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" | |
2db04966 | 16 | #include "compat.h" |
902b22f3 DW |
17 | #include "ctree.h" |
18 | #include "btrfs_inode.h" | |
4a54c8c1 | 19 | #include "volumes.h" |
21adbd5c | 20 | #include "check-integrity.h" |
0b32f4bb | 21 | #include "locking.h" |
606686ee | 22 | #include "rcu-string.h" |
d1310b2e | 23 | |
d1310b2e CM |
24 | static struct kmem_cache *extent_state_cache; |
25 | static struct kmem_cache *extent_buffer_cache; | |
26 | ||
6d49ba1b | 27 | #ifdef CONFIG_BTRFS_DEBUG |
d1310b2e CM |
28 | static LIST_HEAD(buffers); |
29 | static LIST_HEAD(states); | |
4bef0848 | 30 | |
d397712b | 31 | static DEFINE_SPINLOCK(leak_lock); |
6d49ba1b ES |
32 | |
33 | static inline | |
34 | void btrfs_leak_debug_add(struct list_head *new, struct list_head *head) | |
35 | { | |
36 | unsigned long flags; | |
37 | ||
38 | spin_lock_irqsave(&leak_lock, flags); | |
39 | list_add(new, head); | |
40 | spin_unlock_irqrestore(&leak_lock, flags); | |
41 | } | |
42 | ||
43 | static inline | |
44 | void btrfs_leak_debug_del(struct list_head *entry) | |
45 | { | |
46 | unsigned long flags; | |
47 | ||
48 | spin_lock_irqsave(&leak_lock, flags); | |
49 | list_del(entry); | |
50 | spin_unlock_irqrestore(&leak_lock, flags); | |
51 | } | |
52 | ||
53 | static inline | |
54 | void btrfs_leak_debug_check(void) | |
55 | { | |
56 | struct extent_state *state; | |
57 | struct extent_buffer *eb; | |
58 | ||
59 | while (!list_empty(&states)) { | |
60 | state = list_entry(states.next, struct extent_state, leak_list); | |
61 | printk(KERN_ERR "btrfs state leak: start %llu end %llu " | |
62 | "state %lu in tree %p refs %d\n", | |
63 | (unsigned long long)state->start, | |
64 | (unsigned long long)state->end, | |
65 | state->state, state->tree, atomic_read(&state->refs)); | |
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 " | |
73 | "refs %d\n", (unsigned long long)eb->start, | |
74 | eb->len, atomic_read(&eb->refs)); | |
75 | list_del(&eb->leak_list); | |
76 | kmem_cache_free(extent_buffer_cache, eb); | |
77 | } | |
78 | } | |
79 | #else | |
80 | #define btrfs_leak_debug_add(new, head) do {} while (0) | |
81 | #define btrfs_leak_debug_del(entry) do {} while (0) | |
82 | #define btrfs_leak_debug_check() do {} while (0) | |
4bef0848 | 83 | #endif |
d1310b2e | 84 | |
d1310b2e CM |
85 | #define BUFFER_LRU_MAX 64 |
86 | ||
87 | struct tree_entry { | |
88 | u64 start; | |
89 | u64 end; | |
d1310b2e CM |
90 | struct rb_node rb_node; |
91 | }; | |
92 | ||
93 | struct extent_page_data { | |
94 | struct bio *bio; | |
95 | struct extent_io_tree *tree; | |
96 | get_extent_t *get_extent; | |
de0022b9 | 97 | unsigned long bio_flags; |
771ed689 CM |
98 | |
99 | /* tells writepage not to lock the state bits for this range | |
100 | * it still does the unlocking | |
101 | */ | |
ffbd517d CM |
102 | unsigned int extent_locked:1; |
103 | ||
104 | /* tells the submit_bio code to use a WRITE_SYNC */ | |
105 | unsigned int sync_io:1; | |
d1310b2e CM |
106 | }; |
107 | ||
0b32f4bb | 108 | static noinline void flush_write_bio(void *data); |
c2d904e0 JM |
109 | static inline struct btrfs_fs_info * |
110 | tree_fs_info(struct extent_io_tree *tree) | |
111 | { | |
112 | return btrfs_sb(tree->mapping->host->i_sb); | |
113 | } | |
0b32f4bb | 114 | |
d1310b2e CM |
115 | int __init extent_io_init(void) |
116 | { | |
837e1972 | 117 | extent_state_cache = kmem_cache_create("btrfs_extent_state", |
9601e3f6 CH |
118 | sizeof(struct extent_state), 0, |
119 | SLAB_RECLAIM_ACCOUNT | SLAB_MEM_SPREAD, NULL); | |
d1310b2e CM |
120 | if (!extent_state_cache) |
121 | return -ENOMEM; | |
122 | ||
837e1972 | 123 | extent_buffer_cache = kmem_cache_create("btrfs_extent_buffer", |
9601e3f6 CH |
124 | sizeof(struct extent_buffer), 0, |
125 | SLAB_RECLAIM_ACCOUNT | SLAB_MEM_SPREAD, NULL); | |
d1310b2e CM |
126 | if (!extent_buffer_cache) |
127 | goto free_state_cache; | |
128 | return 0; | |
129 | ||
130 | free_state_cache: | |
131 | kmem_cache_destroy(extent_state_cache); | |
132 | return -ENOMEM; | |
133 | } | |
134 | ||
135 | void extent_io_exit(void) | |
136 | { | |
6d49ba1b | 137 | btrfs_leak_debug_check(); |
8c0a8537 KS |
138 | |
139 | /* | |
140 | * Make sure all delayed rcu free are flushed before we | |
141 | * destroy caches. | |
142 | */ | |
143 | rcu_barrier(); | |
d1310b2e CM |
144 | if (extent_state_cache) |
145 | kmem_cache_destroy(extent_state_cache); | |
146 | if (extent_buffer_cache) | |
147 | kmem_cache_destroy(extent_buffer_cache); | |
148 | } | |
149 | ||
150 | void extent_io_tree_init(struct extent_io_tree *tree, | |
f993c883 | 151 | struct address_space *mapping) |
d1310b2e | 152 | { |
6bef4d31 | 153 | tree->state = RB_ROOT; |
19fe0a8b | 154 | INIT_RADIX_TREE(&tree->buffer, GFP_ATOMIC); |
d1310b2e CM |
155 | tree->ops = NULL; |
156 | tree->dirty_bytes = 0; | |
70dec807 | 157 | spin_lock_init(&tree->lock); |
6af118ce | 158 | spin_lock_init(&tree->buffer_lock); |
d1310b2e | 159 | tree->mapping = mapping; |
d1310b2e | 160 | } |
d1310b2e | 161 | |
b2950863 | 162 | static struct extent_state *alloc_extent_state(gfp_t mask) |
d1310b2e CM |
163 | { |
164 | struct extent_state *state; | |
d1310b2e CM |
165 | |
166 | state = kmem_cache_alloc(extent_state_cache, mask); | |
2b114d1d | 167 | if (!state) |
d1310b2e CM |
168 | return state; |
169 | state->state = 0; | |
d1310b2e | 170 | state->private = 0; |
70dec807 | 171 | state->tree = NULL; |
6d49ba1b | 172 | btrfs_leak_debug_add(&state->leak_list, &states); |
d1310b2e CM |
173 | atomic_set(&state->refs, 1); |
174 | init_waitqueue_head(&state->wq); | |
143bede5 | 175 | trace_alloc_extent_state(state, mask, _RET_IP_); |
d1310b2e CM |
176 | return state; |
177 | } | |
d1310b2e | 178 | |
4845e44f | 179 | void free_extent_state(struct extent_state *state) |
d1310b2e | 180 | { |
d1310b2e CM |
181 | if (!state) |
182 | return; | |
183 | if (atomic_dec_and_test(&state->refs)) { | |
70dec807 | 184 | WARN_ON(state->tree); |
6d49ba1b | 185 | btrfs_leak_debug_del(&state->leak_list); |
143bede5 | 186 | trace_free_extent_state(state, _RET_IP_); |
d1310b2e CM |
187 | kmem_cache_free(extent_state_cache, state); |
188 | } | |
189 | } | |
d1310b2e CM |
190 | |
191 | static struct rb_node *tree_insert(struct rb_root *root, u64 offset, | |
192 | struct rb_node *node) | |
193 | { | |
d397712b CM |
194 | struct rb_node **p = &root->rb_node; |
195 | struct rb_node *parent = NULL; | |
d1310b2e CM |
196 | struct tree_entry *entry; |
197 | ||
d397712b | 198 | while (*p) { |
d1310b2e CM |
199 | parent = *p; |
200 | entry = rb_entry(parent, struct tree_entry, rb_node); | |
201 | ||
202 | if (offset < entry->start) | |
203 | p = &(*p)->rb_left; | |
204 | else if (offset > entry->end) | |
205 | p = &(*p)->rb_right; | |
206 | else | |
207 | return parent; | |
208 | } | |
209 | ||
d1310b2e CM |
210 | rb_link_node(node, parent, p); |
211 | rb_insert_color(node, root); | |
212 | return NULL; | |
213 | } | |
214 | ||
80ea96b1 | 215 | static struct rb_node *__etree_search(struct extent_io_tree *tree, u64 offset, |
d1310b2e CM |
216 | struct rb_node **prev_ret, |
217 | struct rb_node **next_ret) | |
218 | { | |
80ea96b1 | 219 | struct rb_root *root = &tree->state; |
d397712b | 220 | struct rb_node *n = root->rb_node; |
d1310b2e CM |
221 | struct rb_node *prev = NULL; |
222 | struct rb_node *orig_prev = NULL; | |
223 | struct tree_entry *entry; | |
224 | struct tree_entry *prev_entry = NULL; | |
225 | ||
d397712b | 226 | while (n) { |
d1310b2e CM |
227 | entry = rb_entry(n, struct tree_entry, rb_node); |
228 | prev = n; | |
229 | prev_entry = entry; | |
230 | ||
231 | if (offset < entry->start) | |
232 | n = n->rb_left; | |
233 | else if (offset > entry->end) | |
234 | n = n->rb_right; | |
d397712b | 235 | else |
d1310b2e CM |
236 | return n; |
237 | } | |
238 | ||
239 | if (prev_ret) { | |
240 | orig_prev = prev; | |
d397712b | 241 | while (prev && offset > prev_entry->end) { |
d1310b2e CM |
242 | prev = rb_next(prev); |
243 | prev_entry = rb_entry(prev, struct tree_entry, rb_node); | |
244 | } | |
245 | *prev_ret = prev; | |
246 | prev = orig_prev; | |
247 | } | |
248 | ||
249 | if (next_ret) { | |
250 | prev_entry = rb_entry(prev, struct tree_entry, rb_node); | |
d397712b | 251 | while (prev && offset < prev_entry->start) { |
d1310b2e CM |
252 | prev = rb_prev(prev); |
253 | prev_entry = rb_entry(prev, struct tree_entry, rb_node); | |
254 | } | |
255 | *next_ret = prev; | |
256 | } | |
257 | return NULL; | |
258 | } | |
259 | ||
80ea96b1 CM |
260 | static inline struct rb_node *tree_search(struct extent_io_tree *tree, |
261 | u64 offset) | |
d1310b2e | 262 | { |
70dec807 | 263 | struct rb_node *prev = NULL; |
d1310b2e | 264 | struct rb_node *ret; |
70dec807 | 265 | |
80ea96b1 | 266 | ret = __etree_search(tree, offset, &prev, NULL); |
d397712b | 267 | if (!ret) |
d1310b2e CM |
268 | return prev; |
269 | return ret; | |
270 | } | |
271 | ||
9ed74f2d JB |
272 | static void merge_cb(struct extent_io_tree *tree, struct extent_state *new, |
273 | struct extent_state *other) | |
274 | { | |
275 | if (tree->ops && tree->ops->merge_extent_hook) | |
276 | tree->ops->merge_extent_hook(tree->mapping->host, new, | |
277 | other); | |
278 | } | |
279 | ||
d1310b2e CM |
280 | /* |
281 | * utility function to look for merge candidates inside a given range. | |
282 | * Any extents with matching state are merged together into a single | |
283 | * extent in the tree. Extents with EXTENT_IO in their state field | |
284 | * are not merged because the end_io handlers need to be able to do | |
285 | * operations on them without sleeping (or doing allocations/splits). | |
286 | * | |
287 | * This should be called with the tree lock held. | |
288 | */ | |
1bf85046 JM |
289 | static void merge_state(struct extent_io_tree *tree, |
290 | struct extent_state *state) | |
d1310b2e CM |
291 | { |
292 | struct extent_state *other; | |
293 | struct rb_node *other_node; | |
294 | ||
5b21f2ed | 295 | if (state->state & (EXTENT_IOBITS | EXTENT_BOUNDARY)) |
1bf85046 | 296 | return; |
d1310b2e CM |
297 | |
298 | other_node = rb_prev(&state->rb_node); | |
299 | if (other_node) { | |
300 | other = rb_entry(other_node, struct extent_state, rb_node); | |
301 | if (other->end == state->start - 1 && | |
302 | other->state == state->state) { | |
9ed74f2d | 303 | merge_cb(tree, state, other); |
d1310b2e | 304 | state->start = other->start; |
70dec807 | 305 | other->tree = NULL; |
d1310b2e CM |
306 | rb_erase(&other->rb_node, &tree->state); |
307 | free_extent_state(other); | |
308 | } | |
309 | } | |
310 | other_node = rb_next(&state->rb_node); | |
311 | if (other_node) { | |
312 | other = rb_entry(other_node, struct extent_state, rb_node); | |
313 | if (other->start == state->end + 1 && | |
314 | other->state == state->state) { | |
9ed74f2d | 315 | merge_cb(tree, state, other); |
df98b6e2 JB |
316 | state->end = other->end; |
317 | other->tree = NULL; | |
318 | rb_erase(&other->rb_node, &tree->state); | |
319 | free_extent_state(other); | |
d1310b2e CM |
320 | } |
321 | } | |
d1310b2e CM |
322 | } |
323 | ||
1bf85046 | 324 | static void set_state_cb(struct extent_io_tree *tree, |
41074888 | 325 | struct extent_state *state, unsigned long *bits) |
291d673e | 326 | { |
1bf85046 JM |
327 | if (tree->ops && tree->ops->set_bit_hook) |
328 | tree->ops->set_bit_hook(tree->mapping->host, state, bits); | |
291d673e CM |
329 | } |
330 | ||
331 | static void clear_state_cb(struct extent_io_tree *tree, | |
41074888 | 332 | struct extent_state *state, unsigned long *bits) |
291d673e | 333 | { |
9ed74f2d JB |
334 | if (tree->ops && tree->ops->clear_bit_hook) |
335 | tree->ops->clear_bit_hook(tree->mapping->host, state, bits); | |
291d673e CM |
336 | } |
337 | ||
3150b699 | 338 | static void set_state_bits(struct extent_io_tree *tree, |
41074888 | 339 | struct extent_state *state, unsigned long *bits); |
3150b699 | 340 | |
d1310b2e CM |
341 | /* |
342 | * insert an extent_state struct into the tree. 'bits' are set on the | |
343 | * struct before it is inserted. | |
344 | * | |
345 | * This may return -EEXIST if the extent is already there, in which case the | |
346 | * state struct is freed. | |
347 | * | |
348 | * The tree lock is not taken internally. This is a utility function and | |
349 | * probably isn't what you want to call (see set/clear_extent_bit). | |
350 | */ | |
351 | static int insert_state(struct extent_io_tree *tree, | |
352 | struct extent_state *state, u64 start, u64 end, | |
41074888 | 353 | unsigned long *bits) |
d1310b2e CM |
354 | { |
355 | struct rb_node *node; | |
356 | ||
31b1a2bd JL |
357 | if (end < start) |
358 | WARN(1, KERN_ERR "btrfs end < start %llu %llu\n", | |
d397712b CM |
359 | (unsigned long long)end, |
360 | (unsigned long long)start); | |
d1310b2e CM |
361 | state->start = start; |
362 | state->end = end; | |
9ed74f2d | 363 | |
3150b699 XG |
364 | set_state_bits(tree, state, bits); |
365 | ||
d1310b2e CM |
366 | node = tree_insert(&tree->state, end, &state->rb_node); |
367 | if (node) { | |
368 | struct extent_state *found; | |
369 | found = rb_entry(node, struct extent_state, rb_node); | |
d397712b CM |
370 | printk(KERN_ERR "btrfs found node %llu %llu on insert of " |
371 | "%llu %llu\n", (unsigned long long)found->start, | |
372 | (unsigned long long)found->end, | |
373 | (unsigned long long)start, (unsigned long long)end); | |
d1310b2e CM |
374 | return -EEXIST; |
375 | } | |
70dec807 | 376 | state->tree = tree; |
d1310b2e CM |
377 | merge_state(tree, state); |
378 | return 0; | |
379 | } | |
380 | ||
1bf85046 | 381 | static void split_cb(struct extent_io_tree *tree, struct extent_state *orig, |
9ed74f2d JB |
382 | u64 split) |
383 | { | |
384 | if (tree->ops && tree->ops->split_extent_hook) | |
1bf85046 | 385 | tree->ops->split_extent_hook(tree->mapping->host, orig, split); |
9ed74f2d JB |
386 | } |
387 | ||
d1310b2e CM |
388 | /* |
389 | * split a given extent state struct in two, inserting the preallocated | |
390 | * struct 'prealloc' as the newly created second half. 'split' indicates an | |
391 | * offset inside 'orig' where it should be split. | |
392 | * | |
393 | * Before calling, | |
394 | * the tree has 'orig' at [orig->start, orig->end]. After calling, there | |
395 | * are two extent state structs in the tree: | |
396 | * prealloc: [orig->start, split - 1] | |
397 | * orig: [ split, orig->end ] | |
398 | * | |
399 | * The tree locks are not taken by this function. They need to be held | |
400 | * by the caller. | |
401 | */ | |
402 | static int split_state(struct extent_io_tree *tree, struct extent_state *orig, | |
403 | struct extent_state *prealloc, u64 split) | |
404 | { | |
405 | struct rb_node *node; | |
9ed74f2d JB |
406 | |
407 | split_cb(tree, orig, split); | |
408 | ||
d1310b2e CM |
409 | prealloc->start = orig->start; |
410 | prealloc->end = split - 1; | |
411 | prealloc->state = orig->state; | |
412 | orig->start = split; | |
413 | ||
414 | node = tree_insert(&tree->state, prealloc->end, &prealloc->rb_node); | |
415 | if (node) { | |
d1310b2e CM |
416 | free_extent_state(prealloc); |
417 | return -EEXIST; | |
418 | } | |
70dec807 | 419 | prealloc->tree = tree; |
d1310b2e CM |
420 | return 0; |
421 | } | |
422 | ||
cdc6a395 LZ |
423 | static struct extent_state *next_state(struct extent_state *state) |
424 | { | |
425 | struct rb_node *next = rb_next(&state->rb_node); | |
426 | if (next) | |
427 | return rb_entry(next, struct extent_state, rb_node); | |
428 | else | |
429 | return NULL; | |
430 | } | |
431 | ||
d1310b2e CM |
432 | /* |
433 | * utility function to clear some bits in an extent state struct. | |
1b303fc0 | 434 | * it will optionally wake up any one waiting on this state (wake == 1). |
d1310b2e CM |
435 | * |
436 | * If no bits are set on the state struct after clearing things, the | |
437 | * struct is freed and removed from the tree | |
438 | */ | |
cdc6a395 LZ |
439 | static struct extent_state *clear_state_bit(struct extent_io_tree *tree, |
440 | struct extent_state *state, | |
41074888 | 441 | unsigned long *bits, int wake) |
d1310b2e | 442 | { |
cdc6a395 | 443 | struct extent_state *next; |
41074888 | 444 | unsigned long bits_to_clear = *bits & ~EXTENT_CTLBITS; |
d1310b2e | 445 | |
0ca1f7ce | 446 | if ((bits_to_clear & EXTENT_DIRTY) && (state->state & EXTENT_DIRTY)) { |
d1310b2e CM |
447 | u64 range = state->end - state->start + 1; |
448 | WARN_ON(range > tree->dirty_bytes); | |
449 | tree->dirty_bytes -= range; | |
450 | } | |
291d673e | 451 | clear_state_cb(tree, state, bits); |
32c00aff | 452 | state->state &= ~bits_to_clear; |
d1310b2e CM |
453 | if (wake) |
454 | wake_up(&state->wq); | |
0ca1f7ce | 455 | if (state->state == 0) { |
cdc6a395 | 456 | next = next_state(state); |
70dec807 | 457 | if (state->tree) { |
d1310b2e | 458 | rb_erase(&state->rb_node, &tree->state); |
70dec807 | 459 | state->tree = NULL; |
d1310b2e CM |
460 | free_extent_state(state); |
461 | } else { | |
462 | WARN_ON(1); | |
463 | } | |
464 | } else { | |
465 | merge_state(tree, state); | |
cdc6a395 | 466 | next = next_state(state); |
d1310b2e | 467 | } |
cdc6a395 | 468 | return next; |
d1310b2e CM |
469 | } |
470 | ||
8233767a XG |
471 | static struct extent_state * |
472 | alloc_extent_state_atomic(struct extent_state *prealloc) | |
473 | { | |
474 | if (!prealloc) | |
475 | prealloc = alloc_extent_state(GFP_ATOMIC); | |
476 | ||
477 | return prealloc; | |
478 | } | |
479 | ||
48a3b636 | 480 | static void extent_io_tree_panic(struct extent_io_tree *tree, int err) |
c2d904e0 JM |
481 | { |
482 | btrfs_panic(tree_fs_info(tree), err, "Locking error: " | |
483 | "Extent tree was modified by another " | |
484 | "thread while locked."); | |
485 | } | |
486 | ||
d1310b2e CM |
487 | /* |
488 | * clear some bits on a range in the tree. This may require splitting | |
489 | * or inserting elements in the tree, so the gfp mask is used to | |
490 | * indicate which allocations or sleeping are allowed. | |
491 | * | |
492 | * pass 'wake' == 1 to kick any sleepers, and 'delete' == 1 to remove | |
493 | * the given range from the tree regardless of state (ie for truncate). | |
494 | * | |
495 | * the range [start, end] is inclusive. | |
496 | * | |
6763af84 | 497 | * This takes the tree lock, and returns 0 on success and < 0 on error. |
d1310b2e CM |
498 | */ |
499 | int clear_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, | |
41074888 | 500 | unsigned long bits, int wake, int delete, |
2c64c53d CM |
501 | struct extent_state **cached_state, |
502 | gfp_t mask) | |
d1310b2e CM |
503 | { |
504 | struct extent_state *state; | |
2c64c53d | 505 | struct extent_state *cached; |
d1310b2e CM |
506 | struct extent_state *prealloc = NULL; |
507 | struct rb_node *node; | |
5c939df5 | 508 | u64 last_end; |
d1310b2e | 509 | int err; |
2ac55d41 | 510 | int clear = 0; |
d1310b2e | 511 | |
0ca1f7ce YZ |
512 | if (delete) |
513 | bits |= ~EXTENT_CTLBITS; | |
514 | bits |= EXTENT_FIRST_DELALLOC; | |
515 | ||
2ac55d41 JB |
516 | if (bits & (EXTENT_IOBITS | EXTENT_BOUNDARY)) |
517 | clear = 1; | |
d1310b2e CM |
518 | again: |
519 | if (!prealloc && (mask & __GFP_WAIT)) { | |
520 | prealloc = alloc_extent_state(mask); | |
521 | if (!prealloc) | |
522 | return -ENOMEM; | |
523 | } | |
524 | ||
cad321ad | 525 | spin_lock(&tree->lock); |
2c64c53d CM |
526 | if (cached_state) { |
527 | cached = *cached_state; | |
2ac55d41 JB |
528 | |
529 | if (clear) { | |
530 | *cached_state = NULL; | |
531 | cached_state = NULL; | |
532 | } | |
533 | ||
df98b6e2 JB |
534 | if (cached && cached->tree && cached->start <= start && |
535 | cached->end > start) { | |
2ac55d41 JB |
536 | if (clear) |
537 | atomic_dec(&cached->refs); | |
2c64c53d | 538 | state = cached; |
42daec29 | 539 | goto hit_next; |
2c64c53d | 540 | } |
2ac55d41 JB |
541 | if (clear) |
542 | free_extent_state(cached); | |
2c64c53d | 543 | } |
d1310b2e CM |
544 | /* |
545 | * this search will find the extents that end after | |
546 | * our range starts | |
547 | */ | |
80ea96b1 | 548 | node = tree_search(tree, start); |
d1310b2e CM |
549 | if (!node) |
550 | goto out; | |
551 | state = rb_entry(node, struct extent_state, rb_node); | |
2c64c53d | 552 | hit_next: |
d1310b2e CM |
553 | if (state->start > end) |
554 | goto out; | |
555 | WARN_ON(state->end < start); | |
5c939df5 | 556 | last_end = state->end; |
d1310b2e | 557 | |
0449314a | 558 | /* the state doesn't have the wanted bits, go ahead */ |
cdc6a395 LZ |
559 | if (!(state->state & bits)) { |
560 | state = next_state(state); | |
0449314a | 561 | goto next; |
cdc6a395 | 562 | } |
0449314a | 563 | |
d1310b2e CM |
564 | /* |
565 | * | ---- desired range ---- | | |
566 | * | state | or | |
567 | * | ------------- state -------------- | | |
568 | * | |
569 | * We need to split the extent we found, and may flip | |
570 | * bits on second half. | |
571 | * | |
572 | * If the extent we found extends past our range, we | |
573 | * just split and search again. It'll get split again | |
574 | * the next time though. | |
575 | * | |
576 | * If the extent we found is inside our range, we clear | |
577 | * the desired bit on it. | |
578 | */ | |
579 | ||
580 | if (state->start < start) { | |
8233767a XG |
581 | prealloc = alloc_extent_state_atomic(prealloc); |
582 | BUG_ON(!prealloc); | |
d1310b2e | 583 | err = split_state(tree, state, prealloc, start); |
c2d904e0 JM |
584 | if (err) |
585 | extent_io_tree_panic(tree, err); | |
586 | ||
d1310b2e CM |
587 | prealloc = NULL; |
588 | if (err) | |
589 | goto out; | |
590 | if (state->end <= end) { | |
d1ac6e41 LB |
591 | state = clear_state_bit(tree, state, &bits, wake); |
592 | goto next; | |
d1310b2e CM |
593 | } |
594 | goto search_again; | |
595 | } | |
596 | /* | |
597 | * | ---- desired range ---- | | |
598 | * | state | | |
599 | * We need to split the extent, and clear the bit | |
600 | * on the first half | |
601 | */ | |
602 | if (state->start <= end && state->end > end) { | |
8233767a XG |
603 | prealloc = alloc_extent_state_atomic(prealloc); |
604 | BUG_ON(!prealloc); | |
d1310b2e | 605 | err = split_state(tree, state, prealloc, end + 1); |
c2d904e0 JM |
606 | if (err) |
607 | extent_io_tree_panic(tree, err); | |
608 | ||
d1310b2e CM |
609 | if (wake) |
610 | wake_up(&state->wq); | |
42daec29 | 611 | |
6763af84 | 612 | clear_state_bit(tree, prealloc, &bits, wake); |
9ed74f2d | 613 | |
d1310b2e CM |
614 | prealloc = NULL; |
615 | goto out; | |
616 | } | |
42daec29 | 617 | |
cdc6a395 | 618 | state = clear_state_bit(tree, state, &bits, wake); |
0449314a | 619 | next: |
5c939df5 YZ |
620 | if (last_end == (u64)-1) |
621 | goto out; | |
622 | start = last_end + 1; | |
cdc6a395 | 623 | if (start <= end && state && !need_resched()) |
692e5759 | 624 | goto hit_next; |
d1310b2e CM |
625 | goto search_again; |
626 | ||
627 | out: | |
cad321ad | 628 | spin_unlock(&tree->lock); |
d1310b2e CM |
629 | if (prealloc) |
630 | free_extent_state(prealloc); | |
631 | ||
6763af84 | 632 | return 0; |
d1310b2e CM |
633 | |
634 | search_again: | |
635 | if (start > end) | |
636 | goto out; | |
cad321ad | 637 | spin_unlock(&tree->lock); |
d1310b2e CM |
638 | if (mask & __GFP_WAIT) |
639 | cond_resched(); | |
640 | goto again; | |
641 | } | |
d1310b2e | 642 | |
143bede5 JM |
643 | static void wait_on_state(struct extent_io_tree *tree, |
644 | struct extent_state *state) | |
641f5219 CH |
645 | __releases(tree->lock) |
646 | __acquires(tree->lock) | |
d1310b2e CM |
647 | { |
648 | DEFINE_WAIT(wait); | |
649 | prepare_to_wait(&state->wq, &wait, TASK_UNINTERRUPTIBLE); | |
cad321ad | 650 | spin_unlock(&tree->lock); |
d1310b2e | 651 | schedule(); |
cad321ad | 652 | spin_lock(&tree->lock); |
d1310b2e | 653 | finish_wait(&state->wq, &wait); |
d1310b2e CM |
654 | } |
655 | ||
656 | /* | |
657 | * waits for one or more bits to clear on a range in the state tree. | |
658 | * The range [start, end] is inclusive. | |
659 | * The tree lock is taken by this function | |
660 | */ | |
41074888 DS |
661 | static void wait_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, |
662 | unsigned long bits) | |
d1310b2e CM |
663 | { |
664 | struct extent_state *state; | |
665 | struct rb_node *node; | |
666 | ||
cad321ad | 667 | spin_lock(&tree->lock); |
d1310b2e CM |
668 | again: |
669 | while (1) { | |
670 | /* | |
671 | * this search will find all the extents that end after | |
672 | * our range starts | |
673 | */ | |
80ea96b1 | 674 | node = tree_search(tree, start); |
d1310b2e CM |
675 | if (!node) |
676 | break; | |
677 | ||
678 | state = rb_entry(node, struct extent_state, rb_node); | |
679 | ||
680 | if (state->start > end) | |
681 | goto out; | |
682 | ||
683 | if (state->state & bits) { | |
684 | start = state->start; | |
685 | atomic_inc(&state->refs); | |
686 | wait_on_state(tree, state); | |
687 | free_extent_state(state); | |
688 | goto again; | |
689 | } | |
690 | start = state->end + 1; | |
691 | ||
692 | if (start > end) | |
693 | break; | |
694 | ||
ded91f08 | 695 | cond_resched_lock(&tree->lock); |
d1310b2e CM |
696 | } |
697 | out: | |
cad321ad | 698 | spin_unlock(&tree->lock); |
d1310b2e | 699 | } |
d1310b2e | 700 | |
1bf85046 | 701 | static void set_state_bits(struct extent_io_tree *tree, |
d1310b2e | 702 | struct extent_state *state, |
41074888 | 703 | unsigned long *bits) |
d1310b2e | 704 | { |
41074888 | 705 | unsigned long bits_to_set = *bits & ~EXTENT_CTLBITS; |
9ed74f2d | 706 | |
1bf85046 | 707 | set_state_cb(tree, state, bits); |
0ca1f7ce | 708 | if ((bits_to_set & EXTENT_DIRTY) && !(state->state & EXTENT_DIRTY)) { |
d1310b2e CM |
709 | u64 range = state->end - state->start + 1; |
710 | tree->dirty_bytes += range; | |
711 | } | |
0ca1f7ce | 712 | state->state |= bits_to_set; |
d1310b2e CM |
713 | } |
714 | ||
2c64c53d CM |
715 | static void cache_state(struct extent_state *state, |
716 | struct extent_state **cached_ptr) | |
717 | { | |
718 | if (cached_ptr && !(*cached_ptr)) { | |
719 | if (state->state & (EXTENT_IOBITS | EXTENT_BOUNDARY)) { | |
720 | *cached_ptr = state; | |
721 | atomic_inc(&state->refs); | |
722 | } | |
723 | } | |
724 | } | |
725 | ||
507903b8 AJ |
726 | static void uncache_state(struct extent_state **cached_ptr) |
727 | { | |
728 | if (cached_ptr && (*cached_ptr)) { | |
729 | struct extent_state *state = *cached_ptr; | |
109b36a2 CM |
730 | *cached_ptr = NULL; |
731 | free_extent_state(state); | |
507903b8 AJ |
732 | } |
733 | } | |
734 | ||
d1310b2e | 735 | /* |
1edbb734 CM |
736 | * set some bits on a range in the tree. This may require allocations or |
737 | * sleeping, so the gfp mask is used to indicate what is allowed. | |
d1310b2e | 738 | * |
1edbb734 CM |
739 | * If any of the exclusive bits are set, this will fail with -EEXIST if some |
740 | * part of the range already has the desired bits set. The start of the | |
741 | * existing range is returned in failed_start in this case. | |
d1310b2e | 742 | * |
1edbb734 | 743 | * [start, end] is inclusive This takes the tree lock. |
d1310b2e | 744 | */ |
1edbb734 | 745 | |
3fbe5c02 JM |
746 | static int __must_check |
747 | __set_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, | |
41074888 DS |
748 | unsigned long bits, unsigned long exclusive_bits, |
749 | u64 *failed_start, struct extent_state **cached_state, | |
750 | gfp_t mask) | |
d1310b2e CM |
751 | { |
752 | struct extent_state *state; | |
753 | struct extent_state *prealloc = NULL; | |
754 | struct rb_node *node; | |
d1310b2e | 755 | int err = 0; |
d1310b2e CM |
756 | u64 last_start; |
757 | u64 last_end; | |
42daec29 | 758 | |
0ca1f7ce | 759 | bits |= EXTENT_FIRST_DELALLOC; |
d1310b2e CM |
760 | again: |
761 | if (!prealloc && (mask & __GFP_WAIT)) { | |
762 | prealloc = alloc_extent_state(mask); | |
8233767a | 763 | BUG_ON(!prealloc); |
d1310b2e CM |
764 | } |
765 | ||
cad321ad | 766 | spin_lock(&tree->lock); |
9655d298 CM |
767 | if (cached_state && *cached_state) { |
768 | state = *cached_state; | |
df98b6e2 JB |
769 | if (state->start <= start && state->end > start && |
770 | state->tree) { | |
9655d298 CM |
771 | node = &state->rb_node; |
772 | goto hit_next; | |
773 | } | |
774 | } | |
d1310b2e CM |
775 | /* |
776 | * this search will find all the extents that end after | |
777 | * our range starts. | |
778 | */ | |
80ea96b1 | 779 | node = tree_search(tree, start); |
d1310b2e | 780 | if (!node) { |
8233767a XG |
781 | prealloc = alloc_extent_state_atomic(prealloc); |
782 | BUG_ON(!prealloc); | |
0ca1f7ce | 783 | err = insert_state(tree, prealloc, start, end, &bits); |
c2d904e0 JM |
784 | if (err) |
785 | extent_io_tree_panic(tree, err); | |
786 | ||
d1310b2e | 787 | prealloc = NULL; |
d1310b2e CM |
788 | goto out; |
789 | } | |
d1310b2e | 790 | state = rb_entry(node, struct extent_state, rb_node); |
40431d6c | 791 | hit_next: |
d1310b2e CM |
792 | last_start = state->start; |
793 | last_end = state->end; | |
794 | ||
795 | /* | |
796 | * | ---- desired range ---- | | |
797 | * | state | | |
798 | * | |
799 | * Just lock what we found and keep going | |
800 | */ | |
801 | if (state->start == start && state->end <= end) { | |
1edbb734 | 802 | if (state->state & exclusive_bits) { |
d1310b2e CM |
803 | *failed_start = state->start; |
804 | err = -EEXIST; | |
805 | goto out; | |
806 | } | |
42daec29 | 807 | |
1bf85046 | 808 | set_state_bits(tree, state, &bits); |
2c64c53d | 809 | cache_state(state, cached_state); |
d1310b2e | 810 | merge_state(tree, state); |
5c939df5 YZ |
811 | if (last_end == (u64)-1) |
812 | goto out; | |
813 | start = last_end + 1; | |
d1ac6e41 LB |
814 | state = next_state(state); |
815 | if (start < end && state && state->start == start && | |
816 | !need_resched()) | |
817 | goto hit_next; | |
d1310b2e CM |
818 | goto search_again; |
819 | } | |
820 | ||
821 | /* | |
822 | * | ---- desired range ---- | | |
823 | * | state | | |
824 | * or | |
825 | * | ------------- state -------------- | | |
826 | * | |
827 | * We need to split the extent we found, and may flip bits on | |
828 | * second half. | |
829 | * | |
830 | * If the extent we found extends past our | |
831 | * range, we just split and search again. It'll get split | |
832 | * again the next time though. | |
833 | * | |
834 | * If the extent we found is inside our range, we set the | |
835 | * desired bit on it. | |
836 | */ | |
837 | if (state->start < start) { | |
1edbb734 | 838 | if (state->state & exclusive_bits) { |
d1310b2e CM |
839 | *failed_start = start; |
840 | err = -EEXIST; | |
841 | goto out; | |
842 | } | |
8233767a XG |
843 | |
844 | prealloc = alloc_extent_state_atomic(prealloc); | |
845 | BUG_ON(!prealloc); | |
d1310b2e | 846 | err = split_state(tree, state, prealloc, start); |
c2d904e0 JM |
847 | if (err) |
848 | extent_io_tree_panic(tree, err); | |
849 | ||
d1310b2e CM |
850 | prealloc = NULL; |
851 | if (err) | |
852 | goto out; | |
853 | if (state->end <= end) { | |
1bf85046 | 854 | set_state_bits(tree, state, &bits); |
2c64c53d | 855 | cache_state(state, cached_state); |
d1310b2e | 856 | merge_state(tree, state); |
5c939df5 YZ |
857 | if (last_end == (u64)-1) |
858 | goto out; | |
859 | start = last_end + 1; | |
d1ac6e41 LB |
860 | state = next_state(state); |
861 | if (start < end && state && state->start == start && | |
862 | !need_resched()) | |
863 | goto hit_next; | |
d1310b2e CM |
864 | } |
865 | goto search_again; | |
866 | } | |
867 | /* | |
868 | * | ---- desired range ---- | | |
869 | * | state | or | state | | |
870 | * | |
871 | * There's a hole, we need to insert something in it and | |
872 | * ignore the extent we found. | |
873 | */ | |
874 | if (state->start > start) { | |
875 | u64 this_end; | |
876 | if (end < last_start) | |
877 | this_end = end; | |
878 | else | |
d397712b | 879 | this_end = last_start - 1; |
8233767a XG |
880 | |
881 | prealloc = alloc_extent_state_atomic(prealloc); | |
882 | BUG_ON(!prealloc); | |
c7f895a2 XG |
883 | |
884 | /* | |
885 | * Avoid to free 'prealloc' if it can be merged with | |
886 | * the later extent. | |
887 | */ | |
d1310b2e | 888 | err = insert_state(tree, prealloc, start, this_end, |
0ca1f7ce | 889 | &bits); |
c2d904e0 JM |
890 | if (err) |
891 | extent_io_tree_panic(tree, err); | |
892 | ||
9ed74f2d JB |
893 | cache_state(prealloc, cached_state); |
894 | prealloc = NULL; | |
d1310b2e CM |
895 | start = this_end + 1; |
896 | goto search_again; | |
897 | } | |
898 | /* | |
899 | * | ---- desired range ---- | | |
900 | * | state | | |
901 | * We need to split the extent, and set the bit | |
902 | * on the first half | |
903 | */ | |
904 | if (state->start <= end && state->end > end) { | |
1edbb734 | 905 | if (state->state & exclusive_bits) { |
d1310b2e CM |
906 | *failed_start = start; |
907 | err = -EEXIST; | |
908 | goto out; | |
909 | } | |
8233767a XG |
910 | |
911 | prealloc = alloc_extent_state_atomic(prealloc); | |
912 | BUG_ON(!prealloc); | |
d1310b2e | 913 | err = split_state(tree, state, prealloc, end + 1); |
c2d904e0 JM |
914 | if (err) |
915 | extent_io_tree_panic(tree, err); | |
d1310b2e | 916 | |
1bf85046 | 917 | set_state_bits(tree, prealloc, &bits); |
2c64c53d | 918 | cache_state(prealloc, cached_state); |
d1310b2e CM |
919 | merge_state(tree, prealloc); |
920 | prealloc = NULL; | |
921 | goto out; | |
922 | } | |
923 | ||
924 | goto search_again; | |
925 | ||
926 | out: | |
cad321ad | 927 | spin_unlock(&tree->lock); |
d1310b2e CM |
928 | if (prealloc) |
929 | free_extent_state(prealloc); | |
930 | ||
931 | return err; | |
932 | ||
933 | search_again: | |
934 | if (start > end) | |
935 | goto out; | |
cad321ad | 936 | spin_unlock(&tree->lock); |
d1310b2e CM |
937 | if (mask & __GFP_WAIT) |
938 | cond_resched(); | |
939 | goto again; | |
940 | } | |
d1310b2e | 941 | |
41074888 DS |
942 | int set_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, |
943 | unsigned long bits, u64 * failed_start, | |
944 | struct extent_state **cached_state, gfp_t mask) | |
3fbe5c02 JM |
945 | { |
946 | return __set_extent_bit(tree, start, end, bits, 0, failed_start, | |
947 | cached_state, mask); | |
948 | } | |
949 | ||
950 | ||
462d6fac | 951 | /** |
10983f2e LB |
952 | * convert_extent_bit - convert all bits in a given range from one bit to |
953 | * another | |
462d6fac JB |
954 | * @tree: the io tree to search |
955 | * @start: the start offset in bytes | |
956 | * @end: the end offset in bytes (inclusive) | |
957 | * @bits: the bits to set in this range | |
958 | * @clear_bits: the bits to clear in this range | |
e6138876 | 959 | * @cached_state: state that we're going to cache |
462d6fac JB |
960 | * @mask: the allocation mask |
961 | * | |
962 | * This will go through and set bits for the given range. If any states exist | |
963 | * already in this range they are set with the given bit and cleared of the | |
964 | * clear_bits. This is only meant to be used by things that are mergeable, ie | |
965 | * converting from say DELALLOC to DIRTY. This is not meant to be used with | |
966 | * boundary bits like LOCK. | |
967 | */ | |
968 | int convert_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, | |
41074888 | 969 | unsigned long bits, unsigned long clear_bits, |
e6138876 | 970 | struct extent_state **cached_state, gfp_t mask) |
462d6fac JB |
971 | { |
972 | struct extent_state *state; | |
973 | struct extent_state *prealloc = NULL; | |
974 | struct rb_node *node; | |
975 | int err = 0; | |
976 | u64 last_start; | |
977 | u64 last_end; | |
978 | ||
979 | again: | |
980 | if (!prealloc && (mask & __GFP_WAIT)) { | |
981 | prealloc = alloc_extent_state(mask); | |
982 | if (!prealloc) | |
983 | return -ENOMEM; | |
984 | } | |
985 | ||
986 | spin_lock(&tree->lock); | |
e6138876 JB |
987 | if (cached_state && *cached_state) { |
988 | state = *cached_state; | |
989 | if (state->start <= start && state->end > start && | |
990 | state->tree) { | |
991 | node = &state->rb_node; | |
992 | goto hit_next; | |
993 | } | |
994 | } | |
995 | ||
462d6fac JB |
996 | /* |
997 | * this search will find all the extents that end after | |
998 | * our range starts. | |
999 | */ | |
1000 | node = tree_search(tree, start); | |
1001 | if (!node) { | |
1002 | prealloc = alloc_extent_state_atomic(prealloc); | |
1cf4ffdb LB |
1003 | if (!prealloc) { |
1004 | err = -ENOMEM; | |
1005 | goto out; | |
1006 | } | |
462d6fac JB |
1007 | err = insert_state(tree, prealloc, start, end, &bits); |
1008 | prealloc = NULL; | |
c2d904e0 JM |
1009 | if (err) |
1010 | extent_io_tree_panic(tree, err); | |
462d6fac JB |
1011 | goto out; |
1012 | } | |
1013 | state = rb_entry(node, struct extent_state, rb_node); | |
1014 | hit_next: | |
1015 | last_start = state->start; | |
1016 | last_end = state->end; | |
1017 | ||
1018 | /* | |
1019 | * | ---- desired range ---- | | |
1020 | * | state | | |
1021 | * | |
1022 | * Just lock what we found and keep going | |
1023 | */ | |
1024 | if (state->start == start && state->end <= end) { | |
462d6fac | 1025 | set_state_bits(tree, state, &bits); |
e6138876 | 1026 | cache_state(state, cached_state); |
d1ac6e41 | 1027 | state = clear_state_bit(tree, state, &clear_bits, 0); |
462d6fac JB |
1028 | if (last_end == (u64)-1) |
1029 | goto out; | |
462d6fac | 1030 | start = last_end + 1; |
d1ac6e41 LB |
1031 | if (start < end && state && state->start == start && |
1032 | !need_resched()) | |
1033 | goto hit_next; | |
462d6fac JB |
1034 | goto search_again; |
1035 | } | |
1036 | ||
1037 | /* | |
1038 | * | ---- desired range ---- | | |
1039 | * | state | | |
1040 | * or | |
1041 | * | ------------- state -------------- | | |
1042 | * | |
1043 | * We need to split the extent we found, and may flip bits on | |
1044 | * second half. | |
1045 | * | |
1046 | * If the extent we found extends past our | |
1047 | * range, we just split and search again. It'll get split | |
1048 | * again the next time though. | |
1049 | * | |
1050 | * If the extent we found is inside our range, we set the | |
1051 | * desired bit on it. | |
1052 | */ | |
1053 | if (state->start < start) { | |
1054 | prealloc = alloc_extent_state_atomic(prealloc); | |
1cf4ffdb LB |
1055 | if (!prealloc) { |
1056 | err = -ENOMEM; | |
1057 | goto out; | |
1058 | } | |
462d6fac | 1059 | err = split_state(tree, state, prealloc, start); |
c2d904e0 JM |
1060 | if (err) |
1061 | extent_io_tree_panic(tree, err); | |
462d6fac JB |
1062 | prealloc = NULL; |
1063 | if (err) | |
1064 | goto out; | |
1065 | if (state->end <= end) { | |
1066 | set_state_bits(tree, state, &bits); | |
e6138876 | 1067 | cache_state(state, cached_state); |
d1ac6e41 | 1068 | state = clear_state_bit(tree, state, &clear_bits, 0); |
462d6fac JB |
1069 | if (last_end == (u64)-1) |
1070 | goto out; | |
1071 | start = last_end + 1; | |
d1ac6e41 LB |
1072 | if (start < end && state && state->start == start && |
1073 | !need_resched()) | |
1074 | goto hit_next; | |
462d6fac JB |
1075 | } |
1076 | goto search_again; | |
1077 | } | |
1078 | /* | |
1079 | * | ---- desired range ---- | | |
1080 | * | state | or | state | | |
1081 | * | |
1082 | * There's a hole, we need to insert something in it and | |
1083 | * ignore the extent we found. | |
1084 | */ | |
1085 | if (state->start > start) { | |
1086 | u64 this_end; | |
1087 | if (end < last_start) | |
1088 | this_end = end; | |
1089 | else | |
1090 | this_end = last_start - 1; | |
1091 | ||
1092 | prealloc = alloc_extent_state_atomic(prealloc); | |
1cf4ffdb LB |
1093 | if (!prealloc) { |
1094 | err = -ENOMEM; | |
1095 | goto out; | |
1096 | } | |
462d6fac JB |
1097 | |
1098 | /* | |
1099 | * Avoid to free 'prealloc' if it can be merged with | |
1100 | * the later extent. | |
1101 | */ | |
1102 | err = insert_state(tree, prealloc, start, this_end, | |
1103 | &bits); | |
c2d904e0 JM |
1104 | if (err) |
1105 | extent_io_tree_panic(tree, err); | |
e6138876 | 1106 | cache_state(prealloc, cached_state); |
462d6fac JB |
1107 | prealloc = NULL; |
1108 | start = this_end + 1; | |
1109 | goto search_again; | |
1110 | } | |
1111 | /* | |
1112 | * | ---- desired range ---- | | |
1113 | * | state | | |
1114 | * We need to split the extent, and set the bit | |
1115 | * on the first half | |
1116 | */ | |
1117 | if (state->start <= end && state->end > end) { | |
1118 | prealloc = alloc_extent_state_atomic(prealloc); | |
1cf4ffdb LB |
1119 | if (!prealloc) { |
1120 | err = -ENOMEM; | |
1121 | goto out; | |
1122 | } | |
462d6fac JB |
1123 | |
1124 | err = split_state(tree, state, prealloc, end + 1); | |
c2d904e0 JM |
1125 | if (err) |
1126 | extent_io_tree_panic(tree, err); | |
462d6fac JB |
1127 | |
1128 | set_state_bits(tree, prealloc, &bits); | |
e6138876 | 1129 | cache_state(prealloc, cached_state); |
462d6fac | 1130 | clear_state_bit(tree, prealloc, &clear_bits, 0); |
462d6fac JB |
1131 | prealloc = NULL; |
1132 | goto out; | |
1133 | } | |
1134 | ||
1135 | goto search_again; | |
1136 | ||
1137 | out: | |
1138 | spin_unlock(&tree->lock); | |
1139 | if (prealloc) | |
1140 | free_extent_state(prealloc); | |
1141 | ||
1142 | return err; | |
1143 | ||
1144 | search_again: | |
1145 | if (start > end) | |
1146 | goto out; | |
1147 | spin_unlock(&tree->lock); | |
1148 | if (mask & __GFP_WAIT) | |
1149 | cond_resched(); | |
1150 | goto again; | |
1151 | } | |
1152 | ||
d1310b2e CM |
1153 | /* wrappers around set/clear extent bit */ |
1154 | int set_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end, | |
1155 | gfp_t mask) | |
1156 | { | |
3fbe5c02 | 1157 | return set_extent_bit(tree, start, end, EXTENT_DIRTY, NULL, |
2c64c53d | 1158 | NULL, mask); |
d1310b2e | 1159 | } |
d1310b2e CM |
1160 | |
1161 | int set_extent_bits(struct extent_io_tree *tree, u64 start, u64 end, | |
41074888 | 1162 | unsigned long bits, gfp_t mask) |
d1310b2e | 1163 | { |
3fbe5c02 | 1164 | return set_extent_bit(tree, start, end, bits, NULL, |
2c64c53d | 1165 | NULL, mask); |
d1310b2e | 1166 | } |
d1310b2e CM |
1167 | |
1168 | int clear_extent_bits(struct extent_io_tree *tree, u64 start, u64 end, | |
41074888 | 1169 | unsigned long bits, gfp_t mask) |
d1310b2e | 1170 | { |
2c64c53d | 1171 | return clear_extent_bit(tree, start, end, bits, 0, 0, NULL, mask); |
d1310b2e | 1172 | } |
d1310b2e CM |
1173 | |
1174 | int set_extent_delalloc(struct extent_io_tree *tree, u64 start, u64 end, | |
2ac55d41 | 1175 | struct extent_state **cached_state, gfp_t mask) |
d1310b2e CM |
1176 | { |
1177 | return set_extent_bit(tree, start, end, | |
fee187d9 | 1178 | EXTENT_DELALLOC | EXTENT_UPTODATE, |
3fbe5c02 | 1179 | NULL, cached_state, mask); |
d1310b2e | 1180 | } |
d1310b2e | 1181 | |
9e8a4a8b LB |
1182 | int set_extent_defrag(struct extent_io_tree *tree, u64 start, u64 end, |
1183 | struct extent_state **cached_state, gfp_t mask) | |
1184 | { | |
1185 | return set_extent_bit(tree, start, end, | |
1186 | EXTENT_DELALLOC | EXTENT_UPTODATE | EXTENT_DEFRAG, | |
1187 | NULL, cached_state, mask); | |
1188 | } | |
1189 | ||
d1310b2e CM |
1190 | int clear_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end, |
1191 | gfp_t mask) | |
1192 | { | |
1193 | return clear_extent_bit(tree, start, end, | |
32c00aff | 1194 | EXTENT_DIRTY | EXTENT_DELALLOC | |
0ca1f7ce | 1195 | EXTENT_DO_ACCOUNTING, 0, 0, NULL, mask); |
d1310b2e | 1196 | } |
d1310b2e CM |
1197 | |
1198 | int set_extent_new(struct extent_io_tree *tree, u64 start, u64 end, | |
1199 | gfp_t mask) | |
1200 | { | |
3fbe5c02 | 1201 | return set_extent_bit(tree, start, end, EXTENT_NEW, NULL, |
2c64c53d | 1202 | NULL, mask); |
d1310b2e | 1203 | } |
d1310b2e | 1204 | |
d1310b2e | 1205 | int set_extent_uptodate(struct extent_io_tree *tree, u64 start, u64 end, |
507903b8 | 1206 | struct extent_state **cached_state, gfp_t mask) |
d1310b2e | 1207 | { |
6b67a320 | 1208 | return set_extent_bit(tree, start, end, EXTENT_UPTODATE, NULL, |
3fbe5c02 | 1209 | cached_state, mask); |
d1310b2e | 1210 | } |
d1310b2e | 1211 | |
5fd02043 JB |
1212 | int clear_extent_uptodate(struct extent_io_tree *tree, u64 start, u64 end, |
1213 | struct extent_state **cached_state, gfp_t mask) | |
d1310b2e | 1214 | { |
2c64c53d | 1215 | return clear_extent_bit(tree, start, end, EXTENT_UPTODATE, 0, 0, |
2ac55d41 | 1216 | cached_state, mask); |
d1310b2e | 1217 | } |
d1310b2e | 1218 | |
d352ac68 CM |
1219 | /* |
1220 | * either insert or lock state struct between start and end use mask to tell | |
1221 | * us if waiting is desired. | |
1222 | */ | |
1edbb734 | 1223 | int lock_extent_bits(struct extent_io_tree *tree, u64 start, u64 end, |
41074888 | 1224 | unsigned long bits, struct extent_state **cached_state) |
d1310b2e CM |
1225 | { |
1226 | int err; | |
1227 | u64 failed_start; | |
1228 | while (1) { | |
3fbe5c02 JM |
1229 | err = __set_extent_bit(tree, start, end, EXTENT_LOCKED | bits, |
1230 | EXTENT_LOCKED, &failed_start, | |
1231 | cached_state, GFP_NOFS); | |
d0082371 | 1232 | if (err == -EEXIST) { |
d1310b2e CM |
1233 | wait_extent_bit(tree, failed_start, end, EXTENT_LOCKED); |
1234 | start = failed_start; | |
d0082371 | 1235 | } else |
d1310b2e | 1236 | break; |
d1310b2e CM |
1237 | WARN_ON(start > end); |
1238 | } | |
1239 | return err; | |
1240 | } | |
d1310b2e | 1241 | |
d0082371 | 1242 | int lock_extent(struct extent_io_tree *tree, u64 start, u64 end) |
1edbb734 | 1243 | { |
d0082371 | 1244 | return lock_extent_bits(tree, start, end, 0, NULL); |
1edbb734 CM |
1245 | } |
1246 | ||
d0082371 | 1247 | int try_lock_extent(struct extent_io_tree *tree, u64 start, u64 end) |
25179201 JB |
1248 | { |
1249 | int err; | |
1250 | u64 failed_start; | |
1251 | ||
3fbe5c02 JM |
1252 | err = __set_extent_bit(tree, start, end, EXTENT_LOCKED, EXTENT_LOCKED, |
1253 | &failed_start, NULL, GFP_NOFS); | |
6643558d YZ |
1254 | if (err == -EEXIST) { |
1255 | if (failed_start > start) | |
1256 | clear_extent_bit(tree, start, failed_start - 1, | |
d0082371 | 1257 | EXTENT_LOCKED, 1, 0, NULL, GFP_NOFS); |
25179201 | 1258 | return 0; |
6643558d | 1259 | } |
25179201 JB |
1260 | return 1; |
1261 | } | |
25179201 | 1262 | |
2c64c53d CM |
1263 | int unlock_extent_cached(struct extent_io_tree *tree, u64 start, u64 end, |
1264 | struct extent_state **cached, gfp_t mask) | |
1265 | { | |
1266 | return clear_extent_bit(tree, start, end, EXTENT_LOCKED, 1, 0, cached, | |
1267 | mask); | |
1268 | } | |
1269 | ||
d0082371 | 1270 | int unlock_extent(struct extent_io_tree *tree, u64 start, u64 end) |
d1310b2e | 1271 | { |
2c64c53d | 1272 | return clear_extent_bit(tree, start, end, EXTENT_LOCKED, 1, 0, NULL, |
d0082371 | 1273 | GFP_NOFS); |
d1310b2e | 1274 | } |
d1310b2e | 1275 | |
4adaa611 CM |
1276 | int extent_range_clear_dirty_for_io(struct inode *inode, u64 start, u64 end) |
1277 | { | |
1278 | unsigned long index = start >> PAGE_CACHE_SHIFT; | |
1279 | unsigned long end_index = end >> PAGE_CACHE_SHIFT; | |
1280 | struct page *page; | |
1281 | ||
1282 | while (index <= end_index) { | |
1283 | page = find_get_page(inode->i_mapping, index); | |
1284 | BUG_ON(!page); /* Pages should be in the extent_io_tree */ | |
1285 | clear_page_dirty_for_io(page); | |
1286 | page_cache_release(page); | |
1287 | index++; | |
1288 | } | |
1289 | return 0; | |
1290 | } | |
1291 | ||
1292 | int extent_range_redirty_for_io(struct inode *inode, u64 start, u64 end) | |
1293 | { | |
1294 | unsigned long index = start >> PAGE_CACHE_SHIFT; | |
1295 | unsigned long end_index = end >> PAGE_CACHE_SHIFT; | |
1296 | struct page *page; | |
1297 | ||
1298 | while (index <= end_index) { | |
1299 | page = find_get_page(inode->i_mapping, index); | |
1300 | BUG_ON(!page); /* Pages should be in the extent_io_tree */ | |
1301 | account_page_redirty(page); | |
1302 | __set_page_dirty_nobuffers(page); | |
1303 | page_cache_release(page); | |
1304 | index++; | |
1305 | } | |
1306 | return 0; | |
1307 | } | |
1308 | ||
d1310b2e CM |
1309 | /* |
1310 | * helper function to set both pages and extents in the tree writeback | |
1311 | */ | |
b2950863 | 1312 | static int set_range_writeback(struct extent_io_tree *tree, u64 start, u64 end) |
d1310b2e CM |
1313 | { |
1314 | unsigned long index = start >> PAGE_CACHE_SHIFT; | |
1315 | unsigned long end_index = end >> PAGE_CACHE_SHIFT; | |
1316 | struct page *page; | |
1317 | ||
1318 | while (index <= end_index) { | |
1319 | page = find_get_page(tree->mapping, index); | |
79787eaa | 1320 | BUG_ON(!page); /* Pages should be in the extent_io_tree */ |
d1310b2e CM |
1321 | set_page_writeback(page); |
1322 | page_cache_release(page); | |
1323 | index++; | |
1324 | } | |
d1310b2e CM |
1325 | return 0; |
1326 | } | |
d1310b2e | 1327 | |
d352ac68 CM |
1328 | /* find the first state struct with 'bits' set after 'start', and |
1329 | * return it. tree->lock must be held. NULL will returned if | |
1330 | * nothing was found after 'start' | |
1331 | */ | |
48a3b636 ES |
1332 | static struct extent_state * |
1333 | find_first_extent_bit_state(struct extent_io_tree *tree, | |
41074888 | 1334 | u64 start, unsigned long bits) |
d7fc640e CM |
1335 | { |
1336 | struct rb_node *node; | |
1337 | struct extent_state *state; | |
1338 | ||
1339 | /* | |
1340 | * this search will find all the extents that end after | |
1341 | * our range starts. | |
1342 | */ | |
1343 | node = tree_search(tree, start); | |
d397712b | 1344 | if (!node) |
d7fc640e | 1345 | goto out; |
d7fc640e | 1346 | |
d397712b | 1347 | while (1) { |
d7fc640e | 1348 | state = rb_entry(node, struct extent_state, rb_node); |
d397712b | 1349 | if (state->end >= start && (state->state & bits)) |
d7fc640e | 1350 | return state; |
d397712b | 1351 | |
d7fc640e CM |
1352 | node = rb_next(node); |
1353 | if (!node) | |
1354 | break; | |
1355 | } | |
1356 | out: | |
1357 | return NULL; | |
1358 | } | |
d7fc640e | 1359 | |
69261c4b XG |
1360 | /* |
1361 | * find the first offset in the io tree with 'bits' set. zero is | |
1362 | * returned if we find something, and *start_ret and *end_ret are | |
1363 | * set to reflect the state struct that was found. | |
1364 | * | |
477d7eaf | 1365 | * If nothing was found, 1 is returned. If found something, return 0. |
69261c4b XG |
1366 | */ |
1367 | int find_first_extent_bit(struct extent_io_tree *tree, u64 start, | |
41074888 | 1368 | u64 *start_ret, u64 *end_ret, unsigned long bits, |
e6138876 | 1369 | struct extent_state **cached_state) |
69261c4b XG |
1370 | { |
1371 | struct extent_state *state; | |
e6138876 | 1372 | struct rb_node *n; |
69261c4b XG |
1373 | int ret = 1; |
1374 | ||
1375 | spin_lock(&tree->lock); | |
e6138876 JB |
1376 | if (cached_state && *cached_state) { |
1377 | state = *cached_state; | |
1378 | if (state->end == start - 1 && state->tree) { | |
1379 | n = rb_next(&state->rb_node); | |
1380 | while (n) { | |
1381 | state = rb_entry(n, struct extent_state, | |
1382 | rb_node); | |
1383 | if (state->state & bits) | |
1384 | goto got_it; | |
1385 | n = rb_next(n); | |
1386 | } | |
1387 | free_extent_state(*cached_state); | |
1388 | *cached_state = NULL; | |
1389 | goto out; | |
1390 | } | |
1391 | free_extent_state(*cached_state); | |
1392 | *cached_state = NULL; | |
1393 | } | |
1394 | ||
69261c4b | 1395 | state = find_first_extent_bit_state(tree, start, bits); |
e6138876 | 1396 | got_it: |
69261c4b | 1397 | if (state) { |
e6138876 | 1398 | cache_state(state, cached_state); |
69261c4b XG |
1399 | *start_ret = state->start; |
1400 | *end_ret = state->end; | |
1401 | ret = 0; | |
1402 | } | |
e6138876 | 1403 | out: |
69261c4b XG |
1404 | spin_unlock(&tree->lock); |
1405 | return ret; | |
1406 | } | |
1407 | ||
d352ac68 CM |
1408 | /* |
1409 | * find a contiguous range of bytes in the file marked as delalloc, not | |
1410 | * more than 'max_bytes'. start and end are used to return the range, | |
1411 | * | |
1412 | * 1 is returned if we find something, 0 if nothing was in the tree | |
1413 | */ | |
c8b97818 | 1414 | static noinline u64 find_delalloc_range(struct extent_io_tree *tree, |
c2a128d2 JB |
1415 | u64 *start, u64 *end, u64 max_bytes, |
1416 | struct extent_state **cached_state) | |
d1310b2e CM |
1417 | { |
1418 | struct rb_node *node; | |
1419 | struct extent_state *state; | |
1420 | u64 cur_start = *start; | |
1421 | u64 found = 0; | |
1422 | u64 total_bytes = 0; | |
1423 | ||
cad321ad | 1424 | spin_lock(&tree->lock); |
c8b97818 | 1425 | |
d1310b2e CM |
1426 | /* |
1427 | * this search will find all the extents that end after | |
1428 | * our range starts. | |
1429 | */ | |
80ea96b1 | 1430 | node = tree_search(tree, cur_start); |
2b114d1d | 1431 | if (!node) { |
3b951516 CM |
1432 | if (!found) |
1433 | *end = (u64)-1; | |
d1310b2e CM |
1434 | goto out; |
1435 | } | |
1436 | ||
d397712b | 1437 | while (1) { |
d1310b2e | 1438 | state = rb_entry(node, struct extent_state, rb_node); |
5b21f2ed ZY |
1439 | if (found && (state->start != cur_start || |
1440 | (state->state & EXTENT_BOUNDARY))) { | |
d1310b2e CM |
1441 | goto out; |
1442 | } | |
1443 | if (!(state->state & EXTENT_DELALLOC)) { | |
1444 | if (!found) | |
1445 | *end = state->end; | |
1446 | goto out; | |
1447 | } | |
c2a128d2 | 1448 | if (!found) { |
d1310b2e | 1449 | *start = state->start; |
c2a128d2 JB |
1450 | *cached_state = state; |
1451 | atomic_inc(&state->refs); | |
1452 | } | |
d1310b2e CM |
1453 | found++; |
1454 | *end = state->end; | |
1455 | cur_start = state->end + 1; | |
1456 | node = rb_next(node); | |
1457 | if (!node) | |
1458 | break; | |
1459 | total_bytes += state->end - state->start + 1; | |
1460 | if (total_bytes >= max_bytes) | |
1461 | break; | |
1462 | } | |
1463 | out: | |
cad321ad | 1464 | spin_unlock(&tree->lock); |
d1310b2e CM |
1465 | return found; |
1466 | } | |
1467 | ||
143bede5 JM |
1468 | static noinline void __unlock_for_delalloc(struct inode *inode, |
1469 | struct page *locked_page, | |
1470 | u64 start, u64 end) | |
c8b97818 CM |
1471 | { |
1472 | int ret; | |
1473 | struct page *pages[16]; | |
1474 | unsigned long index = start >> PAGE_CACHE_SHIFT; | |
1475 | unsigned long end_index = end >> PAGE_CACHE_SHIFT; | |
1476 | unsigned long nr_pages = end_index - index + 1; | |
1477 | int i; | |
1478 | ||
1479 | if (index == locked_page->index && end_index == index) | |
143bede5 | 1480 | return; |
c8b97818 | 1481 | |
d397712b | 1482 | while (nr_pages > 0) { |
c8b97818 | 1483 | ret = find_get_pages_contig(inode->i_mapping, index, |
5b050f04 CM |
1484 | min_t(unsigned long, nr_pages, |
1485 | ARRAY_SIZE(pages)), pages); | |
c8b97818 CM |
1486 | for (i = 0; i < ret; i++) { |
1487 | if (pages[i] != locked_page) | |
1488 | unlock_page(pages[i]); | |
1489 | page_cache_release(pages[i]); | |
1490 | } | |
1491 | nr_pages -= ret; | |
1492 | index += ret; | |
1493 | cond_resched(); | |
1494 | } | |
c8b97818 CM |
1495 | } |
1496 | ||
1497 | static noinline int lock_delalloc_pages(struct inode *inode, | |
1498 | struct page *locked_page, | |
1499 | u64 delalloc_start, | |
1500 | u64 delalloc_end) | |
1501 | { | |
1502 | unsigned long index = delalloc_start >> PAGE_CACHE_SHIFT; | |
1503 | unsigned long start_index = index; | |
1504 | unsigned long end_index = delalloc_end >> PAGE_CACHE_SHIFT; | |
1505 | unsigned long pages_locked = 0; | |
1506 | struct page *pages[16]; | |
1507 | unsigned long nrpages; | |
1508 | int ret; | |
1509 | int i; | |
1510 | ||
1511 | /* the caller is responsible for locking the start index */ | |
1512 | if (index == locked_page->index && index == end_index) | |
1513 | return 0; | |
1514 | ||
1515 | /* skip the page at the start index */ | |
1516 | nrpages = end_index - index + 1; | |
d397712b | 1517 | while (nrpages > 0) { |
c8b97818 | 1518 | ret = find_get_pages_contig(inode->i_mapping, index, |
5b050f04 CM |
1519 | min_t(unsigned long, |
1520 | nrpages, ARRAY_SIZE(pages)), pages); | |
c8b97818 CM |
1521 | if (ret == 0) { |
1522 | ret = -EAGAIN; | |
1523 | goto done; | |
1524 | } | |
1525 | /* now we have an array of pages, lock them all */ | |
1526 | for (i = 0; i < ret; i++) { | |
1527 | /* | |
1528 | * the caller is taking responsibility for | |
1529 | * locked_page | |
1530 | */ | |
771ed689 | 1531 | if (pages[i] != locked_page) { |
c8b97818 | 1532 | lock_page(pages[i]); |
f2b1c41c CM |
1533 | if (!PageDirty(pages[i]) || |
1534 | pages[i]->mapping != inode->i_mapping) { | |
771ed689 CM |
1535 | ret = -EAGAIN; |
1536 | unlock_page(pages[i]); | |
1537 | page_cache_release(pages[i]); | |
1538 | goto done; | |
1539 | } | |
1540 | } | |
c8b97818 | 1541 | page_cache_release(pages[i]); |
771ed689 | 1542 | pages_locked++; |
c8b97818 | 1543 | } |
c8b97818 CM |
1544 | nrpages -= ret; |
1545 | index += ret; | |
1546 | cond_resched(); | |
1547 | } | |
1548 | ret = 0; | |
1549 | done: | |
1550 | if (ret && pages_locked) { | |
1551 | __unlock_for_delalloc(inode, locked_page, | |
1552 | delalloc_start, | |
1553 | ((u64)(start_index + pages_locked - 1)) << | |
1554 | PAGE_CACHE_SHIFT); | |
1555 | } | |
1556 | return ret; | |
1557 | } | |
1558 | ||
1559 | /* | |
1560 | * find a contiguous range of bytes in the file marked as delalloc, not | |
1561 | * more than 'max_bytes'. start and end are used to return the range, | |
1562 | * | |
1563 | * 1 is returned if we find something, 0 if nothing was in the tree | |
1564 | */ | |
1565 | static noinline u64 find_lock_delalloc_range(struct inode *inode, | |
1566 | struct extent_io_tree *tree, | |
1567 | struct page *locked_page, | |
1568 | u64 *start, u64 *end, | |
1569 | u64 max_bytes) | |
1570 | { | |
1571 | u64 delalloc_start; | |
1572 | u64 delalloc_end; | |
1573 | u64 found; | |
9655d298 | 1574 | struct extent_state *cached_state = NULL; |
c8b97818 CM |
1575 | int ret; |
1576 | int loops = 0; | |
1577 | ||
1578 | again: | |
1579 | /* step one, find a bunch of delalloc bytes starting at start */ | |
1580 | delalloc_start = *start; | |
1581 | delalloc_end = 0; | |
1582 | found = find_delalloc_range(tree, &delalloc_start, &delalloc_end, | |
c2a128d2 | 1583 | max_bytes, &cached_state); |
70b99e69 | 1584 | if (!found || delalloc_end <= *start) { |
c8b97818 CM |
1585 | *start = delalloc_start; |
1586 | *end = delalloc_end; | |
c2a128d2 | 1587 | free_extent_state(cached_state); |
c8b97818 CM |
1588 | return found; |
1589 | } | |
1590 | ||
70b99e69 CM |
1591 | /* |
1592 | * start comes from the offset of locked_page. We have to lock | |
1593 | * pages in order, so we can't process delalloc bytes before | |
1594 | * locked_page | |
1595 | */ | |
d397712b | 1596 | if (delalloc_start < *start) |
70b99e69 | 1597 | delalloc_start = *start; |
70b99e69 | 1598 | |
c8b97818 CM |
1599 | /* |
1600 | * make sure to limit the number of pages we try to lock down | |
1601 | * if we're looping. | |
1602 | */ | |
d397712b | 1603 | if (delalloc_end + 1 - delalloc_start > max_bytes && loops) |
771ed689 | 1604 | delalloc_end = delalloc_start + PAGE_CACHE_SIZE - 1; |
d397712b | 1605 | |
c8b97818 CM |
1606 | /* step two, lock all the pages after the page that has start */ |
1607 | ret = lock_delalloc_pages(inode, locked_page, | |
1608 | delalloc_start, delalloc_end); | |
1609 | if (ret == -EAGAIN) { | |
1610 | /* some of the pages are gone, lets avoid looping by | |
1611 | * shortening the size of the delalloc range we're searching | |
1612 | */ | |
9655d298 | 1613 | free_extent_state(cached_state); |
c8b97818 CM |
1614 | if (!loops) { |
1615 | unsigned long offset = (*start) & (PAGE_CACHE_SIZE - 1); | |
1616 | max_bytes = PAGE_CACHE_SIZE - offset; | |
1617 | loops = 1; | |
1618 | goto again; | |
1619 | } else { | |
1620 | found = 0; | |
1621 | goto out_failed; | |
1622 | } | |
1623 | } | |
79787eaa | 1624 | BUG_ON(ret); /* Only valid values are 0 and -EAGAIN */ |
c8b97818 CM |
1625 | |
1626 | /* step three, lock the state bits for the whole range */ | |
d0082371 | 1627 | lock_extent_bits(tree, delalloc_start, delalloc_end, 0, &cached_state); |
c8b97818 CM |
1628 | |
1629 | /* then test to make sure it is all still delalloc */ | |
1630 | ret = test_range_bit(tree, delalloc_start, delalloc_end, | |
9655d298 | 1631 | EXTENT_DELALLOC, 1, cached_state); |
c8b97818 | 1632 | if (!ret) { |
9655d298 CM |
1633 | unlock_extent_cached(tree, delalloc_start, delalloc_end, |
1634 | &cached_state, GFP_NOFS); | |
c8b97818 CM |
1635 | __unlock_for_delalloc(inode, locked_page, |
1636 | delalloc_start, delalloc_end); | |
1637 | cond_resched(); | |
1638 | goto again; | |
1639 | } | |
9655d298 | 1640 | free_extent_state(cached_state); |
c8b97818 CM |
1641 | *start = delalloc_start; |
1642 | *end = delalloc_end; | |
1643 | out_failed: | |
1644 | return found; | |
1645 | } | |
1646 | ||
1647 | int extent_clear_unlock_delalloc(struct inode *inode, | |
1648 | struct extent_io_tree *tree, | |
1649 | u64 start, u64 end, struct page *locked_page, | |
a791e35e | 1650 | unsigned long op) |
c8b97818 CM |
1651 | { |
1652 | int ret; | |
1653 | struct page *pages[16]; | |
1654 | unsigned long index = start >> PAGE_CACHE_SHIFT; | |
1655 | unsigned long end_index = end >> PAGE_CACHE_SHIFT; | |
1656 | unsigned long nr_pages = end_index - index + 1; | |
1657 | int i; | |
41074888 | 1658 | unsigned long clear_bits = 0; |
c8b97818 | 1659 | |
a791e35e | 1660 | if (op & EXTENT_CLEAR_UNLOCK) |
771ed689 | 1661 | clear_bits |= EXTENT_LOCKED; |
a791e35e | 1662 | if (op & EXTENT_CLEAR_DIRTY) |
c8b97818 CM |
1663 | clear_bits |= EXTENT_DIRTY; |
1664 | ||
a791e35e | 1665 | if (op & EXTENT_CLEAR_DELALLOC) |
771ed689 CM |
1666 | clear_bits |= EXTENT_DELALLOC; |
1667 | ||
2c64c53d | 1668 | clear_extent_bit(tree, start, end, clear_bits, 1, 0, NULL, GFP_NOFS); |
32c00aff JB |
1669 | if (!(op & (EXTENT_CLEAR_UNLOCK_PAGE | EXTENT_CLEAR_DIRTY | |
1670 | EXTENT_SET_WRITEBACK | EXTENT_END_WRITEBACK | | |
1671 | EXTENT_SET_PRIVATE2))) | |
771ed689 | 1672 | return 0; |
c8b97818 | 1673 | |
d397712b | 1674 | while (nr_pages > 0) { |
c8b97818 | 1675 | ret = find_get_pages_contig(inode->i_mapping, index, |
5b050f04 CM |
1676 | min_t(unsigned long, |
1677 | nr_pages, ARRAY_SIZE(pages)), pages); | |
c8b97818 | 1678 | for (i = 0; i < ret; i++) { |
8b62b72b | 1679 | |
a791e35e | 1680 | if (op & EXTENT_SET_PRIVATE2) |
8b62b72b CM |
1681 | SetPagePrivate2(pages[i]); |
1682 | ||
c8b97818 CM |
1683 | if (pages[i] == locked_page) { |
1684 | page_cache_release(pages[i]); | |
1685 | continue; | |
1686 | } | |
a791e35e | 1687 | if (op & EXTENT_CLEAR_DIRTY) |
c8b97818 | 1688 | clear_page_dirty_for_io(pages[i]); |
a791e35e | 1689 | if (op & EXTENT_SET_WRITEBACK) |
c8b97818 | 1690 | set_page_writeback(pages[i]); |
a791e35e | 1691 | if (op & EXTENT_END_WRITEBACK) |
c8b97818 | 1692 | end_page_writeback(pages[i]); |
a791e35e | 1693 | if (op & EXTENT_CLEAR_UNLOCK_PAGE) |
771ed689 | 1694 | unlock_page(pages[i]); |
c8b97818 CM |
1695 | page_cache_release(pages[i]); |
1696 | } | |
1697 | nr_pages -= ret; | |
1698 | index += ret; | |
1699 | cond_resched(); | |
1700 | } | |
1701 | return 0; | |
1702 | } | |
c8b97818 | 1703 | |
d352ac68 CM |
1704 | /* |
1705 | * count the number of bytes in the tree that have a given bit(s) | |
1706 | * set. This can be fairly slow, except for EXTENT_DIRTY which is | |
1707 | * cached. The total number found is returned. | |
1708 | */ | |
d1310b2e CM |
1709 | u64 count_range_bits(struct extent_io_tree *tree, |
1710 | u64 *start, u64 search_end, u64 max_bytes, | |
ec29ed5b | 1711 | unsigned long bits, int contig) |
d1310b2e CM |
1712 | { |
1713 | struct rb_node *node; | |
1714 | struct extent_state *state; | |
1715 | u64 cur_start = *start; | |
1716 | u64 total_bytes = 0; | |
ec29ed5b | 1717 | u64 last = 0; |
d1310b2e CM |
1718 | int found = 0; |
1719 | ||
1720 | if (search_end <= cur_start) { | |
d1310b2e CM |
1721 | WARN_ON(1); |
1722 | return 0; | |
1723 | } | |
1724 | ||
cad321ad | 1725 | spin_lock(&tree->lock); |
d1310b2e CM |
1726 | if (cur_start == 0 && bits == EXTENT_DIRTY) { |
1727 | total_bytes = tree->dirty_bytes; | |
1728 | goto out; | |
1729 | } | |
1730 | /* | |
1731 | * this search will find all the extents that end after | |
1732 | * our range starts. | |
1733 | */ | |
80ea96b1 | 1734 | node = tree_search(tree, cur_start); |
d397712b | 1735 | if (!node) |
d1310b2e | 1736 | goto out; |
d1310b2e | 1737 | |
d397712b | 1738 | while (1) { |
d1310b2e CM |
1739 | state = rb_entry(node, struct extent_state, rb_node); |
1740 | if (state->start > search_end) | |
1741 | break; | |
ec29ed5b CM |
1742 | if (contig && found && state->start > last + 1) |
1743 | break; | |
1744 | if (state->end >= cur_start && (state->state & bits) == bits) { | |
d1310b2e CM |
1745 | total_bytes += min(search_end, state->end) + 1 - |
1746 | max(cur_start, state->start); | |
1747 | if (total_bytes >= max_bytes) | |
1748 | break; | |
1749 | if (!found) { | |
af60bed2 | 1750 | *start = max(cur_start, state->start); |
d1310b2e CM |
1751 | found = 1; |
1752 | } | |
ec29ed5b CM |
1753 | last = state->end; |
1754 | } else if (contig && found) { | |
1755 | break; | |
d1310b2e CM |
1756 | } |
1757 | node = rb_next(node); | |
1758 | if (!node) | |
1759 | break; | |
1760 | } | |
1761 | out: | |
cad321ad | 1762 | spin_unlock(&tree->lock); |
d1310b2e CM |
1763 | return total_bytes; |
1764 | } | |
b2950863 | 1765 | |
d352ac68 CM |
1766 | /* |
1767 | * set the private field for a given byte offset in the tree. If there isn't | |
1768 | * an extent_state there already, this does nothing. | |
1769 | */ | |
d1310b2e CM |
1770 | int set_state_private(struct extent_io_tree *tree, u64 start, u64 private) |
1771 | { | |
1772 | struct rb_node *node; | |
1773 | struct extent_state *state; | |
1774 | int ret = 0; | |
1775 | ||
cad321ad | 1776 | spin_lock(&tree->lock); |
d1310b2e CM |
1777 | /* |
1778 | * this search will find all the extents that end after | |
1779 | * our range starts. | |
1780 | */ | |
80ea96b1 | 1781 | node = tree_search(tree, start); |
2b114d1d | 1782 | if (!node) { |
d1310b2e CM |
1783 | ret = -ENOENT; |
1784 | goto out; | |
1785 | } | |
1786 | state = rb_entry(node, struct extent_state, rb_node); | |
1787 | if (state->start != start) { | |
1788 | ret = -ENOENT; | |
1789 | goto out; | |
1790 | } | |
1791 | state->private = private; | |
1792 | out: | |
cad321ad | 1793 | spin_unlock(&tree->lock); |
d1310b2e CM |
1794 | return ret; |
1795 | } | |
1796 | ||
e4100d98 MX |
1797 | void extent_cache_csums_dio(struct extent_io_tree *tree, u64 start, u32 csums[], |
1798 | int count) | |
1799 | { | |
1800 | struct rb_node *node; | |
1801 | struct extent_state *state; | |
1802 | ||
1803 | spin_lock(&tree->lock); | |
1804 | /* | |
1805 | * this search will find all the extents that end after | |
1806 | * our range starts. | |
1807 | */ | |
1808 | node = tree_search(tree, start); | |
1809 | BUG_ON(!node); | |
1810 | ||
1811 | state = rb_entry(node, struct extent_state, rb_node); | |
1812 | BUG_ON(state->start != start); | |
1813 | ||
1814 | while (count) { | |
1815 | state->private = *csums++; | |
1816 | count--; | |
1817 | state = next_state(state); | |
1818 | } | |
1819 | spin_unlock(&tree->lock); | |
1820 | } | |
1821 | ||
1822 | static inline u64 __btrfs_get_bio_offset(struct bio *bio, int bio_index) | |
1823 | { | |
1824 | struct bio_vec *bvec = bio->bi_io_vec + bio_index; | |
1825 | ||
1826 | return page_offset(bvec->bv_page) + bvec->bv_offset; | |
1827 | } | |
1828 | ||
1829 | void extent_cache_csums(struct extent_io_tree *tree, struct bio *bio, int bio_index, | |
1830 | u32 csums[], int count) | |
1831 | { | |
1832 | struct rb_node *node; | |
1833 | struct extent_state *state = NULL; | |
1834 | u64 start; | |
1835 | ||
1836 | spin_lock(&tree->lock); | |
1837 | do { | |
1838 | start = __btrfs_get_bio_offset(bio, bio_index); | |
1839 | if (state == NULL || state->start != start) { | |
1840 | node = tree_search(tree, start); | |
1841 | BUG_ON(!node); | |
1842 | ||
1843 | state = rb_entry(node, struct extent_state, rb_node); | |
1844 | BUG_ON(state->start != start); | |
1845 | } | |
1846 | state->private = *csums++; | |
1847 | count--; | |
1848 | bio_index++; | |
1849 | ||
1850 | state = next_state(state); | |
1851 | } while (count); | |
1852 | spin_unlock(&tree->lock); | |
1853 | } | |
1854 | ||
d1310b2e CM |
1855 | int get_state_private(struct extent_io_tree *tree, u64 start, u64 *private) |
1856 | { | |
1857 | struct rb_node *node; | |
1858 | struct extent_state *state; | |
1859 | int ret = 0; | |
1860 | ||
cad321ad | 1861 | spin_lock(&tree->lock); |
d1310b2e CM |
1862 | /* |
1863 | * this search will find all the extents that end after | |
1864 | * our range starts. | |
1865 | */ | |
80ea96b1 | 1866 | node = tree_search(tree, start); |
2b114d1d | 1867 | if (!node) { |
d1310b2e CM |
1868 | ret = -ENOENT; |
1869 | goto out; | |
1870 | } | |
1871 | state = rb_entry(node, struct extent_state, rb_node); | |
1872 | if (state->start != start) { | |
1873 | ret = -ENOENT; | |
1874 | goto out; | |
1875 | } | |
1876 | *private = state->private; | |
1877 | out: | |
cad321ad | 1878 | spin_unlock(&tree->lock); |
d1310b2e CM |
1879 | return ret; |
1880 | } | |
1881 | ||
1882 | /* | |
1883 | * searches a range in the state tree for a given mask. | |
70dec807 | 1884 | * If 'filled' == 1, this returns 1 only if every extent in the tree |
d1310b2e CM |
1885 | * has the bits set. Otherwise, 1 is returned if any bit in the |
1886 | * range is found set. | |
1887 | */ | |
1888 | int test_range_bit(struct extent_io_tree *tree, u64 start, u64 end, | |
41074888 | 1889 | unsigned long bits, int filled, struct extent_state *cached) |
d1310b2e CM |
1890 | { |
1891 | struct extent_state *state = NULL; | |
1892 | struct rb_node *node; | |
1893 | int bitset = 0; | |
d1310b2e | 1894 | |
cad321ad | 1895 | spin_lock(&tree->lock); |
df98b6e2 JB |
1896 | if (cached && cached->tree && cached->start <= start && |
1897 | cached->end > start) | |
9655d298 CM |
1898 | node = &cached->rb_node; |
1899 | else | |
1900 | node = tree_search(tree, start); | |
d1310b2e CM |
1901 | while (node && start <= end) { |
1902 | state = rb_entry(node, struct extent_state, rb_node); | |
1903 | ||
1904 | if (filled && state->start > start) { | |
1905 | bitset = 0; | |
1906 | break; | |
1907 | } | |
1908 | ||
1909 | if (state->start > end) | |
1910 | break; | |
1911 | ||
1912 | if (state->state & bits) { | |
1913 | bitset = 1; | |
1914 | if (!filled) | |
1915 | break; | |
1916 | } else if (filled) { | |
1917 | bitset = 0; | |
1918 | break; | |
1919 | } | |
46562cec CM |
1920 | |
1921 | if (state->end == (u64)-1) | |
1922 | break; | |
1923 | ||
d1310b2e CM |
1924 | start = state->end + 1; |
1925 | if (start > end) | |
1926 | break; | |
1927 | node = rb_next(node); | |
1928 | if (!node) { | |
1929 | if (filled) | |
1930 | bitset = 0; | |
1931 | break; | |
1932 | } | |
1933 | } | |
cad321ad | 1934 | spin_unlock(&tree->lock); |
d1310b2e CM |
1935 | return bitset; |
1936 | } | |
d1310b2e CM |
1937 | |
1938 | /* | |
1939 | * helper function to set a given page up to date if all the | |
1940 | * extents in the tree for that page are up to date | |
1941 | */ | |
143bede5 | 1942 | static void check_page_uptodate(struct extent_io_tree *tree, struct page *page) |
d1310b2e | 1943 | { |
4eee4fa4 | 1944 | u64 start = page_offset(page); |
d1310b2e | 1945 | u64 end = start + PAGE_CACHE_SIZE - 1; |
9655d298 | 1946 | if (test_range_bit(tree, start, end, EXTENT_UPTODATE, 1, NULL)) |
d1310b2e | 1947 | SetPageUptodate(page); |
d1310b2e CM |
1948 | } |
1949 | ||
1950 | /* | |
1951 | * helper function to unlock a page if all the extents in the tree | |
1952 | * for that page are unlocked | |
1953 | */ | |
143bede5 | 1954 | static void check_page_locked(struct extent_io_tree *tree, struct page *page) |
d1310b2e | 1955 | { |
4eee4fa4 | 1956 | u64 start = page_offset(page); |
d1310b2e | 1957 | u64 end = start + PAGE_CACHE_SIZE - 1; |
9655d298 | 1958 | if (!test_range_bit(tree, start, end, EXTENT_LOCKED, 0, NULL)) |
d1310b2e | 1959 | unlock_page(page); |
d1310b2e CM |
1960 | } |
1961 | ||
1962 | /* | |
1963 | * helper function to end page writeback if all the extents | |
1964 | * in the tree for that page are done with writeback | |
1965 | */ | |
143bede5 JM |
1966 | static void check_page_writeback(struct extent_io_tree *tree, |
1967 | struct page *page) | |
d1310b2e | 1968 | { |
1edbb734 | 1969 | end_page_writeback(page); |
d1310b2e CM |
1970 | } |
1971 | ||
4a54c8c1 JS |
1972 | /* |
1973 | * When IO fails, either with EIO or csum verification fails, we | |
1974 | * try other mirrors that might have a good copy of the data. This | |
1975 | * io_failure_record is used to record state as we go through all the | |
1976 | * mirrors. If another mirror has good data, the page is set up to date | |
1977 | * and things continue. If a good mirror can't be found, the original | |
1978 | * bio end_io callback is called to indicate things have failed. | |
1979 | */ | |
1980 | struct io_failure_record { | |
1981 | struct page *page; | |
1982 | u64 start; | |
1983 | u64 len; | |
1984 | u64 logical; | |
1985 | unsigned long bio_flags; | |
1986 | int this_mirror; | |
1987 | int failed_mirror; | |
1988 | int in_validation; | |
1989 | }; | |
1990 | ||
1991 | static int free_io_failure(struct inode *inode, struct io_failure_record *rec, | |
1992 | int did_repair) | |
1993 | { | |
1994 | int ret; | |
1995 | int err = 0; | |
1996 | struct extent_io_tree *failure_tree = &BTRFS_I(inode)->io_failure_tree; | |
1997 | ||
1998 | set_state_private(failure_tree, rec->start, 0); | |
1999 | ret = clear_extent_bits(failure_tree, rec->start, | |
2000 | rec->start + rec->len - 1, | |
2001 | EXTENT_LOCKED | EXTENT_DIRTY, GFP_NOFS); | |
2002 | if (ret) | |
2003 | err = ret; | |
2004 | ||
53b381b3 DW |
2005 | ret = clear_extent_bits(&BTRFS_I(inode)->io_tree, rec->start, |
2006 | rec->start + rec->len - 1, | |
2007 | EXTENT_DAMAGED, GFP_NOFS); | |
2008 | if (ret && !err) | |
2009 | err = ret; | |
4a54c8c1 JS |
2010 | |
2011 | kfree(rec); | |
2012 | return err; | |
2013 | } | |
2014 | ||
2015 | static void repair_io_failure_callback(struct bio *bio, int err) | |
2016 | { | |
2017 | complete(bio->bi_private); | |
2018 | } | |
2019 | ||
2020 | /* | |
2021 | * this bypasses the standard btrfs submit functions deliberately, as | |
2022 | * the standard behavior is to write all copies in a raid setup. here we only | |
2023 | * want to write the one bad copy. so we do the mapping for ourselves and issue | |
2024 | * submit_bio directly. | |
3ec706c8 | 2025 | * to avoid any synchronization issues, wait for the data after writing, which |
4a54c8c1 JS |
2026 | * actually prevents the read that triggered the error from finishing. |
2027 | * currently, there can be no more than two copies of every data bit. thus, | |
2028 | * exactly one rewrite is required. | |
2029 | */ | |
3ec706c8 | 2030 | int repair_io_failure(struct btrfs_fs_info *fs_info, u64 start, |
4a54c8c1 JS |
2031 | u64 length, u64 logical, struct page *page, |
2032 | int mirror_num) | |
2033 | { | |
2034 | struct bio *bio; | |
2035 | struct btrfs_device *dev; | |
2036 | DECLARE_COMPLETION_ONSTACK(compl); | |
2037 | u64 map_length = 0; | |
2038 | u64 sector; | |
2039 | struct btrfs_bio *bbio = NULL; | |
53b381b3 | 2040 | struct btrfs_mapping_tree *map_tree = &fs_info->mapping_tree; |
4a54c8c1 JS |
2041 | int ret; |
2042 | ||
2043 | BUG_ON(!mirror_num); | |
2044 | ||
53b381b3 DW |
2045 | /* we can't repair anything in raid56 yet */ |
2046 | if (btrfs_is_parity_mirror(map_tree, logical, length, mirror_num)) | |
2047 | return 0; | |
2048 | ||
4a54c8c1 JS |
2049 | bio = bio_alloc(GFP_NOFS, 1); |
2050 | if (!bio) | |
2051 | return -EIO; | |
2052 | bio->bi_private = &compl; | |
2053 | bio->bi_end_io = repair_io_failure_callback; | |
2054 | bio->bi_size = 0; | |
2055 | map_length = length; | |
2056 | ||
3ec706c8 | 2057 | ret = btrfs_map_block(fs_info, WRITE, logical, |
4a54c8c1 JS |
2058 | &map_length, &bbio, mirror_num); |
2059 | if (ret) { | |
2060 | bio_put(bio); | |
2061 | return -EIO; | |
2062 | } | |
2063 | BUG_ON(mirror_num != bbio->mirror_num); | |
2064 | sector = bbio->stripes[mirror_num-1].physical >> 9; | |
2065 | bio->bi_sector = sector; | |
2066 | dev = bbio->stripes[mirror_num-1].dev; | |
2067 | kfree(bbio); | |
2068 | if (!dev || !dev->bdev || !dev->writeable) { | |
2069 | bio_put(bio); | |
2070 | return -EIO; | |
2071 | } | |
2072 | bio->bi_bdev = dev->bdev; | |
4eee4fa4 | 2073 | bio_add_page(bio, page, length, start - page_offset(page)); |
21adbd5c | 2074 | btrfsic_submit_bio(WRITE_SYNC, bio); |
4a54c8c1 JS |
2075 | wait_for_completion(&compl); |
2076 | ||
2077 | if (!test_bit(BIO_UPTODATE, &bio->bi_flags)) { | |
2078 | /* try to remap that extent elsewhere? */ | |
2079 | bio_put(bio); | |
442a4f63 | 2080 | btrfs_dev_stat_inc_and_print(dev, BTRFS_DEV_STAT_WRITE_ERRS); |
4a54c8c1 JS |
2081 | return -EIO; |
2082 | } | |
2083 | ||
d5b025d5 | 2084 | printk_ratelimited_in_rcu(KERN_INFO "btrfs read error corrected: ino %lu off %llu " |
606686ee JB |
2085 | "(dev %s sector %llu)\n", page->mapping->host->i_ino, |
2086 | start, rcu_str_deref(dev->name), sector); | |
4a54c8c1 JS |
2087 | |
2088 | bio_put(bio); | |
2089 | return 0; | |
2090 | } | |
2091 | ||
ea466794 JB |
2092 | int repair_eb_io_failure(struct btrfs_root *root, struct extent_buffer *eb, |
2093 | int mirror_num) | |
2094 | { | |
ea466794 JB |
2095 | u64 start = eb->start; |
2096 | unsigned long i, num_pages = num_extent_pages(eb->start, eb->len); | |
d95603b2 | 2097 | int ret = 0; |
ea466794 JB |
2098 | |
2099 | for (i = 0; i < num_pages; i++) { | |
2100 | struct page *p = extent_buffer_page(eb, i); | |
3ec706c8 | 2101 | ret = repair_io_failure(root->fs_info, start, PAGE_CACHE_SIZE, |
ea466794 JB |
2102 | start, p, mirror_num); |
2103 | if (ret) | |
2104 | break; | |
2105 | start += PAGE_CACHE_SIZE; | |
2106 | } | |
2107 | ||
2108 | return ret; | |
2109 | } | |
2110 | ||
4a54c8c1 JS |
2111 | /* |
2112 | * each time an IO finishes, we do a fast check in the IO failure tree | |
2113 | * to see if we need to process or clean up an io_failure_record | |
2114 | */ | |
2115 | static int clean_io_failure(u64 start, struct page *page) | |
2116 | { | |
2117 | u64 private; | |
2118 | u64 private_failure; | |
2119 | struct io_failure_record *failrec; | |
3ec706c8 | 2120 | struct btrfs_fs_info *fs_info; |
4a54c8c1 JS |
2121 | struct extent_state *state; |
2122 | int num_copies; | |
2123 | int did_repair = 0; | |
2124 | int ret; | |
2125 | struct inode *inode = page->mapping->host; | |
2126 | ||
2127 | private = 0; | |
2128 | ret = count_range_bits(&BTRFS_I(inode)->io_failure_tree, &private, | |
2129 | (u64)-1, 1, EXTENT_DIRTY, 0); | |
2130 | if (!ret) | |
2131 | return 0; | |
2132 | ||
2133 | ret = get_state_private(&BTRFS_I(inode)->io_failure_tree, start, | |
2134 | &private_failure); | |
2135 | if (ret) | |
2136 | return 0; | |
2137 | ||
2138 | failrec = (struct io_failure_record *)(unsigned long) private_failure; | |
2139 | BUG_ON(!failrec->this_mirror); | |
2140 | ||
2141 | if (failrec->in_validation) { | |
2142 | /* there was no real error, just free the record */ | |
2143 | pr_debug("clean_io_failure: freeing dummy error at %llu\n", | |
2144 | failrec->start); | |
2145 | did_repair = 1; | |
2146 | goto out; | |
2147 | } | |
2148 | ||
2149 | spin_lock(&BTRFS_I(inode)->io_tree.lock); | |
2150 | state = find_first_extent_bit_state(&BTRFS_I(inode)->io_tree, | |
2151 | failrec->start, | |
2152 | EXTENT_LOCKED); | |
2153 | spin_unlock(&BTRFS_I(inode)->io_tree.lock); | |
2154 | ||
2155 | if (state && state->start == failrec->start) { | |
3ec706c8 SB |
2156 | fs_info = BTRFS_I(inode)->root->fs_info; |
2157 | num_copies = btrfs_num_copies(fs_info, failrec->logical, | |
2158 | failrec->len); | |
4a54c8c1 | 2159 | if (num_copies > 1) { |
3ec706c8 | 2160 | ret = repair_io_failure(fs_info, start, failrec->len, |
4a54c8c1 JS |
2161 | failrec->logical, page, |
2162 | failrec->failed_mirror); | |
2163 | did_repair = !ret; | |
2164 | } | |
53b381b3 | 2165 | ret = 0; |
4a54c8c1 JS |
2166 | } |
2167 | ||
2168 | out: | |
2169 | if (!ret) | |
2170 | ret = free_io_failure(inode, failrec, did_repair); | |
2171 | ||
2172 | return ret; | |
2173 | } | |
2174 | ||
2175 | /* | |
2176 | * this is a generic handler for readpage errors (default | |
2177 | * readpage_io_failed_hook). if other copies exist, read those and write back | |
2178 | * good data to the failed position. does not investigate in remapping the | |
2179 | * failed extent elsewhere, hoping the device will be smart enough to do this as | |
2180 | * needed | |
2181 | */ | |
2182 | ||
2183 | static int bio_readpage_error(struct bio *failed_bio, struct page *page, | |
2184 | u64 start, u64 end, int failed_mirror, | |
2185 | struct extent_state *state) | |
2186 | { | |
2187 | struct io_failure_record *failrec = NULL; | |
2188 | u64 private; | |
2189 | struct extent_map *em; | |
2190 | struct inode *inode = page->mapping->host; | |
2191 | struct extent_io_tree *failure_tree = &BTRFS_I(inode)->io_failure_tree; | |
2192 | struct extent_io_tree *tree = &BTRFS_I(inode)->io_tree; | |
2193 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; | |
2194 | struct bio *bio; | |
2195 | int num_copies; | |
2196 | int ret; | |
2197 | int read_mode; | |
2198 | u64 logical; | |
2199 | ||
2200 | BUG_ON(failed_bio->bi_rw & REQ_WRITE); | |
2201 | ||
2202 | ret = get_state_private(failure_tree, start, &private); | |
2203 | if (ret) { | |
2204 | failrec = kzalloc(sizeof(*failrec), GFP_NOFS); | |
2205 | if (!failrec) | |
2206 | return -ENOMEM; | |
2207 | failrec->start = start; | |
2208 | failrec->len = end - start + 1; | |
2209 | failrec->this_mirror = 0; | |
2210 | failrec->bio_flags = 0; | |
2211 | failrec->in_validation = 0; | |
2212 | ||
2213 | read_lock(&em_tree->lock); | |
2214 | em = lookup_extent_mapping(em_tree, start, failrec->len); | |
2215 | if (!em) { | |
2216 | read_unlock(&em_tree->lock); | |
2217 | kfree(failrec); | |
2218 | return -EIO; | |
2219 | } | |
2220 | ||
2221 | if (em->start > start || em->start + em->len < start) { | |
2222 | free_extent_map(em); | |
2223 | em = NULL; | |
2224 | } | |
2225 | read_unlock(&em_tree->lock); | |
2226 | ||
7a2d6a64 | 2227 | if (!em) { |
4a54c8c1 JS |
2228 | kfree(failrec); |
2229 | return -EIO; | |
2230 | } | |
2231 | logical = start - em->start; | |
2232 | logical = em->block_start + logical; | |
2233 | if (test_bit(EXTENT_FLAG_COMPRESSED, &em->flags)) { | |
2234 | logical = em->block_start; | |
2235 | failrec->bio_flags = EXTENT_BIO_COMPRESSED; | |
2236 | extent_set_compress_type(&failrec->bio_flags, | |
2237 | em->compress_type); | |
2238 | } | |
2239 | pr_debug("bio_readpage_error: (new) logical=%llu, start=%llu, " | |
2240 | "len=%llu\n", logical, start, failrec->len); | |
2241 | failrec->logical = logical; | |
2242 | free_extent_map(em); | |
2243 | ||
2244 | /* set the bits in the private failure tree */ | |
2245 | ret = set_extent_bits(failure_tree, start, end, | |
2246 | EXTENT_LOCKED | EXTENT_DIRTY, GFP_NOFS); | |
2247 | if (ret >= 0) | |
2248 | ret = set_state_private(failure_tree, start, | |
2249 | (u64)(unsigned long)failrec); | |
2250 | /* set the bits in the inode's tree */ | |
2251 | if (ret >= 0) | |
2252 | ret = set_extent_bits(tree, start, end, EXTENT_DAMAGED, | |
2253 | GFP_NOFS); | |
2254 | if (ret < 0) { | |
2255 | kfree(failrec); | |
2256 | return ret; | |
2257 | } | |
2258 | } else { | |
2259 | failrec = (struct io_failure_record *)(unsigned long)private; | |
2260 | pr_debug("bio_readpage_error: (found) logical=%llu, " | |
2261 | "start=%llu, len=%llu, validation=%d\n", | |
2262 | failrec->logical, failrec->start, failrec->len, | |
2263 | failrec->in_validation); | |
2264 | /* | |
2265 | * when data can be on disk more than twice, add to failrec here | |
2266 | * (e.g. with a list for failed_mirror) to make | |
2267 | * clean_io_failure() clean all those errors at once. | |
2268 | */ | |
2269 | } | |
5d964051 SB |
2270 | num_copies = btrfs_num_copies(BTRFS_I(inode)->root->fs_info, |
2271 | failrec->logical, failrec->len); | |
4a54c8c1 JS |
2272 | if (num_copies == 1) { |
2273 | /* | |
2274 | * we only have a single copy of the data, so don't bother with | |
2275 | * all the retry and error correction code that follows. no | |
2276 | * matter what the error is, it is very likely to persist. | |
2277 | */ | |
2278 | pr_debug("bio_readpage_error: cannot repair, num_copies == 1. " | |
2279 | "state=%p, num_copies=%d, next_mirror %d, " | |
2280 | "failed_mirror %d\n", state, num_copies, | |
2281 | failrec->this_mirror, failed_mirror); | |
2282 | free_io_failure(inode, failrec, 0); | |
2283 | return -EIO; | |
2284 | } | |
2285 | ||
2286 | if (!state) { | |
2287 | spin_lock(&tree->lock); | |
2288 | state = find_first_extent_bit_state(tree, failrec->start, | |
2289 | EXTENT_LOCKED); | |
2290 | if (state && state->start != failrec->start) | |
2291 | state = NULL; | |
2292 | spin_unlock(&tree->lock); | |
2293 | } | |
2294 | ||
2295 | /* | |
2296 | * there are two premises: | |
2297 | * a) deliver good data to the caller | |
2298 | * b) correct the bad sectors on disk | |
2299 | */ | |
2300 | if (failed_bio->bi_vcnt > 1) { | |
2301 | /* | |
2302 | * to fulfill b), we need to know the exact failing sectors, as | |
2303 | * we don't want to rewrite any more than the failed ones. thus, | |
2304 | * we need separate read requests for the failed bio | |
2305 | * | |
2306 | * if the following BUG_ON triggers, our validation request got | |
2307 | * merged. we need separate requests for our algorithm to work. | |
2308 | */ | |
2309 | BUG_ON(failrec->in_validation); | |
2310 | failrec->in_validation = 1; | |
2311 | failrec->this_mirror = failed_mirror; | |
2312 | read_mode = READ_SYNC | REQ_FAILFAST_DEV; | |
2313 | } else { | |
2314 | /* | |
2315 | * we're ready to fulfill a) and b) alongside. get a good copy | |
2316 | * of the failed sector and if we succeed, we have setup | |
2317 | * everything for repair_io_failure to do the rest for us. | |
2318 | */ | |
2319 | if (failrec->in_validation) { | |
2320 | BUG_ON(failrec->this_mirror != failed_mirror); | |
2321 | failrec->in_validation = 0; | |
2322 | failrec->this_mirror = 0; | |
2323 | } | |
2324 | failrec->failed_mirror = failed_mirror; | |
2325 | failrec->this_mirror++; | |
2326 | if (failrec->this_mirror == failed_mirror) | |
2327 | failrec->this_mirror++; | |
2328 | read_mode = READ_SYNC; | |
2329 | } | |
2330 | ||
2331 | if (!state || failrec->this_mirror > num_copies) { | |
2332 | pr_debug("bio_readpage_error: (fail) state=%p, num_copies=%d, " | |
2333 | "next_mirror %d, failed_mirror %d\n", state, | |
2334 | num_copies, failrec->this_mirror, failed_mirror); | |
2335 | free_io_failure(inode, failrec, 0); | |
2336 | return -EIO; | |
2337 | } | |
2338 | ||
2339 | bio = bio_alloc(GFP_NOFS, 1); | |
e627ee7b TI |
2340 | if (!bio) { |
2341 | free_io_failure(inode, failrec, 0); | |
2342 | return -EIO; | |
2343 | } | |
4a54c8c1 JS |
2344 | bio->bi_private = state; |
2345 | bio->bi_end_io = failed_bio->bi_end_io; | |
2346 | bio->bi_sector = failrec->logical >> 9; | |
2347 | bio->bi_bdev = BTRFS_I(inode)->root->fs_info->fs_devices->latest_bdev; | |
2348 | bio->bi_size = 0; | |
2349 | ||
2350 | bio_add_page(bio, page, failrec->len, start - page_offset(page)); | |
2351 | ||
2352 | pr_debug("bio_readpage_error: submitting new read[%#x] to " | |
2353 | "this_mirror=%d, num_copies=%d, in_validation=%d\n", read_mode, | |
2354 | failrec->this_mirror, num_copies, failrec->in_validation); | |
2355 | ||
013bd4c3 TI |
2356 | ret = tree->ops->submit_bio_hook(inode, read_mode, bio, |
2357 | failrec->this_mirror, | |
2358 | failrec->bio_flags, 0); | |
2359 | return ret; | |
4a54c8c1 JS |
2360 | } |
2361 | ||
d1310b2e CM |
2362 | /* lots and lots of room for performance fixes in the end_bio funcs */ |
2363 | ||
87826df0 JM |
2364 | int end_extent_writepage(struct page *page, int err, u64 start, u64 end) |
2365 | { | |
2366 | int uptodate = (err == 0); | |
2367 | struct extent_io_tree *tree; | |
2368 | int ret; | |
2369 | ||
2370 | tree = &BTRFS_I(page->mapping->host)->io_tree; | |
2371 | ||
2372 | if (tree->ops && tree->ops->writepage_end_io_hook) { | |
2373 | ret = tree->ops->writepage_end_io_hook(page, start, | |
2374 | end, NULL, uptodate); | |
2375 | if (ret) | |
2376 | uptodate = 0; | |
2377 | } | |
2378 | ||
87826df0 | 2379 | if (!uptodate) { |
87826df0 JM |
2380 | ClearPageUptodate(page); |
2381 | SetPageError(page); | |
2382 | } | |
2383 | return 0; | |
2384 | } | |
2385 | ||
d1310b2e CM |
2386 | /* |
2387 | * after a writepage IO is done, we need to: | |
2388 | * clear the uptodate bits on error | |
2389 | * clear the writeback bits in the extent tree for this IO | |
2390 | * end_page_writeback if the page has no more pending IO | |
2391 | * | |
2392 | * Scheduling is not allowed, so the extent state tree is expected | |
2393 | * to have one and only one object corresponding to this IO. | |
2394 | */ | |
d1310b2e | 2395 | static void end_bio_extent_writepage(struct bio *bio, int err) |
d1310b2e | 2396 | { |
d1310b2e | 2397 | struct bio_vec *bvec = bio->bi_io_vec + bio->bi_vcnt - 1; |
902b22f3 | 2398 | struct extent_io_tree *tree; |
d1310b2e CM |
2399 | u64 start; |
2400 | u64 end; | |
2401 | int whole_page; | |
2402 | ||
d1310b2e CM |
2403 | do { |
2404 | struct page *page = bvec->bv_page; | |
902b22f3 DW |
2405 | tree = &BTRFS_I(page->mapping->host)->io_tree; |
2406 | ||
4eee4fa4 | 2407 | start = page_offset(page) + bvec->bv_offset; |
d1310b2e CM |
2408 | end = start + bvec->bv_len - 1; |
2409 | ||
2410 | if (bvec->bv_offset == 0 && bvec->bv_len == PAGE_CACHE_SIZE) | |
2411 | whole_page = 1; | |
2412 | else | |
2413 | whole_page = 0; | |
2414 | ||
2415 | if (--bvec >= bio->bi_io_vec) | |
2416 | prefetchw(&bvec->bv_page->flags); | |
1259ab75 | 2417 | |
87826df0 JM |
2418 | if (end_extent_writepage(page, err, start, end)) |
2419 | continue; | |
70dec807 | 2420 | |
d1310b2e CM |
2421 | if (whole_page) |
2422 | end_page_writeback(page); | |
2423 | else | |
2424 | check_page_writeback(tree, page); | |
d1310b2e | 2425 | } while (bvec >= bio->bi_io_vec); |
2b1f55b0 | 2426 | |
d1310b2e | 2427 | bio_put(bio); |
d1310b2e CM |
2428 | } |
2429 | ||
2430 | /* | |
2431 | * after a readpage IO is done, we need to: | |
2432 | * clear the uptodate bits on error | |
2433 | * set the uptodate bits if things worked | |
2434 | * set the page up to date if all extents in the tree are uptodate | |
2435 | * clear the lock bit in the extent tree | |
2436 | * unlock the page if there are no other extents locked for it | |
2437 | * | |
2438 | * Scheduling is not allowed, so the extent state tree is expected | |
2439 | * to have one and only one object corresponding to this IO. | |
2440 | */ | |
d1310b2e | 2441 | static void end_bio_extent_readpage(struct bio *bio, int err) |
d1310b2e CM |
2442 | { |
2443 | int uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags); | |
4125bf76 CM |
2444 | struct bio_vec *bvec_end = bio->bi_io_vec + bio->bi_vcnt - 1; |
2445 | struct bio_vec *bvec = bio->bi_io_vec; | |
902b22f3 | 2446 | struct extent_io_tree *tree; |
d1310b2e CM |
2447 | u64 start; |
2448 | u64 end; | |
2449 | int whole_page; | |
5cf1ab56 | 2450 | int mirror; |
d1310b2e CM |
2451 | int ret; |
2452 | ||
d20f7043 CM |
2453 | if (err) |
2454 | uptodate = 0; | |
2455 | ||
d1310b2e CM |
2456 | do { |
2457 | struct page *page = bvec->bv_page; | |
507903b8 AJ |
2458 | struct extent_state *cached = NULL; |
2459 | struct extent_state *state; | |
2460 | ||
be3940c0 KO |
2461 | pr_debug("end_bio_extent_readpage: bi_sector=%llu, err=%d, " |
2462 | "mirror=%ld\n", (u64)bio->bi_sector, err, | |
4a54c8c1 | 2463 | (long int)bio->bi_bdev); |
902b22f3 DW |
2464 | tree = &BTRFS_I(page->mapping->host)->io_tree; |
2465 | ||
4eee4fa4 | 2466 | start = page_offset(page) + bvec->bv_offset; |
d1310b2e CM |
2467 | end = start + bvec->bv_len - 1; |
2468 | ||
2469 | if (bvec->bv_offset == 0 && bvec->bv_len == PAGE_CACHE_SIZE) | |
2470 | whole_page = 1; | |
2471 | else | |
2472 | whole_page = 0; | |
2473 | ||
4125bf76 | 2474 | if (++bvec <= bvec_end) |
d1310b2e CM |
2475 | prefetchw(&bvec->bv_page->flags); |
2476 | ||
507903b8 | 2477 | spin_lock(&tree->lock); |
0d399205 | 2478 | state = find_first_extent_bit_state(tree, start, EXTENT_LOCKED); |
109b36a2 | 2479 | if (state && state->start == start) { |
507903b8 AJ |
2480 | /* |
2481 | * take a reference on the state, unlock will drop | |
2482 | * the ref | |
2483 | */ | |
2484 | cache_state(state, &cached); | |
2485 | } | |
2486 | spin_unlock(&tree->lock); | |
2487 | ||
5cf1ab56 | 2488 | mirror = (int)(unsigned long)bio->bi_bdev; |
d1310b2e | 2489 | if (uptodate && tree->ops && tree->ops->readpage_end_io_hook) { |
70dec807 | 2490 | ret = tree->ops->readpage_end_io_hook(page, start, end, |
5cf1ab56 | 2491 | state, mirror); |
5ee0844d | 2492 | if (ret) |
d1310b2e | 2493 | uptodate = 0; |
5ee0844d | 2494 | else |
4a54c8c1 | 2495 | clean_io_failure(start, page); |
d1310b2e | 2496 | } |
ea466794 | 2497 | |
ea466794 | 2498 | if (!uptodate && tree->ops && tree->ops->readpage_io_failed_hook) { |
5cf1ab56 | 2499 | ret = tree->ops->readpage_io_failed_hook(page, mirror); |
ea466794 JB |
2500 | if (!ret && !err && |
2501 | test_bit(BIO_UPTODATE, &bio->bi_flags)) | |
2502 | uptodate = 1; | |
2503 | } else if (!uptodate) { | |
f4a8e656 JS |
2504 | /* |
2505 | * The generic bio_readpage_error handles errors the | |
2506 | * following way: If possible, new read requests are | |
2507 | * created and submitted and will end up in | |
2508 | * end_bio_extent_readpage as well (if we're lucky, not | |
2509 | * in the !uptodate case). In that case it returns 0 and | |
2510 | * we just go on with the next page in our bio. If it | |
2511 | * can't handle the error it will return -EIO and we | |
2512 | * remain responsible for that page. | |
2513 | */ | |
5cf1ab56 | 2514 | ret = bio_readpage_error(bio, page, start, end, mirror, NULL); |
7e38326f | 2515 | if (ret == 0) { |
3b951516 CM |
2516 | uptodate = |
2517 | test_bit(BIO_UPTODATE, &bio->bi_flags); | |
d20f7043 CM |
2518 | if (err) |
2519 | uptodate = 0; | |
507903b8 | 2520 | uncache_state(&cached); |
7e38326f CM |
2521 | continue; |
2522 | } | |
2523 | } | |
d1310b2e | 2524 | |
0b32f4bb | 2525 | if (uptodate && tree->track_uptodate) { |
507903b8 | 2526 | set_extent_uptodate(tree, start, end, &cached, |
902b22f3 | 2527 | GFP_ATOMIC); |
771ed689 | 2528 | } |
507903b8 | 2529 | unlock_extent_cached(tree, start, end, &cached, GFP_ATOMIC); |
d1310b2e | 2530 | |
70dec807 CM |
2531 | if (whole_page) { |
2532 | if (uptodate) { | |
2533 | SetPageUptodate(page); | |
2534 | } else { | |
2535 | ClearPageUptodate(page); | |
2536 | SetPageError(page); | |
2537 | } | |
d1310b2e | 2538 | unlock_page(page); |
70dec807 CM |
2539 | } else { |
2540 | if (uptodate) { | |
2541 | check_page_uptodate(tree, page); | |
2542 | } else { | |
2543 | ClearPageUptodate(page); | |
2544 | SetPageError(page); | |
2545 | } | |
d1310b2e | 2546 | check_page_locked(tree, page); |
70dec807 | 2547 | } |
4125bf76 | 2548 | } while (bvec <= bvec_end); |
d1310b2e CM |
2549 | |
2550 | bio_put(bio); | |
d1310b2e CM |
2551 | } |
2552 | ||
88f794ed MX |
2553 | struct bio * |
2554 | btrfs_bio_alloc(struct block_device *bdev, u64 first_sector, int nr_vecs, | |
2555 | gfp_t gfp_flags) | |
d1310b2e CM |
2556 | { |
2557 | struct bio *bio; | |
2558 | ||
2559 | bio = bio_alloc(gfp_flags, nr_vecs); | |
2560 | ||
2561 | if (bio == NULL && (current->flags & PF_MEMALLOC)) { | |
2562 | while (!bio && (nr_vecs /= 2)) | |
2563 | bio = bio_alloc(gfp_flags, nr_vecs); | |
2564 | } | |
2565 | ||
2566 | if (bio) { | |
e1c4b745 | 2567 | bio->bi_size = 0; |
d1310b2e CM |
2568 | bio->bi_bdev = bdev; |
2569 | bio->bi_sector = first_sector; | |
2570 | } | |
2571 | return bio; | |
2572 | } | |
2573 | ||
355808c2 JM |
2574 | static int __must_check submit_one_bio(int rw, struct bio *bio, |
2575 | int mirror_num, unsigned long bio_flags) | |
d1310b2e | 2576 | { |
d1310b2e | 2577 | int ret = 0; |
70dec807 CM |
2578 | struct bio_vec *bvec = bio->bi_io_vec + bio->bi_vcnt - 1; |
2579 | struct page *page = bvec->bv_page; | |
2580 | struct extent_io_tree *tree = bio->bi_private; | |
70dec807 | 2581 | u64 start; |
70dec807 | 2582 | |
4eee4fa4 | 2583 | start = page_offset(page) + bvec->bv_offset; |
70dec807 | 2584 | |
902b22f3 | 2585 | bio->bi_private = NULL; |
d1310b2e CM |
2586 | |
2587 | bio_get(bio); | |
2588 | ||
065631f6 | 2589 | if (tree->ops && tree->ops->submit_bio_hook) |
6b82ce8d | 2590 | ret = tree->ops->submit_bio_hook(page->mapping->host, rw, bio, |
eaf25d93 | 2591 | mirror_num, bio_flags, start); |
0b86a832 | 2592 | else |
21adbd5c | 2593 | btrfsic_submit_bio(rw, bio); |
4a54c8c1 | 2594 | |
d1310b2e CM |
2595 | if (bio_flagged(bio, BIO_EOPNOTSUPP)) |
2596 | ret = -EOPNOTSUPP; | |
2597 | bio_put(bio); | |
2598 | return ret; | |
2599 | } | |
2600 | ||
64a16701 | 2601 | static int merge_bio(int rw, struct extent_io_tree *tree, struct page *page, |
3444a972 JM |
2602 | unsigned long offset, size_t size, struct bio *bio, |
2603 | unsigned long bio_flags) | |
2604 | { | |
2605 | int ret = 0; | |
2606 | if (tree->ops && tree->ops->merge_bio_hook) | |
64a16701 | 2607 | ret = tree->ops->merge_bio_hook(rw, page, offset, size, bio, |
3444a972 JM |
2608 | bio_flags); |
2609 | BUG_ON(ret < 0); | |
2610 | return ret; | |
2611 | ||
2612 | } | |
2613 | ||
d1310b2e CM |
2614 | static int submit_extent_page(int rw, struct extent_io_tree *tree, |
2615 | struct page *page, sector_t sector, | |
2616 | size_t size, unsigned long offset, | |
2617 | struct block_device *bdev, | |
2618 | struct bio **bio_ret, | |
2619 | unsigned long max_pages, | |
f188591e | 2620 | bio_end_io_t end_io_func, |
c8b97818 CM |
2621 | int mirror_num, |
2622 | unsigned long prev_bio_flags, | |
2623 | unsigned long bio_flags) | |
d1310b2e CM |
2624 | { |
2625 | int ret = 0; | |
2626 | struct bio *bio; | |
2627 | int nr; | |
c8b97818 CM |
2628 | int contig = 0; |
2629 | int this_compressed = bio_flags & EXTENT_BIO_COMPRESSED; | |
2630 | int old_compressed = prev_bio_flags & EXTENT_BIO_COMPRESSED; | |
5b050f04 | 2631 | size_t page_size = min_t(size_t, size, PAGE_CACHE_SIZE); |
d1310b2e CM |
2632 | |
2633 | if (bio_ret && *bio_ret) { | |
2634 | bio = *bio_ret; | |
c8b97818 CM |
2635 | if (old_compressed) |
2636 | contig = bio->bi_sector == sector; | |
2637 | else | |
f73a1c7d | 2638 | contig = bio_end_sector(bio) == sector; |
c8b97818 CM |
2639 | |
2640 | if (prev_bio_flags != bio_flags || !contig || | |
64a16701 | 2641 | merge_bio(rw, tree, page, offset, page_size, bio, bio_flags) || |
c8b97818 CM |
2642 | bio_add_page(bio, page, page_size, offset) < page_size) { |
2643 | ret = submit_one_bio(rw, bio, mirror_num, | |
2644 | prev_bio_flags); | |
79787eaa JM |
2645 | if (ret < 0) |
2646 | return ret; | |
d1310b2e CM |
2647 | bio = NULL; |
2648 | } else { | |
2649 | return 0; | |
2650 | } | |
2651 | } | |
c8b97818 CM |
2652 | if (this_compressed) |
2653 | nr = BIO_MAX_PAGES; | |
2654 | else | |
2655 | nr = bio_get_nr_vecs(bdev); | |
2656 | ||
88f794ed | 2657 | bio = btrfs_bio_alloc(bdev, sector, nr, GFP_NOFS | __GFP_HIGH); |
5df67083 TI |
2658 | if (!bio) |
2659 | return -ENOMEM; | |
70dec807 | 2660 | |
c8b97818 | 2661 | bio_add_page(bio, page, page_size, offset); |
d1310b2e CM |
2662 | bio->bi_end_io = end_io_func; |
2663 | bio->bi_private = tree; | |
70dec807 | 2664 | |
d397712b | 2665 | if (bio_ret) |
d1310b2e | 2666 | *bio_ret = bio; |
d397712b | 2667 | else |
c8b97818 | 2668 | ret = submit_one_bio(rw, bio, mirror_num, bio_flags); |
d1310b2e CM |
2669 | |
2670 | return ret; | |
2671 | } | |
2672 | ||
48a3b636 ES |
2673 | static void attach_extent_buffer_page(struct extent_buffer *eb, |
2674 | struct page *page) | |
d1310b2e CM |
2675 | { |
2676 | if (!PagePrivate(page)) { | |
2677 | SetPagePrivate(page); | |
d1310b2e | 2678 | page_cache_get(page); |
4f2de97a JB |
2679 | set_page_private(page, (unsigned long)eb); |
2680 | } else { | |
2681 | WARN_ON(page->private != (unsigned long)eb); | |
d1310b2e CM |
2682 | } |
2683 | } | |
2684 | ||
4f2de97a | 2685 | void set_page_extent_mapped(struct page *page) |
d1310b2e | 2686 | { |
4f2de97a JB |
2687 | if (!PagePrivate(page)) { |
2688 | SetPagePrivate(page); | |
2689 | page_cache_get(page); | |
2690 | set_page_private(page, EXTENT_PAGE_PRIVATE); | |
2691 | } | |
d1310b2e CM |
2692 | } |
2693 | ||
2694 | /* | |
2695 | * basic readpage implementation. Locked extent state structs are inserted | |
2696 | * into the tree that are removed when the IO is done (by the end_io | |
2697 | * handlers) | |
79787eaa | 2698 | * XXX JDM: This needs looking at to ensure proper page locking |
d1310b2e CM |
2699 | */ |
2700 | static int __extent_read_full_page(struct extent_io_tree *tree, | |
2701 | struct page *page, | |
2702 | get_extent_t *get_extent, | |
c8b97818 | 2703 | struct bio **bio, int mirror_num, |
d4c7ca86 | 2704 | unsigned long *bio_flags, int rw) |
d1310b2e CM |
2705 | { |
2706 | struct inode *inode = page->mapping->host; | |
4eee4fa4 | 2707 | u64 start = page_offset(page); |
d1310b2e CM |
2708 | u64 page_end = start + PAGE_CACHE_SIZE - 1; |
2709 | u64 end; | |
2710 | u64 cur = start; | |
2711 | u64 extent_offset; | |
2712 | u64 last_byte = i_size_read(inode); | |
2713 | u64 block_start; | |
2714 | u64 cur_end; | |
2715 | sector_t sector; | |
2716 | struct extent_map *em; | |
2717 | struct block_device *bdev; | |
11c65dcc | 2718 | struct btrfs_ordered_extent *ordered; |
d1310b2e CM |
2719 | int ret; |
2720 | int nr = 0; | |
306e16ce | 2721 | size_t pg_offset = 0; |
d1310b2e | 2722 | size_t iosize; |
c8b97818 | 2723 | size_t disk_io_size; |
d1310b2e | 2724 | size_t blocksize = inode->i_sb->s_blocksize; |
c8b97818 | 2725 | unsigned long this_bio_flag = 0; |
d1310b2e CM |
2726 | |
2727 | set_page_extent_mapped(page); | |
2728 | ||
90a887c9 DM |
2729 | if (!PageUptodate(page)) { |
2730 | if (cleancache_get_page(page) == 0) { | |
2731 | BUG_ON(blocksize != PAGE_SIZE); | |
2732 | goto out; | |
2733 | } | |
2734 | } | |
2735 | ||
d1310b2e | 2736 | end = page_end; |
11c65dcc | 2737 | while (1) { |
d0082371 | 2738 | lock_extent(tree, start, end); |
11c65dcc JB |
2739 | ordered = btrfs_lookup_ordered_extent(inode, start); |
2740 | if (!ordered) | |
2741 | break; | |
d0082371 | 2742 | unlock_extent(tree, start, end); |
11c65dcc JB |
2743 | btrfs_start_ordered_extent(inode, ordered, 1); |
2744 | btrfs_put_ordered_extent(ordered); | |
2745 | } | |
d1310b2e | 2746 | |
c8b97818 CM |
2747 | if (page->index == last_byte >> PAGE_CACHE_SHIFT) { |
2748 | char *userpage; | |
2749 | size_t zero_offset = last_byte & (PAGE_CACHE_SIZE - 1); | |
2750 | ||
2751 | if (zero_offset) { | |
2752 | iosize = PAGE_CACHE_SIZE - zero_offset; | |
7ac687d9 | 2753 | userpage = kmap_atomic(page); |
c8b97818 CM |
2754 | memset(userpage + zero_offset, 0, iosize); |
2755 | flush_dcache_page(page); | |
7ac687d9 | 2756 | kunmap_atomic(userpage); |
c8b97818 CM |
2757 | } |
2758 | } | |
d1310b2e | 2759 | while (cur <= end) { |
c8f2f24b JB |
2760 | unsigned long pnr = (last_byte >> PAGE_CACHE_SHIFT) + 1; |
2761 | ||
d1310b2e CM |
2762 | if (cur >= last_byte) { |
2763 | char *userpage; | |
507903b8 AJ |
2764 | struct extent_state *cached = NULL; |
2765 | ||
306e16ce | 2766 | iosize = PAGE_CACHE_SIZE - pg_offset; |
7ac687d9 | 2767 | userpage = kmap_atomic(page); |
306e16ce | 2768 | memset(userpage + pg_offset, 0, iosize); |
d1310b2e | 2769 | flush_dcache_page(page); |
7ac687d9 | 2770 | kunmap_atomic(userpage); |
d1310b2e | 2771 | set_extent_uptodate(tree, cur, cur + iosize - 1, |
507903b8 AJ |
2772 | &cached, GFP_NOFS); |
2773 | unlock_extent_cached(tree, cur, cur + iosize - 1, | |
2774 | &cached, GFP_NOFS); | |
d1310b2e CM |
2775 | break; |
2776 | } | |
306e16ce | 2777 | em = get_extent(inode, page, pg_offset, cur, |
d1310b2e | 2778 | end - cur + 1, 0); |
c704005d | 2779 | if (IS_ERR_OR_NULL(em)) { |
d1310b2e | 2780 | SetPageError(page); |
d0082371 | 2781 | unlock_extent(tree, cur, end); |
d1310b2e CM |
2782 | break; |
2783 | } | |
d1310b2e CM |
2784 | extent_offset = cur - em->start; |
2785 | BUG_ON(extent_map_end(em) <= cur); | |
2786 | BUG_ON(end < cur); | |
2787 | ||
261507a0 | 2788 | if (test_bit(EXTENT_FLAG_COMPRESSED, &em->flags)) { |
c8b97818 | 2789 | this_bio_flag = EXTENT_BIO_COMPRESSED; |
261507a0 LZ |
2790 | extent_set_compress_type(&this_bio_flag, |
2791 | em->compress_type); | |
2792 | } | |
c8b97818 | 2793 | |
d1310b2e CM |
2794 | iosize = min(extent_map_end(em) - cur, end - cur + 1); |
2795 | cur_end = min(extent_map_end(em) - 1, end); | |
fda2832f | 2796 | iosize = ALIGN(iosize, blocksize); |
c8b97818 CM |
2797 | if (this_bio_flag & EXTENT_BIO_COMPRESSED) { |
2798 | disk_io_size = em->block_len; | |
2799 | sector = em->block_start >> 9; | |
2800 | } else { | |
2801 | sector = (em->block_start + extent_offset) >> 9; | |
2802 | disk_io_size = iosize; | |
2803 | } | |
d1310b2e CM |
2804 | bdev = em->bdev; |
2805 | block_start = em->block_start; | |
d899e052 YZ |
2806 | if (test_bit(EXTENT_FLAG_PREALLOC, &em->flags)) |
2807 | block_start = EXTENT_MAP_HOLE; | |
d1310b2e CM |
2808 | free_extent_map(em); |
2809 | em = NULL; | |
2810 | ||
2811 | /* we've found a hole, just zero and go on */ | |
2812 | if (block_start == EXTENT_MAP_HOLE) { | |
2813 | char *userpage; | |
507903b8 AJ |
2814 | struct extent_state *cached = NULL; |
2815 | ||
7ac687d9 | 2816 | userpage = kmap_atomic(page); |
306e16ce | 2817 | memset(userpage + pg_offset, 0, iosize); |
d1310b2e | 2818 | flush_dcache_page(page); |
7ac687d9 | 2819 | kunmap_atomic(userpage); |
d1310b2e CM |
2820 | |
2821 | set_extent_uptodate(tree, cur, cur + iosize - 1, | |
507903b8 AJ |
2822 | &cached, GFP_NOFS); |
2823 | unlock_extent_cached(tree, cur, cur + iosize - 1, | |
2824 | &cached, GFP_NOFS); | |
d1310b2e | 2825 | cur = cur + iosize; |
306e16ce | 2826 | pg_offset += iosize; |
d1310b2e CM |
2827 | continue; |
2828 | } | |
2829 | /* the get_extent function already copied into the page */ | |
9655d298 CM |
2830 | if (test_range_bit(tree, cur, cur_end, |
2831 | EXTENT_UPTODATE, 1, NULL)) { | |
a1b32a59 | 2832 | check_page_uptodate(tree, page); |
d0082371 | 2833 | unlock_extent(tree, cur, cur + iosize - 1); |
d1310b2e | 2834 | cur = cur + iosize; |
306e16ce | 2835 | pg_offset += iosize; |
d1310b2e CM |
2836 | continue; |
2837 | } | |
70dec807 CM |
2838 | /* we have an inline extent but it didn't get marked up |
2839 | * to date. Error out | |
2840 | */ | |
2841 | if (block_start == EXTENT_MAP_INLINE) { | |
2842 | SetPageError(page); | |
d0082371 | 2843 | unlock_extent(tree, cur, cur + iosize - 1); |
70dec807 | 2844 | cur = cur + iosize; |
306e16ce | 2845 | pg_offset += iosize; |
70dec807 CM |
2846 | continue; |
2847 | } | |
d1310b2e | 2848 | |
c8f2f24b | 2849 | pnr -= page->index; |
d4c7ca86 | 2850 | ret = submit_extent_page(rw, tree, page, |
306e16ce | 2851 | sector, disk_io_size, pg_offset, |
89642229 | 2852 | bdev, bio, pnr, |
c8b97818 CM |
2853 | end_bio_extent_readpage, mirror_num, |
2854 | *bio_flags, | |
2855 | this_bio_flag); | |
c8f2f24b JB |
2856 | if (!ret) { |
2857 | nr++; | |
2858 | *bio_flags = this_bio_flag; | |
2859 | } else { | |
d1310b2e | 2860 | SetPageError(page); |
edd33c99 JB |
2861 | unlock_extent(tree, cur, cur + iosize - 1); |
2862 | } | |
d1310b2e | 2863 | cur = cur + iosize; |
306e16ce | 2864 | pg_offset += iosize; |
d1310b2e | 2865 | } |
90a887c9 | 2866 | out: |
d1310b2e CM |
2867 | if (!nr) { |
2868 | if (!PageError(page)) | |
2869 | SetPageUptodate(page); | |
2870 | unlock_page(page); | |
2871 | } | |
2872 | return 0; | |
2873 | } | |
2874 | ||
2875 | int extent_read_full_page(struct extent_io_tree *tree, struct page *page, | |
8ddc7d9c | 2876 | get_extent_t *get_extent, int mirror_num) |
d1310b2e CM |
2877 | { |
2878 | struct bio *bio = NULL; | |
c8b97818 | 2879 | unsigned long bio_flags = 0; |
d1310b2e CM |
2880 | int ret; |
2881 | ||
8ddc7d9c | 2882 | ret = __extent_read_full_page(tree, page, get_extent, &bio, mirror_num, |
d4c7ca86 | 2883 | &bio_flags, READ); |
d1310b2e | 2884 | if (bio) |
8ddc7d9c | 2885 | ret = submit_one_bio(READ, bio, mirror_num, bio_flags); |
d1310b2e CM |
2886 | return ret; |
2887 | } | |
d1310b2e | 2888 | |
11c8349b CM |
2889 | static noinline void update_nr_written(struct page *page, |
2890 | struct writeback_control *wbc, | |
2891 | unsigned long nr_written) | |
2892 | { | |
2893 | wbc->nr_to_write -= nr_written; | |
2894 | if (wbc->range_cyclic || (wbc->nr_to_write > 0 && | |
2895 | wbc->range_start == 0 && wbc->range_end == LLONG_MAX)) | |
2896 | page->mapping->writeback_index = page->index + nr_written; | |
2897 | } | |
2898 | ||
d1310b2e CM |
2899 | /* |
2900 | * the writepage semantics are similar to regular writepage. extent | |
2901 | * records are inserted to lock ranges in the tree, and as dirty areas | |
2902 | * are found, they are marked writeback. Then the lock bits are removed | |
2903 | * and the end_io handler clears the writeback ranges | |
2904 | */ | |
2905 | static int __extent_writepage(struct page *page, struct writeback_control *wbc, | |
2906 | void *data) | |
2907 | { | |
2908 | struct inode *inode = page->mapping->host; | |
2909 | struct extent_page_data *epd = data; | |
2910 | struct extent_io_tree *tree = epd->tree; | |
4eee4fa4 | 2911 | u64 start = page_offset(page); |
d1310b2e CM |
2912 | u64 delalloc_start; |
2913 | u64 page_end = start + PAGE_CACHE_SIZE - 1; | |
2914 | u64 end; | |
2915 | u64 cur = start; | |
2916 | u64 extent_offset; | |
2917 | u64 last_byte = i_size_read(inode); | |
2918 | u64 block_start; | |
2919 | u64 iosize; | |
2920 | sector_t sector; | |
2c64c53d | 2921 | struct extent_state *cached_state = NULL; |
d1310b2e CM |
2922 | struct extent_map *em; |
2923 | struct block_device *bdev; | |
2924 | int ret; | |
2925 | int nr = 0; | |
7f3c74fb | 2926 | size_t pg_offset = 0; |
d1310b2e CM |
2927 | size_t blocksize; |
2928 | loff_t i_size = i_size_read(inode); | |
2929 | unsigned long end_index = i_size >> PAGE_CACHE_SHIFT; | |
2930 | u64 nr_delalloc; | |
2931 | u64 delalloc_end; | |
c8b97818 CM |
2932 | int page_started; |
2933 | int compressed; | |
ffbd517d | 2934 | int write_flags; |
771ed689 | 2935 | unsigned long nr_written = 0; |
9e487107 | 2936 | bool fill_delalloc = true; |
d1310b2e | 2937 | |
ffbd517d | 2938 | if (wbc->sync_mode == WB_SYNC_ALL) |
721a9602 | 2939 | write_flags = WRITE_SYNC; |
ffbd517d CM |
2940 | else |
2941 | write_flags = WRITE; | |
2942 | ||
1abe9b8a | 2943 | trace___extent_writepage(page, inode, wbc); |
2944 | ||
d1310b2e | 2945 | WARN_ON(!PageLocked(page)); |
bf0da8c1 CM |
2946 | |
2947 | ClearPageError(page); | |
2948 | ||
7f3c74fb | 2949 | pg_offset = i_size & (PAGE_CACHE_SIZE - 1); |
211c17f5 | 2950 | if (page->index > end_index || |
7f3c74fb | 2951 | (page->index == end_index && !pg_offset)) { |
39be25cd | 2952 | page->mapping->a_ops->invalidatepage(page, 0); |
d1310b2e CM |
2953 | unlock_page(page); |
2954 | return 0; | |
2955 | } | |
2956 | ||
2957 | if (page->index == end_index) { | |
2958 | char *userpage; | |
2959 | ||
7ac687d9 | 2960 | userpage = kmap_atomic(page); |
7f3c74fb CM |
2961 | memset(userpage + pg_offset, 0, |
2962 | PAGE_CACHE_SIZE - pg_offset); | |
7ac687d9 | 2963 | kunmap_atomic(userpage); |
211c17f5 | 2964 | flush_dcache_page(page); |
d1310b2e | 2965 | } |
7f3c74fb | 2966 | pg_offset = 0; |
d1310b2e CM |
2967 | |
2968 | set_page_extent_mapped(page); | |
2969 | ||
9e487107 JB |
2970 | if (!tree->ops || !tree->ops->fill_delalloc) |
2971 | fill_delalloc = false; | |
2972 | ||
d1310b2e CM |
2973 | delalloc_start = start; |
2974 | delalloc_end = 0; | |
c8b97818 | 2975 | page_started = 0; |
9e487107 | 2976 | if (!epd->extent_locked && fill_delalloc) { |
f85d7d6c | 2977 | u64 delalloc_to_write = 0; |
11c8349b CM |
2978 | /* |
2979 | * make sure the wbc mapping index is at least updated | |
2980 | * to this page. | |
2981 | */ | |
2982 | update_nr_written(page, wbc, 0); | |
2983 | ||
d397712b | 2984 | while (delalloc_end < page_end) { |
771ed689 | 2985 | nr_delalloc = find_lock_delalloc_range(inode, tree, |
c8b97818 CM |
2986 | page, |
2987 | &delalloc_start, | |
d1310b2e CM |
2988 | &delalloc_end, |
2989 | 128 * 1024 * 1024); | |
771ed689 CM |
2990 | if (nr_delalloc == 0) { |
2991 | delalloc_start = delalloc_end + 1; | |
2992 | continue; | |
2993 | } | |
013bd4c3 TI |
2994 | ret = tree->ops->fill_delalloc(inode, page, |
2995 | delalloc_start, | |
2996 | delalloc_end, | |
2997 | &page_started, | |
2998 | &nr_written); | |
79787eaa JM |
2999 | /* File system has been set read-only */ |
3000 | if (ret) { | |
3001 | SetPageError(page); | |
3002 | goto done; | |
3003 | } | |
f85d7d6c CM |
3004 | /* |
3005 | * delalloc_end is already one less than the total | |
3006 | * length, so we don't subtract one from | |
3007 | * PAGE_CACHE_SIZE | |
3008 | */ | |
3009 | delalloc_to_write += (delalloc_end - delalloc_start + | |
3010 | PAGE_CACHE_SIZE) >> | |
3011 | PAGE_CACHE_SHIFT; | |
d1310b2e | 3012 | delalloc_start = delalloc_end + 1; |
d1310b2e | 3013 | } |
f85d7d6c CM |
3014 | if (wbc->nr_to_write < delalloc_to_write) { |
3015 | int thresh = 8192; | |
3016 | ||
3017 | if (delalloc_to_write < thresh * 2) | |
3018 | thresh = delalloc_to_write; | |
3019 | wbc->nr_to_write = min_t(u64, delalloc_to_write, | |
3020 | thresh); | |
3021 | } | |
c8b97818 | 3022 | |
771ed689 CM |
3023 | /* did the fill delalloc function already unlock and start |
3024 | * the IO? | |
3025 | */ | |
3026 | if (page_started) { | |
3027 | ret = 0; | |
11c8349b CM |
3028 | /* |
3029 | * we've unlocked the page, so we can't update | |
3030 | * the mapping's writeback index, just update | |
3031 | * nr_to_write. | |
3032 | */ | |
3033 | wbc->nr_to_write -= nr_written; | |
3034 | goto done_unlocked; | |
771ed689 | 3035 | } |
c8b97818 | 3036 | } |
247e743c | 3037 | if (tree->ops && tree->ops->writepage_start_hook) { |
c8b97818 CM |
3038 | ret = tree->ops->writepage_start_hook(page, start, |
3039 | page_end); | |
87826df0 JM |
3040 | if (ret) { |
3041 | /* Fixup worker will requeue */ | |
3042 | if (ret == -EBUSY) | |
3043 | wbc->pages_skipped++; | |
3044 | else | |
3045 | redirty_page_for_writepage(wbc, page); | |
11c8349b | 3046 | update_nr_written(page, wbc, nr_written); |
247e743c | 3047 | unlock_page(page); |
771ed689 | 3048 | ret = 0; |
11c8349b | 3049 | goto done_unlocked; |
247e743c CM |
3050 | } |
3051 | } | |
3052 | ||
11c8349b CM |
3053 | /* |
3054 | * we don't want to touch the inode after unlocking the page, | |
3055 | * so we update the mapping writeback index now | |
3056 | */ | |
3057 | update_nr_written(page, wbc, nr_written + 1); | |
771ed689 | 3058 | |
d1310b2e | 3059 | end = page_end; |
d1310b2e | 3060 | if (last_byte <= start) { |
e6dcd2dc CM |
3061 | if (tree->ops && tree->ops->writepage_end_io_hook) |
3062 | tree->ops->writepage_end_io_hook(page, start, | |
3063 | page_end, NULL, 1); | |
d1310b2e CM |
3064 | goto done; |
3065 | } | |
3066 | ||
d1310b2e CM |
3067 | blocksize = inode->i_sb->s_blocksize; |
3068 | ||
3069 | while (cur <= end) { | |
3070 | if (cur >= last_byte) { | |
e6dcd2dc CM |
3071 | if (tree->ops && tree->ops->writepage_end_io_hook) |
3072 | tree->ops->writepage_end_io_hook(page, cur, | |
3073 | page_end, NULL, 1); | |
d1310b2e CM |
3074 | break; |
3075 | } | |
7f3c74fb | 3076 | em = epd->get_extent(inode, page, pg_offset, cur, |
d1310b2e | 3077 | end - cur + 1, 1); |
c704005d | 3078 | if (IS_ERR_OR_NULL(em)) { |
d1310b2e CM |
3079 | SetPageError(page); |
3080 | break; | |
3081 | } | |
3082 | ||
3083 | extent_offset = cur - em->start; | |
3084 | BUG_ON(extent_map_end(em) <= cur); | |
3085 | BUG_ON(end < cur); | |
3086 | iosize = min(extent_map_end(em) - cur, end - cur + 1); | |
fda2832f | 3087 | iosize = ALIGN(iosize, blocksize); |
d1310b2e CM |
3088 | sector = (em->block_start + extent_offset) >> 9; |
3089 | bdev = em->bdev; | |
3090 | block_start = em->block_start; | |
c8b97818 | 3091 | compressed = test_bit(EXTENT_FLAG_COMPRESSED, &em->flags); |
d1310b2e CM |
3092 | free_extent_map(em); |
3093 | em = NULL; | |
3094 | ||
c8b97818 CM |
3095 | /* |
3096 | * compressed and inline extents are written through other | |
3097 | * paths in the FS | |
3098 | */ | |
3099 | if (compressed || block_start == EXTENT_MAP_HOLE || | |
d1310b2e | 3100 | block_start == EXTENT_MAP_INLINE) { |
c8b97818 CM |
3101 | /* |
3102 | * end_io notification does not happen here for | |
3103 | * compressed extents | |
3104 | */ | |
3105 | if (!compressed && tree->ops && | |
3106 | tree->ops->writepage_end_io_hook) | |
e6dcd2dc CM |
3107 | tree->ops->writepage_end_io_hook(page, cur, |
3108 | cur + iosize - 1, | |
3109 | NULL, 1); | |
c8b97818 CM |
3110 | else if (compressed) { |
3111 | /* we don't want to end_page_writeback on | |
3112 | * a compressed extent. this happens | |
3113 | * elsewhere | |
3114 | */ | |
3115 | nr++; | |
3116 | } | |
3117 | ||
3118 | cur += iosize; | |
7f3c74fb | 3119 | pg_offset += iosize; |
d1310b2e CM |
3120 | continue; |
3121 | } | |
d1310b2e CM |
3122 | /* leave this out until we have a page_mkwrite call */ |
3123 | if (0 && !test_range_bit(tree, cur, cur + iosize - 1, | |
9655d298 | 3124 | EXTENT_DIRTY, 0, NULL)) { |
d1310b2e | 3125 | cur = cur + iosize; |
7f3c74fb | 3126 | pg_offset += iosize; |
d1310b2e CM |
3127 | continue; |
3128 | } | |
c8b97818 | 3129 | |
d1310b2e CM |
3130 | if (tree->ops && tree->ops->writepage_io_hook) { |
3131 | ret = tree->ops->writepage_io_hook(page, cur, | |
3132 | cur + iosize - 1); | |
3133 | } else { | |
3134 | ret = 0; | |
3135 | } | |
1259ab75 | 3136 | if (ret) { |
d1310b2e | 3137 | SetPageError(page); |
1259ab75 | 3138 | } else { |
d1310b2e | 3139 | unsigned long max_nr = end_index + 1; |
7f3c74fb | 3140 | |
d1310b2e CM |
3141 | set_range_writeback(tree, cur, cur + iosize - 1); |
3142 | if (!PageWriteback(page)) { | |
d397712b CM |
3143 | printk(KERN_ERR "btrfs warning page %lu not " |
3144 | "writeback, cur %llu end %llu\n", | |
3145 | page->index, (unsigned long long)cur, | |
d1310b2e CM |
3146 | (unsigned long long)end); |
3147 | } | |
3148 | ||
ffbd517d CM |
3149 | ret = submit_extent_page(write_flags, tree, page, |
3150 | sector, iosize, pg_offset, | |
3151 | bdev, &epd->bio, max_nr, | |
c8b97818 CM |
3152 | end_bio_extent_writepage, |
3153 | 0, 0, 0); | |
d1310b2e CM |
3154 | if (ret) |
3155 | SetPageError(page); | |
3156 | } | |
3157 | cur = cur + iosize; | |
7f3c74fb | 3158 | pg_offset += iosize; |
d1310b2e CM |
3159 | nr++; |
3160 | } | |
3161 | done: | |
3162 | if (nr == 0) { | |
3163 | /* make sure the mapping tag for page dirty gets cleared */ | |
3164 | set_page_writeback(page); | |
3165 | end_page_writeback(page); | |
3166 | } | |
d1310b2e | 3167 | unlock_page(page); |
771ed689 | 3168 | |
11c8349b CM |
3169 | done_unlocked: |
3170 | ||
2c64c53d CM |
3171 | /* drop our reference on any cached states */ |
3172 | free_extent_state(cached_state); | |
d1310b2e CM |
3173 | return 0; |
3174 | } | |
3175 | ||
0b32f4bb JB |
3176 | static int eb_wait(void *word) |
3177 | { | |
3178 | io_schedule(); | |
3179 | return 0; | |
3180 | } | |
3181 | ||
fd8b2b61 | 3182 | void wait_on_extent_buffer_writeback(struct extent_buffer *eb) |
0b32f4bb JB |
3183 | { |
3184 | wait_on_bit(&eb->bflags, EXTENT_BUFFER_WRITEBACK, eb_wait, | |
3185 | TASK_UNINTERRUPTIBLE); | |
3186 | } | |
3187 | ||
3188 | static int lock_extent_buffer_for_io(struct extent_buffer *eb, | |
3189 | struct btrfs_fs_info *fs_info, | |
3190 | struct extent_page_data *epd) | |
3191 | { | |
3192 | unsigned long i, num_pages; | |
3193 | int flush = 0; | |
3194 | int ret = 0; | |
3195 | ||
3196 | if (!btrfs_try_tree_write_lock(eb)) { | |
3197 | flush = 1; | |
3198 | flush_write_bio(epd); | |
3199 | btrfs_tree_lock(eb); | |
3200 | } | |
3201 | ||
3202 | if (test_bit(EXTENT_BUFFER_WRITEBACK, &eb->bflags)) { | |
3203 | btrfs_tree_unlock(eb); | |
3204 | if (!epd->sync_io) | |
3205 | return 0; | |
3206 | if (!flush) { | |
3207 | flush_write_bio(epd); | |
3208 | flush = 1; | |
3209 | } | |
a098d8e8 CM |
3210 | while (1) { |
3211 | wait_on_extent_buffer_writeback(eb); | |
3212 | btrfs_tree_lock(eb); | |
3213 | if (!test_bit(EXTENT_BUFFER_WRITEBACK, &eb->bflags)) | |
3214 | break; | |
0b32f4bb | 3215 | btrfs_tree_unlock(eb); |
0b32f4bb JB |
3216 | } |
3217 | } | |
3218 | ||
51561ffe JB |
3219 | /* |
3220 | * We need to do this to prevent races in people who check if the eb is | |
3221 | * under IO since we can end up having no IO bits set for a short period | |
3222 | * of time. | |
3223 | */ | |
3224 | spin_lock(&eb->refs_lock); | |
0b32f4bb JB |
3225 | if (test_and_clear_bit(EXTENT_BUFFER_DIRTY, &eb->bflags)) { |
3226 | set_bit(EXTENT_BUFFER_WRITEBACK, &eb->bflags); | |
51561ffe | 3227 | spin_unlock(&eb->refs_lock); |
0b32f4bb | 3228 | btrfs_set_header_flag(eb, BTRFS_HEADER_FLAG_WRITTEN); |
e2d84521 MX |
3229 | __percpu_counter_add(&fs_info->dirty_metadata_bytes, |
3230 | -eb->len, | |
3231 | fs_info->dirty_metadata_batch); | |
0b32f4bb | 3232 | ret = 1; |
51561ffe JB |
3233 | } else { |
3234 | spin_unlock(&eb->refs_lock); | |
0b32f4bb JB |
3235 | } |
3236 | ||
3237 | btrfs_tree_unlock(eb); | |
3238 | ||
3239 | if (!ret) | |
3240 | return ret; | |
3241 | ||
3242 | num_pages = num_extent_pages(eb->start, eb->len); | |
3243 | for (i = 0; i < num_pages; i++) { | |
3244 | struct page *p = extent_buffer_page(eb, i); | |
3245 | ||
3246 | if (!trylock_page(p)) { | |
3247 | if (!flush) { | |
3248 | flush_write_bio(epd); | |
3249 | flush = 1; | |
3250 | } | |
3251 | lock_page(p); | |
3252 | } | |
3253 | } | |
3254 | ||
3255 | return ret; | |
3256 | } | |
3257 | ||
3258 | static void end_extent_buffer_writeback(struct extent_buffer *eb) | |
3259 | { | |
3260 | clear_bit(EXTENT_BUFFER_WRITEBACK, &eb->bflags); | |
3261 | smp_mb__after_clear_bit(); | |
3262 | wake_up_bit(&eb->bflags, EXTENT_BUFFER_WRITEBACK); | |
3263 | } | |
3264 | ||
3265 | static void end_bio_extent_buffer_writepage(struct bio *bio, int err) | |
3266 | { | |
3267 | int uptodate = err == 0; | |
3268 | struct bio_vec *bvec = bio->bi_io_vec + bio->bi_vcnt - 1; | |
3269 | struct extent_buffer *eb; | |
3270 | int done; | |
3271 | ||
3272 | do { | |
3273 | struct page *page = bvec->bv_page; | |
3274 | ||
3275 | bvec--; | |
3276 | eb = (struct extent_buffer *)page->private; | |
3277 | BUG_ON(!eb); | |
3278 | done = atomic_dec_and_test(&eb->io_pages); | |
3279 | ||
3280 | if (!uptodate || test_bit(EXTENT_BUFFER_IOERR, &eb->bflags)) { | |
3281 | set_bit(EXTENT_BUFFER_IOERR, &eb->bflags); | |
3282 | ClearPageUptodate(page); | |
3283 | SetPageError(page); | |
3284 | } | |
3285 | ||
3286 | end_page_writeback(page); | |
3287 | ||
3288 | if (!done) | |
3289 | continue; | |
3290 | ||
3291 | end_extent_buffer_writeback(eb); | |
3292 | } while (bvec >= bio->bi_io_vec); | |
3293 | ||
3294 | bio_put(bio); | |
3295 | ||
3296 | } | |
3297 | ||
3298 | static int write_one_eb(struct extent_buffer *eb, | |
3299 | struct btrfs_fs_info *fs_info, | |
3300 | struct writeback_control *wbc, | |
3301 | struct extent_page_data *epd) | |
3302 | { | |
3303 | struct block_device *bdev = fs_info->fs_devices->latest_bdev; | |
3304 | u64 offset = eb->start; | |
3305 | unsigned long i, num_pages; | |
de0022b9 | 3306 | unsigned long bio_flags = 0; |
d4c7ca86 | 3307 | int rw = (epd->sync_io ? WRITE_SYNC : WRITE) | REQ_META; |
d7dbe9e7 | 3308 | int ret = 0; |
0b32f4bb JB |
3309 | |
3310 | clear_bit(EXTENT_BUFFER_IOERR, &eb->bflags); | |
3311 | num_pages = num_extent_pages(eb->start, eb->len); | |
3312 | atomic_set(&eb->io_pages, num_pages); | |
de0022b9 JB |
3313 | if (btrfs_header_owner(eb) == BTRFS_TREE_LOG_OBJECTID) |
3314 | bio_flags = EXTENT_BIO_TREE_LOG; | |
3315 | ||
0b32f4bb JB |
3316 | for (i = 0; i < num_pages; i++) { |
3317 | struct page *p = extent_buffer_page(eb, i); | |
3318 | ||
3319 | clear_page_dirty_for_io(p); | |
3320 | set_page_writeback(p); | |
3321 | ret = submit_extent_page(rw, eb->tree, p, offset >> 9, | |
3322 | PAGE_CACHE_SIZE, 0, bdev, &epd->bio, | |
3323 | -1, end_bio_extent_buffer_writepage, | |
de0022b9 JB |
3324 | 0, epd->bio_flags, bio_flags); |
3325 | epd->bio_flags = bio_flags; | |
0b32f4bb JB |
3326 | if (ret) { |
3327 | set_bit(EXTENT_BUFFER_IOERR, &eb->bflags); | |
3328 | SetPageError(p); | |
3329 | if (atomic_sub_and_test(num_pages - i, &eb->io_pages)) | |
3330 | end_extent_buffer_writeback(eb); | |
3331 | ret = -EIO; | |
3332 | break; | |
3333 | } | |
3334 | offset += PAGE_CACHE_SIZE; | |
3335 | update_nr_written(p, wbc, 1); | |
3336 | unlock_page(p); | |
3337 | } | |
3338 | ||
3339 | if (unlikely(ret)) { | |
3340 | for (; i < num_pages; i++) { | |
3341 | struct page *p = extent_buffer_page(eb, i); | |
3342 | unlock_page(p); | |
3343 | } | |
3344 | } | |
3345 | ||
3346 | return ret; | |
3347 | } | |
3348 | ||
3349 | int btree_write_cache_pages(struct address_space *mapping, | |
3350 | struct writeback_control *wbc) | |
3351 | { | |
3352 | struct extent_io_tree *tree = &BTRFS_I(mapping->host)->io_tree; | |
3353 | struct btrfs_fs_info *fs_info = BTRFS_I(mapping->host)->root->fs_info; | |
3354 | struct extent_buffer *eb, *prev_eb = NULL; | |
3355 | struct extent_page_data epd = { | |
3356 | .bio = NULL, | |
3357 | .tree = tree, | |
3358 | .extent_locked = 0, | |
3359 | .sync_io = wbc->sync_mode == WB_SYNC_ALL, | |
de0022b9 | 3360 | .bio_flags = 0, |
0b32f4bb JB |
3361 | }; |
3362 | int ret = 0; | |
3363 | int done = 0; | |
3364 | int nr_to_write_done = 0; | |
3365 | struct pagevec pvec; | |
3366 | int nr_pages; | |
3367 | pgoff_t index; | |
3368 | pgoff_t end; /* Inclusive */ | |
3369 | int scanned = 0; | |
3370 | int tag; | |
3371 | ||
3372 | pagevec_init(&pvec, 0); | |
3373 | if (wbc->range_cyclic) { | |
3374 | index = mapping->writeback_index; /* Start from prev offset */ | |
3375 | end = -1; | |
3376 | } else { | |
3377 | index = wbc->range_start >> PAGE_CACHE_SHIFT; | |
3378 | end = wbc->range_end >> PAGE_CACHE_SHIFT; | |
3379 | scanned = 1; | |
3380 | } | |
3381 | if (wbc->sync_mode == WB_SYNC_ALL) | |
3382 | tag = PAGECACHE_TAG_TOWRITE; | |
3383 | else | |
3384 | tag = PAGECACHE_TAG_DIRTY; | |
3385 | retry: | |
3386 | if (wbc->sync_mode == WB_SYNC_ALL) | |
3387 | tag_pages_for_writeback(mapping, index, end); | |
3388 | while (!done && !nr_to_write_done && (index <= end) && | |
3389 | (nr_pages = pagevec_lookup_tag(&pvec, mapping, &index, tag, | |
3390 | min(end - index, (pgoff_t)PAGEVEC_SIZE-1) + 1))) { | |
3391 | unsigned i; | |
3392 | ||
3393 | scanned = 1; | |
3394 | for (i = 0; i < nr_pages; i++) { | |
3395 | struct page *page = pvec.pages[i]; | |
3396 | ||
3397 | if (!PagePrivate(page)) | |
3398 | continue; | |
3399 | ||
3400 | if (!wbc->range_cyclic && page->index > end) { | |
3401 | done = 1; | |
3402 | break; | |
3403 | } | |
3404 | ||
b5bae261 JB |
3405 | spin_lock(&mapping->private_lock); |
3406 | if (!PagePrivate(page)) { | |
3407 | spin_unlock(&mapping->private_lock); | |
3408 | continue; | |
3409 | } | |
3410 | ||
0b32f4bb | 3411 | eb = (struct extent_buffer *)page->private; |
b5bae261 JB |
3412 | |
3413 | /* | |
3414 | * Shouldn't happen and normally this would be a BUG_ON | |
3415 | * but no sense in crashing the users box for something | |
3416 | * we can survive anyway. | |
3417 | */ | |
0b32f4bb | 3418 | if (!eb) { |
b5bae261 | 3419 | spin_unlock(&mapping->private_lock); |
0b32f4bb JB |
3420 | WARN_ON(1); |
3421 | continue; | |
3422 | } | |
3423 | ||
b5bae261 JB |
3424 | if (eb == prev_eb) { |
3425 | spin_unlock(&mapping->private_lock); | |
0b32f4bb | 3426 | continue; |
b5bae261 | 3427 | } |
0b32f4bb | 3428 | |
b5bae261 JB |
3429 | ret = atomic_inc_not_zero(&eb->refs); |
3430 | spin_unlock(&mapping->private_lock); | |
3431 | if (!ret) | |
0b32f4bb | 3432 | continue; |
0b32f4bb JB |
3433 | |
3434 | prev_eb = eb; | |
3435 | ret = lock_extent_buffer_for_io(eb, fs_info, &epd); | |
3436 | if (!ret) { | |
3437 | free_extent_buffer(eb); | |
3438 | continue; | |
3439 | } | |
3440 | ||
3441 | ret = write_one_eb(eb, fs_info, wbc, &epd); | |
3442 | if (ret) { | |
3443 | done = 1; | |
3444 | free_extent_buffer(eb); | |
3445 | break; | |
3446 | } | |
3447 | free_extent_buffer(eb); | |
3448 | ||
3449 | /* | |
3450 | * the filesystem may choose to bump up nr_to_write. | |
3451 | * We have to make sure to honor the new nr_to_write | |
3452 | * at any time | |
3453 | */ | |
3454 | nr_to_write_done = wbc->nr_to_write <= 0; | |
3455 | } | |
3456 | pagevec_release(&pvec); | |
3457 | cond_resched(); | |
3458 | } | |
3459 | if (!scanned && !done) { | |
3460 | /* | |
3461 | * We hit the last page and there is more work to be done: wrap | |
3462 | * back to the start of the file | |
3463 | */ | |
3464 | scanned = 1; | |
3465 | index = 0; | |
3466 | goto retry; | |
3467 | } | |
3468 | flush_write_bio(&epd); | |
3469 | return ret; | |
3470 | } | |
3471 | ||
d1310b2e | 3472 | /** |
4bef0848 | 3473 | * write_cache_pages - walk the list of dirty pages of the given address space and write all of them. |
d1310b2e CM |
3474 | * @mapping: address space structure to write |
3475 | * @wbc: subtract the number of written pages from *@wbc->nr_to_write | |
3476 | * @writepage: function called for each page | |
3477 | * @data: data passed to writepage function | |
3478 | * | |
3479 | * If a page is already under I/O, write_cache_pages() skips it, even | |
3480 | * if it's dirty. This is desirable behaviour for memory-cleaning writeback, | |
3481 | * but it is INCORRECT for data-integrity system calls such as fsync(). fsync() | |
3482 | * and msync() need to guarantee that all the data which was dirty at the time | |
3483 | * the call was made get new I/O started against them. If wbc->sync_mode is | |
3484 | * WB_SYNC_ALL then we were called for data integrity and we must wait for | |
3485 | * existing IO to complete. | |
3486 | */ | |
b2950863 | 3487 | static int extent_write_cache_pages(struct extent_io_tree *tree, |
4bef0848 CM |
3488 | struct address_space *mapping, |
3489 | struct writeback_control *wbc, | |
d2c3f4f6 CM |
3490 | writepage_t writepage, void *data, |
3491 | void (*flush_fn)(void *)) | |
d1310b2e | 3492 | { |
7fd1a3f7 | 3493 | struct inode *inode = mapping->host; |
d1310b2e CM |
3494 | int ret = 0; |
3495 | int done = 0; | |
f85d7d6c | 3496 | int nr_to_write_done = 0; |
d1310b2e CM |
3497 | struct pagevec pvec; |
3498 | int nr_pages; | |
3499 | pgoff_t index; | |
3500 | pgoff_t end; /* Inclusive */ | |
3501 | int scanned = 0; | |
f7aaa06b | 3502 | int tag; |
d1310b2e | 3503 | |
7fd1a3f7 JB |
3504 | /* |
3505 | * We have to hold onto the inode so that ordered extents can do their | |
3506 | * work when the IO finishes. The alternative to this is failing to add | |
3507 | * an ordered extent if the igrab() fails there and that is a huge pain | |
3508 | * to deal with, so instead just hold onto the inode throughout the | |
3509 | * writepages operation. If it fails here we are freeing up the inode | |
3510 | * anyway and we'd rather not waste our time writing out stuff that is | |
3511 | * going to be truncated anyway. | |
3512 | */ | |
3513 | if (!igrab(inode)) | |
3514 | return 0; | |
3515 | ||
d1310b2e CM |
3516 | pagevec_init(&pvec, 0); |
3517 | if (wbc->range_cyclic) { | |
3518 | index = mapping->writeback_index; /* Start from prev offset */ | |
3519 | end = -1; | |
3520 | } else { | |
3521 | index = wbc->range_start >> PAGE_CACHE_SHIFT; | |
3522 | end = wbc->range_end >> PAGE_CACHE_SHIFT; | |
d1310b2e CM |
3523 | scanned = 1; |
3524 | } | |
f7aaa06b JB |
3525 | if (wbc->sync_mode == WB_SYNC_ALL) |
3526 | tag = PAGECACHE_TAG_TOWRITE; | |
3527 | else | |
3528 | tag = PAGECACHE_TAG_DIRTY; | |
d1310b2e | 3529 | retry: |
f7aaa06b JB |
3530 | if (wbc->sync_mode == WB_SYNC_ALL) |
3531 | tag_pages_for_writeback(mapping, index, end); | |
f85d7d6c | 3532 | while (!done && !nr_to_write_done && (index <= end) && |
f7aaa06b JB |
3533 | (nr_pages = pagevec_lookup_tag(&pvec, mapping, &index, tag, |
3534 | min(end - index, (pgoff_t)PAGEVEC_SIZE-1) + 1))) { | |
d1310b2e CM |
3535 | unsigned i; |
3536 | ||
3537 | scanned = 1; | |
3538 | for (i = 0; i < nr_pages; i++) { | |
3539 | struct page *page = pvec.pages[i]; | |
3540 | ||
3541 | /* | |
3542 | * At this point we hold neither mapping->tree_lock nor | |
3543 | * lock on the page itself: the page may be truncated or | |
3544 | * invalidated (changing page->mapping to NULL), or even | |
3545 | * swizzled back from swapper_space to tmpfs file | |
3546 | * mapping | |
3547 | */ | |
c8f2f24b JB |
3548 | if (!trylock_page(page)) { |
3549 | flush_fn(data); | |
3550 | lock_page(page); | |
01d658f2 | 3551 | } |
d1310b2e CM |
3552 | |
3553 | if (unlikely(page->mapping != mapping)) { | |
3554 | unlock_page(page); | |
3555 | continue; | |
3556 | } | |
3557 | ||
3558 | if (!wbc->range_cyclic && page->index > end) { | |
3559 | done = 1; | |
3560 | unlock_page(page); | |
3561 | continue; | |
3562 | } | |
3563 | ||
d2c3f4f6 | 3564 | if (wbc->sync_mode != WB_SYNC_NONE) { |
0e6bd956 CM |
3565 | if (PageWriteback(page)) |
3566 | flush_fn(data); | |
d1310b2e | 3567 | wait_on_page_writeback(page); |
d2c3f4f6 | 3568 | } |
d1310b2e CM |
3569 | |
3570 | if (PageWriteback(page) || | |
3571 | !clear_page_dirty_for_io(page)) { | |
3572 | unlock_page(page); | |
3573 | continue; | |
3574 | } | |
3575 | ||
3576 | ret = (*writepage)(page, wbc, data); | |
3577 | ||
3578 | if (unlikely(ret == AOP_WRITEPAGE_ACTIVATE)) { | |
3579 | unlock_page(page); | |
3580 | ret = 0; | |
3581 | } | |
f85d7d6c | 3582 | if (ret) |
d1310b2e | 3583 | done = 1; |
f85d7d6c CM |
3584 | |
3585 | /* | |
3586 | * the filesystem may choose to bump up nr_to_write. | |
3587 | * We have to make sure to honor the new nr_to_write | |
3588 | * at any time | |
3589 | */ | |
3590 | nr_to_write_done = wbc->nr_to_write <= 0; | |
d1310b2e CM |
3591 | } |
3592 | pagevec_release(&pvec); | |
3593 | cond_resched(); | |
3594 | } | |
3595 | if (!scanned && !done) { | |
3596 | /* | |
3597 | * We hit the last page and there is more work to be done: wrap | |
3598 | * back to the start of the file | |
3599 | */ | |
3600 | scanned = 1; | |
3601 | index = 0; | |
3602 | goto retry; | |
3603 | } | |
7fd1a3f7 | 3604 | btrfs_add_delayed_iput(inode); |
d1310b2e CM |
3605 | return ret; |
3606 | } | |
d1310b2e | 3607 | |
ffbd517d | 3608 | static void flush_epd_write_bio(struct extent_page_data *epd) |
d2c3f4f6 | 3609 | { |
d2c3f4f6 | 3610 | if (epd->bio) { |
355808c2 JM |
3611 | int rw = WRITE; |
3612 | int ret; | |
3613 | ||
ffbd517d | 3614 | if (epd->sync_io) |
355808c2 JM |
3615 | rw = WRITE_SYNC; |
3616 | ||
de0022b9 | 3617 | ret = submit_one_bio(rw, epd->bio, 0, epd->bio_flags); |
79787eaa | 3618 | BUG_ON(ret < 0); /* -ENOMEM */ |
d2c3f4f6 CM |
3619 | epd->bio = NULL; |
3620 | } | |
3621 | } | |
3622 | ||
ffbd517d CM |
3623 | static noinline void flush_write_bio(void *data) |
3624 | { | |
3625 | struct extent_page_data *epd = data; | |
3626 | flush_epd_write_bio(epd); | |
3627 | } | |
3628 | ||
d1310b2e CM |
3629 | int extent_write_full_page(struct extent_io_tree *tree, struct page *page, |
3630 | get_extent_t *get_extent, | |
3631 | struct writeback_control *wbc) | |
3632 | { | |
3633 | int ret; | |
d1310b2e CM |
3634 | struct extent_page_data epd = { |
3635 | .bio = NULL, | |
3636 | .tree = tree, | |
3637 | .get_extent = get_extent, | |
771ed689 | 3638 | .extent_locked = 0, |
ffbd517d | 3639 | .sync_io = wbc->sync_mode == WB_SYNC_ALL, |
de0022b9 | 3640 | .bio_flags = 0, |
d1310b2e | 3641 | }; |
d1310b2e | 3642 | |
d1310b2e CM |
3643 | ret = __extent_writepage(page, wbc, &epd); |
3644 | ||
ffbd517d | 3645 | flush_epd_write_bio(&epd); |
d1310b2e CM |
3646 | return ret; |
3647 | } | |
d1310b2e | 3648 | |
771ed689 CM |
3649 | int extent_write_locked_range(struct extent_io_tree *tree, struct inode *inode, |
3650 | u64 start, u64 end, get_extent_t *get_extent, | |
3651 | int mode) | |
3652 | { | |
3653 | int ret = 0; | |
3654 | struct address_space *mapping = inode->i_mapping; | |
3655 | struct page *page; | |
3656 | unsigned long nr_pages = (end - start + PAGE_CACHE_SIZE) >> | |
3657 | PAGE_CACHE_SHIFT; | |
3658 | ||
3659 | struct extent_page_data epd = { | |
3660 | .bio = NULL, | |
3661 | .tree = tree, | |
3662 | .get_extent = get_extent, | |
3663 | .extent_locked = 1, | |
ffbd517d | 3664 | .sync_io = mode == WB_SYNC_ALL, |
de0022b9 | 3665 | .bio_flags = 0, |
771ed689 CM |
3666 | }; |
3667 | struct writeback_control wbc_writepages = { | |
771ed689 | 3668 | .sync_mode = mode, |
771ed689 CM |
3669 | .nr_to_write = nr_pages * 2, |
3670 | .range_start = start, | |
3671 | .range_end = end + 1, | |
3672 | }; | |
3673 | ||
d397712b | 3674 | while (start <= end) { |
771ed689 CM |
3675 | page = find_get_page(mapping, start >> PAGE_CACHE_SHIFT); |
3676 | if (clear_page_dirty_for_io(page)) | |
3677 | ret = __extent_writepage(page, &wbc_writepages, &epd); | |
3678 | else { | |
3679 | if (tree->ops && tree->ops->writepage_end_io_hook) | |
3680 | tree->ops->writepage_end_io_hook(page, start, | |
3681 | start + PAGE_CACHE_SIZE - 1, | |
3682 | NULL, 1); | |
3683 | unlock_page(page); | |
3684 | } | |
3685 | page_cache_release(page); | |
3686 | start += PAGE_CACHE_SIZE; | |
3687 | } | |
3688 | ||
ffbd517d | 3689 | flush_epd_write_bio(&epd); |
771ed689 CM |
3690 | return ret; |
3691 | } | |
d1310b2e CM |
3692 | |
3693 | int extent_writepages(struct extent_io_tree *tree, | |
3694 | struct address_space *mapping, | |
3695 | get_extent_t *get_extent, | |
3696 | struct writeback_control *wbc) | |
3697 | { | |
3698 | int ret = 0; | |
3699 | struct extent_page_data epd = { | |
3700 | .bio = NULL, | |
3701 | .tree = tree, | |
3702 | .get_extent = get_extent, | |
771ed689 | 3703 | .extent_locked = 0, |
ffbd517d | 3704 | .sync_io = wbc->sync_mode == WB_SYNC_ALL, |
de0022b9 | 3705 | .bio_flags = 0, |
d1310b2e CM |
3706 | }; |
3707 | ||
4bef0848 | 3708 | ret = extent_write_cache_pages(tree, mapping, wbc, |
d2c3f4f6 CM |
3709 | __extent_writepage, &epd, |
3710 | flush_write_bio); | |
ffbd517d | 3711 | flush_epd_write_bio(&epd); |
d1310b2e CM |
3712 | return ret; |
3713 | } | |
d1310b2e CM |
3714 | |
3715 | int extent_readpages(struct extent_io_tree *tree, | |
3716 | struct address_space *mapping, | |
3717 | struct list_head *pages, unsigned nr_pages, | |
3718 | get_extent_t get_extent) | |
3719 | { | |
3720 | struct bio *bio = NULL; | |
3721 | unsigned page_idx; | |
c8b97818 | 3722 | unsigned long bio_flags = 0; |
67c9684f LB |
3723 | struct page *pagepool[16]; |
3724 | struct page *page; | |
3725 | int i = 0; | |
3726 | int nr = 0; | |
d1310b2e | 3727 | |
d1310b2e | 3728 | for (page_idx = 0; page_idx < nr_pages; page_idx++) { |
67c9684f | 3729 | page = list_entry(pages->prev, struct page, lru); |
d1310b2e CM |
3730 | |
3731 | prefetchw(&page->flags); | |
3732 | list_del(&page->lru); | |
67c9684f | 3733 | if (add_to_page_cache_lru(page, mapping, |
43e817a1 | 3734 | page->index, GFP_NOFS)) { |
67c9684f LB |
3735 | page_cache_release(page); |
3736 | continue; | |
d1310b2e | 3737 | } |
67c9684f LB |
3738 | |
3739 | pagepool[nr++] = page; | |
3740 | if (nr < ARRAY_SIZE(pagepool)) | |
3741 | continue; | |
3742 | for (i = 0; i < nr; i++) { | |
3743 | __extent_read_full_page(tree, pagepool[i], get_extent, | |
d4c7ca86 | 3744 | &bio, 0, &bio_flags, READ); |
67c9684f LB |
3745 | page_cache_release(pagepool[i]); |
3746 | } | |
3747 | nr = 0; | |
d1310b2e | 3748 | } |
67c9684f LB |
3749 | for (i = 0; i < nr; i++) { |
3750 | __extent_read_full_page(tree, pagepool[i], get_extent, | |
d4c7ca86 | 3751 | &bio, 0, &bio_flags, READ); |
67c9684f | 3752 | page_cache_release(pagepool[i]); |
d1310b2e | 3753 | } |
67c9684f | 3754 | |
d1310b2e CM |
3755 | BUG_ON(!list_empty(pages)); |
3756 | if (bio) | |
79787eaa | 3757 | return submit_one_bio(READ, bio, 0, bio_flags); |
d1310b2e CM |
3758 | return 0; |
3759 | } | |
d1310b2e CM |
3760 | |
3761 | /* | |
3762 | * basic invalidatepage code, this waits on any locked or writeback | |
3763 | * ranges corresponding to the page, and then deletes any extent state | |
3764 | * records from the tree | |
3765 | */ | |
3766 | int extent_invalidatepage(struct extent_io_tree *tree, | |
3767 | struct page *page, unsigned long offset) | |
3768 | { | |
2ac55d41 | 3769 | struct extent_state *cached_state = NULL; |
4eee4fa4 | 3770 | u64 start = page_offset(page); |
d1310b2e CM |
3771 | u64 end = start + PAGE_CACHE_SIZE - 1; |
3772 | size_t blocksize = page->mapping->host->i_sb->s_blocksize; | |
3773 | ||
fda2832f | 3774 | start += ALIGN(offset, blocksize); |
d1310b2e CM |
3775 | if (start > end) |
3776 | return 0; | |
3777 | ||
d0082371 | 3778 | lock_extent_bits(tree, start, end, 0, &cached_state); |
1edbb734 | 3779 | wait_on_page_writeback(page); |
d1310b2e | 3780 | clear_extent_bit(tree, start, end, |
32c00aff JB |
3781 | EXTENT_LOCKED | EXTENT_DIRTY | EXTENT_DELALLOC | |
3782 | EXTENT_DO_ACCOUNTING, | |
2ac55d41 | 3783 | 1, 1, &cached_state, GFP_NOFS); |
d1310b2e CM |
3784 | return 0; |
3785 | } | |
d1310b2e | 3786 | |
7b13b7b1 CM |
3787 | /* |
3788 | * a helper for releasepage, this tests for areas of the page that | |
3789 | * are locked or under IO and drops the related state bits if it is safe | |
3790 | * to drop the page. | |
3791 | */ | |
48a3b636 ES |
3792 | static int try_release_extent_state(struct extent_map_tree *map, |
3793 | struct extent_io_tree *tree, | |
3794 | struct page *page, gfp_t mask) | |
7b13b7b1 | 3795 | { |
4eee4fa4 | 3796 | u64 start = page_offset(page); |
7b13b7b1 CM |
3797 | u64 end = start + PAGE_CACHE_SIZE - 1; |
3798 | int ret = 1; | |
3799 | ||
211f90e6 | 3800 | if (test_range_bit(tree, start, end, |
8b62b72b | 3801 | EXTENT_IOBITS, 0, NULL)) |
7b13b7b1 CM |
3802 | ret = 0; |
3803 | else { | |
3804 | if ((mask & GFP_NOFS) == GFP_NOFS) | |
3805 | mask = GFP_NOFS; | |
11ef160f CM |
3806 | /* |
3807 | * at this point we can safely clear everything except the | |
3808 | * locked bit and the nodatasum bit | |
3809 | */ | |
e3f24cc5 | 3810 | ret = clear_extent_bit(tree, start, end, |
11ef160f CM |
3811 | ~(EXTENT_LOCKED | EXTENT_NODATASUM), |
3812 | 0, 0, NULL, mask); | |
e3f24cc5 CM |
3813 | |
3814 | /* if clear_extent_bit failed for enomem reasons, | |
3815 | * we can't allow the release to continue. | |
3816 | */ | |
3817 | if (ret < 0) | |
3818 | ret = 0; | |
3819 | else | |
3820 | ret = 1; | |
7b13b7b1 CM |
3821 | } |
3822 | return ret; | |
3823 | } | |
7b13b7b1 | 3824 | |
d1310b2e CM |
3825 | /* |
3826 | * a helper for releasepage. As long as there are no locked extents | |
3827 | * in the range corresponding to the page, both state records and extent | |
3828 | * map records are removed | |
3829 | */ | |
3830 | int try_release_extent_mapping(struct extent_map_tree *map, | |
70dec807 CM |
3831 | struct extent_io_tree *tree, struct page *page, |
3832 | gfp_t mask) | |
d1310b2e CM |
3833 | { |
3834 | struct extent_map *em; | |
4eee4fa4 | 3835 | u64 start = page_offset(page); |
d1310b2e | 3836 | u64 end = start + PAGE_CACHE_SIZE - 1; |
7b13b7b1 | 3837 | |
70dec807 CM |
3838 | if ((mask & __GFP_WAIT) && |
3839 | page->mapping->host->i_size > 16 * 1024 * 1024) { | |
39b5637f | 3840 | u64 len; |
70dec807 | 3841 | while (start <= end) { |
39b5637f | 3842 | len = end - start + 1; |
890871be | 3843 | write_lock(&map->lock); |
39b5637f | 3844 | em = lookup_extent_mapping(map, start, len); |
285190d9 | 3845 | if (!em) { |
890871be | 3846 | write_unlock(&map->lock); |
70dec807 CM |
3847 | break; |
3848 | } | |
7f3c74fb CM |
3849 | if (test_bit(EXTENT_FLAG_PINNED, &em->flags) || |
3850 | em->start != start) { | |
890871be | 3851 | write_unlock(&map->lock); |
70dec807 CM |
3852 | free_extent_map(em); |
3853 | break; | |
3854 | } | |
3855 | if (!test_range_bit(tree, em->start, | |
3856 | extent_map_end(em) - 1, | |
8b62b72b | 3857 | EXTENT_LOCKED | EXTENT_WRITEBACK, |
9655d298 | 3858 | 0, NULL)) { |
70dec807 CM |
3859 | remove_extent_mapping(map, em); |
3860 | /* once for the rb tree */ | |
3861 | free_extent_map(em); | |
3862 | } | |
3863 | start = extent_map_end(em); | |
890871be | 3864 | write_unlock(&map->lock); |
70dec807 CM |
3865 | |
3866 | /* once for us */ | |
d1310b2e CM |
3867 | free_extent_map(em); |
3868 | } | |
d1310b2e | 3869 | } |
7b13b7b1 | 3870 | return try_release_extent_state(map, tree, page, mask); |
d1310b2e | 3871 | } |
d1310b2e | 3872 | |
ec29ed5b CM |
3873 | /* |
3874 | * helper function for fiemap, which doesn't want to see any holes. | |
3875 | * This maps until we find something past 'last' | |
3876 | */ | |
3877 | static struct extent_map *get_extent_skip_holes(struct inode *inode, | |
3878 | u64 offset, | |
3879 | u64 last, | |
3880 | get_extent_t *get_extent) | |
3881 | { | |
3882 | u64 sectorsize = BTRFS_I(inode)->root->sectorsize; | |
3883 | struct extent_map *em; | |
3884 | u64 len; | |
3885 | ||
3886 | if (offset >= last) | |
3887 | return NULL; | |
3888 | ||
3889 | while(1) { | |
3890 | len = last - offset; | |
3891 | if (len == 0) | |
3892 | break; | |
fda2832f | 3893 | len = ALIGN(len, sectorsize); |
ec29ed5b | 3894 | em = get_extent(inode, NULL, 0, offset, len, 0); |
c704005d | 3895 | if (IS_ERR_OR_NULL(em)) |
ec29ed5b CM |
3896 | return em; |
3897 | ||
3898 | /* if this isn't a hole return it */ | |
3899 | if (!test_bit(EXTENT_FLAG_VACANCY, &em->flags) && | |
3900 | em->block_start != EXTENT_MAP_HOLE) { | |
3901 | return em; | |
3902 | } | |
3903 | ||
3904 | /* this is a hole, advance to the next extent */ | |
3905 | offset = extent_map_end(em); | |
3906 | free_extent_map(em); | |
3907 | if (offset >= last) | |
3908 | break; | |
3909 | } | |
3910 | return NULL; | |
3911 | } | |
3912 | ||
1506fcc8 YS |
3913 | int extent_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, |
3914 | __u64 start, __u64 len, get_extent_t *get_extent) | |
3915 | { | |
975f84fe | 3916 | int ret = 0; |
1506fcc8 YS |
3917 | u64 off = start; |
3918 | u64 max = start + len; | |
3919 | u32 flags = 0; | |
975f84fe JB |
3920 | u32 found_type; |
3921 | u64 last; | |
ec29ed5b | 3922 | u64 last_for_get_extent = 0; |
1506fcc8 | 3923 | u64 disko = 0; |
ec29ed5b | 3924 | u64 isize = i_size_read(inode); |
975f84fe | 3925 | struct btrfs_key found_key; |
1506fcc8 | 3926 | struct extent_map *em = NULL; |
2ac55d41 | 3927 | struct extent_state *cached_state = NULL; |
975f84fe JB |
3928 | struct btrfs_path *path; |
3929 | struct btrfs_file_extent_item *item; | |
1506fcc8 | 3930 | int end = 0; |
ec29ed5b CM |
3931 | u64 em_start = 0; |
3932 | u64 em_len = 0; | |
3933 | u64 em_end = 0; | |
1506fcc8 | 3934 | unsigned long emflags; |
1506fcc8 YS |
3935 | |
3936 | if (len == 0) | |
3937 | return -EINVAL; | |
3938 | ||
975f84fe JB |
3939 | path = btrfs_alloc_path(); |
3940 | if (!path) | |
3941 | return -ENOMEM; | |
3942 | path->leave_spinning = 1; | |
3943 | ||
4d479cf0 JB |
3944 | start = ALIGN(start, BTRFS_I(inode)->root->sectorsize); |
3945 | len = ALIGN(len, BTRFS_I(inode)->root->sectorsize); | |
3946 | ||
ec29ed5b CM |
3947 | /* |
3948 | * lookup the last file extent. We're not using i_size here | |
3949 | * because there might be preallocation past i_size | |
3950 | */ | |
975f84fe | 3951 | ret = btrfs_lookup_file_extent(NULL, BTRFS_I(inode)->root, |
33345d01 | 3952 | path, btrfs_ino(inode), -1, 0); |
975f84fe JB |
3953 | if (ret < 0) { |
3954 | btrfs_free_path(path); | |
3955 | return ret; | |
3956 | } | |
3957 | WARN_ON(!ret); | |
3958 | path->slots[0]--; | |
3959 | item = btrfs_item_ptr(path->nodes[0], path->slots[0], | |
3960 | struct btrfs_file_extent_item); | |
3961 | btrfs_item_key_to_cpu(path->nodes[0], &found_key, path->slots[0]); | |
3962 | found_type = btrfs_key_type(&found_key); | |
3963 | ||
ec29ed5b | 3964 | /* No extents, but there might be delalloc bits */ |
33345d01 | 3965 | if (found_key.objectid != btrfs_ino(inode) || |
975f84fe | 3966 | found_type != BTRFS_EXTENT_DATA_KEY) { |
ec29ed5b CM |
3967 | /* have to trust i_size as the end */ |
3968 | last = (u64)-1; | |
3969 | last_for_get_extent = isize; | |
3970 | } else { | |
3971 | /* | |
3972 | * remember the start of the last extent. There are a | |
3973 | * bunch of different factors that go into the length of the | |
3974 | * extent, so its much less complex to remember where it started | |
3975 | */ | |
3976 | last = found_key.offset; | |
3977 | last_for_get_extent = last + 1; | |
975f84fe | 3978 | } |
975f84fe JB |
3979 | btrfs_free_path(path); |
3980 | ||
ec29ed5b CM |
3981 | /* |
3982 | * we might have some extents allocated but more delalloc past those | |
3983 | * extents. so, we trust isize unless the start of the last extent is | |
3984 | * beyond isize | |
3985 | */ | |
3986 | if (last < isize) { | |
3987 | last = (u64)-1; | |
3988 | last_for_get_extent = isize; | |
3989 | } | |
3990 | ||
2ac55d41 | 3991 | lock_extent_bits(&BTRFS_I(inode)->io_tree, start, start + len, 0, |
d0082371 | 3992 | &cached_state); |
ec29ed5b | 3993 | |
4d479cf0 | 3994 | em = get_extent_skip_holes(inode, start, last_for_get_extent, |
ec29ed5b | 3995 | get_extent); |
1506fcc8 YS |
3996 | if (!em) |
3997 | goto out; | |
3998 | if (IS_ERR(em)) { | |
3999 | ret = PTR_ERR(em); | |
4000 | goto out; | |
4001 | } | |
975f84fe | 4002 | |
1506fcc8 | 4003 | while (!end) { |
ea8efc74 CM |
4004 | u64 offset_in_extent; |
4005 | ||
4006 | /* break if the extent we found is outside the range */ | |
4007 | if (em->start >= max || extent_map_end(em) < off) | |
4008 | break; | |
4009 | ||
4010 | /* | |
4011 | * get_extent may return an extent that starts before our | |
4012 | * requested range. We have to make sure the ranges | |
4013 | * we return to fiemap always move forward and don't | |
4014 | * overlap, so adjust the offsets here | |
4015 | */ | |
4016 | em_start = max(em->start, off); | |
1506fcc8 | 4017 | |
ea8efc74 CM |
4018 | /* |
4019 | * record the offset from the start of the extent | |
4020 | * for adjusting the disk offset below | |
4021 | */ | |
4022 | offset_in_extent = em_start - em->start; | |
ec29ed5b | 4023 | em_end = extent_map_end(em); |
ea8efc74 | 4024 | em_len = em_end - em_start; |
ec29ed5b | 4025 | emflags = em->flags; |
1506fcc8 YS |
4026 | disko = 0; |
4027 | flags = 0; | |
4028 | ||
ea8efc74 CM |
4029 | /* |
4030 | * bump off for our next call to get_extent | |
4031 | */ | |
4032 | off = extent_map_end(em); | |
4033 | if (off >= max) | |
4034 | end = 1; | |
4035 | ||
93dbfad7 | 4036 | if (em->block_start == EXTENT_MAP_LAST_BYTE) { |
1506fcc8 YS |
4037 | end = 1; |
4038 | flags |= FIEMAP_EXTENT_LAST; | |
93dbfad7 | 4039 | } else if (em->block_start == EXTENT_MAP_INLINE) { |
1506fcc8 YS |
4040 | flags |= (FIEMAP_EXTENT_DATA_INLINE | |
4041 | FIEMAP_EXTENT_NOT_ALIGNED); | |
93dbfad7 | 4042 | } else if (em->block_start == EXTENT_MAP_DELALLOC) { |
1506fcc8 YS |
4043 | flags |= (FIEMAP_EXTENT_DELALLOC | |
4044 | FIEMAP_EXTENT_UNKNOWN); | |
93dbfad7 | 4045 | } else { |
ea8efc74 | 4046 | disko = em->block_start + offset_in_extent; |
1506fcc8 YS |
4047 | } |
4048 | if (test_bit(EXTENT_FLAG_COMPRESSED, &em->flags)) | |
4049 | flags |= FIEMAP_EXTENT_ENCODED; | |
4050 | ||
1506fcc8 YS |
4051 | free_extent_map(em); |
4052 | em = NULL; | |
ec29ed5b CM |
4053 | if ((em_start >= last) || em_len == (u64)-1 || |
4054 | (last == (u64)-1 && isize <= em_end)) { | |
1506fcc8 YS |
4055 | flags |= FIEMAP_EXTENT_LAST; |
4056 | end = 1; | |
4057 | } | |
4058 | ||
ec29ed5b CM |
4059 | /* now scan forward to see if this is really the last extent. */ |
4060 | em = get_extent_skip_holes(inode, off, last_for_get_extent, | |
4061 | get_extent); | |
4062 | if (IS_ERR(em)) { | |
4063 | ret = PTR_ERR(em); | |
4064 | goto out; | |
4065 | } | |
4066 | if (!em) { | |
975f84fe JB |
4067 | flags |= FIEMAP_EXTENT_LAST; |
4068 | end = 1; | |
4069 | } | |
ec29ed5b CM |
4070 | ret = fiemap_fill_next_extent(fieinfo, em_start, disko, |
4071 | em_len, flags); | |
4072 | if (ret) | |
4073 | goto out_free; | |
1506fcc8 YS |
4074 | } |
4075 | out_free: | |
4076 | free_extent_map(em); | |
4077 | out: | |
2ac55d41 JB |
4078 | unlock_extent_cached(&BTRFS_I(inode)->io_tree, start, start + len, |
4079 | &cached_state, GFP_NOFS); | |
1506fcc8 YS |
4080 | return ret; |
4081 | } | |
4082 | ||
727011e0 CM |
4083 | static void __free_extent_buffer(struct extent_buffer *eb) |
4084 | { | |
6d49ba1b | 4085 | btrfs_leak_debug_del(&eb->leak_list); |
727011e0 CM |
4086 | kmem_cache_free(extent_buffer_cache, eb); |
4087 | } | |
4088 | ||
d1310b2e CM |
4089 | static struct extent_buffer *__alloc_extent_buffer(struct extent_io_tree *tree, |
4090 | u64 start, | |
4091 | unsigned long len, | |
4092 | gfp_t mask) | |
4093 | { | |
4094 | struct extent_buffer *eb = NULL; | |
4095 | ||
d1310b2e | 4096 | eb = kmem_cache_zalloc(extent_buffer_cache, mask); |
91ca338d TI |
4097 | if (eb == NULL) |
4098 | return NULL; | |
d1310b2e CM |
4099 | eb->start = start; |
4100 | eb->len = len; | |
4f2de97a | 4101 | eb->tree = tree; |
815a51c7 | 4102 | eb->bflags = 0; |
bd681513 CM |
4103 | rwlock_init(&eb->lock); |
4104 | atomic_set(&eb->write_locks, 0); | |
4105 | atomic_set(&eb->read_locks, 0); | |
4106 | atomic_set(&eb->blocking_readers, 0); | |
4107 | atomic_set(&eb->blocking_writers, 0); | |
4108 | atomic_set(&eb->spinning_readers, 0); | |
4109 | atomic_set(&eb->spinning_writers, 0); | |
5b25f70f | 4110 | eb->lock_nested = 0; |
bd681513 CM |
4111 | init_waitqueue_head(&eb->write_lock_wq); |
4112 | init_waitqueue_head(&eb->read_lock_wq); | |
b4ce94de | 4113 | |
6d49ba1b ES |
4114 | btrfs_leak_debug_add(&eb->leak_list, &buffers); |
4115 | ||
3083ee2e | 4116 | spin_lock_init(&eb->refs_lock); |
d1310b2e | 4117 | atomic_set(&eb->refs, 1); |
0b32f4bb | 4118 | atomic_set(&eb->io_pages, 0); |
727011e0 | 4119 | |
b8dae313 DS |
4120 | /* |
4121 | * Sanity checks, currently the maximum is 64k covered by 16x 4k pages | |
4122 | */ | |
4123 | BUILD_BUG_ON(BTRFS_MAX_METADATA_BLOCKSIZE | |
4124 | > MAX_INLINE_EXTENT_BUFFER_SIZE); | |
4125 | BUG_ON(len > MAX_INLINE_EXTENT_BUFFER_SIZE); | |
d1310b2e CM |
4126 | |
4127 | return eb; | |
4128 | } | |
4129 | ||
815a51c7 JS |
4130 | struct extent_buffer *btrfs_clone_extent_buffer(struct extent_buffer *src) |
4131 | { | |
4132 | unsigned long i; | |
4133 | struct page *p; | |
4134 | struct extent_buffer *new; | |
4135 | unsigned long num_pages = num_extent_pages(src->start, src->len); | |
4136 | ||
4137 | new = __alloc_extent_buffer(NULL, src->start, src->len, GFP_ATOMIC); | |
4138 | if (new == NULL) | |
4139 | return NULL; | |
4140 | ||
4141 | for (i = 0; i < num_pages; i++) { | |
4142 | p = alloc_page(GFP_ATOMIC); | |
4143 | BUG_ON(!p); | |
4144 | attach_extent_buffer_page(new, p); | |
4145 | WARN_ON(PageDirty(p)); | |
4146 | SetPageUptodate(p); | |
4147 | new->pages[i] = p; | |
4148 | } | |
4149 | ||
4150 | copy_extent_buffer(new, src, 0, 0, src->len); | |
4151 | set_bit(EXTENT_BUFFER_UPTODATE, &new->bflags); | |
4152 | set_bit(EXTENT_BUFFER_DUMMY, &new->bflags); | |
4153 | ||
4154 | return new; | |
4155 | } | |
4156 | ||
4157 | struct extent_buffer *alloc_dummy_extent_buffer(u64 start, unsigned long len) | |
4158 | { | |
4159 | struct extent_buffer *eb; | |
4160 | unsigned long num_pages = num_extent_pages(0, len); | |
4161 | unsigned long i; | |
4162 | ||
4163 | eb = __alloc_extent_buffer(NULL, start, len, GFP_ATOMIC); | |
4164 | if (!eb) | |
4165 | return NULL; | |
4166 | ||
4167 | for (i = 0; i < num_pages; i++) { | |
4168 | eb->pages[i] = alloc_page(GFP_ATOMIC); | |
4169 | if (!eb->pages[i]) | |
4170 | goto err; | |
4171 | } | |
4172 | set_extent_buffer_uptodate(eb); | |
4173 | btrfs_set_header_nritems(eb, 0); | |
4174 | set_bit(EXTENT_BUFFER_DUMMY, &eb->bflags); | |
4175 | ||
4176 | return eb; | |
4177 | err: | |
84167d19 SB |
4178 | for (; i > 0; i--) |
4179 | __free_page(eb->pages[i - 1]); | |
815a51c7 JS |
4180 | __free_extent_buffer(eb); |
4181 | return NULL; | |
4182 | } | |
4183 | ||
0b32f4bb | 4184 | static int extent_buffer_under_io(struct extent_buffer *eb) |
d1310b2e | 4185 | { |
0b32f4bb JB |
4186 | return (atomic_read(&eb->io_pages) || |
4187 | test_bit(EXTENT_BUFFER_WRITEBACK, &eb->bflags) || | |
4188 | test_bit(EXTENT_BUFFER_DIRTY, &eb->bflags)); | |
d1310b2e CM |
4189 | } |
4190 | ||
897ca6e9 MX |
4191 | /* |
4192 | * Helper for releasing extent buffer page. | |
4193 | */ | |
4194 | static void btrfs_release_extent_buffer_page(struct extent_buffer *eb, | |
4195 | unsigned long start_idx) | |
4196 | { | |
4197 | unsigned long index; | |
39bab87b | 4198 | unsigned long num_pages; |
897ca6e9 | 4199 | struct page *page; |
815a51c7 | 4200 | int mapped = !test_bit(EXTENT_BUFFER_DUMMY, &eb->bflags); |
897ca6e9 | 4201 | |
0b32f4bb | 4202 | BUG_ON(extent_buffer_under_io(eb)); |
897ca6e9 | 4203 | |
39bab87b WSH |
4204 | num_pages = num_extent_pages(eb->start, eb->len); |
4205 | index = start_idx + num_pages; | |
897ca6e9 MX |
4206 | if (start_idx >= index) |
4207 | return; | |
4208 | ||
4209 | do { | |
4210 | index--; | |
4211 | page = extent_buffer_page(eb, index); | |
815a51c7 | 4212 | if (page && mapped) { |
4f2de97a JB |
4213 | spin_lock(&page->mapping->private_lock); |
4214 | /* | |
4215 | * We do this since we'll remove the pages after we've | |
4216 | * removed the eb from the radix tree, so we could race | |
4217 | * and have this page now attached to the new eb. So | |
4218 | * only clear page_private if it's still connected to | |
4219 | * this eb. | |
4220 | */ | |
4221 | if (PagePrivate(page) && | |
4222 | page->private == (unsigned long)eb) { | |
0b32f4bb | 4223 | BUG_ON(test_bit(EXTENT_BUFFER_DIRTY, &eb->bflags)); |
3083ee2e JB |
4224 | BUG_ON(PageDirty(page)); |
4225 | BUG_ON(PageWriteback(page)); | |
4f2de97a JB |
4226 | /* |
4227 | * We need to make sure we haven't be attached | |
4228 | * to a new eb. | |
4229 | */ | |
4230 | ClearPagePrivate(page); | |
4231 | set_page_private(page, 0); | |
4232 | /* One for the page private */ | |
4233 | page_cache_release(page); | |
4234 | } | |
4235 | spin_unlock(&page->mapping->private_lock); | |
4236 | ||
815a51c7 JS |
4237 | } |
4238 | if (page) { | |
4f2de97a | 4239 | /* One for when we alloced the page */ |
897ca6e9 | 4240 | page_cache_release(page); |
4f2de97a | 4241 | } |
897ca6e9 MX |
4242 | } while (index != start_idx); |
4243 | } | |
4244 | ||
4245 | /* | |
4246 | * Helper for releasing the extent buffer. | |
4247 | */ | |
4248 | static inline void btrfs_release_extent_buffer(struct extent_buffer *eb) | |
4249 | { | |
4250 | btrfs_release_extent_buffer_page(eb, 0); | |
4251 | __free_extent_buffer(eb); | |
4252 | } | |
4253 | ||
0b32f4bb JB |
4254 | static void check_buffer_tree_ref(struct extent_buffer *eb) |
4255 | { | |
242e18c7 | 4256 | int refs; |
0b32f4bb JB |
4257 | /* the ref bit is tricky. We have to make sure it is set |
4258 | * if we have the buffer dirty. Otherwise the | |
4259 | * code to free a buffer can end up dropping a dirty | |
4260 | * page | |
4261 | * | |
4262 | * Once the ref bit is set, it won't go away while the | |
4263 | * buffer is dirty or in writeback, and it also won't | |
4264 | * go away while we have the reference count on the | |
4265 | * eb bumped. | |
4266 | * | |
4267 | * We can't just set the ref bit without bumping the | |
4268 | * ref on the eb because free_extent_buffer might | |
4269 | * see the ref bit and try to clear it. If this happens | |
4270 | * free_extent_buffer might end up dropping our original | |
4271 | * ref by mistake and freeing the page before we are able | |
4272 | * to add one more ref. | |
4273 | * | |
4274 | * So bump the ref count first, then set the bit. If someone | |
4275 | * beat us to it, drop the ref we added. | |
4276 | */ | |
242e18c7 CM |
4277 | refs = atomic_read(&eb->refs); |
4278 | if (refs >= 2 && test_bit(EXTENT_BUFFER_TREE_REF, &eb->bflags)) | |
4279 | return; | |
4280 | ||
594831c4 JB |
4281 | spin_lock(&eb->refs_lock); |
4282 | if (!test_and_set_bit(EXTENT_BUFFER_TREE_REF, &eb->bflags)) | |
0b32f4bb | 4283 | atomic_inc(&eb->refs); |
594831c4 | 4284 | spin_unlock(&eb->refs_lock); |
0b32f4bb JB |
4285 | } |
4286 | ||
5df4235e JB |
4287 | static void mark_extent_buffer_accessed(struct extent_buffer *eb) |
4288 | { | |
4289 | unsigned long num_pages, i; | |
4290 | ||
0b32f4bb JB |
4291 | check_buffer_tree_ref(eb); |
4292 | ||
5df4235e JB |
4293 | num_pages = num_extent_pages(eb->start, eb->len); |
4294 | for (i = 0; i < num_pages; i++) { | |
4295 | struct page *p = extent_buffer_page(eb, i); | |
4296 | mark_page_accessed(p); | |
4297 | } | |
4298 | } | |
4299 | ||
d1310b2e | 4300 | struct extent_buffer *alloc_extent_buffer(struct extent_io_tree *tree, |
727011e0 | 4301 | u64 start, unsigned long len) |
d1310b2e CM |
4302 | { |
4303 | unsigned long num_pages = num_extent_pages(start, len); | |
4304 | unsigned long i; | |
4305 | unsigned long index = start >> PAGE_CACHE_SHIFT; | |
4306 | struct extent_buffer *eb; | |
6af118ce | 4307 | struct extent_buffer *exists = NULL; |
d1310b2e CM |
4308 | struct page *p; |
4309 | struct address_space *mapping = tree->mapping; | |
4310 | int uptodate = 1; | |
19fe0a8b | 4311 | int ret; |
d1310b2e | 4312 | |
19fe0a8b MX |
4313 | rcu_read_lock(); |
4314 | eb = radix_tree_lookup(&tree->buffer, start >> PAGE_CACHE_SHIFT); | |
4315 | if (eb && atomic_inc_not_zero(&eb->refs)) { | |
4316 | rcu_read_unlock(); | |
5df4235e | 4317 | mark_extent_buffer_accessed(eb); |
6af118ce CM |
4318 | return eb; |
4319 | } | |
19fe0a8b | 4320 | rcu_read_unlock(); |
6af118ce | 4321 | |
ba144192 | 4322 | eb = __alloc_extent_buffer(tree, start, len, GFP_NOFS); |
2b114d1d | 4323 | if (!eb) |
d1310b2e CM |
4324 | return NULL; |
4325 | ||
727011e0 | 4326 | for (i = 0; i < num_pages; i++, index++) { |
a6591715 | 4327 | p = find_or_create_page(mapping, index, GFP_NOFS); |
4804b382 | 4328 | if (!p) |
6af118ce | 4329 | goto free_eb; |
4f2de97a JB |
4330 | |
4331 | spin_lock(&mapping->private_lock); | |
4332 | if (PagePrivate(p)) { | |
4333 | /* | |
4334 | * We could have already allocated an eb for this page | |
4335 | * and attached one so lets see if we can get a ref on | |
4336 | * the existing eb, and if we can we know it's good and | |
4337 | * we can just return that one, else we know we can just | |
4338 | * overwrite page->private. | |
4339 | */ | |
4340 | exists = (struct extent_buffer *)p->private; | |
4341 | if (atomic_inc_not_zero(&exists->refs)) { | |
4342 | spin_unlock(&mapping->private_lock); | |
4343 | unlock_page(p); | |
17de39ac | 4344 | page_cache_release(p); |
5df4235e | 4345 | mark_extent_buffer_accessed(exists); |
4f2de97a JB |
4346 | goto free_eb; |
4347 | } | |
4348 | ||
0b32f4bb | 4349 | /* |
4f2de97a JB |
4350 | * Do this so attach doesn't complain and we need to |
4351 | * drop the ref the old guy had. | |
4352 | */ | |
4353 | ClearPagePrivate(p); | |
0b32f4bb | 4354 | WARN_ON(PageDirty(p)); |
4f2de97a | 4355 | page_cache_release(p); |
d1310b2e | 4356 | } |
4f2de97a JB |
4357 | attach_extent_buffer_page(eb, p); |
4358 | spin_unlock(&mapping->private_lock); | |
0b32f4bb | 4359 | WARN_ON(PageDirty(p)); |
d1310b2e | 4360 | mark_page_accessed(p); |
727011e0 | 4361 | eb->pages[i] = p; |
d1310b2e CM |
4362 | if (!PageUptodate(p)) |
4363 | uptodate = 0; | |
eb14ab8e CM |
4364 | |
4365 | /* | |
4366 | * see below about how we avoid a nasty race with release page | |
4367 | * and why we unlock later | |
4368 | */ | |
d1310b2e CM |
4369 | } |
4370 | if (uptodate) | |
b4ce94de | 4371 | set_bit(EXTENT_BUFFER_UPTODATE, &eb->bflags); |
115391d2 | 4372 | again: |
19fe0a8b MX |
4373 | ret = radix_tree_preload(GFP_NOFS & ~__GFP_HIGHMEM); |
4374 | if (ret) | |
4375 | goto free_eb; | |
4376 | ||
6af118ce | 4377 | spin_lock(&tree->buffer_lock); |
19fe0a8b MX |
4378 | ret = radix_tree_insert(&tree->buffer, start >> PAGE_CACHE_SHIFT, eb); |
4379 | if (ret == -EEXIST) { | |
4380 | exists = radix_tree_lookup(&tree->buffer, | |
4381 | start >> PAGE_CACHE_SHIFT); | |
115391d2 JB |
4382 | if (!atomic_inc_not_zero(&exists->refs)) { |
4383 | spin_unlock(&tree->buffer_lock); | |
4384 | radix_tree_preload_end(); | |
115391d2 JB |
4385 | exists = NULL; |
4386 | goto again; | |
4387 | } | |
6af118ce | 4388 | spin_unlock(&tree->buffer_lock); |
19fe0a8b | 4389 | radix_tree_preload_end(); |
5df4235e | 4390 | mark_extent_buffer_accessed(exists); |
6af118ce CM |
4391 | goto free_eb; |
4392 | } | |
6af118ce | 4393 | /* add one reference for the tree */ |
0b32f4bb | 4394 | check_buffer_tree_ref(eb); |
f044ba78 | 4395 | spin_unlock(&tree->buffer_lock); |
19fe0a8b | 4396 | radix_tree_preload_end(); |
eb14ab8e CM |
4397 | |
4398 | /* | |
4399 | * there is a race where release page may have | |
4400 | * tried to find this extent buffer in the radix | |
4401 | * but failed. It will tell the VM it is safe to | |
4402 | * reclaim the, and it will clear the page private bit. | |
4403 | * We must make sure to set the page private bit properly | |
4404 | * after the extent buffer is in the radix tree so | |
4405 | * it doesn't get lost | |
4406 | */ | |
727011e0 CM |
4407 | SetPageChecked(eb->pages[0]); |
4408 | for (i = 1; i < num_pages; i++) { | |
4409 | p = extent_buffer_page(eb, i); | |
727011e0 CM |
4410 | ClearPageChecked(p); |
4411 | unlock_page(p); | |
4412 | } | |
4413 | unlock_page(eb->pages[0]); | |
d1310b2e CM |
4414 | return eb; |
4415 | ||
6af118ce | 4416 | free_eb: |
727011e0 CM |
4417 | for (i = 0; i < num_pages; i++) { |
4418 | if (eb->pages[i]) | |
4419 | unlock_page(eb->pages[i]); | |
4420 | } | |
eb14ab8e | 4421 | |
17de39ac | 4422 | WARN_ON(!atomic_dec_and_test(&eb->refs)); |
897ca6e9 | 4423 | btrfs_release_extent_buffer(eb); |
6af118ce | 4424 | return exists; |
d1310b2e | 4425 | } |
d1310b2e CM |
4426 | |
4427 | struct extent_buffer *find_extent_buffer(struct extent_io_tree *tree, | |
f09d1f60 | 4428 | u64 start, unsigned long len) |
d1310b2e | 4429 | { |
d1310b2e | 4430 | struct extent_buffer *eb; |
d1310b2e | 4431 | |
19fe0a8b MX |
4432 | rcu_read_lock(); |
4433 | eb = radix_tree_lookup(&tree->buffer, start >> PAGE_CACHE_SHIFT); | |
4434 | if (eb && atomic_inc_not_zero(&eb->refs)) { | |
4435 | rcu_read_unlock(); | |
5df4235e | 4436 | mark_extent_buffer_accessed(eb); |
19fe0a8b MX |
4437 | return eb; |
4438 | } | |
4439 | rcu_read_unlock(); | |
0f9dd46c | 4440 | |
19fe0a8b | 4441 | return NULL; |
d1310b2e | 4442 | } |
d1310b2e | 4443 | |
3083ee2e JB |
4444 | static inline void btrfs_release_extent_buffer_rcu(struct rcu_head *head) |
4445 | { | |
4446 | struct extent_buffer *eb = | |
4447 | container_of(head, struct extent_buffer, rcu_head); | |
4448 | ||
4449 | __free_extent_buffer(eb); | |
4450 | } | |
4451 | ||
3083ee2e | 4452 | /* Expects to have eb->eb_lock already held */ |
f7a52a40 | 4453 | static int release_extent_buffer(struct extent_buffer *eb) |
3083ee2e JB |
4454 | { |
4455 | WARN_ON(atomic_read(&eb->refs) == 0); | |
4456 | if (atomic_dec_and_test(&eb->refs)) { | |
815a51c7 JS |
4457 | if (test_bit(EXTENT_BUFFER_DUMMY, &eb->bflags)) { |
4458 | spin_unlock(&eb->refs_lock); | |
4459 | } else { | |
4460 | struct extent_io_tree *tree = eb->tree; | |
3083ee2e | 4461 | |
815a51c7 | 4462 | spin_unlock(&eb->refs_lock); |
3083ee2e | 4463 | |
815a51c7 JS |
4464 | spin_lock(&tree->buffer_lock); |
4465 | radix_tree_delete(&tree->buffer, | |
4466 | eb->start >> PAGE_CACHE_SHIFT); | |
4467 | spin_unlock(&tree->buffer_lock); | |
4468 | } | |
3083ee2e JB |
4469 | |
4470 | /* Should be safe to release our pages at this point */ | |
4471 | btrfs_release_extent_buffer_page(eb, 0); | |
3083ee2e | 4472 | call_rcu(&eb->rcu_head, btrfs_release_extent_buffer_rcu); |
e64860aa | 4473 | return 1; |
3083ee2e JB |
4474 | } |
4475 | spin_unlock(&eb->refs_lock); | |
e64860aa JB |
4476 | |
4477 | return 0; | |
3083ee2e JB |
4478 | } |
4479 | ||
d1310b2e CM |
4480 | void free_extent_buffer(struct extent_buffer *eb) |
4481 | { | |
242e18c7 CM |
4482 | int refs; |
4483 | int old; | |
d1310b2e CM |
4484 | if (!eb) |
4485 | return; | |
4486 | ||
242e18c7 CM |
4487 | while (1) { |
4488 | refs = atomic_read(&eb->refs); | |
4489 | if (refs <= 3) | |
4490 | break; | |
4491 | old = atomic_cmpxchg(&eb->refs, refs, refs - 1); | |
4492 | if (old == refs) | |
4493 | return; | |
4494 | } | |
4495 | ||
3083ee2e | 4496 | spin_lock(&eb->refs_lock); |
815a51c7 JS |
4497 | if (atomic_read(&eb->refs) == 2 && |
4498 | test_bit(EXTENT_BUFFER_DUMMY, &eb->bflags)) | |
4499 | atomic_dec(&eb->refs); | |
4500 | ||
3083ee2e JB |
4501 | if (atomic_read(&eb->refs) == 2 && |
4502 | test_bit(EXTENT_BUFFER_STALE, &eb->bflags) && | |
0b32f4bb | 4503 | !extent_buffer_under_io(eb) && |
3083ee2e JB |
4504 | test_and_clear_bit(EXTENT_BUFFER_TREE_REF, &eb->bflags)) |
4505 | atomic_dec(&eb->refs); | |
4506 | ||
4507 | /* | |
4508 | * I know this is terrible, but it's temporary until we stop tracking | |
4509 | * the uptodate bits and such for the extent buffers. | |
4510 | */ | |
f7a52a40 | 4511 | release_extent_buffer(eb); |
3083ee2e JB |
4512 | } |
4513 | ||
4514 | void free_extent_buffer_stale(struct extent_buffer *eb) | |
4515 | { | |
4516 | if (!eb) | |
d1310b2e CM |
4517 | return; |
4518 | ||
3083ee2e JB |
4519 | spin_lock(&eb->refs_lock); |
4520 | set_bit(EXTENT_BUFFER_STALE, &eb->bflags); | |
4521 | ||
0b32f4bb | 4522 | if (atomic_read(&eb->refs) == 2 && !extent_buffer_under_io(eb) && |
3083ee2e JB |
4523 | test_and_clear_bit(EXTENT_BUFFER_TREE_REF, &eb->bflags)) |
4524 | atomic_dec(&eb->refs); | |
f7a52a40 | 4525 | release_extent_buffer(eb); |
d1310b2e | 4526 | } |
d1310b2e | 4527 | |
1d4284bd | 4528 | void clear_extent_buffer_dirty(struct extent_buffer *eb) |
d1310b2e | 4529 | { |
d1310b2e CM |
4530 | unsigned long i; |
4531 | unsigned long num_pages; | |
4532 | struct page *page; | |
4533 | ||
d1310b2e CM |
4534 | num_pages = num_extent_pages(eb->start, eb->len); |
4535 | ||
4536 | for (i = 0; i < num_pages; i++) { | |
4537 | page = extent_buffer_page(eb, i); | |
b9473439 | 4538 | if (!PageDirty(page)) |
d2c3f4f6 CM |
4539 | continue; |
4540 | ||
a61e6f29 | 4541 | lock_page(page); |
eb14ab8e CM |
4542 | WARN_ON(!PagePrivate(page)); |
4543 | ||
d1310b2e | 4544 | clear_page_dirty_for_io(page); |
0ee0fda0 | 4545 | spin_lock_irq(&page->mapping->tree_lock); |
d1310b2e CM |
4546 | if (!PageDirty(page)) { |
4547 | radix_tree_tag_clear(&page->mapping->page_tree, | |
4548 | page_index(page), | |
4549 | PAGECACHE_TAG_DIRTY); | |
4550 | } | |
0ee0fda0 | 4551 | spin_unlock_irq(&page->mapping->tree_lock); |
bf0da8c1 | 4552 | ClearPageError(page); |
a61e6f29 | 4553 | unlock_page(page); |
d1310b2e | 4554 | } |
0b32f4bb | 4555 | WARN_ON(atomic_read(&eb->refs) == 0); |
d1310b2e | 4556 | } |
d1310b2e | 4557 | |
0b32f4bb | 4558 | int set_extent_buffer_dirty(struct extent_buffer *eb) |
d1310b2e CM |
4559 | { |
4560 | unsigned long i; | |
4561 | unsigned long num_pages; | |
b9473439 | 4562 | int was_dirty = 0; |
d1310b2e | 4563 | |
0b32f4bb JB |
4564 | check_buffer_tree_ref(eb); |
4565 | ||
b9473439 | 4566 | was_dirty = test_and_set_bit(EXTENT_BUFFER_DIRTY, &eb->bflags); |
0b32f4bb | 4567 | |
d1310b2e | 4568 | num_pages = num_extent_pages(eb->start, eb->len); |
3083ee2e | 4569 | WARN_ON(atomic_read(&eb->refs) == 0); |
0b32f4bb JB |
4570 | WARN_ON(!test_bit(EXTENT_BUFFER_TREE_REF, &eb->bflags)); |
4571 | ||
b9473439 | 4572 | for (i = 0; i < num_pages; i++) |
0b32f4bb | 4573 | set_page_dirty(extent_buffer_page(eb, i)); |
b9473439 | 4574 | return was_dirty; |
d1310b2e | 4575 | } |
d1310b2e | 4576 | |
0b32f4bb | 4577 | int clear_extent_buffer_uptodate(struct extent_buffer *eb) |
1259ab75 CM |
4578 | { |
4579 | unsigned long i; | |
4580 | struct page *page; | |
4581 | unsigned long num_pages; | |
4582 | ||
b4ce94de | 4583 | clear_bit(EXTENT_BUFFER_UPTODATE, &eb->bflags); |
0b32f4bb | 4584 | num_pages = num_extent_pages(eb->start, eb->len); |
1259ab75 CM |
4585 | for (i = 0; i < num_pages; i++) { |
4586 | page = extent_buffer_page(eb, i); | |
33958dc6 CM |
4587 | if (page) |
4588 | ClearPageUptodate(page); | |
1259ab75 CM |
4589 | } |
4590 | return 0; | |
4591 | } | |
4592 | ||
0b32f4bb | 4593 | int set_extent_buffer_uptodate(struct extent_buffer *eb) |
d1310b2e CM |
4594 | { |
4595 | unsigned long i; | |
4596 | struct page *page; | |
4597 | unsigned long num_pages; | |
4598 | ||
0b32f4bb | 4599 | set_bit(EXTENT_BUFFER_UPTODATE, &eb->bflags); |
d1310b2e | 4600 | num_pages = num_extent_pages(eb->start, eb->len); |
d1310b2e CM |
4601 | for (i = 0; i < num_pages; i++) { |
4602 | page = extent_buffer_page(eb, i); | |
d1310b2e CM |
4603 | SetPageUptodate(page); |
4604 | } | |
4605 | return 0; | |
4606 | } | |
d1310b2e | 4607 | |
0b32f4bb | 4608 | int extent_buffer_uptodate(struct extent_buffer *eb) |
d1310b2e | 4609 | { |
0b32f4bb | 4610 | return test_bit(EXTENT_BUFFER_UPTODATE, &eb->bflags); |
d1310b2e | 4611 | } |
d1310b2e CM |
4612 | |
4613 | int read_extent_buffer_pages(struct extent_io_tree *tree, | |
bb82ab88 | 4614 | struct extent_buffer *eb, u64 start, int wait, |
f188591e | 4615 | get_extent_t *get_extent, int mirror_num) |
d1310b2e CM |
4616 | { |
4617 | unsigned long i; | |
4618 | unsigned long start_i; | |
4619 | struct page *page; | |
4620 | int err; | |
4621 | int ret = 0; | |
ce9adaa5 CM |
4622 | int locked_pages = 0; |
4623 | int all_uptodate = 1; | |
d1310b2e | 4624 | unsigned long num_pages; |
727011e0 | 4625 | unsigned long num_reads = 0; |
a86c12c7 | 4626 | struct bio *bio = NULL; |
c8b97818 | 4627 | unsigned long bio_flags = 0; |
a86c12c7 | 4628 | |
b4ce94de | 4629 | if (test_bit(EXTENT_BUFFER_UPTODATE, &eb->bflags)) |
d1310b2e CM |
4630 | return 0; |
4631 | ||
d1310b2e CM |
4632 | if (start) { |
4633 | WARN_ON(start < eb->start); | |
4634 | start_i = (start >> PAGE_CACHE_SHIFT) - | |
4635 | (eb->start >> PAGE_CACHE_SHIFT); | |
4636 | } else { | |
4637 | start_i = 0; | |
4638 | } | |
4639 | ||
4640 | num_pages = num_extent_pages(eb->start, eb->len); | |
4641 | for (i = start_i; i < num_pages; i++) { | |
4642 | page = extent_buffer_page(eb, i); | |
bb82ab88 | 4643 | if (wait == WAIT_NONE) { |
2db04966 | 4644 | if (!trylock_page(page)) |
ce9adaa5 | 4645 | goto unlock_exit; |
d1310b2e CM |
4646 | } else { |
4647 | lock_page(page); | |
4648 | } | |
ce9adaa5 | 4649 | locked_pages++; |
727011e0 CM |
4650 | if (!PageUptodate(page)) { |
4651 | num_reads++; | |
ce9adaa5 | 4652 | all_uptodate = 0; |
727011e0 | 4653 | } |
ce9adaa5 CM |
4654 | } |
4655 | if (all_uptodate) { | |
4656 | if (start_i == 0) | |
b4ce94de | 4657 | set_bit(EXTENT_BUFFER_UPTODATE, &eb->bflags); |
ce9adaa5 CM |
4658 | goto unlock_exit; |
4659 | } | |
4660 | ||
ea466794 | 4661 | clear_bit(EXTENT_BUFFER_IOERR, &eb->bflags); |
5cf1ab56 | 4662 | eb->read_mirror = 0; |
0b32f4bb | 4663 | atomic_set(&eb->io_pages, num_reads); |
ce9adaa5 CM |
4664 | for (i = start_i; i < num_pages; i++) { |
4665 | page = extent_buffer_page(eb, i); | |
ce9adaa5 | 4666 | if (!PageUptodate(page)) { |
f188591e | 4667 | ClearPageError(page); |
a86c12c7 | 4668 | err = __extent_read_full_page(tree, page, |
f188591e | 4669 | get_extent, &bio, |
d4c7ca86 JB |
4670 | mirror_num, &bio_flags, |
4671 | READ | REQ_META); | |
d397712b | 4672 | if (err) |
d1310b2e | 4673 | ret = err; |
d1310b2e CM |
4674 | } else { |
4675 | unlock_page(page); | |
4676 | } | |
4677 | } | |
4678 | ||
355808c2 | 4679 | if (bio) { |
d4c7ca86 JB |
4680 | err = submit_one_bio(READ | REQ_META, bio, mirror_num, |
4681 | bio_flags); | |
79787eaa JM |
4682 | if (err) |
4683 | return err; | |
355808c2 | 4684 | } |
a86c12c7 | 4685 | |
bb82ab88 | 4686 | if (ret || wait != WAIT_COMPLETE) |
d1310b2e | 4687 | return ret; |
d397712b | 4688 | |
d1310b2e CM |
4689 | for (i = start_i; i < num_pages; i++) { |
4690 | page = extent_buffer_page(eb, i); | |
4691 | wait_on_page_locked(page); | |
d397712b | 4692 | if (!PageUptodate(page)) |
d1310b2e | 4693 | ret = -EIO; |
d1310b2e | 4694 | } |
d397712b | 4695 | |
d1310b2e | 4696 | return ret; |
ce9adaa5 CM |
4697 | |
4698 | unlock_exit: | |
4699 | i = start_i; | |
d397712b | 4700 | while (locked_pages > 0) { |
ce9adaa5 CM |
4701 | page = extent_buffer_page(eb, i); |
4702 | i++; | |
4703 | unlock_page(page); | |
4704 | locked_pages--; | |
4705 | } | |
4706 | return ret; | |
d1310b2e | 4707 | } |
d1310b2e CM |
4708 | |
4709 | void read_extent_buffer(struct extent_buffer *eb, void *dstv, | |
4710 | unsigned long start, | |
4711 | unsigned long len) | |
4712 | { | |
4713 | size_t cur; | |
4714 | size_t offset; | |
4715 | struct page *page; | |
4716 | char *kaddr; | |
4717 | char *dst = (char *)dstv; | |
4718 | size_t start_offset = eb->start & ((u64)PAGE_CACHE_SIZE - 1); | |
4719 | unsigned long i = (start_offset + start) >> PAGE_CACHE_SHIFT; | |
d1310b2e CM |
4720 | |
4721 | WARN_ON(start > eb->len); | |
4722 | WARN_ON(start + len > eb->start + eb->len); | |
4723 | ||
4724 | offset = (start_offset + start) & ((unsigned long)PAGE_CACHE_SIZE - 1); | |
4725 | ||
d397712b | 4726 | while (len > 0) { |
d1310b2e | 4727 | page = extent_buffer_page(eb, i); |
d1310b2e CM |
4728 | |
4729 | cur = min(len, (PAGE_CACHE_SIZE - offset)); | |
a6591715 | 4730 | kaddr = page_address(page); |
d1310b2e | 4731 | memcpy(dst, kaddr + offset, cur); |
d1310b2e CM |
4732 | |
4733 | dst += cur; | |
4734 | len -= cur; | |
4735 | offset = 0; | |
4736 | i++; | |
4737 | } | |
4738 | } | |
d1310b2e CM |
4739 | |
4740 | int map_private_extent_buffer(struct extent_buffer *eb, unsigned long start, | |
a6591715 | 4741 | unsigned long min_len, char **map, |
d1310b2e | 4742 | unsigned long *map_start, |
a6591715 | 4743 | unsigned long *map_len) |
d1310b2e CM |
4744 | { |
4745 | size_t offset = start & (PAGE_CACHE_SIZE - 1); | |
4746 | char *kaddr; | |
4747 | struct page *p; | |
4748 | size_t start_offset = eb->start & ((u64)PAGE_CACHE_SIZE - 1); | |
4749 | unsigned long i = (start_offset + start) >> PAGE_CACHE_SHIFT; | |
4750 | unsigned long end_i = (start_offset + start + min_len - 1) >> | |
4751 | PAGE_CACHE_SHIFT; | |
4752 | ||
4753 | if (i != end_i) | |
4754 | return -EINVAL; | |
4755 | ||
4756 | if (i == 0) { | |
4757 | offset = start_offset; | |
4758 | *map_start = 0; | |
4759 | } else { | |
4760 | offset = 0; | |
4761 | *map_start = ((u64)i << PAGE_CACHE_SHIFT) - start_offset; | |
4762 | } | |
d397712b | 4763 | |
d1310b2e | 4764 | if (start + min_len > eb->len) { |
31b1a2bd | 4765 | WARN(1, KERN_ERR "btrfs bad mapping eb start %llu len %lu, " |
d397712b CM |
4766 | "wanted %lu %lu\n", (unsigned long long)eb->start, |
4767 | eb->len, start, min_len); | |
85026533 | 4768 | return -EINVAL; |
d1310b2e CM |
4769 | } |
4770 | ||
4771 | p = extent_buffer_page(eb, i); | |
a6591715 | 4772 | kaddr = page_address(p); |
d1310b2e CM |
4773 | *map = kaddr + offset; |
4774 | *map_len = PAGE_CACHE_SIZE - offset; | |
4775 | return 0; | |
4776 | } | |
d1310b2e | 4777 | |
d1310b2e CM |
4778 | int memcmp_extent_buffer(struct extent_buffer *eb, const void *ptrv, |
4779 | unsigned long start, | |
4780 | unsigned long len) | |
4781 | { | |
4782 | size_t cur; | |
4783 | size_t offset; | |
4784 | struct page *page; | |
4785 | char *kaddr; | |
4786 | char *ptr = (char *)ptrv; | |
4787 | size_t start_offset = eb->start & ((u64)PAGE_CACHE_SIZE - 1); | |
4788 | unsigned long i = (start_offset + start) >> PAGE_CACHE_SHIFT; | |
4789 | int ret = 0; | |
4790 | ||
4791 | WARN_ON(start > eb->len); | |
4792 | WARN_ON(start + len > eb->start + eb->len); | |
4793 | ||
4794 | offset = (start_offset + start) & ((unsigned long)PAGE_CACHE_SIZE - 1); | |
4795 | ||
d397712b | 4796 | while (len > 0) { |
d1310b2e | 4797 | page = extent_buffer_page(eb, i); |
d1310b2e CM |
4798 | |
4799 | cur = min(len, (PAGE_CACHE_SIZE - offset)); | |
4800 | ||
a6591715 | 4801 | kaddr = page_address(page); |
d1310b2e | 4802 | ret = memcmp(ptr, kaddr + offset, cur); |
d1310b2e CM |
4803 | if (ret) |
4804 | break; | |
4805 | ||
4806 | ptr += cur; | |
4807 | len -= cur; | |
4808 | offset = 0; | |
4809 | i++; | |
4810 | } | |
4811 | return ret; | |
4812 | } | |
d1310b2e CM |
4813 | |
4814 | void write_extent_buffer(struct extent_buffer *eb, const void *srcv, | |
4815 | unsigned long start, unsigned long len) | |
4816 | { | |
4817 | size_t cur; | |
4818 | size_t offset; | |
4819 | struct page *page; | |
4820 | char *kaddr; | |
4821 | char *src = (char *)srcv; | |
4822 | size_t start_offset = eb->start & ((u64)PAGE_CACHE_SIZE - 1); | |
4823 | unsigned long i = (start_offset + start) >> PAGE_CACHE_SHIFT; | |
4824 | ||
4825 | WARN_ON(start > eb->len); | |
4826 | WARN_ON(start + len > eb->start + eb->len); | |
4827 | ||
4828 | offset = (start_offset + start) & ((unsigned long)PAGE_CACHE_SIZE - 1); | |
4829 | ||
d397712b | 4830 | while (len > 0) { |
d1310b2e CM |
4831 | page = extent_buffer_page(eb, i); |
4832 | WARN_ON(!PageUptodate(page)); | |
4833 | ||
4834 | cur = min(len, PAGE_CACHE_SIZE - offset); | |
a6591715 | 4835 | kaddr = page_address(page); |
d1310b2e | 4836 | memcpy(kaddr + offset, src, cur); |
d1310b2e CM |
4837 | |
4838 | src += cur; | |
4839 | len -= cur; | |
4840 | offset = 0; | |
4841 | i++; | |
4842 | } | |
4843 | } | |
d1310b2e CM |
4844 | |
4845 | void memset_extent_buffer(struct extent_buffer *eb, char c, | |
4846 | unsigned long start, unsigned long len) | |
4847 | { | |
4848 | size_t cur; | |
4849 | size_t offset; | |
4850 | struct page *page; | |
4851 | char *kaddr; | |
4852 | size_t start_offset = eb->start & ((u64)PAGE_CACHE_SIZE - 1); | |
4853 | unsigned long i = (start_offset + start) >> PAGE_CACHE_SHIFT; | |
4854 | ||
4855 | WARN_ON(start > eb->len); | |
4856 | WARN_ON(start + len > eb->start + eb->len); | |
4857 | ||
4858 | offset = (start_offset + start) & ((unsigned long)PAGE_CACHE_SIZE - 1); | |
4859 | ||
d397712b | 4860 | while (len > 0) { |
d1310b2e CM |
4861 | page = extent_buffer_page(eb, i); |
4862 | WARN_ON(!PageUptodate(page)); | |
4863 | ||
4864 | cur = min(len, PAGE_CACHE_SIZE - offset); | |
a6591715 | 4865 | kaddr = page_address(page); |
d1310b2e | 4866 | memset(kaddr + offset, c, cur); |
d1310b2e CM |
4867 | |
4868 | len -= cur; | |
4869 | offset = 0; | |
4870 | i++; | |
4871 | } | |
4872 | } | |
d1310b2e CM |
4873 | |
4874 | void copy_extent_buffer(struct extent_buffer *dst, struct extent_buffer *src, | |
4875 | unsigned long dst_offset, unsigned long src_offset, | |
4876 | unsigned long len) | |
4877 | { | |
4878 | u64 dst_len = dst->len; | |
4879 | size_t cur; | |
4880 | size_t offset; | |
4881 | struct page *page; | |
4882 | char *kaddr; | |
4883 | size_t start_offset = dst->start & ((u64)PAGE_CACHE_SIZE - 1); | |
4884 | unsigned long i = (start_offset + dst_offset) >> PAGE_CACHE_SHIFT; | |
4885 | ||
4886 | WARN_ON(src->len != dst_len); | |
4887 | ||
4888 | offset = (start_offset + dst_offset) & | |
4889 | ((unsigned long)PAGE_CACHE_SIZE - 1); | |
4890 | ||
d397712b | 4891 | while (len > 0) { |
d1310b2e CM |
4892 | page = extent_buffer_page(dst, i); |
4893 | WARN_ON(!PageUptodate(page)); | |
4894 | ||
4895 | cur = min(len, (unsigned long)(PAGE_CACHE_SIZE - offset)); | |
4896 | ||
a6591715 | 4897 | kaddr = page_address(page); |
d1310b2e | 4898 | read_extent_buffer(src, kaddr + offset, src_offset, cur); |
d1310b2e CM |
4899 | |
4900 | src_offset += cur; | |
4901 | len -= cur; | |
4902 | offset = 0; | |
4903 | i++; | |
4904 | } | |
4905 | } | |
d1310b2e CM |
4906 | |
4907 | static void move_pages(struct page *dst_page, struct page *src_page, | |
4908 | unsigned long dst_off, unsigned long src_off, | |
4909 | unsigned long len) | |
4910 | { | |
a6591715 | 4911 | char *dst_kaddr = page_address(dst_page); |
d1310b2e CM |
4912 | if (dst_page == src_page) { |
4913 | memmove(dst_kaddr + dst_off, dst_kaddr + src_off, len); | |
4914 | } else { | |
a6591715 | 4915 | char *src_kaddr = page_address(src_page); |
d1310b2e CM |
4916 | char *p = dst_kaddr + dst_off + len; |
4917 | char *s = src_kaddr + src_off + len; | |
4918 | ||
4919 | while (len--) | |
4920 | *--p = *--s; | |
d1310b2e | 4921 | } |
d1310b2e CM |
4922 | } |
4923 | ||
3387206f ST |
4924 | static inline bool areas_overlap(unsigned long src, unsigned long dst, unsigned long len) |
4925 | { | |
4926 | unsigned long distance = (src > dst) ? src - dst : dst - src; | |
4927 | return distance < len; | |
4928 | } | |
4929 | ||
d1310b2e CM |
4930 | static void copy_pages(struct page *dst_page, struct page *src_page, |
4931 | unsigned long dst_off, unsigned long src_off, | |
4932 | unsigned long len) | |
4933 | { | |
a6591715 | 4934 | char *dst_kaddr = page_address(dst_page); |
d1310b2e | 4935 | char *src_kaddr; |
727011e0 | 4936 | int must_memmove = 0; |
d1310b2e | 4937 | |
3387206f | 4938 | if (dst_page != src_page) { |
a6591715 | 4939 | src_kaddr = page_address(src_page); |
3387206f | 4940 | } else { |
d1310b2e | 4941 | src_kaddr = dst_kaddr; |
727011e0 CM |
4942 | if (areas_overlap(src_off, dst_off, len)) |
4943 | must_memmove = 1; | |
3387206f | 4944 | } |
d1310b2e | 4945 | |
727011e0 CM |
4946 | if (must_memmove) |
4947 | memmove(dst_kaddr + dst_off, src_kaddr + src_off, len); | |
4948 | else | |
4949 | memcpy(dst_kaddr + dst_off, src_kaddr + src_off, len); | |
d1310b2e CM |
4950 | } |
4951 | ||
4952 | void memcpy_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset, | |
4953 | unsigned long src_offset, unsigned long len) | |
4954 | { | |
4955 | size_t cur; | |
4956 | size_t dst_off_in_page; | |
4957 | size_t src_off_in_page; | |
4958 | size_t start_offset = dst->start & ((u64)PAGE_CACHE_SIZE - 1); | |
4959 | unsigned long dst_i; | |
4960 | unsigned long src_i; | |
4961 | ||
4962 | if (src_offset + len > dst->len) { | |
d397712b CM |
4963 | printk(KERN_ERR "btrfs memmove bogus src_offset %lu move " |
4964 | "len %lu dst len %lu\n", src_offset, len, dst->len); | |
d1310b2e CM |
4965 | BUG_ON(1); |
4966 | } | |
4967 | if (dst_offset + len > dst->len) { | |
d397712b CM |
4968 | printk(KERN_ERR "btrfs memmove bogus dst_offset %lu move " |
4969 | "len %lu dst len %lu\n", dst_offset, len, dst->len); | |
d1310b2e CM |
4970 | BUG_ON(1); |
4971 | } | |
4972 | ||
d397712b | 4973 | while (len > 0) { |
d1310b2e CM |
4974 | dst_off_in_page = (start_offset + dst_offset) & |
4975 | ((unsigned long)PAGE_CACHE_SIZE - 1); | |
4976 | src_off_in_page = (start_offset + src_offset) & | |
4977 | ((unsigned long)PAGE_CACHE_SIZE - 1); | |
4978 | ||
4979 | dst_i = (start_offset + dst_offset) >> PAGE_CACHE_SHIFT; | |
4980 | src_i = (start_offset + src_offset) >> PAGE_CACHE_SHIFT; | |
4981 | ||
4982 | cur = min(len, (unsigned long)(PAGE_CACHE_SIZE - | |
4983 | src_off_in_page)); | |
4984 | cur = min_t(unsigned long, cur, | |
4985 | (unsigned long)(PAGE_CACHE_SIZE - dst_off_in_page)); | |
4986 | ||
4987 | copy_pages(extent_buffer_page(dst, dst_i), | |
4988 | extent_buffer_page(dst, src_i), | |
4989 | dst_off_in_page, src_off_in_page, cur); | |
4990 | ||
4991 | src_offset += cur; | |
4992 | dst_offset += cur; | |
4993 | len -= cur; | |
4994 | } | |
4995 | } | |
d1310b2e CM |
4996 | |
4997 | void memmove_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset, | |
4998 | unsigned long src_offset, unsigned long len) | |
4999 | { | |
5000 | size_t cur; | |
5001 | size_t dst_off_in_page; | |
5002 | size_t src_off_in_page; | |
5003 | unsigned long dst_end = dst_offset + len - 1; | |
5004 | unsigned long src_end = src_offset + len - 1; | |
5005 | size_t start_offset = dst->start & ((u64)PAGE_CACHE_SIZE - 1); | |
5006 | unsigned long dst_i; | |
5007 | unsigned long src_i; | |
5008 | ||
5009 | if (src_offset + len > dst->len) { | |
d397712b CM |
5010 | printk(KERN_ERR "btrfs memmove bogus src_offset %lu move " |
5011 | "len %lu len %lu\n", src_offset, len, dst->len); | |
d1310b2e CM |
5012 | BUG_ON(1); |
5013 | } | |
5014 | if (dst_offset + len > dst->len) { | |
d397712b CM |
5015 | printk(KERN_ERR "btrfs memmove bogus dst_offset %lu move " |
5016 | "len %lu len %lu\n", dst_offset, len, dst->len); | |
d1310b2e CM |
5017 | BUG_ON(1); |
5018 | } | |
727011e0 | 5019 | if (dst_offset < src_offset) { |
d1310b2e CM |
5020 | memcpy_extent_buffer(dst, dst_offset, src_offset, len); |
5021 | return; | |
5022 | } | |
d397712b | 5023 | while (len > 0) { |
d1310b2e CM |
5024 | dst_i = (start_offset + dst_end) >> PAGE_CACHE_SHIFT; |
5025 | src_i = (start_offset + src_end) >> PAGE_CACHE_SHIFT; | |
5026 | ||
5027 | dst_off_in_page = (start_offset + dst_end) & | |
5028 | ((unsigned long)PAGE_CACHE_SIZE - 1); | |
5029 | src_off_in_page = (start_offset + src_end) & | |
5030 | ((unsigned long)PAGE_CACHE_SIZE - 1); | |
5031 | ||
5032 | cur = min_t(unsigned long, len, src_off_in_page + 1); | |
5033 | cur = min(cur, dst_off_in_page + 1); | |
5034 | move_pages(extent_buffer_page(dst, dst_i), | |
5035 | extent_buffer_page(dst, src_i), | |
5036 | dst_off_in_page - cur + 1, | |
5037 | src_off_in_page - cur + 1, cur); | |
5038 | ||
5039 | dst_end -= cur; | |
5040 | src_end -= cur; | |
5041 | len -= cur; | |
5042 | } | |
5043 | } | |
6af118ce | 5044 | |
f7a52a40 | 5045 | int try_release_extent_buffer(struct page *page) |
19fe0a8b | 5046 | { |
6af118ce | 5047 | struct extent_buffer *eb; |
6af118ce | 5048 | |
3083ee2e JB |
5049 | /* |
5050 | * We need to make sure noboody is attaching this page to an eb right | |
5051 | * now. | |
5052 | */ | |
5053 | spin_lock(&page->mapping->private_lock); | |
5054 | if (!PagePrivate(page)) { | |
5055 | spin_unlock(&page->mapping->private_lock); | |
4f2de97a | 5056 | return 1; |
45f49bce | 5057 | } |
6af118ce | 5058 | |
3083ee2e JB |
5059 | eb = (struct extent_buffer *)page->private; |
5060 | BUG_ON(!eb); | |
19fe0a8b MX |
5061 | |
5062 | /* | |
3083ee2e JB |
5063 | * This is a little awful but should be ok, we need to make sure that |
5064 | * the eb doesn't disappear out from under us while we're looking at | |
5065 | * this page. | |
19fe0a8b | 5066 | */ |
3083ee2e | 5067 | spin_lock(&eb->refs_lock); |
0b32f4bb | 5068 | if (atomic_read(&eb->refs) != 1 || extent_buffer_under_io(eb)) { |
3083ee2e JB |
5069 | spin_unlock(&eb->refs_lock); |
5070 | spin_unlock(&page->mapping->private_lock); | |
5071 | return 0; | |
b9473439 | 5072 | } |
3083ee2e | 5073 | spin_unlock(&page->mapping->private_lock); |
897ca6e9 | 5074 | |
19fe0a8b | 5075 | /* |
3083ee2e JB |
5076 | * If tree ref isn't set then we know the ref on this eb is a real ref, |
5077 | * so just return, this page will likely be freed soon anyway. | |
19fe0a8b | 5078 | */ |
3083ee2e JB |
5079 | if (!test_and_clear_bit(EXTENT_BUFFER_TREE_REF, &eb->bflags)) { |
5080 | spin_unlock(&eb->refs_lock); | |
5081 | return 0; | |
b9473439 | 5082 | } |
19fe0a8b | 5083 | |
f7a52a40 | 5084 | return release_extent_buffer(eb); |
6af118ce | 5085 | } |