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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
d1310b2e CM |
2 | #include <linux/bitops.h> |
3 | #include <linux/slab.h> | |
4 | #include <linux/bio.h> | |
5 | #include <linux/mm.h> | |
d1310b2e CM |
6 | #include <linux/pagemap.h> |
7 | #include <linux/page-flags.h> | |
d1310b2e CM |
8 | #include <linux/spinlock.h> |
9 | #include <linux/blkdev.h> | |
10 | #include <linux/swap.h> | |
d1310b2e CM |
11 | #include <linux/writeback.h> |
12 | #include <linux/pagevec.h> | |
268bb0ce | 13 | #include <linux/prefetch.h> |
90a887c9 | 14 | #include <linux/cleancache.h> |
d1310b2e CM |
15 | #include "extent_io.h" |
16 | #include "extent_map.h" | |
902b22f3 DW |
17 | #include "ctree.h" |
18 | #include "btrfs_inode.h" | |
4a54c8c1 | 19 | #include "volumes.h" |
21adbd5c | 20 | #include "check-integrity.h" |
0b32f4bb | 21 | #include "locking.h" |
606686ee | 22 | #include "rcu-string.h" |
fe09e16c | 23 | #include "backref.h" |
6af49dbd | 24 | #include "disk-io.h" |
d1310b2e | 25 | |
d1310b2e CM |
26 | static struct kmem_cache *extent_state_cache; |
27 | static struct kmem_cache *extent_buffer_cache; | |
9be3395b | 28 | static struct bio_set *btrfs_bioset; |
d1310b2e | 29 | |
27a3507d FM |
30 | static inline bool extent_state_in_tree(const struct extent_state *state) |
31 | { | |
32 | return !RB_EMPTY_NODE(&state->rb_node); | |
33 | } | |
34 | ||
6d49ba1b | 35 | #ifdef CONFIG_BTRFS_DEBUG |
d1310b2e CM |
36 | static LIST_HEAD(buffers); |
37 | static LIST_HEAD(states); | |
4bef0848 | 38 | |
d397712b | 39 | static DEFINE_SPINLOCK(leak_lock); |
6d49ba1b ES |
40 | |
41 | static inline | |
42 | void btrfs_leak_debug_add(struct list_head *new, struct list_head *head) | |
43 | { | |
44 | unsigned long flags; | |
45 | ||
46 | spin_lock_irqsave(&leak_lock, flags); | |
47 | list_add(new, head); | |
48 | spin_unlock_irqrestore(&leak_lock, flags); | |
49 | } | |
50 | ||
51 | static inline | |
52 | void btrfs_leak_debug_del(struct list_head *entry) | |
53 | { | |
54 | unsigned long flags; | |
55 | ||
56 | spin_lock_irqsave(&leak_lock, flags); | |
57 | list_del(entry); | |
58 | spin_unlock_irqrestore(&leak_lock, flags); | |
59 | } | |
60 | ||
61 | static inline | |
62 | void btrfs_leak_debug_check(void) | |
63 | { | |
64 | struct extent_state *state; | |
65 | struct extent_buffer *eb; | |
66 | ||
67 | while (!list_empty(&states)) { | |
68 | state = list_entry(states.next, struct extent_state, leak_list); | |
9ee49a04 | 69 | pr_err("BTRFS: state leak: start %llu end %llu state %u in tree %d refs %d\n", |
27a3507d FM |
70 | state->start, state->end, state->state, |
71 | extent_state_in_tree(state), | |
b7ac31b7 | 72 | refcount_read(&state->refs)); |
6d49ba1b ES |
73 | list_del(&state->leak_list); |
74 | kmem_cache_free(extent_state_cache, state); | |
75 | } | |
76 | ||
77 | while (!list_empty(&buffers)) { | |
78 | eb = list_entry(buffers.next, struct extent_buffer, leak_list); | |
62e85577 | 79 | pr_err("BTRFS: buffer leak start %llu len %lu refs %d\n", |
c1c9ff7c | 80 | eb->start, eb->len, atomic_read(&eb->refs)); |
6d49ba1b ES |
81 | list_del(&eb->leak_list); |
82 | kmem_cache_free(extent_buffer_cache, eb); | |
83 | } | |
84 | } | |
8d599ae1 | 85 | |
a5dee37d JB |
86 | #define btrfs_debug_check_extent_io_range(tree, start, end) \ |
87 | __btrfs_debug_check_extent_io_range(__func__, (tree), (start), (end)) | |
8d599ae1 | 88 | static inline void __btrfs_debug_check_extent_io_range(const char *caller, |
a5dee37d | 89 | struct extent_io_tree *tree, u64 start, u64 end) |
8d599ae1 | 90 | { |
c6100a4b JB |
91 | if (tree->ops && tree->ops->check_extent_io_range) |
92 | tree->ops->check_extent_io_range(tree->private_data, caller, | |
93 | start, end); | |
8d599ae1 | 94 | } |
6d49ba1b ES |
95 | #else |
96 | #define btrfs_leak_debug_add(new, head) do {} while (0) | |
97 | #define btrfs_leak_debug_del(entry) do {} while (0) | |
98 | #define btrfs_leak_debug_check() do {} while (0) | |
8d599ae1 | 99 | #define btrfs_debug_check_extent_io_range(c, s, e) do {} while (0) |
4bef0848 | 100 | #endif |
d1310b2e | 101 | |
d1310b2e CM |
102 | #define BUFFER_LRU_MAX 64 |
103 | ||
104 | struct tree_entry { | |
105 | u64 start; | |
106 | u64 end; | |
d1310b2e CM |
107 | struct rb_node rb_node; |
108 | }; | |
109 | ||
110 | struct extent_page_data { | |
111 | struct bio *bio; | |
112 | struct extent_io_tree *tree; | |
771ed689 CM |
113 | /* tells writepage not to lock the state bits for this range |
114 | * it still does the unlocking | |
115 | */ | |
ffbd517d CM |
116 | unsigned int extent_locked:1; |
117 | ||
70fd7614 | 118 | /* tells the submit_bio code to use REQ_SYNC */ |
ffbd517d | 119 | unsigned int sync_io:1; |
d1310b2e CM |
120 | }; |
121 | ||
d38ed27f QW |
122 | static void add_extent_changeset(struct extent_state *state, unsigned bits, |
123 | struct extent_changeset *changeset, | |
124 | int set) | |
125 | { | |
126 | int ret; | |
127 | ||
128 | if (!changeset) | |
129 | return; | |
130 | if (set && (state->state & bits) == bits) | |
131 | return; | |
fefdc557 QW |
132 | if (!set && (state->state & bits) == 0) |
133 | return; | |
d38ed27f | 134 | changeset->bytes_changed += state->end - state->start + 1; |
53d32359 | 135 | ret = ulist_add(&changeset->range_changed, state->start, state->end, |
d38ed27f QW |
136 | GFP_ATOMIC); |
137 | /* ENOMEM */ | |
138 | BUG_ON(ret < 0); | |
139 | } | |
140 | ||
0b32f4bb | 141 | static noinline void flush_write_bio(void *data); |
c2d904e0 JM |
142 | static inline struct btrfs_fs_info * |
143 | tree_fs_info(struct extent_io_tree *tree) | |
144 | { | |
c6100a4b JB |
145 | if (tree->ops) |
146 | return tree->ops->tree_fs_info(tree->private_data); | |
147 | return NULL; | |
c2d904e0 | 148 | } |
0b32f4bb | 149 | |
d1310b2e CM |
150 | int __init extent_io_init(void) |
151 | { | |
837e1972 | 152 | extent_state_cache = kmem_cache_create("btrfs_extent_state", |
9601e3f6 | 153 | sizeof(struct extent_state), 0, |
fba4b697 | 154 | SLAB_MEM_SPREAD, NULL); |
d1310b2e CM |
155 | if (!extent_state_cache) |
156 | return -ENOMEM; | |
157 | ||
837e1972 | 158 | extent_buffer_cache = kmem_cache_create("btrfs_extent_buffer", |
9601e3f6 | 159 | sizeof(struct extent_buffer), 0, |
fba4b697 | 160 | SLAB_MEM_SPREAD, NULL); |
d1310b2e CM |
161 | if (!extent_buffer_cache) |
162 | goto free_state_cache; | |
9be3395b CM |
163 | |
164 | btrfs_bioset = bioset_create(BIO_POOL_SIZE, | |
011067b0 N |
165 | offsetof(struct btrfs_io_bio, bio), |
166 | BIOSET_NEED_BVECS); | |
9be3395b CM |
167 | if (!btrfs_bioset) |
168 | goto free_buffer_cache; | |
b208c2f7 DW |
169 | |
170 | if (bioset_integrity_create(btrfs_bioset, BIO_POOL_SIZE)) | |
171 | goto free_bioset; | |
172 | ||
d1310b2e CM |
173 | return 0; |
174 | ||
b208c2f7 DW |
175 | free_bioset: |
176 | bioset_free(btrfs_bioset); | |
177 | btrfs_bioset = NULL; | |
178 | ||
9be3395b CM |
179 | free_buffer_cache: |
180 | kmem_cache_destroy(extent_buffer_cache); | |
181 | extent_buffer_cache = NULL; | |
182 | ||
d1310b2e CM |
183 | free_state_cache: |
184 | kmem_cache_destroy(extent_state_cache); | |
9be3395b | 185 | extent_state_cache = NULL; |
d1310b2e CM |
186 | return -ENOMEM; |
187 | } | |
188 | ||
189 | void extent_io_exit(void) | |
190 | { | |
6d49ba1b | 191 | btrfs_leak_debug_check(); |
8c0a8537 KS |
192 | |
193 | /* | |
194 | * Make sure all delayed rcu free are flushed before we | |
195 | * destroy caches. | |
196 | */ | |
197 | rcu_barrier(); | |
5598e900 KM |
198 | kmem_cache_destroy(extent_state_cache); |
199 | kmem_cache_destroy(extent_buffer_cache); | |
9be3395b CM |
200 | if (btrfs_bioset) |
201 | bioset_free(btrfs_bioset); | |
d1310b2e CM |
202 | } |
203 | ||
204 | void extent_io_tree_init(struct extent_io_tree *tree, | |
c6100a4b | 205 | void *private_data) |
d1310b2e | 206 | { |
6bef4d31 | 207 | tree->state = RB_ROOT; |
d1310b2e CM |
208 | tree->ops = NULL; |
209 | tree->dirty_bytes = 0; | |
70dec807 | 210 | spin_lock_init(&tree->lock); |
c6100a4b | 211 | tree->private_data = private_data; |
d1310b2e | 212 | } |
d1310b2e | 213 | |
b2950863 | 214 | static struct extent_state *alloc_extent_state(gfp_t mask) |
d1310b2e CM |
215 | { |
216 | struct extent_state *state; | |
d1310b2e | 217 | |
3ba7ab22 MH |
218 | /* |
219 | * The given mask might be not appropriate for the slab allocator, | |
220 | * drop the unsupported bits | |
221 | */ | |
222 | mask &= ~(__GFP_DMA32|__GFP_HIGHMEM); | |
d1310b2e | 223 | state = kmem_cache_alloc(extent_state_cache, mask); |
2b114d1d | 224 | if (!state) |
d1310b2e CM |
225 | return state; |
226 | state->state = 0; | |
47dc196a | 227 | state->failrec = NULL; |
27a3507d | 228 | RB_CLEAR_NODE(&state->rb_node); |
6d49ba1b | 229 | btrfs_leak_debug_add(&state->leak_list, &states); |
b7ac31b7 | 230 | refcount_set(&state->refs, 1); |
d1310b2e | 231 | init_waitqueue_head(&state->wq); |
143bede5 | 232 | trace_alloc_extent_state(state, mask, _RET_IP_); |
d1310b2e CM |
233 | return state; |
234 | } | |
d1310b2e | 235 | |
4845e44f | 236 | void free_extent_state(struct extent_state *state) |
d1310b2e | 237 | { |
d1310b2e CM |
238 | if (!state) |
239 | return; | |
b7ac31b7 | 240 | if (refcount_dec_and_test(&state->refs)) { |
27a3507d | 241 | WARN_ON(extent_state_in_tree(state)); |
6d49ba1b | 242 | btrfs_leak_debug_del(&state->leak_list); |
143bede5 | 243 | trace_free_extent_state(state, _RET_IP_); |
d1310b2e CM |
244 | kmem_cache_free(extent_state_cache, state); |
245 | } | |
246 | } | |
d1310b2e | 247 | |
f2071b21 FM |
248 | static struct rb_node *tree_insert(struct rb_root *root, |
249 | struct rb_node *search_start, | |
250 | u64 offset, | |
12cfbad9 FDBM |
251 | struct rb_node *node, |
252 | struct rb_node ***p_in, | |
253 | struct rb_node **parent_in) | |
d1310b2e | 254 | { |
f2071b21 | 255 | struct rb_node **p; |
d397712b | 256 | struct rb_node *parent = NULL; |
d1310b2e CM |
257 | struct tree_entry *entry; |
258 | ||
12cfbad9 FDBM |
259 | if (p_in && parent_in) { |
260 | p = *p_in; | |
261 | parent = *parent_in; | |
262 | goto do_insert; | |
263 | } | |
264 | ||
f2071b21 | 265 | p = search_start ? &search_start : &root->rb_node; |
d397712b | 266 | while (*p) { |
d1310b2e CM |
267 | parent = *p; |
268 | entry = rb_entry(parent, struct tree_entry, rb_node); | |
269 | ||
270 | if (offset < entry->start) | |
271 | p = &(*p)->rb_left; | |
272 | else if (offset > entry->end) | |
273 | p = &(*p)->rb_right; | |
274 | else | |
275 | return parent; | |
276 | } | |
277 | ||
12cfbad9 | 278 | do_insert: |
d1310b2e CM |
279 | rb_link_node(node, parent, p); |
280 | rb_insert_color(node, root); | |
281 | return NULL; | |
282 | } | |
283 | ||
80ea96b1 | 284 | static struct rb_node *__etree_search(struct extent_io_tree *tree, u64 offset, |
12cfbad9 FDBM |
285 | struct rb_node **prev_ret, |
286 | struct rb_node **next_ret, | |
287 | struct rb_node ***p_ret, | |
288 | struct rb_node **parent_ret) | |
d1310b2e | 289 | { |
80ea96b1 | 290 | struct rb_root *root = &tree->state; |
12cfbad9 | 291 | struct rb_node **n = &root->rb_node; |
d1310b2e CM |
292 | struct rb_node *prev = NULL; |
293 | struct rb_node *orig_prev = NULL; | |
294 | struct tree_entry *entry; | |
295 | struct tree_entry *prev_entry = NULL; | |
296 | ||
12cfbad9 FDBM |
297 | while (*n) { |
298 | prev = *n; | |
299 | entry = rb_entry(prev, struct tree_entry, rb_node); | |
d1310b2e CM |
300 | prev_entry = entry; |
301 | ||
302 | if (offset < entry->start) | |
12cfbad9 | 303 | n = &(*n)->rb_left; |
d1310b2e | 304 | else if (offset > entry->end) |
12cfbad9 | 305 | n = &(*n)->rb_right; |
d397712b | 306 | else |
12cfbad9 | 307 | return *n; |
d1310b2e CM |
308 | } |
309 | ||
12cfbad9 FDBM |
310 | if (p_ret) |
311 | *p_ret = n; | |
312 | if (parent_ret) | |
313 | *parent_ret = prev; | |
314 | ||
d1310b2e CM |
315 | if (prev_ret) { |
316 | orig_prev = prev; | |
d397712b | 317 | while (prev && offset > prev_entry->end) { |
d1310b2e CM |
318 | prev = rb_next(prev); |
319 | prev_entry = rb_entry(prev, struct tree_entry, rb_node); | |
320 | } | |
321 | *prev_ret = prev; | |
322 | prev = orig_prev; | |
323 | } | |
324 | ||
325 | if (next_ret) { | |
326 | prev_entry = rb_entry(prev, struct tree_entry, rb_node); | |
d397712b | 327 | while (prev && offset < prev_entry->start) { |
d1310b2e CM |
328 | prev = rb_prev(prev); |
329 | prev_entry = rb_entry(prev, struct tree_entry, rb_node); | |
330 | } | |
331 | *next_ret = prev; | |
332 | } | |
333 | return NULL; | |
334 | } | |
335 | ||
12cfbad9 FDBM |
336 | static inline struct rb_node * |
337 | tree_search_for_insert(struct extent_io_tree *tree, | |
338 | u64 offset, | |
339 | struct rb_node ***p_ret, | |
340 | struct rb_node **parent_ret) | |
d1310b2e | 341 | { |
70dec807 | 342 | struct rb_node *prev = NULL; |
d1310b2e | 343 | struct rb_node *ret; |
70dec807 | 344 | |
12cfbad9 | 345 | ret = __etree_search(tree, offset, &prev, NULL, p_ret, parent_ret); |
d397712b | 346 | if (!ret) |
d1310b2e CM |
347 | return prev; |
348 | return ret; | |
349 | } | |
350 | ||
12cfbad9 FDBM |
351 | static inline struct rb_node *tree_search(struct extent_io_tree *tree, |
352 | u64 offset) | |
353 | { | |
354 | return tree_search_for_insert(tree, offset, NULL, NULL); | |
355 | } | |
356 | ||
9ed74f2d JB |
357 | static void merge_cb(struct extent_io_tree *tree, struct extent_state *new, |
358 | struct extent_state *other) | |
359 | { | |
360 | if (tree->ops && tree->ops->merge_extent_hook) | |
c6100a4b | 361 | tree->ops->merge_extent_hook(tree->private_data, new, other); |
9ed74f2d JB |
362 | } |
363 | ||
d1310b2e CM |
364 | /* |
365 | * utility function to look for merge candidates inside a given range. | |
366 | * Any extents with matching state are merged together into a single | |
367 | * extent in the tree. Extents with EXTENT_IO in their state field | |
368 | * are not merged because the end_io handlers need to be able to do | |
369 | * operations on them without sleeping (or doing allocations/splits). | |
370 | * | |
371 | * This should be called with the tree lock held. | |
372 | */ | |
1bf85046 JM |
373 | static void merge_state(struct extent_io_tree *tree, |
374 | struct extent_state *state) | |
d1310b2e CM |
375 | { |
376 | struct extent_state *other; | |
377 | struct rb_node *other_node; | |
378 | ||
5b21f2ed | 379 | if (state->state & (EXTENT_IOBITS | EXTENT_BOUNDARY)) |
1bf85046 | 380 | return; |
d1310b2e CM |
381 | |
382 | other_node = rb_prev(&state->rb_node); | |
383 | if (other_node) { | |
384 | other = rb_entry(other_node, struct extent_state, rb_node); | |
385 | if (other->end == state->start - 1 && | |
386 | other->state == state->state) { | |
9ed74f2d | 387 | merge_cb(tree, state, other); |
d1310b2e | 388 | state->start = other->start; |
d1310b2e | 389 | rb_erase(&other->rb_node, &tree->state); |
27a3507d | 390 | RB_CLEAR_NODE(&other->rb_node); |
d1310b2e CM |
391 | free_extent_state(other); |
392 | } | |
393 | } | |
394 | other_node = rb_next(&state->rb_node); | |
395 | if (other_node) { | |
396 | other = rb_entry(other_node, struct extent_state, rb_node); | |
397 | if (other->start == state->end + 1 && | |
398 | other->state == state->state) { | |
9ed74f2d | 399 | merge_cb(tree, state, other); |
df98b6e2 | 400 | state->end = other->end; |
df98b6e2 | 401 | rb_erase(&other->rb_node, &tree->state); |
27a3507d | 402 | RB_CLEAR_NODE(&other->rb_node); |
df98b6e2 | 403 | free_extent_state(other); |
d1310b2e CM |
404 | } |
405 | } | |
d1310b2e CM |
406 | } |
407 | ||
1bf85046 | 408 | static void set_state_cb(struct extent_io_tree *tree, |
9ee49a04 | 409 | struct extent_state *state, unsigned *bits) |
291d673e | 410 | { |
1bf85046 | 411 | if (tree->ops && tree->ops->set_bit_hook) |
c6100a4b | 412 | tree->ops->set_bit_hook(tree->private_data, state, bits); |
291d673e CM |
413 | } |
414 | ||
415 | static void clear_state_cb(struct extent_io_tree *tree, | |
9ee49a04 | 416 | struct extent_state *state, unsigned *bits) |
291d673e | 417 | { |
9ed74f2d | 418 | if (tree->ops && tree->ops->clear_bit_hook) |
c6100a4b | 419 | tree->ops->clear_bit_hook(tree->private_data, state, bits); |
291d673e CM |
420 | } |
421 | ||
3150b699 | 422 | static void set_state_bits(struct extent_io_tree *tree, |
d38ed27f QW |
423 | struct extent_state *state, unsigned *bits, |
424 | struct extent_changeset *changeset); | |
3150b699 | 425 | |
d1310b2e CM |
426 | /* |
427 | * insert an extent_state struct into the tree. 'bits' are set on the | |
428 | * struct before it is inserted. | |
429 | * | |
430 | * This may return -EEXIST if the extent is already there, in which case the | |
431 | * state struct is freed. | |
432 | * | |
433 | * The tree lock is not taken internally. This is a utility function and | |
434 | * probably isn't what you want to call (see set/clear_extent_bit). | |
435 | */ | |
436 | static int insert_state(struct extent_io_tree *tree, | |
437 | struct extent_state *state, u64 start, u64 end, | |
12cfbad9 FDBM |
438 | struct rb_node ***p, |
439 | struct rb_node **parent, | |
d38ed27f | 440 | unsigned *bits, struct extent_changeset *changeset) |
d1310b2e CM |
441 | { |
442 | struct rb_node *node; | |
443 | ||
31b1a2bd | 444 | if (end < start) |
efe120a0 | 445 | WARN(1, KERN_ERR "BTRFS: end < start %llu %llu\n", |
c1c9ff7c | 446 | end, start); |
d1310b2e CM |
447 | state->start = start; |
448 | state->end = end; | |
9ed74f2d | 449 | |
d38ed27f | 450 | set_state_bits(tree, state, bits, changeset); |
3150b699 | 451 | |
f2071b21 | 452 | node = tree_insert(&tree->state, NULL, end, &state->rb_node, p, parent); |
d1310b2e CM |
453 | if (node) { |
454 | struct extent_state *found; | |
455 | found = rb_entry(node, struct extent_state, rb_node); | |
62e85577 | 456 | pr_err("BTRFS: found node %llu %llu on insert of %llu %llu\n", |
c1c9ff7c | 457 | found->start, found->end, start, end); |
d1310b2e CM |
458 | return -EEXIST; |
459 | } | |
460 | merge_state(tree, state); | |
461 | return 0; | |
462 | } | |
463 | ||
1bf85046 | 464 | static void split_cb(struct extent_io_tree *tree, struct extent_state *orig, |
9ed74f2d JB |
465 | u64 split) |
466 | { | |
467 | if (tree->ops && tree->ops->split_extent_hook) | |
c6100a4b | 468 | tree->ops->split_extent_hook(tree->private_data, orig, split); |
9ed74f2d JB |
469 | } |
470 | ||
d1310b2e CM |
471 | /* |
472 | * split a given extent state struct in two, inserting the preallocated | |
473 | * struct 'prealloc' as the newly created second half. 'split' indicates an | |
474 | * offset inside 'orig' where it should be split. | |
475 | * | |
476 | * Before calling, | |
477 | * the tree has 'orig' at [orig->start, orig->end]. After calling, there | |
478 | * are two extent state structs in the tree: | |
479 | * prealloc: [orig->start, split - 1] | |
480 | * orig: [ split, orig->end ] | |
481 | * | |
482 | * The tree locks are not taken by this function. They need to be held | |
483 | * by the caller. | |
484 | */ | |
485 | static int split_state(struct extent_io_tree *tree, struct extent_state *orig, | |
486 | struct extent_state *prealloc, u64 split) | |
487 | { | |
488 | struct rb_node *node; | |
9ed74f2d JB |
489 | |
490 | split_cb(tree, orig, split); | |
491 | ||
d1310b2e CM |
492 | prealloc->start = orig->start; |
493 | prealloc->end = split - 1; | |
494 | prealloc->state = orig->state; | |
495 | orig->start = split; | |
496 | ||
f2071b21 FM |
497 | node = tree_insert(&tree->state, &orig->rb_node, prealloc->end, |
498 | &prealloc->rb_node, NULL, NULL); | |
d1310b2e | 499 | if (node) { |
d1310b2e CM |
500 | free_extent_state(prealloc); |
501 | return -EEXIST; | |
502 | } | |
503 | return 0; | |
504 | } | |
505 | ||
cdc6a395 LZ |
506 | static struct extent_state *next_state(struct extent_state *state) |
507 | { | |
508 | struct rb_node *next = rb_next(&state->rb_node); | |
509 | if (next) | |
510 | return rb_entry(next, struct extent_state, rb_node); | |
511 | else | |
512 | return NULL; | |
513 | } | |
514 | ||
d1310b2e CM |
515 | /* |
516 | * utility function to clear some bits in an extent state struct. | |
1b303fc0 | 517 | * it will optionally wake up any one waiting on this state (wake == 1). |
d1310b2e CM |
518 | * |
519 | * If no bits are set on the state struct after clearing things, the | |
520 | * struct is freed and removed from the tree | |
521 | */ | |
cdc6a395 LZ |
522 | static struct extent_state *clear_state_bit(struct extent_io_tree *tree, |
523 | struct extent_state *state, | |
fefdc557 QW |
524 | unsigned *bits, int wake, |
525 | struct extent_changeset *changeset) | |
d1310b2e | 526 | { |
cdc6a395 | 527 | struct extent_state *next; |
9ee49a04 | 528 | unsigned bits_to_clear = *bits & ~EXTENT_CTLBITS; |
d1310b2e | 529 | |
0ca1f7ce | 530 | if ((bits_to_clear & EXTENT_DIRTY) && (state->state & EXTENT_DIRTY)) { |
d1310b2e CM |
531 | u64 range = state->end - state->start + 1; |
532 | WARN_ON(range > tree->dirty_bytes); | |
533 | tree->dirty_bytes -= range; | |
534 | } | |
291d673e | 535 | clear_state_cb(tree, state, bits); |
fefdc557 | 536 | add_extent_changeset(state, bits_to_clear, changeset, 0); |
32c00aff | 537 | state->state &= ~bits_to_clear; |
d1310b2e CM |
538 | if (wake) |
539 | wake_up(&state->wq); | |
0ca1f7ce | 540 | if (state->state == 0) { |
cdc6a395 | 541 | next = next_state(state); |
27a3507d | 542 | if (extent_state_in_tree(state)) { |
d1310b2e | 543 | rb_erase(&state->rb_node, &tree->state); |
27a3507d | 544 | RB_CLEAR_NODE(&state->rb_node); |
d1310b2e CM |
545 | free_extent_state(state); |
546 | } else { | |
547 | WARN_ON(1); | |
548 | } | |
549 | } else { | |
550 | merge_state(tree, state); | |
cdc6a395 | 551 | next = next_state(state); |
d1310b2e | 552 | } |
cdc6a395 | 553 | return next; |
d1310b2e CM |
554 | } |
555 | ||
8233767a XG |
556 | static struct extent_state * |
557 | alloc_extent_state_atomic(struct extent_state *prealloc) | |
558 | { | |
559 | if (!prealloc) | |
560 | prealloc = alloc_extent_state(GFP_ATOMIC); | |
561 | ||
562 | return prealloc; | |
563 | } | |
564 | ||
48a3b636 | 565 | static void extent_io_tree_panic(struct extent_io_tree *tree, int err) |
c2d904e0 | 566 | { |
5d163e0e JM |
567 | btrfs_panic(tree_fs_info(tree), err, |
568 | "Locking error: Extent tree was modified by another thread while locked."); | |
c2d904e0 JM |
569 | } |
570 | ||
d1310b2e CM |
571 | /* |
572 | * clear some bits on a range in the tree. This may require splitting | |
573 | * or inserting elements in the tree, so the gfp mask is used to | |
574 | * indicate which allocations or sleeping are allowed. | |
575 | * | |
576 | * pass 'wake' == 1 to kick any sleepers, and 'delete' == 1 to remove | |
577 | * the given range from the tree regardless of state (ie for truncate). | |
578 | * | |
579 | * the range [start, end] is inclusive. | |
580 | * | |
6763af84 | 581 | * This takes the tree lock, and returns 0 on success and < 0 on error. |
d1310b2e | 582 | */ |
66b0c887 | 583 | int __clear_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, |
fefdc557 QW |
584 | unsigned bits, int wake, int delete, |
585 | struct extent_state **cached_state, | |
586 | gfp_t mask, struct extent_changeset *changeset) | |
d1310b2e CM |
587 | { |
588 | struct extent_state *state; | |
2c64c53d | 589 | struct extent_state *cached; |
d1310b2e CM |
590 | struct extent_state *prealloc = NULL; |
591 | struct rb_node *node; | |
5c939df5 | 592 | u64 last_end; |
d1310b2e | 593 | int err; |
2ac55d41 | 594 | int clear = 0; |
d1310b2e | 595 | |
a5dee37d | 596 | btrfs_debug_check_extent_io_range(tree, start, end); |
8d599ae1 | 597 | |
7ee9e440 JB |
598 | if (bits & EXTENT_DELALLOC) |
599 | bits |= EXTENT_NORESERVE; | |
600 | ||
0ca1f7ce YZ |
601 | if (delete) |
602 | bits |= ~EXTENT_CTLBITS; | |
603 | bits |= EXTENT_FIRST_DELALLOC; | |
604 | ||
2ac55d41 JB |
605 | if (bits & (EXTENT_IOBITS | EXTENT_BOUNDARY)) |
606 | clear = 1; | |
d1310b2e | 607 | again: |
d0164adc | 608 | if (!prealloc && gfpflags_allow_blocking(mask)) { |
c7bc6319 FM |
609 | /* |
610 | * Don't care for allocation failure here because we might end | |
611 | * up not needing the pre-allocated extent state at all, which | |
612 | * is the case if we only have in the tree extent states that | |
613 | * cover our input range and don't cover too any other range. | |
614 | * If we end up needing a new extent state we allocate it later. | |
615 | */ | |
d1310b2e | 616 | prealloc = alloc_extent_state(mask); |
d1310b2e CM |
617 | } |
618 | ||
cad321ad | 619 | spin_lock(&tree->lock); |
2c64c53d CM |
620 | if (cached_state) { |
621 | cached = *cached_state; | |
2ac55d41 JB |
622 | |
623 | if (clear) { | |
624 | *cached_state = NULL; | |
625 | cached_state = NULL; | |
626 | } | |
627 | ||
27a3507d FM |
628 | if (cached && extent_state_in_tree(cached) && |
629 | cached->start <= start && cached->end > start) { | |
2ac55d41 | 630 | if (clear) |
b7ac31b7 | 631 | refcount_dec(&cached->refs); |
2c64c53d | 632 | state = cached; |
42daec29 | 633 | goto hit_next; |
2c64c53d | 634 | } |
2ac55d41 JB |
635 | if (clear) |
636 | free_extent_state(cached); | |
2c64c53d | 637 | } |
d1310b2e CM |
638 | /* |
639 | * this search will find the extents that end after | |
640 | * our range starts | |
641 | */ | |
80ea96b1 | 642 | node = tree_search(tree, start); |
d1310b2e CM |
643 | if (!node) |
644 | goto out; | |
645 | state = rb_entry(node, struct extent_state, rb_node); | |
2c64c53d | 646 | hit_next: |
d1310b2e CM |
647 | if (state->start > end) |
648 | goto out; | |
649 | WARN_ON(state->end < start); | |
5c939df5 | 650 | last_end = state->end; |
d1310b2e | 651 | |
0449314a | 652 | /* the state doesn't have the wanted bits, go ahead */ |
cdc6a395 LZ |
653 | if (!(state->state & bits)) { |
654 | state = next_state(state); | |
0449314a | 655 | goto next; |
cdc6a395 | 656 | } |
0449314a | 657 | |
d1310b2e CM |
658 | /* |
659 | * | ---- desired range ---- | | |
660 | * | state | or | |
661 | * | ------------- state -------------- | | |
662 | * | |
663 | * We need to split the extent we found, and may flip | |
664 | * bits on second half. | |
665 | * | |
666 | * If the extent we found extends past our range, we | |
667 | * just split and search again. It'll get split again | |
668 | * the next time though. | |
669 | * | |
670 | * If the extent we found is inside our range, we clear | |
671 | * the desired bit on it. | |
672 | */ | |
673 | ||
674 | if (state->start < start) { | |
8233767a XG |
675 | prealloc = alloc_extent_state_atomic(prealloc); |
676 | BUG_ON(!prealloc); | |
d1310b2e | 677 | err = split_state(tree, state, prealloc, start); |
c2d904e0 JM |
678 | if (err) |
679 | extent_io_tree_panic(tree, err); | |
680 | ||
d1310b2e CM |
681 | prealloc = NULL; |
682 | if (err) | |
683 | goto out; | |
684 | if (state->end <= end) { | |
fefdc557 QW |
685 | state = clear_state_bit(tree, state, &bits, wake, |
686 | changeset); | |
d1ac6e41 | 687 | goto next; |
d1310b2e CM |
688 | } |
689 | goto search_again; | |
690 | } | |
691 | /* | |
692 | * | ---- desired range ---- | | |
693 | * | state | | |
694 | * We need to split the extent, and clear the bit | |
695 | * on the first half | |
696 | */ | |
697 | if (state->start <= end && state->end > end) { | |
8233767a XG |
698 | prealloc = alloc_extent_state_atomic(prealloc); |
699 | BUG_ON(!prealloc); | |
d1310b2e | 700 | err = split_state(tree, state, prealloc, end + 1); |
c2d904e0 JM |
701 | if (err) |
702 | extent_io_tree_panic(tree, err); | |
703 | ||
d1310b2e CM |
704 | if (wake) |
705 | wake_up(&state->wq); | |
42daec29 | 706 | |
fefdc557 | 707 | clear_state_bit(tree, prealloc, &bits, wake, changeset); |
9ed74f2d | 708 | |
d1310b2e CM |
709 | prealloc = NULL; |
710 | goto out; | |
711 | } | |
42daec29 | 712 | |
fefdc557 | 713 | state = clear_state_bit(tree, state, &bits, wake, changeset); |
0449314a | 714 | next: |
5c939df5 YZ |
715 | if (last_end == (u64)-1) |
716 | goto out; | |
717 | start = last_end + 1; | |
cdc6a395 | 718 | if (start <= end && state && !need_resched()) |
692e5759 | 719 | goto hit_next; |
d1310b2e CM |
720 | |
721 | search_again: | |
722 | if (start > end) | |
723 | goto out; | |
cad321ad | 724 | spin_unlock(&tree->lock); |
d0164adc | 725 | if (gfpflags_allow_blocking(mask)) |
d1310b2e CM |
726 | cond_resched(); |
727 | goto again; | |
7ab5cb2a DS |
728 | |
729 | out: | |
730 | spin_unlock(&tree->lock); | |
731 | if (prealloc) | |
732 | free_extent_state(prealloc); | |
733 | ||
734 | return 0; | |
735 | ||
d1310b2e | 736 | } |
d1310b2e | 737 | |
143bede5 JM |
738 | static void wait_on_state(struct extent_io_tree *tree, |
739 | struct extent_state *state) | |
641f5219 CH |
740 | __releases(tree->lock) |
741 | __acquires(tree->lock) | |
d1310b2e CM |
742 | { |
743 | DEFINE_WAIT(wait); | |
744 | prepare_to_wait(&state->wq, &wait, TASK_UNINTERRUPTIBLE); | |
cad321ad | 745 | spin_unlock(&tree->lock); |
d1310b2e | 746 | schedule(); |
cad321ad | 747 | spin_lock(&tree->lock); |
d1310b2e | 748 | finish_wait(&state->wq, &wait); |
d1310b2e CM |
749 | } |
750 | ||
751 | /* | |
752 | * waits for one or more bits to clear on a range in the state tree. | |
753 | * The range [start, end] is inclusive. | |
754 | * The tree lock is taken by this function | |
755 | */ | |
41074888 DS |
756 | static void wait_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, |
757 | unsigned long bits) | |
d1310b2e CM |
758 | { |
759 | struct extent_state *state; | |
760 | struct rb_node *node; | |
761 | ||
a5dee37d | 762 | btrfs_debug_check_extent_io_range(tree, start, end); |
8d599ae1 | 763 | |
cad321ad | 764 | spin_lock(&tree->lock); |
d1310b2e CM |
765 | again: |
766 | while (1) { | |
767 | /* | |
768 | * this search will find all the extents that end after | |
769 | * our range starts | |
770 | */ | |
80ea96b1 | 771 | node = tree_search(tree, start); |
c50d3e71 | 772 | process_node: |
d1310b2e CM |
773 | if (!node) |
774 | break; | |
775 | ||
776 | state = rb_entry(node, struct extent_state, rb_node); | |
777 | ||
778 | if (state->start > end) | |
779 | goto out; | |
780 | ||
781 | if (state->state & bits) { | |
782 | start = state->start; | |
b7ac31b7 | 783 | refcount_inc(&state->refs); |
d1310b2e CM |
784 | wait_on_state(tree, state); |
785 | free_extent_state(state); | |
786 | goto again; | |
787 | } | |
788 | start = state->end + 1; | |
789 | ||
790 | if (start > end) | |
791 | break; | |
792 | ||
c50d3e71 FM |
793 | if (!cond_resched_lock(&tree->lock)) { |
794 | node = rb_next(node); | |
795 | goto process_node; | |
796 | } | |
d1310b2e CM |
797 | } |
798 | out: | |
cad321ad | 799 | spin_unlock(&tree->lock); |
d1310b2e | 800 | } |
d1310b2e | 801 | |
1bf85046 | 802 | static void set_state_bits(struct extent_io_tree *tree, |
d1310b2e | 803 | struct extent_state *state, |
d38ed27f | 804 | unsigned *bits, struct extent_changeset *changeset) |
d1310b2e | 805 | { |
9ee49a04 | 806 | unsigned bits_to_set = *bits & ~EXTENT_CTLBITS; |
9ed74f2d | 807 | |
1bf85046 | 808 | set_state_cb(tree, state, bits); |
0ca1f7ce | 809 | if ((bits_to_set & EXTENT_DIRTY) && !(state->state & EXTENT_DIRTY)) { |
d1310b2e CM |
810 | u64 range = state->end - state->start + 1; |
811 | tree->dirty_bytes += range; | |
812 | } | |
d38ed27f | 813 | add_extent_changeset(state, bits_to_set, changeset, 1); |
0ca1f7ce | 814 | state->state |= bits_to_set; |
d1310b2e CM |
815 | } |
816 | ||
e38e2ed7 FM |
817 | static void cache_state_if_flags(struct extent_state *state, |
818 | struct extent_state **cached_ptr, | |
9ee49a04 | 819 | unsigned flags) |
2c64c53d CM |
820 | { |
821 | if (cached_ptr && !(*cached_ptr)) { | |
e38e2ed7 | 822 | if (!flags || (state->state & flags)) { |
2c64c53d | 823 | *cached_ptr = state; |
b7ac31b7 | 824 | refcount_inc(&state->refs); |
2c64c53d CM |
825 | } |
826 | } | |
827 | } | |
828 | ||
e38e2ed7 FM |
829 | static void cache_state(struct extent_state *state, |
830 | struct extent_state **cached_ptr) | |
831 | { | |
832 | return cache_state_if_flags(state, cached_ptr, | |
833 | EXTENT_IOBITS | EXTENT_BOUNDARY); | |
834 | } | |
835 | ||
d1310b2e | 836 | /* |
1edbb734 CM |
837 | * set some bits on a range in the tree. This may require allocations or |
838 | * sleeping, so the gfp mask is used to indicate what is allowed. | |
d1310b2e | 839 | * |
1edbb734 CM |
840 | * If any of the exclusive bits are set, this will fail with -EEXIST if some |
841 | * part of the range already has the desired bits set. The start of the | |
842 | * existing range is returned in failed_start in this case. | |
d1310b2e | 843 | * |
1edbb734 | 844 | * [start, end] is inclusive This takes the tree lock. |
d1310b2e | 845 | */ |
1edbb734 | 846 | |
3fbe5c02 JM |
847 | static int __must_check |
848 | __set_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, | |
9ee49a04 | 849 | unsigned bits, unsigned exclusive_bits, |
41074888 | 850 | u64 *failed_start, struct extent_state **cached_state, |
d38ed27f | 851 | gfp_t mask, struct extent_changeset *changeset) |
d1310b2e CM |
852 | { |
853 | struct extent_state *state; | |
854 | struct extent_state *prealloc = NULL; | |
855 | struct rb_node *node; | |
12cfbad9 FDBM |
856 | struct rb_node **p; |
857 | struct rb_node *parent; | |
d1310b2e | 858 | int err = 0; |
d1310b2e CM |
859 | u64 last_start; |
860 | u64 last_end; | |
42daec29 | 861 | |
a5dee37d | 862 | btrfs_debug_check_extent_io_range(tree, start, end); |
8d599ae1 | 863 | |
0ca1f7ce | 864 | bits |= EXTENT_FIRST_DELALLOC; |
d1310b2e | 865 | again: |
d0164adc | 866 | if (!prealloc && gfpflags_allow_blocking(mask)) { |
059f791c DS |
867 | /* |
868 | * Don't care for allocation failure here because we might end | |
869 | * up not needing the pre-allocated extent state at all, which | |
870 | * is the case if we only have in the tree extent states that | |
871 | * cover our input range and don't cover too any other range. | |
872 | * If we end up needing a new extent state we allocate it later. | |
873 | */ | |
d1310b2e | 874 | prealloc = alloc_extent_state(mask); |
d1310b2e CM |
875 | } |
876 | ||
cad321ad | 877 | spin_lock(&tree->lock); |
9655d298 CM |
878 | if (cached_state && *cached_state) { |
879 | state = *cached_state; | |
df98b6e2 | 880 | if (state->start <= start && state->end > start && |
27a3507d | 881 | extent_state_in_tree(state)) { |
9655d298 CM |
882 | node = &state->rb_node; |
883 | goto hit_next; | |
884 | } | |
885 | } | |
d1310b2e CM |
886 | /* |
887 | * this search will find all the extents that end after | |
888 | * our range starts. | |
889 | */ | |
12cfbad9 | 890 | node = tree_search_for_insert(tree, start, &p, &parent); |
d1310b2e | 891 | if (!node) { |
8233767a XG |
892 | prealloc = alloc_extent_state_atomic(prealloc); |
893 | BUG_ON(!prealloc); | |
12cfbad9 | 894 | err = insert_state(tree, prealloc, start, end, |
d38ed27f | 895 | &p, &parent, &bits, changeset); |
c2d904e0 JM |
896 | if (err) |
897 | extent_io_tree_panic(tree, err); | |
898 | ||
c42ac0bc | 899 | cache_state(prealloc, cached_state); |
d1310b2e | 900 | prealloc = NULL; |
d1310b2e CM |
901 | goto out; |
902 | } | |
d1310b2e | 903 | state = rb_entry(node, struct extent_state, rb_node); |
40431d6c | 904 | hit_next: |
d1310b2e CM |
905 | last_start = state->start; |
906 | last_end = state->end; | |
907 | ||
908 | /* | |
909 | * | ---- desired range ---- | | |
910 | * | state | | |
911 | * | |
912 | * Just lock what we found and keep going | |
913 | */ | |
914 | if (state->start == start && state->end <= end) { | |
1edbb734 | 915 | if (state->state & exclusive_bits) { |
d1310b2e CM |
916 | *failed_start = state->start; |
917 | err = -EEXIST; | |
918 | goto out; | |
919 | } | |
42daec29 | 920 | |
d38ed27f | 921 | set_state_bits(tree, state, &bits, changeset); |
2c64c53d | 922 | cache_state(state, cached_state); |
d1310b2e | 923 | merge_state(tree, state); |
5c939df5 YZ |
924 | if (last_end == (u64)-1) |
925 | goto out; | |
926 | start = last_end + 1; | |
d1ac6e41 LB |
927 | state = next_state(state); |
928 | if (start < end && state && state->start == start && | |
929 | !need_resched()) | |
930 | goto hit_next; | |
d1310b2e CM |
931 | goto search_again; |
932 | } | |
933 | ||
934 | /* | |
935 | * | ---- desired range ---- | | |
936 | * | state | | |
937 | * or | |
938 | * | ------------- state -------------- | | |
939 | * | |
940 | * We need to split the extent we found, and may flip bits on | |
941 | * second half. | |
942 | * | |
943 | * If the extent we found extends past our | |
944 | * range, we just split and search again. It'll get split | |
945 | * again the next time though. | |
946 | * | |
947 | * If the extent we found is inside our range, we set the | |
948 | * desired bit on it. | |
949 | */ | |
950 | if (state->start < start) { | |
1edbb734 | 951 | if (state->state & exclusive_bits) { |
d1310b2e CM |
952 | *failed_start = start; |
953 | err = -EEXIST; | |
954 | goto out; | |
955 | } | |
8233767a XG |
956 | |
957 | prealloc = alloc_extent_state_atomic(prealloc); | |
958 | BUG_ON(!prealloc); | |
d1310b2e | 959 | err = split_state(tree, state, prealloc, start); |
c2d904e0 JM |
960 | if (err) |
961 | extent_io_tree_panic(tree, err); | |
962 | ||
d1310b2e CM |
963 | prealloc = NULL; |
964 | if (err) | |
965 | goto out; | |
966 | if (state->end <= end) { | |
d38ed27f | 967 | set_state_bits(tree, state, &bits, changeset); |
2c64c53d | 968 | cache_state(state, cached_state); |
d1310b2e | 969 | merge_state(tree, state); |
5c939df5 YZ |
970 | if (last_end == (u64)-1) |
971 | goto out; | |
972 | start = last_end + 1; | |
d1ac6e41 LB |
973 | state = next_state(state); |
974 | if (start < end && state && state->start == start && | |
975 | !need_resched()) | |
976 | goto hit_next; | |
d1310b2e CM |
977 | } |
978 | goto search_again; | |
979 | } | |
980 | /* | |
981 | * | ---- desired range ---- | | |
982 | * | state | or | state | | |
983 | * | |
984 | * There's a hole, we need to insert something in it and | |
985 | * ignore the extent we found. | |
986 | */ | |
987 | if (state->start > start) { | |
988 | u64 this_end; | |
989 | if (end < last_start) | |
990 | this_end = end; | |
991 | else | |
d397712b | 992 | this_end = last_start - 1; |
8233767a XG |
993 | |
994 | prealloc = alloc_extent_state_atomic(prealloc); | |
995 | BUG_ON(!prealloc); | |
c7f895a2 XG |
996 | |
997 | /* | |
998 | * Avoid to free 'prealloc' if it can be merged with | |
999 | * the later extent. | |
1000 | */ | |
d1310b2e | 1001 | err = insert_state(tree, prealloc, start, this_end, |
d38ed27f | 1002 | NULL, NULL, &bits, changeset); |
c2d904e0 JM |
1003 | if (err) |
1004 | extent_io_tree_panic(tree, err); | |
1005 | ||
9ed74f2d JB |
1006 | cache_state(prealloc, cached_state); |
1007 | prealloc = NULL; | |
d1310b2e CM |
1008 | start = this_end + 1; |
1009 | goto search_again; | |
1010 | } | |
1011 | /* | |
1012 | * | ---- desired range ---- | | |
1013 | * | state | | |
1014 | * We need to split the extent, and set the bit | |
1015 | * on the first half | |
1016 | */ | |
1017 | if (state->start <= end && state->end > end) { | |
1edbb734 | 1018 | if (state->state & exclusive_bits) { |
d1310b2e CM |
1019 | *failed_start = start; |
1020 | err = -EEXIST; | |
1021 | goto out; | |
1022 | } | |
8233767a XG |
1023 | |
1024 | prealloc = alloc_extent_state_atomic(prealloc); | |
1025 | BUG_ON(!prealloc); | |
d1310b2e | 1026 | err = split_state(tree, state, prealloc, end + 1); |
c2d904e0 JM |
1027 | if (err) |
1028 | extent_io_tree_panic(tree, err); | |
d1310b2e | 1029 | |
d38ed27f | 1030 | set_state_bits(tree, prealloc, &bits, changeset); |
2c64c53d | 1031 | cache_state(prealloc, cached_state); |
d1310b2e CM |
1032 | merge_state(tree, prealloc); |
1033 | prealloc = NULL; | |
1034 | goto out; | |
1035 | } | |
1036 | ||
b5a4ba14 DS |
1037 | search_again: |
1038 | if (start > end) | |
1039 | goto out; | |
1040 | spin_unlock(&tree->lock); | |
1041 | if (gfpflags_allow_blocking(mask)) | |
1042 | cond_resched(); | |
1043 | goto again; | |
d1310b2e CM |
1044 | |
1045 | out: | |
cad321ad | 1046 | spin_unlock(&tree->lock); |
d1310b2e CM |
1047 | if (prealloc) |
1048 | free_extent_state(prealloc); | |
1049 | ||
1050 | return err; | |
1051 | ||
d1310b2e | 1052 | } |
d1310b2e | 1053 | |
41074888 | 1054 | int set_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, |
9ee49a04 | 1055 | unsigned bits, u64 * failed_start, |
41074888 | 1056 | struct extent_state **cached_state, gfp_t mask) |
3fbe5c02 JM |
1057 | { |
1058 | return __set_extent_bit(tree, start, end, bits, 0, failed_start, | |
d38ed27f | 1059 | cached_state, mask, NULL); |
3fbe5c02 JM |
1060 | } |
1061 | ||
1062 | ||
462d6fac | 1063 | /** |
10983f2e LB |
1064 | * convert_extent_bit - convert all bits in a given range from one bit to |
1065 | * another | |
462d6fac JB |
1066 | * @tree: the io tree to search |
1067 | * @start: the start offset in bytes | |
1068 | * @end: the end offset in bytes (inclusive) | |
1069 | * @bits: the bits to set in this range | |
1070 | * @clear_bits: the bits to clear in this range | |
e6138876 | 1071 | * @cached_state: state that we're going to cache |
462d6fac JB |
1072 | * |
1073 | * This will go through and set bits for the given range. If any states exist | |
1074 | * already in this range they are set with the given bit and cleared of the | |
1075 | * clear_bits. This is only meant to be used by things that are mergeable, ie | |
1076 | * converting from say DELALLOC to DIRTY. This is not meant to be used with | |
1077 | * boundary bits like LOCK. | |
210aa277 DS |
1078 | * |
1079 | * All allocations are done with GFP_NOFS. | |
462d6fac JB |
1080 | */ |
1081 | int convert_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, | |
9ee49a04 | 1082 | unsigned bits, unsigned clear_bits, |
210aa277 | 1083 | struct extent_state **cached_state) |
462d6fac JB |
1084 | { |
1085 | struct extent_state *state; | |
1086 | struct extent_state *prealloc = NULL; | |
1087 | struct rb_node *node; | |
12cfbad9 FDBM |
1088 | struct rb_node **p; |
1089 | struct rb_node *parent; | |
462d6fac JB |
1090 | int err = 0; |
1091 | u64 last_start; | |
1092 | u64 last_end; | |
c8fd3de7 | 1093 | bool first_iteration = true; |
462d6fac | 1094 | |
a5dee37d | 1095 | btrfs_debug_check_extent_io_range(tree, start, end); |
8d599ae1 | 1096 | |
462d6fac | 1097 | again: |
210aa277 | 1098 | if (!prealloc) { |
c8fd3de7 FM |
1099 | /* |
1100 | * Best effort, don't worry if extent state allocation fails | |
1101 | * here for the first iteration. We might have a cached state | |
1102 | * that matches exactly the target range, in which case no | |
1103 | * extent state allocations are needed. We'll only know this | |
1104 | * after locking the tree. | |
1105 | */ | |
210aa277 | 1106 | prealloc = alloc_extent_state(GFP_NOFS); |
c8fd3de7 | 1107 | if (!prealloc && !first_iteration) |
462d6fac JB |
1108 | return -ENOMEM; |
1109 | } | |
1110 | ||
1111 | spin_lock(&tree->lock); | |
e6138876 JB |
1112 | if (cached_state && *cached_state) { |
1113 | state = *cached_state; | |
1114 | if (state->start <= start && state->end > start && | |
27a3507d | 1115 | extent_state_in_tree(state)) { |
e6138876 JB |
1116 | node = &state->rb_node; |
1117 | goto hit_next; | |
1118 | } | |
1119 | } | |
1120 | ||
462d6fac JB |
1121 | /* |
1122 | * this search will find all the extents that end after | |
1123 | * our range starts. | |
1124 | */ | |
12cfbad9 | 1125 | node = tree_search_for_insert(tree, start, &p, &parent); |
462d6fac JB |
1126 | if (!node) { |
1127 | prealloc = alloc_extent_state_atomic(prealloc); | |
1cf4ffdb LB |
1128 | if (!prealloc) { |
1129 | err = -ENOMEM; | |
1130 | goto out; | |
1131 | } | |
12cfbad9 | 1132 | err = insert_state(tree, prealloc, start, end, |
d38ed27f | 1133 | &p, &parent, &bits, NULL); |
c2d904e0 JM |
1134 | if (err) |
1135 | extent_io_tree_panic(tree, err); | |
c42ac0bc FDBM |
1136 | cache_state(prealloc, cached_state); |
1137 | prealloc = NULL; | |
462d6fac JB |
1138 | goto out; |
1139 | } | |
1140 | state = rb_entry(node, struct extent_state, rb_node); | |
1141 | hit_next: | |
1142 | last_start = state->start; | |
1143 | last_end = state->end; | |
1144 | ||
1145 | /* | |
1146 | * | ---- desired range ---- | | |
1147 | * | state | | |
1148 | * | |
1149 | * Just lock what we found and keep going | |
1150 | */ | |
1151 | if (state->start == start && state->end <= end) { | |
d38ed27f | 1152 | set_state_bits(tree, state, &bits, NULL); |
e6138876 | 1153 | cache_state(state, cached_state); |
fefdc557 | 1154 | state = clear_state_bit(tree, state, &clear_bits, 0, NULL); |
462d6fac JB |
1155 | if (last_end == (u64)-1) |
1156 | goto out; | |
462d6fac | 1157 | start = last_end + 1; |
d1ac6e41 LB |
1158 | if (start < end && state && state->start == start && |
1159 | !need_resched()) | |
1160 | goto hit_next; | |
462d6fac JB |
1161 | goto search_again; |
1162 | } | |
1163 | ||
1164 | /* | |
1165 | * | ---- desired range ---- | | |
1166 | * | state | | |
1167 | * or | |
1168 | * | ------------- state -------------- | | |
1169 | * | |
1170 | * We need to split the extent we found, and may flip bits on | |
1171 | * second half. | |
1172 | * | |
1173 | * If the extent we found extends past our | |
1174 | * range, we just split and search again. It'll get split | |
1175 | * again the next time though. | |
1176 | * | |
1177 | * If the extent we found is inside our range, we set the | |
1178 | * desired bit on it. | |
1179 | */ | |
1180 | if (state->start < start) { | |
1181 | prealloc = alloc_extent_state_atomic(prealloc); | |
1cf4ffdb LB |
1182 | if (!prealloc) { |
1183 | err = -ENOMEM; | |
1184 | goto out; | |
1185 | } | |
462d6fac | 1186 | err = split_state(tree, state, prealloc, start); |
c2d904e0 JM |
1187 | if (err) |
1188 | extent_io_tree_panic(tree, err); | |
462d6fac JB |
1189 | prealloc = NULL; |
1190 | if (err) | |
1191 | goto out; | |
1192 | if (state->end <= end) { | |
d38ed27f | 1193 | set_state_bits(tree, state, &bits, NULL); |
e6138876 | 1194 | cache_state(state, cached_state); |
fefdc557 QW |
1195 | state = clear_state_bit(tree, state, &clear_bits, 0, |
1196 | NULL); | |
462d6fac JB |
1197 | if (last_end == (u64)-1) |
1198 | goto out; | |
1199 | start = last_end + 1; | |
d1ac6e41 LB |
1200 | if (start < end && state && state->start == start && |
1201 | !need_resched()) | |
1202 | goto hit_next; | |
462d6fac JB |
1203 | } |
1204 | goto search_again; | |
1205 | } | |
1206 | /* | |
1207 | * | ---- desired range ---- | | |
1208 | * | state | or | state | | |
1209 | * | |
1210 | * There's a hole, we need to insert something in it and | |
1211 | * ignore the extent we found. | |
1212 | */ | |
1213 | if (state->start > start) { | |
1214 | u64 this_end; | |
1215 | if (end < last_start) | |
1216 | this_end = end; | |
1217 | else | |
1218 | this_end = last_start - 1; | |
1219 | ||
1220 | prealloc = alloc_extent_state_atomic(prealloc); | |
1cf4ffdb LB |
1221 | if (!prealloc) { |
1222 | err = -ENOMEM; | |
1223 | goto out; | |
1224 | } | |
462d6fac JB |
1225 | |
1226 | /* | |
1227 | * Avoid to free 'prealloc' if it can be merged with | |
1228 | * the later extent. | |
1229 | */ | |
1230 | err = insert_state(tree, prealloc, start, this_end, | |
d38ed27f | 1231 | NULL, NULL, &bits, NULL); |
c2d904e0 JM |
1232 | if (err) |
1233 | extent_io_tree_panic(tree, err); | |
e6138876 | 1234 | cache_state(prealloc, cached_state); |
462d6fac JB |
1235 | prealloc = NULL; |
1236 | start = this_end + 1; | |
1237 | goto search_again; | |
1238 | } | |
1239 | /* | |
1240 | * | ---- desired range ---- | | |
1241 | * | state | | |
1242 | * We need to split the extent, and set the bit | |
1243 | * on the first half | |
1244 | */ | |
1245 | if (state->start <= end && state->end > end) { | |
1246 | prealloc = alloc_extent_state_atomic(prealloc); | |
1cf4ffdb LB |
1247 | if (!prealloc) { |
1248 | err = -ENOMEM; | |
1249 | goto out; | |
1250 | } | |
462d6fac JB |
1251 | |
1252 | err = split_state(tree, state, prealloc, end + 1); | |
c2d904e0 JM |
1253 | if (err) |
1254 | extent_io_tree_panic(tree, err); | |
462d6fac | 1255 | |
d38ed27f | 1256 | set_state_bits(tree, prealloc, &bits, NULL); |
e6138876 | 1257 | cache_state(prealloc, cached_state); |
fefdc557 | 1258 | clear_state_bit(tree, prealloc, &clear_bits, 0, NULL); |
462d6fac JB |
1259 | prealloc = NULL; |
1260 | goto out; | |
1261 | } | |
1262 | ||
462d6fac JB |
1263 | search_again: |
1264 | if (start > end) | |
1265 | goto out; | |
1266 | spin_unlock(&tree->lock); | |
210aa277 | 1267 | cond_resched(); |
c8fd3de7 | 1268 | first_iteration = false; |
462d6fac | 1269 | goto again; |
462d6fac JB |
1270 | |
1271 | out: | |
1272 | spin_unlock(&tree->lock); | |
1273 | if (prealloc) | |
1274 | free_extent_state(prealloc); | |
1275 | ||
1276 | return err; | |
462d6fac JB |
1277 | } |
1278 | ||
d1310b2e | 1279 | /* wrappers around set/clear extent bit */ |
d38ed27f | 1280 | int set_record_extent_bits(struct extent_io_tree *tree, u64 start, u64 end, |
2c53b912 | 1281 | unsigned bits, struct extent_changeset *changeset) |
d38ed27f QW |
1282 | { |
1283 | /* | |
1284 | * We don't support EXTENT_LOCKED yet, as current changeset will | |
1285 | * record any bits changed, so for EXTENT_LOCKED case, it will | |
1286 | * either fail with -EEXIST or changeset will record the whole | |
1287 | * range. | |
1288 | */ | |
1289 | BUG_ON(bits & EXTENT_LOCKED); | |
1290 | ||
2c53b912 | 1291 | return __set_extent_bit(tree, start, end, bits, 0, NULL, NULL, GFP_NOFS, |
d38ed27f QW |
1292 | changeset); |
1293 | } | |
1294 | ||
fefdc557 QW |
1295 | int clear_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, |
1296 | unsigned bits, int wake, int delete, | |
ae0f1625 | 1297 | struct extent_state **cached) |
fefdc557 QW |
1298 | { |
1299 | return __clear_extent_bit(tree, start, end, bits, wake, delete, | |
ae0f1625 | 1300 | cached, GFP_NOFS, NULL); |
fefdc557 QW |
1301 | } |
1302 | ||
fefdc557 | 1303 | int clear_record_extent_bits(struct extent_io_tree *tree, u64 start, u64 end, |
f734c44a | 1304 | unsigned bits, struct extent_changeset *changeset) |
fefdc557 QW |
1305 | { |
1306 | /* | |
1307 | * Don't support EXTENT_LOCKED case, same reason as | |
1308 | * set_record_extent_bits(). | |
1309 | */ | |
1310 | BUG_ON(bits & EXTENT_LOCKED); | |
1311 | ||
f734c44a | 1312 | return __clear_extent_bit(tree, start, end, bits, 0, 0, NULL, GFP_NOFS, |
fefdc557 QW |
1313 | changeset); |
1314 | } | |
1315 | ||
d352ac68 CM |
1316 | /* |
1317 | * either insert or lock state struct between start and end use mask to tell | |
1318 | * us if waiting is desired. | |
1319 | */ | |
1edbb734 | 1320 | int lock_extent_bits(struct extent_io_tree *tree, u64 start, u64 end, |
ff13db41 | 1321 | struct extent_state **cached_state) |
d1310b2e CM |
1322 | { |
1323 | int err; | |
1324 | u64 failed_start; | |
9ee49a04 | 1325 | |
d1310b2e | 1326 | while (1) { |
ff13db41 | 1327 | err = __set_extent_bit(tree, start, end, EXTENT_LOCKED, |
3fbe5c02 | 1328 | EXTENT_LOCKED, &failed_start, |
d38ed27f | 1329 | cached_state, GFP_NOFS, NULL); |
d0082371 | 1330 | if (err == -EEXIST) { |
d1310b2e CM |
1331 | wait_extent_bit(tree, failed_start, end, EXTENT_LOCKED); |
1332 | start = failed_start; | |
d0082371 | 1333 | } else |
d1310b2e | 1334 | break; |
d1310b2e CM |
1335 | WARN_ON(start > end); |
1336 | } | |
1337 | return err; | |
1338 | } | |
d1310b2e | 1339 | |
d0082371 | 1340 | int try_lock_extent(struct extent_io_tree *tree, u64 start, u64 end) |
25179201 JB |
1341 | { |
1342 | int err; | |
1343 | u64 failed_start; | |
1344 | ||
3fbe5c02 | 1345 | err = __set_extent_bit(tree, start, end, EXTENT_LOCKED, EXTENT_LOCKED, |
d38ed27f | 1346 | &failed_start, NULL, GFP_NOFS, NULL); |
6643558d YZ |
1347 | if (err == -EEXIST) { |
1348 | if (failed_start > start) | |
1349 | clear_extent_bit(tree, start, failed_start - 1, | |
ae0f1625 | 1350 | EXTENT_LOCKED, 1, 0, NULL); |
25179201 | 1351 | return 0; |
6643558d | 1352 | } |
25179201 JB |
1353 | return 1; |
1354 | } | |
25179201 | 1355 | |
bd1fa4f0 | 1356 | void extent_range_clear_dirty_for_io(struct inode *inode, u64 start, u64 end) |
4adaa611 | 1357 | { |
09cbfeaf KS |
1358 | unsigned long index = start >> PAGE_SHIFT; |
1359 | unsigned long end_index = end >> PAGE_SHIFT; | |
4adaa611 CM |
1360 | struct page *page; |
1361 | ||
1362 | while (index <= end_index) { | |
1363 | page = find_get_page(inode->i_mapping, index); | |
1364 | BUG_ON(!page); /* Pages should be in the extent_io_tree */ | |
1365 | clear_page_dirty_for_io(page); | |
09cbfeaf | 1366 | put_page(page); |
4adaa611 CM |
1367 | index++; |
1368 | } | |
4adaa611 CM |
1369 | } |
1370 | ||
f6311572 | 1371 | void extent_range_redirty_for_io(struct inode *inode, u64 start, u64 end) |
4adaa611 | 1372 | { |
09cbfeaf KS |
1373 | unsigned long index = start >> PAGE_SHIFT; |
1374 | unsigned long end_index = end >> PAGE_SHIFT; | |
4adaa611 CM |
1375 | struct page *page; |
1376 | ||
1377 | while (index <= end_index) { | |
1378 | page = find_get_page(inode->i_mapping, index); | |
1379 | BUG_ON(!page); /* Pages should be in the extent_io_tree */ | |
4adaa611 | 1380 | __set_page_dirty_nobuffers(page); |
8d38633c | 1381 | account_page_redirty(page); |
09cbfeaf | 1382 | put_page(page); |
4adaa611 CM |
1383 | index++; |
1384 | } | |
4adaa611 CM |
1385 | } |
1386 | ||
d1310b2e CM |
1387 | /* |
1388 | * helper function to set both pages and extents in the tree writeback | |
1389 | */ | |
35de6db2 | 1390 | static void set_range_writeback(struct extent_io_tree *tree, u64 start, u64 end) |
d1310b2e | 1391 | { |
c6100a4b | 1392 | tree->ops->set_range_writeback(tree->private_data, start, end); |
d1310b2e | 1393 | } |
d1310b2e | 1394 | |
d352ac68 CM |
1395 | /* find the first state struct with 'bits' set after 'start', and |
1396 | * return it. tree->lock must be held. NULL will returned if | |
1397 | * nothing was found after 'start' | |
1398 | */ | |
48a3b636 ES |
1399 | static struct extent_state * |
1400 | find_first_extent_bit_state(struct extent_io_tree *tree, | |
9ee49a04 | 1401 | u64 start, unsigned bits) |
d7fc640e CM |
1402 | { |
1403 | struct rb_node *node; | |
1404 | struct extent_state *state; | |
1405 | ||
1406 | /* | |
1407 | * this search will find all the extents that end after | |
1408 | * our range starts. | |
1409 | */ | |
1410 | node = tree_search(tree, start); | |
d397712b | 1411 | if (!node) |
d7fc640e | 1412 | goto out; |
d7fc640e | 1413 | |
d397712b | 1414 | while (1) { |
d7fc640e | 1415 | state = rb_entry(node, struct extent_state, rb_node); |
d397712b | 1416 | if (state->end >= start && (state->state & bits)) |
d7fc640e | 1417 | return state; |
d397712b | 1418 | |
d7fc640e CM |
1419 | node = rb_next(node); |
1420 | if (!node) | |
1421 | break; | |
1422 | } | |
1423 | out: | |
1424 | return NULL; | |
1425 | } | |
d7fc640e | 1426 | |
69261c4b XG |
1427 | /* |
1428 | * find the first offset in the io tree with 'bits' set. zero is | |
1429 | * returned if we find something, and *start_ret and *end_ret are | |
1430 | * set to reflect the state struct that was found. | |
1431 | * | |
477d7eaf | 1432 | * If nothing was found, 1 is returned. If found something, return 0. |
69261c4b XG |
1433 | */ |
1434 | int find_first_extent_bit(struct extent_io_tree *tree, u64 start, | |
9ee49a04 | 1435 | u64 *start_ret, u64 *end_ret, unsigned bits, |
e6138876 | 1436 | struct extent_state **cached_state) |
69261c4b XG |
1437 | { |
1438 | struct extent_state *state; | |
e6138876 | 1439 | struct rb_node *n; |
69261c4b XG |
1440 | int ret = 1; |
1441 | ||
1442 | spin_lock(&tree->lock); | |
e6138876 JB |
1443 | if (cached_state && *cached_state) { |
1444 | state = *cached_state; | |
27a3507d | 1445 | if (state->end == start - 1 && extent_state_in_tree(state)) { |
e6138876 JB |
1446 | n = rb_next(&state->rb_node); |
1447 | while (n) { | |
1448 | state = rb_entry(n, struct extent_state, | |
1449 | rb_node); | |
1450 | if (state->state & bits) | |
1451 | goto got_it; | |
1452 | n = rb_next(n); | |
1453 | } | |
1454 | free_extent_state(*cached_state); | |
1455 | *cached_state = NULL; | |
1456 | goto out; | |
1457 | } | |
1458 | free_extent_state(*cached_state); | |
1459 | *cached_state = NULL; | |
1460 | } | |
1461 | ||
69261c4b | 1462 | state = find_first_extent_bit_state(tree, start, bits); |
e6138876 | 1463 | got_it: |
69261c4b | 1464 | if (state) { |
e38e2ed7 | 1465 | cache_state_if_flags(state, cached_state, 0); |
69261c4b XG |
1466 | *start_ret = state->start; |
1467 | *end_ret = state->end; | |
1468 | ret = 0; | |
1469 | } | |
e6138876 | 1470 | out: |
69261c4b XG |
1471 | spin_unlock(&tree->lock); |
1472 | return ret; | |
1473 | } | |
1474 | ||
d352ac68 CM |
1475 | /* |
1476 | * find a contiguous range of bytes in the file marked as delalloc, not | |
1477 | * more than 'max_bytes'. start and end are used to return the range, | |
1478 | * | |
1479 | * 1 is returned if we find something, 0 if nothing was in the tree | |
1480 | */ | |
c8b97818 | 1481 | static noinline u64 find_delalloc_range(struct extent_io_tree *tree, |
c2a128d2 JB |
1482 | u64 *start, u64 *end, u64 max_bytes, |
1483 | struct extent_state **cached_state) | |
d1310b2e CM |
1484 | { |
1485 | struct rb_node *node; | |
1486 | struct extent_state *state; | |
1487 | u64 cur_start = *start; | |
1488 | u64 found = 0; | |
1489 | u64 total_bytes = 0; | |
1490 | ||
cad321ad | 1491 | spin_lock(&tree->lock); |
c8b97818 | 1492 | |
d1310b2e CM |
1493 | /* |
1494 | * this search will find all the extents that end after | |
1495 | * our range starts. | |
1496 | */ | |
80ea96b1 | 1497 | node = tree_search(tree, cur_start); |
2b114d1d | 1498 | if (!node) { |
3b951516 CM |
1499 | if (!found) |
1500 | *end = (u64)-1; | |
d1310b2e CM |
1501 | goto out; |
1502 | } | |
1503 | ||
d397712b | 1504 | while (1) { |
d1310b2e | 1505 | state = rb_entry(node, struct extent_state, rb_node); |
5b21f2ed ZY |
1506 | if (found && (state->start != cur_start || |
1507 | (state->state & EXTENT_BOUNDARY))) { | |
d1310b2e CM |
1508 | goto out; |
1509 | } | |
1510 | if (!(state->state & EXTENT_DELALLOC)) { | |
1511 | if (!found) | |
1512 | *end = state->end; | |
1513 | goto out; | |
1514 | } | |
c2a128d2 | 1515 | if (!found) { |
d1310b2e | 1516 | *start = state->start; |
c2a128d2 | 1517 | *cached_state = state; |
b7ac31b7 | 1518 | refcount_inc(&state->refs); |
c2a128d2 | 1519 | } |
d1310b2e CM |
1520 | found++; |
1521 | *end = state->end; | |
1522 | cur_start = state->end + 1; | |
1523 | node = rb_next(node); | |
d1310b2e | 1524 | total_bytes += state->end - state->start + 1; |
7bf811a5 | 1525 | if (total_bytes >= max_bytes) |
573aecaf | 1526 | break; |
573aecaf | 1527 | if (!node) |
d1310b2e CM |
1528 | break; |
1529 | } | |
1530 | out: | |
cad321ad | 1531 | spin_unlock(&tree->lock); |
d1310b2e CM |
1532 | return found; |
1533 | } | |
1534 | ||
da2c7009 LB |
1535 | static int __process_pages_contig(struct address_space *mapping, |
1536 | struct page *locked_page, | |
1537 | pgoff_t start_index, pgoff_t end_index, | |
1538 | unsigned long page_ops, pgoff_t *index_ret); | |
1539 | ||
143bede5 JM |
1540 | static noinline void __unlock_for_delalloc(struct inode *inode, |
1541 | struct page *locked_page, | |
1542 | u64 start, u64 end) | |
c8b97818 | 1543 | { |
09cbfeaf KS |
1544 | unsigned long index = start >> PAGE_SHIFT; |
1545 | unsigned long end_index = end >> PAGE_SHIFT; | |
c8b97818 | 1546 | |
76c0021d | 1547 | ASSERT(locked_page); |
c8b97818 | 1548 | if (index == locked_page->index && end_index == index) |
143bede5 | 1549 | return; |
c8b97818 | 1550 | |
76c0021d LB |
1551 | __process_pages_contig(inode->i_mapping, locked_page, index, end_index, |
1552 | PAGE_UNLOCK, NULL); | |
c8b97818 CM |
1553 | } |
1554 | ||
1555 | static noinline int lock_delalloc_pages(struct inode *inode, | |
1556 | struct page *locked_page, | |
1557 | u64 delalloc_start, | |
1558 | u64 delalloc_end) | |
1559 | { | |
09cbfeaf | 1560 | unsigned long index = delalloc_start >> PAGE_SHIFT; |
76c0021d | 1561 | unsigned long index_ret = index; |
09cbfeaf | 1562 | unsigned long end_index = delalloc_end >> PAGE_SHIFT; |
c8b97818 | 1563 | int ret; |
c8b97818 | 1564 | |
76c0021d | 1565 | ASSERT(locked_page); |
c8b97818 CM |
1566 | if (index == locked_page->index && index == end_index) |
1567 | return 0; | |
1568 | ||
76c0021d LB |
1569 | ret = __process_pages_contig(inode->i_mapping, locked_page, index, |
1570 | end_index, PAGE_LOCK, &index_ret); | |
1571 | if (ret == -EAGAIN) | |
1572 | __unlock_for_delalloc(inode, locked_page, delalloc_start, | |
1573 | (u64)index_ret << PAGE_SHIFT); | |
c8b97818 CM |
1574 | return ret; |
1575 | } | |
1576 | ||
1577 | /* | |
1578 | * find a contiguous range of bytes in the file marked as delalloc, not | |
1579 | * more than 'max_bytes'. start and end are used to return the range, | |
1580 | * | |
1581 | * 1 is returned if we find something, 0 if nothing was in the tree | |
1582 | */ | |
294e30fe JB |
1583 | STATIC u64 find_lock_delalloc_range(struct inode *inode, |
1584 | struct extent_io_tree *tree, | |
1585 | struct page *locked_page, u64 *start, | |
1586 | u64 *end, u64 max_bytes) | |
c8b97818 CM |
1587 | { |
1588 | u64 delalloc_start; | |
1589 | u64 delalloc_end; | |
1590 | u64 found; | |
9655d298 | 1591 | struct extent_state *cached_state = NULL; |
c8b97818 CM |
1592 | int ret; |
1593 | int loops = 0; | |
1594 | ||
1595 | again: | |
1596 | /* step one, find a bunch of delalloc bytes starting at start */ | |
1597 | delalloc_start = *start; | |
1598 | delalloc_end = 0; | |
1599 | found = find_delalloc_range(tree, &delalloc_start, &delalloc_end, | |
c2a128d2 | 1600 | max_bytes, &cached_state); |
70b99e69 | 1601 | if (!found || delalloc_end <= *start) { |
c8b97818 CM |
1602 | *start = delalloc_start; |
1603 | *end = delalloc_end; | |
c2a128d2 | 1604 | free_extent_state(cached_state); |
385fe0be | 1605 | return 0; |
c8b97818 CM |
1606 | } |
1607 | ||
70b99e69 CM |
1608 | /* |
1609 | * start comes from the offset of locked_page. We have to lock | |
1610 | * pages in order, so we can't process delalloc bytes before | |
1611 | * locked_page | |
1612 | */ | |
d397712b | 1613 | if (delalloc_start < *start) |
70b99e69 | 1614 | delalloc_start = *start; |
70b99e69 | 1615 | |
c8b97818 CM |
1616 | /* |
1617 | * make sure to limit the number of pages we try to lock down | |
c8b97818 | 1618 | */ |
7bf811a5 JB |
1619 | if (delalloc_end + 1 - delalloc_start > max_bytes) |
1620 | delalloc_end = delalloc_start + max_bytes - 1; | |
d397712b | 1621 | |
c8b97818 CM |
1622 | /* step two, lock all the pages after the page that has start */ |
1623 | ret = lock_delalloc_pages(inode, locked_page, | |
1624 | delalloc_start, delalloc_end); | |
1625 | if (ret == -EAGAIN) { | |
1626 | /* some of the pages are gone, lets avoid looping by | |
1627 | * shortening the size of the delalloc range we're searching | |
1628 | */ | |
9655d298 | 1629 | free_extent_state(cached_state); |
7d788742 | 1630 | cached_state = NULL; |
c8b97818 | 1631 | if (!loops) { |
09cbfeaf | 1632 | max_bytes = PAGE_SIZE; |
c8b97818 CM |
1633 | loops = 1; |
1634 | goto again; | |
1635 | } else { | |
1636 | found = 0; | |
1637 | goto out_failed; | |
1638 | } | |
1639 | } | |
79787eaa | 1640 | BUG_ON(ret); /* Only valid values are 0 and -EAGAIN */ |
c8b97818 CM |
1641 | |
1642 | /* step three, lock the state bits for the whole range */ | |
ff13db41 | 1643 | lock_extent_bits(tree, delalloc_start, delalloc_end, &cached_state); |
c8b97818 CM |
1644 | |
1645 | /* then test to make sure it is all still delalloc */ | |
1646 | ret = test_range_bit(tree, delalloc_start, delalloc_end, | |
9655d298 | 1647 | EXTENT_DELALLOC, 1, cached_state); |
c8b97818 | 1648 | if (!ret) { |
9655d298 CM |
1649 | unlock_extent_cached(tree, delalloc_start, delalloc_end, |
1650 | &cached_state, GFP_NOFS); | |
c8b97818 CM |
1651 | __unlock_for_delalloc(inode, locked_page, |
1652 | delalloc_start, delalloc_end); | |
1653 | cond_resched(); | |
1654 | goto again; | |
1655 | } | |
9655d298 | 1656 | free_extent_state(cached_state); |
c8b97818 CM |
1657 | *start = delalloc_start; |
1658 | *end = delalloc_end; | |
1659 | out_failed: | |
1660 | return found; | |
1661 | } | |
1662 | ||
da2c7009 LB |
1663 | static int __process_pages_contig(struct address_space *mapping, |
1664 | struct page *locked_page, | |
1665 | pgoff_t start_index, pgoff_t end_index, | |
1666 | unsigned long page_ops, pgoff_t *index_ret) | |
c8b97818 | 1667 | { |
873695b3 | 1668 | unsigned long nr_pages = end_index - start_index + 1; |
da2c7009 | 1669 | unsigned long pages_locked = 0; |
873695b3 | 1670 | pgoff_t index = start_index; |
c8b97818 | 1671 | struct page *pages[16]; |
873695b3 | 1672 | unsigned ret; |
da2c7009 | 1673 | int err = 0; |
c8b97818 | 1674 | int i; |
771ed689 | 1675 | |
da2c7009 LB |
1676 | if (page_ops & PAGE_LOCK) { |
1677 | ASSERT(page_ops == PAGE_LOCK); | |
1678 | ASSERT(index_ret && *index_ret == start_index); | |
1679 | } | |
1680 | ||
704de49d | 1681 | if ((page_ops & PAGE_SET_ERROR) && nr_pages > 0) |
873695b3 | 1682 | mapping_set_error(mapping, -EIO); |
704de49d | 1683 | |
d397712b | 1684 | while (nr_pages > 0) { |
873695b3 | 1685 | ret = find_get_pages_contig(mapping, index, |
5b050f04 CM |
1686 | min_t(unsigned long, |
1687 | nr_pages, ARRAY_SIZE(pages)), pages); | |
da2c7009 LB |
1688 | if (ret == 0) { |
1689 | /* | |
1690 | * Only if we're going to lock these pages, | |
1691 | * can we find nothing at @index. | |
1692 | */ | |
1693 | ASSERT(page_ops & PAGE_LOCK); | |
49d4a334 LB |
1694 | err = -EAGAIN; |
1695 | goto out; | |
da2c7009 | 1696 | } |
8b62b72b | 1697 | |
da2c7009 | 1698 | for (i = 0; i < ret; i++) { |
c2790a2e | 1699 | if (page_ops & PAGE_SET_PRIVATE2) |
8b62b72b CM |
1700 | SetPagePrivate2(pages[i]); |
1701 | ||
c8b97818 | 1702 | if (pages[i] == locked_page) { |
09cbfeaf | 1703 | put_page(pages[i]); |
da2c7009 | 1704 | pages_locked++; |
c8b97818 CM |
1705 | continue; |
1706 | } | |
c2790a2e | 1707 | if (page_ops & PAGE_CLEAR_DIRTY) |
c8b97818 | 1708 | clear_page_dirty_for_io(pages[i]); |
c2790a2e | 1709 | if (page_ops & PAGE_SET_WRITEBACK) |
c8b97818 | 1710 | set_page_writeback(pages[i]); |
704de49d FM |
1711 | if (page_ops & PAGE_SET_ERROR) |
1712 | SetPageError(pages[i]); | |
c2790a2e | 1713 | if (page_ops & PAGE_END_WRITEBACK) |
c8b97818 | 1714 | end_page_writeback(pages[i]); |
c2790a2e | 1715 | if (page_ops & PAGE_UNLOCK) |
771ed689 | 1716 | unlock_page(pages[i]); |
da2c7009 LB |
1717 | if (page_ops & PAGE_LOCK) { |
1718 | lock_page(pages[i]); | |
1719 | if (!PageDirty(pages[i]) || | |
1720 | pages[i]->mapping != mapping) { | |
1721 | unlock_page(pages[i]); | |
1722 | put_page(pages[i]); | |
1723 | err = -EAGAIN; | |
1724 | goto out; | |
1725 | } | |
1726 | } | |
09cbfeaf | 1727 | put_page(pages[i]); |
da2c7009 | 1728 | pages_locked++; |
c8b97818 CM |
1729 | } |
1730 | nr_pages -= ret; | |
1731 | index += ret; | |
1732 | cond_resched(); | |
1733 | } | |
da2c7009 LB |
1734 | out: |
1735 | if (err && index_ret) | |
1736 | *index_ret = start_index + pages_locked - 1; | |
1737 | return err; | |
c8b97818 | 1738 | } |
c8b97818 | 1739 | |
873695b3 LB |
1740 | void extent_clear_unlock_delalloc(struct inode *inode, u64 start, u64 end, |
1741 | u64 delalloc_end, struct page *locked_page, | |
1742 | unsigned clear_bits, | |
1743 | unsigned long page_ops) | |
1744 | { | |
1745 | clear_extent_bit(&BTRFS_I(inode)->io_tree, start, end, clear_bits, 1, 0, | |
ae0f1625 | 1746 | NULL); |
873695b3 LB |
1747 | |
1748 | __process_pages_contig(inode->i_mapping, locked_page, | |
1749 | start >> PAGE_SHIFT, end >> PAGE_SHIFT, | |
da2c7009 | 1750 | page_ops, NULL); |
873695b3 LB |
1751 | } |
1752 | ||
d352ac68 CM |
1753 | /* |
1754 | * count the number of bytes in the tree that have a given bit(s) | |
1755 | * set. This can be fairly slow, except for EXTENT_DIRTY which is | |
1756 | * cached. The total number found is returned. | |
1757 | */ | |
d1310b2e CM |
1758 | u64 count_range_bits(struct extent_io_tree *tree, |
1759 | u64 *start, u64 search_end, u64 max_bytes, | |
9ee49a04 | 1760 | unsigned bits, int contig) |
d1310b2e CM |
1761 | { |
1762 | struct rb_node *node; | |
1763 | struct extent_state *state; | |
1764 | u64 cur_start = *start; | |
1765 | u64 total_bytes = 0; | |
ec29ed5b | 1766 | u64 last = 0; |
d1310b2e CM |
1767 | int found = 0; |
1768 | ||
fae7f21c | 1769 | if (WARN_ON(search_end <= cur_start)) |
d1310b2e | 1770 | return 0; |
d1310b2e | 1771 | |
cad321ad | 1772 | spin_lock(&tree->lock); |
d1310b2e CM |
1773 | if (cur_start == 0 && bits == EXTENT_DIRTY) { |
1774 | total_bytes = tree->dirty_bytes; | |
1775 | goto out; | |
1776 | } | |
1777 | /* | |
1778 | * this search will find all the extents that end after | |
1779 | * our range starts. | |
1780 | */ | |
80ea96b1 | 1781 | node = tree_search(tree, cur_start); |
d397712b | 1782 | if (!node) |
d1310b2e | 1783 | goto out; |
d1310b2e | 1784 | |
d397712b | 1785 | while (1) { |
d1310b2e CM |
1786 | state = rb_entry(node, struct extent_state, rb_node); |
1787 | if (state->start > search_end) | |
1788 | break; | |
ec29ed5b CM |
1789 | if (contig && found && state->start > last + 1) |
1790 | break; | |
1791 | if (state->end >= cur_start && (state->state & bits) == bits) { | |
d1310b2e CM |
1792 | total_bytes += min(search_end, state->end) + 1 - |
1793 | max(cur_start, state->start); | |
1794 | if (total_bytes >= max_bytes) | |
1795 | break; | |
1796 | if (!found) { | |
af60bed2 | 1797 | *start = max(cur_start, state->start); |
d1310b2e CM |
1798 | found = 1; |
1799 | } | |
ec29ed5b CM |
1800 | last = state->end; |
1801 | } else if (contig && found) { | |
1802 | break; | |
d1310b2e CM |
1803 | } |
1804 | node = rb_next(node); | |
1805 | if (!node) | |
1806 | break; | |
1807 | } | |
1808 | out: | |
cad321ad | 1809 | spin_unlock(&tree->lock); |
d1310b2e CM |
1810 | return total_bytes; |
1811 | } | |
b2950863 | 1812 | |
d352ac68 CM |
1813 | /* |
1814 | * set the private field for a given byte offset in the tree. If there isn't | |
1815 | * an extent_state there already, this does nothing. | |
1816 | */ | |
f827ba9a | 1817 | static noinline int set_state_failrec(struct extent_io_tree *tree, u64 start, |
47dc196a | 1818 | struct io_failure_record *failrec) |
d1310b2e CM |
1819 | { |
1820 | struct rb_node *node; | |
1821 | struct extent_state *state; | |
1822 | int ret = 0; | |
1823 | ||
cad321ad | 1824 | spin_lock(&tree->lock); |
d1310b2e CM |
1825 | /* |
1826 | * this search will find all the extents that end after | |
1827 | * our range starts. | |
1828 | */ | |
80ea96b1 | 1829 | node = tree_search(tree, start); |
2b114d1d | 1830 | if (!node) { |
d1310b2e CM |
1831 | ret = -ENOENT; |
1832 | goto out; | |
1833 | } | |
1834 | state = rb_entry(node, struct extent_state, rb_node); | |
1835 | if (state->start != start) { | |
1836 | ret = -ENOENT; | |
1837 | goto out; | |
1838 | } | |
47dc196a | 1839 | state->failrec = failrec; |
d1310b2e | 1840 | out: |
cad321ad | 1841 | spin_unlock(&tree->lock); |
d1310b2e CM |
1842 | return ret; |
1843 | } | |
1844 | ||
f827ba9a | 1845 | static noinline int get_state_failrec(struct extent_io_tree *tree, u64 start, |
47dc196a | 1846 | struct io_failure_record **failrec) |
d1310b2e CM |
1847 | { |
1848 | struct rb_node *node; | |
1849 | struct extent_state *state; | |
1850 | int ret = 0; | |
1851 | ||
cad321ad | 1852 | spin_lock(&tree->lock); |
d1310b2e CM |
1853 | /* |
1854 | * this search will find all the extents that end after | |
1855 | * our range starts. | |
1856 | */ | |
80ea96b1 | 1857 | node = tree_search(tree, start); |
2b114d1d | 1858 | if (!node) { |
d1310b2e CM |
1859 | ret = -ENOENT; |
1860 | goto out; | |
1861 | } | |
1862 | state = rb_entry(node, struct extent_state, rb_node); | |
1863 | if (state->start != start) { | |
1864 | ret = -ENOENT; | |
1865 | goto out; | |
1866 | } | |
47dc196a | 1867 | *failrec = state->failrec; |
d1310b2e | 1868 | out: |
cad321ad | 1869 | spin_unlock(&tree->lock); |
d1310b2e CM |
1870 | return ret; |
1871 | } | |
1872 | ||
1873 | /* | |
1874 | * searches a range in the state tree for a given mask. | |
70dec807 | 1875 | * If 'filled' == 1, this returns 1 only if every extent in the tree |
d1310b2e CM |
1876 | * has the bits set. Otherwise, 1 is returned if any bit in the |
1877 | * range is found set. | |
1878 | */ | |
1879 | int test_range_bit(struct extent_io_tree *tree, u64 start, u64 end, | |
9ee49a04 | 1880 | unsigned bits, int filled, struct extent_state *cached) |
d1310b2e CM |
1881 | { |
1882 | struct extent_state *state = NULL; | |
1883 | struct rb_node *node; | |
1884 | int bitset = 0; | |
d1310b2e | 1885 | |
cad321ad | 1886 | spin_lock(&tree->lock); |
27a3507d | 1887 | if (cached && extent_state_in_tree(cached) && cached->start <= start && |
df98b6e2 | 1888 | cached->end > start) |
9655d298 CM |
1889 | node = &cached->rb_node; |
1890 | else | |
1891 | node = tree_search(tree, start); | |
d1310b2e CM |
1892 | while (node && start <= end) { |
1893 | state = rb_entry(node, struct extent_state, rb_node); | |
1894 | ||
1895 | if (filled && state->start > start) { | |
1896 | bitset = 0; | |
1897 | break; | |
1898 | } | |
1899 | ||
1900 | if (state->start > end) | |
1901 | break; | |
1902 | ||
1903 | if (state->state & bits) { | |
1904 | bitset = 1; | |
1905 | if (!filled) | |
1906 | break; | |
1907 | } else if (filled) { | |
1908 | bitset = 0; | |
1909 | break; | |
1910 | } | |
46562cec CM |
1911 | |
1912 | if (state->end == (u64)-1) | |
1913 | break; | |
1914 | ||
d1310b2e CM |
1915 | start = state->end + 1; |
1916 | if (start > end) | |
1917 | break; | |
1918 | node = rb_next(node); | |
1919 | if (!node) { | |
1920 | if (filled) | |
1921 | bitset = 0; | |
1922 | break; | |
1923 | } | |
1924 | } | |
cad321ad | 1925 | spin_unlock(&tree->lock); |
d1310b2e CM |
1926 | return bitset; |
1927 | } | |
d1310b2e CM |
1928 | |
1929 | /* | |
1930 | * helper function to set a given page up to date if all the | |
1931 | * extents in the tree for that page are up to date | |
1932 | */ | |
143bede5 | 1933 | static void check_page_uptodate(struct extent_io_tree *tree, struct page *page) |
d1310b2e | 1934 | { |
4eee4fa4 | 1935 | u64 start = page_offset(page); |
09cbfeaf | 1936 | u64 end = start + PAGE_SIZE - 1; |
9655d298 | 1937 | if (test_range_bit(tree, start, end, EXTENT_UPTODATE, 1, NULL)) |
d1310b2e | 1938 | SetPageUptodate(page); |
d1310b2e CM |
1939 | } |
1940 | ||
7870d082 JB |
1941 | int free_io_failure(struct extent_io_tree *failure_tree, |
1942 | struct extent_io_tree *io_tree, | |
1943 | struct io_failure_record *rec) | |
4a54c8c1 JS |
1944 | { |
1945 | int ret; | |
1946 | int err = 0; | |
4a54c8c1 | 1947 | |
47dc196a | 1948 | set_state_failrec(failure_tree, rec->start, NULL); |
4a54c8c1 JS |
1949 | ret = clear_extent_bits(failure_tree, rec->start, |
1950 | rec->start + rec->len - 1, | |
91166212 | 1951 | EXTENT_LOCKED | EXTENT_DIRTY); |
4a54c8c1 JS |
1952 | if (ret) |
1953 | err = ret; | |
1954 | ||
7870d082 | 1955 | ret = clear_extent_bits(io_tree, rec->start, |
53b381b3 | 1956 | rec->start + rec->len - 1, |
91166212 | 1957 | EXTENT_DAMAGED); |
53b381b3 DW |
1958 | if (ret && !err) |
1959 | err = ret; | |
4a54c8c1 JS |
1960 | |
1961 | kfree(rec); | |
1962 | return err; | |
1963 | } | |
1964 | ||
4a54c8c1 JS |
1965 | /* |
1966 | * this bypasses the standard btrfs submit functions deliberately, as | |
1967 | * the standard behavior is to write all copies in a raid setup. here we only | |
1968 | * want to write the one bad copy. so we do the mapping for ourselves and issue | |
1969 | * submit_bio directly. | |
3ec706c8 | 1970 | * to avoid any synchronization issues, wait for the data after writing, which |
4a54c8c1 JS |
1971 | * actually prevents the read that triggered the error from finishing. |
1972 | * currently, there can be no more than two copies of every data bit. thus, | |
1973 | * exactly one rewrite is required. | |
1974 | */ | |
6ec656bc JB |
1975 | int repair_io_failure(struct btrfs_fs_info *fs_info, u64 ino, u64 start, |
1976 | u64 length, u64 logical, struct page *page, | |
1977 | unsigned int pg_offset, int mirror_num) | |
4a54c8c1 JS |
1978 | { |
1979 | struct bio *bio; | |
1980 | struct btrfs_device *dev; | |
4a54c8c1 JS |
1981 | u64 map_length = 0; |
1982 | u64 sector; | |
1983 | struct btrfs_bio *bbio = NULL; | |
1984 | int ret; | |
1985 | ||
1751e8a6 | 1986 | ASSERT(!(fs_info->sb->s_flags & SB_RDONLY)); |
4a54c8c1 JS |
1987 | BUG_ON(!mirror_num); |
1988 | ||
c5e4c3d7 | 1989 | bio = btrfs_io_bio_alloc(1); |
4f024f37 | 1990 | bio->bi_iter.bi_size = 0; |
4a54c8c1 JS |
1991 | map_length = length; |
1992 | ||
b5de8d0d FM |
1993 | /* |
1994 | * Avoid races with device replace and make sure our bbio has devices | |
1995 | * associated to its stripes that don't go away while we are doing the | |
1996 | * read repair operation. | |
1997 | */ | |
1998 | btrfs_bio_counter_inc_blocked(fs_info); | |
e4ff5fb5 | 1999 | if (btrfs_is_parity_mirror(fs_info, logical, length)) { |
c725328c LB |
2000 | /* |
2001 | * Note that we don't use BTRFS_MAP_WRITE because it's supposed | |
2002 | * to update all raid stripes, but here we just want to correct | |
2003 | * bad stripe, thus BTRFS_MAP_READ is abused to only get the bad | |
2004 | * stripe's dev and sector. | |
2005 | */ | |
2006 | ret = btrfs_map_block(fs_info, BTRFS_MAP_READ, logical, | |
2007 | &map_length, &bbio, 0); | |
2008 | if (ret) { | |
2009 | btrfs_bio_counter_dec(fs_info); | |
2010 | bio_put(bio); | |
2011 | return -EIO; | |
2012 | } | |
2013 | ASSERT(bbio->mirror_num == 1); | |
2014 | } else { | |
2015 | ret = btrfs_map_block(fs_info, BTRFS_MAP_WRITE, logical, | |
2016 | &map_length, &bbio, mirror_num); | |
2017 | if (ret) { | |
2018 | btrfs_bio_counter_dec(fs_info); | |
2019 | bio_put(bio); | |
2020 | return -EIO; | |
2021 | } | |
2022 | BUG_ON(mirror_num != bbio->mirror_num); | |
4a54c8c1 | 2023 | } |
c725328c LB |
2024 | |
2025 | sector = bbio->stripes[bbio->mirror_num - 1].physical >> 9; | |
4f024f37 | 2026 | bio->bi_iter.bi_sector = sector; |
c725328c | 2027 | dev = bbio->stripes[bbio->mirror_num - 1].dev; |
6e9606d2 | 2028 | btrfs_put_bbio(bbio); |
4a54c8c1 | 2029 | if (!dev || !dev->bdev || !dev->writeable) { |
b5de8d0d | 2030 | btrfs_bio_counter_dec(fs_info); |
4a54c8c1 JS |
2031 | bio_put(bio); |
2032 | return -EIO; | |
2033 | } | |
74d46992 | 2034 | bio_set_dev(bio, dev->bdev); |
70fd7614 | 2035 | bio->bi_opf = REQ_OP_WRITE | REQ_SYNC; |
ffdd2018 | 2036 | bio_add_page(bio, page, length, pg_offset); |
4a54c8c1 | 2037 | |
4e49ea4a | 2038 | if (btrfsic_submit_bio_wait(bio)) { |
4a54c8c1 | 2039 | /* try to remap that extent elsewhere? */ |
b5de8d0d | 2040 | btrfs_bio_counter_dec(fs_info); |
4a54c8c1 | 2041 | bio_put(bio); |
442a4f63 | 2042 | btrfs_dev_stat_inc_and_print(dev, BTRFS_DEV_STAT_WRITE_ERRS); |
4a54c8c1 JS |
2043 | return -EIO; |
2044 | } | |
2045 | ||
b14af3b4 DS |
2046 | btrfs_info_rl_in_rcu(fs_info, |
2047 | "read error corrected: ino %llu off %llu (dev %s sector %llu)", | |
6ec656bc | 2048 | ino, start, |
1203b681 | 2049 | rcu_str_deref(dev->name), sector); |
b5de8d0d | 2050 | btrfs_bio_counter_dec(fs_info); |
4a54c8c1 JS |
2051 | bio_put(bio); |
2052 | return 0; | |
2053 | } | |
2054 | ||
2ff7e61e JM |
2055 | int repair_eb_io_failure(struct btrfs_fs_info *fs_info, |
2056 | struct extent_buffer *eb, int mirror_num) | |
ea466794 | 2057 | { |
ea466794 JB |
2058 | u64 start = eb->start; |
2059 | unsigned long i, num_pages = num_extent_pages(eb->start, eb->len); | |
d95603b2 | 2060 | int ret = 0; |
ea466794 | 2061 | |
bc98a42c | 2062 | if (sb_rdonly(fs_info->sb)) |
908960c6 ID |
2063 | return -EROFS; |
2064 | ||
ea466794 | 2065 | for (i = 0; i < num_pages; i++) { |
fb85fc9a | 2066 | struct page *p = eb->pages[i]; |
1203b681 | 2067 | |
6ec656bc | 2068 | ret = repair_io_failure(fs_info, 0, start, PAGE_SIZE, start, p, |
1203b681 | 2069 | start - page_offset(p), mirror_num); |
ea466794 JB |
2070 | if (ret) |
2071 | break; | |
09cbfeaf | 2072 | start += PAGE_SIZE; |
ea466794 JB |
2073 | } |
2074 | ||
2075 | return ret; | |
2076 | } | |
2077 | ||
4a54c8c1 JS |
2078 | /* |
2079 | * each time an IO finishes, we do a fast check in the IO failure tree | |
2080 | * to see if we need to process or clean up an io_failure_record | |
2081 | */ | |
7870d082 JB |
2082 | int clean_io_failure(struct btrfs_fs_info *fs_info, |
2083 | struct extent_io_tree *failure_tree, | |
2084 | struct extent_io_tree *io_tree, u64 start, | |
2085 | struct page *page, u64 ino, unsigned int pg_offset) | |
4a54c8c1 JS |
2086 | { |
2087 | u64 private; | |
4a54c8c1 | 2088 | struct io_failure_record *failrec; |
4a54c8c1 JS |
2089 | struct extent_state *state; |
2090 | int num_copies; | |
4a54c8c1 | 2091 | int ret; |
4a54c8c1 JS |
2092 | |
2093 | private = 0; | |
7870d082 JB |
2094 | ret = count_range_bits(failure_tree, &private, (u64)-1, 1, |
2095 | EXTENT_DIRTY, 0); | |
4a54c8c1 JS |
2096 | if (!ret) |
2097 | return 0; | |
2098 | ||
7870d082 | 2099 | ret = get_state_failrec(failure_tree, start, &failrec); |
4a54c8c1 JS |
2100 | if (ret) |
2101 | return 0; | |
2102 | ||
4a54c8c1 JS |
2103 | BUG_ON(!failrec->this_mirror); |
2104 | ||
2105 | if (failrec->in_validation) { | |
2106 | /* there was no real error, just free the record */ | |
ab8d0fc4 JM |
2107 | btrfs_debug(fs_info, |
2108 | "clean_io_failure: freeing dummy error at %llu", | |
2109 | failrec->start); | |
4a54c8c1 JS |
2110 | goto out; |
2111 | } | |
bc98a42c | 2112 | if (sb_rdonly(fs_info->sb)) |
908960c6 | 2113 | goto out; |
4a54c8c1 | 2114 | |
7870d082 JB |
2115 | spin_lock(&io_tree->lock); |
2116 | state = find_first_extent_bit_state(io_tree, | |
4a54c8c1 JS |
2117 | failrec->start, |
2118 | EXTENT_LOCKED); | |
7870d082 | 2119 | spin_unlock(&io_tree->lock); |
4a54c8c1 | 2120 | |
883d0de4 MX |
2121 | if (state && state->start <= failrec->start && |
2122 | state->end >= failrec->start + failrec->len - 1) { | |
3ec706c8 SB |
2123 | num_copies = btrfs_num_copies(fs_info, failrec->logical, |
2124 | failrec->len); | |
4a54c8c1 | 2125 | if (num_copies > 1) { |
7870d082 JB |
2126 | repair_io_failure(fs_info, ino, start, failrec->len, |
2127 | failrec->logical, page, pg_offset, | |
2128 | failrec->failed_mirror); | |
4a54c8c1 JS |
2129 | } |
2130 | } | |
2131 | ||
2132 | out: | |
7870d082 | 2133 | free_io_failure(failure_tree, io_tree, failrec); |
4a54c8c1 | 2134 | |
454ff3de | 2135 | return 0; |
4a54c8c1 JS |
2136 | } |
2137 | ||
f612496b MX |
2138 | /* |
2139 | * Can be called when | |
2140 | * - hold extent lock | |
2141 | * - under ordered extent | |
2142 | * - the inode is freeing | |
2143 | */ | |
7ab7956e | 2144 | void btrfs_free_io_failure_record(struct btrfs_inode *inode, u64 start, u64 end) |
f612496b | 2145 | { |
7ab7956e | 2146 | struct extent_io_tree *failure_tree = &inode->io_failure_tree; |
f612496b MX |
2147 | struct io_failure_record *failrec; |
2148 | struct extent_state *state, *next; | |
2149 | ||
2150 | if (RB_EMPTY_ROOT(&failure_tree->state)) | |
2151 | return; | |
2152 | ||
2153 | spin_lock(&failure_tree->lock); | |
2154 | state = find_first_extent_bit_state(failure_tree, start, EXTENT_DIRTY); | |
2155 | while (state) { | |
2156 | if (state->start > end) | |
2157 | break; | |
2158 | ||
2159 | ASSERT(state->end <= end); | |
2160 | ||
2161 | next = next_state(state); | |
2162 | ||
47dc196a | 2163 | failrec = state->failrec; |
f612496b MX |
2164 | free_extent_state(state); |
2165 | kfree(failrec); | |
2166 | ||
2167 | state = next; | |
2168 | } | |
2169 | spin_unlock(&failure_tree->lock); | |
2170 | } | |
2171 | ||
2fe6303e | 2172 | int btrfs_get_io_failure_record(struct inode *inode, u64 start, u64 end, |
47dc196a | 2173 | struct io_failure_record **failrec_ret) |
4a54c8c1 | 2174 | { |
ab8d0fc4 | 2175 | struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); |
2fe6303e | 2176 | struct io_failure_record *failrec; |
4a54c8c1 | 2177 | struct extent_map *em; |
4a54c8c1 JS |
2178 | struct extent_io_tree *failure_tree = &BTRFS_I(inode)->io_failure_tree; |
2179 | struct extent_io_tree *tree = &BTRFS_I(inode)->io_tree; | |
2180 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; | |
4a54c8c1 | 2181 | int ret; |
4a54c8c1 JS |
2182 | u64 logical; |
2183 | ||
47dc196a | 2184 | ret = get_state_failrec(failure_tree, start, &failrec); |
4a54c8c1 JS |
2185 | if (ret) { |
2186 | failrec = kzalloc(sizeof(*failrec), GFP_NOFS); | |
2187 | if (!failrec) | |
2188 | return -ENOMEM; | |
2fe6303e | 2189 | |
4a54c8c1 JS |
2190 | failrec->start = start; |
2191 | failrec->len = end - start + 1; | |
2192 | failrec->this_mirror = 0; | |
2193 | failrec->bio_flags = 0; | |
2194 | failrec->in_validation = 0; | |
2195 | ||
2196 | read_lock(&em_tree->lock); | |
2197 | em = lookup_extent_mapping(em_tree, start, failrec->len); | |
2198 | if (!em) { | |
2199 | read_unlock(&em_tree->lock); | |
2200 | kfree(failrec); | |
2201 | return -EIO; | |
2202 | } | |
2203 | ||
68ba990f | 2204 | if (em->start > start || em->start + em->len <= start) { |
4a54c8c1 JS |
2205 | free_extent_map(em); |
2206 | em = NULL; | |
2207 | } | |
2208 | read_unlock(&em_tree->lock); | |
7a2d6a64 | 2209 | if (!em) { |
4a54c8c1 JS |
2210 | kfree(failrec); |
2211 | return -EIO; | |
2212 | } | |
2fe6303e | 2213 | |
4a54c8c1 JS |
2214 | logical = start - em->start; |
2215 | logical = em->block_start + logical; | |
2216 | if (test_bit(EXTENT_FLAG_COMPRESSED, &em->flags)) { | |
2217 | logical = em->block_start; | |
2218 | failrec->bio_flags = EXTENT_BIO_COMPRESSED; | |
2219 | extent_set_compress_type(&failrec->bio_flags, | |
2220 | em->compress_type); | |
2221 | } | |
2fe6303e | 2222 | |
ab8d0fc4 JM |
2223 | btrfs_debug(fs_info, |
2224 | "Get IO Failure Record: (new) logical=%llu, start=%llu, len=%llu", | |
2225 | logical, start, failrec->len); | |
2fe6303e | 2226 | |
4a54c8c1 JS |
2227 | failrec->logical = logical; |
2228 | free_extent_map(em); | |
2229 | ||
2230 | /* set the bits in the private failure tree */ | |
2231 | ret = set_extent_bits(failure_tree, start, end, | |
ceeb0ae7 | 2232 | EXTENT_LOCKED | EXTENT_DIRTY); |
4a54c8c1 | 2233 | if (ret >= 0) |
47dc196a | 2234 | ret = set_state_failrec(failure_tree, start, failrec); |
4a54c8c1 JS |
2235 | /* set the bits in the inode's tree */ |
2236 | if (ret >= 0) | |
ceeb0ae7 | 2237 | ret = set_extent_bits(tree, start, end, EXTENT_DAMAGED); |
4a54c8c1 JS |
2238 | if (ret < 0) { |
2239 | kfree(failrec); | |
2240 | return ret; | |
2241 | } | |
2242 | } else { | |
ab8d0fc4 JM |
2243 | btrfs_debug(fs_info, |
2244 | "Get IO Failure Record: (found) logical=%llu, start=%llu, len=%llu, validation=%d", | |
2245 | failrec->logical, failrec->start, failrec->len, | |
2246 | failrec->in_validation); | |
4a54c8c1 JS |
2247 | /* |
2248 | * when data can be on disk more than twice, add to failrec here | |
2249 | * (e.g. with a list for failed_mirror) to make | |
2250 | * clean_io_failure() clean all those errors at once. | |
2251 | */ | |
2252 | } | |
2fe6303e MX |
2253 | |
2254 | *failrec_ret = failrec; | |
2255 | ||
2256 | return 0; | |
2257 | } | |
2258 | ||
c3cfb656 | 2259 | bool btrfs_check_repairable(struct inode *inode, struct bio *failed_bio, |
2fe6303e MX |
2260 | struct io_failure_record *failrec, int failed_mirror) |
2261 | { | |
ab8d0fc4 | 2262 | struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); |
2fe6303e MX |
2263 | int num_copies; |
2264 | ||
ab8d0fc4 | 2265 | num_copies = btrfs_num_copies(fs_info, failrec->logical, failrec->len); |
4a54c8c1 JS |
2266 | if (num_copies == 1) { |
2267 | /* | |
2268 | * we only have a single copy of the data, so don't bother with | |
2269 | * all the retry and error correction code that follows. no | |
2270 | * matter what the error is, it is very likely to persist. | |
2271 | */ | |
ab8d0fc4 JM |
2272 | btrfs_debug(fs_info, |
2273 | "Check Repairable: cannot repair, num_copies=%d, next_mirror %d, failed_mirror %d", | |
2274 | num_copies, failrec->this_mirror, failed_mirror); | |
c3cfb656 | 2275 | return false; |
4a54c8c1 JS |
2276 | } |
2277 | ||
4a54c8c1 JS |
2278 | /* |
2279 | * there are two premises: | |
2280 | * a) deliver good data to the caller | |
2281 | * b) correct the bad sectors on disk | |
2282 | */ | |
2283 | if (failed_bio->bi_vcnt > 1) { | |
2284 | /* | |
2285 | * to fulfill b), we need to know the exact failing sectors, as | |
2286 | * we don't want to rewrite any more than the failed ones. thus, | |
2287 | * we need separate read requests for the failed bio | |
2288 | * | |
2289 | * if the following BUG_ON triggers, our validation request got | |
2290 | * merged. we need separate requests for our algorithm to work. | |
2291 | */ | |
2292 | BUG_ON(failrec->in_validation); | |
2293 | failrec->in_validation = 1; | |
2294 | failrec->this_mirror = failed_mirror; | |
4a54c8c1 JS |
2295 | } else { |
2296 | /* | |
2297 | * we're ready to fulfill a) and b) alongside. get a good copy | |
2298 | * of the failed sector and if we succeed, we have setup | |
2299 | * everything for repair_io_failure to do the rest for us. | |
2300 | */ | |
2301 | if (failrec->in_validation) { | |
2302 | BUG_ON(failrec->this_mirror != failed_mirror); | |
2303 | failrec->in_validation = 0; | |
2304 | failrec->this_mirror = 0; | |
2305 | } | |
2306 | failrec->failed_mirror = failed_mirror; | |
2307 | failrec->this_mirror++; | |
2308 | if (failrec->this_mirror == failed_mirror) | |
2309 | failrec->this_mirror++; | |
4a54c8c1 JS |
2310 | } |
2311 | ||
facc8a22 | 2312 | if (failrec->this_mirror > num_copies) { |
ab8d0fc4 JM |
2313 | btrfs_debug(fs_info, |
2314 | "Check Repairable: (fail) num_copies=%d, next_mirror %d, failed_mirror %d", | |
2315 | num_copies, failrec->this_mirror, failed_mirror); | |
c3cfb656 | 2316 | return false; |
4a54c8c1 JS |
2317 | } |
2318 | ||
c3cfb656 | 2319 | return true; |
2fe6303e MX |
2320 | } |
2321 | ||
2322 | ||
2323 | struct bio *btrfs_create_repair_bio(struct inode *inode, struct bio *failed_bio, | |
2324 | struct io_failure_record *failrec, | |
2325 | struct page *page, int pg_offset, int icsum, | |
8b110e39 | 2326 | bio_end_io_t *endio_func, void *data) |
2fe6303e | 2327 | { |
0b246afa | 2328 | struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); |
2fe6303e MX |
2329 | struct bio *bio; |
2330 | struct btrfs_io_bio *btrfs_failed_bio; | |
2331 | struct btrfs_io_bio *btrfs_bio; | |
2332 | ||
c5e4c3d7 | 2333 | bio = btrfs_io_bio_alloc(1); |
2fe6303e | 2334 | bio->bi_end_io = endio_func; |
4f024f37 | 2335 | bio->bi_iter.bi_sector = failrec->logical >> 9; |
74d46992 | 2336 | bio_set_dev(bio, fs_info->fs_devices->latest_bdev); |
4f024f37 | 2337 | bio->bi_iter.bi_size = 0; |
8b110e39 | 2338 | bio->bi_private = data; |
4a54c8c1 | 2339 | |
facc8a22 MX |
2340 | btrfs_failed_bio = btrfs_io_bio(failed_bio); |
2341 | if (btrfs_failed_bio->csum) { | |
facc8a22 MX |
2342 | u16 csum_size = btrfs_super_csum_size(fs_info->super_copy); |
2343 | ||
2344 | btrfs_bio = btrfs_io_bio(bio); | |
2345 | btrfs_bio->csum = btrfs_bio->csum_inline; | |
2fe6303e MX |
2346 | icsum *= csum_size; |
2347 | memcpy(btrfs_bio->csum, btrfs_failed_bio->csum + icsum, | |
facc8a22 MX |
2348 | csum_size); |
2349 | } | |
2350 | ||
2fe6303e MX |
2351 | bio_add_page(bio, page, failrec->len, pg_offset); |
2352 | ||
2353 | return bio; | |
2354 | } | |
2355 | ||
2356 | /* | |
2357 | * this is a generic handler for readpage errors (default | |
2358 | * readpage_io_failed_hook). if other copies exist, read those and write back | |
2359 | * good data to the failed position. does not investigate in remapping the | |
2360 | * failed extent elsewhere, hoping the device will be smart enough to do this as | |
2361 | * needed | |
2362 | */ | |
2363 | ||
2364 | static int bio_readpage_error(struct bio *failed_bio, u64 phy_offset, | |
2365 | struct page *page, u64 start, u64 end, | |
2366 | int failed_mirror) | |
2367 | { | |
2368 | struct io_failure_record *failrec; | |
2369 | struct inode *inode = page->mapping->host; | |
2370 | struct extent_io_tree *tree = &BTRFS_I(inode)->io_tree; | |
7870d082 | 2371 | struct extent_io_tree *failure_tree = &BTRFS_I(inode)->io_failure_tree; |
2fe6303e | 2372 | struct bio *bio; |
70fd7614 | 2373 | int read_mode = 0; |
4e4cbee9 | 2374 | blk_status_t status; |
2fe6303e MX |
2375 | int ret; |
2376 | ||
1f7ad75b | 2377 | BUG_ON(bio_op(failed_bio) == REQ_OP_WRITE); |
2fe6303e MX |
2378 | |
2379 | ret = btrfs_get_io_failure_record(inode, start, end, &failrec); | |
2380 | if (ret) | |
2381 | return ret; | |
2382 | ||
c3cfb656 LB |
2383 | if (!btrfs_check_repairable(inode, failed_bio, failrec, |
2384 | failed_mirror)) { | |
7870d082 | 2385 | free_io_failure(failure_tree, tree, failrec); |
2fe6303e MX |
2386 | return -EIO; |
2387 | } | |
2388 | ||
2389 | if (failed_bio->bi_vcnt > 1) | |
70fd7614 | 2390 | read_mode |= REQ_FAILFAST_DEV; |
2fe6303e MX |
2391 | |
2392 | phy_offset >>= inode->i_sb->s_blocksize_bits; | |
2393 | bio = btrfs_create_repair_bio(inode, failed_bio, failrec, page, | |
2394 | start - page_offset(page), | |
8b110e39 MX |
2395 | (int)phy_offset, failed_bio->bi_end_io, |
2396 | NULL); | |
1f7ad75b | 2397 | bio_set_op_attrs(bio, REQ_OP_READ, read_mode); |
4a54c8c1 | 2398 | |
ab8d0fc4 JM |
2399 | btrfs_debug(btrfs_sb(inode->i_sb), |
2400 | "Repair Read Error: submitting new read[%#x] to this_mirror=%d, in_validation=%d", | |
2401 | read_mode, failrec->this_mirror, failrec->in_validation); | |
4a54c8c1 | 2402 | |
8c27cb35 | 2403 | status = tree->ops->submit_bio_hook(tree->private_data, bio, failrec->this_mirror, |
013bd4c3 | 2404 | failrec->bio_flags, 0); |
4e4cbee9 | 2405 | if (status) { |
7870d082 | 2406 | free_io_failure(failure_tree, tree, failrec); |
6c387ab2 | 2407 | bio_put(bio); |
4e4cbee9 | 2408 | ret = blk_status_to_errno(status); |
6c387ab2 MX |
2409 | } |
2410 | ||
013bd4c3 | 2411 | return ret; |
4a54c8c1 JS |
2412 | } |
2413 | ||
d1310b2e CM |
2414 | /* lots and lots of room for performance fixes in the end_bio funcs */ |
2415 | ||
b5227c07 | 2416 | void end_extent_writepage(struct page *page, int err, u64 start, u64 end) |
87826df0 JM |
2417 | { |
2418 | int uptodate = (err == 0); | |
2419 | struct extent_io_tree *tree; | |
3e2426bd | 2420 | int ret = 0; |
87826df0 JM |
2421 | |
2422 | tree = &BTRFS_I(page->mapping->host)->io_tree; | |
2423 | ||
c3988d63 DS |
2424 | if (tree->ops && tree->ops->writepage_end_io_hook) |
2425 | tree->ops->writepage_end_io_hook(page, start, end, NULL, | |
2426 | uptodate); | |
87826df0 | 2427 | |
87826df0 | 2428 | if (!uptodate) { |
87826df0 JM |
2429 | ClearPageUptodate(page); |
2430 | SetPageError(page); | |
bff5baf8 | 2431 | ret = err < 0 ? err : -EIO; |
5dca6eea | 2432 | mapping_set_error(page->mapping, ret); |
87826df0 | 2433 | } |
87826df0 JM |
2434 | } |
2435 | ||
d1310b2e CM |
2436 | /* |
2437 | * after a writepage IO is done, we need to: | |
2438 | * clear the uptodate bits on error | |
2439 | * clear the writeback bits in the extent tree for this IO | |
2440 | * end_page_writeback if the page has no more pending IO | |
2441 | * | |
2442 | * Scheduling is not allowed, so the extent state tree is expected | |
2443 | * to have one and only one object corresponding to this IO. | |
2444 | */ | |
4246a0b6 | 2445 | static void end_bio_extent_writepage(struct bio *bio) |
d1310b2e | 2446 | { |
4e4cbee9 | 2447 | int error = blk_status_to_errno(bio->bi_status); |
2c30c71b | 2448 | struct bio_vec *bvec; |
d1310b2e CM |
2449 | u64 start; |
2450 | u64 end; | |
2c30c71b | 2451 | int i; |
d1310b2e | 2452 | |
c09abff8 | 2453 | ASSERT(!bio_flagged(bio, BIO_CLONED)); |
2c30c71b | 2454 | bio_for_each_segment_all(bvec, bio, i) { |
d1310b2e | 2455 | struct page *page = bvec->bv_page; |
0b246afa JM |
2456 | struct inode *inode = page->mapping->host; |
2457 | struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); | |
902b22f3 | 2458 | |
17a5adcc AO |
2459 | /* We always issue full-page reads, but if some block |
2460 | * in a page fails to read, blk_update_request() will | |
2461 | * advance bv_offset and adjust bv_len to compensate. | |
2462 | * Print a warning for nonzero offsets, and an error | |
2463 | * if they don't add up to a full page. */ | |
09cbfeaf KS |
2464 | if (bvec->bv_offset || bvec->bv_len != PAGE_SIZE) { |
2465 | if (bvec->bv_offset + bvec->bv_len != PAGE_SIZE) | |
0b246afa | 2466 | btrfs_err(fs_info, |
efe120a0 FH |
2467 | "partial page write in btrfs with offset %u and length %u", |
2468 | bvec->bv_offset, bvec->bv_len); | |
2469 | else | |
0b246afa | 2470 | btrfs_info(fs_info, |
5d163e0e | 2471 | "incomplete page write in btrfs with offset %u and length %u", |
efe120a0 FH |
2472 | bvec->bv_offset, bvec->bv_len); |
2473 | } | |
d1310b2e | 2474 | |
17a5adcc AO |
2475 | start = page_offset(page); |
2476 | end = start + bvec->bv_offset + bvec->bv_len - 1; | |
d1310b2e | 2477 | |
4e4cbee9 | 2478 | end_extent_writepage(page, error, start, end); |
17a5adcc | 2479 | end_page_writeback(page); |
2c30c71b | 2480 | } |
2b1f55b0 | 2481 | |
d1310b2e | 2482 | bio_put(bio); |
d1310b2e CM |
2483 | } |
2484 | ||
883d0de4 MX |
2485 | static void |
2486 | endio_readpage_release_extent(struct extent_io_tree *tree, u64 start, u64 len, | |
2487 | int uptodate) | |
2488 | { | |
2489 | struct extent_state *cached = NULL; | |
2490 | u64 end = start + len - 1; | |
2491 | ||
2492 | if (uptodate && tree->track_uptodate) | |
2493 | set_extent_uptodate(tree, start, end, &cached, GFP_ATOMIC); | |
2494 | unlock_extent_cached(tree, start, end, &cached, GFP_ATOMIC); | |
2495 | } | |
2496 | ||
d1310b2e CM |
2497 | /* |
2498 | * after a readpage IO is done, we need to: | |
2499 | * clear the uptodate bits on error | |
2500 | * set the uptodate bits if things worked | |
2501 | * set the page up to date if all extents in the tree are uptodate | |
2502 | * clear the lock bit in the extent tree | |
2503 | * unlock the page if there are no other extents locked for it | |
2504 | * | |
2505 | * Scheduling is not allowed, so the extent state tree is expected | |
2506 | * to have one and only one object corresponding to this IO. | |
2507 | */ | |
4246a0b6 | 2508 | static void end_bio_extent_readpage(struct bio *bio) |
d1310b2e | 2509 | { |
2c30c71b | 2510 | struct bio_vec *bvec; |
4e4cbee9 | 2511 | int uptodate = !bio->bi_status; |
facc8a22 | 2512 | struct btrfs_io_bio *io_bio = btrfs_io_bio(bio); |
7870d082 | 2513 | struct extent_io_tree *tree, *failure_tree; |
facc8a22 | 2514 | u64 offset = 0; |
d1310b2e CM |
2515 | u64 start; |
2516 | u64 end; | |
facc8a22 | 2517 | u64 len; |
883d0de4 MX |
2518 | u64 extent_start = 0; |
2519 | u64 extent_len = 0; | |
5cf1ab56 | 2520 | int mirror; |
d1310b2e | 2521 | int ret; |
2c30c71b | 2522 | int i; |
d1310b2e | 2523 | |
c09abff8 | 2524 | ASSERT(!bio_flagged(bio, BIO_CLONED)); |
2c30c71b | 2525 | bio_for_each_segment_all(bvec, bio, i) { |
d1310b2e | 2526 | struct page *page = bvec->bv_page; |
a71754fc | 2527 | struct inode *inode = page->mapping->host; |
ab8d0fc4 | 2528 | struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); |
507903b8 | 2529 | |
ab8d0fc4 JM |
2530 | btrfs_debug(fs_info, |
2531 | "end_bio_extent_readpage: bi_sector=%llu, err=%d, mirror=%u", | |
4e4cbee9 | 2532 | (u64)bio->bi_iter.bi_sector, bio->bi_status, |
ab8d0fc4 | 2533 | io_bio->mirror_num); |
a71754fc | 2534 | tree = &BTRFS_I(inode)->io_tree; |
7870d082 | 2535 | failure_tree = &BTRFS_I(inode)->io_failure_tree; |
902b22f3 | 2536 | |
17a5adcc AO |
2537 | /* We always issue full-page reads, but if some block |
2538 | * in a page fails to read, blk_update_request() will | |
2539 | * advance bv_offset and adjust bv_len to compensate. | |
2540 | * Print a warning for nonzero offsets, and an error | |
2541 | * if they don't add up to a full page. */ | |
09cbfeaf KS |
2542 | if (bvec->bv_offset || bvec->bv_len != PAGE_SIZE) { |
2543 | if (bvec->bv_offset + bvec->bv_len != PAGE_SIZE) | |
ab8d0fc4 JM |
2544 | btrfs_err(fs_info, |
2545 | "partial page read in btrfs with offset %u and length %u", | |
efe120a0 FH |
2546 | bvec->bv_offset, bvec->bv_len); |
2547 | else | |
ab8d0fc4 JM |
2548 | btrfs_info(fs_info, |
2549 | "incomplete page read in btrfs with offset %u and length %u", | |
efe120a0 FH |
2550 | bvec->bv_offset, bvec->bv_len); |
2551 | } | |
d1310b2e | 2552 | |
17a5adcc AO |
2553 | start = page_offset(page); |
2554 | end = start + bvec->bv_offset + bvec->bv_len - 1; | |
facc8a22 | 2555 | len = bvec->bv_len; |
d1310b2e | 2556 | |
9be3395b | 2557 | mirror = io_bio->mirror_num; |
20c9801d | 2558 | if (likely(uptodate && tree->ops)) { |
facc8a22 MX |
2559 | ret = tree->ops->readpage_end_io_hook(io_bio, offset, |
2560 | page, start, end, | |
2561 | mirror); | |
5ee0844d | 2562 | if (ret) |
d1310b2e | 2563 | uptodate = 0; |
5ee0844d | 2564 | else |
7870d082 JB |
2565 | clean_io_failure(BTRFS_I(inode)->root->fs_info, |
2566 | failure_tree, tree, start, | |
2567 | page, | |
2568 | btrfs_ino(BTRFS_I(inode)), 0); | |
d1310b2e | 2569 | } |
ea466794 | 2570 | |
f2a09da9 MX |
2571 | if (likely(uptodate)) |
2572 | goto readpage_ok; | |
2573 | ||
20a7db8a | 2574 | if (tree->ops) { |
5cf1ab56 | 2575 | ret = tree->ops->readpage_io_failed_hook(page, mirror); |
9d0d1c8b LB |
2576 | if (ret == -EAGAIN) { |
2577 | /* | |
2578 | * Data inode's readpage_io_failed_hook() always | |
2579 | * returns -EAGAIN. | |
2580 | * | |
2581 | * The generic bio_readpage_error handles errors | |
2582 | * the following way: If possible, new read | |
2583 | * requests are created and submitted and will | |
2584 | * end up in end_bio_extent_readpage as well (if | |
2585 | * we're lucky, not in the !uptodate case). In | |
2586 | * that case it returns 0 and we just go on with | |
2587 | * the next page in our bio. If it can't handle | |
2588 | * the error it will return -EIO and we remain | |
2589 | * responsible for that page. | |
2590 | */ | |
2591 | ret = bio_readpage_error(bio, offset, page, | |
2592 | start, end, mirror); | |
2593 | if (ret == 0) { | |
4e4cbee9 | 2594 | uptodate = !bio->bi_status; |
9d0d1c8b LB |
2595 | offset += len; |
2596 | continue; | |
2597 | } | |
2598 | } | |
2599 | ||
f4a8e656 | 2600 | /* |
9d0d1c8b LB |
2601 | * metadata's readpage_io_failed_hook() always returns |
2602 | * -EIO and fixes nothing. -EIO is also returned if | |
2603 | * data inode error could not be fixed. | |
f4a8e656 | 2604 | */ |
9d0d1c8b | 2605 | ASSERT(ret == -EIO); |
7e38326f | 2606 | } |
f2a09da9 | 2607 | readpage_ok: |
883d0de4 | 2608 | if (likely(uptodate)) { |
a71754fc | 2609 | loff_t i_size = i_size_read(inode); |
09cbfeaf | 2610 | pgoff_t end_index = i_size >> PAGE_SHIFT; |
a583c026 | 2611 | unsigned off; |
a71754fc JB |
2612 | |
2613 | /* Zero out the end if this page straddles i_size */ | |
09cbfeaf | 2614 | off = i_size & (PAGE_SIZE-1); |
a583c026 | 2615 | if (page->index == end_index && off) |
09cbfeaf | 2616 | zero_user_segment(page, off, PAGE_SIZE); |
17a5adcc | 2617 | SetPageUptodate(page); |
70dec807 | 2618 | } else { |
17a5adcc AO |
2619 | ClearPageUptodate(page); |
2620 | SetPageError(page); | |
70dec807 | 2621 | } |
17a5adcc | 2622 | unlock_page(page); |
facc8a22 | 2623 | offset += len; |
883d0de4 MX |
2624 | |
2625 | if (unlikely(!uptodate)) { | |
2626 | if (extent_len) { | |
2627 | endio_readpage_release_extent(tree, | |
2628 | extent_start, | |
2629 | extent_len, 1); | |
2630 | extent_start = 0; | |
2631 | extent_len = 0; | |
2632 | } | |
2633 | endio_readpage_release_extent(tree, start, | |
2634 | end - start + 1, 0); | |
2635 | } else if (!extent_len) { | |
2636 | extent_start = start; | |
2637 | extent_len = end + 1 - start; | |
2638 | } else if (extent_start + extent_len == start) { | |
2639 | extent_len += end + 1 - start; | |
2640 | } else { | |
2641 | endio_readpage_release_extent(tree, extent_start, | |
2642 | extent_len, uptodate); | |
2643 | extent_start = start; | |
2644 | extent_len = end + 1 - start; | |
2645 | } | |
2c30c71b | 2646 | } |
d1310b2e | 2647 | |
883d0de4 MX |
2648 | if (extent_len) |
2649 | endio_readpage_release_extent(tree, extent_start, extent_len, | |
2650 | uptodate); | |
facc8a22 | 2651 | if (io_bio->end_io) |
4e4cbee9 | 2652 | io_bio->end_io(io_bio, blk_status_to_errno(bio->bi_status)); |
d1310b2e | 2653 | bio_put(bio); |
d1310b2e CM |
2654 | } |
2655 | ||
9be3395b | 2656 | /* |
184f999e DS |
2657 | * Initialize the members up to but not including 'bio'. Use after allocating a |
2658 | * new bio by bio_alloc_bioset as it does not initialize the bytes outside of | |
2659 | * 'bio' because use of __GFP_ZERO is not supported. | |
9be3395b | 2660 | */ |
184f999e | 2661 | static inline void btrfs_io_bio_init(struct btrfs_io_bio *btrfs_bio) |
d1310b2e | 2662 | { |
184f999e DS |
2663 | memset(btrfs_bio, 0, offsetof(struct btrfs_io_bio, bio)); |
2664 | } | |
d1310b2e | 2665 | |
9be3395b | 2666 | /* |
6e707bcd DS |
2667 | * The following helpers allocate a bio. As it's backed by a bioset, it'll |
2668 | * never fail. We're returning a bio right now but you can call btrfs_io_bio | |
2669 | * for the appropriate container_of magic | |
9be3395b | 2670 | */ |
c821e7f3 | 2671 | struct bio *btrfs_bio_alloc(struct block_device *bdev, u64 first_byte) |
d1310b2e CM |
2672 | { |
2673 | struct bio *bio; | |
d1310b2e | 2674 | |
9f2179a5 | 2675 | bio = bio_alloc_bioset(GFP_NOFS, BIO_MAX_PAGES, btrfs_bioset); |
74d46992 | 2676 | bio_set_dev(bio, bdev); |
c821e7f3 | 2677 | bio->bi_iter.bi_sector = first_byte >> 9; |
184f999e | 2678 | btrfs_io_bio_init(btrfs_io_bio(bio)); |
d1310b2e CM |
2679 | return bio; |
2680 | } | |
2681 | ||
8b6c1d56 | 2682 | struct bio *btrfs_bio_clone(struct bio *bio) |
9be3395b | 2683 | { |
23ea8e5a MX |
2684 | struct btrfs_io_bio *btrfs_bio; |
2685 | struct bio *new; | |
9be3395b | 2686 | |
6e707bcd | 2687 | /* Bio allocation backed by a bioset does not fail */ |
8b6c1d56 | 2688 | new = bio_clone_fast(bio, GFP_NOFS, btrfs_bioset); |
6e707bcd | 2689 | btrfs_bio = btrfs_io_bio(new); |
184f999e | 2690 | btrfs_io_bio_init(btrfs_bio); |
6e707bcd | 2691 | btrfs_bio->iter = bio->bi_iter; |
23ea8e5a MX |
2692 | return new; |
2693 | } | |
9be3395b | 2694 | |
c5e4c3d7 | 2695 | struct bio *btrfs_io_bio_alloc(unsigned int nr_iovecs) |
9be3395b | 2696 | { |
facc8a22 MX |
2697 | struct bio *bio; |
2698 | ||
6e707bcd | 2699 | /* Bio allocation backed by a bioset does not fail */ |
c5e4c3d7 | 2700 | bio = bio_alloc_bioset(GFP_NOFS, nr_iovecs, btrfs_bioset); |
184f999e | 2701 | btrfs_io_bio_init(btrfs_io_bio(bio)); |
facc8a22 | 2702 | return bio; |
9be3395b CM |
2703 | } |
2704 | ||
e477094f | 2705 | struct bio *btrfs_bio_clone_partial(struct bio *orig, int offset, int size) |
2f8e9140 LB |
2706 | { |
2707 | struct bio *bio; | |
2708 | struct btrfs_io_bio *btrfs_bio; | |
2709 | ||
2710 | /* this will never fail when it's backed by a bioset */ | |
e477094f | 2711 | bio = bio_clone_fast(orig, GFP_NOFS, btrfs_bioset); |
2f8e9140 LB |
2712 | ASSERT(bio); |
2713 | ||
2714 | btrfs_bio = btrfs_io_bio(bio); | |
184f999e | 2715 | btrfs_io_bio_init(btrfs_bio); |
2f8e9140 LB |
2716 | |
2717 | bio_trim(bio, offset >> 9, size >> 9); | |
17347cec | 2718 | btrfs_bio->iter = bio->bi_iter; |
2f8e9140 LB |
2719 | return bio; |
2720 | } | |
9be3395b | 2721 | |
1f7ad75b MC |
2722 | static int __must_check submit_one_bio(struct bio *bio, int mirror_num, |
2723 | unsigned long bio_flags) | |
d1310b2e | 2724 | { |
4e4cbee9 | 2725 | blk_status_t ret = 0; |
70dec807 CM |
2726 | struct bio_vec *bvec = bio->bi_io_vec + bio->bi_vcnt - 1; |
2727 | struct page *page = bvec->bv_page; | |
2728 | struct extent_io_tree *tree = bio->bi_private; | |
70dec807 | 2729 | u64 start; |
70dec807 | 2730 | |
4eee4fa4 | 2731 | start = page_offset(page) + bvec->bv_offset; |
70dec807 | 2732 | |
902b22f3 | 2733 | bio->bi_private = NULL; |
d1310b2e CM |
2734 | bio_get(bio); |
2735 | ||
20c9801d | 2736 | if (tree->ops) |
c6100a4b | 2737 | ret = tree->ops->submit_bio_hook(tree->private_data, bio, |
eaf25d93 | 2738 | mirror_num, bio_flags, start); |
0b86a832 | 2739 | else |
4e49ea4a | 2740 | btrfsic_submit_bio(bio); |
4a54c8c1 | 2741 | |
d1310b2e | 2742 | bio_put(bio); |
4e4cbee9 | 2743 | return blk_status_to_errno(ret); |
d1310b2e CM |
2744 | } |
2745 | ||
1f7ad75b | 2746 | static int merge_bio(struct extent_io_tree *tree, struct page *page, |
3444a972 JM |
2747 | unsigned long offset, size_t size, struct bio *bio, |
2748 | unsigned long bio_flags) | |
2749 | { | |
2750 | int ret = 0; | |
20c9801d | 2751 | if (tree->ops) |
81a75f67 | 2752 | ret = tree->ops->merge_bio_hook(page, offset, size, bio, |
3444a972 | 2753 | bio_flags); |
3444a972 JM |
2754 | return ret; |
2755 | ||
2756 | } | |
2757 | ||
4b81ba48 DS |
2758 | /* |
2759 | * @opf: bio REQ_OP_* and REQ_* flags as one value | |
2760 | */ | |
2761 | static int submit_extent_page(unsigned int opf, struct extent_io_tree *tree, | |
da2f0f74 | 2762 | struct writeback_control *wbc, |
6273b7f8 | 2763 | struct page *page, u64 offset, |
6c5a4e2c | 2764 | size_t size, unsigned long pg_offset, |
d1310b2e CM |
2765 | struct block_device *bdev, |
2766 | struct bio **bio_ret, | |
f188591e | 2767 | bio_end_io_t end_io_func, |
c8b97818 CM |
2768 | int mirror_num, |
2769 | unsigned long prev_bio_flags, | |
005efedf FM |
2770 | unsigned long bio_flags, |
2771 | bool force_bio_submit) | |
d1310b2e CM |
2772 | { |
2773 | int ret = 0; | |
2774 | struct bio *bio; | |
c8b97818 | 2775 | int contig = 0; |
c8b97818 | 2776 | int old_compressed = prev_bio_flags & EXTENT_BIO_COMPRESSED; |
09cbfeaf | 2777 | size_t page_size = min_t(size_t, size, PAGE_SIZE); |
6273b7f8 | 2778 | sector_t sector = offset >> 9; |
d1310b2e CM |
2779 | |
2780 | if (bio_ret && *bio_ret) { | |
2781 | bio = *bio_ret; | |
c8b97818 | 2782 | if (old_compressed) |
4f024f37 | 2783 | contig = bio->bi_iter.bi_sector == sector; |
c8b97818 | 2784 | else |
f73a1c7d | 2785 | contig = bio_end_sector(bio) == sector; |
c8b97818 CM |
2786 | |
2787 | if (prev_bio_flags != bio_flags || !contig || | |
005efedf | 2788 | force_bio_submit || |
6c5a4e2c DS |
2789 | merge_bio(tree, page, pg_offset, page_size, bio, bio_flags) || |
2790 | bio_add_page(bio, page, page_size, pg_offset) < page_size) { | |
1f7ad75b | 2791 | ret = submit_one_bio(bio, mirror_num, prev_bio_flags); |
289454ad NA |
2792 | if (ret < 0) { |
2793 | *bio_ret = NULL; | |
79787eaa | 2794 | return ret; |
289454ad | 2795 | } |
d1310b2e CM |
2796 | bio = NULL; |
2797 | } else { | |
da2f0f74 CM |
2798 | if (wbc) |
2799 | wbc_account_io(wbc, page, page_size); | |
d1310b2e CM |
2800 | return 0; |
2801 | } | |
2802 | } | |
c8b97818 | 2803 | |
6273b7f8 | 2804 | bio = btrfs_bio_alloc(bdev, offset); |
6c5a4e2c | 2805 | bio_add_page(bio, page, page_size, pg_offset); |
d1310b2e CM |
2806 | bio->bi_end_io = end_io_func; |
2807 | bio->bi_private = tree; | |
e6959b93 | 2808 | bio->bi_write_hint = page->mapping->host->i_write_hint; |
4b81ba48 | 2809 | bio->bi_opf = opf; |
da2f0f74 CM |
2810 | if (wbc) { |
2811 | wbc_init_bio(wbc, bio); | |
2812 | wbc_account_io(wbc, page, page_size); | |
2813 | } | |
70dec807 | 2814 | |
d397712b | 2815 | if (bio_ret) |
d1310b2e | 2816 | *bio_ret = bio; |
d397712b | 2817 | else |
1f7ad75b | 2818 | ret = submit_one_bio(bio, mirror_num, bio_flags); |
d1310b2e CM |
2819 | |
2820 | return ret; | |
2821 | } | |
2822 | ||
48a3b636 ES |
2823 | static void attach_extent_buffer_page(struct extent_buffer *eb, |
2824 | struct page *page) | |
d1310b2e CM |
2825 | { |
2826 | if (!PagePrivate(page)) { | |
2827 | SetPagePrivate(page); | |
09cbfeaf | 2828 | get_page(page); |
4f2de97a JB |
2829 | set_page_private(page, (unsigned long)eb); |
2830 | } else { | |
2831 | WARN_ON(page->private != (unsigned long)eb); | |
d1310b2e CM |
2832 | } |
2833 | } | |
2834 | ||
4f2de97a | 2835 | void set_page_extent_mapped(struct page *page) |
d1310b2e | 2836 | { |
4f2de97a JB |
2837 | if (!PagePrivate(page)) { |
2838 | SetPagePrivate(page); | |
09cbfeaf | 2839 | get_page(page); |
4f2de97a JB |
2840 | set_page_private(page, EXTENT_PAGE_PRIVATE); |
2841 | } | |
d1310b2e CM |
2842 | } |
2843 | ||
125bac01 MX |
2844 | static struct extent_map * |
2845 | __get_extent_map(struct inode *inode, struct page *page, size_t pg_offset, | |
2846 | u64 start, u64 len, get_extent_t *get_extent, | |
2847 | struct extent_map **em_cached) | |
2848 | { | |
2849 | struct extent_map *em; | |
2850 | ||
2851 | if (em_cached && *em_cached) { | |
2852 | em = *em_cached; | |
cbc0e928 | 2853 | if (extent_map_in_tree(em) && start >= em->start && |
125bac01 | 2854 | start < extent_map_end(em)) { |
490b54d6 | 2855 | refcount_inc(&em->refs); |
125bac01 MX |
2856 | return em; |
2857 | } | |
2858 | ||
2859 | free_extent_map(em); | |
2860 | *em_cached = NULL; | |
2861 | } | |
2862 | ||
fc4f21b1 | 2863 | em = get_extent(BTRFS_I(inode), page, pg_offset, start, len, 0); |
125bac01 MX |
2864 | if (em_cached && !IS_ERR_OR_NULL(em)) { |
2865 | BUG_ON(*em_cached); | |
490b54d6 | 2866 | refcount_inc(&em->refs); |
125bac01 MX |
2867 | *em_cached = em; |
2868 | } | |
2869 | return em; | |
2870 | } | |
d1310b2e CM |
2871 | /* |
2872 | * basic readpage implementation. Locked extent state structs are inserted | |
2873 | * into the tree that are removed when the IO is done (by the end_io | |
2874 | * handlers) | |
79787eaa | 2875 | * XXX JDM: This needs looking at to ensure proper page locking |
baf863b9 | 2876 | * return 0 on success, otherwise return error |
d1310b2e | 2877 | */ |
9974090b MX |
2878 | static int __do_readpage(struct extent_io_tree *tree, |
2879 | struct page *page, | |
2880 | get_extent_t *get_extent, | |
125bac01 | 2881 | struct extent_map **em_cached, |
9974090b | 2882 | struct bio **bio, int mirror_num, |
f1c77c55 | 2883 | unsigned long *bio_flags, unsigned int read_flags, |
005efedf | 2884 | u64 *prev_em_start) |
d1310b2e CM |
2885 | { |
2886 | struct inode *inode = page->mapping->host; | |
4eee4fa4 | 2887 | u64 start = page_offset(page); |
09cbfeaf | 2888 | u64 page_end = start + PAGE_SIZE - 1; |
d1310b2e CM |
2889 | u64 end; |
2890 | u64 cur = start; | |
2891 | u64 extent_offset; | |
2892 | u64 last_byte = i_size_read(inode); | |
2893 | u64 block_start; | |
2894 | u64 cur_end; | |
d1310b2e CM |
2895 | struct extent_map *em; |
2896 | struct block_device *bdev; | |
baf863b9 | 2897 | int ret = 0; |
d1310b2e | 2898 | int nr = 0; |
306e16ce | 2899 | size_t pg_offset = 0; |
d1310b2e | 2900 | size_t iosize; |
c8b97818 | 2901 | size_t disk_io_size; |
d1310b2e | 2902 | size_t blocksize = inode->i_sb->s_blocksize; |
7f042a83 | 2903 | unsigned long this_bio_flag = 0; |
d1310b2e CM |
2904 | |
2905 | set_page_extent_mapped(page); | |
2906 | ||
9974090b | 2907 | end = page_end; |
90a887c9 DM |
2908 | if (!PageUptodate(page)) { |
2909 | if (cleancache_get_page(page) == 0) { | |
2910 | BUG_ON(blocksize != PAGE_SIZE); | |
9974090b | 2911 | unlock_extent(tree, start, end); |
90a887c9 DM |
2912 | goto out; |
2913 | } | |
2914 | } | |
2915 | ||
09cbfeaf | 2916 | if (page->index == last_byte >> PAGE_SHIFT) { |
c8b97818 | 2917 | char *userpage; |
09cbfeaf | 2918 | size_t zero_offset = last_byte & (PAGE_SIZE - 1); |
c8b97818 CM |
2919 | |
2920 | if (zero_offset) { | |
09cbfeaf | 2921 | iosize = PAGE_SIZE - zero_offset; |
7ac687d9 | 2922 | userpage = kmap_atomic(page); |
c8b97818 CM |
2923 | memset(userpage + zero_offset, 0, iosize); |
2924 | flush_dcache_page(page); | |
7ac687d9 | 2925 | kunmap_atomic(userpage); |
c8b97818 CM |
2926 | } |
2927 | } | |
d1310b2e | 2928 | while (cur <= end) { |
005efedf | 2929 | bool force_bio_submit = false; |
6273b7f8 | 2930 | u64 offset; |
c8f2f24b | 2931 | |
d1310b2e CM |
2932 | if (cur >= last_byte) { |
2933 | char *userpage; | |
507903b8 AJ |
2934 | struct extent_state *cached = NULL; |
2935 | ||
09cbfeaf | 2936 | iosize = PAGE_SIZE - pg_offset; |
7ac687d9 | 2937 | userpage = kmap_atomic(page); |
306e16ce | 2938 | memset(userpage + pg_offset, 0, iosize); |
d1310b2e | 2939 | flush_dcache_page(page); |
7ac687d9 | 2940 | kunmap_atomic(userpage); |
d1310b2e | 2941 | set_extent_uptodate(tree, cur, cur + iosize - 1, |
507903b8 | 2942 | &cached, GFP_NOFS); |
7f042a83 FM |
2943 | unlock_extent_cached(tree, cur, |
2944 | cur + iosize - 1, | |
2945 | &cached, GFP_NOFS); | |
d1310b2e CM |
2946 | break; |
2947 | } | |
125bac01 MX |
2948 | em = __get_extent_map(inode, page, pg_offset, cur, |
2949 | end - cur + 1, get_extent, em_cached); | |
c704005d | 2950 | if (IS_ERR_OR_NULL(em)) { |
d1310b2e | 2951 | SetPageError(page); |
7f042a83 | 2952 | unlock_extent(tree, cur, end); |
d1310b2e CM |
2953 | break; |
2954 | } | |
d1310b2e CM |
2955 | extent_offset = cur - em->start; |
2956 | BUG_ON(extent_map_end(em) <= cur); | |
2957 | BUG_ON(end < cur); | |
2958 | ||
261507a0 | 2959 | if (test_bit(EXTENT_FLAG_COMPRESSED, &em->flags)) { |
4b384318 | 2960 | this_bio_flag |= EXTENT_BIO_COMPRESSED; |
261507a0 LZ |
2961 | extent_set_compress_type(&this_bio_flag, |
2962 | em->compress_type); | |
2963 | } | |
c8b97818 | 2964 | |
d1310b2e CM |
2965 | iosize = min(extent_map_end(em) - cur, end - cur + 1); |
2966 | cur_end = min(extent_map_end(em) - 1, end); | |
fda2832f | 2967 | iosize = ALIGN(iosize, blocksize); |
c8b97818 CM |
2968 | if (this_bio_flag & EXTENT_BIO_COMPRESSED) { |
2969 | disk_io_size = em->block_len; | |
6273b7f8 | 2970 | offset = em->block_start; |
c8b97818 | 2971 | } else { |
6273b7f8 | 2972 | offset = em->block_start + extent_offset; |
c8b97818 CM |
2973 | disk_io_size = iosize; |
2974 | } | |
d1310b2e CM |
2975 | bdev = em->bdev; |
2976 | block_start = em->block_start; | |
d899e052 YZ |
2977 | if (test_bit(EXTENT_FLAG_PREALLOC, &em->flags)) |
2978 | block_start = EXTENT_MAP_HOLE; | |
005efedf FM |
2979 | |
2980 | /* | |
2981 | * If we have a file range that points to a compressed extent | |
2982 | * and it's followed by a consecutive file range that points to | |
2983 | * to the same compressed extent (possibly with a different | |
2984 | * offset and/or length, so it either points to the whole extent | |
2985 | * or only part of it), we must make sure we do not submit a | |
2986 | * single bio to populate the pages for the 2 ranges because | |
2987 | * this makes the compressed extent read zero out the pages | |
2988 | * belonging to the 2nd range. Imagine the following scenario: | |
2989 | * | |
2990 | * File layout | |
2991 | * [0 - 8K] [8K - 24K] | |
2992 | * | | | |
2993 | * | | | |
2994 | * points to extent X, points to extent X, | |
2995 | * offset 4K, length of 8K offset 0, length 16K | |
2996 | * | |
2997 | * [extent X, compressed length = 4K uncompressed length = 16K] | |
2998 | * | |
2999 | * If the bio to read the compressed extent covers both ranges, | |
3000 | * it will decompress extent X into the pages belonging to the | |
3001 | * first range and then it will stop, zeroing out the remaining | |
3002 | * pages that belong to the other range that points to extent X. | |
3003 | * So here we make sure we submit 2 bios, one for the first | |
3004 | * range and another one for the third range. Both will target | |
3005 | * the same physical extent from disk, but we can't currently | |
3006 | * make the compressed bio endio callback populate the pages | |
3007 | * for both ranges because each compressed bio is tightly | |
3008 | * coupled with a single extent map, and each range can have | |
3009 | * an extent map with a different offset value relative to the | |
3010 | * uncompressed data of our extent and different lengths. This | |
3011 | * is a corner case so we prioritize correctness over | |
3012 | * non-optimal behavior (submitting 2 bios for the same extent). | |
3013 | */ | |
3014 | if (test_bit(EXTENT_FLAG_COMPRESSED, &em->flags) && | |
3015 | prev_em_start && *prev_em_start != (u64)-1 && | |
3016 | *prev_em_start != em->orig_start) | |
3017 | force_bio_submit = true; | |
3018 | ||
3019 | if (prev_em_start) | |
3020 | *prev_em_start = em->orig_start; | |
3021 | ||
d1310b2e CM |
3022 | free_extent_map(em); |
3023 | em = NULL; | |
3024 | ||
3025 | /* we've found a hole, just zero and go on */ | |
3026 | if (block_start == EXTENT_MAP_HOLE) { | |
3027 | char *userpage; | |
507903b8 AJ |
3028 | struct extent_state *cached = NULL; |
3029 | ||
7ac687d9 | 3030 | userpage = kmap_atomic(page); |
306e16ce | 3031 | memset(userpage + pg_offset, 0, iosize); |
d1310b2e | 3032 | flush_dcache_page(page); |
7ac687d9 | 3033 | kunmap_atomic(userpage); |
d1310b2e CM |
3034 | |
3035 | set_extent_uptodate(tree, cur, cur + iosize - 1, | |
507903b8 | 3036 | &cached, GFP_NOFS); |
7f042a83 FM |
3037 | unlock_extent_cached(tree, cur, |
3038 | cur + iosize - 1, | |
3039 | &cached, GFP_NOFS); | |
d1310b2e | 3040 | cur = cur + iosize; |
306e16ce | 3041 | pg_offset += iosize; |
d1310b2e CM |
3042 | continue; |
3043 | } | |
3044 | /* the get_extent function already copied into the page */ | |
9655d298 CM |
3045 | if (test_range_bit(tree, cur, cur_end, |
3046 | EXTENT_UPTODATE, 1, NULL)) { | |
a1b32a59 | 3047 | check_page_uptodate(tree, page); |
7f042a83 | 3048 | unlock_extent(tree, cur, cur + iosize - 1); |
d1310b2e | 3049 | cur = cur + iosize; |
306e16ce | 3050 | pg_offset += iosize; |
d1310b2e CM |
3051 | continue; |
3052 | } | |
70dec807 CM |
3053 | /* we have an inline extent but it didn't get marked up |
3054 | * to date. Error out | |
3055 | */ | |
3056 | if (block_start == EXTENT_MAP_INLINE) { | |
3057 | SetPageError(page); | |
7f042a83 | 3058 | unlock_extent(tree, cur, cur + iosize - 1); |
70dec807 | 3059 | cur = cur + iosize; |
306e16ce | 3060 | pg_offset += iosize; |
70dec807 CM |
3061 | continue; |
3062 | } | |
d1310b2e | 3063 | |
4b81ba48 | 3064 | ret = submit_extent_page(REQ_OP_READ | read_flags, tree, NULL, |
6273b7f8 DS |
3065 | page, offset, disk_io_size, |
3066 | pg_offset, bdev, bio, | |
c8b97818 CM |
3067 | end_bio_extent_readpage, mirror_num, |
3068 | *bio_flags, | |
005efedf FM |
3069 | this_bio_flag, |
3070 | force_bio_submit); | |
c8f2f24b JB |
3071 | if (!ret) { |
3072 | nr++; | |
3073 | *bio_flags = this_bio_flag; | |
3074 | } else { | |
d1310b2e | 3075 | SetPageError(page); |
7f042a83 | 3076 | unlock_extent(tree, cur, cur + iosize - 1); |
baf863b9 | 3077 | goto out; |
edd33c99 | 3078 | } |
d1310b2e | 3079 | cur = cur + iosize; |
306e16ce | 3080 | pg_offset += iosize; |
d1310b2e | 3081 | } |
90a887c9 | 3082 | out: |
d1310b2e CM |
3083 | if (!nr) { |
3084 | if (!PageError(page)) | |
3085 | SetPageUptodate(page); | |
3086 | unlock_page(page); | |
3087 | } | |
baf863b9 | 3088 | return ret; |
d1310b2e CM |
3089 | } |
3090 | ||
9974090b MX |
3091 | static inline void __do_contiguous_readpages(struct extent_io_tree *tree, |
3092 | struct page *pages[], int nr_pages, | |
3093 | u64 start, u64 end, | |
125bac01 | 3094 | struct extent_map **em_cached, |
d3fac6ba | 3095 | struct bio **bio, |
1f7ad75b | 3096 | unsigned long *bio_flags, |
808f80b4 | 3097 | u64 *prev_em_start) |
9974090b MX |
3098 | { |
3099 | struct inode *inode; | |
3100 | struct btrfs_ordered_extent *ordered; | |
3101 | int index; | |
3102 | ||
3103 | inode = pages[0]->mapping->host; | |
3104 | while (1) { | |
3105 | lock_extent(tree, start, end); | |
a776c6fa | 3106 | ordered = btrfs_lookup_ordered_range(BTRFS_I(inode), start, |
9974090b MX |
3107 | end - start + 1); |
3108 | if (!ordered) | |
3109 | break; | |
3110 | unlock_extent(tree, start, end); | |
3111 | btrfs_start_ordered_extent(inode, ordered, 1); | |
3112 | btrfs_put_ordered_extent(ordered); | |
3113 | } | |
3114 | ||
3115 | for (index = 0; index < nr_pages; index++) { | |
4ef77695 DS |
3116 | __do_readpage(tree, pages[index], btrfs_get_extent, em_cached, |
3117 | bio, 0, bio_flags, 0, prev_em_start); | |
09cbfeaf | 3118 | put_page(pages[index]); |
9974090b MX |
3119 | } |
3120 | } | |
3121 | ||
3122 | static void __extent_readpages(struct extent_io_tree *tree, | |
3123 | struct page *pages[], | |
e4d17ef5 | 3124 | int nr_pages, |
125bac01 | 3125 | struct extent_map **em_cached, |
d3fac6ba | 3126 | struct bio **bio, unsigned long *bio_flags, |
808f80b4 | 3127 | u64 *prev_em_start) |
9974090b | 3128 | { |
35a3621b | 3129 | u64 start = 0; |
9974090b MX |
3130 | u64 end = 0; |
3131 | u64 page_start; | |
3132 | int index; | |
35a3621b | 3133 | int first_index = 0; |
9974090b MX |
3134 | |
3135 | for (index = 0; index < nr_pages; index++) { | |
3136 | page_start = page_offset(pages[index]); | |
3137 | if (!end) { | |
3138 | start = page_start; | |
09cbfeaf | 3139 | end = start + PAGE_SIZE - 1; |
9974090b MX |
3140 | first_index = index; |
3141 | } else if (end + 1 == page_start) { | |
09cbfeaf | 3142 | end += PAGE_SIZE; |
9974090b MX |
3143 | } else { |
3144 | __do_contiguous_readpages(tree, &pages[first_index], | |
3145 | index - first_index, start, | |
4ef77695 | 3146 | end, em_cached, |
d3fac6ba | 3147 | bio, bio_flags, |
1f7ad75b | 3148 | prev_em_start); |
9974090b | 3149 | start = page_start; |
09cbfeaf | 3150 | end = start + PAGE_SIZE - 1; |
9974090b MX |
3151 | first_index = index; |
3152 | } | |
3153 | } | |
3154 | ||
3155 | if (end) | |
3156 | __do_contiguous_readpages(tree, &pages[first_index], | |
3157 | index - first_index, start, | |
4ef77695 | 3158 | end, em_cached, bio, |
d3fac6ba | 3159 | bio_flags, prev_em_start); |
9974090b MX |
3160 | } |
3161 | ||
3162 | static int __extent_read_full_page(struct extent_io_tree *tree, | |
3163 | struct page *page, | |
3164 | get_extent_t *get_extent, | |
3165 | struct bio **bio, int mirror_num, | |
f1c77c55 DS |
3166 | unsigned long *bio_flags, |
3167 | unsigned int read_flags) | |
9974090b MX |
3168 | { |
3169 | struct inode *inode = page->mapping->host; | |
3170 | struct btrfs_ordered_extent *ordered; | |
3171 | u64 start = page_offset(page); | |
09cbfeaf | 3172 | u64 end = start + PAGE_SIZE - 1; |
9974090b MX |
3173 | int ret; |
3174 | ||
3175 | while (1) { | |
3176 | lock_extent(tree, start, end); | |
a776c6fa | 3177 | ordered = btrfs_lookup_ordered_range(BTRFS_I(inode), start, |
09cbfeaf | 3178 | PAGE_SIZE); |
9974090b MX |
3179 | if (!ordered) |
3180 | break; | |
3181 | unlock_extent(tree, start, end); | |
3182 | btrfs_start_ordered_extent(inode, ordered, 1); | |
3183 | btrfs_put_ordered_extent(ordered); | |
3184 | } | |
3185 | ||
125bac01 | 3186 | ret = __do_readpage(tree, page, get_extent, NULL, bio, mirror_num, |
1f7ad75b | 3187 | bio_flags, read_flags, NULL); |
9974090b MX |
3188 | return ret; |
3189 | } | |
3190 | ||
d1310b2e | 3191 | int extent_read_full_page(struct extent_io_tree *tree, struct page *page, |
8ddc7d9c | 3192 | get_extent_t *get_extent, int mirror_num) |
d1310b2e CM |
3193 | { |
3194 | struct bio *bio = NULL; | |
c8b97818 | 3195 | unsigned long bio_flags = 0; |
d1310b2e CM |
3196 | int ret; |
3197 | ||
8ddc7d9c | 3198 | ret = __extent_read_full_page(tree, page, get_extent, &bio, mirror_num, |
1f7ad75b | 3199 | &bio_flags, 0); |
d1310b2e | 3200 | if (bio) |
1f7ad75b | 3201 | ret = submit_one_bio(bio, mirror_num, bio_flags); |
d1310b2e CM |
3202 | return ret; |
3203 | } | |
d1310b2e | 3204 | |
3d4b9496 | 3205 | static void update_nr_written(struct writeback_control *wbc, |
a9132667 | 3206 | unsigned long nr_written) |
11c8349b CM |
3207 | { |
3208 | wbc->nr_to_write -= nr_written; | |
11c8349b CM |
3209 | } |
3210 | ||
d1310b2e | 3211 | /* |
40f76580 CM |
3212 | * helper for __extent_writepage, doing all of the delayed allocation setup. |
3213 | * | |
3214 | * This returns 1 if our fill_delalloc function did all the work required | |
3215 | * to write the page (copy into inline extent). In this case the IO has | |
3216 | * been started and the page is already unlocked. | |
3217 | * | |
3218 | * This returns 0 if all went well (page still locked) | |
3219 | * This returns < 0 if there were errors (page still locked) | |
d1310b2e | 3220 | */ |
40f76580 CM |
3221 | static noinline_for_stack int writepage_delalloc(struct inode *inode, |
3222 | struct page *page, struct writeback_control *wbc, | |
3223 | struct extent_page_data *epd, | |
3224 | u64 delalloc_start, | |
3225 | unsigned long *nr_written) | |
3226 | { | |
3227 | struct extent_io_tree *tree = epd->tree; | |
09cbfeaf | 3228 | u64 page_end = delalloc_start + PAGE_SIZE - 1; |
40f76580 CM |
3229 | u64 nr_delalloc; |
3230 | u64 delalloc_to_write = 0; | |
3231 | u64 delalloc_end = 0; | |
3232 | int ret; | |
3233 | int page_started = 0; | |
3234 | ||
3235 | if (epd->extent_locked || !tree->ops || !tree->ops->fill_delalloc) | |
3236 | return 0; | |
3237 | ||
3238 | while (delalloc_end < page_end) { | |
3239 | nr_delalloc = find_lock_delalloc_range(inode, tree, | |
3240 | page, | |
3241 | &delalloc_start, | |
3242 | &delalloc_end, | |
dcab6a3b | 3243 | BTRFS_MAX_EXTENT_SIZE); |
40f76580 CM |
3244 | if (nr_delalloc == 0) { |
3245 | delalloc_start = delalloc_end + 1; | |
3246 | continue; | |
3247 | } | |
3248 | ret = tree->ops->fill_delalloc(inode, page, | |
3249 | delalloc_start, | |
3250 | delalloc_end, | |
3251 | &page_started, | |
f82b7359 | 3252 | nr_written, wbc); |
40f76580 CM |
3253 | /* File system has been set read-only */ |
3254 | if (ret) { | |
3255 | SetPageError(page); | |
3256 | /* fill_delalloc should be return < 0 for error | |
3257 | * but just in case, we use > 0 here meaning the | |
3258 | * IO is started, so we don't want to return > 0 | |
3259 | * unless things are going well. | |
3260 | */ | |
3261 | ret = ret < 0 ? ret : -EIO; | |
3262 | goto done; | |
3263 | } | |
3264 | /* | |
ea1754a0 KS |
3265 | * delalloc_end is already one less than the total length, so |
3266 | * we don't subtract one from PAGE_SIZE | |
40f76580 CM |
3267 | */ |
3268 | delalloc_to_write += (delalloc_end - delalloc_start + | |
ea1754a0 | 3269 | PAGE_SIZE) >> PAGE_SHIFT; |
40f76580 CM |
3270 | delalloc_start = delalloc_end + 1; |
3271 | } | |
3272 | if (wbc->nr_to_write < delalloc_to_write) { | |
3273 | int thresh = 8192; | |
3274 | ||
3275 | if (delalloc_to_write < thresh * 2) | |
3276 | thresh = delalloc_to_write; | |
3277 | wbc->nr_to_write = min_t(u64, delalloc_to_write, | |
3278 | thresh); | |
3279 | } | |
3280 | ||
3281 | /* did the fill delalloc function already unlock and start | |
3282 | * the IO? | |
3283 | */ | |
3284 | if (page_started) { | |
3285 | /* | |
3286 | * we've unlocked the page, so we can't update | |
3287 | * the mapping's writeback index, just update | |
3288 | * nr_to_write. | |
3289 | */ | |
3290 | wbc->nr_to_write -= *nr_written; | |
3291 | return 1; | |
3292 | } | |
3293 | ||
3294 | ret = 0; | |
3295 | ||
3296 | done: | |
3297 | return ret; | |
3298 | } | |
3299 | ||
3300 | /* | |
3301 | * helper for __extent_writepage. This calls the writepage start hooks, | |
3302 | * and does the loop to map the page into extents and bios. | |
3303 | * | |
3304 | * We return 1 if the IO is started and the page is unlocked, | |
3305 | * 0 if all went well (page still locked) | |
3306 | * < 0 if there were errors (page still locked) | |
3307 | */ | |
3308 | static noinline_for_stack int __extent_writepage_io(struct inode *inode, | |
3309 | struct page *page, | |
3310 | struct writeback_control *wbc, | |
3311 | struct extent_page_data *epd, | |
3312 | loff_t i_size, | |
3313 | unsigned long nr_written, | |
f1c77c55 | 3314 | unsigned int write_flags, int *nr_ret) |
d1310b2e | 3315 | { |
d1310b2e | 3316 | struct extent_io_tree *tree = epd->tree; |
4eee4fa4 | 3317 | u64 start = page_offset(page); |
09cbfeaf | 3318 | u64 page_end = start + PAGE_SIZE - 1; |
d1310b2e CM |
3319 | u64 end; |
3320 | u64 cur = start; | |
3321 | u64 extent_offset; | |
d1310b2e CM |
3322 | u64 block_start; |
3323 | u64 iosize; | |
d1310b2e CM |
3324 | struct extent_map *em; |
3325 | struct block_device *bdev; | |
7f3c74fb | 3326 | size_t pg_offset = 0; |
d1310b2e | 3327 | size_t blocksize; |
40f76580 CM |
3328 | int ret = 0; |
3329 | int nr = 0; | |
3330 | bool compressed; | |
c8b97818 | 3331 | |
247e743c | 3332 | if (tree->ops && tree->ops->writepage_start_hook) { |
c8b97818 CM |
3333 | ret = tree->ops->writepage_start_hook(page, start, |
3334 | page_end); | |
87826df0 JM |
3335 | if (ret) { |
3336 | /* Fixup worker will requeue */ | |
3337 | if (ret == -EBUSY) | |
3338 | wbc->pages_skipped++; | |
3339 | else | |
3340 | redirty_page_for_writepage(wbc, page); | |
40f76580 | 3341 | |
3d4b9496 | 3342 | update_nr_written(wbc, nr_written); |
247e743c | 3343 | unlock_page(page); |
bcf93489 | 3344 | return 1; |
247e743c CM |
3345 | } |
3346 | } | |
3347 | ||
11c8349b CM |
3348 | /* |
3349 | * we don't want to touch the inode after unlocking the page, | |
3350 | * so we update the mapping writeback index now | |
3351 | */ | |
3d4b9496 | 3352 | update_nr_written(wbc, nr_written + 1); |
771ed689 | 3353 | |
d1310b2e | 3354 | end = page_end; |
40f76580 | 3355 | if (i_size <= start) { |
e6dcd2dc CM |
3356 | if (tree->ops && tree->ops->writepage_end_io_hook) |
3357 | tree->ops->writepage_end_io_hook(page, start, | |
3358 | page_end, NULL, 1); | |
d1310b2e CM |
3359 | goto done; |
3360 | } | |
3361 | ||
d1310b2e CM |
3362 | blocksize = inode->i_sb->s_blocksize; |
3363 | ||
3364 | while (cur <= end) { | |
40f76580 | 3365 | u64 em_end; |
6273b7f8 | 3366 | u64 offset; |
58409edd | 3367 | |
40f76580 | 3368 | if (cur >= i_size) { |
e6dcd2dc CM |
3369 | if (tree->ops && tree->ops->writepage_end_io_hook) |
3370 | tree->ops->writepage_end_io_hook(page, cur, | |
3371 | page_end, NULL, 1); | |
d1310b2e CM |
3372 | break; |
3373 | } | |
3c98c62f | 3374 | em = btrfs_get_extent(BTRFS_I(inode), page, pg_offset, cur, |
d1310b2e | 3375 | end - cur + 1, 1); |
c704005d | 3376 | if (IS_ERR_OR_NULL(em)) { |
d1310b2e | 3377 | SetPageError(page); |
61391d56 | 3378 | ret = PTR_ERR_OR_ZERO(em); |
d1310b2e CM |
3379 | break; |
3380 | } | |
3381 | ||
3382 | extent_offset = cur - em->start; | |
40f76580 CM |
3383 | em_end = extent_map_end(em); |
3384 | BUG_ON(em_end <= cur); | |
d1310b2e | 3385 | BUG_ON(end < cur); |
40f76580 | 3386 | iosize = min(em_end - cur, end - cur + 1); |
fda2832f | 3387 | iosize = ALIGN(iosize, blocksize); |
6273b7f8 | 3388 | offset = em->block_start + extent_offset; |
d1310b2e CM |
3389 | bdev = em->bdev; |
3390 | block_start = em->block_start; | |
c8b97818 | 3391 | compressed = test_bit(EXTENT_FLAG_COMPRESSED, &em->flags); |
d1310b2e CM |
3392 | free_extent_map(em); |
3393 | em = NULL; | |
3394 | ||
c8b97818 CM |
3395 | /* |
3396 | * compressed and inline extents are written through other | |
3397 | * paths in the FS | |
3398 | */ | |
3399 | if (compressed || block_start == EXTENT_MAP_HOLE || | |
d1310b2e | 3400 | block_start == EXTENT_MAP_INLINE) { |
c8b97818 CM |
3401 | /* |
3402 | * end_io notification does not happen here for | |
3403 | * compressed extents | |
3404 | */ | |
3405 | if (!compressed && tree->ops && | |
3406 | tree->ops->writepage_end_io_hook) | |
e6dcd2dc CM |
3407 | tree->ops->writepage_end_io_hook(page, cur, |
3408 | cur + iosize - 1, | |
3409 | NULL, 1); | |
c8b97818 CM |
3410 | else if (compressed) { |
3411 | /* we don't want to end_page_writeback on | |
3412 | * a compressed extent. this happens | |
3413 | * elsewhere | |
3414 | */ | |
3415 | nr++; | |
3416 | } | |
3417 | ||
3418 | cur += iosize; | |
7f3c74fb | 3419 | pg_offset += iosize; |
d1310b2e CM |
3420 | continue; |
3421 | } | |
c8b97818 | 3422 | |
58409edd DS |
3423 | set_range_writeback(tree, cur, cur + iosize - 1); |
3424 | if (!PageWriteback(page)) { | |
3425 | btrfs_err(BTRFS_I(inode)->root->fs_info, | |
3426 | "page %lu not writeback, cur %llu end %llu", | |
3427 | page->index, cur, end); | |
d1310b2e | 3428 | } |
7f3c74fb | 3429 | |
4b81ba48 | 3430 | ret = submit_extent_page(REQ_OP_WRITE | write_flags, tree, wbc, |
6273b7f8 | 3431 | page, offset, iosize, pg_offset, |
c2df8bb4 | 3432 | bdev, &epd->bio, |
58409edd DS |
3433 | end_bio_extent_writepage, |
3434 | 0, 0, 0, false); | |
fe01aa65 | 3435 | if (ret) { |
58409edd | 3436 | SetPageError(page); |
fe01aa65 TK |
3437 | if (PageWriteback(page)) |
3438 | end_page_writeback(page); | |
3439 | } | |
d1310b2e | 3440 | |
d1310b2e | 3441 | cur = cur + iosize; |
7f3c74fb | 3442 | pg_offset += iosize; |
d1310b2e CM |
3443 | nr++; |
3444 | } | |
40f76580 CM |
3445 | done: |
3446 | *nr_ret = nr; | |
40f76580 CM |
3447 | return ret; |
3448 | } | |
3449 | ||
3450 | /* | |
3451 | * the writepage semantics are similar to regular writepage. extent | |
3452 | * records are inserted to lock ranges in the tree, and as dirty areas | |
3453 | * are found, they are marked writeback. Then the lock bits are removed | |
3454 | * and the end_io handler clears the writeback ranges | |
3455 | */ | |
3456 | static int __extent_writepage(struct page *page, struct writeback_control *wbc, | |
3457 | void *data) | |
3458 | { | |
3459 | struct inode *inode = page->mapping->host; | |
3460 | struct extent_page_data *epd = data; | |
3461 | u64 start = page_offset(page); | |
09cbfeaf | 3462 | u64 page_end = start + PAGE_SIZE - 1; |
40f76580 CM |
3463 | int ret; |
3464 | int nr = 0; | |
3465 | size_t pg_offset = 0; | |
3466 | loff_t i_size = i_size_read(inode); | |
09cbfeaf | 3467 | unsigned long end_index = i_size >> PAGE_SHIFT; |
f1c77c55 | 3468 | unsigned int write_flags = 0; |
40f76580 CM |
3469 | unsigned long nr_written = 0; |
3470 | ||
ff40adf7 | 3471 | write_flags = wbc_to_write_flags(wbc); |
40f76580 CM |
3472 | |
3473 | trace___extent_writepage(page, inode, wbc); | |
3474 | ||
3475 | WARN_ON(!PageLocked(page)); | |
3476 | ||
3477 | ClearPageError(page); | |
3478 | ||
09cbfeaf | 3479 | pg_offset = i_size & (PAGE_SIZE - 1); |
40f76580 CM |
3480 | if (page->index > end_index || |
3481 | (page->index == end_index && !pg_offset)) { | |
09cbfeaf | 3482 | page->mapping->a_ops->invalidatepage(page, 0, PAGE_SIZE); |
40f76580 CM |
3483 | unlock_page(page); |
3484 | return 0; | |
3485 | } | |
3486 | ||
3487 | if (page->index == end_index) { | |
3488 | char *userpage; | |
3489 | ||
3490 | userpage = kmap_atomic(page); | |
3491 | memset(userpage + pg_offset, 0, | |
09cbfeaf | 3492 | PAGE_SIZE - pg_offset); |
40f76580 CM |
3493 | kunmap_atomic(userpage); |
3494 | flush_dcache_page(page); | |
3495 | } | |
3496 | ||
3497 | pg_offset = 0; | |
3498 | ||
3499 | set_page_extent_mapped(page); | |
3500 | ||
3501 | ret = writepage_delalloc(inode, page, wbc, epd, start, &nr_written); | |
3502 | if (ret == 1) | |
3503 | goto done_unlocked; | |
3504 | if (ret) | |
3505 | goto done; | |
3506 | ||
3507 | ret = __extent_writepage_io(inode, page, wbc, epd, | |
3508 | i_size, nr_written, write_flags, &nr); | |
3509 | if (ret == 1) | |
3510 | goto done_unlocked; | |
3511 | ||
d1310b2e CM |
3512 | done: |
3513 | if (nr == 0) { | |
3514 | /* make sure the mapping tag for page dirty gets cleared */ | |
3515 | set_page_writeback(page); | |
3516 | end_page_writeback(page); | |
3517 | } | |
61391d56 FM |
3518 | if (PageError(page)) { |
3519 | ret = ret < 0 ? ret : -EIO; | |
3520 | end_extent_writepage(page, ret, start, page_end); | |
3521 | } | |
d1310b2e | 3522 | unlock_page(page); |
40f76580 | 3523 | return ret; |
771ed689 | 3524 | |
11c8349b | 3525 | done_unlocked: |
d1310b2e CM |
3526 | return 0; |
3527 | } | |
3528 | ||
fd8b2b61 | 3529 | void wait_on_extent_buffer_writeback(struct extent_buffer *eb) |
0b32f4bb | 3530 | { |
74316201 N |
3531 | wait_on_bit_io(&eb->bflags, EXTENT_BUFFER_WRITEBACK, |
3532 | TASK_UNINTERRUPTIBLE); | |
0b32f4bb JB |
3533 | } |
3534 | ||
0e378df1 CM |
3535 | static noinline_for_stack int |
3536 | lock_extent_buffer_for_io(struct extent_buffer *eb, | |
3537 | struct btrfs_fs_info *fs_info, | |
3538 | struct extent_page_data *epd) | |
0b32f4bb JB |
3539 | { |
3540 | unsigned long i, num_pages; | |
3541 | int flush = 0; | |
3542 | int ret = 0; | |
3543 | ||
3544 | if (!btrfs_try_tree_write_lock(eb)) { | |
3545 | flush = 1; | |
3546 | flush_write_bio(epd); | |
3547 | btrfs_tree_lock(eb); | |
3548 | } | |
3549 | ||
3550 | if (test_bit(EXTENT_BUFFER_WRITEBACK, &eb->bflags)) { | |
3551 | btrfs_tree_unlock(eb); | |
3552 | if (!epd->sync_io) | |
3553 | return 0; | |
3554 | if (!flush) { | |
3555 | flush_write_bio(epd); | |
3556 | flush = 1; | |
3557 | } | |
a098d8e8 CM |
3558 | while (1) { |
3559 | wait_on_extent_buffer_writeback(eb); | |
3560 | btrfs_tree_lock(eb); | |
3561 | if (!test_bit(EXTENT_BUFFER_WRITEBACK, &eb->bflags)) | |
3562 | break; | |
0b32f4bb | 3563 | btrfs_tree_unlock(eb); |
0b32f4bb JB |
3564 | } |
3565 | } | |
3566 | ||
51561ffe JB |
3567 | /* |
3568 | * We need to do this to prevent races in people who check if the eb is | |
3569 | * under IO since we can end up having no IO bits set for a short period | |
3570 | * of time. | |
3571 | */ | |
3572 | spin_lock(&eb->refs_lock); | |
0b32f4bb JB |
3573 | if (test_and_clear_bit(EXTENT_BUFFER_DIRTY, &eb->bflags)) { |
3574 | set_bit(EXTENT_BUFFER_WRITEBACK, &eb->bflags); | |
51561ffe | 3575 | spin_unlock(&eb->refs_lock); |
0b32f4bb | 3576 | btrfs_set_header_flag(eb, BTRFS_HEADER_FLAG_WRITTEN); |
104b4e51 NB |
3577 | percpu_counter_add_batch(&fs_info->dirty_metadata_bytes, |
3578 | -eb->len, | |
3579 | fs_info->dirty_metadata_batch); | |
0b32f4bb | 3580 | ret = 1; |
51561ffe JB |
3581 | } else { |
3582 | spin_unlock(&eb->refs_lock); | |
0b32f4bb JB |
3583 | } |
3584 | ||
3585 | btrfs_tree_unlock(eb); | |
3586 | ||
3587 | if (!ret) | |
3588 | return ret; | |
3589 | ||
3590 | num_pages = num_extent_pages(eb->start, eb->len); | |
3591 | for (i = 0; i < num_pages; i++) { | |
fb85fc9a | 3592 | struct page *p = eb->pages[i]; |
0b32f4bb JB |
3593 | |
3594 | if (!trylock_page(p)) { | |
3595 | if (!flush) { | |
3596 | flush_write_bio(epd); | |
3597 | flush = 1; | |
3598 | } | |
3599 | lock_page(p); | |
3600 | } | |
3601 | } | |
3602 | ||
3603 | return ret; | |
3604 | } | |
3605 | ||
3606 | static void end_extent_buffer_writeback(struct extent_buffer *eb) | |
3607 | { | |
3608 | clear_bit(EXTENT_BUFFER_WRITEBACK, &eb->bflags); | |
4e857c58 | 3609 | smp_mb__after_atomic(); |
0b32f4bb JB |
3610 | wake_up_bit(&eb->bflags, EXTENT_BUFFER_WRITEBACK); |
3611 | } | |
3612 | ||
656f30db FM |
3613 | static void set_btree_ioerr(struct page *page) |
3614 | { | |
3615 | struct extent_buffer *eb = (struct extent_buffer *)page->private; | |
656f30db FM |
3616 | |
3617 | SetPageError(page); | |
3618 | if (test_and_set_bit(EXTENT_BUFFER_WRITE_ERR, &eb->bflags)) | |
3619 | return; | |
3620 | ||
3621 | /* | |
3622 | * If writeback for a btree extent that doesn't belong to a log tree | |
3623 | * failed, increment the counter transaction->eb_write_errors. | |
3624 | * We do this because while the transaction is running and before it's | |
3625 | * committing (when we call filemap_fdata[write|wait]_range against | |
3626 | * the btree inode), we might have | |
3627 | * btree_inode->i_mapping->a_ops->writepages() called by the VM - if it | |
3628 | * returns an error or an error happens during writeback, when we're | |
3629 | * committing the transaction we wouldn't know about it, since the pages | |
3630 | * can be no longer dirty nor marked anymore for writeback (if a | |
3631 | * subsequent modification to the extent buffer didn't happen before the | |
3632 | * transaction commit), which makes filemap_fdata[write|wait]_range not | |
3633 | * able to find the pages tagged with SetPageError at transaction | |
3634 | * commit time. So if this happens we must abort the transaction, | |
3635 | * otherwise we commit a super block with btree roots that point to | |
3636 | * btree nodes/leafs whose content on disk is invalid - either garbage | |
3637 | * or the content of some node/leaf from a past generation that got | |
3638 | * cowed or deleted and is no longer valid. | |
3639 | * | |
3640 | * Note: setting AS_EIO/AS_ENOSPC in the btree inode's i_mapping would | |
3641 | * not be enough - we need to distinguish between log tree extents vs | |
3642 | * non-log tree extents, and the next filemap_fdatawait_range() call | |
3643 | * will catch and clear such errors in the mapping - and that call might | |
3644 | * be from a log sync and not from a transaction commit. Also, checking | |
3645 | * for the eb flag EXTENT_BUFFER_WRITE_ERR at transaction commit time is | |
3646 | * not done and would not be reliable - the eb might have been released | |
3647 | * from memory and reading it back again means that flag would not be | |
3648 | * set (since it's a runtime flag, not persisted on disk). | |
3649 | * | |
3650 | * Using the flags below in the btree inode also makes us achieve the | |
3651 | * goal of AS_EIO/AS_ENOSPC when writepages() returns success, started | |
3652 | * writeback for all dirty pages and before filemap_fdatawait_range() | |
3653 | * is called, the writeback for all dirty pages had already finished | |
3654 | * with errors - because we were not using AS_EIO/AS_ENOSPC, | |
3655 | * filemap_fdatawait_range() would return success, as it could not know | |
3656 | * that writeback errors happened (the pages were no longer tagged for | |
3657 | * writeback). | |
3658 | */ | |
3659 | switch (eb->log_index) { | |
3660 | case -1: | |
afcdd129 | 3661 | set_bit(BTRFS_FS_BTREE_ERR, &eb->fs_info->flags); |
656f30db FM |
3662 | break; |
3663 | case 0: | |
afcdd129 | 3664 | set_bit(BTRFS_FS_LOG1_ERR, &eb->fs_info->flags); |
656f30db FM |
3665 | break; |
3666 | case 1: | |
afcdd129 | 3667 | set_bit(BTRFS_FS_LOG2_ERR, &eb->fs_info->flags); |
656f30db FM |
3668 | break; |
3669 | default: | |
3670 | BUG(); /* unexpected, logic error */ | |
3671 | } | |
3672 | } | |
3673 | ||
4246a0b6 | 3674 | static void end_bio_extent_buffer_writepage(struct bio *bio) |
0b32f4bb | 3675 | { |
2c30c71b | 3676 | struct bio_vec *bvec; |
0b32f4bb | 3677 | struct extent_buffer *eb; |
2c30c71b | 3678 | int i, done; |
0b32f4bb | 3679 | |
c09abff8 | 3680 | ASSERT(!bio_flagged(bio, BIO_CLONED)); |
2c30c71b | 3681 | bio_for_each_segment_all(bvec, bio, i) { |
0b32f4bb JB |
3682 | struct page *page = bvec->bv_page; |
3683 | ||
0b32f4bb JB |
3684 | eb = (struct extent_buffer *)page->private; |
3685 | BUG_ON(!eb); | |
3686 | done = atomic_dec_and_test(&eb->io_pages); | |
3687 | ||
4e4cbee9 | 3688 | if (bio->bi_status || |
4246a0b6 | 3689 | test_bit(EXTENT_BUFFER_WRITE_ERR, &eb->bflags)) { |
0b32f4bb | 3690 | ClearPageUptodate(page); |
656f30db | 3691 | set_btree_ioerr(page); |
0b32f4bb JB |
3692 | } |
3693 | ||
3694 | end_page_writeback(page); | |
3695 | ||
3696 | if (!done) | |
3697 | continue; | |
3698 | ||
3699 | end_extent_buffer_writeback(eb); | |
2c30c71b | 3700 | } |
0b32f4bb JB |
3701 | |
3702 | bio_put(bio); | |
0b32f4bb JB |
3703 | } |
3704 | ||
0e378df1 | 3705 | static noinline_for_stack int write_one_eb(struct extent_buffer *eb, |
0b32f4bb JB |
3706 | struct btrfs_fs_info *fs_info, |
3707 | struct writeback_control *wbc, | |
3708 | struct extent_page_data *epd) | |
3709 | { | |
3710 | struct block_device *bdev = fs_info->fs_devices->latest_bdev; | |
f28491e0 | 3711 | struct extent_io_tree *tree = &BTRFS_I(fs_info->btree_inode)->io_tree; |
0b32f4bb | 3712 | u64 offset = eb->start; |
851cd173 | 3713 | u32 nritems; |
0b32f4bb | 3714 | unsigned long i, num_pages; |
851cd173 | 3715 | unsigned long start, end; |
ff40adf7 | 3716 | unsigned int write_flags = wbc_to_write_flags(wbc) | REQ_META; |
d7dbe9e7 | 3717 | int ret = 0; |
0b32f4bb | 3718 | |
656f30db | 3719 | clear_bit(EXTENT_BUFFER_WRITE_ERR, &eb->bflags); |
0b32f4bb JB |
3720 | num_pages = num_extent_pages(eb->start, eb->len); |
3721 | atomic_set(&eb->io_pages, num_pages); | |
de0022b9 | 3722 | |
851cd173 LB |
3723 | /* set btree blocks beyond nritems with 0 to avoid stale content. */ |
3724 | nritems = btrfs_header_nritems(eb); | |
3eb548ee | 3725 | if (btrfs_header_level(eb) > 0) { |
3eb548ee LB |
3726 | end = btrfs_node_key_ptr_offset(nritems); |
3727 | ||
b159fa28 | 3728 | memzero_extent_buffer(eb, end, eb->len - end); |
851cd173 LB |
3729 | } else { |
3730 | /* | |
3731 | * leaf: | |
3732 | * header 0 1 2 .. N ... data_N .. data_2 data_1 data_0 | |
3733 | */ | |
3734 | start = btrfs_item_nr_offset(nritems); | |
3d9ec8c4 | 3735 | end = BTRFS_LEAF_DATA_OFFSET + leaf_data_end(fs_info, eb); |
b159fa28 | 3736 | memzero_extent_buffer(eb, start, end - start); |
3eb548ee LB |
3737 | } |
3738 | ||
0b32f4bb | 3739 | for (i = 0; i < num_pages; i++) { |
fb85fc9a | 3740 | struct page *p = eb->pages[i]; |
0b32f4bb JB |
3741 | |
3742 | clear_page_dirty_for_io(p); | |
3743 | set_page_writeback(p); | |
4b81ba48 | 3744 | ret = submit_extent_page(REQ_OP_WRITE | write_flags, tree, wbc, |
6273b7f8 | 3745 | p, offset, PAGE_SIZE, 0, bdev, |
c2df8bb4 | 3746 | &epd->bio, |
1f7ad75b | 3747 | end_bio_extent_buffer_writepage, |
18fdc679 | 3748 | 0, 0, 0, false); |
0b32f4bb | 3749 | if (ret) { |
656f30db | 3750 | set_btree_ioerr(p); |
fe01aa65 TK |
3751 | if (PageWriteback(p)) |
3752 | end_page_writeback(p); | |
0b32f4bb JB |
3753 | if (atomic_sub_and_test(num_pages - i, &eb->io_pages)) |
3754 | end_extent_buffer_writeback(eb); | |
3755 | ret = -EIO; | |
3756 | break; | |
3757 | } | |
09cbfeaf | 3758 | offset += PAGE_SIZE; |
3d4b9496 | 3759 | update_nr_written(wbc, 1); |
0b32f4bb JB |
3760 | unlock_page(p); |
3761 | } | |
3762 | ||
3763 | if (unlikely(ret)) { | |
3764 | for (; i < num_pages; i++) { | |
bbf65cf0 | 3765 | struct page *p = eb->pages[i]; |
81465028 | 3766 | clear_page_dirty_for_io(p); |
0b32f4bb JB |
3767 | unlock_page(p); |
3768 | } | |
3769 | } | |
3770 | ||
3771 | return ret; | |
3772 | } | |
3773 | ||
3774 | int btree_write_cache_pages(struct address_space *mapping, | |
3775 | struct writeback_control *wbc) | |
3776 | { | |
3777 | struct extent_io_tree *tree = &BTRFS_I(mapping->host)->io_tree; | |
3778 | struct btrfs_fs_info *fs_info = BTRFS_I(mapping->host)->root->fs_info; | |
3779 | struct extent_buffer *eb, *prev_eb = NULL; | |
3780 | struct extent_page_data epd = { | |
3781 | .bio = NULL, | |
3782 | .tree = tree, | |
3783 | .extent_locked = 0, | |
3784 | .sync_io = wbc->sync_mode == WB_SYNC_ALL, | |
3785 | }; | |
3786 | int ret = 0; | |
3787 | int done = 0; | |
3788 | int nr_to_write_done = 0; | |
3789 | struct pagevec pvec; | |
3790 | int nr_pages; | |
3791 | pgoff_t index; | |
3792 | pgoff_t end; /* Inclusive */ | |
3793 | int scanned = 0; | |
3794 | int tag; | |
3795 | ||
86679820 | 3796 | pagevec_init(&pvec); |
0b32f4bb JB |
3797 | if (wbc->range_cyclic) { |
3798 | index = mapping->writeback_index; /* Start from prev offset */ | |
3799 | end = -1; | |
3800 | } else { | |
09cbfeaf KS |
3801 | index = wbc->range_start >> PAGE_SHIFT; |
3802 | end = wbc->range_end >> PAGE_SHIFT; | |
0b32f4bb JB |
3803 | scanned = 1; |
3804 | } | |
3805 | if (wbc->sync_mode == WB_SYNC_ALL) | |
3806 | tag = PAGECACHE_TAG_TOWRITE; | |
3807 | else | |
3808 | tag = PAGECACHE_TAG_DIRTY; | |
3809 | retry: | |
3810 | if (wbc->sync_mode == WB_SYNC_ALL) | |
3811 | tag_pages_for_writeback(mapping, index, end); | |
3812 | while (!done && !nr_to_write_done && (index <= end) && | |
4006f437 | 3813 | (nr_pages = pagevec_lookup_range_tag(&pvec, mapping, &index, end, |
67fd707f | 3814 | tag))) { |
0b32f4bb JB |
3815 | unsigned i; |
3816 | ||
3817 | scanned = 1; | |
3818 | for (i = 0; i < nr_pages; i++) { | |
3819 | struct page *page = pvec.pages[i]; | |
3820 | ||
3821 | if (!PagePrivate(page)) | |
3822 | continue; | |
3823 | ||
b5bae261 JB |
3824 | spin_lock(&mapping->private_lock); |
3825 | if (!PagePrivate(page)) { | |
3826 | spin_unlock(&mapping->private_lock); | |
3827 | continue; | |
3828 | } | |
3829 | ||
0b32f4bb | 3830 | eb = (struct extent_buffer *)page->private; |
b5bae261 JB |
3831 | |
3832 | /* | |
3833 | * Shouldn't happen and normally this would be a BUG_ON | |
3834 | * but no sense in crashing the users box for something | |
3835 | * we can survive anyway. | |
3836 | */ | |
fae7f21c | 3837 | if (WARN_ON(!eb)) { |
b5bae261 | 3838 | spin_unlock(&mapping->private_lock); |
0b32f4bb JB |
3839 | continue; |
3840 | } | |
3841 | ||
b5bae261 JB |
3842 | if (eb == prev_eb) { |
3843 | spin_unlock(&mapping->private_lock); | |
0b32f4bb | 3844 | continue; |
b5bae261 | 3845 | } |
0b32f4bb | 3846 | |
b5bae261 JB |
3847 | ret = atomic_inc_not_zero(&eb->refs); |
3848 | spin_unlock(&mapping->private_lock); | |
3849 | if (!ret) | |
0b32f4bb | 3850 | continue; |
0b32f4bb JB |
3851 | |
3852 | prev_eb = eb; | |
3853 | ret = lock_extent_buffer_for_io(eb, fs_info, &epd); | |
3854 | if (!ret) { | |
3855 | free_extent_buffer(eb); | |
3856 | continue; | |
3857 | } | |
3858 | ||
3859 | ret = write_one_eb(eb, fs_info, wbc, &epd); | |
3860 | if (ret) { | |
3861 | done = 1; | |
3862 | free_extent_buffer(eb); | |
3863 | break; | |
3864 | } | |
3865 | free_extent_buffer(eb); | |
3866 | ||
3867 | /* | |
3868 | * the filesystem may choose to bump up nr_to_write. | |
3869 | * We have to make sure to honor the new nr_to_write | |
3870 | * at any time | |
3871 | */ | |
3872 | nr_to_write_done = wbc->nr_to_write <= 0; | |
3873 | } | |
3874 | pagevec_release(&pvec); | |
3875 | cond_resched(); | |
3876 | } | |
3877 | if (!scanned && !done) { | |
3878 | /* | |
3879 | * We hit the last page and there is more work to be done: wrap | |
3880 | * back to the start of the file | |
3881 | */ | |
3882 | scanned = 1; | |
3883 | index = 0; | |
3884 | goto retry; | |
3885 | } | |
3886 | flush_write_bio(&epd); | |
3887 | return ret; | |
3888 | } | |
3889 | ||
d1310b2e | 3890 | /** |
4bef0848 | 3891 | * write_cache_pages - walk the list of dirty pages of the given address space and write all of them. |
d1310b2e CM |
3892 | * @mapping: address space structure to write |
3893 | * @wbc: subtract the number of written pages from *@wbc->nr_to_write | |
3894 | * @writepage: function called for each page | |
3895 | * @data: data passed to writepage function | |
3896 | * | |
3897 | * If a page is already under I/O, write_cache_pages() skips it, even | |
3898 | * if it's dirty. This is desirable behaviour for memory-cleaning writeback, | |
3899 | * but it is INCORRECT for data-integrity system calls such as fsync(). fsync() | |
3900 | * and msync() need to guarantee that all the data which was dirty at the time | |
3901 | * the call was made get new I/O started against them. If wbc->sync_mode is | |
3902 | * WB_SYNC_ALL then we were called for data integrity and we must wait for | |
3903 | * existing IO to complete. | |
3904 | */ | |
4242b64a | 3905 | static int extent_write_cache_pages(struct address_space *mapping, |
4bef0848 | 3906 | struct writeback_control *wbc, |
d2c3f4f6 CM |
3907 | writepage_t writepage, void *data, |
3908 | void (*flush_fn)(void *)) | |
d1310b2e | 3909 | { |
7fd1a3f7 | 3910 | struct inode *inode = mapping->host; |
d1310b2e CM |
3911 | int ret = 0; |
3912 | int done = 0; | |
f85d7d6c | 3913 | int nr_to_write_done = 0; |
d1310b2e CM |
3914 | struct pagevec pvec; |
3915 | int nr_pages; | |
3916 | pgoff_t index; | |
3917 | pgoff_t end; /* Inclusive */ | |
a9132667 LB |
3918 | pgoff_t done_index; |
3919 | int range_whole = 0; | |
d1310b2e | 3920 | int scanned = 0; |
f7aaa06b | 3921 | int tag; |
d1310b2e | 3922 | |
7fd1a3f7 JB |
3923 | /* |
3924 | * We have to hold onto the inode so that ordered extents can do their | |
3925 | * work when the IO finishes. The alternative to this is failing to add | |
3926 | * an ordered extent if the igrab() fails there and that is a huge pain | |
3927 | * to deal with, so instead just hold onto the inode throughout the | |
3928 | * writepages operation. If it fails here we are freeing up the inode | |
3929 | * anyway and we'd rather not waste our time writing out stuff that is | |
3930 | * going to be truncated anyway. | |
3931 | */ | |
3932 | if (!igrab(inode)) | |
3933 | return 0; | |
3934 | ||
86679820 | 3935 | pagevec_init(&pvec); |
d1310b2e CM |
3936 | if (wbc->range_cyclic) { |
3937 | index = mapping->writeback_index; /* Start from prev offset */ | |
3938 | end = -1; | |
3939 | } else { | |
09cbfeaf KS |
3940 | index = wbc->range_start >> PAGE_SHIFT; |
3941 | end = wbc->range_end >> PAGE_SHIFT; | |
a9132667 LB |
3942 | if (wbc->range_start == 0 && wbc->range_end == LLONG_MAX) |
3943 | range_whole = 1; | |
d1310b2e CM |
3944 | scanned = 1; |
3945 | } | |
f7aaa06b JB |
3946 | if (wbc->sync_mode == WB_SYNC_ALL) |
3947 | tag = PAGECACHE_TAG_TOWRITE; | |
3948 | else | |
3949 | tag = PAGECACHE_TAG_DIRTY; | |
d1310b2e | 3950 | retry: |
f7aaa06b JB |
3951 | if (wbc->sync_mode == WB_SYNC_ALL) |
3952 | tag_pages_for_writeback(mapping, index, end); | |
a9132667 | 3953 | done_index = index; |
f85d7d6c | 3954 | while (!done && !nr_to_write_done && (index <= end) && |
67fd707f JK |
3955 | (nr_pages = pagevec_lookup_range_tag(&pvec, mapping, |
3956 | &index, end, tag))) { | |
d1310b2e CM |
3957 | unsigned i; |
3958 | ||
3959 | scanned = 1; | |
3960 | for (i = 0; i < nr_pages; i++) { | |
3961 | struct page *page = pvec.pages[i]; | |
3962 | ||
a9132667 | 3963 | done_index = page->index; |
d1310b2e CM |
3964 | /* |
3965 | * At this point we hold neither mapping->tree_lock nor | |
3966 | * lock on the page itself: the page may be truncated or | |
3967 | * invalidated (changing page->mapping to NULL), or even | |
3968 | * swizzled back from swapper_space to tmpfs file | |
3969 | * mapping | |
3970 | */ | |
c8f2f24b JB |
3971 | if (!trylock_page(page)) { |
3972 | flush_fn(data); | |
3973 | lock_page(page); | |
01d658f2 | 3974 | } |
d1310b2e CM |
3975 | |
3976 | if (unlikely(page->mapping != mapping)) { | |
3977 | unlock_page(page); | |
3978 | continue; | |
3979 | } | |
3980 | ||
d2c3f4f6 | 3981 | if (wbc->sync_mode != WB_SYNC_NONE) { |
0e6bd956 CM |
3982 | if (PageWriteback(page)) |
3983 | flush_fn(data); | |
d1310b2e | 3984 | wait_on_page_writeback(page); |
d2c3f4f6 | 3985 | } |
d1310b2e CM |
3986 | |
3987 | if (PageWriteback(page) || | |
3988 | !clear_page_dirty_for_io(page)) { | |
3989 | unlock_page(page); | |
3990 | continue; | |
3991 | } | |
3992 | ||
3993 | ret = (*writepage)(page, wbc, data); | |
3994 | ||
3995 | if (unlikely(ret == AOP_WRITEPAGE_ACTIVATE)) { | |
3996 | unlock_page(page); | |
3997 | ret = 0; | |
3998 | } | |
a9132667 LB |
3999 | if (ret < 0) { |
4000 | /* | |
4001 | * done_index is set past this page, | |
4002 | * so media errors will not choke | |
4003 | * background writeout for the entire | |
4004 | * file. This has consequences for | |
4005 | * range_cyclic semantics (ie. it may | |
4006 | * not be suitable for data integrity | |
4007 | * writeout). | |
4008 | */ | |
4009 | done_index = page->index + 1; | |
4010 | done = 1; | |
4011 | break; | |
4012 | } | |
f85d7d6c CM |
4013 | |
4014 | /* | |
4015 | * the filesystem may choose to bump up nr_to_write. | |
4016 | * We have to make sure to honor the new nr_to_write | |
4017 | * at any time | |
4018 | */ | |
4019 | nr_to_write_done = wbc->nr_to_write <= 0; | |
d1310b2e CM |
4020 | } |
4021 | pagevec_release(&pvec); | |
4022 | cond_resched(); | |
4023 | } | |
894b36e3 | 4024 | if (!scanned && !done) { |
d1310b2e CM |
4025 | /* |
4026 | * We hit the last page and there is more work to be done: wrap | |
4027 | * back to the start of the file | |
4028 | */ | |
4029 | scanned = 1; | |
4030 | index = 0; | |
4031 | goto retry; | |
4032 | } | |
a9132667 LB |
4033 | |
4034 | if (wbc->range_cyclic || (wbc->nr_to_write > 0 && range_whole)) | |
4035 | mapping->writeback_index = done_index; | |
4036 | ||
7fd1a3f7 | 4037 | btrfs_add_delayed_iput(inode); |
894b36e3 | 4038 | return ret; |
d1310b2e | 4039 | } |
d1310b2e | 4040 | |
ffbd517d | 4041 | static void flush_epd_write_bio(struct extent_page_data *epd) |
d2c3f4f6 | 4042 | { |
d2c3f4f6 | 4043 | if (epd->bio) { |
355808c2 JM |
4044 | int ret; |
4045 | ||
18fdc679 | 4046 | ret = submit_one_bio(epd->bio, 0, 0); |
79787eaa | 4047 | BUG_ON(ret < 0); /* -ENOMEM */ |
d2c3f4f6 CM |
4048 | epd->bio = NULL; |
4049 | } | |
4050 | } | |
4051 | ||
ffbd517d CM |
4052 | static noinline void flush_write_bio(void *data) |
4053 | { | |
4054 | struct extent_page_data *epd = data; | |
4055 | flush_epd_write_bio(epd); | |
4056 | } | |
4057 | ||
d1310b2e | 4058 | int extent_write_full_page(struct extent_io_tree *tree, struct page *page, |
d1310b2e CM |
4059 | struct writeback_control *wbc) |
4060 | { | |
4061 | int ret; | |
d1310b2e CM |
4062 | struct extent_page_data epd = { |
4063 | .bio = NULL, | |
4064 | .tree = tree, | |
771ed689 | 4065 | .extent_locked = 0, |
ffbd517d | 4066 | .sync_io = wbc->sync_mode == WB_SYNC_ALL, |
d1310b2e | 4067 | }; |
d1310b2e | 4068 | |
d1310b2e CM |
4069 | ret = __extent_writepage(page, wbc, &epd); |
4070 | ||
ffbd517d | 4071 | flush_epd_write_bio(&epd); |
d1310b2e CM |
4072 | return ret; |
4073 | } | |
d1310b2e | 4074 | |
771ed689 | 4075 | int extent_write_locked_range(struct extent_io_tree *tree, struct inode *inode, |
916b9298 | 4076 | u64 start, u64 end, int mode) |
771ed689 CM |
4077 | { |
4078 | int ret = 0; | |
4079 | struct address_space *mapping = inode->i_mapping; | |
4080 | struct page *page; | |
09cbfeaf KS |
4081 | unsigned long nr_pages = (end - start + PAGE_SIZE) >> |
4082 | PAGE_SHIFT; | |
771ed689 CM |
4083 | |
4084 | struct extent_page_data epd = { | |
4085 | .bio = NULL, | |
4086 | .tree = tree, | |
771ed689 | 4087 | .extent_locked = 1, |
ffbd517d | 4088 | .sync_io = mode == WB_SYNC_ALL, |
771ed689 CM |
4089 | }; |
4090 | struct writeback_control wbc_writepages = { | |
771ed689 | 4091 | .sync_mode = mode, |
771ed689 CM |
4092 | .nr_to_write = nr_pages * 2, |
4093 | .range_start = start, | |
4094 | .range_end = end + 1, | |
4095 | }; | |
4096 | ||
d397712b | 4097 | while (start <= end) { |
09cbfeaf | 4098 | page = find_get_page(mapping, start >> PAGE_SHIFT); |
771ed689 CM |
4099 | if (clear_page_dirty_for_io(page)) |
4100 | ret = __extent_writepage(page, &wbc_writepages, &epd); | |
4101 | else { | |
4102 | if (tree->ops && tree->ops->writepage_end_io_hook) | |
4103 | tree->ops->writepage_end_io_hook(page, start, | |
09cbfeaf | 4104 | start + PAGE_SIZE - 1, |
771ed689 CM |
4105 | NULL, 1); |
4106 | unlock_page(page); | |
4107 | } | |
09cbfeaf KS |
4108 | put_page(page); |
4109 | start += PAGE_SIZE; | |
771ed689 CM |
4110 | } |
4111 | ||
ffbd517d | 4112 | flush_epd_write_bio(&epd); |
771ed689 CM |
4113 | return ret; |
4114 | } | |
d1310b2e CM |
4115 | |
4116 | int extent_writepages(struct extent_io_tree *tree, | |
4117 | struct address_space *mapping, | |
d1310b2e CM |
4118 | struct writeback_control *wbc) |
4119 | { | |
4120 | int ret = 0; | |
4121 | struct extent_page_data epd = { | |
4122 | .bio = NULL, | |
4123 | .tree = tree, | |
771ed689 | 4124 | .extent_locked = 0, |
ffbd517d | 4125 | .sync_io = wbc->sync_mode == WB_SYNC_ALL, |
d1310b2e CM |
4126 | }; |
4127 | ||
4242b64a | 4128 | ret = extent_write_cache_pages(mapping, wbc, __extent_writepage, &epd, |
d2c3f4f6 | 4129 | flush_write_bio); |
ffbd517d | 4130 | flush_epd_write_bio(&epd); |
d1310b2e CM |
4131 | return ret; |
4132 | } | |
d1310b2e CM |
4133 | |
4134 | int extent_readpages(struct extent_io_tree *tree, | |
4135 | struct address_space *mapping, | |
0932584b | 4136 | struct list_head *pages, unsigned nr_pages) |
d1310b2e CM |
4137 | { |
4138 | struct bio *bio = NULL; | |
4139 | unsigned page_idx; | |
c8b97818 | 4140 | unsigned long bio_flags = 0; |
67c9684f LB |
4141 | struct page *pagepool[16]; |
4142 | struct page *page; | |
125bac01 | 4143 | struct extent_map *em_cached = NULL; |
67c9684f | 4144 | int nr = 0; |
808f80b4 | 4145 | u64 prev_em_start = (u64)-1; |
d1310b2e | 4146 | |
d1310b2e | 4147 | for (page_idx = 0; page_idx < nr_pages; page_idx++) { |
67c9684f | 4148 | page = list_entry(pages->prev, struct page, lru); |
d1310b2e CM |
4149 | |
4150 | prefetchw(&page->flags); | |
4151 | list_del(&page->lru); | |
67c9684f | 4152 | if (add_to_page_cache_lru(page, mapping, |
8a5c743e MH |
4153 | page->index, |
4154 | readahead_gfp_mask(mapping))) { | |
09cbfeaf | 4155 | put_page(page); |
67c9684f | 4156 | continue; |
d1310b2e | 4157 | } |
67c9684f LB |
4158 | |
4159 | pagepool[nr++] = page; | |
4160 | if (nr < ARRAY_SIZE(pagepool)) | |
4161 | continue; | |
e4d17ef5 DS |
4162 | __extent_readpages(tree, pagepool, nr, &em_cached, &bio, |
4163 | &bio_flags, &prev_em_start); | |
67c9684f | 4164 | nr = 0; |
d1310b2e | 4165 | } |
9974090b | 4166 | if (nr) |
e4d17ef5 DS |
4167 | __extent_readpages(tree, pagepool, nr, &em_cached, &bio, |
4168 | &bio_flags, &prev_em_start); | |
67c9684f | 4169 | |
125bac01 MX |
4170 | if (em_cached) |
4171 | free_extent_map(em_cached); | |
4172 | ||
d1310b2e CM |
4173 | BUG_ON(!list_empty(pages)); |
4174 | if (bio) | |
1f7ad75b | 4175 | return submit_one_bio(bio, 0, bio_flags); |
d1310b2e CM |
4176 | return 0; |
4177 | } | |
d1310b2e CM |
4178 | |
4179 | /* | |
4180 | * basic invalidatepage code, this waits on any locked or writeback | |
4181 | * ranges corresponding to the page, and then deletes any extent state | |
4182 | * records from the tree | |
4183 | */ | |
4184 | int extent_invalidatepage(struct extent_io_tree *tree, | |
4185 | struct page *page, unsigned long offset) | |
4186 | { | |
2ac55d41 | 4187 | struct extent_state *cached_state = NULL; |
4eee4fa4 | 4188 | u64 start = page_offset(page); |
09cbfeaf | 4189 | u64 end = start + PAGE_SIZE - 1; |
d1310b2e CM |
4190 | size_t blocksize = page->mapping->host->i_sb->s_blocksize; |
4191 | ||
fda2832f | 4192 | start += ALIGN(offset, blocksize); |
d1310b2e CM |
4193 | if (start > end) |
4194 | return 0; | |
4195 | ||
ff13db41 | 4196 | lock_extent_bits(tree, start, end, &cached_state); |
1edbb734 | 4197 | wait_on_page_writeback(page); |
d1310b2e | 4198 | clear_extent_bit(tree, start, end, |
32c00aff JB |
4199 | EXTENT_LOCKED | EXTENT_DIRTY | EXTENT_DELALLOC | |
4200 | EXTENT_DO_ACCOUNTING, | |
ae0f1625 | 4201 | 1, 1, &cached_state); |
d1310b2e CM |
4202 | return 0; |
4203 | } | |
d1310b2e | 4204 | |
7b13b7b1 CM |
4205 | /* |
4206 | * a helper for releasepage, this tests for areas of the page that | |
4207 | * are locked or under IO and drops the related state bits if it is safe | |
4208 | * to drop the page. | |
4209 | */ | |
48a3b636 ES |
4210 | static int try_release_extent_state(struct extent_map_tree *map, |
4211 | struct extent_io_tree *tree, | |
4212 | struct page *page, gfp_t mask) | |
7b13b7b1 | 4213 | { |
4eee4fa4 | 4214 | u64 start = page_offset(page); |
09cbfeaf | 4215 | u64 end = start + PAGE_SIZE - 1; |
7b13b7b1 CM |
4216 | int ret = 1; |
4217 | ||
211f90e6 | 4218 | if (test_range_bit(tree, start, end, |
8b62b72b | 4219 | EXTENT_IOBITS, 0, NULL)) |
7b13b7b1 CM |
4220 | ret = 0; |
4221 | else { | |
11ef160f CM |
4222 | /* |
4223 | * at this point we can safely clear everything except the | |
4224 | * locked bit and the nodatasum bit | |
4225 | */ | |
66b0c887 | 4226 | ret = __clear_extent_bit(tree, start, end, |
11ef160f | 4227 | ~(EXTENT_LOCKED | EXTENT_NODATASUM), |
66b0c887 | 4228 | 0, 0, NULL, mask, NULL); |
e3f24cc5 CM |
4229 | |
4230 | /* if clear_extent_bit failed for enomem reasons, | |
4231 | * we can't allow the release to continue. | |
4232 | */ | |
4233 | if (ret < 0) | |
4234 | ret = 0; | |
4235 | else | |
4236 | ret = 1; | |
7b13b7b1 CM |
4237 | } |
4238 | return ret; | |
4239 | } | |
7b13b7b1 | 4240 | |
d1310b2e CM |
4241 | /* |
4242 | * a helper for releasepage. As long as there are no locked extents | |
4243 | * in the range corresponding to the page, both state records and extent | |
4244 | * map records are removed | |
4245 | */ | |
4246 | int try_release_extent_mapping(struct extent_map_tree *map, | |
70dec807 CM |
4247 | struct extent_io_tree *tree, struct page *page, |
4248 | gfp_t mask) | |
d1310b2e CM |
4249 | { |
4250 | struct extent_map *em; | |
4eee4fa4 | 4251 | u64 start = page_offset(page); |
09cbfeaf | 4252 | u64 end = start + PAGE_SIZE - 1; |
7b13b7b1 | 4253 | |
d0164adc | 4254 | if (gfpflags_allow_blocking(mask) && |
ee22184b | 4255 | page->mapping->host->i_size > SZ_16M) { |
39b5637f | 4256 | u64 len; |
70dec807 | 4257 | while (start <= end) { |
39b5637f | 4258 | len = end - start + 1; |
890871be | 4259 | write_lock(&map->lock); |
39b5637f | 4260 | em = lookup_extent_mapping(map, start, len); |
285190d9 | 4261 | if (!em) { |
890871be | 4262 | write_unlock(&map->lock); |
70dec807 CM |
4263 | break; |
4264 | } | |
7f3c74fb CM |
4265 | if (test_bit(EXTENT_FLAG_PINNED, &em->flags) || |
4266 | em->start != start) { | |
890871be | 4267 | write_unlock(&map->lock); |
70dec807 CM |
4268 | free_extent_map(em); |
4269 | break; | |
4270 | } | |
4271 | if (!test_range_bit(tree, em->start, | |
4272 | extent_map_end(em) - 1, | |
8b62b72b | 4273 | EXTENT_LOCKED | EXTENT_WRITEBACK, |
9655d298 | 4274 | 0, NULL)) { |
70dec807 CM |
4275 | remove_extent_mapping(map, em); |
4276 | /* once for the rb tree */ | |
4277 | free_extent_map(em); | |
4278 | } | |
4279 | start = extent_map_end(em); | |
890871be | 4280 | write_unlock(&map->lock); |
70dec807 CM |
4281 | |
4282 | /* once for us */ | |
d1310b2e CM |
4283 | free_extent_map(em); |
4284 | } | |
d1310b2e | 4285 | } |
7b13b7b1 | 4286 | return try_release_extent_state(map, tree, page, mask); |
d1310b2e | 4287 | } |
d1310b2e | 4288 | |
ec29ed5b CM |
4289 | /* |
4290 | * helper function for fiemap, which doesn't want to see any holes. | |
4291 | * This maps until we find something past 'last' | |
4292 | */ | |
4293 | static struct extent_map *get_extent_skip_holes(struct inode *inode, | |
e3350e16 | 4294 | u64 offset, u64 last) |
ec29ed5b | 4295 | { |
da17066c | 4296 | u64 sectorsize = btrfs_inode_sectorsize(inode); |
ec29ed5b CM |
4297 | struct extent_map *em; |
4298 | u64 len; | |
4299 | ||
4300 | if (offset >= last) | |
4301 | return NULL; | |
4302 | ||
67871254 | 4303 | while (1) { |
ec29ed5b CM |
4304 | len = last - offset; |
4305 | if (len == 0) | |
4306 | break; | |
fda2832f | 4307 | len = ALIGN(len, sectorsize); |
e3350e16 DS |
4308 | em = btrfs_get_extent_fiemap(BTRFS_I(inode), NULL, 0, offset, |
4309 | len, 0); | |
c704005d | 4310 | if (IS_ERR_OR_NULL(em)) |
ec29ed5b CM |
4311 | return em; |
4312 | ||
4313 | /* if this isn't a hole return it */ | |
4a2d25cd | 4314 | if (em->block_start != EXTENT_MAP_HOLE) |
ec29ed5b | 4315 | return em; |
ec29ed5b CM |
4316 | |
4317 | /* this is a hole, advance to the next extent */ | |
4318 | offset = extent_map_end(em); | |
4319 | free_extent_map(em); | |
4320 | if (offset >= last) | |
4321 | break; | |
4322 | } | |
4323 | return NULL; | |
4324 | } | |
4325 | ||
4751832d QW |
4326 | /* |
4327 | * To cache previous fiemap extent | |
4328 | * | |
4329 | * Will be used for merging fiemap extent | |
4330 | */ | |
4331 | struct fiemap_cache { | |
4332 | u64 offset; | |
4333 | u64 phys; | |
4334 | u64 len; | |
4335 | u32 flags; | |
4336 | bool cached; | |
4337 | }; | |
4338 | ||
4339 | /* | |
4340 | * Helper to submit fiemap extent. | |
4341 | * | |
4342 | * Will try to merge current fiemap extent specified by @offset, @phys, | |
4343 | * @len and @flags with cached one. | |
4344 | * And only when we fails to merge, cached one will be submitted as | |
4345 | * fiemap extent. | |
4346 | * | |
4347 | * Return value is the same as fiemap_fill_next_extent(). | |
4348 | */ | |
4349 | static int emit_fiemap_extent(struct fiemap_extent_info *fieinfo, | |
4350 | struct fiemap_cache *cache, | |
4351 | u64 offset, u64 phys, u64 len, u32 flags) | |
4352 | { | |
4353 | int ret = 0; | |
4354 | ||
4355 | if (!cache->cached) | |
4356 | goto assign; | |
4357 | ||
4358 | /* | |
4359 | * Sanity check, extent_fiemap() should have ensured that new | |
4360 | * fiemap extent won't overlap with cahced one. | |
4361 | * Not recoverable. | |
4362 | * | |
4363 | * NOTE: Physical address can overlap, due to compression | |
4364 | */ | |
4365 | if (cache->offset + cache->len > offset) { | |
4366 | WARN_ON(1); | |
4367 | return -EINVAL; | |
4368 | } | |
4369 | ||
4370 | /* | |
4371 | * Only merges fiemap extents if | |
4372 | * 1) Their logical addresses are continuous | |
4373 | * | |
4374 | * 2) Their physical addresses are continuous | |
4375 | * So truly compressed (physical size smaller than logical size) | |
4376 | * extents won't get merged with each other | |
4377 | * | |
4378 | * 3) Share same flags except FIEMAP_EXTENT_LAST | |
4379 | * So regular extent won't get merged with prealloc extent | |
4380 | */ | |
4381 | if (cache->offset + cache->len == offset && | |
4382 | cache->phys + cache->len == phys && | |
4383 | (cache->flags & ~FIEMAP_EXTENT_LAST) == | |
4384 | (flags & ~FIEMAP_EXTENT_LAST)) { | |
4385 | cache->len += len; | |
4386 | cache->flags |= flags; | |
4387 | goto try_submit_last; | |
4388 | } | |
4389 | ||
4390 | /* Not mergeable, need to submit cached one */ | |
4391 | ret = fiemap_fill_next_extent(fieinfo, cache->offset, cache->phys, | |
4392 | cache->len, cache->flags); | |
4393 | cache->cached = false; | |
4394 | if (ret) | |
4395 | return ret; | |
4396 | assign: | |
4397 | cache->cached = true; | |
4398 | cache->offset = offset; | |
4399 | cache->phys = phys; | |
4400 | cache->len = len; | |
4401 | cache->flags = flags; | |
4402 | try_submit_last: | |
4403 | if (cache->flags & FIEMAP_EXTENT_LAST) { | |
4404 | ret = fiemap_fill_next_extent(fieinfo, cache->offset, | |
4405 | cache->phys, cache->len, cache->flags); | |
4406 | cache->cached = false; | |
4407 | } | |
4408 | return ret; | |
4409 | } | |
4410 | ||
4411 | /* | |
848c23b7 | 4412 | * Emit last fiemap cache |
4751832d | 4413 | * |
848c23b7 QW |
4414 | * The last fiemap cache may still be cached in the following case: |
4415 | * 0 4k 8k | |
4416 | * |<- Fiemap range ->| | |
4417 | * |<------------ First extent ----------->| | |
4418 | * | |
4419 | * In this case, the first extent range will be cached but not emitted. | |
4420 | * So we must emit it before ending extent_fiemap(). | |
4751832d | 4421 | */ |
848c23b7 QW |
4422 | static int emit_last_fiemap_cache(struct btrfs_fs_info *fs_info, |
4423 | struct fiemap_extent_info *fieinfo, | |
4424 | struct fiemap_cache *cache) | |
4751832d QW |
4425 | { |
4426 | int ret; | |
4427 | ||
4428 | if (!cache->cached) | |
4429 | return 0; | |
4430 | ||
4751832d QW |
4431 | ret = fiemap_fill_next_extent(fieinfo, cache->offset, cache->phys, |
4432 | cache->len, cache->flags); | |
4433 | cache->cached = false; | |
4434 | if (ret > 0) | |
4435 | ret = 0; | |
4436 | return ret; | |
4437 | } | |
4438 | ||
1506fcc8 | 4439 | int extent_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, |
2135fb9b | 4440 | __u64 start, __u64 len) |
1506fcc8 | 4441 | { |
975f84fe | 4442 | int ret = 0; |
1506fcc8 YS |
4443 | u64 off = start; |
4444 | u64 max = start + len; | |
4445 | u32 flags = 0; | |
975f84fe JB |
4446 | u32 found_type; |
4447 | u64 last; | |
ec29ed5b | 4448 | u64 last_for_get_extent = 0; |
1506fcc8 | 4449 | u64 disko = 0; |
ec29ed5b | 4450 | u64 isize = i_size_read(inode); |
975f84fe | 4451 | struct btrfs_key found_key; |
1506fcc8 | 4452 | struct extent_map *em = NULL; |
2ac55d41 | 4453 | struct extent_state *cached_state = NULL; |
975f84fe | 4454 | struct btrfs_path *path; |
dc046b10 | 4455 | struct btrfs_root *root = BTRFS_I(inode)->root; |
4751832d | 4456 | struct fiemap_cache cache = { 0 }; |
1506fcc8 | 4457 | int end = 0; |
ec29ed5b CM |
4458 | u64 em_start = 0; |
4459 | u64 em_len = 0; | |
4460 | u64 em_end = 0; | |
1506fcc8 YS |
4461 | |
4462 | if (len == 0) | |
4463 | return -EINVAL; | |
4464 | ||
975f84fe JB |
4465 | path = btrfs_alloc_path(); |
4466 | if (!path) | |
4467 | return -ENOMEM; | |
4468 | path->leave_spinning = 1; | |
4469 | ||
da17066c JM |
4470 | start = round_down(start, btrfs_inode_sectorsize(inode)); |
4471 | len = round_up(max, btrfs_inode_sectorsize(inode)) - start; | |
4d479cf0 | 4472 | |
ec29ed5b CM |
4473 | /* |
4474 | * lookup the last file extent. We're not using i_size here | |
4475 | * because there might be preallocation past i_size | |
4476 | */ | |
f85b7379 DS |
4477 | ret = btrfs_lookup_file_extent(NULL, root, path, |
4478 | btrfs_ino(BTRFS_I(inode)), -1, 0); | |
975f84fe JB |
4479 | if (ret < 0) { |
4480 | btrfs_free_path(path); | |
4481 | return ret; | |
2d324f59 LB |
4482 | } else { |
4483 | WARN_ON(!ret); | |
4484 | if (ret == 1) | |
4485 | ret = 0; | |
975f84fe | 4486 | } |
2d324f59 | 4487 | |
975f84fe | 4488 | path->slots[0]--; |
975f84fe | 4489 | btrfs_item_key_to_cpu(path->nodes[0], &found_key, path->slots[0]); |
962a298f | 4490 | found_type = found_key.type; |
975f84fe | 4491 | |
ec29ed5b | 4492 | /* No extents, but there might be delalloc bits */ |
4a0cc7ca | 4493 | if (found_key.objectid != btrfs_ino(BTRFS_I(inode)) || |
975f84fe | 4494 | found_type != BTRFS_EXTENT_DATA_KEY) { |
ec29ed5b CM |
4495 | /* have to trust i_size as the end */ |
4496 | last = (u64)-1; | |
4497 | last_for_get_extent = isize; | |
4498 | } else { | |
4499 | /* | |
4500 | * remember the start of the last extent. There are a | |
4501 | * bunch of different factors that go into the length of the | |
4502 | * extent, so its much less complex to remember where it started | |
4503 | */ | |
4504 | last = found_key.offset; | |
4505 | last_for_get_extent = last + 1; | |
975f84fe | 4506 | } |
fe09e16c | 4507 | btrfs_release_path(path); |
975f84fe | 4508 | |
ec29ed5b CM |
4509 | /* |
4510 | * we might have some extents allocated but more delalloc past those | |
4511 | * extents. so, we trust isize unless the start of the last extent is | |
4512 | * beyond isize | |
4513 | */ | |
4514 | if (last < isize) { | |
4515 | last = (u64)-1; | |
4516 | last_for_get_extent = isize; | |
4517 | } | |
4518 | ||
ff13db41 | 4519 | lock_extent_bits(&BTRFS_I(inode)->io_tree, start, start + len - 1, |
d0082371 | 4520 | &cached_state); |
ec29ed5b | 4521 | |
e3350e16 | 4522 | em = get_extent_skip_holes(inode, start, last_for_get_extent); |
1506fcc8 YS |
4523 | if (!em) |
4524 | goto out; | |
4525 | if (IS_ERR(em)) { | |
4526 | ret = PTR_ERR(em); | |
4527 | goto out; | |
4528 | } | |
975f84fe | 4529 | |
1506fcc8 | 4530 | while (!end) { |
b76bb701 | 4531 | u64 offset_in_extent = 0; |
ea8efc74 CM |
4532 | |
4533 | /* break if the extent we found is outside the range */ | |
4534 | if (em->start >= max || extent_map_end(em) < off) | |
4535 | break; | |
4536 | ||
4537 | /* | |
4538 | * get_extent may return an extent that starts before our | |
4539 | * requested range. We have to make sure the ranges | |
4540 | * we return to fiemap always move forward and don't | |
4541 | * overlap, so adjust the offsets here | |
4542 | */ | |
4543 | em_start = max(em->start, off); | |
1506fcc8 | 4544 | |
ea8efc74 CM |
4545 | /* |
4546 | * record the offset from the start of the extent | |
b76bb701 JB |
4547 | * for adjusting the disk offset below. Only do this if the |
4548 | * extent isn't compressed since our in ram offset may be past | |
4549 | * what we have actually allocated on disk. | |
ea8efc74 | 4550 | */ |
b76bb701 JB |
4551 | if (!test_bit(EXTENT_FLAG_COMPRESSED, &em->flags)) |
4552 | offset_in_extent = em_start - em->start; | |
ec29ed5b | 4553 | em_end = extent_map_end(em); |
ea8efc74 | 4554 | em_len = em_end - em_start; |
1506fcc8 YS |
4555 | disko = 0; |
4556 | flags = 0; | |
4557 | ||
ea8efc74 CM |
4558 | /* |
4559 | * bump off for our next call to get_extent | |
4560 | */ | |
4561 | off = extent_map_end(em); | |
4562 | if (off >= max) | |
4563 | end = 1; | |
4564 | ||
93dbfad7 | 4565 | if (em->block_start == EXTENT_MAP_LAST_BYTE) { |
1506fcc8 YS |
4566 | end = 1; |
4567 | flags |= FIEMAP_EXTENT_LAST; | |
93dbfad7 | 4568 | } else if (em->block_start == EXTENT_MAP_INLINE) { |
1506fcc8 YS |
4569 | flags |= (FIEMAP_EXTENT_DATA_INLINE | |
4570 | FIEMAP_EXTENT_NOT_ALIGNED); | |
93dbfad7 | 4571 | } else if (em->block_start == EXTENT_MAP_DELALLOC) { |
1506fcc8 YS |
4572 | flags |= (FIEMAP_EXTENT_DELALLOC | |
4573 | FIEMAP_EXTENT_UNKNOWN); | |
dc046b10 JB |
4574 | } else if (fieinfo->fi_extents_max) { |
4575 | u64 bytenr = em->block_start - | |
4576 | (em->start - em->orig_start); | |
fe09e16c | 4577 | |
ea8efc74 | 4578 | disko = em->block_start + offset_in_extent; |
fe09e16c LB |
4579 | |
4580 | /* | |
4581 | * As btrfs supports shared space, this information | |
4582 | * can be exported to userspace tools via | |
dc046b10 JB |
4583 | * flag FIEMAP_EXTENT_SHARED. If fi_extents_max == 0 |
4584 | * then we're just getting a count and we can skip the | |
4585 | * lookup stuff. | |
fe09e16c | 4586 | */ |
bb739cf0 EN |
4587 | ret = btrfs_check_shared(root, |
4588 | btrfs_ino(BTRFS_I(inode)), | |
4589 | bytenr); | |
dc046b10 | 4590 | if (ret < 0) |
fe09e16c | 4591 | goto out_free; |
dc046b10 | 4592 | if (ret) |
fe09e16c | 4593 | flags |= FIEMAP_EXTENT_SHARED; |
dc046b10 | 4594 | ret = 0; |
1506fcc8 YS |
4595 | } |
4596 | if (test_bit(EXTENT_FLAG_COMPRESSED, &em->flags)) | |
4597 | flags |= FIEMAP_EXTENT_ENCODED; | |
0d2b2372 JB |
4598 | if (test_bit(EXTENT_FLAG_PREALLOC, &em->flags)) |
4599 | flags |= FIEMAP_EXTENT_UNWRITTEN; | |
1506fcc8 | 4600 | |
1506fcc8 YS |
4601 | free_extent_map(em); |
4602 | em = NULL; | |
ec29ed5b CM |
4603 | if ((em_start >= last) || em_len == (u64)-1 || |
4604 | (last == (u64)-1 && isize <= em_end)) { | |
1506fcc8 YS |
4605 | flags |= FIEMAP_EXTENT_LAST; |
4606 | end = 1; | |
4607 | } | |
4608 | ||
ec29ed5b | 4609 | /* now scan forward to see if this is really the last extent. */ |
e3350e16 | 4610 | em = get_extent_skip_holes(inode, off, last_for_get_extent); |
ec29ed5b CM |
4611 | if (IS_ERR(em)) { |
4612 | ret = PTR_ERR(em); | |
4613 | goto out; | |
4614 | } | |
4615 | if (!em) { | |
975f84fe JB |
4616 | flags |= FIEMAP_EXTENT_LAST; |
4617 | end = 1; | |
4618 | } | |
4751832d QW |
4619 | ret = emit_fiemap_extent(fieinfo, &cache, em_start, disko, |
4620 | em_len, flags); | |
26e726af CS |
4621 | if (ret) { |
4622 | if (ret == 1) | |
4623 | ret = 0; | |
ec29ed5b | 4624 | goto out_free; |
26e726af | 4625 | } |
1506fcc8 YS |
4626 | } |
4627 | out_free: | |
4751832d | 4628 | if (!ret) |
848c23b7 | 4629 | ret = emit_last_fiemap_cache(root->fs_info, fieinfo, &cache); |
1506fcc8 YS |
4630 | free_extent_map(em); |
4631 | out: | |
fe09e16c | 4632 | btrfs_free_path(path); |
a52f4cd2 | 4633 | unlock_extent_cached(&BTRFS_I(inode)->io_tree, start, start + len - 1, |
2ac55d41 | 4634 | &cached_state, GFP_NOFS); |
1506fcc8 YS |
4635 | return ret; |
4636 | } | |
4637 | ||
727011e0 CM |
4638 | static void __free_extent_buffer(struct extent_buffer *eb) |
4639 | { | |
6d49ba1b | 4640 | btrfs_leak_debug_del(&eb->leak_list); |
727011e0 CM |
4641 | kmem_cache_free(extent_buffer_cache, eb); |
4642 | } | |
4643 | ||
a26e8c9f | 4644 | int extent_buffer_under_io(struct extent_buffer *eb) |
db7f3436 JB |
4645 | { |
4646 | return (atomic_read(&eb->io_pages) || | |
4647 | test_bit(EXTENT_BUFFER_WRITEBACK, &eb->bflags) || | |
4648 | test_bit(EXTENT_BUFFER_DIRTY, &eb->bflags)); | |
4649 | } | |
4650 | ||
4651 | /* | |
4652 | * Helper for releasing extent buffer page. | |
4653 | */ | |
a50924e3 | 4654 | static void btrfs_release_extent_buffer_page(struct extent_buffer *eb) |
db7f3436 JB |
4655 | { |
4656 | unsigned long index; | |
db7f3436 JB |
4657 | struct page *page; |
4658 | int mapped = !test_bit(EXTENT_BUFFER_DUMMY, &eb->bflags); | |
4659 | ||
4660 | BUG_ON(extent_buffer_under_io(eb)); | |
4661 | ||
a50924e3 DS |
4662 | index = num_extent_pages(eb->start, eb->len); |
4663 | if (index == 0) | |
db7f3436 JB |
4664 | return; |
4665 | ||
4666 | do { | |
4667 | index--; | |
fb85fc9a | 4668 | page = eb->pages[index]; |
5d2361db FL |
4669 | if (!page) |
4670 | continue; | |
4671 | if (mapped) | |
db7f3436 | 4672 | spin_lock(&page->mapping->private_lock); |
5d2361db FL |
4673 | /* |
4674 | * We do this since we'll remove the pages after we've | |
4675 | * removed the eb from the radix tree, so we could race | |
4676 | * and have this page now attached to the new eb. So | |
4677 | * only clear page_private if it's still connected to | |
4678 | * this eb. | |
4679 | */ | |
4680 | if (PagePrivate(page) && | |
4681 | page->private == (unsigned long)eb) { | |
4682 | BUG_ON(test_bit(EXTENT_BUFFER_DIRTY, &eb->bflags)); | |
4683 | BUG_ON(PageDirty(page)); | |
4684 | BUG_ON(PageWriteback(page)); | |
db7f3436 | 4685 | /* |
5d2361db FL |
4686 | * We need to make sure we haven't be attached |
4687 | * to a new eb. | |
db7f3436 | 4688 | */ |
5d2361db FL |
4689 | ClearPagePrivate(page); |
4690 | set_page_private(page, 0); | |
4691 | /* One for the page private */ | |
09cbfeaf | 4692 | put_page(page); |
db7f3436 | 4693 | } |
5d2361db FL |
4694 | |
4695 | if (mapped) | |
4696 | spin_unlock(&page->mapping->private_lock); | |
4697 | ||
01327610 | 4698 | /* One for when we allocated the page */ |
09cbfeaf | 4699 | put_page(page); |
a50924e3 | 4700 | } while (index != 0); |
db7f3436 JB |
4701 | } |
4702 | ||
4703 | /* | |
4704 | * Helper for releasing the extent buffer. | |
4705 | */ | |
4706 | static inline void btrfs_release_extent_buffer(struct extent_buffer *eb) | |
4707 | { | |
a50924e3 | 4708 | btrfs_release_extent_buffer_page(eb); |
db7f3436 JB |
4709 | __free_extent_buffer(eb); |
4710 | } | |
4711 | ||
f28491e0 JB |
4712 | static struct extent_buffer * |
4713 | __alloc_extent_buffer(struct btrfs_fs_info *fs_info, u64 start, | |
23d79d81 | 4714 | unsigned long len) |
d1310b2e CM |
4715 | { |
4716 | struct extent_buffer *eb = NULL; | |
4717 | ||
d1b5c567 | 4718 | eb = kmem_cache_zalloc(extent_buffer_cache, GFP_NOFS|__GFP_NOFAIL); |
d1310b2e CM |
4719 | eb->start = start; |
4720 | eb->len = len; | |
f28491e0 | 4721 | eb->fs_info = fs_info; |
815a51c7 | 4722 | eb->bflags = 0; |
bd681513 CM |
4723 | rwlock_init(&eb->lock); |
4724 | atomic_set(&eb->write_locks, 0); | |
4725 | atomic_set(&eb->read_locks, 0); | |
4726 | atomic_set(&eb->blocking_readers, 0); | |
4727 | atomic_set(&eb->blocking_writers, 0); | |
4728 | atomic_set(&eb->spinning_readers, 0); | |
4729 | atomic_set(&eb->spinning_writers, 0); | |
5b25f70f | 4730 | eb->lock_nested = 0; |
bd681513 CM |
4731 | init_waitqueue_head(&eb->write_lock_wq); |
4732 | init_waitqueue_head(&eb->read_lock_wq); | |
b4ce94de | 4733 | |
6d49ba1b ES |
4734 | btrfs_leak_debug_add(&eb->leak_list, &buffers); |
4735 | ||
3083ee2e | 4736 | spin_lock_init(&eb->refs_lock); |
d1310b2e | 4737 | atomic_set(&eb->refs, 1); |
0b32f4bb | 4738 | atomic_set(&eb->io_pages, 0); |
727011e0 | 4739 | |
b8dae313 DS |
4740 | /* |
4741 | * Sanity checks, currently the maximum is 64k covered by 16x 4k pages | |
4742 | */ | |
4743 | BUILD_BUG_ON(BTRFS_MAX_METADATA_BLOCKSIZE | |
4744 | > MAX_INLINE_EXTENT_BUFFER_SIZE); | |
4745 | BUG_ON(len > MAX_INLINE_EXTENT_BUFFER_SIZE); | |
d1310b2e CM |
4746 | |
4747 | return eb; | |
4748 | } | |
4749 | ||
815a51c7 JS |
4750 | struct extent_buffer *btrfs_clone_extent_buffer(struct extent_buffer *src) |
4751 | { | |
4752 | unsigned long i; | |
4753 | struct page *p; | |
4754 | struct extent_buffer *new; | |
4755 | unsigned long num_pages = num_extent_pages(src->start, src->len); | |
4756 | ||
3f556f78 | 4757 | new = __alloc_extent_buffer(src->fs_info, src->start, src->len); |
815a51c7 JS |
4758 | if (new == NULL) |
4759 | return NULL; | |
4760 | ||
4761 | for (i = 0; i < num_pages; i++) { | |
9ec72677 | 4762 | p = alloc_page(GFP_NOFS); |
db7f3436 JB |
4763 | if (!p) { |
4764 | btrfs_release_extent_buffer(new); | |
4765 | return NULL; | |
4766 | } | |
815a51c7 JS |
4767 | attach_extent_buffer_page(new, p); |
4768 | WARN_ON(PageDirty(p)); | |
4769 | SetPageUptodate(p); | |
4770 | new->pages[i] = p; | |
fba1acf9 | 4771 | copy_page(page_address(p), page_address(src->pages[i])); |
815a51c7 JS |
4772 | } |
4773 | ||
815a51c7 JS |
4774 | set_bit(EXTENT_BUFFER_UPTODATE, &new->bflags); |
4775 | set_bit(EXTENT_BUFFER_DUMMY, &new->bflags); | |
4776 | ||
4777 | return new; | |
4778 | } | |
4779 | ||
0f331229 OS |
4780 | struct extent_buffer *__alloc_dummy_extent_buffer(struct btrfs_fs_info *fs_info, |
4781 | u64 start, unsigned long len) | |
815a51c7 JS |
4782 | { |
4783 | struct extent_buffer *eb; | |
3f556f78 | 4784 | unsigned long num_pages; |
815a51c7 JS |
4785 | unsigned long i; |
4786 | ||
0f331229 | 4787 | num_pages = num_extent_pages(start, len); |
3f556f78 DS |
4788 | |
4789 | eb = __alloc_extent_buffer(fs_info, start, len); | |
815a51c7 JS |
4790 | if (!eb) |
4791 | return NULL; | |
4792 | ||
4793 | for (i = 0; i < num_pages; i++) { | |
9ec72677 | 4794 | eb->pages[i] = alloc_page(GFP_NOFS); |
815a51c7 JS |
4795 | if (!eb->pages[i]) |
4796 | goto err; | |
4797 | } | |
4798 | set_extent_buffer_uptodate(eb); | |
4799 | btrfs_set_header_nritems(eb, 0); | |
4800 | set_bit(EXTENT_BUFFER_DUMMY, &eb->bflags); | |
4801 | ||
4802 | return eb; | |
4803 | err: | |
84167d19 SB |
4804 | for (; i > 0; i--) |
4805 | __free_page(eb->pages[i - 1]); | |
815a51c7 JS |
4806 | __free_extent_buffer(eb); |
4807 | return NULL; | |
4808 | } | |
4809 | ||
0f331229 | 4810 | struct extent_buffer *alloc_dummy_extent_buffer(struct btrfs_fs_info *fs_info, |
da17066c | 4811 | u64 start) |
0f331229 | 4812 | { |
da17066c | 4813 | return __alloc_dummy_extent_buffer(fs_info, start, fs_info->nodesize); |
0f331229 OS |
4814 | } |
4815 | ||
0b32f4bb JB |
4816 | static void check_buffer_tree_ref(struct extent_buffer *eb) |
4817 | { | |
242e18c7 | 4818 | int refs; |
0b32f4bb JB |
4819 | /* the ref bit is tricky. We have to make sure it is set |
4820 | * if we have the buffer dirty. Otherwise the | |
4821 | * code to free a buffer can end up dropping a dirty | |
4822 | * page | |
4823 | * | |
4824 | * Once the ref bit is set, it won't go away while the | |
4825 | * buffer is dirty or in writeback, and it also won't | |
4826 | * go away while we have the reference count on the | |
4827 | * eb bumped. | |
4828 | * | |
4829 | * We can't just set the ref bit without bumping the | |
4830 | * ref on the eb because free_extent_buffer might | |
4831 | * see the ref bit and try to clear it. If this happens | |
4832 | * free_extent_buffer might end up dropping our original | |
4833 | * ref by mistake and freeing the page before we are able | |
4834 | * to add one more ref. | |
4835 | * | |
4836 | * So bump the ref count first, then set the bit. If someone | |
4837 | * beat us to it, drop the ref we added. | |
4838 | */ | |
242e18c7 CM |
4839 | refs = atomic_read(&eb->refs); |
4840 | if (refs >= 2 && test_bit(EXTENT_BUFFER_TREE_REF, &eb->bflags)) | |
4841 | return; | |
4842 | ||
594831c4 JB |
4843 | spin_lock(&eb->refs_lock); |
4844 | if (!test_and_set_bit(EXTENT_BUFFER_TREE_REF, &eb->bflags)) | |
0b32f4bb | 4845 | atomic_inc(&eb->refs); |
594831c4 | 4846 | spin_unlock(&eb->refs_lock); |
0b32f4bb JB |
4847 | } |
4848 | ||
2457aec6 MG |
4849 | static void mark_extent_buffer_accessed(struct extent_buffer *eb, |
4850 | struct page *accessed) | |
5df4235e JB |
4851 | { |
4852 | unsigned long num_pages, i; | |
4853 | ||
0b32f4bb JB |
4854 | check_buffer_tree_ref(eb); |
4855 | ||
5df4235e JB |
4856 | num_pages = num_extent_pages(eb->start, eb->len); |
4857 | for (i = 0; i < num_pages; i++) { | |
fb85fc9a DS |
4858 | struct page *p = eb->pages[i]; |
4859 | ||
2457aec6 MG |
4860 | if (p != accessed) |
4861 | mark_page_accessed(p); | |
5df4235e JB |
4862 | } |
4863 | } | |
4864 | ||
f28491e0 JB |
4865 | struct extent_buffer *find_extent_buffer(struct btrfs_fs_info *fs_info, |
4866 | u64 start) | |
452c75c3 CS |
4867 | { |
4868 | struct extent_buffer *eb; | |
4869 | ||
4870 | rcu_read_lock(); | |
f28491e0 | 4871 | eb = radix_tree_lookup(&fs_info->buffer_radix, |
09cbfeaf | 4872 | start >> PAGE_SHIFT); |
452c75c3 CS |
4873 | if (eb && atomic_inc_not_zero(&eb->refs)) { |
4874 | rcu_read_unlock(); | |
062c19e9 FM |
4875 | /* |
4876 | * Lock our eb's refs_lock to avoid races with | |
4877 | * free_extent_buffer. When we get our eb it might be flagged | |
4878 | * with EXTENT_BUFFER_STALE and another task running | |
4879 | * free_extent_buffer might have seen that flag set, | |
4880 | * eb->refs == 2, that the buffer isn't under IO (dirty and | |
4881 | * writeback flags not set) and it's still in the tree (flag | |
4882 | * EXTENT_BUFFER_TREE_REF set), therefore being in the process | |
4883 | * of decrementing the extent buffer's reference count twice. | |
4884 | * So here we could race and increment the eb's reference count, | |
4885 | * clear its stale flag, mark it as dirty and drop our reference | |
4886 | * before the other task finishes executing free_extent_buffer, | |
4887 | * which would later result in an attempt to free an extent | |
4888 | * buffer that is dirty. | |
4889 | */ | |
4890 | if (test_bit(EXTENT_BUFFER_STALE, &eb->bflags)) { | |
4891 | spin_lock(&eb->refs_lock); | |
4892 | spin_unlock(&eb->refs_lock); | |
4893 | } | |
2457aec6 | 4894 | mark_extent_buffer_accessed(eb, NULL); |
452c75c3 CS |
4895 | return eb; |
4896 | } | |
4897 | rcu_read_unlock(); | |
4898 | ||
4899 | return NULL; | |
4900 | } | |
4901 | ||
faa2dbf0 JB |
4902 | #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS |
4903 | struct extent_buffer *alloc_test_extent_buffer(struct btrfs_fs_info *fs_info, | |
da17066c | 4904 | u64 start) |
faa2dbf0 JB |
4905 | { |
4906 | struct extent_buffer *eb, *exists = NULL; | |
4907 | int ret; | |
4908 | ||
4909 | eb = find_extent_buffer(fs_info, start); | |
4910 | if (eb) | |
4911 | return eb; | |
da17066c | 4912 | eb = alloc_dummy_extent_buffer(fs_info, start); |
faa2dbf0 JB |
4913 | if (!eb) |
4914 | return NULL; | |
4915 | eb->fs_info = fs_info; | |
4916 | again: | |
e1860a77 | 4917 | ret = radix_tree_preload(GFP_NOFS); |
faa2dbf0 JB |
4918 | if (ret) |
4919 | goto free_eb; | |
4920 | spin_lock(&fs_info->buffer_lock); | |
4921 | ret = radix_tree_insert(&fs_info->buffer_radix, | |
09cbfeaf | 4922 | start >> PAGE_SHIFT, eb); |
faa2dbf0 JB |
4923 | spin_unlock(&fs_info->buffer_lock); |
4924 | radix_tree_preload_end(); | |
4925 | if (ret == -EEXIST) { | |
4926 | exists = find_extent_buffer(fs_info, start); | |
4927 | if (exists) | |
4928 | goto free_eb; | |
4929 | else | |
4930 | goto again; | |
4931 | } | |
4932 | check_buffer_tree_ref(eb); | |
4933 | set_bit(EXTENT_BUFFER_IN_TREE, &eb->bflags); | |
4934 | ||
4935 | /* | |
4936 | * We will free dummy extent buffer's if they come into | |
4937 | * free_extent_buffer with a ref count of 2, but if we are using this we | |
4938 | * want the buffers to stay in memory until we're done with them, so | |
4939 | * bump the ref count again. | |
4940 | */ | |
4941 | atomic_inc(&eb->refs); | |
4942 | return eb; | |
4943 | free_eb: | |
4944 | btrfs_release_extent_buffer(eb); | |
4945 | return exists; | |
4946 | } | |
4947 | #endif | |
4948 | ||
f28491e0 | 4949 | struct extent_buffer *alloc_extent_buffer(struct btrfs_fs_info *fs_info, |
ce3e6984 | 4950 | u64 start) |
d1310b2e | 4951 | { |
da17066c | 4952 | unsigned long len = fs_info->nodesize; |
d1310b2e CM |
4953 | unsigned long num_pages = num_extent_pages(start, len); |
4954 | unsigned long i; | |
09cbfeaf | 4955 | unsigned long index = start >> PAGE_SHIFT; |
d1310b2e | 4956 | struct extent_buffer *eb; |
6af118ce | 4957 | struct extent_buffer *exists = NULL; |
d1310b2e | 4958 | struct page *p; |
f28491e0 | 4959 | struct address_space *mapping = fs_info->btree_inode->i_mapping; |
d1310b2e | 4960 | int uptodate = 1; |
19fe0a8b | 4961 | int ret; |
d1310b2e | 4962 | |
da17066c | 4963 | if (!IS_ALIGNED(start, fs_info->sectorsize)) { |
c871b0f2 LB |
4964 | btrfs_err(fs_info, "bad tree block start %llu", start); |
4965 | return ERR_PTR(-EINVAL); | |
4966 | } | |
4967 | ||
f28491e0 | 4968 | eb = find_extent_buffer(fs_info, start); |
452c75c3 | 4969 | if (eb) |
6af118ce | 4970 | return eb; |
6af118ce | 4971 | |
23d79d81 | 4972 | eb = __alloc_extent_buffer(fs_info, start, len); |
2b114d1d | 4973 | if (!eb) |
c871b0f2 | 4974 | return ERR_PTR(-ENOMEM); |
d1310b2e | 4975 | |
727011e0 | 4976 | for (i = 0; i < num_pages; i++, index++) { |
d1b5c567 | 4977 | p = find_or_create_page(mapping, index, GFP_NOFS|__GFP_NOFAIL); |
c871b0f2 LB |
4978 | if (!p) { |
4979 | exists = ERR_PTR(-ENOMEM); | |
6af118ce | 4980 | goto free_eb; |
c871b0f2 | 4981 | } |
4f2de97a JB |
4982 | |
4983 | spin_lock(&mapping->private_lock); | |
4984 | if (PagePrivate(p)) { | |
4985 | /* | |
4986 | * We could have already allocated an eb for this page | |
4987 | * and attached one so lets see if we can get a ref on | |
4988 | * the existing eb, and if we can we know it's good and | |
4989 | * we can just return that one, else we know we can just | |
4990 | * overwrite page->private. | |
4991 | */ | |
4992 | exists = (struct extent_buffer *)p->private; | |
4993 | if (atomic_inc_not_zero(&exists->refs)) { | |
4994 | spin_unlock(&mapping->private_lock); | |
4995 | unlock_page(p); | |
09cbfeaf | 4996 | put_page(p); |
2457aec6 | 4997 | mark_extent_buffer_accessed(exists, p); |
4f2de97a JB |
4998 | goto free_eb; |
4999 | } | |
5ca64f45 | 5000 | exists = NULL; |
4f2de97a | 5001 | |
0b32f4bb | 5002 | /* |
4f2de97a JB |
5003 | * Do this so attach doesn't complain and we need to |
5004 | * drop the ref the old guy had. | |
5005 | */ | |
5006 | ClearPagePrivate(p); | |
0b32f4bb | 5007 | WARN_ON(PageDirty(p)); |
09cbfeaf | 5008 | put_page(p); |
d1310b2e | 5009 | } |
4f2de97a JB |
5010 | attach_extent_buffer_page(eb, p); |
5011 | spin_unlock(&mapping->private_lock); | |
0b32f4bb | 5012 | WARN_ON(PageDirty(p)); |
727011e0 | 5013 | eb->pages[i] = p; |
d1310b2e CM |
5014 | if (!PageUptodate(p)) |
5015 | uptodate = 0; | |
eb14ab8e CM |
5016 | |
5017 | /* | |
5018 | * see below about how we avoid a nasty race with release page | |
5019 | * and why we unlock later | |
5020 | */ | |
d1310b2e CM |
5021 | } |
5022 | if (uptodate) | |
b4ce94de | 5023 | set_bit(EXTENT_BUFFER_UPTODATE, &eb->bflags); |
115391d2 | 5024 | again: |
e1860a77 | 5025 | ret = radix_tree_preload(GFP_NOFS); |
c871b0f2 LB |
5026 | if (ret) { |
5027 | exists = ERR_PTR(ret); | |
19fe0a8b | 5028 | goto free_eb; |
c871b0f2 | 5029 | } |
19fe0a8b | 5030 | |
f28491e0 JB |
5031 | spin_lock(&fs_info->buffer_lock); |
5032 | ret = radix_tree_insert(&fs_info->buffer_radix, | |
09cbfeaf | 5033 | start >> PAGE_SHIFT, eb); |
f28491e0 | 5034 | spin_unlock(&fs_info->buffer_lock); |
452c75c3 | 5035 | radix_tree_preload_end(); |
19fe0a8b | 5036 | if (ret == -EEXIST) { |
f28491e0 | 5037 | exists = find_extent_buffer(fs_info, start); |
452c75c3 CS |
5038 | if (exists) |
5039 | goto free_eb; | |
5040 | else | |
115391d2 | 5041 | goto again; |
6af118ce | 5042 | } |
6af118ce | 5043 | /* add one reference for the tree */ |
0b32f4bb | 5044 | check_buffer_tree_ref(eb); |
34b41ace | 5045 | set_bit(EXTENT_BUFFER_IN_TREE, &eb->bflags); |
eb14ab8e CM |
5046 | |
5047 | /* | |
5048 | * there is a race where release page may have | |
5049 | * tried to find this extent buffer in the radix | |
5050 | * but failed. It will tell the VM it is safe to | |
5051 | * reclaim the, and it will clear the page private bit. | |
5052 | * We must make sure to set the page private bit properly | |
5053 | * after the extent buffer is in the radix tree so | |
5054 | * it doesn't get lost | |
5055 | */ | |
727011e0 CM |
5056 | SetPageChecked(eb->pages[0]); |
5057 | for (i = 1; i < num_pages; i++) { | |
fb85fc9a | 5058 | p = eb->pages[i]; |
727011e0 CM |
5059 | ClearPageChecked(p); |
5060 | unlock_page(p); | |
5061 | } | |
5062 | unlock_page(eb->pages[0]); | |
d1310b2e CM |
5063 | return eb; |
5064 | ||
6af118ce | 5065 | free_eb: |
5ca64f45 | 5066 | WARN_ON(!atomic_dec_and_test(&eb->refs)); |
727011e0 CM |
5067 | for (i = 0; i < num_pages; i++) { |
5068 | if (eb->pages[i]) | |
5069 | unlock_page(eb->pages[i]); | |
5070 | } | |
eb14ab8e | 5071 | |
897ca6e9 | 5072 | btrfs_release_extent_buffer(eb); |
6af118ce | 5073 | return exists; |
d1310b2e | 5074 | } |
d1310b2e | 5075 | |
3083ee2e JB |
5076 | static inline void btrfs_release_extent_buffer_rcu(struct rcu_head *head) |
5077 | { | |
5078 | struct extent_buffer *eb = | |
5079 | container_of(head, struct extent_buffer, rcu_head); | |
5080 | ||
5081 | __free_extent_buffer(eb); | |
5082 | } | |
5083 | ||
3083ee2e | 5084 | /* Expects to have eb->eb_lock already held */ |
f7a52a40 | 5085 | static int release_extent_buffer(struct extent_buffer *eb) |
3083ee2e JB |
5086 | { |
5087 | WARN_ON(atomic_read(&eb->refs) == 0); | |
5088 | if (atomic_dec_and_test(&eb->refs)) { | |
34b41ace | 5089 | if (test_and_clear_bit(EXTENT_BUFFER_IN_TREE, &eb->bflags)) { |
f28491e0 | 5090 | struct btrfs_fs_info *fs_info = eb->fs_info; |
3083ee2e | 5091 | |
815a51c7 | 5092 | spin_unlock(&eb->refs_lock); |
3083ee2e | 5093 | |
f28491e0 JB |
5094 | spin_lock(&fs_info->buffer_lock); |
5095 | radix_tree_delete(&fs_info->buffer_radix, | |
09cbfeaf | 5096 | eb->start >> PAGE_SHIFT); |
f28491e0 | 5097 | spin_unlock(&fs_info->buffer_lock); |
34b41ace JB |
5098 | } else { |
5099 | spin_unlock(&eb->refs_lock); | |
815a51c7 | 5100 | } |
3083ee2e JB |
5101 | |
5102 | /* Should be safe to release our pages at this point */ | |
a50924e3 | 5103 | btrfs_release_extent_buffer_page(eb); |
bcb7e449 JB |
5104 | #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS |
5105 | if (unlikely(test_bit(EXTENT_BUFFER_DUMMY, &eb->bflags))) { | |
5106 | __free_extent_buffer(eb); | |
5107 | return 1; | |
5108 | } | |
5109 | #endif | |
3083ee2e | 5110 | call_rcu(&eb->rcu_head, btrfs_release_extent_buffer_rcu); |
e64860aa | 5111 | return 1; |
3083ee2e JB |
5112 | } |
5113 | spin_unlock(&eb->refs_lock); | |
e64860aa JB |
5114 | |
5115 | return 0; | |
3083ee2e JB |
5116 | } |
5117 | ||
d1310b2e CM |
5118 | void free_extent_buffer(struct extent_buffer *eb) |
5119 | { | |
242e18c7 CM |
5120 | int refs; |
5121 | int old; | |
d1310b2e CM |
5122 | if (!eb) |
5123 | return; | |
5124 | ||
242e18c7 CM |
5125 | while (1) { |
5126 | refs = atomic_read(&eb->refs); | |
5127 | if (refs <= 3) | |
5128 | break; | |
5129 | old = atomic_cmpxchg(&eb->refs, refs, refs - 1); | |
5130 | if (old == refs) | |
5131 | return; | |
5132 | } | |
5133 | ||
3083ee2e | 5134 | spin_lock(&eb->refs_lock); |
815a51c7 JS |
5135 | if (atomic_read(&eb->refs) == 2 && |
5136 | test_bit(EXTENT_BUFFER_DUMMY, &eb->bflags)) | |
5137 | atomic_dec(&eb->refs); | |
5138 | ||
3083ee2e JB |
5139 | if (atomic_read(&eb->refs) == 2 && |
5140 | test_bit(EXTENT_BUFFER_STALE, &eb->bflags) && | |
0b32f4bb | 5141 | !extent_buffer_under_io(eb) && |
3083ee2e JB |
5142 | test_and_clear_bit(EXTENT_BUFFER_TREE_REF, &eb->bflags)) |
5143 | atomic_dec(&eb->refs); | |
5144 | ||
5145 | /* | |
5146 | * I know this is terrible, but it's temporary until we stop tracking | |
5147 | * the uptodate bits and such for the extent buffers. | |
5148 | */ | |
f7a52a40 | 5149 | release_extent_buffer(eb); |
3083ee2e JB |
5150 | } |
5151 | ||
5152 | void free_extent_buffer_stale(struct extent_buffer *eb) | |
5153 | { | |
5154 | if (!eb) | |
d1310b2e CM |
5155 | return; |
5156 | ||
3083ee2e JB |
5157 | spin_lock(&eb->refs_lock); |
5158 | set_bit(EXTENT_BUFFER_STALE, &eb->bflags); | |
5159 | ||
0b32f4bb | 5160 | if (atomic_read(&eb->refs) == 2 && !extent_buffer_under_io(eb) && |
3083ee2e JB |
5161 | test_and_clear_bit(EXTENT_BUFFER_TREE_REF, &eb->bflags)) |
5162 | atomic_dec(&eb->refs); | |
f7a52a40 | 5163 | release_extent_buffer(eb); |
d1310b2e | 5164 | } |
d1310b2e | 5165 | |
1d4284bd | 5166 | void clear_extent_buffer_dirty(struct extent_buffer *eb) |
d1310b2e | 5167 | { |
d1310b2e CM |
5168 | unsigned long i; |
5169 | unsigned long num_pages; | |
5170 | struct page *page; | |
5171 | ||
d1310b2e CM |
5172 | num_pages = num_extent_pages(eb->start, eb->len); |
5173 | ||
5174 | for (i = 0; i < num_pages; i++) { | |
fb85fc9a | 5175 | page = eb->pages[i]; |
b9473439 | 5176 | if (!PageDirty(page)) |
d2c3f4f6 CM |
5177 | continue; |
5178 | ||
a61e6f29 | 5179 | lock_page(page); |
eb14ab8e CM |
5180 | WARN_ON(!PagePrivate(page)); |
5181 | ||
d1310b2e | 5182 | clear_page_dirty_for_io(page); |
0ee0fda0 | 5183 | spin_lock_irq(&page->mapping->tree_lock); |
d1310b2e CM |
5184 | if (!PageDirty(page)) { |
5185 | radix_tree_tag_clear(&page->mapping->page_tree, | |
5186 | page_index(page), | |
5187 | PAGECACHE_TAG_DIRTY); | |
5188 | } | |
0ee0fda0 | 5189 | spin_unlock_irq(&page->mapping->tree_lock); |
bf0da8c1 | 5190 | ClearPageError(page); |
a61e6f29 | 5191 | unlock_page(page); |
d1310b2e | 5192 | } |
0b32f4bb | 5193 | WARN_ON(atomic_read(&eb->refs) == 0); |
d1310b2e | 5194 | } |
d1310b2e | 5195 | |
0b32f4bb | 5196 | int set_extent_buffer_dirty(struct extent_buffer *eb) |
d1310b2e CM |
5197 | { |
5198 | unsigned long i; | |
5199 | unsigned long num_pages; | |
b9473439 | 5200 | int was_dirty = 0; |
d1310b2e | 5201 | |
0b32f4bb JB |
5202 | check_buffer_tree_ref(eb); |
5203 | ||
b9473439 | 5204 | was_dirty = test_and_set_bit(EXTENT_BUFFER_DIRTY, &eb->bflags); |
0b32f4bb | 5205 | |
d1310b2e | 5206 | num_pages = num_extent_pages(eb->start, eb->len); |
3083ee2e | 5207 | WARN_ON(atomic_read(&eb->refs) == 0); |
0b32f4bb JB |
5208 | WARN_ON(!test_bit(EXTENT_BUFFER_TREE_REF, &eb->bflags)); |
5209 | ||
b9473439 | 5210 | for (i = 0; i < num_pages; i++) |
fb85fc9a | 5211 | set_page_dirty(eb->pages[i]); |
b9473439 | 5212 | return was_dirty; |
d1310b2e | 5213 | } |
d1310b2e | 5214 | |
69ba3927 | 5215 | void clear_extent_buffer_uptodate(struct extent_buffer *eb) |
1259ab75 CM |
5216 | { |
5217 | unsigned long i; | |
5218 | struct page *page; | |
5219 | unsigned long num_pages; | |
5220 | ||
b4ce94de | 5221 | clear_bit(EXTENT_BUFFER_UPTODATE, &eb->bflags); |
0b32f4bb | 5222 | num_pages = num_extent_pages(eb->start, eb->len); |
1259ab75 | 5223 | for (i = 0; i < num_pages; i++) { |
fb85fc9a | 5224 | page = eb->pages[i]; |
33958dc6 CM |
5225 | if (page) |
5226 | ClearPageUptodate(page); | |
1259ab75 | 5227 | } |
1259ab75 CM |
5228 | } |
5229 | ||
09c25a8c | 5230 | void set_extent_buffer_uptodate(struct extent_buffer *eb) |
d1310b2e CM |
5231 | { |
5232 | unsigned long i; | |
5233 | struct page *page; | |
5234 | unsigned long num_pages; | |
5235 | ||
0b32f4bb | 5236 | set_bit(EXTENT_BUFFER_UPTODATE, &eb->bflags); |
d1310b2e | 5237 | num_pages = num_extent_pages(eb->start, eb->len); |
d1310b2e | 5238 | for (i = 0; i < num_pages; i++) { |
fb85fc9a | 5239 | page = eb->pages[i]; |
d1310b2e CM |
5240 | SetPageUptodate(page); |
5241 | } | |
d1310b2e | 5242 | } |
d1310b2e | 5243 | |
0b32f4bb | 5244 | int extent_buffer_uptodate(struct extent_buffer *eb) |
d1310b2e | 5245 | { |
0b32f4bb | 5246 | return test_bit(EXTENT_BUFFER_UPTODATE, &eb->bflags); |
d1310b2e | 5247 | } |
d1310b2e CM |
5248 | |
5249 | int read_extent_buffer_pages(struct extent_io_tree *tree, | |
6af49dbd | 5250 | struct extent_buffer *eb, int wait, int mirror_num) |
d1310b2e CM |
5251 | { |
5252 | unsigned long i; | |
d1310b2e CM |
5253 | struct page *page; |
5254 | int err; | |
5255 | int ret = 0; | |
ce9adaa5 CM |
5256 | int locked_pages = 0; |
5257 | int all_uptodate = 1; | |
d1310b2e | 5258 | unsigned long num_pages; |
727011e0 | 5259 | unsigned long num_reads = 0; |
a86c12c7 | 5260 | struct bio *bio = NULL; |
c8b97818 | 5261 | unsigned long bio_flags = 0; |
a86c12c7 | 5262 | |
b4ce94de | 5263 | if (test_bit(EXTENT_BUFFER_UPTODATE, &eb->bflags)) |
d1310b2e CM |
5264 | return 0; |
5265 | ||
d1310b2e | 5266 | num_pages = num_extent_pages(eb->start, eb->len); |
8436ea91 | 5267 | for (i = 0; i < num_pages; i++) { |
fb85fc9a | 5268 | page = eb->pages[i]; |
bb82ab88 | 5269 | if (wait == WAIT_NONE) { |
2db04966 | 5270 | if (!trylock_page(page)) |
ce9adaa5 | 5271 | goto unlock_exit; |
d1310b2e CM |
5272 | } else { |
5273 | lock_page(page); | |
5274 | } | |
ce9adaa5 | 5275 | locked_pages++; |
2571e739 LB |
5276 | } |
5277 | /* | |
5278 | * We need to firstly lock all pages to make sure that | |
5279 | * the uptodate bit of our pages won't be affected by | |
5280 | * clear_extent_buffer_uptodate(). | |
5281 | */ | |
8436ea91 | 5282 | for (i = 0; i < num_pages; i++) { |
2571e739 | 5283 | page = eb->pages[i]; |
727011e0 CM |
5284 | if (!PageUptodate(page)) { |
5285 | num_reads++; | |
ce9adaa5 | 5286 | all_uptodate = 0; |
727011e0 | 5287 | } |
ce9adaa5 | 5288 | } |
2571e739 | 5289 | |
ce9adaa5 | 5290 | if (all_uptodate) { |
8436ea91 | 5291 | set_bit(EXTENT_BUFFER_UPTODATE, &eb->bflags); |
ce9adaa5 CM |
5292 | goto unlock_exit; |
5293 | } | |
5294 | ||
656f30db | 5295 | clear_bit(EXTENT_BUFFER_READ_ERR, &eb->bflags); |
5cf1ab56 | 5296 | eb->read_mirror = 0; |
0b32f4bb | 5297 | atomic_set(&eb->io_pages, num_reads); |
8436ea91 | 5298 | for (i = 0; i < num_pages; i++) { |
fb85fc9a | 5299 | page = eb->pages[i]; |
baf863b9 | 5300 | |
ce9adaa5 | 5301 | if (!PageUptodate(page)) { |
baf863b9 LB |
5302 | if (ret) { |
5303 | atomic_dec(&eb->io_pages); | |
5304 | unlock_page(page); | |
5305 | continue; | |
5306 | } | |
5307 | ||
f188591e | 5308 | ClearPageError(page); |
a86c12c7 | 5309 | err = __extent_read_full_page(tree, page, |
6af49dbd | 5310 | btree_get_extent, &bio, |
d4c7ca86 | 5311 | mirror_num, &bio_flags, |
1f7ad75b | 5312 | REQ_META); |
baf863b9 | 5313 | if (err) { |
d1310b2e | 5314 | ret = err; |
baf863b9 LB |
5315 | /* |
5316 | * We use &bio in above __extent_read_full_page, | |
5317 | * so we ensure that if it returns error, the | |
5318 | * current page fails to add itself to bio and | |
5319 | * it's been unlocked. | |
5320 | * | |
5321 | * We must dec io_pages by ourselves. | |
5322 | */ | |
5323 | atomic_dec(&eb->io_pages); | |
5324 | } | |
d1310b2e CM |
5325 | } else { |
5326 | unlock_page(page); | |
5327 | } | |
5328 | } | |
5329 | ||
355808c2 | 5330 | if (bio) { |
1f7ad75b | 5331 | err = submit_one_bio(bio, mirror_num, bio_flags); |
79787eaa JM |
5332 | if (err) |
5333 | return err; | |
355808c2 | 5334 | } |
a86c12c7 | 5335 | |
bb82ab88 | 5336 | if (ret || wait != WAIT_COMPLETE) |
d1310b2e | 5337 | return ret; |
d397712b | 5338 | |
8436ea91 | 5339 | for (i = 0; i < num_pages; i++) { |
fb85fc9a | 5340 | page = eb->pages[i]; |
d1310b2e | 5341 | wait_on_page_locked(page); |
d397712b | 5342 | if (!PageUptodate(page)) |
d1310b2e | 5343 | ret = -EIO; |
d1310b2e | 5344 | } |
d397712b | 5345 | |
d1310b2e | 5346 | return ret; |
ce9adaa5 CM |
5347 | |
5348 | unlock_exit: | |
d397712b | 5349 | while (locked_pages > 0) { |
ce9adaa5 | 5350 | locked_pages--; |
8436ea91 JB |
5351 | page = eb->pages[locked_pages]; |
5352 | unlock_page(page); | |
ce9adaa5 CM |
5353 | } |
5354 | return ret; | |
d1310b2e | 5355 | } |
d1310b2e | 5356 | |
1cbb1f45 JM |
5357 | void read_extent_buffer(const struct extent_buffer *eb, void *dstv, |
5358 | unsigned long start, unsigned long len) | |
d1310b2e CM |
5359 | { |
5360 | size_t cur; | |
5361 | size_t offset; | |
5362 | struct page *page; | |
5363 | char *kaddr; | |
5364 | char *dst = (char *)dstv; | |
09cbfeaf KS |
5365 | size_t start_offset = eb->start & ((u64)PAGE_SIZE - 1); |
5366 | unsigned long i = (start_offset + start) >> PAGE_SHIFT; | |
d1310b2e | 5367 | |
f716abd5 LB |
5368 | if (start + len > eb->len) { |
5369 | WARN(1, KERN_ERR "btrfs bad mapping eb start %llu len %lu, wanted %lu %lu\n", | |
5370 | eb->start, eb->len, start, len); | |
5371 | memset(dst, 0, len); | |
5372 | return; | |
5373 | } | |
d1310b2e | 5374 | |
09cbfeaf | 5375 | offset = (start_offset + start) & (PAGE_SIZE - 1); |
d1310b2e | 5376 | |
d397712b | 5377 | while (len > 0) { |
fb85fc9a | 5378 | page = eb->pages[i]; |
d1310b2e | 5379 | |
09cbfeaf | 5380 | cur = min(len, (PAGE_SIZE - offset)); |
a6591715 | 5381 | kaddr = page_address(page); |
d1310b2e | 5382 | memcpy(dst, kaddr + offset, cur); |
d1310b2e CM |
5383 | |
5384 | dst += cur; | |
5385 | len -= cur; | |
5386 | offset = 0; | |
5387 | i++; | |
5388 | } | |
5389 | } | |
d1310b2e | 5390 | |
1cbb1f45 JM |
5391 | int read_extent_buffer_to_user(const struct extent_buffer *eb, |
5392 | void __user *dstv, | |
5393 | unsigned long start, unsigned long len) | |
550ac1d8 GH |
5394 | { |
5395 | size_t cur; | |
5396 | size_t offset; | |
5397 | struct page *page; | |
5398 | char *kaddr; | |
5399 | char __user *dst = (char __user *)dstv; | |
09cbfeaf KS |
5400 | size_t start_offset = eb->start & ((u64)PAGE_SIZE - 1); |
5401 | unsigned long i = (start_offset + start) >> PAGE_SHIFT; | |
550ac1d8 GH |
5402 | int ret = 0; |
5403 | ||
5404 | WARN_ON(start > eb->len); | |
5405 | WARN_ON(start + len > eb->start + eb->len); | |
5406 | ||
09cbfeaf | 5407 | offset = (start_offset + start) & (PAGE_SIZE - 1); |
550ac1d8 GH |
5408 | |
5409 | while (len > 0) { | |
fb85fc9a | 5410 | page = eb->pages[i]; |
550ac1d8 | 5411 | |
09cbfeaf | 5412 | cur = min(len, (PAGE_SIZE - offset)); |
550ac1d8 GH |
5413 | kaddr = page_address(page); |
5414 | if (copy_to_user(dst, kaddr + offset, cur)) { | |
5415 | ret = -EFAULT; | |
5416 | break; | |
5417 | } | |
5418 | ||
5419 | dst += cur; | |
5420 | len -= cur; | |
5421 | offset = 0; | |
5422 | i++; | |
5423 | } | |
5424 | ||
5425 | return ret; | |
5426 | } | |
5427 | ||
415b35a5 LB |
5428 | /* |
5429 | * return 0 if the item is found within a page. | |
5430 | * return 1 if the item spans two pages. | |
5431 | * return -EINVAL otherwise. | |
5432 | */ | |
1cbb1f45 JM |
5433 | int map_private_extent_buffer(const struct extent_buffer *eb, |
5434 | unsigned long start, unsigned long min_len, | |
5435 | char **map, unsigned long *map_start, | |
5436 | unsigned long *map_len) | |
d1310b2e | 5437 | { |
09cbfeaf | 5438 | size_t offset = start & (PAGE_SIZE - 1); |
d1310b2e CM |
5439 | char *kaddr; |
5440 | struct page *p; | |
09cbfeaf KS |
5441 | size_t start_offset = eb->start & ((u64)PAGE_SIZE - 1); |
5442 | unsigned long i = (start_offset + start) >> PAGE_SHIFT; | |
d1310b2e | 5443 | unsigned long end_i = (start_offset + start + min_len - 1) >> |
09cbfeaf | 5444 | PAGE_SHIFT; |
d1310b2e | 5445 | |
f716abd5 LB |
5446 | if (start + min_len > eb->len) { |
5447 | WARN(1, KERN_ERR "btrfs bad mapping eb start %llu len %lu, wanted %lu %lu\n", | |
5448 | eb->start, eb->len, start, min_len); | |
5449 | return -EINVAL; | |
5450 | } | |
5451 | ||
d1310b2e | 5452 | if (i != end_i) |
415b35a5 | 5453 | return 1; |
d1310b2e CM |
5454 | |
5455 | if (i == 0) { | |
5456 | offset = start_offset; | |
5457 | *map_start = 0; | |
5458 | } else { | |
5459 | offset = 0; | |
09cbfeaf | 5460 | *map_start = ((u64)i << PAGE_SHIFT) - start_offset; |
d1310b2e | 5461 | } |
d397712b | 5462 | |
fb85fc9a | 5463 | p = eb->pages[i]; |
a6591715 | 5464 | kaddr = page_address(p); |
d1310b2e | 5465 | *map = kaddr + offset; |
09cbfeaf | 5466 | *map_len = PAGE_SIZE - offset; |
d1310b2e CM |
5467 | return 0; |
5468 | } | |
d1310b2e | 5469 | |
1cbb1f45 JM |
5470 | int memcmp_extent_buffer(const struct extent_buffer *eb, const void *ptrv, |
5471 | unsigned long start, unsigned long len) | |
d1310b2e CM |
5472 | { |
5473 | size_t cur; | |
5474 | size_t offset; | |
5475 | struct page *page; | |
5476 | char *kaddr; | |
5477 | char *ptr = (char *)ptrv; | |
09cbfeaf KS |
5478 | size_t start_offset = eb->start & ((u64)PAGE_SIZE - 1); |
5479 | unsigned long i = (start_offset + start) >> PAGE_SHIFT; | |
d1310b2e CM |
5480 | int ret = 0; |
5481 | ||
5482 | WARN_ON(start > eb->len); | |
5483 | WARN_ON(start + len > eb->start + eb->len); | |
5484 | ||
09cbfeaf | 5485 | offset = (start_offset + start) & (PAGE_SIZE - 1); |
d1310b2e | 5486 | |
d397712b | 5487 | while (len > 0) { |
fb85fc9a | 5488 | page = eb->pages[i]; |
d1310b2e | 5489 | |
09cbfeaf | 5490 | cur = min(len, (PAGE_SIZE - offset)); |
d1310b2e | 5491 | |
a6591715 | 5492 | kaddr = page_address(page); |
d1310b2e | 5493 | ret = memcmp(ptr, kaddr + offset, cur); |
d1310b2e CM |
5494 | if (ret) |
5495 | break; | |
5496 | ||
5497 | ptr += cur; | |
5498 | len -= cur; | |
5499 | offset = 0; | |
5500 | i++; | |
5501 | } | |
5502 | return ret; | |
5503 | } | |
d1310b2e | 5504 | |
f157bf76 DS |
5505 | void write_extent_buffer_chunk_tree_uuid(struct extent_buffer *eb, |
5506 | const void *srcv) | |
5507 | { | |
5508 | char *kaddr; | |
5509 | ||
5510 | WARN_ON(!PageUptodate(eb->pages[0])); | |
5511 | kaddr = page_address(eb->pages[0]); | |
5512 | memcpy(kaddr + offsetof(struct btrfs_header, chunk_tree_uuid), srcv, | |
5513 | BTRFS_FSID_SIZE); | |
5514 | } | |
5515 | ||
5516 | void write_extent_buffer_fsid(struct extent_buffer *eb, const void *srcv) | |
5517 | { | |
5518 | char *kaddr; | |
5519 | ||
5520 | WARN_ON(!PageUptodate(eb->pages[0])); | |
5521 | kaddr = page_address(eb->pages[0]); | |
5522 | memcpy(kaddr + offsetof(struct btrfs_header, fsid), srcv, | |
5523 | BTRFS_FSID_SIZE); | |
5524 | } | |
5525 | ||
d1310b2e CM |
5526 | void write_extent_buffer(struct extent_buffer *eb, const void *srcv, |
5527 | unsigned long start, unsigned long len) | |
5528 | { | |
5529 | size_t cur; | |
5530 | size_t offset; | |
5531 | struct page *page; | |
5532 | char *kaddr; | |
5533 | char *src = (char *)srcv; | |
09cbfeaf KS |
5534 | size_t start_offset = eb->start & ((u64)PAGE_SIZE - 1); |
5535 | unsigned long i = (start_offset + start) >> PAGE_SHIFT; | |
d1310b2e CM |
5536 | |
5537 | WARN_ON(start > eb->len); | |
5538 | WARN_ON(start + len > eb->start + eb->len); | |
5539 | ||
09cbfeaf | 5540 | offset = (start_offset + start) & (PAGE_SIZE - 1); |
d1310b2e | 5541 | |
d397712b | 5542 | while (len > 0) { |
fb85fc9a | 5543 | page = eb->pages[i]; |
d1310b2e CM |
5544 | WARN_ON(!PageUptodate(page)); |
5545 | ||
09cbfeaf | 5546 | cur = min(len, PAGE_SIZE - offset); |
a6591715 | 5547 | kaddr = page_address(page); |
d1310b2e | 5548 | memcpy(kaddr + offset, src, cur); |
d1310b2e CM |
5549 | |
5550 | src += cur; | |
5551 | len -= cur; | |
5552 | offset = 0; | |
5553 | i++; | |
5554 | } | |
5555 | } | |
d1310b2e | 5556 | |
b159fa28 DS |
5557 | void memzero_extent_buffer(struct extent_buffer *eb, unsigned long start, |
5558 | unsigned long len) | |
d1310b2e CM |
5559 | { |
5560 | size_t cur; | |
5561 | size_t offset; | |
5562 | struct page *page; | |
5563 | char *kaddr; | |
09cbfeaf KS |
5564 | size_t start_offset = eb->start & ((u64)PAGE_SIZE - 1); |
5565 | unsigned long i = (start_offset + start) >> PAGE_SHIFT; | |
d1310b2e CM |
5566 | |
5567 | WARN_ON(start > eb->len); | |
5568 | WARN_ON(start + len > eb->start + eb->len); | |
5569 | ||
09cbfeaf | 5570 | offset = (start_offset + start) & (PAGE_SIZE - 1); |
d1310b2e | 5571 | |
d397712b | 5572 | while (len > 0) { |
fb85fc9a | 5573 | page = eb->pages[i]; |
d1310b2e CM |
5574 | WARN_ON(!PageUptodate(page)); |
5575 | ||
09cbfeaf | 5576 | cur = min(len, PAGE_SIZE - offset); |
a6591715 | 5577 | kaddr = page_address(page); |
b159fa28 | 5578 | memset(kaddr + offset, 0, cur); |
d1310b2e CM |
5579 | |
5580 | len -= cur; | |
5581 | offset = 0; | |
5582 | i++; | |
5583 | } | |
5584 | } | |
d1310b2e | 5585 | |
58e8012c DS |
5586 | void copy_extent_buffer_full(struct extent_buffer *dst, |
5587 | struct extent_buffer *src) | |
5588 | { | |
5589 | int i; | |
5590 | unsigned num_pages; | |
5591 | ||
5592 | ASSERT(dst->len == src->len); | |
5593 | ||
5594 | num_pages = num_extent_pages(dst->start, dst->len); | |
5595 | for (i = 0; i < num_pages; i++) | |
5596 | copy_page(page_address(dst->pages[i]), | |
5597 | page_address(src->pages[i])); | |
5598 | } | |
5599 | ||
d1310b2e CM |
5600 | void copy_extent_buffer(struct extent_buffer *dst, struct extent_buffer *src, |
5601 | unsigned long dst_offset, unsigned long src_offset, | |
5602 | unsigned long len) | |
5603 | { | |
5604 | u64 dst_len = dst->len; | |
5605 | size_t cur; | |
5606 | size_t offset; | |
5607 | struct page *page; | |
5608 | char *kaddr; | |
09cbfeaf KS |
5609 | size_t start_offset = dst->start & ((u64)PAGE_SIZE - 1); |
5610 | unsigned long i = (start_offset + dst_offset) >> PAGE_SHIFT; | |
d1310b2e CM |
5611 | |
5612 | WARN_ON(src->len != dst_len); | |
5613 | ||
5614 | offset = (start_offset + dst_offset) & | |
09cbfeaf | 5615 | (PAGE_SIZE - 1); |
d1310b2e | 5616 | |
d397712b | 5617 | while (len > 0) { |
fb85fc9a | 5618 | page = dst->pages[i]; |
d1310b2e CM |
5619 | WARN_ON(!PageUptodate(page)); |
5620 | ||
09cbfeaf | 5621 | cur = min(len, (unsigned long)(PAGE_SIZE - offset)); |
d1310b2e | 5622 | |
a6591715 | 5623 | kaddr = page_address(page); |
d1310b2e | 5624 | read_extent_buffer(src, kaddr + offset, src_offset, cur); |
d1310b2e CM |
5625 | |
5626 | src_offset += cur; | |
5627 | len -= cur; | |
5628 | offset = 0; | |
5629 | i++; | |
5630 | } | |
5631 | } | |
d1310b2e | 5632 | |
2fe1d551 OS |
5633 | void le_bitmap_set(u8 *map, unsigned int start, int len) |
5634 | { | |
5635 | u8 *p = map + BIT_BYTE(start); | |
5636 | const unsigned int size = start + len; | |
5637 | int bits_to_set = BITS_PER_BYTE - (start % BITS_PER_BYTE); | |
5638 | u8 mask_to_set = BITMAP_FIRST_BYTE_MASK(start); | |
5639 | ||
5640 | while (len - bits_to_set >= 0) { | |
5641 | *p |= mask_to_set; | |
5642 | len -= bits_to_set; | |
5643 | bits_to_set = BITS_PER_BYTE; | |
9c894696 | 5644 | mask_to_set = ~0; |
2fe1d551 OS |
5645 | p++; |
5646 | } | |
5647 | if (len) { | |
5648 | mask_to_set &= BITMAP_LAST_BYTE_MASK(size); | |
5649 | *p |= mask_to_set; | |
5650 | } | |
5651 | } | |
5652 | ||
5653 | void le_bitmap_clear(u8 *map, unsigned int start, int len) | |
5654 | { | |
5655 | u8 *p = map + BIT_BYTE(start); | |
5656 | const unsigned int size = start + len; | |
5657 | int bits_to_clear = BITS_PER_BYTE - (start % BITS_PER_BYTE); | |
5658 | u8 mask_to_clear = BITMAP_FIRST_BYTE_MASK(start); | |
5659 | ||
5660 | while (len - bits_to_clear >= 0) { | |
5661 | *p &= ~mask_to_clear; | |
5662 | len -= bits_to_clear; | |
5663 | bits_to_clear = BITS_PER_BYTE; | |
9c894696 | 5664 | mask_to_clear = ~0; |
2fe1d551 OS |
5665 | p++; |
5666 | } | |
5667 | if (len) { | |
5668 | mask_to_clear &= BITMAP_LAST_BYTE_MASK(size); | |
5669 | *p &= ~mask_to_clear; | |
5670 | } | |
5671 | } | |
3e1e8bb7 OS |
5672 | |
5673 | /* | |
5674 | * eb_bitmap_offset() - calculate the page and offset of the byte containing the | |
5675 | * given bit number | |
5676 | * @eb: the extent buffer | |
5677 | * @start: offset of the bitmap item in the extent buffer | |
5678 | * @nr: bit number | |
5679 | * @page_index: return index of the page in the extent buffer that contains the | |
5680 | * given bit number | |
5681 | * @page_offset: return offset into the page given by page_index | |
5682 | * | |
5683 | * This helper hides the ugliness of finding the byte in an extent buffer which | |
5684 | * contains a given bit. | |
5685 | */ | |
5686 | static inline void eb_bitmap_offset(struct extent_buffer *eb, | |
5687 | unsigned long start, unsigned long nr, | |
5688 | unsigned long *page_index, | |
5689 | size_t *page_offset) | |
5690 | { | |
09cbfeaf | 5691 | size_t start_offset = eb->start & ((u64)PAGE_SIZE - 1); |
3e1e8bb7 OS |
5692 | size_t byte_offset = BIT_BYTE(nr); |
5693 | size_t offset; | |
5694 | ||
5695 | /* | |
5696 | * The byte we want is the offset of the extent buffer + the offset of | |
5697 | * the bitmap item in the extent buffer + the offset of the byte in the | |
5698 | * bitmap item. | |
5699 | */ | |
5700 | offset = start_offset + start + byte_offset; | |
5701 | ||
09cbfeaf KS |
5702 | *page_index = offset >> PAGE_SHIFT; |
5703 | *page_offset = offset & (PAGE_SIZE - 1); | |
3e1e8bb7 OS |
5704 | } |
5705 | ||
5706 | /** | |
5707 | * extent_buffer_test_bit - determine whether a bit in a bitmap item is set | |
5708 | * @eb: the extent buffer | |
5709 | * @start: offset of the bitmap item in the extent buffer | |
5710 | * @nr: bit number to test | |
5711 | */ | |
5712 | int extent_buffer_test_bit(struct extent_buffer *eb, unsigned long start, | |
5713 | unsigned long nr) | |
5714 | { | |
2fe1d551 | 5715 | u8 *kaddr; |
3e1e8bb7 OS |
5716 | struct page *page; |
5717 | unsigned long i; | |
5718 | size_t offset; | |
5719 | ||
5720 | eb_bitmap_offset(eb, start, nr, &i, &offset); | |
5721 | page = eb->pages[i]; | |
5722 | WARN_ON(!PageUptodate(page)); | |
5723 | kaddr = page_address(page); | |
5724 | return 1U & (kaddr[offset] >> (nr & (BITS_PER_BYTE - 1))); | |
5725 | } | |
5726 | ||
5727 | /** | |
5728 | * extent_buffer_bitmap_set - set an area of a bitmap | |
5729 | * @eb: the extent buffer | |
5730 | * @start: offset of the bitmap item in the extent buffer | |
5731 | * @pos: bit number of the first bit | |
5732 | * @len: number of bits to set | |
5733 | */ | |
5734 | void extent_buffer_bitmap_set(struct extent_buffer *eb, unsigned long start, | |
5735 | unsigned long pos, unsigned long len) | |
5736 | { | |
2fe1d551 | 5737 | u8 *kaddr; |
3e1e8bb7 OS |
5738 | struct page *page; |
5739 | unsigned long i; | |
5740 | size_t offset; | |
5741 | const unsigned int size = pos + len; | |
5742 | int bits_to_set = BITS_PER_BYTE - (pos % BITS_PER_BYTE); | |
2fe1d551 | 5743 | u8 mask_to_set = BITMAP_FIRST_BYTE_MASK(pos); |
3e1e8bb7 OS |
5744 | |
5745 | eb_bitmap_offset(eb, start, pos, &i, &offset); | |
5746 | page = eb->pages[i]; | |
5747 | WARN_ON(!PageUptodate(page)); | |
5748 | kaddr = page_address(page); | |
5749 | ||
5750 | while (len >= bits_to_set) { | |
5751 | kaddr[offset] |= mask_to_set; | |
5752 | len -= bits_to_set; | |
5753 | bits_to_set = BITS_PER_BYTE; | |
9c894696 | 5754 | mask_to_set = ~0; |
09cbfeaf | 5755 | if (++offset >= PAGE_SIZE && len > 0) { |
3e1e8bb7 OS |
5756 | offset = 0; |
5757 | page = eb->pages[++i]; | |
5758 | WARN_ON(!PageUptodate(page)); | |
5759 | kaddr = page_address(page); | |
5760 | } | |
5761 | } | |
5762 | if (len) { | |
5763 | mask_to_set &= BITMAP_LAST_BYTE_MASK(size); | |
5764 | kaddr[offset] |= mask_to_set; | |
5765 | } | |
5766 | } | |
5767 | ||
5768 | ||
5769 | /** | |
5770 | * extent_buffer_bitmap_clear - clear an area of a bitmap | |
5771 | * @eb: the extent buffer | |
5772 | * @start: offset of the bitmap item in the extent buffer | |
5773 | * @pos: bit number of the first bit | |
5774 | * @len: number of bits to clear | |
5775 | */ | |
5776 | void extent_buffer_bitmap_clear(struct extent_buffer *eb, unsigned long start, | |
5777 | unsigned long pos, unsigned long len) | |
5778 | { | |
2fe1d551 | 5779 | u8 *kaddr; |
3e1e8bb7 OS |
5780 | struct page *page; |
5781 | unsigned long i; | |
5782 | size_t offset; | |
5783 | const unsigned int size = pos + len; | |
5784 | int bits_to_clear = BITS_PER_BYTE - (pos % BITS_PER_BYTE); | |
2fe1d551 | 5785 | u8 mask_to_clear = BITMAP_FIRST_BYTE_MASK(pos); |
3e1e8bb7 OS |
5786 | |
5787 | eb_bitmap_offset(eb, start, pos, &i, &offset); | |
5788 | page = eb->pages[i]; | |
5789 | WARN_ON(!PageUptodate(page)); | |
5790 | kaddr = page_address(page); | |
5791 | ||
5792 | while (len >= bits_to_clear) { | |
5793 | kaddr[offset] &= ~mask_to_clear; | |
5794 | len -= bits_to_clear; | |
5795 | bits_to_clear = BITS_PER_BYTE; | |
9c894696 | 5796 | mask_to_clear = ~0; |
09cbfeaf | 5797 | if (++offset >= PAGE_SIZE && len > 0) { |
3e1e8bb7 OS |
5798 | offset = 0; |
5799 | page = eb->pages[++i]; | |
5800 | WARN_ON(!PageUptodate(page)); | |
5801 | kaddr = page_address(page); | |
5802 | } | |
5803 | } | |
5804 | if (len) { | |
5805 | mask_to_clear &= BITMAP_LAST_BYTE_MASK(size); | |
5806 | kaddr[offset] &= ~mask_to_clear; | |
5807 | } | |
5808 | } | |
5809 | ||
3387206f ST |
5810 | static inline bool areas_overlap(unsigned long src, unsigned long dst, unsigned long len) |
5811 | { | |
5812 | unsigned long distance = (src > dst) ? src - dst : dst - src; | |
5813 | return distance < len; | |
5814 | } | |
5815 | ||
d1310b2e CM |
5816 | static void copy_pages(struct page *dst_page, struct page *src_page, |
5817 | unsigned long dst_off, unsigned long src_off, | |
5818 | unsigned long len) | |
5819 | { | |
a6591715 | 5820 | char *dst_kaddr = page_address(dst_page); |
d1310b2e | 5821 | char *src_kaddr; |
727011e0 | 5822 | int must_memmove = 0; |
d1310b2e | 5823 | |
3387206f | 5824 | if (dst_page != src_page) { |
a6591715 | 5825 | src_kaddr = page_address(src_page); |
3387206f | 5826 | } else { |
d1310b2e | 5827 | src_kaddr = dst_kaddr; |
727011e0 CM |
5828 | if (areas_overlap(src_off, dst_off, len)) |
5829 | must_memmove = 1; | |
3387206f | 5830 | } |
d1310b2e | 5831 | |
727011e0 CM |
5832 | if (must_memmove) |
5833 | memmove(dst_kaddr + dst_off, src_kaddr + src_off, len); | |
5834 | else | |
5835 | memcpy(dst_kaddr + dst_off, src_kaddr + src_off, len); | |
d1310b2e CM |
5836 | } |
5837 | ||
5838 | void memcpy_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset, | |
5839 | unsigned long src_offset, unsigned long len) | |
5840 | { | |
0b246afa | 5841 | struct btrfs_fs_info *fs_info = dst->fs_info; |
d1310b2e CM |
5842 | size_t cur; |
5843 | size_t dst_off_in_page; | |
5844 | size_t src_off_in_page; | |
09cbfeaf | 5845 | size_t start_offset = dst->start & ((u64)PAGE_SIZE - 1); |
d1310b2e CM |
5846 | unsigned long dst_i; |
5847 | unsigned long src_i; | |
5848 | ||
5849 | if (src_offset + len > dst->len) { | |
0b246afa | 5850 | btrfs_err(fs_info, |
5d163e0e JM |
5851 | "memmove bogus src_offset %lu move len %lu dst len %lu", |
5852 | src_offset, len, dst->len); | |
d1310b2e CM |
5853 | BUG_ON(1); |
5854 | } | |
5855 | if (dst_offset + len > dst->len) { | |
0b246afa | 5856 | btrfs_err(fs_info, |
5d163e0e JM |
5857 | "memmove bogus dst_offset %lu move len %lu dst len %lu", |
5858 | dst_offset, len, dst->len); | |
d1310b2e CM |
5859 | BUG_ON(1); |
5860 | } | |
5861 | ||
d397712b | 5862 | while (len > 0) { |
d1310b2e | 5863 | dst_off_in_page = (start_offset + dst_offset) & |
09cbfeaf | 5864 | (PAGE_SIZE - 1); |
d1310b2e | 5865 | src_off_in_page = (start_offset + src_offset) & |
09cbfeaf | 5866 | (PAGE_SIZE - 1); |
d1310b2e | 5867 | |
09cbfeaf KS |
5868 | dst_i = (start_offset + dst_offset) >> PAGE_SHIFT; |
5869 | src_i = (start_offset + src_offset) >> PAGE_SHIFT; | |
d1310b2e | 5870 | |
09cbfeaf | 5871 | cur = min(len, (unsigned long)(PAGE_SIZE - |
d1310b2e CM |
5872 | src_off_in_page)); |
5873 | cur = min_t(unsigned long, cur, | |
09cbfeaf | 5874 | (unsigned long)(PAGE_SIZE - dst_off_in_page)); |
d1310b2e | 5875 | |
fb85fc9a | 5876 | copy_pages(dst->pages[dst_i], dst->pages[src_i], |
d1310b2e CM |
5877 | dst_off_in_page, src_off_in_page, cur); |
5878 | ||
5879 | src_offset += cur; | |
5880 | dst_offset += cur; | |
5881 | len -= cur; | |
5882 | } | |
5883 | } | |
d1310b2e CM |
5884 | |
5885 | void memmove_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset, | |
5886 | unsigned long src_offset, unsigned long len) | |
5887 | { | |
0b246afa | 5888 | struct btrfs_fs_info *fs_info = dst->fs_info; |
d1310b2e CM |
5889 | size_t cur; |
5890 | size_t dst_off_in_page; | |
5891 | size_t src_off_in_page; | |
5892 | unsigned long dst_end = dst_offset + len - 1; | |
5893 | unsigned long src_end = src_offset + len - 1; | |
09cbfeaf | 5894 | size_t start_offset = dst->start & ((u64)PAGE_SIZE - 1); |
d1310b2e CM |
5895 | unsigned long dst_i; |
5896 | unsigned long src_i; | |
5897 | ||
5898 | if (src_offset + len > dst->len) { | |
0b246afa | 5899 | btrfs_err(fs_info, |
5d163e0e JM |
5900 | "memmove bogus src_offset %lu move len %lu len %lu", |
5901 | src_offset, len, dst->len); | |
d1310b2e CM |
5902 | BUG_ON(1); |
5903 | } | |
5904 | if (dst_offset + len > dst->len) { | |
0b246afa | 5905 | btrfs_err(fs_info, |
5d163e0e JM |
5906 | "memmove bogus dst_offset %lu move len %lu len %lu", |
5907 | dst_offset, len, dst->len); | |
d1310b2e CM |
5908 | BUG_ON(1); |
5909 | } | |
727011e0 | 5910 | if (dst_offset < src_offset) { |
d1310b2e CM |
5911 | memcpy_extent_buffer(dst, dst_offset, src_offset, len); |
5912 | return; | |
5913 | } | |
d397712b | 5914 | while (len > 0) { |
09cbfeaf KS |
5915 | dst_i = (start_offset + dst_end) >> PAGE_SHIFT; |
5916 | src_i = (start_offset + src_end) >> PAGE_SHIFT; | |
d1310b2e CM |
5917 | |
5918 | dst_off_in_page = (start_offset + dst_end) & | |
09cbfeaf | 5919 | (PAGE_SIZE - 1); |
d1310b2e | 5920 | src_off_in_page = (start_offset + src_end) & |
09cbfeaf | 5921 | (PAGE_SIZE - 1); |
d1310b2e CM |
5922 | |
5923 | cur = min_t(unsigned long, len, src_off_in_page + 1); | |
5924 | cur = min(cur, dst_off_in_page + 1); | |
fb85fc9a | 5925 | copy_pages(dst->pages[dst_i], dst->pages[src_i], |
d1310b2e CM |
5926 | dst_off_in_page - cur + 1, |
5927 | src_off_in_page - cur + 1, cur); | |
5928 | ||
5929 | dst_end -= cur; | |
5930 | src_end -= cur; | |
5931 | len -= cur; | |
5932 | } | |
5933 | } | |
6af118ce | 5934 | |
f7a52a40 | 5935 | int try_release_extent_buffer(struct page *page) |
19fe0a8b | 5936 | { |
6af118ce | 5937 | struct extent_buffer *eb; |
6af118ce | 5938 | |
3083ee2e | 5939 | /* |
01327610 | 5940 | * We need to make sure nobody is attaching this page to an eb right |
3083ee2e JB |
5941 | * now. |
5942 | */ | |
5943 | spin_lock(&page->mapping->private_lock); | |
5944 | if (!PagePrivate(page)) { | |
5945 | spin_unlock(&page->mapping->private_lock); | |
4f2de97a | 5946 | return 1; |
45f49bce | 5947 | } |
6af118ce | 5948 | |
3083ee2e JB |
5949 | eb = (struct extent_buffer *)page->private; |
5950 | BUG_ON(!eb); | |
19fe0a8b MX |
5951 | |
5952 | /* | |
3083ee2e JB |
5953 | * This is a little awful but should be ok, we need to make sure that |
5954 | * the eb doesn't disappear out from under us while we're looking at | |
5955 | * this page. | |
19fe0a8b | 5956 | */ |
3083ee2e | 5957 | spin_lock(&eb->refs_lock); |
0b32f4bb | 5958 | if (atomic_read(&eb->refs) != 1 || extent_buffer_under_io(eb)) { |
3083ee2e JB |
5959 | spin_unlock(&eb->refs_lock); |
5960 | spin_unlock(&page->mapping->private_lock); | |
5961 | return 0; | |
b9473439 | 5962 | } |
3083ee2e | 5963 | spin_unlock(&page->mapping->private_lock); |
897ca6e9 | 5964 | |
19fe0a8b | 5965 | /* |
3083ee2e JB |
5966 | * If tree ref isn't set then we know the ref on this eb is a real ref, |
5967 | * so just return, this page will likely be freed soon anyway. | |
19fe0a8b | 5968 | */ |
3083ee2e JB |
5969 | if (!test_and_clear_bit(EXTENT_BUFFER_TREE_REF, &eb->bflags)) { |
5970 | spin_unlock(&eb->refs_lock); | |
5971 | return 0; | |
b9473439 | 5972 | } |
19fe0a8b | 5973 | |
f7a52a40 | 5974 | return release_extent_buffer(eb); |
6af118ce | 5975 | } |