Commit | Line | Data |
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d1310b2e CM |
1 | #include <linux/bitops.h> |
2 | #include <linux/slab.h> | |
3 | #include <linux/bio.h> | |
4 | #include <linux/mm.h> | |
d1310b2e CM |
5 | #include <linux/pagemap.h> |
6 | #include <linux/page-flags.h> | |
d1310b2e CM |
7 | #include <linux/spinlock.h> |
8 | #include <linux/blkdev.h> | |
9 | #include <linux/swap.h> | |
d1310b2e CM |
10 | #include <linux/writeback.h> |
11 | #include <linux/pagevec.h> | |
268bb0ce | 12 | #include <linux/prefetch.h> |
90a887c9 | 13 | #include <linux/cleancache.h> |
d1310b2e CM |
14 | #include "extent_io.h" |
15 | #include "extent_map.h" | |
902b22f3 DW |
16 | #include "ctree.h" |
17 | #include "btrfs_inode.h" | |
4a54c8c1 | 18 | #include "volumes.h" |
21adbd5c | 19 | #include "check-integrity.h" |
0b32f4bb | 20 | #include "locking.h" |
606686ee | 21 | #include "rcu-string.h" |
fe09e16c | 22 | #include "backref.h" |
d1310b2e | 23 | |
d1310b2e CM |
24 | static struct kmem_cache *extent_state_cache; |
25 | static struct kmem_cache *extent_buffer_cache; | |
9be3395b | 26 | static struct bio_set *btrfs_bioset; |
d1310b2e | 27 | |
27a3507d FM |
28 | static inline bool extent_state_in_tree(const struct extent_state *state) |
29 | { | |
30 | return !RB_EMPTY_NODE(&state->rb_node); | |
31 | } | |
32 | ||
6d49ba1b | 33 | #ifdef CONFIG_BTRFS_DEBUG |
d1310b2e CM |
34 | static LIST_HEAD(buffers); |
35 | static LIST_HEAD(states); | |
4bef0848 | 36 | |
d397712b | 37 | static DEFINE_SPINLOCK(leak_lock); |
6d49ba1b ES |
38 | |
39 | static inline | |
40 | void btrfs_leak_debug_add(struct list_head *new, struct list_head *head) | |
41 | { | |
42 | unsigned long flags; | |
43 | ||
44 | spin_lock_irqsave(&leak_lock, flags); | |
45 | list_add(new, head); | |
46 | spin_unlock_irqrestore(&leak_lock, flags); | |
47 | } | |
48 | ||
49 | static inline | |
50 | void btrfs_leak_debug_del(struct list_head *entry) | |
51 | { | |
52 | unsigned long flags; | |
53 | ||
54 | spin_lock_irqsave(&leak_lock, flags); | |
55 | list_del(entry); | |
56 | spin_unlock_irqrestore(&leak_lock, flags); | |
57 | } | |
58 | ||
59 | static inline | |
60 | void btrfs_leak_debug_check(void) | |
61 | { | |
62 | struct extent_state *state; | |
63 | struct extent_buffer *eb; | |
64 | ||
65 | while (!list_empty(&states)) { | |
66 | state = list_entry(states.next, struct extent_state, leak_list); | |
27a3507d FM |
67 | pr_err("BTRFS: state leak: start %llu end %llu state %lu in tree %d refs %d\n", |
68 | state->start, state->end, state->state, | |
69 | extent_state_in_tree(state), | |
c1c9ff7c | 70 | atomic_read(&state->refs)); |
6d49ba1b ES |
71 | list_del(&state->leak_list); |
72 | kmem_cache_free(extent_state_cache, state); | |
73 | } | |
74 | ||
75 | while (!list_empty(&buffers)) { | |
76 | eb = list_entry(buffers.next, struct extent_buffer, leak_list); | |
efe120a0 | 77 | printk(KERN_ERR "BTRFS: buffer leak start %llu len %lu " |
c1c9ff7c GU |
78 | "refs %d\n", |
79 | eb->start, eb->len, atomic_read(&eb->refs)); | |
6d49ba1b ES |
80 | list_del(&eb->leak_list); |
81 | kmem_cache_free(extent_buffer_cache, eb); | |
82 | } | |
83 | } | |
8d599ae1 | 84 | |
a5dee37d JB |
85 | #define btrfs_debug_check_extent_io_range(tree, start, end) \ |
86 | __btrfs_debug_check_extent_io_range(__func__, (tree), (start), (end)) | |
8d599ae1 | 87 | static inline void __btrfs_debug_check_extent_io_range(const char *caller, |
a5dee37d | 88 | struct extent_io_tree *tree, u64 start, u64 end) |
8d599ae1 | 89 | { |
a5dee37d JB |
90 | struct inode *inode; |
91 | u64 isize; | |
8d599ae1 | 92 | |
a5dee37d JB |
93 | if (!tree->mapping) |
94 | return; | |
8d599ae1 | 95 | |
a5dee37d JB |
96 | inode = tree->mapping->host; |
97 | isize = i_size_read(inode); | |
8d599ae1 DS |
98 | if (end >= PAGE_SIZE && (end % 2) == 0 && end != isize - 1) { |
99 | printk_ratelimited(KERN_DEBUG | |
efe120a0 | 100 | "BTRFS: %s: ino %llu isize %llu odd range [%llu,%llu]\n", |
c1c9ff7c | 101 | caller, btrfs_ino(inode), isize, start, end); |
8d599ae1 DS |
102 | } |
103 | } | |
6d49ba1b ES |
104 | #else |
105 | #define btrfs_leak_debug_add(new, head) do {} while (0) | |
106 | #define btrfs_leak_debug_del(entry) do {} while (0) | |
107 | #define btrfs_leak_debug_check() do {} while (0) | |
8d599ae1 | 108 | #define btrfs_debug_check_extent_io_range(c, s, e) do {} while (0) |
4bef0848 | 109 | #endif |
d1310b2e | 110 | |
d1310b2e CM |
111 | #define BUFFER_LRU_MAX 64 |
112 | ||
113 | struct tree_entry { | |
114 | u64 start; | |
115 | u64 end; | |
d1310b2e CM |
116 | struct rb_node rb_node; |
117 | }; | |
118 | ||
119 | struct extent_page_data { | |
120 | struct bio *bio; | |
121 | struct extent_io_tree *tree; | |
122 | get_extent_t *get_extent; | |
de0022b9 | 123 | unsigned long bio_flags; |
771ed689 CM |
124 | |
125 | /* tells writepage not to lock the state bits for this range | |
126 | * it still does the unlocking | |
127 | */ | |
ffbd517d CM |
128 | unsigned int extent_locked:1; |
129 | ||
130 | /* tells the submit_bio code to use a WRITE_SYNC */ | |
131 | unsigned int sync_io:1; | |
d1310b2e CM |
132 | }; |
133 | ||
0b32f4bb | 134 | static noinline void flush_write_bio(void *data); |
c2d904e0 JM |
135 | static inline struct btrfs_fs_info * |
136 | tree_fs_info(struct extent_io_tree *tree) | |
137 | { | |
a5dee37d JB |
138 | if (!tree->mapping) |
139 | return NULL; | |
c2d904e0 JM |
140 | return btrfs_sb(tree->mapping->host->i_sb); |
141 | } | |
0b32f4bb | 142 | |
d1310b2e CM |
143 | int __init extent_io_init(void) |
144 | { | |
837e1972 | 145 | extent_state_cache = kmem_cache_create("btrfs_extent_state", |
9601e3f6 CH |
146 | sizeof(struct extent_state), 0, |
147 | SLAB_RECLAIM_ACCOUNT | SLAB_MEM_SPREAD, NULL); | |
d1310b2e CM |
148 | if (!extent_state_cache) |
149 | return -ENOMEM; | |
150 | ||
837e1972 | 151 | extent_buffer_cache = kmem_cache_create("btrfs_extent_buffer", |
9601e3f6 CH |
152 | sizeof(struct extent_buffer), 0, |
153 | SLAB_RECLAIM_ACCOUNT | SLAB_MEM_SPREAD, NULL); | |
d1310b2e CM |
154 | if (!extent_buffer_cache) |
155 | goto free_state_cache; | |
9be3395b CM |
156 | |
157 | btrfs_bioset = bioset_create(BIO_POOL_SIZE, | |
158 | offsetof(struct btrfs_io_bio, bio)); | |
159 | if (!btrfs_bioset) | |
160 | goto free_buffer_cache; | |
b208c2f7 DW |
161 | |
162 | if (bioset_integrity_create(btrfs_bioset, BIO_POOL_SIZE)) | |
163 | goto free_bioset; | |
164 | ||
d1310b2e CM |
165 | return 0; |
166 | ||
b208c2f7 DW |
167 | free_bioset: |
168 | bioset_free(btrfs_bioset); | |
169 | btrfs_bioset = NULL; | |
170 | ||
9be3395b CM |
171 | free_buffer_cache: |
172 | kmem_cache_destroy(extent_buffer_cache); | |
173 | extent_buffer_cache = NULL; | |
174 | ||
d1310b2e CM |
175 | free_state_cache: |
176 | kmem_cache_destroy(extent_state_cache); | |
9be3395b | 177 | extent_state_cache = NULL; |
d1310b2e CM |
178 | return -ENOMEM; |
179 | } | |
180 | ||
181 | void extent_io_exit(void) | |
182 | { | |
6d49ba1b | 183 | btrfs_leak_debug_check(); |
8c0a8537 KS |
184 | |
185 | /* | |
186 | * Make sure all delayed rcu free are flushed before we | |
187 | * destroy caches. | |
188 | */ | |
189 | rcu_barrier(); | |
d1310b2e CM |
190 | if (extent_state_cache) |
191 | kmem_cache_destroy(extent_state_cache); | |
192 | if (extent_buffer_cache) | |
193 | kmem_cache_destroy(extent_buffer_cache); | |
9be3395b CM |
194 | if (btrfs_bioset) |
195 | bioset_free(btrfs_bioset); | |
d1310b2e CM |
196 | } |
197 | ||
198 | void extent_io_tree_init(struct extent_io_tree *tree, | |
f993c883 | 199 | struct address_space *mapping) |
d1310b2e | 200 | { |
6bef4d31 | 201 | tree->state = RB_ROOT; |
d1310b2e CM |
202 | tree->ops = NULL; |
203 | tree->dirty_bytes = 0; | |
70dec807 | 204 | spin_lock_init(&tree->lock); |
d1310b2e | 205 | tree->mapping = mapping; |
d1310b2e | 206 | } |
d1310b2e | 207 | |
b2950863 | 208 | static struct extent_state *alloc_extent_state(gfp_t mask) |
d1310b2e CM |
209 | { |
210 | struct extent_state *state; | |
d1310b2e CM |
211 | |
212 | state = kmem_cache_alloc(extent_state_cache, mask); | |
2b114d1d | 213 | if (!state) |
d1310b2e CM |
214 | return state; |
215 | state->state = 0; | |
d1310b2e | 216 | state->private = 0; |
27a3507d | 217 | RB_CLEAR_NODE(&state->rb_node); |
6d49ba1b | 218 | btrfs_leak_debug_add(&state->leak_list, &states); |
d1310b2e CM |
219 | atomic_set(&state->refs, 1); |
220 | init_waitqueue_head(&state->wq); | |
143bede5 | 221 | trace_alloc_extent_state(state, mask, _RET_IP_); |
d1310b2e CM |
222 | return state; |
223 | } | |
d1310b2e | 224 | |
4845e44f | 225 | void free_extent_state(struct extent_state *state) |
d1310b2e | 226 | { |
d1310b2e CM |
227 | if (!state) |
228 | return; | |
229 | if (atomic_dec_and_test(&state->refs)) { | |
27a3507d | 230 | WARN_ON(extent_state_in_tree(state)); |
6d49ba1b | 231 | btrfs_leak_debug_del(&state->leak_list); |
143bede5 | 232 | trace_free_extent_state(state, _RET_IP_); |
d1310b2e CM |
233 | kmem_cache_free(extent_state_cache, state); |
234 | } | |
235 | } | |
d1310b2e | 236 | |
f2071b21 FM |
237 | static struct rb_node *tree_insert(struct rb_root *root, |
238 | struct rb_node *search_start, | |
239 | u64 offset, | |
12cfbad9 FDBM |
240 | struct rb_node *node, |
241 | struct rb_node ***p_in, | |
242 | struct rb_node **parent_in) | |
d1310b2e | 243 | { |
f2071b21 | 244 | struct rb_node **p; |
d397712b | 245 | struct rb_node *parent = NULL; |
d1310b2e CM |
246 | struct tree_entry *entry; |
247 | ||
12cfbad9 FDBM |
248 | if (p_in && parent_in) { |
249 | p = *p_in; | |
250 | parent = *parent_in; | |
251 | goto do_insert; | |
252 | } | |
253 | ||
f2071b21 | 254 | p = search_start ? &search_start : &root->rb_node; |
d397712b | 255 | while (*p) { |
d1310b2e CM |
256 | parent = *p; |
257 | entry = rb_entry(parent, struct tree_entry, rb_node); | |
258 | ||
259 | if (offset < entry->start) | |
260 | p = &(*p)->rb_left; | |
261 | else if (offset > entry->end) | |
262 | p = &(*p)->rb_right; | |
263 | else | |
264 | return parent; | |
265 | } | |
266 | ||
12cfbad9 | 267 | do_insert: |
d1310b2e CM |
268 | rb_link_node(node, parent, p); |
269 | rb_insert_color(node, root); | |
270 | return NULL; | |
271 | } | |
272 | ||
80ea96b1 | 273 | static struct rb_node *__etree_search(struct extent_io_tree *tree, u64 offset, |
12cfbad9 FDBM |
274 | struct rb_node **prev_ret, |
275 | struct rb_node **next_ret, | |
276 | struct rb_node ***p_ret, | |
277 | struct rb_node **parent_ret) | |
d1310b2e | 278 | { |
80ea96b1 | 279 | struct rb_root *root = &tree->state; |
12cfbad9 | 280 | struct rb_node **n = &root->rb_node; |
d1310b2e CM |
281 | struct rb_node *prev = NULL; |
282 | struct rb_node *orig_prev = NULL; | |
283 | struct tree_entry *entry; | |
284 | struct tree_entry *prev_entry = NULL; | |
285 | ||
12cfbad9 FDBM |
286 | while (*n) { |
287 | prev = *n; | |
288 | entry = rb_entry(prev, struct tree_entry, rb_node); | |
d1310b2e CM |
289 | prev_entry = entry; |
290 | ||
291 | if (offset < entry->start) | |
12cfbad9 | 292 | n = &(*n)->rb_left; |
d1310b2e | 293 | else if (offset > entry->end) |
12cfbad9 | 294 | n = &(*n)->rb_right; |
d397712b | 295 | else |
12cfbad9 | 296 | return *n; |
d1310b2e CM |
297 | } |
298 | ||
12cfbad9 FDBM |
299 | if (p_ret) |
300 | *p_ret = n; | |
301 | if (parent_ret) | |
302 | *parent_ret = prev; | |
303 | ||
d1310b2e CM |
304 | if (prev_ret) { |
305 | orig_prev = prev; | |
d397712b | 306 | while (prev && offset > prev_entry->end) { |
d1310b2e CM |
307 | prev = rb_next(prev); |
308 | prev_entry = rb_entry(prev, struct tree_entry, rb_node); | |
309 | } | |
310 | *prev_ret = prev; | |
311 | prev = orig_prev; | |
312 | } | |
313 | ||
314 | if (next_ret) { | |
315 | prev_entry = rb_entry(prev, struct tree_entry, rb_node); | |
d397712b | 316 | while (prev && offset < prev_entry->start) { |
d1310b2e CM |
317 | prev = rb_prev(prev); |
318 | prev_entry = rb_entry(prev, struct tree_entry, rb_node); | |
319 | } | |
320 | *next_ret = prev; | |
321 | } | |
322 | return NULL; | |
323 | } | |
324 | ||
12cfbad9 FDBM |
325 | static inline struct rb_node * |
326 | tree_search_for_insert(struct extent_io_tree *tree, | |
327 | u64 offset, | |
328 | struct rb_node ***p_ret, | |
329 | struct rb_node **parent_ret) | |
d1310b2e | 330 | { |
70dec807 | 331 | struct rb_node *prev = NULL; |
d1310b2e | 332 | struct rb_node *ret; |
70dec807 | 333 | |
12cfbad9 | 334 | ret = __etree_search(tree, offset, &prev, NULL, p_ret, parent_ret); |
d397712b | 335 | if (!ret) |
d1310b2e CM |
336 | return prev; |
337 | return ret; | |
338 | } | |
339 | ||
12cfbad9 FDBM |
340 | static inline struct rb_node *tree_search(struct extent_io_tree *tree, |
341 | u64 offset) | |
342 | { | |
343 | return tree_search_for_insert(tree, offset, NULL, NULL); | |
344 | } | |
345 | ||
9ed74f2d JB |
346 | static void merge_cb(struct extent_io_tree *tree, struct extent_state *new, |
347 | struct extent_state *other) | |
348 | { | |
349 | if (tree->ops && tree->ops->merge_extent_hook) | |
350 | tree->ops->merge_extent_hook(tree->mapping->host, new, | |
351 | other); | |
352 | } | |
353 | ||
d1310b2e CM |
354 | /* |
355 | * utility function to look for merge candidates inside a given range. | |
356 | * Any extents with matching state are merged together into a single | |
357 | * extent in the tree. Extents with EXTENT_IO in their state field | |
358 | * are not merged because the end_io handlers need to be able to do | |
359 | * operations on them without sleeping (or doing allocations/splits). | |
360 | * | |
361 | * This should be called with the tree lock held. | |
362 | */ | |
1bf85046 JM |
363 | static void merge_state(struct extent_io_tree *tree, |
364 | struct extent_state *state) | |
d1310b2e CM |
365 | { |
366 | struct extent_state *other; | |
367 | struct rb_node *other_node; | |
368 | ||
5b21f2ed | 369 | if (state->state & (EXTENT_IOBITS | EXTENT_BOUNDARY)) |
1bf85046 | 370 | return; |
d1310b2e CM |
371 | |
372 | other_node = rb_prev(&state->rb_node); | |
373 | if (other_node) { | |
374 | other = rb_entry(other_node, struct extent_state, rb_node); | |
375 | if (other->end == state->start - 1 && | |
376 | other->state == state->state) { | |
9ed74f2d | 377 | merge_cb(tree, state, other); |
d1310b2e | 378 | state->start = other->start; |
d1310b2e | 379 | rb_erase(&other->rb_node, &tree->state); |
27a3507d | 380 | RB_CLEAR_NODE(&other->rb_node); |
d1310b2e CM |
381 | free_extent_state(other); |
382 | } | |
383 | } | |
384 | other_node = rb_next(&state->rb_node); | |
385 | if (other_node) { | |
386 | other = rb_entry(other_node, struct extent_state, rb_node); | |
387 | if (other->start == state->end + 1 && | |
388 | other->state == state->state) { | |
9ed74f2d | 389 | merge_cb(tree, state, other); |
df98b6e2 | 390 | state->end = other->end; |
df98b6e2 | 391 | rb_erase(&other->rb_node, &tree->state); |
27a3507d | 392 | RB_CLEAR_NODE(&other->rb_node); |
df98b6e2 | 393 | free_extent_state(other); |
d1310b2e CM |
394 | } |
395 | } | |
d1310b2e CM |
396 | } |
397 | ||
1bf85046 | 398 | static void set_state_cb(struct extent_io_tree *tree, |
41074888 | 399 | struct extent_state *state, unsigned long *bits) |
291d673e | 400 | { |
1bf85046 JM |
401 | if (tree->ops && tree->ops->set_bit_hook) |
402 | tree->ops->set_bit_hook(tree->mapping->host, state, bits); | |
291d673e CM |
403 | } |
404 | ||
405 | static void clear_state_cb(struct extent_io_tree *tree, | |
41074888 | 406 | struct extent_state *state, unsigned long *bits) |
291d673e | 407 | { |
9ed74f2d JB |
408 | if (tree->ops && tree->ops->clear_bit_hook) |
409 | tree->ops->clear_bit_hook(tree->mapping->host, state, bits); | |
291d673e CM |
410 | } |
411 | ||
3150b699 | 412 | static void set_state_bits(struct extent_io_tree *tree, |
41074888 | 413 | struct extent_state *state, unsigned long *bits); |
3150b699 | 414 | |
d1310b2e CM |
415 | /* |
416 | * insert an extent_state struct into the tree. 'bits' are set on the | |
417 | * struct before it is inserted. | |
418 | * | |
419 | * This may return -EEXIST if the extent is already there, in which case the | |
420 | * state struct is freed. | |
421 | * | |
422 | * The tree lock is not taken internally. This is a utility function and | |
423 | * probably isn't what you want to call (see set/clear_extent_bit). | |
424 | */ | |
425 | static int insert_state(struct extent_io_tree *tree, | |
426 | struct extent_state *state, u64 start, u64 end, | |
12cfbad9 FDBM |
427 | struct rb_node ***p, |
428 | struct rb_node **parent, | |
41074888 | 429 | unsigned long *bits) |
d1310b2e CM |
430 | { |
431 | struct rb_node *node; | |
432 | ||
31b1a2bd | 433 | if (end < start) |
efe120a0 | 434 | WARN(1, KERN_ERR "BTRFS: end < start %llu %llu\n", |
c1c9ff7c | 435 | end, start); |
d1310b2e CM |
436 | state->start = start; |
437 | state->end = end; | |
9ed74f2d | 438 | |
3150b699 XG |
439 | set_state_bits(tree, state, bits); |
440 | ||
f2071b21 | 441 | node = tree_insert(&tree->state, NULL, end, &state->rb_node, p, parent); |
d1310b2e CM |
442 | if (node) { |
443 | struct extent_state *found; | |
444 | found = rb_entry(node, struct extent_state, rb_node); | |
efe120a0 | 445 | printk(KERN_ERR "BTRFS: found node %llu %llu on insert of " |
c1c9ff7c GU |
446 | "%llu %llu\n", |
447 | found->start, found->end, start, end); | |
d1310b2e CM |
448 | return -EEXIST; |
449 | } | |
450 | merge_state(tree, state); | |
451 | return 0; | |
452 | } | |
453 | ||
1bf85046 | 454 | static void split_cb(struct extent_io_tree *tree, struct extent_state *orig, |
9ed74f2d JB |
455 | u64 split) |
456 | { | |
457 | if (tree->ops && tree->ops->split_extent_hook) | |
1bf85046 | 458 | tree->ops->split_extent_hook(tree->mapping->host, orig, split); |
9ed74f2d JB |
459 | } |
460 | ||
d1310b2e CM |
461 | /* |
462 | * split a given extent state struct in two, inserting the preallocated | |
463 | * struct 'prealloc' as the newly created second half. 'split' indicates an | |
464 | * offset inside 'orig' where it should be split. | |
465 | * | |
466 | * Before calling, | |
467 | * the tree has 'orig' at [orig->start, orig->end]. After calling, there | |
468 | * are two extent state structs in the tree: | |
469 | * prealloc: [orig->start, split - 1] | |
470 | * orig: [ split, orig->end ] | |
471 | * | |
472 | * The tree locks are not taken by this function. They need to be held | |
473 | * by the caller. | |
474 | */ | |
475 | static int split_state(struct extent_io_tree *tree, struct extent_state *orig, | |
476 | struct extent_state *prealloc, u64 split) | |
477 | { | |
478 | struct rb_node *node; | |
9ed74f2d JB |
479 | |
480 | split_cb(tree, orig, split); | |
481 | ||
d1310b2e CM |
482 | prealloc->start = orig->start; |
483 | prealloc->end = split - 1; | |
484 | prealloc->state = orig->state; | |
485 | orig->start = split; | |
486 | ||
f2071b21 FM |
487 | node = tree_insert(&tree->state, &orig->rb_node, prealloc->end, |
488 | &prealloc->rb_node, NULL, NULL); | |
d1310b2e | 489 | if (node) { |
d1310b2e CM |
490 | free_extent_state(prealloc); |
491 | return -EEXIST; | |
492 | } | |
493 | return 0; | |
494 | } | |
495 | ||
cdc6a395 LZ |
496 | static struct extent_state *next_state(struct extent_state *state) |
497 | { | |
498 | struct rb_node *next = rb_next(&state->rb_node); | |
499 | if (next) | |
500 | return rb_entry(next, struct extent_state, rb_node); | |
501 | else | |
502 | return NULL; | |
503 | } | |
504 | ||
d1310b2e CM |
505 | /* |
506 | * utility function to clear some bits in an extent state struct. | |
1b303fc0 | 507 | * it will optionally wake up any one waiting on this state (wake == 1). |
d1310b2e CM |
508 | * |
509 | * If no bits are set on the state struct after clearing things, the | |
510 | * struct is freed and removed from the tree | |
511 | */ | |
cdc6a395 LZ |
512 | static struct extent_state *clear_state_bit(struct extent_io_tree *tree, |
513 | struct extent_state *state, | |
41074888 | 514 | unsigned long *bits, int wake) |
d1310b2e | 515 | { |
cdc6a395 | 516 | struct extent_state *next; |
41074888 | 517 | unsigned long bits_to_clear = *bits & ~EXTENT_CTLBITS; |
d1310b2e | 518 | |
0ca1f7ce | 519 | if ((bits_to_clear & EXTENT_DIRTY) && (state->state & EXTENT_DIRTY)) { |
d1310b2e CM |
520 | u64 range = state->end - state->start + 1; |
521 | WARN_ON(range > tree->dirty_bytes); | |
522 | tree->dirty_bytes -= range; | |
523 | } | |
291d673e | 524 | clear_state_cb(tree, state, bits); |
32c00aff | 525 | state->state &= ~bits_to_clear; |
d1310b2e CM |
526 | if (wake) |
527 | wake_up(&state->wq); | |
0ca1f7ce | 528 | if (state->state == 0) { |
cdc6a395 | 529 | next = next_state(state); |
27a3507d | 530 | if (extent_state_in_tree(state)) { |
d1310b2e | 531 | rb_erase(&state->rb_node, &tree->state); |
27a3507d | 532 | RB_CLEAR_NODE(&state->rb_node); |
d1310b2e CM |
533 | free_extent_state(state); |
534 | } else { | |
535 | WARN_ON(1); | |
536 | } | |
537 | } else { | |
538 | merge_state(tree, state); | |
cdc6a395 | 539 | next = next_state(state); |
d1310b2e | 540 | } |
cdc6a395 | 541 | return next; |
d1310b2e CM |
542 | } |
543 | ||
8233767a XG |
544 | static struct extent_state * |
545 | alloc_extent_state_atomic(struct extent_state *prealloc) | |
546 | { | |
547 | if (!prealloc) | |
548 | prealloc = alloc_extent_state(GFP_ATOMIC); | |
549 | ||
550 | return prealloc; | |
551 | } | |
552 | ||
48a3b636 | 553 | static void extent_io_tree_panic(struct extent_io_tree *tree, int err) |
c2d904e0 JM |
554 | { |
555 | btrfs_panic(tree_fs_info(tree), err, "Locking error: " | |
556 | "Extent tree was modified by another " | |
557 | "thread while locked."); | |
558 | } | |
559 | ||
d1310b2e CM |
560 | /* |
561 | * clear some bits on a range in the tree. This may require splitting | |
562 | * or inserting elements in the tree, so the gfp mask is used to | |
563 | * indicate which allocations or sleeping are allowed. | |
564 | * | |
565 | * pass 'wake' == 1 to kick any sleepers, and 'delete' == 1 to remove | |
566 | * the given range from the tree regardless of state (ie for truncate). | |
567 | * | |
568 | * the range [start, end] is inclusive. | |
569 | * | |
6763af84 | 570 | * This takes the tree lock, and returns 0 on success and < 0 on error. |
d1310b2e CM |
571 | */ |
572 | int clear_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, | |
41074888 | 573 | unsigned long bits, int wake, int delete, |
2c64c53d CM |
574 | struct extent_state **cached_state, |
575 | gfp_t mask) | |
d1310b2e CM |
576 | { |
577 | struct extent_state *state; | |
2c64c53d | 578 | struct extent_state *cached; |
d1310b2e CM |
579 | struct extent_state *prealloc = NULL; |
580 | struct rb_node *node; | |
5c939df5 | 581 | u64 last_end; |
d1310b2e | 582 | int err; |
2ac55d41 | 583 | int clear = 0; |
d1310b2e | 584 | |
a5dee37d | 585 | btrfs_debug_check_extent_io_range(tree, start, end); |
8d599ae1 | 586 | |
7ee9e440 JB |
587 | if (bits & EXTENT_DELALLOC) |
588 | bits |= EXTENT_NORESERVE; | |
589 | ||
0ca1f7ce YZ |
590 | if (delete) |
591 | bits |= ~EXTENT_CTLBITS; | |
592 | bits |= EXTENT_FIRST_DELALLOC; | |
593 | ||
2ac55d41 JB |
594 | if (bits & (EXTENT_IOBITS | EXTENT_BOUNDARY)) |
595 | clear = 1; | |
d1310b2e CM |
596 | again: |
597 | if (!prealloc && (mask & __GFP_WAIT)) { | |
598 | prealloc = alloc_extent_state(mask); | |
599 | if (!prealloc) | |
600 | return -ENOMEM; | |
601 | } | |
602 | ||
cad321ad | 603 | spin_lock(&tree->lock); |
2c64c53d CM |
604 | if (cached_state) { |
605 | cached = *cached_state; | |
2ac55d41 JB |
606 | |
607 | if (clear) { | |
608 | *cached_state = NULL; | |
609 | cached_state = NULL; | |
610 | } | |
611 | ||
27a3507d FM |
612 | if (cached && extent_state_in_tree(cached) && |
613 | cached->start <= start && cached->end > start) { | |
2ac55d41 JB |
614 | if (clear) |
615 | atomic_dec(&cached->refs); | |
2c64c53d | 616 | state = cached; |
42daec29 | 617 | goto hit_next; |
2c64c53d | 618 | } |
2ac55d41 JB |
619 | if (clear) |
620 | free_extent_state(cached); | |
2c64c53d | 621 | } |
d1310b2e CM |
622 | /* |
623 | * this search will find the extents that end after | |
624 | * our range starts | |
625 | */ | |
80ea96b1 | 626 | node = tree_search(tree, start); |
d1310b2e CM |
627 | if (!node) |
628 | goto out; | |
629 | state = rb_entry(node, struct extent_state, rb_node); | |
2c64c53d | 630 | hit_next: |
d1310b2e CM |
631 | if (state->start > end) |
632 | goto out; | |
633 | WARN_ON(state->end < start); | |
5c939df5 | 634 | last_end = state->end; |
d1310b2e | 635 | |
0449314a | 636 | /* the state doesn't have the wanted bits, go ahead */ |
cdc6a395 LZ |
637 | if (!(state->state & bits)) { |
638 | state = next_state(state); | |
0449314a | 639 | goto next; |
cdc6a395 | 640 | } |
0449314a | 641 | |
d1310b2e CM |
642 | /* |
643 | * | ---- desired range ---- | | |
644 | * | state | or | |
645 | * | ------------- state -------------- | | |
646 | * | |
647 | * We need to split the extent we found, and may flip | |
648 | * bits on second half. | |
649 | * | |
650 | * If the extent we found extends past our range, we | |
651 | * just split and search again. It'll get split again | |
652 | * the next time though. | |
653 | * | |
654 | * If the extent we found is inside our range, we clear | |
655 | * the desired bit on it. | |
656 | */ | |
657 | ||
658 | if (state->start < start) { | |
8233767a XG |
659 | prealloc = alloc_extent_state_atomic(prealloc); |
660 | BUG_ON(!prealloc); | |
d1310b2e | 661 | err = split_state(tree, state, prealloc, start); |
c2d904e0 JM |
662 | if (err) |
663 | extent_io_tree_panic(tree, err); | |
664 | ||
d1310b2e CM |
665 | prealloc = NULL; |
666 | if (err) | |
667 | goto out; | |
668 | if (state->end <= end) { | |
d1ac6e41 LB |
669 | state = clear_state_bit(tree, state, &bits, wake); |
670 | goto next; | |
d1310b2e CM |
671 | } |
672 | goto search_again; | |
673 | } | |
674 | /* | |
675 | * | ---- desired range ---- | | |
676 | * | state | | |
677 | * We need to split the extent, and clear the bit | |
678 | * on the first half | |
679 | */ | |
680 | if (state->start <= end && state->end > end) { | |
8233767a XG |
681 | prealloc = alloc_extent_state_atomic(prealloc); |
682 | BUG_ON(!prealloc); | |
d1310b2e | 683 | err = split_state(tree, state, prealloc, end + 1); |
c2d904e0 JM |
684 | if (err) |
685 | extent_io_tree_panic(tree, err); | |
686 | ||
d1310b2e CM |
687 | if (wake) |
688 | wake_up(&state->wq); | |
42daec29 | 689 | |
6763af84 | 690 | clear_state_bit(tree, prealloc, &bits, wake); |
9ed74f2d | 691 | |
d1310b2e CM |
692 | prealloc = NULL; |
693 | goto out; | |
694 | } | |
42daec29 | 695 | |
cdc6a395 | 696 | state = clear_state_bit(tree, state, &bits, wake); |
0449314a | 697 | next: |
5c939df5 YZ |
698 | if (last_end == (u64)-1) |
699 | goto out; | |
700 | start = last_end + 1; | |
cdc6a395 | 701 | if (start <= end && state && !need_resched()) |
692e5759 | 702 | goto hit_next; |
d1310b2e CM |
703 | goto search_again; |
704 | ||
705 | out: | |
cad321ad | 706 | spin_unlock(&tree->lock); |
d1310b2e CM |
707 | if (prealloc) |
708 | free_extent_state(prealloc); | |
709 | ||
6763af84 | 710 | return 0; |
d1310b2e CM |
711 | |
712 | search_again: | |
713 | if (start > end) | |
714 | goto out; | |
cad321ad | 715 | spin_unlock(&tree->lock); |
d1310b2e CM |
716 | if (mask & __GFP_WAIT) |
717 | cond_resched(); | |
718 | goto again; | |
719 | } | |
d1310b2e | 720 | |
143bede5 JM |
721 | static void wait_on_state(struct extent_io_tree *tree, |
722 | struct extent_state *state) | |
641f5219 CH |
723 | __releases(tree->lock) |
724 | __acquires(tree->lock) | |
d1310b2e CM |
725 | { |
726 | DEFINE_WAIT(wait); | |
727 | prepare_to_wait(&state->wq, &wait, TASK_UNINTERRUPTIBLE); | |
cad321ad | 728 | spin_unlock(&tree->lock); |
d1310b2e | 729 | schedule(); |
cad321ad | 730 | spin_lock(&tree->lock); |
d1310b2e | 731 | finish_wait(&state->wq, &wait); |
d1310b2e CM |
732 | } |
733 | ||
734 | /* | |
735 | * waits for one or more bits to clear on a range in the state tree. | |
736 | * The range [start, end] is inclusive. | |
737 | * The tree lock is taken by this function | |
738 | */ | |
41074888 DS |
739 | static void wait_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, |
740 | unsigned long bits) | |
d1310b2e CM |
741 | { |
742 | struct extent_state *state; | |
743 | struct rb_node *node; | |
744 | ||
a5dee37d | 745 | btrfs_debug_check_extent_io_range(tree, start, end); |
8d599ae1 | 746 | |
cad321ad | 747 | spin_lock(&tree->lock); |
d1310b2e CM |
748 | again: |
749 | while (1) { | |
750 | /* | |
751 | * this search will find all the extents that end after | |
752 | * our range starts | |
753 | */ | |
80ea96b1 | 754 | node = tree_search(tree, start); |
c50d3e71 | 755 | process_node: |
d1310b2e CM |
756 | if (!node) |
757 | break; | |
758 | ||
759 | state = rb_entry(node, struct extent_state, rb_node); | |
760 | ||
761 | if (state->start > end) | |
762 | goto out; | |
763 | ||
764 | if (state->state & bits) { | |
765 | start = state->start; | |
766 | atomic_inc(&state->refs); | |
767 | wait_on_state(tree, state); | |
768 | free_extent_state(state); | |
769 | goto again; | |
770 | } | |
771 | start = state->end + 1; | |
772 | ||
773 | if (start > end) | |
774 | break; | |
775 | ||
c50d3e71 FM |
776 | if (!cond_resched_lock(&tree->lock)) { |
777 | node = rb_next(node); | |
778 | goto process_node; | |
779 | } | |
d1310b2e CM |
780 | } |
781 | out: | |
cad321ad | 782 | spin_unlock(&tree->lock); |
d1310b2e | 783 | } |
d1310b2e | 784 | |
1bf85046 | 785 | static void set_state_bits(struct extent_io_tree *tree, |
d1310b2e | 786 | struct extent_state *state, |
41074888 | 787 | unsigned long *bits) |
d1310b2e | 788 | { |
41074888 | 789 | unsigned long bits_to_set = *bits & ~EXTENT_CTLBITS; |
9ed74f2d | 790 | |
1bf85046 | 791 | set_state_cb(tree, state, bits); |
0ca1f7ce | 792 | if ((bits_to_set & EXTENT_DIRTY) && !(state->state & EXTENT_DIRTY)) { |
d1310b2e CM |
793 | u64 range = state->end - state->start + 1; |
794 | tree->dirty_bytes += range; | |
795 | } | |
0ca1f7ce | 796 | state->state |= bits_to_set; |
d1310b2e CM |
797 | } |
798 | ||
2c64c53d CM |
799 | static void cache_state(struct extent_state *state, |
800 | struct extent_state **cached_ptr) | |
801 | { | |
802 | if (cached_ptr && !(*cached_ptr)) { | |
803 | if (state->state & (EXTENT_IOBITS | EXTENT_BOUNDARY)) { | |
804 | *cached_ptr = state; | |
805 | atomic_inc(&state->refs); | |
806 | } | |
807 | } | |
808 | } | |
809 | ||
d1310b2e | 810 | /* |
1edbb734 CM |
811 | * set some bits on a range in the tree. This may require allocations or |
812 | * sleeping, so the gfp mask is used to indicate what is allowed. | |
d1310b2e | 813 | * |
1edbb734 CM |
814 | * If any of the exclusive bits are set, this will fail with -EEXIST if some |
815 | * part of the range already has the desired bits set. The start of the | |
816 | * existing range is returned in failed_start in this case. | |
d1310b2e | 817 | * |
1edbb734 | 818 | * [start, end] is inclusive This takes the tree lock. |
d1310b2e | 819 | */ |
1edbb734 | 820 | |
3fbe5c02 JM |
821 | static int __must_check |
822 | __set_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, | |
41074888 DS |
823 | unsigned long bits, unsigned long exclusive_bits, |
824 | u64 *failed_start, struct extent_state **cached_state, | |
825 | gfp_t mask) | |
d1310b2e CM |
826 | { |
827 | struct extent_state *state; | |
828 | struct extent_state *prealloc = NULL; | |
829 | struct rb_node *node; | |
12cfbad9 FDBM |
830 | struct rb_node **p; |
831 | struct rb_node *parent; | |
d1310b2e | 832 | int err = 0; |
d1310b2e CM |
833 | u64 last_start; |
834 | u64 last_end; | |
42daec29 | 835 | |
a5dee37d | 836 | btrfs_debug_check_extent_io_range(tree, start, end); |
8d599ae1 | 837 | |
0ca1f7ce | 838 | bits |= EXTENT_FIRST_DELALLOC; |
d1310b2e CM |
839 | again: |
840 | if (!prealloc && (mask & __GFP_WAIT)) { | |
841 | prealloc = alloc_extent_state(mask); | |
8233767a | 842 | BUG_ON(!prealloc); |
d1310b2e CM |
843 | } |
844 | ||
cad321ad | 845 | spin_lock(&tree->lock); |
9655d298 CM |
846 | if (cached_state && *cached_state) { |
847 | state = *cached_state; | |
df98b6e2 | 848 | if (state->start <= start && state->end > start && |
27a3507d | 849 | extent_state_in_tree(state)) { |
9655d298 CM |
850 | node = &state->rb_node; |
851 | goto hit_next; | |
852 | } | |
853 | } | |
d1310b2e CM |
854 | /* |
855 | * this search will find all the extents that end after | |
856 | * our range starts. | |
857 | */ | |
12cfbad9 | 858 | node = tree_search_for_insert(tree, start, &p, &parent); |
d1310b2e | 859 | if (!node) { |
8233767a XG |
860 | prealloc = alloc_extent_state_atomic(prealloc); |
861 | BUG_ON(!prealloc); | |
12cfbad9 FDBM |
862 | err = insert_state(tree, prealloc, start, end, |
863 | &p, &parent, &bits); | |
c2d904e0 JM |
864 | if (err) |
865 | extent_io_tree_panic(tree, err); | |
866 | ||
c42ac0bc | 867 | cache_state(prealloc, cached_state); |
d1310b2e | 868 | prealloc = NULL; |
d1310b2e CM |
869 | goto out; |
870 | } | |
d1310b2e | 871 | state = rb_entry(node, struct extent_state, rb_node); |
40431d6c | 872 | hit_next: |
d1310b2e CM |
873 | last_start = state->start; |
874 | last_end = state->end; | |
875 | ||
876 | /* | |
877 | * | ---- desired range ---- | | |
878 | * | state | | |
879 | * | |
880 | * Just lock what we found and keep going | |
881 | */ | |
882 | if (state->start == start && state->end <= end) { | |
1edbb734 | 883 | if (state->state & exclusive_bits) { |
d1310b2e CM |
884 | *failed_start = state->start; |
885 | err = -EEXIST; | |
886 | goto out; | |
887 | } | |
42daec29 | 888 | |
1bf85046 | 889 | set_state_bits(tree, state, &bits); |
2c64c53d | 890 | cache_state(state, cached_state); |
d1310b2e | 891 | merge_state(tree, state); |
5c939df5 YZ |
892 | if (last_end == (u64)-1) |
893 | goto out; | |
894 | start = last_end + 1; | |
d1ac6e41 LB |
895 | state = next_state(state); |
896 | if (start < end && state && state->start == start && | |
897 | !need_resched()) | |
898 | goto hit_next; | |
d1310b2e CM |
899 | goto search_again; |
900 | } | |
901 | ||
902 | /* | |
903 | * | ---- desired range ---- | | |
904 | * | state | | |
905 | * or | |
906 | * | ------------- state -------------- | | |
907 | * | |
908 | * We need to split the extent we found, and may flip bits on | |
909 | * second half. | |
910 | * | |
911 | * If the extent we found extends past our | |
912 | * range, we just split and search again. It'll get split | |
913 | * again the next time though. | |
914 | * | |
915 | * If the extent we found is inside our range, we set the | |
916 | * desired bit on it. | |
917 | */ | |
918 | if (state->start < start) { | |
1edbb734 | 919 | if (state->state & exclusive_bits) { |
d1310b2e CM |
920 | *failed_start = start; |
921 | err = -EEXIST; | |
922 | goto out; | |
923 | } | |
8233767a XG |
924 | |
925 | prealloc = alloc_extent_state_atomic(prealloc); | |
926 | BUG_ON(!prealloc); | |
d1310b2e | 927 | err = split_state(tree, state, prealloc, start); |
c2d904e0 JM |
928 | if (err) |
929 | extent_io_tree_panic(tree, err); | |
930 | ||
d1310b2e CM |
931 | prealloc = NULL; |
932 | if (err) | |
933 | goto out; | |
934 | if (state->end <= end) { | |
1bf85046 | 935 | set_state_bits(tree, state, &bits); |
2c64c53d | 936 | cache_state(state, cached_state); |
d1310b2e | 937 | merge_state(tree, state); |
5c939df5 YZ |
938 | if (last_end == (u64)-1) |
939 | goto out; | |
940 | start = last_end + 1; | |
d1ac6e41 LB |
941 | state = next_state(state); |
942 | if (start < end && state && state->start == start && | |
943 | !need_resched()) | |
944 | goto hit_next; | |
d1310b2e CM |
945 | } |
946 | goto search_again; | |
947 | } | |
948 | /* | |
949 | * | ---- desired range ---- | | |
950 | * | state | or | state | | |
951 | * | |
952 | * There's a hole, we need to insert something in it and | |
953 | * ignore the extent we found. | |
954 | */ | |
955 | if (state->start > start) { | |
956 | u64 this_end; | |
957 | if (end < last_start) | |
958 | this_end = end; | |
959 | else | |
d397712b | 960 | this_end = last_start - 1; |
8233767a XG |
961 | |
962 | prealloc = alloc_extent_state_atomic(prealloc); | |
963 | BUG_ON(!prealloc); | |
c7f895a2 XG |
964 | |
965 | /* | |
966 | * Avoid to free 'prealloc' if it can be merged with | |
967 | * the later extent. | |
968 | */ | |
d1310b2e | 969 | err = insert_state(tree, prealloc, start, this_end, |
12cfbad9 | 970 | NULL, NULL, &bits); |
c2d904e0 JM |
971 | if (err) |
972 | extent_io_tree_panic(tree, err); | |
973 | ||
9ed74f2d JB |
974 | cache_state(prealloc, cached_state); |
975 | prealloc = NULL; | |
d1310b2e CM |
976 | start = this_end + 1; |
977 | goto search_again; | |
978 | } | |
979 | /* | |
980 | * | ---- desired range ---- | | |
981 | * | state | | |
982 | * We need to split the extent, and set the bit | |
983 | * on the first half | |
984 | */ | |
985 | if (state->start <= end && state->end > end) { | |
1edbb734 | 986 | if (state->state & exclusive_bits) { |
d1310b2e CM |
987 | *failed_start = start; |
988 | err = -EEXIST; | |
989 | goto out; | |
990 | } | |
8233767a XG |
991 | |
992 | prealloc = alloc_extent_state_atomic(prealloc); | |
993 | BUG_ON(!prealloc); | |
d1310b2e | 994 | err = split_state(tree, state, prealloc, end + 1); |
c2d904e0 JM |
995 | if (err) |
996 | extent_io_tree_panic(tree, err); | |
d1310b2e | 997 | |
1bf85046 | 998 | set_state_bits(tree, prealloc, &bits); |
2c64c53d | 999 | cache_state(prealloc, cached_state); |
d1310b2e CM |
1000 | merge_state(tree, prealloc); |
1001 | prealloc = NULL; | |
1002 | goto out; | |
1003 | } | |
1004 | ||
1005 | goto search_again; | |
1006 | ||
1007 | out: | |
cad321ad | 1008 | spin_unlock(&tree->lock); |
d1310b2e CM |
1009 | if (prealloc) |
1010 | free_extent_state(prealloc); | |
1011 | ||
1012 | return err; | |
1013 | ||
1014 | search_again: | |
1015 | if (start > end) | |
1016 | goto out; | |
cad321ad | 1017 | spin_unlock(&tree->lock); |
d1310b2e CM |
1018 | if (mask & __GFP_WAIT) |
1019 | cond_resched(); | |
1020 | goto again; | |
1021 | } | |
d1310b2e | 1022 | |
41074888 DS |
1023 | int set_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, |
1024 | unsigned long bits, u64 * failed_start, | |
1025 | struct extent_state **cached_state, gfp_t mask) | |
3fbe5c02 JM |
1026 | { |
1027 | return __set_extent_bit(tree, start, end, bits, 0, failed_start, | |
1028 | cached_state, mask); | |
1029 | } | |
1030 | ||
1031 | ||
462d6fac | 1032 | /** |
10983f2e LB |
1033 | * convert_extent_bit - convert all bits in a given range from one bit to |
1034 | * another | |
462d6fac JB |
1035 | * @tree: the io tree to search |
1036 | * @start: the start offset in bytes | |
1037 | * @end: the end offset in bytes (inclusive) | |
1038 | * @bits: the bits to set in this range | |
1039 | * @clear_bits: the bits to clear in this range | |
e6138876 | 1040 | * @cached_state: state that we're going to cache |
462d6fac JB |
1041 | * @mask: the allocation mask |
1042 | * | |
1043 | * This will go through and set bits for the given range. If any states exist | |
1044 | * already in this range they are set with the given bit and cleared of the | |
1045 | * clear_bits. This is only meant to be used by things that are mergeable, ie | |
1046 | * converting from say DELALLOC to DIRTY. This is not meant to be used with | |
1047 | * boundary bits like LOCK. | |
1048 | */ | |
1049 | int convert_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, | |
41074888 | 1050 | unsigned long bits, unsigned long clear_bits, |
e6138876 | 1051 | struct extent_state **cached_state, gfp_t mask) |
462d6fac JB |
1052 | { |
1053 | struct extent_state *state; | |
1054 | struct extent_state *prealloc = NULL; | |
1055 | struct rb_node *node; | |
12cfbad9 FDBM |
1056 | struct rb_node **p; |
1057 | struct rb_node *parent; | |
462d6fac JB |
1058 | int err = 0; |
1059 | u64 last_start; | |
1060 | u64 last_end; | |
1061 | ||
a5dee37d | 1062 | btrfs_debug_check_extent_io_range(tree, start, end); |
8d599ae1 | 1063 | |
462d6fac JB |
1064 | again: |
1065 | if (!prealloc && (mask & __GFP_WAIT)) { | |
1066 | prealloc = alloc_extent_state(mask); | |
1067 | if (!prealloc) | |
1068 | return -ENOMEM; | |
1069 | } | |
1070 | ||
1071 | spin_lock(&tree->lock); | |
e6138876 JB |
1072 | if (cached_state && *cached_state) { |
1073 | state = *cached_state; | |
1074 | if (state->start <= start && state->end > start && | |
27a3507d | 1075 | extent_state_in_tree(state)) { |
e6138876 JB |
1076 | node = &state->rb_node; |
1077 | goto hit_next; | |
1078 | } | |
1079 | } | |
1080 | ||
462d6fac JB |
1081 | /* |
1082 | * this search will find all the extents that end after | |
1083 | * our range starts. | |
1084 | */ | |
12cfbad9 | 1085 | node = tree_search_for_insert(tree, start, &p, &parent); |
462d6fac JB |
1086 | if (!node) { |
1087 | prealloc = alloc_extent_state_atomic(prealloc); | |
1cf4ffdb LB |
1088 | if (!prealloc) { |
1089 | err = -ENOMEM; | |
1090 | goto out; | |
1091 | } | |
12cfbad9 FDBM |
1092 | err = insert_state(tree, prealloc, start, end, |
1093 | &p, &parent, &bits); | |
c2d904e0 JM |
1094 | if (err) |
1095 | extent_io_tree_panic(tree, err); | |
c42ac0bc FDBM |
1096 | cache_state(prealloc, cached_state); |
1097 | prealloc = NULL; | |
462d6fac JB |
1098 | goto out; |
1099 | } | |
1100 | state = rb_entry(node, struct extent_state, rb_node); | |
1101 | hit_next: | |
1102 | last_start = state->start; | |
1103 | last_end = state->end; | |
1104 | ||
1105 | /* | |
1106 | * | ---- desired range ---- | | |
1107 | * | state | | |
1108 | * | |
1109 | * Just lock what we found and keep going | |
1110 | */ | |
1111 | if (state->start == start && state->end <= end) { | |
462d6fac | 1112 | set_state_bits(tree, state, &bits); |
e6138876 | 1113 | cache_state(state, cached_state); |
d1ac6e41 | 1114 | state = clear_state_bit(tree, state, &clear_bits, 0); |
462d6fac JB |
1115 | if (last_end == (u64)-1) |
1116 | goto out; | |
462d6fac | 1117 | start = last_end + 1; |
d1ac6e41 LB |
1118 | if (start < end && state && state->start == start && |
1119 | !need_resched()) | |
1120 | goto hit_next; | |
462d6fac JB |
1121 | goto search_again; |
1122 | } | |
1123 | ||
1124 | /* | |
1125 | * | ---- desired range ---- | | |
1126 | * | state | | |
1127 | * or | |
1128 | * | ------------- state -------------- | | |
1129 | * | |
1130 | * We need to split the extent we found, and may flip bits on | |
1131 | * second half. | |
1132 | * | |
1133 | * If the extent we found extends past our | |
1134 | * range, we just split and search again. It'll get split | |
1135 | * again the next time though. | |
1136 | * | |
1137 | * If the extent we found is inside our range, we set the | |
1138 | * desired bit on it. | |
1139 | */ | |
1140 | if (state->start < start) { | |
1141 | prealloc = alloc_extent_state_atomic(prealloc); | |
1cf4ffdb LB |
1142 | if (!prealloc) { |
1143 | err = -ENOMEM; | |
1144 | goto out; | |
1145 | } | |
462d6fac | 1146 | err = split_state(tree, state, prealloc, start); |
c2d904e0 JM |
1147 | if (err) |
1148 | extent_io_tree_panic(tree, err); | |
462d6fac JB |
1149 | prealloc = NULL; |
1150 | if (err) | |
1151 | goto out; | |
1152 | if (state->end <= end) { | |
1153 | set_state_bits(tree, state, &bits); | |
e6138876 | 1154 | cache_state(state, cached_state); |
d1ac6e41 | 1155 | state = clear_state_bit(tree, state, &clear_bits, 0); |
462d6fac JB |
1156 | if (last_end == (u64)-1) |
1157 | goto out; | |
1158 | start = last_end + 1; | |
d1ac6e41 LB |
1159 | if (start < end && state && state->start == start && |
1160 | !need_resched()) | |
1161 | goto hit_next; | |
462d6fac JB |
1162 | } |
1163 | goto search_again; | |
1164 | } | |
1165 | /* | |
1166 | * | ---- desired range ---- | | |
1167 | * | state | or | state | | |
1168 | * | |
1169 | * There's a hole, we need to insert something in it and | |
1170 | * ignore the extent we found. | |
1171 | */ | |
1172 | if (state->start > start) { | |
1173 | u64 this_end; | |
1174 | if (end < last_start) | |
1175 | this_end = end; | |
1176 | else | |
1177 | this_end = last_start - 1; | |
1178 | ||
1179 | prealloc = alloc_extent_state_atomic(prealloc); | |
1cf4ffdb LB |
1180 | if (!prealloc) { |
1181 | err = -ENOMEM; | |
1182 | goto out; | |
1183 | } | |
462d6fac JB |
1184 | |
1185 | /* | |
1186 | * Avoid to free 'prealloc' if it can be merged with | |
1187 | * the later extent. | |
1188 | */ | |
1189 | err = insert_state(tree, prealloc, start, this_end, | |
12cfbad9 | 1190 | NULL, NULL, &bits); |
c2d904e0 JM |
1191 | if (err) |
1192 | extent_io_tree_panic(tree, err); | |
e6138876 | 1193 | cache_state(prealloc, cached_state); |
462d6fac JB |
1194 | prealloc = NULL; |
1195 | start = this_end + 1; | |
1196 | goto search_again; | |
1197 | } | |
1198 | /* | |
1199 | * | ---- desired range ---- | | |
1200 | * | state | | |
1201 | * We need to split the extent, and set the bit | |
1202 | * on the first half | |
1203 | */ | |
1204 | if (state->start <= end && state->end > end) { | |
1205 | prealloc = alloc_extent_state_atomic(prealloc); | |
1cf4ffdb LB |
1206 | if (!prealloc) { |
1207 | err = -ENOMEM; | |
1208 | goto out; | |
1209 | } | |
462d6fac JB |
1210 | |
1211 | err = split_state(tree, state, prealloc, end + 1); | |
c2d904e0 JM |
1212 | if (err) |
1213 | extent_io_tree_panic(tree, err); | |
462d6fac JB |
1214 | |
1215 | set_state_bits(tree, prealloc, &bits); | |
e6138876 | 1216 | cache_state(prealloc, cached_state); |
462d6fac | 1217 | clear_state_bit(tree, prealloc, &clear_bits, 0); |
462d6fac JB |
1218 | prealloc = NULL; |
1219 | goto out; | |
1220 | } | |
1221 | ||
1222 | goto search_again; | |
1223 | ||
1224 | out: | |
1225 | spin_unlock(&tree->lock); | |
1226 | if (prealloc) | |
1227 | free_extent_state(prealloc); | |
1228 | ||
1229 | return err; | |
1230 | ||
1231 | search_again: | |
1232 | if (start > end) | |
1233 | goto out; | |
1234 | spin_unlock(&tree->lock); | |
1235 | if (mask & __GFP_WAIT) | |
1236 | cond_resched(); | |
1237 | goto again; | |
1238 | } | |
1239 | ||
d1310b2e CM |
1240 | /* wrappers around set/clear extent bit */ |
1241 | int set_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end, | |
1242 | gfp_t mask) | |
1243 | { | |
3fbe5c02 | 1244 | return set_extent_bit(tree, start, end, EXTENT_DIRTY, NULL, |
2c64c53d | 1245 | NULL, mask); |
d1310b2e | 1246 | } |
d1310b2e CM |
1247 | |
1248 | int set_extent_bits(struct extent_io_tree *tree, u64 start, u64 end, | |
41074888 | 1249 | unsigned long bits, gfp_t mask) |
d1310b2e | 1250 | { |
3fbe5c02 | 1251 | return set_extent_bit(tree, start, end, bits, NULL, |
2c64c53d | 1252 | NULL, mask); |
d1310b2e | 1253 | } |
d1310b2e CM |
1254 | |
1255 | int clear_extent_bits(struct extent_io_tree *tree, u64 start, u64 end, | |
41074888 | 1256 | unsigned long bits, gfp_t mask) |
d1310b2e | 1257 | { |
2c64c53d | 1258 | return clear_extent_bit(tree, start, end, bits, 0, 0, NULL, mask); |
d1310b2e | 1259 | } |
d1310b2e CM |
1260 | |
1261 | int set_extent_delalloc(struct extent_io_tree *tree, u64 start, u64 end, | |
2ac55d41 | 1262 | struct extent_state **cached_state, gfp_t mask) |
d1310b2e CM |
1263 | { |
1264 | return set_extent_bit(tree, start, end, | |
fee187d9 | 1265 | EXTENT_DELALLOC | EXTENT_UPTODATE, |
3fbe5c02 | 1266 | NULL, cached_state, mask); |
d1310b2e | 1267 | } |
d1310b2e | 1268 | |
9e8a4a8b LB |
1269 | int set_extent_defrag(struct extent_io_tree *tree, u64 start, u64 end, |
1270 | struct extent_state **cached_state, gfp_t mask) | |
1271 | { | |
1272 | return set_extent_bit(tree, start, end, | |
1273 | EXTENT_DELALLOC | EXTENT_UPTODATE | EXTENT_DEFRAG, | |
1274 | NULL, cached_state, mask); | |
1275 | } | |
1276 | ||
d1310b2e CM |
1277 | int clear_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end, |
1278 | gfp_t mask) | |
1279 | { | |
1280 | return clear_extent_bit(tree, start, end, | |
32c00aff | 1281 | EXTENT_DIRTY | EXTENT_DELALLOC | |
0ca1f7ce | 1282 | EXTENT_DO_ACCOUNTING, 0, 0, NULL, mask); |
d1310b2e | 1283 | } |
d1310b2e CM |
1284 | |
1285 | int set_extent_new(struct extent_io_tree *tree, u64 start, u64 end, | |
1286 | gfp_t mask) | |
1287 | { | |
3fbe5c02 | 1288 | return set_extent_bit(tree, start, end, EXTENT_NEW, NULL, |
2c64c53d | 1289 | NULL, mask); |
d1310b2e | 1290 | } |
d1310b2e | 1291 | |
d1310b2e | 1292 | int set_extent_uptodate(struct extent_io_tree *tree, u64 start, u64 end, |
507903b8 | 1293 | struct extent_state **cached_state, gfp_t mask) |
d1310b2e | 1294 | { |
6b67a320 | 1295 | return set_extent_bit(tree, start, end, EXTENT_UPTODATE, NULL, |
3fbe5c02 | 1296 | cached_state, mask); |
d1310b2e | 1297 | } |
d1310b2e | 1298 | |
5fd02043 JB |
1299 | int clear_extent_uptodate(struct extent_io_tree *tree, u64 start, u64 end, |
1300 | struct extent_state **cached_state, gfp_t mask) | |
d1310b2e | 1301 | { |
2c64c53d | 1302 | return clear_extent_bit(tree, start, end, EXTENT_UPTODATE, 0, 0, |
2ac55d41 | 1303 | cached_state, mask); |
d1310b2e | 1304 | } |
d1310b2e | 1305 | |
d352ac68 CM |
1306 | /* |
1307 | * either insert or lock state struct between start and end use mask to tell | |
1308 | * us if waiting is desired. | |
1309 | */ | |
1edbb734 | 1310 | int lock_extent_bits(struct extent_io_tree *tree, u64 start, u64 end, |
41074888 | 1311 | unsigned long bits, struct extent_state **cached_state) |
d1310b2e CM |
1312 | { |
1313 | int err; | |
1314 | u64 failed_start; | |
1315 | while (1) { | |
3fbe5c02 JM |
1316 | err = __set_extent_bit(tree, start, end, EXTENT_LOCKED | bits, |
1317 | EXTENT_LOCKED, &failed_start, | |
1318 | cached_state, GFP_NOFS); | |
d0082371 | 1319 | if (err == -EEXIST) { |
d1310b2e CM |
1320 | wait_extent_bit(tree, failed_start, end, EXTENT_LOCKED); |
1321 | start = failed_start; | |
d0082371 | 1322 | } else |
d1310b2e | 1323 | break; |
d1310b2e CM |
1324 | WARN_ON(start > end); |
1325 | } | |
1326 | return err; | |
1327 | } | |
d1310b2e | 1328 | |
d0082371 | 1329 | int lock_extent(struct extent_io_tree *tree, u64 start, u64 end) |
1edbb734 | 1330 | { |
d0082371 | 1331 | return lock_extent_bits(tree, start, end, 0, NULL); |
1edbb734 CM |
1332 | } |
1333 | ||
d0082371 | 1334 | int try_lock_extent(struct extent_io_tree *tree, u64 start, u64 end) |
25179201 JB |
1335 | { |
1336 | int err; | |
1337 | u64 failed_start; | |
1338 | ||
3fbe5c02 JM |
1339 | err = __set_extent_bit(tree, start, end, EXTENT_LOCKED, EXTENT_LOCKED, |
1340 | &failed_start, NULL, GFP_NOFS); | |
6643558d YZ |
1341 | if (err == -EEXIST) { |
1342 | if (failed_start > start) | |
1343 | clear_extent_bit(tree, start, failed_start - 1, | |
d0082371 | 1344 | EXTENT_LOCKED, 1, 0, NULL, GFP_NOFS); |
25179201 | 1345 | return 0; |
6643558d | 1346 | } |
25179201 JB |
1347 | return 1; |
1348 | } | |
25179201 | 1349 | |
2c64c53d CM |
1350 | int unlock_extent_cached(struct extent_io_tree *tree, u64 start, u64 end, |
1351 | struct extent_state **cached, gfp_t mask) | |
1352 | { | |
1353 | return clear_extent_bit(tree, start, end, EXTENT_LOCKED, 1, 0, cached, | |
1354 | mask); | |
1355 | } | |
1356 | ||
d0082371 | 1357 | int unlock_extent(struct extent_io_tree *tree, u64 start, u64 end) |
d1310b2e | 1358 | { |
2c64c53d | 1359 | return clear_extent_bit(tree, start, end, EXTENT_LOCKED, 1, 0, NULL, |
d0082371 | 1360 | GFP_NOFS); |
d1310b2e | 1361 | } |
d1310b2e | 1362 | |
4adaa611 CM |
1363 | int extent_range_clear_dirty_for_io(struct inode *inode, u64 start, u64 end) |
1364 | { | |
1365 | unsigned long index = start >> PAGE_CACHE_SHIFT; | |
1366 | unsigned long end_index = end >> PAGE_CACHE_SHIFT; | |
1367 | struct page *page; | |
1368 | ||
1369 | while (index <= end_index) { | |
1370 | page = find_get_page(inode->i_mapping, index); | |
1371 | BUG_ON(!page); /* Pages should be in the extent_io_tree */ | |
1372 | clear_page_dirty_for_io(page); | |
1373 | page_cache_release(page); | |
1374 | index++; | |
1375 | } | |
1376 | return 0; | |
1377 | } | |
1378 | ||
1379 | int extent_range_redirty_for_io(struct inode *inode, u64 start, u64 end) | |
1380 | { | |
1381 | unsigned long index = start >> PAGE_CACHE_SHIFT; | |
1382 | unsigned long end_index = end >> PAGE_CACHE_SHIFT; | |
1383 | struct page *page; | |
1384 | ||
1385 | while (index <= end_index) { | |
1386 | page = find_get_page(inode->i_mapping, index); | |
1387 | BUG_ON(!page); /* Pages should be in the extent_io_tree */ | |
1388 | account_page_redirty(page); | |
1389 | __set_page_dirty_nobuffers(page); | |
1390 | page_cache_release(page); | |
1391 | index++; | |
1392 | } | |
1393 | return 0; | |
1394 | } | |
1395 | ||
d1310b2e CM |
1396 | /* |
1397 | * helper function to set both pages and extents in the tree writeback | |
1398 | */ | |
b2950863 | 1399 | static int set_range_writeback(struct extent_io_tree *tree, u64 start, u64 end) |
d1310b2e CM |
1400 | { |
1401 | unsigned long index = start >> PAGE_CACHE_SHIFT; | |
1402 | unsigned long end_index = end >> PAGE_CACHE_SHIFT; | |
1403 | struct page *page; | |
1404 | ||
1405 | while (index <= end_index) { | |
1406 | page = find_get_page(tree->mapping, index); | |
79787eaa | 1407 | BUG_ON(!page); /* Pages should be in the extent_io_tree */ |
d1310b2e CM |
1408 | set_page_writeback(page); |
1409 | page_cache_release(page); | |
1410 | index++; | |
1411 | } | |
d1310b2e CM |
1412 | return 0; |
1413 | } | |
d1310b2e | 1414 | |
d352ac68 CM |
1415 | /* find the first state struct with 'bits' set after 'start', and |
1416 | * return it. tree->lock must be held. NULL will returned if | |
1417 | * nothing was found after 'start' | |
1418 | */ | |
48a3b636 ES |
1419 | static struct extent_state * |
1420 | find_first_extent_bit_state(struct extent_io_tree *tree, | |
41074888 | 1421 | u64 start, unsigned long bits) |
d7fc640e CM |
1422 | { |
1423 | struct rb_node *node; | |
1424 | struct extent_state *state; | |
1425 | ||
1426 | /* | |
1427 | * this search will find all the extents that end after | |
1428 | * our range starts. | |
1429 | */ | |
1430 | node = tree_search(tree, start); | |
d397712b | 1431 | if (!node) |
d7fc640e | 1432 | goto out; |
d7fc640e | 1433 | |
d397712b | 1434 | while (1) { |
d7fc640e | 1435 | state = rb_entry(node, struct extent_state, rb_node); |
d397712b | 1436 | if (state->end >= start && (state->state & bits)) |
d7fc640e | 1437 | return state; |
d397712b | 1438 | |
d7fc640e CM |
1439 | node = rb_next(node); |
1440 | if (!node) | |
1441 | break; | |
1442 | } | |
1443 | out: | |
1444 | return NULL; | |
1445 | } | |
d7fc640e | 1446 | |
69261c4b XG |
1447 | /* |
1448 | * find the first offset in the io tree with 'bits' set. zero is | |
1449 | * returned if we find something, and *start_ret and *end_ret are | |
1450 | * set to reflect the state struct that was found. | |
1451 | * | |
477d7eaf | 1452 | * If nothing was found, 1 is returned. If found something, return 0. |
69261c4b XG |
1453 | */ |
1454 | int find_first_extent_bit(struct extent_io_tree *tree, u64 start, | |
41074888 | 1455 | u64 *start_ret, u64 *end_ret, unsigned long bits, |
e6138876 | 1456 | struct extent_state **cached_state) |
69261c4b XG |
1457 | { |
1458 | struct extent_state *state; | |
e6138876 | 1459 | struct rb_node *n; |
69261c4b XG |
1460 | int ret = 1; |
1461 | ||
1462 | spin_lock(&tree->lock); | |
e6138876 JB |
1463 | if (cached_state && *cached_state) { |
1464 | state = *cached_state; | |
27a3507d | 1465 | if (state->end == start - 1 && extent_state_in_tree(state)) { |
e6138876 JB |
1466 | n = rb_next(&state->rb_node); |
1467 | while (n) { | |
1468 | state = rb_entry(n, struct extent_state, | |
1469 | rb_node); | |
1470 | if (state->state & bits) | |
1471 | goto got_it; | |
1472 | n = rb_next(n); | |
1473 | } | |
1474 | free_extent_state(*cached_state); | |
1475 | *cached_state = NULL; | |
1476 | goto out; | |
1477 | } | |
1478 | free_extent_state(*cached_state); | |
1479 | *cached_state = NULL; | |
1480 | } | |
1481 | ||
69261c4b | 1482 | state = find_first_extent_bit_state(tree, start, bits); |
e6138876 | 1483 | got_it: |
69261c4b | 1484 | if (state) { |
e6138876 | 1485 | cache_state(state, cached_state); |
69261c4b XG |
1486 | *start_ret = state->start; |
1487 | *end_ret = state->end; | |
1488 | ret = 0; | |
1489 | } | |
e6138876 | 1490 | out: |
69261c4b XG |
1491 | spin_unlock(&tree->lock); |
1492 | return ret; | |
1493 | } | |
1494 | ||
d352ac68 CM |
1495 | /* |
1496 | * find a contiguous range of bytes in the file marked as delalloc, not | |
1497 | * more than 'max_bytes'. start and end are used to return the range, | |
1498 | * | |
1499 | * 1 is returned if we find something, 0 if nothing was in the tree | |
1500 | */ | |
c8b97818 | 1501 | static noinline u64 find_delalloc_range(struct extent_io_tree *tree, |
c2a128d2 JB |
1502 | u64 *start, u64 *end, u64 max_bytes, |
1503 | struct extent_state **cached_state) | |
d1310b2e CM |
1504 | { |
1505 | struct rb_node *node; | |
1506 | struct extent_state *state; | |
1507 | u64 cur_start = *start; | |
1508 | u64 found = 0; | |
1509 | u64 total_bytes = 0; | |
1510 | ||
cad321ad | 1511 | spin_lock(&tree->lock); |
c8b97818 | 1512 | |
d1310b2e CM |
1513 | /* |
1514 | * this search will find all the extents that end after | |
1515 | * our range starts. | |
1516 | */ | |
80ea96b1 | 1517 | node = tree_search(tree, cur_start); |
2b114d1d | 1518 | if (!node) { |
3b951516 CM |
1519 | if (!found) |
1520 | *end = (u64)-1; | |
d1310b2e CM |
1521 | goto out; |
1522 | } | |
1523 | ||
d397712b | 1524 | while (1) { |
d1310b2e | 1525 | state = rb_entry(node, struct extent_state, rb_node); |
5b21f2ed ZY |
1526 | if (found && (state->start != cur_start || |
1527 | (state->state & EXTENT_BOUNDARY))) { | |
d1310b2e CM |
1528 | goto out; |
1529 | } | |
1530 | if (!(state->state & EXTENT_DELALLOC)) { | |
1531 | if (!found) | |
1532 | *end = state->end; | |
1533 | goto out; | |
1534 | } | |
c2a128d2 | 1535 | if (!found) { |
d1310b2e | 1536 | *start = state->start; |
c2a128d2 JB |
1537 | *cached_state = state; |
1538 | atomic_inc(&state->refs); | |
1539 | } | |
d1310b2e CM |
1540 | found++; |
1541 | *end = state->end; | |
1542 | cur_start = state->end + 1; | |
1543 | node = rb_next(node); | |
d1310b2e | 1544 | total_bytes += state->end - state->start + 1; |
7bf811a5 | 1545 | if (total_bytes >= max_bytes) |
573aecaf | 1546 | break; |
573aecaf | 1547 | if (!node) |
d1310b2e CM |
1548 | break; |
1549 | } | |
1550 | out: | |
cad321ad | 1551 | spin_unlock(&tree->lock); |
d1310b2e CM |
1552 | return found; |
1553 | } | |
1554 | ||
143bede5 JM |
1555 | static noinline void __unlock_for_delalloc(struct inode *inode, |
1556 | struct page *locked_page, | |
1557 | u64 start, u64 end) | |
c8b97818 CM |
1558 | { |
1559 | int ret; | |
1560 | struct page *pages[16]; | |
1561 | unsigned long index = start >> PAGE_CACHE_SHIFT; | |
1562 | unsigned long end_index = end >> PAGE_CACHE_SHIFT; | |
1563 | unsigned long nr_pages = end_index - index + 1; | |
1564 | int i; | |
1565 | ||
1566 | if (index == locked_page->index && end_index == index) | |
143bede5 | 1567 | return; |
c8b97818 | 1568 | |
d397712b | 1569 | while (nr_pages > 0) { |
c8b97818 | 1570 | ret = find_get_pages_contig(inode->i_mapping, index, |
5b050f04 CM |
1571 | min_t(unsigned long, nr_pages, |
1572 | ARRAY_SIZE(pages)), pages); | |
c8b97818 CM |
1573 | for (i = 0; i < ret; i++) { |
1574 | if (pages[i] != locked_page) | |
1575 | unlock_page(pages[i]); | |
1576 | page_cache_release(pages[i]); | |
1577 | } | |
1578 | nr_pages -= ret; | |
1579 | index += ret; | |
1580 | cond_resched(); | |
1581 | } | |
c8b97818 CM |
1582 | } |
1583 | ||
1584 | static noinline int lock_delalloc_pages(struct inode *inode, | |
1585 | struct page *locked_page, | |
1586 | u64 delalloc_start, | |
1587 | u64 delalloc_end) | |
1588 | { | |
1589 | unsigned long index = delalloc_start >> PAGE_CACHE_SHIFT; | |
1590 | unsigned long start_index = index; | |
1591 | unsigned long end_index = delalloc_end >> PAGE_CACHE_SHIFT; | |
1592 | unsigned long pages_locked = 0; | |
1593 | struct page *pages[16]; | |
1594 | unsigned long nrpages; | |
1595 | int ret; | |
1596 | int i; | |
1597 | ||
1598 | /* the caller is responsible for locking the start index */ | |
1599 | if (index == locked_page->index && index == end_index) | |
1600 | return 0; | |
1601 | ||
1602 | /* skip the page at the start index */ | |
1603 | nrpages = end_index - index + 1; | |
d397712b | 1604 | while (nrpages > 0) { |
c8b97818 | 1605 | ret = find_get_pages_contig(inode->i_mapping, index, |
5b050f04 CM |
1606 | min_t(unsigned long, |
1607 | nrpages, ARRAY_SIZE(pages)), pages); | |
c8b97818 CM |
1608 | if (ret == 0) { |
1609 | ret = -EAGAIN; | |
1610 | goto done; | |
1611 | } | |
1612 | /* now we have an array of pages, lock them all */ | |
1613 | for (i = 0; i < ret; i++) { | |
1614 | /* | |
1615 | * the caller is taking responsibility for | |
1616 | * locked_page | |
1617 | */ | |
771ed689 | 1618 | if (pages[i] != locked_page) { |
c8b97818 | 1619 | lock_page(pages[i]); |
f2b1c41c CM |
1620 | if (!PageDirty(pages[i]) || |
1621 | pages[i]->mapping != inode->i_mapping) { | |
771ed689 CM |
1622 | ret = -EAGAIN; |
1623 | unlock_page(pages[i]); | |
1624 | page_cache_release(pages[i]); | |
1625 | goto done; | |
1626 | } | |
1627 | } | |
c8b97818 | 1628 | page_cache_release(pages[i]); |
771ed689 | 1629 | pages_locked++; |
c8b97818 | 1630 | } |
c8b97818 CM |
1631 | nrpages -= ret; |
1632 | index += ret; | |
1633 | cond_resched(); | |
1634 | } | |
1635 | ret = 0; | |
1636 | done: | |
1637 | if (ret && pages_locked) { | |
1638 | __unlock_for_delalloc(inode, locked_page, | |
1639 | delalloc_start, | |
1640 | ((u64)(start_index + pages_locked - 1)) << | |
1641 | PAGE_CACHE_SHIFT); | |
1642 | } | |
1643 | return ret; | |
1644 | } | |
1645 | ||
1646 | /* | |
1647 | * find a contiguous range of bytes in the file marked as delalloc, not | |
1648 | * more than 'max_bytes'. start and end are used to return the range, | |
1649 | * | |
1650 | * 1 is returned if we find something, 0 if nothing was in the tree | |
1651 | */ | |
294e30fe JB |
1652 | STATIC u64 find_lock_delalloc_range(struct inode *inode, |
1653 | struct extent_io_tree *tree, | |
1654 | struct page *locked_page, u64 *start, | |
1655 | u64 *end, u64 max_bytes) | |
c8b97818 CM |
1656 | { |
1657 | u64 delalloc_start; | |
1658 | u64 delalloc_end; | |
1659 | u64 found; | |
9655d298 | 1660 | struct extent_state *cached_state = NULL; |
c8b97818 CM |
1661 | int ret; |
1662 | int loops = 0; | |
1663 | ||
1664 | again: | |
1665 | /* step one, find a bunch of delalloc bytes starting at start */ | |
1666 | delalloc_start = *start; | |
1667 | delalloc_end = 0; | |
1668 | found = find_delalloc_range(tree, &delalloc_start, &delalloc_end, | |
c2a128d2 | 1669 | max_bytes, &cached_state); |
70b99e69 | 1670 | if (!found || delalloc_end <= *start) { |
c8b97818 CM |
1671 | *start = delalloc_start; |
1672 | *end = delalloc_end; | |
c2a128d2 | 1673 | free_extent_state(cached_state); |
385fe0be | 1674 | return 0; |
c8b97818 CM |
1675 | } |
1676 | ||
70b99e69 CM |
1677 | /* |
1678 | * start comes from the offset of locked_page. We have to lock | |
1679 | * pages in order, so we can't process delalloc bytes before | |
1680 | * locked_page | |
1681 | */ | |
d397712b | 1682 | if (delalloc_start < *start) |
70b99e69 | 1683 | delalloc_start = *start; |
70b99e69 | 1684 | |
c8b97818 CM |
1685 | /* |
1686 | * make sure to limit the number of pages we try to lock down | |
c8b97818 | 1687 | */ |
7bf811a5 JB |
1688 | if (delalloc_end + 1 - delalloc_start > max_bytes) |
1689 | delalloc_end = delalloc_start + max_bytes - 1; | |
d397712b | 1690 | |
c8b97818 CM |
1691 | /* step two, lock all the pages after the page that has start */ |
1692 | ret = lock_delalloc_pages(inode, locked_page, | |
1693 | delalloc_start, delalloc_end); | |
1694 | if (ret == -EAGAIN) { | |
1695 | /* some of the pages are gone, lets avoid looping by | |
1696 | * shortening the size of the delalloc range we're searching | |
1697 | */ | |
9655d298 | 1698 | free_extent_state(cached_state); |
7d788742 | 1699 | cached_state = NULL; |
c8b97818 | 1700 | if (!loops) { |
7bf811a5 | 1701 | max_bytes = PAGE_CACHE_SIZE; |
c8b97818 CM |
1702 | loops = 1; |
1703 | goto again; | |
1704 | } else { | |
1705 | found = 0; | |
1706 | goto out_failed; | |
1707 | } | |
1708 | } | |
79787eaa | 1709 | BUG_ON(ret); /* Only valid values are 0 and -EAGAIN */ |
c8b97818 CM |
1710 | |
1711 | /* step three, lock the state bits for the whole range */ | |
d0082371 | 1712 | lock_extent_bits(tree, delalloc_start, delalloc_end, 0, &cached_state); |
c8b97818 CM |
1713 | |
1714 | /* then test to make sure it is all still delalloc */ | |
1715 | ret = test_range_bit(tree, delalloc_start, delalloc_end, | |
9655d298 | 1716 | EXTENT_DELALLOC, 1, cached_state); |
c8b97818 | 1717 | if (!ret) { |
9655d298 CM |
1718 | unlock_extent_cached(tree, delalloc_start, delalloc_end, |
1719 | &cached_state, GFP_NOFS); | |
c8b97818 CM |
1720 | __unlock_for_delalloc(inode, locked_page, |
1721 | delalloc_start, delalloc_end); | |
1722 | cond_resched(); | |
1723 | goto again; | |
1724 | } | |
9655d298 | 1725 | free_extent_state(cached_state); |
c8b97818 CM |
1726 | *start = delalloc_start; |
1727 | *end = delalloc_end; | |
1728 | out_failed: | |
1729 | return found; | |
1730 | } | |
1731 | ||
c2790a2e JB |
1732 | int extent_clear_unlock_delalloc(struct inode *inode, u64 start, u64 end, |
1733 | struct page *locked_page, | |
1734 | unsigned long clear_bits, | |
1735 | unsigned long page_ops) | |
c8b97818 | 1736 | { |
c2790a2e | 1737 | struct extent_io_tree *tree = &BTRFS_I(inode)->io_tree; |
c8b97818 CM |
1738 | int ret; |
1739 | struct page *pages[16]; | |
1740 | unsigned long index = start >> PAGE_CACHE_SHIFT; | |
1741 | unsigned long end_index = end >> PAGE_CACHE_SHIFT; | |
1742 | unsigned long nr_pages = end_index - index + 1; | |
1743 | int i; | |
771ed689 | 1744 | |
2c64c53d | 1745 | clear_extent_bit(tree, start, end, clear_bits, 1, 0, NULL, GFP_NOFS); |
c2790a2e | 1746 | if (page_ops == 0) |
771ed689 | 1747 | return 0; |
c8b97818 | 1748 | |
d397712b | 1749 | while (nr_pages > 0) { |
c8b97818 | 1750 | ret = find_get_pages_contig(inode->i_mapping, index, |
5b050f04 CM |
1751 | min_t(unsigned long, |
1752 | nr_pages, ARRAY_SIZE(pages)), pages); | |
c8b97818 | 1753 | for (i = 0; i < ret; i++) { |
8b62b72b | 1754 | |
c2790a2e | 1755 | if (page_ops & PAGE_SET_PRIVATE2) |
8b62b72b CM |
1756 | SetPagePrivate2(pages[i]); |
1757 | ||
c8b97818 CM |
1758 | if (pages[i] == locked_page) { |
1759 | page_cache_release(pages[i]); | |
1760 | continue; | |
1761 | } | |
c2790a2e | 1762 | if (page_ops & PAGE_CLEAR_DIRTY) |
c8b97818 | 1763 | clear_page_dirty_for_io(pages[i]); |
c2790a2e | 1764 | if (page_ops & PAGE_SET_WRITEBACK) |
c8b97818 | 1765 | set_page_writeback(pages[i]); |
c2790a2e | 1766 | if (page_ops & PAGE_END_WRITEBACK) |
c8b97818 | 1767 | end_page_writeback(pages[i]); |
c2790a2e | 1768 | if (page_ops & PAGE_UNLOCK) |
771ed689 | 1769 | unlock_page(pages[i]); |
c8b97818 CM |
1770 | page_cache_release(pages[i]); |
1771 | } | |
1772 | nr_pages -= ret; | |
1773 | index += ret; | |
1774 | cond_resched(); | |
1775 | } | |
1776 | return 0; | |
1777 | } | |
c8b97818 | 1778 | |
d352ac68 CM |
1779 | /* |
1780 | * count the number of bytes in the tree that have a given bit(s) | |
1781 | * set. This can be fairly slow, except for EXTENT_DIRTY which is | |
1782 | * cached. The total number found is returned. | |
1783 | */ | |
d1310b2e CM |
1784 | u64 count_range_bits(struct extent_io_tree *tree, |
1785 | u64 *start, u64 search_end, u64 max_bytes, | |
ec29ed5b | 1786 | unsigned long bits, int contig) |
d1310b2e CM |
1787 | { |
1788 | struct rb_node *node; | |
1789 | struct extent_state *state; | |
1790 | u64 cur_start = *start; | |
1791 | u64 total_bytes = 0; | |
ec29ed5b | 1792 | u64 last = 0; |
d1310b2e CM |
1793 | int found = 0; |
1794 | ||
fae7f21c | 1795 | if (WARN_ON(search_end <= cur_start)) |
d1310b2e | 1796 | return 0; |
d1310b2e | 1797 | |
cad321ad | 1798 | spin_lock(&tree->lock); |
d1310b2e CM |
1799 | if (cur_start == 0 && bits == EXTENT_DIRTY) { |
1800 | total_bytes = tree->dirty_bytes; | |
1801 | goto out; | |
1802 | } | |
1803 | /* | |
1804 | * this search will find all the extents that end after | |
1805 | * our range starts. | |
1806 | */ | |
80ea96b1 | 1807 | node = tree_search(tree, cur_start); |
d397712b | 1808 | if (!node) |
d1310b2e | 1809 | goto out; |
d1310b2e | 1810 | |
d397712b | 1811 | while (1) { |
d1310b2e CM |
1812 | state = rb_entry(node, struct extent_state, rb_node); |
1813 | if (state->start > search_end) | |
1814 | break; | |
ec29ed5b CM |
1815 | if (contig && found && state->start > last + 1) |
1816 | break; | |
1817 | if (state->end >= cur_start && (state->state & bits) == bits) { | |
d1310b2e CM |
1818 | total_bytes += min(search_end, state->end) + 1 - |
1819 | max(cur_start, state->start); | |
1820 | if (total_bytes >= max_bytes) | |
1821 | break; | |
1822 | if (!found) { | |
af60bed2 | 1823 | *start = max(cur_start, state->start); |
d1310b2e CM |
1824 | found = 1; |
1825 | } | |
ec29ed5b CM |
1826 | last = state->end; |
1827 | } else if (contig && found) { | |
1828 | break; | |
d1310b2e CM |
1829 | } |
1830 | node = rb_next(node); | |
1831 | if (!node) | |
1832 | break; | |
1833 | } | |
1834 | out: | |
cad321ad | 1835 | spin_unlock(&tree->lock); |
d1310b2e CM |
1836 | return total_bytes; |
1837 | } | |
b2950863 | 1838 | |
d352ac68 CM |
1839 | /* |
1840 | * set the private field for a given byte offset in the tree. If there isn't | |
1841 | * an extent_state there already, this does nothing. | |
1842 | */ | |
171170c1 | 1843 | static int set_state_private(struct extent_io_tree *tree, u64 start, u64 private) |
d1310b2e CM |
1844 | { |
1845 | struct rb_node *node; | |
1846 | struct extent_state *state; | |
1847 | int ret = 0; | |
1848 | ||
cad321ad | 1849 | spin_lock(&tree->lock); |
d1310b2e CM |
1850 | /* |
1851 | * this search will find all the extents that end after | |
1852 | * our range starts. | |
1853 | */ | |
80ea96b1 | 1854 | node = tree_search(tree, start); |
2b114d1d | 1855 | if (!node) { |
d1310b2e CM |
1856 | ret = -ENOENT; |
1857 | goto out; | |
1858 | } | |
1859 | state = rb_entry(node, struct extent_state, rb_node); | |
1860 | if (state->start != start) { | |
1861 | ret = -ENOENT; | |
1862 | goto out; | |
1863 | } | |
1864 | state->private = private; | |
1865 | out: | |
cad321ad | 1866 | spin_unlock(&tree->lock); |
d1310b2e CM |
1867 | return ret; |
1868 | } | |
1869 | ||
1870 | int get_state_private(struct extent_io_tree *tree, u64 start, u64 *private) | |
1871 | { | |
1872 | struct rb_node *node; | |
1873 | struct extent_state *state; | |
1874 | int ret = 0; | |
1875 | ||
cad321ad | 1876 | spin_lock(&tree->lock); |
d1310b2e CM |
1877 | /* |
1878 | * this search will find all the extents that end after | |
1879 | * our range starts. | |
1880 | */ | |
80ea96b1 | 1881 | node = tree_search(tree, start); |
2b114d1d | 1882 | if (!node) { |
d1310b2e CM |
1883 | ret = -ENOENT; |
1884 | goto out; | |
1885 | } | |
1886 | state = rb_entry(node, struct extent_state, rb_node); | |
1887 | if (state->start != start) { | |
1888 | ret = -ENOENT; | |
1889 | goto out; | |
1890 | } | |
1891 | *private = state->private; | |
1892 | out: | |
cad321ad | 1893 | spin_unlock(&tree->lock); |
d1310b2e CM |
1894 | return ret; |
1895 | } | |
1896 | ||
1897 | /* | |
1898 | * searches a range in the state tree for a given mask. | |
70dec807 | 1899 | * If 'filled' == 1, this returns 1 only if every extent in the tree |
d1310b2e CM |
1900 | * has the bits set. Otherwise, 1 is returned if any bit in the |
1901 | * range is found set. | |
1902 | */ | |
1903 | int test_range_bit(struct extent_io_tree *tree, u64 start, u64 end, | |
41074888 | 1904 | unsigned long bits, int filled, struct extent_state *cached) |
d1310b2e CM |
1905 | { |
1906 | struct extent_state *state = NULL; | |
1907 | struct rb_node *node; | |
1908 | int bitset = 0; | |
d1310b2e | 1909 | |
cad321ad | 1910 | spin_lock(&tree->lock); |
27a3507d | 1911 | if (cached && extent_state_in_tree(cached) && cached->start <= start && |
df98b6e2 | 1912 | cached->end > start) |
9655d298 CM |
1913 | node = &cached->rb_node; |
1914 | else | |
1915 | node = tree_search(tree, start); | |
d1310b2e CM |
1916 | while (node && start <= end) { |
1917 | state = rb_entry(node, struct extent_state, rb_node); | |
1918 | ||
1919 | if (filled && state->start > start) { | |
1920 | bitset = 0; | |
1921 | break; | |
1922 | } | |
1923 | ||
1924 | if (state->start > end) | |
1925 | break; | |
1926 | ||
1927 | if (state->state & bits) { | |
1928 | bitset = 1; | |
1929 | if (!filled) | |
1930 | break; | |
1931 | } else if (filled) { | |
1932 | bitset = 0; | |
1933 | break; | |
1934 | } | |
46562cec CM |
1935 | |
1936 | if (state->end == (u64)-1) | |
1937 | break; | |
1938 | ||
d1310b2e CM |
1939 | start = state->end + 1; |
1940 | if (start > end) | |
1941 | break; | |
1942 | node = rb_next(node); | |
1943 | if (!node) { | |
1944 | if (filled) | |
1945 | bitset = 0; | |
1946 | break; | |
1947 | } | |
1948 | } | |
cad321ad | 1949 | spin_unlock(&tree->lock); |
d1310b2e CM |
1950 | return bitset; |
1951 | } | |
d1310b2e CM |
1952 | |
1953 | /* | |
1954 | * helper function to set a given page up to date if all the | |
1955 | * extents in the tree for that page are up to date | |
1956 | */ | |
143bede5 | 1957 | static void check_page_uptodate(struct extent_io_tree *tree, struct page *page) |
d1310b2e | 1958 | { |
4eee4fa4 | 1959 | u64 start = page_offset(page); |
d1310b2e | 1960 | u64 end = start + PAGE_CACHE_SIZE - 1; |
9655d298 | 1961 | if (test_range_bit(tree, start, end, EXTENT_UPTODATE, 1, NULL)) |
d1310b2e | 1962 | SetPageUptodate(page); |
d1310b2e CM |
1963 | } |
1964 | ||
454ff3de | 1965 | static int free_io_failure(struct inode *inode, struct io_failure_record *rec) |
4a54c8c1 JS |
1966 | { |
1967 | int ret; | |
1968 | int err = 0; | |
1969 | struct extent_io_tree *failure_tree = &BTRFS_I(inode)->io_failure_tree; | |
1970 | ||
1971 | set_state_private(failure_tree, rec->start, 0); | |
1972 | ret = clear_extent_bits(failure_tree, rec->start, | |
1973 | rec->start + rec->len - 1, | |
1974 | EXTENT_LOCKED | EXTENT_DIRTY, GFP_NOFS); | |
1975 | if (ret) | |
1976 | err = ret; | |
1977 | ||
53b381b3 DW |
1978 | ret = clear_extent_bits(&BTRFS_I(inode)->io_tree, rec->start, |
1979 | rec->start + rec->len - 1, | |
1980 | EXTENT_DAMAGED, GFP_NOFS); | |
1981 | if (ret && !err) | |
1982 | err = ret; | |
4a54c8c1 JS |
1983 | |
1984 | kfree(rec); | |
1985 | return err; | |
1986 | } | |
1987 | ||
4a54c8c1 JS |
1988 | /* |
1989 | * this bypasses the standard btrfs submit functions deliberately, as | |
1990 | * the standard behavior is to write all copies in a raid setup. here we only | |
1991 | * want to write the one bad copy. so we do the mapping for ourselves and issue | |
1992 | * submit_bio directly. | |
3ec706c8 | 1993 | * to avoid any synchronization issues, wait for the data after writing, which |
4a54c8c1 JS |
1994 | * actually prevents the read that triggered the error from finishing. |
1995 | * currently, there can be no more than two copies of every data bit. thus, | |
1996 | * exactly one rewrite is required. | |
1997 | */ | |
3ec706c8 | 1998 | int repair_io_failure(struct btrfs_fs_info *fs_info, u64 start, |
4a54c8c1 | 1999 | u64 length, u64 logical, struct page *page, |
ffdd2018 | 2000 | unsigned int pg_offset, int mirror_num) |
4a54c8c1 JS |
2001 | { |
2002 | struct bio *bio; | |
2003 | struct btrfs_device *dev; | |
4a54c8c1 JS |
2004 | u64 map_length = 0; |
2005 | u64 sector; | |
2006 | struct btrfs_bio *bbio = NULL; | |
53b381b3 | 2007 | struct btrfs_mapping_tree *map_tree = &fs_info->mapping_tree; |
4a54c8c1 JS |
2008 | int ret; |
2009 | ||
908960c6 | 2010 | ASSERT(!(fs_info->sb->s_flags & MS_RDONLY)); |
4a54c8c1 JS |
2011 | BUG_ON(!mirror_num); |
2012 | ||
53b381b3 DW |
2013 | /* we can't repair anything in raid56 yet */ |
2014 | if (btrfs_is_parity_mirror(map_tree, logical, length, mirror_num)) | |
2015 | return 0; | |
2016 | ||
9be3395b | 2017 | bio = btrfs_io_bio_alloc(GFP_NOFS, 1); |
4a54c8c1 JS |
2018 | if (!bio) |
2019 | return -EIO; | |
4f024f37 | 2020 | bio->bi_iter.bi_size = 0; |
4a54c8c1 JS |
2021 | map_length = length; |
2022 | ||
3ec706c8 | 2023 | ret = btrfs_map_block(fs_info, WRITE, logical, |
4a54c8c1 JS |
2024 | &map_length, &bbio, mirror_num); |
2025 | if (ret) { | |
2026 | bio_put(bio); | |
2027 | return -EIO; | |
2028 | } | |
2029 | BUG_ON(mirror_num != bbio->mirror_num); | |
2030 | sector = bbio->stripes[mirror_num-1].physical >> 9; | |
4f024f37 | 2031 | bio->bi_iter.bi_sector = sector; |
4a54c8c1 JS |
2032 | dev = bbio->stripes[mirror_num-1].dev; |
2033 | kfree(bbio); | |
2034 | if (!dev || !dev->bdev || !dev->writeable) { | |
2035 | bio_put(bio); | |
2036 | return -EIO; | |
2037 | } | |
2038 | bio->bi_bdev = dev->bdev; | |
ffdd2018 | 2039 | bio_add_page(bio, page, length, pg_offset); |
4a54c8c1 | 2040 | |
33879d45 | 2041 | if (btrfsic_submit_bio_wait(WRITE_SYNC, bio)) { |
4a54c8c1 JS |
2042 | /* try to remap that extent elsewhere? */ |
2043 | bio_put(bio); | |
442a4f63 | 2044 | btrfs_dev_stat_inc_and_print(dev, BTRFS_DEV_STAT_WRITE_ERRS); |
4a54c8c1 JS |
2045 | return -EIO; |
2046 | } | |
2047 | ||
efe120a0 FH |
2048 | printk_ratelimited_in_rcu(KERN_INFO |
2049 | "BTRFS: read error corrected: ino %lu off %llu " | |
2050 | "(dev %s sector %llu)\n", page->mapping->host->i_ino, | |
2051 | start, rcu_str_deref(dev->name), sector); | |
4a54c8c1 JS |
2052 | |
2053 | bio_put(bio); | |
2054 | return 0; | |
2055 | } | |
2056 | ||
ea466794 JB |
2057 | int repair_eb_io_failure(struct btrfs_root *root, struct extent_buffer *eb, |
2058 | int mirror_num) | |
2059 | { | |
ea466794 JB |
2060 | u64 start = eb->start; |
2061 | unsigned long i, num_pages = num_extent_pages(eb->start, eb->len); | |
d95603b2 | 2062 | int ret = 0; |
ea466794 | 2063 | |
908960c6 ID |
2064 | if (root->fs_info->sb->s_flags & MS_RDONLY) |
2065 | return -EROFS; | |
2066 | ||
ea466794 JB |
2067 | for (i = 0; i < num_pages; i++) { |
2068 | struct page *p = extent_buffer_page(eb, i); | |
3ec706c8 | 2069 | ret = repair_io_failure(root->fs_info, start, PAGE_CACHE_SIZE, |
ffdd2018 MX |
2070 | start, p, start - page_offset(p), |
2071 | mirror_num); | |
ea466794 JB |
2072 | if (ret) |
2073 | break; | |
2074 | start += PAGE_CACHE_SIZE; | |
2075 | } | |
2076 | ||
2077 | return ret; | |
2078 | } | |
2079 | ||
4a54c8c1 JS |
2080 | /* |
2081 | * each time an IO finishes, we do a fast check in the IO failure tree | |
2082 | * to see if we need to process or clean up an io_failure_record | |
2083 | */ | |
2084 | static int clean_io_failure(u64 start, struct page *page) | |
2085 | { | |
2086 | u64 private; | |
2087 | u64 private_failure; | |
2088 | struct io_failure_record *failrec; | |
908960c6 ID |
2089 | struct inode *inode = page->mapping->host; |
2090 | struct btrfs_fs_info *fs_info = BTRFS_I(inode)->root->fs_info; | |
4a54c8c1 JS |
2091 | struct extent_state *state; |
2092 | int num_copies; | |
4a54c8c1 | 2093 | int ret; |
4a54c8c1 JS |
2094 | |
2095 | private = 0; | |
2096 | ret = count_range_bits(&BTRFS_I(inode)->io_failure_tree, &private, | |
2097 | (u64)-1, 1, EXTENT_DIRTY, 0); | |
2098 | if (!ret) | |
2099 | return 0; | |
2100 | ||
2101 | ret = get_state_private(&BTRFS_I(inode)->io_failure_tree, start, | |
2102 | &private_failure); | |
2103 | if (ret) | |
2104 | return 0; | |
2105 | ||
2106 | failrec = (struct io_failure_record *)(unsigned long) private_failure; | |
2107 | BUG_ON(!failrec->this_mirror); | |
2108 | ||
2109 | if (failrec->in_validation) { | |
2110 | /* there was no real error, just free the record */ | |
2111 | pr_debug("clean_io_failure: freeing dummy error at %llu\n", | |
2112 | failrec->start); | |
4a54c8c1 JS |
2113 | goto out; |
2114 | } | |
908960c6 ID |
2115 | if (fs_info->sb->s_flags & MS_RDONLY) |
2116 | goto out; | |
4a54c8c1 JS |
2117 | |
2118 | spin_lock(&BTRFS_I(inode)->io_tree.lock); | |
2119 | state = find_first_extent_bit_state(&BTRFS_I(inode)->io_tree, | |
2120 | failrec->start, | |
2121 | EXTENT_LOCKED); | |
2122 | spin_unlock(&BTRFS_I(inode)->io_tree.lock); | |
2123 | ||
883d0de4 MX |
2124 | if (state && state->start <= failrec->start && |
2125 | state->end >= failrec->start + failrec->len - 1) { | |
3ec706c8 SB |
2126 | num_copies = btrfs_num_copies(fs_info, failrec->logical, |
2127 | failrec->len); | |
4a54c8c1 | 2128 | if (num_copies > 1) { |
454ff3de MX |
2129 | repair_io_failure(fs_info, start, failrec->len, |
2130 | failrec->logical, page, | |
ffdd2018 | 2131 | start - page_offset(page), |
454ff3de | 2132 | failrec->failed_mirror); |
4a54c8c1 JS |
2133 | } |
2134 | } | |
2135 | ||
2136 | out: | |
454ff3de | 2137 | free_io_failure(inode, failrec); |
4a54c8c1 | 2138 | |
454ff3de | 2139 | return 0; |
4a54c8c1 JS |
2140 | } |
2141 | ||
2fe6303e MX |
2142 | int btrfs_get_io_failure_record(struct inode *inode, u64 start, u64 end, |
2143 | struct io_failure_record **failrec_ret) | |
4a54c8c1 | 2144 | { |
2fe6303e | 2145 | struct io_failure_record *failrec; |
4a54c8c1 JS |
2146 | u64 private; |
2147 | struct extent_map *em; | |
4a54c8c1 JS |
2148 | struct extent_io_tree *failure_tree = &BTRFS_I(inode)->io_failure_tree; |
2149 | struct extent_io_tree *tree = &BTRFS_I(inode)->io_tree; | |
2150 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; | |
4a54c8c1 | 2151 | int ret; |
4a54c8c1 JS |
2152 | u64 logical; |
2153 | ||
4a54c8c1 JS |
2154 | ret = get_state_private(failure_tree, start, &private); |
2155 | if (ret) { | |
2156 | failrec = kzalloc(sizeof(*failrec), GFP_NOFS); | |
2157 | if (!failrec) | |
2158 | return -ENOMEM; | |
2fe6303e | 2159 | |
4a54c8c1 JS |
2160 | failrec->start = start; |
2161 | failrec->len = end - start + 1; | |
2162 | failrec->this_mirror = 0; | |
2163 | failrec->bio_flags = 0; | |
2164 | failrec->in_validation = 0; | |
2165 | ||
2166 | read_lock(&em_tree->lock); | |
2167 | em = lookup_extent_mapping(em_tree, start, failrec->len); | |
2168 | if (!em) { | |
2169 | read_unlock(&em_tree->lock); | |
2170 | kfree(failrec); | |
2171 | return -EIO; | |
2172 | } | |
2173 | ||
68ba990f | 2174 | if (em->start > start || em->start + em->len <= start) { |
4a54c8c1 JS |
2175 | free_extent_map(em); |
2176 | em = NULL; | |
2177 | } | |
2178 | read_unlock(&em_tree->lock); | |
7a2d6a64 | 2179 | if (!em) { |
4a54c8c1 JS |
2180 | kfree(failrec); |
2181 | return -EIO; | |
2182 | } | |
2fe6303e | 2183 | |
4a54c8c1 JS |
2184 | logical = start - em->start; |
2185 | logical = em->block_start + logical; | |
2186 | if (test_bit(EXTENT_FLAG_COMPRESSED, &em->flags)) { | |
2187 | logical = em->block_start; | |
2188 | failrec->bio_flags = EXTENT_BIO_COMPRESSED; | |
2189 | extent_set_compress_type(&failrec->bio_flags, | |
2190 | em->compress_type); | |
2191 | } | |
2fe6303e MX |
2192 | |
2193 | pr_debug("Get IO Failure Record: (new) logical=%llu, start=%llu, len=%llu\n", | |
2194 | logical, start, failrec->len); | |
2195 | ||
4a54c8c1 JS |
2196 | failrec->logical = logical; |
2197 | free_extent_map(em); | |
2198 | ||
2199 | /* set the bits in the private failure tree */ | |
2200 | ret = set_extent_bits(failure_tree, start, end, | |
2201 | EXTENT_LOCKED | EXTENT_DIRTY, GFP_NOFS); | |
2202 | if (ret >= 0) | |
2203 | ret = set_state_private(failure_tree, start, | |
2204 | (u64)(unsigned long)failrec); | |
2205 | /* set the bits in the inode's tree */ | |
2206 | if (ret >= 0) | |
2207 | ret = set_extent_bits(tree, start, end, EXTENT_DAMAGED, | |
2208 | GFP_NOFS); | |
2209 | if (ret < 0) { | |
2210 | kfree(failrec); | |
2211 | return ret; | |
2212 | } | |
2213 | } else { | |
2214 | failrec = (struct io_failure_record *)(unsigned long)private; | |
2fe6303e | 2215 | pr_debug("Get IO Failure Record: (found) logical=%llu, start=%llu, len=%llu, validation=%d\n", |
4a54c8c1 JS |
2216 | failrec->logical, failrec->start, failrec->len, |
2217 | failrec->in_validation); | |
2218 | /* | |
2219 | * when data can be on disk more than twice, add to failrec here | |
2220 | * (e.g. with a list for failed_mirror) to make | |
2221 | * clean_io_failure() clean all those errors at once. | |
2222 | */ | |
2223 | } | |
2fe6303e MX |
2224 | |
2225 | *failrec_ret = failrec; | |
2226 | ||
2227 | return 0; | |
2228 | } | |
2229 | ||
2230 | int btrfs_check_repairable(struct inode *inode, struct bio *failed_bio, | |
2231 | struct io_failure_record *failrec, int failed_mirror) | |
2232 | { | |
2233 | int num_copies; | |
2234 | ||
5d964051 SB |
2235 | num_copies = btrfs_num_copies(BTRFS_I(inode)->root->fs_info, |
2236 | failrec->logical, failrec->len); | |
4a54c8c1 JS |
2237 | if (num_copies == 1) { |
2238 | /* | |
2239 | * we only have a single copy of the data, so don't bother with | |
2240 | * all the retry and error correction code that follows. no | |
2241 | * matter what the error is, it is very likely to persist. | |
2242 | */ | |
2fe6303e | 2243 | pr_debug("Check Repairable: cannot repair, num_copies=%d, next_mirror %d, failed_mirror %d\n", |
09a7f7a2 | 2244 | num_copies, failrec->this_mirror, failed_mirror); |
2fe6303e | 2245 | return 0; |
4a54c8c1 JS |
2246 | } |
2247 | ||
4a54c8c1 JS |
2248 | /* |
2249 | * there are two premises: | |
2250 | * a) deliver good data to the caller | |
2251 | * b) correct the bad sectors on disk | |
2252 | */ | |
2253 | if (failed_bio->bi_vcnt > 1) { | |
2254 | /* | |
2255 | * to fulfill b), we need to know the exact failing sectors, as | |
2256 | * we don't want to rewrite any more than the failed ones. thus, | |
2257 | * we need separate read requests for the failed bio | |
2258 | * | |
2259 | * if the following BUG_ON triggers, our validation request got | |
2260 | * merged. we need separate requests for our algorithm to work. | |
2261 | */ | |
2262 | BUG_ON(failrec->in_validation); | |
2263 | failrec->in_validation = 1; | |
2264 | failrec->this_mirror = failed_mirror; | |
4a54c8c1 JS |
2265 | } else { |
2266 | /* | |
2267 | * we're ready to fulfill a) and b) alongside. get a good copy | |
2268 | * of the failed sector and if we succeed, we have setup | |
2269 | * everything for repair_io_failure to do the rest for us. | |
2270 | */ | |
2271 | if (failrec->in_validation) { | |
2272 | BUG_ON(failrec->this_mirror != failed_mirror); | |
2273 | failrec->in_validation = 0; | |
2274 | failrec->this_mirror = 0; | |
2275 | } | |
2276 | failrec->failed_mirror = failed_mirror; | |
2277 | failrec->this_mirror++; | |
2278 | if (failrec->this_mirror == failed_mirror) | |
2279 | failrec->this_mirror++; | |
4a54c8c1 JS |
2280 | } |
2281 | ||
facc8a22 | 2282 | if (failrec->this_mirror > num_copies) { |
2fe6303e | 2283 | pr_debug("Check Repairable: (fail) num_copies=%d, next_mirror %d, failed_mirror %d\n", |
4a54c8c1 | 2284 | num_copies, failrec->this_mirror, failed_mirror); |
2fe6303e | 2285 | return 0; |
4a54c8c1 JS |
2286 | } |
2287 | ||
2fe6303e MX |
2288 | return 1; |
2289 | } | |
2290 | ||
2291 | ||
2292 | struct bio *btrfs_create_repair_bio(struct inode *inode, struct bio *failed_bio, | |
2293 | struct io_failure_record *failrec, | |
2294 | struct page *page, int pg_offset, int icsum, | |
2295 | bio_end_io_t *endio_func) | |
2296 | { | |
2297 | struct bio *bio; | |
2298 | struct btrfs_io_bio *btrfs_failed_bio; | |
2299 | struct btrfs_io_bio *btrfs_bio; | |
2300 | ||
9be3395b | 2301 | bio = btrfs_io_bio_alloc(GFP_NOFS, 1); |
2fe6303e MX |
2302 | if (!bio) |
2303 | return NULL; | |
2304 | ||
2305 | bio->bi_end_io = endio_func; | |
4f024f37 | 2306 | bio->bi_iter.bi_sector = failrec->logical >> 9; |
4a54c8c1 | 2307 | bio->bi_bdev = BTRFS_I(inode)->root->fs_info->fs_devices->latest_bdev; |
4f024f37 | 2308 | bio->bi_iter.bi_size = 0; |
4a54c8c1 | 2309 | |
facc8a22 MX |
2310 | btrfs_failed_bio = btrfs_io_bio(failed_bio); |
2311 | if (btrfs_failed_bio->csum) { | |
2312 | struct btrfs_fs_info *fs_info = BTRFS_I(inode)->root->fs_info; | |
2313 | u16 csum_size = btrfs_super_csum_size(fs_info->super_copy); | |
2314 | ||
2315 | btrfs_bio = btrfs_io_bio(bio); | |
2316 | btrfs_bio->csum = btrfs_bio->csum_inline; | |
2fe6303e MX |
2317 | icsum *= csum_size; |
2318 | memcpy(btrfs_bio->csum, btrfs_failed_bio->csum + icsum, | |
facc8a22 MX |
2319 | csum_size); |
2320 | } | |
2321 | ||
2fe6303e MX |
2322 | bio_add_page(bio, page, failrec->len, pg_offset); |
2323 | ||
2324 | return bio; | |
2325 | } | |
2326 | ||
2327 | /* | |
2328 | * this is a generic handler for readpage errors (default | |
2329 | * readpage_io_failed_hook). if other copies exist, read those and write back | |
2330 | * good data to the failed position. does not investigate in remapping the | |
2331 | * failed extent elsewhere, hoping the device will be smart enough to do this as | |
2332 | * needed | |
2333 | */ | |
2334 | ||
2335 | static int bio_readpage_error(struct bio *failed_bio, u64 phy_offset, | |
2336 | struct page *page, u64 start, u64 end, | |
2337 | int failed_mirror) | |
2338 | { | |
2339 | struct io_failure_record *failrec; | |
2340 | struct inode *inode = page->mapping->host; | |
2341 | struct extent_io_tree *tree = &BTRFS_I(inode)->io_tree; | |
2342 | struct bio *bio; | |
2343 | int read_mode; | |
2344 | int ret; | |
2345 | ||
2346 | BUG_ON(failed_bio->bi_rw & REQ_WRITE); | |
2347 | ||
2348 | ret = btrfs_get_io_failure_record(inode, start, end, &failrec); | |
2349 | if (ret) | |
2350 | return ret; | |
2351 | ||
2352 | ret = btrfs_check_repairable(inode, failed_bio, failrec, failed_mirror); | |
2353 | if (!ret) { | |
2354 | free_io_failure(inode, failrec); | |
2355 | return -EIO; | |
2356 | } | |
2357 | ||
2358 | if (failed_bio->bi_vcnt > 1) | |
2359 | read_mode = READ_SYNC | REQ_FAILFAST_DEV; | |
2360 | else | |
2361 | read_mode = READ_SYNC; | |
2362 | ||
2363 | phy_offset >>= inode->i_sb->s_blocksize_bits; | |
2364 | bio = btrfs_create_repair_bio(inode, failed_bio, failrec, page, | |
2365 | start - page_offset(page), | |
2366 | (int)phy_offset, failed_bio->bi_end_io); | |
2367 | if (!bio) { | |
2368 | free_io_failure(inode, failrec); | |
2369 | return -EIO; | |
2370 | } | |
4a54c8c1 | 2371 | |
2fe6303e MX |
2372 | pr_debug("Repair Read Error: submitting new read[%#x] to this_mirror=%d, in_validation=%d\n", |
2373 | read_mode, failrec->this_mirror, failrec->in_validation); | |
4a54c8c1 | 2374 | |
013bd4c3 TI |
2375 | ret = tree->ops->submit_bio_hook(inode, read_mode, bio, |
2376 | failrec->this_mirror, | |
2377 | failrec->bio_flags, 0); | |
6c387ab2 | 2378 | if (ret) { |
454ff3de | 2379 | free_io_failure(inode, failrec); |
6c387ab2 MX |
2380 | bio_put(bio); |
2381 | } | |
2382 | ||
013bd4c3 | 2383 | return ret; |
4a54c8c1 JS |
2384 | } |
2385 | ||
d1310b2e CM |
2386 | /* lots and lots of room for performance fixes in the end_bio funcs */ |
2387 | ||
87826df0 JM |
2388 | int end_extent_writepage(struct page *page, int err, u64 start, u64 end) |
2389 | { | |
2390 | int uptodate = (err == 0); | |
2391 | struct extent_io_tree *tree; | |
3e2426bd | 2392 | int ret = 0; |
87826df0 JM |
2393 | |
2394 | tree = &BTRFS_I(page->mapping->host)->io_tree; | |
2395 | ||
2396 | if (tree->ops && tree->ops->writepage_end_io_hook) { | |
2397 | ret = tree->ops->writepage_end_io_hook(page, start, | |
2398 | end, NULL, uptodate); | |
2399 | if (ret) | |
2400 | uptodate = 0; | |
2401 | } | |
2402 | ||
87826df0 | 2403 | if (!uptodate) { |
87826df0 JM |
2404 | ClearPageUptodate(page); |
2405 | SetPageError(page); | |
5dca6eea LB |
2406 | ret = ret < 0 ? ret : -EIO; |
2407 | mapping_set_error(page->mapping, ret); | |
87826df0 JM |
2408 | } |
2409 | return 0; | |
2410 | } | |
2411 | ||
d1310b2e CM |
2412 | /* |
2413 | * after a writepage IO is done, we need to: | |
2414 | * clear the uptodate bits on error | |
2415 | * clear the writeback bits in the extent tree for this IO | |
2416 | * end_page_writeback if the page has no more pending IO | |
2417 | * | |
2418 | * Scheduling is not allowed, so the extent state tree is expected | |
2419 | * to have one and only one object corresponding to this IO. | |
2420 | */ | |
d1310b2e | 2421 | static void end_bio_extent_writepage(struct bio *bio, int err) |
d1310b2e | 2422 | { |
2c30c71b | 2423 | struct bio_vec *bvec; |
d1310b2e CM |
2424 | u64 start; |
2425 | u64 end; | |
2c30c71b | 2426 | int i; |
d1310b2e | 2427 | |
2c30c71b | 2428 | bio_for_each_segment_all(bvec, bio, i) { |
d1310b2e | 2429 | struct page *page = bvec->bv_page; |
902b22f3 | 2430 | |
17a5adcc AO |
2431 | /* We always issue full-page reads, but if some block |
2432 | * in a page fails to read, blk_update_request() will | |
2433 | * advance bv_offset and adjust bv_len to compensate. | |
2434 | * Print a warning for nonzero offsets, and an error | |
2435 | * if they don't add up to a full page. */ | |
efe120a0 FH |
2436 | if (bvec->bv_offset || bvec->bv_len != PAGE_CACHE_SIZE) { |
2437 | if (bvec->bv_offset + bvec->bv_len != PAGE_CACHE_SIZE) | |
2438 | btrfs_err(BTRFS_I(page->mapping->host)->root->fs_info, | |
2439 | "partial page write in btrfs with offset %u and length %u", | |
2440 | bvec->bv_offset, bvec->bv_len); | |
2441 | else | |
2442 | btrfs_info(BTRFS_I(page->mapping->host)->root->fs_info, | |
2443 | "incomplete page write in btrfs with offset %u and " | |
2444 | "length %u", | |
2445 | bvec->bv_offset, bvec->bv_len); | |
2446 | } | |
d1310b2e | 2447 | |
17a5adcc AO |
2448 | start = page_offset(page); |
2449 | end = start + bvec->bv_offset + bvec->bv_len - 1; | |
d1310b2e | 2450 | |
87826df0 JM |
2451 | if (end_extent_writepage(page, err, start, end)) |
2452 | continue; | |
70dec807 | 2453 | |
17a5adcc | 2454 | end_page_writeback(page); |
2c30c71b | 2455 | } |
2b1f55b0 | 2456 | |
d1310b2e | 2457 | bio_put(bio); |
d1310b2e CM |
2458 | } |
2459 | ||
883d0de4 MX |
2460 | static void |
2461 | endio_readpage_release_extent(struct extent_io_tree *tree, u64 start, u64 len, | |
2462 | int uptodate) | |
2463 | { | |
2464 | struct extent_state *cached = NULL; | |
2465 | u64 end = start + len - 1; | |
2466 | ||
2467 | if (uptodate && tree->track_uptodate) | |
2468 | set_extent_uptodate(tree, start, end, &cached, GFP_ATOMIC); | |
2469 | unlock_extent_cached(tree, start, end, &cached, GFP_ATOMIC); | |
2470 | } | |
2471 | ||
d1310b2e CM |
2472 | /* |
2473 | * after a readpage IO is done, we need to: | |
2474 | * clear the uptodate bits on error | |
2475 | * set the uptodate bits if things worked | |
2476 | * set the page up to date if all extents in the tree are uptodate | |
2477 | * clear the lock bit in the extent tree | |
2478 | * unlock the page if there are no other extents locked for it | |
2479 | * | |
2480 | * Scheduling is not allowed, so the extent state tree is expected | |
2481 | * to have one and only one object corresponding to this IO. | |
2482 | */ | |
d1310b2e | 2483 | static void end_bio_extent_readpage(struct bio *bio, int err) |
d1310b2e | 2484 | { |
2c30c71b | 2485 | struct bio_vec *bvec; |
d1310b2e | 2486 | int uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags); |
facc8a22 | 2487 | struct btrfs_io_bio *io_bio = btrfs_io_bio(bio); |
902b22f3 | 2488 | struct extent_io_tree *tree; |
facc8a22 | 2489 | u64 offset = 0; |
d1310b2e CM |
2490 | u64 start; |
2491 | u64 end; | |
facc8a22 | 2492 | u64 len; |
883d0de4 MX |
2493 | u64 extent_start = 0; |
2494 | u64 extent_len = 0; | |
5cf1ab56 | 2495 | int mirror; |
d1310b2e | 2496 | int ret; |
2c30c71b | 2497 | int i; |
d1310b2e | 2498 | |
d20f7043 CM |
2499 | if (err) |
2500 | uptodate = 0; | |
2501 | ||
2c30c71b | 2502 | bio_for_each_segment_all(bvec, bio, i) { |
d1310b2e | 2503 | struct page *page = bvec->bv_page; |
a71754fc | 2504 | struct inode *inode = page->mapping->host; |
507903b8 | 2505 | |
be3940c0 | 2506 | pr_debug("end_bio_extent_readpage: bi_sector=%llu, err=%d, " |
c1dc0896 | 2507 | "mirror=%u\n", (u64)bio->bi_iter.bi_sector, err, |
9be3395b | 2508 | io_bio->mirror_num); |
a71754fc | 2509 | tree = &BTRFS_I(inode)->io_tree; |
902b22f3 | 2510 | |
17a5adcc AO |
2511 | /* We always issue full-page reads, but if some block |
2512 | * in a page fails to read, blk_update_request() will | |
2513 | * advance bv_offset and adjust bv_len to compensate. | |
2514 | * Print a warning for nonzero offsets, and an error | |
2515 | * if they don't add up to a full page. */ | |
efe120a0 FH |
2516 | if (bvec->bv_offset || bvec->bv_len != PAGE_CACHE_SIZE) { |
2517 | if (bvec->bv_offset + bvec->bv_len != PAGE_CACHE_SIZE) | |
2518 | btrfs_err(BTRFS_I(page->mapping->host)->root->fs_info, | |
2519 | "partial page read in btrfs with offset %u and length %u", | |
2520 | bvec->bv_offset, bvec->bv_len); | |
2521 | else | |
2522 | btrfs_info(BTRFS_I(page->mapping->host)->root->fs_info, | |
2523 | "incomplete page read in btrfs with offset %u and " | |
2524 | "length %u", | |
2525 | bvec->bv_offset, bvec->bv_len); | |
2526 | } | |
d1310b2e | 2527 | |
17a5adcc AO |
2528 | start = page_offset(page); |
2529 | end = start + bvec->bv_offset + bvec->bv_len - 1; | |
facc8a22 | 2530 | len = bvec->bv_len; |
d1310b2e | 2531 | |
9be3395b | 2532 | mirror = io_bio->mirror_num; |
f2a09da9 MX |
2533 | if (likely(uptodate && tree->ops && |
2534 | tree->ops->readpage_end_io_hook)) { | |
facc8a22 MX |
2535 | ret = tree->ops->readpage_end_io_hook(io_bio, offset, |
2536 | page, start, end, | |
2537 | mirror); | |
5ee0844d | 2538 | if (ret) |
d1310b2e | 2539 | uptodate = 0; |
5ee0844d | 2540 | else |
4a54c8c1 | 2541 | clean_io_failure(start, page); |
d1310b2e | 2542 | } |
ea466794 | 2543 | |
f2a09da9 MX |
2544 | if (likely(uptodate)) |
2545 | goto readpage_ok; | |
2546 | ||
2547 | if (tree->ops && tree->ops->readpage_io_failed_hook) { | |
5cf1ab56 | 2548 | ret = tree->ops->readpage_io_failed_hook(page, mirror); |
ea466794 JB |
2549 | if (!ret && !err && |
2550 | test_bit(BIO_UPTODATE, &bio->bi_flags)) | |
2551 | uptodate = 1; | |
f2a09da9 | 2552 | } else { |
f4a8e656 JS |
2553 | /* |
2554 | * The generic bio_readpage_error handles errors the | |
2555 | * following way: If possible, new read requests are | |
2556 | * created and submitted and will end up in | |
2557 | * end_bio_extent_readpage as well (if we're lucky, not | |
2558 | * in the !uptodate case). In that case it returns 0 and | |
2559 | * we just go on with the next page in our bio. If it | |
2560 | * can't handle the error it will return -EIO and we | |
2561 | * remain responsible for that page. | |
2562 | */ | |
facc8a22 MX |
2563 | ret = bio_readpage_error(bio, offset, page, start, end, |
2564 | mirror); | |
7e38326f | 2565 | if (ret == 0) { |
3b951516 CM |
2566 | uptodate = |
2567 | test_bit(BIO_UPTODATE, &bio->bi_flags); | |
d20f7043 CM |
2568 | if (err) |
2569 | uptodate = 0; | |
38c1c2e4 | 2570 | offset += len; |
7e38326f CM |
2571 | continue; |
2572 | } | |
2573 | } | |
f2a09da9 | 2574 | readpage_ok: |
883d0de4 | 2575 | if (likely(uptodate)) { |
a71754fc JB |
2576 | loff_t i_size = i_size_read(inode); |
2577 | pgoff_t end_index = i_size >> PAGE_CACHE_SHIFT; | |
a583c026 | 2578 | unsigned off; |
a71754fc JB |
2579 | |
2580 | /* Zero out the end if this page straddles i_size */ | |
a583c026 LB |
2581 | off = i_size & (PAGE_CACHE_SIZE-1); |
2582 | if (page->index == end_index && off) | |
2583 | zero_user_segment(page, off, PAGE_CACHE_SIZE); | |
17a5adcc | 2584 | SetPageUptodate(page); |
70dec807 | 2585 | } else { |
17a5adcc AO |
2586 | ClearPageUptodate(page); |
2587 | SetPageError(page); | |
70dec807 | 2588 | } |
17a5adcc | 2589 | unlock_page(page); |
facc8a22 | 2590 | offset += len; |
883d0de4 MX |
2591 | |
2592 | if (unlikely(!uptodate)) { | |
2593 | if (extent_len) { | |
2594 | endio_readpage_release_extent(tree, | |
2595 | extent_start, | |
2596 | extent_len, 1); | |
2597 | extent_start = 0; | |
2598 | extent_len = 0; | |
2599 | } | |
2600 | endio_readpage_release_extent(tree, start, | |
2601 | end - start + 1, 0); | |
2602 | } else if (!extent_len) { | |
2603 | extent_start = start; | |
2604 | extent_len = end + 1 - start; | |
2605 | } else if (extent_start + extent_len == start) { | |
2606 | extent_len += end + 1 - start; | |
2607 | } else { | |
2608 | endio_readpage_release_extent(tree, extent_start, | |
2609 | extent_len, uptodate); | |
2610 | extent_start = start; | |
2611 | extent_len = end + 1 - start; | |
2612 | } | |
2c30c71b | 2613 | } |
d1310b2e | 2614 | |
883d0de4 MX |
2615 | if (extent_len) |
2616 | endio_readpage_release_extent(tree, extent_start, extent_len, | |
2617 | uptodate); | |
facc8a22 MX |
2618 | if (io_bio->end_io) |
2619 | io_bio->end_io(io_bio, err); | |
d1310b2e | 2620 | bio_put(bio); |
d1310b2e CM |
2621 | } |
2622 | ||
9be3395b CM |
2623 | /* |
2624 | * this allocates from the btrfs_bioset. We're returning a bio right now | |
2625 | * but you can call btrfs_io_bio for the appropriate container_of magic | |
2626 | */ | |
88f794ed MX |
2627 | struct bio * |
2628 | btrfs_bio_alloc(struct block_device *bdev, u64 first_sector, int nr_vecs, | |
2629 | gfp_t gfp_flags) | |
d1310b2e | 2630 | { |
facc8a22 | 2631 | struct btrfs_io_bio *btrfs_bio; |
d1310b2e CM |
2632 | struct bio *bio; |
2633 | ||
9be3395b | 2634 | bio = bio_alloc_bioset(gfp_flags, nr_vecs, btrfs_bioset); |
d1310b2e CM |
2635 | |
2636 | if (bio == NULL && (current->flags & PF_MEMALLOC)) { | |
9be3395b CM |
2637 | while (!bio && (nr_vecs /= 2)) { |
2638 | bio = bio_alloc_bioset(gfp_flags, | |
2639 | nr_vecs, btrfs_bioset); | |
2640 | } | |
d1310b2e CM |
2641 | } |
2642 | ||
2643 | if (bio) { | |
2644 | bio->bi_bdev = bdev; | |
4f024f37 | 2645 | bio->bi_iter.bi_sector = first_sector; |
facc8a22 MX |
2646 | btrfs_bio = btrfs_io_bio(bio); |
2647 | btrfs_bio->csum = NULL; | |
2648 | btrfs_bio->csum_allocated = NULL; | |
2649 | btrfs_bio->end_io = NULL; | |
d1310b2e CM |
2650 | } |
2651 | return bio; | |
2652 | } | |
2653 | ||
9be3395b CM |
2654 | struct bio *btrfs_bio_clone(struct bio *bio, gfp_t gfp_mask) |
2655 | { | |
23ea8e5a MX |
2656 | struct btrfs_io_bio *btrfs_bio; |
2657 | struct bio *new; | |
9be3395b | 2658 | |
23ea8e5a MX |
2659 | new = bio_clone_bioset(bio, gfp_mask, btrfs_bioset); |
2660 | if (new) { | |
2661 | btrfs_bio = btrfs_io_bio(new); | |
2662 | btrfs_bio->csum = NULL; | |
2663 | btrfs_bio->csum_allocated = NULL; | |
2664 | btrfs_bio->end_io = NULL; | |
2665 | } | |
2666 | return new; | |
2667 | } | |
9be3395b CM |
2668 | |
2669 | /* this also allocates from the btrfs_bioset */ | |
2670 | struct bio *btrfs_io_bio_alloc(gfp_t gfp_mask, unsigned int nr_iovecs) | |
2671 | { | |
facc8a22 MX |
2672 | struct btrfs_io_bio *btrfs_bio; |
2673 | struct bio *bio; | |
2674 | ||
2675 | bio = bio_alloc_bioset(gfp_mask, nr_iovecs, btrfs_bioset); | |
2676 | if (bio) { | |
2677 | btrfs_bio = btrfs_io_bio(bio); | |
2678 | btrfs_bio->csum = NULL; | |
2679 | btrfs_bio->csum_allocated = NULL; | |
2680 | btrfs_bio->end_io = NULL; | |
2681 | } | |
2682 | return bio; | |
9be3395b CM |
2683 | } |
2684 | ||
2685 | ||
355808c2 JM |
2686 | static int __must_check submit_one_bio(int rw, struct bio *bio, |
2687 | int mirror_num, unsigned long bio_flags) | |
d1310b2e | 2688 | { |
d1310b2e | 2689 | int ret = 0; |
70dec807 CM |
2690 | struct bio_vec *bvec = bio->bi_io_vec + bio->bi_vcnt - 1; |
2691 | struct page *page = bvec->bv_page; | |
2692 | struct extent_io_tree *tree = bio->bi_private; | |
70dec807 | 2693 | u64 start; |
70dec807 | 2694 | |
4eee4fa4 | 2695 | start = page_offset(page) + bvec->bv_offset; |
70dec807 | 2696 | |
902b22f3 | 2697 | bio->bi_private = NULL; |
d1310b2e CM |
2698 | |
2699 | bio_get(bio); | |
2700 | ||
065631f6 | 2701 | if (tree->ops && tree->ops->submit_bio_hook) |
6b82ce8d | 2702 | ret = tree->ops->submit_bio_hook(page->mapping->host, rw, bio, |
eaf25d93 | 2703 | mirror_num, bio_flags, start); |
0b86a832 | 2704 | else |
21adbd5c | 2705 | btrfsic_submit_bio(rw, bio); |
4a54c8c1 | 2706 | |
d1310b2e CM |
2707 | if (bio_flagged(bio, BIO_EOPNOTSUPP)) |
2708 | ret = -EOPNOTSUPP; | |
2709 | bio_put(bio); | |
2710 | return ret; | |
2711 | } | |
2712 | ||
64a16701 | 2713 | static int merge_bio(int rw, struct extent_io_tree *tree, struct page *page, |
3444a972 JM |
2714 | unsigned long offset, size_t size, struct bio *bio, |
2715 | unsigned long bio_flags) | |
2716 | { | |
2717 | int ret = 0; | |
2718 | if (tree->ops && tree->ops->merge_bio_hook) | |
64a16701 | 2719 | ret = tree->ops->merge_bio_hook(rw, page, offset, size, bio, |
3444a972 JM |
2720 | bio_flags); |
2721 | BUG_ON(ret < 0); | |
2722 | return ret; | |
2723 | ||
2724 | } | |
2725 | ||
d1310b2e CM |
2726 | static int submit_extent_page(int rw, struct extent_io_tree *tree, |
2727 | struct page *page, sector_t sector, | |
2728 | size_t size, unsigned long offset, | |
2729 | struct block_device *bdev, | |
2730 | struct bio **bio_ret, | |
2731 | unsigned long max_pages, | |
f188591e | 2732 | bio_end_io_t end_io_func, |
c8b97818 CM |
2733 | int mirror_num, |
2734 | unsigned long prev_bio_flags, | |
2735 | unsigned long bio_flags) | |
d1310b2e CM |
2736 | { |
2737 | int ret = 0; | |
2738 | struct bio *bio; | |
2739 | int nr; | |
c8b97818 CM |
2740 | int contig = 0; |
2741 | int this_compressed = bio_flags & EXTENT_BIO_COMPRESSED; | |
2742 | int old_compressed = prev_bio_flags & EXTENT_BIO_COMPRESSED; | |
5b050f04 | 2743 | size_t page_size = min_t(size_t, size, PAGE_CACHE_SIZE); |
d1310b2e CM |
2744 | |
2745 | if (bio_ret && *bio_ret) { | |
2746 | bio = *bio_ret; | |
c8b97818 | 2747 | if (old_compressed) |
4f024f37 | 2748 | contig = bio->bi_iter.bi_sector == sector; |
c8b97818 | 2749 | else |
f73a1c7d | 2750 | contig = bio_end_sector(bio) == sector; |
c8b97818 CM |
2751 | |
2752 | if (prev_bio_flags != bio_flags || !contig || | |
64a16701 | 2753 | merge_bio(rw, tree, page, offset, page_size, bio, bio_flags) || |
c8b97818 CM |
2754 | bio_add_page(bio, page, page_size, offset) < page_size) { |
2755 | ret = submit_one_bio(rw, bio, mirror_num, | |
2756 | prev_bio_flags); | |
79787eaa JM |
2757 | if (ret < 0) |
2758 | return ret; | |
d1310b2e CM |
2759 | bio = NULL; |
2760 | } else { | |
2761 | return 0; | |
2762 | } | |
2763 | } | |
c8b97818 CM |
2764 | if (this_compressed) |
2765 | nr = BIO_MAX_PAGES; | |
2766 | else | |
2767 | nr = bio_get_nr_vecs(bdev); | |
2768 | ||
88f794ed | 2769 | bio = btrfs_bio_alloc(bdev, sector, nr, GFP_NOFS | __GFP_HIGH); |
5df67083 TI |
2770 | if (!bio) |
2771 | return -ENOMEM; | |
70dec807 | 2772 | |
c8b97818 | 2773 | bio_add_page(bio, page, page_size, offset); |
d1310b2e CM |
2774 | bio->bi_end_io = end_io_func; |
2775 | bio->bi_private = tree; | |
70dec807 | 2776 | |
d397712b | 2777 | if (bio_ret) |
d1310b2e | 2778 | *bio_ret = bio; |
d397712b | 2779 | else |
c8b97818 | 2780 | ret = submit_one_bio(rw, bio, mirror_num, bio_flags); |
d1310b2e CM |
2781 | |
2782 | return ret; | |
2783 | } | |
2784 | ||
48a3b636 ES |
2785 | static void attach_extent_buffer_page(struct extent_buffer *eb, |
2786 | struct page *page) | |
d1310b2e CM |
2787 | { |
2788 | if (!PagePrivate(page)) { | |
2789 | SetPagePrivate(page); | |
d1310b2e | 2790 | page_cache_get(page); |
4f2de97a JB |
2791 | set_page_private(page, (unsigned long)eb); |
2792 | } else { | |
2793 | WARN_ON(page->private != (unsigned long)eb); | |
d1310b2e CM |
2794 | } |
2795 | } | |
2796 | ||
4f2de97a | 2797 | void set_page_extent_mapped(struct page *page) |
d1310b2e | 2798 | { |
4f2de97a JB |
2799 | if (!PagePrivate(page)) { |
2800 | SetPagePrivate(page); | |
2801 | page_cache_get(page); | |
2802 | set_page_private(page, EXTENT_PAGE_PRIVATE); | |
2803 | } | |
d1310b2e CM |
2804 | } |
2805 | ||
125bac01 MX |
2806 | static struct extent_map * |
2807 | __get_extent_map(struct inode *inode, struct page *page, size_t pg_offset, | |
2808 | u64 start, u64 len, get_extent_t *get_extent, | |
2809 | struct extent_map **em_cached) | |
2810 | { | |
2811 | struct extent_map *em; | |
2812 | ||
2813 | if (em_cached && *em_cached) { | |
2814 | em = *em_cached; | |
cbc0e928 | 2815 | if (extent_map_in_tree(em) && start >= em->start && |
125bac01 MX |
2816 | start < extent_map_end(em)) { |
2817 | atomic_inc(&em->refs); | |
2818 | return em; | |
2819 | } | |
2820 | ||
2821 | free_extent_map(em); | |
2822 | *em_cached = NULL; | |
2823 | } | |
2824 | ||
2825 | em = get_extent(inode, page, pg_offset, start, len, 0); | |
2826 | if (em_cached && !IS_ERR_OR_NULL(em)) { | |
2827 | BUG_ON(*em_cached); | |
2828 | atomic_inc(&em->refs); | |
2829 | *em_cached = em; | |
2830 | } | |
2831 | return em; | |
2832 | } | |
d1310b2e CM |
2833 | /* |
2834 | * basic readpage implementation. Locked extent state structs are inserted | |
2835 | * into the tree that are removed when the IO is done (by the end_io | |
2836 | * handlers) | |
79787eaa | 2837 | * XXX JDM: This needs looking at to ensure proper page locking |
d1310b2e | 2838 | */ |
9974090b MX |
2839 | static int __do_readpage(struct extent_io_tree *tree, |
2840 | struct page *page, | |
2841 | get_extent_t *get_extent, | |
125bac01 | 2842 | struct extent_map **em_cached, |
9974090b MX |
2843 | struct bio **bio, int mirror_num, |
2844 | unsigned long *bio_flags, int rw) | |
d1310b2e CM |
2845 | { |
2846 | struct inode *inode = page->mapping->host; | |
4eee4fa4 | 2847 | u64 start = page_offset(page); |
d1310b2e CM |
2848 | u64 page_end = start + PAGE_CACHE_SIZE - 1; |
2849 | u64 end; | |
2850 | u64 cur = start; | |
2851 | u64 extent_offset; | |
2852 | u64 last_byte = i_size_read(inode); | |
2853 | u64 block_start; | |
2854 | u64 cur_end; | |
2855 | sector_t sector; | |
2856 | struct extent_map *em; | |
2857 | struct block_device *bdev; | |
2858 | int ret; | |
2859 | int nr = 0; | |
4b384318 | 2860 | int parent_locked = *bio_flags & EXTENT_BIO_PARENT_LOCKED; |
306e16ce | 2861 | size_t pg_offset = 0; |
d1310b2e | 2862 | size_t iosize; |
c8b97818 | 2863 | size_t disk_io_size; |
d1310b2e | 2864 | size_t blocksize = inode->i_sb->s_blocksize; |
4b384318 | 2865 | unsigned long this_bio_flag = *bio_flags & EXTENT_BIO_PARENT_LOCKED; |
d1310b2e CM |
2866 | |
2867 | set_page_extent_mapped(page); | |
2868 | ||
9974090b | 2869 | end = page_end; |
90a887c9 DM |
2870 | if (!PageUptodate(page)) { |
2871 | if (cleancache_get_page(page) == 0) { | |
2872 | BUG_ON(blocksize != PAGE_SIZE); | |
9974090b | 2873 | unlock_extent(tree, start, end); |
90a887c9 DM |
2874 | goto out; |
2875 | } | |
2876 | } | |
2877 | ||
c8b97818 CM |
2878 | if (page->index == last_byte >> PAGE_CACHE_SHIFT) { |
2879 | char *userpage; | |
2880 | size_t zero_offset = last_byte & (PAGE_CACHE_SIZE - 1); | |
2881 | ||
2882 | if (zero_offset) { | |
2883 | iosize = PAGE_CACHE_SIZE - zero_offset; | |
7ac687d9 | 2884 | userpage = kmap_atomic(page); |
c8b97818 CM |
2885 | memset(userpage + zero_offset, 0, iosize); |
2886 | flush_dcache_page(page); | |
7ac687d9 | 2887 | kunmap_atomic(userpage); |
c8b97818 CM |
2888 | } |
2889 | } | |
d1310b2e | 2890 | while (cur <= end) { |
c8f2f24b JB |
2891 | unsigned long pnr = (last_byte >> PAGE_CACHE_SHIFT) + 1; |
2892 | ||
d1310b2e CM |
2893 | if (cur >= last_byte) { |
2894 | char *userpage; | |
507903b8 AJ |
2895 | struct extent_state *cached = NULL; |
2896 | ||
306e16ce | 2897 | iosize = PAGE_CACHE_SIZE - pg_offset; |
7ac687d9 | 2898 | userpage = kmap_atomic(page); |
306e16ce | 2899 | memset(userpage + pg_offset, 0, iosize); |
d1310b2e | 2900 | flush_dcache_page(page); |
7ac687d9 | 2901 | kunmap_atomic(userpage); |
d1310b2e | 2902 | set_extent_uptodate(tree, cur, cur + iosize - 1, |
507903b8 | 2903 | &cached, GFP_NOFS); |
4b384318 MF |
2904 | if (!parent_locked) |
2905 | unlock_extent_cached(tree, cur, | |
2906 | cur + iosize - 1, | |
2907 | &cached, GFP_NOFS); | |
d1310b2e CM |
2908 | break; |
2909 | } | |
125bac01 MX |
2910 | em = __get_extent_map(inode, page, pg_offset, cur, |
2911 | end - cur + 1, get_extent, em_cached); | |
c704005d | 2912 | if (IS_ERR_OR_NULL(em)) { |
d1310b2e | 2913 | SetPageError(page); |
4b384318 MF |
2914 | if (!parent_locked) |
2915 | unlock_extent(tree, cur, end); | |
d1310b2e CM |
2916 | break; |
2917 | } | |
d1310b2e CM |
2918 | extent_offset = cur - em->start; |
2919 | BUG_ON(extent_map_end(em) <= cur); | |
2920 | BUG_ON(end < cur); | |
2921 | ||
261507a0 | 2922 | if (test_bit(EXTENT_FLAG_COMPRESSED, &em->flags)) { |
4b384318 | 2923 | this_bio_flag |= EXTENT_BIO_COMPRESSED; |
261507a0 LZ |
2924 | extent_set_compress_type(&this_bio_flag, |
2925 | em->compress_type); | |
2926 | } | |
c8b97818 | 2927 | |
d1310b2e CM |
2928 | iosize = min(extent_map_end(em) - cur, end - cur + 1); |
2929 | cur_end = min(extent_map_end(em) - 1, end); | |
fda2832f | 2930 | iosize = ALIGN(iosize, blocksize); |
c8b97818 CM |
2931 | if (this_bio_flag & EXTENT_BIO_COMPRESSED) { |
2932 | disk_io_size = em->block_len; | |
2933 | sector = em->block_start >> 9; | |
2934 | } else { | |
2935 | sector = (em->block_start + extent_offset) >> 9; | |
2936 | disk_io_size = iosize; | |
2937 | } | |
d1310b2e CM |
2938 | bdev = em->bdev; |
2939 | block_start = em->block_start; | |
d899e052 YZ |
2940 | if (test_bit(EXTENT_FLAG_PREALLOC, &em->flags)) |
2941 | block_start = EXTENT_MAP_HOLE; | |
d1310b2e CM |
2942 | free_extent_map(em); |
2943 | em = NULL; | |
2944 | ||
2945 | /* we've found a hole, just zero and go on */ | |
2946 | if (block_start == EXTENT_MAP_HOLE) { | |
2947 | char *userpage; | |
507903b8 AJ |
2948 | struct extent_state *cached = NULL; |
2949 | ||
7ac687d9 | 2950 | userpage = kmap_atomic(page); |
306e16ce | 2951 | memset(userpage + pg_offset, 0, iosize); |
d1310b2e | 2952 | flush_dcache_page(page); |
7ac687d9 | 2953 | kunmap_atomic(userpage); |
d1310b2e CM |
2954 | |
2955 | set_extent_uptodate(tree, cur, cur + iosize - 1, | |
507903b8 AJ |
2956 | &cached, GFP_NOFS); |
2957 | unlock_extent_cached(tree, cur, cur + iosize - 1, | |
2958 | &cached, GFP_NOFS); | |
d1310b2e | 2959 | cur = cur + iosize; |
306e16ce | 2960 | pg_offset += iosize; |
d1310b2e CM |
2961 | continue; |
2962 | } | |
2963 | /* the get_extent function already copied into the page */ | |
9655d298 CM |
2964 | if (test_range_bit(tree, cur, cur_end, |
2965 | EXTENT_UPTODATE, 1, NULL)) { | |
a1b32a59 | 2966 | check_page_uptodate(tree, page); |
4b384318 MF |
2967 | if (!parent_locked) |
2968 | unlock_extent(tree, cur, cur + iosize - 1); | |
d1310b2e | 2969 | cur = cur + iosize; |
306e16ce | 2970 | pg_offset += iosize; |
d1310b2e CM |
2971 | continue; |
2972 | } | |
70dec807 CM |
2973 | /* we have an inline extent but it didn't get marked up |
2974 | * to date. Error out | |
2975 | */ | |
2976 | if (block_start == EXTENT_MAP_INLINE) { | |
2977 | SetPageError(page); | |
4b384318 MF |
2978 | if (!parent_locked) |
2979 | unlock_extent(tree, cur, cur + iosize - 1); | |
70dec807 | 2980 | cur = cur + iosize; |
306e16ce | 2981 | pg_offset += iosize; |
70dec807 CM |
2982 | continue; |
2983 | } | |
d1310b2e | 2984 | |
c8f2f24b | 2985 | pnr -= page->index; |
d4c7ca86 | 2986 | ret = submit_extent_page(rw, tree, page, |
306e16ce | 2987 | sector, disk_io_size, pg_offset, |
89642229 | 2988 | bdev, bio, pnr, |
c8b97818 CM |
2989 | end_bio_extent_readpage, mirror_num, |
2990 | *bio_flags, | |
2991 | this_bio_flag); | |
c8f2f24b JB |
2992 | if (!ret) { |
2993 | nr++; | |
2994 | *bio_flags = this_bio_flag; | |
2995 | } else { | |
d1310b2e | 2996 | SetPageError(page); |
4b384318 MF |
2997 | if (!parent_locked) |
2998 | unlock_extent(tree, cur, cur + iosize - 1); | |
edd33c99 | 2999 | } |
d1310b2e | 3000 | cur = cur + iosize; |
306e16ce | 3001 | pg_offset += iosize; |
d1310b2e | 3002 | } |
90a887c9 | 3003 | out: |
d1310b2e CM |
3004 | if (!nr) { |
3005 | if (!PageError(page)) | |
3006 | SetPageUptodate(page); | |
3007 | unlock_page(page); | |
3008 | } | |
3009 | return 0; | |
3010 | } | |
3011 | ||
9974090b MX |
3012 | static inline void __do_contiguous_readpages(struct extent_io_tree *tree, |
3013 | struct page *pages[], int nr_pages, | |
3014 | u64 start, u64 end, | |
3015 | get_extent_t *get_extent, | |
125bac01 | 3016 | struct extent_map **em_cached, |
9974090b MX |
3017 | struct bio **bio, int mirror_num, |
3018 | unsigned long *bio_flags, int rw) | |
3019 | { | |
3020 | struct inode *inode; | |
3021 | struct btrfs_ordered_extent *ordered; | |
3022 | int index; | |
3023 | ||
3024 | inode = pages[0]->mapping->host; | |
3025 | while (1) { | |
3026 | lock_extent(tree, start, end); | |
3027 | ordered = btrfs_lookup_ordered_range(inode, start, | |
3028 | end - start + 1); | |
3029 | if (!ordered) | |
3030 | break; | |
3031 | unlock_extent(tree, start, end); | |
3032 | btrfs_start_ordered_extent(inode, ordered, 1); | |
3033 | btrfs_put_ordered_extent(ordered); | |
3034 | } | |
3035 | ||
3036 | for (index = 0; index < nr_pages; index++) { | |
125bac01 MX |
3037 | __do_readpage(tree, pages[index], get_extent, em_cached, bio, |
3038 | mirror_num, bio_flags, rw); | |
9974090b MX |
3039 | page_cache_release(pages[index]); |
3040 | } | |
3041 | } | |
3042 | ||
3043 | static void __extent_readpages(struct extent_io_tree *tree, | |
3044 | struct page *pages[], | |
3045 | int nr_pages, get_extent_t *get_extent, | |
125bac01 | 3046 | struct extent_map **em_cached, |
9974090b MX |
3047 | struct bio **bio, int mirror_num, |
3048 | unsigned long *bio_flags, int rw) | |
3049 | { | |
35a3621b | 3050 | u64 start = 0; |
9974090b MX |
3051 | u64 end = 0; |
3052 | u64 page_start; | |
3053 | int index; | |
35a3621b | 3054 | int first_index = 0; |
9974090b MX |
3055 | |
3056 | for (index = 0; index < nr_pages; index++) { | |
3057 | page_start = page_offset(pages[index]); | |
3058 | if (!end) { | |
3059 | start = page_start; | |
3060 | end = start + PAGE_CACHE_SIZE - 1; | |
3061 | first_index = index; | |
3062 | } else if (end + 1 == page_start) { | |
3063 | end += PAGE_CACHE_SIZE; | |
3064 | } else { | |
3065 | __do_contiguous_readpages(tree, &pages[first_index], | |
3066 | index - first_index, start, | |
125bac01 MX |
3067 | end, get_extent, em_cached, |
3068 | bio, mirror_num, bio_flags, | |
3069 | rw); | |
9974090b MX |
3070 | start = page_start; |
3071 | end = start + PAGE_CACHE_SIZE - 1; | |
3072 | first_index = index; | |
3073 | } | |
3074 | } | |
3075 | ||
3076 | if (end) | |
3077 | __do_contiguous_readpages(tree, &pages[first_index], | |
3078 | index - first_index, start, | |
125bac01 | 3079 | end, get_extent, em_cached, bio, |
9974090b MX |
3080 | mirror_num, bio_flags, rw); |
3081 | } | |
3082 | ||
3083 | static int __extent_read_full_page(struct extent_io_tree *tree, | |
3084 | struct page *page, | |
3085 | get_extent_t *get_extent, | |
3086 | struct bio **bio, int mirror_num, | |
3087 | unsigned long *bio_flags, int rw) | |
3088 | { | |
3089 | struct inode *inode = page->mapping->host; | |
3090 | struct btrfs_ordered_extent *ordered; | |
3091 | u64 start = page_offset(page); | |
3092 | u64 end = start + PAGE_CACHE_SIZE - 1; | |
3093 | int ret; | |
3094 | ||
3095 | while (1) { | |
3096 | lock_extent(tree, start, end); | |
3097 | ordered = btrfs_lookup_ordered_extent(inode, start); | |
3098 | if (!ordered) | |
3099 | break; | |
3100 | unlock_extent(tree, start, end); | |
3101 | btrfs_start_ordered_extent(inode, ordered, 1); | |
3102 | btrfs_put_ordered_extent(ordered); | |
3103 | } | |
3104 | ||
125bac01 MX |
3105 | ret = __do_readpage(tree, page, get_extent, NULL, bio, mirror_num, |
3106 | bio_flags, rw); | |
9974090b MX |
3107 | return ret; |
3108 | } | |
3109 | ||
d1310b2e | 3110 | int extent_read_full_page(struct extent_io_tree *tree, struct page *page, |
8ddc7d9c | 3111 | get_extent_t *get_extent, int mirror_num) |
d1310b2e CM |
3112 | { |
3113 | struct bio *bio = NULL; | |
c8b97818 | 3114 | unsigned long bio_flags = 0; |
d1310b2e CM |
3115 | int ret; |
3116 | ||
8ddc7d9c | 3117 | ret = __extent_read_full_page(tree, page, get_extent, &bio, mirror_num, |
d4c7ca86 | 3118 | &bio_flags, READ); |
d1310b2e | 3119 | if (bio) |
8ddc7d9c | 3120 | ret = submit_one_bio(READ, bio, mirror_num, bio_flags); |
d1310b2e CM |
3121 | return ret; |
3122 | } | |
d1310b2e | 3123 | |
4b384318 MF |
3124 | int extent_read_full_page_nolock(struct extent_io_tree *tree, struct page *page, |
3125 | get_extent_t *get_extent, int mirror_num) | |
3126 | { | |
3127 | struct bio *bio = NULL; | |
3128 | unsigned long bio_flags = EXTENT_BIO_PARENT_LOCKED; | |
3129 | int ret; | |
3130 | ||
3131 | ret = __do_readpage(tree, page, get_extent, NULL, &bio, mirror_num, | |
3132 | &bio_flags, READ); | |
3133 | if (bio) | |
3134 | ret = submit_one_bio(READ, bio, mirror_num, bio_flags); | |
3135 | return ret; | |
3136 | } | |
3137 | ||
11c8349b CM |
3138 | static noinline void update_nr_written(struct page *page, |
3139 | struct writeback_control *wbc, | |
3140 | unsigned long nr_written) | |
3141 | { | |
3142 | wbc->nr_to_write -= nr_written; | |
3143 | if (wbc->range_cyclic || (wbc->nr_to_write > 0 && | |
3144 | wbc->range_start == 0 && wbc->range_end == LLONG_MAX)) | |
3145 | page->mapping->writeback_index = page->index + nr_written; | |
3146 | } | |
3147 | ||
d1310b2e | 3148 | /* |
40f76580 CM |
3149 | * helper for __extent_writepage, doing all of the delayed allocation setup. |
3150 | * | |
3151 | * This returns 1 if our fill_delalloc function did all the work required | |
3152 | * to write the page (copy into inline extent). In this case the IO has | |
3153 | * been started and the page is already unlocked. | |
3154 | * | |
3155 | * This returns 0 if all went well (page still locked) | |
3156 | * This returns < 0 if there were errors (page still locked) | |
d1310b2e | 3157 | */ |
40f76580 CM |
3158 | static noinline_for_stack int writepage_delalloc(struct inode *inode, |
3159 | struct page *page, struct writeback_control *wbc, | |
3160 | struct extent_page_data *epd, | |
3161 | u64 delalloc_start, | |
3162 | unsigned long *nr_written) | |
3163 | { | |
3164 | struct extent_io_tree *tree = epd->tree; | |
3165 | u64 page_end = delalloc_start + PAGE_CACHE_SIZE - 1; | |
3166 | u64 nr_delalloc; | |
3167 | u64 delalloc_to_write = 0; | |
3168 | u64 delalloc_end = 0; | |
3169 | int ret; | |
3170 | int page_started = 0; | |
3171 | ||
3172 | if (epd->extent_locked || !tree->ops || !tree->ops->fill_delalloc) | |
3173 | return 0; | |
3174 | ||
3175 | while (delalloc_end < page_end) { | |
3176 | nr_delalloc = find_lock_delalloc_range(inode, tree, | |
3177 | page, | |
3178 | &delalloc_start, | |
3179 | &delalloc_end, | |
3180 | 128 * 1024 * 1024); | |
3181 | if (nr_delalloc == 0) { | |
3182 | delalloc_start = delalloc_end + 1; | |
3183 | continue; | |
3184 | } | |
3185 | ret = tree->ops->fill_delalloc(inode, page, | |
3186 | delalloc_start, | |
3187 | delalloc_end, | |
3188 | &page_started, | |
3189 | nr_written); | |
3190 | /* File system has been set read-only */ | |
3191 | if (ret) { | |
3192 | SetPageError(page); | |
3193 | /* fill_delalloc should be return < 0 for error | |
3194 | * but just in case, we use > 0 here meaning the | |
3195 | * IO is started, so we don't want to return > 0 | |
3196 | * unless things are going well. | |
3197 | */ | |
3198 | ret = ret < 0 ? ret : -EIO; | |
3199 | goto done; | |
3200 | } | |
3201 | /* | |
3202 | * delalloc_end is already one less than the total | |
3203 | * length, so we don't subtract one from | |
3204 | * PAGE_CACHE_SIZE | |
3205 | */ | |
3206 | delalloc_to_write += (delalloc_end - delalloc_start + | |
3207 | PAGE_CACHE_SIZE) >> | |
3208 | PAGE_CACHE_SHIFT; | |
3209 | delalloc_start = delalloc_end + 1; | |
3210 | } | |
3211 | if (wbc->nr_to_write < delalloc_to_write) { | |
3212 | int thresh = 8192; | |
3213 | ||
3214 | if (delalloc_to_write < thresh * 2) | |
3215 | thresh = delalloc_to_write; | |
3216 | wbc->nr_to_write = min_t(u64, delalloc_to_write, | |
3217 | thresh); | |
3218 | } | |
3219 | ||
3220 | /* did the fill delalloc function already unlock and start | |
3221 | * the IO? | |
3222 | */ | |
3223 | if (page_started) { | |
3224 | /* | |
3225 | * we've unlocked the page, so we can't update | |
3226 | * the mapping's writeback index, just update | |
3227 | * nr_to_write. | |
3228 | */ | |
3229 | wbc->nr_to_write -= *nr_written; | |
3230 | return 1; | |
3231 | } | |
3232 | ||
3233 | ret = 0; | |
3234 | ||
3235 | done: | |
3236 | return ret; | |
3237 | } | |
3238 | ||
3239 | /* | |
3240 | * helper for __extent_writepage. This calls the writepage start hooks, | |
3241 | * and does the loop to map the page into extents and bios. | |
3242 | * | |
3243 | * We return 1 if the IO is started and the page is unlocked, | |
3244 | * 0 if all went well (page still locked) | |
3245 | * < 0 if there were errors (page still locked) | |
3246 | */ | |
3247 | static noinline_for_stack int __extent_writepage_io(struct inode *inode, | |
3248 | struct page *page, | |
3249 | struct writeback_control *wbc, | |
3250 | struct extent_page_data *epd, | |
3251 | loff_t i_size, | |
3252 | unsigned long nr_written, | |
3253 | int write_flags, int *nr_ret) | |
d1310b2e | 3254 | { |
d1310b2e | 3255 | struct extent_io_tree *tree = epd->tree; |
4eee4fa4 | 3256 | u64 start = page_offset(page); |
d1310b2e CM |
3257 | u64 page_end = start + PAGE_CACHE_SIZE - 1; |
3258 | u64 end; | |
3259 | u64 cur = start; | |
3260 | u64 extent_offset; | |
d1310b2e CM |
3261 | u64 block_start; |
3262 | u64 iosize; | |
3263 | sector_t sector; | |
2c64c53d | 3264 | struct extent_state *cached_state = NULL; |
d1310b2e CM |
3265 | struct extent_map *em; |
3266 | struct block_device *bdev; | |
7f3c74fb | 3267 | size_t pg_offset = 0; |
d1310b2e | 3268 | size_t blocksize; |
40f76580 CM |
3269 | int ret = 0; |
3270 | int nr = 0; | |
3271 | bool compressed; | |
c8b97818 | 3272 | |
247e743c | 3273 | if (tree->ops && tree->ops->writepage_start_hook) { |
c8b97818 CM |
3274 | ret = tree->ops->writepage_start_hook(page, start, |
3275 | page_end); | |
87826df0 JM |
3276 | if (ret) { |
3277 | /* Fixup worker will requeue */ | |
3278 | if (ret == -EBUSY) | |
3279 | wbc->pages_skipped++; | |
3280 | else | |
3281 | redirty_page_for_writepage(wbc, page); | |
40f76580 | 3282 | |
11c8349b | 3283 | update_nr_written(page, wbc, nr_written); |
247e743c | 3284 | unlock_page(page); |
40f76580 | 3285 | ret = 1; |
11c8349b | 3286 | goto done_unlocked; |
247e743c CM |
3287 | } |
3288 | } | |
3289 | ||
11c8349b CM |
3290 | /* |
3291 | * we don't want to touch the inode after unlocking the page, | |
3292 | * so we update the mapping writeback index now | |
3293 | */ | |
3294 | update_nr_written(page, wbc, nr_written + 1); | |
771ed689 | 3295 | |
d1310b2e | 3296 | end = page_end; |
40f76580 | 3297 | if (i_size <= start) { |
e6dcd2dc CM |
3298 | if (tree->ops && tree->ops->writepage_end_io_hook) |
3299 | tree->ops->writepage_end_io_hook(page, start, | |
3300 | page_end, NULL, 1); | |
d1310b2e CM |
3301 | goto done; |
3302 | } | |
3303 | ||
d1310b2e CM |
3304 | blocksize = inode->i_sb->s_blocksize; |
3305 | ||
3306 | while (cur <= end) { | |
40f76580 CM |
3307 | u64 em_end; |
3308 | if (cur >= i_size) { | |
e6dcd2dc CM |
3309 | if (tree->ops && tree->ops->writepage_end_io_hook) |
3310 | tree->ops->writepage_end_io_hook(page, cur, | |
3311 | page_end, NULL, 1); | |
d1310b2e CM |
3312 | break; |
3313 | } | |
7f3c74fb | 3314 | em = epd->get_extent(inode, page, pg_offset, cur, |
d1310b2e | 3315 | end - cur + 1, 1); |
c704005d | 3316 | if (IS_ERR_OR_NULL(em)) { |
d1310b2e | 3317 | SetPageError(page); |
61391d56 | 3318 | ret = PTR_ERR_OR_ZERO(em); |
d1310b2e CM |
3319 | break; |
3320 | } | |
3321 | ||
3322 | extent_offset = cur - em->start; | |
40f76580 CM |
3323 | em_end = extent_map_end(em); |
3324 | BUG_ON(em_end <= cur); | |
d1310b2e | 3325 | BUG_ON(end < cur); |
40f76580 | 3326 | iosize = min(em_end - cur, end - cur + 1); |
fda2832f | 3327 | iosize = ALIGN(iosize, blocksize); |
d1310b2e CM |
3328 | sector = (em->block_start + extent_offset) >> 9; |
3329 | bdev = em->bdev; | |
3330 | block_start = em->block_start; | |
c8b97818 | 3331 | compressed = test_bit(EXTENT_FLAG_COMPRESSED, &em->flags); |
d1310b2e CM |
3332 | free_extent_map(em); |
3333 | em = NULL; | |
3334 | ||
c8b97818 CM |
3335 | /* |
3336 | * compressed and inline extents are written through other | |
3337 | * paths in the FS | |
3338 | */ | |
3339 | if (compressed || block_start == EXTENT_MAP_HOLE || | |
d1310b2e | 3340 | block_start == EXTENT_MAP_INLINE) { |
c8b97818 CM |
3341 | /* |
3342 | * end_io notification does not happen here for | |
3343 | * compressed extents | |
3344 | */ | |
3345 | if (!compressed && tree->ops && | |
3346 | tree->ops->writepage_end_io_hook) | |
e6dcd2dc CM |
3347 | tree->ops->writepage_end_io_hook(page, cur, |
3348 | cur + iosize - 1, | |
3349 | NULL, 1); | |
c8b97818 CM |
3350 | else if (compressed) { |
3351 | /* we don't want to end_page_writeback on | |
3352 | * a compressed extent. this happens | |
3353 | * elsewhere | |
3354 | */ | |
3355 | nr++; | |
3356 | } | |
3357 | ||
3358 | cur += iosize; | |
7f3c74fb | 3359 | pg_offset += iosize; |
d1310b2e CM |
3360 | continue; |
3361 | } | |
c8b97818 | 3362 | |
d1310b2e CM |
3363 | if (tree->ops && tree->ops->writepage_io_hook) { |
3364 | ret = tree->ops->writepage_io_hook(page, cur, | |
3365 | cur + iosize - 1); | |
3366 | } else { | |
3367 | ret = 0; | |
3368 | } | |
1259ab75 | 3369 | if (ret) { |
d1310b2e | 3370 | SetPageError(page); |
1259ab75 | 3371 | } else { |
40f76580 | 3372 | unsigned long max_nr = (i_size >> PAGE_CACHE_SHIFT) + 1; |
7f3c74fb | 3373 | |
d1310b2e CM |
3374 | set_range_writeback(tree, cur, cur + iosize - 1); |
3375 | if (!PageWriteback(page)) { | |
efe120a0 FH |
3376 | btrfs_err(BTRFS_I(inode)->root->fs_info, |
3377 | "page %lu not writeback, cur %llu end %llu", | |
c1c9ff7c | 3378 | page->index, cur, end); |
d1310b2e CM |
3379 | } |
3380 | ||
ffbd517d CM |
3381 | ret = submit_extent_page(write_flags, tree, page, |
3382 | sector, iosize, pg_offset, | |
3383 | bdev, &epd->bio, max_nr, | |
c8b97818 CM |
3384 | end_bio_extent_writepage, |
3385 | 0, 0, 0); | |
d1310b2e CM |
3386 | if (ret) |
3387 | SetPageError(page); | |
3388 | } | |
3389 | cur = cur + iosize; | |
7f3c74fb | 3390 | pg_offset += iosize; |
d1310b2e CM |
3391 | nr++; |
3392 | } | |
40f76580 CM |
3393 | done: |
3394 | *nr_ret = nr; | |
3395 | ||
3396 | done_unlocked: | |
3397 | ||
3398 | /* drop our reference on any cached states */ | |
3399 | free_extent_state(cached_state); | |
3400 | return ret; | |
3401 | } | |
3402 | ||
3403 | /* | |
3404 | * the writepage semantics are similar to regular writepage. extent | |
3405 | * records are inserted to lock ranges in the tree, and as dirty areas | |
3406 | * are found, they are marked writeback. Then the lock bits are removed | |
3407 | * and the end_io handler clears the writeback ranges | |
3408 | */ | |
3409 | static int __extent_writepage(struct page *page, struct writeback_control *wbc, | |
3410 | void *data) | |
3411 | { | |
3412 | struct inode *inode = page->mapping->host; | |
3413 | struct extent_page_data *epd = data; | |
3414 | u64 start = page_offset(page); | |
3415 | u64 page_end = start + PAGE_CACHE_SIZE - 1; | |
3416 | int ret; | |
3417 | int nr = 0; | |
3418 | size_t pg_offset = 0; | |
3419 | loff_t i_size = i_size_read(inode); | |
3420 | unsigned long end_index = i_size >> PAGE_CACHE_SHIFT; | |
3421 | int write_flags; | |
3422 | unsigned long nr_written = 0; | |
3423 | ||
3424 | if (wbc->sync_mode == WB_SYNC_ALL) | |
3425 | write_flags = WRITE_SYNC; | |
3426 | else | |
3427 | write_flags = WRITE; | |
3428 | ||
3429 | trace___extent_writepage(page, inode, wbc); | |
3430 | ||
3431 | WARN_ON(!PageLocked(page)); | |
3432 | ||
3433 | ClearPageError(page); | |
3434 | ||
3435 | pg_offset = i_size & (PAGE_CACHE_SIZE - 1); | |
3436 | if (page->index > end_index || | |
3437 | (page->index == end_index && !pg_offset)) { | |
3438 | page->mapping->a_ops->invalidatepage(page, 0, PAGE_CACHE_SIZE); | |
3439 | unlock_page(page); | |
3440 | return 0; | |
3441 | } | |
3442 | ||
3443 | if (page->index == end_index) { | |
3444 | char *userpage; | |
3445 | ||
3446 | userpage = kmap_atomic(page); | |
3447 | memset(userpage + pg_offset, 0, | |
3448 | PAGE_CACHE_SIZE - pg_offset); | |
3449 | kunmap_atomic(userpage); | |
3450 | flush_dcache_page(page); | |
3451 | } | |
3452 | ||
3453 | pg_offset = 0; | |
3454 | ||
3455 | set_page_extent_mapped(page); | |
3456 | ||
3457 | ret = writepage_delalloc(inode, page, wbc, epd, start, &nr_written); | |
3458 | if (ret == 1) | |
3459 | goto done_unlocked; | |
3460 | if (ret) | |
3461 | goto done; | |
3462 | ||
3463 | ret = __extent_writepage_io(inode, page, wbc, epd, | |
3464 | i_size, nr_written, write_flags, &nr); | |
3465 | if (ret == 1) | |
3466 | goto done_unlocked; | |
3467 | ||
d1310b2e CM |
3468 | done: |
3469 | if (nr == 0) { | |
3470 | /* make sure the mapping tag for page dirty gets cleared */ | |
3471 | set_page_writeback(page); | |
3472 | end_page_writeback(page); | |
3473 | } | |
61391d56 FM |
3474 | if (PageError(page)) { |
3475 | ret = ret < 0 ? ret : -EIO; | |
3476 | end_extent_writepage(page, ret, start, page_end); | |
3477 | } | |
d1310b2e | 3478 | unlock_page(page); |
40f76580 | 3479 | return ret; |
771ed689 | 3480 | |
11c8349b | 3481 | done_unlocked: |
d1310b2e CM |
3482 | return 0; |
3483 | } | |
3484 | ||
fd8b2b61 | 3485 | void wait_on_extent_buffer_writeback(struct extent_buffer *eb) |
0b32f4bb | 3486 | { |
74316201 N |
3487 | wait_on_bit_io(&eb->bflags, EXTENT_BUFFER_WRITEBACK, |
3488 | TASK_UNINTERRUPTIBLE); | |
0b32f4bb JB |
3489 | } |
3490 | ||
0e378df1 CM |
3491 | static noinline_for_stack int |
3492 | lock_extent_buffer_for_io(struct extent_buffer *eb, | |
3493 | struct btrfs_fs_info *fs_info, | |
3494 | struct extent_page_data *epd) | |
0b32f4bb JB |
3495 | { |
3496 | unsigned long i, num_pages; | |
3497 | int flush = 0; | |
3498 | int ret = 0; | |
3499 | ||
3500 | if (!btrfs_try_tree_write_lock(eb)) { | |
3501 | flush = 1; | |
3502 | flush_write_bio(epd); | |
3503 | btrfs_tree_lock(eb); | |
3504 | } | |
3505 | ||
3506 | if (test_bit(EXTENT_BUFFER_WRITEBACK, &eb->bflags)) { | |
3507 | btrfs_tree_unlock(eb); | |
3508 | if (!epd->sync_io) | |
3509 | return 0; | |
3510 | if (!flush) { | |
3511 | flush_write_bio(epd); | |
3512 | flush = 1; | |
3513 | } | |
a098d8e8 CM |
3514 | while (1) { |
3515 | wait_on_extent_buffer_writeback(eb); | |
3516 | btrfs_tree_lock(eb); | |
3517 | if (!test_bit(EXTENT_BUFFER_WRITEBACK, &eb->bflags)) | |
3518 | break; | |
0b32f4bb | 3519 | btrfs_tree_unlock(eb); |
0b32f4bb JB |
3520 | } |
3521 | } | |
3522 | ||
51561ffe JB |
3523 | /* |
3524 | * We need to do this to prevent races in people who check if the eb is | |
3525 | * under IO since we can end up having no IO bits set for a short period | |
3526 | * of time. | |
3527 | */ | |
3528 | spin_lock(&eb->refs_lock); | |
0b32f4bb JB |
3529 | if (test_and_clear_bit(EXTENT_BUFFER_DIRTY, &eb->bflags)) { |
3530 | set_bit(EXTENT_BUFFER_WRITEBACK, &eb->bflags); | |
51561ffe | 3531 | spin_unlock(&eb->refs_lock); |
0b32f4bb | 3532 | btrfs_set_header_flag(eb, BTRFS_HEADER_FLAG_WRITTEN); |
e2d84521 MX |
3533 | __percpu_counter_add(&fs_info->dirty_metadata_bytes, |
3534 | -eb->len, | |
3535 | fs_info->dirty_metadata_batch); | |
0b32f4bb | 3536 | ret = 1; |
51561ffe JB |
3537 | } else { |
3538 | spin_unlock(&eb->refs_lock); | |
0b32f4bb JB |
3539 | } |
3540 | ||
3541 | btrfs_tree_unlock(eb); | |
3542 | ||
3543 | if (!ret) | |
3544 | return ret; | |
3545 | ||
3546 | num_pages = num_extent_pages(eb->start, eb->len); | |
3547 | for (i = 0; i < num_pages; i++) { | |
3548 | struct page *p = extent_buffer_page(eb, i); | |
3549 | ||
3550 | if (!trylock_page(p)) { | |
3551 | if (!flush) { | |
3552 | flush_write_bio(epd); | |
3553 | flush = 1; | |
3554 | } | |
3555 | lock_page(p); | |
3556 | } | |
3557 | } | |
3558 | ||
3559 | return ret; | |
3560 | } | |
3561 | ||
3562 | static void end_extent_buffer_writeback(struct extent_buffer *eb) | |
3563 | { | |
3564 | clear_bit(EXTENT_BUFFER_WRITEBACK, &eb->bflags); | |
4e857c58 | 3565 | smp_mb__after_atomic(); |
0b32f4bb JB |
3566 | wake_up_bit(&eb->bflags, EXTENT_BUFFER_WRITEBACK); |
3567 | } | |
3568 | ||
3569 | static void end_bio_extent_buffer_writepage(struct bio *bio, int err) | |
3570 | { | |
2c30c71b | 3571 | struct bio_vec *bvec; |
0b32f4bb | 3572 | struct extent_buffer *eb; |
2c30c71b | 3573 | int i, done; |
0b32f4bb | 3574 | |
2c30c71b | 3575 | bio_for_each_segment_all(bvec, bio, i) { |
0b32f4bb JB |
3576 | struct page *page = bvec->bv_page; |
3577 | ||
0b32f4bb JB |
3578 | eb = (struct extent_buffer *)page->private; |
3579 | BUG_ON(!eb); | |
3580 | done = atomic_dec_and_test(&eb->io_pages); | |
3581 | ||
2c30c71b | 3582 | if (err || test_bit(EXTENT_BUFFER_IOERR, &eb->bflags)) { |
0b32f4bb JB |
3583 | set_bit(EXTENT_BUFFER_IOERR, &eb->bflags); |
3584 | ClearPageUptodate(page); | |
3585 | SetPageError(page); | |
3586 | } | |
3587 | ||
3588 | end_page_writeback(page); | |
3589 | ||
3590 | if (!done) | |
3591 | continue; | |
3592 | ||
3593 | end_extent_buffer_writeback(eb); | |
2c30c71b | 3594 | } |
0b32f4bb JB |
3595 | |
3596 | bio_put(bio); | |
0b32f4bb JB |
3597 | } |
3598 | ||
0e378df1 | 3599 | static noinline_for_stack int write_one_eb(struct extent_buffer *eb, |
0b32f4bb JB |
3600 | struct btrfs_fs_info *fs_info, |
3601 | struct writeback_control *wbc, | |
3602 | struct extent_page_data *epd) | |
3603 | { | |
3604 | struct block_device *bdev = fs_info->fs_devices->latest_bdev; | |
f28491e0 | 3605 | struct extent_io_tree *tree = &BTRFS_I(fs_info->btree_inode)->io_tree; |
0b32f4bb JB |
3606 | u64 offset = eb->start; |
3607 | unsigned long i, num_pages; | |
de0022b9 | 3608 | unsigned long bio_flags = 0; |
d4c7ca86 | 3609 | int rw = (epd->sync_io ? WRITE_SYNC : WRITE) | REQ_META; |
d7dbe9e7 | 3610 | int ret = 0; |
0b32f4bb JB |
3611 | |
3612 | clear_bit(EXTENT_BUFFER_IOERR, &eb->bflags); | |
3613 | num_pages = num_extent_pages(eb->start, eb->len); | |
3614 | atomic_set(&eb->io_pages, num_pages); | |
de0022b9 JB |
3615 | if (btrfs_header_owner(eb) == BTRFS_TREE_LOG_OBJECTID) |
3616 | bio_flags = EXTENT_BIO_TREE_LOG; | |
3617 | ||
0b32f4bb JB |
3618 | for (i = 0; i < num_pages; i++) { |
3619 | struct page *p = extent_buffer_page(eb, i); | |
3620 | ||
3621 | clear_page_dirty_for_io(p); | |
3622 | set_page_writeback(p); | |
f28491e0 | 3623 | ret = submit_extent_page(rw, tree, p, offset >> 9, |
0b32f4bb JB |
3624 | PAGE_CACHE_SIZE, 0, bdev, &epd->bio, |
3625 | -1, end_bio_extent_buffer_writepage, | |
de0022b9 JB |
3626 | 0, epd->bio_flags, bio_flags); |
3627 | epd->bio_flags = bio_flags; | |
0b32f4bb JB |
3628 | if (ret) { |
3629 | set_bit(EXTENT_BUFFER_IOERR, &eb->bflags); | |
3630 | SetPageError(p); | |
3631 | if (atomic_sub_and_test(num_pages - i, &eb->io_pages)) | |
3632 | end_extent_buffer_writeback(eb); | |
3633 | ret = -EIO; | |
3634 | break; | |
3635 | } | |
3636 | offset += PAGE_CACHE_SIZE; | |
3637 | update_nr_written(p, wbc, 1); | |
3638 | unlock_page(p); | |
3639 | } | |
3640 | ||
3641 | if (unlikely(ret)) { | |
3642 | for (; i < num_pages; i++) { | |
3643 | struct page *p = extent_buffer_page(eb, i); | |
3644 | unlock_page(p); | |
3645 | } | |
3646 | } | |
3647 | ||
3648 | return ret; | |
3649 | } | |
3650 | ||
3651 | int btree_write_cache_pages(struct address_space *mapping, | |
3652 | struct writeback_control *wbc) | |
3653 | { | |
3654 | struct extent_io_tree *tree = &BTRFS_I(mapping->host)->io_tree; | |
3655 | struct btrfs_fs_info *fs_info = BTRFS_I(mapping->host)->root->fs_info; | |
3656 | struct extent_buffer *eb, *prev_eb = NULL; | |
3657 | struct extent_page_data epd = { | |
3658 | .bio = NULL, | |
3659 | .tree = tree, | |
3660 | .extent_locked = 0, | |
3661 | .sync_io = wbc->sync_mode == WB_SYNC_ALL, | |
de0022b9 | 3662 | .bio_flags = 0, |
0b32f4bb JB |
3663 | }; |
3664 | int ret = 0; | |
3665 | int done = 0; | |
3666 | int nr_to_write_done = 0; | |
3667 | struct pagevec pvec; | |
3668 | int nr_pages; | |
3669 | pgoff_t index; | |
3670 | pgoff_t end; /* Inclusive */ | |
3671 | int scanned = 0; | |
3672 | int tag; | |
3673 | ||
3674 | pagevec_init(&pvec, 0); | |
3675 | if (wbc->range_cyclic) { | |
3676 | index = mapping->writeback_index; /* Start from prev offset */ | |
3677 | end = -1; | |
3678 | } else { | |
3679 | index = wbc->range_start >> PAGE_CACHE_SHIFT; | |
3680 | end = wbc->range_end >> PAGE_CACHE_SHIFT; | |
3681 | scanned = 1; | |
3682 | } | |
3683 | if (wbc->sync_mode == WB_SYNC_ALL) | |
3684 | tag = PAGECACHE_TAG_TOWRITE; | |
3685 | else | |
3686 | tag = PAGECACHE_TAG_DIRTY; | |
3687 | retry: | |
3688 | if (wbc->sync_mode == WB_SYNC_ALL) | |
3689 | tag_pages_for_writeback(mapping, index, end); | |
3690 | while (!done && !nr_to_write_done && (index <= end) && | |
3691 | (nr_pages = pagevec_lookup_tag(&pvec, mapping, &index, tag, | |
3692 | min(end - index, (pgoff_t)PAGEVEC_SIZE-1) + 1))) { | |
3693 | unsigned i; | |
3694 | ||
3695 | scanned = 1; | |
3696 | for (i = 0; i < nr_pages; i++) { | |
3697 | struct page *page = pvec.pages[i]; | |
3698 | ||
3699 | if (!PagePrivate(page)) | |
3700 | continue; | |
3701 | ||
3702 | if (!wbc->range_cyclic && page->index > end) { | |
3703 | done = 1; | |
3704 | break; | |
3705 | } | |
3706 | ||
b5bae261 JB |
3707 | spin_lock(&mapping->private_lock); |
3708 | if (!PagePrivate(page)) { | |
3709 | spin_unlock(&mapping->private_lock); | |
3710 | continue; | |
3711 | } | |
3712 | ||
0b32f4bb | 3713 | eb = (struct extent_buffer *)page->private; |
b5bae261 JB |
3714 | |
3715 | /* | |
3716 | * Shouldn't happen and normally this would be a BUG_ON | |
3717 | * but no sense in crashing the users box for something | |
3718 | * we can survive anyway. | |
3719 | */ | |
fae7f21c | 3720 | if (WARN_ON(!eb)) { |
b5bae261 | 3721 | spin_unlock(&mapping->private_lock); |
0b32f4bb JB |
3722 | continue; |
3723 | } | |
3724 | ||
b5bae261 JB |
3725 | if (eb == prev_eb) { |
3726 | spin_unlock(&mapping->private_lock); | |
0b32f4bb | 3727 | continue; |
b5bae261 | 3728 | } |
0b32f4bb | 3729 | |
b5bae261 JB |
3730 | ret = atomic_inc_not_zero(&eb->refs); |
3731 | spin_unlock(&mapping->private_lock); | |
3732 | if (!ret) | |
0b32f4bb | 3733 | continue; |
0b32f4bb JB |
3734 | |
3735 | prev_eb = eb; | |
3736 | ret = lock_extent_buffer_for_io(eb, fs_info, &epd); | |
3737 | if (!ret) { | |
3738 | free_extent_buffer(eb); | |
3739 | continue; | |
3740 | } | |
3741 | ||
3742 | ret = write_one_eb(eb, fs_info, wbc, &epd); | |
3743 | if (ret) { | |
3744 | done = 1; | |
3745 | free_extent_buffer(eb); | |
3746 | break; | |
3747 | } | |
3748 | free_extent_buffer(eb); | |
3749 | ||
3750 | /* | |
3751 | * the filesystem may choose to bump up nr_to_write. | |
3752 | * We have to make sure to honor the new nr_to_write | |
3753 | * at any time | |
3754 | */ | |
3755 | nr_to_write_done = wbc->nr_to_write <= 0; | |
3756 | } | |
3757 | pagevec_release(&pvec); | |
3758 | cond_resched(); | |
3759 | } | |
3760 | if (!scanned && !done) { | |
3761 | /* | |
3762 | * We hit the last page and there is more work to be done: wrap | |
3763 | * back to the start of the file | |
3764 | */ | |
3765 | scanned = 1; | |
3766 | index = 0; | |
3767 | goto retry; | |
3768 | } | |
3769 | flush_write_bio(&epd); | |
3770 | return ret; | |
3771 | } | |
3772 | ||
d1310b2e | 3773 | /** |
4bef0848 | 3774 | * write_cache_pages - walk the list of dirty pages of the given address space and write all of them. |
d1310b2e CM |
3775 | * @mapping: address space structure to write |
3776 | * @wbc: subtract the number of written pages from *@wbc->nr_to_write | |
3777 | * @writepage: function called for each page | |
3778 | * @data: data passed to writepage function | |
3779 | * | |
3780 | * If a page is already under I/O, write_cache_pages() skips it, even | |
3781 | * if it's dirty. This is desirable behaviour for memory-cleaning writeback, | |
3782 | * but it is INCORRECT for data-integrity system calls such as fsync(). fsync() | |
3783 | * and msync() need to guarantee that all the data which was dirty at the time | |
3784 | * the call was made get new I/O started against them. If wbc->sync_mode is | |
3785 | * WB_SYNC_ALL then we were called for data integrity and we must wait for | |
3786 | * existing IO to complete. | |
3787 | */ | |
b2950863 | 3788 | static int extent_write_cache_pages(struct extent_io_tree *tree, |
4bef0848 CM |
3789 | struct address_space *mapping, |
3790 | struct writeback_control *wbc, | |
d2c3f4f6 CM |
3791 | writepage_t writepage, void *data, |
3792 | void (*flush_fn)(void *)) | |
d1310b2e | 3793 | { |
7fd1a3f7 | 3794 | struct inode *inode = mapping->host; |
d1310b2e CM |
3795 | int ret = 0; |
3796 | int done = 0; | |
61391d56 | 3797 | int err = 0; |
f85d7d6c | 3798 | int nr_to_write_done = 0; |
d1310b2e CM |
3799 | struct pagevec pvec; |
3800 | int nr_pages; | |
3801 | pgoff_t index; | |
3802 | pgoff_t end; /* Inclusive */ | |
3803 | int scanned = 0; | |
f7aaa06b | 3804 | int tag; |
d1310b2e | 3805 | |
7fd1a3f7 JB |
3806 | /* |
3807 | * We have to hold onto the inode so that ordered extents can do their | |
3808 | * work when the IO finishes. The alternative to this is failing to add | |
3809 | * an ordered extent if the igrab() fails there and that is a huge pain | |
3810 | * to deal with, so instead just hold onto the inode throughout the | |
3811 | * writepages operation. If it fails here we are freeing up the inode | |
3812 | * anyway and we'd rather not waste our time writing out stuff that is | |
3813 | * going to be truncated anyway. | |
3814 | */ | |
3815 | if (!igrab(inode)) | |
3816 | return 0; | |
3817 | ||
d1310b2e CM |
3818 | pagevec_init(&pvec, 0); |
3819 | if (wbc->range_cyclic) { | |
3820 | index = mapping->writeback_index; /* Start from prev offset */ | |
3821 | end = -1; | |
3822 | } else { | |
3823 | index = wbc->range_start >> PAGE_CACHE_SHIFT; | |
3824 | end = wbc->range_end >> PAGE_CACHE_SHIFT; | |
d1310b2e CM |
3825 | scanned = 1; |
3826 | } | |
f7aaa06b JB |
3827 | if (wbc->sync_mode == WB_SYNC_ALL) |
3828 | tag = PAGECACHE_TAG_TOWRITE; | |
3829 | else | |
3830 | tag = PAGECACHE_TAG_DIRTY; | |
d1310b2e | 3831 | retry: |
f7aaa06b JB |
3832 | if (wbc->sync_mode == WB_SYNC_ALL) |
3833 | tag_pages_for_writeback(mapping, index, end); | |
f85d7d6c | 3834 | while (!done && !nr_to_write_done && (index <= end) && |
f7aaa06b JB |
3835 | (nr_pages = pagevec_lookup_tag(&pvec, mapping, &index, tag, |
3836 | min(end - index, (pgoff_t)PAGEVEC_SIZE-1) + 1))) { | |
d1310b2e CM |
3837 | unsigned i; |
3838 | ||
3839 | scanned = 1; | |
3840 | for (i = 0; i < nr_pages; i++) { | |
3841 | struct page *page = pvec.pages[i]; | |
3842 | ||
3843 | /* | |
3844 | * At this point we hold neither mapping->tree_lock nor | |
3845 | * lock on the page itself: the page may be truncated or | |
3846 | * invalidated (changing page->mapping to NULL), or even | |
3847 | * swizzled back from swapper_space to tmpfs file | |
3848 | * mapping | |
3849 | */ | |
c8f2f24b JB |
3850 | if (!trylock_page(page)) { |
3851 | flush_fn(data); | |
3852 | lock_page(page); | |
01d658f2 | 3853 | } |
d1310b2e CM |
3854 | |
3855 | if (unlikely(page->mapping != mapping)) { | |
3856 | unlock_page(page); | |
3857 | continue; | |
3858 | } | |
3859 | ||
3860 | if (!wbc->range_cyclic && page->index > end) { | |
3861 | done = 1; | |
3862 | unlock_page(page); | |
3863 | continue; | |
3864 | } | |
3865 | ||
d2c3f4f6 | 3866 | if (wbc->sync_mode != WB_SYNC_NONE) { |
0e6bd956 CM |
3867 | if (PageWriteback(page)) |
3868 | flush_fn(data); | |
d1310b2e | 3869 | wait_on_page_writeback(page); |
d2c3f4f6 | 3870 | } |
d1310b2e CM |
3871 | |
3872 | if (PageWriteback(page) || | |
3873 | !clear_page_dirty_for_io(page)) { | |
3874 | unlock_page(page); | |
3875 | continue; | |
3876 | } | |
3877 | ||
3878 | ret = (*writepage)(page, wbc, data); | |
3879 | ||
3880 | if (unlikely(ret == AOP_WRITEPAGE_ACTIVATE)) { | |
3881 | unlock_page(page); | |
3882 | ret = 0; | |
3883 | } | |
61391d56 FM |
3884 | if (!err && ret < 0) |
3885 | err = ret; | |
f85d7d6c CM |
3886 | |
3887 | /* | |
3888 | * the filesystem may choose to bump up nr_to_write. | |
3889 | * We have to make sure to honor the new nr_to_write | |
3890 | * at any time | |
3891 | */ | |
3892 | nr_to_write_done = wbc->nr_to_write <= 0; | |
d1310b2e CM |
3893 | } |
3894 | pagevec_release(&pvec); | |
3895 | cond_resched(); | |
3896 | } | |
61391d56 | 3897 | if (!scanned && !done && !err) { |
d1310b2e CM |
3898 | /* |
3899 | * We hit the last page and there is more work to be done: wrap | |
3900 | * back to the start of the file | |
3901 | */ | |
3902 | scanned = 1; | |
3903 | index = 0; | |
3904 | goto retry; | |
3905 | } | |
7fd1a3f7 | 3906 | btrfs_add_delayed_iput(inode); |
61391d56 | 3907 | return err; |
d1310b2e | 3908 | } |
d1310b2e | 3909 | |
ffbd517d | 3910 | static void flush_epd_write_bio(struct extent_page_data *epd) |
d2c3f4f6 | 3911 | { |
d2c3f4f6 | 3912 | if (epd->bio) { |
355808c2 JM |
3913 | int rw = WRITE; |
3914 | int ret; | |
3915 | ||
ffbd517d | 3916 | if (epd->sync_io) |
355808c2 JM |
3917 | rw = WRITE_SYNC; |
3918 | ||
de0022b9 | 3919 | ret = submit_one_bio(rw, epd->bio, 0, epd->bio_flags); |
79787eaa | 3920 | BUG_ON(ret < 0); /* -ENOMEM */ |
d2c3f4f6 CM |
3921 | epd->bio = NULL; |
3922 | } | |
3923 | } | |
3924 | ||
ffbd517d CM |
3925 | static noinline void flush_write_bio(void *data) |
3926 | { | |
3927 | struct extent_page_data *epd = data; | |
3928 | flush_epd_write_bio(epd); | |
3929 | } | |
3930 | ||
d1310b2e CM |
3931 | int extent_write_full_page(struct extent_io_tree *tree, struct page *page, |
3932 | get_extent_t *get_extent, | |
3933 | struct writeback_control *wbc) | |
3934 | { | |
3935 | int ret; | |
d1310b2e CM |
3936 | struct extent_page_data epd = { |
3937 | .bio = NULL, | |
3938 | .tree = tree, | |
3939 | .get_extent = get_extent, | |
771ed689 | 3940 | .extent_locked = 0, |
ffbd517d | 3941 | .sync_io = wbc->sync_mode == WB_SYNC_ALL, |
de0022b9 | 3942 | .bio_flags = 0, |
d1310b2e | 3943 | }; |
d1310b2e | 3944 | |
d1310b2e CM |
3945 | ret = __extent_writepage(page, wbc, &epd); |
3946 | ||
ffbd517d | 3947 | flush_epd_write_bio(&epd); |
d1310b2e CM |
3948 | return ret; |
3949 | } | |
d1310b2e | 3950 | |
771ed689 CM |
3951 | int extent_write_locked_range(struct extent_io_tree *tree, struct inode *inode, |
3952 | u64 start, u64 end, get_extent_t *get_extent, | |
3953 | int mode) | |
3954 | { | |
3955 | int ret = 0; | |
3956 | struct address_space *mapping = inode->i_mapping; | |
3957 | struct page *page; | |
3958 | unsigned long nr_pages = (end - start + PAGE_CACHE_SIZE) >> | |
3959 | PAGE_CACHE_SHIFT; | |
3960 | ||
3961 | struct extent_page_data epd = { | |
3962 | .bio = NULL, | |
3963 | .tree = tree, | |
3964 | .get_extent = get_extent, | |
3965 | .extent_locked = 1, | |
ffbd517d | 3966 | .sync_io = mode == WB_SYNC_ALL, |
de0022b9 | 3967 | .bio_flags = 0, |
771ed689 CM |
3968 | }; |
3969 | struct writeback_control wbc_writepages = { | |
771ed689 | 3970 | .sync_mode = mode, |
771ed689 CM |
3971 | .nr_to_write = nr_pages * 2, |
3972 | .range_start = start, | |
3973 | .range_end = end + 1, | |
3974 | }; | |
3975 | ||
d397712b | 3976 | while (start <= end) { |
771ed689 CM |
3977 | page = find_get_page(mapping, start >> PAGE_CACHE_SHIFT); |
3978 | if (clear_page_dirty_for_io(page)) | |
3979 | ret = __extent_writepage(page, &wbc_writepages, &epd); | |
3980 | else { | |
3981 | if (tree->ops && tree->ops->writepage_end_io_hook) | |
3982 | tree->ops->writepage_end_io_hook(page, start, | |
3983 | start + PAGE_CACHE_SIZE - 1, | |
3984 | NULL, 1); | |
3985 | unlock_page(page); | |
3986 | } | |
3987 | page_cache_release(page); | |
3988 | start += PAGE_CACHE_SIZE; | |
3989 | } | |
3990 | ||
ffbd517d | 3991 | flush_epd_write_bio(&epd); |
771ed689 CM |
3992 | return ret; |
3993 | } | |
d1310b2e CM |
3994 | |
3995 | int extent_writepages(struct extent_io_tree *tree, | |
3996 | struct address_space *mapping, | |
3997 | get_extent_t *get_extent, | |
3998 | struct writeback_control *wbc) | |
3999 | { | |
4000 | int ret = 0; | |
4001 | struct extent_page_data epd = { | |
4002 | .bio = NULL, | |
4003 | .tree = tree, | |
4004 | .get_extent = get_extent, | |
771ed689 | 4005 | .extent_locked = 0, |
ffbd517d | 4006 | .sync_io = wbc->sync_mode == WB_SYNC_ALL, |
de0022b9 | 4007 | .bio_flags = 0, |
d1310b2e CM |
4008 | }; |
4009 | ||
4bef0848 | 4010 | ret = extent_write_cache_pages(tree, mapping, wbc, |
d2c3f4f6 CM |
4011 | __extent_writepage, &epd, |
4012 | flush_write_bio); | |
ffbd517d | 4013 | flush_epd_write_bio(&epd); |
d1310b2e CM |
4014 | return ret; |
4015 | } | |
d1310b2e CM |
4016 | |
4017 | int extent_readpages(struct extent_io_tree *tree, | |
4018 | struct address_space *mapping, | |
4019 | struct list_head *pages, unsigned nr_pages, | |
4020 | get_extent_t get_extent) | |
4021 | { | |
4022 | struct bio *bio = NULL; | |
4023 | unsigned page_idx; | |
c8b97818 | 4024 | unsigned long bio_flags = 0; |
67c9684f LB |
4025 | struct page *pagepool[16]; |
4026 | struct page *page; | |
125bac01 | 4027 | struct extent_map *em_cached = NULL; |
67c9684f | 4028 | int nr = 0; |
d1310b2e | 4029 | |
d1310b2e | 4030 | for (page_idx = 0; page_idx < nr_pages; page_idx++) { |
67c9684f | 4031 | page = list_entry(pages->prev, struct page, lru); |
d1310b2e CM |
4032 | |
4033 | prefetchw(&page->flags); | |
4034 | list_del(&page->lru); | |
67c9684f | 4035 | if (add_to_page_cache_lru(page, mapping, |
43e817a1 | 4036 | page->index, GFP_NOFS)) { |
67c9684f LB |
4037 | page_cache_release(page); |
4038 | continue; | |
d1310b2e | 4039 | } |
67c9684f LB |
4040 | |
4041 | pagepool[nr++] = page; | |
4042 | if (nr < ARRAY_SIZE(pagepool)) | |
4043 | continue; | |
125bac01 | 4044 | __extent_readpages(tree, pagepool, nr, get_extent, &em_cached, |
9974090b | 4045 | &bio, 0, &bio_flags, READ); |
67c9684f | 4046 | nr = 0; |
d1310b2e | 4047 | } |
9974090b | 4048 | if (nr) |
125bac01 | 4049 | __extent_readpages(tree, pagepool, nr, get_extent, &em_cached, |
9974090b | 4050 | &bio, 0, &bio_flags, READ); |
67c9684f | 4051 | |
125bac01 MX |
4052 | if (em_cached) |
4053 | free_extent_map(em_cached); | |
4054 | ||
d1310b2e CM |
4055 | BUG_ON(!list_empty(pages)); |
4056 | if (bio) | |
79787eaa | 4057 | return submit_one_bio(READ, bio, 0, bio_flags); |
d1310b2e CM |
4058 | return 0; |
4059 | } | |
d1310b2e CM |
4060 | |
4061 | /* | |
4062 | * basic invalidatepage code, this waits on any locked or writeback | |
4063 | * ranges corresponding to the page, and then deletes any extent state | |
4064 | * records from the tree | |
4065 | */ | |
4066 | int extent_invalidatepage(struct extent_io_tree *tree, | |
4067 | struct page *page, unsigned long offset) | |
4068 | { | |
2ac55d41 | 4069 | struct extent_state *cached_state = NULL; |
4eee4fa4 | 4070 | u64 start = page_offset(page); |
d1310b2e CM |
4071 | u64 end = start + PAGE_CACHE_SIZE - 1; |
4072 | size_t blocksize = page->mapping->host->i_sb->s_blocksize; | |
4073 | ||
fda2832f | 4074 | start += ALIGN(offset, blocksize); |
d1310b2e CM |
4075 | if (start > end) |
4076 | return 0; | |
4077 | ||
d0082371 | 4078 | lock_extent_bits(tree, start, end, 0, &cached_state); |
1edbb734 | 4079 | wait_on_page_writeback(page); |
d1310b2e | 4080 | clear_extent_bit(tree, start, end, |
32c00aff JB |
4081 | EXTENT_LOCKED | EXTENT_DIRTY | EXTENT_DELALLOC | |
4082 | EXTENT_DO_ACCOUNTING, | |
2ac55d41 | 4083 | 1, 1, &cached_state, GFP_NOFS); |
d1310b2e CM |
4084 | return 0; |
4085 | } | |
d1310b2e | 4086 | |
7b13b7b1 CM |
4087 | /* |
4088 | * a helper for releasepage, this tests for areas of the page that | |
4089 | * are locked or under IO and drops the related state bits if it is safe | |
4090 | * to drop the page. | |
4091 | */ | |
48a3b636 ES |
4092 | static int try_release_extent_state(struct extent_map_tree *map, |
4093 | struct extent_io_tree *tree, | |
4094 | struct page *page, gfp_t mask) | |
7b13b7b1 | 4095 | { |
4eee4fa4 | 4096 | u64 start = page_offset(page); |
7b13b7b1 CM |
4097 | u64 end = start + PAGE_CACHE_SIZE - 1; |
4098 | int ret = 1; | |
4099 | ||
211f90e6 | 4100 | if (test_range_bit(tree, start, end, |
8b62b72b | 4101 | EXTENT_IOBITS, 0, NULL)) |
7b13b7b1 CM |
4102 | ret = 0; |
4103 | else { | |
4104 | if ((mask & GFP_NOFS) == GFP_NOFS) | |
4105 | mask = GFP_NOFS; | |
11ef160f CM |
4106 | /* |
4107 | * at this point we can safely clear everything except the | |
4108 | * locked bit and the nodatasum bit | |
4109 | */ | |
e3f24cc5 | 4110 | ret = clear_extent_bit(tree, start, end, |
11ef160f CM |
4111 | ~(EXTENT_LOCKED | EXTENT_NODATASUM), |
4112 | 0, 0, NULL, mask); | |
e3f24cc5 CM |
4113 | |
4114 | /* if clear_extent_bit failed for enomem reasons, | |
4115 | * we can't allow the release to continue. | |
4116 | */ | |
4117 | if (ret < 0) | |
4118 | ret = 0; | |
4119 | else | |
4120 | ret = 1; | |
7b13b7b1 CM |
4121 | } |
4122 | return ret; | |
4123 | } | |
7b13b7b1 | 4124 | |
d1310b2e CM |
4125 | /* |
4126 | * a helper for releasepage. As long as there are no locked extents | |
4127 | * in the range corresponding to the page, both state records and extent | |
4128 | * map records are removed | |
4129 | */ | |
4130 | int try_release_extent_mapping(struct extent_map_tree *map, | |
70dec807 CM |
4131 | struct extent_io_tree *tree, struct page *page, |
4132 | gfp_t mask) | |
d1310b2e CM |
4133 | { |
4134 | struct extent_map *em; | |
4eee4fa4 | 4135 | u64 start = page_offset(page); |
d1310b2e | 4136 | u64 end = start + PAGE_CACHE_SIZE - 1; |
7b13b7b1 | 4137 | |
70dec807 CM |
4138 | if ((mask & __GFP_WAIT) && |
4139 | page->mapping->host->i_size > 16 * 1024 * 1024) { | |
39b5637f | 4140 | u64 len; |
70dec807 | 4141 | while (start <= end) { |
39b5637f | 4142 | len = end - start + 1; |
890871be | 4143 | write_lock(&map->lock); |
39b5637f | 4144 | em = lookup_extent_mapping(map, start, len); |
285190d9 | 4145 | if (!em) { |
890871be | 4146 | write_unlock(&map->lock); |
70dec807 CM |
4147 | break; |
4148 | } | |
7f3c74fb CM |
4149 | if (test_bit(EXTENT_FLAG_PINNED, &em->flags) || |
4150 | em->start != start) { | |
890871be | 4151 | write_unlock(&map->lock); |
70dec807 CM |
4152 | free_extent_map(em); |
4153 | break; | |
4154 | } | |
4155 | if (!test_range_bit(tree, em->start, | |
4156 | extent_map_end(em) - 1, | |
8b62b72b | 4157 | EXTENT_LOCKED | EXTENT_WRITEBACK, |
9655d298 | 4158 | 0, NULL)) { |
70dec807 CM |
4159 | remove_extent_mapping(map, em); |
4160 | /* once for the rb tree */ | |
4161 | free_extent_map(em); | |
4162 | } | |
4163 | start = extent_map_end(em); | |
890871be | 4164 | write_unlock(&map->lock); |
70dec807 CM |
4165 | |
4166 | /* once for us */ | |
d1310b2e CM |
4167 | free_extent_map(em); |
4168 | } | |
d1310b2e | 4169 | } |
7b13b7b1 | 4170 | return try_release_extent_state(map, tree, page, mask); |
d1310b2e | 4171 | } |
d1310b2e | 4172 | |
ec29ed5b CM |
4173 | /* |
4174 | * helper function for fiemap, which doesn't want to see any holes. | |
4175 | * This maps until we find something past 'last' | |
4176 | */ | |
4177 | static struct extent_map *get_extent_skip_holes(struct inode *inode, | |
4178 | u64 offset, | |
4179 | u64 last, | |
4180 | get_extent_t *get_extent) | |
4181 | { | |
4182 | u64 sectorsize = BTRFS_I(inode)->root->sectorsize; | |
4183 | struct extent_map *em; | |
4184 | u64 len; | |
4185 | ||
4186 | if (offset >= last) | |
4187 | return NULL; | |
4188 | ||
67871254 | 4189 | while (1) { |
ec29ed5b CM |
4190 | len = last - offset; |
4191 | if (len == 0) | |
4192 | break; | |
fda2832f | 4193 | len = ALIGN(len, sectorsize); |
ec29ed5b | 4194 | em = get_extent(inode, NULL, 0, offset, len, 0); |
c704005d | 4195 | if (IS_ERR_OR_NULL(em)) |
ec29ed5b CM |
4196 | return em; |
4197 | ||
4198 | /* if this isn't a hole return it */ | |
4199 | if (!test_bit(EXTENT_FLAG_VACANCY, &em->flags) && | |
4200 | em->block_start != EXTENT_MAP_HOLE) { | |
4201 | return em; | |
4202 | } | |
4203 | ||
4204 | /* this is a hole, advance to the next extent */ | |
4205 | offset = extent_map_end(em); | |
4206 | free_extent_map(em); | |
4207 | if (offset >= last) | |
4208 | break; | |
4209 | } | |
4210 | return NULL; | |
4211 | } | |
4212 | ||
1506fcc8 YS |
4213 | int extent_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, |
4214 | __u64 start, __u64 len, get_extent_t *get_extent) | |
4215 | { | |
975f84fe | 4216 | int ret = 0; |
1506fcc8 YS |
4217 | u64 off = start; |
4218 | u64 max = start + len; | |
4219 | u32 flags = 0; | |
975f84fe JB |
4220 | u32 found_type; |
4221 | u64 last; | |
ec29ed5b | 4222 | u64 last_for_get_extent = 0; |
1506fcc8 | 4223 | u64 disko = 0; |
ec29ed5b | 4224 | u64 isize = i_size_read(inode); |
975f84fe | 4225 | struct btrfs_key found_key; |
1506fcc8 | 4226 | struct extent_map *em = NULL; |
2ac55d41 | 4227 | struct extent_state *cached_state = NULL; |
975f84fe | 4228 | struct btrfs_path *path; |
dc046b10 | 4229 | struct btrfs_root *root = BTRFS_I(inode)->root; |
1506fcc8 | 4230 | int end = 0; |
ec29ed5b CM |
4231 | u64 em_start = 0; |
4232 | u64 em_len = 0; | |
4233 | u64 em_end = 0; | |
1506fcc8 YS |
4234 | |
4235 | if (len == 0) | |
4236 | return -EINVAL; | |
4237 | ||
975f84fe JB |
4238 | path = btrfs_alloc_path(); |
4239 | if (!path) | |
4240 | return -ENOMEM; | |
4241 | path->leave_spinning = 1; | |
4242 | ||
2c91943b QW |
4243 | start = round_down(start, BTRFS_I(inode)->root->sectorsize); |
4244 | len = round_up(max, BTRFS_I(inode)->root->sectorsize) - start; | |
4d479cf0 | 4245 | |
ec29ed5b CM |
4246 | /* |
4247 | * lookup the last file extent. We're not using i_size here | |
4248 | * because there might be preallocation past i_size | |
4249 | */ | |
dc046b10 JB |
4250 | ret = btrfs_lookup_file_extent(NULL, root, path, btrfs_ino(inode), -1, |
4251 | 0); | |
975f84fe JB |
4252 | if (ret < 0) { |
4253 | btrfs_free_path(path); | |
4254 | return ret; | |
4255 | } | |
4256 | WARN_ON(!ret); | |
4257 | path->slots[0]--; | |
975f84fe | 4258 | btrfs_item_key_to_cpu(path->nodes[0], &found_key, path->slots[0]); |
962a298f | 4259 | found_type = found_key.type; |
975f84fe | 4260 | |
ec29ed5b | 4261 | /* No extents, but there might be delalloc bits */ |
33345d01 | 4262 | if (found_key.objectid != btrfs_ino(inode) || |
975f84fe | 4263 | found_type != BTRFS_EXTENT_DATA_KEY) { |
ec29ed5b CM |
4264 | /* have to trust i_size as the end */ |
4265 | last = (u64)-1; | |
4266 | last_for_get_extent = isize; | |
4267 | } else { | |
4268 | /* | |
4269 | * remember the start of the last extent. There are a | |
4270 | * bunch of different factors that go into the length of the | |
4271 | * extent, so its much less complex to remember where it started | |
4272 | */ | |
4273 | last = found_key.offset; | |
4274 | last_for_get_extent = last + 1; | |
975f84fe | 4275 | } |
fe09e16c | 4276 | btrfs_release_path(path); |
975f84fe | 4277 | |
ec29ed5b CM |
4278 | /* |
4279 | * we might have some extents allocated but more delalloc past those | |
4280 | * extents. so, we trust isize unless the start of the last extent is | |
4281 | * beyond isize | |
4282 | */ | |
4283 | if (last < isize) { | |
4284 | last = (u64)-1; | |
4285 | last_for_get_extent = isize; | |
4286 | } | |
4287 | ||
a52f4cd2 | 4288 | lock_extent_bits(&BTRFS_I(inode)->io_tree, start, start + len - 1, 0, |
d0082371 | 4289 | &cached_state); |
ec29ed5b | 4290 | |
4d479cf0 | 4291 | em = get_extent_skip_holes(inode, start, last_for_get_extent, |
ec29ed5b | 4292 | get_extent); |
1506fcc8 YS |
4293 | if (!em) |
4294 | goto out; | |
4295 | if (IS_ERR(em)) { | |
4296 | ret = PTR_ERR(em); | |
4297 | goto out; | |
4298 | } | |
975f84fe | 4299 | |
1506fcc8 | 4300 | while (!end) { |
b76bb701 | 4301 | u64 offset_in_extent = 0; |
ea8efc74 CM |
4302 | |
4303 | /* break if the extent we found is outside the range */ | |
4304 | if (em->start >= max || extent_map_end(em) < off) | |
4305 | break; | |
4306 | ||
4307 | /* | |
4308 | * get_extent may return an extent that starts before our | |
4309 | * requested range. We have to make sure the ranges | |
4310 | * we return to fiemap always move forward and don't | |
4311 | * overlap, so adjust the offsets here | |
4312 | */ | |
4313 | em_start = max(em->start, off); | |
1506fcc8 | 4314 | |
ea8efc74 CM |
4315 | /* |
4316 | * record the offset from the start of the extent | |
b76bb701 JB |
4317 | * for adjusting the disk offset below. Only do this if the |
4318 | * extent isn't compressed since our in ram offset may be past | |
4319 | * what we have actually allocated on disk. | |
ea8efc74 | 4320 | */ |
b76bb701 JB |
4321 | if (!test_bit(EXTENT_FLAG_COMPRESSED, &em->flags)) |
4322 | offset_in_extent = em_start - em->start; | |
ec29ed5b | 4323 | em_end = extent_map_end(em); |
ea8efc74 | 4324 | em_len = em_end - em_start; |
1506fcc8 YS |
4325 | disko = 0; |
4326 | flags = 0; | |
4327 | ||
ea8efc74 CM |
4328 | /* |
4329 | * bump off for our next call to get_extent | |
4330 | */ | |
4331 | off = extent_map_end(em); | |
4332 | if (off >= max) | |
4333 | end = 1; | |
4334 | ||
93dbfad7 | 4335 | if (em->block_start == EXTENT_MAP_LAST_BYTE) { |
1506fcc8 YS |
4336 | end = 1; |
4337 | flags |= FIEMAP_EXTENT_LAST; | |
93dbfad7 | 4338 | } else if (em->block_start == EXTENT_MAP_INLINE) { |
1506fcc8 YS |
4339 | flags |= (FIEMAP_EXTENT_DATA_INLINE | |
4340 | FIEMAP_EXTENT_NOT_ALIGNED); | |
93dbfad7 | 4341 | } else if (em->block_start == EXTENT_MAP_DELALLOC) { |
1506fcc8 YS |
4342 | flags |= (FIEMAP_EXTENT_DELALLOC | |
4343 | FIEMAP_EXTENT_UNKNOWN); | |
dc046b10 JB |
4344 | } else if (fieinfo->fi_extents_max) { |
4345 | u64 bytenr = em->block_start - | |
4346 | (em->start - em->orig_start); | |
fe09e16c | 4347 | |
ea8efc74 | 4348 | disko = em->block_start + offset_in_extent; |
fe09e16c LB |
4349 | |
4350 | /* | |
4351 | * As btrfs supports shared space, this information | |
4352 | * can be exported to userspace tools via | |
dc046b10 JB |
4353 | * flag FIEMAP_EXTENT_SHARED. If fi_extents_max == 0 |
4354 | * then we're just getting a count and we can skip the | |
4355 | * lookup stuff. | |
fe09e16c | 4356 | */ |
dc046b10 JB |
4357 | ret = btrfs_check_shared(NULL, root->fs_info, |
4358 | root->objectid, | |
4359 | btrfs_ino(inode), bytenr); | |
4360 | if (ret < 0) | |
fe09e16c | 4361 | goto out_free; |
dc046b10 | 4362 | if (ret) |
fe09e16c | 4363 | flags |= FIEMAP_EXTENT_SHARED; |
dc046b10 | 4364 | ret = 0; |
1506fcc8 YS |
4365 | } |
4366 | if (test_bit(EXTENT_FLAG_COMPRESSED, &em->flags)) | |
4367 | flags |= FIEMAP_EXTENT_ENCODED; | |
4368 | ||
1506fcc8 YS |
4369 | free_extent_map(em); |
4370 | em = NULL; | |
ec29ed5b CM |
4371 | if ((em_start >= last) || em_len == (u64)-1 || |
4372 | (last == (u64)-1 && isize <= em_end)) { | |
1506fcc8 YS |
4373 | flags |= FIEMAP_EXTENT_LAST; |
4374 | end = 1; | |
4375 | } | |
4376 | ||
ec29ed5b CM |
4377 | /* now scan forward to see if this is really the last extent. */ |
4378 | em = get_extent_skip_holes(inode, off, last_for_get_extent, | |
4379 | get_extent); | |
4380 | if (IS_ERR(em)) { | |
4381 | ret = PTR_ERR(em); | |
4382 | goto out; | |
4383 | } | |
4384 | if (!em) { | |
975f84fe JB |
4385 | flags |= FIEMAP_EXTENT_LAST; |
4386 | end = 1; | |
4387 | } | |
ec29ed5b CM |
4388 | ret = fiemap_fill_next_extent(fieinfo, em_start, disko, |
4389 | em_len, flags); | |
4390 | if (ret) | |
4391 | goto out_free; | |
1506fcc8 YS |
4392 | } |
4393 | out_free: | |
4394 | free_extent_map(em); | |
4395 | out: | |
fe09e16c | 4396 | btrfs_free_path(path); |
a52f4cd2 | 4397 | unlock_extent_cached(&BTRFS_I(inode)->io_tree, start, start + len - 1, |
2ac55d41 | 4398 | &cached_state, GFP_NOFS); |
1506fcc8 YS |
4399 | return ret; |
4400 | } | |
4401 | ||
727011e0 CM |
4402 | static void __free_extent_buffer(struct extent_buffer *eb) |
4403 | { | |
6d49ba1b | 4404 | btrfs_leak_debug_del(&eb->leak_list); |
727011e0 CM |
4405 | kmem_cache_free(extent_buffer_cache, eb); |
4406 | } | |
4407 | ||
a26e8c9f | 4408 | int extent_buffer_under_io(struct extent_buffer *eb) |
db7f3436 JB |
4409 | { |
4410 | return (atomic_read(&eb->io_pages) || | |
4411 | test_bit(EXTENT_BUFFER_WRITEBACK, &eb->bflags) || | |
4412 | test_bit(EXTENT_BUFFER_DIRTY, &eb->bflags)); | |
4413 | } | |
4414 | ||
4415 | /* | |
4416 | * Helper for releasing extent buffer page. | |
4417 | */ | |
4418 | static void btrfs_release_extent_buffer_page(struct extent_buffer *eb, | |
4419 | unsigned long start_idx) | |
4420 | { | |
4421 | unsigned long index; | |
4422 | unsigned long num_pages; | |
4423 | struct page *page; | |
4424 | int mapped = !test_bit(EXTENT_BUFFER_DUMMY, &eb->bflags); | |
4425 | ||
4426 | BUG_ON(extent_buffer_under_io(eb)); | |
4427 | ||
4428 | num_pages = num_extent_pages(eb->start, eb->len); | |
4429 | index = start_idx + num_pages; | |
4430 | if (start_idx >= index) | |
4431 | return; | |
4432 | ||
4433 | do { | |
4434 | index--; | |
4435 | page = extent_buffer_page(eb, index); | |
4436 | if (page && mapped) { | |
4437 | spin_lock(&page->mapping->private_lock); | |
4438 | /* | |
4439 | * We do this since we'll remove the pages after we've | |
4440 | * removed the eb from the radix tree, so we could race | |
4441 | * and have this page now attached to the new eb. So | |
4442 | * only clear page_private if it's still connected to | |
4443 | * this eb. | |
4444 | */ | |
4445 | if (PagePrivate(page) && | |
4446 | page->private == (unsigned long)eb) { | |
4447 | BUG_ON(test_bit(EXTENT_BUFFER_DIRTY, &eb->bflags)); | |
4448 | BUG_ON(PageDirty(page)); | |
4449 | BUG_ON(PageWriteback(page)); | |
4450 | /* | |
4451 | * We need to make sure we haven't be attached | |
4452 | * to a new eb. | |
4453 | */ | |
4454 | ClearPagePrivate(page); | |
4455 | set_page_private(page, 0); | |
4456 | /* One for the page private */ | |
4457 | page_cache_release(page); | |
4458 | } | |
4459 | spin_unlock(&page->mapping->private_lock); | |
4460 | ||
4461 | } | |
4462 | if (page) { | |
4463 | /* One for when we alloced the page */ | |
4464 | page_cache_release(page); | |
4465 | } | |
4466 | } while (index != start_idx); | |
4467 | } | |
4468 | ||
4469 | /* | |
4470 | * Helper for releasing the extent buffer. | |
4471 | */ | |
4472 | static inline void btrfs_release_extent_buffer(struct extent_buffer *eb) | |
4473 | { | |
4474 | btrfs_release_extent_buffer_page(eb, 0); | |
4475 | __free_extent_buffer(eb); | |
4476 | } | |
4477 | ||
f28491e0 JB |
4478 | static struct extent_buffer * |
4479 | __alloc_extent_buffer(struct btrfs_fs_info *fs_info, u64 start, | |
4480 | unsigned long len, gfp_t mask) | |
d1310b2e CM |
4481 | { |
4482 | struct extent_buffer *eb = NULL; | |
4483 | ||
d1310b2e | 4484 | eb = kmem_cache_zalloc(extent_buffer_cache, mask); |
91ca338d TI |
4485 | if (eb == NULL) |
4486 | return NULL; | |
d1310b2e CM |
4487 | eb->start = start; |
4488 | eb->len = len; | |
f28491e0 | 4489 | eb->fs_info = fs_info; |
815a51c7 | 4490 | eb->bflags = 0; |
bd681513 CM |
4491 | rwlock_init(&eb->lock); |
4492 | atomic_set(&eb->write_locks, 0); | |
4493 | atomic_set(&eb->read_locks, 0); | |
4494 | atomic_set(&eb->blocking_readers, 0); | |
4495 | atomic_set(&eb->blocking_writers, 0); | |
4496 | atomic_set(&eb->spinning_readers, 0); | |
4497 | atomic_set(&eb->spinning_writers, 0); | |
5b25f70f | 4498 | eb->lock_nested = 0; |
bd681513 CM |
4499 | init_waitqueue_head(&eb->write_lock_wq); |
4500 | init_waitqueue_head(&eb->read_lock_wq); | |
b4ce94de | 4501 | |
6d49ba1b ES |
4502 | btrfs_leak_debug_add(&eb->leak_list, &buffers); |
4503 | ||
3083ee2e | 4504 | spin_lock_init(&eb->refs_lock); |
d1310b2e | 4505 | atomic_set(&eb->refs, 1); |
0b32f4bb | 4506 | atomic_set(&eb->io_pages, 0); |
727011e0 | 4507 | |
b8dae313 DS |
4508 | /* |
4509 | * Sanity checks, currently the maximum is 64k covered by 16x 4k pages | |
4510 | */ | |
4511 | BUILD_BUG_ON(BTRFS_MAX_METADATA_BLOCKSIZE | |
4512 | > MAX_INLINE_EXTENT_BUFFER_SIZE); | |
4513 | BUG_ON(len > MAX_INLINE_EXTENT_BUFFER_SIZE); | |
d1310b2e CM |
4514 | |
4515 | return eb; | |
4516 | } | |
4517 | ||
815a51c7 JS |
4518 | struct extent_buffer *btrfs_clone_extent_buffer(struct extent_buffer *src) |
4519 | { | |
4520 | unsigned long i; | |
4521 | struct page *p; | |
4522 | struct extent_buffer *new; | |
4523 | unsigned long num_pages = num_extent_pages(src->start, src->len); | |
4524 | ||
9ec72677 | 4525 | new = __alloc_extent_buffer(NULL, src->start, src->len, GFP_NOFS); |
815a51c7 JS |
4526 | if (new == NULL) |
4527 | return NULL; | |
4528 | ||
4529 | for (i = 0; i < num_pages; i++) { | |
9ec72677 | 4530 | p = alloc_page(GFP_NOFS); |
db7f3436 JB |
4531 | if (!p) { |
4532 | btrfs_release_extent_buffer(new); | |
4533 | return NULL; | |
4534 | } | |
815a51c7 JS |
4535 | attach_extent_buffer_page(new, p); |
4536 | WARN_ON(PageDirty(p)); | |
4537 | SetPageUptodate(p); | |
4538 | new->pages[i] = p; | |
4539 | } | |
4540 | ||
4541 | copy_extent_buffer(new, src, 0, 0, src->len); | |
4542 | set_bit(EXTENT_BUFFER_UPTODATE, &new->bflags); | |
4543 | set_bit(EXTENT_BUFFER_DUMMY, &new->bflags); | |
4544 | ||
4545 | return new; | |
4546 | } | |
4547 | ||
4548 | struct extent_buffer *alloc_dummy_extent_buffer(u64 start, unsigned long len) | |
4549 | { | |
4550 | struct extent_buffer *eb; | |
4551 | unsigned long num_pages = num_extent_pages(0, len); | |
4552 | unsigned long i; | |
4553 | ||
9ec72677 | 4554 | eb = __alloc_extent_buffer(NULL, start, len, GFP_NOFS); |
815a51c7 JS |
4555 | if (!eb) |
4556 | return NULL; | |
4557 | ||
4558 | for (i = 0; i < num_pages; i++) { | |
9ec72677 | 4559 | eb->pages[i] = alloc_page(GFP_NOFS); |
815a51c7 JS |
4560 | if (!eb->pages[i]) |
4561 | goto err; | |
4562 | } | |
4563 | set_extent_buffer_uptodate(eb); | |
4564 | btrfs_set_header_nritems(eb, 0); | |
4565 | set_bit(EXTENT_BUFFER_DUMMY, &eb->bflags); | |
4566 | ||
4567 | return eb; | |
4568 | err: | |
84167d19 SB |
4569 | for (; i > 0; i--) |
4570 | __free_page(eb->pages[i - 1]); | |
815a51c7 JS |
4571 | __free_extent_buffer(eb); |
4572 | return NULL; | |
4573 | } | |
4574 | ||
0b32f4bb JB |
4575 | static void check_buffer_tree_ref(struct extent_buffer *eb) |
4576 | { | |
242e18c7 | 4577 | int refs; |
0b32f4bb JB |
4578 | /* the ref bit is tricky. We have to make sure it is set |
4579 | * if we have the buffer dirty. Otherwise the | |
4580 | * code to free a buffer can end up dropping a dirty | |
4581 | * page | |
4582 | * | |
4583 | * Once the ref bit is set, it won't go away while the | |
4584 | * buffer is dirty or in writeback, and it also won't | |
4585 | * go away while we have the reference count on the | |
4586 | * eb bumped. | |
4587 | * | |
4588 | * We can't just set the ref bit without bumping the | |
4589 | * ref on the eb because free_extent_buffer might | |
4590 | * see the ref bit and try to clear it. If this happens | |
4591 | * free_extent_buffer might end up dropping our original | |
4592 | * ref by mistake and freeing the page before we are able | |
4593 | * to add one more ref. | |
4594 | * | |
4595 | * So bump the ref count first, then set the bit. If someone | |
4596 | * beat us to it, drop the ref we added. | |
4597 | */ | |
242e18c7 CM |
4598 | refs = atomic_read(&eb->refs); |
4599 | if (refs >= 2 && test_bit(EXTENT_BUFFER_TREE_REF, &eb->bflags)) | |
4600 | return; | |
4601 | ||
594831c4 JB |
4602 | spin_lock(&eb->refs_lock); |
4603 | if (!test_and_set_bit(EXTENT_BUFFER_TREE_REF, &eb->bflags)) | |
0b32f4bb | 4604 | atomic_inc(&eb->refs); |
594831c4 | 4605 | spin_unlock(&eb->refs_lock); |
0b32f4bb JB |
4606 | } |
4607 | ||
2457aec6 MG |
4608 | static void mark_extent_buffer_accessed(struct extent_buffer *eb, |
4609 | struct page *accessed) | |
5df4235e JB |
4610 | { |
4611 | unsigned long num_pages, i; | |
4612 | ||
0b32f4bb JB |
4613 | check_buffer_tree_ref(eb); |
4614 | ||
5df4235e JB |
4615 | num_pages = num_extent_pages(eb->start, eb->len); |
4616 | for (i = 0; i < num_pages; i++) { | |
4617 | struct page *p = extent_buffer_page(eb, i); | |
2457aec6 MG |
4618 | if (p != accessed) |
4619 | mark_page_accessed(p); | |
5df4235e JB |
4620 | } |
4621 | } | |
4622 | ||
f28491e0 JB |
4623 | struct extent_buffer *find_extent_buffer(struct btrfs_fs_info *fs_info, |
4624 | u64 start) | |
452c75c3 CS |
4625 | { |
4626 | struct extent_buffer *eb; | |
4627 | ||
4628 | rcu_read_lock(); | |
f28491e0 JB |
4629 | eb = radix_tree_lookup(&fs_info->buffer_radix, |
4630 | start >> PAGE_CACHE_SHIFT); | |
452c75c3 CS |
4631 | if (eb && atomic_inc_not_zero(&eb->refs)) { |
4632 | rcu_read_unlock(); | |
2457aec6 | 4633 | mark_extent_buffer_accessed(eb, NULL); |
452c75c3 CS |
4634 | return eb; |
4635 | } | |
4636 | rcu_read_unlock(); | |
4637 | ||
4638 | return NULL; | |
4639 | } | |
4640 | ||
faa2dbf0 JB |
4641 | #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS |
4642 | struct extent_buffer *alloc_test_extent_buffer(struct btrfs_fs_info *fs_info, | |
4643 | u64 start, unsigned long len) | |
4644 | { | |
4645 | struct extent_buffer *eb, *exists = NULL; | |
4646 | int ret; | |
4647 | ||
4648 | eb = find_extent_buffer(fs_info, start); | |
4649 | if (eb) | |
4650 | return eb; | |
4651 | eb = alloc_dummy_extent_buffer(start, len); | |
4652 | if (!eb) | |
4653 | return NULL; | |
4654 | eb->fs_info = fs_info; | |
4655 | again: | |
4656 | ret = radix_tree_preload(GFP_NOFS & ~__GFP_HIGHMEM); | |
4657 | if (ret) | |
4658 | goto free_eb; | |
4659 | spin_lock(&fs_info->buffer_lock); | |
4660 | ret = radix_tree_insert(&fs_info->buffer_radix, | |
4661 | start >> PAGE_CACHE_SHIFT, eb); | |
4662 | spin_unlock(&fs_info->buffer_lock); | |
4663 | radix_tree_preload_end(); | |
4664 | if (ret == -EEXIST) { | |
4665 | exists = find_extent_buffer(fs_info, start); | |
4666 | if (exists) | |
4667 | goto free_eb; | |
4668 | else | |
4669 | goto again; | |
4670 | } | |
4671 | check_buffer_tree_ref(eb); | |
4672 | set_bit(EXTENT_BUFFER_IN_TREE, &eb->bflags); | |
4673 | ||
4674 | /* | |
4675 | * We will free dummy extent buffer's if they come into | |
4676 | * free_extent_buffer with a ref count of 2, but if we are using this we | |
4677 | * want the buffers to stay in memory until we're done with them, so | |
4678 | * bump the ref count again. | |
4679 | */ | |
4680 | atomic_inc(&eb->refs); | |
4681 | return eb; | |
4682 | free_eb: | |
4683 | btrfs_release_extent_buffer(eb); | |
4684 | return exists; | |
4685 | } | |
4686 | #endif | |
4687 | ||
f28491e0 | 4688 | struct extent_buffer *alloc_extent_buffer(struct btrfs_fs_info *fs_info, |
727011e0 | 4689 | u64 start, unsigned long len) |
d1310b2e CM |
4690 | { |
4691 | unsigned long num_pages = num_extent_pages(start, len); | |
4692 | unsigned long i; | |
4693 | unsigned long index = start >> PAGE_CACHE_SHIFT; | |
4694 | struct extent_buffer *eb; | |
6af118ce | 4695 | struct extent_buffer *exists = NULL; |
d1310b2e | 4696 | struct page *p; |
f28491e0 | 4697 | struct address_space *mapping = fs_info->btree_inode->i_mapping; |
d1310b2e | 4698 | int uptodate = 1; |
19fe0a8b | 4699 | int ret; |
d1310b2e | 4700 | |
f28491e0 | 4701 | eb = find_extent_buffer(fs_info, start); |
452c75c3 | 4702 | if (eb) |
6af118ce | 4703 | return eb; |
6af118ce | 4704 | |
f28491e0 | 4705 | eb = __alloc_extent_buffer(fs_info, start, len, GFP_NOFS); |
2b114d1d | 4706 | if (!eb) |
d1310b2e CM |
4707 | return NULL; |
4708 | ||
727011e0 | 4709 | for (i = 0; i < num_pages; i++, index++) { |
a6591715 | 4710 | p = find_or_create_page(mapping, index, GFP_NOFS); |
4804b382 | 4711 | if (!p) |
6af118ce | 4712 | goto free_eb; |
4f2de97a JB |
4713 | |
4714 | spin_lock(&mapping->private_lock); | |
4715 | if (PagePrivate(p)) { | |
4716 | /* | |
4717 | * We could have already allocated an eb for this page | |
4718 | * and attached one so lets see if we can get a ref on | |
4719 | * the existing eb, and if we can we know it's good and | |
4720 | * we can just return that one, else we know we can just | |
4721 | * overwrite page->private. | |
4722 | */ | |
4723 | exists = (struct extent_buffer *)p->private; | |
4724 | if (atomic_inc_not_zero(&exists->refs)) { | |
4725 | spin_unlock(&mapping->private_lock); | |
4726 | unlock_page(p); | |
17de39ac | 4727 | page_cache_release(p); |
2457aec6 | 4728 | mark_extent_buffer_accessed(exists, p); |
4f2de97a JB |
4729 | goto free_eb; |
4730 | } | |
4731 | ||
0b32f4bb | 4732 | /* |
4f2de97a JB |
4733 | * Do this so attach doesn't complain and we need to |
4734 | * drop the ref the old guy had. | |
4735 | */ | |
4736 | ClearPagePrivate(p); | |
0b32f4bb | 4737 | WARN_ON(PageDirty(p)); |
4f2de97a | 4738 | page_cache_release(p); |
d1310b2e | 4739 | } |
4f2de97a JB |
4740 | attach_extent_buffer_page(eb, p); |
4741 | spin_unlock(&mapping->private_lock); | |
0b32f4bb | 4742 | WARN_ON(PageDirty(p)); |
727011e0 | 4743 | eb->pages[i] = p; |
d1310b2e CM |
4744 | if (!PageUptodate(p)) |
4745 | uptodate = 0; | |
eb14ab8e CM |
4746 | |
4747 | /* | |
4748 | * see below about how we avoid a nasty race with release page | |
4749 | * and why we unlock later | |
4750 | */ | |
d1310b2e CM |
4751 | } |
4752 | if (uptodate) | |
b4ce94de | 4753 | set_bit(EXTENT_BUFFER_UPTODATE, &eb->bflags); |
115391d2 | 4754 | again: |
19fe0a8b MX |
4755 | ret = radix_tree_preload(GFP_NOFS & ~__GFP_HIGHMEM); |
4756 | if (ret) | |
4757 | goto free_eb; | |
4758 | ||
f28491e0 JB |
4759 | spin_lock(&fs_info->buffer_lock); |
4760 | ret = radix_tree_insert(&fs_info->buffer_radix, | |
4761 | start >> PAGE_CACHE_SHIFT, eb); | |
4762 | spin_unlock(&fs_info->buffer_lock); | |
452c75c3 | 4763 | radix_tree_preload_end(); |
19fe0a8b | 4764 | if (ret == -EEXIST) { |
f28491e0 | 4765 | exists = find_extent_buffer(fs_info, start); |
452c75c3 CS |
4766 | if (exists) |
4767 | goto free_eb; | |
4768 | else | |
115391d2 | 4769 | goto again; |
6af118ce | 4770 | } |
6af118ce | 4771 | /* add one reference for the tree */ |
0b32f4bb | 4772 | check_buffer_tree_ref(eb); |
34b41ace | 4773 | set_bit(EXTENT_BUFFER_IN_TREE, &eb->bflags); |
eb14ab8e CM |
4774 | |
4775 | /* | |
4776 | * there is a race where release page may have | |
4777 | * tried to find this extent buffer in the radix | |
4778 | * but failed. It will tell the VM it is safe to | |
4779 | * reclaim the, and it will clear the page private bit. | |
4780 | * We must make sure to set the page private bit properly | |
4781 | * after the extent buffer is in the radix tree so | |
4782 | * it doesn't get lost | |
4783 | */ | |
727011e0 CM |
4784 | SetPageChecked(eb->pages[0]); |
4785 | for (i = 1; i < num_pages; i++) { | |
4786 | p = extent_buffer_page(eb, i); | |
727011e0 CM |
4787 | ClearPageChecked(p); |
4788 | unlock_page(p); | |
4789 | } | |
4790 | unlock_page(eb->pages[0]); | |
d1310b2e CM |
4791 | return eb; |
4792 | ||
6af118ce | 4793 | free_eb: |
727011e0 CM |
4794 | for (i = 0; i < num_pages; i++) { |
4795 | if (eb->pages[i]) | |
4796 | unlock_page(eb->pages[i]); | |
4797 | } | |
eb14ab8e | 4798 | |
17de39ac | 4799 | WARN_ON(!atomic_dec_and_test(&eb->refs)); |
897ca6e9 | 4800 | btrfs_release_extent_buffer(eb); |
6af118ce | 4801 | return exists; |
d1310b2e | 4802 | } |
d1310b2e | 4803 | |
3083ee2e JB |
4804 | static inline void btrfs_release_extent_buffer_rcu(struct rcu_head *head) |
4805 | { | |
4806 | struct extent_buffer *eb = | |
4807 | container_of(head, struct extent_buffer, rcu_head); | |
4808 | ||
4809 | __free_extent_buffer(eb); | |
4810 | } | |
4811 | ||
3083ee2e | 4812 | /* Expects to have eb->eb_lock already held */ |
f7a52a40 | 4813 | static int release_extent_buffer(struct extent_buffer *eb) |
3083ee2e JB |
4814 | { |
4815 | WARN_ON(atomic_read(&eb->refs) == 0); | |
4816 | if (atomic_dec_and_test(&eb->refs)) { | |
34b41ace | 4817 | if (test_and_clear_bit(EXTENT_BUFFER_IN_TREE, &eb->bflags)) { |
f28491e0 | 4818 | struct btrfs_fs_info *fs_info = eb->fs_info; |
3083ee2e | 4819 | |
815a51c7 | 4820 | spin_unlock(&eb->refs_lock); |
3083ee2e | 4821 | |
f28491e0 JB |
4822 | spin_lock(&fs_info->buffer_lock); |
4823 | radix_tree_delete(&fs_info->buffer_radix, | |
815a51c7 | 4824 | eb->start >> PAGE_CACHE_SHIFT); |
f28491e0 | 4825 | spin_unlock(&fs_info->buffer_lock); |
34b41ace JB |
4826 | } else { |
4827 | spin_unlock(&eb->refs_lock); | |
815a51c7 | 4828 | } |
3083ee2e JB |
4829 | |
4830 | /* Should be safe to release our pages at this point */ | |
4831 | btrfs_release_extent_buffer_page(eb, 0); | |
3083ee2e | 4832 | call_rcu(&eb->rcu_head, btrfs_release_extent_buffer_rcu); |
e64860aa | 4833 | return 1; |
3083ee2e JB |
4834 | } |
4835 | spin_unlock(&eb->refs_lock); | |
e64860aa JB |
4836 | |
4837 | return 0; | |
3083ee2e JB |
4838 | } |
4839 | ||
d1310b2e CM |
4840 | void free_extent_buffer(struct extent_buffer *eb) |
4841 | { | |
242e18c7 CM |
4842 | int refs; |
4843 | int old; | |
d1310b2e CM |
4844 | if (!eb) |
4845 | return; | |
4846 | ||
242e18c7 CM |
4847 | while (1) { |
4848 | refs = atomic_read(&eb->refs); | |
4849 | if (refs <= 3) | |
4850 | break; | |
4851 | old = atomic_cmpxchg(&eb->refs, refs, refs - 1); | |
4852 | if (old == refs) | |
4853 | return; | |
4854 | } | |
4855 | ||
3083ee2e | 4856 | spin_lock(&eb->refs_lock); |
815a51c7 JS |
4857 | if (atomic_read(&eb->refs) == 2 && |
4858 | test_bit(EXTENT_BUFFER_DUMMY, &eb->bflags)) | |
4859 | atomic_dec(&eb->refs); | |
4860 | ||
3083ee2e JB |
4861 | if (atomic_read(&eb->refs) == 2 && |
4862 | test_bit(EXTENT_BUFFER_STALE, &eb->bflags) && | |
0b32f4bb | 4863 | !extent_buffer_under_io(eb) && |
3083ee2e JB |
4864 | test_and_clear_bit(EXTENT_BUFFER_TREE_REF, &eb->bflags)) |
4865 | atomic_dec(&eb->refs); | |
4866 | ||
4867 | /* | |
4868 | * I know this is terrible, but it's temporary until we stop tracking | |
4869 | * the uptodate bits and such for the extent buffers. | |
4870 | */ | |
f7a52a40 | 4871 | release_extent_buffer(eb); |
3083ee2e JB |
4872 | } |
4873 | ||
4874 | void free_extent_buffer_stale(struct extent_buffer *eb) | |
4875 | { | |
4876 | if (!eb) | |
d1310b2e CM |
4877 | return; |
4878 | ||
3083ee2e JB |
4879 | spin_lock(&eb->refs_lock); |
4880 | set_bit(EXTENT_BUFFER_STALE, &eb->bflags); | |
4881 | ||
0b32f4bb | 4882 | if (atomic_read(&eb->refs) == 2 && !extent_buffer_under_io(eb) && |
3083ee2e JB |
4883 | test_and_clear_bit(EXTENT_BUFFER_TREE_REF, &eb->bflags)) |
4884 | atomic_dec(&eb->refs); | |
f7a52a40 | 4885 | release_extent_buffer(eb); |
d1310b2e | 4886 | } |
d1310b2e | 4887 | |
1d4284bd | 4888 | void clear_extent_buffer_dirty(struct extent_buffer *eb) |
d1310b2e | 4889 | { |
d1310b2e CM |
4890 | unsigned long i; |
4891 | unsigned long num_pages; | |
4892 | struct page *page; | |
4893 | ||
d1310b2e CM |
4894 | num_pages = num_extent_pages(eb->start, eb->len); |
4895 | ||
4896 | for (i = 0; i < num_pages; i++) { | |
4897 | page = extent_buffer_page(eb, i); | |
b9473439 | 4898 | if (!PageDirty(page)) |
d2c3f4f6 CM |
4899 | continue; |
4900 | ||
a61e6f29 | 4901 | lock_page(page); |
eb14ab8e CM |
4902 | WARN_ON(!PagePrivate(page)); |
4903 | ||
d1310b2e | 4904 | clear_page_dirty_for_io(page); |
0ee0fda0 | 4905 | spin_lock_irq(&page->mapping->tree_lock); |
d1310b2e CM |
4906 | if (!PageDirty(page)) { |
4907 | radix_tree_tag_clear(&page->mapping->page_tree, | |
4908 | page_index(page), | |
4909 | PAGECACHE_TAG_DIRTY); | |
4910 | } | |
0ee0fda0 | 4911 | spin_unlock_irq(&page->mapping->tree_lock); |
bf0da8c1 | 4912 | ClearPageError(page); |
a61e6f29 | 4913 | unlock_page(page); |
d1310b2e | 4914 | } |
0b32f4bb | 4915 | WARN_ON(atomic_read(&eb->refs) == 0); |
d1310b2e | 4916 | } |
d1310b2e | 4917 | |
0b32f4bb | 4918 | int set_extent_buffer_dirty(struct extent_buffer *eb) |
d1310b2e CM |
4919 | { |
4920 | unsigned long i; | |
4921 | unsigned long num_pages; | |
b9473439 | 4922 | int was_dirty = 0; |
d1310b2e | 4923 | |
0b32f4bb JB |
4924 | check_buffer_tree_ref(eb); |
4925 | ||
b9473439 | 4926 | was_dirty = test_and_set_bit(EXTENT_BUFFER_DIRTY, &eb->bflags); |
0b32f4bb | 4927 | |
d1310b2e | 4928 | num_pages = num_extent_pages(eb->start, eb->len); |
3083ee2e | 4929 | WARN_ON(atomic_read(&eb->refs) == 0); |
0b32f4bb JB |
4930 | WARN_ON(!test_bit(EXTENT_BUFFER_TREE_REF, &eb->bflags)); |
4931 | ||
b9473439 | 4932 | for (i = 0; i < num_pages; i++) |
0b32f4bb | 4933 | set_page_dirty(extent_buffer_page(eb, i)); |
b9473439 | 4934 | return was_dirty; |
d1310b2e | 4935 | } |
d1310b2e | 4936 | |
0b32f4bb | 4937 | int clear_extent_buffer_uptodate(struct extent_buffer *eb) |
1259ab75 CM |
4938 | { |
4939 | unsigned long i; | |
4940 | struct page *page; | |
4941 | unsigned long num_pages; | |
4942 | ||
b4ce94de | 4943 | clear_bit(EXTENT_BUFFER_UPTODATE, &eb->bflags); |
0b32f4bb | 4944 | num_pages = num_extent_pages(eb->start, eb->len); |
1259ab75 CM |
4945 | for (i = 0; i < num_pages; i++) { |
4946 | page = extent_buffer_page(eb, i); | |
33958dc6 CM |
4947 | if (page) |
4948 | ClearPageUptodate(page); | |
1259ab75 CM |
4949 | } |
4950 | return 0; | |
4951 | } | |
4952 | ||
0b32f4bb | 4953 | int set_extent_buffer_uptodate(struct extent_buffer *eb) |
d1310b2e CM |
4954 | { |
4955 | unsigned long i; | |
4956 | struct page *page; | |
4957 | unsigned long num_pages; | |
4958 | ||
0b32f4bb | 4959 | set_bit(EXTENT_BUFFER_UPTODATE, &eb->bflags); |
d1310b2e | 4960 | num_pages = num_extent_pages(eb->start, eb->len); |
d1310b2e CM |
4961 | for (i = 0; i < num_pages; i++) { |
4962 | page = extent_buffer_page(eb, i); | |
d1310b2e CM |
4963 | SetPageUptodate(page); |
4964 | } | |
4965 | return 0; | |
4966 | } | |
d1310b2e | 4967 | |
0b32f4bb | 4968 | int extent_buffer_uptodate(struct extent_buffer *eb) |
d1310b2e | 4969 | { |
0b32f4bb | 4970 | return test_bit(EXTENT_BUFFER_UPTODATE, &eb->bflags); |
d1310b2e | 4971 | } |
d1310b2e CM |
4972 | |
4973 | int read_extent_buffer_pages(struct extent_io_tree *tree, | |
bb82ab88 | 4974 | struct extent_buffer *eb, u64 start, int wait, |
f188591e | 4975 | get_extent_t *get_extent, int mirror_num) |
d1310b2e CM |
4976 | { |
4977 | unsigned long i; | |
4978 | unsigned long start_i; | |
4979 | struct page *page; | |
4980 | int err; | |
4981 | int ret = 0; | |
ce9adaa5 CM |
4982 | int locked_pages = 0; |
4983 | int all_uptodate = 1; | |
d1310b2e | 4984 | unsigned long num_pages; |
727011e0 | 4985 | unsigned long num_reads = 0; |
a86c12c7 | 4986 | struct bio *bio = NULL; |
c8b97818 | 4987 | unsigned long bio_flags = 0; |
a86c12c7 | 4988 | |
b4ce94de | 4989 | if (test_bit(EXTENT_BUFFER_UPTODATE, &eb->bflags)) |
d1310b2e CM |
4990 | return 0; |
4991 | ||
d1310b2e CM |
4992 | if (start) { |
4993 | WARN_ON(start < eb->start); | |
4994 | start_i = (start >> PAGE_CACHE_SHIFT) - | |
4995 | (eb->start >> PAGE_CACHE_SHIFT); | |
4996 | } else { | |
4997 | start_i = 0; | |
4998 | } | |
4999 | ||
5000 | num_pages = num_extent_pages(eb->start, eb->len); | |
5001 | for (i = start_i; i < num_pages; i++) { | |
5002 | page = extent_buffer_page(eb, i); | |
bb82ab88 | 5003 | if (wait == WAIT_NONE) { |
2db04966 | 5004 | if (!trylock_page(page)) |
ce9adaa5 | 5005 | goto unlock_exit; |
d1310b2e CM |
5006 | } else { |
5007 | lock_page(page); | |
5008 | } | |
ce9adaa5 | 5009 | locked_pages++; |
727011e0 CM |
5010 | if (!PageUptodate(page)) { |
5011 | num_reads++; | |
ce9adaa5 | 5012 | all_uptodate = 0; |
727011e0 | 5013 | } |
ce9adaa5 CM |
5014 | } |
5015 | if (all_uptodate) { | |
5016 | if (start_i == 0) | |
b4ce94de | 5017 | set_bit(EXTENT_BUFFER_UPTODATE, &eb->bflags); |
ce9adaa5 CM |
5018 | goto unlock_exit; |
5019 | } | |
5020 | ||
ea466794 | 5021 | clear_bit(EXTENT_BUFFER_IOERR, &eb->bflags); |
5cf1ab56 | 5022 | eb->read_mirror = 0; |
0b32f4bb | 5023 | atomic_set(&eb->io_pages, num_reads); |
ce9adaa5 CM |
5024 | for (i = start_i; i < num_pages; i++) { |
5025 | page = extent_buffer_page(eb, i); | |
ce9adaa5 | 5026 | if (!PageUptodate(page)) { |
f188591e | 5027 | ClearPageError(page); |
a86c12c7 | 5028 | err = __extent_read_full_page(tree, page, |
f188591e | 5029 | get_extent, &bio, |
d4c7ca86 JB |
5030 | mirror_num, &bio_flags, |
5031 | READ | REQ_META); | |
d397712b | 5032 | if (err) |
d1310b2e | 5033 | ret = err; |
d1310b2e CM |
5034 | } else { |
5035 | unlock_page(page); | |
5036 | } | |
5037 | } | |
5038 | ||
355808c2 | 5039 | if (bio) { |
d4c7ca86 JB |
5040 | err = submit_one_bio(READ | REQ_META, bio, mirror_num, |
5041 | bio_flags); | |
79787eaa JM |
5042 | if (err) |
5043 | return err; | |
355808c2 | 5044 | } |
a86c12c7 | 5045 | |
bb82ab88 | 5046 | if (ret || wait != WAIT_COMPLETE) |
d1310b2e | 5047 | return ret; |
d397712b | 5048 | |
d1310b2e CM |
5049 | for (i = start_i; i < num_pages; i++) { |
5050 | page = extent_buffer_page(eb, i); | |
5051 | wait_on_page_locked(page); | |
d397712b | 5052 | if (!PageUptodate(page)) |
d1310b2e | 5053 | ret = -EIO; |
d1310b2e | 5054 | } |
d397712b | 5055 | |
d1310b2e | 5056 | return ret; |
ce9adaa5 CM |
5057 | |
5058 | unlock_exit: | |
5059 | i = start_i; | |
d397712b | 5060 | while (locked_pages > 0) { |
ce9adaa5 CM |
5061 | page = extent_buffer_page(eb, i); |
5062 | i++; | |
5063 | unlock_page(page); | |
5064 | locked_pages--; | |
5065 | } | |
5066 | return ret; | |
d1310b2e | 5067 | } |
d1310b2e CM |
5068 | |
5069 | void read_extent_buffer(struct extent_buffer *eb, void *dstv, | |
5070 | unsigned long start, | |
5071 | unsigned long len) | |
5072 | { | |
5073 | size_t cur; | |
5074 | size_t offset; | |
5075 | struct page *page; | |
5076 | char *kaddr; | |
5077 | char *dst = (char *)dstv; | |
5078 | size_t start_offset = eb->start & ((u64)PAGE_CACHE_SIZE - 1); | |
5079 | unsigned long i = (start_offset + start) >> PAGE_CACHE_SHIFT; | |
d1310b2e CM |
5080 | |
5081 | WARN_ON(start > eb->len); | |
5082 | WARN_ON(start + len > eb->start + eb->len); | |
5083 | ||
778746b5 | 5084 | offset = (start_offset + start) & (PAGE_CACHE_SIZE - 1); |
d1310b2e | 5085 | |
d397712b | 5086 | while (len > 0) { |
d1310b2e | 5087 | page = extent_buffer_page(eb, i); |
d1310b2e CM |
5088 | |
5089 | cur = min(len, (PAGE_CACHE_SIZE - offset)); | |
a6591715 | 5090 | kaddr = page_address(page); |
d1310b2e | 5091 | memcpy(dst, kaddr + offset, cur); |
d1310b2e CM |
5092 | |
5093 | dst += cur; | |
5094 | len -= cur; | |
5095 | offset = 0; | |
5096 | i++; | |
5097 | } | |
5098 | } | |
d1310b2e | 5099 | |
550ac1d8 GH |
5100 | int read_extent_buffer_to_user(struct extent_buffer *eb, void __user *dstv, |
5101 | unsigned long start, | |
5102 | unsigned long len) | |
5103 | { | |
5104 | size_t cur; | |
5105 | size_t offset; | |
5106 | struct page *page; | |
5107 | char *kaddr; | |
5108 | char __user *dst = (char __user *)dstv; | |
5109 | size_t start_offset = eb->start & ((u64)PAGE_CACHE_SIZE - 1); | |
5110 | unsigned long i = (start_offset + start) >> PAGE_CACHE_SHIFT; | |
5111 | int ret = 0; | |
5112 | ||
5113 | WARN_ON(start > eb->len); | |
5114 | WARN_ON(start + len > eb->start + eb->len); | |
5115 | ||
5116 | offset = (start_offset + start) & (PAGE_CACHE_SIZE - 1); | |
5117 | ||
5118 | while (len > 0) { | |
5119 | page = extent_buffer_page(eb, i); | |
5120 | ||
5121 | cur = min(len, (PAGE_CACHE_SIZE - offset)); | |
5122 | kaddr = page_address(page); | |
5123 | if (copy_to_user(dst, kaddr + offset, cur)) { | |
5124 | ret = -EFAULT; | |
5125 | break; | |
5126 | } | |
5127 | ||
5128 | dst += cur; | |
5129 | len -= cur; | |
5130 | offset = 0; | |
5131 | i++; | |
5132 | } | |
5133 | ||
5134 | return ret; | |
5135 | } | |
5136 | ||
d1310b2e | 5137 | int map_private_extent_buffer(struct extent_buffer *eb, unsigned long start, |
a6591715 | 5138 | unsigned long min_len, char **map, |
d1310b2e | 5139 | unsigned long *map_start, |
a6591715 | 5140 | unsigned long *map_len) |
d1310b2e CM |
5141 | { |
5142 | size_t offset = start & (PAGE_CACHE_SIZE - 1); | |
5143 | char *kaddr; | |
5144 | struct page *p; | |
5145 | size_t start_offset = eb->start & ((u64)PAGE_CACHE_SIZE - 1); | |
5146 | unsigned long i = (start_offset + start) >> PAGE_CACHE_SHIFT; | |
5147 | unsigned long end_i = (start_offset + start + min_len - 1) >> | |
5148 | PAGE_CACHE_SHIFT; | |
5149 | ||
5150 | if (i != end_i) | |
5151 | return -EINVAL; | |
5152 | ||
5153 | if (i == 0) { | |
5154 | offset = start_offset; | |
5155 | *map_start = 0; | |
5156 | } else { | |
5157 | offset = 0; | |
5158 | *map_start = ((u64)i << PAGE_CACHE_SHIFT) - start_offset; | |
5159 | } | |
d397712b | 5160 | |
d1310b2e | 5161 | if (start + min_len > eb->len) { |
31b1a2bd | 5162 | WARN(1, KERN_ERR "btrfs bad mapping eb start %llu len %lu, " |
c1c9ff7c GU |
5163 | "wanted %lu %lu\n", |
5164 | eb->start, eb->len, start, min_len); | |
85026533 | 5165 | return -EINVAL; |
d1310b2e CM |
5166 | } |
5167 | ||
5168 | p = extent_buffer_page(eb, i); | |
a6591715 | 5169 | kaddr = page_address(p); |
d1310b2e CM |
5170 | *map = kaddr + offset; |
5171 | *map_len = PAGE_CACHE_SIZE - offset; | |
5172 | return 0; | |
5173 | } | |
d1310b2e | 5174 | |
d1310b2e CM |
5175 | int memcmp_extent_buffer(struct extent_buffer *eb, const void *ptrv, |
5176 | unsigned long start, | |
5177 | unsigned long len) | |
5178 | { | |
5179 | size_t cur; | |
5180 | size_t offset; | |
5181 | struct page *page; | |
5182 | char *kaddr; | |
5183 | char *ptr = (char *)ptrv; | |
5184 | size_t start_offset = eb->start & ((u64)PAGE_CACHE_SIZE - 1); | |
5185 | unsigned long i = (start_offset + start) >> PAGE_CACHE_SHIFT; | |
5186 | int ret = 0; | |
5187 | ||
5188 | WARN_ON(start > eb->len); | |
5189 | WARN_ON(start + len > eb->start + eb->len); | |
5190 | ||
778746b5 | 5191 | offset = (start_offset + start) & (PAGE_CACHE_SIZE - 1); |
d1310b2e | 5192 | |
d397712b | 5193 | while (len > 0) { |
d1310b2e | 5194 | page = extent_buffer_page(eb, i); |
d1310b2e CM |
5195 | |
5196 | cur = min(len, (PAGE_CACHE_SIZE - offset)); | |
5197 | ||
a6591715 | 5198 | kaddr = page_address(page); |
d1310b2e | 5199 | ret = memcmp(ptr, kaddr + offset, cur); |
d1310b2e CM |
5200 | if (ret) |
5201 | break; | |
5202 | ||
5203 | ptr += cur; | |
5204 | len -= cur; | |
5205 | offset = 0; | |
5206 | i++; | |
5207 | } | |
5208 | return ret; | |
5209 | } | |
d1310b2e CM |
5210 | |
5211 | void write_extent_buffer(struct extent_buffer *eb, const void *srcv, | |
5212 | unsigned long start, unsigned long len) | |
5213 | { | |
5214 | size_t cur; | |
5215 | size_t offset; | |
5216 | struct page *page; | |
5217 | char *kaddr; | |
5218 | char *src = (char *)srcv; | |
5219 | size_t start_offset = eb->start & ((u64)PAGE_CACHE_SIZE - 1); | |
5220 | unsigned long i = (start_offset + start) >> PAGE_CACHE_SHIFT; | |
5221 | ||
5222 | WARN_ON(start > eb->len); | |
5223 | WARN_ON(start + len > eb->start + eb->len); | |
5224 | ||
778746b5 | 5225 | offset = (start_offset + start) & (PAGE_CACHE_SIZE - 1); |
d1310b2e | 5226 | |
d397712b | 5227 | while (len > 0) { |
d1310b2e CM |
5228 | page = extent_buffer_page(eb, i); |
5229 | WARN_ON(!PageUptodate(page)); | |
5230 | ||
5231 | cur = min(len, PAGE_CACHE_SIZE - offset); | |
a6591715 | 5232 | kaddr = page_address(page); |
d1310b2e | 5233 | memcpy(kaddr + offset, src, cur); |
d1310b2e CM |
5234 | |
5235 | src += cur; | |
5236 | len -= cur; | |
5237 | offset = 0; | |
5238 | i++; | |
5239 | } | |
5240 | } | |
d1310b2e CM |
5241 | |
5242 | void memset_extent_buffer(struct extent_buffer *eb, char c, | |
5243 | unsigned long start, unsigned long len) | |
5244 | { | |
5245 | size_t cur; | |
5246 | size_t offset; | |
5247 | struct page *page; | |
5248 | char *kaddr; | |
5249 | size_t start_offset = eb->start & ((u64)PAGE_CACHE_SIZE - 1); | |
5250 | unsigned long i = (start_offset + start) >> PAGE_CACHE_SHIFT; | |
5251 | ||
5252 | WARN_ON(start > eb->len); | |
5253 | WARN_ON(start + len > eb->start + eb->len); | |
5254 | ||
778746b5 | 5255 | offset = (start_offset + start) & (PAGE_CACHE_SIZE - 1); |
d1310b2e | 5256 | |
d397712b | 5257 | while (len > 0) { |
d1310b2e CM |
5258 | page = extent_buffer_page(eb, i); |
5259 | WARN_ON(!PageUptodate(page)); | |
5260 | ||
5261 | cur = min(len, PAGE_CACHE_SIZE - offset); | |
a6591715 | 5262 | kaddr = page_address(page); |
d1310b2e | 5263 | memset(kaddr + offset, c, cur); |
d1310b2e CM |
5264 | |
5265 | len -= cur; | |
5266 | offset = 0; | |
5267 | i++; | |
5268 | } | |
5269 | } | |
d1310b2e CM |
5270 | |
5271 | void copy_extent_buffer(struct extent_buffer *dst, struct extent_buffer *src, | |
5272 | unsigned long dst_offset, unsigned long src_offset, | |
5273 | unsigned long len) | |
5274 | { | |
5275 | u64 dst_len = dst->len; | |
5276 | size_t cur; | |
5277 | size_t offset; | |
5278 | struct page *page; | |
5279 | char *kaddr; | |
5280 | size_t start_offset = dst->start & ((u64)PAGE_CACHE_SIZE - 1); | |
5281 | unsigned long i = (start_offset + dst_offset) >> PAGE_CACHE_SHIFT; | |
5282 | ||
5283 | WARN_ON(src->len != dst_len); | |
5284 | ||
5285 | offset = (start_offset + dst_offset) & | |
778746b5 | 5286 | (PAGE_CACHE_SIZE - 1); |
d1310b2e | 5287 | |
d397712b | 5288 | while (len > 0) { |
d1310b2e CM |
5289 | page = extent_buffer_page(dst, i); |
5290 | WARN_ON(!PageUptodate(page)); | |
5291 | ||
5292 | cur = min(len, (unsigned long)(PAGE_CACHE_SIZE - offset)); | |
5293 | ||
a6591715 | 5294 | kaddr = page_address(page); |
d1310b2e | 5295 | read_extent_buffer(src, kaddr + offset, src_offset, cur); |
d1310b2e CM |
5296 | |
5297 | src_offset += cur; | |
5298 | len -= cur; | |
5299 | offset = 0; | |
5300 | i++; | |
5301 | } | |
5302 | } | |
d1310b2e | 5303 | |
3387206f ST |
5304 | static inline bool areas_overlap(unsigned long src, unsigned long dst, unsigned long len) |
5305 | { | |
5306 | unsigned long distance = (src > dst) ? src - dst : dst - src; | |
5307 | return distance < len; | |
5308 | } | |
5309 | ||
d1310b2e CM |
5310 | static void copy_pages(struct page *dst_page, struct page *src_page, |
5311 | unsigned long dst_off, unsigned long src_off, | |
5312 | unsigned long len) | |
5313 | { | |
a6591715 | 5314 | char *dst_kaddr = page_address(dst_page); |
d1310b2e | 5315 | char *src_kaddr; |
727011e0 | 5316 | int must_memmove = 0; |
d1310b2e | 5317 | |
3387206f | 5318 | if (dst_page != src_page) { |
a6591715 | 5319 | src_kaddr = page_address(src_page); |
3387206f | 5320 | } else { |
d1310b2e | 5321 | src_kaddr = dst_kaddr; |
727011e0 CM |
5322 | if (areas_overlap(src_off, dst_off, len)) |
5323 | must_memmove = 1; | |
3387206f | 5324 | } |
d1310b2e | 5325 | |
727011e0 CM |
5326 | if (must_memmove) |
5327 | memmove(dst_kaddr + dst_off, src_kaddr + src_off, len); | |
5328 | else | |
5329 | memcpy(dst_kaddr + dst_off, src_kaddr + src_off, len); | |
d1310b2e CM |
5330 | } |
5331 | ||
5332 | void memcpy_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset, | |
5333 | unsigned long src_offset, unsigned long len) | |
5334 | { | |
5335 | size_t cur; | |
5336 | size_t dst_off_in_page; | |
5337 | size_t src_off_in_page; | |
5338 | size_t start_offset = dst->start & ((u64)PAGE_CACHE_SIZE - 1); | |
5339 | unsigned long dst_i; | |
5340 | unsigned long src_i; | |
5341 | ||
5342 | if (src_offset + len > dst->len) { | |
efe120a0 | 5343 | printk(KERN_ERR "BTRFS: memmove bogus src_offset %lu move " |
d397712b | 5344 | "len %lu dst len %lu\n", src_offset, len, dst->len); |
d1310b2e CM |
5345 | BUG_ON(1); |
5346 | } | |
5347 | if (dst_offset + len > dst->len) { | |
efe120a0 | 5348 | printk(KERN_ERR "BTRFS: memmove bogus dst_offset %lu move " |
d397712b | 5349 | "len %lu dst len %lu\n", dst_offset, len, dst->len); |
d1310b2e CM |
5350 | BUG_ON(1); |
5351 | } | |
5352 | ||
d397712b | 5353 | while (len > 0) { |
d1310b2e | 5354 | dst_off_in_page = (start_offset + dst_offset) & |
778746b5 | 5355 | (PAGE_CACHE_SIZE - 1); |
d1310b2e | 5356 | src_off_in_page = (start_offset + src_offset) & |
778746b5 | 5357 | (PAGE_CACHE_SIZE - 1); |
d1310b2e CM |
5358 | |
5359 | dst_i = (start_offset + dst_offset) >> PAGE_CACHE_SHIFT; | |
5360 | src_i = (start_offset + src_offset) >> PAGE_CACHE_SHIFT; | |
5361 | ||
5362 | cur = min(len, (unsigned long)(PAGE_CACHE_SIZE - | |
5363 | src_off_in_page)); | |
5364 | cur = min_t(unsigned long, cur, | |
5365 | (unsigned long)(PAGE_CACHE_SIZE - dst_off_in_page)); | |
5366 | ||
5367 | copy_pages(extent_buffer_page(dst, dst_i), | |
5368 | extent_buffer_page(dst, src_i), | |
5369 | dst_off_in_page, src_off_in_page, cur); | |
5370 | ||
5371 | src_offset += cur; | |
5372 | dst_offset += cur; | |
5373 | len -= cur; | |
5374 | } | |
5375 | } | |
d1310b2e CM |
5376 | |
5377 | void memmove_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset, | |
5378 | unsigned long src_offset, unsigned long len) | |
5379 | { | |
5380 | size_t cur; | |
5381 | size_t dst_off_in_page; | |
5382 | size_t src_off_in_page; | |
5383 | unsigned long dst_end = dst_offset + len - 1; | |
5384 | unsigned long src_end = src_offset + len - 1; | |
5385 | size_t start_offset = dst->start & ((u64)PAGE_CACHE_SIZE - 1); | |
5386 | unsigned long dst_i; | |
5387 | unsigned long src_i; | |
5388 | ||
5389 | if (src_offset + len > dst->len) { | |
efe120a0 | 5390 | printk(KERN_ERR "BTRFS: memmove bogus src_offset %lu move " |
d397712b | 5391 | "len %lu len %lu\n", src_offset, len, dst->len); |
d1310b2e CM |
5392 | BUG_ON(1); |
5393 | } | |
5394 | if (dst_offset + len > dst->len) { | |
efe120a0 | 5395 | printk(KERN_ERR "BTRFS: memmove bogus dst_offset %lu move " |
d397712b | 5396 | "len %lu len %lu\n", dst_offset, len, dst->len); |
d1310b2e CM |
5397 | BUG_ON(1); |
5398 | } | |
727011e0 | 5399 | if (dst_offset < src_offset) { |
d1310b2e CM |
5400 | memcpy_extent_buffer(dst, dst_offset, src_offset, len); |
5401 | return; | |
5402 | } | |
d397712b | 5403 | while (len > 0) { |
d1310b2e CM |
5404 | dst_i = (start_offset + dst_end) >> PAGE_CACHE_SHIFT; |
5405 | src_i = (start_offset + src_end) >> PAGE_CACHE_SHIFT; | |
5406 | ||
5407 | dst_off_in_page = (start_offset + dst_end) & | |
778746b5 | 5408 | (PAGE_CACHE_SIZE - 1); |
d1310b2e | 5409 | src_off_in_page = (start_offset + src_end) & |
778746b5 | 5410 | (PAGE_CACHE_SIZE - 1); |
d1310b2e CM |
5411 | |
5412 | cur = min_t(unsigned long, len, src_off_in_page + 1); | |
5413 | cur = min(cur, dst_off_in_page + 1); | |
1877e1a7 | 5414 | copy_pages(extent_buffer_page(dst, dst_i), |
d1310b2e CM |
5415 | extent_buffer_page(dst, src_i), |
5416 | dst_off_in_page - cur + 1, | |
5417 | src_off_in_page - cur + 1, cur); | |
5418 | ||
5419 | dst_end -= cur; | |
5420 | src_end -= cur; | |
5421 | len -= cur; | |
5422 | } | |
5423 | } | |
6af118ce | 5424 | |
f7a52a40 | 5425 | int try_release_extent_buffer(struct page *page) |
19fe0a8b | 5426 | { |
6af118ce | 5427 | struct extent_buffer *eb; |
6af118ce | 5428 | |
3083ee2e JB |
5429 | /* |
5430 | * We need to make sure noboody is attaching this page to an eb right | |
5431 | * now. | |
5432 | */ | |
5433 | spin_lock(&page->mapping->private_lock); | |
5434 | if (!PagePrivate(page)) { | |
5435 | spin_unlock(&page->mapping->private_lock); | |
4f2de97a | 5436 | return 1; |
45f49bce | 5437 | } |
6af118ce | 5438 | |
3083ee2e JB |
5439 | eb = (struct extent_buffer *)page->private; |
5440 | BUG_ON(!eb); | |
19fe0a8b MX |
5441 | |
5442 | /* | |
3083ee2e JB |
5443 | * This is a little awful but should be ok, we need to make sure that |
5444 | * the eb doesn't disappear out from under us while we're looking at | |
5445 | * this page. | |
19fe0a8b | 5446 | */ |
3083ee2e | 5447 | spin_lock(&eb->refs_lock); |
0b32f4bb | 5448 | if (atomic_read(&eb->refs) != 1 || extent_buffer_under_io(eb)) { |
3083ee2e JB |
5449 | spin_unlock(&eb->refs_lock); |
5450 | spin_unlock(&page->mapping->private_lock); | |
5451 | return 0; | |
b9473439 | 5452 | } |
3083ee2e | 5453 | spin_unlock(&page->mapping->private_lock); |
897ca6e9 | 5454 | |
19fe0a8b | 5455 | /* |
3083ee2e JB |
5456 | * If tree ref isn't set then we know the ref on this eb is a real ref, |
5457 | * so just return, this page will likely be freed soon anyway. | |
19fe0a8b | 5458 | */ |
3083ee2e JB |
5459 | if (!test_and_clear_bit(EXTENT_BUFFER_TREE_REF, &eb->bflags)) { |
5460 | spin_unlock(&eb->refs_lock); | |
5461 | return 0; | |
b9473439 | 5462 | } |
19fe0a8b | 5463 | |
f7a52a40 | 5464 | return release_extent_buffer(eb); |
6af118ce | 5465 | } |