages, |
d0215f3e | 1543 | write_bytes, pages, i); |
b1bf862e CM |
1544 | |
1545 | /* | |
1546 | * if we have trouble faulting in the pages, fall | |
1547 | * back to one page at a time | |
1548 | */ | |
1549 | if (copied < write_bytes) | |
1550 | nrptrs = 1; | |
1551 | ||
b6316429 JB |
1552 | if (copied == 0) { |
1553 | force_page_uptodate = true; | |
b1bf862e | 1554 | dirty_pages = 0; |
b6316429 JB |
1555 | } else { |
1556 | force_page_uptodate = false; | |
b1bf862e CM |
1557 | dirty_pages = (copied + offset + |
1558 | PAGE_CACHE_SIZE - 1) >> | |
1559 | PAGE_CACHE_SHIFT; | |
b6316429 | 1560 | } |
914ee295 | 1561 | |
d0215f3e JB |
1562 | /* |
1563 | * If we had a short copy we need to release the excess delaloc | |
1564 | * bytes we reserved. We need to increment outstanding_extents | |
1565 | * because btrfs_delalloc_release_space will decrement it, but | |
1566 | * we still have an outstanding extent for the chunk we actually | |
1567 | * managed to copy. | |
1568 | */ | |
914ee295 | 1569 | if (num_pages > dirty_pages) { |
7ee9e440 JB |
1570 | release_bytes = (num_pages - dirty_pages) << |
1571 | PAGE_CACHE_SHIFT; | |
9e0baf60 JB |
1572 | if (copied > 0) { |
1573 | spin_lock(&BTRFS_I(inode)->lock); | |
1574 | BTRFS_I(inode)->outstanding_extents++; | |
1575 | spin_unlock(&BTRFS_I(inode)->lock); | |
1576 | } | |
7ee9e440 JB |
1577 | if (only_release_metadata) |
1578 | btrfs_delalloc_release_metadata(inode, | |
1579 | release_bytes); | |
1580 | else | |
1581 | btrfs_delalloc_release_space(inode, | |
1582 | release_bytes); | |
914ee295 XZ |
1583 | } |
1584 | ||
7ee9e440 | 1585 | release_bytes = dirty_pages << PAGE_CACHE_SHIFT; |
376cc685 MX |
1586 | |
1587 | if (copied > 0) | |
be1a12a0 JB |
1588 | ret = btrfs_dirty_pages(root, inode, pages, |
1589 | dirty_pages, pos, copied, | |
1590 | NULL); | |
376cc685 MX |
1591 | if (need_unlock) |
1592 | unlock_extent_cached(&BTRFS_I(inode)->io_tree, | |
1593 | lockstart, lockend, &cached_state, | |
1594 | GFP_NOFS); | |
f1de9683 MX |
1595 | if (ret) { |
1596 | btrfs_drop_pages(pages, num_pages); | |
376cc685 | 1597 | break; |
f1de9683 | 1598 | } |
39279cc3 | 1599 | |
376cc685 | 1600 | release_bytes = 0; |
7ee9e440 JB |
1601 | if (only_release_metadata && copied > 0) { |
1602 | u64 lockstart = round_down(pos, root->sectorsize); | |
1603 | u64 lockend = lockstart + | |
1604 | (dirty_pages << PAGE_CACHE_SHIFT) - 1; | |
1605 | ||
1606 | set_extent_bit(&BTRFS_I(inode)->io_tree, lockstart, | |
1607 | lockend, EXTENT_NORESERVE, NULL, | |
1608 | NULL, GFP_NOFS); | |
1609 | only_release_metadata = false; | |
1610 | } | |
1611 | ||
f1de9683 MX |
1612 | btrfs_drop_pages(pages, num_pages); |
1613 | ||
d0215f3e JB |
1614 | cond_resched(); |
1615 | ||
d0e1d66b | 1616 | balance_dirty_pages_ratelimited(inode->i_mapping); |
d0215f3e | 1617 | if (dirty_pages < (root->leafsize >> PAGE_CACHE_SHIFT) + 1) |
b53d3f5d | 1618 | btrfs_btree_balance_dirty(root); |
cb843a6f | 1619 | |
914ee295 XZ |
1620 | pos += copied; |
1621 | num_written += copied; | |
d0215f3e | 1622 | } |
39279cc3 | 1623 | |
d0215f3e JB |
1624 | kfree(pages); |
1625 | ||
7ee9e440 JB |
1626 | if (release_bytes) { |
1627 | if (only_release_metadata) | |
1628 | btrfs_delalloc_release_metadata(inode, release_bytes); | |
1629 | else | |
1630 | btrfs_delalloc_release_space(inode, release_bytes); | |
1631 | } | |
1632 | ||
d0215f3e JB |
1633 | return num_written ? num_written : ret; |
1634 | } | |
1635 | ||
1636 | static ssize_t __btrfs_direct_write(struct kiocb *iocb, | |
1637 | const struct iovec *iov, | |
1638 | unsigned long nr_segs, loff_t pos, | |
1639 | loff_t *ppos, size_t count, size_t ocount) | |
1640 | { | |
1641 | struct file *file = iocb->ki_filp; | |
d0215f3e JB |
1642 | struct iov_iter i; |
1643 | ssize_t written; | |
1644 | ssize_t written_buffered; | |
1645 | loff_t endbyte; | |
1646 | int err; | |
1647 | ||
1648 | written = generic_file_direct_write(iocb, iov, &nr_segs, pos, ppos, | |
1649 | count, ocount); | |
1650 | ||
d0215f3e JB |
1651 | if (written < 0 || written == count) |
1652 | return written; | |
1653 | ||
1654 | pos += written; | |
1655 | count -= written; | |
1656 | iov_iter_init(&i, iov, nr_segs, count, written); | |
1657 | written_buffered = __btrfs_buffered_write(file, &i, pos); | |
1658 | if (written_buffered < 0) { | |
1659 | err = written_buffered; | |
1660 | goto out; | |
39279cc3 | 1661 | } |
d0215f3e JB |
1662 | endbyte = pos + written_buffered - 1; |
1663 | err = filemap_write_and_wait_range(file->f_mapping, pos, endbyte); | |
1664 | if (err) | |
1665 | goto out; | |
1666 | written += written_buffered; | |
1667 | *ppos = pos + written_buffered; | |
1668 | invalidate_mapping_pages(file->f_mapping, pos >> PAGE_CACHE_SHIFT, | |
1669 | endbyte >> PAGE_CACHE_SHIFT); | |
39279cc3 | 1670 | out: |
d0215f3e JB |
1671 | return written ? written : err; |
1672 | } | |
5b92ee72 | 1673 | |
6c760c07 JB |
1674 | static void update_time_for_write(struct inode *inode) |
1675 | { | |
1676 | struct timespec now; | |
1677 | ||
1678 | if (IS_NOCMTIME(inode)) | |
1679 | return; | |
1680 | ||
1681 | now = current_fs_time(inode->i_sb); | |
1682 | if (!timespec_equal(&inode->i_mtime, &now)) | |
1683 | inode->i_mtime = now; | |
1684 | ||
1685 | if (!timespec_equal(&inode->i_ctime, &now)) | |
1686 | inode->i_ctime = now; | |
1687 | ||
1688 | if (IS_I_VERSION(inode)) | |
1689 | inode_inc_iversion(inode); | |
1690 | } | |
1691 | ||
d0215f3e JB |
1692 | static ssize_t btrfs_file_aio_write(struct kiocb *iocb, |
1693 | const struct iovec *iov, | |
1694 | unsigned long nr_segs, loff_t pos) | |
1695 | { | |
1696 | struct file *file = iocb->ki_filp; | |
496ad9aa | 1697 | struct inode *inode = file_inode(file); |
d0215f3e JB |
1698 | struct btrfs_root *root = BTRFS_I(inode)->root; |
1699 | loff_t *ppos = &iocb->ki_pos; | |
0c1a98c8 | 1700 | u64 start_pos; |
d0215f3e JB |
1701 | ssize_t num_written = 0; |
1702 | ssize_t err = 0; | |
1703 | size_t count, ocount; | |
b812ce28 | 1704 | bool sync = (file->f_flags & O_DSYNC) || IS_SYNC(file->f_mapping->host); |
d0215f3e | 1705 | |
d0215f3e JB |
1706 | mutex_lock(&inode->i_mutex); |
1707 | ||
1708 | err = generic_segment_checks(iov, &nr_segs, &ocount, VERIFY_READ); | |
1709 | if (err) { | |
1710 | mutex_unlock(&inode->i_mutex); | |
1711 | goto out; | |
1712 | } | |
1713 | count = ocount; | |
1714 | ||
1715 | current->backing_dev_info = inode->i_mapping->backing_dev_info; | |
1716 | err = generic_write_checks(file, &pos, &count, S_ISBLK(inode->i_mode)); | |
1717 | if (err) { | |
1718 | mutex_unlock(&inode->i_mutex); | |
1719 | goto out; | |
1720 | } | |
1721 | ||
1722 | if (count == 0) { | |
1723 | mutex_unlock(&inode->i_mutex); | |
1724 | goto out; | |
1725 | } | |
1726 | ||
1727 | err = file_remove_suid(file); | |
1728 | if (err) { | |
1729 | mutex_unlock(&inode->i_mutex); | |
1730 | goto out; | |
1731 | } | |
1732 | ||
1733 | /* | |
1734 | * If BTRFS flips readonly due to some impossible error | |
1735 | * (fs_info->fs_state now has BTRFS_SUPER_FLAG_ERROR), | |
1736 | * although we have opened a file as writable, we have | |
1737 | * to stop this write operation to ensure FS consistency. | |
1738 | */ | |
87533c47 | 1739 | if (test_bit(BTRFS_FS_STATE_ERROR, &root->fs_info->fs_state)) { |
d0215f3e JB |
1740 | mutex_unlock(&inode->i_mutex); |
1741 | err = -EROFS; | |
1742 | goto out; | |
1743 | } | |
1744 | ||
6c760c07 JB |
1745 | /* |
1746 | * We reserve space for updating the inode when we reserve space for the | |
1747 | * extent we are going to write, so we will enospc out there. We don't | |
1748 | * need to start yet another transaction to update the inode as we will | |
1749 | * update the inode when we finish writing whatever data we write. | |
1750 | */ | |
1751 | update_time_for_write(inode); | |
d0215f3e | 1752 | |
0c1a98c8 MX |
1753 | start_pos = round_down(pos, root->sectorsize); |
1754 | if (start_pos > i_size_read(inode)) { | |
1755 | err = btrfs_cont_expand(inode, i_size_read(inode), start_pos); | |
1756 | if (err) { | |
1757 | mutex_unlock(&inode->i_mutex); | |
1758 | goto out; | |
1759 | } | |
1760 | } | |
1761 | ||
b812ce28 JB |
1762 | if (sync) |
1763 | atomic_inc(&BTRFS_I(inode)->sync_writers); | |
1764 | ||
d0215f3e JB |
1765 | if (unlikely(file->f_flags & O_DIRECT)) { |
1766 | num_written = __btrfs_direct_write(iocb, iov, nr_segs, | |
1767 | pos, ppos, count, ocount); | |
1768 | } else { | |
1769 | struct iov_iter i; | |
1770 | ||
1771 | iov_iter_init(&i, iov, nr_segs, count, num_written); | |
1772 | ||
1773 | num_written = __btrfs_buffered_write(file, &i, pos); | |
1774 | if (num_written > 0) | |
1775 | *ppos = pos + num_written; | |
1776 | } | |
1777 | ||
1778 | mutex_unlock(&inode->i_mutex); | |
2ff3e9b6 | 1779 | |
5a3f23d5 CM |
1780 | /* |
1781 | * we want to make sure fsync finds this change | |
1782 | * but we haven't joined a transaction running right now. | |
1783 | * | |
1784 | * Later on, someone is sure to update the inode and get the | |
1785 | * real transid recorded. | |
1786 | * | |
1787 | * We set last_trans now to the fs_info generation + 1, | |
1788 | * this will either be one more than the running transaction | |
1789 | * or the generation used for the next transaction if there isn't | |
1790 | * one running right now. | |
6c760c07 JB |
1791 | * |
1792 | * We also have to set last_sub_trans to the current log transid, | |
1793 | * otherwise subsequent syncs to a file that's been synced in this | |
1794 | * transaction will appear to have already occured. | |
5a3f23d5 CM |
1795 | */ |
1796 | BTRFS_I(inode)->last_trans = root->fs_info->generation + 1; | |
6c760c07 | 1797 | BTRFS_I(inode)->last_sub_trans = root->log_transid; |
02afc27f | 1798 | if (num_written > 0) { |
d0215f3e JB |
1799 | err = generic_write_sync(file, pos, num_written); |
1800 | if (err < 0 && num_written > 0) | |
2ff3e9b6 CM |
1801 | num_written = err; |
1802 | } | |
0a3404dc | 1803 | |
b812ce28 JB |
1804 | if (sync) |
1805 | atomic_dec(&BTRFS_I(inode)->sync_writers); | |
0a3404dc | 1806 | out: |
39279cc3 | 1807 | current->backing_dev_info = NULL; |
39279cc3 CM |
1808 | return num_written ? num_written : err; |
1809 | } | |
1810 | ||
d397712b | 1811 | int btrfs_release_file(struct inode *inode, struct file *filp) |
e1b81e67 | 1812 | { |
5a3f23d5 CM |
1813 | /* |
1814 | * ordered_data_close is set by settattr when we are about to truncate | |
1815 | * a file from a non-zero size to a zero size. This tries to | |
1816 | * flush down new bytes that may have been written if the | |
1817 | * application were using truncate to replace a file in place. | |
1818 | */ | |
72ac3c0d JB |
1819 | if (test_and_clear_bit(BTRFS_INODE_ORDERED_DATA_CLOSE, |
1820 | &BTRFS_I(inode)->runtime_flags)) { | |
569e0f35 JB |
1821 | struct btrfs_trans_handle *trans; |
1822 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
1823 | ||
1824 | /* | |
1825 | * We need to block on a committing transaction to keep us from | |
1826 | * throwing a ordered operation on to the list and causing | |
1827 | * something like sync to deadlock trying to flush out this | |
1828 | * inode. | |
1829 | */ | |
1830 | trans = btrfs_start_transaction(root, 0); | |
1831 | if (IS_ERR(trans)) | |
1832 | return PTR_ERR(trans); | |
1833 | btrfs_add_ordered_operation(trans, BTRFS_I(inode)->root, inode); | |
1834 | btrfs_end_transaction(trans, root); | |
5a3f23d5 CM |
1835 | if (inode->i_size > BTRFS_ORDERED_OPERATIONS_FLUSH_LIMIT) |
1836 | filemap_flush(inode->i_mapping); | |
1837 | } | |
6bf13c0c SW |
1838 | if (filp->private_data) |
1839 | btrfs_ioctl_trans_end(filp); | |
e1b81e67 M |
1840 | return 0; |
1841 | } | |
1842 | ||
d352ac68 CM |
1843 | /* |
1844 | * fsync call for both files and directories. This logs the inode into | |
1845 | * the tree log instead of forcing full commits whenever possible. | |
1846 | * | |
1847 | * It needs to call filemap_fdatawait so that all ordered extent updates are | |
1848 | * in the metadata btree are up to date for copying to the log. | |
1849 | * | |
1850 | * It drops the inode mutex before doing the tree log commit. This is an | |
1851 | * important optimization for directories because holding the mutex prevents | |
1852 | * new operations on the dir while we write to disk. | |
1853 | */ | |
02c24a82 | 1854 | int btrfs_sync_file(struct file *file, loff_t start, loff_t end, int datasync) |
39279cc3 | 1855 | { |
7ea80859 | 1856 | struct dentry *dentry = file->f_path.dentry; |
39279cc3 CM |
1857 | struct inode *inode = dentry->d_inode; |
1858 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
15ee9bc7 | 1859 | int ret = 0; |
39279cc3 | 1860 | struct btrfs_trans_handle *trans; |
2ab28f32 | 1861 | bool full_sync = 0; |
39279cc3 | 1862 | |
1abe9b8a | 1863 | trace_btrfs_sync_file(file, datasync); |
257c62e1 | 1864 | |
90abccf2 MX |
1865 | /* |
1866 | * We write the dirty pages in the range and wait until they complete | |
1867 | * out of the ->i_mutex. If so, we can flush the dirty pages by | |
2ab28f32 JB |
1868 | * multi-task, and make the performance up. See |
1869 | * btrfs_wait_ordered_range for an explanation of the ASYNC check. | |
90abccf2 | 1870 | */ |
b812ce28 | 1871 | atomic_inc(&BTRFS_I(inode)->sync_writers); |
2ab28f32 JB |
1872 | ret = filemap_fdatawrite_range(inode->i_mapping, start, end); |
1873 | if (!ret && test_bit(BTRFS_INODE_HAS_ASYNC_EXTENT, | |
1874 | &BTRFS_I(inode)->runtime_flags)) | |
1875 | ret = filemap_fdatawrite_range(inode->i_mapping, start, end); | |
b812ce28 | 1876 | atomic_dec(&BTRFS_I(inode)->sync_writers); |
90abccf2 MX |
1877 | if (ret) |
1878 | return ret; | |
1879 | ||
02c24a82 JB |
1880 | mutex_lock(&inode->i_mutex); |
1881 | ||
0885ef5b | 1882 | /* |
90abccf2 MX |
1883 | * We flush the dirty pages again to avoid some dirty pages in the |
1884 | * range being left. | |
0885ef5b | 1885 | */ |
2ecb7923 | 1886 | atomic_inc(&root->log_batch); |
2ab28f32 JB |
1887 | full_sync = test_bit(BTRFS_INODE_NEEDS_FULL_SYNC, |
1888 | &BTRFS_I(inode)->runtime_flags); | |
0ef8b726 JB |
1889 | if (full_sync) { |
1890 | ret = btrfs_wait_ordered_range(inode, start, end - start + 1); | |
1891 | if (ret) { | |
1892 | mutex_unlock(&inode->i_mutex); | |
1893 | goto out; | |
1894 | } | |
1895 | } | |
2ecb7923 | 1896 | atomic_inc(&root->log_batch); |
257c62e1 | 1897 | |
39279cc3 | 1898 | /* |
15ee9bc7 JB |
1899 | * check the transaction that last modified this inode |
1900 | * and see if its already been committed | |
39279cc3 | 1901 | */ |
02c24a82 JB |
1902 | if (!BTRFS_I(inode)->last_trans) { |
1903 | mutex_unlock(&inode->i_mutex); | |
15ee9bc7 | 1904 | goto out; |
02c24a82 | 1905 | } |
a2135011 | 1906 | |
257c62e1 CM |
1907 | /* |
1908 | * if the last transaction that changed this file was before | |
1909 | * the current transaction, we can bail out now without any | |
1910 | * syncing | |
1911 | */ | |
a4abeea4 | 1912 | smp_mb(); |
22ee6985 JB |
1913 | if (btrfs_inode_in_log(inode, root->fs_info->generation) || |
1914 | BTRFS_I(inode)->last_trans <= | |
15ee9bc7 JB |
1915 | root->fs_info->last_trans_committed) { |
1916 | BTRFS_I(inode)->last_trans = 0; | |
5dc562c5 JB |
1917 | |
1918 | /* | |
1919 | * We'v had everything committed since the last time we were | |
1920 | * modified so clear this flag in case it was set for whatever | |
1921 | * reason, it's no longer relevant. | |
1922 | */ | |
1923 | clear_bit(BTRFS_INODE_NEEDS_FULL_SYNC, | |
1924 | &BTRFS_I(inode)->runtime_flags); | |
02c24a82 | 1925 | mutex_unlock(&inode->i_mutex); |
15ee9bc7 JB |
1926 | goto out; |
1927 | } | |
15ee9bc7 JB |
1928 | |
1929 | /* | |
a52d9a80 CM |
1930 | * ok we haven't committed the transaction yet, lets do a commit |
1931 | */ | |
6f902af4 | 1932 | if (file->private_data) |
6bf13c0c SW |
1933 | btrfs_ioctl_trans_end(file); |
1934 | ||
5039eddc JB |
1935 | /* |
1936 | * We use start here because we will need to wait on the IO to complete | |
1937 | * in btrfs_sync_log, which could require joining a transaction (for | |
1938 | * example checking cross references in the nocow path). If we use join | |
1939 | * here we could get into a situation where we're waiting on IO to | |
1940 | * happen that is blocked on a transaction trying to commit. With start | |
1941 | * we inc the extwriter counter, so we wait for all extwriters to exit | |
1942 | * before we start blocking join'ers. This comment is to keep somebody | |
1943 | * from thinking they are super smart and changing this to | |
1944 | * btrfs_join_transaction *cough*Josef*cough*. | |
1945 | */ | |
a22285a6 YZ |
1946 | trans = btrfs_start_transaction(root, 0); |
1947 | if (IS_ERR(trans)) { | |
1948 | ret = PTR_ERR(trans); | |
02c24a82 | 1949 | mutex_unlock(&inode->i_mutex); |
39279cc3 CM |
1950 | goto out; |
1951 | } | |
5039eddc | 1952 | trans->sync = true; |
e02119d5 | 1953 | |
2cfbd50b | 1954 | ret = btrfs_log_dentry_safe(trans, root, dentry); |
02c24a82 | 1955 | if (ret < 0) { |
a0634be5 FDBM |
1956 | /* Fallthrough and commit/free transaction. */ |
1957 | ret = 1; | |
02c24a82 | 1958 | } |
49eb7e46 CM |
1959 | |
1960 | /* we've logged all the items and now have a consistent | |
1961 | * version of the file in the log. It is possible that | |
1962 | * someone will come in and modify the file, but that's | |
1963 | * fine because the log is consistent on disk, and we | |
1964 | * have references to all of the file's extents | |
1965 | * | |
1966 | * It is possible that someone will come in and log the | |
1967 | * file again, but that will end up using the synchronization | |
1968 | * inside btrfs_sync_log to keep things safe. | |
1969 | */ | |
02c24a82 | 1970 | mutex_unlock(&inode->i_mutex); |
49eb7e46 | 1971 | |
257c62e1 | 1972 | if (ret != BTRFS_NO_LOG_SYNC) { |
0ef8b726 | 1973 | if (!ret) { |
257c62e1 | 1974 | ret = btrfs_sync_log(trans, root); |
0ef8b726 | 1975 | if (!ret) { |
257c62e1 | 1976 | ret = btrfs_end_transaction(trans, root); |
0ef8b726 | 1977 | goto out; |
2ab28f32 | 1978 | } |
257c62e1 | 1979 | } |
0ef8b726 JB |
1980 | if (!full_sync) { |
1981 | ret = btrfs_wait_ordered_range(inode, start, | |
1982 | end - start + 1); | |
1983 | if (ret) | |
1984 | goto out; | |
1985 | } | |
1986 | ret = btrfs_commit_transaction(trans, root); | |
257c62e1 CM |
1987 | } else { |
1988 | ret = btrfs_end_transaction(trans, root); | |
e02119d5 | 1989 | } |
39279cc3 | 1990 | out: |
014e4ac4 | 1991 | return ret > 0 ? -EIO : ret; |
39279cc3 CM |
1992 | } |
1993 | ||
f0f37e2f | 1994 | static const struct vm_operations_struct btrfs_file_vm_ops = { |
92fee66d | 1995 | .fault = filemap_fault, |
9ebefb18 | 1996 | .page_mkwrite = btrfs_page_mkwrite, |
0b173bc4 | 1997 | .remap_pages = generic_file_remap_pages, |
9ebefb18 CM |
1998 | }; |
1999 | ||
2000 | static int btrfs_file_mmap(struct file *filp, struct vm_area_struct *vma) | |
2001 | { | |
058a457e MX |
2002 | struct address_space *mapping = filp->f_mapping; |
2003 | ||
2004 | if (!mapping->a_ops->readpage) | |
2005 | return -ENOEXEC; | |
2006 | ||
9ebefb18 | 2007 | file_accessed(filp); |
058a457e | 2008 | vma->vm_ops = &btrfs_file_vm_ops; |
058a457e | 2009 | |
9ebefb18 CM |
2010 | return 0; |
2011 | } | |
2012 | ||
2aaa6655 JB |
2013 | static int hole_mergeable(struct inode *inode, struct extent_buffer *leaf, |
2014 | int slot, u64 start, u64 end) | |
2015 | { | |
2016 | struct btrfs_file_extent_item *fi; | |
2017 | struct btrfs_key key; | |
2018 | ||
2019 | if (slot < 0 || slot >= btrfs_header_nritems(leaf)) | |
2020 | return 0; | |
2021 | ||
2022 | btrfs_item_key_to_cpu(leaf, &key, slot); | |
2023 | if (key.objectid != btrfs_ino(inode) || | |
2024 | key.type != BTRFS_EXTENT_DATA_KEY) | |
2025 | return 0; | |
2026 | ||
2027 | fi = btrfs_item_ptr(leaf, slot, struct btrfs_file_extent_item); | |
2028 | ||
2029 | if (btrfs_file_extent_type(leaf, fi) != BTRFS_FILE_EXTENT_REG) | |
2030 | return 0; | |
2031 | ||
2032 | if (btrfs_file_extent_disk_bytenr(leaf, fi)) | |
2033 | return 0; | |
2034 | ||
2035 | if (key.offset == end) | |
2036 | return 1; | |
2037 | if (key.offset + btrfs_file_extent_num_bytes(leaf, fi) == start) | |
2038 | return 1; | |
2039 | return 0; | |
2040 | } | |
2041 | ||
2042 | static int fill_holes(struct btrfs_trans_handle *trans, struct inode *inode, | |
2043 | struct btrfs_path *path, u64 offset, u64 end) | |
2044 | { | |
2045 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
2046 | struct extent_buffer *leaf; | |
2047 | struct btrfs_file_extent_item *fi; | |
2048 | struct extent_map *hole_em; | |
2049 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; | |
2050 | struct btrfs_key key; | |
2051 | int ret; | |
2052 | ||
16e7549f JB |
2053 | if (btrfs_fs_incompat(root->fs_info, NO_HOLES)) |
2054 | goto out; | |
2055 | ||
2aaa6655 JB |
2056 | key.objectid = btrfs_ino(inode); |
2057 | key.type = BTRFS_EXTENT_DATA_KEY; | |
2058 | key.offset = offset; | |
2059 | ||
2aaa6655 JB |
2060 | ret = btrfs_search_slot(trans, root, &key, path, 0, 1); |
2061 | if (ret < 0) | |
2062 | return ret; | |
2063 | BUG_ON(!ret); | |
2064 | ||
2065 | leaf = path->nodes[0]; | |
2066 | if (hole_mergeable(inode, leaf, path->slots[0]-1, offset, end)) { | |
2067 | u64 num_bytes; | |
2068 | ||
2069 | path->slots[0]--; | |
2070 | fi = btrfs_item_ptr(leaf, path->slots[0], | |
2071 | struct btrfs_file_extent_item); | |
2072 | num_bytes = btrfs_file_extent_num_bytes(leaf, fi) + | |
2073 | end - offset; | |
2074 | btrfs_set_file_extent_num_bytes(leaf, fi, num_bytes); | |
2075 | btrfs_set_file_extent_ram_bytes(leaf, fi, num_bytes); | |
2076 | btrfs_set_file_extent_offset(leaf, fi, 0); | |
2077 | btrfs_mark_buffer_dirty(leaf); | |
2078 | goto out; | |
2079 | } | |
2080 | ||
2081 | if (hole_mergeable(inode, leaf, path->slots[0]+1, offset, end)) { | |
2082 | u64 num_bytes; | |
2083 | ||
2084 | path->slots[0]++; | |
2085 | key.offset = offset; | |
afe5fea7 | 2086 | btrfs_set_item_key_safe(root, path, &key); |
2aaa6655 JB |
2087 | fi = btrfs_item_ptr(leaf, path->slots[0], |
2088 | struct btrfs_file_extent_item); | |
2089 | num_bytes = btrfs_file_extent_num_bytes(leaf, fi) + end - | |
2090 | offset; | |
2091 | btrfs_set_file_extent_num_bytes(leaf, fi, num_bytes); | |
2092 | btrfs_set_file_extent_ram_bytes(leaf, fi, num_bytes); | |
2093 | btrfs_set_file_extent_offset(leaf, fi, 0); | |
2094 | btrfs_mark_buffer_dirty(leaf); | |
2095 | goto out; | |
2096 | } | |
2097 | btrfs_release_path(path); | |
2098 | ||
2099 | ret = btrfs_insert_file_extent(trans, root, btrfs_ino(inode), offset, | |
2100 | 0, 0, end - offset, 0, end - offset, | |
2101 | 0, 0, 0); | |
2102 | if (ret) | |
2103 | return ret; | |
2104 | ||
2105 | out: | |
2106 | btrfs_release_path(path); | |
2107 | ||
2108 | hole_em = alloc_extent_map(); | |
2109 | if (!hole_em) { | |
2110 | btrfs_drop_extent_cache(inode, offset, end - 1, 0); | |
2111 | set_bit(BTRFS_INODE_NEEDS_FULL_SYNC, | |
2112 | &BTRFS_I(inode)->runtime_flags); | |
2113 | } else { | |
2114 | hole_em->start = offset; | |
2115 | hole_em->len = end - offset; | |
cc95bef6 | 2116 | hole_em->ram_bytes = hole_em->len; |
2aaa6655 JB |
2117 | hole_em->orig_start = offset; |
2118 | ||
2119 | hole_em->block_start = EXTENT_MAP_HOLE; | |
2120 | hole_em->block_len = 0; | |
b4939680 | 2121 | hole_em->orig_block_len = 0; |
2aaa6655 JB |
2122 | hole_em->bdev = root->fs_info->fs_devices->latest_bdev; |
2123 | hole_em->compress_type = BTRFS_COMPRESS_NONE; | |
2124 | hole_em->generation = trans->transid; | |
2125 | ||
2126 | do { | |
2127 | btrfs_drop_extent_cache(inode, offset, end - 1, 0); | |
2128 | write_lock(&em_tree->lock); | |
09a2a8f9 | 2129 | ret = add_extent_mapping(em_tree, hole_em, 1); |
2aaa6655 JB |
2130 | write_unlock(&em_tree->lock); |
2131 | } while (ret == -EEXIST); | |
2132 | free_extent_map(hole_em); | |
2133 | if (ret) | |
2134 | set_bit(BTRFS_INODE_NEEDS_FULL_SYNC, | |
2135 | &BTRFS_I(inode)->runtime_flags); | |
2136 | } | |
2137 | ||
2138 | return 0; | |
2139 | } | |
2140 | ||
2141 | static int btrfs_punch_hole(struct inode *inode, loff_t offset, loff_t len) | |
2142 | { | |
2143 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
2144 | struct extent_state *cached_state = NULL; | |
2145 | struct btrfs_path *path; | |
2146 | struct btrfs_block_rsv *rsv; | |
2147 | struct btrfs_trans_handle *trans; | |
0061280d MX |
2148 | u64 lockstart = round_up(offset, BTRFS_I(inode)->root->sectorsize); |
2149 | u64 lockend = round_down(offset + len, | |
2150 | BTRFS_I(inode)->root->sectorsize) - 1; | |
2aaa6655 JB |
2151 | u64 cur_offset = lockstart; |
2152 | u64 min_size = btrfs_calc_trunc_metadata_size(root, 1); | |
2153 | u64 drop_end; | |
2aaa6655 JB |
2154 | int ret = 0; |
2155 | int err = 0; | |
16e7549f | 2156 | int rsv_count; |
6347b3c4 MX |
2157 | bool same_page = ((offset >> PAGE_CACHE_SHIFT) == |
2158 | ((offset + len - 1) >> PAGE_CACHE_SHIFT)); | |
16e7549f | 2159 | bool no_holes = btrfs_fs_incompat(root->fs_info, NO_HOLES); |
2aaa6655 | 2160 | |
0ef8b726 JB |
2161 | ret = btrfs_wait_ordered_range(inode, offset, len); |
2162 | if (ret) | |
2163 | return ret; | |
2aaa6655 JB |
2164 | |
2165 | mutex_lock(&inode->i_mutex); | |
7426cc04 MX |
2166 | /* |
2167 | * We needn't truncate any page which is beyond the end of the file | |
2168 | * because we are sure there is no data there. | |
2169 | */ | |
2aaa6655 JB |
2170 | /* |
2171 | * Only do this if we are in the same page and we aren't doing the | |
2172 | * entire page. | |
2173 | */ | |
2174 | if (same_page && len < PAGE_CACHE_SIZE) { | |
7426cc04 MX |
2175 | if (offset < round_up(inode->i_size, PAGE_CACHE_SIZE)) |
2176 | ret = btrfs_truncate_page(inode, offset, len, 0); | |
2aaa6655 JB |
2177 | mutex_unlock(&inode->i_mutex); |
2178 | return ret; | |
2179 | } | |
2180 | ||
2181 | /* zero back part of the first page */ | |
7426cc04 MX |
2182 | if (offset < round_up(inode->i_size, PAGE_CACHE_SIZE)) { |
2183 | ret = btrfs_truncate_page(inode, offset, 0, 0); | |
2184 | if (ret) { | |
2185 | mutex_unlock(&inode->i_mutex); | |
2186 | return ret; | |
2187 | } | |
2aaa6655 JB |
2188 | } |
2189 | ||
2190 | /* zero the front end of the last page */ | |
0061280d MX |
2191 | if (offset + len < round_up(inode->i_size, PAGE_CACHE_SIZE)) { |
2192 | ret = btrfs_truncate_page(inode, offset + len, 0, 1); | |
2193 | if (ret) { | |
2194 | mutex_unlock(&inode->i_mutex); | |
2195 | return ret; | |
2196 | } | |
2aaa6655 JB |
2197 | } |
2198 | ||
2199 | if (lockend < lockstart) { | |
2200 | mutex_unlock(&inode->i_mutex); | |
2201 | return 0; | |
2202 | } | |
2203 | ||
2204 | while (1) { | |
2205 | struct btrfs_ordered_extent *ordered; | |
2206 | ||
2207 | truncate_pagecache_range(inode, lockstart, lockend); | |
2208 | ||
2209 | lock_extent_bits(&BTRFS_I(inode)->io_tree, lockstart, lockend, | |
2210 | 0, &cached_state); | |
2211 | ordered = btrfs_lookup_first_ordered_extent(inode, lockend); | |
2212 | ||
2213 | /* | |
2214 | * We need to make sure we have no ordered extents in this range | |
2215 | * and nobody raced in and read a page in this range, if we did | |
2216 | * we need to try again. | |
2217 | */ | |
2218 | if ((!ordered || | |
6126e3ca | 2219 | (ordered->file_offset + ordered->len <= lockstart || |
2aaa6655 JB |
2220 | ordered->file_offset > lockend)) && |
2221 | !test_range_bit(&BTRFS_I(inode)->io_tree, lockstart, | |
2222 | lockend, EXTENT_UPTODATE, 0, | |
2223 | cached_state)) { | |
2224 | if (ordered) | |
2225 | btrfs_put_ordered_extent(ordered); | |
2226 | break; | |
2227 | } | |
2228 | if (ordered) | |
2229 | btrfs_put_ordered_extent(ordered); | |
2230 | unlock_extent_cached(&BTRFS_I(inode)->io_tree, lockstart, | |
2231 | lockend, &cached_state, GFP_NOFS); | |
0ef8b726 JB |
2232 | ret = btrfs_wait_ordered_range(inode, lockstart, |
2233 | lockend - lockstart + 1); | |
2234 | if (ret) { | |
2235 | mutex_unlock(&inode->i_mutex); | |
2236 | return ret; | |
2237 | } | |
2aaa6655 JB |
2238 | } |
2239 | ||
2240 | path = btrfs_alloc_path(); | |
2241 | if (!path) { | |
2242 | ret = -ENOMEM; | |
2243 | goto out; | |
2244 | } | |
2245 | ||
66d8f3dd | 2246 | rsv = btrfs_alloc_block_rsv(root, BTRFS_BLOCK_RSV_TEMP); |
2aaa6655 JB |
2247 | if (!rsv) { |
2248 | ret = -ENOMEM; | |
2249 | goto out_free; | |
2250 | } | |
2251 | rsv->size = btrfs_calc_trunc_metadata_size(root, 1); | |
2252 | rsv->failfast = 1; | |
2253 | ||
2254 | /* | |
2255 | * 1 - update the inode | |
2256 | * 1 - removing the extents in the range | |
16e7549f | 2257 | * 1 - adding the hole extent if no_holes isn't set |
2aaa6655 | 2258 | */ |
16e7549f JB |
2259 | rsv_count = no_holes ? 2 : 3; |
2260 | trans = btrfs_start_transaction(root, rsv_count); | |
2aaa6655 JB |
2261 | if (IS_ERR(trans)) { |
2262 | err = PTR_ERR(trans); | |
2263 | goto out_free; | |
2264 | } | |
2265 | ||
2266 | ret = btrfs_block_rsv_migrate(&root->fs_info->trans_block_rsv, rsv, | |
2267 | min_size); | |
2268 | BUG_ON(ret); | |
2269 | trans->block_rsv = rsv; | |
2270 | ||
2271 | while (cur_offset < lockend) { | |
2272 | ret = __btrfs_drop_extents(trans, root, inode, path, | |
2273 | cur_offset, lockend + 1, | |
1acae57b | 2274 | &drop_end, 1, 0, 0, NULL); |
2aaa6655 JB |
2275 | if (ret != -ENOSPC) |
2276 | break; | |
2277 | ||
2278 | trans->block_rsv = &root->fs_info->trans_block_rsv; | |
2279 | ||
2280 | ret = fill_holes(trans, inode, path, cur_offset, drop_end); | |
2281 | if (ret) { | |
2282 | err = ret; | |
2283 | break; | |
2284 | } | |
2285 | ||
2286 | cur_offset = drop_end; | |
2287 | ||
2288 | ret = btrfs_update_inode(trans, root, inode); | |
2289 | if (ret) { | |
2290 | err = ret; | |
2291 | break; | |
2292 | } | |
2293 | ||
2aaa6655 | 2294 | btrfs_end_transaction(trans, root); |
b53d3f5d | 2295 | btrfs_btree_balance_dirty(root); |
2aaa6655 | 2296 | |
16e7549f | 2297 | trans = btrfs_start_transaction(root, rsv_count); |
2aaa6655 JB |
2298 | if (IS_ERR(trans)) { |
2299 | ret = PTR_ERR(trans); | |
2300 | trans = NULL; | |
2301 | break; | |
2302 | } | |
2303 | ||
2304 | ret = btrfs_block_rsv_migrate(&root->fs_info->trans_block_rsv, | |
2305 | rsv, min_size); | |
2306 | BUG_ON(ret); /* shouldn't happen */ | |
2307 | trans->block_rsv = rsv; | |
2308 | } | |
2309 | ||
2310 | if (ret) { | |
2311 | err = ret; | |
2312 | goto out_trans; | |
2313 | } | |
2314 | ||
2315 | trans->block_rsv = &root->fs_info->trans_block_rsv; | |
2316 | ret = fill_holes(trans, inode, path, cur_offset, drop_end); | |
2317 | if (ret) { | |
2318 | err = ret; | |
2319 | goto out_trans; | |
2320 | } | |
2321 | ||
2322 | out_trans: | |
2323 | if (!trans) | |
2324 | goto out_free; | |
2325 | ||
e1f5790e TI |
2326 | inode_inc_iversion(inode); |
2327 | inode->i_mtime = inode->i_ctime = CURRENT_TIME; | |
2328 | ||
2aaa6655 JB |
2329 | trans->block_rsv = &root->fs_info->trans_block_rsv; |
2330 | ret = btrfs_update_inode(trans, root, inode); | |
2aaa6655 | 2331 | btrfs_end_transaction(trans, root); |
b53d3f5d | 2332 | btrfs_btree_balance_dirty(root); |
2aaa6655 JB |
2333 | out_free: |
2334 | btrfs_free_path(path); | |
2335 | btrfs_free_block_rsv(root, rsv); | |
2336 | out: | |
2337 | unlock_extent_cached(&BTRFS_I(inode)->io_tree, lockstart, lockend, | |
2338 | &cached_state, GFP_NOFS); | |
2339 | mutex_unlock(&inode->i_mutex); | |
2340 | if (ret && !err) | |
2341 | err = ret; | |
2342 | return err; | |
2343 | } | |
2344 | ||
2fe17c10 CH |
2345 | static long btrfs_fallocate(struct file *file, int mode, |
2346 | loff_t offset, loff_t len) | |
2347 | { | |
496ad9aa | 2348 | struct inode *inode = file_inode(file); |
2fe17c10 | 2349 | struct extent_state *cached_state = NULL; |
6113077c | 2350 | struct btrfs_root *root = BTRFS_I(inode)->root; |
2fe17c10 CH |
2351 | u64 cur_offset; |
2352 | u64 last_byte; | |
2353 | u64 alloc_start; | |
2354 | u64 alloc_end; | |
2355 | u64 alloc_hint = 0; | |
2356 | u64 locked_end; | |
2fe17c10 | 2357 | struct extent_map *em; |
797f4277 | 2358 | int blocksize = BTRFS_I(inode)->root->sectorsize; |
2fe17c10 CH |
2359 | int ret; |
2360 | ||
797f4277 MX |
2361 | alloc_start = round_down(offset, blocksize); |
2362 | alloc_end = round_up(offset + len, blocksize); | |
2fe17c10 | 2363 | |
2aaa6655 JB |
2364 | /* Make sure we aren't being give some crap mode */ |
2365 | if (mode & ~(FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE)) | |
2fe17c10 CH |
2366 | return -EOPNOTSUPP; |
2367 | ||
2aaa6655 JB |
2368 | if (mode & FALLOC_FL_PUNCH_HOLE) |
2369 | return btrfs_punch_hole(inode, offset, len); | |
2370 | ||
d98456fc CM |
2371 | /* |
2372 | * Make sure we have enough space before we do the | |
2373 | * allocation. | |
2374 | */ | |
0ff6fabd | 2375 | ret = btrfs_check_data_free_space(inode, alloc_end - alloc_start); |
d98456fc CM |
2376 | if (ret) |
2377 | return ret; | |
6113077c WS |
2378 | if (root->fs_info->quota_enabled) { |
2379 | ret = btrfs_qgroup_reserve(root, alloc_end - alloc_start); | |
2380 | if (ret) | |
2381 | goto out_reserve_fail; | |
2382 | } | |
d98456fc | 2383 | |
2fe17c10 CH |
2384 | mutex_lock(&inode->i_mutex); |
2385 | ret = inode_newsize_ok(inode, alloc_end); | |
2386 | if (ret) | |
2387 | goto out; | |
2388 | ||
2389 | if (alloc_start > inode->i_size) { | |
a41ad394 JB |
2390 | ret = btrfs_cont_expand(inode, i_size_read(inode), |
2391 | alloc_start); | |
2fe17c10 CH |
2392 | if (ret) |
2393 | goto out; | |
a71754fc JB |
2394 | } else { |
2395 | /* | |
2396 | * If we are fallocating from the end of the file onward we | |
2397 | * need to zero out the end of the page if i_size lands in the | |
2398 | * middle of a page. | |
2399 | */ | |
2400 | ret = btrfs_truncate_page(inode, inode->i_size, 0, 0); | |
2401 | if (ret) | |
2402 | goto out; | |
2fe17c10 CH |
2403 | } |
2404 | ||
a71754fc JB |
2405 | /* |
2406 | * wait for ordered IO before we have any locks. We'll loop again | |
2407 | * below with the locks held. | |
2408 | */ | |
0ef8b726 JB |
2409 | ret = btrfs_wait_ordered_range(inode, alloc_start, |
2410 | alloc_end - alloc_start); | |
2411 | if (ret) | |
2412 | goto out; | |
a71754fc | 2413 | |
2fe17c10 CH |
2414 | locked_end = alloc_end - 1; |
2415 | while (1) { | |
2416 | struct btrfs_ordered_extent *ordered; | |
2417 | ||
2418 | /* the extent lock is ordered inside the running | |
2419 | * transaction | |
2420 | */ | |
2421 | lock_extent_bits(&BTRFS_I(inode)->io_tree, alloc_start, | |
d0082371 | 2422 | locked_end, 0, &cached_state); |
2fe17c10 CH |
2423 | ordered = btrfs_lookup_first_ordered_extent(inode, |
2424 | alloc_end - 1); | |
2425 | if (ordered && | |
2426 | ordered->file_offset + ordered->len > alloc_start && | |
2427 | ordered->file_offset < alloc_end) { | |
2428 | btrfs_put_ordered_extent(ordered); | |
2429 | unlock_extent_cached(&BTRFS_I(inode)->io_tree, | |
2430 | alloc_start, locked_end, | |
2431 | &cached_state, GFP_NOFS); | |
2432 | /* | |
2433 | * we can't wait on the range with the transaction | |
2434 | * running or with the extent lock held | |
2435 | */ | |
0ef8b726 JB |
2436 | ret = btrfs_wait_ordered_range(inode, alloc_start, |
2437 | alloc_end - alloc_start); | |
2438 | if (ret) | |
2439 | goto out; | |
2fe17c10 CH |
2440 | } else { |
2441 | if (ordered) | |
2442 | btrfs_put_ordered_extent(ordered); | |
2443 | break; | |
2444 | } | |
2445 | } | |
2446 | ||
2447 | cur_offset = alloc_start; | |
2448 | while (1) { | |
f1e490a7 JB |
2449 | u64 actual_end; |
2450 | ||
2fe17c10 CH |
2451 | em = btrfs_get_extent(inode, NULL, 0, cur_offset, |
2452 | alloc_end - cur_offset, 0); | |
79787eaa JM |
2453 | if (IS_ERR_OR_NULL(em)) { |
2454 | if (!em) | |
2455 | ret = -ENOMEM; | |
2456 | else | |
2457 | ret = PTR_ERR(em); | |
2458 | break; | |
2459 | } | |
2fe17c10 | 2460 | last_byte = min(extent_map_end(em), alloc_end); |
f1e490a7 | 2461 | actual_end = min_t(u64, extent_map_end(em), offset + len); |
797f4277 | 2462 | last_byte = ALIGN(last_byte, blocksize); |
f1e490a7 | 2463 | |
2fe17c10 CH |
2464 | if (em->block_start == EXTENT_MAP_HOLE || |
2465 | (cur_offset >= inode->i_size && | |
2466 | !test_bit(EXTENT_FLAG_PREALLOC, &em->flags))) { | |
2467 | ret = btrfs_prealloc_file_range(inode, mode, cur_offset, | |
2468 | last_byte - cur_offset, | |
2469 | 1 << inode->i_blkbits, | |
2470 | offset + len, | |
2471 | &alloc_hint); | |
1b9c332b | 2472 | |
2fe17c10 CH |
2473 | if (ret < 0) { |
2474 | free_extent_map(em); | |
2475 | break; | |
2476 | } | |
f1e490a7 JB |
2477 | } else if (actual_end > inode->i_size && |
2478 | !(mode & FALLOC_FL_KEEP_SIZE)) { | |
2479 | /* | |
2480 | * We didn't need to allocate any more space, but we | |
2481 | * still extended the size of the file so we need to | |
2482 | * update i_size. | |
2483 | */ | |
2484 | inode->i_ctime = CURRENT_TIME; | |
2485 | i_size_write(inode, actual_end); | |
2486 | btrfs_ordered_update_i_size(inode, actual_end, NULL); | |
2fe17c10 CH |
2487 | } |
2488 | free_extent_map(em); | |
2489 | ||
2490 | cur_offset = last_byte; | |
2491 | if (cur_offset >= alloc_end) { | |
2492 | ret = 0; | |
2493 | break; | |
2494 | } | |
2495 | } | |
2496 | unlock_extent_cached(&BTRFS_I(inode)->io_tree, alloc_start, locked_end, | |
2497 | &cached_state, GFP_NOFS); | |
2fe17c10 CH |
2498 | out: |
2499 | mutex_unlock(&inode->i_mutex); | |
6113077c WS |
2500 | if (root->fs_info->quota_enabled) |
2501 | btrfs_qgroup_free(root, alloc_end - alloc_start); | |
2502 | out_reserve_fail: | |
d98456fc | 2503 | /* Let go of our reservation. */ |
0ff6fabd | 2504 | btrfs_free_reserved_data_space(inode, alloc_end - alloc_start); |
2fe17c10 CH |
2505 | return ret; |
2506 | } | |
2507 | ||
965c8e59 | 2508 | static int find_desired_extent(struct inode *inode, loff_t *offset, int whence) |
b2675157 JB |
2509 | { |
2510 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
7f4ca37c | 2511 | struct extent_map *em = NULL; |
b2675157 JB |
2512 | struct extent_state *cached_state = NULL; |
2513 | u64 lockstart = *offset; | |
2514 | u64 lockend = i_size_read(inode); | |
2515 | u64 start = *offset; | |
b2675157 | 2516 | u64 len = i_size_read(inode); |
b2675157 JB |
2517 | int ret = 0; |
2518 | ||
2519 | lockend = max_t(u64, root->sectorsize, lockend); | |
2520 | if (lockend <= lockstart) | |
2521 | lockend = lockstart + root->sectorsize; | |
2522 | ||
1214b53f | 2523 | lockend--; |
b2675157 JB |
2524 | len = lockend - lockstart + 1; |
2525 | ||
2526 | len = max_t(u64, len, root->sectorsize); | |
2527 | if (inode->i_size == 0) | |
2528 | return -ENXIO; | |
2529 | ||
2530 | lock_extent_bits(&BTRFS_I(inode)->io_tree, lockstart, lockend, 0, | |
d0082371 | 2531 | &cached_state); |
b2675157 | 2532 | |
7f4ca37c | 2533 | while (start < inode->i_size) { |
b2675157 JB |
2534 | em = btrfs_get_extent_fiemap(inode, NULL, 0, start, len, 0); |
2535 | if (IS_ERR(em)) { | |
6af021d8 | 2536 | ret = PTR_ERR(em); |
7f4ca37c | 2537 | em = NULL; |
b2675157 JB |
2538 | break; |
2539 | } | |
2540 | ||
7f4ca37c JB |
2541 | if (whence == SEEK_HOLE && |
2542 | (em->block_start == EXTENT_MAP_HOLE || | |
2543 | test_bit(EXTENT_FLAG_PREALLOC, &em->flags))) | |
2544 | break; | |
2545 | else if (whence == SEEK_DATA && | |
2546 | (em->block_start != EXTENT_MAP_HOLE && | |
2547 | !test_bit(EXTENT_FLAG_PREALLOC, &em->flags))) | |
2548 | break; | |
b2675157 JB |
2549 | |
2550 | start = em->start + em->len; | |
b2675157 | 2551 | free_extent_map(em); |
7f4ca37c | 2552 | em = NULL; |
b2675157 JB |
2553 | cond_resched(); |
2554 | } | |
7f4ca37c JB |
2555 | free_extent_map(em); |
2556 | if (!ret) { | |
2557 | if (whence == SEEK_DATA && start >= inode->i_size) | |
2558 | ret = -ENXIO; | |
2559 | else | |
2560 | *offset = min_t(loff_t, start, inode->i_size); | |
2561 | } | |
b2675157 JB |
2562 | unlock_extent_cached(&BTRFS_I(inode)->io_tree, lockstart, lockend, |
2563 | &cached_state, GFP_NOFS); | |
2564 | return ret; | |
2565 | } | |
2566 | ||
965c8e59 | 2567 | static loff_t btrfs_file_llseek(struct file *file, loff_t offset, int whence) |
b2675157 JB |
2568 | { |
2569 | struct inode *inode = file->f_mapping->host; | |
2570 | int ret; | |
2571 | ||
2572 | mutex_lock(&inode->i_mutex); | |
965c8e59 | 2573 | switch (whence) { |
b2675157 JB |
2574 | case SEEK_END: |
2575 | case SEEK_CUR: | |
965c8e59 | 2576 | offset = generic_file_llseek(file, offset, whence); |
b2675157 JB |
2577 | goto out; |
2578 | case SEEK_DATA: | |
2579 | case SEEK_HOLE: | |
48802c8a JL |
2580 | if (offset >= i_size_read(inode)) { |
2581 | mutex_unlock(&inode->i_mutex); | |
2582 | return -ENXIO; | |
2583 | } | |
2584 | ||
965c8e59 | 2585 | ret = find_desired_extent(inode, &offset, whence); |
b2675157 JB |
2586 | if (ret) { |
2587 | mutex_unlock(&inode->i_mutex); | |
2588 | return ret; | |
2589 | } | |
2590 | } | |
2591 | ||
46a1c2c7 | 2592 | offset = vfs_setpos(file, offset, inode->i_sb->s_maxbytes); |
b2675157 JB |
2593 | out: |
2594 | mutex_unlock(&inode->i_mutex); | |
2595 | return offset; | |
2596 | } | |
2597 | ||
828c0950 | 2598 | const struct file_operations btrfs_file_operations = { |
b2675157 | 2599 | .llseek = btrfs_file_llseek, |
39279cc3 | 2600 | .read = do_sync_read, |
4a001071 | 2601 | .write = do_sync_write, |
9ebefb18 | 2602 | .aio_read = generic_file_aio_read, |
e9906a98 | 2603 | .splice_read = generic_file_splice_read, |
11c65dcc | 2604 | .aio_write = btrfs_file_aio_write, |
9ebefb18 | 2605 | .mmap = btrfs_file_mmap, |
39279cc3 | 2606 | .open = generic_file_open, |
e1b81e67 | 2607 | .release = btrfs_release_file, |
39279cc3 | 2608 | .fsync = btrfs_sync_file, |
2fe17c10 | 2609 | .fallocate = btrfs_fallocate, |
34287aa3 | 2610 | .unlocked_ioctl = btrfs_ioctl, |
39279cc3 | 2611 | #ifdef CONFIG_COMPAT |
34287aa3 | 2612 | .compat_ioctl = btrfs_ioctl, |
39279cc3 CM |
2613 | #endif |
2614 | }; | |
9247f317 MX |
2615 | |
2616 | void btrfs_auto_defrag_exit(void) | |
2617 | { | |
2618 | if (btrfs_inode_defrag_cachep) | |
2619 | kmem_cache_destroy(btrfs_inode_defrag_cachep); | |
2620 | } | |
2621 | ||
2622 | int btrfs_auto_defrag_init(void) | |
2623 | { | |
2624 | btrfs_inode_defrag_cachep = kmem_cache_create("btrfs_inode_defrag", | |
2625 | sizeof(struct inode_defrag), 0, | |
2626 | SLAB_RECLAIM_ACCOUNT | SLAB_MEM_SPREAD, | |
2627 | NULL); | |
2628 | if (!btrfs_inode_defrag_cachep) | |
2629 | return -ENOMEM; | |
2630 | ||
2631 | return 0; | |
2632 | } |