]>
Commit | Line | Data |
---|---|---|
d1310b2e CM |
1 | #include <linux/bitops.h> |
2 | #include <linux/slab.h> | |
3 | #include <linux/bio.h> | |
4 | #include <linux/mm.h> | |
d1310b2e CM |
5 | #include <linux/pagemap.h> |
6 | #include <linux/page-flags.h> | |
d1310b2e CM |
7 | #include <linux/spinlock.h> |
8 | #include <linux/blkdev.h> | |
9 | #include <linux/swap.h> | |
d1310b2e CM |
10 | #include <linux/writeback.h> |
11 | #include <linux/pagevec.h> | |
268bb0ce | 12 | #include <linux/prefetch.h> |
90a887c9 | 13 | #include <linux/cleancache.h> |
d1310b2e CM |
14 | #include "extent_io.h" |
15 | #include "extent_map.h" | |
902b22f3 DW |
16 | #include "ctree.h" |
17 | #include "btrfs_inode.h" | |
4a54c8c1 | 18 | #include "volumes.h" |
21adbd5c | 19 | #include "check-integrity.h" |
0b32f4bb | 20 | #include "locking.h" |
606686ee | 21 | #include "rcu-string.h" |
fe09e16c | 22 | #include "backref.h" |
d1310b2e | 23 | |
d1310b2e CM |
24 | static struct kmem_cache *extent_state_cache; |
25 | static struct kmem_cache *extent_buffer_cache; | |
9be3395b | 26 | static struct bio_set *btrfs_bioset; |
d1310b2e | 27 | |
6d49ba1b | 28 | #ifdef CONFIG_BTRFS_DEBUG |
d1310b2e CM |
29 | static LIST_HEAD(buffers); |
30 | static LIST_HEAD(states); | |
4bef0848 | 31 | |
d397712b | 32 | static DEFINE_SPINLOCK(leak_lock); |
6d49ba1b ES |
33 | |
34 | static inline | |
35 | void btrfs_leak_debug_add(struct list_head *new, struct list_head *head) | |
36 | { | |
37 | unsigned long flags; | |
38 | ||
39 | spin_lock_irqsave(&leak_lock, flags); | |
40 | list_add(new, head); | |
41 | spin_unlock_irqrestore(&leak_lock, flags); | |
42 | } | |
43 | ||
44 | static inline | |
45 | void btrfs_leak_debug_del(struct list_head *entry) | |
46 | { | |
47 | unsigned long flags; | |
48 | ||
49 | spin_lock_irqsave(&leak_lock, flags); | |
50 | list_del(entry); | |
51 | spin_unlock_irqrestore(&leak_lock, flags); | |
52 | } | |
53 | ||
54 | static inline | |
55 | void btrfs_leak_debug_check(void) | |
56 | { | |
57 | struct extent_state *state; | |
58 | struct extent_buffer *eb; | |
59 | ||
60 | while (!list_empty(&states)) { | |
61 | state = list_entry(states.next, struct extent_state, leak_list); | |
efe120a0 | 62 | printk(KERN_ERR "BTRFS: state leak: start %llu end %llu " |
6d49ba1b | 63 | "state %lu in tree %p refs %d\n", |
c1c9ff7c GU |
64 | state->start, state->end, state->state, state->tree, |
65 | atomic_read(&state->refs)); | |
6d49ba1b ES |
66 | list_del(&state->leak_list); |
67 | kmem_cache_free(extent_state_cache, state); | |
68 | } | |
69 | ||
70 | while (!list_empty(&buffers)) { | |
71 | eb = list_entry(buffers.next, struct extent_buffer, leak_list); | |
efe120a0 | 72 | printk(KERN_ERR "BTRFS: buffer leak start %llu len %lu " |
c1c9ff7c GU |
73 | "refs %d\n", |
74 | eb->start, eb->len, atomic_read(&eb->refs)); | |
6d49ba1b ES |
75 | list_del(&eb->leak_list); |
76 | kmem_cache_free(extent_buffer_cache, eb); | |
77 | } | |
78 | } | |
8d599ae1 | 79 | |
a5dee37d JB |
80 | #define btrfs_debug_check_extent_io_range(tree, start, end) \ |
81 | __btrfs_debug_check_extent_io_range(__func__, (tree), (start), (end)) | |
8d599ae1 | 82 | static inline void __btrfs_debug_check_extent_io_range(const char *caller, |
a5dee37d | 83 | struct extent_io_tree *tree, u64 start, u64 end) |
8d599ae1 | 84 | { |
a5dee37d JB |
85 | struct inode *inode; |
86 | u64 isize; | |
8d599ae1 | 87 | |
a5dee37d JB |
88 | if (!tree->mapping) |
89 | return; | |
8d599ae1 | 90 | |
a5dee37d JB |
91 | inode = tree->mapping->host; |
92 | isize = i_size_read(inode); | |
8d599ae1 DS |
93 | if (end >= PAGE_SIZE && (end % 2) == 0 && end != isize - 1) { |
94 | printk_ratelimited(KERN_DEBUG | |
efe120a0 | 95 | "BTRFS: %s: ino %llu isize %llu odd range [%llu,%llu]\n", |
c1c9ff7c | 96 | caller, btrfs_ino(inode), isize, start, end); |
8d599ae1 DS |
97 | } |
98 | } | |
6d49ba1b ES |
99 | #else |
100 | #define btrfs_leak_debug_add(new, head) do {} while (0) | |
101 | #define btrfs_leak_debug_del(entry) do {} while (0) | |
102 | #define btrfs_leak_debug_check() do {} while (0) | |
8d599ae1 | 103 | #define btrfs_debug_check_extent_io_range(c, s, e) do {} while (0) |
4bef0848 | 104 | #endif |
d1310b2e | 105 | |
d1310b2e CM |
106 | #define BUFFER_LRU_MAX 64 |
107 | ||
108 | struct tree_entry { | |
109 | u64 start; | |
110 | u64 end; | |
d1310b2e CM |
111 | struct rb_node rb_node; |
112 | }; | |
113 | ||
114 | struct extent_page_data { | |
115 | struct bio *bio; | |
116 | struct extent_io_tree *tree; | |
117 | get_extent_t *get_extent; | |
de0022b9 | 118 | unsigned long bio_flags; |
771ed689 CM |
119 | |
120 | /* tells writepage not to lock the state bits for this range | |
121 | * it still does the unlocking | |
122 | */ | |
ffbd517d CM |
123 | unsigned int extent_locked:1; |
124 | ||
125 | /* tells the submit_bio code to use a WRITE_SYNC */ | |
126 | unsigned int sync_io:1; | |
d1310b2e CM |
127 | }; |
128 | ||
0b32f4bb | 129 | static noinline void flush_write_bio(void *data); |
c2d904e0 JM |
130 | static inline struct btrfs_fs_info * |
131 | tree_fs_info(struct extent_io_tree *tree) | |
132 | { | |
a5dee37d JB |
133 | if (!tree->mapping) |
134 | return NULL; | |
c2d904e0 JM |
135 | return btrfs_sb(tree->mapping->host->i_sb); |
136 | } | |
0b32f4bb | 137 | |
d1310b2e CM |
138 | int __init extent_io_init(void) |
139 | { | |
837e1972 | 140 | extent_state_cache = kmem_cache_create("btrfs_extent_state", |
9601e3f6 CH |
141 | sizeof(struct extent_state), 0, |
142 | SLAB_RECLAIM_ACCOUNT | SLAB_MEM_SPREAD, NULL); | |
d1310b2e CM |
143 | if (!extent_state_cache) |
144 | return -ENOMEM; | |
145 | ||
837e1972 | 146 | extent_buffer_cache = kmem_cache_create("btrfs_extent_buffer", |
9601e3f6 CH |
147 | sizeof(struct extent_buffer), 0, |
148 | SLAB_RECLAIM_ACCOUNT | SLAB_MEM_SPREAD, NULL); | |
d1310b2e CM |
149 | if (!extent_buffer_cache) |
150 | goto free_state_cache; | |
9be3395b CM |
151 | |
152 | btrfs_bioset = bioset_create(BIO_POOL_SIZE, | |
153 | offsetof(struct btrfs_io_bio, bio)); | |
154 | if (!btrfs_bioset) | |
155 | goto free_buffer_cache; | |
b208c2f7 DW |
156 | |
157 | if (bioset_integrity_create(btrfs_bioset, BIO_POOL_SIZE)) | |
158 | goto free_bioset; | |
159 | ||
d1310b2e CM |
160 | return 0; |
161 | ||
b208c2f7 DW |
162 | free_bioset: |
163 | bioset_free(btrfs_bioset); | |
164 | btrfs_bioset = NULL; | |
165 | ||
9be3395b CM |
166 | free_buffer_cache: |
167 | kmem_cache_destroy(extent_buffer_cache); | |
168 | extent_buffer_cache = NULL; | |
169 | ||
d1310b2e CM |
170 | free_state_cache: |
171 | kmem_cache_destroy(extent_state_cache); | |
9be3395b | 172 | extent_state_cache = NULL; |
d1310b2e CM |
173 | return -ENOMEM; |
174 | } | |
175 | ||
176 | void extent_io_exit(void) | |
177 | { | |
6d49ba1b | 178 | btrfs_leak_debug_check(); |
8c0a8537 KS |
179 | |
180 | /* | |
181 | * Make sure all delayed rcu free are flushed before we | |
182 | * destroy caches. | |
183 | */ | |
184 | rcu_barrier(); | |
d1310b2e CM |
185 | if (extent_state_cache) |
186 | kmem_cache_destroy(extent_state_cache); | |
187 | if (extent_buffer_cache) | |
188 | kmem_cache_destroy(extent_buffer_cache); | |
9be3395b CM |
189 | if (btrfs_bioset) |
190 | bioset_free(btrfs_bioset); | |
d1310b2e CM |
191 | } |
192 | ||
193 | void extent_io_tree_init(struct extent_io_tree *tree, | |
f993c883 | 194 | struct address_space *mapping) |
d1310b2e | 195 | { |
6bef4d31 | 196 | tree->state = RB_ROOT; |
d1310b2e CM |
197 | tree->ops = NULL; |
198 | tree->dirty_bytes = 0; | |
70dec807 | 199 | spin_lock_init(&tree->lock); |
d1310b2e | 200 | tree->mapping = mapping; |
d1310b2e | 201 | } |
d1310b2e | 202 | |
b2950863 | 203 | static struct extent_state *alloc_extent_state(gfp_t mask) |
d1310b2e CM |
204 | { |
205 | struct extent_state *state; | |
d1310b2e CM |
206 | |
207 | state = kmem_cache_alloc(extent_state_cache, mask); | |
2b114d1d | 208 | if (!state) |
d1310b2e CM |
209 | return state; |
210 | state->state = 0; | |
d1310b2e | 211 | state->private = 0; |
70dec807 | 212 | state->tree = NULL; |
6d49ba1b | 213 | btrfs_leak_debug_add(&state->leak_list, &states); |
d1310b2e CM |
214 | atomic_set(&state->refs, 1); |
215 | init_waitqueue_head(&state->wq); | |
143bede5 | 216 | trace_alloc_extent_state(state, mask, _RET_IP_); |
d1310b2e CM |
217 | return state; |
218 | } | |
d1310b2e | 219 | |
4845e44f | 220 | void free_extent_state(struct extent_state *state) |
d1310b2e | 221 | { |
d1310b2e CM |
222 | if (!state) |
223 | return; | |
224 | if (atomic_dec_and_test(&state->refs)) { | |
70dec807 | 225 | WARN_ON(state->tree); |
6d49ba1b | 226 | btrfs_leak_debug_del(&state->leak_list); |
143bede5 | 227 | trace_free_extent_state(state, _RET_IP_); |
d1310b2e CM |
228 | kmem_cache_free(extent_state_cache, state); |
229 | } | |
230 | } | |
d1310b2e | 231 | |
f2071b21 FM |
232 | static struct rb_node *tree_insert(struct rb_root *root, |
233 | struct rb_node *search_start, | |
234 | u64 offset, | |
12cfbad9 FDBM |
235 | struct rb_node *node, |
236 | struct rb_node ***p_in, | |
237 | struct rb_node **parent_in) | |
d1310b2e | 238 | { |
f2071b21 | 239 | struct rb_node **p; |
d397712b | 240 | struct rb_node *parent = NULL; |
d1310b2e CM |
241 | struct tree_entry *entry; |
242 | ||
12cfbad9 FDBM |
243 | if (p_in && parent_in) { |
244 | p = *p_in; | |
245 | parent = *parent_in; | |
246 | goto do_insert; | |
247 | } | |
248 | ||
f2071b21 | 249 | p = search_start ? &search_start : &root->rb_node; |
d397712b | 250 | while (*p) { |
d1310b2e CM |
251 | parent = *p; |
252 | entry = rb_entry(parent, struct tree_entry, rb_node); | |
253 | ||
254 | if (offset < entry->start) | |
255 | p = &(*p)->rb_left; | |
256 | else if (offset > entry->end) | |
257 | p = &(*p)->rb_right; | |
258 | else | |
259 | return parent; | |
260 | } | |
261 | ||
12cfbad9 | 262 | do_insert: |
d1310b2e CM |
263 | rb_link_node(node, parent, p); |
264 | rb_insert_color(node, root); | |
265 | return NULL; | |
266 | } | |
267 | ||
80ea96b1 | 268 | static struct rb_node *__etree_search(struct extent_io_tree *tree, u64 offset, |
12cfbad9 FDBM |
269 | struct rb_node **prev_ret, |
270 | struct rb_node **next_ret, | |
271 | struct rb_node ***p_ret, | |
272 | struct rb_node **parent_ret) | |
d1310b2e | 273 | { |
80ea96b1 | 274 | struct rb_root *root = &tree->state; |
12cfbad9 | 275 | struct rb_node **n = &root->rb_node; |
d1310b2e CM |
276 | struct rb_node *prev = NULL; |
277 | struct rb_node *orig_prev = NULL; | |
278 | struct tree_entry *entry; | |
279 | struct tree_entry *prev_entry = NULL; | |
280 | ||
12cfbad9 FDBM |
281 | while (*n) { |
282 | prev = *n; | |
283 | entry = rb_entry(prev, struct tree_entry, rb_node); | |
d1310b2e CM |
284 | prev_entry = entry; |
285 | ||
286 | if (offset < entry->start) | |
12cfbad9 | 287 | n = &(*n)->rb_left; |
d1310b2e | 288 | else if (offset > entry->end) |
12cfbad9 | 289 | n = &(*n)->rb_right; |
d397712b | 290 | else |
12cfbad9 | 291 | return *n; |
d1310b2e CM |
292 | } |
293 | ||
12cfbad9 FDBM |
294 | if (p_ret) |
295 | *p_ret = n; | |
296 | if (parent_ret) | |
297 | *parent_ret = prev; | |
298 | ||
d1310b2e CM |
299 | if (prev_ret) { |
300 | orig_prev = prev; | |
d397712b | 301 | while (prev && offset > prev_entry->end) { |
d1310b2e CM |
302 | prev = rb_next(prev); |
303 | prev_entry = rb_entry(prev, struct tree_entry, rb_node); | |
304 | } | |
305 | *prev_ret = prev; | |
306 | prev = orig_prev; | |
307 | } | |
308 | ||
309 | if (next_ret) { | |
310 | prev_entry = rb_entry(prev, struct tree_entry, rb_node); | |
d397712b | 311 | while (prev && offset < prev_entry->start) { |
d1310b2e CM |
312 | prev = rb_prev(prev); |
313 | prev_entry = rb_entry(prev, struct tree_entry, rb_node); | |
314 | } | |
315 | *next_ret = prev; | |
316 | } | |
317 | return NULL; | |
318 | } | |
319 | ||
12cfbad9 FDBM |
320 | static inline struct rb_node * |
321 | tree_search_for_insert(struct extent_io_tree *tree, | |
322 | u64 offset, | |
323 | struct rb_node ***p_ret, | |
324 | struct rb_node **parent_ret) | |
d1310b2e | 325 | { |
70dec807 | 326 | struct rb_node *prev = NULL; |
d1310b2e | 327 | struct rb_node *ret; |
70dec807 | 328 | |
12cfbad9 | 329 | ret = __etree_search(tree, offset, &prev, NULL, p_ret, parent_ret); |
d397712b | 330 | if (!ret) |
d1310b2e CM |
331 | return prev; |
332 | return ret; | |
333 | } | |
334 | ||
12cfbad9 FDBM |
335 | static inline struct rb_node *tree_search(struct extent_io_tree *tree, |
336 | u64 offset) | |
337 | { | |
338 | return tree_search_for_insert(tree, offset, NULL, NULL); | |
339 | } | |
340 | ||
9ed74f2d JB |
341 | static void merge_cb(struct extent_io_tree *tree, struct extent_state *new, |
342 | struct extent_state *other) | |
343 | { | |
344 | if (tree->ops && tree->ops->merge_extent_hook) | |
345 | tree->ops->merge_extent_hook(tree->mapping->host, new, | |
346 | other); | |
347 | } | |
348 | ||
d1310b2e CM |
349 | /* |
350 | * utility function to look for merge candidates inside a given range. | |
351 | * Any extents with matching state are merged together into a single | |
352 | * extent in the tree. Extents with EXTENT_IO in their state field | |
353 | * are not merged because the end_io handlers need to be able to do | |
354 | * operations on them without sleeping (or doing allocations/splits). | |
355 | * | |
356 | * This should be called with the tree lock held. | |
357 | */ | |
1bf85046 JM |
358 | static void merge_state(struct extent_io_tree *tree, |
359 | struct extent_state *state) | |
d1310b2e CM |
360 | { |
361 | struct extent_state *other; | |
362 | struct rb_node *other_node; | |
363 | ||
5b21f2ed | 364 | if (state->state & (EXTENT_IOBITS | EXTENT_BOUNDARY)) |
1bf85046 | 365 | return; |
d1310b2e CM |
366 | |
367 | other_node = rb_prev(&state->rb_node); | |
368 | if (other_node) { | |
369 | other = rb_entry(other_node, struct extent_state, rb_node); | |
370 | if (other->end == state->start - 1 && | |
371 | other->state == state->state) { | |
9ed74f2d | 372 | merge_cb(tree, state, other); |
d1310b2e | 373 | state->start = other->start; |
70dec807 | 374 | other->tree = NULL; |
d1310b2e CM |
375 | rb_erase(&other->rb_node, &tree->state); |
376 | free_extent_state(other); | |
377 | } | |
378 | } | |
379 | other_node = rb_next(&state->rb_node); | |
380 | if (other_node) { | |
381 | other = rb_entry(other_node, struct extent_state, rb_node); | |
382 | if (other->start == state->end + 1 && | |
383 | other->state == state->state) { | |
9ed74f2d | 384 | merge_cb(tree, state, other); |
df98b6e2 JB |
385 | state->end = other->end; |
386 | other->tree = NULL; | |
387 | rb_erase(&other->rb_node, &tree->state); | |
388 | free_extent_state(other); | |
d1310b2e CM |
389 | } |
390 | } | |
d1310b2e CM |
391 | } |
392 | ||
1bf85046 | 393 | static void set_state_cb(struct extent_io_tree *tree, |
41074888 | 394 | struct extent_state *state, unsigned long *bits) |
291d673e | 395 | { |
1bf85046 JM |
396 | if (tree->ops && tree->ops->set_bit_hook) |
397 | tree->ops->set_bit_hook(tree->mapping->host, state, bits); | |
291d673e CM |
398 | } |
399 | ||
400 | static void clear_state_cb(struct extent_io_tree *tree, | |
41074888 | 401 | struct extent_state *state, unsigned long *bits) |
291d673e | 402 | { |
9ed74f2d JB |
403 | if (tree->ops && tree->ops->clear_bit_hook) |
404 | tree->ops->clear_bit_hook(tree->mapping->host, state, bits); | |
291d673e CM |
405 | } |
406 | ||
3150b699 | 407 | static void set_state_bits(struct extent_io_tree *tree, |
41074888 | 408 | struct extent_state *state, unsigned long *bits); |
3150b699 | 409 | |
d1310b2e CM |
410 | /* |
411 | * insert an extent_state struct into the tree. 'bits' are set on the | |
412 | * struct before it is inserted. | |
413 | * | |
414 | * This may return -EEXIST if the extent is already there, in which case the | |
415 | * state struct is freed. | |
416 | * | |
417 | * The tree lock is not taken internally. This is a utility function and | |
418 | * probably isn't what you want to call (see set/clear_extent_bit). | |
419 | */ | |
420 | static int insert_state(struct extent_io_tree *tree, | |
421 | struct extent_state *state, u64 start, u64 end, | |
12cfbad9 FDBM |
422 | struct rb_node ***p, |
423 | struct rb_node **parent, | |
41074888 | 424 | unsigned long *bits) |
d1310b2e CM |
425 | { |
426 | struct rb_node *node; | |
427 | ||
31b1a2bd | 428 | if (end < start) |
efe120a0 | 429 | WARN(1, KERN_ERR "BTRFS: end < start %llu %llu\n", |
c1c9ff7c | 430 | end, start); |
d1310b2e CM |
431 | state->start = start; |
432 | state->end = end; | |
9ed74f2d | 433 | |
3150b699 XG |
434 | set_state_bits(tree, state, bits); |
435 | ||
f2071b21 | 436 | node = tree_insert(&tree->state, NULL, end, &state->rb_node, p, parent); |
d1310b2e CM |
437 | if (node) { |
438 | struct extent_state *found; | |
439 | found = rb_entry(node, struct extent_state, rb_node); | |
efe120a0 | 440 | printk(KERN_ERR "BTRFS: found node %llu %llu on insert of " |
c1c9ff7c GU |
441 | "%llu %llu\n", |
442 | found->start, found->end, start, end); | |
d1310b2e CM |
443 | return -EEXIST; |
444 | } | |
70dec807 | 445 | state->tree = tree; |
d1310b2e CM |
446 | merge_state(tree, state); |
447 | return 0; | |
448 | } | |
449 | ||
1bf85046 | 450 | static void split_cb(struct extent_io_tree *tree, struct extent_state *orig, |
9ed74f2d JB |
451 | u64 split) |
452 | { | |
453 | if (tree->ops && tree->ops->split_extent_hook) | |
1bf85046 | 454 | tree->ops->split_extent_hook(tree->mapping->host, orig, split); |
9ed74f2d JB |
455 | } |
456 | ||
d1310b2e CM |
457 | /* |
458 | * split a given extent state struct in two, inserting the preallocated | |
459 | * struct 'prealloc' as the newly created second half. 'split' indicates an | |
460 | * offset inside 'orig' where it should be split. | |
461 | * | |
462 | * Before calling, | |
463 | * the tree has 'orig' at [orig->start, orig->end]. After calling, there | |
464 | * are two extent state structs in the tree: | |
465 | * prealloc: [orig->start, split - 1] | |
466 | * orig: [ split, orig->end ] | |
467 | * | |
468 | * The tree locks are not taken by this function. They need to be held | |
469 | * by the caller. | |
470 | */ | |
471 | static int split_state(struct extent_io_tree *tree, struct extent_state *orig, | |
472 | struct extent_state *prealloc, u64 split) | |
473 | { | |
474 | struct rb_node *node; | |
9ed74f2d JB |
475 | |
476 | split_cb(tree, orig, split); | |
477 | ||
d1310b2e CM |
478 | prealloc->start = orig->start; |
479 | prealloc->end = split - 1; | |
480 | prealloc->state = orig->state; | |
481 | orig->start = split; | |
482 | ||
f2071b21 FM |
483 | node = tree_insert(&tree->state, &orig->rb_node, prealloc->end, |
484 | &prealloc->rb_node, NULL, NULL); | |
d1310b2e | 485 | if (node) { |
d1310b2e CM |
486 | free_extent_state(prealloc); |
487 | return -EEXIST; | |
488 | } | |
70dec807 | 489 | prealloc->tree = tree; |
d1310b2e CM |
490 | return 0; |
491 | } | |
492 | ||
cdc6a395 LZ |
493 | static struct extent_state *next_state(struct extent_state *state) |
494 | { | |
495 | struct rb_node *next = rb_next(&state->rb_node); | |
496 | if (next) | |
497 | return rb_entry(next, struct extent_state, rb_node); | |
498 | else | |
499 | return NULL; | |
500 | } | |
501 | ||
d1310b2e CM |
502 | /* |
503 | * utility function to clear some bits in an extent state struct. | |
1b303fc0 | 504 | * it will optionally wake up any one waiting on this state (wake == 1). |
d1310b2e CM |
505 | * |
506 | * If no bits are set on the state struct after clearing things, the | |
507 | * struct is freed and removed from the tree | |
508 | */ | |
cdc6a395 LZ |
509 | static struct extent_state *clear_state_bit(struct extent_io_tree *tree, |
510 | struct extent_state *state, | |
41074888 | 511 | unsigned long *bits, int wake) |
d1310b2e | 512 | { |
cdc6a395 | 513 | struct extent_state *next; |
41074888 | 514 | unsigned long bits_to_clear = *bits & ~EXTENT_CTLBITS; |
d1310b2e | 515 | |
0ca1f7ce | 516 | if ((bits_to_clear & EXTENT_DIRTY) && (state->state & EXTENT_DIRTY)) { |
d1310b2e CM |
517 | u64 range = state->end - state->start + 1; |
518 | WARN_ON(range > tree->dirty_bytes); | |
519 | tree->dirty_bytes -= range; | |
520 | } | |
291d673e | 521 | clear_state_cb(tree, state, bits); |
32c00aff | 522 | state->state &= ~bits_to_clear; |
d1310b2e CM |
523 | if (wake) |
524 | wake_up(&state->wq); | |
0ca1f7ce | 525 | if (state->state == 0) { |
cdc6a395 | 526 | next = next_state(state); |
70dec807 | 527 | if (state->tree) { |
d1310b2e | 528 | rb_erase(&state->rb_node, &tree->state); |
70dec807 | 529 | state->tree = NULL; |
d1310b2e CM |
530 | free_extent_state(state); |
531 | } else { | |
532 | WARN_ON(1); | |
533 | } | |
534 | } else { | |
535 | merge_state(tree, state); | |
cdc6a395 | 536 | next = next_state(state); |
d1310b2e | 537 | } |
cdc6a395 | 538 | return next; |
d1310b2e CM |
539 | } |
540 | ||
8233767a XG |
541 | static struct extent_state * |
542 | alloc_extent_state_atomic(struct extent_state *prealloc) | |
543 | { | |
544 | if (!prealloc) | |
545 | prealloc = alloc_extent_state(GFP_ATOMIC); | |
546 | ||
547 | return prealloc; | |
548 | } | |
549 | ||
48a3b636 | 550 | static void extent_io_tree_panic(struct extent_io_tree *tree, int err) |
c2d904e0 JM |
551 | { |
552 | btrfs_panic(tree_fs_info(tree), err, "Locking error: " | |
553 | "Extent tree was modified by another " | |
554 | "thread while locked."); | |
555 | } | |
556 | ||
d1310b2e CM |
557 | /* |
558 | * clear some bits on a range in the tree. This may require splitting | |
559 | * or inserting elements in the tree, so the gfp mask is used to | |
560 | * indicate which allocations or sleeping are allowed. | |
561 | * | |
562 | * pass 'wake' == 1 to kick any sleepers, and 'delete' == 1 to remove | |
563 | * the given range from the tree regardless of state (ie for truncate). | |
564 | * | |
565 | * the range [start, end] is inclusive. | |
566 | * | |
6763af84 | 567 | * This takes the tree lock, and returns 0 on success and < 0 on error. |
d1310b2e CM |
568 | */ |
569 | int clear_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, | |
41074888 | 570 | unsigned long bits, int wake, int delete, |
2c64c53d CM |
571 | struct extent_state **cached_state, |
572 | gfp_t mask) | |
d1310b2e CM |
573 | { |
574 | struct extent_state *state; | |
2c64c53d | 575 | struct extent_state *cached; |
d1310b2e CM |
576 | struct extent_state *prealloc = NULL; |
577 | struct rb_node *node; | |
5c939df5 | 578 | u64 last_end; |
d1310b2e | 579 | int err; |
2ac55d41 | 580 | int clear = 0; |
d1310b2e | 581 | |
a5dee37d | 582 | btrfs_debug_check_extent_io_range(tree, start, end); |
8d599ae1 | 583 | |
7ee9e440 JB |
584 | if (bits & EXTENT_DELALLOC) |
585 | bits |= EXTENT_NORESERVE; | |
586 | ||
0ca1f7ce YZ |
587 | if (delete) |
588 | bits |= ~EXTENT_CTLBITS; | |
589 | bits |= EXTENT_FIRST_DELALLOC; | |
590 | ||
2ac55d41 JB |
591 | if (bits & (EXTENT_IOBITS | EXTENT_BOUNDARY)) |
592 | clear = 1; | |
d1310b2e CM |
593 | again: |
594 | if (!prealloc && (mask & __GFP_WAIT)) { | |
595 | prealloc = alloc_extent_state(mask); | |
596 | if (!prealloc) | |
597 | return -ENOMEM; | |
598 | } | |
599 | ||
cad321ad | 600 | spin_lock(&tree->lock); |
2c64c53d CM |
601 | if (cached_state) { |
602 | cached = *cached_state; | |
2ac55d41 JB |
603 | |
604 | if (clear) { | |
605 | *cached_state = NULL; | |
606 | cached_state = NULL; | |
607 | } | |
608 | ||
df98b6e2 JB |
609 | if (cached && cached->tree && cached->start <= start && |
610 | cached->end > start) { | |
2ac55d41 JB |
611 | if (clear) |
612 | atomic_dec(&cached->refs); | |
2c64c53d | 613 | state = cached; |
42daec29 | 614 | goto hit_next; |
2c64c53d | 615 | } |
2ac55d41 JB |
616 | if (clear) |
617 | free_extent_state(cached); | |
2c64c53d | 618 | } |
d1310b2e CM |
619 | /* |
620 | * this search will find the extents that end after | |
621 | * our range starts | |
622 | */ | |
80ea96b1 | 623 | node = tree_search(tree, start); |
d1310b2e CM |
624 | if (!node) |
625 | goto out; | |
626 | state = rb_entry(node, struct extent_state, rb_node); | |
2c64c53d | 627 | hit_next: |
d1310b2e CM |
628 | if (state->start > end) |
629 | goto out; | |
630 | WARN_ON(state->end < start); | |
5c939df5 | 631 | last_end = state->end; |
d1310b2e | 632 | |
0449314a | 633 | /* the state doesn't have the wanted bits, go ahead */ |
cdc6a395 LZ |
634 | if (!(state->state & bits)) { |
635 | state = next_state(state); | |
0449314a | 636 | goto next; |
cdc6a395 | 637 | } |
0449314a | 638 | |
d1310b2e CM |
639 | /* |
640 | * | ---- desired range ---- | | |
641 | * | state | or | |
642 | * | ------------- state -------------- | | |
643 | * | |
644 | * We need to split the extent we found, and may flip | |
645 | * bits on second half. | |
646 | * | |
647 | * If the extent we found extends past our range, we | |
648 | * just split and search again. It'll get split again | |
649 | * the next time though. | |
650 | * | |
651 | * If the extent we found is inside our range, we clear | |
652 | * the desired bit on it. | |
653 | */ | |
654 | ||
655 | if (state->start < start) { | |
8233767a XG |
656 | prealloc = alloc_extent_state_atomic(prealloc); |
657 | BUG_ON(!prealloc); | |
d1310b2e | 658 | err = split_state(tree, state, prealloc, start); |
c2d904e0 JM |
659 | if (err) |
660 | extent_io_tree_panic(tree, err); | |
661 | ||
d1310b2e CM |
662 | prealloc = NULL; |
663 | if (err) | |
664 | goto out; | |
665 | if (state->end <= end) { | |
d1ac6e41 LB |
666 | state = clear_state_bit(tree, state, &bits, wake); |
667 | goto next; | |
d1310b2e CM |
668 | } |
669 | goto search_again; | |
670 | } | |
671 | /* | |
672 | * | ---- desired range ---- | | |
673 | * | state | | |
674 | * We need to split the extent, and clear the bit | |
675 | * on the first half | |
676 | */ | |
677 | if (state->start <= end && state->end > end) { | |
8233767a XG |
678 | prealloc = alloc_extent_state_atomic(prealloc); |
679 | BUG_ON(!prealloc); | |
d1310b2e | 680 | err = split_state(tree, state, prealloc, end + 1); |
c2d904e0 JM |
681 | if (err) |
682 | extent_io_tree_panic(tree, err); | |
683 | ||
d1310b2e CM |
684 | if (wake) |
685 | wake_up(&state->wq); | |
42daec29 | 686 | |
6763af84 | 687 | clear_state_bit(tree, prealloc, &bits, wake); |
9ed74f2d | 688 | |
d1310b2e CM |
689 | prealloc = NULL; |
690 | goto out; | |
691 | } | |
42daec29 | 692 | |
cdc6a395 | 693 | state = clear_state_bit(tree, state, &bits, wake); |
0449314a | 694 | next: |
5c939df5 YZ |
695 | if (last_end == (u64)-1) |
696 | goto out; | |
697 | start = last_end + 1; | |
cdc6a395 | 698 | if (start <= end && state && !need_resched()) |
692e5759 | 699 | goto hit_next; |
d1310b2e CM |
700 | goto search_again; |
701 | ||
702 | out: | |
cad321ad | 703 | spin_unlock(&tree->lock); |
d1310b2e CM |
704 | if (prealloc) |
705 | free_extent_state(prealloc); | |
706 | ||
6763af84 | 707 | return 0; |
d1310b2e CM |
708 | |
709 | search_again: | |
710 | if (start > end) | |
711 | goto out; | |
cad321ad | 712 | spin_unlock(&tree->lock); |
d1310b2e CM |
713 | if (mask & __GFP_WAIT) |
714 | cond_resched(); | |
715 | goto again; | |
716 | } | |
d1310b2e | 717 | |
143bede5 JM |
718 | static void wait_on_state(struct extent_io_tree *tree, |
719 | struct extent_state *state) | |
641f5219 CH |
720 | __releases(tree->lock) |
721 | __acquires(tree->lock) | |
d1310b2e CM |
722 | { |
723 | DEFINE_WAIT(wait); | |
724 | prepare_to_wait(&state->wq, &wait, TASK_UNINTERRUPTIBLE); | |
cad321ad | 725 | spin_unlock(&tree->lock); |
d1310b2e | 726 | schedule(); |
cad321ad | 727 | spin_lock(&tree->lock); |
d1310b2e | 728 | finish_wait(&state->wq, &wait); |
d1310b2e CM |
729 | } |
730 | ||
731 | /* | |
732 | * waits for one or more bits to clear on a range in the state tree. | |
733 | * The range [start, end] is inclusive. | |
734 | * The tree lock is taken by this function | |
735 | */ | |
41074888 DS |
736 | static void wait_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, |
737 | unsigned long bits) | |
d1310b2e CM |
738 | { |
739 | struct extent_state *state; | |
740 | struct rb_node *node; | |
741 | ||
a5dee37d | 742 | btrfs_debug_check_extent_io_range(tree, start, end); |
8d599ae1 | 743 | |
cad321ad | 744 | spin_lock(&tree->lock); |
d1310b2e CM |
745 | again: |
746 | while (1) { | |
747 | /* | |
748 | * this search will find all the extents that end after | |
749 | * our range starts | |
750 | */ | |
80ea96b1 | 751 | node = tree_search(tree, start); |
c50d3e71 | 752 | process_node: |
d1310b2e CM |
753 | if (!node) |
754 | break; | |
755 | ||
756 | state = rb_entry(node, struct extent_state, rb_node); | |
757 | ||
758 | if (state->start > end) | |
759 | goto out; | |
760 | ||
761 | if (state->state & bits) { | |
762 | start = state->start; | |
763 | atomic_inc(&state->refs); | |
764 | wait_on_state(tree, state); | |
765 | free_extent_state(state); | |
766 | goto again; | |
767 | } | |
768 | start = state->end + 1; | |
769 | ||
770 | if (start > end) | |
771 | break; | |
772 | ||
c50d3e71 FM |
773 | if (!cond_resched_lock(&tree->lock)) { |
774 | node = rb_next(node); | |
775 | goto process_node; | |
776 | } | |
d1310b2e CM |
777 | } |
778 | out: | |
cad321ad | 779 | spin_unlock(&tree->lock); |
d1310b2e | 780 | } |
d1310b2e | 781 | |
1bf85046 | 782 | static void set_state_bits(struct extent_io_tree *tree, |
d1310b2e | 783 | struct extent_state *state, |
41074888 | 784 | unsigned long *bits) |
d1310b2e | 785 | { |
41074888 | 786 | unsigned long bits_to_set = *bits & ~EXTENT_CTLBITS; |
9ed74f2d | 787 | |
1bf85046 | 788 | set_state_cb(tree, state, bits); |
0ca1f7ce | 789 | if ((bits_to_set & EXTENT_DIRTY) && !(state->state & EXTENT_DIRTY)) { |
d1310b2e CM |
790 | u64 range = state->end - state->start + 1; |
791 | tree->dirty_bytes += range; | |
792 | } | |
0ca1f7ce | 793 | state->state |= bits_to_set; |
d1310b2e CM |
794 | } |
795 | ||
2c64c53d CM |
796 | static void cache_state(struct extent_state *state, |
797 | struct extent_state **cached_ptr) | |
798 | { | |
799 | if (cached_ptr && !(*cached_ptr)) { | |
800 | if (state->state & (EXTENT_IOBITS | EXTENT_BOUNDARY)) { | |
801 | *cached_ptr = state; | |
802 | atomic_inc(&state->refs); | |
803 | } | |
804 | } | |
805 | } | |
806 | ||
d1310b2e | 807 | /* |
1edbb734 CM |
808 | * set some bits on a range in the tree. This may require allocations or |
809 | * sleeping, so the gfp mask is used to indicate what is allowed. | |
d1310b2e | 810 | * |
1edbb734 CM |
811 | * If any of the exclusive bits are set, this will fail with -EEXIST if some |
812 | * part of the range already has the desired bits set. The start of the | |
813 | * existing range is returned in failed_start in this case. | |
d1310b2e | 814 | * |
1edbb734 | 815 | * [start, end] is inclusive This takes the tree lock. |
d1310b2e | 816 | */ |
1edbb734 | 817 | |
3fbe5c02 JM |
818 | static int __must_check |
819 | __set_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, | |
41074888 DS |
820 | unsigned long bits, unsigned long exclusive_bits, |
821 | u64 *failed_start, struct extent_state **cached_state, | |
822 | gfp_t mask) | |
d1310b2e CM |
823 | { |
824 | struct extent_state *state; | |
825 | struct extent_state *prealloc = NULL; | |
826 | struct rb_node *node; | |
12cfbad9 FDBM |
827 | struct rb_node **p; |
828 | struct rb_node *parent; | |
d1310b2e | 829 | int err = 0; |
d1310b2e CM |
830 | u64 last_start; |
831 | u64 last_end; | |
42daec29 | 832 | |
a5dee37d | 833 | btrfs_debug_check_extent_io_range(tree, start, end); |
8d599ae1 | 834 | |
0ca1f7ce | 835 | bits |= EXTENT_FIRST_DELALLOC; |
d1310b2e CM |
836 | again: |
837 | if (!prealloc && (mask & __GFP_WAIT)) { | |
838 | prealloc = alloc_extent_state(mask); | |
8233767a | 839 | BUG_ON(!prealloc); |
d1310b2e CM |
840 | } |
841 | ||
cad321ad | 842 | spin_lock(&tree->lock); |
9655d298 CM |
843 | if (cached_state && *cached_state) { |
844 | state = *cached_state; | |
df98b6e2 JB |
845 | if (state->start <= start && state->end > start && |
846 | state->tree) { | |
9655d298 CM |
847 | node = &state->rb_node; |
848 | goto hit_next; | |
849 | } | |
850 | } | |
d1310b2e CM |
851 | /* |
852 | * this search will find all the extents that end after | |
853 | * our range starts. | |
854 | */ | |
12cfbad9 | 855 | node = tree_search_for_insert(tree, start, &p, &parent); |
d1310b2e | 856 | if (!node) { |
8233767a XG |
857 | prealloc = alloc_extent_state_atomic(prealloc); |
858 | BUG_ON(!prealloc); | |
12cfbad9 FDBM |
859 | err = insert_state(tree, prealloc, start, end, |
860 | &p, &parent, &bits); | |
c2d904e0 JM |
861 | if (err) |
862 | extent_io_tree_panic(tree, err); | |
863 | ||
c42ac0bc | 864 | cache_state(prealloc, cached_state); |
d1310b2e | 865 | prealloc = NULL; |
d1310b2e CM |
866 | goto out; |
867 | } | |
d1310b2e | 868 | state = rb_entry(node, struct extent_state, rb_node); |
40431d6c | 869 | hit_next: |
d1310b2e CM |
870 | last_start = state->start; |
871 | last_end = state->end; | |
872 | ||
873 | /* | |
874 | * | ---- desired range ---- | | |
875 | * | state | | |
876 | * | |
877 | * Just lock what we found and keep going | |
878 | */ | |
879 | if (state->start == start && state->end <= end) { | |
1edbb734 | 880 | if (state->state & exclusive_bits) { |
d1310b2e CM |
881 | *failed_start = state->start; |
882 | err = -EEXIST; | |
883 | goto out; | |
884 | } | |
42daec29 | 885 | |
1bf85046 | 886 | set_state_bits(tree, state, &bits); |
2c64c53d | 887 | cache_state(state, cached_state); |
d1310b2e | 888 | merge_state(tree, state); |
5c939df5 YZ |
889 | if (last_end == (u64)-1) |
890 | goto out; | |
891 | start = last_end + 1; | |
d1ac6e41 LB |
892 | state = next_state(state); |
893 | if (start < end && state && state->start == start && | |
894 | !need_resched()) | |
895 | goto hit_next; | |
d1310b2e CM |
896 | goto search_again; |
897 | } | |
898 | ||
899 | /* | |
900 | * | ---- desired range ---- | | |
901 | * | state | | |
902 | * or | |
903 | * | ------------- state -------------- | | |
904 | * | |
905 | * We need to split the extent we found, and may flip bits on | |
906 | * second half. | |
907 | * | |
908 | * If the extent we found extends past our | |
909 | * range, we just split and search again. It'll get split | |
910 | * again the next time though. | |
911 | * | |
912 | * If the extent we found is inside our range, we set the | |
913 | * desired bit on it. | |
914 | */ | |
915 | if (state->start < start) { | |
1edbb734 | 916 | if (state->state & exclusive_bits) { |
d1310b2e CM |
917 | *failed_start = start; |
918 | err = -EEXIST; | |
919 | goto out; | |
920 | } | |
8233767a XG |
921 | |
922 | prealloc = alloc_extent_state_atomic(prealloc); | |
923 | BUG_ON(!prealloc); | |
d1310b2e | 924 | err = split_state(tree, state, prealloc, start); |
c2d904e0 JM |
925 | if (err) |
926 | extent_io_tree_panic(tree, err); | |
927 | ||
d1310b2e CM |
928 | prealloc = NULL; |
929 | if (err) | |
930 | goto out; | |
931 | if (state->end <= end) { | |
1bf85046 | 932 | set_state_bits(tree, state, &bits); |
2c64c53d | 933 | cache_state(state, cached_state); |
d1310b2e | 934 | merge_state(tree, state); |
5c939df5 YZ |
935 | if (last_end == (u64)-1) |
936 | goto out; | |
937 | start = last_end + 1; | |
d1ac6e41 LB |
938 | state = next_state(state); |
939 | if (start < end && state && state->start == start && | |
940 | !need_resched()) | |
941 | goto hit_next; | |
d1310b2e CM |
942 | } |
943 | goto search_again; | |
944 | } | |
945 | /* | |
946 | * | ---- desired range ---- | | |
947 | * | state | or | state | | |
948 | * | |
949 | * There's a hole, we need to insert something in it and | |
950 | * ignore the extent we found. | |
951 | */ | |
952 | if (state->start > start) { | |
953 | u64 this_end; | |
954 | if (end < last_start) | |
955 | this_end = end; | |
956 | else | |
d397712b | 957 | this_end = last_start - 1; |
8233767a XG |
958 | |
959 | prealloc = alloc_extent_state_atomic(prealloc); | |
960 | BUG_ON(!prealloc); | |
c7f895a2 XG |
961 | |
962 | /* | |
963 | * Avoid to free 'prealloc' if it can be merged with | |
964 | * the later extent. | |
965 | */ | |
d1310b2e | 966 | err = insert_state(tree, prealloc, start, this_end, |
12cfbad9 | 967 | NULL, NULL, &bits); |
c2d904e0 JM |
968 | if (err) |
969 | extent_io_tree_panic(tree, err); | |
970 | ||
9ed74f2d JB |
971 | cache_state(prealloc, cached_state); |
972 | prealloc = NULL; | |
d1310b2e CM |
973 | start = this_end + 1; |
974 | goto search_again; | |
975 | } | |
976 | /* | |
977 | * | ---- desired range ---- | | |
978 | * | state | | |
979 | * We need to split the extent, and set the bit | |
980 | * on the first half | |
981 | */ | |
982 | if (state->start <= end && state->end > end) { | |
1edbb734 | 983 | if (state->state & exclusive_bits) { |
d1310b2e CM |
984 | *failed_start = start; |
985 | err = -EEXIST; | |
986 | goto out; | |
987 | } | |
8233767a XG |
988 | |
989 | prealloc = alloc_extent_state_atomic(prealloc); | |
990 | BUG_ON(!prealloc); | |
d1310b2e | 991 | err = split_state(tree, state, prealloc, end + 1); |
c2d904e0 JM |
992 | if (err) |
993 | extent_io_tree_panic(tree, err); | |
d1310b2e | 994 | |
1bf85046 | 995 | set_state_bits(tree, prealloc, &bits); |
2c64c53d | 996 | cache_state(prealloc, cached_state); |
d1310b2e CM |
997 | merge_state(tree, prealloc); |
998 | prealloc = NULL; | |
999 | goto out; | |
1000 | } | |
1001 | ||
1002 | goto search_again; | |
1003 | ||
1004 | out: | |
cad321ad | 1005 | spin_unlock(&tree->lock); |
d1310b2e CM |
1006 | if (prealloc) |
1007 | free_extent_state(prealloc); | |
1008 | ||
1009 | return err; | |
1010 | ||
1011 | search_again: | |
1012 | if (start > end) | |
1013 | goto out; | |
cad321ad | 1014 | spin_unlock(&tree->lock); |
d1310b2e CM |
1015 | if (mask & __GFP_WAIT) |
1016 | cond_resched(); | |
1017 | goto again; | |
1018 | } | |
d1310b2e | 1019 | |
41074888 DS |
1020 | int set_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, |
1021 | unsigned long bits, u64 * failed_start, | |
1022 | struct extent_state **cached_state, gfp_t mask) | |
3fbe5c02 JM |
1023 | { |
1024 | return __set_extent_bit(tree, start, end, bits, 0, failed_start, | |
1025 | cached_state, mask); | |
1026 | } | |
1027 | ||
1028 | ||
462d6fac | 1029 | /** |
10983f2e LB |
1030 | * convert_extent_bit - convert all bits in a given range from one bit to |
1031 | * another | |
462d6fac JB |
1032 | * @tree: the io tree to search |
1033 | * @start: the start offset in bytes | |
1034 | * @end: the end offset in bytes (inclusive) | |
1035 | * @bits: the bits to set in this range | |
1036 | * @clear_bits: the bits to clear in this range | |
e6138876 | 1037 | * @cached_state: state that we're going to cache |
462d6fac JB |
1038 | * @mask: the allocation mask |
1039 | * | |
1040 | * This will go through and set bits for the given range. If any states exist | |
1041 | * already in this range they are set with the given bit and cleared of the | |
1042 | * clear_bits. This is only meant to be used by things that are mergeable, ie | |
1043 | * converting from say DELALLOC to DIRTY. This is not meant to be used with | |
1044 | * boundary bits like LOCK. | |
1045 | */ | |
1046 | int convert_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, | |
41074888 | 1047 | unsigned long bits, unsigned long clear_bits, |
e6138876 | 1048 | struct extent_state **cached_state, gfp_t mask) |
462d6fac JB |
1049 | { |
1050 | struct extent_state *state; | |
1051 | struct extent_state *prealloc = NULL; | |
1052 | struct rb_node *node; | |
12cfbad9 FDBM |
1053 | struct rb_node **p; |
1054 | struct rb_node *parent; | |
462d6fac JB |
1055 | int err = 0; |
1056 | u64 last_start; | |
1057 | u64 last_end; | |
1058 | ||
a5dee37d | 1059 | btrfs_debug_check_extent_io_range(tree, start, end); |
8d599ae1 | 1060 | |
462d6fac JB |
1061 | again: |
1062 | if (!prealloc && (mask & __GFP_WAIT)) { | |
1063 | prealloc = alloc_extent_state(mask); | |
1064 | if (!prealloc) | |
1065 | return -ENOMEM; | |
1066 | } | |
1067 | ||
1068 | spin_lock(&tree->lock); | |
e6138876 JB |
1069 | if (cached_state && *cached_state) { |
1070 | state = *cached_state; | |
1071 | if (state->start <= start && state->end > start && | |
1072 | state->tree) { | |
1073 | node = &state->rb_node; | |
1074 | goto hit_next; | |
1075 | } | |
1076 | } | |
1077 | ||
462d6fac JB |
1078 | /* |
1079 | * this search will find all the extents that end after | |
1080 | * our range starts. | |
1081 | */ | |
12cfbad9 | 1082 | node = tree_search_for_insert(tree, start, &p, &parent); |
462d6fac JB |
1083 | if (!node) { |
1084 | prealloc = alloc_extent_state_atomic(prealloc); | |
1cf4ffdb LB |
1085 | if (!prealloc) { |
1086 | err = -ENOMEM; | |
1087 | goto out; | |
1088 | } | |
12cfbad9 FDBM |
1089 | err = insert_state(tree, prealloc, start, end, |
1090 | &p, &parent, &bits); | |
c2d904e0 JM |
1091 | if (err) |
1092 | extent_io_tree_panic(tree, err); | |
c42ac0bc FDBM |
1093 | cache_state(prealloc, cached_state); |
1094 | prealloc = NULL; | |
462d6fac JB |
1095 | goto out; |
1096 | } | |
1097 | state = rb_entry(node, struct extent_state, rb_node); | |
1098 | hit_next: | |
1099 | last_start = state->start; | |
1100 | last_end = state->end; | |
1101 | ||
1102 | /* | |
1103 | * | ---- desired range ---- | | |
1104 | * | state | | |
1105 | * | |
1106 | * Just lock what we found and keep going | |
1107 | */ | |
1108 | if (state->start == start && state->end <= end) { | |
462d6fac | 1109 | set_state_bits(tree, state, &bits); |
e6138876 | 1110 | cache_state(state, cached_state); |
d1ac6e41 | 1111 | state = clear_state_bit(tree, state, &clear_bits, 0); |
462d6fac JB |
1112 | if (last_end == (u64)-1) |
1113 | goto out; | |
462d6fac | 1114 | start = last_end + 1; |
d1ac6e41 LB |
1115 | if (start < end && state && state->start == start && |
1116 | !need_resched()) | |
1117 | goto hit_next; | |
462d6fac JB |
1118 | goto search_again; |
1119 | } | |
1120 | ||
1121 | /* | |
1122 | * | ---- desired range ---- | | |
1123 | * | state | | |
1124 | * or | |
1125 | * | ------------- state -------------- | | |
1126 | * | |
1127 | * We need to split the extent we found, and may flip bits on | |
1128 | * second half. | |
1129 | * | |
1130 | * If the extent we found extends past our | |
1131 | * range, we just split and search again. It'll get split | |
1132 | * again the next time though. | |
1133 | * | |
1134 | * If the extent we found is inside our range, we set the | |
1135 | * desired bit on it. | |
1136 | */ | |
1137 | if (state->start < start) { | |
1138 | prealloc = alloc_extent_state_atomic(prealloc); | |
1cf4ffdb LB |
1139 | if (!prealloc) { |
1140 | err = -ENOMEM; | |
1141 | goto out; | |
1142 | } | |
462d6fac | 1143 | err = split_state(tree, state, prealloc, start); |
c2d904e0 JM |
1144 | if (err) |
1145 | extent_io_tree_panic(tree, err); | |
462d6fac JB |
1146 | prealloc = NULL; |
1147 | if (err) | |
1148 | goto out; | |
1149 | if (state->end <= end) { | |
1150 | set_state_bits(tree, state, &bits); | |
e6138876 | 1151 | cache_state(state, cached_state); |
d1ac6e41 | 1152 | state = clear_state_bit(tree, state, &clear_bits, 0); |
462d6fac JB |
1153 | if (last_end == (u64)-1) |
1154 | goto out; | |
1155 | start = last_end + 1; | |
d1ac6e41 LB |
1156 | if (start < end && state && state->start == start && |
1157 | !need_resched()) | |
1158 | goto hit_next; | |
462d6fac JB |
1159 | } |
1160 | goto search_again; | |
1161 | } | |
1162 | /* | |
1163 | * | ---- desired range ---- | | |
1164 | * | state | or | state | | |
1165 | * | |
1166 | * There's a hole, we need to insert something in it and | |
1167 | * ignore the extent we found. | |
1168 | */ | |
1169 | if (state->start > start) { | |
1170 | u64 this_end; | |
1171 | if (end < last_start) | |
1172 | this_end = end; | |
1173 | else | |
1174 | this_end = last_start - 1; | |
1175 | ||
1176 | prealloc = alloc_extent_state_atomic(prealloc); | |
1cf4ffdb LB |
1177 | if (!prealloc) { |
1178 | err = -ENOMEM; | |
1179 | goto out; | |
1180 | } | |
462d6fac JB |
1181 | |
1182 | /* | |
1183 | * Avoid to free 'prealloc' if it can be merged with | |
1184 | * the later extent. | |
1185 | */ | |
1186 | err = insert_state(tree, prealloc, start, this_end, | |
12cfbad9 | 1187 | NULL, NULL, &bits); |
c2d904e0 JM |
1188 | if (err) |
1189 | extent_io_tree_panic(tree, err); | |
e6138876 | 1190 | cache_state(prealloc, cached_state); |
462d6fac JB |
1191 | prealloc = NULL; |
1192 | start = this_end + 1; | |
1193 | goto search_again; | |
1194 | } | |
1195 | /* | |
1196 | * | ---- desired range ---- | | |
1197 | * | state | | |
1198 | * We need to split the extent, and set the bit | |
1199 | * on the first half | |
1200 | */ | |
1201 | if (state->start <= end && state->end > end) { | |
1202 | prealloc = alloc_extent_state_atomic(prealloc); | |
1cf4ffdb LB |
1203 | if (!prealloc) { |
1204 | err = -ENOMEM; | |
1205 | goto out; | |
1206 | } | |
462d6fac JB |
1207 | |
1208 | err = split_state(tree, state, prealloc, end + 1); | |
c2d904e0 JM |
1209 | if (err) |
1210 | extent_io_tree_panic(tree, err); | |
462d6fac JB |
1211 | |
1212 | set_state_bits(tree, prealloc, &bits); | |
e6138876 | 1213 | cache_state(prealloc, cached_state); |
462d6fac | 1214 | clear_state_bit(tree, prealloc, &clear_bits, 0); |
462d6fac JB |
1215 | prealloc = NULL; |
1216 | goto out; | |
1217 | } | |
1218 | ||
1219 | goto search_again; | |
1220 | ||
1221 | out: | |
1222 | spin_unlock(&tree->lock); | |
1223 | if (prealloc) | |
1224 | free_extent_state(prealloc); | |
1225 | ||
1226 | return err; | |
1227 | ||
1228 | search_again: | |
1229 | if (start > end) | |
1230 | goto out; | |
1231 | spin_unlock(&tree->lock); | |
1232 | if (mask & __GFP_WAIT) | |
1233 | cond_resched(); | |
1234 | goto again; | |
1235 | } | |
1236 | ||
d1310b2e CM |
1237 | /* wrappers around set/clear extent bit */ |
1238 | int set_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end, | |
1239 | gfp_t mask) | |
1240 | { | |
3fbe5c02 | 1241 | return set_extent_bit(tree, start, end, EXTENT_DIRTY, NULL, |
2c64c53d | 1242 | NULL, mask); |
d1310b2e | 1243 | } |
d1310b2e CM |
1244 | |
1245 | int set_extent_bits(struct extent_io_tree *tree, u64 start, u64 end, | |
41074888 | 1246 | unsigned long bits, gfp_t mask) |
d1310b2e | 1247 | { |
3fbe5c02 | 1248 | return set_extent_bit(tree, start, end, bits, NULL, |
2c64c53d | 1249 | NULL, mask); |
d1310b2e | 1250 | } |
d1310b2e CM |
1251 | |
1252 | int clear_extent_bits(struct extent_io_tree *tree, u64 start, u64 end, | |
41074888 | 1253 | unsigned long bits, gfp_t mask) |
d1310b2e | 1254 | { |
2c64c53d | 1255 | return clear_extent_bit(tree, start, end, bits, 0, 0, NULL, mask); |
d1310b2e | 1256 | } |
d1310b2e CM |
1257 | |
1258 | int set_extent_delalloc(struct extent_io_tree *tree, u64 start, u64 end, | |
2ac55d41 | 1259 | struct extent_state **cached_state, gfp_t mask) |
d1310b2e CM |
1260 | { |
1261 | return set_extent_bit(tree, start, end, | |
fee187d9 | 1262 | EXTENT_DELALLOC | EXTENT_UPTODATE, |
3fbe5c02 | 1263 | NULL, cached_state, mask); |
d1310b2e | 1264 | } |
d1310b2e | 1265 | |
9e8a4a8b LB |
1266 | int set_extent_defrag(struct extent_io_tree *tree, u64 start, u64 end, |
1267 | struct extent_state **cached_state, gfp_t mask) | |
1268 | { | |
1269 | return set_extent_bit(tree, start, end, | |
1270 | EXTENT_DELALLOC | EXTENT_UPTODATE | EXTENT_DEFRAG, | |
1271 | NULL, cached_state, mask); | |
1272 | } | |
1273 | ||
d1310b2e CM |
1274 | int clear_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end, |
1275 | gfp_t mask) | |
1276 | { | |
1277 | return clear_extent_bit(tree, start, end, | |
32c00aff | 1278 | EXTENT_DIRTY | EXTENT_DELALLOC | |
0ca1f7ce | 1279 | EXTENT_DO_ACCOUNTING, 0, 0, NULL, mask); |
d1310b2e | 1280 | } |
d1310b2e CM |
1281 | |
1282 | int set_extent_new(struct extent_io_tree *tree, u64 start, u64 end, | |
1283 | gfp_t mask) | |
1284 | { | |
3fbe5c02 | 1285 | return set_extent_bit(tree, start, end, EXTENT_NEW, NULL, |
2c64c53d | 1286 | NULL, mask); |
d1310b2e | 1287 | } |
d1310b2e | 1288 | |
d1310b2e | 1289 | int set_extent_uptodate(struct extent_io_tree *tree, u64 start, u64 end, |
507903b8 | 1290 | struct extent_state **cached_state, gfp_t mask) |
d1310b2e | 1291 | { |
6b67a320 | 1292 | return set_extent_bit(tree, start, end, EXTENT_UPTODATE, NULL, |
3fbe5c02 | 1293 | cached_state, mask); |
d1310b2e | 1294 | } |
d1310b2e | 1295 | |
5fd02043 JB |
1296 | int clear_extent_uptodate(struct extent_io_tree *tree, u64 start, u64 end, |
1297 | struct extent_state **cached_state, gfp_t mask) | |
d1310b2e | 1298 | { |
2c64c53d | 1299 | return clear_extent_bit(tree, start, end, EXTENT_UPTODATE, 0, 0, |
2ac55d41 | 1300 | cached_state, mask); |
d1310b2e | 1301 | } |
d1310b2e | 1302 | |
d352ac68 CM |
1303 | /* |
1304 | * either insert or lock state struct between start and end use mask to tell | |
1305 | * us if waiting is desired. | |
1306 | */ | |
1edbb734 | 1307 | int lock_extent_bits(struct extent_io_tree *tree, u64 start, u64 end, |
41074888 | 1308 | unsigned long bits, struct extent_state **cached_state) |
d1310b2e CM |
1309 | { |
1310 | int err; | |
1311 | u64 failed_start; | |
1312 | while (1) { | |
3fbe5c02 JM |
1313 | err = __set_extent_bit(tree, start, end, EXTENT_LOCKED | bits, |
1314 | EXTENT_LOCKED, &failed_start, | |
1315 | cached_state, GFP_NOFS); | |
d0082371 | 1316 | if (err == -EEXIST) { |
d1310b2e CM |
1317 | wait_extent_bit(tree, failed_start, end, EXTENT_LOCKED); |
1318 | start = failed_start; | |
d0082371 | 1319 | } else |
d1310b2e | 1320 | break; |
d1310b2e CM |
1321 | WARN_ON(start > end); |
1322 | } | |
1323 | return err; | |
1324 | } | |
d1310b2e | 1325 | |
d0082371 | 1326 | int lock_extent(struct extent_io_tree *tree, u64 start, u64 end) |
1edbb734 | 1327 | { |
d0082371 | 1328 | return lock_extent_bits(tree, start, end, 0, NULL); |
1edbb734 CM |
1329 | } |
1330 | ||
d0082371 | 1331 | int try_lock_extent(struct extent_io_tree *tree, u64 start, u64 end) |
25179201 JB |
1332 | { |
1333 | int err; | |
1334 | u64 failed_start; | |
1335 | ||
3fbe5c02 JM |
1336 | err = __set_extent_bit(tree, start, end, EXTENT_LOCKED, EXTENT_LOCKED, |
1337 | &failed_start, NULL, GFP_NOFS); | |
6643558d YZ |
1338 | if (err == -EEXIST) { |
1339 | if (failed_start > start) | |
1340 | clear_extent_bit(tree, start, failed_start - 1, | |
d0082371 | 1341 | EXTENT_LOCKED, 1, 0, NULL, GFP_NOFS); |
25179201 | 1342 | return 0; |
6643558d | 1343 | } |
25179201 JB |
1344 | return 1; |
1345 | } | |
25179201 | 1346 | |
2c64c53d CM |
1347 | int unlock_extent_cached(struct extent_io_tree *tree, u64 start, u64 end, |
1348 | struct extent_state **cached, gfp_t mask) | |
1349 | { | |
1350 | return clear_extent_bit(tree, start, end, EXTENT_LOCKED, 1, 0, cached, | |
1351 | mask); | |
1352 | } | |
1353 | ||
d0082371 | 1354 | int unlock_extent(struct extent_io_tree *tree, u64 start, u64 end) |
d1310b2e | 1355 | { |
2c64c53d | 1356 | return clear_extent_bit(tree, start, end, EXTENT_LOCKED, 1, 0, NULL, |
d0082371 | 1357 | GFP_NOFS); |
d1310b2e | 1358 | } |
d1310b2e | 1359 | |
4adaa611 CM |
1360 | int extent_range_clear_dirty_for_io(struct inode *inode, u64 start, u64 end) |
1361 | { | |
1362 | unsigned long index = start >> PAGE_CACHE_SHIFT; | |
1363 | unsigned long end_index = end >> PAGE_CACHE_SHIFT; | |
1364 | struct page *page; | |
1365 | ||
1366 | while (index <= end_index) { | |
1367 | page = find_get_page(inode->i_mapping, index); | |
1368 | BUG_ON(!page); /* Pages should be in the extent_io_tree */ | |
1369 | clear_page_dirty_for_io(page); | |
1370 | page_cache_release(page); | |
1371 | index++; | |
1372 | } | |
1373 | return 0; | |
1374 | } | |
1375 | ||
1376 | int extent_range_redirty_for_io(struct inode *inode, u64 start, u64 end) | |
1377 | { | |
1378 | unsigned long index = start >> PAGE_CACHE_SHIFT; | |
1379 | unsigned long end_index = end >> PAGE_CACHE_SHIFT; | |
1380 | struct page *page; | |
1381 | ||
1382 | while (index <= end_index) { | |
1383 | page = find_get_page(inode->i_mapping, index); | |
1384 | BUG_ON(!page); /* Pages should be in the extent_io_tree */ | |
1385 | account_page_redirty(page); | |
1386 | __set_page_dirty_nobuffers(page); | |
1387 | page_cache_release(page); | |
1388 | index++; | |
1389 | } | |
1390 | return 0; | |
1391 | } | |
1392 | ||
d1310b2e CM |
1393 | /* |
1394 | * helper function to set both pages and extents in the tree writeback | |
1395 | */ | |
b2950863 | 1396 | static int set_range_writeback(struct extent_io_tree *tree, u64 start, u64 end) |
d1310b2e CM |
1397 | { |
1398 | unsigned long index = start >> PAGE_CACHE_SHIFT; | |
1399 | unsigned long end_index = end >> PAGE_CACHE_SHIFT; | |
1400 | struct page *page; | |
1401 | ||
1402 | while (index <= end_index) { | |
1403 | page = find_get_page(tree->mapping, index); | |
79787eaa | 1404 | BUG_ON(!page); /* Pages should be in the extent_io_tree */ |
d1310b2e CM |
1405 | set_page_writeback(page); |
1406 | page_cache_release(page); | |
1407 | index++; | |
1408 | } | |
d1310b2e CM |
1409 | return 0; |
1410 | } | |
d1310b2e | 1411 | |
d352ac68 CM |
1412 | /* find the first state struct with 'bits' set after 'start', and |
1413 | * return it. tree->lock must be held. NULL will returned if | |
1414 | * nothing was found after 'start' | |
1415 | */ | |
48a3b636 ES |
1416 | static struct extent_state * |
1417 | find_first_extent_bit_state(struct extent_io_tree *tree, | |
41074888 | 1418 | u64 start, unsigned long bits) |
d7fc640e CM |
1419 | { |
1420 | struct rb_node *node; | |
1421 | struct extent_state *state; | |
1422 | ||
1423 | /* | |
1424 | * this search will find all the extents that end after | |
1425 | * our range starts. | |
1426 | */ | |
1427 | node = tree_search(tree, start); | |
d397712b | 1428 | if (!node) |
d7fc640e | 1429 | goto out; |
d7fc640e | 1430 | |
d397712b | 1431 | while (1) { |
d7fc640e | 1432 | state = rb_entry(node, struct extent_state, rb_node); |
d397712b | 1433 | if (state->end >= start && (state->state & bits)) |
d7fc640e | 1434 | return state; |
d397712b | 1435 | |
d7fc640e CM |
1436 | node = rb_next(node); |
1437 | if (!node) | |
1438 | break; | |
1439 | } | |
1440 | out: | |
1441 | return NULL; | |
1442 | } | |
d7fc640e | 1443 | |
69261c4b XG |
1444 | /* |
1445 | * find the first offset in the io tree with 'bits' set. zero is | |
1446 | * returned if we find something, and *start_ret and *end_ret are | |
1447 | * set to reflect the state struct that was found. | |
1448 | * | |
477d7eaf | 1449 | * If nothing was found, 1 is returned. If found something, return 0. |
69261c4b XG |
1450 | */ |
1451 | int find_first_extent_bit(struct extent_io_tree *tree, u64 start, | |
41074888 | 1452 | u64 *start_ret, u64 *end_ret, unsigned long bits, |
e6138876 | 1453 | struct extent_state **cached_state) |
69261c4b XG |
1454 | { |
1455 | struct extent_state *state; | |
e6138876 | 1456 | struct rb_node *n; |
69261c4b XG |
1457 | int ret = 1; |
1458 | ||
1459 | spin_lock(&tree->lock); | |
e6138876 JB |
1460 | if (cached_state && *cached_state) { |
1461 | state = *cached_state; | |
1462 | if (state->end == start - 1 && state->tree) { | |
1463 | n = rb_next(&state->rb_node); | |
1464 | while (n) { | |
1465 | state = rb_entry(n, struct extent_state, | |
1466 | rb_node); | |
1467 | if (state->state & bits) | |
1468 | goto got_it; | |
1469 | n = rb_next(n); | |
1470 | } | |
1471 | free_extent_state(*cached_state); | |
1472 | *cached_state = NULL; | |
1473 | goto out; | |
1474 | } | |
1475 | free_extent_state(*cached_state); | |
1476 | *cached_state = NULL; | |
1477 | } | |
1478 | ||
69261c4b | 1479 | state = find_first_extent_bit_state(tree, start, bits); |
e6138876 | 1480 | got_it: |
69261c4b | 1481 | if (state) { |
e6138876 | 1482 | cache_state(state, cached_state); |
69261c4b XG |
1483 | *start_ret = state->start; |
1484 | *end_ret = state->end; | |
1485 | ret = 0; | |
1486 | } | |
e6138876 | 1487 | out: |
69261c4b XG |
1488 | spin_unlock(&tree->lock); |
1489 | return ret; | |
1490 | } | |
1491 | ||
d352ac68 CM |
1492 | /* |
1493 | * find a contiguous range of bytes in the file marked as delalloc, not | |
1494 | * more than 'max_bytes'. start and end are used to return the range, | |
1495 | * | |
1496 | * 1 is returned if we find something, 0 if nothing was in the tree | |
1497 | */ | |
c8b97818 | 1498 | static noinline u64 find_delalloc_range(struct extent_io_tree *tree, |
c2a128d2 JB |
1499 | u64 *start, u64 *end, u64 max_bytes, |
1500 | struct extent_state **cached_state) | |
d1310b2e CM |
1501 | { |
1502 | struct rb_node *node; | |
1503 | struct extent_state *state; | |
1504 | u64 cur_start = *start; | |
1505 | u64 found = 0; | |
1506 | u64 total_bytes = 0; | |
1507 | ||
cad321ad | 1508 | spin_lock(&tree->lock); |
c8b97818 | 1509 | |
d1310b2e CM |
1510 | /* |
1511 | * this search will find all the extents that end after | |
1512 | * our range starts. | |
1513 | */ | |
80ea96b1 | 1514 | node = tree_search(tree, cur_start); |
2b114d1d | 1515 | if (!node) { |
3b951516 CM |
1516 | if (!found) |
1517 | *end = (u64)-1; | |
d1310b2e CM |
1518 | goto out; |
1519 | } | |
1520 | ||
d397712b | 1521 | while (1) { |
d1310b2e | 1522 | state = rb_entry(node, struct extent_state, rb_node); |
5b21f2ed ZY |
1523 | if (found && (state->start != cur_start || |
1524 | (state->state & EXTENT_BOUNDARY))) { | |
d1310b2e CM |
1525 | goto out; |
1526 | } | |
1527 | if (!(state->state & EXTENT_DELALLOC)) { | |
1528 | if (!found) | |
1529 | *end = state->end; | |
1530 | goto out; | |
1531 | } | |
c2a128d2 | 1532 | if (!found) { |
d1310b2e | 1533 | *start = state->start; |
c2a128d2 JB |
1534 | *cached_state = state; |
1535 | atomic_inc(&state->refs); | |
1536 | } | |
d1310b2e CM |
1537 | found++; |
1538 | *end = state->end; | |
1539 | cur_start = state->end + 1; | |
1540 | node = rb_next(node); | |
d1310b2e | 1541 | total_bytes += state->end - state->start + 1; |
7bf811a5 | 1542 | if (total_bytes >= max_bytes) |
573aecaf | 1543 | break; |
573aecaf | 1544 | if (!node) |
d1310b2e CM |
1545 | break; |
1546 | } | |
1547 | out: | |
cad321ad | 1548 | spin_unlock(&tree->lock); |
d1310b2e CM |
1549 | return found; |
1550 | } | |
1551 | ||
143bede5 JM |
1552 | static noinline void __unlock_for_delalloc(struct inode *inode, |
1553 | struct page *locked_page, | |
1554 | u64 start, u64 end) | |
c8b97818 CM |
1555 | { |
1556 | int ret; | |
1557 | struct page *pages[16]; | |
1558 | unsigned long index = start >> PAGE_CACHE_SHIFT; | |
1559 | unsigned long end_index = end >> PAGE_CACHE_SHIFT; | |
1560 | unsigned long nr_pages = end_index - index + 1; | |
1561 | int i; | |
1562 | ||
1563 | if (index == locked_page->index && end_index == index) | |
143bede5 | 1564 | return; |
c8b97818 | 1565 | |
d397712b | 1566 | while (nr_pages > 0) { |
c8b97818 | 1567 | ret = find_get_pages_contig(inode->i_mapping, index, |
5b050f04 CM |
1568 | min_t(unsigned long, nr_pages, |
1569 | ARRAY_SIZE(pages)), pages); | |
c8b97818 CM |
1570 | for (i = 0; i < ret; i++) { |
1571 | if (pages[i] != locked_page) | |
1572 | unlock_page(pages[i]); | |
1573 | page_cache_release(pages[i]); | |
1574 | } | |
1575 | nr_pages -= ret; | |
1576 | index += ret; | |
1577 | cond_resched(); | |
1578 | } | |
c8b97818 CM |
1579 | } |
1580 | ||
1581 | static noinline int lock_delalloc_pages(struct inode *inode, | |
1582 | struct page *locked_page, | |
1583 | u64 delalloc_start, | |
1584 | u64 delalloc_end) | |
1585 | { | |
1586 | unsigned long index = delalloc_start >> PAGE_CACHE_SHIFT; | |
1587 | unsigned long start_index = index; | |
1588 | unsigned long end_index = delalloc_end >> PAGE_CACHE_SHIFT; | |
1589 | unsigned long pages_locked = 0; | |
1590 | struct page *pages[16]; | |
1591 | unsigned long nrpages; | |
1592 | int ret; | |
1593 | int i; | |
1594 | ||
1595 | /* the caller is responsible for locking the start index */ | |
1596 | if (index == locked_page->index && index == end_index) | |
1597 | return 0; | |
1598 | ||
1599 | /* skip the page at the start index */ | |
1600 | nrpages = end_index - index + 1; | |
d397712b | 1601 | while (nrpages > 0) { |
c8b97818 | 1602 | ret = find_get_pages_contig(inode->i_mapping, index, |
5b050f04 CM |
1603 | min_t(unsigned long, |
1604 | nrpages, ARRAY_SIZE(pages)), pages); | |
c8b97818 CM |
1605 | if (ret == 0) { |
1606 | ret = -EAGAIN; | |
1607 | goto done; | |
1608 | } | |
1609 | /* now we have an array of pages, lock them all */ | |
1610 | for (i = 0; i < ret; i++) { | |
1611 | /* | |
1612 | * the caller is taking responsibility for | |
1613 | * locked_page | |
1614 | */ | |
771ed689 | 1615 | if (pages[i] != locked_page) { |
c8b97818 | 1616 | lock_page(pages[i]); |
f2b1c41c CM |
1617 | if (!PageDirty(pages[i]) || |
1618 | pages[i]->mapping != inode->i_mapping) { | |
771ed689 CM |
1619 | ret = -EAGAIN; |
1620 | unlock_page(pages[i]); | |
1621 | page_cache_release(pages[i]); | |
1622 | goto done; | |
1623 | } | |
1624 | } | |
c8b97818 | 1625 | page_cache_release(pages[i]); |
771ed689 | 1626 | pages_locked++; |
c8b97818 | 1627 | } |
c8b97818 CM |
1628 | nrpages -= ret; |
1629 | index += ret; | |
1630 | cond_resched(); | |
1631 | } | |
1632 | ret = 0; | |
1633 | done: | |
1634 | if (ret && pages_locked) { | |
1635 | __unlock_for_delalloc(inode, locked_page, | |
1636 | delalloc_start, | |
1637 | ((u64)(start_index + pages_locked - 1)) << | |
1638 | PAGE_CACHE_SHIFT); | |
1639 | } | |
1640 | return ret; | |
1641 | } | |
1642 | ||
1643 | /* | |
1644 | * find a contiguous range of bytes in the file marked as delalloc, not | |
1645 | * more than 'max_bytes'. start and end are used to return the range, | |
1646 | * | |
1647 | * 1 is returned if we find something, 0 if nothing was in the tree | |
1648 | */ | |
294e30fe JB |
1649 | STATIC u64 find_lock_delalloc_range(struct inode *inode, |
1650 | struct extent_io_tree *tree, | |
1651 | struct page *locked_page, u64 *start, | |
1652 | u64 *end, u64 max_bytes) | |
c8b97818 CM |
1653 | { |
1654 | u64 delalloc_start; | |
1655 | u64 delalloc_end; | |
1656 | u64 found; | |
9655d298 | 1657 | struct extent_state *cached_state = NULL; |
c8b97818 CM |
1658 | int ret; |
1659 | int loops = 0; | |
1660 | ||
1661 | again: | |
1662 | /* step one, find a bunch of delalloc bytes starting at start */ | |
1663 | delalloc_start = *start; | |
1664 | delalloc_end = 0; | |
1665 | found = find_delalloc_range(tree, &delalloc_start, &delalloc_end, | |
c2a128d2 | 1666 | max_bytes, &cached_state); |
70b99e69 | 1667 | if (!found || delalloc_end <= *start) { |
c8b97818 CM |
1668 | *start = delalloc_start; |
1669 | *end = delalloc_end; | |
c2a128d2 | 1670 | free_extent_state(cached_state); |
385fe0be | 1671 | return 0; |
c8b97818 CM |
1672 | } |
1673 | ||
70b99e69 CM |
1674 | /* |
1675 | * start comes from the offset of locked_page. We have to lock | |
1676 | * pages in order, so we can't process delalloc bytes before | |
1677 | * locked_page | |
1678 | */ | |
d397712b | 1679 | if (delalloc_start < *start) |
70b99e69 | 1680 | delalloc_start = *start; |
70b99e69 | 1681 | |
c8b97818 CM |
1682 | /* |
1683 | * make sure to limit the number of pages we try to lock down | |
c8b97818 | 1684 | */ |
7bf811a5 JB |
1685 | if (delalloc_end + 1 - delalloc_start > max_bytes) |
1686 | delalloc_end = delalloc_start + max_bytes - 1; | |
d397712b | 1687 | |
c8b97818 CM |
1688 | /* step two, lock all the pages after the page that has start */ |
1689 | ret = lock_delalloc_pages(inode, locked_page, | |
1690 | delalloc_start, delalloc_end); | |
1691 | if (ret == -EAGAIN) { | |
1692 | /* some of the pages are gone, lets avoid looping by | |
1693 | * shortening the size of the delalloc range we're searching | |
1694 | */ | |
9655d298 | 1695 | free_extent_state(cached_state); |
c8b97818 | 1696 | if (!loops) { |
7bf811a5 | 1697 | max_bytes = PAGE_CACHE_SIZE; |
c8b97818 CM |
1698 | loops = 1; |
1699 | goto again; | |
1700 | } else { | |
1701 | found = 0; | |
1702 | goto out_failed; | |
1703 | } | |
1704 | } | |
79787eaa | 1705 | BUG_ON(ret); /* Only valid values are 0 and -EAGAIN */ |
c8b97818 CM |
1706 | |
1707 | /* step three, lock the state bits for the whole range */ | |
d0082371 | 1708 | lock_extent_bits(tree, delalloc_start, delalloc_end, 0, &cached_state); |
c8b97818 CM |
1709 | |
1710 | /* then test to make sure it is all still delalloc */ | |
1711 | ret = test_range_bit(tree, delalloc_start, delalloc_end, | |
9655d298 | 1712 | EXTENT_DELALLOC, 1, cached_state); |
c8b97818 | 1713 | if (!ret) { |
9655d298 CM |
1714 | unlock_extent_cached(tree, delalloc_start, delalloc_end, |
1715 | &cached_state, GFP_NOFS); | |
c8b97818 CM |
1716 | __unlock_for_delalloc(inode, locked_page, |
1717 | delalloc_start, delalloc_end); | |
1718 | cond_resched(); | |
1719 | goto again; | |
1720 | } | |
9655d298 | 1721 | free_extent_state(cached_state); |
c8b97818 CM |
1722 | *start = delalloc_start; |
1723 | *end = delalloc_end; | |
1724 | out_failed: | |
1725 | return found; | |
1726 | } | |
1727 | ||
c2790a2e JB |
1728 | int extent_clear_unlock_delalloc(struct inode *inode, u64 start, u64 end, |
1729 | struct page *locked_page, | |
1730 | unsigned long clear_bits, | |
1731 | unsigned long page_ops) | |
c8b97818 | 1732 | { |
c2790a2e | 1733 | struct extent_io_tree *tree = &BTRFS_I(inode)->io_tree; |
c8b97818 CM |
1734 | int ret; |
1735 | struct page *pages[16]; | |
1736 | unsigned long index = start >> PAGE_CACHE_SHIFT; | |
1737 | unsigned long end_index = end >> PAGE_CACHE_SHIFT; | |
1738 | unsigned long nr_pages = end_index - index + 1; | |
1739 | int i; | |
771ed689 | 1740 | |
2c64c53d | 1741 | clear_extent_bit(tree, start, end, clear_bits, 1, 0, NULL, GFP_NOFS); |
c2790a2e | 1742 | if (page_ops == 0) |
771ed689 | 1743 | return 0; |
c8b97818 | 1744 | |
d397712b | 1745 | while (nr_pages > 0) { |
c8b97818 | 1746 | ret = find_get_pages_contig(inode->i_mapping, index, |
5b050f04 CM |
1747 | min_t(unsigned long, |
1748 | nr_pages, ARRAY_SIZE(pages)), pages); | |
c8b97818 | 1749 | for (i = 0; i < ret; i++) { |
8b62b72b | 1750 | |
c2790a2e | 1751 | if (page_ops & PAGE_SET_PRIVATE2) |
8b62b72b CM |
1752 | SetPagePrivate2(pages[i]); |
1753 | ||
c8b97818 CM |
1754 | if (pages[i] == locked_page) { |
1755 | page_cache_release(pages[i]); | |
1756 | continue; | |
1757 | } | |
c2790a2e | 1758 | if (page_ops & PAGE_CLEAR_DIRTY) |
c8b97818 | 1759 | clear_page_dirty_for_io(pages[i]); |
c2790a2e | 1760 | if (page_ops & PAGE_SET_WRITEBACK) |
c8b97818 | 1761 | set_page_writeback(pages[i]); |
c2790a2e | 1762 | if (page_ops & PAGE_END_WRITEBACK) |
c8b97818 | 1763 | end_page_writeback(pages[i]); |
c2790a2e | 1764 | if (page_ops & PAGE_UNLOCK) |
771ed689 | 1765 | unlock_page(pages[i]); |
c8b97818 CM |
1766 | page_cache_release(pages[i]); |
1767 | } | |
1768 | nr_pages -= ret; | |
1769 | index += ret; | |
1770 | cond_resched(); | |
1771 | } | |
1772 | return 0; | |
1773 | } | |
c8b97818 | 1774 | |
d352ac68 CM |
1775 | /* |
1776 | * count the number of bytes in the tree that have a given bit(s) | |
1777 | * set. This can be fairly slow, except for EXTENT_DIRTY which is | |
1778 | * cached. The total number found is returned. | |
1779 | */ | |
d1310b2e CM |
1780 | u64 count_range_bits(struct extent_io_tree *tree, |
1781 | u64 *start, u64 search_end, u64 max_bytes, | |
ec29ed5b | 1782 | unsigned long bits, int contig) |
d1310b2e CM |
1783 | { |
1784 | struct rb_node *node; | |
1785 | struct extent_state *state; | |
1786 | u64 cur_start = *start; | |
1787 | u64 total_bytes = 0; | |
ec29ed5b | 1788 | u64 last = 0; |
d1310b2e CM |
1789 | int found = 0; |
1790 | ||
fae7f21c | 1791 | if (WARN_ON(search_end <= cur_start)) |
d1310b2e | 1792 | return 0; |
d1310b2e | 1793 | |
cad321ad | 1794 | spin_lock(&tree->lock); |
d1310b2e CM |
1795 | if (cur_start == 0 && bits == EXTENT_DIRTY) { |
1796 | total_bytes = tree->dirty_bytes; | |
1797 | goto out; | |
1798 | } | |
1799 | /* | |
1800 | * this search will find all the extents that end after | |
1801 | * our range starts. | |
1802 | */ | |
80ea96b1 | 1803 | node = tree_search(tree, cur_start); |
d397712b | 1804 | if (!node) |
d1310b2e | 1805 | goto out; |
d1310b2e | 1806 | |
d397712b | 1807 | while (1) { |
d1310b2e CM |
1808 | state = rb_entry(node, struct extent_state, rb_node); |
1809 | if (state->start > search_end) | |
1810 | break; | |
ec29ed5b CM |
1811 | if (contig && found && state->start > last + 1) |
1812 | break; | |
1813 | if (state->end >= cur_start && (state->state & bits) == bits) { | |
d1310b2e CM |
1814 | total_bytes += min(search_end, state->end) + 1 - |
1815 | max(cur_start, state->start); | |
1816 | if (total_bytes >= max_bytes) | |
1817 | break; | |
1818 | if (!found) { | |
af60bed2 | 1819 | *start = max(cur_start, state->start); |
d1310b2e CM |
1820 | found = 1; |
1821 | } | |
ec29ed5b CM |
1822 | last = state->end; |
1823 | } else if (contig && found) { | |
1824 | break; | |
d1310b2e CM |
1825 | } |
1826 | node = rb_next(node); | |
1827 | if (!node) | |
1828 | break; | |
1829 | } | |
1830 | out: | |
cad321ad | 1831 | spin_unlock(&tree->lock); |
d1310b2e CM |
1832 | return total_bytes; |
1833 | } | |
b2950863 | 1834 | |
d352ac68 CM |
1835 | /* |
1836 | * set the private field for a given byte offset in the tree. If there isn't | |
1837 | * an extent_state there already, this does nothing. | |
1838 | */ | |
171170c1 | 1839 | static int set_state_private(struct extent_io_tree *tree, u64 start, u64 private) |
d1310b2e CM |
1840 | { |
1841 | struct rb_node *node; | |
1842 | struct extent_state *state; | |
1843 | int ret = 0; | |
1844 | ||
cad321ad | 1845 | spin_lock(&tree->lock); |
d1310b2e CM |
1846 | /* |
1847 | * this search will find all the extents that end after | |
1848 | * our range starts. | |
1849 | */ | |
80ea96b1 | 1850 | node = tree_search(tree, start); |
2b114d1d | 1851 | if (!node) { |
d1310b2e CM |
1852 | ret = -ENOENT; |
1853 | goto out; | |
1854 | } | |
1855 | state = rb_entry(node, struct extent_state, rb_node); | |
1856 | if (state->start != start) { | |
1857 | ret = -ENOENT; | |
1858 | goto out; | |
1859 | } | |
1860 | state->private = private; | |
1861 | out: | |
cad321ad | 1862 | spin_unlock(&tree->lock); |
d1310b2e CM |
1863 | return ret; |
1864 | } | |
1865 | ||
1866 | int get_state_private(struct extent_io_tree *tree, u64 start, u64 *private) | |
1867 | { | |
1868 | struct rb_node *node; | |
1869 | struct extent_state *state; | |
1870 | int ret = 0; | |
1871 | ||
cad321ad | 1872 | spin_lock(&tree->lock); |
d1310b2e CM |
1873 | /* |
1874 | * this search will find all the extents that end after | |
1875 | * our range starts. | |
1876 | */ | |
80ea96b1 | 1877 | node = tree_search(tree, start); |
2b114d1d | 1878 | if (!node) { |
d1310b2e CM |
1879 | ret = -ENOENT; |
1880 | goto out; | |
1881 | } | |
1882 | state = rb_entry(node, struct extent_state, rb_node); | |
1883 | if (state->start != start) { | |
1884 | ret = -ENOENT; | |
1885 | goto out; | |
1886 | } | |
1887 | *private = state->private; | |
1888 | out: | |
cad321ad | 1889 | spin_unlock(&tree->lock); |
d1310b2e CM |
1890 | return ret; |
1891 | } | |
1892 | ||
1893 | /* | |
1894 | * searches a range in the state tree for a given mask. | |
70dec807 | 1895 | * If 'filled' == 1, this returns 1 only if every extent in the tree |
d1310b2e CM |
1896 | * has the bits set. Otherwise, 1 is returned if any bit in the |
1897 | * range is found set. | |
1898 | */ | |
1899 | int test_range_bit(struct extent_io_tree *tree, u64 start, u64 end, | |
41074888 | 1900 | unsigned long bits, int filled, struct extent_state *cached) |
d1310b2e CM |
1901 | { |
1902 | struct extent_state *state = NULL; | |
1903 | struct rb_node *node; | |
1904 | int bitset = 0; | |
d1310b2e | 1905 | |
cad321ad | 1906 | spin_lock(&tree->lock); |
df98b6e2 JB |
1907 | if (cached && cached->tree && cached->start <= start && |
1908 | cached->end > start) | |
9655d298 CM |
1909 | node = &cached->rb_node; |
1910 | else | |
1911 | node = tree_search(tree, start); | |
d1310b2e CM |
1912 | while (node && start <= end) { |
1913 | state = rb_entry(node, struct extent_state, rb_node); | |
1914 | ||
1915 | if (filled && state->start > start) { | |
1916 | bitset = 0; | |
1917 | break; | |
1918 | } | |
1919 | ||
1920 | if (state->start > end) | |
1921 | break; | |
1922 | ||
1923 | if (state->state & bits) { | |
1924 | bitset = 1; | |
1925 | if (!filled) | |
1926 | break; | |
1927 | } else if (filled) { | |
1928 | bitset = 0; | |
1929 | break; | |
1930 | } | |
46562cec CM |
1931 | |
1932 | if (state->end == (u64)-1) | |
1933 | break; | |
1934 | ||
d1310b2e CM |
1935 | start = state->end + 1; |
1936 | if (start > end) | |
1937 | break; | |
1938 | node = rb_next(node); | |
1939 | if (!node) { | |
1940 | if (filled) | |
1941 | bitset = 0; | |
1942 | break; | |
1943 | } | |
1944 | } | |
cad321ad | 1945 | spin_unlock(&tree->lock); |
d1310b2e CM |
1946 | return bitset; |
1947 | } | |
d1310b2e CM |
1948 | |
1949 | /* | |
1950 | * helper function to set a given page up to date if all the | |
1951 | * extents in the tree for that page are up to date | |
1952 | */ | |
143bede5 | 1953 | static void check_page_uptodate(struct extent_io_tree *tree, struct page *page) |
d1310b2e | 1954 | { |
4eee4fa4 | 1955 | u64 start = page_offset(page); |
d1310b2e | 1956 | u64 end = start + PAGE_CACHE_SIZE - 1; |
9655d298 | 1957 | if (test_range_bit(tree, start, end, EXTENT_UPTODATE, 1, NULL)) |
d1310b2e | 1958 | SetPageUptodate(page); |
d1310b2e CM |
1959 | } |
1960 | ||
4a54c8c1 JS |
1961 | /* |
1962 | * When IO fails, either with EIO or csum verification fails, we | |
1963 | * try other mirrors that might have a good copy of the data. This | |
1964 | * io_failure_record is used to record state as we go through all the | |
1965 | * mirrors. If another mirror has good data, the page is set up to date | |
1966 | * and things continue. If a good mirror can't be found, the original | |
1967 | * bio end_io callback is called to indicate things have failed. | |
1968 | */ | |
1969 | struct io_failure_record { | |
1970 | struct page *page; | |
1971 | u64 start; | |
1972 | u64 len; | |
1973 | u64 logical; | |
1974 | unsigned long bio_flags; | |
1975 | int this_mirror; | |
1976 | int failed_mirror; | |
1977 | int in_validation; | |
1978 | }; | |
1979 | ||
1980 | static int free_io_failure(struct inode *inode, struct io_failure_record *rec, | |
1981 | int did_repair) | |
1982 | { | |
1983 | int ret; | |
1984 | int err = 0; | |
1985 | struct extent_io_tree *failure_tree = &BTRFS_I(inode)->io_failure_tree; | |
1986 | ||
1987 | set_state_private(failure_tree, rec->start, 0); | |
1988 | ret = clear_extent_bits(failure_tree, rec->start, | |
1989 | rec->start + rec->len - 1, | |
1990 | EXTENT_LOCKED | EXTENT_DIRTY, GFP_NOFS); | |
1991 | if (ret) | |
1992 | err = ret; | |
1993 | ||
53b381b3 DW |
1994 | ret = clear_extent_bits(&BTRFS_I(inode)->io_tree, rec->start, |
1995 | rec->start + rec->len - 1, | |
1996 | EXTENT_DAMAGED, GFP_NOFS); | |
1997 | if (ret && !err) | |
1998 | err = ret; | |
4a54c8c1 JS |
1999 | |
2000 | kfree(rec); | |
2001 | return err; | |
2002 | } | |
2003 | ||
4a54c8c1 JS |
2004 | /* |
2005 | * this bypasses the standard btrfs submit functions deliberately, as | |
2006 | * the standard behavior is to write all copies in a raid setup. here we only | |
2007 | * want to write the one bad copy. so we do the mapping for ourselves and issue | |
2008 | * submit_bio directly. | |
3ec706c8 | 2009 | * to avoid any synchronization issues, wait for the data after writing, which |
4a54c8c1 JS |
2010 | * actually prevents the read that triggered the error from finishing. |
2011 | * currently, there can be no more than two copies of every data bit. thus, | |
2012 | * exactly one rewrite is required. | |
2013 | */ | |
3ec706c8 | 2014 | int repair_io_failure(struct btrfs_fs_info *fs_info, u64 start, |
4a54c8c1 JS |
2015 | u64 length, u64 logical, struct page *page, |
2016 | int mirror_num) | |
2017 | { | |
2018 | struct bio *bio; | |
2019 | struct btrfs_device *dev; | |
4a54c8c1 JS |
2020 | u64 map_length = 0; |
2021 | u64 sector; | |
2022 | struct btrfs_bio *bbio = NULL; | |
53b381b3 | 2023 | struct btrfs_mapping_tree *map_tree = &fs_info->mapping_tree; |
4a54c8c1 JS |
2024 | int ret; |
2025 | ||
908960c6 | 2026 | ASSERT(!(fs_info->sb->s_flags & MS_RDONLY)); |
4a54c8c1 JS |
2027 | BUG_ON(!mirror_num); |
2028 | ||
53b381b3 DW |
2029 | /* we can't repair anything in raid56 yet */ |
2030 | if (btrfs_is_parity_mirror(map_tree, logical, length, mirror_num)) | |
2031 | return 0; | |
2032 | ||
9be3395b | 2033 | bio = btrfs_io_bio_alloc(GFP_NOFS, 1); |
4a54c8c1 JS |
2034 | if (!bio) |
2035 | return -EIO; | |
4f024f37 | 2036 | bio->bi_iter.bi_size = 0; |
4a54c8c1 JS |
2037 | map_length = length; |
2038 | ||
3ec706c8 | 2039 | ret = btrfs_map_block(fs_info, WRITE, logical, |
4a54c8c1 JS |
2040 | &map_length, &bbio, mirror_num); |
2041 | if (ret) { | |
2042 | bio_put(bio); | |
2043 | return -EIO; | |
2044 | } | |
2045 | BUG_ON(mirror_num != bbio->mirror_num); | |
2046 | sector = bbio->stripes[mirror_num-1].physical >> 9; | |
4f024f37 | 2047 | bio->bi_iter.bi_sector = sector; |
4a54c8c1 JS |
2048 | dev = bbio->stripes[mirror_num-1].dev; |
2049 | kfree(bbio); | |
2050 | if (!dev || !dev->bdev || !dev->writeable) { | |
2051 | bio_put(bio); | |
2052 | return -EIO; | |
2053 | } | |
2054 | bio->bi_bdev = dev->bdev; | |
4eee4fa4 | 2055 | bio_add_page(bio, page, length, start - page_offset(page)); |
4a54c8c1 | 2056 | |
33879d45 | 2057 | if (btrfsic_submit_bio_wait(WRITE_SYNC, bio)) { |
4a54c8c1 JS |
2058 | /* try to remap that extent elsewhere? */ |
2059 | bio_put(bio); | |
442a4f63 | 2060 | btrfs_dev_stat_inc_and_print(dev, BTRFS_DEV_STAT_WRITE_ERRS); |
4a54c8c1 JS |
2061 | return -EIO; |
2062 | } | |
2063 | ||
efe120a0 FH |
2064 | printk_ratelimited_in_rcu(KERN_INFO |
2065 | "BTRFS: read error corrected: ino %lu off %llu " | |
2066 | "(dev %s sector %llu)\n", page->mapping->host->i_ino, | |
2067 | start, rcu_str_deref(dev->name), sector); | |
4a54c8c1 JS |
2068 | |
2069 | bio_put(bio); | |
2070 | return 0; | |
2071 | } | |
2072 | ||
ea466794 JB |
2073 | int repair_eb_io_failure(struct btrfs_root *root, struct extent_buffer *eb, |
2074 | int mirror_num) | |
2075 | { | |
ea466794 JB |
2076 | u64 start = eb->start; |
2077 | unsigned long i, num_pages = num_extent_pages(eb->start, eb->len); | |
d95603b2 | 2078 | int ret = 0; |
ea466794 | 2079 | |
908960c6 ID |
2080 | if (root->fs_info->sb->s_flags & MS_RDONLY) |
2081 | return -EROFS; | |
2082 | ||
ea466794 JB |
2083 | for (i = 0; i < num_pages; i++) { |
2084 | struct page *p = extent_buffer_page(eb, i); | |
3ec706c8 | 2085 | ret = repair_io_failure(root->fs_info, start, PAGE_CACHE_SIZE, |
ea466794 JB |
2086 | start, p, mirror_num); |
2087 | if (ret) | |
2088 | break; | |
2089 | start += PAGE_CACHE_SIZE; | |
2090 | } | |
2091 | ||
2092 | return ret; | |
2093 | } | |
2094 | ||
4a54c8c1 JS |
2095 | /* |
2096 | * each time an IO finishes, we do a fast check in the IO failure tree | |
2097 | * to see if we need to process or clean up an io_failure_record | |
2098 | */ | |
2099 | static int clean_io_failure(u64 start, struct page *page) | |
2100 | { | |
2101 | u64 private; | |
2102 | u64 private_failure; | |
2103 | struct io_failure_record *failrec; | |
908960c6 ID |
2104 | struct inode *inode = page->mapping->host; |
2105 | struct btrfs_fs_info *fs_info = BTRFS_I(inode)->root->fs_info; | |
4a54c8c1 JS |
2106 | struct extent_state *state; |
2107 | int num_copies; | |
2108 | int did_repair = 0; | |
2109 | int ret; | |
4a54c8c1 JS |
2110 | |
2111 | private = 0; | |
2112 | ret = count_range_bits(&BTRFS_I(inode)->io_failure_tree, &private, | |
2113 | (u64)-1, 1, EXTENT_DIRTY, 0); | |
2114 | if (!ret) | |
2115 | return 0; | |
2116 | ||
2117 | ret = get_state_private(&BTRFS_I(inode)->io_failure_tree, start, | |
2118 | &private_failure); | |
2119 | if (ret) | |
2120 | return 0; | |
2121 | ||
2122 | failrec = (struct io_failure_record *)(unsigned long) private_failure; | |
2123 | BUG_ON(!failrec->this_mirror); | |
2124 | ||
2125 | if (failrec->in_validation) { | |
2126 | /* there was no real error, just free the record */ | |
2127 | pr_debug("clean_io_failure: freeing dummy error at %llu\n", | |
2128 | failrec->start); | |
2129 | did_repair = 1; | |
2130 | goto out; | |
2131 | } | |
908960c6 ID |
2132 | if (fs_info->sb->s_flags & MS_RDONLY) |
2133 | goto out; | |
4a54c8c1 JS |
2134 | |
2135 | spin_lock(&BTRFS_I(inode)->io_tree.lock); | |
2136 | state = find_first_extent_bit_state(&BTRFS_I(inode)->io_tree, | |
2137 | failrec->start, | |
2138 | EXTENT_LOCKED); | |
2139 | spin_unlock(&BTRFS_I(inode)->io_tree.lock); | |
2140 | ||
883d0de4 MX |
2141 | if (state && state->start <= failrec->start && |
2142 | state->end >= failrec->start + failrec->len - 1) { | |
3ec706c8 SB |
2143 | num_copies = btrfs_num_copies(fs_info, failrec->logical, |
2144 | failrec->len); | |
4a54c8c1 | 2145 | if (num_copies > 1) { |
3ec706c8 | 2146 | ret = repair_io_failure(fs_info, start, failrec->len, |
4a54c8c1 JS |
2147 | failrec->logical, page, |
2148 | failrec->failed_mirror); | |
2149 | did_repair = !ret; | |
2150 | } | |
53b381b3 | 2151 | ret = 0; |
4a54c8c1 JS |
2152 | } |
2153 | ||
2154 | out: | |
2155 | if (!ret) | |
2156 | ret = free_io_failure(inode, failrec, did_repair); | |
2157 | ||
2158 | return ret; | |
2159 | } | |
2160 | ||
2161 | /* | |
2162 | * this is a generic handler for readpage errors (default | |
2163 | * readpage_io_failed_hook). if other copies exist, read those and write back | |
2164 | * good data to the failed position. does not investigate in remapping the | |
2165 | * failed extent elsewhere, hoping the device will be smart enough to do this as | |
2166 | * needed | |
2167 | */ | |
2168 | ||
facc8a22 MX |
2169 | static int bio_readpage_error(struct bio *failed_bio, u64 phy_offset, |
2170 | struct page *page, u64 start, u64 end, | |
2171 | int failed_mirror) | |
4a54c8c1 JS |
2172 | { |
2173 | struct io_failure_record *failrec = NULL; | |
2174 | u64 private; | |
2175 | struct extent_map *em; | |
2176 | struct inode *inode = page->mapping->host; | |
2177 | struct extent_io_tree *failure_tree = &BTRFS_I(inode)->io_failure_tree; | |
2178 | struct extent_io_tree *tree = &BTRFS_I(inode)->io_tree; | |
2179 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; | |
2180 | struct bio *bio; | |
facc8a22 MX |
2181 | struct btrfs_io_bio *btrfs_failed_bio; |
2182 | struct btrfs_io_bio *btrfs_bio; | |
4a54c8c1 JS |
2183 | int num_copies; |
2184 | int ret; | |
2185 | int read_mode; | |
2186 | u64 logical; | |
2187 | ||
2188 | BUG_ON(failed_bio->bi_rw & REQ_WRITE); | |
2189 | ||
2190 | ret = get_state_private(failure_tree, start, &private); | |
2191 | if (ret) { | |
2192 | failrec = kzalloc(sizeof(*failrec), GFP_NOFS); | |
2193 | if (!failrec) | |
2194 | return -ENOMEM; | |
2195 | failrec->start = start; | |
2196 | failrec->len = end - start + 1; | |
2197 | failrec->this_mirror = 0; | |
2198 | failrec->bio_flags = 0; | |
2199 | failrec->in_validation = 0; | |
2200 | ||
2201 | read_lock(&em_tree->lock); | |
2202 | em = lookup_extent_mapping(em_tree, start, failrec->len); | |
2203 | if (!em) { | |
2204 | read_unlock(&em_tree->lock); | |
2205 | kfree(failrec); | |
2206 | return -EIO; | |
2207 | } | |
2208 | ||
68ba990f | 2209 | if (em->start > start || em->start + em->len <= start) { |
4a54c8c1 JS |
2210 | free_extent_map(em); |
2211 | em = NULL; | |
2212 | } | |
2213 | read_unlock(&em_tree->lock); | |
2214 | ||
7a2d6a64 | 2215 | if (!em) { |
4a54c8c1 JS |
2216 | kfree(failrec); |
2217 | return -EIO; | |
2218 | } | |
2219 | logical = start - em->start; | |
2220 | logical = em->block_start + logical; | |
2221 | if (test_bit(EXTENT_FLAG_COMPRESSED, &em->flags)) { | |
2222 | logical = em->block_start; | |
2223 | failrec->bio_flags = EXTENT_BIO_COMPRESSED; | |
2224 | extent_set_compress_type(&failrec->bio_flags, | |
2225 | em->compress_type); | |
2226 | } | |
2227 | pr_debug("bio_readpage_error: (new) logical=%llu, start=%llu, " | |
2228 | "len=%llu\n", logical, start, failrec->len); | |
2229 | failrec->logical = logical; | |
2230 | free_extent_map(em); | |
2231 | ||
2232 | /* set the bits in the private failure tree */ | |
2233 | ret = set_extent_bits(failure_tree, start, end, | |
2234 | EXTENT_LOCKED | EXTENT_DIRTY, GFP_NOFS); | |
2235 | if (ret >= 0) | |
2236 | ret = set_state_private(failure_tree, start, | |
2237 | (u64)(unsigned long)failrec); | |
2238 | /* set the bits in the inode's tree */ | |
2239 | if (ret >= 0) | |
2240 | ret = set_extent_bits(tree, start, end, EXTENT_DAMAGED, | |
2241 | GFP_NOFS); | |
2242 | if (ret < 0) { | |
2243 | kfree(failrec); | |
2244 | return ret; | |
2245 | } | |
2246 | } else { | |
2247 | failrec = (struct io_failure_record *)(unsigned long)private; | |
2248 | pr_debug("bio_readpage_error: (found) logical=%llu, " | |
2249 | "start=%llu, len=%llu, validation=%d\n", | |
2250 | failrec->logical, failrec->start, failrec->len, | |
2251 | failrec->in_validation); | |
2252 | /* | |
2253 | * when data can be on disk more than twice, add to failrec here | |
2254 | * (e.g. with a list for failed_mirror) to make | |
2255 | * clean_io_failure() clean all those errors at once. | |
2256 | */ | |
2257 | } | |
5d964051 SB |
2258 | num_copies = btrfs_num_copies(BTRFS_I(inode)->root->fs_info, |
2259 | failrec->logical, failrec->len); | |
4a54c8c1 JS |
2260 | if (num_copies == 1) { |
2261 | /* | |
2262 | * we only have a single copy of the data, so don't bother with | |
2263 | * all the retry and error correction code that follows. no | |
2264 | * matter what the error is, it is very likely to persist. | |
2265 | */ | |
09a7f7a2 MX |
2266 | pr_debug("bio_readpage_error: cannot repair, num_copies=%d, next_mirror %d, failed_mirror %d\n", |
2267 | num_copies, failrec->this_mirror, failed_mirror); | |
4a54c8c1 JS |
2268 | free_io_failure(inode, failrec, 0); |
2269 | return -EIO; | |
2270 | } | |
2271 | ||
4a54c8c1 JS |
2272 | /* |
2273 | * there are two premises: | |
2274 | * a) deliver good data to the caller | |
2275 | * b) correct the bad sectors on disk | |
2276 | */ | |
2277 | if (failed_bio->bi_vcnt > 1) { | |
2278 | /* | |
2279 | * to fulfill b), we need to know the exact failing sectors, as | |
2280 | * we don't want to rewrite any more than the failed ones. thus, | |
2281 | * we need separate read requests for the failed bio | |
2282 | * | |
2283 | * if the following BUG_ON triggers, our validation request got | |
2284 | * merged. we need separate requests for our algorithm to work. | |
2285 | */ | |
2286 | BUG_ON(failrec->in_validation); | |
2287 | failrec->in_validation = 1; | |
2288 | failrec->this_mirror = failed_mirror; | |
2289 | read_mode = READ_SYNC | REQ_FAILFAST_DEV; | |
2290 | } else { | |
2291 | /* | |
2292 | * we're ready to fulfill a) and b) alongside. get a good copy | |
2293 | * of the failed sector and if we succeed, we have setup | |
2294 | * everything for repair_io_failure to do the rest for us. | |
2295 | */ | |
2296 | if (failrec->in_validation) { | |
2297 | BUG_ON(failrec->this_mirror != failed_mirror); | |
2298 | failrec->in_validation = 0; | |
2299 | failrec->this_mirror = 0; | |
2300 | } | |
2301 | failrec->failed_mirror = failed_mirror; | |
2302 | failrec->this_mirror++; | |
2303 | if (failrec->this_mirror == failed_mirror) | |
2304 | failrec->this_mirror++; | |
2305 | read_mode = READ_SYNC; | |
2306 | } | |
2307 | ||
facc8a22 MX |
2308 | if (failrec->this_mirror > num_copies) { |
2309 | pr_debug("bio_readpage_error: (fail) num_copies=%d, next_mirror %d, failed_mirror %d\n", | |
4a54c8c1 JS |
2310 | num_copies, failrec->this_mirror, failed_mirror); |
2311 | free_io_failure(inode, failrec, 0); | |
2312 | return -EIO; | |
2313 | } | |
2314 | ||
9be3395b | 2315 | bio = btrfs_io_bio_alloc(GFP_NOFS, 1); |
e627ee7b TI |
2316 | if (!bio) { |
2317 | free_io_failure(inode, failrec, 0); | |
2318 | return -EIO; | |
2319 | } | |
4a54c8c1 | 2320 | bio->bi_end_io = failed_bio->bi_end_io; |
4f024f37 | 2321 | bio->bi_iter.bi_sector = failrec->logical >> 9; |
4a54c8c1 | 2322 | bio->bi_bdev = BTRFS_I(inode)->root->fs_info->fs_devices->latest_bdev; |
4f024f37 | 2323 | bio->bi_iter.bi_size = 0; |
4a54c8c1 | 2324 | |
facc8a22 MX |
2325 | btrfs_failed_bio = btrfs_io_bio(failed_bio); |
2326 | if (btrfs_failed_bio->csum) { | |
2327 | struct btrfs_fs_info *fs_info = BTRFS_I(inode)->root->fs_info; | |
2328 | u16 csum_size = btrfs_super_csum_size(fs_info->super_copy); | |
2329 | ||
2330 | btrfs_bio = btrfs_io_bio(bio); | |
2331 | btrfs_bio->csum = btrfs_bio->csum_inline; | |
2332 | phy_offset >>= inode->i_sb->s_blocksize_bits; | |
2333 | phy_offset *= csum_size; | |
2334 | memcpy(btrfs_bio->csum, btrfs_failed_bio->csum + phy_offset, | |
2335 | csum_size); | |
2336 | } | |
2337 | ||
4a54c8c1 JS |
2338 | bio_add_page(bio, page, failrec->len, start - page_offset(page)); |
2339 | ||
2340 | pr_debug("bio_readpage_error: submitting new read[%#x] to " | |
2341 | "this_mirror=%d, num_copies=%d, in_validation=%d\n", read_mode, | |
2342 | failrec->this_mirror, num_copies, failrec->in_validation); | |
2343 | ||
013bd4c3 TI |
2344 | ret = tree->ops->submit_bio_hook(inode, read_mode, bio, |
2345 | failrec->this_mirror, | |
2346 | failrec->bio_flags, 0); | |
2347 | return ret; | |
4a54c8c1 JS |
2348 | } |
2349 | ||
d1310b2e CM |
2350 | /* lots and lots of room for performance fixes in the end_bio funcs */ |
2351 | ||
87826df0 JM |
2352 | int end_extent_writepage(struct page *page, int err, u64 start, u64 end) |
2353 | { | |
2354 | int uptodate = (err == 0); | |
2355 | struct extent_io_tree *tree; | |
2356 | int ret; | |
2357 | ||
2358 | tree = &BTRFS_I(page->mapping->host)->io_tree; | |
2359 | ||
2360 | if (tree->ops && tree->ops->writepage_end_io_hook) { | |
2361 | ret = tree->ops->writepage_end_io_hook(page, start, | |
2362 | end, NULL, uptodate); | |
2363 | if (ret) | |
2364 | uptodate = 0; | |
2365 | } | |
2366 | ||
87826df0 | 2367 | if (!uptodate) { |
87826df0 JM |
2368 | ClearPageUptodate(page); |
2369 | SetPageError(page); | |
2370 | } | |
2371 | return 0; | |
2372 | } | |
2373 | ||
d1310b2e CM |
2374 | /* |
2375 | * after a writepage IO is done, we need to: | |
2376 | * clear the uptodate bits on error | |
2377 | * clear the writeback bits in the extent tree for this IO | |
2378 | * end_page_writeback if the page has no more pending IO | |
2379 | * | |
2380 | * Scheduling is not allowed, so the extent state tree is expected | |
2381 | * to have one and only one object corresponding to this IO. | |
2382 | */ | |
d1310b2e | 2383 | static void end_bio_extent_writepage(struct bio *bio, int err) |
d1310b2e | 2384 | { |
2c30c71b | 2385 | struct bio_vec *bvec; |
d1310b2e CM |
2386 | u64 start; |
2387 | u64 end; | |
2c30c71b | 2388 | int i; |
d1310b2e | 2389 | |
2c30c71b | 2390 | bio_for_each_segment_all(bvec, bio, i) { |
d1310b2e | 2391 | struct page *page = bvec->bv_page; |
902b22f3 | 2392 | |
17a5adcc AO |
2393 | /* We always issue full-page reads, but if some block |
2394 | * in a page fails to read, blk_update_request() will | |
2395 | * advance bv_offset and adjust bv_len to compensate. | |
2396 | * Print a warning for nonzero offsets, and an error | |
2397 | * if they don't add up to a full page. */ | |
efe120a0 FH |
2398 | if (bvec->bv_offset || bvec->bv_len != PAGE_CACHE_SIZE) { |
2399 | if (bvec->bv_offset + bvec->bv_len != PAGE_CACHE_SIZE) | |
2400 | btrfs_err(BTRFS_I(page->mapping->host)->root->fs_info, | |
2401 | "partial page write in btrfs with offset %u and length %u", | |
2402 | bvec->bv_offset, bvec->bv_len); | |
2403 | else | |
2404 | btrfs_info(BTRFS_I(page->mapping->host)->root->fs_info, | |
2405 | "incomplete page write in btrfs with offset %u and " | |
2406 | "length %u", | |
2407 | bvec->bv_offset, bvec->bv_len); | |
2408 | } | |
d1310b2e | 2409 | |
17a5adcc AO |
2410 | start = page_offset(page); |
2411 | end = start + bvec->bv_offset + bvec->bv_len - 1; | |
d1310b2e | 2412 | |
87826df0 JM |
2413 | if (end_extent_writepage(page, err, start, end)) |
2414 | continue; | |
70dec807 | 2415 | |
17a5adcc | 2416 | end_page_writeback(page); |
2c30c71b | 2417 | } |
2b1f55b0 | 2418 | |
d1310b2e | 2419 | bio_put(bio); |
d1310b2e CM |
2420 | } |
2421 | ||
883d0de4 MX |
2422 | static void |
2423 | endio_readpage_release_extent(struct extent_io_tree *tree, u64 start, u64 len, | |
2424 | int uptodate) | |
2425 | { | |
2426 | struct extent_state *cached = NULL; | |
2427 | u64 end = start + len - 1; | |
2428 | ||
2429 | if (uptodate && tree->track_uptodate) | |
2430 | set_extent_uptodate(tree, start, end, &cached, GFP_ATOMIC); | |
2431 | unlock_extent_cached(tree, start, end, &cached, GFP_ATOMIC); | |
2432 | } | |
2433 | ||
d1310b2e CM |
2434 | /* |
2435 | * after a readpage IO is done, we need to: | |
2436 | * clear the uptodate bits on error | |
2437 | * set the uptodate bits if things worked | |
2438 | * set the page up to date if all extents in the tree are uptodate | |
2439 | * clear the lock bit in the extent tree | |
2440 | * unlock the page if there are no other extents locked for it | |
2441 | * | |
2442 | * Scheduling is not allowed, so the extent state tree is expected | |
2443 | * to have one and only one object corresponding to this IO. | |
2444 | */ | |
d1310b2e | 2445 | static void end_bio_extent_readpage(struct bio *bio, int err) |
d1310b2e | 2446 | { |
2c30c71b | 2447 | struct bio_vec *bvec; |
d1310b2e | 2448 | int uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags); |
facc8a22 | 2449 | struct btrfs_io_bio *io_bio = btrfs_io_bio(bio); |
902b22f3 | 2450 | struct extent_io_tree *tree; |
facc8a22 | 2451 | u64 offset = 0; |
d1310b2e CM |
2452 | u64 start; |
2453 | u64 end; | |
facc8a22 | 2454 | u64 len; |
883d0de4 MX |
2455 | u64 extent_start = 0; |
2456 | u64 extent_len = 0; | |
5cf1ab56 | 2457 | int mirror; |
d1310b2e | 2458 | int ret; |
2c30c71b | 2459 | int i; |
d1310b2e | 2460 | |
d20f7043 CM |
2461 | if (err) |
2462 | uptodate = 0; | |
2463 | ||
2c30c71b | 2464 | bio_for_each_segment_all(bvec, bio, i) { |
d1310b2e | 2465 | struct page *page = bvec->bv_page; |
a71754fc | 2466 | struct inode *inode = page->mapping->host; |
507903b8 | 2467 | |
be3940c0 | 2468 | pr_debug("end_bio_extent_readpage: bi_sector=%llu, err=%d, " |
4f024f37 | 2469 | "mirror=%lu\n", (u64)bio->bi_iter.bi_sector, err, |
9be3395b | 2470 | io_bio->mirror_num); |
a71754fc | 2471 | tree = &BTRFS_I(inode)->io_tree; |
902b22f3 | 2472 | |
17a5adcc AO |
2473 | /* We always issue full-page reads, but if some block |
2474 | * in a page fails to read, blk_update_request() will | |
2475 | * advance bv_offset and adjust bv_len to compensate. | |
2476 | * Print a warning for nonzero offsets, and an error | |
2477 | * if they don't add up to a full page. */ | |
efe120a0 FH |
2478 | if (bvec->bv_offset || bvec->bv_len != PAGE_CACHE_SIZE) { |
2479 | if (bvec->bv_offset + bvec->bv_len != PAGE_CACHE_SIZE) | |
2480 | btrfs_err(BTRFS_I(page->mapping->host)->root->fs_info, | |
2481 | "partial page read in btrfs with offset %u and length %u", | |
2482 | bvec->bv_offset, bvec->bv_len); | |
2483 | else | |
2484 | btrfs_info(BTRFS_I(page->mapping->host)->root->fs_info, | |
2485 | "incomplete page read in btrfs with offset %u and " | |
2486 | "length %u", | |
2487 | bvec->bv_offset, bvec->bv_len); | |
2488 | } | |
d1310b2e | 2489 | |
17a5adcc AO |
2490 | start = page_offset(page); |
2491 | end = start + bvec->bv_offset + bvec->bv_len - 1; | |
facc8a22 | 2492 | len = bvec->bv_len; |
d1310b2e | 2493 | |
9be3395b | 2494 | mirror = io_bio->mirror_num; |
f2a09da9 MX |
2495 | if (likely(uptodate && tree->ops && |
2496 | tree->ops->readpage_end_io_hook)) { | |
facc8a22 MX |
2497 | ret = tree->ops->readpage_end_io_hook(io_bio, offset, |
2498 | page, start, end, | |
2499 | mirror); | |
5ee0844d | 2500 | if (ret) |
d1310b2e | 2501 | uptodate = 0; |
5ee0844d | 2502 | else |
4a54c8c1 | 2503 | clean_io_failure(start, page); |
d1310b2e | 2504 | } |
ea466794 | 2505 | |
f2a09da9 MX |
2506 | if (likely(uptodate)) |
2507 | goto readpage_ok; | |
2508 | ||
2509 | if (tree->ops && tree->ops->readpage_io_failed_hook) { | |
5cf1ab56 | 2510 | ret = tree->ops->readpage_io_failed_hook(page, mirror); |
ea466794 JB |
2511 | if (!ret && !err && |
2512 | test_bit(BIO_UPTODATE, &bio->bi_flags)) | |
2513 | uptodate = 1; | |
f2a09da9 | 2514 | } else { |
f4a8e656 JS |
2515 | /* |
2516 | * The generic bio_readpage_error handles errors the | |
2517 | * following way: If possible, new read requests are | |
2518 | * created and submitted and will end up in | |
2519 | * end_bio_extent_readpage as well (if we're lucky, not | |
2520 | * in the !uptodate case). In that case it returns 0 and | |
2521 | * we just go on with the next page in our bio. If it | |
2522 | * can't handle the error it will return -EIO and we | |
2523 | * remain responsible for that page. | |
2524 | */ | |
facc8a22 MX |
2525 | ret = bio_readpage_error(bio, offset, page, start, end, |
2526 | mirror); | |
7e38326f | 2527 | if (ret == 0) { |
3b951516 CM |
2528 | uptodate = |
2529 | test_bit(BIO_UPTODATE, &bio->bi_flags); | |
d20f7043 CM |
2530 | if (err) |
2531 | uptodate = 0; | |
7e38326f CM |
2532 | continue; |
2533 | } | |
2534 | } | |
f2a09da9 | 2535 | readpage_ok: |
883d0de4 | 2536 | if (likely(uptodate)) { |
a71754fc JB |
2537 | loff_t i_size = i_size_read(inode); |
2538 | pgoff_t end_index = i_size >> PAGE_CACHE_SHIFT; | |
2539 | unsigned offset; | |
2540 | ||
2541 | /* Zero out the end if this page straddles i_size */ | |
2542 | offset = i_size & (PAGE_CACHE_SIZE-1); | |
2543 | if (page->index == end_index && offset) | |
2544 | zero_user_segment(page, offset, PAGE_CACHE_SIZE); | |
17a5adcc | 2545 | SetPageUptodate(page); |
70dec807 | 2546 | } else { |
17a5adcc AO |
2547 | ClearPageUptodate(page); |
2548 | SetPageError(page); | |
70dec807 | 2549 | } |
17a5adcc | 2550 | unlock_page(page); |
facc8a22 | 2551 | offset += len; |
883d0de4 MX |
2552 | |
2553 | if (unlikely(!uptodate)) { | |
2554 | if (extent_len) { | |
2555 | endio_readpage_release_extent(tree, | |
2556 | extent_start, | |
2557 | extent_len, 1); | |
2558 | extent_start = 0; | |
2559 | extent_len = 0; | |
2560 | } | |
2561 | endio_readpage_release_extent(tree, start, | |
2562 | end - start + 1, 0); | |
2563 | } else if (!extent_len) { | |
2564 | extent_start = start; | |
2565 | extent_len = end + 1 - start; | |
2566 | } else if (extent_start + extent_len == start) { | |
2567 | extent_len += end + 1 - start; | |
2568 | } else { | |
2569 | endio_readpage_release_extent(tree, extent_start, | |
2570 | extent_len, uptodate); | |
2571 | extent_start = start; | |
2572 | extent_len = end + 1 - start; | |
2573 | } | |
2c30c71b | 2574 | } |
d1310b2e | 2575 | |
883d0de4 MX |
2576 | if (extent_len) |
2577 | endio_readpage_release_extent(tree, extent_start, extent_len, | |
2578 | uptodate); | |
facc8a22 MX |
2579 | if (io_bio->end_io) |
2580 | io_bio->end_io(io_bio, err); | |
d1310b2e | 2581 | bio_put(bio); |
d1310b2e CM |
2582 | } |
2583 | ||
9be3395b CM |
2584 | /* |
2585 | * this allocates from the btrfs_bioset. We're returning a bio right now | |
2586 | * but you can call btrfs_io_bio for the appropriate container_of magic | |
2587 | */ | |
88f794ed MX |
2588 | struct bio * |
2589 | btrfs_bio_alloc(struct block_device *bdev, u64 first_sector, int nr_vecs, | |
2590 | gfp_t gfp_flags) | |
d1310b2e | 2591 | { |
facc8a22 | 2592 | struct btrfs_io_bio *btrfs_bio; |
d1310b2e CM |
2593 | struct bio *bio; |
2594 | ||
9be3395b | 2595 | bio = bio_alloc_bioset(gfp_flags, nr_vecs, btrfs_bioset); |
d1310b2e CM |
2596 | |
2597 | if (bio == NULL && (current->flags & PF_MEMALLOC)) { | |
9be3395b CM |
2598 | while (!bio && (nr_vecs /= 2)) { |
2599 | bio = bio_alloc_bioset(gfp_flags, | |
2600 | nr_vecs, btrfs_bioset); | |
2601 | } | |
d1310b2e CM |
2602 | } |
2603 | ||
2604 | if (bio) { | |
2605 | bio->bi_bdev = bdev; | |
4f024f37 | 2606 | bio->bi_iter.bi_sector = first_sector; |
facc8a22 MX |
2607 | btrfs_bio = btrfs_io_bio(bio); |
2608 | btrfs_bio->csum = NULL; | |
2609 | btrfs_bio->csum_allocated = NULL; | |
2610 | btrfs_bio->end_io = NULL; | |
d1310b2e CM |
2611 | } |
2612 | return bio; | |
2613 | } | |
2614 | ||
9be3395b CM |
2615 | struct bio *btrfs_bio_clone(struct bio *bio, gfp_t gfp_mask) |
2616 | { | |
2617 | return bio_clone_bioset(bio, gfp_mask, btrfs_bioset); | |
2618 | } | |
2619 | ||
2620 | ||
2621 | /* this also allocates from the btrfs_bioset */ | |
2622 | struct bio *btrfs_io_bio_alloc(gfp_t gfp_mask, unsigned int nr_iovecs) | |
2623 | { | |
facc8a22 MX |
2624 | struct btrfs_io_bio *btrfs_bio; |
2625 | struct bio *bio; | |
2626 | ||
2627 | bio = bio_alloc_bioset(gfp_mask, nr_iovecs, btrfs_bioset); | |
2628 | if (bio) { | |
2629 | btrfs_bio = btrfs_io_bio(bio); | |
2630 | btrfs_bio->csum = NULL; | |
2631 | btrfs_bio->csum_allocated = NULL; | |
2632 | btrfs_bio->end_io = NULL; | |
2633 | } | |
2634 | return bio; | |
9be3395b CM |
2635 | } |
2636 | ||
2637 | ||
355808c2 JM |
2638 | static int __must_check submit_one_bio(int rw, struct bio *bio, |
2639 | int mirror_num, unsigned long bio_flags) | |
d1310b2e | 2640 | { |
d1310b2e | 2641 | int ret = 0; |
70dec807 CM |
2642 | struct bio_vec *bvec = bio->bi_io_vec + bio->bi_vcnt - 1; |
2643 | struct page *page = bvec->bv_page; | |
2644 | struct extent_io_tree *tree = bio->bi_private; | |
70dec807 | 2645 | u64 start; |
70dec807 | 2646 | |
4eee4fa4 | 2647 | start = page_offset(page) + bvec->bv_offset; |
70dec807 | 2648 | |
902b22f3 | 2649 | bio->bi_private = NULL; |
d1310b2e CM |
2650 | |
2651 | bio_get(bio); | |
2652 | ||
065631f6 | 2653 | if (tree->ops && tree->ops->submit_bio_hook) |
6b82ce8d | 2654 | ret = tree->ops->submit_bio_hook(page->mapping->host, rw, bio, |
eaf25d93 | 2655 | mirror_num, bio_flags, start); |
0b86a832 | 2656 | else |
21adbd5c | 2657 | btrfsic_submit_bio(rw, bio); |
4a54c8c1 | 2658 | |
d1310b2e CM |
2659 | if (bio_flagged(bio, BIO_EOPNOTSUPP)) |
2660 | ret = -EOPNOTSUPP; | |
2661 | bio_put(bio); | |
2662 | return ret; | |
2663 | } | |
2664 | ||
64a16701 | 2665 | static int merge_bio(int rw, struct extent_io_tree *tree, struct page *page, |
3444a972 JM |
2666 | unsigned long offset, size_t size, struct bio *bio, |
2667 | unsigned long bio_flags) | |
2668 | { | |
2669 | int ret = 0; | |
2670 | if (tree->ops && tree->ops->merge_bio_hook) | |
64a16701 | 2671 | ret = tree->ops->merge_bio_hook(rw, page, offset, size, bio, |
3444a972 JM |
2672 | bio_flags); |
2673 | BUG_ON(ret < 0); | |
2674 | return ret; | |
2675 | ||
2676 | } | |
2677 | ||
d1310b2e CM |
2678 | static int submit_extent_page(int rw, struct extent_io_tree *tree, |
2679 | struct page *page, sector_t sector, | |
2680 | size_t size, unsigned long offset, | |
2681 | struct block_device *bdev, | |
2682 | struct bio **bio_ret, | |
2683 | unsigned long max_pages, | |
f188591e | 2684 | bio_end_io_t end_io_func, |
c8b97818 CM |
2685 | int mirror_num, |
2686 | unsigned long prev_bio_flags, | |
2687 | unsigned long bio_flags) | |
d1310b2e CM |
2688 | { |
2689 | int ret = 0; | |
2690 | struct bio *bio; | |
2691 | int nr; | |
c8b97818 CM |
2692 | int contig = 0; |
2693 | int this_compressed = bio_flags & EXTENT_BIO_COMPRESSED; | |
2694 | int old_compressed = prev_bio_flags & EXTENT_BIO_COMPRESSED; | |
5b050f04 | 2695 | size_t page_size = min_t(size_t, size, PAGE_CACHE_SIZE); |
d1310b2e CM |
2696 | |
2697 | if (bio_ret && *bio_ret) { | |
2698 | bio = *bio_ret; | |
c8b97818 | 2699 | if (old_compressed) |
4f024f37 | 2700 | contig = bio->bi_iter.bi_sector == sector; |
c8b97818 | 2701 | else |
f73a1c7d | 2702 | contig = bio_end_sector(bio) == sector; |
c8b97818 CM |
2703 | |
2704 | if (prev_bio_flags != bio_flags || !contig || | |
64a16701 | 2705 | merge_bio(rw, tree, page, offset, page_size, bio, bio_flags) || |
c8b97818 CM |
2706 | bio_add_page(bio, page, page_size, offset) < page_size) { |
2707 | ret = submit_one_bio(rw, bio, mirror_num, | |
2708 | prev_bio_flags); | |
79787eaa JM |
2709 | if (ret < 0) |
2710 | return ret; | |
d1310b2e CM |
2711 | bio = NULL; |
2712 | } else { | |
2713 | return 0; | |
2714 | } | |
2715 | } | |
c8b97818 CM |
2716 | if (this_compressed) |
2717 | nr = BIO_MAX_PAGES; | |
2718 | else | |
2719 | nr = bio_get_nr_vecs(bdev); | |
2720 | ||
88f794ed | 2721 | bio = btrfs_bio_alloc(bdev, sector, nr, GFP_NOFS | __GFP_HIGH); |
5df67083 TI |
2722 | if (!bio) |
2723 | return -ENOMEM; | |
70dec807 | 2724 | |
c8b97818 | 2725 | bio_add_page(bio, page, page_size, offset); |
d1310b2e CM |
2726 | bio->bi_end_io = end_io_func; |
2727 | bio->bi_private = tree; | |
70dec807 | 2728 | |
d397712b | 2729 | if (bio_ret) |
d1310b2e | 2730 | *bio_ret = bio; |
d397712b | 2731 | else |
c8b97818 | 2732 | ret = submit_one_bio(rw, bio, mirror_num, bio_flags); |
d1310b2e CM |
2733 | |
2734 | return ret; | |
2735 | } | |
2736 | ||
48a3b636 ES |
2737 | static void attach_extent_buffer_page(struct extent_buffer *eb, |
2738 | struct page *page) | |
d1310b2e CM |
2739 | { |
2740 | if (!PagePrivate(page)) { | |
2741 | SetPagePrivate(page); | |
d1310b2e | 2742 | page_cache_get(page); |
4f2de97a JB |
2743 | set_page_private(page, (unsigned long)eb); |
2744 | } else { | |
2745 | WARN_ON(page->private != (unsigned long)eb); | |
d1310b2e CM |
2746 | } |
2747 | } | |
2748 | ||
4f2de97a | 2749 | void set_page_extent_mapped(struct page *page) |
d1310b2e | 2750 | { |
4f2de97a JB |
2751 | if (!PagePrivate(page)) { |
2752 | SetPagePrivate(page); | |
2753 | page_cache_get(page); | |
2754 | set_page_private(page, EXTENT_PAGE_PRIVATE); | |
2755 | } | |
d1310b2e CM |
2756 | } |
2757 | ||
125bac01 MX |
2758 | static struct extent_map * |
2759 | __get_extent_map(struct inode *inode, struct page *page, size_t pg_offset, | |
2760 | u64 start, u64 len, get_extent_t *get_extent, | |
2761 | struct extent_map **em_cached) | |
2762 | { | |
2763 | struct extent_map *em; | |
2764 | ||
2765 | if (em_cached && *em_cached) { | |
2766 | em = *em_cached; | |
cbc0e928 | 2767 | if (extent_map_in_tree(em) && start >= em->start && |
125bac01 MX |
2768 | start < extent_map_end(em)) { |
2769 | atomic_inc(&em->refs); | |
2770 | return em; | |
2771 | } | |
2772 | ||
2773 | free_extent_map(em); | |
2774 | *em_cached = NULL; | |
2775 | } | |
2776 | ||
2777 | em = get_extent(inode, page, pg_offset, start, len, 0); | |
2778 | if (em_cached && !IS_ERR_OR_NULL(em)) { | |
2779 | BUG_ON(*em_cached); | |
2780 | atomic_inc(&em->refs); | |
2781 | *em_cached = em; | |
2782 | } | |
2783 | return em; | |
2784 | } | |
d1310b2e CM |
2785 | /* |
2786 | * basic readpage implementation. Locked extent state structs are inserted | |
2787 | * into the tree that are removed when the IO is done (by the end_io | |
2788 | * handlers) | |
79787eaa | 2789 | * XXX JDM: This needs looking at to ensure proper page locking |
d1310b2e | 2790 | */ |
9974090b MX |
2791 | static int __do_readpage(struct extent_io_tree *tree, |
2792 | struct page *page, | |
2793 | get_extent_t *get_extent, | |
125bac01 | 2794 | struct extent_map **em_cached, |
9974090b MX |
2795 | struct bio **bio, int mirror_num, |
2796 | unsigned long *bio_flags, int rw) | |
d1310b2e CM |
2797 | { |
2798 | struct inode *inode = page->mapping->host; | |
4eee4fa4 | 2799 | u64 start = page_offset(page); |
d1310b2e CM |
2800 | u64 page_end = start + PAGE_CACHE_SIZE - 1; |
2801 | u64 end; | |
2802 | u64 cur = start; | |
2803 | u64 extent_offset; | |
2804 | u64 last_byte = i_size_read(inode); | |
2805 | u64 block_start; | |
2806 | u64 cur_end; | |
2807 | sector_t sector; | |
2808 | struct extent_map *em; | |
2809 | struct block_device *bdev; | |
2810 | int ret; | |
2811 | int nr = 0; | |
4b384318 | 2812 | int parent_locked = *bio_flags & EXTENT_BIO_PARENT_LOCKED; |
306e16ce | 2813 | size_t pg_offset = 0; |
d1310b2e | 2814 | size_t iosize; |
c8b97818 | 2815 | size_t disk_io_size; |
d1310b2e | 2816 | size_t blocksize = inode->i_sb->s_blocksize; |
4b384318 | 2817 | unsigned long this_bio_flag = *bio_flags & EXTENT_BIO_PARENT_LOCKED; |
d1310b2e CM |
2818 | |
2819 | set_page_extent_mapped(page); | |
2820 | ||
9974090b | 2821 | end = page_end; |
90a887c9 DM |
2822 | if (!PageUptodate(page)) { |
2823 | if (cleancache_get_page(page) == 0) { | |
2824 | BUG_ON(blocksize != PAGE_SIZE); | |
9974090b | 2825 | unlock_extent(tree, start, end); |
90a887c9 DM |
2826 | goto out; |
2827 | } | |
2828 | } | |
2829 | ||
c8b97818 CM |
2830 | if (page->index == last_byte >> PAGE_CACHE_SHIFT) { |
2831 | char *userpage; | |
2832 | size_t zero_offset = last_byte & (PAGE_CACHE_SIZE - 1); | |
2833 | ||
2834 | if (zero_offset) { | |
2835 | iosize = PAGE_CACHE_SIZE - zero_offset; | |
7ac687d9 | 2836 | userpage = kmap_atomic(page); |
c8b97818 CM |
2837 | memset(userpage + zero_offset, 0, iosize); |
2838 | flush_dcache_page(page); | |
7ac687d9 | 2839 | kunmap_atomic(userpage); |
c8b97818 CM |
2840 | } |
2841 | } | |
d1310b2e | 2842 | while (cur <= end) { |
c8f2f24b JB |
2843 | unsigned long pnr = (last_byte >> PAGE_CACHE_SHIFT) + 1; |
2844 | ||
d1310b2e CM |
2845 | if (cur >= last_byte) { |
2846 | char *userpage; | |
507903b8 AJ |
2847 | struct extent_state *cached = NULL; |
2848 | ||
306e16ce | 2849 | iosize = PAGE_CACHE_SIZE - pg_offset; |
7ac687d9 | 2850 | userpage = kmap_atomic(page); |
306e16ce | 2851 | memset(userpage + pg_offset, 0, iosize); |
d1310b2e | 2852 | flush_dcache_page(page); |
7ac687d9 | 2853 | kunmap_atomic(userpage); |
d1310b2e | 2854 | set_extent_uptodate(tree, cur, cur + iosize - 1, |
507903b8 | 2855 | &cached, GFP_NOFS); |
4b384318 MF |
2856 | if (!parent_locked) |
2857 | unlock_extent_cached(tree, cur, | |
2858 | cur + iosize - 1, | |
2859 | &cached, GFP_NOFS); | |
d1310b2e CM |
2860 | break; |
2861 | } | |
125bac01 MX |
2862 | em = __get_extent_map(inode, page, pg_offset, cur, |
2863 | end - cur + 1, get_extent, em_cached); | |
c704005d | 2864 | if (IS_ERR_OR_NULL(em)) { |
d1310b2e | 2865 | SetPageError(page); |
4b384318 MF |
2866 | if (!parent_locked) |
2867 | unlock_extent(tree, cur, end); | |
d1310b2e CM |
2868 | break; |
2869 | } | |
d1310b2e CM |
2870 | extent_offset = cur - em->start; |
2871 | BUG_ON(extent_map_end(em) <= cur); | |
2872 | BUG_ON(end < cur); | |
2873 | ||
261507a0 | 2874 | if (test_bit(EXTENT_FLAG_COMPRESSED, &em->flags)) { |
4b384318 | 2875 | this_bio_flag |= EXTENT_BIO_COMPRESSED; |
261507a0 LZ |
2876 | extent_set_compress_type(&this_bio_flag, |
2877 | em->compress_type); | |
2878 | } | |
c8b97818 | 2879 | |
d1310b2e CM |
2880 | iosize = min(extent_map_end(em) - cur, end - cur + 1); |
2881 | cur_end = min(extent_map_end(em) - 1, end); | |
fda2832f | 2882 | iosize = ALIGN(iosize, blocksize); |
c8b97818 CM |
2883 | if (this_bio_flag & EXTENT_BIO_COMPRESSED) { |
2884 | disk_io_size = em->block_len; | |
2885 | sector = em->block_start >> 9; | |
2886 | } else { | |
2887 | sector = (em->block_start + extent_offset) >> 9; | |
2888 | disk_io_size = iosize; | |
2889 | } | |
d1310b2e CM |
2890 | bdev = em->bdev; |
2891 | block_start = em->block_start; | |
d899e052 YZ |
2892 | if (test_bit(EXTENT_FLAG_PREALLOC, &em->flags)) |
2893 | block_start = EXTENT_MAP_HOLE; | |
d1310b2e CM |
2894 | free_extent_map(em); |
2895 | em = NULL; | |
2896 | ||
2897 | /* we've found a hole, just zero and go on */ | |
2898 | if (block_start == EXTENT_MAP_HOLE) { | |
2899 | char *userpage; | |
507903b8 AJ |
2900 | struct extent_state *cached = NULL; |
2901 | ||
7ac687d9 | 2902 | userpage = kmap_atomic(page); |
306e16ce | 2903 | memset(userpage + pg_offset, 0, iosize); |
d1310b2e | 2904 | flush_dcache_page(page); |
7ac687d9 | 2905 | kunmap_atomic(userpage); |
d1310b2e CM |
2906 | |
2907 | set_extent_uptodate(tree, cur, cur + iosize - 1, | |
507903b8 AJ |
2908 | &cached, GFP_NOFS); |
2909 | unlock_extent_cached(tree, cur, cur + iosize - 1, | |
2910 | &cached, GFP_NOFS); | |
d1310b2e | 2911 | cur = cur + iosize; |
306e16ce | 2912 | pg_offset += iosize; |
d1310b2e CM |
2913 | continue; |
2914 | } | |
2915 | /* the get_extent function already copied into the page */ | |
9655d298 CM |
2916 | if (test_range_bit(tree, cur, cur_end, |
2917 | EXTENT_UPTODATE, 1, NULL)) { | |
a1b32a59 | 2918 | check_page_uptodate(tree, page); |
4b384318 MF |
2919 | if (!parent_locked) |
2920 | unlock_extent(tree, cur, cur + iosize - 1); | |
d1310b2e | 2921 | cur = cur + iosize; |
306e16ce | 2922 | pg_offset += iosize; |
d1310b2e CM |
2923 | continue; |
2924 | } | |
70dec807 CM |
2925 | /* we have an inline extent but it didn't get marked up |
2926 | * to date. Error out | |
2927 | */ | |
2928 | if (block_start == EXTENT_MAP_INLINE) { | |
2929 | SetPageError(page); | |
4b384318 MF |
2930 | if (!parent_locked) |
2931 | unlock_extent(tree, cur, cur + iosize - 1); | |
70dec807 | 2932 | cur = cur + iosize; |
306e16ce | 2933 | pg_offset += iosize; |
70dec807 CM |
2934 | continue; |
2935 | } | |
d1310b2e | 2936 | |
c8f2f24b | 2937 | pnr -= page->index; |
d4c7ca86 | 2938 | ret = submit_extent_page(rw, tree, page, |
306e16ce | 2939 | sector, disk_io_size, pg_offset, |
89642229 | 2940 | bdev, bio, pnr, |
c8b97818 CM |
2941 | end_bio_extent_readpage, mirror_num, |
2942 | *bio_flags, | |
2943 | this_bio_flag); | |
c8f2f24b JB |
2944 | if (!ret) { |
2945 | nr++; | |
2946 | *bio_flags = this_bio_flag; | |
2947 | } else { | |
d1310b2e | 2948 | SetPageError(page); |
4b384318 MF |
2949 | if (!parent_locked) |
2950 | unlock_extent(tree, cur, cur + iosize - 1); | |
edd33c99 | 2951 | } |
d1310b2e | 2952 | cur = cur + iosize; |
306e16ce | 2953 | pg_offset += iosize; |
d1310b2e | 2954 | } |
90a887c9 | 2955 | out: |
d1310b2e CM |
2956 | if (!nr) { |
2957 | if (!PageError(page)) | |
2958 | SetPageUptodate(page); | |
2959 | unlock_page(page); | |
2960 | } | |
2961 | return 0; | |
2962 | } | |
2963 | ||
9974090b MX |
2964 | static inline void __do_contiguous_readpages(struct extent_io_tree *tree, |
2965 | struct page *pages[], int nr_pages, | |
2966 | u64 start, u64 end, | |
2967 | get_extent_t *get_extent, | |
125bac01 | 2968 | struct extent_map **em_cached, |
9974090b MX |
2969 | struct bio **bio, int mirror_num, |
2970 | unsigned long *bio_flags, int rw) | |
2971 | { | |
2972 | struct inode *inode; | |
2973 | struct btrfs_ordered_extent *ordered; | |
2974 | int index; | |
2975 | ||
2976 | inode = pages[0]->mapping->host; | |
2977 | while (1) { | |
2978 | lock_extent(tree, start, end); | |
2979 | ordered = btrfs_lookup_ordered_range(inode, start, | |
2980 | end - start + 1); | |
2981 | if (!ordered) | |
2982 | break; | |
2983 | unlock_extent(tree, start, end); | |
2984 | btrfs_start_ordered_extent(inode, ordered, 1); | |
2985 | btrfs_put_ordered_extent(ordered); | |
2986 | } | |
2987 | ||
2988 | for (index = 0; index < nr_pages; index++) { | |
125bac01 MX |
2989 | __do_readpage(tree, pages[index], get_extent, em_cached, bio, |
2990 | mirror_num, bio_flags, rw); | |
9974090b MX |
2991 | page_cache_release(pages[index]); |
2992 | } | |
2993 | } | |
2994 | ||
2995 | static void __extent_readpages(struct extent_io_tree *tree, | |
2996 | struct page *pages[], | |
2997 | int nr_pages, get_extent_t *get_extent, | |
125bac01 | 2998 | struct extent_map **em_cached, |
9974090b MX |
2999 | struct bio **bio, int mirror_num, |
3000 | unsigned long *bio_flags, int rw) | |
3001 | { | |
35a3621b | 3002 | u64 start = 0; |
9974090b MX |
3003 | u64 end = 0; |
3004 | u64 page_start; | |
3005 | int index; | |
35a3621b | 3006 | int first_index = 0; |
9974090b MX |
3007 | |
3008 | for (index = 0; index < nr_pages; index++) { | |
3009 | page_start = page_offset(pages[index]); | |
3010 | if (!end) { | |
3011 | start = page_start; | |
3012 | end = start + PAGE_CACHE_SIZE - 1; | |
3013 | first_index = index; | |
3014 | } else if (end + 1 == page_start) { | |
3015 | end += PAGE_CACHE_SIZE; | |
3016 | } else { | |
3017 | __do_contiguous_readpages(tree, &pages[first_index], | |
3018 | index - first_index, start, | |
125bac01 MX |
3019 | end, get_extent, em_cached, |
3020 | bio, mirror_num, bio_flags, | |
3021 | rw); | |
9974090b MX |
3022 | start = page_start; |
3023 | end = start + PAGE_CACHE_SIZE - 1; | |
3024 | first_index = index; | |
3025 | } | |
3026 | } | |
3027 | ||
3028 | if (end) | |
3029 | __do_contiguous_readpages(tree, &pages[first_index], | |
3030 | index - first_index, start, | |
125bac01 | 3031 | end, get_extent, em_cached, bio, |
9974090b MX |
3032 | mirror_num, bio_flags, rw); |
3033 | } | |
3034 | ||
3035 | static int __extent_read_full_page(struct extent_io_tree *tree, | |
3036 | struct page *page, | |
3037 | get_extent_t *get_extent, | |
3038 | struct bio **bio, int mirror_num, | |
3039 | unsigned long *bio_flags, int rw) | |
3040 | { | |
3041 | struct inode *inode = page->mapping->host; | |
3042 | struct btrfs_ordered_extent *ordered; | |
3043 | u64 start = page_offset(page); | |
3044 | u64 end = start + PAGE_CACHE_SIZE - 1; | |
3045 | int ret; | |
3046 | ||
3047 | while (1) { | |
3048 | lock_extent(tree, start, end); | |
3049 | ordered = btrfs_lookup_ordered_extent(inode, start); | |
3050 | if (!ordered) | |
3051 | break; | |
3052 | unlock_extent(tree, start, end); | |
3053 | btrfs_start_ordered_extent(inode, ordered, 1); | |
3054 | btrfs_put_ordered_extent(ordered); | |
3055 | } | |
3056 | ||
125bac01 MX |
3057 | ret = __do_readpage(tree, page, get_extent, NULL, bio, mirror_num, |
3058 | bio_flags, rw); | |
9974090b MX |
3059 | return ret; |
3060 | } | |
3061 | ||
d1310b2e | 3062 | int extent_read_full_page(struct extent_io_tree *tree, struct page *page, |
8ddc7d9c | 3063 | get_extent_t *get_extent, int mirror_num) |
d1310b2e CM |
3064 | { |
3065 | struct bio *bio = NULL; | |
c8b97818 | 3066 | unsigned long bio_flags = 0; |
d1310b2e CM |
3067 | int ret; |
3068 | ||
8ddc7d9c | 3069 | ret = __extent_read_full_page(tree, page, get_extent, &bio, mirror_num, |
d4c7ca86 | 3070 | &bio_flags, READ); |
d1310b2e | 3071 | if (bio) |
8ddc7d9c | 3072 | ret = submit_one_bio(READ, bio, mirror_num, bio_flags); |
d1310b2e CM |
3073 | return ret; |
3074 | } | |
d1310b2e | 3075 | |
4b384318 MF |
3076 | int extent_read_full_page_nolock(struct extent_io_tree *tree, struct page *page, |
3077 | get_extent_t *get_extent, int mirror_num) | |
3078 | { | |
3079 | struct bio *bio = NULL; | |
3080 | unsigned long bio_flags = EXTENT_BIO_PARENT_LOCKED; | |
3081 | int ret; | |
3082 | ||
3083 | ret = __do_readpage(tree, page, get_extent, NULL, &bio, mirror_num, | |
3084 | &bio_flags, READ); | |
3085 | if (bio) | |
3086 | ret = submit_one_bio(READ, bio, mirror_num, bio_flags); | |
3087 | return ret; | |
3088 | } | |
3089 | ||
11c8349b CM |
3090 | static noinline void update_nr_written(struct page *page, |
3091 | struct writeback_control *wbc, | |
3092 | unsigned long nr_written) | |
3093 | { | |
3094 | wbc->nr_to_write -= nr_written; | |
3095 | if (wbc->range_cyclic || (wbc->nr_to_write > 0 && | |
3096 | wbc->range_start == 0 && wbc->range_end == LLONG_MAX)) | |
3097 | page->mapping->writeback_index = page->index + nr_written; | |
3098 | } | |
3099 | ||
d1310b2e CM |
3100 | /* |
3101 | * the writepage semantics are similar to regular writepage. extent | |
3102 | * records are inserted to lock ranges in the tree, and as dirty areas | |
3103 | * are found, they are marked writeback. Then the lock bits are removed | |
3104 | * and the end_io handler clears the writeback ranges | |
3105 | */ | |
3106 | static int __extent_writepage(struct page *page, struct writeback_control *wbc, | |
3107 | void *data) | |
3108 | { | |
3109 | struct inode *inode = page->mapping->host; | |
3110 | struct extent_page_data *epd = data; | |
3111 | struct extent_io_tree *tree = epd->tree; | |
4eee4fa4 | 3112 | u64 start = page_offset(page); |
d1310b2e CM |
3113 | u64 delalloc_start; |
3114 | u64 page_end = start + PAGE_CACHE_SIZE - 1; | |
3115 | u64 end; | |
3116 | u64 cur = start; | |
3117 | u64 extent_offset; | |
3118 | u64 last_byte = i_size_read(inode); | |
3119 | u64 block_start; | |
3120 | u64 iosize; | |
3121 | sector_t sector; | |
2c64c53d | 3122 | struct extent_state *cached_state = NULL; |
d1310b2e CM |
3123 | struct extent_map *em; |
3124 | struct block_device *bdev; | |
3125 | int ret; | |
3126 | int nr = 0; | |
7f3c74fb | 3127 | size_t pg_offset = 0; |
d1310b2e CM |
3128 | size_t blocksize; |
3129 | loff_t i_size = i_size_read(inode); | |
3130 | unsigned long end_index = i_size >> PAGE_CACHE_SHIFT; | |
3131 | u64 nr_delalloc; | |
3132 | u64 delalloc_end; | |
c8b97818 CM |
3133 | int page_started; |
3134 | int compressed; | |
ffbd517d | 3135 | int write_flags; |
771ed689 | 3136 | unsigned long nr_written = 0; |
9e487107 | 3137 | bool fill_delalloc = true; |
d1310b2e | 3138 | |
ffbd517d | 3139 | if (wbc->sync_mode == WB_SYNC_ALL) |
721a9602 | 3140 | write_flags = WRITE_SYNC; |
ffbd517d CM |
3141 | else |
3142 | write_flags = WRITE; | |
3143 | ||
1abe9b8a | 3144 | trace___extent_writepage(page, inode, wbc); |
3145 | ||
d1310b2e | 3146 | WARN_ON(!PageLocked(page)); |
bf0da8c1 CM |
3147 | |
3148 | ClearPageError(page); | |
3149 | ||
7f3c74fb | 3150 | pg_offset = i_size & (PAGE_CACHE_SIZE - 1); |
211c17f5 | 3151 | if (page->index > end_index || |
7f3c74fb | 3152 | (page->index == end_index && !pg_offset)) { |
d47992f8 | 3153 | page->mapping->a_ops->invalidatepage(page, 0, PAGE_CACHE_SIZE); |
d1310b2e CM |
3154 | unlock_page(page); |
3155 | return 0; | |
3156 | } | |
3157 | ||
3158 | if (page->index == end_index) { | |
3159 | char *userpage; | |
3160 | ||
7ac687d9 | 3161 | userpage = kmap_atomic(page); |
7f3c74fb CM |
3162 | memset(userpage + pg_offset, 0, |
3163 | PAGE_CACHE_SIZE - pg_offset); | |
7ac687d9 | 3164 | kunmap_atomic(userpage); |
211c17f5 | 3165 | flush_dcache_page(page); |
d1310b2e | 3166 | } |
7f3c74fb | 3167 | pg_offset = 0; |
d1310b2e CM |
3168 | |
3169 | set_page_extent_mapped(page); | |
3170 | ||
9e487107 JB |
3171 | if (!tree->ops || !tree->ops->fill_delalloc) |
3172 | fill_delalloc = false; | |
3173 | ||
d1310b2e CM |
3174 | delalloc_start = start; |
3175 | delalloc_end = 0; | |
c8b97818 | 3176 | page_started = 0; |
9e487107 | 3177 | if (!epd->extent_locked && fill_delalloc) { |
f85d7d6c | 3178 | u64 delalloc_to_write = 0; |
11c8349b CM |
3179 | /* |
3180 | * make sure the wbc mapping index is at least updated | |
3181 | * to this page. | |
3182 | */ | |
3183 | update_nr_written(page, wbc, 0); | |
3184 | ||
d397712b | 3185 | while (delalloc_end < page_end) { |
771ed689 | 3186 | nr_delalloc = find_lock_delalloc_range(inode, tree, |
c8b97818 CM |
3187 | page, |
3188 | &delalloc_start, | |
d1310b2e CM |
3189 | &delalloc_end, |
3190 | 128 * 1024 * 1024); | |
771ed689 CM |
3191 | if (nr_delalloc == 0) { |
3192 | delalloc_start = delalloc_end + 1; | |
3193 | continue; | |
3194 | } | |
013bd4c3 TI |
3195 | ret = tree->ops->fill_delalloc(inode, page, |
3196 | delalloc_start, | |
3197 | delalloc_end, | |
3198 | &page_started, | |
3199 | &nr_written); | |
79787eaa JM |
3200 | /* File system has been set read-only */ |
3201 | if (ret) { | |
3202 | SetPageError(page); | |
3203 | goto done; | |
3204 | } | |
f85d7d6c CM |
3205 | /* |
3206 | * delalloc_end is already one less than the total | |
3207 | * length, so we don't subtract one from | |
3208 | * PAGE_CACHE_SIZE | |
3209 | */ | |
3210 | delalloc_to_write += (delalloc_end - delalloc_start + | |
3211 | PAGE_CACHE_SIZE) >> | |
3212 | PAGE_CACHE_SHIFT; | |
d1310b2e | 3213 | delalloc_start = delalloc_end + 1; |
d1310b2e | 3214 | } |
f85d7d6c CM |
3215 | if (wbc->nr_to_write < delalloc_to_write) { |
3216 | int thresh = 8192; | |
3217 | ||
3218 | if (delalloc_to_write < thresh * 2) | |
3219 | thresh = delalloc_to_write; | |
3220 | wbc->nr_to_write = min_t(u64, delalloc_to_write, | |
3221 | thresh); | |
3222 | } | |
c8b97818 | 3223 | |
771ed689 CM |
3224 | /* did the fill delalloc function already unlock and start |
3225 | * the IO? | |
3226 | */ | |
3227 | if (page_started) { | |
3228 | ret = 0; | |
11c8349b CM |
3229 | /* |
3230 | * we've unlocked the page, so we can't update | |
3231 | * the mapping's writeback index, just update | |
3232 | * nr_to_write. | |
3233 | */ | |
3234 | wbc->nr_to_write -= nr_written; | |
3235 | goto done_unlocked; | |
771ed689 | 3236 | } |
c8b97818 | 3237 | } |
247e743c | 3238 | if (tree->ops && tree->ops->writepage_start_hook) { |
c8b97818 CM |
3239 | ret = tree->ops->writepage_start_hook(page, start, |
3240 | page_end); | |
87826df0 JM |
3241 | if (ret) { |
3242 | /* Fixup worker will requeue */ | |
3243 | if (ret == -EBUSY) | |
3244 | wbc->pages_skipped++; | |
3245 | else | |
3246 | redirty_page_for_writepage(wbc, page); | |
11c8349b | 3247 | update_nr_written(page, wbc, nr_written); |
247e743c | 3248 | unlock_page(page); |
771ed689 | 3249 | ret = 0; |
11c8349b | 3250 | goto done_unlocked; |
247e743c CM |
3251 | } |
3252 | } | |
3253 | ||
11c8349b CM |
3254 | /* |
3255 | * we don't want to touch the inode after unlocking the page, | |
3256 | * so we update the mapping writeback index now | |
3257 | */ | |
3258 | update_nr_written(page, wbc, nr_written + 1); | |
771ed689 | 3259 | |
d1310b2e | 3260 | end = page_end; |
d1310b2e | 3261 | if (last_byte <= start) { |
e6dcd2dc CM |
3262 | if (tree->ops && tree->ops->writepage_end_io_hook) |
3263 | tree->ops->writepage_end_io_hook(page, start, | |
3264 | page_end, NULL, 1); | |
d1310b2e CM |
3265 | goto done; |
3266 | } | |
3267 | ||
d1310b2e CM |
3268 | blocksize = inode->i_sb->s_blocksize; |
3269 | ||
3270 | while (cur <= end) { | |
3271 | if (cur >= last_byte) { | |
e6dcd2dc CM |
3272 | if (tree->ops && tree->ops->writepage_end_io_hook) |
3273 | tree->ops->writepage_end_io_hook(page, cur, | |
3274 | page_end, NULL, 1); | |
d1310b2e CM |
3275 | break; |
3276 | } | |
7f3c74fb | 3277 | em = epd->get_extent(inode, page, pg_offset, cur, |
d1310b2e | 3278 | end - cur + 1, 1); |
c704005d | 3279 | if (IS_ERR_OR_NULL(em)) { |
d1310b2e CM |
3280 | SetPageError(page); |
3281 | break; | |
3282 | } | |
3283 | ||
3284 | extent_offset = cur - em->start; | |
3285 | BUG_ON(extent_map_end(em) <= cur); | |
3286 | BUG_ON(end < cur); | |
3287 | iosize = min(extent_map_end(em) - cur, end - cur + 1); | |
fda2832f | 3288 | iosize = ALIGN(iosize, blocksize); |
d1310b2e CM |
3289 | sector = (em->block_start + extent_offset) >> 9; |
3290 | bdev = em->bdev; | |
3291 | block_start = em->block_start; | |
c8b97818 | 3292 | compressed = test_bit(EXTENT_FLAG_COMPRESSED, &em->flags); |
d1310b2e CM |
3293 | free_extent_map(em); |
3294 | em = NULL; | |
3295 | ||
c8b97818 CM |
3296 | /* |
3297 | * compressed and inline extents are written through other | |
3298 | * paths in the FS | |
3299 | */ | |
3300 | if (compressed || block_start == EXTENT_MAP_HOLE || | |
d1310b2e | 3301 | block_start == EXTENT_MAP_INLINE) { |
c8b97818 CM |
3302 | /* |
3303 | * end_io notification does not happen here for | |
3304 | * compressed extents | |
3305 | */ | |
3306 | if (!compressed && tree->ops && | |
3307 | tree->ops->writepage_end_io_hook) | |
e6dcd2dc CM |
3308 | tree->ops->writepage_end_io_hook(page, cur, |
3309 | cur + iosize - 1, | |
3310 | NULL, 1); | |
c8b97818 CM |
3311 | else if (compressed) { |
3312 | /* we don't want to end_page_writeback on | |
3313 | * a compressed extent. this happens | |
3314 | * elsewhere | |
3315 | */ | |
3316 | nr++; | |
3317 | } | |
3318 | ||
3319 | cur += iosize; | |
7f3c74fb | 3320 | pg_offset += iosize; |
d1310b2e CM |
3321 | continue; |
3322 | } | |
d1310b2e CM |
3323 | /* leave this out until we have a page_mkwrite call */ |
3324 | if (0 && !test_range_bit(tree, cur, cur + iosize - 1, | |
9655d298 | 3325 | EXTENT_DIRTY, 0, NULL)) { |
d1310b2e | 3326 | cur = cur + iosize; |
7f3c74fb | 3327 | pg_offset += iosize; |
d1310b2e CM |
3328 | continue; |
3329 | } | |
c8b97818 | 3330 | |
d1310b2e CM |
3331 | if (tree->ops && tree->ops->writepage_io_hook) { |
3332 | ret = tree->ops->writepage_io_hook(page, cur, | |
3333 | cur + iosize - 1); | |
3334 | } else { | |
3335 | ret = 0; | |
3336 | } | |
1259ab75 | 3337 | if (ret) { |
d1310b2e | 3338 | SetPageError(page); |
1259ab75 | 3339 | } else { |
d1310b2e | 3340 | unsigned long max_nr = end_index + 1; |
7f3c74fb | 3341 | |
d1310b2e CM |
3342 | set_range_writeback(tree, cur, cur + iosize - 1); |
3343 | if (!PageWriteback(page)) { | |
efe120a0 FH |
3344 | btrfs_err(BTRFS_I(inode)->root->fs_info, |
3345 | "page %lu not writeback, cur %llu end %llu", | |
c1c9ff7c | 3346 | page->index, cur, end); |
d1310b2e CM |
3347 | } |
3348 | ||
ffbd517d CM |
3349 | ret = submit_extent_page(write_flags, tree, page, |
3350 | sector, iosize, pg_offset, | |
3351 | bdev, &epd->bio, max_nr, | |
c8b97818 CM |
3352 | end_bio_extent_writepage, |
3353 | 0, 0, 0); | |
d1310b2e CM |
3354 | if (ret) |
3355 | SetPageError(page); | |
3356 | } | |
3357 | cur = cur + iosize; | |
7f3c74fb | 3358 | pg_offset += iosize; |
d1310b2e CM |
3359 | nr++; |
3360 | } | |
3361 | done: | |
3362 | if (nr == 0) { | |
3363 | /* make sure the mapping tag for page dirty gets cleared */ | |
3364 | set_page_writeback(page); | |
3365 | end_page_writeback(page); | |
3366 | } | |
d1310b2e | 3367 | unlock_page(page); |
771ed689 | 3368 | |
11c8349b CM |
3369 | done_unlocked: |
3370 | ||
2c64c53d CM |
3371 | /* drop our reference on any cached states */ |
3372 | free_extent_state(cached_state); | |
d1310b2e CM |
3373 | return 0; |
3374 | } | |
3375 | ||
0b32f4bb JB |
3376 | static int eb_wait(void *word) |
3377 | { | |
3378 | io_schedule(); | |
3379 | return 0; | |
3380 | } | |
3381 | ||
fd8b2b61 | 3382 | void wait_on_extent_buffer_writeback(struct extent_buffer *eb) |
0b32f4bb JB |
3383 | { |
3384 | wait_on_bit(&eb->bflags, EXTENT_BUFFER_WRITEBACK, eb_wait, | |
3385 | TASK_UNINTERRUPTIBLE); | |
3386 | } | |
3387 | ||
3388 | static int lock_extent_buffer_for_io(struct extent_buffer *eb, | |
3389 | struct btrfs_fs_info *fs_info, | |
3390 | struct extent_page_data *epd) | |
3391 | { | |
3392 | unsigned long i, num_pages; | |
3393 | int flush = 0; | |
3394 | int ret = 0; | |
3395 | ||
3396 | if (!btrfs_try_tree_write_lock(eb)) { | |
3397 | flush = 1; | |
3398 | flush_write_bio(epd); | |
3399 | btrfs_tree_lock(eb); | |
3400 | } | |
3401 | ||
3402 | if (test_bit(EXTENT_BUFFER_WRITEBACK, &eb->bflags)) { | |
3403 | btrfs_tree_unlock(eb); | |
3404 | if (!epd->sync_io) | |
3405 | return 0; | |
3406 | if (!flush) { | |
3407 | flush_write_bio(epd); | |
3408 | flush = 1; | |
3409 | } | |
a098d8e8 CM |
3410 | while (1) { |
3411 | wait_on_extent_buffer_writeback(eb); | |
3412 | btrfs_tree_lock(eb); | |
3413 | if (!test_bit(EXTENT_BUFFER_WRITEBACK, &eb->bflags)) | |
3414 | break; | |
0b32f4bb | 3415 | btrfs_tree_unlock(eb); |
0b32f4bb JB |
3416 | } |
3417 | } | |
3418 | ||
51561ffe JB |
3419 | /* |
3420 | * We need to do this to prevent races in people who check if the eb is | |
3421 | * under IO since we can end up having no IO bits set for a short period | |
3422 | * of time. | |
3423 | */ | |
3424 | spin_lock(&eb->refs_lock); | |
0b32f4bb JB |
3425 | if (test_and_clear_bit(EXTENT_BUFFER_DIRTY, &eb->bflags)) { |
3426 | set_bit(EXTENT_BUFFER_WRITEBACK, &eb->bflags); | |
51561ffe | 3427 | spin_unlock(&eb->refs_lock); |
0b32f4bb | 3428 | btrfs_set_header_flag(eb, BTRFS_HEADER_FLAG_WRITTEN); |
e2d84521 MX |
3429 | __percpu_counter_add(&fs_info->dirty_metadata_bytes, |
3430 | -eb->len, | |
3431 | fs_info->dirty_metadata_batch); | |
0b32f4bb | 3432 | ret = 1; |
51561ffe JB |
3433 | } else { |
3434 | spin_unlock(&eb->refs_lock); | |
0b32f4bb JB |
3435 | } |
3436 | ||
3437 | btrfs_tree_unlock(eb); | |
3438 | ||
3439 | if (!ret) | |
3440 | return ret; | |
3441 | ||
3442 | num_pages = num_extent_pages(eb->start, eb->len); | |
3443 | for (i = 0; i < num_pages; i++) { | |
3444 | struct page *p = extent_buffer_page(eb, i); | |
3445 | ||
3446 | if (!trylock_page(p)) { | |
3447 | if (!flush) { | |
3448 | flush_write_bio(epd); | |
3449 | flush = 1; | |
3450 | } | |
3451 | lock_page(p); | |
3452 | } | |
3453 | } | |
3454 | ||
3455 | return ret; | |
3456 | } | |
3457 | ||
3458 | static void end_extent_buffer_writeback(struct extent_buffer *eb) | |
3459 | { | |
3460 | clear_bit(EXTENT_BUFFER_WRITEBACK, &eb->bflags); | |
3461 | smp_mb__after_clear_bit(); | |
3462 | wake_up_bit(&eb->bflags, EXTENT_BUFFER_WRITEBACK); | |
3463 | } | |
3464 | ||
3465 | static void end_bio_extent_buffer_writepage(struct bio *bio, int err) | |
3466 | { | |
2c30c71b | 3467 | struct bio_vec *bvec; |
0b32f4bb | 3468 | struct extent_buffer *eb; |
2c30c71b | 3469 | int i, done; |
0b32f4bb | 3470 | |
2c30c71b | 3471 | bio_for_each_segment_all(bvec, bio, i) { |
0b32f4bb JB |
3472 | struct page *page = bvec->bv_page; |
3473 | ||
0b32f4bb JB |
3474 | eb = (struct extent_buffer *)page->private; |
3475 | BUG_ON(!eb); | |
3476 | done = atomic_dec_and_test(&eb->io_pages); | |
3477 | ||
2c30c71b | 3478 | if (err || test_bit(EXTENT_BUFFER_IOERR, &eb->bflags)) { |
0b32f4bb JB |
3479 | set_bit(EXTENT_BUFFER_IOERR, &eb->bflags); |
3480 | ClearPageUptodate(page); | |
3481 | SetPageError(page); | |
3482 | } | |
3483 | ||
3484 | end_page_writeback(page); | |
3485 | ||
3486 | if (!done) | |
3487 | continue; | |
3488 | ||
3489 | end_extent_buffer_writeback(eb); | |
2c30c71b | 3490 | } |
0b32f4bb JB |
3491 | |
3492 | bio_put(bio); | |
0b32f4bb JB |
3493 | } |
3494 | ||
3495 | static int write_one_eb(struct extent_buffer *eb, | |
3496 | struct btrfs_fs_info *fs_info, | |
3497 | struct writeback_control *wbc, | |
3498 | struct extent_page_data *epd) | |
3499 | { | |
3500 | struct block_device *bdev = fs_info->fs_devices->latest_bdev; | |
f28491e0 | 3501 | struct extent_io_tree *tree = &BTRFS_I(fs_info->btree_inode)->io_tree; |
0b32f4bb JB |
3502 | u64 offset = eb->start; |
3503 | unsigned long i, num_pages; | |
de0022b9 | 3504 | unsigned long bio_flags = 0; |
d4c7ca86 | 3505 | int rw = (epd->sync_io ? WRITE_SYNC : WRITE) | REQ_META; |
d7dbe9e7 | 3506 | int ret = 0; |
0b32f4bb JB |
3507 | |
3508 | clear_bit(EXTENT_BUFFER_IOERR, &eb->bflags); | |
3509 | num_pages = num_extent_pages(eb->start, eb->len); | |
3510 | atomic_set(&eb->io_pages, num_pages); | |
de0022b9 JB |
3511 | if (btrfs_header_owner(eb) == BTRFS_TREE_LOG_OBJECTID) |
3512 | bio_flags = EXTENT_BIO_TREE_LOG; | |
3513 | ||
0b32f4bb JB |
3514 | for (i = 0; i < num_pages; i++) { |
3515 | struct page *p = extent_buffer_page(eb, i); | |
3516 | ||
3517 | clear_page_dirty_for_io(p); | |
3518 | set_page_writeback(p); | |
f28491e0 | 3519 | ret = submit_extent_page(rw, tree, p, offset >> 9, |
0b32f4bb JB |
3520 | PAGE_CACHE_SIZE, 0, bdev, &epd->bio, |
3521 | -1, end_bio_extent_buffer_writepage, | |
de0022b9 JB |
3522 | 0, epd->bio_flags, bio_flags); |
3523 | epd->bio_flags = bio_flags; | |
0b32f4bb JB |
3524 | if (ret) { |
3525 | set_bit(EXTENT_BUFFER_IOERR, &eb->bflags); | |
3526 | SetPageError(p); | |
3527 | if (atomic_sub_and_test(num_pages - i, &eb->io_pages)) | |
3528 | end_extent_buffer_writeback(eb); | |
3529 | ret = -EIO; | |
3530 | break; | |
3531 | } | |
3532 | offset += PAGE_CACHE_SIZE; | |
3533 | update_nr_written(p, wbc, 1); | |
3534 | unlock_page(p); | |
3535 | } | |
3536 | ||
3537 | if (unlikely(ret)) { | |
3538 | for (; i < num_pages; i++) { | |
3539 | struct page *p = extent_buffer_page(eb, i); | |
3540 | unlock_page(p); | |
3541 | } | |
3542 | } | |
3543 | ||
3544 | return ret; | |
3545 | } | |
3546 | ||
3547 | int btree_write_cache_pages(struct address_space *mapping, | |
3548 | struct writeback_control *wbc) | |
3549 | { | |
3550 | struct extent_io_tree *tree = &BTRFS_I(mapping->host)->io_tree; | |
3551 | struct btrfs_fs_info *fs_info = BTRFS_I(mapping->host)->root->fs_info; | |
3552 | struct extent_buffer *eb, *prev_eb = NULL; | |
3553 | struct extent_page_data epd = { | |
3554 | .bio = NULL, | |
3555 | .tree = tree, | |
3556 | .extent_locked = 0, | |
3557 | .sync_io = wbc->sync_mode == WB_SYNC_ALL, | |
de0022b9 | 3558 | .bio_flags = 0, |
0b32f4bb JB |
3559 | }; |
3560 | int ret = 0; | |
3561 | int done = 0; | |
3562 | int nr_to_write_done = 0; | |
3563 | struct pagevec pvec; | |
3564 | int nr_pages; | |
3565 | pgoff_t index; | |
3566 | pgoff_t end; /* Inclusive */ | |
3567 | int scanned = 0; | |
3568 | int tag; | |
3569 | ||
3570 | pagevec_init(&pvec, 0); | |
3571 | if (wbc->range_cyclic) { | |
3572 | index = mapping->writeback_index; /* Start from prev offset */ | |
3573 | end = -1; | |
3574 | } else { | |
3575 | index = wbc->range_start >> PAGE_CACHE_SHIFT; | |
3576 | end = wbc->range_end >> PAGE_CACHE_SHIFT; | |
3577 | scanned = 1; | |
3578 | } | |
3579 | if (wbc->sync_mode == WB_SYNC_ALL) | |
3580 | tag = PAGECACHE_TAG_TOWRITE; | |
3581 | else | |
3582 | tag = PAGECACHE_TAG_DIRTY; | |
3583 | retry: | |
3584 | if (wbc->sync_mode == WB_SYNC_ALL) | |
3585 | tag_pages_for_writeback(mapping, index, end); | |
3586 | while (!done && !nr_to_write_done && (index <= end) && | |
3587 | (nr_pages = pagevec_lookup_tag(&pvec, mapping, &index, tag, | |
3588 | min(end - index, (pgoff_t)PAGEVEC_SIZE-1) + 1))) { | |
3589 | unsigned i; | |
3590 | ||
3591 | scanned = 1; | |
3592 | for (i = 0; i < nr_pages; i++) { | |
3593 | struct page *page = pvec.pages[i]; | |
3594 | ||
3595 | if (!PagePrivate(page)) | |
3596 | continue; | |
3597 | ||
3598 | if (!wbc->range_cyclic && page->index > end) { | |
3599 | done = 1; | |
3600 | break; | |
3601 | } | |
3602 | ||
b5bae261 JB |
3603 | spin_lock(&mapping->private_lock); |
3604 | if (!PagePrivate(page)) { | |
3605 | spin_unlock(&mapping->private_lock); | |
3606 | continue; | |
3607 | } | |
3608 | ||
0b32f4bb | 3609 | eb = (struct extent_buffer *)page->private; |
b5bae261 JB |
3610 | |
3611 | /* | |
3612 | * Shouldn't happen and normally this would be a BUG_ON | |
3613 | * but no sense in crashing the users box for something | |
3614 | * we can survive anyway. | |
3615 | */ | |
fae7f21c | 3616 | if (WARN_ON(!eb)) { |
b5bae261 | 3617 | spin_unlock(&mapping->private_lock); |
0b32f4bb JB |
3618 | continue; |
3619 | } | |
3620 | ||
b5bae261 JB |
3621 | if (eb == prev_eb) { |
3622 | spin_unlock(&mapping->private_lock); | |
0b32f4bb | 3623 | continue; |
b5bae261 | 3624 | } |
0b32f4bb | 3625 | |
b5bae261 JB |
3626 | ret = atomic_inc_not_zero(&eb->refs); |
3627 | spin_unlock(&mapping->private_lock); | |
3628 | if (!ret) | |
0b32f4bb | 3629 | continue; |
0b32f4bb JB |
3630 | |
3631 | prev_eb = eb; | |
3632 | ret = lock_extent_buffer_for_io(eb, fs_info, &epd); | |
3633 | if (!ret) { | |
3634 | free_extent_buffer(eb); | |
3635 | continue; | |
3636 | } | |
3637 | ||
3638 | ret = write_one_eb(eb, fs_info, wbc, &epd); | |
3639 | if (ret) { | |
3640 | done = 1; | |
3641 | free_extent_buffer(eb); | |
3642 | break; | |
3643 | } | |
3644 | free_extent_buffer(eb); | |
3645 | ||
3646 | /* | |
3647 | * the filesystem may choose to bump up nr_to_write. | |
3648 | * We have to make sure to honor the new nr_to_write | |
3649 | * at any time | |
3650 | */ | |
3651 | nr_to_write_done = wbc->nr_to_write <= 0; | |
3652 | } | |
3653 | pagevec_release(&pvec); | |
3654 | cond_resched(); | |
3655 | } | |
3656 | if (!scanned && !done) { | |
3657 | /* | |
3658 | * We hit the last page and there is more work to be done: wrap | |
3659 | * back to the start of the file | |
3660 | */ | |
3661 | scanned = 1; | |
3662 | index = 0; | |
3663 | goto retry; | |
3664 | } | |
3665 | flush_write_bio(&epd); | |
3666 | return ret; | |
3667 | } | |
3668 | ||
d1310b2e | 3669 | /** |
4bef0848 | 3670 | * write_cache_pages - walk the list of dirty pages of the given address space and write all of them. |
d1310b2e CM |
3671 | * @mapping: address space structure to write |
3672 | * @wbc: subtract the number of written pages from *@wbc->nr_to_write | |
3673 | * @writepage: function called for each page | |
3674 | * @data: data passed to writepage function | |
3675 | * | |
3676 | * If a page is already under I/O, write_cache_pages() skips it, even | |
3677 | * if it's dirty. This is desirable behaviour for memory-cleaning writeback, | |
3678 | * but it is INCORRECT for data-integrity system calls such as fsync(). fsync() | |
3679 | * and msync() need to guarantee that all the data which was dirty at the time | |
3680 | * the call was made get new I/O started against them. If wbc->sync_mode is | |
3681 | * WB_SYNC_ALL then we were called for data integrity and we must wait for | |
3682 | * existing IO to complete. | |
3683 | */ | |
b2950863 | 3684 | static int extent_write_cache_pages(struct extent_io_tree *tree, |
4bef0848 CM |
3685 | struct address_space *mapping, |
3686 | struct writeback_control *wbc, | |
d2c3f4f6 CM |
3687 | writepage_t writepage, void *data, |
3688 | void (*flush_fn)(void *)) | |
d1310b2e | 3689 | { |
7fd1a3f7 | 3690 | struct inode *inode = mapping->host; |
d1310b2e CM |
3691 | int ret = 0; |
3692 | int done = 0; | |
f85d7d6c | 3693 | int nr_to_write_done = 0; |
d1310b2e CM |
3694 | struct pagevec pvec; |
3695 | int nr_pages; | |
3696 | pgoff_t index; | |
3697 | pgoff_t end; /* Inclusive */ | |
3698 | int scanned = 0; | |
f7aaa06b | 3699 | int tag; |
d1310b2e | 3700 | |
7fd1a3f7 JB |
3701 | /* |
3702 | * We have to hold onto the inode so that ordered extents can do their | |
3703 | * work when the IO finishes. The alternative to this is failing to add | |
3704 | * an ordered extent if the igrab() fails there and that is a huge pain | |
3705 | * to deal with, so instead just hold onto the inode throughout the | |
3706 | * writepages operation. If it fails here we are freeing up the inode | |
3707 | * anyway and we'd rather not waste our time writing out stuff that is | |
3708 | * going to be truncated anyway. | |
3709 | */ | |
3710 | if (!igrab(inode)) | |
3711 | return 0; | |
3712 | ||
d1310b2e CM |
3713 | pagevec_init(&pvec, 0); |
3714 | if (wbc->range_cyclic) { | |
3715 | index = mapping->writeback_index; /* Start from prev offset */ | |
3716 | end = -1; | |
3717 | } else { | |
3718 | index = wbc->range_start >> PAGE_CACHE_SHIFT; | |
3719 | end = wbc->range_end >> PAGE_CACHE_SHIFT; | |
d1310b2e CM |
3720 | scanned = 1; |
3721 | } | |
f7aaa06b JB |
3722 | if (wbc->sync_mode == WB_SYNC_ALL) |
3723 | tag = PAGECACHE_TAG_TOWRITE; | |
3724 | else | |
3725 | tag = PAGECACHE_TAG_DIRTY; | |
d1310b2e | 3726 | retry: |
f7aaa06b JB |
3727 | if (wbc->sync_mode == WB_SYNC_ALL) |
3728 | tag_pages_for_writeback(mapping, index, end); | |
f85d7d6c | 3729 | while (!done && !nr_to_write_done && (index <= end) && |
f7aaa06b JB |
3730 | (nr_pages = pagevec_lookup_tag(&pvec, mapping, &index, tag, |
3731 | min(end - index, (pgoff_t)PAGEVEC_SIZE-1) + 1))) { | |
d1310b2e CM |
3732 | unsigned i; |
3733 | ||
3734 | scanned = 1; | |
3735 | for (i = 0; i < nr_pages; i++) { | |
3736 | struct page *page = pvec.pages[i]; | |
3737 | ||
3738 | /* | |
3739 | * At this point we hold neither mapping->tree_lock nor | |
3740 | * lock on the page itself: the page may be truncated or | |
3741 | * invalidated (changing page->mapping to NULL), or even | |
3742 | * swizzled back from swapper_space to tmpfs file | |
3743 | * mapping | |
3744 | */ | |
c8f2f24b JB |
3745 | if (!trylock_page(page)) { |
3746 | flush_fn(data); | |
3747 | lock_page(page); | |
01d658f2 | 3748 | } |
d1310b2e CM |
3749 | |
3750 | if (unlikely(page->mapping != mapping)) { | |
3751 | unlock_page(page); | |
3752 | continue; | |
3753 | } | |
3754 | ||
3755 | if (!wbc->range_cyclic && page->index > end) { | |
3756 | done = 1; | |
3757 | unlock_page(page); | |
3758 | continue; | |
3759 | } | |
3760 | ||
d2c3f4f6 | 3761 | if (wbc->sync_mode != WB_SYNC_NONE) { |
0e6bd956 CM |
3762 | if (PageWriteback(page)) |
3763 | flush_fn(data); | |
d1310b2e | 3764 | wait_on_page_writeback(page); |
d2c3f4f6 | 3765 | } |
d1310b2e CM |
3766 | |
3767 | if (PageWriteback(page) || | |
3768 | !clear_page_dirty_for_io(page)) { | |
3769 | unlock_page(page); | |
3770 | continue; | |
3771 | } | |
3772 | ||
3773 | ret = (*writepage)(page, wbc, data); | |
3774 | ||
3775 | if (unlikely(ret == AOP_WRITEPAGE_ACTIVATE)) { | |
3776 | unlock_page(page); | |
3777 | ret = 0; | |
3778 | } | |
f85d7d6c | 3779 | if (ret) |
d1310b2e | 3780 | done = 1; |
f85d7d6c CM |
3781 | |
3782 | /* | |
3783 | * the filesystem may choose to bump up nr_to_write. | |
3784 | * We have to make sure to honor the new nr_to_write | |
3785 | * at any time | |
3786 | */ | |
3787 | nr_to_write_done = wbc->nr_to_write <= 0; | |
d1310b2e CM |
3788 | } |
3789 | pagevec_release(&pvec); | |
3790 | cond_resched(); | |
3791 | } | |
3792 | if (!scanned && !done) { | |
3793 | /* | |
3794 | * We hit the last page and there is more work to be done: wrap | |
3795 | * back to the start of the file | |
3796 | */ | |
3797 | scanned = 1; | |
3798 | index = 0; | |
3799 | goto retry; | |
3800 | } | |
7fd1a3f7 | 3801 | btrfs_add_delayed_iput(inode); |
d1310b2e CM |
3802 | return ret; |
3803 | } | |
d1310b2e | 3804 | |
ffbd517d | 3805 | static void flush_epd_write_bio(struct extent_page_data *epd) |
d2c3f4f6 | 3806 | { |
d2c3f4f6 | 3807 | if (epd->bio) { |
355808c2 JM |
3808 | int rw = WRITE; |
3809 | int ret; | |
3810 | ||
ffbd517d | 3811 | if (epd->sync_io) |
355808c2 JM |
3812 | rw = WRITE_SYNC; |
3813 | ||
de0022b9 | 3814 | ret = submit_one_bio(rw, epd->bio, 0, epd->bio_flags); |
79787eaa | 3815 | BUG_ON(ret < 0); /* -ENOMEM */ |
d2c3f4f6 CM |
3816 | epd->bio = NULL; |
3817 | } | |
3818 | } | |
3819 | ||
ffbd517d CM |
3820 | static noinline void flush_write_bio(void *data) |
3821 | { | |
3822 | struct extent_page_data *epd = data; | |
3823 | flush_epd_write_bio(epd); | |
3824 | } | |
3825 | ||
d1310b2e CM |
3826 | int extent_write_full_page(struct extent_io_tree *tree, struct page *page, |
3827 | get_extent_t *get_extent, | |
3828 | struct writeback_control *wbc) | |
3829 | { | |
3830 | int ret; | |
d1310b2e CM |
3831 | struct extent_page_data epd = { |
3832 | .bio = NULL, | |
3833 | .tree = tree, | |
3834 | .get_extent = get_extent, | |
771ed689 | 3835 | .extent_locked = 0, |
ffbd517d | 3836 | .sync_io = wbc->sync_mode == WB_SYNC_ALL, |
de0022b9 | 3837 | .bio_flags = 0, |
d1310b2e | 3838 | }; |
d1310b2e | 3839 | |
d1310b2e CM |
3840 | ret = __extent_writepage(page, wbc, &epd); |
3841 | ||
ffbd517d | 3842 | flush_epd_write_bio(&epd); |
d1310b2e CM |
3843 | return ret; |
3844 | } | |
d1310b2e | 3845 | |
771ed689 CM |
3846 | int extent_write_locked_range(struct extent_io_tree *tree, struct inode *inode, |
3847 | u64 start, u64 end, get_extent_t *get_extent, | |
3848 | int mode) | |
3849 | { | |
3850 | int ret = 0; | |
3851 | struct address_space *mapping = inode->i_mapping; | |
3852 | struct page *page; | |
3853 | unsigned long nr_pages = (end - start + PAGE_CACHE_SIZE) >> | |
3854 | PAGE_CACHE_SHIFT; | |
3855 | ||
3856 | struct extent_page_data epd = { | |
3857 | .bio = NULL, | |
3858 | .tree = tree, | |
3859 | .get_extent = get_extent, | |
3860 | .extent_locked = 1, | |
ffbd517d | 3861 | .sync_io = mode == WB_SYNC_ALL, |
de0022b9 | 3862 | .bio_flags = 0, |
771ed689 CM |
3863 | }; |
3864 | struct writeback_control wbc_writepages = { | |
771ed689 | 3865 | .sync_mode = mode, |
771ed689 CM |
3866 | .nr_to_write = nr_pages * 2, |
3867 | .range_start = start, | |
3868 | .range_end = end + 1, | |
3869 | }; | |
3870 | ||
d397712b | 3871 | while (start <= end) { |
771ed689 CM |
3872 | page = find_get_page(mapping, start >> PAGE_CACHE_SHIFT); |
3873 | if (clear_page_dirty_for_io(page)) | |
3874 | ret = __extent_writepage(page, &wbc_writepages, &epd); | |
3875 | else { | |
3876 | if (tree->ops && tree->ops->writepage_end_io_hook) | |
3877 | tree->ops->writepage_end_io_hook(page, start, | |
3878 | start + PAGE_CACHE_SIZE - 1, | |
3879 | NULL, 1); | |
3880 | unlock_page(page); | |
3881 | } | |
3882 | page_cache_release(page); | |
3883 | start += PAGE_CACHE_SIZE; | |
3884 | } | |
3885 | ||
ffbd517d | 3886 | flush_epd_write_bio(&epd); |
771ed689 CM |
3887 | return ret; |
3888 | } | |
d1310b2e CM |
3889 | |
3890 | int extent_writepages(struct extent_io_tree *tree, | |
3891 | struct address_space *mapping, | |
3892 | get_extent_t *get_extent, | |
3893 | struct writeback_control *wbc) | |
3894 | { | |
3895 | int ret = 0; | |
3896 | struct extent_page_data epd = { | |
3897 | .bio = NULL, | |
3898 | .tree = tree, | |
3899 | .get_extent = get_extent, | |
771ed689 | 3900 | .extent_locked = 0, |
ffbd517d | 3901 | .sync_io = wbc->sync_mode == WB_SYNC_ALL, |
de0022b9 | 3902 | .bio_flags = 0, |
d1310b2e CM |
3903 | }; |
3904 | ||
4bef0848 | 3905 | ret = extent_write_cache_pages(tree, mapping, wbc, |
d2c3f4f6 CM |
3906 | __extent_writepage, &epd, |
3907 | flush_write_bio); | |
ffbd517d | 3908 | flush_epd_write_bio(&epd); |
d1310b2e CM |
3909 | return ret; |
3910 | } | |
d1310b2e CM |
3911 | |
3912 | int extent_readpages(struct extent_io_tree *tree, | |
3913 | struct address_space *mapping, | |
3914 | struct list_head *pages, unsigned nr_pages, | |
3915 | get_extent_t get_extent) | |
3916 | { | |
3917 | struct bio *bio = NULL; | |
3918 | unsigned page_idx; | |
c8b97818 | 3919 | unsigned long bio_flags = 0; |
67c9684f LB |
3920 | struct page *pagepool[16]; |
3921 | struct page *page; | |
125bac01 | 3922 | struct extent_map *em_cached = NULL; |
67c9684f | 3923 | int nr = 0; |
d1310b2e | 3924 | |
d1310b2e | 3925 | for (page_idx = 0; page_idx < nr_pages; page_idx++) { |
67c9684f | 3926 | page = list_entry(pages->prev, struct page, lru); |
d1310b2e CM |
3927 | |
3928 | prefetchw(&page->flags); | |
3929 | list_del(&page->lru); | |
67c9684f | 3930 | if (add_to_page_cache_lru(page, mapping, |
43e817a1 | 3931 | page->index, GFP_NOFS)) { |
67c9684f LB |
3932 | page_cache_release(page); |
3933 | continue; | |
d1310b2e | 3934 | } |
67c9684f LB |
3935 | |
3936 | pagepool[nr++] = page; | |
3937 | if (nr < ARRAY_SIZE(pagepool)) | |
3938 | continue; | |
125bac01 | 3939 | __extent_readpages(tree, pagepool, nr, get_extent, &em_cached, |
9974090b | 3940 | &bio, 0, &bio_flags, READ); |
67c9684f | 3941 | nr = 0; |
d1310b2e | 3942 | } |
9974090b | 3943 | if (nr) |
125bac01 | 3944 | __extent_readpages(tree, pagepool, nr, get_extent, &em_cached, |
9974090b | 3945 | &bio, 0, &bio_flags, READ); |
67c9684f | 3946 | |
125bac01 MX |
3947 | if (em_cached) |
3948 | free_extent_map(em_cached); | |
3949 | ||
d1310b2e CM |
3950 | BUG_ON(!list_empty(pages)); |
3951 | if (bio) | |
79787eaa | 3952 | return submit_one_bio(READ, bio, 0, bio_flags); |
d1310b2e CM |
3953 | return 0; |
3954 | } | |
d1310b2e CM |
3955 | |
3956 | /* | |
3957 | * basic invalidatepage code, this waits on any locked or writeback | |
3958 | * ranges corresponding to the page, and then deletes any extent state | |
3959 | * records from the tree | |
3960 | */ | |
3961 | int extent_invalidatepage(struct extent_io_tree *tree, | |
3962 | struct page *page, unsigned long offset) | |
3963 | { | |
2ac55d41 | 3964 | struct extent_state *cached_state = NULL; |
4eee4fa4 | 3965 | u64 start = page_offset(page); |
d1310b2e CM |
3966 | u64 end = start + PAGE_CACHE_SIZE - 1; |
3967 | size_t blocksize = page->mapping->host->i_sb->s_blocksize; | |
3968 | ||
fda2832f | 3969 | start += ALIGN(offset, blocksize); |
d1310b2e CM |
3970 | if (start > end) |
3971 | return 0; | |
3972 | ||
d0082371 | 3973 | lock_extent_bits(tree, start, end, 0, &cached_state); |
1edbb734 | 3974 | wait_on_page_writeback(page); |
d1310b2e | 3975 | clear_extent_bit(tree, start, end, |
32c00aff JB |
3976 | EXTENT_LOCKED | EXTENT_DIRTY | EXTENT_DELALLOC | |
3977 | EXTENT_DO_ACCOUNTING, | |
2ac55d41 | 3978 | 1, 1, &cached_state, GFP_NOFS); |
d1310b2e CM |
3979 | return 0; |
3980 | } | |
d1310b2e | 3981 | |
7b13b7b1 CM |
3982 | /* |
3983 | * a helper for releasepage, this tests for areas of the page that | |
3984 | * are locked or under IO and drops the related state bits if it is safe | |
3985 | * to drop the page. | |
3986 | */ | |
48a3b636 ES |
3987 | static int try_release_extent_state(struct extent_map_tree *map, |
3988 | struct extent_io_tree *tree, | |
3989 | struct page *page, gfp_t mask) | |
7b13b7b1 | 3990 | { |
4eee4fa4 | 3991 | u64 start = page_offset(page); |
7b13b7b1 CM |
3992 | u64 end = start + PAGE_CACHE_SIZE - 1; |
3993 | int ret = 1; | |
3994 | ||
211f90e6 | 3995 | if (test_range_bit(tree, start, end, |
8b62b72b | 3996 | EXTENT_IOBITS, 0, NULL)) |
7b13b7b1 CM |
3997 | ret = 0; |
3998 | else { | |
3999 | if ((mask & GFP_NOFS) == GFP_NOFS) | |
4000 | mask = GFP_NOFS; | |
11ef160f CM |
4001 | /* |
4002 | * at this point we can safely clear everything except the | |
4003 | * locked bit and the nodatasum bit | |
4004 | */ | |
e3f24cc5 | 4005 | ret = clear_extent_bit(tree, start, end, |
11ef160f CM |
4006 | ~(EXTENT_LOCKED | EXTENT_NODATASUM), |
4007 | 0, 0, NULL, mask); | |
e3f24cc5 CM |
4008 | |
4009 | /* if clear_extent_bit failed for enomem reasons, | |
4010 | * we can't allow the release to continue. | |
4011 | */ | |
4012 | if (ret < 0) | |
4013 | ret = 0; | |
4014 | else | |
4015 | ret = 1; | |
7b13b7b1 CM |
4016 | } |
4017 | return ret; | |
4018 | } | |
7b13b7b1 | 4019 | |
d1310b2e CM |
4020 | /* |
4021 | * a helper for releasepage. As long as there are no locked extents | |
4022 | * in the range corresponding to the page, both state records and extent | |
4023 | * map records are removed | |
4024 | */ | |
4025 | int try_release_extent_mapping(struct extent_map_tree *map, | |
70dec807 CM |
4026 | struct extent_io_tree *tree, struct page *page, |
4027 | gfp_t mask) | |
d1310b2e CM |
4028 | { |
4029 | struct extent_map *em; | |
4eee4fa4 | 4030 | u64 start = page_offset(page); |
d1310b2e | 4031 | u64 end = start + PAGE_CACHE_SIZE - 1; |
7b13b7b1 | 4032 | |
70dec807 CM |
4033 | if ((mask & __GFP_WAIT) && |
4034 | page->mapping->host->i_size > 16 * 1024 * 1024) { | |
39b5637f | 4035 | u64 len; |
70dec807 | 4036 | while (start <= end) { |
39b5637f | 4037 | len = end - start + 1; |
890871be | 4038 | write_lock(&map->lock); |
39b5637f | 4039 | em = lookup_extent_mapping(map, start, len); |
285190d9 | 4040 | if (!em) { |
890871be | 4041 | write_unlock(&map->lock); |
70dec807 CM |
4042 | break; |
4043 | } | |
7f3c74fb CM |
4044 | if (test_bit(EXTENT_FLAG_PINNED, &em->flags) || |
4045 | em->start != start) { | |
890871be | 4046 | write_unlock(&map->lock); |
70dec807 CM |
4047 | free_extent_map(em); |
4048 | break; | |
4049 | } | |
4050 | if (!test_range_bit(tree, em->start, | |
4051 | extent_map_end(em) - 1, | |
8b62b72b | 4052 | EXTENT_LOCKED | EXTENT_WRITEBACK, |
9655d298 | 4053 | 0, NULL)) { |
70dec807 CM |
4054 | remove_extent_mapping(map, em); |
4055 | /* once for the rb tree */ | |
4056 | free_extent_map(em); | |
4057 | } | |
4058 | start = extent_map_end(em); | |
890871be | 4059 | write_unlock(&map->lock); |
70dec807 CM |
4060 | |
4061 | /* once for us */ | |
d1310b2e CM |
4062 | free_extent_map(em); |
4063 | } | |
d1310b2e | 4064 | } |
7b13b7b1 | 4065 | return try_release_extent_state(map, tree, page, mask); |
d1310b2e | 4066 | } |
d1310b2e | 4067 | |
ec29ed5b CM |
4068 | /* |
4069 | * helper function for fiemap, which doesn't want to see any holes. | |
4070 | * This maps until we find something past 'last' | |
4071 | */ | |
4072 | static struct extent_map *get_extent_skip_holes(struct inode *inode, | |
4073 | u64 offset, | |
4074 | u64 last, | |
4075 | get_extent_t *get_extent) | |
4076 | { | |
4077 | u64 sectorsize = BTRFS_I(inode)->root->sectorsize; | |
4078 | struct extent_map *em; | |
4079 | u64 len; | |
4080 | ||
4081 | if (offset >= last) | |
4082 | return NULL; | |
4083 | ||
67871254 | 4084 | while (1) { |
ec29ed5b CM |
4085 | len = last - offset; |
4086 | if (len == 0) | |
4087 | break; | |
fda2832f | 4088 | len = ALIGN(len, sectorsize); |
ec29ed5b | 4089 | em = get_extent(inode, NULL, 0, offset, len, 0); |
c704005d | 4090 | if (IS_ERR_OR_NULL(em)) |
ec29ed5b CM |
4091 | return em; |
4092 | ||
4093 | /* if this isn't a hole return it */ | |
4094 | if (!test_bit(EXTENT_FLAG_VACANCY, &em->flags) && | |
4095 | em->block_start != EXTENT_MAP_HOLE) { | |
4096 | return em; | |
4097 | } | |
4098 | ||
4099 | /* this is a hole, advance to the next extent */ | |
4100 | offset = extent_map_end(em); | |
4101 | free_extent_map(em); | |
4102 | if (offset >= last) | |
4103 | break; | |
4104 | } | |
4105 | return NULL; | |
4106 | } | |
4107 | ||
fe09e16c LB |
4108 | static noinline int count_ext_ref(u64 inum, u64 offset, u64 root_id, void *ctx) |
4109 | { | |
4110 | unsigned long cnt = *((unsigned long *)ctx); | |
4111 | ||
4112 | cnt++; | |
4113 | *((unsigned long *)ctx) = cnt; | |
4114 | ||
4115 | /* Now we're sure that the extent is shared. */ | |
4116 | if (cnt > 1) | |
4117 | return 1; | |
4118 | return 0; | |
4119 | } | |
4120 | ||
1506fcc8 YS |
4121 | int extent_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, |
4122 | __u64 start, __u64 len, get_extent_t *get_extent) | |
4123 | { | |
975f84fe | 4124 | int ret = 0; |
1506fcc8 YS |
4125 | u64 off = start; |
4126 | u64 max = start + len; | |
4127 | u32 flags = 0; | |
975f84fe JB |
4128 | u32 found_type; |
4129 | u64 last; | |
ec29ed5b | 4130 | u64 last_for_get_extent = 0; |
1506fcc8 | 4131 | u64 disko = 0; |
ec29ed5b | 4132 | u64 isize = i_size_read(inode); |
975f84fe | 4133 | struct btrfs_key found_key; |
1506fcc8 | 4134 | struct extent_map *em = NULL; |
2ac55d41 | 4135 | struct extent_state *cached_state = NULL; |
975f84fe | 4136 | struct btrfs_path *path; |
1506fcc8 | 4137 | int end = 0; |
ec29ed5b CM |
4138 | u64 em_start = 0; |
4139 | u64 em_len = 0; | |
4140 | u64 em_end = 0; | |
1506fcc8 YS |
4141 | |
4142 | if (len == 0) | |
4143 | return -EINVAL; | |
4144 | ||
975f84fe JB |
4145 | path = btrfs_alloc_path(); |
4146 | if (!path) | |
4147 | return -ENOMEM; | |
4148 | path->leave_spinning = 1; | |
4149 | ||
4d479cf0 JB |
4150 | start = ALIGN(start, BTRFS_I(inode)->root->sectorsize); |
4151 | len = ALIGN(len, BTRFS_I(inode)->root->sectorsize); | |
4152 | ||
ec29ed5b CM |
4153 | /* |
4154 | * lookup the last file extent. We're not using i_size here | |
4155 | * because there might be preallocation past i_size | |
4156 | */ | |
975f84fe | 4157 | ret = btrfs_lookup_file_extent(NULL, BTRFS_I(inode)->root, |
33345d01 | 4158 | path, btrfs_ino(inode), -1, 0); |
975f84fe JB |
4159 | if (ret < 0) { |
4160 | btrfs_free_path(path); | |
4161 | return ret; | |
4162 | } | |
4163 | WARN_ON(!ret); | |
4164 | path->slots[0]--; | |
975f84fe JB |
4165 | btrfs_item_key_to_cpu(path->nodes[0], &found_key, path->slots[0]); |
4166 | found_type = btrfs_key_type(&found_key); | |
4167 | ||
ec29ed5b | 4168 | /* No extents, but there might be delalloc bits */ |
33345d01 | 4169 | if (found_key.objectid != btrfs_ino(inode) || |
975f84fe | 4170 | found_type != BTRFS_EXTENT_DATA_KEY) { |
ec29ed5b CM |
4171 | /* have to trust i_size as the end */ |
4172 | last = (u64)-1; | |
4173 | last_for_get_extent = isize; | |
4174 | } else { | |
4175 | /* | |
4176 | * remember the start of the last extent. There are a | |
4177 | * bunch of different factors that go into the length of the | |
4178 | * extent, so its much less complex to remember where it started | |
4179 | */ | |
4180 | last = found_key.offset; | |
4181 | last_for_get_extent = last + 1; | |
975f84fe | 4182 | } |
fe09e16c | 4183 | btrfs_release_path(path); |
975f84fe | 4184 | |
ec29ed5b CM |
4185 | /* |
4186 | * we might have some extents allocated but more delalloc past those | |
4187 | * extents. so, we trust isize unless the start of the last extent is | |
4188 | * beyond isize | |
4189 | */ | |
4190 | if (last < isize) { | |
4191 | last = (u64)-1; | |
4192 | last_for_get_extent = isize; | |
4193 | } | |
4194 | ||
a52f4cd2 | 4195 | lock_extent_bits(&BTRFS_I(inode)->io_tree, start, start + len - 1, 0, |
d0082371 | 4196 | &cached_state); |
ec29ed5b | 4197 | |
4d479cf0 | 4198 | em = get_extent_skip_holes(inode, start, last_for_get_extent, |
ec29ed5b | 4199 | get_extent); |
1506fcc8 YS |
4200 | if (!em) |
4201 | goto out; | |
4202 | if (IS_ERR(em)) { | |
4203 | ret = PTR_ERR(em); | |
4204 | goto out; | |
4205 | } | |
975f84fe | 4206 | |
1506fcc8 | 4207 | while (!end) { |
b76bb701 | 4208 | u64 offset_in_extent = 0; |
ea8efc74 CM |
4209 | |
4210 | /* break if the extent we found is outside the range */ | |
4211 | if (em->start >= max || extent_map_end(em) < off) | |
4212 | break; | |
4213 | ||
4214 | /* | |
4215 | * get_extent may return an extent that starts before our | |
4216 | * requested range. We have to make sure the ranges | |
4217 | * we return to fiemap always move forward and don't | |
4218 | * overlap, so adjust the offsets here | |
4219 | */ | |
4220 | em_start = max(em->start, off); | |
1506fcc8 | 4221 | |
ea8efc74 CM |
4222 | /* |
4223 | * record the offset from the start of the extent | |
b76bb701 JB |
4224 | * for adjusting the disk offset below. Only do this if the |
4225 | * extent isn't compressed since our in ram offset may be past | |
4226 | * what we have actually allocated on disk. | |
ea8efc74 | 4227 | */ |
b76bb701 JB |
4228 | if (!test_bit(EXTENT_FLAG_COMPRESSED, &em->flags)) |
4229 | offset_in_extent = em_start - em->start; | |
ec29ed5b | 4230 | em_end = extent_map_end(em); |
ea8efc74 | 4231 | em_len = em_end - em_start; |
1506fcc8 YS |
4232 | disko = 0; |
4233 | flags = 0; | |
4234 | ||
ea8efc74 CM |
4235 | /* |
4236 | * bump off for our next call to get_extent | |
4237 | */ | |
4238 | off = extent_map_end(em); | |
4239 | if (off >= max) | |
4240 | end = 1; | |
4241 | ||
93dbfad7 | 4242 | if (em->block_start == EXTENT_MAP_LAST_BYTE) { |
1506fcc8 YS |
4243 | end = 1; |
4244 | flags |= FIEMAP_EXTENT_LAST; | |
93dbfad7 | 4245 | } else if (em->block_start == EXTENT_MAP_INLINE) { |
1506fcc8 YS |
4246 | flags |= (FIEMAP_EXTENT_DATA_INLINE | |
4247 | FIEMAP_EXTENT_NOT_ALIGNED); | |
93dbfad7 | 4248 | } else if (em->block_start == EXTENT_MAP_DELALLOC) { |
1506fcc8 YS |
4249 | flags |= (FIEMAP_EXTENT_DELALLOC | |
4250 | FIEMAP_EXTENT_UNKNOWN); | |
93dbfad7 | 4251 | } else { |
fe09e16c LB |
4252 | unsigned long ref_cnt = 0; |
4253 | ||
ea8efc74 | 4254 | disko = em->block_start + offset_in_extent; |
fe09e16c LB |
4255 | |
4256 | /* | |
4257 | * As btrfs supports shared space, this information | |
4258 | * can be exported to userspace tools via | |
4259 | * flag FIEMAP_EXTENT_SHARED. | |
4260 | */ | |
4261 | ret = iterate_inodes_from_logical( | |
4262 | em->block_start, | |
4263 | BTRFS_I(inode)->root->fs_info, | |
4264 | path, count_ext_ref, &ref_cnt); | |
4265 | if (ret < 0 && ret != -ENOENT) | |
4266 | goto out_free; | |
4267 | ||
4268 | if (ref_cnt > 1) | |
4269 | flags |= FIEMAP_EXTENT_SHARED; | |
1506fcc8 YS |
4270 | } |
4271 | if (test_bit(EXTENT_FLAG_COMPRESSED, &em->flags)) | |
4272 | flags |= FIEMAP_EXTENT_ENCODED; | |
4273 | ||
1506fcc8 YS |
4274 | free_extent_map(em); |
4275 | em = NULL; | |
ec29ed5b CM |
4276 | if ((em_start >= last) || em_len == (u64)-1 || |
4277 | (last == (u64)-1 && isize <= em_end)) { | |
1506fcc8 YS |
4278 | flags |= FIEMAP_EXTENT_LAST; |
4279 | end = 1; | |
4280 | } | |
4281 | ||
ec29ed5b CM |
4282 | /* now scan forward to see if this is really the last extent. */ |
4283 | em = get_extent_skip_holes(inode, off, last_for_get_extent, | |
4284 | get_extent); | |
4285 | if (IS_ERR(em)) { | |
4286 | ret = PTR_ERR(em); | |
4287 | goto out; | |
4288 | } | |
4289 | if (!em) { | |
975f84fe JB |
4290 | flags |= FIEMAP_EXTENT_LAST; |
4291 | end = 1; | |
4292 | } | |
ec29ed5b CM |
4293 | ret = fiemap_fill_next_extent(fieinfo, em_start, disko, |
4294 | em_len, flags); | |
4295 | if (ret) | |
4296 | goto out_free; | |
1506fcc8 YS |
4297 | } |
4298 | out_free: | |
4299 | free_extent_map(em); | |
4300 | out: | |
fe09e16c | 4301 | btrfs_free_path(path); |
a52f4cd2 | 4302 | unlock_extent_cached(&BTRFS_I(inode)->io_tree, start, start + len - 1, |
2ac55d41 | 4303 | &cached_state, GFP_NOFS); |
1506fcc8 YS |
4304 | return ret; |
4305 | } | |
4306 | ||
727011e0 CM |
4307 | static void __free_extent_buffer(struct extent_buffer *eb) |
4308 | { | |
6d49ba1b | 4309 | btrfs_leak_debug_del(&eb->leak_list); |
727011e0 CM |
4310 | kmem_cache_free(extent_buffer_cache, eb); |
4311 | } | |
4312 | ||
a26e8c9f | 4313 | int extent_buffer_under_io(struct extent_buffer *eb) |
db7f3436 JB |
4314 | { |
4315 | return (atomic_read(&eb->io_pages) || | |
4316 | test_bit(EXTENT_BUFFER_WRITEBACK, &eb->bflags) || | |
4317 | test_bit(EXTENT_BUFFER_DIRTY, &eb->bflags)); | |
4318 | } | |
4319 | ||
4320 | /* | |
4321 | * Helper for releasing extent buffer page. | |
4322 | */ | |
4323 | static void btrfs_release_extent_buffer_page(struct extent_buffer *eb, | |
4324 | unsigned long start_idx) | |
4325 | { | |
4326 | unsigned long index; | |
4327 | unsigned long num_pages; | |
4328 | struct page *page; | |
4329 | int mapped = !test_bit(EXTENT_BUFFER_DUMMY, &eb->bflags); | |
4330 | ||
4331 | BUG_ON(extent_buffer_under_io(eb)); | |
4332 | ||
4333 | num_pages = num_extent_pages(eb->start, eb->len); | |
4334 | index = start_idx + num_pages; | |
4335 | if (start_idx >= index) | |
4336 | return; | |
4337 | ||
4338 | do { | |
4339 | index--; | |
4340 | page = extent_buffer_page(eb, index); | |
4341 | if (page && mapped) { | |
4342 | spin_lock(&page->mapping->private_lock); | |
4343 | /* | |
4344 | * We do this since we'll remove the pages after we've | |
4345 | * removed the eb from the radix tree, so we could race | |
4346 | * and have this page now attached to the new eb. So | |
4347 | * only clear page_private if it's still connected to | |
4348 | * this eb. | |
4349 | */ | |
4350 | if (PagePrivate(page) && | |
4351 | page->private == (unsigned long)eb) { | |
4352 | BUG_ON(test_bit(EXTENT_BUFFER_DIRTY, &eb->bflags)); | |
4353 | BUG_ON(PageDirty(page)); | |
4354 | BUG_ON(PageWriteback(page)); | |
4355 | /* | |
4356 | * We need to make sure we haven't be attached | |
4357 | * to a new eb. | |
4358 | */ | |
4359 | ClearPagePrivate(page); | |
4360 | set_page_private(page, 0); | |
4361 | /* One for the page private */ | |
4362 | page_cache_release(page); | |
4363 | } | |
4364 | spin_unlock(&page->mapping->private_lock); | |
4365 | ||
4366 | } | |
4367 | if (page) { | |
4368 | /* One for when we alloced the page */ | |
4369 | page_cache_release(page); | |
4370 | } | |
4371 | } while (index != start_idx); | |
4372 | } | |
4373 | ||
4374 | /* | |
4375 | * Helper for releasing the extent buffer. | |
4376 | */ | |
4377 | static inline void btrfs_release_extent_buffer(struct extent_buffer *eb) | |
4378 | { | |
4379 | btrfs_release_extent_buffer_page(eb, 0); | |
4380 | __free_extent_buffer(eb); | |
4381 | } | |
4382 | ||
f28491e0 JB |
4383 | static struct extent_buffer * |
4384 | __alloc_extent_buffer(struct btrfs_fs_info *fs_info, u64 start, | |
4385 | unsigned long len, gfp_t mask) | |
d1310b2e CM |
4386 | { |
4387 | struct extent_buffer *eb = NULL; | |
4388 | ||
d1310b2e | 4389 | eb = kmem_cache_zalloc(extent_buffer_cache, mask); |
91ca338d TI |
4390 | if (eb == NULL) |
4391 | return NULL; | |
d1310b2e CM |
4392 | eb->start = start; |
4393 | eb->len = len; | |
f28491e0 | 4394 | eb->fs_info = fs_info; |
815a51c7 | 4395 | eb->bflags = 0; |
bd681513 CM |
4396 | rwlock_init(&eb->lock); |
4397 | atomic_set(&eb->write_locks, 0); | |
4398 | atomic_set(&eb->read_locks, 0); | |
4399 | atomic_set(&eb->blocking_readers, 0); | |
4400 | atomic_set(&eb->blocking_writers, 0); | |
4401 | atomic_set(&eb->spinning_readers, 0); | |
4402 | atomic_set(&eb->spinning_writers, 0); | |
5b25f70f | 4403 | eb->lock_nested = 0; |
bd681513 CM |
4404 | init_waitqueue_head(&eb->write_lock_wq); |
4405 | init_waitqueue_head(&eb->read_lock_wq); | |
b4ce94de | 4406 | |
6d49ba1b ES |
4407 | btrfs_leak_debug_add(&eb->leak_list, &buffers); |
4408 | ||
3083ee2e | 4409 | spin_lock_init(&eb->refs_lock); |
d1310b2e | 4410 | atomic_set(&eb->refs, 1); |
0b32f4bb | 4411 | atomic_set(&eb->io_pages, 0); |
727011e0 | 4412 | |
b8dae313 DS |
4413 | /* |
4414 | * Sanity checks, currently the maximum is 64k covered by 16x 4k pages | |
4415 | */ | |
4416 | BUILD_BUG_ON(BTRFS_MAX_METADATA_BLOCKSIZE | |
4417 | > MAX_INLINE_EXTENT_BUFFER_SIZE); | |
4418 | BUG_ON(len > MAX_INLINE_EXTENT_BUFFER_SIZE); | |
d1310b2e CM |
4419 | |
4420 | return eb; | |
4421 | } | |
4422 | ||
815a51c7 JS |
4423 | struct extent_buffer *btrfs_clone_extent_buffer(struct extent_buffer *src) |
4424 | { | |
4425 | unsigned long i; | |
4426 | struct page *p; | |
4427 | struct extent_buffer *new; | |
4428 | unsigned long num_pages = num_extent_pages(src->start, src->len); | |
4429 | ||
9ec72677 | 4430 | new = __alloc_extent_buffer(NULL, src->start, src->len, GFP_NOFS); |
815a51c7 JS |
4431 | if (new == NULL) |
4432 | return NULL; | |
4433 | ||
4434 | for (i = 0; i < num_pages; i++) { | |
9ec72677 | 4435 | p = alloc_page(GFP_NOFS); |
db7f3436 JB |
4436 | if (!p) { |
4437 | btrfs_release_extent_buffer(new); | |
4438 | return NULL; | |
4439 | } | |
815a51c7 JS |
4440 | attach_extent_buffer_page(new, p); |
4441 | WARN_ON(PageDirty(p)); | |
4442 | SetPageUptodate(p); | |
4443 | new->pages[i] = p; | |
4444 | } | |
4445 | ||
4446 | copy_extent_buffer(new, src, 0, 0, src->len); | |
4447 | set_bit(EXTENT_BUFFER_UPTODATE, &new->bflags); | |
4448 | set_bit(EXTENT_BUFFER_DUMMY, &new->bflags); | |
4449 | ||
4450 | return new; | |
4451 | } | |
4452 | ||
4453 | struct extent_buffer *alloc_dummy_extent_buffer(u64 start, unsigned long len) | |
4454 | { | |
4455 | struct extent_buffer *eb; | |
4456 | unsigned long num_pages = num_extent_pages(0, len); | |
4457 | unsigned long i; | |
4458 | ||
9ec72677 | 4459 | eb = __alloc_extent_buffer(NULL, start, len, GFP_NOFS); |
815a51c7 JS |
4460 | if (!eb) |
4461 | return NULL; | |
4462 | ||
4463 | for (i = 0; i < num_pages; i++) { | |
9ec72677 | 4464 | eb->pages[i] = alloc_page(GFP_NOFS); |
815a51c7 JS |
4465 | if (!eb->pages[i]) |
4466 | goto err; | |
4467 | } | |
4468 | set_extent_buffer_uptodate(eb); | |
4469 | btrfs_set_header_nritems(eb, 0); | |
4470 | set_bit(EXTENT_BUFFER_DUMMY, &eb->bflags); | |
4471 | ||
4472 | return eb; | |
4473 | err: | |
84167d19 SB |
4474 | for (; i > 0; i--) |
4475 | __free_page(eb->pages[i - 1]); | |
815a51c7 JS |
4476 | __free_extent_buffer(eb); |
4477 | return NULL; | |
4478 | } | |
4479 | ||
0b32f4bb JB |
4480 | static void check_buffer_tree_ref(struct extent_buffer *eb) |
4481 | { | |
242e18c7 | 4482 | int refs; |
0b32f4bb JB |
4483 | /* the ref bit is tricky. We have to make sure it is set |
4484 | * if we have the buffer dirty. Otherwise the | |
4485 | * code to free a buffer can end up dropping a dirty | |
4486 | * page | |
4487 | * | |
4488 | * Once the ref bit is set, it won't go away while the | |
4489 | * buffer is dirty or in writeback, and it also won't | |
4490 | * go away while we have the reference count on the | |
4491 | * eb bumped. | |
4492 | * | |
4493 | * We can't just set the ref bit without bumping the | |
4494 | * ref on the eb because free_extent_buffer might | |
4495 | * see the ref bit and try to clear it. If this happens | |
4496 | * free_extent_buffer might end up dropping our original | |
4497 | * ref by mistake and freeing the page before we are able | |
4498 | * to add one more ref. | |
4499 | * | |
4500 | * So bump the ref count first, then set the bit. If someone | |
4501 | * beat us to it, drop the ref we added. | |
4502 | */ | |
242e18c7 CM |
4503 | refs = atomic_read(&eb->refs); |
4504 | if (refs >= 2 && test_bit(EXTENT_BUFFER_TREE_REF, &eb->bflags)) | |
4505 | return; | |
4506 | ||
594831c4 JB |
4507 | spin_lock(&eb->refs_lock); |
4508 | if (!test_and_set_bit(EXTENT_BUFFER_TREE_REF, &eb->bflags)) | |
0b32f4bb | 4509 | atomic_inc(&eb->refs); |
594831c4 | 4510 | spin_unlock(&eb->refs_lock); |
0b32f4bb JB |
4511 | } |
4512 | ||
5df4235e JB |
4513 | static void mark_extent_buffer_accessed(struct extent_buffer *eb) |
4514 | { | |
4515 | unsigned long num_pages, i; | |
4516 | ||
0b32f4bb JB |
4517 | check_buffer_tree_ref(eb); |
4518 | ||
5df4235e JB |
4519 | num_pages = num_extent_pages(eb->start, eb->len); |
4520 | for (i = 0; i < num_pages; i++) { | |
4521 | struct page *p = extent_buffer_page(eb, i); | |
4522 | mark_page_accessed(p); | |
4523 | } | |
4524 | } | |
4525 | ||
f28491e0 JB |
4526 | struct extent_buffer *find_extent_buffer(struct btrfs_fs_info *fs_info, |
4527 | u64 start) | |
452c75c3 CS |
4528 | { |
4529 | struct extent_buffer *eb; | |
4530 | ||
4531 | rcu_read_lock(); | |
f28491e0 JB |
4532 | eb = radix_tree_lookup(&fs_info->buffer_radix, |
4533 | start >> PAGE_CACHE_SHIFT); | |
452c75c3 CS |
4534 | if (eb && atomic_inc_not_zero(&eb->refs)) { |
4535 | rcu_read_unlock(); | |
4536 | mark_extent_buffer_accessed(eb); | |
4537 | return eb; | |
4538 | } | |
4539 | rcu_read_unlock(); | |
4540 | ||
4541 | return NULL; | |
4542 | } | |
4543 | ||
f28491e0 | 4544 | struct extent_buffer *alloc_extent_buffer(struct btrfs_fs_info *fs_info, |
727011e0 | 4545 | u64 start, unsigned long len) |
d1310b2e CM |
4546 | { |
4547 | unsigned long num_pages = num_extent_pages(start, len); | |
4548 | unsigned long i; | |
4549 | unsigned long index = start >> PAGE_CACHE_SHIFT; | |
4550 | struct extent_buffer *eb; | |
6af118ce | 4551 | struct extent_buffer *exists = NULL; |
d1310b2e | 4552 | struct page *p; |
f28491e0 | 4553 | struct address_space *mapping = fs_info->btree_inode->i_mapping; |
d1310b2e | 4554 | int uptodate = 1; |
19fe0a8b | 4555 | int ret; |
d1310b2e | 4556 | |
f28491e0 | 4557 | eb = find_extent_buffer(fs_info, start); |
452c75c3 | 4558 | if (eb) |
6af118ce | 4559 | return eb; |
6af118ce | 4560 | |
f28491e0 | 4561 | eb = __alloc_extent_buffer(fs_info, start, len, GFP_NOFS); |
2b114d1d | 4562 | if (!eb) |
d1310b2e CM |
4563 | return NULL; |
4564 | ||
727011e0 | 4565 | for (i = 0; i < num_pages; i++, index++) { |
a6591715 | 4566 | p = find_or_create_page(mapping, index, GFP_NOFS); |
4804b382 | 4567 | if (!p) |
6af118ce | 4568 | goto free_eb; |
4f2de97a JB |
4569 | |
4570 | spin_lock(&mapping->private_lock); | |
4571 | if (PagePrivate(p)) { | |
4572 | /* | |
4573 | * We could have already allocated an eb for this page | |
4574 | * and attached one so lets see if we can get a ref on | |
4575 | * the existing eb, and if we can we know it's good and | |
4576 | * we can just return that one, else we know we can just | |
4577 | * overwrite page->private. | |
4578 | */ | |
4579 | exists = (struct extent_buffer *)p->private; | |
4580 | if (atomic_inc_not_zero(&exists->refs)) { | |
4581 | spin_unlock(&mapping->private_lock); | |
4582 | unlock_page(p); | |
17de39ac | 4583 | page_cache_release(p); |
5df4235e | 4584 | mark_extent_buffer_accessed(exists); |
4f2de97a JB |
4585 | goto free_eb; |
4586 | } | |
4587 | ||
0b32f4bb | 4588 | /* |
4f2de97a JB |
4589 | * Do this so attach doesn't complain and we need to |
4590 | * drop the ref the old guy had. | |
4591 | */ | |
4592 | ClearPagePrivate(p); | |
0b32f4bb | 4593 | WARN_ON(PageDirty(p)); |
4f2de97a | 4594 | page_cache_release(p); |
d1310b2e | 4595 | } |
4f2de97a JB |
4596 | attach_extent_buffer_page(eb, p); |
4597 | spin_unlock(&mapping->private_lock); | |
0b32f4bb | 4598 | WARN_ON(PageDirty(p)); |
d1310b2e | 4599 | mark_page_accessed(p); |
727011e0 | 4600 | eb->pages[i] = p; |
d1310b2e CM |
4601 | if (!PageUptodate(p)) |
4602 | uptodate = 0; | |
eb14ab8e CM |
4603 | |
4604 | /* | |
4605 | * see below about how we avoid a nasty race with release page | |
4606 | * and why we unlock later | |
4607 | */ | |
d1310b2e CM |
4608 | } |
4609 | if (uptodate) | |
b4ce94de | 4610 | set_bit(EXTENT_BUFFER_UPTODATE, &eb->bflags); |
115391d2 | 4611 | again: |
19fe0a8b MX |
4612 | ret = radix_tree_preload(GFP_NOFS & ~__GFP_HIGHMEM); |
4613 | if (ret) | |
4614 | goto free_eb; | |
4615 | ||
f28491e0 JB |
4616 | spin_lock(&fs_info->buffer_lock); |
4617 | ret = radix_tree_insert(&fs_info->buffer_radix, | |
4618 | start >> PAGE_CACHE_SHIFT, eb); | |
4619 | spin_unlock(&fs_info->buffer_lock); | |
452c75c3 | 4620 | radix_tree_preload_end(); |
19fe0a8b | 4621 | if (ret == -EEXIST) { |
f28491e0 | 4622 | exists = find_extent_buffer(fs_info, start); |
452c75c3 CS |
4623 | if (exists) |
4624 | goto free_eb; | |
4625 | else | |
115391d2 | 4626 | goto again; |
6af118ce | 4627 | } |
6af118ce | 4628 | /* add one reference for the tree */ |
0b32f4bb | 4629 | check_buffer_tree_ref(eb); |
34b41ace | 4630 | set_bit(EXTENT_BUFFER_IN_TREE, &eb->bflags); |
eb14ab8e CM |
4631 | |
4632 | /* | |
4633 | * there is a race where release page may have | |
4634 | * tried to find this extent buffer in the radix | |
4635 | * but failed. It will tell the VM it is safe to | |
4636 | * reclaim the, and it will clear the page private bit. | |
4637 | * We must make sure to set the page private bit properly | |
4638 | * after the extent buffer is in the radix tree so | |
4639 | * it doesn't get lost | |
4640 | */ | |
727011e0 CM |
4641 | SetPageChecked(eb->pages[0]); |
4642 | for (i = 1; i < num_pages; i++) { | |
4643 | p = extent_buffer_page(eb, i); | |
727011e0 CM |
4644 | ClearPageChecked(p); |
4645 | unlock_page(p); | |
4646 | } | |
4647 | unlock_page(eb->pages[0]); | |
d1310b2e CM |
4648 | return eb; |
4649 | ||
6af118ce | 4650 | free_eb: |
727011e0 CM |
4651 | for (i = 0; i < num_pages; i++) { |
4652 | if (eb->pages[i]) | |
4653 | unlock_page(eb->pages[i]); | |
4654 | } | |
eb14ab8e | 4655 | |
17de39ac | 4656 | WARN_ON(!atomic_dec_and_test(&eb->refs)); |
897ca6e9 | 4657 | btrfs_release_extent_buffer(eb); |
6af118ce | 4658 | return exists; |
d1310b2e | 4659 | } |
d1310b2e | 4660 | |
3083ee2e JB |
4661 | static inline void btrfs_release_extent_buffer_rcu(struct rcu_head *head) |
4662 | { | |
4663 | struct extent_buffer *eb = | |
4664 | container_of(head, struct extent_buffer, rcu_head); | |
4665 | ||
4666 | __free_extent_buffer(eb); | |
4667 | } | |
4668 | ||
3083ee2e | 4669 | /* Expects to have eb->eb_lock already held */ |
f7a52a40 | 4670 | static int release_extent_buffer(struct extent_buffer *eb) |
3083ee2e JB |
4671 | { |
4672 | WARN_ON(atomic_read(&eb->refs) == 0); | |
4673 | if (atomic_dec_and_test(&eb->refs)) { | |
34b41ace | 4674 | if (test_and_clear_bit(EXTENT_BUFFER_IN_TREE, &eb->bflags)) { |
f28491e0 | 4675 | struct btrfs_fs_info *fs_info = eb->fs_info; |
3083ee2e | 4676 | |
815a51c7 | 4677 | spin_unlock(&eb->refs_lock); |
3083ee2e | 4678 | |
f28491e0 JB |
4679 | spin_lock(&fs_info->buffer_lock); |
4680 | radix_tree_delete(&fs_info->buffer_radix, | |
815a51c7 | 4681 | eb->start >> PAGE_CACHE_SHIFT); |
f28491e0 | 4682 | spin_unlock(&fs_info->buffer_lock); |
34b41ace JB |
4683 | } else { |
4684 | spin_unlock(&eb->refs_lock); | |
815a51c7 | 4685 | } |
3083ee2e JB |
4686 | |
4687 | /* Should be safe to release our pages at this point */ | |
4688 | btrfs_release_extent_buffer_page(eb, 0); | |
3083ee2e | 4689 | call_rcu(&eb->rcu_head, btrfs_release_extent_buffer_rcu); |
e64860aa | 4690 | return 1; |
3083ee2e JB |
4691 | } |
4692 | spin_unlock(&eb->refs_lock); | |
e64860aa JB |
4693 | |
4694 | return 0; | |
3083ee2e JB |
4695 | } |
4696 | ||
d1310b2e CM |
4697 | void free_extent_buffer(struct extent_buffer *eb) |
4698 | { | |
242e18c7 CM |
4699 | int refs; |
4700 | int old; | |
d1310b2e CM |
4701 | if (!eb) |
4702 | return; | |
4703 | ||
242e18c7 CM |
4704 | while (1) { |
4705 | refs = atomic_read(&eb->refs); | |
4706 | if (refs <= 3) | |
4707 | break; | |
4708 | old = atomic_cmpxchg(&eb->refs, refs, refs - 1); | |
4709 | if (old == refs) | |
4710 | return; | |
4711 | } | |
4712 | ||
3083ee2e | 4713 | spin_lock(&eb->refs_lock); |
815a51c7 JS |
4714 | if (atomic_read(&eb->refs) == 2 && |
4715 | test_bit(EXTENT_BUFFER_DUMMY, &eb->bflags)) | |
4716 | atomic_dec(&eb->refs); | |
4717 | ||
3083ee2e JB |
4718 | if (atomic_read(&eb->refs) == 2 && |
4719 | test_bit(EXTENT_BUFFER_STALE, &eb->bflags) && | |
0b32f4bb | 4720 | !extent_buffer_under_io(eb) && |
3083ee2e JB |
4721 | test_and_clear_bit(EXTENT_BUFFER_TREE_REF, &eb->bflags)) |
4722 | atomic_dec(&eb->refs); | |
4723 | ||
4724 | /* | |
4725 | * I know this is terrible, but it's temporary until we stop tracking | |
4726 | * the uptodate bits and such for the extent buffers. | |
4727 | */ | |
f7a52a40 | 4728 | release_extent_buffer(eb); |
3083ee2e JB |
4729 | } |
4730 | ||
4731 | void free_extent_buffer_stale(struct extent_buffer *eb) | |
4732 | { | |
4733 | if (!eb) | |
d1310b2e CM |
4734 | return; |
4735 | ||
3083ee2e JB |
4736 | spin_lock(&eb->refs_lock); |
4737 | set_bit(EXTENT_BUFFER_STALE, &eb->bflags); | |
4738 | ||
0b32f4bb | 4739 | if (atomic_read(&eb->refs) == 2 && !extent_buffer_under_io(eb) && |
3083ee2e JB |
4740 | test_and_clear_bit(EXTENT_BUFFER_TREE_REF, &eb->bflags)) |
4741 | atomic_dec(&eb->refs); | |
f7a52a40 | 4742 | release_extent_buffer(eb); |
d1310b2e | 4743 | } |
d1310b2e | 4744 | |
1d4284bd | 4745 | void clear_extent_buffer_dirty(struct extent_buffer *eb) |
d1310b2e | 4746 | { |
d1310b2e CM |
4747 | unsigned long i; |
4748 | unsigned long num_pages; | |
4749 | struct page *page; | |
4750 | ||
d1310b2e CM |
4751 | num_pages = num_extent_pages(eb->start, eb->len); |
4752 | ||
4753 | for (i = 0; i < num_pages; i++) { | |
4754 | page = extent_buffer_page(eb, i); | |
b9473439 | 4755 | if (!PageDirty(page)) |
d2c3f4f6 CM |
4756 | continue; |
4757 | ||
a61e6f29 | 4758 | lock_page(page); |
eb14ab8e CM |
4759 | WARN_ON(!PagePrivate(page)); |
4760 | ||
d1310b2e | 4761 | clear_page_dirty_for_io(page); |
0ee0fda0 | 4762 | spin_lock_irq(&page->mapping->tree_lock); |
d1310b2e CM |
4763 | if (!PageDirty(page)) { |
4764 | radix_tree_tag_clear(&page->mapping->page_tree, | |
4765 | page_index(page), | |
4766 | PAGECACHE_TAG_DIRTY); | |
4767 | } | |
0ee0fda0 | 4768 | spin_unlock_irq(&page->mapping->tree_lock); |
bf0da8c1 | 4769 | ClearPageError(page); |
a61e6f29 | 4770 | unlock_page(page); |
d1310b2e | 4771 | } |
0b32f4bb | 4772 | WARN_ON(atomic_read(&eb->refs) == 0); |
d1310b2e | 4773 | } |
d1310b2e | 4774 | |
0b32f4bb | 4775 | int set_extent_buffer_dirty(struct extent_buffer *eb) |
d1310b2e CM |
4776 | { |
4777 | unsigned long i; | |
4778 | unsigned long num_pages; | |
b9473439 | 4779 | int was_dirty = 0; |
d1310b2e | 4780 | |
0b32f4bb JB |
4781 | check_buffer_tree_ref(eb); |
4782 | ||
b9473439 | 4783 | was_dirty = test_and_set_bit(EXTENT_BUFFER_DIRTY, &eb->bflags); |
0b32f4bb | 4784 | |
d1310b2e | 4785 | num_pages = num_extent_pages(eb->start, eb->len); |
3083ee2e | 4786 | WARN_ON(atomic_read(&eb->refs) == 0); |
0b32f4bb JB |
4787 | WARN_ON(!test_bit(EXTENT_BUFFER_TREE_REF, &eb->bflags)); |
4788 | ||
b9473439 | 4789 | for (i = 0; i < num_pages; i++) |
0b32f4bb | 4790 | set_page_dirty(extent_buffer_page(eb, i)); |
b9473439 | 4791 | return was_dirty; |
d1310b2e | 4792 | } |
d1310b2e | 4793 | |
0b32f4bb | 4794 | int clear_extent_buffer_uptodate(struct extent_buffer *eb) |
1259ab75 CM |
4795 | { |
4796 | unsigned long i; | |
4797 | struct page *page; | |
4798 | unsigned long num_pages; | |
4799 | ||
b4ce94de | 4800 | clear_bit(EXTENT_BUFFER_UPTODATE, &eb->bflags); |
0b32f4bb | 4801 | num_pages = num_extent_pages(eb->start, eb->len); |
1259ab75 CM |
4802 | for (i = 0; i < num_pages; i++) { |
4803 | page = extent_buffer_page(eb, i); | |
33958dc6 CM |
4804 | if (page) |
4805 | ClearPageUptodate(page); | |
1259ab75 CM |
4806 | } |
4807 | return 0; | |
4808 | } | |
4809 | ||
0b32f4bb | 4810 | int set_extent_buffer_uptodate(struct extent_buffer *eb) |
d1310b2e CM |
4811 | { |
4812 | unsigned long i; | |
4813 | struct page *page; | |
4814 | unsigned long num_pages; | |
4815 | ||
0b32f4bb | 4816 | set_bit(EXTENT_BUFFER_UPTODATE, &eb->bflags); |
d1310b2e | 4817 | num_pages = num_extent_pages(eb->start, eb->len); |
d1310b2e CM |
4818 | for (i = 0; i < num_pages; i++) { |
4819 | page = extent_buffer_page(eb, i); | |
d1310b2e CM |
4820 | SetPageUptodate(page); |
4821 | } | |
4822 | return 0; | |
4823 | } | |
d1310b2e | 4824 | |
0b32f4bb | 4825 | int extent_buffer_uptodate(struct extent_buffer *eb) |
d1310b2e | 4826 | { |
0b32f4bb | 4827 | return test_bit(EXTENT_BUFFER_UPTODATE, &eb->bflags); |
d1310b2e | 4828 | } |
d1310b2e CM |
4829 | |
4830 | int read_extent_buffer_pages(struct extent_io_tree *tree, | |
bb82ab88 | 4831 | struct extent_buffer *eb, u64 start, int wait, |
f188591e | 4832 | get_extent_t *get_extent, int mirror_num) |
d1310b2e CM |
4833 | { |
4834 | unsigned long i; | |
4835 | unsigned long start_i; | |
4836 | struct page *page; | |
4837 | int err; | |
4838 | int ret = 0; | |
ce9adaa5 CM |
4839 | int locked_pages = 0; |
4840 | int all_uptodate = 1; | |
d1310b2e | 4841 | unsigned long num_pages; |
727011e0 | 4842 | unsigned long num_reads = 0; |
a86c12c7 | 4843 | struct bio *bio = NULL; |
c8b97818 | 4844 | unsigned long bio_flags = 0; |
a86c12c7 | 4845 | |
b4ce94de | 4846 | if (test_bit(EXTENT_BUFFER_UPTODATE, &eb->bflags)) |
d1310b2e CM |
4847 | return 0; |
4848 | ||
d1310b2e CM |
4849 | if (start) { |
4850 | WARN_ON(start < eb->start); | |
4851 | start_i = (start >> PAGE_CACHE_SHIFT) - | |
4852 | (eb->start >> PAGE_CACHE_SHIFT); | |
4853 | } else { | |
4854 | start_i = 0; | |
4855 | } | |
4856 | ||
4857 | num_pages = num_extent_pages(eb->start, eb->len); | |
4858 | for (i = start_i; i < num_pages; i++) { | |
4859 | page = extent_buffer_page(eb, i); | |
bb82ab88 | 4860 | if (wait == WAIT_NONE) { |
2db04966 | 4861 | if (!trylock_page(page)) |
ce9adaa5 | 4862 | goto unlock_exit; |
d1310b2e CM |
4863 | } else { |
4864 | lock_page(page); | |
4865 | } | |
ce9adaa5 | 4866 | locked_pages++; |
727011e0 CM |
4867 | if (!PageUptodate(page)) { |
4868 | num_reads++; | |
ce9adaa5 | 4869 | all_uptodate = 0; |
727011e0 | 4870 | } |
ce9adaa5 CM |
4871 | } |
4872 | if (all_uptodate) { | |
4873 | if (start_i == 0) | |
b4ce94de | 4874 | set_bit(EXTENT_BUFFER_UPTODATE, &eb->bflags); |
ce9adaa5 CM |
4875 | goto unlock_exit; |
4876 | } | |
4877 | ||
ea466794 | 4878 | clear_bit(EXTENT_BUFFER_IOERR, &eb->bflags); |
5cf1ab56 | 4879 | eb->read_mirror = 0; |
0b32f4bb | 4880 | atomic_set(&eb->io_pages, num_reads); |
ce9adaa5 CM |
4881 | for (i = start_i; i < num_pages; i++) { |
4882 | page = extent_buffer_page(eb, i); | |
ce9adaa5 | 4883 | if (!PageUptodate(page)) { |
f188591e | 4884 | ClearPageError(page); |
a86c12c7 | 4885 | err = __extent_read_full_page(tree, page, |
f188591e | 4886 | get_extent, &bio, |
d4c7ca86 JB |
4887 | mirror_num, &bio_flags, |
4888 | READ | REQ_META); | |
d397712b | 4889 | if (err) |
d1310b2e | 4890 | ret = err; |
d1310b2e CM |
4891 | } else { |
4892 | unlock_page(page); | |
4893 | } | |
4894 | } | |
4895 | ||
355808c2 | 4896 | if (bio) { |
d4c7ca86 JB |
4897 | err = submit_one_bio(READ | REQ_META, bio, mirror_num, |
4898 | bio_flags); | |
79787eaa JM |
4899 | if (err) |
4900 | return err; | |
355808c2 | 4901 | } |
a86c12c7 | 4902 | |
bb82ab88 | 4903 | if (ret || wait != WAIT_COMPLETE) |
d1310b2e | 4904 | return ret; |
d397712b | 4905 | |
d1310b2e CM |
4906 | for (i = start_i; i < num_pages; i++) { |
4907 | page = extent_buffer_page(eb, i); | |
4908 | wait_on_page_locked(page); | |
d397712b | 4909 | if (!PageUptodate(page)) |
d1310b2e | 4910 | ret = -EIO; |
d1310b2e | 4911 | } |
d397712b | 4912 | |
d1310b2e | 4913 | return ret; |
ce9adaa5 CM |
4914 | |
4915 | unlock_exit: | |
4916 | i = start_i; | |
d397712b | 4917 | while (locked_pages > 0) { |
ce9adaa5 CM |
4918 | page = extent_buffer_page(eb, i); |
4919 | i++; | |
4920 | unlock_page(page); | |
4921 | locked_pages--; | |
4922 | } | |
4923 | return ret; | |
d1310b2e | 4924 | } |
d1310b2e CM |
4925 | |
4926 | void read_extent_buffer(struct extent_buffer *eb, void *dstv, | |
4927 | unsigned long start, | |
4928 | unsigned long len) | |
4929 | { | |
4930 | size_t cur; | |
4931 | size_t offset; | |
4932 | struct page *page; | |
4933 | char *kaddr; | |
4934 | char *dst = (char *)dstv; | |
4935 | size_t start_offset = eb->start & ((u64)PAGE_CACHE_SIZE - 1); | |
4936 | unsigned long i = (start_offset + start) >> PAGE_CACHE_SHIFT; | |
d1310b2e CM |
4937 | |
4938 | WARN_ON(start > eb->len); | |
4939 | WARN_ON(start + len > eb->start + eb->len); | |
4940 | ||
778746b5 | 4941 | offset = (start_offset + start) & (PAGE_CACHE_SIZE - 1); |
d1310b2e | 4942 | |
d397712b | 4943 | while (len > 0) { |
d1310b2e | 4944 | page = extent_buffer_page(eb, i); |
d1310b2e CM |
4945 | |
4946 | cur = min(len, (PAGE_CACHE_SIZE - offset)); | |
a6591715 | 4947 | kaddr = page_address(page); |
d1310b2e | 4948 | memcpy(dst, kaddr + offset, cur); |
d1310b2e CM |
4949 | |
4950 | dst += cur; | |
4951 | len -= cur; | |
4952 | offset = 0; | |
4953 | i++; | |
4954 | } | |
4955 | } | |
d1310b2e CM |
4956 | |
4957 | int map_private_extent_buffer(struct extent_buffer *eb, unsigned long start, | |
a6591715 | 4958 | unsigned long min_len, char **map, |
d1310b2e | 4959 | unsigned long *map_start, |
a6591715 | 4960 | unsigned long *map_len) |
d1310b2e CM |
4961 | { |
4962 | size_t offset = start & (PAGE_CACHE_SIZE - 1); | |
4963 | char *kaddr; | |
4964 | struct page *p; | |
4965 | size_t start_offset = eb->start & ((u64)PAGE_CACHE_SIZE - 1); | |
4966 | unsigned long i = (start_offset + start) >> PAGE_CACHE_SHIFT; | |
4967 | unsigned long end_i = (start_offset + start + min_len - 1) >> | |
4968 | PAGE_CACHE_SHIFT; | |
4969 | ||
4970 | if (i != end_i) | |
4971 | return -EINVAL; | |
4972 | ||
4973 | if (i == 0) { | |
4974 | offset = start_offset; | |
4975 | *map_start = 0; | |
4976 | } else { | |
4977 | offset = 0; | |
4978 | *map_start = ((u64)i << PAGE_CACHE_SHIFT) - start_offset; | |
4979 | } | |
d397712b | 4980 | |
d1310b2e | 4981 | if (start + min_len > eb->len) { |
31b1a2bd | 4982 | WARN(1, KERN_ERR "btrfs bad mapping eb start %llu len %lu, " |
c1c9ff7c GU |
4983 | "wanted %lu %lu\n", |
4984 | eb->start, eb->len, start, min_len); | |
85026533 | 4985 | return -EINVAL; |
d1310b2e CM |
4986 | } |
4987 | ||
4988 | p = extent_buffer_page(eb, i); | |
a6591715 | 4989 | kaddr = page_address(p); |
d1310b2e CM |
4990 | *map = kaddr + offset; |
4991 | *map_len = PAGE_CACHE_SIZE - offset; | |
4992 | return 0; | |
4993 | } | |
d1310b2e | 4994 | |
d1310b2e CM |
4995 | int memcmp_extent_buffer(struct extent_buffer *eb, const void *ptrv, |
4996 | unsigned long start, | |
4997 | unsigned long len) | |
4998 | { | |
4999 | size_t cur; | |
5000 | size_t offset; | |
5001 | struct page *page; | |
5002 | char *kaddr; | |
5003 | char *ptr = (char *)ptrv; | |
5004 | size_t start_offset = eb->start & ((u64)PAGE_CACHE_SIZE - 1); | |
5005 | unsigned long i = (start_offset + start) >> PAGE_CACHE_SHIFT; | |
5006 | int ret = 0; | |
5007 | ||
5008 | WARN_ON(start > eb->len); | |
5009 | WARN_ON(start + len > eb->start + eb->len); | |
5010 | ||
778746b5 | 5011 | offset = (start_offset + start) & (PAGE_CACHE_SIZE - 1); |
d1310b2e | 5012 | |
d397712b | 5013 | while (len > 0) { |
d1310b2e | 5014 | page = extent_buffer_page(eb, i); |
d1310b2e CM |
5015 | |
5016 | cur = min(len, (PAGE_CACHE_SIZE - offset)); | |
5017 | ||
a6591715 | 5018 | kaddr = page_address(page); |
d1310b2e | 5019 | ret = memcmp(ptr, kaddr + offset, cur); |
d1310b2e CM |
5020 | if (ret) |
5021 | break; | |
5022 | ||
5023 | ptr += cur; | |
5024 | len -= cur; | |
5025 | offset = 0; | |
5026 | i++; | |
5027 | } | |
5028 | return ret; | |
5029 | } | |
d1310b2e CM |
5030 | |
5031 | void write_extent_buffer(struct extent_buffer *eb, const void *srcv, | |
5032 | unsigned long start, unsigned long len) | |
5033 | { | |
5034 | size_t cur; | |
5035 | size_t offset; | |
5036 | struct page *page; | |
5037 | char *kaddr; | |
5038 | char *src = (char *)srcv; | |
5039 | size_t start_offset = eb->start & ((u64)PAGE_CACHE_SIZE - 1); | |
5040 | unsigned long i = (start_offset + start) >> PAGE_CACHE_SHIFT; | |
5041 | ||
5042 | WARN_ON(start > eb->len); | |
5043 | WARN_ON(start + len > eb->start + eb->len); | |
5044 | ||
778746b5 | 5045 | offset = (start_offset + start) & (PAGE_CACHE_SIZE - 1); |
d1310b2e | 5046 | |
d397712b | 5047 | while (len > 0) { |
d1310b2e CM |
5048 | page = extent_buffer_page(eb, i); |
5049 | WARN_ON(!PageUptodate(page)); | |
5050 | ||
5051 | cur = min(len, PAGE_CACHE_SIZE - offset); | |
a6591715 | 5052 | kaddr = page_address(page); |
d1310b2e | 5053 | memcpy(kaddr + offset, src, cur); |
d1310b2e CM |
5054 | |
5055 | src += cur; | |
5056 | len -= cur; | |
5057 | offset = 0; | |
5058 | i++; | |
5059 | } | |
5060 | } | |
d1310b2e CM |
5061 | |
5062 | void memset_extent_buffer(struct extent_buffer *eb, char c, | |
5063 | unsigned long start, unsigned long len) | |
5064 | { | |
5065 | size_t cur; | |
5066 | size_t offset; | |
5067 | struct page *page; | |
5068 | char *kaddr; | |
5069 | size_t start_offset = eb->start & ((u64)PAGE_CACHE_SIZE - 1); | |
5070 | unsigned long i = (start_offset + start) >> PAGE_CACHE_SHIFT; | |
5071 | ||
5072 | WARN_ON(start > eb->len); | |
5073 | WARN_ON(start + len > eb->start + eb->len); | |
5074 | ||
778746b5 | 5075 | offset = (start_offset + start) & (PAGE_CACHE_SIZE - 1); |
d1310b2e | 5076 | |
d397712b | 5077 | while (len > 0) { |
d1310b2e CM |
5078 | page = extent_buffer_page(eb, i); |
5079 | WARN_ON(!PageUptodate(page)); | |
5080 | ||
5081 | cur = min(len, PAGE_CACHE_SIZE - offset); | |
a6591715 | 5082 | kaddr = page_address(page); |
d1310b2e | 5083 | memset(kaddr + offset, c, cur); |
d1310b2e CM |
5084 | |
5085 | len -= cur; | |
5086 | offset = 0; | |
5087 | i++; | |
5088 | } | |
5089 | } | |
d1310b2e CM |
5090 | |
5091 | void copy_extent_buffer(struct extent_buffer *dst, struct extent_buffer *src, | |
5092 | unsigned long dst_offset, unsigned long src_offset, | |
5093 | unsigned long len) | |
5094 | { | |
5095 | u64 dst_len = dst->len; | |
5096 | size_t cur; | |
5097 | size_t offset; | |
5098 | struct page *page; | |
5099 | char *kaddr; | |
5100 | size_t start_offset = dst->start & ((u64)PAGE_CACHE_SIZE - 1); | |
5101 | unsigned long i = (start_offset + dst_offset) >> PAGE_CACHE_SHIFT; | |
5102 | ||
5103 | WARN_ON(src->len != dst_len); | |
5104 | ||
5105 | offset = (start_offset + dst_offset) & | |
778746b5 | 5106 | (PAGE_CACHE_SIZE - 1); |
d1310b2e | 5107 | |
d397712b | 5108 | while (len > 0) { |
d1310b2e CM |
5109 | page = extent_buffer_page(dst, i); |
5110 | WARN_ON(!PageUptodate(page)); | |
5111 | ||
5112 | cur = min(len, (unsigned long)(PAGE_CACHE_SIZE - offset)); | |
5113 | ||
a6591715 | 5114 | kaddr = page_address(page); |
d1310b2e | 5115 | read_extent_buffer(src, kaddr + offset, src_offset, cur); |
d1310b2e CM |
5116 | |
5117 | src_offset += cur; | |
5118 | len -= cur; | |
5119 | offset = 0; | |
5120 | i++; | |
5121 | } | |
5122 | } | |
d1310b2e | 5123 | |
3387206f ST |
5124 | static inline bool areas_overlap(unsigned long src, unsigned long dst, unsigned long len) |
5125 | { | |
5126 | unsigned long distance = (src > dst) ? src - dst : dst - src; | |
5127 | return distance < len; | |
5128 | } | |
5129 | ||
d1310b2e CM |
5130 | static void copy_pages(struct page *dst_page, struct page *src_page, |
5131 | unsigned long dst_off, unsigned long src_off, | |
5132 | unsigned long len) | |
5133 | { | |
a6591715 | 5134 | char *dst_kaddr = page_address(dst_page); |
d1310b2e | 5135 | char *src_kaddr; |
727011e0 | 5136 | int must_memmove = 0; |
d1310b2e | 5137 | |
3387206f | 5138 | if (dst_page != src_page) { |
a6591715 | 5139 | src_kaddr = page_address(src_page); |
3387206f | 5140 | } else { |
d1310b2e | 5141 | src_kaddr = dst_kaddr; |
727011e0 CM |
5142 | if (areas_overlap(src_off, dst_off, len)) |
5143 | must_memmove = 1; | |
3387206f | 5144 | } |
d1310b2e | 5145 | |
727011e0 CM |
5146 | if (must_memmove) |
5147 | memmove(dst_kaddr + dst_off, src_kaddr + src_off, len); | |
5148 | else | |
5149 | memcpy(dst_kaddr + dst_off, src_kaddr + src_off, len); | |
d1310b2e CM |
5150 | } |
5151 | ||
5152 | void memcpy_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset, | |
5153 | unsigned long src_offset, unsigned long len) | |
5154 | { | |
5155 | size_t cur; | |
5156 | size_t dst_off_in_page; | |
5157 | size_t src_off_in_page; | |
5158 | size_t start_offset = dst->start & ((u64)PAGE_CACHE_SIZE - 1); | |
5159 | unsigned long dst_i; | |
5160 | unsigned long src_i; | |
5161 | ||
5162 | if (src_offset + len > dst->len) { | |
efe120a0 | 5163 | printk(KERN_ERR "BTRFS: memmove bogus src_offset %lu move " |
d397712b | 5164 | "len %lu dst len %lu\n", src_offset, len, dst->len); |
d1310b2e CM |
5165 | BUG_ON(1); |
5166 | } | |
5167 | if (dst_offset + len > dst->len) { | |
efe120a0 | 5168 | printk(KERN_ERR "BTRFS: memmove bogus dst_offset %lu move " |
d397712b | 5169 | "len %lu dst len %lu\n", dst_offset, len, dst->len); |
d1310b2e CM |
5170 | BUG_ON(1); |
5171 | } | |
5172 | ||
d397712b | 5173 | while (len > 0) { |
d1310b2e | 5174 | dst_off_in_page = (start_offset + dst_offset) & |
778746b5 | 5175 | (PAGE_CACHE_SIZE - 1); |
d1310b2e | 5176 | src_off_in_page = (start_offset + src_offset) & |
778746b5 | 5177 | (PAGE_CACHE_SIZE - 1); |
d1310b2e CM |
5178 | |
5179 | dst_i = (start_offset + dst_offset) >> PAGE_CACHE_SHIFT; | |
5180 | src_i = (start_offset + src_offset) >> PAGE_CACHE_SHIFT; | |
5181 | ||
5182 | cur = min(len, (unsigned long)(PAGE_CACHE_SIZE - | |
5183 | src_off_in_page)); | |
5184 | cur = min_t(unsigned long, cur, | |
5185 | (unsigned long)(PAGE_CACHE_SIZE - dst_off_in_page)); | |
5186 | ||
5187 | copy_pages(extent_buffer_page(dst, dst_i), | |
5188 | extent_buffer_page(dst, src_i), | |
5189 | dst_off_in_page, src_off_in_page, cur); | |
5190 | ||
5191 | src_offset += cur; | |
5192 | dst_offset += cur; | |
5193 | len -= cur; | |
5194 | } | |
5195 | } | |
d1310b2e CM |
5196 | |
5197 | void memmove_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset, | |
5198 | unsigned long src_offset, unsigned long len) | |
5199 | { | |
5200 | size_t cur; | |
5201 | size_t dst_off_in_page; | |
5202 | size_t src_off_in_page; | |
5203 | unsigned long dst_end = dst_offset + len - 1; | |
5204 | unsigned long src_end = src_offset + len - 1; | |
5205 | size_t start_offset = dst->start & ((u64)PAGE_CACHE_SIZE - 1); | |
5206 | unsigned long dst_i; | |
5207 | unsigned long src_i; | |
5208 | ||
5209 | if (src_offset + len > dst->len) { | |
efe120a0 | 5210 | printk(KERN_ERR "BTRFS: memmove bogus src_offset %lu move " |
d397712b | 5211 | "len %lu len %lu\n", src_offset, len, dst->len); |
d1310b2e CM |
5212 | BUG_ON(1); |
5213 | } | |
5214 | if (dst_offset + len > dst->len) { | |
efe120a0 | 5215 | printk(KERN_ERR "BTRFS: memmove bogus dst_offset %lu move " |
d397712b | 5216 | "len %lu len %lu\n", dst_offset, len, dst->len); |
d1310b2e CM |
5217 | BUG_ON(1); |
5218 | } | |
727011e0 | 5219 | if (dst_offset < src_offset) { |
d1310b2e CM |
5220 | memcpy_extent_buffer(dst, dst_offset, src_offset, len); |
5221 | return; | |
5222 | } | |
d397712b | 5223 | while (len > 0) { |
d1310b2e CM |
5224 | dst_i = (start_offset + dst_end) >> PAGE_CACHE_SHIFT; |
5225 | src_i = (start_offset + src_end) >> PAGE_CACHE_SHIFT; | |
5226 | ||
5227 | dst_off_in_page = (start_offset + dst_end) & | |
778746b5 | 5228 | (PAGE_CACHE_SIZE - 1); |
d1310b2e | 5229 | src_off_in_page = (start_offset + src_end) & |
778746b5 | 5230 | (PAGE_CACHE_SIZE - 1); |
d1310b2e CM |
5231 | |
5232 | cur = min_t(unsigned long, len, src_off_in_page + 1); | |
5233 | cur = min(cur, dst_off_in_page + 1); | |
1877e1a7 | 5234 | copy_pages(extent_buffer_page(dst, dst_i), |
d1310b2e CM |
5235 | extent_buffer_page(dst, src_i), |
5236 | dst_off_in_page - cur + 1, | |
5237 | src_off_in_page - cur + 1, cur); | |
5238 | ||
5239 | dst_end -= cur; | |
5240 | src_end -= cur; | |
5241 | len -= cur; | |
5242 | } | |
5243 | } | |
6af118ce | 5244 | |
f7a52a40 | 5245 | int try_release_extent_buffer(struct page *page) |
19fe0a8b | 5246 | { |
6af118ce | 5247 | struct extent_buffer *eb; |
6af118ce | 5248 | |
3083ee2e JB |
5249 | /* |
5250 | * We need to make sure noboody is attaching this page to an eb right | |
5251 | * now. | |
5252 | */ | |
5253 | spin_lock(&page->mapping->private_lock); | |
5254 | if (!PagePrivate(page)) { | |
5255 | spin_unlock(&page->mapping->private_lock); | |
4f2de97a | 5256 | return 1; |
45f49bce | 5257 | } |
6af118ce | 5258 | |
3083ee2e JB |
5259 | eb = (struct extent_buffer *)page->private; |
5260 | BUG_ON(!eb); | |
19fe0a8b MX |
5261 | |
5262 | /* | |
3083ee2e JB |
5263 | * This is a little awful but should be ok, we need to make sure that |
5264 | * the eb doesn't disappear out from under us while we're looking at | |
5265 | * this page. | |
19fe0a8b | 5266 | */ |
3083ee2e | 5267 | spin_lock(&eb->refs_lock); |
0b32f4bb | 5268 | if (atomic_read(&eb->refs) != 1 || extent_buffer_under_io(eb)) { |
3083ee2e JB |
5269 | spin_unlock(&eb->refs_lock); |
5270 | spin_unlock(&page->mapping->private_lock); | |
5271 | return 0; | |
b9473439 | 5272 | } |
3083ee2e | 5273 | spin_unlock(&page->mapping->private_lock); |
897ca6e9 | 5274 | |
19fe0a8b | 5275 | /* |
3083ee2e JB |
5276 | * If tree ref isn't set then we know the ref on this eb is a real ref, |
5277 | * so just return, this page will likely be freed soon anyway. | |
19fe0a8b | 5278 | */ |
3083ee2e JB |
5279 | if (!test_and_clear_bit(EXTENT_BUFFER_TREE_REF, &eb->bflags)) { |
5280 | spin_unlock(&eb->refs_lock); | |
5281 | return 0; | |
b9473439 | 5282 | } |
19fe0a8b | 5283 | |
f7a52a40 | 5284 | return release_extent_buffer(eb); |
6af118ce | 5285 | } |