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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
c1d7c514 | 2 | |
d1310b2e CM |
3 | #include <linux/bitops.h> |
4 | #include <linux/slab.h> | |
5 | #include <linux/bio.h> | |
6 | #include <linux/mm.h> | |
d1310b2e CM |
7 | #include <linux/pagemap.h> |
8 | #include <linux/page-flags.h> | |
d1310b2e CM |
9 | #include <linux/spinlock.h> |
10 | #include <linux/blkdev.h> | |
11 | #include <linux/swap.h> | |
d1310b2e CM |
12 | #include <linux/writeback.h> |
13 | #include <linux/pagevec.h> | |
268bb0ce | 14 | #include <linux/prefetch.h> |
90a887c9 | 15 | #include <linux/cleancache.h> |
d1310b2e | 16 | #include "extent_io.h" |
9c7d3a54 | 17 | #include "extent-io-tree.h" |
d1310b2e | 18 | #include "extent_map.h" |
902b22f3 DW |
19 | #include "ctree.h" |
20 | #include "btrfs_inode.h" | |
4a54c8c1 | 21 | #include "volumes.h" |
21adbd5c | 22 | #include "check-integrity.h" |
0b32f4bb | 23 | #include "locking.h" |
606686ee | 24 | #include "rcu-string.h" |
fe09e16c | 25 | #include "backref.h" |
6af49dbd | 26 | #include "disk-io.h" |
d1310b2e | 27 | |
d1310b2e CM |
28 | static struct kmem_cache *extent_state_cache; |
29 | static struct kmem_cache *extent_buffer_cache; | |
8ac9f7c1 | 30 | static struct bio_set btrfs_bioset; |
d1310b2e | 31 | |
27a3507d FM |
32 | static inline bool extent_state_in_tree(const struct extent_state *state) |
33 | { | |
34 | return !RB_EMPTY_NODE(&state->rb_node); | |
35 | } | |
36 | ||
6d49ba1b | 37 | #ifdef CONFIG_BTRFS_DEBUG |
d1310b2e CM |
38 | static LIST_HEAD(buffers); |
39 | static LIST_HEAD(states); | |
4bef0848 | 40 | |
d397712b | 41 | static DEFINE_SPINLOCK(leak_lock); |
6d49ba1b ES |
42 | |
43 | static inline | |
44 | void btrfs_leak_debug_add(struct list_head *new, struct list_head *head) | |
45 | { | |
46 | unsigned long flags; | |
47 | ||
48 | spin_lock_irqsave(&leak_lock, flags); | |
49 | list_add(new, head); | |
50 | spin_unlock_irqrestore(&leak_lock, flags); | |
51 | } | |
52 | ||
53 | static inline | |
54 | void btrfs_leak_debug_del(struct list_head *entry) | |
55 | { | |
56 | unsigned long flags; | |
57 | ||
58 | spin_lock_irqsave(&leak_lock, flags); | |
59 | list_del(entry); | |
60 | spin_unlock_irqrestore(&leak_lock, flags); | |
61 | } | |
62 | ||
33ca832f | 63 | static inline void btrfs_extent_buffer_leak_debug_check(void) |
6d49ba1b | 64 | { |
6d49ba1b ES |
65 | struct extent_buffer *eb; |
66 | ||
33ca832f JB |
67 | while (!list_empty(&buffers)) { |
68 | eb = list_entry(buffers.next, struct extent_buffer, leak_list); | |
69 | pr_err("BTRFS: buffer leak start %llu len %lu refs %d bflags %lu\n", | |
70 | eb->start, eb->len, atomic_read(&eb->refs), eb->bflags); | |
71 | list_del(&eb->leak_list); | |
72 | kmem_cache_free(extent_buffer_cache, eb); | |
73 | } | |
74 | } | |
75 | ||
76 | static inline void btrfs_extent_state_leak_debug_check(void) | |
77 | { | |
78 | struct extent_state *state; | |
79 | ||
6d49ba1b ES |
80 | while (!list_empty(&states)) { |
81 | state = list_entry(states.next, struct extent_state, leak_list); | |
9ee49a04 | 82 | pr_err("BTRFS: state leak: start %llu end %llu state %u in tree %d refs %d\n", |
27a3507d FM |
83 | state->start, state->end, state->state, |
84 | extent_state_in_tree(state), | |
b7ac31b7 | 85 | refcount_read(&state->refs)); |
6d49ba1b ES |
86 | list_del(&state->leak_list); |
87 | kmem_cache_free(extent_state_cache, state); | |
88 | } | |
6d49ba1b | 89 | } |
8d599ae1 | 90 | |
a5dee37d JB |
91 | #define btrfs_debug_check_extent_io_range(tree, start, end) \ |
92 | __btrfs_debug_check_extent_io_range(__func__, (tree), (start), (end)) | |
8d599ae1 | 93 | static inline void __btrfs_debug_check_extent_io_range(const char *caller, |
a5dee37d | 94 | struct extent_io_tree *tree, u64 start, u64 end) |
8d599ae1 | 95 | { |
65a680f6 NB |
96 | struct inode *inode = tree->private_data; |
97 | u64 isize; | |
98 | ||
99 | if (!inode || !is_data_inode(inode)) | |
100 | return; | |
101 | ||
102 | isize = i_size_read(inode); | |
103 | if (end >= PAGE_SIZE && (end % 2) == 0 && end != isize - 1) { | |
104 | btrfs_debug_rl(BTRFS_I(inode)->root->fs_info, | |
105 | "%s: ino %llu isize %llu odd range [%llu,%llu]", | |
106 | caller, btrfs_ino(BTRFS_I(inode)), isize, start, end); | |
107 | } | |
8d599ae1 | 108 | } |
6d49ba1b ES |
109 | #else |
110 | #define btrfs_leak_debug_add(new, head) do {} while (0) | |
111 | #define btrfs_leak_debug_del(entry) do {} while (0) | |
33ca832f JB |
112 | #define btrfs_extent_buffer_leak_debug_check() do {} while (0) |
113 | #define btrfs_extent_state_leak_debug_check() do {} while (0) | |
8d599ae1 | 114 | #define btrfs_debug_check_extent_io_range(c, s, e) do {} while (0) |
4bef0848 | 115 | #endif |
d1310b2e | 116 | |
d1310b2e CM |
117 | struct tree_entry { |
118 | u64 start; | |
119 | u64 end; | |
d1310b2e CM |
120 | struct rb_node rb_node; |
121 | }; | |
122 | ||
123 | struct extent_page_data { | |
124 | struct bio *bio; | |
771ed689 CM |
125 | /* tells writepage not to lock the state bits for this range |
126 | * it still does the unlocking | |
127 | */ | |
ffbd517d CM |
128 | unsigned int extent_locked:1; |
129 | ||
70fd7614 | 130 | /* tells the submit_bio code to use REQ_SYNC */ |
ffbd517d | 131 | unsigned int sync_io:1; |
d1310b2e CM |
132 | }; |
133 | ||
57599c7e | 134 | static int add_extent_changeset(struct extent_state *state, unsigned bits, |
d38ed27f QW |
135 | struct extent_changeset *changeset, |
136 | int set) | |
137 | { | |
138 | int ret; | |
139 | ||
140 | if (!changeset) | |
57599c7e | 141 | return 0; |
d38ed27f | 142 | if (set && (state->state & bits) == bits) |
57599c7e | 143 | return 0; |
fefdc557 | 144 | if (!set && (state->state & bits) == 0) |
57599c7e | 145 | return 0; |
d38ed27f | 146 | changeset->bytes_changed += state->end - state->start + 1; |
53d32359 | 147 | ret = ulist_add(&changeset->range_changed, state->start, state->end, |
d38ed27f | 148 | GFP_ATOMIC); |
57599c7e | 149 | return ret; |
d38ed27f QW |
150 | } |
151 | ||
bb58eb9e QW |
152 | static int __must_check submit_one_bio(struct bio *bio, int mirror_num, |
153 | unsigned long bio_flags) | |
154 | { | |
155 | blk_status_t ret = 0; | |
bb58eb9e | 156 | struct extent_io_tree *tree = bio->bi_private; |
bb58eb9e QW |
157 | |
158 | bio->bi_private = NULL; | |
159 | ||
160 | if (tree->ops) | |
161 | ret = tree->ops->submit_bio_hook(tree->private_data, bio, | |
50489a57 | 162 | mirror_num, bio_flags); |
bb58eb9e QW |
163 | else |
164 | btrfsic_submit_bio(bio); | |
165 | ||
166 | return blk_status_to_errno(ret); | |
167 | } | |
168 | ||
3065976b QW |
169 | /* Cleanup unsubmitted bios */ |
170 | static void end_write_bio(struct extent_page_data *epd, int ret) | |
171 | { | |
172 | if (epd->bio) { | |
173 | epd->bio->bi_status = errno_to_blk_status(ret); | |
174 | bio_endio(epd->bio); | |
175 | epd->bio = NULL; | |
176 | } | |
177 | } | |
178 | ||
f4340622 QW |
179 | /* |
180 | * Submit bio from extent page data via submit_one_bio | |
181 | * | |
182 | * Return 0 if everything is OK. | |
183 | * Return <0 for error. | |
184 | */ | |
185 | static int __must_check flush_write_bio(struct extent_page_data *epd) | |
bb58eb9e | 186 | { |
f4340622 | 187 | int ret = 0; |
bb58eb9e | 188 | |
f4340622 | 189 | if (epd->bio) { |
bb58eb9e | 190 | ret = submit_one_bio(epd->bio, 0, 0); |
f4340622 QW |
191 | /* |
192 | * Clean up of epd->bio is handled by its endio function. | |
193 | * And endio is either triggered by successful bio execution | |
194 | * or the error handler of submit bio hook. | |
195 | * So at this point, no matter what happened, we don't need | |
196 | * to clean up epd->bio. | |
197 | */ | |
bb58eb9e QW |
198 | epd->bio = NULL; |
199 | } | |
f4340622 | 200 | return ret; |
bb58eb9e | 201 | } |
e2932ee0 | 202 | |
6f0d04f8 | 203 | int __init extent_state_cache_init(void) |
d1310b2e | 204 | { |
837e1972 | 205 | extent_state_cache = kmem_cache_create("btrfs_extent_state", |
9601e3f6 | 206 | sizeof(struct extent_state), 0, |
fba4b697 | 207 | SLAB_MEM_SPREAD, NULL); |
d1310b2e CM |
208 | if (!extent_state_cache) |
209 | return -ENOMEM; | |
6f0d04f8 JB |
210 | return 0; |
211 | } | |
d1310b2e | 212 | |
6f0d04f8 JB |
213 | int __init extent_io_init(void) |
214 | { | |
837e1972 | 215 | extent_buffer_cache = kmem_cache_create("btrfs_extent_buffer", |
9601e3f6 | 216 | sizeof(struct extent_buffer), 0, |
fba4b697 | 217 | SLAB_MEM_SPREAD, NULL); |
d1310b2e | 218 | if (!extent_buffer_cache) |
6f0d04f8 | 219 | return -ENOMEM; |
9be3395b | 220 | |
8ac9f7c1 KO |
221 | if (bioset_init(&btrfs_bioset, BIO_POOL_SIZE, |
222 | offsetof(struct btrfs_io_bio, bio), | |
223 | BIOSET_NEED_BVECS)) | |
9be3395b | 224 | goto free_buffer_cache; |
b208c2f7 | 225 | |
8ac9f7c1 | 226 | if (bioset_integrity_create(&btrfs_bioset, BIO_POOL_SIZE)) |
b208c2f7 DW |
227 | goto free_bioset; |
228 | ||
d1310b2e CM |
229 | return 0; |
230 | ||
b208c2f7 | 231 | free_bioset: |
8ac9f7c1 | 232 | bioset_exit(&btrfs_bioset); |
b208c2f7 | 233 | |
9be3395b CM |
234 | free_buffer_cache: |
235 | kmem_cache_destroy(extent_buffer_cache); | |
236 | extent_buffer_cache = NULL; | |
6f0d04f8 JB |
237 | return -ENOMEM; |
238 | } | |
9be3395b | 239 | |
6f0d04f8 JB |
240 | void __cold extent_state_cache_exit(void) |
241 | { | |
242 | btrfs_extent_state_leak_debug_check(); | |
d1310b2e | 243 | kmem_cache_destroy(extent_state_cache); |
d1310b2e CM |
244 | } |
245 | ||
e67c718b | 246 | void __cold extent_io_exit(void) |
d1310b2e | 247 | { |
33ca832f | 248 | btrfs_extent_buffer_leak_debug_check(); |
8c0a8537 KS |
249 | |
250 | /* | |
251 | * Make sure all delayed rcu free are flushed before we | |
252 | * destroy caches. | |
253 | */ | |
254 | rcu_barrier(); | |
5598e900 | 255 | kmem_cache_destroy(extent_buffer_cache); |
8ac9f7c1 | 256 | bioset_exit(&btrfs_bioset); |
d1310b2e CM |
257 | } |
258 | ||
41a2ee75 JB |
259 | /* |
260 | * For the file_extent_tree, we want to hold the inode lock when we lookup and | |
261 | * update the disk_i_size, but lockdep will complain because our io_tree we hold | |
262 | * the tree lock and get the inode lock when setting delalloc. These two things | |
263 | * are unrelated, so make a class for the file_extent_tree so we don't get the | |
264 | * two locking patterns mixed up. | |
265 | */ | |
266 | static struct lock_class_key file_extent_tree_class; | |
267 | ||
c258d6e3 | 268 | void extent_io_tree_init(struct btrfs_fs_info *fs_info, |
43eb5f29 QW |
269 | struct extent_io_tree *tree, unsigned int owner, |
270 | void *private_data) | |
d1310b2e | 271 | { |
c258d6e3 | 272 | tree->fs_info = fs_info; |
6bef4d31 | 273 | tree->state = RB_ROOT; |
d1310b2e CM |
274 | tree->ops = NULL; |
275 | tree->dirty_bytes = 0; | |
70dec807 | 276 | spin_lock_init(&tree->lock); |
c6100a4b | 277 | tree->private_data = private_data; |
43eb5f29 | 278 | tree->owner = owner; |
41a2ee75 JB |
279 | if (owner == IO_TREE_INODE_FILE_EXTENT) |
280 | lockdep_set_class(&tree->lock, &file_extent_tree_class); | |
d1310b2e | 281 | } |
d1310b2e | 282 | |
41e7acd3 NB |
283 | void extent_io_tree_release(struct extent_io_tree *tree) |
284 | { | |
285 | spin_lock(&tree->lock); | |
286 | /* | |
287 | * Do a single barrier for the waitqueue_active check here, the state | |
288 | * of the waitqueue should not change once extent_io_tree_release is | |
289 | * called. | |
290 | */ | |
291 | smp_mb(); | |
292 | while (!RB_EMPTY_ROOT(&tree->state)) { | |
293 | struct rb_node *node; | |
294 | struct extent_state *state; | |
295 | ||
296 | node = rb_first(&tree->state); | |
297 | state = rb_entry(node, struct extent_state, rb_node); | |
298 | rb_erase(&state->rb_node, &tree->state); | |
299 | RB_CLEAR_NODE(&state->rb_node); | |
300 | /* | |
301 | * btree io trees aren't supposed to have tasks waiting for | |
302 | * changes in the flags of extent states ever. | |
303 | */ | |
304 | ASSERT(!waitqueue_active(&state->wq)); | |
305 | free_extent_state(state); | |
306 | ||
307 | cond_resched_lock(&tree->lock); | |
308 | } | |
309 | spin_unlock(&tree->lock); | |
310 | } | |
311 | ||
b2950863 | 312 | static struct extent_state *alloc_extent_state(gfp_t mask) |
d1310b2e CM |
313 | { |
314 | struct extent_state *state; | |
d1310b2e | 315 | |
3ba7ab22 MH |
316 | /* |
317 | * The given mask might be not appropriate for the slab allocator, | |
318 | * drop the unsupported bits | |
319 | */ | |
320 | mask &= ~(__GFP_DMA32|__GFP_HIGHMEM); | |
d1310b2e | 321 | state = kmem_cache_alloc(extent_state_cache, mask); |
2b114d1d | 322 | if (!state) |
d1310b2e CM |
323 | return state; |
324 | state->state = 0; | |
47dc196a | 325 | state->failrec = NULL; |
27a3507d | 326 | RB_CLEAR_NODE(&state->rb_node); |
6d49ba1b | 327 | btrfs_leak_debug_add(&state->leak_list, &states); |
b7ac31b7 | 328 | refcount_set(&state->refs, 1); |
d1310b2e | 329 | init_waitqueue_head(&state->wq); |
143bede5 | 330 | trace_alloc_extent_state(state, mask, _RET_IP_); |
d1310b2e CM |
331 | return state; |
332 | } | |
d1310b2e | 333 | |
4845e44f | 334 | void free_extent_state(struct extent_state *state) |
d1310b2e | 335 | { |
d1310b2e CM |
336 | if (!state) |
337 | return; | |
b7ac31b7 | 338 | if (refcount_dec_and_test(&state->refs)) { |
27a3507d | 339 | WARN_ON(extent_state_in_tree(state)); |
6d49ba1b | 340 | btrfs_leak_debug_del(&state->leak_list); |
143bede5 | 341 | trace_free_extent_state(state, _RET_IP_); |
d1310b2e CM |
342 | kmem_cache_free(extent_state_cache, state); |
343 | } | |
344 | } | |
d1310b2e | 345 | |
f2071b21 FM |
346 | static struct rb_node *tree_insert(struct rb_root *root, |
347 | struct rb_node *search_start, | |
348 | u64 offset, | |
12cfbad9 FDBM |
349 | struct rb_node *node, |
350 | struct rb_node ***p_in, | |
351 | struct rb_node **parent_in) | |
d1310b2e | 352 | { |
f2071b21 | 353 | struct rb_node **p; |
d397712b | 354 | struct rb_node *parent = NULL; |
d1310b2e CM |
355 | struct tree_entry *entry; |
356 | ||
12cfbad9 FDBM |
357 | if (p_in && parent_in) { |
358 | p = *p_in; | |
359 | parent = *parent_in; | |
360 | goto do_insert; | |
361 | } | |
362 | ||
f2071b21 | 363 | p = search_start ? &search_start : &root->rb_node; |
d397712b | 364 | while (*p) { |
d1310b2e CM |
365 | parent = *p; |
366 | entry = rb_entry(parent, struct tree_entry, rb_node); | |
367 | ||
368 | if (offset < entry->start) | |
369 | p = &(*p)->rb_left; | |
370 | else if (offset > entry->end) | |
371 | p = &(*p)->rb_right; | |
372 | else | |
373 | return parent; | |
374 | } | |
375 | ||
12cfbad9 | 376 | do_insert: |
d1310b2e CM |
377 | rb_link_node(node, parent, p); |
378 | rb_insert_color(node, root); | |
379 | return NULL; | |
380 | } | |
381 | ||
8666e638 NB |
382 | /** |
383 | * __etree_search - searche @tree for an entry that contains @offset. Such | |
384 | * entry would have entry->start <= offset && entry->end >= offset. | |
385 | * | |
386 | * @tree - the tree to search | |
387 | * @offset - offset that should fall within an entry in @tree | |
388 | * @next_ret - pointer to the first entry whose range ends after @offset | |
389 | * @prev - pointer to the first entry whose range begins before @offset | |
390 | * @p_ret - pointer where new node should be anchored (used when inserting an | |
391 | * entry in the tree) | |
392 | * @parent_ret - points to entry which would have been the parent of the entry, | |
393 | * containing @offset | |
394 | * | |
395 | * This function returns a pointer to the entry that contains @offset byte | |
396 | * address. If no such entry exists, then NULL is returned and the other | |
397 | * pointer arguments to the function are filled, otherwise the found entry is | |
398 | * returned and other pointers are left untouched. | |
399 | */ | |
80ea96b1 | 400 | static struct rb_node *__etree_search(struct extent_io_tree *tree, u64 offset, |
12cfbad9 | 401 | struct rb_node **next_ret, |
352646c7 | 402 | struct rb_node **prev_ret, |
12cfbad9 FDBM |
403 | struct rb_node ***p_ret, |
404 | struct rb_node **parent_ret) | |
d1310b2e | 405 | { |
80ea96b1 | 406 | struct rb_root *root = &tree->state; |
12cfbad9 | 407 | struct rb_node **n = &root->rb_node; |
d1310b2e CM |
408 | struct rb_node *prev = NULL; |
409 | struct rb_node *orig_prev = NULL; | |
410 | struct tree_entry *entry; | |
411 | struct tree_entry *prev_entry = NULL; | |
412 | ||
12cfbad9 FDBM |
413 | while (*n) { |
414 | prev = *n; | |
415 | entry = rb_entry(prev, struct tree_entry, rb_node); | |
d1310b2e CM |
416 | prev_entry = entry; |
417 | ||
418 | if (offset < entry->start) | |
12cfbad9 | 419 | n = &(*n)->rb_left; |
d1310b2e | 420 | else if (offset > entry->end) |
12cfbad9 | 421 | n = &(*n)->rb_right; |
d397712b | 422 | else |
12cfbad9 | 423 | return *n; |
d1310b2e CM |
424 | } |
425 | ||
12cfbad9 FDBM |
426 | if (p_ret) |
427 | *p_ret = n; | |
428 | if (parent_ret) | |
429 | *parent_ret = prev; | |
430 | ||
352646c7 | 431 | if (next_ret) { |
d1310b2e | 432 | orig_prev = prev; |
d397712b | 433 | while (prev && offset > prev_entry->end) { |
d1310b2e CM |
434 | prev = rb_next(prev); |
435 | prev_entry = rb_entry(prev, struct tree_entry, rb_node); | |
436 | } | |
352646c7 | 437 | *next_ret = prev; |
d1310b2e CM |
438 | prev = orig_prev; |
439 | } | |
440 | ||
352646c7 | 441 | if (prev_ret) { |
d1310b2e | 442 | prev_entry = rb_entry(prev, struct tree_entry, rb_node); |
d397712b | 443 | while (prev && offset < prev_entry->start) { |
d1310b2e CM |
444 | prev = rb_prev(prev); |
445 | prev_entry = rb_entry(prev, struct tree_entry, rb_node); | |
446 | } | |
352646c7 | 447 | *prev_ret = prev; |
d1310b2e CM |
448 | } |
449 | return NULL; | |
450 | } | |
451 | ||
12cfbad9 FDBM |
452 | static inline struct rb_node * |
453 | tree_search_for_insert(struct extent_io_tree *tree, | |
454 | u64 offset, | |
455 | struct rb_node ***p_ret, | |
456 | struct rb_node **parent_ret) | |
d1310b2e | 457 | { |
352646c7 | 458 | struct rb_node *next= NULL; |
d1310b2e | 459 | struct rb_node *ret; |
70dec807 | 460 | |
352646c7 | 461 | ret = __etree_search(tree, offset, &next, NULL, p_ret, parent_ret); |
d397712b | 462 | if (!ret) |
352646c7 | 463 | return next; |
d1310b2e CM |
464 | return ret; |
465 | } | |
466 | ||
12cfbad9 FDBM |
467 | static inline struct rb_node *tree_search(struct extent_io_tree *tree, |
468 | u64 offset) | |
469 | { | |
470 | return tree_search_for_insert(tree, offset, NULL, NULL); | |
471 | } | |
472 | ||
d1310b2e CM |
473 | /* |
474 | * utility function to look for merge candidates inside a given range. | |
475 | * Any extents with matching state are merged together into a single | |
476 | * extent in the tree. Extents with EXTENT_IO in their state field | |
477 | * are not merged because the end_io handlers need to be able to do | |
478 | * operations on them without sleeping (or doing allocations/splits). | |
479 | * | |
480 | * This should be called with the tree lock held. | |
481 | */ | |
1bf85046 JM |
482 | static void merge_state(struct extent_io_tree *tree, |
483 | struct extent_state *state) | |
d1310b2e CM |
484 | { |
485 | struct extent_state *other; | |
486 | struct rb_node *other_node; | |
487 | ||
8882679e | 488 | if (state->state & (EXTENT_LOCKED | EXTENT_BOUNDARY)) |
1bf85046 | 489 | return; |
d1310b2e CM |
490 | |
491 | other_node = rb_prev(&state->rb_node); | |
492 | if (other_node) { | |
493 | other = rb_entry(other_node, struct extent_state, rb_node); | |
494 | if (other->end == state->start - 1 && | |
495 | other->state == state->state) { | |
5c848198 NB |
496 | if (tree->private_data && |
497 | is_data_inode(tree->private_data)) | |
498 | btrfs_merge_delalloc_extent(tree->private_data, | |
499 | state, other); | |
d1310b2e | 500 | state->start = other->start; |
d1310b2e | 501 | rb_erase(&other->rb_node, &tree->state); |
27a3507d | 502 | RB_CLEAR_NODE(&other->rb_node); |
d1310b2e CM |
503 | free_extent_state(other); |
504 | } | |
505 | } | |
506 | other_node = rb_next(&state->rb_node); | |
507 | if (other_node) { | |
508 | other = rb_entry(other_node, struct extent_state, rb_node); | |
509 | if (other->start == state->end + 1 && | |
510 | other->state == state->state) { | |
5c848198 NB |
511 | if (tree->private_data && |
512 | is_data_inode(tree->private_data)) | |
513 | btrfs_merge_delalloc_extent(tree->private_data, | |
514 | state, other); | |
df98b6e2 | 515 | state->end = other->end; |
df98b6e2 | 516 | rb_erase(&other->rb_node, &tree->state); |
27a3507d | 517 | RB_CLEAR_NODE(&other->rb_node); |
df98b6e2 | 518 | free_extent_state(other); |
d1310b2e CM |
519 | } |
520 | } | |
d1310b2e CM |
521 | } |
522 | ||
3150b699 | 523 | static void set_state_bits(struct extent_io_tree *tree, |
d38ed27f QW |
524 | struct extent_state *state, unsigned *bits, |
525 | struct extent_changeset *changeset); | |
3150b699 | 526 | |
d1310b2e CM |
527 | /* |
528 | * insert an extent_state struct into the tree. 'bits' are set on the | |
529 | * struct before it is inserted. | |
530 | * | |
531 | * This may return -EEXIST if the extent is already there, in which case the | |
532 | * state struct is freed. | |
533 | * | |
534 | * The tree lock is not taken internally. This is a utility function and | |
535 | * probably isn't what you want to call (see set/clear_extent_bit). | |
536 | */ | |
537 | static int insert_state(struct extent_io_tree *tree, | |
538 | struct extent_state *state, u64 start, u64 end, | |
12cfbad9 FDBM |
539 | struct rb_node ***p, |
540 | struct rb_node **parent, | |
d38ed27f | 541 | unsigned *bits, struct extent_changeset *changeset) |
d1310b2e CM |
542 | { |
543 | struct rb_node *node; | |
544 | ||
2792237d DS |
545 | if (end < start) { |
546 | btrfs_err(tree->fs_info, | |
547 | "insert state: end < start %llu %llu", end, start); | |
548 | WARN_ON(1); | |
549 | } | |
d1310b2e CM |
550 | state->start = start; |
551 | state->end = end; | |
9ed74f2d | 552 | |
d38ed27f | 553 | set_state_bits(tree, state, bits, changeset); |
3150b699 | 554 | |
f2071b21 | 555 | node = tree_insert(&tree->state, NULL, end, &state->rb_node, p, parent); |
d1310b2e CM |
556 | if (node) { |
557 | struct extent_state *found; | |
558 | found = rb_entry(node, struct extent_state, rb_node); | |
2792237d DS |
559 | btrfs_err(tree->fs_info, |
560 | "found node %llu %llu on insert of %llu %llu", | |
c1c9ff7c | 561 | found->start, found->end, start, end); |
d1310b2e CM |
562 | return -EEXIST; |
563 | } | |
564 | merge_state(tree, state); | |
565 | return 0; | |
566 | } | |
567 | ||
568 | /* | |
569 | * split a given extent state struct in two, inserting the preallocated | |
570 | * struct 'prealloc' as the newly created second half. 'split' indicates an | |
571 | * offset inside 'orig' where it should be split. | |
572 | * | |
573 | * Before calling, | |
574 | * the tree has 'orig' at [orig->start, orig->end]. After calling, there | |
575 | * are two extent state structs in the tree: | |
576 | * prealloc: [orig->start, split - 1] | |
577 | * orig: [ split, orig->end ] | |
578 | * | |
579 | * The tree locks are not taken by this function. They need to be held | |
580 | * by the caller. | |
581 | */ | |
582 | static int split_state(struct extent_io_tree *tree, struct extent_state *orig, | |
583 | struct extent_state *prealloc, u64 split) | |
584 | { | |
585 | struct rb_node *node; | |
9ed74f2d | 586 | |
abbb55f4 NB |
587 | if (tree->private_data && is_data_inode(tree->private_data)) |
588 | btrfs_split_delalloc_extent(tree->private_data, orig, split); | |
9ed74f2d | 589 | |
d1310b2e CM |
590 | prealloc->start = orig->start; |
591 | prealloc->end = split - 1; | |
592 | prealloc->state = orig->state; | |
593 | orig->start = split; | |
594 | ||
f2071b21 FM |
595 | node = tree_insert(&tree->state, &orig->rb_node, prealloc->end, |
596 | &prealloc->rb_node, NULL, NULL); | |
d1310b2e | 597 | if (node) { |
d1310b2e CM |
598 | free_extent_state(prealloc); |
599 | return -EEXIST; | |
600 | } | |
601 | return 0; | |
602 | } | |
603 | ||
cdc6a395 LZ |
604 | static struct extent_state *next_state(struct extent_state *state) |
605 | { | |
606 | struct rb_node *next = rb_next(&state->rb_node); | |
607 | if (next) | |
608 | return rb_entry(next, struct extent_state, rb_node); | |
609 | else | |
610 | return NULL; | |
611 | } | |
612 | ||
d1310b2e CM |
613 | /* |
614 | * utility function to clear some bits in an extent state struct. | |
52042d8e | 615 | * it will optionally wake up anyone waiting on this state (wake == 1). |
d1310b2e CM |
616 | * |
617 | * If no bits are set on the state struct after clearing things, the | |
618 | * struct is freed and removed from the tree | |
619 | */ | |
cdc6a395 LZ |
620 | static struct extent_state *clear_state_bit(struct extent_io_tree *tree, |
621 | struct extent_state *state, | |
fefdc557 QW |
622 | unsigned *bits, int wake, |
623 | struct extent_changeset *changeset) | |
d1310b2e | 624 | { |
cdc6a395 | 625 | struct extent_state *next; |
9ee49a04 | 626 | unsigned bits_to_clear = *bits & ~EXTENT_CTLBITS; |
57599c7e | 627 | int ret; |
d1310b2e | 628 | |
0ca1f7ce | 629 | if ((bits_to_clear & EXTENT_DIRTY) && (state->state & EXTENT_DIRTY)) { |
d1310b2e CM |
630 | u64 range = state->end - state->start + 1; |
631 | WARN_ON(range > tree->dirty_bytes); | |
632 | tree->dirty_bytes -= range; | |
633 | } | |
a36bb5f9 NB |
634 | |
635 | if (tree->private_data && is_data_inode(tree->private_data)) | |
636 | btrfs_clear_delalloc_extent(tree->private_data, state, bits); | |
637 | ||
57599c7e DS |
638 | ret = add_extent_changeset(state, bits_to_clear, changeset, 0); |
639 | BUG_ON(ret < 0); | |
32c00aff | 640 | state->state &= ~bits_to_clear; |
d1310b2e CM |
641 | if (wake) |
642 | wake_up(&state->wq); | |
0ca1f7ce | 643 | if (state->state == 0) { |
cdc6a395 | 644 | next = next_state(state); |
27a3507d | 645 | if (extent_state_in_tree(state)) { |
d1310b2e | 646 | rb_erase(&state->rb_node, &tree->state); |
27a3507d | 647 | RB_CLEAR_NODE(&state->rb_node); |
d1310b2e CM |
648 | free_extent_state(state); |
649 | } else { | |
650 | WARN_ON(1); | |
651 | } | |
652 | } else { | |
653 | merge_state(tree, state); | |
cdc6a395 | 654 | next = next_state(state); |
d1310b2e | 655 | } |
cdc6a395 | 656 | return next; |
d1310b2e CM |
657 | } |
658 | ||
8233767a XG |
659 | static struct extent_state * |
660 | alloc_extent_state_atomic(struct extent_state *prealloc) | |
661 | { | |
662 | if (!prealloc) | |
663 | prealloc = alloc_extent_state(GFP_ATOMIC); | |
664 | ||
665 | return prealloc; | |
666 | } | |
667 | ||
48a3b636 | 668 | static void extent_io_tree_panic(struct extent_io_tree *tree, int err) |
c2d904e0 | 669 | { |
05912a3c DS |
670 | struct inode *inode = tree->private_data; |
671 | ||
672 | btrfs_panic(btrfs_sb(inode->i_sb), err, | |
673 | "locking error: extent tree was modified by another thread while locked"); | |
c2d904e0 JM |
674 | } |
675 | ||
d1310b2e CM |
676 | /* |
677 | * clear some bits on a range in the tree. This may require splitting | |
678 | * or inserting elements in the tree, so the gfp mask is used to | |
679 | * indicate which allocations or sleeping are allowed. | |
680 | * | |
681 | * pass 'wake' == 1 to kick any sleepers, and 'delete' == 1 to remove | |
682 | * the given range from the tree regardless of state (ie for truncate). | |
683 | * | |
684 | * the range [start, end] is inclusive. | |
685 | * | |
6763af84 | 686 | * This takes the tree lock, and returns 0 on success and < 0 on error. |
d1310b2e | 687 | */ |
66b0c887 | 688 | int __clear_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, |
fefdc557 QW |
689 | unsigned bits, int wake, int delete, |
690 | struct extent_state **cached_state, | |
691 | gfp_t mask, struct extent_changeset *changeset) | |
d1310b2e CM |
692 | { |
693 | struct extent_state *state; | |
2c64c53d | 694 | struct extent_state *cached; |
d1310b2e CM |
695 | struct extent_state *prealloc = NULL; |
696 | struct rb_node *node; | |
5c939df5 | 697 | u64 last_end; |
d1310b2e | 698 | int err; |
2ac55d41 | 699 | int clear = 0; |
d1310b2e | 700 | |
a5dee37d | 701 | btrfs_debug_check_extent_io_range(tree, start, end); |
a1d19847 | 702 | trace_btrfs_clear_extent_bit(tree, start, end - start + 1, bits); |
8d599ae1 | 703 | |
7ee9e440 JB |
704 | if (bits & EXTENT_DELALLOC) |
705 | bits |= EXTENT_NORESERVE; | |
706 | ||
0ca1f7ce YZ |
707 | if (delete) |
708 | bits |= ~EXTENT_CTLBITS; | |
0ca1f7ce | 709 | |
8882679e | 710 | if (bits & (EXTENT_LOCKED | EXTENT_BOUNDARY)) |
2ac55d41 | 711 | clear = 1; |
d1310b2e | 712 | again: |
d0164adc | 713 | if (!prealloc && gfpflags_allow_blocking(mask)) { |
c7bc6319 FM |
714 | /* |
715 | * Don't care for allocation failure here because we might end | |
716 | * up not needing the pre-allocated extent state at all, which | |
717 | * is the case if we only have in the tree extent states that | |
718 | * cover our input range and don't cover too any other range. | |
719 | * If we end up needing a new extent state we allocate it later. | |
720 | */ | |
d1310b2e | 721 | prealloc = alloc_extent_state(mask); |
d1310b2e CM |
722 | } |
723 | ||
cad321ad | 724 | spin_lock(&tree->lock); |
2c64c53d CM |
725 | if (cached_state) { |
726 | cached = *cached_state; | |
2ac55d41 JB |
727 | |
728 | if (clear) { | |
729 | *cached_state = NULL; | |
730 | cached_state = NULL; | |
731 | } | |
732 | ||
27a3507d FM |
733 | if (cached && extent_state_in_tree(cached) && |
734 | cached->start <= start && cached->end > start) { | |
2ac55d41 | 735 | if (clear) |
b7ac31b7 | 736 | refcount_dec(&cached->refs); |
2c64c53d | 737 | state = cached; |
42daec29 | 738 | goto hit_next; |
2c64c53d | 739 | } |
2ac55d41 JB |
740 | if (clear) |
741 | free_extent_state(cached); | |
2c64c53d | 742 | } |
d1310b2e CM |
743 | /* |
744 | * this search will find the extents that end after | |
745 | * our range starts | |
746 | */ | |
80ea96b1 | 747 | node = tree_search(tree, start); |
d1310b2e CM |
748 | if (!node) |
749 | goto out; | |
750 | state = rb_entry(node, struct extent_state, rb_node); | |
2c64c53d | 751 | hit_next: |
d1310b2e CM |
752 | if (state->start > end) |
753 | goto out; | |
754 | WARN_ON(state->end < start); | |
5c939df5 | 755 | last_end = state->end; |
d1310b2e | 756 | |
0449314a | 757 | /* the state doesn't have the wanted bits, go ahead */ |
cdc6a395 LZ |
758 | if (!(state->state & bits)) { |
759 | state = next_state(state); | |
0449314a | 760 | goto next; |
cdc6a395 | 761 | } |
0449314a | 762 | |
d1310b2e CM |
763 | /* |
764 | * | ---- desired range ---- | | |
765 | * | state | or | |
766 | * | ------------- state -------------- | | |
767 | * | |
768 | * We need to split the extent we found, and may flip | |
769 | * bits on second half. | |
770 | * | |
771 | * If the extent we found extends past our range, we | |
772 | * just split and search again. It'll get split again | |
773 | * the next time though. | |
774 | * | |
775 | * If the extent we found is inside our range, we clear | |
776 | * the desired bit on it. | |
777 | */ | |
778 | ||
779 | if (state->start < start) { | |
8233767a XG |
780 | prealloc = alloc_extent_state_atomic(prealloc); |
781 | BUG_ON(!prealloc); | |
d1310b2e | 782 | err = split_state(tree, state, prealloc, start); |
c2d904e0 JM |
783 | if (err) |
784 | extent_io_tree_panic(tree, err); | |
785 | ||
d1310b2e CM |
786 | prealloc = NULL; |
787 | if (err) | |
788 | goto out; | |
789 | if (state->end <= end) { | |
fefdc557 QW |
790 | state = clear_state_bit(tree, state, &bits, wake, |
791 | changeset); | |
d1ac6e41 | 792 | goto next; |
d1310b2e CM |
793 | } |
794 | goto search_again; | |
795 | } | |
796 | /* | |
797 | * | ---- desired range ---- | | |
798 | * | state | | |
799 | * We need to split the extent, and clear the bit | |
800 | * on the first half | |
801 | */ | |
802 | if (state->start <= end && state->end > end) { | |
8233767a XG |
803 | prealloc = alloc_extent_state_atomic(prealloc); |
804 | BUG_ON(!prealloc); | |
d1310b2e | 805 | err = split_state(tree, state, prealloc, end + 1); |
c2d904e0 JM |
806 | if (err) |
807 | extent_io_tree_panic(tree, err); | |
808 | ||
d1310b2e CM |
809 | if (wake) |
810 | wake_up(&state->wq); | |
42daec29 | 811 | |
fefdc557 | 812 | clear_state_bit(tree, prealloc, &bits, wake, changeset); |
9ed74f2d | 813 | |
d1310b2e CM |
814 | prealloc = NULL; |
815 | goto out; | |
816 | } | |
42daec29 | 817 | |
fefdc557 | 818 | state = clear_state_bit(tree, state, &bits, wake, changeset); |
0449314a | 819 | next: |
5c939df5 YZ |
820 | if (last_end == (u64)-1) |
821 | goto out; | |
822 | start = last_end + 1; | |
cdc6a395 | 823 | if (start <= end && state && !need_resched()) |
692e5759 | 824 | goto hit_next; |
d1310b2e CM |
825 | |
826 | search_again: | |
827 | if (start > end) | |
828 | goto out; | |
cad321ad | 829 | spin_unlock(&tree->lock); |
d0164adc | 830 | if (gfpflags_allow_blocking(mask)) |
d1310b2e CM |
831 | cond_resched(); |
832 | goto again; | |
7ab5cb2a DS |
833 | |
834 | out: | |
835 | spin_unlock(&tree->lock); | |
836 | if (prealloc) | |
837 | free_extent_state(prealloc); | |
838 | ||
839 | return 0; | |
840 | ||
d1310b2e | 841 | } |
d1310b2e | 842 | |
143bede5 JM |
843 | static void wait_on_state(struct extent_io_tree *tree, |
844 | struct extent_state *state) | |
641f5219 CH |
845 | __releases(tree->lock) |
846 | __acquires(tree->lock) | |
d1310b2e CM |
847 | { |
848 | DEFINE_WAIT(wait); | |
849 | prepare_to_wait(&state->wq, &wait, TASK_UNINTERRUPTIBLE); | |
cad321ad | 850 | spin_unlock(&tree->lock); |
d1310b2e | 851 | schedule(); |
cad321ad | 852 | spin_lock(&tree->lock); |
d1310b2e | 853 | finish_wait(&state->wq, &wait); |
d1310b2e CM |
854 | } |
855 | ||
856 | /* | |
857 | * waits for one or more bits to clear on a range in the state tree. | |
858 | * The range [start, end] is inclusive. | |
859 | * The tree lock is taken by this function | |
860 | */ | |
41074888 DS |
861 | static void wait_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, |
862 | unsigned long bits) | |
d1310b2e CM |
863 | { |
864 | struct extent_state *state; | |
865 | struct rb_node *node; | |
866 | ||
a5dee37d | 867 | btrfs_debug_check_extent_io_range(tree, start, end); |
8d599ae1 | 868 | |
cad321ad | 869 | spin_lock(&tree->lock); |
d1310b2e CM |
870 | again: |
871 | while (1) { | |
872 | /* | |
873 | * this search will find all the extents that end after | |
874 | * our range starts | |
875 | */ | |
80ea96b1 | 876 | node = tree_search(tree, start); |
c50d3e71 | 877 | process_node: |
d1310b2e CM |
878 | if (!node) |
879 | break; | |
880 | ||
881 | state = rb_entry(node, struct extent_state, rb_node); | |
882 | ||
883 | if (state->start > end) | |
884 | goto out; | |
885 | ||
886 | if (state->state & bits) { | |
887 | start = state->start; | |
b7ac31b7 | 888 | refcount_inc(&state->refs); |
d1310b2e CM |
889 | wait_on_state(tree, state); |
890 | free_extent_state(state); | |
891 | goto again; | |
892 | } | |
893 | start = state->end + 1; | |
894 | ||
895 | if (start > end) | |
896 | break; | |
897 | ||
c50d3e71 FM |
898 | if (!cond_resched_lock(&tree->lock)) { |
899 | node = rb_next(node); | |
900 | goto process_node; | |
901 | } | |
d1310b2e CM |
902 | } |
903 | out: | |
cad321ad | 904 | spin_unlock(&tree->lock); |
d1310b2e | 905 | } |
d1310b2e | 906 | |
1bf85046 | 907 | static void set_state_bits(struct extent_io_tree *tree, |
d1310b2e | 908 | struct extent_state *state, |
d38ed27f | 909 | unsigned *bits, struct extent_changeset *changeset) |
d1310b2e | 910 | { |
9ee49a04 | 911 | unsigned bits_to_set = *bits & ~EXTENT_CTLBITS; |
57599c7e | 912 | int ret; |
9ed74f2d | 913 | |
e06a1fc9 NB |
914 | if (tree->private_data && is_data_inode(tree->private_data)) |
915 | btrfs_set_delalloc_extent(tree->private_data, state, bits); | |
916 | ||
0ca1f7ce | 917 | if ((bits_to_set & EXTENT_DIRTY) && !(state->state & EXTENT_DIRTY)) { |
d1310b2e CM |
918 | u64 range = state->end - state->start + 1; |
919 | tree->dirty_bytes += range; | |
920 | } | |
57599c7e DS |
921 | ret = add_extent_changeset(state, bits_to_set, changeset, 1); |
922 | BUG_ON(ret < 0); | |
0ca1f7ce | 923 | state->state |= bits_to_set; |
d1310b2e CM |
924 | } |
925 | ||
e38e2ed7 FM |
926 | static void cache_state_if_flags(struct extent_state *state, |
927 | struct extent_state **cached_ptr, | |
9ee49a04 | 928 | unsigned flags) |
2c64c53d CM |
929 | { |
930 | if (cached_ptr && !(*cached_ptr)) { | |
e38e2ed7 | 931 | if (!flags || (state->state & flags)) { |
2c64c53d | 932 | *cached_ptr = state; |
b7ac31b7 | 933 | refcount_inc(&state->refs); |
2c64c53d CM |
934 | } |
935 | } | |
936 | } | |
937 | ||
e38e2ed7 FM |
938 | static void cache_state(struct extent_state *state, |
939 | struct extent_state **cached_ptr) | |
940 | { | |
941 | return cache_state_if_flags(state, cached_ptr, | |
8882679e | 942 | EXTENT_LOCKED | EXTENT_BOUNDARY); |
e38e2ed7 FM |
943 | } |
944 | ||
d1310b2e | 945 | /* |
1edbb734 CM |
946 | * set some bits on a range in the tree. This may require allocations or |
947 | * sleeping, so the gfp mask is used to indicate what is allowed. | |
d1310b2e | 948 | * |
1edbb734 CM |
949 | * If any of the exclusive bits are set, this will fail with -EEXIST if some |
950 | * part of the range already has the desired bits set. The start of the | |
951 | * existing range is returned in failed_start in this case. | |
d1310b2e | 952 | * |
1edbb734 | 953 | * [start, end] is inclusive This takes the tree lock. |
d1310b2e | 954 | */ |
1edbb734 | 955 | |
3fbe5c02 JM |
956 | static int __must_check |
957 | __set_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, | |
9ee49a04 | 958 | unsigned bits, unsigned exclusive_bits, |
41074888 | 959 | u64 *failed_start, struct extent_state **cached_state, |
d38ed27f | 960 | gfp_t mask, struct extent_changeset *changeset) |
d1310b2e CM |
961 | { |
962 | struct extent_state *state; | |
963 | struct extent_state *prealloc = NULL; | |
964 | struct rb_node *node; | |
12cfbad9 FDBM |
965 | struct rb_node **p; |
966 | struct rb_node *parent; | |
d1310b2e | 967 | int err = 0; |
d1310b2e CM |
968 | u64 last_start; |
969 | u64 last_end; | |
42daec29 | 970 | |
a5dee37d | 971 | btrfs_debug_check_extent_io_range(tree, start, end); |
a1d19847 | 972 | trace_btrfs_set_extent_bit(tree, start, end - start + 1, bits); |
8d599ae1 | 973 | |
d1310b2e | 974 | again: |
d0164adc | 975 | if (!prealloc && gfpflags_allow_blocking(mask)) { |
059f791c DS |
976 | /* |
977 | * Don't care for allocation failure here because we might end | |
978 | * up not needing the pre-allocated extent state at all, which | |
979 | * is the case if we only have in the tree extent states that | |
980 | * cover our input range and don't cover too any other range. | |
981 | * If we end up needing a new extent state we allocate it later. | |
982 | */ | |
d1310b2e | 983 | prealloc = alloc_extent_state(mask); |
d1310b2e CM |
984 | } |
985 | ||
cad321ad | 986 | spin_lock(&tree->lock); |
9655d298 CM |
987 | if (cached_state && *cached_state) { |
988 | state = *cached_state; | |
df98b6e2 | 989 | if (state->start <= start && state->end > start && |
27a3507d | 990 | extent_state_in_tree(state)) { |
9655d298 CM |
991 | node = &state->rb_node; |
992 | goto hit_next; | |
993 | } | |
994 | } | |
d1310b2e CM |
995 | /* |
996 | * this search will find all the extents that end after | |
997 | * our range starts. | |
998 | */ | |
12cfbad9 | 999 | node = tree_search_for_insert(tree, start, &p, &parent); |
d1310b2e | 1000 | if (!node) { |
8233767a XG |
1001 | prealloc = alloc_extent_state_atomic(prealloc); |
1002 | BUG_ON(!prealloc); | |
12cfbad9 | 1003 | err = insert_state(tree, prealloc, start, end, |
d38ed27f | 1004 | &p, &parent, &bits, changeset); |
c2d904e0 JM |
1005 | if (err) |
1006 | extent_io_tree_panic(tree, err); | |
1007 | ||
c42ac0bc | 1008 | cache_state(prealloc, cached_state); |
d1310b2e | 1009 | prealloc = NULL; |
d1310b2e CM |
1010 | goto out; |
1011 | } | |
d1310b2e | 1012 | state = rb_entry(node, struct extent_state, rb_node); |
40431d6c | 1013 | hit_next: |
d1310b2e CM |
1014 | last_start = state->start; |
1015 | last_end = state->end; | |
1016 | ||
1017 | /* | |
1018 | * | ---- desired range ---- | | |
1019 | * | state | | |
1020 | * | |
1021 | * Just lock what we found and keep going | |
1022 | */ | |
1023 | if (state->start == start && state->end <= end) { | |
1edbb734 | 1024 | if (state->state & exclusive_bits) { |
d1310b2e CM |
1025 | *failed_start = state->start; |
1026 | err = -EEXIST; | |
1027 | goto out; | |
1028 | } | |
42daec29 | 1029 | |
d38ed27f | 1030 | set_state_bits(tree, state, &bits, changeset); |
2c64c53d | 1031 | cache_state(state, cached_state); |
d1310b2e | 1032 | merge_state(tree, state); |
5c939df5 YZ |
1033 | if (last_end == (u64)-1) |
1034 | goto out; | |
1035 | start = last_end + 1; | |
d1ac6e41 LB |
1036 | state = next_state(state); |
1037 | if (start < end && state && state->start == start && | |
1038 | !need_resched()) | |
1039 | goto hit_next; | |
d1310b2e CM |
1040 | goto search_again; |
1041 | } | |
1042 | ||
1043 | /* | |
1044 | * | ---- desired range ---- | | |
1045 | * | state | | |
1046 | * or | |
1047 | * | ------------- state -------------- | | |
1048 | * | |
1049 | * We need to split the extent we found, and may flip bits on | |
1050 | * second half. | |
1051 | * | |
1052 | * If the extent we found extends past our | |
1053 | * range, we just split and search again. It'll get split | |
1054 | * again the next time though. | |
1055 | * | |
1056 | * If the extent we found is inside our range, we set the | |
1057 | * desired bit on it. | |
1058 | */ | |
1059 | if (state->start < start) { | |
1edbb734 | 1060 | if (state->state & exclusive_bits) { |
d1310b2e CM |
1061 | *failed_start = start; |
1062 | err = -EEXIST; | |
1063 | goto out; | |
1064 | } | |
8233767a XG |
1065 | |
1066 | prealloc = alloc_extent_state_atomic(prealloc); | |
1067 | BUG_ON(!prealloc); | |
d1310b2e | 1068 | err = split_state(tree, state, prealloc, start); |
c2d904e0 JM |
1069 | if (err) |
1070 | extent_io_tree_panic(tree, err); | |
1071 | ||
d1310b2e CM |
1072 | prealloc = NULL; |
1073 | if (err) | |
1074 | goto out; | |
1075 | if (state->end <= end) { | |
d38ed27f | 1076 | set_state_bits(tree, state, &bits, changeset); |
2c64c53d | 1077 | cache_state(state, cached_state); |
d1310b2e | 1078 | merge_state(tree, state); |
5c939df5 YZ |
1079 | if (last_end == (u64)-1) |
1080 | goto out; | |
1081 | start = last_end + 1; | |
d1ac6e41 LB |
1082 | state = next_state(state); |
1083 | if (start < end && state && state->start == start && | |
1084 | !need_resched()) | |
1085 | goto hit_next; | |
d1310b2e CM |
1086 | } |
1087 | goto search_again; | |
1088 | } | |
1089 | /* | |
1090 | * | ---- desired range ---- | | |
1091 | * | state | or | state | | |
1092 | * | |
1093 | * There's a hole, we need to insert something in it and | |
1094 | * ignore the extent we found. | |
1095 | */ | |
1096 | if (state->start > start) { | |
1097 | u64 this_end; | |
1098 | if (end < last_start) | |
1099 | this_end = end; | |
1100 | else | |
d397712b | 1101 | this_end = last_start - 1; |
8233767a XG |
1102 | |
1103 | prealloc = alloc_extent_state_atomic(prealloc); | |
1104 | BUG_ON(!prealloc); | |
c7f895a2 XG |
1105 | |
1106 | /* | |
1107 | * Avoid to free 'prealloc' if it can be merged with | |
1108 | * the later extent. | |
1109 | */ | |
d1310b2e | 1110 | err = insert_state(tree, prealloc, start, this_end, |
d38ed27f | 1111 | NULL, NULL, &bits, changeset); |
c2d904e0 JM |
1112 | if (err) |
1113 | extent_io_tree_panic(tree, err); | |
1114 | ||
9ed74f2d JB |
1115 | cache_state(prealloc, cached_state); |
1116 | prealloc = NULL; | |
d1310b2e CM |
1117 | start = this_end + 1; |
1118 | goto search_again; | |
1119 | } | |
1120 | /* | |
1121 | * | ---- desired range ---- | | |
1122 | * | state | | |
1123 | * We need to split the extent, and set the bit | |
1124 | * on the first half | |
1125 | */ | |
1126 | if (state->start <= end && state->end > end) { | |
1edbb734 | 1127 | if (state->state & exclusive_bits) { |
d1310b2e CM |
1128 | *failed_start = start; |
1129 | err = -EEXIST; | |
1130 | goto out; | |
1131 | } | |
8233767a XG |
1132 | |
1133 | prealloc = alloc_extent_state_atomic(prealloc); | |
1134 | BUG_ON(!prealloc); | |
d1310b2e | 1135 | err = split_state(tree, state, prealloc, end + 1); |
c2d904e0 JM |
1136 | if (err) |
1137 | extent_io_tree_panic(tree, err); | |
d1310b2e | 1138 | |
d38ed27f | 1139 | set_state_bits(tree, prealloc, &bits, changeset); |
2c64c53d | 1140 | cache_state(prealloc, cached_state); |
d1310b2e CM |
1141 | merge_state(tree, prealloc); |
1142 | prealloc = NULL; | |
1143 | goto out; | |
1144 | } | |
1145 | ||
b5a4ba14 DS |
1146 | search_again: |
1147 | if (start > end) | |
1148 | goto out; | |
1149 | spin_unlock(&tree->lock); | |
1150 | if (gfpflags_allow_blocking(mask)) | |
1151 | cond_resched(); | |
1152 | goto again; | |
d1310b2e CM |
1153 | |
1154 | out: | |
cad321ad | 1155 | spin_unlock(&tree->lock); |
d1310b2e CM |
1156 | if (prealloc) |
1157 | free_extent_state(prealloc); | |
1158 | ||
1159 | return err; | |
1160 | ||
d1310b2e | 1161 | } |
d1310b2e | 1162 | |
41074888 | 1163 | int set_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, |
9ee49a04 | 1164 | unsigned bits, u64 * failed_start, |
41074888 | 1165 | struct extent_state **cached_state, gfp_t mask) |
3fbe5c02 JM |
1166 | { |
1167 | return __set_extent_bit(tree, start, end, bits, 0, failed_start, | |
d38ed27f | 1168 | cached_state, mask, NULL); |
3fbe5c02 JM |
1169 | } |
1170 | ||
1171 | ||
462d6fac | 1172 | /** |
10983f2e LB |
1173 | * convert_extent_bit - convert all bits in a given range from one bit to |
1174 | * another | |
462d6fac JB |
1175 | * @tree: the io tree to search |
1176 | * @start: the start offset in bytes | |
1177 | * @end: the end offset in bytes (inclusive) | |
1178 | * @bits: the bits to set in this range | |
1179 | * @clear_bits: the bits to clear in this range | |
e6138876 | 1180 | * @cached_state: state that we're going to cache |
462d6fac JB |
1181 | * |
1182 | * This will go through and set bits for the given range. If any states exist | |
1183 | * already in this range they are set with the given bit and cleared of the | |
1184 | * clear_bits. This is only meant to be used by things that are mergeable, ie | |
1185 | * converting from say DELALLOC to DIRTY. This is not meant to be used with | |
1186 | * boundary bits like LOCK. | |
210aa277 DS |
1187 | * |
1188 | * All allocations are done with GFP_NOFS. | |
462d6fac JB |
1189 | */ |
1190 | int convert_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, | |
9ee49a04 | 1191 | unsigned bits, unsigned clear_bits, |
210aa277 | 1192 | struct extent_state **cached_state) |
462d6fac JB |
1193 | { |
1194 | struct extent_state *state; | |
1195 | struct extent_state *prealloc = NULL; | |
1196 | struct rb_node *node; | |
12cfbad9 FDBM |
1197 | struct rb_node **p; |
1198 | struct rb_node *parent; | |
462d6fac JB |
1199 | int err = 0; |
1200 | u64 last_start; | |
1201 | u64 last_end; | |
c8fd3de7 | 1202 | bool first_iteration = true; |
462d6fac | 1203 | |
a5dee37d | 1204 | btrfs_debug_check_extent_io_range(tree, start, end); |
a1d19847 QW |
1205 | trace_btrfs_convert_extent_bit(tree, start, end - start + 1, bits, |
1206 | clear_bits); | |
8d599ae1 | 1207 | |
462d6fac | 1208 | again: |
210aa277 | 1209 | if (!prealloc) { |
c8fd3de7 FM |
1210 | /* |
1211 | * Best effort, don't worry if extent state allocation fails | |
1212 | * here for the first iteration. We might have a cached state | |
1213 | * that matches exactly the target range, in which case no | |
1214 | * extent state allocations are needed. We'll only know this | |
1215 | * after locking the tree. | |
1216 | */ | |
210aa277 | 1217 | prealloc = alloc_extent_state(GFP_NOFS); |
c8fd3de7 | 1218 | if (!prealloc && !first_iteration) |
462d6fac JB |
1219 | return -ENOMEM; |
1220 | } | |
1221 | ||
1222 | spin_lock(&tree->lock); | |
e6138876 JB |
1223 | if (cached_state && *cached_state) { |
1224 | state = *cached_state; | |
1225 | if (state->start <= start && state->end > start && | |
27a3507d | 1226 | extent_state_in_tree(state)) { |
e6138876 JB |
1227 | node = &state->rb_node; |
1228 | goto hit_next; | |
1229 | } | |
1230 | } | |
1231 | ||
462d6fac JB |
1232 | /* |
1233 | * this search will find all the extents that end after | |
1234 | * our range starts. | |
1235 | */ | |
12cfbad9 | 1236 | node = tree_search_for_insert(tree, start, &p, &parent); |
462d6fac JB |
1237 | if (!node) { |
1238 | prealloc = alloc_extent_state_atomic(prealloc); | |
1cf4ffdb LB |
1239 | if (!prealloc) { |
1240 | err = -ENOMEM; | |
1241 | goto out; | |
1242 | } | |
12cfbad9 | 1243 | err = insert_state(tree, prealloc, start, end, |
d38ed27f | 1244 | &p, &parent, &bits, NULL); |
c2d904e0 JM |
1245 | if (err) |
1246 | extent_io_tree_panic(tree, err); | |
c42ac0bc FDBM |
1247 | cache_state(prealloc, cached_state); |
1248 | prealloc = NULL; | |
462d6fac JB |
1249 | goto out; |
1250 | } | |
1251 | state = rb_entry(node, struct extent_state, rb_node); | |
1252 | hit_next: | |
1253 | last_start = state->start; | |
1254 | last_end = state->end; | |
1255 | ||
1256 | /* | |
1257 | * | ---- desired range ---- | | |
1258 | * | state | | |
1259 | * | |
1260 | * Just lock what we found and keep going | |
1261 | */ | |
1262 | if (state->start == start && state->end <= end) { | |
d38ed27f | 1263 | set_state_bits(tree, state, &bits, NULL); |
e6138876 | 1264 | cache_state(state, cached_state); |
fefdc557 | 1265 | state = clear_state_bit(tree, state, &clear_bits, 0, NULL); |
462d6fac JB |
1266 | if (last_end == (u64)-1) |
1267 | goto out; | |
462d6fac | 1268 | start = last_end + 1; |
d1ac6e41 LB |
1269 | if (start < end && state && state->start == start && |
1270 | !need_resched()) | |
1271 | goto hit_next; | |
462d6fac JB |
1272 | goto search_again; |
1273 | } | |
1274 | ||
1275 | /* | |
1276 | * | ---- desired range ---- | | |
1277 | * | state | | |
1278 | * or | |
1279 | * | ------------- state -------------- | | |
1280 | * | |
1281 | * We need to split the extent we found, and may flip bits on | |
1282 | * second half. | |
1283 | * | |
1284 | * If the extent we found extends past our | |
1285 | * range, we just split and search again. It'll get split | |
1286 | * again the next time though. | |
1287 | * | |
1288 | * If the extent we found is inside our range, we set the | |
1289 | * desired bit on it. | |
1290 | */ | |
1291 | if (state->start < start) { | |
1292 | prealloc = alloc_extent_state_atomic(prealloc); | |
1cf4ffdb LB |
1293 | if (!prealloc) { |
1294 | err = -ENOMEM; | |
1295 | goto out; | |
1296 | } | |
462d6fac | 1297 | err = split_state(tree, state, prealloc, start); |
c2d904e0 JM |
1298 | if (err) |
1299 | extent_io_tree_panic(tree, err); | |
462d6fac JB |
1300 | prealloc = NULL; |
1301 | if (err) | |
1302 | goto out; | |
1303 | if (state->end <= end) { | |
d38ed27f | 1304 | set_state_bits(tree, state, &bits, NULL); |
e6138876 | 1305 | cache_state(state, cached_state); |
fefdc557 QW |
1306 | state = clear_state_bit(tree, state, &clear_bits, 0, |
1307 | NULL); | |
462d6fac JB |
1308 | if (last_end == (u64)-1) |
1309 | goto out; | |
1310 | start = last_end + 1; | |
d1ac6e41 LB |
1311 | if (start < end && state && state->start == start && |
1312 | !need_resched()) | |
1313 | goto hit_next; | |
462d6fac JB |
1314 | } |
1315 | goto search_again; | |
1316 | } | |
1317 | /* | |
1318 | * | ---- desired range ---- | | |
1319 | * | state | or | state | | |
1320 | * | |
1321 | * There's a hole, we need to insert something in it and | |
1322 | * ignore the extent we found. | |
1323 | */ | |
1324 | if (state->start > start) { | |
1325 | u64 this_end; | |
1326 | if (end < last_start) | |
1327 | this_end = end; | |
1328 | else | |
1329 | this_end = last_start - 1; | |
1330 | ||
1331 | prealloc = alloc_extent_state_atomic(prealloc); | |
1cf4ffdb LB |
1332 | if (!prealloc) { |
1333 | err = -ENOMEM; | |
1334 | goto out; | |
1335 | } | |
462d6fac JB |
1336 | |
1337 | /* | |
1338 | * Avoid to free 'prealloc' if it can be merged with | |
1339 | * the later extent. | |
1340 | */ | |
1341 | err = insert_state(tree, prealloc, start, this_end, | |
d38ed27f | 1342 | NULL, NULL, &bits, NULL); |
c2d904e0 JM |
1343 | if (err) |
1344 | extent_io_tree_panic(tree, err); | |
e6138876 | 1345 | cache_state(prealloc, cached_state); |
462d6fac JB |
1346 | prealloc = NULL; |
1347 | start = this_end + 1; | |
1348 | goto search_again; | |
1349 | } | |
1350 | /* | |
1351 | * | ---- desired range ---- | | |
1352 | * | state | | |
1353 | * We need to split the extent, and set the bit | |
1354 | * on the first half | |
1355 | */ | |
1356 | if (state->start <= end && state->end > end) { | |
1357 | prealloc = alloc_extent_state_atomic(prealloc); | |
1cf4ffdb LB |
1358 | if (!prealloc) { |
1359 | err = -ENOMEM; | |
1360 | goto out; | |
1361 | } | |
462d6fac JB |
1362 | |
1363 | err = split_state(tree, state, prealloc, end + 1); | |
c2d904e0 JM |
1364 | if (err) |
1365 | extent_io_tree_panic(tree, err); | |
462d6fac | 1366 | |
d38ed27f | 1367 | set_state_bits(tree, prealloc, &bits, NULL); |
e6138876 | 1368 | cache_state(prealloc, cached_state); |
fefdc557 | 1369 | clear_state_bit(tree, prealloc, &clear_bits, 0, NULL); |
462d6fac JB |
1370 | prealloc = NULL; |
1371 | goto out; | |
1372 | } | |
1373 | ||
462d6fac JB |
1374 | search_again: |
1375 | if (start > end) | |
1376 | goto out; | |
1377 | spin_unlock(&tree->lock); | |
210aa277 | 1378 | cond_resched(); |
c8fd3de7 | 1379 | first_iteration = false; |
462d6fac | 1380 | goto again; |
462d6fac JB |
1381 | |
1382 | out: | |
1383 | spin_unlock(&tree->lock); | |
1384 | if (prealloc) | |
1385 | free_extent_state(prealloc); | |
1386 | ||
1387 | return err; | |
462d6fac JB |
1388 | } |
1389 | ||
d1310b2e | 1390 | /* wrappers around set/clear extent bit */ |
d38ed27f | 1391 | int set_record_extent_bits(struct extent_io_tree *tree, u64 start, u64 end, |
2c53b912 | 1392 | unsigned bits, struct extent_changeset *changeset) |
d38ed27f QW |
1393 | { |
1394 | /* | |
1395 | * We don't support EXTENT_LOCKED yet, as current changeset will | |
1396 | * record any bits changed, so for EXTENT_LOCKED case, it will | |
1397 | * either fail with -EEXIST or changeset will record the whole | |
1398 | * range. | |
1399 | */ | |
1400 | BUG_ON(bits & EXTENT_LOCKED); | |
1401 | ||
2c53b912 | 1402 | return __set_extent_bit(tree, start, end, bits, 0, NULL, NULL, GFP_NOFS, |
d38ed27f QW |
1403 | changeset); |
1404 | } | |
1405 | ||
4ca73656 NB |
1406 | int set_extent_bits_nowait(struct extent_io_tree *tree, u64 start, u64 end, |
1407 | unsigned bits) | |
1408 | { | |
1409 | return __set_extent_bit(tree, start, end, bits, 0, NULL, NULL, | |
1410 | GFP_NOWAIT, NULL); | |
1411 | } | |
1412 | ||
fefdc557 QW |
1413 | int clear_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, |
1414 | unsigned bits, int wake, int delete, | |
ae0f1625 | 1415 | struct extent_state **cached) |
fefdc557 QW |
1416 | { |
1417 | return __clear_extent_bit(tree, start, end, bits, wake, delete, | |
ae0f1625 | 1418 | cached, GFP_NOFS, NULL); |
fefdc557 QW |
1419 | } |
1420 | ||
fefdc557 | 1421 | int clear_record_extent_bits(struct extent_io_tree *tree, u64 start, u64 end, |
f734c44a | 1422 | unsigned bits, struct extent_changeset *changeset) |
fefdc557 QW |
1423 | { |
1424 | /* | |
1425 | * Don't support EXTENT_LOCKED case, same reason as | |
1426 | * set_record_extent_bits(). | |
1427 | */ | |
1428 | BUG_ON(bits & EXTENT_LOCKED); | |
1429 | ||
f734c44a | 1430 | return __clear_extent_bit(tree, start, end, bits, 0, 0, NULL, GFP_NOFS, |
fefdc557 QW |
1431 | changeset); |
1432 | } | |
1433 | ||
d352ac68 CM |
1434 | /* |
1435 | * either insert or lock state struct between start and end use mask to tell | |
1436 | * us if waiting is desired. | |
1437 | */ | |
1edbb734 | 1438 | int lock_extent_bits(struct extent_io_tree *tree, u64 start, u64 end, |
ff13db41 | 1439 | struct extent_state **cached_state) |
d1310b2e CM |
1440 | { |
1441 | int err; | |
1442 | u64 failed_start; | |
9ee49a04 | 1443 | |
d1310b2e | 1444 | while (1) { |
ff13db41 | 1445 | err = __set_extent_bit(tree, start, end, EXTENT_LOCKED, |
3fbe5c02 | 1446 | EXTENT_LOCKED, &failed_start, |
d38ed27f | 1447 | cached_state, GFP_NOFS, NULL); |
d0082371 | 1448 | if (err == -EEXIST) { |
d1310b2e CM |
1449 | wait_extent_bit(tree, failed_start, end, EXTENT_LOCKED); |
1450 | start = failed_start; | |
d0082371 | 1451 | } else |
d1310b2e | 1452 | break; |
d1310b2e CM |
1453 | WARN_ON(start > end); |
1454 | } | |
1455 | return err; | |
1456 | } | |
d1310b2e | 1457 | |
d0082371 | 1458 | int try_lock_extent(struct extent_io_tree *tree, u64 start, u64 end) |
25179201 JB |
1459 | { |
1460 | int err; | |
1461 | u64 failed_start; | |
1462 | ||
3fbe5c02 | 1463 | err = __set_extent_bit(tree, start, end, EXTENT_LOCKED, EXTENT_LOCKED, |
d38ed27f | 1464 | &failed_start, NULL, GFP_NOFS, NULL); |
6643558d YZ |
1465 | if (err == -EEXIST) { |
1466 | if (failed_start > start) | |
1467 | clear_extent_bit(tree, start, failed_start - 1, | |
ae0f1625 | 1468 | EXTENT_LOCKED, 1, 0, NULL); |
25179201 | 1469 | return 0; |
6643558d | 1470 | } |
25179201 JB |
1471 | return 1; |
1472 | } | |
25179201 | 1473 | |
bd1fa4f0 | 1474 | void extent_range_clear_dirty_for_io(struct inode *inode, u64 start, u64 end) |
4adaa611 | 1475 | { |
09cbfeaf KS |
1476 | unsigned long index = start >> PAGE_SHIFT; |
1477 | unsigned long end_index = end >> PAGE_SHIFT; | |
4adaa611 CM |
1478 | struct page *page; |
1479 | ||
1480 | while (index <= end_index) { | |
1481 | page = find_get_page(inode->i_mapping, index); | |
1482 | BUG_ON(!page); /* Pages should be in the extent_io_tree */ | |
1483 | clear_page_dirty_for_io(page); | |
09cbfeaf | 1484 | put_page(page); |
4adaa611 CM |
1485 | index++; |
1486 | } | |
4adaa611 CM |
1487 | } |
1488 | ||
f6311572 | 1489 | void extent_range_redirty_for_io(struct inode *inode, u64 start, u64 end) |
4adaa611 | 1490 | { |
09cbfeaf KS |
1491 | unsigned long index = start >> PAGE_SHIFT; |
1492 | unsigned long end_index = end >> PAGE_SHIFT; | |
4adaa611 CM |
1493 | struct page *page; |
1494 | ||
1495 | while (index <= end_index) { | |
1496 | page = find_get_page(inode->i_mapping, index); | |
1497 | BUG_ON(!page); /* Pages should be in the extent_io_tree */ | |
4adaa611 | 1498 | __set_page_dirty_nobuffers(page); |
8d38633c | 1499 | account_page_redirty(page); |
09cbfeaf | 1500 | put_page(page); |
4adaa611 CM |
1501 | index++; |
1502 | } | |
4adaa611 CM |
1503 | } |
1504 | ||
d352ac68 CM |
1505 | /* find the first state struct with 'bits' set after 'start', and |
1506 | * return it. tree->lock must be held. NULL will returned if | |
1507 | * nothing was found after 'start' | |
1508 | */ | |
48a3b636 ES |
1509 | static struct extent_state * |
1510 | find_first_extent_bit_state(struct extent_io_tree *tree, | |
9ee49a04 | 1511 | u64 start, unsigned bits) |
d7fc640e CM |
1512 | { |
1513 | struct rb_node *node; | |
1514 | struct extent_state *state; | |
1515 | ||
1516 | /* | |
1517 | * this search will find all the extents that end after | |
1518 | * our range starts. | |
1519 | */ | |
1520 | node = tree_search(tree, start); | |
d397712b | 1521 | if (!node) |
d7fc640e | 1522 | goto out; |
d7fc640e | 1523 | |
d397712b | 1524 | while (1) { |
d7fc640e | 1525 | state = rb_entry(node, struct extent_state, rb_node); |
d397712b | 1526 | if (state->end >= start && (state->state & bits)) |
d7fc640e | 1527 | return state; |
d397712b | 1528 | |
d7fc640e CM |
1529 | node = rb_next(node); |
1530 | if (!node) | |
1531 | break; | |
1532 | } | |
1533 | out: | |
1534 | return NULL; | |
1535 | } | |
d7fc640e | 1536 | |
69261c4b XG |
1537 | /* |
1538 | * find the first offset in the io tree with 'bits' set. zero is | |
1539 | * returned if we find something, and *start_ret and *end_ret are | |
1540 | * set to reflect the state struct that was found. | |
1541 | * | |
477d7eaf | 1542 | * If nothing was found, 1 is returned. If found something, return 0. |
69261c4b XG |
1543 | */ |
1544 | int find_first_extent_bit(struct extent_io_tree *tree, u64 start, | |
9ee49a04 | 1545 | u64 *start_ret, u64 *end_ret, unsigned bits, |
e6138876 | 1546 | struct extent_state **cached_state) |
69261c4b XG |
1547 | { |
1548 | struct extent_state *state; | |
1549 | int ret = 1; | |
1550 | ||
1551 | spin_lock(&tree->lock); | |
e6138876 JB |
1552 | if (cached_state && *cached_state) { |
1553 | state = *cached_state; | |
27a3507d | 1554 | if (state->end == start - 1 && extent_state_in_tree(state)) { |
9688e9a9 | 1555 | while ((state = next_state(state)) != NULL) { |
e6138876 JB |
1556 | if (state->state & bits) |
1557 | goto got_it; | |
e6138876 JB |
1558 | } |
1559 | free_extent_state(*cached_state); | |
1560 | *cached_state = NULL; | |
1561 | goto out; | |
1562 | } | |
1563 | free_extent_state(*cached_state); | |
1564 | *cached_state = NULL; | |
1565 | } | |
1566 | ||
69261c4b | 1567 | state = find_first_extent_bit_state(tree, start, bits); |
e6138876 | 1568 | got_it: |
69261c4b | 1569 | if (state) { |
e38e2ed7 | 1570 | cache_state_if_flags(state, cached_state, 0); |
69261c4b XG |
1571 | *start_ret = state->start; |
1572 | *end_ret = state->end; | |
1573 | ret = 0; | |
1574 | } | |
e6138876 | 1575 | out: |
69261c4b XG |
1576 | spin_unlock(&tree->lock); |
1577 | return ret; | |
1578 | } | |
1579 | ||
41a2ee75 JB |
1580 | /** |
1581 | * find_contiguous_extent_bit: find a contiguous area of bits | |
1582 | * @tree - io tree to check | |
1583 | * @start - offset to start the search from | |
1584 | * @start_ret - the first offset we found with the bits set | |
1585 | * @end_ret - the final contiguous range of the bits that were set | |
1586 | * @bits - bits to look for | |
1587 | * | |
1588 | * set_extent_bit and clear_extent_bit can temporarily split contiguous ranges | |
1589 | * to set bits appropriately, and then merge them again. During this time it | |
1590 | * will drop the tree->lock, so use this helper if you want to find the actual | |
1591 | * contiguous area for given bits. We will search to the first bit we find, and | |
1592 | * then walk down the tree until we find a non-contiguous area. The area | |
1593 | * returned will be the full contiguous area with the bits set. | |
1594 | */ | |
1595 | int find_contiguous_extent_bit(struct extent_io_tree *tree, u64 start, | |
1596 | u64 *start_ret, u64 *end_ret, unsigned bits) | |
1597 | { | |
1598 | struct extent_state *state; | |
1599 | int ret = 1; | |
1600 | ||
1601 | spin_lock(&tree->lock); | |
1602 | state = find_first_extent_bit_state(tree, start, bits); | |
1603 | if (state) { | |
1604 | *start_ret = state->start; | |
1605 | *end_ret = state->end; | |
1606 | while ((state = next_state(state)) != NULL) { | |
1607 | if (state->start > (*end_ret + 1)) | |
1608 | break; | |
1609 | *end_ret = state->end; | |
1610 | } | |
1611 | ret = 0; | |
1612 | } | |
1613 | spin_unlock(&tree->lock); | |
1614 | return ret; | |
1615 | } | |
1616 | ||
45bfcfc1 | 1617 | /** |
1eaebb34 NB |
1618 | * find_first_clear_extent_bit - find the first range that has @bits not set. |
1619 | * This range could start before @start. | |
45bfcfc1 NB |
1620 | * |
1621 | * @tree - the tree to search | |
1622 | * @start - the offset at/after which the found extent should start | |
1623 | * @start_ret - records the beginning of the range | |
1624 | * @end_ret - records the end of the range (inclusive) | |
1625 | * @bits - the set of bits which must be unset | |
1626 | * | |
1627 | * Since unallocated range is also considered one which doesn't have the bits | |
1628 | * set it's possible that @end_ret contains -1, this happens in case the range | |
1629 | * spans (last_range_end, end of device]. In this case it's up to the caller to | |
1630 | * trim @end_ret to the appropriate size. | |
1631 | */ | |
1632 | void find_first_clear_extent_bit(struct extent_io_tree *tree, u64 start, | |
1633 | u64 *start_ret, u64 *end_ret, unsigned bits) | |
1634 | { | |
1635 | struct extent_state *state; | |
1636 | struct rb_node *node, *prev = NULL, *next; | |
1637 | ||
1638 | spin_lock(&tree->lock); | |
1639 | ||
1640 | /* Find first extent with bits cleared */ | |
1641 | while (1) { | |
1642 | node = __etree_search(tree, start, &next, &prev, NULL, NULL); | |
5750c375 NB |
1643 | if (!node && !next && !prev) { |
1644 | /* | |
1645 | * Tree is completely empty, send full range and let | |
1646 | * caller deal with it | |
1647 | */ | |
1648 | *start_ret = 0; | |
1649 | *end_ret = -1; | |
1650 | goto out; | |
1651 | } else if (!node && !next) { | |
1652 | /* | |
1653 | * We are past the last allocated chunk, set start at | |
1654 | * the end of the last extent. | |
1655 | */ | |
1656 | state = rb_entry(prev, struct extent_state, rb_node); | |
1657 | *start_ret = state->end + 1; | |
1658 | *end_ret = -1; | |
1659 | goto out; | |
1660 | } else if (!node) { | |
45bfcfc1 | 1661 | node = next; |
45bfcfc1 | 1662 | } |
1eaebb34 NB |
1663 | /* |
1664 | * At this point 'node' either contains 'start' or start is | |
1665 | * before 'node' | |
1666 | */ | |
45bfcfc1 | 1667 | state = rb_entry(node, struct extent_state, rb_node); |
1eaebb34 NB |
1668 | |
1669 | if (in_range(start, state->start, state->end - state->start + 1)) { | |
1670 | if (state->state & bits) { | |
1671 | /* | |
1672 | * |--range with bits sets--| | |
1673 | * | | |
1674 | * start | |
1675 | */ | |
1676 | start = state->end + 1; | |
1677 | } else { | |
1678 | /* | |
1679 | * 'start' falls within a range that doesn't | |
1680 | * have the bits set, so take its start as | |
1681 | * the beginning of the desired range | |
1682 | * | |
1683 | * |--range with bits cleared----| | |
1684 | * | | |
1685 | * start | |
1686 | */ | |
1687 | *start_ret = state->start; | |
1688 | break; | |
1689 | } | |
45bfcfc1 | 1690 | } else { |
1eaebb34 NB |
1691 | /* |
1692 | * |---prev range---|---hole/unset---|---node range---| | |
1693 | * | | |
1694 | * start | |
1695 | * | |
1696 | * or | |
1697 | * | |
1698 | * |---hole/unset--||--first node--| | |
1699 | * 0 | | |
1700 | * start | |
1701 | */ | |
1702 | if (prev) { | |
1703 | state = rb_entry(prev, struct extent_state, | |
1704 | rb_node); | |
1705 | *start_ret = state->end + 1; | |
1706 | } else { | |
1707 | *start_ret = 0; | |
1708 | } | |
45bfcfc1 NB |
1709 | break; |
1710 | } | |
1711 | } | |
1712 | ||
1713 | /* | |
1714 | * Find the longest stretch from start until an entry which has the | |
1715 | * bits set | |
1716 | */ | |
1717 | while (1) { | |
1718 | state = rb_entry(node, struct extent_state, rb_node); | |
1719 | if (state->end >= start && !(state->state & bits)) { | |
1720 | *end_ret = state->end; | |
1721 | } else { | |
1722 | *end_ret = state->start - 1; | |
1723 | break; | |
1724 | } | |
1725 | ||
1726 | node = rb_next(node); | |
1727 | if (!node) | |
1728 | break; | |
1729 | } | |
1730 | out: | |
1731 | spin_unlock(&tree->lock); | |
1732 | } | |
1733 | ||
d352ac68 CM |
1734 | /* |
1735 | * find a contiguous range of bytes in the file marked as delalloc, not | |
1736 | * more than 'max_bytes'. start and end are used to return the range, | |
1737 | * | |
3522e903 | 1738 | * true is returned if we find something, false if nothing was in the tree |
d352ac68 | 1739 | */ |
083e75e7 JB |
1740 | bool btrfs_find_delalloc_range(struct extent_io_tree *tree, u64 *start, |
1741 | u64 *end, u64 max_bytes, | |
1742 | struct extent_state **cached_state) | |
d1310b2e CM |
1743 | { |
1744 | struct rb_node *node; | |
1745 | struct extent_state *state; | |
1746 | u64 cur_start = *start; | |
3522e903 | 1747 | bool found = false; |
d1310b2e CM |
1748 | u64 total_bytes = 0; |
1749 | ||
cad321ad | 1750 | spin_lock(&tree->lock); |
c8b97818 | 1751 | |
d1310b2e CM |
1752 | /* |
1753 | * this search will find all the extents that end after | |
1754 | * our range starts. | |
1755 | */ | |
80ea96b1 | 1756 | node = tree_search(tree, cur_start); |
2b114d1d | 1757 | if (!node) { |
3522e903 | 1758 | *end = (u64)-1; |
d1310b2e CM |
1759 | goto out; |
1760 | } | |
1761 | ||
d397712b | 1762 | while (1) { |
d1310b2e | 1763 | state = rb_entry(node, struct extent_state, rb_node); |
5b21f2ed ZY |
1764 | if (found && (state->start != cur_start || |
1765 | (state->state & EXTENT_BOUNDARY))) { | |
d1310b2e CM |
1766 | goto out; |
1767 | } | |
1768 | if (!(state->state & EXTENT_DELALLOC)) { | |
1769 | if (!found) | |
1770 | *end = state->end; | |
1771 | goto out; | |
1772 | } | |
c2a128d2 | 1773 | if (!found) { |
d1310b2e | 1774 | *start = state->start; |
c2a128d2 | 1775 | *cached_state = state; |
b7ac31b7 | 1776 | refcount_inc(&state->refs); |
c2a128d2 | 1777 | } |
3522e903 | 1778 | found = true; |
d1310b2e CM |
1779 | *end = state->end; |
1780 | cur_start = state->end + 1; | |
1781 | node = rb_next(node); | |
d1310b2e | 1782 | total_bytes += state->end - state->start + 1; |
7bf811a5 | 1783 | if (total_bytes >= max_bytes) |
573aecaf | 1784 | break; |
573aecaf | 1785 | if (!node) |
d1310b2e CM |
1786 | break; |
1787 | } | |
1788 | out: | |
cad321ad | 1789 | spin_unlock(&tree->lock); |
d1310b2e CM |
1790 | return found; |
1791 | } | |
1792 | ||
da2c7009 LB |
1793 | static int __process_pages_contig(struct address_space *mapping, |
1794 | struct page *locked_page, | |
1795 | pgoff_t start_index, pgoff_t end_index, | |
1796 | unsigned long page_ops, pgoff_t *index_ret); | |
1797 | ||
143bede5 JM |
1798 | static noinline void __unlock_for_delalloc(struct inode *inode, |
1799 | struct page *locked_page, | |
1800 | u64 start, u64 end) | |
c8b97818 | 1801 | { |
09cbfeaf KS |
1802 | unsigned long index = start >> PAGE_SHIFT; |
1803 | unsigned long end_index = end >> PAGE_SHIFT; | |
c8b97818 | 1804 | |
76c0021d | 1805 | ASSERT(locked_page); |
c8b97818 | 1806 | if (index == locked_page->index && end_index == index) |
143bede5 | 1807 | return; |
c8b97818 | 1808 | |
76c0021d LB |
1809 | __process_pages_contig(inode->i_mapping, locked_page, index, end_index, |
1810 | PAGE_UNLOCK, NULL); | |
c8b97818 CM |
1811 | } |
1812 | ||
1813 | static noinline int lock_delalloc_pages(struct inode *inode, | |
1814 | struct page *locked_page, | |
1815 | u64 delalloc_start, | |
1816 | u64 delalloc_end) | |
1817 | { | |
09cbfeaf | 1818 | unsigned long index = delalloc_start >> PAGE_SHIFT; |
76c0021d | 1819 | unsigned long index_ret = index; |
09cbfeaf | 1820 | unsigned long end_index = delalloc_end >> PAGE_SHIFT; |
c8b97818 | 1821 | int ret; |
c8b97818 | 1822 | |
76c0021d | 1823 | ASSERT(locked_page); |
c8b97818 CM |
1824 | if (index == locked_page->index && index == end_index) |
1825 | return 0; | |
1826 | ||
76c0021d LB |
1827 | ret = __process_pages_contig(inode->i_mapping, locked_page, index, |
1828 | end_index, PAGE_LOCK, &index_ret); | |
1829 | if (ret == -EAGAIN) | |
1830 | __unlock_for_delalloc(inode, locked_page, delalloc_start, | |
1831 | (u64)index_ret << PAGE_SHIFT); | |
c8b97818 CM |
1832 | return ret; |
1833 | } | |
1834 | ||
1835 | /* | |
3522e903 LF |
1836 | * Find and lock a contiguous range of bytes in the file marked as delalloc, no |
1837 | * more than @max_bytes. @Start and @end are used to return the range, | |
c8b97818 | 1838 | * |
3522e903 LF |
1839 | * Return: true if we find something |
1840 | * false if nothing was in the tree | |
c8b97818 | 1841 | */ |
ce9f967f | 1842 | EXPORT_FOR_TESTS |
3522e903 | 1843 | noinline_for_stack bool find_lock_delalloc_range(struct inode *inode, |
294e30fe | 1844 | struct page *locked_page, u64 *start, |
917aacec | 1845 | u64 *end) |
c8b97818 | 1846 | { |
9978059b | 1847 | struct extent_io_tree *tree = &BTRFS_I(inode)->io_tree; |
917aacec | 1848 | u64 max_bytes = BTRFS_MAX_EXTENT_SIZE; |
c8b97818 CM |
1849 | u64 delalloc_start; |
1850 | u64 delalloc_end; | |
3522e903 | 1851 | bool found; |
9655d298 | 1852 | struct extent_state *cached_state = NULL; |
c8b97818 CM |
1853 | int ret; |
1854 | int loops = 0; | |
1855 | ||
1856 | again: | |
1857 | /* step one, find a bunch of delalloc bytes starting at start */ | |
1858 | delalloc_start = *start; | |
1859 | delalloc_end = 0; | |
083e75e7 JB |
1860 | found = btrfs_find_delalloc_range(tree, &delalloc_start, &delalloc_end, |
1861 | max_bytes, &cached_state); | |
70b99e69 | 1862 | if (!found || delalloc_end <= *start) { |
c8b97818 CM |
1863 | *start = delalloc_start; |
1864 | *end = delalloc_end; | |
c2a128d2 | 1865 | free_extent_state(cached_state); |
3522e903 | 1866 | return false; |
c8b97818 CM |
1867 | } |
1868 | ||
70b99e69 CM |
1869 | /* |
1870 | * start comes from the offset of locked_page. We have to lock | |
1871 | * pages in order, so we can't process delalloc bytes before | |
1872 | * locked_page | |
1873 | */ | |
d397712b | 1874 | if (delalloc_start < *start) |
70b99e69 | 1875 | delalloc_start = *start; |
70b99e69 | 1876 | |
c8b97818 CM |
1877 | /* |
1878 | * make sure to limit the number of pages we try to lock down | |
c8b97818 | 1879 | */ |
7bf811a5 JB |
1880 | if (delalloc_end + 1 - delalloc_start > max_bytes) |
1881 | delalloc_end = delalloc_start + max_bytes - 1; | |
d397712b | 1882 | |
c8b97818 CM |
1883 | /* step two, lock all the pages after the page that has start */ |
1884 | ret = lock_delalloc_pages(inode, locked_page, | |
1885 | delalloc_start, delalloc_end); | |
9bfd61d9 | 1886 | ASSERT(!ret || ret == -EAGAIN); |
c8b97818 CM |
1887 | if (ret == -EAGAIN) { |
1888 | /* some of the pages are gone, lets avoid looping by | |
1889 | * shortening the size of the delalloc range we're searching | |
1890 | */ | |
9655d298 | 1891 | free_extent_state(cached_state); |
7d788742 | 1892 | cached_state = NULL; |
c8b97818 | 1893 | if (!loops) { |
09cbfeaf | 1894 | max_bytes = PAGE_SIZE; |
c8b97818 CM |
1895 | loops = 1; |
1896 | goto again; | |
1897 | } else { | |
3522e903 | 1898 | found = false; |
c8b97818 CM |
1899 | goto out_failed; |
1900 | } | |
1901 | } | |
c8b97818 CM |
1902 | |
1903 | /* step three, lock the state bits for the whole range */ | |
ff13db41 | 1904 | lock_extent_bits(tree, delalloc_start, delalloc_end, &cached_state); |
c8b97818 CM |
1905 | |
1906 | /* then test to make sure it is all still delalloc */ | |
1907 | ret = test_range_bit(tree, delalloc_start, delalloc_end, | |
9655d298 | 1908 | EXTENT_DELALLOC, 1, cached_state); |
c8b97818 | 1909 | if (!ret) { |
9655d298 | 1910 | unlock_extent_cached(tree, delalloc_start, delalloc_end, |
e43bbe5e | 1911 | &cached_state); |
c8b97818 CM |
1912 | __unlock_for_delalloc(inode, locked_page, |
1913 | delalloc_start, delalloc_end); | |
1914 | cond_resched(); | |
1915 | goto again; | |
1916 | } | |
9655d298 | 1917 | free_extent_state(cached_state); |
c8b97818 CM |
1918 | *start = delalloc_start; |
1919 | *end = delalloc_end; | |
1920 | out_failed: | |
1921 | return found; | |
1922 | } | |
1923 | ||
da2c7009 LB |
1924 | static int __process_pages_contig(struct address_space *mapping, |
1925 | struct page *locked_page, | |
1926 | pgoff_t start_index, pgoff_t end_index, | |
1927 | unsigned long page_ops, pgoff_t *index_ret) | |
c8b97818 | 1928 | { |
873695b3 | 1929 | unsigned long nr_pages = end_index - start_index + 1; |
da2c7009 | 1930 | unsigned long pages_locked = 0; |
873695b3 | 1931 | pgoff_t index = start_index; |
c8b97818 | 1932 | struct page *pages[16]; |
873695b3 | 1933 | unsigned ret; |
da2c7009 | 1934 | int err = 0; |
c8b97818 | 1935 | int i; |
771ed689 | 1936 | |
da2c7009 LB |
1937 | if (page_ops & PAGE_LOCK) { |
1938 | ASSERT(page_ops == PAGE_LOCK); | |
1939 | ASSERT(index_ret && *index_ret == start_index); | |
1940 | } | |
1941 | ||
704de49d | 1942 | if ((page_ops & PAGE_SET_ERROR) && nr_pages > 0) |
873695b3 | 1943 | mapping_set_error(mapping, -EIO); |
704de49d | 1944 | |
d397712b | 1945 | while (nr_pages > 0) { |
873695b3 | 1946 | ret = find_get_pages_contig(mapping, index, |
5b050f04 CM |
1947 | min_t(unsigned long, |
1948 | nr_pages, ARRAY_SIZE(pages)), pages); | |
da2c7009 LB |
1949 | if (ret == 0) { |
1950 | /* | |
1951 | * Only if we're going to lock these pages, | |
1952 | * can we find nothing at @index. | |
1953 | */ | |
1954 | ASSERT(page_ops & PAGE_LOCK); | |
49d4a334 LB |
1955 | err = -EAGAIN; |
1956 | goto out; | |
da2c7009 | 1957 | } |
8b62b72b | 1958 | |
da2c7009 | 1959 | for (i = 0; i < ret; i++) { |
c2790a2e | 1960 | if (page_ops & PAGE_SET_PRIVATE2) |
8b62b72b CM |
1961 | SetPagePrivate2(pages[i]); |
1962 | ||
1d53c9e6 | 1963 | if (locked_page && pages[i] == locked_page) { |
09cbfeaf | 1964 | put_page(pages[i]); |
da2c7009 | 1965 | pages_locked++; |
c8b97818 CM |
1966 | continue; |
1967 | } | |
c2790a2e | 1968 | if (page_ops & PAGE_CLEAR_DIRTY) |
c8b97818 | 1969 | clear_page_dirty_for_io(pages[i]); |
c2790a2e | 1970 | if (page_ops & PAGE_SET_WRITEBACK) |
c8b97818 | 1971 | set_page_writeback(pages[i]); |
704de49d FM |
1972 | if (page_ops & PAGE_SET_ERROR) |
1973 | SetPageError(pages[i]); | |
c2790a2e | 1974 | if (page_ops & PAGE_END_WRITEBACK) |
c8b97818 | 1975 | end_page_writeback(pages[i]); |
c2790a2e | 1976 | if (page_ops & PAGE_UNLOCK) |
771ed689 | 1977 | unlock_page(pages[i]); |
da2c7009 LB |
1978 | if (page_ops & PAGE_LOCK) { |
1979 | lock_page(pages[i]); | |
1980 | if (!PageDirty(pages[i]) || | |
1981 | pages[i]->mapping != mapping) { | |
1982 | unlock_page(pages[i]); | |
1983 | put_page(pages[i]); | |
1984 | err = -EAGAIN; | |
1985 | goto out; | |
1986 | } | |
1987 | } | |
09cbfeaf | 1988 | put_page(pages[i]); |
da2c7009 | 1989 | pages_locked++; |
c8b97818 CM |
1990 | } |
1991 | nr_pages -= ret; | |
1992 | index += ret; | |
1993 | cond_resched(); | |
1994 | } | |
da2c7009 LB |
1995 | out: |
1996 | if (err && index_ret) | |
1997 | *index_ret = start_index + pages_locked - 1; | |
1998 | return err; | |
c8b97818 | 1999 | } |
c8b97818 | 2000 | |
873695b3 | 2001 | void extent_clear_unlock_delalloc(struct inode *inode, u64 start, u64 end, |
74e9194a NB |
2002 | struct page *locked_page, |
2003 | unsigned clear_bits, | |
2004 | unsigned long page_ops) | |
873695b3 LB |
2005 | { |
2006 | clear_extent_bit(&BTRFS_I(inode)->io_tree, start, end, clear_bits, 1, 0, | |
ae0f1625 | 2007 | NULL); |
873695b3 LB |
2008 | |
2009 | __process_pages_contig(inode->i_mapping, locked_page, | |
2010 | start >> PAGE_SHIFT, end >> PAGE_SHIFT, | |
da2c7009 | 2011 | page_ops, NULL); |
873695b3 LB |
2012 | } |
2013 | ||
d352ac68 CM |
2014 | /* |
2015 | * count the number of bytes in the tree that have a given bit(s) | |
2016 | * set. This can be fairly slow, except for EXTENT_DIRTY which is | |
2017 | * cached. The total number found is returned. | |
2018 | */ | |
d1310b2e CM |
2019 | u64 count_range_bits(struct extent_io_tree *tree, |
2020 | u64 *start, u64 search_end, u64 max_bytes, | |
9ee49a04 | 2021 | unsigned bits, int contig) |
d1310b2e CM |
2022 | { |
2023 | struct rb_node *node; | |
2024 | struct extent_state *state; | |
2025 | u64 cur_start = *start; | |
2026 | u64 total_bytes = 0; | |
ec29ed5b | 2027 | u64 last = 0; |
d1310b2e CM |
2028 | int found = 0; |
2029 | ||
fae7f21c | 2030 | if (WARN_ON(search_end <= cur_start)) |
d1310b2e | 2031 | return 0; |
d1310b2e | 2032 | |
cad321ad | 2033 | spin_lock(&tree->lock); |
d1310b2e CM |
2034 | if (cur_start == 0 && bits == EXTENT_DIRTY) { |
2035 | total_bytes = tree->dirty_bytes; | |
2036 | goto out; | |
2037 | } | |
2038 | /* | |
2039 | * this search will find all the extents that end after | |
2040 | * our range starts. | |
2041 | */ | |
80ea96b1 | 2042 | node = tree_search(tree, cur_start); |
d397712b | 2043 | if (!node) |
d1310b2e | 2044 | goto out; |
d1310b2e | 2045 | |
d397712b | 2046 | while (1) { |
d1310b2e CM |
2047 | state = rb_entry(node, struct extent_state, rb_node); |
2048 | if (state->start > search_end) | |
2049 | break; | |
ec29ed5b CM |
2050 | if (contig && found && state->start > last + 1) |
2051 | break; | |
2052 | if (state->end >= cur_start && (state->state & bits) == bits) { | |
d1310b2e CM |
2053 | total_bytes += min(search_end, state->end) + 1 - |
2054 | max(cur_start, state->start); | |
2055 | if (total_bytes >= max_bytes) | |
2056 | break; | |
2057 | if (!found) { | |
af60bed2 | 2058 | *start = max(cur_start, state->start); |
d1310b2e CM |
2059 | found = 1; |
2060 | } | |
ec29ed5b CM |
2061 | last = state->end; |
2062 | } else if (contig && found) { | |
2063 | break; | |
d1310b2e CM |
2064 | } |
2065 | node = rb_next(node); | |
2066 | if (!node) | |
2067 | break; | |
2068 | } | |
2069 | out: | |
cad321ad | 2070 | spin_unlock(&tree->lock); |
d1310b2e CM |
2071 | return total_bytes; |
2072 | } | |
b2950863 | 2073 | |
d352ac68 CM |
2074 | /* |
2075 | * set the private field for a given byte offset in the tree. If there isn't | |
2076 | * an extent_state there already, this does nothing. | |
2077 | */ | |
b3f167aa JB |
2078 | int set_state_failrec(struct extent_io_tree *tree, u64 start, |
2079 | struct io_failure_record *failrec) | |
d1310b2e CM |
2080 | { |
2081 | struct rb_node *node; | |
2082 | struct extent_state *state; | |
2083 | int ret = 0; | |
2084 | ||
cad321ad | 2085 | spin_lock(&tree->lock); |
d1310b2e CM |
2086 | /* |
2087 | * this search will find all the extents that end after | |
2088 | * our range starts. | |
2089 | */ | |
80ea96b1 | 2090 | node = tree_search(tree, start); |
2b114d1d | 2091 | if (!node) { |
d1310b2e CM |
2092 | ret = -ENOENT; |
2093 | goto out; | |
2094 | } | |
2095 | state = rb_entry(node, struct extent_state, rb_node); | |
2096 | if (state->start != start) { | |
2097 | ret = -ENOENT; | |
2098 | goto out; | |
2099 | } | |
47dc196a | 2100 | state->failrec = failrec; |
d1310b2e | 2101 | out: |
cad321ad | 2102 | spin_unlock(&tree->lock); |
d1310b2e CM |
2103 | return ret; |
2104 | } | |
2105 | ||
b3f167aa JB |
2106 | int get_state_failrec(struct extent_io_tree *tree, u64 start, |
2107 | struct io_failure_record **failrec) | |
d1310b2e CM |
2108 | { |
2109 | struct rb_node *node; | |
2110 | struct extent_state *state; | |
2111 | int ret = 0; | |
2112 | ||
cad321ad | 2113 | spin_lock(&tree->lock); |
d1310b2e CM |
2114 | /* |
2115 | * this search will find all the extents that end after | |
2116 | * our range starts. | |
2117 | */ | |
80ea96b1 | 2118 | node = tree_search(tree, start); |
2b114d1d | 2119 | if (!node) { |
d1310b2e CM |
2120 | ret = -ENOENT; |
2121 | goto out; | |
2122 | } | |
2123 | state = rb_entry(node, struct extent_state, rb_node); | |
2124 | if (state->start != start) { | |
2125 | ret = -ENOENT; | |
2126 | goto out; | |
2127 | } | |
47dc196a | 2128 | *failrec = state->failrec; |
d1310b2e | 2129 | out: |
cad321ad | 2130 | spin_unlock(&tree->lock); |
d1310b2e CM |
2131 | return ret; |
2132 | } | |
2133 | ||
2134 | /* | |
2135 | * searches a range in the state tree for a given mask. | |
70dec807 | 2136 | * If 'filled' == 1, this returns 1 only if every extent in the tree |
d1310b2e CM |
2137 | * has the bits set. Otherwise, 1 is returned if any bit in the |
2138 | * range is found set. | |
2139 | */ | |
2140 | int test_range_bit(struct extent_io_tree *tree, u64 start, u64 end, | |
9ee49a04 | 2141 | unsigned bits, int filled, struct extent_state *cached) |
d1310b2e CM |
2142 | { |
2143 | struct extent_state *state = NULL; | |
2144 | struct rb_node *node; | |
2145 | int bitset = 0; | |
d1310b2e | 2146 | |
cad321ad | 2147 | spin_lock(&tree->lock); |
27a3507d | 2148 | if (cached && extent_state_in_tree(cached) && cached->start <= start && |
df98b6e2 | 2149 | cached->end > start) |
9655d298 CM |
2150 | node = &cached->rb_node; |
2151 | else | |
2152 | node = tree_search(tree, start); | |
d1310b2e CM |
2153 | while (node && start <= end) { |
2154 | state = rb_entry(node, struct extent_state, rb_node); | |
2155 | ||
2156 | if (filled && state->start > start) { | |
2157 | bitset = 0; | |
2158 | break; | |
2159 | } | |
2160 | ||
2161 | if (state->start > end) | |
2162 | break; | |
2163 | ||
2164 | if (state->state & bits) { | |
2165 | bitset = 1; | |
2166 | if (!filled) | |
2167 | break; | |
2168 | } else if (filled) { | |
2169 | bitset = 0; | |
2170 | break; | |
2171 | } | |
46562cec CM |
2172 | |
2173 | if (state->end == (u64)-1) | |
2174 | break; | |
2175 | ||
d1310b2e CM |
2176 | start = state->end + 1; |
2177 | if (start > end) | |
2178 | break; | |
2179 | node = rb_next(node); | |
2180 | if (!node) { | |
2181 | if (filled) | |
2182 | bitset = 0; | |
2183 | break; | |
2184 | } | |
2185 | } | |
cad321ad | 2186 | spin_unlock(&tree->lock); |
d1310b2e CM |
2187 | return bitset; |
2188 | } | |
d1310b2e CM |
2189 | |
2190 | /* | |
2191 | * helper function to set a given page up to date if all the | |
2192 | * extents in the tree for that page are up to date | |
2193 | */ | |
143bede5 | 2194 | static void check_page_uptodate(struct extent_io_tree *tree, struct page *page) |
d1310b2e | 2195 | { |
4eee4fa4 | 2196 | u64 start = page_offset(page); |
09cbfeaf | 2197 | u64 end = start + PAGE_SIZE - 1; |
9655d298 | 2198 | if (test_range_bit(tree, start, end, EXTENT_UPTODATE, 1, NULL)) |
d1310b2e | 2199 | SetPageUptodate(page); |
d1310b2e CM |
2200 | } |
2201 | ||
7870d082 JB |
2202 | int free_io_failure(struct extent_io_tree *failure_tree, |
2203 | struct extent_io_tree *io_tree, | |
2204 | struct io_failure_record *rec) | |
4a54c8c1 JS |
2205 | { |
2206 | int ret; | |
2207 | int err = 0; | |
4a54c8c1 | 2208 | |
47dc196a | 2209 | set_state_failrec(failure_tree, rec->start, NULL); |
4a54c8c1 JS |
2210 | ret = clear_extent_bits(failure_tree, rec->start, |
2211 | rec->start + rec->len - 1, | |
91166212 | 2212 | EXTENT_LOCKED | EXTENT_DIRTY); |
4a54c8c1 JS |
2213 | if (ret) |
2214 | err = ret; | |
2215 | ||
7870d082 | 2216 | ret = clear_extent_bits(io_tree, rec->start, |
53b381b3 | 2217 | rec->start + rec->len - 1, |
91166212 | 2218 | EXTENT_DAMAGED); |
53b381b3 DW |
2219 | if (ret && !err) |
2220 | err = ret; | |
4a54c8c1 JS |
2221 | |
2222 | kfree(rec); | |
2223 | return err; | |
2224 | } | |
2225 | ||
4a54c8c1 JS |
2226 | /* |
2227 | * this bypasses the standard btrfs submit functions deliberately, as | |
2228 | * the standard behavior is to write all copies in a raid setup. here we only | |
2229 | * want to write the one bad copy. so we do the mapping for ourselves and issue | |
2230 | * submit_bio directly. | |
3ec706c8 | 2231 | * to avoid any synchronization issues, wait for the data after writing, which |
4a54c8c1 JS |
2232 | * actually prevents the read that triggered the error from finishing. |
2233 | * currently, there can be no more than two copies of every data bit. thus, | |
2234 | * exactly one rewrite is required. | |
2235 | */ | |
6ec656bc JB |
2236 | int repair_io_failure(struct btrfs_fs_info *fs_info, u64 ino, u64 start, |
2237 | u64 length, u64 logical, struct page *page, | |
2238 | unsigned int pg_offset, int mirror_num) | |
4a54c8c1 JS |
2239 | { |
2240 | struct bio *bio; | |
2241 | struct btrfs_device *dev; | |
4a54c8c1 JS |
2242 | u64 map_length = 0; |
2243 | u64 sector; | |
2244 | struct btrfs_bio *bbio = NULL; | |
2245 | int ret; | |
2246 | ||
1751e8a6 | 2247 | ASSERT(!(fs_info->sb->s_flags & SB_RDONLY)); |
4a54c8c1 JS |
2248 | BUG_ON(!mirror_num); |
2249 | ||
c5e4c3d7 | 2250 | bio = btrfs_io_bio_alloc(1); |
4f024f37 | 2251 | bio->bi_iter.bi_size = 0; |
4a54c8c1 JS |
2252 | map_length = length; |
2253 | ||
b5de8d0d FM |
2254 | /* |
2255 | * Avoid races with device replace and make sure our bbio has devices | |
2256 | * associated to its stripes that don't go away while we are doing the | |
2257 | * read repair operation. | |
2258 | */ | |
2259 | btrfs_bio_counter_inc_blocked(fs_info); | |
e4ff5fb5 | 2260 | if (btrfs_is_parity_mirror(fs_info, logical, length)) { |
c725328c LB |
2261 | /* |
2262 | * Note that we don't use BTRFS_MAP_WRITE because it's supposed | |
2263 | * to update all raid stripes, but here we just want to correct | |
2264 | * bad stripe, thus BTRFS_MAP_READ is abused to only get the bad | |
2265 | * stripe's dev and sector. | |
2266 | */ | |
2267 | ret = btrfs_map_block(fs_info, BTRFS_MAP_READ, logical, | |
2268 | &map_length, &bbio, 0); | |
2269 | if (ret) { | |
2270 | btrfs_bio_counter_dec(fs_info); | |
2271 | bio_put(bio); | |
2272 | return -EIO; | |
2273 | } | |
2274 | ASSERT(bbio->mirror_num == 1); | |
2275 | } else { | |
2276 | ret = btrfs_map_block(fs_info, BTRFS_MAP_WRITE, logical, | |
2277 | &map_length, &bbio, mirror_num); | |
2278 | if (ret) { | |
2279 | btrfs_bio_counter_dec(fs_info); | |
2280 | bio_put(bio); | |
2281 | return -EIO; | |
2282 | } | |
2283 | BUG_ON(mirror_num != bbio->mirror_num); | |
4a54c8c1 | 2284 | } |
c725328c LB |
2285 | |
2286 | sector = bbio->stripes[bbio->mirror_num - 1].physical >> 9; | |
4f024f37 | 2287 | bio->bi_iter.bi_sector = sector; |
c725328c | 2288 | dev = bbio->stripes[bbio->mirror_num - 1].dev; |
6e9606d2 | 2289 | btrfs_put_bbio(bbio); |
ebbede42 AJ |
2290 | if (!dev || !dev->bdev || |
2291 | !test_bit(BTRFS_DEV_STATE_WRITEABLE, &dev->dev_state)) { | |
b5de8d0d | 2292 | btrfs_bio_counter_dec(fs_info); |
4a54c8c1 JS |
2293 | bio_put(bio); |
2294 | return -EIO; | |
2295 | } | |
74d46992 | 2296 | bio_set_dev(bio, dev->bdev); |
70fd7614 | 2297 | bio->bi_opf = REQ_OP_WRITE | REQ_SYNC; |
ffdd2018 | 2298 | bio_add_page(bio, page, length, pg_offset); |
4a54c8c1 | 2299 | |
4e49ea4a | 2300 | if (btrfsic_submit_bio_wait(bio)) { |
4a54c8c1 | 2301 | /* try to remap that extent elsewhere? */ |
b5de8d0d | 2302 | btrfs_bio_counter_dec(fs_info); |
4a54c8c1 | 2303 | bio_put(bio); |
442a4f63 | 2304 | btrfs_dev_stat_inc_and_print(dev, BTRFS_DEV_STAT_WRITE_ERRS); |
4a54c8c1 JS |
2305 | return -EIO; |
2306 | } | |
2307 | ||
b14af3b4 DS |
2308 | btrfs_info_rl_in_rcu(fs_info, |
2309 | "read error corrected: ino %llu off %llu (dev %s sector %llu)", | |
6ec656bc | 2310 | ino, start, |
1203b681 | 2311 | rcu_str_deref(dev->name), sector); |
b5de8d0d | 2312 | btrfs_bio_counter_dec(fs_info); |
4a54c8c1 JS |
2313 | bio_put(bio); |
2314 | return 0; | |
2315 | } | |
2316 | ||
20a1fbf9 | 2317 | int btrfs_repair_eb_io_failure(struct extent_buffer *eb, int mirror_num) |
ea466794 | 2318 | { |
20a1fbf9 | 2319 | struct btrfs_fs_info *fs_info = eb->fs_info; |
ea466794 | 2320 | u64 start = eb->start; |
cc5e31a4 | 2321 | int i, num_pages = num_extent_pages(eb); |
d95603b2 | 2322 | int ret = 0; |
ea466794 | 2323 | |
bc98a42c | 2324 | if (sb_rdonly(fs_info->sb)) |
908960c6 ID |
2325 | return -EROFS; |
2326 | ||
ea466794 | 2327 | for (i = 0; i < num_pages; i++) { |
fb85fc9a | 2328 | struct page *p = eb->pages[i]; |
1203b681 | 2329 | |
6ec656bc | 2330 | ret = repair_io_failure(fs_info, 0, start, PAGE_SIZE, start, p, |
1203b681 | 2331 | start - page_offset(p), mirror_num); |
ea466794 JB |
2332 | if (ret) |
2333 | break; | |
09cbfeaf | 2334 | start += PAGE_SIZE; |
ea466794 JB |
2335 | } |
2336 | ||
2337 | return ret; | |
2338 | } | |
2339 | ||
4a54c8c1 JS |
2340 | /* |
2341 | * each time an IO finishes, we do a fast check in the IO failure tree | |
2342 | * to see if we need to process or clean up an io_failure_record | |
2343 | */ | |
7870d082 JB |
2344 | int clean_io_failure(struct btrfs_fs_info *fs_info, |
2345 | struct extent_io_tree *failure_tree, | |
2346 | struct extent_io_tree *io_tree, u64 start, | |
2347 | struct page *page, u64 ino, unsigned int pg_offset) | |
4a54c8c1 JS |
2348 | { |
2349 | u64 private; | |
4a54c8c1 | 2350 | struct io_failure_record *failrec; |
4a54c8c1 JS |
2351 | struct extent_state *state; |
2352 | int num_copies; | |
4a54c8c1 | 2353 | int ret; |
4a54c8c1 JS |
2354 | |
2355 | private = 0; | |
7870d082 JB |
2356 | ret = count_range_bits(failure_tree, &private, (u64)-1, 1, |
2357 | EXTENT_DIRTY, 0); | |
4a54c8c1 JS |
2358 | if (!ret) |
2359 | return 0; | |
2360 | ||
7870d082 | 2361 | ret = get_state_failrec(failure_tree, start, &failrec); |
4a54c8c1 JS |
2362 | if (ret) |
2363 | return 0; | |
2364 | ||
4a54c8c1 JS |
2365 | BUG_ON(!failrec->this_mirror); |
2366 | ||
2367 | if (failrec->in_validation) { | |
2368 | /* there was no real error, just free the record */ | |
ab8d0fc4 JM |
2369 | btrfs_debug(fs_info, |
2370 | "clean_io_failure: freeing dummy error at %llu", | |
2371 | failrec->start); | |
4a54c8c1 JS |
2372 | goto out; |
2373 | } | |
bc98a42c | 2374 | if (sb_rdonly(fs_info->sb)) |
908960c6 | 2375 | goto out; |
4a54c8c1 | 2376 | |
7870d082 JB |
2377 | spin_lock(&io_tree->lock); |
2378 | state = find_first_extent_bit_state(io_tree, | |
4a54c8c1 JS |
2379 | failrec->start, |
2380 | EXTENT_LOCKED); | |
7870d082 | 2381 | spin_unlock(&io_tree->lock); |
4a54c8c1 | 2382 | |
883d0de4 MX |
2383 | if (state && state->start <= failrec->start && |
2384 | state->end >= failrec->start + failrec->len - 1) { | |
3ec706c8 SB |
2385 | num_copies = btrfs_num_copies(fs_info, failrec->logical, |
2386 | failrec->len); | |
4a54c8c1 | 2387 | if (num_copies > 1) { |
7870d082 JB |
2388 | repair_io_failure(fs_info, ino, start, failrec->len, |
2389 | failrec->logical, page, pg_offset, | |
2390 | failrec->failed_mirror); | |
4a54c8c1 JS |
2391 | } |
2392 | } | |
2393 | ||
2394 | out: | |
7870d082 | 2395 | free_io_failure(failure_tree, io_tree, failrec); |
4a54c8c1 | 2396 | |
454ff3de | 2397 | return 0; |
4a54c8c1 JS |
2398 | } |
2399 | ||
f612496b MX |
2400 | /* |
2401 | * Can be called when | |
2402 | * - hold extent lock | |
2403 | * - under ordered extent | |
2404 | * - the inode is freeing | |
2405 | */ | |
7ab7956e | 2406 | void btrfs_free_io_failure_record(struct btrfs_inode *inode, u64 start, u64 end) |
f612496b | 2407 | { |
7ab7956e | 2408 | struct extent_io_tree *failure_tree = &inode->io_failure_tree; |
f612496b MX |
2409 | struct io_failure_record *failrec; |
2410 | struct extent_state *state, *next; | |
2411 | ||
2412 | if (RB_EMPTY_ROOT(&failure_tree->state)) | |
2413 | return; | |
2414 | ||
2415 | spin_lock(&failure_tree->lock); | |
2416 | state = find_first_extent_bit_state(failure_tree, start, EXTENT_DIRTY); | |
2417 | while (state) { | |
2418 | if (state->start > end) | |
2419 | break; | |
2420 | ||
2421 | ASSERT(state->end <= end); | |
2422 | ||
2423 | next = next_state(state); | |
2424 | ||
47dc196a | 2425 | failrec = state->failrec; |
f612496b MX |
2426 | free_extent_state(state); |
2427 | kfree(failrec); | |
2428 | ||
2429 | state = next; | |
2430 | } | |
2431 | spin_unlock(&failure_tree->lock); | |
2432 | } | |
2433 | ||
2fe6303e | 2434 | int btrfs_get_io_failure_record(struct inode *inode, u64 start, u64 end, |
47dc196a | 2435 | struct io_failure_record **failrec_ret) |
4a54c8c1 | 2436 | { |
ab8d0fc4 | 2437 | struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); |
2fe6303e | 2438 | struct io_failure_record *failrec; |
4a54c8c1 | 2439 | struct extent_map *em; |
4a54c8c1 JS |
2440 | struct extent_io_tree *failure_tree = &BTRFS_I(inode)->io_failure_tree; |
2441 | struct extent_io_tree *tree = &BTRFS_I(inode)->io_tree; | |
2442 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; | |
4a54c8c1 | 2443 | int ret; |
4a54c8c1 JS |
2444 | u64 logical; |
2445 | ||
47dc196a | 2446 | ret = get_state_failrec(failure_tree, start, &failrec); |
4a54c8c1 JS |
2447 | if (ret) { |
2448 | failrec = kzalloc(sizeof(*failrec), GFP_NOFS); | |
2449 | if (!failrec) | |
2450 | return -ENOMEM; | |
2fe6303e | 2451 | |
4a54c8c1 JS |
2452 | failrec->start = start; |
2453 | failrec->len = end - start + 1; | |
2454 | failrec->this_mirror = 0; | |
2455 | failrec->bio_flags = 0; | |
2456 | failrec->in_validation = 0; | |
2457 | ||
2458 | read_lock(&em_tree->lock); | |
2459 | em = lookup_extent_mapping(em_tree, start, failrec->len); | |
2460 | if (!em) { | |
2461 | read_unlock(&em_tree->lock); | |
2462 | kfree(failrec); | |
2463 | return -EIO; | |
2464 | } | |
2465 | ||
68ba990f | 2466 | if (em->start > start || em->start + em->len <= start) { |
4a54c8c1 JS |
2467 | free_extent_map(em); |
2468 | em = NULL; | |
2469 | } | |
2470 | read_unlock(&em_tree->lock); | |
7a2d6a64 | 2471 | if (!em) { |
4a54c8c1 JS |
2472 | kfree(failrec); |
2473 | return -EIO; | |
2474 | } | |
2fe6303e | 2475 | |
4a54c8c1 JS |
2476 | logical = start - em->start; |
2477 | logical = em->block_start + logical; | |
2478 | if (test_bit(EXTENT_FLAG_COMPRESSED, &em->flags)) { | |
2479 | logical = em->block_start; | |
2480 | failrec->bio_flags = EXTENT_BIO_COMPRESSED; | |
2481 | extent_set_compress_type(&failrec->bio_flags, | |
2482 | em->compress_type); | |
2483 | } | |
2fe6303e | 2484 | |
ab8d0fc4 JM |
2485 | btrfs_debug(fs_info, |
2486 | "Get IO Failure Record: (new) logical=%llu, start=%llu, len=%llu", | |
2487 | logical, start, failrec->len); | |
2fe6303e | 2488 | |
4a54c8c1 JS |
2489 | failrec->logical = logical; |
2490 | free_extent_map(em); | |
2491 | ||
2492 | /* set the bits in the private failure tree */ | |
2493 | ret = set_extent_bits(failure_tree, start, end, | |
ceeb0ae7 | 2494 | EXTENT_LOCKED | EXTENT_DIRTY); |
4a54c8c1 | 2495 | if (ret >= 0) |
47dc196a | 2496 | ret = set_state_failrec(failure_tree, start, failrec); |
4a54c8c1 JS |
2497 | /* set the bits in the inode's tree */ |
2498 | if (ret >= 0) | |
ceeb0ae7 | 2499 | ret = set_extent_bits(tree, start, end, EXTENT_DAMAGED); |
4a54c8c1 JS |
2500 | if (ret < 0) { |
2501 | kfree(failrec); | |
2502 | return ret; | |
2503 | } | |
2504 | } else { | |
ab8d0fc4 JM |
2505 | btrfs_debug(fs_info, |
2506 | "Get IO Failure Record: (found) logical=%llu, start=%llu, len=%llu, validation=%d", | |
2507 | failrec->logical, failrec->start, failrec->len, | |
2508 | failrec->in_validation); | |
4a54c8c1 JS |
2509 | /* |
2510 | * when data can be on disk more than twice, add to failrec here | |
2511 | * (e.g. with a list for failed_mirror) to make | |
2512 | * clean_io_failure() clean all those errors at once. | |
2513 | */ | |
2514 | } | |
2fe6303e MX |
2515 | |
2516 | *failrec_ret = failrec; | |
2517 | ||
2518 | return 0; | |
2519 | } | |
2520 | ||
a0b60d72 | 2521 | bool btrfs_check_repairable(struct inode *inode, unsigned failed_bio_pages, |
2fe6303e MX |
2522 | struct io_failure_record *failrec, int failed_mirror) |
2523 | { | |
ab8d0fc4 | 2524 | struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); |
2fe6303e MX |
2525 | int num_copies; |
2526 | ||
ab8d0fc4 | 2527 | num_copies = btrfs_num_copies(fs_info, failrec->logical, failrec->len); |
4a54c8c1 JS |
2528 | if (num_copies == 1) { |
2529 | /* | |
2530 | * we only have a single copy of the data, so don't bother with | |
2531 | * all the retry and error correction code that follows. no | |
2532 | * matter what the error is, it is very likely to persist. | |
2533 | */ | |
ab8d0fc4 JM |
2534 | btrfs_debug(fs_info, |
2535 | "Check Repairable: cannot repair, num_copies=%d, next_mirror %d, failed_mirror %d", | |
2536 | num_copies, failrec->this_mirror, failed_mirror); | |
c3cfb656 | 2537 | return false; |
4a54c8c1 JS |
2538 | } |
2539 | ||
4a54c8c1 JS |
2540 | /* |
2541 | * there are two premises: | |
2542 | * a) deliver good data to the caller | |
2543 | * b) correct the bad sectors on disk | |
2544 | */ | |
a0b60d72 | 2545 | if (failed_bio_pages > 1) { |
4a54c8c1 JS |
2546 | /* |
2547 | * to fulfill b), we need to know the exact failing sectors, as | |
2548 | * we don't want to rewrite any more than the failed ones. thus, | |
2549 | * we need separate read requests for the failed bio | |
2550 | * | |
2551 | * if the following BUG_ON triggers, our validation request got | |
2552 | * merged. we need separate requests for our algorithm to work. | |
2553 | */ | |
2554 | BUG_ON(failrec->in_validation); | |
2555 | failrec->in_validation = 1; | |
2556 | failrec->this_mirror = failed_mirror; | |
4a54c8c1 JS |
2557 | } else { |
2558 | /* | |
2559 | * we're ready to fulfill a) and b) alongside. get a good copy | |
2560 | * of the failed sector and if we succeed, we have setup | |
2561 | * everything for repair_io_failure to do the rest for us. | |
2562 | */ | |
2563 | if (failrec->in_validation) { | |
2564 | BUG_ON(failrec->this_mirror != failed_mirror); | |
2565 | failrec->in_validation = 0; | |
2566 | failrec->this_mirror = 0; | |
2567 | } | |
2568 | failrec->failed_mirror = failed_mirror; | |
2569 | failrec->this_mirror++; | |
2570 | if (failrec->this_mirror == failed_mirror) | |
2571 | failrec->this_mirror++; | |
4a54c8c1 JS |
2572 | } |
2573 | ||
facc8a22 | 2574 | if (failrec->this_mirror > num_copies) { |
ab8d0fc4 JM |
2575 | btrfs_debug(fs_info, |
2576 | "Check Repairable: (fail) num_copies=%d, next_mirror %d, failed_mirror %d", | |
2577 | num_copies, failrec->this_mirror, failed_mirror); | |
c3cfb656 | 2578 | return false; |
4a54c8c1 JS |
2579 | } |
2580 | ||
c3cfb656 | 2581 | return true; |
2fe6303e MX |
2582 | } |
2583 | ||
2584 | ||
2585 | struct bio *btrfs_create_repair_bio(struct inode *inode, struct bio *failed_bio, | |
2586 | struct io_failure_record *failrec, | |
2587 | struct page *page, int pg_offset, int icsum, | |
8b110e39 | 2588 | bio_end_io_t *endio_func, void *data) |
2fe6303e | 2589 | { |
0b246afa | 2590 | struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); |
2fe6303e MX |
2591 | struct bio *bio; |
2592 | struct btrfs_io_bio *btrfs_failed_bio; | |
2593 | struct btrfs_io_bio *btrfs_bio; | |
2594 | ||
c5e4c3d7 | 2595 | bio = btrfs_io_bio_alloc(1); |
2fe6303e | 2596 | bio->bi_end_io = endio_func; |
4f024f37 | 2597 | bio->bi_iter.bi_sector = failrec->logical >> 9; |
4f024f37 | 2598 | bio->bi_iter.bi_size = 0; |
8b110e39 | 2599 | bio->bi_private = data; |
4a54c8c1 | 2600 | |
facc8a22 MX |
2601 | btrfs_failed_bio = btrfs_io_bio(failed_bio); |
2602 | if (btrfs_failed_bio->csum) { | |
facc8a22 MX |
2603 | u16 csum_size = btrfs_super_csum_size(fs_info->super_copy); |
2604 | ||
2605 | btrfs_bio = btrfs_io_bio(bio); | |
2606 | btrfs_bio->csum = btrfs_bio->csum_inline; | |
2fe6303e MX |
2607 | icsum *= csum_size; |
2608 | memcpy(btrfs_bio->csum, btrfs_failed_bio->csum + icsum, | |
facc8a22 MX |
2609 | csum_size); |
2610 | } | |
2611 | ||
2fe6303e MX |
2612 | bio_add_page(bio, page, failrec->len, pg_offset); |
2613 | ||
2614 | return bio; | |
2615 | } | |
2616 | ||
2617 | /* | |
78e62c02 NB |
2618 | * This is a generic handler for readpage errors. If other copies exist, read |
2619 | * those and write back good data to the failed position. Does not investigate | |
2620 | * in remapping the failed extent elsewhere, hoping the device will be smart | |
2621 | * enough to do this as needed | |
2fe6303e | 2622 | */ |
2fe6303e MX |
2623 | static int bio_readpage_error(struct bio *failed_bio, u64 phy_offset, |
2624 | struct page *page, u64 start, u64 end, | |
2625 | int failed_mirror) | |
2626 | { | |
2627 | struct io_failure_record *failrec; | |
2628 | struct inode *inode = page->mapping->host; | |
2629 | struct extent_io_tree *tree = &BTRFS_I(inode)->io_tree; | |
7870d082 | 2630 | struct extent_io_tree *failure_tree = &BTRFS_I(inode)->io_failure_tree; |
2fe6303e | 2631 | struct bio *bio; |
70fd7614 | 2632 | int read_mode = 0; |
4e4cbee9 | 2633 | blk_status_t status; |
2fe6303e | 2634 | int ret; |
8a2ee44a | 2635 | unsigned failed_bio_pages = failed_bio->bi_iter.bi_size >> PAGE_SHIFT; |
2fe6303e | 2636 | |
1f7ad75b | 2637 | BUG_ON(bio_op(failed_bio) == REQ_OP_WRITE); |
2fe6303e MX |
2638 | |
2639 | ret = btrfs_get_io_failure_record(inode, start, end, &failrec); | |
2640 | if (ret) | |
2641 | return ret; | |
2642 | ||
a0b60d72 | 2643 | if (!btrfs_check_repairable(inode, failed_bio_pages, failrec, |
c3cfb656 | 2644 | failed_mirror)) { |
7870d082 | 2645 | free_io_failure(failure_tree, tree, failrec); |
2fe6303e MX |
2646 | return -EIO; |
2647 | } | |
2648 | ||
a0b60d72 | 2649 | if (failed_bio_pages > 1) |
70fd7614 | 2650 | read_mode |= REQ_FAILFAST_DEV; |
2fe6303e MX |
2651 | |
2652 | phy_offset >>= inode->i_sb->s_blocksize_bits; | |
2653 | bio = btrfs_create_repair_bio(inode, failed_bio, failrec, page, | |
2654 | start - page_offset(page), | |
8b110e39 MX |
2655 | (int)phy_offset, failed_bio->bi_end_io, |
2656 | NULL); | |
ebcc3263 | 2657 | bio->bi_opf = REQ_OP_READ | read_mode; |
4a54c8c1 | 2658 | |
ab8d0fc4 JM |
2659 | btrfs_debug(btrfs_sb(inode->i_sb), |
2660 | "Repair Read Error: submitting new read[%#x] to this_mirror=%d, in_validation=%d", | |
2661 | read_mode, failrec->this_mirror, failrec->in_validation); | |
4a54c8c1 | 2662 | |
8c27cb35 | 2663 | status = tree->ops->submit_bio_hook(tree->private_data, bio, failrec->this_mirror, |
50489a57 | 2664 | failrec->bio_flags); |
4e4cbee9 | 2665 | if (status) { |
7870d082 | 2666 | free_io_failure(failure_tree, tree, failrec); |
6c387ab2 | 2667 | bio_put(bio); |
4e4cbee9 | 2668 | ret = blk_status_to_errno(status); |
6c387ab2 MX |
2669 | } |
2670 | ||
013bd4c3 | 2671 | return ret; |
4a54c8c1 JS |
2672 | } |
2673 | ||
d1310b2e CM |
2674 | /* lots and lots of room for performance fixes in the end_bio funcs */ |
2675 | ||
b5227c07 | 2676 | void end_extent_writepage(struct page *page, int err, u64 start, u64 end) |
87826df0 JM |
2677 | { |
2678 | int uptodate = (err == 0); | |
3e2426bd | 2679 | int ret = 0; |
87826df0 | 2680 | |
c629732d | 2681 | btrfs_writepage_endio_finish_ordered(page, start, end, uptodate); |
87826df0 | 2682 | |
87826df0 | 2683 | if (!uptodate) { |
87826df0 JM |
2684 | ClearPageUptodate(page); |
2685 | SetPageError(page); | |
bff5baf8 | 2686 | ret = err < 0 ? err : -EIO; |
5dca6eea | 2687 | mapping_set_error(page->mapping, ret); |
87826df0 | 2688 | } |
87826df0 JM |
2689 | } |
2690 | ||
d1310b2e CM |
2691 | /* |
2692 | * after a writepage IO is done, we need to: | |
2693 | * clear the uptodate bits on error | |
2694 | * clear the writeback bits in the extent tree for this IO | |
2695 | * end_page_writeback if the page has no more pending IO | |
2696 | * | |
2697 | * Scheduling is not allowed, so the extent state tree is expected | |
2698 | * to have one and only one object corresponding to this IO. | |
2699 | */ | |
4246a0b6 | 2700 | static void end_bio_extent_writepage(struct bio *bio) |
d1310b2e | 2701 | { |
4e4cbee9 | 2702 | int error = blk_status_to_errno(bio->bi_status); |
2c30c71b | 2703 | struct bio_vec *bvec; |
d1310b2e CM |
2704 | u64 start; |
2705 | u64 end; | |
6dc4f100 | 2706 | struct bvec_iter_all iter_all; |
d1310b2e | 2707 | |
c09abff8 | 2708 | ASSERT(!bio_flagged(bio, BIO_CLONED)); |
2b070cfe | 2709 | bio_for_each_segment_all(bvec, bio, iter_all) { |
d1310b2e | 2710 | struct page *page = bvec->bv_page; |
0b246afa JM |
2711 | struct inode *inode = page->mapping->host; |
2712 | struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); | |
902b22f3 | 2713 | |
17a5adcc AO |
2714 | /* We always issue full-page reads, but if some block |
2715 | * in a page fails to read, blk_update_request() will | |
2716 | * advance bv_offset and adjust bv_len to compensate. | |
2717 | * Print a warning for nonzero offsets, and an error | |
2718 | * if they don't add up to a full page. */ | |
09cbfeaf KS |
2719 | if (bvec->bv_offset || bvec->bv_len != PAGE_SIZE) { |
2720 | if (bvec->bv_offset + bvec->bv_len != PAGE_SIZE) | |
0b246afa | 2721 | btrfs_err(fs_info, |
efe120a0 FH |
2722 | "partial page write in btrfs with offset %u and length %u", |
2723 | bvec->bv_offset, bvec->bv_len); | |
2724 | else | |
0b246afa | 2725 | btrfs_info(fs_info, |
5d163e0e | 2726 | "incomplete page write in btrfs with offset %u and length %u", |
efe120a0 FH |
2727 | bvec->bv_offset, bvec->bv_len); |
2728 | } | |
d1310b2e | 2729 | |
17a5adcc AO |
2730 | start = page_offset(page); |
2731 | end = start + bvec->bv_offset + bvec->bv_len - 1; | |
d1310b2e | 2732 | |
4e4cbee9 | 2733 | end_extent_writepage(page, error, start, end); |
17a5adcc | 2734 | end_page_writeback(page); |
2c30c71b | 2735 | } |
2b1f55b0 | 2736 | |
d1310b2e | 2737 | bio_put(bio); |
d1310b2e CM |
2738 | } |
2739 | ||
883d0de4 MX |
2740 | static void |
2741 | endio_readpage_release_extent(struct extent_io_tree *tree, u64 start, u64 len, | |
2742 | int uptodate) | |
2743 | { | |
2744 | struct extent_state *cached = NULL; | |
2745 | u64 end = start + len - 1; | |
2746 | ||
2747 | if (uptodate && tree->track_uptodate) | |
2748 | set_extent_uptodate(tree, start, end, &cached, GFP_ATOMIC); | |
d810a4be | 2749 | unlock_extent_cached_atomic(tree, start, end, &cached); |
883d0de4 MX |
2750 | } |
2751 | ||
d1310b2e CM |
2752 | /* |
2753 | * after a readpage IO is done, we need to: | |
2754 | * clear the uptodate bits on error | |
2755 | * set the uptodate bits if things worked | |
2756 | * set the page up to date if all extents in the tree are uptodate | |
2757 | * clear the lock bit in the extent tree | |
2758 | * unlock the page if there are no other extents locked for it | |
2759 | * | |
2760 | * Scheduling is not allowed, so the extent state tree is expected | |
2761 | * to have one and only one object corresponding to this IO. | |
2762 | */ | |
4246a0b6 | 2763 | static void end_bio_extent_readpage(struct bio *bio) |
d1310b2e | 2764 | { |
2c30c71b | 2765 | struct bio_vec *bvec; |
4e4cbee9 | 2766 | int uptodate = !bio->bi_status; |
facc8a22 | 2767 | struct btrfs_io_bio *io_bio = btrfs_io_bio(bio); |
7870d082 | 2768 | struct extent_io_tree *tree, *failure_tree; |
facc8a22 | 2769 | u64 offset = 0; |
d1310b2e CM |
2770 | u64 start; |
2771 | u64 end; | |
facc8a22 | 2772 | u64 len; |
883d0de4 MX |
2773 | u64 extent_start = 0; |
2774 | u64 extent_len = 0; | |
5cf1ab56 | 2775 | int mirror; |
d1310b2e | 2776 | int ret; |
6dc4f100 | 2777 | struct bvec_iter_all iter_all; |
d1310b2e | 2778 | |
c09abff8 | 2779 | ASSERT(!bio_flagged(bio, BIO_CLONED)); |
2b070cfe | 2780 | bio_for_each_segment_all(bvec, bio, iter_all) { |
d1310b2e | 2781 | struct page *page = bvec->bv_page; |
a71754fc | 2782 | struct inode *inode = page->mapping->host; |
ab8d0fc4 | 2783 | struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); |
78e62c02 NB |
2784 | bool data_inode = btrfs_ino(BTRFS_I(inode)) |
2785 | != BTRFS_BTREE_INODE_OBJECTID; | |
507903b8 | 2786 | |
ab8d0fc4 JM |
2787 | btrfs_debug(fs_info, |
2788 | "end_bio_extent_readpage: bi_sector=%llu, err=%d, mirror=%u", | |
4e4cbee9 | 2789 | (u64)bio->bi_iter.bi_sector, bio->bi_status, |
ab8d0fc4 | 2790 | io_bio->mirror_num); |
a71754fc | 2791 | tree = &BTRFS_I(inode)->io_tree; |
7870d082 | 2792 | failure_tree = &BTRFS_I(inode)->io_failure_tree; |
902b22f3 | 2793 | |
17a5adcc AO |
2794 | /* We always issue full-page reads, but if some block |
2795 | * in a page fails to read, blk_update_request() will | |
2796 | * advance bv_offset and adjust bv_len to compensate. | |
2797 | * Print a warning for nonzero offsets, and an error | |
2798 | * if they don't add up to a full page. */ | |
09cbfeaf KS |
2799 | if (bvec->bv_offset || bvec->bv_len != PAGE_SIZE) { |
2800 | if (bvec->bv_offset + bvec->bv_len != PAGE_SIZE) | |
ab8d0fc4 JM |
2801 | btrfs_err(fs_info, |
2802 | "partial page read in btrfs with offset %u and length %u", | |
efe120a0 FH |
2803 | bvec->bv_offset, bvec->bv_len); |
2804 | else | |
ab8d0fc4 JM |
2805 | btrfs_info(fs_info, |
2806 | "incomplete page read in btrfs with offset %u and length %u", | |
efe120a0 FH |
2807 | bvec->bv_offset, bvec->bv_len); |
2808 | } | |
d1310b2e | 2809 | |
17a5adcc AO |
2810 | start = page_offset(page); |
2811 | end = start + bvec->bv_offset + bvec->bv_len - 1; | |
facc8a22 | 2812 | len = bvec->bv_len; |
d1310b2e | 2813 | |
9be3395b | 2814 | mirror = io_bio->mirror_num; |
78e62c02 | 2815 | if (likely(uptodate)) { |
facc8a22 MX |
2816 | ret = tree->ops->readpage_end_io_hook(io_bio, offset, |
2817 | page, start, end, | |
2818 | mirror); | |
5ee0844d | 2819 | if (ret) |
d1310b2e | 2820 | uptodate = 0; |
5ee0844d | 2821 | else |
7870d082 JB |
2822 | clean_io_failure(BTRFS_I(inode)->root->fs_info, |
2823 | failure_tree, tree, start, | |
2824 | page, | |
2825 | btrfs_ino(BTRFS_I(inode)), 0); | |
d1310b2e | 2826 | } |
ea466794 | 2827 | |
f2a09da9 MX |
2828 | if (likely(uptodate)) |
2829 | goto readpage_ok; | |
2830 | ||
78e62c02 | 2831 | if (data_inode) { |
9d0d1c8b | 2832 | |
f4a8e656 | 2833 | /* |
78e62c02 NB |
2834 | * The generic bio_readpage_error handles errors the |
2835 | * following way: If possible, new read requests are | |
2836 | * created and submitted and will end up in | |
2837 | * end_bio_extent_readpage as well (if we're lucky, | |
2838 | * not in the !uptodate case). In that case it returns | |
2839 | * 0 and we just go on with the next page in our bio. | |
2840 | * If it can't handle the error it will return -EIO and | |
2841 | * we remain responsible for that page. | |
f4a8e656 | 2842 | */ |
78e62c02 NB |
2843 | ret = bio_readpage_error(bio, offset, page, start, end, |
2844 | mirror); | |
2845 | if (ret == 0) { | |
2846 | uptodate = !bio->bi_status; | |
2847 | offset += len; | |
2848 | continue; | |
2849 | } | |
2850 | } else { | |
2851 | struct extent_buffer *eb; | |
2852 | ||
2853 | eb = (struct extent_buffer *)page->private; | |
2854 | set_bit(EXTENT_BUFFER_READ_ERR, &eb->bflags); | |
2855 | eb->read_mirror = mirror; | |
2856 | atomic_dec(&eb->io_pages); | |
2857 | if (test_and_clear_bit(EXTENT_BUFFER_READAHEAD, | |
2858 | &eb->bflags)) | |
2859 | btree_readahead_hook(eb, -EIO); | |
7e38326f | 2860 | } |
f2a09da9 | 2861 | readpage_ok: |
883d0de4 | 2862 | if (likely(uptodate)) { |
a71754fc | 2863 | loff_t i_size = i_size_read(inode); |
09cbfeaf | 2864 | pgoff_t end_index = i_size >> PAGE_SHIFT; |
a583c026 | 2865 | unsigned off; |
a71754fc JB |
2866 | |
2867 | /* Zero out the end if this page straddles i_size */ | |
7073017a | 2868 | off = offset_in_page(i_size); |
a583c026 | 2869 | if (page->index == end_index && off) |
09cbfeaf | 2870 | zero_user_segment(page, off, PAGE_SIZE); |
17a5adcc | 2871 | SetPageUptodate(page); |
70dec807 | 2872 | } else { |
17a5adcc AO |
2873 | ClearPageUptodate(page); |
2874 | SetPageError(page); | |
70dec807 | 2875 | } |
17a5adcc | 2876 | unlock_page(page); |
facc8a22 | 2877 | offset += len; |
883d0de4 MX |
2878 | |
2879 | if (unlikely(!uptodate)) { | |
2880 | if (extent_len) { | |
2881 | endio_readpage_release_extent(tree, | |
2882 | extent_start, | |
2883 | extent_len, 1); | |
2884 | extent_start = 0; | |
2885 | extent_len = 0; | |
2886 | } | |
2887 | endio_readpage_release_extent(tree, start, | |
2888 | end - start + 1, 0); | |
2889 | } else if (!extent_len) { | |
2890 | extent_start = start; | |
2891 | extent_len = end + 1 - start; | |
2892 | } else if (extent_start + extent_len == start) { | |
2893 | extent_len += end + 1 - start; | |
2894 | } else { | |
2895 | endio_readpage_release_extent(tree, extent_start, | |
2896 | extent_len, uptodate); | |
2897 | extent_start = start; | |
2898 | extent_len = end + 1 - start; | |
2899 | } | |
2c30c71b | 2900 | } |
d1310b2e | 2901 | |
883d0de4 MX |
2902 | if (extent_len) |
2903 | endio_readpage_release_extent(tree, extent_start, extent_len, | |
2904 | uptodate); | |
b3a0dd50 | 2905 | btrfs_io_bio_free_csum(io_bio); |
d1310b2e | 2906 | bio_put(bio); |
d1310b2e CM |
2907 | } |
2908 | ||
9be3395b | 2909 | /* |
184f999e DS |
2910 | * Initialize the members up to but not including 'bio'. Use after allocating a |
2911 | * new bio by bio_alloc_bioset as it does not initialize the bytes outside of | |
2912 | * 'bio' because use of __GFP_ZERO is not supported. | |
9be3395b | 2913 | */ |
184f999e | 2914 | static inline void btrfs_io_bio_init(struct btrfs_io_bio *btrfs_bio) |
d1310b2e | 2915 | { |
184f999e DS |
2916 | memset(btrfs_bio, 0, offsetof(struct btrfs_io_bio, bio)); |
2917 | } | |
d1310b2e | 2918 | |
9be3395b | 2919 | /* |
6e707bcd DS |
2920 | * The following helpers allocate a bio. As it's backed by a bioset, it'll |
2921 | * never fail. We're returning a bio right now but you can call btrfs_io_bio | |
2922 | * for the appropriate container_of magic | |
9be3395b | 2923 | */ |
e749af44 | 2924 | struct bio *btrfs_bio_alloc(u64 first_byte) |
d1310b2e CM |
2925 | { |
2926 | struct bio *bio; | |
d1310b2e | 2927 | |
8ac9f7c1 | 2928 | bio = bio_alloc_bioset(GFP_NOFS, BIO_MAX_PAGES, &btrfs_bioset); |
c821e7f3 | 2929 | bio->bi_iter.bi_sector = first_byte >> 9; |
184f999e | 2930 | btrfs_io_bio_init(btrfs_io_bio(bio)); |
d1310b2e CM |
2931 | return bio; |
2932 | } | |
2933 | ||
8b6c1d56 | 2934 | struct bio *btrfs_bio_clone(struct bio *bio) |
9be3395b | 2935 | { |
23ea8e5a MX |
2936 | struct btrfs_io_bio *btrfs_bio; |
2937 | struct bio *new; | |
9be3395b | 2938 | |
6e707bcd | 2939 | /* Bio allocation backed by a bioset does not fail */ |
8ac9f7c1 | 2940 | new = bio_clone_fast(bio, GFP_NOFS, &btrfs_bioset); |
6e707bcd | 2941 | btrfs_bio = btrfs_io_bio(new); |
184f999e | 2942 | btrfs_io_bio_init(btrfs_bio); |
6e707bcd | 2943 | btrfs_bio->iter = bio->bi_iter; |
23ea8e5a MX |
2944 | return new; |
2945 | } | |
9be3395b | 2946 | |
c5e4c3d7 | 2947 | struct bio *btrfs_io_bio_alloc(unsigned int nr_iovecs) |
9be3395b | 2948 | { |
facc8a22 MX |
2949 | struct bio *bio; |
2950 | ||
6e707bcd | 2951 | /* Bio allocation backed by a bioset does not fail */ |
8ac9f7c1 | 2952 | bio = bio_alloc_bioset(GFP_NOFS, nr_iovecs, &btrfs_bioset); |
184f999e | 2953 | btrfs_io_bio_init(btrfs_io_bio(bio)); |
facc8a22 | 2954 | return bio; |
9be3395b CM |
2955 | } |
2956 | ||
e477094f | 2957 | struct bio *btrfs_bio_clone_partial(struct bio *orig, int offset, int size) |
2f8e9140 LB |
2958 | { |
2959 | struct bio *bio; | |
2960 | struct btrfs_io_bio *btrfs_bio; | |
2961 | ||
2962 | /* this will never fail when it's backed by a bioset */ | |
8ac9f7c1 | 2963 | bio = bio_clone_fast(orig, GFP_NOFS, &btrfs_bioset); |
2f8e9140 LB |
2964 | ASSERT(bio); |
2965 | ||
2966 | btrfs_bio = btrfs_io_bio(bio); | |
184f999e | 2967 | btrfs_io_bio_init(btrfs_bio); |
2f8e9140 LB |
2968 | |
2969 | bio_trim(bio, offset >> 9, size >> 9); | |
17347cec | 2970 | btrfs_bio->iter = bio->bi_iter; |
2f8e9140 LB |
2971 | return bio; |
2972 | } | |
9be3395b | 2973 | |
4b81ba48 DS |
2974 | /* |
2975 | * @opf: bio REQ_OP_* and REQ_* flags as one value | |
b8b3d625 DS |
2976 | * @wbc: optional writeback control for io accounting |
2977 | * @page: page to add to the bio | |
2978 | * @pg_offset: offset of the new bio or to check whether we are adding | |
2979 | * a contiguous page to the previous one | |
2980 | * @size: portion of page that we want to write | |
2981 | * @offset: starting offset in the page | |
5c2b1fd7 | 2982 | * @bio_ret: must be valid pointer, newly allocated bio will be stored there |
b8b3d625 DS |
2983 | * @end_io_func: end_io callback for new bio |
2984 | * @mirror_num: desired mirror to read/write | |
2985 | * @prev_bio_flags: flags of previous bio to see if we can merge the current one | |
2986 | * @bio_flags: flags of the current bio to see if we can merge them | |
4b81ba48 | 2987 | */ |
0ceb34bf | 2988 | static int submit_extent_page(unsigned int opf, |
da2f0f74 | 2989 | struct writeback_control *wbc, |
6273b7f8 | 2990 | struct page *page, u64 offset, |
6c5a4e2c | 2991 | size_t size, unsigned long pg_offset, |
d1310b2e | 2992 | struct bio **bio_ret, |
f188591e | 2993 | bio_end_io_t end_io_func, |
c8b97818 CM |
2994 | int mirror_num, |
2995 | unsigned long prev_bio_flags, | |
005efedf FM |
2996 | unsigned long bio_flags, |
2997 | bool force_bio_submit) | |
d1310b2e CM |
2998 | { |
2999 | int ret = 0; | |
3000 | struct bio *bio; | |
09cbfeaf | 3001 | size_t page_size = min_t(size_t, size, PAGE_SIZE); |
6273b7f8 | 3002 | sector_t sector = offset >> 9; |
0ceb34bf | 3003 | struct extent_io_tree *tree = &BTRFS_I(page->mapping->host)->io_tree; |
d1310b2e | 3004 | |
5c2b1fd7 DS |
3005 | ASSERT(bio_ret); |
3006 | ||
3007 | if (*bio_ret) { | |
0c8508a6 DS |
3008 | bool contig; |
3009 | bool can_merge = true; | |
3010 | ||
d1310b2e | 3011 | bio = *bio_ret; |
0c8508a6 | 3012 | if (prev_bio_flags & EXTENT_BIO_COMPRESSED) |
4f024f37 | 3013 | contig = bio->bi_iter.bi_sector == sector; |
c8b97818 | 3014 | else |
f73a1c7d | 3015 | contig = bio_end_sector(bio) == sector; |
c8b97818 | 3016 | |
da12fe54 NB |
3017 | ASSERT(tree->ops); |
3018 | if (btrfs_bio_fits_in_stripe(page, page_size, bio, bio_flags)) | |
0c8508a6 DS |
3019 | can_merge = false; |
3020 | ||
3021 | if (prev_bio_flags != bio_flags || !contig || !can_merge || | |
005efedf | 3022 | force_bio_submit || |
6c5a4e2c | 3023 | bio_add_page(bio, page, page_size, pg_offset) < page_size) { |
1f7ad75b | 3024 | ret = submit_one_bio(bio, mirror_num, prev_bio_flags); |
289454ad NA |
3025 | if (ret < 0) { |
3026 | *bio_ret = NULL; | |
79787eaa | 3027 | return ret; |
289454ad | 3028 | } |
d1310b2e CM |
3029 | bio = NULL; |
3030 | } else { | |
da2f0f74 | 3031 | if (wbc) |
34e51a5e | 3032 | wbc_account_cgroup_owner(wbc, page, page_size); |
d1310b2e CM |
3033 | return 0; |
3034 | } | |
3035 | } | |
c8b97818 | 3036 | |
e749af44 | 3037 | bio = btrfs_bio_alloc(offset); |
6c5a4e2c | 3038 | bio_add_page(bio, page, page_size, pg_offset); |
d1310b2e CM |
3039 | bio->bi_end_io = end_io_func; |
3040 | bio->bi_private = tree; | |
e6959b93 | 3041 | bio->bi_write_hint = page->mapping->host->i_write_hint; |
4b81ba48 | 3042 | bio->bi_opf = opf; |
da2f0f74 | 3043 | if (wbc) { |
429aebc0 DS |
3044 | struct block_device *bdev; |
3045 | ||
3046 | bdev = BTRFS_I(page->mapping->host)->root->fs_info->fs_devices->latest_bdev; | |
3047 | bio_set_dev(bio, bdev); | |
da2f0f74 | 3048 | wbc_init_bio(wbc, bio); |
34e51a5e | 3049 | wbc_account_cgroup_owner(wbc, page, page_size); |
da2f0f74 | 3050 | } |
70dec807 | 3051 | |
5c2b1fd7 | 3052 | *bio_ret = bio; |
d1310b2e CM |
3053 | |
3054 | return ret; | |
3055 | } | |
3056 | ||
48a3b636 ES |
3057 | static void attach_extent_buffer_page(struct extent_buffer *eb, |
3058 | struct page *page) | |
d1310b2e CM |
3059 | { |
3060 | if (!PagePrivate(page)) { | |
3061 | SetPagePrivate(page); | |
09cbfeaf | 3062 | get_page(page); |
4f2de97a JB |
3063 | set_page_private(page, (unsigned long)eb); |
3064 | } else { | |
3065 | WARN_ON(page->private != (unsigned long)eb); | |
d1310b2e CM |
3066 | } |
3067 | } | |
3068 | ||
4f2de97a | 3069 | void set_page_extent_mapped(struct page *page) |
d1310b2e | 3070 | { |
4f2de97a JB |
3071 | if (!PagePrivate(page)) { |
3072 | SetPagePrivate(page); | |
09cbfeaf | 3073 | get_page(page); |
4f2de97a JB |
3074 | set_page_private(page, EXTENT_PAGE_PRIVATE); |
3075 | } | |
d1310b2e CM |
3076 | } |
3077 | ||
125bac01 MX |
3078 | static struct extent_map * |
3079 | __get_extent_map(struct inode *inode, struct page *page, size_t pg_offset, | |
3080 | u64 start, u64 len, get_extent_t *get_extent, | |
3081 | struct extent_map **em_cached) | |
3082 | { | |
3083 | struct extent_map *em; | |
3084 | ||
3085 | if (em_cached && *em_cached) { | |
3086 | em = *em_cached; | |
cbc0e928 | 3087 | if (extent_map_in_tree(em) && start >= em->start && |
125bac01 | 3088 | start < extent_map_end(em)) { |
490b54d6 | 3089 | refcount_inc(&em->refs); |
125bac01 MX |
3090 | return em; |
3091 | } | |
3092 | ||
3093 | free_extent_map(em); | |
3094 | *em_cached = NULL; | |
3095 | } | |
3096 | ||
39b07b5d | 3097 | em = get_extent(BTRFS_I(inode), page, pg_offset, start, len); |
125bac01 MX |
3098 | if (em_cached && !IS_ERR_OR_NULL(em)) { |
3099 | BUG_ON(*em_cached); | |
490b54d6 | 3100 | refcount_inc(&em->refs); |
125bac01 MX |
3101 | *em_cached = em; |
3102 | } | |
3103 | return em; | |
3104 | } | |
d1310b2e CM |
3105 | /* |
3106 | * basic readpage implementation. Locked extent state structs are inserted | |
3107 | * into the tree that are removed when the IO is done (by the end_io | |
3108 | * handlers) | |
79787eaa | 3109 | * XXX JDM: This needs looking at to ensure proper page locking |
baf863b9 | 3110 | * return 0 on success, otherwise return error |
d1310b2e | 3111 | */ |
9974090b MX |
3112 | static int __do_readpage(struct extent_io_tree *tree, |
3113 | struct page *page, | |
3114 | get_extent_t *get_extent, | |
125bac01 | 3115 | struct extent_map **em_cached, |
9974090b | 3116 | struct bio **bio, int mirror_num, |
f1c77c55 | 3117 | unsigned long *bio_flags, unsigned int read_flags, |
005efedf | 3118 | u64 *prev_em_start) |
d1310b2e CM |
3119 | { |
3120 | struct inode *inode = page->mapping->host; | |
4eee4fa4 | 3121 | u64 start = page_offset(page); |
8eec8296 | 3122 | const u64 end = start + PAGE_SIZE - 1; |
d1310b2e CM |
3123 | u64 cur = start; |
3124 | u64 extent_offset; | |
3125 | u64 last_byte = i_size_read(inode); | |
3126 | u64 block_start; | |
3127 | u64 cur_end; | |
d1310b2e | 3128 | struct extent_map *em; |
baf863b9 | 3129 | int ret = 0; |
d1310b2e | 3130 | int nr = 0; |
306e16ce | 3131 | size_t pg_offset = 0; |
d1310b2e | 3132 | size_t iosize; |
c8b97818 | 3133 | size_t disk_io_size; |
d1310b2e | 3134 | size_t blocksize = inode->i_sb->s_blocksize; |
7f042a83 | 3135 | unsigned long this_bio_flag = 0; |
d1310b2e | 3136 | |
ae6957eb DS |
3137 | ASSERT(tree == &BTRFS_I(inode)->io_tree); |
3138 | ||
d1310b2e CM |
3139 | set_page_extent_mapped(page); |
3140 | ||
90a887c9 DM |
3141 | if (!PageUptodate(page)) { |
3142 | if (cleancache_get_page(page) == 0) { | |
3143 | BUG_ON(blocksize != PAGE_SIZE); | |
9974090b | 3144 | unlock_extent(tree, start, end); |
90a887c9 DM |
3145 | goto out; |
3146 | } | |
3147 | } | |
3148 | ||
09cbfeaf | 3149 | if (page->index == last_byte >> PAGE_SHIFT) { |
c8b97818 | 3150 | char *userpage; |
7073017a | 3151 | size_t zero_offset = offset_in_page(last_byte); |
c8b97818 CM |
3152 | |
3153 | if (zero_offset) { | |
09cbfeaf | 3154 | iosize = PAGE_SIZE - zero_offset; |
7ac687d9 | 3155 | userpage = kmap_atomic(page); |
c8b97818 CM |
3156 | memset(userpage + zero_offset, 0, iosize); |
3157 | flush_dcache_page(page); | |
7ac687d9 | 3158 | kunmap_atomic(userpage); |
c8b97818 CM |
3159 | } |
3160 | } | |
d1310b2e | 3161 | while (cur <= end) { |
005efedf | 3162 | bool force_bio_submit = false; |
6273b7f8 | 3163 | u64 offset; |
c8f2f24b | 3164 | |
d1310b2e CM |
3165 | if (cur >= last_byte) { |
3166 | char *userpage; | |
507903b8 AJ |
3167 | struct extent_state *cached = NULL; |
3168 | ||
09cbfeaf | 3169 | iosize = PAGE_SIZE - pg_offset; |
7ac687d9 | 3170 | userpage = kmap_atomic(page); |
306e16ce | 3171 | memset(userpage + pg_offset, 0, iosize); |
d1310b2e | 3172 | flush_dcache_page(page); |
7ac687d9 | 3173 | kunmap_atomic(userpage); |
d1310b2e | 3174 | set_extent_uptodate(tree, cur, cur + iosize - 1, |
507903b8 | 3175 | &cached, GFP_NOFS); |
7f042a83 | 3176 | unlock_extent_cached(tree, cur, |
e43bbe5e | 3177 | cur + iosize - 1, &cached); |
d1310b2e CM |
3178 | break; |
3179 | } | |
125bac01 MX |
3180 | em = __get_extent_map(inode, page, pg_offset, cur, |
3181 | end - cur + 1, get_extent, em_cached); | |
c704005d | 3182 | if (IS_ERR_OR_NULL(em)) { |
d1310b2e | 3183 | SetPageError(page); |
7f042a83 | 3184 | unlock_extent(tree, cur, end); |
d1310b2e CM |
3185 | break; |
3186 | } | |
d1310b2e CM |
3187 | extent_offset = cur - em->start; |
3188 | BUG_ON(extent_map_end(em) <= cur); | |
3189 | BUG_ON(end < cur); | |
3190 | ||
261507a0 | 3191 | if (test_bit(EXTENT_FLAG_COMPRESSED, &em->flags)) { |
4b384318 | 3192 | this_bio_flag |= EXTENT_BIO_COMPRESSED; |
261507a0 LZ |
3193 | extent_set_compress_type(&this_bio_flag, |
3194 | em->compress_type); | |
3195 | } | |
c8b97818 | 3196 | |
d1310b2e CM |
3197 | iosize = min(extent_map_end(em) - cur, end - cur + 1); |
3198 | cur_end = min(extent_map_end(em) - 1, end); | |
fda2832f | 3199 | iosize = ALIGN(iosize, blocksize); |
c8b97818 CM |
3200 | if (this_bio_flag & EXTENT_BIO_COMPRESSED) { |
3201 | disk_io_size = em->block_len; | |
6273b7f8 | 3202 | offset = em->block_start; |
c8b97818 | 3203 | } else { |
6273b7f8 | 3204 | offset = em->block_start + extent_offset; |
c8b97818 CM |
3205 | disk_io_size = iosize; |
3206 | } | |
d1310b2e | 3207 | block_start = em->block_start; |
d899e052 YZ |
3208 | if (test_bit(EXTENT_FLAG_PREALLOC, &em->flags)) |
3209 | block_start = EXTENT_MAP_HOLE; | |
005efedf FM |
3210 | |
3211 | /* | |
3212 | * If we have a file range that points to a compressed extent | |
3213 | * and it's followed by a consecutive file range that points to | |
3214 | * to the same compressed extent (possibly with a different | |
3215 | * offset and/or length, so it either points to the whole extent | |
3216 | * or only part of it), we must make sure we do not submit a | |
3217 | * single bio to populate the pages for the 2 ranges because | |
3218 | * this makes the compressed extent read zero out the pages | |
3219 | * belonging to the 2nd range. Imagine the following scenario: | |
3220 | * | |
3221 | * File layout | |
3222 | * [0 - 8K] [8K - 24K] | |
3223 | * | | | |
3224 | * | | | |
3225 | * points to extent X, points to extent X, | |
3226 | * offset 4K, length of 8K offset 0, length 16K | |
3227 | * | |
3228 | * [extent X, compressed length = 4K uncompressed length = 16K] | |
3229 | * | |
3230 | * If the bio to read the compressed extent covers both ranges, | |
3231 | * it will decompress extent X into the pages belonging to the | |
3232 | * first range and then it will stop, zeroing out the remaining | |
3233 | * pages that belong to the other range that points to extent X. | |
3234 | * So here we make sure we submit 2 bios, one for the first | |
3235 | * range and another one for the third range. Both will target | |
3236 | * the same physical extent from disk, but we can't currently | |
3237 | * make the compressed bio endio callback populate the pages | |
3238 | * for both ranges because each compressed bio is tightly | |
3239 | * coupled with a single extent map, and each range can have | |
3240 | * an extent map with a different offset value relative to the | |
3241 | * uncompressed data of our extent and different lengths. This | |
3242 | * is a corner case so we prioritize correctness over | |
3243 | * non-optimal behavior (submitting 2 bios for the same extent). | |
3244 | */ | |
3245 | if (test_bit(EXTENT_FLAG_COMPRESSED, &em->flags) && | |
3246 | prev_em_start && *prev_em_start != (u64)-1 && | |
8e928218 | 3247 | *prev_em_start != em->start) |
005efedf FM |
3248 | force_bio_submit = true; |
3249 | ||
3250 | if (prev_em_start) | |
8e928218 | 3251 | *prev_em_start = em->start; |
005efedf | 3252 | |
d1310b2e CM |
3253 | free_extent_map(em); |
3254 | em = NULL; | |
3255 | ||
3256 | /* we've found a hole, just zero and go on */ | |
3257 | if (block_start == EXTENT_MAP_HOLE) { | |
3258 | char *userpage; | |
507903b8 AJ |
3259 | struct extent_state *cached = NULL; |
3260 | ||
7ac687d9 | 3261 | userpage = kmap_atomic(page); |
306e16ce | 3262 | memset(userpage + pg_offset, 0, iosize); |
d1310b2e | 3263 | flush_dcache_page(page); |
7ac687d9 | 3264 | kunmap_atomic(userpage); |
d1310b2e CM |
3265 | |
3266 | set_extent_uptodate(tree, cur, cur + iosize - 1, | |
507903b8 | 3267 | &cached, GFP_NOFS); |
7f042a83 | 3268 | unlock_extent_cached(tree, cur, |
e43bbe5e | 3269 | cur + iosize - 1, &cached); |
d1310b2e | 3270 | cur = cur + iosize; |
306e16ce | 3271 | pg_offset += iosize; |
d1310b2e CM |
3272 | continue; |
3273 | } | |
3274 | /* the get_extent function already copied into the page */ | |
9655d298 CM |
3275 | if (test_range_bit(tree, cur, cur_end, |
3276 | EXTENT_UPTODATE, 1, NULL)) { | |
a1b32a59 | 3277 | check_page_uptodate(tree, page); |
7f042a83 | 3278 | unlock_extent(tree, cur, cur + iosize - 1); |
d1310b2e | 3279 | cur = cur + iosize; |
306e16ce | 3280 | pg_offset += iosize; |
d1310b2e CM |
3281 | continue; |
3282 | } | |
70dec807 CM |
3283 | /* we have an inline extent but it didn't get marked up |
3284 | * to date. Error out | |
3285 | */ | |
3286 | if (block_start == EXTENT_MAP_INLINE) { | |
3287 | SetPageError(page); | |
7f042a83 | 3288 | unlock_extent(tree, cur, cur + iosize - 1); |
70dec807 | 3289 | cur = cur + iosize; |
306e16ce | 3290 | pg_offset += iosize; |
70dec807 CM |
3291 | continue; |
3292 | } | |
d1310b2e | 3293 | |
0ceb34bf | 3294 | ret = submit_extent_page(REQ_OP_READ | read_flags, NULL, |
6273b7f8 | 3295 | page, offset, disk_io_size, |
fa17ed06 | 3296 | pg_offset, bio, |
c8b97818 CM |
3297 | end_bio_extent_readpage, mirror_num, |
3298 | *bio_flags, | |
005efedf FM |
3299 | this_bio_flag, |
3300 | force_bio_submit); | |
c8f2f24b JB |
3301 | if (!ret) { |
3302 | nr++; | |
3303 | *bio_flags = this_bio_flag; | |
3304 | } else { | |
d1310b2e | 3305 | SetPageError(page); |
7f042a83 | 3306 | unlock_extent(tree, cur, cur + iosize - 1); |
baf863b9 | 3307 | goto out; |
edd33c99 | 3308 | } |
d1310b2e | 3309 | cur = cur + iosize; |
306e16ce | 3310 | pg_offset += iosize; |
d1310b2e | 3311 | } |
90a887c9 | 3312 | out: |
d1310b2e CM |
3313 | if (!nr) { |
3314 | if (!PageError(page)) | |
3315 | SetPageUptodate(page); | |
3316 | unlock_page(page); | |
3317 | } | |
baf863b9 | 3318 | return ret; |
d1310b2e CM |
3319 | } |
3320 | ||
e65ef21e | 3321 | static inline void contiguous_readpages(struct extent_io_tree *tree, |
9974090b MX |
3322 | struct page *pages[], int nr_pages, |
3323 | u64 start, u64 end, | |
125bac01 | 3324 | struct extent_map **em_cached, |
d3fac6ba | 3325 | struct bio **bio, |
1f7ad75b | 3326 | unsigned long *bio_flags, |
808f80b4 | 3327 | u64 *prev_em_start) |
9974090b | 3328 | { |
23d31bd4 | 3329 | struct btrfs_inode *inode = BTRFS_I(pages[0]->mapping->host); |
9974090b MX |
3330 | int index; |
3331 | ||
ae6957eb DS |
3332 | ASSERT(tree == &inode->io_tree); |
3333 | ||
b272ae22 | 3334 | btrfs_lock_and_flush_ordered_range(inode, start, end, NULL); |
9974090b MX |
3335 | |
3336 | for (index = 0; index < nr_pages; index++) { | |
4ef77695 | 3337 | __do_readpage(tree, pages[index], btrfs_get_extent, em_cached, |
5e9d3982 | 3338 | bio, 0, bio_flags, REQ_RAHEAD, prev_em_start); |
09cbfeaf | 3339 | put_page(pages[index]); |
9974090b MX |
3340 | } |
3341 | } | |
3342 | ||
9974090b MX |
3343 | static int __extent_read_full_page(struct extent_io_tree *tree, |
3344 | struct page *page, | |
3345 | get_extent_t *get_extent, | |
3346 | struct bio **bio, int mirror_num, | |
f1c77c55 DS |
3347 | unsigned long *bio_flags, |
3348 | unsigned int read_flags) | |
9974090b | 3349 | { |
23d31bd4 | 3350 | struct btrfs_inode *inode = BTRFS_I(page->mapping->host); |
9974090b | 3351 | u64 start = page_offset(page); |
09cbfeaf | 3352 | u64 end = start + PAGE_SIZE - 1; |
9974090b MX |
3353 | int ret; |
3354 | ||
ae6957eb DS |
3355 | ASSERT(tree == &inode->io_tree); |
3356 | ||
b272ae22 | 3357 | btrfs_lock_and_flush_ordered_range(inode, start, end, NULL); |
9974090b | 3358 | |
125bac01 | 3359 | ret = __do_readpage(tree, page, get_extent, NULL, bio, mirror_num, |
1f7ad75b | 3360 | bio_flags, read_flags, NULL); |
9974090b MX |
3361 | return ret; |
3362 | } | |
3363 | ||
71ad38b4 DS |
3364 | int extent_read_full_page(struct page *page, get_extent_t *get_extent, |
3365 | int mirror_num) | |
d1310b2e CM |
3366 | { |
3367 | struct bio *bio = NULL; | |
c8b97818 | 3368 | unsigned long bio_flags = 0; |
71ad38b4 | 3369 | struct extent_io_tree *tree = &BTRFS_I(page->mapping->host)->io_tree; |
d1310b2e CM |
3370 | int ret; |
3371 | ||
8ddc7d9c | 3372 | ret = __extent_read_full_page(tree, page, get_extent, &bio, mirror_num, |
1f7ad75b | 3373 | &bio_flags, 0); |
d1310b2e | 3374 | if (bio) |
1f7ad75b | 3375 | ret = submit_one_bio(bio, mirror_num, bio_flags); |
d1310b2e CM |
3376 | return ret; |
3377 | } | |
d1310b2e | 3378 | |
3d4b9496 | 3379 | static void update_nr_written(struct writeback_control *wbc, |
a9132667 | 3380 | unsigned long nr_written) |
11c8349b CM |
3381 | { |
3382 | wbc->nr_to_write -= nr_written; | |
11c8349b CM |
3383 | } |
3384 | ||
d1310b2e | 3385 | /* |
40f76580 CM |
3386 | * helper for __extent_writepage, doing all of the delayed allocation setup. |
3387 | * | |
5eaad97a | 3388 | * This returns 1 if btrfs_run_delalloc_range function did all the work required |
40f76580 CM |
3389 | * to write the page (copy into inline extent). In this case the IO has |
3390 | * been started and the page is already unlocked. | |
3391 | * | |
3392 | * This returns 0 if all went well (page still locked) | |
3393 | * This returns < 0 if there were errors (page still locked) | |
d1310b2e | 3394 | */ |
40f76580 | 3395 | static noinline_for_stack int writepage_delalloc(struct inode *inode, |
8cc0237a NB |
3396 | struct page *page, struct writeback_control *wbc, |
3397 | u64 delalloc_start, unsigned long *nr_written) | |
40f76580 | 3398 | { |
09cbfeaf | 3399 | u64 page_end = delalloc_start + PAGE_SIZE - 1; |
3522e903 | 3400 | bool found; |
40f76580 CM |
3401 | u64 delalloc_to_write = 0; |
3402 | u64 delalloc_end = 0; | |
3403 | int ret; | |
3404 | int page_started = 0; | |
3405 | ||
40f76580 CM |
3406 | |
3407 | while (delalloc_end < page_end) { | |
9978059b | 3408 | found = find_lock_delalloc_range(inode, page, |
40f76580 | 3409 | &delalloc_start, |
917aacec | 3410 | &delalloc_end); |
3522e903 | 3411 | if (!found) { |
40f76580 CM |
3412 | delalloc_start = delalloc_end + 1; |
3413 | continue; | |
3414 | } | |
5eaad97a NB |
3415 | ret = btrfs_run_delalloc_range(inode, page, delalloc_start, |
3416 | delalloc_end, &page_started, nr_written, wbc); | |
40f76580 CM |
3417 | if (ret) { |
3418 | SetPageError(page); | |
5eaad97a NB |
3419 | /* |
3420 | * btrfs_run_delalloc_range should return < 0 for error | |
3421 | * but just in case, we use > 0 here meaning the IO is | |
3422 | * started, so we don't want to return > 0 unless | |
3423 | * things are going well. | |
40f76580 CM |
3424 | */ |
3425 | ret = ret < 0 ? ret : -EIO; | |
3426 | goto done; | |
3427 | } | |
3428 | /* | |
ea1754a0 KS |
3429 | * delalloc_end is already one less than the total length, so |
3430 | * we don't subtract one from PAGE_SIZE | |
40f76580 CM |
3431 | */ |
3432 | delalloc_to_write += (delalloc_end - delalloc_start + | |
ea1754a0 | 3433 | PAGE_SIZE) >> PAGE_SHIFT; |
40f76580 CM |
3434 | delalloc_start = delalloc_end + 1; |
3435 | } | |
3436 | if (wbc->nr_to_write < delalloc_to_write) { | |
3437 | int thresh = 8192; | |
3438 | ||
3439 | if (delalloc_to_write < thresh * 2) | |
3440 | thresh = delalloc_to_write; | |
3441 | wbc->nr_to_write = min_t(u64, delalloc_to_write, | |
3442 | thresh); | |
3443 | } | |
3444 | ||
3445 | /* did the fill delalloc function already unlock and start | |
3446 | * the IO? | |
3447 | */ | |
3448 | if (page_started) { | |
3449 | /* | |
3450 | * we've unlocked the page, so we can't update | |
3451 | * the mapping's writeback index, just update | |
3452 | * nr_to_write. | |
3453 | */ | |
3454 | wbc->nr_to_write -= *nr_written; | |
3455 | return 1; | |
3456 | } | |
3457 | ||
3458 | ret = 0; | |
3459 | ||
3460 | done: | |
3461 | return ret; | |
3462 | } | |
3463 | ||
3464 | /* | |
3465 | * helper for __extent_writepage. This calls the writepage start hooks, | |
3466 | * and does the loop to map the page into extents and bios. | |
3467 | * | |
3468 | * We return 1 if the IO is started and the page is unlocked, | |
3469 | * 0 if all went well (page still locked) | |
3470 | * < 0 if there were errors (page still locked) | |
3471 | */ | |
3472 | static noinline_for_stack int __extent_writepage_io(struct inode *inode, | |
3473 | struct page *page, | |
3474 | struct writeback_control *wbc, | |
3475 | struct extent_page_data *epd, | |
3476 | loff_t i_size, | |
3477 | unsigned long nr_written, | |
57e5ffeb | 3478 | int *nr_ret) |
d1310b2e | 3479 | { |
45b08405 | 3480 | struct extent_io_tree *tree = &BTRFS_I(inode)->io_tree; |
4eee4fa4 | 3481 | u64 start = page_offset(page); |
09cbfeaf | 3482 | u64 page_end = start + PAGE_SIZE - 1; |
d1310b2e CM |
3483 | u64 end; |
3484 | u64 cur = start; | |
3485 | u64 extent_offset; | |
d1310b2e CM |
3486 | u64 block_start; |
3487 | u64 iosize; | |
d1310b2e | 3488 | struct extent_map *em; |
7f3c74fb | 3489 | size_t pg_offset = 0; |
d1310b2e | 3490 | size_t blocksize; |
40f76580 CM |
3491 | int ret = 0; |
3492 | int nr = 0; | |
57e5ffeb | 3493 | const unsigned int write_flags = wbc_to_write_flags(wbc); |
40f76580 | 3494 | bool compressed; |
c8b97818 | 3495 | |
d75855b4 NB |
3496 | ret = btrfs_writepage_cow_fixup(page, start, page_end); |
3497 | if (ret) { | |
3498 | /* Fixup worker will requeue */ | |
5ab58055 | 3499 | redirty_page_for_writepage(wbc, page); |
d75855b4 NB |
3500 | update_nr_written(wbc, nr_written); |
3501 | unlock_page(page); | |
3502 | return 1; | |
247e743c CM |
3503 | } |
3504 | ||
11c8349b CM |
3505 | /* |
3506 | * we don't want to touch the inode after unlocking the page, | |
3507 | * so we update the mapping writeback index now | |
3508 | */ | |
3d4b9496 | 3509 | update_nr_written(wbc, nr_written + 1); |
771ed689 | 3510 | |
d1310b2e | 3511 | end = page_end; |
d1310b2e CM |
3512 | blocksize = inode->i_sb->s_blocksize; |
3513 | ||
3514 | while (cur <= end) { | |
40f76580 | 3515 | u64 em_end; |
6273b7f8 | 3516 | u64 offset; |
58409edd | 3517 | |
40f76580 | 3518 | if (cur >= i_size) { |
7087a9d8 | 3519 | btrfs_writepage_endio_finish_ordered(page, cur, |
c629732d | 3520 | page_end, 1); |
d1310b2e CM |
3521 | break; |
3522 | } | |
39b07b5d OS |
3523 | em = btrfs_get_extent(BTRFS_I(inode), NULL, 0, cur, |
3524 | end - cur + 1); | |
c704005d | 3525 | if (IS_ERR_OR_NULL(em)) { |
d1310b2e | 3526 | SetPageError(page); |
61391d56 | 3527 | ret = PTR_ERR_OR_ZERO(em); |
d1310b2e CM |
3528 | break; |
3529 | } | |
3530 | ||
3531 | extent_offset = cur - em->start; | |
40f76580 CM |
3532 | em_end = extent_map_end(em); |
3533 | BUG_ON(em_end <= cur); | |
d1310b2e | 3534 | BUG_ON(end < cur); |
40f76580 | 3535 | iosize = min(em_end - cur, end - cur + 1); |
fda2832f | 3536 | iosize = ALIGN(iosize, blocksize); |
6273b7f8 | 3537 | offset = em->block_start + extent_offset; |
d1310b2e | 3538 | block_start = em->block_start; |
c8b97818 | 3539 | compressed = test_bit(EXTENT_FLAG_COMPRESSED, &em->flags); |
d1310b2e CM |
3540 | free_extent_map(em); |
3541 | em = NULL; | |
3542 | ||
c8b97818 CM |
3543 | /* |
3544 | * compressed and inline extents are written through other | |
3545 | * paths in the FS | |
3546 | */ | |
3547 | if (compressed || block_start == EXTENT_MAP_HOLE || | |
d1310b2e | 3548 | block_start == EXTENT_MAP_INLINE) { |
c8b04030 | 3549 | if (compressed) |
c8b97818 | 3550 | nr++; |
c8b04030 OS |
3551 | else |
3552 | btrfs_writepage_endio_finish_ordered(page, cur, | |
3553 | cur + iosize - 1, 1); | |
c8b97818 | 3554 | cur += iosize; |
7f3c74fb | 3555 | pg_offset += iosize; |
d1310b2e CM |
3556 | continue; |
3557 | } | |
c8b97818 | 3558 | |
5cdc84bf | 3559 | btrfs_set_range_writeback(tree, cur, cur + iosize - 1); |
58409edd DS |
3560 | if (!PageWriteback(page)) { |
3561 | btrfs_err(BTRFS_I(inode)->root->fs_info, | |
3562 | "page %lu not writeback, cur %llu end %llu", | |
3563 | page->index, cur, end); | |
d1310b2e | 3564 | } |
7f3c74fb | 3565 | |
0ceb34bf | 3566 | ret = submit_extent_page(REQ_OP_WRITE | write_flags, wbc, |
6273b7f8 | 3567 | page, offset, iosize, pg_offset, |
fa17ed06 | 3568 | &epd->bio, |
58409edd DS |
3569 | end_bio_extent_writepage, |
3570 | 0, 0, 0, false); | |
fe01aa65 | 3571 | if (ret) { |
58409edd | 3572 | SetPageError(page); |
fe01aa65 TK |
3573 | if (PageWriteback(page)) |
3574 | end_page_writeback(page); | |
3575 | } | |
d1310b2e | 3576 | |
d1310b2e | 3577 | cur = cur + iosize; |
7f3c74fb | 3578 | pg_offset += iosize; |
d1310b2e CM |
3579 | nr++; |
3580 | } | |
40f76580 | 3581 | *nr_ret = nr; |
40f76580 CM |
3582 | return ret; |
3583 | } | |
3584 | ||
3585 | /* | |
3586 | * the writepage semantics are similar to regular writepage. extent | |
3587 | * records are inserted to lock ranges in the tree, and as dirty areas | |
3588 | * are found, they are marked writeback. Then the lock bits are removed | |
3589 | * and the end_io handler clears the writeback ranges | |
3065976b QW |
3590 | * |
3591 | * Return 0 if everything goes well. | |
3592 | * Return <0 for error. | |
40f76580 CM |
3593 | */ |
3594 | static int __extent_writepage(struct page *page, struct writeback_control *wbc, | |
aab6e9ed | 3595 | struct extent_page_data *epd) |
40f76580 CM |
3596 | { |
3597 | struct inode *inode = page->mapping->host; | |
40f76580 | 3598 | u64 start = page_offset(page); |
09cbfeaf | 3599 | u64 page_end = start + PAGE_SIZE - 1; |
40f76580 CM |
3600 | int ret; |
3601 | int nr = 0; | |
eb70d222 | 3602 | size_t pg_offset; |
40f76580 | 3603 | loff_t i_size = i_size_read(inode); |
09cbfeaf | 3604 | unsigned long end_index = i_size >> PAGE_SHIFT; |
40f76580 CM |
3605 | unsigned long nr_written = 0; |
3606 | ||
40f76580 CM |
3607 | trace___extent_writepage(page, inode, wbc); |
3608 | ||
3609 | WARN_ON(!PageLocked(page)); | |
3610 | ||
3611 | ClearPageError(page); | |
3612 | ||
7073017a | 3613 | pg_offset = offset_in_page(i_size); |
40f76580 CM |
3614 | if (page->index > end_index || |
3615 | (page->index == end_index && !pg_offset)) { | |
09cbfeaf | 3616 | page->mapping->a_ops->invalidatepage(page, 0, PAGE_SIZE); |
40f76580 CM |
3617 | unlock_page(page); |
3618 | return 0; | |
3619 | } | |
3620 | ||
3621 | if (page->index == end_index) { | |
3622 | char *userpage; | |
3623 | ||
3624 | userpage = kmap_atomic(page); | |
3625 | memset(userpage + pg_offset, 0, | |
09cbfeaf | 3626 | PAGE_SIZE - pg_offset); |
40f76580 CM |
3627 | kunmap_atomic(userpage); |
3628 | flush_dcache_page(page); | |
3629 | } | |
3630 | ||
40f76580 CM |
3631 | set_page_extent_mapped(page); |
3632 | ||
7789a55a | 3633 | if (!epd->extent_locked) { |
8cc0237a | 3634 | ret = writepage_delalloc(inode, page, wbc, start, &nr_written); |
7789a55a | 3635 | if (ret == 1) |
169d2c87 | 3636 | return 0; |
7789a55a NB |
3637 | if (ret) |
3638 | goto done; | |
3639 | } | |
40f76580 CM |
3640 | |
3641 | ret = __extent_writepage_io(inode, page, wbc, epd, | |
57e5ffeb | 3642 | i_size, nr_written, &nr); |
40f76580 | 3643 | if (ret == 1) |
169d2c87 | 3644 | return 0; |
40f76580 | 3645 | |
d1310b2e CM |
3646 | done: |
3647 | if (nr == 0) { | |
3648 | /* make sure the mapping tag for page dirty gets cleared */ | |
3649 | set_page_writeback(page); | |
3650 | end_page_writeback(page); | |
3651 | } | |
61391d56 FM |
3652 | if (PageError(page)) { |
3653 | ret = ret < 0 ? ret : -EIO; | |
3654 | end_extent_writepage(page, ret, start, page_end); | |
3655 | } | |
d1310b2e | 3656 | unlock_page(page); |
3065976b | 3657 | ASSERT(ret <= 0); |
40f76580 | 3658 | return ret; |
d1310b2e CM |
3659 | } |
3660 | ||
fd8b2b61 | 3661 | void wait_on_extent_buffer_writeback(struct extent_buffer *eb) |
0b32f4bb | 3662 | { |
74316201 N |
3663 | wait_on_bit_io(&eb->bflags, EXTENT_BUFFER_WRITEBACK, |
3664 | TASK_UNINTERRUPTIBLE); | |
0b32f4bb JB |
3665 | } |
3666 | ||
18dfa711 FM |
3667 | static void end_extent_buffer_writeback(struct extent_buffer *eb) |
3668 | { | |
3669 | clear_bit(EXTENT_BUFFER_WRITEBACK, &eb->bflags); | |
3670 | smp_mb__after_atomic(); | |
3671 | wake_up_bit(&eb->bflags, EXTENT_BUFFER_WRITEBACK); | |
3672 | } | |
3673 | ||
2e3c2513 QW |
3674 | /* |
3675 | * Lock eb pages and flush the bio if we can't the locks | |
3676 | * | |
3677 | * Return 0 if nothing went wrong | |
3678 | * Return >0 is same as 0, except bio is not submitted | |
3679 | * Return <0 if something went wrong, no page is locked | |
3680 | */ | |
9df76fb5 | 3681 | static noinline_for_stack int lock_extent_buffer_for_io(struct extent_buffer *eb, |
0e378df1 | 3682 | struct extent_page_data *epd) |
0b32f4bb | 3683 | { |
9df76fb5 | 3684 | struct btrfs_fs_info *fs_info = eb->fs_info; |
2e3c2513 | 3685 | int i, num_pages, failed_page_nr; |
0b32f4bb JB |
3686 | int flush = 0; |
3687 | int ret = 0; | |
3688 | ||
3689 | if (!btrfs_try_tree_write_lock(eb)) { | |
f4340622 | 3690 | ret = flush_write_bio(epd); |
2e3c2513 QW |
3691 | if (ret < 0) |
3692 | return ret; | |
3693 | flush = 1; | |
0b32f4bb JB |
3694 | btrfs_tree_lock(eb); |
3695 | } | |
3696 | ||
3697 | if (test_bit(EXTENT_BUFFER_WRITEBACK, &eb->bflags)) { | |
3698 | btrfs_tree_unlock(eb); | |
3699 | if (!epd->sync_io) | |
3700 | return 0; | |
3701 | if (!flush) { | |
f4340622 | 3702 | ret = flush_write_bio(epd); |
2e3c2513 QW |
3703 | if (ret < 0) |
3704 | return ret; | |
0b32f4bb JB |
3705 | flush = 1; |
3706 | } | |
a098d8e8 CM |
3707 | while (1) { |
3708 | wait_on_extent_buffer_writeback(eb); | |
3709 | btrfs_tree_lock(eb); | |
3710 | if (!test_bit(EXTENT_BUFFER_WRITEBACK, &eb->bflags)) | |
3711 | break; | |
0b32f4bb | 3712 | btrfs_tree_unlock(eb); |
0b32f4bb JB |
3713 | } |
3714 | } | |
3715 | ||
51561ffe JB |
3716 | /* |
3717 | * We need to do this to prevent races in people who check if the eb is | |
3718 | * under IO since we can end up having no IO bits set for a short period | |
3719 | * of time. | |
3720 | */ | |
3721 | spin_lock(&eb->refs_lock); | |
0b32f4bb JB |
3722 | if (test_and_clear_bit(EXTENT_BUFFER_DIRTY, &eb->bflags)) { |
3723 | set_bit(EXTENT_BUFFER_WRITEBACK, &eb->bflags); | |
51561ffe | 3724 | spin_unlock(&eb->refs_lock); |
0b32f4bb | 3725 | btrfs_set_header_flag(eb, BTRFS_HEADER_FLAG_WRITTEN); |
104b4e51 NB |
3726 | percpu_counter_add_batch(&fs_info->dirty_metadata_bytes, |
3727 | -eb->len, | |
3728 | fs_info->dirty_metadata_batch); | |
0b32f4bb | 3729 | ret = 1; |
51561ffe JB |
3730 | } else { |
3731 | spin_unlock(&eb->refs_lock); | |
0b32f4bb JB |
3732 | } |
3733 | ||
3734 | btrfs_tree_unlock(eb); | |
3735 | ||
3736 | if (!ret) | |
3737 | return ret; | |
3738 | ||
65ad0104 | 3739 | num_pages = num_extent_pages(eb); |
0b32f4bb | 3740 | for (i = 0; i < num_pages; i++) { |
fb85fc9a | 3741 | struct page *p = eb->pages[i]; |
0b32f4bb JB |
3742 | |
3743 | if (!trylock_page(p)) { | |
3744 | if (!flush) { | |
18dfa711 FM |
3745 | int err; |
3746 | ||
3747 | err = flush_write_bio(epd); | |
3748 | if (err < 0) { | |
3749 | ret = err; | |
2e3c2513 QW |
3750 | failed_page_nr = i; |
3751 | goto err_unlock; | |
3752 | } | |
0b32f4bb JB |
3753 | flush = 1; |
3754 | } | |
3755 | lock_page(p); | |
3756 | } | |
3757 | } | |
3758 | ||
3759 | return ret; | |
2e3c2513 QW |
3760 | err_unlock: |
3761 | /* Unlock already locked pages */ | |
3762 | for (i = 0; i < failed_page_nr; i++) | |
3763 | unlock_page(eb->pages[i]); | |
18dfa711 FM |
3764 | /* |
3765 | * Clear EXTENT_BUFFER_WRITEBACK and wake up anyone waiting on it. | |
3766 | * Also set back EXTENT_BUFFER_DIRTY so future attempts to this eb can | |
3767 | * be made and undo everything done before. | |
3768 | */ | |
3769 | btrfs_tree_lock(eb); | |
3770 | spin_lock(&eb->refs_lock); | |
3771 | set_bit(EXTENT_BUFFER_DIRTY, &eb->bflags); | |
3772 | end_extent_buffer_writeback(eb); | |
3773 | spin_unlock(&eb->refs_lock); | |
3774 | percpu_counter_add_batch(&fs_info->dirty_metadata_bytes, eb->len, | |
3775 | fs_info->dirty_metadata_batch); | |
3776 | btrfs_clear_header_flag(eb, BTRFS_HEADER_FLAG_WRITTEN); | |
3777 | btrfs_tree_unlock(eb); | |
2e3c2513 | 3778 | return ret; |
0b32f4bb JB |
3779 | } |
3780 | ||
656f30db FM |
3781 | static void set_btree_ioerr(struct page *page) |
3782 | { | |
3783 | struct extent_buffer *eb = (struct extent_buffer *)page->private; | |
eb5b64f1 | 3784 | struct btrfs_fs_info *fs_info; |
656f30db FM |
3785 | |
3786 | SetPageError(page); | |
3787 | if (test_and_set_bit(EXTENT_BUFFER_WRITE_ERR, &eb->bflags)) | |
3788 | return; | |
3789 | ||
eb5b64f1 DZ |
3790 | /* |
3791 | * If we error out, we should add back the dirty_metadata_bytes | |
3792 | * to make it consistent. | |
3793 | */ | |
3794 | fs_info = eb->fs_info; | |
3795 | percpu_counter_add_batch(&fs_info->dirty_metadata_bytes, | |
3796 | eb->len, fs_info->dirty_metadata_batch); | |
3797 | ||
656f30db FM |
3798 | /* |
3799 | * If writeback for a btree extent that doesn't belong to a log tree | |
3800 | * failed, increment the counter transaction->eb_write_errors. | |
3801 | * We do this because while the transaction is running and before it's | |
3802 | * committing (when we call filemap_fdata[write|wait]_range against | |
3803 | * the btree inode), we might have | |
3804 | * btree_inode->i_mapping->a_ops->writepages() called by the VM - if it | |
3805 | * returns an error or an error happens during writeback, when we're | |
3806 | * committing the transaction we wouldn't know about it, since the pages | |
3807 | * can be no longer dirty nor marked anymore for writeback (if a | |
3808 | * subsequent modification to the extent buffer didn't happen before the | |
3809 | * transaction commit), which makes filemap_fdata[write|wait]_range not | |
3810 | * able to find the pages tagged with SetPageError at transaction | |
3811 | * commit time. So if this happens we must abort the transaction, | |
3812 | * otherwise we commit a super block with btree roots that point to | |
3813 | * btree nodes/leafs whose content on disk is invalid - either garbage | |
3814 | * or the content of some node/leaf from a past generation that got | |
3815 | * cowed or deleted and is no longer valid. | |
3816 | * | |
3817 | * Note: setting AS_EIO/AS_ENOSPC in the btree inode's i_mapping would | |
3818 | * not be enough - we need to distinguish between log tree extents vs | |
3819 | * non-log tree extents, and the next filemap_fdatawait_range() call | |
3820 | * will catch and clear such errors in the mapping - and that call might | |
3821 | * be from a log sync and not from a transaction commit. Also, checking | |
3822 | * for the eb flag EXTENT_BUFFER_WRITE_ERR at transaction commit time is | |
3823 | * not done and would not be reliable - the eb might have been released | |
3824 | * from memory and reading it back again means that flag would not be | |
3825 | * set (since it's a runtime flag, not persisted on disk). | |
3826 | * | |
3827 | * Using the flags below in the btree inode also makes us achieve the | |
3828 | * goal of AS_EIO/AS_ENOSPC when writepages() returns success, started | |
3829 | * writeback for all dirty pages and before filemap_fdatawait_range() | |
3830 | * is called, the writeback for all dirty pages had already finished | |
3831 | * with errors - because we were not using AS_EIO/AS_ENOSPC, | |
3832 | * filemap_fdatawait_range() would return success, as it could not know | |
3833 | * that writeback errors happened (the pages were no longer tagged for | |
3834 | * writeback). | |
3835 | */ | |
3836 | switch (eb->log_index) { | |
3837 | case -1: | |
afcdd129 | 3838 | set_bit(BTRFS_FS_BTREE_ERR, &eb->fs_info->flags); |
656f30db FM |
3839 | break; |
3840 | case 0: | |
afcdd129 | 3841 | set_bit(BTRFS_FS_LOG1_ERR, &eb->fs_info->flags); |
656f30db FM |
3842 | break; |
3843 | case 1: | |
afcdd129 | 3844 | set_bit(BTRFS_FS_LOG2_ERR, &eb->fs_info->flags); |
656f30db FM |
3845 | break; |
3846 | default: | |
3847 | BUG(); /* unexpected, logic error */ | |
3848 | } | |
3849 | } | |
3850 | ||
4246a0b6 | 3851 | static void end_bio_extent_buffer_writepage(struct bio *bio) |
0b32f4bb | 3852 | { |
2c30c71b | 3853 | struct bio_vec *bvec; |
0b32f4bb | 3854 | struct extent_buffer *eb; |
2b070cfe | 3855 | int done; |
6dc4f100 | 3856 | struct bvec_iter_all iter_all; |
0b32f4bb | 3857 | |
c09abff8 | 3858 | ASSERT(!bio_flagged(bio, BIO_CLONED)); |
2b070cfe | 3859 | bio_for_each_segment_all(bvec, bio, iter_all) { |
0b32f4bb JB |
3860 | struct page *page = bvec->bv_page; |
3861 | ||
0b32f4bb JB |
3862 | eb = (struct extent_buffer *)page->private; |
3863 | BUG_ON(!eb); | |
3864 | done = atomic_dec_and_test(&eb->io_pages); | |
3865 | ||
4e4cbee9 | 3866 | if (bio->bi_status || |
4246a0b6 | 3867 | test_bit(EXTENT_BUFFER_WRITE_ERR, &eb->bflags)) { |
0b32f4bb | 3868 | ClearPageUptodate(page); |
656f30db | 3869 | set_btree_ioerr(page); |
0b32f4bb JB |
3870 | } |
3871 | ||
3872 | end_page_writeback(page); | |
3873 | ||
3874 | if (!done) | |
3875 | continue; | |
3876 | ||
3877 | end_extent_buffer_writeback(eb); | |
2c30c71b | 3878 | } |
0b32f4bb JB |
3879 | |
3880 | bio_put(bio); | |
0b32f4bb JB |
3881 | } |
3882 | ||
0e378df1 | 3883 | static noinline_for_stack int write_one_eb(struct extent_buffer *eb, |
0b32f4bb JB |
3884 | struct writeback_control *wbc, |
3885 | struct extent_page_data *epd) | |
3886 | { | |
0b32f4bb | 3887 | u64 offset = eb->start; |
851cd173 | 3888 | u32 nritems; |
cc5e31a4 | 3889 | int i, num_pages; |
851cd173 | 3890 | unsigned long start, end; |
ff40adf7 | 3891 | unsigned int write_flags = wbc_to_write_flags(wbc) | REQ_META; |
d7dbe9e7 | 3892 | int ret = 0; |
0b32f4bb | 3893 | |
656f30db | 3894 | clear_bit(EXTENT_BUFFER_WRITE_ERR, &eb->bflags); |
65ad0104 | 3895 | num_pages = num_extent_pages(eb); |
0b32f4bb | 3896 | atomic_set(&eb->io_pages, num_pages); |
de0022b9 | 3897 | |
851cd173 LB |
3898 | /* set btree blocks beyond nritems with 0 to avoid stale content. */ |
3899 | nritems = btrfs_header_nritems(eb); | |
3eb548ee | 3900 | if (btrfs_header_level(eb) > 0) { |
3eb548ee LB |
3901 | end = btrfs_node_key_ptr_offset(nritems); |
3902 | ||
b159fa28 | 3903 | memzero_extent_buffer(eb, end, eb->len - end); |
851cd173 LB |
3904 | } else { |
3905 | /* | |
3906 | * leaf: | |
3907 | * header 0 1 2 .. N ... data_N .. data_2 data_1 data_0 | |
3908 | */ | |
3909 | start = btrfs_item_nr_offset(nritems); | |
8f881e8c | 3910 | end = BTRFS_LEAF_DATA_OFFSET + leaf_data_end(eb); |
b159fa28 | 3911 | memzero_extent_buffer(eb, start, end - start); |
3eb548ee LB |
3912 | } |
3913 | ||
0b32f4bb | 3914 | for (i = 0; i < num_pages; i++) { |
fb85fc9a | 3915 | struct page *p = eb->pages[i]; |
0b32f4bb JB |
3916 | |
3917 | clear_page_dirty_for_io(p); | |
3918 | set_page_writeback(p); | |
0ceb34bf | 3919 | ret = submit_extent_page(REQ_OP_WRITE | write_flags, wbc, |
fa17ed06 | 3920 | p, offset, PAGE_SIZE, 0, |
c2df8bb4 | 3921 | &epd->bio, |
1f7ad75b | 3922 | end_bio_extent_buffer_writepage, |
18fdc679 | 3923 | 0, 0, 0, false); |
0b32f4bb | 3924 | if (ret) { |
656f30db | 3925 | set_btree_ioerr(p); |
fe01aa65 TK |
3926 | if (PageWriteback(p)) |
3927 | end_page_writeback(p); | |
0b32f4bb JB |
3928 | if (atomic_sub_and_test(num_pages - i, &eb->io_pages)) |
3929 | end_extent_buffer_writeback(eb); | |
3930 | ret = -EIO; | |
3931 | break; | |
3932 | } | |
09cbfeaf | 3933 | offset += PAGE_SIZE; |
3d4b9496 | 3934 | update_nr_written(wbc, 1); |
0b32f4bb JB |
3935 | unlock_page(p); |
3936 | } | |
3937 | ||
3938 | if (unlikely(ret)) { | |
3939 | for (; i < num_pages; i++) { | |
bbf65cf0 | 3940 | struct page *p = eb->pages[i]; |
81465028 | 3941 | clear_page_dirty_for_io(p); |
0b32f4bb JB |
3942 | unlock_page(p); |
3943 | } | |
3944 | } | |
3945 | ||
3946 | return ret; | |
3947 | } | |
3948 | ||
3949 | int btree_write_cache_pages(struct address_space *mapping, | |
3950 | struct writeback_control *wbc) | |
3951 | { | |
0b32f4bb JB |
3952 | struct extent_buffer *eb, *prev_eb = NULL; |
3953 | struct extent_page_data epd = { | |
3954 | .bio = NULL, | |
0b32f4bb JB |
3955 | .extent_locked = 0, |
3956 | .sync_io = wbc->sync_mode == WB_SYNC_ALL, | |
3957 | }; | |
3958 | int ret = 0; | |
3959 | int done = 0; | |
3960 | int nr_to_write_done = 0; | |
3961 | struct pagevec pvec; | |
3962 | int nr_pages; | |
3963 | pgoff_t index; | |
3964 | pgoff_t end; /* Inclusive */ | |
3965 | int scanned = 0; | |
10bbd235 | 3966 | xa_mark_t tag; |
0b32f4bb | 3967 | |
86679820 | 3968 | pagevec_init(&pvec); |
0b32f4bb JB |
3969 | if (wbc->range_cyclic) { |
3970 | index = mapping->writeback_index; /* Start from prev offset */ | |
3971 | end = -1; | |
556755a8 JB |
3972 | /* |
3973 | * Start from the beginning does not need to cycle over the | |
3974 | * range, mark it as scanned. | |
3975 | */ | |
3976 | scanned = (index == 0); | |
0b32f4bb | 3977 | } else { |
09cbfeaf KS |
3978 | index = wbc->range_start >> PAGE_SHIFT; |
3979 | end = wbc->range_end >> PAGE_SHIFT; | |
0b32f4bb JB |
3980 | scanned = 1; |
3981 | } | |
3982 | if (wbc->sync_mode == WB_SYNC_ALL) | |
3983 | tag = PAGECACHE_TAG_TOWRITE; | |
3984 | else | |
3985 | tag = PAGECACHE_TAG_DIRTY; | |
3986 | retry: | |
3987 | if (wbc->sync_mode == WB_SYNC_ALL) | |
3988 | tag_pages_for_writeback(mapping, index, end); | |
3989 | while (!done && !nr_to_write_done && (index <= end) && | |
4006f437 | 3990 | (nr_pages = pagevec_lookup_range_tag(&pvec, mapping, &index, end, |
67fd707f | 3991 | tag))) { |
0b32f4bb JB |
3992 | unsigned i; |
3993 | ||
0b32f4bb JB |
3994 | for (i = 0; i < nr_pages; i++) { |
3995 | struct page *page = pvec.pages[i]; | |
3996 | ||
3997 | if (!PagePrivate(page)) | |
3998 | continue; | |
3999 | ||
b5bae261 JB |
4000 | spin_lock(&mapping->private_lock); |
4001 | if (!PagePrivate(page)) { | |
4002 | spin_unlock(&mapping->private_lock); | |
4003 | continue; | |
4004 | } | |
4005 | ||
0b32f4bb | 4006 | eb = (struct extent_buffer *)page->private; |
b5bae261 JB |
4007 | |
4008 | /* | |
4009 | * Shouldn't happen and normally this would be a BUG_ON | |
4010 | * but no sense in crashing the users box for something | |
4011 | * we can survive anyway. | |
4012 | */ | |
fae7f21c | 4013 | if (WARN_ON(!eb)) { |
b5bae261 | 4014 | spin_unlock(&mapping->private_lock); |
0b32f4bb JB |
4015 | continue; |
4016 | } | |
4017 | ||
b5bae261 JB |
4018 | if (eb == prev_eb) { |
4019 | spin_unlock(&mapping->private_lock); | |
0b32f4bb | 4020 | continue; |
b5bae261 | 4021 | } |
0b32f4bb | 4022 | |
b5bae261 JB |
4023 | ret = atomic_inc_not_zero(&eb->refs); |
4024 | spin_unlock(&mapping->private_lock); | |
4025 | if (!ret) | |
0b32f4bb | 4026 | continue; |
0b32f4bb JB |
4027 | |
4028 | prev_eb = eb; | |
9df76fb5 | 4029 | ret = lock_extent_buffer_for_io(eb, &epd); |
0b32f4bb JB |
4030 | if (!ret) { |
4031 | free_extent_buffer(eb); | |
4032 | continue; | |
0607eb1d FM |
4033 | } else if (ret < 0) { |
4034 | done = 1; | |
4035 | free_extent_buffer(eb); | |
4036 | break; | |
0b32f4bb JB |
4037 | } |
4038 | ||
0ab02063 | 4039 | ret = write_one_eb(eb, wbc, &epd); |
0b32f4bb JB |
4040 | if (ret) { |
4041 | done = 1; | |
4042 | free_extent_buffer(eb); | |
4043 | break; | |
4044 | } | |
4045 | free_extent_buffer(eb); | |
4046 | ||
4047 | /* | |
4048 | * the filesystem may choose to bump up nr_to_write. | |
4049 | * We have to make sure to honor the new nr_to_write | |
4050 | * at any time | |
4051 | */ | |
4052 | nr_to_write_done = wbc->nr_to_write <= 0; | |
4053 | } | |
4054 | pagevec_release(&pvec); | |
4055 | cond_resched(); | |
4056 | } | |
4057 | if (!scanned && !done) { | |
4058 | /* | |
4059 | * We hit the last page and there is more work to be done: wrap | |
4060 | * back to the start of the file | |
4061 | */ | |
4062 | scanned = 1; | |
4063 | index = 0; | |
4064 | goto retry; | |
4065 | } | |
2b952eea QW |
4066 | ASSERT(ret <= 0); |
4067 | if (ret < 0) { | |
4068 | end_write_bio(&epd, ret); | |
4069 | return ret; | |
4070 | } | |
4071 | ret = flush_write_bio(&epd); | |
0b32f4bb JB |
4072 | return ret; |
4073 | } | |
4074 | ||
d1310b2e | 4075 | /** |
4bef0848 | 4076 | * write_cache_pages - walk the list of dirty pages of the given address space and write all of them. |
d1310b2e CM |
4077 | * @mapping: address space structure to write |
4078 | * @wbc: subtract the number of written pages from *@wbc->nr_to_write | |
935db853 | 4079 | * @data: data passed to __extent_writepage function |
d1310b2e CM |
4080 | * |
4081 | * If a page is already under I/O, write_cache_pages() skips it, even | |
4082 | * if it's dirty. This is desirable behaviour for memory-cleaning writeback, | |
4083 | * but it is INCORRECT for data-integrity system calls such as fsync(). fsync() | |
4084 | * and msync() need to guarantee that all the data which was dirty at the time | |
4085 | * the call was made get new I/O started against them. If wbc->sync_mode is | |
4086 | * WB_SYNC_ALL then we were called for data integrity and we must wait for | |
4087 | * existing IO to complete. | |
4088 | */ | |
4242b64a | 4089 | static int extent_write_cache_pages(struct address_space *mapping, |
4bef0848 | 4090 | struct writeback_control *wbc, |
aab6e9ed | 4091 | struct extent_page_data *epd) |
d1310b2e | 4092 | { |
7fd1a3f7 | 4093 | struct inode *inode = mapping->host; |
d1310b2e CM |
4094 | int ret = 0; |
4095 | int done = 0; | |
f85d7d6c | 4096 | int nr_to_write_done = 0; |
d1310b2e CM |
4097 | struct pagevec pvec; |
4098 | int nr_pages; | |
4099 | pgoff_t index; | |
4100 | pgoff_t end; /* Inclusive */ | |
a9132667 LB |
4101 | pgoff_t done_index; |
4102 | int range_whole = 0; | |
d1310b2e | 4103 | int scanned = 0; |
10bbd235 | 4104 | xa_mark_t tag; |
d1310b2e | 4105 | |
7fd1a3f7 JB |
4106 | /* |
4107 | * We have to hold onto the inode so that ordered extents can do their | |
4108 | * work when the IO finishes. The alternative to this is failing to add | |
4109 | * an ordered extent if the igrab() fails there and that is a huge pain | |
4110 | * to deal with, so instead just hold onto the inode throughout the | |
4111 | * writepages operation. If it fails here we are freeing up the inode | |
4112 | * anyway and we'd rather not waste our time writing out stuff that is | |
4113 | * going to be truncated anyway. | |
4114 | */ | |
4115 | if (!igrab(inode)) | |
4116 | return 0; | |
4117 | ||
86679820 | 4118 | pagevec_init(&pvec); |
d1310b2e CM |
4119 | if (wbc->range_cyclic) { |
4120 | index = mapping->writeback_index; /* Start from prev offset */ | |
4121 | end = -1; | |
556755a8 JB |
4122 | /* |
4123 | * Start from the beginning does not need to cycle over the | |
4124 | * range, mark it as scanned. | |
4125 | */ | |
4126 | scanned = (index == 0); | |
d1310b2e | 4127 | } else { |
09cbfeaf KS |
4128 | index = wbc->range_start >> PAGE_SHIFT; |
4129 | end = wbc->range_end >> PAGE_SHIFT; | |
a9132667 LB |
4130 | if (wbc->range_start == 0 && wbc->range_end == LLONG_MAX) |
4131 | range_whole = 1; | |
d1310b2e CM |
4132 | scanned = 1; |
4133 | } | |
3cd24c69 EL |
4134 | |
4135 | /* | |
4136 | * We do the tagged writepage as long as the snapshot flush bit is set | |
4137 | * and we are the first one who do the filemap_flush() on this inode. | |
4138 | * | |
4139 | * The nr_to_write == LONG_MAX is needed to make sure other flushers do | |
4140 | * not race in and drop the bit. | |
4141 | */ | |
4142 | if (range_whole && wbc->nr_to_write == LONG_MAX && | |
4143 | test_and_clear_bit(BTRFS_INODE_SNAPSHOT_FLUSH, | |
4144 | &BTRFS_I(inode)->runtime_flags)) | |
4145 | wbc->tagged_writepages = 1; | |
4146 | ||
4147 | if (wbc->sync_mode == WB_SYNC_ALL || wbc->tagged_writepages) | |
f7aaa06b JB |
4148 | tag = PAGECACHE_TAG_TOWRITE; |
4149 | else | |
4150 | tag = PAGECACHE_TAG_DIRTY; | |
d1310b2e | 4151 | retry: |
3cd24c69 | 4152 | if (wbc->sync_mode == WB_SYNC_ALL || wbc->tagged_writepages) |
f7aaa06b | 4153 | tag_pages_for_writeback(mapping, index, end); |
a9132667 | 4154 | done_index = index; |
f85d7d6c | 4155 | while (!done && !nr_to_write_done && (index <= end) && |
67fd707f JK |
4156 | (nr_pages = pagevec_lookup_range_tag(&pvec, mapping, |
4157 | &index, end, tag))) { | |
d1310b2e CM |
4158 | unsigned i; |
4159 | ||
d1310b2e CM |
4160 | for (i = 0; i < nr_pages; i++) { |
4161 | struct page *page = pvec.pages[i]; | |
4162 | ||
f7bddf1e | 4163 | done_index = page->index + 1; |
d1310b2e | 4164 | /* |
b93b0163 MW |
4165 | * At this point we hold neither the i_pages lock nor |
4166 | * the page lock: the page may be truncated or | |
4167 | * invalidated (changing page->mapping to NULL), | |
4168 | * or even swizzled back from swapper_space to | |
4169 | * tmpfs file mapping | |
d1310b2e | 4170 | */ |
c8f2f24b | 4171 | if (!trylock_page(page)) { |
f4340622 QW |
4172 | ret = flush_write_bio(epd); |
4173 | BUG_ON(ret < 0); | |
c8f2f24b | 4174 | lock_page(page); |
01d658f2 | 4175 | } |
d1310b2e CM |
4176 | |
4177 | if (unlikely(page->mapping != mapping)) { | |
4178 | unlock_page(page); | |
4179 | continue; | |
4180 | } | |
4181 | ||
d2c3f4f6 | 4182 | if (wbc->sync_mode != WB_SYNC_NONE) { |
f4340622 QW |
4183 | if (PageWriteback(page)) { |
4184 | ret = flush_write_bio(epd); | |
4185 | BUG_ON(ret < 0); | |
4186 | } | |
d1310b2e | 4187 | wait_on_page_writeback(page); |
d2c3f4f6 | 4188 | } |
d1310b2e CM |
4189 | |
4190 | if (PageWriteback(page) || | |
4191 | !clear_page_dirty_for_io(page)) { | |
4192 | unlock_page(page); | |
4193 | continue; | |
4194 | } | |
4195 | ||
aab6e9ed | 4196 | ret = __extent_writepage(page, wbc, epd); |
a9132667 | 4197 | if (ret < 0) { |
a9132667 LB |
4198 | done = 1; |
4199 | break; | |
4200 | } | |
f85d7d6c CM |
4201 | |
4202 | /* | |
4203 | * the filesystem may choose to bump up nr_to_write. | |
4204 | * We have to make sure to honor the new nr_to_write | |
4205 | * at any time | |
4206 | */ | |
4207 | nr_to_write_done = wbc->nr_to_write <= 0; | |
d1310b2e CM |
4208 | } |
4209 | pagevec_release(&pvec); | |
4210 | cond_resched(); | |
4211 | } | |
894b36e3 | 4212 | if (!scanned && !done) { |
d1310b2e CM |
4213 | /* |
4214 | * We hit the last page and there is more work to be done: wrap | |
4215 | * back to the start of the file | |
4216 | */ | |
4217 | scanned = 1; | |
4218 | index = 0; | |
42ffb0bf JB |
4219 | |
4220 | /* | |
4221 | * If we're looping we could run into a page that is locked by a | |
4222 | * writer and that writer could be waiting on writeback for a | |
4223 | * page in our current bio, and thus deadlock, so flush the | |
4224 | * write bio here. | |
4225 | */ | |
4226 | ret = flush_write_bio(epd); | |
4227 | if (!ret) | |
4228 | goto retry; | |
d1310b2e | 4229 | } |
a9132667 LB |
4230 | |
4231 | if (wbc->range_cyclic || (wbc->nr_to_write > 0 && range_whole)) | |
4232 | mapping->writeback_index = done_index; | |
4233 | ||
7fd1a3f7 | 4234 | btrfs_add_delayed_iput(inode); |
894b36e3 | 4235 | return ret; |
d1310b2e | 4236 | } |
d1310b2e | 4237 | |
0a9b0e53 | 4238 | int extent_write_full_page(struct page *page, struct writeback_control *wbc) |
d1310b2e CM |
4239 | { |
4240 | int ret; | |
d1310b2e CM |
4241 | struct extent_page_data epd = { |
4242 | .bio = NULL, | |
771ed689 | 4243 | .extent_locked = 0, |
ffbd517d | 4244 | .sync_io = wbc->sync_mode == WB_SYNC_ALL, |
d1310b2e | 4245 | }; |
d1310b2e | 4246 | |
d1310b2e | 4247 | ret = __extent_writepage(page, wbc, &epd); |
3065976b QW |
4248 | ASSERT(ret <= 0); |
4249 | if (ret < 0) { | |
4250 | end_write_bio(&epd, ret); | |
4251 | return ret; | |
4252 | } | |
d1310b2e | 4253 | |
3065976b QW |
4254 | ret = flush_write_bio(&epd); |
4255 | ASSERT(ret <= 0); | |
d1310b2e CM |
4256 | return ret; |
4257 | } | |
d1310b2e | 4258 | |
5e3ee236 | 4259 | int extent_write_locked_range(struct inode *inode, u64 start, u64 end, |
771ed689 CM |
4260 | int mode) |
4261 | { | |
4262 | int ret = 0; | |
4263 | struct address_space *mapping = inode->i_mapping; | |
4264 | struct page *page; | |
09cbfeaf KS |
4265 | unsigned long nr_pages = (end - start + PAGE_SIZE) >> |
4266 | PAGE_SHIFT; | |
771ed689 CM |
4267 | |
4268 | struct extent_page_data epd = { | |
4269 | .bio = NULL, | |
771ed689 | 4270 | .extent_locked = 1, |
ffbd517d | 4271 | .sync_io = mode == WB_SYNC_ALL, |
771ed689 CM |
4272 | }; |
4273 | struct writeback_control wbc_writepages = { | |
771ed689 | 4274 | .sync_mode = mode, |
771ed689 CM |
4275 | .nr_to_write = nr_pages * 2, |
4276 | .range_start = start, | |
4277 | .range_end = end + 1, | |
ec39f769 CM |
4278 | /* We're called from an async helper function */ |
4279 | .punt_to_cgroup = 1, | |
4280 | .no_cgroup_owner = 1, | |
771ed689 CM |
4281 | }; |
4282 | ||
dbb70bec | 4283 | wbc_attach_fdatawrite_inode(&wbc_writepages, inode); |
d397712b | 4284 | while (start <= end) { |
09cbfeaf | 4285 | page = find_get_page(mapping, start >> PAGE_SHIFT); |
771ed689 CM |
4286 | if (clear_page_dirty_for_io(page)) |
4287 | ret = __extent_writepage(page, &wbc_writepages, &epd); | |
4288 | else { | |
7087a9d8 | 4289 | btrfs_writepage_endio_finish_ordered(page, start, |
c629732d | 4290 | start + PAGE_SIZE - 1, 1); |
771ed689 CM |
4291 | unlock_page(page); |
4292 | } | |
09cbfeaf KS |
4293 | put_page(page); |
4294 | start += PAGE_SIZE; | |
771ed689 CM |
4295 | } |
4296 | ||
02c6db4f | 4297 | ASSERT(ret <= 0); |
dbb70bec CM |
4298 | if (ret == 0) |
4299 | ret = flush_write_bio(&epd); | |
4300 | else | |
02c6db4f | 4301 | end_write_bio(&epd, ret); |
dbb70bec CM |
4302 | |
4303 | wbc_detach_inode(&wbc_writepages); | |
771ed689 CM |
4304 | return ret; |
4305 | } | |
d1310b2e | 4306 | |
8ae225a8 | 4307 | int extent_writepages(struct address_space *mapping, |
d1310b2e CM |
4308 | struct writeback_control *wbc) |
4309 | { | |
4310 | int ret = 0; | |
4311 | struct extent_page_data epd = { | |
4312 | .bio = NULL, | |
771ed689 | 4313 | .extent_locked = 0, |
ffbd517d | 4314 | .sync_io = wbc->sync_mode == WB_SYNC_ALL, |
d1310b2e CM |
4315 | }; |
4316 | ||
935db853 | 4317 | ret = extent_write_cache_pages(mapping, wbc, &epd); |
a2a72fbd QW |
4318 | ASSERT(ret <= 0); |
4319 | if (ret < 0) { | |
4320 | end_write_bio(&epd, ret); | |
4321 | return ret; | |
4322 | } | |
4323 | ret = flush_write_bio(&epd); | |
d1310b2e CM |
4324 | return ret; |
4325 | } | |
d1310b2e | 4326 | |
2a3ff0ad NB |
4327 | int extent_readpages(struct address_space *mapping, struct list_head *pages, |
4328 | unsigned nr_pages) | |
d1310b2e CM |
4329 | { |
4330 | struct bio *bio = NULL; | |
c8b97818 | 4331 | unsigned long bio_flags = 0; |
67c9684f | 4332 | struct page *pagepool[16]; |
125bac01 | 4333 | struct extent_map *em_cached = NULL; |
2a3ff0ad | 4334 | struct extent_io_tree *tree = &BTRFS_I(mapping->host)->io_tree; |
67c9684f | 4335 | int nr = 0; |
808f80b4 | 4336 | u64 prev_em_start = (u64)-1; |
d1310b2e | 4337 | |
61ed3a14 | 4338 | while (!list_empty(pages)) { |
e65ef21e NB |
4339 | u64 contig_end = 0; |
4340 | ||
61ed3a14 | 4341 | for (nr = 0; nr < ARRAY_SIZE(pagepool) && !list_empty(pages);) { |
f86196ea | 4342 | struct page *page = lru_to_page(pages); |
d1310b2e | 4343 | |
61ed3a14 NB |
4344 | prefetchw(&page->flags); |
4345 | list_del(&page->lru); | |
4346 | if (add_to_page_cache_lru(page, mapping, page->index, | |
4347 | readahead_gfp_mask(mapping))) { | |
4348 | put_page(page); | |
e65ef21e | 4349 | break; |
61ed3a14 NB |
4350 | } |
4351 | ||
4352 | pagepool[nr++] = page; | |
e65ef21e | 4353 | contig_end = page_offset(page) + PAGE_SIZE - 1; |
d1310b2e | 4354 | } |
67c9684f | 4355 | |
e65ef21e NB |
4356 | if (nr) { |
4357 | u64 contig_start = page_offset(pagepool[0]); | |
4358 | ||
4359 | ASSERT(contig_start + nr * PAGE_SIZE - 1 == contig_end); | |
4360 | ||
4361 | contiguous_readpages(tree, pagepool, nr, contig_start, | |
4362 | contig_end, &em_cached, &bio, &bio_flags, | |
4363 | &prev_em_start); | |
4364 | } | |
d1310b2e | 4365 | } |
67c9684f | 4366 | |
125bac01 MX |
4367 | if (em_cached) |
4368 | free_extent_map(em_cached); | |
4369 | ||
d1310b2e | 4370 | if (bio) |
1f7ad75b | 4371 | return submit_one_bio(bio, 0, bio_flags); |
d1310b2e CM |
4372 | return 0; |
4373 | } | |
d1310b2e CM |
4374 | |
4375 | /* | |
4376 | * basic invalidatepage code, this waits on any locked or writeback | |
4377 | * ranges corresponding to the page, and then deletes any extent state | |
4378 | * records from the tree | |
4379 | */ | |
4380 | int extent_invalidatepage(struct extent_io_tree *tree, | |
4381 | struct page *page, unsigned long offset) | |
4382 | { | |
2ac55d41 | 4383 | struct extent_state *cached_state = NULL; |
4eee4fa4 | 4384 | u64 start = page_offset(page); |
09cbfeaf | 4385 | u64 end = start + PAGE_SIZE - 1; |
d1310b2e CM |
4386 | size_t blocksize = page->mapping->host->i_sb->s_blocksize; |
4387 | ||
fda2832f | 4388 | start += ALIGN(offset, blocksize); |
d1310b2e CM |
4389 | if (start > end) |
4390 | return 0; | |
4391 | ||
ff13db41 | 4392 | lock_extent_bits(tree, start, end, &cached_state); |
1edbb734 | 4393 | wait_on_page_writeback(page); |
e182163d OS |
4394 | clear_extent_bit(tree, start, end, EXTENT_LOCKED | EXTENT_DELALLOC | |
4395 | EXTENT_DO_ACCOUNTING, 1, 1, &cached_state); | |
d1310b2e CM |
4396 | return 0; |
4397 | } | |
d1310b2e | 4398 | |
7b13b7b1 CM |
4399 | /* |
4400 | * a helper for releasepage, this tests for areas of the page that | |
4401 | * are locked or under IO and drops the related state bits if it is safe | |
4402 | * to drop the page. | |
4403 | */ | |
29c68b2d | 4404 | static int try_release_extent_state(struct extent_io_tree *tree, |
48a3b636 | 4405 | struct page *page, gfp_t mask) |
7b13b7b1 | 4406 | { |
4eee4fa4 | 4407 | u64 start = page_offset(page); |
09cbfeaf | 4408 | u64 end = start + PAGE_SIZE - 1; |
7b13b7b1 CM |
4409 | int ret = 1; |
4410 | ||
8882679e | 4411 | if (test_range_bit(tree, start, end, EXTENT_LOCKED, 0, NULL)) { |
7b13b7b1 | 4412 | ret = 0; |
8882679e | 4413 | } else { |
11ef160f CM |
4414 | /* |
4415 | * at this point we can safely clear everything except the | |
4416 | * locked bit and the nodatasum bit | |
4417 | */ | |
66b0c887 | 4418 | ret = __clear_extent_bit(tree, start, end, |
11ef160f | 4419 | ~(EXTENT_LOCKED | EXTENT_NODATASUM), |
66b0c887 | 4420 | 0, 0, NULL, mask, NULL); |
e3f24cc5 CM |
4421 | |
4422 | /* if clear_extent_bit failed for enomem reasons, | |
4423 | * we can't allow the release to continue. | |
4424 | */ | |
4425 | if (ret < 0) | |
4426 | ret = 0; | |
4427 | else | |
4428 | ret = 1; | |
7b13b7b1 CM |
4429 | } |
4430 | return ret; | |
4431 | } | |
7b13b7b1 | 4432 | |
d1310b2e CM |
4433 | /* |
4434 | * a helper for releasepage. As long as there are no locked extents | |
4435 | * in the range corresponding to the page, both state records and extent | |
4436 | * map records are removed | |
4437 | */ | |
477a30ba | 4438 | int try_release_extent_mapping(struct page *page, gfp_t mask) |
d1310b2e CM |
4439 | { |
4440 | struct extent_map *em; | |
4eee4fa4 | 4441 | u64 start = page_offset(page); |
09cbfeaf | 4442 | u64 end = start + PAGE_SIZE - 1; |
bd3599a0 FM |
4443 | struct btrfs_inode *btrfs_inode = BTRFS_I(page->mapping->host); |
4444 | struct extent_io_tree *tree = &btrfs_inode->io_tree; | |
4445 | struct extent_map_tree *map = &btrfs_inode->extent_tree; | |
7b13b7b1 | 4446 | |
d0164adc | 4447 | if (gfpflags_allow_blocking(mask) && |
ee22184b | 4448 | page->mapping->host->i_size > SZ_16M) { |
39b5637f | 4449 | u64 len; |
70dec807 | 4450 | while (start <= end) { |
39b5637f | 4451 | len = end - start + 1; |
890871be | 4452 | write_lock(&map->lock); |
39b5637f | 4453 | em = lookup_extent_mapping(map, start, len); |
285190d9 | 4454 | if (!em) { |
890871be | 4455 | write_unlock(&map->lock); |
70dec807 CM |
4456 | break; |
4457 | } | |
7f3c74fb CM |
4458 | if (test_bit(EXTENT_FLAG_PINNED, &em->flags) || |
4459 | em->start != start) { | |
890871be | 4460 | write_unlock(&map->lock); |
70dec807 CM |
4461 | free_extent_map(em); |
4462 | break; | |
4463 | } | |
4464 | if (!test_range_bit(tree, em->start, | |
4465 | extent_map_end(em) - 1, | |
4e586ca3 | 4466 | EXTENT_LOCKED, 0, NULL)) { |
bd3599a0 FM |
4467 | set_bit(BTRFS_INODE_NEEDS_FULL_SYNC, |
4468 | &btrfs_inode->runtime_flags); | |
70dec807 CM |
4469 | remove_extent_mapping(map, em); |
4470 | /* once for the rb tree */ | |
4471 | free_extent_map(em); | |
4472 | } | |
4473 | start = extent_map_end(em); | |
890871be | 4474 | write_unlock(&map->lock); |
70dec807 CM |
4475 | |
4476 | /* once for us */ | |
d1310b2e CM |
4477 | free_extent_map(em); |
4478 | } | |
d1310b2e | 4479 | } |
29c68b2d | 4480 | return try_release_extent_state(tree, page, mask); |
d1310b2e | 4481 | } |
d1310b2e | 4482 | |
ec29ed5b CM |
4483 | /* |
4484 | * helper function for fiemap, which doesn't want to see any holes. | |
4485 | * This maps until we find something past 'last' | |
4486 | */ | |
4487 | static struct extent_map *get_extent_skip_holes(struct inode *inode, | |
e3350e16 | 4488 | u64 offset, u64 last) |
ec29ed5b | 4489 | { |
da17066c | 4490 | u64 sectorsize = btrfs_inode_sectorsize(inode); |
ec29ed5b CM |
4491 | struct extent_map *em; |
4492 | u64 len; | |
4493 | ||
4494 | if (offset >= last) | |
4495 | return NULL; | |
4496 | ||
67871254 | 4497 | while (1) { |
ec29ed5b CM |
4498 | len = last - offset; |
4499 | if (len == 0) | |
4500 | break; | |
fda2832f | 4501 | len = ALIGN(len, sectorsize); |
4ab47a8d | 4502 | em = btrfs_get_extent_fiemap(BTRFS_I(inode), offset, len); |
c704005d | 4503 | if (IS_ERR_OR_NULL(em)) |
ec29ed5b CM |
4504 | return em; |
4505 | ||
4506 | /* if this isn't a hole return it */ | |
4a2d25cd | 4507 | if (em->block_start != EXTENT_MAP_HOLE) |
ec29ed5b | 4508 | return em; |
ec29ed5b CM |
4509 | |
4510 | /* this is a hole, advance to the next extent */ | |
4511 | offset = extent_map_end(em); | |
4512 | free_extent_map(em); | |
4513 | if (offset >= last) | |
4514 | break; | |
4515 | } | |
4516 | return NULL; | |
4517 | } | |
4518 | ||
4751832d QW |
4519 | /* |
4520 | * To cache previous fiemap extent | |
4521 | * | |
4522 | * Will be used for merging fiemap extent | |
4523 | */ | |
4524 | struct fiemap_cache { | |
4525 | u64 offset; | |
4526 | u64 phys; | |
4527 | u64 len; | |
4528 | u32 flags; | |
4529 | bool cached; | |
4530 | }; | |
4531 | ||
4532 | /* | |
4533 | * Helper to submit fiemap extent. | |
4534 | * | |
4535 | * Will try to merge current fiemap extent specified by @offset, @phys, | |
4536 | * @len and @flags with cached one. | |
4537 | * And only when we fails to merge, cached one will be submitted as | |
4538 | * fiemap extent. | |
4539 | * | |
4540 | * Return value is the same as fiemap_fill_next_extent(). | |
4541 | */ | |
4542 | static int emit_fiemap_extent(struct fiemap_extent_info *fieinfo, | |
4543 | struct fiemap_cache *cache, | |
4544 | u64 offset, u64 phys, u64 len, u32 flags) | |
4545 | { | |
4546 | int ret = 0; | |
4547 | ||
4548 | if (!cache->cached) | |
4549 | goto assign; | |
4550 | ||
4551 | /* | |
4552 | * Sanity check, extent_fiemap() should have ensured that new | |
52042d8e | 4553 | * fiemap extent won't overlap with cached one. |
4751832d QW |
4554 | * Not recoverable. |
4555 | * | |
4556 | * NOTE: Physical address can overlap, due to compression | |
4557 | */ | |
4558 | if (cache->offset + cache->len > offset) { | |
4559 | WARN_ON(1); | |
4560 | return -EINVAL; | |
4561 | } | |
4562 | ||
4563 | /* | |
4564 | * Only merges fiemap extents if | |
4565 | * 1) Their logical addresses are continuous | |
4566 | * | |
4567 | * 2) Their physical addresses are continuous | |
4568 | * So truly compressed (physical size smaller than logical size) | |
4569 | * extents won't get merged with each other | |
4570 | * | |
4571 | * 3) Share same flags except FIEMAP_EXTENT_LAST | |
4572 | * So regular extent won't get merged with prealloc extent | |
4573 | */ | |
4574 | if (cache->offset + cache->len == offset && | |
4575 | cache->phys + cache->len == phys && | |
4576 | (cache->flags & ~FIEMAP_EXTENT_LAST) == | |
4577 | (flags & ~FIEMAP_EXTENT_LAST)) { | |
4578 | cache->len += len; | |
4579 | cache->flags |= flags; | |
4580 | goto try_submit_last; | |
4581 | } | |
4582 | ||
4583 | /* Not mergeable, need to submit cached one */ | |
4584 | ret = fiemap_fill_next_extent(fieinfo, cache->offset, cache->phys, | |
4585 | cache->len, cache->flags); | |
4586 | cache->cached = false; | |
4587 | if (ret) | |
4588 | return ret; | |
4589 | assign: | |
4590 | cache->cached = true; | |
4591 | cache->offset = offset; | |
4592 | cache->phys = phys; | |
4593 | cache->len = len; | |
4594 | cache->flags = flags; | |
4595 | try_submit_last: | |
4596 | if (cache->flags & FIEMAP_EXTENT_LAST) { | |
4597 | ret = fiemap_fill_next_extent(fieinfo, cache->offset, | |
4598 | cache->phys, cache->len, cache->flags); | |
4599 | cache->cached = false; | |
4600 | } | |
4601 | return ret; | |
4602 | } | |
4603 | ||
4604 | /* | |
848c23b7 | 4605 | * Emit last fiemap cache |
4751832d | 4606 | * |
848c23b7 QW |
4607 | * The last fiemap cache may still be cached in the following case: |
4608 | * 0 4k 8k | |
4609 | * |<- Fiemap range ->| | |
4610 | * |<------------ First extent ----------->| | |
4611 | * | |
4612 | * In this case, the first extent range will be cached but not emitted. | |
4613 | * So we must emit it before ending extent_fiemap(). | |
4751832d | 4614 | */ |
5c5aff98 | 4615 | static int emit_last_fiemap_cache(struct fiemap_extent_info *fieinfo, |
848c23b7 | 4616 | struct fiemap_cache *cache) |
4751832d QW |
4617 | { |
4618 | int ret; | |
4619 | ||
4620 | if (!cache->cached) | |
4621 | return 0; | |
4622 | ||
4751832d QW |
4623 | ret = fiemap_fill_next_extent(fieinfo, cache->offset, cache->phys, |
4624 | cache->len, cache->flags); | |
4625 | cache->cached = false; | |
4626 | if (ret > 0) | |
4627 | ret = 0; | |
4628 | return ret; | |
4629 | } | |
4630 | ||
1506fcc8 | 4631 | int extent_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, |
2135fb9b | 4632 | __u64 start, __u64 len) |
1506fcc8 | 4633 | { |
975f84fe | 4634 | int ret = 0; |
1506fcc8 YS |
4635 | u64 off = start; |
4636 | u64 max = start + len; | |
4637 | u32 flags = 0; | |
975f84fe JB |
4638 | u32 found_type; |
4639 | u64 last; | |
ec29ed5b | 4640 | u64 last_for_get_extent = 0; |
1506fcc8 | 4641 | u64 disko = 0; |
ec29ed5b | 4642 | u64 isize = i_size_read(inode); |
975f84fe | 4643 | struct btrfs_key found_key; |
1506fcc8 | 4644 | struct extent_map *em = NULL; |
2ac55d41 | 4645 | struct extent_state *cached_state = NULL; |
975f84fe | 4646 | struct btrfs_path *path; |
dc046b10 | 4647 | struct btrfs_root *root = BTRFS_I(inode)->root; |
4751832d | 4648 | struct fiemap_cache cache = { 0 }; |
5911c8fe DS |
4649 | struct ulist *roots; |
4650 | struct ulist *tmp_ulist; | |
1506fcc8 | 4651 | int end = 0; |
ec29ed5b CM |
4652 | u64 em_start = 0; |
4653 | u64 em_len = 0; | |
4654 | u64 em_end = 0; | |
1506fcc8 YS |
4655 | |
4656 | if (len == 0) | |
4657 | return -EINVAL; | |
4658 | ||
975f84fe JB |
4659 | path = btrfs_alloc_path(); |
4660 | if (!path) | |
4661 | return -ENOMEM; | |
4662 | path->leave_spinning = 1; | |
4663 | ||
5911c8fe DS |
4664 | roots = ulist_alloc(GFP_KERNEL); |
4665 | tmp_ulist = ulist_alloc(GFP_KERNEL); | |
4666 | if (!roots || !tmp_ulist) { | |
4667 | ret = -ENOMEM; | |
4668 | goto out_free_ulist; | |
4669 | } | |
4670 | ||
da17066c JM |
4671 | start = round_down(start, btrfs_inode_sectorsize(inode)); |
4672 | len = round_up(max, btrfs_inode_sectorsize(inode)) - start; | |
4d479cf0 | 4673 | |
ec29ed5b CM |
4674 | /* |
4675 | * lookup the last file extent. We're not using i_size here | |
4676 | * because there might be preallocation past i_size | |
4677 | */ | |
f85b7379 DS |
4678 | ret = btrfs_lookup_file_extent(NULL, root, path, |
4679 | btrfs_ino(BTRFS_I(inode)), -1, 0); | |
975f84fe | 4680 | if (ret < 0) { |
5911c8fe | 4681 | goto out_free_ulist; |
2d324f59 LB |
4682 | } else { |
4683 | WARN_ON(!ret); | |
4684 | if (ret == 1) | |
4685 | ret = 0; | |
975f84fe | 4686 | } |
2d324f59 | 4687 | |
975f84fe | 4688 | path->slots[0]--; |
975f84fe | 4689 | btrfs_item_key_to_cpu(path->nodes[0], &found_key, path->slots[0]); |
962a298f | 4690 | found_type = found_key.type; |
975f84fe | 4691 | |
ec29ed5b | 4692 | /* No extents, but there might be delalloc bits */ |
4a0cc7ca | 4693 | if (found_key.objectid != btrfs_ino(BTRFS_I(inode)) || |
975f84fe | 4694 | found_type != BTRFS_EXTENT_DATA_KEY) { |
ec29ed5b CM |
4695 | /* have to trust i_size as the end */ |
4696 | last = (u64)-1; | |
4697 | last_for_get_extent = isize; | |
4698 | } else { | |
4699 | /* | |
4700 | * remember the start of the last extent. There are a | |
4701 | * bunch of different factors that go into the length of the | |
4702 | * extent, so its much less complex to remember where it started | |
4703 | */ | |
4704 | last = found_key.offset; | |
4705 | last_for_get_extent = last + 1; | |
975f84fe | 4706 | } |
fe09e16c | 4707 | btrfs_release_path(path); |
975f84fe | 4708 | |
ec29ed5b CM |
4709 | /* |
4710 | * we might have some extents allocated but more delalloc past those | |
4711 | * extents. so, we trust isize unless the start of the last extent is | |
4712 | * beyond isize | |
4713 | */ | |
4714 | if (last < isize) { | |
4715 | last = (u64)-1; | |
4716 | last_for_get_extent = isize; | |
4717 | } | |
4718 | ||
ff13db41 | 4719 | lock_extent_bits(&BTRFS_I(inode)->io_tree, start, start + len - 1, |
d0082371 | 4720 | &cached_state); |
ec29ed5b | 4721 | |
e3350e16 | 4722 | em = get_extent_skip_holes(inode, start, last_for_get_extent); |
1506fcc8 YS |
4723 | if (!em) |
4724 | goto out; | |
4725 | if (IS_ERR(em)) { | |
4726 | ret = PTR_ERR(em); | |
4727 | goto out; | |
4728 | } | |
975f84fe | 4729 | |
1506fcc8 | 4730 | while (!end) { |
b76bb701 | 4731 | u64 offset_in_extent = 0; |
ea8efc74 CM |
4732 | |
4733 | /* break if the extent we found is outside the range */ | |
4734 | if (em->start >= max || extent_map_end(em) < off) | |
4735 | break; | |
4736 | ||
4737 | /* | |
4738 | * get_extent may return an extent that starts before our | |
4739 | * requested range. We have to make sure the ranges | |
4740 | * we return to fiemap always move forward and don't | |
4741 | * overlap, so adjust the offsets here | |
4742 | */ | |
4743 | em_start = max(em->start, off); | |
1506fcc8 | 4744 | |
ea8efc74 CM |
4745 | /* |
4746 | * record the offset from the start of the extent | |
b76bb701 JB |
4747 | * for adjusting the disk offset below. Only do this if the |
4748 | * extent isn't compressed since our in ram offset may be past | |
4749 | * what we have actually allocated on disk. | |
ea8efc74 | 4750 | */ |
b76bb701 JB |
4751 | if (!test_bit(EXTENT_FLAG_COMPRESSED, &em->flags)) |
4752 | offset_in_extent = em_start - em->start; | |
ec29ed5b | 4753 | em_end = extent_map_end(em); |
ea8efc74 | 4754 | em_len = em_end - em_start; |
1506fcc8 | 4755 | flags = 0; |
f0986318 FM |
4756 | if (em->block_start < EXTENT_MAP_LAST_BYTE) |
4757 | disko = em->block_start + offset_in_extent; | |
4758 | else | |
4759 | disko = 0; | |
1506fcc8 | 4760 | |
ea8efc74 CM |
4761 | /* |
4762 | * bump off for our next call to get_extent | |
4763 | */ | |
4764 | off = extent_map_end(em); | |
4765 | if (off >= max) | |
4766 | end = 1; | |
4767 | ||
93dbfad7 | 4768 | if (em->block_start == EXTENT_MAP_LAST_BYTE) { |
1506fcc8 YS |
4769 | end = 1; |
4770 | flags |= FIEMAP_EXTENT_LAST; | |
93dbfad7 | 4771 | } else if (em->block_start == EXTENT_MAP_INLINE) { |
1506fcc8 YS |
4772 | flags |= (FIEMAP_EXTENT_DATA_INLINE | |
4773 | FIEMAP_EXTENT_NOT_ALIGNED); | |
93dbfad7 | 4774 | } else if (em->block_start == EXTENT_MAP_DELALLOC) { |
1506fcc8 YS |
4775 | flags |= (FIEMAP_EXTENT_DELALLOC | |
4776 | FIEMAP_EXTENT_UNKNOWN); | |
dc046b10 JB |
4777 | } else if (fieinfo->fi_extents_max) { |
4778 | u64 bytenr = em->block_start - | |
4779 | (em->start - em->orig_start); | |
fe09e16c | 4780 | |
fe09e16c LB |
4781 | /* |
4782 | * As btrfs supports shared space, this information | |
4783 | * can be exported to userspace tools via | |
dc046b10 JB |
4784 | * flag FIEMAP_EXTENT_SHARED. If fi_extents_max == 0 |
4785 | * then we're just getting a count and we can skip the | |
4786 | * lookup stuff. | |
fe09e16c | 4787 | */ |
bb739cf0 EN |
4788 | ret = btrfs_check_shared(root, |
4789 | btrfs_ino(BTRFS_I(inode)), | |
5911c8fe | 4790 | bytenr, roots, tmp_ulist); |
dc046b10 | 4791 | if (ret < 0) |
fe09e16c | 4792 | goto out_free; |
dc046b10 | 4793 | if (ret) |
fe09e16c | 4794 | flags |= FIEMAP_EXTENT_SHARED; |
dc046b10 | 4795 | ret = 0; |
1506fcc8 YS |
4796 | } |
4797 | if (test_bit(EXTENT_FLAG_COMPRESSED, &em->flags)) | |
4798 | flags |= FIEMAP_EXTENT_ENCODED; | |
0d2b2372 JB |
4799 | if (test_bit(EXTENT_FLAG_PREALLOC, &em->flags)) |
4800 | flags |= FIEMAP_EXTENT_UNWRITTEN; | |
1506fcc8 | 4801 | |
1506fcc8 YS |
4802 | free_extent_map(em); |
4803 | em = NULL; | |
ec29ed5b CM |
4804 | if ((em_start >= last) || em_len == (u64)-1 || |
4805 | (last == (u64)-1 && isize <= em_end)) { | |
1506fcc8 YS |
4806 | flags |= FIEMAP_EXTENT_LAST; |
4807 | end = 1; | |
4808 | } | |
4809 | ||
ec29ed5b | 4810 | /* now scan forward to see if this is really the last extent. */ |
e3350e16 | 4811 | em = get_extent_skip_holes(inode, off, last_for_get_extent); |
ec29ed5b CM |
4812 | if (IS_ERR(em)) { |
4813 | ret = PTR_ERR(em); | |
4814 | goto out; | |
4815 | } | |
4816 | if (!em) { | |
975f84fe JB |
4817 | flags |= FIEMAP_EXTENT_LAST; |
4818 | end = 1; | |
4819 | } | |
4751832d QW |
4820 | ret = emit_fiemap_extent(fieinfo, &cache, em_start, disko, |
4821 | em_len, flags); | |
26e726af CS |
4822 | if (ret) { |
4823 | if (ret == 1) | |
4824 | ret = 0; | |
ec29ed5b | 4825 | goto out_free; |
26e726af | 4826 | } |
1506fcc8 YS |
4827 | } |
4828 | out_free: | |
4751832d | 4829 | if (!ret) |
5c5aff98 | 4830 | ret = emit_last_fiemap_cache(fieinfo, &cache); |
1506fcc8 YS |
4831 | free_extent_map(em); |
4832 | out: | |
a52f4cd2 | 4833 | unlock_extent_cached(&BTRFS_I(inode)->io_tree, start, start + len - 1, |
e43bbe5e | 4834 | &cached_state); |
5911c8fe DS |
4835 | |
4836 | out_free_ulist: | |
e02d48ea | 4837 | btrfs_free_path(path); |
5911c8fe DS |
4838 | ulist_free(roots); |
4839 | ulist_free(tmp_ulist); | |
1506fcc8 YS |
4840 | return ret; |
4841 | } | |
4842 | ||
727011e0 CM |
4843 | static void __free_extent_buffer(struct extent_buffer *eb) |
4844 | { | |
6d49ba1b | 4845 | btrfs_leak_debug_del(&eb->leak_list); |
727011e0 CM |
4846 | kmem_cache_free(extent_buffer_cache, eb); |
4847 | } | |
4848 | ||
a26e8c9f | 4849 | int extent_buffer_under_io(struct extent_buffer *eb) |
db7f3436 JB |
4850 | { |
4851 | return (atomic_read(&eb->io_pages) || | |
4852 | test_bit(EXTENT_BUFFER_WRITEBACK, &eb->bflags) || | |
4853 | test_bit(EXTENT_BUFFER_DIRTY, &eb->bflags)); | |
4854 | } | |
4855 | ||
4856 | /* | |
55ac0139 | 4857 | * Release all pages attached to the extent buffer. |
db7f3436 | 4858 | */ |
55ac0139 | 4859 | static void btrfs_release_extent_buffer_pages(struct extent_buffer *eb) |
db7f3436 | 4860 | { |
d64766fd NB |
4861 | int i; |
4862 | int num_pages; | |
b0132a3b | 4863 | int mapped = !test_bit(EXTENT_BUFFER_UNMAPPED, &eb->bflags); |
db7f3436 JB |
4864 | |
4865 | BUG_ON(extent_buffer_under_io(eb)); | |
4866 | ||
d64766fd NB |
4867 | num_pages = num_extent_pages(eb); |
4868 | for (i = 0; i < num_pages; i++) { | |
4869 | struct page *page = eb->pages[i]; | |
db7f3436 | 4870 | |
5d2361db FL |
4871 | if (!page) |
4872 | continue; | |
4873 | if (mapped) | |
db7f3436 | 4874 | spin_lock(&page->mapping->private_lock); |
5d2361db FL |
4875 | /* |
4876 | * We do this since we'll remove the pages after we've | |
4877 | * removed the eb from the radix tree, so we could race | |
4878 | * and have this page now attached to the new eb. So | |
4879 | * only clear page_private if it's still connected to | |
4880 | * this eb. | |
4881 | */ | |
4882 | if (PagePrivate(page) && | |
4883 | page->private == (unsigned long)eb) { | |
4884 | BUG_ON(test_bit(EXTENT_BUFFER_DIRTY, &eb->bflags)); | |
4885 | BUG_ON(PageDirty(page)); | |
4886 | BUG_ON(PageWriteback(page)); | |
db7f3436 | 4887 | /* |
5d2361db FL |
4888 | * We need to make sure we haven't be attached |
4889 | * to a new eb. | |
db7f3436 | 4890 | */ |
5d2361db FL |
4891 | ClearPagePrivate(page); |
4892 | set_page_private(page, 0); | |
4893 | /* One for the page private */ | |
09cbfeaf | 4894 | put_page(page); |
db7f3436 | 4895 | } |
5d2361db FL |
4896 | |
4897 | if (mapped) | |
4898 | spin_unlock(&page->mapping->private_lock); | |
4899 | ||
01327610 | 4900 | /* One for when we allocated the page */ |
09cbfeaf | 4901 | put_page(page); |
d64766fd | 4902 | } |
db7f3436 JB |
4903 | } |
4904 | ||
4905 | /* | |
4906 | * Helper for releasing the extent buffer. | |
4907 | */ | |
4908 | static inline void btrfs_release_extent_buffer(struct extent_buffer *eb) | |
4909 | { | |
55ac0139 | 4910 | btrfs_release_extent_buffer_pages(eb); |
db7f3436 JB |
4911 | __free_extent_buffer(eb); |
4912 | } | |
4913 | ||
f28491e0 JB |
4914 | static struct extent_buffer * |
4915 | __alloc_extent_buffer(struct btrfs_fs_info *fs_info, u64 start, | |
23d79d81 | 4916 | unsigned long len) |
d1310b2e CM |
4917 | { |
4918 | struct extent_buffer *eb = NULL; | |
4919 | ||
d1b5c567 | 4920 | eb = kmem_cache_zalloc(extent_buffer_cache, GFP_NOFS|__GFP_NOFAIL); |
d1310b2e CM |
4921 | eb->start = start; |
4922 | eb->len = len; | |
f28491e0 | 4923 | eb->fs_info = fs_info; |
815a51c7 | 4924 | eb->bflags = 0; |
bd681513 | 4925 | rwlock_init(&eb->lock); |
bd681513 | 4926 | atomic_set(&eb->blocking_readers, 0); |
06297d8c | 4927 | eb->blocking_writers = 0; |
ed1b4ed7 | 4928 | eb->lock_nested = false; |
bd681513 CM |
4929 | init_waitqueue_head(&eb->write_lock_wq); |
4930 | init_waitqueue_head(&eb->read_lock_wq); | |
b4ce94de | 4931 | |
6d49ba1b ES |
4932 | btrfs_leak_debug_add(&eb->leak_list, &buffers); |
4933 | ||
3083ee2e | 4934 | spin_lock_init(&eb->refs_lock); |
d1310b2e | 4935 | atomic_set(&eb->refs, 1); |
0b32f4bb | 4936 | atomic_set(&eb->io_pages, 0); |
727011e0 | 4937 | |
b8dae313 DS |
4938 | /* |
4939 | * Sanity checks, currently the maximum is 64k covered by 16x 4k pages | |
4940 | */ | |
4941 | BUILD_BUG_ON(BTRFS_MAX_METADATA_BLOCKSIZE | |
4942 | > MAX_INLINE_EXTENT_BUFFER_SIZE); | |
4943 | BUG_ON(len > MAX_INLINE_EXTENT_BUFFER_SIZE); | |
d1310b2e | 4944 | |
843ccf9f | 4945 | #ifdef CONFIG_BTRFS_DEBUG |
f3dc24c5 | 4946 | eb->spinning_writers = 0; |
afd495a8 | 4947 | atomic_set(&eb->spinning_readers, 0); |
5c9c799a | 4948 | atomic_set(&eb->read_locks, 0); |
00801ae4 | 4949 | eb->write_locks = 0; |
843ccf9f DS |
4950 | #endif |
4951 | ||
d1310b2e CM |
4952 | return eb; |
4953 | } | |
4954 | ||
815a51c7 JS |
4955 | struct extent_buffer *btrfs_clone_extent_buffer(struct extent_buffer *src) |
4956 | { | |
cc5e31a4 | 4957 | int i; |
815a51c7 JS |
4958 | struct page *p; |
4959 | struct extent_buffer *new; | |
cc5e31a4 | 4960 | int num_pages = num_extent_pages(src); |
815a51c7 | 4961 | |
3f556f78 | 4962 | new = __alloc_extent_buffer(src->fs_info, src->start, src->len); |
815a51c7 JS |
4963 | if (new == NULL) |
4964 | return NULL; | |
4965 | ||
4966 | for (i = 0; i < num_pages; i++) { | |
9ec72677 | 4967 | p = alloc_page(GFP_NOFS); |
db7f3436 JB |
4968 | if (!p) { |
4969 | btrfs_release_extent_buffer(new); | |
4970 | return NULL; | |
4971 | } | |
815a51c7 JS |
4972 | attach_extent_buffer_page(new, p); |
4973 | WARN_ON(PageDirty(p)); | |
4974 | SetPageUptodate(p); | |
4975 | new->pages[i] = p; | |
fba1acf9 | 4976 | copy_page(page_address(p), page_address(src->pages[i])); |
815a51c7 JS |
4977 | } |
4978 | ||
815a51c7 | 4979 | set_bit(EXTENT_BUFFER_UPTODATE, &new->bflags); |
b0132a3b | 4980 | set_bit(EXTENT_BUFFER_UNMAPPED, &new->bflags); |
815a51c7 JS |
4981 | |
4982 | return new; | |
4983 | } | |
4984 | ||
0f331229 OS |
4985 | struct extent_buffer *__alloc_dummy_extent_buffer(struct btrfs_fs_info *fs_info, |
4986 | u64 start, unsigned long len) | |
815a51c7 JS |
4987 | { |
4988 | struct extent_buffer *eb; | |
cc5e31a4 DS |
4989 | int num_pages; |
4990 | int i; | |
815a51c7 | 4991 | |
3f556f78 | 4992 | eb = __alloc_extent_buffer(fs_info, start, len); |
815a51c7 JS |
4993 | if (!eb) |
4994 | return NULL; | |
4995 | ||
65ad0104 | 4996 | num_pages = num_extent_pages(eb); |
815a51c7 | 4997 | for (i = 0; i < num_pages; i++) { |
9ec72677 | 4998 | eb->pages[i] = alloc_page(GFP_NOFS); |
815a51c7 JS |
4999 | if (!eb->pages[i]) |
5000 | goto err; | |
5001 | } | |
5002 | set_extent_buffer_uptodate(eb); | |
5003 | btrfs_set_header_nritems(eb, 0); | |
b0132a3b | 5004 | set_bit(EXTENT_BUFFER_UNMAPPED, &eb->bflags); |
815a51c7 JS |
5005 | |
5006 | return eb; | |
5007 | err: | |
84167d19 SB |
5008 | for (; i > 0; i--) |
5009 | __free_page(eb->pages[i - 1]); | |
815a51c7 JS |
5010 | __free_extent_buffer(eb); |
5011 | return NULL; | |
5012 | } | |
5013 | ||
0f331229 | 5014 | struct extent_buffer *alloc_dummy_extent_buffer(struct btrfs_fs_info *fs_info, |
da17066c | 5015 | u64 start) |
0f331229 | 5016 | { |
da17066c | 5017 | return __alloc_dummy_extent_buffer(fs_info, start, fs_info->nodesize); |
0f331229 OS |
5018 | } |
5019 | ||
0b32f4bb JB |
5020 | static void check_buffer_tree_ref(struct extent_buffer *eb) |
5021 | { | |
242e18c7 | 5022 | int refs; |
0b32f4bb JB |
5023 | /* the ref bit is tricky. We have to make sure it is set |
5024 | * if we have the buffer dirty. Otherwise the | |
5025 | * code to free a buffer can end up dropping a dirty | |
5026 | * page | |
5027 | * | |
5028 | * Once the ref bit is set, it won't go away while the | |
5029 | * buffer is dirty or in writeback, and it also won't | |
5030 | * go away while we have the reference count on the | |
5031 | * eb bumped. | |
5032 | * | |
5033 | * We can't just set the ref bit without bumping the | |
5034 | * ref on the eb because free_extent_buffer might | |
5035 | * see the ref bit and try to clear it. If this happens | |
5036 | * free_extent_buffer might end up dropping our original | |
5037 | * ref by mistake and freeing the page before we are able | |
5038 | * to add one more ref. | |
5039 | * | |
5040 | * So bump the ref count first, then set the bit. If someone | |
5041 | * beat us to it, drop the ref we added. | |
5042 | */ | |
242e18c7 CM |
5043 | refs = atomic_read(&eb->refs); |
5044 | if (refs >= 2 && test_bit(EXTENT_BUFFER_TREE_REF, &eb->bflags)) | |
5045 | return; | |
5046 | ||
594831c4 JB |
5047 | spin_lock(&eb->refs_lock); |
5048 | if (!test_and_set_bit(EXTENT_BUFFER_TREE_REF, &eb->bflags)) | |
0b32f4bb | 5049 | atomic_inc(&eb->refs); |
594831c4 | 5050 | spin_unlock(&eb->refs_lock); |
0b32f4bb JB |
5051 | } |
5052 | ||
2457aec6 MG |
5053 | static void mark_extent_buffer_accessed(struct extent_buffer *eb, |
5054 | struct page *accessed) | |
5df4235e | 5055 | { |
cc5e31a4 | 5056 | int num_pages, i; |
5df4235e | 5057 | |
0b32f4bb JB |
5058 | check_buffer_tree_ref(eb); |
5059 | ||
65ad0104 | 5060 | num_pages = num_extent_pages(eb); |
5df4235e | 5061 | for (i = 0; i < num_pages; i++) { |
fb85fc9a DS |
5062 | struct page *p = eb->pages[i]; |
5063 | ||
2457aec6 MG |
5064 | if (p != accessed) |
5065 | mark_page_accessed(p); | |
5df4235e JB |
5066 | } |
5067 | } | |
5068 | ||
f28491e0 JB |
5069 | struct extent_buffer *find_extent_buffer(struct btrfs_fs_info *fs_info, |
5070 | u64 start) | |
452c75c3 CS |
5071 | { |
5072 | struct extent_buffer *eb; | |
5073 | ||
5074 | rcu_read_lock(); | |
f28491e0 | 5075 | eb = radix_tree_lookup(&fs_info->buffer_radix, |
09cbfeaf | 5076 | start >> PAGE_SHIFT); |
452c75c3 CS |
5077 | if (eb && atomic_inc_not_zero(&eb->refs)) { |
5078 | rcu_read_unlock(); | |
062c19e9 FM |
5079 | /* |
5080 | * Lock our eb's refs_lock to avoid races with | |
5081 | * free_extent_buffer. When we get our eb it might be flagged | |
5082 | * with EXTENT_BUFFER_STALE and another task running | |
5083 | * free_extent_buffer might have seen that flag set, | |
5084 | * eb->refs == 2, that the buffer isn't under IO (dirty and | |
5085 | * writeback flags not set) and it's still in the tree (flag | |
5086 | * EXTENT_BUFFER_TREE_REF set), therefore being in the process | |
5087 | * of decrementing the extent buffer's reference count twice. | |
5088 | * So here we could race and increment the eb's reference count, | |
5089 | * clear its stale flag, mark it as dirty and drop our reference | |
5090 | * before the other task finishes executing free_extent_buffer, | |
5091 | * which would later result in an attempt to free an extent | |
5092 | * buffer that is dirty. | |
5093 | */ | |
5094 | if (test_bit(EXTENT_BUFFER_STALE, &eb->bflags)) { | |
5095 | spin_lock(&eb->refs_lock); | |
5096 | spin_unlock(&eb->refs_lock); | |
5097 | } | |
2457aec6 | 5098 | mark_extent_buffer_accessed(eb, NULL); |
452c75c3 CS |
5099 | return eb; |
5100 | } | |
5101 | rcu_read_unlock(); | |
5102 | ||
5103 | return NULL; | |
5104 | } | |
5105 | ||
faa2dbf0 JB |
5106 | #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS |
5107 | struct extent_buffer *alloc_test_extent_buffer(struct btrfs_fs_info *fs_info, | |
da17066c | 5108 | u64 start) |
faa2dbf0 JB |
5109 | { |
5110 | struct extent_buffer *eb, *exists = NULL; | |
5111 | int ret; | |
5112 | ||
5113 | eb = find_extent_buffer(fs_info, start); | |
5114 | if (eb) | |
5115 | return eb; | |
da17066c | 5116 | eb = alloc_dummy_extent_buffer(fs_info, start); |
faa2dbf0 | 5117 | if (!eb) |
b6293c82 | 5118 | return ERR_PTR(-ENOMEM); |
faa2dbf0 JB |
5119 | eb->fs_info = fs_info; |
5120 | again: | |
e1860a77 | 5121 | ret = radix_tree_preload(GFP_NOFS); |
b6293c82 DC |
5122 | if (ret) { |
5123 | exists = ERR_PTR(ret); | |
faa2dbf0 | 5124 | goto free_eb; |
b6293c82 | 5125 | } |
faa2dbf0 JB |
5126 | spin_lock(&fs_info->buffer_lock); |
5127 | ret = radix_tree_insert(&fs_info->buffer_radix, | |
09cbfeaf | 5128 | start >> PAGE_SHIFT, eb); |
faa2dbf0 JB |
5129 | spin_unlock(&fs_info->buffer_lock); |
5130 | radix_tree_preload_end(); | |
5131 | if (ret == -EEXIST) { | |
5132 | exists = find_extent_buffer(fs_info, start); | |
5133 | if (exists) | |
5134 | goto free_eb; | |
5135 | else | |
5136 | goto again; | |
5137 | } | |
5138 | check_buffer_tree_ref(eb); | |
5139 | set_bit(EXTENT_BUFFER_IN_TREE, &eb->bflags); | |
5140 | ||
faa2dbf0 JB |
5141 | return eb; |
5142 | free_eb: | |
5143 | btrfs_release_extent_buffer(eb); | |
5144 | return exists; | |
5145 | } | |
5146 | #endif | |
5147 | ||
f28491e0 | 5148 | struct extent_buffer *alloc_extent_buffer(struct btrfs_fs_info *fs_info, |
ce3e6984 | 5149 | u64 start) |
d1310b2e | 5150 | { |
da17066c | 5151 | unsigned long len = fs_info->nodesize; |
cc5e31a4 DS |
5152 | int num_pages; |
5153 | int i; | |
09cbfeaf | 5154 | unsigned long index = start >> PAGE_SHIFT; |
d1310b2e | 5155 | struct extent_buffer *eb; |
6af118ce | 5156 | struct extent_buffer *exists = NULL; |
d1310b2e | 5157 | struct page *p; |
f28491e0 | 5158 | struct address_space *mapping = fs_info->btree_inode->i_mapping; |
d1310b2e | 5159 | int uptodate = 1; |
19fe0a8b | 5160 | int ret; |
d1310b2e | 5161 | |
da17066c | 5162 | if (!IS_ALIGNED(start, fs_info->sectorsize)) { |
c871b0f2 LB |
5163 | btrfs_err(fs_info, "bad tree block start %llu", start); |
5164 | return ERR_PTR(-EINVAL); | |
5165 | } | |
5166 | ||
f28491e0 | 5167 | eb = find_extent_buffer(fs_info, start); |
452c75c3 | 5168 | if (eb) |
6af118ce | 5169 | return eb; |
6af118ce | 5170 | |
23d79d81 | 5171 | eb = __alloc_extent_buffer(fs_info, start, len); |
2b114d1d | 5172 | if (!eb) |
c871b0f2 | 5173 | return ERR_PTR(-ENOMEM); |
d1310b2e | 5174 | |
65ad0104 | 5175 | num_pages = num_extent_pages(eb); |
727011e0 | 5176 | for (i = 0; i < num_pages; i++, index++) { |
d1b5c567 | 5177 | p = find_or_create_page(mapping, index, GFP_NOFS|__GFP_NOFAIL); |
c871b0f2 LB |
5178 | if (!p) { |
5179 | exists = ERR_PTR(-ENOMEM); | |
6af118ce | 5180 | goto free_eb; |
c871b0f2 | 5181 | } |
4f2de97a JB |
5182 | |
5183 | spin_lock(&mapping->private_lock); | |
5184 | if (PagePrivate(p)) { | |
5185 | /* | |
5186 | * We could have already allocated an eb for this page | |
5187 | * and attached one so lets see if we can get a ref on | |
5188 | * the existing eb, and if we can we know it's good and | |
5189 | * we can just return that one, else we know we can just | |
5190 | * overwrite page->private. | |
5191 | */ | |
5192 | exists = (struct extent_buffer *)p->private; | |
5193 | if (atomic_inc_not_zero(&exists->refs)) { | |
5194 | spin_unlock(&mapping->private_lock); | |
5195 | unlock_page(p); | |
09cbfeaf | 5196 | put_page(p); |
2457aec6 | 5197 | mark_extent_buffer_accessed(exists, p); |
4f2de97a JB |
5198 | goto free_eb; |
5199 | } | |
5ca64f45 | 5200 | exists = NULL; |
4f2de97a | 5201 | |
0b32f4bb | 5202 | /* |
4f2de97a JB |
5203 | * Do this so attach doesn't complain and we need to |
5204 | * drop the ref the old guy had. | |
5205 | */ | |
5206 | ClearPagePrivate(p); | |
0b32f4bb | 5207 | WARN_ON(PageDirty(p)); |
09cbfeaf | 5208 | put_page(p); |
d1310b2e | 5209 | } |
4f2de97a JB |
5210 | attach_extent_buffer_page(eb, p); |
5211 | spin_unlock(&mapping->private_lock); | |
0b32f4bb | 5212 | WARN_ON(PageDirty(p)); |
727011e0 | 5213 | eb->pages[i] = p; |
d1310b2e CM |
5214 | if (!PageUptodate(p)) |
5215 | uptodate = 0; | |
eb14ab8e CM |
5216 | |
5217 | /* | |
b16d011e NB |
5218 | * We can't unlock the pages just yet since the extent buffer |
5219 | * hasn't been properly inserted in the radix tree, this | |
5220 | * opens a race with btree_releasepage which can free a page | |
5221 | * while we are still filling in all pages for the buffer and | |
5222 | * we could crash. | |
eb14ab8e | 5223 | */ |
d1310b2e CM |
5224 | } |
5225 | if (uptodate) | |
b4ce94de | 5226 | set_bit(EXTENT_BUFFER_UPTODATE, &eb->bflags); |
115391d2 | 5227 | again: |
e1860a77 | 5228 | ret = radix_tree_preload(GFP_NOFS); |
c871b0f2 LB |
5229 | if (ret) { |
5230 | exists = ERR_PTR(ret); | |
19fe0a8b | 5231 | goto free_eb; |
c871b0f2 | 5232 | } |
19fe0a8b | 5233 | |
f28491e0 JB |
5234 | spin_lock(&fs_info->buffer_lock); |
5235 | ret = radix_tree_insert(&fs_info->buffer_radix, | |
09cbfeaf | 5236 | start >> PAGE_SHIFT, eb); |
f28491e0 | 5237 | spin_unlock(&fs_info->buffer_lock); |
452c75c3 | 5238 | radix_tree_preload_end(); |
19fe0a8b | 5239 | if (ret == -EEXIST) { |
f28491e0 | 5240 | exists = find_extent_buffer(fs_info, start); |
452c75c3 CS |
5241 | if (exists) |
5242 | goto free_eb; | |
5243 | else | |
115391d2 | 5244 | goto again; |
6af118ce | 5245 | } |
6af118ce | 5246 | /* add one reference for the tree */ |
0b32f4bb | 5247 | check_buffer_tree_ref(eb); |
34b41ace | 5248 | set_bit(EXTENT_BUFFER_IN_TREE, &eb->bflags); |
eb14ab8e CM |
5249 | |
5250 | /* | |
b16d011e NB |
5251 | * Now it's safe to unlock the pages because any calls to |
5252 | * btree_releasepage will correctly detect that a page belongs to a | |
5253 | * live buffer and won't free them prematurely. | |
eb14ab8e | 5254 | */ |
28187ae5 NB |
5255 | for (i = 0; i < num_pages; i++) |
5256 | unlock_page(eb->pages[i]); | |
d1310b2e CM |
5257 | return eb; |
5258 | ||
6af118ce | 5259 | free_eb: |
5ca64f45 | 5260 | WARN_ON(!atomic_dec_and_test(&eb->refs)); |
727011e0 CM |
5261 | for (i = 0; i < num_pages; i++) { |
5262 | if (eb->pages[i]) | |
5263 | unlock_page(eb->pages[i]); | |
5264 | } | |
eb14ab8e | 5265 | |
897ca6e9 | 5266 | btrfs_release_extent_buffer(eb); |
6af118ce | 5267 | return exists; |
d1310b2e | 5268 | } |
d1310b2e | 5269 | |
3083ee2e JB |
5270 | static inline void btrfs_release_extent_buffer_rcu(struct rcu_head *head) |
5271 | { | |
5272 | struct extent_buffer *eb = | |
5273 | container_of(head, struct extent_buffer, rcu_head); | |
5274 | ||
5275 | __free_extent_buffer(eb); | |
5276 | } | |
5277 | ||
f7a52a40 | 5278 | static int release_extent_buffer(struct extent_buffer *eb) |
3083ee2e | 5279 | { |
07e21c4d NB |
5280 | lockdep_assert_held(&eb->refs_lock); |
5281 | ||
3083ee2e JB |
5282 | WARN_ON(atomic_read(&eb->refs) == 0); |
5283 | if (atomic_dec_and_test(&eb->refs)) { | |
34b41ace | 5284 | if (test_and_clear_bit(EXTENT_BUFFER_IN_TREE, &eb->bflags)) { |
f28491e0 | 5285 | struct btrfs_fs_info *fs_info = eb->fs_info; |
3083ee2e | 5286 | |
815a51c7 | 5287 | spin_unlock(&eb->refs_lock); |
3083ee2e | 5288 | |
f28491e0 JB |
5289 | spin_lock(&fs_info->buffer_lock); |
5290 | radix_tree_delete(&fs_info->buffer_radix, | |
09cbfeaf | 5291 | eb->start >> PAGE_SHIFT); |
f28491e0 | 5292 | spin_unlock(&fs_info->buffer_lock); |
34b41ace JB |
5293 | } else { |
5294 | spin_unlock(&eb->refs_lock); | |
815a51c7 | 5295 | } |
3083ee2e JB |
5296 | |
5297 | /* Should be safe to release our pages at this point */ | |
55ac0139 | 5298 | btrfs_release_extent_buffer_pages(eb); |
bcb7e449 | 5299 | #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS |
b0132a3b | 5300 | if (unlikely(test_bit(EXTENT_BUFFER_UNMAPPED, &eb->bflags))) { |
bcb7e449 JB |
5301 | __free_extent_buffer(eb); |
5302 | return 1; | |
5303 | } | |
5304 | #endif | |
3083ee2e | 5305 | call_rcu(&eb->rcu_head, btrfs_release_extent_buffer_rcu); |
e64860aa | 5306 | return 1; |
3083ee2e JB |
5307 | } |
5308 | spin_unlock(&eb->refs_lock); | |
e64860aa JB |
5309 | |
5310 | return 0; | |
3083ee2e JB |
5311 | } |
5312 | ||
d1310b2e CM |
5313 | void free_extent_buffer(struct extent_buffer *eb) |
5314 | { | |
242e18c7 CM |
5315 | int refs; |
5316 | int old; | |
d1310b2e CM |
5317 | if (!eb) |
5318 | return; | |
5319 | ||
242e18c7 CM |
5320 | while (1) { |
5321 | refs = atomic_read(&eb->refs); | |
46cc775e NB |
5322 | if ((!test_bit(EXTENT_BUFFER_UNMAPPED, &eb->bflags) && refs <= 3) |
5323 | || (test_bit(EXTENT_BUFFER_UNMAPPED, &eb->bflags) && | |
5324 | refs == 1)) | |
242e18c7 CM |
5325 | break; |
5326 | old = atomic_cmpxchg(&eb->refs, refs, refs - 1); | |
5327 | if (old == refs) | |
5328 | return; | |
5329 | } | |
5330 | ||
3083ee2e JB |
5331 | spin_lock(&eb->refs_lock); |
5332 | if (atomic_read(&eb->refs) == 2 && | |
5333 | test_bit(EXTENT_BUFFER_STALE, &eb->bflags) && | |
0b32f4bb | 5334 | !extent_buffer_under_io(eb) && |
3083ee2e JB |
5335 | test_and_clear_bit(EXTENT_BUFFER_TREE_REF, &eb->bflags)) |
5336 | atomic_dec(&eb->refs); | |
5337 | ||
5338 | /* | |
5339 | * I know this is terrible, but it's temporary until we stop tracking | |
5340 | * the uptodate bits and such for the extent buffers. | |
5341 | */ | |
f7a52a40 | 5342 | release_extent_buffer(eb); |
3083ee2e JB |
5343 | } |
5344 | ||
5345 | void free_extent_buffer_stale(struct extent_buffer *eb) | |
5346 | { | |
5347 | if (!eb) | |
d1310b2e CM |
5348 | return; |
5349 | ||
3083ee2e JB |
5350 | spin_lock(&eb->refs_lock); |
5351 | set_bit(EXTENT_BUFFER_STALE, &eb->bflags); | |
5352 | ||
0b32f4bb | 5353 | if (atomic_read(&eb->refs) == 2 && !extent_buffer_under_io(eb) && |
3083ee2e JB |
5354 | test_and_clear_bit(EXTENT_BUFFER_TREE_REF, &eb->bflags)) |
5355 | atomic_dec(&eb->refs); | |
f7a52a40 | 5356 | release_extent_buffer(eb); |
d1310b2e | 5357 | } |
d1310b2e | 5358 | |
1d4284bd | 5359 | void clear_extent_buffer_dirty(struct extent_buffer *eb) |
d1310b2e | 5360 | { |
cc5e31a4 DS |
5361 | int i; |
5362 | int num_pages; | |
d1310b2e CM |
5363 | struct page *page; |
5364 | ||
65ad0104 | 5365 | num_pages = num_extent_pages(eb); |
d1310b2e CM |
5366 | |
5367 | for (i = 0; i < num_pages; i++) { | |
fb85fc9a | 5368 | page = eb->pages[i]; |
b9473439 | 5369 | if (!PageDirty(page)) |
d2c3f4f6 CM |
5370 | continue; |
5371 | ||
a61e6f29 | 5372 | lock_page(page); |
eb14ab8e CM |
5373 | WARN_ON(!PagePrivate(page)); |
5374 | ||
d1310b2e | 5375 | clear_page_dirty_for_io(page); |
b93b0163 | 5376 | xa_lock_irq(&page->mapping->i_pages); |
0a943c65 MW |
5377 | if (!PageDirty(page)) |
5378 | __xa_clear_mark(&page->mapping->i_pages, | |
5379 | page_index(page), PAGECACHE_TAG_DIRTY); | |
b93b0163 | 5380 | xa_unlock_irq(&page->mapping->i_pages); |
bf0da8c1 | 5381 | ClearPageError(page); |
a61e6f29 | 5382 | unlock_page(page); |
d1310b2e | 5383 | } |
0b32f4bb | 5384 | WARN_ON(atomic_read(&eb->refs) == 0); |
d1310b2e | 5385 | } |
d1310b2e | 5386 | |
abb57ef3 | 5387 | bool set_extent_buffer_dirty(struct extent_buffer *eb) |
d1310b2e | 5388 | { |
cc5e31a4 DS |
5389 | int i; |
5390 | int num_pages; | |
abb57ef3 | 5391 | bool was_dirty; |
d1310b2e | 5392 | |
0b32f4bb JB |
5393 | check_buffer_tree_ref(eb); |
5394 | ||
b9473439 | 5395 | was_dirty = test_and_set_bit(EXTENT_BUFFER_DIRTY, &eb->bflags); |
0b32f4bb | 5396 | |
65ad0104 | 5397 | num_pages = num_extent_pages(eb); |
3083ee2e | 5398 | WARN_ON(atomic_read(&eb->refs) == 0); |
0b32f4bb JB |
5399 | WARN_ON(!test_bit(EXTENT_BUFFER_TREE_REF, &eb->bflags)); |
5400 | ||
abb57ef3 LB |
5401 | if (!was_dirty) |
5402 | for (i = 0; i < num_pages; i++) | |
5403 | set_page_dirty(eb->pages[i]); | |
51995c39 LB |
5404 | |
5405 | #ifdef CONFIG_BTRFS_DEBUG | |
5406 | for (i = 0; i < num_pages; i++) | |
5407 | ASSERT(PageDirty(eb->pages[i])); | |
5408 | #endif | |
5409 | ||
b9473439 | 5410 | return was_dirty; |
d1310b2e | 5411 | } |
d1310b2e | 5412 | |
69ba3927 | 5413 | void clear_extent_buffer_uptodate(struct extent_buffer *eb) |
1259ab75 | 5414 | { |
cc5e31a4 | 5415 | int i; |
1259ab75 | 5416 | struct page *page; |
cc5e31a4 | 5417 | int num_pages; |
1259ab75 | 5418 | |
b4ce94de | 5419 | clear_bit(EXTENT_BUFFER_UPTODATE, &eb->bflags); |
65ad0104 | 5420 | num_pages = num_extent_pages(eb); |
1259ab75 | 5421 | for (i = 0; i < num_pages; i++) { |
fb85fc9a | 5422 | page = eb->pages[i]; |
33958dc6 CM |
5423 | if (page) |
5424 | ClearPageUptodate(page); | |
1259ab75 | 5425 | } |
1259ab75 CM |
5426 | } |
5427 | ||
09c25a8c | 5428 | void set_extent_buffer_uptodate(struct extent_buffer *eb) |
d1310b2e | 5429 | { |
cc5e31a4 | 5430 | int i; |
d1310b2e | 5431 | struct page *page; |
cc5e31a4 | 5432 | int num_pages; |
d1310b2e | 5433 | |
0b32f4bb | 5434 | set_bit(EXTENT_BUFFER_UPTODATE, &eb->bflags); |
65ad0104 | 5435 | num_pages = num_extent_pages(eb); |
d1310b2e | 5436 | for (i = 0; i < num_pages; i++) { |
fb85fc9a | 5437 | page = eb->pages[i]; |
d1310b2e CM |
5438 | SetPageUptodate(page); |
5439 | } | |
d1310b2e | 5440 | } |
d1310b2e | 5441 | |
c2ccfbc6 | 5442 | int read_extent_buffer_pages(struct extent_buffer *eb, int wait, int mirror_num) |
d1310b2e | 5443 | { |
cc5e31a4 | 5444 | int i; |
d1310b2e CM |
5445 | struct page *page; |
5446 | int err; | |
5447 | int ret = 0; | |
ce9adaa5 CM |
5448 | int locked_pages = 0; |
5449 | int all_uptodate = 1; | |
cc5e31a4 | 5450 | int num_pages; |
727011e0 | 5451 | unsigned long num_reads = 0; |
a86c12c7 | 5452 | struct bio *bio = NULL; |
c8b97818 | 5453 | unsigned long bio_flags = 0; |
c2ccfbc6 | 5454 | struct extent_io_tree *tree = &BTRFS_I(eb->fs_info->btree_inode)->io_tree; |
a86c12c7 | 5455 | |
b4ce94de | 5456 | if (test_bit(EXTENT_BUFFER_UPTODATE, &eb->bflags)) |
d1310b2e CM |
5457 | return 0; |
5458 | ||
ae6957eb DS |
5459 | ASSERT(tree == &BTRFS_I(eb->pages[0]->mapping->host)->io_tree); |
5460 | ||
65ad0104 | 5461 | num_pages = num_extent_pages(eb); |
8436ea91 | 5462 | for (i = 0; i < num_pages; i++) { |
fb85fc9a | 5463 | page = eb->pages[i]; |
bb82ab88 | 5464 | if (wait == WAIT_NONE) { |
2db04966 | 5465 | if (!trylock_page(page)) |
ce9adaa5 | 5466 | goto unlock_exit; |
d1310b2e CM |
5467 | } else { |
5468 | lock_page(page); | |
5469 | } | |
ce9adaa5 | 5470 | locked_pages++; |
2571e739 LB |
5471 | } |
5472 | /* | |
5473 | * We need to firstly lock all pages to make sure that | |
5474 | * the uptodate bit of our pages won't be affected by | |
5475 | * clear_extent_buffer_uptodate(). | |
5476 | */ | |
8436ea91 | 5477 | for (i = 0; i < num_pages; i++) { |
2571e739 | 5478 | page = eb->pages[i]; |
727011e0 CM |
5479 | if (!PageUptodate(page)) { |
5480 | num_reads++; | |
ce9adaa5 | 5481 | all_uptodate = 0; |
727011e0 | 5482 | } |
ce9adaa5 | 5483 | } |
2571e739 | 5484 | |
ce9adaa5 | 5485 | if (all_uptodate) { |
8436ea91 | 5486 | set_bit(EXTENT_BUFFER_UPTODATE, &eb->bflags); |
ce9adaa5 CM |
5487 | goto unlock_exit; |
5488 | } | |
5489 | ||
656f30db | 5490 | clear_bit(EXTENT_BUFFER_READ_ERR, &eb->bflags); |
5cf1ab56 | 5491 | eb->read_mirror = 0; |
0b32f4bb | 5492 | atomic_set(&eb->io_pages, num_reads); |
8436ea91 | 5493 | for (i = 0; i < num_pages; i++) { |
fb85fc9a | 5494 | page = eb->pages[i]; |
baf863b9 | 5495 | |
ce9adaa5 | 5496 | if (!PageUptodate(page)) { |
baf863b9 LB |
5497 | if (ret) { |
5498 | atomic_dec(&eb->io_pages); | |
5499 | unlock_page(page); | |
5500 | continue; | |
5501 | } | |
5502 | ||
f188591e | 5503 | ClearPageError(page); |
a86c12c7 | 5504 | err = __extent_read_full_page(tree, page, |
6af49dbd | 5505 | btree_get_extent, &bio, |
d4c7ca86 | 5506 | mirror_num, &bio_flags, |
1f7ad75b | 5507 | REQ_META); |
baf863b9 | 5508 | if (err) { |
d1310b2e | 5509 | ret = err; |
baf863b9 LB |
5510 | /* |
5511 | * We use &bio in above __extent_read_full_page, | |
5512 | * so we ensure that if it returns error, the | |
5513 | * current page fails to add itself to bio and | |
5514 | * it's been unlocked. | |
5515 | * | |
5516 | * We must dec io_pages by ourselves. | |
5517 | */ | |
5518 | atomic_dec(&eb->io_pages); | |
5519 | } | |
d1310b2e CM |
5520 | } else { |
5521 | unlock_page(page); | |
5522 | } | |
5523 | } | |
5524 | ||
355808c2 | 5525 | if (bio) { |
1f7ad75b | 5526 | err = submit_one_bio(bio, mirror_num, bio_flags); |
79787eaa JM |
5527 | if (err) |
5528 | return err; | |
355808c2 | 5529 | } |
a86c12c7 | 5530 | |
bb82ab88 | 5531 | if (ret || wait != WAIT_COMPLETE) |
d1310b2e | 5532 | return ret; |
d397712b | 5533 | |
8436ea91 | 5534 | for (i = 0; i < num_pages; i++) { |
fb85fc9a | 5535 | page = eb->pages[i]; |
d1310b2e | 5536 | wait_on_page_locked(page); |
d397712b | 5537 | if (!PageUptodate(page)) |
d1310b2e | 5538 | ret = -EIO; |
d1310b2e | 5539 | } |
d397712b | 5540 | |
d1310b2e | 5541 | return ret; |
ce9adaa5 CM |
5542 | |
5543 | unlock_exit: | |
d397712b | 5544 | while (locked_pages > 0) { |
ce9adaa5 | 5545 | locked_pages--; |
8436ea91 JB |
5546 | page = eb->pages[locked_pages]; |
5547 | unlock_page(page); | |
ce9adaa5 CM |
5548 | } |
5549 | return ret; | |
d1310b2e | 5550 | } |
d1310b2e | 5551 | |
1cbb1f45 JM |
5552 | void read_extent_buffer(const struct extent_buffer *eb, void *dstv, |
5553 | unsigned long start, unsigned long len) | |
d1310b2e CM |
5554 | { |
5555 | size_t cur; | |
5556 | size_t offset; | |
5557 | struct page *page; | |
5558 | char *kaddr; | |
5559 | char *dst = (char *)dstv; | |
7073017a | 5560 | size_t start_offset = offset_in_page(eb->start); |
09cbfeaf | 5561 | unsigned long i = (start_offset + start) >> PAGE_SHIFT; |
d1310b2e | 5562 | |
f716abd5 LB |
5563 | if (start + len > eb->len) { |
5564 | WARN(1, KERN_ERR "btrfs bad mapping eb start %llu len %lu, wanted %lu %lu\n", | |
5565 | eb->start, eb->len, start, len); | |
5566 | memset(dst, 0, len); | |
5567 | return; | |
5568 | } | |
d1310b2e | 5569 | |
7073017a | 5570 | offset = offset_in_page(start_offset + start); |
d1310b2e | 5571 | |
d397712b | 5572 | while (len > 0) { |
fb85fc9a | 5573 | page = eb->pages[i]; |
d1310b2e | 5574 | |
09cbfeaf | 5575 | cur = min(len, (PAGE_SIZE - offset)); |
a6591715 | 5576 | kaddr = page_address(page); |
d1310b2e | 5577 | memcpy(dst, kaddr + offset, cur); |
d1310b2e CM |
5578 | |
5579 | dst += cur; | |
5580 | len -= cur; | |
5581 | offset = 0; | |
5582 | i++; | |
5583 | } | |
5584 | } | |
d1310b2e | 5585 | |
1cbb1f45 JM |
5586 | int read_extent_buffer_to_user(const struct extent_buffer *eb, |
5587 | void __user *dstv, | |
5588 | unsigned long start, unsigned long len) | |
550ac1d8 GH |
5589 | { |
5590 | size_t cur; | |
5591 | size_t offset; | |
5592 | struct page *page; | |
5593 | char *kaddr; | |
5594 | char __user *dst = (char __user *)dstv; | |
7073017a | 5595 | size_t start_offset = offset_in_page(eb->start); |
09cbfeaf | 5596 | unsigned long i = (start_offset + start) >> PAGE_SHIFT; |
550ac1d8 GH |
5597 | int ret = 0; |
5598 | ||
5599 | WARN_ON(start > eb->len); | |
5600 | WARN_ON(start + len > eb->start + eb->len); | |
5601 | ||
7073017a | 5602 | offset = offset_in_page(start_offset + start); |
550ac1d8 GH |
5603 | |
5604 | while (len > 0) { | |
fb85fc9a | 5605 | page = eb->pages[i]; |
550ac1d8 | 5606 | |
09cbfeaf | 5607 | cur = min(len, (PAGE_SIZE - offset)); |
550ac1d8 GH |
5608 | kaddr = page_address(page); |
5609 | if (copy_to_user(dst, kaddr + offset, cur)) { | |
5610 | ret = -EFAULT; | |
5611 | break; | |
5612 | } | |
5613 | ||
5614 | dst += cur; | |
5615 | len -= cur; | |
5616 | offset = 0; | |
5617 | i++; | |
5618 | } | |
5619 | ||
5620 | return ret; | |
5621 | } | |
5622 | ||
415b35a5 LB |
5623 | /* |
5624 | * return 0 if the item is found within a page. | |
5625 | * return 1 if the item spans two pages. | |
5626 | * return -EINVAL otherwise. | |
5627 | */ | |
1cbb1f45 JM |
5628 | int map_private_extent_buffer(const struct extent_buffer *eb, |
5629 | unsigned long start, unsigned long min_len, | |
5630 | char **map, unsigned long *map_start, | |
5631 | unsigned long *map_len) | |
d1310b2e | 5632 | { |
cc2c39d6 | 5633 | size_t offset; |
d1310b2e CM |
5634 | char *kaddr; |
5635 | struct page *p; | |
7073017a | 5636 | size_t start_offset = offset_in_page(eb->start); |
09cbfeaf | 5637 | unsigned long i = (start_offset + start) >> PAGE_SHIFT; |
d1310b2e | 5638 | unsigned long end_i = (start_offset + start + min_len - 1) >> |
09cbfeaf | 5639 | PAGE_SHIFT; |
d1310b2e | 5640 | |
f716abd5 LB |
5641 | if (start + min_len > eb->len) { |
5642 | WARN(1, KERN_ERR "btrfs bad mapping eb start %llu len %lu, wanted %lu %lu\n", | |
5643 | eb->start, eb->len, start, min_len); | |
5644 | return -EINVAL; | |
5645 | } | |
5646 | ||
d1310b2e | 5647 | if (i != end_i) |
415b35a5 | 5648 | return 1; |
d1310b2e CM |
5649 | |
5650 | if (i == 0) { | |
5651 | offset = start_offset; | |
5652 | *map_start = 0; | |
5653 | } else { | |
5654 | offset = 0; | |
09cbfeaf | 5655 | *map_start = ((u64)i << PAGE_SHIFT) - start_offset; |
d1310b2e | 5656 | } |
d397712b | 5657 | |
fb85fc9a | 5658 | p = eb->pages[i]; |
a6591715 | 5659 | kaddr = page_address(p); |
d1310b2e | 5660 | *map = kaddr + offset; |
09cbfeaf | 5661 | *map_len = PAGE_SIZE - offset; |
d1310b2e CM |
5662 | return 0; |
5663 | } | |
d1310b2e | 5664 | |
1cbb1f45 JM |
5665 | int memcmp_extent_buffer(const struct extent_buffer *eb, const void *ptrv, |
5666 | unsigned long start, unsigned long len) | |
d1310b2e CM |
5667 | { |
5668 | size_t cur; | |
5669 | size_t offset; | |
5670 | struct page *page; | |
5671 | char *kaddr; | |
5672 | char *ptr = (char *)ptrv; | |
7073017a | 5673 | size_t start_offset = offset_in_page(eb->start); |
09cbfeaf | 5674 | unsigned long i = (start_offset + start) >> PAGE_SHIFT; |
d1310b2e CM |
5675 | int ret = 0; |
5676 | ||
5677 | WARN_ON(start > eb->len); | |
5678 | WARN_ON(start + len > eb->start + eb->len); | |
5679 | ||
7073017a | 5680 | offset = offset_in_page(start_offset + start); |
d1310b2e | 5681 | |
d397712b | 5682 | while (len > 0) { |
fb85fc9a | 5683 | page = eb->pages[i]; |
d1310b2e | 5684 | |
09cbfeaf | 5685 | cur = min(len, (PAGE_SIZE - offset)); |
d1310b2e | 5686 | |
a6591715 | 5687 | kaddr = page_address(page); |
d1310b2e | 5688 | ret = memcmp(ptr, kaddr + offset, cur); |
d1310b2e CM |
5689 | if (ret) |
5690 | break; | |
5691 | ||
5692 | ptr += cur; | |
5693 | len -= cur; | |
5694 | offset = 0; | |
5695 | i++; | |
5696 | } | |
5697 | return ret; | |
5698 | } | |
d1310b2e | 5699 | |
f157bf76 DS |
5700 | void write_extent_buffer_chunk_tree_uuid(struct extent_buffer *eb, |
5701 | const void *srcv) | |
5702 | { | |
5703 | char *kaddr; | |
5704 | ||
5705 | WARN_ON(!PageUptodate(eb->pages[0])); | |
5706 | kaddr = page_address(eb->pages[0]); | |
5707 | memcpy(kaddr + offsetof(struct btrfs_header, chunk_tree_uuid), srcv, | |
5708 | BTRFS_FSID_SIZE); | |
5709 | } | |
5710 | ||
5711 | void write_extent_buffer_fsid(struct extent_buffer *eb, const void *srcv) | |
5712 | { | |
5713 | char *kaddr; | |
5714 | ||
5715 | WARN_ON(!PageUptodate(eb->pages[0])); | |
5716 | kaddr = page_address(eb->pages[0]); | |
5717 | memcpy(kaddr + offsetof(struct btrfs_header, fsid), srcv, | |
5718 | BTRFS_FSID_SIZE); | |
5719 | } | |
5720 | ||
d1310b2e CM |
5721 | void write_extent_buffer(struct extent_buffer *eb, const void *srcv, |
5722 | unsigned long start, unsigned long len) | |
5723 | { | |
5724 | size_t cur; | |
5725 | size_t offset; | |
5726 | struct page *page; | |
5727 | char *kaddr; | |
5728 | char *src = (char *)srcv; | |
7073017a | 5729 | size_t start_offset = offset_in_page(eb->start); |
09cbfeaf | 5730 | unsigned long i = (start_offset + start) >> PAGE_SHIFT; |
d1310b2e CM |
5731 | |
5732 | WARN_ON(start > eb->len); | |
5733 | WARN_ON(start + len > eb->start + eb->len); | |
5734 | ||
7073017a | 5735 | offset = offset_in_page(start_offset + start); |
d1310b2e | 5736 | |
d397712b | 5737 | while (len > 0) { |
fb85fc9a | 5738 | page = eb->pages[i]; |
d1310b2e CM |
5739 | WARN_ON(!PageUptodate(page)); |
5740 | ||
09cbfeaf | 5741 | cur = min(len, PAGE_SIZE - offset); |
a6591715 | 5742 | kaddr = page_address(page); |
d1310b2e | 5743 | memcpy(kaddr + offset, src, cur); |
d1310b2e CM |
5744 | |
5745 | src += cur; | |
5746 | len -= cur; | |
5747 | offset = 0; | |
5748 | i++; | |
5749 | } | |
5750 | } | |
d1310b2e | 5751 | |
b159fa28 DS |
5752 | void memzero_extent_buffer(struct extent_buffer *eb, unsigned long start, |
5753 | unsigned long len) | |
d1310b2e CM |
5754 | { |
5755 | size_t cur; | |
5756 | size_t offset; | |
5757 | struct page *page; | |
5758 | char *kaddr; | |
7073017a | 5759 | size_t start_offset = offset_in_page(eb->start); |
09cbfeaf | 5760 | unsigned long i = (start_offset + start) >> PAGE_SHIFT; |
d1310b2e CM |
5761 | |
5762 | WARN_ON(start > eb->len); | |
5763 | WARN_ON(start + len > eb->start + eb->len); | |
5764 | ||
7073017a | 5765 | offset = offset_in_page(start_offset + start); |
d1310b2e | 5766 | |
d397712b | 5767 | while (len > 0) { |
fb85fc9a | 5768 | page = eb->pages[i]; |
d1310b2e CM |
5769 | WARN_ON(!PageUptodate(page)); |
5770 | ||
09cbfeaf | 5771 | cur = min(len, PAGE_SIZE - offset); |
a6591715 | 5772 | kaddr = page_address(page); |
b159fa28 | 5773 | memset(kaddr + offset, 0, cur); |
d1310b2e CM |
5774 | |
5775 | len -= cur; | |
5776 | offset = 0; | |
5777 | i++; | |
5778 | } | |
5779 | } | |
d1310b2e | 5780 | |
58e8012c DS |
5781 | void copy_extent_buffer_full(struct extent_buffer *dst, |
5782 | struct extent_buffer *src) | |
5783 | { | |
5784 | int i; | |
cc5e31a4 | 5785 | int num_pages; |
58e8012c DS |
5786 | |
5787 | ASSERT(dst->len == src->len); | |
5788 | ||
65ad0104 | 5789 | num_pages = num_extent_pages(dst); |
58e8012c DS |
5790 | for (i = 0; i < num_pages; i++) |
5791 | copy_page(page_address(dst->pages[i]), | |
5792 | page_address(src->pages[i])); | |
5793 | } | |
5794 | ||
d1310b2e CM |
5795 | void copy_extent_buffer(struct extent_buffer *dst, struct extent_buffer *src, |
5796 | unsigned long dst_offset, unsigned long src_offset, | |
5797 | unsigned long len) | |
5798 | { | |
5799 | u64 dst_len = dst->len; | |
5800 | size_t cur; | |
5801 | size_t offset; | |
5802 | struct page *page; | |
5803 | char *kaddr; | |
7073017a | 5804 | size_t start_offset = offset_in_page(dst->start); |
09cbfeaf | 5805 | unsigned long i = (start_offset + dst_offset) >> PAGE_SHIFT; |
d1310b2e CM |
5806 | |
5807 | WARN_ON(src->len != dst_len); | |
5808 | ||
7073017a | 5809 | offset = offset_in_page(start_offset + dst_offset); |
d1310b2e | 5810 | |
d397712b | 5811 | while (len > 0) { |
fb85fc9a | 5812 | page = dst->pages[i]; |
d1310b2e CM |
5813 | WARN_ON(!PageUptodate(page)); |
5814 | ||
09cbfeaf | 5815 | cur = min(len, (unsigned long)(PAGE_SIZE - offset)); |
d1310b2e | 5816 | |
a6591715 | 5817 | kaddr = page_address(page); |
d1310b2e | 5818 | read_extent_buffer(src, kaddr + offset, src_offset, cur); |
d1310b2e CM |
5819 | |
5820 | src_offset += cur; | |
5821 | len -= cur; | |
5822 | offset = 0; | |
5823 | i++; | |
5824 | } | |
5825 | } | |
d1310b2e | 5826 | |
3e1e8bb7 OS |
5827 | /* |
5828 | * eb_bitmap_offset() - calculate the page and offset of the byte containing the | |
5829 | * given bit number | |
5830 | * @eb: the extent buffer | |
5831 | * @start: offset of the bitmap item in the extent buffer | |
5832 | * @nr: bit number | |
5833 | * @page_index: return index of the page in the extent buffer that contains the | |
5834 | * given bit number | |
5835 | * @page_offset: return offset into the page given by page_index | |
5836 | * | |
5837 | * This helper hides the ugliness of finding the byte in an extent buffer which | |
5838 | * contains a given bit. | |
5839 | */ | |
5840 | static inline void eb_bitmap_offset(struct extent_buffer *eb, | |
5841 | unsigned long start, unsigned long nr, | |
5842 | unsigned long *page_index, | |
5843 | size_t *page_offset) | |
5844 | { | |
7073017a | 5845 | size_t start_offset = offset_in_page(eb->start); |
3e1e8bb7 OS |
5846 | size_t byte_offset = BIT_BYTE(nr); |
5847 | size_t offset; | |
5848 | ||
5849 | /* | |
5850 | * The byte we want is the offset of the extent buffer + the offset of | |
5851 | * the bitmap item in the extent buffer + the offset of the byte in the | |
5852 | * bitmap item. | |
5853 | */ | |
5854 | offset = start_offset + start + byte_offset; | |
5855 | ||
09cbfeaf | 5856 | *page_index = offset >> PAGE_SHIFT; |
7073017a | 5857 | *page_offset = offset_in_page(offset); |
3e1e8bb7 OS |
5858 | } |
5859 | ||
5860 | /** | |
5861 | * extent_buffer_test_bit - determine whether a bit in a bitmap item is set | |
5862 | * @eb: the extent buffer | |
5863 | * @start: offset of the bitmap item in the extent buffer | |
5864 | * @nr: bit number to test | |
5865 | */ | |
5866 | int extent_buffer_test_bit(struct extent_buffer *eb, unsigned long start, | |
5867 | unsigned long nr) | |
5868 | { | |
2fe1d551 | 5869 | u8 *kaddr; |
3e1e8bb7 OS |
5870 | struct page *page; |
5871 | unsigned long i; | |
5872 | size_t offset; | |
5873 | ||
5874 | eb_bitmap_offset(eb, start, nr, &i, &offset); | |
5875 | page = eb->pages[i]; | |
5876 | WARN_ON(!PageUptodate(page)); | |
5877 | kaddr = page_address(page); | |
5878 | return 1U & (kaddr[offset] >> (nr & (BITS_PER_BYTE - 1))); | |
5879 | } | |
5880 | ||
5881 | /** | |
5882 | * extent_buffer_bitmap_set - set an area of a bitmap | |
5883 | * @eb: the extent buffer | |
5884 | * @start: offset of the bitmap item in the extent buffer | |
5885 | * @pos: bit number of the first bit | |
5886 | * @len: number of bits to set | |
5887 | */ | |
5888 | void extent_buffer_bitmap_set(struct extent_buffer *eb, unsigned long start, | |
5889 | unsigned long pos, unsigned long len) | |
5890 | { | |
2fe1d551 | 5891 | u8 *kaddr; |
3e1e8bb7 OS |
5892 | struct page *page; |
5893 | unsigned long i; | |
5894 | size_t offset; | |
5895 | const unsigned int size = pos + len; | |
5896 | int bits_to_set = BITS_PER_BYTE - (pos % BITS_PER_BYTE); | |
2fe1d551 | 5897 | u8 mask_to_set = BITMAP_FIRST_BYTE_MASK(pos); |
3e1e8bb7 OS |
5898 | |
5899 | eb_bitmap_offset(eb, start, pos, &i, &offset); | |
5900 | page = eb->pages[i]; | |
5901 | WARN_ON(!PageUptodate(page)); | |
5902 | kaddr = page_address(page); | |
5903 | ||
5904 | while (len >= bits_to_set) { | |
5905 | kaddr[offset] |= mask_to_set; | |
5906 | len -= bits_to_set; | |
5907 | bits_to_set = BITS_PER_BYTE; | |
9c894696 | 5908 | mask_to_set = ~0; |
09cbfeaf | 5909 | if (++offset >= PAGE_SIZE && len > 0) { |
3e1e8bb7 OS |
5910 | offset = 0; |
5911 | page = eb->pages[++i]; | |
5912 | WARN_ON(!PageUptodate(page)); | |
5913 | kaddr = page_address(page); | |
5914 | } | |
5915 | } | |
5916 | if (len) { | |
5917 | mask_to_set &= BITMAP_LAST_BYTE_MASK(size); | |
5918 | kaddr[offset] |= mask_to_set; | |
5919 | } | |
5920 | } | |
5921 | ||
5922 | ||
5923 | /** | |
5924 | * extent_buffer_bitmap_clear - clear an area of a bitmap | |
5925 | * @eb: the extent buffer | |
5926 | * @start: offset of the bitmap item in the extent buffer | |
5927 | * @pos: bit number of the first bit | |
5928 | * @len: number of bits to clear | |
5929 | */ | |
5930 | void extent_buffer_bitmap_clear(struct extent_buffer *eb, unsigned long start, | |
5931 | unsigned long pos, unsigned long len) | |
5932 | { | |
2fe1d551 | 5933 | u8 *kaddr; |
3e1e8bb7 OS |
5934 | struct page *page; |
5935 | unsigned long i; | |
5936 | size_t offset; | |
5937 | const unsigned int size = pos + len; | |
5938 | int bits_to_clear = BITS_PER_BYTE - (pos % BITS_PER_BYTE); | |
2fe1d551 | 5939 | u8 mask_to_clear = BITMAP_FIRST_BYTE_MASK(pos); |
3e1e8bb7 OS |
5940 | |
5941 | eb_bitmap_offset(eb, start, pos, &i, &offset); | |
5942 | page = eb->pages[i]; | |
5943 | WARN_ON(!PageUptodate(page)); | |
5944 | kaddr = page_address(page); | |
5945 | ||
5946 | while (len >= bits_to_clear) { | |
5947 | kaddr[offset] &= ~mask_to_clear; | |
5948 | len -= bits_to_clear; | |
5949 | bits_to_clear = BITS_PER_BYTE; | |
9c894696 | 5950 | mask_to_clear = ~0; |
09cbfeaf | 5951 | if (++offset >= PAGE_SIZE && len > 0) { |
3e1e8bb7 OS |
5952 | offset = 0; |
5953 | page = eb->pages[++i]; | |
5954 | WARN_ON(!PageUptodate(page)); | |
5955 | kaddr = page_address(page); | |
5956 | } | |
5957 | } | |
5958 | if (len) { | |
5959 | mask_to_clear &= BITMAP_LAST_BYTE_MASK(size); | |
5960 | kaddr[offset] &= ~mask_to_clear; | |
5961 | } | |
5962 | } | |
5963 | ||
3387206f ST |
5964 | static inline bool areas_overlap(unsigned long src, unsigned long dst, unsigned long len) |
5965 | { | |
5966 | unsigned long distance = (src > dst) ? src - dst : dst - src; | |
5967 | return distance < len; | |
5968 | } | |
5969 | ||
d1310b2e CM |
5970 | static void copy_pages(struct page *dst_page, struct page *src_page, |
5971 | unsigned long dst_off, unsigned long src_off, | |
5972 | unsigned long len) | |
5973 | { | |
a6591715 | 5974 | char *dst_kaddr = page_address(dst_page); |
d1310b2e | 5975 | char *src_kaddr; |
727011e0 | 5976 | int must_memmove = 0; |
d1310b2e | 5977 | |
3387206f | 5978 | if (dst_page != src_page) { |
a6591715 | 5979 | src_kaddr = page_address(src_page); |
3387206f | 5980 | } else { |
d1310b2e | 5981 | src_kaddr = dst_kaddr; |
727011e0 CM |
5982 | if (areas_overlap(src_off, dst_off, len)) |
5983 | must_memmove = 1; | |
3387206f | 5984 | } |
d1310b2e | 5985 | |
727011e0 CM |
5986 | if (must_memmove) |
5987 | memmove(dst_kaddr + dst_off, src_kaddr + src_off, len); | |
5988 | else | |
5989 | memcpy(dst_kaddr + dst_off, src_kaddr + src_off, len); | |
d1310b2e CM |
5990 | } |
5991 | ||
5992 | void memcpy_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset, | |
5993 | unsigned long src_offset, unsigned long len) | |
5994 | { | |
0b246afa | 5995 | struct btrfs_fs_info *fs_info = dst->fs_info; |
d1310b2e CM |
5996 | size_t cur; |
5997 | size_t dst_off_in_page; | |
5998 | size_t src_off_in_page; | |
7073017a | 5999 | size_t start_offset = offset_in_page(dst->start); |
d1310b2e CM |
6000 | unsigned long dst_i; |
6001 | unsigned long src_i; | |
6002 | ||
6003 | if (src_offset + len > dst->len) { | |
0b246afa | 6004 | btrfs_err(fs_info, |
5d163e0e JM |
6005 | "memmove bogus src_offset %lu move len %lu dst len %lu", |
6006 | src_offset, len, dst->len); | |
290342f6 | 6007 | BUG(); |
d1310b2e CM |
6008 | } |
6009 | if (dst_offset + len > dst->len) { | |
0b246afa | 6010 | btrfs_err(fs_info, |
5d163e0e JM |
6011 | "memmove bogus dst_offset %lu move len %lu dst len %lu", |
6012 | dst_offset, len, dst->len); | |
290342f6 | 6013 | BUG(); |
d1310b2e CM |
6014 | } |
6015 | ||
d397712b | 6016 | while (len > 0) { |
7073017a JT |
6017 | dst_off_in_page = offset_in_page(start_offset + dst_offset); |
6018 | src_off_in_page = offset_in_page(start_offset + src_offset); | |
d1310b2e | 6019 | |
09cbfeaf KS |
6020 | dst_i = (start_offset + dst_offset) >> PAGE_SHIFT; |
6021 | src_i = (start_offset + src_offset) >> PAGE_SHIFT; | |
d1310b2e | 6022 | |
09cbfeaf | 6023 | cur = min(len, (unsigned long)(PAGE_SIZE - |
d1310b2e CM |
6024 | src_off_in_page)); |
6025 | cur = min_t(unsigned long, cur, | |
09cbfeaf | 6026 | (unsigned long)(PAGE_SIZE - dst_off_in_page)); |
d1310b2e | 6027 | |
fb85fc9a | 6028 | copy_pages(dst->pages[dst_i], dst->pages[src_i], |
d1310b2e CM |
6029 | dst_off_in_page, src_off_in_page, cur); |
6030 | ||
6031 | src_offset += cur; | |
6032 | dst_offset += cur; | |
6033 | len -= cur; | |
6034 | } | |
6035 | } | |
d1310b2e CM |
6036 | |
6037 | void memmove_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset, | |
6038 | unsigned long src_offset, unsigned long len) | |
6039 | { | |
0b246afa | 6040 | struct btrfs_fs_info *fs_info = dst->fs_info; |
d1310b2e CM |
6041 | size_t cur; |
6042 | size_t dst_off_in_page; | |
6043 | size_t src_off_in_page; | |
6044 | unsigned long dst_end = dst_offset + len - 1; | |
6045 | unsigned long src_end = src_offset + len - 1; | |
7073017a | 6046 | size_t start_offset = offset_in_page(dst->start); |
d1310b2e CM |
6047 | unsigned long dst_i; |
6048 | unsigned long src_i; | |
6049 | ||
6050 | if (src_offset + len > dst->len) { | |
0b246afa | 6051 | btrfs_err(fs_info, |
5d163e0e JM |
6052 | "memmove bogus src_offset %lu move len %lu len %lu", |
6053 | src_offset, len, dst->len); | |
290342f6 | 6054 | BUG(); |
d1310b2e CM |
6055 | } |
6056 | if (dst_offset + len > dst->len) { | |
0b246afa | 6057 | btrfs_err(fs_info, |
5d163e0e JM |
6058 | "memmove bogus dst_offset %lu move len %lu len %lu", |
6059 | dst_offset, len, dst->len); | |
290342f6 | 6060 | BUG(); |
d1310b2e | 6061 | } |
727011e0 | 6062 | if (dst_offset < src_offset) { |
d1310b2e CM |
6063 | memcpy_extent_buffer(dst, dst_offset, src_offset, len); |
6064 | return; | |
6065 | } | |
d397712b | 6066 | while (len > 0) { |
09cbfeaf KS |
6067 | dst_i = (start_offset + dst_end) >> PAGE_SHIFT; |
6068 | src_i = (start_offset + src_end) >> PAGE_SHIFT; | |
d1310b2e | 6069 | |
7073017a JT |
6070 | dst_off_in_page = offset_in_page(start_offset + dst_end); |
6071 | src_off_in_page = offset_in_page(start_offset + src_end); | |
d1310b2e CM |
6072 | |
6073 | cur = min_t(unsigned long, len, src_off_in_page + 1); | |
6074 | cur = min(cur, dst_off_in_page + 1); | |
fb85fc9a | 6075 | copy_pages(dst->pages[dst_i], dst->pages[src_i], |
d1310b2e CM |
6076 | dst_off_in_page - cur + 1, |
6077 | src_off_in_page - cur + 1, cur); | |
6078 | ||
6079 | dst_end -= cur; | |
6080 | src_end -= cur; | |
6081 | len -= cur; | |
6082 | } | |
6083 | } | |
6af118ce | 6084 | |
f7a52a40 | 6085 | int try_release_extent_buffer(struct page *page) |
19fe0a8b | 6086 | { |
6af118ce | 6087 | struct extent_buffer *eb; |
6af118ce | 6088 | |
3083ee2e | 6089 | /* |
01327610 | 6090 | * We need to make sure nobody is attaching this page to an eb right |
3083ee2e JB |
6091 | * now. |
6092 | */ | |
6093 | spin_lock(&page->mapping->private_lock); | |
6094 | if (!PagePrivate(page)) { | |
6095 | spin_unlock(&page->mapping->private_lock); | |
4f2de97a | 6096 | return 1; |
45f49bce | 6097 | } |
6af118ce | 6098 | |
3083ee2e JB |
6099 | eb = (struct extent_buffer *)page->private; |
6100 | BUG_ON(!eb); | |
19fe0a8b MX |
6101 | |
6102 | /* | |
3083ee2e JB |
6103 | * This is a little awful but should be ok, we need to make sure that |
6104 | * the eb doesn't disappear out from under us while we're looking at | |
6105 | * this page. | |
19fe0a8b | 6106 | */ |
3083ee2e | 6107 | spin_lock(&eb->refs_lock); |
0b32f4bb | 6108 | if (atomic_read(&eb->refs) != 1 || extent_buffer_under_io(eb)) { |
3083ee2e JB |
6109 | spin_unlock(&eb->refs_lock); |
6110 | spin_unlock(&page->mapping->private_lock); | |
6111 | return 0; | |
b9473439 | 6112 | } |
3083ee2e | 6113 | spin_unlock(&page->mapping->private_lock); |
897ca6e9 | 6114 | |
19fe0a8b | 6115 | /* |
3083ee2e JB |
6116 | * If tree ref isn't set then we know the ref on this eb is a real ref, |
6117 | * so just return, this page will likely be freed soon anyway. | |
19fe0a8b | 6118 | */ |
3083ee2e JB |
6119 | if (!test_and_clear_bit(EXTENT_BUFFER_TREE_REF, &eb->bflags)) { |
6120 | spin_unlock(&eb->refs_lock); | |
6121 | return 0; | |
b9473439 | 6122 | } |
19fe0a8b | 6123 | |
f7a52a40 | 6124 | return release_extent_buffer(eb); |
6af118ce | 6125 | } |