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" |
d1310b2e | 23 | |
d1310b2e CM |
24 | static struct kmem_cache *extent_state_cache; |
25 | static struct kmem_cache *extent_buffer_cache; | |
9be3395b | 26 | static struct bio_set *btrfs_bioset; |
d1310b2e | 27 | |
27a3507d FM |
28 | static inline bool extent_state_in_tree(const struct extent_state *state) |
29 | { | |
30 | return !RB_EMPTY_NODE(&state->rb_node); | |
31 | } | |
32 | ||
6d49ba1b | 33 | #ifdef CONFIG_BTRFS_DEBUG |
d1310b2e CM |
34 | static LIST_HEAD(buffers); |
35 | static LIST_HEAD(states); | |
4bef0848 | 36 | |
d397712b | 37 | static DEFINE_SPINLOCK(leak_lock); |
6d49ba1b ES |
38 | |
39 | static inline | |
40 | void btrfs_leak_debug_add(struct list_head *new, struct list_head *head) | |
41 | { | |
42 | unsigned long flags; | |
43 | ||
44 | spin_lock_irqsave(&leak_lock, flags); | |
45 | list_add(new, head); | |
46 | spin_unlock_irqrestore(&leak_lock, flags); | |
47 | } | |
48 | ||
49 | static inline | |
50 | void btrfs_leak_debug_del(struct list_head *entry) | |
51 | { | |
52 | unsigned long flags; | |
53 | ||
54 | spin_lock_irqsave(&leak_lock, flags); | |
55 | list_del(entry); | |
56 | spin_unlock_irqrestore(&leak_lock, flags); | |
57 | } | |
58 | ||
59 | static inline | |
60 | void btrfs_leak_debug_check(void) | |
61 | { | |
62 | struct extent_state *state; | |
63 | struct extent_buffer *eb; | |
64 | ||
65 | while (!list_empty(&states)) { | |
66 | state = list_entry(states.next, struct extent_state, leak_list); | |
27a3507d FM |
67 | pr_err("BTRFS: state leak: start %llu end %llu state %lu in tree %d refs %d\n", |
68 | state->start, state->end, state->state, | |
69 | extent_state_in_tree(state), | |
c1c9ff7c | 70 | atomic_read(&state->refs)); |
6d49ba1b ES |
71 | list_del(&state->leak_list); |
72 | kmem_cache_free(extent_state_cache, state); | |
73 | } | |
74 | ||
75 | while (!list_empty(&buffers)) { | |
76 | eb = list_entry(buffers.next, struct extent_buffer, leak_list); | |
efe120a0 | 77 | printk(KERN_ERR "BTRFS: buffer leak start %llu len %lu " |
c1c9ff7c GU |
78 | "refs %d\n", |
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 DS |
98 | if (end >= PAGE_SIZE && (end % 2) == 0 && end != isize - 1) { |
99 | printk_ratelimited(KERN_DEBUG | |
efe120a0 | 100 | "BTRFS: %s: ino %llu isize %llu odd range [%llu,%llu]\n", |
c1c9ff7c | 101 | caller, btrfs_ino(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 | ||
130 | /* tells the submit_bio code to use a WRITE_SYNC */ | |
131 | unsigned int sync_io:1; | |
d1310b2e CM |
132 | }; |
133 | ||
0b32f4bb | 134 | static noinline void flush_write_bio(void *data); |
c2d904e0 JM |
135 | static inline struct btrfs_fs_info * |
136 | tree_fs_info(struct extent_io_tree *tree) | |
137 | { | |
a5dee37d JB |
138 | if (!tree->mapping) |
139 | return NULL; | |
c2d904e0 JM |
140 | return btrfs_sb(tree->mapping->host->i_sb); |
141 | } | |
0b32f4bb | 142 | |
d1310b2e CM |
143 | int __init extent_io_init(void) |
144 | { | |
837e1972 | 145 | extent_state_cache = kmem_cache_create("btrfs_extent_state", |
9601e3f6 CH |
146 | sizeof(struct extent_state), 0, |
147 | SLAB_RECLAIM_ACCOUNT | SLAB_MEM_SPREAD, NULL); | |
d1310b2e CM |
148 | if (!extent_state_cache) |
149 | return -ENOMEM; | |
150 | ||
837e1972 | 151 | extent_buffer_cache = kmem_cache_create("btrfs_extent_buffer", |
9601e3f6 CH |
152 | sizeof(struct extent_buffer), 0, |
153 | SLAB_RECLAIM_ACCOUNT | SLAB_MEM_SPREAD, NULL); | |
d1310b2e CM |
154 | if (!extent_buffer_cache) |
155 | goto free_state_cache; | |
9be3395b CM |
156 | |
157 | btrfs_bioset = bioset_create(BIO_POOL_SIZE, | |
158 | offsetof(struct btrfs_io_bio, bio)); | |
159 | if (!btrfs_bioset) | |
160 | goto free_buffer_cache; | |
b208c2f7 DW |
161 | |
162 | if (bioset_integrity_create(btrfs_bioset, BIO_POOL_SIZE)) | |
163 | goto free_bioset; | |
164 | ||
d1310b2e CM |
165 | return 0; |
166 | ||
b208c2f7 DW |
167 | free_bioset: |
168 | bioset_free(btrfs_bioset); | |
169 | btrfs_bioset = NULL; | |
170 | ||
9be3395b CM |
171 | free_buffer_cache: |
172 | kmem_cache_destroy(extent_buffer_cache); | |
173 | extent_buffer_cache = NULL; | |
174 | ||
d1310b2e CM |
175 | free_state_cache: |
176 | kmem_cache_destroy(extent_state_cache); | |
9be3395b | 177 | extent_state_cache = NULL; |
d1310b2e CM |
178 | return -ENOMEM; |
179 | } | |
180 | ||
181 | void extent_io_exit(void) | |
182 | { | |
6d49ba1b | 183 | btrfs_leak_debug_check(); |
8c0a8537 KS |
184 | |
185 | /* | |
186 | * Make sure all delayed rcu free are flushed before we | |
187 | * destroy caches. | |
188 | */ | |
189 | rcu_barrier(); | |
d1310b2e CM |
190 | if (extent_state_cache) |
191 | kmem_cache_destroy(extent_state_cache); | |
192 | if (extent_buffer_cache) | |
193 | kmem_cache_destroy(extent_buffer_cache); | |
9be3395b CM |
194 | if (btrfs_bioset) |
195 | bioset_free(btrfs_bioset); | |
d1310b2e CM |
196 | } |
197 | ||
198 | void extent_io_tree_init(struct extent_io_tree *tree, | |
f993c883 | 199 | struct address_space *mapping) |
d1310b2e | 200 | { |
6bef4d31 | 201 | tree->state = RB_ROOT; |
d1310b2e CM |
202 | tree->ops = NULL; |
203 | tree->dirty_bytes = 0; | |
70dec807 | 204 | spin_lock_init(&tree->lock); |
d1310b2e | 205 | tree->mapping = mapping; |
d1310b2e | 206 | } |
d1310b2e | 207 | |
b2950863 | 208 | static struct extent_state *alloc_extent_state(gfp_t mask) |
d1310b2e CM |
209 | { |
210 | struct extent_state *state; | |
d1310b2e CM |
211 | |
212 | state = kmem_cache_alloc(extent_state_cache, mask); | |
2b114d1d | 213 | if (!state) |
d1310b2e CM |
214 | return state; |
215 | state->state = 0; | |
d1310b2e | 216 | state->private = 0; |
27a3507d | 217 | RB_CLEAR_NODE(&state->rb_node); |
6d49ba1b | 218 | btrfs_leak_debug_add(&state->leak_list, &states); |
d1310b2e CM |
219 | atomic_set(&state->refs, 1); |
220 | init_waitqueue_head(&state->wq); | |
143bede5 | 221 | trace_alloc_extent_state(state, mask, _RET_IP_); |
d1310b2e CM |
222 | return state; |
223 | } | |
d1310b2e | 224 | |
4845e44f | 225 | void free_extent_state(struct extent_state *state) |
d1310b2e | 226 | { |
d1310b2e CM |
227 | if (!state) |
228 | return; | |
229 | if (atomic_dec_and_test(&state->refs)) { | |
27a3507d | 230 | WARN_ON(extent_state_in_tree(state)); |
6d49ba1b | 231 | btrfs_leak_debug_del(&state->leak_list); |
143bede5 | 232 | trace_free_extent_state(state, _RET_IP_); |
d1310b2e CM |
233 | kmem_cache_free(extent_state_cache, state); |
234 | } | |
235 | } | |
d1310b2e | 236 | |
f2071b21 FM |
237 | static struct rb_node *tree_insert(struct rb_root *root, |
238 | struct rb_node *search_start, | |
239 | u64 offset, | |
12cfbad9 FDBM |
240 | struct rb_node *node, |
241 | struct rb_node ***p_in, | |
242 | struct rb_node **parent_in) | |
d1310b2e | 243 | { |
f2071b21 | 244 | struct rb_node **p; |
d397712b | 245 | struct rb_node *parent = NULL; |
d1310b2e CM |
246 | struct tree_entry *entry; |
247 | ||
12cfbad9 FDBM |
248 | if (p_in && parent_in) { |
249 | p = *p_in; | |
250 | parent = *parent_in; | |
251 | goto do_insert; | |
252 | } | |
253 | ||
f2071b21 | 254 | p = search_start ? &search_start : &root->rb_node; |
d397712b | 255 | while (*p) { |
d1310b2e CM |
256 | parent = *p; |
257 | entry = rb_entry(parent, struct tree_entry, rb_node); | |
258 | ||
259 | if (offset < entry->start) | |
260 | p = &(*p)->rb_left; | |
261 | else if (offset > entry->end) | |
262 | p = &(*p)->rb_right; | |
263 | else | |
264 | return parent; | |
265 | } | |
266 | ||
12cfbad9 | 267 | do_insert: |
d1310b2e CM |
268 | rb_link_node(node, parent, p); |
269 | rb_insert_color(node, root); | |
270 | return NULL; | |
271 | } | |
272 | ||
80ea96b1 | 273 | static struct rb_node *__etree_search(struct extent_io_tree *tree, u64 offset, |
12cfbad9 FDBM |
274 | struct rb_node **prev_ret, |
275 | struct rb_node **next_ret, | |
276 | struct rb_node ***p_ret, | |
277 | struct rb_node **parent_ret) | |
d1310b2e | 278 | { |
80ea96b1 | 279 | struct rb_root *root = &tree->state; |
12cfbad9 | 280 | struct rb_node **n = &root->rb_node; |
d1310b2e CM |
281 | struct rb_node *prev = NULL; |
282 | struct rb_node *orig_prev = NULL; | |
283 | struct tree_entry *entry; | |
284 | struct tree_entry *prev_entry = NULL; | |
285 | ||
12cfbad9 FDBM |
286 | while (*n) { |
287 | prev = *n; | |
288 | entry = rb_entry(prev, struct tree_entry, rb_node); | |
d1310b2e CM |
289 | prev_entry = entry; |
290 | ||
291 | if (offset < entry->start) | |
12cfbad9 | 292 | n = &(*n)->rb_left; |
d1310b2e | 293 | else if (offset > entry->end) |
12cfbad9 | 294 | n = &(*n)->rb_right; |
d397712b | 295 | else |
12cfbad9 | 296 | return *n; |
d1310b2e CM |
297 | } |
298 | ||
12cfbad9 FDBM |
299 | if (p_ret) |
300 | *p_ret = n; | |
301 | if (parent_ret) | |
302 | *parent_ret = prev; | |
303 | ||
d1310b2e CM |
304 | if (prev_ret) { |
305 | orig_prev = prev; | |
d397712b | 306 | while (prev && offset > prev_entry->end) { |
d1310b2e CM |
307 | prev = rb_next(prev); |
308 | prev_entry = rb_entry(prev, struct tree_entry, rb_node); | |
309 | } | |
310 | *prev_ret = prev; | |
311 | prev = orig_prev; | |
312 | } | |
313 | ||
314 | if (next_ret) { | |
315 | prev_entry = rb_entry(prev, struct tree_entry, rb_node); | |
d397712b | 316 | while (prev && offset < prev_entry->start) { |
d1310b2e CM |
317 | prev = rb_prev(prev); |
318 | prev_entry = rb_entry(prev, struct tree_entry, rb_node); | |
319 | } | |
320 | *next_ret = prev; | |
321 | } | |
322 | return NULL; | |
323 | } | |
324 | ||
12cfbad9 FDBM |
325 | static inline struct rb_node * |
326 | tree_search_for_insert(struct extent_io_tree *tree, | |
327 | u64 offset, | |
328 | struct rb_node ***p_ret, | |
329 | struct rb_node **parent_ret) | |
d1310b2e | 330 | { |
70dec807 | 331 | struct rb_node *prev = NULL; |
d1310b2e | 332 | struct rb_node *ret; |
70dec807 | 333 | |
12cfbad9 | 334 | ret = __etree_search(tree, offset, &prev, NULL, p_ret, parent_ret); |
d397712b | 335 | if (!ret) |
d1310b2e CM |
336 | return prev; |
337 | return ret; | |
338 | } | |
339 | ||
12cfbad9 FDBM |
340 | static inline struct rb_node *tree_search(struct extent_io_tree *tree, |
341 | u64 offset) | |
342 | { | |
343 | return tree_search_for_insert(tree, offset, NULL, NULL); | |
344 | } | |
345 | ||
9ed74f2d JB |
346 | static void merge_cb(struct extent_io_tree *tree, struct extent_state *new, |
347 | struct extent_state *other) | |
348 | { | |
349 | if (tree->ops && tree->ops->merge_extent_hook) | |
350 | tree->ops->merge_extent_hook(tree->mapping->host, new, | |
351 | other); | |
352 | } | |
353 | ||
d1310b2e CM |
354 | /* |
355 | * utility function to look for merge candidates inside a given range. | |
356 | * Any extents with matching state are merged together into a single | |
357 | * extent in the tree. Extents with EXTENT_IO in their state field | |
358 | * are not merged because the end_io handlers need to be able to do | |
359 | * operations on them without sleeping (or doing allocations/splits). | |
360 | * | |
361 | * This should be called with the tree lock held. | |
362 | */ | |
1bf85046 JM |
363 | static void merge_state(struct extent_io_tree *tree, |
364 | struct extent_state *state) | |
d1310b2e CM |
365 | { |
366 | struct extent_state *other; | |
367 | struct rb_node *other_node; | |
368 | ||
5b21f2ed | 369 | if (state->state & (EXTENT_IOBITS | EXTENT_BOUNDARY)) |
1bf85046 | 370 | return; |
d1310b2e CM |
371 | |
372 | other_node = rb_prev(&state->rb_node); | |
373 | if (other_node) { | |
374 | other = rb_entry(other_node, struct extent_state, rb_node); | |
375 | if (other->end == state->start - 1 && | |
376 | other->state == state->state) { | |
9ed74f2d | 377 | merge_cb(tree, state, other); |
d1310b2e | 378 | state->start = other->start; |
d1310b2e | 379 | rb_erase(&other->rb_node, &tree->state); |
27a3507d | 380 | RB_CLEAR_NODE(&other->rb_node); |
d1310b2e CM |
381 | free_extent_state(other); |
382 | } | |
383 | } | |
384 | other_node = rb_next(&state->rb_node); | |
385 | if (other_node) { | |
386 | other = rb_entry(other_node, struct extent_state, rb_node); | |
387 | if (other->start == state->end + 1 && | |
388 | other->state == state->state) { | |
9ed74f2d | 389 | merge_cb(tree, state, other); |
df98b6e2 | 390 | state->end = other->end; |
df98b6e2 | 391 | rb_erase(&other->rb_node, &tree->state); |
27a3507d | 392 | RB_CLEAR_NODE(&other->rb_node); |
df98b6e2 | 393 | free_extent_state(other); |
d1310b2e CM |
394 | } |
395 | } | |
d1310b2e CM |
396 | } |
397 | ||
1bf85046 | 398 | static void set_state_cb(struct extent_io_tree *tree, |
41074888 | 399 | struct extent_state *state, unsigned long *bits) |
291d673e | 400 | { |
1bf85046 JM |
401 | if (tree->ops && tree->ops->set_bit_hook) |
402 | tree->ops->set_bit_hook(tree->mapping->host, state, bits); | |
291d673e CM |
403 | } |
404 | ||
405 | static void clear_state_cb(struct extent_io_tree *tree, | |
41074888 | 406 | struct extent_state *state, unsigned long *bits) |
291d673e | 407 | { |
9ed74f2d JB |
408 | if (tree->ops && tree->ops->clear_bit_hook) |
409 | tree->ops->clear_bit_hook(tree->mapping->host, state, bits); | |
291d673e CM |
410 | } |
411 | ||
3150b699 | 412 | static void set_state_bits(struct extent_io_tree *tree, |
41074888 | 413 | struct extent_state *state, unsigned long *bits); |
3150b699 | 414 | |
d1310b2e CM |
415 | /* |
416 | * insert an extent_state struct into the tree. 'bits' are set on the | |
417 | * struct before it is inserted. | |
418 | * | |
419 | * This may return -EEXIST if the extent is already there, in which case the | |
420 | * state struct is freed. | |
421 | * | |
422 | * The tree lock is not taken internally. This is a utility function and | |
423 | * probably isn't what you want to call (see set/clear_extent_bit). | |
424 | */ | |
425 | static int insert_state(struct extent_io_tree *tree, | |
426 | struct extent_state *state, u64 start, u64 end, | |
12cfbad9 FDBM |
427 | struct rb_node ***p, |
428 | struct rb_node **parent, | |
41074888 | 429 | unsigned long *bits) |
d1310b2e CM |
430 | { |
431 | struct rb_node *node; | |
432 | ||
31b1a2bd | 433 | if (end < start) |
efe120a0 | 434 | WARN(1, KERN_ERR "BTRFS: end < start %llu %llu\n", |
c1c9ff7c | 435 | end, start); |
d1310b2e CM |
436 | state->start = start; |
437 | state->end = end; | |
9ed74f2d | 438 | |
3150b699 XG |
439 | set_state_bits(tree, state, bits); |
440 | ||
f2071b21 | 441 | node = tree_insert(&tree->state, NULL, end, &state->rb_node, p, parent); |
d1310b2e CM |
442 | if (node) { |
443 | struct extent_state *found; | |
444 | found = rb_entry(node, struct extent_state, rb_node); | |
efe120a0 | 445 | printk(KERN_ERR "BTRFS: found node %llu %llu on insert of " |
c1c9ff7c GU |
446 | "%llu %llu\n", |
447 | found->start, found->end, start, end); | |
d1310b2e CM |
448 | return -EEXIST; |
449 | } | |
450 | merge_state(tree, state); | |
451 | return 0; | |
452 | } | |
453 | ||
1bf85046 | 454 | static void split_cb(struct extent_io_tree *tree, struct extent_state *orig, |
9ed74f2d JB |
455 | u64 split) |
456 | { | |
457 | if (tree->ops && tree->ops->split_extent_hook) | |
1bf85046 | 458 | tree->ops->split_extent_hook(tree->mapping->host, orig, split); |
9ed74f2d JB |
459 | } |
460 | ||
d1310b2e CM |
461 | /* |
462 | * split a given extent state struct in two, inserting the preallocated | |
463 | * struct 'prealloc' as the newly created second half. 'split' indicates an | |
464 | * offset inside 'orig' where it should be split. | |
465 | * | |
466 | * Before calling, | |
467 | * the tree has 'orig' at [orig->start, orig->end]. After calling, there | |
468 | * are two extent state structs in the tree: | |
469 | * prealloc: [orig->start, split - 1] | |
470 | * orig: [ split, orig->end ] | |
471 | * | |
472 | * The tree locks are not taken by this function. They need to be held | |
473 | * by the caller. | |
474 | */ | |
475 | static int split_state(struct extent_io_tree *tree, struct extent_state *orig, | |
476 | struct extent_state *prealloc, u64 split) | |
477 | { | |
478 | struct rb_node *node; | |
9ed74f2d JB |
479 | |
480 | split_cb(tree, orig, split); | |
481 | ||
d1310b2e CM |
482 | prealloc->start = orig->start; |
483 | prealloc->end = split - 1; | |
484 | prealloc->state = orig->state; | |
485 | orig->start = split; | |
486 | ||
f2071b21 FM |
487 | node = tree_insert(&tree->state, &orig->rb_node, prealloc->end, |
488 | &prealloc->rb_node, NULL, NULL); | |
d1310b2e | 489 | if (node) { |
d1310b2e CM |
490 | free_extent_state(prealloc); |
491 | return -EEXIST; | |
492 | } | |
493 | return 0; | |
494 | } | |
495 | ||
cdc6a395 LZ |
496 | static struct extent_state *next_state(struct extent_state *state) |
497 | { | |
498 | struct rb_node *next = rb_next(&state->rb_node); | |
499 | if (next) | |
500 | return rb_entry(next, struct extent_state, rb_node); | |
501 | else | |
502 | return NULL; | |
503 | } | |
504 | ||
d1310b2e CM |
505 | /* |
506 | * utility function to clear some bits in an extent state struct. | |
1b303fc0 | 507 | * it will optionally wake up any one waiting on this state (wake == 1). |
d1310b2e CM |
508 | * |
509 | * If no bits are set on the state struct after clearing things, the | |
510 | * struct is freed and removed from the tree | |
511 | */ | |
cdc6a395 LZ |
512 | static struct extent_state *clear_state_bit(struct extent_io_tree *tree, |
513 | struct extent_state *state, | |
41074888 | 514 | unsigned long *bits, int wake) |
d1310b2e | 515 | { |
cdc6a395 | 516 | struct extent_state *next; |
41074888 | 517 | unsigned long bits_to_clear = *bits & ~EXTENT_CTLBITS; |
d1310b2e | 518 | |
0ca1f7ce | 519 | if ((bits_to_clear & EXTENT_DIRTY) && (state->state & EXTENT_DIRTY)) { |
d1310b2e CM |
520 | u64 range = state->end - state->start + 1; |
521 | WARN_ON(range > tree->dirty_bytes); | |
522 | tree->dirty_bytes -= range; | |
523 | } | |
291d673e | 524 | clear_state_cb(tree, state, bits); |
32c00aff | 525 | state->state &= ~bits_to_clear; |
d1310b2e CM |
526 | if (wake) |
527 | wake_up(&state->wq); | |
0ca1f7ce | 528 | if (state->state == 0) { |
cdc6a395 | 529 | next = next_state(state); |
27a3507d | 530 | if (extent_state_in_tree(state)) { |
d1310b2e | 531 | rb_erase(&state->rb_node, &tree->state); |
27a3507d | 532 | RB_CLEAR_NODE(&state->rb_node); |
d1310b2e CM |
533 | free_extent_state(state); |
534 | } else { | |
535 | WARN_ON(1); | |
536 | } | |
537 | } else { | |
538 | merge_state(tree, state); | |
cdc6a395 | 539 | next = next_state(state); |
d1310b2e | 540 | } |
cdc6a395 | 541 | return next; |
d1310b2e CM |
542 | } |
543 | ||
8233767a XG |
544 | static struct extent_state * |
545 | alloc_extent_state_atomic(struct extent_state *prealloc) | |
546 | { | |
547 | if (!prealloc) | |
548 | prealloc = alloc_extent_state(GFP_ATOMIC); | |
549 | ||
550 | return prealloc; | |
551 | } | |
552 | ||
48a3b636 | 553 | static void extent_io_tree_panic(struct extent_io_tree *tree, int err) |
c2d904e0 JM |
554 | { |
555 | btrfs_panic(tree_fs_info(tree), err, "Locking error: " | |
556 | "Extent tree was modified by another " | |
557 | "thread while locked."); | |
558 | } | |
559 | ||
d1310b2e CM |
560 | /* |
561 | * clear some bits on a range in the tree. This may require splitting | |
562 | * or inserting elements in the tree, so the gfp mask is used to | |
563 | * indicate which allocations or sleeping are allowed. | |
564 | * | |
565 | * pass 'wake' == 1 to kick any sleepers, and 'delete' == 1 to remove | |
566 | * the given range from the tree regardless of state (ie for truncate). | |
567 | * | |
568 | * the range [start, end] is inclusive. | |
569 | * | |
6763af84 | 570 | * This takes the tree lock, and returns 0 on success and < 0 on error. |
d1310b2e CM |
571 | */ |
572 | int clear_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, | |
41074888 | 573 | unsigned long bits, int wake, int delete, |
2c64c53d CM |
574 | struct extent_state **cached_state, |
575 | gfp_t mask) | |
d1310b2e CM |
576 | { |
577 | struct extent_state *state; | |
2c64c53d | 578 | struct extent_state *cached; |
d1310b2e CM |
579 | struct extent_state *prealloc = NULL; |
580 | struct rb_node *node; | |
5c939df5 | 581 | u64 last_end; |
d1310b2e | 582 | int err; |
2ac55d41 | 583 | int clear = 0; |
d1310b2e | 584 | |
a5dee37d | 585 | btrfs_debug_check_extent_io_range(tree, start, end); |
8d599ae1 | 586 | |
7ee9e440 JB |
587 | if (bits & EXTENT_DELALLOC) |
588 | bits |= EXTENT_NORESERVE; | |
589 | ||
0ca1f7ce YZ |
590 | if (delete) |
591 | bits |= ~EXTENT_CTLBITS; | |
592 | bits |= EXTENT_FIRST_DELALLOC; | |
593 | ||
2ac55d41 JB |
594 | if (bits & (EXTENT_IOBITS | EXTENT_BOUNDARY)) |
595 | clear = 1; | |
d1310b2e CM |
596 | again: |
597 | if (!prealloc && (mask & __GFP_WAIT)) { | |
598 | prealloc = alloc_extent_state(mask); | |
599 | if (!prealloc) | |
600 | return -ENOMEM; | |
601 | } | |
602 | ||
cad321ad | 603 | spin_lock(&tree->lock); |
2c64c53d CM |
604 | if (cached_state) { |
605 | cached = *cached_state; | |
2ac55d41 JB |
606 | |
607 | if (clear) { | |
608 | *cached_state = NULL; | |
609 | cached_state = NULL; | |
610 | } | |
611 | ||
27a3507d FM |
612 | if (cached && extent_state_in_tree(cached) && |
613 | cached->start <= start && cached->end > start) { | |
2ac55d41 JB |
614 | if (clear) |
615 | atomic_dec(&cached->refs); | |
2c64c53d | 616 | state = cached; |
42daec29 | 617 | goto hit_next; |
2c64c53d | 618 | } |
2ac55d41 JB |
619 | if (clear) |
620 | free_extent_state(cached); | |
2c64c53d | 621 | } |
d1310b2e CM |
622 | /* |
623 | * this search will find the extents that end after | |
624 | * our range starts | |
625 | */ | |
80ea96b1 | 626 | node = tree_search(tree, start); |
d1310b2e CM |
627 | if (!node) |
628 | goto out; | |
629 | state = rb_entry(node, struct extent_state, rb_node); | |
2c64c53d | 630 | hit_next: |
d1310b2e CM |
631 | if (state->start > end) |
632 | goto out; | |
633 | WARN_ON(state->end < start); | |
5c939df5 | 634 | last_end = state->end; |
d1310b2e | 635 | |
0449314a | 636 | /* the state doesn't have the wanted bits, go ahead */ |
cdc6a395 LZ |
637 | if (!(state->state & bits)) { |
638 | state = next_state(state); | |
0449314a | 639 | goto next; |
cdc6a395 | 640 | } |
0449314a | 641 | |
d1310b2e CM |
642 | /* |
643 | * | ---- desired range ---- | | |
644 | * | state | or | |
645 | * | ------------- state -------------- | | |
646 | * | |
647 | * We need to split the extent we found, and may flip | |
648 | * bits on second half. | |
649 | * | |
650 | * If the extent we found extends past our range, we | |
651 | * just split and search again. It'll get split again | |
652 | * the next time though. | |
653 | * | |
654 | * If the extent we found is inside our range, we clear | |
655 | * the desired bit on it. | |
656 | */ | |
657 | ||
658 | if (state->start < start) { | |
8233767a XG |
659 | prealloc = alloc_extent_state_atomic(prealloc); |
660 | BUG_ON(!prealloc); | |
d1310b2e | 661 | err = split_state(tree, state, prealloc, start); |
c2d904e0 JM |
662 | if (err) |
663 | extent_io_tree_panic(tree, err); | |
664 | ||
d1310b2e CM |
665 | prealloc = NULL; |
666 | if (err) | |
667 | goto out; | |
668 | if (state->end <= end) { | |
d1ac6e41 LB |
669 | state = clear_state_bit(tree, state, &bits, wake); |
670 | goto next; | |
d1310b2e CM |
671 | } |
672 | goto search_again; | |
673 | } | |
674 | /* | |
675 | * | ---- desired range ---- | | |
676 | * | state | | |
677 | * We need to split the extent, and clear the bit | |
678 | * on the first half | |
679 | */ | |
680 | if (state->start <= end && state->end > end) { | |
8233767a XG |
681 | prealloc = alloc_extent_state_atomic(prealloc); |
682 | BUG_ON(!prealloc); | |
d1310b2e | 683 | err = split_state(tree, state, prealloc, end + 1); |
c2d904e0 JM |
684 | if (err) |
685 | extent_io_tree_panic(tree, err); | |
686 | ||
d1310b2e CM |
687 | if (wake) |
688 | wake_up(&state->wq); | |
42daec29 | 689 | |
6763af84 | 690 | clear_state_bit(tree, prealloc, &bits, wake); |
9ed74f2d | 691 | |
d1310b2e CM |
692 | prealloc = NULL; |
693 | goto out; | |
694 | } | |
42daec29 | 695 | |
cdc6a395 | 696 | state = clear_state_bit(tree, state, &bits, wake); |
0449314a | 697 | next: |
5c939df5 YZ |
698 | if (last_end == (u64)-1) |
699 | goto out; | |
700 | start = last_end + 1; | |
cdc6a395 | 701 | if (start <= end && state && !need_resched()) |
692e5759 | 702 | goto hit_next; |
d1310b2e CM |
703 | goto search_again; |
704 | ||
705 | out: | |
cad321ad | 706 | spin_unlock(&tree->lock); |
d1310b2e CM |
707 | if (prealloc) |
708 | free_extent_state(prealloc); | |
709 | ||
6763af84 | 710 | return 0; |
d1310b2e CM |
711 | |
712 | search_again: | |
713 | if (start > end) | |
714 | goto out; | |
cad321ad | 715 | spin_unlock(&tree->lock); |
d1310b2e CM |
716 | if (mask & __GFP_WAIT) |
717 | cond_resched(); | |
718 | goto again; | |
719 | } | |
d1310b2e | 720 | |
143bede5 JM |
721 | static void wait_on_state(struct extent_io_tree *tree, |
722 | struct extent_state *state) | |
641f5219 CH |
723 | __releases(tree->lock) |
724 | __acquires(tree->lock) | |
d1310b2e CM |
725 | { |
726 | DEFINE_WAIT(wait); | |
727 | prepare_to_wait(&state->wq, &wait, TASK_UNINTERRUPTIBLE); | |
cad321ad | 728 | spin_unlock(&tree->lock); |
d1310b2e | 729 | schedule(); |
cad321ad | 730 | spin_lock(&tree->lock); |
d1310b2e | 731 | finish_wait(&state->wq, &wait); |
d1310b2e CM |
732 | } |
733 | ||
734 | /* | |
735 | * waits for one or more bits to clear on a range in the state tree. | |
736 | * The range [start, end] is inclusive. | |
737 | * The tree lock is taken by this function | |
738 | */ | |
41074888 DS |
739 | static void wait_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, |
740 | unsigned long bits) | |
d1310b2e CM |
741 | { |
742 | struct extent_state *state; | |
743 | struct rb_node *node; | |
744 | ||
a5dee37d | 745 | btrfs_debug_check_extent_io_range(tree, start, end); |
8d599ae1 | 746 | |
cad321ad | 747 | spin_lock(&tree->lock); |
d1310b2e CM |
748 | again: |
749 | while (1) { | |
750 | /* | |
751 | * this search will find all the extents that end after | |
752 | * our range starts | |
753 | */ | |
80ea96b1 | 754 | node = tree_search(tree, start); |
c50d3e71 | 755 | process_node: |
d1310b2e CM |
756 | if (!node) |
757 | break; | |
758 | ||
759 | state = rb_entry(node, struct extent_state, rb_node); | |
760 | ||
761 | if (state->start > end) | |
762 | goto out; | |
763 | ||
764 | if (state->state & bits) { | |
765 | start = state->start; | |
766 | atomic_inc(&state->refs); | |
767 | wait_on_state(tree, state); | |
768 | free_extent_state(state); | |
769 | goto again; | |
770 | } | |
771 | start = state->end + 1; | |
772 | ||
773 | if (start > end) | |
774 | break; | |
775 | ||
c50d3e71 FM |
776 | if (!cond_resched_lock(&tree->lock)) { |
777 | node = rb_next(node); | |
778 | goto process_node; | |
779 | } | |
d1310b2e CM |
780 | } |
781 | out: | |
cad321ad | 782 | spin_unlock(&tree->lock); |
d1310b2e | 783 | } |
d1310b2e | 784 | |
1bf85046 | 785 | static void set_state_bits(struct extent_io_tree *tree, |
d1310b2e | 786 | struct extent_state *state, |
41074888 | 787 | unsigned long *bits) |
d1310b2e | 788 | { |
41074888 | 789 | unsigned long bits_to_set = *bits & ~EXTENT_CTLBITS; |
9ed74f2d | 790 | |
1bf85046 | 791 | set_state_cb(tree, state, bits); |
0ca1f7ce | 792 | if ((bits_to_set & EXTENT_DIRTY) && !(state->state & EXTENT_DIRTY)) { |
d1310b2e CM |
793 | u64 range = state->end - state->start + 1; |
794 | tree->dirty_bytes += range; | |
795 | } | |
0ca1f7ce | 796 | state->state |= bits_to_set; |
d1310b2e CM |
797 | } |
798 | ||
e38e2ed7 FM |
799 | static void cache_state_if_flags(struct extent_state *state, |
800 | struct extent_state **cached_ptr, | |
801 | const u64 flags) | |
2c64c53d CM |
802 | { |
803 | if (cached_ptr && !(*cached_ptr)) { | |
e38e2ed7 | 804 | if (!flags || (state->state & flags)) { |
2c64c53d CM |
805 | *cached_ptr = state; |
806 | atomic_inc(&state->refs); | |
807 | } | |
808 | } | |
809 | } | |
810 | ||
e38e2ed7 FM |
811 | static void cache_state(struct extent_state *state, |
812 | struct extent_state **cached_ptr) | |
813 | { | |
814 | return cache_state_if_flags(state, cached_ptr, | |
815 | EXTENT_IOBITS | EXTENT_BOUNDARY); | |
816 | } | |
817 | ||
d1310b2e | 818 | /* |
1edbb734 CM |
819 | * set some bits on a range in the tree. This may require allocations or |
820 | * sleeping, so the gfp mask is used to indicate what is allowed. | |
d1310b2e | 821 | * |
1edbb734 CM |
822 | * If any of the exclusive bits are set, this will fail with -EEXIST if some |
823 | * part of the range already has the desired bits set. The start of the | |
824 | * existing range is returned in failed_start in this case. | |
d1310b2e | 825 | * |
1edbb734 | 826 | * [start, end] is inclusive This takes the tree lock. |
d1310b2e | 827 | */ |
1edbb734 | 828 | |
3fbe5c02 JM |
829 | static int __must_check |
830 | __set_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, | |
41074888 DS |
831 | unsigned long bits, unsigned long exclusive_bits, |
832 | u64 *failed_start, struct extent_state **cached_state, | |
833 | gfp_t mask) | |
d1310b2e CM |
834 | { |
835 | struct extent_state *state; | |
836 | struct extent_state *prealloc = NULL; | |
837 | struct rb_node *node; | |
12cfbad9 FDBM |
838 | struct rb_node **p; |
839 | struct rb_node *parent; | |
d1310b2e | 840 | int err = 0; |
d1310b2e CM |
841 | u64 last_start; |
842 | u64 last_end; | |
42daec29 | 843 | |
a5dee37d | 844 | btrfs_debug_check_extent_io_range(tree, start, end); |
8d599ae1 | 845 | |
0ca1f7ce | 846 | bits |= EXTENT_FIRST_DELALLOC; |
d1310b2e CM |
847 | again: |
848 | if (!prealloc && (mask & __GFP_WAIT)) { | |
849 | prealloc = alloc_extent_state(mask); | |
8233767a | 850 | BUG_ON(!prealloc); |
d1310b2e CM |
851 | } |
852 | ||
cad321ad | 853 | spin_lock(&tree->lock); |
9655d298 CM |
854 | if (cached_state && *cached_state) { |
855 | state = *cached_state; | |
df98b6e2 | 856 | if (state->start <= start && state->end > start && |
27a3507d | 857 | extent_state_in_tree(state)) { |
9655d298 CM |
858 | node = &state->rb_node; |
859 | goto hit_next; | |
860 | } | |
861 | } | |
d1310b2e CM |
862 | /* |
863 | * this search will find all the extents that end after | |
864 | * our range starts. | |
865 | */ | |
12cfbad9 | 866 | node = tree_search_for_insert(tree, start, &p, &parent); |
d1310b2e | 867 | if (!node) { |
8233767a XG |
868 | prealloc = alloc_extent_state_atomic(prealloc); |
869 | BUG_ON(!prealloc); | |
12cfbad9 FDBM |
870 | err = insert_state(tree, prealloc, start, end, |
871 | &p, &parent, &bits); | |
c2d904e0 JM |
872 | if (err) |
873 | extent_io_tree_panic(tree, err); | |
874 | ||
c42ac0bc | 875 | cache_state(prealloc, cached_state); |
d1310b2e | 876 | prealloc = NULL; |
d1310b2e CM |
877 | goto out; |
878 | } | |
d1310b2e | 879 | state = rb_entry(node, struct extent_state, rb_node); |
40431d6c | 880 | hit_next: |
d1310b2e CM |
881 | last_start = state->start; |
882 | last_end = state->end; | |
883 | ||
884 | /* | |
885 | * | ---- desired range ---- | | |
886 | * | state | | |
887 | * | |
888 | * Just lock what we found and keep going | |
889 | */ | |
890 | if (state->start == start && state->end <= end) { | |
1edbb734 | 891 | if (state->state & exclusive_bits) { |
d1310b2e CM |
892 | *failed_start = state->start; |
893 | err = -EEXIST; | |
894 | goto out; | |
895 | } | |
42daec29 | 896 | |
1bf85046 | 897 | set_state_bits(tree, state, &bits); |
2c64c53d | 898 | cache_state(state, cached_state); |
d1310b2e | 899 | merge_state(tree, state); |
5c939df5 YZ |
900 | if (last_end == (u64)-1) |
901 | goto out; | |
902 | start = last_end + 1; | |
d1ac6e41 LB |
903 | state = next_state(state); |
904 | if (start < end && state && state->start == start && | |
905 | !need_resched()) | |
906 | goto hit_next; | |
d1310b2e CM |
907 | goto search_again; |
908 | } | |
909 | ||
910 | /* | |
911 | * | ---- desired range ---- | | |
912 | * | state | | |
913 | * or | |
914 | * | ------------- state -------------- | | |
915 | * | |
916 | * We need to split the extent we found, and may flip bits on | |
917 | * second half. | |
918 | * | |
919 | * If the extent we found extends past our | |
920 | * range, we just split and search again. It'll get split | |
921 | * again the next time though. | |
922 | * | |
923 | * If the extent we found is inside our range, we set the | |
924 | * desired bit on it. | |
925 | */ | |
926 | if (state->start < start) { | |
1edbb734 | 927 | if (state->state & exclusive_bits) { |
d1310b2e CM |
928 | *failed_start = start; |
929 | err = -EEXIST; | |
930 | goto out; | |
931 | } | |
8233767a XG |
932 | |
933 | prealloc = alloc_extent_state_atomic(prealloc); | |
934 | BUG_ON(!prealloc); | |
d1310b2e | 935 | err = split_state(tree, state, prealloc, start); |
c2d904e0 JM |
936 | if (err) |
937 | extent_io_tree_panic(tree, err); | |
938 | ||
d1310b2e CM |
939 | prealloc = NULL; |
940 | if (err) | |
941 | goto out; | |
942 | if (state->end <= end) { | |
1bf85046 | 943 | set_state_bits(tree, state, &bits); |
2c64c53d | 944 | cache_state(state, cached_state); |
d1310b2e | 945 | merge_state(tree, state); |
5c939df5 YZ |
946 | if (last_end == (u64)-1) |
947 | goto out; | |
948 | start = last_end + 1; | |
d1ac6e41 LB |
949 | state = next_state(state); |
950 | if (start < end && state && state->start == start && | |
951 | !need_resched()) | |
952 | goto hit_next; | |
d1310b2e CM |
953 | } |
954 | goto search_again; | |
955 | } | |
956 | /* | |
957 | * | ---- desired range ---- | | |
958 | * | state | or | state | | |
959 | * | |
960 | * There's a hole, we need to insert something in it and | |
961 | * ignore the extent we found. | |
962 | */ | |
963 | if (state->start > start) { | |
964 | u64 this_end; | |
965 | if (end < last_start) | |
966 | this_end = end; | |
967 | else | |
d397712b | 968 | this_end = last_start - 1; |
8233767a XG |
969 | |
970 | prealloc = alloc_extent_state_atomic(prealloc); | |
971 | BUG_ON(!prealloc); | |
c7f895a2 XG |
972 | |
973 | /* | |
974 | * Avoid to free 'prealloc' if it can be merged with | |
975 | * the later extent. | |
976 | */ | |
d1310b2e | 977 | err = insert_state(tree, prealloc, start, this_end, |
12cfbad9 | 978 | NULL, NULL, &bits); |
c2d904e0 JM |
979 | if (err) |
980 | extent_io_tree_panic(tree, err); | |
981 | ||
9ed74f2d JB |
982 | cache_state(prealloc, cached_state); |
983 | prealloc = NULL; | |
d1310b2e CM |
984 | start = this_end + 1; |
985 | goto search_again; | |
986 | } | |
987 | /* | |
988 | * | ---- desired range ---- | | |
989 | * | state | | |
990 | * We need to split the extent, and set the bit | |
991 | * on the first half | |
992 | */ | |
993 | if (state->start <= end && state->end > end) { | |
1edbb734 | 994 | if (state->state & exclusive_bits) { |
d1310b2e CM |
995 | *failed_start = start; |
996 | err = -EEXIST; | |
997 | goto out; | |
998 | } | |
8233767a XG |
999 | |
1000 | prealloc = alloc_extent_state_atomic(prealloc); | |
1001 | BUG_ON(!prealloc); | |
d1310b2e | 1002 | err = split_state(tree, state, prealloc, end + 1); |
c2d904e0 JM |
1003 | if (err) |
1004 | extent_io_tree_panic(tree, err); | |
d1310b2e | 1005 | |
1bf85046 | 1006 | set_state_bits(tree, prealloc, &bits); |
2c64c53d | 1007 | cache_state(prealloc, cached_state); |
d1310b2e CM |
1008 | merge_state(tree, prealloc); |
1009 | prealloc = NULL; | |
1010 | goto out; | |
1011 | } | |
1012 | ||
1013 | goto search_again; | |
1014 | ||
1015 | out: | |
cad321ad | 1016 | spin_unlock(&tree->lock); |
d1310b2e CM |
1017 | if (prealloc) |
1018 | free_extent_state(prealloc); | |
1019 | ||
1020 | return err; | |
1021 | ||
1022 | search_again: | |
1023 | if (start > end) | |
1024 | goto out; | |
cad321ad | 1025 | spin_unlock(&tree->lock); |
d1310b2e CM |
1026 | if (mask & __GFP_WAIT) |
1027 | cond_resched(); | |
1028 | goto again; | |
1029 | } | |
d1310b2e | 1030 | |
41074888 DS |
1031 | int set_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, |
1032 | unsigned long bits, u64 * failed_start, | |
1033 | struct extent_state **cached_state, gfp_t mask) | |
3fbe5c02 JM |
1034 | { |
1035 | return __set_extent_bit(tree, start, end, bits, 0, failed_start, | |
1036 | cached_state, mask); | |
1037 | } | |
1038 | ||
1039 | ||
462d6fac | 1040 | /** |
10983f2e LB |
1041 | * convert_extent_bit - convert all bits in a given range from one bit to |
1042 | * another | |
462d6fac JB |
1043 | * @tree: the io tree to search |
1044 | * @start: the start offset in bytes | |
1045 | * @end: the end offset in bytes (inclusive) | |
1046 | * @bits: the bits to set in this range | |
1047 | * @clear_bits: the bits to clear in this range | |
e6138876 | 1048 | * @cached_state: state that we're going to cache |
462d6fac JB |
1049 | * @mask: the allocation mask |
1050 | * | |
1051 | * This will go through and set bits for the given range. If any states exist | |
1052 | * already in this range they are set with the given bit and cleared of the | |
1053 | * clear_bits. This is only meant to be used by things that are mergeable, ie | |
1054 | * converting from say DELALLOC to DIRTY. This is not meant to be used with | |
1055 | * boundary bits like LOCK. | |
1056 | */ | |
1057 | int convert_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, | |
41074888 | 1058 | unsigned long bits, unsigned long clear_bits, |
e6138876 | 1059 | struct extent_state **cached_state, gfp_t mask) |
462d6fac JB |
1060 | { |
1061 | struct extent_state *state; | |
1062 | struct extent_state *prealloc = NULL; | |
1063 | struct rb_node *node; | |
12cfbad9 FDBM |
1064 | struct rb_node **p; |
1065 | struct rb_node *parent; | |
462d6fac JB |
1066 | int err = 0; |
1067 | u64 last_start; | |
1068 | u64 last_end; | |
1069 | ||
a5dee37d | 1070 | btrfs_debug_check_extent_io_range(tree, start, end); |
8d599ae1 | 1071 | |
462d6fac JB |
1072 | again: |
1073 | if (!prealloc && (mask & __GFP_WAIT)) { | |
1074 | prealloc = alloc_extent_state(mask); | |
1075 | if (!prealloc) | |
1076 | return -ENOMEM; | |
1077 | } | |
1078 | ||
1079 | spin_lock(&tree->lock); | |
e6138876 JB |
1080 | if (cached_state && *cached_state) { |
1081 | state = *cached_state; | |
1082 | if (state->start <= start && state->end > start && | |
27a3507d | 1083 | extent_state_in_tree(state)) { |
e6138876 JB |
1084 | node = &state->rb_node; |
1085 | goto hit_next; | |
1086 | } | |
1087 | } | |
1088 | ||
462d6fac JB |
1089 | /* |
1090 | * this search will find all the extents that end after | |
1091 | * our range starts. | |
1092 | */ | |
12cfbad9 | 1093 | node = tree_search_for_insert(tree, start, &p, &parent); |
462d6fac JB |
1094 | if (!node) { |
1095 | prealloc = alloc_extent_state_atomic(prealloc); | |
1cf4ffdb LB |
1096 | if (!prealloc) { |
1097 | err = -ENOMEM; | |
1098 | goto out; | |
1099 | } | |
12cfbad9 FDBM |
1100 | err = insert_state(tree, prealloc, start, end, |
1101 | &p, &parent, &bits); | |
c2d904e0 JM |
1102 | if (err) |
1103 | extent_io_tree_panic(tree, err); | |
c42ac0bc FDBM |
1104 | cache_state(prealloc, cached_state); |
1105 | prealloc = NULL; | |
462d6fac JB |
1106 | goto out; |
1107 | } | |
1108 | state = rb_entry(node, struct extent_state, rb_node); | |
1109 | hit_next: | |
1110 | last_start = state->start; | |
1111 | last_end = state->end; | |
1112 | ||
1113 | /* | |
1114 | * | ---- desired range ---- | | |
1115 | * | state | | |
1116 | * | |
1117 | * Just lock what we found and keep going | |
1118 | */ | |
1119 | if (state->start == start && state->end <= end) { | |
462d6fac | 1120 | set_state_bits(tree, state, &bits); |
e6138876 | 1121 | cache_state(state, cached_state); |
d1ac6e41 | 1122 | state = clear_state_bit(tree, state, &clear_bits, 0); |
462d6fac JB |
1123 | if (last_end == (u64)-1) |
1124 | goto out; | |
462d6fac | 1125 | start = last_end + 1; |
d1ac6e41 LB |
1126 | if (start < end && state && state->start == start && |
1127 | !need_resched()) | |
1128 | goto hit_next; | |
462d6fac JB |
1129 | goto search_again; |
1130 | } | |
1131 | ||
1132 | /* | |
1133 | * | ---- desired range ---- | | |
1134 | * | state | | |
1135 | * or | |
1136 | * | ------------- state -------------- | | |
1137 | * | |
1138 | * We need to split the extent we found, and may flip bits on | |
1139 | * second half. | |
1140 | * | |
1141 | * If the extent we found extends past our | |
1142 | * range, we just split and search again. It'll get split | |
1143 | * again the next time though. | |
1144 | * | |
1145 | * If the extent we found is inside our range, we set the | |
1146 | * desired bit on it. | |
1147 | */ | |
1148 | if (state->start < start) { | |
1149 | prealloc = alloc_extent_state_atomic(prealloc); | |
1cf4ffdb LB |
1150 | if (!prealloc) { |
1151 | err = -ENOMEM; | |
1152 | goto out; | |
1153 | } | |
462d6fac | 1154 | err = split_state(tree, state, prealloc, start); |
c2d904e0 JM |
1155 | if (err) |
1156 | extent_io_tree_panic(tree, err); | |
462d6fac JB |
1157 | prealloc = NULL; |
1158 | if (err) | |
1159 | goto out; | |
1160 | if (state->end <= end) { | |
1161 | set_state_bits(tree, state, &bits); | |
e6138876 | 1162 | cache_state(state, cached_state); |
d1ac6e41 | 1163 | state = clear_state_bit(tree, state, &clear_bits, 0); |
462d6fac JB |
1164 | if (last_end == (u64)-1) |
1165 | goto out; | |
1166 | start = last_end + 1; | |
d1ac6e41 LB |
1167 | if (start < end && state && state->start == start && |
1168 | !need_resched()) | |
1169 | goto hit_next; | |
462d6fac JB |
1170 | } |
1171 | goto search_again; | |
1172 | } | |
1173 | /* | |
1174 | * | ---- desired range ---- | | |
1175 | * | state | or | state | | |
1176 | * | |
1177 | * There's a hole, we need to insert something in it and | |
1178 | * ignore the extent we found. | |
1179 | */ | |
1180 | if (state->start > start) { | |
1181 | u64 this_end; | |
1182 | if (end < last_start) | |
1183 | this_end = end; | |
1184 | else | |
1185 | this_end = last_start - 1; | |
1186 | ||
1187 | prealloc = alloc_extent_state_atomic(prealloc); | |
1cf4ffdb LB |
1188 | if (!prealloc) { |
1189 | err = -ENOMEM; | |
1190 | goto out; | |
1191 | } | |
462d6fac JB |
1192 | |
1193 | /* | |
1194 | * Avoid to free 'prealloc' if it can be merged with | |
1195 | * the later extent. | |
1196 | */ | |
1197 | err = insert_state(tree, prealloc, start, this_end, | |
12cfbad9 | 1198 | NULL, NULL, &bits); |
c2d904e0 JM |
1199 | if (err) |
1200 | extent_io_tree_panic(tree, err); | |
e6138876 | 1201 | cache_state(prealloc, cached_state); |
462d6fac JB |
1202 | prealloc = NULL; |
1203 | start = this_end + 1; | |
1204 | goto search_again; | |
1205 | } | |
1206 | /* | |
1207 | * | ---- desired range ---- | | |
1208 | * | state | | |
1209 | * We need to split the extent, and set the bit | |
1210 | * on the first half | |
1211 | */ | |
1212 | if (state->start <= end && state->end > end) { | |
1213 | prealloc = alloc_extent_state_atomic(prealloc); | |
1cf4ffdb LB |
1214 | if (!prealloc) { |
1215 | err = -ENOMEM; | |
1216 | goto out; | |
1217 | } | |
462d6fac JB |
1218 | |
1219 | err = split_state(tree, state, prealloc, end + 1); | |
c2d904e0 JM |
1220 | if (err) |
1221 | extent_io_tree_panic(tree, err); | |
462d6fac JB |
1222 | |
1223 | set_state_bits(tree, prealloc, &bits); | |
e6138876 | 1224 | cache_state(prealloc, cached_state); |
462d6fac | 1225 | clear_state_bit(tree, prealloc, &clear_bits, 0); |
462d6fac JB |
1226 | prealloc = NULL; |
1227 | goto out; | |
1228 | } | |
1229 | ||
1230 | goto search_again; | |
1231 | ||
1232 | out: | |
1233 | spin_unlock(&tree->lock); | |
1234 | if (prealloc) | |
1235 | free_extent_state(prealloc); | |
1236 | ||
1237 | return err; | |
1238 | ||
1239 | search_again: | |
1240 | if (start > end) | |
1241 | goto out; | |
1242 | spin_unlock(&tree->lock); | |
1243 | if (mask & __GFP_WAIT) | |
1244 | cond_resched(); | |
1245 | goto again; | |
1246 | } | |
1247 | ||
d1310b2e CM |
1248 | /* wrappers around set/clear extent bit */ |
1249 | int set_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end, | |
1250 | gfp_t mask) | |
1251 | { | |
3fbe5c02 | 1252 | return set_extent_bit(tree, start, end, EXTENT_DIRTY, NULL, |
2c64c53d | 1253 | NULL, mask); |
d1310b2e | 1254 | } |
d1310b2e CM |
1255 | |
1256 | int set_extent_bits(struct extent_io_tree *tree, u64 start, u64 end, | |
41074888 | 1257 | unsigned long bits, gfp_t mask) |
d1310b2e | 1258 | { |
3fbe5c02 | 1259 | return set_extent_bit(tree, start, end, bits, NULL, |
2c64c53d | 1260 | NULL, mask); |
d1310b2e | 1261 | } |
d1310b2e CM |
1262 | |
1263 | int clear_extent_bits(struct extent_io_tree *tree, u64 start, u64 end, | |
41074888 | 1264 | unsigned long bits, gfp_t mask) |
d1310b2e | 1265 | { |
2c64c53d | 1266 | return clear_extent_bit(tree, start, end, bits, 0, 0, NULL, mask); |
d1310b2e | 1267 | } |
d1310b2e CM |
1268 | |
1269 | int set_extent_delalloc(struct extent_io_tree *tree, u64 start, u64 end, | |
2ac55d41 | 1270 | struct extent_state **cached_state, gfp_t mask) |
d1310b2e CM |
1271 | { |
1272 | return set_extent_bit(tree, start, end, | |
fee187d9 | 1273 | EXTENT_DELALLOC | EXTENT_UPTODATE, |
3fbe5c02 | 1274 | NULL, cached_state, mask); |
d1310b2e | 1275 | } |
d1310b2e | 1276 | |
9e8a4a8b LB |
1277 | int set_extent_defrag(struct extent_io_tree *tree, u64 start, u64 end, |
1278 | struct extent_state **cached_state, gfp_t mask) | |
1279 | { | |
1280 | return set_extent_bit(tree, start, end, | |
1281 | EXTENT_DELALLOC | EXTENT_UPTODATE | EXTENT_DEFRAG, | |
1282 | NULL, cached_state, mask); | |
1283 | } | |
1284 | ||
d1310b2e CM |
1285 | int clear_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end, |
1286 | gfp_t mask) | |
1287 | { | |
1288 | return clear_extent_bit(tree, start, end, | |
32c00aff | 1289 | EXTENT_DIRTY | EXTENT_DELALLOC | |
0ca1f7ce | 1290 | EXTENT_DO_ACCOUNTING, 0, 0, NULL, mask); |
d1310b2e | 1291 | } |
d1310b2e CM |
1292 | |
1293 | int set_extent_new(struct extent_io_tree *tree, u64 start, u64 end, | |
1294 | gfp_t mask) | |
1295 | { | |
3fbe5c02 | 1296 | return set_extent_bit(tree, start, end, EXTENT_NEW, NULL, |
2c64c53d | 1297 | NULL, mask); |
d1310b2e | 1298 | } |
d1310b2e | 1299 | |
d1310b2e | 1300 | int set_extent_uptodate(struct extent_io_tree *tree, u64 start, u64 end, |
507903b8 | 1301 | struct extent_state **cached_state, gfp_t mask) |
d1310b2e | 1302 | { |
6b67a320 | 1303 | return set_extent_bit(tree, start, end, EXTENT_UPTODATE, NULL, |
3fbe5c02 | 1304 | cached_state, mask); |
d1310b2e | 1305 | } |
d1310b2e | 1306 | |
5fd02043 JB |
1307 | int clear_extent_uptodate(struct extent_io_tree *tree, u64 start, u64 end, |
1308 | struct extent_state **cached_state, gfp_t mask) | |
d1310b2e | 1309 | { |
2c64c53d | 1310 | return clear_extent_bit(tree, start, end, EXTENT_UPTODATE, 0, 0, |
2ac55d41 | 1311 | cached_state, mask); |
d1310b2e | 1312 | } |
d1310b2e | 1313 | |
d352ac68 CM |
1314 | /* |
1315 | * either insert or lock state struct between start and end use mask to tell | |
1316 | * us if waiting is desired. | |
1317 | */ | |
1edbb734 | 1318 | int lock_extent_bits(struct extent_io_tree *tree, u64 start, u64 end, |
41074888 | 1319 | unsigned long bits, struct extent_state **cached_state) |
d1310b2e CM |
1320 | { |
1321 | int err; | |
1322 | u64 failed_start; | |
1323 | while (1) { | |
3fbe5c02 JM |
1324 | err = __set_extent_bit(tree, start, end, EXTENT_LOCKED | bits, |
1325 | EXTENT_LOCKED, &failed_start, | |
1326 | cached_state, GFP_NOFS); | |
d0082371 | 1327 | if (err == -EEXIST) { |
d1310b2e CM |
1328 | wait_extent_bit(tree, failed_start, end, EXTENT_LOCKED); |
1329 | start = failed_start; | |
d0082371 | 1330 | } else |
d1310b2e | 1331 | break; |
d1310b2e CM |
1332 | WARN_ON(start > end); |
1333 | } | |
1334 | return err; | |
1335 | } | |
d1310b2e | 1336 | |
d0082371 | 1337 | int lock_extent(struct extent_io_tree *tree, u64 start, u64 end) |
1edbb734 | 1338 | { |
d0082371 | 1339 | return lock_extent_bits(tree, start, end, 0, NULL); |
1edbb734 CM |
1340 | } |
1341 | ||
d0082371 | 1342 | int try_lock_extent(struct extent_io_tree *tree, u64 start, u64 end) |
25179201 JB |
1343 | { |
1344 | int err; | |
1345 | u64 failed_start; | |
1346 | ||
3fbe5c02 JM |
1347 | err = __set_extent_bit(tree, start, end, EXTENT_LOCKED, EXTENT_LOCKED, |
1348 | &failed_start, NULL, GFP_NOFS); | |
6643558d YZ |
1349 | if (err == -EEXIST) { |
1350 | if (failed_start > start) | |
1351 | clear_extent_bit(tree, start, failed_start - 1, | |
d0082371 | 1352 | EXTENT_LOCKED, 1, 0, NULL, GFP_NOFS); |
25179201 | 1353 | return 0; |
6643558d | 1354 | } |
25179201 JB |
1355 | return 1; |
1356 | } | |
25179201 | 1357 | |
2c64c53d CM |
1358 | int unlock_extent_cached(struct extent_io_tree *tree, u64 start, u64 end, |
1359 | struct extent_state **cached, gfp_t mask) | |
1360 | { | |
1361 | return clear_extent_bit(tree, start, end, EXTENT_LOCKED, 1, 0, cached, | |
1362 | mask); | |
1363 | } | |
1364 | ||
d0082371 | 1365 | int unlock_extent(struct extent_io_tree *tree, u64 start, u64 end) |
d1310b2e | 1366 | { |
2c64c53d | 1367 | return clear_extent_bit(tree, start, end, EXTENT_LOCKED, 1, 0, NULL, |
d0082371 | 1368 | GFP_NOFS); |
d1310b2e | 1369 | } |
d1310b2e | 1370 | |
4adaa611 CM |
1371 | int extent_range_clear_dirty_for_io(struct inode *inode, u64 start, u64 end) |
1372 | { | |
1373 | unsigned long index = start >> PAGE_CACHE_SHIFT; | |
1374 | unsigned long end_index = end >> PAGE_CACHE_SHIFT; | |
1375 | struct page *page; | |
1376 | ||
1377 | while (index <= end_index) { | |
1378 | page = find_get_page(inode->i_mapping, index); | |
1379 | BUG_ON(!page); /* Pages should be in the extent_io_tree */ | |
1380 | clear_page_dirty_for_io(page); | |
1381 | page_cache_release(page); | |
1382 | index++; | |
1383 | } | |
1384 | return 0; | |
1385 | } | |
1386 | ||
1387 | int extent_range_redirty_for_io(struct inode *inode, u64 start, u64 end) | |
1388 | { | |
1389 | unsigned long index = start >> PAGE_CACHE_SHIFT; | |
1390 | unsigned long end_index = end >> PAGE_CACHE_SHIFT; | |
1391 | struct page *page; | |
1392 | ||
1393 | while (index <= end_index) { | |
1394 | page = find_get_page(inode->i_mapping, index); | |
1395 | BUG_ON(!page); /* Pages should be in the extent_io_tree */ | |
1396 | account_page_redirty(page); | |
1397 | __set_page_dirty_nobuffers(page); | |
1398 | page_cache_release(page); | |
1399 | index++; | |
1400 | } | |
1401 | return 0; | |
1402 | } | |
1403 | ||
d1310b2e CM |
1404 | /* |
1405 | * helper function to set both pages and extents in the tree writeback | |
1406 | */ | |
b2950863 | 1407 | static int set_range_writeback(struct extent_io_tree *tree, u64 start, u64 end) |
d1310b2e CM |
1408 | { |
1409 | unsigned long index = start >> PAGE_CACHE_SHIFT; | |
1410 | unsigned long end_index = end >> PAGE_CACHE_SHIFT; | |
1411 | struct page *page; | |
1412 | ||
1413 | while (index <= end_index) { | |
1414 | page = find_get_page(tree->mapping, index); | |
79787eaa | 1415 | BUG_ON(!page); /* Pages should be in the extent_io_tree */ |
d1310b2e CM |
1416 | set_page_writeback(page); |
1417 | page_cache_release(page); | |
1418 | index++; | |
1419 | } | |
d1310b2e CM |
1420 | return 0; |
1421 | } | |
d1310b2e | 1422 | |
d352ac68 CM |
1423 | /* find the first state struct with 'bits' set after 'start', and |
1424 | * return it. tree->lock must be held. NULL will returned if | |
1425 | * nothing was found after 'start' | |
1426 | */ | |
48a3b636 ES |
1427 | static struct extent_state * |
1428 | find_first_extent_bit_state(struct extent_io_tree *tree, | |
41074888 | 1429 | u64 start, unsigned long bits) |
d7fc640e CM |
1430 | { |
1431 | struct rb_node *node; | |
1432 | struct extent_state *state; | |
1433 | ||
1434 | /* | |
1435 | * this search will find all the extents that end after | |
1436 | * our range starts. | |
1437 | */ | |
1438 | node = tree_search(tree, start); | |
d397712b | 1439 | if (!node) |
d7fc640e | 1440 | goto out; |
d7fc640e | 1441 | |
d397712b | 1442 | while (1) { |
d7fc640e | 1443 | state = rb_entry(node, struct extent_state, rb_node); |
d397712b | 1444 | if (state->end >= start && (state->state & bits)) |
d7fc640e | 1445 | return state; |
d397712b | 1446 | |
d7fc640e CM |
1447 | node = rb_next(node); |
1448 | if (!node) | |
1449 | break; | |
1450 | } | |
1451 | out: | |
1452 | return NULL; | |
1453 | } | |
d7fc640e | 1454 | |
69261c4b XG |
1455 | /* |
1456 | * find the first offset in the io tree with 'bits' set. zero is | |
1457 | * returned if we find something, and *start_ret and *end_ret are | |
1458 | * set to reflect the state struct that was found. | |
1459 | * | |
477d7eaf | 1460 | * If nothing was found, 1 is returned. If found something, return 0. |
69261c4b XG |
1461 | */ |
1462 | int find_first_extent_bit(struct extent_io_tree *tree, u64 start, | |
41074888 | 1463 | u64 *start_ret, u64 *end_ret, unsigned long bits, |
e6138876 | 1464 | struct extent_state **cached_state) |
69261c4b XG |
1465 | { |
1466 | struct extent_state *state; | |
e6138876 | 1467 | struct rb_node *n; |
69261c4b XG |
1468 | int ret = 1; |
1469 | ||
1470 | spin_lock(&tree->lock); | |
e6138876 JB |
1471 | if (cached_state && *cached_state) { |
1472 | state = *cached_state; | |
27a3507d | 1473 | if (state->end == start - 1 && extent_state_in_tree(state)) { |
e6138876 JB |
1474 | n = rb_next(&state->rb_node); |
1475 | while (n) { | |
1476 | state = rb_entry(n, struct extent_state, | |
1477 | rb_node); | |
1478 | if (state->state & bits) | |
1479 | goto got_it; | |
1480 | n = rb_next(n); | |
1481 | } | |
1482 | free_extent_state(*cached_state); | |
1483 | *cached_state = NULL; | |
1484 | goto out; | |
1485 | } | |
1486 | free_extent_state(*cached_state); | |
1487 | *cached_state = NULL; | |
1488 | } | |
1489 | ||
69261c4b | 1490 | state = find_first_extent_bit_state(tree, start, bits); |
e6138876 | 1491 | got_it: |
69261c4b | 1492 | if (state) { |
e38e2ed7 | 1493 | cache_state_if_flags(state, cached_state, 0); |
69261c4b XG |
1494 | *start_ret = state->start; |
1495 | *end_ret = state->end; | |
1496 | ret = 0; | |
1497 | } | |
e6138876 | 1498 | out: |
69261c4b XG |
1499 | spin_unlock(&tree->lock); |
1500 | return ret; | |
1501 | } | |
1502 | ||
d352ac68 CM |
1503 | /* |
1504 | * find a contiguous range of bytes in the file marked as delalloc, not | |
1505 | * more than 'max_bytes'. start and end are used to return the range, | |
1506 | * | |
1507 | * 1 is returned if we find something, 0 if nothing was in the tree | |
1508 | */ | |
c8b97818 | 1509 | static noinline u64 find_delalloc_range(struct extent_io_tree *tree, |
c2a128d2 JB |
1510 | u64 *start, u64 *end, u64 max_bytes, |
1511 | struct extent_state **cached_state) | |
d1310b2e CM |
1512 | { |
1513 | struct rb_node *node; | |
1514 | struct extent_state *state; | |
1515 | u64 cur_start = *start; | |
1516 | u64 found = 0; | |
1517 | u64 total_bytes = 0; | |
1518 | ||
cad321ad | 1519 | spin_lock(&tree->lock); |
c8b97818 | 1520 | |
d1310b2e CM |
1521 | /* |
1522 | * this search will find all the extents that end after | |
1523 | * our range starts. | |
1524 | */ | |
80ea96b1 | 1525 | node = tree_search(tree, cur_start); |
2b114d1d | 1526 | if (!node) { |
3b951516 CM |
1527 | if (!found) |
1528 | *end = (u64)-1; | |
d1310b2e CM |
1529 | goto out; |
1530 | } | |
1531 | ||
d397712b | 1532 | while (1) { |
d1310b2e | 1533 | state = rb_entry(node, struct extent_state, rb_node); |
5b21f2ed ZY |
1534 | if (found && (state->start != cur_start || |
1535 | (state->state & EXTENT_BOUNDARY))) { | |
d1310b2e CM |
1536 | goto out; |
1537 | } | |
1538 | if (!(state->state & EXTENT_DELALLOC)) { | |
1539 | if (!found) | |
1540 | *end = state->end; | |
1541 | goto out; | |
1542 | } | |
c2a128d2 | 1543 | if (!found) { |
d1310b2e | 1544 | *start = state->start; |
c2a128d2 JB |
1545 | *cached_state = state; |
1546 | atomic_inc(&state->refs); | |
1547 | } | |
d1310b2e CM |
1548 | found++; |
1549 | *end = state->end; | |
1550 | cur_start = state->end + 1; | |
1551 | node = rb_next(node); | |
d1310b2e | 1552 | total_bytes += state->end - state->start + 1; |
7bf811a5 | 1553 | if (total_bytes >= max_bytes) |
573aecaf | 1554 | break; |
573aecaf | 1555 | if (!node) |
d1310b2e CM |
1556 | break; |
1557 | } | |
1558 | out: | |
cad321ad | 1559 | spin_unlock(&tree->lock); |
d1310b2e CM |
1560 | return found; |
1561 | } | |
1562 | ||
143bede5 JM |
1563 | static noinline void __unlock_for_delalloc(struct inode *inode, |
1564 | struct page *locked_page, | |
1565 | u64 start, u64 end) | |
c8b97818 CM |
1566 | { |
1567 | int ret; | |
1568 | struct page *pages[16]; | |
1569 | unsigned long index = start >> PAGE_CACHE_SHIFT; | |
1570 | unsigned long end_index = end >> PAGE_CACHE_SHIFT; | |
1571 | unsigned long nr_pages = end_index - index + 1; | |
1572 | int i; | |
1573 | ||
1574 | if (index == locked_page->index && end_index == index) | |
143bede5 | 1575 | return; |
c8b97818 | 1576 | |
d397712b | 1577 | while (nr_pages > 0) { |
c8b97818 | 1578 | ret = find_get_pages_contig(inode->i_mapping, index, |
5b050f04 CM |
1579 | min_t(unsigned long, nr_pages, |
1580 | ARRAY_SIZE(pages)), pages); | |
c8b97818 CM |
1581 | for (i = 0; i < ret; i++) { |
1582 | if (pages[i] != locked_page) | |
1583 | unlock_page(pages[i]); | |
1584 | page_cache_release(pages[i]); | |
1585 | } | |
1586 | nr_pages -= ret; | |
1587 | index += ret; | |
1588 | cond_resched(); | |
1589 | } | |
c8b97818 CM |
1590 | } |
1591 | ||
1592 | static noinline int lock_delalloc_pages(struct inode *inode, | |
1593 | struct page *locked_page, | |
1594 | u64 delalloc_start, | |
1595 | u64 delalloc_end) | |
1596 | { | |
1597 | unsigned long index = delalloc_start >> PAGE_CACHE_SHIFT; | |
1598 | unsigned long start_index = index; | |
1599 | unsigned long end_index = delalloc_end >> PAGE_CACHE_SHIFT; | |
1600 | unsigned long pages_locked = 0; | |
1601 | struct page *pages[16]; | |
1602 | unsigned long nrpages; | |
1603 | int ret; | |
1604 | int i; | |
1605 | ||
1606 | /* the caller is responsible for locking the start index */ | |
1607 | if (index == locked_page->index && index == end_index) | |
1608 | return 0; | |
1609 | ||
1610 | /* skip the page at the start index */ | |
1611 | nrpages = end_index - index + 1; | |
d397712b | 1612 | while (nrpages > 0) { |
c8b97818 | 1613 | ret = find_get_pages_contig(inode->i_mapping, index, |
5b050f04 CM |
1614 | min_t(unsigned long, |
1615 | nrpages, ARRAY_SIZE(pages)), pages); | |
c8b97818 CM |
1616 | if (ret == 0) { |
1617 | ret = -EAGAIN; | |
1618 | goto done; | |
1619 | } | |
1620 | /* now we have an array of pages, lock them all */ | |
1621 | for (i = 0; i < ret; i++) { | |
1622 | /* | |
1623 | * the caller is taking responsibility for | |
1624 | * locked_page | |
1625 | */ | |
771ed689 | 1626 | if (pages[i] != locked_page) { |
c8b97818 | 1627 | lock_page(pages[i]); |
f2b1c41c CM |
1628 | if (!PageDirty(pages[i]) || |
1629 | pages[i]->mapping != inode->i_mapping) { | |
771ed689 CM |
1630 | ret = -EAGAIN; |
1631 | unlock_page(pages[i]); | |
1632 | page_cache_release(pages[i]); | |
1633 | goto done; | |
1634 | } | |
1635 | } | |
c8b97818 | 1636 | page_cache_release(pages[i]); |
771ed689 | 1637 | pages_locked++; |
c8b97818 | 1638 | } |
c8b97818 CM |
1639 | nrpages -= ret; |
1640 | index += ret; | |
1641 | cond_resched(); | |
1642 | } | |
1643 | ret = 0; | |
1644 | done: | |
1645 | if (ret && pages_locked) { | |
1646 | __unlock_for_delalloc(inode, locked_page, | |
1647 | delalloc_start, | |
1648 | ((u64)(start_index + pages_locked - 1)) << | |
1649 | PAGE_CACHE_SHIFT); | |
1650 | } | |
1651 | return ret; | |
1652 | } | |
1653 | ||
1654 | /* | |
1655 | * find a contiguous range of bytes in the file marked as delalloc, not | |
1656 | * more than 'max_bytes'. start and end are used to return the range, | |
1657 | * | |
1658 | * 1 is returned if we find something, 0 if nothing was in the tree | |
1659 | */ | |
294e30fe JB |
1660 | STATIC u64 find_lock_delalloc_range(struct inode *inode, |
1661 | struct extent_io_tree *tree, | |
1662 | struct page *locked_page, u64 *start, | |
1663 | u64 *end, u64 max_bytes) | |
c8b97818 CM |
1664 | { |
1665 | u64 delalloc_start; | |
1666 | u64 delalloc_end; | |
1667 | u64 found; | |
9655d298 | 1668 | struct extent_state *cached_state = NULL; |
c8b97818 CM |
1669 | int ret; |
1670 | int loops = 0; | |
1671 | ||
1672 | again: | |
1673 | /* step one, find a bunch of delalloc bytes starting at start */ | |
1674 | delalloc_start = *start; | |
1675 | delalloc_end = 0; | |
1676 | found = find_delalloc_range(tree, &delalloc_start, &delalloc_end, | |
c2a128d2 | 1677 | max_bytes, &cached_state); |
70b99e69 | 1678 | if (!found || delalloc_end <= *start) { |
c8b97818 CM |
1679 | *start = delalloc_start; |
1680 | *end = delalloc_end; | |
c2a128d2 | 1681 | free_extent_state(cached_state); |
385fe0be | 1682 | return 0; |
c8b97818 CM |
1683 | } |
1684 | ||
70b99e69 CM |
1685 | /* |
1686 | * start comes from the offset of locked_page. We have to lock | |
1687 | * pages in order, so we can't process delalloc bytes before | |
1688 | * locked_page | |
1689 | */ | |
d397712b | 1690 | if (delalloc_start < *start) |
70b99e69 | 1691 | delalloc_start = *start; |
70b99e69 | 1692 | |
c8b97818 CM |
1693 | /* |
1694 | * make sure to limit the number of pages we try to lock down | |
c8b97818 | 1695 | */ |
7bf811a5 JB |
1696 | if (delalloc_end + 1 - delalloc_start > max_bytes) |
1697 | delalloc_end = delalloc_start + max_bytes - 1; | |
d397712b | 1698 | |
c8b97818 CM |
1699 | /* step two, lock all the pages after the page that has start */ |
1700 | ret = lock_delalloc_pages(inode, locked_page, | |
1701 | delalloc_start, delalloc_end); | |
1702 | if (ret == -EAGAIN) { | |
1703 | /* some of the pages are gone, lets avoid looping by | |
1704 | * shortening the size of the delalloc range we're searching | |
1705 | */ | |
9655d298 | 1706 | free_extent_state(cached_state); |
7d788742 | 1707 | cached_state = NULL; |
c8b97818 | 1708 | if (!loops) { |
7bf811a5 | 1709 | max_bytes = PAGE_CACHE_SIZE; |
c8b97818 CM |
1710 | loops = 1; |
1711 | goto again; | |
1712 | } else { | |
1713 | found = 0; | |
1714 | goto out_failed; | |
1715 | } | |
1716 | } | |
79787eaa | 1717 | BUG_ON(ret); /* Only valid values are 0 and -EAGAIN */ |
c8b97818 CM |
1718 | |
1719 | /* step three, lock the state bits for the whole range */ | |
d0082371 | 1720 | lock_extent_bits(tree, delalloc_start, delalloc_end, 0, &cached_state); |
c8b97818 CM |
1721 | |
1722 | /* then test to make sure it is all still delalloc */ | |
1723 | ret = test_range_bit(tree, delalloc_start, delalloc_end, | |
9655d298 | 1724 | EXTENT_DELALLOC, 1, cached_state); |
c8b97818 | 1725 | if (!ret) { |
9655d298 CM |
1726 | unlock_extent_cached(tree, delalloc_start, delalloc_end, |
1727 | &cached_state, GFP_NOFS); | |
c8b97818 CM |
1728 | __unlock_for_delalloc(inode, locked_page, |
1729 | delalloc_start, delalloc_end); | |
1730 | cond_resched(); | |
1731 | goto again; | |
1732 | } | |
9655d298 | 1733 | free_extent_state(cached_state); |
c8b97818 CM |
1734 | *start = delalloc_start; |
1735 | *end = delalloc_end; | |
1736 | out_failed: | |
1737 | return found; | |
1738 | } | |
1739 | ||
c2790a2e JB |
1740 | int extent_clear_unlock_delalloc(struct inode *inode, u64 start, u64 end, |
1741 | struct page *locked_page, | |
1742 | unsigned long clear_bits, | |
1743 | unsigned long page_ops) | |
c8b97818 | 1744 | { |
c2790a2e | 1745 | struct extent_io_tree *tree = &BTRFS_I(inode)->io_tree; |
c8b97818 CM |
1746 | int ret; |
1747 | struct page *pages[16]; | |
1748 | unsigned long index = start >> PAGE_CACHE_SHIFT; | |
1749 | unsigned long end_index = end >> PAGE_CACHE_SHIFT; | |
1750 | unsigned long nr_pages = end_index - index + 1; | |
1751 | int i; | |
771ed689 | 1752 | |
2c64c53d | 1753 | clear_extent_bit(tree, start, end, clear_bits, 1, 0, NULL, GFP_NOFS); |
c2790a2e | 1754 | if (page_ops == 0) |
771ed689 | 1755 | return 0; |
c8b97818 | 1756 | |
704de49d FM |
1757 | if ((page_ops & PAGE_SET_ERROR) && nr_pages > 0) |
1758 | mapping_set_error(inode->i_mapping, -EIO); | |
1759 | ||
d397712b | 1760 | while (nr_pages > 0) { |
c8b97818 | 1761 | ret = find_get_pages_contig(inode->i_mapping, index, |
5b050f04 CM |
1762 | min_t(unsigned long, |
1763 | nr_pages, ARRAY_SIZE(pages)), pages); | |
c8b97818 | 1764 | for (i = 0; i < ret; i++) { |
8b62b72b | 1765 | |
c2790a2e | 1766 | if (page_ops & PAGE_SET_PRIVATE2) |
8b62b72b CM |
1767 | SetPagePrivate2(pages[i]); |
1768 | ||
c8b97818 CM |
1769 | if (pages[i] == locked_page) { |
1770 | page_cache_release(pages[i]); | |
1771 | continue; | |
1772 | } | |
c2790a2e | 1773 | if (page_ops & PAGE_CLEAR_DIRTY) |
c8b97818 | 1774 | clear_page_dirty_for_io(pages[i]); |
c2790a2e | 1775 | if (page_ops & PAGE_SET_WRITEBACK) |
c8b97818 | 1776 | set_page_writeback(pages[i]); |
704de49d FM |
1777 | if (page_ops & PAGE_SET_ERROR) |
1778 | SetPageError(pages[i]); | |
c2790a2e | 1779 | if (page_ops & PAGE_END_WRITEBACK) |
c8b97818 | 1780 | end_page_writeback(pages[i]); |
c2790a2e | 1781 | if (page_ops & PAGE_UNLOCK) |
771ed689 | 1782 | unlock_page(pages[i]); |
c8b97818 CM |
1783 | page_cache_release(pages[i]); |
1784 | } | |
1785 | nr_pages -= ret; | |
1786 | index += ret; | |
1787 | cond_resched(); | |
1788 | } | |
1789 | return 0; | |
1790 | } | |
c8b97818 | 1791 | |
d352ac68 CM |
1792 | /* |
1793 | * count the number of bytes in the tree that have a given bit(s) | |
1794 | * set. This can be fairly slow, except for EXTENT_DIRTY which is | |
1795 | * cached. The total number found is returned. | |
1796 | */ | |
d1310b2e CM |
1797 | u64 count_range_bits(struct extent_io_tree *tree, |
1798 | u64 *start, u64 search_end, u64 max_bytes, | |
ec29ed5b | 1799 | unsigned long bits, int contig) |
d1310b2e CM |
1800 | { |
1801 | struct rb_node *node; | |
1802 | struct extent_state *state; | |
1803 | u64 cur_start = *start; | |
1804 | u64 total_bytes = 0; | |
ec29ed5b | 1805 | u64 last = 0; |
d1310b2e CM |
1806 | int found = 0; |
1807 | ||
fae7f21c | 1808 | if (WARN_ON(search_end <= cur_start)) |
d1310b2e | 1809 | return 0; |
d1310b2e | 1810 | |
cad321ad | 1811 | spin_lock(&tree->lock); |
d1310b2e CM |
1812 | if (cur_start == 0 && bits == EXTENT_DIRTY) { |
1813 | total_bytes = tree->dirty_bytes; | |
1814 | goto out; | |
1815 | } | |
1816 | /* | |
1817 | * this search will find all the extents that end after | |
1818 | * our range starts. | |
1819 | */ | |
80ea96b1 | 1820 | node = tree_search(tree, cur_start); |
d397712b | 1821 | if (!node) |
d1310b2e | 1822 | goto out; |
d1310b2e | 1823 | |
d397712b | 1824 | while (1) { |
d1310b2e CM |
1825 | state = rb_entry(node, struct extent_state, rb_node); |
1826 | if (state->start > search_end) | |
1827 | break; | |
ec29ed5b CM |
1828 | if (contig && found && state->start > last + 1) |
1829 | break; | |
1830 | if (state->end >= cur_start && (state->state & bits) == bits) { | |
d1310b2e CM |
1831 | total_bytes += min(search_end, state->end) + 1 - |
1832 | max(cur_start, state->start); | |
1833 | if (total_bytes >= max_bytes) | |
1834 | break; | |
1835 | if (!found) { | |
af60bed2 | 1836 | *start = max(cur_start, state->start); |
d1310b2e CM |
1837 | found = 1; |
1838 | } | |
ec29ed5b CM |
1839 | last = state->end; |
1840 | } else if (contig && found) { | |
1841 | break; | |
d1310b2e CM |
1842 | } |
1843 | node = rb_next(node); | |
1844 | if (!node) | |
1845 | break; | |
1846 | } | |
1847 | out: | |
cad321ad | 1848 | spin_unlock(&tree->lock); |
d1310b2e CM |
1849 | return total_bytes; |
1850 | } | |
b2950863 | 1851 | |
d352ac68 CM |
1852 | /* |
1853 | * set the private field for a given byte offset in the tree. If there isn't | |
1854 | * an extent_state there already, this does nothing. | |
1855 | */ | |
171170c1 | 1856 | static int set_state_private(struct extent_io_tree *tree, u64 start, u64 private) |
d1310b2e CM |
1857 | { |
1858 | struct rb_node *node; | |
1859 | struct extent_state *state; | |
1860 | int ret = 0; | |
1861 | ||
cad321ad | 1862 | spin_lock(&tree->lock); |
d1310b2e CM |
1863 | /* |
1864 | * this search will find all the extents that end after | |
1865 | * our range starts. | |
1866 | */ | |
80ea96b1 | 1867 | node = tree_search(tree, start); |
2b114d1d | 1868 | if (!node) { |
d1310b2e CM |
1869 | ret = -ENOENT; |
1870 | goto out; | |
1871 | } | |
1872 | state = rb_entry(node, struct extent_state, rb_node); | |
1873 | if (state->start != start) { | |
1874 | ret = -ENOENT; | |
1875 | goto out; | |
1876 | } | |
1877 | state->private = private; | |
1878 | out: | |
cad321ad | 1879 | spin_unlock(&tree->lock); |
d1310b2e CM |
1880 | return ret; |
1881 | } | |
1882 | ||
1883 | int get_state_private(struct extent_io_tree *tree, u64 start, u64 *private) | |
1884 | { | |
1885 | struct rb_node *node; | |
1886 | struct extent_state *state; | |
1887 | int ret = 0; | |
1888 | ||
cad321ad | 1889 | spin_lock(&tree->lock); |
d1310b2e CM |
1890 | /* |
1891 | * this search will find all the extents that end after | |
1892 | * our range starts. | |
1893 | */ | |
80ea96b1 | 1894 | node = tree_search(tree, start); |
2b114d1d | 1895 | if (!node) { |
d1310b2e CM |
1896 | ret = -ENOENT; |
1897 | goto out; | |
1898 | } | |
1899 | state = rb_entry(node, struct extent_state, rb_node); | |
1900 | if (state->start != start) { | |
1901 | ret = -ENOENT; | |
1902 | goto out; | |
1903 | } | |
1904 | *private = state->private; | |
1905 | out: | |
cad321ad | 1906 | spin_unlock(&tree->lock); |
d1310b2e CM |
1907 | return ret; |
1908 | } | |
1909 | ||
1910 | /* | |
1911 | * searches a range in the state tree for a given mask. | |
70dec807 | 1912 | * If 'filled' == 1, this returns 1 only if every extent in the tree |
d1310b2e CM |
1913 | * has the bits set. Otherwise, 1 is returned if any bit in the |
1914 | * range is found set. | |
1915 | */ | |
1916 | int test_range_bit(struct extent_io_tree *tree, u64 start, u64 end, | |
41074888 | 1917 | unsigned long bits, int filled, struct extent_state *cached) |
d1310b2e CM |
1918 | { |
1919 | struct extent_state *state = NULL; | |
1920 | struct rb_node *node; | |
1921 | int bitset = 0; | |
d1310b2e | 1922 | |
cad321ad | 1923 | spin_lock(&tree->lock); |
27a3507d | 1924 | if (cached && extent_state_in_tree(cached) && cached->start <= start && |
df98b6e2 | 1925 | cached->end > start) |
9655d298 CM |
1926 | node = &cached->rb_node; |
1927 | else | |
1928 | node = tree_search(tree, start); | |
d1310b2e CM |
1929 | while (node && start <= end) { |
1930 | state = rb_entry(node, struct extent_state, rb_node); | |
1931 | ||
1932 | if (filled && state->start > start) { | |
1933 | bitset = 0; | |
1934 | break; | |
1935 | } | |
1936 | ||
1937 | if (state->start > end) | |
1938 | break; | |
1939 | ||
1940 | if (state->state & bits) { | |
1941 | bitset = 1; | |
1942 | if (!filled) | |
1943 | break; | |
1944 | } else if (filled) { | |
1945 | bitset = 0; | |
1946 | break; | |
1947 | } | |
46562cec CM |
1948 | |
1949 | if (state->end == (u64)-1) | |
1950 | break; | |
1951 | ||
d1310b2e CM |
1952 | start = state->end + 1; |
1953 | if (start > end) | |
1954 | break; | |
1955 | node = rb_next(node); | |
1956 | if (!node) { | |
1957 | if (filled) | |
1958 | bitset = 0; | |
1959 | break; | |
1960 | } | |
1961 | } | |
cad321ad | 1962 | spin_unlock(&tree->lock); |
d1310b2e CM |
1963 | return bitset; |
1964 | } | |
d1310b2e CM |
1965 | |
1966 | /* | |
1967 | * helper function to set a given page up to date if all the | |
1968 | * extents in the tree for that page are up to date | |
1969 | */ | |
143bede5 | 1970 | static void check_page_uptodate(struct extent_io_tree *tree, struct page *page) |
d1310b2e | 1971 | { |
4eee4fa4 | 1972 | u64 start = page_offset(page); |
d1310b2e | 1973 | u64 end = start + PAGE_CACHE_SIZE - 1; |
9655d298 | 1974 | if (test_range_bit(tree, start, end, EXTENT_UPTODATE, 1, NULL)) |
d1310b2e | 1975 | SetPageUptodate(page); |
d1310b2e CM |
1976 | } |
1977 | ||
8b110e39 | 1978 | int free_io_failure(struct inode *inode, struct io_failure_record *rec) |
4a54c8c1 JS |
1979 | { |
1980 | int ret; | |
1981 | int err = 0; | |
1982 | struct extent_io_tree *failure_tree = &BTRFS_I(inode)->io_failure_tree; | |
1983 | ||
1984 | set_state_private(failure_tree, rec->start, 0); | |
1985 | ret = clear_extent_bits(failure_tree, rec->start, | |
1986 | rec->start + rec->len - 1, | |
1987 | EXTENT_LOCKED | EXTENT_DIRTY, GFP_NOFS); | |
1988 | if (ret) | |
1989 | err = ret; | |
1990 | ||
53b381b3 DW |
1991 | ret = clear_extent_bits(&BTRFS_I(inode)->io_tree, rec->start, |
1992 | rec->start + rec->len - 1, | |
1993 | EXTENT_DAMAGED, GFP_NOFS); | |
1994 | if (ret && !err) | |
1995 | err = ret; | |
4a54c8c1 JS |
1996 | |
1997 | kfree(rec); | |
1998 | return err; | |
1999 | } | |
2000 | ||
4a54c8c1 JS |
2001 | /* |
2002 | * this bypasses the standard btrfs submit functions deliberately, as | |
2003 | * the standard behavior is to write all copies in a raid setup. here we only | |
2004 | * want to write the one bad copy. so we do the mapping for ourselves and issue | |
2005 | * submit_bio directly. | |
3ec706c8 | 2006 | * to avoid any synchronization issues, wait for the data after writing, which |
4a54c8c1 JS |
2007 | * actually prevents the read that triggered the error from finishing. |
2008 | * currently, there can be no more than two copies of every data bit. thus, | |
2009 | * exactly one rewrite is required. | |
2010 | */ | |
1203b681 MX |
2011 | int repair_io_failure(struct inode *inode, u64 start, u64 length, u64 logical, |
2012 | struct page *page, unsigned int pg_offset, int mirror_num) | |
4a54c8c1 | 2013 | { |
1203b681 | 2014 | struct btrfs_fs_info *fs_info = BTRFS_I(inode)->root->fs_info; |
4a54c8c1 JS |
2015 | struct bio *bio; |
2016 | struct btrfs_device *dev; | |
4a54c8c1 JS |
2017 | u64 map_length = 0; |
2018 | u64 sector; | |
2019 | struct btrfs_bio *bbio = NULL; | |
53b381b3 | 2020 | struct btrfs_mapping_tree *map_tree = &fs_info->mapping_tree; |
4a54c8c1 JS |
2021 | int ret; |
2022 | ||
908960c6 | 2023 | ASSERT(!(fs_info->sb->s_flags & MS_RDONLY)); |
4a54c8c1 JS |
2024 | BUG_ON(!mirror_num); |
2025 | ||
53b381b3 DW |
2026 | /* we can't repair anything in raid56 yet */ |
2027 | if (btrfs_is_parity_mirror(map_tree, logical, length, mirror_num)) | |
2028 | return 0; | |
2029 | ||
9be3395b | 2030 | bio = btrfs_io_bio_alloc(GFP_NOFS, 1); |
4a54c8c1 JS |
2031 | if (!bio) |
2032 | return -EIO; | |
4f024f37 | 2033 | bio->bi_iter.bi_size = 0; |
4a54c8c1 JS |
2034 | map_length = length; |
2035 | ||
3ec706c8 | 2036 | ret = btrfs_map_block(fs_info, WRITE, logical, |
4a54c8c1 JS |
2037 | &map_length, &bbio, mirror_num); |
2038 | if (ret) { | |
2039 | bio_put(bio); | |
2040 | return -EIO; | |
2041 | } | |
2042 | BUG_ON(mirror_num != bbio->mirror_num); | |
2043 | sector = bbio->stripes[mirror_num-1].physical >> 9; | |
4f024f37 | 2044 | bio->bi_iter.bi_sector = sector; |
4a54c8c1 JS |
2045 | dev = bbio->stripes[mirror_num-1].dev; |
2046 | kfree(bbio); | |
2047 | if (!dev || !dev->bdev || !dev->writeable) { | |
2048 | bio_put(bio); | |
2049 | return -EIO; | |
2050 | } | |
2051 | bio->bi_bdev = dev->bdev; | |
ffdd2018 | 2052 | bio_add_page(bio, page, length, pg_offset); |
4a54c8c1 | 2053 | |
33879d45 | 2054 | if (btrfsic_submit_bio_wait(WRITE_SYNC, bio)) { |
4a54c8c1 JS |
2055 | /* try to remap that extent elsewhere? */ |
2056 | bio_put(bio); | |
442a4f63 | 2057 | btrfs_dev_stat_inc_and_print(dev, BTRFS_DEV_STAT_WRITE_ERRS); |
4a54c8c1 JS |
2058 | return -EIO; |
2059 | } | |
2060 | ||
efe120a0 | 2061 | printk_ratelimited_in_rcu(KERN_INFO |
1203b681 MX |
2062 | "BTRFS: read error corrected: ino %llu off %llu (dev %s sector %llu)\n", |
2063 | btrfs_ino(inode), start, | |
2064 | rcu_str_deref(dev->name), sector); | |
4a54c8c1 JS |
2065 | bio_put(bio); |
2066 | return 0; | |
2067 | } | |
2068 | ||
ea466794 JB |
2069 | int repair_eb_io_failure(struct btrfs_root *root, struct extent_buffer *eb, |
2070 | int mirror_num) | |
2071 | { | |
ea466794 JB |
2072 | u64 start = eb->start; |
2073 | unsigned long i, num_pages = num_extent_pages(eb->start, eb->len); | |
d95603b2 | 2074 | int ret = 0; |
ea466794 | 2075 | |
908960c6 ID |
2076 | if (root->fs_info->sb->s_flags & MS_RDONLY) |
2077 | return -EROFS; | |
2078 | ||
ea466794 | 2079 | for (i = 0; i < num_pages; i++) { |
fb85fc9a | 2080 | struct page *p = eb->pages[i]; |
1203b681 MX |
2081 | |
2082 | ret = repair_io_failure(root->fs_info->btree_inode, start, | |
2083 | PAGE_CACHE_SIZE, start, p, | |
2084 | start - page_offset(p), mirror_num); | |
ea466794 JB |
2085 | if (ret) |
2086 | break; | |
2087 | start += PAGE_CACHE_SIZE; | |
2088 | } | |
2089 | ||
2090 | return ret; | |
2091 | } | |
2092 | ||
4a54c8c1 JS |
2093 | /* |
2094 | * each time an IO finishes, we do a fast check in the IO failure tree | |
2095 | * to see if we need to process or clean up an io_failure_record | |
2096 | */ | |
8b110e39 MX |
2097 | int clean_io_failure(struct inode *inode, u64 start, struct page *page, |
2098 | unsigned int pg_offset) | |
4a54c8c1 JS |
2099 | { |
2100 | u64 private; | |
2101 | u64 private_failure; | |
2102 | struct io_failure_record *failrec; | |
908960c6 | 2103 | struct btrfs_fs_info *fs_info = BTRFS_I(inode)->root->fs_info; |
4a54c8c1 JS |
2104 | struct extent_state *state; |
2105 | int num_copies; | |
4a54c8c1 | 2106 | int ret; |
4a54c8c1 JS |
2107 | |
2108 | private = 0; | |
2109 | ret = count_range_bits(&BTRFS_I(inode)->io_failure_tree, &private, | |
2110 | (u64)-1, 1, EXTENT_DIRTY, 0); | |
2111 | if (!ret) | |
2112 | return 0; | |
2113 | ||
2114 | ret = get_state_private(&BTRFS_I(inode)->io_failure_tree, start, | |
2115 | &private_failure); | |
2116 | if (ret) | |
2117 | return 0; | |
2118 | ||
2119 | failrec = (struct io_failure_record *)(unsigned long) private_failure; | |
2120 | BUG_ON(!failrec->this_mirror); | |
2121 | ||
2122 | if (failrec->in_validation) { | |
2123 | /* there was no real error, just free the record */ | |
2124 | pr_debug("clean_io_failure: freeing dummy error at %llu\n", | |
2125 | failrec->start); | |
4a54c8c1 JS |
2126 | goto out; |
2127 | } | |
908960c6 ID |
2128 | if (fs_info->sb->s_flags & MS_RDONLY) |
2129 | goto out; | |
4a54c8c1 JS |
2130 | |
2131 | spin_lock(&BTRFS_I(inode)->io_tree.lock); | |
2132 | state = find_first_extent_bit_state(&BTRFS_I(inode)->io_tree, | |
2133 | failrec->start, | |
2134 | EXTENT_LOCKED); | |
2135 | spin_unlock(&BTRFS_I(inode)->io_tree.lock); | |
2136 | ||
883d0de4 MX |
2137 | if (state && state->start <= failrec->start && |
2138 | state->end >= failrec->start + failrec->len - 1) { | |
3ec706c8 SB |
2139 | num_copies = btrfs_num_copies(fs_info, failrec->logical, |
2140 | failrec->len); | |
4a54c8c1 | 2141 | if (num_copies > 1) { |
1203b681 | 2142 | repair_io_failure(inode, start, failrec->len, |
454ff3de | 2143 | failrec->logical, page, |
1203b681 | 2144 | pg_offset, failrec->failed_mirror); |
4a54c8c1 JS |
2145 | } |
2146 | } | |
2147 | ||
2148 | out: | |
454ff3de | 2149 | free_io_failure(inode, failrec); |
4a54c8c1 | 2150 | |
454ff3de | 2151 | return 0; |
4a54c8c1 JS |
2152 | } |
2153 | ||
f612496b MX |
2154 | /* |
2155 | * Can be called when | |
2156 | * - hold extent lock | |
2157 | * - under ordered extent | |
2158 | * - the inode is freeing | |
2159 | */ | |
2160 | void btrfs_free_io_failure_record(struct inode *inode, u64 start, u64 end) | |
2161 | { | |
2162 | struct extent_io_tree *failure_tree = &BTRFS_I(inode)->io_failure_tree; | |
2163 | struct io_failure_record *failrec; | |
2164 | struct extent_state *state, *next; | |
2165 | ||
2166 | if (RB_EMPTY_ROOT(&failure_tree->state)) | |
2167 | return; | |
2168 | ||
2169 | spin_lock(&failure_tree->lock); | |
2170 | state = find_first_extent_bit_state(failure_tree, start, EXTENT_DIRTY); | |
2171 | while (state) { | |
2172 | if (state->start > end) | |
2173 | break; | |
2174 | ||
2175 | ASSERT(state->end <= end); | |
2176 | ||
2177 | next = next_state(state); | |
2178 | ||
2179 | failrec = (struct io_failure_record *)state->private; | |
2180 | free_extent_state(state); | |
2181 | kfree(failrec); | |
2182 | ||
2183 | state = next; | |
2184 | } | |
2185 | spin_unlock(&failure_tree->lock); | |
2186 | } | |
2187 | ||
2fe6303e MX |
2188 | int btrfs_get_io_failure_record(struct inode *inode, u64 start, u64 end, |
2189 | struct io_failure_record **failrec_ret) | |
4a54c8c1 | 2190 | { |
2fe6303e | 2191 | struct io_failure_record *failrec; |
4a54c8c1 JS |
2192 | u64 private; |
2193 | struct extent_map *em; | |
4a54c8c1 JS |
2194 | struct extent_io_tree *failure_tree = &BTRFS_I(inode)->io_failure_tree; |
2195 | struct extent_io_tree *tree = &BTRFS_I(inode)->io_tree; | |
2196 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; | |
4a54c8c1 | 2197 | int ret; |
4a54c8c1 JS |
2198 | u64 logical; |
2199 | ||
4a54c8c1 JS |
2200 | ret = get_state_private(failure_tree, start, &private); |
2201 | if (ret) { | |
2202 | failrec = kzalloc(sizeof(*failrec), GFP_NOFS); | |
2203 | if (!failrec) | |
2204 | return -ENOMEM; | |
2fe6303e | 2205 | |
4a54c8c1 JS |
2206 | failrec->start = start; |
2207 | failrec->len = end - start + 1; | |
2208 | failrec->this_mirror = 0; | |
2209 | failrec->bio_flags = 0; | |
2210 | failrec->in_validation = 0; | |
2211 | ||
2212 | read_lock(&em_tree->lock); | |
2213 | em = lookup_extent_mapping(em_tree, start, failrec->len); | |
2214 | if (!em) { | |
2215 | read_unlock(&em_tree->lock); | |
2216 | kfree(failrec); | |
2217 | return -EIO; | |
2218 | } | |
2219 | ||
68ba990f | 2220 | if (em->start > start || em->start + em->len <= start) { |
4a54c8c1 JS |
2221 | free_extent_map(em); |
2222 | em = NULL; | |
2223 | } | |
2224 | read_unlock(&em_tree->lock); | |
7a2d6a64 | 2225 | if (!em) { |
4a54c8c1 JS |
2226 | kfree(failrec); |
2227 | return -EIO; | |
2228 | } | |
2fe6303e | 2229 | |
4a54c8c1 JS |
2230 | logical = start - em->start; |
2231 | logical = em->block_start + logical; | |
2232 | if (test_bit(EXTENT_FLAG_COMPRESSED, &em->flags)) { | |
2233 | logical = em->block_start; | |
2234 | failrec->bio_flags = EXTENT_BIO_COMPRESSED; | |
2235 | extent_set_compress_type(&failrec->bio_flags, | |
2236 | em->compress_type); | |
2237 | } | |
2fe6303e MX |
2238 | |
2239 | pr_debug("Get IO Failure Record: (new) logical=%llu, start=%llu, len=%llu\n", | |
2240 | logical, start, failrec->len); | |
2241 | ||
4a54c8c1 JS |
2242 | failrec->logical = logical; |
2243 | free_extent_map(em); | |
2244 | ||
2245 | /* set the bits in the private failure tree */ | |
2246 | ret = set_extent_bits(failure_tree, start, end, | |
2247 | EXTENT_LOCKED | EXTENT_DIRTY, GFP_NOFS); | |
2248 | if (ret >= 0) | |
2249 | ret = set_state_private(failure_tree, start, | |
2250 | (u64)(unsigned long)failrec); | |
2251 | /* set the bits in the inode's tree */ | |
2252 | if (ret >= 0) | |
2253 | ret = set_extent_bits(tree, start, end, EXTENT_DAMAGED, | |
2254 | GFP_NOFS); | |
2255 | if (ret < 0) { | |
2256 | kfree(failrec); | |
2257 | return ret; | |
2258 | } | |
2259 | } else { | |
2260 | failrec = (struct io_failure_record *)(unsigned long)private; | |
2fe6303e | 2261 | pr_debug("Get IO Failure Record: (found) logical=%llu, start=%llu, len=%llu, validation=%d\n", |
4a54c8c1 JS |
2262 | failrec->logical, failrec->start, failrec->len, |
2263 | failrec->in_validation); | |
2264 | /* | |
2265 | * when data can be on disk more than twice, add to failrec here | |
2266 | * (e.g. with a list for failed_mirror) to make | |
2267 | * clean_io_failure() clean all those errors at once. | |
2268 | */ | |
2269 | } | |
2fe6303e MX |
2270 | |
2271 | *failrec_ret = failrec; | |
2272 | ||
2273 | return 0; | |
2274 | } | |
2275 | ||
2276 | int btrfs_check_repairable(struct inode *inode, struct bio *failed_bio, | |
2277 | struct io_failure_record *failrec, int failed_mirror) | |
2278 | { | |
2279 | int num_copies; | |
2280 | ||
5d964051 SB |
2281 | num_copies = btrfs_num_copies(BTRFS_I(inode)->root->fs_info, |
2282 | failrec->logical, failrec->len); | |
4a54c8c1 JS |
2283 | if (num_copies == 1) { |
2284 | /* | |
2285 | * we only have a single copy of the data, so don't bother with | |
2286 | * all the retry and error correction code that follows. no | |
2287 | * matter what the error is, it is very likely to persist. | |
2288 | */ | |
2fe6303e | 2289 | pr_debug("Check Repairable: cannot repair, num_copies=%d, next_mirror %d, failed_mirror %d\n", |
09a7f7a2 | 2290 | num_copies, failrec->this_mirror, failed_mirror); |
2fe6303e | 2291 | return 0; |
4a54c8c1 JS |
2292 | } |
2293 | ||
4a54c8c1 JS |
2294 | /* |
2295 | * there are two premises: | |
2296 | * a) deliver good data to the caller | |
2297 | * b) correct the bad sectors on disk | |
2298 | */ | |
2299 | if (failed_bio->bi_vcnt > 1) { | |
2300 | /* | |
2301 | * to fulfill b), we need to know the exact failing sectors, as | |
2302 | * we don't want to rewrite any more than the failed ones. thus, | |
2303 | * we need separate read requests for the failed bio | |
2304 | * | |
2305 | * if the following BUG_ON triggers, our validation request got | |
2306 | * merged. we need separate requests for our algorithm to work. | |
2307 | */ | |
2308 | BUG_ON(failrec->in_validation); | |
2309 | failrec->in_validation = 1; | |
2310 | failrec->this_mirror = failed_mirror; | |
4a54c8c1 JS |
2311 | } else { |
2312 | /* | |
2313 | * we're ready to fulfill a) and b) alongside. get a good copy | |
2314 | * of the failed sector and if we succeed, we have setup | |
2315 | * everything for repair_io_failure to do the rest for us. | |
2316 | */ | |
2317 | if (failrec->in_validation) { | |
2318 | BUG_ON(failrec->this_mirror != failed_mirror); | |
2319 | failrec->in_validation = 0; | |
2320 | failrec->this_mirror = 0; | |
2321 | } | |
2322 | failrec->failed_mirror = failed_mirror; | |
2323 | failrec->this_mirror++; | |
2324 | if (failrec->this_mirror == failed_mirror) | |
2325 | failrec->this_mirror++; | |
4a54c8c1 JS |
2326 | } |
2327 | ||
facc8a22 | 2328 | if (failrec->this_mirror > num_copies) { |
2fe6303e | 2329 | pr_debug("Check Repairable: (fail) num_copies=%d, next_mirror %d, failed_mirror %d\n", |
4a54c8c1 | 2330 | num_copies, failrec->this_mirror, failed_mirror); |
2fe6303e | 2331 | return 0; |
4a54c8c1 JS |
2332 | } |
2333 | ||
2fe6303e MX |
2334 | return 1; |
2335 | } | |
2336 | ||
2337 | ||
2338 | struct bio *btrfs_create_repair_bio(struct inode *inode, struct bio *failed_bio, | |
2339 | struct io_failure_record *failrec, | |
2340 | struct page *page, int pg_offset, int icsum, | |
8b110e39 | 2341 | bio_end_io_t *endio_func, void *data) |
2fe6303e MX |
2342 | { |
2343 | struct bio *bio; | |
2344 | struct btrfs_io_bio *btrfs_failed_bio; | |
2345 | struct btrfs_io_bio *btrfs_bio; | |
2346 | ||
9be3395b | 2347 | bio = btrfs_io_bio_alloc(GFP_NOFS, 1); |
2fe6303e MX |
2348 | if (!bio) |
2349 | return NULL; | |
2350 | ||
2351 | bio->bi_end_io = endio_func; | |
4f024f37 | 2352 | bio->bi_iter.bi_sector = failrec->logical >> 9; |
4a54c8c1 | 2353 | bio->bi_bdev = BTRFS_I(inode)->root->fs_info->fs_devices->latest_bdev; |
4f024f37 | 2354 | bio->bi_iter.bi_size = 0; |
8b110e39 | 2355 | bio->bi_private = data; |
4a54c8c1 | 2356 | |
facc8a22 MX |
2357 | btrfs_failed_bio = btrfs_io_bio(failed_bio); |
2358 | if (btrfs_failed_bio->csum) { | |
2359 | struct btrfs_fs_info *fs_info = BTRFS_I(inode)->root->fs_info; | |
2360 | u16 csum_size = btrfs_super_csum_size(fs_info->super_copy); | |
2361 | ||
2362 | btrfs_bio = btrfs_io_bio(bio); | |
2363 | btrfs_bio->csum = btrfs_bio->csum_inline; | |
2fe6303e MX |
2364 | icsum *= csum_size; |
2365 | memcpy(btrfs_bio->csum, btrfs_failed_bio->csum + icsum, | |
facc8a22 MX |
2366 | csum_size); |
2367 | } | |
2368 | ||
2fe6303e MX |
2369 | bio_add_page(bio, page, failrec->len, pg_offset); |
2370 | ||
2371 | return bio; | |
2372 | } | |
2373 | ||
2374 | /* | |
2375 | * this is a generic handler for readpage errors (default | |
2376 | * readpage_io_failed_hook). if other copies exist, read those and write back | |
2377 | * good data to the failed position. does not investigate in remapping the | |
2378 | * failed extent elsewhere, hoping the device will be smart enough to do this as | |
2379 | * needed | |
2380 | */ | |
2381 | ||
2382 | static int bio_readpage_error(struct bio *failed_bio, u64 phy_offset, | |
2383 | struct page *page, u64 start, u64 end, | |
2384 | int failed_mirror) | |
2385 | { | |
2386 | struct io_failure_record *failrec; | |
2387 | struct inode *inode = page->mapping->host; | |
2388 | struct extent_io_tree *tree = &BTRFS_I(inode)->io_tree; | |
2389 | struct bio *bio; | |
2390 | int read_mode; | |
2391 | int ret; | |
2392 | ||
2393 | BUG_ON(failed_bio->bi_rw & REQ_WRITE); | |
2394 | ||
2395 | ret = btrfs_get_io_failure_record(inode, start, end, &failrec); | |
2396 | if (ret) | |
2397 | return ret; | |
2398 | ||
2399 | ret = btrfs_check_repairable(inode, failed_bio, failrec, failed_mirror); | |
2400 | if (!ret) { | |
2401 | free_io_failure(inode, failrec); | |
2402 | return -EIO; | |
2403 | } | |
2404 | ||
2405 | if (failed_bio->bi_vcnt > 1) | |
2406 | read_mode = READ_SYNC | REQ_FAILFAST_DEV; | |
2407 | else | |
2408 | read_mode = READ_SYNC; | |
2409 | ||
2410 | phy_offset >>= inode->i_sb->s_blocksize_bits; | |
2411 | bio = btrfs_create_repair_bio(inode, failed_bio, failrec, page, | |
2412 | start - page_offset(page), | |
8b110e39 MX |
2413 | (int)phy_offset, failed_bio->bi_end_io, |
2414 | NULL); | |
2fe6303e MX |
2415 | if (!bio) { |
2416 | free_io_failure(inode, failrec); | |
2417 | return -EIO; | |
2418 | } | |
4a54c8c1 | 2419 | |
2fe6303e MX |
2420 | pr_debug("Repair Read Error: submitting new read[%#x] to this_mirror=%d, in_validation=%d\n", |
2421 | read_mode, failrec->this_mirror, failrec->in_validation); | |
4a54c8c1 | 2422 | |
013bd4c3 TI |
2423 | ret = tree->ops->submit_bio_hook(inode, read_mode, bio, |
2424 | failrec->this_mirror, | |
2425 | failrec->bio_flags, 0); | |
6c387ab2 | 2426 | if (ret) { |
454ff3de | 2427 | free_io_failure(inode, failrec); |
6c387ab2 MX |
2428 | bio_put(bio); |
2429 | } | |
2430 | ||
013bd4c3 | 2431 | return ret; |
4a54c8c1 JS |
2432 | } |
2433 | ||
d1310b2e CM |
2434 | /* lots and lots of room for performance fixes in the end_bio funcs */ |
2435 | ||
87826df0 JM |
2436 | int end_extent_writepage(struct page *page, int err, u64 start, u64 end) |
2437 | { | |
2438 | int uptodate = (err == 0); | |
2439 | struct extent_io_tree *tree; | |
3e2426bd | 2440 | int ret = 0; |
87826df0 JM |
2441 | |
2442 | tree = &BTRFS_I(page->mapping->host)->io_tree; | |
2443 | ||
2444 | if (tree->ops && tree->ops->writepage_end_io_hook) { | |
2445 | ret = tree->ops->writepage_end_io_hook(page, start, | |
2446 | end, NULL, uptodate); | |
2447 | if (ret) | |
2448 | uptodate = 0; | |
2449 | } | |
2450 | ||
87826df0 | 2451 | if (!uptodate) { |
87826df0 JM |
2452 | ClearPageUptodate(page); |
2453 | SetPageError(page); | |
5dca6eea LB |
2454 | ret = ret < 0 ? ret : -EIO; |
2455 | mapping_set_error(page->mapping, ret); | |
87826df0 JM |
2456 | } |
2457 | return 0; | |
2458 | } | |
2459 | ||
d1310b2e CM |
2460 | /* |
2461 | * after a writepage IO is done, we need to: | |
2462 | * clear the uptodate bits on error | |
2463 | * clear the writeback bits in the extent tree for this IO | |
2464 | * end_page_writeback if the page has no more pending IO | |
2465 | * | |
2466 | * Scheduling is not allowed, so the extent state tree is expected | |
2467 | * to have one and only one object corresponding to this IO. | |
2468 | */ | |
d1310b2e | 2469 | static void end_bio_extent_writepage(struct bio *bio, int err) |
d1310b2e | 2470 | { |
2c30c71b | 2471 | struct bio_vec *bvec; |
d1310b2e CM |
2472 | u64 start; |
2473 | u64 end; | |
2c30c71b | 2474 | int i; |
d1310b2e | 2475 | |
2c30c71b | 2476 | bio_for_each_segment_all(bvec, bio, i) { |
d1310b2e | 2477 | struct page *page = bvec->bv_page; |
902b22f3 | 2478 | |
17a5adcc AO |
2479 | /* We always issue full-page reads, but if some block |
2480 | * in a page fails to read, blk_update_request() will | |
2481 | * advance bv_offset and adjust bv_len to compensate. | |
2482 | * Print a warning for nonzero offsets, and an error | |
2483 | * if they don't add up to a full page. */ | |
efe120a0 FH |
2484 | if (bvec->bv_offset || bvec->bv_len != PAGE_CACHE_SIZE) { |
2485 | if (bvec->bv_offset + bvec->bv_len != PAGE_CACHE_SIZE) | |
2486 | btrfs_err(BTRFS_I(page->mapping->host)->root->fs_info, | |
2487 | "partial page write in btrfs with offset %u and length %u", | |
2488 | bvec->bv_offset, bvec->bv_len); | |
2489 | else | |
2490 | btrfs_info(BTRFS_I(page->mapping->host)->root->fs_info, | |
2491 | "incomplete page write in btrfs with offset %u and " | |
2492 | "length %u", | |
2493 | bvec->bv_offset, bvec->bv_len); | |
2494 | } | |
d1310b2e | 2495 | |
17a5adcc AO |
2496 | start = page_offset(page); |
2497 | end = start + bvec->bv_offset + bvec->bv_len - 1; | |
d1310b2e | 2498 | |
87826df0 JM |
2499 | if (end_extent_writepage(page, err, start, end)) |
2500 | continue; | |
70dec807 | 2501 | |
17a5adcc | 2502 | end_page_writeback(page); |
2c30c71b | 2503 | } |
2b1f55b0 | 2504 | |
d1310b2e | 2505 | bio_put(bio); |
d1310b2e CM |
2506 | } |
2507 | ||
883d0de4 MX |
2508 | static void |
2509 | endio_readpage_release_extent(struct extent_io_tree *tree, u64 start, u64 len, | |
2510 | int uptodate) | |
2511 | { | |
2512 | struct extent_state *cached = NULL; | |
2513 | u64 end = start + len - 1; | |
2514 | ||
2515 | if (uptodate && tree->track_uptodate) | |
2516 | set_extent_uptodate(tree, start, end, &cached, GFP_ATOMIC); | |
2517 | unlock_extent_cached(tree, start, end, &cached, GFP_ATOMIC); | |
2518 | } | |
2519 | ||
d1310b2e CM |
2520 | /* |
2521 | * after a readpage IO is done, we need to: | |
2522 | * clear the uptodate bits on error | |
2523 | * set the uptodate bits if things worked | |
2524 | * set the page up to date if all extents in the tree are uptodate | |
2525 | * clear the lock bit in the extent tree | |
2526 | * unlock the page if there are no other extents locked for it | |
2527 | * | |
2528 | * Scheduling is not allowed, so the extent state tree is expected | |
2529 | * to have one and only one object corresponding to this IO. | |
2530 | */ | |
d1310b2e | 2531 | static void end_bio_extent_readpage(struct bio *bio, int err) |
d1310b2e | 2532 | { |
2c30c71b | 2533 | struct bio_vec *bvec; |
d1310b2e | 2534 | int uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags); |
facc8a22 | 2535 | struct btrfs_io_bio *io_bio = btrfs_io_bio(bio); |
902b22f3 | 2536 | struct extent_io_tree *tree; |
facc8a22 | 2537 | u64 offset = 0; |
d1310b2e CM |
2538 | u64 start; |
2539 | u64 end; | |
facc8a22 | 2540 | u64 len; |
883d0de4 MX |
2541 | u64 extent_start = 0; |
2542 | u64 extent_len = 0; | |
5cf1ab56 | 2543 | int mirror; |
d1310b2e | 2544 | int ret; |
2c30c71b | 2545 | int i; |
d1310b2e | 2546 | |
d20f7043 CM |
2547 | if (err) |
2548 | uptodate = 0; | |
2549 | ||
2c30c71b | 2550 | bio_for_each_segment_all(bvec, bio, i) { |
d1310b2e | 2551 | struct page *page = bvec->bv_page; |
a71754fc | 2552 | struct inode *inode = page->mapping->host; |
507903b8 | 2553 | |
be3940c0 | 2554 | pr_debug("end_bio_extent_readpage: bi_sector=%llu, err=%d, " |
c1dc0896 | 2555 | "mirror=%u\n", (u64)bio->bi_iter.bi_sector, err, |
9be3395b | 2556 | io_bio->mirror_num); |
a71754fc | 2557 | tree = &BTRFS_I(inode)->io_tree; |
902b22f3 | 2558 | |
17a5adcc AO |
2559 | /* We always issue full-page reads, but if some block |
2560 | * in a page fails to read, blk_update_request() will | |
2561 | * advance bv_offset and adjust bv_len to compensate. | |
2562 | * Print a warning for nonzero offsets, and an error | |
2563 | * if they don't add up to a full page. */ | |
efe120a0 FH |
2564 | if (bvec->bv_offset || bvec->bv_len != PAGE_CACHE_SIZE) { |
2565 | if (bvec->bv_offset + bvec->bv_len != PAGE_CACHE_SIZE) | |
2566 | btrfs_err(BTRFS_I(page->mapping->host)->root->fs_info, | |
2567 | "partial page read in btrfs with offset %u and length %u", | |
2568 | bvec->bv_offset, bvec->bv_len); | |
2569 | else | |
2570 | btrfs_info(BTRFS_I(page->mapping->host)->root->fs_info, | |
2571 | "incomplete page read in btrfs with offset %u and " | |
2572 | "length %u", | |
2573 | bvec->bv_offset, bvec->bv_len); | |
2574 | } | |
d1310b2e | 2575 | |
17a5adcc AO |
2576 | start = page_offset(page); |
2577 | end = start + bvec->bv_offset + bvec->bv_len - 1; | |
facc8a22 | 2578 | len = bvec->bv_len; |
d1310b2e | 2579 | |
9be3395b | 2580 | mirror = io_bio->mirror_num; |
f2a09da9 MX |
2581 | if (likely(uptodate && tree->ops && |
2582 | tree->ops->readpage_end_io_hook)) { | |
facc8a22 MX |
2583 | ret = tree->ops->readpage_end_io_hook(io_bio, offset, |
2584 | page, start, end, | |
2585 | mirror); | |
5ee0844d | 2586 | if (ret) |
d1310b2e | 2587 | uptodate = 0; |
5ee0844d | 2588 | else |
1203b681 | 2589 | clean_io_failure(inode, start, page, 0); |
d1310b2e | 2590 | } |
ea466794 | 2591 | |
f2a09da9 MX |
2592 | if (likely(uptodate)) |
2593 | goto readpage_ok; | |
2594 | ||
2595 | if (tree->ops && tree->ops->readpage_io_failed_hook) { | |
5cf1ab56 | 2596 | ret = tree->ops->readpage_io_failed_hook(page, mirror); |
ea466794 JB |
2597 | if (!ret && !err && |
2598 | test_bit(BIO_UPTODATE, &bio->bi_flags)) | |
2599 | uptodate = 1; | |
f2a09da9 | 2600 | } else { |
f4a8e656 JS |
2601 | /* |
2602 | * The generic bio_readpage_error handles errors the | |
2603 | * following way: If possible, new read requests are | |
2604 | * created and submitted and will end up in | |
2605 | * end_bio_extent_readpage as well (if we're lucky, not | |
2606 | * in the !uptodate case). In that case it returns 0 and | |
2607 | * we just go on with the next page in our bio. If it | |
2608 | * can't handle the error it will return -EIO and we | |
2609 | * remain responsible for that page. | |
2610 | */ | |
facc8a22 MX |
2611 | ret = bio_readpage_error(bio, offset, page, start, end, |
2612 | mirror); | |
7e38326f | 2613 | if (ret == 0) { |
3b951516 CM |
2614 | uptodate = |
2615 | test_bit(BIO_UPTODATE, &bio->bi_flags); | |
d20f7043 CM |
2616 | if (err) |
2617 | uptodate = 0; | |
38c1c2e4 | 2618 | offset += len; |
7e38326f CM |
2619 | continue; |
2620 | } | |
2621 | } | |
f2a09da9 | 2622 | readpage_ok: |
883d0de4 | 2623 | if (likely(uptodate)) { |
a71754fc JB |
2624 | loff_t i_size = i_size_read(inode); |
2625 | pgoff_t end_index = i_size >> PAGE_CACHE_SHIFT; | |
a583c026 | 2626 | unsigned off; |
a71754fc JB |
2627 | |
2628 | /* Zero out the end if this page straddles i_size */ | |
a583c026 LB |
2629 | off = i_size & (PAGE_CACHE_SIZE-1); |
2630 | if (page->index == end_index && off) | |
2631 | zero_user_segment(page, off, PAGE_CACHE_SIZE); | |
17a5adcc | 2632 | SetPageUptodate(page); |
70dec807 | 2633 | } else { |
17a5adcc AO |
2634 | ClearPageUptodate(page); |
2635 | SetPageError(page); | |
70dec807 | 2636 | } |
17a5adcc | 2637 | unlock_page(page); |
facc8a22 | 2638 | offset += len; |
883d0de4 MX |
2639 | |
2640 | if (unlikely(!uptodate)) { | |
2641 | if (extent_len) { | |
2642 | endio_readpage_release_extent(tree, | |
2643 | extent_start, | |
2644 | extent_len, 1); | |
2645 | extent_start = 0; | |
2646 | extent_len = 0; | |
2647 | } | |
2648 | endio_readpage_release_extent(tree, start, | |
2649 | end - start + 1, 0); | |
2650 | } else if (!extent_len) { | |
2651 | extent_start = start; | |
2652 | extent_len = end + 1 - start; | |
2653 | } else if (extent_start + extent_len == start) { | |
2654 | extent_len += end + 1 - start; | |
2655 | } else { | |
2656 | endio_readpage_release_extent(tree, extent_start, | |
2657 | extent_len, uptodate); | |
2658 | extent_start = start; | |
2659 | extent_len = end + 1 - start; | |
2660 | } | |
2c30c71b | 2661 | } |
d1310b2e | 2662 | |
883d0de4 MX |
2663 | if (extent_len) |
2664 | endio_readpage_release_extent(tree, extent_start, extent_len, | |
2665 | uptodate); | |
facc8a22 MX |
2666 | if (io_bio->end_io) |
2667 | io_bio->end_io(io_bio, err); | |
d1310b2e | 2668 | bio_put(bio); |
d1310b2e CM |
2669 | } |
2670 | ||
9be3395b CM |
2671 | /* |
2672 | * this allocates from the btrfs_bioset. We're returning a bio right now | |
2673 | * but you can call btrfs_io_bio for the appropriate container_of magic | |
2674 | */ | |
88f794ed MX |
2675 | struct bio * |
2676 | btrfs_bio_alloc(struct block_device *bdev, u64 first_sector, int nr_vecs, | |
2677 | gfp_t gfp_flags) | |
d1310b2e | 2678 | { |
facc8a22 | 2679 | struct btrfs_io_bio *btrfs_bio; |
d1310b2e CM |
2680 | struct bio *bio; |
2681 | ||
9be3395b | 2682 | bio = bio_alloc_bioset(gfp_flags, nr_vecs, btrfs_bioset); |
d1310b2e CM |
2683 | |
2684 | if (bio == NULL && (current->flags & PF_MEMALLOC)) { | |
9be3395b CM |
2685 | while (!bio && (nr_vecs /= 2)) { |
2686 | bio = bio_alloc_bioset(gfp_flags, | |
2687 | nr_vecs, btrfs_bioset); | |
2688 | } | |
d1310b2e CM |
2689 | } |
2690 | ||
2691 | if (bio) { | |
2692 | bio->bi_bdev = bdev; | |
4f024f37 | 2693 | bio->bi_iter.bi_sector = first_sector; |
facc8a22 MX |
2694 | btrfs_bio = btrfs_io_bio(bio); |
2695 | btrfs_bio->csum = NULL; | |
2696 | btrfs_bio->csum_allocated = NULL; | |
2697 | btrfs_bio->end_io = NULL; | |
d1310b2e CM |
2698 | } |
2699 | return bio; | |
2700 | } | |
2701 | ||
9be3395b CM |
2702 | struct bio *btrfs_bio_clone(struct bio *bio, gfp_t gfp_mask) |
2703 | { | |
23ea8e5a MX |
2704 | struct btrfs_io_bio *btrfs_bio; |
2705 | struct bio *new; | |
9be3395b | 2706 | |
23ea8e5a MX |
2707 | new = bio_clone_bioset(bio, gfp_mask, btrfs_bioset); |
2708 | if (new) { | |
2709 | btrfs_bio = btrfs_io_bio(new); | |
2710 | btrfs_bio->csum = NULL; | |
2711 | btrfs_bio->csum_allocated = NULL; | |
2712 | btrfs_bio->end_io = NULL; | |
2713 | } | |
2714 | return new; | |
2715 | } | |
9be3395b CM |
2716 | |
2717 | /* this also allocates from the btrfs_bioset */ | |
2718 | struct bio *btrfs_io_bio_alloc(gfp_t gfp_mask, unsigned int nr_iovecs) | |
2719 | { | |
facc8a22 MX |
2720 | struct btrfs_io_bio *btrfs_bio; |
2721 | struct bio *bio; | |
2722 | ||
2723 | bio = bio_alloc_bioset(gfp_mask, nr_iovecs, btrfs_bioset); | |
2724 | if (bio) { | |
2725 | btrfs_bio = btrfs_io_bio(bio); | |
2726 | btrfs_bio->csum = NULL; | |
2727 | btrfs_bio->csum_allocated = NULL; | |
2728 | btrfs_bio->end_io = NULL; | |
2729 | } | |
2730 | return bio; | |
9be3395b CM |
2731 | } |
2732 | ||
2733 | ||
355808c2 JM |
2734 | static int __must_check submit_one_bio(int rw, struct bio *bio, |
2735 | int mirror_num, unsigned long bio_flags) | |
d1310b2e | 2736 | { |
d1310b2e | 2737 | int ret = 0; |
70dec807 CM |
2738 | struct bio_vec *bvec = bio->bi_io_vec + bio->bi_vcnt - 1; |
2739 | struct page *page = bvec->bv_page; | |
2740 | struct extent_io_tree *tree = bio->bi_private; | |
70dec807 | 2741 | u64 start; |
70dec807 | 2742 | |
4eee4fa4 | 2743 | start = page_offset(page) + bvec->bv_offset; |
70dec807 | 2744 | |
902b22f3 | 2745 | bio->bi_private = NULL; |
d1310b2e CM |
2746 | |
2747 | bio_get(bio); | |
2748 | ||
065631f6 | 2749 | if (tree->ops && tree->ops->submit_bio_hook) |
6b82ce8d | 2750 | ret = tree->ops->submit_bio_hook(page->mapping->host, rw, bio, |
eaf25d93 | 2751 | mirror_num, bio_flags, start); |
0b86a832 | 2752 | else |
21adbd5c | 2753 | btrfsic_submit_bio(rw, bio); |
4a54c8c1 | 2754 | |
d1310b2e CM |
2755 | if (bio_flagged(bio, BIO_EOPNOTSUPP)) |
2756 | ret = -EOPNOTSUPP; | |
2757 | bio_put(bio); | |
2758 | return ret; | |
2759 | } | |
2760 | ||
64a16701 | 2761 | static int merge_bio(int rw, struct extent_io_tree *tree, struct page *page, |
3444a972 JM |
2762 | unsigned long offset, size_t size, struct bio *bio, |
2763 | unsigned long bio_flags) | |
2764 | { | |
2765 | int ret = 0; | |
2766 | if (tree->ops && tree->ops->merge_bio_hook) | |
64a16701 | 2767 | ret = tree->ops->merge_bio_hook(rw, page, offset, size, bio, |
3444a972 JM |
2768 | bio_flags); |
2769 | BUG_ON(ret < 0); | |
2770 | return ret; | |
2771 | ||
2772 | } | |
2773 | ||
d1310b2e CM |
2774 | static int submit_extent_page(int rw, struct extent_io_tree *tree, |
2775 | struct page *page, sector_t sector, | |
2776 | size_t size, unsigned long offset, | |
2777 | struct block_device *bdev, | |
2778 | struct bio **bio_ret, | |
2779 | unsigned long max_pages, | |
f188591e | 2780 | bio_end_io_t end_io_func, |
c8b97818 CM |
2781 | int mirror_num, |
2782 | unsigned long prev_bio_flags, | |
2783 | unsigned long bio_flags) | |
d1310b2e CM |
2784 | { |
2785 | int ret = 0; | |
2786 | struct bio *bio; | |
2787 | int nr; | |
c8b97818 CM |
2788 | int contig = 0; |
2789 | int this_compressed = bio_flags & EXTENT_BIO_COMPRESSED; | |
2790 | int old_compressed = prev_bio_flags & EXTENT_BIO_COMPRESSED; | |
5b050f04 | 2791 | size_t page_size = min_t(size_t, size, PAGE_CACHE_SIZE); |
d1310b2e CM |
2792 | |
2793 | if (bio_ret && *bio_ret) { | |
2794 | bio = *bio_ret; | |
c8b97818 | 2795 | if (old_compressed) |
4f024f37 | 2796 | contig = bio->bi_iter.bi_sector == sector; |
c8b97818 | 2797 | else |
f73a1c7d | 2798 | contig = bio_end_sector(bio) == sector; |
c8b97818 CM |
2799 | |
2800 | if (prev_bio_flags != bio_flags || !contig || | |
64a16701 | 2801 | merge_bio(rw, tree, page, offset, page_size, bio, bio_flags) || |
c8b97818 CM |
2802 | bio_add_page(bio, page, page_size, offset) < page_size) { |
2803 | ret = submit_one_bio(rw, bio, mirror_num, | |
2804 | prev_bio_flags); | |
79787eaa JM |
2805 | if (ret < 0) |
2806 | return ret; | |
d1310b2e CM |
2807 | bio = NULL; |
2808 | } else { | |
2809 | return 0; | |
2810 | } | |
2811 | } | |
c8b97818 CM |
2812 | if (this_compressed) |
2813 | nr = BIO_MAX_PAGES; | |
2814 | else | |
2815 | nr = bio_get_nr_vecs(bdev); | |
2816 | ||
88f794ed | 2817 | bio = btrfs_bio_alloc(bdev, sector, nr, GFP_NOFS | __GFP_HIGH); |
5df67083 TI |
2818 | if (!bio) |
2819 | return -ENOMEM; | |
70dec807 | 2820 | |
c8b97818 | 2821 | bio_add_page(bio, page, page_size, offset); |
d1310b2e CM |
2822 | bio->bi_end_io = end_io_func; |
2823 | bio->bi_private = tree; | |
70dec807 | 2824 | |
d397712b | 2825 | if (bio_ret) |
d1310b2e | 2826 | *bio_ret = bio; |
d397712b | 2827 | else |
c8b97818 | 2828 | ret = submit_one_bio(rw, bio, mirror_num, bio_flags); |
d1310b2e CM |
2829 | |
2830 | return ret; | |
2831 | } | |
2832 | ||
48a3b636 ES |
2833 | static void attach_extent_buffer_page(struct extent_buffer *eb, |
2834 | struct page *page) | |
d1310b2e CM |
2835 | { |
2836 | if (!PagePrivate(page)) { | |
2837 | SetPagePrivate(page); | |
d1310b2e | 2838 | page_cache_get(page); |
4f2de97a JB |
2839 | set_page_private(page, (unsigned long)eb); |
2840 | } else { | |
2841 | WARN_ON(page->private != (unsigned long)eb); | |
d1310b2e CM |
2842 | } |
2843 | } | |
2844 | ||
4f2de97a | 2845 | void set_page_extent_mapped(struct page *page) |
d1310b2e | 2846 | { |
4f2de97a JB |
2847 | if (!PagePrivate(page)) { |
2848 | SetPagePrivate(page); | |
2849 | page_cache_get(page); | |
2850 | set_page_private(page, EXTENT_PAGE_PRIVATE); | |
2851 | } | |
d1310b2e CM |
2852 | } |
2853 | ||
125bac01 MX |
2854 | static struct extent_map * |
2855 | __get_extent_map(struct inode *inode, struct page *page, size_t pg_offset, | |
2856 | u64 start, u64 len, get_extent_t *get_extent, | |
2857 | struct extent_map **em_cached) | |
2858 | { | |
2859 | struct extent_map *em; | |
2860 | ||
2861 | if (em_cached && *em_cached) { | |
2862 | em = *em_cached; | |
cbc0e928 | 2863 | if (extent_map_in_tree(em) && start >= em->start && |
125bac01 MX |
2864 | start < extent_map_end(em)) { |
2865 | atomic_inc(&em->refs); | |
2866 | return em; | |
2867 | } | |
2868 | ||
2869 | free_extent_map(em); | |
2870 | *em_cached = NULL; | |
2871 | } | |
2872 | ||
2873 | em = get_extent(inode, page, pg_offset, start, len, 0); | |
2874 | if (em_cached && !IS_ERR_OR_NULL(em)) { | |
2875 | BUG_ON(*em_cached); | |
2876 | atomic_inc(&em->refs); | |
2877 | *em_cached = em; | |
2878 | } | |
2879 | return em; | |
2880 | } | |
d1310b2e CM |
2881 | /* |
2882 | * basic readpage implementation. Locked extent state structs are inserted | |
2883 | * into the tree that are removed when the IO is done (by the end_io | |
2884 | * handlers) | |
79787eaa | 2885 | * XXX JDM: This needs looking at to ensure proper page locking |
d1310b2e | 2886 | */ |
9974090b MX |
2887 | static int __do_readpage(struct extent_io_tree *tree, |
2888 | struct page *page, | |
2889 | get_extent_t *get_extent, | |
125bac01 | 2890 | struct extent_map **em_cached, |
9974090b MX |
2891 | struct bio **bio, int mirror_num, |
2892 | unsigned long *bio_flags, int rw) | |
d1310b2e CM |
2893 | { |
2894 | struct inode *inode = page->mapping->host; | |
4eee4fa4 | 2895 | u64 start = page_offset(page); |
d1310b2e CM |
2896 | u64 page_end = start + PAGE_CACHE_SIZE - 1; |
2897 | u64 end; | |
2898 | u64 cur = start; | |
2899 | u64 extent_offset; | |
2900 | u64 last_byte = i_size_read(inode); | |
2901 | u64 block_start; | |
2902 | u64 cur_end; | |
2903 | sector_t sector; | |
2904 | struct extent_map *em; | |
2905 | struct block_device *bdev; | |
2906 | int ret; | |
2907 | int nr = 0; | |
4b384318 | 2908 | int parent_locked = *bio_flags & EXTENT_BIO_PARENT_LOCKED; |
306e16ce | 2909 | size_t pg_offset = 0; |
d1310b2e | 2910 | size_t iosize; |
c8b97818 | 2911 | size_t disk_io_size; |
d1310b2e | 2912 | size_t blocksize = inode->i_sb->s_blocksize; |
4b384318 | 2913 | unsigned long this_bio_flag = *bio_flags & EXTENT_BIO_PARENT_LOCKED; |
d1310b2e CM |
2914 | |
2915 | set_page_extent_mapped(page); | |
2916 | ||
9974090b | 2917 | end = page_end; |
90a887c9 DM |
2918 | if (!PageUptodate(page)) { |
2919 | if (cleancache_get_page(page) == 0) { | |
2920 | BUG_ON(blocksize != PAGE_SIZE); | |
9974090b | 2921 | unlock_extent(tree, start, end); |
90a887c9 DM |
2922 | goto out; |
2923 | } | |
2924 | } | |
2925 | ||
c8b97818 CM |
2926 | if (page->index == last_byte >> PAGE_CACHE_SHIFT) { |
2927 | char *userpage; | |
2928 | size_t zero_offset = last_byte & (PAGE_CACHE_SIZE - 1); | |
2929 | ||
2930 | if (zero_offset) { | |
2931 | iosize = PAGE_CACHE_SIZE - zero_offset; | |
7ac687d9 | 2932 | userpage = kmap_atomic(page); |
c8b97818 CM |
2933 | memset(userpage + zero_offset, 0, iosize); |
2934 | flush_dcache_page(page); | |
7ac687d9 | 2935 | kunmap_atomic(userpage); |
c8b97818 CM |
2936 | } |
2937 | } | |
d1310b2e | 2938 | while (cur <= end) { |
c8f2f24b JB |
2939 | unsigned long pnr = (last_byte >> PAGE_CACHE_SHIFT) + 1; |
2940 | ||
d1310b2e CM |
2941 | if (cur >= last_byte) { |
2942 | char *userpage; | |
507903b8 AJ |
2943 | struct extent_state *cached = NULL; |
2944 | ||
306e16ce | 2945 | iosize = PAGE_CACHE_SIZE - pg_offset; |
7ac687d9 | 2946 | userpage = kmap_atomic(page); |
306e16ce | 2947 | memset(userpage + pg_offset, 0, iosize); |
d1310b2e | 2948 | flush_dcache_page(page); |
7ac687d9 | 2949 | kunmap_atomic(userpage); |
d1310b2e | 2950 | set_extent_uptodate(tree, cur, cur + iosize - 1, |
507903b8 | 2951 | &cached, GFP_NOFS); |
4b384318 MF |
2952 | if (!parent_locked) |
2953 | unlock_extent_cached(tree, cur, | |
2954 | cur + iosize - 1, | |
2955 | &cached, GFP_NOFS); | |
d1310b2e CM |
2956 | break; |
2957 | } | |
125bac01 MX |
2958 | em = __get_extent_map(inode, page, pg_offset, cur, |
2959 | end - cur + 1, get_extent, em_cached); | |
c704005d | 2960 | if (IS_ERR_OR_NULL(em)) { |
d1310b2e | 2961 | SetPageError(page); |
4b384318 MF |
2962 | if (!parent_locked) |
2963 | unlock_extent(tree, cur, end); | |
d1310b2e CM |
2964 | break; |
2965 | } | |
d1310b2e CM |
2966 | extent_offset = cur - em->start; |
2967 | BUG_ON(extent_map_end(em) <= cur); | |
2968 | BUG_ON(end < cur); | |
2969 | ||
261507a0 | 2970 | if (test_bit(EXTENT_FLAG_COMPRESSED, &em->flags)) { |
4b384318 | 2971 | this_bio_flag |= EXTENT_BIO_COMPRESSED; |
261507a0 LZ |
2972 | extent_set_compress_type(&this_bio_flag, |
2973 | em->compress_type); | |
2974 | } | |
c8b97818 | 2975 | |
d1310b2e CM |
2976 | iosize = min(extent_map_end(em) - cur, end - cur + 1); |
2977 | cur_end = min(extent_map_end(em) - 1, end); | |
fda2832f | 2978 | iosize = ALIGN(iosize, blocksize); |
c8b97818 CM |
2979 | if (this_bio_flag & EXTENT_BIO_COMPRESSED) { |
2980 | disk_io_size = em->block_len; | |
2981 | sector = em->block_start >> 9; | |
2982 | } else { | |
2983 | sector = (em->block_start + extent_offset) >> 9; | |
2984 | disk_io_size = iosize; | |
2985 | } | |
d1310b2e CM |
2986 | bdev = em->bdev; |
2987 | block_start = em->block_start; | |
d899e052 YZ |
2988 | if (test_bit(EXTENT_FLAG_PREALLOC, &em->flags)) |
2989 | block_start = EXTENT_MAP_HOLE; | |
d1310b2e CM |
2990 | free_extent_map(em); |
2991 | em = NULL; | |
2992 | ||
2993 | /* we've found a hole, just zero and go on */ | |
2994 | if (block_start == EXTENT_MAP_HOLE) { | |
2995 | char *userpage; | |
507903b8 AJ |
2996 | struct extent_state *cached = NULL; |
2997 | ||
7ac687d9 | 2998 | userpage = kmap_atomic(page); |
306e16ce | 2999 | memset(userpage + pg_offset, 0, iosize); |
d1310b2e | 3000 | flush_dcache_page(page); |
7ac687d9 | 3001 | kunmap_atomic(userpage); |
d1310b2e CM |
3002 | |
3003 | set_extent_uptodate(tree, cur, cur + iosize - 1, | |
507903b8 AJ |
3004 | &cached, GFP_NOFS); |
3005 | unlock_extent_cached(tree, cur, cur + iosize - 1, | |
3006 | &cached, GFP_NOFS); | |
d1310b2e | 3007 | cur = cur + iosize; |
306e16ce | 3008 | pg_offset += iosize; |
d1310b2e CM |
3009 | continue; |
3010 | } | |
3011 | /* the get_extent function already copied into the page */ | |
9655d298 CM |
3012 | if (test_range_bit(tree, cur, cur_end, |
3013 | EXTENT_UPTODATE, 1, NULL)) { | |
a1b32a59 | 3014 | check_page_uptodate(tree, page); |
4b384318 MF |
3015 | if (!parent_locked) |
3016 | unlock_extent(tree, cur, cur + iosize - 1); | |
d1310b2e | 3017 | cur = cur + iosize; |
306e16ce | 3018 | pg_offset += iosize; |
d1310b2e CM |
3019 | continue; |
3020 | } | |
70dec807 CM |
3021 | /* we have an inline extent but it didn't get marked up |
3022 | * to date. Error out | |
3023 | */ | |
3024 | if (block_start == EXTENT_MAP_INLINE) { | |
3025 | SetPageError(page); | |
4b384318 MF |
3026 | if (!parent_locked) |
3027 | unlock_extent(tree, cur, cur + iosize - 1); | |
70dec807 | 3028 | cur = cur + iosize; |
306e16ce | 3029 | pg_offset += iosize; |
70dec807 CM |
3030 | continue; |
3031 | } | |
d1310b2e | 3032 | |
c8f2f24b | 3033 | pnr -= page->index; |
d4c7ca86 | 3034 | ret = submit_extent_page(rw, tree, page, |
306e16ce | 3035 | sector, disk_io_size, pg_offset, |
89642229 | 3036 | bdev, bio, pnr, |
c8b97818 CM |
3037 | end_bio_extent_readpage, mirror_num, |
3038 | *bio_flags, | |
3039 | this_bio_flag); | |
c8f2f24b JB |
3040 | if (!ret) { |
3041 | nr++; | |
3042 | *bio_flags = this_bio_flag; | |
3043 | } else { | |
d1310b2e | 3044 | SetPageError(page); |
4b384318 MF |
3045 | if (!parent_locked) |
3046 | unlock_extent(tree, cur, cur + iosize - 1); | |
edd33c99 | 3047 | } |
d1310b2e | 3048 | cur = cur + iosize; |
306e16ce | 3049 | pg_offset += iosize; |
d1310b2e | 3050 | } |
90a887c9 | 3051 | out: |
d1310b2e CM |
3052 | if (!nr) { |
3053 | if (!PageError(page)) | |
3054 | SetPageUptodate(page); | |
3055 | unlock_page(page); | |
3056 | } | |
3057 | return 0; | |
3058 | } | |
3059 | ||
9974090b MX |
3060 | static inline void __do_contiguous_readpages(struct extent_io_tree *tree, |
3061 | struct page *pages[], int nr_pages, | |
3062 | u64 start, u64 end, | |
3063 | get_extent_t *get_extent, | |
125bac01 | 3064 | struct extent_map **em_cached, |
9974090b MX |
3065 | struct bio **bio, int mirror_num, |
3066 | unsigned long *bio_flags, int rw) | |
3067 | { | |
3068 | struct inode *inode; | |
3069 | struct btrfs_ordered_extent *ordered; | |
3070 | int index; | |
3071 | ||
3072 | inode = pages[0]->mapping->host; | |
3073 | while (1) { | |
3074 | lock_extent(tree, start, end); | |
3075 | ordered = btrfs_lookup_ordered_range(inode, start, | |
3076 | end - start + 1); | |
3077 | if (!ordered) | |
3078 | break; | |
3079 | unlock_extent(tree, start, end); | |
3080 | btrfs_start_ordered_extent(inode, ordered, 1); | |
3081 | btrfs_put_ordered_extent(ordered); | |
3082 | } | |
3083 | ||
3084 | for (index = 0; index < nr_pages; index++) { | |
125bac01 MX |
3085 | __do_readpage(tree, pages[index], get_extent, em_cached, bio, |
3086 | mirror_num, bio_flags, rw); | |
9974090b MX |
3087 | page_cache_release(pages[index]); |
3088 | } | |
3089 | } | |
3090 | ||
3091 | static void __extent_readpages(struct extent_io_tree *tree, | |
3092 | struct page *pages[], | |
3093 | int nr_pages, get_extent_t *get_extent, | |
125bac01 | 3094 | struct extent_map **em_cached, |
9974090b MX |
3095 | struct bio **bio, int mirror_num, |
3096 | unsigned long *bio_flags, int rw) | |
3097 | { | |
35a3621b | 3098 | u64 start = 0; |
9974090b MX |
3099 | u64 end = 0; |
3100 | u64 page_start; | |
3101 | int index; | |
35a3621b | 3102 | int first_index = 0; |
9974090b MX |
3103 | |
3104 | for (index = 0; index < nr_pages; index++) { | |
3105 | page_start = page_offset(pages[index]); | |
3106 | if (!end) { | |
3107 | start = page_start; | |
3108 | end = start + PAGE_CACHE_SIZE - 1; | |
3109 | first_index = index; | |
3110 | } else if (end + 1 == page_start) { | |
3111 | end += PAGE_CACHE_SIZE; | |
3112 | } else { | |
3113 | __do_contiguous_readpages(tree, &pages[first_index], | |
3114 | index - first_index, start, | |
125bac01 MX |
3115 | end, get_extent, em_cached, |
3116 | bio, mirror_num, bio_flags, | |
3117 | rw); | |
9974090b MX |
3118 | start = page_start; |
3119 | end = start + PAGE_CACHE_SIZE - 1; | |
3120 | first_index = index; | |
3121 | } | |
3122 | } | |
3123 | ||
3124 | if (end) | |
3125 | __do_contiguous_readpages(tree, &pages[first_index], | |
3126 | index - first_index, start, | |
125bac01 | 3127 | end, get_extent, em_cached, bio, |
9974090b MX |
3128 | mirror_num, bio_flags, rw); |
3129 | } | |
3130 | ||
3131 | static int __extent_read_full_page(struct extent_io_tree *tree, | |
3132 | struct page *page, | |
3133 | get_extent_t *get_extent, | |
3134 | struct bio **bio, int mirror_num, | |
3135 | unsigned long *bio_flags, int rw) | |
3136 | { | |
3137 | struct inode *inode = page->mapping->host; | |
3138 | struct btrfs_ordered_extent *ordered; | |
3139 | u64 start = page_offset(page); | |
3140 | u64 end = start + PAGE_CACHE_SIZE - 1; | |
3141 | int ret; | |
3142 | ||
3143 | while (1) { | |
3144 | lock_extent(tree, start, end); | |
3145 | ordered = btrfs_lookup_ordered_extent(inode, start); | |
3146 | if (!ordered) | |
3147 | break; | |
3148 | unlock_extent(tree, start, end); | |
3149 | btrfs_start_ordered_extent(inode, ordered, 1); | |
3150 | btrfs_put_ordered_extent(ordered); | |
3151 | } | |
3152 | ||
125bac01 MX |
3153 | ret = __do_readpage(tree, page, get_extent, NULL, bio, mirror_num, |
3154 | bio_flags, rw); | |
9974090b MX |
3155 | return ret; |
3156 | } | |
3157 | ||
d1310b2e | 3158 | int extent_read_full_page(struct extent_io_tree *tree, struct page *page, |
8ddc7d9c | 3159 | get_extent_t *get_extent, int mirror_num) |
d1310b2e CM |
3160 | { |
3161 | struct bio *bio = NULL; | |
c8b97818 | 3162 | unsigned long bio_flags = 0; |
d1310b2e CM |
3163 | int ret; |
3164 | ||
8ddc7d9c | 3165 | ret = __extent_read_full_page(tree, page, get_extent, &bio, mirror_num, |
d4c7ca86 | 3166 | &bio_flags, READ); |
d1310b2e | 3167 | if (bio) |
8ddc7d9c | 3168 | ret = submit_one_bio(READ, bio, mirror_num, bio_flags); |
d1310b2e CM |
3169 | return ret; |
3170 | } | |
d1310b2e | 3171 | |
4b384318 MF |
3172 | int extent_read_full_page_nolock(struct extent_io_tree *tree, struct page *page, |
3173 | get_extent_t *get_extent, int mirror_num) | |
3174 | { | |
3175 | struct bio *bio = NULL; | |
3176 | unsigned long bio_flags = EXTENT_BIO_PARENT_LOCKED; | |
3177 | int ret; | |
3178 | ||
3179 | ret = __do_readpage(tree, page, get_extent, NULL, &bio, mirror_num, | |
3180 | &bio_flags, READ); | |
3181 | if (bio) | |
3182 | ret = submit_one_bio(READ, bio, mirror_num, bio_flags); | |
3183 | return ret; | |
3184 | } | |
3185 | ||
11c8349b CM |
3186 | static noinline void update_nr_written(struct page *page, |
3187 | struct writeback_control *wbc, | |
3188 | unsigned long nr_written) | |
3189 | { | |
3190 | wbc->nr_to_write -= nr_written; | |
3191 | if (wbc->range_cyclic || (wbc->nr_to_write > 0 && | |
3192 | wbc->range_start == 0 && wbc->range_end == LLONG_MAX)) | |
3193 | page->mapping->writeback_index = page->index + nr_written; | |
3194 | } | |
3195 | ||
d1310b2e | 3196 | /* |
40f76580 CM |
3197 | * helper for __extent_writepage, doing all of the delayed allocation setup. |
3198 | * | |
3199 | * This returns 1 if our fill_delalloc function did all the work required | |
3200 | * to write the page (copy into inline extent). In this case the IO has | |
3201 | * been started and the page is already unlocked. | |
3202 | * | |
3203 | * This returns 0 if all went well (page still locked) | |
3204 | * This returns < 0 if there were errors (page still locked) | |
d1310b2e | 3205 | */ |
40f76580 CM |
3206 | static noinline_for_stack int writepage_delalloc(struct inode *inode, |
3207 | struct page *page, struct writeback_control *wbc, | |
3208 | struct extent_page_data *epd, | |
3209 | u64 delalloc_start, | |
3210 | unsigned long *nr_written) | |
3211 | { | |
3212 | struct extent_io_tree *tree = epd->tree; | |
3213 | u64 page_end = delalloc_start + PAGE_CACHE_SIZE - 1; | |
3214 | u64 nr_delalloc; | |
3215 | u64 delalloc_to_write = 0; | |
3216 | u64 delalloc_end = 0; | |
3217 | int ret; | |
3218 | int page_started = 0; | |
3219 | ||
3220 | if (epd->extent_locked || !tree->ops || !tree->ops->fill_delalloc) | |
3221 | return 0; | |
3222 | ||
3223 | while (delalloc_end < page_end) { | |
3224 | nr_delalloc = find_lock_delalloc_range(inode, tree, | |
3225 | page, | |
3226 | &delalloc_start, | |
3227 | &delalloc_end, | |
3228 | 128 * 1024 * 1024); | |
3229 | if (nr_delalloc == 0) { | |
3230 | delalloc_start = delalloc_end + 1; | |
3231 | continue; | |
3232 | } | |
3233 | ret = tree->ops->fill_delalloc(inode, page, | |
3234 | delalloc_start, | |
3235 | delalloc_end, | |
3236 | &page_started, | |
3237 | nr_written); | |
3238 | /* File system has been set read-only */ | |
3239 | if (ret) { | |
3240 | SetPageError(page); | |
3241 | /* fill_delalloc should be return < 0 for error | |
3242 | * but just in case, we use > 0 here meaning the | |
3243 | * IO is started, so we don't want to return > 0 | |
3244 | * unless things are going well. | |
3245 | */ | |
3246 | ret = ret < 0 ? ret : -EIO; | |
3247 | goto done; | |
3248 | } | |
3249 | /* | |
3250 | * delalloc_end is already one less than the total | |
3251 | * length, so we don't subtract one from | |
3252 | * PAGE_CACHE_SIZE | |
3253 | */ | |
3254 | delalloc_to_write += (delalloc_end - delalloc_start + | |
3255 | PAGE_CACHE_SIZE) >> | |
3256 | PAGE_CACHE_SHIFT; | |
3257 | delalloc_start = delalloc_end + 1; | |
3258 | } | |
3259 | if (wbc->nr_to_write < delalloc_to_write) { | |
3260 | int thresh = 8192; | |
3261 | ||
3262 | if (delalloc_to_write < thresh * 2) | |
3263 | thresh = delalloc_to_write; | |
3264 | wbc->nr_to_write = min_t(u64, delalloc_to_write, | |
3265 | thresh); | |
3266 | } | |
3267 | ||
3268 | /* did the fill delalloc function already unlock and start | |
3269 | * the IO? | |
3270 | */ | |
3271 | if (page_started) { | |
3272 | /* | |
3273 | * we've unlocked the page, so we can't update | |
3274 | * the mapping's writeback index, just update | |
3275 | * nr_to_write. | |
3276 | */ | |
3277 | wbc->nr_to_write -= *nr_written; | |
3278 | return 1; | |
3279 | } | |
3280 | ||
3281 | ret = 0; | |
3282 | ||
3283 | done: | |
3284 | return ret; | |
3285 | } | |
3286 | ||
3287 | /* | |
3288 | * helper for __extent_writepage. This calls the writepage start hooks, | |
3289 | * and does the loop to map the page into extents and bios. | |
3290 | * | |
3291 | * We return 1 if the IO is started and the page is unlocked, | |
3292 | * 0 if all went well (page still locked) | |
3293 | * < 0 if there were errors (page still locked) | |
3294 | */ | |
3295 | static noinline_for_stack int __extent_writepage_io(struct inode *inode, | |
3296 | struct page *page, | |
3297 | struct writeback_control *wbc, | |
3298 | struct extent_page_data *epd, | |
3299 | loff_t i_size, | |
3300 | unsigned long nr_written, | |
3301 | int write_flags, int *nr_ret) | |
d1310b2e | 3302 | { |
d1310b2e | 3303 | struct extent_io_tree *tree = epd->tree; |
4eee4fa4 | 3304 | u64 start = page_offset(page); |
d1310b2e CM |
3305 | u64 page_end = start + PAGE_CACHE_SIZE - 1; |
3306 | u64 end; | |
3307 | u64 cur = start; | |
3308 | u64 extent_offset; | |
d1310b2e CM |
3309 | u64 block_start; |
3310 | u64 iosize; | |
3311 | sector_t sector; | |
2c64c53d | 3312 | struct extent_state *cached_state = NULL; |
d1310b2e CM |
3313 | struct extent_map *em; |
3314 | struct block_device *bdev; | |
7f3c74fb | 3315 | size_t pg_offset = 0; |
d1310b2e | 3316 | size_t blocksize; |
40f76580 CM |
3317 | int ret = 0; |
3318 | int nr = 0; | |
3319 | bool compressed; | |
c8b97818 | 3320 | |
247e743c | 3321 | if (tree->ops && tree->ops->writepage_start_hook) { |
c8b97818 CM |
3322 | ret = tree->ops->writepage_start_hook(page, start, |
3323 | page_end); | |
87826df0 JM |
3324 | if (ret) { |
3325 | /* Fixup worker will requeue */ | |
3326 | if (ret == -EBUSY) | |
3327 | wbc->pages_skipped++; | |
3328 | else | |
3329 | redirty_page_for_writepage(wbc, page); | |
40f76580 | 3330 | |
11c8349b | 3331 | update_nr_written(page, wbc, nr_written); |
247e743c | 3332 | unlock_page(page); |
40f76580 | 3333 | ret = 1; |
11c8349b | 3334 | goto done_unlocked; |
247e743c CM |
3335 | } |
3336 | } | |
3337 | ||
11c8349b CM |
3338 | /* |
3339 | * we don't want to touch the inode after unlocking the page, | |
3340 | * so we update the mapping writeback index now | |
3341 | */ | |
3342 | update_nr_written(page, wbc, nr_written + 1); | |
771ed689 | 3343 | |
d1310b2e | 3344 | end = page_end; |
40f76580 | 3345 | if (i_size <= start) { |
e6dcd2dc CM |
3346 | if (tree->ops && tree->ops->writepage_end_io_hook) |
3347 | tree->ops->writepage_end_io_hook(page, start, | |
3348 | page_end, NULL, 1); | |
d1310b2e CM |
3349 | goto done; |
3350 | } | |
3351 | ||
d1310b2e CM |
3352 | blocksize = inode->i_sb->s_blocksize; |
3353 | ||
3354 | while (cur <= end) { | |
40f76580 CM |
3355 | u64 em_end; |
3356 | if (cur >= i_size) { | |
e6dcd2dc CM |
3357 | if (tree->ops && tree->ops->writepage_end_io_hook) |
3358 | tree->ops->writepage_end_io_hook(page, cur, | |
3359 | page_end, NULL, 1); | |
d1310b2e CM |
3360 | break; |
3361 | } | |
7f3c74fb | 3362 | em = epd->get_extent(inode, page, pg_offset, cur, |
d1310b2e | 3363 | end - cur + 1, 1); |
c704005d | 3364 | if (IS_ERR_OR_NULL(em)) { |
d1310b2e | 3365 | SetPageError(page); |
61391d56 | 3366 | ret = PTR_ERR_OR_ZERO(em); |
d1310b2e CM |
3367 | break; |
3368 | } | |
3369 | ||
3370 | extent_offset = cur - em->start; | |
40f76580 CM |
3371 | em_end = extent_map_end(em); |
3372 | BUG_ON(em_end <= cur); | |
d1310b2e | 3373 | BUG_ON(end < cur); |
40f76580 | 3374 | iosize = min(em_end - cur, end - cur + 1); |
fda2832f | 3375 | iosize = ALIGN(iosize, blocksize); |
d1310b2e CM |
3376 | sector = (em->block_start + extent_offset) >> 9; |
3377 | bdev = em->bdev; | |
3378 | block_start = em->block_start; | |
c8b97818 | 3379 | compressed = test_bit(EXTENT_FLAG_COMPRESSED, &em->flags); |
d1310b2e CM |
3380 | free_extent_map(em); |
3381 | em = NULL; | |
3382 | ||
c8b97818 CM |
3383 | /* |
3384 | * compressed and inline extents are written through other | |
3385 | * paths in the FS | |
3386 | */ | |
3387 | if (compressed || block_start == EXTENT_MAP_HOLE || | |
d1310b2e | 3388 | block_start == EXTENT_MAP_INLINE) { |
c8b97818 CM |
3389 | /* |
3390 | * end_io notification does not happen here for | |
3391 | * compressed extents | |
3392 | */ | |
3393 | if (!compressed && tree->ops && | |
3394 | tree->ops->writepage_end_io_hook) | |
e6dcd2dc CM |
3395 | tree->ops->writepage_end_io_hook(page, cur, |
3396 | cur + iosize - 1, | |
3397 | NULL, 1); | |
c8b97818 CM |
3398 | else if (compressed) { |
3399 | /* we don't want to end_page_writeback on | |
3400 | * a compressed extent. this happens | |
3401 | * elsewhere | |
3402 | */ | |
3403 | nr++; | |
3404 | } | |
3405 | ||
3406 | cur += iosize; | |
7f3c74fb | 3407 | pg_offset += iosize; |
d1310b2e CM |
3408 | continue; |
3409 | } | |
c8b97818 | 3410 | |
d1310b2e CM |
3411 | if (tree->ops && tree->ops->writepage_io_hook) { |
3412 | ret = tree->ops->writepage_io_hook(page, cur, | |
3413 | cur + iosize - 1); | |
3414 | } else { | |
3415 | ret = 0; | |
3416 | } | |
1259ab75 | 3417 | if (ret) { |
d1310b2e | 3418 | SetPageError(page); |
1259ab75 | 3419 | } else { |
40f76580 | 3420 | unsigned long max_nr = (i_size >> PAGE_CACHE_SHIFT) + 1; |
7f3c74fb | 3421 | |
d1310b2e CM |
3422 | set_range_writeback(tree, cur, cur + iosize - 1); |
3423 | if (!PageWriteback(page)) { | |
efe120a0 FH |
3424 | btrfs_err(BTRFS_I(inode)->root->fs_info, |
3425 | "page %lu not writeback, cur %llu end %llu", | |
c1c9ff7c | 3426 | page->index, cur, end); |
d1310b2e CM |
3427 | } |
3428 | ||
ffbd517d CM |
3429 | ret = submit_extent_page(write_flags, tree, page, |
3430 | sector, iosize, pg_offset, | |
3431 | bdev, &epd->bio, max_nr, | |
c8b97818 CM |
3432 | end_bio_extent_writepage, |
3433 | 0, 0, 0); | |
d1310b2e CM |
3434 | if (ret) |
3435 | SetPageError(page); | |
3436 | } | |
3437 | cur = cur + iosize; | |
7f3c74fb | 3438 | pg_offset += iosize; |
d1310b2e CM |
3439 | nr++; |
3440 | } | |
40f76580 CM |
3441 | done: |
3442 | *nr_ret = nr; | |
3443 | ||
3444 | done_unlocked: | |
3445 | ||
3446 | /* drop our reference on any cached states */ | |
3447 | free_extent_state(cached_state); | |
3448 | return ret; | |
3449 | } | |
3450 | ||
3451 | /* | |
3452 | * the writepage semantics are similar to regular writepage. extent | |
3453 | * records are inserted to lock ranges in the tree, and as dirty areas | |
3454 | * are found, they are marked writeback. Then the lock bits are removed | |
3455 | * and the end_io handler clears the writeback ranges | |
3456 | */ | |
3457 | static int __extent_writepage(struct page *page, struct writeback_control *wbc, | |
3458 | void *data) | |
3459 | { | |
3460 | struct inode *inode = page->mapping->host; | |
3461 | struct extent_page_data *epd = data; | |
3462 | u64 start = page_offset(page); | |
3463 | u64 page_end = start + PAGE_CACHE_SIZE - 1; | |
3464 | int ret; | |
3465 | int nr = 0; | |
3466 | size_t pg_offset = 0; | |
3467 | loff_t i_size = i_size_read(inode); | |
3468 | unsigned long end_index = i_size >> PAGE_CACHE_SHIFT; | |
3469 | int write_flags; | |
3470 | unsigned long nr_written = 0; | |
3471 | ||
3472 | if (wbc->sync_mode == WB_SYNC_ALL) | |
3473 | write_flags = WRITE_SYNC; | |
3474 | else | |
3475 | write_flags = WRITE; | |
3476 | ||
3477 | trace___extent_writepage(page, inode, wbc); | |
3478 | ||
3479 | WARN_ON(!PageLocked(page)); | |
3480 | ||
3481 | ClearPageError(page); | |
3482 | ||
3483 | pg_offset = i_size & (PAGE_CACHE_SIZE - 1); | |
3484 | if (page->index > end_index || | |
3485 | (page->index == end_index && !pg_offset)) { | |
3486 | page->mapping->a_ops->invalidatepage(page, 0, PAGE_CACHE_SIZE); | |
3487 | unlock_page(page); | |
3488 | return 0; | |
3489 | } | |
3490 | ||
3491 | if (page->index == end_index) { | |
3492 | char *userpage; | |
3493 | ||
3494 | userpage = kmap_atomic(page); | |
3495 | memset(userpage + pg_offset, 0, | |
3496 | PAGE_CACHE_SIZE - pg_offset); | |
3497 | kunmap_atomic(userpage); | |
3498 | flush_dcache_page(page); | |
3499 | } | |
3500 | ||
3501 | pg_offset = 0; | |
3502 | ||
3503 | set_page_extent_mapped(page); | |
3504 | ||
3505 | ret = writepage_delalloc(inode, page, wbc, epd, start, &nr_written); | |
3506 | if (ret == 1) | |
3507 | goto done_unlocked; | |
3508 | if (ret) | |
3509 | goto done; | |
3510 | ||
3511 | ret = __extent_writepage_io(inode, page, wbc, epd, | |
3512 | i_size, nr_written, write_flags, &nr); | |
3513 | if (ret == 1) | |
3514 | goto done_unlocked; | |
3515 | ||
d1310b2e CM |
3516 | done: |
3517 | if (nr == 0) { | |
3518 | /* make sure the mapping tag for page dirty gets cleared */ | |
3519 | set_page_writeback(page); | |
3520 | end_page_writeback(page); | |
3521 | } | |
61391d56 FM |
3522 | if (PageError(page)) { |
3523 | ret = ret < 0 ? ret : -EIO; | |
3524 | end_extent_writepage(page, ret, start, page_end); | |
3525 | } | |
d1310b2e | 3526 | unlock_page(page); |
40f76580 | 3527 | return ret; |
771ed689 | 3528 | |
11c8349b | 3529 | done_unlocked: |
d1310b2e CM |
3530 | return 0; |
3531 | } | |
3532 | ||
fd8b2b61 | 3533 | void wait_on_extent_buffer_writeback(struct extent_buffer *eb) |
0b32f4bb | 3534 | { |
74316201 N |
3535 | wait_on_bit_io(&eb->bflags, EXTENT_BUFFER_WRITEBACK, |
3536 | TASK_UNINTERRUPTIBLE); | |
0b32f4bb JB |
3537 | } |
3538 | ||
0e378df1 CM |
3539 | static noinline_for_stack int |
3540 | lock_extent_buffer_for_io(struct extent_buffer *eb, | |
3541 | struct btrfs_fs_info *fs_info, | |
3542 | struct extent_page_data *epd) | |
0b32f4bb JB |
3543 | { |
3544 | unsigned long i, num_pages; | |
3545 | int flush = 0; | |
3546 | int ret = 0; | |
3547 | ||
3548 | if (!btrfs_try_tree_write_lock(eb)) { | |
3549 | flush = 1; | |
3550 | flush_write_bio(epd); | |
3551 | btrfs_tree_lock(eb); | |
3552 | } | |
3553 | ||
3554 | if (test_bit(EXTENT_BUFFER_WRITEBACK, &eb->bflags)) { | |
3555 | btrfs_tree_unlock(eb); | |
3556 | if (!epd->sync_io) | |
3557 | return 0; | |
3558 | if (!flush) { | |
3559 | flush_write_bio(epd); | |
3560 | flush = 1; | |
3561 | } | |
a098d8e8 CM |
3562 | while (1) { |
3563 | wait_on_extent_buffer_writeback(eb); | |
3564 | btrfs_tree_lock(eb); | |
3565 | if (!test_bit(EXTENT_BUFFER_WRITEBACK, &eb->bflags)) | |
3566 | break; | |
0b32f4bb | 3567 | btrfs_tree_unlock(eb); |
0b32f4bb JB |
3568 | } |
3569 | } | |
3570 | ||
51561ffe JB |
3571 | /* |
3572 | * We need to do this to prevent races in people who check if the eb is | |
3573 | * under IO since we can end up having no IO bits set for a short period | |
3574 | * of time. | |
3575 | */ | |
3576 | spin_lock(&eb->refs_lock); | |
0b32f4bb JB |
3577 | if (test_and_clear_bit(EXTENT_BUFFER_DIRTY, &eb->bflags)) { |
3578 | set_bit(EXTENT_BUFFER_WRITEBACK, &eb->bflags); | |
51561ffe | 3579 | spin_unlock(&eb->refs_lock); |
0b32f4bb | 3580 | btrfs_set_header_flag(eb, BTRFS_HEADER_FLAG_WRITTEN); |
e2d84521 MX |
3581 | __percpu_counter_add(&fs_info->dirty_metadata_bytes, |
3582 | -eb->len, | |
3583 | fs_info->dirty_metadata_batch); | |
0b32f4bb | 3584 | ret = 1; |
51561ffe JB |
3585 | } else { |
3586 | spin_unlock(&eb->refs_lock); | |
0b32f4bb JB |
3587 | } |
3588 | ||
3589 | btrfs_tree_unlock(eb); | |
3590 | ||
3591 | if (!ret) | |
3592 | return ret; | |
3593 | ||
3594 | num_pages = num_extent_pages(eb->start, eb->len); | |
3595 | for (i = 0; i < num_pages; i++) { | |
fb85fc9a | 3596 | struct page *p = eb->pages[i]; |
0b32f4bb JB |
3597 | |
3598 | if (!trylock_page(p)) { | |
3599 | if (!flush) { | |
3600 | flush_write_bio(epd); | |
3601 | flush = 1; | |
3602 | } | |
3603 | lock_page(p); | |
3604 | } | |
3605 | } | |
3606 | ||
3607 | return ret; | |
3608 | } | |
3609 | ||
3610 | static void end_extent_buffer_writeback(struct extent_buffer *eb) | |
3611 | { | |
3612 | clear_bit(EXTENT_BUFFER_WRITEBACK, &eb->bflags); | |
4e857c58 | 3613 | smp_mb__after_atomic(); |
0b32f4bb JB |
3614 | wake_up_bit(&eb->bflags, EXTENT_BUFFER_WRITEBACK); |
3615 | } | |
3616 | ||
656f30db FM |
3617 | static void set_btree_ioerr(struct page *page) |
3618 | { | |
3619 | struct extent_buffer *eb = (struct extent_buffer *)page->private; | |
3620 | struct btrfs_inode *btree_ino = BTRFS_I(eb->fs_info->btree_inode); | |
3621 | ||
3622 | SetPageError(page); | |
3623 | if (test_and_set_bit(EXTENT_BUFFER_WRITE_ERR, &eb->bflags)) | |
3624 | return; | |
3625 | ||
3626 | /* | |
3627 | * If writeback for a btree extent that doesn't belong to a log tree | |
3628 | * failed, increment the counter transaction->eb_write_errors. | |
3629 | * We do this because while the transaction is running and before it's | |
3630 | * committing (when we call filemap_fdata[write|wait]_range against | |
3631 | * the btree inode), we might have | |
3632 | * btree_inode->i_mapping->a_ops->writepages() called by the VM - if it | |
3633 | * returns an error or an error happens during writeback, when we're | |
3634 | * committing the transaction we wouldn't know about it, since the pages | |
3635 | * can be no longer dirty nor marked anymore for writeback (if a | |
3636 | * subsequent modification to the extent buffer didn't happen before the | |
3637 | * transaction commit), which makes filemap_fdata[write|wait]_range not | |
3638 | * able to find the pages tagged with SetPageError at transaction | |
3639 | * commit time. So if this happens we must abort the transaction, | |
3640 | * otherwise we commit a super block with btree roots that point to | |
3641 | * btree nodes/leafs whose content on disk is invalid - either garbage | |
3642 | * or the content of some node/leaf from a past generation that got | |
3643 | * cowed or deleted and is no longer valid. | |
3644 | * | |
3645 | * Note: setting AS_EIO/AS_ENOSPC in the btree inode's i_mapping would | |
3646 | * not be enough - we need to distinguish between log tree extents vs | |
3647 | * non-log tree extents, and the next filemap_fdatawait_range() call | |
3648 | * will catch and clear such errors in the mapping - and that call might | |
3649 | * be from a log sync and not from a transaction commit. Also, checking | |
3650 | * for the eb flag EXTENT_BUFFER_WRITE_ERR at transaction commit time is | |
3651 | * not done and would not be reliable - the eb might have been released | |
3652 | * from memory and reading it back again means that flag would not be | |
3653 | * set (since it's a runtime flag, not persisted on disk). | |
3654 | * | |
3655 | * Using the flags below in the btree inode also makes us achieve the | |
3656 | * goal of AS_EIO/AS_ENOSPC when writepages() returns success, started | |
3657 | * writeback for all dirty pages and before filemap_fdatawait_range() | |
3658 | * is called, the writeback for all dirty pages had already finished | |
3659 | * with errors - because we were not using AS_EIO/AS_ENOSPC, | |
3660 | * filemap_fdatawait_range() would return success, as it could not know | |
3661 | * that writeback errors happened (the pages were no longer tagged for | |
3662 | * writeback). | |
3663 | */ | |
3664 | switch (eb->log_index) { | |
3665 | case -1: | |
3666 | set_bit(BTRFS_INODE_BTREE_ERR, &btree_ino->runtime_flags); | |
3667 | break; | |
3668 | case 0: | |
3669 | set_bit(BTRFS_INODE_BTREE_LOG1_ERR, &btree_ino->runtime_flags); | |
3670 | break; | |
3671 | case 1: | |
3672 | set_bit(BTRFS_INODE_BTREE_LOG2_ERR, &btree_ino->runtime_flags); | |
3673 | break; | |
3674 | default: | |
3675 | BUG(); /* unexpected, logic error */ | |
3676 | } | |
3677 | } | |
3678 | ||
0b32f4bb JB |
3679 | static void end_bio_extent_buffer_writepage(struct bio *bio, int err) |
3680 | { | |
2c30c71b | 3681 | struct bio_vec *bvec; |
0b32f4bb | 3682 | struct extent_buffer *eb; |
2c30c71b | 3683 | int i, done; |
0b32f4bb | 3684 | |
2c30c71b | 3685 | bio_for_each_segment_all(bvec, bio, i) { |
0b32f4bb JB |
3686 | struct page *page = bvec->bv_page; |
3687 | ||
0b32f4bb JB |
3688 | eb = (struct extent_buffer *)page->private; |
3689 | BUG_ON(!eb); | |
3690 | done = atomic_dec_and_test(&eb->io_pages); | |
3691 | ||
656f30db | 3692 | if (err || test_bit(EXTENT_BUFFER_WRITE_ERR, &eb->bflags)) { |
0b32f4bb | 3693 | ClearPageUptodate(page); |
656f30db | 3694 | set_btree_ioerr(page); |
0b32f4bb JB |
3695 | } |
3696 | ||
3697 | end_page_writeback(page); | |
3698 | ||
3699 | if (!done) | |
3700 | continue; | |
3701 | ||
3702 | end_extent_buffer_writeback(eb); | |
2c30c71b | 3703 | } |
0b32f4bb JB |
3704 | |
3705 | bio_put(bio); | |
0b32f4bb JB |
3706 | } |
3707 | ||
0e378df1 | 3708 | static noinline_for_stack int write_one_eb(struct extent_buffer *eb, |
0b32f4bb JB |
3709 | struct btrfs_fs_info *fs_info, |
3710 | struct writeback_control *wbc, | |
3711 | struct extent_page_data *epd) | |
3712 | { | |
3713 | struct block_device *bdev = fs_info->fs_devices->latest_bdev; | |
f28491e0 | 3714 | struct extent_io_tree *tree = &BTRFS_I(fs_info->btree_inode)->io_tree; |
0b32f4bb JB |
3715 | u64 offset = eb->start; |
3716 | unsigned long i, num_pages; | |
de0022b9 | 3717 | unsigned long bio_flags = 0; |
d4c7ca86 | 3718 | int rw = (epd->sync_io ? WRITE_SYNC : WRITE) | REQ_META; |
d7dbe9e7 | 3719 | int ret = 0; |
0b32f4bb | 3720 | |
656f30db | 3721 | clear_bit(EXTENT_BUFFER_WRITE_ERR, &eb->bflags); |
0b32f4bb JB |
3722 | num_pages = num_extent_pages(eb->start, eb->len); |
3723 | atomic_set(&eb->io_pages, num_pages); | |
de0022b9 JB |
3724 | if (btrfs_header_owner(eb) == BTRFS_TREE_LOG_OBJECTID) |
3725 | bio_flags = EXTENT_BIO_TREE_LOG; | |
3726 | ||
0b32f4bb | 3727 | for (i = 0; i < num_pages; i++) { |
fb85fc9a | 3728 | struct page *p = eb->pages[i]; |
0b32f4bb JB |
3729 | |
3730 | clear_page_dirty_for_io(p); | |
3731 | set_page_writeback(p); | |
f28491e0 | 3732 | ret = submit_extent_page(rw, tree, p, offset >> 9, |
0b32f4bb JB |
3733 | PAGE_CACHE_SIZE, 0, bdev, &epd->bio, |
3734 | -1, end_bio_extent_buffer_writepage, | |
de0022b9 JB |
3735 | 0, epd->bio_flags, bio_flags); |
3736 | epd->bio_flags = bio_flags; | |
0b32f4bb | 3737 | if (ret) { |
656f30db | 3738 | set_btree_ioerr(p); |
55e3bd2e | 3739 | end_page_writeback(p); |
0b32f4bb JB |
3740 | if (atomic_sub_and_test(num_pages - i, &eb->io_pages)) |
3741 | end_extent_buffer_writeback(eb); | |
3742 | ret = -EIO; | |
3743 | break; | |
3744 | } | |
3745 | offset += PAGE_CACHE_SIZE; | |
3746 | update_nr_written(p, wbc, 1); | |
3747 | unlock_page(p); | |
3748 | } | |
3749 | ||
3750 | if (unlikely(ret)) { | |
3751 | for (; i < num_pages; i++) { | |
bbf65cf0 | 3752 | struct page *p = eb->pages[i]; |
81465028 | 3753 | clear_page_dirty_for_io(p); |
0b32f4bb JB |
3754 | unlock_page(p); |
3755 | } | |
3756 | } | |
3757 | ||
3758 | return ret; | |
3759 | } | |
3760 | ||
3761 | int btree_write_cache_pages(struct address_space *mapping, | |
3762 | struct writeback_control *wbc) | |
3763 | { | |
3764 | struct extent_io_tree *tree = &BTRFS_I(mapping->host)->io_tree; | |
3765 | struct btrfs_fs_info *fs_info = BTRFS_I(mapping->host)->root->fs_info; | |
3766 | struct extent_buffer *eb, *prev_eb = NULL; | |
3767 | struct extent_page_data epd = { | |
3768 | .bio = NULL, | |
3769 | .tree = tree, | |
3770 | .extent_locked = 0, | |
3771 | .sync_io = wbc->sync_mode == WB_SYNC_ALL, | |
de0022b9 | 3772 | .bio_flags = 0, |
0b32f4bb JB |
3773 | }; |
3774 | int ret = 0; | |
3775 | int done = 0; | |
3776 | int nr_to_write_done = 0; | |
3777 | struct pagevec pvec; | |
3778 | int nr_pages; | |
3779 | pgoff_t index; | |
3780 | pgoff_t end; /* Inclusive */ | |
3781 | int scanned = 0; | |
3782 | int tag; | |
3783 | ||
3784 | pagevec_init(&pvec, 0); | |
3785 | if (wbc->range_cyclic) { | |
3786 | index = mapping->writeback_index; /* Start from prev offset */ | |
3787 | end = -1; | |
3788 | } else { | |
3789 | index = wbc->range_start >> PAGE_CACHE_SHIFT; | |
3790 | end = wbc->range_end >> PAGE_CACHE_SHIFT; | |
3791 | scanned = 1; | |
3792 | } | |
3793 | if (wbc->sync_mode == WB_SYNC_ALL) | |
3794 | tag = PAGECACHE_TAG_TOWRITE; | |
3795 | else | |
3796 | tag = PAGECACHE_TAG_DIRTY; | |
3797 | retry: | |
3798 | if (wbc->sync_mode == WB_SYNC_ALL) | |
3799 | tag_pages_for_writeback(mapping, index, end); | |
3800 | while (!done && !nr_to_write_done && (index <= end) && | |
3801 | (nr_pages = pagevec_lookup_tag(&pvec, mapping, &index, tag, | |
3802 | min(end - index, (pgoff_t)PAGEVEC_SIZE-1) + 1))) { | |
3803 | unsigned i; | |
3804 | ||
3805 | scanned = 1; | |
3806 | for (i = 0; i < nr_pages; i++) { | |
3807 | struct page *page = pvec.pages[i]; | |
3808 | ||
3809 | if (!PagePrivate(page)) | |
3810 | continue; | |
3811 | ||
3812 | if (!wbc->range_cyclic && page->index > end) { | |
3813 | done = 1; | |
3814 | break; | |
3815 | } | |
3816 | ||
b5bae261 JB |
3817 | spin_lock(&mapping->private_lock); |
3818 | if (!PagePrivate(page)) { | |
3819 | spin_unlock(&mapping->private_lock); | |
3820 | continue; | |
3821 | } | |
3822 | ||
0b32f4bb | 3823 | eb = (struct extent_buffer *)page->private; |
b5bae261 JB |
3824 | |
3825 | /* | |
3826 | * Shouldn't happen and normally this would be a BUG_ON | |
3827 | * but no sense in crashing the users box for something | |
3828 | * we can survive anyway. | |
3829 | */ | |
fae7f21c | 3830 | if (WARN_ON(!eb)) { |
b5bae261 | 3831 | spin_unlock(&mapping->private_lock); |
0b32f4bb JB |
3832 | continue; |
3833 | } | |
3834 | ||
b5bae261 JB |
3835 | if (eb == prev_eb) { |
3836 | spin_unlock(&mapping->private_lock); | |
0b32f4bb | 3837 | continue; |
b5bae261 | 3838 | } |
0b32f4bb | 3839 | |
b5bae261 JB |
3840 | ret = atomic_inc_not_zero(&eb->refs); |
3841 | spin_unlock(&mapping->private_lock); | |
3842 | if (!ret) | |
0b32f4bb | 3843 | continue; |
0b32f4bb JB |
3844 | |
3845 | prev_eb = eb; | |
3846 | ret = lock_extent_buffer_for_io(eb, fs_info, &epd); | |
3847 | if (!ret) { | |
3848 | free_extent_buffer(eb); | |
3849 | continue; | |
3850 | } | |
3851 | ||
3852 | ret = write_one_eb(eb, fs_info, wbc, &epd); | |
3853 | if (ret) { | |
3854 | done = 1; | |
3855 | free_extent_buffer(eb); | |
3856 | break; | |
3857 | } | |
3858 | free_extent_buffer(eb); | |
3859 | ||
3860 | /* | |
3861 | * the filesystem may choose to bump up nr_to_write. | |
3862 | * We have to make sure to honor the new nr_to_write | |
3863 | * at any time | |
3864 | */ | |
3865 | nr_to_write_done = wbc->nr_to_write <= 0; | |
3866 | } | |
3867 | pagevec_release(&pvec); | |
3868 | cond_resched(); | |
3869 | } | |
3870 | if (!scanned && !done) { | |
3871 | /* | |
3872 | * We hit the last page and there is more work to be done: wrap | |
3873 | * back to the start of the file | |
3874 | */ | |
3875 | scanned = 1; | |
3876 | index = 0; | |
3877 | goto retry; | |
3878 | } | |
3879 | flush_write_bio(&epd); | |
3880 | return ret; | |
3881 | } | |
3882 | ||
d1310b2e | 3883 | /** |
4bef0848 | 3884 | * write_cache_pages - walk the list of dirty pages of the given address space and write all of them. |
d1310b2e CM |
3885 | * @mapping: address space structure to write |
3886 | * @wbc: subtract the number of written pages from *@wbc->nr_to_write | |
3887 | * @writepage: function called for each page | |
3888 | * @data: data passed to writepage function | |
3889 | * | |
3890 | * If a page is already under I/O, write_cache_pages() skips it, even | |
3891 | * if it's dirty. This is desirable behaviour for memory-cleaning writeback, | |
3892 | * but it is INCORRECT for data-integrity system calls such as fsync(). fsync() | |
3893 | * and msync() need to guarantee that all the data which was dirty at the time | |
3894 | * the call was made get new I/O started against them. If wbc->sync_mode is | |
3895 | * WB_SYNC_ALL then we were called for data integrity and we must wait for | |
3896 | * existing IO to complete. | |
3897 | */ | |
b2950863 | 3898 | static int extent_write_cache_pages(struct extent_io_tree *tree, |
4bef0848 CM |
3899 | struct address_space *mapping, |
3900 | struct writeback_control *wbc, | |
d2c3f4f6 CM |
3901 | writepage_t writepage, void *data, |
3902 | void (*flush_fn)(void *)) | |
d1310b2e | 3903 | { |
7fd1a3f7 | 3904 | struct inode *inode = mapping->host; |
d1310b2e CM |
3905 | int ret = 0; |
3906 | int done = 0; | |
61391d56 | 3907 | int err = 0; |
f85d7d6c | 3908 | int nr_to_write_done = 0; |
d1310b2e CM |
3909 | struct pagevec pvec; |
3910 | int nr_pages; | |
3911 | pgoff_t index; | |
3912 | pgoff_t end; /* Inclusive */ | |
3913 | int scanned = 0; | |
f7aaa06b | 3914 | int tag; |
d1310b2e | 3915 | |
7fd1a3f7 JB |
3916 | /* |
3917 | * We have to hold onto the inode so that ordered extents can do their | |
3918 | * work when the IO finishes. The alternative to this is failing to add | |
3919 | * an ordered extent if the igrab() fails there and that is a huge pain | |
3920 | * to deal with, so instead just hold onto the inode throughout the | |
3921 | * writepages operation. If it fails here we are freeing up the inode | |
3922 | * anyway and we'd rather not waste our time writing out stuff that is | |
3923 | * going to be truncated anyway. | |
3924 | */ | |
3925 | if (!igrab(inode)) | |
3926 | return 0; | |
3927 | ||
d1310b2e CM |
3928 | pagevec_init(&pvec, 0); |
3929 | if (wbc->range_cyclic) { | |
3930 | index = mapping->writeback_index; /* Start from prev offset */ | |
3931 | end = -1; | |
3932 | } else { | |
3933 | index = wbc->range_start >> PAGE_CACHE_SHIFT; | |
3934 | end = wbc->range_end >> PAGE_CACHE_SHIFT; | |
d1310b2e CM |
3935 | scanned = 1; |
3936 | } | |
f7aaa06b JB |
3937 | if (wbc->sync_mode == WB_SYNC_ALL) |
3938 | tag = PAGECACHE_TAG_TOWRITE; | |
3939 | else | |
3940 | tag = PAGECACHE_TAG_DIRTY; | |
d1310b2e | 3941 | retry: |
f7aaa06b JB |
3942 | if (wbc->sync_mode == WB_SYNC_ALL) |
3943 | tag_pages_for_writeback(mapping, index, end); | |
f85d7d6c | 3944 | while (!done && !nr_to_write_done && (index <= end) && |
f7aaa06b JB |
3945 | (nr_pages = pagevec_lookup_tag(&pvec, mapping, &index, tag, |
3946 | min(end - index, (pgoff_t)PAGEVEC_SIZE-1) + 1))) { | |
d1310b2e CM |
3947 | unsigned i; |
3948 | ||
3949 | scanned = 1; | |
3950 | for (i = 0; i < nr_pages; i++) { | |
3951 | struct page *page = pvec.pages[i]; | |
3952 | ||
3953 | /* | |
3954 | * At this point we hold neither mapping->tree_lock nor | |
3955 | * lock on the page itself: the page may be truncated or | |
3956 | * invalidated (changing page->mapping to NULL), or even | |
3957 | * swizzled back from swapper_space to tmpfs file | |
3958 | * mapping | |
3959 | */ | |
c8f2f24b JB |
3960 | if (!trylock_page(page)) { |
3961 | flush_fn(data); | |
3962 | lock_page(page); | |
01d658f2 | 3963 | } |
d1310b2e CM |
3964 | |
3965 | if (unlikely(page->mapping != mapping)) { | |
3966 | unlock_page(page); | |
3967 | continue; | |
3968 | } | |
3969 | ||
3970 | if (!wbc->range_cyclic && page->index > end) { | |
3971 | done = 1; | |
3972 | unlock_page(page); | |
3973 | continue; | |
3974 | } | |
3975 | ||
d2c3f4f6 | 3976 | if (wbc->sync_mode != WB_SYNC_NONE) { |
0e6bd956 CM |
3977 | if (PageWriteback(page)) |
3978 | flush_fn(data); | |
d1310b2e | 3979 | wait_on_page_writeback(page); |
d2c3f4f6 | 3980 | } |
d1310b2e CM |
3981 | |
3982 | if (PageWriteback(page) || | |
3983 | !clear_page_dirty_for_io(page)) { | |
3984 | unlock_page(page); | |
3985 | continue; | |
3986 | } | |
3987 | ||
3988 | ret = (*writepage)(page, wbc, data); | |
3989 | ||
3990 | if (unlikely(ret == AOP_WRITEPAGE_ACTIVATE)) { | |
3991 | unlock_page(page); | |
3992 | ret = 0; | |
3993 | } | |
61391d56 FM |
3994 | if (!err && ret < 0) |
3995 | err = ret; | |
f85d7d6c CM |
3996 | |
3997 | /* | |
3998 | * the filesystem may choose to bump up nr_to_write. | |
3999 | * We have to make sure to honor the new nr_to_write | |
4000 | * at any time | |
4001 | */ | |
4002 | nr_to_write_done = wbc->nr_to_write <= 0; | |
d1310b2e CM |
4003 | } |
4004 | pagevec_release(&pvec); | |
4005 | cond_resched(); | |
4006 | } | |
61391d56 | 4007 | if (!scanned && !done && !err) { |
d1310b2e CM |
4008 | /* |
4009 | * We hit the last page and there is more work to be done: wrap | |
4010 | * back to the start of the file | |
4011 | */ | |
4012 | scanned = 1; | |
4013 | index = 0; | |
4014 | goto retry; | |
4015 | } | |
7fd1a3f7 | 4016 | btrfs_add_delayed_iput(inode); |
61391d56 | 4017 | return err; |
d1310b2e | 4018 | } |
d1310b2e | 4019 | |
ffbd517d | 4020 | static void flush_epd_write_bio(struct extent_page_data *epd) |
d2c3f4f6 | 4021 | { |
d2c3f4f6 | 4022 | if (epd->bio) { |
355808c2 JM |
4023 | int rw = WRITE; |
4024 | int ret; | |
4025 | ||
ffbd517d | 4026 | if (epd->sync_io) |
355808c2 JM |
4027 | rw = WRITE_SYNC; |
4028 | ||
de0022b9 | 4029 | ret = submit_one_bio(rw, epd->bio, 0, epd->bio_flags); |
79787eaa | 4030 | BUG_ON(ret < 0); /* -ENOMEM */ |
d2c3f4f6 CM |
4031 | epd->bio = NULL; |
4032 | } | |
4033 | } | |
4034 | ||
ffbd517d CM |
4035 | static noinline void flush_write_bio(void *data) |
4036 | { | |
4037 | struct extent_page_data *epd = data; | |
4038 | flush_epd_write_bio(epd); | |
4039 | } | |
4040 | ||
d1310b2e CM |
4041 | int extent_write_full_page(struct extent_io_tree *tree, struct page *page, |
4042 | get_extent_t *get_extent, | |
4043 | struct writeback_control *wbc) | |
4044 | { | |
4045 | int ret; | |
d1310b2e CM |
4046 | struct extent_page_data epd = { |
4047 | .bio = NULL, | |
4048 | .tree = tree, | |
4049 | .get_extent = get_extent, | |
771ed689 | 4050 | .extent_locked = 0, |
ffbd517d | 4051 | .sync_io = wbc->sync_mode == WB_SYNC_ALL, |
de0022b9 | 4052 | .bio_flags = 0, |
d1310b2e | 4053 | }; |
d1310b2e | 4054 | |
d1310b2e CM |
4055 | ret = __extent_writepage(page, wbc, &epd); |
4056 | ||
ffbd517d | 4057 | flush_epd_write_bio(&epd); |
d1310b2e CM |
4058 | return ret; |
4059 | } | |
d1310b2e | 4060 | |
771ed689 CM |
4061 | int extent_write_locked_range(struct extent_io_tree *tree, struct inode *inode, |
4062 | u64 start, u64 end, get_extent_t *get_extent, | |
4063 | int mode) | |
4064 | { | |
4065 | int ret = 0; | |
4066 | struct address_space *mapping = inode->i_mapping; | |
4067 | struct page *page; | |
4068 | unsigned long nr_pages = (end - start + PAGE_CACHE_SIZE) >> | |
4069 | PAGE_CACHE_SHIFT; | |
4070 | ||
4071 | struct extent_page_data epd = { | |
4072 | .bio = NULL, | |
4073 | .tree = tree, | |
4074 | .get_extent = get_extent, | |
4075 | .extent_locked = 1, | |
ffbd517d | 4076 | .sync_io = mode == WB_SYNC_ALL, |
de0022b9 | 4077 | .bio_flags = 0, |
771ed689 CM |
4078 | }; |
4079 | struct writeback_control wbc_writepages = { | |
771ed689 | 4080 | .sync_mode = mode, |
771ed689 CM |
4081 | .nr_to_write = nr_pages * 2, |
4082 | .range_start = start, | |
4083 | .range_end = end + 1, | |
4084 | }; | |
4085 | ||
d397712b | 4086 | while (start <= end) { |
771ed689 CM |
4087 | page = find_get_page(mapping, start >> PAGE_CACHE_SHIFT); |
4088 | if (clear_page_dirty_for_io(page)) | |
4089 | ret = __extent_writepage(page, &wbc_writepages, &epd); | |
4090 | else { | |
4091 | if (tree->ops && tree->ops->writepage_end_io_hook) | |
4092 | tree->ops->writepage_end_io_hook(page, start, | |
4093 | start + PAGE_CACHE_SIZE - 1, | |
4094 | NULL, 1); | |
4095 | unlock_page(page); | |
4096 | } | |
4097 | page_cache_release(page); | |
4098 | start += PAGE_CACHE_SIZE; | |
4099 | } | |
4100 | ||
ffbd517d | 4101 | flush_epd_write_bio(&epd); |
771ed689 CM |
4102 | return ret; |
4103 | } | |
d1310b2e CM |
4104 | |
4105 | int extent_writepages(struct extent_io_tree *tree, | |
4106 | struct address_space *mapping, | |
4107 | get_extent_t *get_extent, | |
4108 | struct writeback_control *wbc) | |
4109 | { | |
4110 | int ret = 0; | |
4111 | struct extent_page_data epd = { | |
4112 | .bio = NULL, | |
4113 | .tree = tree, | |
4114 | .get_extent = get_extent, | |
771ed689 | 4115 | .extent_locked = 0, |
ffbd517d | 4116 | .sync_io = wbc->sync_mode == WB_SYNC_ALL, |
de0022b9 | 4117 | .bio_flags = 0, |
d1310b2e CM |
4118 | }; |
4119 | ||
4bef0848 | 4120 | ret = extent_write_cache_pages(tree, mapping, wbc, |
d2c3f4f6 CM |
4121 | __extent_writepage, &epd, |
4122 | flush_write_bio); | |
ffbd517d | 4123 | flush_epd_write_bio(&epd); |
d1310b2e CM |
4124 | return ret; |
4125 | } | |
d1310b2e CM |
4126 | |
4127 | int extent_readpages(struct extent_io_tree *tree, | |
4128 | struct address_space *mapping, | |
4129 | struct list_head *pages, unsigned nr_pages, | |
4130 | get_extent_t get_extent) | |
4131 | { | |
4132 | struct bio *bio = NULL; | |
4133 | unsigned page_idx; | |
c8b97818 | 4134 | unsigned long bio_flags = 0; |
67c9684f LB |
4135 | struct page *pagepool[16]; |
4136 | struct page *page; | |
125bac01 | 4137 | struct extent_map *em_cached = NULL; |
67c9684f | 4138 | int nr = 0; |
d1310b2e | 4139 | |
d1310b2e | 4140 | for (page_idx = 0; page_idx < nr_pages; page_idx++) { |
67c9684f | 4141 | page = list_entry(pages->prev, struct page, lru); |
d1310b2e CM |
4142 | |
4143 | prefetchw(&page->flags); | |
4144 | list_del(&page->lru); | |
67c9684f | 4145 | if (add_to_page_cache_lru(page, mapping, |
43e817a1 | 4146 | page->index, GFP_NOFS)) { |
67c9684f LB |
4147 | page_cache_release(page); |
4148 | continue; | |
d1310b2e | 4149 | } |
67c9684f LB |
4150 | |
4151 | pagepool[nr++] = page; | |
4152 | if (nr < ARRAY_SIZE(pagepool)) | |
4153 | continue; | |
125bac01 | 4154 | __extent_readpages(tree, pagepool, nr, get_extent, &em_cached, |
9974090b | 4155 | &bio, 0, &bio_flags, READ); |
67c9684f | 4156 | nr = 0; |
d1310b2e | 4157 | } |
9974090b | 4158 | if (nr) |
125bac01 | 4159 | __extent_readpages(tree, pagepool, nr, get_extent, &em_cached, |
9974090b | 4160 | &bio, 0, &bio_flags, READ); |
67c9684f | 4161 | |
125bac01 MX |
4162 | if (em_cached) |
4163 | free_extent_map(em_cached); | |
4164 | ||
d1310b2e CM |
4165 | BUG_ON(!list_empty(pages)); |
4166 | if (bio) | |
79787eaa | 4167 | return submit_one_bio(READ, bio, 0, bio_flags); |
d1310b2e CM |
4168 | return 0; |
4169 | } | |
d1310b2e CM |
4170 | |
4171 | /* | |
4172 | * basic invalidatepage code, this waits on any locked or writeback | |
4173 | * ranges corresponding to the page, and then deletes any extent state | |
4174 | * records from the tree | |
4175 | */ | |
4176 | int extent_invalidatepage(struct extent_io_tree *tree, | |
4177 | struct page *page, unsigned long offset) | |
4178 | { | |
2ac55d41 | 4179 | struct extent_state *cached_state = NULL; |
4eee4fa4 | 4180 | u64 start = page_offset(page); |
d1310b2e CM |
4181 | u64 end = start + PAGE_CACHE_SIZE - 1; |
4182 | size_t blocksize = page->mapping->host->i_sb->s_blocksize; | |
4183 | ||
fda2832f | 4184 | start += ALIGN(offset, blocksize); |
d1310b2e CM |
4185 | if (start > end) |
4186 | return 0; | |
4187 | ||
d0082371 | 4188 | lock_extent_bits(tree, start, end, 0, &cached_state); |
1edbb734 | 4189 | wait_on_page_writeback(page); |
d1310b2e | 4190 | clear_extent_bit(tree, start, end, |
32c00aff JB |
4191 | EXTENT_LOCKED | EXTENT_DIRTY | EXTENT_DELALLOC | |
4192 | EXTENT_DO_ACCOUNTING, | |
2ac55d41 | 4193 | 1, 1, &cached_state, GFP_NOFS); |
d1310b2e CM |
4194 | return 0; |
4195 | } | |
d1310b2e | 4196 | |
7b13b7b1 CM |
4197 | /* |
4198 | * a helper for releasepage, this tests for areas of the page that | |
4199 | * are locked or under IO and drops the related state bits if it is safe | |
4200 | * to drop the page. | |
4201 | */ | |
48a3b636 ES |
4202 | static int try_release_extent_state(struct extent_map_tree *map, |
4203 | struct extent_io_tree *tree, | |
4204 | struct page *page, gfp_t mask) | |
7b13b7b1 | 4205 | { |
4eee4fa4 | 4206 | u64 start = page_offset(page); |
7b13b7b1 CM |
4207 | u64 end = start + PAGE_CACHE_SIZE - 1; |
4208 | int ret = 1; | |
4209 | ||
211f90e6 | 4210 | if (test_range_bit(tree, start, end, |
8b62b72b | 4211 | EXTENT_IOBITS, 0, NULL)) |
7b13b7b1 CM |
4212 | ret = 0; |
4213 | else { | |
4214 | if ((mask & GFP_NOFS) == GFP_NOFS) | |
4215 | mask = GFP_NOFS; | |
11ef160f CM |
4216 | /* |
4217 | * at this point we can safely clear everything except the | |
4218 | * locked bit and the nodatasum bit | |
4219 | */ | |
e3f24cc5 | 4220 | ret = clear_extent_bit(tree, start, end, |
11ef160f CM |
4221 | ~(EXTENT_LOCKED | EXTENT_NODATASUM), |
4222 | 0, 0, NULL, mask); | |
e3f24cc5 CM |
4223 | |
4224 | /* if clear_extent_bit failed for enomem reasons, | |
4225 | * we can't allow the release to continue. | |
4226 | */ | |
4227 | if (ret < 0) | |
4228 | ret = 0; | |
4229 | else | |
4230 | ret = 1; | |
7b13b7b1 CM |
4231 | } |
4232 | return ret; | |
4233 | } | |
7b13b7b1 | 4234 | |
d1310b2e CM |
4235 | /* |
4236 | * a helper for releasepage. As long as there are no locked extents | |
4237 | * in the range corresponding to the page, both state records and extent | |
4238 | * map records are removed | |
4239 | */ | |
4240 | int try_release_extent_mapping(struct extent_map_tree *map, | |
70dec807 CM |
4241 | struct extent_io_tree *tree, struct page *page, |
4242 | gfp_t mask) | |
d1310b2e CM |
4243 | { |
4244 | struct extent_map *em; | |
4eee4fa4 | 4245 | u64 start = page_offset(page); |
d1310b2e | 4246 | u64 end = start + PAGE_CACHE_SIZE - 1; |
7b13b7b1 | 4247 | |
70dec807 CM |
4248 | if ((mask & __GFP_WAIT) && |
4249 | page->mapping->host->i_size > 16 * 1024 * 1024) { | |
39b5637f | 4250 | u64 len; |
70dec807 | 4251 | while (start <= end) { |
39b5637f | 4252 | len = end - start + 1; |
890871be | 4253 | write_lock(&map->lock); |
39b5637f | 4254 | em = lookup_extent_mapping(map, start, len); |
285190d9 | 4255 | if (!em) { |
890871be | 4256 | write_unlock(&map->lock); |
70dec807 CM |
4257 | break; |
4258 | } | |
7f3c74fb CM |
4259 | if (test_bit(EXTENT_FLAG_PINNED, &em->flags) || |
4260 | em->start != start) { | |
890871be | 4261 | write_unlock(&map->lock); |
70dec807 CM |
4262 | free_extent_map(em); |
4263 | break; | |
4264 | } | |
4265 | if (!test_range_bit(tree, em->start, | |
4266 | extent_map_end(em) - 1, | |
8b62b72b | 4267 | EXTENT_LOCKED | EXTENT_WRITEBACK, |
9655d298 | 4268 | 0, NULL)) { |
70dec807 CM |
4269 | remove_extent_mapping(map, em); |
4270 | /* once for the rb tree */ | |
4271 | free_extent_map(em); | |
4272 | } | |
4273 | start = extent_map_end(em); | |
890871be | 4274 | write_unlock(&map->lock); |
70dec807 CM |
4275 | |
4276 | /* once for us */ | |
d1310b2e CM |
4277 | free_extent_map(em); |
4278 | } | |
d1310b2e | 4279 | } |
7b13b7b1 | 4280 | return try_release_extent_state(map, tree, page, mask); |
d1310b2e | 4281 | } |
d1310b2e | 4282 | |
ec29ed5b CM |
4283 | /* |
4284 | * helper function for fiemap, which doesn't want to see any holes. | |
4285 | * This maps until we find something past 'last' | |
4286 | */ | |
4287 | static struct extent_map *get_extent_skip_holes(struct inode *inode, | |
4288 | u64 offset, | |
4289 | u64 last, | |
4290 | get_extent_t *get_extent) | |
4291 | { | |
4292 | u64 sectorsize = BTRFS_I(inode)->root->sectorsize; | |
4293 | struct extent_map *em; | |
4294 | u64 len; | |
4295 | ||
4296 | if (offset >= last) | |
4297 | return NULL; | |
4298 | ||
67871254 | 4299 | while (1) { |
ec29ed5b CM |
4300 | len = last - offset; |
4301 | if (len == 0) | |
4302 | break; | |
fda2832f | 4303 | len = ALIGN(len, sectorsize); |
ec29ed5b | 4304 | em = get_extent(inode, NULL, 0, offset, len, 0); |
c704005d | 4305 | if (IS_ERR_OR_NULL(em)) |
ec29ed5b CM |
4306 | return em; |
4307 | ||
4308 | /* if this isn't a hole return it */ | |
4309 | if (!test_bit(EXTENT_FLAG_VACANCY, &em->flags) && | |
4310 | em->block_start != EXTENT_MAP_HOLE) { | |
4311 | return em; | |
4312 | } | |
4313 | ||
4314 | /* this is a hole, advance to the next extent */ | |
4315 | offset = extent_map_end(em); | |
4316 | free_extent_map(em); | |
4317 | if (offset >= last) | |
4318 | break; | |
4319 | } | |
4320 | return NULL; | |
4321 | } | |
4322 | ||
1506fcc8 YS |
4323 | int extent_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, |
4324 | __u64 start, __u64 len, get_extent_t *get_extent) | |
4325 | { | |
975f84fe | 4326 | int ret = 0; |
1506fcc8 YS |
4327 | u64 off = start; |
4328 | u64 max = start + len; | |
4329 | u32 flags = 0; | |
975f84fe JB |
4330 | u32 found_type; |
4331 | u64 last; | |
ec29ed5b | 4332 | u64 last_for_get_extent = 0; |
1506fcc8 | 4333 | u64 disko = 0; |
ec29ed5b | 4334 | u64 isize = i_size_read(inode); |
975f84fe | 4335 | struct btrfs_key found_key; |
1506fcc8 | 4336 | struct extent_map *em = NULL; |
2ac55d41 | 4337 | struct extent_state *cached_state = NULL; |
975f84fe | 4338 | struct btrfs_path *path; |
dc046b10 | 4339 | struct btrfs_root *root = BTRFS_I(inode)->root; |
1506fcc8 | 4340 | int end = 0; |
ec29ed5b CM |
4341 | u64 em_start = 0; |
4342 | u64 em_len = 0; | |
4343 | u64 em_end = 0; | |
1506fcc8 YS |
4344 | |
4345 | if (len == 0) | |
4346 | return -EINVAL; | |
4347 | ||
975f84fe JB |
4348 | path = btrfs_alloc_path(); |
4349 | if (!path) | |
4350 | return -ENOMEM; | |
4351 | path->leave_spinning = 1; | |
4352 | ||
2c91943b QW |
4353 | start = round_down(start, BTRFS_I(inode)->root->sectorsize); |
4354 | len = round_up(max, BTRFS_I(inode)->root->sectorsize) - start; | |
4d479cf0 | 4355 | |
ec29ed5b CM |
4356 | /* |
4357 | * lookup the last file extent. We're not using i_size here | |
4358 | * because there might be preallocation past i_size | |
4359 | */ | |
dc046b10 JB |
4360 | ret = btrfs_lookup_file_extent(NULL, root, path, btrfs_ino(inode), -1, |
4361 | 0); | |
975f84fe JB |
4362 | if (ret < 0) { |
4363 | btrfs_free_path(path); | |
4364 | return ret; | |
4365 | } | |
4366 | WARN_ON(!ret); | |
4367 | path->slots[0]--; | |
975f84fe | 4368 | btrfs_item_key_to_cpu(path->nodes[0], &found_key, path->slots[0]); |
962a298f | 4369 | found_type = found_key.type; |
975f84fe | 4370 | |
ec29ed5b | 4371 | /* No extents, but there might be delalloc bits */ |
33345d01 | 4372 | if (found_key.objectid != btrfs_ino(inode) || |
975f84fe | 4373 | found_type != BTRFS_EXTENT_DATA_KEY) { |
ec29ed5b CM |
4374 | /* have to trust i_size as the end */ |
4375 | last = (u64)-1; | |
4376 | last_for_get_extent = isize; | |
4377 | } else { | |
4378 | /* | |
4379 | * remember the start of the last extent. There are a | |
4380 | * bunch of different factors that go into the length of the | |
4381 | * extent, so its much less complex to remember where it started | |
4382 | */ | |
4383 | last = found_key.offset; | |
4384 | last_for_get_extent = last + 1; | |
975f84fe | 4385 | } |
fe09e16c | 4386 | btrfs_release_path(path); |
975f84fe | 4387 | |
ec29ed5b CM |
4388 | /* |
4389 | * we might have some extents allocated but more delalloc past those | |
4390 | * extents. so, we trust isize unless the start of the last extent is | |
4391 | * beyond isize | |
4392 | */ | |
4393 | if (last < isize) { | |
4394 | last = (u64)-1; | |
4395 | last_for_get_extent = isize; | |
4396 | } | |
4397 | ||
a52f4cd2 | 4398 | lock_extent_bits(&BTRFS_I(inode)->io_tree, start, start + len - 1, 0, |
d0082371 | 4399 | &cached_state); |
ec29ed5b | 4400 | |
4d479cf0 | 4401 | em = get_extent_skip_holes(inode, start, last_for_get_extent, |
ec29ed5b | 4402 | get_extent); |
1506fcc8 YS |
4403 | if (!em) |
4404 | goto out; | |
4405 | if (IS_ERR(em)) { | |
4406 | ret = PTR_ERR(em); | |
4407 | goto out; | |
4408 | } | |
975f84fe | 4409 | |
1506fcc8 | 4410 | while (!end) { |
b76bb701 | 4411 | u64 offset_in_extent = 0; |
ea8efc74 CM |
4412 | |
4413 | /* break if the extent we found is outside the range */ | |
4414 | if (em->start >= max || extent_map_end(em) < off) | |
4415 | break; | |
4416 | ||
4417 | /* | |
4418 | * get_extent may return an extent that starts before our | |
4419 | * requested range. We have to make sure the ranges | |
4420 | * we return to fiemap always move forward and don't | |
4421 | * overlap, so adjust the offsets here | |
4422 | */ | |
4423 | em_start = max(em->start, off); | |
1506fcc8 | 4424 | |
ea8efc74 CM |
4425 | /* |
4426 | * record the offset from the start of the extent | |
b76bb701 JB |
4427 | * for adjusting the disk offset below. Only do this if the |
4428 | * extent isn't compressed since our in ram offset may be past | |
4429 | * what we have actually allocated on disk. | |
ea8efc74 | 4430 | */ |
b76bb701 JB |
4431 | if (!test_bit(EXTENT_FLAG_COMPRESSED, &em->flags)) |
4432 | offset_in_extent = em_start - em->start; | |
ec29ed5b | 4433 | em_end = extent_map_end(em); |
ea8efc74 | 4434 | em_len = em_end - em_start; |
1506fcc8 YS |
4435 | disko = 0; |
4436 | flags = 0; | |
4437 | ||
ea8efc74 CM |
4438 | /* |
4439 | * bump off for our next call to get_extent | |
4440 | */ | |
4441 | off = extent_map_end(em); | |
4442 | if (off >= max) | |
4443 | end = 1; | |
4444 | ||
93dbfad7 | 4445 | if (em->block_start == EXTENT_MAP_LAST_BYTE) { |
1506fcc8 YS |
4446 | end = 1; |
4447 | flags |= FIEMAP_EXTENT_LAST; | |
93dbfad7 | 4448 | } else if (em->block_start == EXTENT_MAP_INLINE) { |
1506fcc8 YS |
4449 | flags |= (FIEMAP_EXTENT_DATA_INLINE | |
4450 | FIEMAP_EXTENT_NOT_ALIGNED); | |
93dbfad7 | 4451 | } else if (em->block_start == EXTENT_MAP_DELALLOC) { |
1506fcc8 YS |
4452 | flags |= (FIEMAP_EXTENT_DELALLOC | |
4453 | FIEMAP_EXTENT_UNKNOWN); | |
dc046b10 JB |
4454 | } else if (fieinfo->fi_extents_max) { |
4455 | u64 bytenr = em->block_start - | |
4456 | (em->start - em->orig_start); | |
fe09e16c | 4457 | |
ea8efc74 | 4458 | disko = em->block_start + offset_in_extent; |
fe09e16c LB |
4459 | |
4460 | /* | |
4461 | * As btrfs supports shared space, this information | |
4462 | * can be exported to userspace tools via | |
dc046b10 JB |
4463 | * flag FIEMAP_EXTENT_SHARED. If fi_extents_max == 0 |
4464 | * then we're just getting a count and we can skip the | |
4465 | * lookup stuff. | |
fe09e16c | 4466 | */ |
dc046b10 JB |
4467 | ret = btrfs_check_shared(NULL, root->fs_info, |
4468 | root->objectid, | |
4469 | btrfs_ino(inode), bytenr); | |
4470 | if (ret < 0) | |
fe09e16c | 4471 | goto out_free; |
dc046b10 | 4472 | if (ret) |
fe09e16c | 4473 | flags |= FIEMAP_EXTENT_SHARED; |
dc046b10 | 4474 | ret = 0; |
1506fcc8 YS |
4475 | } |
4476 | if (test_bit(EXTENT_FLAG_COMPRESSED, &em->flags)) | |
4477 | flags |= FIEMAP_EXTENT_ENCODED; | |
4478 | ||
1506fcc8 YS |
4479 | free_extent_map(em); |
4480 | em = NULL; | |
ec29ed5b CM |
4481 | if ((em_start >= last) || em_len == (u64)-1 || |
4482 | (last == (u64)-1 && isize <= em_end)) { | |
1506fcc8 YS |
4483 | flags |= FIEMAP_EXTENT_LAST; |
4484 | end = 1; | |
4485 | } | |
4486 | ||
ec29ed5b CM |
4487 | /* now scan forward to see if this is really the last extent. */ |
4488 | em = get_extent_skip_holes(inode, off, last_for_get_extent, | |
4489 | get_extent); | |
4490 | if (IS_ERR(em)) { | |
4491 | ret = PTR_ERR(em); | |
4492 | goto out; | |
4493 | } | |
4494 | if (!em) { | |
975f84fe JB |
4495 | flags |= FIEMAP_EXTENT_LAST; |
4496 | end = 1; | |
4497 | } | |
ec29ed5b CM |
4498 | ret = fiemap_fill_next_extent(fieinfo, em_start, disko, |
4499 | em_len, flags); | |
4500 | if (ret) | |
4501 | goto out_free; | |
1506fcc8 YS |
4502 | } |
4503 | out_free: | |
4504 | free_extent_map(em); | |
4505 | out: | |
fe09e16c | 4506 | btrfs_free_path(path); |
a52f4cd2 | 4507 | unlock_extent_cached(&BTRFS_I(inode)->io_tree, start, start + len - 1, |
2ac55d41 | 4508 | &cached_state, GFP_NOFS); |
1506fcc8 YS |
4509 | return ret; |
4510 | } | |
4511 | ||
727011e0 CM |
4512 | static void __free_extent_buffer(struct extent_buffer *eb) |
4513 | { | |
6d49ba1b | 4514 | btrfs_leak_debug_del(&eb->leak_list); |
727011e0 CM |
4515 | kmem_cache_free(extent_buffer_cache, eb); |
4516 | } | |
4517 | ||
a26e8c9f | 4518 | int extent_buffer_under_io(struct extent_buffer *eb) |
db7f3436 JB |
4519 | { |
4520 | return (atomic_read(&eb->io_pages) || | |
4521 | test_bit(EXTENT_BUFFER_WRITEBACK, &eb->bflags) || | |
4522 | test_bit(EXTENT_BUFFER_DIRTY, &eb->bflags)); | |
4523 | } | |
4524 | ||
4525 | /* | |
4526 | * Helper for releasing extent buffer page. | |
4527 | */ | |
a50924e3 | 4528 | static void btrfs_release_extent_buffer_page(struct extent_buffer *eb) |
db7f3436 JB |
4529 | { |
4530 | unsigned long index; | |
db7f3436 JB |
4531 | struct page *page; |
4532 | int mapped = !test_bit(EXTENT_BUFFER_DUMMY, &eb->bflags); | |
4533 | ||
4534 | BUG_ON(extent_buffer_under_io(eb)); | |
4535 | ||
a50924e3 DS |
4536 | index = num_extent_pages(eb->start, eb->len); |
4537 | if (index == 0) | |
db7f3436 JB |
4538 | return; |
4539 | ||
4540 | do { | |
4541 | index--; | |
fb85fc9a | 4542 | page = eb->pages[index]; |
db7f3436 JB |
4543 | if (page && mapped) { |
4544 | spin_lock(&page->mapping->private_lock); | |
4545 | /* | |
4546 | * We do this since we'll remove the pages after we've | |
4547 | * removed the eb from the radix tree, so we could race | |
4548 | * and have this page now attached to the new eb. So | |
4549 | * only clear page_private if it's still connected to | |
4550 | * this eb. | |
4551 | */ | |
4552 | if (PagePrivate(page) && | |
4553 | page->private == (unsigned long)eb) { | |
4554 | BUG_ON(test_bit(EXTENT_BUFFER_DIRTY, &eb->bflags)); | |
4555 | BUG_ON(PageDirty(page)); | |
4556 | BUG_ON(PageWriteback(page)); | |
4557 | /* | |
4558 | * We need to make sure we haven't be attached | |
4559 | * to a new eb. | |
4560 | */ | |
4561 | ClearPagePrivate(page); | |
4562 | set_page_private(page, 0); | |
4563 | /* One for the page private */ | |
4564 | page_cache_release(page); | |
4565 | } | |
4566 | spin_unlock(&page->mapping->private_lock); | |
4567 | ||
4568 | } | |
4569 | if (page) { | |
4570 | /* One for when we alloced the page */ | |
4571 | page_cache_release(page); | |
4572 | } | |
a50924e3 | 4573 | } while (index != 0); |
db7f3436 JB |
4574 | } |
4575 | ||
4576 | /* | |
4577 | * Helper for releasing the extent buffer. | |
4578 | */ | |
4579 | static inline void btrfs_release_extent_buffer(struct extent_buffer *eb) | |
4580 | { | |
a50924e3 | 4581 | btrfs_release_extent_buffer_page(eb); |
db7f3436 JB |
4582 | __free_extent_buffer(eb); |
4583 | } | |
4584 | ||
f28491e0 JB |
4585 | static struct extent_buffer * |
4586 | __alloc_extent_buffer(struct btrfs_fs_info *fs_info, u64 start, | |
4587 | unsigned long len, gfp_t mask) | |
d1310b2e CM |
4588 | { |
4589 | struct extent_buffer *eb = NULL; | |
4590 | ||
d1310b2e | 4591 | eb = kmem_cache_zalloc(extent_buffer_cache, mask); |
91ca338d TI |
4592 | if (eb == NULL) |
4593 | return NULL; | |
d1310b2e CM |
4594 | eb->start = start; |
4595 | eb->len = len; | |
f28491e0 | 4596 | eb->fs_info = fs_info; |
815a51c7 | 4597 | eb->bflags = 0; |
bd681513 CM |
4598 | rwlock_init(&eb->lock); |
4599 | atomic_set(&eb->write_locks, 0); | |
4600 | atomic_set(&eb->read_locks, 0); | |
4601 | atomic_set(&eb->blocking_readers, 0); | |
4602 | atomic_set(&eb->blocking_writers, 0); | |
4603 | atomic_set(&eb->spinning_readers, 0); | |
4604 | atomic_set(&eb->spinning_writers, 0); | |
5b25f70f | 4605 | eb->lock_nested = 0; |
bd681513 CM |
4606 | init_waitqueue_head(&eb->write_lock_wq); |
4607 | init_waitqueue_head(&eb->read_lock_wq); | |
b4ce94de | 4608 | |
6d49ba1b ES |
4609 | btrfs_leak_debug_add(&eb->leak_list, &buffers); |
4610 | ||
3083ee2e | 4611 | spin_lock_init(&eb->refs_lock); |
d1310b2e | 4612 | atomic_set(&eb->refs, 1); |
0b32f4bb | 4613 | atomic_set(&eb->io_pages, 0); |
727011e0 | 4614 | |
b8dae313 DS |
4615 | /* |
4616 | * Sanity checks, currently the maximum is 64k covered by 16x 4k pages | |
4617 | */ | |
4618 | BUILD_BUG_ON(BTRFS_MAX_METADATA_BLOCKSIZE | |
4619 | > MAX_INLINE_EXTENT_BUFFER_SIZE); | |
4620 | BUG_ON(len > MAX_INLINE_EXTENT_BUFFER_SIZE); | |
d1310b2e CM |
4621 | |
4622 | return eb; | |
4623 | } | |
4624 | ||
815a51c7 JS |
4625 | struct extent_buffer *btrfs_clone_extent_buffer(struct extent_buffer *src) |
4626 | { | |
4627 | unsigned long i; | |
4628 | struct page *p; | |
4629 | struct extent_buffer *new; | |
4630 | unsigned long num_pages = num_extent_pages(src->start, src->len); | |
4631 | ||
9ec72677 | 4632 | new = __alloc_extent_buffer(NULL, src->start, src->len, GFP_NOFS); |
815a51c7 JS |
4633 | if (new == NULL) |
4634 | return NULL; | |
4635 | ||
4636 | for (i = 0; i < num_pages; i++) { | |
9ec72677 | 4637 | p = alloc_page(GFP_NOFS); |
db7f3436 JB |
4638 | if (!p) { |
4639 | btrfs_release_extent_buffer(new); | |
4640 | return NULL; | |
4641 | } | |
815a51c7 JS |
4642 | attach_extent_buffer_page(new, p); |
4643 | WARN_ON(PageDirty(p)); | |
4644 | SetPageUptodate(p); | |
4645 | new->pages[i] = p; | |
4646 | } | |
4647 | ||
4648 | copy_extent_buffer(new, src, 0, 0, src->len); | |
4649 | set_bit(EXTENT_BUFFER_UPTODATE, &new->bflags); | |
4650 | set_bit(EXTENT_BUFFER_DUMMY, &new->bflags); | |
4651 | ||
4652 | return new; | |
4653 | } | |
4654 | ||
4655 | struct extent_buffer *alloc_dummy_extent_buffer(u64 start, unsigned long len) | |
4656 | { | |
4657 | struct extent_buffer *eb; | |
4658 | unsigned long num_pages = num_extent_pages(0, len); | |
4659 | unsigned long i; | |
4660 | ||
9ec72677 | 4661 | eb = __alloc_extent_buffer(NULL, start, len, GFP_NOFS); |
815a51c7 JS |
4662 | if (!eb) |
4663 | return NULL; | |
4664 | ||
4665 | for (i = 0; i < num_pages; i++) { | |
9ec72677 | 4666 | eb->pages[i] = alloc_page(GFP_NOFS); |
815a51c7 JS |
4667 | if (!eb->pages[i]) |
4668 | goto err; | |
4669 | } | |
4670 | set_extent_buffer_uptodate(eb); | |
4671 | btrfs_set_header_nritems(eb, 0); | |
4672 | set_bit(EXTENT_BUFFER_DUMMY, &eb->bflags); | |
4673 | ||
4674 | return eb; | |
4675 | err: | |
84167d19 SB |
4676 | for (; i > 0; i--) |
4677 | __free_page(eb->pages[i - 1]); | |
815a51c7 JS |
4678 | __free_extent_buffer(eb); |
4679 | return NULL; | |
4680 | } | |
4681 | ||
0b32f4bb JB |
4682 | static void check_buffer_tree_ref(struct extent_buffer *eb) |
4683 | { | |
242e18c7 | 4684 | int refs; |
0b32f4bb JB |
4685 | /* the ref bit is tricky. We have to make sure it is set |
4686 | * if we have the buffer dirty. Otherwise the | |
4687 | * code to free a buffer can end up dropping a dirty | |
4688 | * page | |
4689 | * | |
4690 | * Once the ref bit is set, it won't go away while the | |
4691 | * buffer is dirty or in writeback, and it also won't | |
4692 | * go away while we have the reference count on the | |
4693 | * eb bumped. | |
4694 | * | |
4695 | * We can't just set the ref bit without bumping the | |
4696 | * ref on the eb because free_extent_buffer might | |
4697 | * see the ref bit and try to clear it. If this happens | |
4698 | * free_extent_buffer might end up dropping our original | |
4699 | * ref by mistake and freeing the page before we are able | |
4700 | * to add one more ref. | |
4701 | * | |
4702 | * So bump the ref count first, then set the bit. If someone | |
4703 | * beat us to it, drop the ref we added. | |
4704 | */ | |
242e18c7 CM |
4705 | refs = atomic_read(&eb->refs); |
4706 | if (refs >= 2 && test_bit(EXTENT_BUFFER_TREE_REF, &eb->bflags)) | |
4707 | return; | |
4708 | ||
594831c4 JB |
4709 | spin_lock(&eb->refs_lock); |
4710 | if (!test_and_set_bit(EXTENT_BUFFER_TREE_REF, &eb->bflags)) | |
0b32f4bb | 4711 | atomic_inc(&eb->refs); |
594831c4 | 4712 | spin_unlock(&eb->refs_lock); |
0b32f4bb JB |
4713 | } |
4714 | ||
2457aec6 MG |
4715 | static void mark_extent_buffer_accessed(struct extent_buffer *eb, |
4716 | struct page *accessed) | |
5df4235e JB |
4717 | { |
4718 | unsigned long num_pages, i; | |
4719 | ||
0b32f4bb JB |
4720 | check_buffer_tree_ref(eb); |
4721 | ||
5df4235e JB |
4722 | num_pages = num_extent_pages(eb->start, eb->len); |
4723 | for (i = 0; i < num_pages; i++) { | |
fb85fc9a DS |
4724 | struct page *p = eb->pages[i]; |
4725 | ||
2457aec6 MG |
4726 | if (p != accessed) |
4727 | mark_page_accessed(p); | |
5df4235e JB |
4728 | } |
4729 | } | |
4730 | ||
f28491e0 JB |
4731 | struct extent_buffer *find_extent_buffer(struct btrfs_fs_info *fs_info, |
4732 | u64 start) | |
452c75c3 CS |
4733 | { |
4734 | struct extent_buffer *eb; | |
4735 | ||
4736 | rcu_read_lock(); | |
f28491e0 JB |
4737 | eb = radix_tree_lookup(&fs_info->buffer_radix, |
4738 | start >> PAGE_CACHE_SHIFT); | |
452c75c3 CS |
4739 | if (eb && atomic_inc_not_zero(&eb->refs)) { |
4740 | rcu_read_unlock(); | |
2457aec6 | 4741 | mark_extent_buffer_accessed(eb, NULL); |
452c75c3 CS |
4742 | return eb; |
4743 | } | |
4744 | rcu_read_unlock(); | |
4745 | ||
4746 | return NULL; | |
4747 | } | |
4748 | ||
faa2dbf0 JB |
4749 | #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS |
4750 | struct extent_buffer *alloc_test_extent_buffer(struct btrfs_fs_info *fs_info, | |
4751 | u64 start, unsigned long len) | |
4752 | { | |
4753 | struct extent_buffer *eb, *exists = NULL; | |
4754 | int ret; | |
4755 | ||
4756 | eb = find_extent_buffer(fs_info, start); | |
4757 | if (eb) | |
4758 | return eb; | |
4759 | eb = alloc_dummy_extent_buffer(start, len); | |
4760 | if (!eb) | |
4761 | return NULL; | |
4762 | eb->fs_info = fs_info; | |
4763 | again: | |
4764 | ret = radix_tree_preload(GFP_NOFS & ~__GFP_HIGHMEM); | |
4765 | if (ret) | |
4766 | goto free_eb; | |
4767 | spin_lock(&fs_info->buffer_lock); | |
4768 | ret = radix_tree_insert(&fs_info->buffer_radix, | |
4769 | start >> PAGE_CACHE_SHIFT, eb); | |
4770 | spin_unlock(&fs_info->buffer_lock); | |
4771 | radix_tree_preload_end(); | |
4772 | if (ret == -EEXIST) { | |
4773 | exists = find_extent_buffer(fs_info, start); | |
4774 | if (exists) | |
4775 | goto free_eb; | |
4776 | else | |
4777 | goto again; | |
4778 | } | |
4779 | check_buffer_tree_ref(eb); | |
4780 | set_bit(EXTENT_BUFFER_IN_TREE, &eb->bflags); | |
4781 | ||
4782 | /* | |
4783 | * We will free dummy extent buffer's if they come into | |
4784 | * free_extent_buffer with a ref count of 2, but if we are using this we | |
4785 | * want the buffers to stay in memory until we're done with them, so | |
4786 | * bump the ref count again. | |
4787 | */ | |
4788 | atomic_inc(&eb->refs); | |
4789 | return eb; | |
4790 | free_eb: | |
4791 | btrfs_release_extent_buffer(eb); | |
4792 | return exists; | |
4793 | } | |
4794 | #endif | |
4795 | ||
f28491e0 | 4796 | struct extent_buffer *alloc_extent_buffer(struct btrfs_fs_info *fs_info, |
727011e0 | 4797 | u64 start, unsigned long len) |
d1310b2e CM |
4798 | { |
4799 | unsigned long num_pages = num_extent_pages(start, len); | |
4800 | unsigned long i; | |
4801 | unsigned long index = start >> PAGE_CACHE_SHIFT; | |
4802 | struct extent_buffer *eb; | |
6af118ce | 4803 | struct extent_buffer *exists = NULL; |
d1310b2e | 4804 | struct page *p; |
f28491e0 | 4805 | struct address_space *mapping = fs_info->btree_inode->i_mapping; |
d1310b2e | 4806 | int uptodate = 1; |
19fe0a8b | 4807 | int ret; |
d1310b2e | 4808 | |
f28491e0 | 4809 | eb = find_extent_buffer(fs_info, start); |
452c75c3 | 4810 | if (eb) |
6af118ce | 4811 | return eb; |
6af118ce | 4812 | |
f28491e0 | 4813 | eb = __alloc_extent_buffer(fs_info, start, len, GFP_NOFS); |
2b114d1d | 4814 | if (!eb) |
d1310b2e CM |
4815 | return NULL; |
4816 | ||
727011e0 | 4817 | for (i = 0; i < num_pages; i++, index++) { |
a6591715 | 4818 | p = find_or_create_page(mapping, index, GFP_NOFS); |
4804b382 | 4819 | if (!p) |
6af118ce | 4820 | goto free_eb; |
4f2de97a JB |
4821 | |
4822 | spin_lock(&mapping->private_lock); | |
4823 | if (PagePrivate(p)) { | |
4824 | /* | |
4825 | * We could have already allocated an eb for this page | |
4826 | * and attached one so lets see if we can get a ref on | |
4827 | * the existing eb, and if we can we know it's good and | |
4828 | * we can just return that one, else we know we can just | |
4829 | * overwrite page->private. | |
4830 | */ | |
4831 | exists = (struct extent_buffer *)p->private; | |
4832 | if (atomic_inc_not_zero(&exists->refs)) { | |
4833 | spin_unlock(&mapping->private_lock); | |
4834 | unlock_page(p); | |
17de39ac | 4835 | page_cache_release(p); |
2457aec6 | 4836 | mark_extent_buffer_accessed(exists, p); |
4f2de97a JB |
4837 | goto free_eb; |
4838 | } | |
4839 | ||
0b32f4bb | 4840 | /* |
4f2de97a JB |
4841 | * Do this so attach doesn't complain and we need to |
4842 | * drop the ref the old guy had. | |
4843 | */ | |
4844 | ClearPagePrivate(p); | |
0b32f4bb | 4845 | WARN_ON(PageDirty(p)); |
4f2de97a | 4846 | page_cache_release(p); |
d1310b2e | 4847 | } |
4f2de97a JB |
4848 | attach_extent_buffer_page(eb, p); |
4849 | spin_unlock(&mapping->private_lock); | |
0b32f4bb | 4850 | WARN_ON(PageDirty(p)); |
727011e0 | 4851 | eb->pages[i] = p; |
d1310b2e CM |
4852 | if (!PageUptodate(p)) |
4853 | uptodate = 0; | |
eb14ab8e CM |
4854 | |
4855 | /* | |
4856 | * see below about how we avoid a nasty race with release page | |
4857 | * and why we unlock later | |
4858 | */ | |
d1310b2e CM |
4859 | } |
4860 | if (uptodate) | |
b4ce94de | 4861 | set_bit(EXTENT_BUFFER_UPTODATE, &eb->bflags); |
115391d2 | 4862 | again: |
19fe0a8b MX |
4863 | ret = radix_tree_preload(GFP_NOFS & ~__GFP_HIGHMEM); |
4864 | if (ret) | |
4865 | goto free_eb; | |
4866 | ||
f28491e0 JB |
4867 | spin_lock(&fs_info->buffer_lock); |
4868 | ret = radix_tree_insert(&fs_info->buffer_radix, | |
4869 | start >> PAGE_CACHE_SHIFT, eb); | |
4870 | spin_unlock(&fs_info->buffer_lock); | |
452c75c3 | 4871 | radix_tree_preload_end(); |
19fe0a8b | 4872 | if (ret == -EEXIST) { |
f28491e0 | 4873 | exists = find_extent_buffer(fs_info, start); |
452c75c3 CS |
4874 | if (exists) |
4875 | goto free_eb; | |
4876 | else | |
115391d2 | 4877 | goto again; |
6af118ce | 4878 | } |
6af118ce | 4879 | /* add one reference for the tree */ |
0b32f4bb | 4880 | check_buffer_tree_ref(eb); |
34b41ace | 4881 | set_bit(EXTENT_BUFFER_IN_TREE, &eb->bflags); |
eb14ab8e CM |
4882 | |
4883 | /* | |
4884 | * there is a race where release page may have | |
4885 | * tried to find this extent buffer in the radix | |
4886 | * but failed. It will tell the VM it is safe to | |
4887 | * reclaim the, and it will clear the page private bit. | |
4888 | * We must make sure to set the page private bit properly | |
4889 | * after the extent buffer is in the radix tree so | |
4890 | * it doesn't get lost | |
4891 | */ | |
727011e0 CM |
4892 | SetPageChecked(eb->pages[0]); |
4893 | for (i = 1; i < num_pages; i++) { | |
fb85fc9a | 4894 | p = eb->pages[i]; |
727011e0 CM |
4895 | ClearPageChecked(p); |
4896 | unlock_page(p); | |
4897 | } | |
4898 | unlock_page(eb->pages[0]); | |
d1310b2e CM |
4899 | return eb; |
4900 | ||
6af118ce | 4901 | free_eb: |
727011e0 CM |
4902 | for (i = 0; i < num_pages; i++) { |
4903 | if (eb->pages[i]) | |
4904 | unlock_page(eb->pages[i]); | |
4905 | } | |
eb14ab8e | 4906 | |
17de39ac | 4907 | WARN_ON(!atomic_dec_and_test(&eb->refs)); |
897ca6e9 | 4908 | btrfs_release_extent_buffer(eb); |
6af118ce | 4909 | return exists; |
d1310b2e | 4910 | } |
d1310b2e | 4911 | |
3083ee2e JB |
4912 | static inline void btrfs_release_extent_buffer_rcu(struct rcu_head *head) |
4913 | { | |
4914 | struct extent_buffer *eb = | |
4915 | container_of(head, struct extent_buffer, rcu_head); | |
4916 | ||
4917 | __free_extent_buffer(eb); | |
4918 | } | |
4919 | ||
3083ee2e | 4920 | /* Expects to have eb->eb_lock already held */ |
f7a52a40 | 4921 | static int release_extent_buffer(struct extent_buffer *eb) |
3083ee2e JB |
4922 | { |
4923 | WARN_ON(atomic_read(&eb->refs) == 0); | |
4924 | if (atomic_dec_and_test(&eb->refs)) { | |
34b41ace | 4925 | if (test_and_clear_bit(EXTENT_BUFFER_IN_TREE, &eb->bflags)) { |
f28491e0 | 4926 | struct btrfs_fs_info *fs_info = eb->fs_info; |
3083ee2e | 4927 | |
815a51c7 | 4928 | spin_unlock(&eb->refs_lock); |
3083ee2e | 4929 | |
f28491e0 JB |
4930 | spin_lock(&fs_info->buffer_lock); |
4931 | radix_tree_delete(&fs_info->buffer_radix, | |
815a51c7 | 4932 | eb->start >> PAGE_CACHE_SHIFT); |
f28491e0 | 4933 | spin_unlock(&fs_info->buffer_lock); |
34b41ace JB |
4934 | } else { |
4935 | spin_unlock(&eb->refs_lock); | |
815a51c7 | 4936 | } |
3083ee2e JB |
4937 | |
4938 | /* Should be safe to release our pages at this point */ | |
a50924e3 | 4939 | btrfs_release_extent_buffer_page(eb); |
3083ee2e | 4940 | call_rcu(&eb->rcu_head, btrfs_release_extent_buffer_rcu); |
e64860aa | 4941 | return 1; |
3083ee2e JB |
4942 | } |
4943 | spin_unlock(&eb->refs_lock); | |
e64860aa JB |
4944 | |
4945 | return 0; | |
3083ee2e JB |
4946 | } |
4947 | ||
d1310b2e CM |
4948 | void free_extent_buffer(struct extent_buffer *eb) |
4949 | { | |
242e18c7 CM |
4950 | int refs; |
4951 | int old; | |
d1310b2e CM |
4952 | if (!eb) |
4953 | return; | |
4954 | ||
242e18c7 CM |
4955 | while (1) { |
4956 | refs = atomic_read(&eb->refs); | |
4957 | if (refs <= 3) | |
4958 | break; | |
4959 | old = atomic_cmpxchg(&eb->refs, refs, refs - 1); | |
4960 | if (old == refs) | |
4961 | return; | |
4962 | } | |
4963 | ||
3083ee2e | 4964 | spin_lock(&eb->refs_lock); |
815a51c7 JS |
4965 | if (atomic_read(&eb->refs) == 2 && |
4966 | test_bit(EXTENT_BUFFER_DUMMY, &eb->bflags)) | |
4967 | atomic_dec(&eb->refs); | |
4968 | ||
3083ee2e JB |
4969 | if (atomic_read(&eb->refs) == 2 && |
4970 | test_bit(EXTENT_BUFFER_STALE, &eb->bflags) && | |
0b32f4bb | 4971 | !extent_buffer_under_io(eb) && |
3083ee2e JB |
4972 | test_and_clear_bit(EXTENT_BUFFER_TREE_REF, &eb->bflags)) |
4973 | atomic_dec(&eb->refs); | |
4974 | ||
4975 | /* | |
4976 | * I know this is terrible, but it's temporary until we stop tracking | |
4977 | * the uptodate bits and such for the extent buffers. | |
4978 | */ | |
f7a52a40 | 4979 | release_extent_buffer(eb); |
3083ee2e JB |
4980 | } |
4981 | ||
4982 | void free_extent_buffer_stale(struct extent_buffer *eb) | |
4983 | { | |
4984 | if (!eb) | |
d1310b2e CM |
4985 | return; |
4986 | ||
3083ee2e JB |
4987 | spin_lock(&eb->refs_lock); |
4988 | set_bit(EXTENT_BUFFER_STALE, &eb->bflags); | |
4989 | ||
0b32f4bb | 4990 | if (atomic_read(&eb->refs) == 2 && !extent_buffer_under_io(eb) && |
3083ee2e JB |
4991 | test_and_clear_bit(EXTENT_BUFFER_TREE_REF, &eb->bflags)) |
4992 | atomic_dec(&eb->refs); | |
f7a52a40 | 4993 | release_extent_buffer(eb); |
d1310b2e | 4994 | } |
d1310b2e | 4995 | |
1d4284bd | 4996 | void clear_extent_buffer_dirty(struct extent_buffer *eb) |
d1310b2e | 4997 | { |
d1310b2e CM |
4998 | unsigned long i; |
4999 | unsigned long num_pages; | |
5000 | struct page *page; | |
5001 | ||
d1310b2e CM |
5002 | num_pages = num_extent_pages(eb->start, eb->len); |
5003 | ||
5004 | for (i = 0; i < num_pages; i++) { | |
fb85fc9a | 5005 | page = eb->pages[i]; |
b9473439 | 5006 | if (!PageDirty(page)) |
d2c3f4f6 CM |
5007 | continue; |
5008 | ||
a61e6f29 | 5009 | lock_page(page); |
eb14ab8e CM |
5010 | WARN_ON(!PagePrivate(page)); |
5011 | ||
d1310b2e | 5012 | clear_page_dirty_for_io(page); |
0ee0fda0 | 5013 | spin_lock_irq(&page->mapping->tree_lock); |
d1310b2e CM |
5014 | if (!PageDirty(page)) { |
5015 | radix_tree_tag_clear(&page->mapping->page_tree, | |
5016 | page_index(page), | |
5017 | PAGECACHE_TAG_DIRTY); | |
5018 | } | |
0ee0fda0 | 5019 | spin_unlock_irq(&page->mapping->tree_lock); |
bf0da8c1 | 5020 | ClearPageError(page); |
a61e6f29 | 5021 | unlock_page(page); |
d1310b2e | 5022 | } |
0b32f4bb | 5023 | WARN_ON(atomic_read(&eb->refs) == 0); |
d1310b2e | 5024 | } |
d1310b2e | 5025 | |
0b32f4bb | 5026 | int set_extent_buffer_dirty(struct extent_buffer *eb) |
d1310b2e CM |
5027 | { |
5028 | unsigned long i; | |
5029 | unsigned long num_pages; | |
b9473439 | 5030 | int was_dirty = 0; |
d1310b2e | 5031 | |
0b32f4bb JB |
5032 | check_buffer_tree_ref(eb); |
5033 | ||
b9473439 | 5034 | was_dirty = test_and_set_bit(EXTENT_BUFFER_DIRTY, &eb->bflags); |
0b32f4bb | 5035 | |
d1310b2e | 5036 | num_pages = num_extent_pages(eb->start, eb->len); |
3083ee2e | 5037 | WARN_ON(atomic_read(&eb->refs) == 0); |
0b32f4bb JB |
5038 | WARN_ON(!test_bit(EXTENT_BUFFER_TREE_REF, &eb->bflags)); |
5039 | ||
b9473439 | 5040 | for (i = 0; i < num_pages; i++) |
fb85fc9a | 5041 | set_page_dirty(eb->pages[i]); |
b9473439 | 5042 | return was_dirty; |
d1310b2e | 5043 | } |
d1310b2e | 5044 | |
0b32f4bb | 5045 | int clear_extent_buffer_uptodate(struct extent_buffer *eb) |
1259ab75 CM |
5046 | { |
5047 | unsigned long i; | |
5048 | struct page *page; | |
5049 | unsigned long num_pages; | |
5050 | ||
b4ce94de | 5051 | clear_bit(EXTENT_BUFFER_UPTODATE, &eb->bflags); |
0b32f4bb | 5052 | num_pages = num_extent_pages(eb->start, eb->len); |
1259ab75 | 5053 | for (i = 0; i < num_pages; i++) { |
fb85fc9a | 5054 | page = eb->pages[i]; |
33958dc6 CM |
5055 | if (page) |
5056 | ClearPageUptodate(page); | |
1259ab75 CM |
5057 | } |
5058 | return 0; | |
5059 | } | |
5060 | ||
0b32f4bb | 5061 | int set_extent_buffer_uptodate(struct extent_buffer *eb) |
d1310b2e CM |
5062 | { |
5063 | unsigned long i; | |
5064 | struct page *page; | |
5065 | unsigned long num_pages; | |
5066 | ||
0b32f4bb | 5067 | set_bit(EXTENT_BUFFER_UPTODATE, &eb->bflags); |
d1310b2e | 5068 | num_pages = num_extent_pages(eb->start, eb->len); |
d1310b2e | 5069 | for (i = 0; i < num_pages; i++) { |
fb85fc9a | 5070 | page = eb->pages[i]; |
d1310b2e CM |
5071 | SetPageUptodate(page); |
5072 | } | |
5073 | return 0; | |
5074 | } | |
d1310b2e | 5075 | |
0b32f4bb | 5076 | int extent_buffer_uptodate(struct extent_buffer *eb) |
d1310b2e | 5077 | { |
0b32f4bb | 5078 | return test_bit(EXTENT_BUFFER_UPTODATE, &eb->bflags); |
d1310b2e | 5079 | } |
d1310b2e CM |
5080 | |
5081 | int read_extent_buffer_pages(struct extent_io_tree *tree, | |
bb82ab88 | 5082 | struct extent_buffer *eb, u64 start, int wait, |
f188591e | 5083 | get_extent_t *get_extent, int mirror_num) |
d1310b2e CM |
5084 | { |
5085 | unsigned long i; | |
5086 | unsigned long start_i; | |
5087 | struct page *page; | |
5088 | int err; | |
5089 | int ret = 0; | |
ce9adaa5 CM |
5090 | int locked_pages = 0; |
5091 | int all_uptodate = 1; | |
d1310b2e | 5092 | unsigned long num_pages; |
727011e0 | 5093 | unsigned long num_reads = 0; |
a86c12c7 | 5094 | struct bio *bio = NULL; |
c8b97818 | 5095 | unsigned long bio_flags = 0; |
a86c12c7 | 5096 | |
b4ce94de | 5097 | if (test_bit(EXTENT_BUFFER_UPTODATE, &eb->bflags)) |
d1310b2e CM |
5098 | return 0; |
5099 | ||
d1310b2e CM |
5100 | if (start) { |
5101 | WARN_ON(start < eb->start); | |
5102 | start_i = (start >> PAGE_CACHE_SHIFT) - | |
5103 | (eb->start >> PAGE_CACHE_SHIFT); | |
5104 | } else { | |
5105 | start_i = 0; | |
5106 | } | |
5107 | ||
5108 | num_pages = num_extent_pages(eb->start, eb->len); | |
5109 | for (i = start_i; i < num_pages; i++) { | |
fb85fc9a | 5110 | page = eb->pages[i]; |
bb82ab88 | 5111 | if (wait == WAIT_NONE) { |
2db04966 | 5112 | if (!trylock_page(page)) |
ce9adaa5 | 5113 | goto unlock_exit; |
d1310b2e CM |
5114 | } else { |
5115 | lock_page(page); | |
5116 | } | |
ce9adaa5 | 5117 | locked_pages++; |
727011e0 CM |
5118 | if (!PageUptodate(page)) { |
5119 | num_reads++; | |
ce9adaa5 | 5120 | all_uptodate = 0; |
727011e0 | 5121 | } |
ce9adaa5 CM |
5122 | } |
5123 | if (all_uptodate) { | |
5124 | if (start_i == 0) | |
b4ce94de | 5125 | set_bit(EXTENT_BUFFER_UPTODATE, &eb->bflags); |
ce9adaa5 CM |
5126 | goto unlock_exit; |
5127 | } | |
5128 | ||
656f30db | 5129 | clear_bit(EXTENT_BUFFER_READ_ERR, &eb->bflags); |
5cf1ab56 | 5130 | eb->read_mirror = 0; |
0b32f4bb | 5131 | atomic_set(&eb->io_pages, num_reads); |
ce9adaa5 | 5132 | for (i = start_i; i < num_pages; i++) { |
fb85fc9a | 5133 | page = eb->pages[i]; |
ce9adaa5 | 5134 | if (!PageUptodate(page)) { |
f188591e | 5135 | ClearPageError(page); |
a86c12c7 | 5136 | err = __extent_read_full_page(tree, page, |
f188591e | 5137 | get_extent, &bio, |
d4c7ca86 JB |
5138 | mirror_num, &bio_flags, |
5139 | READ | REQ_META); | |
d397712b | 5140 | if (err) |
d1310b2e | 5141 | ret = err; |
d1310b2e CM |
5142 | } else { |
5143 | unlock_page(page); | |
5144 | } | |
5145 | } | |
5146 | ||
355808c2 | 5147 | if (bio) { |
d4c7ca86 JB |
5148 | err = submit_one_bio(READ | REQ_META, bio, mirror_num, |
5149 | bio_flags); | |
79787eaa JM |
5150 | if (err) |
5151 | return err; | |
355808c2 | 5152 | } |
a86c12c7 | 5153 | |
bb82ab88 | 5154 | if (ret || wait != WAIT_COMPLETE) |
d1310b2e | 5155 | return ret; |
d397712b | 5156 | |
d1310b2e | 5157 | for (i = start_i; i < num_pages; i++) { |
fb85fc9a | 5158 | page = eb->pages[i]; |
d1310b2e | 5159 | wait_on_page_locked(page); |
d397712b | 5160 | if (!PageUptodate(page)) |
d1310b2e | 5161 | ret = -EIO; |
d1310b2e | 5162 | } |
d397712b | 5163 | |
d1310b2e | 5164 | return ret; |
ce9adaa5 CM |
5165 | |
5166 | unlock_exit: | |
5167 | i = start_i; | |
d397712b | 5168 | while (locked_pages > 0) { |
fb85fc9a | 5169 | page = eb->pages[i]; |
ce9adaa5 CM |
5170 | i++; |
5171 | unlock_page(page); | |
5172 | locked_pages--; | |
5173 | } | |
5174 | return ret; | |
d1310b2e | 5175 | } |
d1310b2e CM |
5176 | |
5177 | void read_extent_buffer(struct extent_buffer *eb, void *dstv, | |
5178 | unsigned long start, | |
5179 | unsigned long len) | |
5180 | { | |
5181 | size_t cur; | |
5182 | size_t offset; | |
5183 | struct page *page; | |
5184 | char *kaddr; | |
5185 | char *dst = (char *)dstv; | |
5186 | size_t start_offset = eb->start & ((u64)PAGE_CACHE_SIZE - 1); | |
5187 | unsigned long i = (start_offset + start) >> PAGE_CACHE_SHIFT; | |
d1310b2e CM |
5188 | |
5189 | WARN_ON(start > eb->len); | |
5190 | WARN_ON(start + len > eb->start + eb->len); | |
5191 | ||
778746b5 | 5192 | offset = (start_offset + start) & (PAGE_CACHE_SIZE - 1); |
d1310b2e | 5193 | |
d397712b | 5194 | while (len > 0) { |
fb85fc9a | 5195 | page = eb->pages[i]; |
d1310b2e CM |
5196 | |
5197 | cur = min(len, (PAGE_CACHE_SIZE - offset)); | |
a6591715 | 5198 | kaddr = page_address(page); |
d1310b2e | 5199 | memcpy(dst, kaddr + offset, cur); |
d1310b2e CM |
5200 | |
5201 | dst += cur; | |
5202 | len -= cur; | |
5203 | offset = 0; | |
5204 | i++; | |
5205 | } | |
5206 | } | |
d1310b2e | 5207 | |
550ac1d8 GH |
5208 | int read_extent_buffer_to_user(struct extent_buffer *eb, void __user *dstv, |
5209 | unsigned long start, | |
5210 | unsigned long len) | |
5211 | { | |
5212 | size_t cur; | |
5213 | size_t offset; | |
5214 | struct page *page; | |
5215 | char *kaddr; | |
5216 | char __user *dst = (char __user *)dstv; | |
5217 | size_t start_offset = eb->start & ((u64)PAGE_CACHE_SIZE - 1); | |
5218 | unsigned long i = (start_offset + start) >> PAGE_CACHE_SHIFT; | |
5219 | int ret = 0; | |
5220 | ||
5221 | WARN_ON(start > eb->len); | |
5222 | WARN_ON(start + len > eb->start + eb->len); | |
5223 | ||
5224 | offset = (start_offset + start) & (PAGE_CACHE_SIZE - 1); | |
5225 | ||
5226 | while (len > 0) { | |
fb85fc9a | 5227 | page = eb->pages[i]; |
550ac1d8 GH |
5228 | |
5229 | cur = min(len, (PAGE_CACHE_SIZE - offset)); | |
5230 | kaddr = page_address(page); | |
5231 | if (copy_to_user(dst, kaddr + offset, cur)) { | |
5232 | ret = -EFAULT; | |
5233 | break; | |
5234 | } | |
5235 | ||
5236 | dst += cur; | |
5237 | len -= cur; | |
5238 | offset = 0; | |
5239 | i++; | |
5240 | } | |
5241 | ||
5242 | return ret; | |
5243 | } | |
5244 | ||
d1310b2e | 5245 | int map_private_extent_buffer(struct extent_buffer *eb, unsigned long start, |
a6591715 | 5246 | unsigned long min_len, char **map, |
d1310b2e | 5247 | unsigned long *map_start, |
a6591715 | 5248 | unsigned long *map_len) |
d1310b2e CM |
5249 | { |
5250 | size_t offset = start & (PAGE_CACHE_SIZE - 1); | |
5251 | char *kaddr; | |
5252 | struct page *p; | |
5253 | size_t start_offset = eb->start & ((u64)PAGE_CACHE_SIZE - 1); | |
5254 | unsigned long i = (start_offset + start) >> PAGE_CACHE_SHIFT; | |
5255 | unsigned long end_i = (start_offset + start + min_len - 1) >> | |
5256 | PAGE_CACHE_SHIFT; | |
5257 | ||
5258 | if (i != end_i) | |
5259 | return -EINVAL; | |
5260 | ||
5261 | if (i == 0) { | |
5262 | offset = start_offset; | |
5263 | *map_start = 0; | |
5264 | } else { | |
5265 | offset = 0; | |
5266 | *map_start = ((u64)i << PAGE_CACHE_SHIFT) - start_offset; | |
5267 | } | |
d397712b | 5268 | |
d1310b2e | 5269 | if (start + min_len > eb->len) { |
31b1a2bd | 5270 | WARN(1, KERN_ERR "btrfs bad mapping eb start %llu len %lu, " |
c1c9ff7c GU |
5271 | "wanted %lu %lu\n", |
5272 | eb->start, eb->len, start, min_len); | |
85026533 | 5273 | return -EINVAL; |
d1310b2e CM |
5274 | } |
5275 | ||
fb85fc9a | 5276 | p = eb->pages[i]; |
a6591715 | 5277 | kaddr = page_address(p); |
d1310b2e CM |
5278 | *map = kaddr + offset; |
5279 | *map_len = PAGE_CACHE_SIZE - offset; | |
5280 | return 0; | |
5281 | } | |
d1310b2e | 5282 | |
d1310b2e CM |
5283 | int memcmp_extent_buffer(struct extent_buffer *eb, const void *ptrv, |
5284 | unsigned long start, | |
5285 | unsigned long len) | |
5286 | { | |
5287 | size_t cur; | |
5288 | size_t offset; | |
5289 | struct page *page; | |
5290 | char *kaddr; | |
5291 | char *ptr = (char *)ptrv; | |
5292 | size_t start_offset = eb->start & ((u64)PAGE_CACHE_SIZE - 1); | |
5293 | unsigned long i = (start_offset + start) >> PAGE_CACHE_SHIFT; | |
5294 | int ret = 0; | |
5295 | ||
5296 | WARN_ON(start > eb->len); | |
5297 | WARN_ON(start + len > eb->start + eb->len); | |
5298 | ||
778746b5 | 5299 | offset = (start_offset + start) & (PAGE_CACHE_SIZE - 1); |
d1310b2e | 5300 | |
d397712b | 5301 | while (len > 0) { |
fb85fc9a | 5302 | page = eb->pages[i]; |
d1310b2e CM |
5303 | |
5304 | cur = min(len, (PAGE_CACHE_SIZE - offset)); | |
5305 | ||
a6591715 | 5306 | kaddr = page_address(page); |
d1310b2e | 5307 | ret = memcmp(ptr, kaddr + offset, cur); |
d1310b2e CM |
5308 | if (ret) |
5309 | break; | |
5310 | ||
5311 | ptr += cur; | |
5312 | len -= cur; | |
5313 | offset = 0; | |
5314 | i++; | |
5315 | } | |
5316 | return ret; | |
5317 | } | |
d1310b2e CM |
5318 | |
5319 | void write_extent_buffer(struct extent_buffer *eb, const void *srcv, | |
5320 | unsigned long start, unsigned long len) | |
5321 | { | |
5322 | size_t cur; | |
5323 | size_t offset; | |
5324 | struct page *page; | |
5325 | char *kaddr; | |
5326 | char *src = (char *)srcv; | |
5327 | size_t start_offset = eb->start & ((u64)PAGE_CACHE_SIZE - 1); | |
5328 | unsigned long i = (start_offset + start) >> PAGE_CACHE_SHIFT; | |
5329 | ||
5330 | WARN_ON(start > eb->len); | |
5331 | WARN_ON(start + len > eb->start + eb->len); | |
5332 | ||
778746b5 | 5333 | offset = (start_offset + start) & (PAGE_CACHE_SIZE - 1); |
d1310b2e | 5334 | |
d397712b | 5335 | while (len > 0) { |
fb85fc9a | 5336 | page = eb->pages[i]; |
d1310b2e CM |
5337 | WARN_ON(!PageUptodate(page)); |
5338 | ||
5339 | cur = min(len, PAGE_CACHE_SIZE - offset); | |
a6591715 | 5340 | kaddr = page_address(page); |
d1310b2e | 5341 | memcpy(kaddr + offset, src, cur); |
d1310b2e CM |
5342 | |
5343 | src += cur; | |
5344 | len -= cur; | |
5345 | offset = 0; | |
5346 | i++; | |
5347 | } | |
5348 | } | |
d1310b2e CM |
5349 | |
5350 | void memset_extent_buffer(struct extent_buffer *eb, char c, | |
5351 | unsigned long start, unsigned long len) | |
5352 | { | |
5353 | size_t cur; | |
5354 | size_t offset; | |
5355 | struct page *page; | |
5356 | char *kaddr; | |
5357 | size_t start_offset = eb->start & ((u64)PAGE_CACHE_SIZE - 1); | |
5358 | unsigned long i = (start_offset + start) >> PAGE_CACHE_SHIFT; | |
5359 | ||
5360 | WARN_ON(start > eb->len); | |
5361 | WARN_ON(start + len > eb->start + eb->len); | |
5362 | ||
778746b5 | 5363 | offset = (start_offset + start) & (PAGE_CACHE_SIZE - 1); |
d1310b2e | 5364 | |
d397712b | 5365 | while (len > 0) { |
fb85fc9a | 5366 | page = eb->pages[i]; |
d1310b2e CM |
5367 | WARN_ON(!PageUptodate(page)); |
5368 | ||
5369 | cur = min(len, PAGE_CACHE_SIZE - offset); | |
a6591715 | 5370 | kaddr = page_address(page); |
d1310b2e | 5371 | memset(kaddr + offset, c, cur); |
d1310b2e CM |
5372 | |
5373 | len -= cur; | |
5374 | offset = 0; | |
5375 | i++; | |
5376 | } | |
5377 | } | |
d1310b2e CM |
5378 | |
5379 | void copy_extent_buffer(struct extent_buffer *dst, struct extent_buffer *src, | |
5380 | unsigned long dst_offset, unsigned long src_offset, | |
5381 | unsigned long len) | |
5382 | { | |
5383 | u64 dst_len = dst->len; | |
5384 | size_t cur; | |
5385 | size_t offset; | |
5386 | struct page *page; | |
5387 | char *kaddr; | |
5388 | size_t start_offset = dst->start & ((u64)PAGE_CACHE_SIZE - 1); | |
5389 | unsigned long i = (start_offset + dst_offset) >> PAGE_CACHE_SHIFT; | |
5390 | ||
5391 | WARN_ON(src->len != dst_len); | |
5392 | ||
5393 | offset = (start_offset + dst_offset) & | |
778746b5 | 5394 | (PAGE_CACHE_SIZE - 1); |
d1310b2e | 5395 | |
d397712b | 5396 | while (len > 0) { |
fb85fc9a | 5397 | page = dst->pages[i]; |
d1310b2e CM |
5398 | WARN_ON(!PageUptodate(page)); |
5399 | ||
5400 | cur = min(len, (unsigned long)(PAGE_CACHE_SIZE - offset)); | |
5401 | ||
a6591715 | 5402 | kaddr = page_address(page); |
d1310b2e | 5403 | read_extent_buffer(src, kaddr + offset, src_offset, cur); |
d1310b2e CM |
5404 | |
5405 | src_offset += cur; | |
5406 | len -= cur; | |
5407 | offset = 0; | |
5408 | i++; | |
5409 | } | |
5410 | } | |
d1310b2e | 5411 | |
3387206f ST |
5412 | static inline bool areas_overlap(unsigned long src, unsigned long dst, unsigned long len) |
5413 | { | |
5414 | unsigned long distance = (src > dst) ? src - dst : dst - src; | |
5415 | return distance < len; | |
5416 | } | |
5417 | ||
d1310b2e CM |
5418 | static void copy_pages(struct page *dst_page, struct page *src_page, |
5419 | unsigned long dst_off, unsigned long src_off, | |
5420 | unsigned long len) | |
5421 | { | |
a6591715 | 5422 | char *dst_kaddr = page_address(dst_page); |
d1310b2e | 5423 | char *src_kaddr; |
727011e0 | 5424 | int must_memmove = 0; |
d1310b2e | 5425 | |
3387206f | 5426 | if (dst_page != src_page) { |
a6591715 | 5427 | src_kaddr = page_address(src_page); |
3387206f | 5428 | } else { |
d1310b2e | 5429 | src_kaddr = dst_kaddr; |
727011e0 CM |
5430 | if (areas_overlap(src_off, dst_off, len)) |
5431 | must_memmove = 1; | |
3387206f | 5432 | } |
d1310b2e | 5433 | |
727011e0 CM |
5434 | if (must_memmove) |
5435 | memmove(dst_kaddr + dst_off, src_kaddr + src_off, len); | |
5436 | else | |
5437 | memcpy(dst_kaddr + dst_off, src_kaddr + src_off, len); | |
d1310b2e CM |
5438 | } |
5439 | ||
5440 | void memcpy_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset, | |
5441 | unsigned long src_offset, unsigned long len) | |
5442 | { | |
5443 | size_t cur; | |
5444 | size_t dst_off_in_page; | |
5445 | size_t src_off_in_page; | |
5446 | size_t start_offset = dst->start & ((u64)PAGE_CACHE_SIZE - 1); | |
5447 | unsigned long dst_i; | |
5448 | unsigned long src_i; | |
5449 | ||
5450 | if (src_offset + len > dst->len) { | |
efe120a0 | 5451 | printk(KERN_ERR "BTRFS: memmove bogus src_offset %lu move " |
d397712b | 5452 | "len %lu dst len %lu\n", src_offset, len, dst->len); |
d1310b2e CM |
5453 | BUG_ON(1); |
5454 | } | |
5455 | if (dst_offset + len > dst->len) { | |
efe120a0 | 5456 | printk(KERN_ERR "BTRFS: memmove bogus dst_offset %lu move " |
d397712b | 5457 | "len %lu dst len %lu\n", dst_offset, len, dst->len); |
d1310b2e CM |
5458 | BUG_ON(1); |
5459 | } | |
5460 | ||
d397712b | 5461 | while (len > 0) { |
d1310b2e | 5462 | dst_off_in_page = (start_offset + dst_offset) & |
778746b5 | 5463 | (PAGE_CACHE_SIZE - 1); |
d1310b2e | 5464 | src_off_in_page = (start_offset + src_offset) & |
778746b5 | 5465 | (PAGE_CACHE_SIZE - 1); |
d1310b2e CM |
5466 | |
5467 | dst_i = (start_offset + dst_offset) >> PAGE_CACHE_SHIFT; | |
5468 | src_i = (start_offset + src_offset) >> PAGE_CACHE_SHIFT; | |
5469 | ||
5470 | cur = min(len, (unsigned long)(PAGE_CACHE_SIZE - | |
5471 | src_off_in_page)); | |
5472 | cur = min_t(unsigned long, cur, | |
5473 | (unsigned long)(PAGE_CACHE_SIZE - dst_off_in_page)); | |
5474 | ||
fb85fc9a | 5475 | copy_pages(dst->pages[dst_i], dst->pages[src_i], |
d1310b2e CM |
5476 | dst_off_in_page, src_off_in_page, cur); |
5477 | ||
5478 | src_offset += cur; | |
5479 | dst_offset += cur; | |
5480 | len -= cur; | |
5481 | } | |
5482 | } | |
d1310b2e CM |
5483 | |
5484 | void memmove_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset, | |
5485 | unsigned long src_offset, unsigned long len) | |
5486 | { | |
5487 | size_t cur; | |
5488 | size_t dst_off_in_page; | |
5489 | size_t src_off_in_page; | |
5490 | unsigned long dst_end = dst_offset + len - 1; | |
5491 | unsigned long src_end = src_offset + len - 1; | |
5492 | size_t start_offset = dst->start & ((u64)PAGE_CACHE_SIZE - 1); | |
5493 | unsigned long dst_i; | |
5494 | unsigned long src_i; | |
5495 | ||
5496 | if (src_offset + len > dst->len) { | |
efe120a0 | 5497 | printk(KERN_ERR "BTRFS: memmove bogus src_offset %lu move " |
d397712b | 5498 | "len %lu len %lu\n", src_offset, len, dst->len); |
d1310b2e CM |
5499 | BUG_ON(1); |
5500 | } | |
5501 | if (dst_offset + len > dst->len) { | |
efe120a0 | 5502 | printk(KERN_ERR "BTRFS: memmove bogus dst_offset %lu move " |
d397712b | 5503 | "len %lu len %lu\n", dst_offset, len, dst->len); |
d1310b2e CM |
5504 | BUG_ON(1); |
5505 | } | |
727011e0 | 5506 | if (dst_offset < src_offset) { |
d1310b2e CM |
5507 | memcpy_extent_buffer(dst, dst_offset, src_offset, len); |
5508 | return; | |
5509 | } | |
d397712b | 5510 | while (len > 0) { |
d1310b2e CM |
5511 | dst_i = (start_offset + dst_end) >> PAGE_CACHE_SHIFT; |
5512 | src_i = (start_offset + src_end) >> PAGE_CACHE_SHIFT; | |
5513 | ||
5514 | dst_off_in_page = (start_offset + dst_end) & | |
778746b5 | 5515 | (PAGE_CACHE_SIZE - 1); |
d1310b2e | 5516 | src_off_in_page = (start_offset + src_end) & |
778746b5 | 5517 | (PAGE_CACHE_SIZE - 1); |
d1310b2e CM |
5518 | |
5519 | cur = min_t(unsigned long, len, src_off_in_page + 1); | |
5520 | cur = min(cur, dst_off_in_page + 1); | |
fb85fc9a | 5521 | copy_pages(dst->pages[dst_i], dst->pages[src_i], |
d1310b2e CM |
5522 | dst_off_in_page - cur + 1, |
5523 | src_off_in_page - cur + 1, cur); | |
5524 | ||
5525 | dst_end -= cur; | |
5526 | src_end -= cur; | |
5527 | len -= cur; | |
5528 | } | |
5529 | } | |
6af118ce | 5530 | |
f7a52a40 | 5531 | int try_release_extent_buffer(struct page *page) |
19fe0a8b | 5532 | { |
6af118ce | 5533 | struct extent_buffer *eb; |
6af118ce | 5534 | |
3083ee2e JB |
5535 | /* |
5536 | * We need to make sure noboody is attaching this page to an eb right | |
5537 | * now. | |
5538 | */ | |
5539 | spin_lock(&page->mapping->private_lock); | |
5540 | if (!PagePrivate(page)) { | |
5541 | spin_unlock(&page->mapping->private_lock); | |
4f2de97a | 5542 | return 1; |
45f49bce | 5543 | } |
6af118ce | 5544 | |
3083ee2e JB |
5545 | eb = (struct extent_buffer *)page->private; |
5546 | BUG_ON(!eb); | |
19fe0a8b MX |
5547 | |
5548 | /* | |
3083ee2e JB |
5549 | * This is a little awful but should be ok, we need to make sure that |
5550 | * the eb doesn't disappear out from under us while we're looking at | |
5551 | * this page. | |
19fe0a8b | 5552 | */ |
3083ee2e | 5553 | spin_lock(&eb->refs_lock); |
0b32f4bb | 5554 | if (atomic_read(&eb->refs) != 1 || extent_buffer_under_io(eb)) { |
3083ee2e JB |
5555 | spin_unlock(&eb->refs_lock); |
5556 | spin_unlock(&page->mapping->private_lock); | |
5557 | return 0; | |
b9473439 | 5558 | } |
3083ee2e | 5559 | spin_unlock(&page->mapping->private_lock); |
897ca6e9 | 5560 | |
19fe0a8b | 5561 | /* |
3083ee2e JB |
5562 | * If tree ref isn't set then we know the ref on this eb is a real ref, |
5563 | * so just return, this page will likely be freed soon anyway. | |
19fe0a8b | 5564 | */ |
3083ee2e JB |
5565 | if (!test_and_clear_bit(EXTENT_BUFFER_TREE_REF, &eb->bflags)) { |
5566 | spin_unlock(&eb->refs_lock); | |
5567 | return 0; | |
b9473439 | 5568 | } |
19fe0a8b | 5569 | |
f7a52a40 | 5570 | return release_extent_buffer(eb); |
6af118ce | 5571 | } |