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Commit | Line | Data |
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d1310b2e CM |
1 | #include <linux/bitops.h> |
2 | #include <linux/slab.h> | |
3 | #include <linux/bio.h> | |
4 | #include <linux/mm.h> | |
d1310b2e CM |
5 | #include <linux/pagemap.h> |
6 | #include <linux/page-flags.h> | |
d1310b2e CM |
7 | #include <linux/spinlock.h> |
8 | #include <linux/blkdev.h> | |
9 | #include <linux/swap.h> | |
d1310b2e CM |
10 | #include <linux/writeback.h> |
11 | #include <linux/pagevec.h> | |
268bb0ce | 12 | #include <linux/prefetch.h> |
90a887c9 | 13 | #include <linux/cleancache.h> |
d1310b2e CM |
14 | #include "extent_io.h" |
15 | #include "extent_map.h" | |
902b22f3 DW |
16 | #include "ctree.h" |
17 | #include "btrfs_inode.h" | |
4a54c8c1 | 18 | #include "volumes.h" |
21adbd5c | 19 | #include "check-integrity.h" |
0b32f4bb | 20 | #include "locking.h" |
606686ee | 21 | #include "rcu-string.h" |
fe09e16c | 22 | #include "backref.h" |
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 | |
6d49ba1b | 28 | #ifdef CONFIG_BTRFS_DEBUG |
d1310b2e CM |
29 | static LIST_HEAD(buffers); |
30 | static LIST_HEAD(states); | |
4bef0848 | 31 | |
d397712b | 32 | static DEFINE_SPINLOCK(leak_lock); |
6d49ba1b ES |
33 | |
34 | static inline | |
35 | void btrfs_leak_debug_add(struct list_head *new, struct list_head *head) | |
36 | { | |
37 | unsigned long flags; | |
38 | ||
39 | spin_lock_irqsave(&leak_lock, flags); | |
40 | list_add(new, head); | |
41 | spin_unlock_irqrestore(&leak_lock, flags); | |
42 | } | |
43 | ||
44 | static inline | |
45 | void btrfs_leak_debug_del(struct list_head *entry) | |
46 | { | |
47 | unsigned long flags; | |
48 | ||
49 | spin_lock_irqsave(&leak_lock, flags); | |
50 | list_del(entry); | |
51 | spin_unlock_irqrestore(&leak_lock, flags); | |
52 | } | |
53 | ||
54 | static inline | |
55 | void btrfs_leak_debug_check(void) | |
56 | { | |
57 | struct extent_state *state; | |
58 | struct extent_buffer *eb; | |
59 | ||
60 | while (!list_empty(&states)) { | |
61 | state = list_entry(states.next, struct extent_state, leak_list); | |
62 | printk(KERN_ERR "btrfs state leak: start %llu end %llu " | |
63 | "state %lu in tree %p refs %d\n", | |
c1c9ff7c GU |
64 | state->start, state->end, state->state, state->tree, |
65 | atomic_read(&state->refs)); | |
6d49ba1b ES |
66 | list_del(&state->leak_list); |
67 | kmem_cache_free(extent_state_cache, state); | |
68 | } | |
69 | ||
70 | while (!list_empty(&buffers)) { | |
71 | eb = list_entry(buffers.next, struct extent_buffer, leak_list); | |
72 | printk(KERN_ERR "btrfs buffer leak start %llu len %lu " | |
c1c9ff7c GU |
73 | "refs %d\n", |
74 | eb->start, eb->len, atomic_read(&eb->refs)); | |
6d49ba1b ES |
75 | list_del(&eb->leak_list); |
76 | kmem_cache_free(extent_buffer_cache, eb); | |
77 | } | |
78 | } | |
8d599ae1 DS |
79 | |
80 | #define btrfs_debug_check_extent_io_range(inode, start, end) \ | |
81 | __btrfs_debug_check_extent_io_range(__func__, (inode), (start), (end)) | |
82 | static inline void __btrfs_debug_check_extent_io_range(const char *caller, | |
83 | struct inode *inode, u64 start, u64 end) | |
84 | { | |
85 | u64 isize = i_size_read(inode); | |
86 | ||
87 | if (end >= PAGE_SIZE && (end % 2) == 0 && end != isize - 1) { | |
88 | printk_ratelimited(KERN_DEBUG | |
89 | "btrfs: %s: ino %llu isize %llu odd range [%llu,%llu]\n", | |
c1c9ff7c | 90 | caller, btrfs_ino(inode), isize, start, end); |
8d599ae1 DS |
91 | } |
92 | } | |
6d49ba1b ES |
93 | #else |
94 | #define btrfs_leak_debug_add(new, head) do {} while (0) | |
95 | #define btrfs_leak_debug_del(entry) do {} while (0) | |
96 | #define btrfs_leak_debug_check() do {} while (0) | |
8d599ae1 | 97 | #define btrfs_debug_check_extent_io_range(c, s, e) do {} while (0) |
4bef0848 | 98 | #endif |
d1310b2e | 99 | |
d1310b2e CM |
100 | #define BUFFER_LRU_MAX 64 |
101 | ||
102 | struct tree_entry { | |
103 | u64 start; | |
104 | u64 end; | |
d1310b2e CM |
105 | struct rb_node rb_node; |
106 | }; | |
107 | ||
108 | struct extent_page_data { | |
109 | struct bio *bio; | |
110 | struct extent_io_tree *tree; | |
111 | get_extent_t *get_extent; | |
de0022b9 | 112 | unsigned long bio_flags; |
771ed689 CM |
113 | |
114 | /* tells writepage not to lock the state bits for this range | |
115 | * it still does the unlocking | |
116 | */ | |
ffbd517d CM |
117 | unsigned int extent_locked:1; |
118 | ||
119 | /* tells the submit_bio code to use a WRITE_SYNC */ | |
120 | unsigned int sync_io:1; | |
d1310b2e CM |
121 | }; |
122 | ||
0b32f4bb | 123 | static noinline void flush_write_bio(void *data); |
c2d904e0 JM |
124 | static inline struct btrfs_fs_info * |
125 | tree_fs_info(struct extent_io_tree *tree) | |
126 | { | |
127 | return btrfs_sb(tree->mapping->host->i_sb); | |
128 | } | |
0b32f4bb | 129 | |
d1310b2e CM |
130 | int __init extent_io_init(void) |
131 | { | |
837e1972 | 132 | extent_state_cache = kmem_cache_create("btrfs_extent_state", |
9601e3f6 CH |
133 | sizeof(struct extent_state), 0, |
134 | SLAB_RECLAIM_ACCOUNT | SLAB_MEM_SPREAD, NULL); | |
d1310b2e CM |
135 | if (!extent_state_cache) |
136 | return -ENOMEM; | |
137 | ||
837e1972 | 138 | extent_buffer_cache = kmem_cache_create("btrfs_extent_buffer", |
9601e3f6 CH |
139 | sizeof(struct extent_buffer), 0, |
140 | SLAB_RECLAIM_ACCOUNT | SLAB_MEM_SPREAD, NULL); | |
d1310b2e CM |
141 | if (!extent_buffer_cache) |
142 | goto free_state_cache; | |
9be3395b CM |
143 | |
144 | btrfs_bioset = bioset_create(BIO_POOL_SIZE, | |
145 | offsetof(struct btrfs_io_bio, bio)); | |
146 | if (!btrfs_bioset) | |
147 | goto free_buffer_cache; | |
b208c2f7 DW |
148 | |
149 | if (bioset_integrity_create(btrfs_bioset, BIO_POOL_SIZE)) | |
150 | goto free_bioset; | |
151 | ||
d1310b2e CM |
152 | return 0; |
153 | ||
b208c2f7 DW |
154 | free_bioset: |
155 | bioset_free(btrfs_bioset); | |
156 | btrfs_bioset = NULL; | |
157 | ||
9be3395b CM |
158 | free_buffer_cache: |
159 | kmem_cache_destroy(extent_buffer_cache); | |
160 | extent_buffer_cache = NULL; | |
161 | ||
d1310b2e CM |
162 | free_state_cache: |
163 | kmem_cache_destroy(extent_state_cache); | |
9be3395b | 164 | extent_state_cache = NULL; |
d1310b2e CM |
165 | return -ENOMEM; |
166 | } | |
167 | ||
168 | void extent_io_exit(void) | |
169 | { | |
6d49ba1b | 170 | btrfs_leak_debug_check(); |
8c0a8537 KS |
171 | |
172 | /* | |
173 | * Make sure all delayed rcu free are flushed before we | |
174 | * destroy caches. | |
175 | */ | |
176 | rcu_barrier(); | |
d1310b2e CM |
177 | if (extent_state_cache) |
178 | kmem_cache_destroy(extent_state_cache); | |
179 | if (extent_buffer_cache) | |
180 | kmem_cache_destroy(extent_buffer_cache); | |
9be3395b CM |
181 | if (btrfs_bioset) |
182 | bioset_free(btrfs_bioset); | |
d1310b2e CM |
183 | } |
184 | ||
185 | void extent_io_tree_init(struct extent_io_tree *tree, | |
f993c883 | 186 | struct address_space *mapping) |
d1310b2e | 187 | { |
6bef4d31 | 188 | tree->state = RB_ROOT; |
19fe0a8b | 189 | INIT_RADIX_TREE(&tree->buffer, GFP_ATOMIC); |
d1310b2e CM |
190 | tree->ops = NULL; |
191 | tree->dirty_bytes = 0; | |
70dec807 | 192 | spin_lock_init(&tree->lock); |
6af118ce | 193 | spin_lock_init(&tree->buffer_lock); |
d1310b2e | 194 | tree->mapping = mapping; |
d1310b2e | 195 | } |
d1310b2e | 196 | |
b2950863 | 197 | static struct extent_state *alloc_extent_state(gfp_t mask) |
d1310b2e CM |
198 | { |
199 | struct extent_state *state; | |
d1310b2e CM |
200 | |
201 | state = kmem_cache_alloc(extent_state_cache, mask); | |
2b114d1d | 202 | if (!state) |
d1310b2e CM |
203 | return state; |
204 | state->state = 0; | |
d1310b2e | 205 | state->private = 0; |
70dec807 | 206 | state->tree = NULL; |
6d49ba1b | 207 | btrfs_leak_debug_add(&state->leak_list, &states); |
d1310b2e CM |
208 | atomic_set(&state->refs, 1); |
209 | init_waitqueue_head(&state->wq); | |
143bede5 | 210 | trace_alloc_extent_state(state, mask, _RET_IP_); |
d1310b2e CM |
211 | return state; |
212 | } | |
d1310b2e | 213 | |
4845e44f | 214 | void free_extent_state(struct extent_state *state) |
d1310b2e | 215 | { |
d1310b2e CM |
216 | if (!state) |
217 | return; | |
218 | if (atomic_dec_and_test(&state->refs)) { | |
70dec807 | 219 | WARN_ON(state->tree); |
6d49ba1b | 220 | btrfs_leak_debug_del(&state->leak_list); |
143bede5 | 221 | trace_free_extent_state(state, _RET_IP_); |
d1310b2e CM |
222 | kmem_cache_free(extent_state_cache, state); |
223 | } | |
224 | } | |
d1310b2e CM |
225 | |
226 | static struct rb_node *tree_insert(struct rb_root *root, u64 offset, | |
227 | struct rb_node *node) | |
228 | { | |
d397712b CM |
229 | struct rb_node **p = &root->rb_node; |
230 | struct rb_node *parent = NULL; | |
d1310b2e CM |
231 | struct tree_entry *entry; |
232 | ||
d397712b | 233 | while (*p) { |
d1310b2e CM |
234 | parent = *p; |
235 | entry = rb_entry(parent, struct tree_entry, rb_node); | |
236 | ||
237 | if (offset < entry->start) | |
238 | p = &(*p)->rb_left; | |
239 | else if (offset > entry->end) | |
240 | p = &(*p)->rb_right; | |
241 | else | |
242 | return parent; | |
243 | } | |
244 | ||
d1310b2e CM |
245 | rb_link_node(node, parent, p); |
246 | rb_insert_color(node, root); | |
247 | return NULL; | |
248 | } | |
249 | ||
80ea96b1 | 250 | static struct rb_node *__etree_search(struct extent_io_tree *tree, u64 offset, |
d1310b2e CM |
251 | struct rb_node **prev_ret, |
252 | struct rb_node **next_ret) | |
253 | { | |
80ea96b1 | 254 | struct rb_root *root = &tree->state; |
d397712b | 255 | struct rb_node *n = root->rb_node; |
d1310b2e CM |
256 | struct rb_node *prev = NULL; |
257 | struct rb_node *orig_prev = NULL; | |
258 | struct tree_entry *entry; | |
259 | struct tree_entry *prev_entry = NULL; | |
260 | ||
d397712b | 261 | while (n) { |
d1310b2e CM |
262 | entry = rb_entry(n, struct tree_entry, rb_node); |
263 | prev = n; | |
264 | prev_entry = entry; | |
265 | ||
266 | if (offset < entry->start) | |
267 | n = n->rb_left; | |
268 | else if (offset > entry->end) | |
269 | n = n->rb_right; | |
d397712b | 270 | else |
d1310b2e CM |
271 | return n; |
272 | } | |
273 | ||
274 | if (prev_ret) { | |
275 | orig_prev = prev; | |
d397712b | 276 | while (prev && offset > prev_entry->end) { |
d1310b2e CM |
277 | prev = rb_next(prev); |
278 | prev_entry = rb_entry(prev, struct tree_entry, rb_node); | |
279 | } | |
280 | *prev_ret = prev; | |
281 | prev = orig_prev; | |
282 | } | |
283 | ||
284 | if (next_ret) { | |
285 | prev_entry = rb_entry(prev, struct tree_entry, rb_node); | |
d397712b | 286 | while (prev && offset < prev_entry->start) { |
d1310b2e CM |
287 | prev = rb_prev(prev); |
288 | prev_entry = rb_entry(prev, struct tree_entry, rb_node); | |
289 | } | |
290 | *next_ret = prev; | |
291 | } | |
292 | return NULL; | |
293 | } | |
294 | ||
80ea96b1 CM |
295 | static inline struct rb_node *tree_search(struct extent_io_tree *tree, |
296 | u64 offset) | |
d1310b2e | 297 | { |
70dec807 | 298 | struct rb_node *prev = NULL; |
d1310b2e | 299 | struct rb_node *ret; |
70dec807 | 300 | |
80ea96b1 | 301 | ret = __etree_search(tree, offset, &prev, NULL); |
d397712b | 302 | if (!ret) |
d1310b2e CM |
303 | return prev; |
304 | return ret; | |
305 | } | |
306 | ||
9ed74f2d JB |
307 | static void merge_cb(struct extent_io_tree *tree, struct extent_state *new, |
308 | struct extent_state *other) | |
309 | { | |
310 | if (tree->ops && tree->ops->merge_extent_hook) | |
311 | tree->ops->merge_extent_hook(tree->mapping->host, new, | |
312 | other); | |
313 | } | |
314 | ||
d1310b2e CM |
315 | /* |
316 | * utility function to look for merge candidates inside a given range. | |
317 | * Any extents with matching state are merged together into a single | |
318 | * extent in the tree. Extents with EXTENT_IO in their state field | |
319 | * are not merged because the end_io handlers need to be able to do | |
320 | * operations on them without sleeping (or doing allocations/splits). | |
321 | * | |
322 | * This should be called with the tree lock held. | |
323 | */ | |
1bf85046 JM |
324 | static void merge_state(struct extent_io_tree *tree, |
325 | struct extent_state *state) | |
d1310b2e CM |
326 | { |
327 | struct extent_state *other; | |
328 | struct rb_node *other_node; | |
329 | ||
5b21f2ed | 330 | if (state->state & (EXTENT_IOBITS | EXTENT_BOUNDARY)) |
1bf85046 | 331 | return; |
d1310b2e CM |
332 | |
333 | other_node = rb_prev(&state->rb_node); | |
334 | if (other_node) { | |
335 | other = rb_entry(other_node, struct extent_state, rb_node); | |
336 | if (other->end == state->start - 1 && | |
337 | other->state == state->state) { | |
9ed74f2d | 338 | merge_cb(tree, state, other); |
d1310b2e | 339 | state->start = other->start; |
70dec807 | 340 | other->tree = NULL; |
d1310b2e CM |
341 | rb_erase(&other->rb_node, &tree->state); |
342 | free_extent_state(other); | |
343 | } | |
344 | } | |
345 | other_node = rb_next(&state->rb_node); | |
346 | if (other_node) { | |
347 | other = rb_entry(other_node, struct extent_state, rb_node); | |
348 | if (other->start == state->end + 1 && | |
349 | other->state == state->state) { | |
9ed74f2d | 350 | merge_cb(tree, state, other); |
df98b6e2 JB |
351 | state->end = other->end; |
352 | other->tree = NULL; | |
353 | rb_erase(&other->rb_node, &tree->state); | |
354 | free_extent_state(other); | |
d1310b2e CM |
355 | } |
356 | } | |
d1310b2e CM |
357 | } |
358 | ||
1bf85046 | 359 | static void set_state_cb(struct extent_io_tree *tree, |
41074888 | 360 | struct extent_state *state, unsigned long *bits) |
291d673e | 361 | { |
1bf85046 JM |
362 | if (tree->ops && tree->ops->set_bit_hook) |
363 | tree->ops->set_bit_hook(tree->mapping->host, state, bits); | |
291d673e CM |
364 | } |
365 | ||
366 | static void clear_state_cb(struct extent_io_tree *tree, | |
41074888 | 367 | struct extent_state *state, unsigned long *bits) |
291d673e | 368 | { |
9ed74f2d JB |
369 | if (tree->ops && tree->ops->clear_bit_hook) |
370 | tree->ops->clear_bit_hook(tree->mapping->host, state, bits); | |
291d673e CM |
371 | } |
372 | ||
3150b699 | 373 | static void set_state_bits(struct extent_io_tree *tree, |
41074888 | 374 | struct extent_state *state, unsigned long *bits); |
3150b699 | 375 | |
d1310b2e CM |
376 | /* |
377 | * insert an extent_state struct into the tree. 'bits' are set on the | |
378 | * struct before it is inserted. | |
379 | * | |
380 | * This may return -EEXIST if the extent is already there, in which case the | |
381 | * state struct is freed. | |
382 | * | |
383 | * The tree lock is not taken internally. This is a utility function and | |
384 | * probably isn't what you want to call (see set/clear_extent_bit). | |
385 | */ | |
386 | static int insert_state(struct extent_io_tree *tree, | |
387 | struct extent_state *state, u64 start, u64 end, | |
41074888 | 388 | unsigned long *bits) |
d1310b2e CM |
389 | { |
390 | struct rb_node *node; | |
391 | ||
31b1a2bd JL |
392 | if (end < start) |
393 | WARN(1, KERN_ERR "btrfs end < start %llu %llu\n", | |
c1c9ff7c | 394 | end, start); |
d1310b2e CM |
395 | state->start = start; |
396 | state->end = end; | |
9ed74f2d | 397 | |
3150b699 XG |
398 | set_state_bits(tree, state, bits); |
399 | ||
d1310b2e CM |
400 | node = tree_insert(&tree->state, end, &state->rb_node); |
401 | if (node) { | |
402 | struct extent_state *found; | |
403 | found = rb_entry(node, struct extent_state, rb_node); | |
d397712b | 404 | printk(KERN_ERR "btrfs found node %llu %llu on insert of " |
c1c9ff7c GU |
405 | "%llu %llu\n", |
406 | found->start, found->end, start, end); | |
d1310b2e CM |
407 | return -EEXIST; |
408 | } | |
70dec807 | 409 | state->tree = tree; |
d1310b2e CM |
410 | merge_state(tree, state); |
411 | return 0; | |
412 | } | |
413 | ||
1bf85046 | 414 | static void split_cb(struct extent_io_tree *tree, struct extent_state *orig, |
9ed74f2d JB |
415 | u64 split) |
416 | { | |
417 | if (tree->ops && tree->ops->split_extent_hook) | |
1bf85046 | 418 | tree->ops->split_extent_hook(tree->mapping->host, orig, split); |
9ed74f2d JB |
419 | } |
420 | ||
d1310b2e CM |
421 | /* |
422 | * split a given extent state struct in two, inserting the preallocated | |
423 | * struct 'prealloc' as the newly created second half. 'split' indicates an | |
424 | * offset inside 'orig' where it should be split. | |
425 | * | |
426 | * Before calling, | |
427 | * the tree has 'orig' at [orig->start, orig->end]. After calling, there | |
428 | * are two extent state structs in the tree: | |
429 | * prealloc: [orig->start, split - 1] | |
430 | * orig: [ split, orig->end ] | |
431 | * | |
432 | * The tree locks are not taken by this function. They need to be held | |
433 | * by the caller. | |
434 | */ | |
435 | static int split_state(struct extent_io_tree *tree, struct extent_state *orig, | |
436 | struct extent_state *prealloc, u64 split) | |
437 | { | |
438 | struct rb_node *node; | |
9ed74f2d JB |
439 | |
440 | split_cb(tree, orig, split); | |
441 | ||
d1310b2e CM |
442 | prealloc->start = orig->start; |
443 | prealloc->end = split - 1; | |
444 | prealloc->state = orig->state; | |
445 | orig->start = split; | |
446 | ||
447 | node = tree_insert(&tree->state, prealloc->end, &prealloc->rb_node); | |
448 | if (node) { | |
d1310b2e CM |
449 | free_extent_state(prealloc); |
450 | return -EEXIST; | |
451 | } | |
70dec807 | 452 | prealloc->tree = tree; |
d1310b2e CM |
453 | return 0; |
454 | } | |
455 | ||
cdc6a395 LZ |
456 | static struct extent_state *next_state(struct extent_state *state) |
457 | { | |
458 | struct rb_node *next = rb_next(&state->rb_node); | |
459 | if (next) | |
460 | return rb_entry(next, struct extent_state, rb_node); | |
461 | else | |
462 | return NULL; | |
463 | } | |
464 | ||
d1310b2e CM |
465 | /* |
466 | * utility function to clear some bits in an extent state struct. | |
1b303fc0 | 467 | * it will optionally wake up any one waiting on this state (wake == 1). |
d1310b2e CM |
468 | * |
469 | * If no bits are set on the state struct after clearing things, the | |
470 | * struct is freed and removed from the tree | |
471 | */ | |
cdc6a395 LZ |
472 | static struct extent_state *clear_state_bit(struct extent_io_tree *tree, |
473 | struct extent_state *state, | |
41074888 | 474 | unsigned long *bits, int wake) |
d1310b2e | 475 | { |
cdc6a395 | 476 | struct extent_state *next; |
41074888 | 477 | unsigned long bits_to_clear = *bits & ~EXTENT_CTLBITS; |
d1310b2e | 478 | |
0ca1f7ce | 479 | if ((bits_to_clear & EXTENT_DIRTY) && (state->state & EXTENT_DIRTY)) { |
d1310b2e CM |
480 | u64 range = state->end - state->start + 1; |
481 | WARN_ON(range > tree->dirty_bytes); | |
482 | tree->dirty_bytes -= range; | |
483 | } | |
291d673e | 484 | clear_state_cb(tree, state, bits); |
32c00aff | 485 | state->state &= ~bits_to_clear; |
d1310b2e CM |
486 | if (wake) |
487 | wake_up(&state->wq); | |
0ca1f7ce | 488 | if (state->state == 0) { |
cdc6a395 | 489 | next = next_state(state); |
70dec807 | 490 | if (state->tree) { |
d1310b2e | 491 | rb_erase(&state->rb_node, &tree->state); |
70dec807 | 492 | state->tree = NULL; |
d1310b2e CM |
493 | free_extent_state(state); |
494 | } else { | |
495 | WARN_ON(1); | |
496 | } | |
497 | } else { | |
498 | merge_state(tree, state); | |
cdc6a395 | 499 | next = next_state(state); |
d1310b2e | 500 | } |
cdc6a395 | 501 | return next; |
d1310b2e CM |
502 | } |
503 | ||
8233767a XG |
504 | static struct extent_state * |
505 | alloc_extent_state_atomic(struct extent_state *prealloc) | |
506 | { | |
507 | if (!prealloc) | |
508 | prealloc = alloc_extent_state(GFP_ATOMIC); | |
509 | ||
510 | return prealloc; | |
511 | } | |
512 | ||
48a3b636 | 513 | static void extent_io_tree_panic(struct extent_io_tree *tree, int err) |
c2d904e0 JM |
514 | { |
515 | btrfs_panic(tree_fs_info(tree), err, "Locking error: " | |
516 | "Extent tree was modified by another " | |
517 | "thread while locked."); | |
518 | } | |
519 | ||
d1310b2e CM |
520 | /* |
521 | * clear some bits on a range in the tree. This may require splitting | |
522 | * or inserting elements in the tree, so the gfp mask is used to | |
523 | * indicate which allocations or sleeping are allowed. | |
524 | * | |
525 | * pass 'wake' == 1 to kick any sleepers, and 'delete' == 1 to remove | |
526 | * the given range from the tree regardless of state (ie for truncate). | |
527 | * | |
528 | * the range [start, end] is inclusive. | |
529 | * | |
6763af84 | 530 | * This takes the tree lock, and returns 0 on success and < 0 on error. |
d1310b2e CM |
531 | */ |
532 | int clear_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, | |
41074888 | 533 | unsigned long bits, int wake, int delete, |
2c64c53d CM |
534 | struct extent_state **cached_state, |
535 | gfp_t mask) | |
d1310b2e CM |
536 | { |
537 | struct extent_state *state; | |
2c64c53d | 538 | struct extent_state *cached; |
d1310b2e CM |
539 | struct extent_state *prealloc = NULL; |
540 | struct rb_node *node; | |
5c939df5 | 541 | u64 last_end; |
d1310b2e | 542 | int err; |
2ac55d41 | 543 | int clear = 0; |
d1310b2e | 544 | |
8d599ae1 DS |
545 | btrfs_debug_check_extent_io_range(tree->mapping->host, start, end); |
546 | ||
7ee9e440 JB |
547 | if (bits & EXTENT_DELALLOC) |
548 | bits |= EXTENT_NORESERVE; | |
549 | ||
0ca1f7ce YZ |
550 | if (delete) |
551 | bits |= ~EXTENT_CTLBITS; | |
552 | bits |= EXTENT_FIRST_DELALLOC; | |
553 | ||
2ac55d41 JB |
554 | if (bits & (EXTENT_IOBITS | EXTENT_BOUNDARY)) |
555 | clear = 1; | |
d1310b2e CM |
556 | again: |
557 | if (!prealloc && (mask & __GFP_WAIT)) { | |
558 | prealloc = alloc_extent_state(mask); | |
559 | if (!prealloc) | |
560 | return -ENOMEM; | |
561 | } | |
562 | ||
cad321ad | 563 | spin_lock(&tree->lock); |
2c64c53d CM |
564 | if (cached_state) { |
565 | cached = *cached_state; | |
2ac55d41 JB |
566 | |
567 | if (clear) { | |
568 | *cached_state = NULL; | |
569 | cached_state = NULL; | |
570 | } | |
571 | ||
df98b6e2 JB |
572 | if (cached && cached->tree && cached->start <= start && |
573 | cached->end > start) { | |
2ac55d41 JB |
574 | if (clear) |
575 | atomic_dec(&cached->refs); | |
2c64c53d | 576 | state = cached; |
42daec29 | 577 | goto hit_next; |
2c64c53d | 578 | } |
2ac55d41 JB |
579 | if (clear) |
580 | free_extent_state(cached); | |
2c64c53d | 581 | } |
d1310b2e CM |
582 | /* |
583 | * this search will find the extents that end after | |
584 | * our range starts | |
585 | */ | |
80ea96b1 | 586 | node = tree_search(tree, start); |
d1310b2e CM |
587 | if (!node) |
588 | goto out; | |
589 | state = rb_entry(node, struct extent_state, rb_node); | |
2c64c53d | 590 | hit_next: |
d1310b2e CM |
591 | if (state->start > end) |
592 | goto out; | |
593 | WARN_ON(state->end < start); | |
5c939df5 | 594 | last_end = state->end; |
d1310b2e | 595 | |
0449314a | 596 | /* the state doesn't have the wanted bits, go ahead */ |
cdc6a395 LZ |
597 | if (!(state->state & bits)) { |
598 | state = next_state(state); | |
0449314a | 599 | goto next; |
cdc6a395 | 600 | } |
0449314a | 601 | |
d1310b2e CM |
602 | /* |
603 | * | ---- desired range ---- | | |
604 | * | state | or | |
605 | * | ------------- state -------------- | | |
606 | * | |
607 | * We need to split the extent we found, and may flip | |
608 | * bits on second half. | |
609 | * | |
610 | * If the extent we found extends past our range, we | |
611 | * just split and search again. It'll get split again | |
612 | * the next time though. | |
613 | * | |
614 | * If the extent we found is inside our range, we clear | |
615 | * the desired bit on it. | |
616 | */ | |
617 | ||
618 | if (state->start < start) { | |
8233767a XG |
619 | prealloc = alloc_extent_state_atomic(prealloc); |
620 | BUG_ON(!prealloc); | |
d1310b2e | 621 | err = split_state(tree, state, prealloc, start); |
c2d904e0 JM |
622 | if (err) |
623 | extent_io_tree_panic(tree, err); | |
624 | ||
d1310b2e CM |
625 | prealloc = NULL; |
626 | if (err) | |
627 | goto out; | |
628 | if (state->end <= end) { | |
d1ac6e41 LB |
629 | state = clear_state_bit(tree, state, &bits, wake); |
630 | goto next; | |
d1310b2e CM |
631 | } |
632 | goto search_again; | |
633 | } | |
634 | /* | |
635 | * | ---- desired range ---- | | |
636 | * | state | | |
637 | * We need to split the extent, and clear the bit | |
638 | * on the first half | |
639 | */ | |
640 | if (state->start <= end && state->end > end) { | |
8233767a XG |
641 | prealloc = alloc_extent_state_atomic(prealloc); |
642 | BUG_ON(!prealloc); | |
d1310b2e | 643 | err = split_state(tree, state, prealloc, end + 1); |
c2d904e0 JM |
644 | if (err) |
645 | extent_io_tree_panic(tree, err); | |
646 | ||
d1310b2e CM |
647 | if (wake) |
648 | wake_up(&state->wq); | |
42daec29 | 649 | |
6763af84 | 650 | clear_state_bit(tree, prealloc, &bits, wake); |
9ed74f2d | 651 | |
d1310b2e CM |
652 | prealloc = NULL; |
653 | goto out; | |
654 | } | |
42daec29 | 655 | |
cdc6a395 | 656 | state = clear_state_bit(tree, state, &bits, wake); |
0449314a | 657 | next: |
5c939df5 YZ |
658 | if (last_end == (u64)-1) |
659 | goto out; | |
660 | start = last_end + 1; | |
cdc6a395 | 661 | if (start <= end && state && !need_resched()) |
692e5759 | 662 | goto hit_next; |
d1310b2e CM |
663 | goto search_again; |
664 | ||
665 | out: | |
cad321ad | 666 | spin_unlock(&tree->lock); |
d1310b2e CM |
667 | if (prealloc) |
668 | free_extent_state(prealloc); | |
669 | ||
6763af84 | 670 | return 0; |
d1310b2e CM |
671 | |
672 | search_again: | |
673 | if (start > end) | |
674 | goto out; | |
cad321ad | 675 | spin_unlock(&tree->lock); |
d1310b2e CM |
676 | if (mask & __GFP_WAIT) |
677 | cond_resched(); | |
678 | goto again; | |
679 | } | |
d1310b2e | 680 | |
143bede5 JM |
681 | static void wait_on_state(struct extent_io_tree *tree, |
682 | struct extent_state *state) | |
641f5219 CH |
683 | __releases(tree->lock) |
684 | __acquires(tree->lock) | |
d1310b2e CM |
685 | { |
686 | DEFINE_WAIT(wait); | |
687 | prepare_to_wait(&state->wq, &wait, TASK_UNINTERRUPTIBLE); | |
cad321ad | 688 | spin_unlock(&tree->lock); |
d1310b2e | 689 | schedule(); |
cad321ad | 690 | spin_lock(&tree->lock); |
d1310b2e | 691 | finish_wait(&state->wq, &wait); |
d1310b2e CM |
692 | } |
693 | ||
694 | /* | |
695 | * waits for one or more bits to clear on a range in the state tree. | |
696 | * The range [start, end] is inclusive. | |
697 | * The tree lock is taken by this function | |
698 | */ | |
41074888 DS |
699 | static void wait_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, |
700 | unsigned long bits) | |
d1310b2e CM |
701 | { |
702 | struct extent_state *state; | |
703 | struct rb_node *node; | |
704 | ||
8d599ae1 DS |
705 | btrfs_debug_check_extent_io_range(tree->mapping->host, start, end); |
706 | ||
cad321ad | 707 | spin_lock(&tree->lock); |
d1310b2e CM |
708 | again: |
709 | while (1) { | |
710 | /* | |
711 | * this search will find all the extents that end after | |
712 | * our range starts | |
713 | */ | |
80ea96b1 | 714 | node = tree_search(tree, start); |
d1310b2e CM |
715 | if (!node) |
716 | break; | |
717 | ||
718 | state = rb_entry(node, struct extent_state, rb_node); | |
719 | ||
720 | if (state->start > end) | |
721 | goto out; | |
722 | ||
723 | if (state->state & bits) { | |
724 | start = state->start; | |
725 | atomic_inc(&state->refs); | |
726 | wait_on_state(tree, state); | |
727 | free_extent_state(state); | |
728 | goto again; | |
729 | } | |
730 | start = state->end + 1; | |
731 | ||
732 | if (start > end) | |
733 | break; | |
734 | ||
ded91f08 | 735 | cond_resched_lock(&tree->lock); |
d1310b2e CM |
736 | } |
737 | out: | |
cad321ad | 738 | spin_unlock(&tree->lock); |
d1310b2e | 739 | } |
d1310b2e | 740 | |
1bf85046 | 741 | static void set_state_bits(struct extent_io_tree *tree, |
d1310b2e | 742 | struct extent_state *state, |
41074888 | 743 | unsigned long *bits) |
d1310b2e | 744 | { |
41074888 | 745 | unsigned long bits_to_set = *bits & ~EXTENT_CTLBITS; |
9ed74f2d | 746 | |
1bf85046 | 747 | set_state_cb(tree, state, bits); |
0ca1f7ce | 748 | if ((bits_to_set & EXTENT_DIRTY) && !(state->state & EXTENT_DIRTY)) { |
d1310b2e CM |
749 | u64 range = state->end - state->start + 1; |
750 | tree->dirty_bytes += range; | |
751 | } | |
0ca1f7ce | 752 | state->state |= bits_to_set; |
d1310b2e CM |
753 | } |
754 | ||
2c64c53d CM |
755 | static void cache_state(struct extent_state *state, |
756 | struct extent_state **cached_ptr) | |
757 | { | |
758 | if (cached_ptr && !(*cached_ptr)) { | |
759 | if (state->state & (EXTENT_IOBITS | EXTENT_BOUNDARY)) { | |
760 | *cached_ptr = state; | |
761 | atomic_inc(&state->refs); | |
762 | } | |
763 | } | |
764 | } | |
765 | ||
d1310b2e | 766 | /* |
1edbb734 CM |
767 | * set some bits on a range in the tree. This may require allocations or |
768 | * sleeping, so the gfp mask is used to indicate what is allowed. | |
d1310b2e | 769 | * |
1edbb734 CM |
770 | * If any of the exclusive bits are set, this will fail with -EEXIST if some |
771 | * part of the range already has the desired bits set. The start of the | |
772 | * existing range is returned in failed_start in this case. | |
d1310b2e | 773 | * |
1edbb734 | 774 | * [start, end] is inclusive This takes the tree lock. |
d1310b2e | 775 | */ |
1edbb734 | 776 | |
3fbe5c02 JM |
777 | static int __must_check |
778 | __set_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, | |
41074888 DS |
779 | unsigned long bits, unsigned long exclusive_bits, |
780 | u64 *failed_start, struct extent_state **cached_state, | |
781 | gfp_t mask) | |
d1310b2e CM |
782 | { |
783 | struct extent_state *state; | |
784 | struct extent_state *prealloc = NULL; | |
785 | struct rb_node *node; | |
d1310b2e | 786 | int err = 0; |
d1310b2e CM |
787 | u64 last_start; |
788 | u64 last_end; | |
42daec29 | 789 | |
8d599ae1 DS |
790 | btrfs_debug_check_extent_io_range(tree->mapping->host, start, end); |
791 | ||
0ca1f7ce | 792 | bits |= EXTENT_FIRST_DELALLOC; |
d1310b2e CM |
793 | again: |
794 | if (!prealloc && (mask & __GFP_WAIT)) { | |
795 | prealloc = alloc_extent_state(mask); | |
8233767a | 796 | BUG_ON(!prealloc); |
d1310b2e CM |
797 | } |
798 | ||
cad321ad | 799 | spin_lock(&tree->lock); |
9655d298 CM |
800 | if (cached_state && *cached_state) { |
801 | state = *cached_state; | |
df98b6e2 JB |
802 | if (state->start <= start && state->end > start && |
803 | state->tree) { | |
9655d298 CM |
804 | node = &state->rb_node; |
805 | goto hit_next; | |
806 | } | |
807 | } | |
d1310b2e CM |
808 | /* |
809 | * this search will find all the extents that end after | |
810 | * our range starts. | |
811 | */ | |
80ea96b1 | 812 | node = tree_search(tree, start); |
d1310b2e | 813 | if (!node) { |
8233767a XG |
814 | prealloc = alloc_extent_state_atomic(prealloc); |
815 | BUG_ON(!prealloc); | |
0ca1f7ce | 816 | err = insert_state(tree, prealloc, start, end, &bits); |
c2d904e0 JM |
817 | if (err) |
818 | extent_io_tree_panic(tree, err); | |
819 | ||
d1310b2e | 820 | prealloc = NULL; |
d1310b2e CM |
821 | goto out; |
822 | } | |
d1310b2e | 823 | state = rb_entry(node, struct extent_state, rb_node); |
40431d6c | 824 | hit_next: |
d1310b2e CM |
825 | last_start = state->start; |
826 | last_end = state->end; | |
827 | ||
828 | /* | |
829 | * | ---- desired range ---- | | |
830 | * | state | | |
831 | * | |
832 | * Just lock what we found and keep going | |
833 | */ | |
834 | if (state->start == start && state->end <= end) { | |
1edbb734 | 835 | if (state->state & exclusive_bits) { |
d1310b2e CM |
836 | *failed_start = state->start; |
837 | err = -EEXIST; | |
838 | goto out; | |
839 | } | |
42daec29 | 840 | |
1bf85046 | 841 | set_state_bits(tree, state, &bits); |
2c64c53d | 842 | cache_state(state, cached_state); |
d1310b2e | 843 | merge_state(tree, state); |
5c939df5 YZ |
844 | if (last_end == (u64)-1) |
845 | goto out; | |
846 | start = last_end + 1; | |
d1ac6e41 LB |
847 | state = next_state(state); |
848 | if (start < end && state && state->start == start && | |
849 | !need_resched()) | |
850 | goto hit_next; | |
d1310b2e CM |
851 | goto search_again; |
852 | } | |
853 | ||
854 | /* | |
855 | * | ---- desired range ---- | | |
856 | * | state | | |
857 | * or | |
858 | * | ------------- state -------------- | | |
859 | * | |
860 | * We need to split the extent we found, and may flip bits on | |
861 | * second half. | |
862 | * | |
863 | * If the extent we found extends past our | |
864 | * range, we just split and search again. It'll get split | |
865 | * again the next time though. | |
866 | * | |
867 | * If the extent we found is inside our range, we set the | |
868 | * desired bit on it. | |
869 | */ | |
870 | if (state->start < start) { | |
1edbb734 | 871 | if (state->state & exclusive_bits) { |
d1310b2e CM |
872 | *failed_start = start; |
873 | err = -EEXIST; | |
874 | goto out; | |
875 | } | |
8233767a XG |
876 | |
877 | prealloc = alloc_extent_state_atomic(prealloc); | |
878 | BUG_ON(!prealloc); | |
d1310b2e | 879 | err = split_state(tree, state, prealloc, start); |
c2d904e0 JM |
880 | if (err) |
881 | extent_io_tree_panic(tree, err); | |
882 | ||
d1310b2e CM |
883 | prealloc = NULL; |
884 | if (err) | |
885 | goto out; | |
886 | if (state->end <= end) { | |
1bf85046 | 887 | set_state_bits(tree, state, &bits); |
2c64c53d | 888 | cache_state(state, cached_state); |
d1310b2e | 889 | merge_state(tree, state); |
5c939df5 YZ |
890 | if (last_end == (u64)-1) |
891 | goto out; | |
892 | start = last_end + 1; | |
d1ac6e41 LB |
893 | state = next_state(state); |
894 | if (start < end && state && state->start == start && | |
895 | !need_resched()) | |
896 | goto hit_next; | |
d1310b2e CM |
897 | } |
898 | goto search_again; | |
899 | } | |
900 | /* | |
901 | * | ---- desired range ---- | | |
902 | * | state | or | state | | |
903 | * | |
904 | * There's a hole, we need to insert something in it and | |
905 | * ignore the extent we found. | |
906 | */ | |
907 | if (state->start > start) { | |
908 | u64 this_end; | |
909 | if (end < last_start) | |
910 | this_end = end; | |
911 | else | |
d397712b | 912 | this_end = last_start - 1; |
8233767a XG |
913 | |
914 | prealloc = alloc_extent_state_atomic(prealloc); | |
915 | BUG_ON(!prealloc); | |
c7f895a2 XG |
916 | |
917 | /* | |
918 | * Avoid to free 'prealloc' if it can be merged with | |
919 | * the later extent. | |
920 | */ | |
d1310b2e | 921 | err = insert_state(tree, prealloc, start, this_end, |
0ca1f7ce | 922 | &bits); |
c2d904e0 JM |
923 | if (err) |
924 | extent_io_tree_panic(tree, err); | |
925 | ||
9ed74f2d JB |
926 | cache_state(prealloc, cached_state); |
927 | prealloc = NULL; | |
d1310b2e CM |
928 | start = this_end + 1; |
929 | goto search_again; | |
930 | } | |
931 | /* | |
932 | * | ---- desired range ---- | | |
933 | * | state | | |
934 | * We need to split the extent, and set the bit | |
935 | * on the first half | |
936 | */ | |
937 | if (state->start <= end && state->end > end) { | |
1edbb734 | 938 | if (state->state & exclusive_bits) { |
d1310b2e CM |
939 | *failed_start = start; |
940 | err = -EEXIST; | |
941 | goto out; | |
942 | } | |
8233767a XG |
943 | |
944 | prealloc = alloc_extent_state_atomic(prealloc); | |
945 | BUG_ON(!prealloc); | |
d1310b2e | 946 | err = split_state(tree, state, prealloc, end + 1); |
c2d904e0 JM |
947 | if (err) |
948 | extent_io_tree_panic(tree, err); | |
d1310b2e | 949 | |
1bf85046 | 950 | set_state_bits(tree, prealloc, &bits); |
2c64c53d | 951 | cache_state(prealloc, cached_state); |
d1310b2e CM |
952 | merge_state(tree, prealloc); |
953 | prealloc = NULL; | |
954 | goto out; | |
955 | } | |
956 | ||
957 | goto search_again; | |
958 | ||
959 | out: | |
cad321ad | 960 | spin_unlock(&tree->lock); |
d1310b2e CM |
961 | if (prealloc) |
962 | free_extent_state(prealloc); | |
963 | ||
964 | return err; | |
965 | ||
966 | search_again: | |
967 | if (start > end) | |
968 | goto out; | |
cad321ad | 969 | spin_unlock(&tree->lock); |
d1310b2e CM |
970 | if (mask & __GFP_WAIT) |
971 | cond_resched(); | |
972 | goto again; | |
973 | } | |
d1310b2e | 974 | |
41074888 DS |
975 | int set_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, |
976 | unsigned long bits, u64 * failed_start, | |
977 | struct extent_state **cached_state, gfp_t mask) | |
3fbe5c02 JM |
978 | { |
979 | return __set_extent_bit(tree, start, end, bits, 0, failed_start, | |
980 | cached_state, mask); | |
981 | } | |
982 | ||
983 | ||
462d6fac | 984 | /** |
10983f2e LB |
985 | * convert_extent_bit - convert all bits in a given range from one bit to |
986 | * another | |
462d6fac JB |
987 | * @tree: the io tree to search |
988 | * @start: the start offset in bytes | |
989 | * @end: the end offset in bytes (inclusive) | |
990 | * @bits: the bits to set in this range | |
991 | * @clear_bits: the bits to clear in this range | |
e6138876 | 992 | * @cached_state: state that we're going to cache |
462d6fac JB |
993 | * @mask: the allocation mask |
994 | * | |
995 | * This will go through and set bits for the given range. If any states exist | |
996 | * already in this range they are set with the given bit and cleared of the | |
997 | * clear_bits. This is only meant to be used by things that are mergeable, ie | |
998 | * converting from say DELALLOC to DIRTY. This is not meant to be used with | |
999 | * boundary bits like LOCK. | |
1000 | */ | |
1001 | int convert_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, | |
41074888 | 1002 | unsigned long bits, unsigned long clear_bits, |
e6138876 | 1003 | struct extent_state **cached_state, gfp_t mask) |
462d6fac JB |
1004 | { |
1005 | struct extent_state *state; | |
1006 | struct extent_state *prealloc = NULL; | |
1007 | struct rb_node *node; | |
1008 | int err = 0; | |
1009 | u64 last_start; | |
1010 | u64 last_end; | |
1011 | ||
8d599ae1 DS |
1012 | btrfs_debug_check_extent_io_range(tree->mapping->host, start, end); |
1013 | ||
462d6fac JB |
1014 | again: |
1015 | if (!prealloc && (mask & __GFP_WAIT)) { | |
1016 | prealloc = alloc_extent_state(mask); | |
1017 | if (!prealloc) | |
1018 | return -ENOMEM; | |
1019 | } | |
1020 | ||
1021 | spin_lock(&tree->lock); | |
e6138876 JB |
1022 | if (cached_state && *cached_state) { |
1023 | state = *cached_state; | |
1024 | if (state->start <= start && state->end > start && | |
1025 | state->tree) { | |
1026 | node = &state->rb_node; | |
1027 | goto hit_next; | |
1028 | } | |
1029 | } | |
1030 | ||
462d6fac JB |
1031 | /* |
1032 | * this search will find all the extents that end after | |
1033 | * our range starts. | |
1034 | */ | |
1035 | node = tree_search(tree, start); | |
1036 | if (!node) { | |
1037 | prealloc = alloc_extent_state_atomic(prealloc); | |
1cf4ffdb LB |
1038 | if (!prealloc) { |
1039 | err = -ENOMEM; | |
1040 | goto out; | |
1041 | } | |
462d6fac JB |
1042 | err = insert_state(tree, prealloc, start, end, &bits); |
1043 | prealloc = NULL; | |
c2d904e0 JM |
1044 | if (err) |
1045 | extent_io_tree_panic(tree, err); | |
462d6fac JB |
1046 | goto out; |
1047 | } | |
1048 | state = rb_entry(node, struct extent_state, rb_node); | |
1049 | hit_next: | |
1050 | last_start = state->start; | |
1051 | last_end = state->end; | |
1052 | ||
1053 | /* | |
1054 | * | ---- desired range ---- | | |
1055 | * | state | | |
1056 | * | |
1057 | * Just lock what we found and keep going | |
1058 | */ | |
1059 | if (state->start == start && state->end <= end) { | |
462d6fac | 1060 | set_state_bits(tree, state, &bits); |
e6138876 | 1061 | cache_state(state, cached_state); |
d1ac6e41 | 1062 | state = clear_state_bit(tree, state, &clear_bits, 0); |
462d6fac JB |
1063 | if (last_end == (u64)-1) |
1064 | goto out; | |
462d6fac | 1065 | start = last_end + 1; |
d1ac6e41 LB |
1066 | if (start < end && state && state->start == start && |
1067 | !need_resched()) | |
1068 | goto hit_next; | |
462d6fac JB |
1069 | goto search_again; |
1070 | } | |
1071 | ||
1072 | /* | |
1073 | * | ---- desired range ---- | | |
1074 | * | state | | |
1075 | * or | |
1076 | * | ------------- state -------------- | | |
1077 | * | |
1078 | * We need to split the extent we found, and may flip bits on | |
1079 | * second half. | |
1080 | * | |
1081 | * If the extent we found extends past our | |
1082 | * range, we just split and search again. It'll get split | |
1083 | * again the next time though. | |
1084 | * | |
1085 | * If the extent we found is inside our range, we set the | |
1086 | * desired bit on it. | |
1087 | */ | |
1088 | if (state->start < start) { | |
1089 | prealloc = alloc_extent_state_atomic(prealloc); | |
1cf4ffdb LB |
1090 | if (!prealloc) { |
1091 | err = -ENOMEM; | |
1092 | goto out; | |
1093 | } | |
462d6fac | 1094 | err = split_state(tree, state, prealloc, start); |
c2d904e0 JM |
1095 | if (err) |
1096 | extent_io_tree_panic(tree, err); | |
462d6fac JB |
1097 | prealloc = NULL; |
1098 | if (err) | |
1099 | goto out; | |
1100 | if (state->end <= end) { | |
1101 | set_state_bits(tree, state, &bits); | |
e6138876 | 1102 | cache_state(state, cached_state); |
d1ac6e41 | 1103 | state = clear_state_bit(tree, state, &clear_bits, 0); |
462d6fac JB |
1104 | if (last_end == (u64)-1) |
1105 | goto out; | |
1106 | start = last_end + 1; | |
d1ac6e41 LB |
1107 | if (start < end && state && state->start == start && |
1108 | !need_resched()) | |
1109 | goto hit_next; | |
462d6fac JB |
1110 | } |
1111 | goto search_again; | |
1112 | } | |
1113 | /* | |
1114 | * | ---- desired range ---- | | |
1115 | * | state | or | state | | |
1116 | * | |
1117 | * There's a hole, we need to insert something in it and | |
1118 | * ignore the extent we found. | |
1119 | */ | |
1120 | if (state->start > start) { | |
1121 | u64 this_end; | |
1122 | if (end < last_start) | |
1123 | this_end = end; | |
1124 | else | |
1125 | this_end = last_start - 1; | |
1126 | ||
1127 | prealloc = alloc_extent_state_atomic(prealloc); | |
1cf4ffdb LB |
1128 | if (!prealloc) { |
1129 | err = -ENOMEM; | |
1130 | goto out; | |
1131 | } | |
462d6fac JB |
1132 | |
1133 | /* | |
1134 | * Avoid to free 'prealloc' if it can be merged with | |
1135 | * the later extent. | |
1136 | */ | |
1137 | err = insert_state(tree, prealloc, start, this_end, | |
1138 | &bits); | |
c2d904e0 JM |
1139 | if (err) |
1140 | extent_io_tree_panic(tree, err); | |
e6138876 | 1141 | cache_state(prealloc, cached_state); |
462d6fac JB |
1142 | prealloc = NULL; |
1143 | start = this_end + 1; | |
1144 | goto search_again; | |
1145 | } | |
1146 | /* | |
1147 | * | ---- desired range ---- | | |
1148 | * | state | | |
1149 | * We need to split the extent, and set the bit | |
1150 | * on the first half | |
1151 | */ | |
1152 | if (state->start <= end && state->end > end) { | |
1153 | prealloc = alloc_extent_state_atomic(prealloc); | |
1cf4ffdb LB |
1154 | if (!prealloc) { |
1155 | err = -ENOMEM; | |
1156 | goto out; | |
1157 | } | |
462d6fac JB |
1158 | |
1159 | err = split_state(tree, state, prealloc, end + 1); | |
c2d904e0 JM |
1160 | if (err) |
1161 | extent_io_tree_panic(tree, err); | |
462d6fac JB |
1162 | |
1163 | set_state_bits(tree, prealloc, &bits); | |
e6138876 | 1164 | cache_state(prealloc, cached_state); |
462d6fac | 1165 | clear_state_bit(tree, prealloc, &clear_bits, 0); |
462d6fac JB |
1166 | prealloc = NULL; |
1167 | goto out; | |
1168 | } | |
1169 | ||
1170 | goto search_again; | |
1171 | ||
1172 | out: | |
1173 | spin_unlock(&tree->lock); | |
1174 | if (prealloc) | |
1175 | free_extent_state(prealloc); | |
1176 | ||
1177 | return err; | |
1178 | ||
1179 | search_again: | |
1180 | if (start > end) | |
1181 | goto out; | |
1182 | spin_unlock(&tree->lock); | |
1183 | if (mask & __GFP_WAIT) | |
1184 | cond_resched(); | |
1185 | goto again; | |
1186 | } | |
1187 | ||
d1310b2e CM |
1188 | /* wrappers around set/clear extent bit */ |
1189 | int set_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end, | |
1190 | gfp_t mask) | |
1191 | { | |
3fbe5c02 | 1192 | return set_extent_bit(tree, start, end, EXTENT_DIRTY, NULL, |
2c64c53d | 1193 | NULL, mask); |
d1310b2e | 1194 | } |
d1310b2e CM |
1195 | |
1196 | int set_extent_bits(struct extent_io_tree *tree, u64 start, u64 end, | |
41074888 | 1197 | unsigned long bits, gfp_t mask) |
d1310b2e | 1198 | { |
3fbe5c02 | 1199 | return set_extent_bit(tree, start, end, bits, NULL, |
2c64c53d | 1200 | NULL, mask); |
d1310b2e | 1201 | } |
d1310b2e CM |
1202 | |
1203 | int clear_extent_bits(struct extent_io_tree *tree, u64 start, u64 end, | |
41074888 | 1204 | unsigned long bits, gfp_t mask) |
d1310b2e | 1205 | { |
2c64c53d | 1206 | return clear_extent_bit(tree, start, end, bits, 0, 0, NULL, mask); |
d1310b2e | 1207 | } |
d1310b2e CM |
1208 | |
1209 | int set_extent_delalloc(struct extent_io_tree *tree, u64 start, u64 end, | |
2ac55d41 | 1210 | struct extent_state **cached_state, gfp_t mask) |
d1310b2e CM |
1211 | { |
1212 | return set_extent_bit(tree, start, end, | |
fee187d9 | 1213 | EXTENT_DELALLOC | EXTENT_UPTODATE, |
3fbe5c02 | 1214 | NULL, cached_state, mask); |
d1310b2e | 1215 | } |
d1310b2e | 1216 | |
9e8a4a8b LB |
1217 | int set_extent_defrag(struct extent_io_tree *tree, u64 start, u64 end, |
1218 | struct extent_state **cached_state, gfp_t mask) | |
1219 | { | |
1220 | return set_extent_bit(tree, start, end, | |
1221 | EXTENT_DELALLOC | EXTENT_UPTODATE | EXTENT_DEFRAG, | |
1222 | NULL, cached_state, mask); | |
1223 | } | |
1224 | ||
d1310b2e CM |
1225 | int clear_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end, |
1226 | gfp_t mask) | |
1227 | { | |
1228 | return clear_extent_bit(tree, start, end, | |
32c00aff | 1229 | EXTENT_DIRTY | EXTENT_DELALLOC | |
0ca1f7ce | 1230 | EXTENT_DO_ACCOUNTING, 0, 0, NULL, mask); |
d1310b2e | 1231 | } |
d1310b2e CM |
1232 | |
1233 | int set_extent_new(struct extent_io_tree *tree, u64 start, u64 end, | |
1234 | gfp_t mask) | |
1235 | { | |
3fbe5c02 | 1236 | return set_extent_bit(tree, start, end, EXTENT_NEW, NULL, |
2c64c53d | 1237 | NULL, mask); |
d1310b2e | 1238 | } |
d1310b2e | 1239 | |
d1310b2e | 1240 | int set_extent_uptodate(struct extent_io_tree *tree, u64 start, u64 end, |
507903b8 | 1241 | struct extent_state **cached_state, gfp_t mask) |
d1310b2e | 1242 | { |
6b67a320 | 1243 | return set_extent_bit(tree, start, end, EXTENT_UPTODATE, NULL, |
3fbe5c02 | 1244 | cached_state, mask); |
d1310b2e | 1245 | } |
d1310b2e | 1246 | |
5fd02043 JB |
1247 | int clear_extent_uptodate(struct extent_io_tree *tree, u64 start, u64 end, |
1248 | struct extent_state **cached_state, gfp_t mask) | |
d1310b2e | 1249 | { |
2c64c53d | 1250 | return clear_extent_bit(tree, start, end, EXTENT_UPTODATE, 0, 0, |
2ac55d41 | 1251 | cached_state, mask); |
d1310b2e | 1252 | } |
d1310b2e | 1253 | |
d352ac68 CM |
1254 | /* |
1255 | * either insert or lock state struct between start and end use mask to tell | |
1256 | * us if waiting is desired. | |
1257 | */ | |
1edbb734 | 1258 | int lock_extent_bits(struct extent_io_tree *tree, u64 start, u64 end, |
41074888 | 1259 | unsigned long bits, struct extent_state **cached_state) |
d1310b2e CM |
1260 | { |
1261 | int err; | |
1262 | u64 failed_start; | |
1263 | while (1) { | |
3fbe5c02 JM |
1264 | err = __set_extent_bit(tree, start, end, EXTENT_LOCKED | bits, |
1265 | EXTENT_LOCKED, &failed_start, | |
1266 | cached_state, GFP_NOFS); | |
d0082371 | 1267 | if (err == -EEXIST) { |
d1310b2e CM |
1268 | wait_extent_bit(tree, failed_start, end, EXTENT_LOCKED); |
1269 | start = failed_start; | |
d0082371 | 1270 | } else |
d1310b2e | 1271 | break; |
d1310b2e CM |
1272 | WARN_ON(start > end); |
1273 | } | |
1274 | return err; | |
1275 | } | |
d1310b2e | 1276 | |
d0082371 | 1277 | int lock_extent(struct extent_io_tree *tree, u64 start, u64 end) |
1edbb734 | 1278 | { |
d0082371 | 1279 | return lock_extent_bits(tree, start, end, 0, NULL); |
1edbb734 CM |
1280 | } |
1281 | ||
d0082371 | 1282 | int try_lock_extent(struct extent_io_tree *tree, u64 start, u64 end) |
25179201 JB |
1283 | { |
1284 | int err; | |
1285 | u64 failed_start; | |
1286 | ||
3fbe5c02 JM |
1287 | err = __set_extent_bit(tree, start, end, EXTENT_LOCKED, EXTENT_LOCKED, |
1288 | &failed_start, NULL, GFP_NOFS); | |
6643558d YZ |
1289 | if (err == -EEXIST) { |
1290 | if (failed_start > start) | |
1291 | clear_extent_bit(tree, start, failed_start - 1, | |
d0082371 | 1292 | EXTENT_LOCKED, 1, 0, NULL, GFP_NOFS); |
25179201 | 1293 | return 0; |
6643558d | 1294 | } |
25179201 JB |
1295 | return 1; |
1296 | } | |
25179201 | 1297 | |
2c64c53d CM |
1298 | int unlock_extent_cached(struct extent_io_tree *tree, u64 start, u64 end, |
1299 | struct extent_state **cached, gfp_t mask) | |
1300 | { | |
1301 | return clear_extent_bit(tree, start, end, EXTENT_LOCKED, 1, 0, cached, | |
1302 | mask); | |
1303 | } | |
1304 | ||
d0082371 | 1305 | int unlock_extent(struct extent_io_tree *tree, u64 start, u64 end) |
d1310b2e | 1306 | { |
2c64c53d | 1307 | return clear_extent_bit(tree, start, end, EXTENT_LOCKED, 1, 0, NULL, |
d0082371 | 1308 | GFP_NOFS); |
d1310b2e | 1309 | } |
d1310b2e | 1310 | |
4adaa611 CM |
1311 | int extent_range_clear_dirty_for_io(struct inode *inode, u64 start, u64 end) |
1312 | { | |
1313 | unsigned long index = start >> PAGE_CACHE_SHIFT; | |
1314 | unsigned long end_index = end >> PAGE_CACHE_SHIFT; | |
1315 | struct page *page; | |
1316 | ||
1317 | while (index <= end_index) { | |
1318 | page = find_get_page(inode->i_mapping, index); | |
1319 | BUG_ON(!page); /* Pages should be in the extent_io_tree */ | |
1320 | clear_page_dirty_for_io(page); | |
1321 | page_cache_release(page); | |
1322 | index++; | |
1323 | } | |
1324 | return 0; | |
1325 | } | |
1326 | ||
1327 | int extent_range_redirty_for_io(struct inode *inode, u64 start, u64 end) | |
1328 | { | |
1329 | unsigned long index = start >> PAGE_CACHE_SHIFT; | |
1330 | unsigned long end_index = end >> PAGE_CACHE_SHIFT; | |
1331 | struct page *page; | |
1332 | ||
1333 | while (index <= end_index) { | |
1334 | page = find_get_page(inode->i_mapping, index); | |
1335 | BUG_ON(!page); /* Pages should be in the extent_io_tree */ | |
1336 | account_page_redirty(page); | |
1337 | __set_page_dirty_nobuffers(page); | |
1338 | page_cache_release(page); | |
1339 | index++; | |
1340 | } | |
1341 | return 0; | |
1342 | } | |
1343 | ||
d1310b2e CM |
1344 | /* |
1345 | * helper function to set both pages and extents in the tree writeback | |
1346 | */ | |
b2950863 | 1347 | static int set_range_writeback(struct extent_io_tree *tree, u64 start, u64 end) |
d1310b2e CM |
1348 | { |
1349 | unsigned long index = start >> PAGE_CACHE_SHIFT; | |
1350 | unsigned long end_index = end >> PAGE_CACHE_SHIFT; | |
1351 | struct page *page; | |
1352 | ||
1353 | while (index <= end_index) { | |
1354 | page = find_get_page(tree->mapping, index); | |
79787eaa | 1355 | BUG_ON(!page); /* Pages should be in the extent_io_tree */ |
d1310b2e CM |
1356 | set_page_writeback(page); |
1357 | page_cache_release(page); | |
1358 | index++; | |
1359 | } | |
d1310b2e CM |
1360 | return 0; |
1361 | } | |
d1310b2e | 1362 | |
d352ac68 CM |
1363 | /* find the first state struct with 'bits' set after 'start', and |
1364 | * return it. tree->lock must be held. NULL will returned if | |
1365 | * nothing was found after 'start' | |
1366 | */ | |
48a3b636 ES |
1367 | static struct extent_state * |
1368 | find_first_extent_bit_state(struct extent_io_tree *tree, | |
41074888 | 1369 | u64 start, unsigned long bits) |
d7fc640e CM |
1370 | { |
1371 | struct rb_node *node; | |
1372 | struct extent_state *state; | |
1373 | ||
1374 | /* | |
1375 | * this search will find all the extents that end after | |
1376 | * our range starts. | |
1377 | */ | |
1378 | node = tree_search(tree, start); | |
d397712b | 1379 | if (!node) |
d7fc640e | 1380 | goto out; |
d7fc640e | 1381 | |
d397712b | 1382 | while (1) { |
d7fc640e | 1383 | state = rb_entry(node, struct extent_state, rb_node); |
d397712b | 1384 | if (state->end >= start && (state->state & bits)) |
d7fc640e | 1385 | return state; |
d397712b | 1386 | |
d7fc640e CM |
1387 | node = rb_next(node); |
1388 | if (!node) | |
1389 | break; | |
1390 | } | |
1391 | out: | |
1392 | return NULL; | |
1393 | } | |
d7fc640e | 1394 | |
69261c4b XG |
1395 | /* |
1396 | * find the first offset in the io tree with 'bits' set. zero is | |
1397 | * returned if we find something, and *start_ret and *end_ret are | |
1398 | * set to reflect the state struct that was found. | |
1399 | * | |
477d7eaf | 1400 | * If nothing was found, 1 is returned. If found something, return 0. |
69261c4b XG |
1401 | */ |
1402 | int find_first_extent_bit(struct extent_io_tree *tree, u64 start, | |
41074888 | 1403 | u64 *start_ret, u64 *end_ret, unsigned long bits, |
e6138876 | 1404 | struct extent_state **cached_state) |
69261c4b XG |
1405 | { |
1406 | struct extent_state *state; | |
e6138876 | 1407 | struct rb_node *n; |
69261c4b XG |
1408 | int ret = 1; |
1409 | ||
1410 | spin_lock(&tree->lock); | |
e6138876 JB |
1411 | if (cached_state && *cached_state) { |
1412 | state = *cached_state; | |
1413 | if (state->end == start - 1 && state->tree) { | |
1414 | n = rb_next(&state->rb_node); | |
1415 | while (n) { | |
1416 | state = rb_entry(n, struct extent_state, | |
1417 | rb_node); | |
1418 | if (state->state & bits) | |
1419 | goto got_it; | |
1420 | n = rb_next(n); | |
1421 | } | |
1422 | free_extent_state(*cached_state); | |
1423 | *cached_state = NULL; | |
1424 | goto out; | |
1425 | } | |
1426 | free_extent_state(*cached_state); | |
1427 | *cached_state = NULL; | |
1428 | } | |
1429 | ||
69261c4b | 1430 | state = find_first_extent_bit_state(tree, start, bits); |
e6138876 | 1431 | got_it: |
69261c4b | 1432 | if (state) { |
e6138876 | 1433 | cache_state(state, cached_state); |
69261c4b XG |
1434 | *start_ret = state->start; |
1435 | *end_ret = state->end; | |
1436 | ret = 0; | |
1437 | } | |
e6138876 | 1438 | out: |
69261c4b XG |
1439 | spin_unlock(&tree->lock); |
1440 | return ret; | |
1441 | } | |
1442 | ||
d352ac68 CM |
1443 | /* |
1444 | * find a contiguous range of bytes in the file marked as delalloc, not | |
1445 | * more than 'max_bytes'. start and end are used to return the range, | |
1446 | * | |
1447 | * 1 is returned if we find something, 0 if nothing was in the tree | |
1448 | */ | |
c8b97818 | 1449 | static noinline u64 find_delalloc_range(struct extent_io_tree *tree, |
c2a128d2 JB |
1450 | u64 *start, u64 *end, u64 max_bytes, |
1451 | struct extent_state **cached_state) | |
d1310b2e CM |
1452 | { |
1453 | struct rb_node *node; | |
1454 | struct extent_state *state; | |
1455 | u64 cur_start = *start; | |
1456 | u64 found = 0; | |
1457 | u64 total_bytes = 0; | |
1458 | ||
cad321ad | 1459 | spin_lock(&tree->lock); |
c8b97818 | 1460 | |
d1310b2e CM |
1461 | /* |
1462 | * this search will find all the extents that end after | |
1463 | * our range starts. | |
1464 | */ | |
80ea96b1 | 1465 | node = tree_search(tree, cur_start); |
2b114d1d | 1466 | if (!node) { |
3b951516 CM |
1467 | if (!found) |
1468 | *end = (u64)-1; | |
d1310b2e CM |
1469 | goto out; |
1470 | } | |
1471 | ||
d397712b | 1472 | while (1) { |
d1310b2e | 1473 | state = rb_entry(node, struct extent_state, rb_node); |
5b21f2ed ZY |
1474 | if (found && (state->start != cur_start || |
1475 | (state->state & EXTENT_BOUNDARY))) { | |
d1310b2e CM |
1476 | goto out; |
1477 | } | |
1478 | if (!(state->state & EXTENT_DELALLOC)) { | |
1479 | if (!found) | |
1480 | *end = state->end; | |
1481 | goto out; | |
1482 | } | |
c2a128d2 | 1483 | if (!found) { |
d1310b2e | 1484 | *start = state->start; |
c2a128d2 JB |
1485 | *cached_state = state; |
1486 | atomic_inc(&state->refs); | |
1487 | } | |
d1310b2e CM |
1488 | found++; |
1489 | *end = state->end; | |
1490 | cur_start = state->end + 1; | |
1491 | node = rb_next(node); | |
d1310b2e | 1492 | total_bytes += state->end - state->start + 1; |
7bf811a5 | 1493 | if (total_bytes >= max_bytes) |
573aecaf | 1494 | break; |
573aecaf | 1495 | if (!node) |
d1310b2e CM |
1496 | break; |
1497 | } | |
1498 | out: | |
cad321ad | 1499 | spin_unlock(&tree->lock); |
d1310b2e CM |
1500 | return found; |
1501 | } | |
1502 | ||
143bede5 JM |
1503 | static noinline void __unlock_for_delalloc(struct inode *inode, |
1504 | struct page *locked_page, | |
1505 | u64 start, u64 end) | |
c8b97818 CM |
1506 | { |
1507 | int ret; | |
1508 | struct page *pages[16]; | |
1509 | unsigned long index = start >> PAGE_CACHE_SHIFT; | |
1510 | unsigned long end_index = end >> PAGE_CACHE_SHIFT; | |
1511 | unsigned long nr_pages = end_index - index + 1; | |
1512 | int i; | |
1513 | ||
1514 | if (index == locked_page->index && end_index == index) | |
143bede5 | 1515 | return; |
c8b97818 | 1516 | |
d397712b | 1517 | while (nr_pages > 0) { |
c8b97818 | 1518 | ret = find_get_pages_contig(inode->i_mapping, index, |
5b050f04 CM |
1519 | min_t(unsigned long, nr_pages, |
1520 | ARRAY_SIZE(pages)), pages); | |
c8b97818 CM |
1521 | for (i = 0; i < ret; i++) { |
1522 | if (pages[i] != locked_page) | |
1523 | unlock_page(pages[i]); | |
1524 | page_cache_release(pages[i]); | |
1525 | } | |
1526 | nr_pages -= ret; | |
1527 | index += ret; | |
1528 | cond_resched(); | |
1529 | } | |
c8b97818 CM |
1530 | } |
1531 | ||
1532 | static noinline int lock_delalloc_pages(struct inode *inode, | |
1533 | struct page *locked_page, | |
1534 | u64 delalloc_start, | |
1535 | u64 delalloc_end) | |
1536 | { | |
1537 | unsigned long index = delalloc_start >> PAGE_CACHE_SHIFT; | |
1538 | unsigned long start_index = index; | |
1539 | unsigned long end_index = delalloc_end >> PAGE_CACHE_SHIFT; | |
1540 | unsigned long pages_locked = 0; | |
1541 | struct page *pages[16]; | |
1542 | unsigned long nrpages; | |
1543 | int ret; | |
1544 | int i; | |
1545 | ||
1546 | /* the caller is responsible for locking the start index */ | |
1547 | if (index == locked_page->index && index == end_index) | |
1548 | return 0; | |
1549 | ||
1550 | /* skip the page at the start index */ | |
1551 | nrpages = end_index - index + 1; | |
d397712b | 1552 | while (nrpages > 0) { |
c8b97818 | 1553 | ret = find_get_pages_contig(inode->i_mapping, index, |
5b050f04 CM |
1554 | min_t(unsigned long, |
1555 | nrpages, ARRAY_SIZE(pages)), pages); | |
c8b97818 CM |
1556 | if (ret == 0) { |
1557 | ret = -EAGAIN; | |
1558 | goto done; | |
1559 | } | |
1560 | /* now we have an array of pages, lock them all */ | |
1561 | for (i = 0; i < ret; i++) { | |
1562 | /* | |
1563 | * the caller is taking responsibility for | |
1564 | * locked_page | |
1565 | */ | |
771ed689 | 1566 | if (pages[i] != locked_page) { |
c8b97818 | 1567 | lock_page(pages[i]); |
f2b1c41c CM |
1568 | if (!PageDirty(pages[i]) || |
1569 | pages[i]->mapping != inode->i_mapping) { | |
771ed689 CM |
1570 | ret = -EAGAIN; |
1571 | unlock_page(pages[i]); | |
1572 | page_cache_release(pages[i]); | |
1573 | goto done; | |
1574 | } | |
1575 | } | |
c8b97818 | 1576 | page_cache_release(pages[i]); |
771ed689 | 1577 | pages_locked++; |
c8b97818 | 1578 | } |
c8b97818 CM |
1579 | nrpages -= ret; |
1580 | index += ret; | |
1581 | cond_resched(); | |
1582 | } | |
1583 | ret = 0; | |
1584 | done: | |
1585 | if (ret && pages_locked) { | |
1586 | __unlock_for_delalloc(inode, locked_page, | |
1587 | delalloc_start, | |
1588 | ((u64)(start_index + pages_locked - 1)) << | |
1589 | PAGE_CACHE_SHIFT); | |
1590 | } | |
1591 | return ret; | |
1592 | } | |
1593 | ||
1594 | /* | |
1595 | * find a contiguous range of bytes in the file marked as delalloc, not | |
1596 | * more than 'max_bytes'. start and end are used to return the range, | |
1597 | * | |
1598 | * 1 is returned if we find something, 0 if nothing was in the tree | |
1599 | */ | |
294e30fe JB |
1600 | STATIC u64 find_lock_delalloc_range(struct inode *inode, |
1601 | struct extent_io_tree *tree, | |
1602 | struct page *locked_page, u64 *start, | |
1603 | u64 *end, u64 max_bytes) | |
c8b97818 CM |
1604 | { |
1605 | u64 delalloc_start; | |
1606 | u64 delalloc_end; | |
1607 | u64 found; | |
9655d298 | 1608 | struct extent_state *cached_state = NULL; |
c8b97818 CM |
1609 | int ret; |
1610 | int loops = 0; | |
1611 | ||
1612 | again: | |
1613 | /* step one, find a bunch of delalloc bytes starting at start */ | |
1614 | delalloc_start = *start; | |
1615 | delalloc_end = 0; | |
1616 | found = find_delalloc_range(tree, &delalloc_start, &delalloc_end, | |
c2a128d2 | 1617 | max_bytes, &cached_state); |
70b99e69 | 1618 | if (!found || delalloc_end <= *start) { |
c8b97818 CM |
1619 | *start = delalloc_start; |
1620 | *end = delalloc_end; | |
c2a128d2 | 1621 | free_extent_state(cached_state); |
385fe0be | 1622 | return 0; |
c8b97818 CM |
1623 | } |
1624 | ||
70b99e69 CM |
1625 | /* |
1626 | * start comes from the offset of locked_page. We have to lock | |
1627 | * pages in order, so we can't process delalloc bytes before | |
1628 | * locked_page | |
1629 | */ | |
d397712b | 1630 | if (delalloc_start < *start) |
70b99e69 | 1631 | delalloc_start = *start; |
70b99e69 | 1632 | |
c8b97818 CM |
1633 | /* |
1634 | * make sure to limit the number of pages we try to lock down | |
c8b97818 | 1635 | */ |
7bf811a5 JB |
1636 | if (delalloc_end + 1 - delalloc_start > max_bytes) |
1637 | delalloc_end = delalloc_start + max_bytes - 1; | |
d397712b | 1638 | |
c8b97818 CM |
1639 | /* step two, lock all the pages after the page that has start */ |
1640 | ret = lock_delalloc_pages(inode, locked_page, | |
1641 | delalloc_start, delalloc_end); | |
1642 | if (ret == -EAGAIN) { | |
1643 | /* some of the pages are gone, lets avoid looping by | |
1644 | * shortening the size of the delalloc range we're searching | |
1645 | */ | |
9655d298 | 1646 | free_extent_state(cached_state); |
c8b97818 | 1647 | if (!loops) { |
7bf811a5 | 1648 | max_bytes = PAGE_CACHE_SIZE; |
c8b97818 CM |
1649 | loops = 1; |
1650 | goto again; | |
1651 | } else { | |
1652 | found = 0; | |
1653 | goto out_failed; | |
1654 | } | |
1655 | } | |
79787eaa | 1656 | BUG_ON(ret); /* Only valid values are 0 and -EAGAIN */ |
c8b97818 CM |
1657 | |
1658 | /* step three, lock the state bits for the whole range */ | |
d0082371 | 1659 | lock_extent_bits(tree, delalloc_start, delalloc_end, 0, &cached_state); |
c8b97818 CM |
1660 | |
1661 | /* then test to make sure it is all still delalloc */ | |
1662 | ret = test_range_bit(tree, delalloc_start, delalloc_end, | |
9655d298 | 1663 | EXTENT_DELALLOC, 1, cached_state); |
c8b97818 | 1664 | if (!ret) { |
9655d298 CM |
1665 | unlock_extent_cached(tree, delalloc_start, delalloc_end, |
1666 | &cached_state, GFP_NOFS); | |
c8b97818 CM |
1667 | __unlock_for_delalloc(inode, locked_page, |
1668 | delalloc_start, delalloc_end); | |
1669 | cond_resched(); | |
1670 | goto again; | |
1671 | } | |
9655d298 | 1672 | free_extent_state(cached_state); |
c8b97818 CM |
1673 | *start = delalloc_start; |
1674 | *end = delalloc_end; | |
1675 | out_failed: | |
1676 | return found; | |
1677 | } | |
1678 | ||
c2790a2e JB |
1679 | int extent_clear_unlock_delalloc(struct inode *inode, u64 start, u64 end, |
1680 | struct page *locked_page, | |
1681 | unsigned long clear_bits, | |
1682 | unsigned long page_ops) | |
c8b97818 | 1683 | { |
c2790a2e | 1684 | struct extent_io_tree *tree = &BTRFS_I(inode)->io_tree; |
c8b97818 CM |
1685 | int ret; |
1686 | struct page *pages[16]; | |
1687 | unsigned long index = start >> PAGE_CACHE_SHIFT; | |
1688 | unsigned long end_index = end >> PAGE_CACHE_SHIFT; | |
1689 | unsigned long nr_pages = end_index - index + 1; | |
1690 | int i; | |
771ed689 | 1691 | |
2c64c53d | 1692 | clear_extent_bit(tree, start, end, clear_bits, 1, 0, NULL, GFP_NOFS); |
c2790a2e | 1693 | if (page_ops == 0) |
771ed689 | 1694 | return 0; |
c8b97818 | 1695 | |
d397712b | 1696 | while (nr_pages > 0) { |
c8b97818 | 1697 | ret = find_get_pages_contig(inode->i_mapping, index, |
5b050f04 CM |
1698 | min_t(unsigned long, |
1699 | nr_pages, ARRAY_SIZE(pages)), pages); | |
c8b97818 | 1700 | for (i = 0; i < ret; i++) { |
8b62b72b | 1701 | |
c2790a2e | 1702 | if (page_ops & PAGE_SET_PRIVATE2) |
8b62b72b CM |
1703 | SetPagePrivate2(pages[i]); |
1704 | ||
c8b97818 CM |
1705 | if (pages[i] == locked_page) { |
1706 | page_cache_release(pages[i]); | |
1707 | continue; | |
1708 | } | |
c2790a2e | 1709 | if (page_ops & PAGE_CLEAR_DIRTY) |
c8b97818 | 1710 | clear_page_dirty_for_io(pages[i]); |
c2790a2e | 1711 | if (page_ops & PAGE_SET_WRITEBACK) |
c8b97818 | 1712 | set_page_writeback(pages[i]); |
c2790a2e | 1713 | if (page_ops & PAGE_END_WRITEBACK) |
c8b97818 | 1714 | end_page_writeback(pages[i]); |
c2790a2e | 1715 | if (page_ops & PAGE_UNLOCK) |
771ed689 | 1716 | unlock_page(pages[i]); |
c8b97818 CM |
1717 | page_cache_release(pages[i]); |
1718 | } | |
1719 | nr_pages -= ret; | |
1720 | index += ret; | |
1721 | cond_resched(); | |
1722 | } | |
1723 | return 0; | |
1724 | } | |
c8b97818 | 1725 | |
d352ac68 CM |
1726 | /* |
1727 | * count the number of bytes in the tree that have a given bit(s) | |
1728 | * set. This can be fairly slow, except for EXTENT_DIRTY which is | |
1729 | * cached. The total number found is returned. | |
1730 | */ | |
d1310b2e CM |
1731 | u64 count_range_bits(struct extent_io_tree *tree, |
1732 | u64 *start, u64 search_end, u64 max_bytes, | |
ec29ed5b | 1733 | unsigned long bits, int contig) |
d1310b2e CM |
1734 | { |
1735 | struct rb_node *node; | |
1736 | struct extent_state *state; | |
1737 | u64 cur_start = *start; | |
1738 | u64 total_bytes = 0; | |
ec29ed5b | 1739 | u64 last = 0; |
d1310b2e CM |
1740 | int found = 0; |
1741 | ||
fae7f21c | 1742 | if (WARN_ON(search_end <= cur_start)) |
d1310b2e | 1743 | return 0; |
d1310b2e | 1744 | |
cad321ad | 1745 | spin_lock(&tree->lock); |
d1310b2e CM |
1746 | if (cur_start == 0 && bits == EXTENT_DIRTY) { |
1747 | total_bytes = tree->dirty_bytes; | |
1748 | goto out; | |
1749 | } | |
1750 | /* | |
1751 | * this search will find all the extents that end after | |
1752 | * our range starts. | |
1753 | */ | |
80ea96b1 | 1754 | node = tree_search(tree, cur_start); |
d397712b | 1755 | if (!node) |
d1310b2e | 1756 | goto out; |
d1310b2e | 1757 | |
d397712b | 1758 | while (1) { |
d1310b2e CM |
1759 | state = rb_entry(node, struct extent_state, rb_node); |
1760 | if (state->start > search_end) | |
1761 | break; | |
ec29ed5b CM |
1762 | if (contig && found && state->start > last + 1) |
1763 | break; | |
1764 | if (state->end >= cur_start && (state->state & bits) == bits) { | |
d1310b2e CM |
1765 | total_bytes += min(search_end, state->end) + 1 - |
1766 | max(cur_start, state->start); | |
1767 | if (total_bytes >= max_bytes) | |
1768 | break; | |
1769 | if (!found) { | |
af60bed2 | 1770 | *start = max(cur_start, state->start); |
d1310b2e CM |
1771 | found = 1; |
1772 | } | |
ec29ed5b CM |
1773 | last = state->end; |
1774 | } else if (contig && found) { | |
1775 | break; | |
d1310b2e CM |
1776 | } |
1777 | node = rb_next(node); | |
1778 | if (!node) | |
1779 | break; | |
1780 | } | |
1781 | out: | |
cad321ad | 1782 | spin_unlock(&tree->lock); |
d1310b2e CM |
1783 | return total_bytes; |
1784 | } | |
b2950863 | 1785 | |
d352ac68 CM |
1786 | /* |
1787 | * set the private field for a given byte offset in the tree. If there isn't | |
1788 | * an extent_state there already, this does nothing. | |
1789 | */ | |
171170c1 | 1790 | static int set_state_private(struct extent_io_tree *tree, u64 start, u64 private) |
d1310b2e CM |
1791 | { |
1792 | struct rb_node *node; | |
1793 | struct extent_state *state; | |
1794 | int ret = 0; | |
1795 | ||
cad321ad | 1796 | spin_lock(&tree->lock); |
d1310b2e CM |
1797 | /* |
1798 | * this search will find all the extents that end after | |
1799 | * our range starts. | |
1800 | */ | |
80ea96b1 | 1801 | node = tree_search(tree, start); |
2b114d1d | 1802 | if (!node) { |
d1310b2e CM |
1803 | ret = -ENOENT; |
1804 | goto out; | |
1805 | } | |
1806 | state = rb_entry(node, struct extent_state, rb_node); | |
1807 | if (state->start != start) { | |
1808 | ret = -ENOENT; | |
1809 | goto out; | |
1810 | } | |
1811 | state->private = private; | |
1812 | out: | |
cad321ad | 1813 | spin_unlock(&tree->lock); |
d1310b2e CM |
1814 | return ret; |
1815 | } | |
1816 | ||
1817 | int get_state_private(struct extent_io_tree *tree, u64 start, u64 *private) | |
1818 | { | |
1819 | struct rb_node *node; | |
1820 | struct extent_state *state; | |
1821 | int ret = 0; | |
1822 | ||
cad321ad | 1823 | spin_lock(&tree->lock); |
d1310b2e CM |
1824 | /* |
1825 | * this search will find all the extents that end after | |
1826 | * our range starts. | |
1827 | */ | |
80ea96b1 | 1828 | node = tree_search(tree, start); |
2b114d1d | 1829 | if (!node) { |
d1310b2e CM |
1830 | ret = -ENOENT; |
1831 | goto out; | |
1832 | } | |
1833 | state = rb_entry(node, struct extent_state, rb_node); | |
1834 | if (state->start != start) { | |
1835 | ret = -ENOENT; | |
1836 | goto out; | |
1837 | } | |
1838 | *private = state->private; | |
1839 | out: | |
cad321ad | 1840 | spin_unlock(&tree->lock); |
d1310b2e CM |
1841 | return ret; |
1842 | } | |
1843 | ||
1844 | /* | |
1845 | * searches a range in the state tree for a given mask. | |
70dec807 | 1846 | * If 'filled' == 1, this returns 1 only if every extent in the tree |
d1310b2e CM |
1847 | * has the bits set. Otherwise, 1 is returned if any bit in the |
1848 | * range is found set. | |
1849 | */ | |
1850 | int test_range_bit(struct extent_io_tree *tree, u64 start, u64 end, | |
41074888 | 1851 | unsigned long bits, int filled, struct extent_state *cached) |
d1310b2e CM |
1852 | { |
1853 | struct extent_state *state = NULL; | |
1854 | struct rb_node *node; | |
1855 | int bitset = 0; | |
d1310b2e | 1856 | |
cad321ad | 1857 | spin_lock(&tree->lock); |
df98b6e2 JB |
1858 | if (cached && cached->tree && cached->start <= start && |
1859 | cached->end > start) | |
9655d298 CM |
1860 | node = &cached->rb_node; |
1861 | else | |
1862 | node = tree_search(tree, start); | |
d1310b2e CM |
1863 | while (node && start <= end) { |
1864 | state = rb_entry(node, struct extent_state, rb_node); | |
1865 | ||
1866 | if (filled && state->start > start) { | |
1867 | bitset = 0; | |
1868 | break; | |
1869 | } | |
1870 | ||
1871 | if (state->start > end) | |
1872 | break; | |
1873 | ||
1874 | if (state->state & bits) { | |
1875 | bitset = 1; | |
1876 | if (!filled) | |
1877 | break; | |
1878 | } else if (filled) { | |
1879 | bitset = 0; | |
1880 | break; | |
1881 | } | |
46562cec CM |
1882 | |
1883 | if (state->end == (u64)-1) | |
1884 | break; | |
1885 | ||
d1310b2e CM |
1886 | start = state->end + 1; |
1887 | if (start > end) | |
1888 | break; | |
1889 | node = rb_next(node); | |
1890 | if (!node) { | |
1891 | if (filled) | |
1892 | bitset = 0; | |
1893 | break; | |
1894 | } | |
1895 | } | |
cad321ad | 1896 | spin_unlock(&tree->lock); |
d1310b2e CM |
1897 | return bitset; |
1898 | } | |
d1310b2e CM |
1899 | |
1900 | /* | |
1901 | * helper function to set a given page up to date if all the | |
1902 | * extents in the tree for that page are up to date | |
1903 | */ | |
143bede5 | 1904 | static void check_page_uptodate(struct extent_io_tree *tree, struct page *page) |
d1310b2e | 1905 | { |
4eee4fa4 | 1906 | u64 start = page_offset(page); |
d1310b2e | 1907 | u64 end = start + PAGE_CACHE_SIZE - 1; |
9655d298 | 1908 | if (test_range_bit(tree, start, end, EXTENT_UPTODATE, 1, NULL)) |
d1310b2e | 1909 | SetPageUptodate(page); |
d1310b2e CM |
1910 | } |
1911 | ||
4a54c8c1 JS |
1912 | /* |
1913 | * When IO fails, either with EIO or csum verification fails, we | |
1914 | * try other mirrors that might have a good copy of the data. This | |
1915 | * io_failure_record is used to record state as we go through all the | |
1916 | * mirrors. If another mirror has good data, the page is set up to date | |
1917 | * and things continue. If a good mirror can't be found, the original | |
1918 | * bio end_io callback is called to indicate things have failed. | |
1919 | */ | |
1920 | struct io_failure_record { | |
1921 | struct page *page; | |
1922 | u64 start; | |
1923 | u64 len; | |
1924 | u64 logical; | |
1925 | unsigned long bio_flags; | |
1926 | int this_mirror; | |
1927 | int failed_mirror; | |
1928 | int in_validation; | |
1929 | }; | |
1930 | ||
1931 | static int free_io_failure(struct inode *inode, struct io_failure_record *rec, | |
1932 | int did_repair) | |
1933 | { | |
1934 | int ret; | |
1935 | int err = 0; | |
1936 | struct extent_io_tree *failure_tree = &BTRFS_I(inode)->io_failure_tree; | |
1937 | ||
1938 | set_state_private(failure_tree, rec->start, 0); | |
1939 | ret = clear_extent_bits(failure_tree, rec->start, | |
1940 | rec->start + rec->len - 1, | |
1941 | EXTENT_LOCKED | EXTENT_DIRTY, GFP_NOFS); | |
1942 | if (ret) | |
1943 | err = ret; | |
1944 | ||
53b381b3 DW |
1945 | ret = clear_extent_bits(&BTRFS_I(inode)->io_tree, rec->start, |
1946 | rec->start + rec->len - 1, | |
1947 | EXTENT_DAMAGED, GFP_NOFS); | |
1948 | if (ret && !err) | |
1949 | err = ret; | |
4a54c8c1 JS |
1950 | |
1951 | kfree(rec); | |
1952 | return err; | |
1953 | } | |
1954 | ||
1955 | static void repair_io_failure_callback(struct bio *bio, int err) | |
1956 | { | |
1957 | complete(bio->bi_private); | |
1958 | } | |
1959 | ||
1960 | /* | |
1961 | * this bypasses the standard btrfs submit functions deliberately, as | |
1962 | * the standard behavior is to write all copies in a raid setup. here we only | |
1963 | * want to write the one bad copy. so we do the mapping for ourselves and issue | |
1964 | * submit_bio directly. | |
3ec706c8 | 1965 | * to avoid any synchronization issues, wait for the data after writing, which |
4a54c8c1 JS |
1966 | * actually prevents the read that triggered the error from finishing. |
1967 | * currently, there can be no more than two copies of every data bit. thus, | |
1968 | * exactly one rewrite is required. | |
1969 | */ | |
3ec706c8 | 1970 | int repair_io_failure(struct btrfs_fs_info *fs_info, u64 start, |
4a54c8c1 JS |
1971 | u64 length, u64 logical, struct page *page, |
1972 | int mirror_num) | |
1973 | { | |
1974 | struct bio *bio; | |
1975 | struct btrfs_device *dev; | |
1976 | DECLARE_COMPLETION_ONSTACK(compl); | |
1977 | u64 map_length = 0; | |
1978 | u64 sector; | |
1979 | struct btrfs_bio *bbio = NULL; | |
53b381b3 | 1980 | struct btrfs_mapping_tree *map_tree = &fs_info->mapping_tree; |
4a54c8c1 JS |
1981 | int ret; |
1982 | ||
1983 | BUG_ON(!mirror_num); | |
1984 | ||
53b381b3 DW |
1985 | /* we can't repair anything in raid56 yet */ |
1986 | if (btrfs_is_parity_mirror(map_tree, logical, length, mirror_num)) | |
1987 | return 0; | |
1988 | ||
9be3395b | 1989 | bio = btrfs_io_bio_alloc(GFP_NOFS, 1); |
4a54c8c1 JS |
1990 | if (!bio) |
1991 | return -EIO; | |
1992 | bio->bi_private = &compl; | |
1993 | bio->bi_end_io = repair_io_failure_callback; | |
1994 | bio->bi_size = 0; | |
1995 | map_length = length; | |
1996 | ||
3ec706c8 | 1997 | ret = btrfs_map_block(fs_info, WRITE, logical, |
4a54c8c1 JS |
1998 | &map_length, &bbio, mirror_num); |
1999 | if (ret) { | |
2000 | bio_put(bio); | |
2001 | return -EIO; | |
2002 | } | |
2003 | BUG_ON(mirror_num != bbio->mirror_num); | |
2004 | sector = bbio->stripes[mirror_num-1].physical >> 9; | |
2005 | bio->bi_sector = sector; | |
2006 | dev = bbio->stripes[mirror_num-1].dev; | |
2007 | kfree(bbio); | |
2008 | if (!dev || !dev->bdev || !dev->writeable) { | |
2009 | bio_put(bio); | |
2010 | return -EIO; | |
2011 | } | |
2012 | bio->bi_bdev = dev->bdev; | |
4eee4fa4 | 2013 | bio_add_page(bio, page, length, start - page_offset(page)); |
21adbd5c | 2014 | btrfsic_submit_bio(WRITE_SYNC, bio); |
4a54c8c1 JS |
2015 | wait_for_completion(&compl); |
2016 | ||
2017 | if (!test_bit(BIO_UPTODATE, &bio->bi_flags)) { | |
2018 | /* try to remap that extent elsewhere? */ | |
2019 | bio_put(bio); | |
442a4f63 | 2020 | btrfs_dev_stat_inc_and_print(dev, BTRFS_DEV_STAT_WRITE_ERRS); |
4a54c8c1 JS |
2021 | return -EIO; |
2022 | } | |
2023 | ||
d5b025d5 | 2024 | printk_ratelimited_in_rcu(KERN_INFO "btrfs read error corrected: ino %lu off %llu " |
606686ee JB |
2025 | "(dev %s sector %llu)\n", page->mapping->host->i_ino, |
2026 | start, rcu_str_deref(dev->name), sector); | |
4a54c8c1 JS |
2027 | |
2028 | bio_put(bio); | |
2029 | return 0; | |
2030 | } | |
2031 | ||
ea466794 JB |
2032 | int repair_eb_io_failure(struct btrfs_root *root, struct extent_buffer *eb, |
2033 | int mirror_num) | |
2034 | { | |
ea466794 JB |
2035 | u64 start = eb->start; |
2036 | unsigned long i, num_pages = num_extent_pages(eb->start, eb->len); | |
d95603b2 | 2037 | int ret = 0; |
ea466794 JB |
2038 | |
2039 | for (i = 0; i < num_pages; i++) { | |
2040 | struct page *p = extent_buffer_page(eb, i); | |
3ec706c8 | 2041 | ret = repair_io_failure(root->fs_info, start, PAGE_CACHE_SIZE, |
ea466794 JB |
2042 | start, p, mirror_num); |
2043 | if (ret) | |
2044 | break; | |
2045 | start += PAGE_CACHE_SIZE; | |
2046 | } | |
2047 | ||
2048 | return ret; | |
2049 | } | |
2050 | ||
4a54c8c1 JS |
2051 | /* |
2052 | * each time an IO finishes, we do a fast check in the IO failure tree | |
2053 | * to see if we need to process or clean up an io_failure_record | |
2054 | */ | |
2055 | static int clean_io_failure(u64 start, struct page *page) | |
2056 | { | |
2057 | u64 private; | |
2058 | u64 private_failure; | |
2059 | struct io_failure_record *failrec; | |
3ec706c8 | 2060 | struct btrfs_fs_info *fs_info; |
4a54c8c1 JS |
2061 | struct extent_state *state; |
2062 | int num_copies; | |
2063 | int did_repair = 0; | |
2064 | int ret; | |
2065 | struct inode *inode = page->mapping->host; | |
2066 | ||
2067 | private = 0; | |
2068 | ret = count_range_bits(&BTRFS_I(inode)->io_failure_tree, &private, | |
2069 | (u64)-1, 1, EXTENT_DIRTY, 0); | |
2070 | if (!ret) | |
2071 | return 0; | |
2072 | ||
2073 | ret = get_state_private(&BTRFS_I(inode)->io_failure_tree, start, | |
2074 | &private_failure); | |
2075 | if (ret) | |
2076 | return 0; | |
2077 | ||
2078 | failrec = (struct io_failure_record *)(unsigned long) private_failure; | |
2079 | BUG_ON(!failrec->this_mirror); | |
2080 | ||
2081 | if (failrec->in_validation) { | |
2082 | /* there was no real error, just free the record */ | |
2083 | pr_debug("clean_io_failure: freeing dummy error at %llu\n", | |
2084 | failrec->start); | |
2085 | did_repair = 1; | |
2086 | goto out; | |
2087 | } | |
2088 | ||
2089 | spin_lock(&BTRFS_I(inode)->io_tree.lock); | |
2090 | state = find_first_extent_bit_state(&BTRFS_I(inode)->io_tree, | |
2091 | failrec->start, | |
2092 | EXTENT_LOCKED); | |
2093 | spin_unlock(&BTRFS_I(inode)->io_tree.lock); | |
2094 | ||
883d0de4 MX |
2095 | if (state && state->start <= failrec->start && |
2096 | state->end >= failrec->start + failrec->len - 1) { | |
3ec706c8 SB |
2097 | fs_info = BTRFS_I(inode)->root->fs_info; |
2098 | num_copies = btrfs_num_copies(fs_info, failrec->logical, | |
2099 | failrec->len); | |
4a54c8c1 | 2100 | if (num_copies > 1) { |
3ec706c8 | 2101 | ret = repair_io_failure(fs_info, start, failrec->len, |
4a54c8c1 JS |
2102 | failrec->logical, page, |
2103 | failrec->failed_mirror); | |
2104 | did_repair = !ret; | |
2105 | } | |
53b381b3 | 2106 | ret = 0; |
4a54c8c1 JS |
2107 | } |
2108 | ||
2109 | out: | |
2110 | if (!ret) | |
2111 | ret = free_io_failure(inode, failrec, did_repair); | |
2112 | ||
2113 | return ret; | |
2114 | } | |
2115 | ||
2116 | /* | |
2117 | * this is a generic handler for readpage errors (default | |
2118 | * readpage_io_failed_hook). if other copies exist, read those and write back | |
2119 | * good data to the failed position. does not investigate in remapping the | |
2120 | * failed extent elsewhere, hoping the device will be smart enough to do this as | |
2121 | * needed | |
2122 | */ | |
2123 | ||
facc8a22 MX |
2124 | static int bio_readpage_error(struct bio *failed_bio, u64 phy_offset, |
2125 | struct page *page, u64 start, u64 end, | |
2126 | int failed_mirror) | |
4a54c8c1 JS |
2127 | { |
2128 | struct io_failure_record *failrec = NULL; | |
2129 | u64 private; | |
2130 | struct extent_map *em; | |
2131 | struct inode *inode = page->mapping->host; | |
2132 | struct extent_io_tree *failure_tree = &BTRFS_I(inode)->io_failure_tree; | |
2133 | struct extent_io_tree *tree = &BTRFS_I(inode)->io_tree; | |
2134 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; | |
2135 | struct bio *bio; | |
facc8a22 MX |
2136 | struct btrfs_io_bio *btrfs_failed_bio; |
2137 | struct btrfs_io_bio *btrfs_bio; | |
4a54c8c1 JS |
2138 | int num_copies; |
2139 | int ret; | |
2140 | int read_mode; | |
2141 | u64 logical; | |
2142 | ||
2143 | BUG_ON(failed_bio->bi_rw & REQ_WRITE); | |
2144 | ||
2145 | ret = get_state_private(failure_tree, start, &private); | |
2146 | if (ret) { | |
2147 | failrec = kzalloc(sizeof(*failrec), GFP_NOFS); | |
2148 | if (!failrec) | |
2149 | return -ENOMEM; | |
2150 | failrec->start = start; | |
2151 | failrec->len = end - start + 1; | |
2152 | failrec->this_mirror = 0; | |
2153 | failrec->bio_flags = 0; | |
2154 | failrec->in_validation = 0; | |
2155 | ||
2156 | read_lock(&em_tree->lock); | |
2157 | em = lookup_extent_mapping(em_tree, start, failrec->len); | |
2158 | if (!em) { | |
2159 | read_unlock(&em_tree->lock); | |
2160 | kfree(failrec); | |
2161 | return -EIO; | |
2162 | } | |
2163 | ||
2164 | if (em->start > start || em->start + em->len < start) { | |
2165 | free_extent_map(em); | |
2166 | em = NULL; | |
2167 | } | |
2168 | read_unlock(&em_tree->lock); | |
2169 | ||
7a2d6a64 | 2170 | if (!em) { |
4a54c8c1 JS |
2171 | kfree(failrec); |
2172 | return -EIO; | |
2173 | } | |
2174 | logical = start - em->start; | |
2175 | logical = em->block_start + logical; | |
2176 | if (test_bit(EXTENT_FLAG_COMPRESSED, &em->flags)) { | |
2177 | logical = em->block_start; | |
2178 | failrec->bio_flags = EXTENT_BIO_COMPRESSED; | |
2179 | extent_set_compress_type(&failrec->bio_flags, | |
2180 | em->compress_type); | |
2181 | } | |
2182 | pr_debug("bio_readpage_error: (new) logical=%llu, start=%llu, " | |
2183 | "len=%llu\n", logical, start, failrec->len); | |
2184 | failrec->logical = logical; | |
2185 | free_extent_map(em); | |
2186 | ||
2187 | /* set the bits in the private failure tree */ | |
2188 | ret = set_extent_bits(failure_tree, start, end, | |
2189 | EXTENT_LOCKED | EXTENT_DIRTY, GFP_NOFS); | |
2190 | if (ret >= 0) | |
2191 | ret = set_state_private(failure_tree, start, | |
2192 | (u64)(unsigned long)failrec); | |
2193 | /* set the bits in the inode's tree */ | |
2194 | if (ret >= 0) | |
2195 | ret = set_extent_bits(tree, start, end, EXTENT_DAMAGED, | |
2196 | GFP_NOFS); | |
2197 | if (ret < 0) { | |
2198 | kfree(failrec); | |
2199 | return ret; | |
2200 | } | |
2201 | } else { | |
2202 | failrec = (struct io_failure_record *)(unsigned long)private; | |
2203 | pr_debug("bio_readpage_error: (found) logical=%llu, " | |
2204 | "start=%llu, len=%llu, validation=%d\n", | |
2205 | failrec->logical, failrec->start, failrec->len, | |
2206 | failrec->in_validation); | |
2207 | /* | |
2208 | * when data can be on disk more than twice, add to failrec here | |
2209 | * (e.g. with a list for failed_mirror) to make | |
2210 | * clean_io_failure() clean all those errors at once. | |
2211 | */ | |
2212 | } | |
5d964051 SB |
2213 | num_copies = btrfs_num_copies(BTRFS_I(inode)->root->fs_info, |
2214 | failrec->logical, failrec->len); | |
4a54c8c1 JS |
2215 | if (num_copies == 1) { |
2216 | /* | |
2217 | * we only have a single copy of the data, so don't bother with | |
2218 | * all the retry and error correction code that follows. no | |
2219 | * matter what the error is, it is very likely to persist. | |
2220 | */ | |
09a7f7a2 MX |
2221 | pr_debug("bio_readpage_error: cannot repair, num_copies=%d, next_mirror %d, failed_mirror %d\n", |
2222 | num_copies, failrec->this_mirror, failed_mirror); | |
4a54c8c1 JS |
2223 | free_io_failure(inode, failrec, 0); |
2224 | return -EIO; | |
2225 | } | |
2226 | ||
4a54c8c1 JS |
2227 | /* |
2228 | * there are two premises: | |
2229 | * a) deliver good data to the caller | |
2230 | * b) correct the bad sectors on disk | |
2231 | */ | |
2232 | if (failed_bio->bi_vcnt > 1) { | |
2233 | /* | |
2234 | * to fulfill b), we need to know the exact failing sectors, as | |
2235 | * we don't want to rewrite any more than the failed ones. thus, | |
2236 | * we need separate read requests for the failed bio | |
2237 | * | |
2238 | * if the following BUG_ON triggers, our validation request got | |
2239 | * merged. we need separate requests for our algorithm to work. | |
2240 | */ | |
2241 | BUG_ON(failrec->in_validation); | |
2242 | failrec->in_validation = 1; | |
2243 | failrec->this_mirror = failed_mirror; | |
2244 | read_mode = READ_SYNC | REQ_FAILFAST_DEV; | |
2245 | } else { | |
2246 | /* | |
2247 | * we're ready to fulfill a) and b) alongside. get a good copy | |
2248 | * of the failed sector and if we succeed, we have setup | |
2249 | * everything for repair_io_failure to do the rest for us. | |
2250 | */ | |
2251 | if (failrec->in_validation) { | |
2252 | BUG_ON(failrec->this_mirror != failed_mirror); | |
2253 | failrec->in_validation = 0; | |
2254 | failrec->this_mirror = 0; | |
2255 | } | |
2256 | failrec->failed_mirror = failed_mirror; | |
2257 | failrec->this_mirror++; | |
2258 | if (failrec->this_mirror == failed_mirror) | |
2259 | failrec->this_mirror++; | |
2260 | read_mode = READ_SYNC; | |
2261 | } | |
2262 | ||
facc8a22 MX |
2263 | if (failrec->this_mirror > num_copies) { |
2264 | pr_debug("bio_readpage_error: (fail) num_copies=%d, next_mirror %d, failed_mirror %d\n", | |
4a54c8c1 JS |
2265 | num_copies, failrec->this_mirror, failed_mirror); |
2266 | free_io_failure(inode, failrec, 0); | |
2267 | return -EIO; | |
2268 | } | |
2269 | ||
9be3395b | 2270 | bio = btrfs_io_bio_alloc(GFP_NOFS, 1); |
e627ee7b TI |
2271 | if (!bio) { |
2272 | free_io_failure(inode, failrec, 0); | |
2273 | return -EIO; | |
2274 | } | |
4a54c8c1 JS |
2275 | bio->bi_end_io = failed_bio->bi_end_io; |
2276 | bio->bi_sector = failrec->logical >> 9; | |
2277 | bio->bi_bdev = BTRFS_I(inode)->root->fs_info->fs_devices->latest_bdev; | |
2278 | bio->bi_size = 0; | |
2279 | ||
facc8a22 MX |
2280 | btrfs_failed_bio = btrfs_io_bio(failed_bio); |
2281 | if (btrfs_failed_bio->csum) { | |
2282 | struct btrfs_fs_info *fs_info = BTRFS_I(inode)->root->fs_info; | |
2283 | u16 csum_size = btrfs_super_csum_size(fs_info->super_copy); | |
2284 | ||
2285 | btrfs_bio = btrfs_io_bio(bio); | |
2286 | btrfs_bio->csum = btrfs_bio->csum_inline; | |
2287 | phy_offset >>= inode->i_sb->s_blocksize_bits; | |
2288 | phy_offset *= csum_size; | |
2289 | memcpy(btrfs_bio->csum, btrfs_failed_bio->csum + phy_offset, | |
2290 | csum_size); | |
2291 | } | |
2292 | ||
4a54c8c1 JS |
2293 | bio_add_page(bio, page, failrec->len, start - page_offset(page)); |
2294 | ||
2295 | pr_debug("bio_readpage_error: submitting new read[%#x] to " | |
2296 | "this_mirror=%d, num_copies=%d, in_validation=%d\n", read_mode, | |
2297 | failrec->this_mirror, num_copies, failrec->in_validation); | |
2298 | ||
013bd4c3 TI |
2299 | ret = tree->ops->submit_bio_hook(inode, read_mode, bio, |
2300 | failrec->this_mirror, | |
2301 | failrec->bio_flags, 0); | |
2302 | return ret; | |
4a54c8c1 JS |
2303 | } |
2304 | ||
d1310b2e CM |
2305 | /* lots and lots of room for performance fixes in the end_bio funcs */ |
2306 | ||
87826df0 JM |
2307 | int end_extent_writepage(struct page *page, int err, u64 start, u64 end) |
2308 | { | |
2309 | int uptodate = (err == 0); | |
2310 | struct extent_io_tree *tree; | |
2311 | int ret; | |
2312 | ||
2313 | tree = &BTRFS_I(page->mapping->host)->io_tree; | |
2314 | ||
2315 | if (tree->ops && tree->ops->writepage_end_io_hook) { | |
2316 | ret = tree->ops->writepage_end_io_hook(page, start, | |
2317 | end, NULL, uptodate); | |
2318 | if (ret) | |
2319 | uptodate = 0; | |
2320 | } | |
2321 | ||
87826df0 | 2322 | if (!uptodate) { |
87826df0 JM |
2323 | ClearPageUptodate(page); |
2324 | SetPageError(page); | |
2325 | } | |
2326 | return 0; | |
2327 | } | |
2328 | ||
d1310b2e CM |
2329 | /* |
2330 | * after a writepage IO is done, we need to: | |
2331 | * clear the uptodate bits on error | |
2332 | * clear the writeback bits in the extent tree for this IO | |
2333 | * end_page_writeback if the page has no more pending IO | |
2334 | * | |
2335 | * Scheduling is not allowed, so the extent state tree is expected | |
2336 | * to have one and only one object corresponding to this IO. | |
2337 | */ | |
d1310b2e | 2338 | static void end_bio_extent_writepage(struct bio *bio, int err) |
d1310b2e | 2339 | { |
d1310b2e | 2340 | struct bio_vec *bvec = bio->bi_io_vec + bio->bi_vcnt - 1; |
902b22f3 | 2341 | struct extent_io_tree *tree; |
d1310b2e CM |
2342 | u64 start; |
2343 | u64 end; | |
d1310b2e | 2344 | |
d1310b2e CM |
2345 | do { |
2346 | struct page *page = bvec->bv_page; | |
902b22f3 DW |
2347 | tree = &BTRFS_I(page->mapping->host)->io_tree; |
2348 | ||
17a5adcc AO |
2349 | /* We always issue full-page reads, but if some block |
2350 | * in a page fails to read, blk_update_request() will | |
2351 | * advance bv_offset and adjust bv_len to compensate. | |
2352 | * Print a warning for nonzero offsets, and an error | |
2353 | * if they don't add up to a full page. */ | |
2354 | if (bvec->bv_offset || bvec->bv_len != PAGE_CACHE_SIZE) | |
2355 | printk("%s page write in btrfs with offset %u and length %u\n", | |
2356 | bvec->bv_offset + bvec->bv_len != PAGE_CACHE_SIZE | |
2357 | ? KERN_ERR "partial" : KERN_INFO "incomplete", | |
2358 | bvec->bv_offset, bvec->bv_len); | |
d1310b2e | 2359 | |
17a5adcc AO |
2360 | start = page_offset(page); |
2361 | end = start + bvec->bv_offset + bvec->bv_len - 1; | |
d1310b2e CM |
2362 | |
2363 | if (--bvec >= bio->bi_io_vec) | |
2364 | prefetchw(&bvec->bv_page->flags); | |
1259ab75 | 2365 | |
87826df0 JM |
2366 | if (end_extent_writepage(page, err, start, end)) |
2367 | continue; | |
70dec807 | 2368 | |
17a5adcc | 2369 | end_page_writeback(page); |
d1310b2e | 2370 | } while (bvec >= bio->bi_io_vec); |
2b1f55b0 | 2371 | |
d1310b2e | 2372 | bio_put(bio); |
d1310b2e CM |
2373 | } |
2374 | ||
883d0de4 MX |
2375 | static void |
2376 | endio_readpage_release_extent(struct extent_io_tree *tree, u64 start, u64 len, | |
2377 | int uptodate) | |
2378 | { | |
2379 | struct extent_state *cached = NULL; | |
2380 | u64 end = start + len - 1; | |
2381 | ||
2382 | if (uptodate && tree->track_uptodate) | |
2383 | set_extent_uptodate(tree, start, end, &cached, GFP_ATOMIC); | |
2384 | unlock_extent_cached(tree, start, end, &cached, GFP_ATOMIC); | |
2385 | } | |
2386 | ||
d1310b2e CM |
2387 | /* |
2388 | * after a readpage IO is done, we need to: | |
2389 | * clear the uptodate bits on error | |
2390 | * set the uptodate bits if things worked | |
2391 | * set the page up to date if all extents in the tree are uptodate | |
2392 | * clear the lock bit in the extent tree | |
2393 | * unlock the page if there are no other extents locked for it | |
2394 | * | |
2395 | * Scheduling is not allowed, so the extent state tree is expected | |
2396 | * to have one and only one object corresponding to this IO. | |
2397 | */ | |
d1310b2e | 2398 | static void end_bio_extent_readpage(struct bio *bio, int err) |
d1310b2e CM |
2399 | { |
2400 | int uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags); | |
4125bf76 CM |
2401 | struct bio_vec *bvec_end = bio->bi_io_vec + bio->bi_vcnt - 1; |
2402 | struct bio_vec *bvec = bio->bi_io_vec; | |
facc8a22 | 2403 | struct btrfs_io_bio *io_bio = btrfs_io_bio(bio); |
902b22f3 | 2404 | struct extent_io_tree *tree; |
facc8a22 | 2405 | u64 offset = 0; |
d1310b2e CM |
2406 | u64 start; |
2407 | u64 end; | |
facc8a22 | 2408 | u64 len; |
883d0de4 MX |
2409 | u64 extent_start = 0; |
2410 | u64 extent_len = 0; | |
5cf1ab56 | 2411 | int mirror; |
d1310b2e CM |
2412 | int ret; |
2413 | ||
d20f7043 CM |
2414 | if (err) |
2415 | uptodate = 0; | |
2416 | ||
d1310b2e CM |
2417 | do { |
2418 | struct page *page = bvec->bv_page; | |
a71754fc | 2419 | struct inode *inode = page->mapping->host; |
507903b8 | 2420 | |
be3940c0 | 2421 | pr_debug("end_bio_extent_readpage: bi_sector=%llu, err=%d, " |
9be3395b CM |
2422 | "mirror=%lu\n", (u64)bio->bi_sector, err, |
2423 | io_bio->mirror_num); | |
a71754fc | 2424 | tree = &BTRFS_I(inode)->io_tree; |
902b22f3 | 2425 | |
17a5adcc AO |
2426 | /* We always issue full-page reads, but if some block |
2427 | * in a page fails to read, blk_update_request() will | |
2428 | * advance bv_offset and adjust bv_len to compensate. | |
2429 | * Print a warning for nonzero offsets, and an error | |
2430 | * if they don't add up to a full page. */ | |
2431 | if (bvec->bv_offset || bvec->bv_len != PAGE_CACHE_SIZE) | |
2432 | printk("%s page read in btrfs with offset %u and length %u\n", | |
2433 | bvec->bv_offset + bvec->bv_len != PAGE_CACHE_SIZE | |
2434 | ? KERN_ERR "partial" : KERN_INFO "incomplete", | |
2435 | bvec->bv_offset, bvec->bv_len); | |
d1310b2e | 2436 | |
17a5adcc AO |
2437 | start = page_offset(page); |
2438 | end = start + bvec->bv_offset + bvec->bv_len - 1; | |
facc8a22 | 2439 | len = bvec->bv_len; |
d1310b2e | 2440 | |
4125bf76 | 2441 | if (++bvec <= bvec_end) |
d1310b2e CM |
2442 | prefetchw(&bvec->bv_page->flags); |
2443 | ||
9be3395b | 2444 | mirror = io_bio->mirror_num; |
f2a09da9 MX |
2445 | if (likely(uptodate && tree->ops && |
2446 | tree->ops->readpage_end_io_hook)) { | |
facc8a22 MX |
2447 | ret = tree->ops->readpage_end_io_hook(io_bio, offset, |
2448 | page, start, end, | |
2449 | mirror); | |
5ee0844d | 2450 | if (ret) |
d1310b2e | 2451 | uptodate = 0; |
5ee0844d | 2452 | else |
4a54c8c1 | 2453 | clean_io_failure(start, page); |
d1310b2e | 2454 | } |
ea466794 | 2455 | |
f2a09da9 MX |
2456 | if (likely(uptodate)) |
2457 | goto readpage_ok; | |
2458 | ||
2459 | if (tree->ops && tree->ops->readpage_io_failed_hook) { | |
5cf1ab56 | 2460 | ret = tree->ops->readpage_io_failed_hook(page, mirror); |
ea466794 JB |
2461 | if (!ret && !err && |
2462 | test_bit(BIO_UPTODATE, &bio->bi_flags)) | |
2463 | uptodate = 1; | |
f2a09da9 | 2464 | } else { |
f4a8e656 JS |
2465 | /* |
2466 | * The generic bio_readpage_error handles errors the | |
2467 | * following way: If possible, new read requests are | |
2468 | * created and submitted and will end up in | |
2469 | * end_bio_extent_readpage as well (if we're lucky, not | |
2470 | * in the !uptodate case). In that case it returns 0 and | |
2471 | * we just go on with the next page in our bio. If it | |
2472 | * can't handle the error it will return -EIO and we | |
2473 | * remain responsible for that page. | |
2474 | */ | |
facc8a22 MX |
2475 | ret = bio_readpage_error(bio, offset, page, start, end, |
2476 | mirror); | |
7e38326f | 2477 | if (ret == 0) { |
3b951516 CM |
2478 | uptodate = |
2479 | test_bit(BIO_UPTODATE, &bio->bi_flags); | |
d20f7043 CM |
2480 | if (err) |
2481 | uptodate = 0; | |
7e38326f CM |
2482 | continue; |
2483 | } | |
2484 | } | |
f2a09da9 | 2485 | readpage_ok: |
883d0de4 | 2486 | if (likely(uptodate)) { |
a71754fc JB |
2487 | loff_t i_size = i_size_read(inode); |
2488 | pgoff_t end_index = i_size >> PAGE_CACHE_SHIFT; | |
2489 | unsigned offset; | |
2490 | ||
2491 | /* Zero out the end if this page straddles i_size */ | |
2492 | offset = i_size & (PAGE_CACHE_SIZE-1); | |
2493 | if (page->index == end_index && offset) | |
2494 | zero_user_segment(page, offset, PAGE_CACHE_SIZE); | |
17a5adcc | 2495 | SetPageUptodate(page); |
70dec807 | 2496 | } else { |
17a5adcc AO |
2497 | ClearPageUptodate(page); |
2498 | SetPageError(page); | |
70dec807 | 2499 | } |
17a5adcc | 2500 | unlock_page(page); |
facc8a22 | 2501 | offset += len; |
883d0de4 MX |
2502 | |
2503 | if (unlikely(!uptodate)) { | |
2504 | if (extent_len) { | |
2505 | endio_readpage_release_extent(tree, | |
2506 | extent_start, | |
2507 | extent_len, 1); | |
2508 | extent_start = 0; | |
2509 | extent_len = 0; | |
2510 | } | |
2511 | endio_readpage_release_extent(tree, start, | |
2512 | end - start + 1, 0); | |
2513 | } else if (!extent_len) { | |
2514 | extent_start = start; | |
2515 | extent_len = end + 1 - start; | |
2516 | } else if (extent_start + extent_len == start) { | |
2517 | extent_len += end + 1 - start; | |
2518 | } else { | |
2519 | endio_readpage_release_extent(tree, extent_start, | |
2520 | extent_len, uptodate); | |
2521 | extent_start = start; | |
2522 | extent_len = end + 1 - start; | |
2523 | } | |
4125bf76 | 2524 | } while (bvec <= bvec_end); |
d1310b2e | 2525 | |
883d0de4 MX |
2526 | if (extent_len) |
2527 | endio_readpage_release_extent(tree, extent_start, extent_len, | |
2528 | uptodate); | |
facc8a22 MX |
2529 | if (io_bio->end_io) |
2530 | io_bio->end_io(io_bio, err); | |
d1310b2e | 2531 | bio_put(bio); |
d1310b2e CM |
2532 | } |
2533 | ||
9be3395b CM |
2534 | /* |
2535 | * this allocates from the btrfs_bioset. We're returning a bio right now | |
2536 | * but you can call btrfs_io_bio for the appropriate container_of magic | |
2537 | */ | |
88f794ed MX |
2538 | struct bio * |
2539 | btrfs_bio_alloc(struct block_device *bdev, u64 first_sector, int nr_vecs, | |
2540 | gfp_t gfp_flags) | |
d1310b2e | 2541 | { |
facc8a22 | 2542 | struct btrfs_io_bio *btrfs_bio; |
d1310b2e CM |
2543 | struct bio *bio; |
2544 | ||
9be3395b | 2545 | bio = bio_alloc_bioset(gfp_flags, nr_vecs, btrfs_bioset); |
d1310b2e CM |
2546 | |
2547 | if (bio == NULL && (current->flags & PF_MEMALLOC)) { | |
9be3395b CM |
2548 | while (!bio && (nr_vecs /= 2)) { |
2549 | bio = bio_alloc_bioset(gfp_flags, | |
2550 | nr_vecs, btrfs_bioset); | |
2551 | } | |
d1310b2e CM |
2552 | } |
2553 | ||
2554 | if (bio) { | |
e1c4b745 | 2555 | bio->bi_size = 0; |
d1310b2e CM |
2556 | bio->bi_bdev = bdev; |
2557 | bio->bi_sector = first_sector; | |
facc8a22 MX |
2558 | btrfs_bio = btrfs_io_bio(bio); |
2559 | btrfs_bio->csum = NULL; | |
2560 | btrfs_bio->csum_allocated = NULL; | |
2561 | btrfs_bio->end_io = NULL; | |
d1310b2e CM |
2562 | } |
2563 | return bio; | |
2564 | } | |
2565 | ||
9be3395b CM |
2566 | struct bio *btrfs_bio_clone(struct bio *bio, gfp_t gfp_mask) |
2567 | { | |
2568 | return bio_clone_bioset(bio, gfp_mask, btrfs_bioset); | |
2569 | } | |
2570 | ||
2571 | ||
2572 | /* this also allocates from the btrfs_bioset */ | |
2573 | struct bio *btrfs_io_bio_alloc(gfp_t gfp_mask, unsigned int nr_iovecs) | |
2574 | { | |
facc8a22 MX |
2575 | struct btrfs_io_bio *btrfs_bio; |
2576 | struct bio *bio; | |
2577 | ||
2578 | bio = bio_alloc_bioset(gfp_mask, nr_iovecs, btrfs_bioset); | |
2579 | if (bio) { | |
2580 | btrfs_bio = btrfs_io_bio(bio); | |
2581 | btrfs_bio->csum = NULL; | |
2582 | btrfs_bio->csum_allocated = NULL; | |
2583 | btrfs_bio->end_io = NULL; | |
2584 | } | |
2585 | return bio; | |
9be3395b CM |
2586 | } |
2587 | ||
2588 | ||
355808c2 JM |
2589 | static int __must_check submit_one_bio(int rw, struct bio *bio, |
2590 | int mirror_num, unsigned long bio_flags) | |
d1310b2e | 2591 | { |
d1310b2e | 2592 | int ret = 0; |
70dec807 CM |
2593 | struct bio_vec *bvec = bio->bi_io_vec + bio->bi_vcnt - 1; |
2594 | struct page *page = bvec->bv_page; | |
2595 | struct extent_io_tree *tree = bio->bi_private; | |
70dec807 | 2596 | u64 start; |
70dec807 | 2597 | |
4eee4fa4 | 2598 | start = page_offset(page) + bvec->bv_offset; |
70dec807 | 2599 | |
902b22f3 | 2600 | bio->bi_private = NULL; |
d1310b2e CM |
2601 | |
2602 | bio_get(bio); | |
2603 | ||
065631f6 | 2604 | if (tree->ops && tree->ops->submit_bio_hook) |
6b82ce8d | 2605 | ret = tree->ops->submit_bio_hook(page->mapping->host, rw, bio, |
eaf25d93 | 2606 | mirror_num, bio_flags, start); |
0b86a832 | 2607 | else |
21adbd5c | 2608 | btrfsic_submit_bio(rw, bio); |
4a54c8c1 | 2609 | |
d1310b2e CM |
2610 | if (bio_flagged(bio, BIO_EOPNOTSUPP)) |
2611 | ret = -EOPNOTSUPP; | |
2612 | bio_put(bio); | |
2613 | return ret; | |
2614 | } | |
2615 | ||
64a16701 | 2616 | static int merge_bio(int rw, struct extent_io_tree *tree, struct page *page, |
3444a972 JM |
2617 | unsigned long offset, size_t size, struct bio *bio, |
2618 | unsigned long bio_flags) | |
2619 | { | |
2620 | int ret = 0; | |
2621 | if (tree->ops && tree->ops->merge_bio_hook) | |
64a16701 | 2622 | ret = tree->ops->merge_bio_hook(rw, page, offset, size, bio, |
3444a972 JM |
2623 | bio_flags); |
2624 | BUG_ON(ret < 0); | |
2625 | return ret; | |
2626 | ||
2627 | } | |
2628 | ||
d1310b2e CM |
2629 | static int submit_extent_page(int rw, struct extent_io_tree *tree, |
2630 | struct page *page, sector_t sector, | |
2631 | size_t size, unsigned long offset, | |
2632 | struct block_device *bdev, | |
2633 | struct bio **bio_ret, | |
2634 | unsigned long max_pages, | |
f188591e | 2635 | bio_end_io_t end_io_func, |
c8b97818 CM |
2636 | int mirror_num, |
2637 | unsigned long prev_bio_flags, | |
2638 | unsigned long bio_flags) | |
d1310b2e CM |
2639 | { |
2640 | int ret = 0; | |
2641 | struct bio *bio; | |
2642 | int nr; | |
c8b97818 CM |
2643 | int contig = 0; |
2644 | int this_compressed = bio_flags & EXTENT_BIO_COMPRESSED; | |
2645 | int old_compressed = prev_bio_flags & EXTENT_BIO_COMPRESSED; | |
5b050f04 | 2646 | size_t page_size = min_t(size_t, size, PAGE_CACHE_SIZE); |
d1310b2e CM |
2647 | |
2648 | if (bio_ret && *bio_ret) { | |
2649 | bio = *bio_ret; | |
c8b97818 CM |
2650 | if (old_compressed) |
2651 | contig = bio->bi_sector == sector; | |
2652 | else | |
f73a1c7d | 2653 | contig = bio_end_sector(bio) == sector; |
c8b97818 CM |
2654 | |
2655 | if (prev_bio_flags != bio_flags || !contig || | |
64a16701 | 2656 | merge_bio(rw, tree, page, offset, page_size, bio, bio_flags) || |
c8b97818 CM |
2657 | bio_add_page(bio, page, page_size, offset) < page_size) { |
2658 | ret = submit_one_bio(rw, bio, mirror_num, | |
2659 | prev_bio_flags); | |
79787eaa JM |
2660 | if (ret < 0) |
2661 | return ret; | |
d1310b2e CM |
2662 | bio = NULL; |
2663 | } else { | |
2664 | return 0; | |
2665 | } | |
2666 | } | |
c8b97818 CM |
2667 | if (this_compressed) |
2668 | nr = BIO_MAX_PAGES; | |
2669 | else | |
2670 | nr = bio_get_nr_vecs(bdev); | |
2671 | ||
88f794ed | 2672 | bio = btrfs_bio_alloc(bdev, sector, nr, GFP_NOFS | __GFP_HIGH); |
5df67083 TI |
2673 | if (!bio) |
2674 | return -ENOMEM; | |
70dec807 | 2675 | |
c8b97818 | 2676 | bio_add_page(bio, page, page_size, offset); |
d1310b2e CM |
2677 | bio->bi_end_io = end_io_func; |
2678 | bio->bi_private = tree; | |
70dec807 | 2679 | |
d397712b | 2680 | if (bio_ret) |
d1310b2e | 2681 | *bio_ret = bio; |
d397712b | 2682 | else |
c8b97818 | 2683 | ret = submit_one_bio(rw, bio, mirror_num, bio_flags); |
d1310b2e CM |
2684 | |
2685 | return ret; | |
2686 | } | |
2687 | ||
48a3b636 ES |
2688 | static void attach_extent_buffer_page(struct extent_buffer *eb, |
2689 | struct page *page) | |
d1310b2e CM |
2690 | { |
2691 | if (!PagePrivate(page)) { | |
2692 | SetPagePrivate(page); | |
d1310b2e | 2693 | page_cache_get(page); |
4f2de97a JB |
2694 | set_page_private(page, (unsigned long)eb); |
2695 | } else { | |
2696 | WARN_ON(page->private != (unsigned long)eb); | |
d1310b2e CM |
2697 | } |
2698 | } | |
2699 | ||
4f2de97a | 2700 | void set_page_extent_mapped(struct page *page) |
d1310b2e | 2701 | { |
4f2de97a JB |
2702 | if (!PagePrivate(page)) { |
2703 | SetPagePrivate(page); | |
2704 | page_cache_get(page); | |
2705 | set_page_private(page, EXTENT_PAGE_PRIVATE); | |
2706 | } | |
d1310b2e CM |
2707 | } |
2708 | ||
125bac01 MX |
2709 | static struct extent_map * |
2710 | __get_extent_map(struct inode *inode, struct page *page, size_t pg_offset, | |
2711 | u64 start, u64 len, get_extent_t *get_extent, | |
2712 | struct extent_map **em_cached) | |
2713 | { | |
2714 | struct extent_map *em; | |
2715 | ||
2716 | if (em_cached && *em_cached) { | |
2717 | em = *em_cached; | |
2718 | if (em->in_tree && start >= em->start && | |
2719 | start < extent_map_end(em)) { | |
2720 | atomic_inc(&em->refs); | |
2721 | return em; | |
2722 | } | |
2723 | ||
2724 | free_extent_map(em); | |
2725 | *em_cached = NULL; | |
2726 | } | |
2727 | ||
2728 | em = get_extent(inode, page, pg_offset, start, len, 0); | |
2729 | if (em_cached && !IS_ERR_OR_NULL(em)) { | |
2730 | BUG_ON(*em_cached); | |
2731 | atomic_inc(&em->refs); | |
2732 | *em_cached = em; | |
2733 | } | |
2734 | return em; | |
2735 | } | |
d1310b2e CM |
2736 | /* |
2737 | * basic readpage implementation. Locked extent state structs are inserted | |
2738 | * into the tree that are removed when the IO is done (by the end_io | |
2739 | * handlers) | |
79787eaa | 2740 | * XXX JDM: This needs looking at to ensure proper page locking |
d1310b2e | 2741 | */ |
9974090b MX |
2742 | static int __do_readpage(struct extent_io_tree *tree, |
2743 | struct page *page, | |
2744 | get_extent_t *get_extent, | |
125bac01 | 2745 | struct extent_map **em_cached, |
9974090b MX |
2746 | struct bio **bio, int mirror_num, |
2747 | unsigned long *bio_flags, int rw) | |
d1310b2e CM |
2748 | { |
2749 | struct inode *inode = page->mapping->host; | |
4eee4fa4 | 2750 | u64 start = page_offset(page); |
d1310b2e CM |
2751 | u64 page_end = start + PAGE_CACHE_SIZE - 1; |
2752 | u64 end; | |
2753 | u64 cur = start; | |
2754 | u64 extent_offset; | |
2755 | u64 last_byte = i_size_read(inode); | |
2756 | u64 block_start; | |
2757 | u64 cur_end; | |
2758 | sector_t sector; | |
2759 | struct extent_map *em; | |
2760 | struct block_device *bdev; | |
2761 | int ret; | |
2762 | int nr = 0; | |
4b384318 | 2763 | int parent_locked = *bio_flags & EXTENT_BIO_PARENT_LOCKED; |
306e16ce | 2764 | size_t pg_offset = 0; |
d1310b2e | 2765 | size_t iosize; |
c8b97818 | 2766 | size_t disk_io_size; |
d1310b2e | 2767 | size_t blocksize = inode->i_sb->s_blocksize; |
4b384318 | 2768 | unsigned long this_bio_flag = *bio_flags & EXTENT_BIO_PARENT_LOCKED; |
d1310b2e CM |
2769 | |
2770 | set_page_extent_mapped(page); | |
2771 | ||
9974090b | 2772 | end = page_end; |
90a887c9 DM |
2773 | if (!PageUptodate(page)) { |
2774 | if (cleancache_get_page(page) == 0) { | |
2775 | BUG_ON(blocksize != PAGE_SIZE); | |
9974090b | 2776 | unlock_extent(tree, start, end); |
90a887c9 DM |
2777 | goto out; |
2778 | } | |
2779 | } | |
2780 | ||
c8b97818 CM |
2781 | if (page->index == last_byte >> PAGE_CACHE_SHIFT) { |
2782 | char *userpage; | |
2783 | size_t zero_offset = last_byte & (PAGE_CACHE_SIZE - 1); | |
2784 | ||
2785 | if (zero_offset) { | |
2786 | iosize = PAGE_CACHE_SIZE - zero_offset; | |
7ac687d9 | 2787 | userpage = kmap_atomic(page); |
c8b97818 CM |
2788 | memset(userpage + zero_offset, 0, iosize); |
2789 | flush_dcache_page(page); | |
7ac687d9 | 2790 | kunmap_atomic(userpage); |
c8b97818 CM |
2791 | } |
2792 | } | |
d1310b2e | 2793 | while (cur <= end) { |
c8f2f24b JB |
2794 | unsigned long pnr = (last_byte >> PAGE_CACHE_SHIFT) + 1; |
2795 | ||
d1310b2e CM |
2796 | if (cur >= last_byte) { |
2797 | char *userpage; | |
507903b8 AJ |
2798 | struct extent_state *cached = NULL; |
2799 | ||
306e16ce | 2800 | iosize = PAGE_CACHE_SIZE - pg_offset; |
7ac687d9 | 2801 | userpage = kmap_atomic(page); |
306e16ce | 2802 | memset(userpage + pg_offset, 0, iosize); |
d1310b2e | 2803 | flush_dcache_page(page); |
7ac687d9 | 2804 | kunmap_atomic(userpage); |
d1310b2e | 2805 | set_extent_uptodate(tree, cur, cur + iosize - 1, |
507903b8 | 2806 | &cached, GFP_NOFS); |
4b384318 MF |
2807 | if (!parent_locked) |
2808 | unlock_extent_cached(tree, cur, | |
2809 | cur + iosize - 1, | |
2810 | &cached, GFP_NOFS); | |
d1310b2e CM |
2811 | break; |
2812 | } | |
125bac01 MX |
2813 | em = __get_extent_map(inode, page, pg_offset, cur, |
2814 | end - cur + 1, get_extent, em_cached); | |
c704005d | 2815 | if (IS_ERR_OR_NULL(em)) { |
d1310b2e | 2816 | SetPageError(page); |
4b384318 MF |
2817 | if (!parent_locked) |
2818 | unlock_extent(tree, cur, end); | |
d1310b2e CM |
2819 | break; |
2820 | } | |
d1310b2e CM |
2821 | extent_offset = cur - em->start; |
2822 | BUG_ON(extent_map_end(em) <= cur); | |
2823 | BUG_ON(end < cur); | |
2824 | ||
261507a0 | 2825 | if (test_bit(EXTENT_FLAG_COMPRESSED, &em->flags)) { |
4b384318 | 2826 | this_bio_flag |= EXTENT_BIO_COMPRESSED; |
261507a0 LZ |
2827 | extent_set_compress_type(&this_bio_flag, |
2828 | em->compress_type); | |
2829 | } | |
c8b97818 | 2830 | |
d1310b2e CM |
2831 | iosize = min(extent_map_end(em) - cur, end - cur + 1); |
2832 | cur_end = min(extent_map_end(em) - 1, end); | |
fda2832f | 2833 | iosize = ALIGN(iosize, blocksize); |
c8b97818 CM |
2834 | if (this_bio_flag & EXTENT_BIO_COMPRESSED) { |
2835 | disk_io_size = em->block_len; | |
2836 | sector = em->block_start >> 9; | |
2837 | } else { | |
2838 | sector = (em->block_start + extent_offset) >> 9; | |
2839 | disk_io_size = iosize; | |
2840 | } | |
d1310b2e CM |
2841 | bdev = em->bdev; |
2842 | block_start = em->block_start; | |
d899e052 YZ |
2843 | if (test_bit(EXTENT_FLAG_PREALLOC, &em->flags)) |
2844 | block_start = EXTENT_MAP_HOLE; | |
d1310b2e CM |
2845 | free_extent_map(em); |
2846 | em = NULL; | |
2847 | ||
2848 | /* we've found a hole, just zero and go on */ | |
2849 | if (block_start == EXTENT_MAP_HOLE) { | |
2850 | char *userpage; | |
507903b8 AJ |
2851 | struct extent_state *cached = NULL; |
2852 | ||
7ac687d9 | 2853 | userpage = kmap_atomic(page); |
306e16ce | 2854 | memset(userpage + pg_offset, 0, iosize); |
d1310b2e | 2855 | flush_dcache_page(page); |
7ac687d9 | 2856 | kunmap_atomic(userpage); |
d1310b2e CM |
2857 | |
2858 | set_extent_uptodate(tree, cur, cur + iosize - 1, | |
507903b8 AJ |
2859 | &cached, GFP_NOFS); |
2860 | unlock_extent_cached(tree, cur, cur + iosize - 1, | |
2861 | &cached, GFP_NOFS); | |
d1310b2e | 2862 | cur = cur + iosize; |
306e16ce | 2863 | pg_offset += iosize; |
d1310b2e CM |
2864 | continue; |
2865 | } | |
2866 | /* the get_extent function already copied into the page */ | |
9655d298 CM |
2867 | if (test_range_bit(tree, cur, cur_end, |
2868 | EXTENT_UPTODATE, 1, NULL)) { | |
a1b32a59 | 2869 | check_page_uptodate(tree, page); |
4b384318 MF |
2870 | if (!parent_locked) |
2871 | unlock_extent(tree, cur, cur + iosize - 1); | |
d1310b2e | 2872 | cur = cur + iosize; |
306e16ce | 2873 | pg_offset += iosize; |
d1310b2e CM |
2874 | continue; |
2875 | } | |
70dec807 CM |
2876 | /* we have an inline extent but it didn't get marked up |
2877 | * to date. Error out | |
2878 | */ | |
2879 | if (block_start == EXTENT_MAP_INLINE) { | |
2880 | SetPageError(page); | |
4b384318 MF |
2881 | if (!parent_locked) |
2882 | unlock_extent(tree, cur, cur + iosize - 1); | |
70dec807 | 2883 | cur = cur + iosize; |
306e16ce | 2884 | pg_offset += iosize; |
70dec807 CM |
2885 | continue; |
2886 | } | |
d1310b2e | 2887 | |
c8f2f24b | 2888 | pnr -= page->index; |
d4c7ca86 | 2889 | ret = submit_extent_page(rw, tree, page, |
306e16ce | 2890 | sector, disk_io_size, pg_offset, |
89642229 | 2891 | bdev, bio, pnr, |
c8b97818 CM |
2892 | end_bio_extent_readpage, mirror_num, |
2893 | *bio_flags, | |
2894 | this_bio_flag); | |
c8f2f24b JB |
2895 | if (!ret) { |
2896 | nr++; | |
2897 | *bio_flags = this_bio_flag; | |
2898 | } else { | |
d1310b2e | 2899 | SetPageError(page); |
4b384318 MF |
2900 | if (!parent_locked) |
2901 | unlock_extent(tree, cur, cur + iosize - 1); | |
edd33c99 | 2902 | } |
d1310b2e | 2903 | cur = cur + iosize; |
306e16ce | 2904 | pg_offset += iosize; |
d1310b2e | 2905 | } |
90a887c9 | 2906 | out: |
d1310b2e CM |
2907 | if (!nr) { |
2908 | if (!PageError(page)) | |
2909 | SetPageUptodate(page); | |
2910 | unlock_page(page); | |
2911 | } | |
2912 | return 0; | |
2913 | } | |
2914 | ||
9974090b MX |
2915 | static inline void __do_contiguous_readpages(struct extent_io_tree *tree, |
2916 | struct page *pages[], int nr_pages, | |
2917 | u64 start, u64 end, | |
2918 | get_extent_t *get_extent, | |
125bac01 | 2919 | struct extent_map **em_cached, |
9974090b MX |
2920 | struct bio **bio, int mirror_num, |
2921 | unsigned long *bio_flags, int rw) | |
2922 | { | |
2923 | struct inode *inode; | |
2924 | struct btrfs_ordered_extent *ordered; | |
2925 | int index; | |
2926 | ||
2927 | inode = pages[0]->mapping->host; | |
2928 | while (1) { | |
2929 | lock_extent(tree, start, end); | |
2930 | ordered = btrfs_lookup_ordered_range(inode, start, | |
2931 | end - start + 1); | |
2932 | if (!ordered) | |
2933 | break; | |
2934 | unlock_extent(tree, start, end); | |
2935 | btrfs_start_ordered_extent(inode, ordered, 1); | |
2936 | btrfs_put_ordered_extent(ordered); | |
2937 | } | |
2938 | ||
2939 | for (index = 0; index < nr_pages; index++) { | |
125bac01 MX |
2940 | __do_readpage(tree, pages[index], get_extent, em_cached, bio, |
2941 | mirror_num, bio_flags, rw); | |
9974090b MX |
2942 | page_cache_release(pages[index]); |
2943 | } | |
2944 | } | |
2945 | ||
2946 | static void __extent_readpages(struct extent_io_tree *tree, | |
2947 | struct page *pages[], | |
2948 | int nr_pages, get_extent_t *get_extent, | |
125bac01 | 2949 | struct extent_map **em_cached, |
9974090b MX |
2950 | struct bio **bio, int mirror_num, |
2951 | unsigned long *bio_flags, int rw) | |
2952 | { | |
35a3621b | 2953 | u64 start = 0; |
9974090b MX |
2954 | u64 end = 0; |
2955 | u64 page_start; | |
2956 | int index; | |
35a3621b | 2957 | int first_index = 0; |
9974090b MX |
2958 | |
2959 | for (index = 0; index < nr_pages; index++) { | |
2960 | page_start = page_offset(pages[index]); | |
2961 | if (!end) { | |
2962 | start = page_start; | |
2963 | end = start + PAGE_CACHE_SIZE - 1; | |
2964 | first_index = index; | |
2965 | } else if (end + 1 == page_start) { | |
2966 | end += PAGE_CACHE_SIZE; | |
2967 | } else { | |
2968 | __do_contiguous_readpages(tree, &pages[first_index], | |
2969 | index - first_index, start, | |
125bac01 MX |
2970 | end, get_extent, em_cached, |
2971 | bio, mirror_num, bio_flags, | |
2972 | rw); | |
9974090b MX |
2973 | start = page_start; |
2974 | end = start + PAGE_CACHE_SIZE - 1; | |
2975 | first_index = index; | |
2976 | } | |
2977 | } | |
2978 | ||
2979 | if (end) | |
2980 | __do_contiguous_readpages(tree, &pages[first_index], | |
2981 | index - first_index, start, | |
125bac01 | 2982 | end, get_extent, em_cached, bio, |
9974090b MX |
2983 | mirror_num, bio_flags, rw); |
2984 | } | |
2985 | ||
2986 | static int __extent_read_full_page(struct extent_io_tree *tree, | |
2987 | struct page *page, | |
2988 | get_extent_t *get_extent, | |
2989 | struct bio **bio, int mirror_num, | |
2990 | unsigned long *bio_flags, int rw) | |
2991 | { | |
2992 | struct inode *inode = page->mapping->host; | |
2993 | struct btrfs_ordered_extent *ordered; | |
2994 | u64 start = page_offset(page); | |
2995 | u64 end = start + PAGE_CACHE_SIZE - 1; | |
2996 | int ret; | |
2997 | ||
2998 | while (1) { | |
2999 | lock_extent(tree, start, end); | |
3000 | ordered = btrfs_lookup_ordered_extent(inode, start); | |
3001 | if (!ordered) | |
3002 | break; | |
3003 | unlock_extent(tree, start, end); | |
3004 | btrfs_start_ordered_extent(inode, ordered, 1); | |
3005 | btrfs_put_ordered_extent(ordered); | |
3006 | } | |
3007 | ||
125bac01 MX |
3008 | ret = __do_readpage(tree, page, get_extent, NULL, bio, mirror_num, |
3009 | bio_flags, rw); | |
9974090b MX |
3010 | return ret; |
3011 | } | |
3012 | ||
d1310b2e | 3013 | int extent_read_full_page(struct extent_io_tree *tree, struct page *page, |
8ddc7d9c | 3014 | get_extent_t *get_extent, int mirror_num) |
d1310b2e CM |
3015 | { |
3016 | struct bio *bio = NULL; | |
c8b97818 | 3017 | unsigned long bio_flags = 0; |
d1310b2e CM |
3018 | int ret; |
3019 | ||
8ddc7d9c | 3020 | ret = __extent_read_full_page(tree, page, get_extent, &bio, mirror_num, |
d4c7ca86 | 3021 | &bio_flags, READ); |
d1310b2e | 3022 | if (bio) |
8ddc7d9c | 3023 | ret = submit_one_bio(READ, bio, mirror_num, bio_flags); |
d1310b2e CM |
3024 | return ret; |
3025 | } | |
d1310b2e | 3026 | |
4b384318 MF |
3027 | int extent_read_full_page_nolock(struct extent_io_tree *tree, struct page *page, |
3028 | get_extent_t *get_extent, int mirror_num) | |
3029 | { | |
3030 | struct bio *bio = NULL; | |
3031 | unsigned long bio_flags = EXTENT_BIO_PARENT_LOCKED; | |
3032 | int ret; | |
3033 | ||
3034 | ret = __do_readpage(tree, page, get_extent, NULL, &bio, mirror_num, | |
3035 | &bio_flags, READ); | |
3036 | if (bio) | |
3037 | ret = submit_one_bio(READ, bio, mirror_num, bio_flags); | |
3038 | return ret; | |
3039 | } | |
3040 | ||
11c8349b CM |
3041 | static noinline void update_nr_written(struct page *page, |
3042 | struct writeback_control *wbc, | |
3043 | unsigned long nr_written) | |
3044 | { | |
3045 | wbc->nr_to_write -= nr_written; | |
3046 | if (wbc->range_cyclic || (wbc->nr_to_write > 0 && | |
3047 | wbc->range_start == 0 && wbc->range_end == LLONG_MAX)) | |
3048 | page->mapping->writeback_index = page->index + nr_written; | |
3049 | } | |
3050 | ||
d1310b2e CM |
3051 | /* |
3052 | * the writepage semantics are similar to regular writepage. extent | |
3053 | * records are inserted to lock ranges in the tree, and as dirty areas | |
3054 | * are found, they are marked writeback. Then the lock bits are removed | |
3055 | * and the end_io handler clears the writeback ranges | |
3056 | */ | |
3057 | static int __extent_writepage(struct page *page, struct writeback_control *wbc, | |
3058 | void *data) | |
3059 | { | |
3060 | struct inode *inode = page->mapping->host; | |
3061 | struct extent_page_data *epd = data; | |
3062 | struct extent_io_tree *tree = epd->tree; | |
4eee4fa4 | 3063 | u64 start = page_offset(page); |
d1310b2e CM |
3064 | u64 delalloc_start; |
3065 | u64 page_end = start + PAGE_CACHE_SIZE - 1; | |
3066 | u64 end; | |
3067 | u64 cur = start; | |
3068 | u64 extent_offset; | |
3069 | u64 last_byte = i_size_read(inode); | |
3070 | u64 block_start; | |
3071 | u64 iosize; | |
3072 | sector_t sector; | |
2c64c53d | 3073 | struct extent_state *cached_state = NULL; |
d1310b2e CM |
3074 | struct extent_map *em; |
3075 | struct block_device *bdev; | |
3076 | int ret; | |
3077 | int nr = 0; | |
7f3c74fb | 3078 | size_t pg_offset = 0; |
d1310b2e CM |
3079 | size_t blocksize; |
3080 | loff_t i_size = i_size_read(inode); | |
3081 | unsigned long end_index = i_size >> PAGE_CACHE_SHIFT; | |
3082 | u64 nr_delalloc; | |
3083 | u64 delalloc_end; | |
c8b97818 CM |
3084 | int page_started; |
3085 | int compressed; | |
ffbd517d | 3086 | int write_flags; |
771ed689 | 3087 | unsigned long nr_written = 0; |
9e487107 | 3088 | bool fill_delalloc = true; |
d1310b2e | 3089 | |
ffbd517d | 3090 | if (wbc->sync_mode == WB_SYNC_ALL) |
721a9602 | 3091 | write_flags = WRITE_SYNC; |
ffbd517d CM |
3092 | else |
3093 | write_flags = WRITE; | |
3094 | ||
1abe9b8a | 3095 | trace___extent_writepage(page, inode, wbc); |
3096 | ||
d1310b2e | 3097 | WARN_ON(!PageLocked(page)); |
bf0da8c1 CM |
3098 | |
3099 | ClearPageError(page); | |
3100 | ||
7f3c74fb | 3101 | pg_offset = i_size & (PAGE_CACHE_SIZE - 1); |
211c17f5 | 3102 | if (page->index > end_index || |
7f3c74fb | 3103 | (page->index == end_index && !pg_offset)) { |
d47992f8 | 3104 | page->mapping->a_ops->invalidatepage(page, 0, PAGE_CACHE_SIZE); |
d1310b2e CM |
3105 | unlock_page(page); |
3106 | return 0; | |
3107 | } | |
3108 | ||
3109 | if (page->index == end_index) { | |
3110 | char *userpage; | |
3111 | ||
7ac687d9 | 3112 | userpage = kmap_atomic(page); |
7f3c74fb CM |
3113 | memset(userpage + pg_offset, 0, |
3114 | PAGE_CACHE_SIZE - pg_offset); | |
7ac687d9 | 3115 | kunmap_atomic(userpage); |
211c17f5 | 3116 | flush_dcache_page(page); |
d1310b2e | 3117 | } |
7f3c74fb | 3118 | pg_offset = 0; |
d1310b2e CM |
3119 | |
3120 | set_page_extent_mapped(page); | |
3121 | ||
9e487107 JB |
3122 | if (!tree->ops || !tree->ops->fill_delalloc) |
3123 | fill_delalloc = false; | |
3124 | ||
d1310b2e CM |
3125 | delalloc_start = start; |
3126 | delalloc_end = 0; | |
c8b97818 | 3127 | page_started = 0; |
9e487107 | 3128 | if (!epd->extent_locked && fill_delalloc) { |
f85d7d6c | 3129 | u64 delalloc_to_write = 0; |
11c8349b CM |
3130 | /* |
3131 | * make sure the wbc mapping index is at least updated | |
3132 | * to this page. | |
3133 | */ | |
3134 | update_nr_written(page, wbc, 0); | |
3135 | ||
d397712b | 3136 | while (delalloc_end < page_end) { |
771ed689 | 3137 | nr_delalloc = find_lock_delalloc_range(inode, tree, |
c8b97818 CM |
3138 | page, |
3139 | &delalloc_start, | |
d1310b2e CM |
3140 | &delalloc_end, |
3141 | 128 * 1024 * 1024); | |
771ed689 CM |
3142 | if (nr_delalloc == 0) { |
3143 | delalloc_start = delalloc_end + 1; | |
3144 | continue; | |
3145 | } | |
013bd4c3 TI |
3146 | ret = tree->ops->fill_delalloc(inode, page, |
3147 | delalloc_start, | |
3148 | delalloc_end, | |
3149 | &page_started, | |
3150 | &nr_written); | |
79787eaa JM |
3151 | /* File system has been set read-only */ |
3152 | if (ret) { | |
3153 | SetPageError(page); | |
3154 | goto done; | |
3155 | } | |
f85d7d6c CM |
3156 | /* |
3157 | * delalloc_end is already one less than the total | |
3158 | * length, so we don't subtract one from | |
3159 | * PAGE_CACHE_SIZE | |
3160 | */ | |
3161 | delalloc_to_write += (delalloc_end - delalloc_start + | |
3162 | PAGE_CACHE_SIZE) >> | |
3163 | PAGE_CACHE_SHIFT; | |
d1310b2e | 3164 | delalloc_start = delalloc_end + 1; |
d1310b2e | 3165 | } |
f85d7d6c CM |
3166 | if (wbc->nr_to_write < delalloc_to_write) { |
3167 | int thresh = 8192; | |
3168 | ||
3169 | if (delalloc_to_write < thresh * 2) | |
3170 | thresh = delalloc_to_write; | |
3171 | wbc->nr_to_write = min_t(u64, delalloc_to_write, | |
3172 | thresh); | |
3173 | } | |
c8b97818 | 3174 | |
771ed689 CM |
3175 | /* did the fill delalloc function already unlock and start |
3176 | * the IO? | |
3177 | */ | |
3178 | if (page_started) { | |
3179 | ret = 0; | |
11c8349b CM |
3180 | /* |
3181 | * we've unlocked the page, so we can't update | |
3182 | * the mapping's writeback index, just update | |
3183 | * nr_to_write. | |
3184 | */ | |
3185 | wbc->nr_to_write -= nr_written; | |
3186 | goto done_unlocked; | |
771ed689 | 3187 | } |
c8b97818 | 3188 | } |
247e743c | 3189 | if (tree->ops && tree->ops->writepage_start_hook) { |
c8b97818 CM |
3190 | ret = tree->ops->writepage_start_hook(page, start, |
3191 | page_end); | |
87826df0 JM |
3192 | if (ret) { |
3193 | /* Fixup worker will requeue */ | |
3194 | if (ret == -EBUSY) | |
3195 | wbc->pages_skipped++; | |
3196 | else | |
3197 | redirty_page_for_writepage(wbc, page); | |
11c8349b | 3198 | update_nr_written(page, wbc, nr_written); |
247e743c | 3199 | unlock_page(page); |
771ed689 | 3200 | ret = 0; |
11c8349b | 3201 | goto done_unlocked; |
247e743c CM |
3202 | } |
3203 | } | |
3204 | ||
11c8349b CM |
3205 | /* |
3206 | * we don't want to touch the inode after unlocking the page, | |
3207 | * so we update the mapping writeback index now | |
3208 | */ | |
3209 | update_nr_written(page, wbc, nr_written + 1); | |
771ed689 | 3210 | |
d1310b2e | 3211 | end = page_end; |
d1310b2e | 3212 | if (last_byte <= start) { |
e6dcd2dc CM |
3213 | if (tree->ops && tree->ops->writepage_end_io_hook) |
3214 | tree->ops->writepage_end_io_hook(page, start, | |
3215 | page_end, NULL, 1); | |
d1310b2e CM |
3216 | goto done; |
3217 | } | |
3218 | ||
d1310b2e CM |
3219 | blocksize = inode->i_sb->s_blocksize; |
3220 | ||
3221 | while (cur <= end) { | |
3222 | if (cur >= last_byte) { | |
e6dcd2dc CM |
3223 | if (tree->ops && tree->ops->writepage_end_io_hook) |
3224 | tree->ops->writepage_end_io_hook(page, cur, | |
3225 | page_end, NULL, 1); | |
d1310b2e CM |
3226 | break; |
3227 | } | |
7f3c74fb | 3228 | em = epd->get_extent(inode, page, pg_offset, cur, |
d1310b2e | 3229 | end - cur + 1, 1); |
c704005d | 3230 | if (IS_ERR_OR_NULL(em)) { |
d1310b2e CM |
3231 | SetPageError(page); |
3232 | break; | |
3233 | } | |
3234 | ||
3235 | extent_offset = cur - em->start; | |
3236 | BUG_ON(extent_map_end(em) <= cur); | |
3237 | BUG_ON(end < cur); | |
3238 | iosize = min(extent_map_end(em) - cur, end - cur + 1); | |
fda2832f | 3239 | iosize = ALIGN(iosize, blocksize); |
d1310b2e CM |
3240 | sector = (em->block_start + extent_offset) >> 9; |
3241 | bdev = em->bdev; | |
3242 | block_start = em->block_start; | |
c8b97818 | 3243 | compressed = test_bit(EXTENT_FLAG_COMPRESSED, &em->flags); |
d1310b2e CM |
3244 | free_extent_map(em); |
3245 | em = NULL; | |
3246 | ||
c8b97818 CM |
3247 | /* |
3248 | * compressed and inline extents are written through other | |
3249 | * paths in the FS | |
3250 | */ | |
3251 | if (compressed || block_start == EXTENT_MAP_HOLE || | |
d1310b2e | 3252 | block_start == EXTENT_MAP_INLINE) { |
c8b97818 CM |
3253 | /* |
3254 | * end_io notification does not happen here for | |
3255 | * compressed extents | |
3256 | */ | |
3257 | if (!compressed && tree->ops && | |
3258 | tree->ops->writepage_end_io_hook) | |
e6dcd2dc CM |
3259 | tree->ops->writepage_end_io_hook(page, cur, |
3260 | cur + iosize - 1, | |
3261 | NULL, 1); | |
c8b97818 CM |
3262 | else if (compressed) { |
3263 | /* we don't want to end_page_writeback on | |
3264 | * a compressed extent. this happens | |
3265 | * elsewhere | |
3266 | */ | |
3267 | nr++; | |
3268 | } | |
3269 | ||
3270 | cur += iosize; | |
7f3c74fb | 3271 | pg_offset += iosize; |
d1310b2e CM |
3272 | continue; |
3273 | } | |
d1310b2e CM |
3274 | /* leave this out until we have a page_mkwrite call */ |
3275 | if (0 && !test_range_bit(tree, cur, cur + iosize - 1, | |
9655d298 | 3276 | EXTENT_DIRTY, 0, NULL)) { |
d1310b2e | 3277 | cur = cur + iosize; |
7f3c74fb | 3278 | pg_offset += iosize; |
d1310b2e CM |
3279 | continue; |
3280 | } | |
c8b97818 | 3281 | |
d1310b2e CM |
3282 | if (tree->ops && tree->ops->writepage_io_hook) { |
3283 | ret = tree->ops->writepage_io_hook(page, cur, | |
3284 | cur + iosize - 1); | |
3285 | } else { | |
3286 | ret = 0; | |
3287 | } | |
1259ab75 | 3288 | if (ret) { |
d1310b2e | 3289 | SetPageError(page); |
1259ab75 | 3290 | } else { |
d1310b2e | 3291 | unsigned long max_nr = end_index + 1; |
7f3c74fb | 3292 | |
d1310b2e CM |
3293 | set_range_writeback(tree, cur, cur + iosize - 1); |
3294 | if (!PageWriteback(page)) { | |
d397712b CM |
3295 | printk(KERN_ERR "btrfs warning page %lu not " |
3296 | "writeback, cur %llu end %llu\n", | |
c1c9ff7c | 3297 | page->index, cur, end); |
d1310b2e CM |
3298 | } |
3299 | ||
ffbd517d CM |
3300 | ret = submit_extent_page(write_flags, tree, page, |
3301 | sector, iosize, pg_offset, | |
3302 | bdev, &epd->bio, max_nr, | |
c8b97818 CM |
3303 | end_bio_extent_writepage, |
3304 | 0, 0, 0); | |
d1310b2e CM |
3305 | if (ret) |
3306 | SetPageError(page); | |
3307 | } | |
3308 | cur = cur + iosize; | |
7f3c74fb | 3309 | pg_offset += iosize; |
d1310b2e CM |
3310 | nr++; |
3311 | } | |
3312 | done: | |
3313 | if (nr == 0) { | |
3314 | /* make sure the mapping tag for page dirty gets cleared */ | |
3315 | set_page_writeback(page); | |
3316 | end_page_writeback(page); | |
3317 | } | |
d1310b2e | 3318 | unlock_page(page); |
771ed689 | 3319 | |
11c8349b CM |
3320 | done_unlocked: |
3321 | ||
2c64c53d CM |
3322 | /* drop our reference on any cached states */ |
3323 | free_extent_state(cached_state); | |
d1310b2e CM |
3324 | return 0; |
3325 | } | |
3326 | ||
0b32f4bb JB |
3327 | static int eb_wait(void *word) |
3328 | { | |
3329 | io_schedule(); | |
3330 | return 0; | |
3331 | } | |
3332 | ||
fd8b2b61 | 3333 | void wait_on_extent_buffer_writeback(struct extent_buffer *eb) |
0b32f4bb JB |
3334 | { |
3335 | wait_on_bit(&eb->bflags, EXTENT_BUFFER_WRITEBACK, eb_wait, | |
3336 | TASK_UNINTERRUPTIBLE); | |
3337 | } | |
3338 | ||
3339 | static int lock_extent_buffer_for_io(struct extent_buffer *eb, | |
3340 | struct btrfs_fs_info *fs_info, | |
3341 | struct extent_page_data *epd) | |
3342 | { | |
3343 | unsigned long i, num_pages; | |
3344 | int flush = 0; | |
3345 | int ret = 0; | |
3346 | ||
3347 | if (!btrfs_try_tree_write_lock(eb)) { | |
3348 | flush = 1; | |
3349 | flush_write_bio(epd); | |
3350 | btrfs_tree_lock(eb); | |
3351 | } | |
3352 | ||
3353 | if (test_bit(EXTENT_BUFFER_WRITEBACK, &eb->bflags)) { | |
3354 | btrfs_tree_unlock(eb); | |
3355 | if (!epd->sync_io) | |
3356 | return 0; | |
3357 | if (!flush) { | |
3358 | flush_write_bio(epd); | |
3359 | flush = 1; | |
3360 | } | |
a098d8e8 CM |
3361 | while (1) { |
3362 | wait_on_extent_buffer_writeback(eb); | |
3363 | btrfs_tree_lock(eb); | |
3364 | if (!test_bit(EXTENT_BUFFER_WRITEBACK, &eb->bflags)) | |
3365 | break; | |
0b32f4bb | 3366 | btrfs_tree_unlock(eb); |
0b32f4bb JB |
3367 | } |
3368 | } | |
3369 | ||
51561ffe JB |
3370 | /* |
3371 | * We need to do this to prevent races in people who check if the eb is | |
3372 | * under IO since we can end up having no IO bits set for a short period | |
3373 | * of time. | |
3374 | */ | |
3375 | spin_lock(&eb->refs_lock); | |
0b32f4bb JB |
3376 | if (test_and_clear_bit(EXTENT_BUFFER_DIRTY, &eb->bflags)) { |
3377 | set_bit(EXTENT_BUFFER_WRITEBACK, &eb->bflags); | |
51561ffe | 3378 | spin_unlock(&eb->refs_lock); |
0b32f4bb | 3379 | btrfs_set_header_flag(eb, BTRFS_HEADER_FLAG_WRITTEN); |
e2d84521 MX |
3380 | __percpu_counter_add(&fs_info->dirty_metadata_bytes, |
3381 | -eb->len, | |
3382 | fs_info->dirty_metadata_batch); | |
0b32f4bb | 3383 | ret = 1; |
51561ffe JB |
3384 | } else { |
3385 | spin_unlock(&eb->refs_lock); | |
0b32f4bb JB |
3386 | } |
3387 | ||
3388 | btrfs_tree_unlock(eb); | |
3389 | ||
3390 | if (!ret) | |
3391 | return ret; | |
3392 | ||
3393 | num_pages = num_extent_pages(eb->start, eb->len); | |
3394 | for (i = 0; i < num_pages; i++) { | |
3395 | struct page *p = extent_buffer_page(eb, i); | |
3396 | ||
3397 | if (!trylock_page(p)) { | |
3398 | if (!flush) { | |
3399 | flush_write_bio(epd); | |
3400 | flush = 1; | |
3401 | } | |
3402 | lock_page(p); | |
3403 | } | |
3404 | } | |
3405 | ||
3406 | return ret; | |
3407 | } | |
3408 | ||
3409 | static void end_extent_buffer_writeback(struct extent_buffer *eb) | |
3410 | { | |
3411 | clear_bit(EXTENT_BUFFER_WRITEBACK, &eb->bflags); | |
3412 | smp_mb__after_clear_bit(); | |
3413 | wake_up_bit(&eb->bflags, EXTENT_BUFFER_WRITEBACK); | |
3414 | } | |
3415 | ||
3416 | static void end_bio_extent_buffer_writepage(struct bio *bio, int err) | |
3417 | { | |
3418 | int uptodate = err == 0; | |
3419 | struct bio_vec *bvec = bio->bi_io_vec + bio->bi_vcnt - 1; | |
3420 | struct extent_buffer *eb; | |
3421 | int done; | |
3422 | ||
3423 | do { | |
3424 | struct page *page = bvec->bv_page; | |
3425 | ||
3426 | bvec--; | |
3427 | eb = (struct extent_buffer *)page->private; | |
3428 | BUG_ON(!eb); | |
3429 | done = atomic_dec_and_test(&eb->io_pages); | |
3430 | ||
3431 | if (!uptodate || test_bit(EXTENT_BUFFER_IOERR, &eb->bflags)) { | |
3432 | set_bit(EXTENT_BUFFER_IOERR, &eb->bflags); | |
3433 | ClearPageUptodate(page); | |
3434 | SetPageError(page); | |
3435 | } | |
3436 | ||
3437 | end_page_writeback(page); | |
3438 | ||
3439 | if (!done) | |
3440 | continue; | |
3441 | ||
3442 | end_extent_buffer_writeback(eb); | |
3443 | } while (bvec >= bio->bi_io_vec); | |
3444 | ||
3445 | bio_put(bio); | |
3446 | ||
3447 | } | |
3448 | ||
3449 | static int write_one_eb(struct extent_buffer *eb, | |
3450 | struct btrfs_fs_info *fs_info, | |
3451 | struct writeback_control *wbc, | |
3452 | struct extent_page_data *epd) | |
3453 | { | |
3454 | struct block_device *bdev = fs_info->fs_devices->latest_bdev; | |
3455 | u64 offset = eb->start; | |
3456 | unsigned long i, num_pages; | |
de0022b9 | 3457 | unsigned long bio_flags = 0; |
d4c7ca86 | 3458 | int rw = (epd->sync_io ? WRITE_SYNC : WRITE) | REQ_META; |
d7dbe9e7 | 3459 | int ret = 0; |
0b32f4bb JB |
3460 | |
3461 | clear_bit(EXTENT_BUFFER_IOERR, &eb->bflags); | |
3462 | num_pages = num_extent_pages(eb->start, eb->len); | |
3463 | atomic_set(&eb->io_pages, num_pages); | |
de0022b9 JB |
3464 | if (btrfs_header_owner(eb) == BTRFS_TREE_LOG_OBJECTID) |
3465 | bio_flags = EXTENT_BIO_TREE_LOG; | |
3466 | ||
0b32f4bb JB |
3467 | for (i = 0; i < num_pages; i++) { |
3468 | struct page *p = extent_buffer_page(eb, i); | |
3469 | ||
3470 | clear_page_dirty_for_io(p); | |
3471 | set_page_writeback(p); | |
3472 | ret = submit_extent_page(rw, eb->tree, p, offset >> 9, | |
3473 | PAGE_CACHE_SIZE, 0, bdev, &epd->bio, | |
3474 | -1, end_bio_extent_buffer_writepage, | |
de0022b9 JB |
3475 | 0, epd->bio_flags, bio_flags); |
3476 | epd->bio_flags = bio_flags; | |
0b32f4bb JB |
3477 | if (ret) { |
3478 | set_bit(EXTENT_BUFFER_IOERR, &eb->bflags); | |
3479 | SetPageError(p); | |
3480 | if (atomic_sub_and_test(num_pages - i, &eb->io_pages)) | |
3481 | end_extent_buffer_writeback(eb); | |
3482 | ret = -EIO; | |
3483 | break; | |
3484 | } | |
3485 | offset += PAGE_CACHE_SIZE; | |
3486 | update_nr_written(p, wbc, 1); | |
3487 | unlock_page(p); | |
3488 | } | |
3489 | ||
3490 | if (unlikely(ret)) { | |
3491 | for (; i < num_pages; i++) { | |
3492 | struct page *p = extent_buffer_page(eb, i); | |
3493 | unlock_page(p); | |
3494 | } | |
3495 | } | |
3496 | ||
3497 | return ret; | |
3498 | } | |
3499 | ||
3500 | int btree_write_cache_pages(struct address_space *mapping, | |
3501 | struct writeback_control *wbc) | |
3502 | { | |
3503 | struct extent_io_tree *tree = &BTRFS_I(mapping->host)->io_tree; | |
3504 | struct btrfs_fs_info *fs_info = BTRFS_I(mapping->host)->root->fs_info; | |
3505 | struct extent_buffer *eb, *prev_eb = NULL; | |
3506 | struct extent_page_data epd = { | |
3507 | .bio = NULL, | |
3508 | .tree = tree, | |
3509 | .extent_locked = 0, | |
3510 | .sync_io = wbc->sync_mode == WB_SYNC_ALL, | |
de0022b9 | 3511 | .bio_flags = 0, |
0b32f4bb JB |
3512 | }; |
3513 | int ret = 0; | |
3514 | int done = 0; | |
3515 | int nr_to_write_done = 0; | |
3516 | struct pagevec pvec; | |
3517 | int nr_pages; | |
3518 | pgoff_t index; | |
3519 | pgoff_t end; /* Inclusive */ | |
3520 | int scanned = 0; | |
3521 | int tag; | |
3522 | ||
3523 | pagevec_init(&pvec, 0); | |
3524 | if (wbc->range_cyclic) { | |
3525 | index = mapping->writeback_index; /* Start from prev offset */ | |
3526 | end = -1; | |
3527 | } else { | |
3528 | index = wbc->range_start >> PAGE_CACHE_SHIFT; | |
3529 | end = wbc->range_end >> PAGE_CACHE_SHIFT; | |
3530 | scanned = 1; | |
3531 | } | |
3532 | if (wbc->sync_mode == WB_SYNC_ALL) | |
3533 | tag = PAGECACHE_TAG_TOWRITE; | |
3534 | else | |
3535 | tag = PAGECACHE_TAG_DIRTY; | |
3536 | retry: | |
3537 | if (wbc->sync_mode == WB_SYNC_ALL) | |
3538 | tag_pages_for_writeback(mapping, index, end); | |
3539 | while (!done && !nr_to_write_done && (index <= end) && | |
3540 | (nr_pages = pagevec_lookup_tag(&pvec, mapping, &index, tag, | |
3541 | min(end - index, (pgoff_t)PAGEVEC_SIZE-1) + 1))) { | |
3542 | unsigned i; | |
3543 | ||
3544 | scanned = 1; | |
3545 | for (i = 0; i < nr_pages; i++) { | |
3546 | struct page *page = pvec.pages[i]; | |
3547 | ||
3548 | if (!PagePrivate(page)) | |
3549 | continue; | |
3550 | ||
3551 | if (!wbc->range_cyclic && page->index > end) { | |
3552 | done = 1; | |
3553 | break; | |
3554 | } | |
3555 | ||
b5bae261 JB |
3556 | spin_lock(&mapping->private_lock); |
3557 | if (!PagePrivate(page)) { | |
3558 | spin_unlock(&mapping->private_lock); | |
3559 | continue; | |
3560 | } | |
3561 | ||
0b32f4bb | 3562 | eb = (struct extent_buffer *)page->private; |
b5bae261 JB |
3563 | |
3564 | /* | |
3565 | * Shouldn't happen and normally this would be a BUG_ON | |
3566 | * but no sense in crashing the users box for something | |
3567 | * we can survive anyway. | |
3568 | */ | |
fae7f21c | 3569 | if (WARN_ON(!eb)) { |
b5bae261 | 3570 | spin_unlock(&mapping->private_lock); |
0b32f4bb JB |
3571 | continue; |
3572 | } | |
3573 | ||
b5bae261 JB |
3574 | if (eb == prev_eb) { |
3575 | spin_unlock(&mapping->private_lock); | |
0b32f4bb | 3576 | continue; |
b5bae261 | 3577 | } |
0b32f4bb | 3578 | |
b5bae261 JB |
3579 | ret = atomic_inc_not_zero(&eb->refs); |
3580 | spin_unlock(&mapping->private_lock); | |
3581 | if (!ret) | |
0b32f4bb | 3582 | continue; |
0b32f4bb JB |
3583 | |
3584 | prev_eb = eb; | |
3585 | ret = lock_extent_buffer_for_io(eb, fs_info, &epd); | |
3586 | if (!ret) { | |
3587 | free_extent_buffer(eb); | |
3588 | continue; | |
3589 | } | |
3590 | ||
3591 | ret = write_one_eb(eb, fs_info, wbc, &epd); | |
3592 | if (ret) { | |
3593 | done = 1; | |
3594 | free_extent_buffer(eb); | |
3595 | break; | |
3596 | } | |
3597 | free_extent_buffer(eb); | |
3598 | ||
3599 | /* | |
3600 | * the filesystem may choose to bump up nr_to_write. | |
3601 | * We have to make sure to honor the new nr_to_write | |
3602 | * at any time | |
3603 | */ | |
3604 | nr_to_write_done = wbc->nr_to_write <= 0; | |
3605 | } | |
3606 | pagevec_release(&pvec); | |
3607 | cond_resched(); | |
3608 | } | |
3609 | if (!scanned && !done) { | |
3610 | /* | |
3611 | * We hit the last page and there is more work to be done: wrap | |
3612 | * back to the start of the file | |
3613 | */ | |
3614 | scanned = 1; | |
3615 | index = 0; | |
3616 | goto retry; | |
3617 | } | |
3618 | flush_write_bio(&epd); | |
3619 | return ret; | |
3620 | } | |
3621 | ||
d1310b2e | 3622 | /** |
4bef0848 | 3623 | * write_cache_pages - walk the list of dirty pages of the given address space and write all of them. |
d1310b2e CM |
3624 | * @mapping: address space structure to write |
3625 | * @wbc: subtract the number of written pages from *@wbc->nr_to_write | |
3626 | * @writepage: function called for each page | |
3627 | * @data: data passed to writepage function | |
3628 | * | |
3629 | * If a page is already under I/O, write_cache_pages() skips it, even | |
3630 | * if it's dirty. This is desirable behaviour for memory-cleaning writeback, | |
3631 | * but it is INCORRECT for data-integrity system calls such as fsync(). fsync() | |
3632 | * and msync() need to guarantee that all the data which was dirty at the time | |
3633 | * the call was made get new I/O started against them. If wbc->sync_mode is | |
3634 | * WB_SYNC_ALL then we were called for data integrity and we must wait for | |
3635 | * existing IO to complete. | |
3636 | */ | |
b2950863 | 3637 | static int extent_write_cache_pages(struct extent_io_tree *tree, |
4bef0848 CM |
3638 | struct address_space *mapping, |
3639 | struct writeback_control *wbc, | |
d2c3f4f6 CM |
3640 | writepage_t writepage, void *data, |
3641 | void (*flush_fn)(void *)) | |
d1310b2e | 3642 | { |
7fd1a3f7 | 3643 | struct inode *inode = mapping->host; |
d1310b2e CM |
3644 | int ret = 0; |
3645 | int done = 0; | |
f85d7d6c | 3646 | int nr_to_write_done = 0; |
d1310b2e CM |
3647 | struct pagevec pvec; |
3648 | int nr_pages; | |
3649 | pgoff_t index; | |
3650 | pgoff_t end; /* Inclusive */ | |
3651 | int scanned = 0; | |
f7aaa06b | 3652 | int tag; |
d1310b2e | 3653 | |
7fd1a3f7 JB |
3654 | /* |
3655 | * We have to hold onto the inode so that ordered extents can do their | |
3656 | * work when the IO finishes. The alternative to this is failing to add | |
3657 | * an ordered extent if the igrab() fails there and that is a huge pain | |
3658 | * to deal with, so instead just hold onto the inode throughout the | |
3659 | * writepages operation. If it fails here we are freeing up the inode | |
3660 | * anyway and we'd rather not waste our time writing out stuff that is | |
3661 | * going to be truncated anyway. | |
3662 | */ | |
3663 | if (!igrab(inode)) | |
3664 | return 0; | |
3665 | ||
d1310b2e CM |
3666 | pagevec_init(&pvec, 0); |
3667 | if (wbc->range_cyclic) { | |
3668 | index = mapping->writeback_index; /* Start from prev offset */ | |
3669 | end = -1; | |
3670 | } else { | |
3671 | index = wbc->range_start >> PAGE_CACHE_SHIFT; | |
3672 | end = wbc->range_end >> PAGE_CACHE_SHIFT; | |
d1310b2e CM |
3673 | scanned = 1; |
3674 | } | |
f7aaa06b JB |
3675 | if (wbc->sync_mode == WB_SYNC_ALL) |
3676 | tag = PAGECACHE_TAG_TOWRITE; | |
3677 | else | |
3678 | tag = PAGECACHE_TAG_DIRTY; | |
d1310b2e | 3679 | retry: |
f7aaa06b JB |
3680 | if (wbc->sync_mode == WB_SYNC_ALL) |
3681 | tag_pages_for_writeback(mapping, index, end); | |
f85d7d6c | 3682 | while (!done && !nr_to_write_done && (index <= end) && |
f7aaa06b JB |
3683 | (nr_pages = pagevec_lookup_tag(&pvec, mapping, &index, tag, |
3684 | min(end - index, (pgoff_t)PAGEVEC_SIZE-1) + 1))) { | |
d1310b2e CM |
3685 | unsigned i; |
3686 | ||
3687 | scanned = 1; | |
3688 | for (i = 0; i < nr_pages; i++) { | |
3689 | struct page *page = pvec.pages[i]; | |
3690 | ||
3691 | /* | |
3692 | * At this point we hold neither mapping->tree_lock nor | |
3693 | * lock on the page itself: the page may be truncated or | |
3694 | * invalidated (changing page->mapping to NULL), or even | |
3695 | * swizzled back from swapper_space to tmpfs file | |
3696 | * mapping | |
3697 | */ | |
c8f2f24b JB |
3698 | if (!trylock_page(page)) { |
3699 | flush_fn(data); | |
3700 | lock_page(page); | |
01d658f2 | 3701 | } |
d1310b2e CM |
3702 | |
3703 | if (unlikely(page->mapping != mapping)) { | |
3704 | unlock_page(page); | |
3705 | continue; | |
3706 | } | |
3707 | ||
3708 | if (!wbc->range_cyclic && page->index > end) { | |
3709 | done = 1; | |
3710 | unlock_page(page); | |
3711 | continue; | |
3712 | } | |
3713 | ||
d2c3f4f6 | 3714 | if (wbc->sync_mode != WB_SYNC_NONE) { |
0e6bd956 CM |
3715 | if (PageWriteback(page)) |
3716 | flush_fn(data); | |
d1310b2e | 3717 | wait_on_page_writeback(page); |
d2c3f4f6 | 3718 | } |
d1310b2e CM |
3719 | |
3720 | if (PageWriteback(page) || | |
3721 | !clear_page_dirty_for_io(page)) { | |
3722 | unlock_page(page); | |
3723 | continue; | |
3724 | } | |
3725 | ||
3726 | ret = (*writepage)(page, wbc, data); | |
3727 | ||
3728 | if (unlikely(ret == AOP_WRITEPAGE_ACTIVATE)) { | |
3729 | unlock_page(page); | |
3730 | ret = 0; | |
3731 | } | |
f85d7d6c | 3732 | if (ret) |
d1310b2e | 3733 | done = 1; |
f85d7d6c CM |
3734 | |
3735 | /* | |
3736 | * the filesystem may choose to bump up nr_to_write. | |
3737 | * We have to make sure to honor the new nr_to_write | |
3738 | * at any time | |
3739 | */ | |
3740 | nr_to_write_done = wbc->nr_to_write <= 0; | |
d1310b2e CM |
3741 | } |
3742 | pagevec_release(&pvec); | |
3743 | cond_resched(); | |
3744 | } | |
3745 | if (!scanned && !done) { | |
3746 | /* | |
3747 | * We hit the last page and there is more work to be done: wrap | |
3748 | * back to the start of the file | |
3749 | */ | |
3750 | scanned = 1; | |
3751 | index = 0; | |
3752 | goto retry; | |
3753 | } | |
7fd1a3f7 | 3754 | btrfs_add_delayed_iput(inode); |
d1310b2e CM |
3755 | return ret; |
3756 | } | |
d1310b2e | 3757 | |
ffbd517d | 3758 | static void flush_epd_write_bio(struct extent_page_data *epd) |
d2c3f4f6 | 3759 | { |
d2c3f4f6 | 3760 | if (epd->bio) { |
355808c2 JM |
3761 | int rw = WRITE; |
3762 | int ret; | |
3763 | ||
ffbd517d | 3764 | if (epd->sync_io) |
355808c2 JM |
3765 | rw = WRITE_SYNC; |
3766 | ||
de0022b9 | 3767 | ret = submit_one_bio(rw, epd->bio, 0, epd->bio_flags); |
79787eaa | 3768 | BUG_ON(ret < 0); /* -ENOMEM */ |
d2c3f4f6 CM |
3769 | epd->bio = NULL; |
3770 | } | |
3771 | } | |
3772 | ||
ffbd517d CM |
3773 | static noinline void flush_write_bio(void *data) |
3774 | { | |
3775 | struct extent_page_data *epd = data; | |
3776 | flush_epd_write_bio(epd); | |
3777 | } | |
3778 | ||
d1310b2e CM |
3779 | int extent_write_full_page(struct extent_io_tree *tree, struct page *page, |
3780 | get_extent_t *get_extent, | |
3781 | struct writeback_control *wbc) | |
3782 | { | |
3783 | int ret; | |
d1310b2e CM |
3784 | struct extent_page_data epd = { |
3785 | .bio = NULL, | |
3786 | .tree = tree, | |
3787 | .get_extent = get_extent, | |
771ed689 | 3788 | .extent_locked = 0, |
ffbd517d | 3789 | .sync_io = wbc->sync_mode == WB_SYNC_ALL, |
de0022b9 | 3790 | .bio_flags = 0, |
d1310b2e | 3791 | }; |
d1310b2e | 3792 | |
d1310b2e CM |
3793 | ret = __extent_writepage(page, wbc, &epd); |
3794 | ||
ffbd517d | 3795 | flush_epd_write_bio(&epd); |
d1310b2e CM |
3796 | return ret; |
3797 | } | |
d1310b2e | 3798 | |
771ed689 CM |
3799 | int extent_write_locked_range(struct extent_io_tree *tree, struct inode *inode, |
3800 | u64 start, u64 end, get_extent_t *get_extent, | |
3801 | int mode) | |
3802 | { | |
3803 | int ret = 0; | |
3804 | struct address_space *mapping = inode->i_mapping; | |
3805 | struct page *page; | |
3806 | unsigned long nr_pages = (end - start + PAGE_CACHE_SIZE) >> | |
3807 | PAGE_CACHE_SHIFT; | |
3808 | ||
3809 | struct extent_page_data epd = { | |
3810 | .bio = NULL, | |
3811 | .tree = tree, | |
3812 | .get_extent = get_extent, | |
3813 | .extent_locked = 1, | |
ffbd517d | 3814 | .sync_io = mode == WB_SYNC_ALL, |
de0022b9 | 3815 | .bio_flags = 0, |
771ed689 CM |
3816 | }; |
3817 | struct writeback_control wbc_writepages = { | |
771ed689 | 3818 | .sync_mode = mode, |
771ed689 CM |
3819 | .nr_to_write = nr_pages * 2, |
3820 | .range_start = start, | |
3821 | .range_end = end + 1, | |
3822 | }; | |
3823 | ||
d397712b | 3824 | while (start <= end) { |
771ed689 CM |
3825 | page = find_get_page(mapping, start >> PAGE_CACHE_SHIFT); |
3826 | if (clear_page_dirty_for_io(page)) | |
3827 | ret = __extent_writepage(page, &wbc_writepages, &epd); | |
3828 | else { | |
3829 | if (tree->ops && tree->ops->writepage_end_io_hook) | |
3830 | tree->ops->writepage_end_io_hook(page, start, | |
3831 | start + PAGE_CACHE_SIZE - 1, | |
3832 | NULL, 1); | |
3833 | unlock_page(page); | |
3834 | } | |
3835 | page_cache_release(page); | |
3836 | start += PAGE_CACHE_SIZE; | |
3837 | } | |
3838 | ||
ffbd517d | 3839 | flush_epd_write_bio(&epd); |
771ed689 CM |
3840 | return ret; |
3841 | } | |
d1310b2e CM |
3842 | |
3843 | int extent_writepages(struct extent_io_tree *tree, | |
3844 | struct address_space *mapping, | |
3845 | get_extent_t *get_extent, | |
3846 | struct writeback_control *wbc) | |
3847 | { | |
3848 | int ret = 0; | |
3849 | struct extent_page_data epd = { | |
3850 | .bio = NULL, | |
3851 | .tree = tree, | |
3852 | .get_extent = get_extent, | |
771ed689 | 3853 | .extent_locked = 0, |
ffbd517d | 3854 | .sync_io = wbc->sync_mode == WB_SYNC_ALL, |
de0022b9 | 3855 | .bio_flags = 0, |
d1310b2e CM |
3856 | }; |
3857 | ||
4bef0848 | 3858 | ret = extent_write_cache_pages(tree, mapping, wbc, |
d2c3f4f6 CM |
3859 | __extent_writepage, &epd, |
3860 | flush_write_bio); | |
ffbd517d | 3861 | flush_epd_write_bio(&epd); |
d1310b2e CM |
3862 | return ret; |
3863 | } | |
d1310b2e CM |
3864 | |
3865 | int extent_readpages(struct extent_io_tree *tree, | |
3866 | struct address_space *mapping, | |
3867 | struct list_head *pages, unsigned nr_pages, | |
3868 | get_extent_t get_extent) | |
3869 | { | |
3870 | struct bio *bio = NULL; | |
3871 | unsigned page_idx; | |
c8b97818 | 3872 | unsigned long bio_flags = 0; |
67c9684f LB |
3873 | struct page *pagepool[16]; |
3874 | struct page *page; | |
125bac01 | 3875 | struct extent_map *em_cached = NULL; |
67c9684f | 3876 | int nr = 0; |
d1310b2e | 3877 | |
d1310b2e | 3878 | for (page_idx = 0; page_idx < nr_pages; page_idx++) { |
67c9684f | 3879 | page = list_entry(pages->prev, struct page, lru); |
d1310b2e CM |
3880 | |
3881 | prefetchw(&page->flags); | |
3882 | list_del(&page->lru); | |
67c9684f | 3883 | if (add_to_page_cache_lru(page, mapping, |
43e817a1 | 3884 | page->index, GFP_NOFS)) { |
67c9684f LB |
3885 | page_cache_release(page); |
3886 | continue; | |
d1310b2e | 3887 | } |
67c9684f LB |
3888 | |
3889 | pagepool[nr++] = page; | |
3890 | if (nr < ARRAY_SIZE(pagepool)) | |
3891 | continue; | |
125bac01 | 3892 | __extent_readpages(tree, pagepool, nr, get_extent, &em_cached, |
9974090b | 3893 | &bio, 0, &bio_flags, READ); |
67c9684f | 3894 | nr = 0; |
d1310b2e | 3895 | } |
9974090b | 3896 | if (nr) |
125bac01 | 3897 | __extent_readpages(tree, pagepool, nr, get_extent, &em_cached, |
9974090b | 3898 | &bio, 0, &bio_flags, READ); |
67c9684f | 3899 | |
125bac01 MX |
3900 | if (em_cached) |
3901 | free_extent_map(em_cached); | |
3902 | ||
d1310b2e CM |
3903 | BUG_ON(!list_empty(pages)); |
3904 | if (bio) | |
79787eaa | 3905 | return submit_one_bio(READ, bio, 0, bio_flags); |
d1310b2e CM |
3906 | return 0; |
3907 | } | |
d1310b2e CM |
3908 | |
3909 | /* | |
3910 | * basic invalidatepage code, this waits on any locked or writeback | |
3911 | * ranges corresponding to the page, and then deletes any extent state | |
3912 | * records from the tree | |
3913 | */ | |
3914 | int extent_invalidatepage(struct extent_io_tree *tree, | |
3915 | struct page *page, unsigned long offset) | |
3916 | { | |
2ac55d41 | 3917 | struct extent_state *cached_state = NULL; |
4eee4fa4 | 3918 | u64 start = page_offset(page); |
d1310b2e CM |
3919 | u64 end = start + PAGE_CACHE_SIZE - 1; |
3920 | size_t blocksize = page->mapping->host->i_sb->s_blocksize; | |
3921 | ||
fda2832f | 3922 | start += ALIGN(offset, blocksize); |
d1310b2e CM |
3923 | if (start > end) |
3924 | return 0; | |
3925 | ||
d0082371 | 3926 | lock_extent_bits(tree, start, end, 0, &cached_state); |
1edbb734 | 3927 | wait_on_page_writeback(page); |
d1310b2e | 3928 | clear_extent_bit(tree, start, end, |
32c00aff JB |
3929 | EXTENT_LOCKED | EXTENT_DIRTY | EXTENT_DELALLOC | |
3930 | EXTENT_DO_ACCOUNTING, | |
2ac55d41 | 3931 | 1, 1, &cached_state, GFP_NOFS); |
d1310b2e CM |
3932 | return 0; |
3933 | } | |
d1310b2e | 3934 | |
7b13b7b1 CM |
3935 | /* |
3936 | * a helper for releasepage, this tests for areas of the page that | |
3937 | * are locked or under IO and drops the related state bits if it is safe | |
3938 | * to drop the page. | |
3939 | */ | |
48a3b636 ES |
3940 | static int try_release_extent_state(struct extent_map_tree *map, |
3941 | struct extent_io_tree *tree, | |
3942 | struct page *page, gfp_t mask) | |
7b13b7b1 | 3943 | { |
4eee4fa4 | 3944 | u64 start = page_offset(page); |
7b13b7b1 CM |
3945 | u64 end = start + PAGE_CACHE_SIZE - 1; |
3946 | int ret = 1; | |
3947 | ||
211f90e6 | 3948 | if (test_range_bit(tree, start, end, |
8b62b72b | 3949 | EXTENT_IOBITS, 0, NULL)) |
7b13b7b1 CM |
3950 | ret = 0; |
3951 | else { | |
3952 | if ((mask & GFP_NOFS) == GFP_NOFS) | |
3953 | mask = GFP_NOFS; | |
11ef160f CM |
3954 | /* |
3955 | * at this point we can safely clear everything except the | |
3956 | * locked bit and the nodatasum bit | |
3957 | */ | |
e3f24cc5 | 3958 | ret = clear_extent_bit(tree, start, end, |
11ef160f CM |
3959 | ~(EXTENT_LOCKED | EXTENT_NODATASUM), |
3960 | 0, 0, NULL, mask); | |
e3f24cc5 CM |
3961 | |
3962 | /* if clear_extent_bit failed for enomem reasons, | |
3963 | * we can't allow the release to continue. | |
3964 | */ | |
3965 | if (ret < 0) | |
3966 | ret = 0; | |
3967 | else | |
3968 | ret = 1; | |
7b13b7b1 CM |
3969 | } |
3970 | return ret; | |
3971 | } | |
7b13b7b1 | 3972 | |
d1310b2e CM |
3973 | /* |
3974 | * a helper for releasepage. As long as there are no locked extents | |
3975 | * in the range corresponding to the page, both state records and extent | |
3976 | * map records are removed | |
3977 | */ | |
3978 | int try_release_extent_mapping(struct extent_map_tree *map, | |
70dec807 CM |
3979 | struct extent_io_tree *tree, struct page *page, |
3980 | gfp_t mask) | |
d1310b2e CM |
3981 | { |
3982 | struct extent_map *em; | |
4eee4fa4 | 3983 | u64 start = page_offset(page); |
d1310b2e | 3984 | u64 end = start + PAGE_CACHE_SIZE - 1; |
7b13b7b1 | 3985 | |
70dec807 CM |
3986 | if ((mask & __GFP_WAIT) && |
3987 | page->mapping->host->i_size > 16 * 1024 * 1024) { | |
39b5637f | 3988 | u64 len; |
70dec807 | 3989 | while (start <= end) { |
39b5637f | 3990 | len = end - start + 1; |
890871be | 3991 | write_lock(&map->lock); |
39b5637f | 3992 | em = lookup_extent_mapping(map, start, len); |
285190d9 | 3993 | if (!em) { |
890871be | 3994 | write_unlock(&map->lock); |
70dec807 CM |
3995 | break; |
3996 | } | |
7f3c74fb CM |
3997 | if (test_bit(EXTENT_FLAG_PINNED, &em->flags) || |
3998 | em->start != start) { | |
890871be | 3999 | write_unlock(&map->lock); |
70dec807 CM |
4000 | free_extent_map(em); |
4001 | break; | |
4002 | } | |
4003 | if (!test_range_bit(tree, em->start, | |
4004 | extent_map_end(em) - 1, | |
8b62b72b | 4005 | EXTENT_LOCKED | EXTENT_WRITEBACK, |
9655d298 | 4006 | 0, NULL)) { |
70dec807 CM |
4007 | remove_extent_mapping(map, em); |
4008 | /* once for the rb tree */ | |
4009 | free_extent_map(em); | |
4010 | } | |
4011 | start = extent_map_end(em); | |
890871be | 4012 | write_unlock(&map->lock); |
70dec807 CM |
4013 | |
4014 | /* once for us */ | |
d1310b2e CM |
4015 | free_extent_map(em); |
4016 | } | |
d1310b2e | 4017 | } |
7b13b7b1 | 4018 | return try_release_extent_state(map, tree, page, mask); |
d1310b2e | 4019 | } |
d1310b2e | 4020 | |
ec29ed5b CM |
4021 | /* |
4022 | * helper function for fiemap, which doesn't want to see any holes. | |
4023 | * This maps until we find something past 'last' | |
4024 | */ | |
4025 | static struct extent_map *get_extent_skip_holes(struct inode *inode, | |
4026 | u64 offset, | |
4027 | u64 last, | |
4028 | get_extent_t *get_extent) | |
4029 | { | |
4030 | u64 sectorsize = BTRFS_I(inode)->root->sectorsize; | |
4031 | struct extent_map *em; | |
4032 | u64 len; | |
4033 | ||
4034 | if (offset >= last) | |
4035 | return NULL; | |
4036 | ||
67871254 | 4037 | while (1) { |
ec29ed5b CM |
4038 | len = last - offset; |
4039 | if (len == 0) | |
4040 | break; | |
fda2832f | 4041 | len = ALIGN(len, sectorsize); |
ec29ed5b | 4042 | em = get_extent(inode, NULL, 0, offset, len, 0); |
c704005d | 4043 | if (IS_ERR_OR_NULL(em)) |
ec29ed5b CM |
4044 | return em; |
4045 | ||
4046 | /* if this isn't a hole return it */ | |
4047 | if (!test_bit(EXTENT_FLAG_VACANCY, &em->flags) && | |
4048 | em->block_start != EXTENT_MAP_HOLE) { | |
4049 | return em; | |
4050 | } | |
4051 | ||
4052 | /* this is a hole, advance to the next extent */ | |
4053 | offset = extent_map_end(em); | |
4054 | free_extent_map(em); | |
4055 | if (offset >= last) | |
4056 | break; | |
4057 | } | |
4058 | return NULL; | |
4059 | } | |
4060 | ||
fe09e16c LB |
4061 | static noinline int count_ext_ref(u64 inum, u64 offset, u64 root_id, void *ctx) |
4062 | { | |
4063 | unsigned long cnt = *((unsigned long *)ctx); | |
4064 | ||
4065 | cnt++; | |
4066 | *((unsigned long *)ctx) = cnt; | |
4067 | ||
4068 | /* Now we're sure that the extent is shared. */ | |
4069 | if (cnt > 1) | |
4070 | return 1; | |
4071 | return 0; | |
4072 | } | |
4073 | ||
1506fcc8 YS |
4074 | int extent_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, |
4075 | __u64 start, __u64 len, get_extent_t *get_extent) | |
4076 | { | |
975f84fe | 4077 | int ret = 0; |
1506fcc8 YS |
4078 | u64 off = start; |
4079 | u64 max = start + len; | |
4080 | u32 flags = 0; | |
975f84fe JB |
4081 | u32 found_type; |
4082 | u64 last; | |
ec29ed5b | 4083 | u64 last_for_get_extent = 0; |
1506fcc8 | 4084 | u64 disko = 0; |
ec29ed5b | 4085 | u64 isize = i_size_read(inode); |
975f84fe | 4086 | struct btrfs_key found_key; |
1506fcc8 | 4087 | struct extent_map *em = NULL; |
2ac55d41 | 4088 | struct extent_state *cached_state = NULL; |
975f84fe JB |
4089 | struct btrfs_path *path; |
4090 | struct btrfs_file_extent_item *item; | |
1506fcc8 | 4091 | int end = 0; |
ec29ed5b CM |
4092 | u64 em_start = 0; |
4093 | u64 em_len = 0; | |
4094 | u64 em_end = 0; | |
1506fcc8 | 4095 | unsigned long emflags; |
1506fcc8 YS |
4096 | |
4097 | if (len == 0) | |
4098 | return -EINVAL; | |
4099 | ||
975f84fe JB |
4100 | path = btrfs_alloc_path(); |
4101 | if (!path) | |
4102 | return -ENOMEM; | |
4103 | path->leave_spinning = 1; | |
4104 | ||
4d479cf0 JB |
4105 | start = ALIGN(start, BTRFS_I(inode)->root->sectorsize); |
4106 | len = ALIGN(len, BTRFS_I(inode)->root->sectorsize); | |
4107 | ||
ec29ed5b CM |
4108 | /* |
4109 | * lookup the last file extent. We're not using i_size here | |
4110 | * because there might be preallocation past i_size | |
4111 | */ | |
975f84fe | 4112 | ret = btrfs_lookup_file_extent(NULL, BTRFS_I(inode)->root, |
33345d01 | 4113 | path, btrfs_ino(inode), -1, 0); |
975f84fe JB |
4114 | if (ret < 0) { |
4115 | btrfs_free_path(path); | |
4116 | return ret; | |
4117 | } | |
4118 | WARN_ON(!ret); | |
4119 | path->slots[0]--; | |
4120 | item = btrfs_item_ptr(path->nodes[0], path->slots[0], | |
4121 | struct btrfs_file_extent_item); | |
4122 | btrfs_item_key_to_cpu(path->nodes[0], &found_key, path->slots[0]); | |
4123 | found_type = btrfs_key_type(&found_key); | |
4124 | ||
ec29ed5b | 4125 | /* No extents, but there might be delalloc bits */ |
33345d01 | 4126 | if (found_key.objectid != btrfs_ino(inode) || |
975f84fe | 4127 | found_type != BTRFS_EXTENT_DATA_KEY) { |
ec29ed5b CM |
4128 | /* have to trust i_size as the end */ |
4129 | last = (u64)-1; | |
4130 | last_for_get_extent = isize; | |
4131 | } else { | |
4132 | /* | |
4133 | * remember the start of the last extent. There are a | |
4134 | * bunch of different factors that go into the length of the | |
4135 | * extent, so its much less complex to remember where it started | |
4136 | */ | |
4137 | last = found_key.offset; | |
4138 | last_for_get_extent = last + 1; | |
975f84fe | 4139 | } |
fe09e16c | 4140 | btrfs_release_path(path); |
975f84fe | 4141 | |
ec29ed5b CM |
4142 | /* |
4143 | * we might have some extents allocated but more delalloc past those | |
4144 | * extents. so, we trust isize unless the start of the last extent is | |
4145 | * beyond isize | |
4146 | */ | |
4147 | if (last < isize) { | |
4148 | last = (u64)-1; | |
4149 | last_for_get_extent = isize; | |
4150 | } | |
4151 | ||
a52f4cd2 | 4152 | lock_extent_bits(&BTRFS_I(inode)->io_tree, start, start + len - 1, 0, |
d0082371 | 4153 | &cached_state); |
ec29ed5b | 4154 | |
4d479cf0 | 4155 | em = get_extent_skip_holes(inode, start, last_for_get_extent, |
ec29ed5b | 4156 | get_extent); |
1506fcc8 YS |
4157 | if (!em) |
4158 | goto out; | |
4159 | if (IS_ERR(em)) { | |
4160 | ret = PTR_ERR(em); | |
4161 | goto out; | |
4162 | } | |
975f84fe | 4163 | |
1506fcc8 | 4164 | while (!end) { |
b76bb701 | 4165 | u64 offset_in_extent = 0; |
ea8efc74 CM |
4166 | |
4167 | /* break if the extent we found is outside the range */ | |
4168 | if (em->start >= max || extent_map_end(em) < off) | |
4169 | break; | |
4170 | ||
4171 | /* | |
4172 | * get_extent may return an extent that starts before our | |
4173 | * requested range. We have to make sure the ranges | |
4174 | * we return to fiemap always move forward and don't | |
4175 | * overlap, so adjust the offsets here | |
4176 | */ | |
4177 | em_start = max(em->start, off); | |
1506fcc8 | 4178 | |
ea8efc74 CM |
4179 | /* |
4180 | * record the offset from the start of the extent | |
b76bb701 JB |
4181 | * for adjusting the disk offset below. Only do this if the |
4182 | * extent isn't compressed since our in ram offset may be past | |
4183 | * what we have actually allocated on disk. | |
ea8efc74 | 4184 | */ |
b76bb701 JB |
4185 | if (!test_bit(EXTENT_FLAG_COMPRESSED, &em->flags)) |
4186 | offset_in_extent = em_start - em->start; | |
ec29ed5b | 4187 | em_end = extent_map_end(em); |
ea8efc74 | 4188 | em_len = em_end - em_start; |
ec29ed5b | 4189 | emflags = em->flags; |
1506fcc8 YS |
4190 | disko = 0; |
4191 | flags = 0; | |
4192 | ||
ea8efc74 CM |
4193 | /* |
4194 | * bump off for our next call to get_extent | |
4195 | */ | |
4196 | off = extent_map_end(em); | |
4197 | if (off >= max) | |
4198 | end = 1; | |
4199 | ||
93dbfad7 | 4200 | if (em->block_start == EXTENT_MAP_LAST_BYTE) { |
1506fcc8 YS |
4201 | end = 1; |
4202 | flags |= FIEMAP_EXTENT_LAST; | |
93dbfad7 | 4203 | } else if (em->block_start == EXTENT_MAP_INLINE) { |
1506fcc8 YS |
4204 | flags |= (FIEMAP_EXTENT_DATA_INLINE | |
4205 | FIEMAP_EXTENT_NOT_ALIGNED); | |
93dbfad7 | 4206 | } else if (em->block_start == EXTENT_MAP_DELALLOC) { |
1506fcc8 YS |
4207 | flags |= (FIEMAP_EXTENT_DELALLOC | |
4208 | FIEMAP_EXTENT_UNKNOWN); | |
93dbfad7 | 4209 | } else { |
fe09e16c LB |
4210 | unsigned long ref_cnt = 0; |
4211 | ||
ea8efc74 | 4212 | disko = em->block_start + offset_in_extent; |
fe09e16c LB |
4213 | |
4214 | /* | |
4215 | * As btrfs supports shared space, this information | |
4216 | * can be exported to userspace tools via | |
4217 | * flag FIEMAP_EXTENT_SHARED. | |
4218 | */ | |
4219 | ret = iterate_inodes_from_logical( | |
4220 | em->block_start, | |
4221 | BTRFS_I(inode)->root->fs_info, | |
4222 | path, count_ext_ref, &ref_cnt); | |
4223 | if (ret < 0 && ret != -ENOENT) | |
4224 | goto out_free; | |
4225 | ||
4226 | if (ref_cnt > 1) | |
4227 | flags |= FIEMAP_EXTENT_SHARED; | |
1506fcc8 YS |
4228 | } |
4229 | if (test_bit(EXTENT_FLAG_COMPRESSED, &em->flags)) | |
4230 | flags |= FIEMAP_EXTENT_ENCODED; | |
4231 | ||
1506fcc8 YS |
4232 | free_extent_map(em); |
4233 | em = NULL; | |
ec29ed5b CM |
4234 | if ((em_start >= last) || em_len == (u64)-1 || |
4235 | (last == (u64)-1 && isize <= em_end)) { | |
1506fcc8 YS |
4236 | flags |= FIEMAP_EXTENT_LAST; |
4237 | end = 1; | |
4238 | } | |
4239 | ||
ec29ed5b CM |
4240 | /* now scan forward to see if this is really the last extent. */ |
4241 | em = get_extent_skip_holes(inode, off, last_for_get_extent, | |
4242 | get_extent); | |
4243 | if (IS_ERR(em)) { | |
4244 | ret = PTR_ERR(em); | |
4245 | goto out; | |
4246 | } | |
4247 | if (!em) { | |
975f84fe JB |
4248 | flags |= FIEMAP_EXTENT_LAST; |
4249 | end = 1; | |
4250 | } | |
ec29ed5b CM |
4251 | ret = fiemap_fill_next_extent(fieinfo, em_start, disko, |
4252 | em_len, flags); | |
4253 | if (ret) | |
4254 | goto out_free; | |
1506fcc8 YS |
4255 | } |
4256 | out_free: | |
4257 | free_extent_map(em); | |
4258 | out: | |
fe09e16c | 4259 | btrfs_free_path(path); |
a52f4cd2 | 4260 | unlock_extent_cached(&BTRFS_I(inode)->io_tree, start, start + len - 1, |
2ac55d41 | 4261 | &cached_state, GFP_NOFS); |
1506fcc8 YS |
4262 | return ret; |
4263 | } | |
4264 | ||
727011e0 CM |
4265 | static void __free_extent_buffer(struct extent_buffer *eb) |
4266 | { | |
6d49ba1b | 4267 | btrfs_leak_debug_del(&eb->leak_list); |
727011e0 CM |
4268 | kmem_cache_free(extent_buffer_cache, eb); |
4269 | } | |
4270 | ||
db7f3436 JB |
4271 | static int extent_buffer_under_io(struct extent_buffer *eb) |
4272 | { | |
4273 | return (atomic_read(&eb->io_pages) || | |
4274 | test_bit(EXTENT_BUFFER_WRITEBACK, &eb->bflags) || | |
4275 | test_bit(EXTENT_BUFFER_DIRTY, &eb->bflags)); | |
4276 | } | |
4277 | ||
4278 | /* | |
4279 | * Helper for releasing extent buffer page. | |
4280 | */ | |
4281 | static void btrfs_release_extent_buffer_page(struct extent_buffer *eb, | |
4282 | unsigned long start_idx) | |
4283 | { | |
4284 | unsigned long index; | |
4285 | unsigned long num_pages; | |
4286 | struct page *page; | |
4287 | int mapped = !test_bit(EXTENT_BUFFER_DUMMY, &eb->bflags); | |
4288 | ||
4289 | BUG_ON(extent_buffer_under_io(eb)); | |
4290 | ||
4291 | num_pages = num_extent_pages(eb->start, eb->len); | |
4292 | index = start_idx + num_pages; | |
4293 | if (start_idx >= index) | |
4294 | return; | |
4295 | ||
4296 | do { | |
4297 | index--; | |
4298 | page = extent_buffer_page(eb, index); | |
4299 | if (page && mapped) { | |
4300 | spin_lock(&page->mapping->private_lock); | |
4301 | /* | |
4302 | * We do this since we'll remove the pages after we've | |
4303 | * removed the eb from the radix tree, so we could race | |
4304 | * and have this page now attached to the new eb. So | |
4305 | * only clear page_private if it's still connected to | |
4306 | * this eb. | |
4307 | */ | |
4308 | if (PagePrivate(page) && | |
4309 | page->private == (unsigned long)eb) { | |
4310 | BUG_ON(test_bit(EXTENT_BUFFER_DIRTY, &eb->bflags)); | |
4311 | BUG_ON(PageDirty(page)); | |
4312 | BUG_ON(PageWriteback(page)); | |
4313 | /* | |
4314 | * We need to make sure we haven't be attached | |
4315 | * to a new eb. | |
4316 | */ | |
4317 | ClearPagePrivate(page); | |
4318 | set_page_private(page, 0); | |
4319 | /* One for the page private */ | |
4320 | page_cache_release(page); | |
4321 | } | |
4322 | spin_unlock(&page->mapping->private_lock); | |
4323 | ||
4324 | } | |
4325 | if (page) { | |
4326 | /* One for when we alloced the page */ | |
4327 | page_cache_release(page); | |
4328 | } | |
4329 | } while (index != start_idx); | |
4330 | } | |
4331 | ||
4332 | /* | |
4333 | * Helper for releasing the extent buffer. | |
4334 | */ | |
4335 | static inline void btrfs_release_extent_buffer(struct extent_buffer *eb) | |
4336 | { | |
4337 | btrfs_release_extent_buffer_page(eb, 0); | |
4338 | __free_extent_buffer(eb); | |
4339 | } | |
4340 | ||
d1310b2e CM |
4341 | static struct extent_buffer *__alloc_extent_buffer(struct extent_io_tree *tree, |
4342 | u64 start, | |
4343 | unsigned long len, | |
4344 | gfp_t mask) | |
4345 | { | |
4346 | struct extent_buffer *eb = NULL; | |
4347 | ||
d1310b2e | 4348 | eb = kmem_cache_zalloc(extent_buffer_cache, mask); |
91ca338d TI |
4349 | if (eb == NULL) |
4350 | return NULL; | |
d1310b2e CM |
4351 | eb->start = start; |
4352 | eb->len = len; | |
4f2de97a | 4353 | eb->tree = tree; |
815a51c7 | 4354 | eb->bflags = 0; |
bd681513 CM |
4355 | rwlock_init(&eb->lock); |
4356 | atomic_set(&eb->write_locks, 0); | |
4357 | atomic_set(&eb->read_locks, 0); | |
4358 | atomic_set(&eb->blocking_readers, 0); | |
4359 | atomic_set(&eb->blocking_writers, 0); | |
4360 | atomic_set(&eb->spinning_readers, 0); | |
4361 | atomic_set(&eb->spinning_writers, 0); | |
5b25f70f | 4362 | eb->lock_nested = 0; |
bd681513 CM |
4363 | init_waitqueue_head(&eb->write_lock_wq); |
4364 | init_waitqueue_head(&eb->read_lock_wq); | |
b4ce94de | 4365 | |
6d49ba1b ES |
4366 | btrfs_leak_debug_add(&eb->leak_list, &buffers); |
4367 | ||
3083ee2e | 4368 | spin_lock_init(&eb->refs_lock); |
d1310b2e | 4369 | atomic_set(&eb->refs, 1); |
0b32f4bb | 4370 | atomic_set(&eb->io_pages, 0); |
727011e0 | 4371 | |
b8dae313 DS |
4372 | /* |
4373 | * Sanity checks, currently the maximum is 64k covered by 16x 4k pages | |
4374 | */ | |
4375 | BUILD_BUG_ON(BTRFS_MAX_METADATA_BLOCKSIZE | |
4376 | > MAX_INLINE_EXTENT_BUFFER_SIZE); | |
4377 | BUG_ON(len > MAX_INLINE_EXTENT_BUFFER_SIZE); | |
d1310b2e CM |
4378 | |
4379 | return eb; | |
4380 | } | |
4381 | ||
815a51c7 JS |
4382 | struct extent_buffer *btrfs_clone_extent_buffer(struct extent_buffer *src) |
4383 | { | |
4384 | unsigned long i; | |
4385 | struct page *p; | |
4386 | struct extent_buffer *new; | |
4387 | unsigned long num_pages = num_extent_pages(src->start, src->len); | |
4388 | ||
9ec72677 | 4389 | new = __alloc_extent_buffer(NULL, src->start, src->len, GFP_NOFS); |
815a51c7 JS |
4390 | if (new == NULL) |
4391 | return NULL; | |
4392 | ||
4393 | for (i = 0; i < num_pages; i++) { | |
9ec72677 | 4394 | p = alloc_page(GFP_NOFS); |
db7f3436 JB |
4395 | if (!p) { |
4396 | btrfs_release_extent_buffer(new); | |
4397 | return NULL; | |
4398 | } | |
815a51c7 JS |
4399 | attach_extent_buffer_page(new, p); |
4400 | WARN_ON(PageDirty(p)); | |
4401 | SetPageUptodate(p); | |
4402 | new->pages[i] = p; | |
4403 | } | |
4404 | ||
4405 | copy_extent_buffer(new, src, 0, 0, src->len); | |
4406 | set_bit(EXTENT_BUFFER_UPTODATE, &new->bflags); | |
4407 | set_bit(EXTENT_BUFFER_DUMMY, &new->bflags); | |
4408 | ||
4409 | return new; | |
4410 | } | |
4411 | ||
4412 | struct extent_buffer *alloc_dummy_extent_buffer(u64 start, unsigned long len) | |
4413 | { | |
4414 | struct extent_buffer *eb; | |
4415 | unsigned long num_pages = num_extent_pages(0, len); | |
4416 | unsigned long i; | |
4417 | ||
9ec72677 | 4418 | eb = __alloc_extent_buffer(NULL, start, len, GFP_NOFS); |
815a51c7 JS |
4419 | if (!eb) |
4420 | return NULL; | |
4421 | ||
4422 | for (i = 0; i < num_pages; i++) { | |
9ec72677 | 4423 | eb->pages[i] = alloc_page(GFP_NOFS); |
815a51c7 JS |
4424 | if (!eb->pages[i]) |
4425 | goto err; | |
4426 | } | |
4427 | set_extent_buffer_uptodate(eb); | |
4428 | btrfs_set_header_nritems(eb, 0); | |
4429 | set_bit(EXTENT_BUFFER_DUMMY, &eb->bflags); | |
4430 | ||
4431 | return eb; | |
4432 | err: | |
84167d19 SB |
4433 | for (; i > 0; i--) |
4434 | __free_page(eb->pages[i - 1]); | |
815a51c7 JS |
4435 | __free_extent_buffer(eb); |
4436 | return NULL; | |
4437 | } | |
4438 | ||
0b32f4bb JB |
4439 | static void check_buffer_tree_ref(struct extent_buffer *eb) |
4440 | { | |
242e18c7 | 4441 | int refs; |
0b32f4bb JB |
4442 | /* the ref bit is tricky. We have to make sure it is set |
4443 | * if we have the buffer dirty. Otherwise the | |
4444 | * code to free a buffer can end up dropping a dirty | |
4445 | * page | |
4446 | * | |
4447 | * Once the ref bit is set, it won't go away while the | |
4448 | * buffer is dirty or in writeback, and it also won't | |
4449 | * go away while we have the reference count on the | |
4450 | * eb bumped. | |
4451 | * | |
4452 | * We can't just set the ref bit without bumping the | |
4453 | * ref on the eb because free_extent_buffer might | |
4454 | * see the ref bit and try to clear it. If this happens | |
4455 | * free_extent_buffer might end up dropping our original | |
4456 | * ref by mistake and freeing the page before we are able | |
4457 | * to add one more ref. | |
4458 | * | |
4459 | * So bump the ref count first, then set the bit. If someone | |
4460 | * beat us to it, drop the ref we added. | |
4461 | */ | |
242e18c7 CM |
4462 | refs = atomic_read(&eb->refs); |
4463 | if (refs >= 2 && test_bit(EXTENT_BUFFER_TREE_REF, &eb->bflags)) | |
4464 | return; | |
4465 | ||
594831c4 JB |
4466 | spin_lock(&eb->refs_lock); |
4467 | if (!test_and_set_bit(EXTENT_BUFFER_TREE_REF, &eb->bflags)) | |
0b32f4bb | 4468 | atomic_inc(&eb->refs); |
594831c4 | 4469 | spin_unlock(&eb->refs_lock); |
0b32f4bb JB |
4470 | } |
4471 | ||
5df4235e JB |
4472 | static void mark_extent_buffer_accessed(struct extent_buffer *eb) |
4473 | { | |
4474 | unsigned long num_pages, i; | |
4475 | ||
0b32f4bb JB |
4476 | check_buffer_tree_ref(eb); |
4477 | ||
5df4235e JB |
4478 | num_pages = num_extent_pages(eb->start, eb->len); |
4479 | for (i = 0; i < num_pages; i++) { | |
4480 | struct page *p = extent_buffer_page(eb, i); | |
4481 | mark_page_accessed(p); | |
4482 | } | |
4483 | } | |
4484 | ||
452c75c3 CS |
4485 | struct extent_buffer *find_extent_buffer(struct extent_io_tree *tree, |
4486 | u64 start) | |
4487 | { | |
4488 | struct extent_buffer *eb; | |
4489 | ||
4490 | rcu_read_lock(); | |
4491 | eb = radix_tree_lookup(&tree->buffer, start >> PAGE_CACHE_SHIFT); | |
4492 | if (eb && atomic_inc_not_zero(&eb->refs)) { | |
4493 | rcu_read_unlock(); | |
4494 | mark_extent_buffer_accessed(eb); | |
4495 | return eb; | |
4496 | } | |
4497 | rcu_read_unlock(); | |
4498 | ||
4499 | return NULL; | |
4500 | } | |
4501 | ||
d1310b2e | 4502 | struct extent_buffer *alloc_extent_buffer(struct extent_io_tree *tree, |
727011e0 | 4503 | u64 start, unsigned long len) |
d1310b2e CM |
4504 | { |
4505 | unsigned long num_pages = num_extent_pages(start, len); | |
4506 | unsigned long i; | |
4507 | unsigned long index = start >> PAGE_CACHE_SHIFT; | |
4508 | struct extent_buffer *eb; | |
6af118ce | 4509 | struct extent_buffer *exists = NULL; |
d1310b2e CM |
4510 | struct page *p; |
4511 | struct address_space *mapping = tree->mapping; | |
4512 | int uptodate = 1; | |
19fe0a8b | 4513 | int ret; |
d1310b2e | 4514 | |
452c75c3 CS |
4515 | |
4516 | eb = find_extent_buffer(tree, start); | |
4517 | if (eb) | |
6af118ce | 4518 | return eb; |
6af118ce | 4519 | |
ba144192 | 4520 | eb = __alloc_extent_buffer(tree, start, len, GFP_NOFS); |
2b114d1d | 4521 | if (!eb) |
d1310b2e CM |
4522 | return NULL; |
4523 | ||
727011e0 | 4524 | for (i = 0; i < num_pages; i++, index++) { |
a6591715 | 4525 | p = find_or_create_page(mapping, index, GFP_NOFS); |
4804b382 | 4526 | if (!p) |
6af118ce | 4527 | goto free_eb; |
4f2de97a JB |
4528 | |
4529 | spin_lock(&mapping->private_lock); | |
4530 | if (PagePrivate(p)) { | |
4531 | /* | |
4532 | * We could have already allocated an eb for this page | |
4533 | * and attached one so lets see if we can get a ref on | |
4534 | * the existing eb, and if we can we know it's good and | |
4535 | * we can just return that one, else we know we can just | |
4536 | * overwrite page->private. | |
4537 | */ | |
4538 | exists = (struct extent_buffer *)p->private; | |
4539 | if (atomic_inc_not_zero(&exists->refs)) { | |
4540 | spin_unlock(&mapping->private_lock); | |
4541 | unlock_page(p); | |
17de39ac | 4542 | page_cache_release(p); |
5df4235e | 4543 | mark_extent_buffer_accessed(exists); |
4f2de97a JB |
4544 | goto free_eb; |
4545 | } | |
4546 | ||
0b32f4bb | 4547 | /* |
4f2de97a JB |
4548 | * Do this so attach doesn't complain and we need to |
4549 | * drop the ref the old guy had. | |
4550 | */ | |
4551 | ClearPagePrivate(p); | |
0b32f4bb | 4552 | WARN_ON(PageDirty(p)); |
4f2de97a | 4553 | page_cache_release(p); |
d1310b2e | 4554 | } |
4f2de97a JB |
4555 | attach_extent_buffer_page(eb, p); |
4556 | spin_unlock(&mapping->private_lock); | |
0b32f4bb | 4557 | WARN_ON(PageDirty(p)); |
d1310b2e | 4558 | mark_page_accessed(p); |
727011e0 | 4559 | eb->pages[i] = p; |
d1310b2e CM |
4560 | if (!PageUptodate(p)) |
4561 | uptodate = 0; | |
eb14ab8e CM |
4562 | |
4563 | /* | |
4564 | * see below about how we avoid a nasty race with release page | |
4565 | * and why we unlock later | |
4566 | */ | |
d1310b2e CM |
4567 | } |
4568 | if (uptodate) | |
b4ce94de | 4569 | set_bit(EXTENT_BUFFER_UPTODATE, &eb->bflags); |
115391d2 | 4570 | again: |
19fe0a8b MX |
4571 | ret = radix_tree_preload(GFP_NOFS & ~__GFP_HIGHMEM); |
4572 | if (ret) | |
4573 | goto free_eb; | |
4574 | ||
6af118ce | 4575 | spin_lock(&tree->buffer_lock); |
19fe0a8b | 4576 | ret = radix_tree_insert(&tree->buffer, start >> PAGE_CACHE_SHIFT, eb); |
452c75c3 CS |
4577 | spin_unlock(&tree->buffer_lock); |
4578 | radix_tree_preload_end(); | |
19fe0a8b | 4579 | if (ret == -EEXIST) { |
452c75c3 CS |
4580 | exists = find_extent_buffer(tree, start); |
4581 | if (exists) | |
4582 | goto free_eb; | |
4583 | else | |
115391d2 | 4584 | goto again; |
6af118ce | 4585 | } |
6af118ce | 4586 | /* add one reference for the tree */ |
0b32f4bb | 4587 | check_buffer_tree_ref(eb); |
eb14ab8e CM |
4588 | |
4589 | /* | |
4590 | * there is a race where release page may have | |
4591 | * tried to find this extent buffer in the radix | |
4592 | * but failed. It will tell the VM it is safe to | |
4593 | * reclaim the, and it will clear the page private bit. | |
4594 | * We must make sure to set the page private bit properly | |
4595 | * after the extent buffer is in the radix tree so | |
4596 | * it doesn't get lost | |
4597 | */ | |
727011e0 CM |
4598 | SetPageChecked(eb->pages[0]); |
4599 | for (i = 1; i < num_pages; i++) { | |
4600 | p = extent_buffer_page(eb, i); | |
727011e0 CM |
4601 | ClearPageChecked(p); |
4602 | unlock_page(p); | |
4603 | } | |
4604 | unlock_page(eb->pages[0]); | |
d1310b2e CM |
4605 | return eb; |
4606 | ||
6af118ce | 4607 | free_eb: |
727011e0 CM |
4608 | for (i = 0; i < num_pages; i++) { |
4609 | if (eb->pages[i]) | |
4610 | unlock_page(eb->pages[i]); | |
4611 | } | |
eb14ab8e | 4612 | |
17de39ac | 4613 | WARN_ON(!atomic_dec_and_test(&eb->refs)); |
897ca6e9 | 4614 | btrfs_release_extent_buffer(eb); |
6af118ce | 4615 | return exists; |
d1310b2e | 4616 | } |
d1310b2e | 4617 | |
3083ee2e JB |
4618 | static inline void btrfs_release_extent_buffer_rcu(struct rcu_head *head) |
4619 | { | |
4620 | struct extent_buffer *eb = | |
4621 | container_of(head, struct extent_buffer, rcu_head); | |
4622 | ||
4623 | __free_extent_buffer(eb); | |
4624 | } | |
4625 | ||
3083ee2e | 4626 | /* Expects to have eb->eb_lock already held */ |
f7a52a40 | 4627 | static int release_extent_buffer(struct extent_buffer *eb) |
3083ee2e JB |
4628 | { |
4629 | WARN_ON(atomic_read(&eb->refs) == 0); | |
4630 | if (atomic_dec_and_test(&eb->refs)) { | |
815a51c7 JS |
4631 | if (test_bit(EXTENT_BUFFER_DUMMY, &eb->bflags)) { |
4632 | spin_unlock(&eb->refs_lock); | |
4633 | } else { | |
4634 | struct extent_io_tree *tree = eb->tree; | |
3083ee2e | 4635 | |
815a51c7 | 4636 | spin_unlock(&eb->refs_lock); |
3083ee2e | 4637 | |
815a51c7 JS |
4638 | spin_lock(&tree->buffer_lock); |
4639 | radix_tree_delete(&tree->buffer, | |
4640 | eb->start >> PAGE_CACHE_SHIFT); | |
4641 | spin_unlock(&tree->buffer_lock); | |
4642 | } | |
3083ee2e JB |
4643 | |
4644 | /* Should be safe to release our pages at this point */ | |
4645 | btrfs_release_extent_buffer_page(eb, 0); | |
3083ee2e | 4646 | call_rcu(&eb->rcu_head, btrfs_release_extent_buffer_rcu); |
e64860aa | 4647 | return 1; |
3083ee2e JB |
4648 | } |
4649 | spin_unlock(&eb->refs_lock); | |
e64860aa JB |
4650 | |
4651 | return 0; | |
3083ee2e JB |
4652 | } |
4653 | ||
d1310b2e CM |
4654 | void free_extent_buffer(struct extent_buffer *eb) |
4655 | { | |
242e18c7 CM |
4656 | int refs; |
4657 | int old; | |
d1310b2e CM |
4658 | if (!eb) |
4659 | return; | |
4660 | ||
242e18c7 CM |
4661 | while (1) { |
4662 | refs = atomic_read(&eb->refs); | |
4663 | if (refs <= 3) | |
4664 | break; | |
4665 | old = atomic_cmpxchg(&eb->refs, refs, refs - 1); | |
4666 | if (old == refs) | |
4667 | return; | |
4668 | } | |
4669 | ||
3083ee2e | 4670 | spin_lock(&eb->refs_lock); |
815a51c7 JS |
4671 | if (atomic_read(&eb->refs) == 2 && |
4672 | test_bit(EXTENT_BUFFER_DUMMY, &eb->bflags)) | |
4673 | atomic_dec(&eb->refs); | |
4674 | ||
3083ee2e JB |
4675 | if (atomic_read(&eb->refs) == 2 && |
4676 | test_bit(EXTENT_BUFFER_STALE, &eb->bflags) && | |
0b32f4bb | 4677 | !extent_buffer_under_io(eb) && |
3083ee2e JB |
4678 | test_and_clear_bit(EXTENT_BUFFER_TREE_REF, &eb->bflags)) |
4679 | atomic_dec(&eb->refs); | |
4680 | ||
4681 | /* | |
4682 | * I know this is terrible, but it's temporary until we stop tracking | |
4683 | * the uptodate bits and such for the extent buffers. | |
4684 | */ | |
f7a52a40 | 4685 | release_extent_buffer(eb); |
3083ee2e JB |
4686 | } |
4687 | ||
4688 | void free_extent_buffer_stale(struct extent_buffer *eb) | |
4689 | { | |
4690 | if (!eb) | |
d1310b2e CM |
4691 | return; |
4692 | ||
3083ee2e JB |
4693 | spin_lock(&eb->refs_lock); |
4694 | set_bit(EXTENT_BUFFER_STALE, &eb->bflags); | |
4695 | ||
0b32f4bb | 4696 | if (atomic_read(&eb->refs) == 2 && !extent_buffer_under_io(eb) && |
3083ee2e JB |
4697 | test_and_clear_bit(EXTENT_BUFFER_TREE_REF, &eb->bflags)) |
4698 | atomic_dec(&eb->refs); | |
f7a52a40 | 4699 | release_extent_buffer(eb); |
d1310b2e | 4700 | } |
d1310b2e | 4701 | |
1d4284bd | 4702 | void clear_extent_buffer_dirty(struct extent_buffer *eb) |
d1310b2e | 4703 | { |
d1310b2e CM |
4704 | unsigned long i; |
4705 | unsigned long num_pages; | |
4706 | struct page *page; | |
4707 | ||
d1310b2e CM |
4708 | num_pages = num_extent_pages(eb->start, eb->len); |
4709 | ||
4710 | for (i = 0; i < num_pages; i++) { | |
4711 | page = extent_buffer_page(eb, i); | |
b9473439 | 4712 | if (!PageDirty(page)) |
d2c3f4f6 CM |
4713 | continue; |
4714 | ||
a61e6f29 | 4715 | lock_page(page); |
eb14ab8e CM |
4716 | WARN_ON(!PagePrivate(page)); |
4717 | ||
d1310b2e | 4718 | clear_page_dirty_for_io(page); |
0ee0fda0 | 4719 | spin_lock_irq(&page->mapping->tree_lock); |
d1310b2e CM |
4720 | if (!PageDirty(page)) { |
4721 | radix_tree_tag_clear(&page->mapping->page_tree, | |
4722 | page_index(page), | |
4723 | PAGECACHE_TAG_DIRTY); | |
4724 | } | |
0ee0fda0 | 4725 | spin_unlock_irq(&page->mapping->tree_lock); |
bf0da8c1 | 4726 | ClearPageError(page); |
a61e6f29 | 4727 | unlock_page(page); |
d1310b2e | 4728 | } |
0b32f4bb | 4729 | WARN_ON(atomic_read(&eb->refs) == 0); |
d1310b2e | 4730 | } |
d1310b2e | 4731 | |
0b32f4bb | 4732 | int set_extent_buffer_dirty(struct extent_buffer *eb) |
d1310b2e CM |
4733 | { |
4734 | unsigned long i; | |
4735 | unsigned long num_pages; | |
b9473439 | 4736 | int was_dirty = 0; |
d1310b2e | 4737 | |
0b32f4bb JB |
4738 | check_buffer_tree_ref(eb); |
4739 | ||
b9473439 | 4740 | was_dirty = test_and_set_bit(EXTENT_BUFFER_DIRTY, &eb->bflags); |
0b32f4bb | 4741 | |
d1310b2e | 4742 | num_pages = num_extent_pages(eb->start, eb->len); |
3083ee2e | 4743 | WARN_ON(atomic_read(&eb->refs) == 0); |
0b32f4bb JB |
4744 | WARN_ON(!test_bit(EXTENT_BUFFER_TREE_REF, &eb->bflags)); |
4745 | ||
b9473439 | 4746 | for (i = 0; i < num_pages; i++) |
0b32f4bb | 4747 | set_page_dirty(extent_buffer_page(eb, i)); |
b9473439 | 4748 | return was_dirty; |
d1310b2e | 4749 | } |
d1310b2e | 4750 | |
0b32f4bb | 4751 | int clear_extent_buffer_uptodate(struct extent_buffer *eb) |
1259ab75 CM |
4752 | { |
4753 | unsigned long i; | |
4754 | struct page *page; | |
4755 | unsigned long num_pages; | |
4756 | ||
b4ce94de | 4757 | clear_bit(EXTENT_BUFFER_UPTODATE, &eb->bflags); |
0b32f4bb | 4758 | num_pages = num_extent_pages(eb->start, eb->len); |
1259ab75 CM |
4759 | for (i = 0; i < num_pages; i++) { |
4760 | page = extent_buffer_page(eb, i); | |
33958dc6 CM |
4761 | if (page) |
4762 | ClearPageUptodate(page); | |
1259ab75 CM |
4763 | } |
4764 | return 0; | |
4765 | } | |
4766 | ||
0b32f4bb | 4767 | int set_extent_buffer_uptodate(struct extent_buffer *eb) |
d1310b2e CM |
4768 | { |
4769 | unsigned long i; | |
4770 | struct page *page; | |
4771 | unsigned long num_pages; | |
4772 | ||
0b32f4bb | 4773 | set_bit(EXTENT_BUFFER_UPTODATE, &eb->bflags); |
d1310b2e | 4774 | num_pages = num_extent_pages(eb->start, eb->len); |
d1310b2e CM |
4775 | for (i = 0; i < num_pages; i++) { |
4776 | page = extent_buffer_page(eb, i); | |
d1310b2e CM |
4777 | SetPageUptodate(page); |
4778 | } | |
4779 | return 0; | |
4780 | } | |
d1310b2e | 4781 | |
0b32f4bb | 4782 | int extent_buffer_uptodate(struct extent_buffer *eb) |
d1310b2e | 4783 | { |
0b32f4bb | 4784 | return test_bit(EXTENT_BUFFER_UPTODATE, &eb->bflags); |
d1310b2e | 4785 | } |
d1310b2e CM |
4786 | |
4787 | int read_extent_buffer_pages(struct extent_io_tree *tree, | |
bb82ab88 | 4788 | struct extent_buffer *eb, u64 start, int wait, |
f188591e | 4789 | get_extent_t *get_extent, int mirror_num) |
d1310b2e CM |
4790 | { |
4791 | unsigned long i; | |
4792 | unsigned long start_i; | |
4793 | struct page *page; | |
4794 | int err; | |
4795 | int ret = 0; | |
ce9adaa5 CM |
4796 | int locked_pages = 0; |
4797 | int all_uptodate = 1; | |
d1310b2e | 4798 | unsigned long num_pages; |
727011e0 | 4799 | unsigned long num_reads = 0; |
a86c12c7 | 4800 | struct bio *bio = NULL; |
c8b97818 | 4801 | unsigned long bio_flags = 0; |
a86c12c7 | 4802 | |
b4ce94de | 4803 | if (test_bit(EXTENT_BUFFER_UPTODATE, &eb->bflags)) |
d1310b2e CM |
4804 | return 0; |
4805 | ||
d1310b2e CM |
4806 | if (start) { |
4807 | WARN_ON(start < eb->start); | |
4808 | start_i = (start >> PAGE_CACHE_SHIFT) - | |
4809 | (eb->start >> PAGE_CACHE_SHIFT); | |
4810 | } else { | |
4811 | start_i = 0; | |
4812 | } | |
4813 | ||
4814 | num_pages = num_extent_pages(eb->start, eb->len); | |
4815 | for (i = start_i; i < num_pages; i++) { | |
4816 | page = extent_buffer_page(eb, i); | |
bb82ab88 | 4817 | if (wait == WAIT_NONE) { |
2db04966 | 4818 | if (!trylock_page(page)) |
ce9adaa5 | 4819 | goto unlock_exit; |
d1310b2e CM |
4820 | } else { |
4821 | lock_page(page); | |
4822 | } | |
ce9adaa5 | 4823 | locked_pages++; |
727011e0 CM |
4824 | if (!PageUptodate(page)) { |
4825 | num_reads++; | |
ce9adaa5 | 4826 | all_uptodate = 0; |
727011e0 | 4827 | } |
ce9adaa5 CM |
4828 | } |
4829 | if (all_uptodate) { | |
4830 | if (start_i == 0) | |
b4ce94de | 4831 | set_bit(EXTENT_BUFFER_UPTODATE, &eb->bflags); |
ce9adaa5 CM |
4832 | goto unlock_exit; |
4833 | } | |
4834 | ||
ea466794 | 4835 | clear_bit(EXTENT_BUFFER_IOERR, &eb->bflags); |
5cf1ab56 | 4836 | eb->read_mirror = 0; |
0b32f4bb | 4837 | atomic_set(&eb->io_pages, num_reads); |
ce9adaa5 CM |
4838 | for (i = start_i; i < num_pages; i++) { |
4839 | page = extent_buffer_page(eb, i); | |
ce9adaa5 | 4840 | if (!PageUptodate(page)) { |
f188591e | 4841 | ClearPageError(page); |
a86c12c7 | 4842 | err = __extent_read_full_page(tree, page, |
f188591e | 4843 | get_extent, &bio, |
d4c7ca86 JB |
4844 | mirror_num, &bio_flags, |
4845 | READ | REQ_META); | |
d397712b | 4846 | if (err) |
d1310b2e | 4847 | ret = err; |
d1310b2e CM |
4848 | } else { |
4849 | unlock_page(page); | |
4850 | } | |
4851 | } | |
4852 | ||
355808c2 | 4853 | if (bio) { |
d4c7ca86 JB |
4854 | err = submit_one_bio(READ | REQ_META, bio, mirror_num, |
4855 | bio_flags); | |
79787eaa JM |
4856 | if (err) |
4857 | return err; | |
355808c2 | 4858 | } |
a86c12c7 | 4859 | |
bb82ab88 | 4860 | if (ret || wait != WAIT_COMPLETE) |
d1310b2e | 4861 | return ret; |
d397712b | 4862 | |
d1310b2e CM |
4863 | for (i = start_i; i < num_pages; i++) { |
4864 | page = extent_buffer_page(eb, i); | |
4865 | wait_on_page_locked(page); | |
d397712b | 4866 | if (!PageUptodate(page)) |
d1310b2e | 4867 | ret = -EIO; |
d1310b2e | 4868 | } |
d397712b | 4869 | |
d1310b2e | 4870 | return ret; |
ce9adaa5 CM |
4871 | |
4872 | unlock_exit: | |
4873 | i = start_i; | |
d397712b | 4874 | while (locked_pages > 0) { |
ce9adaa5 CM |
4875 | page = extent_buffer_page(eb, i); |
4876 | i++; | |
4877 | unlock_page(page); | |
4878 | locked_pages--; | |
4879 | } | |
4880 | return ret; | |
d1310b2e | 4881 | } |
d1310b2e CM |
4882 | |
4883 | void read_extent_buffer(struct extent_buffer *eb, void *dstv, | |
4884 | unsigned long start, | |
4885 | unsigned long len) | |
4886 | { | |
4887 | size_t cur; | |
4888 | size_t offset; | |
4889 | struct page *page; | |
4890 | char *kaddr; | |
4891 | char *dst = (char *)dstv; | |
4892 | size_t start_offset = eb->start & ((u64)PAGE_CACHE_SIZE - 1); | |
4893 | unsigned long i = (start_offset + start) >> PAGE_CACHE_SHIFT; | |
d1310b2e CM |
4894 | |
4895 | WARN_ON(start > eb->len); | |
4896 | WARN_ON(start + len > eb->start + eb->len); | |
4897 | ||
778746b5 | 4898 | offset = (start_offset + start) & (PAGE_CACHE_SIZE - 1); |
d1310b2e | 4899 | |
d397712b | 4900 | while (len > 0) { |
d1310b2e | 4901 | page = extent_buffer_page(eb, i); |
d1310b2e CM |
4902 | |
4903 | cur = min(len, (PAGE_CACHE_SIZE - offset)); | |
a6591715 | 4904 | kaddr = page_address(page); |
d1310b2e | 4905 | memcpy(dst, kaddr + offset, cur); |
d1310b2e CM |
4906 | |
4907 | dst += cur; | |
4908 | len -= cur; | |
4909 | offset = 0; | |
4910 | i++; | |
4911 | } | |
4912 | } | |
d1310b2e CM |
4913 | |
4914 | int map_private_extent_buffer(struct extent_buffer *eb, unsigned long start, | |
a6591715 | 4915 | unsigned long min_len, char **map, |
d1310b2e | 4916 | unsigned long *map_start, |
a6591715 | 4917 | unsigned long *map_len) |
d1310b2e CM |
4918 | { |
4919 | size_t offset = start & (PAGE_CACHE_SIZE - 1); | |
4920 | char *kaddr; | |
4921 | struct page *p; | |
4922 | size_t start_offset = eb->start & ((u64)PAGE_CACHE_SIZE - 1); | |
4923 | unsigned long i = (start_offset + start) >> PAGE_CACHE_SHIFT; | |
4924 | unsigned long end_i = (start_offset + start + min_len - 1) >> | |
4925 | PAGE_CACHE_SHIFT; | |
4926 | ||
4927 | if (i != end_i) | |
4928 | return -EINVAL; | |
4929 | ||
4930 | if (i == 0) { | |
4931 | offset = start_offset; | |
4932 | *map_start = 0; | |
4933 | } else { | |
4934 | offset = 0; | |
4935 | *map_start = ((u64)i << PAGE_CACHE_SHIFT) - start_offset; | |
4936 | } | |
d397712b | 4937 | |
d1310b2e | 4938 | if (start + min_len > eb->len) { |
31b1a2bd | 4939 | WARN(1, KERN_ERR "btrfs bad mapping eb start %llu len %lu, " |
c1c9ff7c GU |
4940 | "wanted %lu %lu\n", |
4941 | eb->start, eb->len, start, min_len); | |
85026533 | 4942 | return -EINVAL; |
d1310b2e CM |
4943 | } |
4944 | ||
4945 | p = extent_buffer_page(eb, i); | |
a6591715 | 4946 | kaddr = page_address(p); |
d1310b2e CM |
4947 | *map = kaddr + offset; |
4948 | *map_len = PAGE_CACHE_SIZE - offset; | |
4949 | return 0; | |
4950 | } | |
d1310b2e | 4951 | |
d1310b2e CM |
4952 | int memcmp_extent_buffer(struct extent_buffer *eb, const void *ptrv, |
4953 | unsigned long start, | |
4954 | unsigned long len) | |
4955 | { | |
4956 | size_t cur; | |
4957 | size_t offset; | |
4958 | struct page *page; | |
4959 | char *kaddr; | |
4960 | char *ptr = (char *)ptrv; | |
4961 | size_t start_offset = eb->start & ((u64)PAGE_CACHE_SIZE - 1); | |
4962 | unsigned long i = (start_offset + start) >> PAGE_CACHE_SHIFT; | |
4963 | int ret = 0; | |
4964 | ||
4965 | WARN_ON(start > eb->len); | |
4966 | WARN_ON(start + len > eb->start + eb->len); | |
4967 | ||
778746b5 | 4968 | offset = (start_offset + start) & (PAGE_CACHE_SIZE - 1); |
d1310b2e | 4969 | |
d397712b | 4970 | while (len > 0) { |
d1310b2e | 4971 | page = extent_buffer_page(eb, i); |
d1310b2e CM |
4972 | |
4973 | cur = min(len, (PAGE_CACHE_SIZE - offset)); | |
4974 | ||
a6591715 | 4975 | kaddr = page_address(page); |
d1310b2e | 4976 | ret = memcmp(ptr, kaddr + offset, cur); |
d1310b2e CM |
4977 | if (ret) |
4978 | break; | |
4979 | ||
4980 | ptr += cur; | |
4981 | len -= cur; | |
4982 | offset = 0; | |
4983 | i++; | |
4984 | } | |
4985 | return ret; | |
4986 | } | |
d1310b2e CM |
4987 | |
4988 | void write_extent_buffer(struct extent_buffer *eb, const void *srcv, | |
4989 | unsigned long start, unsigned long len) | |
4990 | { | |
4991 | size_t cur; | |
4992 | size_t offset; | |
4993 | struct page *page; | |
4994 | char *kaddr; | |
4995 | char *src = (char *)srcv; | |
4996 | size_t start_offset = eb->start & ((u64)PAGE_CACHE_SIZE - 1); | |
4997 | unsigned long i = (start_offset + start) >> PAGE_CACHE_SHIFT; | |
4998 | ||
4999 | WARN_ON(start > eb->len); | |
5000 | WARN_ON(start + len > eb->start + eb->len); | |
5001 | ||
778746b5 | 5002 | offset = (start_offset + start) & (PAGE_CACHE_SIZE - 1); |
d1310b2e | 5003 | |
d397712b | 5004 | while (len > 0) { |
d1310b2e CM |
5005 | page = extent_buffer_page(eb, i); |
5006 | WARN_ON(!PageUptodate(page)); | |
5007 | ||
5008 | cur = min(len, PAGE_CACHE_SIZE - offset); | |
a6591715 | 5009 | kaddr = page_address(page); |
d1310b2e | 5010 | memcpy(kaddr + offset, src, cur); |
d1310b2e CM |
5011 | |
5012 | src += cur; | |
5013 | len -= cur; | |
5014 | offset = 0; | |
5015 | i++; | |
5016 | } | |
5017 | } | |
d1310b2e CM |
5018 | |
5019 | void memset_extent_buffer(struct extent_buffer *eb, char c, | |
5020 | unsigned long start, unsigned long len) | |
5021 | { | |
5022 | size_t cur; | |
5023 | size_t offset; | |
5024 | struct page *page; | |
5025 | char *kaddr; | |
5026 | size_t start_offset = eb->start & ((u64)PAGE_CACHE_SIZE - 1); | |
5027 | unsigned long i = (start_offset + start) >> PAGE_CACHE_SHIFT; | |
5028 | ||
5029 | WARN_ON(start > eb->len); | |
5030 | WARN_ON(start + len > eb->start + eb->len); | |
5031 | ||
778746b5 | 5032 | offset = (start_offset + start) & (PAGE_CACHE_SIZE - 1); |
d1310b2e | 5033 | |
d397712b | 5034 | while (len > 0) { |
d1310b2e CM |
5035 | page = extent_buffer_page(eb, i); |
5036 | WARN_ON(!PageUptodate(page)); | |
5037 | ||
5038 | cur = min(len, PAGE_CACHE_SIZE - offset); | |
a6591715 | 5039 | kaddr = page_address(page); |
d1310b2e | 5040 | memset(kaddr + offset, c, cur); |
d1310b2e CM |
5041 | |
5042 | len -= cur; | |
5043 | offset = 0; | |
5044 | i++; | |
5045 | } | |
5046 | } | |
d1310b2e CM |
5047 | |
5048 | void copy_extent_buffer(struct extent_buffer *dst, struct extent_buffer *src, | |
5049 | unsigned long dst_offset, unsigned long src_offset, | |
5050 | unsigned long len) | |
5051 | { | |
5052 | u64 dst_len = dst->len; | |
5053 | size_t cur; | |
5054 | size_t offset; | |
5055 | struct page *page; | |
5056 | char *kaddr; | |
5057 | size_t start_offset = dst->start & ((u64)PAGE_CACHE_SIZE - 1); | |
5058 | unsigned long i = (start_offset + dst_offset) >> PAGE_CACHE_SHIFT; | |
5059 | ||
5060 | WARN_ON(src->len != dst_len); | |
5061 | ||
5062 | offset = (start_offset + dst_offset) & | |
778746b5 | 5063 | (PAGE_CACHE_SIZE - 1); |
d1310b2e | 5064 | |
d397712b | 5065 | while (len > 0) { |
d1310b2e CM |
5066 | page = extent_buffer_page(dst, i); |
5067 | WARN_ON(!PageUptodate(page)); | |
5068 | ||
5069 | cur = min(len, (unsigned long)(PAGE_CACHE_SIZE - offset)); | |
5070 | ||
a6591715 | 5071 | kaddr = page_address(page); |
d1310b2e | 5072 | read_extent_buffer(src, kaddr + offset, src_offset, cur); |
d1310b2e CM |
5073 | |
5074 | src_offset += cur; | |
5075 | len -= cur; | |
5076 | offset = 0; | |
5077 | i++; | |
5078 | } | |
5079 | } | |
d1310b2e | 5080 | |
3387206f ST |
5081 | static inline bool areas_overlap(unsigned long src, unsigned long dst, unsigned long len) |
5082 | { | |
5083 | unsigned long distance = (src > dst) ? src - dst : dst - src; | |
5084 | return distance < len; | |
5085 | } | |
5086 | ||
d1310b2e CM |
5087 | static void copy_pages(struct page *dst_page, struct page *src_page, |
5088 | unsigned long dst_off, unsigned long src_off, | |
5089 | unsigned long len) | |
5090 | { | |
a6591715 | 5091 | char *dst_kaddr = page_address(dst_page); |
d1310b2e | 5092 | char *src_kaddr; |
727011e0 | 5093 | int must_memmove = 0; |
d1310b2e | 5094 | |
3387206f | 5095 | if (dst_page != src_page) { |
a6591715 | 5096 | src_kaddr = page_address(src_page); |
3387206f | 5097 | } else { |
d1310b2e | 5098 | src_kaddr = dst_kaddr; |
727011e0 CM |
5099 | if (areas_overlap(src_off, dst_off, len)) |
5100 | must_memmove = 1; | |
3387206f | 5101 | } |
d1310b2e | 5102 | |
727011e0 CM |
5103 | if (must_memmove) |
5104 | memmove(dst_kaddr + dst_off, src_kaddr + src_off, len); | |
5105 | else | |
5106 | memcpy(dst_kaddr + dst_off, src_kaddr + src_off, len); | |
d1310b2e CM |
5107 | } |
5108 | ||
5109 | void memcpy_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset, | |
5110 | unsigned long src_offset, unsigned long len) | |
5111 | { | |
5112 | size_t cur; | |
5113 | size_t dst_off_in_page; | |
5114 | size_t src_off_in_page; | |
5115 | size_t start_offset = dst->start & ((u64)PAGE_CACHE_SIZE - 1); | |
5116 | unsigned long dst_i; | |
5117 | unsigned long src_i; | |
5118 | ||
5119 | if (src_offset + len > dst->len) { | |
d397712b CM |
5120 | printk(KERN_ERR "btrfs memmove bogus src_offset %lu move " |
5121 | "len %lu dst len %lu\n", src_offset, len, dst->len); | |
d1310b2e CM |
5122 | BUG_ON(1); |
5123 | } | |
5124 | if (dst_offset + len > dst->len) { | |
d397712b CM |
5125 | printk(KERN_ERR "btrfs memmove bogus dst_offset %lu move " |
5126 | "len %lu dst len %lu\n", dst_offset, len, dst->len); | |
d1310b2e CM |
5127 | BUG_ON(1); |
5128 | } | |
5129 | ||
d397712b | 5130 | while (len > 0) { |
d1310b2e | 5131 | dst_off_in_page = (start_offset + dst_offset) & |
778746b5 | 5132 | (PAGE_CACHE_SIZE - 1); |
d1310b2e | 5133 | src_off_in_page = (start_offset + src_offset) & |
778746b5 | 5134 | (PAGE_CACHE_SIZE - 1); |
d1310b2e CM |
5135 | |
5136 | dst_i = (start_offset + dst_offset) >> PAGE_CACHE_SHIFT; | |
5137 | src_i = (start_offset + src_offset) >> PAGE_CACHE_SHIFT; | |
5138 | ||
5139 | cur = min(len, (unsigned long)(PAGE_CACHE_SIZE - | |
5140 | src_off_in_page)); | |
5141 | cur = min_t(unsigned long, cur, | |
5142 | (unsigned long)(PAGE_CACHE_SIZE - dst_off_in_page)); | |
5143 | ||
5144 | copy_pages(extent_buffer_page(dst, dst_i), | |
5145 | extent_buffer_page(dst, src_i), | |
5146 | dst_off_in_page, src_off_in_page, cur); | |
5147 | ||
5148 | src_offset += cur; | |
5149 | dst_offset += cur; | |
5150 | len -= cur; | |
5151 | } | |
5152 | } | |
d1310b2e CM |
5153 | |
5154 | void memmove_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset, | |
5155 | unsigned long src_offset, unsigned long len) | |
5156 | { | |
5157 | size_t cur; | |
5158 | size_t dst_off_in_page; | |
5159 | size_t src_off_in_page; | |
5160 | unsigned long dst_end = dst_offset + len - 1; | |
5161 | unsigned long src_end = src_offset + len - 1; | |
5162 | size_t start_offset = dst->start & ((u64)PAGE_CACHE_SIZE - 1); | |
5163 | unsigned long dst_i; | |
5164 | unsigned long src_i; | |
5165 | ||
5166 | if (src_offset + len > dst->len) { | |
d397712b CM |
5167 | printk(KERN_ERR "btrfs memmove bogus src_offset %lu move " |
5168 | "len %lu len %lu\n", src_offset, len, dst->len); | |
d1310b2e CM |
5169 | BUG_ON(1); |
5170 | } | |
5171 | if (dst_offset + len > dst->len) { | |
d397712b CM |
5172 | printk(KERN_ERR "btrfs memmove bogus dst_offset %lu move " |
5173 | "len %lu len %lu\n", dst_offset, len, dst->len); | |
d1310b2e CM |
5174 | BUG_ON(1); |
5175 | } | |
727011e0 | 5176 | if (dst_offset < src_offset) { |
d1310b2e CM |
5177 | memcpy_extent_buffer(dst, dst_offset, src_offset, len); |
5178 | return; | |
5179 | } | |
d397712b | 5180 | while (len > 0) { |
d1310b2e CM |
5181 | dst_i = (start_offset + dst_end) >> PAGE_CACHE_SHIFT; |
5182 | src_i = (start_offset + src_end) >> PAGE_CACHE_SHIFT; | |
5183 | ||
5184 | dst_off_in_page = (start_offset + dst_end) & | |
778746b5 | 5185 | (PAGE_CACHE_SIZE - 1); |
d1310b2e | 5186 | src_off_in_page = (start_offset + src_end) & |
778746b5 | 5187 | (PAGE_CACHE_SIZE - 1); |
d1310b2e CM |
5188 | |
5189 | cur = min_t(unsigned long, len, src_off_in_page + 1); | |
5190 | cur = min(cur, dst_off_in_page + 1); | |
1877e1a7 | 5191 | copy_pages(extent_buffer_page(dst, dst_i), |
d1310b2e CM |
5192 | extent_buffer_page(dst, src_i), |
5193 | dst_off_in_page - cur + 1, | |
5194 | src_off_in_page - cur + 1, cur); | |
5195 | ||
5196 | dst_end -= cur; | |
5197 | src_end -= cur; | |
5198 | len -= cur; | |
5199 | } | |
5200 | } | |
6af118ce | 5201 | |
f7a52a40 | 5202 | int try_release_extent_buffer(struct page *page) |
19fe0a8b | 5203 | { |
6af118ce | 5204 | struct extent_buffer *eb; |
6af118ce | 5205 | |
3083ee2e JB |
5206 | /* |
5207 | * We need to make sure noboody is attaching this page to an eb right | |
5208 | * now. | |
5209 | */ | |
5210 | spin_lock(&page->mapping->private_lock); | |
5211 | if (!PagePrivate(page)) { | |
5212 | spin_unlock(&page->mapping->private_lock); | |
4f2de97a | 5213 | return 1; |
45f49bce | 5214 | } |
6af118ce | 5215 | |
3083ee2e JB |
5216 | eb = (struct extent_buffer *)page->private; |
5217 | BUG_ON(!eb); | |
19fe0a8b MX |
5218 | |
5219 | /* | |
3083ee2e JB |
5220 | * This is a little awful but should be ok, we need to make sure that |
5221 | * the eb doesn't disappear out from under us while we're looking at | |
5222 | * this page. | |
19fe0a8b | 5223 | */ |
3083ee2e | 5224 | spin_lock(&eb->refs_lock); |
0b32f4bb | 5225 | if (atomic_read(&eb->refs) != 1 || extent_buffer_under_io(eb)) { |
3083ee2e JB |
5226 | spin_unlock(&eb->refs_lock); |
5227 | spin_unlock(&page->mapping->private_lock); | |
5228 | return 0; | |
b9473439 | 5229 | } |
3083ee2e | 5230 | spin_unlock(&page->mapping->private_lock); |
897ca6e9 | 5231 | |
19fe0a8b | 5232 | /* |
3083ee2e JB |
5233 | * If tree ref isn't set then we know the ref on this eb is a real ref, |
5234 | * so just return, this page will likely be freed soon anyway. | |
19fe0a8b | 5235 | */ |
3083ee2e JB |
5236 | if (!test_and_clear_bit(EXTENT_BUFFER_TREE_REF, &eb->bflags)) { |
5237 | spin_unlock(&eb->refs_lock); | |
5238 | return 0; | |
b9473439 | 5239 | } |
19fe0a8b | 5240 | |
f7a52a40 | 5241 | return release_extent_buffer(eb); |
6af118ce | 5242 | } |