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" |
fe09e16c | 23 | #include "backref.h" |
d1310b2e | 24 | |
d1310b2e CM |
25 | static struct kmem_cache *extent_state_cache; |
26 | static struct kmem_cache *extent_buffer_cache; | |
9be3395b | 27 | static struct bio_set *btrfs_bioset; |
d1310b2e | 28 | |
6d49ba1b | 29 | #ifdef CONFIG_BTRFS_DEBUG |
d1310b2e CM |
30 | static LIST_HEAD(buffers); |
31 | static LIST_HEAD(states); | |
4bef0848 | 32 | |
d397712b | 33 | static DEFINE_SPINLOCK(leak_lock); |
6d49ba1b ES |
34 | |
35 | static inline | |
36 | void btrfs_leak_debug_add(struct list_head *new, struct list_head *head) | |
37 | { | |
38 | unsigned long flags; | |
39 | ||
40 | spin_lock_irqsave(&leak_lock, flags); | |
41 | list_add(new, head); | |
42 | spin_unlock_irqrestore(&leak_lock, flags); | |
43 | } | |
44 | ||
45 | static inline | |
46 | void btrfs_leak_debug_del(struct list_head *entry) | |
47 | { | |
48 | unsigned long flags; | |
49 | ||
50 | spin_lock_irqsave(&leak_lock, flags); | |
51 | list_del(entry); | |
52 | spin_unlock_irqrestore(&leak_lock, flags); | |
53 | } | |
54 | ||
55 | static inline | |
56 | void btrfs_leak_debug_check(void) | |
57 | { | |
58 | struct extent_state *state; | |
59 | struct extent_buffer *eb; | |
60 | ||
61 | while (!list_empty(&states)) { | |
62 | state = list_entry(states.next, struct extent_state, leak_list); | |
63 | printk(KERN_ERR "btrfs state leak: start %llu end %llu " | |
64 | "state %lu in tree %p refs %d\n", | |
c1c9ff7c GU |
65 | state->start, state->end, state->state, state->tree, |
66 | atomic_read(&state->refs)); | |
6d49ba1b ES |
67 | list_del(&state->leak_list); |
68 | kmem_cache_free(extent_state_cache, state); | |
69 | } | |
70 | ||
71 | while (!list_empty(&buffers)) { | |
72 | eb = list_entry(buffers.next, struct extent_buffer, leak_list); | |
73 | printk(KERN_ERR "btrfs buffer leak start %llu len %lu " | |
c1c9ff7c GU |
74 | "refs %d\n", |
75 | eb->start, eb->len, atomic_read(&eb->refs)); | |
6d49ba1b ES |
76 | list_del(&eb->leak_list); |
77 | kmem_cache_free(extent_buffer_cache, eb); | |
78 | } | |
79 | } | |
8d599ae1 DS |
80 | |
81 | #define btrfs_debug_check_extent_io_range(inode, start, end) \ | |
82 | __btrfs_debug_check_extent_io_range(__func__, (inode), (start), (end)) | |
83 | static inline void __btrfs_debug_check_extent_io_range(const char *caller, | |
84 | struct inode *inode, u64 start, u64 end) | |
85 | { | |
86 | u64 isize = i_size_read(inode); | |
87 | ||
88 | if (end >= PAGE_SIZE && (end % 2) == 0 && end != isize - 1) { | |
89 | printk_ratelimited(KERN_DEBUG | |
90 | "btrfs: %s: ino %llu isize %llu odd range [%llu,%llu]\n", | |
c1c9ff7c | 91 | caller, btrfs_ino(inode), isize, start, end); |
8d599ae1 DS |
92 | } |
93 | } | |
6d49ba1b ES |
94 | #else |
95 | #define btrfs_leak_debug_add(new, head) do {} while (0) | |
96 | #define btrfs_leak_debug_del(entry) do {} while (0) | |
97 | #define btrfs_leak_debug_check() do {} while (0) | |
8d599ae1 | 98 | #define btrfs_debug_check_extent_io_range(c, s, e) do {} while (0) |
4bef0848 | 99 | #endif |
d1310b2e | 100 | |
d1310b2e CM |
101 | #define BUFFER_LRU_MAX 64 |
102 | ||
103 | struct tree_entry { | |
104 | u64 start; | |
105 | u64 end; | |
d1310b2e CM |
106 | struct rb_node rb_node; |
107 | }; | |
108 | ||
109 | struct extent_page_data { | |
110 | struct bio *bio; | |
111 | struct extent_io_tree *tree; | |
112 | get_extent_t *get_extent; | |
de0022b9 | 113 | unsigned long bio_flags; |
771ed689 CM |
114 | |
115 | /* tells writepage not to lock the state bits for this range | |
116 | * it still does the unlocking | |
117 | */ | |
ffbd517d CM |
118 | unsigned int extent_locked:1; |
119 | ||
120 | /* tells the submit_bio code to use a WRITE_SYNC */ | |
121 | unsigned int sync_io:1; | |
d1310b2e CM |
122 | }; |
123 | ||
0b32f4bb | 124 | static noinline void flush_write_bio(void *data); |
c2d904e0 JM |
125 | static inline struct btrfs_fs_info * |
126 | tree_fs_info(struct extent_io_tree *tree) | |
127 | { | |
128 | return btrfs_sb(tree->mapping->host->i_sb); | |
129 | } | |
0b32f4bb | 130 | |
d1310b2e CM |
131 | int __init extent_io_init(void) |
132 | { | |
837e1972 | 133 | extent_state_cache = kmem_cache_create("btrfs_extent_state", |
9601e3f6 CH |
134 | sizeof(struct extent_state), 0, |
135 | SLAB_RECLAIM_ACCOUNT | SLAB_MEM_SPREAD, NULL); | |
d1310b2e CM |
136 | if (!extent_state_cache) |
137 | return -ENOMEM; | |
138 | ||
837e1972 | 139 | extent_buffer_cache = kmem_cache_create("btrfs_extent_buffer", |
9601e3f6 CH |
140 | sizeof(struct extent_buffer), 0, |
141 | SLAB_RECLAIM_ACCOUNT | SLAB_MEM_SPREAD, NULL); | |
d1310b2e CM |
142 | if (!extent_buffer_cache) |
143 | goto free_state_cache; | |
9be3395b CM |
144 | |
145 | btrfs_bioset = bioset_create(BIO_POOL_SIZE, | |
146 | offsetof(struct btrfs_io_bio, bio)); | |
147 | if (!btrfs_bioset) | |
148 | goto free_buffer_cache; | |
b208c2f7 DW |
149 | |
150 | if (bioset_integrity_create(btrfs_bioset, BIO_POOL_SIZE)) | |
151 | goto free_bioset; | |
152 | ||
d1310b2e CM |
153 | return 0; |
154 | ||
b208c2f7 DW |
155 | free_bioset: |
156 | bioset_free(btrfs_bioset); | |
157 | btrfs_bioset = NULL; | |
158 | ||
9be3395b CM |
159 | free_buffer_cache: |
160 | kmem_cache_destroy(extent_buffer_cache); | |
161 | extent_buffer_cache = NULL; | |
162 | ||
d1310b2e CM |
163 | free_state_cache: |
164 | kmem_cache_destroy(extent_state_cache); | |
9be3395b | 165 | extent_state_cache = NULL; |
d1310b2e CM |
166 | return -ENOMEM; |
167 | } | |
168 | ||
169 | void extent_io_exit(void) | |
170 | { | |
6d49ba1b | 171 | btrfs_leak_debug_check(); |
8c0a8537 KS |
172 | |
173 | /* | |
174 | * Make sure all delayed rcu free are flushed before we | |
175 | * destroy caches. | |
176 | */ | |
177 | rcu_barrier(); | |
d1310b2e CM |
178 | if (extent_state_cache) |
179 | kmem_cache_destroy(extent_state_cache); | |
180 | if (extent_buffer_cache) | |
181 | kmem_cache_destroy(extent_buffer_cache); | |
9be3395b CM |
182 | if (btrfs_bioset) |
183 | bioset_free(btrfs_bioset); | |
d1310b2e CM |
184 | } |
185 | ||
186 | void extent_io_tree_init(struct extent_io_tree *tree, | |
f993c883 | 187 | struct address_space *mapping) |
d1310b2e | 188 | { |
6bef4d31 | 189 | tree->state = RB_ROOT; |
19fe0a8b | 190 | INIT_RADIX_TREE(&tree->buffer, GFP_ATOMIC); |
d1310b2e CM |
191 | tree->ops = NULL; |
192 | tree->dirty_bytes = 0; | |
70dec807 | 193 | spin_lock_init(&tree->lock); |
6af118ce | 194 | spin_lock_init(&tree->buffer_lock); |
d1310b2e | 195 | tree->mapping = mapping; |
d1310b2e | 196 | } |
d1310b2e | 197 | |
b2950863 | 198 | static struct extent_state *alloc_extent_state(gfp_t mask) |
d1310b2e CM |
199 | { |
200 | struct extent_state *state; | |
d1310b2e CM |
201 | |
202 | state = kmem_cache_alloc(extent_state_cache, mask); | |
2b114d1d | 203 | if (!state) |
d1310b2e CM |
204 | return state; |
205 | state->state = 0; | |
d1310b2e | 206 | state->private = 0; |
70dec807 | 207 | state->tree = NULL; |
6d49ba1b | 208 | btrfs_leak_debug_add(&state->leak_list, &states); |
d1310b2e CM |
209 | atomic_set(&state->refs, 1); |
210 | init_waitqueue_head(&state->wq); | |
143bede5 | 211 | trace_alloc_extent_state(state, mask, _RET_IP_); |
d1310b2e CM |
212 | return state; |
213 | } | |
d1310b2e | 214 | |
4845e44f | 215 | void free_extent_state(struct extent_state *state) |
d1310b2e | 216 | { |
d1310b2e CM |
217 | if (!state) |
218 | return; | |
219 | if (atomic_dec_and_test(&state->refs)) { | |
70dec807 | 220 | WARN_ON(state->tree); |
6d49ba1b | 221 | btrfs_leak_debug_del(&state->leak_list); |
143bede5 | 222 | trace_free_extent_state(state, _RET_IP_); |
d1310b2e CM |
223 | kmem_cache_free(extent_state_cache, state); |
224 | } | |
225 | } | |
d1310b2e CM |
226 | |
227 | static struct rb_node *tree_insert(struct rb_root *root, u64 offset, | |
228 | struct rb_node *node) | |
229 | { | |
d397712b CM |
230 | struct rb_node **p = &root->rb_node; |
231 | struct rb_node *parent = NULL; | |
d1310b2e CM |
232 | struct tree_entry *entry; |
233 | ||
d397712b | 234 | while (*p) { |
d1310b2e CM |
235 | parent = *p; |
236 | entry = rb_entry(parent, struct tree_entry, rb_node); | |
237 | ||
238 | if (offset < entry->start) | |
239 | p = &(*p)->rb_left; | |
240 | else if (offset > entry->end) | |
241 | p = &(*p)->rb_right; | |
242 | else | |
243 | return parent; | |
244 | } | |
245 | ||
d1310b2e CM |
246 | rb_link_node(node, parent, p); |
247 | rb_insert_color(node, root); | |
248 | return NULL; | |
249 | } | |
250 | ||
80ea96b1 | 251 | static struct rb_node *__etree_search(struct extent_io_tree *tree, u64 offset, |
d1310b2e CM |
252 | struct rb_node **prev_ret, |
253 | struct rb_node **next_ret) | |
254 | { | |
80ea96b1 | 255 | struct rb_root *root = &tree->state; |
d397712b | 256 | struct rb_node *n = root->rb_node; |
d1310b2e CM |
257 | struct rb_node *prev = NULL; |
258 | struct rb_node *orig_prev = NULL; | |
259 | struct tree_entry *entry; | |
260 | struct tree_entry *prev_entry = NULL; | |
261 | ||
d397712b | 262 | while (n) { |
d1310b2e CM |
263 | entry = rb_entry(n, struct tree_entry, rb_node); |
264 | prev = n; | |
265 | prev_entry = entry; | |
266 | ||
267 | if (offset < entry->start) | |
268 | n = n->rb_left; | |
269 | else if (offset > entry->end) | |
270 | n = n->rb_right; | |
d397712b | 271 | else |
d1310b2e CM |
272 | return n; |
273 | } | |
274 | ||
275 | if (prev_ret) { | |
276 | orig_prev = prev; | |
d397712b | 277 | while (prev && offset > prev_entry->end) { |
d1310b2e CM |
278 | prev = rb_next(prev); |
279 | prev_entry = rb_entry(prev, struct tree_entry, rb_node); | |
280 | } | |
281 | *prev_ret = prev; | |
282 | prev = orig_prev; | |
283 | } | |
284 | ||
285 | if (next_ret) { | |
286 | prev_entry = rb_entry(prev, struct tree_entry, rb_node); | |
d397712b | 287 | while (prev && offset < prev_entry->start) { |
d1310b2e CM |
288 | prev = rb_prev(prev); |
289 | prev_entry = rb_entry(prev, struct tree_entry, rb_node); | |
290 | } | |
291 | *next_ret = prev; | |
292 | } | |
293 | return NULL; | |
294 | } | |
295 | ||
80ea96b1 CM |
296 | static inline struct rb_node *tree_search(struct extent_io_tree *tree, |
297 | u64 offset) | |
d1310b2e | 298 | { |
70dec807 | 299 | struct rb_node *prev = NULL; |
d1310b2e | 300 | struct rb_node *ret; |
70dec807 | 301 | |
80ea96b1 | 302 | ret = __etree_search(tree, offset, &prev, NULL); |
d397712b | 303 | if (!ret) |
d1310b2e CM |
304 | return prev; |
305 | return ret; | |
306 | } | |
307 | ||
9ed74f2d JB |
308 | static void merge_cb(struct extent_io_tree *tree, struct extent_state *new, |
309 | struct extent_state *other) | |
310 | { | |
311 | if (tree->ops && tree->ops->merge_extent_hook) | |
312 | tree->ops->merge_extent_hook(tree->mapping->host, new, | |
313 | other); | |
314 | } | |
315 | ||
d1310b2e CM |
316 | /* |
317 | * utility function to look for merge candidates inside a given range. | |
318 | * Any extents with matching state are merged together into a single | |
319 | * extent in the tree. Extents with EXTENT_IO in their state field | |
320 | * are not merged because the end_io handlers need to be able to do | |
321 | * operations on them without sleeping (or doing allocations/splits). | |
322 | * | |
323 | * This should be called with the tree lock held. | |
324 | */ | |
1bf85046 JM |
325 | static void merge_state(struct extent_io_tree *tree, |
326 | struct extent_state *state) | |
d1310b2e CM |
327 | { |
328 | struct extent_state *other; | |
329 | struct rb_node *other_node; | |
330 | ||
5b21f2ed | 331 | if (state->state & (EXTENT_IOBITS | EXTENT_BOUNDARY)) |
1bf85046 | 332 | return; |
d1310b2e CM |
333 | |
334 | other_node = rb_prev(&state->rb_node); | |
335 | if (other_node) { | |
336 | other = rb_entry(other_node, struct extent_state, rb_node); | |
337 | if (other->end == state->start - 1 && | |
338 | other->state == state->state) { | |
9ed74f2d | 339 | merge_cb(tree, state, other); |
d1310b2e | 340 | state->start = other->start; |
70dec807 | 341 | other->tree = NULL; |
d1310b2e CM |
342 | rb_erase(&other->rb_node, &tree->state); |
343 | free_extent_state(other); | |
344 | } | |
345 | } | |
346 | other_node = rb_next(&state->rb_node); | |
347 | if (other_node) { | |
348 | other = rb_entry(other_node, struct extent_state, rb_node); | |
349 | if (other->start == state->end + 1 && | |
350 | other->state == state->state) { | |
9ed74f2d | 351 | merge_cb(tree, state, other); |
df98b6e2 JB |
352 | state->end = other->end; |
353 | other->tree = NULL; | |
354 | rb_erase(&other->rb_node, &tree->state); | |
355 | free_extent_state(other); | |
d1310b2e CM |
356 | } |
357 | } | |
d1310b2e CM |
358 | } |
359 | ||
1bf85046 | 360 | static void set_state_cb(struct extent_io_tree *tree, |
41074888 | 361 | struct extent_state *state, unsigned long *bits) |
291d673e | 362 | { |
1bf85046 JM |
363 | if (tree->ops && tree->ops->set_bit_hook) |
364 | tree->ops->set_bit_hook(tree->mapping->host, state, bits); | |
291d673e CM |
365 | } |
366 | ||
367 | static void clear_state_cb(struct extent_io_tree *tree, | |
41074888 | 368 | struct extent_state *state, unsigned long *bits) |
291d673e | 369 | { |
9ed74f2d JB |
370 | if (tree->ops && tree->ops->clear_bit_hook) |
371 | tree->ops->clear_bit_hook(tree->mapping->host, state, bits); | |
291d673e CM |
372 | } |
373 | ||
3150b699 | 374 | static void set_state_bits(struct extent_io_tree *tree, |
41074888 | 375 | struct extent_state *state, unsigned long *bits); |
3150b699 | 376 | |
d1310b2e CM |
377 | /* |
378 | * insert an extent_state struct into the tree. 'bits' are set on the | |
379 | * struct before it is inserted. | |
380 | * | |
381 | * This may return -EEXIST if the extent is already there, in which case the | |
382 | * state struct is freed. | |
383 | * | |
384 | * The tree lock is not taken internally. This is a utility function and | |
385 | * probably isn't what you want to call (see set/clear_extent_bit). | |
386 | */ | |
387 | static int insert_state(struct extent_io_tree *tree, | |
388 | struct extent_state *state, u64 start, u64 end, | |
41074888 | 389 | unsigned long *bits) |
d1310b2e CM |
390 | { |
391 | struct rb_node *node; | |
392 | ||
31b1a2bd JL |
393 | if (end < start) |
394 | WARN(1, KERN_ERR "btrfs end < start %llu %llu\n", | |
c1c9ff7c | 395 | end, start); |
d1310b2e CM |
396 | state->start = start; |
397 | state->end = end; | |
9ed74f2d | 398 | |
3150b699 XG |
399 | set_state_bits(tree, state, bits); |
400 | ||
d1310b2e CM |
401 | node = tree_insert(&tree->state, end, &state->rb_node); |
402 | if (node) { | |
403 | struct extent_state *found; | |
404 | found = rb_entry(node, struct extent_state, rb_node); | |
d397712b | 405 | printk(KERN_ERR "btrfs found node %llu %llu on insert of " |
c1c9ff7c GU |
406 | "%llu %llu\n", |
407 | found->start, found->end, start, end); | |
d1310b2e CM |
408 | return -EEXIST; |
409 | } | |
70dec807 | 410 | state->tree = tree; |
d1310b2e CM |
411 | merge_state(tree, state); |
412 | return 0; | |
413 | } | |
414 | ||
1bf85046 | 415 | static void split_cb(struct extent_io_tree *tree, struct extent_state *orig, |
9ed74f2d JB |
416 | u64 split) |
417 | { | |
418 | if (tree->ops && tree->ops->split_extent_hook) | |
1bf85046 | 419 | tree->ops->split_extent_hook(tree->mapping->host, orig, split); |
9ed74f2d JB |
420 | } |
421 | ||
d1310b2e CM |
422 | /* |
423 | * split a given extent state struct in two, inserting the preallocated | |
424 | * struct 'prealloc' as the newly created second half. 'split' indicates an | |
425 | * offset inside 'orig' where it should be split. | |
426 | * | |
427 | * Before calling, | |
428 | * the tree has 'orig' at [orig->start, orig->end]. After calling, there | |
429 | * are two extent state structs in the tree: | |
430 | * prealloc: [orig->start, split - 1] | |
431 | * orig: [ split, orig->end ] | |
432 | * | |
433 | * The tree locks are not taken by this function. They need to be held | |
434 | * by the caller. | |
435 | */ | |
436 | static int split_state(struct extent_io_tree *tree, struct extent_state *orig, | |
437 | struct extent_state *prealloc, u64 split) | |
438 | { | |
439 | struct rb_node *node; | |
9ed74f2d JB |
440 | |
441 | split_cb(tree, orig, split); | |
442 | ||
d1310b2e CM |
443 | prealloc->start = orig->start; |
444 | prealloc->end = split - 1; | |
445 | prealloc->state = orig->state; | |
446 | orig->start = split; | |
447 | ||
448 | node = tree_insert(&tree->state, prealloc->end, &prealloc->rb_node); | |
449 | if (node) { | |
d1310b2e CM |
450 | free_extent_state(prealloc); |
451 | return -EEXIST; | |
452 | } | |
70dec807 | 453 | prealloc->tree = tree; |
d1310b2e CM |
454 | return 0; |
455 | } | |
456 | ||
cdc6a395 LZ |
457 | static struct extent_state *next_state(struct extent_state *state) |
458 | { | |
459 | struct rb_node *next = rb_next(&state->rb_node); | |
460 | if (next) | |
461 | return rb_entry(next, struct extent_state, rb_node); | |
462 | else | |
463 | return NULL; | |
464 | } | |
465 | ||
d1310b2e CM |
466 | /* |
467 | * utility function to clear some bits in an extent state struct. | |
1b303fc0 | 468 | * it will optionally wake up any one waiting on this state (wake == 1). |
d1310b2e CM |
469 | * |
470 | * If no bits are set on the state struct after clearing things, the | |
471 | * struct is freed and removed from the tree | |
472 | */ | |
cdc6a395 LZ |
473 | static struct extent_state *clear_state_bit(struct extent_io_tree *tree, |
474 | struct extent_state *state, | |
41074888 | 475 | unsigned long *bits, int wake) |
d1310b2e | 476 | { |
cdc6a395 | 477 | struct extent_state *next; |
41074888 | 478 | unsigned long bits_to_clear = *bits & ~EXTENT_CTLBITS; |
d1310b2e | 479 | |
0ca1f7ce | 480 | if ((bits_to_clear & EXTENT_DIRTY) && (state->state & EXTENT_DIRTY)) { |
d1310b2e CM |
481 | u64 range = state->end - state->start + 1; |
482 | WARN_ON(range > tree->dirty_bytes); | |
483 | tree->dirty_bytes -= range; | |
484 | } | |
291d673e | 485 | clear_state_cb(tree, state, bits); |
32c00aff | 486 | state->state &= ~bits_to_clear; |
d1310b2e CM |
487 | if (wake) |
488 | wake_up(&state->wq); | |
0ca1f7ce | 489 | if (state->state == 0) { |
cdc6a395 | 490 | next = next_state(state); |
70dec807 | 491 | if (state->tree) { |
d1310b2e | 492 | rb_erase(&state->rb_node, &tree->state); |
70dec807 | 493 | state->tree = NULL; |
d1310b2e CM |
494 | free_extent_state(state); |
495 | } else { | |
496 | WARN_ON(1); | |
497 | } | |
498 | } else { | |
499 | merge_state(tree, state); | |
cdc6a395 | 500 | next = next_state(state); |
d1310b2e | 501 | } |
cdc6a395 | 502 | return next; |
d1310b2e CM |
503 | } |
504 | ||
8233767a XG |
505 | static struct extent_state * |
506 | alloc_extent_state_atomic(struct extent_state *prealloc) | |
507 | { | |
508 | if (!prealloc) | |
509 | prealloc = alloc_extent_state(GFP_ATOMIC); | |
510 | ||
511 | return prealloc; | |
512 | } | |
513 | ||
48a3b636 | 514 | static void extent_io_tree_panic(struct extent_io_tree *tree, int err) |
c2d904e0 JM |
515 | { |
516 | btrfs_panic(tree_fs_info(tree), err, "Locking error: " | |
517 | "Extent tree was modified by another " | |
518 | "thread while locked."); | |
519 | } | |
520 | ||
d1310b2e CM |
521 | /* |
522 | * clear some bits on a range in the tree. This may require splitting | |
523 | * or inserting elements in the tree, so the gfp mask is used to | |
524 | * indicate which allocations or sleeping are allowed. | |
525 | * | |
526 | * pass 'wake' == 1 to kick any sleepers, and 'delete' == 1 to remove | |
527 | * the given range from the tree regardless of state (ie for truncate). | |
528 | * | |
529 | * the range [start, end] is inclusive. | |
530 | * | |
6763af84 | 531 | * This takes the tree lock, and returns 0 on success and < 0 on error. |
d1310b2e CM |
532 | */ |
533 | int clear_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, | |
41074888 | 534 | unsigned long bits, int wake, int delete, |
2c64c53d CM |
535 | struct extent_state **cached_state, |
536 | gfp_t mask) | |
d1310b2e CM |
537 | { |
538 | struct extent_state *state; | |
2c64c53d | 539 | struct extent_state *cached; |
d1310b2e CM |
540 | struct extent_state *prealloc = NULL; |
541 | struct rb_node *node; | |
5c939df5 | 542 | u64 last_end; |
d1310b2e | 543 | int err; |
2ac55d41 | 544 | int clear = 0; |
d1310b2e | 545 | |
8d599ae1 DS |
546 | btrfs_debug_check_extent_io_range(tree->mapping->host, start, end); |
547 | ||
7ee9e440 JB |
548 | if (bits & EXTENT_DELALLOC) |
549 | bits |= EXTENT_NORESERVE; | |
550 | ||
0ca1f7ce YZ |
551 | if (delete) |
552 | bits |= ~EXTENT_CTLBITS; | |
553 | bits |= EXTENT_FIRST_DELALLOC; | |
554 | ||
2ac55d41 JB |
555 | if (bits & (EXTENT_IOBITS | EXTENT_BOUNDARY)) |
556 | clear = 1; | |
d1310b2e CM |
557 | again: |
558 | if (!prealloc && (mask & __GFP_WAIT)) { | |
559 | prealloc = alloc_extent_state(mask); | |
560 | if (!prealloc) | |
561 | return -ENOMEM; | |
562 | } | |
563 | ||
cad321ad | 564 | spin_lock(&tree->lock); |
2c64c53d CM |
565 | if (cached_state) { |
566 | cached = *cached_state; | |
2ac55d41 JB |
567 | |
568 | if (clear) { | |
569 | *cached_state = NULL; | |
570 | cached_state = NULL; | |
571 | } | |
572 | ||
df98b6e2 JB |
573 | if (cached && cached->tree && cached->start <= start && |
574 | cached->end > start) { | |
2ac55d41 JB |
575 | if (clear) |
576 | atomic_dec(&cached->refs); | |
2c64c53d | 577 | state = cached; |
42daec29 | 578 | goto hit_next; |
2c64c53d | 579 | } |
2ac55d41 JB |
580 | if (clear) |
581 | free_extent_state(cached); | |
2c64c53d | 582 | } |
d1310b2e CM |
583 | /* |
584 | * this search will find the extents that end after | |
585 | * our range starts | |
586 | */ | |
80ea96b1 | 587 | node = tree_search(tree, start); |
d1310b2e CM |
588 | if (!node) |
589 | goto out; | |
590 | state = rb_entry(node, struct extent_state, rb_node); | |
2c64c53d | 591 | hit_next: |
d1310b2e CM |
592 | if (state->start > end) |
593 | goto out; | |
594 | WARN_ON(state->end < start); | |
5c939df5 | 595 | last_end = state->end; |
d1310b2e | 596 | |
0449314a | 597 | /* the state doesn't have the wanted bits, go ahead */ |
cdc6a395 LZ |
598 | if (!(state->state & bits)) { |
599 | state = next_state(state); | |
0449314a | 600 | goto next; |
cdc6a395 | 601 | } |
0449314a | 602 | |
d1310b2e CM |
603 | /* |
604 | * | ---- desired range ---- | | |
605 | * | state | or | |
606 | * | ------------- state -------------- | | |
607 | * | |
608 | * We need to split the extent we found, and may flip | |
609 | * bits on second half. | |
610 | * | |
611 | * If the extent we found extends past our range, we | |
612 | * just split and search again. It'll get split again | |
613 | * the next time though. | |
614 | * | |
615 | * If the extent we found is inside our range, we clear | |
616 | * the desired bit on it. | |
617 | */ | |
618 | ||
619 | if (state->start < start) { | |
8233767a XG |
620 | prealloc = alloc_extent_state_atomic(prealloc); |
621 | BUG_ON(!prealloc); | |
d1310b2e | 622 | err = split_state(tree, state, prealloc, start); |
c2d904e0 JM |
623 | if (err) |
624 | extent_io_tree_panic(tree, err); | |
625 | ||
d1310b2e CM |
626 | prealloc = NULL; |
627 | if (err) | |
628 | goto out; | |
629 | if (state->end <= end) { | |
d1ac6e41 LB |
630 | state = clear_state_bit(tree, state, &bits, wake); |
631 | goto next; | |
d1310b2e CM |
632 | } |
633 | goto search_again; | |
634 | } | |
635 | /* | |
636 | * | ---- desired range ---- | | |
637 | * | state | | |
638 | * We need to split the extent, and clear the bit | |
639 | * on the first half | |
640 | */ | |
641 | if (state->start <= end && state->end > end) { | |
8233767a XG |
642 | prealloc = alloc_extent_state_atomic(prealloc); |
643 | BUG_ON(!prealloc); | |
d1310b2e | 644 | err = split_state(tree, state, prealloc, end + 1); |
c2d904e0 JM |
645 | if (err) |
646 | extent_io_tree_panic(tree, err); | |
647 | ||
d1310b2e CM |
648 | if (wake) |
649 | wake_up(&state->wq); | |
42daec29 | 650 | |
6763af84 | 651 | clear_state_bit(tree, prealloc, &bits, wake); |
9ed74f2d | 652 | |
d1310b2e CM |
653 | prealloc = NULL; |
654 | goto out; | |
655 | } | |
42daec29 | 656 | |
cdc6a395 | 657 | state = clear_state_bit(tree, state, &bits, wake); |
0449314a | 658 | next: |
5c939df5 YZ |
659 | if (last_end == (u64)-1) |
660 | goto out; | |
661 | start = last_end + 1; | |
cdc6a395 | 662 | if (start <= end && state && !need_resched()) |
692e5759 | 663 | goto hit_next; |
d1310b2e CM |
664 | goto search_again; |
665 | ||
666 | out: | |
cad321ad | 667 | spin_unlock(&tree->lock); |
d1310b2e CM |
668 | if (prealloc) |
669 | free_extent_state(prealloc); | |
670 | ||
6763af84 | 671 | return 0; |
d1310b2e CM |
672 | |
673 | search_again: | |
674 | if (start > end) | |
675 | goto out; | |
cad321ad | 676 | spin_unlock(&tree->lock); |
d1310b2e CM |
677 | if (mask & __GFP_WAIT) |
678 | cond_resched(); | |
679 | goto again; | |
680 | } | |
d1310b2e | 681 | |
143bede5 JM |
682 | static void wait_on_state(struct extent_io_tree *tree, |
683 | struct extent_state *state) | |
641f5219 CH |
684 | __releases(tree->lock) |
685 | __acquires(tree->lock) | |
d1310b2e CM |
686 | { |
687 | DEFINE_WAIT(wait); | |
688 | prepare_to_wait(&state->wq, &wait, TASK_UNINTERRUPTIBLE); | |
cad321ad | 689 | spin_unlock(&tree->lock); |
d1310b2e | 690 | schedule(); |
cad321ad | 691 | spin_lock(&tree->lock); |
d1310b2e | 692 | finish_wait(&state->wq, &wait); |
d1310b2e CM |
693 | } |
694 | ||
695 | /* | |
696 | * waits for one or more bits to clear on a range in the state tree. | |
697 | * The range [start, end] is inclusive. | |
698 | * The tree lock is taken by this function | |
699 | */ | |
41074888 DS |
700 | static void wait_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, |
701 | unsigned long bits) | |
d1310b2e CM |
702 | { |
703 | struct extent_state *state; | |
704 | struct rb_node *node; | |
705 | ||
8d599ae1 DS |
706 | btrfs_debug_check_extent_io_range(tree->mapping->host, start, end); |
707 | ||
cad321ad | 708 | spin_lock(&tree->lock); |
d1310b2e CM |
709 | again: |
710 | while (1) { | |
711 | /* | |
712 | * this search will find all the extents that end after | |
713 | * our range starts | |
714 | */ | |
80ea96b1 | 715 | node = tree_search(tree, start); |
d1310b2e CM |
716 | if (!node) |
717 | break; | |
718 | ||
719 | state = rb_entry(node, struct extent_state, rb_node); | |
720 | ||
721 | if (state->start > end) | |
722 | goto out; | |
723 | ||
724 | if (state->state & bits) { | |
725 | start = state->start; | |
726 | atomic_inc(&state->refs); | |
727 | wait_on_state(tree, state); | |
728 | free_extent_state(state); | |
729 | goto again; | |
730 | } | |
731 | start = state->end + 1; | |
732 | ||
733 | if (start > end) | |
734 | break; | |
735 | ||
ded91f08 | 736 | cond_resched_lock(&tree->lock); |
d1310b2e CM |
737 | } |
738 | out: | |
cad321ad | 739 | spin_unlock(&tree->lock); |
d1310b2e | 740 | } |
d1310b2e | 741 | |
1bf85046 | 742 | static void set_state_bits(struct extent_io_tree *tree, |
d1310b2e | 743 | struct extent_state *state, |
41074888 | 744 | unsigned long *bits) |
d1310b2e | 745 | { |
41074888 | 746 | unsigned long bits_to_set = *bits & ~EXTENT_CTLBITS; |
9ed74f2d | 747 | |
1bf85046 | 748 | set_state_cb(tree, state, bits); |
0ca1f7ce | 749 | if ((bits_to_set & EXTENT_DIRTY) && !(state->state & EXTENT_DIRTY)) { |
d1310b2e CM |
750 | u64 range = state->end - state->start + 1; |
751 | tree->dirty_bytes += range; | |
752 | } | |
0ca1f7ce | 753 | state->state |= bits_to_set; |
d1310b2e CM |
754 | } |
755 | ||
2c64c53d CM |
756 | static void cache_state(struct extent_state *state, |
757 | struct extent_state **cached_ptr) | |
758 | { | |
759 | if (cached_ptr && !(*cached_ptr)) { | |
760 | if (state->state & (EXTENT_IOBITS | EXTENT_BOUNDARY)) { | |
761 | *cached_ptr = state; | |
762 | atomic_inc(&state->refs); | |
763 | } | |
764 | } | |
765 | } | |
766 | ||
d1310b2e | 767 | /* |
1edbb734 CM |
768 | * set some bits on a range in the tree. This may require allocations or |
769 | * sleeping, so the gfp mask is used to indicate what is allowed. | |
d1310b2e | 770 | * |
1edbb734 CM |
771 | * If any of the exclusive bits are set, this will fail with -EEXIST if some |
772 | * part of the range already has the desired bits set. The start of the | |
773 | * existing range is returned in failed_start in this case. | |
d1310b2e | 774 | * |
1edbb734 | 775 | * [start, end] is inclusive This takes the tree lock. |
d1310b2e | 776 | */ |
1edbb734 | 777 | |
3fbe5c02 JM |
778 | static int __must_check |
779 | __set_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, | |
41074888 DS |
780 | unsigned long bits, unsigned long exclusive_bits, |
781 | u64 *failed_start, struct extent_state **cached_state, | |
782 | gfp_t mask) | |
d1310b2e CM |
783 | { |
784 | struct extent_state *state; | |
785 | struct extent_state *prealloc = NULL; | |
786 | struct rb_node *node; | |
d1310b2e | 787 | int err = 0; |
d1310b2e CM |
788 | u64 last_start; |
789 | u64 last_end; | |
42daec29 | 790 | |
8d599ae1 DS |
791 | btrfs_debug_check_extent_io_range(tree->mapping->host, start, end); |
792 | ||
0ca1f7ce | 793 | bits |= EXTENT_FIRST_DELALLOC; |
d1310b2e CM |
794 | again: |
795 | if (!prealloc && (mask & __GFP_WAIT)) { | |
796 | prealloc = alloc_extent_state(mask); | |
8233767a | 797 | BUG_ON(!prealloc); |
d1310b2e CM |
798 | } |
799 | ||
cad321ad | 800 | spin_lock(&tree->lock); |
9655d298 CM |
801 | if (cached_state && *cached_state) { |
802 | state = *cached_state; | |
df98b6e2 JB |
803 | if (state->start <= start && state->end > start && |
804 | state->tree) { | |
9655d298 CM |
805 | node = &state->rb_node; |
806 | goto hit_next; | |
807 | } | |
808 | } | |
d1310b2e CM |
809 | /* |
810 | * this search will find all the extents that end after | |
811 | * our range starts. | |
812 | */ | |
80ea96b1 | 813 | node = tree_search(tree, start); |
d1310b2e | 814 | if (!node) { |
8233767a XG |
815 | prealloc = alloc_extent_state_atomic(prealloc); |
816 | BUG_ON(!prealloc); | |
0ca1f7ce | 817 | err = insert_state(tree, prealloc, start, end, &bits); |
c2d904e0 JM |
818 | if (err) |
819 | extent_io_tree_panic(tree, err); | |
820 | ||
d1310b2e | 821 | prealloc = NULL; |
d1310b2e CM |
822 | goto out; |
823 | } | |
d1310b2e | 824 | state = rb_entry(node, struct extent_state, rb_node); |
40431d6c | 825 | hit_next: |
d1310b2e CM |
826 | last_start = state->start; |
827 | last_end = state->end; | |
828 | ||
829 | /* | |
830 | * | ---- desired range ---- | | |
831 | * | state | | |
832 | * | |
833 | * Just lock what we found and keep going | |
834 | */ | |
835 | if (state->start == start && state->end <= end) { | |
1edbb734 | 836 | if (state->state & exclusive_bits) { |
d1310b2e CM |
837 | *failed_start = state->start; |
838 | err = -EEXIST; | |
839 | goto out; | |
840 | } | |
42daec29 | 841 | |
1bf85046 | 842 | set_state_bits(tree, state, &bits); |
2c64c53d | 843 | cache_state(state, cached_state); |
d1310b2e | 844 | merge_state(tree, state); |
5c939df5 YZ |
845 | if (last_end == (u64)-1) |
846 | goto out; | |
847 | start = last_end + 1; | |
d1ac6e41 LB |
848 | state = next_state(state); |
849 | if (start < end && state && state->start == start && | |
850 | !need_resched()) | |
851 | goto hit_next; | |
d1310b2e CM |
852 | goto search_again; |
853 | } | |
854 | ||
855 | /* | |
856 | * | ---- desired range ---- | | |
857 | * | state | | |
858 | * or | |
859 | * | ------------- state -------------- | | |
860 | * | |
861 | * We need to split the extent we found, and may flip bits on | |
862 | * second half. | |
863 | * | |
864 | * If the extent we found extends past our | |
865 | * range, we just split and search again. It'll get split | |
866 | * again the next time though. | |
867 | * | |
868 | * If the extent we found is inside our range, we set the | |
869 | * desired bit on it. | |
870 | */ | |
871 | if (state->start < start) { | |
1edbb734 | 872 | if (state->state & exclusive_bits) { |
d1310b2e CM |
873 | *failed_start = start; |
874 | err = -EEXIST; | |
875 | goto out; | |
876 | } | |
8233767a XG |
877 | |
878 | prealloc = alloc_extent_state_atomic(prealloc); | |
879 | BUG_ON(!prealloc); | |
d1310b2e | 880 | err = split_state(tree, state, prealloc, start); |
c2d904e0 JM |
881 | if (err) |
882 | extent_io_tree_panic(tree, err); | |
883 | ||
d1310b2e CM |
884 | prealloc = NULL; |
885 | if (err) | |
886 | goto out; | |
887 | if (state->end <= end) { | |
1bf85046 | 888 | set_state_bits(tree, state, &bits); |
2c64c53d | 889 | cache_state(state, cached_state); |
d1310b2e | 890 | merge_state(tree, state); |
5c939df5 YZ |
891 | if (last_end == (u64)-1) |
892 | goto out; | |
893 | start = last_end + 1; | |
d1ac6e41 LB |
894 | state = next_state(state); |
895 | if (start < end && state && state->start == start && | |
896 | !need_resched()) | |
897 | goto hit_next; | |
d1310b2e CM |
898 | } |
899 | goto search_again; | |
900 | } | |
901 | /* | |
902 | * | ---- desired range ---- | | |
903 | * | state | or | state | | |
904 | * | |
905 | * There's a hole, we need to insert something in it and | |
906 | * ignore the extent we found. | |
907 | */ | |
908 | if (state->start > start) { | |
909 | u64 this_end; | |
910 | if (end < last_start) | |
911 | this_end = end; | |
912 | else | |
d397712b | 913 | this_end = last_start - 1; |
8233767a XG |
914 | |
915 | prealloc = alloc_extent_state_atomic(prealloc); | |
916 | BUG_ON(!prealloc); | |
c7f895a2 XG |
917 | |
918 | /* | |
919 | * Avoid to free 'prealloc' if it can be merged with | |
920 | * the later extent. | |
921 | */ | |
d1310b2e | 922 | err = insert_state(tree, prealloc, start, this_end, |
0ca1f7ce | 923 | &bits); |
c2d904e0 JM |
924 | if (err) |
925 | extent_io_tree_panic(tree, err); | |
926 | ||
9ed74f2d JB |
927 | cache_state(prealloc, cached_state); |
928 | prealloc = NULL; | |
d1310b2e CM |
929 | start = this_end + 1; |
930 | goto search_again; | |
931 | } | |
932 | /* | |
933 | * | ---- desired range ---- | | |
934 | * | state | | |
935 | * We need to split the extent, and set the bit | |
936 | * on the first half | |
937 | */ | |
938 | if (state->start <= end && state->end > end) { | |
1edbb734 | 939 | if (state->state & exclusive_bits) { |
d1310b2e CM |
940 | *failed_start = start; |
941 | err = -EEXIST; | |
942 | goto out; | |
943 | } | |
8233767a XG |
944 | |
945 | prealloc = alloc_extent_state_atomic(prealloc); | |
946 | BUG_ON(!prealloc); | |
d1310b2e | 947 | err = split_state(tree, state, prealloc, end + 1); |
c2d904e0 JM |
948 | if (err) |
949 | extent_io_tree_panic(tree, err); | |
d1310b2e | 950 | |
1bf85046 | 951 | set_state_bits(tree, prealloc, &bits); |
2c64c53d | 952 | cache_state(prealloc, cached_state); |
d1310b2e CM |
953 | merge_state(tree, prealloc); |
954 | prealloc = NULL; | |
955 | goto out; | |
956 | } | |
957 | ||
958 | goto search_again; | |
959 | ||
960 | out: | |
cad321ad | 961 | spin_unlock(&tree->lock); |
d1310b2e CM |
962 | if (prealloc) |
963 | free_extent_state(prealloc); | |
964 | ||
965 | return err; | |
966 | ||
967 | search_again: | |
968 | if (start > end) | |
969 | goto out; | |
cad321ad | 970 | spin_unlock(&tree->lock); |
d1310b2e CM |
971 | if (mask & __GFP_WAIT) |
972 | cond_resched(); | |
973 | goto again; | |
974 | } | |
d1310b2e | 975 | |
41074888 DS |
976 | int set_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, |
977 | unsigned long bits, u64 * failed_start, | |
978 | struct extent_state **cached_state, gfp_t mask) | |
3fbe5c02 JM |
979 | { |
980 | return __set_extent_bit(tree, start, end, bits, 0, failed_start, | |
981 | cached_state, mask); | |
982 | } | |
983 | ||
984 | ||
462d6fac | 985 | /** |
10983f2e LB |
986 | * convert_extent_bit - convert all bits in a given range from one bit to |
987 | * another | |
462d6fac JB |
988 | * @tree: the io tree to search |
989 | * @start: the start offset in bytes | |
990 | * @end: the end offset in bytes (inclusive) | |
991 | * @bits: the bits to set in this range | |
992 | * @clear_bits: the bits to clear in this range | |
e6138876 | 993 | * @cached_state: state that we're going to cache |
462d6fac JB |
994 | * @mask: the allocation mask |
995 | * | |
996 | * This will go through and set bits for the given range. If any states exist | |
997 | * already in this range they are set with the given bit and cleared of the | |
998 | * clear_bits. This is only meant to be used by things that are mergeable, ie | |
999 | * converting from say DELALLOC to DIRTY. This is not meant to be used with | |
1000 | * boundary bits like LOCK. | |
1001 | */ | |
1002 | int convert_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, | |
41074888 | 1003 | unsigned long bits, unsigned long clear_bits, |
e6138876 | 1004 | struct extent_state **cached_state, gfp_t mask) |
462d6fac JB |
1005 | { |
1006 | struct extent_state *state; | |
1007 | struct extent_state *prealloc = NULL; | |
1008 | struct rb_node *node; | |
1009 | int err = 0; | |
1010 | u64 last_start; | |
1011 | u64 last_end; | |
1012 | ||
8d599ae1 DS |
1013 | btrfs_debug_check_extent_io_range(tree->mapping->host, start, end); |
1014 | ||
462d6fac JB |
1015 | again: |
1016 | if (!prealloc && (mask & __GFP_WAIT)) { | |
1017 | prealloc = alloc_extent_state(mask); | |
1018 | if (!prealloc) | |
1019 | return -ENOMEM; | |
1020 | } | |
1021 | ||
1022 | spin_lock(&tree->lock); | |
e6138876 JB |
1023 | if (cached_state && *cached_state) { |
1024 | state = *cached_state; | |
1025 | if (state->start <= start && state->end > start && | |
1026 | state->tree) { | |
1027 | node = &state->rb_node; | |
1028 | goto hit_next; | |
1029 | } | |
1030 | } | |
1031 | ||
462d6fac JB |
1032 | /* |
1033 | * this search will find all the extents that end after | |
1034 | * our range starts. | |
1035 | */ | |
1036 | node = tree_search(tree, start); | |
1037 | if (!node) { | |
1038 | prealloc = alloc_extent_state_atomic(prealloc); | |
1cf4ffdb LB |
1039 | if (!prealloc) { |
1040 | err = -ENOMEM; | |
1041 | goto out; | |
1042 | } | |
462d6fac JB |
1043 | err = insert_state(tree, prealloc, start, end, &bits); |
1044 | prealloc = NULL; | |
c2d904e0 JM |
1045 | if (err) |
1046 | extent_io_tree_panic(tree, err); | |
462d6fac JB |
1047 | goto out; |
1048 | } | |
1049 | state = rb_entry(node, struct extent_state, rb_node); | |
1050 | hit_next: | |
1051 | last_start = state->start; | |
1052 | last_end = state->end; | |
1053 | ||
1054 | /* | |
1055 | * | ---- desired range ---- | | |
1056 | * | state | | |
1057 | * | |
1058 | * Just lock what we found and keep going | |
1059 | */ | |
1060 | if (state->start == start && state->end <= end) { | |
462d6fac | 1061 | set_state_bits(tree, state, &bits); |
e6138876 | 1062 | cache_state(state, cached_state); |
d1ac6e41 | 1063 | state = clear_state_bit(tree, state, &clear_bits, 0); |
462d6fac JB |
1064 | if (last_end == (u64)-1) |
1065 | goto out; | |
462d6fac | 1066 | start = last_end + 1; |
d1ac6e41 LB |
1067 | if (start < end && state && state->start == start && |
1068 | !need_resched()) | |
1069 | goto hit_next; | |
462d6fac JB |
1070 | goto search_again; |
1071 | } | |
1072 | ||
1073 | /* | |
1074 | * | ---- desired range ---- | | |
1075 | * | state | | |
1076 | * or | |
1077 | * | ------------- state -------------- | | |
1078 | * | |
1079 | * We need to split the extent we found, and may flip bits on | |
1080 | * second half. | |
1081 | * | |
1082 | * If the extent we found extends past our | |
1083 | * range, we just split and search again. It'll get split | |
1084 | * again the next time though. | |
1085 | * | |
1086 | * If the extent we found is inside our range, we set the | |
1087 | * desired bit on it. | |
1088 | */ | |
1089 | if (state->start < start) { | |
1090 | prealloc = alloc_extent_state_atomic(prealloc); | |
1cf4ffdb LB |
1091 | if (!prealloc) { |
1092 | err = -ENOMEM; | |
1093 | goto out; | |
1094 | } | |
462d6fac | 1095 | err = split_state(tree, state, prealloc, start); |
c2d904e0 JM |
1096 | if (err) |
1097 | extent_io_tree_panic(tree, err); | |
462d6fac JB |
1098 | prealloc = NULL; |
1099 | if (err) | |
1100 | goto out; | |
1101 | if (state->end <= end) { | |
1102 | set_state_bits(tree, state, &bits); | |
e6138876 | 1103 | cache_state(state, cached_state); |
d1ac6e41 | 1104 | state = clear_state_bit(tree, state, &clear_bits, 0); |
462d6fac JB |
1105 | if (last_end == (u64)-1) |
1106 | goto out; | |
1107 | start = last_end + 1; | |
d1ac6e41 LB |
1108 | if (start < end && state && state->start == start && |
1109 | !need_resched()) | |
1110 | goto hit_next; | |
462d6fac JB |
1111 | } |
1112 | goto search_again; | |
1113 | } | |
1114 | /* | |
1115 | * | ---- desired range ---- | | |
1116 | * | state | or | state | | |
1117 | * | |
1118 | * There's a hole, we need to insert something in it and | |
1119 | * ignore the extent we found. | |
1120 | */ | |
1121 | if (state->start > start) { | |
1122 | u64 this_end; | |
1123 | if (end < last_start) | |
1124 | this_end = end; | |
1125 | else | |
1126 | this_end = last_start - 1; | |
1127 | ||
1128 | prealloc = alloc_extent_state_atomic(prealloc); | |
1cf4ffdb LB |
1129 | if (!prealloc) { |
1130 | err = -ENOMEM; | |
1131 | goto out; | |
1132 | } | |
462d6fac JB |
1133 | |
1134 | /* | |
1135 | * Avoid to free 'prealloc' if it can be merged with | |
1136 | * the later extent. | |
1137 | */ | |
1138 | err = insert_state(tree, prealloc, start, this_end, | |
1139 | &bits); | |
c2d904e0 JM |
1140 | if (err) |
1141 | extent_io_tree_panic(tree, err); | |
e6138876 | 1142 | cache_state(prealloc, cached_state); |
462d6fac JB |
1143 | prealloc = NULL; |
1144 | start = this_end + 1; | |
1145 | goto search_again; | |
1146 | } | |
1147 | /* | |
1148 | * | ---- desired range ---- | | |
1149 | * | state | | |
1150 | * We need to split the extent, and set the bit | |
1151 | * on the first half | |
1152 | */ | |
1153 | if (state->start <= end && state->end > end) { | |
1154 | prealloc = alloc_extent_state_atomic(prealloc); | |
1cf4ffdb LB |
1155 | if (!prealloc) { |
1156 | err = -ENOMEM; | |
1157 | goto out; | |
1158 | } | |
462d6fac JB |
1159 | |
1160 | err = split_state(tree, state, prealloc, end + 1); | |
c2d904e0 JM |
1161 | if (err) |
1162 | extent_io_tree_panic(tree, err); | |
462d6fac JB |
1163 | |
1164 | set_state_bits(tree, prealloc, &bits); | |
e6138876 | 1165 | cache_state(prealloc, cached_state); |
462d6fac | 1166 | clear_state_bit(tree, prealloc, &clear_bits, 0); |
462d6fac JB |
1167 | prealloc = NULL; |
1168 | goto out; | |
1169 | } | |
1170 | ||
1171 | goto search_again; | |
1172 | ||
1173 | out: | |
1174 | spin_unlock(&tree->lock); | |
1175 | if (prealloc) | |
1176 | free_extent_state(prealloc); | |
1177 | ||
1178 | return err; | |
1179 | ||
1180 | search_again: | |
1181 | if (start > end) | |
1182 | goto out; | |
1183 | spin_unlock(&tree->lock); | |
1184 | if (mask & __GFP_WAIT) | |
1185 | cond_resched(); | |
1186 | goto again; | |
1187 | } | |
1188 | ||
d1310b2e CM |
1189 | /* wrappers around set/clear extent bit */ |
1190 | int set_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end, | |
1191 | gfp_t mask) | |
1192 | { | |
3fbe5c02 | 1193 | return set_extent_bit(tree, start, end, EXTENT_DIRTY, NULL, |
2c64c53d | 1194 | NULL, mask); |
d1310b2e | 1195 | } |
d1310b2e CM |
1196 | |
1197 | int set_extent_bits(struct extent_io_tree *tree, u64 start, u64 end, | |
41074888 | 1198 | unsigned long bits, gfp_t mask) |
d1310b2e | 1199 | { |
3fbe5c02 | 1200 | return set_extent_bit(tree, start, end, bits, NULL, |
2c64c53d | 1201 | NULL, mask); |
d1310b2e | 1202 | } |
d1310b2e CM |
1203 | |
1204 | int clear_extent_bits(struct extent_io_tree *tree, u64 start, u64 end, | |
41074888 | 1205 | unsigned long bits, gfp_t mask) |
d1310b2e | 1206 | { |
2c64c53d | 1207 | return clear_extent_bit(tree, start, end, bits, 0, 0, NULL, mask); |
d1310b2e | 1208 | } |
d1310b2e CM |
1209 | |
1210 | int set_extent_delalloc(struct extent_io_tree *tree, u64 start, u64 end, | |
2ac55d41 | 1211 | struct extent_state **cached_state, gfp_t mask) |
d1310b2e CM |
1212 | { |
1213 | return set_extent_bit(tree, start, end, | |
fee187d9 | 1214 | EXTENT_DELALLOC | EXTENT_UPTODATE, |
3fbe5c02 | 1215 | NULL, cached_state, mask); |
d1310b2e | 1216 | } |
d1310b2e | 1217 | |
9e8a4a8b LB |
1218 | int set_extent_defrag(struct extent_io_tree *tree, u64 start, u64 end, |
1219 | struct extent_state **cached_state, gfp_t mask) | |
1220 | { | |
1221 | return set_extent_bit(tree, start, end, | |
1222 | EXTENT_DELALLOC | EXTENT_UPTODATE | EXTENT_DEFRAG, | |
1223 | NULL, cached_state, mask); | |
1224 | } | |
1225 | ||
d1310b2e CM |
1226 | int clear_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end, |
1227 | gfp_t mask) | |
1228 | { | |
1229 | return clear_extent_bit(tree, start, end, | |
32c00aff | 1230 | EXTENT_DIRTY | EXTENT_DELALLOC | |
0ca1f7ce | 1231 | EXTENT_DO_ACCOUNTING, 0, 0, NULL, mask); |
d1310b2e | 1232 | } |
d1310b2e CM |
1233 | |
1234 | int set_extent_new(struct extent_io_tree *tree, u64 start, u64 end, | |
1235 | gfp_t mask) | |
1236 | { | |
3fbe5c02 | 1237 | return set_extent_bit(tree, start, end, EXTENT_NEW, NULL, |
2c64c53d | 1238 | NULL, mask); |
d1310b2e | 1239 | } |
d1310b2e | 1240 | |
d1310b2e | 1241 | int set_extent_uptodate(struct extent_io_tree *tree, u64 start, u64 end, |
507903b8 | 1242 | struct extent_state **cached_state, gfp_t mask) |
d1310b2e | 1243 | { |
6b67a320 | 1244 | return set_extent_bit(tree, start, end, EXTENT_UPTODATE, NULL, |
3fbe5c02 | 1245 | cached_state, mask); |
d1310b2e | 1246 | } |
d1310b2e | 1247 | |
5fd02043 JB |
1248 | int clear_extent_uptodate(struct extent_io_tree *tree, u64 start, u64 end, |
1249 | struct extent_state **cached_state, gfp_t mask) | |
d1310b2e | 1250 | { |
2c64c53d | 1251 | return clear_extent_bit(tree, start, end, EXTENT_UPTODATE, 0, 0, |
2ac55d41 | 1252 | cached_state, mask); |
d1310b2e | 1253 | } |
d1310b2e | 1254 | |
d352ac68 CM |
1255 | /* |
1256 | * either insert or lock state struct between start and end use mask to tell | |
1257 | * us if waiting is desired. | |
1258 | */ | |
1edbb734 | 1259 | int lock_extent_bits(struct extent_io_tree *tree, u64 start, u64 end, |
41074888 | 1260 | unsigned long bits, struct extent_state **cached_state) |
d1310b2e CM |
1261 | { |
1262 | int err; | |
1263 | u64 failed_start; | |
1264 | while (1) { | |
3fbe5c02 JM |
1265 | err = __set_extent_bit(tree, start, end, EXTENT_LOCKED | bits, |
1266 | EXTENT_LOCKED, &failed_start, | |
1267 | cached_state, GFP_NOFS); | |
d0082371 | 1268 | if (err == -EEXIST) { |
d1310b2e CM |
1269 | wait_extent_bit(tree, failed_start, end, EXTENT_LOCKED); |
1270 | start = failed_start; | |
d0082371 | 1271 | } else |
d1310b2e | 1272 | break; |
d1310b2e CM |
1273 | WARN_ON(start > end); |
1274 | } | |
1275 | return err; | |
1276 | } | |
d1310b2e | 1277 | |
d0082371 | 1278 | int lock_extent(struct extent_io_tree *tree, u64 start, u64 end) |
1edbb734 | 1279 | { |
d0082371 | 1280 | return lock_extent_bits(tree, start, end, 0, NULL); |
1edbb734 CM |
1281 | } |
1282 | ||
d0082371 | 1283 | int try_lock_extent(struct extent_io_tree *tree, u64 start, u64 end) |
25179201 JB |
1284 | { |
1285 | int err; | |
1286 | u64 failed_start; | |
1287 | ||
3fbe5c02 JM |
1288 | err = __set_extent_bit(tree, start, end, EXTENT_LOCKED, EXTENT_LOCKED, |
1289 | &failed_start, NULL, GFP_NOFS); | |
6643558d YZ |
1290 | if (err == -EEXIST) { |
1291 | if (failed_start > start) | |
1292 | clear_extent_bit(tree, start, failed_start - 1, | |
d0082371 | 1293 | EXTENT_LOCKED, 1, 0, NULL, GFP_NOFS); |
25179201 | 1294 | return 0; |
6643558d | 1295 | } |
25179201 JB |
1296 | return 1; |
1297 | } | |
25179201 | 1298 | |
2c64c53d CM |
1299 | int unlock_extent_cached(struct extent_io_tree *tree, u64 start, u64 end, |
1300 | struct extent_state **cached, gfp_t mask) | |
1301 | { | |
1302 | return clear_extent_bit(tree, start, end, EXTENT_LOCKED, 1, 0, cached, | |
1303 | mask); | |
1304 | } | |
1305 | ||
d0082371 | 1306 | int unlock_extent(struct extent_io_tree *tree, u64 start, u64 end) |
d1310b2e | 1307 | { |
2c64c53d | 1308 | return clear_extent_bit(tree, start, end, EXTENT_LOCKED, 1, 0, NULL, |
d0082371 | 1309 | GFP_NOFS); |
d1310b2e | 1310 | } |
d1310b2e | 1311 | |
4adaa611 CM |
1312 | int extent_range_clear_dirty_for_io(struct inode *inode, u64 start, u64 end) |
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(inode->i_mapping, index); | |
1320 | BUG_ON(!page); /* Pages should be in the extent_io_tree */ | |
1321 | clear_page_dirty_for_io(page); | |
1322 | page_cache_release(page); | |
1323 | index++; | |
1324 | } | |
1325 | return 0; | |
1326 | } | |
1327 | ||
1328 | int extent_range_redirty_for_io(struct inode *inode, u64 start, u64 end) | |
1329 | { | |
1330 | unsigned long index = start >> PAGE_CACHE_SHIFT; | |
1331 | unsigned long end_index = end >> PAGE_CACHE_SHIFT; | |
1332 | struct page *page; | |
1333 | ||
1334 | while (index <= end_index) { | |
1335 | page = find_get_page(inode->i_mapping, index); | |
1336 | BUG_ON(!page); /* Pages should be in the extent_io_tree */ | |
1337 | account_page_redirty(page); | |
1338 | __set_page_dirty_nobuffers(page); | |
1339 | page_cache_release(page); | |
1340 | index++; | |
1341 | } | |
1342 | return 0; | |
1343 | } | |
1344 | ||
d1310b2e CM |
1345 | /* |
1346 | * helper function to set both pages and extents in the tree writeback | |
1347 | */ | |
b2950863 | 1348 | static int set_range_writeback(struct extent_io_tree *tree, u64 start, u64 end) |
d1310b2e CM |
1349 | { |
1350 | unsigned long index = start >> PAGE_CACHE_SHIFT; | |
1351 | unsigned long end_index = end >> PAGE_CACHE_SHIFT; | |
1352 | struct page *page; | |
1353 | ||
1354 | while (index <= end_index) { | |
1355 | page = find_get_page(tree->mapping, index); | |
79787eaa | 1356 | BUG_ON(!page); /* Pages should be in the extent_io_tree */ |
d1310b2e CM |
1357 | set_page_writeback(page); |
1358 | page_cache_release(page); | |
1359 | index++; | |
1360 | } | |
d1310b2e CM |
1361 | return 0; |
1362 | } | |
d1310b2e | 1363 | |
d352ac68 CM |
1364 | /* find the first state struct with 'bits' set after 'start', and |
1365 | * return it. tree->lock must be held. NULL will returned if | |
1366 | * nothing was found after 'start' | |
1367 | */ | |
48a3b636 ES |
1368 | static struct extent_state * |
1369 | find_first_extent_bit_state(struct extent_io_tree *tree, | |
41074888 | 1370 | u64 start, unsigned long bits) |
d7fc640e CM |
1371 | { |
1372 | struct rb_node *node; | |
1373 | struct extent_state *state; | |
1374 | ||
1375 | /* | |
1376 | * this search will find all the extents that end after | |
1377 | * our range starts. | |
1378 | */ | |
1379 | node = tree_search(tree, start); | |
d397712b | 1380 | if (!node) |
d7fc640e | 1381 | goto out; |
d7fc640e | 1382 | |
d397712b | 1383 | while (1) { |
d7fc640e | 1384 | state = rb_entry(node, struct extent_state, rb_node); |
d397712b | 1385 | if (state->end >= start && (state->state & bits)) |
d7fc640e | 1386 | return state; |
d397712b | 1387 | |
d7fc640e CM |
1388 | node = rb_next(node); |
1389 | if (!node) | |
1390 | break; | |
1391 | } | |
1392 | out: | |
1393 | return NULL; | |
1394 | } | |
d7fc640e | 1395 | |
69261c4b XG |
1396 | /* |
1397 | * find the first offset in the io tree with 'bits' set. zero is | |
1398 | * returned if we find something, and *start_ret and *end_ret are | |
1399 | * set to reflect the state struct that was found. | |
1400 | * | |
477d7eaf | 1401 | * If nothing was found, 1 is returned. If found something, return 0. |
69261c4b XG |
1402 | */ |
1403 | int find_first_extent_bit(struct extent_io_tree *tree, u64 start, | |
41074888 | 1404 | u64 *start_ret, u64 *end_ret, unsigned long bits, |
e6138876 | 1405 | struct extent_state **cached_state) |
69261c4b XG |
1406 | { |
1407 | struct extent_state *state; | |
e6138876 | 1408 | struct rb_node *n; |
69261c4b XG |
1409 | int ret = 1; |
1410 | ||
1411 | spin_lock(&tree->lock); | |
e6138876 JB |
1412 | if (cached_state && *cached_state) { |
1413 | state = *cached_state; | |
1414 | if (state->end == start - 1 && state->tree) { | |
1415 | n = rb_next(&state->rb_node); | |
1416 | while (n) { | |
1417 | state = rb_entry(n, struct extent_state, | |
1418 | rb_node); | |
1419 | if (state->state & bits) | |
1420 | goto got_it; | |
1421 | n = rb_next(n); | |
1422 | } | |
1423 | free_extent_state(*cached_state); | |
1424 | *cached_state = NULL; | |
1425 | goto out; | |
1426 | } | |
1427 | free_extent_state(*cached_state); | |
1428 | *cached_state = NULL; | |
1429 | } | |
1430 | ||
69261c4b | 1431 | state = find_first_extent_bit_state(tree, start, bits); |
e6138876 | 1432 | got_it: |
69261c4b | 1433 | if (state) { |
e6138876 | 1434 | cache_state(state, cached_state); |
69261c4b XG |
1435 | *start_ret = state->start; |
1436 | *end_ret = state->end; | |
1437 | ret = 0; | |
1438 | } | |
e6138876 | 1439 | out: |
69261c4b XG |
1440 | spin_unlock(&tree->lock); |
1441 | return ret; | |
1442 | } | |
1443 | ||
d352ac68 CM |
1444 | /* |
1445 | * find a contiguous range of bytes in the file marked as delalloc, not | |
1446 | * more than 'max_bytes'. start and end are used to return the range, | |
1447 | * | |
1448 | * 1 is returned if we find something, 0 if nothing was in the tree | |
1449 | */ | |
c8b97818 | 1450 | static noinline u64 find_delalloc_range(struct extent_io_tree *tree, |
c2a128d2 JB |
1451 | u64 *start, u64 *end, u64 max_bytes, |
1452 | struct extent_state **cached_state) | |
d1310b2e CM |
1453 | { |
1454 | struct rb_node *node; | |
1455 | struct extent_state *state; | |
1456 | u64 cur_start = *start; | |
1457 | u64 found = 0; | |
1458 | u64 total_bytes = 0; | |
1459 | ||
cad321ad | 1460 | spin_lock(&tree->lock); |
c8b97818 | 1461 | |
d1310b2e CM |
1462 | /* |
1463 | * this search will find all the extents that end after | |
1464 | * our range starts. | |
1465 | */ | |
80ea96b1 | 1466 | node = tree_search(tree, cur_start); |
2b114d1d | 1467 | if (!node) { |
3b951516 CM |
1468 | if (!found) |
1469 | *end = (u64)-1; | |
d1310b2e CM |
1470 | goto out; |
1471 | } | |
1472 | ||
d397712b | 1473 | while (1) { |
d1310b2e | 1474 | state = rb_entry(node, struct extent_state, rb_node); |
5b21f2ed ZY |
1475 | if (found && (state->start != cur_start || |
1476 | (state->state & EXTENT_BOUNDARY))) { | |
d1310b2e CM |
1477 | goto out; |
1478 | } | |
1479 | if (!(state->state & EXTENT_DELALLOC)) { | |
1480 | if (!found) | |
1481 | *end = state->end; | |
1482 | goto out; | |
1483 | } | |
c2a128d2 | 1484 | if (!found) { |
d1310b2e | 1485 | *start = state->start; |
c2a128d2 JB |
1486 | *cached_state = state; |
1487 | atomic_inc(&state->refs); | |
1488 | } | |
d1310b2e CM |
1489 | found++; |
1490 | *end = state->end; | |
1491 | cur_start = state->end + 1; | |
1492 | node = rb_next(node); | |
d1310b2e | 1493 | total_bytes += state->end - state->start + 1; |
7bf811a5 | 1494 | if (total_bytes >= max_bytes) |
573aecaf | 1495 | break; |
573aecaf | 1496 | if (!node) |
d1310b2e CM |
1497 | break; |
1498 | } | |
1499 | out: | |
cad321ad | 1500 | spin_unlock(&tree->lock); |
d1310b2e CM |
1501 | return found; |
1502 | } | |
1503 | ||
143bede5 JM |
1504 | static noinline void __unlock_for_delalloc(struct inode *inode, |
1505 | struct page *locked_page, | |
1506 | u64 start, u64 end) | |
c8b97818 CM |
1507 | { |
1508 | int ret; | |
1509 | struct page *pages[16]; | |
1510 | unsigned long index = start >> PAGE_CACHE_SHIFT; | |
1511 | unsigned long end_index = end >> PAGE_CACHE_SHIFT; | |
1512 | unsigned long nr_pages = end_index - index + 1; | |
1513 | int i; | |
1514 | ||
1515 | if (index == locked_page->index && end_index == index) | |
143bede5 | 1516 | return; |
c8b97818 | 1517 | |
d397712b | 1518 | while (nr_pages > 0) { |
c8b97818 | 1519 | ret = find_get_pages_contig(inode->i_mapping, index, |
5b050f04 CM |
1520 | min_t(unsigned long, nr_pages, |
1521 | ARRAY_SIZE(pages)), pages); | |
c8b97818 CM |
1522 | for (i = 0; i < ret; i++) { |
1523 | if (pages[i] != locked_page) | |
1524 | unlock_page(pages[i]); | |
1525 | page_cache_release(pages[i]); | |
1526 | } | |
1527 | nr_pages -= ret; | |
1528 | index += ret; | |
1529 | cond_resched(); | |
1530 | } | |
c8b97818 CM |
1531 | } |
1532 | ||
1533 | static noinline int lock_delalloc_pages(struct inode *inode, | |
1534 | struct page *locked_page, | |
1535 | u64 delalloc_start, | |
1536 | u64 delalloc_end) | |
1537 | { | |
1538 | unsigned long index = delalloc_start >> PAGE_CACHE_SHIFT; | |
1539 | unsigned long start_index = index; | |
1540 | unsigned long end_index = delalloc_end >> PAGE_CACHE_SHIFT; | |
1541 | unsigned long pages_locked = 0; | |
1542 | struct page *pages[16]; | |
1543 | unsigned long nrpages; | |
1544 | int ret; | |
1545 | int i; | |
1546 | ||
1547 | /* the caller is responsible for locking the start index */ | |
1548 | if (index == locked_page->index && index == end_index) | |
1549 | return 0; | |
1550 | ||
1551 | /* skip the page at the start index */ | |
1552 | nrpages = end_index - index + 1; | |
d397712b | 1553 | while (nrpages > 0) { |
c8b97818 | 1554 | ret = find_get_pages_contig(inode->i_mapping, index, |
5b050f04 CM |
1555 | min_t(unsigned long, |
1556 | nrpages, ARRAY_SIZE(pages)), pages); | |
c8b97818 CM |
1557 | if (ret == 0) { |
1558 | ret = -EAGAIN; | |
1559 | goto done; | |
1560 | } | |
1561 | /* now we have an array of pages, lock them all */ | |
1562 | for (i = 0; i < ret; i++) { | |
1563 | /* | |
1564 | * the caller is taking responsibility for | |
1565 | * locked_page | |
1566 | */ | |
771ed689 | 1567 | if (pages[i] != locked_page) { |
c8b97818 | 1568 | lock_page(pages[i]); |
f2b1c41c CM |
1569 | if (!PageDirty(pages[i]) || |
1570 | pages[i]->mapping != inode->i_mapping) { | |
771ed689 CM |
1571 | ret = -EAGAIN; |
1572 | unlock_page(pages[i]); | |
1573 | page_cache_release(pages[i]); | |
1574 | goto done; | |
1575 | } | |
1576 | } | |
c8b97818 | 1577 | page_cache_release(pages[i]); |
771ed689 | 1578 | pages_locked++; |
c8b97818 | 1579 | } |
c8b97818 CM |
1580 | nrpages -= ret; |
1581 | index += ret; | |
1582 | cond_resched(); | |
1583 | } | |
1584 | ret = 0; | |
1585 | done: | |
1586 | if (ret && pages_locked) { | |
1587 | __unlock_for_delalloc(inode, locked_page, | |
1588 | delalloc_start, | |
1589 | ((u64)(start_index + pages_locked - 1)) << | |
1590 | PAGE_CACHE_SHIFT); | |
1591 | } | |
1592 | return ret; | |
1593 | } | |
1594 | ||
1595 | /* | |
1596 | * find a contiguous range of bytes in the file marked as delalloc, not | |
1597 | * more than 'max_bytes'. start and end are used to return the range, | |
1598 | * | |
1599 | * 1 is returned if we find something, 0 if nothing was in the tree | |
1600 | */ | |
294e30fe JB |
1601 | STATIC u64 find_lock_delalloc_range(struct inode *inode, |
1602 | struct extent_io_tree *tree, | |
1603 | struct page *locked_page, u64 *start, | |
1604 | u64 *end, u64 max_bytes) | |
c8b97818 CM |
1605 | { |
1606 | u64 delalloc_start; | |
1607 | u64 delalloc_end; | |
1608 | u64 found; | |
9655d298 | 1609 | struct extent_state *cached_state = NULL; |
c8b97818 CM |
1610 | int ret; |
1611 | int loops = 0; | |
1612 | ||
1613 | again: | |
1614 | /* step one, find a bunch of delalloc bytes starting at start */ | |
1615 | delalloc_start = *start; | |
1616 | delalloc_end = 0; | |
1617 | found = find_delalloc_range(tree, &delalloc_start, &delalloc_end, | |
c2a128d2 | 1618 | max_bytes, &cached_state); |
70b99e69 | 1619 | if (!found || delalloc_end <= *start) { |
c8b97818 CM |
1620 | *start = delalloc_start; |
1621 | *end = delalloc_end; | |
c2a128d2 | 1622 | free_extent_state(cached_state); |
385fe0be | 1623 | return 0; |
c8b97818 CM |
1624 | } |
1625 | ||
70b99e69 CM |
1626 | /* |
1627 | * start comes from the offset of locked_page. We have to lock | |
1628 | * pages in order, so we can't process delalloc bytes before | |
1629 | * locked_page | |
1630 | */ | |
d397712b | 1631 | if (delalloc_start < *start) |
70b99e69 | 1632 | delalloc_start = *start; |
70b99e69 | 1633 | |
c8b97818 CM |
1634 | /* |
1635 | * make sure to limit the number of pages we try to lock down | |
c8b97818 | 1636 | */ |
7bf811a5 JB |
1637 | if (delalloc_end + 1 - delalloc_start > max_bytes) |
1638 | delalloc_end = delalloc_start + max_bytes - 1; | |
d397712b | 1639 | |
c8b97818 CM |
1640 | /* step two, lock all the pages after the page that has start */ |
1641 | ret = lock_delalloc_pages(inode, locked_page, | |
1642 | delalloc_start, delalloc_end); | |
1643 | if (ret == -EAGAIN) { | |
1644 | /* some of the pages are gone, lets avoid looping by | |
1645 | * shortening the size of the delalloc range we're searching | |
1646 | */ | |
9655d298 | 1647 | free_extent_state(cached_state); |
c8b97818 | 1648 | if (!loops) { |
7bf811a5 | 1649 | max_bytes = PAGE_CACHE_SIZE; |
c8b97818 CM |
1650 | loops = 1; |
1651 | goto again; | |
1652 | } else { | |
1653 | found = 0; | |
1654 | goto out_failed; | |
1655 | } | |
1656 | } | |
79787eaa | 1657 | BUG_ON(ret); /* Only valid values are 0 and -EAGAIN */ |
c8b97818 CM |
1658 | |
1659 | /* step three, lock the state bits for the whole range */ | |
d0082371 | 1660 | lock_extent_bits(tree, delalloc_start, delalloc_end, 0, &cached_state); |
c8b97818 CM |
1661 | |
1662 | /* then test to make sure it is all still delalloc */ | |
1663 | ret = test_range_bit(tree, delalloc_start, delalloc_end, | |
9655d298 | 1664 | EXTENT_DELALLOC, 1, cached_state); |
c8b97818 | 1665 | if (!ret) { |
9655d298 CM |
1666 | unlock_extent_cached(tree, delalloc_start, delalloc_end, |
1667 | &cached_state, GFP_NOFS); | |
c8b97818 CM |
1668 | __unlock_for_delalloc(inode, locked_page, |
1669 | delalloc_start, delalloc_end); | |
1670 | cond_resched(); | |
1671 | goto again; | |
1672 | } | |
9655d298 | 1673 | free_extent_state(cached_state); |
c8b97818 CM |
1674 | *start = delalloc_start; |
1675 | *end = delalloc_end; | |
1676 | out_failed: | |
1677 | return found; | |
1678 | } | |
1679 | ||
c2790a2e JB |
1680 | int extent_clear_unlock_delalloc(struct inode *inode, u64 start, u64 end, |
1681 | struct page *locked_page, | |
1682 | unsigned long clear_bits, | |
1683 | unsigned long page_ops) | |
c8b97818 | 1684 | { |
c2790a2e | 1685 | struct extent_io_tree *tree = &BTRFS_I(inode)->io_tree; |
c8b97818 CM |
1686 | int ret; |
1687 | struct page *pages[16]; | |
1688 | unsigned long index = start >> PAGE_CACHE_SHIFT; | |
1689 | unsigned long end_index = end >> PAGE_CACHE_SHIFT; | |
1690 | unsigned long nr_pages = end_index - index + 1; | |
1691 | int i; | |
771ed689 | 1692 | |
2c64c53d | 1693 | clear_extent_bit(tree, start, end, clear_bits, 1, 0, NULL, GFP_NOFS); |
c2790a2e | 1694 | if (page_ops == 0) |
771ed689 | 1695 | return 0; |
c8b97818 | 1696 | |
d397712b | 1697 | while (nr_pages > 0) { |
c8b97818 | 1698 | ret = find_get_pages_contig(inode->i_mapping, index, |
5b050f04 CM |
1699 | min_t(unsigned long, |
1700 | nr_pages, ARRAY_SIZE(pages)), pages); | |
c8b97818 | 1701 | for (i = 0; i < ret; i++) { |
8b62b72b | 1702 | |
c2790a2e | 1703 | if (page_ops & PAGE_SET_PRIVATE2) |
8b62b72b CM |
1704 | SetPagePrivate2(pages[i]); |
1705 | ||
c8b97818 CM |
1706 | if (pages[i] == locked_page) { |
1707 | page_cache_release(pages[i]); | |
1708 | continue; | |
1709 | } | |
c2790a2e | 1710 | if (page_ops & PAGE_CLEAR_DIRTY) |
c8b97818 | 1711 | clear_page_dirty_for_io(pages[i]); |
c2790a2e | 1712 | if (page_ops & PAGE_SET_WRITEBACK) |
c8b97818 | 1713 | set_page_writeback(pages[i]); |
c2790a2e | 1714 | if (page_ops & PAGE_END_WRITEBACK) |
c8b97818 | 1715 | end_page_writeback(pages[i]); |
c2790a2e | 1716 | if (page_ops & PAGE_UNLOCK) |
771ed689 | 1717 | unlock_page(pages[i]); |
c8b97818 CM |
1718 | page_cache_release(pages[i]); |
1719 | } | |
1720 | nr_pages -= ret; | |
1721 | index += ret; | |
1722 | cond_resched(); | |
1723 | } | |
1724 | return 0; | |
1725 | } | |
c8b97818 | 1726 | |
d352ac68 CM |
1727 | /* |
1728 | * count the number of bytes in the tree that have a given bit(s) | |
1729 | * set. This can be fairly slow, except for EXTENT_DIRTY which is | |
1730 | * cached. The total number found is returned. | |
1731 | */ | |
d1310b2e CM |
1732 | u64 count_range_bits(struct extent_io_tree *tree, |
1733 | u64 *start, u64 search_end, u64 max_bytes, | |
ec29ed5b | 1734 | unsigned long bits, int contig) |
d1310b2e CM |
1735 | { |
1736 | struct rb_node *node; | |
1737 | struct extent_state *state; | |
1738 | u64 cur_start = *start; | |
1739 | u64 total_bytes = 0; | |
ec29ed5b | 1740 | u64 last = 0; |
d1310b2e CM |
1741 | int found = 0; |
1742 | ||
1743 | if (search_end <= cur_start) { | |
d1310b2e CM |
1744 | WARN_ON(1); |
1745 | return 0; | |
1746 | } | |
1747 | ||
cad321ad | 1748 | spin_lock(&tree->lock); |
d1310b2e CM |
1749 | if (cur_start == 0 && bits == EXTENT_DIRTY) { |
1750 | total_bytes = tree->dirty_bytes; | |
1751 | goto out; | |
1752 | } | |
1753 | /* | |
1754 | * this search will find all the extents that end after | |
1755 | * our range starts. | |
1756 | */ | |
80ea96b1 | 1757 | node = tree_search(tree, cur_start); |
d397712b | 1758 | if (!node) |
d1310b2e | 1759 | goto out; |
d1310b2e | 1760 | |
d397712b | 1761 | while (1) { |
d1310b2e CM |
1762 | state = rb_entry(node, struct extent_state, rb_node); |
1763 | if (state->start > search_end) | |
1764 | break; | |
ec29ed5b CM |
1765 | if (contig && found && state->start > last + 1) |
1766 | break; | |
1767 | if (state->end >= cur_start && (state->state & bits) == bits) { | |
d1310b2e CM |
1768 | total_bytes += min(search_end, state->end) + 1 - |
1769 | max(cur_start, state->start); | |
1770 | if (total_bytes >= max_bytes) | |
1771 | break; | |
1772 | if (!found) { | |
af60bed2 | 1773 | *start = max(cur_start, state->start); |
d1310b2e CM |
1774 | found = 1; |
1775 | } | |
ec29ed5b CM |
1776 | last = state->end; |
1777 | } else if (contig && found) { | |
1778 | break; | |
d1310b2e CM |
1779 | } |
1780 | node = rb_next(node); | |
1781 | if (!node) | |
1782 | break; | |
1783 | } | |
1784 | out: | |
cad321ad | 1785 | spin_unlock(&tree->lock); |
d1310b2e CM |
1786 | return total_bytes; |
1787 | } | |
b2950863 | 1788 | |
d352ac68 CM |
1789 | /* |
1790 | * set the private field for a given byte offset in the tree. If there isn't | |
1791 | * an extent_state there already, this does nothing. | |
1792 | */ | |
171170c1 | 1793 | static int set_state_private(struct extent_io_tree *tree, u64 start, u64 private) |
d1310b2e CM |
1794 | { |
1795 | struct rb_node *node; | |
1796 | struct extent_state *state; | |
1797 | int ret = 0; | |
1798 | ||
cad321ad | 1799 | spin_lock(&tree->lock); |
d1310b2e CM |
1800 | /* |
1801 | * this search will find all the extents that end after | |
1802 | * our range starts. | |
1803 | */ | |
80ea96b1 | 1804 | node = tree_search(tree, start); |
2b114d1d | 1805 | if (!node) { |
d1310b2e CM |
1806 | ret = -ENOENT; |
1807 | goto out; | |
1808 | } | |
1809 | state = rb_entry(node, struct extent_state, rb_node); | |
1810 | if (state->start != start) { | |
1811 | ret = -ENOENT; | |
1812 | goto out; | |
1813 | } | |
1814 | state->private = private; | |
1815 | out: | |
cad321ad | 1816 | spin_unlock(&tree->lock); |
d1310b2e CM |
1817 | return ret; |
1818 | } | |
1819 | ||
1820 | int get_state_private(struct extent_io_tree *tree, u64 start, u64 *private) | |
1821 | { | |
1822 | struct rb_node *node; | |
1823 | struct extent_state *state; | |
1824 | int ret = 0; | |
1825 | ||
cad321ad | 1826 | spin_lock(&tree->lock); |
d1310b2e CM |
1827 | /* |
1828 | * this search will find all the extents that end after | |
1829 | * our range starts. | |
1830 | */ | |
80ea96b1 | 1831 | node = tree_search(tree, start); |
2b114d1d | 1832 | if (!node) { |
d1310b2e CM |
1833 | ret = -ENOENT; |
1834 | goto out; | |
1835 | } | |
1836 | state = rb_entry(node, struct extent_state, rb_node); | |
1837 | if (state->start != start) { | |
1838 | ret = -ENOENT; | |
1839 | goto out; | |
1840 | } | |
1841 | *private = state->private; | |
1842 | out: | |
cad321ad | 1843 | spin_unlock(&tree->lock); |
d1310b2e CM |
1844 | return ret; |
1845 | } | |
1846 | ||
1847 | /* | |
1848 | * searches a range in the state tree for a given mask. | |
70dec807 | 1849 | * If 'filled' == 1, this returns 1 only if every extent in the tree |
d1310b2e CM |
1850 | * has the bits set. Otherwise, 1 is returned if any bit in the |
1851 | * range is found set. | |
1852 | */ | |
1853 | int test_range_bit(struct extent_io_tree *tree, u64 start, u64 end, | |
41074888 | 1854 | unsigned long bits, int filled, struct extent_state *cached) |
d1310b2e CM |
1855 | { |
1856 | struct extent_state *state = NULL; | |
1857 | struct rb_node *node; | |
1858 | int bitset = 0; | |
d1310b2e | 1859 | |
cad321ad | 1860 | spin_lock(&tree->lock); |
df98b6e2 JB |
1861 | if (cached && cached->tree && cached->start <= start && |
1862 | cached->end > start) | |
9655d298 CM |
1863 | node = &cached->rb_node; |
1864 | else | |
1865 | node = tree_search(tree, start); | |
d1310b2e CM |
1866 | while (node && start <= end) { |
1867 | state = rb_entry(node, struct extent_state, rb_node); | |
1868 | ||
1869 | if (filled && state->start > start) { | |
1870 | bitset = 0; | |
1871 | break; | |
1872 | } | |
1873 | ||
1874 | if (state->start > end) | |
1875 | break; | |
1876 | ||
1877 | if (state->state & bits) { | |
1878 | bitset = 1; | |
1879 | if (!filled) | |
1880 | break; | |
1881 | } else if (filled) { | |
1882 | bitset = 0; | |
1883 | break; | |
1884 | } | |
46562cec CM |
1885 | |
1886 | if (state->end == (u64)-1) | |
1887 | break; | |
1888 | ||
d1310b2e CM |
1889 | start = state->end + 1; |
1890 | if (start > end) | |
1891 | break; | |
1892 | node = rb_next(node); | |
1893 | if (!node) { | |
1894 | if (filled) | |
1895 | bitset = 0; | |
1896 | break; | |
1897 | } | |
1898 | } | |
cad321ad | 1899 | spin_unlock(&tree->lock); |
d1310b2e CM |
1900 | return bitset; |
1901 | } | |
d1310b2e CM |
1902 | |
1903 | /* | |
1904 | * helper function to set a given page up to date if all the | |
1905 | * extents in the tree for that page are up to date | |
1906 | */ | |
143bede5 | 1907 | static void check_page_uptodate(struct extent_io_tree *tree, struct page *page) |
d1310b2e | 1908 | { |
4eee4fa4 | 1909 | u64 start = page_offset(page); |
d1310b2e | 1910 | u64 end = start + PAGE_CACHE_SIZE - 1; |
9655d298 | 1911 | if (test_range_bit(tree, start, end, EXTENT_UPTODATE, 1, NULL)) |
d1310b2e | 1912 | SetPageUptodate(page); |
d1310b2e CM |
1913 | } |
1914 | ||
4a54c8c1 JS |
1915 | /* |
1916 | * When IO fails, either with EIO or csum verification fails, we | |
1917 | * try other mirrors that might have a good copy of the data. This | |
1918 | * io_failure_record is used to record state as we go through all the | |
1919 | * mirrors. If another mirror has good data, the page is set up to date | |
1920 | * and things continue. If a good mirror can't be found, the original | |
1921 | * bio end_io callback is called to indicate things have failed. | |
1922 | */ | |
1923 | struct io_failure_record { | |
1924 | struct page *page; | |
1925 | u64 start; | |
1926 | u64 len; | |
1927 | u64 logical; | |
1928 | unsigned long bio_flags; | |
1929 | int this_mirror; | |
1930 | int failed_mirror; | |
1931 | int in_validation; | |
1932 | }; | |
1933 | ||
1934 | static int free_io_failure(struct inode *inode, struct io_failure_record *rec, | |
1935 | int did_repair) | |
1936 | { | |
1937 | int ret; | |
1938 | int err = 0; | |
1939 | struct extent_io_tree *failure_tree = &BTRFS_I(inode)->io_failure_tree; | |
1940 | ||
1941 | set_state_private(failure_tree, rec->start, 0); | |
1942 | ret = clear_extent_bits(failure_tree, rec->start, | |
1943 | rec->start + rec->len - 1, | |
1944 | EXTENT_LOCKED | EXTENT_DIRTY, GFP_NOFS); | |
1945 | if (ret) | |
1946 | err = ret; | |
1947 | ||
53b381b3 DW |
1948 | ret = clear_extent_bits(&BTRFS_I(inode)->io_tree, rec->start, |
1949 | rec->start + rec->len - 1, | |
1950 | EXTENT_DAMAGED, GFP_NOFS); | |
1951 | if (ret && !err) | |
1952 | err = ret; | |
4a54c8c1 JS |
1953 | |
1954 | kfree(rec); | |
1955 | return err; | |
1956 | } | |
1957 | ||
1958 | static void repair_io_failure_callback(struct bio *bio, int err) | |
1959 | { | |
1960 | complete(bio->bi_private); | |
1961 | } | |
1962 | ||
1963 | /* | |
1964 | * this bypasses the standard btrfs submit functions deliberately, as | |
1965 | * the standard behavior is to write all copies in a raid setup. here we only | |
1966 | * want to write the one bad copy. so we do the mapping for ourselves and issue | |
1967 | * submit_bio directly. | |
3ec706c8 | 1968 | * to avoid any synchronization issues, wait for the data after writing, which |
4a54c8c1 JS |
1969 | * actually prevents the read that triggered the error from finishing. |
1970 | * currently, there can be no more than two copies of every data bit. thus, | |
1971 | * exactly one rewrite is required. | |
1972 | */ | |
3ec706c8 | 1973 | int repair_io_failure(struct btrfs_fs_info *fs_info, u64 start, |
4a54c8c1 JS |
1974 | u64 length, u64 logical, struct page *page, |
1975 | int mirror_num) | |
1976 | { | |
1977 | struct bio *bio; | |
1978 | struct btrfs_device *dev; | |
1979 | DECLARE_COMPLETION_ONSTACK(compl); | |
1980 | u64 map_length = 0; | |
1981 | u64 sector; | |
1982 | struct btrfs_bio *bbio = NULL; | |
53b381b3 | 1983 | struct btrfs_mapping_tree *map_tree = &fs_info->mapping_tree; |
4a54c8c1 JS |
1984 | int ret; |
1985 | ||
1986 | BUG_ON(!mirror_num); | |
1987 | ||
53b381b3 DW |
1988 | /* we can't repair anything in raid56 yet */ |
1989 | if (btrfs_is_parity_mirror(map_tree, logical, length, mirror_num)) | |
1990 | return 0; | |
1991 | ||
9be3395b | 1992 | bio = btrfs_io_bio_alloc(GFP_NOFS, 1); |
4a54c8c1 JS |
1993 | if (!bio) |
1994 | return -EIO; | |
1995 | bio->bi_private = &compl; | |
1996 | bio->bi_end_io = repair_io_failure_callback; | |
1997 | bio->bi_size = 0; | |
1998 | map_length = length; | |
1999 | ||
3ec706c8 | 2000 | ret = btrfs_map_block(fs_info, WRITE, logical, |
4a54c8c1 JS |
2001 | &map_length, &bbio, mirror_num); |
2002 | if (ret) { | |
2003 | bio_put(bio); | |
2004 | return -EIO; | |
2005 | } | |
2006 | BUG_ON(mirror_num != bbio->mirror_num); | |
2007 | sector = bbio->stripes[mirror_num-1].physical >> 9; | |
2008 | bio->bi_sector = sector; | |
2009 | dev = bbio->stripes[mirror_num-1].dev; | |
2010 | kfree(bbio); | |
2011 | if (!dev || !dev->bdev || !dev->writeable) { | |
2012 | bio_put(bio); | |
2013 | return -EIO; | |
2014 | } | |
2015 | bio->bi_bdev = dev->bdev; | |
4eee4fa4 | 2016 | bio_add_page(bio, page, length, start - page_offset(page)); |
21adbd5c | 2017 | btrfsic_submit_bio(WRITE_SYNC, bio); |
4a54c8c1 JS |
2018 | wait_for_completion(&compl); |
2019 | ||
2020 | if (!test_bit(BIO_UPTODATE, &bio->bi_flags)) { | |
2021 | /* try to remap that extent elsewhere? */ | |
2022 | bio_put(bio); | |
442a4f63 | 2023 | btrfs_dev_stat_inc_and_print(dev, BTRFS_DEV_STAT_WRITE_ERRS); |
4a54c8c1 JS |
2024 | return -EIO; |
2025 | } | |
2026 | ||
d5b025d5 | 2027 | printk_ratelimited_in_rcu(KERN_INFO "btrfs read error corrected: ino %lu off %llu " |
606686ee JB |
2028 | "(dev %s sector %llu)\n", page->mapping->host->i_ino, |
2029 | start, rcu_str_deref(dev->name), sector); | |
4a54c8c1 JS |
2030 | |
2031 | bio_put(bio); | |
2032 | return 0; | |
2033 | } | |
2034 | ||
ea466794 JB |
2035 | int repair_eb_io_failure(struct btrfs_root *root, struct extent_buffer *eb, |
2036 | int mirror_num) | |
2037 | { | |
ea466794 JB |
2038 | u64 start = eb->start; |
2039 | unsigned long i, num_pages = num_extent_pages(eb->start, eb->len); | |
d95603b2 | 2040 | int ret = 0; |
ea466794 JB |
2041 | |
2042 | for (i = 0; i < num_pages; i++) { | |
2043 | struct page *p = extent_buffer_page(eb, i); | |
3ec706c8 | 2044 | ret = repair_io_failure(root->fs_info, start, PAGE_CACHE_SIZE, |
ea466794 JB |
2045 | start, p, mirror_num); |
2046 | if (ret) | |
2047 | break; | |
2048 | start += PAGE_CACHE_SIZE; | |
2049 | } | |
2050 | ||
2051 | return ret; | |
2052 | } | |
2053 | ||
4a54c8c1 JS |
2054 | /* |
2055 | * each time an IO finishes, we do a fast check in the IO failure tree | |
2056 | * to see if we need to process or clean up an io_failure_record | |
2057 | */ | |
2058 | static int clean_io_failure(u64 start, struct page *page) | |
2059 | { | |
2060 | u64 private; | |
2061 | u64 private_failure; | |
2062 | struct io_failure_record *failrec; | |
3ec706c8 | 2063 | struct btrfs_fs_info *fs_info; |
4a54c8c1 JS |
2064 | struct extent_state *state; |
2065 | int num_copies; | |
2066 | int did_repair = 0; | |
2067 | int ret; | |
2068 | struct inode *inode = page->mapping->host; | |
2069 | ||
2070 | private = 0; | |
2071 | ret = count_range_bits(&BTRFS_I(inode)->io_failure_tree, &private, | |
2072 | (u64)-1, 1, EXTENT_DIRTY, 0); | |
2073 | if (!ret) | |
2074 | return 0; | |
2075 | ||
2076 | ret = get_state_private(&BTRFS_I(inode)->io_failure_tree, start, | |
2077 | &private_failure); | |
2078 | if (ret) | |
2079 | return 0; | |
2080 | ||
2081 | failrec = (struct io_failure_record *)(unsigned long) private_failure; | |
2082 | BUG_ON(!failrec->this_mirror); | |
2083 | ||
2084 | if (failrec->in_validation) { | |
2085 | /* there was no real error, just free the record */ | |
2086 | pr_debug("clean_io_failure: freeing dummy error at %llu\n", | |
2087 | failrec->start); | |
2088 | did_repair = 1; | |
2089 | goto out; | |
2090 | } | |
2091 | ||
2092 | spin_lock(&BTRFS_I(inode)->io_tree.lock); | |
2093 | state = find_first_extent_bit_state(&BTRFS_I(inode)->io_tree, | |
2094 | failrec->start, | |
2095 | EXTENT_LOCKED); | |
2096 | spin_unlock(&BTRFS_I(inode)->io_tree.lock); | |
2097 | ||
883d0de4 MX |
2098 | if (state && state->start <= failrec->start && |
2099 | state->end >= failrec->start + failrec->len - 1) { | |
3ec706c8 SB |
2100 | fs_info = BTRFS_I(inode)->root->fs_info; |
2101 | num_copies = btrfs_num_copies(fs_info, failrec->logical, | |
2102 | failrec->len); | |
4a54c8c1 | 2103 | if (num_copies > 1) { |
3ec706c8 | 2104 | ret = repair_io_failure(fs_info, start, failrec->len, |
4a54c8c1 JS |
2105 | failrec->logical, page, |
2106 | failrec->failed_mirror); | |
2107 | did_repair = !ret; | |
2108 | } | |
53b381b3 | 2109 | ret = 0; |
4a54c8c1 JS |
2110 | } |
2111 | ||
2112 | out: | |
2113 | if (!ret) | |
2114 | ret = free_io_failure(inode, failrec, did_repair); | |
2115 | ||
2116 | return ret; | |
2117 | } | |
2118 | ||
2119 | /* | |
2120 | * this is a generic handler for readpage errors (default | |
2121 | * readpage_io_failed_hook). if other copies exist, read those and write back | |
2122 | * good data to the failed position. does not investigate in remapping the | |
2123 | * failed extent elsewhere, hoping the device will be smart enough to do this as | |
2124 | * needed | |
2125 | */ | |
2126 | ||
facc8a22 MX |
2127 | static int bio_readpage_error(struct bio *failed_bio, u64 phy_offset, |
2128 | struct page *page, u64 start, u64 end, | |
2129 | int failed_mirror) | |
4a54c8c1 JS |
2130 | { |
2131 | struct io_failure_record *failrec = NULL; | |
2132 | u64 private; | |
2133 | struct extent_map *em; | |
2134 | struct inode *inode = page->mapping->host; | |
2135 | struct extent_io_tree *failure_tree = &BTRFS_I(inode)->io_failure_tree; | |
2136 | struct extent_io_tree *tree = &BTRFS_I(inode)->io_tree; | |
2137 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; | |
2138 | struct bio *bio; | |
facc8a22 MX |
2139 | struct btrfs_io_bio *btrfs_failed_bio; |
2140 | struct btrfs_io_bio *btrfs_bio; | |
4a54c8c1 JS |
2141 | int num_copies; |
2142 | int ret; | |
2143 | int read_mode; | |
2144 | u64 logical; | |
2145 | ||
2146 | BUG_ON(failed_bio->bi_rw & REQ_WRITE); | |
2147 | ||
2148 | ret = get_state_private(failure_tree, start, &private); | |
2149 | if (ret) { | |
2150 | failrec = kzalloc(sizeof(*failrec), GFP_NOFS); | |
2151 | if (!failrec) | |
2152 | return -ENOMEM; | |
2153 | failrec->start = start; | |
2154 | failrec->len = end - start + 1; | |
2155 | failrec->this_mirror = 0; | |
2156 | failrec->bio_flags = 0; | |
2157 | failrec->in_validation = 0; | |
2158 | ||
2159 | read_lock(&em_tree->lock); | |
2160 | em = lookup_extent_mapping(em_tree, start, failrec->len); | |
2161 | if (!em) { | |
2162 | read_unlock(&em_tree->lock); | |
2163 | kfree(failrec); | |
2164 | return -EIO; | |
2165 | } | |
2166 | ||
2167 | if (em->start > start || em->start + em->len < start) { | |
2168 | free_extent_map(em); | |
2169 | em = NULL; | |
2170 | } | |
2171 | read_unlock(&em_tree->lock); | |
2172 | ||
7a2d6a64 | 2173 | if (!em) { |
4a54c8c1 JS |
2174 | kfree(failrec); |
2175 | return -EIO; | |
2176 | } | |
2177 | logical = start - em->start; | |
2178 | logical = em->block_start + logical; | |
2179 | if (test_bit(EXTENT_FLAG_COMPRESSED, &em->flags)) { | |
2180 | logical = em->block_start; | |
2181 | failrec->bio_flags = EXTENT_BIO_COMPRESSED; | |
2182 | extent_set_compress_type(&failrec->bio_flags, | |
2183 | em->compress_type); | |
2184 | } | |
2185 | pr_debug("bio_readpage_error: (new) logical=%llu, start=%llu, " | |
2186 | "len=%llu\n", logical, start, failrec->len); | |
2187 | failrec->logical = logical; | |
2188 | free_extent_map(em); | |
2189 | ||
2190 | /* set the bits in the private failure tree */ | |
2191 | ret = set_extent_bits(failure_tree, start, end, | |
2192 | EXTENT_LOCKED | EXTENT_DIRTY, GFP_NOFS); | |
2193 | if (ret >= 0) | |
2194 | ret = set_state_private(failure_tree, start, | |
2195 | (u64)(unsigned long)failrec); | |
2196 | /* set the bits in the inode's tree */ | |
2197 | if (ret >= 0) | |
2198 | ret = set_extent_bits(tree, start, end, EXTENT_DAMAGED, | |
2199 | GFP_NOFS); | |
2200 | if (ret < 0) { | |
2201 | kfree(failrec); | |
2202 | return ret; | |
2203 | } | |
2204 | } else { | |
2205 | failrec = (struct io_failure_record *)(unsigned long)private; | |
2206 | pr_debug("bio_readpage_error: (found) logical=%llu, " | |
2207 | "start=%llu, len=%llu, validation=%d\n", | |
2208 | failrec->logical, failrec->start, failrec->len, | |
2209 | failrec->in_validation); | |
2210 | /* | |
2211 | * when data can be on disk more than twice, add to failrec here | |
2212 | * (e.g. with a list for failed_mirror) to make | |
2213 | * clean_io_failure() clean all those errors at once. | |
2214 | */ | |
2215 | } | |
5d964051 SB |
2216 | num_copies = btrfs_num_copies(BTRFS_I(inode)->root->fs_info, |
2217 | failrec->logical, failrec->len); | |
4a54c8c1 JS |
2218 | if (num_copies == 1) { |
2219 | /* | |
2220 | * we only have a single copy of the data, so don't bother with | |
2221 | * all the retry and error correction code that follows. no | |
2222 | * matter what the error is, it is very likely to persist. | |
2223 | */ | |
09a7f7a2 MX |
2224 | pr_debug("bio_readpage_error: cannot repair, num_copies=%d, next_mirror %d, failed_mirror %d\n", |
2225 | num_copies, failrec->this_mirror, failed_mirror); | |
4a54c8c1 JS |
2226 | free_io_failure(inode, failrec, 0); |
2227 | return -EIO; | |
2228 | } | |
2229 | ||
4a54c8c1 JS |
2230 | /* |
2231 | * there are two premises: | |
2232 | * a) deliver good data to the caller | |
2233 | * b) correct the bad sectors on disk | |
2234 | */ | |
2235 | if (failed_bio->bi_vcnt > 1) { | |
2236 | /* | |
2237 | * to fulfill b), we need to know the exact failing sectors, as | |
2238 | * we don't want to rewrite any more than the failed ones. thus, | |
2239 | * we need separate read requests for the failed bio | |
2240 | * | |
2241 | * if the following BUG_ON triggers, our validation request got | |
2242 | * merged. we need separate requests for our algorithm to work. | |
2243 | */ | |
2244 | BUG_ON(failrec->in_validation); | |
2245 | failrec->in_validation = 1; | |
2246 | failrec->this_mirror = failed_mirror; | |
2247 | read_mode = READ_SYNC | REQ_FAILFAST_DEV; | |
2248 | } else { | |
2249 | /* | |
2250 | * we're ready to fulfill a) and b) alongside. get a good copy | |
2251 | * of the failed sector and if we succeed, we have setup | |
2252 | * everything for repair_io_failure to do the rest for us. | |
2253 | */ | |
2254 | if (failrec->in_validation) { | |
2255 | BUG_ON(failrec->this_mirror != failed_mirror); | |
2256 | failrec->in_validation = 0; | |
2257 | failrec->this_mirror = 0; | |
2258 | } | |
2259 | failrec->failed_mirror = failed_mirror; | |
2260 | failrec->this_mirror++; | |
2261 | if (failrec->this_mirror == failed_mirror) | |
2262 | failrec->this_mirror++; | |
2263 | read_mode = READ_SYNC; | |
2264 | } | |
2265 | ||
facc8a22 MX |
2266 | if (failrec->this_mirror > num_copies) { |
2267 | pr_debug("bio_readpage_error: (fail) num_copies=%d, next_mirror %d, failed_mirror %d\n", | |
4a54c8c1 JS |
2268 | num_copies, failrec->this_mirror, failed_mirror); |
2269 | free_io_failure(inode, failrec, 0); | |
2270 | return -EIO; | |
2271 | } | |
2272 | ||
9be3395b | 2273 | bio = btrfs_io_bio_alloc(GFP_NOFS, 1); |
e627ee7b TI |
2274 | if (!bio) { |
2275 | free_io_failure(inode, failrec, 0); | |
2276 | return -EIO; | |
2277 | } | |
4a54c8c1 JS |
2278 | bio->bi_end_io = failed_bio->bi_end_io; |
2279 | bio->bi_sector = failrec->logical >> 9; | |
2280 | bio->bi_bdev = BTRFS_I(inode)->root->fs_info->fs_devices->latest_bdev; | |
2281 | bio->bi_size = 0; | |
2282 | ||
facc8a22 MX |
2283 | btrfs_failed_bio = btrfs_io_bio(failed_bio); |
2284 | if (btrfs_failed_bio->csum) { | |
2285 | struct btrfs_fs_info *fs_info = BTRFS_I(inode)->root->fs_info; | |
2286 | u16 csum_size = btrfs_super_csum_size(fs_info->super_copy); | |
2287 | ||
2288 | btrfs_bio = btrfs_io_bio(bio); | |
2289 | btrfs_bio->csum = btrfs_bio->csum_inline; | |
2290 | phy_offset >>= inode->i_sb->s_blocksize_bits; | |
2291 | phy_offset *= csum_size; | |
2292 | memcpy(btrfs_bio->csum, btrfs_failed_bio->csum + phy_offset, | |
2293 | csum_size); | |
2294 | } | |
2295 | ||
4a54c8c1 JS |
2296 | bio_add_page(bio, page, failrec->len, start - page_offset(page)); |
2297 | ||
2298 | pr_debug("bio_readpage_error: submitting new read[%#x] to " | |
2299 | "this_mirror=%d, num_copies=%d, in_validation=%d\n", read_mode, | |
2300 | failrec->this_mirror, num_copies, failrec->in_validation); | |
2301 | ||
013bd4c3 TI |
2302 | ret = tree->ops->submit_bio_hook(inode, read_mode, bio, |
2303 | failrec->this_mirror, | |
2304 | failrec->bio_flags, 0); | |
2305 | return ret; | |
4a54c8c1 JS |
2306 | } |
2307 | ||
d1310b2e CM |
2308 | /* lots and lots of room for performance fixes in the end_bio funcs */ |
2309 | ||
87826df0 JM |
2310 | int end_extent_writepage(struct page *page, int err, u64 start, u64 end) |
2311 | { | |
2312 | int uptodate = (err == 0); | |
2313 | struct extent_io_tree *tree; | |
2314 | int ret; | |
2315 | ||
2316 | tree = &BTRFS_I(page->mapping->host)->io_tree; | |
2317 | ||
2318 | if (tree->ops && tree->ops->writepage_end_io_hook) { | |
2319 | ret = tree->ops->writepage_end_io_hook(page, start, | |
2320 | end, NULL, uptodate); | |
2321 | if (ret) | |
2322 | uptodate = 0; | |
2323 | } | |
2324 | ||
87826df0 | 2325 | if (!uptodate) { |
87826df0 JM |
2326 | ClearPageUptodate(page); |
2327 | SetPageError(page); | |
2328 | } | |
2329 | return 0; | |
2330 | } | |
2331 | ||
d1310b2e CM |
2332 | /* |
2333 | * after a writepage IO is done, we need to: | |
2334 | * clear the uptodate bits on error | |
2335 | * clear the writeback bits in the extent tree for this IO | |
2336 | * end_page_writeback if the page has no more pending IO | |
2337 | * | |
2338 | * Scheduling is not allowed, so the extent state tree is expected | |
2339 | * to have one and only one object corresponding to this IO. | |
2340 | */ | |
d1310b2e | 2341 | static void end_bio_extent_writepage(struct bio *bio, int err) |
d1310b2e | 2342 | { |
d1310b2e | 2343 | struct bio_vec *bvec = bio->bi_io_vec + bio->bi_vcnt - 1; |
902b22f3 | 2344 | struct extent_io_tree *tree; |
d1310b2e CM |
2345 | u64 start; |
2346 | u64 end; | |
d1310b2e | 2347 | |
d1310b2e CM |
2348 | do { |
2349 | struct page *page = bvec->bv_page; | |
902b22f3 DW |
2350 | tree = &BTRFS_I(page->mapping->host)->io_tree; |
2351 | ||
17a5adcc AO |
2352 | /* We always issue full-page reads, but if some block |
2353 | * in a page fails to read, blk_update_request() will | |
2354 | * advance bv_offset and adjust bv_len to compensate. | |
2355 | * Print a warning for nonzero offsets, and an error | |
2356 | * if they don't add up to a full page. */ | |
2357 | if (bvec->bv_offset || bvec->bv_len != PAGE_CACHE_SIZE) | |
2358 | printk("%s page write in btrfs with offset %u and length %u\n", | |
2359 | bvec->bv_offset + bvec->bv_len != PAGE_CACHE_SIZE | |
2360 | ? KERN_ERR "partial" : KERN_INFO "incomplete", | |
2361 | bvec->bv_offset, bvec->bv_len); | |
d1310b2e | 2362 | |
17a5adcc AO |
2363 | start = page_offset(page); |
2364 | end = start + bvec->bv_offset + bvec->bv_len - 1; | |
d1310b2e CM |
2365 | |
2366 | if (--bvec >= bio->bi_io_vec) | |
2367 | prefetchw(&bvec->bv_page->flags); | |
1259ab75 | 2368 | |
87826df0 JM |
2369 | if (end_extent_writepage(page, err, start, end)) |
2370 | continue; | |
70dec807 | 2371 | |
17a5adcc | 2372 | end_page_writeback(page); |
d1310b2e | 2373 | } while (bvec >= bio->bi_io_vec); |
2b1f55b0 | 2374 | |
d1310b2e | 2375 | bio_put(bio); |
d1310b2e CM |
2376 | } |
2377 | ||
883d0de4 MX |
2378 | static void |
2379 | endio_readpage_release_extent(struct extent_io_tree *tree, u64 start, u64 len, | |
2380 | int uptodate) | |
2381 | { | |
2382 | struct extent_state *cached = NULL; | |
2383 | u64 end = start + len - 1; | |
2384 | ||
2385 | if (uptodate && tree->track_uptodate) | |
2386 | set_extent_uptodate(tree, start, end, &cached, GFP_ATOMIC); | |
2387 | unlock_extent_cached(tree, start, end, &cached, GFP_ATOMIC); | |
2388 | } | |
2389 | ||
d1310b2e CM |
2390 | /* |
2391 | * after a readpage IO is done, we need to: | |
2392 | * clear the uptodate bits on error | |
2393 | * set the uptodate bits if things worked | |
2394 | * set the page up to date if all extents in the tree are uptodate | |
2395 | * clear the lock bit in the extent tree | |
2396 | * unlock the page if there are no other extents locked for it | |
2397 | * | |
2398 | * Scheduling is not allowed, so the extent state tree is expected | |
2399 | * to have one and only one object corresponding to this IO. | |
2400 | */ | |
d1310b2e | 2401 | static void end_bio_extent_readpage(struct bio *bio, int err) |
d1310b2e CM |
2402 | { |
2403 | int uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags); | |
4125bf76 CM |
2404 | struct bio_vec *bvec_end = bio->bi_io_vec + bio->bi_vcnt - 1; |
2405 | struct bio_vec *bvec = bio->bi_io_vec; | |
facc8a22 | 2406 | struct btrfs_io_bio *io_bio = btrfs_io_bio(bio); |
902b22f3 | 2407 | struct extent_io_tree *tree; |
facc8a22 | 2408 | u64 offset = 0; |
d1310b2e CM |
2409 | u64 start; |
2410 | u64 end; | |
facc8a22 | 2411 | u64 len; |
883d0de4 MX |
2412 | u64 extent_start = 0; |
2413 | u64 extent_len = 0; | |
5cf1ab56 | 2414 | int mirror; |
d1310b2e CM |
2415 | int ret; |
2416 | ||
d20f7043 CM |
2417 | if (err) |
2418 | uptodate = 0; | |
2419 | ||
d1310b2e CM |
2420 | do { |
2421 | struct page *page = bvec->bv_page; | |
a71754fc | 2422 | struct inode *inode = page->mapping->host; |
507903b8 | 2423 | |
be3940c0 | 2424 | pr_debug("end_bio_extent_readpage: bi_sector=%llu, err=%d, " |
9be3395b CM |
2425 | "mirror=%lu\n", (u64)bio->bi_sector, err, |
2426 | io_bio->mirror_num); | |
a71754fc | 2427 | tree = &BTRFS_I(inode)->io_tree; |
902b22f3 | 2428 | |
17a5adcc AO |
2429 | /* We always issue full-page reads, but if some block |
2430 | * in a page fails to read, blk_update_request() will | |
2431 | * advance bv_offset and adjust bv_len to compensate. | |
2432 | * Print a warning for nonzero offsets, and an error | |
2433 | * if they don't add up to a full page. */ | |
2434 | if (bvec->bv_offset || bvec->bv_len != PAGE_CACHE_SIZE) | |
2435 | printk("%s page read in btrfs with offset %u and length %u\n", | |
2436 | bvec->bv_offset + bvec->bv_len != PAGE_CACHE_SIZE | |
2437 | ? KERN_ERR "partial" : KERN_INFO "incomplete", | |
2438 | bvec->bv_offset, bvec->bv_len); | |
d1310b2e | 2439 | |
17a5adcc AO |
2440 | start = page_offset(page); |
2441 | end = start + bvec->bv_offset + bvec->bv_len - 1; | |
facc8a22 | 2442 | len = bvec->bv_len; |
d1310b2e | 2443 | |
4125bf76 | 2444 | if (++bvec <= bvec_end) |
d1310b2e CM |
2445 | prefetchw(&bvec->bv_page->flags); |
2446 | ||
9be3395b | 2447 | mirror = io_bio->mirror_num; |
f2a09da9 MX |
2448 | if (likely(uptodate && tree->ops && |
2449 | tree->ops->readpage_end_io_hook)) { | |
facc8a22 MX |
2450 | ret = tree->ops->readpage_end_io_hook(io_bio, offset, |
2451 | page, start, end, | |
2452 | mirror); | |
5ee0844d | 2453 | if (ret) |
d1310b2e | 2454 | uptodate = 0; |
5ee0844d | 2455 | else |
4a54c8c1 | 2456 | clean_io_failure(start, page); |
d1310b2e | 2457 | } |
ea466794 | 2458 | |
f2a09da9 MX |
2459 | if (likely(uptodate)) |
2460 | goto readpage_ok; | |
2461 | ||
2462 | if (tree->ops && tree->ops->readpage_io_failed_hook) { | |
5cf1ab56 | 2463 | ret = tree->ops->readpage_io_failed_hook(page, mirror); |
ea466794 JB |
2464 | if (!ret && !err && |
2465 | test_bit(BIO_UPTODATE, &bio->bi_flags)) | |
2466 | uptodate = 1; | |
f2a09da9 | 2467 | } else { |
f4a8e656 JS |
2468 | /* |
2469 | * The generic bio_readpage_error handles errors the | |
2470 | * following way: If possible, new read requests are | |
2471 | * created and submitted and will end up in | |
2472 | * end_bio_extent_readpage as well (if we're lucky, not | |
2473 | * in the !uptodate case). In that case it returns 0 and | |
2474 | * we just go on with the next page in our bio. If it | |
2475 | * can't handle the error it will return -EIO and we | |
2476 | * remain responsible for that page. | |
2477 | */ | |
facc8a22 MX |
2478 | ret = bio_readpage_error(bio, offset, page, start, end, |
2479 | mirror); | |
7e38326f | 2480 | if (ret == 0) { |
3b951516 CM |
2481 | uptodate = |
2482 | test_bit(BIO_UPTODATE, &bio->bi_flags); | |
d20f7043 CM |
2483 | if (err) |
2484 | uptodate = 0; | |
7e38326f CM |
2485 | continue; |
2486 | } | |
2487 | } | |
f2a09da9 | 2488 | readpage_ok: |
883d0de4 | 2489 | if (likely(uptodate)) { |
a71754fc JB |
2490 | loff_t i_size = i_size_read(inode); |
2491 | pgoff_t end_index = i_size >> PAGE_CACHE_SHIFT; | |
2492 | unsigned offset; | |
2493 | ||
2494 | /* Zero out the end if this page straddles i_size */ | |
2495 | offset = i_size & (PAGE_CACHE_SIZE-1); | |
2496 | if (page->index == end_index && offset) | |
2497 | zero_user_segment(page, offset, PAGE_CACHE_SIZE); | |
17a5adcc | 2498 | SetPageUptodate(page); |
70dec807 | 2499 | } else { |
17a5adcc AO |
2500 | ClearPageUptodate(page); |
2501 | SetPageError(page); | |
70dec807 | 2502 | } |
17a5adcc | 2503 | unlock_page(page); |
facc8a22 | 2504 | offset += len; |
883d0de4 MX |
2505 | |
2506 | if (unlikely(!uptodate)) { | |
2507 | if (extent_len) { | |
2508 | endio_readpage_release_extent(tree, | |
2509 | extent_start, | |
2510 | extent_len, 1); | |
2511 | extent_start = 0; | |
2512 | extent_len = 0; | |
2513 | } | |
2514 | endio_readpage_release_extent(tree, start, | |
2515 | end - start + 1, 0); | |
2516 | } else if (!extent_len) { | |
2517 | extent_start = start; | |
2518 | extent_len = end + 1 - start; | |
2519 | } else if (extent_start + extent_len == start) { | |
2520 | extent_len += end + 1 - start; | |
2521 | } else { | |
2522 | endio_readpage_release_extent(tree, extent_start, | |
2523 | extent_len, uptodate); | |
2524 | extent_start = start; | |
2525 | extent_len = end + 1 - start; | |
2526 | } | |
4125bf76 | 2527 | } while (bvec <= bvec_end); |
d1310b2e | 2528 | |
883d0de4 MX |
2529 | if (extent_len) |
2530 | endio_readpage_release_extent(tree, extent_start, extent_len, | |
2531 | uptodate); | |
facc8a22 MX |
2532 | if (io_bio->end_io) |
2533 | io_bio->end_io(io_bio, err); | |
d1310b2e | 2534 | bio_put(bio); |
d1310b2e CM |
2535 | } |
2536 | ||
9be3395b CM |
2537 | /* |
2538 | * this allocates from the btrfs_bioset. We're returning a bio right now | |
2539 | * but you can call btrfs_io_bio for the appropriate container_of magic | |
2540 | */ | |
88f794ed MX |
2541 | struct bio * |
2542 | btrfs_bio_alloc(struct block_device *bdev, u64 first_sector, int nr_vecs, | |
2543 | gfp_t gfp_flags) | |
d1310b2e | 2544 | { |
facc8a22 | 2545 | struct btrfs_io_bio *btrfs_bio; |
d1310b2e CM |
2546 | struct bio *bio; |
2547 | ||
9be3395b | 2548 | bio = bio_alloc_bioset(gfp_flags, nr_vecs, btrfs_bioset); |
d1310b2e CM |
2549 | |
2550 | if (bio == NULL && (current->flags & PF_MEMALLOC)) { | |
9be3395b CM |
2551 | while (!bio && (nr_vecs /= 2)) { |
2552 | bio = bio_alloc_bioset(gfp_flags, | |
2553 | nr_vecs, btrfs_bioset); | |
2554 | } | |
d1310b2e CM |
2555 | } |
2556 | ||
2557 | if (bio) { | |
e1c4b745 | 2558 | bio->bi_size = 0; |
d1310b2e CM |
2559 | bio->bi_bdev = bdev; |
2560 | bio->bi_sector = first_sector; | |
facc8a22 MX |
2561 | btrfs_bio = btrfs_io_bio(bio); |
2562 | btrfs_bio->csum = NULL; | |
2563 | btrfs_bio->csum_allocated = NULL; | |
2564 | btrfs_bio->end_io = NULL; | |
d1310b2e CM |
2565 | } |
2566 | return bio; | |
2567 | } | |
2568 | ||
9be3395b CM |
2569 | struct bio *btrfs_bio_clone(struct bio *bio, gfp_t gfp_mask) |
2570 | { | |
2571 | return bio_clone_bioset(bio, gfp_mask, btrfs_bioset); | |
2572 | } | |
2573 | ||
2574 | ||
2575 | /* this also allocates from the btrfs_bioset */ | |
2576 | struct bio *btrfs_io_bio_alloc(gfp_t gfp_mask, unsigned int nr_iovecs) | |
2577 | { | |
facc8a22 MX |
2578 | struct btrfs_io_bio *btrfs_bio; |
2579 | struct bio *bio; | |
2580 | ||
2581 | bio = bio_alloc_bioset(gfp_mask, nr_iovecs, btrfs_bioset); | |
2582 | if (bio) { | |
2583 | btrfs_bio = btrfs_io_bio(bio); | |
2584 | btrfs_bio->csum = NULL; | |
2585 | btrfs_bio->csum_allocated = NULL; | |
2586 | btrfs_bio->end_io = NULL; | |
2587 | } | |
2588 | return bio; | |
9be3395b CM |
2589 | } |
2590 | ||
2591 | ||
355808c2 JM |
2592 | static int __must_check submit_one_bio(int rw, struct bio *bio, |
2593 | int mirror_num, unsigned long bio_flags) | |
d1310b2e | 2594 | { |
d1310b2e | 2595 | int ret = 0; |
70dec807 CM |
2596 | struct bio_vec *bvec = bio->bi_io_vec + bio->bi_vcnt - 1; |
2597 | struct page *page = bvec->bv_page; | |
2598 | struct extent_io_tree *tree = bio->bi_private; | |
70dec807 | 2599 | u64 start; |
70dec807 | 2600 | |
4eee4fa4 | 2601 | start = page_offset(page) + bvec->bv_offset; |
70dec807 | 2602 | |
902b22f3 | 2603 | bio->bi_private = NULL; |
d1310b2e CM |
2604 | |
2605 | bio_get(bio); | |
2606 | ||
065631f6 | 2607 | if (tree->ops && tree->ops->submit_bio_hook) |
6b82ce8d | 2608 | ret = tree->ops->submit_bio_hook(page->mapping->host, rw, bio, |
eaf25d93 | 2609 | mirror_num, bio_flags, start); |
0b86a832 | 2610 | else |
21adbd5c | 2611 | btrfsic_submit_bio(rw, bio); |
4a54c8c1 | 2612 | |
d1310b2e CM |
2613 | if (bio_flagged(bio, BIO_EOPNOTSUPP)) |
2614 | ret = -EOPNOTSUPP; | |
2615 | bio_put(bio); | |
2616 | return ret; | |
2617 | } | |
2618 | ||
64a16701 | 2619 | static int merge_bio(int rw, struct extent_io_tree *tree, struct page *page, |
3444a972 JM |
2620 | unsigned long offset, size_t size, struct bio *bio, |
2621 | unsigned long bio_flags) | |
2622 | { | |
2623 | int ret = 0; | |
2624 | if (tree->ops && tree->ops->merge_bio_hook) | |
64a16701 | 2625 | ret = tree->ops->merge_bio_hook(rw, page, offset, size, bio, |
3444a972 JM |
2626 | bio_flags); |
2627 | BUG_ON(ret < 0); | |
2628 | return ret; | |
2629 | ||
2630 | } | |
2631 | ||
d1310b2e CM |
2632 | static int submit_extent_page(int rw, struct extent_io_tree *tree, |
2633 | struct page *page, sector_t sector, | |
2634 | size_t size, unsigned long offset, | |
2635 | struct block_device *bdev, | |
2636 | struct bio **bio_ret, | |
2637 | unsigned long max_pages, | |
f188591e | 2638 | bio_end_io_t end_io_func, |
c8b97818 CM |
2639 | int mirror_num, |
2640 | unsigned long prev_bio_flags, | |
2641 | unsigned long bio_flags) | |
d1310b2e CM |
2642 | { |
2643 | int ret = 0; | |
2644 | struct bio *bio; | |
2645 | int nr; | |
c8b97818 CM |
2646 | int contig = 0; |
2647 | int this_compressed = bio_flags & EXTENT_BIO_COMPRESSED; | |
2648 | int old_compressed = prev_bio_flags & EXTENT_BIO_COMPRESSED; | |
5b050f04 | 2649 | size_t page_size = min_t(size_t, size, PAGE_CACHE_SIZE); |
d1310b2e CM |
2650 | |
2651 | if (bio_ret && *bio_ret) { | |
2652 | bio = *bio_ret; | |
c8b97818 CM |
2653 | if (old_compressed) |
2654 | contig = bio->bi_sector == sector; | |
2655 | else | |
f73a1c7d | 2656 | contig = bio_end_sector(bio) == sector; |
c8b97818 CM |
2657 | |
2658 | if (prev_bio_flags != bio_flags || !contig || | |
64a16701 | 2659 | merge_bio(rw, tree, page, offset, page_size, bio, bio_flags) || |
c8b97818 CM |
2660 | bio_add_page(bio, page, page_size, offset) < page_size) { |
2661 | ret = submit_one_bio(rw, bio, mirror_num, | |
2662 | prev_bio_flags); | |
79787eaa JM |
2663 | if (ret < 0) |
2664 | return ret; | |
d1310b2e CM |
2665 | bio = NULL; |
2666 | } else { | |
2667 | return 0; | |
2668 | } | |
2669 | } | |
c8b97818 CM |
2670 | if (this_compressed) |
2671 | nr = BIO_MAX_PAGES; | |
2672 | else | |
2673 | nr = bio_get_nr_vecs(bdev); | |
2674 | ||
88f794ed | 2675 | bio = btrfs_bio_alloc(bdev, sector, nr, GFP_NOFS | __GFP_HIGH); |
5df67083 TI |
2676 | if (!bio) |
2677 | return -ENOMEM; | |
70dec807 | 2678 | |
c8b97818 | 2679 | bio_add_page(bio, page, page_size, offset); |
d1310b2e CM |
2680 | bio->bi_end_io = end_io_func; |
2681 | bio->bi_private = tree; | |
70dec807 | 2682 | |
d397712b | 2683 | if (bio_ret) |
d1310b2e | 2684 | *bio_ret = bio; |
d397712b | 2685 | else |
c8b97818 | 2686 | ret = submit_one_bio(rw, bio, mirror_num, bio_flags); |
d1310b2e CM |
2687 | |
2688 | return ret; | |
2689 | } | |
2690 | ||
48a3b636 ES |
2691 | static void attach_extent_buffer_page(struct extent_buffer *eb, |
2692 | struct page *page) | |
d1310b2e CM |
2693 | { |
2694 | if (!PagePrivate(page)) { | |
2695 | SetPagePrivate(page); | |
d1310b2e | 2696 | page_cache_get(page); |
4f2de97a JB |
2697 | set_page_private(page, (unsigned long)eb); |
2698 | } else { | |
2699 | WARN_ON(page->private != (unsigned long)eb); | |
d1310b2e CM |
2700 | } |
2701 | } | |
2702 | ||
4f2de97a | 2703 | void set_page_extent_mapped(struct page *page) |
d1310b2e | 2704 | { |
4f2de97a JB |
2705 | if (!PagePrivate(page)) { |
2706 | SetPagePrivate(page); | |
2707 | page_cache_get(page); | |
2708 | set_page_private(page, EXTENT_PAGE_PRIVATE); | |
2709 | } | |
d1310b2e CM |
2710 | } |
2711 | ||
125bac01 MX |
2712 | static struct extent_map * |
2713 | __get_extent_map(struct inode *inode, struct page *page, size_t pg_offset, | |
2714 | u64 start, u64 len, get_extent_t *get_extent, | |
2715 | struct extent_map **em_cached) | |
2716 | { | |
2717 | struct extent_map *em; | |
2718 | ||
2719 | if (em_cached && *em_cached) { | |
2720 | em = *em_cached; | |
2721 | if (em->in_tree && start >= em->start && | |
2722 | start < extent_map_end(em)) { | |
2723 | atomic_inc(&em->refs); | |
2724 | return em; | |
2725 | } | |
2726 | ||
2727 | free_extent_map(em); | |
2728 | *em_cached = NULL; | |
2729 | } | |
2730 | ||
2731 | em = get_extent(inode, page, pg_offset, start, len, 0); | |
2732 | if (em_cached && !IS_ERR_OR_NULL(em)) { | |
2733 | BUG_ON(*em_cached); | |
2734 | atomic_inc(&em->refs); | |
2735 | *em_cached = em; | |
2736 | } | |
2737 | return em; | |
2738 | } | |
d1310b2e CM |
2739 | /* |
2740 | * basic readpage implementation. Locked extent state structs are inserted | |
2741 | * into the tree that are removed when the IO is done (by the end_io | |
2742 | * handlers) | |
79787eaa | 2743 | * XXX JDM: This needs looking at to ensure proper page locking |
d1310b2e | 2744 | */ |
9974090b MX |
2745 | static int __do_readpage(struct extent_io_tree *tree, |
2746 | struct page *page, | |
2747 | get_extent_t *get_extent, | |
125bac01 | 2748 | struct extent_map **em_cached, |
9974090b MX |
2749 | struct bio **bio, int mirror_num, |
2750 | unsigned long *bio_flags, int rw) | |
d1310b2e CM |
2751 | { |
2752 | struct inode *inode = page->mapping->host; | |
4eee4fa4 | 2753 | u64 start = page_offset(page); |
d1310b2e CM |
2754 | u64 page_end = start + PAGE_CACHE_SIZE - 1; |
2755 | u64 end; | |
2756 | u64 cur = start; | |
2757 | u64 extent_offset; | |
2758 | u64 last_byte = i_size_read(inode); | |
2759 | u64 block_start; | |
2760 | u64 cur_end; | |
2761 | sector_t sector; | |
2762 | struct extent_map *em; | |
2763 | struct block_device *bdev; | |
2764 | int ret; | |
2765 | int nr = 0; | |
4b384318 | 2766 | int parent_locked = *bio_flags & EXTENT_BIO_PARENT_LOCKED; |
306e16ce | 2767 | size_t pg_offset = 0; |
d1310b2e | 2768 | size_t iosize; |
c8b97818 | 2769 | size_t disk_io_size; |
d1310b2e | 2770 | size_t blocksize = inode->i_sb->s_blocksize; |
4b384318 | 2771 | unsigned long this_bio_flag = *bio_flags & EXTENT_BIO_PARENT_LOCKED; |
d1310b2e CM |
2772 | |
2773 | set_page_extent_mapped(page); | |
2774 | ||
9974090b | 2775 | end = page_end; |
90a887c9 DM |
2776 | if (!PageUptodate(page)) { |
2777 | if (cleancache_get_page(page) == 0) { | |
2778 | BUG_ON(blocksize != PAGE_SIZE); | |
9974090b | 2779 | unlock_extent(tree, start, end); |
90a887c9 DM |
2780 | goto out; |
2781 | } | |
2782 | } | |
2783 | ||
c8b97818 CM |
2784 | if (page->index == last_byte >> PAGE_CACHE_SHIFT) { |
2785 | char *userpage; | |
2786 | size_t zero_offset = last_byte & (PAGE_CACHE_SIZE - 1); | |
2787 | ||
2788 | if (zero_offset) { | |
2789 | iosize = PAGE_CACHE_SIZE - zero_offset; | |
7ac687d9 | 2790 | userpage = kmap_atomic(page); |
c8b97818 CM |
2791 | memset(userpage + zero_offset, 0, iosize); |
2792 | flush_dcache_page(page); | |
7ac687d9 | 2793 | kunmap_atomic(userpage); |
c8b97818 CM |
2794 | } |
2795 | } | |
d1310b2e | 2796 | while (cur <= end) { |
c8f2f24b JB |
2797 | unsigned long pnr = (last_byte >> PAGE_CACHE_SHIFT) + 1; |
2798 | ||
d1310b2e CM |
2799 | if (cur >= last_byte) { |
2800 | char *userpage; | |
507903b8 AJ |
2801 | struct extent_state *cached = NULL; |
2802 | ||
306e16ce | 2803 | iosize = PAGE_CACHE_SIZE - pg_offset; |
7ac687d9 | 2804 | userpage = kmap_atomic(page); |
306e16ce | 2805 | memset(userpage + pg_offset, 0, iosize); |
d1310b2e | 2806 | flush_dcache_page(page); |
7ac687d9 | 2807 | kunmap_atomic(userpage); |
d1310b2e | 2808 | set_extent_uptodate(tree, cur, cur + iosize - 1, |
507903b8 | 2809 | &cached, GFP_NOFS); |
4b384318 MF |
2810 | if (!parent_locked) |
2811 | unlock_extent_cached(tree, cur, | |
2812 | cur + iosize - 1, | |
2813 | &cached, GFP_NOFS); | |
d1310b2e CM |
2814 | break; |
2815 | } | |
125bac01 MX |
2816 | em = __get_extent_map(inode, page, pg_offset, cur, |
2817 | end - cur + 1, get_extent, em_cached); | |
c704005d | 2818 | if (IS_ERR_OR_NULL(em)) { |
d1310b2e | 2819 | SetPageError(page); |
4b384318 MF |
2820 | if (!parent_locked) |
2821 | unlock_extent(tree, cur, end); | |
d1310b2e CM |
2822 | break; |
2823 | } | |
d1310b2e CM |
2824 | extent_offset = cur - em->start; |
2825 | BUG_ON(extent_map_end(em) <= cur); | |
2826 | BUG_ON(end < cur); | |
2827 | ||
261507a0 | 2828 | if (test_bit(EXTENT_FLAG_COMPRESSED, &em->flags)) { |
4b384318 | 2829 | this_bio_flag |= EXTENT_BIO_COMPRESSED; |
261507a0 LZ |
2830 | extent_set_compress_type(&this_bio_flag, |
2831 | em->compress_type); | |
2832 | } | |
c8b97818 | 2833 | |
d1310b2e CM |
2834 | iosize = min(extent_map_end(em) - cur, end - cur + 1); |
2835 | cur_end = min(extent_map_end(em) - 1, end); | |
fda2832f | 2836 | iosize = ALIGN(iosize, blocksize); |
c8b97818 CM |
2837 | if (this_bio_flag & EXTENT_BIO_COMPRESSED) { |
2838 | disk_io_size = em->block_len; | |
2839 | sector = em->block_start >> 9; | |
2840 | } else { | |
2841 | sector = (em->block_start + extent_offset) >> 9; | |
2842 | disk_io_size = iosize; | |
2843 | } | |
d1310b2e CM |
2844 | bdev = em->bdev; |
2845 | block_start = em->block_start; | |
d899e052 YZ |
2846 | if (test_bit(EXTENT_FLAG_PREALLOC, &em->flags)) |
2847 | block_start = EXTENT_MAP_HOLE; | |
d1310b2e CM |
2848 | free_extent_map(em); |
2849 | em = NULL; | |
2850 | ||
2851 | /* we've found a hole, just zero and go on */ | |
2852 | if (block_start == EXTENT_MAP_HOLE) { | |
2853 | char *userpage; | |
507903b8 AJ |
2854 | struct extent_state *cached = NULL; |
2855 | ||
7ac687d9 | 2856 | userpage = kmap_atomic(page); |
306e16ce | 2857 | memset(userpage + pg_offset, 0, iosize); |
d1310b2e | 2858 | flush_dcache_page(page); |
7ac687d9 | 2859 | kunmap_atomic(userpage); |
d1310b2e CM |
2860 | |
2861 | set_extent_uptodate(tree, cur, cur + iosize - 1, | |
507903b8 AJ |
2862 | &cached, GFP_NOFS); |
2863 | unlock_extent_cached(tree, cur, cur + iosize - 1, | |
2864 | &cached, GFP_NOFS); | |
d1310b2e | 2865 | cur = cur + iosize; |
306e16ce | 2866 | pg_offset += iosize; |
d1310b2e CM |
2867 | continue; |
2868 | } | |
2869 | /* the get_extent function already copied into the page */ | |
9655d298 CM |
2870 | if (test_range_bit(tree, cur, cur_end, |
2871 | EXTENT_UPTODATE, 1, NULL)) { | |
a1b32a59 | 2872 | check_page_uptodate(tree, page); |
4b384318 MF |
2873 | if (!parent_locked) |
2874 | unlock_extent(tree, cur, cur + iosize - 1); | |
d1310b2e | 2875 | cur = cur + iosize; |
306e16ce | 2876 | pg_offset += iosize; |
d1310b2e CM |
2877 | continue; |
2878 | } | |
70dec807 CM |
2879 | /* we have an inline extent but it didn't get marked up |
2880 | * to date. Error out | |
2881 | */ | |
2882 | if (block_start == EXTENT_MAP_INLINE) { | |
2883 | SetPageError(page); | |
4b384318 MF |
2884 | if (!parent_locked) |
2885 | unlock_extent(tree, cur, cur + iosize - 1); | |
70dec807 | 2886 | cur = cur + iosize; |
306e16ce | 2887 | pg_offset += iosize; |
70dec807 CM |
2888 | continue; |
2889 | } | |
d1310b2e | 2890 | |
c8f2f24b | 2891 | pnr -= page->index; |
d4c7ca86 | 2892 | ret = submit_extent_page(rw, tree, page, |
306e16ce | 2893 | sector, disk_io_size, pg_offset, |
89642229 | 2894 | bdev, bio, pnr, |
c8b97818 CM |
2895 | end_bio_extent_readpage, mirror_num, |
2896 | *bio_flags, | |
2897 | this_bio_flag); | |
c8f2f24b JB |
2898 | if (!ret) { |
2899 | nr++; | |
2900 | *bio_flags = this_bio_flag; | |
2901 | } else { | |
d1310b2e | 2902 | SetPageError(page); |
4b384318 MF |
2903 | if (!parent_locked) |
2904 | unlock_extent(tree, cur, cur + iosize - 1); | |
edd33c99 | 2905 | } |
d1310b2e | 2906 | cur = cur + iosize; |
306e16ce | 2907 | pg_offset += iosize; |
d1310b2e | 2908 | } |
90a887c9 | 2909 | out: |
d1310b2e CM |
2910 | if (!nr) { |
2911 | if (!PageError(page)) | |
2912 | SetPageUptodate(page); | |
2913 | unlock_page(page); | |
2914 | } | |
2915 | return 0; | |
2916 | } | |
2917 | ||
9974090b MX |
2918 | static inline void __do_contiguous_readpages(struct extent_io_tree *tree, |
2919 | struct page *pages[], int nr_pages, | |
2920 | u64 start, u64 end, | |
2921 | get_extent_t *get_extent, | |
125bac01 | 2922 | struct extent_map **em_cached, |
9974090b MX |
2923 | struct bio **bio, int mirror_num, |
2924 | unsigned long *bio_flags, int rw) | |
2925 | { | |
2926 | struct inode *inode; | |
2927 | struct btrfs_ordered_extent *ordered; | |
2928 | int index; | |
2929 | ||
2930 | inode = pages[0]->mapping->host; | |
2931 | while (1) { | |
2932 | lock_extent(tree, start, end); | |
2933 | ordered = btrfs_lookup_ordered_range(inode, start, | |
2934 | end - start + 1); | |
2935 | if (!ordered) | |
2936 | break; | |
2937 | unlock_extent(tree, start, end); | |
2938 | btrfs_start_ordered_extent(inode, ordered, 1); | |
2939 | btrfs_put_ordered_extent(ordered); | |
2940 | } | |
2941 | ||
2942 | for (index = 0; index < nr_pages; index++) { | |
125bac01 MX |
2943 | __do_readpage(tree, pages[index], get_extent, em_cached, bio, |
2944 | mirror_num, bio_flags, rw); | |
9974090b MX |
2945 | page_cache_release(pages[index]); |
2946 | } | |
2947 | } | |
2948 | ||
2949 | static void __extent_readpages(struct extent_io_tree *tree, | |
2950 | struct page *pages[], | |
2951 | int nr_pages, get_extent_t *get_extent, | |
125bac01 | 2952 | struct extent_map **em_cached, |
9974090b MX |
2953 | struct bio **bio, int mirror_num, |
2954 | unsigned long *bio_flags, int rw) | |
2955 | { | |
35a3621b | 2956 | u64 start = 0; |
9974090b MX |
2957 | u64 end = 0; |
2958 | u64 page_start; | |
2959 | int index; | |
35a3621b | 2960 | int first_index = 0; |
9974090b MX |
2961 | |
2962 | for (index = 0; index < nr_pages; index++) { | |
2963 | page_start = page_offset(pages[index]); | |
2964 | if (!end) { | |
2965 | start = page_start; | |
2966 | end = start + PAGE_CACHE_SIZE - 1; | |
2967 | first_index = index; | |
2968 | } else if (end + 1 == page_start) { | |
2969 | end += PAGE_CACHE_SIZE; | |
2970 | } else { | |
2971 | __do_contiguous_readpages(tree, &pages[first_index], | |
2972 | index - first_index, start, | |
125bac01 MX |
2973 | end, get_extent, em_cached, |
2974 | bio, mirror_num, bio_flags, | |
2975 | rw); | |
9974090b MX |
2976 | start = page_start; |
2977 | end = start + PAGE_CACHE_SIZE - 1; | |
2978 | first_index = index; | |
2979 | } | |
2980 | } | |
2981 | ||
2982 | if (end) | |
2983 | __do_contiguous_readpages(tree, &pages[first_index], | |
2984 | index - first_index, start, | |
125bac01 | 2985 | end, get_extent, em_cached, bio, |
9974090b MX |
2986 | mirror_num, bio_flags, rw); |
2987 | } | |
2988 | ||
2989 | static int __extent_read_full_page(struct extent_io_tree *tree, | |
2990 | struct page *page, | |
2991 | get_extent_t *get_extent, | |
2992 | struct bio **bio, int mirror_num, | |
2993 | unsigned long *bio_flags, int rw) | |
2994 | { | |
2995 | struct inode *inode = page->mapping->host; | |
2996 | struct btrfs_ordered_extent *ordered; | |
2997 | u64 start = page_offset(page); | |
2998 | u64 end = start + PAGE_CACHE_SIZE - 1; | |
2999 | int ret; | |
3000 | ||
3001 | while (1) { | |
3002 | lock_extent(tree, start, end); | |
3003 | ordered = btrfs_lookup_ordered_extent(inode, start); | |
3004 | if (!ordered) | |
3005 | break; | |
3006 | unlock_extent(tree, start, end); | |
3007 | btrfs_start_ordered_extent(inode, ordered, 1); | |
3008 | btrfs_put_ordered_extent(ordered); | |
3009 | } | |
3010 | ||
125bac01 MX |
3011 | ret = __do_readpage(tree, page, get_extent, NULL, bio, mirror_num, |
3012 | bio_flags, rw); | |
9974090b MX |
3013 | return ret; |
3014 | } | |
3015 | ||
d1310b2e | 3016 | int extent_read_full_page(struct extent_io_tree *tree, struct page *page, |
8ddc7d9c | 3017 | get_extent_t *get_extent, int mirror_num) |
d1310b2e CM |
3018 | { |
3019 | struct bio *bio = NULL; | |
c8b97818 | 3020 | unsigned long bio_flags = 0; |
d1310b2e CM |
3021 | int ret; |
3022 | ||
8ddc7d9c | 3023 | ret = __extent_read_full_page(tree, page, get_extent, &bio, mirror_num, |
d4c7ca86 | 3024 | &bio_flags, READ); |
d1310b2e | 3025 | if (bio) |
8ddc7d9c | 3026 | ret = submit_one_bio(READ, bio, mirror_num, bio_flags); |
d1310b2e CM |
3027 | return ret; |
3028 | } | |
d1310b2e | 3029 | |
4b384318 MF |
3030 | int extent_read_full_page_nolock(struct extent_io_tree *tree, struct page *page, |
3031 | get_extent_t *get_extent, int mirror_num) | |
3032 | { | |
3033 | struct bio *bio = NULL; | |
3034 | unsigned long bio_flags = EXTENT_BIO_PARENT_LOCKED; | |
3035 | int ret; | |
3036 | ||
3037 | ret = __do_readpage(tree, page, get_extent, NULL, &bio, mirror_num, | |
3038 | &bio_flags, READ); | |
3039 | if (bio) | |
3040 | ret = submit_one_bio(READ, bio, mirror_num, bio_flags); | |
3041 | return ret; | |
3042 | } | |
3043 | ||
11c8349b CM |
3044 | static noinline void update_nr_written(struct page *page, |
3045 | struct writeback_control *wbc, | |
3046 | unsigned long nr_written) | |
3047 | { | |
3048 | wbc->nr_to_write -= nr_written; | |
3049 | if (wbc->range_cyclic || (wbc->nr_to_write > 0 && | |
3050 | wbc->range_start == 0 && wbc->range_end == LLONG_MAX)) | |
3051 | page->mapping->writeback_index = page->index + nr_written; | |
3052 | } | |
3053 | ||
d1310b2e CM |
3054 | /* |
3055 | * the writepage semantics are similar to regular writepage. extent | |
3056 | * records are inserted to lock ranges in the tree, and as dirty areas | |
3057 | * are found, they are marked writeback. Then the lock bits are removed | |
3058 | * and the end_io handler clears the writeback ranges | |
3059 | */ | |
3060 | static int __extent_writepage(struct page *page, struct writeback_control *wbc, | |
3061 | void *data) | |
3062 | { | |
3063 | struct inode *inode = page->mapping->host; | |
3064 | struct extent_page_data *epd = data; | |
3065 | struct extent_io_tree *tree = epd->tree; | |
4eee4fa4 | 3066 | u64 start = page_offset(page); |
d1310b2e CM |
3067 | u64 delalloc_start; |
3068 | u64 page_end = start + PAGE_CACHE_SIZE - 1; | |
3069 | u64 end; | |
3070 | u64 cur = start; | |
3071 | u64 extent_offset; | |
3072 | u64 last_byte = i_size_read(inode); | |
3073 | u64 block_start; | |
3074 | u64 iosize; | |
3075 | sector_t sector; | |
2c64c53d | 3076 | struct extent_state *cached_state = NULL; |
d1310b2e CM |
3077 | struct extent_map *em; |
3078 | struct block_device *bdev; | |
3079 | int ret; | |
3080 | int nr = 0; | |
7f3c74fb | 3081 | size_t pg_offset = 0; |
d1310b2e CM |
3082 | size_t blocksize; |
3083 | loff_t i_size = i_size_read(inode); | |
3084 | unsigned long end_index = i_size >> PAGE_CACHE_SHIFT; | |
3085 | u64 nr_delalloc; | |
3086 | u64 delalloc_end; | |
c8b97818 CM |
3087 | int page_started; |
3088 | int compressed; | |
ffbd517d | 3089 | int write_flags; |
771ed689 | 3090 | unsigned long nr_written = 0; |
9e487107 | 3091 | bool fill_delalloc = true; |
d1310b2e | 3092 | |
ffbd517d | 3093 | if (wbc->sync_mode == WB_SYNC_ALL) |
721a9602 | 3094 | write_flags = WRITE_SYNC; |
ffbd517d CM |
3095 | else |
3096 | write_flags = WRITE; | |
3097 | ||
1abe9b8a | 3098 | trace___extent_writepage(page, inode, wbc); |
3099 | ||
d1310b2e | 3100 | WARN_ON(!PageLocked(page)); |
bf0da8c1 CM |
3101 | |
3102 | ClearPageError(page); | |
3103 | ||
7f3c74fb | 3104 | pg_offset = i_size & (PAGE_CACHE_SIZE - 1); |
211c17f5 | 3105 | if (page->index > end_index || |
7f3c74fb | 3106 | (page->index == end_index && !pg_offset)) { |
d47992f8 | 3107 | page->mapping->a_ops->invalidatepage(page, 0, PAGE_CACHE_SIZE); |
d1310b2e CM |
3108 | unlock_page(page); |
3109 | return 0; | |
3110 | } | |
3111 | ||
3112 | if (page->index == end_index) { | |
3113 | char *userpage; | |
3114 | ||
7ac687d9 | 3115 | userpage = kmap_atomic(page); |
7f3c74fb CM |
3116 | memset(userpage + pg_offset, 0, |
3117 | PAGE_CACHE_SIZE - pg_offset); | |
7ac687d9 | 3118 | kunmap_atomic(userpage); |
211c17f5 | 3119 | flush_dcache_page(page); |
d1310b2e | 3120 | } |
7f3c74fb | 3121 | pg_offset = 0; |
d1310b2e CM |
3122 | |
3123 | set_page_extent_mapped(page); | |
3124 | ||
9e487107 JB |
3125 | if (!tree->ops || !tree->ops->fill_delalloc) |
3126 | fill_delalloc = false; | |
3127 | ||
d1310b2e CM |
3128 | delalloc_start = start; |
3129 | delalloc_end = 0; | |
c8b97818 | 3130 | page_started = 0; |
9e487107 | 3131 | if (!epd->extent_locked && fill_delalloc) { |
f85d7d6c | 3132 | u64 delalloc_to_write = 0; |
11c8349b CM |
3133 | /* |
3134 | * make sure the wbc mapping index is at least updated | |
3135 | * to this page. | |
3136 | */ | |
3137 | update_nr_written(page, wbc, 0); | |
3138 | ||
d397712b | 3139 | while (delalloc_end < page_end) { |
771ed689 | 3140 | nr_delalloc = find_lock_delalloc_range(inode, tree, |
c8b97818 CM |
3141 | page, |
3142 | &delalloc_start, | |
d1310b2e CM |
3143 | &delalloc_end, |
3144 | 128 * 1024 * 1024); | |
771ed689 CM |
3145 | if (nr_delalloc == 0) { |
3146 | delalloc_start = delalloc_end + 1; | |
3147 | continue; | |
3148 | } | |
013bd4c3 TI |
3149 | ret = tree->ops->fill_delalloc(inode, page, |
3150 | delalloc_start, | |
3151 | delalloc_end, | |
3152 | &page_started, | |
3153 | &nr_written); | |
79787eaa JM |
3154 | /* File system has been set read-only */ |
3155 | if (ret) { | |
3156 | SetPageError(page); | |
3157 | goto done; | |
3158 | } | |
f85d7d6c CM |
3159 | /* |
3160 | * delalloc_end is already one less than the total | |
3161 | * length, so we don't subtract one from | |
3162 | * PAGE_CACHE_SIZE | |
3163 | */ | |
3164 | delalloc_to_write += (delalloc_end - delalloc_start + | |
3165 | PAGE_CACHE_SIZE) >> | |
3166 | PAGE_CACHE_SHIFT; | |
d1310b2e | 3167 | delalloc_start = delalloc_end + 1; |
d1310b2e | 3168 | } |
f85d7d6c CM |
3169 | if (wbc->nr_to_write < delalloc_to_write) { |
3170 | int thresh = 8192; | |
3171 | ||
3172 | if (delalloc_to_write < thresh * 2) | |
3173 | thresh = delalloc_to_write; | |
3174 | wbc->nr_to_write = min_t(u64, delalloc_to_write, | |
3175 | thresh); | |
3176 | } | |
c8b97818 | 3177 | |
771ed689 CM |
3178 | /* did the fill delalloc function already unlock and start |
3179 | * the IO? | |
3180 | */ | |
3181 | if (page_started) { | |
3182 | ret = 0; | |
11c8349b CM |
3183 | /* |
3184 | * we've unlocked the page, so we can't update | |
3185 | * the mapping's writeback index, just update | |
3186 | * nr_to_write. | |
3187 | */ | |
3188 | wbc->nr_to_write -= nr_written; | |
3189 | goto done_unlocked; | |
771ed689 | 3190 | } |
c8b97818 | 3191 | } |
247e743c | 3192 | if (tree->ops && tree->ops->writepage_start_hook) { |
c8b97818 CM |
3193 | ret = tree->ops->writepage_start_hook(page, start, |
3194 | page_end); | |
87826df0 JM |
3195 | if (ret) { |
3196 | /* Fixup worker will requeue */ | |
3197 | if (ret == -EBUSY) | |
3198 | wbc->pages_skipped++; | |
3199 | else | |
3200 | redirty_page_for_writepage(wbc, page); | |
11c8349b | 3201 | update_nr_written(page, wbc, nr_written); |
247e743c | 3202 | unlock_page(page); |
771ed689 | 3203 | ret = 0; |
11c8349b | 3204 | goto done_unlocked; |
247e743c CM |
3205 | } |
3206 | } | |
3207 | ||
11c8349b CM |
3208 | /* |
3209 | * we don't want to touch the inode after unlocking the page, | |
3210 | * so we update the mapping writeback index now | |
3211 | */ | |
3212 | update_nr_written(page, wbc, nr_written + 1); | |
771ed689 | 3213 | |
d1310b2e | 3214 | end = page_end; |
d1310b2e | 3215 | if (last_byte <= start) { |
e6dcd2dc CM |
3216 | if (tree->ops && tree->ops->writepage_end_io_hook) |
3217 | tree->ops->writepage_end_io_hook(page, start, | |
3218 | page_end, NULL, 1); | |
d1310b2e CM |
3219 | goto done; |
3220 | } | |
3221 | ||
d1310b2e CM |
3222 | blocksize = inode->i_sb->s_blocksize; |
3223 | ||
3224 | while (cur <= end) { | |
3225 | if (cur >= last_byte) { | |
e6dcd2dc CM |
3226 | if (tree->ops && tree->ops->writepage_end_io_hook) |
3227 | tree->ops->writepage_end_io_hook(page, cur, | |
3228 | page_end, NULL, 1); | |
d1310b2e CM |
3229 | break; |
3230 | } | |
7f3c74fb | 3231 | em = epd->get_extent(inode, page, pg_offset, cur, |
d1310b2e | 3232 | end - cur + 1, 1); |
c704005d | 3233 | if (IS_ERR_OR_NULL(em)) { |
d1310b2e CM |
3234 | SetPageError(page); |
3235 | break; | |
3236 | } | |
3237 | ||
3238 | extent_offset = cur - em->start; | |
3239 | BUG_ON(extent_map_end(em) <= cur); | |
3240 | BUG_ON(end < cur); | |
3241 | iosize = min(extent_map_end(em) - cur, end - cur + 1); | |
fda2832f | 3242 | iosize = ALIGN(iosize, blocksize); |
d1310b2e CM |
3243 | sector = (em->block_start + extent_offset) >> 9; |
3244 | bdev = em->bdev; | |
3245 | block_start = em->block_start; | |
c8b97818 | 3246 | compressed = test_bit(EXTENT_FLAG_COMPRESSED, &em->flags); |
d1310b2e CM |
3247 | free_extent_map(em); |
3248 | em = NULL; | |
3249 | ||
c8b97818 CM |
3250 | /* |
3251 | * compressed and inline extents are written through other | |
3252 | * paths in the FS | |
3253 | */ | |
3254 | if (compressed || block_start == EXTENT_MAP_HOLE || | |
d1310b2e | 3255 | block_start == EXTENT_MAP_INLINE) { |
c8b97818 CM |
3256 | /* |
3257 | * end_io notification does not happen here for | |
3258 | * compressed extents | |
3259 | */ | |
3260 | if (!compressed && tree->ops && | |
3261 | tree->ops->writepage_end_io_hook) | |
e6dcd2dc CM |
3262 | tree->ops->writepage_end_io_hook(page, cur, |
3263 | cur + iosize - 1, | |
3264 | NULL, 1); | |
c8b97818 CM |
3265 | else if (compressed) { |
3266 | /* we don't want to end_page_writeback on | |
3267 | * a compressed extent. this happens | |
3268 | * elsewhere | |
3269 | */ | |
3270 | nr++; | |
3271 | } | |
3272 | ||
3273 | cur += iosize; | |
7f3c74fb | 3274 | pg_offset += iosize; |
d1310b2e CM |
3275 | continue; |
3276 | } | |
d1310b2e CM |
3277 | /* leave this out until we have a page_mkwrite call */ |
3278 | if (0 && !test_range_bit(tree, cur, cur + iosize - 1, | |
9655d298 | 3279 | EXTENT_DIRTY, 0, NULL)) { |
d1310b2e | 3280 | cur = cur + iosize; |
7f3c74fb | 3281 | pg_offset += iosize; |
d1310b2e CM |
3282 | continue; |
3283 | } | |
c8b97818 | 3284 | |
d1310b2e CM |
3285 | if (tree->ops && tree->ops->writepage_io_hook) { |
3286 | ret = tree->ops->writepage_io_hook(page, cur, | |
3287 | cur + iosize - 1); | |
3288 | } else { | |
3289 | ret = 0; | |
3290 | } | |
1259ab75 | 3291 | if (ret) { |
d1310b2e | 3292 | SetPageError(page); |
1259ab75 | 3293 | } else { |
d1310b2e | 3294 | unsigned long max_nr = end_index + 1; |
7f3c74fb | 3295 | |
d1310b2e CM |
3296 | set_range_writeback(tree, cur, cur + iosize - 1); |
3297 | if (!PageWriteback(page)) { | |
d397712b CM |
3298 | printk(KERN_ERR "btrfs warning page %lu not " |
3299 | "writeback, cur %llu end %llu\n", | |
c1c9ff7c | 3300 | page->index, cur, end); |
d1310b2e CM |
3301 | } |
3302 | ||
ffbd517d CM |
3303 | ret = submit_extent_page(write_flags, tree, page, |
3304 | sector, iosize, pg_offset, | |
3305 | bdev, &epd->bio, max_nr, | |
c8b97818 CM |
3306 | end_bio_extent_writepage, |
3307 | 0, 0, 0); | |
d1310b2e CM |
3308 | if (ret) |
3309 | SetPageError(page); | |
3310 | } | |
3311 | cur = cur + iosize; | |
7f3c74fb | 3312 | pg_offset += iosize; |
d1310b2e CM |
3313 | nr++; |
3314 | } | |
3315 | done: | |
3316 | if (nr == 0) { | |
3317 | /* make sure the mapping tag for page dirty gets cleared */ | |
3318 | set_page_writeback(page); | |
3319 | end_page_writeback(page); | |
3320 | } | |
d1310b2e | 3321 | unlock_page(page); |
771ed689 | 3322 | |
11c8349b CM |
3323 | done_unlocked: |
3324 | ||
2c64c53d CM |
3325 | /* drop our reference on any cached states */ |
3326 | free_extent_state(cached_state); | |
d1310b2e CM |
3327 | return 0; |
3328 | } | |
3329 | ||
0b32f4bb JB |
3330 | static int eb_wait(void *word) |
3331 | { | |
3332 | io_schedule(); | |
3333 | return 0; | |
3334 | } | |
3335 | ||
fd8b2b61 | 3336 | void wait_on_extent_buffer_writeback(struct extent_buffer *eb) |
0b32f4bb JB |
3337 | { |
3338 | wait_on_bit(&eb->bflags, EXTENT_BUFFER_WRITEBACK, eb_wait, | |
3339 | TASK_UNINTERRUPTIBLE); | |
3340 | } | |
3341 | ||
3342 | static int lock_extent_buffer_for_io(struct extent_buffer *eb, | |
3343 | struct btrfs_fs_info *fs_info, | |
3344 | struct extent_page_data *epd) | |
3345 | { | |
3346 | unsigned long i, num_pages; | |
3347 | int flush = 0; | |
3348 | int ret = 0; | |
3349 | ||
3350 | if (!btrfs_try_tree_write_lock(eb)) { | |
3351 | flush = 1; | |
3352 | flush_write_bio(epd); | |
3353 | btrfs_tree_lock(eb); | |
3354 | } | |
3355 | ||
3356 | if (test_bit(EXTENT_BUFFER_WRITEBACK, &eb->bflags)) { | |
3357 | btrfs_tree_unlock(eb); | |
3358 | if (!epd->sync_io) | |
3359 | return 0; | |
3360 | if (!flush) { | |
3361 | flush_write_bio(epd); | |
3362 | flush = 1; | |
3363 | } | |
a098d8e8 CM |
3364 | while (1) { |
3365 | wait_on_extent_buffer_writeback(eb); | |
3366 | btrfs_tree_lock(eb); | |
3367 | if (!test_bit(EXTENT_BUFFER_WRITEBACK, &eb->bflags)) | |
3368 | break; | |
0b32f4bb | 3369 | btrfs_tree_unlock(eb); |
0b32f4bb JB |
3370 | } |
3371 | } | |
3372 | ||
51561ffe JB |
3373 | /* |
3374 | * We need to do this to prevent races in people who check if the eb is | |
3375 | * under IO since we can end up having no IO bits set for a short period | |
3376 | * of time. | |
3377 | */ | |
3378 | spin_lock(&eb->refs_lock); | |
0b32f4bb JB |
3379 | if (test_and_clear_bit(EXTENT_BUFFER_DIRTY, &eb->bflags)) { |
3380 | set_bit(EXTENT_BUFFER_WRITEBACK, &eb->bflags); | |
51561ffe | 3381 | spin_unlock(&eb->refs_lock); |
0b32f4bb | 3382 | btrfs_set_header_flag(eb, BTRFS_HEADER_FLAG_WRITTEN); |
e2d84521 MX |
3383 | __percpu_counter_add(&fs_info->dirty_metadata_bytes, |
3384 | -eb->len, | |
3385 | fs_info->dirty_metadata_batch); | |
0b32f4bb | 3386 | ret = 1; |
51561ffe JB |
3387 | } else { |
3388 | spin_unlock(&eb->refs_lock); | |
0b32f4bb JB |
3389 | } |
3390 | ||
3391 | btrfs_tree_unlock(eb); | |
3392 | ||
3393 | if (!ret) | |
3394 | return ret; | |
3395 | ||
3396 | num_pages = num_extent_pages(eb->start, eb->len); | |
3397 | for (i = 0; i < num_pages; i++) { | |
3398 | struct page *p = extent_buffer_page(eb, i); | |
3399 | ||
3400 | if (!trylock_page(p)) { | |
3401 | if (!flush) { | |
3402 | flush_write_bio(epd); | |
3403 | flush = 1; | |
3404 | } | |
3405 | lock_page(p); | |
3406 | } | |
3407 | } | |
3408 | ||
3409 | return ret; | |
3410 | } | |
3411 | ||
3412 | static void end_extent_buffer_writeback(struct extent_buffer *eb) | |
3413 | { | |
3414 | clear_bit(EXTENT_BUFFER_WRITEBACK, &eb->bflags); | |
3415 | smp_mb__after_clear_bit(); | |
3416 | wake_up_bit(&eb->bflags, EXTENT_BUFFER_WRITEBACK); | |
3417 | } | |
3418 | ||
3419 | static void end_bio_extent_buffer_writepage(struct bio *bio, int err) | |
3420 | { | |
3421 | int uptodate = err == 0; | |
3422 | struct bio_vec *bvec = bio->bi_io_vec + bio->bi_vcnt - 1; | |
3423 | struct extent_buffer *eb; | |
3424 | int done; | |
3425 | ||
3426 | do { | |
3427 | struct page *page = bvec->bv_page; | |
3428 | ||
3429 | bvec--; | |
3430 | eb = (struct extent_buffer *)page->private; | |
3431 | BUG_ON(!eb); | |
3432 | done = atomic_dec_and_test(&eb->io_pages); | |
3433 | ||
3434 | if (!uptodate || test_bit(EXTENT_BUFFER_IOERR, &eb->bflags)) { | |
3435 | set_bit(EXTENT_BUFFER_IOERR, &eb->bflags); | |
3436 | ClearPageUptodate(page); | |
3437 | SetPageError(page); | |
3438 | } | |
3439 | ||
3440 | end_page_writeback(page); | |
3441 | ||
3442 | if (!done) | |
3443 | continue; | |
3444 | ||
3445 | end_extent_buffer_writeback(eb); | |
3446 | } while (bvec >= bio->bi_io_vec); | |
3447 | ||
3448 | bio_put(bio); | |
3449 | ||
3450 | } | |
3451 | ||
3452 | static int write_one_eb(struct extent_buffer *eb, | |
3453 | struct btrfs_fs_info *fs_info, | |
3454 | struct writeback_control *wbc, | |
3455 | struct extent_page_data *epd) | |
3456 | { | |
3457 | struct block_device *bdev = fs_info->fs_devices->latest_bdev; | |
3458 | u64 offset = eb->start; | |
3459 | unsigned long i, num_pages; | |
de0022b9 | 3460 | unsigned long bio_flags = 0; |
d4c7ca86 | 3461 | int rw = (epd->sync_io ? WRITE_SYNC : WRITE) | REQ_META; |
d7dbe9e7 | 3462 | int ret = 0; |
0b32f4bb JB |
3463 | |
3464 | clear_bit(EXTENT_BUFFER_IOERR, &eb->bflags); | |
3465 | num_pages = num_extent_pages(eb->start, eb->len); | |
3466 | atomic_set(&eb->io_pages, num_pages); | |
de0022b9 JB |
3467 | if (btrfs_header_owner(eb) == BTRFS_TREE_LOG_OBJECTID) |
3468 | bio_flags = EXTENT_BIO_TREE_LOG; | |
3469 | ||
0b32f4bb JB |
3470 | for (i = 0; i < num_pages; i++) { |
3471 | struct page *p = extent_buffer_page(eb, i); | |
3472 | ||
3473 | clear_page_dirty_for_io(p); | |
3474 | set_page_writeback(p); | |
3475 | ret = submit_extent_page(rw, eb->tree, p, offset >> 9, | |
3476 | PAGE_CACHE_SIZE, 0, bdev, &epd->bio, | |
3477 | -1, end_bio_extent_buffer_writepage, | |
de0022b9 JB |
3478 | 0, epd->bio_flags, bio_flags); |
3479 | epd->bio_flags = bio_flags; | |
0b32f4bb JB |
3480 | if (ret) { |
3481 | set_bit(EXTENT_BUFFER_IOERR, &eb->bflags); | |
3482 | SetPageError(p); | |
3483 | if (atomic_sub_and_test(num_pages - i, &eb->io_pages)) | |
3484 | end_extent_buffer_writeback(eb); | |
3485 | ret = -EIO; | |
3486 | break; | |
3487 | } | |
3488 | offset += PAGE_CACHE_SIZE; | |
3489 | update_nr_written(p, wbc, 1); | |
3490 | unlock_page(p); | |
3491 | } | |
3492 | ||
3493 | if (unlikely(ret)) { | |
3494 | for (; i < num_pages; i++) { | |
3495 | struct page *p = extent_buffer_page(eb, i); | |
3496 | unlock_page(p); | |
3497 | } | |
3498 | } | |
3499 | ||
3500 | return ret; | |
3501 | } | |
3502 | ||
3503 | int btree_write_cache_pages(struct address_space *mapping, | |
3504 | struct writeback_control *wbc) | |
3505 | { | |
3506 | struct extent_io_tree *tree = &BTRFS_I(mapping->host)->io_tree; | |
3507 | struct btrfs_fs_info *fs_info = BTRFS_I(mapping->host)->root->fs_info; | |
3508 | struct extent_buffer *eb, *prev_eb = NULL; | |
3509 | struct extent_page_data epd = { | |
3510 | .bio = NULL, | |
3511 | .tree = tree, | |
3512 | .extent_locked = 0, | |
3513 | .sync_io = wbc->sync_mode == WB_SYNC_ALL, | |
de0022b9 | 3514 | .bio_flags = 0, |
0b32f4bb JB |
3515 | }; |
3516 | int ret = 0; | |
3517 | int done = 0; | |
3518 | int nr_to_write_done = 0; | |
3519 | struct pagevec pvec; | |
3520 | int nr_pages; | |
3521 | pgoff_t index; | |
3522 | pgoff_t end; /* Inclusive */ | |
3523 | int scanned = 0; | |
3524 | int tag; | |
3525 | ||
3526 | pagevec_init(&pvec, 0); | |
3527 | if (wbc->range_cyclic) { | |
3528 | index = mapping->writeback_index; /* Start from prev offset */ | |
3529 | end = -1; | |
3530 | } else { | |
3531 | index = wbc->range_start >> PAGE_CACHE_SHIFT; | |
3532 | end = wbc->range_end >> PAGE_CACHE_SHIFT; | |
3533 | scanned = 1; | |
3534 | } | |
3535 | if (wbc->sync_mode == WB_SYNC_ALL) | |
3536 | tag = PAGECACHE_TAG_TOWRITE; | |
3537 | else | |
3538 | tag = PAGECACHE_TAG_DIRTY; | |
3539 | retry: | |
3540 | if (wbc->sync_mode == WB_SYNC_ALL) | |
3541 | tag_pages_for_writeback(mapping, index, end); | |
3542 | while (!done && !nr_to_write_done && (index <= end) && | |
3543 | (nr_pages = pagevec_lookup_tag(&pvec, mapping, &index, tag, | |
3544 | min(end - index, (pgoff_t)PAGEVEC_SIZE-1) + 1))) { | |
3545 | unsigned i; | |
3546 | ||
3547 | scanned = 1; | |
3548 | for (i = 0; i < nr_pages; i++) { | |
3549 | struct page *page = pvec.pages[i]; | |
3550 | ||
3551 | if (!PagePrivate(page)) | |
3552 | continue; | |
3553 | ||
3554 | if (!wbc->range_cyclic && page->index > end) { | |
3555 | done = 1; | |
3556 | break; | |
3557 | } | |
3558 | ||
b5bae261 JB |
3559 | spin_lock(&mapping->private_lock); |
3560 | if (!PagePrivate(page)) { | |
3561 | spin_unlock(&mapping->private_lock); | |
3562 | continue; | |
3563 | } | |
3564 | ||
0b32f4bb | 3565 | eb = (struct extent_buffer *)page->private; |
b5bae261 JB |
3566 | |
3567 | /* | |
3568 | * Shouldn't happen and normally this would be a BUG_ON | |
3569 | * but no sense in crashing the users box for something | |
3570 | * we can survive anyway. | |
3571 | */ | |
0b32f4bb | 3572 | if (!eb) { |
b5bae261 | 3573 | spin_unlock(&mapping->private_lock); |
0b32f4bb JB |
3574 | WARN_ON(1); |
3575 | continue; | |
3576 | } | |
3577 | ||
b5bae261 JB |
3578 | if (eb == prev_eb) { |
3579 | spin_unlock(&mapping->private_lock); | |
0b32f4bb | 3580 | continue; |
b5bae261 | 3581 | } |
0b32f4bb | 3582 | |
b5bae261 JB |
3583 | ret = atomic_inc_not_zero(&eb->refs); |
3584 | spin_unlock(&mapping->private_lock); | |
3585 | if (!ret) | |
0b32f4bb | 3586 | continue; |
0b32f4bb JB |
3587 | |
3588 | prev_eb = eb; | |
3589 | ret = lock_extent_buffer_for_io(eb, fs_info, &epd); | |
3590 | if (!ret) { | |
3591 | free_extent_buffer(eb); | |
3592 | continue; | |
3593 | } | |
3594 | ||
3595 | ret = write_one_eb(eb, fs_info, wbc, &epd); | |
3596 | if (ret) { | |
3597 | done = 1; | |
3598 | free_extent_buffer(eb); | |
3599 | break; | |
3600 | } | |
3601 | free_extent_buffer(eb); | |
3602 | ||
3603 | /* | |
3604 | * the filesystem may choose to bump up nr_to_write. | |
3605 | * We have to make sure to honor the new nr_to_write | |
3606 | * at any time | |
3607 | */ | |
3608 | nr_to_write_done = wbc->nr_to_write <= 0; | |
3609 | } | |
3610 | pagevec_release(&pvec); | |
3611 | cond_resched(); | |
3612 | } | |
3613 | if (!scanned && !done) { | |
3614 | /* | |
3615 | * We hit the last page and there is more work to be done: wrap | |
3616 | * back to the start of the file | |
3617 | */ | |
3618 | scanned = 1; | |
3619 | index = 0; | |
3620 | goto retry; | |
3621 | } | |
3622 | flush_write_bio(&epd); | |
3623 | return ret; | |
3624 | } | |
3625 | ||
d1310b2e | 3626 | /** |
4bef0848 | 3627 | * write_cache_pages - walk the list of dirty pages of the given address space and write all of them. |
d1310b2e CM |
3628 | * @mapping: address space structure to write |
3629 | * @wbc: subtract the number of written pages from *@wbc->nr_to_write | |
3630 | * @writepage: function called for each page | |
3631 | * @data: data passed to writepage function | |
3632 | * | |
3633 | * If a page is already under I/O, write_cache_pages() skips it, even | |
3634 | * if it's dirty. This is desirable behaviour for memory-cleaning writeback, | |
3635 | * but it is INCORRECT for data-integrity system calls such as fsync(). fsync() | |
3636 | * and msync() need to guarantee that all the data which was dirty at the time | |
3637 | * the call was made get new I/O started against them. If wbc->sync_mode is | |
3638 | * WB_SYNC_ALL then we were called for data integrity and we must wait for | |
3639 | * existing IO to complete. | |
3640 | */ | |
b2950863 | 3641 | static int extent_write_cache_pages(struct extent_io_tree *tree, |
4bef0848 CM |
3642 | struct address_space *mapping, |
3643 | struct writeback_control *wbc, | |
d2c3f4f6 CM |
3644 | writepage_t writepage, void *data, |
3645 | void (*flush_fn)(void *)) | |
d1310b2e | 3646 | { |
7fd1a3f7 | 3647 | struct inode *inode = mapping->host; |
d1310b2e CM |
3648 | int ret = 0; |
3649 | int done = 0; | |
f85d7d6c | 3650 | int nr_to_write_done = 0; |
d1310b2e CM |
3651 | struct pagevec pvec; |
3652 | int nr_pages; | |
3653 | pgoff_t index; | |
3654 | pgoff_t end; /* Inclusive */ | |
3655 | int scanned = 0; | |
f7aaa06b | 3656 | int tag; |
d1310b2e | 3657 | |
7fd1a3f7 JB |
3658 | /* |
3659 | * We have to hold onto the inode so that ordered extents can do their | |
3660 | * work when the IO finishes. The alternative to this is failing to add | |
3661 | * an ordered extent if the igrab() fails there and that is a huge pain | |
3662 | * to deal with, so instead just hold onto the inode throughout the | |
3663 | * writepages operation. If it fails here we are freeing up the inode | |
3664 | * anyway and we'd rather not waste our time writing out stuff that is | |
3665 | * going to be truncated anyway. | |
3666 | */ | |
3667 | if (!igrab(inode)) | |
3668 | return 0; | |
3669 | ||
d1310b2e CM |
3670 | pagevec_init(&pvec, 0); |
3671 | if (wbc->range_cyclic) { | |
3672 | index = mapping->writeback_index; /* Start from prev offset */ | |
3673 | end = -1; | |
3674 | } else { | |
3675 | index = wbc->range_start >> PAGE_CACHE_SHIFT; | |
3676 | end = wbc->range_end >> PAGE_CACHE_SHIFT; | |
d1310b2e CM |
3677 | scanned = 1; |
3678 | } | |
f7aaa06b JB |
3679 | if (wbc->sync_mode == WB_SYNC_ALL) |
3680 | tag = PAGECACHE_TAG_TOWRITE; | |
3681 | else | |
3682 | tag = PAGECACHE_TAG_DIRTY; | |
d1310b2e | 3683 | retry: |
f7aaa06b JB |
3684 | if (wbc->sync_mode == WB_SYNC_ALL) |
3685 | tag_pages_for_writeback(mapping, index, end); | |
f85d7d6c | 3686 | while (!done && !nr_to_write_done && (index <= end) && |
f7aaa06b JB |
3687 | (nr_pages = pagevec_lookup_tag(&pvec, mapping, &index, tag, |
3688 | min(end - index, (pgoff_t)PAGEVEC_SIZE-1) + 1))) { | |
d1310b2e CM |
3689 | unsigned i; |
3690 | ||
3691 | scanned = 1; | |
3692 | for (i = 0; i < nr_pages; i++) { | |
3693 | struct page *page = pvec.pages[i]; | |
3694 | ||
3695 | /* | |
3696 | * At this point we hold neither mapping->tree_lock nor | |
3697 | * lock on the page itself: the page may be truncated or | |
3698 | * invalidated (changing page->mapping to NULL), or even | |
3699 | * swizzled back from swapper_space to tmpfs file | |
3700 | * mapping | |
3701 | */ | |
c8f2f24b JB |
3702 | if (!trylock_page(page)) { |
3703 | flush_fn(data); | |
3704 | lock_page(page); | |
01d658f2 | 3705 | } |
d1310b2e CM |
3706 | |
3707 | if (unlikely(page->mapping != mapping)) { | |
3708 | unlock_page(page); | |
3709 | continue; | |
3710 | } | |
3711 | ||
3712 | if (!wbc->range_cyclic && page->index > end) { | |
3713 | done = 1; | |
3714 | unlock_page(page); | |
3715 | continue; | |
3716 | } | |
3717 | ||
d2c3f4f6 | 3718 | if (wbc->sync_mode != WB_SYNC_NONE) { |
0e6bd956 CM |
3719 | if (PageWriteback(page)) |
3720 | flush_fn(data); | |
d1310b2e | 3721 | wait_on_page_writeback(page); |
d2c3f4f6 | 3722 | } |
d1310b2e CM |
3723 | |
3724 | if (PageWriteback(page) || | |
3725 | !clear_page_dirty_for_io(page)) { | |
3726 | unlock_page(page); | |
3727 | continue; | |
3728 | } | |
3729 | ||
3730 | ret = (*writepage)(page, wbc, data); | |
3731 | ||
3732 | if (unlikely(ret == AOP_WRITEPAGE_ACTIVATE)) { | |
3733 | unlock_page(page); | |
3734 | ret = 0; | |
3735 | } | |
f85d7d6c | 3736 | if (ret) |
d1310b2e | 3737 | done = 1; |
f85d7d6c CM |
3738 | |
3739 | /* | |
3740 | * the filesystem may choose to bump up nr_to_write. | |
3741 | * We have to make sure to honor the new nr_to_write | |
3742 | * at any time | |
3743 | */ | |
3744 | nr_to_write_done = wbc->nr_to_write <= 0; | |
d1310b2e CM |
3745 | } |
3746 | pagevec_release(&pvec); | |
3747 | cond_resched(); | |
3748 | } | |
3749 | if (!scanned && !done) { | |
3750 | /* | |
3751 | * We hit the last page and there is more work to be done: wrap | |
3752 | * back to the start of the file | |
3753 | */ | |
3754 | scanned = 1; | |
3755 | index = 0; | |
3756 | goto retry; | |
3757 | } | |
7fd1a3f7 | 3758 | btrfs_add_delayed_iput(inode); |
d1310b2e CM |
3759 | return ret; |
3760 | } | |
d1310b2e | 3761 | |
ffbd517d | 3762 | static void flush_epd_write_bio(struct extent_page_data *epd) |
d2c3f4f6 | 3763 | { |
d2c3f4f6 | 3764 | if (epd->bio) { |
355808c2 JM |
3765 | int rw = WRITE; |
3766 | int ret; | |
3767 | ||
ffbd517d | 3768 | if (epd->sync_io) |
355808c2 JM |
3769 | rw = WRITE_SYNC; |
3770 | ||
de0022b9 | 3771 | ret = submit_one_bio(rw, epd->bio, 0, epd->bio_flags); |
79787eaa | 3772 | BUG_ON(ret < 0); /* -ENOMEM */ |
d2c3f4f6 CM |
3773 | epd->bio = NULL; |
3774 | } | |
3775 | } | |
3776 | ||
ffbd517d CM |
3777 | static noinline void flush_write_bio(void *data) |
3778 | { | |
3779 | struct extent_page_data *epd = data; | |
3780 | flush_epd_write_bio(epd); | |
3781 | } | |
3782 | ||
d1310b2e CM |
3783 | int extent_write_full_page(struct extent_io_tree *tree, struct page *page, |
3784 | get_extent_t *get_extent, | |
3785 | struct writeback_control *wbc) | |
3786 | { | |
3787 | int ret; | |
d1310b2e CM |
3788 | struct extent_page_data epd = { |
3789 | .bio = NULL, | |
3790 | .tree = tree, | |
3791 | .get_extent = get_extent, | |
771ed689 | 3792 | .extent_locked = 0, |
ffbd517d | 3793 | .sync_io = wbc->sync_mode == WB_SYNC_ALL, |
de0022b9 | 3794 | .bio_flags = 0, |
d1310b2e | 3795 | }; |
d1310b2e | 3796 | |
d1310b2e CM |
3797 | ret = __extent_writepage(page, wbc, &epd); |
3798 | ||
ffbd517d | 3799 | flush_epd_write_bio(&epd); |
d1310b2e CM |
3800 | return ret; |
3801 | } | |
d1310b2e | 3802 | |
771ed689 CM |
3803 | int extent_write_locked_range(struct extent_io_tree *tree, struct inode *inode, |
3804 | u64 start, u64 end, get_extent_t *get_extent, | |
3805 | int mode) | |
3806 | { | |
3807 | int ret = 0; | |
3808 | struct address_space *mapping = inode->i_mapping; | |
3809 | struct page *page; | |
3810 | unsigned long nr_pages = (end - start + PAGE_CACHE_SIZE) >> | |
3811 | PAGE_CACHE_SHIFT; | |
3812 | ||
3813 | struct extent_page_data epd = { | |
3814 | .bio = NULL, | |
3815 | .tree = tree, | |
3816 | .get_extent = get_extent, | |
3817 | .extent_locked = 1, | |
ffbd517d | 3818 | .sync_io = mode == WB_SYNC_ALL, |
de0022b9 | 3819 | .bio_flags = 0, |
771ed689 CM |
3820 | }; |
3821 | struct writeback_control wbc_writepages = { | |
771ed689 | 3822 | .sync_mode = mode, |
771ed689 CM |
3823 | .nr_to_write = nr_pages * 2, |
3824 | .range_start = start, | |
3825 | .range_end = end + 1, | |
3826 | }; | |
3827 | ||
d397712b | 3828 | while (start <= end) { |
771ed689 CM |
3829 | page = find_get_page(mapping, start >> PAGE_CACHE_SHIFT); |
3830 | if (clear_page_dirty_for_io(page)) | |
3831 | ret = __extent_writepage(page, &wbc_writepages, &epd); | |
3832 | else { | |
3833 | if (tree->ops && tree->ops->writepage_end_io_hook) | |
3834 | tree->ops->writepage_end_io_hook(page, start, | |
3835 | start + PAGE_CACHE_SIZE - 1, | |
3836 | NULL, 1); | |
3837 | unlock_page(page); | |
3838 | } | |
3839 | page_cache_release(page); | |
3840 | start += PAGE_CACHE_SIZE; | |
3841 | } | |
3842 | ||
ffbd517d | 3843 | flush_epd_write_bio(&epd); |
771ed689 CM |
3844 | return ret; |
3845 | } | |
d1310b2e CM |
3846 | |
3847 | int extent_writepages(struct extent_io_tree *tree, | |
3848 | struct address_space *mapping, | |
3849 | get_extent_t *get_extent, | |
3850 | struct writeback_control *wbc) | |
3851 | { | |
3852 | int ret = 0; | |
3853 | struct extent_page_data epd = { | |
3854 | .bio = NULL, | |
3855 | .tree = tree, | |
3856 | .get_extent = get_extent, | |
771ed689 | 3857 | .extent_locked = 0, |
ffbd517d | 3858 | .sync_io = wbc->sync_mode == WB_SYNC_ALL, |
de0022b9 | 3859 | .bio_flags = 0, |
d1310b2e CM |
3860 | }; |
3861 | ||
4bef0848 | 3862 | ret = extent_write_cache_pages(tree, mapping, wbc, |
d2c3f4f6 CM |
3863 | __extent_writepage, &epd, |
3864 | flush_write_bio); | |
ffbd517d | 3865 | flush_epd_write_bio(&epd); |
d1310b2e CM |
3866 | return ret; |
3867 | } | |
d1310b2e CM |
3868 | |
3869 | int extent_readpages(struct extent_io_tree *tree, | |
3870 | struct address_space *mapping, | |
3871 | struct list_head *pages, unsigned nr_pages, | |
3872 | get_extent_t get_extent) | |
3873 | { | |
3874 | struct bio *bio = NULL; | |
3875 | unsigned page_idx; | |
c8b97818 | 3876 | unsigned long bio_flags = 0; |
67c9684f LB |
3877 | struct page *pagepool[16]; |
3878 | struct page *page; | |
125bac01 | 3879 | struct extent_map *em_cached = NULL; |
67c9684f | 3880 | int nr = 0; |
d1310b2e | 3881 | |
d1310b2e | 3882 | for (page_idx = 0; page_idx < nr_pages; page_idx++) { |
67c9684f | 3883 | page = list_entry(pages->prev, struct page, lru); |
d1310b2e CM |
3884 | |
3885 | prefetchw(&page->flags); | |
3886 | list_del(&page->lru); | |
67c9684f | 3887 | if (add_to_page_cache_lru(page, mapping, |
43e817a1 | 3888 | page->index, GFP_NOFS)) { |
67c9684f LB |
3889 | page_cache_release(page); |
3890 | continue; | |
d1310b2e | 3891 | } |
67c9684f LB |
3892 | |
3893 | pagepool[nr++] = page; | |
3894 | if (nr < ARRAY_SIZE(pagepool)) | |
3895 | continue; | |
125bac01 | 3896 | __extent_readpages(tree, pagepool, nr, get_extent, &em_cached, |
9974090b | 3897 | &bio, 0, &bio_flags, READ); |
67c9684f | 3898 | nr = 0; |
d1310b2e | 3899 | } |
9974090b | 3900 | if (nr) |
125bac01 | 3901 | __extent_readpages(tree, pagepool, nr, get_extent, &em_cached, |
9974090b | 3902 | &bio, 0, &bio_flags, READ); |
67c9684f | 3903 | |
125bac01 MX |
3904 | if (em_cached) |
3905 | free_extent_map(em_cached); | |
3906 | ||
d1310b2e CM |
3907 | BUG_ON(!list_empty(pages)); |
3908 | if (bio) | |
79787eaa | 3909 | return submit_one_bio(READ, bio, 0, bio_flags); |
d1310b2e CM |
3910 | return 0; |
3911 | } | |
d1310b2e CM |
3912 | |
3913 | /* | |
3914 | * basic invalidatepage code, this waits on any locked or writeback | |
3915 | * ranges corresponding to the page, and then deletes any extent state | |
3916 | * records from the tree | |
3917 | */ | |
3918 | int extent_invalidatepage(struct extent_io_tree *tree, | |
3919 | struct page *page, unsigned long offset) | |
3920 | { | |
2ac55d41 | 3921 | struct extent_state *cached_state = NULL; |
4eee4fa4 | 3922 | u64 start = page_offset(page); |
d1310b2e CM |
3923 | u64 end = start + PAGE_CACHE_SIZE - 1; |
3924 | size_t blocksize = page->mapping->host->i_sb->s_blocksize; | |
3925 | ||
fda2832f | 3926 | start += ALIGN(offset, blocksize); |
d1310b2e CM |
3927 | if (start > end) |
3928 | return 0; | |
3929 | ||
d0082371 | 3930 | lock_extent_bits(tree, start, end, 0, &cached_state); |
1edbb734 | 3931 | wait_on_page_writeback(page); |
d1310b2e | 3932 | clear_extent_bit(tree, start, end, |
32c00aff JB |
3933 | EXTENT_LOCKED | EXTENT_DIRTY | EXTENT_DELALLOC | |
3934 | EXTENT_DO_ACCOUNTING, | |
2ac55d41 | 3935 | 1, 1, &cached_state, GFP_NOFS); |
d1310b2e CM |
3936 | return 0; |
3937 | } | |
d1310b2e | 3938 | |
7b13b7b1 CM |
3939 | /* |
3940 | * a helper for releasepage, this tests for areas of the page that | |
3941 | * are locked or under IO and drops the related state bits if it is safe | |
3942 | * to drop the page. | |
3943 | */ | |
48a3b636 ES |
3944 | static int try_release_extent_state(struct extent_map_tree *map, |
3945 | struct extent_io_tree *tree, | |
3946 | struct page *page, gfp_t mask) | |
7b13b7b1 | 3947 | { |
4eee4fa4 | 3948 | u64 start = page_offset(page); |
7b13b7b1 CM |
3949 | u64 end = start + PAGE_CACHE_SIZE - 1; |
3950 | int ret = 1; | |
3951 | ||
211f90e6 | 3952 | if (test_range_bit(tree, start, end, |
8b62b72b | 3953 | EXTENT_IOBITS, 0, NULL)) |
7b13b7b1 CM |
3954 | ret = 0; |
3955 | else { | |
3956 | if ((mask & GFP_NOFS) == GFP_NOFS) | |
3957 | mask = GFP_NOFS; | |
11ef160f CM |
3958 | /* |
3959 | * at this point we can safely clear everything except the | |
3960 | * locked bit and the nodatasum bit | |
3961 | */ | |
e3f24cc5 | 3962 | ret = clear_extent_bit(tree, start, end, |
11ef160f CM |
3963 | ~(EXTENT_LOCKED | EXTENT_NODATASUM), |
3964 | 0, 0, NULL, mask); | |
e3f24cc5 CM |
3965 | |
3966 | /* if clear_extent_bit failed for enomem reasons, | |
3967 | * we can't allow the release to continue. | |
3968 | */ | |
3969 | if (ret < 0) | |
3970 | ret = 0; | |
3971 | else | |
3972 | ret = 1; | |
7b13b7b1 CM |
3973 | } |
3974 | return ret; | |
3975 | } | |
7b13b7b1 | 3976 | |
d1310b2e CM |
3977 | /* |
3978 | * a helper for releasepage. As long as there are no locked extents | |
3979 | * in the range corresponding to the page, both state records and extent | |
3980 | * map records are removed | |
3981 | */ | |
3982 | int try_release_extent_mapping(struct extent_map_tree *map, | |
70dec807 CM |
3983 | struct extent_io_tree *tree, struct page *page, |
3984 | gfp_t mask) | |
d1310b2e CM |
3985 | { |
3986 | struct extent_map *em; | |
4eee4fa4 | 3987 | u64 start = page_offset(page); |
d1310b2e | 3988 | u64 end = start + PAGE_CACHE_SIZE - 1; |
7b13b7b1 | 3989 | |
70dec807 CM |
3990 | if ((mask & __GFP_WAIT) && |
3991 | page->mapping->host->i_size > 16 * 1024 * 1024) { | |
39b5637f | 3992 | u64 len; |
70dec807 | 3993 | while (start <= end) { |
39b5637f | 3994 | len = end - start + 1; |
890871be | 3995 | write_lock(&map->lock); |
39b5637f | 3996 | em = lookup_extent_mapping(map, start, len); |
285190d9 | 3997 | if (!em) { |
890871be | 3998 | write_unlock(&map->lock); |
70dec807 CM |
3999 | break; |
4000 | } | |
7f3c74fb CM |
4001 | if (test_bit(EXTENT_FLAG_PINNED, &em->flags) || |
4002 | em->start != start) { | |
890871be | 4003 | write_unlock(&map->lock); |
70dec807 CM |
4004 | free_extent_map(em); |
4005 | break; | |
4006 | } | |
4007 | if (!test_range_bit(tree, em->start, | |
4008 | extent_map_end(em) - 1, | |
8b62b72b | 4009 | EXTENT_LOCKED | EXTENT_WRITEBACK, |
9655d298 | 4010 | 0, NULL)) { |
70dec807 CM |
4011 | remove_extent_mapping(map, em); |
4012 | /* once for the rb tree */ | |
4013 | free_extent_map(em); | |
4014 | } | |
4015 | start = extent_map_end(em); | |
890871be | 4016 | write_unlock(&map->lock); |
70dec807 CM |
4017 | |
4018 | /* once for us */ | |
d1310b2e CM |
4019 | free_extent_map(em); |
4020 | } | |
d1310b2e | 4021 | } |
7b13b7b1 | 4022 | return try_release_extent_state(map, tree, page, mask); |
d1310b2e | 4023 | } |
d1310b2e | 4024 | |
ec29ed5b CM |
4025 | /* |
4026 | * helper function for fiemap, which doesn't want to see any holes. | |
4027 | * This maps until we find something past 'last' | |
4028 | */ | |
4029 | static struct extent_map *get_extent_skip_holes(struct inode *inode, | |
4030 | u64 offset, | |
4031 | u64 last, | |
4032 | get_extent_t *get_extent) | |
4033 | { | |
4034 | u64 sectorsize = BTRFS_I(inode)->root->sectorsize; | |
4035 | struct extent_map *em; | |
4036 | u64 len; | |
4037 | ||
4038 | if (offset >= last) | |
4039 | return NULL; | |
4040 | ||
4041 | while(1) { | |
4042 | len = last - offset; | |
4043 | if (len == 0) | |
4044 | break; | |
fda2832f | 4045 | len = ALIGN(len, sectorsize); |
ec29ed5b | 4046 | em = get_extent(inode, NULL, 0, offset, len, 0); |
c704005d | 4047 | if (IS_ERR_OR_NULL(em)) |
ec29ed5b CM |
4048 | return em; |
4049 | ||
4050 | /* if this isn't a hole return it */ | |
4051 | if (!test_bit(EXTENT_FLAG_VACANCY, &em->flags) && | |
4052 | em->block_start != EXTENT_MAP_HOLE) { | |
4053 | return em; | |
4054 | } | |
4055 | ||
4056 | /* this is a hole, advance to the next extent */ | |
4057 | offset = extent_map_end(em); | |
4058 | free_extent_map(em); | |
4059 | if (offset >= last) | |
4060 | break; | |
4061 | } | |
4062 | return NULL; | |
4063 | } | |
4064 | ||
fe09e16c LB |
4065 | static noinline int count_ext_ref(u64 inum, u64 offset, u64 root_id, void *ctx) |
4066 | { | |
4067 | unsigned long cnt = *((unsigned long *)ctx); | |
4068 | ||
4069 | cnt++; | |
4070 | *((unsigned long *)ctx) = cnt; | |
4071 | ||
4072 | /* Now we're sure that the extent is shared. */ | |
4073 | if (cnt > 1) | |
4074 | return 1; | |
4075 | return 0; | |
4076 | } | |
4077 | ||
1506fcc8 YS |
4078 | int extent_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, |
4079 | __u64 start, __u64 len, get_extent_t *get_extent) | |
4080 | { | |
975f84fe | 4081 | int ret = 0; |
1506fcc8 YS |
4082 | u64 off = start; |
4083 | u64 max = start + len; | |
4084 | u32 flags = 0; | |
975f84fe JB |
4085 | u32 found_type; |
4086 | u64 last; | |
ec29ed5b | 4087 | u64 last_for_get_extent = 0; |
1506fcc8 | 4088 | u64 disko = 0; |
ec29ed5b | 4089 | u64 isize = i_size_read(inode); |
975f84fe | 4090 | struct btrfs_key found_key; |
1506fcc8 | 4091 | struct extent_map *em = NULL; |
2ac55d41 | 4092 | struct extent_state *cached_state = NULL; |
975f84fe JB |
4093 | struct btrfs_path *path; |
4094 | struct btrfs_file_extent_item *item; | |
1506fcc8 | 4095 | int end = 0; |
ec29ed5b CM |
4096 | u64 em_start = 0; |
4097 | u64 em_len = 0; | |
4098 | u64 em_end = 0; | |
1506fcc8 | 4099 | unsigned long emflags; |
1506fcc8 YS |
4100 | |
4101 | if (len == 0) | |
4102 | return -EINVAL; | |
4103 | ||
975f84fe JB |
4104 | path = btrfs_alloc_path(); |
4105 | if (!path) | |
4106 | return -ENOMEM; | |
4107 | path->leave_spinning = 1; | |
4108 | ||
4d479cf0 JB |
4109 | start = ALIGN(start, BTRFS_I(inode)->root->sectorsize); |
4110 | len = ALIGN(len, BTRFS_I(inode)->root->sectorsize); | |
4111 | ||
ec29ed5b CM |
4112 | /* |
4113 | * lookup the last file extent. We're not using i_size here | |
4114 | * because there might be preallocation past i_size | |
4115 | */ | |
975f84fe | 4116 | ret = btrfs_lookup_file_extent(NULL, BTRFS_I(inode)->root, |
33345d01 | 4117 | path, btrfs_ino(inode), -1, 0); |
975f84fe JB |
4118 | if (ret < 0) { |
4119 | btrfs_free_path(path); | |
4120 | return ret; | |
4121 | } | |
4122 | WARN_ON(!ret); | |
4123 | path->slots[0]--; | |
4124 | item = btrfs_item_ptr(path->nodes[0], path->slots[0], | |
4125 | struct btrfs_file_extent_item); | |
4126 | btrfs_item_key_to_cpu(path->nodes[0], &found_key, path->slots[0]); | |
4127 | found_type = btrfs_key_type(&found_key); | |
4128 | ||
ec29ed5b | 4129 | /* No extents, but there might be delalloc bits */ |
33345d01 | 4130 | if (found_key.objectid != btrfs_ino(inode) || |
975f84fe | 4131 | found_type != BTRFS_EXTENT_DATA_KEY) { |
ec29ed5b CM |
4132 | /* have to trust i_size as the end */ |
4133 | last = (u64)-1; | |
4134 | last_for_get_extent = isize; | |
4135 | } else { | |
4136 | /* | |
4137 | * remember the start of the last extent. There are a | |
4138 | * bunch of different factors that go into the length of the | |
4139 | * extent, so its much less complex to remember where it started | |
4140 | */ | |
4141 | last = found_key.offset; | |
4142 | last_for_get_extent = last + 1; | |
975f84fe | 4143 | } |
fe09e16c | 4144 | btrfs_release_path(path); |
975f84fe | 4145 | |
ec29ed5b CM |
4146 | /* |
4147 | * we might have some extents allocated but more delalloc past those | |
4148 | * extents. so, we trust isize unless the start of the last extent is | |
4149 | * beyond isize | |
4150 | */ | |
4151 | if (last < isize) { | |
4152 | last = (u64)-1; | |
4153 | last_for_get_extent = isize; | |
4154 | } | |
4155 | ||
a52f4cd2 | 4156 | lock_extent_bits(&BTRFS_I(inode)->io_tree, start, start + len - 1, 0, |
d0082371 | 4157 | &cached_state); |
ec29ed5b | 4158 | |
4d479cf0 | 4159 | em = get_extent_skip_holes(inode, start, last_for_get_extent, |
ec29ed5b | 4160 | get_extent); |
1506fcc8 YS |
4161 | if (!em) |
4162 | goto out; | |
4163 | if (IS_ERR(em)) { | |
4164 | ret = PTR_ERR(em); | |
4165 | goto out; | |
4166 | } | |
975f84fe | 4167 | |
1506fcc8 | 4168 | while (!end) { |
b76bb701 | 4169 | u64 offset_in_extent = 0; |
ea8efc74 CM |
4170 | |
4171 | /* break if the extent we found is outside the range */ | |
4172 | if (em->start >= max || extent_map_end(em) < off) | |
4173 | break; | |
4174 | ||
4175 | /* | |
4176 | * get_extent may return an extent that starts before our | |
4177 | * requested range. We have to make sure the ranges | |
4178 | * we return to fiemap always move forward and don't | |
4179 | * overlap, so adjust the offsets here | |
4180 | */ | |
4181 | em_start = max(em->start, off); | |
1506fcc8 | 4182 | |
ea8efc74 CM |
4183 | /* |
4184 | * record the offset from the start of the extent | |
b76bb701 JB |
4185 | * for adjusting the disk offset below. Only do this if the |
4186 | * extent isn't compressed since our in ram offset may be past | |
4187 | * what we have actually allocated on disk. | |
ea8efc74 | 4188 | */ |
b76bb701 JB |
4189 | if (!test_bit(EXTENT_FLAG_COMPRESSED, &em->flags)) |
4190 | offset_in_extent = em_start - em->start; | |
ec29ed5b | 4191 | em_end = extent_map_end(em); |
ea8efc74 | 4192 | em_len = em_end - em_start; |
ec29ed5b | 4193 | emflags = em->flags; |
1506fcc8 YS |
4194 | disko = 0; |
4195 | flags = 0; | |
4196 | ||
ea8efc74 CM |
4197 | /* |
4198 | * bump off for our next call to get_extent | |
4199 | */ | |
4200 | off = extent_map_end(em); | |
4201 | if (off >= max) | |
4202 | end = 1; | |
4203 | ||
93dbfad7 | 4204 | if (em->block_start == EXTENT_MAP_LAST_BYTE) { |
1506fcc8 YS |
4205 | end = 1; |
4206 | flags |= FIEMAP_EXTENT_LAST; | |
93dbfad7 | 4207 | } else if (em->block_start == EXTENT_MAP_INLINE) { |
1506fcc8 YS |
4208 | flags |= (FIEMAP_EXTENT_DATA_INLINE | |
4209 | FIEMAP_EXTENT_NOT_ALIGNED); | |
93dbfad7 | 4210 | } else if (em->block_start == EXTENT_MAP_DELALLOC) { |
1506fcc8 YS |
4211 | flags |= (FIEMAP_EXTENT_DELALLOC | |
4212 | FIEMAP_EXTENT_UNKNOWN); | |
93dbfad7 | 4213 | } else { |
fe09e16c LB |
4214 | unsigned long ref_cnt = 0; |
4215 | ||
ea8efc74 | 4216 | disko = em->block_start + offset_in_extent; |
fe09e16c LB |
4217 | |
4218 | /* | |
4219 | * As btrfs supports shared space, this information | |
4220 | * can be exported to userspace tools via | |
4221 | * flag FIEMAP_EXTENT_SHARED. | |
4222 | */ | |
4223 | ret = iterate_inodes_from_logical( | |
4224 | em->block_start, | |
4225 | BTRFS_I(inode)->root->fs_info, | |
4226 | path, count_ext_ref, &ref_cnt); | |
4227 | if (ret < 0 && ret != -ENOENT) | |
4228 | goto out_free; | |
4229 | ||
4230 | if (ref_cnt > 1) | |
4231 | flags |= FIEMAP_EXTENT_SHARED; | |
1506fcc8 YS |
4232 | } |
4233 | if (test_bit(EXTENT_FLAG_COMPRESSED, &em->flags)) | |
4234 | flags |= FIEMAP_EXTENT_ENCODED; | |
4235 | ||
1506fcc8 YS |
4236 | free_extent_map(em); |
4237 | em = NULL; | |
ec29ed5b CM |
4238 | if ((em_start >= last) || em_len == (u64)-1 || |
4239 | (last == (u64)-1 && isize <= em_end)) { | |
1506fcc8 YS |
4240 | flags |= FIEMAP_EXTENT_LAST; |
4241 | end = 1; | |
4242 | } | |
4243 | ||
ec29ed5b CM |
4244 | /* now scan forward to see if this is really the last extent. */ |
4245 | em = get_extent_skip_holes(inode, off, last_for_get_extent, | |
4246 | get_extent); | |
4247 | if (IS_ERR(em)) { | |
4248 | ret = PTR_ERR(em); | |
4249 | goto out; | |
4250 | } | |
4251 | if (!em) { | |
975f84fe JB |
4252 | flags |= FIEMAP_EXTENT_LAST; |
4253 | end = 1; | |
4254 | } | |
ec29ed5b CM |
4255 | ret = fiemap_fill_next_extent(fieinfo, em_start, disko, |
4256 | em_len, flags); | |
4257 | if (ret) | |
4258 | goto out_free; | |
1506fcc8 YS |
4259 | } |
4260 | out_free: | |
4261 | free_extent_map(em); | |
4262 | out: | |
fe09e16c | 4263 | btrfs_free_path(path); |
a52f4cd2 | 4264 | unlock_extent_cached(&BTRFS_I(inode)->io_tree, start, start + len - 1, |
2ac55d41 | 4265 | &cached_state, GFP_NOFS); |
1506fcc8 YS |
4266 | return ret; |
4267 | } | |
4268 | ||
727011e0 CM |
4269 | static void __free_extent_buffer(struct extent_buffer *eb) |
4270 | { | |
6d49ba1b | 4271 | btrfs_leak_debug_del(&eb->leak_list); |
727011e0 CM |
4272 | kmem_cache_free(extent_buffer_cache, eb); |
4273 | } | |
4274 | ||
db7f3436 JB |
4275 | static int extent_buffer_under_io(struct extent_buffer *eb) |
4276 | { | |
4277 | return (atomic_read(&eb->io_pages) || | |
4278 | test_bit(EXTENT_BUFFER_WRITEBACK, &eb->bflags) || | |
4279 | test_bit(EXTENT_BUFFER_DIRTY, &eb->bflags)); | |
4280 | } | |
4281 | ||
4282 | /* | |
4283 | * Helper for releasing extent buffer page. | |
4284 | */ | |
4285 | static void btrfs_release_extent_buffer_page(struct extent_buffer *eb, | |
4286 | unsigned long start_idx) | |
4287 | { | |
4288 | unsigned long index; | |
4289 | unsigned long num_pages; | |
4290 | struct page *page; | |
4291 | int mapped = !test_bit(EXTENT_BUFFER_DUMMY, &eb->bflags); | |
4292 | ||
4293 | BUG_ON(extent_buffer_under_io(eb)); | |
4294 | ||
4295 | num_pages = num_extent_pages(eb->start, eb->len); | |
4296 | index = start_idx + num_pages; | |
4297 | if (start_idx >= index) | |
4298 | return; | |
4299 | ||
4300 | do { | |
4301 | index--; | |
4302 | page = extent_buffer_page(eb, index); | |
4303 | if (page && mapped) { | |
4304 | spin_lock(&page->mapping->private_lock); | |
4305 | /* | |
4306 | * We do this since we'll remove the pages after we've | |
4307 | * removed the eb from the radix tree, so we could race | |
4308 | * and have this page now attached to the new eb. So | |
4309 | * only clear page_private if it's still connected to | |
4310 | * this eb. | |
4311 | */ | |
4312 | if (PagePrivate(page) && | |
4313 | page->private == (unsigned long)eb) { | |
4314 | BUG_ON(test_bit(EXTENT_BUFFER_DIRTY, &eb->bflags)); | |
4315 | BUG_ON(PageDirty(page)); | |
4316 | BUG_ON(PageWriteback(page)); | |
4317 | /* | |
4318 | * We need to make sure we haven't be attached | |
4319 | * to a new eb. | |
4320 | */ | |
4321 | ClearPagePrivate(page); | |
4322 | set_page_private(page, 0); | |
4323 | /* One for the page private */ | |
4324 | page_cache_release(page); | |
4325 | } | |
4326 | spin_unlock(&page->mapping->private_lock); | |
4327 | ||
4328 | } | |
4329 | if (page) { | |
4330 | /* One for when we alloced the page */ | |
4331 | page_cache_release(page); | |
4332 | } | |
4333 | } while (index != start_idx); | |
4334 | } | |
4335 | ||
4336 | /* | |
4337 | * Helper for releasing the extent buffer. | |
4338 | */ | |
4339 | static inline void btrfs_release_extent_buffer(struct extent_buffer *eb) | |
4340 | { | |
4341 | btrfs_release_extent_buffer_page(eb, 0); | |
4342 | __free_extent_buffer(eb); | |
4343 | } | |
4344 | ||
d1310b2e CM |
4345 | static struct extent_buffer *__alloc_extent_buffer(struct extent_io_tree *tree, |
4346 | u64 start, | |
4347 | unsigned long len, | |
4348 | gfp_t mask) | |
4349 | { | |
4350 | struct extent_buffer *eb = NULL; | |
4351 | ||
d1310b2e | 4352 | eb = kmem_cache_zalloc(extent_buffer_cache, mask); |
91ca338d TI |
4353 | if (eb == NULL) |
4354 | return NULL; | |
d1310b2e CM |
4355 | eb->start = start; |
4356 | eb->len = len; | |
4f2de97a | 4357 | eb->tree = tree; |
815a51c7 | 4358 | eb->bflags = 0; |
bd681513 CM |
4359 | rwlock_init(&eb->lock); |
4360 | atomic_set(&eb->write_locks, 0); | |
4361 | atomic_set(&eb->read_locks, 0); | |
4362 | atomic_set(&eb->blocking_readers, 0); | |
4363 | atomic_set(&eb->blocking_writers, 0); | |
4364 | atomic_set(&eb->spinning_readers, 0); | |
4365 | atomic_set(&eb->spinning_writers, 0); | |
5b25f70f | 4366 | eb->lock_nested = 0; |
bd681513 CM |
4367 | init_waitqueue_head(&eb->write_lock_wq); |
4368 | init_waitqueue_head(&eb->read_lock_wq); | |
b4ce94de | 4369 | |
6d49ba1b ES |
4370 | btrfs_leak_debug_add(&eb->leak_list, &buffers); |
4371 | ||
3083ee2e | 4372 | spin_lock_init(&eb->refs_lock); |
d1310b2e | 4373 | atomic_set(&eb->refs, 1); |
0b32f4bb | 4374 | atomic_set(&eb->io_pages, 0); |
727011e0 | 4375 | |
b8dae313 DS |
4376 | /* |
4377 | * Sanity checks, currently the maximum is 64k covered by 16x 4k pages | |
4378 | */ | |
4379 | BUILD_BUG_ON(BTRFS_MAX_METADATA_BLOCKSIZE | |
4380 | > MAX_INLINE_EXTENT_BUFFER_SIZE); | |
4381 | BUG_ON(len > MAX_INLINE_EXTENT_BUFFER_SIZE); | |
d1310b2e CM |
4382 | |
4383 | return eb; | |
4384 | } | |
4385 | ||
815a51c7 JS |
4386 | struct extent_buffer *btrfs_clone_extent_buffer(struct extent_buffer *src) |
4387 | { | |
4388 | unsigned long i; | |
4389 | struct page *p; | |
4390 | struct extent_buffer *new; | |
4391 | unsigned long num_pages = num_extent_pages(src->start, src->len); | |
4392 | ||
9ec72677 | 4393 | new = __alloc_extent_buffer(NULL, src->start, src->len, GFP_NOFS); |
815a51c7 JS |
4394 | if (new == NULL) |
4395 | return NULL; | |
4396 | ||
4397 | for (i = 0; i < num_pages; i++) { | |
9ec72677 | 4398 | p = alloc_page(GFP_NOFS); |
db7f3436 JB |
4399 | if (!p) { |
4400 | btrfs_release_extent_buffer(new); | |
4401 | return NULL; | |
4402 | } | |
815a51c7 JS |
4403 | attach_extent_buffer_page(new, p); |
4404 | WARN_ON(PageDirty(p)); | |
4405 | SetPageUptodate(p); | |
4406 | new->pages[i] = p; | |
4407 | } | |
4408 | ||
4409 | copy_extent_buffer(new, src, 0, 0, src->len); | |
4410 | set_bit(EXTENT_BUFFER_UPTODATE, &new->bflags); | |
4411 | set_bit(EXTENT_BUFFER_DUMMY, &new->bflags); | |
4412 | ||
4413 | return new; | |
4414 | } | |
4415 | ||
4416 | struct extent_buffer *alloc_dummy_extent_buffer(u64 start, unsigned long len) | |
4417 | { | |
4418 | struct extent_buffer *eb; | |
4419 | unsigned long num_pages = num_extent_pages(0, len); | |
4420 | unsigned long i; | |
4421 | ||
9ec72677 | 4422 | eb = __alloc_extent_buffer(NULL, start, len, GFP_NOFS); |
815a51c7 JS |
4423 | if (!eb) |
4424 | return NULL; | |
4425 | ||
4426 | for (i = 0; i < num_pages; i++) { | |
9ec72677 | 4427 | eb->pages[i] = alloc_page(GFP_NOFS); |
815a51c7 JS |
4428 | if (!eb->pages[i]) |
4429 | goto err; | |
4430 | } | |
4431 | set_extent_buffer_uptodate(eb); | |
4432 | btrfs_set_header_nritems(eb, 0); | |
4433 | set_bit(EXTENT_BUFFER_DUMMY, &eb->bflags); | |
4434 | ||
4435 | return eb; | |
4436 | err: | |
84167d19 SB |
4437 | for (; i > 0; i--) |
4438 | __free_page(eb->pages[i - 1]); | |
815a51c7 JS |
4439 | __free_extent_buffer(eb); |
4440 | return NULL; | |
4441 | } | |
4442 | ||
0b32f4bb JB |
4443 | static void check_buffer_tree_ref(struct extent_buffer *eb) |
4444 | { | |
242e18c7 | 4445 | int refs; |
0b32f4bb JB |
4446 | /* the ref bit is tricky. We have to make sure it is set |
4447 | * if we have the buffer dirty. Otherwise the | |
4448 | * code to free a buffer can end up dropping a dirty | |
4449 | * page | |
4450 | * | |
4451 | * Once the ref bit is set, it won't go away while the | |
4452 | * buffer is dirty or in writeback, and it also won't | |
4453 | * go away while we have the reference count on the | |
4454 | * eb bumped. | |
4455 | * | |
4456 | * We can't just set the ref bit without bumping the | |
4457 | * ref on the eb because free_extent_buffer might | |
4458 | * see the ref bit and try to clear it. If this happens | |
4459 | * free_extent_buffer might end up dropping our original | |
4460 | * ref by mistake and freeing the page before we are able | |
4461 | * to add one more ref. | |
4462 | * | |
4463 | * So bump the ref count first, then set the bit. If someone | |
4464 | * beat us to it, drop the ref we added. | |
4465 | */ | |
242e18c7 CM |
4466 | refs = atomic_read(&eb->refs); |
4467 | if (refs >= 2 && test_bit(EXTENT_BUFFER_TREE_REF, &eb->bflags)) | |
4468 | return; | |
4469 | ||
594831c4 JB |
4470 | spin_lock(&eb->refs_lock); |
4471 | if (!test_and_set_bit(EXTENT_BUFFER_TREE_REF, &eb->bflags)) | |
0b32f4bb | 4472 | atomic_inc(&eb->refs); |
594831c4 | 4473 | spin_unlock(&eb->refs_lock); |
0b32f4bb JB |
4474 | } |
4475 | ||
5df4235e JB |
4476 | static void mark_extent_buffer_accessed(struct extent_buffer *eb) |
4477 | { | |
4478 | unsigned long num_pages, i; | |
4479 | ||
0b32f4bb JB |
4480 | check_buffer_tree_ref(eb); |
4481 | ||
5df4235e JB |
4482 | num_pages = num_extent_pages(eb->start, eb->len); |
4483 | for (i = 0; i < num_pages; i++) { | |
4484 | struct page *p = extent_buffer_page(eb, i); | |
4485 | mark_page_accessed(p); | |
4486 | } | |
4487 | } | |
4488 | ||
d1310b2e | 4489 | struct extent_buffer *alloc_extent_buffer(struct extent_io_tree *tree, |
727011e0 | 4490 | u64 start, unsigned long len) |
d1310b2e CM |
4491 | { |
4492 | unsigned long num_pages = num_extent_pages(start, len); | |
4493 | unsigned long i; | |
4494 | unsigned long index = start >> PAGE_CACHE_SHIFT; | |
4495 | struct extent_buffer *eb; | |
6af118ce | 4496 | struct extent_buffer *exists = NULL; |
d1310b2e CM |
4497 | struct page *p; |
4498 | struct address_space *mapping = tree->mapping; | |
4499 | int uptodate = 1; | |
19fe0a8b | 4500 | int ret; |
d1310b2e | 4501 | |
19fe0a8b MX |
4502 | rcu_read_lock(); |
4503 | eb = radix_tree_lookup(&tree->buffer, start >> PAGE_CACHE_SHIFT); | |
4504 | if (eb && atomic_inc_not_zero(&eb->refs)) { | |
4505 | rcu_read_unlock(); | |
5df4235e | 4506 | mark_extent_buffer_accessed(eb); |
6af118ce CM |
4507 | return eb; |
4508 | } | |
19fe0a8b | 4509 | rcu_read_unlock(); |
6af118ce | 4510 | |
ba144192 | 4511 | eb = __alloc_extent_buffer(tree, start, len, GFP_NOFS); |
2b114d1d | 4512 | if (!eb) |
d1310b2e CM |
4513 | return NULL; |
4514 | ||
727011e0 | 4515 | for (i = 0; i < num_pages; i++, index++) { |
a6591715 | 4516 | p = find_or_create_page(mapping, index, GFP_NOFS); |
4804b382 | 4517 | if (!p) |
6af118ce | 4518 | goto free_eb; |
4f2de97a JB |
4519 | |
4520 | spin_lock(&mapping->private_lock); | |
4521 | if (PagePrivate(p)) { | |
4522 | /* | |
4523 | * We could have already allocated an eb for this page | |
4524 | * and attached one so lets see if we can get a ref on | |
4525 | * the existing eb, and if we can we know it's good and | |
4526 | * we can just return that one, else we know we can just | |
4527 | * overwrite page->private. | |
4528 | */ | |
4529 | exists = (struct extent_buffer *)p->private; | |
4530 | if (atomic_inc_not_zero(&exists->refs)) { | |
4531 | spin_unlock(&mapping->private_lock); | |
4532 | unlock_page(p); | |
17de39ac | 4533 | page_cache_release(p); |
5df4235e | 4534 | mark_extent_buffer_accessed(exists); |
4f2de97a JB |
4535 | goto free_eb; |
4536 | } | |
4537 | ||
0b32f4bb | 4538 | /* |
4f2de97a JB |
4539 | * Do this so attach doesn't complain and we need to |
4540 | * drop the ref the old guy had. | |
4541 | */ | |
4542 | ClearPagePrivate(p); | |
0b32f4bb | 4543 | WARN_ON(PageDirty(p)); |
4f2de97a | 4544 | page_cache_release(p); |
d1310b2e | 4545 | } |
4f2de97a JB |
4546 | attach_extent_buffer_page(eb, p); |
4547 | spin_unlock(&mapping->private_lock); | |
0b32f4bb | 4548 | WARN_ON(PageDirty(p)); |
d1310b2e | 4549 | mark_page_accessed(p); |
727011e0 | 4550 | eb->pages[i] = p; |
d1310b2e CM |
4551 | if (!PageUptodate(p)) |
4552 | uptodate = 0; | |
eb14ab8e CM |
4553 | |
4554 | /* | |
4555 | * see below about how we avoid a nasty race with release page | |
4556 | * and why we unlock later | |
4557 | */ | |
d1310b2e CM |
4558 | } |
4559 | if (uptodate) | |
b4ce94de | 4560 | set_bit(EXTENT_BUFFER_UPTODATE, &eb->bflags); |
115391d2 | 4561 | again: |
19fe0a8b MX |
4562 | ret = radix_tree_preload(GFP_NOFS & ~__GFP_HIGHMEM); |
4563 | if (ret) | |
4564 | goto free_eb; | |
4565 | ||
6af118ce | 4566 | spin_lock(&tree->buffer_lock); |
19fe0a8b MX |
4567 | ret = radix_tree_insert(&tree->buffer, start >> PAGE_CACHE_SHIFT, eb); |
4568 | if (ret == -EEXIST) { | |
4569 | exists = radix_tree_lookup(&tree->buffer, | |
4570 | start >> PAGE_CACHE_SHIFT); | |
115391d2 JB |
4571 | if (!atomic_inc_not_zero(&exists->refs)) { |
4572 | spin_unlock(&tree->buffer_lock); | |
4573 | radix_tree_preload_end(); | |
115391d2 JB |
4574 | exists = NULL; |
4575 | goto again; | |
4576 | } | |
6af118ce | 4577 | spin_unlock(&tree->buffer_lock); |
19fe0a8b | 4578 | radix_tree_preload_end(); |
5df4235e | 4579 | mark_extent_buffer_accessed(exists); |
6af118ce CM |
4580 | goto free_eb; |
4581 | } | |
6af118ce | 4582 | /* add one reference for the tree */ |
0b32f4bb | 4583 | check_buffer_tree_ref(eb); |
f044ba78 | 4584 | spin_unlock(&tree->buffer_lock); |
19fe0a8b | 4585 | radix_tree_preload_end(); |
eb14ab8e CM |
4586 | |
4587 | /* | |
4588 | * there is a race where release page may have | |
4589 | * tried to find this extent buffer in the radix | |
4590 | * but failed. It will tell the VM it is safe to | |
4591 | * reclaim the, and it will clear the page private bit. | |
4592 | * We must make sure to set the page private bit properly | |
4593 | * after the extent buffer is in the radix tree so | |
4594 | * it doesn't get lost | |
4595 | */ | |
727011e0 CM |
4596 | SetPageChecked(eb->pages[0]); |
4597 | for (i = 1; i < num_pages; i++) { | |
4598 | p = extent_buffer_page(eb, i); | |
727011e0 CM |
4599 | ClearPageChecked(p); |
4600 | unlock_page(p); | |
4601 | } | |
4602 | unlock_page(eb->pages[0]); | |
d1310b2e CM |
4603 | return eb; |
4604 | ||
6af118ce | 4605 | free_eb: |
727011e0 CM |
4606 | for (i = 0; i < num_pages; i++) { |
4607 | if (eb->pages[i]) | |
4608 | unlock_page(eb->pages[i]); | |
4609 | } | |
eb14ab8e | 4610 | |
17de39ac | 4611 | WARN_ON(!atomic_dec_and_test(&eb->refs)); |
897ca6e9 | 4612 | btrfs_release_extent_buffer(eb); |
6af118ce | 4613 | return exists; |
d1310b2e | 4614 | } |
d1310b2e CM |
4615 | |
4616 | struct extent_buffer *find_extent_buffer(struct extent_io_tree *tree, | |
f09d1f60 | 4617 | u64 start, unsigned long len) |
d1310b2e | 4618 | { |
d1310b2e | 4619 | struct extent_buffer *eb; |
d1310b2e | 4620 | |
19fe0a8b MX |
4621 | rcu_read_lock(); |
4622 | eb = radix_tree_lookup(&tree->buffer, start >> PAGE_CACHE_SHIFT); | |
4623 | if (eb && atomic_inc_not_zero(&eb->refs)) { | |
4624 | rcu_read_unlock(); | |
5df4235e | 4625 | mark_extent_buffer_accessed(eb); |
19fe0a8b MX |
4626 | return eb; |
4627 | } | |
4628 | rcu_read_unlock(); | |
0f9dd46c | 4629 | |
19fe0a8b | 4630 | return NULL; |
d1310b2e | 4631 | } |
d1310b2e | 4632 | |
3083ee2e JB |
4633 | static inline void btrfs_release_extent_buffer_rcu(struct rcu_head *head) |
4634 | { | |
4635 | struct extent_buffer *eb = | |
4636 | container_of(head, struct extent_buffer, rcu_head); | |
4637 | ||
4638 | __free_extent_buffer(eb); | |
4639 | } | |
4640 | ||
3083ee2e | 4641 | /* Expects to have eb->eb_lock already held */ |
f7a52a40 | 4642 | static int release_extent_buffer(struct extent_buffer *eb) |
3083ee2e JB |
4643 | { |
4644 | WARN_ON(atomic_read(&eb->refs) == 0); | |
4645 | if (atomic_dec_and_test(&eb->refs)) { | |
815a51c7 JS |
4646 | if (test_bit(EXTENT_BUFFER_DUMMY, &eb->bflags)) { |
4647 | spin_unlock(&eb->refs_lock); | |
4648 | } else { | |
4649 | struct extent_io_tree *tree = eb->tree; | |
3083ee2e | 4650 | |
815a51c7 | 4651 | spin_unlock(&eb->refs_lock); |
3083ee2e | 4652 | |
815a51c7 JS |
4653 | spin_lock(&tree->buffer_lock); |
4654 | radix_tree_delete(&tree->buffer, | |
4655 | eb->start >> PAGE_CACHE_SHIFT); | |
4656 | spin_unlock(&tree->buffer_lock); | |
4657 | } | |
3083ee2e JB |
4658 | |
4659 | /* Should be safe to release our pages at this point */ | |
4660 | btrfs_release_extent_buffer_page(eb, 0); | |
3083ee2e | 4661 | call_rcu(&eb->rcu_head, btrfs_release_extent_buffer_rcu); |
e64860aa | 4662 | return 1; |
3083ee2e JB |
4663 | } |
4664 | spin_unlock(&eb->refs_lock); | |
e64860aa JB |
4665 | |
4666 | return 0; | |
3083ee2e JB |
4667 | } |
4668 | ||
d1310b2e CM |
4669 | void free_extent_buffer(struct extent_buffer *eb) |
4670 | { | |
242e18c7 CM |
4671 | int refs; |
4672 | int old; | |
d1310b2e CM |
4673 | if (!eb) |
4674 | return; | |
4675 | ||
242e18c7 CM |
4676 | while (1) { |
4677 | refs = atomic_read(&eb->refs); | |
4678 | if (refs <= 3) | |
4679 | break; | |
4680 | old = atomic_cmpxchg(&eb->refs, refs, refs - 1); | |
4681 | if (old == refs) | |
4682 | return; | |
4683 | } | |
4684 | ||
3083ee2e | 4685 | spin_lock(&eb->refs_lock); |
815a51c7 JS |
4686 | if (atomic_read(&eb->refs) == 2 && |
4687 | test_bit(EXTENT_BUFFER_DUMMY, &eb->bflags)) | |
4688 | atomic_dec(&eb->refs); | |
4689 | ||
3083ee2e JB |
4690 | if (atomic_read(&eb->refs) == 2 && |
4691 | test_bit(EXTENT_BUFFER_STALE, &eb->bflags) && | |
0b32f4bb | 4692 | !extent_buffer_under_io(eb) && |
3083ee2e JB |
4693 | test_and_clear_bit(EXTENT_BUFFER_TREE_REF, &eb->bflags)) |
4694 | atomic_dec(&eb->refs); | |
4695 | ||
4696 | /* | |
4697 | * I know this is terrible, but it's temporary until we stop tracking | |
4698 | * the uptodate bits and such for the extent buffers. | |
4699 | */ | |
f7a52a40 | 4700 | release_extent_buffer(eb); |
3083ee2e JB |
4701 | } |
4702 | ||
4703 | void free_extent_buffer_stale(struct extent_buffer *eb) | |
4704 | { | |
4705 | if (!eb) | |
d1310b2e CM |
4706 | return; |
4707 | ||
3083ee2e JB |
4708 | spin_lock(&eb->refs_lock); |
4709 | set_bit(EXTENT_BUFFER_STALE, &eb->bflags); | |
4710 | ||
0b32f4bb | 4711 | if (atomic_read(&eb->refs) == 2 && !extent_buffer_under_io(eb) && |
3083ee2e JB |
4712 | test_and_clear_bit(EXTENT_BUFFER_TREE_REF, &eb->bflags)) |
4713 | atomic_dec(&eb->refs); | |
f7a52a40 | 4714 | release_extent_buffer(eb); |
d1310b2e | 4715 | } |
d1310b2e | 4716 | |
1d4284bd | 4717 | void clear_extent_buffer_dirty(struct extent_buffer *eb) |
d1310b2e | 4718 | { |
d1310b2e CM |
4719 | unsigned long i; |
4720 | unsigned long num_pages; | |
4721 | struct page *page; | |
4722 | ||
d1310b2e CM |
4723 | num_pages = num_extent_pages(eb->start, eb->len); |
4724 | ||
4725 | for (i = 0; i < num_pages; i++) { | |
4726 | page = extent_buffer_page(eb, i); | |
b9473439 | 4727 | if (!PageDirty(page)) |
d2c3f4f6 CM |
4728 | continue; |
4729 | ||
a61e6f29 | 4730 | lock_page(page); |
eb14ab8e CM |
4731 | WARN_ON(!PagePrivate(page)); |
4732 | ||
d1310b2e | 4733 | clear_page_dirty_for_io(page); |
0ee0fda0 | 4734 | spin_lock_irq(&page->mapping->tree_lock); |
d1310b2e CM |
4735 | if (!PageDirty(page)) { |
4736 | radix_tree_tag_clear(&page->mapping->page_tree, | |
4737 | page_index(page), | |
4738 | PAGECACHE_TAG_DIRTY); | |
4739 | } | |
0ee0fda0 | 4740 | spin_unlock_irq(&page->mapping->tree_lock); |
bf0da8c1 | 4741 | ClearPageError(page); |
a61e6f29 | 4742 | unlock_page(page); |
d1310b2e | 4743 | } |
0b32f4bb | 4744 | WARN_ON(atomic_read(&eb->refs) == 0); |
d1310b2e | 4745 | } |
d1310b2e | 4746 | |
0b32f4bb | 4747 | int set_extent_buffer_dirty(struct extent_buffer *eb) |
d1310b2e CM |
4748 | { |
4749 | unsigned long i; | |
4750 | unsigned long num_pages; | |
b9473439 | 4751 | int was_dirty = 0; |
d1310b2e | 4752 | |
0b32f4bb JB |
4753 | check_buffer_tree_ref(eb); |
4754 | ||
b9473439 | 4755 | was_dirty = test_and_set_bit(EXTENT_BUFFER_DIRTY, &eb->bflags); |
0b32f4bb | 4756 | |
d1310b2e | 4757 | num_pages = num_extent_pages(eb->start, eb->len); |
3083ee2e | 4758 | WARN_ON(atomic_read(&eb->refs) == 0); |
0b32f4bb JB |
4759 | WARN_ON(!test_bit(EXTENT_BUFFER_TREE_REF, &eb->bflags)); |
4760 | ||
b9473439 | 4761 | for (i = 0; i < num_pages; i++) |
0b32f4bb | 4762 | set_page_dirty(extent_buffer_page(eb, i)); |
b9473439 | 4763 | return was_dirty; |
d1310b2e | 4764 | } |
d1310b2e | 4765 | |
0b32f4bb | 4766 | int clear_extent_buffer_uptodate(struct extent_buffer *eb) |
1259ab75 CM |
4767 | { |
4768 | unsigned long i; | |
4769 | struct page *page; | |
4770 | unsigned long num_pages; | |
4771 | ||
b4ce94de | 4772 | clear_bit(EXTENT_BUFFER_UPTODATE, &eb->bflags); |
0b32f4bb | 4773 | num_pages = num_extent_pages(eb->start, eb->len); |
1259ab75 CM |
4774 | for (i = 0; i < num_pages; i++) { |
4775 | page = extent_buffer_page(eb, i); | |
33958dc6 CM |
4776 | if (page) |
4777 | ClearPageUptodate(page); | |
1259ab75 CM |
4778 | } |
4779 | return 0; | |
4780 | } | |
4781 | ||
0b32f4bb | 4782 | int set_extent_buffer_uptodate(struct extent_buffer *eb) |
d1310b2e CM |
4783 | { |
4784 | unsigned long i; | |
4785 | struct page *page; | |
4786 | unsigned long num_pages; | |
4787 | ||
0b32f4bb | 4788 | set_bit(EXTENT_BUFFER_UPTODATE, &eb->bflags); |
d1310b2e | 4789 | num_pages = num_extent_pages(eb->start, eb->len); |
d1310b2e CM |
4790 | for (i = 0; i < num_pages; i++) { |
4791 | page = extent_buffer_page(eb, i); | |
d1310b2e CM |
4792 | SetPageUptodate(page); |
4793 | } | |
4794 | return 0; | |
4795 | } | |
d1310b2e | 4796 | |
0b32f4bb | 4797 | int extent_buffer_uptodate(struct extent_buffer *eb) |
d1310b2e | 4798 | { |
0b32f4bb | 4799 | return test_bit(EXTENT_BUFFER_UPTODATE, &eb->bflags); |
d1310b2e | 4800 | } |
d1310b2e CM |
4801 | |
4802 | int read_extent_buffer_pages(struct extent_io_tree *tree, | |
bb82ab88 | 4803 | struct extent_buffer *eb, u64 start, int wait, |
f188591e | 4804 | get_extent_t *get_extent, int mirror_num) |
d1310b2e CM |
4805 | { |
4806 | unsigned long i; | |
4807 | unsigned long start_i; | |
4808 | struct page *page; | |
4809 | int err; | |
4810 | int ret = 0; | |
ce9adaa5 CM |
4811 | int locked_pages = 0; |
4812 | int all_uptodate = 1; | |
d1310b2e | 4813 | unsigned long num_pages; |
727011e0 | 4814 | unsigned long num_reads = 0; |
a86c12c7 | 4815 | struct bio *bio = NULL; |
c8b97818 | 4816 | unsigned long bio_flags = 0; |
a86c12c7 | 4817 | |
b4ce94de | 4818 | if (test_bit(EXTENT_BUFFER_UPTODATE, &eb->bflags)) |
d1310b2e CM |
4819 | return 0; |
4820 | ||
d1310b2e CM |
4821 | if (start) { |
4822 | WARN_ON(start < eb->start); | |
4823 | start_i = (start >> PAGE_CACHE_SHIFT) - | |
4824 | (eb->start >> PAGE_CACHE_SHIFT); | |
4825 | } else { | |
4826 | start_i = 0; | |
4827 | } | |
4828 | ||
4829 | num_pages = num_extent_pages(eb->start, eb->len); | |
4830 | for (i = start_i; i < num_pages; i++) { | |
4831 | page = extent_buffer_page(eb, i); | |
bb82ab88 | 4832 | if (wait == WAIT_NONE) { |
2db04966 | 4833 | if (!trylock_page(page)) |
ce9adaa5 | 4834 | goto unlock_exit; |
d1310b2e CM |
4835 | } else { |
4836 | lock_page(page); | |
4837 | } | |
ce9adaa5 | 4838 | locked_pages++; |
727011e0 CM |
4839 | if (!PageUptodate(page)) { |
4840 | num_reads++; | |
ce9adaa5 | 4841 | all_uptodate = 0; |
727011e0 | 4842 | } |
ce9adaa5 CM |
4843 | } |
4844 | if (all_uptodate) { | |
4845 | if (start_i == 0) | |
b4ce94de | 4846 | set_bit(EXTENT_BUFFER_UPTODATE, &eb->bflags); |
ce9adaa5 CM |
4847 | goto unlock_exit; |
4848 | } | |
4849 | ||
ea466794 | 4850 | clear_bit(EXTENT_BUFFER_IOERR, &eb->bflags); |
5cf1ab56 | 4851 | eb->read_mirror = 0; |
0b32f4bb | 4852 | atomic_set(&eb->io_pages, num_reads); |
ce9adaa5 CM |
4853 | for (i = start_i; i < num_pages; i++) { |
4854 | page = extent_buffer_page(eb, i); | |
ce9adaa5 | 4855 | if (!PageUptodate(page)) { |
f188591e | 4856 | ClearPageError(page); |
a86c12c7 | 4857 | err = __extent_read_full_page(tree, page, |
f188591e | 4858 | get_extent, &bio, |
d4c7ca86 JB |
4859 | mirror_num, &bio_flags, |
4860 | READ | REQ_META); | |
d397712b | 4861 | if (err) |
d1310b2e | 4862 | ret = err; |
d1310b2e CM |
4863 | } else { |
4864 | unlock_page(page); | |
4865 | } | |
4866 | } | |
4867 | ||
355808c2 | 4868 | if (bio) { |
d4c7ca86 JB |
4869 | err = submit_one_bio(READ | REQ_META, bio, mirror_num, |
4870 | bio_flags); | |
79787eaa JM |
4871 | if (err) |
4872 | return err; | |
355808c2 | 4873 | } |
a86c12c7 | 4874 | |
bb82ab88 | 4875 | if (ret || wait != WAIT_COMPLETE) |
d1310b2e | 4876 | return ret; |
d397712b | 4877 | |
d1310b2e CM |
4878 | for (i = start_i; i < num_pages; i++) { |
4879 | page = extent_buffer_page(eb, i); | |
4880 | wait_on_page_locked(page); | |
d397712b | 4881 | if (!PageUptodate(page)) |
d1310b2e | 4882 | ret = -EIO; |
d1310b2e | 4883 | } |
d397712b | 4884 | |
d1310b2e | 4885 | return ret; |
ce9adaa5 CM |
4886 | |
4887 | unlock_exit: | |
4888 | i = start_i; | |
d397712b | 4889 | while (locked_pages > 0) { |
ce9adaa5 CM |
4890 | page = extent_buffer_page(eb, i); |
4891 | i++; | |
4892 | unlock_page(page); | |
4893 | locked_pages--; | |
4894 | } | |
4895 | return ret; | |
d1310b2e | 4896 | } |
d1310b2e CM |
4897 | |
4898 | void read_extent_buffer(struct extent_buffer *eb, void *dstv, | |
4899 | unsigned long start, | |
4900 | unsigned long len) | |
4901 | { | |
4902 | size_t cur; | |
4903 | size_t offset; | |
4904 | struct page *page; | |
4905 | char *kaddr; | |
4906 | char *dst = (char *)dstv; | |
4907 | size_t start_offset = eb->start & ((u64)PAGE_CACHE_SIZE - 1); | |
4908 | unsigned long i = (start_offset + start) >> PAGE_CACHE_SHIFT; | |
d1310b2e CM |
4909 | |
4910 | WARN_ON(start > eb->len); | |
4911 | WARN_ON(start + len > eb->start + eb->len); | |
4912 | ||
778746b5 | 4913 | offset = (start_offset + start) & (PAGE_CACHE_SIZE - 1); |
d1310b2e | 4914 | |
d397712b | 4915 | while (len > 0) { |
d1310b2e | 4916 | page = extent_buffer_page(eb, i); |
d1310b2e CM |
4917 | |
4918 | cur = min(len, (PAGE_CACHE_SIZE - offset)); | |
a6591715 | 4919 | kaddr = page_address(page); |
d1310b2e | 4920 | memcpy(dst, kaddr + offset, cur); |
d1310b2e CM |
4921 | |
4922 | dst += cur; | |
4923 | len -= cur; | |
4924 | offset = 0; | |
4925 | i++; | |
4926 | } | |
4927 | } | |
d1310b2e CM |
4928 | |
4929 | int map_private_extent_buffer(struct extent_buffer *eb, unsigned long start, | |
a6591715 | 4930 | unsigned long min_len, char **map, |
d1310b2e | 4931 | unsigned long *map_start, |
a6591715 | 4932 | unsigned long *map_len) |
d1310b2e CM |
4933 | { |
4934 | size_t offset = start & (PAGE_CACHE_SIZE - 1); | |
4935 | char *kaddr; | |
4936 | struct page *p; | |
4937 | size_t start_offset = eb->start & ((u64)PAGE_CACHE_SIZE - 1); | |
4938 | unsigned long i = (start_offset + start) >> PAGE_CACHE_SHIFT; | |
4939 | unsigned long end_i = (start_offset + start + min_len - 1) >> | |
4940 | PAGE_CACHE_SHIFT; | |
4941 | ||
4942 | if (i != end_i) | |
4943 | return -EINVAL; | |
4944 | ||
4945 | if (i == 0) { | |
4946 | offset = start_offset; | |
4947 | *map_start = 0; | |
4948 | } else { | |
4949 | offset = 0; | |
4950 | *map_start = ((u64)i << PAGE_CACHE_SHIFT) - start_offset; | |
4951 | } | |
d397712b | 4952 | |
d1310b2e | 4953 | if (start + min_len > eb->len) { |
31b1a2bd | 4954 | WARN(1, KERN_ERR "btrfs bad mapping eb start %llu len %lu, " |
c1c9ff7c GU |
4955 | "wanted %lu %lu\n", |
4956 | eb->start, eb->len, start, min_len); | |
85026533 | 4957 | return -EINVAL; |
d1310b2e CM |
4958 | } |
4959 | ||
4960 | p = extent_buffer_page(eb, i); | |
a6591715 | 4961 | kaddr = page_address(p); |
d1310b2e CM |
4962 | *map = kaddr + offset; |
4963 | *map_len = PAGE_CACHE_SIZE - offset; | |
4964 | return 0; | |
4965 | } | |
d1310b2e | 4966 | |
d1310b2e CM |
4967 | int memcmp_extent_buffer(struct extent_buffer *eb, const void *ptrv, |
4968 | unsigned long start, | |
4969 | unsigned long len) | |
4970 | { | |
4971 | size_t cur; | |
4972 | size_t offset; | |
4973 | struct page *page; | |
4974 | char *kaddr; | |
4975 | char *ptr = (char *)ptrv; | |
4976 | size_t start_offset = eb->start & ((u64)PAGE_CACHE_SIZE - 1); | |
4977 | unsigned long i = (start_offset + start) >> PAGE_CACHE_SHIFT; | |
4978 | int ret = 0; | |
4979 | ||
4980 | WARN_ON(start > eb->len); | |
4981 | WARN_ON(start + len > eb->start + eb->len); | |
4982 | ||
778746b5 | 4983 | offset = (start_offset + start) & (PAGE_CACHE_SIZE - 1); |
d1310b2e | 4984 | |
d397712b | 4985 | while (len > 0) { |
d1310b2e | 4986 | page = extent_buffer_page(eb, i); |
d1310b2e CM |
4987 | |
4988 | cur = min(len, (PAGE_CACHE_SIZE - offset)); | |
4989 | ||
a6591715 | 4990 | kaddr = page_address(page); |
d1310b2e | 4991 | ret = memcmp(ptr, kaddr + offset, cur); |
d1310b2e CM |
4992 | if (ret) |
4993 | break; | |
4994 | ||
4995 | ptr += cur; | |
4996 | len -= cur; | |
4997 | offset = 0; | |
4998 | i++; | |
4999 | } | |
5000 | return ret; | |
5001 | } | |
d1310b2e CM |
5002 | |
5003 | void write_extent_buffer(struct extent_buffer *eb, const void *srcv, | |
5004 | unsigned long start, unsigned long len) | |
5005 | { | |
5006 | size_t cur; | |
5007 | size_t offset; | |
5008 | struct page *page; | |
5009 | char *kaddr; | |
5010 | char *src = (char *)srcv; | |
5011 | size_t start_offset = eb->start & ((u64)PAGE_CACHE_SIZE - 1); | |
5012 | unsigned long i = (start_offset + start) >> PAGE_CACHE_SHIFT; | |
5013 | ||
5014 | WARN_ON(start > eb->len); | |
5015 | WARN_ON(start + len > eb->start + eb->len); | |
5016 | ||
778746b5 | 5017 | offset = (start_offset + start) & (PAGE_CACHE_SIZE - 1); |
d1310b2e | 5018 | |
d397712b | 5019 | while (len > 0) { |
d1310b2e CM |
5020 | page = extent_buffer_page(eb, i); |
5021 | WARN_ON(!PageUptodate(page)); | |
5022 | ||
5023 | cur = min(len, PAGE_CACHE_SIZE - offset); | |
a6591715 | 5024 | kaddr = page_address(page); |
d1310b2e | 5025 | memcpy(kaddr + offset, src, cur); |
d1310b2e CM |
5026 | |
5027 | src += cur; | |
5028 | len -= cur; | |
5029 | offset = 0; | |
5030 | i++; | |
5031 | } | |
5032 | } | |
d1310b2e CM |
5033 | |
5034 | void memset_extent_buffer(struct extent_buffer *eb, char c, | |
5035 | unsigned long start, unsigned long len) | |
5036 | { | |
5037 | size_t cur; | |
5038 | size_t offset; | |
5039 | struct page *page; | |
5040 | char *kaddr; | |
5041 | size_t start_offset = eb->start & ((u64)PAGE_CACHE_SIZE - 1); | |
5042 | unsigned long i = (start_offset + start) >> PAGE_CACHE_SHIFT; | |
5043 | ||
5044 | WARN_ON(start > eb->len); | |
5045 | WARN_ON(start + len > eb->start + eb->len); | |
5046 | ||
778746b5 | 5047 | offset = (start_offset + start) & (PAGE_CACHE_SIZE - 1); |
d1310b2e | 5048 | |
d397712b | 5049 | while (len > 0) { |
d1310b2e CM |
5050 | page = extent_buffer_page(eb, i); |
5051 | WARN_ON(!PageUptodate(page)); | |
5052 | ||
5053 | cur = min(len, PAGE_CACHE_SIZE - offset); | |
a6591715 | 5054 | kaddr = page_address(page); |
d1310b2e | 5055 | memset(kaddr + offset, c, cur); |
d1310b2e CM |
5056 | |
5057 | len -= cur; | |
5058 | offset = 0; | |
5059 | i++; | |
5060 | } | |
5061 | } | |
d1310b2e CM |
5062 | |
5063 | void copy_extent_buffer(struct extent_buffer *dst, struct extent_buffer *src, | |
5064 | unsigned long dst_offset, unsigned long src_offset, | |
5065 | unsigned long len) | |
5066 | { | |
5067 | u64 dst_len = dst->len; | |
5068 | size_t cur; | |
5069 | size_t offset; | |
5070 | struct page *page; | |
5071 | char *kaddr; | |
5072 | size_t start_offset = dst->start & ((u64)PAGE_CACHE_SIZE - 1); | |
5073 | unsigned long i = (start_offset + dst_offset) >> PAGE_CACHE_SHIFT; | |
5074 | ||
5075 | WARN_ON(src->len != dst_len); | |
5076 | ||
5077 | offset = (start_offset + dst_offset) & | |
778746b5 | 5078 | (PAGE_CACHE_SIZE - 1); |
d1310b2e | 5079 | |
d397712b | 5080 | while (len > 0) { |
d1310b2e CM |
5081 | page = extent_buffer_page(dst, i); |
5082 | WARN_ON(!PageUptodate(page)); | |
5083 | ||
5084 | cur = min(len, (unsigned long)(PAGE_CACHE_SIZE - offset)); | |
5085 | ||
a6591715 | 5086 | kaddr = page_address(page); |
d1310b2e | 5087 | read_extent_buffer(src, kaddr + offset, src_offset, cur); |
d1310b2e CM |
5088 | |
5089 | src_offset += cur; | |
5090 | len -= cur; | |
5091 | offset = 0; | |
5092 | i++; | |
5093 | } | |
5094 | } | |
d1310b2e CM |
5095 | |
5096 | static void move_pages(struct page *dst_page, struct page *src_page, | |
5097 | unsigned long dst_off, unsigned long src_off, | |
5098 | unsigned long len) | |
5099 | { | |
a6591715 | 5100 | char *dst_kaddr = page_address(dst_page); |
d1310b2e CM |
5101 | if (dst_page == src_page) { |
5102 | memmove(dst_kaddr + dst_off, dst_kaddr + src_off, len); | |
5103 | } else { | |
a6591715 | 5104 | char *src_kaddr = page_address(src_page); |
d1310b2e CM |
5105 | char *p = dst_kaddr + dst_off + len; |
5106 | char *s = src_kaddr + src_off + len; | |
5107 | ||
5108 | while (len--) | |
5109 | *--p = *--s; | |
d1310b2e | 5110 | } |
d1310b2e CM |
5111 | } |
5112 | ||
3387206f ST |
5113 | static inline bool areas_overlap(unsigned long src, unsigned long dst, unsigned long len) |
5114 | { | |
5115 | unsigned long distance = (src > dst) ? src - dst : dst - src; | |
5116 | return distance < len; | |
5117 | } | |
5118 | ||
d1310b2e CM |
5119 | static void copy_pages(struct page *dst_page, struct page *src_page, |
5120 | unsigned long dst_off, unsigned long src_off, | |
5121 | unsigned long len) | |
5122 | { | |
a6591715 | 5123 | char *dst_kaddr = page_address(dst_page); |
d1310b2e | 5124 | char *src_kaddr; |
727011e0 | 5125 | int must_memmove = 0; |
d1310b2e | 5126 | |
3387206f | 5127 | if (dst_page != src_page) { |
a6591715 | 5128 | src_kaddr = page_address(src_page); |
3387206f | 5129 | } else { |
d1310b2e | 5130 | src_kaddr = dst_kaddr; |
727011e0 CM |
5131 | if (areas_overlap(src_off, dst_off, len)) |
5132 | must_memmove = 1; | |
3387206f | 5133 | } |
d1310b2e | 5134 | |
727011e0 CM |
5135 | if (must_memmove) |
5136 | memmove(dst_kaddr + dst_off, src_kaddr + src_off, len); | |
5137 | else | |
5138 | memcpy(dst_kaddr + dst_off, src_kaddr + src_off, len); | |
d1310b2e CM |
5139 | } |
5140 | ||
5141 | void memcpy_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset, | |
5142 | unsigned long src_offset, unsigned long len) | |
5143 | { | |
5144 | size_t cur; | |
5145 | size_t dst_off_in_page; | |
5146 | size_t src_off_in_page; | |
5147 | size_t start_offset = dst->start & ((u64)PAGE_CACHE_SIZE - 1); | |
5148 | unsigned long dst_i; | |
5149 | unsigned long src_i; | |
5150 | ||
5151 | if (src_offset + len > dst->len) { | |
d397712b CM |
5152 | printk(KERN_ERR "btrfs memmove bogus src_offset %lu move " |
5153 | "len %lu dst len %lu\n", src_offset, len, dst->len); | |
d1310b2e CM |
5154 | BUG_ON(1); |
5155 | } | |
5156 | if (dst_offset + len > dst->len) { | |
d397712b CM |
5157 | printk(KERN_ERR "btrfs memmove bogus dst_offset %lu move " |
5158 | "len %lu dst len %lu\n", dst_offset, len, dst->len); | |
d1310b2e CM |
5159 | BUG_ON(1); |
5160 | } | |
5161 | ||
d397712b | 5162 | while (len > 0) { |
d1310b2e | 5163 | dst_off_in_page = (start_offset + dst_offset) & |
778746b5 | 5164 | (PAGE_CACHE_SIZE - 1); |
d1310b2e | 5165 | src_off_in_page = (start_offset + src_offset) & |
778746b5 | 5166 | (PAGE_CACHE_SIZE - 1); |
d1310b2e CM |
5167 | |
5168 | dst_i = (start_offset + dst_offset) >> PAGE_CACHE_SHIFT; | |
5169 | src_i = (start_offset + src_offset) >> PAGE_CACHE_SHIFT; | |
5170 | ||
5171 | cur = min(len, (unsigned long)(PAGE_CACHE_SIZE - | |
5172 | src_off_in_page)); | |
5173 | cur = min_t(unsigned long, cur, | |
5174 | (unsigned long)(PAGE_CACHE_SIZE - dst_off_in_page)); | |
5175 | ||
5176 | copy_pages(extent_buffer_page(dst, dst_i), | |
5177 | extent_buffer_page(dst, src_i), | |
5178 | dst_off_in_page, src_off_in_page, cur); | |
5179 | ||
5180 | src_offset += cur; | |
5181 | dst_offset += cur; | |
5182 | len -= cur; | |
5183 | } | |
5184 | } | |
d1310b2e CM |
5185 | |
5186 | void memmove_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset, | |
5187 | unsigned long src_offset, unsigned long len) | |
5188 | { | |
5189 | size_t cur; | |
5190 | size_t dst_off_in_page; | |
5191 | size_t src_off_in_page; | |
5192 | unsigned long dst_end = dst_offset + len - 1; | |
5193 | unsigned long src_end = src_offset + len - 1; | |
5194 | size_t start_offset = dst->start & ((u64)PAGE_CACHE_SIZE - 1); | |
5195 | unsigned long dst_i; | |
5196 | unsigned long src_i; | |
5197 | ||
5198 | if (src_offset + len > dst->len) { | |
d397712b CM |
5199 | printk(KERN_ERR "btrfs memmove bogus src_offset %lu move " |
5200 | "len %lu len %lu\n", src_offset, len, dst->len); | |
d1310b2e CM |
5201 | BUG_ON(1); |
5202 | } | |
5203 | if (dst_offset + len > dst->len) { | |
d397712b CM |
5204 | printk(KERN_ERR "btrfs memmove bogus dst_offset %lu move " |
5205 | "len %lu len %lu\n", dst_offset, len, dst->len); | |
d1310b2e CM |
5206 | BUG_ON(1); |
5207 | } | |
727011e0 | 5208 | if (dst_offset < src_offset) { |
d1310b2e CM |
5209 | memcpy_extent_buffer(dst, dst_offset, src_offset, len); |
5210 | return; | |
5211 | } | |
d397712b | 5212 | while (len > 0) { |
d1310b2e CM |
5213 | dst_i = (start_offset + dst_end) >> PAGE_CACHE_SHIFT; |
5214 | src_i = (start_offset + src_end) >> PAGE_CACHE_SHIFT; | |
5215 | ||
5216 | dst_off_in_page = (start_offset + dst_end) & | |
778746b5 | 5217 | (PAGE_CACHE_SIZE - 1); |
d1310b2e | 5218 | src_off_in_page = (start_offset + src_end) & |
778746b5 | 5219 | (PAGE_CACHE_SIZE - 1); |
d1310b2e CM |
5220 | |
5221 | cur = min_t(unsigned long, len, src_off_in_page + 1); | |
5222 | cur = min(cur, dst_off_in_page + 1); | |
5223 | move_pages(extent_buffer_page(dst, dst_i), | |
5224 | extent_buffer_page(dst, src_i), | |
5225 | dst_off_in_page - cur + 1, | |
5226 | src_off_in_page - cur + 1, cur); | |
5227 | ||
5228 | dst_end -= cur; | |
5229 | src_end -= cur; | |
5230 | len -= cur; | |
5231 | } | |
5232 | } | |
6af118ce | 5233 | |
f7a52a40 | 5234 | int try_release_extent_buffer(struct page *page) |
19fe0a8b | 5235 | { |
6af118ce | 5236 | struct extent_buffer *eb; |
6af118ce | 5237 | |
3083ee2e JB |
5238 | /* |
5239 | * We need to make sure noboody is attaching this page to an eb right | |
5240 | * now. | |
5241 | */ | |
5242 | spin_lock(&page->mapping->private_lock); | |
5243 | if (!PagePrivate(page)) { | |
5244 | spin_unlock(&page->mapping->private_lock); | |
4f2de97a | 5245 | return 1; |
45f49bce | 5246 | } |
6af118ce | 5247 | |
3083ee2e JB |
5248 | eb = (struct extent_buffer *)page->private; |
5249 | BUG_ON(!eb); | |
19fe0a8b MX |
5250 | |
5251 | /* | |
3083ee2e JB |
5252 | * This is a little awful but should be ok, we need to make sure that |
5253 | * the eb doesn't disappear out from under us while we're looking at | |
5254 | * this page. | |
19fe0a8b | 5255 | */ |
3083ee2e | 5256 | spin_lock(&eb->refs_lock); |
0b32f4bb | 5257 | if (atomic_read(&eb->refs) != 1 || extent_buffer_under_io(eb)) { |
3083ee2e JB |
5258 | spin_unlock(&eb->refs_lock); |
5259 | spin_unlock(&page->mapping->private_lock); | |
5260 | return 0; | |
b9473439 | 5261 | } |
3083ee2e | 5262 | spin_unlock(&page->mapping->private_lock); |
897ca6e9 | 5263 | |
19fe0a8b | 5264 | /* |
3083ee2e JB |
5265 | * If tree ref isn't set then we know the ref on this eb is a real ref, |
5266 | * so just return, this page will likely be freed soon anyway. | |
19fe0a8b | 5267 | */ |
3083ee2e JB |
5268 | if (!test_and_clear_bit(EXTENT_BUFFER_TREE_REF, &eb->bflags)) { |
5269 | spin_unlock(&eb->refs_lock); | |
5270 | return 0; | |
b9473439 | 5271 | } |
19fe0a8b | 5272 | |
f7a52a40 | 5273 | return release_extent_buffer(eb); |
6af118ce | 5274 | } |