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Commit | Line | Data |
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d1310b2e CM |
1 | #include <linux/bitops.h> |
2 | #include <linux/slab.h> | |
3 | #include <linux/bio.h> | |
4 | #include <linux/mm.h> | |
d1310b2e CM |
5 | #include <linux/pagemap.h> |
6 | #include <linux/page-flags.h> | |
d1310b2e CM |
7 | #include <linux/spinlock.h> |
8 | #include <linux/blkdev.h> | |
9 | #include <linux/swap.h> | |
d1310b2e CM |
10 | #include <linux/writeback.h> |
11 | #include <linux/pagevec.h> | |
268bb0ce | 12 | #include <linux/prefetch.h> |
90a887c9 | 13 | #include <linux/cleancache.h> |
d1310b2e CM |
14 | #include "extent_io.h" |
15 | #include "extent_map.h" | |
902b22f3 DW |
16 | #include "ctree.h" |
17 | #include "btrfs_inode.h" | |
4a54c8c1 | 18 | #include "volumes.h" |
21adbd5c | 19 | #include "check-integrity.h" |
0b32f4bb | 20 | #include "locking.h" |
606686ee | 21 | #include "rcu-string.h" |
fe09e16c | 22 | #include "backref.h" |
afce772e | 23 | #include "transaction.h" |
d1310b2e | 24 | |
d1310b2e CM |
25 | static struct kmem_cache *extent_state_cache; |
26 | static struct kmem_cache *extent_buffer_cache; | |
9be3395b | 27 | static struct bio_set *btrfs_bioset; |
d1310b2e | 28 | |
27a3507d FM |
29 | static inline bool extent_state_in_tree(const struct extent_state *state) |
30 | { | |
31 | return !RB_EMPTY_NODE(&state->rb_node); | |
32 | } | |
33 | ||
6d49ba1b | 34 | #ifdef CONFIG_BTRFS_DEBUG |
d1310b2e CM |
35 | static LIST_HEAD(buffers); |
36 | static LIST_HEAD(states); | |
4bef0848 | 37 | |
d397712b | 38 | static DEFINE_SPINLOCK(leak_lock); |
6d49ba1b ES |
39 | |
40 | static inline | |
41 | void btrfs_leak_debug_add(struct list_head *new, struct list_head *head) | |
42 | { | |
43 | unsigned long flags; | |
44 | ||
45 | spin_lock_irqsave(&leak_lock, flags); | |
46 | list_add(new, head); | |
47 | spin_unlock_irqrestore(&leak_lock, flags); | |
48 | } | |
49 | ||
50 | static inline | |
51 | void btrfs_leak_debug_del(struct list_head *entry) | |
52 | { | |
53 | unsigned long flags; | |
54 | ||
55 | spin_lock_irqsave(&leak_lock, flags); | |
56 | list_del(entry); | |
57 | spin_unlock_irqrestore(&leak_lock, flags); | |
58 | } | |
59 | ||
60 | static inline | |
61 | void btrfs_leak_debug_check(void) | |
62 | { | |
63 | struct extent_state *state; | |
64 | struct extent_buffer *eb; | |
65 | ||
66 | while (!list_empty(&states)) { | |
67 | state = list_entry(states.next, struct extent_state, leak_list); | |
9ee49a04 | 68 | pr_err("BTRFS: state leak: start %llu end %llu state %u in tree %d refs %d\n", |
27a3507d FM |
69 | state->start, state->end, state->state, |
70 | extent_state_in_tree(state), | |
b7ac31b7 | 71 | refcount_read(&state->refs)); |
6d49ba1b ES |
72 | list_del(&state->leak_list); |
73 | kmem_cache_free(extent_state_cache, state); | |
74 | } | |
75 | ||
76 | while (!list_empty(&buffers)) { | |
77 | eb = list_entry(buffers.next, struct extent_buffer, leak_list); | |
62e85577 | 78 | pr_err("BTRFS: buffer leak start %llu len %lu refs %d\n", |
c1c9ff7c | 79 | eb->start, eb->len, atomic_read(&eb->refs)); |
6d49ba1b ES |
80 | list_del(&eb->leak_list); |
81 | kmem_cache_free(extent_buffer_cache, eb); | |
82 | } | |
83 | } | |
8d599ae1 | 84 | |
a5dee37d JB |
85 | #define btrfs_debug_check_extent_io_range(tree, start, end) \ |
86 | __btrfs_debug_check_extent_io_range(__func__, (tree), (start), (end)) | |
8d599ae1 | 87 | static inline void __btrfs_debug_check_extent_io_range(const char *caller, |
a5dee37d | 88 | struct extent_io_tree *tree, u64 start, u64 end) |
8d599ae1 | 89 | { |
a5dee37d JB |
90 | struct inode *inode; |
91 | u64 isize; | |
8d599ae1 | 92 | |
a5dee37d JB |
93 | if (!tree->mapping) |
94 | return; | |
8d599ae1 | 95 | |
a5dee37d JB |
96 | inode = tree->mapping->host; |
97 | isize = i_size_read(inode); | |
8d599ae1 | 98 | if (end >= PAGE_SIZE && (end % 2) == 0 && end != isize - 1) { |
94647322 DS |
99 | btrfs_debug_rl(BTRFS_I(inode)->root->fs_info, |
100 | "%s: ino %llu isize %llu odd range [%llu,%llu]", | |
f85b7379 | 101 | caller, btrfs_ino(BTRFS_I(inode)), isize, start, end); |
8d599ae1 DS |
102 | } |
103 | } | |
6d49ba1b ES |
104 | #else |
105 | #define btrfs_leak_debug_add(new, head) do {} while (0) | |
106 | #define btrfs_leak_debug_del(entry) do {} while (0) | |
107 | #define btrfs_leak_debug_check() do {} while (0) | |
8d599ae1 | 108 | #define btrfs_debug_check_extent_io_range(c, s, e) do {} while (0) |
4bef0848 | 109 | #endif |
d1310b2e | 110 | |
d1310b2e CM |
111 | #define BUFFER_LRU_MAX 64 |
112 | ||
113 | struct tree_entry { | |
114 | u64 start; | |
115 | u64 end; | |
d1310b2e CM |
116 | struct rb_node rb_node; |
117 | }; | |
118 | ||
119 | struct extent_page_data { | |
120 | struct bio *bio; | |
121 | struct extent_io_tree *tree; | |
122 | get_extent_t *get_extent; | |
de0022b9 | 123 | unsigned long bio_flags; |
771ed689 CM |
124 | |
125 | /* tells writepage not to lock the state bits for this range | |
126 | * it still does the unlocking | |
127 | */ | |
ffbd517d CM |
128 | unsigned int extent_locked:1; |
129 | ||
70fd7614 | 130 | /* tells the submit_bio code to use REQ_SYNC */ |
ffbd517d | 131 | unsigned int sync_io:1; |
d1310b2e CM |
132 | }; |
133 | ||
d38ed27f QW |
134 | static void add_extent_changeset(struct extent_state *state, unsigned bits, |
135 | struct extent_changeset *changeset, | |
136 | int set) | |
137 | { | |
138 | int ret; | |
139 | ||
140 | if (!changeset) | |
141 | return; | |
142 | if (set && (state->state & bits) == bits) | |
143 | return; | |
fefdc557 QW |
144 | if (!set && (state->state & bits) == 0) |
145 | return; | |
d38ed27f | 146 | changeset->bytes_changed += state->end - state->start + 1; |
53d32359 | 147 | ret = ulist_add(&changeset->range_changed, state->start, state->end, |
d38ed27f QW |
148 | GFP_ATOMIC); |
149 | /* ENOMEM */ | |
150 | BUG_ON(ret < 0); | |
151 | } | |
152 | ||
0b32f4bb | 153 | static noinline void flush_write_bio(void *data); |
c2d904e0 JM |
154 | static inline struct btrfs_fs_info * |
155 | tree_fs_info(struct extent_io_tree *tree) | |
156 | { | |
a5dee37d JB |
157 | if (!tree->mapping) |
158 | return NULL; | |
c2d904e0 JM |
159 | return btrfs_sb(tree->mapping->host->i_sb); |
160 | } | |
0b32f4bb | 161 | |
d1310b2e CM |
162 | int __init extent_io_init(void) |
163 | { | |
837e1972 | 164 | extent_state_cache = kmem_cache_create("btrfs_extent_state", |
9601e3f6 | 165 | sizeof(struct extent_state), 0, |
fba4b697 | 166 | SLAB_MEM_SPREAD, NULL); |
d1310b2e CM |
167 | if (!extent_state_cache) |
168 | return -ENOMEM; | |
169 | ||
837e1972 | 170 | extent_buffer_cache = kmem_cache_create("btrfs_extent_buffer", |
9601e3f6 | 171 | sizeof(struct extent_buffer), 0, |
fba4b697 | 172 | SLAB_MEM_SPREAD, NULL); |
d1310b2e CM |
173 | if (!extent_buffer_cache) |
174 | goto free_state_cache; | |
9be3395b CM |
175 | |
176 | btrfs_bioset = bioset_create(BIO_POOL_SIZE, | |
177 | offsetof(struct btrfs_io_bio, bio)); | |
178 | if (!btrfs_bioset) | |
179 | goto free_buffer_cache; | |
b208c2f7 DW |
180 | |
181 | if (bioset_integrity_create(btrfs_bioset, BIO_POOL_SIZE)) | |
182 | goto free_bioset; | |
183 | ||
d1310b2e CM |
184 | return 0; |
185 | ||
b208c2f7 DW |
186 | free_bioset: |
187 | bioset_free(btrfs_bioset); | |
188 | btrfs_bioset = NULL; | |
189 | ||
9be3395b CM |
190 | free_buffer_cache: |
191 | kmem_cache_destroy(extent_buffer_cache); | |
192 | extent_buffer_cache = NULL; | |
193 | ||
d1310b2e CM |
194 | free_state_cache: |
195 | kmem_cache_destroy(extent_state_cache); | |
9be3395b | 196 | extent_state_cache = NULL; |
d1310b2e CM |
197 | return -ENOMEM; |
198 | } | |
199 | ||
200 | void extent_io_exit(void) | |
201 | { | |
6d49ba1b | 202 | btrfs_leak_debug_check(); |
8c0a8537 KS |
203 | |
204 | /* | |
205 | * Make sure all delayed rcu free are flushed before we | |
206 | * destroy caches. | |
207 | */ | |
208 | rcu_barrier(); | |
5598e900 KM |
209 | kmem_cache_destroy(extent_state_cache); |
210 | kmem_cache_destroy(extent_buffer_cache); | |
9be3395b CM |
211 | if (btrfs_bioset) |
212 | bioset_free(btrfs_bioset); | |
d1310b2e CM |
213 | } |
214 | ||
215 | void extent_io_tree_init(struct extent_io_tree *tree, | |
f993c883 | 216 | struct address_space *mapping) |
d1310b2e | 217 | { |
6bef4d31 | 218 | tree->state = RB_ROOT; |
d1310b2e CM |
219 | tree->ops = NULL; |
220 | tree->dirty_bytes = 0; | |
70dec807 | 221 | spin_lock_init(&tree->lock); |
d1310b2e | 222 | tree->mapping = mapping; |
d1310b2e | 223 | } |
d1310b2e | 224 | |
b2950863 | 225 | static struct extent_state *alloc_extent_state(gfp_t mask) |
d1310b2e CM |
226 | { |
227 | struct extent_state *state; | |
d1310b2e | 228 | |
3ba7ab22 MH |
229 | /* |
230 | * The given mask might be not appropriate for the slab allocator, | |
231 | * drop the unsupported bits | |
232 | */ | |
233 | mask &= ~(__GFP_DMA32|__GFP_HIGHMEM); | |
d1310b2e | 234 | state = kmem_cache_alloc(extent_state_cache, mask); |
2b114d1d | 235 | if (!state) |
d1310b2e CM |
236 | return state; |
237 | state->state = 0; | |
47dc196a | 238 | state->failrec = NULL; |
27a3507d | 239 | RB_CLEAR_NODE(&state->rb_node); |
6d49ba1b | 240 | btrfs_leak_debug_add(&state->leak_list, &states); |
b7ac31b7 | 241 | refcount_set(&state->refs, 1); |
d1310b2e | 242 | init_waitqueue_head(&state->wq); |
143bede5 | 243 | trace_alloc_extent_state(state, mask, _RET_IP_); |
d1310b2e CM |
244 | return state; |
245 | } | |
d1310b2e | 246 | |
4845e44f | 247 | void free_extent_state(struct extent_state *state) |
d1310b2e | 248 | { |
d1310b2e CM |
249 | if (!state) |
250 | return; | |
b7ac31b7 | 251 | if (refcount_dec_and_test(&state->refs)) { |
27a3507d | 252 | WARN_ON(extent_state_in_tree(state)); |
6d49ba1b | 253 | btrfs_leak_debug_del(&state->leak_list); |
143bede5 | 254 | trace_free_extent_state(state, _RET_IP_); |
d1310b2e CM |
255 | kmem_cache_free(extent_state_cache, state); |
256 | } | |
257 | } | |
d1310b2e | 258 | |
f2071b21 FM |
259 | static struct rb_node *tree_insert(struct rb_root *root, |
260 | struct rb_node *search_start, | |
261 | u64 offset, | |
12cfbad9 FDBM |
262 | struct rb_node *node, |
263 | struct rb_node ***p_in, | |
264 | struct rb_node **parent_in) | |
d1310b2e | 265 | { |
f2071b21 | 266 | struct rb_node **p; |
d397712b | 267 | struct rb_node *parent = NULL; |
d1310b2e CM |
268 | struct tree_entry *entry; |
269 | ||
12cfbad9 FDBM |
270 | if (p_in && parent_in) { |
271 | p = *p_in; | |
272 | parent = *parent_in; | |
273 | goto do_insert; | |
274 | } | |
275 | ||
f2071b21 | 276 | p = search_start ? &search_start : &root->rb_node; |
d397712b | 277 | while (*p) { |
d1310b2e CM |
278 | parent = *p; |
279 | entry = rb_entry(parent, struct tree_entry, rb_node); | |
280 | ||
281 | if (offset < entry->start) | |
282 | p = &(*p)->rb_left; | |
283 | else if (offset > entry->end) | |
284 | p = &(*p)->rb_right; | |
285 | else | |
286 | return parent; | |
287 | } | |
288 | ||
12cfbad9 | 289 | do_insert: |
d1310b2e CM |
290 | rb_link_node(node, parent, p); |
291 | rb_insert_color(node, root); | |
292 | return NULL; | |
293 | } | |
294 | ||
80ea96b1 | 295 | static struct rb_node *__etree_search(struct extent_io_tree *tree, u64 offset, |
12cfbad9 FDBM |
296 | struct rb_node **prev_ret, |
297 | struct rb_node **next_ret, | |
298 | struct rb_node ***p_ret, | |
299 | struct rb_node **parent_ret) | |
d1310b2e | 300 | { |
80ea96b1 | 301 | struct rb_root *root = &tree->state; |
12cfbad9 | 302 | struct rb_node **n = &root->rb_node; |
d1310b2e CM |
303 | struct rb_node *prev = NULL; |
304 | struct rb_node *orig_prev = NULL; | |
305 | struct tree_entry *entry; | |
306 | struct tree_entry *prev_entry = NULL; | |
307 | ||
12cfbad9 FDBM |
308 | while (*n) { |
309 | prev = *n; | |
310 | entry = rb_entry(prev, struct tree_entry, rb_node); | |
d1310b2e CM |
311 | prev_entry = entry; |
312 | ||
313 | if (offset < entry->start) | |
12cfbad9 | 314 | n = &(*n)->rb_left; |
d1310b2e | 315 | else if (offset > entry->end) |
12cfbad9 | 316 | n = &(*n)->rb_right; |
d397712b | 317 | else |
12cfbad9 | 318 | return *n; |
d1310b2e CM |
319 | } |
320 | ||
12cfbad9 FDBM |
321 | if (p_ret) |
322 | *p_ret = n; | |
323 | if (parent_ret) | |
324 | *parent_ret = prev; | |
325 | ||
d1310b2e CM |
326 | if (prev_ret) { |
327 | orig_prev = prev; | |
d397712b | 328 | while (prev && offset > prev_entry->end) { |
d1310b2e CM |
329 | prev = rb_next(prev); |
330 | prev_entry = rb_entry(prev, struct tree_entry, rb_node); | |
331 | } | |
332 | *prev_ret = prev; | |
333 | prev = orig_prev; | |
334 | } | |
335 | ||
336 | if (next_ret) { | |
337 | prev_entry = rb_entry(prev, struct tree_entry, rb_node); | |
d397712b | 338 | while (prev && offset < prev_entry->start) { |
d1310b2e CM |
339 | prev = rb_prev(prev); |
340 | prev_entry = rb_entry(prev, struct tree_entry, rb_node); | |
341 | } | |
342 | *next_ret = prev; | |
343 | } | |
344 | return NULL; | |
345 | } | |
346 | ||
12cfbad9 FDBM |
347 | static inline struct rb_node * |
348 | tree_search_for_insert(struct extent_io_tree *tree, | |
349 | u64 offset, | |
350 | struct rb_node ***p_ret, | |
351 | struct rb_node **parent_ret) | |
d1310b2e | 352 | { |
70dec807 | 353 | struct rb_node *prev = NULL; |
d1310b2e | 354 | struct rb_node *ret; |
70dec807 | 355 | |
12cfbad9 | 356 | ret = __etree_search(tree, offset, &prev, NULL, p_ret, parent_ret); |
d397712b | 357 | if (!ret) |
d1310b2e CM |
358 | return prev; |
359 | return ret; | |
360 | } | |
361 | ||
12cfbad9 FDBM |
362 | static inline struct rb_node *tree_search(struct extent_io_tree *tree, |
363 | u64 offset) | |
364 | { | |
365 | return tree_search_for_insert(tree, offset, NULL, NULL); | |
366 | } | |
367 | ||
9ed74f2d JB |
368 | static void merge_cb(struct extent_io_tree *tree, struct extent_state *new, |
369 | struct extent_state *other) | |
370 | { | |
371 | if (tree->ops && tree->ops->merge_extent_hook) | |
372 | tree->ops->merge_extent_hook(tree->mapping->host, new, | |
373 | other); | |
374 | } | |
375 | ||
d1310b2e CM |
376 | /* |
377 | * utility function to look for merge candidates inside a given range. | |
378 | * Any extents with matching state are merged together into a single | |
379 | * extent in the tree. Extents with EXTENT_IO in their state field | |
380 | * are not merged because the end_io handlers need to be able to do | |
381 | * operations on them without sleeping (or doing allocations/splits). | |
382 | * | |
383 | * This should be called with the tree lock held. | |
384 | */ | |
1bf85046 JM |
385 | static void merge_state(struct extent_io_tree *tree, |
386 | struct extent_state *state) | |
d1310b2e CM |
387 | { |
388 | struct extent_state *other; | |
389 | struct rb_node *other_node; | |
390 | ||
5b21f2ed | 391 | if (state->state & (EXTENT_IOBITS | EXTENT_BOUNDARY)) |
1bf85046 | 392 | return; |
d1310b2e CM |
393 | |
394 | other_node = rb_prev(&state->rb_node); | |
395 | if (other_node) { | |
396 | other = rb_entry(other_node, struct extent_state, rb_node); | |
397 | if (other->end == state->start - 1 && | |
398 | other->state == state->state) { | |
9ed74f2d | 399 | merge_cb(tree, state, other); |
d1310b2e | 400 | state->start = other->start; |
d1310b2e | 401 | rb_erase(&other->rb_node, &tree->state); |
27a3507d | 402 | RB_CLEAR_NODE(&other->rb_node); |
d1310b2e CM |
403 | free_extent_state(other); |
404 | } | |
405 | } | |
406 | other_node = rb_next(&state->rb_node); | |
407 | if (other_node) { | |
408 | other = rb_entry(other_node, struct extent_state, rb_node); | |
409 | if (other->start == state->end + 1 && | |
410 | other->state == state->state) { | |
9ed74f2d | 411 | merge_cb(tree, state, other); |
df98b6e2 | 412 | state->end = other->end; |
df98b6e2 | 413 | rb_erase(&other->rb_node, &tree->state); |
27a3507d | 414 | RB_CLEAR_NODE(&other->rb_node); |
df98b6e2 | 415 | free_extent_state(other); |
d1310b2e CM |
416 | } |
417 | } | |
d1310b2e CM |
418 | } |
419 | ||
1bf85046 | 420 | static void set_state_cb(struct extent_io_tree *tree, |
9ee49a04 | 421 | struct extent_state *state, unsigned *bits) |
291d673e | 422 | { |
1bf85046 JM |
423 | if (tree->ops && tree->ops->set_bit_hook) |
424 | tree->ops->set_bit_hook(tree->mapping->host, state, bits); | |
291d673e CM |
425 | } |
426 | ||
427 | static void clear_state_cb(struct extent_io_tree *tree, | |
9ee49a04 | 428 | struct extent_state *state, unsigned *bits) |
291d673e | 429 | { |
9ed74f2d | 430 | if (tree->ops && tree->ops->clear_bit_hook) |
6fc0ef68 NB |
431 | tree->ops->clear_bit_hook(BTRFS_I(tree->mapping->host), |
432 | state, bits); | |
291d673e CM |
433 | } |
434 | ||
3150b699 | 435 | static void set_state_bits(struct extent_io_tree *tree, |
d38ed27f QW |
436 | struct extent_state *state, unsigned *bits, |
437 | struct extent_changeset *changeset); | |
3150b699 | 438 | |
d1310b2e CM |
439 | /* |
440 | * insert an extent_state struct into the tree. 'bits' are set on the | |
441 | * struct before it is inserted. | |
442 | * | |
443 | * This may return -EEXIST if the extent is already there, in which case the | |
444 | * state struct is freed. | |
445 | * | |
446 | * The tree lock is not taken internally. This is a utility function and | |
447 | * probably isn't what you want to call (see set/clear_extent_bit). | |
448 | */ | |
449 | static int insert_state(struct extent_io_tree *tree, | |
450 | struct extent_state *state, u64 start, u64 end, | |
12cfbad9 FDBM |
451 | struct rb_node ***p, |
452 | struct rb_node **parent, | |
d38ed27f | 453 | unsigned *bits, struct extent_changeset *changeset) |
d1310b2e CM |
454 | { |
455 | struct rb_node *node; | |
456 | ||
31b1a2bd | 457 | if (end < start) |
efe120a0 | 458 | WARN(1, KERN_ERR "BTRFS: end < start %llu %llu\n", |
c1c9ff7c | 459 | end, start); |
d1310b2e CM |
460 | state->start = start; |
461 | state->end = end; | |
9ed74f2d | 462 | |
d38ed27f | 463 | set_state_bits(tree, state, bits, changeset); |
3150b699 | 464 | |
f2071b21 | 465 | node = tree_insert(&tree->state, NULL, end, &state->rb_node, p, parent); |
d1310b2e CM |
466 | if (node) { |
467 | struct extent_state *found; | |
468 | found = rb_entry(node, struct extent_state, rb_node); | |
62e85577 | 469 | pr_err("BTRFS: found node %llu %llu on insert of %llu %llu\n", |
c1c9ff7c | 470 | found->start, found->end, start, end); |
d1310b2e CM |
471 | return -EEXIST; |
472 | } | |
473 | merge_state(tree, state); | |
474 | return 0; | |
475 | } | |
476 | ||
1bf85046 | 477 | static void split_cb(struct extent_io_tree *tree, struct extent_state *orig, |
9ed74f2d JB |
478 | u64 split) |
479 | { | |
480 | if (tree->ops && tree->ops->split_extent_hook) | |
1bf85046 | 481 | tree->ops->split_extent_hook(tree->mapping->host, orig, split); |
9ed74f2d JB |
482 | } |
483 | ||
d1310b2e CM |
484 | /* |
485 | * split a given extent state struct in two, inserting the preallocated | |
486 | * struct 'prealloc' as the newly created second half. 'split' indicates an | |
487 | * offset inside 'orig' where it should be split. | |
488 | * | |
489 | * Before calling, | |
490 | * the tree has 'orig' at [orig->start, orig->end]. After calling, there | |
491 | * are two extent state structs in the tree: | |
492 | * prealloc: [orig->start, split - 1] | |
493 | * orig: [ split, orig->end ] | |
494 | * | |
495 | * The tree locks are not taken by this function. They need to be held | |
496 | * by the caller. | |
497 | */ | |
498 | static int split_state(struct extent_io_tree *tree, struct extent_state *orig, | |
499 | struct extent_state *prealloc, u64 split) | |
500 | { | |
501 | struct rb_node *node; | |
9ed74f2d JB |
502 | |
503 | split_cb(tree, orig, split); | |
504 | ||
d1310b2e CM |
505 | prealloc->start = orig->start; |
506 | prealloc->end = split - 1; | |
507 | prealloc->state = orig->state; | |
508 | orig->start = split; | |
509 | ||
f2071b21 FM |
510 | node = tree_insert(&tree->state, &orig->rb_node, prealloc->end, |
511 | &prealloc->rb_node, NULL, NULL); | |
d1310b2e | 512 | if (node) { |
d1310b2e CM |
513 | free_extent_state(prealloc); |
514 | return -EEXIST; | |
515 | } | |
516 | return 0; | |
517 | } | |
518 | ||
cdc6a395 LZ |
519 | static struct extent_state *next_state(struct extent_state *state) |
520 | { | |
521 | struct rb_node *next = rb_next(&state->rb_node); | |
522 | if (next) | |
523 | return rb_entry(next, struct extent_state, rb_node); | |
524 | else | |
525 | return NULL; | |
526 | } | |
527 | ||
d1310b2e CM |
528 | /* |
529 | * utility function to clear some bits in an extent state struct. | |
1b303fc0 | 530 | * it will optionally wake up any one waiting on this state (wake == 1). |
d1310b2e CM |
531 | * |
532 | * If no bits are set on the state struct after clearing things, the | |
533 | * struct is freed and removed from the tree | |
534 | */ | |
cdc6a395 LZ |
535 | static struct extent_state *clear_state_bit(struct extent_io_tree *tree, |
536 | struct extent_state *state, | |
fefdc557 QW |
537 | unsigned *bits, int wake, |
538 | struct extent_changeset *changeset) | |
d1310b2e | 539 | { |
cdc6a395 | 540 | struct extent_state *next; |
9ee49a04 | 541 | unsigned bits_to_clear = *bits & ~EXTENT_CTLBITS; |
d1310b2e | 542 | |
0ca1f7ce | 543 | if ((bits_to_clear & EXTENT_DIRTY) && (state->state & EXTENT_DIRTY)) { |
d1310b2e CM |
544 | u64 range = state->end - state->start + 1; |
545 | WARN_ON(range > tree->dirty_bytes); | |
546 | tree->dirty_bytes -= range; | |
547 | } | |
291d673e | 548 | clear_state_cb(tree, state, bits); |
fefdc557 | 549 | add_extent_changeset(state, bits_to_clear, changeset, 0); |
32c00aff | 550 | state->state &= ~bits_to_clear; |
d1310b2e CM |
551 | if (wake) |
552 | wake_up(&state->wq); | |
0ca1f7ce | 553 | if (state->state == 0) { |
cdc6a395 | 554 | next = next_state(state); |
27a3507d | 555 | if (extent_state_in_tree(state)) { |
d1310b2e | 556 | rb_erase(&state->rb_node, &tree->state); |
27a3507d | 557 | RB_CLEAR_NODE(&state->rb_node); |
d1310b2e CM |
558 | free_extent_state(state); |
559 | } else { | |
560 | WARN_ON(1); | |
561 | } | |
562 | } else { | |
563 | merge_state(tree, state); | |
cdc6a395 | 564 | next = next_state(state); |
d1310b2e | 565 | } |
cdc6a395 | 566 | return next; |
d1310b2e CM |
567 | } |
568 | ||
8233767a XG |
569 | static struct extent_state * |
570 | alloc_extent_state_atomic(struct extent_state *prealloc) | |
571 | { | |
572 | if (!prealloc) | |
573 | prealloc = alloc_extent_state(GFP_ATOMIC); | |
574 | ||
575 | return prealloc; | |
576 | } | |
577 | ||
48a3b636 | 578 | static void extent_io_tree_panic(struct extent_io_tree *tree, int err) |
c2d904e0 | 579 | { |
5d163e0e JM |
580 | btrfs_panic(tree_fs_info(tree), err, |
581 | "Locking error: Extent tree was modified by another thread while locked."); | |
c2d904e0 JM |
582 | } |
583 | ||
d1310b2e CM |
584 | /* |
585 | * clear some bits on a range in the tree. This may require splitting | |
586 | * or inserting elements in the tree, so the gfp mask is used to | |
587 | * indicate which allocations or sleeping are allowed. | |
588 | * | |
589 | * pass 'wake' == 1 to kick any sleepers, and 'delete' == 1 to remove | |
590 | * the given range from the tree regardless of state (ie for truncate). | |
591 | * | |
592 | * the range [start, end] is inclusive. | |
593 | * | |
6763af84 | 594 | * This takes the tree lock, and returns 0 on success and < 0 on error. |
d1310b2e | 595 | */ |
fefdc557 QW |
596 | static int __clear_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, |
597 | unsigned bits, int wake, int delete, | |
598 | struct extent_state **cached_state, | |
599 | gfp_t mask, struct extent_changeset *changeset) | |
d1310b2e CM |
600 | { |
601 | struct extent_state *state; | |
2c64c53d | 602 | struct extent_state *cached; |
d1310b2e CM |
603 | struct extent_state *prealloc = NULL; |
604 | struct rb_node *node; | |
5c939df5 | 605 | u64 last_end; |
d1310b2e | 606 | int err; |
2ac55d41 | 607 | int clear = 0; |
d1310b2e | 608 | |
a5dee37d | 609 | btrfs_debug_check_extent_io_range(tree, start, end); |
8d599ae1 | 610 | |
7ee9e440 JB |
611 | if (bits & EXTENT_DELALLOC) |
612 | bits |= EXTENT_NORESERVE; | |
613 | ||
0ca1f7ce YZ |
614 | if (delete) |
615 | bits |= ~EXTENT_CTLBITS; | |
616 | bits |= EXTENT_FIRST_DELALLOC; | |
617 | ||
2ac55d41 JB |
618 | if (bits & (EXTENT_IOBITS | EXTENT_BOUNDARY)) |
619 | clear = 1; | |
d1310b2e | 620 | again: |
d0164adc | 621 | if (!prealloc && gfpflags_allow_blocking(mask)) { |
c7bc6319 FM |
622 | /* |
623 | * Don't care for allocation failure here because we might end | |
624 | * up not needing the pre-allocated extent state at all, which | |
625 | * is the case if we only have in the tree extent states that | |
626 | * cover our input range and don't cover too any other range. | |
627 | * If we end up needing a new extent state we allocate it later. | |
628 | */ | |
d1310b2e | 629 | prealloc = alloc_extent_state(mask); |
d1310b2e CM |
630 | } |
631 | ||
cad321ad | 632 | spin_lock(&tree->lock); |
2c64c53d CM |
633 | if (cached_state) { |
634 | cached = *cached_state; | |
2ac55d41 JB |
635 | |
636 | if (clear) { | |
637 | *cached_state = NULL; | |
638 | cached_state = NULL; | |
639 | } | |
640 | ||
27a3507d FM |
641 | if (cached && extent_state_in_tree(cached) && |
642 | cached->start <= start && cached->end > start) { | |
2ac55d41 | 643 | if (clear) |
b7ac31b7 | 644 | refcount_dec(&cached->refs); |
2c64c53d | 645 | state = cached; |
42daec29 | 646 | goto hit_next; |
2c64c53d | 647 | } |
2ac55d41 JB |
648 | if (clear) |
649 | free_extent_state(cached); | |
2c64c53d | 650 | } |
d1310b2e CM |
651 | /* |
652 | * this search will find the extents that end after | |
653 | * our range starts | |
654 | */ | |
80ea96b1 | 655 | node = tree_search(tree, start); |
d1310b2e CM |
656 | if (!node) |
657 | goto out; | |
658 | state = rb_entry(node, struct extent_state, rb_node); | |
2c64c53d | 659 | hit_next: |
d1310b2e CM |
660 | if (state->start > end) |
661 | goto out; | |
662 | WARN_ON(state->end < start); | |
5c939df5 | 663 | last_end = state->end; |
d1310b2e | 664 | |
0449314a | 665 | /* the state doesn't have the wanted bits, go ahead */ |
cdc6a395 LZ |
666 | if (!(state->state & bits)) { |
667 | state = next_state(state); | |
0449314a | 668 | goto next; |
cdc6a395 | 669 | } |
0449314a | 670 | |
d1310b2e CM |
671 | /* |
672 | * | ---- desired range ---- | | |
673 | * | state | or | |
674 | * | ------------- state -------------- | | |
675 | * | |
676 | * We need to split the extent we found, and may flip | |
677 | * bits on second half. | |
678 | * | |
679 | * If the extent we found extends past our range, we | |
680 | * just split and search again. It'll get split again | |
681 | * the next time though. | |
682 | * | |
683 | * If the extent we found is inside our range, we clear | |
684 | * the desired bit on it. | |
685 | */ | |
686 | ||
687 | if (state->start < start) { | |
8233767a XG |
688 | prealloc = alloc_extent_state_atomic(prealloc); |
689 | BUG_ON(!prealloc); | |
d1310b2e | 690 | err = split_state(tree, state, prealloc, start); |
c2d904e0 JM |
691 | if (err) |
692 | extent_io_tree_panic(tree, err); | |
693 | ||
d1310b2e CM |
694 | prealloc = NULL; |
695 | if (err) | |
696 | goto out; | |
697 | if (state->end <= end) { | |
fefdc557 QW |
698 | state = clear_state_bit(tree, state, &bits, wake, |
699 | changeset); | |
d1ac6e41 | 700 | goto next; |
d1310b2e CM |
701 | } |
702 | goto search_again; | |
703 | } | |
704 | /* | |
705 | * | ---- desired range ---- | | |
706 | * | state | | |
707 | * We need to split the extent, and clear the bit | |
708 | * on the first half | |
709 | */ | |
710 | if (state->start <= end && state->end > end) { | |
8233767a XG |
711 | prealloc = alloc_extent_state_atomic(prealloc); |
712 | BUG_ON(!prealloc); | |
d1310b2e | 713 | err = split_state(tree, state, prealloc, end + 1); |
c2d904e0 JM |
714 | if (err) |
715 | extent_io_tree_panic(tree, err); | |
716 | ||
d1310b2e CM |
717 | if (wake) |
718 | wake_up(&state->wq); | |
42daec29 | 719 | |
fefdc557 | 720 | clear_state_bit(tree, prealloc, &bits, wake, changeset); |
9ed74f2d | 721 | |
d1310b2e CM |
722 | prealloc = NULL; |
723 | goto out; | |
724 | } | |
42daec29 | 725 | |
fefdc557 | 726 | state = clear_state_bit(tree, state, &bits, wake, changeset); |
0449314a | 727 | next: |
5c939df5 YZ |
728 | if (last_end == (u64)-1) |
729 | goto out; | |
730 | start = last_end + 1; | |
cdc6a395 | 731 | if (start <= end && state && !need_resched()) |
692e5759 | 732 | goto hit_next; |
d1310b2e CM |
733 | |
734 | search_again: | |
735 | if (start > end) | |
736 | goto out; | |
cad321ad | 737 | spin_unlock(&tree->lock); |
d0164adc | 738 | if (gfpflags_allow_blocking(mask)) |
d1310b2e CM |
739 | cond_resched(); |
740 | goto again; | |
7ab5cb2a DS |
741 | |
742 | out: | |
743 | spin_unlock(&tree->lock); | |
744 | if (prealloc) | |
745 | free_extent_state(prealloc); | |
746 | ||
747 | return 0; | |
748 | ||
d1310b2e | 749 | } |
d1310b2e | 750 | |
143bede5 JM |
751 | static void wait_on_state(struct extent_io_tree *tree, |
752 | struct extent_state *state) | |
641f5219 CH |
753 | __releases(tree->lock) |
754 | __acquires(tree->lock) | |
d1310b2e CM |
755 | { |
756 | DEFINE_WAIT(wait); | |
757 | prepare_to_wait(&state->wq, &wait, TASK_UNINTERRUPTIBLE); | |
cad321ad | 758 | spin_unlock(&tree->lock); |
d1310b2e | 759 | schedule(); |
cad321ad | 760 | spin_lock(&tree->lock); |
d1310b2e | 761 | finish_wait(&state->wq, &wait); |
d1310b2e CM |
762 | } |
763 | ||
764 | /* | |
765 | * waits for one or more bits to clear on a range in the state tree. | |
766 | * The range [start, end] is inclusive. | |
767 | * The tree lock is taken by this function | |
768 | */ | |
41074888 DS |
769 | static void wait_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, |
770 | unsigned long bits) | |
d1310b2e CM |
771 | { |
772 | struct extent_state *state; | |
773 | struct rb_node *node; | |
774 | ||
a5dee37d | 775 | btrfs_debug_check_extent_io_range(tree, start, end); |
8d599ae1 | 776 | |
cad321ad | 777 | spin_lock(&tree->lock); |
d1310b2e CM |
778 | again: |
779 | while (1) { | |
780 | /* | |
781 | * this search will find all the extents that end after | |
782 | * our range starts | |
783 | */ | |
80ea96b1 | 784 | node = tree_search(tree, start); |
c50d3e71 | 785 | process_node: |
d1310b2e CM |
786 | if (!node) |
787 | break; | |
788 | ||
789 | state = rb_entry(node, struct extent_state, rb_node); | |
790 | ||
791 | if (state->start > end) | |
792 | goto out; | |
793 | ||
794 | if (state->state & bits) { | |
795 | start = state->start; | |
b7ac31b7 | 796 | refcount_inc(&state->refs); |
d1310b2e CM |
797 | wait_on_state(tree, state); |
798 | free_extent_state(state); | |
799 | goto again; | |
800 | } | |
801 | start = state->end + 1; | |
802 | ||
803 | if (start > end) | |
804 | break; | |
805 | ||
c50d3e71 FM |
806 | if (!cond_resched_lock(&tree->lock)) { |
807 | node = rb_next(node); | |
808 | goto process_node; | |
809 | } | |
d1310b2e CM |
810 | } |
811 | out: | |
cad321ad | 812 | spin_unlock(&tree->lock); |
d1310b2e | 813 | } |
d1310b2e | 814 | |
1bf85046 | 815 | static void set_state_bits(struct extent_io_tree *tree, |
d1310b2e | 816 | struct extent_state *state, |
d38ed27f | 817 | unsigned *bits, struct extent_changeset *changeset) |
d1310b2e | 818 | { |
9ee49a04 | 819 | unsigned bits_to_set = *bits & ~EXTENT_CTLBITS; |
9ed74f2d | 820 | |
1bf85046 | 821 | set_state_cb(tree, state, bits); |
0ca1f7ce | 822 | if ((bits_to_set & EXTENT_DIRTY) && !(state->state & EXTENT_DIRTY)) { |
d1310b2e CM |
823 | u64 range = state->end - state->start + 1; |
824 | tree->dirty_bytes += range; | |
825 | } | |
d38ed27f | 826 | add_extent_changeset(state, bits_to_set, changeset, 1); |
0ca1f7ce | 827 | state->state |= bits_to_set; |
d1310b2e CM |
828 | } |
829 | ||
e38e2ed7 FM |
830 | static void cache_state_if_flags(struct extent_state *state, |
831 | struct extent_state **cached_ptr, | |
9ee49a04 | 832 | unsigned flags) |
2c64c53d CM |
833 | { |
834 | if (cached_ptr && !(*cached_ptr)) { | |
e38e2ed7 | 835 | if (!flags || (state->state & flags)) { |
2c64c53d | 836 | *cached_ptr = state; |
b7ac31b7 | 837 | refcount_inc(&state->refs); |
2c64c53d CM |
838 | } |
839 | } | |
840 | } | |
841 | ||
e38e2ed7 FM |
842 | static void cache_state(struct extent_state *state, |
843 | struct extent_state **cached_ptr) | |
844 | { | |
845 | return cache_state_if_flags(state, cached_ptr, | |
846 | EXTENT_IOBITS | EXTENT_BOUNDARY); | |
847 | } | |
848 | ||
d1310b2e | 849 | /* |
1edbb734 CM |
850 | * set some bits on a range in the tree. This may require allocations or |
851 | * sleeping, so the gfp mask is used to indicate what is allowed. | |
d1310b2e | 852 | * |
1edbb734 CM |
853 | * If any of the exclusive bits are set, this will fail with -EEXIST if some |
854 | * part of the range already has the desired bits set. The start of the | |
855 | * existing range is returned in failed_start in this case. | |
d1310b2e | 856 | * |
1edbb734 | 857 | * [start, end] is inclusive This takes the tree lock. |
d1310b2e | 858 | */ |
1edbb734 | 859 | |
3fbe5c02 JM |
860 | static int __must_check |
861 | __set_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, | |
9ee49a04 | 862 | unsigned bits, unsigned exclusive_bits, |
41074888 | 863 | u64 *failed_start, struct extent_state **cached_state, |
d38ed27f | 864 | gfp_t mask, struct extent_changeset *changeset) |
d1310b2e CM |
865 | { |
866 | struct extent_state *state; | |
867 | struct extent_state *prealloc = NULL; | |
868 | struct rb_node *node; | |
12cfbad9 FDBM |
869 | struct rb_node **p; |
870 | struct rb_node *parent; | |
d1310b2e | 871 | int err = 0; |
d1310b2e CM |
872 | u64 last_start; |
873 | u64 last_end; | |
42daec29 | 874 | |
a5dee37d | 875 | btrfs_debug_check_extent_io_range(tree, start, end); |
8d599ae1 | 876 | |
0ca1f7ce | 877 | bits |= EXTENT_FIRST_DELALLOC; |
d1310b2e | 878 | again: |
d0164adc | 879 | if (!prealloc && gfpflags_allow_blocking(mask)) { |
059f791c DS |
880 | /* |
881 | * Don't care for allocation failure here because we might end | |
882 | * up not needing the pre-allocated extent state at all, which | |
883 | * is the case if we only have in the tree extent states that | |
884 | * cover our input range and don't cover too any other range. | |
885 | * If we end up needing a new extent state we allocate it later. | |
886 | */ | |
d1310b2e | 887 | prealloc = alloc_extent_state(mask); |
d1310b2e CM |
888 | } |
889 | ||
cad321ad | 890 | spin_lock(&tree->lock); |
9655d298 CM |
891 | if (cached_state && *cached_state) { |
892 | state = *cached_state; | |
df98b6e2 | 893 | if (state->start <= start && state->end > start && |
27a3507d | 894 | extent_state_in_tree(state)) { |
9655d298 CM |
895 | node = &state->rb_node; |
896 | goto hit_next; | |
897 | } | |
898 | } | |
d1310b2e CM |
899 | /* |
900 | * this search will find all the extents that end after | |
901 | * our range starts. | |
902 | */ | |
12cfbad9 | 903 | node = tree_search_for_insert(tree, start, &p, &parent); |
d1310b2e | 904 | if (!node) { |
8233767a XG |
905 | prealloc = alloc_extent_state_atomic(prealloc); |
906 | BUG_ON(!prealloc); | |
12cfbad9 | 907 | err = insert_state(tree, prealloc, start, end, |
d38ed27f | 908 | &p, &parent, &bits, changeset); |
c2d904e0 JM |
909 | if (err) |
910 | extent_io_tree_panic(tree, err); | |
911 | ||
c42ac0bc | 912 | cache_state(prealloc, cached_state); |
d1310b2e | 913 | prealloc = NULL; |
d1310b2e CM |
914 | goto out; |
915 | } | |
d1310b2e | 916 | state = rb_entry(node, struct extent_state, rb_node); |
40431d6c | 917 | hit_next: |
d1310b2e CM |
918 | last_start = state->start; |
919 | last_end = state->end; | |
920 | ||
921 | /* | |
922 | * | ---- desired range ---- | | |
923 | * | state | | |
924 | * | |
925 | * Just lock what we found and keep going | |
926 | */ | |
927 | if (state->start == start && state->end <= end) { | |
1edbb734 | 928 | if (state->state & exclusive_bits) { |
d1310b2e CM |
929 | *failed_start = state->start; |
930 | err = -EEXIST; | |
931 | goto out; | |
932 | } | |
42daec29 | 933 | |
d38ed27f | 934 | set_state_bits(tree, state, &bits, changeset); |
2c64c53d | 935 | cache_state(state, cached_state); |
d1310b2e | 936 | merge_state(tree, state); |
5c939df5 YZ |
937 | if (last_end == (u64)-1) |
938 | goto out; | |
939 | start = last_end + 1; | |
d1ac6e41 LB |
940 | state = next_state(state); |
941 | if (start < end && state && state->start == start && | |
942 | !need_resched()) | |
943 | goto hit_next; | |
d1310b2e CM |
944 | goto search_again; |
945 | } | |
946 | ||
947 | /* | |
948 | * | ---- desired range ---- | | |
949 | * | state | | |
950 | * or | |
951 | * | ------------- state -------------- | | |
952 | * | |
953 | * We need to split the extent we found, and may flip bits on | |
954 | * second half. | |
955 | * | |
956 | * If the extent we found extends past our | |
957 | * range, we just split and search again. It'll get split | |
958 | * again the next time though. | |
959 | * | |
960 | * If the extent we found is inside our range, we set the | |
961 | * desired bit on it. | |
962 | */ | |
963 | if (state->start < start) { | |
1edbb734 | 964 | if (state->state & exclusive_bits) { |
d1310b2e CM |
965 | *failed_start = start; |
966 | err = -EEXIST; | |
967 | goto out; | |
968 | } | |
8233767a XG |
969 | |
970 | prealloc = alloc_extent_state_atomic(prealloc); | |
971 | BUG_ON(!prealloc); | |
d1310b2e | 972 | err = split_state(tree, state, prealloc, start); |
c2d904e0 JM |
973 | if (err) |
974 | extent_io_tree_panic(tree, err); | |
975 | ||
d1310b2e CM |
976 | prealloc = NULL; |
977 | if (err) | |
978 | goto out; | |
979 | if (state->end <= end) { | |
d38ed27f | 980 | set_state_bits(tree, state, &bits, changeset); |
2c64c53d | 981 | cache_state(state, cached_state); |
d1310b2e | 982 | merge_state(tree, state); |
5c939df5 YZ |
983 | if (last_end == (u64)-1) |
984 | goto out; | |
985 | start = last_end + 1; | |
d1ac6e41 LB |
986 | state = next_state(state); |
987 | if (start < end && state && state->start == start && | |
988 | !need_resched()) | |
989 | goto hit_next; | |
d1310b2e CM |
990 | } |
991 | goto search_again; | |
992 | } | |
993 | /* | |
994 | * | ---- desired range ---- | | |
995 | * | state | or | state | | |
996 | * | |
997 | * There's a hole, we need to insert something in it and | |
998 | * ignore the extent we found. | |
999 | */ | |
1000 | if (state->start > start) { | |
1001 | u64 this_end; | |
1002 | if (end < last_start) | |
1003 | this_end = end; | |
1004 | else | |
d397712b | 1005 | this_end = last_start - 1; |
8233767a XG |
1006 | |
1007 | prealloc = alloc_extent_state_atomic(prealloc); | |
1008 | BUG_ON(!prealloc); | |
c7f895a2 XG |
1009 | |
1010 | /* | |
1011 | * Avoid to free 'prealloc' if it can be merged with | |
1012 | * the later extent. | |
1013 | */ | |
d1310b2e | 1014 | err = insert_state(tree, prealloc, start, this_end, |
d38ed27f | 1015 | NULL, NULL, &bits, changeset); |
c2d904e0 JM |
1016 | if (err) |
1017 | extent_io_tree_panic(tree, err); | |
1018 | ||
9ed74f2d JB |
1019 | cache_state(prealloc, cached_state); |
1020 | prealloc = NULL; | |
d1310b2e CM |
1021 | start = this_end + 1; |
1022 | goto search_again; | |
1023 | } | |
1024 | /* | |
1025 | * | ---- desired range ---- | | |
1026 | * | state | | |
1027 | * We need to split the extent, and set the bit | |
1028 | * on the first half | |
1029 | */ | |
1030 | if (state->start <= end && state->end > end) { | |
1edbb734 | 1031 | if (state->state & exclusive_bits) { |
d1310b2e CM |
1032 | *failed_start = start; |
1033 | err = -EEXIST; | |
1034 | goto out; | |
1035 | } | |
8233767a XG |
1036 | |
1037 | prealloc = alloc_extent_state_atomic(prealloc); | |
1038 | BUG_ON(!prealloc); | |
d1310b2e | 1039 | err = split_state(tree, state, prealloc, end + 1); |
c2d904e0 JM |
1040 | if (err) |
1041 | extent_io_tree_panic(tree, err); | |
d1310b2e | 1042 | |
d38ed27f | 1043 | set_state_bits(tree, prealloc, &bits, changeset); |
2c64c53d | 1044 | cache_state(prealloc, cached_state); |
d1310b2e CM |
1045 | merge_state(tree, prealloc); |
1046 | prealloc = NULL; | |
1047 | goto out; | |
1048 | } | |
1049 | ||
b5a4ba14 DS |
1050 | search_again: |
1051 | if (start > end) | |
1052 | goto out; | |
1053 | spin_unlock(&tree->lock); | |
1054 | if (gfpflags_allow_blocking(mask)) | |
1055 | cond_resched(); | |
1056 | goto again; | |
d1310b2e CM |
1057 | |
1058 | out: | |
cad321ad | 1059 | spin_unlock(&tree->lock); |
d1310b2e CM |
1060 | if (prealloc) |
1061 | free_extent_state(prealloc); | |
1062 | ||
1063 | return err; | |
1064 | ||
d1310b2e | 1065 | } |
d1310b2e | 1066 | |
41074888 | 1067 | int set_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, |
9ee49a04 | 1068 | unsigned bits, u64 * failed_start, |
41074888 | 1069 | struct extent_state **cached_state, gfp_t mask) |
3fbe5c02 JM |
1070 | { |
1071 | return __set_extent_bit(tree, start, end, bits, 0, failed_start, | |
d38ed27f | 1072 | cached_state, mask, NULL); |
3fbe5c02 JM |
1073 | } |
1074 | ||
1075 | ||
462d6fac | 1076 | /** |
10983f2e LB |
1077 | * convert_extent_bit - convert all bits in a given range from one bit to |
1078 | * another | |
462d6fac JB |
1079 | * @tree: the io tree to search |
1080 | * @start: the start offset in bytes | |
1081 | * @end: the end offset in bytes (inclusive) | |
1082 | * @bits: the bits to set in this range | |
1083 | * @clear_bits: the bits to clear in this range | |
e6138876 | 1084 | * @cached_state: state that we're going to cache |
462d6fac JB |
1085 | * |
1086 | * This will go through and set bits for the given range. If any states exist | |
1087 | * already in this range they are set with the given bit and cleared of the | |
1088 | * clear_bits. This is only meant to be used by things that are mergeable, ie | |
1089 | * converting from say DELALLOC to DIRTY. This is not meant to be used with | |
1090 | * boundary bits like LOCK. | |
210aa277 DS |
1091 | * |
1092 | * All allocations are done with GFP_NOFS. | |
462d6fac JB |
1093 | */ |
1094 | int convert_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, | |
9ee49a04 | 1095 | unsigned bits, unsigned clear_bits, |
210aa277 | 1096 | struct extent_state **cached_state) |
462d6fac JB |
1097 | { |
1098 | struct extent_state *state; | |
1099 | struct extent_state *prealloc = NULL; | |
1100 | struct rb_node *node; | |
12cfbad9 FDBM |
1101 | struct rb_node **p; |
1102 | struct rb_node *parent; | |
462d6fac JB |
1103 | int err = 0; |
1104 | u64 last_start; | |
1105 | u64 last_end; | |
c8fd3de7 | 1106 | bool first_iteration = true; |
462d6fac | 1107 | |
a5dee37d | 1108 | btrfs_debug_check_extent_io_range(tree, start, end); |
8d599ae1 | 1109 | |
462d6fac | 1110 | again: |
210aa277 | 1111 | if (!prealloc) { |
c8fd3de7 FM |
1112 | /* |
1113 | * Best effort, don't worry if extent state allocation fails | |
1114 | * here for the first iteration. We might have a cached state | |
1115 | * that matches exactly the target range, in which case no | |
1116 | * extent state allocations are needed. We'll only know this | |
1117 | * after locking the tree. | |
1118 | */ | |
210aa277 | 1119 | prealloc = alloc_extent_state(GFP_NOFS); |
c8fd3de7 | 1120 | if (!prealloc && !first_iteration) |
462d6fac JB |
1121 | return -ENOMEM; |
1122 | } | |
1123 | ||
1124 | spin_lock(&tree->lock); | |
e6138876 JB |
1125 | if (cached_state && *cached_state) { |
1126 | state = *cached_state; | |
1127 | if (state->start <= start && state->end > start && | |
27a3507d | 1128 | extent_state_in_tree(state)) { |
e6138876 JB |
1129 | node = &state->rb_node; |
1130 | goto hit_next; | |
1131 | } | |
1132 | } | |
1133 | ||
462d6fac JB |
1134 | /* |
1135 | * this search will find all the extents that end after | |
1136 | * our range starts. | |
1137 | */ | |
12cfbad9 | 1138 | node = tree_search_for_insert(tree, start, &p, &parent); |
462d6fac JB |
1139 | if (!node) { |
1140 | prealloc = alloc_extent_state_atomic(prealloc); | |
1cf4ffdb LB |
1141 | if (!prealloc) { |
1142 | err = -ENOMEM; | |
1143 | goto out; | |
1144 | } | |
12cfbad9 | 1145 | err = insert_state(tree, prealloc, start, end, |
d38ed27f | 1146 | &p, &parent, &bits, NULL); |
c2d904e0 JM |
1147 | if (err) |
1148 | extent_io_tree_panic(tree, err); | |
c42ac0bc FDBM |
1149 | cache_state(prealloc, cached_state); |
1150 | prealloc = NULL; | |
462d6fac JB |
1151 | goto out; |
1152 | } | |
1153 | state = rb_entry(node, struct extent_state, rb_node); | |
1154 | hit_next: | |
1155 | last_start = state->start; | |
1156 | last_end = state->end; | |
1157 | ||
1158 | /* | |
1159 | * | ---- desired range ---- | | |
1160 | * | state | | |
1161 | * | |
1162 | * Just lock what we found and keep going | |
1163 | */ | |
1164 | if (state->start == start && state->end <= end) { | |
d38ed27f | 1165 | set_state_bits(tree, state, &bits, NULL); |
e6138876 | 1166 | cache_state(state, cached_state); |
fefdc557 | 1167 | state = clear_state_bit(tree, state, &clear_bits, 0, NULL); |
462d6fac JB |
1168 | if (last_end == (u64)-1) |
1169 | goto out; | |
462d6fac | 1170 | start = last_end + 1; |
d1ac6e41 LB |
1171 | if (start < end && state && state->start == start && |
1172 | !need_resched()) | |
1173 | goto hit_next; | |
462d6fac JB |
1174 | goto search_again; |
1175 | } | |
1176 | ||
1177 | /* | |
1178 | * | ---- desired range ---- | | |
1179 | * | state | | |
1180 | * or | |
1181 | * | ------------- state -------------- | | |
1182 | * | |
1183 | * We need to split the extent we found, and may flip bits on | |
1184 | * second half. | |
1185 | * | |
1186 | * If the extent we found extends past our | |
1187 | * range, we just split and search again. It'll get split | |
1188 | * again the next time though. | |
1189 | * | |
1190 | * If the extent we found is inside our range, we set the | |
1191 | * desired bit on it. | |
1192 | */ | |
1193 | if (state->start < start) { | |
1194 | prealloc = alloc_extent_state_atomic(prealloc); | |
1cf4ffdb LB |
1195 | if (!prealloc) { |
1196 | err = -ENOMEM; | |
1197 | goto out; | |
1198 | } | |
462d6fac | 1199 | err = split_state(tree, state, prealloc, start); |
c2d904e0 JM |
1200 | if (err) |
1201 | extent_io_tree_panic(tree, err); | |
462d6fac JB |
1202 | prealloc = NULL; |
1203 | if (err) | |
1204 | goto out; | |
1205 | if (state->end <= end) { | |
d38ed27f | 1206 | set_state_bits(tree, state, &bits, NULL); |
e6138876 | 1207 | cache_state(state, cached_state); |
fefdc557 QW |
1208 | state = clear_state_bit(tree, state, &clear_bits, 0, |
1209 | NULL); | |
462d6fac JB |
1210 | if (last_end == (u64)-1) |
1211 | goto out; | |
1212 | start = last_end + 1; | |
d1ac6e41 LB |
1213 | if (start < end && state && state->start == start && |
1214 | !need_resched()) | |
1215 | goto hit_next; | |
462d6fac JB |
1216 | } |
1217 | goto search_again; | |
1218 | } | |
1219 | /* | |
1220 | * | ---- desired range ---- | | |
1221 | * | state | or | state | | |
1222 | * | |
1223 | * There's a hole, we need to insert something in it and | |
1224 | * ignore the extent we found. | |
1225 | */ | |
1226 | if (state->start > start) { | |
1227 | u64 this_end; | |
1228 | if (end < last_start) | |
1229 | this_end = end; | |
1230 | else | |
1231 | this_end = last_start - 1; | |
1232 | ||
1233 | prealloc = alloc_extent_state_atomic(prealloc); | |
1cf4ffdb LB |
1234 | if (!prealloc) { |
1235 | err = -ENOMEM; | |
1236 | goto out; | |
1237 | } | |
462d6fac JB |
1238 | |
1239 | /* | |
1240 | * Avoid to free 'prealloc' if it can be merged with | |
1241 | * the later extent. | |
1242 | */ | |
1243 | err = insert_state(tree, prealloc, start, this_end, | |
d38ed27f | 1244 | NULL, NULL, &bits, NULL); |
c2d904e0 JM |
1245 | if (err) |
1246 | extent_io_tree_panic(tree, err); | |
e6138876 | 1247 | cache_state(prealloc, cached_state); |
462d6fac JB |
1248 | prealloc = NULL; |
1249 | start = this_end + 1; | |
1250 | goto search_again; | |
1251 | } | |
1252 | /* | |
1253 | * | ---- desired range ---- | | |
1254 | * | state | | |
1255 | * We need to split the extent, and set the bit | |
1256 | * on the first half | |
1257 | */ | |
1258 | if (state->start <= end && state->end > end) { | |
1259 | prealloc = alloc_extent_state_atomic(prealloc); | |
1cf4ffdb LB |
1260 | if (!prealloc) { |
1261 | err = -ENOMEM; | |
1262 | goto out; | |
1263 | } | |
462d6fac JB |
1264 | |
1265 | err = split_state(tree, state, prealloc, end + 1); | |
c2d904e0 JM |
1266 | if (err) |
1267 | extent_io_tree_panic(tree, err); | |
462d6fac | 1268 | |
d38ed27f | 1269 | set_state_bits(tree, prealloc, &bits, NULL); |
e6138876 | 1270 | cache_state(prealloc, cached_state); |
fefdc557 | 1271 | clear_state_bit(tree, prealloc, &clear_bits, 0, NULL); |
462d6fac JB |
1272 | prealloc = NULL; |
1273 | goto out; | |
1274 | } | |
1275 | ||
462d6fac JB |
1276 | search_again: |
1277 | if (start > end) | |
1278 | goto out; | |
1279 | spin_unlock(&tree->lock); | |
210aa277 | 1280 | cond_resched(); |
c8fd3de7 | 1281 | first_iteration = false; |
462d6fac | 1282 | goto again; |
462d6fac JB |
1283 | |
1284 | out: | |
1285 | spin_unlock(&tree->lock); | |
1286 | if (prealloc) | |
1287 | free_extent_state(prealloc); | |
1288 | ||
1289 | return err; | |
462d6fac JB |
1290 | } |
1291 | ||
d1310b2e | 1292 | /* wrappers around set/clear extent bit */ |
d38ed27f | 1293 | int set_record_extent_bits(struct extent_io_tree *tree, u64 start, u64 end, |
2c53b912 | 1294 | unsigned bits, struct extent_changeset *changeset) |
d38ed27f QW |
1295 | { |
1296 | /* | |
1297 | * We don't support EXTENT_LOCKED yet, as current changeset will | |
1298 | * record any bits changed, so for EXTENT_LOCKED case, it will | |
1299 | * either fail with -EEXIST or changeset will record the whole | |
1300 | * range. | |
1301 | */ | |
1302 | BUG_ON(bits & EXTENT_LOCKED); | |
1303 | ||
2c53b912 | 1304 | return __set_extent_bit(tree, start, end, bits, 0, NULL, NULL, GFP_NOFS, |
d38ed27f QW |
1305 | changeset); |
1306 | } | |
1307 | ||
fefdc557 QW |
1308 | int clear_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, |
1309 | unsigned bits, int wake, int delete, | |
1310 | struct extent_state **cached, gfp_t mask) | |
1311 | { | |
1312 | return __clear_extent_bit(tree, start, end, bits, wake, delete, | |
1313 | cached, mask, NULL); | |
1314 | } | |
1315 | ||
fefdc557 | 1316 | int clear_record_extent_bits(struct extent_io_tree *tree, u64 start, u64 end, |
f734c44a | 1317 | unsigned bits, struct extent_changeset *changeset) |
fefdc557 QW |
1318 | { |
1319 | /* | |
1320 | * Don't support EXTENT_LOCKED case, same reason as | |
1321 | * set_record_extent_bits(). | |
1322 | */ | |
1323 | BUG_ON(bits & EXTENT_LOCKED); | |
1324 | ||
f734c44a | 1325 | return __clear_extent_bit(tree, start, end, bits, 0, 0, NULL, GFP_NOFS, |
fefdc557 QW |
1326 | changeset); |
1327 | } | |
1328 | ||
d352ac68 CM |
1329 | /* |
1330 | * either insert or lock state struct between start and end use mask to tell | |
1331 | * us if waiting is desired. | |
1332 | */ | |
1edbb734 | 1333 | int lock_extent_bits(struct extent_io_tree *tree, u64 start, u64 end, |
ff13db41 | 1334 | struct extent_state **cached_state) |
d1310b2e CM |
1335 | { |
1336 | int err; | |
1337 | u64 failed_start; | |
9ee49a04 | 1338 | |
d1310b2e | 1339 | while (1) { |
ff13db41 | 1340 | err = __set_extent_bit(tree, start, end, EXTENT_LOCKED, |
3fbe5c02 | 1341 | EXTENT_LOCKED, &failed_start, |
d38ed27f | 1342 | cached_state, GFP_NOFS, NULL); |
d0082371 | 1343 | if (err == -EEXIST) { |
d1310b2e CM |
1344 | wait_extent_bit(tree, failed_start, end, EXTENT_LOCKED); |
1345 | start = failed_start; | |
d0082371 | 1346 | } else |
d1310b2e | 1347 | break; |
d1310b2e CM |
1348 | WARN_ON(start > end); |
1349 | } | |
1350 | return err; | |
1351 | } | |
d1310b2e | 1352 | |
d0082371 | 1353 | int try_lock_extent(struct extent_io_tree *tree, u64 start, u64 end) |
25179201 JB |
1354 | { |
1355 | int err; | |
1356 | u64 failed_start; | |
1357 | ||
3fbe5c02 | 1358 | err = __set_extent_bit(tree, start, end, EXTENT_LOCKED, EXTENT_LOCKED, |
d38ed27f | 1359 | &failed_start, NULL, GFP_NOFS, NULL); |
6643558d YZ |
1360 | if (err == -EEXIST) { |
1361 | if (failed_start > start) | |
1362 | clear_extent_bit(tree, start, failed_start - 1, | |
d0082371 | 1363 | EXTENT_LOCKED, 1, 0, NULL, GFP_NOFS); |
25179201 | 1364 | return 0; |
6643558d | 1365 | } |
25179201 JB |
1366 | return 1; |
1367 | } | |
25179201 | 1368 | |
bd1fa4f0 | 1369 | void extent_range_clear_dirty_for_io(struct inode *inode, u64 start, u64 end) |
4adaa611 | 1370 | { |
09cbfeaf KS |
1371 | unsigned long index = start >> PAGE_SHIFT; |
1372 | unsigned long end_index = end >> PAGE_SHIFT; | |
4adaa611 CM |
1373 | struct page *page; |
1374 | ||
1375 | while (index <= end_index) { | |
1376 | page = find_get_page(inode->i_mapping, index); | |
1377 | BUG_ON(!page); /* Pages should be in the extent_io_tree */ | |
1378 | clear_page_dirty_for_io(page); | |
09cbfeaf | 1379 | put_page(page); |
4adaa611 CM |
1380 | index++; |
1381 | } | |
4adaa611 CM |
1382 | } |
1383 | ||
f6311572 | 1384 | void extent_range_redirty_for_io(struct inode *inode, u64 start, u64 end) |
4adaa611 | 1385 | { |
09cbfeaf KS |
1386 | unsigned long index = start >> PAGE_SHIFT; |
1387 | unsigned long end_index = end >> PAGE_SHIFT; | |
4adaa611 CM |
1388 | struct page *page; |
1389 | ||
1390 | while (index <= end_index) { | |
1391 | page = find_get_page(inode->i_mapping, index); | |
1392 | BUG_ON(!page); /* Pages should be in the extent_io_tree */ | |
4adaa611 | 1393 | __set_page_dirty_nobuffers(page); |
8d38633c | 1394 | account_page_redirty(page); |
09cbfeaf | 1395 | put_page(page); |
4adaa611 CM |
1396 | index++; |
1397 | } | |
4adaa611 CM |
1398 | } |
1399 | ||
d1310b2e CM |
1400 | /* |
1401 | * helper function to set both pages and extents in the tree writeback | |
1402 | */ | |
35de6db2 | 1403 | static void set_range_writeback(struct extent_io_tree *tree, u64 start, u64 end) |
d1310b2e | 1404 | { |
09cbfeaf KS |
1405 | unsigned long index = start >> PAGE_SHIFT; |
1406 | unsigned long end_index = end >> PAGE_SHIFT; | |
d1310b2e CM |
1407 | struct page *page; |
1408 | ||
1409 | while (index <= end_index) { | |
1410 | page = find_get_page(tree->mapping, index); | |
79787eaa | 1411 | BUG_ON(!page); /* Pages should be in the extent_io_tree */ |
d1310b2e | 1412 | set_page_writeback(page); |
09cbfeaf | 1413 | put_page(page); |
d1310b2e CM |
1414 | index++; |
1415 | } | |
d1310b2e | 1416 | } |
d1310b2e | 1417 | |
d352ac68 CM |
1418 | /* find the first state struct with 'bits' set after 'start', and |
1419 | * return it. tree->lock must be held. NULL will returned if | |
1420 | * nothing was found after 'start' | |
1421 | */ | |
48a3b636 ES |
1422 | static struct extent_state * |
1423 | find_first_extent_bit_state(struct extent_io_tree *tree, | |
9ee49a04 | 1424 | u64 start, unsigned bits) |
d7fc640e CM |
1425 | { |
1426 | struct rb_node *node; | |
1427 | struct extent_state *state; | |
1428 | ||
1429 | /* | |
1430 | * this search will find all the extents that end after | |
1431 | * our range starts. | |
1432 | */ | |
1433 | node = tree_search(tree, start); | |
d397712b | 1434 | if (!node) |
d7fc640e | 1435 | goto out; |
d7fc640e | 1436 | |
d397712b | 1437 | while (1) { |
d7fc640e | 1438 | state = rb_entry(node, struct extent_state, rb_node); |
d397712b | 1439 | if (state->end >= start && (state->state & bits)) |
d7fc640e | 1440 | return state; |
d397712b | 1441 | |
d7fc640e CM |
1442 | node = rb_next(node); |
1443 | if (!node) | |
1444 | break; | |
1445 | } | |
1446 | out: | |
1447 | return NULL; | |
1448 | } | |
d7fc640e | 1449 | |
69261c4b XG |
1450 | /* |
1451 | * find the first offset in the io tree with 'bits' set. zero is | |
1452 | * returned if we find something, and *start_ret and *end_ret are | |
1453 | * set to reflect the state struct that was found. | |
1454 | * | |
477d7eaf | 1455 | * If nothing was found, 1 is returned. If found something, return 0. |
69261c4b XG |
1456 | */ |
1457 | int find_first_extent_bit(struct extent_io_tree *tree, u64 start, | |
9ee49a04 | 1458 | u64 *start_ret, u64 *end_ret, unsigned bits, |
e6138876 | 1459 | struct extent_state **cached_state) |
69261c4b XG |
1460 | { |
1461 | struct extent_state *state; | |
e6138876 | 1462 | struct rb_node *n; |
69261c4b XG |
1463 | int ret = 1; |
1464 | ||
1465 | spin_lock(&tree->lock); | |
e6138876 JB |
1466 | if (cached_state && *cached_state) { |
1467 | state = *cached_state; | |
27a3507d | 1468 | if (state->end == start - 1 && extent_state_in_tree(state)) { |
e6138876 JB |
1469 | n = rb_next(&state->rb_node); |
1470 | while (n) { | |
1471 | state = rb_entry(n, struct extent_state, | |
1472 | rb_node); | |
1473 | if (state->state & bits) | |
1474 | goto got_it; | |
1475 | n = rb_next(n); | |
1476 | } | |
1477 | free_extent_state(*cached_state); | |
1478 | *cached_state = NULL; | |
1479 | goto out; | |
1480 | } | |
1481 | free_extent_state(*cached_state); | |
1482 | *cached_state = NULL; | |
1483 | } | |
1484 | ||
69261c4b | 1485 | state = find_first_extent_bit_state(tree, start, bits); |
e6138876 | 1486 | got_it: |
69261c4b | 1487 | if (state) { |
e38e2ed7 | 1488 | cache_state_if_flags(state, cached_state, 0); |
69261c4b XG |
1489 | *start_ret = state->start; |
1490 | *end_ret = state->end; | |
1491 | ret = 0; | |
1492 | } | |
e6138876 | 1493 | out: |
69261c4b XG |
1494 | spin_unlock(&tree->lock); |
1495 | return ret; | |
1496 | } | |
1497 | ||
d352ac68 CM |
1498 | /* |
1499 | * find a contiguous range of bytes in the file marked as delalloc, not | |
1500 | * more than 'max_bytes'. start and end are used to return the range, | |
1501 | * | |
1502 | * 1 is returned if we find something, 0 if nothing was in the tree | |
1503 | */ | |
c8b97818 | 1504 | static noinline u64 find_delalloc_range(struct extent_io_tree *tree, |
c2a128d2 JB |
1505 | u64 *start, u64 *end, u64 max_bytes, |
1506 | struct extent_state **cached_state) | |
d1310b2e CM |
1507 | { |
1508 | struct rb_node *node; | |
1509 | struct extent_state *state; | |
1510 | u64 cur_start = *start; | |
1511 | u64 found = 0; | |
1512 | u64 total_bytes = 0; | |
1513 | ||
cad321ad | 1514 | spin_lock(&tree->lock); |
c8b97818 | 1515 | |
d1310b2e CM |
1516 | /* |
1517 | * this search will find all the extents that end after | |
1518 | * our range starts. | |
1519 | */ | |
80ea96b1 | 1520 | node = tree_search(tree, cur_start); |
2b114d1d | 1521 | if (!node) { |
3b951516 CM |
1522 | if (!found) |
1523 | *end = (u64)-1; | |
d1310b2e CM |
1524 | goto out; |
1525 | } | |
1526 | ||
d397712b | 1527 | while (1) { |
d1310b2e | 1528 | state = rb_entry(node, struct extent_state, rb_node); |
5b21f2ed ZY |
1529 | if (found && (state->start != cur_start || |
1530 | (state->state & EXTENT_BOUNDARY))) { | |
d1310b2e CM |
1531 | goto out; |
1532 | } | |
1533 | if (!(state->state & EXTENT_DELALLOC)) { | |
1534 | if (!found) | |
1535 | *end = state->end; | |
1536 | goto out; | |
1537 | } | |
c2a128d2 | 1538 | if (!found) { |
d1310b2e | 1539 | *start = state->start; |
c2a128d2 | 1540 | *cached_state = state; |
b7ac31b7 | 1541 | refcount_inc(&state->refs); |
c2a128d2 | 1542 | } |
d1310b2e CM |
1543 | found++; |
1544 | *end = state->end; | |
1545 | cur_start = state->end + 1; | |
1546 | node = rb_next(node); | |
d1310b2e | 1547 | total_bytes += state->end - state->start + 1; |
7bf811a5 | 1548 | if (total_bytes >= max_bytes) |
573aecaf | 1549 | break; |
573aecaf | 1550 | if (!node) |
d1310b2e CM |
1551 | break; |
1552 | } | |
1553 | out: | |
cad321ad | 1554 | spin_unlock(&tree->lock); |
d1310b2e CM |
1555 | return found; |
1556 | } | |
1557 | ||
da2c7009 LB |
1558 | static int __process_pages_contig(struct address_space *mapping, |
1559 | struct page *locked_page, | |
1560 | pgoff_t start_index, pgoff_t end_index, | |
1561 | unsigned long page_ops, pgoff_t *index_ret); | |
1562 | ||
143bede5 JM |
1563 | static noinline void __unlock_for_delalloc(struct inode *inode, |
1564 | struct page *locked_page, | |
1565 | u64 start, u64 end) | |
c8b97818 | 1566 | { |
09cbfeaf KS |
1567 | unsigned long index = start >> PAGE_SHIFT; |
1568 | unsigned long end_index = end >> PAGE_SHIFT; | |
c8b97818 | 1569 | |
76c0021d | 1570 | ASSERT(locked_page); |
c8b97818 | 1571 | if (index == locked_page->index && end_index == index) |
143bede5 | 1572 | return; |
c8b97818 | 1573 | |
76c0021d LB |
1574 | __process_pages_contig(inode->i_mapping, locked_page, index, end_index, |
1575 | PAGE_UNLOCK, NULL); | |
c8b97818 CM |
1576 | } |
1577 | ||
1578 | static noinline int lock_delalloc_pages(struct inode *inode, | |
1579 | struct page *locked_page, | |
1580 | u64 delalloc_start, | |
1581 | u64 delalloc_end) | |
1582 | { | |
09cbfeaf | 1583 | unsigned long index = delalloc_start >> PAGE_SHIFT; |
76c0021d | 1584 | unsigned long index_ret = index; |
09cbfeaf | 1585 | unsigned long end_index = delalloc_end >> PAGE_SHIFT; |
c8b97818 | 1586 | int ret; |
c8b97818 | 1587 | |
76c0021d | 1588 | ASSERT(locked_page); |
c8b97818 CM |
1589 | if (index == locked_page->index && index == end_index) |
1590 | return 0; | |
1591 | ||
76c0021d LB |
1592 | ret = __process_pages_contig(inode->i_mapping, locked_page, index, |
1593 | end_index, PAGE_LOCK, &index_ret); | |
1594 | if (ret == -EAGAIN) | |
1595 | __unlock_for_delalloc(inode, locked_page, delalloc_start, | |
1596 | (u64)index_ret << PAGE_SHIFT); | |
c8b97818 CM |
1597 | return ret; |
1598 | } | |
1599 | ||
1600 | /* | |
1601 | * find a contiguous range of bytes in the file marked as delalloc, not | |
1602 | * more than 'max_bytes'. start and end are used to return the range, | |
1603 | * | |
1604 | * 1 is returned if we find something, 0 if nothing was in the tree | |
1605 | */ | |
294e30fe JB |
1606 | STATIC u64 find_lock_delalloc_range(struct inode *inode, |
1607 | struct extent_io_tree *tree, | |
1608 | struct page *locked_page, u64 *start, | |
1609 | u64 *end, u64 max_bytes) | |
c8b97818 CM |
1610 | { |
1611 | u64 delalloc_start; | |
1612 | u64 delalloc_end; | |
1613 | u64 found; | |
9655d298 | 1614 | struct extent_state *cached_state = NULL; |
c8b97818 CM |
1615 | int ret; |
1616 | int loops = 0; | |
1617 | ||
1618 | again: | |
1619 | /* step one, find a bunch of delalloc bytes starting at start */ | |
1620 | delalloc_start = *start; | |
1621 | delalloc_end = 0; | |
1622 | found = find_delalloc_range(tree, &delalloc_start, &delalloc_end, | |
c2a128d2 | 1623 | max_bytes, &cached_state); |
70b99e69 | 1624 | if (!found || delalloc_end <= *start) { |
c8b97818 CM |
1625 | *start = delalloc_start; |
1626 | *end = delalloc_end; | |
c2a128d2 | 1627 | free_extent_state(cached_state); |
385fe0be | 1628 | return 0; |
c8b97818 CM |
1629 | } |
1630 | ||
70b99e69 CM |
1631 | /* |
1632 | * start comes from the offset of locked_page. We have to lock | |
1633 | * pages in order, so we can't process delalloc bytes before | |
1634 | * locked_page | |
1635 | */ | |
d397712b | 1636 | if (delalloc_start < *start) |
70b99e69 | 1637 | delalloc_start = *start; |
70b99e69 | 1638 | |
c8b97818 CM |
1639 | /* |
1640 | * make sure to limit the number of pages we try to lock down | |
c8b97818 | 1641 | */ |
7bf811a5 JB |
1642 | if (delalloc_end + 1 - delalloc_start > max_bytes) |
1643 | delalloc_end = delalloc_start + max_bytes - 1; | |
d397712b | 1644 | |
c8b97818 CM |
1645 | /* step two, lock all the pages after the page that has start */ |
1646 | ret = lock_delalloc_pages(inode, locked_page, | |
1647 | delalloc_start, delalloc_end); | |
1648 | if (ret == -EAGAIN) { | |
1649 | /* some of the pages are gone, lets avoid looping by | |
1650 | * shortening the size of the delalloc range we're searching | |
1651 | */ | |
9655d298 | 1652 | free_extent_state(cached_state); |
7d788742 | 1653 | cached_state = NULL; |
c8b97818 | 1654 | if (!loops) { |
09cbfeaf | 1655 | max_bytes = PAGE_SIZE; |
c8b97818 CM |
1656 | loops = 1; |
1657 | goto again; | |
1658 | } else { | |
1659 | found = 0; | |
1660 | goto out_failed; | |
1661 | } | |
1662 | } | |
79787eaa | 1663 | BUG_ON(ret); /* Only valid values are 0 and -EAGAIN */ |
c8b97818 CM |
1664 | |
1665 | /* step three, lock the state bits for the whole range */ | |
ff13db41 | 1666 | lock_extent_bits(tree, delalloc_start, delalloc_end, &cached_state); |
c8b97818 CM |
1667 | |
1668 | /* then test to make sure it is all still delalloc */ | |
1669 | ret = test_range_bit(tree, delalloc_start, delalloc_end, | |
9655d298 | 1670 | EXTENT_DELALLOC, 1, cached_state); |
c8b97818 | 1671 | if (!ret) { |
9655d298 CM |
1672 | unlock_extent_cached(tree, delalloc_start, delalloc_end, |
1673 | &cached_state, GFP_NOFS); | |
c8b97818 CM |
1674 | __unlock_for_delalloc(inode, locked_page, |
1675 | delalloc_start, delalloc_end); | |
1676 | cond_resched(); | |
1677 | goto again; | |
1678 | } | |
9655d298 | 1679 | free_extent_state(cached_state); |
c8b97818 CM |
1680 | *start = delalloc_start; |
1681 | *end = delalloc_end; | |
1682 | out_failed: | |
1683 | return found; | |
1684 | } | |
1685 | ||
da2c7009 LB |
1686 | static int __process_pages_contig(struct address_space *mapping, |
1687 | struct page *locked_page, | |
1688 | pgoff_t start_index, pgoff_t end_index, | |
1689 | unsigned long page_ops, pgoff_t *index_ret) | |
c8b97818 | 1690 | { |
873695b3 | 1691 | unsigned long nr_pages = end_index - start_index + 1; |
da2c7009 | 1692 | unsigned long pages_locked = 0; |
873695b3 | 1693 | pgoff_t index = start_index; |
c8b97818 | 1694 | struct page *pages[16]; |
873695b3 | 1695 | unsigned ret; |
da2c7009 | 1696 | int err = 0; |
c8b97818 | 1697 | int i; |
771ed689 | 1698 | |
da2c7009 LB |
1699 | if (page_ops & PAGE_LOCK) { |
1700 | ASSERT(page_ops == PAGE_LOCK); | |
1701 | ASSERT(index_ret && *index_ret == start_index); | |
1702 | } | |
1703 | ||
704de49d | 1704 | if ((page_ops & PAGE_SET_ERROR) && nr_pages > 0) |
873695b3 | 1705 | mapping_set_error(mapping, -EIO); |
704de49d | 1706 | |
d397712b | 1707 | while (nr_pages > 0) { |
873695b3 | 1708 | ret = find_get_pages_contig(mapping, index, |
5b050f04 CM |
1709 | min_t(unsigned long, |
1710 | nr_pages, ARRAY_SIZE(pages)), pages); | |
da2c7009 LB |
1711 | if (ret == 0) { |
1712 | /* | |
1713 | * Only if we're going to lock these pages, | |
1714 | * can we find nothing at @index. | |
1715 | */ | |
1716 | ASSERT(page_ops & PAGE_LOCK); | |
49d4a334 LB |
1717 | err = -EAGAIN; |
1718 | goto out; | |
da2c7009 | 1719 | } |
8b62b72b | 1720 | |
da2c7009 | 1721 | for (i = 0; i < ret; i++) { |
c2790a2e | 1722 | if (page_ops & PAGE_SET_PRIVATE2) |
8b62b72b CM |
1723 | SetPagePrivate2(pages[i]); |
1724 | ||
c8b97818 | 1725 | if (pages[i] == locked_page) { |
09cbfeaf | 1726 | put_page(pages[i]); |
da2c7009 | 1727 | pages_locked++; |
c8b97818 CM |
1728 | continue; |
1729 | } | |
c2790a2e | 1730 | if (page_ops & PAGE_CLEAR_DIRTY) |
c8b97818 | 1731 | clear_page_dirty_for_io(pages[i]); |
c2790a2e | 1732 | if (page_ops & PAGE_SET_WRITEBACK) |
c8b97818 | 1733 | set_page_writeback(pages[i]); |
704de49d FM |
1734 | if (page_ops & PAGE_SET_ERROR) |
1735 | SetPageError(pages[i]); | |
c2790a2e | 1736 | if (page_ops & PAGE_END_WRITEBACK) |
c8b97818 | 1737 | end_page_writeback(pages[i]); |
c2790a2e | 1738 | if (page_ops & PAGE_UNLOCK) |
771ed689 | 1739 | unlock_page(pages[i]); |
da2c7009 LB |
1740 | if (page_ops & PAGE_LOCK) { |
1741 | lock_page(pages[i]); | |
1742 | if (!PageDirty(pages[i]) || | |
1743 | pages[i]->mapping != mapping) { | |
1744 | unlock_page(pages[i]); | |
1745 | put_page(pages[i]); | |
1746 | err = -EAGAIN; | |
1747 | goto out; | |
1748 | } | |
1749 | } | |
09cbfeaf | 1750 | put_page(pages[i]); |
da2c7009 | 1751 | pages_locked++; |
c8b97818 CM |
1752 | } |
1753 | nr_pages -= ret; | |
1754 | index += ret; | |
1755 | cond_resched(); | |
1756 | } | |
da2c7009 LB |
1757 | out: |
1758 | if (err && index_ret) | |
1759 | *index_ret = start_index + pages_locked - 1; | |
1760 | return err; | |
c8b97818 | 1761 | } |
c8b97818 | 1762 | |
873695b3 LB |
1763 | void extent_clear_unlock_delalloc(struct inode *inode, u64 start, u64 end, |
1764 | u64 delalloc_end, struct page *locked_page, | |
1765 | unsigned clear_bits, | |
1766 | unsigned long page_ops) | |
1767 | { | |
1768 | clear_extent_bit(&BTRFS_I(inode)->io_tree, start, end, clear_bits, 1, 0, | |
1769 | NULL, GFP_NOFS); | |
1770 | ||
1771 | __process_pages_contig(inode->i_mapping, locked_page, | |
1772 | start >> PAGE_SHIFT, end >> PAGE_SHIFT, | |
da2c7009 | 1773 | page_ops, NULL); |
873695b3 LB |
1774 | } |
1775 | ||
d352ac68 CM |
1776 | /* |
1777 | * count the number of bytes in the tree that have a given bit(s) | |
1778 | * set. This can be fairly slow, except for EXTENT_DIRTY which is | |
1779 | * cached. The total number found is returned. | |
1780 | */ | |
d1310b2e CM |
1781 | u64 count_range_bits(struct extent_io_tree *tree, |
1782 | u64 *start, u64 search_end, u64 max_bytes, | |
9ee49a04 | 1783 | unsigned bits, int contig) |
d1310b2e CM |
1784 | { |
1785 | struct rb_node *node; | |
1786 | struct extent_state *state; | |
1787 | u64 cur_start = *start; | |
1788 | u64 total_bytes = 0; | |
ec29ed5b | 1789 | u64 last = 0; |
d1310b2e CM |
1790 | int found = 0; |
1791 | ||
fae7f21c | 1792 | if (WARN_ON(search_end <= cur_start)) |
d1310b2e | 1793 | return 0; |
d1310b2e | 1794 | |
cad321ad | 1795 | spin_lock(&tree->lock); |
d1310b2e CM |
1796 | if (cur_start == 0 && bits == EXTENT_DIRTY) { |
1797 | total_bytes = tree->dirty_bytes; | |
1798 | goto out; | |
1799 | } | |
1800 | /* | |
1801 | * this search will find all the extents that end after | |
1802 | * our range starts. | |
1803 | */ | |
80ea96b1 | 1804 | node = tree_search(tree, cur_start); |
d397712b | 1805 | if (!node) |
d1310b2e | 1806 | goto out; |
d1310b2e | 1807 | |
d397712b | 1808 | while (1) { |
d1310b2e CM |
1809 | state = rb_entry(node, struct extent_state, rb_node); |
1810 | if (state->start > search_end) | |
1811 | break; | |
ec29ed5b CM |
1812 | if (contig && found && state->start > last + 1) |
1813 | break; | |
1814 | if (state->end >= cur_start && (state->state & bits) == bits) { | |
d1310b2e CM |
1815 | total_bytes += min(search_end, state->end) + 1 - |
1816 | max(cur_start, state->start); | |
1817 | if (total_bytes >= max_bytes) | |
1818 | break; | |
1819 | if (!found) { | |
af60bed2 | 1820 | *start = max(cur_start, state->start); |
d1310b2e CM |
1821 | found = 1; |
1822 | } | |
ec29ed5b CM |
1823 | last = state->end; |
1824 | } else if (contig && found) { | |
1825 | break; | |
d1310b2e CM |
1826 | } |
1827 | node = rb_next(node); | |
1828 | if (!node) | |
1829 | break; | |
1830 | } | |
1831 | out: | |
cad321ad | 1832 | spin_unlock(&tree->lock); |
d1310b2e CM |
1833 | return total_bytes; |
1834 | } | |
b2950863 | 1835 | |
d352ac68 CM |
1836 | /* |
1837 | * set the private field for a given byte offset in the tree. If there isn't | |
1838 | * an extent_state there already, this does nothing. | |
1839 | */ | |
f827ba9a | 1840 | static noinline int set_state_failrec(struct extent_io_tree *tree, u64 start, |
47dc196a | 1841 | struct io_failure_record *failrec) |
d1310b2e CM |
1842 | { |
1843 | struct rb_node *node; | |
1844 | struct extent_state *state; | |
1845 | int ret = 0; | |
1846 | ||
cad321ad | 1847 | spin_lock(&tree->lock); |
d1310b2e CM |
1848 | /* |
1849 | * this search will find all the extents that end after | |
1850 | * our range starts. | |
1851 | */ | |
80ea96b1 | 1852 | node = tree_search(tree, start); |
2b114d1d | 1853 | if (!node) { |
d1310b2e CM |
1854 | ret = -ENOENT; |
1855 | goto out; | |
1856 | } | |
1857 | state = rb_entry(node, struct extent_state, rb_node); | |
1858 | if (state->start != start) { | |
1859 | ret = -ENOENT; | |
1860 | goto out; | |
1861 | } | |
47dc196a | 1862 | state->failrec = failrec; |
d1310b2e | 1863 | out: |
cad321ad | 1864 | spin_unlock(&tree->lock); |
d1310b2e CM |
1865 | return ret; |
1866 | } | |
1867 | ||
f827ba9a | 1868 | static noinline int get_state_failrec(struct extent_io_tree *tree, u64 start, |
47dc196a | 1869 | struct io_failure_record **failrec) |
d1310b2e CM |
1870 | { |
1871 | struct rb_node *node; | |
1872 | struct extent_state *state; | |
1873 | int ret = 0; | |
1874 | ||
cad321ad | 1875 | spin_lock(&tree->lock); |
d1310b2e CM |
1876 | /* |
1877 | * this search will find all the extents that end after | |
1878 | * our range starts. | |
1879 | */ | |
80ea96b1 | 1880 | node = tree_search(tree, start); |
2b114d1d | 1881 | if (!node) { |
d1310b2e CM |
1882 | ret = -ENOENT; |
1883 | goto out; | |
1884 | } | |
1885 | state = rb_entry(node, struct extent_state, rb_node); | |
1886 | if (state->start != start) { | |
1887 | ret = -ENOENT; | |
1888 | goto out; | |
1889 | } | |
47dc196a | 1890 | *failrec = state->failrec; |
d1310b2e | 1891 | out: |
cad321ad | 1892 | spin_unlock(&tree->lock); |
d1310b2e CM |
1893 | return ret; |
1894 | } | |
1895 | ||
1896 | /* | |
1897 | * searches a range in the state tree for a given mask. | |
70dec807 | 1898 | * If 'filled' == 1, this returns 1 only if every extent in the tree |
d1310b2e CM |
1899 | * has the bits set. Otherwise, 1 is returned if any bit in the |
1900 | * range is found set. | |
1901 | */ | |
1902 | int test_range_bit(struct extent_io_tree *tree, u64 start, u64 end, | |
9ee49a04 | 1903 | unsigned bits, int filled, struct extent_state *cached) |
d1310b2e CM |
1904 | { |
1905 | struct extent_state *state = NULL; | |
1906 | struct rb_node *node; | |
1907 | int bitset = 0; | |
d1310b2e | 1908 | |
cad321ad | 1909 | spin_lock(&tree->lock); |
27a3507d | 1910 | if (cached && extent_state_in_tree(cached) && cached->start <= start && |
df98b6e2 | 1911 | cached->end > start) |
9655d298 CM |
1912 | node = &cached->rb_node; |
1913 | else | |
1914 | node = tree_search(tree, start); | |
d1310b2e CM |
1915 | while (node && start <= end) { |
1916 | state = rb_entry(node, struct extent_state, rb_node); | |
1917 | ||
1918 | if (filled && state->start > start) { | |
1919 | bitset = 0; | |
1920 | break; | |
1921 | } | |
1922 | ||
1923 | if (state->start > end) | |
1924 | break; | |
1925 | ||
1926 | if (state->state & bits) { | |
1927 | bitset = 1; | |
1928 | if (!filled) | |
1929 | break; | |
1930 | } else if (filled) { | |
1931 | bitset = 0; | |
1932 | break; | |
1933 | } | |
46562cec CM |
1934 | |
1935 | if (state->end == (u64)-1) | |
1936 | break; | |
1937 | ||
d1310b2e CM |
1938 | start = state->end + 1; |
1939 | if (start > end) | |
1940 | break; | |
1941 | node = rb_next(node); | |
1942 | if (!node) { | |
1943 | if (filled) | |
1944 | bitset = 0; | |
1945 | break; | |
1946 | } | |
1947 | } | |
cad321ad | 1948 | spin_unlock(&tree->lock); |
d1310b2e CM |
1949 | return bitset; |
1950 | } | |
d1310b2e CM |
1951 | |
1952 | /* | |
1953 | * helper function to set a given page up to date if all the | |
1954 | * extents in the tree for that page are up to date | |
1955 | */ | |
143bede5 | 1956 | static void check_page_uptodate(struct extent_io_tree *tree, struct page *page) |
d1310b2e | 1957 | { |
4eee4fa4 | 1958 | u64 start = page_offset(page); |
09cbfeaf | 1959 | u64 end = start + PAGE_SIZE - 1; |
9655d298 | 1960 | if (test_range_bit(tree, start, end, EXTENT_UPTODATE, 1, NULL)) |
d1310b2e | 1961 | SetPageUptodate(page); |
d1310b2e CM |
1962 | } |
1963 | ||
4ac1f4ac | 1964 | int free_io_failure(struct btrfs_inode *inode, struct io_failure_record *rec) |
4a54c8c1 JS |
1965 | { |
1966 | int ret; | |
1967 | int err = 0; | |
4ac1f4ac | 1968 | struct extent_io_tree *failure_tree = &inode->io_failure_tree; |
4a54c8c1 | 1969 | |
47dc196a | 1970 | set_state_failrec(failure_tree, rec->start, NULL); |
4a54c8c1 JS |
1971 | ret = clear_extent_bits(failure_tree, rec->start, |
1972 | rec->start + rec->len - 1, | |
91166212 | 1973 | EXTENT_LOCKED | EXTENT_DIRTY); |
4a54c8c1 JS |
1974 | if (ret) |
1975 | err = ret; | |
1976 | ||
4ac1f4ac | 1977 | ret = clear_extent_bits(&inode->io_tree, rec->start, |
53b381b3 | 1978 | rec->start + rec->len - 1, |
91166212 | 1979 | EXTENT_DAMAGED); |
53b381b3 DW |
1980 | if (ret && !err) |
1981 | err = ret; | |
4a54c8c1 JS |
1982 | |
1983 | kfree(rec); | |
1984 | return err; | |
1985 | } | |
1986 | ||
4a54c8c1 JS |
1987 | /* |
1988 | * this bypasses the standard btrfs submit functions deliberately, as | |
1989 | * the standard behavior is to write all copies in a raid setup. here we only | |
1990 | * want to write the one bad copy. so we do the mapping for ourselves and issue | |
1991 | * submit_bio directly. | |
3ec706c8 | 1992 | * to avoid any synchronization issues, wait for the data after writing, which |
4a54c8c1 JS |
1993 | * actually prevents the read that triggered the error from finishing. |
1994 | * currently, there can be no more than two copies of every data bit. thus, | |
1995 | * exactly one rewrite is required. | |
1996 | */ | |
9d4f7f8a NB |
1997 | int repair_io_failure(struct btrfs_inode *inode, u64 start, u64 length, |
1998 | u64 logical, struct page *page, | |
1999 | unsigned int pg_offset, int mirror_num) | |
4a54c8c1 | 2000 | { |
9d4f7f8a | 2001 | struct btrfs_fs_info *fs_info = inode->root->fs_info; |
4a54c8c1 JS |
2002 | struct bio *bio; |
2003 | struct btrfs_device *dev; | |
4a54c8c1 JS |
2004 | u64 map_length = 0; |
2005 | u64 sector; | |
2006 | struct btrfs_bio *bbio = NULL; | |
2007 | int ret; | |
2008 | ||
908960c6 | 2009 | ASSERT(!(fs_info->sb->s_flags & MS_RDONLY)); |
4a54c8c1 JS |
2010 | BUG_ON(!mirror_num); |
2011 | ||
9be3395b | 2012 | bio = btrfs_io_bio_alloc(GFP_NOFS, 1); |
4a54c8c1 JS |
2013 | if (!bio) |
2014 | return -EIO; | |
4f024f37 | 2015 | bio->bi_iter.bi_size = 0; |
4a54c8c1 JS |
2016 | map_length = length; |
2017 | ||
b5de8d0d FM |
2018 | /* |
2019 | * Avoid races with device replace and make sure our bbio has devices | |
2020 | * associated to its stripes that don't go away while we are doing the | |
2021 | * read repair operation. | |
2022 | */ | |
2023 | btrfs_bio_counter_inc_blocked(fs_info); | |
c725328c LB |
2024 | if (btrfs_is_parity_mirror(fs_info, logical, length, mirror_num)) { |
2025 | /* | |
2026 | * Note that we don't use BTRFS_MAP_WRITE because it's supposed | |
2027 | * to update all raid stripes, but here we just want to correct | |
2028 | * bad stripe, thus BTRFS_MAP_READ is abused to only get the bad | |
2029 | * stripe's dev and sector. | |
2030 | */ | |
2031 | ret = btrfs_map_block(fs_info, BTRFS_MAP_READ, logical, | |
2032 | &map_length, &bbio, 0); | |
2033 | if (ret) { | |
2034 | btrfs_bio_counter_dec(fs_info); | |
2035 | bio_put(bio); | |
2036 | return -EIO; | |
2037 | } | |
2038 | ASSERT(bbio->mirror_num == 1); | |
2039 | } else { | |
2040 | ret = btrfs_map_block(fs_info, BTRFS_MAP_WRITE, logical, | |
2041 | &map_length, &bbio, mirror_num); | |
2042 | if (ret) { | |
2043 | btrfs_bio_counter_dec(fs_info); | |
2044 | bio_put(bio); | |
2045 | return -EIO; | |
2046 | } | |
2047 | BUG_ON(mirror_num != bbio->mirror_num); | |
4a54c8c1 | 2048 | } |
c725328c LB |
2049 | |
2050 | sector = bbio->stripes[bbio->mirror_num - 1].physical >> 9; | |
4f024f37 | 2051 | bio->bi_iter.bi_sector = sector; |
c725328c | 2052 | dev = bbio->stripes[bbio->mirror_num - 1].dev; |
6e9606d2 | 2053 | btrfs_put_bbio(bbio); |
4a54c8c1 | 2054 | if (!dev || !dev->bdev || !dev->writeable) { |
b5de8d0d | 2055 | btrfs_bio_counter_dec(fs_info); |
4a54c8c1 JS |
2056 | bio_put(bio); |
2057 | return -EIO; | |
2058 | } | |
2059 | bio->bi_bdev = dev->bdev; | |
70fd7614 | 2060 | bio->bi_opf = REQ_OP_WRITE | REQ_SYNC; |
ffdd2018 | 2061 | bio_add_page(bio, page, length, pg_offset); |
4a54c8c1 | 2062 | |
4e49ea4a | 2063 | if (btrfsic_submit_bio_wait(bio)) { |
4a54c8c1 | 2064 | /* try to remap that extent elsewhere? */ |
b5de8d0d | 2065 | btrfs_bio_counter_dec(fs_info); |
4a54c8c1 | 2066 | bio_put(bio); |
442a4f63 | 2067 | btrfs_dev_stat_inc_and_print(dev, BTRFS_DEV_STAT_WRITE_ERRS); |
4a54c8c1 JS |
2068 | return -EIO; |
2069 | } | |
2070 | ||
b14af3b4 DS |
2071 | btrfs_info_rl_in_rcu(fs_info, |
2072 | "read error corrected: ino %llu off %llu (dev %s sector %llu)", | |
9d4f7f8a | 2073 | btrfs_ino(inode), start, |
1203b681 | 2074 | rcu_str_deref(dev->name), sector); |
b5de8d0d | 2075 | btrfs_bio_counter_dec(fs_info); |
4a54c8c1 JS |
2076 | bio_put(bio); |
2077 | return 0; | |
2078 | } | |
2079 | ||
2ff7e61e JM |
2080 | int repair_eb_io_failure(struct btrfs_fs_info *fs_info, |
2081 | struct extent_buffer *eb, int mirror_num) | |
ea466794 | 2082 | { |
ea466794 JB |
2083 | u64 start = eb->start; |
2084 | unsigned long i, num_pages = num_extent_pages(eb->start, eb->len); | |
d95603b2 | 2085 | int ret = 0; |
ea466794 | 2086 | |
0b246afa | 2087 | if (fs_info->sb->s_flags & MS_RDONLY) |
908960c6 ID |
2088 | return -EROFS; |
2089 | ||
ea466794 | 2090 | for (i = 0; i < num_pages; i++) { |
fb85fc9a | 2091 | struct page *p = eb->pages[i]; |
1203b681 | 2092 | |
9d4f7f8a | 2093 | ret = repair_io_failure(BTRFS_I(fs_info->btree_inode), start, |
09cbfeaf | 2094 | PAGE_SIZE, start, p, |
1203b681 | 2095 | start - page_offset(p), mirror_num); |
ea466794 JB |
2096 | if (ret) |
2097 | break; | |
09cbfeaf | 2098 | start += PAGE_SIZE; |
ea466794 JB |
2099 | } |
2100 | ||
2101 | return ret; | |
2102 | } | |
2103 | ||
4a54c8c1 JS |
2104 | /* |
2105 | * each time an IO finishes, we do a fast check in the IO failure tree | |
2106 | * to see if we need to process or clean up an io_failure_record | |
2107 | */ | |
b30cb441 | 2108 | int clean_io_failure(struct btrfs_inode *inode, u64 start, struct page *page, |
8b110e39 | 2109 | unsigned int pg_offset) |
4a54c8c1 JS |
2110 | { |
2111 | u64 private; | |
4a54c8c1 | 2112 | struct io_failure_record *failrec; |
b30cb441 | 2113 | struct btrfs_fs_info *fs_info = inode->root->fs_info; |
4a54c8c1 JS |
2114 | struct extent_state *state; |
2115 | int num_copies; | |
4a54c8c1 | 2116 | int ret; |
4a54c8c1 JS |
2117 | |
2118 | private = 0; | |
b30cb441 | 2119 | ret = count_range_bits(&inode->io_failure_tree, &private, |
4a54c8c1 JS |
2120 | (u64)-1, 1, EXTENT_DIRTY, 0); |
2121 | if (!ret) | |
2122 | return 0; | |
2123 | ||
b30cb441 | 2124 | ret = get_state_failrec(&inode->io_failure_tree, start, |
47dc196a | 2125 | &failrec); |
4a54c8c1 JS |
2126 | if (ret) |
2127 | return 0; | |
2128 | ||
4a54c8c1 JS |
2129 | BUG_ON(!failrec->this_mirror); |
2130 | ||
2131 | if (failrec->in_validation) { | |
2132 | /* there was no real error, just free the record */ | |
ab8d0fc4 JM |
2133 | btrfs_debug(fs_info, |
2134 | "clean_io_failure: freeing dummy error at %llu", | |
2135 | failrec->start); | |
4a54c8c1 JS |
2136 | goto out; |
2137 | } | |
908960c6 ID |
2138 | if (fs_info->sb->s_flags & MS_RDONLY) |
2139 | goto out; | |
4a54c8c1 | 2140 | |
b30cb441 NB |
2141 | spin_lock(&inode->io_tree.lock); |
2142 | state = find_first_extent_bit_state(&inode->io_tree, | |
4a54c8c1 JS |
2143 | failrec->start, |
2144 | EXTENT_LOCKED); | |
b30cb441 | 2145 | spin_unlock(&inode->io_tree.lock); |
4a54c8c1 | 2146 | |
883d0de4 MX |
2147 | if (state && state->start <= failrec->start && |
2148 | state->end >= failrec->start + failrec->len - 1) { | |
3ec706c8 SB |
2149 | num_copies = btrfs_num_copies(fs_info, failrec->logical, |
2150 | failrec->len); | |
4a54c8c1 | 2151 | if (num_copies > 1) { |
b30cb441 | 2152 | repair_io_failure(inode, start, failrec->len, |
454ff3de | 2153 | failrec->logical, page, |
1203b681 | 2154 | pg_offset, failrec->failed_mirror); |
4a54c8c1 JS |
2155 | } |
2156 | } | |
2157 | ||
2158 | out: | |
b30cb441 | 2159 | free_io_failure(inode, failrec); |
4a54c8c1 | 2160 | |
454ff3de | 2161 | return 0; |
4a54c8c1 JS |
2162 | } |
2163 | ||
f612496b MX |
2164 | /* |
2165 | * Can be called when | |
2166 | * - hold extent lock | |
2167 | * - under ordered extent | |
2168 | * - the inode is freeing | |
2169 | */ | |
7ab7956e | 2170 | void btrfs_free_io_failure_record(struct btrfs_inode *inode, u64 start, u64 end) |
f612496b | 2171 | { |
7ab7956e | 2172 | struct extent_io_tree *failure_tree = &inode->io_failure_tree; |
f612496b MX |
2173 | struct io_failure_record *failrec; |
2174 | struct extent_state *state, *next; | |
2175 | ||
2176 | if (RB_EMPTY_ROOT(&failure_tree->state)) | |
2177 | return; | |
2178 | ||
2179 | spin_lock(&failure_tree->lock); | |
2180 | state = find_first_extent_bit_state(failure_tree, start, EXTENT_DIRTY); | |
2181 | while (state) { | |
2182 | if (state->start > end) | |
2183 | break; | |
2184 | ||
2185 | ASSERT(state->end <= end); | |
2186 | ||
2187 | next = next_state(state); | |
2188 | ||
47dc196a | 2189 | failrec = state->failrec; |
f612496b MX |
2190 | free_extent_state(state); |
2191 | kfree(failrec); | |
2192 | ||
2193 | state = next; | |
2194 | } | |
2195 | spin_unlock(&failure_tree->lock); | |
2196 | } | |
2197 | ||
2fe6303e | 2198 | int btrfs_get_io_failure_record(struct inode *inode, u64 start, u64 end, |
47dc196a | 2199 | struct io_failure_record **failrec_ret) |
4a54c8c1 | 2200 | { |
ab8d0fc4 | 2201 | struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); |
2fe6303e | 2202 | struct io_failure_record *failrec; |
4a54c8c1 | 2203 | struct extent_map *em; |
4a54c8c1 JS |
2204 | struct extent_io_tree *failure_tree = &BTRFS_I(inode)->io_failure_tree; |
2205 | struct extent_io_tree *tree = &BTRFS_I(inode)->io_tree; | |
2206 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; | |
4a54c8c1 | 2207 | int ret; |
4a54c8c1 JS |
2208 | u64 logical; |
2209 | ||
47dc196a | 2210 | ret = get_state_failrec(failure_tree, start, &failrec); |
4a54c8c1 JS |
2211 | if (ret) { |
2212 | failrec = kzalloc(sizeof(*failrec), GFP_NOFS); | |
2213 | if (!failrec) | |
2214 | return -ENOMEM; | |
2fe6303e | 2215 | |
4a54c8c1 JS |
2216 | failrec->start = start; |
2217 | failrec->len = end - start + 1; | |
2218 | failrec->this_mirror = 0; | |
2219 | failrec->bio_flags = 0; | |
2220 | failrec->in_validation = 0; | |
2221 | ||
2222 | read_lock(&em_tree->lock); | |
2223 | em = lookup_extent_mapping(em_tree, start, failrec->len); | |
2224 | if (!em) { | |
2225 | read_unlock(&em_tree->lock); | |
2226 | kfree(failrec); | |
2227 | return -EIO; | |
2228 | } | |
2229 | ||
68ba990f | 2230 | if (em->start > start || em->start + em->len <= start) { |
4a54c8c1 JS |
2231 | free_extent_map(em); |
2232 | em = NULL; | |
2233 | } | |
2234 | read_unlock(&em_tree->lock); | |
7a2d6a64 | 2235 | if (!em) { |
4a54c8c1 JS |
2236 | kfree(failrec); |
2237 | return -EIO; | |
2238 | } | |
2fe6303e | 2239 | |
4a54c8c1 JS |
2240 | logical = start - em->start; |
2241 | logical = em->block_start + logical; | |
2242 | if (test_bit(EXTENT_FLAG_COMPRESSED, &em->flags)) { | |
2243 | logical = em->block_start; | |
2244 | failrec->bio_flags = EXTENT_BIO_COMPRESSED; | |
2245 | extent_set_compress_type(&failrec->bio_flags, | |
2246 | em->compress_type); | |
2247 | } | |
2fe6303e | 2248 | |
ab8d0fc4 JM |
2249 | btrfs_debug(fs_info, |
2250 | "Get IO Failure Record: (new) logical=%llu, start=%llu, len=%llu", | |
2251 | logical, start, failrec->len); | |
2fe6303e | 2252 | |
4a54c8c1 JS |
2253 | failrec->logical = logical; |
2254 | free_extent_map(em); | |
2255 | ||
2256 | /* set the bits in the private failure tree */ | |
2257 | ret = set_extent_bits(failure_tree, start, end, | |
ceeb0ae7 | 2258 | EXTENT_LOCKED | EXTENT_DIRTY); |
4a54c8c1 | 2259 | if (ret >= 0) |
47dc196a | 2260 | ret = set_state_failrec(failure_tree, start, failrec); |
4a54c8c1 JS |
2261 | /* set the bits in the inode's tree */ |
2262 | if (ret >= 0) | |
ceeb0ae7 | 2263 | ret = set_extent_bits(tree, start, end, EXTENT_DAMAGED); |
4a54c8c1 JS |
2264 | if (ret < 0) { |
2265 | kfree(failrec); | |
2266 | return ret; | |
2267 | } | |
2268 | } else { | |
ab8d0fc4 JM |
2269 | btrfs_debug(fs_info, |
2270 | "Get IO Failure Record: (found) logical=%llu, start=%llu, len=%llu, validation=%d", | |
2271 | failrec->logical, failrec->start, failrec->len, | |
2272 | failrec->in_validation); | |
4a54c8c1 JS |
2273 | /* |
2274 | * when data can be on disk more than twice, add to failrec here | |
2275 | * (e.g. with a list for failed_mirror) to make | |
2276 | * clean_io_failure() clean all those errors at once. | |
2277 | */ | |
2278 | } | |
2fe6303e MX |
2279 | |
2280 | *failrec_ret = failrec; | |
2281 | ||
2282 | return 0; | |
2283 | } | |
2284 | ||
2285 | int btrfs_check_repairable(struct inode *inode, struct bio *failed_bio, | |
2286 | struct io_failure_record *failrec, int failed_mirror) | |
2287 | { | |
ab8d0fc4 | 2288 | struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); |
2fe6303e MX |
2289 | int num_copies; |
2290 | ||
ab8d0fc4 | 2291 | num_copies = btrfs_num_copies(fs_info, failrec->logical, failrec->len); |
4a54c8c1 JS |
2292 | if (num_copies == 1) { |
2293 | /* | |
2294 | * we only have a single copy of the data, so don't bother with | |
2295 | * all the retry and error correction code that follows. no | |
2296 | * matter what the error is, it is very likely to persist. | |
2297 | */ | |
ab8d0fc4 JM |
2298 | btrfs_debug(fs_info, |
2299 | "Check Repairable: cannot repair, num_copies=%d, next_mirror %d, failed_mirror %d", | |
2300 | num_copies, failrec->this_mirror, failed_mirror); | |
2fe6303e | 2301 | return 0; |
4a54c8c1 JS |
2302 | } |
2303 | ||
4a54c8c1 JS |
2304 | /* |
2305 | * there are two premises: | |
2306 | * a) deliver good data to the caller | |
2307 | * b) correct the bad sectors on disk | |
2308 | */ | |
2309 | if (failed_bio->bi_vcnt > 1) { | |
2310 | /* | |
2311 | * to fulfill b), we need to know the exact failing sectors, as | |
2312 | * we don't want to rewrite any more than the failed ones. thus, | |
2313 | * we need separate read requests for the failed bio | |
2314 | * | |
2315 | * if the following BUG_ON triggers, our validation request got | |
2316 | * merged. we need separate requests for our algorithm to work. | |
2317 | */ | |
2318 | BUG_ON(failrec->in_validation); | |
2319 | failrec->in_validation = 1; | |
2320 | failrec->this_mirror = failed_mirror; | |
4a54c8c1 JS |
2321 | } else { |
2322 | /* | |
2323 | * we're ready to fulfill a) and b) alongside. get a good copy | |
2324 | * of the failed sector and if we succeed, we have setup | |
2325 | * everything for repair_io_failure to do the rest for us. | |
2326 | */ | |
2327 | if (failrec->in_validation) { | |
2328 | BUG_ON(failrec->this_mirror != failed_mirror); | |
2329 | failrec->in_validation = 0; | |
2330 | failrec->this_mirror = 0; | |
2331 | } | |
2332 | failrec->failed_mirror = failed_mirror; | |
2333 | failrec->this_mirror++; | |
2334 | if (failrec->this_mirror == failed_mirror) | |
2335 | failrec->this_mirror++; | |
4a54c8c1 JS |
2336 | } |
2337 | ||
facc8a22 | 2338 | if (failrec->this_mirror > num_copies) { |
ab8d0fc4 JM |
2339 | btrfs_debug(fs_info, |
2340 | "Check Repairable: (fail) num_copies=%d, next_mirror %d, failed_mirror %d", | |
2341 | num_copies, failrec->this_mirror, failed_mirror); | |
2fe6303e | 2342 | return 0; |
4a54c8c1 JS |
2343 | } |
2344 | ||
2fe6303e MX |
2345 | return 1; |
2346 | } | |
2347 | ||
2348 | ||
2349 | struct bio *btrfs_create_repair_bio(struct inode *inode, struct bio *failed_bio, | |
2350 | struct io_failure_record *failrec, | |
2351 | struct page *page, int pg_offset, int icsum, | |
8b110e39 | 2352 | bio_end_io_t *endio_func, void *data) |
2fe6303e | 2353 | { |
0b246afa | 2354 | struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); |
2fe6303e MX |
2355 | struct bio *bio; |
2356 | struct btrfs_io_bio *btrfs_failed_bio; | |
2357 | struct btrfs_io_bio *btrfs_bio; | |
2358 | ||
9be3395b | 2359 | bio = btrfs_io_bio_alloc(GFP_NOFS, 1); |
2fe6303e MX |
2360 | if (!bio) |
2361 | return NULL; | |
2362 | ||
2363 | bio->bi_end_io = endio_func; | |
4f024f37 | 2364 | bio->bi_iter.bi_sector = failrec->logical >> 9; |
0b246afa | 2365 | bio->bi_bdev = fs_info->fs_devices->latest_bdev; |
4f024f37 | 2366 | bio->bi_iter.bi_size = 0; |
8b110e39 | 2367 | bio->bi_private = data; |
4a54c8c1 | 2368 | |
facc8a22 MX |
2369 | btrfs_failed_bio = btrfs_io_bio(failed_bio); |
2370 | if (btrfs_failed_bio->csum) { | |
facc8a22 MX |
2371 | u16 csum_size = btrfs_super_csum_size(fs_info->super_copy); |
2372 | ||
2373 | btrfs_bio = btrfs_io_bio(bio); | |
2374 | btrfs_bio->csum = btrfs_bio->csum_inline; | |
2fe6303e MX |
2375 | icsum *= csum_size; |
2376 | memcpy(btrfs_bio->csum, btrfs_failed_bio->csum + icsum, | |
facc8a22 MX |
2377 | csum_size); |
2378 | } | |
2379 | ||
2fe6303e MX |
2380 | bio_add_page(bio, page, failrec->len, pg_offset); |
2381 | ||
2382 | return bio; | |
2383 | } | |
2384 | ||
2385 | /* | |
2386 | * this is a generic handler for readpage errors (default | |
2387 | * readpage_io_failed_hook). if other copies exist, read those and write back | |
2388 | * good data to the failed position. does not investigate in remapping the | |
2389 | * failed extent elsewhere, hoping the device will be smart enough to do this as | |
2390 | * needed | |
2391 | */ | |
2392 | ||
2393 | static int bio_readpage_error(struct bio *failed_bio, u64 phy_offset, | |
2394 | struct page *page, u64 start, u64 end, | |
2395 | int failed_mirror) | |
2396 | { | |
2397 | struct io_failure_record *failrec; | |
2398 | struct inode *inode = page->mapping->host; | |
2399 | struct extent_io_tree *tree = &BTRFS_I(inode)->io_tree; | |
2400 | struct bio *bio; | |
70fd7614 | 2401 | int read_mode = 0; |
2fe6303e MX |
2402 | int ret; |
2403 | ||
1f7ad75b | 2404 | BUG_ON(bio_op(failed_bio) == REQ_OP_WRITE); |
2fe6303e MX |
2405 | |
2406 | ret = btrfs_get_io_failure_record(inode, start, end, &failrec); | |
2407 | if (ret) | |
2408 | return ret; | |
2409 | ||
2410 | ret = btrfs_check_repairable(inode, failed_bio, failrec, failed_mirror); | |
2411 | if (!ret) { | |
4ac1f4ac | 2412 | free_io_failure(BTRFS_I(inode), failrec); |
2fe6303e MX |
2413 | return -EIO; |
2414 | } | |
2415 | ||
2416 | if (failed_bio->bi_vcnt > 1) | |
70fd7614 | 2417 | read_mode |= REQ_FAILFAST_DEV; |
2fe6303e MX |
2418 | |
2419 | phy_offset >>= inode->i_sb->s_blocksize_bits; | |
2420 | bio = btrfs_create_repair_bio(inode, failed_bio, failrec, page, | |
2421 | start - page_offset(page), | |
8b110e39 MX |
2422 | (int)phy_offset, failed_bio->bi_end_io, |
2423 | NULL); | |
2fe6303e | 2424 | if (!bio) { |
4ac1f4ac | 2425 | free_io_failure(BTRFS_I(inode), failrec); |
2fe6303e MX |
2426 | return -EIO; |
2427 | } | |
1f7ad75b | 2428 | bio_set_op_attrs(bio, REQ_OP_READ, read_mode); |
4a54c8c1 | 2429 | |
ab8d0fc4 JM |
2430 | btrfs_debug(btrfs_sb(inode->i_sb), |
2431 | "Repair Read Error: submitting new read[%#x] to this_mirror=%d, in_validation=%d", | |
2432 | read_mode, failrec->this_mirror, failrec->in_validation); | |
4a54c8c1 | 2433 | |
81a75f67 | 2434 | ret = tree->ops->submit_bio_hook(inode, bio, failrec->this_mirror, |
013bd4c3 | 2435 | failrec->bio_flags, 0); |
6c387ab2 | 2436 | if (ret) { |
4ac1f4ac | 2437 | free_io_failure(BTRFS_I(inode), failrec); |
6c387ab2 MX |
2438 | bio_put(bio); |
2439 | } | |
2440 | ||
013bd4c3 | 2441 | return ret; |
4a54c8c1 JS |
2442 | } |
2443 | ||
d1310b2e CM |
2444 | /* lots and lots of room for performance fixes in the end_bio funcs */ |
2445 | ||
b5227c07 | 2446 | void end_extent_writepage(struct page *page, int err, u64 start, u64 end) |
87826df0 JM |
2447 | { |
2448 | int uptodate = (err == 0); | |
2449 | struct extent_io_tree *tree; | |
3e2426bd | 2450 | int ret = 0; |
87826df0 JM |
2451 | |
2452 | tree = &BTRFS_I(page->mapping->host)->io_tree; | |
2453 | ||
c3988d63 DS |
2454 | if (tree->ops && tree->ops->writepage_end_io_hook) |
2455 | tree->ops->writepage_end_io_hook(page, start, end, NULL, | |
2456 | uptodate); | |
87826df0 | 2457 | |
87826df0 | 2458 | if (!uptodate) { |
87826df0 JM |
2459 | ClearPageUptodate(page); |
2460 | SetPageError(page); | |
5dca6eea LB |
2461 | ret = ret < 0 ? ret : -EIO; |
2462 | mapping_set_error(page->mapping, ret); | |
87826df0 | 2463 | } |
87826df0 JM |
2464 | } |
2465 | ||
d1310b2e CM |
2466 | /* |
2467 | * after a writepage IO is done, we need to: | |
2468 | * clear the uptodate bits on error | |
2469 | * clear the writeback bits in the extent tree for this IO | |
2470 | * end_page_writeback if the page has no more pending IO | |
2471 | * | |
2472 | * Scheduling is not allowed, so the extent state tree is expected | |
2473 | * to have one and only one object corresponding to this IO. | |
2474 | */ | |
4246a0b6 | 2475 | static void end_bio_extent_writepage(struct bio *bio) |
d1310b2e | 2476 | { |
2c30c71b | 2477 | struct bio_vec *bvec; |
d1310b2e CM |
2478 | u64 start; |
2479 | u64 end; | |
2c30c71b | 2480 | int i; |
d1310b2e | 2481 | |
2c30c71b | 2482 | bio_for_each_segment_all(bvec, bio, i) { |
d1310b2e | 2483 | struct page *page = bvec->bv_page; |
0b246afa JM |
2484 | struct inode *inode = page->mapping->host; |
2485 | struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); | |
902b22f3 | 2486 | |
17a5adcc AO |
2487 | /* We always issue full-page reads, but if some block |
2488 | * in a page fails to read, blk_update_request() will | |
2489 | * advance bv_offset and adjust bv_len to compensate. | |
2490 | * Print a warning for nonzero offsets, and an error | |
2491 | * if they don't add up to a full page. */ | |
09cbfeaf KS |
2492 | if (bvec->bv_offset || bvec->bv_len != PAGE_SIZE) { |
2493 | if (bvec->bv_offset + bvec->bv_len != PAGE_SIZE) | |
0b246afa | 2494 | btrfs_err(fs_info, |
efe120a0 FH |
2495 | "partial page write in btrfs with offset %u and length %u", |
2496 | bvec->bv_offset, bvec->bv_len); | |
2497 | else | |
0b246afa | 2498 | btrfs_info(fs_info, |
5d163e0e | 2499 | "incomplete page write in btrfs with offset %u and length %u", |
efe120a0 FH |
2500 | bvec->bv_offset, bvec->bv_len); |
2501 | } | |
d1310b2e | 2502 | |
17a5adcc AO |
2503 | start = page_offset(page); |
2504 | end = start + bvec->bv_offset + bvec->bv_len - 1; | |
d1310b2e | 2505 | |
b5227c07 | 2506 | end_extent_writepage(page, bio->bi_error, start, end); |
17a5adcc | 2507 | end_page_writeback(page); |
2c30c71b | 2508 | } |
2b1f55b0 | 2509 | |
d1310b2e | 2510 | bio_put(bio); |
d1310b2e CM |
2511 | } |
2512 | ||
883d0de4 MX |
2513 | static void |
2514 | endio_readpage_release_extent(struct extent_io_tree *tree, u64 start, u64 len, | |
2515 | int uptodate) | |
2516 | { | |
2517 | struct extent_state *cached = NULL; | |
2518 | u64 end = start + len - 1; | |
2519 | ||
2520 | if (uptodate && tree->track_uptodate) | |
2521 | set_extent_uptodate(tree, start, end, &cached, GFP_ATOMIC); | |
2522 | unlock_extent_cached(tree, start, end, &cached, GFP_ATOMIC); | |
2523 | } | |
2524 | ||
d1310b2e CM |
2525 | /* |
2526 | * after a readpage IO is done, we need to: | |
2527 | * clear the uptodate bits on error | |
2528 | * set the uptodate bits if things worked | |
2529 | * set the page up to date if all extents in the tree are uptodate | |
2530 | * clear the lock bit in the extent tree | |
2531 | * unlock the page if there are no other extents locked for it | |
2532 | * | |
2533 | * Scheduling is not allowed, so the extent state tree is expected | |
2534 | * to have one and only one object corresponding to this IO. | |
2535 | */ | |
4246a0b6 | 2536 | static void end_bio_extent_readpage(struct bio *bio) |
d1310b2e | 2537 | { |
2c30c71b | 2538 | struct bio_vec *bvec; |
4246a0b6 | 2539 | int uptodate = !bio->bi_error; |
facc8a22 | 2540 | struct btrfs_io_bio *io_bio = btrfs_io_bio(bio); |
902b22f3 | 2541 | struct extent_io_tree *tree; |
facc8a22 | 2542 | u64 offset = 0; |
d1310b2e CM |
2543 | u64 start; |
2544 | u64 end; | |
facc8a22 | 2545 | u64 len; |
883d0de4 MX |
2546 | u64 extent_start = 0; |
2547 | u64 extent_len = 0; | |
5cf1ab56 | 2548 | int mirror; |
d1310b2e | 2549 | int ret; |
2c30c71b | 2550 | int i; |
d1310b2e | 2551 | |
2c30c71b | 2552 | bio_for_each_segment_all(bvec, bio, i) { |
d1310b2e | 2553 | struct page *page = bvec->bv_page; |
a71754fc | 2554 | struct inode *inode = page->mapping->host; |
ab8d0fc4 | 2555 | struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); |
507903b8 | 2556 | |
ab8d0fc4 JM |
2557 | btrfs_debug(fs_info, |
2558 | "end_bio_extent_readpage: bi_sector=%llu, err=%d, mirror=%u", | |
2559 | (u64)bio->bi_iter.bi_sector, bio->bi_error, | |
2560 | io_bio->mirror_num); | |
a71754fc | 2561 | tree = &BTRFS_I(inode)->io_tree; |
902b22f3 | 2562 | |
17a5adcc AO |
2563 | /* We always issue full-page reads, but if some block |
2564 | * in a page fails to read, blk_update_request() will | |
2565 | * advance bv_offset and adjust bv_len to compensate. | |
2566 | * Print a warning for nonzero offsets, and an error | |
2567 | * if they don't add up to a full page. */ | |
09cbfeaf KS |
2568 | if (bvec->bv_offset || bvec->bv_len != PAGE_SIZE) { |
2569 | if (bvec->bv_offset + bvec->bv_len != PAGE_SIZE) | |
ab8d0fc4 JM |
2570 | btrfs_err(fs_info, |
2571 | "partial page read in btrfs with offset %u and length %u", | |
efe120a0 FH |
2572 | bvec->bv_offset, bvec->bv_len); |
2573 | else | |
ab8d0fc4 JM |
2574 | btrfs_info(fs_info, |
2575 | "incomplete page read in btrfs with offset %u and length %u", | |
efe120a0 FH |
2576 | bvec->bv_offset, bvec->bv_len); |
2577 | } | |
d1310b2e | 2578 | |
17a5adcc AO |
2579 | start = page_offset(page); |
2580 | end = start + bvec->bv_offset + bvec->bv_len - 1; | |
facc8a22 | 2581 | len = bvec->bv_len; |
d1310b2e | 2582 | |
9be3395b | 2583 | mirror = io_bio->mirror_num; |
20c9801d | 2584 | if (likely(uptodate && tree->ops)) { |
facc8a22 MX |
2585 | ret = tree->ops->readpage_end_io_hook(io_bio, offset, |
2586 | page, start, end, | |
2587 | mirror); | |
5ee0844d | 2588 | if (ret) |
d1310b2e | 2589 | uptodate = 0; |
5ee0844d | 2590 | else |
b30cb441 NB |
2591 | clean_io_failure(BTRFS_I(inode), start, |
2592 | page, 0); | |
d1310b2e | 2593 | } |
ea466794 | 2594 | |
f2a09da9 MX |
2595 | if (likely(uptodate)) |
2596 | goto readpage_ok; | |
2597 | ||
20a7db8a | 2598 | if (tree->ops) { |
5cf1ab56 | 2599 | ret = tree->ops->readpage_io_failed_hook(page, mirror); |
9d0d1c8b LB |
2600 | if (ret == -EAGAIN) { |
2601 | /* | |
2602 | * Data inode's readpage_io_failed_hook() always | |
2603 | * returns -EAGAIN. | |
2604 | * | |
2605 | * The generic bio_readpage_error handles errors | |
2606 | * the following way: If possible, new read | |
2607 | * requests are created and submitted and will | |
2608 | * end up in end_bio_extent_readpage as well (if | |
2609 | * we're lucky, not in the !uptodate case). In | |
2610 | * that case it returns 0 and we just go on with | |
2611 | * the next page in our bio. If it can't handle | |
2612 | * the error it will return -EIO and we remain | |
2613 | * responsible for that page. | |
2614 | */ | |
2615 | ret = bio_readpage_error(bio, offset, page, | |
2616 | start, end, mirror); | |
2617 | if (ret == 0) { | |
2618 | uptodate = !bio->bi_error; | |
2619 | offset += len; | |
2620 | continue; | |
2621 | } | |
2622 | } | |
2623 | ||
f4a8e656 | 2624 | /* |
9d0d1c8b LB |
2625 | * metadata's readpage_io_failed_hook() always returns |
2626 | * -EIO and fixes nothing. -EIO is also returned if | |
2627 | * data inode error could not be fixed. | |
f4a8e656 | 2628 | */ |
9d0d1c8b | 2629 | ASSERT(ret == -EIO); |
7e38326f | 2630 | } |
f2a09da9 | 2631 | readpage_ok: |
883d0de4 | 2632 | if (likely(uptodate)) { |
a71754fc | 2633 | loff_t i_size = i_size_read(inode); |
09cbfeaf | 2634 | pgoff_t end_index = i_size >> PAGE_SHIFT; |
a583c026 | 2635 | unsigned off; |
a71754fc JB |
2636 | |
2637 | /* Zero out the end if this page straddles i_size */ | |
09cbfeaf | 2638 | off = i_size & (PAGE_SIZE-1); |
a583c026 | 2639 | if (page->index == end_index && off) |
09cbfeaf | 2640 | zero_user_segment(page, off, PAGE_SIZE); |
17a5adcc | 2641 | SetPageUptodate(page); |
70dec807 | 2642 | } else { |
17a5adcc AO |
2643 | ClearPageUptodate(page); |
2644 | SetPageError(page); | |
70dec807 | 2645 | } |
17a5adcc | 2646 | unlock_page(page); |
facc8a22 | 2647 | offset += len; |
883d0de4 MX |
2648 | |
2649 | if (unlikely(!uptodate)) { | |
2650 | if (extent_len) { | |
2651 | endio_readpage_release_extent(tree, | |
2652 | extent_start, | |
2653 | extent_len, 1); | |
2654 | extent_start = 0; | |
2655 | extent_len = 0; | |
2656 | } | |
2657 | endio_readpage_release_extent(tree, start, | |
2658 | end - start + 1, 0); | |
2659 | } else if (!extent_len) { | |
2660 | extent_start = start; | |
2661 | extent_len = end + 1 - start; | |
2662 | } else if (extent_start + extent_len == start) { | |
2663 | extent_len += end + 1 - start; | |
2664 | } else { | |
2665 | endio_readpage_release_extent(tree, extent_start, | |
2666 | extent_len, uptodate); | |
2667 | extent_start = start; | |
2668 | extent_len = end + 1 - start; | |
2669 | } | |
2c30c71b | 2670 | } |
d1310b2e | 2671 | |
883d0de4 MX |
2672 | if (extent_len) |
2673 | endio_readpage_release_extent(tree, extent_start, extent_len, | |
2674 | uptodate); | |
facc8a22 | 2675 | if (io_bio->end_io) |
4246a0b6 | 2676 | io_bio->end_io(io_bio, bio->bi_error); |
d1310b2e | 2677 | bio_put(bio); |
d1310b2e CM |
2678 | } |
2679 | ||
9be3395b CM |
2680 | /* |
2681 | * this allocates from the btrfs_bioset. We're returning a bio right now | |
2682 | * but you can call btrfs_io_bio for the appropriate container_of magic | |
2683 | */ | |
88f794ed MX |
2684 | struct bio * |
2685 | btrfs_bio_alloc(struct block_device *bdev, u64 first_sector, int nr_vecs, | |
2686 | gfp_t gfp_flags) | |
d1310b2e | 2687 | { |
facc8a22 | 2688 | struct btrfs_io_bio *btrfs_bio; |
d1310b2e CM |
2689 | struct bio *bio; |
2690 | ||
9be3395b | 2691 | bio = bio_alloc_bioset(gfp_flags, nr_vecs, btrfs_bioset); |
d1310b2e CM |
2692 | |
2693 | if (bio == NULL && (current->flags & PF_MEMALLOC)) { | |
9be3395b CM |
2694 | while (!bio && (nr_vecs /= 2)) { |
2695 | bio = bio_alloc_bioset(gfp_flags, | |
2696 | nr_vecs, btrfs_bioset); | |
2697 | } | |
d1310b2e CM |
2698 | } |
2699 | ||
2700 | if (bio) { | |
2701 | bio->bi_bdev = bdev; | |
4f024f37 | 2702 | bio->bi_iter.bi_sector = first_sector; |
facc8a22 MX |
2703 | btrfs_bio = btrfs_io_bio(bio); |
2704 | btrfs_bio->csum = NULL; | |
2705 | btrfs_bio->csum_allocated = NULL; | |
2706 | btrfs_bio->end_io = NULL; | |
d1310b2e CM |
2707 | } |
2708 | return bio; | |
2709 | } | |
2710 | ||
9be3395b CM |
2711 | struct bio *btrfs_bio_clone(struct bio *bio, gfp_t gfp_mask) |
2712 | { | |
23ea8e5a MX |
2713 | struct btrfs_io_bio *btrfs_bio; |
2714 | struct bio *new; | |
9be3395b | 2715 | |
23ea8e5a MX |
2716 | new = bio_clone_bioset(bio, gfp_mask, btrfs_bioset); |
2717 | if (new) { | |
2718 | btrfs_bio = btrfs_io_bio(new); | |
2719 | btrfs_bio->csum = NULL; | |
2720 | btrfs_bio->csum_allocated = NULL; | |
2721 | btrfs_bio->end_io = NULL; | |
2722 | } | |
2723 | return new; | |
2724 | } | |
9be3395b CM |
2725 | |
2726 | /* this also allocates from the btrfs_bioset */ | |
2727 | struct bio *btrfs_io_bio_alloc(gfp_t gfp_mask, unsigned int nr_iovecs) | |
2728 | { | |
facc8a22 MX |
2729 | struct btrfs_io_bio *btrfs_bio; |
2730 | struct bio *bio; | |
2731 | ||
2732 | bio = bio_alloc_bioset(gfp_mask, nr_iovecs, btrfs_bioset); | |
2733 | if (bio) { | |
2734 | btrfs_bio = btrfs_io_bio(bio); | |
2735 | btrfs_bio->csum = NULL; | |
2736 | btrfs_bio->csum_allocated = NULL; | |
2737 | btrfs_bio->end_io = NULL; | |
2738 | } | |
2739 | return bio; | |
9be3395b CM |
2740 | } |
2741 | ||
2742 | ||
1f7ad75b MC |
2743 | static int __must_check submit_one_bio(struct bio *bio, int mirror_num, |
2744 | unsigned long bio_flags) | |
d1310b2e | 2745 | { |
d1310b2e | 2746 | int ret = 0; |
70dec807 CM |
2747 | struct bio_vec *bvec = bio->bi_io_vec + bio->bi_vcnt - 1; |
2748 | struct page *page = bvec->bv_page; | |
2749 | struct extent_io_tree *tree = bio->bi_private; | |
70dec807 | 2750 | u64 start; |
70dec807 | 2751 | |
4eee4fa4 | 2752 | start = page_offset(page) + bvec->bv_offset; |
70dec807 | 2753 | |
902b22f3 | 2754 | bio->bi_private = NULL; |
d1310b2e CM |
2755 | bio_get(bio); |
2756 | ||
20c9801d | 2757 | if (tree->ops) |
81a75f67 | 2758 | ret = tree->ops->submit_bio_hook(page->mapping->host, bio, |
eaf25d93 | 2759 | mirror_num, bio_flags, start); |
0b86a832 | 2760 | else |
4e49ea4a | 2761 | btrfsic_submit_bio(bio); |
4a54c8c1 | 2762 | |
d1310b2e CM |
2763 | bio_put(bio); |
2764 | return ret; | |
2765 | } | |
2766 | ||
1f7ad75b | 2767 | static int merge_bio(struct extent_io_tree *tree, struct page *page, |
3444a972 JM |
2768 | unsigned long offset, size_t size, struct bio *bio, |
2769 | unsigned long bio_flags) | |
2770 | { | |
2771 | int ret = 0; | |
20c9801d | 2772 | if (tree->ops) |
81a75f67 | 2773 | ret = tree->ops->merge_bio_hook(page, offset, size, bio, |
3444a972 | 2774 | bio_flags); |
3444a972 JM |
2775 | return ret; |
2776 | ||
2777 | } | |
2778 | ||
1f7ad75b | 2779 | static int submit_extent_page(int op, int op_flags, struct extent_io_tree *tree, |
da2f0f74 | 2780 | struct writeback_control *wbc, |
d1310b2e CM |
2781 | struct page *page, sector_t sector, |
2782 | size_t size, unsigned long offset, | |
2783 | struct block_device *bdev, | |
2784 | struct bio **bio_ret, | |
f188591e | 2785 | bio_end_io_t end_io_func, |
c8b97818 CM |
2786 | int mirror_num, |
2787 | unsigned long prev_bio_flags, | |
005efedf FM |
2788 | unsigned long bio_flags, |
2789 | bool force_bio_submit) | |
d1310b2e CM |
2790 | { |
2791 | int ret = 0; | |
2792 | struct bio *bio; | |
c8b97818 | 2793 | int contig = 0; |
c8b97818 | 2794 | int old_compressed = prev_bio_flags & EXTENT_BIO_COMPRESSED; |
09cbfeaf | 2795 | size_t page_size = min_t(size_t, size, PAGE_SIZE); |
d1310b2e CM |
2796 | |
2797 | if (bio_ret && *bio_ret) { | |
2798 | bio = *bio_ret; | |
c8b97818 | 2799 | if (old_compressed) |
4f024f37 | 2800 | contig = bio->bi_iter.bi_sector == sector; |
c8b97818 | 2801 | else |
f73a1c7d | 2802 | contig = bio_end_sector(bio) == sector; |
c8b97818 CM |
2803 | |
2804 | if (prev_bio_flags != bio_flags || !contig || | |
005efedf | 2805 | force_bio_submit || |
1f7ad75b | 2806 | merge_bio(tree, page, offset, page_size, bio, bio_flags) || |
c8b97818 | 2807 | bio_add_page(bio, page, page_size, offset) < page_size) { |
1f7ad75b | 2808 | ret = submit_one_bio(bio, mirror_num, prev_bio_flags); |
289454ad NA |
2809 | if (ret < 0) { |
2810 | *bio_ret = NULL; | |
79787eaa | 2811 | return ret; |
289454ad | 2812 | } |
d1310b2e CM |
2813 | bio = NULL; |
2814 | } else { | |
da2f0f74 CM |
2815 | if (wbc) |
2816 | wbc_account_io(wbc, page, page_size); | |
d1310b2e CM |
2817 | return 0; |
2818 | } | |
2819 | } | |
c8b97818 | 2820 | |
b54ffb73 KO |
2821 | bio = btrfs_bio_alloc(bdev, sector, BIO_MAX_PAGES, |
2822 | GFP_NOFS | __GFP_HIGH); | |
5df67083 TI |
2823 | if (!bio) |
2824 | return -ENOMEM; | |
70dec807 | 2825 | |
c8b97818 | 2826 | bio_add_page(bio, page, page_size, offset); |
d1310b2e CM |
2827 | bio->bi_end_io = end_io_func; |
2828 | bio->bi_private = tree; | |
1f7ad75b | 2829 | bio_set_op_attrs(bio, op, op_flags); |
da2f0f74 CM |
2830 | if (wbc) { |
2831 | wbc_init_bio(wbc, bio); | |
2832 | wbc_account_io(wbc, page, page_size); | |
2833 | } | |
70dec807 | 2834 | |
d397712b | 2835 | if (bio_ret) |
d1310b2e | 2836 | *bio_ret = bio; |
d397712b | 2837 | else |
1f7ad75b | 2838 | ret = submit_one_bio(bio, mirror_num, bio_flags); |
d1310b2e CM |
2839 | |
2840 | return ret; | |
2841 | } | |
2842 | ||
48a3b636 ES |
2843 | static void attach_extent_buffer_page(struct extent_buffer *eb, |
2844 | struct page *page) | |
d1310b2e CM |
2845 | { |
2846 | if (!PagePrivate(page)) { | |
2847 | SetPagePrivate(page); | |
09cbfeaf | 2848 | get_page(page); |
4f2de97a JB |
2849 | set_page_private(page, (unsigned long)eb); |
2850 | } else { | |
2851 | WARN_ON(page->private != (unsigned long)eb); | |
d1310b2e CM |
2852 | } |
2853 | } | |
2854 | ||
4f2de97a | 2855 | void set_page_extent_mapped(struct page *page) |
d1310b2e | 2856 | { |
4f2de97a JB |
2857 | if (!PagePrivate(page)) { |
2858 | SetPagePrivate(page); | |
09cbfeaf | 2859 | get_page(page); |
4f2de97a JB |
2860 | set_page_private(page, EXTENT_PAGE_PRIVATE); |
2861 | } | |
d1310b2e CM |
2862 | } |
2863 | ||
125bac01 MX |
2864 | static struct extent_map * |
2865 | __get_extent_map(struct inode *inode, struct page *page, size_t pg_offset, | |
2866 | u64 start, u64 len, get_extent_t *get_extent, | |
2867 | struct extent_map **em_cached) | |
2868 | { | |
2869 | struct extent_map *em; | |
2870 | ||
2871 | if (em_cached && *em_cached) { | |
2872 | em = *em_cached; | |
cbc0e928 | 2873 | if (extent_map_in_tree(em) && start >= em->start && |
125bac01 | 2874 | start < extent_map_end(em)) { |
490b54d6 | 2875 | refcount_inc(&em->refs); |
125bac01 MX |
2876 | return em; |
2877 | } | |
2878 | ||
2879 | free_extent_map(em); | |
2880 | *em_cached = NULL; | |
2881 | } | |
2882 | ||
fc4f21b1 | 2883 | em = get_extent(BTRFS_I(inode), page, pg_offset, start, len, 0); |
125bac01 MX |
2884 | if (em_cached && !IS_ERR_OR_NULL(em)) { |
2885 | BUG_ON(*em_cached); | |
490b54d6 | 2886 | refcount_inc(&em->refs); |
125bac01 MX |
2887 | *em_cached = em; |
2888 | } | |
2889 | return em; | |
2890 | } | |
d1310b2e CM |
2891 | /* |
2892 | * basic readpage implementation. Locked extent state structs are inserted | |
2893 | * into the tree that are removed when the IO is done (by the end_io | |
2894 | * handlers) | |
79787eaa | 2895 | * XXX JDM: This needs looking at to ensure proper page locking |
baf863b9 | 2896 | * return 0 on success, otherwise return error |
d1310b2e | 2897 | */ |
9974090b MX |
2898 | static int __do_readpage(struct extent_io_tree *tree, |
2899 | struct page *page, | |
2900 | get_extent_t *get_extent, | |
125bac01 | 2901 | struct extent_map **em_cached, |
9974090b | 2902 | struct bio **bio, int mirror_num, |
1f7ad75b | 2903 | unsigned long *bio_flags, int read_flags, |
005efedf | 2904 | u64 *prev_em_start) |
d1310b2e CM |
2905 | { |
2906 | struct inode *inode = page->mapping->host; | |
4eee4fa4 | 2907 | u64 start = page_offset(page); |
09cbfeaf | 2908 | u64 page_end = start + PAGE_SIZE - 1; |
d1310b2e CM |
2909 | u64 end; |
2910 | u64 cur = start; | |
2911 | u64 extent_offset; | |
2912 | u64 last_byte = i_size_read(inode); | |
2913 | u64 block_start; | |
2914 | u64 cur_end; | |
2915 | sector_t sector; | |
2916 | struct extent_map *em; | |
2917 | struct block_device *bdev; | |
baf863b9 | 2918 | int ret = 0; |
d1310b2e | 2919 | int nr = 0; |
306e16ce | 2920 | size_t pg_offset = 0; |
d1310b2e | 2921 | size_t iosize; |
c8b97818 | 2922 | size_t disk_io_size; |
d1310b2e | 2923 | size_t blocksize = inode->i_sb->s_blocksize; |
7f042a83 | 2924 | unsigned long this_bio_flag = 0; |
d1310b2e CM |
2925 | |
2926 | set_page_extent_mapped(page); | |
2927 | ||
9974090b | 2928 | end = page_end; |
90a887c9 DM |
2929 | if (!PageUptodate(page)) { |
2930 | if (cleancache_get_page(page) == 0) { | |
2931 | BUG_ON(blocksize != PAGE_SIZE); | |
9974090b | 2932 | unlock_extent(tree, start, end); |
90a887c9 DM |
2933 | goto out; |
2934 | } | |
2935 | } | |
2936 | ||
09cbfeaf | 2937 | if (page->index == last_byte >> PAGE_SHIFT) { |
c8b97818 | 2938 | char *userpage; |
09cbfeaf | 2939 | size_t zero_offset = last_byte & (PAGE_SIZE - 1); |
c8b97818 CM |
2940 | |
2941 | if (zero_offset) { | |
09cbfeaf | 2942 | iosize = PAGE_SIZE - zero_offset; |
7ac687d9 | 2943 | userpage = kmap_atomic(page); |
c8b97818 CM |
2944 | memset(userpage + zero_offset, 0, iosize); |
2945 | flush_dcache_page(page); | |
7ac687d9 | 2946 | kunmap_atomic(userpage); |
c8b97818 CM |
2947 | } |
2948 | } | |
d1310b2e | 2949 | while (cur <= end) { |
005efedf | 2950 | bool force_bio_submit = false; |
c8f2f24b | 2951 | |
d1310b2e CM |
2952 | if (cur >= last_byte) { |
2953 | char *userpage; | |
507903b8 AJ |
2954 | struct extent_state *cached = NULL; |
2955 | ||
09cbfeaf | 2956 | iosize = PAGE_SIZE - pg_offset; |
7ac687d9 | 2957 | userpage = kmap_atomic(page); |
306e16ce | 2958 | memset(userpage + pg_offset, 0, iosize); |
d1310b2e | 2959 | flush_dcache_page(page); |
7ac687d9 | 2960 | kunmap_atomic(userpage); |
d1310b2e | 2961 | set_extent_uptodate(tree, cur, cur + iosize - 1, |
507903b8 | 2962 | &cached, GFP_NOFS); |
7f042a83 FM |
2963 | unlock_extent_cached(tree, cur, |
2964 | cur + iosize - 1, | |
2965 | &cached, GFP_NOFS); | |
d1310b2e CM |
2966 | break; |
2967 | } | |
125bac01 MX |
2968 | em = __get_extent_map(inode, page, pg_offset, cur, |
2969 | end - cur + 1, get_extent, em_cached); | |
c704005d | 2970 | if (IS_ERR_OR_NULL(em)) { |
d1310b2e | 2971 | SetPageError(page); |
7f042a83 | 2972 | unlock_extent(tree, cur, end); |
d1310b2e CM |
2973 | break; |
2974 | } | |
d1310b2e CM |
2975 | extent_offset = cur - em->start; |
2976 | BUG_ON(extent_map_end(em) <= cur); | |
2977 | BUG_ON(end < cur); | |
2978 | ||
261507a0 | 2979 | if (test_bit(EXTENT_FLAG_COMPRESSED, &em->flags)) { |
4b384318 | 2980 | this_bio_flag |= EXTENT_BIO_COMPRESSED; |
261507a0 LZ |
2981 | extent_set_compress_type(&this_bio_flag, |
2982 | em->compress_type); | |
2983 | } | |
c8b97818 | 2984 | |
d1310b2e CM |
2985 | iosize = min(extent_map_end(em) - cur, end - cur + 1); |
2986 | cur_end = min(extent_map_end(em) - 1, end); | |
fda2832f | 2987 | iosize = ALIGN(iosize, blocksize); |
c8b97818 CM |
2988 | if (this_bio_flag & EXTENT_BIO_COMPRESSED) { |
2989 | disk_io_size = em->block_len; | |
2990 | sector = em->block_start >> 9; | |
2991 | } else { | |
2992 | sector = (em->block_start + extent_offset) >> 9; | |
2993 | disk_io_size = iosize; | |
2994 | } | |
d1310b2e CM |
2995 | bdev = em->bdev; |
2996 | block_start = em->block_start; | |
d899e052 YZ |
2997 | if (test_bit(EXTENT_FLAG_PREALLOC, &em->flags)) |
2998 | block_start = EXTENT_MAP_HOLE; | |
005efedf FM |
2999 | |
3000 | /* | |
3001 | * If we have a file range that points to a compressed extent | |
3002 | * and it's followed by a consecutive file range that points to | |
3003 | * to the same compressed extent (possibly with a different | |
3004 | * offset and/or length, so it either points to the whole extent | |
3005 | * or only part of it), we must make sure we do not submit a | |
3006 | * single bio to populate the pages for the 2 ranges because | |
3007 | * this makes the compressed extent read zero out the pages | |
3008 | * belonging to the 2nd range. Imagine the following scenario: | |
3009 | * | |
3010 | * File layout | |
3011 | * [0 - 8K] [8K - 24K] | |
3012 | * | | | |
3013 | * | | | |
3014 | * points to extent X, points to extent X, | |
3015 | * offset 4K, length of 8K offset 0, length 16K | |
3016 | * | |
3017 | * [extent X, compressed length = 4K uncompressed length = 16K] | |
3018 | * | |
3019 | * If the bio to read the compressed extent covers both ranges, | |
3020 | * it will decompress extent X into the pages belonging to the | |
3021 | * first range and then it will stop, zeroing out the remaining | |
3022 | * pages that belong to the other range that points to extent X. | |
3023 | * So here we make sure we submit 2 bios, one for the first | |
3024 | * range and another one for the third range. Both will target | |
3025 | * the same physical extent from disk, but we can't currently | |
3026 | * make the compressed bio endio callback populate the pages | |
3027 | * for both ranges because each compressed bio is tightly | |
3028 | * coupled with a single extent map, and each range can have | |
3029 | * an extent map with a different offset value relative to the | |
3030 | * uncompressed data of our extent and different lengths. This | |
3031 | * is a corner case so we prioritize correctness over | |
3032 | * non-optimal behavior (submitting 2 bios for the same extent). | |
3033 | */ | |
3034 | if (test_bit(EXTENT_FLAG_COMPRESSED, &em->flags) && | |
3035 | prev_em_start && *prev_em_start != (u64)-1 && | |
3036 | *prev_em_start != em->orig_start) | |
3037 | force_bio_submit = true; | |
3038 | ||
3039 | if (prev_em_start) | |
3040 | *prev_em_start = em->orig_start; | |
3041 | ||
d1310b2e CM |
3042 | free_extent_map(em); |
3043 | em = NULL; | |
3044 | ||
3045 | /* we've found a hole, just zero and go on */ | |
3046 | if (block_start == EXTENT_MAP_HOLE) { | |
3047 | char *userpage; | |
507903b8 AJ |
3048 | struct extent_state *cached = NULL; |
3049 | ||
7ac687d9 | 3050 | userpage = kmap_atomic(page); |
306e16ce | 3051 | memset(userpage + pg_offset, 0, iosize); |
d1310b2e | 3052 | flush_dcache_page(page); |
7ac687d9 | 3053 | kunmap_atomic(userpage); |
d1310b2e CM |
3054 | |
3055 | set_extent_uptodate(tree, cur, cur + iosize - 1, | |
507903b8 | 3056 | &cached, GFP_NOFS); |
7f042a83 FM |
3057 | unlock_extent_cached(tree, cur, |
3058 | cur + iosize - 1, | |
3059 | &cached, GFP_NOFS); | |
d1310b2e | 3060 | cur = cur + iosize; |
306e16ce | 3061 | pg_offset += iosize; |
d1310b2e CM |
3062 | continue; |
3063 | } | |
3064 | /* the get_extent function already copied into the page */ | |
9655d298 CM |
3065 | if (test_range_bit(tree, cur, cur_end, |
3066 | EXTENT_UPTODATE, 1, NULL)) { | |
a1b32a59 | 3067 | check_page_uptodate(tree, page); |
7f042a83 | 3068 | unlock_extent(tree, cur, cur + iosize - 1); |
d1310b2e | 3069 | cur = cur + iosize; |
306e16ce | 3070 | pg_offset += iosize; |
d1310b2e CM |
3071 | continue; |
3072 | } | |
70dec807 CM |
3073 | /* we have an inline extent but it didn't get marked up |
3074 | * to date. Error out | |
3075 | */ | |
3076 | if (block_start == EXTENT_MAP_INLINE) { | |
3077 | SetPageError(page); | |
7f042a83 | 3078 | unlock_extent(tree, cur, cur + iosize - 1); |
70dec807 | 3079 | cur = cur + iosize; |
306e16ce | 3080 | pg_offset += iosize; |
70dec807 CM |
3081 | continue; |
3082 | } | |
d1310b2e | 3083 | |
1f7ad75b MC |
3084 | ret = submit_extent_page(REQ_OP_READ, read_flags, tree, NULL, |
3085 | page, sector, disk_io_size, pg_offset, | |
c2df8bb4 | 3086 | bdev, bio, |
c8b97818 CM |
3087 | end_bio_extent_readpage, mirror_num, |
3088 | *bio_flags, | |
005efedf FM |
3089 | this_bio_flag, |
3090 | force_bio_submit); | |
c8f2f24b JB |
3091 | if (!ret) { |
3092 | nr++; | |
3093 | *bio_flags = this_bio_flag; | |
3094 | } else { | |
d1310b2e | 3095 | SetPageError(page); |
7f042a83 | 3096 | unlock_extent(tree, cur, cur + iosize - 1); |
baf863b9 | 3097 | goto out; |
edd33c99 | 3098 | } |
d1310b2e | 3099 | cur = cur + iosize; |
306e16ce | 3100 | pg_offset += iosize; |
d1310b2e | 3101 | } |
90a887c9 | 3102 | out: |
d1310b2e CM |
3103 | if (!nr) { |
3104 | if (!PageError(page)) | |
3105 | SetPageUptodate(page); | |
3106 | unlock_page(page); | |
3107 | } | |
baf863b9 | 3108 | return ret; |
d1310b2e CM |
3109 | } |
3110 | ||
9974090b MX |
3111 | static inline void __do_contiguous_readpages(struct extent_io_tree *tree, |
3112 | struct page *pages[], int nr_pages, | |
3113 | u64 start, u64 end, | |
3114 | get_extent_t *get_extent, | |
125bac01 | 3115 | struct extent_map **em_cached, |
9974090b | 3116 | struct bio **bio, int mirror_num, |
1f7ad75b | 3117 | unsigned long *bio_flags, |
808f80b4 | 3118 | u64 *prev_em_start) |
9974090b MX |
3119 | { |
3120 | struct inode *inode; | |
3121 | struct btrfs_ordered_extent *ordered; | |
3122 | int index; | |
3123 | ||
3124 | inode = pages[0]->mapping->host; | |
3125 | while (1) { | |
3126 | lock_extent(tree, start, end); | |
a776c6fa | 3127 | ordered = btrfs_lookup_ordered_range(BTRFS_I(inode), start, |
9974090b MX |
3128 | end - start + 1); |
3129 | if (!ordered) | |
3130 | break; | |
3131 | unlock_extent(tree, start, end); | |
3132 | btrfs_start_ordered_extent(inode, ordered, 1); | |
3133 | btrfs_put_ordered_extent(ordered); | |
3134 | } | |
3135 | ||
3136 | for (index = 0; index < nr_pages; index++) { | |
125bac01 | 3137 | __do_readpage(tree, pages[index], get_extent, em_cached, bio, |
1f7ad75b | 3138 | mirror_num, bio_flags, 0, prev_em_start); |
09cbfeaf | 3139 | put_page(pages[index]); |
9974090b MX |
3140 | } |
3141 | } | |
3142 | ||
3143 | static void __extent_readpages(struct extent_io_tree *tree, | |
3144 | struct page *pages[], | |
3145 | int nr_pages, get_extent_t *get_extent, | |
125bac01 | 3146 | struct extent_map **em_cached, |
9974090b | 3147 | struct bio **bio, int mirror_num, |
1f7ad75b | 3148 | unsigned long *bio_flags, |
808f80b4 | 3149 | u64 *prev_em_start) |
9974090b | 3150 | { |
35a3621b | 3151 | u64 start = 0; |
9974090b MX |
3152 | u64 end = 0; |
3153 | u64 page_start; | |
3154 | int index; | |
35a3621b | 3155 | int first_index = 0; |
9974090b MX |
3156 | |
3157 | for (index = 0; index < nr_pages; index++) { | |
3158 | page_start = page_offset(pages[index]); | |
3159 | if (!end) { | |
3160 | start = page_start; | |
09cbfeaf | 3161 | end = start + PAGE_SIZE - 1; |
9974090b MX |
3162 | first_index = index; |
3163 | } else if (end + 1 == page_start) { | |
09cbfeaf | 3164 | end += PAGE_SIZE; |
9974090b MX |
3165 | } else { |
3166 | __do_contiguous_readpages(tree, &pages[first_index], | |
3167 | index - first_index, start, | |
125bac01 MX |
3168 | end, get_extent, em_cached, |
3169 | bio, mirror_num, bio_flags, | |
1f7ad75b | 3170 | prev_em_start); |
9974090b | 3171 | start = page_start; |
09cbfeaf | 3172 | end = start + PAGE_SIZE - 1; |
9974090b MX |
3173 | first_index = index; |
3174 | } | |
3175 | } | |
3176 | ||
3177 | if (end) | |
3178 | __do_contiguous_readpages(tree, &pages[first_index], | |
3179 | index - first_index, start, | |
125bac01 | 3180 | end, get_extent, em_cached, bio, |
1f7ad75b | 3181 | mirror_num, bio_flags, |
808f80b4 | 3182 | prev_em_start); |
9974090b MX |
3183 | } |
3184 | ||
3185 | static int __extent_read_full_page(struct extent_io_tree *tree, | |
3186 | struct page *page, | |
3187 | get_extent_t *get_extent, | |
3188 | struct bio **bio, int mirror_num, | |
1f7ad75b | 3189 | unsigned long *bio_flags, int read_flags) |
9974090b MX |
3190 | { |
3191 | struct inode *inode = page->mapping->host; | |
3192 | struct btrfs_ordered_extent *ordered; | |
3193 | u64 start = page_offset(page); | |
09cbfeaf | 3194 | u64 end = start + PAGE_SIZE - 1; |
9974090b MX |
3195 | int ret; |
3196 | ||
3197 | while (1) { | |
3198 | lock_extent(tree, start, end); | |
a776c6fa | 3199 | ordered = btrfs_lookup_ordered_range(BTRFS_I(inode), start, |
09cbfeaf | 3200 | PAGE_SIZE); |
9974090b MX |
3201 | if (!ordered) |
3202 | break; | |
3203 | unlock_extent(tree, start, end); | |
3204 | btrfs_start_ordered_extent(inode, ordered, 1); | |
3205 | btrfs_put_ordered_extent(ordered); | |
3206 | } | |
3207 | ||
125bac01 | 3208 | ret = __do_readpage(tree, page, get_extent, NULL, bio, mirror_num, |
1f7ad75b | 3209 | bio_flags, read_flags, NULL); |
9974090b MX |
3210 | return ret; |
3211 | } | |
3212 | ||
d1310b2e | 3213 | int extent_read_full_page(struct extent_io_tree *tree, struct page *page, |
8ddc7d9c | 3214 | get_extent_t *get_extent, int mirror_num) |
d1310b2e CM |
3215 | { |
3216 | struct bio *bio = NULL; | |
c8b97818 | 3217 | unsigned long bio_flags = 0; |
d1310b2e CM |
3218 | int ret; |
3219 | ||
8ddc7d9c | 3220 | ret = __extent_read_full_page(tree, page, get_extent, &bio, mirror_num, |
1f7ad75b | 3221 | &bio_flags, 0); |
d1310b2e | 3222 | if (bio) |
1f7ad75b | 3223 | ret = submit_one_bio(bio, mirror_num, bio_flags); |
d1310b2e CM |
3224 | return ret; |
3225 | } | |
d1310b2e | 3226 | |
3d4b9496 | 3227 | static void update_nr_written(struct writeback_control *wbc, |
a9132667 | 3228 | unsigned long nr_written) |
11c8349b CM |
3229 | { |
3230 | wbc->nr_to_write -= nr_written; | |
11c8349b CM |
3231 | } |
3232 | ||
d1310b2e | 3233 | /* |
40f76580 CM |
3234 | * helper for __extent_writepage, doing all of the delayed allocation setup. |
3235 | * | |
3236 | * This returns 1 if our fill_delalloc function did all the work required | |
3237 | * to write the page (copy into inline extent). In this case the IO has | |
3238 | * been started and the page is already unlocked. | |
3239 | * | |
3240 | * This returns 0 if all went well (page still locked) | |
3241 | * This returns < 0 if there were errors (page still locked) | |
d1310b2e | 3242 | */ |
40f76580 CM |
3243 | static noinline_for_stack int writepage_delalloc(struct inode *inode, |
3244 | struct page *page, struct writeback_control *wbc, | |
3245 | struct extent_page_data *epd, | |
3246 | u64 delalloc_start, | |
3247 | unsigned long *nr_written) | |
3248 | { | |
3249 | struct extent_io_tree *tree = epd->tree; | |
09cbfeaf | 3250 | u64 page_end = delalloc_start + PAGE_SIZE - 1; |
40f76580 CM |
3251 | u64 nr_delalloc; |
3252 | u64 delalloc_to_write = 0; | |
3253 | u64 delalloc_end = 0; | |
3254 | int ret; | |
3255 | int page_started = 0; | |
3256 | ||
3257 | if (epd->extent_locked || !tree->ops || !tree->ops->fill_delalloc) | |
3258 | return 0; | |
3259 | ||
3260 | while (delalloc_end < page_end) { | |
3261 | nr_delalloc = find_lock_delalloc_range(inode, tree, | |
3262 | page, | |
3263 | &delalloc_start, | |
3264 | &delalloc_end, | |
dcab6a3b | 3265 | BTRFS_MAX_EXTENT_SIZE); |
40f76580 CM |
3266 | if (nr_delalloc == 0) { |
3267 | delalloc_start = delalloc_end + 1; | |
3268 | continue; | |
3269 | } | |
3270 | ret = tree->ops->fill_delalloc(inode, page, | |
3271 | delalloc_start, | |
3272 | delalloc_end, | |
3273 | &page_started, | |
3274 | nr_written); | |
3275 | /* File system has been set read-only */ | |
3276 | if (ret) { | |
3277 | SetPageError(page); | |
3278 | /* fill_delalloc should be return < 0 for error | |
3279 | * but just in case, we use > 0 here meaning the | |
3280 | * IO is started, so we don't want to return > 0 | |
3281 | * unless things are going well. | |
3282 | */ | |
3283 | ret = ret < 0 ? ret : -EIO; | |
3284 | goto done; | |
3285 | } | |
3286 | /* | |
ea1754a0 KS |
3287 | * delalloc_end is already one less than the total length, so |
3288 | * we don't subtract one from PAGE_SIZE | |
40f76580 CM |
3289 | */ |
3290 | delalloc_to_write += (delalloc_end - delalloc_start + | |
ea1754a0 | 3291 | PAGE_SIZE) >> PAGE_SHIFT; |
40f76580 CM |
3292 | delalloc_start = delalloc_end + 1; |
3293 | } | |
3294 | if (wbc->nr_to_write < delalloc_to_write) { | |
3295 | int thresh = 8192; | |
3296 | ||
3297 | if (delalloc_to_write < thresh * 2) | |
3298 | thresh = delalloc_to_write; | |
3299 | wbc->nr_to_write = min_t(u64, delalloc_to_write, | |
3300 | thresh); | |
3301 | } | |
3302 | ||
3303 | /* did the fill delalloc function already unlock and start | |
3304 | * the IO? | |
3305 | */ | |
3306 | if (page_started) { | |
3307 | /* | |
3308 | * we've unlocked the page, so we can't update | |
3309 | * the mapping's writeback index, just update | |
3310 | * nr_to_write. | |
3311 | */ | |
3312 | wbc->nr_to_write -= *nr_written; | |
3313 | return 1; | |
3314 | } | |
3315 | ||
3316 | ret = 0; | |
3317 | ||
3318 | done: | |
3319 | return ret; | |
3320 | } | |
3321 | ||
3322 | /* | |
3323 | * helper for __extent_writepage. This calls the writepage start hooks, | |
3324 | * and does the loop to map the page into extents and bios. | |
3325 | * | |
3326 | * We return 1 if the IO is started and the page is unlocked, | |
3327 | * 0 if all went well (page still locked) | |
3328 | * < 0 if there were errors (page still locked) | |
3329 | */ | |
3330 | static noinline_for_stack int __extent_writepage_io(struct inode *inode, | |
3331 | struct page *page, | |
3332 | struct writeback_control *wbc, | |
3333 | struct extent_page_data *epd, | |
3334 | loff_t i_size, | |
3335 | unsigned long nr_written, | |
3336 | int write_flags, int *nr_ret) | |
d1310b2e | 3337 | { |
d1310b2e | 3338 | struct extent_io_tree *tree = epd->tree; |
4eee4fa4 | 3339 | u64 start = page_offset(page); |
09cbfeaf | 3340 | u64 page_end = start + PAGE_SIZE - 1; |
d1310b2e CM |
3341 | u64 end; |
3342 | u64 cur = start; | |
3343 | u64 extent_offset; | |
d1310b2e CM |
3344 | u64 block_start; |
3345 | u64 iosize; | |
3346 | sector_t sector; | |
3347 | struct extent_map *em; | |
3348 | struct block_device *bdev; | |
7f3c74fb | 3349 | size_t pg_offset = 0; |
d1310b2e | 3350 | size_t blocksize; |
40f76580 CM |
3351 | int ret = 0; |
3352 | int nr = 0; | |
3353 | bool compressed; | |
c8b97818 | 3354 | |
247e743c | 3355 | if (tree->ops && tree->ops->writepage_start_hook) { |
c8b97818 CM |
3356 | ret = tree->ops->writepage_start_hook(page, start, |
3357 | page_end); | |
87826df0 JM |
3358 | if (ret) { |
3359 | /* Fixup worker will requeue */ | |
3360 | if (ret == -EBUSY) | |
3361 | wbc->pages_skipped++; | |
3362 | else | |
3363 | redirty_page_for_writepage(wbc, page); | |
40f76580 | 3364 | |
3d4b9496 | 3365 | update_nr_written(wbc, nr_written); |
247e743c | 3366 | unlock_page(page); |
bcf93489 | 3367 | return 1; |
247e743c CM |
3368 | } |
3369 | } | |
3370 | ||
11c8349b CM |
3371 | /* |
3372 | * we don't want to touch the inode after unlocking the page, | |
3373 | * so we update the mapping writeback index now | |
3374 | */ | |
3d4b9496 | 3375 | update_nr_written(wbc, nr_written + 1); |
771ed689 | 3376 | |
d1310b2e | 3377 | end = page_end; |
40f76580 | 3378 | if (i_size <= start) { |
e6dcd2dc CM |
3379 | if (tree->ops && tree->ops->writepage_end_io_hook) |
3380 | tree->ops->writepage_end_io_hook(page, start, | |
3381 | page_end, NULL, 1); | |
d1310b2e CM |
3382 | goto done; |
3383 | } | |
3384 | ||
d1310b2e CM |
3385 | blocksize = inode->i_sb->s_blocksize; |
3386 | ||
3387 | while (cur <= end) { | |
40f76580 | 3388 | u64 em_end; |
58409edd | 3389 | |
40f76580 | 3390 | if (cur >= i_size) { |
e6dcd2dc CM |
3391 | if (tree->ops && tree->ops->writepage_end_io_hook) |
3392 | tree->ops->writepage_end_io_hook(page, cur, | |
3393 | page_end, NULL, 1); | |
d1310b2e CM |
3394 | break; |
3395 | } | |
fc4f21b1 | 3396 | em = epd->get_extent(BTRFS_I(inode), page, pg_offset, cur, |
d1310b2e | 3397 | end - cur + 1, 1); |
c704005d | 3398 | if (IS_ERR_OR_NULL(em)) { |
d1310b2e | 3399 | SetPageError(page); |
61391d56 | 3400 | ret = PTR_ERR_OR_ZERO(em); |
d1310b2e CM |
3401 | break; |
3402 | } | |
3403 | ||
3404 | extent_offset = cur - em->start; | |
40f76580 CM |
3405 | em_end = extent_map_end(em); |
3406 | BUG_ON(em_end <= cur); | |
d1310b2e | 3407 | BUG_ON(end < cur); |
40f76580 | 3408 | iosize = min(em_end - cur, end - cur + 1); |
fda2832f | 3409 | iosize = ALIGN(iosize, blocksize); |
d1310b2e CM |
3410 | sector = (em->block_start + extent_offset) >> 9; |
3411 | bdev = em->bdev; | |
3412 | block_start = em->block_start; | |
c8b97818 | 3413 | compressed = test_bit(EXTENT_FLAG_COMPRESSED, &em->flags); |
d1310b2e CM |
3414 | free_extent_map(em); |
3415 | em = NULL; | |
3416 | ||
c8b97818 CM |
3417 | /* |
3418 | * compressed and inline extents are written through other | |
3419 | * paths in the FS | |
3420 | */ | |
3421 | if (compressed || block_start == EXTENT_MAP_HOLE || | |
d1310b2e | 3422 | block_start == EXTENT_MAP_INLINE) { |
c8b97818 CM |
3423 | /* |
3424 | * end_io notification does not happen here for | |
3425 | * compressed extents | |
3426 | */ | |
3427 | if (!compressed && tree->ops && | |
3428 | tree->ops->writepage_end_io_hook) | |
e6dcd2dc CM |
3429 | tree->ops->writepage_end_io_hook(page, cur, |
3430 | cur + iosize - 1, | |
3431 | NULL, 1); | |
c8b97818 CM |
3432 | else if (compressed) { |
3433 | /* we don't want to end_page_writeback on | |
3434 | * a compressed extent. this happens | |
3435 | * elsewhere | |
3436 | */ | |
3437 | nr++; | |
3438 | } | |
3439 | ||
3440 | cur += iosize; | |
7f3c74fb | 3441 | pg_offset += iosize; |
d1310b2e CM |
3442 | continue; |
3443 | } | |
c8b97818 | 3444 | |
58409edd DS |
3445 | set_range_writeback(tree, cur, cur + iosize - 1); |
3446 | if (!PageWriteback(page)) { | |
3447 | btrfs_err(BTRFS_I(inode)->root->fs_info, | |
3448 | "page %lu not writeback, cur %llu end %llu", | |
3449 | page->index, cur, end); | |
d1310b2e | 3450 | } |
7f3c74fb | 3451 | |
1f7ad75b MC |
3452 | ret = submit_extent_page(REQ_OP_WRITE, write_flags, tree, wbc, |
3453 | page, sector, iosize, pg_offset, | |
c2df8bb4 | 3454 | bdev, &epd->bio, |
58409edd DS |
3455 | end_bio_extent_writepage, |
3456 | 0, 0, 0, false); | |
fe01aa65 | 3457 | if (ret) { |
58409edd | 3458 | SetPageError(page); |
fe01aa65 TK |
3459 | if (PageWriteback(page)) |
3460 | end_page_writeback(page); | |
3461 | } | |
d1310b2e | 3462 | |
d1310b2e | 3463 | cur = cur + iosize; |
7f3c74fb | 3464 | pg_offset += iosize; |
d1310b2e CM |
3465 | nr++; |
3466 | } | |
40f76580 CM |
3467 | done: |
3468 | *nr_ret = nr; | |
40f76580 CM |
3469 | return ret; |
3470 | } | |
3471 | ||
3472 | /* | |
3473 | * the writepage semantics are similar to regular writepage. extent | |
3474 | * records are inserted to lock ranges in the tree, and as dirty areas | |
3475 | * are found, they are marked writeback. Then the lock bits are removed | |
3476 | * and the end_io handler clears the writeback ranges | |
3477 | */ | |
3478 | static int __extent_writepage(struct page *page, struct writeback_control *wbc, | |
3479 | void *data) | |
3480 | { | |
3481 | struct inode *inode = page->mapping->host; | |
3482 | struct extent_page_data *epd = data; | |
3483 | u64 start = page_offset(page); | |
09cbfeaf | 3484 | u64 page_end = start + PAGE_SIZE - 1; |
40f76580 CM |
3485 | int ret; |
3486 | int nr = 0; | |
3487 | size_t pg_offset = 0; | |
3488 | loff_t i_size = i_size_read(inode); | |
09cbfeaf | 3489 | unsigned long end_index = i_size >> PAGE_SHIFT; |
1f7ad75b | 3490 | int write_flags = 0; |
40f76580 CM |
3491 | unsigned long nr_written = 0; |
3492 | ||
3493 | if (wbc->sync_mode == WB_SYNC_ALL) | |
70fd7614 | 3494 | write_flags = REQ_SYNC; |
40f76580 CM |
3495 | |
3496 | trace___extent_writepage(page, inode, wbc); | |
3497 | ||
3498 | WARN_ON(!PageLocked(page)); | |
3499 | ||
3500 | ClearPageError(page); | |
3501 | ||
09cbfeaf | 3502 | pg_offset = i_size & (PAGE_SIZE - 1); |
40f76580 CM |
3503 | if (page->index > end_index || |
3504 | (page->index == end_index && !pg_offset)) { | |
09cbfeaf | 3505 | page->mapping->a_ops->invalidatepage(page, 0, PAGE_SIZE); |
40f76580 CM |
3506 | unlock_page(page); |
3507 | return 0; | |
3508 | } | |
3509 | ||
3510 | if (page->index == end_index) { | |
3511 | char *userpage; | |
3512 | ||
3513 | userpage = kmap_atomic(page); | |
3514 | memset(userpage + pg_offset, 0, | |
09cbfeaf | 3515 | PAGE_SIZE - pg_offset); |
40f76580 CM |
3516 | kunmap_atomic(userpage); |
3517 | flush_dcache_page(page); | |
3518 | } | |
3519 | ||
3520 | pg_offset = 0; | |
3521 | ||
3522 | set_page_extent_mapped(page); | |
3523 | ||
3524 | ret = writepage_delalloc(inode, page, wbc, epd, start, &nr_written); | |
3525 | if (ret == 1) | |
3526 | goto done_unlocked; | |
3527 | if (ret) | |
3528 | goto done; | |
3529 | ||
3530 | ret = __extent_writepage_io(inode, page, wbc, epd, | |
3531 | i_size, nr_written, write_flags, &nr); | |
3532 | if (ret == 1) | |
3533 | goto done_unlocked; | |
3534 | ||
d1310b2e CM |
3535 | done: |
3536 | if (nr == 0) { | |
3537 | /* make sure the mapping tag for page dirty gets cleared */ | |
3538 | set_page_writeback(page); | |
3539 | end_page_writeback(page); | |
3540 | } | |
61391d56 FM |
3541 | if (PageError(page)) { |
3542 | ret = ret < 0 ? ret : -EIO; | |
3543 | end_extent_writepage(page, ret, start, page_end); | |
3544 | } | |
d1310b2e | 3545 | unlock_page(page); |
40f76580 | 3546 | return ret; |
771ed689 | 3547 | |
11c8349b | 3548 | done_unlocked: |
d1310b2e CM |
3549 | return 0; |
3550 | } | |
3551 | ||
fd8b2b61 | 3552 | void wait_on_extent_buffer_writeback(struct extent_buffer *eb) |
0b32f4bb | 3553 | { |
74316201 N |
3554 | wait_on_bit_io(&eb->bflags, EXTENT_BUFFER_WRITEBACK, |
3555 | TASK_UNINTERRUPTIBLE); | |
0b32f4bb JB |
3556 | } |
3557 | ||
0e378df1 CM |
3558 | static noinline_for_stack int |
3559 | lock_extent_buffer_for_io(struct extent_buffer *eb, | |
3560 | struct btrfs_fs_info *fs_info, | |
3561 | struct extent_page_data *epd) | |
0b32f4bb JB |
3562 | { |
3563 | unsigned long i, num_pages; | |
3564 | int flush = 0; | |
3565 | int ret = 0; | |
3566 | ||
3567 | if (!btrfs_try_tree_write_lock(eb)) { | |
3568 | flush = 1; | |
3569 | flush_write_bio(epd); | |
3570 | btrfs_tree_lock(eb); | |
3571 | } | |
3572 | ||
3573 | if (test_bit(EXTENT_BUFFER_WRITEBACK, &eb->bflags)) { | |
3574 | btrfs_tree_unlock(eb); | |
3575 | if (!epd->sync_io) | |
3576 | return 0; | |
3577 | if (!flush) { | |
3578 | flush_write_bio(epd); | |
3579 | flush = 1; | |
3580 | } | |
a098d8e8 CM |
3581 | while (1) { |
3582 | wait_on_extent_buffer_writeback(eb); | |
3583 | btrfs_tree_lock(eb); | |
3584 | if (!test_bit(EXTENT_BUFFER_WRITEBACK, &eb->bflags)) | |
3585 | break; | |
0b32f4bb | 3586 | btrfs_tree_unlock(eb); |
0b32f4bb JB |
3587 | } |
3588 | } | |
3589 | ||
51561ffe JB |
3590 | /* |
3591 | * We need to do this to prevent races in people who check if the eb is | |
3592 | * under IO since we can end up having no IO bits set for a short period | |
3593 | * of time. | |
3594 | */ | |
3595 | spin_lock(&eb->refs_lock); | |
0b32f4bb JB |
3596 | if (test_and_clear_bit(EXTENT_BUFFER_DIRTY, &eb->bflags)) { |
3597 | set_bit(EXTENT_BUFFER_WRITEBACK, &eb->bflags); | |
51561ffe | 3598 | spin_unlock(&eb->refs_lock); |
0b32f4bb | 3599 | btrfs_set_header_flag(eb, BTRFS_HEADER_FLAG_WRITTEN); |
e2d84521 MX |
3600 | __percpu_counter_add(&fs_info->dirty_metadata_bytes, |
3601 | -eb->len, | |
3602 | fs_info->dirty_metadata_batch); | |
0b32f4bb | 3603 | ret = 1; |
51561ffe JB |
3604 | } else { |
3605 | spin_unlock(&eb->refs_lock); | |
0b32f4bb JB |
3606 | } |
3607 | ||
3608 | btrfs_tree_unlock(eb); | |
3609 | ||
3610 | if (!ret) | |
3611 | return ret; | |
3612 | ||
3613 | num_pages = num_extent_pages(eb->start, eb->len); | |
3614 | for (i = 0; i < num_pages; i++) { | |
fb85fc9a | 3615 | struct page *p = eb->pages[i]; |
0b32f4bb JB |
3616 | |
3617 | if (!trylock_page(p)) { | |
3618 | if (!flush) { | |
3619 | flush_write_bio(epd); | |
3620 | flush = 1; | |
3621 | } | |
3622 | lock_page(p); | |
3623 | } | |
3624 | } | |
3625 | ||
3626 | return ret; | |
3627 | } | |
3628 | ||
3629 | static void end_extent_buffer_writeback(struct extent_buffer *eb) | |
3630 | { | |
3631 | clear_bit(EXTENT_BUFFER_WRITEBACK, &eb->bflags); | |
4e857c58 | 3632 | smp_mb__after_atomic(); |
0b32f4bb JB |
3633 | wake_up_bit(&eb->bflags, EXTENT_BUFFER_WRITEBACK); |
3634 | } | |
3635 | ||
656f30db FM |
3636 | static void set_btree_ioerr(struct page *page) |
3637 | { | |
3638 | struct extent_buffer *eb = (struct extent_buffer *)page->private; | |
656f30db FM |
3639 | |
3640 | SetPageError(page); | |
3641 | if (test_and_set_bit(EXTENT_BUFFER_WRITE_ERR, &eb->bflags)) | |
3642 | return; | |
3643 | ||
3644 | /* | |
3645 | * If writeback for a btree extent that doesn't belong to a log tree | |
3646 | * failed, increment the counter transaction->eb_write_errors. | |
3647 | * We do this because while the transaction is running and before it's | |
3648 | * committing (when we call filemap_fdata[write|wait]_range against | |
3649 | * the btree inode), we might have | |
3650 | * btree_inode->i_mapping->a_ops->writepages() called by the VM - if it | |
3651 | * returns an error or an error happens during writeback, when we're | |
3652 | * committing the transaction we wouldn't know about it, since the pages | |
3653 | * can be no longer dirty nor marked anymore for writeback (if a | |
3654 | * subsequent modification to the extent buffer didn't happen before the | |
3655 | * transaction commit), which makes filemap_fdata[write|wait]_range not | |
3656 | * able to find the pages tagged with SetPageError at transaction | |
3657 | * commit time. So if this happens we must abort the transaction, | |
3658 | * otherwise we commit a super block with btree roots that point to | |
3659 | * btree nodes/leafs whose content on disk is invalid - either garbage | |
3660 | * or the content of some node/leaf from a past generation that got | |
3661 | * cowed or deleted and is no longer valid. | |
3662 | * | |
3663 | * Note: setting AS_EIO/AS_ENOSPC in the btree inode's i_mapping would | |
3664 | * not be enough - we need to distinguish between log tree extents vs | |
3665 | * non-log tree extents, and the next filemap_fdatawait_range() call | |
3666 | * will catch and clear such errors in the mapping - and that call might | |
3667 | * be from a log sync and not from a transaction commit. Also, checking | |
3668 | * for the eb flag EXTENT_BUFFER_WRITE_ERR at transaction commit time is | |
3669 | * not done and would not be reliable - the eb might have been released | |
3670 | * from memory and reading it back again means that flag would not be | |
3671 | * set (since it's a runtime flag, not persisted on disk). | |
3672 | * | |
3673 | * Using the flags below in the btree inode also makes us achieve the | |
3674 | * goal of AS_EIO/AS_ENOSPC when writepages() returns success, started | |
3675 | * writeback for all dirty pages and before filemap_fdatawait_range() | |
3676 | * is called, the writeback for all dirty pages had already finished | |
3677 | * with errors - because we were not using AS_EIO/AS_ENOSPC, | |
3678 | * filemap_fdatawait_range() would return success, as it could not know | |
3679 | * that writeback errors happened (the pages were no longer tagged for | |
3680 | * writeback). | |
3681 | */ | |
3682 | switch (eb->log_index) { | |
3683 | case -1: | |
afcdd129 | 3684 | set_bit(BTRFS_FS_BTREE_ERR, &eb->fs_info->flags); |
656f30db FM |
3685 | break; |
3686 | case 0: | |
afcdd129 | 3687 | set_bit(BTRFS_FS_LOG1_ERR, &eb->fs_info->flags); |
656f30db FM |
3688 | break; |
3689 | case 1: | |
afcdd129 | 3690 | set_bit(BTRFS_FS_LOG2_ERR, &eb->fs_info->flags); |
656f30db FM |
3691 | break; |
3692 | default: | |
3693 | BUG(); /* unexpected, logic error */ | |
3694 | } | |
3695 | } | |
3696 | ||
4246a0b6 | 3697 | static void end_bio_extent_buffer_writepage(struct bio *bio) |
0b32f4bb | 3698 | { |
2c30c71b | 3699 | struct bio_vec *bvec; |
0b32f4bb | 3700 | struct extent_buffer *eb; |
2c30c71b | 3701 | int i, done; |
0b32f4bb | 3702 | |
2c30c71b | 3703 | bio_for_each_segment_all(bvec, bio, i) { |
0b32f4bb JB |
3704 | struct page *page = bvec->bv_page; |
3705 | ||
0b32f4bb JB |
3706 | eb = (struct extent_buffer *)page->private; |
3707 | BUG_ON(!eb); | |
3708 | done = atomic_dec_and_test(&eb->io_pages); | |
3709 | ||
4246a0b6 CH |
3710 | if (bio->bi_error || |
3711 | test_bit(EXTENT_BUFFER_WRITE_ERR, &eb->bflags)) { | |
0b32f4bb | 3712 | ClearPageUptodate(page); |
656f30db | 3713 | set_btree_ioerr(page); |
0b32f4bb JB |
3714 | } |
3715 | ||
3716 | end_page_writeback(page); | |
3717 | ||
3718 | if (!done) | |
3719 | continue; | |
3720 | ||
3721 | end_extent_buffer_writeback(eb); | |
2c30c71b | 3722 | } |
0b32f4bb JB |
3723 | |
3724 | bio_put(bio); | |
0b32f4bb JB |
3725 | } |
3726 | ||
0e378df1 | 3727 | static noinline_for_stack int write_one_eb(struct extent_buffer *eb, |
0b32f4bb JB |
3728 | struct btrfs_fs_info *fs_info, |
3729 | struct writeback_control *wbc, | |
3730 | struct extent_page_data *epd) | |
3731 | { | |
3732 | struct block_device *bdev = fs_info->fs_devices->latest_bdev; | |
f28491e0 | 3733 | struct extent_io_tree *tree = &BTRFS_I(fs_info->btree_inode)->io_tree; |
0b32f4bb | 3734 | u64 offset = eb->start; |
851cd173 | 3735 | u32 nritems; |
0b32f4bb | 3736 | unsigned long i, num_pages; |
de0022b9 | 3737 | unsigned long bio_flags = 0; |
851cd173 | 3738 | unsigned long start, end; |
70fd7614 | 3739 | int write_flags = (epd->sync_io ? REQ_SYNC : 0) | REQ_META; |
d7dbe9e7 | 3740 | int ret = 0; |
0b32f4bb | 3741 | |
656f30db | 3742 | clear_bit(EXTENT_BUFFER_WRITE_ERR, &eb->bflags); |
0b32f4bb JB |
3743 | num_pages = num_extent_pages(eb->start, eb->len); |
3744 | atomic_set(&eb->io_pages, num_pages); | |
de0022b9 JB |
3745 | if (btrfs_header_owner(eb) == BTRFS_TREE_LOG_OBJECTID) |
3746 | bio_flags = EXTENT_BIO_TREE_LOG; | |
3747 | ||
851cd173 LB |
3748 | /* set btree blocks beyond nritems with 0 to avoid stale content. */ |
3749 | nritems = btrfs_header_nritems(eb); | |
3eb548ee | 3750 | if (btrfs_header_level(eb) > 0) { |
3eb548ee LB |
3751 | end = btrfs_node_key_ptr_offset(nritems); |
3752 | ||
b159fa28 | 3753 | memzero_extent_buffer(eb, end, eb->len - end); |
851cd173 LB |
3754 | } else { |
3755 | /* | |
3756 | * leaf: | |
3757 | * header 0 1 2 .. N ... data_N .. data_2 data_1 data_0 | |
3758 | */ | |
3759 | start = btrfs_item_nr_offset(nritems); | |
2ff7e61e | 3760 | end = btrfs_leaf_data(eb) + leaf_data_end(fs_info, eb); |
b159fa28 | 3761 | memzero_extent_buffer(eb, start, end - start); |
3eb548ee LB |
3762 | } |
3763 | ||
0b32f4bb | 3764 | for (i = 0; i < num_pages; i++) { |
fb85fc9a | 3765 | struct page *p = eb->pages[i]; |
0b32f4bb JB |
3766 | |
3767 | clear_page_dirty_for_io(p); | |
3768 | set_page_writeback(p); | |
1f7ad75b MC |
3769 | ret = submit_extent_page(REQ_OP_WRITE, write_flags, tree, wbc, |
3770 | p, offset >> 9, PAGE_SIZE, 0, bdev, | |
c2df8bb4 | 3771 | &epd->bio, |
1f7ad75b | 3772 | end_bio_extent_buffer_writepage, |
005efedf | 3773 | 0, epd->bio_flags, bio_flags, false); |
de0022b9 | 3774 | epd->bio_flags = bio_flags; |
0b32f4bb | 3775 | if (ret) { |
656f30db | 3776 | set_btree_ioerr(p); |
fe01aa65 TK |
3777 | if (PageWriteback(p)) |
3778 | end_page_writeback(p); | |
0b32f4bb JB |
3779 | if (atomic_sub_and_test(num_pages - i, &eb->io_pages)) |
3780 | end_extent_buffer_writeback(eb); | |
3781 | ret = -EIO; | |
3782 | break; | |
3783 | } | |
09cbfeaf | 3784 | offset += PAGE_SIZE; |
3d4b9496 | 3785 | update_nr_written(wbc, 1); |
0b32f4bb JB |
3786 | unlock_page(p); |
3787 | } | |
3788 | ||
3789 | if (unlikely(ret)) { | |
3790 | for (; i < num_pages; i++) { | |
bbf65cf0 | 3791 | struct page *p = eb->pages[i]; |
81465028 | 3792 | clear_page_dirty_for_io(p); |
0b32f4bb JB |
3793 | unlock_page(p); |
3794 | } | |
3795 | } | |
3796 | ||
3797 | return ret; | |
3798 | } | |
3799 | ||
3800 | int btree_write_cache_pages(struct address_space *mapping, | |
3801 | struct writeback_control *wbc) | |
3802 | { | |
3803 | struct extent_io_tree *tree = &BTRFS_I(mapping->host)->io_tree; | |
3804 | struct btrfs_fs_info *fs_info = BTRFS_I(mapping->host)->root->fs_info; | |
3805 | struct extent_buffer *eb, *prev_eb = NULL; | |
3806 | struct extent_page_data epd = { | |
3807 | .bio = NULL, | |
3808 | .tree = tree, | |
3809 | .extent_locked = 0, | |
3810 | .sync_io = wbc->sync_mode == WB_SYNC_ALL, | |
de0022b9 | 3811 | .bio_flags = 0, |
0b32f4bb JB |
3812 | }; |
3813 | int ret = 0; | |
3814 | int done = 0; | |
3815 | int nr_to_write_done = 0; | |
3816 | struct pagevec pvec; | |
3817 | int nr_pages; | |
3818 | pgoff_t index; | |
3819 | pgoff_t end; /* Inclusive */ | |
3820 | int scanned = 0; | |
3821 | int tag; | |
3822 | ||
3823 | pagevec_init(&pvec, 0); | |
3824 | if (wbc->range_cyclic) { | |
3825 | index = mapping->writeback_index; /* Start from prev offset */ | |
3826 | end = -1; | |
3827 | } else { | |
09cbfeaf KS |
3828 | index = wbc->range_start >> PAGE_SHIFT; |
3829 | end = wbc->range_end >> PAGE_SHIFT; | |
0b32f4bb JB |
3830 | scanned = 1; |
3831 | } | |
3832 | if (wbc->sync_mode == WB_SYNC_ALL) | |
3833 | tag = PAGECACHE_TAG_TOWRITE; | |
3834 | else | |
3835 | tag = PAGECACHE_TAG_DIRTY; | |
3836 | retry: | |
3837 | if (wbc->sync_mode == WB_SYNC_ALL) | |
3838 | tag_pages_for_writeback(mapping, index, end); | |
3839 | while (!done && !nr_to_write_done && (index <= end) && | |
3840 | (nr_pages = pagevec_lookup_tag(&pvec, mapping, &index, tag, | |
3841 | min(end - index, (pgoff_t)PAGEVEC_SIZE-1) + 1))) { | |
3842 | unsigned i; | |
3843 | ||
3844 | scanned = 1; | |
3845 | for (i = 0; i < nr_pages; i++) { | |
3846 | struct page *page = pvec.pages[i]; | |
3847 | ||
3848 | if (!PagePrivate(page)) | |
3849 | continue; | |
3850 | ||
3851 | if (!wbc->range_cyclic && page->index > end) { | |
3852 | done = 1; | |
3853 | break; | |
3854 | } | |
3855 | ||
b5bae261 JB |
3856 | spin_lock(&mapping->private_lock); |
3857 | if (!PagePrivate(page)) { | |
3858 | spin_unlock(&mapping->private_lock); | |
3859 | continue; | |
3860 | } | |
3861 | ||
0b32f4bb | 3862 | eb = (struct extent_buffer *)page->private; |
b5bae261 JB |
3863 | |
3864 | /* | |
3865 | * Shouldn't happen and normally this would be a BUG_ON | |
3866 | * but no sense in crashing the users box for something | |
3867 | * we can survive anyway. | |
3868 | */ | |
fae7f21c | 3869 | if (WARN_ON(!eb)) { |
b5bae261 | 3870 | spin_unlock(&mapping->private_lock); |
0b32f4bb JB |
3871 | continue; |
3872 | } | |
3873 | ||
b5bae261 JB |
3874 | if (eb == prev_eb) { |
3875 | spin_unlock(&mapping->private_lock); | |
0b32f4bb | 3876 | continue; |
b5bae261 | 3877 | } |
0b32f4bb | 3878 | |
b5bae261 JB |
3879 | ret = atomic_inc_not_zero(&eb->refs); |
3880 | spin_unlock(&mapping->private_lock); | |
3881 | if (!ret) | |
0b32f4bb | 3882 | continue; |
0b32f4bb JB |
3883 | |
3884 | prev_eb = eb; | |
3885 | ret = lock_extent_buffer_for_io(eb, fs_info, &epd); | |
3886 | if (!ret) { | |
3887 | free_extent_buffer(eb); | |
3888 | continue; | |
3889 | } | |
3890 | ||
3891 | ret = write_one_eb(eb, fs_info, wbc, &epd); | |
3892 | if (ret) { | |
3893 | done = 1; | |
3894 | free_extent_buffer(eb); | |
3895 | break; | |
3896 | } | |
3897 | free_extent_buffer(eb); | |
3898 | ||
3899 | /* | |
3900 | * the filesystem may choose to bump up nr_to_write. | |
3901 | * We have to make sure to honor the new nr_to_write | |
3902 | * at any time | |
3903 | */ | |
3904 | nr_to_write_done = wbc->nr_to_write <= 0; | |
3905 | } | |
3906 | pagevec_release(&pvec); | |
3907 | cond_resched(); | |
3908 | } | |
3909 | if (!scanned && !done) { | |
3910 | /* | |
3911 | * We hit the last page and there is more work to be done: wrap | |
3912 | * back to the start of the file | |
3913 | */ | |
3914 | scanned = 1; | |
3915 | index = 0; | |
3916 | goto retry; | |
3917 | } | |
3918 | flush_write_bio(&epd); | |
3919 | return ret; | |
3920 | } | |
3921 | ||
d1310b2e | 3922 | /** |
4bef0848 | 3923 | * write_cache_pages - walk the list of dirty pages of the given address space and write all of them. |
d1310b2e CM |
3924 | * @mapping: address space structure to write |
3925 | * @wbc: subtract the number of written pages from *@wbc->nr_to_write | |
3926 | * @writepage: function called for each page | |
3927 | * @data: data passed to writepage function | |
3928 | * | |
3929 | * If a page is already under I/O, write_cache_pages() skips it, even | |
3930 | * if it's dirty. This is desirable behaviour for memory-cleaning writeback, | |
3931 | * but it is INCORRECT for data-integrity system calls such as fsync(). fsync() | |
3932 | * and msync() need to guarantee that all the data which was dirty at the time | |
3933 | * the call was made get new I/O started against them. If wbc->sync_mode is | |
3934 | * WB_SYNC_ALL then we were called for data integrity and we must wait for | |
3935 | * existing IO to complete. | |
3936 | */ | |
4242b64a | 3937 | static int extent_write_cache_pages(struct address_space *mapping, |
4bef0848 | 3938 | struct writeback_control *wbc, |
d2c3f4f6 CM |
3939 | writepage_t writepage, void *data, |
3940 | void (*flush_fn)(void *)) | |
d1310b2e | 3941 | { |
7fd1a3f7 | 3942 | struct inode *inode = mapping->host; |
d1310b2e CM |
3943 | int ret = 0; |
3944 | int done = 0; | |
f85d7d6c | 3945 | int nr_to_write_done = 0; |
d1310b2e CM |
3946 | struct pagevec pvec; |
3947 | int nr_pages; | |
3948 | pgoff_t index; | |
3949 | pgoff_t end; /* Inclusive */ | |
a9132667 LB |
3950 | pgoff_t done_index; |
3951 | int range_whole = 0; | |
d1310b2e | 3952 | int scanned = 0; |
f7aaa06b | 3953 | int tag; |
d1310b2e | 3954 | |
7fd1a3f7 JB |
3955 | /* |
3956 | * We have to hold onto the inode so that ordered extents can do their | |
3957 | * work when the IO finishes. The alternative to this is failing to add | |
3958 | * an ordered extent if the igrab() fails there and that is a huge pain | |
3959 | * to deal with, so instead just hold onto the inode throughout the | |
3960 | * writepages operation. If it fails here we are freeing up the inode | |
3961 | * anyway and we'd rather not waste our time writing out stuff that is | |
3962 | * going to be truncated anyway. | |
3963 | */ | |
3964 | if (!igrab(inode)) | |
3965 | return 0; | |
3966 | ||
d1310b2e CM |
3967 | pagevec_init(&pvec, 0); |
3968 | if (wbc->range_cyclic) { | |
3969 | index = mapping->writeback_index; /* Start from prev offset */ | |
3970 | end = -1; | |
3971 | } else { | |
09cbfeaf KS |
3972 | index = wbc->range_start >> PAGE_SHIFT; |
3973 | end = wbc->range_end >> PAGE_SHIFT; | |
a9132667 LB |
3974 | if (wbc->range_start == 0 && wbc->range_end == LLONG_MAX) |
3975 | range_whole = 1; | |
d1310b2e CM |
3976 | scanned = 1; |
3977 | } | |
f7aaa06b JB |
3978 | if (wbc->sync_mode == WB_SYNC_ALL) |
3979 | tag = PAGECACHE_TAG_TOWRITE; | |
3980 | else | |
3981 | tag = PAGECACHE_TAG_DIRTY; | |
d1310b2e | 3982 | retry: |
f7aaa06b JB |
3983 | if (wbc->sync_mode == WB_SYNC_ALL) |
3984 | tag_pages_for_writeback(mapping, index, end); | |
a9132667 | 3985 | done_index = index; |
f85d7d6c | 3986 | while (!done && !nr_to_write_done && (index <= end) && |
f7aaa06b JB |
3987 | (nr_pages = pagevec_lookup_tag(&pvec, mapping, &index, tag, |
3988 | min(end - index, (pgoff_t)PAGEVEC_SIZE-1) + 1))) { | |
d1310b2e CM |
3989 | unsigned i; |
3990 | ||
3991 | scanned = 1; | |
3992 | for (i = 0; i < nr_pages; i++) { | |
3993 | struct page *page = pvec.pages[i]; | |
3994 | ||
a9132667 | 3995 | done_index = page->index; |
d1310b2e CM |
3996 | /* |
3997 | * At this point we hold neither mapping->tree_lock nor | |
3998 | * lock on the page itself: the page may be truncated or | |
3999 | * invalidated (changing page->mapping to NULL), or even | |
4000 | * swizzled back from swapper_space to tmpfs file | |
4001 | * mapping | |
4002 | */ | |
c8f2f24b JB |
4003 | if (!trylock_page(page)) { |
4004 | flush_fn(data); | |
4005 | lock_page(page); | |
01d658f2 | 4006 | } |
d1310b2e CM |
4007 | |
4008 | if (unlikely(page->mapping != mapping)) { | |
4009 | unlock_page(page); | |
4010 | continue; | |
4011 | } | |
4012 | ||
4013 | if (!wbc->range_cyclic && page->index > end) { | |
4014 | done = 1; | |
4015 | unlock_page(page); | |
4016 | continue; | |
4017 | } | |
4018 | ||
d2c3f4f6 | 4019 | if (wbc->sync_mode != WB_SYNC_NONE) { |
0e6bd956 CM |
4020 | if (PageWriteback(page)) |
4021 | flush_fn(data); | |
d1310b2e | 4022 | wait_on_page_writeback(page); |
d2c3f4f6 | 4023 | } |
d1310b2e CM |
4024 | |
4025 | if (PageWriteback(page) || | |
4026 | !clear_page_dirty_for_io(page)) { | |
4027 | unlock_page(page); | |
4028 | continue; | |
4029 | } | |
4030 | ||
4031 | ret = (*writepage)(page, wbc, data); | |
4032 | ||
4033 | if (unlikely(ret == AOP_WRITEPAGE_ACTIVATE)) { | |
4034 | unlock_page(page); | |
4035 | ret = 0; | |
4036 | } | |
a9132667 LB |
4037 | if (ret < 0) { |
4038 | /* | |
4039 | * done_index is set past this page, | |
4040 | * so media errors will not choke | |
4041 | * background writeout for the entire | |
4042 | * file. This has consequences for | |
4043 | * range_cyclic semantics (ie. it may | |
4044 | * not be suitable for data integrity | |
4045 | * writeout). | |
4046 | */ | |
4047 | done_index = page->index + 1; | |
4048 | done = 1; | |
4049 | break; | |
4050 | } | |
f85d7d6c CM |
4051 | |
4052 | /* | |
4053 | * the filesystem may choose to bump up nr_to_write. | |
4054 | * We have to make sure to honor the new nr_to_write | |
4055 | * at any time | |
4056 | */ | |
4057 | nr_to_write_done = wbc->nr_to_write <= 0; | |
d1310b2e CM |
4058 | } |
4059 | pagevec_release(&pvec); | |
4060 | cond_resched(); | |
4061 | } | |
894b36e3 | 4062 | if (!scanned && !done) { |
d1310b2e CM |
4063 | /* |
4064 | * We hit the last page and there is more work to be done: wrap | |
4065 | * back to the start of the file | |
4066 | */ | |
4067 | scanned = 1; | |
4068 | index = 0; | |
4069 | goto retry; | |
4070 | } | |
a9132667 LB |
4071 | |
4072 | if (wbc->range_cyclic || (wbc->nr_to_write > 0 && range_whole)) | |
4073 | mapping->writeback_index = done_index; | |
4074 | ||
7fd1a3f7 | 4075 | btrfs_add_delayed_iput(inode); |
894b36e3 | 4076 | return ret; |
d1310b2e | 4077 | } |
d1310b2e | 4078 | |
ffbd517d | 4079 | static void flush_epd_write_bio(struct extent_page_data *epd) |
d2c3f4f6 | 4080 | { |
d2c3f4f6 | 4081 | if (epd->bio) { |
355808c2 JM |
4082 | int ret; |
4083 | ||
1f7ad75b | 4084 | bio_set_op_attrs(epd->bio, REQ_OP_WRITE, |
70fd7614 | 4085 | epd->sync_io ? REQ_SYNC : 0); |
355808c2 | 4086 | |
1f7ad75b | 4087 | ret = submit_one_bio(epd->bio, 0, epd->bio_flags); |
79787eaa | 4088 | BUG_ON(ret < 0); /* -ENOMEM */ |
d2c3f4f6 CM |
4089 | epd->bio = NULL; |
4090 | } | |
4091 | } | |
4092 | ||
ffbd517d CM |
4093 | static noinline void flush_write_bio(void *data) |
4094 | { | |
4095 | struct extent_page_data *epd = data; | |
4096 | flush_epd_write_bio(epd); | |
4097 | } | |
4098 | ||
d1310b2e CM |
4099 | int extent_write_full_page(struct extent_io_tree *tree, struct page *page, |
4100 | get_extent_t *get_extent, | |
4101 | struct writeback_control *wbc) | |
4102 | { | |
4103 | int ret; | |
d1310b2e CM |
4104 | struct extent_page_data epd = { |
4105 | .bio = NULL, | |
4106 | .tree = tree, | |
4107 | .get_extent = get_extent, | |
771ed689 | 4108 | .extent_locked = 0, |
ffbd517d | 4109 | .sync_io = wbc->sync_mode == WB_SYNC_ALL, |
de0022b9 | 4110 | .bio_flags = 0, |
d1310b2e | 4111 | }; |
d1310b2e | 4112 | |
d1310b2e CM |
4113 | ret = __extent_writepage(page, wbc, &epd); |
4114 | ||
ffbd517d | 4115 | flush_epd_write_bio(&epd); |
d1310b2e CM |
4116 | return ret; |
4117 | } | |
d1310b2e | 4118 | |
771ed689 CM |
4119 | int extent_write_locked_range(struct extent_io_tree *tree, struct inode *inode, |
4120 | u64 start, u64 end, get_extent_t *get_extent, | |
4121 | int mode) | |
4122 | { | |
4123 | int ret = 0; | |
4124 | struct address_space *mapping = inode->i_mapping; | |
4125 | struct page *page; | |
09cbfeaf KS |
4126 | unsigned long nr_pages = (end - start + PAGE_SIZE) >> |
4127 | PAGE_SHIFT; | |
771ed689 CM |
4128 | |
4129 | struct extent_page_data epd = { | |
4130 | .bio = NULL, | |
4131 | .tree = tree, | |
4132 | .get_extent = get_extent, | |
4133 | .extent_locked = 1, | |
ffbd517d | 4134 | .sync_io = mode == WB_SYNC_ALL, |
de0022b9 | 4135 | .bio_flags = 0, |
771ed689 CM |
4136 | }; |
4137 | struct writeback_control wbc_writepages = { | |
771ed689 | 4138 | .sync_mode = mode, |
771ed689 CM |
4139 | .nr_to_write = nr_pages * 2, |
4140 | .range_start = start, | |
4141 | .range_end = end + 1, | |
4142 | }; | |
4143 | ||
d397712b | 4144 | while (start <= end) { |
09cbfeaf | 4145 | page = find_get_page(mapping, start >> PAGE_SHIFT); |
771ed689 CM |
4146 | if (clear_page_dirty_for_io(page)) |
4147 | ret = __extent_writepage(page, &wbc_writepages, &epd); | |
4148 | else { | |
4149 | if (tree->ops && tree->ops->writepage_end_io_hook) | |
4150 | tree->ops->writepage_end_io_hook(page, start, | |
09cbfeaf | 4151 | start + PAGE_SIZE - 1, |
771ed689 CM |
4152 | NULL, 1); |
4153 | unlock_page(page); | |
4154 | } | |
09cbfeaf KS |
4155 | put_page(page); |
4156 | start += PAGE_SIZE; | |
771ed689 CM |
4157 | } |
4158 | ||
ffbd517d | 4159 | flush_epd_write_bio(&epd); |
771ed689 CM |
4160 | return ret; |
4161 | } | |
d1310b2e CM |
4162 | |
4163 | int extent_writepages(struct extent_io_tree *tree, | |
4164 | struct address_space *mapping, | |
4165 | get_extent_t *get_extent, | |
4166 | struct writeback_control *wbc) | |
4167 | { | |
4168 | int ret = 0; | |
4169 | struct extent_page_data epd = { | |
4170 | .bio = NULL, | |
4171 | .tree = tree, | |
4172 | .get_extent = get_extent, | |
771ed689 | 4173 | .extent_locked = 0, |
ffbd517d | 4174 | .sync_io = wbc->sync_mode == WB_SYNC_ALL, |
de0022b9 | 4175 | .bio_flags = 0, |
d1310b2e CM |
4176 | }; |
4177 | ||
4242b64a | 4178 | ret = extent_write_cache_pages(mapping, wbc, __extent_writepage, &epd, |
d2c3f4f6 | 4179 | flush_write_bio); |
ffbd517d | 4180 | flush_epd_write_bio(&epd); |
d1310b2e CM |
4181 | return ret; |
4182 | } | |
d1310b2e CM |
4183 | |
4184 | int extent_readpages(struct extent_io_tree *tree, | |
4185 | struct address_space *mapping, | |
4186 | struct list_head *pages, unsigned nr_pages, | |
4187 | get_extent_t get_extent) | |
4188 | { | |
4189 | struct bio *bio = NULL; | |
4190 | unsigned page_idx; | |
c8b97818 | 4191 | unsigned long bio_flags = 0; |
67c9684f LB |
4192 | struct page *pagepool[16]; |
4193 | struct page *page; | |
125bac01 | 4194 | struct extent_map *em_cached = NULL; |
67c9684f | 4195 | int nr = 0; |
808f80b4 | 4196 | u64 prev_em_start = (u64)-1; |
d1310b2e | 4197 | |
d1310b2e | 4198 | for (page_idx = 0; page_idx < nr_pages; page_idx++) { |
67c9684f | 4199 | page = list_entry(pages->prev, struct page, lru); |
d1310b2e CM |
4200 | |
4201 | prefetchw(&page->flags); | |
4202 | list_del(&page->lru); | |
67c9684f | 4203 | if (add_to_page_cache_lru(page, mapping, |
8a5c743e MH |
4204 | page->index, |
4205 | readahead_gfp_mask(mapping))) { | |
09cbfeaf | 4206 | put_page(page); |
67c9684f | 4207 | continue; |
d1310b2e | 4208 | } |
67c9684f LB |
4209 | |
4210 | pagepool[nr++] = page; | |
4211 | if (nr < ARRAY_SIZE(pagepool)) | |
4212 | continue; | |
125bac01 | 4213 | __extent_readpages(tree, pagepool, nr, get_extent, &em_cached, |
1f7ad75b | 4214 | &bio, 0, &bio_flags, &prev_em_start); |
67c9684f | 4215 | nr = 0; |
d1310b2e | 4216 | } |
9974090b | 4217 | if (nr) |
125bac01 | 4218 | __extent_readpages(tree, pagepool, nr, get_extent, &em_cached, |
1f7ad75b | 4219 | &bio, 0, &bio_flags, &prev_em_start); |
67c9684f | 4220 | |
125bac01 MX |
4221 | if (em_cached) |
4222 | free_extent_map(em_cached); | |
4223 | ||
d1310b2e CM |
4224 | BUG_ON(!list_empty(pages)); |
4225 | if (bio) | |
1f7ad75b | 4226 | return submit_one_bio(bio, 0, bio_flags); |
d1310b2e CM |
4227 | return 0; |
4228 | } | |
d1310b2e CM |
4229 | |
4230 | /* | |
4231 | * basic invalidatepage code, this waits on any locked or writeback | |
4232 | * ranges corresponding to the page, and then deletes any extent state | |
4233 | * records from the tree | |
4234 | */ | |
4235 | int extent_invalidatepage(struct extent_io_tree *tree, | |
4236 | struct page *page, unsigned long offset) | |
4237 | { | |
2ac55d41 | 4238 | struct extent_state *cached_state = NULL; |
4eee4fa4 | 4239 | u64 start = page_offset(page); |
09cbfeaf | 4240 | u64 end = start + PAGE_SIZE - 1; |
d1310b2e CM |
4241 | size_t blocksize = page->mapping->host->i_sb->s_blocksize; |
4242 | ||
fda2832f | 4243 | start += ALIGN(offset, blocksize); |
d1310b2e CM |
4244 | if (start > end) |
4245 | return 0; | |
4246 | ||
ff13db41 | 4247 | lock_extent_bits(tree, start, end, &cached_state); |
1edbb734 | 4248 | wait_on_page_writeback(page); |
d1310b2e | 4249 | clear_extent_bit(tree, start, end, |
32c00aff JB |
4250 | EXTENT_LOCKED | EXTENT_DIRTY | EXTENT_DELALLOC | |
4251 | EXTENT_DO_ACCOUNTING, | |
2ac55d41 | 4252 | 1, 1, &cached_state, GFP_NOFS); |
d1310b2e CM |
4253 | return 0; |
4254 | } | |
d1310b2e | 4255 | |
7b13b7b1 CM |
4256 | /* |
4257 | * a helper for releasepage, this tests for areas of the page that | |
4258 | * are locked or under IO and drops the related state bits if it is safe | |
4259 | * to drop the page. | |
4260 | */ | |
48a3b636 ES |
4261 | static int try_release_extent_state(struct extent_map_tree *map, |
4262 | struct extent_io_tree *tree, | |
4263 | struct page *page, gfp_t mask) | |
7b13b7b1 | 4264 | { |
4eee4fa4 | 4265 | u64 start = page_offset(page); |
09cbfeaf | 4266 | u64 end = start + PAGE_SIZE - 1; |
7b13b7b1 CM |
4267 | int ret = 1; |
4268 | ||
211f90e6 | 4269 | if (test_range_bit(tree, start, end, |
8b62b72b | 4270 | EXTENT_IOBITS, 0, NULL)) |
7b13b7b1 CM |
4271 | ret = 0; |
4272 | else { | |
11ef160f CM |
4273 | /* |
4274 | * at this point we can safely clear everything except the | |
4275 | * locked bit and the nodatasum bit | |
4276 | */ | |
e3f24cc5 | 4277 | ret = clear_extent_bit(tree, start, end, |
11ef160f CM |
4278 | ~(EXTENT_LOCKED | EXTENT_NODATASUM), |
4279 | 0, 0, NULL, mask); | |
e3f24cc5 CM |
4280 | |
4281 | /* if clear_extent_bit failed for enomem reasons, | |
4282 | * we can't allow the release to continue. | |
4283 | */ | |
4284 | if (ret < 0) | |
4285 | ret = 0; | |
4286 | else | |
4287 | ret = 1; | |
7b13b7b1 CM |
4288 | } |
4289 | return ret; | |
4290 | } | |
7b13b7b1 | 4291 | |
d1310b2e CM |
4292 | /* |
4293 | * a helper for releasepage. As long as there are no locked extents | |
4294 | * in the range corresponding to the page, both state records and extent | |
4295 | * map records are removed | |
4296 | */ | |
4297 | int try_release_extent_mapping(struct extent_map_tree *map, | |
70dec807 CM |
4298 | struct extent_io_tree *tree, struct page *page, |
4299 | gfp_t mask) | |
d1310b2e CM |
4300 | { |
4301 | struct extent_map *em; | |
4eee4fa4 | 4302 | u64 start = page_offset(page); |
09cbfeaf | 4303 | u64 end = start + PAGE_SIZE - 1; |
7b13b7b1 | 4304 | |
d0164adc | 4305 | if (gfpflags_allow_blocking(mask) && |
ee22184b | 4306 | page->mapping->host->i_size > SZ_16M) { |
39b5637f | 4307 | u64 len; |
70dec807 | 4308 | while (start <= end) { |
39b5637f | 4309 | len = end - start + 1; |
890871be | 4310 | write_lock(&map->lock); |
39b5637f | 4311 | em = lookup_extent_mapping(map, start, len); |
285190d9 | 4312 | if (!em) { |
890871be | 4313 | write_unlock(&map->lock); |
70dec807 CM |
4314 | break; |
4315 | } | |
7f3c74fb CM |
4316 | if (test_bit(EXTENT_FLAG_PINNED, &em->flags) || |
4317 | em->start != start) { | |
890871be | 4318 | write_unlock(&map->lock); |
70dec807 CM |
4319 | free_extent_map(em); |
4320 | break; | |
4321 | } | |
4322 | if (!test_range_bit(tree, em->start, | |
4323 | extent_map_end(em) - 1, | |
8b62b72b | 4324 | EXTENT_LOCKED | EXTENT_WRITEBACK, |
9655d298 | 4325 | 0, NULL)) { |
70dec807 CM |
4326 | remove_extent_mapping(map, em); |
4327 | /* once for the rb tree */ | |
4328 | free_extent_map(em); | |
4329 | } | |
4330 | start = extent_map_end(em); | |
890871be | 4331 | write_unlock(&map->lock); |
70dec807 CM |
4332 | |
4333 | /* once for us */ | |
d1310b2e CM |
4334 | free_extent_map(em); |
4335 | } | |
d1310b2e | 4336 | } |
7b13b7b1 | 4337 | return try_release_extent_state(map, tree, page, mask); |
d1310b2e | 4338 | } |
d1310b2e | 4339 | |
ec29ed5b CM |
4340 | /* |
4341 | * helper function for fiemap, which doesn't want to see any holes. | |
4342 | * This maps until we find something past 'last' | |
4343 | */ | |
4344 | static struct extent_map *get_extent_skip_holes(struct inode *inode, | |
4345 | u64 offset, | |
4346 | u64 last, | |
4347 | get_extent_t *get_extent) | |
4348 | { | |
da17066c | 4349 | u64 sectorsize = btrfs_inode_sectorsize(inode); |
ec29ed5b CM |
4350 | struct extent_map *em; |
4351 | u64 len; | |
4352 | ||
4353 | if (offset >= last) | |
4354 | return NULL; | |
4355 | ||
67871254 | 4356 | while (1) { |
ec29ed5b CM |
4357 | len = last - offset; |
4358 | if (len == 0) | |
4359 | break; | |
fda2832f | 4360 | len = ALIGN(len, sectorsize); |
fc4f21b1 | 4361 | em = get_extent(BTRFS_I(inode), NULL, 0, offset, len, 0); |
c704005d | 4362 | if (IS_ERR_OR_NULL(em)) |
ec29ed5b CM |
4363 | return em; |
4364 | ||
4365 | /* if this isn't a hole return it */ | |
4366 | if (!test_bit(EXTENT_FLAG_VACANCY, &em->flags) && | |
4367 | em->block_start != EXTENT_MAP_HOLE) { | |
4368 | return em; | |
4369 | } | |
4370 | ||
4371 | /* this is a hole, advance to the next extent */ | |
4372 | offset = extent_map_end(em); | |
4373 | free_extent_map(em); | |
4374 | if (offset >= last) | |
4375 | break; | |
4376 | } | |
4377 | return NULL; | |
4378 | } | |
4379 | ||
4751832d QW |
4380 | /* |
4381 | * To cache previous fiemap extent | |
4382 | * | |
4383 | * Will be used for merging fiemap extent | |
4384 | */ | |
4385 | struct fiemap_cache { | |
4386 | u64 offset; | |
4387 | u64 phys; | |
4388 | u64 len; | |
4389 | u32 flags; | |
4390 | bool cached; | |
4391 | }; | |
4392 | ||
4393 | /* | |
4394 | * Helper to submit fiemap extent. | |
4395 | * | |
4396 | * Will try to merge current fiemap extent specified by @offset, @phys, | |
4397 | * @len and @flags with cached one. | |
4398 | * And only when we fails to merge, cached one will be submitted as | |
4399 | * fiemap extent. | |
4400 | * | |
4401 | * Return value is the same as fiemap_fill_next_extent(). | |
4402 | */ | |
4403 | static int emit_fiemap_extent(struct fiemap_extent_info *fieinfo, | |
4404 | struct fiemap_cache *cache, | |
4405 | u64 offset, u64 phys, u64 len, u32 flags) | |
4406 | { | |
4407 | int ret = 0; | |
4408 | ||
4409 | if (!cache->cached) | |
4410 | goto assign; | |
4411 | ||
4412 | /* | |
4413 | * Sanity check, extent_fiemap() should have ensured that new | |
4414 | * fiemap extent won't overlap with cahced one. | |
4415 | * Not recoverable. | |
4416 | * | |
4417 | * NOTE: Physical address can overlap, due to compression | |
4418 | */ | |
4419 | if (cache->offset + cache->len > offset) { | |
4420 | WARN_ON(1); | |
4421 | return -EINVAL; | |
4422 | } | |
4423 | ||
4424 | /* | |
4425 | * Only merges fiemap extents if | |
4426 | * 1) Their logical addresses are continuous | |
4427 | * | |
4428 | * 2) Their physical addresses are continuous | |
4429 | * So truly compressed (physical size smaller than logical size) | |
4430 | * extents won't get merged with each other | |
4431 | * | |
4432 | * 3) Share same flags except FIEMAP_EXTENT_LAST | |
4433 | * So regular extent won't get merged with prealloc extent | |
4434 | */ | |
4435 | if (cache->offset + cache->len == offset && | |
4436 | cache->phys + cache->len == phys && | |
4437 | (cache->flags & ~FIEMAP_EXTENT_LAST) == | |
4438 | (flags & ~FIEMAP_EXTENT_LAST)) { | |
4439 | cache->len += len; | |
4440 | cache->flags |= flags; | |
4441 | goto try_submit_last; | |
4442 | } | |
4443 | ||
4444 | /* Not mergeable, need to submit cached one */ | |
4445 | ret = fiemap_fill_next_extent(fieinfo, cache->offset, cache->phys, | |
4446 | cache->len, cache->flags); | |
4447 | cache->cached = false; | |
4448 | if (ret) | |
4449 | return ret; | |
4450 | assign: | |
4451 | cache->cached = true; | |
4452 | cache->offset = offset; | |
4453 | cache->phys = phys; | |
4454 | cache->len = len; | |
4455 | cache->flags = flags; | |
4456 | try_submit_last: | |
4457 | if (cache->flags & FIEMAP_EXTENT_LAST) { | |
4458 | ret = fiemap_fill_next_extent(fieinfo, cache->offset, | |
4459 | cache->phys, cache->len, cache->flags); | |
4460 | cache->cached = false; | |
4461 | } | |
4462 | return ret; | |
4463 | } | |
4464 | ||
4465 | /* | |
4466 | * Sanity check for fiemap cache | |
4467 | * | |
4468 | * All fiemap cache should be submitted by emit_fiemap_extent() | |
4469 | * Iteration should be terminated either by last fiemap extent or | |
4470 | * fieinfo->fi_extents_max. | |
4471 | * So no cached fiemap should exist. | |
4472 | */ | |
4473 | static int check_fiemap_cache(struct btrfs_fs_info *fs_info, | |
4474 | struct fiemap_extent_info *fieinfo, | |
4475 | struct fiemap_cache *cache) | |
4476 | { | |
4477 | int ret; | |
4478 | ||
4479 | if (!cache->cached) | |
4480 | return 0; | |
4481 | ||
4482 | /* Small and recoverbale problem, only to info developer */ | |
4483 | #ifdef CONFIG_BTRFS_DEBUG | |
4484 | WARN_ON(1); | |
4485 | #endif | |
4486 | btrfs_warn(fs_info, | |
4487 | "unhandled fiemap cache detected: offset=%llu phys=%llu len=%llu flags=0x%x", | |
4488 | cache->offset, cache->phys, cache->len, cache->flags); | |
4489 | ret = fiemap_fill_next_extent(fieinfo, cache->offset, cache->phys, | |
4490 | cache->len, cache->flags); | |
4491 | cache->cached = false; | |
4492 | if (ret > 0) | |
4493 | ret = 0; | |
4494 | return ret; | |
4495 | } | |
4496 | ||
1506fcc8 YS |
4497 | int extent_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, |
4498 | __u64 start, __u64 len, get_extent_t *get_extent) | |
4499 | { | |
975f84fe | 4500 | int ret = 0; |
1506fcc8 YS |
4501 | u64 off = start; |
4502 | u64 max = start + len; | |
4503 | u32 flags = 0; | |
975f84fe JB |
4504 | u32 found_type; |
4505 | u64 last; | |
ec29ed5b | 4506 | u64 last_for_get_extent = 0; |
1506fcc8 | 4507 | u64 disko = 0; |
ec29ed5b | 4508 | u64 isize = i_size_read(inode); |
975f84fe | 4509 | struct btrfs_key found_key; |
1506fcc8 | 4510 | struct extent_map *em = NULL; |
2ac55d41 | 4511 | struct extent_state *cached_state = NULL; |
975f84fe | 4512 | struct btrfs_path *path; |
dc046b10 | 4513 | struct btrfs_root *root = BTRFS_I(inode)->root; |
4751832d | 4514 | struct fiemap_cache cache = { 0 }; |
1506fcc8 | 4515 | int end = 0; |
ec29ed5b CM |
4516 | u64 em_start = 0; |
4517 | u64 em_len = 0; | |
4518 | u64 em_end = 0; | |
1506fcc8 YS |
4519 | |
4520 | if (len == 0) | |
4521 | return -EINVAL; | |
4522 | ||
975f84fe JB |
4523 | path = btrfs_alloc_path(); |
4524 | if (!path) | |
4525 | return -ENOMEM; | |
4526 | path->leave_spinning = 1; | |
4527 | ||
da17066c JM |
4528 | start = round_down(start, btrfs_inode_sectorsize(inode)); |
4529 | len = round_up(max, btrfs_inode_sectorsize(inode)) - start; | |
4d479cf0 | 4530 | |
ec29ed5b CM |
4531 | /* |
4532 | * lookup the last file extent. We're not using i_size here | |
4533 | * because there might be preallocation past i_size | |
4534 | */ | |
f85b7379 DS |
4535 | ret = btrfs_lookup_file_extent(NULL, root, path, |
4536 | btrfs_ino(BTRFS_I(inode)), -1, 0); | |
975f84fe JB |
4537 | if (ret < 0) { |
4538 | btrfs_free_path(path); | |
4539 | return ret; | |
2d324f59 LB |
4540 | } else { |
4541 | WARN_ON(!ret); | |
4542 | if (ret == 1) | |
4543 | ret = 0; | |
975f84fe | 4544 | } |
2d324f59 | 4545 | |
975f84fe | 4546 | path->slots[0]--; |
975f84fe | 4547 | btrfs_item_key_to_cpu(path->nodes[0], &found_key, path->slots[0]); |
962a298f | 4548 | found_type = found_key.type; |
975f84fe | 4549 | |
ec29ed5b | 4550 | /* No extents, but there might be delalloc bits */ |
4a0cc7ca | 4551 | if (found_key.objectid != btrfs_ino(BTRFS_I(inode)) || |
975f84fe | 4552 | found_type != BTRFS_EXTENT_DATA_KEY) { |
ec29ed5b CM |
4553 | /* have to trust i_size as the end */ |
4554 | last = (u64)-1; | |
4555 | last_for_get_extent = isize; | |
4556 | } else { | |
4557 | /* | |
4558 | * remember the start of the last extent. There are a | |
4559 | * bunch of different factors that go into the length of the | |
4560 | * extent, so its much less complex to remember where it started | |
4561 | */ | |
4562 | last = found_key.offset; | |
4563 | last_for_get_extent = last + 1; | |
975f84fe | 4564 | } |
fe09e16c | 4565 | btrfs_release_path(path); |
975f84fe | 4566 | |
ec29ed5b CM |
4567 | /* |
4568 | * we might have some extents allocated but more delalloc past those | |
4569 | * extents. so, we trust isize unless the start of the last extent is | |
4570 | * beyond isize | |
4571 | */ | |
4572 | if (last < isize) { | |
4573 | last = (u64)-1; | |
4574 | last_for_get_extent = isize; | |
4575 | } | |
4576 | ||
ff13db41 | 4577 | lock_extent_bits(&BTRFS_I(inode)->io_tree, start, start + len - 1, |
d0082371 | 4578 | &cached_state); |
ec29ed5b | 4579 | |
4d479cf0 | 4580 | em = get_extent_skip_holes(inode, start, last_for_get_extent, |
ec29ed5b | 4581 | get_extent); |
1506fcc8 YS |
4582 | if (!em) |
4583 | goto out; | |
4584 | if (IS_ERR(em)) { | |
4585 | ret = PTR_ERR(em); | |
4586 | goto out; | |
4587 | } | |
975f84fe | 4588 | |
1506fcc8 | 4589 | while (!end) { |
b76bb701 | 4590 | u64 offset_in_extent = 0; |
ea8efc74 CM |
4591 | |
4592 | /* break if the extent we found is outside the range */ | |
4593 | if (em->start >= max || extent_map_end(em) < off) | |
4594 | break; | |
4595 | ||
4596 | /* | |
4597 | * get_extent may return an extent that starts before our | |
4598 | * requested range. We have to make sure the ranges | |
4599 | * we return to fiemap always move forward and don't | |
4600 | * overlap, so adjust the offsets here | |
4601 | */ | |
4602 | em_start = max(em->start, off); | |
1506fcc8 | 4603 | |
ea8efc74 CM |
4604 | /* |
4605 | * record the offset from the start of the extent | |
b76bb701 JB |
4606 | * for adjusting the disk offset below. Only do this if the |
4607 | * extent isn't compressed since our in ram offset may be past | |
4608 | * what we have actually allocated on disk. | |
ea8efc74 | 4609 | */ |
b76bb701 JB |
4610 | if (!test_bit(EXTENT_FLAG_COMPRESSED, &em->flags)) |
4611 | offset_in_extent = em_start - em->start; | |
ec29ed5b | 4612 | em_end = extent_map_end(em); |
ea8efc74 | 4613 | em_len = em_end - em_start; |
1506fcc8 YS |
4614 | disko = 0; |
4615 | flags = 0; | |
4616 | ||
ea8efc74 CM |
4617 | /* |
4618 | * bump off for our next call to get_extent | |
4619 | */ | |
4620 | off = extent_map_end(em); | |
4621 | if (off >= max) | |
4622 | end = 1; | |
4623 | ||
93dbfad7 | 4624 | if (em->block_start == EXTENT_MAP_LAST_BYTE) { |
1506fcc8 YS |
4625 | end = 1; |
4626 | flags |= FIEMAP_EXTENT_LAST; | |
93dbfad7 | 4627 | } else if (em->block_start == EXTENT_MAP_INLINE) { |
1506fcc8 YS |
4628 | flags |= (FIEMAP_EXTENT_DATA_INLINE | |
4629 | FIEMAP_EXTENT_NOT_ALIGNED); | |
93dbfad7 | 4630 | } else if (em->block_start == EXTENT_MAP_DELALLOC) { |
1506fcc8 YS |
4631 | flags |= (FIEMAP_EXTENT_DELALLOC | |
4632 | FIEMAP_EXTENT_UNKNOWN); | |
dc046b10 | 4633 | } else if (fieinfo->fi_extents_max) { |
afce772e LF |
4634 | struct btrfs_trans_handle *trans; |
4635 | ||
dc046b10 JB |
4636 | u64 bytenr = em->block_start - |
4637 | (em->start - em->orig_start); | |
fe09e16c | 4638 | |
ea8efc74 | 4639 | disko = em->block_start + offset_in_extent; |
fe09e16c | 4640 | |
afce772e LF |
4641 | /* |
4642 | * We need a trans handle to get delayed refs | |
4643 | */ | |
4644 | trans = btrfs_join_transaction(root); | |
4645 | /* | |
4646 | * It's OK if we can't start a trans we can still check | |
4647 | * from commit_root | |
4648 | */ | |
4649 | if (IS_ERR(trans)) | |
4650 | trans = NULL; | |
4651 | ||
fe09e16c LB |
4652 | /* |
4653 | * As btrfs supports shared space, this information | |
4654 | * can be exported to userspace tools via | |
dc046b10 JB |
4655 | * flag FIEMAP_EXTENT_SHARED. If fi_extents_max == 0 |
4656 | * then we're just getting a count and we can skip the | |
4657 | * lookup stuff. | |
fe09e16c | 4658 | */ |
afce772e | 4659 | ret = btrfs_check_shared(trans, root->fs_info, |
f85b7379 DS |
4660 | root->objectid, |
4661 | btrfs_ino(BTRFS_I(inode)), bytenr); | |
afce772e | 4662 | if (trans) |
3a45bb20 | 4663 | btrfs_end_transaction(trans); |
dc046b10 | 4664 | if (ret < 0) |
fe09e16c | 4665 | goto out_free; |
dc046b10 | 4666 | if (ret) |
fe09e16c | 4667 | flags |= FIEMAP_EXTENT_SHARED; |
dc046b10 | 4668 | ret = 0; |
1506fcc8 YS |
4669 | } |
4670 | if (test_bit(EXTENT_FLAG_COMPRESSED, &em->flags)) | |
4671 | flags |= FIEMAP_EXTENT_ENCODED; | |
0d2b2372 JB |
4672 | if (test_bit(EXTENT_FLAG_PREALLOC, &em->flags)) |
4673 | flags |= FIEMAP_EXTENT_UNWRITTEN; | |
1506fcc8 | 4674 | |
1506fcc8 YS |
4675 | free_extent_map(em); |
4676 | em = NULL; | |
ec29ed5b CM |
4677 | if ((em_start >= last) || em_len == (u64)-1 || |
4678 | (last == (u64)-1 && isize <= em_end)) { | |
1506fcc8 YS |
4679 | flags |= FIEMAP_EXTENT_LAST; |
4680 | end = 1; | |
4681 | } | |
4682 | ||
ec29ed5b CM |
4683 | /* now scan forward to see if this is really the last extent. */ |
4684 | em = get_extent_skip_holes(inode, off, last_for_get_extent, | |
4685 | get_extent); | |
4686 | if (IS_ERR(em)) { | |
4687 | ret = PTR_ERR(em); | |
4688 | goto out; | |
4689 | } | |
4690 | if (!em) { | |
975f84fe JB |
4691 | flags |= FIEMAP_EXTENT_LAST; |
4692 | end = 1; | |
4693 | } | |
4751832d QW |
4694 | ret = emit_fiemap_extent(fieinfo, &cache, em_start, disko, |
4695 | em_len, flags); | |
26e726af CS |
4696 | if (ret) { |
4697 | if (ret == 1) | |
4698 | ret = 0; | |
ec29ed5b | 4699 | goto out_free; |
26e726af | 4700 | } |
1506fcc8 YS |
4701 | } |
4702 | out_free: | |
4751832d QW |
4703 | if (!ret) |
4704 | ret = check_fiemap_cache(root->fs_info, fieinfo, &cache); | |
1506fcc8 YS |
4705 | free_extent_map(em); |
4706 | out: | |
fe09e16c | 4707 | btrfs_free_path(path); |
a52f4cd2 | 4708 | unlock_extent_cached(&BTRFS_I(inode)->io_tree, start, start + len - 1, |
2ac55d41 | 4709 | &cached_state, GFP_NOFS); |
1506fcc8 YS |
4710 | return ret; |
4711 | } | |
4712 | ||
727011e0 CM |
4713 | static void __free_extent_buffer(struct extent_buffer *eb) |
4714 | { | |
6d49ba1b | 4715 | btrfs_leak_debug_del(&eb->leak_list); |
727011e0 CM |
4716 | kmem_cache_free(extent_buffer_cache, eb); |
4717 | } | |
4718 | ||
a26e8c9f | 4719 | int extent_buffer_under_io(struct extent_buffer *eb) |
db7f3436 JB |
4720 | { |
4721 | return (atomic_read(&eb->io_pages) || | |
4722 | test_bit(EXTENT_BUFFER_WRITEBACK, &eb->bflags) || | |
4723 | test_bit(EXTENT_BUFFER_DIRTY, &eb->bflags)); | |
4724 | } | |
4725 | ||
4726 | /* | |
4727 | * Helper for releasing extent buffer page. | |
4728 | */ | |
a50924e3 | 4729 | static void btrfs_release_extent_buffer_page(struct extent_buffer *eb) |
db7f3436 JB |
4730 | { |
4731 | unsigned long index; | |
db7f3436 JB |
4732 | struct page *page; |
4733 | int mapped = !test_bit(EXTENT_BUFFER_DUMMY, &eb->bflags); | |
4734 | ||
4735 | BUG_ON(extent_buffer_under_io(eb)); | |
4736 | ||
a50924e3 DS |
4737 | index = num_extent_pages(eb->start, eb->len); |
4738 | if (index == 0) | |
db7f3436 JB |
4739 | return; |
4740 | ||
4741 | do { | |
4742 | index--; | |
fb85fc9a | 4743 | page = eb->pages[index]; |
5d2361db FL |
4744 | if (!page) |
4745 | continue; | |
4746 | if (mapped) | |
db7f3436 | 4747 | spin_lock(&page->mapping->private_lock); |
5d2361db FL |
4748 | /* |
4749 | * We do this since we'll remove the pages after we've | |
4750 | * removed the eb from the radix tree, so we could race | |
4751 | * and have this page now attached to the new eb. So | |
4752 | * only clear page_private if it's still connected to | |
4753 | * this eb. | |
4754 | */ | |
4755 | if (PagePrivate(page) && | |
4756 | page->private == (unsigned long)eb) { | |
4757 | BUG_ON(test_bit(EXTENT_BUFFER_DIRTY, &eb->bflags)); | |
4758 | BUG_ON(PageDirty(page)); | |
4759 | BUG_ON(PageWriteback(page)); | |
db7f3436 | 4760 | /* |
5d2361db FL |
4761 | * We need to make sure we haven't be attached |
4762 | * to a new eb. | |
db7f3436 | 4763 | */ |
5d2361db FL |
4764 | ClearPagePrivate(page); |
4765 | set_page_private(page, 0); | |
4766 | /* One for the page private */ | |
09cbfeaf | 4767 | put_page(page); |
db7f3436 | 4768 | } |
5d2361db FL |
4769 | |
4770 | if (mapped) | |
4771 | spin_unlock(&page->mapping->private_lock); | |
4772 | ||
01327610 | 4773 | /* One for when we allocated the page */ |
09cbfeaf | 4774 | put_page(page); |
a50924e3 | 4775 | } while (index != 0); |
db7f3436 JB |
4776 | } |
4777 | ||
4778 | /* | |
4779 | * Helper for releasing the extent buffer. | |
4780 | */ | |
4781 | static inline void btrfs_release_extent_buffer(struct extent_buffer *eb) | |
4782 | { | |
a50924e3 | 4783 | btrfs_release_extent_buffer_page(eb); |
db7f3436 JB |
4784 | __free_extent_buffer(eb); |
4785 | } | |
4786 | ||
f28491e0 JB |
4787 | static struct extent_buffer * |
4788 | __alloc_extent_buffer(struct btrfs_fs_info *fs_info, u64 start, | |
23d79d81 | 4789 | unsigned long len) |
d1310b2e CM |
4790 | { |
4791 | struct extent_buffer *eb = NULL; | |
4792 | ||
d1b5c567 | 4793 | eb = kmem_cache_zalloc(extent_buffer_cache, GFP_NOFS|__GFP_NOFAIL); |
d1310b2e CM |
4794 | eb->start = start; |
4795 | eb->len = len; | |
f28491e0 | 4796 | eb->fs_info = fs_info; |
815a51c7 | 4797 | eb->bflags = 0; |
bd681513 CM |
4798 | rwlock_init(&eb->lock); |
4799 | atomic_set(&eb->write_locks, 0); | |
4800 | atomic_set(&eb->read_locks, 0); | |
4801 | atomic_set(&eb->blocking_readers, 0); | |
4802 | atomic_set(&eb->blocking_writers, 0); | |
4803 | atomic_set(&eb->spinning_readers, 0); | |
4804 | atomic_set(&eb->spinning_writers, 0); | |
5b25f70f | 4805 | eb->lock_nested = 0; |
bd681513 CM |
4806 | init_waitqueue_head(&eb->write_lock_wq); |
4807 | init_waitqueue_head(&eb->read_lock_wq); | |
b4ce94de | 4808 | |
6d49ba1b ES |
4809 | btrfs_leak_debug_add(&eb->leak_list, &buffers); |
4810 | ||
3083ee2e | 4811 | spin_lock_init(&eb->refs_lock); |
d1310b2e | 4812 | atomic_set(&eb->refs, 1); |
0b32f4bb | 4813 | atomic_set(&eb->io_pages, 0); |
727011e0 | 4814 | |
b8dae313 DS |
4815 | /* |
4816 | * Sanity checks, currently the maximum is 64k covered by 16x 4k pages | |
4817 | */ | |
4818 | BUILD_BUG_ON(BTRFS_MAX_METADATA_BLOCKSIZE | |
4819 | > MAX_INLINE_EXTENT_BUFFER_SIZE); | |
4820 | BUG_ON(len > MAX_INLINE_EXTENT_BUFFER_SIZE); | |
d1310b2e CM |
4821 | |
4822 | return eb; | |
4823 | } | |
4824 | ||
815a51c7 JS |
4825 | struct extent_buffer *btrfs_clone_extent_buffer(struct extent_buffer *src) |
4826 | { | |
4827 | unsigned long i; | |
4828 | struct page *p; | |
4829 | struct extent_buffer *new; | |
4830 | unsigned long num_pages = num_extent_pages(src->start, src->len); | |
4831 | ||
3f556f78 | 4832 | new = __alloc_extent_buffer(src->fs_info, src->start, src->len); |
815a51c7 JS |
4833 | if (new == NULL) |
4834 | return NULL; | |
4835 | ||
4836 | for (i = 0; i < num_pages; i++) { | |
9ec72677 | 4837 | p = alloc_page(GFP_NOFS); |
db7f3436 JB |
4838 | if (!p) { |
4839 | btrfs_release_extent_buffer(new); | |
4840 | return NULL; | |
4841 | } | |
815a51c7 JS |
4842 | attach_extent_buffer_page(new, p); |
4843 | WARN_ON(PageDirty(p)); | |
4844 | SetPageUptodate(p); | |
4845 | new->pages[i] = p; | |
fba1acf9 | 4846 | copy_page(page_address(p), page_address(src->pages[i])); |
815a51c7 JS |
4847 | } |
4848 | ||
815a51c7 JS |
4849 | set_bit(EXTENT_BUFFER_UPTODATE, &new->bflags); |
4850 | set_bit(EXTENT_BUFFER_DUMMY, &new->bflags); | |
4851 | ||
4852 | return new; | |
4853 | } | |
4854 | ||
0f331229 OS |
4855 | struct extent_buffer *__alloc_dummy_extent_buffer(struct btrfs_fs_info *fs_info, |
4856 | u64 start, unsigned long len) | |
815a51c7 JS |
4857 | { |
4858 | struct extent_buffer *eb; | |
3f556f78 | 4859 | unsigned long num_pages; |
815a51c7 JS |
4860 | unsigned long i; |
4861 | ||
0f331229 | 4862 | num_pages = num_extent_pages(start, len); |
3f556f78 DS |
4863 | |
4864 | eb = __alloc_extent_buffer(fs_info, start, len); | |
815a51c7 JS |
4865 | if (!eb) |
4866 | return NULL; | |
4867 | ||
4868 | for (i = 0; i < num_pages; i++) { | |
9ec72677 | 4869 | eb->pages[i] = alloc_page(GFP_NOFS); |
815a51c7 JS |
4870 | if (!eb->pages[i]) |
4871 | goto err; | |
4872 | } | |
4873 | set_extent_buffer_uptodate(eb); | |
4874 | btrfs_set_header_nritems(eb, 0); | |
4875 | set_bit(EXTENT_BUFFER_DUMMY, &eb->bflags); | |
4876 | ||
4877 | return eb; | |
4878 | err: | |
84167d19 SB |
4879 | for (; i > 0; i--) |
4880 | __free_page(eb->pages[i - 1]); | |
815a51c7 JS |
4881 | __free_extent_buffer(eb); |
4882 | return NULL; | |
4883 | } | |
4884 | ||
0f331229 | 4885 | struct extent_buffer *alloc_dummy_extent_buffer(struct btrfs_fs_info *fs_info, |
da17066c | 4886 | u64 start) |
0f331229 | 4887 | { |
da17066c | 4888 | return __alloc_dummy_extent_buffer(fs_info, start, fs_info->nodesize); |
0f331229 OS |
4889 | } |
4890 | ||
0b32f4bb JB |
4891 | static void check_buffer_tree_ref(struct extent_buffer *eb) |
4892 | { | |
242e18c7 | 4893 | int refs; |
0b32f4bb JB |
4894 | /* the ref bit is tricky. We have to make sure it is set |
4895 | * if we have the buffer dirty. Otherwise the | |
4896 | * code to free a buffer can end up dropping a dirty | |
4897 | * page | |
4898 | * | |
4899 | * Once the ref bit is set, it won't go away while the | |
4900 | * buffer is dirty or in writeback, and it also won't | |
4901 | * go away while we have the reference count on the | |
4902 | * eb bumped. | |
4903 | * | |
4904 | * We can't just set the ref bit without bumping the | |
4905 | * ref on the eb because free_extent_buffer might | |
4906 | * see the ref bit and try to clear it. If this happens | |
4907 | * free_extent_buffer might end up dropping our original | |
4908 | * ref by mistake and freeing the page before we are able | |
4909 | * to add one more ref. | |
4910 | * | |
4911 | * So bump the ref count first, then set the bit. If someone | |
4912 | * beat us to it, drop the ref we added. | |
4913 | */ | |
242e18c7 CM |
4914 | refs = atomic_read(&eb->refs); |
4915 | if (refs >= 2 && test_bit(EXTENT_BUFFER_TREE_REF, &eb->bflags)) | |
4916 | return; | |
4917 | ||
594831c4 JB |
4918 | spin_lock(&eb->refs_lock); |
4919 | if (!test_and_set_bit(EXTENT_BUFFER_TREE_REF, &eb->bflags)) | |
0b32f4bb | 4920 | atomic_inc(&eb->refs); |
594831c4 | 4921 | spin_unlock(&eb->refs_lock); |
0b32f4bb JB |
4922 | } |
4923 | ||
2457aec6 MG |
4924 | static void mark_extent_buffer_accessed(struct extent_buffer *eb, |
4925 | struct page *accessed) | |
5df4235e JB |
4926 | { |
4927 | unsigned long num_pages, i; | |
4928 | ||
0b32f4bb JB |
4929 | check_buffer_tree_ref(eb); |
4930 | ||
5df4235e JB |
4931 | num_pages = num_extent_pages(eb->start, eb->len); |
4932 | for (i = 0; i < num_pages; i++) { | |
fb85fc9a DS |
4933 | struct page *p = eb->pages[i]; |
4934 | ||
2457aec6 MG |
4935 | if (p != accessed) |
4936 | mark_page_accessed(p); | |
5df4235e JB |
4937 | } |
4938 | } | |
4939 | ||
f28491e0 JB |
4940 | struct extent_buffer *find_extent_buffer(struct btrfs_fs_info *fs_info, |
4941 | u64 start) | |
452c75c3 CS |
4942 | { |
4943 | struct extent_buffer *eb; | |
4944 | ||
4945 | rcu_read_lock(); | |
f28491e0 | 4946 | eb = radix_tree_lookup(&fs_info->buffer_radix, |
09cbfeaf | 4947 | start >> PAGE_SHIFT); |
452c75c3 CS |
4948 | if (eb && atomic_inc_not_zero(&eb->refs)) { |
4949 | rcu_read_unlock(); | |
062c19e9 FM |
4950 | /* |
4951 | * Lock our eb's refs_lock to avoid races with | |
4952 | * free_extent_buffer. When we get our eb it might be flagged | |
4953 | * with EXTENT_BUFFER_STALE and another task running | |
4954 | * free_extent_buffer might have seen that flag set, | |
4955 | * eb->refs == 2, that the buffer isn't under IO (dirty and | |
4956 | * writeback flags not set) and it's still in the tree (flag | |
4957 | * EXTENT_BUFFER_TREE_REF set), therefore being in the process | |
4958 | * of decrementing the extent buffer's reference count twice. | |
4959 | * So here we could race and increment the eb's reference count, | |
4960 | * clear its stale flag, mark it as dirty and drop our reference | |
4961 | * before the other task finishes executing free_extent_buffer, | |
4962 | * which would later result in an attempt to free an extent | |
4963 | * buffer that is dirty. | |
4964 | */ | |
4965 | if (test_bit(EXTENT_BUFFER_STALE, &eb->bflags)) { | |
4966 | spin_lock(&eb->refs_lock); | |
4967 | spin_unlock(&eb->refs_lock); | |
4968 | } | |
2457aec6 | 4969 | mark_extent_buffer_accessed(eb, NULL); |
452c75c3 CS |
4970 | return eb; |
4971 | } | |
4972 | rcu_read_unlock(); | |
4973 | ||
4974 | return NULL; | |
4975 | } | |
4976 | ||
faa2dbf0 JB |
4977 | #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS |
4978 | struct extent_buffer *alloc_test_extent_buffer(struct btrfs_fs_info *fs_info, | |
da17066c | 4979 | u64 start) |
faa2dbf0 JB |
4980 | { |
4981 | struct extent_buffer *eb, *exists = NULL; | |
4982 | int ret; | |
4983 | ||
4984 | eb = find_extent_buffer(fs_info, start); | |
4985 | if (eb) | |
4986 | return eb; | |
da17066c | 4987 | eb = alloc_dummy_extent_buffer(fs_info, start); |
faa2dbf0 JB |
4988 | if (!eb) |
4989 | return NULL; | |
4990 | eb->fs_info = fs_info; | |
4991 | again: | |
e1860a77 | 4992 | ret = radix_tree_preload(GFP_NOFS); |
faa2dbf0 JB |
4993 | if (ret) |
4994 | goto free_eb; | |
4995 | spin_lock(&fs_info->buffer_lock); | |
4996 | ret = radix_tree_insert(&fs_info->buffer_radix, | |
09cbfeaf | 4997 | start >> PAGE_SHIFT, eb); |
faa2dbf0 JB |
4998 | spin_unlock(&fs_info->buffer_lock); |
4999 | radix_tree_preload_end(); | |
5000 | if (ret == -EEXIST) { | |
5001 | exists = find_extent_buffer(fs_info, start); | |
5002 | if (exists) | |
5003 | goto free_eb; | |
5004 | else | |
5005 | goto again; | |
5006 | } | |
5007 | check_buffer_tree_ref(eb); | |
5008 | set_bit(EXTENT_BUFFER_IN_TREE, &eb->bflags); | |
5009 | ||
5010 | /* | |
5011 | * We will free dummy extent buffer's if they come into | |
5012 | * free_extent_buffer with a ref count of 2, but if we are using this we | |
5013 | * want the buffers to stay in memory until we're done with them, so | |
5014 | * bump the ref count again. | |
5015 | */ | |
5016 | atomic_inc(&eb->refs); | |
5017 | return eb; | |
5018 | free_eb: | |
5019 | btrfs_release_extent_buffer(eb); | |
5020 | return exists; | |
5021 | } | |
5022 | #endif | |
5023 | ||
f28491e0 | 5024 | struct extent_buffer *alloc_extent_buffer(struct btrfs_fs_info *fs_info, |
ce3e6984 | 5025 | u64 start) |
d1310b2e | 5026 | { |
da17066c | 5027 | unsigned long len = fs_info->nodesize; |
d1310b2e CM |
5028 | unsigned long num_pages = num_extent_pages(start, len); |
5029 | unsigned long i; | |
09cbfeaf | 5030 | unsigned long index = start >> PAGE_SHIFT; |
d1310b2e | 5031 | struct extent_buffer *eb; |
6af118ce | 5032 | struct extent_buffer *exists = NULL; |
d1310b2e | 5033 | struct page *p; |
f28491e0 | 5034 | struct address_space *mapping = fs_info->btree_inode->i_mapping; |
d1310b2e | 5035 | int uptodate = 1; |
19fe0a8b | 5036 | int ret; |
d1310b2e | 5037 | |
da17066c | 5038 | if (!IS_ALIGNED(start, fs_info->sectorsize)) { |
c871b0f2 LB |
5039 | btrfs_err(fs_info, "bad tree block start %llu", start); |
5040 | return ERR_PTR(-EINVAL); | |
5041 | } | |
5042 | ||
f28491e0 | 5043 | eb = find_extent_buffer(fs_info, start); |
452c75c3 | 5044 | if (eb) |
6af118ce | 5045 | return eb; |
6af118ce | 5046 | |
23d79d81 | 5047 | eb = __alloc_extent_buffer(fs_info, start, len); |
2b114d1d | 5048 | if (!eb) |
c871b0f2 | 5049 | return ERR_PTR(-ENOMEM); |
d1310b2e | 5050 | |
727011e0 | 5051 | for (i = 0; i < num_pages; i++, index++) { |
d1b5c567 | 5052 | p = find_or_create_page(mapping, index, GFP_NOFS|__GFP_NOFAIL); |
c871b0f2 LB |
5053 | if (!p) { |
5054 | exists = ERR_PTR(-ENOMEM); | |
6af118ce | 5055 | goto free_eb; |
c871b0f2 | 5056 | } |
4f2de97a JB |
5057 | |
5058 | spin_lock(&mapping->private_lock); | |
5059 | if (PagePrivate(p)) { | |
5060 | /* | |
5061 | * We could have already allocated an eb for this page | |
5062 | * and attached one so lets see if we can get a ref on | |
5063 | * the existing eb, and if we can we know it's good and | |
5064 | * we can just return that one, else we know we can just | |
5065 | * overwrite page->private. | |
5066 | */ | |
5067 | exists = (struct extent_buffer *)p->private; | |
5068 | if (atomic_inc_not_zero(&exists->refs)) { | |
5069 | spin_unlock(&mapping->private_lock); | |
5070 | unlock_page(p); | |
09cbfeaf | 5071 | put_page(p); |
2457aec6 | 5072 | mark_extent_buffer_accessed(exists, p); |
4f2de97a JB |
5073 | goto free_eb; |
5074 | } | |
5ca64f45 | 5075 | exists = NULL; |
4f2de97a | 5076 | |
0b32f4bb | 5077 | /* |
4f2de97a JB |
5078 | * Do this so attach doesn't complain and we need to |
5079 | * drop the ref the old guy had. | |
5080 | */ | |
5081 | ClearPagePrivate(p); | |
0b32f4bb | 5082 | WARN_ON(PageDirty(p)); |
09cbfeaf | 5083 | put_page(p); |
d1310b2e | 5084 | } |
4f2de97a JB |
5085 | attach_extent_buffer_page(eb, p); |
5086 | spin_unlock(&mapping->private_lock); | |
0b32f4bb | 5087 | WARN_ON(PageDirty(p)); |
727011e0 | 5088 | eb->pages[i] = p; |
d1310b2e CM |
5089 | if (!PageUptodate(p)) |
5090 | uptodate = 0; | |
eb14ab8e CM |
5091 | |
5092 | /* | |
5093 | * see below about how we avoid a nasty race with release page | |
5094 | * and why we unlock later | |
5095 | */ | |
d1310b2e CM |
5096 | } |
5097 | if (uptodate) | |
b4ce94de | 5098 | set_bit(EXTENT_BUFFER_UPTODATE, &eb->bflags); |
115391d2 | 5099 | again: |
e1860a77 | 5100 | ret = radix_tree_preload(GFP_NOFS); |
c871b0f2 LB |
5101 | if (ret) { |
5102 | exists = ERR_PTR(ret); | |
19fe0a8b | 5103 | goto free_eb; |
c871b0f2 | 5104 | } |
19fe0a8b | 5105 | |
f28491e0 JB |
5106 | spin_lock(&fs_info->buffer_lock); |
5107 | ret = radix_tree_insert(&fs_info->buffer_radix, | |
09cbfeaf | 5108 | start >> PAGE_SHIFT, eb); |
f28491e0 | 5109 | spin_unlock(&fs_info->buffer_lock); |
452c75c3 | 5110 | radix_tree_preload_end(); |
19fe0a8b | 5111 | if (ret == -EEXIST) { |
f28491e0 | 5112 | exists = find_extent_buffer(fs_info, start); |
452c75c3 CS |
5113 | if (exists) |
5114 | goto free_eb; | |
5115 | else | |
115391d2 | 5116 | goto again; |
6af118ce | 5117 | } |
6af118ce | 5118 | /* add one reference for the tree */ |
0b32f4bb | 5119 | check_buffer_tree_ref(eb); |
34b41ace | 5120 | set_bit(EXTENT_BUFFER_IN_TREE, &eb->bflags); |
eb14ab8e CM |
5121 | |
5122 | /* | |
5123 | * there is a race where release page may have | |
5124 | * tried to find this extent buffer in the radix | |
5125 | * but failed. It will tell the VM it is safe to | |
5126 | * reclaim the, and it will clear the page private bit. | |
5127 | * We must make sure to set the page private bit properly | |
5128 | * after the extent buffer is in the radix tree so | |
5129 | * it doesn't get lost | |
5130 | */ | |
727011e0 CM |
5131 | SetPageChecked(eb->pages[0]); |
5132 | for (i = 1; i < num_pages; i++) { | |
fb85fc9a | 5133 | p = eb->pages[i]; |
727011e0 CM |
5134 | ClearPageChecked(p); |
5135 | unlock_page(p); | |
5136 | } | |
5137 | unlock_page(eb->pages[0]); | |
d1310b2e CM |
5138 | return eb; |
5139 | ||
6af118ce | 5140 | free_eb: |
5ca64f45 | 5141 | WARN_ON(!atomic_dec_and_test(&eb->refs)); |
727011e0 CM |
5142 | for (i = 0; i < num_pages; i++) { |
5143 | if (eb->pages[i]) | |
5144 | unlock_page(eb->pages[i]); | |
5145 | } | |
eb14ab8e | 5146 | |
897ca6e9 | 5147 | btrfs_release_extent_buffer(eb); |
6af118ce | 5148 | return exists; |
d1310b2e | 5149 | } |
d1310b2e | 5150 | |
3083ee2e JB |
5151 | static inline void btrfs_release_extent_buffer_rcu(struct rcu_head *head) |
5152 | { | |
5153 | struct extent_buffer *eb = | |
5154 | container_of(head, struct extent_buffer, rcu_head); | |
5155 | ||
5156 | __free_extent_buffer(eb); | |
5157 | } | |
5158 | ||
3083ee2e | 5159 | /* Expects to have eb->eb_lock already held */ |
f7a52a40 | 5160 | static int release_extent_buffer(struct extent_buffer *eb) |
3083ee2e JB |
5161 | { |
5162 | WARN_ON(atomic_read(&eb->refs) == 0); | |
5163 | if (atomic_dec_and_test(&eb->refs)) { | |
34b41ace | 5164 | if (test_and_clear_bit(EXTENT_BUFFER_IN_TREE, &eb->bflags)) { |
f28491e0 | 5165 | struct btrfs_fs_info *fs_info = eb->fs_info; |
3083ee2e | 5166 | |
815a51c7 | 5167 | spin_unlock(&eb->refs_lock); |
3083ee2e | 5168 | |
f28491e0 JB |
5169 | spin_lock(&fs_info->buffer_lock); |
5170 | radix_tree_delete(&fs_info->buffer_radix, | |
09cbfeaf | 5171 | eb->start >> PAGE_SHIFT); |
f28491e0 | 5172 | spin_unlock(&fs_info->buffer_lock); |
34b41ace JB |
5173 | } else { |
5174 | spin_unlock(&eb->refs_lock); | |
815a51c7 | 5175 | } |
3083ee2e JB |
5176 | |
5177 | /* Should be safe to release our pages at this point */ | |
a50924e3 | 5178 | btrfs_release_extent_buffer_page(eb); |
bcb7e449 JB |
5179 | #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS |
5180 | if (unlikely(test_bit(EXTENT_BUFFER_DUMMY, &eb->bflags))) { | |
5181 | __free_extent_buffer(eb); | |
5182 | return 1; | |
5183 | } | |
5184 | #endif | |
3083ee2e | 5185 | call_rcu(&eb->rcu_head, btrfs_release_extent_buffer_rcu); |
e64860aa | 5186 | return 1; |
3083ee2e JB |
5187 | } |
5188 | spin_unlock(&eb->refs_lock); | |
e64860aa JB |
5189 | |
5190 | return 0; | |
3083ee2e JB |
5191 | } |
5192 | ||
d1310b2e CM |
5193 | void free_extent_buffer(struct extent_buffer *eb) |
5194 | { | |
242e18c7 CM |
5195 | int refs; |
5196 | int old; | |
d1310b2e CM |
5197 | if (!eb) |
5198 | return; | |
5199 | ||
242e18c7 CM |
5200 | while (1) { |
5201 | refs = atomic_read(&eb->refs); | |
5202 | if (refs <= 3) | |
5203 | break; | |
5204 | old = atomic_cmpxchg(&eb->refs, refs, refs - 1); | |
5205 | if (old == refs) | |
5206 | return; | |
5207 | } | |
5208 | ||
3083ee2e | 5209 | spin_lock(&eb->refs_lock); |
815a51c7 JS |
5210 | if (atomic_read(&eb->refs) == 2 && |
5211 | test_bit(EXTENT_BUFFER_DUMMY, &eb->bflags)) | |
5212 | atomic_dec(&eb->refs); | |
5213 | ||
3083ee2e JB |
5214 | if (atomic_read(&eb->refs) == 2 && |
5215 | test_bit(EXTENT_BUFFER_STALE, &eb->bflags) && | |
0b32f4bb | 5216 | !extent_buffer_under_io(eb) && |
3083ee2e JB |
5217 | test_and_clear_bit(EXTENT_BUFFER_TREE_REF, &eb->bflags)) |
5218 | atomic_dec(&eb->refs); | |
5219 | ||
5220 | /* | |
5221 | * I know this is terrible, but it's temporary until we stop tracking | |
5222 | * the uptodate bits and such for the extent buffers. | |
5223 | */ | |
f7a52a40 | 5224 | release_extent_buffer(eb); |
3083ee2e JB |
5225 | } |
5226 | ||
5227 | void free_extent_buffer_stale(struct extent_buffer *eb) | |
5228 | { | |
5229 | if (!eb) | |
d1310b2e CM |
5230 | return; |
5231 | ||
3083ee2e JB |
5232 | spin_lock(&eb->refs_lock); |
5233 | set_bit(EXTENT_BUFFER_STALE, &eb->bflags); | |
5234 | ||
0b32f4bb | 5235 | if (atomic_read(&eb->refs) == 2 && !extent_buffer_under_io(eb) && |
3083ee2e JB |
5236 | test_and_clear_bit(EXTENT_BUFFER_TREE_REF, &eb->bflags)) |
5237 | atomic_dec(&eb->refs); | |
f7a52a40 | 5238 | release_extent_buffer(eb); |
d1310b2e | 5239 | } |
d1310b2e | 5240 | |
1d4284bd | 5241 | void clear_extent_buffer_dirty(struct extent_buffer *eb) |
d1310b2e | 5242 | { |
d1310b2e CM |
5243 | unsigned long i; |
5244 | unsigned long num_pages; | |
5245 | struct page *page; | |
5246 | ||
d1310b2e CM |
5247 | num_pages = num_extent_pages(eb->start, eb->len); |
5248 | ||
5249 | for (i = 0; i < num_pages; i++) { | |
fb85fc9a | 5250 | page = eb->pages[i]; |
b9473439 | 5251 | if (!PageDirty(page)) |
d2c3f4f6 CM |
5252 | continue; |
5253 | ||
a61e6f29 | 5254 | lock_page(page); |
eb14ab8e CM |
5255 | WARN_ON(!PagePrivate(page)); |
5256 | ||
d1310b2e | 5257 | clear_page_dirty_for_io(page); |
0ee0fda0 | 5258 | spin_lock_irq(&page->mapping->tree_lock); |
d1310b2e CM |
5259 | if (!PageDirty(page)) { |
5260 | radix_tree_tag_clear(&page->mapping->page_tree, | |
5261 | page_index(page), | |
5262 | PAGECACHE_TAG_DIRTY); | |
5263 | } | |
0ee0fda0 | 5264 | spin_unlock_irq(&page->mapping->tree_lock); |
bf0da8c1 | 5265 | ClearPageError(page); |
a61e6f29 | 5266 | unlock_page(page); |
d1310b2e | 5267 | } |
0b32f4bb | 5268 | WARN_ON(atomic_read(&eb->refs) == 0); |
d1310b2e | 5269 | } |
d1310b2e | 5270 | |
0b32f4bb | 5271 | int set_extent_buffer_dirty(struct extent_buffer *eb) |
d1310b2e CM |
5272 | { |
5273 | unsigned long i; | |
5274 | unsigned long num_pages; | |
b9473439 | 5275 | int was_dirty = 0; |
d1310b2e | 5276 | |
0b32f4bb JB |
5277 | check_buffer_tree_ref(eb); |
5278 | ||
b9473439 | 5279 | was_dirty = test_and_set_bit(EXTENT_BUFFER_DIRTY, &eb->bflags); |
0b32f4bb | 5280 | |
d1310b2e | 5281 | num_pages = num_extent_pages(eb->start, eb->len); |
3083ee2e | 5282 | WARN_ON(atomic_read(&eb->refs) == 0); |
0b32f4bb JB |
5283 | WARN_ON(!test_bit(EXTENT_BUFFER_TREE_REF, &eb->bflags)); |
5284 | ||
b9473439 | 5285 | for (i = 0; i < num_pages; i++) |
fb85fc9a | 5286 | set_page_dirty(eb->pages[i]); |
b9473439 | 5287 | return was_dirty; |
d1310b2e | 5288 | } |
d1310b2e | 5289 | |
69ba3927 | 5290 | void clear_extent_buffer_uptodate(struct extent_buffer *eb) |
1259ab75 CM |
5291 | { |
5292 | unsigned long i; | |
5293 | struct page *page; | |
5294 | unsigned long num_pages; | |
5295 | ||
b4ce94de | 5296 | clear_bit(EXTENT_BUFFER_UPTODATE, &eb->bflags); |
0b32f4bb | 5297 | num_pages = num_extent_pages(eb->start, eb->len); |
1259ab75 | 5298 | for (i = 0; i < num_pages; i++) { |
fb85fc9a | 5299 | page = eb->pages[i]; |
33958dc6 CM |
5300 | if (page) |
5301 | ClearPageUptodate(page); | |
1259ab75 | 5302 | } |
1259ab75 CM |
5303 | } |
5304 | ||
09c25a8c | 5305 | void set_extent_buffer_uptodate(struct extent_buffer *eb) |
d1310b2e CM |
5306 | { |
5307 | unsigned long i; | |
5308 | struct page *page; | |
5309 | unsigned long num_pages; | |
5310 | ||
0b32f4bb | 5311 | set_bit(EXTENT_BUFFER_UPTODATE, &eb->bflags); |
d1310b2e | 5312 | num_pages = num_extent_pages(eb->start, eb->len); |
d1310b2e | 5313 | for (i = 0; i < num_pages; i++) { |
fb85fc9a | 5314 | page = eb->pages[i]; |
d1310b2e CM |
5315 | SetPageUptodate(page); |
5316 | } | |
d1310b2e | 5317 | } |
d1310b2e | 5318 | |
0b32f4bb | 5319 | int extent_buffer_uptodate(struct extent_buffer *eb) |
d1310b2e | 5320 | { |
0b32f4bb | 5321 | return test_bit(EXTENT_BUFFER_UPTODATE, &eb->bflags); |
d1310b2e | 5322 | } |
d1310b2e CM |
5323 | |
5324 | int read_extent_buffer_pages(struct extent_io_tree *tree, | |
8436ea91 | 5325 | struct extent_buffer *eb, int wait, |
f188591e | 5326 | get_extent_t *get_extent, int mirror_num) |
d1310b2e CM |
5327 | { |
5328 | unsigned long i; | |
d1310b2e CM |
5329 | struct page *page; |
5330 | int err; | |
5331 | int ret = 0; | |
ce9adaa5 CM |
5332 | int locked_pages = 0; |
5333 | int all_uptodate = 1; | |
d1310b2e | 5334 | unsigned long num_pages; |
727011e0 | 5335 | unsigned long num_reads = 0; |
a86c12c7 | 5336 | struct bio *bio = NULL; |
c8b97818 | 5337 | unsigned long bio_flags = 0; |
a86c12c7 | 5338 | |
b4ce94de | 5339 | if (test_bit(EXTENT_BUFFER_UPTODATE, &eb->bflags)) |
d1310b2e CM |
5340 | return 0; |
5341 | ||
d1310b2e | 5342 | num_pages = num_extent_pages(eb->start, eb->len); |
8436ea91 | 5343 | for (i = 0; i < num_pages; i++) { |
fb85fc9a | 5344 | page = eb->pages[i]; |
bb82ab88 | 5345 | if (wait == WAIT_NONE) { |
2db04966 | 5346 | if (!trylock_page(page)) |
ce9adaa5 | 5347 | goto unlock_exit; |
d1310b2e CM |
5348 | } else { |
5349 | lock_page(page); | |
5350 | } | |
ce9adaa5 | 5351 | locked_pages++; |
2571e739 LB |
5352 | } |
5353 | /* | |
5354 | * We need to firstly lock all pages to make sure that | |
5355 | * the uptodate bit of our pages won't be affected by | |
5356 | * clear_extent_buffer_uptodate(). | |
5357 | */ | |
8436ea91 | 5358 | for (i = 0; i < num_pages; i++) { |
2571e739 | 5359 | page = eb->pages[i]; |
727011e0 CM |
5360 | if (!PageUptodate(page)) { |
5361 | num_reads++; | |
ce9adaa5 | 5362 | all_uptodate = 0; |
727011e0 | 5363 | } |
ce9adaa5 | 5364 | } |
2571e739 | 5365 | |
ce9adaa5 | 5366 | if (all_uptodate) { |
8436ea91 | 5367 | set_bit(EXTENT_BUFFER_UPTODATE, &eb->bflags); |
ce9adaa5 CM |
5368 | goto unlock_exit; |
5369 | } | |
5370 | ||
656f30db | 5371 | clear_bit(EXTENT_BUFFER_READ_ERR, &eb->bflags); |
5cf1ab56 | 5372 | eb->read_mirror = 0; |
0b32f4bb | 5373 | atomic_set(&eb->io_pages, num_reads); |
8436ea91 | 5374 | for (i = 0; i < num_pages; i++) { |
fb85fc9a | 5375 | page = eb->pages[i]; |
baf863b9 | 5376 | |
ce9adaa5 | 5377 | if (!PageUptodate(page)) { |
baf863b9 LB |
5378 | if (ret) { |
5379 | atomic_dec(&eb->io_pages); | |
5380 | unlock_page(page); | |
5381 | continue; | |
5382 | } | |
5383 | ||
f188591e | 5384 | ClearPageError(page); |
a86c12c7 | 5385 | err = __extent_read_full_page(tree, page, |
f188591e | 5386 | get_extent, &bio, |
d4c7ca86 | 5387 | mirror_num, &bio_flags, |
1f7ad75b | 5388 | REQ_META); |
baf863b9 | 5389 | if (err) { |
d1310b2e | 5390 | ret = err; |
baf863b9 LB |
5391 | /* |
5392 | * We use &bio in above __extent_read_full_page, | |
5393 | * so we ensure that if it returns error, the | |
5394 | * current page fails to add itself to bio and | |
5395 | * it's been unlocked. | |
5396 | * | |
5397 | * We must dec io_pages by ourselves. | |
5398 | */ | |
5399 | atomic_dec(&eb->io_pages); | |
5400 | } | |
d1310b2e CM |
5401 | } else { |
5402 | unlock_page(page); | |
5403 | } | |
5404 | } | |
5405 | ||
355808c2 | 5406 | if (bio) { |
1f7ad75b | 5407 | err = submit_one_bio(bio, mirror_num, bio_flags); |
79787eaa JM |
5408 | if (err) |
5409 | return err; | |
355808c2 | 5410 | } |
a86c12c7 | 5411 | |
bb82ab88 | 5412 | if (ret || wait != WAIT_COMPLETE) |
d1310b2e | 5413 | return ret; |
d397712b | 5414 | |
8436ea91 | 5415 | for (i = 0; i < num_pages; i++) { |
fb85fc9a | 5416 | page = eb->pages[i]; |
d1310b2e | 5417 | wait_on_page_locked(page); |
d397712b | 5418 | if (!PageUptodate(page)) |
d1310b2e | 5419 | ret = -EIO; |
d1310b2e | 5420 | } |
d397712b | 5421 | |
d1310b2e | 5422 | return ret; |
ce9adaa5 CM |
5423 | |
5424 | unlock_exit: | |
d397712b | 5425 | while (locked_pages > 0) { |
ce9adaa5 | 5426 | locked_pages--; |
8436ea91 JB |
5427 | page = eb->pages[locked_pages]; |
5428 | unlock_page(page); | |
ce9adaa5 CM |
5429 | } |
5430 | return ret; | |
d1310b2e | 5431 | } |
d1310b2e CM |
5432 | |
5433 | void read_extent_buffer(struct extent_buffer *eb, void *dstv, | |
5434 | unsigned long start, | |
5435 | unsigned long len) | |
5436 | { | |
5437 | size_t cur; | |
5438 | size_t offset; | |
5439 | struct page *page; | |
5440 | char *kaddr; | |
5441 | char *dst = (char *)dstv; | |
09cbfeaf KS |
5442 | size_t start_offset = eb->start & ((u64)PAGE_SIZE - 1); |
5443 | unsigned long i = (start_offset + start) >> PAGE_SHIFT; | |
d1310b2e CM |
5444 | |
5445 | WARN_ON(start > eb->len); | |
5446 | WARN_ON(start + len > eb->start + eb->len); | |
5447 | ||
09cbfeaf | 5448 | offset = (start_offset + start) & (PAGE_SIZE - 1); |
d1310b2e | 5449 | |
d397712b | 5450 | while (len > 0) { |
fb85fc9a | 5451 | page = eb->pages[i]; |
d1310b2e | 5452 | |
09cbfeaf | 5453 | cur = min(len, (PAGE_SIZE - offset)); |
a6591715 | 5454 | kaddr = page_address(page); |
d1310b2e | 5455 | memcpy(dst, kaddr + offset, cur); |
d1310b2e CM |
5456 | |
5457 | dst += cur; | |
5458 | len -= cur; | |
5459 | offset = 0; | |
5460 | i++; | |
5461 | } | |
5462 | } | |
d1310b2e | 5463 | |
550ac1d8 GH |
5464 | int read_extent_buffer_to_user(struct extent_buffer *eb, void __user *dstv, |
5465 | unsigned long start, | |
5466 | unsigned long len) | |
5467 | { | |
5468 | size_t cur; | |
5469 | size_t offset; | |
5470 | struct page *page; | |
5471 | char *kaddr; | |
5472 | char __user *dst = (char __user *)dstv; | |
09cbfeaf KS |
5473 | size_t start_offset = eb->start & ((u64)PAGE_SIZE - 1); |
5474 | unsigned long i = (start_offset + start) >> PAGE_SHIFT; | |
550ac1d8 GH |
5475 | int ret = 0; |
5476 | ||
5477 | WARN_ON(start > eb->len); | |
5478 | WARN_ON(start + len > eb->start + eb->len); | |
5479 | ||
09cbfeaf | 5480 | offset = (start_offset + start) & (PAGE_SIZE - 1); |
550ac1d8 GH |
5481 | |
5482 | while (len > 0) { | |
fb85fc9a | 5483 | page = eb->pages[i]; |
550ac1d8 | 5484 | |
09cbfeaf | 5485 | cur = min(len, (PAGE_SIZE - offset)); |
550ac1d8 GH |
5486 | kaddr = page_address(page); |
5487 | if (copy_to_user(dst, kaddr + offset, cur)) { | |
5488 | ret = -EFAULT; | |
5489 | break; | |
5490 | } | |
5491 | ||
5492 | dst += cur; | |
5493 | len -= cur; | |
5494 | offset = 0; | |
5495 | i++; | |
5496 | } | |
5497 | ||
5498 | return ret; | |
5499 | } | |
5500 | ||
415b35a5 LB |
5501 | /* |
5502 | * return 0 if the item is found within a page. | |
5503 | * return 1 if the item spans two pages. | |
5504 | * return -EINVAL otherwise. | |
5505 | */ | |
d1310b2e | 5506 | int map_private_extent_buffer(struct extent_buffer *eb, unsigned long start, |
a6591715 | 5507 | unsigned long min_len, char **map, |
d1310b2e | 5508 | unsigned long *map_start, |
a6591715 | 5509 | unsigned long *map_len) |
d1310b2e | 5510 | { |
09cbfeaf | 5511 | size_t offset = start & (PAGE_SIZE - 1); |
d1310b2e CM |
5512 | char *kaddr; |
5513 | struct page *p; | |
09cbfeaf KS |
5514 | size_t start_offset = eb->start & ((u64)PAGE_SIZE - 1); |
5515 | unsigned long i = (start_offset + start) >> PAGE_SHIFT; | |
d1310b2e | 5516 | unsigned long end_i = (start_offset + start + min_len - 1) >> |
09cbfeaf | 5517 | PAGE_SHIFT; |
d1310b2e CM |
5518 | |
5519 | if (i != end_i) | |
415b35a5 | 5520 | return 1; |
d1310b2e CM |
5521 | |
5522 | if (i == 0) { | |
5523 | offset = start_offset; | |
5524 | *map_start = 0; | |
5525 | } else { | |
5526 | offset = 0; | |
09cbfeaf | 5527 | *map_start = ((u64)i << PAGE_SHIFT) - start_offset; |
d1310b2e | 5528 | } |
d397712b | 5529 | |
d1310b2e | 5530 | if (start + min_len > eb->len) { |
5d163e0e | 5531 | WARN(1, KERN_ERR "btrfs bad mapping eb start %llu len %lu, wanted %lu %lu\n", |
c1c9ff7c | 5532 | eb->start, eb->len, start, min_len); |
85026533 | 5533 | return -EINVAL; |
d1310b2e CM |
5534 | } |
5535 | ||
fb85fc9a | 5536 | p = eb->pages[i]; |
a6591715 | 5537 | kaddr = page_address(p); |
d1310b2e | 5538 | *map = kaddr + offset; |
09cbfeaf | 5539 | *map_len = PAGE_SIZE - offset; |
d1310b2e CM |
5540 | return 0; |
5541 | } | |
d1310b2e | 5542 | |
d1310b2e CM |
5543 | int memcmp_extent_buffer(struct extent_buffer *eb, const void *ptrv, |
5544 | unsigned long start, | |
5545 | unsigned long len) | |
5546 | { | |
5547 | size_t cur; | |
5548 | size_t offset; | |
5549 | struct page *page; | |
5550 | char *kaddr; | |
5551 | char *ptr = (char *)ptrv; | |
09cbfeaf KS |
5552 | size_t start_offset = eb->start & ((u64)PAGE_SIZE - 1); |
5553 | unsigned long i = (start_offset + start) >> PAGE_SHIFT; | |
d1310b2e CM |
5554 | int ret = 0; |
5555 | ||
5556 | WARN_ON(start > eb->len); | |
5557 | WARN_ON(start + len > eb->start + eb->len); | |
5558 | ||
09cbfeaf | 5559 | offset = (start_offset + start) & (PAGE_SIZE - 1); |
d1310b2e | 5560 | |
d397712b | 5561 | while (len > 0) { |
fb85fc9a | 5562 | page = eb->pages[i]; |
d1310b2e | 5563 | |
09cbfeaf | 5564 | cur = min(len, (PAGE_SIZE - offset)); |
d1310b2e | 5565 | |
a6591715 | 5566 | kaddr = page_address(page); |
d1310b2e | 5567 | ret = memcmp(ptr, kaddr + offset, cur); |
d1310b2e CM |
5568 | if (ret) |
5569 | break; | |
5570 | ||
5571 | ptr += cur; | |
5572 | len -= cur; | |
5573 | offset = 0; | |
5574 | i++; | |
5575 | } | |
5576 | return ret; | |
5577 | } | |
d1310b2e | 5578 | |
f157bf76 DS |
5579 | void write_extent_buffer_chunk_tree_uuid(struct extent_buffer *eb, |
5580 | const void *srcv) | |
5581 | { | |
5582 | char *kaddr; | |
5583 | ||
5584 | WARN_ON(!PageUptodate(eb->pages[0])); | |
5585 | kaddr = page_address(eb->pages[0]); | |
5586 | memcpy(kaddr + offsetof(struct btrfs_header, chunk_tree_uuid), srcv, | |
5587 | BTRFS_FSID_SIZE); | |
5588 | } | |
5589 | ||
5590 | void write_extent_buffer_fsid(struct extent_buffer *eb, const void *srcv) | |
5591 | { | |
5592 | char *kaddr; | |
5593 | ||
5594 | WARN_ON(!PageUptodate(eb->pages[0])); | |
5595 | kaddr = page_address(eb->pages[0]); | |
5596 | memcpy(kaddr + offsetof(struct btrfs_header, fsid), srcv, | |
5597 | BTRFS_FSID_SIZE); | |
5598 | } | |
5599 | ||
d1310b2e CM |
5600 | void write_extent_buffer(struct extent_buffer *eb, const void *srcv, |
5601 | unsigned long start, unsigned long len) | |
5602 | { | |
5603 | size_t cur; | |
5604 | size_t offset; | |
5605 | struct page *page; | |
5606 | char *kaddr; | |
5607 | char *src = (char *)srcv; | |
09cbfeaf KS |
5608 | size_t start_offset = eb->start & ((u64)PAGE_SIZE - 1); |
5609 | unsigned long i = (start_offset + start) >> PAGE_SHIFT; | |
d1310b2e CM |
5610 | |
5611 | WARN_ON(start > eb->len); | |
5612 | WARN_ON(start + len > eb->start + eb->len); | |
5613 | ||
09cbfeaf | 5614 | offset = (start_offset + start) & (PAGE_SIZE - 1); |
d1310b2e | 5615 | |
d397712b | 5616 | while (len > 0) { |
fb85fc9a | 5617 | page = eb->pages[i]; |
d1310b2e CM |
5618 | WARN_ON(!PageUptodate(page)); |
5619 | ||
09cbfeaf | 5620 | cur = min(len, PAGE_SIZE - offset); |
a6591715 | 5621 | kaddr = page_address(page); |
d1310b2e | 5622 | memcpy(kaddr + offset, src, cur); |
d1310b2e CM |
5623 | |
5624 | src += cur; | |
5625 | len -= cur; | |
5626 | offset = 0; | |
5627 | i++; | |
5628 | } | |
5629 | } | |
d1310b2e | 5630 | |
b159fa28 DS |
5631 | void memzero_extent_buffer(struct extent_buffer *eb, unsigned long start, |
5632 | unsigned long len) | |
d1310b2e CM |
5633 | { |
5634 | size_t cur; | |
5635 | size_t offset; | |
5636 | struct page *page; | |
5637 | char *kaddr; | |
09cbfeaf KS |
5638 | size_t start_offset = eb->start & ((u64)PAGE_SIZE - 1); |
5639 | unsigned long i = (start_offset + start) >> PAGE_SHIFT; | |
d1310b2e CM |
5640 | |
5641 | WARN_ON(start > eb->len); | |
5642 | WARN_ON(start + len > eb->start + eb->len); | |
5643 | ||
09cbfeaf | 5644 | offset = (start_offset + start) & (PAGE_SIZE - 1); |
d1310b2e | 5645 | |
d397712b | 5646 | while (len > 0) { |
fb85fc9a | 5647 | page = eb->pages[i]; |
d1310b2e CM |
5648 | WARN_ON(!PageUptodate(page)); |
5649 | ||
09cbfeaf | 5650 | cur = min(len, PAGE_SIZE - offset); |
a6591715 | 5651 | kaddr = page_address(page); |
b159fa28 | 5652 | memset(kaddr + offset, 0, cur); |
d1310b2e CM |
5653 | |
5654 | len -= cur; | |
5655 | offset = 0; | |
5656 | i++; | |
5657 | } | |
5658 | } | |
d1310b2e | 5659 | |
58e8012c DS |
5660 | void copy_extent_buffer_full(struct extent_buffer *dst, |
5661 | struct extent_buffer *src) | |
5662 | { | |
5663 | int i; | |
5664 | unsigned num_pages; | |
5665 | ||
5666 | ASSERT(dst->len == src->len); | |
5667 | ||
5668 | num_pages = num_extent_pages(dst->start, dst->len); | |
5669 | for (i = 0; i < num_pages; i++) | |
5670 | copy_page(page_address(dst->pages[i]), | |
5671 | page_address(src->pages[i])); | |
5672 | } | |
5673 | ||
d1310b2e CM |
5674 | void copy_extent_buffer(struct extent_buffer *dst, struct extent_buffer *src, |
5675 | unsigned long dst_offset, unsigned long src_offset, | |
5676 | unsigned long len) | |
5677 | { | |
5678 | u64 dst_len = dst->len; | |
5679 | size_t cur; | |
5680 | size_t offset; | |
5681 | struct page *page; | |
5682 | char *kaddr; | |
09cbfeaf KS |
5683 | size_t start_offset = dst->start & ((u64)PAGE_SIZE - 1); |
5684 | unsigned long i = (start_offset + dst_offset) >> PAGE_SHIFT; | |
d1310b2e CM |
5685 | |
5686 | WARN_ON(src->len != dst_len); | |
5687 | ||
5688 | offset = (start_offset + dst_offset) & | |
09cbfeaf | 5689 | (PAGE_SIZE - 1); |
d1310b2e | 5690 | |
d397712b | 5691 | while (len > 0) { |
fb85fc9a | 5692 | page = dst->pages[i]; |
d1310b2e CM |
5693 | WARN_ON(!PageUptodate(page)); |
5694 | ||
09cbfeaf | 5695 | cur = min(len, (unsigned long)(PAGE_SIZE - offset)); |
d1310b2e | 5696 | |
a6591715 | 5697 | kaddr = page_address(page); |
d1310b2e | 5698 | read_extent_buffer(src, kaddr + offset, src_offset, cur); |
d1310b2e CM |
5699 | |
5700 | src_offset += cur; | |
5701 | len -= cur; | |
5702 | offset = 0; | |
5703 | i++; | |
5704 | } | |
5705 | } | |
d1310b2e | 5706 | |
2fe1d551 OS |
5707 | void le_bitmap_set(u8 *map, unsigned int start, int len) |
5708 | { | |
5709 | u8 *p = map + BIT_BYTE(start); | |
5710 | const unsigned int size = start + len; | |
5711 | int bits_to_set = BITS_PER_BYTE - (start % BITS_PER_BYTE); | |
5712 | u8 mask_to_set = BITMAP_FIRST_BYTE_MASK(start); | |
5713 | ||
5714 | while (len - bits_to_set >= 0) { | |
5715 | *p |= mask_to_set; | |
5716 | len -= bits_to_set; | |
5717 | bits_to_set = BITS_PER_BYTE; | |
9c894696 | 5718 | mask_to_set = ~0; |
2fe1d551 OS |
5719 | p++; |
5720 | } | |
5721 | if (len) { | |
5722 | mask_to_set &= BITMAP_LAST_BYTE_MASK(size); | |
5723 | *p |= mask_to_set; | |
5724 | } | |
5725 | } | |
5726 | ||
5727 | void le_bitmap_clear(u8 *map, unsigned int start, int len) | |
5728 | { | |
5729 | u8 *p = map + BIT_BYTE(start); | |
5730 | const unsigned int size = start + len; | |
5731 | int bits_to_clear = BITS_PER_BYTE - (start % BITS_PER_BYTE); | |
5732 | u8 mask_to_clear = BITMAP_FIRST_BYTE_MASK(start); | |
5733 | ||
5734 | while (len - bits_to_clear >= 0) { | |
5735 | *p &= ~mask_to_clear; | |
5736 | len -= bits_to_clear; | |
5737 | bits_to_clear = BITS_PER_BYTE; | |
9c894696 | 5738 | mask_to_clear = ~0; |
2fe1d551 OS |
5739 | p++; |
5740 | } | |
5741 | if (len) { | |
5742 | mask_to_clear &= BITMAP_LAST_BYTE_MASK(size); | |
5743 | *p &= ~mask_to_clear; | |
5744 | } | |
5745 | } | |
3e1e8bb7 OS |
5746 | |
5747 | /* | |
5748 | * eb_bitmap_offset() - calculate the page and offset of the byte containing the | |
5749 | * given bit number | |
5750 | * @eb: the extent buffer | |
5751 | * @start: offset of the bitmap item in the extent buffer | |
5752 | * @nr: bit number | |
5753 | * @page_index: return index of the page in the extent buffer that contains the | |
5754 | * given bit number | |
5755 | * @page_offset: return offset into the page given by page_index | |
5756 | * | |
5757 | * This helper hides the ugliness of finding the byte in an extent buffer which | |
5758 | * contains a given bit. | |
5759 | */ | |
5760 | static inline void eb_bitmap_offset(struct extent_buffer *eb, | |
5761 | unsigned long start, unsigned long nr, | |
5762 | unsigned long *page_index, | |
5763 | size_t *page_offset) | |
5764 | { | |
09cbfeaf | 5765 | size_t start_offset = eb->start & ((u64)PAGE_SIZE - 1); |
3e1e8bb7 OS |
5766 | size_t byte_offset = BIT_BYTE(nr); |
5767 | size_t offset; | |
5768 | ||
5769 | /* | |
5770 | * The byte we want is the offset of the extent buffer + the offset of | |
5771 | * the bitmap item in the extent buffer + the offset of the byte in the | |
5772 | * bitmap item. | |
5773 | */ | |
5774 | offset = start_offset + start + byte_offset; | |
5775 | ||
09cbfeaf KS |
5776 | *page_index = offset >> PAGE_SHIFT; |
5777 | *page_offset = offset & (PAGE_SIZE - 1); | |
3e1e8bb7 OS |
5778 | } |
5779 | ||
5780 | /** | |
5781 | * extent_buffer_test_bit - determine whether a bit in a bitmap item is set | |
5782 | * @eb: the extent buffer | |
5783 | * @start: offset of the bitmap item in the extent buffer | |
5784 | * @nr: bit number to test | |
5785 | */ | |
5786 | int extent_buffer_test_bit(struct extent_buffer *eb, unsigned long start, | |
5787 | unsigned long nr) | |
5788 | { | |
2fe1d551 | 5789 | u8 *kaddr; |
3e1e8bb7 OS |
5790 | struct page *page; |
5791 | unsigned long i; | |
5792 | size_t offset; | |
5793 | ||
5794 | eb_bitmap_offset(eb, start, nr, &i, &offset); | |
5795 | page = eb->pages[i]; | |
5796 | WARN_ON(!PageUptodate(page)); | |
5797 | kaddr = page_address(page); | |
5798 | return 1U & (kaddr[offset] >> (nr & (BITS_PER_BYTE - 1))); | |
5799 | } | |
5800 | ||
5801 | /** | |
5802 | * extent_buffer_bitmap_set - set an area of a bitmap | |
5803 | * @eb: the extent buffer | |
5804 | * @start: offset of the bitmap item in the extent buffer | |
5805 | * @pos: bit number of the first bit | |
5806 | * @len: number of bits to set | |
5807 | */ | |
5808 | void extent_buffer_bitmap_set(struct extent_buffer *eb, unsigned long start, | |
5809 | unsigned long pos, unsigned long len) | |
5810 | { | |
2fe1d551 | 5811 | u8 *kaddr; |
3e1e8bb7 OS |
5812 | struct page *page; |
5813 | unsigned long i; | |
5814 | size_t offset; | |
5815 | const unsigned int size = pos + len; | |
5816 | int bits_to_set = BITS_PER_BYTE - (pos % BITS_PER_BYTE); | |
2fe1d551 | 5817 | u8 mask_to_set = BITMAP_FIRST_BYTE_MASK(pos); |
3e1e8bb7 OS |
5818 | |
5819 | eb_bitmap_offset(eb, start, pos, &i, &offset); | |
5820 | page = eb->pages[i]; | |
5821 | WARN_ON(!PageUptodate(page)); | |
5822 | kaddr = page_address(page); | |
5823 | ||
5824 | while (len >= bits_to_set) { | |
5825 | kaddr[offset] |= mask_to_set; | |
5826 | len -= bits_to_set; | |
5827 | bits_to_set = BITS_PER_BYTE; | |
9c894696 | 5828 | mask_to_set = ~0; |
09cbfeaf | 5829 | if (++offset >= PAGE_SIZE && len > 0) { |
3e1e8bb7 OS |
5830 | offset = 0; |
5831 | page = eb->pages[++i]; | |
5832 | WARN_ON(!PageUptodate(page)); | |
5833 | kaddr = page_address(page); | |
5834 | } | |
5835 | } | |
5836 | if (len) { | |
5837 | mask_to_set &= BITMAP_LAST_BYTE_MASK(size); | |
5838 | kaddr[offset] |= mask_to_set; | |
5839 | } | |
5840 | } | |
5841 | ||
5842 | ||
5843 | /** | |
5844 | * extent_buffer_bitmap_clear - clear an area of a bitmap | |
5845 | * @eb: the extent buffer | |
5846 | * @start: offset of the bitmap item in the extent buffer | |
5847 | * @pos: bit number of the first bit | |
5848 | * @len: number of bits to clear | |
5849 | */ | |
5850 | void extent_buffer_bitmap_clear(struct extent_buffer *eb, unsigned long start, | |
5851 | unsigned long pos, unsigned long len) | |
5852 | { | |
2fe1d551 | 5853 | u8 *kaddr; |
3e1e8bb7 OS |
5854 | struct page *page; |
5855 | unsigned long i; | |
5856 | size_t offset; | |
5857 | const unsigned int size = pos + len; | |
5858 | int bits_to_clear = BITS_PER_BYTE - (pos % BITS_PER_BYTE); | |
2fe1d551 | 5859 | u8 mask_to_clear = BITMAP_FIRST_BYTE_MASK(pos); |
3e1e8bb7 OS |
5860 | |
5861 | eb_bitmap_offset(eb, start, pos, &i, &offset); | |
5862 | page = eb->pages[i]; | |
5863 | WARN_ON(!PageUptodate(page)); | |
5864 | kaddr = page_address(page); | |
5865 | ||
5866 | while (len >= bits_to_clear) { | |
5867 | kaddr[offset] &= ~mask_to_clear; | |
5868 | len -= bits_to_clear; | |
5869 | bits_to_clear = BITS_PER_BYTE; | |
9c894696 | 5870 | mask_to_clear = ~0; |
09cbfeaf | 5871 | if (++offset >= PAGE_SIZE && len > 0) { |
3e1e8bb7 OS |
5872 | offset = 0; |
5873 | page = eb->pages[++i]; | |
5874 | WARN_ON(!PageUptodate(page)); | |
5875 | kaddr = page_address(page); | |
5876 | } | |
5877 | } | |
5878 | if (len) { | |
5879 | mask_to_clear &= BITMAP_LAST_BYTE_MASK(size); | |
5880 | kaddr[offset] &= ~mask_to_clear; | |
5881 | } | |
5882 | } | |
5883 | ||
3387206f ST |
5884 | static inline bool areas_overlap(unsigned long src, unsigned long dst, unsigned long len) |
5885 | { | |
5886 | unsigned long distance = (src > dst) ? src - dst : dst - src; | |
5887 | return distance < len; | |
5888 | } | |
5889 | ||
d1310b2e CM |
5890 | static void copy_pages(struct page *dst_page, struct page *src_page, |
5891 | unsigned long dst_off, unsigned long src_off, | |
5892 | unsigned long len) | |
5893 | { | |
a6591715 | 5894 | char *dst_kaddr = page_address(dst_page); |
d1310b2e | 5895 | char *src_kaddr; |
727011e0 | 5896 | int must_memmove = 0; |
d1310b2e | 5897 | |
3387206f | 5898 | if (dst_page != src_page) { |
a6591715 | 5899 | src_kaddr = page_address(src_page); |
3387206f | 5900 | } else { |
d1310b2e | 5901 | src_kaddr = dst_kaddr; |
727011e0 CM |
5902 | if (areas_overlap(src_off, dst_off, len)) |
5903 | must_memmove = 1; | |
3387206f | 5904 | } |
d1310b2e | 5905 | |
727011e0 CM |
5906 | if (must_memmove) |
5907 | memmove(dst_kaddr + dst_off, src_kaddr + src_off, len); | |
5908 | else | |
5909 | memcpy(dst_kaddr + dst_off, src_kaddr + src_off, len); | |
d1310b2e CM |
5910 | } |
5911 | ||
5912 | void memcpy_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset, | |
5913 | unsigned long src_offset, unsigned long len) | |
5914 | { | |
0b246afa | 5915 | struct btrfs_fs_info *fs_info = dst->fs_info; |
d1310b2e CM |
5916 | size_t cur; |
5917 | size_t dst_off_in_page; | |
5918 | size_t src_off_in_page; | |
09cbfeaf | 5919 | size_t start_offset = dst->start & ((u64)PAGE_SIZE - 1); |
d1310b2e CM |
5920 | unsigned long dst_i; |
5921 | unsigned long src_i; | |
5922 | ||
5923 | if (src_offset + len > dst->len) { | |
0b246afa | 5924 | btrfs_err(fs_info, |
5d163e0e JM |
5925 | "memmove bogus src_offset %lu move len %lu dst len %lu", |
5926 | src_offset, len, dst->len); | |
d1310b2e CM |
5927 | BUG_ON(1); |
5928 | } | |
5929 | if (dst_offset + len > dst->len) { | |
0b246afa | 5930 | btrfs_err(fs_info, |
5d163e0e JM |
5931 | "memmove bogus dst_offset %lu move len %lu dst len %lu", |
5932 | dst_offset, len, dst->len); | |
d1310b2e CM |
5933 | BUG_ON(1); |
5934 | } | |
5935 | ||
d397712b | 5936 | while (len > 0) { |
d1310b2e | 5937 | dst_off_in_page = (start_offset + dst_offset) & |
09cbfeaf | 5938 | (PAGE_SIZE - 1); |
d1310b2e | 5939 | src_off_in_page = (start_offset + src_offset) & |
09cbfeaf | 5940 | (PAGE_SIZE - 1); |
d1310b2e | 5941 | |
09cbfeaf KS |
5942 | dst_i = (start_offset + dst_offset) >> PAGE_SHIFT; |
5943 | src_i = (start_offset + src_offset) >> PAGE_SHIFT; | |
d1310b2e | 5944 | |
09cbfeaf | 5945 | cur = min(len, (unsigned long)(PAGE_SIZE - |
d1310b2e CM |
5946 | src_off_in_page)); |
5947 | cur = min_t(unsigned long, cur, | |
09cbfeaf | 5948 | (unsigned long)(PAGE_SIZE - dst_off_in_page)); |
d1310b2e | 5949 | |
fb85fc9a | 5950 | copy_pages(dst->pages[dst_i], dst->pages[src_i], |
d1310b2e CM |
5951 | dst_off_in_page, src_off_in_page, cur); |
5952 | ||
5953 | src_offset += cur; | |
5954 | dst_offset += cur; | |
5955 | len -= cur; | |
5956 | } | |
5957 | } | |
d1310b2e CM |
5958 | |
5959 | void memmove_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset, | |
5960 | unsigned long src_offset, unsigned long len) | |
5961 | { | |
0b246afa | 5962 | struct btrfs_fs_info *fs_info = dst->fs_info; |
d1310b2e CM |
5963 | size_t cur; |
5964 | size_t dst_off_in_page; | |
5965 | size_t src_off_in_page; | |
5966 | unsigned long dst_end = dst_offset + len - 1; | |
5967 | unsigned long src_end = src_offset + len - 1; | |
09cbfeaf | 5968 | size_t start_offset = dst->start & ((u64)PAGE_SIZE - 1); |
d1310b2e CM |
5969 | unsigned long dst_i; |
5970 | unsigned long src_i; | |
5971 | ||
5972 | if (src_offset + len > dst->len) { | |
0b246afa | 5973 | btrfs_err(fs_info, |
5d163e0e JM |
5974 | "memmove bogus src_offset %lu move len %lu len %lu", |
5975 | src_offset, len, dst->len); | |
d1310b2e CM |
5976 | BUG_ON(1); |
5977 | } | |
5978 | if (dst_offset + len > dst->len) { | |
0b246afa | 5979 | btrfs_err(fs_info, |
5d163e0e JM |
5980 | "memmove bogus dst_offset %lu move len %lu len %lu", |
5981 | dst_offset, len, dst->len); | |
d1310b2e CM |
5982 | BUG_ON(1); |
5983 | } | |
727011e0 | 5984 | if (dst_offset < src_offset) { |
d1310b2e CM |
5985 | memcpy_extent_buffer(dst, dst_offset, src_offset, len); |
5986 | return; | |
5987 | } | |
d397712b | 5988 | while (len > 0) { |
09cbfeaf KS |
5989 | dst_i = (start_offset + dst_end) >> PAGE_SHIFT; |
5990 | src_i = (start_offset + src_end) >> PAGE_SHIFT; | |
d1310b2e CM |
5991 | |
5992 | dst_off_in_page = (start_offset + dst_end) & | |
09cbfeaf | 5993 | (PAGE_SIZE - 1); |
d1310b2e | 5994 | src_off_in_page = (start_offset + src_end) & |
09cbfeaf | 5995 | (PAGE_SIZE - 1); |
d1310b2e CM |
5996 | |
5997 | cur = min_t(unsigned long, len, src_off_in_page + 1); | |
5998 | cur = min(cur, dst_off_in_page + 1); | |
fb85fc9a | 5999 | copy_pages(dst->pages[dst_i], dst->pages[src_i], |
d1310b2e CM |
6000 | dst_off_in_page - cur + 1, |
6001 | src_off_in_page - cur + 1, cur); | |
6002 | ||
6003 | dst_end -= cur; | |
6004 | src_end -= cur; | |
6005 | len -= cur; | |
6006 | } | |
6007 | } | |
6af118ce | 6008 | |
f7a52a40 | 6009 | int try_release_extent_buffer(struct page *page) |
19fe0a8b | 6010 | { |
6af118ce | 6011 | struct extent_buffer *eb; |
6af118ce | 6012 | |
3083ee2e | 6013 | /* |
01327610 | 6014 | * We need to make sure nobody is attaching this page to an eb right |
3083ee2e JB |
6015 | * now. |
6016 | */ | |
6017 | spin_lock(&page->mapping->private_lock); | |
6018 | if (!PagePrivate(page)) { | |
6019 | spin_unlock(&page->mapping->private_lock); | |
4f2de97a | 6020 | return 1; |
45f49bce | 6021 | } |
6af118ce | 6022 | |
3083ee2e JB |
6023 | eb = (struct extent_buffer *)page->private; |
6024 | BUG_ON(!eb); | |
19fe0a8b MX |
6025 | |
6026 | /* | |
3083ee2e JB |
6027 | * This is a little awful but should be ok, we need to make sure that |
6028 | * the eb doesn't disappear out from under us while we're looking at | |
6029 | * this page. | |
19fe0a8b | 6030 | */ |
3083ee2e | 6031 | spin_lock(&eb->refs_lock); |
0b32f4bb | 6032 | if (atomic_read(&eb->refs) != 1 || extent_buffer_under_io(eb)) { |
3083ee2e JB |
6033 | spin_unlock(&eb->refs_lock); |
6034 | spin_unlock(&page->mapping->private_lock); | |
6035 | return 0; | |
b9473439 | 6036 | } |
3083ee2e | 6037 | spin_unlock(&page->mapping->private_lock); |
897ca6e9 | 6038 | |
19fe0a8b | 6039 | /* |
3083ee2e JB |
6040 | * If tree ref isn't set then we know the ref on this eb is a real ref, |
6041 | * so just return, this page will likely be freed soon anyway. | |
19fe0a8b | 6042 | */ |
3083ee2e JB |
6043 | if (!test_and_clear_bit(EXTENT_BUFFER_TREE_REF, &eb->bflags)) { |
6044 | spin_unlock(&eb->refs_lock); | |
6045 | return 0; | |
b9473439 | 6046 | } |
19fe0a8b | 6047 | |
f7a52a40 | 6048 | return release_extent_buffer(eb); |
6af118ce | 6049 | } |