Commit | Line | Data |
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d1310b2e CM |
1 | #include <linux/bitops.h> |
2 | #include <linux/slab.h> | |
3 | #include <linux/bio.h> | |
4 | #include <linux/mm.h> | |
d1310b2e CM |
5 | #include <linux/pagemap.h> |
6 | #include <linux/page-flags.h> | |
d1310b2e CM |
7 | #include <linux/spinlock.h> |
8 | #include <linux/blkdev.h> | |
9 | #include <linux/swap.h> | |
d1310b2e CM |
10 | #include <linux/writeback.h> |
11 | #include <linux/pagevec.h> | |
268bb0ce | 12 | #include <linux/prefetch.h> |
90a887c9 | 13 | #include <linux/cleancache.h> |
d1310b2e CM |
14 | #include "extent_io.h" |
15 | #include "extent_map.h" | |
902b22f3 DW |
16 | #include "ctree.h" |
17 | #include "btrfs_inode.h" | |
4a54c8c1 | 18 | #include "volumes.h" |
21adbd5c | 19 | #include "check-integrity.h" |
0b32f4bb | 20 | #include "locking.h" |
606686ee | 21 | #include "rcu-string.h" |
fe09e16c | 22 | #include "backref.h" |
d1310b2e | 23 | |
d1310b2e CM |
24 | static struct kmem_cache *extent_state_cache; |
25 | static struct kmem_cache *extent_buffer_cache; | |
9be3395b | 26 | static struct bio_set *btrfs_bioset; |
d1310b2e | 27 | |
27a3507d FM |
28 | static inline bool extent_state_in_tree(const struct extent_state *state) |
29 | { | |
30 | return !RB_EMPTY_NODE(&state->rb_node); | |
31 | } | |
32 | ||
6d49ba1b | 33 | #ifdef CONFIG_BTRFS_DEBUG |
d1310b2e CM |
34 | static LIST_HEAD(buffers); |
35 | static LIST_HEAD(states); | |
4bef0848 | 36 | |
d397712b | 37 | static DEFINE_SPINLOCK(leak_lock); |
6d49ba1b ES |
38 | |
39 | static inline | |
40 | void btrfs_leak_debug_add(struct list_head *new, struct list_head *head) | |
41 | { | |
42 | unsigned long flags; | |
43 | ||
44 | spin_lock_irqsave(&leak_lock, flags); | |
45 | list_add(new, head); | |
46 | spin_unlock_irqrestore(&leak_lock, flags); | |
47 | } | |
48 | ||
49 | static inline | |
50 | void btrfs_leak_debug_del(struct list_head *entry) | |
51 | { | |
52 | unsigned long flags; | |
53 | ||
54 | spin_lock_irqsave(&leak_lock, flags); | |
55 | list_del(entry); | |
56 | spin_unlock_irqrestore(&leak_lock, flags); | |
57 | } | |
58 | ||
59 | static inline | |
60 | void btrfs_leak_debug_check(void) | |
61 | { | |
62 | struct extent_state *state; | |
63 | struct extent_buffer *eb; | |
64 | ||
65 | while (!list_empty(&states)) { | |
66 | state = list_entry(states.next, struct extent_state, leak_list); | |
9ee49a04 | 67 | pr_err("BTRFS: state leak: start %llu end %llu state %u in tree %d refs %d\n", |
27a3507d FM |
68 | state->start, state->end, state->state, |
69 | extent_state_in_tree(state), | |
c1c9ff7c | 70 | atomic_read(&state->refs)); |
6d49ba1b ES |
71 | list_del(&state->leak_list); |
72 | kmem_cache_free(extent_state_cache, state); | |
73 | } | |
74 | ||
75 | while (!list_empty(&buffers)) { | |
76 | eb = list_entry(buffers.next, struct extent_buffer, leak_list); | |
efe120a0 | 77 | printk(KERN_ERR "BTRFS: buffer leak start %llu len %lu " |
c1c9ff7c GU |
78 | "refs %d\n", |
79 | eb->start, eb->len, atomic_read(&eb->refs)); | |
6d49ba1b ES |
80 | list_del(&eb->leak_list); |
81 | kmem_cache_free(extent_buffer_cache, eb); | |
82 | } | |
83 | } | |
8d599ae1 | 84 | |
a5dee37d JB |
85 | #define btrfs_debug_check_extent_io_range(tree, start, end) \ |
86 | __btrfs_debug_check_extent_io_range(__func__, (tree), (start), (end)) | |
8d599ae1 | 87 | static inline void __btrfs_debug_check_extent_io_range(const char *caller, |
a5dee37d | 88 | struct extent_io_tree *tree, u64 start, u64 end) |
8d599ae1 | 89 | { |
a5dee37d JB |
90 | struct inode *inode; |
91 | u64 isize; | |
8d599ae1 | 92 | |
a5dee37d JB |
93 | if (!tree->mapping) |
94 | return; | |
8d599ae1 | 95 | |
a5dee37d JB |
96 | inode = tree->mapping->host; |
97 | isize = i_size_read(inode); | |
8d599ae1 DS |
98 | if (end >= PAGE_SIZE && (end % 2) == 0 && end != isize - 1) { |
99 | printk_ratelimited(KERN_DEBUG | |
efe120a0 | 100 | "BTRFS: %s: ino %llu isize %llu odd range [%llu,%llu]\n", |
c1c9ff7c | 101 | caller, btrfs_ino(inode), isize, start, end); |
8d599ae1 DS |
102 | } |
103 | } | |
6d49ba1b ES |
104 | #else |
105 | #define btrfs_leak_debug_add(new, head) do {} while (0) | |
106 | #define btrfs_leak_debug_del(entry) do {} while (0) | |
107 | #define btrfs_leak_debug_check() do {} while (0) | |
8d599ae1 | 108 | #define btrfs_debug_check_extent_io_range(c, s, e) do {} while (0) |
4bef0848 | 109 | #endif |
d1310b2e | 110 | |
d1310b2e CM |
111 | #define BUFFER_LRU_MAX 64 |
112 | ||
113 | struct tree_entry { | |
114 | u64 start; | |
115 | u64 end; | |
d1310b2e CM |
116 | struct rb_node rb_node; |
117 | }; | |
118 | ||
119 | struct extent_page_data { | |
120 | struct bio *bio; | |
121 | struct extent_io_tree *tree; | |
122 | get_extent_t *get_extent; | |
de0022b9 | 123 | unsigned long bio_flags; |
771ed689 CM |
124 | |
125 | /* tells writepage not to lock the state bits for this range | |
126 | * it still does the unlocking | |
127 | */ | |
ffbd517d CM |
128 | unsigned int extent_locked:1; |
129 | ||
130 | /* tells the submit_bio code to use a WRITE_SYNC */ | |
131 | unsigned int sync_io:1; | |
d1310b2e CM |
132 | }; |
133 | ||
0b32f4bb | 134 | static noinline void flush_write_bio(void *data); |
c2d904e0 JM |
135 | static inline struct btrfs_fs_info * |
136 | tree_fs_info(struct extent_io_tree *tree) | |
137 | { | |
a5dee37d JB |
138 | if (!tree->mapping) |
139 | return NULL; | |
c2d904e0 JM |
140 | return btrfs_sb(tree->mapping->host->i_sb); |
141 | } | |
0b32f4bb | 142 | |
d1310b2e CM |
143 | int __init extent_io_init(void) |
144 | { | |
837e1972 | 145 | extent_state_cache = kmem_cache_create("btrfs_extent_state", |
9601e3f6 CH |
146 | sizeof(struct extent_state), 0, |
147 | SLAB_RECLAIM_ACCOUNT | SLAB_MEM_SPREAD, NULL); | |
d1310b2e CM |
148 | if (!extent_state_cache) |
149 | return -ENOMEM; | |
150 | ||
837e1972 | 151 | extent_buffer_cache = kmem_cache_create("btrfs_extent_buffer", |
9601e3f6 CH |
152 | sizeof(struct extent_buffer), 0, |
153 | SLAB_RECLAIM_ACCOUNT | SLAB_MEM_SPREAD, NULL); | |
d1310b2e CM |
154 | if (!extent_buffer_cache) |
155 | goto free_state_cache; | |
9be3395b CM |
156 | |
157 | btrfs_bioset = bioset_create(BIO_POOL_SIZE, | |
158 | offsetof(struct btrfs_io_bio, bio)); | |
159 | if (!btrfs_bioset) | |
160 | goto free_buffer_cache; | |
b208c2f7 DW |
161 | |
162 | if (bioset_integrity_create(btrfs_bioset, BIO_POOL_SIZE)) | |
163 | goto free_bioset; | |
164 | ||
d1310b2e CM |
165 | return 0; |
166 | ||
b208c2f7 DW |
167 | free_bioset: |
168 | bioset_free(btrfs_bioset); | |
169 | btrfs_bioset = NULL; | |
170 | ||
9be3395b CM |
171 | free_buffer_cache: |
172 | kmem_cache_destroy(extent_buffer_cache); | |
173 | extent_buffer_cache = NULL; | |
174 | ||
d1310b2e CM |
175 | free_state_cache: |
176 | kmem_cache_destroy(extent_state_cache); | |
9be3395b | 177 | extent_state_cache = NULL; |
d1310b2e CM |
178 | return -ENOMEM; |
179 | } | |
180 | ||
181 | void extent_io_exit(void) | |
182 | { | |
6d49ba1b | 183 | btrfs_leak_debug_check(); |
8c0a8537 KS |
184 | |
185 | /* | |
186 | * Make sure all delayed rcu free are flushed before we | |
187 | * destroy caches. | |
188 | */ | |
189 | rcu_barrier(); | |
d1310b2e CM |
190 | if (extent_state_cache) |
191 | kmem_cache_destroy(extent_state_cache); | |
192 | if (extent_buffer_cache) | |
193 | kmem_cache_destroy(extent_buffer_cache); | |
9be3395b CM |
194 | if (btrfs_bioset) |
195 | bioset_free(btrfs_bioset); | |
d1310b2e CM |
196 | } |
197 | ||
198 | void extent_io_tree_init(struct extent_io_tree *tree, | |
f993c883 | 199 | struct address_space *mapping) |
d1310b2e | 200 | { |
6bef4d31 | 201 | tree->state = RB_ROOT; |
d1310b2e CM |
202 | tree->ops = NULL; |
203 | tree->dirty_bytes = 0; | |
70dec807 | 204 | spin_lock_init(&tree->lock); |
d1310b2e | 205 | tree->mapping = mapping; |
d1310b2e | 206 | } |
d1310b2e | 207 | |
b2950863 | 208 | static struct extent_state *alloc_extent_state(gfp_t mask) |
d1310b2e CM |
209 | { |
210 | struct extent_state *state; | |
d1310b2e CM |
211 | |
212 | state = kmem_cache_alloc(extent_state_cache, mask); | |
2b114d1d | 213 | if (!state) |
d1310b2e CM |
214 | return state; |
215 | state->state = 0; | |
d1310b2e | 216 | state->private = 0; |
27a3507d | 217 | RB_CLEAR_NODE(&state->rb_node); |
6d49ba1b | 218 | btrfs_leak_debug_add(&state->leak_list, &states); |
d1310b2e CM |
219 | atomic_set(&state->refs, 1); |
220 | init_waitqueue_head(&state->wq); | |
143bede5 | 221 | trace_alloc_extent_state(state, mask, _RET_IP_); |
d1310b2e CM |
222 | return state; |
223 | } | |
d1310b2e | 224 | |
4845e44f | 225 | void free_extent_state(struct extent_state *state) |
d1310b2e | 226 | { |
d1310b2e CM |
227 | if (!state) |
228 | return; | |
229 | if (atomic_dec_and_test(&state->refs)) { | |
27a3507d | 230 | WARN_ON(extent_state_in_tree(state)); |
6d49ba1b | 231 | btrfs_leak_debug_del(&state->leak_list); |
143bede5 | 232 | trace_free_extent_state(state, _RET_IP_); |
d1310b2e CM |
233 | kmem_cache_free(extent_state_cache, state); |
234 | } | |
235 | } | |
d1310b2e | 236 | |
f2071b21 FM |
237 | static struct rb_node *tree_insert(struct rb_root *root, |
238 | struct rb_node *search_start, | |
239 | u64 offset, | |
12cfbad9 FDBM |
240 | struct rb_node *node, |
241 | struct rb_node ***p_in, | |
242 | struct rb_node **parent_in) | |
d1310b2e | 243 | { |
f2071b21 | 244 | struct rb_node **p; |
d397712b | 245 | struct rb_node *parent = NULL; |
d1310b2e CM |
246 | struct tree_entry *entry; |
247 | ||
12cfbad9 FDBM |
248 | if (p_in && parent_in) { |
249 | p = *p_in; | |
250 | parent = *parent_in; | |
251 | goto do_insert; | |
252 | } | |
253 | ||
f2071b21 | 254 | p = search_start ? &search_start : &root->rb_node; |
d397712b | 255 | while (*p) { |
d1310b2e CM |
256 | parent = *p; |
257 | entry = rb_entry(parent, struct tree_entry, rb_node); | |
258 | ||
259 | if (offset < entry->start) | |
260 | p = &(*p)->rb_left; | |
261 | else if (offset > entry->end) | |
262 | p = &(*p)->rb_right; | |
263 | else | |
264 | return parent; | |
265 | } | |
266 | ||
12cfbad9 | 267 | do_insert: |
d1310b2e CM |
268 | rb_link_node(node, parent, p); |
269 | rb_insert_color(node, root); | |
270 | return NULL; | |
271 | } | |
272 | ||
80ea96b1 | 273 | static struct rb_node *__etree_search(struct extent_io_tree *tree, u64 offset, |
12cfbad9 FDBM |
274 | struct rb_node **prev_ret, |
275 | struct rb_node **next_ret, | |
276 | struct rb_node ***p_ret, | |
277 | struct rb_node **parent_ret) | |
d1310b2e | 278 | { |
80ea96b1 | 279 | struct rb_root *root = &tree->state; |
12cfbad9 | 280 | struct rb_node **n = &root->rb_node; |
d1310b2e CM |
281 | struct rb_node *prev = NULL; |
282 | struct rb_node *orig_prev = NULL; | |
283 | struct tree_entry *entry; | |
284 | struct tree_entry *prev_entry = NULL; | |
285 | ||
12cfbad9 FDBM |
286 | while (*n) { |
287 | prev = *n; | |
288 | entry = rb_entry(prev, struct tree_entry, rb_node); | |
d1310b2e CM |
289 | prev_entry = entry; |
290 | ||
291 | if (offset < entry->start) | |
12cfbad9 | 292 | n = &(*n)->rb_left; |
d1310b2e | 293 | else if (offset > entry->end) |
12cfbad9 | 294 | n = &(*n)->rb_right; |
d397712b | 295 | else |
12cfbad9 | 296 | return *n; |
d1310b2e CM |
297 | } |
298 | ||
12cfbad9 FDBM |
299 | if (p_ret) |
300 | *p_ret = n; | |
301 | if (parent_ret) | |
302 | *parent_ret = prev; | |
303 | ||
d1310b2e CM |
304 | if (prev_ret) { |
305 | orig_prev = prev; | |
d397712b | 306 | while (prev && offset > prev_entry->end) { |
d1310b2e CM |
307 | prev = rb_next(prev); |
308 | prev_entry = rb_entry(prev, struct tree_entry, rb_node); | |
309 | } | |
310 | *prev_ret = prev; | |
311 | prev = orig_prev; | |
312 | } | |
313 | ||
314 | if (next_ret) { | |
315 | prev_entry = rb_entry(prev, struct tree_entry, rb_node); | |
d397712b | 316 | while (prev && offset < prev_entry->start) { |
d1310b2e CM |
317 | prev = rb_prev(prev); |
318 | prev_entry = rb_entry(prev, struct tree_entry, rb_node); | |
319 | } | |
320 | *next_ret = prev; | |
321 | } | |
322 | return NULL; | |
323 | } | |
324 | ||
12cfbad9 FDBM |
325 | static inline struct rb_node * |
326 | tree_search_for_insert(struct extent_io_tree *tree, | |
327 | u64 offset, | |
328 | struct rb_node ***p_ret, | |
329 | struct rb_node **parent_ret) | |
d1310b2e | 330 | { |
70dec807 | 331 | struct rb_node *prev = NULL; |
d1310b2e | 332 | struct rb_node *ret; |
70dec807 | 333 | |
12cfbad9 | 334 | ret = __etree_search(tree, offset, &prev, NULL, p_ret, parent_ret); |
d397712b | 335 | if (!ret) |
d1310b2e CM |
336 | return prev; |
337 | return ret; | |
338 | } | |
339 | ||
12cfbad9 FDBM |
340 | static inline struct rb_node *tree_search(struct extent_io_tree *tree, |
341 | u64 offset) | |
342 | { | |
343 | return tree_search_for_insert(tree, offset, NULL, NULL); | |
344 | } | |
345 | ||
9ed74f2d JB |
346 | static void merge_cb(struct extent_io_tree *tree, struct extent_state *new, |
347 | struct extent_state *other) | |
348 | { | |
349 | if (tree->ops && tree->ops->merge_extent_hook) | |
350 | tree->ops->merge_extent_hook(tree->mapping->host, new, | |
351 | other); | |
352 | } | |
353 | ||
d1310b2e CM |
354 | /* |
355 | * utility function to look for merge candidates inside a given range. | |
356 | * Any extents with matching state are merged together into a single | |
357 | * extent in the tree. Extents with EXTENT_IO in their state field | |
358 | * are not merged because the end_io handlers need to be able to do | |
359 | * operations on them without sleeping (or doing allocations/splits). | |
360 | * | |
361 | * This should be called with the tree lock held. | |
362 | */ | |
1bf85046 JM |
363 | static void merge_state(struct extent_io_tree *tree, |
364 | struct extent_state *state) | |
d1310b2e CM |
365 | { |
366 | struct extent_state *other; | |
367 | struct rb_node *other_node; | |
368 | ||
5b21f2ed | 369 | if (state->state & (EXTENT_IOBITS | EXTENT_BOUNDARY)) |
1bf85046 | 370 | return; |
d1310b2e CM |
371 | |
372 | other_node = rb_prev(&state->rb_node); | |
373 | if (other_node) { | |
374 | other = rb_entry(other_node, struct extent_state, rb_node); | |
375 | if (other->end == state->start - 1 && | |
376 | other->state == state->state) { | |
9ed74f2d | 377 | merge_cb(tree, state, other); |
d1310b2e | 378 | state->start = other->start; |
d1310b2e | 379 | rb_erase(&other->rb_node, &tree->state); |
27a3507d | 380 | RB_CLEAR_NODE(&other->rb_node); |
d1310b2e CM |
381 | free_extent_state(other); |
382 | } | |
383 | } | |
384 | other_node = rb_next(&state->rb_node); | |
385 | if (other_node) { | |
386 | other = rb_entry(other_node, struct extent_state, rb_node); | |
387 | if (other->start == state->end + 1 && | |
388 | other->state == state->state) { | |
9ed74f2d | 389 | merge_cb(tree, state, other); |
df98b6e2 | 390 | state->end = other->end; |
df98b6e2 | 391 | rb_erase(&other->rb_node, &tree->state); |
27a3507d | 392 | RB_CLEAR_NODE(&other->rb_node); |
df98b6e2 | 393 | free_extent_state(other); |
d1310b2e CM |
394 | } |
395 | } | |
d1310b2e CM |
396 | } |
397 | ||
1bf85046 | 398 | static void set_state_cb(struct extent_io_tree *tree, |
9ee49a04 | 399 | struct extent_state *state, unsigned *bits) |
291d673e | 400 | { |
1bf85046 JM |
401 | if (tree->ops && tree->ops->set_bit_hook) |
402 | tree->ops->set_bit_hook(tree->mapping->host, state, bits); | |
291d673e CM |
403 | } |
404 | ||
405 | static void clear_state_cb(struct extent_io_tree *tree, | |
9ee49a04 | 406 | struct extent_state *state, unsigned *bits) |
291d673e | 407 | { |
9ed74f2d JB |
408 | if (tree->ops && tree->ops->clear_bit_hook) |
409 | tree->ops->clear_bit_hook(tree->mapping->host, state, bits); | |
291d673e CM |
410 | } |
411 | ||
3150b699 | 412 | static void set_state_bits(struct extent_io_tree *tree, |
9ee49a04 | 413 | struct extent_state *state, unsigned *bits); |
3150b699 | 414 | |
d1310b2e CM |
415 | /* |
416 | * insert an extent_state struct into the tree. 'bits' are set on the | |
417 | * struct before it is inserted. | |
418 | * | |
419 | * This may return -EEXIST if the extent is already there, in which case the | |
420 | * state struct is freed. | |
421 | * | |
422 | * The tree lock is not taken internally. This is a utility function and | |
423 | * probably isn't what you want to call (see set/clear_extent_bit). | |
424 | */ | |
425 | static int insert_state(struct extent_io_tree *tree, | |
426 | struct extent_state *state, u64 start, u64 end, | |
12cfbad9 FDBM |
427 | struct rb_node ***p, |
428 | struct rb_node **parent, | |
9ee49a04 | 429 | unsigned *bits) |
d1310b2e CM |
430 | { |
431 | struct rb_node *node; | |
432 | ||
31b1a2bd | 433 | if (end < start) |
efe120a0 | 434 | WARN(1, KERN_ERR "BTRFS: end < start %llu %llu\n", |
c1c9ff7c | 435 | end, start); |
d1310b2e CM |
436 | state->start = start; |
437 | state->end = end; | |
9ed74f2d | 438 | |
3150b699 XG |
439 | set_state_bits(tree, state, bits); |
440 | ||
f2071b21 | 441 | node = tree_insert(&tree->state, NULL, end, &state->rb_node, p, parent); |
d1310b2e CM |
442 | if (node) { |
443 | struct extent_state *found; | |
444 | found = rb_entry(node, struct extent_state, rb_node); | |
efe120a0 | 445 | printk(KERN_ERR "BTRFS: found node %llu %llu on insert of " |
c1c9ff7c GU |
446 | "%llu %llu\n", |
447 | found->start, found->end, start, end); | |
d1310b2e CM |
448 | return -EEXIST; |
449 | } | |
450 | merge_state(tree, state); | |
451 | return 0; | |
452 | } | |
453 | ||
1bf85046 | 454 | static void split_cb(struct extent_io_tree *tree, struct extent_state *orig, |
9ed74f2d JB |
455 | u64 split) |
456 | { | |
457 | if (tree->ops && tree->ops->split_extent_hook) | |
1bf85046 | 458 | tree->ops->split_extent_hook(tree->mapping->host, orig, split); |
9ed74f2d JB |
459 | } |
460 | ||
d1310b2e CM |
461 | /* |
462 | * split a given extent state struct in two, inserting the preallocated | |
463 | * struct 'prealloc' as the newly created second half. 'split' indicates an | |
464 | * offset inside 'orig' where it should be split. | |
465 | * | |
466 | * Before calling, | |
467 | * the tree has 'orig' at [orig->start, orig->end]. After calling, there | |
468 | * are two extent state structs in the tree: | |
469 | * prealloc: [orig->start, split - 1] | |
470 | * orig: [ split, orig->end ] | |
471 | * | |
472 | * The tree locks are not taken by this function. They need to be held | |
473 | * by the caller. | |
474 | */ | |
475 | static int split_state(struct extent_io_tree *tree, struct extent_state *orig, | |
476 | struct extent_state *prealloc, u64 split) | |
477 | { | |
478 | struct rb_node *node; | |
9ed74f2d JB |
479 | |
480 | split_cb(tree, orig, split); | |
481 | ||
d1310b2e CM |
482 | prealloc->start = orig->start; |
483 | prealloc->end = split - 1; | |
484 | prealloc->state = orig->state; | |
485 | orig->start = split; | |
486 | ||
f2071b21 FM |
487 | node = tree_insert(&tree->state, &orig->rb_node, prealloc->end, |
488 | &prealloc->rb_node, NULL, NULL); | |
d1310b2e | 489 | if (node) { |
d1310b2e CM |
490 | free_extent_state(prealloc); |
491 | return -EEXIST; | |
492 | } | |
493 | return 0; | |
494 | } | |
495 | ||
cdc6a395 LZ |
496 | static struct extent_state *next_state(struct extent_state *state) |
497 | { | |
498 | struct rb_node *next = rb_next(&state->rb_node); | |
499 | if (next) | |
500 | return rb_entry(next, struct extent_state, rb_node); | |
501 | else | |
502 | return NULL; | |
503 | } | |
504 | ||
d1310b2e CM |
505 | /* |
506 | * utility function to clear some bits in an extent state struct. | |
1b303fc0 | 507 | * it will optionally wake up any one waiting on this state (wake == 1). |
d1310b2e CM |
508 | * |
509 | * If no bits are set on the state struct after clearing things, the | |
510 | * struct is freed and removed from the tree | |
511 | */ | |
cdc6a395 LZ |
512 | static struct extent_state *clear_state_bit(struct extent_io_tree *tree, |
513 | struct extent_state *state, | |
9ee49a04 | 514 | unsigned *bits, int wake) |
d1310b2e | 515 | { |
cdc6a395 | 516 | struct extent_state *next; |
9ee49a04 | 517 | unsigned bits_to_clear = *bits & ~EXTENT_CTLBITS; |
d1310b2e | 518 | |
0ca1f7ce | 519 | if ((bits_to_clear & EXTENT_DIRTY) && (state->state & EXTENT_DIRTY)) { |
d1310b2e CM |
520 | u64 range = state->end - state->start + 1; |
521 | WARN_ON(range > tree->dirty_bytes); | |
522 | tree->dirty_bytes -= range; | |
523 | } | |
291d673e | 524 | clear_state_cb(tree, state, bits); |
32c00aff | 525 | state->state &= ~bits_to_clear; |
d1310b2e CM |
526 | if (wake) |
527 | wake_up(&state->wq); | |
0ca1f7ce | 528 | if (state->state == 0) { |
cdc6a395 | 529 | next = next_state(state); |
27a3507d | 530 | if (extent_state_in_tree(state)) { |
d1310b2e | 531 | rb_erase(&state->rb_node, &tree->state); |
27a3507d | 532 | RB_CLEAR_NODE(&state->rb_node); |
d1310b2e CM |
533 | free_extent_state(state); |
534 | } else { | |
535 | WARN_ON(1); | |
536 | } | |
537 | } else { | |
538 | merge_state(tree, state); | |
cdc6a395 | 539 | next = next_state(state); |
d1310b2e | 540 | } |
cdc6a395 | 541 | return next; |
d1310b2e CM |
542 | } |
543 | ||
8233767a XG |
544 | static struct extent_state * |
545 | alloc_extent_state_atomic(struct extent_state *prealloc) | |
546 | { | |
547 | if (!prealloc) | |
548 | prealloc = alloc_extent_state(GFP_ATOMIC); | |
549 | ||
550 | return prealloc; | |
551 | } | |
552 | ||
48a3b636 | 553 | static void extent_io_tree_panic(struct extent_io_tree *tree, int err) |
c2d904e0 JM |
554 | { |
555 | btrfs_panic(tree_fs_info(tree), err, "Locking error: " | |
556 | "Extent tree was modified by another " | |
557 | "thread while locked."); | |
558 | } | |
559 | ||
d1310b2e CM |
560 | /* |
561 | * clear some bits on a range in the tree. This may require splitting | |
562 | * or inserting elements in the tree, so the gfp mask is used to | |
563 | * indicate which allocations or sleeping are allowed. | |
564 | * | |
565 | * pass 'wake' == 1 to kick any sleepers, and 'delete' == 1 to remove | |
566 | * the given range from the tree regardless of state (ie for truncate). | |
567 | * | |
568 | * the range [start, end] is inclusive. | |
569 | * | |
6763af84 | 570 | * This takes the tree lock, and returns 0 on success and < 0 on error. |
d1310b2e CM |
571 | */ |
572 | int clear_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, | |
9ee49a04 | 573 | unsigned bits, int wake, int delete, |
2c64c53d CM |
574 | struct extent_state **cached_state, |
575 | gfp_t mask) | |
d1310b2e CM |
576 | { |
577 | struct extent_state *state; | |
2c64c53d | 578 | struct extent_state *cached; |
d1310b2e CM |
579 | struct extent_state *prealloc = NULL; |
580 | struct rb_node *node; | |
5c939df5 | 581 | u64 last_end; |
d1310b2e | 582 | int err; |
2ac55d41 | 583 | int clear = 0; |
d1310b2e | 584 | |
a5dee37d | 585 | btrfs_debug_check_extent_io_range(tree, start, end); |
8d599ae1 | 586 | |
7ee9e440 JB |
587 | if (bits & EXTENT_DELALLOC) |
588 | bits |= EXTENT_NORESERVE; | |
589 | ||
0ca1f7ce YZ |
590 | if (delete) |
591 | bits |= ~EXTENT_CTLBITS; | |
592 | bits |= EXTENT_FIRST_DELALLOC; | |
593 | ||
2ac55d41 JB |
594 | if (bits & (EXTENT_IOBITS | EXTENT_BOUNDARY)) |
595 | clear = 1; | |
d1310b2e CM |
596 | again: |
597 | if (!prealloc && (mask & __GFP_WAIT)) { | |
c7bc6319 FM |
598 | /* |
599 | * Don't care for allocation failure here because we might end | |
600 | * up not needing the pre-allocated extent state at all, which | |
601 | * is the case if we only have in the tree extent states that | |
602 | * cover our input range and don't cover too any other range. | |
603 | * If we end up needing a new extent state we allocate it later. | |
604 | */ | |
d1310b2e | 605 | prealloc = alloc_extent_state(mask); |
d1310b2e CM |
606 | } |
607 | ||
cad321ad | 608 | spin_lock(&tree->lock); |
2c64c53d CM |
609 | if (cached_state) { |
610 | cached = *cached_state; | |
2ac55d41 JB |
611 | |
612 | if (clear) { | |
613 | *cached_state = NULL; | |
614 | cached_state = NULL; | |
615 | } | |
616 | ||
27a3507d FM |
617 | if (cached && extent_state_in_tree(cached) && |
618 | cached->start <= start && cached->end > start) { | |
2ac55d41 JB |
619 | if (clear) |
620 | atomic_dec(&cached->refs); | |
2c64c53d | 621 | state = cached; |
42daec29 | 622 | goto hit_next; |
2c64c53d | 623 | } |
2ac55d41 JB |
624 | if (clear) |
625 | free_extent_state(cached); | |
2c64c53d | 626 | } |
d1310b2e CM |
627 | /* |
628 | * this search will find the extents that end after | |
629 | * our range starts | |
630 | */ | |
80ea96b1 | 631 | node = tree_search(tree, start); |
d1310b2e CM |
632 | if (!node) |
633 | goto out; | |
634 | state = rb_entry(node, struct extent_state, rb_node); | |
2c64c53d | 635 | hit_next: |
d1310b2e CM |
636 | if (state->start > end) |
637 | goto out; | |
638 | WARN_ON(state->end < start); | |
5c939df5 | 639 | last_end = state->end; |
d1310b2e | 640 | |
0449314a | 641 | /* the state doesn't have the wanted bits, go ahead */ |
cdc6a395 LZ |
642 | if (!(state->state & bits)) { |
643 | state = next_state(state); | |
0449314a | 644 | goto next; |
cdc6a395 | 645 | } |
0449314a | 646 | |
d1310b2e CM |
647 | /* |
648 | * | ---- desired range ---- | | |
649 | * | state | or | |
650 | * | ------------- state -------------- | | |
651 | * | |
652 | * We need to split the extent we found, and may flip | |
653 | * bits on second half. | |
654 | * | |
655 | * If the extent we found extends past our range, we | |
656 | * just split and search again. It'll get split again | |
657 | * the next time though. | |
658 | * | |
659 | * If the extent we found is inside our range, we clear | |
660 | * the desired bit on it. | |
661 | */ | |
662 | ||
663 | if (state->start < start) { | |
8233767a XG |
664 | prealloc = alloc_extent_state_atomic(prealloc); |
665 | BUG_ON(!prealloc); | |
d1310b2e | 666 | err = split_state(tree, state, prealloc, start); |
c2d904e0 JM |
667 | if (err) |
668 | extent_io_tree_panic(tree, err); | |
669 | ||
d1310b2e CM |
670 | prealloc = NULL; |
671 | if (err) | |
672 | goto out; | |
673 | if (state->end <= end) { | |
d1ac6e41 LB |
674 | state = clear_state_bit(tree, state, &bits, wake); |
675 | goto next; | |
d1310b2e CM |
676 | } |
677 | goto search_again; | |
678 | } | |
679 | /* | |
680 | * | ---- desired range ---- | | |
681 | * | state | | |
682 | * We need to split the extent, and clear the bit | |
683 | * on the first half | |
684 | */ | |
685 | if (state->start <= end && state->end > end) { | |
8233767a XG |
686 | prealloc = alloc_extent_state_atomic(prealloc); |
687 | BUG_ON(!prealloc); | |
d1310b2e | 688 | err = split_state(tree, state, prealloc, end + 1); |
c2d904e0 JM |
689 | if (err) |
690 | extent_io_tree_panic(tree, err); | |
691 | ||
d1310b2e CM |
692 | if (wake) |
693 | wake_up(&state->wq); | |
42daec29 | 694 | |
6763af84 | 695 | clear_state_bit(tree, prealloc, &bits, wake); |
9ed74f2d | 696 | |
d1310b2e CM |
697 | prealloc = NULL; |
698 | goto out; | |
699 | } | |
42daec29 | 700 | |
cdc6a395 | 701 | state = clear_state_bit(tree, state, &bits, wake); |
0449314a | 702 | next: |
5c939df5 YZ |
703 | if (last_end == (u64)-1) |
704 | goto out; | |
705 | start = last_end + 1; | |
cdc6a395 | 706 | if (start <= end && state && !need_resched()) |
692e5759 | 707 | goto hit_next; |
d1310b2e CM |
708 | goto search_again; |
709 | ||
710 | out: | |
cad321ad | 711 | spin_unlock(&tree->lock); |
d1310b2e CM |
712 | if (prealloc) |
713 | free_extent_state(prealloc); | |
714 | ||
6763af84 | 715 | return 0; |
d1310b2e CM |
716 | |
717 | search_again: | |
718 | if (start > end) | |
719 | goto out; | |
cad321ad | 720 | spin_unlock(&tree->lock); |
d1310b2e CM |
721 | if (mask & __GFP_WAIT) |
722 | cond_resched(); | |
723 | goto again; | |
724 | } | |
d1310b2e | 725 | |
143bede5 JM |
726 | static void wait_on_state(struct extent_io_tree *tree, |
727 | struct extent_state *state) | |
641f5219 CH |
728 | __releases(tree->lock) |
729 | __acquires(tree->lock) | |
d1310b2e CM |
730 | { |
731 | DEFINE_WAIT(wait); | |
732 | prepare_to_wait(&state->wq, &wait, TASK_UNINTERRUPTIBLE); | |
cad321ad | 733 | spin_unlock(&tree->lock); |
d1310b2e | 734 | schedule(); |
cad321ad | 735 | spin_lock(&tree->lock); |
d1310b2e | 736 | finish_wait(&state->wq, &wait); |
d1310b2e CM |
737 | } |
738 | ||
739 | /* | |
740 | * waits for one or more bits to clear on a range in the state tree. | |
741 | * The range [start, end] is inclusive. | |
742 | * The tree lock is taken by this function | |
743 | */ | |
41074888 DS |
744 | static void wait_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, |
745 | unsigned long bits) | |
d1310b2e CM |
746 | { |
747 | struct extent_state *state; | |
748 | struct rb_node *node; | |
749 | ||
a5dee37d | 750 | btrfs_debug_check_extent_io_range(tree, start, end); |
8d599ae1 | 751 | |
cad321ad | 752 | spin_lock(&tree->lock); |
d1310b2e CM |
753 | again: |
754 | while (1) { | |
755 | /* | |
756 | * this search will find all the extents that end after | |
757 | * our range starts | |
758 | */ | |
80ea96b1 | 759 | node = tree_search(tree, start); |
c50d3e71 | 760 | process_node: |
d1310b2e CM |
761 | if (!node) |
762 | break; | |
763 | ||
764 | state = rb_entry(node, struct extent_state, rb_node); | |
765 | ||
766 | if (state->start > end) | |
767 | goto out; | |
768 | ||
769 | if (state->state & bits) { | |
770 | start = state->start; | |
771 | atomic_inc(&state->refs); | |
772 | wait_on_state(tree, state); | |
773 | free_extent_state(state); | |
774 | goto again; | |
775 | } | |
776 | start = state->end + 1; | |
777 | ||
778 | if (start > end) | |
779 | break; | |
780 | ||
c50d3e71 FM |
781 | if (!cond_resched_lock(&tree->lock)) { |
782 | node = rb_next(node); | |
783 | goto process_node; | |
784 | } | |
d1310b2e CM |
785 | } |
786 | out: | |
cad321ad | 787 | spin_unlock(&tree->lock); |
d1310b2e | 788 | } |
d1310b2e | 789 | |
1bf85046 | 790 | static void set_state_bits(struct extent_io_tree *tree, |
d1310b2e | 791 | struct extent_state *state, |
9ee49a04 | 792 | unsigned *bits) |
d1310b2e | 793 | { |
9ee49a04 | 794 | unsigned bits_to_set = *bits & ~EXTENT_CTLBITS; |
9ed74f2d | 795 | |
1bf85046 | 796 | set_state_cb(tree, state, bits); |
0ca1f7ce | 797 | if ((bits_to_set & EXTENT_DIRTY) && !(state->state & EXTENT_DIRTY)) { |
d1310b2e CM |
798 | u64 range = state->end - state->start + 1; |
799 | tree->dirty_bytes += range; | |
800 | } | |
0ca1f7ce | 801 | state->state |= bits_to_set; |
d1310b2e CM |
802 | } |
803 | ||
e38e2ed7 FM |
804 | static void cache_state_if_flags(struct extent_state *state, |
805 | struct extent_state **cached_ptr, | |
9ee49a04 | 806 | unsigned flags) |
2c64c53d CM |
807 | { |
808 | if (cached_ptr && !(*cached_ptr)) { | |
e38e2ed7 | 809 | if (!flags || (state->state & flags)) { |
2c64c53d CM |
810 | *cached_ptr = state; |
811 | atomic_inc(&state->refs); | |
812 | } | |
813 | } | |
814 | } | |
815 | ||
e38e2ed7 FM |
816 | static void cache_state(struct extent_state *state, |
817 | struct extent_state **cached_ptr) | |
818 | { | |
819 | return cache_state_if_flags(state, cached_ptr, | |
820 | EXTENT_IOBITS | EXTENT_BOUNDARY); | |
821 | } | |
822 | ||
d1310b2e | 823 | /* |
1edbb734 CM |
824 | * set some bits on a range in the tree. This may require allocations or |
825 | * sleeping, so the gfp mask is used to indicate what is allowed. | |
d1310b2e | 826 | * |
1edbb734 CM |
827 | * If any of the exclusive bits are set, this will fail with -EEXIST if some |
828 | * part of the range already has the desired bits set. The start of the | |
829 | * existing range is returned in failed_start in this case. | |
d1310b2e | 830 | * |
1edbb734 | 831 | * [start, end] is inclusive This takes the tree lock. |
d1310b2e | 832 | */ |
1edbb734 | 833 | |
3fbe5c02 JM |
834 | static int __must_check |
835 | __set_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, | |
9ee49a04 | 836 | unsigned bits, unsigned exclusive_bits, |
41074888 DS |
837 | u64 *failed_start, struct extent_state **cached_state, |
838 | gfp_t mask) | |
d1310b2e CM |
839 | { |
840 | struct extent_state *state; | |
841 | struct extent_state *prealloc = NULL; | |
842 | struct rb_node *node; | |
12cfbad9 FDBM |
843 | struct rb_node **p; |
844 | struct rb_node *parent; | |
d1310b2e | 845 | int err = 0; |
d1310b2e CM |
846 | u64 last_start; |
847 | u64 last_end; | |
42daec29 | 848 | |
a5dee37d | 849 | btrfs_debug_check_extent_io_range(tree, start, end); |
8d599ae1 | 850 | |
0ca1f7ce | 851 | bits |= EXTENT_FIRST_DELALLOC; |
d1310b2e CM |
852 | again: |
853 | if (!prealloc && (mask & __GFP_WAIT)) { | |
854 | prealloc = alloc_extent_state(mask); | |
8233767a | 855 | BUG_ON(!prealloc); |
d1310b2e CM |
856 | } |
857 | ||
cad321ad | 858 | spin_lock(&tree->lock); |
9655d298 CM |
859 | if (cached_state && *cached_state) { |
860 | state = *cached_state; | |
df98b6e2 | 861 | if (state->start <= start && state->end > start && |
27a3507d | 862 | extent_state_in_tree(state)) { |
9655d298 CM |
863 | node = &state->rb_node; |
864 | goto hit_next; | |
865 | } | |
866 | } | |
d1310b2e CM |
867 | /* |
868 | * this search will find all the extents that end after | |
869 | * our range starts. | |
870 | */ | |
12cfbad9 | 871 | node = tree_search_for_insert(tree, start, &p, &parent); |
d1310b2e | 872 | if (!node) { |
8233767a XG |
873 | prealloc = alloc_extent_state_atomic(prealloc); |
874 | BUG_ON(!prealloc); | |
12cfbad9 FDBM |
875 | err = insert_state(tree, prealloc, start, end, |
876 | &p, &parent, &bits); | |
c2d904e0 JM |
877 | if (err) |
878 | extent_io_tree_panic(tree, err); | |
879 | ||
c42ac0bc | 880 | cache_state(prealloc, cached_state); |
d1310b2e | 881 | prealloc = NULL; |
d1310b2e CM |
882 | goto out; |
883 | } | |
d1310b2e | 884 | state = rb_entry(node, struct extent_state, rb_node); |
40431d6c | 885 | hit_next: |
d1310b2e CM |
886 | last_start = state->start; |
887 | last_end = state->end; | |
888 | ||
889 | /* | |
890 | * | ---- desired range ---- | | |
891 | * | state | | |
892 | * | |
893 | * Just lock what we found and keep going | |
894 | */ | |
895 | if (state->start == start && state->end <= end) { | |
1edbb734 | 896 | if (state->state & exclusive_bits) { |
d1310b2e CM |
897 | *failed_start = state->start; |
898 | err = -EEXIST; | |
899 | goto out; | |
900 | } | |
42daec29 | 901 | |
1bf85046 | 902 | set_state_bits(tree, state, &bits); |
2c64c53d | 903 | cache_state(state, cached_state); |
d1310b2e | 904 | merge_state(tree, state); |
5c939df5 YZ |
905 | if (last_end == (u64)-1) |
906 | goto out; | |
907 | start = last_end + 1; | |
d1ac6e41 LB |
908 | state = next_state(state); |
909 | if (start < end && state && state->start == start && | |
910 | !need_resched()) | |
911 | goto hit_next; | |
d1310b2e CM |
912 | goto search_again; |
913 | } | |
914 | ||
915 | /* | |
916 | * | ---- desired range ---- | | |
917 | * | state | | |
918 | * or | |
919 | * | ------------- state -------------- | | |
920 | * | |
921 | * We need to split the extent we found, and may flip bits on | |
922 | * second half. | |
923 | * | |
924 | * If the extent we found extends past our | |
925 | * range, we just split and search again. It'll get split | |
926 | * again the next time though. | |
927 | * | |
928 | * If the extent we found is inside our range, we set the | |
929 | * desired bit on it. | |
930 | */ | |
931 | if (state->start < start) { | |
1edbb734 | 932 | if (state->state & exclusive_bits) { |
d1310b2e CM |
933 | *failed_start = start; |
934 | err = -EEXIST; | |
935 | goto out; | |
936 | } | |
8233767a XG |
937 | |
938 | prealloc = alloc_extent_state_atomic(prealloc); | |
939 | BUG_ON(!prealloc); | |
d1310b2e | 940 | err = split_state(tree, state, prealloc, start); |
c2d904e0 JM |
941 | if (err) |
942 | extent_io_tree_panic(tree, err); | |
943 | ||
d1310b2e CM |
944 | prealloc = NULL; |
945 | if (err) | |
946 | goto out; | |
947 | if (state->end <= end) { | |
1bf85046 | 948 | set_state_bits(tree, state, &bits); |
2c64c53d | 949 | cache_state(state, cached_state); |
d1310b2e | 950 | merge_state(tree, state); |
5c939df5 YZ |
951 | if (last_end == (u64)-1) |
952 | goto out; | |
953 | start = last_end + 1; | |
d1ac6e41 LB |
954 | state = next_state(state); |
955 | if (start < end && state && state->start == start && | |
956 | !need_resched()) | |
957 | goto hit_next; | |
d1310b2e CM |
958 | } |
959 | goto search_again; | |
960 | } | |
961 | /* | |
962 | * | ---- desired range ---- | | |
963 | * | state | or | state | | |
964 | * | |
965 | * There's a hole, we need to insert something in it and | |
966 | * ignore the extent we found. | |
967 | */ | |
968 | if (state->start > start) { | |
969 | u64 this_end; | |
970 | if (end < last_start) | |
971 | this_end = end; | |
972 | else | |
d397712b | 973 | this_end = last_start - 1; |
8233767a XG |
974 | |
975 | prealloc = alloc_extent_state_atomic(prealloc); | |
976 | BUG_ON(!prealloc); | |
c7f895a2 XG |
977 | |
978 | /* | |
979 | * Avoid to free 'prealloc' if it can be merged with | |
980 | * the later extent. | |
981 | */ | |
d1310b2e | 982 | err = insert_state(tree, prealloc, start, this_end, |
12cfbad9 | 983 | NULL, NULL, &bits); |
c2d904e0 JM |
984 | if (err) |
985 | extent_io_tree_panic(tree, err); | |
986 | ||
9ed74f2d JB |
987 | cache_state(prealloc, cached_state); |
988 | prealloc = NULL; | |
d1310b2e CM |
989 | start = this_end + 1; |
990 | goto search_again; | |
991 | } | |
992 | /* | |
993 | * | ---- desired range ---- | | |
994 | * | state | | |
995 | * We need to split the extent, and set the bit | |
996 | * on the first half | |
997 | */ | |
998 | if (state->start <= end && state->end > end) { | |
1edbb734 | 999 | if (state->state & exclusive_bits) { |
d1310b2e CM |
1000 | *failed_start = start; |
1001 | err = -EEXIST; | |
1002 | goto out; | |
1003 | } | |
8233767a XG |
1004 | |
1005 | prealloc = alloc_extent_state_atomic(prealloc); | |
1006 | BUG_ON(!prealloc); | |
d1310b2e | 1007 | err = split_state(tree, state, prealloc, end + 1); |
c2d904e0 JM |
1008 | if (err) |
1009 | extent_io_tree_panic(tree, err); | |
d1310b2e | 1010 | |
1bf85046 | 1011 | set_state_bits(tree, prealloc, &bits); |
2c64c53d | 1012 | cache_state(prealloc, cached_state); |
d1310b2e CM |
1013 | merge_state(tree, prealloc); |
1014 | prealloc = NULL; | |
1015 | goto out; | |
1016 | } | |
1017 | ||
1018 | goto search_again; | |
1019 | ||
1020 | out: | |
cad321ad | 1021 | spin_unlock(&tree->lock); |
d1310b2e CM |
1022 | if (prealloc) |
1023 | free_extent_state(prealloc); | |
1024 | ||
1025 | return err; | |
1026 | ||
1027 | search_again: | |
1028 | if (start > end) | |
1029 | goto out; | |
cad321ad | 1030 | spin_unlock(&tree->lock); |
d1310b2e CM |
1031 | if (mask & __GFP_WAIT) |
1032 | cond_resched(); | |
1033 | goto again; | |
1034 | } | |
d1310b2e | 1035 | |
41074888 | 1036 | int set_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, |
9ee49a04 | 1037 | unsigned bits, u64 * failed_start, |
41074888 | 1038 | struct extent_state **cached_state, gfp_t mask) |
3fbe5c02 JM |
1039 | { |
1040 | return __set_extent_bit(tree, start, end, bits, 0, failed_start, | |
1041 | cached_state, mask); | |
1042 | } | |
1043 | ||
1044 | ||
462d6fac | 1045 | /** |
10983f2e LB |
1046 | * convert_extent_bit - convert all bits in a given range from one bit to |
1047 | * another | |
462d6fac JB |
1048 | * @tree: the io tree to search |
1049 | * @start: the start offset in bytes | |
1050 | * @end: the end offset in bytes (inclusive) | |
1051 | * @bits: the bits to set in this range | |
1052 | * @clear_bits: the bits to clear in this range | |
e6138876 | 1053 | * @cached_state: state that we're going to cache |
462d6fac JB |
1054 | * @mask: the allocation mask |
1055 | * | |
1056 | * This will go through and set bits for the given range. If any states exist | |
1057 | * already in this range they are set with the given bit and cleared of the | |
1058 | * clear_bits. This is only meant to be used by things that are mergeable, ie | |
1059 | * converting from say DELALLOC to DIRTY. This is not meant to be used with | |
1060 | * boundary bits like LOCK. | |
1061 | */ | |
1062 | int convert_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, | |
9ee49a04 | 1063 | unsigned bits, unsigned clear_bits, |
e6138876 | 1064 | struct extent_state **cached_state, gfp_t mask) |
462d6fac JB |
1065 | { |
1066 | struct extent_state *state; | |
1067 | struct extent_state *prealloc = NULL; | |
1068 | struct rb_node *node; | |
12cfbad9 FDBM |
1069 | struct rb_node **p; |
1070 | struct rb_node *parent; | |
462d6fac JB |
1071 | int err = 0; |
1072 | u64 last_start; | |
1073 | u64 last_end; | |
c8fd3de7 | 1074 | bool first_iteration = true; |
462d6fac | 1075 | |
a5dee37d | 1076 | btrfs_debug_check_extent_io_range(tree, start, end); |
8d599ae1 | 1077 | |
462d6fac JB |
1078 | again: |
1079 | if (!prealloc && (mask & __GFP_WAIT)) { | |
c8fd3de7 FM |
1080 | /* |
1081 | * Best effort, don't worry if extent state allocation fails | |
1082 | * here for the first iteration. We might have a cached state | |
1083 | * that matches exactly the target range, in which case no | |
1084 | * extent state allocations are needed. We'll only know this | |
1085 | * after locking the tree. | |
1086 | */ | |
462d6fac | 1087 | prealloc = alloc_extent_state(mask); |
c8fd3de7 | 1088 | if (!prealloc && !first_iteration) |
462d6fac JB |
1089 | return -ENOMEM; |
1090 | } | |
1091 | ||
1092 | spin_lock(&tree->lock); | |
e6138876 JB |
1093 | if (cached_state && *cached_state) { |
1094 | state = *cached_state; | |
1095 | if (state->start <= start && state->end > start && | |
27a3507d | 1096 | extent_state_in_tree(state)) { |
e6138876 JB |
1097 | node = &state->rb_node; |
1098 | goto hit_next; | |
1099 | } | |
1100 | } | |
1101 | ||
462d6fac JB |
1102 | /* |
1103 | * this search will find all the extents that end after | |
1104 | * our range starts. | |
1105 | */ | |
12cfbad9 | 1106 | node = tree_search_for_insert(tree, start, &p, &parent); |
462d6fac JB |
1107 | if (!node) { |
1108 | prealloc = alloc_extent_state_atomic(prealloc); | |
1cf4ffdb LB |
1109 | if (!prealloc) { |
1110 | err = -ENOMEM; | |
1111 | goto out; | |
1112 | } | |
12cfbad9 FDBM |
1113 | err = insert_state(tree, prealloc, start, end, |
1114 | &p, &parent, &bits); | |
c2d904e0 JM |
1115 | if (err) |
1116 | extent_io_tree_panic(tree, err); | |
c42ac0bc FDBM |
1117 | cache_state(prealloc, cached_state); |
1118 | prealloc = NULL; | |
462d6fac JB |
1119 | goto out; |
1120 | } | |
1121 | state = rb_entry(node, struct extent_state, rb_node); | |
1122 | hit_next: | |
1123 | last_start = state->start; | |
1124 | last_end = state->end; | |
1125 | ||
1126 | /* | |
1127 | * | ---- desired range ---- | | |
1128 | * | state | | |
1129 | * | |
1130 | * Just lock what we found and keep going | |
1131 | */ | |
1132 | if (state->start == start && state->end <= end) { | |
462d6fac | 1133 | set_state_bits(tree, state, &bits); |
e6138876 | 1134 | cache_state(state, cached_state); |
d1ac6e41 | 1135 | state = clear_state_bit(tree, state, &clear_bits, 0); |
462d6fac JB |
1136 | if (last_end == (u64)-1) |
1137 | goto out; | |
462d6fac | 1138 | start = last_end + 1; |
d1ac6e41 LB |
1139 | if (start < end && state && state->start == start && |
1140 | !need_resched()) | |
1141 | goto hit_next; | |
462d6fac JB |
1142 | goto search_again; |
1143 | } | |
1144 | ||
1145 | /* | |
1146 | * | ---- desired range ---- | | |
1147 | * | state | | |
1148 | * or | |
1149 | * | ------------- state -------------- | | |
1150 | * | |
1151 | * We need to split the extent we found, and may flip bits on | |
1152 | * second half. | |
1153 | * | |
1154 | * If the extent we found extends past our | |
1155 | * range, we just split and search again. It'll get split | |
1156 | * again the next time though. | |
1157 | * | |
1158 | * If the extent we found is inside our range, we set the | |
1159 | * desired bit on it. | |
1160 | */ | |
1161 | if (state->start < start) { | |
1162 | prealloc = alloc_extent_state_atomic(prealloc); | |
1cf4ffdb LB |
1163 | if (!prealloc) { |
1164 | err = -ENOMEM; | |
1165 | goto out; | |
1166 | } | |
462d6fac | 1167 | err = split_state(tree, state, prealloc, start); |
c2d904e0 JM |
1168 | if (err) |
1169 | extent_io_tree_panic(tree, err); | |
462d6fac JB |
1170 | prealloc = NULL; |
1171 | if (err) | |
1172 | goto out; | |
1173 | if (state->end <= end) { | |
1174 | set_state_bits(tree, state, &bits); | |
e6138876 | 1175 | cache_state(state, cached_state); |
d1ac6e41 | 1176 | state = clear_state_bit(tree, state, &clear_bits, 0); |
462d6fac JB |
1177 | if (last_end == (u64)-1) |
1178 | goto out; | |
1179 | start = last_end + 1; | |
d1ac6e41 LB |
1180 | if (start < end && state && state->start == start && |
1181 | !need_resched()) | |
1182 | goto hit_next; | |
462d6fac JB |
1183 | } |
1184 | goto search_again; | |
1185 | } | |
1186 | /* | |
1187 | * | ---- desired range ---- | | |
1188 | * | state | or | state | | |
1189 | * | |
1190 | * There's a hole, we need to insert something in it and | |
1191 | * ignore the extent we found. | |
1192 | */ | |
1193 | if (state->start > start) { | |
1194 | u64 this_end; | |
1195 | if (end < last_start) | |
1196 | this_end = end; | |
1197 | else | |
1198 | this_end = last_start - 1; | |
1199 | ||
1200 | prealloc = alloc_extent_state_atomic(prealloc); | |
1cf4ffdb LB |
1201 | if (!prealloc) { |
1202 | err = -ENOMEM; | |
1203 | goto out; | |
1204 | } | |
462d6fac JB |
1205 | |
1206 | /* | |
1207 | * Avoid to free 'prealloc' if it can be merged with | |
1208 | * the later extent. | |
1209 | */ | |
1210 | err = insert_state(tree, prealloc, start, this_end, | |
12cfbad9 | 1211 | NULL, NULL, &bits); |
c2d904e0 JM |
1212 | if (err) |
1213 | extent_io_tree_panic(tree, err); | |
e6138876 | 1214 | cache_state(prealloc, cached_state); |
462d6fac JB |
1215 | prealloc = NULL; |
1216 | start = this_end + 1; | |
1217 | goto search_again; | |
1218 | } | |
1219 | /* | |
1220 | * | ---- desired range ---- | | |
1221 | * | state | | |
1222 | * We need to split the extent, and set the bit | |
1223 | * on the first half | |
1224 | */ | |
1225 | if (state->start <= end && state->end > end) { | |
1226 | prealloc = alloc_extent_state_atomic(prealloc); | |
1cf4ffdb LB |
1227 | if (!prealloc) { |
1228 | err = -ENOMEM; | |
1229 | goto out; | |
1230 | } | |
462d6fac JB |
1231 | |
1232 | err = split_state(tree, state, prealloc, end + 1); | |
c2d904e0 JM |
1233 | if (err) |
1234 | extent_io_tree_panic(tree, err); | |
462d6fac JB |
1235 | |
1236 | set_state_bits(tree, prealloc, &bits); | |
e6138876 | 1237 | cache_state(prealloc, cached_state); |
462d6fac | 1238 | clear_state_bit(tree, prealloc, &clear_bits, 0); |
462d6fac JB |
1239 | prealloc = NULL; |
1240 | goto out; | |
1241 | } | |
1242 | ||
1243 | goto search_again; | |
1244 | ||
1245 | out: | |
1246 | spin_unlock(&tree->lock); | |
1247 | if (prealloc) | |
1248 | free_extent_state(prealloc); | |
1249 | ||
1250 | return err; | |
1251 | ||
1252 | search_again: | |
1253 | if (start > end) | |
1254 | goto out; | |
1255 | spin_unlock(&tree->lock); | |
1256 | if (mask & __GFP_WAIT) | |
1257 | cond_resched(); | |
c8fd3de7 | 1258 | first_iteration = false; |
462d6fac JB |
1259 | goto again; |
1260 | } | |
1261 | ||
d1310b2e CM |
1262 | /* wrappers around set/clear extent bit */ |
1263 | int set_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end, | |
1264 | gfp_t mask) | |
1265 | { | |
3fbe5c02 | 1266 | return set_extent_bit(tree, start, end, EXTENT_DIRTY, NULL, |
2c64c53d | 1267 | NULL, mask); |
d1310b2e | 1268 | } |
d1310b2e CM |
1269 | |
1270 | int set_extent_bits(struct extent_io_tree *tree, u64 start, u64 end, | |
9ee49a04 | 1271 | unsigned bits, gfp_t mask) |
d1310b2e | 1272 | { |
3fbe5c02 | 1273 | return set_extent_bit(tree, start, end, bits, NULL, |
2c64c53d | 1274 | NULL, mask); |
d1310b2e | 1275 | } |
d1310b2e CM |
1276 | |
1277 | int clear_extent_bits(struct extent_io_tree *tree, u64 start, u64 end, | |
9ee49a04 | 1278 | unsigned bits, gfp_t mask) |
d1310b2e | 1279 | { |
2c64c53d | 1280 | return clear_extent_bit(tree, start, end, bits, 0, 0, NULL, mask); |
d1310b2e | 1281 | } |
d1310b2e CM |
1282 | |
1283 | int set_extent_delalloc(struct extent_io_tree *tree, u64 start, u64 end, | |
2ac55d41 | 1284 | struct extent_state **cached_state, gfp_t mask) |
d1310b2e CM |
1285 | { |
1286 | return set_extent_bit(tree, start, end, | |
fee187d9 | 1287 | EXTENT_DELALLOC | EXTENT_UPTODATE, |
3fbe5c02 | 1288 | NULL, cached_state, mask); |
d1310b2e | 1289 | } |
d1310b2e | 1290 | |
9e8a4a8b LB |
1291 | int set_extent_defrag(struct extent_io_tree *tree, u64 start, u64 end, |
1292 | struct extent_state **cached_state, gfp_t mask) | |
1293 | { | |
1294 | return set_extent_bit(tree, start, end, | |
1295 | EXTENT_DELALLOC | EXTENT_UPTODATE | EXTENT_DEFRAG, | |
1296 | NULL, cached_state, mask); | |
1297 | } | |
1298 | ||
d1310b2e CM |
1299 | int clear_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end, |
1300 | gfp_t mask) | |
1301 | { | |
1302 | return clear_extent_bit(tree, start, end, | |
32c00aff | 1303 | EXTENT_DIRTY | EXTENT_DELALLOC | |
0ca1f7ce | 1304 | EXTENT_DO_ACCOUNTING, 0, 0, NULL, mask); |
d1310b2e | 1305 | } |
d1310b2e CM |
1306 | |
1307 | int set_extent_new(struct extent_io_tree *tree, u64 start, u64 end, | |
1308 | gfp_t mask) | |
1309 | { | |
3fbe5c02 | 1310 | return set_extent_bit(tree, start, end, EXTENT_NEW, NULL, |
2c64c53d | 1311 | NULL, mask); |
d1310b2e | 1312 | } |
d1310b2e | 1313 | |
d1310b2e | 1314 | int set_extent_uptodate(struct extent_io_tree *tree, u64 start, u64 end, |
507903b8 | 1315 | struct extent_state **cached_state, gfp_t mask) |
d1310b2e | 1316 | { |
6b67a320 | 1317 | return set_extent_bit(tree, start, end, EXTENT_UPTODATE, NULL, |
3fbe5c02 | 1318 | cached_state, mask); |
d1310b2e | 1319 | } |
d1310b2e | 1320 | |
5fd02043 JB |
1321 | int clear_extent_uptodate(struct extent_io_tree *tree, u64 start, u64 end, |
1322 | struct extent_state **cached_state, gfp_t mask) | |
d1310b2e | 1323 | { |
2c64c53d | 1324 | return clear_extent_bit(tree, start, end, EXTENT_UPTODATE, 0, 0, |
2ac55d41 | 1325 | cached_state, mask); |
d1310b2e | 1326 | } |
d1310b2e | 1327 | |
d352ac68 CM |
1328 | /* |
1329 | * either insert or lock state struct between start and end use mask to tell | |
1330 | * us if waiting is desired. | |
1331 | */ | |
1edbb734 | 1332 | int lock_extent_bits(struct extent_io_tree *tree, u64 start, u64 end, |
9ee49a04 | 1333 | unsigned bits, struct extent_state **cached_state) |
d1310b2e CM |
1334 | { |
1335 | int err; | |
1336 | u64 failed_start; | |
9ee49a04 | 1337 | |
d1310b2e | 1338 | while (1) { |
3fbe5c02 JM |
1339 | err = __set_extent_bit(tree, start, end, EXTENT_LOCKED | bits, |
1340 | EXTENT_LOCKED, &failed_start, | |
1341 | cached_state, GFP_NOFS); | |
d0082371 | 1342 | if (err == -EEXIST) { |
d1310b2e CM |
1343 | wait_extent_bit(tree, failed_start, end, EXTENT_LOCKED); |
1344 | start = failed_start; | |
d0082371 | 1345 | } else |
d1310b2e | 1346 | break; |
d1310b2e CM |
1347 | WARN_ON(start > end); |
1348 | } | |
1349 | return err; | |
1350 | } | |
d1310b2e | 1351 | |
d0082371 | 1352 | int lock_extent(struct extent_io_tree *tree, u64 start, u64 end) |
1edbb734 | 1353 | { |
d0082371 | 1354 | return lock_extent_bits(tree, start, end, 0, NULL); |
1edbb734 CM |
1355 | } |
1356 | ||
d0082371 | 1357 | int try_lock_extent(struct extent_io_tree *tree, u64 start, u64 end) |
25179201 JB |
1358 | { |
1359 | int err; | |
1360 | u64 failed_start; | |
1361 | ||
3fbe5c02 JM |
1362 | err = __set_extent_bit(tree, start, end, EXTENT_LOCKED, EXTENT_LOCKED, |
1363 | &failed_start, NULL, GFP_NOFS); | |
6643558d YZ |
1364 | if (err == -EEXIST) { |
1365 | if (failed_start > start) | |
1366 | clear_extent_bit(tree, start, failed_start - 1, | |
d0082371 | 1367 | EXTENT_LOCKED, 1, 0, NULL, GFP_NOFS); |
25179201 | 1368 | return 0; |
6643558d | 1369 | } |
25179201 JB |
1370 | return 1; |
1371 | } | |
25179201 | 1372 | |
2c64c53d CM |
1373 | int unlock_extent_cached(struct extent_io_tree *tree, u64 start, u64 end, |
1374 | struct extent_state **cached, gfp_t mask) | |
1375 | { | |
1376 | return clear_extent_bit(tree, start, end, EXTENT_LOCKED, 1, 0, cached, | |
1377 | mask); | |
1378 | } | |
1379 | ||
d0082371 | 1380 | int unlock_extent(struct extent_io_tree *tree, u64 start, u64 end) |
d1310b2e | 1381 | { |
2c64c53d | 1382 | return clear_extent_bit(tree, start, end, EXTENT_LOCKED, 1, 0, NULL, |
d0082371 | 1383 | GFP_NOFS); |
d1310b2e | 1384 | } |
d1310b2e | 1385 | |
4adaa611 CM |
1386 | int extent_range_clear_dirty_for_io(struct inode *inode, u64 start, u64 end) |
1387 | { | |
1388 | unsigned long index = start >> PAGE_CACHE_SHIFT; | |
1389 | unsigned long end_index = end >> PAGE_CACHE_SHIFT; | |
1390 | struct page *page; | |
1391 | ||
1392 | while (index <= end_index) { | |
1393 | page = find_get_page(inode->i_mapping, index); | |
1394 | BUG_ON(!page); /* Pages should be in the extent_io_tree */ | |
1395 | clear_page_dirty_for_io(page); | |
1396 | page_cache_release(page); | |
1397 | index++; | |
1398 | } | |
1399 | return 0; | |
1400 | } | |
1401 | ||
1402 | int extent_range_redirty_for_io(struct inode *inode, u64 start, u64 end) | |
1403 | { | |
1404 | unsigned long index = start >> PAGE_CACHE_SHIFT; | |
1405 | unsigned long end_index = end >> PAGE_CACHE_SHIFT; | |
1406 | struct page *page; | |
1407 | ||
1408 | while (index <= end_index) { | |
1409 | page = find_get_page(inode->i_mapping, index); | |
1410 | BUG_ON(!page); /* Pages should be in the extent_io_tree */ | |
4adaa611 | 1411 | __set_page_dirty_nobuffers(page); |
8d38633c | 1412 | account_page_redirty(page); |
4adaa611 CM |
1413 | page_cache_release(page); |
1414 | index++; | |
1415 | } | |
1416 | return 0; | |
1417 | } | |
1418 | ||
d1310b2e CM |
1419 | /* |
1420 | * helper function to set both pages and extents in the tree writeback | |
1421 | */ | |
b2950863 | 1422 | static int set_range_writeback(struct extent_io_tree *tree, u64 start, u64 end) |
d1310b2e CM |
1423 | { |
1424 | unsigned long index = start >> PAGE_CACHE_SHIFT; | |
1425 | unsigned long end_index = end >> PAGE_CACHE_SHIFT; | |
1426 | struct page *page; | |
1427 | ||
1428 | while (index <= end_index) { | |
1429 | page = find_get_page(tree->mapping, index); | |
79787eaa | 1430 | BUG_ON(!page); /* Pages should be in the extent_io_tree */ |
d1310b2e CM |
1431 | set_page_writeback(page); |
1432 | page_cache_release(page); | |
1433 | index++; | |
1434 | } | |
d1310b2e CM |
1435 | return 0; |
1436 | } | |
d1310b2e | 1437 | |
d352ac68 CM |
1438 | /* find the first state struct with 'bits' set after 'start', and |
1439 | * return it. tree->lock must be held. NULL will returned if | |
1440 | * nothing was found after 'start' | |
1441 | */ | |
48a3b636 ES |
1442 | static struct extent_state * |
1443 | find_first_extent_bit_state(struct extent_io_tree *tree, | |
9ee49a04 | 1444 | u64 start, unsigned bits) |
d7fc640e CM |
1445 | { |
1446 | struct rb_node *node; | |
1447 | struct extent_state *state; | |
1448 | ||
1449 | /* | |
1450 | * this search will find all the extents that end after | |
1451 | * our range starts. | |
1452 | */ | |
1453 | node = tree_search(tree, start); | |
d397712b | 1454 | if (!node) |
d7fc640e | 1455 | goto out; |
d7fc640e | 1456 | |
d397712b | 1457 | while (1) { |
d7fc640e | 1458 | state = rb_entry(node, struct extent_state, rb_node); |
d397712b | 1459 | if (state->end >= start && (state->state & bits)) |
d7fc640e | 1460 | return state; |
d397712b | 1461 | |
d7fc640e CM |
1462 | node = rb_next(node); |
1463 | if (!node) | |
1464 | break; | |
1465 | } | |
1466 | out: | |
1467 | return NULL; | |
1468 | } | |
d7fc640e | 1469 | |
69261c4b XG |
1470 | /* |
1471 | * find the first offset in the io tree with 'bits' set. zero is | |
1472 | * returned if we find something, and *start_ret and *end_ret are | |
1473 | * set to reflect the state struct that was found. | |
1474 | * | |
477d7eaf | 1475 | * If nothing was found, 1 is returned. If found something, return 0. |
69261c4b XG |
1476 | */ |
1477 | int find_first_extent_bit(struct extent_io_tree *tree, u64 start, | |
9ee49a04 | 1478 | u64 *start_ret, u64 *end_ret, unsigned bits, |
e6138876 | 1479 | struct extent_state **cached_state) |
69261c4b XG |
1480 | { |
1481 | struct extent_state *state; | |
e6138876 | 1482 | struct rb_node *n; |
69261c4b XG |
1483 | int ret = 1; |
1484 | ||
1485 | spin_lock(&tree->lock); | |
e6138876 JB |
1486 | if (cached_state && *cached_state) { |
1487 | state = *cached_state; | |
27a3507d | 1488 | if (state->end == start - 1 && extent_state_in_tree(state)) { |
e6138876 JB |
1489 | n = rb_next(&state->rb_node); |
1490 | while (n) { | |
1491 | state = rb_entry(n, struct extent_state, | |
1492 | rb_node); | |
1493 | if (state->state & bits) | |
1494 | goto got_it; | |
1495 | n = rb_next(n); | |
1496 | } | |
1497 | free_extent_state(*cached_state); | |
1498 | *cached_state = NULL; | |
1499 | goto out; | |
1500 | } | |
1501 | free_extent_state(*cached_state); | |
1502 | *cached_state = NULL; | |
1503 | } | |
1504 | ||
69261c4b | 1505 | state = find_first_extent_bit_state(tree, start, bits); |
e6138876 | 1506 | got_it: |
69261c4b | 1507 | if (state) { |
e38e2ed7 | 1508 | cache_state_if_flags(state, cached_state, 0); |
69261c4b XG |
1509 | *start_ret = state->start; |
1510 | *end_ret = state->end; | |
1511 | ret = 0; | |
1512 | } | |
e6138876 | 1513 | out: |
69261c4b XG |
1514 | spin_unlock(&tree->lock); |
1515 | return ret; | |
1516 | } | |
1517 | ||
d352ac68 CM |
1518 | /* |
1519 | * find a contiguous range of bytes in the file marked as delalloc, not | |
1520 | * more than 'max_bytes'. start and end are used to return the range, | |
1521 | * | |
1522 | * 1 is returned if we find something, 0 if nothing was in the tree | |
1523 | */ | |
c8b97818 | 1524 | static noinline u64 find_delalloc_range(struct extent_io_tree *tree, |
c2a128d2 JB |
1525 | u64 *start, u64 *end, u64 max_bytes, |
1526 | struct extent_state **cached_state) | |
d1310b2e CM |
1527 | { |
1528 | struct rb_node *node; | |
1529 | struct extent_state *state; | |
1530 | u64 cur_start = *start; | |
1531 | u64 found = 0; | |
1532 | u64 total_bytes = 0; | |
1533 | ||
cad321ad | 1534 | spin_lock(&tree->lock); |
c8b97818 | 1535 | |
d1310b2e CM |
1536 | /* |
1537 | * this search will find all the extents that end after | |
1538 | * our range starts. | |
1539 | */ | |
80ea96b1 | 1540 | node = tree_search(tree, cur_start); |
2b114d1d | 1541 | if (!node) { |
3b951516 CM |
1542 | if (!found) |
1543 | *end = (u64)-1; | |
d1310b2e CM |
1544 | goto out; |
1545 | } | |
1546 | ||
d397712b | 1547 | while (1) { |
d1310b2e | 1548 | state = rb_entry(node, struct extent_state, rb_node); |
5b21f2ed ZY |
1549 | if (found && (state->start != cur_start || |
1550 | (state->state & EXTENT_BOUNDARY))) { | |
d1310b2e CM |
1551 | goto out; |
1552 | } | |
1553 | if (!(state->state & EXTENT_DELALLOC)) { | |
1554 | if (!found) | |
1555 | *end = state->end; | |
1556 | goto out; | |
1557 | } | |
c2a128d2 | 1558 | if (!found) { |
d1310b2e | 1559 | *start = state->start; |
c2a128d2 JB |
1560 | *cached_state = state; |
1561 | atomic_inc(&state->refs); | |
1562 | } | |
d1310b2e CM |
1563 | found++; |
1564 | *end = state->end; | |
1565 | cur_start = state->end + 1; | |
1566 | node = rb_next(node); | |
d1310b2e | 1567 | total_bytes += state->end - state->start + 1; |
7bf811a5 | 1568 | if (total_bytes >= max_bytes) |
573aecaf | 1569 | break; |
573aecaf | 1570 | if (!node) |
d1310b2e CM |
1571 | break; |
1572 | } | |
1573 | out: | |
cad321ad | 1574 | spin_unlock(&tree->lock); |
d1310b2e CM |
1575 | return found; |
1576 | } | |
1577 | ||
143bede5 JM |
1578 | static noinline void __unlock_for_delalloc(struct inode *inode, |
1579 | struct page *locked_page, | |
1580 | u64 start, u64 end) | |
c8b97818 CM |
1581 | { |
1582 | int ret; | |
1583 | struct page *pages[16]; | |
1584 | unsigned long index = start >> PAGE_CACHE_SHIFT; | |
1585 | unsigned long end_index = end >> PAGE_CACHE_SHIFT; | |
1586 | unsigned long nr_pages = end_index - index + 1; | |
1587 | int i; | |
1588 | ||
1589 | if (index == locked_page->index && end_index == index) | |
143bede5 | 1590 | return; |
c8b97818 | 1591 | |
d397712b | 1592 | while (nr_pages > 0) { |
c8b97818 | 1593 | ret = find_get_pages_contig(inode->i_mapping, index, |
5b050f04 CM |
1594 | min_t(unsigned long, nr_pages, |
1595 | ARRAY_SIZE(pages)), pages); | |
c8b97818 CM |
1596 | for (i = 0; i < ret; i++) { |
1597 | if (pages[i] != locked_page) | |
1598 | unlock_page(pages[i]); | |
1599 | page_cache_release(pages[i]); | |
1600 | } | |
1601 | nr_pages -= ret; | |
1602 | index += ret; | |
1603 | cond_resched(); | |
1604 | } | |
c8b97818 CM |
1605 | } |
1606 | ||
1607 | static noinline int lock_delalloc_pages(struct inode *inode, | |
1608 | struct page *locked_page, | |
1609 | u64 delalloc_start, | |
1610 | u64 delalloc_end) | |
1611 | { | |
1612 | unsigned long index = delalloc_start >> PAGE_CACHE_SHIFT; | |
1613 | unsigned long start_index = index; | |
1614 | unsigned long end_index = delalloc_end >> PAGE_CACHE_SHIFT; | |
1615 | unsigned long pages_locked = 0; | |
1616 | struct page *pages[16]; | |
1617 | unsigned long nrpages; | |
1618 | int ret; | |
1619 | int i; | |
1620 | ||
1621 | /* the caller is responsible for locking the start index */ | |
1622 | if (index == locked_page->index && index == end_index) | |
1623 | return 0; | |
1624 | ||
1625 | /* skip the page at the start index */ | |
1626 | nrpages = end_index - index + 1; | |
d397712b | 1627 | while (nrpages > 0) { |
c8b97818 | 1628 | ret = find_get_pages_contig(inode->i_mapping, index, |
5b050f04 CM |
1629 | min_t(unsigned long, |
1630 | nrpages, ARRAY_SIZE(pages)), pages); | |
c8b97818 CM |
1631 | if (ret == 0) { |
1632 | ret = -EAGAIN; | |
1633 | goto done; | |
1634 | } | |
1635 | /* now we have an array of pages, lock them all */ | |
1636 | for (i = 0; i < ret; i++) { | |
1637 | /* | |
1638 | * the caller is taking responsibility for | |
1639 | * locked_page | |
1640 | */ | |
771ed689 | 1641 | if (pages[i] != locked_page) { |
c8b97818 | 1642 | lock_page(pages[i]); |
f2b1c41c CM |
1643 | if (!PageDirty(pages[i]) || |
1644 | pages[i]->mapping != inode->i_mapping) { | |
771ed689 CM |
1645 | ret = -EAGAIN; |
1646 | unlock_page(pages[i]); | |
1647 | page_cache_release(pages[i]); | |
1648 | goto done; | |
1649 | } | |
1650 | } | |
c8b97818 | 1651 | page_cache_release(pages[i]); |
771ed689 | 1652 | pages_locked++; |
c8b97818 | 1653 | } |
c8b97818 CM |
1654 | nrpages -= ret; |
1655 | index += ret; | |
1656 | cond_resched(); | |
1657 | } | |
1658 | ret = 0; | |
1659 | done: | |
1660 | if (ret && pages_locked) { | |
1661 | __unlock_for_delalloc(inode, locked_page, | |
1662 | delalloc_start, | |
1663 | ((u64)(start_index + pages_locked - 1)) << | |
1664 | PAGE_CACHE_SHIFT); | |
1665 | } | |
1666 | return ret; | |
1667 | } | |
1668 | ||
1669 | /* | |
1670 | * find a contiguous range of bytes in the file marked as delalloc, not | |
1671 | * more than 'max_bytes'. start and end are used to return the range, | |
1672 | * | |
1673 | * 1 is returned if we find something, 0 if nothing was in the tree | |
1674 | */ | |
294e30fe JB |
1675 | STATIC u64 find_lock_delalloc_range(struct inode *inode, |
1676 | struct extent_io_tree *tree, | |
1677 | struct page *locked_page, u64 *start, | |
1678 | u64 *end, u64 max_bytes) | |
c8b97818 CM |
1679 | { |
1680 | u64 delalloc_start; | |
1681 | u64 delalloc_end; | |
1682 | u64 found; | |
9655d298 | 1683 | struct extent_state *cached_state = NULL; |
c8b97818 CM |
1684 | int ret; |
1685 | int loops = 0; | |
1686 | ||
1687 | again: | |
1688 | /* step one, find a bunch of delalloc bytes starting at start */ | |
1689 | delalloc_start = *start; | |
1690 | delalloc_end = 0; | |
1691 | found = find_delalloc_range(tree, &delalloc_start, &delalloc_end, | |
c2a128d2 | 1692 | max_bytes, &cached_state); |
70b99e69 | 1693 | if (!found || delalloc_end <= *start) { |
c8b97818 CM |
1694 | *start = delalloc_start; |
1695 | *end = delalloc_end; | |
c2a128d2 | 1696 | free_extent_state(cached_state); |
385fe0be | 1697 | return 0; |
c8b97818 CM |
1698 | } |
1699 | ||
70b99e69 CM |
1700 | /* |
1701 | * start comes from the offset of locked_page. We have to lock | |
1702 | * pages in order, so we can't process delalloc bytes before | |
1703 | * locked_page | |
1704 | */ | |
d397712b | 1705 | if (delalloc_start < *start) |
70b99e69 | 1706 | delalloc_start = *start; |
70b99e69 | 1707 | |
c8b97818 CM |
1708 | /* |
1709 | * make sure to limit the number of pages we try to lock down | |
c8b97818 | 1710 | */ |
7bf811a5 JB |
1711 | if (delalloc_end + 1 - delalloc_start > max_bytes) |
1712 | delalloc_end = delalloc_start + max_bytes - 1; | |
d397712b | 1713 | |
c8b97818 CM |
1714 | /* step two, lock all the pages after the page that has start */ |
1715 | ret = lock_delalloc_pages(inode, locked_page, | |
1716 | delalloc_start, delalloc_end); | |
1717 | if (ret == -EAGAIN) { | |
1718 | /* some of the pages are gone, lets avoid looping by | |
1719 | * shortening the size of the delalloc range we're searching | |
1720 | */ | |
9655d298 | 1721 | free_extent_state(cached_state); |
7d788742 | 1722 | cached_state = NULL; |
c8b97818 | 1723 | if (!loops) { |
7bf811a5 | 1724 | max_bytes = PAGE_CACHE_SIZE; |
c8b97818 CM |
1725 | loops = 1; |
1726 | goto again; | |
1727 | } else { | |
1728 | found = 0; | |
1729 | goto out_failed; | |
1730 | } | |
1731 | } | |
79787eaa | 1732 | BUG_ON(ret); /* Only valid values are 0 and -EAGAIN */ |
c8b97818 CM |
1733 | |
1734 | /* step three, lock the state bits for the whole range */ | |
d0082371 | 1735 | lock_extent_bits(tree, delalloc_start, delalloc_end, 0, &cached_state); |
c8b97818 CM |
1736 | |
1737 | /* then test to make sure it is all still delalloc */ | |
1738 | ret = test_range_bit(tree, delalloc_start, delalloc_end, | |
9655d298 | 1739 | EXTENT_DELALLOC, 1, cached_state); |
c8b97818 | 1740 | if (!ret) { |
9655d298 CM |
1741 | unlock_extent_cached(tree, delalloc_start, delalloc_end, |
1742 | &cached_state, GFP_NOFS); | |
c8b97818 CM |
1743 | __unlock_for_delalloc(inode, locked_page, |
1744 | delalloc_start, delalloc_end); | |
1745 | cond_resched(); | |
1746 | goto again; | |
1747 | } | |
9655d298 | 1748 | free_extent_state(cached_state); |
c8b97818 CM |
1749 | *start = delalloc_start; |
1750 | *end = delalloc_end; | |
1751 | out_failed: | |
1752 | return found; | |
1753 | } | |
1754 | ||
c2790a2e JB |
1755 | int extent_clear_unlock_delalloc(struct inode *inode, u64 start, u64 end, |
1756 | struct page *locked_page, | |
9ee49a04 | 1757 | unsigned clear_bits, |
c2790a2e | 1758 | unsigned long page_ops) |
c8b97818 | 1759 | { |
c2790a2e | 1760 | struct extent_io_tree *tree = &BTRFS_I(inode)->io_tree; |
c8b97818 CM |
1761 | int ret; |
1762 | struct page *pages[16]; | |
1763 | unsigned long index = start >> PAGE_CACHE_SHIFT; | |
1764 | unsigned long end_index = end >> PAGE_CACHE_SHIFT; | |
1765 | unsigned long nr_pages = end_index - index + 1; | |
1766 | int i; | |
771ed689 | 1767 | |
2c64c53d | 1768 | clear_extent_bit(tree, start, end, clear_bits, 1, 0, NULL, GFP_NOFS); |
c2790a2e | 1769 | if (page_ops == 0) |
771ed689 | 1770 | return 0; |
c8b97818 | 1771 | |
704de49d FM |
1772 | if ((page_ops & PAGE_SET_ERROR) && nr_pages > 0) |
1773 | mapping_set_error(inode->i_mapping, -EIO); | |
1774 | ||
d397712b | 1775 | while (nr_pages > 0) { |
c8b97818 | 1776 | ret = find_get_pages_contig(inode->i_mapping, index, |
5b050f04 CM |
1777 | min_t(unsigned long, |
1778 | nr_pages, ARRAY_SIZE(pages)), pages); | |
c8b97818 | 1779 | for (i = 0; i < ret; i++) { |
8b62b72b | 1780 | |
c2790a2e | 1781 | if (page_ops & PAGE_SET_PRIVATE2) |
8b62b72b CM |
1782 | SetPagePrivate2(pages[i]); |
1783 | ||
c8b97818 CM |
1784 | if (pages[i] == locked_page) { |
1785 | page_cache_release(pages[i]); | |
1786 | continue; | |
1787 | } | |
c2790a2e | 1788 | if (page_ops & PAGE_CLEAR_DIRTY) |
c8b97818 | 1789 | clear_page_dirty_for_io(pages[i]); |
c2790a2e | 1790 | if (page_ops & PAGE_SET_WRITEBACK) |
c8b97818 | 1791 | set_page_writeback(pages[i]); |
704de49d FM |
1792 | if (page_ops & PAGE_SET_ERROR) |
1793 | SetPageError(pages[i]); | |
c2790a2e | 1794 | if (page_ops & PAGE_END_WRITEBACK) |
c8b97818 | 1795 | end_page_writeback(pages[i]); |
c2790a2e | 1796 | if (page_ops & PAGE_UNLOCK) |
771ed689 | 1797 | unlock_page(pages[i]); |
c8b97818 CM |
1798 | page_cache_release(pages[i]); |
1799 | } | |
1800 | nr_pages -= ret; | |
1801 | index += ret; | |
1802 | cond_resched(); | |
1803 | } | |
1804 | return 0; | |
1805 | } | |
c8b97818 | 1806 | |
d352ac68 CM |
1807 | /* |
1808 | * count the number of bytes in the tree that have a given bit(s) | |
1809 | * set. This can be fairly slow, except for EXTENT_DIRTY which is | |
1810 | * cached. The total number found is returned. | |
1811 | */ | |
d1310b2e CM |
1812 | u64 count_range_bits(struct extent_io_tree *tree, |
1813 | u64 *start, u64 search_end, u64 max_bytes, | |
9ee49a04 | 1814 | unsigned bits, int contig) |
d1310b2e CM |
1815 | { |
1816 | struct rb_node *node; | |
1817 | struct extent_state *state; | |
1818 | u64 cur_start = *start; | |
1819 | u64 total_bytes = 0; | |
ec29ed5b | 1820 | u64 last = 0; |
d1310b2e CM |
1821 | int found = 0; |
1822 | ||
fae7f21c | 1823 | if (WARN_ON(search_end <= cur_start)) |
d1310b2e | 1824 | return 0; |
d1310b2e | 1825 | |
cad321ad | 1826 | spin_lock(&tree->lock); |
d1310b2e CM |
1827 | if (cur_start == 0 && bits == EXTENT_DIRTY) { |
1828 | total_bytes = tree->dirty_bytes; | |
1829 | goto out; | |
1830 | } | |
1831 | /* | |
1832 | * this search will find all the extents that end after | |
1833 | * our range starts. | |
1834 | */ | |
80ea96b1 | 1835 | node = tree_search(tree, cur_start); |
d397712b | 1836 | if (!node) |
d1310b2e | 1837 | goto out; |
d1310b2e | 1838 | |
d397712b | 1839 | while (1) { |
d1310b2e CM |
1840 | state = rb_entry(node, struct extent_state, rb_node); |
1841 | if (state->start > search_end) | |
1842 | break; | |
ec29ed5b CM |
1843 | if (contig && found && state->start > last + 1) |
1844 | break; | |
1845 | if (state->end >= cur_start && (state->state & bits) == bits) { | |
d1310b2e CM |
1846 | total_bytes += min(search_end, state->end) + 1 - |
1847 | max(cur_start, state->start); | |
1848 | if (total_bytes >= max_bytes) | |
1849 | break; | |
1850 | if (!found) { | |
af60bed2 | 1851 | *start = max(cur_start, state->start); |
d1310b2e CM |
1852 | found = 1; |
1853 | } | |
ec29ed5b CM |
1854 | last = state->end; |
1855 | } else if (contig && found) { | |
1856 | break; | |
d1310b2e CM |
1857 | } |
1858 | node = rb_next(node); | |
1859 | if (!node) | |
1860 | break; | |
1861 | } | |
1862 | out: | |
cad321ad | 1863 | spin_unlock(&tree->lock); |
d1310b2e CM |
1864 | return total_bytes; |
1865 | } | |
b2950863 | 1866 | |
d352ac68 CM |
1867 | /* |
1868 | * set the private field for a given byte offset in the tree. If there isn't | |
1869 | * an extent_state there already, this does nothing. | |
1870 | */ | |
171170c1 | 1871 | static int set_state_private(struct extent_io_tree *tree, u64 start, u64 private) |
d1310b2e CM |
1872 | { |
1873 | struct rb_node *node; | |
1874 | struct extent_state *state; | |
1875 | int ret = 0; | |
1876 | ||
cad321ad | 1877 | spin_lock(&tree->lock); |
d1310b2e CM |
1878 | /* |
1879 | * this search will find all the extents that end after | |
1880 | * our range starts. | |
1881 | */ | |
80ea96b1 | 1882 | node = tree_search(tree, start); |
2b114d1d | 1883 | if (!node) { |
d1310b2e CM |
1884 | ret = -ENOENT; |
1885 | goto out; | |
1886 | } | |
1887 | state = rb_entry(node, struct extent_state, rb_node); | |
1888 | if (state->start != start) { | |
1889 | ret = -ENOENT; | |
1890 | goto out; | |
1891 | } | |
1892 | state->private = private; | |
1893 | out: | |
cad321ad | 1894 | spin_unlock(&tree->lock); |
d1310b2e CM |
1895 | return ret; |
1896 | } | |
1897 | ||
1898 | int get_state_private(struct extent_io_tree *tree, u64 start, u64 *private) | |
1899 | { | |
1900 | struct rb_node *node; | |
1901 | struct extent_state *state; | |
1902 | int ret = 0; | |
1903 | ||
cad321ad | 1904 | spin_lock(&tree->lock); |
d1310b2e CM |
1905 | /* |
1906 | * this search will find all the extents that end after | |
1907 | * our range starts. | |
1908 | */ | |
80ea96b1 | 1909 | node = tree_search(tree, start); |
2b114d1d | 1910 | if (!node) { |
d1310b2e CM |
1911 | ret = -ENOENT; |
1912 | goto out; | |
1913 | } | |
1914 | state = rb_entry(node, struct extent_state, rb_node); | |
1915 | if (state->start != start) { | |
1916 | ret = -ENOENT; | |
1917 | goto out; | |
1918 | } | |
1919 | *private = state->private; | |
1920 | out: | |
cad321ad | 1921 | spin_unlock(&tree->lock); |
d1310b2e CM |
1922 | return ret; |
1923 | } | |
1924 | ||
1925 | /* | |
1926 | * searches a range in the state tree for a given mask. | |
70dec807 | 1927 | * If 'filled' == 1, this returns 1 only if every extent in the tree |
d1310b2e CM |
1928 | * has the bits set. Otherwise, 1 is returned if any bit in the |
1929 | * range is found set. | |
1930 | */ | |
1931 | int test_range_bit(struct extent_io_tree *tree, u64 start, u64 end, | |
9ee49a04 | 1932 | unsigned bits, int filled, struct extent_state *cached) |
d1310b2e CM |
1933 | { |
1934 | struct extent_state *state = NULL; | |
1935 | struct rb_node *node; | |
1936 | int bitset = 0; | |
d1310b2e | 1937 | |
cad321ad | 1938 | spin_lock(&tree->lock); |
27a3507d | 1939 | if (cached && extent_state_in_tree(cached) && cached->start <= start && |
df98b6e2 | 1940 | cached->end > start) |
9655d298 CM |
1941 | node = &cached->rb_node; |
1942 | else | |
1943 | node = tree_search(tree, start); | |
d1310b2e CM |
1944 | while (node && start <= end) { |
1945 | state = rb_entry(node, struct extent_state, rb_node); | |
1946 | ||
1947 | if (filled && state->start > start) { | |
1948 | bitset = 0; | |
1949 | break; | |
1950 | } | |
1951 | ||
1952 | if (state->start > end) | |
1953 | break; | |
1954 | ||
1955 | if (state->state & bits) { | |
1956 | bitset = 1; | |
1957 | if (!filled) | |
1958 | break; | |
1959 | } else if (filled) { | |
1960 | bitset = 0; | |
1961 | break; | |
1962 | } | |
46562cec CM |
1963 | |
1964 | if (state->end == (u64)-1) | |
1965 | break; | |
1966 | ||
d1310b2e CM |
1967 | start = state->end + 1; |
1968 | if (start > end) | |
1969 | break; | |
1970 | node = rb_next(node); | |
1971 | if (!node) { | |
1972 | if (filled) | |
1973 | bitset = 0; | |
1974 | break; | |
1975 | } | |
1976 | } | |
cad321ad | 1977 | spin_unlock(&tree->lock); |
d1310b2e CM |
1978 | return bitset; |
1979 | } | |
d1310b2e CM |
1980 | |
1981 | /* | |
1982 | * helper function to set a given page up to date if all the | |
1983 | * extents in the tree for that page are up to date | |
1984 | */ | |
143bede5 | 1985 | static void check_page_uptodate(struct extent_io_tree *tree, struct page *page) |
d1310b2e | 1986 | { |
4eee4fa4 | 1987 | u64 start = page_offset(page); |
d1310b2e | 1988 | u64 end = start + PAGE_CACHE_SIZE - 1; |
9655d298 | 1989 | if (test_range_bit(tree, start, end, EXTENT_UPTODATE, 1, NULL)) |
d1310b2e | 1990 | SetPageUptodate(page); |
d1310b2e CM |
1991 | } |
1992 | ||
8b110e39 | 1993 | int free_io_failure(struct inode *inode, struct io_failure_record *rec) |
4a54c8c1 JS |
1994 | { |
1995 | int ret; | |
1996 | int err = 0; | |
1997 | struct extent_io_tree *failure_tree = &BTRFS_I(inode)->io_failure_tree; | |
1998 | ||
1999 | set_state_private(failure_tree, rec->start, 0); | |
2000 | ret = clear_extent_bits(failure_tree, rec->start, | |
2001 | rec->start + rec->len - 1, | |
2002 | EXTENT_LOCKED | EXTENT_DIRTY, GFP_NOFS); | |
2003 | if (ret) | |
2004 | err = ret; | |
2005 | ||
53b381b3 DW |
2006 | ret = clear_extent_bits(&BTRFS_I(inode)->io_tree, rec->start, |
2007 | rec->start + rec->len - 1, | |
2008 | EXTENT_DAMAGED, GFP_NOFS); | |
2009 | if (ret && !err) | |
2010 | err = ret; | |
4a54c8c1 JS |
2011 | |
2012 | kfree(rec); | |
2013 | return err; | |
2014 | } | |
2015 | ||
4a54c8c1 JS |
2016 | /* |
2017 | * this bypasses the standard btrfs submit functions deliberately, as | |
2018 | * the standard behavior is to write all copies in a raid setup. here we only | |
2019 | * want to write the one bad copy. so we do the mapping for ourselves and issue | |
2020 | * submit_bio directly. | |
3ec706c8 | 2021 | * to avoid any synchronization issues, wait for the data after writing, which |
4a54c8c1 JS |
2022 | * actually prevents the read that triggered the error from finishing. |
2023 | * currently, there can be no more than two copies of every data bit. thus, | |
2024 | * exactly one rewrite is required. | |
2025 | */ | |
1203b681 MX |
2026 | int repair_io_failure(struct inode *inode, u64 start, u64 length, u64 logical, |
2027 | struct page *page, unsigned int pg_offset, int mirror_num) | |
4a54c8c1 | 2028 | { |
1203b681 | 2029 | struct btrfs_fs_info *fs_info = BTRFS_I(inode)->root->fs_info; |
4a54c8c1 JS |
2030 | struct bio *bio; |
2031 | struct btrfs_device *dev; | |
4a54c8c1 JS |
2032 | u64 map_length = 0; |
2033 | u64 sector; | |
2034 | struct btrfs_bio *bbio = NULL; | |
53b381b3 | 2035 | struct btrfs_mapping_tree *map_tree = &fs_info->mapping_tree; |
4a54c8c1 JS |
2036 | int ret; |
2037 | ||
908960c6 | 2038 | ASSERT(!(fs_info->sb->s_flags & MS_RDONLY)); |
4a54c8c1 JS |
2039 | BUG_ON(!mirror_num); |
2040 | ||
53b381b3 DW |
2041 | /* we can't repair anything in raid56 yet */ |
2042 | if (btrfs_is_parity_mirror(map_tree, logical, length, mirror_num)) | |
2043 | return 0; | |
2044 | ||
9be3395b | 2045 | bio = btrfs_io_bio_alloc(GFP_NOFS, 1); |
4a54c8c1 JS |
2046 | if (!bio) |
2047 | return -EIO; | |
4f024f37 | 2048 | bio->bi_iter.bi_size = 0; |
4a54c8c1 JS |
2049 | map_length = length; |
2050 | ||
3ec706c8 | 2051 | ret = btrfs_map_block(fs_info, WRITE, logical, |
4a54c8c1 JS |
2052 | &map_length, &bbio, mirror_num); |
2053 | if (ret) { | |
2054 | bio_put(bio); | |
2055 | return -EIO; | |
2056 | } | |
2057 | BUG_ON(mirror_num != bbio->mirror_num); | |
2058 | sector = bbio->stripes[mirror_num-1].physical >> 9; | |
4f024f37 | 2059 | bio->bi_iter.bi_sector = sector; |
4a54c8c1 | 2060 | dev = bbio->stripes[mirror_num-1].dev; |
6e9606d2 | 2061 | btrfs_put_bbio(bbio); |
4a54c8c1 JS |
2062 | if (!dev || !dev->bdev || !dev->writeable) { |
2063 | bio_put(bio); | |
2064 | return -EIO; | |
2065 | } | |
2066 | bio->bi_bdev = dev->bdev; | |
ffdd2018 | 2067 | bio_add_page(bio, page, length, pg_offset); |
4a54c8c1 | 2068 | |
33879d45 | 2069 | if (btrfsic_submit_bio_wait(WRITE_SYNC, bio)) { |
4a54c8c1 JS |
2070 | /* try to remap that extent elsewhere? */ |
2071 | bio_put(bio); | |
442a4f63 | 2072 | btrfs_dev_stat_inc_and_print(dev, BTRFS_DEV_STAT_WRITE_ERRS); |
4a54c8c1 JS |
2073 | return -EIO; |
2074 | } | |
2075 | ||
efe120a0 | 2076 | printk_ratelimited_in_rcu(KERN_INFO |
1203b681 MX |
2077 | "BTRFS: read error corrected: ino %llu off %llu (dev %s sector %llu)\n", |
2078 | btrfs_ino(inode), start, | |
2079 | rcu_str_deref(dev->name), sector); | |
4a54c8c1 JS |
2080 | bio_put(bio); |
2081 | return 0; | |
2082 | } | |
2083 | ||
ea466794 JB |
2084 | int repair_eb_io_failure(struct btrfs_root *root, struct extent_buffer *eb, |
2085 | int mirror_num) | |
2086 | { | |
ea466794 JB |
2087 | u64 start = eb->start; |
2088 | unsigned long i, num_pages = num_extent_pages(eb->start, eb->len); | |
d95603b2 | 2089 | int ret = 0; |
ea466794 | 2090 | |
908960c6 ID |
2091 | if (root->fs_info->sb->s_flags & MS_RDONLY) |
2092 | return -EROFS; | |
2093 | ||
ea466794 | 2094 | for (i = 0; i < num_pages; i++) { |
fb85fc9a | 2095 | struct page *p = eb->pages[i]; |
1203b681 MX |
2096 | |
2097 | ret = repair_io_failure(root->fs_info->btree_inode, start, | |
2098 | PAGE_CACHE_SIZE, start, p, | |
2099 | start - page_offset(p), mirror_num); | |
ea466794 JB |
2100 | if (ret) |
2101 | break; | |
2102 | start += PAGE_CACHE_SIZE; | |
2103 | } | |
2104 | ||
2105 | return ret; | |
2106 | } | |
2107 | ||
4a54c8c1 JS |
2108 | /* |
2109 | * each time an IO finishes, we do a fast check in the IO failure tree | |
2110 | * to see if we need to process or clean up an io_failure_record | |
2111 | */ | |
8b110e39 MX |
2112 | int clean_io_failure(struct inode *inode, u64 start, struct page *page, |
2113 | unsigned int pg_offset) | |
4a54c8c1 JS |
2114 | { |
2115 | u64 private; | |
2116 | u64 private_failure; | |
2117 | struct io_failure_record *failrec; | |
908960c6 | 2118 | struct btrfs_fs_info *fs_info = BTRFS_I(inode)->root->fs_info; |
4a54c8c1 JS |
2119 | struct extent_state *state; |
2120 | int num_copies; | |
4a54c8c1 | 2121 | int ret; |
4a54c8c1 JS |
2122 | |
2123 | private = 0; | |
2124 | ret = count_range_bits(&BTRFS_I(inode)->io_failure_tree, &private, | |
2125 | (u64)-1, 1, EXTENT_DIRTY, 0); | |
2126 | if (!ret) | |
2127 | return 0; | |
2128 | ||
2129 | ret = get_state_private(&BTRFS_I(inode)->io_failure_tree, start, | |
2130 | &private_failure); | |
2131 | if (ret) | |
2132 | return 0; | |
2133 | ||
2134 | failrec = (struct io_failure_record *)(unsigned long) private_failure; | |
2135 | BUG_ON(!failrec->this_mirror); | |
2136 | ||
2137 | if (failrec->in_validation) { | |
2138 | /* there was no real error, just free the record */ | |
2139 | pr_debug("clean_io_failure: freeing dummy error at %llu\n", | |
2140 | failrec->start); | |
4a54c8c1 JS |
2141 | goto out; |
2142 | } | |
908960c6 ID |
2143 | if (fs_info->sb->s_flags & MS_RDONLY) |
2144 | goto out; | |
4a54c8c1 JS |
2145 | |
2146 | spin_lock(&BTRFS_I(inode)->io_tree.lock); | |
2147 | state = find_first_extent_bit_state(&BTRFS_I(inode)->io_tree, | |
2148 | failrec->start, | |
2149 | EXTENT_LOCKED); | |
2150 | spin_unlock(&BTRFS_I(inode)->io_tree.lock); | |
2151 | ||
883d0de4 MX |
2152 | if (state && state->start <= failrec->start && |
2153 | state->end >= failrec->start + failrec->len - 1) { | |
3ec706c8 SB |
2154 | num_copies = btrfs_num_copies(fs_info, failrec->logical, |
2155 | failrec->len); | |
4a54c8c1 | 2156 | if (num_copies > 1) { |
1203b681 | 2157 | repair_io_failure(inode, start, failrec->len, |
454ff3de | 2158 | failrec->logical, page, |
1203b681 | 2159 | pg_offset, failrec->failed_mirror); |
4a54c8c1 JS |
2160 | } |
2161 | } | |
2162 | ||
2163 | out: | |
454ff3de | 2164 | free_io_failure(inode, failrec); |
4a54c8c1 | 2165 | |
454ff3de | 2166 | return 0; |
4a54c8c1 JS |
2167 | } |
2168 | ||
f612496b MX |
2169 | /* |
2170 | * Can be called when | |
2171 | * - hold extent lock | |
2172 | * - under ordered extent | |
2173 | * - the inode is freeing | |
2174 | */ | |
2175 | void btrfs_free_io_failure_record(struct inode *inode, u64 start, u64 end) | |
2176 | { | |
2177 | struct extent_io_tree *failure_tree = &BTRFS_I(inode)->io_failure_tree; | |
2178 | struct io_failure_record *failrec; | |
2179 | struct extent_state *state, *next; | |
2180 | ||
2181 | if (RB_EMPTY_ROOT(&failure_tree->state)) | |
2182 | return; | |
2183 | ||
2184 | spin_lock(&failure_tree->lock); | |
2185 | state = find_first_extent_bit_state(failure_tree, start, EXTENT_DIRTY); | |
2186 | while (state) { | |
2187 | if (state->start > end) | |
2188 | break; | |
2189 | ||
2190 | ASSERT(state->end <= end); | |
2191 | ||
2192 | next = next_state(state); | |
2193 | ||
6e1103a6 | 2194 | failrec = (struct io_failure_record *)(unsigned long)state->private; |
f612496b MX |
2195 | free_extent_state(state); |
2196 | kfree(failrec); | |
2197 | ||
2198 | state = next; | |
2199 | } | |
2200 | spin_unlock(&failure_tree->lock); | |
2201 | } | |
2202 | ||
2fe6303e MX |
2203 | int btrfs_get_io_failure_record(struct inode *inode, u64 start, u64 end, |
2204 | struct io_failure_record **failrec_ret) | |
4a54c8c1 | 2205 | { |
2fe6303e | 2206 | struct io_failure_record *failrec; |
4a54c8c1 JS |
2207 | u64 private; |
2208 | struct extent_map *em; | |
4a54c8c1 JS |
2209 | struct extent_io_tree *failure_tree = &BTRFS_I(inode)->io_failure_tree; |
2210 | struct extent_io_tree *tree = &BTRFS_I(inode)->io_tree; | |
2211 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; | |
4a54c8c1 | 2212 | int ret; |
4a54c8c1 JS |
2213 | u64 logical; |
2214 | ||
4a54c8c1 JS |
2215 | ret = get_state_private(failure_tree, start, &private); |
2216 | if (ret) { | |
2217 | failrec = kzalloc(sizeof(*failrec), GFP_NOFS); | |
2218 | if (!failrec) | |
2219 | return -ENOMEM; | |
2fe6303e | 2220 | |
4a54c8c1 JS |
2221 | failrec->start = start; |
2222 | failrec->len = end - start + 1; | |
2223 | failrec->this_mirror = 0; | |
2224 | failrec->bio_flags = 0; | |
2225 | failrec->in_validation = 0; | |
2226 | ||
2227 | read_lock(&em_tree->lock); | |
2228 | em = lookup_extent_mapping(em_tree, start, failrec->len); | |
2229 | if (!em) { | |
2230 | read_unlock(&em_tree->lock); | |
2231 | kfree(failrec); | |
2232 | return -EIO; | |
2233 | } | |
2234 | ||
68ba990f | 2235 | if (em->start > start || em->start + em->len <= start) { |
4a54c8c1 JS |
2236 | free_extent_map(em); |
2237 | em = NULL; | |
2238 | } | |
2239 | read_unlock(&em_tree->lock); | |
7a2d6a64 | 2240 | if (!em) { |
4a54c8c1 JS |
2241 | kfree(failrec); |
2242 | return -EIO; | |
2243 | } | |
2fe6303e | 2244 | |
4a54c8c1 JS |
2245 | logical = start - em->start; |
2246 | logical = em->block_start + logical; | |
2247 | if (test_bit(EXTENT_FLAG_COMPRESSED, &em->flags)) { | |
2248 | logical = em->block_start; | |
2249 | failrec->bio_flags = EXTENT_BIO_COMPRESSED; | |
2250 | extent_set_compress_type(&failrec->bio_flags, | |
2251 | em->compress_type); | |
2252 | } | |
2fe6303e MX |
2253 | |
2254 | pr_debug("Get IO Failure Record: (new) logical=%llu, start=%llu, len=%llu\n", | |
2255 | logical, start, failrec->len); | |
2256 | ||
4a54c8c1 JS |
2257 | failrec->logical = logical; |
2258 | free_extent_map(em); | |
2259 | ||
2260 | /* set the bits in the private failure tree */ | |
2261 | ret = set_extent_bits(failure_tree, start, end, | |
2262 | EXTENT_LOCKED | EXTENT_DIRTY, GFP_NOFS); | |
2263 | if (ret >= 0) | |
2264 | ret = set_state_private(failure_tree, start, | |
2265 | (u64)(unsigned long)failrec); | |
2266 | /* set the bits in the inode's tree */ | |
2267 | if (ret >= 0) | |
2268 | ret = set_extent_bits(tree, start, end, EXTENT_DAMAGED, | |
2269 | GFP_NOFS); | |
2270 | if (ret < 0) { | |
2271 | kfree(failrec); | |
2272 | return ret; | |
2273 | } | |
2274 | } else { | |
2275 | failrec = (struct io_failure_record *)(unsigned long)private; | |
2fe6303e | 2276 | pr_debug("Get IO Failure Record: (found) logical=%llu, start=%llu, len=%llu, validation=%d\n", |
4a54c8c1 JS |
2277 | failrec->logical, failrec->start, failrec->len, |
2278 | failrec->in_validation); | |
2279 | /* | |
2280 | * when data can be on disk more than twice, add to failrec here | |
2281 | * (e.g. with a list for failed_mirror) to make | |
2282 | * clean_io_failure() clean all those errors at once. | |
2283 | */ | |
2284 | } | |
2fe6303e MX |
2285 | |
2286 | *failrec_ret = failrec; | |
2287 | ||
2288 | return 0; | |
2289 | } | |
2290 | ||
2291 | int btrfs_check_repairable(struct inode *inode, struct bio *failed_bio, | |
2292 | struct io_failure_record *failrec, int failed_mirror) | |
2293 | { | |
2294 | int num_copies; | |
2295 | ||
5d964051 SB |
2296 | num_copies = btrfs_num_copies(BTRFS_I(inode)->root->fs_info, |
2297 | failrec->logical, failrec->len); | |
4a54c8c1 JS |
2298 | if (num_copies == 1) { |
2299 | /* | |
2300 | * we only have a single copy of the data, so don't bother with | |
2301 | * all the retry and error correction code that follows. no | |
2302 | * matter what the error is, it is very likely to persist. | |
2303 | */ | |
2fe6303e | 2304 | pr_debug("Check Repairable: cannot repair, num_copies=%d, next_mirror %d, failed_mirror %d\n", |
09a7f7a2 | 2305 | num_copies, failrec->this_mirror, failed_mirror); |
2fe6303e | 2306 | return 0; |
4a54c8c1 JS |
2307 | } |
2308 | ||
4a54c8c1 JS |
2309 | /* |
2310 | * there are two premises: | |
2311 | * a) deliver good data to the caller | |
2312 | * b) correct the bad sectors on disk | |
2313 | */ | |
2314 | if (failed_bio->bi_vcnt > 1) { | |
2315 | /* | |
2316 | * to fulfill b), we need to know the exact failing sectors, as | |
2317 | * we don't want to rewrite any more than the failed ones. thus, | |
2318 | * we need separate read requests for the failed bio | |
2319 | * | |
2320 | * if the following BUG_ON triggers, our validation request got | |
2321 | * merged. we need separate requests for our algorithm to work. | |
2322 | */ | |
2323 | BUG_ON(failrec->in_validation); | |
2324 | failrec->in_validation = 1; | |
2325 | failrec->this_mirror = failed_mirror; | |
4a54c8c1 JS |
2326 | } else { |
2327 | /* | |
2328 | * we're ready to fulfill a) and b) alongside. get a good copy | |
2329 | * of the failed sector and if we succeed, we have setup | |
2330 | * everything for repair_io_failure to do the rest for us. | |
2331 | */ | |
2332 | if (failrec->in_validation) { | |
2333 | BUG_ON(failrec->this_mirror != failed_mirror); | |
2334 | failrec->in_validation = 0; | |
2335 | failrec->this_mirror = 0; | |
2336 | } | |
2337 | failrec->failed_mirror = failed_mirror; | |
2338 | failrec->this_mirror++; | |
2339 | if (failrec->this_mirror == failed_mirror) | |
2340 | failrec->this_mirror++; | |
4a54c8c1 JS |
2341 | } |
2342 | ||
facc8a22 | 2343 | if (failrec->this_mirror > num_copies) { |
2fe6303e | 2344 | pr_debug("Check Repairable: (fail) num_copies=%d, next_mirror %d, failed_mirror %d\n", |
4a54c8c1 | 2345 | num_copies, failrec->this_mirror, failed_mirror); |
2fe6303e | 2346 | return 0; |
4a54c8c1 JS |
2347 | } |
2348 | ||
2fe6303e MX |
2349 | return 1; |
2350 | } | |
2351 | ||
2352 | ||
2353 | struct bio *btrfs_create_repair_bio(struct inode *inode, struct bio *failed_bio, | |
2354 | struct io_failure_record *failrec, | |
2355 | struct page *page, int pg_offset, int icsum, | |
8b110e39 | 2356 | bio_end_io_t *endio_func, void *data) |
2fe6303e MX |
2357 | { |
2358 | struct bio *bio; | |
2359 | struct btrfs_io_bio *btrfs_failed_bio; | |
2360 | struct btrfs_io_bio *btrfs_bio; | |
2361 | ||
9be3395b | 2362 | bio = btrfs_io_bio_alloc(GFP_NOFS, 1); |
2fe6303e MX |
2363 | if (!bio) |
2364 | return NULL; | |
2365 | ||
2366 | bio->bi_end_io = endio_func; | |
4f024f37 | 2367 | bio->bi_iter.bi_sector = failrec->logical >> 9; |
4a54c8c1 | 2368 | bio->bi_bdev = BTRFS_I(inode)->root->fs_info->fs_devices->latest_bdev; |
4f024f37 | 2369 | bio->bi_iter.bi_size = 0; |
8b110e39 | 2370 | bio->bi_private = data; |
4a54c8c1 | 2371 | |
facc8a22 MX |
2372 | btrfs_failed_bio = btrfs_io_bio(failed_bio); |
2373 | if (btrfs_failed_bio->csum) { | |
2374 | struct btrfs_fs_info *fs_info = BTRFS_I(inode)->root->fs_info; | |
2375 | u16 csum_size = btrfs_super_csum_size(fs_info->super_copy); | |
2376 | ||
2377 | btrfs_bio = btrfs_io_bio(bio); | |
2378 | btrfs_bio->csum = btrfs_bio->csum_inline; | |
2fe6303e MX |
2379 | icsum *= csum_size; |
2380 | memcpy(btrfs_bio->csum, btrfs_failed_bio->csum + icsum, | |
facc8a22 MX |
2381 | csum_size); |
2382 | } | |
2383 | ||
2fe6303e MX |
2384 | bio_add_page(bio, page, failrec->len, pg_offset); |
2385 | ||
2386 | return bio; | |
2387 | } | |
2388 | ||
2389 | /* | |
2390 | * this is a generic handler for readpage errors (default | |
2391 | * readpage_io_failed_hook). if other copies exist, read those and write back | |
2392 | * good data to the failed position. does not investigate in remapping the | |
2393 | * failed extent elsewhere, hoping the device will be smart enough to do this as | |
2394 | * needed | |
2395 | */ | |
2396 | ||
2397 | static int bio_readpage_error(struct bio *failed_bio, u64 phy_offset, | |
2398 | struct page *page, u64 start, u64 end, | |
2399 | int failed_mirror) | |
2400 | { | |
2401 | struct io_failure_record *failrec; | |
2402 | struct inode *inode = page->mapping->host; | |
2403 | struct extent_io_tree *tree = &BTRFS_I(inode)->io_tree; | |
2404 | struct bio *bio; | |
2405 | int read_mode; | |
2406 | int ret; | |
2407 | ||
2408 | BUG_ON(failed_bio->bi_rw & REQ_WRITE); | |
2409 | ||
2410 | ret = btrfs_get_io_failure_record(inode, start, end, &failrec); | |
2411 | if (ret) | |
2412 | return ret; | |
2413 | ||
2414 | ret = btrfs_check_repairable(inode, failed_bio, failrec, failed_mirror); | |
2415 | if (!ret) { | |
2416 | free_io_failure(inode, failrec); | |
2417 | return -EIO; | |
2418 | } | |
2419 | ||
2420 | if (failed_bio->bi_vcnt > 1) | |
2421 | read_mode = READ_SYNC | REQ_FAILFAST_DEV; | |
2422 | else | |
2423 | read_mode = READ_SYNC; | |
2424 | ||
2425 | phy_offset >>= inode->i_sb->s_blocksize_bits; | |
2426 | bio = btrfs_create_repair_bio(inode, failed_bio, failrec, page, | |
2427 | start - page_offset(page), | |
8b110e39 MX |
2428 | (int)phy_offset, failed_bio->bi_end_io, |
2429 | NULL); | |
2fe6303e MX |
2430 | if (!bio) { |
2431 | free_io_failure(inode, failrec); | |
2432 | return -EIO; | |
2433 | } | |
4a54c8c1 | 2434 | |
2fe6303e MX |
2435 | pr_debug("Repair Read Error: submitting new read[%#x] to this_mirror=%d, in_validation=%d\n", |
2436 | read_mode, failrec->this_mirror, failrec->in_validation); | |
4a54c8c1 | 2437 | |
013bd4c3 TI |
2438 | ret = tree->ops->submit_bio_hook(inode, read_mode, bio, |
2439 | failrec->this_mirror, | |
2440 | failrec->bio_flags, 0); | |
6c387ab2 | 2441 | if (ret) { |
454ff3de | 2442 | free_io_failure(inode, failrec); |
6c387ab2 MX |
2443 | bio_put(bio); |
2444 | } | |
2445 | ||
013bd4c3 | 2446 | return ret; |
4a54c8c1 JS |
2447 | } |
2448 | ||
d1310b2e CM |
2449 | /* lots and lots of room for performance fixes in the end_bio funcs */ |
2450 | ||
87826df0 JM |
2451 | int end_extent_writepage(struct page *page, int err, u64 start, u64 end) |
2452 | { | |
2453 | int uptodate = (err == 0); | |
2454 | struct extent_io_tree *tree; | |
3e2426bd | 2455 | int ret = 0; |
87826df0 JM |
2456 | |
2457 | tree = &BTRFS_I(page->mapping->host)->io_tree; | |
2458 | ||
2459 | if (tree->ops && tree->ops->writepage_end_io_hook) { | |
2460 | ret = tree->ops->writepage_end_io_hook(page, start, | |
2461 | end, NULL, uptodate); | |
2462 | if (ret) | |
2463 | uptodate = 0; | |
2464 | } | |
2465 | ||
87826df0 | 2466 | if (!uptodate) { |
87826df0 JM |
2467 | ClearPageUptodate(page); |
2468 | SetPageError(page); | |
5dca6eea LB |
2469 | ret = ret < 0 ? ret : -EIO; |
2470 | mapping_set_error(page->mapping, ret); | |
87826df0 JM |
2471 | } |
2472 | return 0; | |
2473 | } | |
2474 | ||
d1310b2e CM |
2475 | /* |
2476 | * after a writepage IO is done, we need to: | |
2477 | * clear the uptodate bits on error | |
2478 | * clear the writeback bits in the extent tree for this IO | |
2479 | * end_page_writeback if the page has no more pending IO | |
2480 | * | |
2481 | * Scheduling is not allowed, so the extent state tree is expected | |
2482 | * to have one and only one object corresponding to this IO. | |
2483 | */ | |
d1310b2e | 2484 | static void end_bio_extent_writepage(struct bio *bio, int err) |
d1310b2e | 2485 | { |
2c30c71b | 2486 | struct bio_vec *bvec; |
d1310b2e CM |
2487 | u64 start; |
2488 | u64 end; | |
2c30c71b | 2489 | int i; |
d1310b2e | 2490 | |
2c30c71b | 2491 | bio_for_each_segment_all(bvec, bio, i) { |
d1310b2e | 2492 | struct page *page = bvec->bv_page; |
902b22f3 | 2493 | |
17a5adcc AO |
2494 | /* We always issue full-page reads, but if some block |
2495 | * in a page fails to read, blk_update_request() will | |
2496 | * advance bv_offset and adjust bv_len to compensate. | |
2497 | * Print a warning for nonzero offsets, and an error | |
2498 | * if they don't add up to a full page. */ | |
efe120a0 FH |
2499 | if (bvec->bv_offset || bvec->bv_len != PAGE_CACHE_SIZE) { |
2500 | if (bvec->bv_offset + bvec->bv_len != PAGE_CACHE_SIZE) | |
2501 | btrfs_err(BTRFS_I(page->mapping->host)->root->fs_info, | |
2502 | "partial page write in btrfs with offset %u and length %u", | |
2503 | bvec->bv_offset, bvec->bv_len); | |
2504 | else | |
2505 | btrfs_info(BTRFS_I(page->mapping->host)->root->fs_info, | |
2506 | "incomplete page write in btrfs with offset %u and " | |
2507 | "length %u", | |
2508 | bvec->bv_offset, bvec->bv_len); | |
2509 | } | |
d1310b2e | 2510 | |
17a5adcc AO |
2511 | start = page_offset(page); |
2512 | end = start + bvec->bv_offset + bvec->bv_len - 1; | |
d1310b2e | 2513 | |
87826df0 JM |
2514 | if (end_extent_writepage(page, err, start, end)) |
2515 | continue; | |
70dec807 | 2516 | |
17a5adcc | 2517 | end_page_writeback(page); |
2c30c71b | 2518 | } |
2b1f55b0 | 2519 | |
d1310b2e | 2520 | bio_put(bio); |
d1310b2e CM |
2521 | } |
2522 | ||
883d0de4 MX |
2523 | static void |
2524 | endio_readpage_release_extent(struct extent_io_tree *tree, u64 start, u64 len, | |
2525 | int uptodate) | |
2526 | { | |
2527 | struct extent_state *cached = NULL; | |
2528 | u64 end = start + len - 1; | |
2529 | ||
2530 | if (uptodate && tree->track_uptodate) | |
2531 | set_extent_uptodate(tree, start, end, &cached, GFP_ATOMIC); | |
2532 | unlock_extent_cached(tree, start, end, &cached, GFP_ATOMIC); | |
2533 | } | |
2534 | ||
d1310b2e CM |
2535 | /* |
2536 | * after a readpage IO is done, we need to: | |
2537 | * clear the uptodate bits on error | |
2538 | * set the uptodate bits if things worked | |
2539 | * set the page up to date if all extents in the tree are uptodate | |
2540 | * clear the lock bit in the extent tree | |
2541 | * unlock the page if there are no other extents locked for it | |
2542 | * | |
2543 | * Scheduling is not allowed, so the extent state tree is expected | |
2544 | * to have one and only one object corresponding to this IO. | |
2545 | */ | |
d1310b2e | 2546 | static void end_bio_extent_readpage(struct bio *bio, int err) |
d1310b2e | 2547 | { |
2c30c71b | 2548 | struct bio_vec *bvec; |
d1310b2e | 2549 | int uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags); |
facc8a22 | 2550 | struct btrfs_io_bio *io_bio = btrfs_io_bio(bio); |
902b22f3 | 2551 | struct extent_io_tree *tree; |
facc8a22 | 2552 | u64 offset = 0; |
d1310b2e CM |
2553 | u64 start; |
2554 | u64 end; | |
facc8a22 | 2555 | u64 len; |
883d0de4 MX |
2556 | u64 extent_start = 0; |
2557 | u64 extent_len = 0; | |
5cf1ab56 | 2558 | int mirror; |
d1310b2e | 2559 | int ret; |
2c30c71b | 2560 | int i; |
d1310b2e | 2561 | |
d20f7043 CM |
2562 | if (err) |
2563 | uptodate = 0; | |
2564 | ||
2c30c71b | 2565 | bio_for_each_segment_all(bvec, bio, i) { |
d1310b2e | 2566 | struct page *page = bvec->bv_page; |
a71754fc | 2567 | struct inode *inode = page->mapping->host; |
507903b8 | 2568 | |
be3940c0 | 2569 | pr_debug("end_bio_extent_readpage: bi_sector=%llu, err=%d, " |
c1dc0896 | 2570 | "mirror=%u\n", (u64)bio->bi_iter.bi_sector, err, |
9be3395b | 2571 | io_bio->mirror_num); |
a71754fc | 2572 | tree = &BTRFS_I(inode)->io_tree; |
902b22f3 | 2573 | |
17a5adcc AO |
2574 | /* We always issue full-page reads, but if some block |
2575 | * in a page fails to read, blk_update_request() will | |
2576 | * advance bv_offset and adjust bv_len to compensate. | |
2577 | * Print a warning for nonzero offsets, and an error | |
2578 | * if they don't add up to a full page. */ | |
efe120a0 FH |
2579 | if (bvec->bv_offset || bvec->bv_len != PAGE_CACHE_SIZE) { |
2580 | if (bvec->bv_offset + bvec->bv_len != PAGE_CACHE_SIZE) | |
2581 | btrfs_err(BTRFS_I(page->mapping->host)->root->fs_info, | |
2582 | "partial page read in btrfs with offset %u and length %u", | |
2583 | bvec->bv_offset, bvec->bv_len); | |
2584 | else | |
2585 | btrfs_info(BTRFS_I(page->mapping->host)->root->fs_info, | |
2586 | "incomplete page read in btrfs with offset %u and " | |
2587 | "length %u", | |
2588 | bvec->bv_offset, bvec->bv_len); | |
2589 | } | |
d1310b2e | 2590 | |
17a5adcc AO |
2591 | start = page_offset(page); |
2592 | end = start + bvec->bv_offset + bvec->bv_len - 1; | |
facc8a22 | 2593 | len = bvec->bv_len; |
d1310b2e | 2594 | |
9be3395b | 2595 | mirror = io_bio->mirror_num; |
f2a09da9 MX |
2596 | if (likely(uptodate && tree->ops && |
2597 | tree->ops->readpage_end_io_hook)) { | |
facc8a22 MX |
2598 | ret = tree->ops->readpage_end_io_hook(io_bio, offset, |
2599 | page, start, end, | |
2600 | mirror); | |
5ee0844d | 2601 | if (ret) |
d1310b2e | 2602 | uptodate = 0; |
5ee0844d | 2603 | else |
1203b681 | 2604 | clean_io_failure(inode, start, page, 0); |
d1310b2e | 2605 | } |
ea466794 | 2606 | |
f2a09da9 MX |
2607 | if (likely(uptodate)) |
2608 | goto readpage_ok; | |
2609 | ||
2610 | if (tree->ops && tree->ops->readpage_io_failed_hook) { | |
5cf1ab56 | 2611 | ret = tree->ops->readpage_io_failed_hook(page, mirror); |
ea466794 JB |
2612 | if (!ret && !err && |
2613 | test_bit(BIO_UPTODATE, &bio->bi_flags)) | |
2614 | uptodate = 1; | |
f2a09da9 | 2615 | } else { |
f4a8e656 JS |
2616 | /* |
2617 | * The generic bio_readpage_error handles errors the | |
2618 | * following way: If possible, new read requests are | |
2619 | * created and submitted and will end up in | |
2620 | * end_bio_extent_readpage as well (if we're lucky, not | |
2621 | * in the !uptodate case). In that case it returns 0 and | |
2622 | * we just go on with the next page in our bio. If it | |
2623 | * can't handle the error it will return -EIO and we | |
2624 | * remain responsible for that page. | |
2625 | */ | |
facc8a22 MX |
2626 | ret = bio_readpage_error(bio, offset, page, start, end, |
2627 | mirror); | |
7e38326f | 2628 | if (ret == 0) { |
3b951516 CM |
2629 | uptodate = |
2630 | test_bit(BIO_UPTODATE, &bio->bi_flags); | |
d20f7043 CM |
2631 | if (err) |
2632 | uptodate = 0; | |
38c1c2e4 | 2633 | offset += len; |
7e38326f CM |
2634 | continue; |
2635 | } | |
2636 | } | |
f2a09da9 | 2637 | readpage_ok: |
883d0de4 | 2638 | if (likely(uptodate)) { |
a71754fc JB |
2639 | loff_t i_size = i_size_read(inode); |
2640 | pgoff_t end_index = i_size >> PAGE_CACHE_SHIFT; | |
a583c026 | 2641 | unsigned off; |
a71754fc JB |
2642 | |
2643 | /* Zero out the end if this page straddles i_size */ | |
a583c026 LB |
2644 | off = i_size & (PAGE_CACHE_SIZE-1); |
2645 | if (page->index == end_index && off) | |
2646 | zero_user_segment(page, off, PAGE_CACHE_SIZE); | |
17a5adcc | 2647 | SetPageUptodate(page); |
70dec807 | 2648 | } else { |
17a5adcc AO |
2649 | ClearPageUptodate(page); |
2650 | SetPageError(page); | |
70dec807 | 2651 | } |
17a5adcc | 2652 | unlock_page(page); |
facc8a22 | 2653 | offset += len; |
883d0de4 MX |
2654 | |
2655 | if (unlikely(!uptodate)) { | |
2656 | if (extent_len) { | |
2657 | endio_readpage_release_extent(tree, | |
2658 | extent_start, | |
2659 | extent_len, 1); | |
2660 | extent_start = 0; | |
2661 | extent_len = 0; | |
2662 | } | |
2663 | endio_readpage_release_extent(tree, start, | |
2664 | end - start + 1, 0); | |
2665 | } else if (!extent_len) { | |
2666 | extent_start = start; | |
2667 | extent_len = end + 1 - start; | |
2668 | } else if (extent_start + extent_len == start) { | |
2669 | extent_len += end + 1 - start; | |
2670 | } else { | |
2671 | endio_readpage_release_extent(tree, extent_start, | |
2672 | extent_len, uptodate); | |
2673 | extent_start = start; | |
2674 | extent_len = end + 1 - start; | |
2675 | } | |
2c30c71b | 2676 | } |
d1310b2e | 2677 | |
883d0de4 MX |
2678 | if (extent_len) |
2679 | endio_readpage_release_extent(tree, extent_start, extent_len, | |
2680 | uptodate); | |
facc8a22 MX |
2681 | if (io_bio->end_io) |
2682 | io_bio->end_io(io_bio, err); | |
d1310b2e | 2683 | bio_put(bio); |
d1310b2e CM |
2684 | } |
2685 | ||
9be3395b CM |
2686 | /* |
2687 | * this allocates from the btrfs_bioset. We're returning a bio right now | |
2688 | * but you can call btrfs_io_bio for the appropriate container_of magic | |
2689 | */ | |
88f794ed MX |
2690 | struct bio * |
2691 | btrfs_bio_alloc(struct block_device *bdev, u64 first_sector, int nr_vecs, | |
2692 | gfp_t gfp_flags) | |
d1310b2e | 2693 | { |
facc8a22 | 2694 | struct btrfs_io_bio *btrfs_bio; |
d1310b2e CM |
2695 | struct bio *bio; |
2696 | ||
9be3395b | 2697 | bio = bio_alloc_bioset(gfp_flags, nr_vecs, btrfs_bioset); |
d1310b2e CM |
2698 | |
2699 | if (bio == NULL && (current->flags & PF_MEMALLOC)) { | |
9be3395b CM |
2700 | while (!bio && (nr_vecs /= 2)) { |
2701 | bio = bio_alloc_bioset(gfp_flags, | |
2702 | nr_vecs, btrfs_bioset); | |
2703 | } | |
d1310b2e CM |
2704 | } |
2705 | ||
2706 | if (bio) { | |
2707 | bio->bi_bdev = bdev; | |
4f024f37 | 2708 | bio->bi_iter.bi_sector = first_sector; |
facc8a22 MX |
2709 | btrfs_bio = btrfs_io_bio(bio); |
2710 | btrfs_bio->csum = NULL; | |
2711 | btrfs_bio->csum_allocated = NULL; | |
2712 | btrfs_bio->end_io = NULL; | |
d1310b2e CM |
2713 | } |
2714 | return bio; | |
2715 | } | |
2716 | ||
9be3395b CM |
2717 | struct bio *btrfs_bio_clone(struct bio *bio, gfp_t gfp_mask) |
2718 | { | |
23ea8e5a MX |
2719 | struct btrfs_io_bio *btrfs_bio; |
2720 | struct bio *new; | |
9be3395b | 2721 | |
23ea8e5a MX |
2722 | new = bio_clone_bioset(bio, gfp_mask, btrfs_bioset); |
2723 | if (new) { | |
2724 | btrfs_bio = btrfs_io_bio(new); | |
2725 | btrfs_bio->csum = NULL; | |
2726 | btrfs_bio->csum_allocated = NULL; | |
2727 | btrfs_bio->end_io = NULL; | |
2728 | } | |
2729 | return new; | |
2730 | } | |
9be3395b CM |
2731 | |
2732 | /* this also allocates from the btrfs_bioset */ | |
2733 | struct bio *btrfs_io_bio_alloc(gfp_t gfp_mask, unsigned int nr_iovecs) | |
2734 | { | |
facc8a22 MX |
2735 | struct btrfs_io_bio *btrfs_bio; |
2736 | struct bio *bio; | |
2737 | ||
2738 | bio = bio_alloc_bioset(gfp_mask, nr_iovecs, btrfs_bioset); | |
2739 | if (bio) { | |
2740 | btrfs_bio = btrfs_io_bio(bio); | |
2741 | btrfs_bio->csum = NULL; | |
2742 | btrfs_bio->csum_allocated = NULL; | |
2743 | btrfs_bio->end_io = NULL; | |
2744 | } | |
2745 | return bio; | |
9be3395b CM |
2746 | } |
2747 | ||
2748 | ||
355808c2 JM |
2749 | static int __must_check submit_one_bio(int rw, struct bio *bio, |
2750 | int mirror_num, unsigned long bio_flags) | |
d1310b2e | 2751 | { |
d1310b2e | 2752 | int ret = 0; |
70dec807 CM |
2753 | struct bio_vec *bvec = bio->bi_io_vec + bio->bi_vcnt - 1; |
2754 | struct page *page = bvec->bv_page; | |
2755 | struct extent_io_tree *tree = bio->bi_private; | |
70dec807 | 2756 | u64 start; |
70dec807 | 2757 | |
4eee4fa4 | 2758 | start = page_offset(page) + bvec->bv_offset; |
70dec807 | 2759 | |
902b22f3 | 2760 | bio->bi_private = NULL; |
d1310b2e CM |
2761 | |
2762 | bio_get(bio); | |
2763 | ||
065631f6 | 2764 | if (tree->ops && tree->ops->submit_bio_hook) |
6b82ce8d | 2765 | ret = tree->ops->submit_bio_hook(page->mapping->host, rw, bio, |
eaf25d93 | 2766 | mirror_num, bio_flags, start); |
0b86a832 | 2767 | else |
21adbd5c | 2768 | btrfsic_submit_bio(rw, bio); |
4a54c8c1 | 2769 | |
d1310b2e CM |
2770 | if (bio_flagged(bio, BIO_EOPNOTSUPP)) |
2771 | ret = -EOPNOTSUPP; | |
2772 | bio_put(bio); | |
2773 | return ret; | |
2774 | } | |
2775 | ||
64a16701 | 2776 | static int merge_bio(int rw, struct extent_io_tree *tree, struct page *page, |
3444a972 JM |
2777 | unsigned long offset, size_t size, struct bio *bio, |
2778 | unsigned long bio_flags) | |
2779 | { | |
2780 | int ret = 0; | |
2781 | if (tree->ops && tree->ops->merge_bio_hook) | |
64a16701 | 2782 | ret = tree->ops->merge_bio_hook(rw, page, offset, size, bio, |
3444a972 JM |
2783 | bio_flags); |
2784 | BUG_ON(ret < 0); | |
2785 | return ret; | |
2786 | ||
2787 | } | |
2788 | ||
d1310b2e CM |
2789 | static int submit_extent_page(int rw, struct extent_io_tree *tree, |
2790 | struct page *page, sector_t sector, | |
2791 | size_t size, unsigned long offset, | |
2792 | struct block_device *bdev, | |
2793 | struct bio **bio_ret, | |
2794 | unsigned long max_pages, | |
f188591e | 2795 | bio_end_io_t end_io_func, |
c8b97818 CM |
2796 | int mirror_num, |
2797 | unsigned long prev_bio_flags, | |
2798 | unsigned long bio_flags) | |
d1310b2e CM |
2799 | { |
2800 | int ret = 0; | |
2801 | struct bio *bio; | |
2802 | int nr; | |
c8b97818 CM |
2803 | int contig = 0; |
2804 | int this_compressed = bio_flags & EXTENT_BIO_COMPRESSED; | |
2805 | int old_compressed = prev_bio_flags & EXTENT_BIO_COMPRESSED; | |
5b050f04 | 2806 | size_t page_size = min_t(size_t, size, PAGE_CACHE_SIZE); |
d1310b2e CM |
2807 | |
2808 | if (bio_ret && *bio_ret) { | |
2809 | bio = *bio_ret; | |
c8b97818 | 2810 | if (old_compressed) |
4f024f37 | 2811 | contig = bio->bi_iter.bi_sector == sector; |
c8b97818 | 2812 | else |
f73a1c7d | 2813 | contig = bio_end_sector(bio) == sector; |
c8b97818 CM |
2814 | |
2815 | if (prev_bio_flags != bio_flags || !contig || | |
64a16701 | 2816 | merge_bio(rw, tree, page, offset, page_size, bio, bio_flags) || |
c8b97818 CM |
2817 | bio_add_page(bio, page, page_size, offset) < page_size) { |
2818 | ret = submit_one_bio(rw, bio, mirror_num, | |
2819 | prev_bio_flags); | |
289454ad NA |
2820 | if (ret < 0) { |
2821 | *bio_ret = NULL; | |
79787eaa | 2822 | return ret; |
289454ad | 2823 | } |
d1310b2e CM |
2824 | bio = NULL; |
2825 | } else { | |
2826 | return 0; | |
2827 | } | |
2828 | } | |
c8b97818 CM |
2829 | if (this_compressed) |
2830 | nr = BIO_MAX_PAGES; | |
2831 | else | |
2832 | nr = bio_get_nr_vecs(bdev); | |
2833 | ||
88f794ed | 2834 | bio = btrfs_bio_alloc(bdev, sector, nr, GFP_NOFS | __GFP_HIGH); |
5df67083 TI |
2835 | if (!bio) |
2836 | return -ENOMEM; | |
70dec807 | 2837 | |
c8b97818 | 2838 | bio_add_page(bio, page, page_size, offset); |
d1310b2e CM |
2839 | bio->bi_end_io = end_io_func; |
2840 | bio->bi_private = tree; | |
70dec807 | 2841 | |
d397712b | 2842 | if (bio_ret) |
d1310b2e | 2843 | *bio_ret = bio; |
d397712b | 2844 | else |
c8b97818 | 2845 | ret = submit_one_bio(rw, bio, mirror_num, bio_flags); |
d1310b2e CM |
2846 | |
2847 | return ret; | |
2848 | } | |
2849 | ||
48a3b636 ES |
2850 | static void attach_extent_buffer_page(struct extent_buffer *eb, |
2851 | struct page *page) | |
d1310b2e CM |
2852 | { |
2853 | if (!PagePrivate(page)) { | |
2854 | SetPagePrivate(page); | |
d1310b2e | 2855 | page_cache_get(page); |
4f2de97a JB |
2856 | set_page_private(page, (unsigned long)eb); |
2857 | } else { | |
2858 | WARN_ON(page->private != (unsigned long)eb); | |
d1310b2e CM |
2859 | } |
2860 | } | |
2861 | ||
4f2de97a | 2862 | void set_page_extent_mapped(struct page *page) |
d1310b2e | 2863 | { |
4f2de97a JB |
2864 | if (!PagePrivate(page)) { |
2865 | SetPagePrivate(page); | |
2866 | page_cache_get(page); | |
2867 | set_page_private(page, EXTENT_PAGE_PRIVATE); | |
2868 | } | |
d1310b2e CM |
2869 | } |
2870 | ||
125bac01 MX |
2871 | static struct extent_map * |
2872 | __get_extent_map(struct inode *inode, struct page *page, size_t pg_offset, | |
2873 | u64 start, u64 len, get_extent_t *get_extent, | |
2874 | struct extent_map **em_cached) | |
2875 | { | |
2876 | struct extent_map *em; | |
2877 | ||
2878 | if (em_cached && *em_cached) { | |
2879 | em = *em_cached; | |
cbc0e928 | 2880 | if (extent_map_in_tree(em) && start >= em->start && |
125bac01 MX |
2881 | start < extent_map_end(em)) { |
2882 | atomic_inc(&em->refs); | |
2883 | return em; | |
2884 | } | |
2885 | ||
2886 | free_extent_map(em); | |
2887 | *em_cached = NULL; | |
2888 | } | |
2889 | ||
2890 | em = get_extent(inode, page, pg_offset, start, len, 0); | |
2891 | if (em_cached && !IS_ERR_OR_NULL(em)) { | |
2892 | BUG_ON(*em_cached); | |
2893 | atomic_inc(&em->refs); | |
2894 | *em_cached = em; | |
2895 | } | |
2896 | return em; | |
2897 | } | |
d1310b2e CM |
2898 | /* |
2899 | * basic readpage implementation. Locked extent state structs are inserted | |
2900 | * into the tree that are removed when the IO is done (by the end_io | |
2901 | * handlers) | |
79787eaa | 2902 | * XXX JDM: This needs looking at to ensure proper page locking |
d1310b2e | 2903 | */ |
9974090b MX |
2904 | static int __do_readpage(struct extent_io_tree *tree, |
2905 | struct page *page, | |
2906 | get_extent_t *get_extent, | |
125bac01 | 2907 | struct extent_map **em_cached, |
9974090b MX |
2908 | struct bio **bio, int mirror_num, |
2909 | unsigned long *bio_flags, int rw) | |
d1310b2e CM |
2910 | { |
2911 | struct inode *inode = page->mapping->host; | |
4eee4fa4 | 2912 | u64 start = page_offset(page); |
d1310b2e CM |
2913 | u64 page_end = start + PAGE_CACHE_SIZE - 1; |
2914 | u64 end; | |
2915 | u64 cur = start; | |
2916 | u64 extent_offset; | |
2917 | u64 last_byte = i_size_read(inode); | |
2918 | u64 block_start; | |
2919 | u64 cur_end; | |
2920 | sector_t sector; | |
2921 | struct extent_map *em; | |
2922 | struct block_device *bdev; | |
2923 | int ret; | |
2924 | int nr = 0; | |
4b384318 | 2925 | int parent_locked = *bio_flags & EXTENT_BIO_PARENT_LOCKED; |
306e16ce | 2926 | size_t pg_offset = 0; |
d1310b2e | 2927 | size_t iosize; |
c8b97818 | 2928 | size_t disk_io_size; |
d1310b2e | 2929 | size_t blocksize = inode->i_sb->s_blocksize; |
4b384318 | 2930 | unsigned long this_bio_flag = *bio_flags & EXTENT_BIO_PARENT_LOCKED; |
d1310b2e CM |
2931 | |
2932 | set_page_extent_mapped(page); | |
2933 | ||
9974090b | 2934 | end = page_end; |
90a887c9 DM |
2935 | if (!PageUptodate(page)) { |
2936 | if (cleancache_get_page(page) == 0) { | |
2937 | BUG_ON(blocksize != PAGE_SIZE); | |
9974090b | 2938 | unlock_extent(tree, start, end); |
90a887c9 DM |
2939 | goto out; |
2940 | } | |
2941 | } | |
2942 | ||
c8b97818 CM |
2943 | if (page->index == last_byte >> PAGE_CACHE_SHIFT) { |
2944 | char *userpage; | |
2945 | size_t zero_offset = last_byte & (PAGE_CACHE_SIZE - 1); | |
2946 | ||
2947 | if (zero_offset) { | |
2948 | iosize = PAGE_CACHE_SIZE - zero_offset; | |
7ac687d9 | 2949 | userpage = kmap_atomic(page); |
c8b97818 CM |
2950 | memset(userpage + zero_offset, 0, iosize); |
2951 | flush_dcache_page(page); | |
7ac687d9 | 2952 | kunmap_atomic(userpage); |
c8b97818 CM |
2953 | } |
2954 | } | |
d1310b2e | 2955 | while (cur <= end) { |
c8f2f24b JB |
2956 | unsigned long pnr = (last_byte >> PAGE_CACHE_SHIFT) + 1; |
2957 | ||
d1310b2e CM |
2958 | if (cur >= last_byte) { |
2959 | char *userpage; | |
507903b8 AJ |
2960 | struct extent_state *cached = NULL; |
2961 | ||
306e16ce | 2962 | iosize = PAGE_CACHE_SIZE - pg_offset; |
7ac687d9 | 2963 | userpage = kmap_atomic(page); |
306e16ce | 2964 | memset(userpage + pg_offset, 0, iosize); |
d1310b2e | 2965 | flush_dcache_page(page); |
7ac687d9 | 2966 | kunmap_atomic(userpage); |
d1310b2e | 2967 | set_extent_uptodate(tree, cur, cur + iosize - 1, |
507903b8 | 2968 | &cached, GFP_NOFS); |
4b384318 MF |
2969 | if (!parent_locked) |
2970 | unlock_extent_cached(tree, cur, | |
2971 | cur + iosize - 1, | |
2972 | &cached, GFP_NOFS); | |
d1310b2e CM |
2973 | break; |
2974 | } | |
125bac01 MX |
2975 | em = __get_extent_map(inode, page, pg_offset, cur, |
2976 | end - cur + 1, get_extent, em_cached); | |
c704005d | 2977 | if (IS_ERR_OR_NULL(em)) { |
d1310b2e | 2978 | SetPageError(page); |
4b384318 MF |
2979 | if (!parent_locked) |
2980 | unlock_extent(tree, cur, end); | |
d1310b2e CM |
2981 | break; |
2982 | } | |
d1310b2e CM |
2983 | extent_offset = cur - em->start; |
2984 | BUG_ON(extent_map_end(em) <= cur); | |
2985 | BUG_ON(end < cur); | |
2986 | ||
261507a0 | 2987 | if (test_bit(EXTENT_FLAG_COMPRESSED, &em->flags)) { |
4b384318 | 2988 | this_bio_flag |= EXTENT_BIO_COMPRESSED; |
261507a0 LZ |
2989 | extent_set_compress_type(&this_bio_flag, |
2990 | em->compress_type); | |
2991 | } | |
c8b97818 | 2992 | |
d1310b2e CM |
2993 | iosize = min(extent_map_end(em) - cur, end - cur + 1); |
2994 | cur_end = min(extent_map_end(em) - 1, end); | |
fda2832f | 2995 | iosize = ALIGN(iosize, blocksize); |
c8b97818 CM |
2996 | if (this_bio_flag & EXTENT_BIO_COMPRESSED) { |
2997 | disk_io_size = em->block_len; | |
2998 | sector = em->block_start >> 9; | |
2999 | } else { | |
3000 | sector = (em->block_start + extent_offset) >> 9; | |
3001 | disk_io_size = iosize; | |
3002 | } | |
d1310b2e CM |
3003 | bdev = em->bdev; |
3004 | block_start = em->block_start; | |
d899e052 YZ |
3005 | if (test_bit(EXTENT_FLAG_PREALLOC, &em->flags)) |
3006 | block_start = EXTENT_MAP_HOLE; | |
d1310b2e CM |
3007 | free_extent_map(em); |
3008 | em = NULL; | |
3009 | ||
3010 | /* we've found a hole, just zero and go on */ | |
3011 | if (block_start == EXTENT_MAP_HOLE) { | |
3012 | char *userpage; | |
507903b8 AJ |
3013 | struct extent_state *cached = NULL; |
3014 | ||
7ac687d9 | 3015 | userpage = kmap_atomic(page); |
306e16ce | 3016 | memset(userpage + pg_offset, 0, iosize); |
d1310b2e | 3017 | flush_dcache_page(page); |
7ac687d9 | 3018 | kunmap_atomic(userpage); |
d1310b2e CM |
3019 | |
3020 | set_extent_uptodate(tree, cur, cur + iosize - 1, | |
507903b8 AJ |
3021 | &cached, GFP_NOFS); |
3022 | unlock_extent_cached(tree, cur, cur + iosize - 1, | |
3023 | &cached, GFP_NOFS); | |
d1310b2e | 3024 | cur = cur + iosize; |
306e16ce | 3025 | pg_offset += iosize; |
d1310b2e CM |
3026 | continue; |
3027 | } | |
3028 | /* the get_extent function already copied into the page */ | |
9655d298 CM |
3029 | if (test_range_bit(tree, cur, cur_end, |
3030 | EXTENT_UPTODATE, 1, NULL)) { | |
a1b32a59 | 3031 | check_page_uptodate(tree, page); |
4b384318 MF |
3032 | if (!parent_locked) |
3033 | unlock_extent(tree, cur, cur + iosize - 1); | |
d1310b2e | 3034 | cur = cur + iosize; |
306e16ce | 3035 | pg_offset += iosize; |
d1310b2e CM |
3036 | continue; |
3037 | } | |
70dec807 CM |
3038 | /* we have an inline extent but it didn't get marked up |
3039 | * to date. Error out | |
3040 | */ | |
3041 | if (block_start == EXTENT_MAP_INLINE) { | |
3042 | SetPageError(page); | |
4b384318 MF |
3043 | if (!parent_locked) |
3044 | unlock_extent(tree, cur, cur + iosize - 1); | |
70dec807 | 3045 | cur = cur + iosize; |
306e16ce | 3046 | pg_offset += iosize; |
70dec807 CM |
3047 | continue; |
3048 | } | |
d1310b2e | 3049 | |
c8f2f24b | 3050 | pnr -= page->index; |
d4c7ca86 | 3051 | ret = submit_extent_page(rw, tree, page, |
306e16ce | 3052 | sector, disk_io_size, pg_offset, |
89642229 | 3053 | bdev, bio, pnr, |
c8b97818 CM |
3054 | end_bio_extent_readpage, mirror_num, |
3055 | *bio_flags, | |
3056 | this_bio_flag); | |
c8f2f24b JB |
3057 | if (!ret) { |
3058 | nr++; | |
3059 | *bio_flags = this_bio_flag; | |
3060 | } else { | |
d1310b2e | 3061 | SetPageError(page); |
4b384318 MF |
3062 | if (!parent_locked) |
3063 | unlock_extent(tree, cur, cur + iosize - 1); | |
edd33c99 | 3064 | } |
d1310b2e | 3065 | cur = cur + iosize; |
306e16ce | 3066 | pg_offset += iosize; |
d1310b2e | 3067 | } |
90a887c9 | 3068 | out: |
d1310b2e CM |
3069 | if (!nr) { |
3070 | if (!PageError(page)) | |
3071 | SetPageUptodate(page); | |
3072 | unlock_page(page); | |
3073 | } | |
3074 | return 0; | |
3075 | } | |
3076 | ||
9974090b MX |
3077 | static inline void __do_contiguous_readpages(struct extent_io_tree *tree, |
3078 | struct page *pages[], int nr_pages, | |
3079 | u64 start, u64 end, | |
3080 | get_extent_t *get_extent, | |
125bac01 | 3081 | struct extent_map **em_cached, |
9974090b MX |
3082 | struct bio **bio, int mirror_num, |
3083 | unsigned long *bio_flags, int rw) | |
3084 | { | |
3085 | struct inode *inode; | |
3086 | struct btrfs_ordered_extent *ordered; | |
3087 | int index; | |
3088 | ||
3089 | inode = pages[0]->mapping->host; | |
3090 | while (1) { | |
3091 | lock_extent(tree, start, end); | |
3092 | ordered = btrfs_lookup_ordered_range(inode, start, | |
3093 | end - start + 1); | |
3094 | if (!ordered) | |
3095 | break; | |
3096 | unlock_extent(tree, start, end); | |
3097 | btrfs_start_ordered_extent(inode, ordered, 1); | |
3098 | btrfs_put_ordered_extent(ordered); | |
3099 | } | |
3100 | ||
3101 | for (index = 0; index < nr_pages; index++) { | |
125bac01 MX |
3102 | __do_readpage(tree, pages[index], get_extent, em_cached, bio, |
3103 | mirror_num, bio_flags, rw); | |
9974090b MX |
3104 | page_cache_release(pages[index]); |
3105 | } | |
3106 | } | |
3107 | ||
3108 | static void __extent_readpages(struct extent_io_tree *tree, | |
3109 | struct page *pages[], | |
3110 | int nr_pages, get_extent_t *get_extent, | |
125bac01 | 3111 | struct extent_map **em_cached, |
9974090b MX |
3112 | struct bio **bio, int mirror_num, |
3113 | unsigned long *bio_flags, int rw) | |
3114 | { | |
35a3621b | 3115 | u64 start = 0; |
9974090b MX |
3116 | u64 end = 0; |
3117 | u64 page_start; | |
3118 | int index; | |
35a3621b | 3119 | int first_index = 0; |
9974090b MX |
3120 | |
3121 | for (index = 0; index < nr_pages; index++) { | |
3122 | page_start = page_offset(pages[index]); | |
3123 | if (!end) { | |
3124 | start = page_start; | |
3125 | end = start + PAGE_CACHE_SIZE - 1; | |
3126 | first_index = index; | |
3127 | } else if (end + 1 == page_start) { | |
3128 | end += PAGE_CACHE_SIZE; | |
3129 | } else { | |
3130 | __do_contiguous_readpages(tree, &pages[first_index], | |
3131 | index - first_index, start, | |
125bac01 MX |
3132 | end, get_extent, em_cached, |
3133 | bio, mirror_num, bio_flags, | |
3134 | rw); | |
9974090b MX |
3135 | start = page_start; |
3136 | end = start + PAGE_CACHE_SIZE - 1; | |
3137 | first_index = index; | |
3138 | } | |
3139 | } | |
3140 | ||
3141 | if (end) | |
3142 | __do_contiguous_readpages(tree, &pages[first_index], | |
3143 | index - first_index, start, | |
125bac01 | 3144 | end, get_extent, em_cached, bio, |
9974090b MX |
3145 | mirror_num, bio_flags, rw); |
3146 | } | |
3147 | ||
3148 | static int __extent_read_full_page(struct extent_io_tree *tree, | |
3149 | struct page *page, | |
3150 | get_extent_t *get_extent, | |
3151 | struct bio **bio, int mirror_num, | |
3152 | unsigned long *bio_flags, int rw) | |
3153 | { | |
3154 | struct inode *inode = page->mapping->host; | |
3155 | struct btrfs_ordered_extent *ordered; | |
3156 | u64 start = page_offset(page); | |
3157 | u64 end = start + PAGE_CACHE_SIZE - 1; | |
3158 | int ret; | |
3159 | ||
3160 | while (1) { | |
3161 | lock_extent(tree, start, end); | |
3162 | ordered = btrfs_lookup_ordered_extent(inode, start); | |
3163 | if (!ordered) | |
3164 | break; | |
3165 | unlock_extent(tree, start, end); | |
3166 | btrfs_start_ordered_extent(inode, ordered, 1); | |
3167 | btrfs_put_ordered_extent(ordered); | |
3168 | } | |
3169 | ||
125bac01 MX |
3170 | ret = __do_readpage(tree, page, get_extent, NULL, bio, mirror_num, |
3171 | bio_flags, rw); | |
9974090b MX |
3172 | return ret; |
3173 | } | |
3174 | ||
d1310b2e | 3175 | int extent_read_full_page(struct extent_io_tree *tree, struct page *page, |
8ddc7d9c | 3176 | get_extent_t *get_extent, int mirror_num) |
d1310b2e CM |
3177 | { |
3178 | struct bio *bio = NULL; | |
c8b97818 | 3179 | unsigned long bio_flags = 0; |
d1310b2e CM |
3180 | int ret; |
3181 | ||
8ddc7d9c | 3182 | ret = __extent_read_full_page(tree, page, get_extent, &bio, mirror_num, |
d4c7ca86 | 3183 | &bio_flags, READ); |
d1310b2e | 3184 | if (bio) |
8ddc7d9c | 3185 | ret = submit_one_bio(READ, bio, mirror_num, bio_flags); |
d1310b2e CM |
3186 | return ret; |
3187 | } | |
d1310b2e | 3188 | |
4b384318 MF |
3189 | int extent_read_full_page_nolock(struct extent_io_tree *tree, struct page *page, |
3190 | get_extent_t *get_extent, int mirror_num) | |
3191 | { | |
3192 | struct bio *bio = NULL; | |
3193 | unsigned long bio_flags = EXTENT_BIO_PARENT_LOCKED; | |
3194 | int ret; | |
3195 | ||
3196 | ret = __do_readpage(tree, page, get_extent, NULL, &bio, mirror_num, | |
3197 | &bio_flags, READ); | |
3198 | if (bio) | |
3199 | ret = submit_one_bio(READ, bio, mirror_num, bio_flags); | |
3200 | return ret; | |
3201 | } | |
3202 | ||
11c8349b CM |
3203 | static noinline void update_nr_written(struct page *page, |
3204 | struct writeback_control *wbc, | |
3205 | unsigned long nr_written) | |
3206 | { | |
3207 | wbc->nr_to_write -= nr_written; | |
3208 | if (wbc->range_cyclic || (wbc->nr_to_write > 0 && | |
3209 | wbc->range_start == 0 && wbc->range_end == LLONG_MAX)) | |
3210 | page->mapping->writeback_index = page->index + nr_written; | |
3211 | } | |
3212 | ||
d1310b2e | 3213 | /* |
40f76580 CM |
3214 | * helper for __extent_writepage, doing all of the delayed allocation setup. |
3215 | * | |
3216 | * This returns 1 if our fill_delalloc function did all the work required | |
3217 | * to write the page (copy into inline extent). In this case the IO has | |
3218 | * been started and the page is already unlocked. | |
3219 | * | |
3220 | * This returns 0 if all went well (page still locked) | |
3221 | * This returns < 0 if there were errors (page still locked) | |
d1310b2e | 3222 | */ |
40f76580 CM |
3223 | static noinline_for_stack int writepage_delalloc(struct inode *inode, |
3224 | struct page *page, struct writeback_control *wbc, | |
3225 | struct extent_page_data *epd, | |
3226 | u64 delalloc_start, | |
3227 | unsigned long *nr_written) | |
3228 | { | |
3229 | struct extent_io_tree *tree = epd->tree; | |
3230 | u64 page_end = delalloc_start + PAGE_CACHE_SIZE - 1; | |
3231 | u64 nr_delalloc; | |
3232 | u64 delalloc_to_write = 0; | |
3233 | u64 delalloc_end = 0; | |
3234 | int ret; | |
3235 | int page_started = 0; | |
3236 | ||
3237 | if (epd->extent_locked || !tree->ops || !tree->ops->fill_delalloc) | |
3238 | return 0; | |
3239 | ||
3240 | while (delalloc_end < page_end) { | |
3241 | nr_delalloc = find_lock_delalloc_range(inode, tree, | |
3242 | page, | |
3243 | &delalloc_start, | |
3244 | &delalloc_end, | |
dcab6a3b | 3245 | BTRFS_MAX_EXTENT_SIZE); |
40f76580 CM |
3246 | if (nr_delalloc == 0) { |
3247 | delalloc_start = delalloc_end + 1; | |
3248 | continue; | |
3249 | } | |
3250 | ret = tree->ops->fill_delalloc(inode, page, | |
3251 | delalloc_start, | |
3252 | delalloc_end, | |
3253 | &page_started, | |
3254 | nr_written); | |
3255 | /* File system has been set read-only */ | |
3256 | if (ret) { | |
3257 | SetPageError(page); | |
3258 | /* fill_delalloc should be return < 0 for error | |
3259 | * but just in case, we use > 0 here meaning the | |
3260 | * IO is started, so we don't want to return > 0 | |
3261 | * unless things are going well. | |
3262 | */ | |
3263 | ret = ret < 0 ? ret : -EIO; | |
3264 | goto done; | |
3265 | } | |
3266 | /* | |
3267 | * delalloc_end is already one less than the total | |
3268 | * length, so we don't subtract one from | |
3269 | * PAGE_CACHE_SIZE | |
3270 | */ | |
3271 | delalloc_to_write += (delalloc_end - delalloc_start + | |
3272 | PAGE_CACHE_SIZE) >> | |
3273 | PAGE_CACHE_SHIFT; | |
3274 | delalloc_start = delalloc_end + 1; | |
3275 | } | |
3276 | if (wbc->nr_to_write < delalloc_to_write) { | |
3277 | int thresh = 8192; | |
3278 | ||
3279 | if (delalloc_to_write < thresh * 2) | |
3280 | thresh = delalloc_to_write; | |
3281 | wbc->nr_to_write = min_t(u64, delalloc_to_write, | |
3282 | thresh); | |
3283 | } | |
3284 | ||
3285 | /* did the fill delalloc function already unlock and start | |
3286 | * the IO? | |
3287 | */ | |
3288 | if (page_started) { | |
3289 | /* | |
3290 | * we've unlocked the page, so we can't update | |
3291 | * the mapping's writeback index, just update | |
3292 | * nr_to_write. | |
3293 | */ | |
3294 | wbc->nr_to_write -= *nr_written; | |
3295 | return 1; | |
3296 | } | |
3297 | ||
3298 | ret = 0; | |
3299 | ||
3300 | done: | |
3301 | return ret; | |
3302 | } | |
3303 | ||
3304 | /* | |
3305 | * helper for __extent_writepage. This calls the writepage start hooks, | |
3306 | * and does the loop to map the page into extents and bios. | |
3307 | * | |
3308 | * We return 1 if the IO is started and the page is unlocked, | |
3309 | * 0 if all went well (page still locked) | |
3310 | * < 0 if there were errors (page still locked) | |
3311 | */ | |
3312 | static noinline_for_stack int __extent_writepage_io(struct inode *inode, | |
3313 | struct page *page, | |
3314 | struct writeback_control *wbc, | |
3315 | struct extent_page_data *epd, | |
3316 | loff_t i_size, | |
3317 | unsigned long nr_written, | |
3318 | int write_flags, int *nr_ret) | |
d1310b2e | 3319 | { |
d1310b2e | 3320 | struct extent_io_tree *tree = epd->tree; |
4eee4fa4 | 3321 | u64 start = page_offset(page); |
d1310b2e CM |
3322 | u64 page_end = start + PAGE_CACHE_SIZE - 1; |
3323 | u64 end; | |
3324 | u64 cur = start; | |
3325 | u64 extent_offset; | |
d1310b2e CM |
3326 | u64 block_start; |
3327 | u64 iosize; | |
3328 | sector_t sector; | |
2c64c53d | 3329 | struct extent_state *cached_state = NULL; |
d1310b2e CM |
3330 | struct extent_map *em; |
3331 | struct block_device *bdev; | |
7f3c74fb | 3332 | size_t pg_offset = 0; |
d1310b2e | 3333 | size_t blocksize; |
40f76580 CM |
3334 | int ret = 0; |
3335 | int nr = 0; | |
3336 | bool compressed; | |
c8b97818 | 3337 | |
247e743c | 3338 | if (tree->ops && tree->ops->writepage_start_hook) { |
c8b97818 CM |
3339 | ret = tree->ops->writepage_start_hook(page, start, |
3340 | page_end); | |
87826df0 JM |
3341 | if (ret) { |
3342 | /* Fixup worker will requeue */ | |
3343 | if (ret == -EBUSY) | |
3344 | wbc->pages_skipped++; | |
3345 | else | |
3346 | redirty_page_for_writepage(wbc, page); | |
40f76580 | 3347 | |
11c8349b | 3348 | update_nr_written(page, wbc, nr_written); |
247e743c | 3349 | unlock_page(page); |
40f76580 | 3350 | ret = 1; |
11c8349b | 3351 | goto done_unlocked; |
247e743c CM |
3352 | } |
3353 | } | |
3354 | ||
11c8349b CM |
3355 | /* |
3356 | * we don't want to touch the inode after unlocking the page, | |
3357 | * so we update the mapping writeback index now | |
3358 | */ | |
3359 | update_nr_written(page, wbc, nr_written + 1); | |
771ed689 | 3360 | |
d1310b2e | 3361 | end = page_end; |
40f76580 | 3362 | if (i_size <= start) { |
e6dcd2dc CM |
3363 | if (tree->ops && tree->ops->writepage_end_io_hook) |
3364 | tree->ops->writepage_end_io_hook(page, start, | |
3365 | page_end, NULL, 1); | |
d1310b2e CM |
3366 | goto done; |
3367 | } | |
3368 | ||
d1310b2e CM |
3369 | blocksize = inode->i_sb->s_blocksize; |
3370 | ||
3371 | while (cur <= end) { | |
40f76580 CM |
3372 | u64 em_end; |
3373 | if (cur >= i_size) { | |
e6dcd2dc CM |
3374 | if (tree->ops && tree->ops->writepage_end_io_hook) |
3375 | tree->ops->writepage_end_io_hook(page, cur, | |
3376 | page_end, NULL, 1); | |
d1310b2e CM |
3377 | break; |
3378 | } | |
7f3c74fb | 3379 | em = epd->get_extent(inode, page, pg_offset, cur, |
d1310b2e | 3380 | end - cur + 1, 1); |
c704005d | 3381 | if (IS_ERR_OR_NULL(em)) { |
d1310b2e | 3382 | SetPageError(page); |
61391d56 | 3383 | ret = PTR_ERR_OR_ZERO(em); |
d1310b2e CM |
3384 | break; |
3385 | } | |
3386 | ||
3387 | extent_offset = cur - em->start; | |
40f76580 CM |
3388 | em_end = extent_map_end(em); |
3389 | BUG_ON(em_end <= cur); | |
d1310b2e | 3390 | BUG_ON(end < cur); |
40f76580 | 3391 | iosize = min(em_end - cur, end - cur + 1); |
fda2832f | 3392 | iosize = ALIGN(iosize, blocksize); |
d1310b2e CM |
3393 | sector = (em->block_start + extent_offset) >> 9; |
3394 | bdev = em->bdev; | |
3395 | block_start = em->block_start; | |
c8b97818 | 3396 | compressed = test_bit(EXTENT_FLAG_COMPRESSED, &em->flags); |
d1310b2e CM |
3397 | free_extent_map(em); |
3398 | em = NULL; | |
3399 | ||
c8b97818 CM |
3400 | /* |
3401 | * compressed and inline extents are written through other | |
3402 | * paths in the FS | |
3403 | */ | |
3404 | if (compressed || block_start == EXTENT_MAP_HOLE || | |
d1310b2e | 3405 | block_start == EXTENT_MAP_INLINE) { |
c8b97818 CM |
3406 | /* |
3407 | * end_io notification does not happen here for | |
3408 | * compressed extents | |
3409 | */ | |
3410 | if (!compressed && tree->ops && | |
3411 | tree->ops->writepage_end_io_hook) | |
e6dcd2dc CM |
3412 | tree->ops->writepage_end_io_hook(page, cur, |
3413 | cur + iosize - 1, | |
3414 | NULL, 1); | |
c8b97818 CM |
3415 | else if (compressed) { |
3416 | /* we don't want to end_page_writeback on | |
3417 | * a compressed extent. this happens | |
3418 | * elsewhere | |
3419 | */ | |
3420 | nr++; | |
3421 | } | |
3422 | ||
3423 | cur += iosize; | |
7f3c74fb | 3424 | pg_offset += iosize; |
d1310b2e CM |
3425 | continue; |
3426 | } | |
c8b97818 | 3427 | |
d1310b2e CM |
3428 | if (tree->ops && tree->ops->writepage_io_hook) { |
3429 | ret = tree->ops->writepage_io_hook(page, cur, | |
3430 | cur + iosize - 1); | |
3431 | } else { | |
3432 | ret = 0; | |
3433 | } | |
1259ab75 | 3434 | if (ret) { |
d1310b2e | 3435 | SetPageError(page); |
1259ab75 | 3436 | } else { |
40f76580 | 3437 | unsigned long max_nr = (i_size >> PAGE_CACHE_SHIFT) + 1; |
7f3c74fb | 3438 | |
d1310b2e CM |
3439 | set_range_writeback(tree, cur, cur + iosize - 1); |
3440 | if (!PageWriteback(page)) { | |
efe120a0 FH |
3441 | btrfs_err(BTRFS_I(inode)->root->fs_info, |
3442 | "page %lu not writeback, cur %llu end %llu", | |
c1c9ff7c | 3443 | page->index, cur, end); |
d1310b2e CM |
3444 | } |
3445 | ||
ffbd517d CM |
3446 | ret = submit_extent_page(write_flags, tree, page, |
3447 | sector, iosize, pg_offset, | |
3448 | bdev, &epd->bio, max_nr, | |
c8b97818 CM |
3449 | end_bio_extent_writepage, |
3450 | 0, 0, 0); | |
d1310b2e CM |
3451 | if (ret) |
3452 | SetPageError(page); | |
3453 | } | |
3454 | cur = cur + iosize; | |
7f3c74fb | 3455 | pg_offset += iosize; |
d1310b2e CM |
3456 | nr++; |
3457 | } | |
40f76580 CM |
3458 | done: |
3459 | *nr_ret = nr; | |
3460 | ||
3461 | done_unlocked: | |
3462 | ||
3463 | /* drop our reference on any cached states */ | |
3464 | free_extent_state(cached_state); | |
3465 | return ret; | |
3466 | } | |
3467 | ||
3468 | /* | |
3469 | * the writepage semantics are similar to regular writepage. extent | |
3470 | * records are inserted to lock ranges in the tree, and as dirty areas | |
3471 | * are found, they are marked writeback. Then the lock bits are removed | |
3472 | * and the end_io handler clears the writeback ranges | |
3473 | */ | |
3474 | static int __extent_writepage(struct page *page, struct writeback_control *wbc, | |
3475 | void *data) | |
3476 | { | |
3477 | struct inode *inode = page->mapping->host; | |
3478 | struct extent_page_data *epd = data; | |
3479 | u64 start = page_offset(page); | |
3480 | u64 page_end = start + PAGE_CACHE_SIZE - 1; | |
3481 | int ret; | |
3482 | int nr = 0; | |
3483 | size_t pg_offset = 0; | |
3484 | loff_t i_size = i_size_read(inode); | |
3485 | unsigned long end_index = i_size >> PAGE_CACHE_SHIFT; | |
3486 | int write_flags; | |
3487 | unsigned long nr_written = 0; | |
3488 | ||
3489 | if (wbc->sync_mode == WB_SYNC_ALL) | |
3490 | write_flags = WRITE_SYNC; | |
3491 | else | |
3492 | write_flags = WRITE; | |
3493 | ||
3494 | trace___extent_writepage(page, inode, wbc); | |
3495 | ||
3496 | WARN_ON(!PageLocked(page)); | |
3497 | ||
3498 | ClearPageError(page); | |
3499 | ||
3500 | pg_offset = i_size & (PAGE_CACHE_SIZE - 1); | |
3501 | if (page->index > end_index || | |
3502 | (page->index == end_index && !pg_offset)) { | |
3503 | page->mapping->a_ops->invalidatepage(page, 0, PAGE_CACHE_SIZE); | |
3504 | unlock_page(page); | |
3505 | return 0; | |
3506 | } | |
3507 | ||
3508 | if (page->index == end_index) { | |
3509 | char *userpage; | |
3510 | ||
3511 | userpage = kmap_atomic(page); | |
3512 | memset(userpage + pg_offset, 0, | |
3513 | PAGE_CACHE_SIZE - pg_offset); | |
3514 | kunmap_atomic(userpage); | |
3515 | flush_dcache_page(page); | |
3516 | } | |
3517 | ||
3518 | pg_offset = 0; | |
3519 | ||
3520 | set_page_extent_mapped(page); | |
3521 | ||
3522 | ret = writepage_delalloc(inode, page, wbc, epd, start, &nr_written); | |
3523 | if (ret == 1) | |
3524 | goto done_unlocked; | |
3525 | if (ret) | |
3526 | goto done; | |
3527 | ||
3528 | ret = __extent_writepage_io(inode, page, wbc, epd, | |
3529 | i_size, nr_written, write_flags, &nr); | |
3530 | if (ret == 1) | |
3531 | goto done_unlocked; | |
3532 | ||
d1310b2e CM |
3533 | done: |
3534 | if (nr == 0) { | |
3535 | /* make sure the mapping tag for page dirty gets cleared */ | |
3536 | set_page_writeback(page); | |
3537 | end_page_writeback(page); | |
3538 | } | |
61391d56 FM |
3539 | if (PageError(page)) { |
3540 | ret = ret < 0 ? ret : -EIO; | |
3541 | end_extent_writepage(page, ret, start, page_end); | |
3542 | } | |
d1310b2e | 3543 | unlock_page(page); |
40f76580 | 3544 | return ret; |
771ed689 | 3545 | |
11c8349b | 3546 | done_unlocked: |
d1310b2e CM |
3547 | return 0; |
3548 | } | |
3549 | ||
fd8b2b61 | 3550 | void wait_on_extent_buffer_writeback(struct extent_buffer *eb) |
0b32f4bb | 3551 | { |
74316201 N |
3552 | wait_on_bit_io(&eb->bflags, EXTENT_BUFFER_WRITEBACK, |
3553 | TASK_UNINTERRUPTIBLE); | |
0b32f4bb JB |
3554 | } |
3555 | ||
0e378df1 CM |
3556 | static noinline_for_stack int |
3557 | lock_extent_buffer_for_io(struct extent_buffer *eb, | |
3558 | struct btrfs_fs_info *fs_info, | |
3559 | struct extent_page_data *epd) | |
0b32f4bb JB |
3560 | { |
3561 | unsigned long i, num_pages; | |
3562 | int flush = 0; | |
3563 | int ret = 0; | |
3564 | ||
3565 | if (!btrfs_try_tree_write_lock(eb)) { | |
3566 | flush = 1; | |
3567 | flush_write_bio(epd); | |
3568 | btrfs_tree_lock(eb); | |
3569 | } | |
3570 | ||
3571 | if (test_bit(EXTENT_BUFFER_WRITEBACK, &eb->bflags)) { | |
3572 | btrfs_tree_unlock(eb); | |
3573 | if (!epd->sync_io) | |
3574 | return 0; | |
3575 | if (!flush) { | |
3576 | flush_write_bio(epd); | |
3577 | flush = 1; | |
3578 | } | |
a098d8e8 CM |
3579 | while (1) { |
3580 | wait_on_extent_buffer_writeback(eb); | |
3581 | btrfs_tree_lock(eb); | |
3582 | if (!test_bit(EXTENT_BUFFER_WRITEBACK, &eb->bflags)) | |
3583 | break; | |
0b32f4bb | 3584 | btrfs_tree_unlock(eb); |
0b32f4bb JB |
3585 | } |
3586 | } | |
3587 | ||
51561ffe JB |
3588 | /* |
3589 | * We need to do this to prevent races in people who check if the eb is | |
3590 | * under IO since we can end up having no IO bits set for a short period | |
3591 | * of time. | |
3592 | */ | |
3593 | spin_lock(&eb->refs_lock); | |
0b32f4bb JB |
3594 | if (test_and_clear_bit(EXTENT_BUFFER_DIRTY, &eb->bflags)) { |
3595 | set_bit(EXTENT_BUFFER_WRITEBACK, &eb->bflags); | |
51561ffe | 3596 | spin_unlock(&eb->refs_lock); |
0b32f4bb | 3597 | btrfs_set_header_flag(eb, BTRFS_HEADER_FLAG_WRITTEN); |
e2d84521 MX |
3598 | __percpu_counter_add(&fs_info->dirty_metadata_bytes, |
3599 | -eb->len, | |
3600 | fs_info->dirty_metadata_batch); | |
0b32f4bb | 3601 | ret = 1; |
51561ffe JB |
3602 | } else { |
3603 | spin_unlock(&eb->refs_lock); | |
0b32f4bb JB |
3604 | } |
3605 | ||
3606 | btrfs_tree_unlock(eb); | |
3607 | ||
3608 | if (!ret) | |
3609 | return ret; | |
3610 | ||
3611 | num_pages = num_extent_pages(eb->start, eb->len); | |
3612 | for (i = 0; i < num_pages; i++) { | |
fb85fc9a | 3613 | struct page *p = eb->pages[i]; |
0b32f4bb JB |
3614 | |
3615 | if (!trylock_page(p)) { | |
3616 | if (!flush) { | |
3617 | flush_write_bio(epd); | |
3618 | flush = 1; | |
3619 | } | |
3620 | lock_page(p); | |
3621 | } | |
3622 | } | |
3623 | ||
3624 | return ret; | |
3625 | } | |
3626 | ||
3627 | static void end_extent_buffer_writeback(struct extent_buffer *eb) | |
3628 | { | |
3629 | clear_bit(EXTENT_BUFFER_WRITEBACK, &eb->bflags); | |
4e857c58 | 3630 | smp_mb__after_atomic(); |
0b32f4bb JB |
3631 | wake_up_bit(&eb->bflags, EXTENT_BUFFER_WRITEBACK); |
3632 | } | |
3633 | ||
656f30db FM |
3634 | static void set_btree_ioerr(struct page *page) |
3635 | { | |
3636 | struct extent_buffer *eb = (struct extent_buffer *)page->private; | |
3637 | struct btrfs_inode *btree_ino = BTRFS_I(eb->fs_info->btree_inode); | |
3638 | ||
3639 | SetPageError(page); | |
3640 | if (test_and_set_bit(EXTENT_BUFFER_WRITE_ERR, &eb->bflags)) | |
3641 | return; | |
3642 | ||
3643 | /* | |
3644 | * If writeback for a btree extent that doesn't belong to a log tree | |
3645 | * failed, increment the counter transaction->eb_write_errors. | |
3646 | * We do this because while the transaction is running and before it's | |
3647 | * committing (when we call filemap_fdata[write|wait]_range against | |
3648 | * the btree inode), we might have | |
3649 | * btree_inode->i_mapping->a_ops->writepages() called by the VM - if it | |
3650 | * returns an error or an error happens during writeback, when we're | |
3651 | * committing the transaction we wouldn't know about it, since the pages | |
3652 | * can be no longer dirty nor marked anymore for writeback (if a | |
3653 | * subsequent modification to the extent buffer didn't happen before the | |
3654 | * transaction commit), which makes filemap_fdata[write|wait]_range not | |
3655 | * able to find the pages tagged with SetPageError at transaction | |
3656 | * commit time. So if this happens we must abort the transaction, | |
3657 | * otherwise we commit a super block with btree roots that point to | |
3658 | * btree nodes/leafs whose content on disk is invalid - either garbage | |
3659 | * or the content of some node/leaf from a past generation that got | |
3660 | * cowed or deleted and is no longer valid. | |
3661 | * | |
3662 | * Note: setting AS_EIO/AS_ENOSPC in the btree inode's i_mapping would | |
3663 | * not be enough - we need to distinguish between log tree extents vs | |
3664 | * non-log tree extents, and the next filemap_fdatawait_range() call | |
3665 | * will catch and clear such errors in the mapping - and that call might | |
3666 | * be from a log sync and not from a transaction commit. Also, checking | |
3667 | * for the eb flag EXTENT_BUFFER_WRITE_ERR at transaction commit time is | |
3668 | * not done and would not be reliable - the eb might have been released | |
3669 | * from memory and reading it back again means that flag would not be | |
3670 | * set (since it's a runtime flag, not persisted on disk). | |
3671 | * | |
3672 | * Using the flags below in the btree inode also makes us achieve the | |
3673 | * goal of AS_EIO/AS_ENOSPC when writepages() returns success, started | |
3674 | * writeback for all dirty pages and before filemap_fdatawait_range() | |
3675 | * is called, the writeback for all dirty pages had already finished | |
3676 | * with errors - because we were not using AS_EIO/AS_ENOSPC, | |
3677 | * filemap_fdatawait_range() would return success, as it could not know | |
3678 | * that writeback errors happened (the pages were no longer tagged for | |
3679 | * writeback). | |
3680 | */ | |
3681 | switch (eb->log_index) { | |
3682 | case -1: | |
3683 | set_bit(BTRFS_INODE_BTREE_ERR, &btree_ino->runtime_flags); | |
3684 | break; | |
3685 | case 0: | |
3686 | set_bit(BTRFS_INODE_BTREE_LOG1_ERR, &btree_ino->runtime_flags); | |
3687 | break; | |
3688 | case 1: | |
3689 | set_bit(BTRFS_INODE_BTREE_LOG2_ERR, &btree_ino->runtime_flags); | |
3690 | break; | |
3691 | default: | |
3692 | BUG(); /* unexpected, logic error */ | |
3693 | } | |
3694 | } | |
3695 | ||
0b32f4bb JB |
3696 | static void end_bio_extent_buffer_writepage(struct bio *bio, int err) |
3697 | { | |
2c30c71b | 3698 | struct bio_vec *bvec; |
0b32f4bb | 3699 | struct extent_buffer *eb; |
2c30c71b | 3700 | int i, done; |
0b32f4bb | 3701 | |
2c30c71b | 3702 | bio_for_each_segment_all(bvec, bio, i) { |
0b32f4bb JB |
3703 | struct page *page = bvec->bv_page; |
3704 | ||
0b32f4bb JB |
3705 | eb = (struct extent_buffer *)page->private; |
3706 | BUG_ON(!eb); | |
3707 | done = atomic_dec_and_test(&eb->io_pages); | |
3708 | ||
656f30db | 3709 | if (err || test_bit(EXTENT_BUFFER_WRITE_ERR, &eb->bflags)) { |
0b32f4bb | 3710 | ClearPageUptodate(page); |
656f30db | 3711 | set_btree_ioerr(page); |
0b32f4bb JB |
3712 | } |
3713 | ||
3714 | end_page_writeback(page); | |
3715 | ||
3716 | if (!done) | |
3717 | continue; | |
3718 | ||
3719 | end_extent_buffer_writeback(eb); | |
2c30c71b | 3720 | } |
0b32f4bb JB |
3721 | |
3722 | bio_put(bio); | |
0b32f4bb JB |
3723 | } |
3724 | ||
0e378df1 | 3725 | static noinline_for_stack int write_one_eb(struct extent_buffer *eb, |
0b32f4bb JB |
3726 | struct btrfs_fs_info *fs_info, |
3727 | struct writeback_control *wbc, | |
3728 | struct extent_page_data *epd) | |
3729 | { | |
3730 | struct block_device *bdev = fs_info->fs_devices->latest_bdev; | |
f28491e0 | 3731 | struct extent_io_tree *tree = &BTRFS_I(fs_info->btree_inode)->io_tree; |
0b32f4bb JB |
3732 | u64 offset = eb->start; |
3733 | unsigned long i, num_pages; | |
de0022b9 | 3734 | unsigned long bio_flags = 0; |
d4c7ca86 | 3735 | int rw = (epd->sync_io ? WRITE_SYNC : WRITE) | REQ_META; |
d7dbe9e7 | 3736 | int ret = 0; |
0b32f4bb | 3737 | |
656f30db | 3738 | clear_bit(EXTENT_BUFFER_WRITE_ERR, &eb->bflags); |
0b32f4bb JB |
3739 | num_pages = num_extent_pages(eb->start, eb->len); |
3740 | atomic_set(&eb->io_pages, num_pages); | |
de0022b9 JB |
3741 | if (btrfs_header_owner(eb) == BTRFS_TREE_LOG_OBJECTID) |
3742 | bio_flags = EXTENT_BIO_TREE_LOG; | |
3743 | ||
0b32f4bb | 3744 | for (i = 0; i < num_pages; i++) { |
fb85fc9a | 3745 | struct page *p = eb->pages[i]; |
0b32f4bb JB |
3746 | |
3747 | clear_page_dirty_for_io(p); | |
3748 | set_page_writeback(p); | |
f28491e0 | 3749 | ret = submit_extent_page(rw, tree, p, offset >> 9, |
0b32f4bb JB |
3750 | PAGE_CACHE_SIZE, 0, bdev, &epd->bio, |
3751 | -1, end_bio_extent_buffer_writepage, | |
de0022b9 JB |
3752 | 0, epd->bio_flags, bio_flags); |
3753 | epd->bio_flags = bio_flags; | |
0b32f4bb | 3754 | if (ret) { |
656f30db | 3755 | set_btree_ioerr(p); |
55e3bd2e | 3756 | end_page_writeback(p); |
0b32f4bb JB |
3757 | if (atomic_sub_and_test(num_pages - i, &eb->io_pages)) |
3758 | end_extent_buffer_writeback(eb); | |
3759 | ret = -EIO; | |
3760 | break; | |
3761 | } | |
3762 | offset += PAGE_CACHE_SIZE; | |
3763 | update_nr_written(p, wbc, 1); | |
3764 | unlock_page(p); | |
3765 | } | |
3766 | ||
3767 | if (unlikely(ret)) { | |
3768 | for (; i < num_pages; i++) { | |
bbf65cf0 | 3769 | struct page *p = eb->pages[i]; |
81465028 | 3770 | clear_page_dirty_for_io(p); |
0b32f4bb JB |
3771 | unlock_page(p); |
3772 | } | |
3773 | } | |
3774 | ||
3775 | return ret; | |
3776 | } | |
3777 | ||
3778 | int btree_write_cache_pages(struct address_space *mapping, | |
3779 | struct writeback_control *wbc) | |
3780 | { | |
3781 | struct extent_io_tree *tree = &BTRFS_I(mapping->host)->io_tree; | |
3782 | struct btrfs_fs_info *fs_info = BTRFS_I(mapping->host)->root->fs_info; | |
3783 | struct extent_buffer *eb, *prev_eb = NULL; | |
3784 | struct extent_page_data epd = { | |
3785 | .bio = NULL, | |
3786 | .tree = tree, | |
3787 | .extent_locked = 0, | |
3788 | .sync_io = wbc->sync_mode == WB_SYNC_ALL, | |
de0022b9 | 3789 | .bio_flags = 0, |
0b32f4bb JB |
3790 | }; |
3791 | int ret = 0; | |
3792 | int done = 0; | |
3793 | int nr_to_write_done = 0; | |
3794 | struct pagevec pvec; | |
3795 | int nr_pages; | |
3796 | pgoff_t index; | |
3797 | pgoff_t end; /* Inclusive */ | |
3798 | int scanned = 0; | |
3799 | int tag; | |
3800 | ||
3801 | pagevec_init(&pvec, 0); | |
3802 | if (wbc->range_cyclic) { | |
3803 | index = mapping->writeback_index; /* Start from prev offset */ | |
3804 | end = -1; | |
3805 | } else { | |
3806 | index = wbc->range_start >> PAGE_CACHE_SHIFT; | |
3807 | end = wbc->range_end >> PAGE_CACHE_SHIFT; | |
3808 | scanned = 1; | |
3809 | } | |
3810 | if (wbc->sync_mode == WB_SYNC_ALL) | |
3811 | tag = PAGECACHE_TAG_TOWRITE; | |
3812 | else | |
3813 | tag = PAGECACHE_TAG_DIRTY; | |
3814 | retry: | |
3815 | if (wbc->sync_mode == WB_SYNC_ALL) | |
3816 | tag_pages_for_writeback(mapping, index, end); | |
3817 | while (!done && !nr_to_write_done && (index <= end) && | |
3818 | (nr_pages = pagevec_lookup_tag(&pvec, mapping, &index, tag, | |
3819 | min(end - index, (pgoff_t)PAGEVEC_SIZE-1) + 1))) { | |
3820 | unsigned i; | |
3821 | ||
3822 | scanned = 1; | |
3823 | for (i = 0; i < nr_pages; i++) { | |
3824 | struct page *page = pvec.pages[i]; | |
3825 | ||
3826 | if (!PagePrivate(page)) | |
3827 | continue; | |
3828 | ||
3829 | if (!wbc->range_cyclic && page->index > end) { | |
3830 | done = 1; | |
3831 | break; | |
3832 | } | |
3833 | ||
b5bae261 JB |
3834 | spin_lock(&mapping->private_lock); |
3835 | if (!PagePrivate(page)) { | |
3836 | spin_unlock(&mapping->private_lock); | |
3837 | continue; | |
3838 | } | |
3839 | ||
0b32f4bb | 3840 | eb = (struct extent_buffer *)page->private; |
b5bae261 JB |
3841 | |
3842 | /* | |
3843 | * Shouldn't happen and normally this would be a BUG_ON | |
3844 | * but no sense in crashing the users box for something | |
3845 | * we can survive anyway. | |
3846 | */ | |
fae7f21c | 3847 | if (WARN_ON(!eb)) { |
b5bae261 | 3848 | spin_unlock(&mapping->private_lock); |
0b32f4bb JB |
3849 | continue; |
3850 | } | |
3851 | ||
b5bae261 JB |
3852 | if (eb == prev_eb) { |
3853 | spin_unlock(&mapping->private_lock); | |
0b32f4bb | 3854 | continue; |
b5bae261 | 3855 | } |
0b32f4bb | 3856 | |
b5bae261 JB |
3857 | ret = atomic_inc_not_zero(&eb->refs); |
3858 | spin_unlock(&mapping->private_lock); | |
3859 | if (!ret) | |
0b32f4bb | 3860 | continue; |
0b32f4bb JB |
3861 | |
3862 | prev_eb = eb; | |
3863 | ret = lock_extent_buffer_for_io(eb, fs_info, &epd); | |
3864 | if (!ret) { | |
3865 | free_extent_buffer(eb); | |
3866 | continue; | |
3867 | } | |
3868 | ||
3869 | ret = write_one_eb(eb, fs_info, wbc, &epd); | |
3870 | if (ret) { | |
3871 | done = 1; | |
3872 | free_extent_buffer(eb); | |
3873 | break; | |
3874 | } | |
3875 | free_extent_buffer(eb); | |
3876 | ||
3877 | /* | |
3878 | * the filesystem may choose to bump up nr_to_write. | |
3879 | * We have to make sure to honor the new nr_to_write | |
3880 | * at any time | |
3881 | */ | |
3882 | nr_to_write_done = wbc->nr_to_write <= 0; | |
3883 | } | |
3884 | pagevec_release(&pvec); | |
3885 | cond_resched(); | |
3886 | } | |
3887 | if (!scanned && !done) { | |
3888 | /* | |
3889 | * We hit the last page and there is more work to be done: wrap | |
3890 | * back to the start of the file | |
3891 | */ | |
3892 | scanned = 1; | |
3893 | index = 0; | |
3894 | goto retry; | |
3895 | } | |
3896 | flush_write_bio(&epd); | |
3897 | return ret; | |
3898 | } | |
3899 | ||
d1310b2e | 3900 | /** |
4bef0848 | 3901 | * write_cache_pages - walk the list of dirty pages of the given address space and write all of them. |
d1310b2e CM |
3902 | * @mapping: address space structure to write |
3903 | * @wbc: subtract the number of written pages from *@wbc->nr_to_write | |
3904 | * @writepage: function called for each page | |
3905 | * @data: data passed to writepage function | |
3906 | * | |
3907 | * If a page is already under I/O, write_cache_pages() skips it, even | |
3908 | * if it's dirty. This is desirable behaviour for memory-cleaning writeback, | |
3909 | * but it is INCORRECT for data-integrity system calls such as fsync(). fsync() | |
3910 | * and msync() need to guarantee that all the data which was dirty at the time | |
3911 | * the call was made get new I/O started against them. If wbc->sync_mode is | |
3912 | * WB_SYNC_ALL then we were called for data integrity and we must wait for | |
3913 | * existing IO to complete. | |
3914 | */ | |
b2950863 | 3915 | static int extent_write_cache_pages(struct extent_io_tree *tree, |
4bef0848 CM |
3916 | struct address_space *mapping, |
3917 | struct writeback_control *wbc, | |
d2c3f4f6 CM |
3918 | writepage_t writepage, void *data, |
3919 | void (*flush_fn)(void *)) | |
d1310b2e | 3920 | { |
7fd1a3f7 | 3921 | struct inode *inode = mapping->host; |
d1310b2e CM |
3922 | int ret = 0; |
3923 | int done = 0; | |
61391d56 | 3924 | int err = 0; |
f85d7d6c | 3925 | int nr_to_write_done = 0; |
d1310b2e CM |
3926 | struct pagevec pvec; |
3927 | int nr_pages; | |
3928 | pgoff_t index; | |
3929 | pgoff_t end; /* Inclusive */ | |
3930 | int scanned = 0; | |
f7aaa06b | 3931 | int tag; |
d1310b2e | 3932 | |
7fd1a3f7 JB |
3933 | /* |
3934 | * We have to hold onto the inode so that ordered extents can do their | |
3935 | * work when the IO finishes. The alternative to this is failing to add | |
3936 | * an ordered extent if the igrab() fails there and that is a huge pain | |
3937 | * to deal with, so instead just hold onto the inode throughout the | |
3938 | * writepages operation. If it fails here we are freeing up the inode | |
3939 | * anyway and we'd rather not waste our time writing out stuff that is | |
3940 | * going to be truncated anyway. | |
3941 | */ | |
3942 | if (!igrab(inode)) | |
3943 | return 0; | |
3944 | ||
d1310b2e CM |
3945 | pagevec_init(&pvec, 0); |
3946 | if (wbc->range_cyclic) { | |
3947 | index = mapping->writeback_index; /* Start from prev offset */ | |
3948 | end = -1; | |
3949 | } else { | |
3950 | index = wbc->range_start >> PAGE_CACHE_SHIFT; | |
3951 | end = wbc->range_end >> PAGE_CACHE_SHIFT; | |
d1310b2e CM |
3952 | scanned = 1; |
3953 | } | |
f7aaa06b JB |
3954 | if (wbc->sync_mode == WB_SYNC_ALL) |
3955 | tag = PAGECACHE_TAG_TOWRITE; | |
3956 | else | |
3957 | tag = PAGECACHE_TAG_DIRTY; | |
d1310b2e | 3958 | retry: |
f7aaa06b JB |
3959 | if (wbc->sync_mode == WB_SYNC_ALL) |
3960 | tag_pages_for_writeback(mapping, index, end); | |
f85d7d6c | 3961 | while (!done && !nr_to_write_done && (index <= end) && |
f7aaa06b JB |
3962 | (nr_pages = pagevec_lookup_tag(&pvec, mapping, &index, tag, |
3963 | min(end - index, (pgoff_t)PAGEVEC_SIZE-1) + 1))) { | |
d1310b2e CM |
3964 | unsigned i; |
3965 | ||
3966 | scanned = 1; | |
3967 | for (i = 0; i < nr_pages; i++) { | |
3968 | struct page *page = pvec.pages[i]; | |
3969 | ||
3970 | /* | |
3971 | * At this point we hold neither mapping->tree_lock nor | |
3972 | * lock on the page itself: the page may be truncated or | |
3973 | * invalidated (changing page->mapping to NULL), or even | |
3974 | * swizzled back from swapper_space to tmpfs file | |
3975 | * mapping | |
3976 | */ | |
c8f2f24b JB |
3977 | if (!trylock_page(page)) { |
3978 | flush_fn(data); | |
3979 | lock_page(page); | |
01d658f2 | 3980 | } |
d1310b2e CM |
3981 | |
3982 | if (unlikely(page->mapping != mapping)) { | |
3983 | unlock_page(page); | |
3984 | continue; | |
3985 | } | |
3986 | ||
3987 | if (!wbc->range_cyclic && page->index > end) { | |
3988 | done = 1; | |
3989 | unlock_page(page); | |
3990 | continue; | |
3991 | } | |
3992 | ||
d2c3f4f6 | 3993 | if (wbc->sync_mode != WB_SYNC_NONE) { |
0e6bd956 CM |
3994 | if (PageWriteback(page)) |
3995 | flush_fn(data); | |
d1310b2e | 3996 | wait_on_page_writeback(page); |
d2c3f4f6 | 3997 | } |
d1310b2e CM |
3998 | |
3999 | if (PageWriteback(page) || | |
4000 | !clear_page_dirty_for_io(page)) { | |
4001 | unlock_page(page); | |
4002 | continue; | |
4003 | } | |
4004 | ||
4005 | ret = (*writepage)(page, wbc, data); | |
4006 | ||
4007 | if (unlikely(ret == AOP_WRITEPAGE_ACTIVATE)) { | |
4008 | unlock_page(page); | |
4009 | ret = 0; | |
4010 | } | |
61391d56 FM |
4011 | if (!err && ret < 0) |
4012 | err = ret; | |
f85d7d6c CM |
4013 | |
4014 | /* | |
4015 | * the filesystem may choose to bump up nr_to_write. | |
4016 | * We have to make sure to honor the new nr_to_write | |
4017 | * at any time | |
4018 | */ | |
4019 | nr_to_write_done = wbc->nr_to_write <= 0; | |
d1310b2e CM |
4020 | } |
4021 | pagevec_release(&pvec); | |
4022 | cond_resched(); | |
4023 | } | |
61391d56 | 4024 | if (!scanned && !done && !err) { |
d1310b2e CM |
4025 | /* |
4026 | * We hit the last page and there is more work to be done: wrap | |
4027 | * back to the start of the file | |
4028 | */ | |
4029 | scanned = 1; | |
4030 | index = 0; | |
4031 | goto retry; | |
4032 | } | |
7fd1a3f7 | 4033 | btrfs_add_delayed_iput(inode); |
61391d56 | 4034 | return err; |
d1310b2e | 4035 | } |
d1310b2e | 4036 | |
ffbd517d | 4037 | static void flush_epd_write_bio(struct extent_page_data *epd) |
d2c3f4f6 | 4038 | { |
d2c3f4f6 | 4039 | if (epd->bio) { |
355808c2 JM |
4040 | int rw = WRITE; |
4041 | int ret; | |
4042 | ||
ffbd517d | 4043 | if (epd->sync_io) |
355808c2 JM |
4044 | rw = WRITE_SYNC; |
4045 | ||
de0022b9 | 4046 | ret = submit_one_bio(rw, epd->bio, 0, epd->bio_flags); |
79787eaa | 4047 | BUG_ON(ret < 0); /* -ENOMEM */ |
d2c3f4f6 CM |
4048 | epd->bio = NULL; |
4049 | } | |
4050 | } | |
4051 | ||
ffbd517d CM |
4052 | static noinline void flush_write_bio(void *data) |
4053 | { | |
4054 | struct extent_page_data *epd = data; | |
4055 | flush_epd_write_bio(epd); | |
4056 | } | |
4057 | ||
d1310b2e CM |
4058 | int extent_write_full_page(struct extent_io_tree *tree, struct page *page, |
4059 | get_extent_t *get_extent, | |
4060 | struct writeback_control *wbc) | |
4061 | { | |
4062 | int ret; | |
d1310b2e CM |
4063 | struct extent_page_data epd = { |
4064 | .bio = NULL, | |
4065 | .tree = tree, | |
4066 | .get_extent = get_extent, | |
771ed689 | 4067 | .extent_locked = 0, |
ffbd517d | 4068 | .sync_io = wbc->sync_mode == WB_SYNC_ALL, |
de0022b9 | 4069 | .bio_flags = 0, |
d1310b2e | 4070 | }; |
d1310b2e | 4071 | |
d1310b2e CM |
4072 | ret = __extent_writepage(page, wbc, &epd); |
4073 | ||
ffbd517d | 4074 | flush_epd_write_bio(&epd); |
d1310b2e CM |
4075 | return ret; |
4076 | } | |
d1310b2e | 4077 | |
771ed689 CM |
4078 | int extent_write_locked_range(struct extent_io_tree *tree, struct inode *inode, |
4079 | u64 start, u64 end, get_extent_t *get_extent, | |
4080 | int mode) | |
4081 | { | |
4082 | int ret = 0; | |
4083 | struct address_space *mapping = inode->i_mapping; | |
4084 | struct page *page; | |
4085 | unsigned long nr_pages = (end - start + PAGE_CACHE_SIZE) >> | |
4086 | PAGE_CACHE_SHIFT; | |
4087 | ||
4088 | struct extent_page_data epd = { | |
4089 | .bio = NULL, | |
4090 | .tree = tree, | |
4091 | .get_extent = get_extent, | |
4092 | .extent_locked = 1, | |
ffbd517d | 4093 | .sync_io = mode == WB_SYNC_ALL, |
de0022b9 | 4094 | .bio_flags = 0, |
771ed689 CM |
4095 | }; |
4096 | struct writeback_control wbc_writepages = { | |
771ed689 | 4097 | .sync_mode = mode, |
771ed689 CM |
4098 | .nr_to_write = nr_pages * 2, |
4099 | .range_start = start, | |
4100 | .range_end = end + 1, | |
4101 | }; | |
4102 | ||
d397712b | 4103 | while (start <= end) { |
771ed689 CM |
4104 | page = find_get_page(mapping, start >> PAGE_CACHE_SHIFT); |
4105 | if (clear_page_dirty_for_io(page)) | |
4106 | ret = __extent_writepage(page, &wbc_writepages, &epd); | |
4107 | else { | |
4108 | if (tree->ops && tree->ops->writepage_end_io_hook) | |
4109 | tree->ops->writepage_end_io_hook(page, start, | |
4110 | start + PAGE_CACHE_SIZE - 1, | |
4111 | NULL, 1); | |
4112 | unlock_page(page); | |
4113 | } | |
4114 | page_cache_release(page); | |
4115 | start += PAGE_CACHE_SIZE; | |
4116 | } | |
4117 | ||
ffbd517d | 4118 | flush_epd_write_bio(&epd); |
771ed689 CM |
4119 | return ret; |
4120 | } | |
d1310b2e CM |
4121 | |
4122 | int extent_writepages(struct extent_io_tree *tree, | |
4123 | struct address_space *mapping, | |
4124 | get_extent_t *get_extent, | |
4125 | struct writeback_control *wbc) | |
4126 | { | |
4127 | int ret = 0; | |
4128 | struct extent_page_data epd = { | |
4129 | .bio = NULL, | |
4130 | .tree = tree, | |
4131 | .get_extent = get_extent, | |
771ed689 | 4132 | .extent_locked = 0, |
ffbd517d | 4133 | .sync_io = wbc->sync_mode == WB_SYNC_ALL, |
de0022b9 | 4134 | .bio_flags = 0, |
d1310b2e CM |
4135 | }; |
4136 | ||
4bef0848 | 4137 | ret = extent_write_cache_pages(tree, mapping, wbc, |
d2c3f4f6 CM |
4138 | __extent_writepage, &epd, |
4139 | flush_write_bio); | |
ffbd517d | 4140 | flush_epd_write_bio(&epd); |
d1310b2e CM |
4141 | return ret; |
4142 | } | |
d1310b2e CM |
4143 | |
4144 | int extent_readpages(struct extent_io_tree *tree, | |
4145 | struct address_space *mapping, | |
4146 | struct list_head *pages, unsigned nr_pages, | |
4147 | get_extent_t get_extent) | |
4148 | { | |
4149 | struct bio *bio = NULL; | |
4150 | unsigned page_idx; | |
c8b97818 | 4151 | unsigned long bio_flags = 0; |
67c9684f LB |
4152 | struct page *pagepool[16]; |
4153 | struct page *page; | |
125bac01 | 4154 | struct extent_map *em_cached = NULL; |
67c9684f | 4155 | int nr = 0; |
d1310b2e | 4156 | |
d1310b2e | 4157 | for (page_idx = 0; page_idx < nr_pages; page_idx++) { |
67c9684f | 4158 | page = list_entry(pages->prev, struct page, lru); |
d1310b2e CM |
4159 | |
4160 | prefetchw(&page->flags); | |
4161 | list_del(&page->lru); | |
67c9684f | 4162 | if (add_to_page_cache_lru(page, mapping, |
43e817a1 | 4163 | page->index, GFP_NOFS)) { |
67c9684f LB |
4164 | page_cache_release(page); |
4165 | continue; | |
d1310b2e | 4166 | } |
67c9684f LB |
4167 | |
4168 | pagepool[nr++] = page; | |
4169 | if (nr < ARRAY_SIZE(pagepool)) | |
4170 | continue; | |
125bac01 | 4171 | __extent_readpages(tree, pagepool, nr, get_extent, &em_cached, |
9974090b | 4172 | &bio, 0, &bio_flags, READ); |
67c9684f | 4173 | nr = 0; |
d1310b2e | 4174 | } |
9974090b | 4175 | if (nr) |
125bac01 | 4176 | __extent_readpages(tree, pagepool, nr, get_extent, &em_cached, |
9974090b | 4177 | &bio, 0, &bio_flags, READ); |
67c9684f | 4178 | |
125bac01 MX |
4179 | if (em_cached) |
4180 | free_extent_map(em_cached); | |
4181 | ||
d1310b2e CM |
4182 | BUG_ON(!list_empty(pages)); |
4183 | if (bio) | |
79787eaa | 4184 | return submit_one_bio(READ, bio, 0, bio_flags); |
d1310b2e CM |
4185 | return 0; |
4186 | } | |
d1310b2e CM |
4187 | |
4188 | /* | |
4189 | * basic invalidatepage code, this waits on any locked or writeback | |
4190 | * ranges corresponding to the page, and then deletes any extent state | |
4191 | * records from the tree | |
4192 | */ | |
4193 | int extent_invalidatepage(struct extent_io_tree *tree, | |
4194 | struct page *page, unsigned long offset) | |
4195 | { | |
2ac55d41 | 4196 | struct extent_state *cached_state = NULL; |
4eee4fa4 | 4197 | u64 start = page_offset(page); |
d1310b2e CM |
4198 | u64 end = start + PAGE_CACHE_SIZE - 1; |
4199 | size_t blocksize = page->mapping->host->i_sb->s_blocksize; | |
4200 | ||
fda2832f | 4201 | start += ALIGN(offset, blocksize); |
d1310b2e CM |
4202 | if (start > end) |
4203 | return 0; | |
4204 | ||
d0082371 | 4205 | lock_extent_bits(tree, start, end, 0, &cached_state); |
1edbb734 | 4206 | wait_on_page_writeback(page); |
d1310b2e | 4207 | clear_extent_bit(tree, start, end, |
32c00aff JB |
4208 | EXTENT_LOCKED | EXTENT_DIRTY | EXTENT_DELALLOC | |
4209 | EXTENT_DO_ACCOUNTING, | |
2ac55d41 | 4210 | 1, 1, &cached_state, GFP_NOFS); |
d1310b2e CM |
4211 | return 0; |
4212 | } | |
d1310b2e | 4213 | |
7b13b7b1 CM |
4214 | /* |
4215 | * a helper for releasepage, this tests for areas of the page that | |
4216 | * are locked or under IO and drops the related state bits if it is safe | |
4217 | * to drop the page. | |
4218 | */ | |
48a3b636 ES |
4219 | static int try_release_extent_state(struct extent_map_tree *map, |
4220 | struct extent_io_tree *tree, | |
4221 | struct page *page, gfp_t mask) | |
7b13b7b1 | 4222 | { |
4eee4fa4 | 4223 | u64 start = page_offset(page); |
7b13b7b1 CM |
4224 | u64 end = start + PAGE_CACHE_SIZE - 1; |
4225 | int ret = 1; | |
4226 | ||
211f90e6 | 4227 | if (test_range_bit(tree, start, end, |
8b62b72b | 4228 | EXTENT_IOBITS, 0, NULL)) |
7b13b7b1 CM |
4229 | ret = 0; |
4230 | else { | |
4231 | if ((mask & GFP_NOFS) == GFP_NOFS) | |
4232 | mask = GFP_NOFS; | |
11ef160f CM |
4233 | /* |
4234 | * at this point we can safely clear everything except the | |
4235 | * locked bit and the nodatasum bit | |
4236 | */ | |
e3f24cc5 | 4237 | ret = clear_extent_bit(tree, start, end, |
11ef160f CM |
4238 | ~(EXTENT_LOCKED | EXTENT_NODATASUM), |
4239 | 0, 0, NULL, mask); | |
e3f24cc5 CM |
4240 | |
4241 | /* if clear_extent_bit failed for enomem reasons, | |
4242 | * we can't allow the release to continue. | |
4243 | */ | |
4244 | if (ret < 0) | |
4245 | ret = 0; | |
4246 | else | |
4247 | ret = 1; | |
7b13b7b1 CM |
4248 | } |
4249 | return ret; | |
4250 | } | |
7b13b7b1 | 4251 | |
d1310b2e CM |
4252 | /* |
4253 | * a helper for releasepage. As long as there are no locked extents | |
4254 | * in the range corresponding to the page, both state records and extent | |
4255 | * map records are removed | |
4256 | */ | |
4257 | int try_release_extent_mapping(struct extent_map_tree *map, | |
70dec807 CM |
4258 | struct extent_io_tree *tree, struct page *page, |
4259 | gfp_t mask) | |
d1310b2e CM |
4260 | { |
4261 | struct extent_map *em; | |
4eee4fa4 | 4262 | u64 start = page_offset(page); |
d1310b2e | 4263 | u64 end = start + PAGE_CACHE_SIZE - 1; |
7b13b7b1 | 4264 | |
70dec807 CM |
4265 | if ((mask & __GFP_WAIT) && |
4266 | page->mapping->host->i_size > 16 * 1024 * 1024) { | |
39b5637f | 4267 | u64 len; |
70dec807 | 4268 | while (start <= end) { |
39b5637f | 4269 | len = end - start + 1; |
890871be | 4270 | write_lock(&map->lock); |
39b5637f | 4271 | em = lookup_extent_mapping(map, start, len); |
285190d9 | 4272 | if (!em) { |
890871be | 4273 | write_unlock(&map->lock); |
70dec807 CM |
4274 | break; |
4275 | } | |
7f3c74fb CM |
4276 | if (test_bit(EXTENT_FLAG_PINNED, &em->flags) || |
4277 | em->start != start) { | |
890871be | 4278 | write_unlock(&map->lock); |
70dec807 CM |
4279 | free_extent_map(em); |
4280 | break; | |
4281 | } | |
4282 | if (!test_range_bit(tree, em->start, | |
4283 | extent_map_end(em) - 1, | |
8b62b72b | 4284 | EXTENT_LOCKED | EXTENT_WRITEBACK, |
9655d298 | 4285 | 0, NULL)) { |
70dec807 CM |
4286 | remove_extent_mapping(map, em); |
4287 | /* once for the rb tree */ | |
4288 | free_extent_map(em); | |
4289 | } | |
4290 | start = extent_map_end(em); | |
890871be | 4291 | write_unlock(&map->lock); |
70dec807 CM |
4292 | |
4293 | /* once for us */ | |
d1310b2e CM |
4294 | free_extent_map(em); |
4295 | } | |
d1310b2e | 4296 | } |
7b13b7b1 | 4297 | return try_release_extent_state(map, tree, page, mask); |
d1310b2e | 4298 | } |
d1310b2e | 4299 | |
ec29ed5b CM |
4300 | /* |
4301 | * helper function for fiemap, which doesn't want to see any holes. | |
4302 | * This maps until we find something past 'last' | |
4303 | */ | |
4304 | static struct extent_map *get_extent_skip_holes(struct inode *inode, | |
4305 | u64 offset, | |
4306 | u64 last, | |
4307 | get_extent_t *get_extent) | |
4308 | { | |
4309 | u64 sectorsize = BTRFS_I(inode)->root->sectorsize; | |
4310 | struct extent_map *em; | |
4311 | u64 len; | |
4312 | ||
4313 | if (offset >= last) | |
4314 | return NULL; | |
4315 | ||
67871254 | 4316 | while (1) { |
ec29ed5b CM |
4317 | len = last - offset; |
4318 | if (len == 0) | |
4319 | break; | |
fda2832f | 4320 | len = ALIGN(len, sectorsize); |
ec29ed5b | 4321 | em = get_extent(inode, NULL, 0, offset, len, 0); |
c704005d | 4322 | if (IS_ERR_OR_NULL(em)) |
ec29ed5b CM |
4323 | return em; |
4324 | ||
4325 | /* if this isn't a hole return it */ | |
4326 | if (!test_bit(EXTENT_FLAG_VACANCY, &em->flags) && | |
4327 | em->block_start != EXTENT_MAP_HOLE) { | |
4328 | return em; | |
4329 | } | |
4330 | ||
4331 | /* this is a hole, advance to the next extent */ | |
4332 | offset = extent_map_end(em); | |
4333 | free_extent_map(em); | |
4334 | if (offset >= last) | |
4335 | break; | |
4336 | } | |
4337 | return NULL; | |
4338 | } | |
4339 | ||
1506fcc8 YS |
4340 | int extent_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, |
4341 | __u64 start, __u64 len, get_extent_t *get_extent) | |
4342 | { | |
975f84fe | 4343 | int ret = 0; |
1506fcc8 YS |
4344 | u64 off = start; |
4345 | u64 max = start + len; | |
4346 | u32 flags = 0; | |
975f84fe JB |
4347 | u32 found_type; |
4348 | u64 last; | |
ec29ed5b | 4349 | u64 last_for_get_extent = 0; |
1506fcc8 | 4350 | u64 disko = 0; |
ec29ed5b | 4351 | u64 isize = i_size_read(inode); |
975f84fe | 4352 | struct btrfs_key found_key; |
1506fcc8 | 4353 | struct extent_map *em = NULL; |
2ac55d41 | 4354 | struct extent_state *cached_state = NULL; |
975f84fe | 4355 | struct btrfs_path *path; |
dc046b10 | 4356 | struct btrfs_root *root = BTRFS_I(inode)->root; |
1506fcc8 | 4357 | int end = 0; |
ec29ed5b CM |
4358 | u64 em_start = 0; |
4359 | u64 em_len = 0; | |
4360 | u64 em_end = 0; | |
1506fcc8 YS |
4361 | |
4362 | if (len == 0) | |
4363 | return -EINVAL; | |
4364 | ||
975f84fe JB |
4365 | path = btrfs_alloc_path(); |
4366 | if (!path) | |
4367 | return -ENOMEM; | |
4368 | path->leave_spinning = 1; | |
4369 | ||
2c91943b QW |
4370 | start = round_down(start, BTRFS_I(inode)->root->sectorsize); |
4371 | len = round_up(max, BTRFS_I(inode)->root->sectorsize) - start; | |
4d479cf0 | 4372 | |
ec29ed5b CM |
4373 | /* |
4374 | * lookup the last file extent. We're not using i_size here | |
4375 | * because there might be preallocation past i_size | |
4376 | */ | |
dc046b10 JB |
4377 | ret = btrfs_lookup_file_extent(NULL, root, path, btrfs_ino(inode), -1, |
4378 | 0); | |
975f84fe JB |
4379 | if (ret < 0) { |
4380 | btrfs_free_path(path); | |
4381 | return ret; | |
4382 | } | |
4383 | WARN_ON(!ret); | |
4384 | path->slots[0]--; | |
975f84fe | 4385 | btrfs_item_key_to_cpu(path->nodes[0], &found_key, path->slots[0]); |
962a298f | 4386 | found_type = found_key.type; |
975f84fe | 4387 | |
ec29ed5b | 4388 | /* No extents, but there might be delalloc bits */ |
33345d01 | 4389 | if (found_key.objectid != btrfs_ino(inode) || |
975f84fe | 4390 | found_type != BTRFS_EXTENT_DATA_KEY) { |
ec29ed5b CM |
4391 | /* have to trust i_size as the end */ |
4392 | last = (u64)-1; | |
4393 | last_for_get_extent = isize; | |
4394 | } else { | |
4395 | /* | |
4396 | * remember the start of the last extent. There are a | |
4397 | * bunch of different factors that go into the length of the | |
4398 | * extent, so its much less complex to remember where it started | |
4399 | */ | |
4400 | last = found_key.offset; | |
4401 | last_for_get_extent = last + 1; | |
975f84fe | 4402 | } |
fe09e16c | 4403 | btrfs_release_path(path); |
975f84fe | 4404 | |
ec29ed5b CM |
4405 | /* |
4406 | * we might have some extents allocated but more delalloc past those | |
4407 | * extents. so, we trust isize unless the start of the last extent is | |
4408 | * beyond isize | |
4409 | */ | |
4410 | if (last < isize) { | |
4411 | last = (u64)-1; | |
4412 | last_for_get_extent = isize; | |
4413 | } | |
4414 | ||
a52f4cd2 | 4415 | lock_extent_bits(&BTRFS_I(inode)->io_tree, start, start + len - 1, 0, |
d0082371 | 4416 | &cached_state); |
ec29ed5b | 4417 | |
4d479cf0 | 4418 | em = get_extent_skip_holes(inode, start, last_for_get_extent, |
ec29ed5b | 4419 | get_extent); |
1506fcc8 YS |
4420 | if (!em) |
4421 | goto out; | |
4422 | if (IS_ERR(em)) { | |
4423 | ret = PTR_ERR(em); | |
4424 | goto out; | |
4425 | } | |
975f84fe | 4426 | |
1506fcc8 | 4427 | while (!end) { |
b76bb701 | 4428 | u64 offset_in_extent = 0; |
ea8efc74 CM |
4429 | |
4430 | /* break if the extent we found is outside the range */ | |
4431 | if (em->start >= max || extent_map_end(em) < off) | |
4432 | break; | |
4433 | ||
4434 | /* | |
4435 | * get_extent may return an extent that starts before our | |
4436 | * requested range. We have to make sure the ranges | |
4437 | * we return to fiemap always move forward and don't | |
4438 | * overlap, so adjust the offsets here | |
4439 | */ | |
4440 | em_start = max(em->start, off); | |
1506fcc8 | 4441 | |
ea8efc74 CM |
4442 | /* |
4443 | * record the offset from the start of the extent | |
b76bb701 JB |
4444 | * for adjusting the disk offset below. Only do this if the |
4445 | * extent isn't compressed since our in ram offset may be past | |
4446 | * what we have actually allocated on disk. | |
ea8efc74 | 4447 | */ |
b76bb701 JB |
4448 | if (!test_bit(EXTENT_FLAG_COMPRESSED, &em->flags)) |
4449 | offset_in_extent = em_start - em->start; | |
ec29ed5b | 4450 | em_end = extent_map_end(em); |
ea8efc74 | 4451 | em_len = em_end - em_start; |
1506fcc8 YS |
4452 | disko = 0; |
4453 | flags = 0; | |
4454 | ||
ea8efc74 CM |
4455 | /* |
4456 | * bump off for our next call to get_extent | |
4457 | */ | |
4458 | off = extent_map_end(em); | |
4459 | if (off >= max) | |
4460 | end = 1; | |
4461 | ||
93dbfad7 | 4462 | if (em->block_start == EXTENT_MAP_LAST_BYTE) { |
1506fcc8 YS |
4463 | end = 1; |
4464 | flags |= FIEMAP_EXTENT_LAST; | |
93dbfad7 | 4465 | } else if (em->block_start == EXTENT_MAP_INLINE) { |
1506fcc8 YS |
4466 | flags |= (FIEMAP_EXTENT_DATA_INLINE | |
4467 | FIEMAP_EXTENT_NOT_ALIGNED); | |
93dbfad7 | 4468 | } else if (em->block_start == EXTENT_MAP_DELALLOC) { |
1506fcc8 YS |
4469 | flags |= (FIEMAP_EXTENT_DELALLOC | |
4470 | FIEMAP_EXTENT_UNKNOWN); | |
dc046b10 JB |
4471 | } else if (fieinfo->fi_extents_max) { |
4472 | u64 bytenr = em->block_start - | |
4473 | (em->start - em->orig_start); | |
fe09e16c | 4474 | |
ea8efc74 | 4475 | disko = em->block_start + offset_in_extent; |
fe09e16c LB |
4476 | |
4477 | /* | |
4478 | * As btrfs supports shared space, this information | |
4479 | * can be exported to userspace tools via | |
dc046b10 JB |
4480 | * flag FIEMAP_EXTENT_SHARED. If fi_extents_max == 0 |
4481 | * then we're just getting a count and we can skip the | |
4482 | * lookup stuff. | |
fe09e16c | 4483 | */ |
dc046b10 JB |
4484 | ret = btrfs_check_shared(NULL, root->fs_info, |
4485 | root->objectid, | |
4486 | btrfs_ino(inode), bytenr); | |
4487 | if (ret < 0) | |
fe09e16c | 4488 | goto out_free; |
dc046b10 | 4489 | if (ret) |
fe09e16c | 4490 | flags |= FIEMAP_EXTENT_SHARED; |
dc046b10 | 4491 | ret = 0; |
1506fcc8 YS |
4492 | } |
4493 | if (test_bit(EXTENT_FLAG_COMPRESSED, &em->flags)) | |
4494 | flags |= FIEMAP_EXTENT_ENCODED; | |
4495 | ||
1506fcc8 YS |
4496 | free_extent_map(em); |
4497 | em = NULL; | |
ec29ed5b CM |
4498 | if ((em_start >= last) || em_len == (u64)-1 || |
4499 | (last == (u64)-1 && isize <= em_end)) { | |
1506fcc8 YS |
4500 | flags |= FIEMAP_EXTENT_LAST; |
4501 | end = 1; | |
4502 | } | |
4503 | ||
ec29ed5b CM |
4504 | /* now scan forward to see if this is really the last extent. */ |
4505 | em = get_extent_skip_holes(inode, off, last_for_get_extent, | |
4506 | get_extent); | |
4507 | if (IS_ERR(em)) { | |
4508 | ret = PTR_ERR(em); | |
4509 | goto out; | |
4510 | } | |
4511 | if (!em) { | |
975f84fe JB |
4512 | flags |= FIEMAP_EXTENT_LAST; |
4513 | end = 1; | |
4514 | } | |
ec29ed5b CM |
4515 | ret = fiemap_fill_next_extent(fieinfo, em_start, disko, |
4516 | em_len, flags); | |
4517 | if (ret) | |
4518 | goto out_free; | |
1506fcc8 YS |
4519 | } |
4520 | out_free: | |
4521 | free_extent_map(em); | |
4522 | out: | |
fe09e16c | 4523 | btrfs_free_path(path); |
a52f4cd2 | 4524 | unlock_extent_cached(&BTRFS_I(inode)->io_tree, start, start + len - 1, |
2ac55d41 | 4525 | &cached_state, GFP_NOFS); |
1506fcc8 YS |
4526 | return ret; |
4527 | } | |
4528 | ||
727011e0 CM |
4529 | static void __free_extent_buffer(struct extent_buffer *eb) |
4530 | { | |
6d49ba1b | 4531 | btrfs_leak_debug_del(&eb->leak_list); |
727011e0 CM |
4532 | kmem_cache_free(extent_buffer_cache, eb); |
4533 | } | |
4534 | ||
a26e8c9f | 4535 | int extent_buffer_under_io(struct extent_buffer *eb) |
db7f3436 JB |
4536 | { |
4537 | return (atomic_read(&eb->io_pages) || | |
4538 | test_bit(EXTENT_BUFFER_WRITEBACK, &eb->bflags) || | |
4539 | test_bit(EXTENT_BUFFER_DIRTY, &eb->bflags)); | |
4540 | } | |
4541 | ||
4542 | /* | |
4543 | * Helper for releasing extent buffer page. | |
4544 | */ | |
a50924e3 | 4545 | static void btrfs_release_extent_buffer_page(struct extent_buffer *eb) |
db7f3436 JB |
4546 | { |
4547 | unsigned long index; | |
db7f3436 JB |
4548 | struct page *page; |
4549 | int mapped = !test_bit(EXTENT_BUFFER_DUMMY, &eb->bflags); | |
4550 | ||
4551 | BUG_ON(extent_buffer_under_io(eb)); | |
4552 | ||
a50924e3 DS |
4553 | index = num_extent_pages(eb->start, eb->len); |
4554 | if (index == 0) | |
db7f3436 JB |
4555 | return; |
4556 | ||
4557 | do { | |
4558 | index--; | |
fb85fc9a | 4559 | page = eb->pages[index]; |
db7f3436 JB |
4560 | if (page && mapped) { |
4561 | spin_lock(&page->mapping->private_lock); | |
4562 | /* | |
4563 | * We do this since we'll remove the pages after we've | |
4564 | * removed the eb from the radix tree, so we could race | |
4565 | * and have this page now attached to the new eb. So | |
4566 | * only clear page_private if it's still connected to | |
4567 | * this eb. | |
4568 | */ | |
4569 | if (PagePrivate(page) && | |
4570 | page->private == (unsigned long)eb) { | |
4571 | BUG_ON(test_bit(EXTENT_BUFFER_DIRTY, &eb->bflags)); | |
4572 | BUG_ON(PageDirty(page)); | |
4573 | BUG_ON(PageWriteback(page)); | |
4574 | /* | |
4575 | * We need to make sure we haven't be attached | |
4576 | * to a new eb. | |
4577 | */ | |
4578 | ClearPagePrivate(page); | |
4579 | set_page_private(page, 0); | |
4580 | /* One for the page private */ | |
4581 | page_cache_release(page); | |
4582 | } | |
4583 | spin_unlock(&page->mapping->private_lock); | |
4584 | ||
4585 | } | |
4586 | if (page) { | |
4587 | /* One for when we alloced the page */ | |
4588 | page_cache_release(page); | |
4589 | } | |
a50924e3 | 4590 | } while (index != 0); |
db7f3436 JB |
4591 | } |
4592 | ||
4593 | /* | |
4594 | * Helper for releasing the extent buffer. | |
4595 | */ | |
4596 | static inline void btrfs_release_extent_buffer(struct extent_buffer *eb) | |
4597 | { | |
a50924e3 | 4598 | btrfs_release_extent_buffer_page(eb); |
db7f3436 JB |
4599 | __free_extent_buffer(eb); |
4600 | } | |
4601 | ||
f28491e0 JB |
4602 | static struct extent_buffer * |
4603 | __alloc_extent_buffer(struct btrfs_fs_info *fs_info, u64 start, | |
23d79d81 | 4604 | unsigned long len) |
d1310b2e CM |
4605 | { |
4606 | struct extent_buffer *eb = NULL; | |
4607 | ||
23d79d81 | 4608 | eb = kmem_cache_zalloc(extent_buffer_cache, GFP_NOFS); |
91ca338d TI |
4609 | if (eb == NULL) |
4610 | return NULL; | |
d1310b2e CM |
4611 | eb->start = start; |
4612 | eb->len = len; | |
f28491e0 | 4613 | eb->fs_info = fs_info; |
815a51c7 | 4614 | eb->bflags = 0; |
bd681513 CM |
4615 | rwlock_init(&eb->lock); |
4616 | atomic_set(&eb->write_locks, 0); | |
4617 | atomic_set(&eb->read_locks, 0); | |
4618 | atomic_set(&eb->blocking_readers, 0); | |
4619 | atomic_set(&eb->blocking_writers, 0); | |
4620 | atomic_set(&eb->spinning_readers, 0); | |
4621 | atomic_set(&eb->spinning_writers, 0); | |
5b25f70f | 4622 | eb->lock_nested = 0; |
bd681513 CM |
4623 | init_waitqueue_head(&eb->write_lock_wq); |
4624 | init_waitqueue_head(&eb->read_lock_wq); | |
b4ce94de | 4625 | |
6d49ba1b ES |
4626 | btrfs_leak_debug_add(&eb->leak_list, &buffers); |
4627 | ||
3083ee2e | 4628 | spin_lock_init(&eb->refs_lock); |
d1310b2e | 4629 | atomic_set(&eb->refs, 1); |
0b32f4bb | 4630 | atomic_set(&eb->io_pages, 0); |
727011e0 | 4631 | |
b8dae313 DS |
4632 | /* |
4633 | * Sanity checks, currently the maximum is 64k covered by 16x 4k pages | |
4634 | */ | |
4635 | BUILD_BUG_ON(BTRFS_MAX_METADATA_BLOCKSIZE | |
4636 | > MAX_INLINE_EXTENT_BUFFER_SIZE); | |
4637 | BUG_ON(len > MAX_INLINE_EXTENT_BUFFER_SIZE); | |
d1310b2e CM |
4638 | |
4639 | return eb; | |
4640 | } | |
4641 | ||
815a51c7 JS |
4642 | struct extent_buffer *btrfs_clone_extent_buffer(struct extent_buffer *src) |
4643 | { | |
4644 | unsigned long i; | |
4645 | struct page *p; | |
4646 | struct extent_buffer *new; | |
4647 | unsigned long num_pages = num_extent_pages(src->start, src->len); | |
4648 | ||
3f556f78 | 4649 | new = __alloc_extent_buffer(src->fs_info, src->start, src->len); |
815a51c7 JS |
4650 | if (new == NULL) |
4651 | return NULL; | |
4652 | ||
4653 | for (i = 0; i < num_pages; i++) { | |
9ec72677 | 4654 | p = alloc_page(GFP_NOFS); |
db7f3436 JB |
4655 | if (!p) { |
4656 | btrfs_release_extent_buffer(new); | |
4657 | return NULL; | |
4658 | } | |
815a51c7 JS |
4659 | attach_extent_buffer_page(new, p); |
4660 | WARN_ON(PageDirty(p)); | |
4661 | SetPageUptodate(p); | |
4662 | new->pages[i] = p; | |
4663 | } | |
4664 | ||
4665 | copy_extent_buffer(new, src, 0, 0, src->len); | |
4666 | set_bit(EXTENT_BUFFER_UPTODATE, &new->bflags); | |
4667 | set_bit(EXTENT_BUFFER_DUMMY, &new->bflags); | |
4668 | ||
4669 | return new; | |
4670 | } | |
4671 | ||
3f556f78 DS |
4672 | struct extent_buffer *alloc_dummy_extent_buffer(struct btrfs_fs_info *fs_info, |
4673 | u64 start) | |
815a51c7 JS |
4674 | { |
4675 | struct extent_buffer *eb; | |
3f556f78 DS |
4676 | unsigned long len; |
4677 | unsigned long num_pages; | |
815a51c7 JS |
4678 | unsigned long i; |
4679 | ||
3f556f78 DS |
4680 | if (!fs_info) { |
4681 | /* | |
4682 | * Called only from tests that don't always have a fs_info | |
4683 | * available, but we know that nodesize is 4096 | |
4684 | */ | |
4685 | len = 4096; | |
4686 | } else { | |
4687 | len = fs_info->tree_root->nodesize; | |
4688 | } | |
4689 | num_pages = num_extent_pages(0, len); | |
4690 | ||
4691 | eb = __alloc_extent_buffer(fs_info, start, len); | |
815a51c7 JS |
4692 | if (!eb) |
4693 | return NULL; | |
4694 | ||
4695 | for (i = 0; i < num_pages; i++) { | |
9ec72677 | 4696 | eb->pages[i] = alloc_page(GFP_NOFS); |
815a51c7 JS |
4697 | if (!eb->pages[i]) |
4698 | goto err; | |
4699 | } | |
4700 | set_extent_buffer_uptodate(eb); | |
4701 | btrfs_set_header_nritems(eb, 0); | |
4702 | set_bit(EXTENT_BUFFER_DUMMY, &eb->bflags); | |
4703 | ||
4704 | return eb; | |
4705 | err: | |
84167d19 SB |
4706 | for (; i > 0; i--) |
4707 | __free_page(eb->pages[i - 1]); | |
815a51c7 JS |
4708 | __free_extent_buffer(eb); |
4709 | return NULL; | |
4710 | } | |
4711 | ||
0b32f4bb JB |
4712 | static void check_buffer_tree_ref(struct extent_buffer *eb) |
4713 | { | |
242e18c7 | 4714 | int refs; |
0b32f4bb JB |
4715 | /* the ref bit is tricky. We have to make sure it is set |
4716 | * if we have the buffer dirty. Otherwise the | |
4717 | * code to free a buffer can end up dropping a dirty | |
4718 | * page | |
4719 | * | |
4720 | * Once the ref bit is set, it won't go away while the | |
4721 | * buffer is dirty or in writeback, and it also won't | |
4722 | * go away while we have the reference count on the | |
4723 | * eb bumped. | |
4724 | * | |
4725 | * We can't just set the ref bit without bumping the | |
4726 | * ref on the eb because free_extent_buffer might | |
4727 | * see the ref bit and try to clear it. If this happens | |
4728 | * free_extent_buffer might end up dropping our original | |
4729 | * ref by mistake and freeing the page before we are able | |
4730 | * to add one more ref. | |
4731 | * | |
4732 | * So bump the ref count first, then set the bit. If someone | |
4733 | * beat us to it, drop the ref we added. | |
4734 | */ | |
242e18c7 CM |
4735 | refs = atomic_read(&eb->refs); |
4736 | if (refs >= 2 && test_bit(EXTENT_BUFFER_TREE_REF, &eb->bflags)) | |
4737 | return; | |
4738 | ||
594831c4 JB |
4739 | spin_lock(&eb->refs_lock); |
4740 | if (!test_and_set_bit(EXTENT_BUFFER_TREE_REF, &eb->bflags)) | |
0b32f4bb | 4741 | atomic_inc(&eb->refs); |
594831c4 | 4742 | spin_unlock(&eb->refs_lock); |
0b32f4bb JB |
4743 | } |
4744 | ||
2457aec6 MG |
4745 | static void mark_extent_buffer_accessed(struct extent_buffer *eb, |
4746 | struct page *accessed) | |
5df4235e JB |
4747 | { |
4748 | unsigned long num_pages, i; | |
4749 | ||
0b32f4bb JB |
4750 | check_buffer_tree_ref(eb); |
4751 | ||
5df4235e JB |
4752 | num_pages = num_extent_pages(eb->start, eb->len); |
4753 | for (i = 0; i < num_pages; i++) { | |
fb85fc9a DS |
4754 | struct page *p = eb->pages[i]; |
4755 | ||
2457aec6 MG |
4756 | if (p != accessed) |
4757 | mark_page_accessed(p); | |
5df4235e JB |
4758 | } |
4759 | } | |
4760 | ||
f28491e0 JB |
4761 | struct extent_buffer *find_extent_buffer(struct btrfs_fs_info *fs_info, |
4762 | u64 start) | |
452c75c3 CS |
4763 | { |
4764 | struct extent_buffer *eb; | |
4765 | ||
4766 | rcu_read_lock(); | |
f28491e0 JB |
4767 | eb = radix_tree_lookup(&fs_info->buffer_radix, |
4768 | start >> PAGE_CACHE_SHIFT); | |
452c75c3 CS |
4769 | if (eb && atomic_inc_not_zero(&eb->refs)) { |
4770 | rcu_read_unlock(); | |
2457aec6 | 4771 | mark_extent_buffer_accessed(eb, NULL); |
452c75c3 CS |
4772 | return eb; |
4773 | } | |
4774 | rcu_read_unlock(); | |
4775 | ||
4776 | return NULL; | |
4777 | } | |
4778 | ||
faa2dbf0 JB |
4779 | #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS |
4780 | struct extent_buffer *alloc_test_extent_buffer(struct btrfs_fs_info *fs_info, | |
ce3e6984 | 4781 | u64 start) |
faa2dbf0 JB |
4782 | { |
4783 | struct extent_buffer *eb, *exists = NULL; | |
4784 | int ret; | |
4785 | ||
4786 | eb = find_extent_buffer(fs_info, start); | |
4787 | if (eb) | |
4788 | return eb; | |
3f556f78 | 4789 | eb = alloc_dummy_extent_buffer(fs_info, start); |
faa2dbf0 JB |
4790 | if (!eb) |
4791 | return NULL; | |
4792 | eb->fs_info = fs_info; | |
4793 | again: | |
4794 | ret = radix_tree_preload(GFP_NOFS & ~__GFP_HIGHMEM); | |
4795 | if (ret) | |
4796 | goto free_eb; | |
4797 | spin_lock(&fs_info->buffer_lock); | |
4798 | ret = radix_tree_insert(&fs_info->buffer_radix, | |
4799 | start >> PAGE_CACHE_SHIFT, eb); | |
4800 | spin_unlock(&fs_info->buffer_lock); | |
4801 | radix_tree_preload_end(); | |
4802 | if (ret == -EEXIST) { | |
4803 | exists = find_extent_buffer(fs_info, start); | |
4804 | if (exists) | |
4805 | goto free_eb; | |
4806 | else | |
4807 | goto again; | |
4808 | } | |
4809 | check_buffer_tree_ref(eb); | |
4810 | set_bit(EXTENT_BUFFER_IN_TREE, &eb->bflags); | |
4811 | ||
4812 | /* | |
4813 | * We will free dummy extent buffer's if they come into | |
4814 | * free_extent_buffer with a ref count of 2, but if we are using this we | |
4815 | * want the buffers to stay in memory until we're done with them, so | |
4816 | * bump the ref count again. | |
4817 | */ | |
4818 | atomic_inc(&eb->refs); | |
4819 | return eb; | |
4820 | free_eb: | |
4821 | btrfs_release_extent_buffer(eb); | |
4822 | return exists; | |
4823 | } | |
4824 | #endif | |
4825 | ||
f28491e0 | 4826 | struct extent_buffer *alloc_extent_buffer(struct btrfs_fs_info *fs_info, |
ce3e6984 | 4827 | u64 start) |
d1310b2e | 4828 | { |
ce3e6984 | 4829 | unsigned long len = fs_info->tree_root->nodesize; |
d1310b2e CM |
4830 | unsigned long num_pages = num_extent_pages(start, len); |
4831 | unsigned long i; | |
4832 | unsigned long index = start >> PAGE_CACHE_SHIFT; | |
4833 | struct extent_buffer *eb; | |
6af118ce | 4834 | struct extent_buffer *exists = NULL; |
d1310b2e | 4835 | struct page *p; |
f28491e0 | 4836 | struct address_space *mapping = fs_info->btree_inode->i_mapping; |
d1310b2e | 4837 | int uptodate = 1; |
19fe0a8b | 4838 | int ret; |
d1310b2e | 4839 | |
f28491e0 | 4840 | eb = find_extent_buffer(fs_info, start); |
452c75c3 | 4841 | if (eb) |
6af118ce | 4842 | return eb; |
6af118ce | 4843 | |
23d79d81 | 4844 | eb = __alloc_extent_buffer(fs_info, start, len); |
2b114d1d | 4845 | if (!eb) |
d1310b2e CM |
4846 | return NULL; |
4847 | ||
727011e0 | 4848 | for (i = 0; i < num_pages; i++, index++) { |
a6591715 | 4849 | p = find_or_create_page(mapping, index, GFP_NOFS); |
4804b382 | 4850 | if (!p) |
6af118ce | 4851 | goto free_eb; |
4f2de97a JB |
4852 | |
4853 | spin_lock(&mapping->private_lock); | |
4854 | if (PagePrivate(p)) { | |
4855 | /* | |
4856 | * We could have already allocated an eb for this page | |
4857 | * and attached one so lets see if we can get a ref on | |
4858 | * the existing eb, and if we can we know it's good and | |
4859 | * we can just return that one, else we know we can just | |
4860 | * overwrite page->private. | |
4861 | */ | |
4862 | exists = (struct extent_buffer *)p->private; | |
4863 | if (atomic_inc_not_zero(&exists->refs)) { | |
4864 | spin_unlock(&mapping->private_lock); | |
4865 | unlock_page(p); | |
17de39ac | 4866 | page_cache_release(p); |
2457aec6 | 4867 | mark_extent_buffer_accessed(exists, p); |
4f2de97a JB |
4868 | goto free_eb; |
4869 | } | |
4870 | ||
0b32f4bb | 4871 | /* |
4f2de97a JB |
4872 | * Do this so attach doesn't complain and we need to |
4873 | * drop the ref the old guy had. | |
4874 | */ | |
4875 | ClearPagePrivate(p); | |
0b32f4bb | 4876 | WARN_ON(PageDirty(p)); |
4f2de97a | 4877 | page_cache_release(p); |
d1310b2e | 4878 | } |
4f2de97a JB |
4879 | attach_extent_buffer_page(eb, p); |
4880 | spin_unlock(&mapping->private_lock); | |
0b32f4bb | 4881 | WARN_ON(PageDirty(p)); |
727011e0 | 4882 | eb->pages[i] = p; |
d1310b2e CM |
4883 | if (!PageUptodate(p)) |
4884 | uptodate = 0; | |
eb14ab8e CM |
4885 | |
4886 | /* | |
4887 | * see below about how we avoid a nasty race with release page | |
4888 | * and why we unlock later | |
4889 | */ | |
d1310b2e CM |
4890 | } |
4891 | if (uptodate) | |
b4ce94de | 4892 | set_bit(EXTENT_BUFFER_UPTODATE, &eb->bflags); |
115391d2 | 4893 | again: |
19fe0a8b MX |
4894 | ret = radix_tree_preload(GFP_NOFS & ~__GFP_HIGHMEM); |
4895 | if (ret) | |
4896 | goto free_eb; | |
4897 | ||
f28491e0 JB |
4898 | spin_lock(&fs_info->buffer_lock); |
4899 | ret = radix_tree_insert(&fs_info->buffer_radix, | |
4900 | start >> PAGE_CACHE_SHIFT, eb); | |
4901 | spin_unlock(&fs_info->buffer_lock); | |
452c75c3 | 4902 | radix_tree_preload_end(); |
19fe0a8b | 4903 | if (ret == -EEXIST) { |
f28491e0 | 4904 | exists = find_extent_buffer(fs_info, start); |
452c75c3 CS |
4905 | if (exists) |
4906 | goto free_eb; | |
4907 | else | |
115391d2 | 4908 | goto again; |
6af118ce | 4909 | } |
6af118ce | 4910 | /* add one reference for the tree */ |
0b32f4bb | 4911 | check_buffer_tree_ref(eb); |
34b41ace | 4912 | set_bit(EXTENT_BUFFER_IN_TREE, &eb->bflags); |
eb14ab8e CM |
4913 | |
4914 | /* | |
4915 | * there is a race where release page may have | |
4916 | * tried to find this extent buffer in the radix | |
4917 | * but failed. It will tell the VM it is safe to | |
4918 | * reclaim the, and it will clear the page private bit. | |
4919 | * We must make sure to set the page private bit properly | |
4920 | * after the extent buffer is in the radix tree so | |
4921 | * it doesn't get lost | |
4922 | */ | |
727011e0 CM |
4923 | SetPageChecked(eb->pages[0]); |
4924 | for (i = 1; i < num_pages; i++) { | |
fb85fc9a | 4925 | p = eb->pages[i]; |
727011e0 CM |
4926 | ClearPageChecked(p); |
4927 | unlock_page(p); | |
4928 | } | |
4929 | unlock_page(eb->pages[0]); | |
d1310b2e CM |
4930 | return eb; |
4931 | ||
6af118ce | 4932 | free_eb: |
727011e0 CM |
4933 | for (i = 0; i < num_pages; i++) { |
4934 | if (eb->pages[i]) | |
4935 | unlock_page(eb->pages[i]); | |
4936 | } | |
eb14ab8e | 4937 | |
17de39ac | 4938 | WARN_ON(!atomic_dec_and_test(&eb->refs)); |
897ca6e9 | 4939 | btrfs_release_extent_buffer(eb); |
6af118ce | 4940 | return exists; |
d1310b2e | 4941 | } |
d1310b2e | 4942 | |
3083ee2e JB |
4943 | static inline void btrfs_release_extent_buffer_rcu(struct rcu_head *head) |
4944 | { | |
4945 | struct extent_buffer *eb = | |
4946 | container_of(head, struct extent_buffer, rcu_head); | |
4947 | ||
4948 | __free_extent_buffer(eb); | |
4949 | } | |
4950 | ||
3083ee2e | 4951 | /* Expects to have eb->eb_lock already held */ |
f7a52a40 | 4952 | static int release_extent_buffer(struct extent_buffer *eb) |
3083ee2e JB |
4953 | { |
4954 | WARN_ON(atomic_read(&eb->refs) == 0); | |
4955 | if (atomic_dec_and_test(&eb->refs)) { | |
34b41ace | 4956 | if (test_and_clear_bit(EXTENT_BUFFER_IN_TREE, &eb->bflags)) { |
f28491e0 | 4957 | struct btrfs_fs_info *fs_info = eb->fs_info; |
3083ee2e | 4958 | |
815a51c7 | 4959 | spin_unlock(&eb->refs_lock); |
3083ee2e | 4960 | |
f28491e0 JB |
4961 | spin_lock(&fs_info->buffer_lock); |
4962 | radix_tree_delete(&fs_info->buffer_radix, | |
815a51c7 | 4963 | eb->start >> PAGE_CACHE_SHIFT); |
f28491e0 | 4964 | spin_unlock(&fs_info->buffer_lock); |
34b41ace JB |
4965 | } else { |
4966 | spin_unlock(&eb->refs_lock); | |
815a51c7 | 4967 | } |
3083ee2e JB |
4968 | |
4969 | /* Should be safe to release our pages at this point */ | |
a50924e3 | 4970 | btrfs_release_extent_buffer_page(eb); |
3083ee2e | 4971 | call_rcu(&eb->rcu_head, btrfs_release_extent_buffer_rcu); |
e64860aa | 4972 | return 1; |
3083ee2e JB |
4973 | } |
4974 | spin_unlock(&eb->refs_lock); | |
e64860aa JB |
4975 | |
4976 | return 0; | |
3083ee2e JB |
4977 | } |
4978 | ||
d1310b2e CM |
4979 | void free_extent_buffer(struct extent_buffer *eb) |
4980 | { | |
242e18c7 CM |
4981 | int refs; |
4982 | int old; | |
d1310b2e CM |
4983 | if (!eb) |
4984 | return; | |
4985 | ||
242e18c7 CM |
4986 | while (1) { |
4987 | refs = atomic_read(&eb->refs); | |
4988 | if (refs <= 3) | |
4989 | break; | |
4990 | old = atomic_cmpxchg(&eb->refs, refs, refs - 1); | |
4991 | if (old == refs) | |
4992 | return; | |
4993 | } | |
4994 | ||
3083ee2e | 4995 | spin_lock(&eb->refs_lock); |
815a51c7 JS |
4996 | if (atomic_read(&eb->refs) == 2 && |
4997 | test_bit(EXTENT_BUFFER_DUMMY, &eb->bflags)) | |
4998 | atomic_dec(&eb->refs); | |
4999 | ||
3083ee2e JB |
5000 | if (atomic_read(&eb->refs) == 2 && |
5001 | test_bit(EXTENT_BUFFER_STALE, &eb->bflags) && | |
0b32f4bb | 5002 | !extent_buffer_under_io(eb) && |
3083ee2e JB |
5003 | test_and_clear_bit(EXTENT_BUFFER_TREE_REF, &eb->bflags)) |
5004 | atomic_dec(&eb->refs); | |
5005 | ||
5006 | /* | |
5007 | * I know this is terrible, but it's temporary until we stop tracking | |
5008 | * the uptodate bits and such for the extent buffers. | |
5009 | */ | |
f7a52a40 | 5010 | release_extent_buffer(eb); |
3083ee2e JB |
5011 | } |
5012 | ||
5013 | void free_extent_buffer_stale(struct extent_buffer *eb) | |
5014 | { | |
5015 | if (!eb) | |
d1310b2e CM |
5016 | return; |
5017 | ||
3083ee2e JB |
5018 | spin_lock(&eb->refs_lock); |
5019 | set_bit(EXTENT_BUFFER_STALE, &eb->bflags); | |
5020 | ||
0b32f4bb | 5021 | if (atomic_read(&eb->refs) == 2 && !extent_buffer_under_io(eb) && |
3083ee2e JB |
5022 | test_and_clear_bit(EXTENT_BUFFER_TREE_REF, &eb->bflags)) |
5023 | atomic_dec(&eb->refs); | |
f7a52a40 | 5024 | release_extent_buffer(eb); |
d1310b2e | 5025 | } |
d1310b2e | 5026 | |
1d4284bd | 5027 | void clear_extent_buffer_dirty(struct extent_buffer *eb) |
d1310b2e | 5028 | { |
d1310b2e CM |
5029 | unsigned long i; |
5030 | unsigned long num_pages; | |
5031 | struct page *page; | |
5032 | ||
d1310b2e CM |
5033 | num_pages = num_extent_pages(eb->start, eb->len); |
5034 | ||
5035 | for (i = 0; i < num_pages; i++) { | |
fb85fc9a | 5036 | page = eb->pages[i]; |
b9473439 | 5037 | if (!PageDirty(page)) |
d2c3f4f6 CM |
5038 | continue; |
5039 | ||
a61e6f29 | 5040 | lock_page(page); |
eb14ab8e CM |
5041 | WARN_ON(!PagePrivate(page)); |
5042 | ||
d1310b2e | 5043 | clear_page_dirty_for_io(page); |
0ee0fda0 | 5044 | spin_lock_irq(&page->mapping->tree_lock); |
d1310b2e CM |
5045 | if (!PageDirty(page)) { |
5046 | radix_tree_tag_clear(&page->mapping->page_tree, | |
5047 | page_index(page), | |
5048 | PAGECACHE_TAG_DIRTY); | |
5049 | } | |
0ee0fda0 | 5050 | spin_unlock_irq(&page->mapping->tree_lock); |
bf0da8c1 | 5051 | ClearPageError(page); |
a61e6f29 | 5052 | unlock_page(page); |
d1310b2e | 5053 | } |
0b32f4bb | 5054 | WARN_ON(atomic_read(&eb->refs) == 0); |
d1310b2e | 5055 | } |
d1310b2e | 5056 | |
0b32f4bb | 5057 | int set_extent_buffer_dirty(struct extent_buffer *eb) |
d1310b2e CM |
5058 | { |
5059 | unsigned long i; | |
5060 | unsigned long num_pages; | |
b9473439 | 5061 | int was_dirty = 0; |
d1310b2e | 5062 | |
0b32f4bb JB |
5063 | check_buffer_tree_ref(eb); |
5064 | ||
b9473439 | 5065 | was_dirty = test_and_set_bit(EXTENT_BUFFER_DIRTY, &eb->bflags); |
0b32f4bb | 5066 | |
d1310b2e | 5067 | num_pages = num_extent_pages(eb->start, eb->len); |
3083ee2e | 5068 | WARN_ON(atomic_read(&eb->refs) == 0); |
0b32f4bb JB |
5069 | WARN_ON(!test_bit(EXTENT_BUFFER_TREE_REF, &eb->bflags)); |
5070 | ||
b9473439 | 5071 | for (i = 0; i < num_pages; i++) |
fb85fc9a | 5072 | set_page_dirty(eb->pages[i]); |
b9473439 | 5073 | return was_dirty; |
d1310b2e | 5074 | } |
d1310b2e | 5075 | |
0b32f4bb | 5076 | int clear_extent_buffer_uptodate(struct extent_buffer *eb) |
1259ab75 CM |
5077 | { |
5078 | unsigned long i; | |
5079 | struct page *page; | |
5080 | unsigned long num_pages; | |
5081 | ||
b4ce94de | 5082 | clear_bit(EXTENT_BUFFER_UPTODATE, &eb->bflags); |
0b32f4bb | 5083 | num_pages = num_extent_pages(eb->start, eb->len); |
1259ab75 | 5084 | for (i = 0; i < num_pages; i++) { |
fb85fc9a | 5085 | page = eb->pages[i]; |
33958dc6 CM |
5086 | if (page) |
5087 | ClearPageUptodate(page); | |
1259ab75 CM |
5088 | } |
5089 | return 0; | |
5090 | } | |
5091 | ||
0b32f4bb | 5092 | int set_extent_buffer_uptodate(struct extent_buffer *eb) |
d1310b2e CM |
5093 | { |
5094 | unsigned long i; | |
5095 | struct page *page; | |
5096 | unsigned long num_pages; | |
5097 | ||
0b32f4bb | 5098 | set_bit(EXTENT_BUFFER_UPTODATE, &eb->bflags); |
d1310b2e | 5099 | num_pages = num_extent_pages(eb->start, eb->len); |
d1310b2e | 5100 | for (i = 0; i < num_pages; i++) { |
fb85fc9a | 5101 | page = eb->pages[i]; |
d1310b2e CM |
5102 | SetPageUptodate(page); |
5103 | } | |
5104 | return 0; | |
5105 | } | |
d1310b2e | 5106 | |
0b32f4bb | 5107 | int extent_buffer_uptodate(struct extent_buffer *eb) |
d1310b2e | 5108 | { |
0b32f4bb | 5109 | return test_bit(EXTENT_BUFFER_UPTODATE, &eb->bflags); |
d1310b2e | 5110 | } |
d1310b2e CM |
5111 | |
5112 | int read_extent_buffer_pages(struct extent_io_tree *tree, | |
bb82ab88 | 5113 | struct extent_buffer *eb, u64 start, int wait, |
f188591e | 5114 | get_extent_t *get_extent, int mirror_num) |
d1310b2e CM |
5115 | { |
5116 | unsigned long i; | |
5117 | unsigned long start_i; | |
5118 | struct page *page; | |
5119 | int err; | |
5120 | int ret = 0; | |
ce9adaa5 CM |
5121 | int locked_pages = 0; |
5122 | int all_uptodate = 1; | |
d1310b2e | 5123 | unsigned long num_pages; |
727011e0 | 5124 | unsigned long num_reads = 0; |
a86c12c7 | 5125 | struct bio *bio = NULL; |
c8b97818 | 5126 | unsigned long bio_flags = 0; |
a86c12c7 | 5127 | |
b4ce94de | 5128 | if (test_bit(EXTENT_BUFFER_UPTODATE, &eb->bflags)) |
d1310b2e CM |
5129 | return 0; |
5130 | ||
d1310b2e CM |
5131 | if (start) { |
5132 | WARN_ON(start < eb->start); | |
5133 | start_i = (start >> PAGE_CACHE_SHIFT) - | |
5134 | (eb->start >> PAGE_CACHE_SHIFT); | |
5135 | } else { | |
5136 | start_i = 0; | |
5137 | } | |
5138 | ||
5139 | num_pages = num_extent_pages(eb->start, eb->len); | |
5140 | for (i = start_i; i < num_pages; i++) { | |
fb85fc9a | 5141 | page = eb->pages[i]; |
bb82ab88 | 5142 | if (wait == WAIT_NONE) { |
2db04966 | 5143 | if (!trylock_page(page)) |
ce9adaa5 | 5144 | goto unlock_exit; |
d1310b2e CM |
5145 | } else { |
5146 | lock_page(page); | |
5147 | } | |
ce9adaa5 | 5148 | locked_pages++; |
727011e0 CM |
5149 | if (!PageUptodate(page)) { |
5150 | num_reads++; | |
ce9adaa5 | 5151 | all_uptodate = 0; |
727011e0 | 5152 | } |
ce9adaa5 CM |
5153 | } |
5154 | if (all_uptodate) { | |
5155 | if (start_i == 0) | |
b4ce94de | 5156 | set_bit(EXTENT_BUFFER_UPTODATE, &eb->bflags); |
ce9adaa5 CM |
5157 | goto unlock_exit; |
5158 | } | |
5159 | ||
656f30db | 5160 | clear_bit(EXTENT_BUFFER_READ_ERR, &eb->bflags); |
5cf1ab56 | 5161 | eb->read_mirror = 0; |
0b32f4bb | 5162 | atomic_set(&eb->io_pages, num_reads); |
ce9adaa5 | 5163 | for (i = start_i; i < num_pages; i++) { |
fb85fc9a | 5164 | page = eb->pages[i]; |
ce9adaa5 | 5165 | if (!PageUptodate(page)) { |
f188591e | 5166 | ClearPageError(page); |
a86c12c7 | 5167 | err = __extent_read_full_page(tree, page, |
f188591e | 5168 | get_extent, &bio, |
d4c7ca86 JB |
5169 | mirror_num, &bio_flags, |
5170 | READ | REQ_META); | |
d397712b | 5171 | if (err) |
d1310b2e | 5172 | ret = err; |
d1310b2e CM |
5173 | } else { |
5174 | unlock_page(page); | |
5175 | } | |
5176 | } | |
5177 | ||
355808c2 | 5178 | if (bio) { |
d4c7ca86 JB |
5179 | err = submit_one_bio(READ | REQ_META, bio, mirror_num, |
5180 | bio_flags); | |
79787eaa JM |
5181 | if (err) |
5182 | return err; | |
355808c2 | 5183 | } |
a86c12c7 | 5184 | |
bb82ab88 | 5185 | if (ret || wait != WAIT_COMPLETE) |
d1310b2e | 5186 | return ret; |
d397712b | 5187 | |
d1310b2e | 5188 | for (i = start_i; i < num_pages; i++) { |
fb85fc9a | 5189 | page = eb->pages[i]; |
d1310b2e | 5190 | wait_on_page_locked(page); |
d397712b | 5191 | if (!PageUptodate(page)) |
d1310b2e | 5192 | ret = -EIO; |
d1310b2e | 5193 | } |
d397712b | 5194 | |
d1310b2e | 5195 | return ret; |
ce9adaa5 CM |
5196 | |
5197 | unlock_exit: | |
5198 | i = start_i; | |
d397712b | 5199 | while (locked_pages > 0) { |
fb85fc9a | 5200 | page = eb->pages[i]; |
ce9adaa5 CM |
5201 | i++; |
5202 | unlock_page(page); | |
5203 | locked_pages--; | |
5204 | } | |
5205 | return ret; | |
d1310b2e | 5206 | } |
d1310b2e CM |
5207 | |
5208 | void read_extent_buffer(struct extent_buffer *eb, void *dstv, | |
5209 | unsigned long start, | |
5210 | unsigned long len) | |
5211 | { | |
5212 | size_t cur; | |
5213 | size_t offset; | |
5214 | struct page *page; | |
5215 | char *kaddr; | |
5216 | char *dst = (char *)dstv; | |
5217 | size_t start_offset = eb->start & ((u64)PAGE_CACHE_SIZE - 1); | |
5218 | unsigned long i = (start_offset + start) >> PAGE_CACHE_SHIFT; | |
d1310b2e CM |
5219 | |
5220 | WARN_ON(start > eb->len); | |
5221 | WARN_ON(start + len > eb->start + eb->len); | |
5222 | ||
778746b5 | 5223 | offset = (start_offset + start) & (PAGE_CACHE_SIZE - 1); |
d1310b2e | 5224 | |
d397712b | 5225 | while (len > 0) { |
fb85fc9a | 5226 | page = eb->pages[i]; |
d1310b2e CM |
5227 | |
5228 | cur = min(len, (PAGE_CACHE_SIZE - offset)); | |
a6591715 | 5229 | kaddr = page_address(page); |
d1310b2e | 5230 | memcpy(dst, kaddr + offset, cur); |
d1310b2e CM |
5231 | |
5232 | dst += cur; | |
5233 | len -= cur; | |
5234 | offset = 0; | |
5235 | i++; | |
5236 | } | |
5237 | } | |
d1310b2e | 5238 | |
550ac1d8 GH |
5239 | int read_extent_buffer_to_user(struct extent_buffer *eb, void __user *dstv, |
5240 | unsigned long start, | |
5241 | unsigned long len) | |
5242 | { | |
5243 | size_t cur; | |
5244 | size_t offset; | |
5245 | struct page *page; | |
5246 | char *kaddr; | |
5247 | char __user *dst = (char __user *)dstv; | |
5248 | size_t start_offset = eb->start & ((u64)PAGE_CACHE_SIZE - 1); | |
5249 | unsigned long i = (start_offset + start) >> PAGE_CACHE_SHIFT; | |
5250 | int ret = 0; | |
5251 | ||
5252 | WARN_ON(start > eb->len); | |
5253 | WARN_ON(start + len > eb->start + eb->len); | |
5254 | ||
5255 | offset = (start_offset + start) & (PAGE_CACHE_SIZE - 1); | |
5256 | ||
5257 | while (len > 0) { | |
fb85fc9a | 5258 | page = eb->pages[i]; |
550ac1d8 GH |
5259 | |
5260 | cur = min(len, (PAGE_CACHE_SIZE - offset)); | |
5261 | kaddr = page_address(page); | |
5262 | if (copy_to_user(dst, kaddr + offset, cur)) { | |
5263 | ret = -EFAULT; | |
5264 | break; | |
5265 | } | |
5266 | ||
5267 | dst += cur; | |
5268 | len -= cur; | |
5269 | offset = 0; | |
5270 | i++; | |
5271 | } | |
5272 | ||
5273 | return ret; | |
5274 | } | |
5275 | ||
d1310b2e | 5276 | int map_private_extent_buffer(struct extent_buffer *eb, unsigned long start, |
a6591715 | 5277 | unsigned long min_len, char **map, |
d1310b2e | 5278 | unsigned long *map_start, |
a6591715 | 5279 | unsigned long *map_len) |
d1310b2e CM |
5280 | { |
5281 | size_t offset = start & (PAGE_CACHE_SIZE - 1); | |
5282 | char *kaddr; | |
5283 | struct page *p; | |
5284 | size_t start_offset = eb->start & ((u64)PAGE_CACHE_SIZE - 1); | |
5285 | unsigned long i = (start_offset + start) >> PAGE_CACHE_SHIFT; | |
5286 | unsigned long end_i = (start_offset + start + min_len - 1) >> | |
5287 | PAGE_CACHE_SHIFT; | |
5288 | ||
5289 | if (i != end_i) | |
5290 | return -EINVAL; | |
5291 | ||
5292 | if (i == 0) { | |
5293 | offset = start_offset; | |
5294 | *map_start = 0; | |
5295 | } else { | |
5296 | offset = 0; | |
5297 | *map_start = ((u64)i << PAGE_CACHE_SHIFT) - start_offset; | |
5298 | } | |
d397712b | 5299 | |
d1310b2e | 5300 | if (start + min_len > eb->len) { |
31b1a2bd | 5301 | WARN(1, KERN_ERR "btrfs bad mapping eb start %llu len %lu, " |
c1c9ff7c GU |
5302 | "wanted %lu %lu\n", |
5303 | eb->start, eb->len, start, min_len); | |
85026533 | 5304 | return -EINVAL; |
d1310b2e CM |
5305 | } |
5306 | ||
fb85fc9a | 5307 | p = eb->pages[i]; |
a6591715 | 5308 | kaddr = page_address(p); |
d1310b2e CM |
5309 | *map = kaddr + offset; |
5310 | *map_len = PAGE_CACHE_SIZE - offset; | |
5311 | return 0; | |
5312 | } | |
d1310b2e | 5313 | |
d1310b2e CM |
5314 | int memcmp_extent_buffer(struct extent_buffer *eb, const void *ptrv, |
5315 | unsigned long start, | |
5316 | unsigned long len) | |
5317 | { | |
5318 | size_t cur; | |
5319 | size_t offset; | |
5320 | struct page *page; | |
5321 | char *kaddr; | |
5322 | char *ptr = (char *)ptrv; | |
5323 | size_t start_offset = eb->start & ((u64)PAGE_CACHE_SIZE - 1); | |
5324 | unsigned long i = (start_offset + start) >> PAGE_CACHE_SHIFT; | |
5325 | int ret = 0; | |
5326 | ||
5327 | WARN_ON(start > eb->len); | |
5328 | WARN_ON(start + len > eb->start + eb->len); | |
5329 | ||
778746b5 | 5330 | offset = (start_offset + start) & (PAGE_CACHE_SIZE - 1); |
d1310b2e | 5331 | |
d397712b | 5332 | while (len > 0) { |
fb85fc9a | 5333 | page = eb->pages[i]; |
d1310b2e CM |
5334 | |
5335 | cur = min(len, (PAGE_CACHE_SIZE - offset)); | |
5336 | ||
a6591715 | 5337 | kaddr = page_address(page); |
d1310b2e | 5338 | ret = memcmp(ptr, kaddr + offset, cur); |
d1310b2e CM |
5339 | if (ret) |
5340 | break; | |
5341 | ||
5342 | ptr += cur; | |
5343 | len -= cur; | |
5344 | offset = 0; | |
5345 | i++; | |
5346 | } | |
5347 | return ret; | |
5348 | } | |
d1310b2e CM |
5349 | |
5350 | void write_extent_buffer(struct extent_buffer *eb, const void *srcv, | |
5351 | unsigned long start, unsigned long len) | |
5352 | { | |
5353 | size_t cur; | |
5354 | size_t offset; | |
5355 | struct page *page; | |
5356 | char *kaddr; | |
5357 | char *src = (char *)srcv; | |
5358 | size_t start_offset = eb->start & ((u64)PAGE_CACHE_SIZE - 1); | |
5359 | unsigned long i = (start_offset + start) >> PAGE_CACHE_SHIFT; | |
5360 | ||
5361 | WARN_ON(start > eb->len); | |
5362 | WARN_ON(start + len > eb->start + eb->len); | |
5363 | ||
778746b5 | 5364 | offset = (start_offset + start) & (PAGE_CACHE_SIZE - 1); |
d1310b2e | 5365 | |
d397712b | 5366 | while (len > 0) { |
fb85fc9a | 5367 | page = eb->pages[i]; |
d1310b2e CM |
5368 | WARN_ON(!PageUptodate(page)); |
5369 | ||
5370 | cur = min(len, PAGE_CACHE_SIZE - offset); | |
a6591715 | 5371 | kaddr = page_address(page); |
d1310b2e | 5372 | memcpy(kaddr + offset, src, cur); |
d1310b2e CM |
5373 | |
5374 | src += cur; | |
5375 | len -= cur; | |
5376 | offset = 0; | |
5377 | i++; | |
5378 | } | |
5379 | } | |
d1310b2e CM |
5380 | |
5381 | void memset_extent_buffer(struct extent_buffer *eb, char c, | |
5382 | unsigned long start, unsigned long len) | |
5383 | { | |
5384 | size_t cur; | |
5385 | size_t offset; | |
5386 | struct page *page; | |
5387 | char *kaddr; | |
5388 | size_t start_offset = eb->start & ((u64)PAGE_CACHE_SIZE - 1); | |
5389 | unsigned long i = (start_offset + start) >> PAGE_CACHE_SHIFT; | |
5390 | ||
5391 | WARN_ON(start > eb->len); | |
5392 | WARN_ON(start + len > eb->start + eb->len); | |
5393 | ||
778746b5 | 5394 | offset = (start_offset + start) & (PAGE_CACHE_SIZE - 1); |
d1310b2e | 5395 | |
d397712b | 5396 | while (len > 0) { |
fb85fc9a | 5397 | page = eb->pages[i]; |
d1310b2e CM |
5398 | WARN_ON(!PageUptodate(page)); |
5399 | ||
5400 | cur = min(len, PAGE_CACHE_SIZE - offset); | |
a6591715 | 5401 | kaddr = page_address(page); |
d1310b2e | 5402 | memset(kaddr + offset, c, cur); |
d1310b2e CM |
5403 | |
5404 | len -= cur; | |
5405 | offset = 0; | |
5406 | i++; | |
5407 | } | |
5408 | } | |
d1310b2e CM |
5409 | |
5410 | void copy_extent_buffer(struct extent_buffer *dst, struct extent_buffer *src, | |
5411 | unsigned long dst_offset, unsigned long src_offset, | |
5412 | unsigned long len) | |
5413 | { | |
5414 | u64 dst_len = dst->len; | |
5415 | size_t cur; | |
5416 | size_t offset; | |
5417 | struct page *page; | |
5418 | char *kaddr; | |
5419 | size_t start_offset = dst->start & ((u64)PAGE_CACHE_SIZE - 1); | |
5420 | unsigned long i = (start_offset + dst_offset) >> PAGE_CACHE_SHIFT; | |
5421 | ||
5422 | WARN_ON(src->len != dst_len); | |
5423 | ||
5424 | offset = (start_offset + dst_offset) & | |
778746b5 | 5425 | (PAGE_CACHE_SIZE - 1); |
d1310b2e | 5426 | |
d397712b | 5427 | while (len > 0) { |
fb85fc9a | 5428 | page = dst->pages[i]; |
d1310b2e CM |
5429 | WARN_ON(!PageUptodate(page)); |
5430 | ||
5431 | cur = min(len, (unsigned long)(PAGE_CACHE_SIZE - offset)); | |
5432 | ||
a6591715 | 5433 | kaddr = page_address(page); |
d1310b2e | 5434 | read_extent_buffer(src, kaddr + offset, src_offset, cur); |
d1310b2e CM |
5435 | |
5436 | src_offset += cur; | |
5437 | len -= cur; | |
5438 | offset = 0; | |
5439 | i++; | |
5440 | } | |
5441 | } | |
d1310b2e | 5442 | |
3387206f ST |
5443 | static inline bool areas_overlap(unsigned long src, unsigned long dst, unsigned long len) |
5444 | { | |
5445 | unsigned long distance = (src > dst) ? src - dst : dst - src; | |
5446 | return distance < len; | |
5447 | } | |
5448 | ||
d1310b2e CM |
5449 | static void copy_pages(struct page *dst_page, struct page *src_page, |
5450 | unsigned long dst_off, unsigned long src_off, | |
5451 | unsigned long len) | |
5452 | { | |
a6591715 | 5453 | char *dst_kaddr = page_address(dst_page); |
d1310b2e | 5454 | char *src_kaddr; |
727011e0 | 5455 | int must_memmove = 0; |
d1310b2e | 5456 | |
3387206f | 5457 | if (dst_page != src_page) { |
a6591715 | 5458 | src_kaddr = page_address(src_page); |
3387206f | 5459 | } else { |
d1310b2e | 5460 | src_kaddr = dst_kaddr; |
727011e0 CM |
5461 | if (areas_overlap(src_off, dst_off, len)) |
5462 | must_memmove = 1; | |
3387206f | 5463 | } |
d1310b2e | 5464 | |
727011e0 CM |
5465 | if (must_memmove) |
5466 | memmove(dst_kaddr + dst_off, src_kaddr + src_off, len); | |
5467 | else | |
5468 | memcpy(dst_kaddr + dst_off, src_kaddr + src_off, len); | |
d1310b2e CM |
5469 | } |
5470 | ||
5471 | void memcpy_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset, | |
5472 | unsigned long src_offset, unsigned long len) | |
5473 | { | |
5474 | size_t cur; | |
5475 | size_t dst_off_in_page; | |
5476 | size_t src_off_in_page; | |
5477 | size_t start_offset = dst->start & ((u64)PAGE_CACHE_SIZE - 1); | |
5478 | unsigned long dst_i; | |
5479 | unsigned long src_i; | |
5480 | ||
5481 | if (src_offset + len > dst->len) { | |
efe120a0 | 5482 | printk(KERN_ERR "BTRFS: memmove bogus src_offset %lu move " |
d397712b | 5483 | "len %lu dst len %lu\n", src_offset, len, dst->len); |
d1310b2e CM |
5484 | BUG_ON(1); |
5485 | } | |
5486 | if (dst_offset + len > dst->len) { | |
efe120a0 | 5487 | printk(KERN_ERR "BTRFS: memmove bogus dst_offset %lu move " |
d397712b | 5488 | "len %lu dst len %lu\n", dst_offset, len, dst->len); |
d1310b2e CM |
5489 | BUG_ON(1); |
5490 | } | |
5491 | ||
d397712b | 5492 | while (len > 0) { |
d1310b2e | 5493 | dst_off_in_page = (start_offset + dst_offset) & |
778746b5 | 5494 | (PAGE_CACHE_SIZE - 1); |
d1310b2e | 5495 | src_off_in_page = (start_offset + src_offset) & |
778746b5 | 5496 | (PAGE_CACHE_SIZE - 1); |
d1310b2e CM |
5497 | |
5498 | dst_i = (start_offset + dst_offset) >> PAGE_CACHE_SHIFT; | |
5499 | src_i = (start_offset + src_offset) >> PAGE_CACHE_SHIFT; | |
5500 | ||
5501 | cur = min(len, (unsigned long)(PAGE_CACHE_SIZE - | |
5502 | src_off_in_page)); | |
5503 | cur = min_t(unsigned long, cur, | |
5504 | (unsigned long)(PAGE_CACHE_SIZE - dst_off_in_page)); | |
5505 | ||
fb85fc9a | 5506 | copy_pages(dst->pages[dst_i], dst->pages[src_i], |
d1310b2e CM |
5507 | dst_off_in_page, src_off_in_page, cur); |
5508 | ||
5509 | src_offset += cur; | |
5510 | dst_offset += cur; | |
5511 | len -= cur; | |
5512 | } | |
5513 | } | |
d1310b2e CM |
5514 | |
5515 | void memmove_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset, | |
5516 | unsigned long src_offset, unsigned long len) | |
5517 | { | |
5518 | size_t cur; | |
5519 | size_t dst_off_in_page; | |
5520 | size_t src_off_in_page; | |
5521 | unsigned long dst_end = dst_offset + len - 1; | |
5522 | unsigned long src_end = src_offset + len - 1; | |
5523 | size_t start_offset = dst->start & ((u64)PAGE_CACHE_SIZE - 1); | |
5524 | unsigned long dst_i; | |
5525 | unsigned long src_i; | |
5526 | ||
5527 | if (src_offset + len > dst->len) { | |
efe120a0 | 5528 | printk(KERN_ERR "BTRFS: memmove bogus src_offset %lu move " |
d397712b | 5529 | "len %lu len %lu\n", src_offset, len, dst->len); |
d1310b2e CM |
5530 | BUG_ON(1); |
5531 | } | |
5532 | if (dst_offset + len > dst->len) { | |
efe120a0 | 5533 | printk(KERN_ERR "BTRFS: memmove bogus dst_offset %lu move " |
d397712b | 5534 | "len %lu len %lu\n", dst_offset, len, dst->len); |
d1310b2e CM |
5535 | BUG_ON(1); |
5536 | } | |
727011e0 | 5537 | if (dst_offset < src_offset) { |
d1310b2e CM |
5538 | memcpy_extent_buffer(dst, dst_offset, src_offset, len); |
5539 | return; | |
5540 | } | |
d397712b | 5541 | while (len > 0) { |
d1310b2e CM |
5542 | dst_i = (start_offset + dst_end) >> PAGE_CACHE_SHIFT; |
5543 | src_i = (start_offset + src_end) >> PAGE_CACHE_SHIFT; | |
5544 | ||
5545 | dst_off_in_page = (start_offset + dst_end) & | |
778746b5 | 5546 | (PAGE_CACHE_SIZE - 1); |
d1310b2e | 5547 | src_off_in_page = (start_offset + src_end) & |
778746b5 | 5548 | (PAGE_CACHE_SIZE - 1); |
d1310b2e CM |
5549 | |
5550 | cur = min_t(unsigned long, len, src_off_in_page + 1); | |
5551 | cur = min(cur, dst_off_in_page + 1); | |
fb85fc9a | 5552 | copy_pages(dst->pages[dst_i], dst->pages[src_i], |
d1310b2e CM |
5553 | dst_off_in_page - cur + 1, |
5554 | src_off_in_page - cur + 1, cur); | |
5555 | ||
5556 | dst_end -= cur; | |
5557 | src_end -= cur; | |
5558 | len -= cur; | |
5559 | } | |
5560 | } | |
6af118ce | 5561 | |
f7a52a40 | 5562 | int try_release_extent_buffer(struct page *page) |
19fe0a8b | 5563 | { |
6af118ce | 5564 | struct extent_buffer *eb; |
6af118ce | 5565 | |
3083ee2e JB |
5566 | /* |
5567 | * We need to make sure noboody is attaching this page to an eb right | |
5568 | * now. | |
5569 | */ | |
5570 | spin_lock(&page->mapping->private_lock); | |
5571 | if (!PagePrivate(page)) { | |
5572 | spin_unlock(&page->mapping->private_lock); | |
4f2de97a | 5573 | return 1; |
45f49bce | 5574 | } |
6af118ce | 5575 | |
3083ee2e JB |
5576 | eb = (struct extent_buffer *)page->private; |
5577 | BUG_ON(!eb); | |
19fe0a8b MX |
5578 | |
5579 | /* | |
3083ee2e JB |
5580 | * This is a little awful but should be ok, we need to make sure that |
5581 | * the eb doesn't disappear out from under us while we're looking at | |
5582 | * this page. | |
19fe0a8b | 5583 | */ |
3083ee2e | 5584 | spin_lock(&eb->refs_lock); |
0b32f4bb | 5585 | if (atomic_read(&eb->refs) != 1 || extent_buffer_under_io(eb)) { |
3083ee2e JB |
5586 | spin_unlock(&eb->refs_lock); |
5587 | spin_unlock(&page->mapping->private_lock); | |
5588 | return 0; | |
b9473439 | 5589 | } |
3083ee2e | 5590 | spin_unlock(&page->mapping->private_lock); |
897ca6e9 | 5591 | |
19fe0a8b | 5592 | /* |
3083ee2e JB |
5593 | * If tree ref isn't set then we know the ref on this eb is a real ref, |
5594 | * so just return, this page will likely be freed soon anyway. | |
19fe0a8b | 5595 | */ |
3083ee2e JB |
5596 | if (!test_and_clear_bit(EXTENT_BUFFER_TREE_REF, &eb->bflags)) { |
5597 | spin_unlock(&eb->refs_lock); | |
5598 | return 0; | |
b9473439 | 5599 | } |
19fe0a8b | 5600 | |
f7a52a40 | 5601 | return release_extent_buffer(eb); |
6af118ce | 5602 | } |