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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> | |
7 | #include <linux/module.h> | |
8 | #include <linux/spinlock.h> | |
9 | #include <linux/blkdev.h> | |
10 | #include <linux/swap.h> | |
d1310b2e CM |
11 | #include <linux/writeback.h> |
12 | #include <linux/pagevec.h> | |
268bb0ce | 13 | #include <linux/prefetch.h> |
90a887c9 | 14 | #include <linux/cleancache.h> |
d1310b2e CM |
15 | #include "extent_io.h" |
16 | #include "extent_map.h" | |
2db04966 | 17 | #include "compat.h" |
902b22f3 DW |
18 | #include "ctree.h" |
19 | #include "btrfs_inode.h" | |
4a54c8c1 | 20 | #include "volumes.h" |
21adbd5c | 21 | #include "check-integrity.h" |
0b32f4bb | 22 | #include "locking.h" |
d1310b2e | 23 | |
d1310b2e CM |
24 | static struct kmem_cache *extent_state_cache; |
25 | static struct kmem_cache *extent_buffer_cache; | |
26 | ||
27 | static LIST_HEAD(buffers); | |
28 | static LIST_HEAD(states); | |
4bef0848 | 29 | |
b47eda86 | 30 | #define LEAK_DEBUG 0 |
3935127c | 31 | #if LEAK_DEBUG |
d397712b | 32 | static DEFINE_SPINLOCK(leak_lock); |
4bef0848 | 33 | #endif |
d1310b2e | 34 | |
d1310b2e CM |
35 | #define BUFFER_LRU_MAX 64 |
36 | ||
37 | struct tree_entry { | |
38 | u64 start; | |
39 | u64 end; | |
d1310b2e CM |
40 | struct rb_node rb_node; |
41 | }; | |
42 | ||
43 | struct extent_page_data { | |
44 | struct bio *bio; | |
45 | struct extent_io_tree *tree; | |
46 | get_extent_t *get_extent; | |
771ed689 CM |
47 | |
48 | /* tells writepage not to lock the state bits for this range | |
49 | * it still does the unlocking | |
50 | */ | |
ffbd517d CM |
51 | unsigned int extent_locked:1; |
52 | ||
53 | /* tells the submit_bio code to use a WRITE_SYNC */ | |
54 | unsigned int sync_io:1; | |
d1310b2e CM |
55 | }; |
56 | ||
0b32f4bb JB |
57 | static noinline void flush_write_bio(void *data); |
58 | ||
d1310b2e CM |
59 | int __init extent_io_init(void) |
60 | { | |
9601e3f6 CH |
61 | extent_state_cache = kmem_cache_create("extent_state", |
62 | sizeof(struct extent_state), 0, | |
63 | SLAB_RECLAIM_ACCOUNT | SLAB_MEM_SPREAD, NULL); | |
d1310b2e CM |
64 | if (!extent_state_cache) |
65 | return -ENOMEM; | |
66 | ||
9601e3f6 CH |
67 | extent_buffer_cache = kmem_cache_create("extent_buffers", |
68 | sizeof(struct extent_buffer), 0, | |
69 | SLAB_RECLAIM_ACCOUNT | SLAB_MEM_SPREAD, NULL); | |
d1310b2e CM |
70 | if (!extent_buffer_cache) |
71 | goto free_state_cache; | |
72 | return 0; | |
73 | ||
74 | free_state_cache: | |
75 | kmem_cache_destroy(extent_state_cache); | |
76 | return -ENOMEM; | |
77 | } | |
78 | ||
79 | void extent_io_exit(void) | |
80 | { | |
81 | struct extent_state *state; | |
2d2ae547 | 82 | struct extent_buffer *eb; |
d1310b2e CM |
83 | |
84 | while (!list_empty(&states)) { | |
2d2ae547 | 85 | state = list_entry(states.next, struct extent_state, leak_list); |
d397712b CM |
86 | printk(KERN_ERR "btrfs state leak: start %llu end %llu " |
87 | "state %lu in tree %p refs %d\n", | |
88 | (unsigned long long)state->start, | |
89 | (unsigned long long)state->end, | |
90 | state->state, state->tree, atomic_read(&state->refs)); | |
2d2ae547 | 91 | list_del(&state->leak_list); |
d1310b2e CM |
92 | kmem_cache_free(extent_state_cache, state); |
93 | ||
94 | } | |
95 | ||
2d2ae547 CM |
96 | while (!list_empty(&buffers)) { |
97 | eb = list_entry(buffers.next, struct extent_buffer, leak_list); | |
d397712b CM |
98 | printk(KERN_ERR "btrfs buffer leak start %llu len %lu " |
99 | "refs %d\n", (unsigned long long)eb->start, | |
100 | eb->len, atomic_read(&eb->refs)); | |
2d2ae547 CM |
101 | list_del(&eb->leak_list); |
102 | kmem_cache_free(extent_buffer_cache, eb); | |
103 | } | |
d1310b2e CM |
104 | if (extent_state_cache) |
105 | kmem_cache_destroy(extent_state_cache); | |
106 | if (extent_buffer_cache) | |
107 | kmem_cache_destroy(extent_buffer_cache); | |
108 | } | |
109 | ||
110 | void extent_io_tree_init(struct extent_io_tree *tree, | |
f993c883 | 111 | struct address_space *mapping) |
d1310b2e | 112 | { |
6bef4d31 | 113 | tree->state = RB_ROOT; |
19fe0a8b | 114 | INIT_RADIX_TREE(&tree->buffer, GFP_ATOMIC); |
d1310b2e CM |
115 | tree->ops = NULL; |
116 | tree->dirty_bytes = 0; | |
70dec807 | 117 | spin_lock_init(&tree->lock); |
6af118ce | 118 | spin_lock_init(&tree->buffer_lock); |
d1310b2e | 119 | tree->mapping = mapping; |
d1310b2e | 120 | } |
d1310b2e | 121 | |
b2950863 | 122 | static struct extent_state *alloc_extent_state(gfp_t mask) |
d1310b2e CM |
123 | { |
124 | struct extent_state *state; | |
3935127c | 125 | #if LEAK_DEBUG |
2d2ae547 | 126 | unsigned long flags; |
4bef0848 | 127 | #endif |
d1310b2e CM |
128 | |
129 | state = kmem_cache_alloc(extent_state_cache, mask); | |
2b114d1d | 130 | if (!state) |
d1310b2e CM |
131 | return state; |
132 | state->state = 0; | |
d1310b2e | 133 | state->private = 0; |
70dec807 | 134 | state->tree = NULL; |
3935127c | 135 | #if LEAK_DEBUG |
2d2ae547 CM |
136 | spin_lock_irqsave(&leak_lock, flags); |
137 | list_add(&state->leak_list, &states); | |
138 | spin_unlock_irqrestore(&leak_lock, flags); | |
4bef0848 | 139 | #endif |
d1310b2e CM |
140 | atomic_set(&state->refs, 1); |
141 | init_waitqueue_head(&state->wq); | |
142 | return state; | |
143 | } | |
d1310b2e | 144 | |
4845e44f | 145 | void free_extent_state(struct extent_state *state) |
d1310b2e | 146 | { |
d1310b2e CM |
147 | if (!state) |
148 | return; | |
149 | if (atomic_dec_and_test(&state->refs)) { | |
3935127c | 150 | #if LEAK_DEBUG |
2d2ae547 | 151 | unsigned long flags; |
4bef0848 | 152 | #endif |
70dec807 | 153 | WARN_ON(state->tree); |
3935127c | 154 | #if LEAK_DEBUG |
2d2ae547 CM |
155 | spin_lock_irqsave(&leak_lock, flags); |
156 | list_del(&state->leak_list); | |
157 | spin_unlock_irqrestore(&leak_lock, flags); | |
4bef0848 | 158 | #endif |
d1310b2e CM |
159 | kmem_cache_free(extent_state_cache, state); |
160 | } | |
161 | } | |
d1310b2e CM |
162 | |
163 | static struct rb_node *tree_insert(struct rb_root *root, u64 offset, | |
164 | struct rb_node *node) | |
165 | { | |
d397712b CM |
166 | struct rb_node **p = &root->rb_node; |
167 | struct rb_node *parent = NULL; | |
d1310b2e CM |
168 | struct tree_entry *entry; |
169 | ||
d397712b | 170 | while (*p) { |
d1310b2e CM |
171 | parent = *p; |
172 | entry = rb_entry(parent, struct tree_entry, rb_node); | |
173 | ||
174 | if (offset < entry->start) | |
175 | p = &(*p)->rb_left; | |
176 | else if (offset > entry->end) | |
177 | p = &(*p)->rb_right; | |
178 | else | |
179 | return parent; | |
180 | } | |
181 | ||
182 | entry = rb_entry(node, struct tree_entry, rb_node); | |
d1310b2e CM |
183 | rb_link_node(node, parent, p); |
184 | rb_insert_color(node, root); | |
185 | return NULL; | |
186 | } | |
187 | ||
80ea96b1 | 188 | static struct rb_node *__etree_search(struct extent_io_tree *tree, u64 offset, |
d1310b2e CM |
189 | struct rb_node **prev_ret, |
190 | struct rb_node **next_ret) | |
191 | { | |
80ea96b1 | 192 | struct rb_root *root = &tree->state; |
d397712b | 193 | struct rb_node *n = root->rb_node; |
d1310b2e CM |
194 | struct rb_node *prev = NULL; |
195 | struct rb_node *orig_prev = NULL; | |
196 | struct tree_entry *entry; | |
197 | struct tree_entry *prev_entry = NULL; | |
198 | ||
d397712b | 199 | while (n) { |
d1310b2e CM |
200 | entry = rb_entry(n, struct tree_entry, rb_node); |
201 | prev = n; | |
202 | prev_entry = entry; | |
203 | ||
204 | if (offset < entry->start) | |
205 | n = n->rb_left; | |
206 | else if (offset > entry->end) | |
207 | n = n->rb_right; | |
d397712b | 208 | else |
d1310b2e CM |
209 | return n; |
210 | } | |
211 | ||
212 | if (prev_ret) { | |
213 | orig_prev = prev; | |
d397712b | 214 | while (prev && offset > prev_entry->end) { |
d1310b2e CM |
215 | prev = rb_next(prev); |
216 | prev_entry = rb_entry(prev, struct tree_entry, rb_node); | |
217 | } | |
218 | *prev_ret = prev; | |
219 | prev = orig_prev; | |
220 | } | |
221 | ||
222 | if (next_ret) { | |
223 | prev_entry = rb_entry(prev, struct tree_entry, rb_node); | |
d397712b | 224 | while (prev && offset < prev_entry->start) { |
d1310b2e CM |
225 | prev = rb_prev(prev); |
226 | prev_entry = rb_entry(prev, struct tree_entry, rb_node); | |
227 | } | |
228 | *next_ret = prev; | |
229 | } | |
230 | return NULL; | |
231 | } | |
232 | ||
80ea96b1 CM |
233 | static inline struct rb_node *tree_search(struct extent_io_tree *tree, |
234 | u64 offset) | |
d1310b2e | 235 | { |
70dec807 | 236 | struct rb_node *prev = NULL; |
d1310b2e | 237 | struct rb_node *ret; |
70dec807 | 238 | |
80ea96b1 | 239 | ret = __etree_search(tree, offset, &prev, NULL); |
d397712b | 240 | if (!ret) |
d1310b2e CM |
241 | return prev; |
242 | return ret; | |
243 | } | |
244 | ||
9ed74f2d JB |
245 | static void merge_cb(struct extent_io_tree *tree, struct extent_state *new, |
246 | struct extent_state *other) | |
247 | { | |
248 | if (tree->ops && tree->ops->merge_extent_hook) | |
249 | tree->ops->merge_extent_hook(tree->mapping->host, new, | |
250 | other); | |
251 | } | |
252 | ||
d1310b2e CM |
253 | /* |
254 | * utility function to look for merge candidates inside a given range. | |
255 | * Any extents with matching state are merged together into a single | |
256 | * extent in the tree. Extents with EXTENT_IO in their state field | |
257 | * are not merged because the end_io handlers need to be able to do | |
258 | * operations on them without sleeping (or doing allocations/splits). | |
259 | * | |
260 | * This should be called with the tree lock held. | |
261 | */ | |
1bf85046 JM |
262 | static void merge_state(struct extent_io_tree *tree, |
263 | struct extent_state *state) | |
d1310b2e CM |
264 | { |
265 | struct extent_state *other; | |
266 | struct rb_node *other_node; | |
267 | ||
5b21f2ed | 268 | if (state->state & (EXTENT_IOBITS | EXTENT_BOUNDARY)) |
1bf85046 | 269 | return; |
d1310b2e CM |
270 | |
271 | other_node = rb_prev(&state->rb_node); | |
272 | if (other_node) { | |
273 | other = rb_entry(other_node, struct extent_state, rb_node); | |
274 | if (other->end == state->start - 1 && | |
275 | other->state == state->state) { | |
9ed74f2d | 276 | merge_cb(tree, state, other); |
d1310b2e | 277 | state->start = other->start; |
70dec807 | 278 | other->tree = NULL; |
d1310b2e CM |
279 | rb_erase(&other->rb_node, &tree->state); |
280 | free_extent_state(other); | |
281 | } | |
282 | } | |
283 | other_node = rb_next(&state->rb_node); | |
284 | if (other_node) { | |
285 | other = rb_entry(other_node, struct extent_state, rb_node); | |
286 | if (other->start == state->end + 1 && | |
287 | other->state == state->state) { | |
9ed74f2d | 288 | merge_cb(tree, state, other); |
df98b6e2 JB |
289 | state->end = other->end; |
290 | other->tree = NULL; | |
291 | rb_erase(&other->rb_node, &tree->state); | |
292 | free_extent_state(other); | |
d1310b2e CM |
293 | } |
294 | } | |
d1310b2e CM |
295 | } |
296 | ||
1bf85046 | 297 | static void set_state_cb(struct extent_io_tree *tree, |
0ca1f7ce | 298 | struct extent_state *state, int *bits) |
291d673e | 299 | { |
1bf85046 JM |
300 | if (tree->ops && tree->ops->set_bit_hook) |
301 | tree->ops->set_bit_hook(tree->mapping->host, state, bits); | |
291d673e CM |
302 | } |
303 | ||
304 | static void clear_state_cb(struct extent_io_tree *tree, | |
0ca1f7ce | 305 | struct extent_state *state, int *bits) |
291d673e | 306 | { |
9ed74f2d JB |
307 | if (tree->ops && tree->ops->clear_bit_hook) |
308 | tree->ops->clear_bit_hook(tree->mapping->host, state, bits); | |
291d673e CM |
309 | } |
310 | ||
3150b699 XG |
311 | static void set_state_bits(struct extent_io_tree *tree, |
312 | struct extent_state *state, int *bits); | |
313 | ||
d1310b2e CM |
314 | /* |
315 | * insert an extent_state struct into the tree. 'bits' are set on the | |
316 | * struct before it is inserted. | |
317 | * | |
318 | * This may return -EEXIST if the extent is already there, in which case the | |
319 | * state struct is freed. | |
320 | * | |
321 | * The tree lock is not taken internally. This is a utility function and | |
322 | * probably isn't what you want to call (see set/clear_extent_bit). | |
323 | */ | |
324 | static int insert_state(struct extent_io_tree *tree, | |
325 | struct extent_state *state, u64 start, u64 end, | |
0ca1f7ce | 326 | int *bits) |
d1310b2e CM |
327 | { |
328 | struct rb_node *node; | |
329 | ||
330 | if (end < start) { | |
d397712b CM |
331 | printk(KERN_ERR "btrfs end < start %llu %llu\n", |
332 | (unsigned long long)end, | |
333 | (unsigned long long)start); | |
d1310b2e CM |
334 | WARN_ON(1); |
335 | } | |
d1310b2e CM |
336 | state->start = start; |
337 | state->end = end; | |
9ed74f2d | 338 | |
3150b699 XG |
339 | set_state_bits(tree, state, bits); |
340 | ||
d1310b2e CM |
341 | node = tree_insert(&tree->state, end, &state->rb_node); |
342 | if (node) { | |
343 | struct extent_state *found; | |
344 | found = rb_entry(node, struct extent_state, rb_node); | |
d397712b CM |
345 | printk(KERN_ERR "btrfs found node %llu %llu on insert of " |
346 | "%llu %llu\n", (unsigned long long)found->start, | |
347 | (unsigned long long)found->end, | |
348 | (unsigned long long)start, (unsigned long long)end); | |
d1310b2e CM |
349 | return -EEXIST; |
350 | } | |
70dec807 | 351 | state->tree = tree; |
d1310b2e CM |
352 | merge_state(tree, state); |
353 | return 0; | |
354 | } | |
355 | ||
1bf85046 | 356 | static void split_cb(struct extent_io_tree *tree, struct extent_state *orig, |
9ed74f2d JB |
357 | u64 split) |
358 | { | |
359 | if (tree->ops && tree->ops->split_extent_hook) | |
1bf85046 | 360 | tree->ops->split_extent_hook(tree->mapping->host, orig, split); |
9ed74f2d JB |
361 | } |
362 | ||
d1310b2e CM |
363 | /* |
364 | * split a given extent state struct in two, inserting the preallocated | |
365 | * struct 'prealloc' as the newly created second half. 'split' indicates an | |
366 | * offset inside 'orig' where it should be split. | |
367 | * | |
368 | * Before calling, | |
369 | * the tree has 'orig' at [orig->start, orig->end]. After calling, there | |
370 | * are two extent state structs in the tree: | |
371 | * prealloc: [orig->start, split - 1] | |
372 | * orig: [ split, orig->end ] | |
373 | * | |
374 | * The tree locks are not taken by this function. They need to be held | |
375 | * by the caller. | |
376 | */ | |
377 | static int split_state(struct extent_io_tree *tree, struct extent_state *orig, | |
378 | struct extent_state *prealloc, u64 split) | |
379 | { | |
380 | struct rb_node *node; | |
9ed74f2d JB |
381 | |
382 | split_cb(tree, orig, split); | |
383 | ||
d1310b2e CM |
384 | prealloc->start = orig->start; |
385 | prealloc->end = split - 1; | |
386 | prealloc->state = orig->state; | |
387 | orig->start = split; | |
388 | ||
389 | node = tree_insert(&tree->state, prealloc->end, &prealloc->rb_node); | |
390 | if (node) { | |
d1310b2e CM |
391 | free_extent_state(prealloc); |
392 | return -EEXIST; | |
393 | } | |
70dec807 | 394 | prealloc->tree = tree; |
d1310b2e CM |
395 | return 0; |
396 | } | |
397 | ||
398 | /* | |
399 | * utility function to clear some bits in an extent state struct. | |
400 | * it will optionally wake up any one waiting on this state (wake == 1), or | |
401 | * forcibly remove the state from the tree (delete == 1). | |
402 | * | |
403 | * If no bits are set on the state struct after clearing things, the | |
404 | * struct is freed and removed from the tree | |
405 | */ | |
406 | static int clear_state_bit(struct extent_io_tree *tree, | |
0ca1f7ce YZ |
407 | struct extent_state *state, |
408 | int *bits, int wake) | |
d1310b2e | 409 | { |
0ca1f7ce | 410 | int bits_to_clear = *bits & ~EXTENT_CTLBITS; |
32c00aff | 411 | int ret = state->state & bits_to_clear; |
d1310b2e | 412 | |
0ca1f7ce | 413 | if ((bits_to_clear & EXTENT_DIRTY) && (state->state & EXTENT_DIRTY)) { |
d1310b2e CM |
414 | u64 range = state->end - state->start + 1; |
415 | WARN_ON(range > tree->dirty_bytes); | |
416 | tree->dirty_bytes -= range; | |
417 | } | |
291d673e | 418 | clear_state_cb(tree, state, bits); |
32c00aff | 419 | state->state &= ~bits_to_clear; |
d1310b2e CM |
420 | if (wake) |
421 | wake_up(&state->wq); | |
0ca1f7ce | 422 | if (state->state == 0) { |
70dec807 | 423 | if (state->tree) { |
d1310b2e | 424 | rb_erase(&state->rb_node, &tree->state); |
70dec807 | 425 | state->tree = NULL; |
d1310b2e CM |
426 | free_extent_state(state); |
427 | } else { | |
428 | WARN_ON(1); | |
429 | } | |
430 | } else { | |
431 | merge_state(tree, state); | |
432 | } | |
433 | return ret; | |
434 | } | |
435 | ||
8233767a XG |
436 | static struct extent_state * |
437 | alloc_extent_state_atomic(struct extent_state *prealloc) | |
438 | { | |
439 | if (!prealloc) | |
440 | prealloc = alloc_extent_state(GFP_ATOMIC); | |
441 | ||
442 | return prealloc; | |
443 | } | |
444 | ||
d1310b2e CM |
445 | /* |
446 | * clear some bits on a range in the tree. This may require splitting | |
447 | * or inserting elements in the tree, so the gfp mask is used to | |
448 | * indicate which allocations or sleeping are allowed. | |
449 | * | |
450 | * pass 'wake' == 1 to kick any sleepers, and 'delete' == 1 to remove | |
451 | * the given range from the tree regardless of state (ie for truncate). | |
452 | * | |
453 | * the range [start, end] is inclusive. | |
454 | * | |
455 | * This takes the tree lock, and returns < 0 on error, > 0 if any of the | |
456 | * bits were already set, or zero if none of the bits were already set. | |
457 | */ | |
458 | int clear_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, | |
2c64c53d CM |
459 | int bits, int wake, int delete, |
460 | struct extent_state **cached_state, | |
461 | gfp_t mask) | |
d1310b2e CM |
462 | { |
463 | struct extent_state *state; | |
2c64c53d | 464 | struct extent_state *cached; |
d1310b2e | 465 | struct extent_state *prealloc = NULL; |
2c64c53d | 466 | struct rb_node *next_node; |
d1310b2e | 467 | struct rb_node *node; |
5c939df5 | 468 | u64 last_end; |
d1310b2e CM |
469 | int err; |
470 | int set = 0; | |
2ac55d41 | 471 | int clear = 0; |
d1310b2e | 472 | |
0ca1f7ce YZ |
473 | if (delete) |
474 | bits |= ~EXTENT_CTLBITS; | |
475 | bits |= EXTENT_FIRST_DELALLOC; | |
476 | ||
2ac55d41 JB |
477 | if (bits & (EXTENT_IOBITS | EXTENT_BOUNDARY)) |
478 | clear = 1; | |
d1310b2e CM |
479 | again: |
480 | if (!prealloc && (mask & __GFP_WAIT)) { | |
481 | prealloc = alloc_extent_state(mask); | |
482 | if (!prealloc) | |
483 | return -ENOMEM; | |
484 | } | |
485 | ||
cad321ad | 486 | spin_lock(&tree->lock); |
2c64c53d CM |
487 | if (cached_state) { |
488 | cached = *cached_state; | |
2ac55d41 JB |
489 | |
490 | if (clear) { | |
491 | *cached_state = NULL; | |
492 | cached_state = NULL; | |
493 | } | |
494 | ||
df98b6e2 JB |
495 | if (cached && cached->tree && cached->start <= start && |
496 | cached->end > start) { | |
2ac55d41 JB |
497 | if (clear) |
498 | atomic_dec(&cached->refs); | |
2c64c53d | 499 | state = cached; |
42daec29 | 500 | goto hit_next; |
2c64c53d | 501 | } |
2ac55d41 JB |
502 | if (clear) |
503 | free_extent_state(cached); | |
2c64c53d | 504 | } |
d1310b2e CM |
505 | /* |
506 | * this search will find the extents that end after | |
507 | * our range starts | |
508 | */ | |
80ea96b1 | 509 | node = tree_search(tree, start); |
d1310b2e CM |
510 | if (!node) |
511 | goto out; | |
512 | state = rb_entry(node, struct extent_state, rb_node); | |
2c64c53d | 513 | hit_next: |
d1310b2e CM |
514 | if (state->start > end) |
515 | goto out; | |
516 | WARN_ON(state->end < start); | |
5c939df5 | 517 | last_end = state->end; |
d1310b2e | 518 | |
0449314a LB |
519 | if (state->end < end && !need_resched()) |
520 | next_node = rb_next(&state->rb_node); | |
521 | else | |
522 | next_node = NULL; | |
523 | ||
524 | /* the state doesn't have the wanted bits, go ahead */ | |
525 | if (!(state->state & bits)) | |
526 | goto next; | |
527 | ||
d1310b2e CM |
528 | /* |
529 | * | ---- desired range ---- | | |
530 | * | state | or | |
531 | * | ------------- state -------------- | | |
532 | * | |
533 | * We need to split the extent we found, and may flip | |
534 | * bits on second half. | |
535 | * | |
536 | * If the extent we found extends past our range, we | |
537 | * just split and search again. It'll get split again | |
538 | * the next time though. | |
539 | * | |
540 | * If the extent we found is inside our range, we clear | |
541 | * the desired bit on it. | |
542 | */ | |
543 | ||
544 | if (state->start < start) { | |
8233767a XG |
545 | prealloc = alloc_extent_state_atomic(prealloc); |
546 | BUG_ON(!prealloc); | |
d1310b2e CM |
547 | err = split_state(tree, state, prealloc, start); |
548 | BUG_ON(err == -EEXIST); | |
549 | prealloc = NULL; | |
550 | if (err) | |
551 | goto out; | |
552 | if (state->end <= end) { | |
0ca1f7ce | 553 | set |= clear_state_bit(tree, state, &bits, wake); |
5c939df5 YZ |
554 | if (last_end == (u64)-1) |
555 | goto out; | |
556 | start = last_end + 1; | |
d1310b2e CM |
557 | } |
558 | goto search_again; | |
559 | } | |
560 | /* | |
561 | * | ---- desired range ---- | | |
562 | * | state | | |
563 | * We need to split the extent, and clear the bit | |
564 | * on the first half | |
565 | */ | |
566 | if (state->start <= end && state->end > end) { | |
8233767a XG |
567 | prealloc = alloc_extent_state_atomic(prealloc); |
568 | BUG_ON(!prealloc); | |
d1310b2e CM |
569 | err = split_state(tree, state, prealloc, end + 1); |
570 | BUG_ON(err == -EEXIST); | |
d1310b2e CM |
571 | if (wake) |
572 | wake_up(&state->wq); | |
42daec29 | 573 | |
0ca1f7ce | 574 | set |= clear_state_bit(tree, prealloc, &bits, wake); |
9ed74f2d | 575 | |
d1310b2e CM |
576 | prealloc = NULL; |
577 | goto out; | |
578 | } | |
42daec29 | 579 | |
0ca1f7ce | 580 | set |= clear_state_bit(tree, state, &bits, wake); |
0449314a | 581 | next: |
5c939df5 YZ |
582 | if (last_end == (u64)-1) |
583 | goto out; | |
584 | start = last_end + 1; | |
2c64c53d CM |
585 | if (start <= end && next_node) { |
586 | state = rb_entry(next_node, struct extent_state, | |
587 | rb_node); | |
692e5759 | 588 | goto hit_next; |
2c64c53d | 589 | } |
d1310b2e CM |
590 | goto search_again; |
591 | ||
592 | out: | |
cad321ad | 593 | spin_unlock(&tree->lock); |
d1310b2e CM |
594 | if (prealloc) |
595 | free_extent_state(prealloc); | |
596 | ||
597 | return set; | |
598 | ||
599 | search_again: | |
600 | if (start > end) | |
601 | goto out; | |
cad321ad | 602 | spin_unlock(&tree->lock); |
d1310b2e CM |
603 | if (mask & __GFP_WAIT) |
604 | cond_resched(); | |
605 | goto again; | |
606 | } | |
d1310b2e CM |
607 | |
608 | static int wait_on_state(struct extent_io_tree *tree, | |
609 | struct extent_state *state) | |
641f5219 CH |
610 | __releases(tree->lock) |
611 | __acquires(tree->lock) | |
d1310b2e CM |
612 | { |
613 | DEFINE_WAIT(wait); | |
614 | prepare_to_wait(&state->wq, &wait, TASK_UNINTERRUPTIBLE); | |
cad321ad | 615 | spin_unlock(&tree->lock); |
d1310b2e | 616 | schedule(); |
cad321ad | 617 | spin_lock(&tree->lock); |
d1310b2e CM |
618 | finish_wait(&state->wq, &wait); |
619 | return 0; | |
620 | } | |
621 | ||
622 | /* | |
623 | * waits for one or more bits to clear on a range in the state tree. | |
624 | * The range [start, end] is inclusive. | |
625 | * The tree lock is taken by this function | |
626 | */ | |
627 | int wait_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, int bits) | |
628 | { | |
629 | struct extent_state *state; | |
630 | struct rb_node *node; | |
631 | ||
cad321ad | 632 | spin_lock(&tree->lock); |
d1310b2e CM |
633 | again: |
634 | while (1) { | |
635 | /* | |
636 | * this search will find all the extents that end after | |
637 | * our range starts | |
638 | */ | |
80ea96b1 | 639 | node = tree_search(tree, start); |
d1310b2e CM |
640 | if (!node) |
641 | break; | |
642 | ||
643 | state = rb_entry(node, struct extent_state, rb_node); | |
644 | ||
645 | if (state->start > end) | |
646 | goto out; | |
647 | ||
648 | if (state->state & bits) { | |
649 | start = state->start; | |
650 | atomic_inc(&state->refs); | |
651 | wait_on_state(tree, state); | |
652 | free_extent_state(state); | |
653 | goto again; | |
654 | } | |
655 | start = state->end + 1; | |
656 | ||
657 | if (start > end) | |
658 | break; | |
659 | ||
ded91f08 | 660 | cond_resched_lock(&tree->lock); |
d1310b2e CM |
661 | } |
662 | out: | |
cad321ad | 663 | spin_unlock(&tree->lock); |
d1310b2e CM |
664 | return 0; |
665 | } | |
d1310b2e | 666 | |
1bf85046 | 667 | static void set_state_bits(struct extent_io_tree *tree, |
d1310b2e | 668 | struct extent_state *state, |
0ca1f7ce | 669 | int *bits) |
d1310b2e | 670 | { |
0ca1f7ce | 671 | int bits_to_set = *bits & ~EXTENT_CTLBITS; |
9ed74f2d | 672 | |
1bf85046 | 673 | set_state_cb(tree, state, bits); |
0ca1f7ce | 674 | if ((bits_to_set & EXTENT_DIRTY) && !(state->state & EXTENT_DIRTY)) { |
d1310b2e CM |
675 | u64 range = state->end - state->start + 1; |
676 | tree->dirty_bytes += range; | |
677 | } | |
0ca1f7ce | 678 | state->state |= bits_to_set; |
d1310b2e CM |
679 | } |
680 | ||
2c64c53d CM |
681 | static void cache_state(struct extent_state *state, |
682 | struct extent_state **cached_ptr) | |
683 | { | |
684 | if (cached_ptr && !(*cached_ptr)) { | |
685 | if (state->state & (EXTENT_IOBITS | EXTENT_BOUNDARY)) { | |
686 | *cached_ptr = state; | |
687 | atomic_inc(&state->refs); | |
688 | } | |
689 | } | |
690 | } | |
691 | ||
507903b8 AJ |
692 | static void uncache_state(struct extent_state **cached_ptr) |
693 | { | |
694 | if (cached_ptr && (*cached_ptr)) { | |
695 | struct extent_state *state = *cached_ptr; | |
109b36a2 CM |
696 | *cached_ptr = NULL; |
697 | free_extent_state(state); | |
507903b8 AJ |
698 | } |
699 | } | |
700 | ||
d1310b2e | 701 | /* |
1edbb734 CM |
702 | * set some bits on a range in the tree. This may require allocations or |
703 | * sleeping, so the gfp mask is used to indicate what is allowed. | |
d1310b2e | 704 | * |
1edbb734 CM |
705 | * If any of the exclusive bits are set, this will fail with -EEXIST if some |
706 | * part of the range already has the desired bits set. The start of the | |
707 | * existing range is returned in failed_start in this case. | |
d1310b2e | 708 | * |
1edbb734 | 709 | * [start, end] is inclusive This takes the tree lock. |
d1310b2e | 710 | */ |
1edbb734 | 711 | |
4845e44f CM |
712 | int set_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, |
713 | int bits, int exclusive_bits, u64 *failed_start, | |
714 | struct extent_state **cached_state, gfp_t mask) | |
d1310b2e CM |
715 | { |
716 | struct extent_state *state; | |
717 | struct extent_state *prealloc = NULL; | |
718 | struct rb_node *node; | |
d1310b2e | 719 | int err = 0; |
d1310b2e CM |
720 | u64 last_start; |
721 | u64 last_end; | |
42daec29 | 722 | |
0ca1f7ce | 723 | bits |= EXTENT_FIRST_DELALLOC; |
d1310b2e CM |
724 | again: |
725 | if (!prealloc && (mask & __GFP_WAIT)) { | |
726 | prealloc = alloc_extent_state(mask); | |
8233767a | 727 | BUG_ON(!prealloc); |
d1310b2e CM |
728 | } |
729 | ||
cad321ad | 730 | spin_lock(&tree->lock); |
9655d298 CM |
731 | if (cached_state && *cached_state) { |
732 | state = *cached_state; | |
df98b6e2 JB |
733 | if (state->start <= start && state->end > start && |
734 | state->tree) { | |
9655d298 CM |
735 | node = &state->rb_node; |
736 | goto hit_next; | |
737 | } | |
738 | } | |
d1310b2e CM |
739 | /* |
740 | * this search will find all the extents that end after | |
741 | * our range starts. | |
742 | */ | |
80ea96b1 | 743 | node = tree_search(tree, start); |
d1310b2e | 744 | if (!node) { |
8233767a XG |
745 | prealloc = alloc_extent_state_atomic(prealloc); |
746 | BUG_ON(!prealloc); | |
0ca1f7ce | 747 | err = insert_state(tree, prealloc, start, end, &bits); |
d1310b2e CM |
748 | prealloc = NULL; |
749 | BUG_ON(err == -EEXIST); | |
750 | goto out; | |
751 | } | |
d1310b2e | 752 | state = rb_entry(node, struct extent_state, rb_node); |
40431d6c | 753 | hit_next: |
d1310b2e CM |
754 | last_start = state->start; |
755 | last_end = state->end; | |
756 | ||
757 | /* | |
758 | * | ---- desired range ---- | | |
759 | * | state | | |
760 | * | |
761 | * Just lock what we found and keep going | |
762 | */ | |
763 | if (state->start == start && state->end <= end) { | |
40431d6c | 764 | struct rb_node *next_node; |
1edbb734 | 765 | if (state->state & exclusive_bits) { |
d1310b2e CM |
766 | *failed_start = state->start; |
767 | err = -EEXIST; | |
768 | goto out; | |
769 | } | |
42daec29 | 770 | |
1bf85046 | 771 | set_state_bits(tree, state, &bits); |
9ed74f2d | 772 | |
2c64c53d | 773 | cache_state(state, cached_state); |
d1310b2e | 774 | merge_state(tree, state); |
5c939df5 YZ |
775 | if (last_end == (u64)-1) |
776 | goto out; | |
40431d6c | 777 | |
5c939df5 | 778 | start = last_end + 1; |
df98b6e2 | 779 | next_node = rb_next(&state->rb_node); |
c7f895a2 XG |
780 | if (next_node && start < end && prealloc && !need_resched()) { |
781 | state = rb_entry(next_node, struct extent_state, | |
782 | rb_node); | |
783 | if (state->start == start) | |
784 | goto hit_next; | |
40431d6c | 785 | } |
d1310b2e CM |
786 | goto search_again; |
787 | } | |
788 | ||
789 | /* | |
790 | * | ---- desired range ---- | | |
791 | * | state | | |
792 | * or | |
793 | * | ------------- state -------------- | | |
794 | * | |
795 | * We need to split the extent we found, and may flip bits on | |
796 | * second half. | |
797 | * | |
798 | * If the extent we found extends past our | |
799 | * range, we just split and search again. It'll get split | |
800 | * again the next time though. | |
801 | * | |
802 | * If the extent we found is inside our range, we set the | |
803 | * desired bit on it. | |
804 | */ | |
805 | if (state->start < start) { | |
1edbb734 | 806 | if (state->state & exclusive_bits) { |
d1310b2e CM |
807 | *failed_start = start; |
808 | err = -EEXIST; | |
809 | goto out; | |
810 | } | |
8233767a XG |
811 | |
812 | prealloc = alloc_extent_state_atomic(prealloc); | |
813 | BUG_ON(!prealloc); | |
d1310b2e CM |
814 | err = split_state(tree, state, prealloc, start); |
815 | BUG_ON(err == -EEXIST); | |
816 | prealloc = NULL; | |
817 | if (err) | |
818 | goto out; | |
819 | if (state->end <= end) { | |
1bf85046 | 820 | set_state_bits(tree, state, &bits); |
2c64c53d | 821 | cache_state(state, cached_state); |
d1310b2e | 822 | merge_state(tree, state); |
5c939df5 YZ |
823 | if (last_end == (u64)-1) |
824 | goto out; | |
825 | start = last_end + 1; | |
d1310b2e CM |
826 | } |
827 | goto search_again; | |
828 | } | |
829 | /* | |
830 | * | ---- desired range ---- | | |
831 | * | state | or | state | | |
832 | * | |
833 | * There's a hole, we need to insert something in it and | |
834 | * ignore the extent we found. | |
835 | */ | |
836 | if (state->start > start) { | |
837 | u64 this_end; | |
838 | if (end < last_start) | |
839 | this_end = end; | |
840 | else | |
d397712b | 841 | this_end = last_start - 1; |
8233767a XG |
842 | |
843 | prealloc = alloc_extent_state_atomic(prealloc); | |
844 | BUG_ON(!prealloc); | |
c7f895a2 XG |
845 | |
846 | /* | |
847 | * Avoid to free 'prealloc' if it can be merged with | |
848 | * the later extent. | |
849 | */ | |
d1310b2e | 850 | err = insert_state(tree, prealloc, start, this_end, |
0ca1f7ce | 851 | &bits); |
d1310b2e | 852 | BUG_ON(err == -EEXIST); |
9ed74f2d | 853 | if (err) { |
c7f895a2 | 854 | free_extent_state(prealloc); |
9ed74f2d | 855 | prealloc = NULL; |
d1310b2e | 856 | goto out; |
9ed74f2d JB |
857 | } |
858 | cache_state(prealloc, cached_state); | |
859 | prealloc = NULL; | |
d1310b2e CM |
860 | start = this_end + 1; |
861 | goto search_again; | |
862 | } | |
863 | /* | |
864 | * | ---- desired range ---- | | |
865 | * | state | | |
866 | * We need to split the extent, and set the bit | |
867 | * on the first half | |
868 | */ | |
869 | if (state->start <= end && state->end > end) { | |
1edbb734 | 870 | if (state->state & exclusive_bits) { |
d1310b2e CM |
871 | *failed_start = start; |
872 | err = -EEXIST; | |
873 | goto out; | |
874 | } | |
8233767a XG |
875 | |
876 | prealloc = alloc_extent_state_atomic(prealloc); | |
877 | BUG_ON(!prealloc); | |
d1310b2e CM |
878 | err = split_state(tree, state, prealloc, end + 1); |
879 | BUG_ON(err == -EEXIST); | |
880 | ||
1bf85046 | 881 | set_state_bits(tree, prealloc, &bits); |
2c64c53d | 882 | cache_state(prealloc, cached_state); |
d1310b2e CM |
883 | merge_state(tree, prealloc); |
884 | prealloc = NULL; | |
885 | goto out; | |
886 | } | |
887 | ||
888 | goto search_again; | |
889 | ||
890 | out: | |
cad321ad | 891 | spin_unlock(&tree->lock); |
d1310b2e CM |
892 | if (prealloc) |
893 | free_extent_state(prealloc); | |
894 | ||
895 | return err; | |
896 | ||
897 | search_again: | |
898 | if (start > end) | |
899 | goto out; | |
cad321ad | 900 | spin_unlock(&tree->lock); |
d1310b2e CM |
901 | if (mask & __GFP_WAIT) |
902 | cond_resched(); | |
903 | goto again; | |
904 | } | |
d1310b2e | 905 | |
462d6fac JB |
906 | /** |
907 | * convert_extent - convert all bits in a given range from one bit to another | |
908 | * @tree: the io tree to search | |
909 | * @start: the start offset in bytes | |
910 | * @end: the end offset in bytes (inclusive) | |
911 | * @bits: the bits to set in this range | |
912 | * @clear_bits: the bits to clear in this range | |
913 | * @mask: the allocation mask | |
914 | * | |
915 | * This will go through and set bits for the given range. If any states exist | |
916 | * already in this range they are set with the given bit and cleared of the | |
917 | * clear_bits. This is only meant to be used by things that are mergeable, ie | |
918 | * converting from say DELALLOC to DIRTY. This is not meant to be used with | |
919 | * boundary bits like LOCK. | |
920 | */ | |
921 | int convert_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, | |
922 | int bits, int clear_bits, gfp_t mask) | |
923 | { | |
924 | struct extent_state *state; | |
925 | struct extent_state *prealloc = NULL; | |
926 | struct rb_node *node; | |
927 | int err = 0; | |
928 | u64 last_start; | |
929 | u64 last_end; | |
930 | ||
931 | again: | |
932 | if (!prealloc && (mask & __GFP_WAIT)) { | |
933 | prealloc = alloc_extent_state(mask); | |
934 | if (!prealloc) | |
935 | return -ENOMEM; | |
936 | } | |
937 | ||
938 | spin_lock(&tree->lock); | |
939 | /* | |
940 | * this search will find all the extents that end after | |
941 | * our range starts. | |
942 | */ | |
943 | node = tree_search(tree, start); | |
944 | if (!node) { | |
945 | prealloc = alloc_extent_state_atomic(prealloc); | |
1cf4ffdb LB |
946 | if (!prealloc) { |
947 | err = -ENOMEM; | |
948 | goto out; | |
949 | } | |
462d6fac JB |
950 | err = insert_state(tree, prealloc, start, end, &bits); |
951 | prealloc = NULL; | |
952 | BUG_ON(err == -EEXIST); | |
953 | goto out; | |
954 | } | |
955 | state = rb_entry(node, struct extent_state, rb_node); | |
956 | hit_next: | |
957 | last_start = state->start; | |
958 | last_end = state->end; | |
959 | ||
960 | /* | |
961 | * | ---- desired range ---- | | |
962 | * | state | | |
963 | * | |
964 | * Just lock what we found and keep going | |
965 | */ | |
966 | if (state->start == start && state->end <= end) { | |
967 | struct rb_node *next_node; | |
968 | ||
969 | set_state_bits(tree, state, &bits); | |
970 | clear_state_bit(tree, state, &clear_bits, 0); | |
462d6fac JB |
971 | if (last_end == (u64)-1) |
972 | goto out; | |
973 | ||
974 | start = last_end + 1; | |
975 | next_node = rb_next(&state->rb_node); | |
976 | if (next_node && start < end && prealloc && !need_resched()) { | |
977 | state = rb_entry(next_node, struct extent_state, | |
978 | rb_node); | |
979 | if (state->start == start) | |
980 | goto hit_next; | |
981 | } | |
982 | goto search_again; | |
983 | } | |
984 | ||
985 | /* | |
986 | * | ---- desired range ---- | | |
987 | * | state | | |
988 | * or | |
989 | * | ------------- state -------------- | | |
990 | * | |
991 | * We need to split the extent we found, and may flip bits on | |
992 | * second half. | |
993 | * | |
994 | * If the extent we found extends past our | |
995 | * range, we just split and search again. It'll get split | |
996 | * again the next time though. | |
997 | * | |
998 | * If the extent we found is inside our range, we set the | |
999 | * desired bit on it. | |
1000 | */ | |
1001 | if (state->start < start) { | |
1002 | prealloc = alloc_extent_state_atomic(prealloc); | |
1cf4ffdb LB |
1003 | if (!prealloc) { |
1004 | err = -ENOMEM; | |
1005 | goto out; | |
1006 | } | |
462d6fac JB |
1007 | err = split_state(tree, state, prealloc, start); |
1008 | BUG_ON(err == -EEXIST); | |
1009 | prealloc = NULL; | |
1010 | if (err) | |
1011 | goto out; | |
1012 | if (state->end <= end) { | |
1013 | set_state_bits(tree, state, &bits); | |
1014 | clear_state_bit(tree, state, &clear_bits, 0); | |
462d6fac JB |
1015 | if (last_end == (u64)-1) |
1016 | goto out; | |
1017 | start = last_end + 1; | |
1018 | } | |
1019 | goto search_again; | |
1020 | } | |
1021 | /* | |
1022 | * | ---- desired range ---- | | |
1023 | * | state | or | state | | |
1024 | * | |
1025 | * There's a hole, we need to insert something in it and | |
1026 | * ignore the extent we found. | |
1027 | */ | |
1028 | if (state->start > start) { | |
1029 | u64 this_end; | |
1030 | if (end < last_start) | |
1031 | this_end = end; | |
1032 | else | |
1033 | this_end = last_start - 1; | |
1034 | ||
1035 | prealloc = alloc_extent_state_atomic(prealloc); | |
1cf4ffdb LB |
1036 | if (!prealloc) { |
1037 | err = -ENOMEM; | |
1038 | goto out; | |
1039 | } | |
462d6fac JB |
1040 | |
1041 | /* | |
1042 | * Avoid to free 'prealloc' if it can be merged with | |
1043 | * the later extent. | |
1044 | */ | |
1045 | err = insert_state(tree, prealloc, start, this_end, | |
1046 | &bits); | |
1047 | BUG_ON(err == -EEXIST); | |
1048 | if (err) { | |
1049 | free_extent_state(prealloc); | |
1050 | prealloc = NULL; | |
1051 | goto out; | |
1052 | } | |
1053 | prealloc = NULL; | |
1054 | start = this_end + 1; | |
1055 | goto search_again; | |
1056 | } | |
1057 | /* | |
1058 | * | ---- desired range ---- | | |
1059 | * | state | | |
1060 | * We need to split the extent, and set the bit | |
1061 | * on the first half | |
1062 | */ | |
1063 | if (state->start <= end && state->end > end) { | |
1064 | prealloc = alloc_extent_state_atomic(prealloc); | |
1cf4ffdb LB |
1065 | if (!prealloc) { |
1066 | err = -ENOMEM; | |
1067 | goto out; | |
1068 | } | |
462d6fac JB |
1069 | |
1070 | err = split_state(tree, state, prealloc, end + 1); | |
1071 | BUG_ON(err == -EEXIST); | |
1072 | ||
1073 | set_state_bits(tree, prealloc, &bits); | |
1074 | clear_state_bit(tree, prealloc, &clear_bits, 0); | |
462d6fac JB |
1075 | prealloc = NULL; |
1076 | goto out; | |
1077 | } | |
1078 | ||
1079 | goto search_again; | |
1080 | ||
1081 | out: | |
1082 | spin_unlock(&tree->lock); | |
1083 | if (prealloc) | |
1084 | free_extent_state(prealloc); | |
1085 | ||
1086 | return err; | |
1087 | ||
1088 | search_again: | |
1089 | if (start > end) | |
1090 | goto out; | |
1091 | spin_unlock(&tree->lock); | |
1092 | if (mask & __GFP_WAIT) | |
1093 | cond_resched(); | |
1094 | goto again; | |
1095 | } | |
1096 | ||
d1310b2e CM |
1097 | /* wrappers around set/clear extent bit */ |
1098 | int set_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end, | |
1099 | gfp_t mask) | |
1100 | { | |
1101 | return set_extent_bit(tree, start, end, EXTENT_DIRTY, 0, NULL, | |
2c64c53d | 1102 | NULL, mask); |
d1310b2e | 1103 | } |
d1310b2e CM |
1104 | |
1105 | int set_extent_bits(struct extent_io_tree *tree, u64 start, u64 end, | |
1106 | int bits, gfp_t mask) | |
1107 | { | |
1108 | return set_extent_bit(tree, start, end, bits, 0, NULL, | |
2c64c53d | 1109 | NULL, mask); |
d1310b2e | 1110 | } |
d1310b2e CM |
1111 | |
1112 | int clear_extent_bits(struct extent_io_tree *tree, u64 start, u64 end, | |
1113 | int bits, gfp_t mask) | |
1114 | { | |
2c64c53d | 1115 | return clear_extent_bit(tree, start, end, bits, 0, 0, NULL, mask); |
d1310b2e | 1116 | } |
d1310b2e CM |
1117 | |
1118 | int set_extent_delalloc(struct extent_io_tree *tree, u64 start, u64 end, | |
2ac55d41 | 1119 | struct extent_state **cached_state, gfp_t mask) |
d1310b2e CM |
1120 | { |
1121 | return set_extent_bit(tree, start, end, | |
fee187d9 | 1122 | EXTENT_DELALLOC | EXTENT_UPTODATE, |
2ac55d41 | 1123 | 0, NULL, cached_state, mask); |
d1310b2e | 1124 | } |
d1310b2e CM |
1125 | |
1126 | int clear_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end, | |
1127 | gfp_t mask) | |
1128 | { | |
1129 | return clear_extent_bit(tree, start, end, | |
32c00aff | 1130 | EXTENT_DIRTY | EXTENT_DELALLOC | |
0ca1f7ce | 1131 | EXTENT_DO_ACCOUNTING, 0, 0, NULL, mask); |
d1310b2e | 1132 | } |
d1310b2e CM |
1133 | |
1134 | int set_extent_new(struct extent_io_tree *tree, u64 start, u64 end, | |
1135 | gfp_t mask) | |
1136 | { | |
1137 | return set_extent_bit(tree, start, end, EXTENT_NEW, 0, NULL, | |
2c64c53d | 1138 | NULL, mask); |
d1310b2e | 1139 | } |
d1310b2e | 1140 | |
d1310b2e | 1141 | int set_extent_uptodate(struct extent_io_tree *tree, u64 start, u64 end, |
507903b8 | 1142 | struct extent_state **cached_state, gfp_t mask) |
d1310b2e | 1143 | { |
507903b8 AJ |
1144 | return set_extent_bit(tree, start, end, EXTENT_UPTODATE, 0, |
1145 | NULL, cached_state, mask); | |
d1310b2e | 1146 | } |
d1310b2e | 1147 | |
d397712b | 1148 | static int clear_extent_uptodate(struct extent_io_tree *tree, u64 start, |
2ac55d41 JB |
1149 | u64 end, struct extent_state **cached_state, |
1150 | gfp_t mask) | |
d1310b2e | 1151 | { |
2c64c53d | 1152 | return clear_extent_bit(tree, start, end, EXTENT_UPTODATE, 0, 0, |
2ac55d41 | 1153 | cached_state, mask); |
d1310b2e | 1154 | } |
d1310b2e | 1155 | |
d352ac68 CM |
1156 | /* |
1157 | * either insert or lock state struct between start and end use mask to tell | |
1158 | * us if waiting is desired. | |
1159 | */ | |
1edbb734 | 1160 | int lock_extent_bits(struct extent_io_tree *tree, u64 start, u64 end, |
2c64c53d | 1161 | int bits, struct extent_state **cached_state, gfp_t mask) |
d1310b2e CM |
1162 | { |
1163 | int err; | |
1164 | u64 failed_start; | |
1165 | while (1) { | |
1edbb734 | 1166 | err = set_extent_bit(tree, start, end, EXTENT_LOCKED | bits, |
2c64c53d CM |
1167 | EXTENT_LOCKED, &failed_start, |
1168 | cached_state, mask); | |
d1310b2e CM |
1169 | if (err == -EEXIST && (mask & __GFP_WAIT)) { |
1170 | wait_extent_bit(tree, failed_start, end, EXTENT_LOCKED); | |
1171 | start = failed_start; | |
1172 | } else { | |
1173 | break; | |
1174 | } | |
1175 | WARN_ON(start > end); | |
1176 | } | |
1177 | return err; | |
1178 | } | |
d1310b2e | 1179 | |
1edbb734 CM |
1180 | int lock_extent(struct extent_io_tree *tree, u64 start, u64 end, gfp_t mask) |
1181 | { | |
2c64c53d | 1182 | return lock_extent_bits(tree, start, end, 0, NULL, mask); |
1edbb734 CM |
1183 | } |
1184 | ||
25179201 JB |
1185 | int try_lock_extent(struct extent_io_tree *tree, u64 start, u64 end, |
1186 | gfp_t mask) | |
1187 | { | |
1188 | int err; | |
1189 | u64 failed_start; | |
1190 | ||
2c64c53d CM |
1191 | err = set_extent_bit(tree, start, end, EXTENT_LOCKED, EXTENT_LOCKED, |
1192 | &failed_start, NULL, mask); | |
6643558d YZ |
1193 | if (err == -EEXIST) { |
1194 | if (failed_start > start) | |
1195 | clear_extent_bit(tree, start, failed_start - 1, | |
2c64c53d | 1196 | EXTENT_LOCKED, 1, 0, NULL, mask); |
25179201 | 1197 | return 0; |
6643558d | 1198 | } |
25179201 JB |
1199 | return 1; |
1200 | } | |
25179201 | 1201 | |
2c64c53d CM |
1202 | int unlock_extent_cached(struct extent_io_tree *tree, u64 start, u64 end, |
1203 | struct extent_state **cached, gfp_t mask) | |
1204 | { | |
1205 | return clear_extent_bit(tree, start, end, EXTENT_LOCKED, 1, 0, cached, | |
1206 | mask); | |
1207 | } | |
1208 | ||
507903b8 | 1209 | int unlock_extent(struct extent_io_tree *tree, u64 start, u64 end, gfp_t mask) |
d1310b2e | 1210 | { |
2c64c53d CM |
1211 | return clear_extent_bit(tree, start, end, EXTENT_LOCKED, 1, 0, NULL, |
1212 | mask); | |
d1310b2e | 1213 | } |
d1310b2e | 1214 | |
d1310b2e CM |
1215 | /* |
1216 | * helper function to set both pages and extents in the tree writeback | |
1217 | */ | |
b2950863 | 1218 | static int set_range_writeback(struct extent_io_tree *tree, u64 start, u64 end) |
d1310b2e CM |
1219 | { |
1220 | unsigned long index = start >> PAGE_CACHE_SHIFT; | |
1221 | unsigned long end_index = end >> PAGE_CACHE_SHIFT; | |
1222 | struct page *page; | |
1223 | ||
1224 | while (index <= end_index) { | |
1225 | page = find_get_page(tree->mapping, index); | |
1226 | BUG_ON(!page); | |
1227 | set_page_writeback(page); | |
1228 | page_cache_release(page); | |
1229 | index++; | |
1230 | } | |
d1310b2e CM |
1231 | return 0; |
1232 | } | |
d1310b2e | 1233 | |
d352ac68 CM |
1234 | /* find the first state struct with 'bits' set after 'start', and |
1235 | * return it. tree->lock must be held. NULL will returned if | |
1236 | * nothing was found after 'start' | |
1237 | */ | |
d7fc640e CM |
1238 | struct extent_state *find_first_extent_bit_state(struct extent_io_tree *tree, |
1239 | u64 start, int bits) | |
1240 | { | |
1241 | struct rb_node *node; | |
1242 | struct extent_state *state; | |
1243 | ||
1244 | /* | |
1245 | * this search will find all the extents that end after | |
1246 | * our range starts. | |
1247 | */ | |
1248 | node = tree_search(tree, start); | |
d397712b | 1249 | if (!node) |
d7fc640e | 1250 | goto out; |
d7fc640e | 1251 | |
d397712b | 1252 | while (1) { |
d7fc640e | 1253 | state = rb_entry(node, struct extent_state, rb_node); |
d397712b | 1254 | if (state->end >= start && (state->state & bits)) |
d7fc640e | 1255 | return state; |
d397712b | 1256 | |
d7fc640e CM |
1257 | node = rb_next(node); |
1258 | if (!node) | |
1259 | break; | |
1260 | } | |
1261 | out: | |
1262 | return NULL; | |
1263 | } | |
d7fc640e | 1264 | |
69261c4b XG |
1265 | /* |
1266 | * find the first offset in the io tree with 'bits' set. zero is | |
1267 | * returned if we find something, and *start_ret and *end_ret are | |
1268 | * set to reflect the state struct that was found. | |
1269 | * | |
1270 | * If nothing was found, 1 is returned, < 0 on error | |
1271 | */ | |
1272 | int find_first_extent_bit(struct extent_io_tree *tree, u64 start, | |
1273 | u64 *start_ret, u64 *end_ret, int bits) | |
1274 | { | |
1275 | struct extent_state *state; | |
1276 | int ret = 1; | |
1277 | ||
1278 | spin_lock(&tree->lock); | |
1279 | state = find_first_extent_bit_state(tree, start, bits); | |
1280 | if (state) { | |
1281 | *start_ret = state->start; | |
1282 | *end_ret = state->end; | |
1283 | ret = 0; | |
1284 | } | |
1285 | spin_unlock(&tree->lock); | |
1286 | return ret; | |
1287 | } | |
1288 | ||
d352ac68 CM |
1289 | /* |
1290 | * find a contiguous range of bytes in the file marked as delalloc, not | |
1291 | * more than 'max_bytes'. start and end are used to return the range, | |
1292 | * | |
1293 | * 1 is returned if we find something, 0 if nothing was in the tree | |
1294 | */ | |
c8b97818 | 1295 | static noinline u64 find_delalloc_range(struct extent_io_tree *tree, |
c2a128d2 JB |
1296 | u64 *start, u64 *end, u64 max_bytes, |
1297 | struct extent_state **cached_state) | |
d1310b2e CM |
1298 | { |
1299 | struct rb_node *node; | |
1300 | struct extent_state *state; | |
1301 | u64 cur_start = *start; | |
1302 | u64 found = 0; | |
1303 | u64 total_bytes = 0; | |
1304 | ||
cad321ad | 1305 | spin_lock(&tree->lock); |
c8b97818 | 1306 | |
d1310b2e CM |
1307 | /* |
1308 | * this search will find all the extents that end after | |
1309 | * our range starts. | |
1310 | */ | |
80ea96b1 | 1311 | node = tree_search(tree, cur_start); |
2b114d1d | 1312 | if (!node) { |
3b951516 CM |
1313 | if (!found) |
1314 | *end = (u64)-1; | |
d1310b2e CM |
1315 | goto out; |
1316 | } | |
1317 | ||
d397712b | 1318 | while (1) { |
d1310b2e | 1319 | state = rb_entry(node, struct extent_state, rb_node); |
5b21f2ed ZY |
1320 | if (found && (state->start != cur_start || |
1321 | (state->state & EXTENT_BOUNDARY))) { | |
d1310b2e CM |
1322 | goto out; |
1323 | } | |
1324 | if (!(state->state & EXTENT_DELALLOC)) { | |
1325 | if (!found) | |
1326 | *end = state->end; | |
1327 | goto out; | |
1328 | } | |
c2a128d2 | 1329 | if (!found) { |
d1310b2e | 1330 | *start = state->start; |
c2a128d2 JB |
1331 | *cached_state = state; |
1332 | atomic_inc(&state->refs); | |
1333 | } | |
d1310b2e CM |
1334 | found++; |
1335 | *end = state->end; | |
1336 | cur_start = state->end + 1; | |
1337 | node = rb_next(node); | |
1338 | if (!node) | |
1339 | break; | |
1340 | total_bytes += state->end - state->start + 1; | |
1341 | if (total_bytes >= max_bytes) | |
1342 | break; | |
1343 | } | |
1344 | out: | |
cad321ad | 1345 | spin_unlock(&tree->lock); |
d1310b2e CM |
1346 | return found; |
1347 | } | |
1348 | ||
c8b97818 CM |
1349 | static noinline int __unlock_for_delalloc(struct inode *inode, |
1350 | struct page *locked_page, | |
1351 | u64 start, u64 end) | |
1352 | { | |
1353 | int ret; | |
1354 | struct page *pages[16]; | |
1355 | unsigned long index = start >> PAGE_CACHE_SHIFT; | |
1356 | unsigned long end_index = end >> PAGE_CACHE_SHIFT; | |
1357 | unsigned long nr_pages = end_index - index + 1; | |
1358 | int i; | |
1359 | ||
1360 | if (index == locked_page->index && end_index == index) | |
1361 | return 0; | |
1362 | ||
d397712b | 1363 | while (nr_pages > 0) { |
c8b97818 | 1364 | ret = find_get_pages_contig(inode->i_mapping, index, |
5b050f04 CM |
1365 | min_t(unsigned long, nr_pages, |
1366 | ARRAY_SIZE(pages)), pages); | |
c8b97818 CM |
1367 | for (i = 0; i < ret; i++) { |
1368 | if (pages[i] != locked_page) | |
1369 | unlock_page(pages[i]); | |
1370 | page_cache_release(pages[i]); | |
1371 | } | |
1372 | nr_pages -= ret; | |
1373 | index += ret; | |
1374 | cond_resched(); | |
1375 | } | |
1376 | return 0; | |
1377 | } | |
1378 | ||
1379 | static noinline int lock_delalloc_pages(struct inode *inode, | |
1380 | struct page *locked_page, | |
1381 | u64 delalloc_start, | |
1382 | u64 delalloc_end) | |
1383 | { | |
1384 | unsigned long index = delalloc_start >> PAGE_CACHE_SHIFT; | |
1385 | unsigned long start_index = index; | |
1386 | unsigned long end_index = delalloc_end >> PAGE_CACHE_SHIFT; | |
1387 | unsigned long pages_locked = 0; | |
1388 | struct page *pages[16]; | |
1389 | unsigned long nrpages; | |
1390 | int ret; | |
1391 | int i; | |
1392 | ||
1393 | /* the caller is responsible for locking the start index */ | |
1394 | if (index == locked_page->index && index == end_index) | |
1395 | return 0; | |
1396 | ||
1397 | /* skip the page at the start index */ | |
1398 | nrpages = end_index - index + 1; | |
d397712b | 1399 | while (nrpages > 0) { |
c8b97818 | 1400 | ret = find_get_pages_contig(inode->i_mapping, index, |
5b050f04 CM |
1401 | min_t(unsigned long, |
1402 | nrpages, ARRAY_SIZE(pages)), pages); | |
c8b97818 CM |
1403 | if (ret == 0) { |
1404 | ret = -EAGAIN; | |
1405 | goto done; | |
1406 | } | |
1407 | /* now we have an array of pages, lock them all */ | |
1408 | for (i = 0; i < ret; i++) { | |
1409 | /* | |
1410 | * the caller is taking responsibility for | |
1411 | * locked_page | |
1412 | */ | |
771ed689 | 1413 | if (pages[i] != locked_page) { |
c8b97818 | 1414 | lock_page(pages[i]); |
f2b1c41c CM |
1415 | if (!PageDirty(pages[i]) || |
1416 | pages[i]->mapping != inode->i_mapping) { | |
771ed689 CM |
1417 | ret = -EAGAIN; |
1418 | unlock_page(pages[i]); | |
1419 | page_cache_release(pages[i]); | |
1420 | goto done; | |
1421 | } | |
1422 | } | |
c8b97818 | 1423 | page_cache_release(pages[i]); |
771ed689 | 1424 | pages_locked++; |
c8b97818 | 1425 | } |
c8b97818 CM |
1426 | nrpages -= ret; |
1427 | index += ret; | |
1428 | cond_resched(); | |
1429 | } | |
1430 | ret = 0; | |
1431 | done: | |
1432 | if (ret && pages_locked) { | |
1433 | __unlock_for_delalloc(inode, locked_page, | |
1434 | delalloc_start, | |
1435 | ((u64)(start_index + pages_locked - 1)) << | |
1436 | PAGE_CACHE_SHIFT); | |
1437 | } | |
1438 | return ret; | |
1439 | } | |
1440 | ||
1441 | /* | |
1442 | * find a contiguous range of bytes in the file marked as delalloc, not | |
1443 | * more than 'max_bytes'. start and end are used to return the range, | |
1444 | * | |
1445 | * 1 is returned if we find something, 0 if nothing was in the tree | |
1446 | */ | |
1447 | static noinline u64 find_lock_delalloc_range(struct inode *inode, | |
1448 | struct extent_io_tree *tree, | |
1449 | struct page *locked_page, | |
1450 | u64 *start, u64 *end, | |
1451 | u64 max_bytes) | |
1452 | { | |
1453 | u64 delalloc_start; | |
1454 | u64 delalloc_end; | |
1455 | u64 found; | |
9655d298 | 1456 | struct extent_state *cached_state = NULL; |
c8b97818 CM |
1457 | int ret; |
1458 | int loops = 0; | |
1459 | ||
1460 | again: | |
1461 | /* step one, find a bunch of delalloc bytes starting at start */ | |
1462 | delalloc_start = *start; | |
1463 | delalloc_end = 0; | |
1464 | found = find_delalloc_range(tree, &delalloc_start, &delalloc_end, | |
c2a128d2 | 1465 | max_bytes, &cached_state); |
70b99e69 | 1466 | if (!found || delalloc_end <= *start) { |
c8b97818 CM |
1467 | *start = delalloc_start; |
1468 | *end = delalloc_end; | |
c2a128d2 | 1469 | free_extent_state(cached_state); |
c8b97818 CM |
1470 | return found; |
1471 | } | |
1472 | ||
70b99e69 CM |
1473 | /* |
1474 | * start comes from the offset of locked_page. We have to lock | |
1475 | * pages in order, so we can't process delalloc bytes before | |
1476 | * locked_page | |
1477 | */ | |
d397712b | 1478 | if (delalloc_start < *start) |
70b99e69 | 1479 | delalloc_start = *start; |
70b99e69 | 1480 | |
c8b97818 CM |
1481 | /* |
1482 | * make sure to limit the number of pages we try to lock down | |
1483 | * if we're looping. | |
1484 | */ | |
d397712b | 1485 | if (delalloc_end + 1 - delalloc_start > max_bytes && loops) |
771ed689 | 1486 | delalloc_end = delalloc_start + PAGE_CACHE_SIZE - 1; |
d397712b | 1487 | |
c8b97818 CM |
1488 | /* step two, lock all the pages after the page that has start */ |
1489 | ret = lock_delalloc_pages(inode, locked_page, | |
1490 | delalloc_start, delalloc_end); | |
1491 | if (ret == -EAGAIN) { | |
1492 | /* some of the pages are gone, lets avoid looping by | |
1493 | * shortening the size of the delalloc range we're searching | |
1494 | */ | |
9655d298 | 1495 | free_extent_state(cached_state); |
c8b97818 CM |
1496 | if (!loops) { |
1497 | unsigned long offset = (*start) & (PAGE_CACHE_SIZE - 1); | |
1498 | max_bytes = PAGE_CACHE_SIZE - offset; | |
1499 | loops = 1; | |
1500 | goto again; | |
1501 | } else { | |
1502 | found = 0; | |
1503 | goto out_failed; | |
1504 | } | |
1505 | } | |
1506 | BUG_ON(ret); | |
1507 | ||
1508 | /* step three, lock the state bits for the whole range */ | |
9655d298 CM |
1509 | lock_extent_bits(tree, delalloc_start, delalloc_end, |
1510 | 0, &cached_state, GFP_NOFS); | |
c8b97818 CM |
1511 | |
1512 | /* then test to make sure it is all still delalloc */ | |
1513 | ret = test_range_bit(tree, delalloc_start, delalloc_end, | |
9655d298 | 1514 | EXTENT_DELALLOC, 1, cached_state); |
c8b97818 | 1515 | if (!ret) { |
9655d298 CM |
1516 | unlock_extent_cached(tree, delalloc_start, delalloc_end, |
1517 | &cached_state, GFP_NOFS); | |
c8b97818 CM |
1518 | __unlock_for_delalloc(inode, locked_page, |
1519 | delalloc_start, delalloc_end); | |
1520 | cond_resched(); | |
1521 | goto again; | |
1522 | } | |
9655d298 | 1523 | free_extent_state(cached_state); |
c8b97818 CM |
1524 | *start = delalloc_start; |
1525 | *end = delalloc_end; | |
1526 | out_failed: | |
1527 | return found; | |
1528 | } | |
1529 | ||
1530 | int extent_clear_unlock_delalloc(struct inode *inode, | |
1531 | struct extent_io_tree *tree, | |
1532 | u64 start, u64 end, struct page *locked_page, | |
a791e35e | 1533 | unsigned long op) |
c8b97818 CM |
1534 | { |
1535 | int ret; | |
1536 | struct page *pages[16]; | |
1537 | unsigned long index = start >> PAGE_CACHE_SHIFT; | |
1538 | unsigned long end_index = end >> PAGE_CACHE_SHIFT; | |
1539 | unsigned long nr_pages = end_index - index + 1; | |
1540 | int i; | |
771ed689 | 1541 | int clear_bits = 0; |
c8b97818 | 1542 | |
a791e35e | 1543 | if (op & EXTENT_CLEAR_UNLOCK) |
771ed689 | 1544 | clear_bits |= EXTENT_LOCKED; |
a791e35e | 1545 | if (op & EXTENT_CLEAR_DIRTY) |
c8b97818 CM |
1546 | clear_bits |= EXTENT_DIRTY; |
1547 | ||
a791e35e | 1548 | if (op & EXTENT_CLEAR_DELALLOC) |
771ed689 CM |
1549 | clear_bits |= EXTENT_DELALLOC; |
1550 | ||
2c64c53d | 1551 | clear_extent_bit(tree, start, end, clear_bits, 1, 0, NULL, GFP_NOFS); |
32c00aff JB |
1552 | if (!(op & (EXTENT_CLEAR_UNLOCK_PAGE | EXTENT_CLEAR_DIRTY | |
1553 | EXTENT_SET_WRITEBACK | EXTENT_END_WRITEBACK | | |
1554 | EXTENT_SET_PRIVATE2))) | |
771ed689 | 1555 | return 0; |
c8b97818 | 1556 | |
d397712b | 1557 | while (nr_pages > 0) { |
c8b97818 | 1558 | ret = find_get_pages_contig(inode->i_mapping, index, |
5b050f04 CM |
1559 | min_t(unsigned long, |
1560 | nr_pages, ARRAY_SIZE(pages)), pages); | |
c8b97818 | 1561 | for (i = 0; i < ret; i++) { |
8b62b72b | 1562 | |
a791e35e | 1563 | if (op & EXTENT_SET_PRIVATE2) |
8b62b72b CM |
1564 | SetPagePrivate2(pages[i]); |
1565 | ||
c8b97818 CM |
1566 | if (pages[i] == locked_page) { |
1567 | page_cache_release(pages[i]); | |
1568 | continue; | |
1569 | } | |
a791e35e | 1570 | if (op & EXTENT_CLEAR_DIRTY) |
c8b97818 | 1571 | clear_page_dirty_for_io(pages[i]); |
a791e35e | 1572 | if (op & EXTENT_SET_WRITEBACK) |
c8b97818 | 1573 | set_page_writeback(pages[i]); |
a791e35e | 1574 | if (op & EXTENT_END_WRITEBACK) |
c8b97818 | 1575 | end_page_writeback(pages[i]); |
a791e35e | 1576 | if (op & EXTENT_CLEAR_UNLOCK_PAGE) |
771ed689 | 1577 | unlock_page(pages[i]); |
c8b97818 CM |
1578 | page_cache_release(pages[i]); |
1579 | } | |
1580 | nr_pages -= ret; | |
1581 | index += ret; | |
1582 | cond_resched(); | |
1583 | } | |
1584 | return 0; | |
1585 | } | |
c8b97818 | 1586 | |
d352ac68 CM |
1587 | /* |
1588 | * count the number of bytes in the tree that have a given bit(s) | |
1589 | * set. This can be fairly slow, except for EXTENT_DIRTY which is | |
1590 | * cached. The total number found is returned. | |
1591 | */ | |
d1310b2e CM |
1592 | u64 count_range_bits(struct extent_io_tree *tree, |
1593 | u64 *start, u64 search_end, u64 max_bytes, | |
ec29ed5b | 1594 | unsigned long bits, int contig) |
d1310b2e CM |
1595 | { |
1596 | struct rb_node *node; | |
1597 | struct extent_state *state; | |
1598 | u64 cur_start = *start; | |
1599 | u64 total_bytes = 0; | |
ec29ed5b | 1600 | u64 last = 0; |
d1310b2e CM |
1601 | int found = 0; |
1602 | ||
1603 | if (search_end <= cur_start) { | |
d1310b2e CM |
1604 | WARN_ON(1); |
1605 | return 0; | |
1606 | } | |
1607 | ||
cad321ad | 1608 | spin_lock(&tree->lock); |
d1310b2e CM |
1609 | if (cur_start == 0 && bits == EXTENT_DIRTY) { |
1610 | total_bytes = tree->dirty_bytes; | |
1611 | goto out; | |
1612 | } | |
1613 | /* | |
1614 | * this search will find all the extents that end after | |
1615 | * our range starts. | |
1616 | */ | |
80ea96b1 | 1617 | node = tree_search(tree, cur_start); |
d397712b | 1618 | if (!node) |
d1310b2e | 1619 | goto out; |
d1310b2e | 1620 | |
d397712b | 1621 | while (1) { |
d1310b2e CM |
1622 | state = rb_entry(node, struct extent_state, rb_node); |
1623 | if (state->start > search_end) | |
1624 | break; | |
ec29ed5b CM |
1625 | if (contig && found && state->start > last + 1) |
1626 | break; | |
1627 | if (state->end >= cur_start && (state->state & bits) == bits) { | |
d1310b2e CM |
1628 | total_bytes += min(search_end, state->end) + 1 - |
1629 | max(cur_start, state->start); | |
1630 | if (total_bytes >= max_bytes) | |
1631 | break; | |
1632 | if (!found) { | |
af60bed2 | 1633 | *start = max(cur_start, state->start); |
d1310b2e CM |
1634 | found = 1; |
1635 | } | |
ec29ed5b CM |
1636 | last = state->end; |
1637 | } else if (contig && found) { | |
1638 | break; | |
d1310b2e CM |
1639 | } |
1640 | node = rb_next(node); | |
1641 | if (!node) | |
1642 | break; | |
1643 | } | |
1644 | out: | |
cad321ad | 1645 | spin_unlock(&tree->lock); |
d1310b2e CM |
1646 | return total_bytes; |
1647 | } | |
b2950863 | 1648 | |
d352ac68 CM |
1649 | /* |
1650 | * set the private field for a given byte offset in the tree. If there isn't | |
1651 | * an extent_state there already, this does nothing. | |
1652 | */ | |
d1310b2e CM |
1653 | int set_state_private(struct extent_io_tree *tree, u64 start, u64 private) |
1654 | { | |
1655 | struct rb_node *node; | |
1656 | struct extent_state *state; | |
1657 | int ret = 0; | |
1658 | ||
cad321ad | 1659 | spin_lock(&tree->lock); |
d1310b2e CM |
1660 | /* |
1661 | * this search will find all the extents that end after | |
1662 | * our range starts. | |
1663 | */ | |
80ea96b1 | 1664 | node = tree_search(tree, start); |
2b114d1d | 1665 | if (!node) { |
d1310b2e CM |
1666 | ret = -ENOENT; |
1667 | goto out; | |
1668 | } | |
1669 | state = rb_entry(node, struct extent_state, rb_node); | |
1670 | if (state->start != start) { | |
1671 | ret = -ENOENT; | |
1672 | goto out; | |
1673 | } | |
1674 | state->private = private; | |
1675 | out: | |
cad321ad | 1676 | spin_unlock(&tree->lock); |
d1310b2e CM |
1677 | return ret; |
1678 | } | |
1679 | ||
1680 | int get_state_private(struct extent_io_tree *tree, u64 start, u64 *private) | |
1681 | { | |
1682 | struct rb_node *node; | |
1683 | struct extent_state *state; | |
1684 | int ret = 0; | |
1685 | ||
cad321ad | 1686 | spin_lock(&tree->lock); |
d1310b2e CM |
1687 | /* |
1688 | * this search will find all the extents that end after | |
1689 | * our range starts. | |
1690 | */ | |
80ea96b1 | 1691 | node = tree_search(tree, start); |
2b114d1d | 1692 | if (!node) { |
d1310b2e CM |
1693 | ret = -ENOENT; |
1694 | goto out; | |
1695 | } | |
1696 | state = rb_entry(node, struct extent_state, rb_node); | |
1697 | if (state->start != start) { | |
1698 | ret = -ENOENT; | |
1699 | goto out; | |
1700 | } | |
1701 | *private = state->private; | |
1702 | out: | |
cad321ad | 1703 | spin_unlock(&tree->lock); |
d1310b2e CM |
1704 | return ret; |
1705 | } | |
1706 | ||
1707 | /* | |
1708 | * searches a range in the state tree for a given mask. | |
70dec807 | 1709 | * If 'filled' == 1, this returns 1 only if every extent in the tree |
d1310b2e CM |
1710 | * has the bits set. Otherwise, 1 is returned if any bit in the |
1711 | * range is found set. | |
1712 | */ | |
1713 | int test_range_bit(struct extent_io_tree *tree, u64 start, u64 end, | |
9655d298 | 1714 | int bits, int filled, struct extent_state *cached) |
d1310b2e CM |
1715 | { |
1716 | struct extent_state *state = NULL; | |
1717 | struct rb_node *node; | |
1718 | int bitset = 0; | |
d1310b2e | 1719 | |
cad321ad | 1720 | spin_lock(&tree->lock); |
df98b6e2 JB |
1721 | if (cached && cached->tree && cached->start <= start && |
1722 | cached->end > start) | |
9655d298 CM |
1723 | node = &cached->rb_node; |
1724 | else | |
1725 | node = tree_search(tree, start); | |
d1310b2e CM |
1726 | while (node && start <= end) { |
1727 | state = rb_entry(node, struct extent_state, rb_node); | |
1728 | ||
1729 | if (filled && state->start > start) { | |
1730 | bitset = 0; | |
1731 | break; | |
1732 | } | |
1733 | ||
1734 | if (state->start > end) | |
1735 | break; | |
1736 | ||
1737 | if (state->state & bits) { | |
1738 | bitset = 1; | |
1739 | if (!filled) | |
1740 | break; | |
1741 | } else if (filled) { | |
1742 | bitset = 0; | |
1743 | break; | |
1744 | } | |
46562cec CM |
1745 | |
1746 | if (state->end == (u64)-1) | |
1747 | break; | |
1748 | ||
d1310b2e CM |
1749 | start = state->end + 1; |
1750 | if (start > end) | |
1751 | break; | |
1752 | node = rb_next(node); | |
1753 | if (!node) { | |
1754 | if (filled) | |
1755 | bitset = 0; | |
1756 | break; | |
1757 | } | |
1758 | } | |
cad321ad | 1759 | spin_unlock(&tree->lock); |
d1310b2e CM |
1760 | return bitset; |
1761 | } | |
d1310b2e CM |
1762 | |
1763 | /* | |
1764 | * helper function to set a given page up to date if all the | |
1765 | * extents in the tree for that page are up to date | |
1766 | */ | |
1767 | static int check_page_uptodate(struct extent_io_tree *tree, | |
1768 | struct page *page) | |
1769 | { | |
1770 | u64 start = (u64)page->index << PAGE_CACHE_SHIFT; | |
1771 | u64 end = start + PAGE_CACHE_SIZE - 1; | |
9655d298 | 1772 | if (test_range_bit(tree, start, end, EXTENT_UPTODATE, 1, NULL)) |
d1310b2e CM |
1773 | SetPageUptodate(page); |
1774 | return 0; | |
1775 | } | |
1776 | ||
1777 | /* | |
1778 | * helper function to unlock a page if all the extents in the tree | |
1779 | * for that page are unlocked | |
1780 | */ | |
1781 | static int check_page_locked(struct extent_io_tree *tree, | |
1782 | struct page *page) | |
1783 | { | |
1784 | u64 start = (u64)page->index << PAGE_CACHE_SHIFT; | |
1785 | u64 end = start + PAGE_CACHE_SIZE - 1; | |
9655d298 | 1786 | if (!test_range_bit(tree, start, end, EXTENT_LOCKED, 0, NULL)) |
d1310b2e CM |
1787 | unlock_page(page); |
1788 | return 0; | |
1789 | } | |
1790 | ||
1791 | /* | |
1792 | * helper function to end page writeback if all the extents | |
1793 | * in the tree for that page are done with writeback | |
1794 | */ | |
1795 | static int check_page_writeback(struct extent_io_tree *tree, | |
1796 | struct page *page) | |
1797 | { | |
1edbb734 | 1798 | end_page_writeback(page); |
d1310b2e CM |
1799 | return 0; |
1800 | } | |
1801 | ||
4a54c8c1 JS |
1802 | /* |
1803 | * When IO fails, either with EIO or csum verification fails, we | |
1804 | * try other mirrors that might have a good copy of the data. This | |
1805 | * io_failure_record is used to record state as we go through all the | |
1806 | * mirrors. If another mirror has good data, the page is set up to date | |
1807 | * and things continue. If a good mirror can't be found, the original | |
1808 | * bio end_io callback is called to indicate things have failed. | |
1809 | */ | |
1810 | struct io_failure_record { | |
1811 | struct page *page; | |
1812 | u64 start; | |
1813 | u64 len; | |
1814 | u64 logical; | |
1815 | unsigned long bio_flags; | |
1816 | int this_mirror; | |
1817 | int failed_mirror; | |
1818 | int in_validation; | |
1819 | }; | |
1820 | ||
1821 | static int free_io_failure(struct inode *inode, struct io_failure_record *rec, | |
1822 | int did_repair) | |
1823 | { | |
1824 | int ret; | |
1825 | int err = 0; | |
1826 | struct extent_io_tree *failure_tree = &BTRFS_I(inode)->io_failure_tree; | |
1827 | ||
1828 | set_state_private(failure_tree, rec->start, 0); | |
1829 | ret = clear_extent_bits(failure_tree, rec->start, | |
1830 | rec->start + rec->len - 1, | |
1831 | EXTENT_LOCKED | EXTENT_DIRTY, GFP_NOFS); | |
1832 | if (ret) | |
1833 | err = ret; | |
1834 | ||
1835 | if (did_repair) { | |
1836 | ret = clear_extent_bits(&BTRFS_I(inode)->io_tree, rec->start, | |
1837 | rec->start + rec->len - 1, | |
1838 | EXTENT_DAMAGED, GFP_NOFS); | |
1839 | if (ret && !err) | |
1840 | err = ret; | |
1841 | } | |
1842 | ||
1843 | kfree(rec); | |
1844 | return err; | |
1845 | } | |
1846 | ||
1847 | static void repair_io_failure_callback(struct bio *bio, int err) | |
1848 | { | |
1849 | complete(bio->bi_private); | |
1850 | } | |
1851 | ||
1852 | /* | |
1853 | * this bypasses the standard btrfs submit functions deliberately, as | |
1854 | * the standard behavior is to write all copies in a raid setup. here we only | |
1855 | * want to write the one bad copy. so we do the mapping for ourselves and issue | |
1856 | * submit_bio directly. | |
1857 | * to avoid any synchonization issues, wait for the data after writing, which | |
1858 | * actually prevents the read that triggered the error from finishing. | |
1859 | * currently, there can be no more than two copies of every data bit. thus, | |
1860 | * exactly one rewrite is required. | |
1861 | */ | |
1862 | int repair_io_failure(struct btrfs_mapping_tree *map_tree, u64 start, | |
1863 | u64 length, u64 logical, struct page *page, | |
1864 | int mirror_num) | |
1865 | { | |
1866 | struct bio *bio; | |
1867 | struct btrfs_device *dev; | |
1868 | DECLARE_COMPLETION_ONSTACK(compl); | |
1869 | u64 map_length = 0; | |
1870 | u64 sector; | |
1871 | struct btrfs_bio *bbio = NULL; | |
1872 | int ret; | |
1873 | ||
1874 | BUG_ON(!mirror_num); | |
1875 | ||
1876 | bio = bio_alloc(GFP_NOFS, 1); | |
1877 | if (!bio) | |
1878 | return -EIO; | |
1879 | bio->bi_private = &compl; | |
1880 | bio->bi_end_io = repair_io_failure_callback; | |
1881 | bio->bi_size = 0; | |
1882 | map_length = length; | |
1883 | ||
1884 | ret = btrfs_map_block(map_tree, WRITE, logical, | |
1885 | &map_length, &bbio, mirror_num); | |
1886 | if (ret) { | |
1887 | bio_put(bio); | |
1888 | return -EIO; | |
1889 | } | |
1890 | BUG_ON(mirror_num != bbio->mirror_num); | |
1891 | sector = bbio->stripes[mirror_num-1].physical >> 9; | |
1892 | bio->bi_sector = sector; | |
1893 | dev = bbio->stripes[mirror_num-1].dev; | |
1894 | kfree(bbio); | |
1895 | if (!dev || !dev->bdev || !dev->writeable) { | |
1896 | bio_put(bio); | |
1897 | return -EIO; | |
1898 | } | |
1899 | bio->bi_bdev = dev->bdev; | |
1900 | bio_add_page(bio, page, length, start-page_offset(page)); | |
21adbd5c | 1901 | btrfsic_submit_bio(WRITE_SYNC, bio); |
4a54c8c1 JS |
1902 | wait_for_completion(&compl); |
1903 | ||
1904 | if (!test_bit(BIO_UPTODATE, &bio->bi_flags)) { | |
1905 | /* try to remap that extent elsewhere? */ | |
1906 | bio_put(bio); | |
1907 | return -EIO; | |
1908 | } | |
1909 | ||
1910 | printk(KERN_INFO "btrfs read error corrected: ino %lu off %llu (dev %s " | |
1911 | "sector %llu)\n", page->mapping->host->i_ino, start, | |
1912 | dev->name, sector); | |
1913 | ||
1914 | bio_put(bio); | |
1915 | return 0; | |
1916 | } | |
1917 | ||
ea466794 JB |
1918 | int repair_eb_io_failure(struct btrfs_root *root, struct extent_buffer *eb, |
1919 | int mirror_num) | |
1920 | { | |
1921 | struct btrfs_mapping_tree *map_tree = &root->fs_info->mapping_tree; | |
1922 | u64 start = eb->start; | |
1923 | unsigned long i, num_pages = num_extent_pages(eb->start, eb->len); | |
1924 | int ret; | |
1925 | ||
1926 | for (i = 0; i < num_pages; i++) { | |
1927 | struct page *p = extent_buffer_page(eb, i); | |
1928 | ret = repair_io_failure(map_tree, start, PAGE_CACHE_SIZE, | |
1929 | start, p, mirror_num); | |
1930 | if (ret) | |
1931 | break; | |
1932 | start += PAGE_CACHE_SIZE; | |
1933 | } | |
1934 | ||
1935 | return ret; | |
1936 | } | |
1937 | ||
4a54c8c1 JS |
1938 | /* |
1939 | * each time an IO finishes, we do a fast check in the IO failure tree | |
1940 | * to see if we need to process or clean up an io_failure_record | |
1941 | */ | |
1942 | static int clean_io_failure(u64 start, struct page *page) | |
1943 | { | |
1944 | u64 private; | |
1945 | u64 private_failure; | |
1946 | struct io_failure_record *failrec; | |
1947 | struct btrfs_mapping_tree *map_tree; | |
1948 | struct extent_state *state; | |
1949 | int num_copies; | |
1950 | int did_repair = 0; | |
1951 | int ret; | |
1952 | struct inode *inode = page->mapping->host; | |
1953 | ||
1954 | private = 0; | |
1955 | ret = count_range_bits(&BTRFS_I(inode)->io_failure_tree, &private, | |
1956 | (u64)-1, 1, EXTENT_DIRTY, 0); | |
1957 | if (!ret) | |
1958 | return 0; | |
1959 | ||
1960 | ret = get_state_private(&BTRFS_I(inode)->io_failure_tree, start, | |
1961 | &private_failure); | |
1962 | if (ret) | |
1963 | return 0; | |
1964 | ||
1965 | failrec = (struct io_failure_record *)(unsigned long) private_failure; | |
1966 | BUG_ON(!failrec->this_mirror); | |
1967 | ||
1968 | if (failrec->in_validation) { | |
1969 | /* there was no real error, just free the record */ | |
1970 | pr_debug("clean_io_failure: freeing dummy error at %llu\n", | |
1971 | failrec->start); | |
1972 | did_repair = 1; | |
1973 | goto out; | |
1974 | } | |
1975 | ||
1976 | spin_lock(&BTRFS_I(inode)->io_tree.lock); | |
1977 | state = find_first_extent_bit_state(&BTRFS_I(inode)->io_tree, | |
1978 | failrec->start, | |
1979 | EXTENT_LOCKED); | |
1980 | spin_unlock(&BTRFS_I(inode)->io_tree.lock); | |
1981 | ||
1982 | if (state && state->start == failrec->start) { | |
1983 | map_tree = &BTRFS_I(inode)->root->fs_info->mapping_tree; | |
1984 | num_copies = btrfs_num_copies(map_tree, failrec->logical, | |
1985 | failrec->len); | |
1986 | if (num_copies > 1) { | |
1987 | ret = repair_io_failure(map_tree, start, failrec->len, | |
1988 | failrec->logical, page, | |
1989 | failrec->failed_mirror); | |
1990 | did_repair = !ret; | |
1991 | } | |
1992 | } | |
1993 | ||
1994 | out: | |
1995 | if (!ret) | |
1996 | ret = free_io_failure(inode, failrec, did_repair); | |
1997 | ||
1998 | return ret; | |
1999 | } | |
2000 | ||
2001 | /* | |
2002 | * this is a generic handler for readpage errors (default | |
2003 | * readpage_io_failed_hook). if other copies exist, read those and write back | |
2004 | * good data to the failed position. does not investigate in remapping the | |
2005 | * failed extent elsewhere, hoping the device will be smart enough to do this as | |
2006 | * needed | |
2007 | */ | |
2008 | ||
2009 | static int bio_readpage_error(struct bio *failed_bio, struct page *page, | |
2010 | u64 start, u64 end, int failed_mirror, | |
2011 | struct extent_state *state) | |
2012 | { | |
2013 | struct io_failure_record *failrec = NULL; | |
2014 | u64 private; | |
2015 | struct extent_map *em; | |
2016 | struct inode *inode = page->mapping->host; | |
2017 | struct extent_io_tree *failure_tree = &BTRFS_I(inode)->io_failure_tree; | |
2018 | struct extent_io_tree *tree = &BTRFS_I(inode)->io_tree; | |
2019 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; | |
2020 | struct bio *bio; | |
2021 | int num_copies; | |
2022 | int ret; | |
2023 | int read_mode; | |
2024 | u64 logical; | |
2025 | ||
2026 | BUG_ON(failed_bio->bi_rw & REQ_WRITE); | |
2027 | ||
2028 | ret = get_state_private(failure_tree, start, &private); | |
2029 | if (ret) { | |
2030 | failrec = kzalloc(sizeof(*failrec), GFP_NOFS); | |
2031 | if (!failrec) | |
2032 | return -ENOMEM; | |
2033 | failrec->start = start; | |
2034 | failrec->len = end - start + 1; | |
2035 | failrec->this_mirror = 0; | |
2036 | failrec->bio_flags = 0; | |
2037 | failrec->in_validation = 0; | |
2038 | ||
2039 | read_lock(&em_tree->lock); | |
2040 | em = lookup_extent_mapping(em_tree, start, failrec->len); | |
2041 | if (!em) { | |
2042 | read_unlock(&em_tree->lock); | |
2043 | kfree(failrec); | |
2044 | return -EIO; | |
2045 | } | |
2046 | ||
2047 | if (em->start > start || em->start + em->len < start) { | |
2048 | free_extent_map(em); | |
2049 | em = NULL; | |
2050 | } | |
2051 | read_unlock(&em_tree->lock); | |
2052 | ||
2053 | if (!em || IS_ERR(em)) { | |
2054 | kfree(failrec); | |
2055 | return -EIO; | |
2056 | } | |
2057 | logical = start - em->start; | |
2058 | logical = em->block_start + logical; | |
2059 | if (test_bit(EXTENT_FLAG_COMPRESSED, &em->flags)) { | |
2060 | logical = em->block_start; | |
2061 | failrec->bio_flags = EXTENT_BIO_COMPRESSED; | |
2062 | extent_set_compress_type(&failrec->bio_flags, | |
2063 | em->compress_type); | |
2064 | } | |
2065 | pr_debug("bio_readpage_error: (new) logical=%llu, start=%llu, " | |
2066 | "len=%llu\n", logical, start, failrec->len); | |
2067 | failrec->logical = logical; | |
2068 | free_extent_map(em); | |
2069 | ||
2070 | /* set the bits in the private failure tree */ | |
2071 | ret = set_extent_bits(failure_tree, start, end, | |
2072 | EXTENT_LOCKED | EXTENT_DIRTY, GFP_NOFS); | |
2073 | if (ret >= 0) | |
2074 | ret = set_state_private(failure_tree, start, | |
2075 | (u64)(unsigned long)failrec); | |
2076 | /* set the bits in the inode's tree */ | |
2077 | if (ret >= 0) | |
2078 | ret = set_extent_bits(tree, start, end, EXTENT_DAMAGED, | |
2079 | GFP_NOFS); | |
2080 | if (ret < 0) { | |
2081 | kfree(failrec); | |
2082 | return ret; | |
2083 | } | |
2084 | } else { | |
2085 | failrec = (struct io_failure_record *)(unsigned long)private; | |
2086 | pr_debug("bio_readpage_error: (found) logical=%llu, " | |
2087 | "start=%llu, len=%llu, validation=%d\n", | |
2088 | failrec->logical, failrec->start, failrec->len, | |
2089 | failrec->in_validation); | |
2090 | /* | |
2091 | * when data can be on disk more than twice, add to failrec here | |
2092 | * (e.g. with a list for failed_mirror) to make | |
2093 | * clean_io_failure() clean all those errors at once. | |
2094 | */ | |
2095 | } | |
2096 | num_copies = btrfs_num_copies( | |
2097 | &BTRFS_I(inode)->root->fs_info->mapping_tree, | |
2098 | failrec->logical, failrec->len); | |
2099 | if (num_copies == 1) { | |
2100 | /* | |
2101 | * we only have a single copy of the data, so don't bother with | |
2102 | * all the retry and error correction code that follows. no | |
2103 | * matter what the error is, it is very likely to persist. | |
2104 | */ | |
2105 | pr_debug("bio_readpage_error: cannot repair, num_copies == 1. " | |
2106 | "state=%p, num_copies=%d, next_mirror %d, " | |
2107 | "failed_mirror %d\n", state, num_copies, | |
2108 | failrec->this_mirror, failed_mirror); | |
2109 | free_io_failure(inode, failrec, 0); | |
2110 | return -EIO; | |
2111 | } | |
2112 | ||
2113 | if (!state) { | |
2114 | spin_lock(&tree->lock); | |
2115 | state = find_first_extent_bit_state(tree, failrec->start, | |
2116 | EXTENT_LOCKED); | |
2117 | if (state && state->start != failrec->start) | |
2118 | state = NULL; | |
2119 | spin_unlock(&tree->lock); | |
2120 | } | |
2121 | ||
2122 | /* | |
2123 | * there are two premises: | |
2124 | * a) deliver good data to the caller | |
2125 | * b) correct the bad sectors on disk | |
2126 | */ | |
2127 | if (failed_bio->bi_vcnt > 1) { | |
2128 | /* | |
2129 | * to fulfill b), we need to know the exact failing sectors, as | |
2130 | * we don't want to rewrite any more than the failed ones. thus, | |
2131 | * we need separate read requests for the failed bio | |
2132 | * | |
2133 | * if the following BUG_ON triggers, our validation request got | |
2134 | * merged. we need separate requests for our algorithm to work. | |
2135 | */ | |
2136 | BUG_ON(failrec->in_validation); | |
2137 | failrec->in_validation = 1; | |
2138 | failrec->this_mirror = failed_mirror; | |
2139 | read_mode = READ_SYNC | REQ_FAILFAST_DEV; | |
2140 | } else { | |
2141 | /* | |
2142 | * we're ready to fulfill a) and b) alongside. get a good copy | |
2143 | * of the failed sector and if we succeed, we have setup | |
2144 | * everything for repair_io_failure to do the rest for us. | |
2145 | */ | |
2146 | if (failrec->in_validation) { | |
2147 | BUG_ON(failrec->this_mirror != failed_mirror); | |
2148 | failrec->in_validation = 0; | |
2149 | failrec->this_mirror = 0; | |
2150 | } | |
2151 | failrec->failed_mirror = failed_mirror; | |
2152 | failrec->this_mirror++; | |
2153 | if (failrec->this_mirror == failed_mirror) | |
2154 | failrec->this_mirror++; | |
2155 | read_mode = READ_SYNC; | |
2156 | } | |
2157 | ||
2158 | if (!state || failrec->this_mirror > num_copies) { | |
2159 | pr_debug("bio_readpage_error: (fail) state=%p, num_copies=%d, " | |
2160 | "next_mirror %d, failed_mirror %d\n", state, | |
2161 | num_copies, failrec->this_mirror, failed_mirror); | |
2162 | free_io_failure(inode, failrec, 0); | |
2163 | return -EIO; | |
2164 | } | |
2165 | ||
2166 | bio = bio_alloc(GFP_NOFS, 1); | |
2167 | bio->bi_private = state; | |
2168 | bio->bi_end_io = failed_bio->bi_end_io; | |
2169 | bio->bi_sector = failrec->logical >> 9; | |
2170 | bio->bi_bdev = BTRFS_I(inode)->root->fs_info->fs_devices->latest_bdev; | |
2171 | bio->bi_size = 0; | |
2172 | ||
2173 | bio_add_page(bio, page, failrec->len, start - page_offset(page)); | |
2174 | ||
2175 | pr_debug("bio_readpage_error: submitting new read[%#x] to " | |
2176 | "this_mirror=%d, num_copies=%d, in_validation=%d\n", read_mode, | |
2177 | failrec->this_mirror, num_copies, failrec->in_validation); | |
2178 | ||
013bd4c3 TI |
2179 | ret = tree->ops->submit_bio_hook(inode, read_mode, bio, |
2180 | failrec->this_mirror, | |
2181 | failrec->bio_flags, 0); | |
2182 | return ret; | |
4a54c8c1 JS |
2183 | } |
2184 | ||
d1310b2e CM |
2185 | /* lots and lots of room for performance fixes in the end_bio funcs */ |
2186 | ||
87826df0 JM |
2187 | int end_extent_writepage(struct page *page, int err, u64 start, u64 end) |
2188 | { | |
2189 | int uptodate = (err == 0); | |
2190 | struct extent_io_tree *tree; | |
2191 | int ret; | |
2192 | ||
2193 | tree = &BTRFS_I(page->mapping->host)->io_tree; | |
2194 | ||
2195 | if (tree->ops && tree->ops->writepage_end_io_hook) { | |
2196 | ret = tree->ops->writepage_end_io_hook(page, start, | |
2197 | end, NULL, uptodate); | |
2198 | if (ret) | |
2199 | uptodate = 0; | |
2200 | } | |
2201 | ||
2202 | if (!uptodate && tree->ops && | |
2203 | tree->ops->writepage_io_failed_hook) { | |
2204 | ret = tree->ops->writepage_io_failed_hook(NULL, page, | |
2205 | start, end, NULL); | |
2206 | /* Writeback already completed */ | |
2207 | if (ret == 0) | |
2208 | return 1; | |
2209 | } | |
2210 | ||
2211 | if (!uptodate) { | |
2212 | clear_extent_uptodate(tree, start, end, NULL, GFP_NOFS); | |
2213 | ClearPageUptodate(page); | |
2214 | SetPageError(page); | |
2215 | } | |
2216 | return 0; | |
2217 | } | |
2218 | ||
d1310b2e CM |
2219 | /* |
2220 | * after a writepage IO is done, we need to: | |
2221 | * clear the uptodate bits on error | |
2222 | * clear the writeback bits in the extent tree for this IO | |
2223 | * end_page_writeback if the page has no more pending IO | |
2224 | * | |
2225 | * Scheduling is not allowed, so the extent state tree is expected | |
2226 | * to have one and only one object corresponding to this IO. | |
2227 | */ | |
d1310b2e | 2228 | static void end_bio_extent_writepage(struct bio *bio, int err) |
d1310b2e | 2229 | { |
d1310b2e | 2230 | struct bio_vec *bvec = bio->bi_io_vec + bio->bi_vcnt - 1; |
902b22f3 | 2231 | struct extent_io_tree *tree; |
d1310b2e CM |
2232 | u64 start; |
2233 | u64 end; | |
2234 | int whole_page; | |
2235 | ||
d1310b2e CM |
2236 | do { |
2237 | struct page *page = bvec->bv_page; | |
902b22f3 DW |
2238 | tree = &BTRFS_I(page->mapping->host)->io_tree; |
2239 | ||
d1310b2e CM |
2240 | start = ((u64)page->index << PAGE_CACHE_SHIFT) + |
2241 | bvec->bv_offset; | |
2242 | end = start + bvec->bv_len - 1; | |
2243 | ||
2244 | if (bvec->bv_offset == 0 && bvec->bv_len == PAGE_CACHE_SIZE) | |
2245 | whole_page = 1; | |
2246 | else | |
2247 | whole_page = 0; | |
2248 | ||
2249 | if (--bvec >= bio->bi_io_vec) | |
2250 | prefetchw(&bvec->bv_page->flags); | |
1259ab75 | 2251 | |
87826df0 JM |
2252 | if (end_extent_writepage(page, err, start, end)) |
2253 | continue; | |
70dec807 | 2254 | |
d1310b2e CM |
2255 | if (whole_page) |
2256 | end_page_writeback(page); | |
2257 | else | |
2258 | check_page_writeback(tree, page); | |
d1310b2e | 2259 | } while (bvec >= bio->bi_io_vec); |
2b1f55b0 | 2260 | |
d1310b2e | 2261 | bio_put(bio); |
d1310b2e CM |
2262 | } |
2263 | ||
2264 | /* | |
2265 | * after a readpage IO is done, we need to: | |
2266 | * clear the uptodate bits on error | |
2267 | * set the uptodate bits if things worked | |
2268 | * set the page up to date if all extents in the tree are uptodate | |
2269 | * clear the lock bit in the extent tree | |
2270 | * unlock the page if there are no other extents locked for it | |
2271 | * | |
2272 | * Scheduling is not allowed, so the extent state tree is expected | |
2273 | * to have one and only one object corresponding to this IO. | |
2274 | */ | |
d1310b2e | 2275 | static void end_bio_extent_readpage(struct bio *bio, int err) |
d1310b2e CM |
2276 | { |
2277 | int uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags); | |
4125bf76 CM |
2278 | struct bio_vec *bvec_end = bio->bi_io_vec + bio->bi_vcnt - 1; |
2279 | struct bio_vec *bvec = bio->bi_io_vec; | |
902b22f3 | 2280 | struct extent_io_tree *tree; |
d1310b2e CM |
2281 | u64 start; |
2282 | u64 end; | |
2283 | int whole_page; | |
ea466794 | 2284 | int failed_mirror; |
d1310b2e CM |
2285 | int ret; |
2286 | ||
d20f7043 CM |
2287 | if (err) |
2288 | uptodate = 0; | |
2289 | ||
d1310b2e CM |
2290 | do { |
2291 | struct page *page = bvec->bv_page; | |
507903b8 AJ |
2292 | struct extent_state *cached = NULL; |
2293 | struct extent_state *state; | |
2294 | ||
4a54c8c1 JS |
2295 | pr_debug("end_bio_extent_readpage: bi_vcnt=%d, idx=%d, err=%d, " |
2296 | "mirror=%ld\n", bio->bi_vcnt, bio->bi_idx, err, | |
2297 | (long int)bio->bi_bdev); | |
902b22f3 DW |
2298 | tree = &BTRFS_I(page->mapping->host)->io_tree; |
2299 | ||
d1310b2e CM |
2300 | start = ((u64)page->index << PAGE_CACHE_SHIFT) + |
2301 | bvec->bv_offset; | |
2302 | end = start + bvec->bv_len - 1; | |
2303 | ||
2304 | if (bvec->bv_offset == 0 && bvec->bv_len == PAGE_CACHE_SIZE) | |
2305 | whole_page = 1; | |
2306 | else | |
2307 | whole_page = 0; | |
2308 | ||
4125bf76 | 2309 | if (++bvec <= bvec_end) |
d1310b2e CM |
2310 | prefetchw(&bvec->bv_page->flags); |
2311 | ||
507903b8 | 2312 | spin_lock(&tree->lock); |
0d399205 | 2313 | state = find_first_extent_bit_state(tree, start, EXTENT_LOCKED); |
109b36a2 | 2314 | if (state && state->start == start) { |
507903b8 AJ |
2315 | /* |
2316 | * take a reference on the state, unlock will drop | |
2317 | * the ref | |
2318 | */ | |
2319 | cache_state(state, &cached); | |
2320 | } | |
2321 | spin_unlock(&tree->lock); | |
2322 | ||
d1310b2e | 2323 | if (uptodate && tree->ops && tree->ops->readpage_end_io_hook) { |
70dec807 | 2324 | ret = tree->ops->readpage_end_io_hook(page, start, end, |
507903b8 | 2325 | state); |
d1310b2e CM |
2326 | if (ret) |
2327 | uptodate = 0; | |
4a54c8c1 JS |
2328 | else |
2329 | clean_io_failure(start, page); | |
d1310b2e | 2330 | } |
ea466794 JB |
2331 | |
2332 | if (!uptodate) | |
32240a91 | 2333 | failed_mirror = (int)(unsigned long)bio->bi_bdev; |
ea466794 JB |
2334 | |
2335 | if (!uptodate && tree->ops && tree->ops->readpage_io_failed_hook) { | |
2336 | ret = tree->ops->readpage_io_failed_hook(page, failed_mirror); | |
2337 | if (!ret && !err && | |
2338 | test_bit(BIO_UPTODATE, &bio->bi_flags)) | |
2339 | uptodate = 1; | |
2340 | } else if (!uptodate) { | |
f4a8e656 JS |
2341 | /* |
2342 | * The generic bio_readpage_error handles errors the | |
2343 | * following way: If possible, new read requests are | |
2344 | * created and submitted and will end up in | |
2345 | * end_bio_extent_readpage as well (if we're lucky, not | |
2346 | * in the !uptodate case). In that case it returns 0 and | |
2347 | * we just go on with the next page in our bio. If it | |
2348 | * can't handle the error it will return -EIO and we | |
2349 | * remain responsible for that page. | |
2350 | */ | |
2351 | ret = bio_readpage_error(bio, page, start, end, | |
2352 | failed_mirror, NULL); | |
7e38326f | 2353 | if (ret == 0) { |
3b951516 CM |
2354 | uptodate = |
2355 | test_bit(BIO_UPTODATE, &bio->bi_flags); | |
d20f7043 CM |
2356 | if (err) |
2357 | uptodate = 0; | |
507903b8 | 2358 | uncache_state(&cached); |
7e38326f CM |
2359 | continue; |
2360 | } | |
2361 | } | |
d1310b2e | 2362 | |
0b32f4bb | 2363 | if (uptodate && tree->track_uptodate) { |
507903b8 | 2364 | set_extent_uptodate(tree, start, end, &cached, |
902b22f3 | 2365 | GFP_ATOMIC); |
771ed689 | 2366 | } |
507903b8 | 2367 | unlock_extent_cached(tree, start, end, &cached, GFP_ATOMIC); |
d1310b2e | 2368 | |
70dec807 CM |
2369 | if (whole_page) { |
2370 | if (uptodate) { | |
2371 | SetPageUptodate(page); | |
2372 | } else { | |
2373 | ClearPageUptodate(page); | |
2374 | SetPageError(page); | |
2375 | } | |
d1310b2e | 2376 | unlock_page(page); |
70dec807 CM |
2377 | } else { |
2378 | if (uptodate) { | |
2379 | check_page_uptodate(tree, page); | |
2380 | } else { | |
2381 | ClearPageUptodate(page); | |
2382 | SetPageError(page); | |
2383 | } | |
d1310b2e | 2384 | check_page_locked(tree, page); |
70dec807 | 2385 | } |
4125bf76 | 2386 | } while (bvec <= bvec_end); |
d1310b2e CM |
2387 | |
2388 | bio_put(bio); | |
d1310b2e CM |
2389 | } |
2390 | ||
88f794ed MX |
2391 | struct bio * |
2392 | btrfs_bio_alloc(struct block_device *bdev, u64 first_sector, int nr_vecs, | |
2393 | gfp_t gfp_flags) | |
d1310b2e CM |
2394 | { |
2395 | struct bio *bio; | |
2396 | ||
2397 | bio = bio_alloc(gfp_flags, nr_vecs); | |
2398 | ||
2399 | if (bio == NULL && (current->flags & PF_MEMALLOC)) { | |
2400 | while (!bio && (nr_vecs /= 2)) | |
2401 | bio = bio_alloc(gfp_flags, nr_vecs); | |
2402 | } | |
2403 | ||
2404 | if (bio) { | |
e1c4b745 | 2405 | bio->bi_size = 0; |
d1310b2e CM |
2406 | bio->bi_bdev = bdev; |
2407 | bio->bi_sector = first_sector; | |
2408 | } | |
2409 | return bio; | |
2410 | } | |
2411 | ||
c8b97818 CM |
2412 | static int submit_one_bio(int rw, struct bio *bio, int mirror_num, |
2413 | unsigned long bio_flags) | |
d1310b2e | 2414 | { |
d1310b2e | 2415 | int ret = 0; |
70dec807 CM |
2416 | struct bio_vec *bvec = bio->bi_io_vec + bio->bi_vcnt - 1; |
2417 | struct page *page = bvec->bv_page; | |
2418 | struct extent_io_tree *tree = bio->bi_private; | |
70dec807 | 2419 | u64 start; |
70dec807 CM |
2420 | |
2421 | start = ((u64)page->index << PAGE_CACHE_SHIFT) + bvec->bv_offset; | |
70dec807 | 2422 | |
902b22f3 | 2423 | bio->bi_private = NULL; |
d1310b2e CM |
2424 | |
2425 | bio_get(bio); | |
2426 | ||
065631f6 | 2427 | if (tree->ops && tree->ops->submit_bio_hook) |
6b82ce8d | 2428 | ret = tree->ops->submit_bio_hook(page->mapping->host, rw, bio, |
eaf25d93 | 2429 | mirror_num, bio_flags, start); |
0b86a832 | 2430 | else |
21adbd5c | 2431 | btrfsic_submit_bio(rw, bio); |
4a54c8c1 | 2432 | |
d1310b2e CM |
2433 | if (bio_flagged(bio, BIO_EOPNOTSUPP)) |
2434 | ret = -EOPNOTSUPP; | |
2435 | bio_put(bio); | |
2436 | return ret; | |
2437 | } | |
2438 | ||
2439 | static int submit_extent_page(int rw, struct extent_io_tree *tree, | |
2440 | struct page *page, sector_t sector, | |
2441 | size_t size, unsigned long offset, | |
2442 | struct block_device *bdev, | |
2443 | struct bio **bio_ret, | |
2444 | unsigned long max_pages, | |
f188591e | 2445 | bio_end_io_t end_io_func, |
c8b97818 CM |
2446 | int mirror_num, |
2447 | unsigned long prev_bio_flags, | |
2448 | unsigned long bio_flags) | |
d1310b2e CM |
2449 | { |
2450 | int ret = 0; | |
2451 | struct bio *bio; | |
2452 | int nr; | |
c8b97818 CM |
2453 | int contig = 0; |
2454 | int this_compressed = bio_flags & EXTENT_BIO_COMPRESSED; | |
2455 | int old_compressed = prev_bio_flags & EXTENT_BIO_COMPRESSED; | |
5b050f04 | 2456 | size_t page_size = min_t(size_t, size, PAGE_CACHE_SIZE); |
d1310b2e CM |
2457 | |
2458 | if (bio_ret && *bio_ret) { | |
2459 | bio = *bio_ret; | |
c8b97818 CM |
2460 | if (old_compressed) |
2461 | contig = bio->bi_sector == sector; | |
2462 | else | |
2463 | contig = bio->bi_sector + (bio->bi_size >> 9) == | |
2464 | sector; | |
2465 | ||
2466 | if (prev_bio_flags != bio_flags || !contig || | |
239b14b3 | 2467 | (tree->ops && tree->ops->merge_bio_hook && |
c8b97818 CM |
2468 | tree->ops->merge_bio_hook(page, offset, page_size, bio, |
2469 | bio_flags)) || | |
2470 | bio_add_page(bio, page, page_size, offset) < page_size) { | |
2471 | ret = submit_one_bio(rw, bio, mirror_num, | |
2472 | prev_bio_flags); | |
d1310b2e CM |
2473 | bio = NULL; |
2474 | } else { | |
2475 | return 0; | |
2476 | } | |
2477 | } | |
c8b97818 CM |
2478 | if (this_compressed) |
2479 | nr = BIO_MAX_PAGES; | |
2480 | else | |
2481 | nr = bio_get_nr_vecs(bdev); | |
2482 | ||
88f794ed | 2483 | bio = btrfs_bio_alloc(bdev, sector, nr, GFP_NOFS | __GFP_HIGH); |
5df67083 TI |
2484 | if (!bio) |
2485 | return -ENOMEM; | |
70dec807 | 2486 | |
c8b97818 | 2487 | bio_add_page(bio, page, page_size, offset); |
d1310b2e CM |
2488 | bio->bi_end_io = end_io_func; |
2489 | bio->bi_private = tree; | |
70dec807 | 2490 | |
d397712b | 2491 | if (bio_ret) |
d1310b2e | 2492 | *bio_ret = bio; |
d397712b | 2493 | else |
c8b97818 | 2494 | ret = submit_one_bio(rw, bio, mirror_num, bio_flags); |
d1310b2e CM |
2495 | |
2496 | return ret; | |
2497 | } | |
2498 | ||
4f2de97a | 2499 | void attach_extent_buffer_page(struct extent_buffer *eb, struct page *page) |
d1310b2e CM |
2500 | { |
2501 | if (!PagePrivate(page)) { | |
2502 | SetPagePrivate(page); | |
d1310b2e | 2503 | page_cache_get(page); |
4f2de97a JB |
2504 | set_page_private(page, (unsigned long)eb); |
2505 | } else { | |
2506 | WARN_ON(page->private != (unsigned long)eb); | |
d1310b2e CM |
2507 | } |
2508 | } | |
2509 | ||
4f2de97a | 2510 | void set_page_extent_mapped(struct page *page) |
d1310b2e | 2511 | { |
4f2de97a JB |
2512 | if (!PagePrivate(page)) { |
2513 | SetPagePrivate(page); | |
2514 | page_cache_get(page); | |
2515 | set_page_private(page, EXTENT_PAGE_PRIVATE); | |
2516 | } | |
d1310b2e CM |
2517 | } |
2518 | ||
2519 | /* | |
2520 | * basic readpage implementation. Locked extent state structs are inserted | |
2521 | * into the tree that are removed when the IO is done (by the end_io | |
2522 | * handlers) | |
2523 | */ | |
2524 | static int __extent_read_full_page(struct extent_io_tree *tree, | |
2525 | struct page *page, | |
2526 | get_extent_t *get_extent, | |
c8b97818 CM |
2527 | struct bio **bio, int mirror_num, |
2528 | unsigned long *bio_flags) | |
d1310b2e CM |
2529 | { |
2530 | struct inode *inode = page->mapping->host; | |
2531 | u64 start = (u64)page->index << PAGE_CACHE_SHIFT; | |
2532 | u64 page_end = start + PAGE_CACHE_SIZE - 1; | |
2533 | u64 end; | |
2534 | u64 cur = start; | |
2535 | u64 extent_offset; | |
2536 | u64 last_byte = i_size_read(inode); | |
2537 | u64 block_start; | |
2538 | u64 cur_end; | |
2539 | sector_t sector; | |
2540 | struct extent_map *em; | |
2541 | struct block_device *bdev; | |
11c65dcc | 2542 | struct btrfs_ordered_extent *ordered; |
d1310b2e CM |
2543 | int ret; |
2544 | int nr = 0; | |
306e16ce | 2545 | size_t pg_offset = 0; |
d1310b2e | 2546 | size_t iosize; |
c8b97818 | 2547 | size_t disk_io_size; |
d1310b2e | 2548 | size_t blocksize = inode->i_sb->s_blocksize; |
c8b97818 | 2549 | unsigned long this_bio_flag = 0; |
d1310b2e CM |
2550 | |
2551 | set_page_extent_mapped(page); | |
2552 | ||
90a887c9 DM |
2553 | if (!PageUptodate(page)) { |
2554 | if (cleancache_get_page(page) == 0) { | |
2555 | BUG_ON(blocksize != PAGE_SIZE); | |
2556 | goto out; | |
2557 | } | |
2558 | } | |
2559 | ||
d1310b2e | 2560 | end = page_end; |
11c65dcc JB |
2561 | while (1) { |
2562 | lock_extent(tree, start, end, GFP_NOFS); | |
2563 | ordered = btrfs_lookup_ordered_extent(inode, start); | |
2564 | if (!ordered) | |
2565 | break; | |
2566 | unlock_extent(tree, start, end, GFP_NOFS); | |
2567 | btrfs_start_ordered_extent(inode, ordered, 1); | |
2568 | btrfs_put_ordered_extent(ordered); | |
2569 | } | |
d1310b2e | 2570 | |
c8b97818 CM |
2571 | if (page->index == last_byte >> PAGE_CACHE_SHIFT) { |
2572 | char *userpage; | |
2573 | size_t zero_offset = last_byte & (PAGE_CACHE_SIZE - 1); | |
2574 | ||
2575 | if (zero_offset) { | |
2576 | iosize = PAGE_CACHE_SIZE - zero_offset; | |
2577 | userpage = kmap_atomic(page, KM_USER0); | |
2578 | memset(userpage + zero_offset, 0, iosize); | |
2579 | flush_dcache_page(page); | |
2580 | kunmap_atomic(userpage, KM_USER0); | |
2581 | } | |
2582 | } | |
d1310b2e CM |
2583 | while (cur <= end) { |
2584 | if (cur >= last_byte) { | |
2585 | char *userpage; | |
507903b8 AJ |
2586 | struct extent_state *cached = NULL; |
2587 | ||
306e16ce | 2588 | iosize = PAGE_CACHE_SIZE - pg_offset; |
d1310b2e | 2589 | userpage = kmap_atomic(page, KM_USER0); |
306e16ce | 2590 | memset(userpage + pg_offset, 0, iosize); |
d1310b2e CM |
2591 | flush_dcache_page(page); |
2592 | kunmap_atomic(userpage, KM_USER0); | |
2593 | set_extent_uptodate(tree, cur, cur + iosize - 1, | |
507903b8 AJ |
2594 | &cached, GFP_NOFS); |
2595 | unlock_extent_cached(tree, cur, cur + iosize - 1, | |
2596 | &cached, GFP_NOFS); | |
d1310b2e CM |
2597 | break; |
2598 | } | |
306e16ce | 2599 | em = get_extent(inode, page, pg_offset, cur, |
d1310b2e | 2600 | end - cur + 1, 0); |
c704005d | 2601 | if (IS_ERR_OR_NULL(em)) { |
d1310b2e CM |
2602 | SetPageError(page); |
2603 | unlock_extent(tree, cur, end, GFP_NOFS); | |
2604 | break; | |
2605 | } | |
d1310b2e CM |
2606 | extent_offset = cur - em->start; |
2607 | BUG_ON(extent_map_end(em) <= cur); | |
2608 | BUG_ON(end < cur); | |
2609 | ||
261507a0 | 2610 | if (test_bit(EXTENT_FLAG_COMPRESSED, &em->flags)) { |
c8b97818 | 2611 | this_bio_flag = EXTENT_BIO_COMPRESSED; |
261507a0 LZ |
2612 | extent_set_compress_type(&this_bio_flag, |
2613 | em->compress_type); | |
2614 | } | |
c8b97818 | 2615 | |
d1310b2e CM |
2616 | iosize = min(extent_map_end(em) - cur, end - cur + 1); |
2617 | cur_end = min(extent_map_end(em) - 1, end); | |
2618 | iosize = (iosize + blocksize - 1) & ~((u64)blocksize - 1); | |
c8b97818 CM |
2619 | if (this_bio_flag & EXTENT_BIO_COMPRESSED) { |
2620 | disk_io_size = em->block_len; | |
2621 | sector = em->block_start >> 9; | |
2622 | } else { | |
2623 | sector = (em->block_start + extent_offset) >> 9; | |
2624 | disk_io_size = iosize; | |
2625 | } | |
d1310b2e CM |
2626 | bdev = em->bdev; |
2627 | block_start = em->block_start; | |
d899e052 YZ |
2628 | if (test_bit(EXTENT_FLAG_PREALLOC, &em->flags)) |
2629 | block_start = EXTENT_MAP_HOLE; | |
d1310b2e CM |
2630 | free_extent_map(em); |
2631 | em = NULL; | |
2632 | ||
2633 | /* we've found a hole, just zero and go on */ | |
2634 | if (block_start == EXTENT_MAP_HOLE) { | |
2635 | char *userpage; | |
507903b8 AJ |
2636 | struct extent_state *cached = NULL; |
2637 | ||
d1310b2e | 2638 | userpage = kmap_atomic(page, KM_USER0); |
306e16ce | 2639 | memset(userpage + pg_offset, 0, iosize); |
d1310b2e CM |
2640 | flush_dcache_page(page); |
2641 | kunmap_atomic(userpage, KM_USER0); | |
2642 | ||
2643 | set_extent_uptodate(tree, cur, cur + iosize - 1, | |
507903b8 AJ |
2644 | &cached, GFP_NOFS); |
2645 | unlock_extent_cached(tree, cur, cur + iosize - 1, | |
2646 | &cached, GFP_NOFS); | |
d1310b2e | 2647 | cur = cur + iosize; |
306e16ce | 2648 | pg_offset += iosize; |
d1310b2e CM |
2649 | continue; |
2650 | } | |
2651 | /* the get_extent function already copied into the page */ | |
9655d298 CM |
2652 | if (test_range_bit(tree, cur, cur_end, |
2653 | EXTENT_UPTODATE, 1, NULL)) { | |
a1b32a59 | 2654 | check_page_uptodate(tree, page); |
d1310b2e CM |
2655 | unlock_extent(tree, cur, cur + iosize - 1, GFP_NOFS); |
2656 | cur = cur + iosize; | |
306e16ce | 2657 | pg_offset += iosize; |
d1310b2e CM |
2658 | continue; |
2659 | } | |
70dec807 CM |
2660 | /* we have an inline extent but it didn't get marked up |
2661 | * to date. Error out | |
2662 | */ | |
2663 | if (block_start == EXTENT_MAP_INLINE) { | |
2664 | SetPageError(page); | |
2665 | unlock_extent(tree, cur, cur + iosize - 1, GFP_NOFS); | |
2666 | cur = cur + iosize; | |
306e16ce | 2667 | pg_offset += iosize; |
70dec807 CM |
2668 | continue; |
2669 | } | |
d1310b2e CM |
2670 | |
2671 | ret = 0; | |
2672 | if (tree->ops && tree->ops->readpage_io_hook) { | |
2673 | ret = tree->ops->readpage_io_hook(page, cur, | |
2674 | cur + iosize - 1); | |
2675 | } | |
2676 | if (!ret) { | |
89642229 CM |
2677 | unsigned long pnr = (last_byte >> PAGE_CACHE_SHIFT) + 1; |
2678 | pnr -= page->index; | |
d1310b2e | 2679 | ret = submit_extent_page(READ, tree, page, |
306e16ce | 2680 | sector, disk_io_size, pg_offset, |
89642229 | 2681 | bdev, bio, pnr, |
c8b97818 CM |
2682 | end_bio_extent_readpage, mirror_num, |
2683 | *bio_flags, | |
2684 | this_bio_flag); | |
89642229 | 2685 | nr++; |
c8b97818 | 2686 | *bio_flags = this_bio_flag; |
d1310b2e CM |
2687 | } |
2688 | if (ret) | |
2689 | SetPageError(page); | |
2690 | cur = cur + iosize; | |
306e16ce | 2691 | pg_offset += iosize; |
d1310b2e | 2692 | } |
90a887c9 | 2693 | out: |
d1310b2e CM |
2694 | if (!nr) { |
2695 | if (!PageError(page)) | |
2696 | SetPageUptodate(page); | |
2697 | unlock_page(page); | |
2698 | } | |
2699 | return 0; | |
2700 | } | |
2701 | ||
2702 | int extent_read_full_page(struct extent_io_tree *tree, struct page *page, | |
8ddc7d9c | 2703 | get_extent_t *get_extent, int mirror_num) |
d1310b2e CM |
2704 | { |
2705 | struct bio *bio = NULL; | |
c8b97818 | 2706 | unsigned long bio_flags = 0; |
d1310b2e CM |
2707 | int ret; |
2708 | ||
8ddc7d9c | 2709 | ret = __extent_read_full_page(tree, page, get_extent, &bio, mirror_num, |
c8b97818 | 2710 | &bio_flags); |
d1310b2e | 2711 | if (bio) |
8ddc7d9c | 2712 | ret = submit_one_bio(READ, bio, mirror_num, bio_flags); |
d1310b2e CM |
2713 | return ret; |
2714 | } | |
d1310b2e | 2715 | |
11c8349b CM |
2716 | static noinline void update_nr_written(struct page *page, |
2717 | struct writeback_control *wbc, | |
2718 | unsigned long nr_written) | |
2719 | { | |
2720 | wbc->nr_to_write -= nr_written; | |
2721 | if (wbc->range_cyclic || (wbc->nr_to_write > 0 && | |
2722 | wbc->range_start == 0 && wbc->range_end == LLONG_MAX)) | |
2723 | page->mapping->writeback_index = page->index + nr_written; | |
2724 | } | |
2725 | ||
d1310b2e CM |
2726 | /* |
2727 | * the writepage semantics are similar to regular writepage. extent | |
2728 | * records are inserted to lock ranges in the tree, and as dirty areas | |
2729 | * are found, they are marked writeback. Then the lock bits are removed | |
2730 | * and the end_io handler clears the writeback ranges | |
2731 | */ | |
2732 | static int __extent_writepage(struct page *page, struct writeback_control *wbc, | |
2733 | void *data) | |
2734 | { | |
2735 | struct inode *inode = page->mapping->host; | |
2736 | struct extent_page_data *epd = data; | |
2737 | struct extent_io_tree *tree = epd->tree; | |
2738 | u64 start = (u64)page->index << PAGE_CACHE_SHIFT; | |
2739 | u64 delalloc_start; | |
2740 | u64 page_end = start + PAGE_CACHE_SIZE - 1; | |
2741 | u64 end; | |
2742 | u64 cur = start; | |
2743 | u64 extent_offset; | |
2744 | u64 last_byte = i_size_read(inode); | |
2745 | u64 block_start; | |
2746 | u64 iosize; | |
2747 | sector_t sector; | |
2c64c53d | 2748 | struct extent_state *cached_state = NULL; |
d1310b2e CM |
2749 | struct extent_map *em; |
2750 | struct block_device *bdev; | |
2751 | int ret; | |
2752 | int nr = 0; | |
7f3c74fb | 2753 | size_t pg_offset = 0; |
d1310b2e CM |
2754 | size_t blocksize; |
2755 | loff_t i_size = i_size_read(inode); | |
2756 | unsigned long end_index = i_size >> PAGE_CACHE_SHIFT; | |
2757 | u64 nr_delalloc; | |
2758 | u64 delalloc_end; | |
c8b97818 CM |
2759 | int page_started; |
2760 | int compressed; | |
ffbd517d | 2761 | int write_flags; |
771ed689 | 2762 | unsigned long nr_written = 0; |
9e487107 | 2763 | bool fill_delalloc = true; |
d1310b2e | 2764 | |
ffbd517d | 2765 | if (wbc->sync_mode == WB_SYNC_ALL) |
721a9602 | 2766 | write_flags = WRITE_SYNC; |
ffbd517d CM |
2767 | else |
2768 | write_flags = WRITE; | |
2769 | ||
1abe9b8a | 2770 | trace___extent_writepage(page, inode, wbc); |
2771 | ||
d1310b2e | 2772 | WARN_ON(!PageLocked(page)); |
bf0da8c1 CM |
2773 | |
2774 | ClearPageError(page); | |
2775 | ||
7f3c74fb | 2776 | pg_offset = i_size & (PAGE_CACHE_SIZE - 1); |
211c17f5 | 2777 | if (page->index > end_index || |
7f3c74fb | 2778 | (page->index == end_index && !pg_offset)) { |
39be25cd | 2779 | page->mapping->a_ops->invalidatepage(page, 0); |
d1310b2e CM |
2780 | unlock_page(page); |
2781 | return 0; | |
2782 | } | |
2783 | ||
2784 | if (page->index == end_index) { | |
2785 | char *userpage; | |
2786 | ||
d1310b2e | 2787 | userpage = kmap_atomic(page, KM_USER0); |
7f3c74fb CM |
2788 | memset(userpage + pg_offset, 0, |
2789 | PAGE_CACHE_SIZE - pg_offset); | |
d1310b2e | 2790 | kunmap_atomic(userpage, KM_USER0); |
211c17f5 | 2791 | flush_dcache_page(page); |
d1310b2e | 2792 | } |
7f3c74fb | 2793 | pg_offset = 0; |
d1310b2e CM |
2794 | |
2795 | set_page_extent_mapped(page); | |
2796 | ||
9e487107 JB |
2797 | if (!tree->ops || !tree->ops->fill_delalloc) |
2798 | fill_delalloc = false; | |
2799 | ||
d1310b2e CM |
2800 | delalloc_start = start; |
2801 | delalloc_end = 0; | |
c8b97818 | 2802 | page_started = 0; |
9e487107 | 2803 | if (!epd->extent_locked && fill_delalloc) { |
f85d7d6c | 2804 | u64 delalloc_to_write = 0; |
11c8349b CM |
2805 | /* |
2806 | * make sure the wbc mapping index is at least updated | |
2807 | * to this page. | |
2808 | */ | |
2809 | update_nr_written(page, wbc, 0); | |
2810 | ||
d397712b | 2811 | while (delalloc_end < page_end) { |
771ed689 | 2812 | nr_delalloc = find_lock_delalloc_range(inode, tree, |
c8b97818 CM |
2813 | page, |
2814 | &delalloc_start, | |
d1310b2e CM |
2815 | &delalloc_end, |
2816 | 128 * 1024 * 1024); | |
771ed689 CM |
2817 | if (nr_delalloc == 0) { |
2818 | delalloc_start = delalloc_end + 1; | |
2819 | continue; | |
2820 | } | |
013bd4c3 TI |
2821 | ret = tree->ops->fill_delalloc(inode, page, |
2822 | delalloc_start, | |
2823 | delalloc_end, | |
2824 | &page_started, | |
2825 | &nr_written); | |
2826 | BUG_ON(ret); | |
f85d7d6c CM |
2827 | /* |
2828 | * delalloc_end is already one less than the total | |
2829 | * length, so we don't subtract one from | |
2830 | * PAGE_CACHE_SIZE | |
2831 | */ | |
2832 | delalloc_to_write += (delalloc_end - delalloc_start + | |
2833 | PAGE_CACHE_SIZE) >> | |
2834 | PAGE_CACHE_SHIFT; | |
d1310b2e | 2835 | delalloc_start = delalloc_end + 1; |
d1310b2e | 2836 | } |
f85d7d6c CM |
2837 | if (wbc->nr_to_write < delalloc_to_write) { |
2838 | int thresh = 8192; | |
2839 | ||
2840 | if (delalloc_to_write < thresh * 2) | |
2841 | thresh = delalloc_to_write; | |
2842 | wbc->nr_to_write = min_t(u64, delalloc_to_write, | |
2843 | thresh); | |
2844 | } | |
c8b97818 | 2845 | |
771ed689 CM |
2846 | /* did the fill delalloc function already unlock and start |
2847 | * the IO? | |
2848 | */ | |
2849 | if (page_started) { | |
2850 | ret = 0; | |
11c8349b CM |
2851 | /* |
2852 | * we've unlocked the page, so we can't update | |
2853 | * the mapping's writeback index, just update | |
2854 | * nr_to_write. | |
2855 | */ | |
2856 | wbc->nr_to_write -= nr_written; | |
2857 | goto done_unlocked; | |
771ed689 | 2858 | } |
c8b97818 | 2859 | } |
247e743c | 2860 | if (tree->ops && tree->ops->writepage_start_hook) { |
c8b97818 CM |
2861 | ret = tree->ops->writepage_start_hook(page, start, |
2862 | page_end); | |
87826df0 JM |
2863 | if (ret) { |
2864 | /* Fixup worker will requeue */ | |
2865 | if (ret == -EBUSY) | |
2866 | wbc->pages_skipped++; | |
2867 | else | |
2868 | redirty_page_for_writepage(wbc, page); | |
11c8349b | 2869 | update_nr_written(page, wbc, nr_written); |
247e743c | 2870 | unlock_page(page); |
771ed689 | 2871 | ret = 0; |
11c8349b | 2872 | goto done_unlocked; |
247e743c CM |
2873 | } |
2874 | } | |
2875 | ||
11c8349b CM |
2876 | /* |
2877 | * we don't want to touch the inode after unlocking the page, | |
2878 | * so we update the mapping writeback index now | |
2879 | */ | |
2880 | update_nr_written(page, wbc, nr_written + 1); | |
771ed689 | 2881 | |
d1310b2e | 2882 | end = page_end; |
d1310b2e | 2883 | if (last_byte <= start) { |
e6dcd2dc CM |
2884 | if (tree->ops && tree->ops->writepage_end_io_hook) |
2885 | tree->ops->writepage_end_io_hook(page, start, | |
2886 | page_end, NULL, 1); | |
d1310b2e CM |
2887 | goto done; |
2888 | } | |
2889 | ||
d1310b2e CM |
2890 | blocksize = inode->i_sb->s_blocksize; |
2891 | ||
2892 | while (cur <= end) { | |
2893 | if (cur >= last_byte) { | |
e6dcd2dc CM |
2894 | if (tree->ops && tree->ops->writepage_end_io_hook) |
2895 | tree->ops->writepage_end_io_hook(page, cur, | |
2896 | page_end, NULL, 1); | |
d1310b2e CM |
2897 | break; |
2898 | } | |
7f3c74fb | 2899 | em = epd->get_extent(inode, page, pg_offset, cur, |
d1310b2e | 2900 | end - cur + 1, 1); |
c704005d | 2901 | if (IS_ERR_OR_NULL(em)) { |
d1310b2e CM |
2902 | SetPageError(page); |
2903 | break; | |
2904 | } | |
2905 | ||
2906 | extent_offset = cur - em->start; | |
2907 | BUG_ON(extent_map_end(em) <= cur); | |
2908 | BUG_ON(end < cur); | |
2909 | iosize = min(extent_map_end(em) - cur, end - cur + 1); | |
2910 | iosize = (iosize + blocksize - 1) & ~((u64)blocksize - 1); | |
2911 | sector = (em->block_start + extent_offset) >> 9; | |
2912 | bdev = em->bdev; | |
2913 | block_start = em->block_start; | |
c8b97818 | 2914 | compressed = test_bit(EXTENT_FLAG_COMPRESSED, &em->flags); |
d1310b2e CM |
2915 | free_extent_map(em); |
2916 | em = NULL; | |
2917 | ||
c8b97818 CM |
2918 | /* |
2919 | * compressed and inline extents are written through other | |
2920 | * paths in the FS | |
2921 | */ | |
2922 | if (compressed || block_start == EXTENT_MAP_HOLE || | |
d1310b2e | 2923 | block_start == EXTENT_MAP_INLINE) { |
c8b97818 CM |
2924 | /* |
2925 | * end_io notification does not happen here for | |
2926 | * compressed extents | |
2927 | */ | |
2928 | if (!compressed && tree->ops && | |
2929 | tree->ops->writepage_end_io_hook) | |
e6dcd2dc CM |
2930 | tree->ops->writepage_end_io_hook(page, cur, |
2931 | cur + iosize - 1, | |
2932 | NULL, 1); | |
c8b97818 CM |
2933 | else if (compressed) { |
2934 | /* we don't want to end_page_writeback on | |
2935 | * a compressed extent. this happens | |
2936 | * elsewhere | |
2937 | */ | |
2938 | nr++; | |
2939 | } | |
2940 | ||
2941 | cur += iosize; | |
7f3c74fb | 2942 | pg_offset += iosize; |
d1310b2e CM |
2943 | continue; |
2944 | } | |
d1310b2e CM |
2945 | /* leave this out until we have a page_mkwrite call */ |
2946 | if (0 && !test_range_bit(tree, cur, cur + iosize - 1, | |
9655d298 | 2947 | EXTENT_DIRTY, 0, NULL)) { |
d1310b2e | 2948 | cur = cur + iosize; |
7f3c74fb | 2949 | pg_offset += iosize; |
d1310b2e CM |
2950 | continue; |
2951 | } | |
c8b97818 | 2952 | |
d1310b2e CM |
2953 | if (tree->ops && tree->ops->writepage_io_hook) { |
2954 | ret = tree->ops->writepage_io_hook(page, cur, | |
2955 | cur + iosize - 1); | |
2956 | } else { | |
2957 | ret = 0; | |
2958 | } | |
1259ab75 | 2959 | if (ret) { |
d1310b2e | 2960 | SetPageError(page); |
1259ab75 | 2961 | } else { |
d1310b2e | 2962 | unsigned long max_nr = end_index + 1; |
7f3c74fb | 2963 | |
d1310b2e CM |
2964 | set_range_writeback(tree, cur, cur + iosize - 1); |
2965 | if (!PageWriteback(page)) { | |
d397712b CM |
2966 | printk(KERN_ERR "btrfs warning page %lu not " |
2967 | "writeback, cur %llu end %llu\n", | |
2968 | page->index, (unsigned long long)cur, | |
d1310b2e CM |
2969 | (unsigned long long)end); |
2970 | } | |
2971 | ||
ffbd517d CM |
2972 | ret = submit_extent_page(write_flags, tree, page, |
2973 | sector, iosize, pg_offset, | |
2974 | bdev, &epd->bio, max_nr, | |
c8b97818 CM |
2975 | end_bio_extent_writepage, |
2976 | 0, 0, 0); | |
d1310b2e CM |
2977 | if (ret) |
2978 | SetPageError(page); | |
2979 | } | |
2980 | cur = cur + iosize; | |
7f3c74fb | 2981 | pg_offset += iosize; |
d1310b2e CM |
2982 | nr++; |
2983 | } | |
2984 | done: | |
2985 | if (nr == 0) { | |
2986 | /* make sure the mapping tag for page dirty gets cleared */ | |
2987 | set_page_writeback(page); | |
2988 | end_page_writeback(page); | |
2989 | } | |
d1310b2e | 2990 | unlock_page(page); |
771ed689 | 2991 | |
11c8349b CM |
2992 | done_unlocked: |
2993 | ||
2c64c53d CM |
2994 | /* drop our reference on any cached states */ |
2995 | free_extent_state(cached_state); | |
d1310b2e CM |
2996 | return 0; |
2997 | } | |
2998 | ||
0b32f4bb JB |
2999 | static int eb_wait(void *word) |
3000 | { | |
3001 | io_schedule(); | |
3002 | return 0; | |
3003 | } | |
3004 | ||
3005 | static void wait_on_extent_buffer_writeback(struct extent_buffer *eb) | |
3006 | { | |
3007 | wait_on_bit(&eb->bflags, EXTENT_BUFFER_WRITEBACK, eb_wait, | |
3008 | TASK_UNINTERRUPTIBLE); | |
3009 | } | |
3010 | ||
3011 | static int lock_extent_buffer_for_io(struct extent_buffer *eb, | |
3012 | struct btrfs_fs_info *fs_info, | |
3013 | struct extent_page_data *epd) | |
3014 | { | |
3015 | unsigned long i, num_pages; | |
3016 | int flush = 0; | |
3017 | int ret = 0; | |
3018 | ||
3019 | if (!btrfs_try_tree_write_lock(eb)) { | |
3020 | flush = 1; | |
3021 | flush_write_bio(epd); | |
3022 | btrfs_tree_lock(eb); | |
3023 | } | |
3024 | ||
3025 | if (test_bit(EXTENT_BUFFER_WRITEBACK, &eb->bflags)) { | |
3026 | btrfs_tree_unlock(eb); | |
3027 | if (!epd->sync_io) | |
3028 | return 0; | |
3029 | if (!flush) { | |
3030 | flush_write_bio(epd); | |
3031 | flush = 1; | |
3032 | } | |
a098d8e8 CM |
3033 | while (1) { |
3034 | wait_on_extent_buffer_writeback(eb); | |
3035 | btrfs_tree_lock(eb); | |
3036 | if (!test_bit(EXTENT_BUFFER_WRITEBACK, &eb->bflags)) | |
3037 | break; | |
0b32f4bb | 3038 | btrfs_tree_unlock(eb); |
0b32f4bb JB |
3039 | } |
3040 | } | |
3041 | ||
3042 | if (test_and_clear_bit(EXTENT_BUFFER_DIRTY, &eb->bflags)) { | |
3043 | set_bit(EXTENT_BUFFER_WRITEBACK, &eb->bflags); | |
3044 | btrfs_set_header_flag(eb, BTRFS_HEADER_FLAG_WRITTEN); | |
3045 | spin_lock(&fs_info->delalloc_lock); | |
3046 | if (fs_info->dirty_metadata_bytes >= eb->len) | |
3047 | fs_info->dirty_metadata_bytes -= eb->len; | |
3048 | else | |
3049 | WARN_ON(1); | |
3050 | spin_unlock(&fs_info->delalloc_lock); | |
3051 | ret = 1; | |
3052 | } | |
3053 | ||
3054 | btrfs_tree_unlock(eb); | |
3055 | ||
3056 | if (!ret) | |
3057 | return ret; | |
3058 | ||
3059 | num_pages = num_extent_pages(eb->start, eb->len); | |
3060 | for (i = 0; i < num_pages; i++) { | |
3061 | struct page *p = extent_buffer_page(eb, i); | |
3062 | ||
3063 | if (!trylock_page(p)) { | |
3064 | if (!flush) { | |
3065 | flush_write_bio(epd); | |
3066 | flush = 1; | |
3067 | } | |
3068 | lock_page(p); | |
3069 | } | |
3070 | } | |
3071 | ||
3072 | return ret; | |
3073 | } | |
3074 | ||
3075 | static void end_extent_buffer_writeback(struct extent_buffer *eb) | |
3076 | { | |
3077 | clear_bit(EXTENT_BUFFER_WRITEBACK, &eb->bflags); | |
3078 | smp_mb__after_clear_bit(); | |
3079 | wake_up_bit(&eb->bflags, EXTENT_BUFFER_WRITEBACK); | |
3080 | } | |
3081 | ||
3082 | static void end_bio_extent_buffer_writepage(struct bio *bio, int err) | |
3083 | { | |
3084 | int uptodate = err == 0; | |
3085 | struct bio_vec *bvec = bio->bi_io_vec + bio->bi_vcnt - 1; | |
3086 | struct extent_buffer *eb; | |
3087 | int done; | |
3088 | ||
3089 | do { | |
3090 | struct page *page = bvec->bv_page; | |
3091 | ||
3092 | bvec--; | |
3093 | eb = (struct extent_buffer *)page->private; | |
3094 | BUG_ON(!eb); | |
3095 | done = atomic_dec_and_test(&eb->io_pages); | |
3096 | ||
3097 | if (!uptodate || test_bit(EXTENT_BUFFER_IOERR, &eb->bflags)) { | |
3098 | set_bit(EXTENT_BUFFER_IOERR, &eb->bflags); | |
3099 | ClearPageUptodate(page); | |
3100 | SetPageError(page); | |
3101 | } | |
3102 | ||
3103 | end_page_writeback(page); | |
3104 | ||
3105 | if (!done) | |
3106 | continue; | |
3107 | ||
3108 | end_extent_buffer_writeback(eb); | |
3109 | } while (bvec >= bio->bi_io_vec); | |
3110 | ||
3111 | bio_put(bio); | |
3112 | ||
3113 | } | |
3114 | ||
3115 | static int write_one_eb(struct extent_buffer *eb, | |
3116 | struct btrfs_fs_info *fs_info, | |
3117 | struct writeback_control *wbc, | |
3118 | struct extent_page_data *epd) | |
3119 | { | |
3120 | struct block_device *bdev = fs_info->fs_devices->latest_bdev; | |
3121 | u64 offset = eb->start; | |
3122 | unsigned long i, num_pages; | |
3123 | int rw = (epd->sync_io ? WRITE_SYNC : WRITE); | |
3124 | int ret; | |
3125 | ||
3126 | clear_bit(EXTENT_BUFFER_IOERR, &eb->bflags); | |
3127 | num_pages = num_extent_pages(eb->start, eb->len); | |
3128 | atomic_set(&eb->io_pages, num_pages); | |
3129 | for (i = 0; i < num_pages; i++) { | |
3130 | struct page *p = extent_buffer_page(eb, i); | |
3131 | ||
3132 | clear_page_dirty_for_io(p); | |
3133 | set_page_writeback(p); | |
3134 | ret = submit_extent_page(rw, eb->tree, p, offset >> 9, | |
3135 | PAGE_CACHE_SIZE, 0, bdev, &epd->bio, | |
3136 | -1, end_bio_extent_buffer_writepage, | |
3137 | 0, 0, 0); | |
3138 | if (ret) { | |
3139 | set_bit(EXTENT_BUFFER_IOERR, &eb->bflags); | |
3140 | SetPageError(p); | |
3141 | if (atomic_sub_and_test(num_pages - i, &eb->io_pages)) | |
3142 | end_extent_buffer_writeback(eb); | |
3143 | ret = -EIO; | |
3144 | break; | |
3145 | } | |
3146 | offset += PAGE_CACHE_SIZE; | |
3147 | update_nr_written(p, wbc, 1); | |
3148 | unlock_page(p); | |
3149 | } | |
3150 | ||
3151 | if (unlikely(ret)) { | |
3152 | for (; i < num_pages; i++) { | |
3153 | struct page *p = extent_buffer_page(eb, i); | |
3154 | unlock_page(p); | |
3155 | } | |
3156 | } | |
3157 | ||
3158 | return ret; | |
3159 | } | |
3160 | ||
3161 | int btree_write_cache_pages(struct address_space *mapping, | |
3162 | struct writeback_control *wbc) | |
3163 | { | |
3164 | struct extent_io_tree *tree = &BTRFS_I(mapping->host)->io_tree; | |
3165 | struct btrfs_fs_info *fs_info = BTRFS_I(mapping->host)->root->fs_info; | |
3166 | struct extent_buffer *eb, *prev_eb = NULL; | |
3167 | struct extent_page_data epd = { | |
3168 | .bio = NULL, | |
3169 | .tree = tree, | |
3170 | .extent_locked = 0, | |
3171 | .sync_io = wbc->sync_mode == WB_SYNC_ALL, | |
3172 | }; | |
3173 | int ret = 0; | |
3174 | int done = 0; | |
3175 | int nr_to_write_done = 0; | |
3176 | struct pagevec pvec; | |
3177 | int nr_pages; | |
3178 | pgoff_t index; | |
3179 | pgoff_t end; /* Inclusive */ | |
3180 | int scanned = 0; | |
3181 | int tag; | |
3182 | ||
3183 | pagevec_init(&pvec, 0); | |
3184 | if (wbc->range_cyclic) { | |
3185 | index = mapping->writeback_index; /* Start from prev offset */ | |
3186 | end = -1; | |
3187 | } else { | |
3188 | index = wbc->range_start >> PAGE_CACHE_SHIFT; | |
3189 | end = wbc->range_end >> PAGE_CACHE_SHIFT; | |
3190 | scanned = 1; | |
3191 | } | |
3192 | if (wbc->sync_mode == WB_SYNC_ALL) | |
3193 | tag = PAGECACHE_TAG_TOWRITE; | |
3194 | else | |
3195 | tag = PAGECACHE_TAG_DIRTY; | |
3196 | retry: | |
3197 | if (wbc->sync_mode == WB_SYNC_ALL) | |
3198 | tag_pages_for_writeback(mapping, index, end); | |
3199 | while (!done && !nr_to_write_done && (index <= end) && | |
3200 | (nr_pages = pagevec_lookup_tag(&pvec, mapping, &index, tag, | |
3201 | min(end - index, (pgoff_t)PAGEVEC_SIZE-1) + 1))) { | |
3202 | unsigned i; | |
3203 | ||
3204 | scanned = 1; | |
3205 | for (i = 0; i < nr_pages; i++) { | |
3206 | struct page *page = pvec.pages[i]; | |
3207 | ||
3208 | if (!PagePrivate(page)) | |
3209 | continue; | |
3210 | ||
3211 | if (!wbc->range_cyclic && page->index > end) { | |
3212 | done = 1; | |
3213 | break; | |
3214 | } | |
3215 | ||
3216 | eb = (struct extent_buffer *)page->private; | |
3217 | if (!eb) { | |
3218 | WARN_ON(1); | |
3219 | continue; | |
3220 | } | |
3221 | ||
3222 | if (eb == prev_eb) | |
3223 | continue; | |
3224 | ||
3225 | if (!atomic_inc_not_zero(&eb->refs)) { | |
3226 | WARN_ON(1); | |
3227 | continue; | |
3228 | } | |
3229 | ||
3230 | prev_eb = eb; | |
3231 | ret = lock_extent_buffer_for_io(eb, fs_info, &epd); | |
3232 | if (!ret) { | |
3233 | free_extent_buffer(eb); | |
3234 | continue; | |
3235 | } | |
3236 | ||
3237 | ret = write_one_eb(eb, fs_info, wbc, &epd); | |
3238 | if (ret) { | |
3239 | done = 1; | |
3240 | free_extent_buffer(eb); | |
3241 | break; | |
3242 | } | |
3243 | free_extent_buffer(eb); | |
3244 | ||
3245 | /* | |
3246 | * the filesystem may choose to bump up nr_to_write. | |
3247 | * We have to make sure to honor the new nr_to_write | |
3248 | * at any time | |
3249 | */ | |
3250 | nr_to_write_done = wbc->nr_to_write <= 0; | |
3251 | } | |
3252 | pagevec_release(&pvec); | |
3253 | cond_resched(); | |
3254 | } | |
3255 | if (!scanned && !done) { | |
3256 | /* | |
3257 | * We hit the last page and there is more work to be done: wrap | |
3258 | * back to the start of the file | |
3259 | */ | |
3260 | scanned = 1; | |
3261 | index = 0; | |
3262 | goto retry; | |
3263 | } | |
3264 | flush_write_bio(&epd); | |
3265 | return ret; | |
3266 | } | |
3267 | ||
d1310b2e | 3268 | /** |
4bef0848 | 3269 | * write_cache_pages - walk the list of dirty pages of the given address space and write all of them. |
d1310b2e CM |
3270 | * @mapping: address space structure to write |
3271 | * @wbc: subtract the number of written pages from *@wbc->nr_to_write | |
3272 | * @writepage: function called for each page | |
3273 | * @data: data passed to writepage function | |
3274 | * | |
3275 | * If a page is already under I/O, write_cache_pages() skips it, even | |
3276 | * if it's dirty. This is desirable behaviour for memory-cleaning writeback, | |
3277 | * but it is INCORRECT for data-integrity system calls such as fsync(). fsync() | |
3278 | * and msync() need to guarantee that all the data which was dirty at the time | |
3279 | * the call was made get new I/O started against them. If wbc->sync_mode is | |
3280 | * WB_SYNC_ALL then we were called for data integrity and we must wait for | |
3281 | * existing IO to complete. | |
3282 | */ | |
b2950863 | 3283 | static int extent_write_cache_pages(struct extent_io_tree *tree, |
4bef0848 CM |
3284 | struct address_space *mapping, |
3285 | struct writeback_control *wbc, | |
d2c3f4f6 CM |
3286 | writepage_t writepage, void *data, |
3287 | void (*flush_fn)(void *)) | |
d1310b2e | 3288 | { |
d1310b2e CM |
3289 | int ret = 0; |
3290 | int done = 0; | |
f85d7d6c | 3291 | int nr_to_write_done = 0; |
d1310b2e CM |
3292 | struct pagevec pvec; |
3293 | int nr_pages; | |
3294 | pgoff_t index; | |
3295 | pgoff_t end; /* Inclusive */ | |
3296 | int scanned = 0; | |
f7aaa06b | 3297 | int tag; |
d1310b2e | 3298 | |
d1310b2e CM |
3299 | pagevec_init(&pvec, 0); |
3300 | if (wbc->range_cyclic) { | |
3301 | index = mapping->writeback_index; /* Start from prev offset */ | |
3302 | end = -1; | |
3303 | } else { | |
3304 | index = wbc->range_start >> PAGE_CACHE_SHIFT; | |
3305 | end = wbc->range_end >> PAGE_CACHE_SHIFT; | |
d1310b2e CM |
3306 | scanned = 1; |
3307 | } | |
f7aaa06b JB |
3308 | if (wbc->sync_mode == WB_SYNC_ALL) |
3309 | tag = PAGECACHE_TAG_TOWRITE; | |
3310 | else | |
3311 | tag = PAGECACHE_TAG_DIRTY; | |
d1310b2e | 3312 | retry: |
f7aaa06b JB |
3313 | if (wbc->sync_mode == WB_SYNC_ALL) |
3314 | tag_pages_for_writeback(mapping, index, end); | |
f85d7d6c | 3315 | while (!done && !nr_to_write_done && (index <= end) && |
f7aaa06b JB |
3316 | (nr_pages = pagevec_lookup_tag(&pvec, mapping, &index, tag, |
3317 | min(end - index, (pgoff_t)PAGEVEC_SIZE-1) + 1))) { | |
d1310b2e CM |
3318 | unsigned i; |
3319 | ||
3320 | scanned = 1; | |
3321 | for (i = 0; i < nr_pages; i++) { | |
3322 | struct page *page = pvec.pages[i]; | |
3323 | ||
3324 | /* | |
3325 | * At this point we hold neither mapping->tree_lock nor | |
3326 | * lock on the page itself: the page may be truncated or | |
3327 | * invalidated (changing page->mapping to NULL), or even | |
3328 | * swizzled back from swapper_space to tmpfs file | |
3329 | * mapping | |
3330 | */ | |
01d658f2 CM |
3331 | if (tree->ops && |
3332 | tree->ops->write_cache_pages_lock_hook) { | |
3333 | tree->ops->write_cache_pages_lock_hook(page, | |
3334 | data, flush_fn); | |
3335 | } else { | |
3336 | if (!trylock_page(page)) { | |
3337 | flush_fn(data); | |
3338 | lock_page(page); | |
3339 | } | |
3340 | } | |
d1310b2e CM |
3341 | |
3342 | if (unlikely(page->mapping != mapping)) { | |
3343 | unlock_page(page); | |
3344 | continue; | |
3345 | } | |
3346 | ||
3347 | if (!wbc->range_cyclic && page->index > end) { | |
3348 | done = 1; | |
3349 | unlock_page(page); | |
3350 | continue; | |
3351 | } | |
3352 | ||
d2c3f4f6 | 3353 | if (wbc->sync_mode != WB_SYNC_NONE) { |
0e6bd956 CM |
3354 | if (PageWriteback(page)) |
3355 | flush_fn(data); | |
d1310b2e | 3356 | wait_on_page_writeback(page); |
d2c3f4f6 | 3357 | } |
d1310b2e CM |
3358 | |
3359 | if (PageWriteback(page) || | |
3360 | !clear_page_dirty_for_io(page)) { | |
3361 | unlock_page(page); | |
3362 | continue; | |
3363 | } | |
3364 | ||
3365 | ret = (*writepage)(page, wbc, data); | |
3366 | ||
3367 | if (unlikely(ret == AOP_WRITEPAGE_ACTIVATE)) { | |
3368 | unlock_page(page); | |
3369 | ret = 0; | |
3370 | } | |
f85d7d6c | 3371 | if (ret) |
d1310b2e | 3372 | done = 1; |
f85d7d6c CM |
3373 | |
3374 | /* | |
3375 | * the filesystem may choose to bump up nr_to_write. | |
3376 | * We have to make sure to honor the new nr_to_write | |
3377 | * at any time | |
3378 | */ | |
3379 | nr_to_write_done = wbc->nr_to_write <= 0; | |
d1310b2e CM |
3380 | } |
3381 | pagevec_release(&pvec); | |
3382 | cond_resched(); | |
3383 | } | |
3384 | if (!scanned && !done) { | |
3385 | /* | |
3386 | * We hit the last page and there is more work to be done: wrap | |
3387 | * back to the start of the file | |
3388 | */ | |
3389 | scanned = 1; | |
3390 | index = 0; | |
3391 | goto retry; | |
3392 | } | |
d1310b2e CM |
3393 | return ret; |
3394 | } | |
d1310b2e | 3395 | |
ffbd517d | 3396 | static void flush_epd_write_bio(struct extent_page_data *epd) |
d2c3f4f6 | 3397 | { |
d2c3f4f6 | 3398 | if (epd->bio) { |
ffbd517d CM |
3399 | if (epd->sync_io) |
3400 | submit_one_bio(WRITE_SYNC, epd->bio, 0, 0); | |
3401 | else | |
3402 | submit_one_bio(WRITE, epd->bio, 0, 0); | |
d2c3f4f6 CM |
3403 | epd->bio = NULL; |
3404 | } | |
3405 | } | |
3406 | ||
ffbd517d CM |
3407 | static noinline void flush_write_bio(void *data) |
3408 | { | |
3409 | struct extent_page_data *epd = data; | |
3410 | flush_epd_write_bio(epd); | |
3411 | } | |
3412 | ||
d1310b2e CM |
3413 | int extent_write_full_page(struct extent_io_tree *tree, struct page *page, |
3414 | get_extent_t *get_extent, | |
3415 | struct writeback_control *wbc) | |
3416 | { | |
3417 | int ret; | |
d1310b2e CM |
3418 | struct extent_page_data epd = { |
3419 | .bio = NULL, | |
3420 | .tree = tree, | |
3421 | .get_extent = get_extent, | |
771ed689 | 3422 | .extent_locked = 0, |
ffbd517d | 3423 | .sync_io = wbc->sync_mode == WB_SYNC_ALL, |
d1310b2e | 3424 | }; |
d1310b2e | 3425 | |
d1310b2e CM |
3426 | ret = __extent_writepage(page, wbc, &epd); |
3427 | ||
ffbd517d | 3428 | flush_epd_write_bio(&epd); |
d1310b2e CM |
3429 | return ret; |
3430 | } | |
d1310b2e | 3431 | |
771ed689 CM |
3432 | int extent_write_locked_range(struct extent_io_tree *tree, struct inode *inode, |
3433 | u64 start, u64 end, get_extent_t *get_extent, | |
3434 | int mode) | |
3435 | { | |
3436 | int ret = 0; | |
3437 | struct address_space *mapping = inode->i_mapping; | |
3438 | struct page *page; | |
3439 | unsigned long nr_pages = (end - start + PAGE_CACHE_SIZE) >> | |
3440 | PAGE_CACHE_SHIFT; | |
3441 | ||
3442 | struct extent_page_data epd = { | |
3443 | .bio = NULL, | |
3444 | .tree = tree, | |
3445 | .get_extent = get_extent, | |
3446 | .extent_locked = 1, | |
ffbd517d | 3447 | .sync_io = mode == WB_SYNC_ALL, |
771ed689 CM |
3448 | }; |
3449 | struct writeback_control wbc_writepages = { | |
771ed689 | 3450 | .sync_mode = mode, |
771ed689 CM |
3451 | .nr_to_write = nr_pages * 2, |
3452 | .range_start = start, | |
3453 | .range_end = end + 1, | |
3454 | }; | |
3455 | ||
d397712b | 3456 | while (start <= end) { |
771ed689 CM |
3457 | page = find_get_page(mapping, start >> PAGE_CACHE_SHIFT); |
3458 | if (clear_page_dirty_for_io(page)) | |
3459 | ret = __extent_writepage(page, &wbc_writepages, &epd); | |
3460 | else { | |
3461 | if (tree->ops && tree->ops->writepage_end_io_hook) | |
3462 | tree->ops->writepage_end_io_hook(page, start, | |
3463 | start + PAGE_CACHE_SIZE - 1, | |
3464 | NULL, 1); | |
3465 | unlock_page(page); | |
3466 | } | |
3467 | page_cache_release(page); | |
3468 | start += PAGE_CACHE_SIZE; | |
3469 | } | |
3470 | ||
ffbd517d | 3471 | flush_epd_write_bio(&epd); |
771ed689 CM |
3472 | return ret; |
3473 | } | |
d1310b2e CM |
3474 | |
3475 | int extent_writepages(struct extent_io_tree *tree, | |
3476 | struct address_space *mapping, | |
3477 | get_extent_t *get_extent, | |
3478 | struct writeback_control *wbc) | |
3479 | { | |
3480 | int ret = 0; | |
3481 | struct extent_page_data epd = { | |
3482 | .bio = NULL, | |
3483 | .tree = tree, | |
3484 | .get_extent = get_extent, | |
771ed689 | 3485 | .extent_locked = 0, |
ffbd517d | 3486 | .sync_io = wbc->sync_mode == WB_SYNC_ALL, |
d1310b2e CM |
3487 | }; |
3488 | ||
4bef0848 | 3489 | ret = extent_write_cache_pages(tree, mapping, wbc, |
d2c3f4f6 CM |
3490 | __extent_writepage, &epd, |
3491 | flush_write_bio); | |
ffbd517d | 3492 | flush_epd_write_bio(&epd); |
d1310b2e CM |
3493 | return ret; |
3494 | } | |
d1310b2e CM |
3495 | |
3496 | int extent_readpages(struct extent_io_tree *tree, | |
3497 | struct address_space *mapping, | |
3498 | struct list_head *pages, unsigned nr_pages, | |
3499 | get_extent_t get_extent) | |
3500 | { | |
3501 | struct bio *bio = NULL; | |
3502 | unsigned page_idx; | |
c8b97818 | 3503 | unsigned long bio_flags = 0; |
d1310b2e | 3504 | |
d1310b2e CM |
3505 | for (page_idx = 0; page_idx < nr_pages; page_idx++) { |
3506 | struct page *page = list_entry(pages->prev, struct page, lru); | |
3507 | ||
3508 | prefetchw(&page->flags); | |
3509 | list_del(&page->lru); | |
28ecb609 | 3510 | if (!add_to_page_cache_lru(page, mapping, |
43e817a1 | 3511 | page->index, GFP_NOFS)) { |
f188591e | 3512 | __extent_read_full_page(tree, page, get_extent, |
c8b97818 | 3513 | &bio, 0, &bio_flags); |
d1310b2e CM |
3514 | } |
3515 | page_cache_release(page); | |
3516 | } | |
d1310b2e CM |
3517 | BUG_ON(!list_empty(pages)); |
3518 | if (bio) | |
c8b97818 | 3519 | submit_one_bio(READ, bio, 0, bio_flags); |
d1310b2e CM |
3520 | return 0; |
3521 | } | |
d1310b2e CM |
3522 | |
3523 | /* | |
3524 | * basic invalidatepage code, this waits on any locked or writeback | |
3525 | * ranges corresponding to the page, and then deletes any extent state | |
3526 | * records from the tree | |
3527 | */ | |
3528 | int extent_invalidatepage(struct extent_io_tree *tree, | |
3529 | struct page *page, unsigned long offset) | |
3530 | { | |
2ac55d41 | 3531 | struct extent_state *cached_state = NULL; |
d1310b2e CM |
3532 | u64 start = ((u64)page->index << PAGE_CACHE_SHIFT); |
3533 | u64 end = start + PAGE_CACHE_SIZE - 1; | |
3534 | size_t blocksize = page->mapping->host->i_sb->s_blocksize; | |
3535 | ||
d397712b | 3536 | start += (offset + blocksize - 1) & ~(blocksize - 1); |
d1310b2e CM |
3537 | if (start > end) |
3538 | return 0; | |
3539 | ||
2ac55d41 | 3540 | lock_extent_bits(tree, start, end, 0, &cached_state, GFP_NOFS); |
1edbb734 | 3541 | wait_on_page_writeback(page); |
d1310b2e | 3542 | clear_extent_bit(tree, start, end, |
32c00aff JB |
3543 | EXTENT_LOCKED | EXTENT_DIRTY | EXTENT_DELALLOC | |
3544 | EXTENT_DO_ACCOUNTING, | |
2ac55d41 | 3545 | 1, 1, &cached_state, GFP_NOFS); |
d1310b2e CM |
3546 | return 0; |
3547 | } | |
d1310b2e | 3548 | |
7b13b7b1 CM |
3549 | /* |
3550 | * a helper for releasepage, this tests for areas of the page that | |
3551 | * are locked or under IO and drops the related state bits if it is safe | |
3552 | * to drop the page. | |
3553 | */ | |
3554 | int try_release_extent_state(struct extent_map_tree *map, | |
3555 | struct extent_io_tree *tree, struct page *page, | |
3556 | gfp_t mask) | |
3557 | { | |
3558 | u64 start = (u64)page->index << PAGE_CACHE_SHIFT; | |
3559 | u64 end = start + PAGE_CACHE_SIZE - 1; | |
3560 | int ret = 1; | |
3561 | ||
211f90e6 | 3562 | if (test_range_bit(tree, start, end, |
8b62b72b | 3563 | EXTENT_IOBITS, 0, NULL)) |
7b13b7b1 CM |
3564 | ret = 0; |
3565 | else { | |
3566 | if ((mask & GFP_NOFS) == GFP_NOFS) | |
3567 | mask = GFP_NOFS; | |
11ef160f CM |
3568 | /* |
3569 | * at this point we can safely clear everything except the | |
3570 | * locked bit and the nodatasum bit | |
3571 | */ | |
e3f24cc5 | 3572 | ret = clear_extent_bit(tree, start, end, |
11ef160f CM |
3573 | ~(EXTENT_LOCKED | EXTENT_NODATASUM), |
3574 | 0, 0, NULL, mask); | |
e3f24cc5 CM |
3575 | |
3576 | /* if clear_extent_bit failed for enomem reasons, | |
3577 | * we can't allow the release to continue. | |
3578 | */ | |
3579 | if (ret < 0) | |
3580 | ret = 0; | |
3581 | else | |
3582 | ret = 1; | |
7b13b7b1 CM |
3583 | } |
3584 | return ret; | |
3585 | } | |
7b13b7b1 | 3586 | |
d1310b2e CM |
3587 | /* |
3588 | * a helper for releasepage. As long as there are no locked extents | |
3589 | * in the range corresponding to the page, both state records and extent | |
3590 | * map records are removed | |
3591 | */ | |
3592 | int try_release_extent_mapping(struct extent_map_tree *map, | |
70dec807 CM |
3593 | struct extent_io_tree *tree, struct page *page, |
3594 | gfp_t mask) | |
d1310b2e CM |
3595 | { |
3596 | struct extent_map *em; | |
3597 | u64 start = (u64)page->index << PAGE_CACHE_SHIFT; | |
3598 | u64 end = start + PAGE_CACHE_SIZE - 1; | |
7b13b7b1 | 3599 | |
70dec807 CM |
3600 | if ((mask & __GFP_WAIT) && |
3601 | page->mapping->host->i_size > 16 * 1024 * 1024) { | |
39b5637f | 3602 | u64 len; |
70dec807 | 3603 | while (start <= end) { |
39b5637f | 3604 | len = end - start + 1; |
890871be | 3605 | write_lock(&map->lock); |
39b5637f | 3606 | em = lookup_extent_mapping(map, start, len); |
285190d9 | 3607 | if (!em) { |
890871be | 3608 | write_unlock(&map->lock); |
70dec807 CM |
3609 | break; |
3610 | } | |
7f3c74fb CM |
3611 | if (test_bit(EXTENT_FLAG_PINNED, &em->flags) || |
3612 | em->start != start) { | |
890871be | 3613 | write_unlock(&map->lock); |
70dec807 CM |
3614 | free_extent_map(em); |
3615 | break; | |
3616 | } | |
3617 | if (!test_range_bit(tree, em->start, | |
3618 | extent_map_end(em) - 1, | |
8b62b72b | 3619 | EXTENT_LOCKED | EXTENT_WRITEBACK, |
9655d298 | 3620 | 0, NULL)) { |
70dec807 CM |
3621 | remove_extent_mapping(map, em); |
3622 | /* once for the rb tree */ | |
3623 | free_extent_map(em); | |
3624 | } | |
3625 | start = extent_map_end(em); | |
890871be | 3626 | write_unlock(&map->lock); |
70dec807 CM |
3627 | |
3628 | /* once for us */ | |
d1310b2e CM |
3629 | free_extent_map(em); |
3630 | } | |
d1310b2e | 3631 | } |
7b13b7b1 | 3632 | return try_release_extent_state(map, tree, page, mask); |
d1310b2e | 3633 | } |
d1310b2e | 3634 | |
ec29ed5b CM |
3635 | /* |
3636 | * helper function for fiemap, which doesn't want to see any holes. | |
3637 | * This maps until we find something past 'last' | |
3638 | */ | |
3639 | static struct extent_map *get_extent_skip_holes(struct inode *inode, | |
3640 | u64 offset, | |
3641 | u64 last, | |
3642 | get_extent_t *get_extent) | |
3643 | { | |
3644 | u64 sectorsize = BTRFS_I(inode)->root->sectorsize; | |
3645 | struct extent_map *em; | |
3646 | u64 len; | |
3647 | ||
3648 | if (offset >= last) | |
3649 | return NULL; | |
3650 | ||
3651 | while(1) { | |
3652 | len = last - offset; | |
3653 | if (len == 0) | |
3654 | break; | |
3655 | len = (len + sectorsize - 1) & ~(sectorsize - 1); | |
3656 | em = get_extent(inode, NULL, 0, offset, len, 0); | |
c704005d | 3657 | if (IS_ERR_OR_NULL(em)) |
ec29ed5b CM |
3658 | return em; |
3659 | ||
3660 | /* if this isn't a hole return it */ | |
3661 | if (!test_bit(EXTENT_FLAG_VACANCY, &em->flags) && | |
3662 | em->block_start != EXTENT_MAP_HOLE) { | |
3663 | return em; | |
3664 | } | |
3665 | ||
3666 | /* this is a hole, advance to the next extent */ | |
3667 | offset = extent_map_end(em); | |
3668 | free_extent_map(em); | |
3669 | if (offset >= last) | |
3670 | break; | |
3671 | } | |
3672 | return NULL; | |
3673 | } | |
3674 | ||
1506fcc8 YS |
3675 | int extent_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, |
3676 | __u64 start, __u64 len, get_extent_t *get_extent) | |
3677 | { | |
975f84fe | 3678 | int ret = 0; |
1506fcc8 YS |
3679 | u64 off = start; |
3680 | u64 max = start + len; | |
3681 | u32 flags = 0; | |
975f84fe JB |
3682 | u32 found_type; |
3683 | u64 last; | |
ec29ed5b | 3684 | u64 last_for_get_extent = 0; |
1506fcc8 | 3685 | u64 disko = 0; |
ec29ed5b | 3686 | u64 isize = i_size_read(inode); |
975f84fe | 3687 | struct btrfs_key found_key; |
1506fcc8 | 3688 | struct extent_map *em = NULL; |
2ac55d41 | 3689 | struct extent_state *cached_state = NULL; |
975f84fe JB |
3690 | struct btrfs_path *path; |
3691 | struct btrfs_file_extent_item *item; | |
1506fcc8 | 3692 | int end = 0; |
ec29ed5b CM |
3693 | u64 em_start = 0; |
3694 | u64 em_len = 0; | |
3695 | u64 em_end = 0; | |
1506fcc8 | 3696 | unsigned long emflags; |
1506fcc8 YS |
3697 | |
3698 | if (len == 0) | |
3699 | return -EINVAL; | |
3700 | ||
975f84fe JB |
3701 | path = btrfs_alloc_path(); |
3702 | if (!path) | |
3703 | return -ENOMEM; | |
3704 | path->leave_spinning = 1; | |
3705 | ||
4d479cf0 JB |
3706 | start = ALIGN(start, BTRFS_I(inode)->root->sectorsize); |
3707 | len = ALIGN(len, BTRFS_I(inode)->root->sectorsize); | |
3708 | ||
ec29ed5b CM |
3709 | /* |
3710 | * lookup the last file extent. We're not using i_size here | |
3711 | * because there might be preallocation past i_size | |
3712 | */ | |
975f84fe | 3713 | ret = btrfs_lookup_file_extent(NULL, BTRFS_I(inode)->root, |
33345d01 | 3714 | path, btrfs_ino(inode), -1, 0); |
975f84fe JB |
3715 | if (ret < 0) { |
3716 | btrfs_free_path(path); | |
3717 | return ret; | |
3718 | } | |
3719 | WARN_ON(!ret); | |
3720 | path->slots[0]--; | |
3721 | item = btrfs_item_ptr(path->nodes[0], path->slots[0], | |
3722 | struct btrfs_file_extent_item); | |
3723 | btrfs_item_key_to_cpu(path->nodes[0], &found_key, path->slots[0]); | |
3724 | found_type = btrfs_key_type(&found_key); | |
3725 | ||
ec29ed5b | 3726 | /* No extents, but there might be delalloc bits */ |
33345d01 | 3727 | if (found_key.objectid != btrfs_ino(inode) || |
975f84fe | 3728 | found_type != BTRFS_EXTENT_DATA_KEY) { |
ec29ed5b CM |
3729 | /* have to trust i_size as the end */ |
3730 | last = (u64)-1; | |
3731 | last_for_get_extent = isize; | |
3732 | } else { | |
3733 | /* | |
3734 | * remember the start of the last extent. There are a | |
3735 | * bunch of different factors that go into the length of the | |
3736 | * extent, so its much less complex to remember where it started | |
3737 | */ | |
3738 | last = found_key.offset; | |
3739 | last_for_get_extent = last + 1; | |
975f84fe | 3740 | } |
975f84fe JB |
3741 | btrfs_free_path(path); |
3742 | ||
ec29ed5b CM |
3743 | /* |
3744 | * we might have some extents allocated but more delalloc past those | |
3745 | * extents. so, we trust isize unless the start of the last extent is | |
3746 | * beyond isize | |
3747 | */ | |
3748 | if (last < isize) { | |
3749 | last = (u64)-1; | |
3750 | last_for_get_extent = isize; | |
3751 | } | |
3752 | ||
2ac55d41 JB |
3753 | lock_extent_bits(&BTRFS_I(inode)->io_tree, start, start + len, 0, |
3754 | &cached_state, GFP_NOFS); | |
ec29ed5b | 3755 | |
4d479cf0 | 3756 | em = get_extent_skip_holes(inode, start, last_for_get_extent, |
ec29ed5b | 3757 | get_extent); |
1506fcc8 YS |
3758 | if (!em) |
3759 | goto out; | |
3760 | if (IS_ERR(em)) { | |
3761 | ret = PTR_ERR(em); | |
3762 | goto out; | |
3763 | } | |
975f84fe | 3764 | |
1506fcc8 | 3765 | while (!end) { |
ea8efc74 CM |
3766 | u64 offset_in_extent; |
3767 | ||
3768 | /* break if the extent we found is outside the range */ | |
3769 | if (em->start >= max || extent_map_end(em) < off) | |
3770 | break; | |
3771 | ||
3772 | /* | |
3773 | * get_extent may return an extent that starts before our | |
3774 | * requested range. We have to make sure the ranges | |
3775 | * we return to fiemap always move forward and don't | |
3776 | * overlap, so adjust the offsets here | |
3777 | */ | |
3778 | em_start = max(em->start, off); | |
1506fcc8 | 3779 | |
ea8efc74 CM |
3780 | /* |
3781 | * record the offset from the start of the extent | |
3782 | * for adjusting the disk offset below | |
3783 | */ | |
3784 | offset_in_extent = em_start - em->start; | |
ec29ed5b | 3785 | em_end = extent_map_end(em); |
ea8efc74 | 3786 | em_len = em_end - em_start; |
ec29ed5b | 3787 | emflags = em->flags; |
1506fcc8 YS |
3788 | disko = 0; |
3789 | flags = 0; | |
3790 | ||
ea8efc74 CM |
3791 | /* |
3792 | * bump off for our next call to get_extent | |
3793 | */ | |
3794 | off = extent_map_end(em); | |
3795 | if (off >= max) | |
3796 | end = 1; | |
3797 | ||
93dbfad7 | 3798 | if (em->block_start == EXTENT_MAP_LAST_BYTE) { |
1506fcc8 YS |
3799 | end = 1; |
3800 | flags |= FIEMAP_EXTENT_LAST; | |
93dbfad7 | 3801 | } else if (em->block_start == EXTENT_MAP_INLINE) { |
1506fcc8 YS |
3802 | flags |= (FIEMAP_EXTENT_DATA_INLINE | |
3803 | FIEMAP_EXTENT_NOT_ALIGNED); | |
93dbfad7 | 3804 | } else if (em->block_start == EXTENT_MAP_DELALLOC) { |
1506fcc8 YS |
3805 | flags |= (FIEMAP_EXTENT_DELALLOC | |
3806 | FIEMAP_EXTENT_UNKNOWN); | |
93dbfad7 | 3807 | } else { |
ea8efc74 | 3808 | disko = em->block_start + offset_in_extent; |
1506fcc8 YS |
3809 | } |
3810 | if (test_bit(EXTENT_FLAG_COMPRESSED, &em->flags)) | |
3811 | flags |= FIEMAP_EXTENT_ENCODED; | |
3812 | ||
1506fcc8 YS |
3813 | free_extent_map(em); |
3814 | em = NULL; | |
ec29ed5b CM |
3815 | if ((em_start >= last) || em_len == (u64)-1 || |
3816 | (last == (u64)-1 && isize <= em_end)) { | |
1506fcc8 YS |
3817 | flags |= FIEMAP_EXTENT_LAST; |
3818 | end = 1; | |
3819 | } | |
3820 | ||
ec29ed5b CM |
3821 | /* now scan forward to see if this is really the last extent. */ |
3822 | em = get_extent_skip_holes(inode, off, last_for_get_extent, | |
3823 | get_extent); | |
3824 | if (IS_ERR(em)) { | |
3825 | ret = PTR_ERR(em); | |
3826 | goto out; | |
3827 | } | |
3828 | if (!em) { | |
975f84fe JB |
3829 | flags |= FIEMAP_EXTENT_LAST; |
3830 | end = 1; | |
3831 | } | |
ec29ed5b CM |
3832 | ret = fiemap_fill_next_extent(fieinfo, em_start, disko, |
3833 | em_len, flags); | |
3834 | if (ret) | |
3835 | goto out_free; | |
1506fcc8 YS |
3836 | } |
3837 | out_free: | |
3838 | free_extent_map(em); | |
3839 | out: | |
2ac55d41 JB |
3840 | unlock_extent_cached(&BTRFS_I(inode)->io_tree, start, start + len, |
3841 | &cached_state, GFP_NOFS); | |
1506fcc8 YS |
3842 | return ret; |
3843 | } | |
3844 | ||
4a54c8c1 | 3845 | inline struct page *extent_buffer_page(struct extent_buffer *eb, |
d1310b2e CM |
3846 | unsigned long i) |
3847 | { | |
727011e0 | 3848 | return eb->pages[i]; |
d1310b2e CM |
3849 | } |
3850 | ||
4a54c8c1 | 3851 | inline unsigned long num_extent_pages(u64 start, u64 len) |
728131d8 | 3852 | { |
6af118ce CM |
3853 | return ((start + len + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT) - |
3854 | (start >> PAGE_CACHE_SHIFT); | |
728131d8 CM |
3855 | } |
3856 | ||
727011e0 CM |
3857 | static void __free_extent_buffer(struct extent_buffer *eb) |
3858 | { | |
3859 | #if LEAK_DEBUG | |
3860 | unsigned long flags; | |
3861 | spin_lock_irqsave(&leak_lock, flags); | |
3862 | list_del(&eb->leak_list); | |
3863 | spin_unlock_irqrestore(&leak_lock, flags); | |
3864 | #endif | |
3865 | if (eb->pages && eb->pages != eb->inline_pages) | |
3866 | kfree(eb->pages); | |
3867 | kmem_cache_free(extent_buffer_cache, eb); | |
3868 | } | |
3869 | ||
d1310b2e CM |
3870 | static struct extent_buffer *__alloc_extent_buffer(struct extent_io_tree *tree, |
3871 | u64 start, | |
3872 | unsigned long len, | |
3873 | gfp_t mask) | |
3874 | { | |
3875 | struct extent_buffer *eb = NULL; | |
3935127c | 3876 | #if LEAK_DEBUG |
2d2ae547 | 3877 | unsigned long flags; |
4bef0848 | 3878 | #endif |
d1310b2e | 3879 | |
d1310b2e | 3880 | eb = kmem_cache_zalloc(extent_buffer_cache, mask); |
91ca338d TI |
3881 | if (eb == NULL) |
3882 | return NULL; | |
d1310b2e CM |
3883 | eb->start = start; |
3884 | eb->len = len; | |
4f2de97a | 3885 | eb->tree = tree; |
bd681513 CM |
3886 | rwlock_init(&eb->lock); |
3887 | atomic_set(&eb->write_locks, 0); | |
3888 | atomic_set(&eb->read_locks, 0); | |
3889 | atomic_set(&eb->blocking_readers, 0); | |
3890 | atomic_set(&eb->blocking_writers, 0); | |
3891 | atomic_set(&eb->spinning_readers, 0); | |
3892 | atomic_set(&eb->spinning_writers, 0); | |
5b25f70f | 3893 | eb->lock_nested = 0; |
bd681513 CM |
3894 | init_waitqueue_head(&eb->write_lock_wq); |
3895 | init_waitqueue_head(&eb->read_lock_wq); | |
b4ce94de | 3896 | |
3935127c | 3897 | #if LEAK_DEBUG |
2d2ae547 CM |
3898 | spin_lock_irqsave(&leak_lock, flags); |
3899 | list_add(&eb->leak_list, &buffers); | |
3900 | spin_unlock_irqrestore(&leak_lock, flags); | |
4bef0848 | 3901 | #endif |
3083ee2e | 3902 | spin_lock_init(&eb->refs_lock); |
d1310b2e | 3903 | atomic_set(&eb->refs, 1); |
0b32f4bb | 3904 | atomic_set(&eb->io_pages, 0); |
727011e0 CM |
3905 | |
3906 | if (len > MAX_INLINE_EXTENT_BUFFER_SIZE) { | |
3907 | struct page **pages; | |
3908 | int num_pages = (len + PAGE_CACHE_SIZE - 1) >> | |
3909 | PAGE_CACHE_SHIFT; | |
3910 | pages = kzalloc(num_pages, mask); | |
3911 | if (!pages) { | |
3912 | __free_extent_buffer(eb); | |
3913 | return NULL; | |
3914 | } | |
3915 | eb->pages = pages; | |
3916 | } else { | |
3917 | eb->pages = eb->inline_pages; | |
3918 | } | |
d1310b2e CM |
3919 | |
3920 | return eb; | |
3921 | } | |
3922 | ||
0b32f4bb JB |
3923 | static int extent_buffer_under_io(struct extent_buffer *eb) |
3924 | { | |
3925 | return (atomic_read(&eb->io_pages) || | |
3926 | test_bit(EXTENT_BUFFER_WRITEBACK, &eb->bflags) || | |
3927 | test_bit(EXTENT_BUFFER_DIRTY, &eb->bflags)); | |
3928 | } | |
3929 | ||
897ca6e9 MX |
3930 | /* |
3931 | * Helper for releasing extent buffer page. | |
3932 | */ | |
3933 | static void btrfs_release_extent_buffer_page(struct extent_buffer *eb, | |
3934 | unsigned long start_idx) | |
3935 | { | |
3936 | unsigned long index; | |
3937 | struct page *page; | |
3938 | ||
0b32f4bb JB |
3939 | BUG_ON(extent_buffer_under_io(eb)); |
3940 | ||
897ca6e9 MX |
3941 | index = num_extent_pages(eb->start, eb->len); |
3942 | if (start_idx >= index) | |
3943 | return; | |
3944 | ||
3945 | do { | |
3946 | index--; | |
3947 | page = extent_buffer_page(eb, index); | |
4f2de97a JB |
3948 | if (page) { |
3949 | spin_lock(&page->mapping->private_lock); | |
3950 | /* | |
3951 | * We do this since we'll remove the pages after we've | |
3952 | * removed the eb from the radix tree, so we could race | |
3953 | * and have this page now attached to the new eb. So | |
3954 | * only clear page_private if it's still connected to | |
3955 | * this eb. | |
3956 | */ | |
3957 | if (PagePrivate(page) && | |
3958 | page->private == (unsigned long)eb) { | |
0b32f4bb | 3959 | BUG_ON(test_bit(EXTENT_BUFFER_DIRTY, &eb->bflags)); |
3083ee2e JB |
3960 | BUG_ON(PageDirty(page)); |
3961 | BUG_ON(PageWriteback(page)); | |
4f2de97a JB |
3962 | /* |
3963 | * We need to make sure we haven't be attached | |
3964 | * to a new eb. | |
3965 | */ | |
3966 | ClearPagePrivate(page); | |
3967 | set_page_private(page, 0); | |
3968 | /* One for the page private */ | |
3969 | page_cache_release(page); | |
3970 | } | |
3971 | spin_unlock(&page->mapping->private_lock); | |
3972 | ||
3973 | /* One for when we alloced the page */ | |
897ca6e9 | 3974 | page_cache_release(page); |
4f2de97a | 3975 | } |
897ca6e9 MX |
3976 | } while (index != start_idx); |
3977 | } | |
3978 | ||
3979 | /* | |
3980 | * Helper for releasing the extent buffer. | |
3981 | */ | |
3982 | static inline void btrfs_release_extent_buffer(struct extent_buffer *eb) | |
3983 | { | |
3984 | btrfs_release_extent_buffer_page(eb, 0); | |
3985 | __free_extent_buffer(eb); | |
3986 | } | |
3987 | ||
0b32f4bb JB |
3988 | static void check_buffer_tree_ref(struct extent_buffer *eb) |
3989 | { | |
3990 | /* the ref bit is tricky. We have to make sure it is set | |
3991 | * if we have the buffer dirty. Otherwise the | |
3992 | * code to free a buffer can end up dropping a dirty | |
3993 | * page | |
3994 | * | |
3995 | * Once the ref bit is set, it won't go away while the | |
3996 | * buffer is dirty or in writeback, and it also won't | |
3997 | * go away while we have the reference count on the | |
3998 | * eb bumped. | |
3999 | * | |
4000 | * We can't just set the ref bit without bumping the | |
4001 | * ref on the eb because free_extent_buffer might | |
4002 | * see the ref bit and try to clear it. If this happens | |
4003 | * free_extent_buffer might end up dropping our original | |
4004 | * ref by mistake and freeing the page before we are able | |
4005 | * to add one more ref. | |
4006 | * | |
4007 | * So bump the ref count first, then set the bit. If someone | |
4008 | * beat us to it, drop the ref we added. | |
4009 | */ | |
4010 | if (!test_bit(EXTENT_BUFFER_TREE_REF, &eb->bflags)) { | |
4011 | atomic_inc(&eb->refs); | |
4012 | if (test_and_set_bit(EXTENT_BUFFER_TREE_REF, &eb->bflags)) | |
4013 | atomic_dec(&eb->refs); | |
4014 | } | |
4015 | } | |
4016 | ||
5df4235e JB |
4017 | static void mark_extent_buffer_accessed(struct extent_buffer *eb) |
4018 | { | |
4019 | unsigned long num_pages, i; | |
4020 | ||
0b32f4bb JB |
4021 | check_buffer_tree_ref(eb); |
4022 | ||
5df4235e JB |
4023 | num_pages = num_extent_pages(eb->start, eb->len); |
4024 | for (i = 0; i < num_pages; i++) { | |
4025 | struct page *p = extent_buffer_page(eb, i); | |
4026 | mark_page_accessed(p); | |
4027 | } | |
4028 | } | |
4029 | ||
d1310b2e | 4030 | struct extent_buffer *alloc_extent_buffer(struct extent_io_tree *tree, |
727011e0 | 4031 | u64 start, unsigned long len) |
d1310b2e CM |
4032 | { |
4033 | unsigned long num_pages = num_extent_pages(start, len); | |
4034 | unsigned long i; | |
4035 | unsigned long index = start >> PAGE_CACHE_SHIFT; | |
4036 | struct extent_buffer *eb; | |
6af118ce | 4037 | struct extent_buffer *exists = NULL; |
d1310b2e CM |
4038 | struct page *p; |
4039 | struct address_space *mapping = tree->mapping; | |
4040 | int uptodate = 1; | |
19fe0a8b | 4041 | int ret; |
d1310b2e | 4042 | |
19fe0a8b MX |
4043 | rcu_read_lock(); |
4044 | eb = radix_tree_lookup(&tree->buffer, start >> PAGE_CACHE_SHIFT); | |
4045 | if (eb && atomic_inc_not_zero(&eb->refs)) { | |
4046 | rcu_read_unlock(); | |
5df4235e | 4047 | mark_extent_buffer_accessed(eb); |
6af118ce CM |
4048 | return eb; |
4049 | } | |
19fe0a8b | 4050 | rcu_read_unlock(); |
6af118ce | 4051 | |
ba144192 | 4052 | eb = __alloc_extent_buffer(tree, start, len, GFP_NOFS); |
2b114d1d | 4053 | if (!eb) |
d1310b2e CM |
4054 | return NULL; |
4055 | ||
727011e0 | 4056 | for (i = 0; i < num_pages; i++, index++) { |
a6591715 | 4057 | p = find_or_create_page(mapping, index, GFP_NOFS); |
d1310b2e CM |
4058 | if (!p) { |
4059 | WARN_ON(1); | |
6af118ce | 4060 | goto free_eb; |
d1310b2e | 4061 | } |
4f2de97a JB |
4062 | |
4063 | spin_lock(&mapping->private_lock); | |
4064 | if (PagePrivate(p)) { | |
4065 | /* | |
4066 | * We could have already allocated an eb for this page | |
4067 | * and attached one so lets see if we can get a ref on | |
4068 | * the existing eb, and if we can we know it's good and | |
4069 | * we can just return that one, else we know we can just | |
4070 | * overwrite page->private. | |
4071 | */ | |
4072 | exists = (struct extent_buffer *)p->private; | |
4073 | if (atomic_inc_not_zero(&exists->refs)) { | |
4074 | spin_unlock(&mapping->private_lock); | |
4075 | unlock_page(p); | |
5df4235e | 4076 | mark_extent_buffer_accessed(exists); |
4f2de97a JB |
4077 | goto free_eb; |
4078 | } | |
4079 | ||
0b32f4bb | 4080 | /* |
4f2de97a JB |
4081 | * Do this so attach doesn't complain and we need to |
4082 | * drop the ref the old guy had. | |
4083 | */ | |
4084 | ClearPagePrivate(p); | |
0b32f4bb | 4085 | WARN_ON(PageDirty(p)); |
4f2de97a JB |
4086 | page_cache_release(p); |
4087 | } | |
4088 | attach_extent_buffer_page(eb, p); | |
4089 | spin_unlock(&mapping->private_lock); | |
0b32f4bb | 4090 | WARN_ON(PageDirty(p)); |
d1310b2e | 4091 | mark_page_accessed(p); |
727011e0 | 4092 | eb->pages[i] = p; |
d1310b2e CM |
4093 | if (!PageUptodate(p)) |
4094 | uptodate = 0; | |
eb14ab8e CM |
4095 | |
4096 | /* | |
4097 | * see below about how we avoid a nasty race with release page | |
4098 | * and why we unlock later | |
4099 | */ | |
d1310b2e CM |
4100 | } |
4101 | if (uptodate) | |
b4ce94de | 4102 | set_bit(EXTENT_BUFFER_UPTODATE, &eb->bflags); |
115391d2 | 4103 | again: |
19fe0a8b MX |
4104 | ret = radix_tree_preload(GFP_NOFS & ~__GFP_HIGHMEM); |
4105 | if (ret) | |
4106 | goto free_eb; | |
4107 | ||
6af118ce | 4108 | spin_lock(&tree->buffer_lock); |
19fe0a8b MX |
4109 | ret = radix_tree_insert(&tree->buffer, start >> PAGE_CACHE_SHIFT, eb); |
4110 | if (ret == -EEXIST) { | |
4111 | exists = radix_tree_lookup(&tree->buffer, | |
4112 | start >> PAGE_CACHE_SHIFT); | |
115391d2 JB |
4113 | if (!atomic_inc_not_zero(&exists->refs)) { |
4114 | spin_unlock(&tree->buffer_lock); | |
4115 | radix_tree_preload_end(); | |
115391d2 JB |
4116 | exists = NULL; |
4117 | goto again; | |
4118 | } | |
6af118ce | 4119 | spin_unlock(&tree->buffer_lock); |
19fe0a8b | 4120 | radix_tree_preload_end(); |
5df4235e | 4121 | mark_extent_buffer_accessed(exists); |
6af118ce CM |
4122 | goto free_eb; |
4123 | } | |
6af118ce | 4124 | /* add one reference for the tree */ |
3083ee2e | 4125 | spin_lock(&eb->refs_lock); |
0b32f4bb | 4126 | check_buffer_tree_ref(eb); |
3083ee2e | 4127 | spin_unlock(&eb->refs_lock); |
f044ba78 | 4128 | spin_unlock(&tree->buffer_lock); |
19fe0a8b | 4129 | radix_tree_preload_end(); |
eb14ab8e CM |
4130 | |
4131 | /* | |
4132 | * there is a race where release page may have | |
4133 | * tried to find this extent buffer in the radix | |
4134 | * but failed. It will tell the VM it is safe to | |
4135 | * reclaim the, and it will clear the page private bit. | |
4136 | * We must make sure to set the page private bit properly | |
4137 | * after the extent buffer is in the radix tree so | |
4138 | * it doesn't get lost | |
4139 | */ | |
727011e0 CM |
4140 | SetPageChecked(eb->pages[0]); |
4141 | for (i = 1; i < num_pages; i++) { | |
4142 | p = extent_buffer_page(eb, i); | |
727011e0 CM |
4143 | ClearPageChecked(p); |
4144 | unlock_page(p); | |
4145 | } | |
4146 | unlock_page(eb->pages[0]); | |
d1310b2e CM |
4147 | return eb; |
4148 | ||
6af118ce | 4149 | free_eb: |
727011e0 CM |
4150 | for (i = 0; i < num_pages; i++) { |
4151 | if (eb->pages[i]) | |
4152 | unlock_page(eb->pages[i]); | |
4153 | } | |
eb14ab8e | 4154 | |
d1310b2e | 4155 | if (!atomic_dec_and_test(&eb->refs)) |
6af118ce | 4156 | return exists; |
897ca6e9 | 4157 | btrfs_release_extent_buffer(eb); |
6af118ce | 4158 | return exists; |
d1310b2e | 4159 | } |
d1310b2e CM |
4160 | |
4161 | struct extent_buffer *find_extent_buffer(struct extent_io_tree *tree, | |
f09d1f60 | 4162 | u64 start, unsigned long len) |
d1310b2e | 4163 | { |
d1310b2e | 4164 | struct extent_buffer *eb; |
d1310b2e | 4165 | |
19fe0a8b MX |
4166 | rcu_read_lock(); |
4167 | eb = radix_tree_lookup(&tree->buffer, start >> PAGE_CACHE_SHIFT); | |
4168 | if (eb && atomic_inc_not_zero(&eb->refs)) { | |
4169 | rcu_read_unlock(); | |
5df4235e | 4170 | mark_extent_buffer_accessed(eb); |
19fe0a8b MX |
4171 | return eb; |
4172 | } | |
4173 | rcu_read_unlock(); | |
0f9dd46c | 4174 | |
19fe0a8b | 4175 | return NULL; |
d1310b2e | 4176 | } |
d1310b2e | 4177 | |
3083ee2e JB |
4178 | static inline void btrfs_release_extent_buffer_rcu(struct rcu_head *head) |
4179 | { | |
4180 | struct extent_buffer *eb = | |
4181 | container_of(head, struct extent_buffer, rcu_head); | |
4182 | ||
4183 | __free_extent_buffer(eb); | |
4184 | } | |
4185 | ||
3083ee2e JB |
4186 | /* Expects to have eb->eb_lock already held */ |
4187 | static void release_extent_buffer(struct extent_buffer *eb, gfp_t mask) | |
4188 | { | |
4189 | WARN_ON(atomic_read(&eb->refs) == 0); | |
4190 | if (atomic_dec_and_test(&eb->refs)) { | |
4191 | struct extent_io_tree *tree = eb->tree; | |
3083ee2e JB |
4192 | |
4193 | spin_unlock(&eb->refs_lock); | |
4194 | ||
3083ee2e JB |
4195 | spin_lock(&tree->buffer_lock); |
4196 | radix_tree_delete(&tree->buffer, | |
4197 | eb->start >> PAGE_CACHE_SHIFT); | |
4198 | spin_unlock(&tree->buffer_lock); | |
4199 | ||
4200 | /* Should be safe to release our pages at this point */ | |
4201 | btrfs_release_extent_buffer_page(eb, 0); | |
4202 | ||
4203 | call_rcu(&eb->rcu_head, btrfs_release_extent_buffer_rcu); | |
4204 | return; | |
4205 | } | |
4206 | spin_unlock(&eb->refs_lock); | |
4207 | } | |
4208 | ||
d1310b2e CM |
4209 | void free_extent_buffer(struct extent_buffer *eb) |
4210 | { | |
d1310b2e CM |
4211 | if (!eb) |
4212 | return; | |
4213 | ||
3083ee2e JB |
4214 | spin_lock(&eb->refs_lock); |
4215 | if (atomic_read(&eb->refs) == 2 && | |
4216 | test_bit(EXTENT_BUFFER_STALE, &eb->bflags) && | |
0b32f4bb | 4217 | !extent_buffer_under_io(eb) && |
3083ee2e JB |
4218 | test_and_clear_bit(EXTENT_BUFFER_TREE_REF, &eb->bflags)) |
4219 | atomic_dec(&eb->refs); | |
4220 | ||
4221 | /* | |
4222 | * I know this is terrible, but it's temporary until we stop tracking | |
4223 | * the uptodate bits and such for the extent buffers. | |
4224 | */ | |
4225 | release_extent_buffer(eb, GFP_ATOMIC); | |
4226 | } | |
4227 | ||
4228 | void free_extent_buffer_stale(struct extent_buffer *eb) | |
4229 | { | |
4230 | if (!eb) | |
d1310b2e CM |
4231 | return; |
4232 | ||
3083ee2e JB |
4233 | spin_lock(&eb->refs_lock); |
4234 | set_bit(EXTENT_BUFFER_STALE, &eb->bflags); | |
4235 | ||
0b32f4bb | 4236 | if (atomic_read(&eb->refs) == 2 && !extent_buffer_under_io(eb) && |
3083ee2e JB |
4237 | test_and_clear_bit(EXTENT_BUFFER_TREE_REF, &eb->bflags)) |
4238 | atomic_dec(&eb->refs); | |
4239 | release_extent_buffer(eb, GFP_NOFS); | |
d1310b2e | 4240 | } |
d1310b2e | 4241 | |
0b32f4bb | 4242 | int clear_extent_buffer_dirty(struct extent_buffer *eb) |
d1310b2e | 4243 | { |
d1310b2e CM |
4244 | unsigned long i; |
4245 | unsigned long num_pages; | |
4246 | struct page *page; | |
4247 | ||
d1310b2e | 4248 | num_pages = num_extent_pages(eb->start, eb->len); |
0b32f4bb | 4249 | WARN_ON(atomic_read(&eb->refs) == 0); |
d1310b2e CM |
4250 | |
4251 | for (i = 0; i < num_pages; i++) { | |
4252 | page = extent_buffer_page(eb, i); | |
b9473439 | 4253 | if (!PageDirty(page)) |
d2c3f4f6 CM |
4254 | continue; |
4255 | ||
a61e6f29 | 4256 | lock_page(page); |
eb14ab8e CM |
4257 | WARN_ON(!PagePrivate(page)); |
4258 | ||
d1310b2e | 4259 | clear_page_dirty_for_io(page); |
0ee0fda0 | 4260 | spin_lock_irq(&page->mapping->tree_lock); |
d1310b2e CM |
4261 | if (!PageDirty(page)) { |
4262 | radix_tree_tag_clear(&page->mapping->page_tree, | |
4263 | page_index(page), | |
4264 | PAGECACHE_TAG_DIRTY); | |
4265 | } | |
0ee0fda0 | 4266 | spin_unlock_irq(&page->mapping->tree_lock); |
bf0da8c1 | 4267 | ClearPageError(page); |
a61e6f29 | 4268 | unlock_page(page); |
d1310b2e | 4269 | } |
0b32f4bb | 4270 | WARN_ON(atomic_read(&eb->refs) == 0); |
d1310b2e CM |
4271 | return 0; |
4272 | } | |
d1310b2e | 4273 | |
0b32f4bb | 4274 | int set_extent_buffer_dirty(struct extent_buffer *eb) |
d1310b2e CM |
4275 | { |
4276 | unsigned long i; | |
4277 | unsigned long num_pages; | |
b9473439 | 4278 | int was_dirty = 0; |
d1310b2e | 4279 | |
0b32f4bb JB |
4280 | check_buffer_tree_ref(eb); |
4281 | ||
b9473439 | 4282 | was_dirty = test_and_set_bit(EXTENT_BUFFER_DIRTY, &eb->bflags); |
0b32f4bb | 4283 | |
d1310b2e | 4284 | num_pages = num_extent_pages(eb->start, eb->len); |
3083ee2e | 4285 | WARN_ON(atomic_read(&eb->refs) == 0); |
0b32f4bb JB |
4286 | WARN_ON(!test_bit(EXTENT_BUFFER_TREE_REF, &eb->bflags)); |
4287 | ||
b9473439 | 4288 | for (i = 0; i < num_pages; i++) |
0b32f4bb | 4289 | set_page_dirty(extent_buffer_page(eb, i)); |
b9473439 | 4290 | return was_dirty; |
d1310b2e | 4291 | } |
d1310b2e | 4292 | |
0b32f4bb | 4293 | static int range_straddles_pages(u64 start, u64 len) |
19b6caf4 CM |
4294 | { |
4295 | if (len < PAGE_CACHE_SIZE) | |
4296 | return 1; | |
4297 | if (start & (PAGE_CACHE_SIZE - 1)) | |
4298 | return 1; | |
4299 | if ((start + len) & (PAGE_CACHE_SIZE - 1)) | |
4300 | return 1; | |
4301 | return 0; | |
4302 | } | |
4303 | ||
0b32f4bb | 4304 | int clear_extent_buffer_uptodate(struct extent_buffer *eb) |
1259ab75 CM |
4305 | { |
4306 | unsigned long i; | |
4307 | struct page *page; | |
4308 | unsigned long num_pages; | |
4309 | ||
b4ce94de | 4310 | clear_bit(EXTENT_BUFFER_UPTODATE, &eb->bflags); |
0b32f4bb | 4311 | num_pages = num_extent_pages(eb->start, eb->len); |
1259ab75 CM |
4312 | for (i = 0; i < num_pages; i++) { |
4313 | page = extent_buffer_page(eb, i); | |
33958dc6 CM |
4314 | if (page) |
4315 | ClearPageUptodate(page); | |
1259ab75 CM |
4316 | } |
4317 | return 0; | |
4318 | } | |
4319 | ||
0b32f4bb | 4320 | int set_extent_buffer_uptodate(struct extent_buffer *eb) |
d1310b2e CM |
4321 | { |
4322 | unsigned long i; | |
4323 | struct page *page; | |
4324 | unsigned long num_pages; | |
4325 | ||
0b32f4bb | 4326 | set_bit(EXTENT_BUFFER_UPTODATE, &eb->bflags); |
d1310b2e | 4327 | num_pages = num_extent_pages(eb->start, eb->len); |
d1310b2e CM |
4328 | for (i = 0; i < num_pages; i++) { |
4329 | page = extent_buffer_page(eb, i); | |
d1310b2e CM |
4330 | SetPageUptodate(page); |
4331 | } | |
4332 | return 0; | |
4333 | } | |
d1310b2e | 4334 | |
ce9adaa5 CM |
4335 | int extent_range_uptodate(struct extent_io_tree *tree, |
4336 | u64 start, u64 end) | |
4337 | { | |
4338 | struct page *page; | |
4339 | int ret; | |
4340 | int pg_uptodate = 1; | |
4341 | int uptodate; | |
4342 | unsigned long index; | |
4343 | ||
0b32f4bb | 4344 | if (range_straddles_pages(start, end - start + 1)) { |
19b6caf4 CM |
4345 | ret = test_range_bit(tree, start, end, |
4346 | EXTENT_UPTODATE, 1, NULL); | |
4347 | if (ret) | |
4348 | return 1; | |
4349 | } | |
d397712b | 4350 | while (start <= end) { |
ce9adaa5 CM |
4351 | index = start >> PAGE_CACHE_SHIFT; |
4352 | page = find_get_page(tree->mapping, index); | |
8bedd51b MH |
4353 | if (!page) |
4354 | return 1; | |
ce9adaa5 CM |
4355 | uptodate = PageUptodate(page); |
4356 | page_cache_release(page); | |
4357 | if (!uptodate) { | |
4358 | pg_uptodate = 0; | |
4359 | break; | |
4360 | } | |
4361 | start += PAGE_CACHE_SIZE; | |
4362 | } | |
4363 | return pg_uptodate; | |
4364 | } | |
4365 | ||
0b32f4bb | 4366 | int extent_buffer_uptodate(struct extent_buffer *eb) |
d1310b2e | 4367 | { |
0b32f4bb | 4368 | return test_bit(EXTENT_BUFFER_UPTODATE, &eb->bflags); |
d1310b2e | 4369 | } |
d1310b2e CM |
4370 | |
4371 | int read_extent_buffer_pages(struct extent_io_tree *tree, | |
bb82ab88 | 4372 | struct extent_buffer *eb, u64 start, int wait, |
f188591e | 4373 | get_extent_t *get_extent, int mirror_num) |
d1310b2e CM |
4374 | { |
4375 | unsigned long i; | |
4376 | unsigned long start_i; | |
4377 | struct page *page; | |
4378 | int err; | |
4379 | int ret = 0; | |
ce9adaa5 CM |
4380 | int locked_pages = 0; |
4381 | int all_uptodate = 1; | |
d1310b2e | 4382 | unsigned long num_pages; |
727011e0 | 4383 | unsigned long num_reads = 0; |
a86c12c7 | 4384 | struct bio *bio = NULL; |
c8b97818 | 4385 | unsigned long bio_flags = 0; |
a86c12c7 | 4386 | |
b4ce94de | 4387 | if (test_bit(EXTENT_BUFFER_UPTODATE, &eb->bflags)) |
d1310b2e CM |
4388 | return 0; |
4389 | ||
d1310b2e CM |
4390 | if (start) { |
4391 | WARN_ON(start < eb->start); | |
4392 | start_i = (start >> PAGE_CACHE_SHIFT) - | |
4393 | (eb->start >> PAGE_CACHE_SHIFT); | |
4394 | } else { | |
4395 | start_i = 0; | |
4396 | } | |
4397 | ||
4398 | num_pages = num_extent_pages(eb->start, eb->len); | |
4399 | for (i = start_i; i < num_pages; i++) { | |
4400 | page = extent_buffer_page(eb, i); | |
bb82ab88 | 4401 | if (wait == WAIT_NONE) { |
2db04966 | 4402 | if (!trylock_page(page)) |
ce9adaa5 | 4403 | goto unlock_exit; |
d1310b2e CM |
4404 | } else { |
4405 | lock_page(page); | |
4406 | } | |
ce9adaa5 | 4407 | locked_pages++; |
727011e0 CM |
4408 | if (!PageUptodate(page)) { |
4409 | num_reads++; | |
ce9adaa5 | 4410 | all_uptodate = 0; |
727011e0 | 4411 | } |
ce9adaa5 CM |
4412 | } |
4413 | if (all_uptodate) { | |
4414 | if (start_i == 0) | |
b4ce94de | 4415 | set_bit(EXTENT_BUFFER_UPTODATE, &eb->bflags); |
ce9adaa5 CM |
4416 | goto unlock_exit; |
4417 | } | |
4418 | ||
ea466794 JB |
4419 | clear_bit(EXTENT_BUFFER_IOERR, &eb->bflags); |
4420 | eb->failed_mirror = 0; | |
0b32f4bb | 4421 | atomic_set(&eb->io_pages, num_reads); |
ce9adaa5 CM |
4422 | for (i = start_i; i < num_pages; i++) { |
4423 | page = extent_buffer_page(eb, i); | |
ce9adaa5 | 4424 | if (!PageUptodate(page)) { |
f188591e | 4425 | ClearPageError(page); |
a86c12c7 | 4426 | err = __extent_read_full_page(tree, page, |
f188591e | 4427 | get_extent, &bio, |
c8b97818 | 4428 | mirror_num, &bio_flags); |
d397712b | 4429 | if (err) |
d1310b2e | 4430 | ret = err; |
d1310b2e CM |
4431 | } else { |
4432 | unlock_page(page); | |
4433 | } | |
4434 | } | |
4435 | ||
a86c12c7 | 4436 | if (bio) |
c8b97818 | 4437 | submit_one_bio(READ, bio, mirror_num, bio_flags); |
a86c12c7 | 4438 | |
bb82ab88 | 4439 | if (ret || wait != WAIT_COMPLETE) |
d1310b2e | 4440 | return ret; |
d397712b | 4441 | |
d1310b2e CM |
4442 | for (i = start_i; i < num_pages; i++) { |
4443 | page = extent_buffer_page(eb, i); | |
4444 | wait_on_page_locked(page); | |
d397712b | 4445 | if (!PageUptodate(page)) |
d1310b2e | 4446 | ret = -EIO; |
d1310b2e | 4447 | } |
d397712b | 4448 | |
d1310b2e | 4449 | return ret; |
ce9adaa5 CM |
4450 | |
4451 | unlock_exit: | |
4452 | i = start_i; | |
d397712b | 4453 | while (locked_pages > 0) { |
ce9adaa5 CM |
4454 | page = extent_buffer_page(eb, i); |
4455 | i++; | |
4456 | unlock_page(page); | |
4457 | locked_pages--; | |
4458 | } | |
4459 | return ret; | |
d1310b2e | 4460 | } |
d1310b2e CM |
4461 | |
4462 | void read_extent_buffer(struct extent_buffer *eb, void *dstv, | |
4463 | unsigned long start, | |
4464 | unsigned long len) | |
4465 | { | |
4466 | size_t cur; | |
4467 | size_t offset; | |
4468 | struct page *page; | |
4469 | char *kaddr; | |
4470 | char *dst = (char *)dstv; | |
4471 | size_t start_offset = eb->start & ((u64)PAGE_CACHE_SIZE - 1); | |
4472 | unsigned long i = (start_offset + start) >> PAGE_CACHE_SHIFT; | |
d1310b2e CM |
4473 | |
4474 | WARN_ON(start > eb->len); | |
4475 | WARN_ON(start + len > eb->start + eb->len); | |
4476 | ||
4477 | offset = (start_offset + start) & ((unsigned long)PAGE_CACHE_SIZE - 1); | |
4478 | ||
d397712b | 4479 | while (len > 0) { |
d1310b2e | 4480 | page = extent_buffer_page(eb, i); |
d1310b2e CM |
4481 | |
4482 | cur = min(len, (PAGE_CACHE_SIZE - offset)); | |
a6591715 | 4483 | kaddr = page_address(page); |
d1310b2e | 4484 | memcpy(dst, kaddr + offset, cur); |
d1310b2e CM |
4485 | |
4486 | dst += cur; | |
4487 | len -= cur; | |
4488 | offset = 0; | |
4489 | i++; | |
4490 | } | |
4491 | } | |
d1310b2e CM |
4492 | |
4493 | int map_private_extent_buffer(struct extent_buffer *eb, unsigned long start, | |
a6591715 | 4494 | unsigned long min_len, char **map, |
d1310b2e | 4495 | unsigned long *map_start, |
a6591715 | 4496 | unsigned long *map_len) |
d1310b2e CM |
4497 | { |
4498 | size_t offset = start & (PAGE_CACHE_SIZE - 1); | |
4499 | char *kaddr; | |
4500 | struct page *p; | |
4501 | size_t start_offset = eb->start & ((u64)PAGE_CACHE_SIZE - 1); | |
4502 | unsigned long i = (start_offset + start) >> PAGE_CACHE_SHIFT; | |
4503 | unsigned long end_i = (start_offset + start + min_len - 1) >> | |
4504 | PAGE_CACHE_SHIFT; | |
4505 | ||
4506 | if (i != end_i) | |
4507 | return -EINVAL; | |
4508 | ||
4509 | if (i == 0) { | |
4510 | offset = start_offset; | |
4511 | *map_start = 0; | |
4512 | } else { | |
4513 | offset = 0; | |
4514 | *map_start = ((u64)i << PAGE_CACHE_SHIFT) - start_offset; | |
4515 | } | |
d397712b | 4516 | |
d1310b2e | 4517 | if (start + min_len > eb->len) { |
d397712b CM |
4518 | printk(KERN_ERR "btrfs bad mapping eb start %llu len %lu, " |
4519 | "wanted %lu %lu\n", (unsigned long long)eb->start, | |
4520 | eb->len, start, min_len); | |
d1310b2e | 4521 | WARN_ON(1); |
85026533 | 4522 | return -EINVAL; |
d1310b2e CM |
4523 | } |
4524 | ||
4525 | p = extent_buffer_page(eb, i); | |
a6591715 | 4526 | kaddr = page_address(p); |
d1310b2e CM |
4527 | *map = kaddr + offset; |
4528 | *map_len = PAGE_CACHE_SIZE - offset; | |
4529 | return 0; | |
4530 | } | |
d1310b2e | 4531 | |
d1310b2e CM |
4532 | int memcmp_extent_buffer(struct extent_buffer *eb, const void *ptrv, |
4533 | unsigned long start, | |
4534 | unsigned long len) | |
4535 | { | |
4536 | size_t cur; | |
4537 | size_t offset; | |
4538 | struct page *page; | |
4539 | char *kaddr; | |
4540 | char *ptr = (char *)ptrv; | |
4541 | size_t start_offset = eb->start & ((u64)PAGE_CACHE_SIZE - 1); | |
4542 | unsigned long i = (start_offset + start) >> PAGE_CACHE_SHIFT; | |
4543 | int ret = 0; | |
4544 | ||
4545 | WARN_ON(start > eb->len); | |
4546 | WARN_ON(start + len > eb->start + eb->len); | |
4547 | ||
4548 | offset = (start_offset + start) & ((unsigned long)PAGE_CACHE_SIZE - 1); | |
4549 | ||
d397712b | 4550 | while (len > 0) { |
d1310b2e | 4551 | page = extent_buffer_page(eb, i); |
d1310b2e CM |
4552 | |
4553 | cur = min(len, (PAGE_CACHE_SIZE - offset)); | |
4554 | ||
a6591715 | 4555 | kaddr = page_address(page); |
d1310b2e | 4556 | ret = memcmp(ptr, kaddr + offset, cur); |
d1310b2e CM |
4557 | if (ret) |
4558 | break; | |
4559 | ||
4560 | ptr += cur; | |
4561 | len -= cur; | |
4562 | offset = 0; | |
4563 | i++; | |
4564 | } | |
4565 | return ret; | |
4566 | } | |
d1310b2e CM |
4567 | |
4568 | void write_extent_buffer(struct extent_buffer *eb, const void *srcv, | |
4569 | unsigned long start, unsigned long len) | |
4570 | { | |
4571 | size_t cur; | |
4572 | size_t offset; | |
4573 | struct page *page; | |
4574 | char *kaddr; | |
4575 | char *src = (char *)srcv; | |
4576 | size_t start_offset = eb->start & ((u64)PAGE_CACHE_SIZE - 1); | |
4577 | unsigned long i = (start_offset + start) >> PAGE_CACHE_SHIFT; | |
4578 | ||
4579 | WARN_ON(start > eb->len); | |
4580 | WARN_ON(start + len > eb->start + eb->len); | |
4581 | ||
4582 | offset = (start_offset + start) & ((unsigned long)PAGE_CACHE_SIZE - 1); | |
4583 | ||
d397712b | 4584 | while (len > 0) { |
d1310b2e CM |
4585 | page = extent_buffer_page(eb, i); |
4586 | WARN_ON(!PageUptodate(page)); | |
4587 | ||
4588 | cur = min(len, PAGE_CACHE_SIZE - offset); | |
a6591715 | 4589 | kaddr = page_address(page); |
d1310b2e | 4590 | memcpy(kaddr + offset, src, cur); |
d1310b2e CM |
4591 | |
4592 | src += cur; | |
4593 | len -= cur; | |
4594 | offset = 0; | |
4595 | i++; | |
4596 | } | |
4597 | } | |
d1310b2e CM |
4598 | |
4599 | void memset_extent_buffer(struct extent_buffer *eb, char c, | |
4600 | unsigned long start, unsigned long len) | |
4601 | { | |
4602 | size_t cur; | |
4603 | size_t offset; | |
4604 | struct page *page; | |
4605 | char *kaddr; | |
4606 | size_t start_offset = eb->start & ((u64)PAGE_CACHE_SIZE - 1); | |
4607 | unsigned long i = (start_offset + start) >> PAGE_CACHE_SHIFT; | |
4608 | ||
4609 | WARN_ON(start > eb->len); | |
4610 | WARN_ON(start + len > eb->start + eb->len); | |
4611 | ||
4612 | offset = (start_offset + start) & ((unsigned long)PAGE_CACHE_SIZE - 1); | |
4613 | ||
d397712b | 4614 | while (len > 0) { |
d1310b2e CM |
4615 | page = extent_buffer_page(eb, i); |
4616 | WARN_ON(!PageUptodate(page)); | |
4617 | ||
4618 | cur = min(len, PAGE_CACHE_SIZE - offset); | |
a6591715 | 4619 | kaddr = page_address(page); |
d1310b2e | 4620 | memset(kaddr + offset, c, cur); |
d1310b2e CM |
4621 | |
4622 | len -= cur; | |
4623 | offset = 0; | |
4624 | i++; | |
4625 | } | |
4626 | } | |
d1310b2e CM |
4627 | |
4628 | void copy_extent_buffer(struct extent_buffer *dst, struct extent_buffer *src, | |
4629 | unsigned long dst_offset, unsigned long src_offset, | |
4630 | unsigned long len) | |
4631 | { | |
4632 | u64 dst_len = dst->len; | |
4633 | size_t cur; | |
4634 | size_t offset; | |
4635 | struct page *page; | |
4636 | char *kaddr; | |
4637 | size_t start_offset = dst->start & ((u64)PAGE_CACHE_SIZE - 1); | |
4638 | unsigned long i = (start_offset + dst_offset) >> PAGE_CACHE_SHIFT; | |
4639 | ||
4640 | WARN_ON(src->len != dst_len); | |
4641 | ||
4642 | offset = (start_offset + dst_offset) & | |
4643 | ((unsigned long)PAGE_CACHE_SIZE - 1); | |
4644 | ||
d397712b | 4645 | while (len > 0) { |
d1310b2e CM |
4646 | page = extent_buffer_page(dst, i); |
4647 | WARN_ON(!PageUptodate(page)); | |
4648 | ||
4649 | cur = min(len, (unsigned long)(PAGE_CACHE_SIZE - offset)); | |
4650 | ||
a6591715 | 4651 | kaddr = page_address(page); |
d1310b2e | 4652 | read_extent_buffer(src, kaddr + offset, src_offset, cur); |
d1310b2e CM |
4653 | |
4654 | src_offset += cur; | |
4655 | len -= cur; | |
4656 | offset = 0; | |
4657 | i++; | |
4658 | } | |
4659 | } | |
d1310b2e CM |
4660 | |
4661 | static void move_pages(struct page *dst_page, struct page *src_page, | |
4662 | unsigned long dst_off, unsigned long src_off, | |
4663 | unsigned long len) | |
4664 | { | |
a6591715 | 4665 | char *dst_kaddr = page_address(dst_page); |
d1310b2e CM |
4666 | if (dst_page == src_page) { |
4667 | memmove(dst_kaddr + dst_off, dst_kaddr + src_off, len); | |
4668 | } else { | |
a6591715 | 4669 | char *src_kaddr = page_address(src_page); |
d1310b2e CM |
4670 | char *p = dst_kaddr + dst_off + len; |
4671 | char *s = src_kaddr + src_off + len; | |
4672 | ||
4673 | while (len--) | |
4674 | *--p = *--s; | |
d1310b2e | 4675 | } |
d1310b2e CM |
4676 | } |
4677 | ||
3387206f ST |
4678 | static inline bool areas_overlap(unsigned long src, unsigned long dst, unsigned long len) |
4679 | { | |
4680 | unsigned long distance = (src > dst) ? src - dst : dst - src; | |
4681 | return distance < len; | |
4682 | } | |
4683 | ||
d1310b2e CM |
4684 | static void copy_pages(struct page *dst_page, struct page *src_page, |
4685 | unsigned long dst_off, unsigned long src_off, | |
4686 | unsigned long len) | |
4687 | { | |
a6591715 | 4688 | char *dst_kaddr = page_address(dst_page); |
d1310b2e | 4689 | char *src_kaddr; |
727011e0 | 4690 | int must_memmove = 0; |
d1310b2e | 4691 | |
3387206f | 4692 | if (dst_page != src_page) { |
a6591715 | 4693 | src_kaddr = page_address(src_page); |
3387206f | 4694 | } else { |
d1310b2e | 4695 | src_kaddr = dst_kaddr; |
727011e0 CM |
4696 | if (areas_overlap(src_off, dst_off, len)) |
4697 | must_memmove = 1; | |
3387206f | 4698 | } |
d1310b2e | 4699 | |
727011e0 CM |
4700 | if (must_memmove) |
4701 | memmove(dst_kaddr + dst_off, src_kaddr + src_off, len); | |
4702 | else | |
4703 | memcpy(dst_kaddr + dst_off, src_kaddr + src_off, len); | |
d1310b2e CM |
4704 | } |
4705 | ||
4706 | void memcpy_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset, | |
4707 | unsigned long src_offset, unsigned long len) | |
4708 | { | |
4709 | size_t cur; | |
4710 | size_t dst_off_in_page; | |
4711 | size_t src_off_in_page; | |
4712 | size_t start_offset = dst->start & ((u64)PAGE_CACHE_SIZE - 1); | |
4713 | unsigned long dst_i; | |
4714 | unsigned long src_i; | |
4715 | ||
4716 | if (src_offset + len > dst->len) { | |
d397712b CM |
4717 | printk(KERN_ERR "btrfs memmove bogus src_offset %lu move " |
4718 | "len %lu dst len %lu\n", src_offset, len, dst->len); | |
d1310b2e CM |
4719 | BUG_ON(1); |
4720 | } | |
4721 | if (dst_offset + len > dst->len) { | |
d397712b CM |
4722 | printk(KERN_ERR "btrfs memmove bogus dst_offset %lu move " |
4723 | "len %lu dst len %lu\n", dst_offset, len, dst->len); | |
d1310b2e CM |
4724 | BUG_ON(1); |
4725 | } | |
4726 | ||
d397712b | 4727 | while (len > 0) { |
d1310b2e CM |
4728 | dst_off_in_page = (start_offset + dst_offset) & |
4729 | ((unsigned long)PAGE_CACHE_SIZE - 1); | |
4730 | src_off_in_page = (start_offset + src_offset) & | |
4731 | ((unsigned long)PAGE_CACHE_SIZE - 1); | |
4732 | ||
4733 | dst_i = (start_offset + dst_offset) >> PAGE_CACHE_SHIFT; | |
4734 | src_i = (start_offset + src_offset) >> PAGE_CACHE_SHIFT; | |
4735 | ||
4736 | cur = min(len, (unsigned long)(PAGE_CACHE_SIZE - | |
4737 | src_off_in_page)); | |
4738 | cur = min_t(unsigned long, cur, | |
4739 | (unsigned long)(PAGE_CACHE_SIZE - dst_off_in_page)); | |
4740 | ||
4741 | copy_pages(extent_buffer_page(dst, dst_i), | |
4742 | extent_buffer_page(dst, src_i), | |
4743 | dst_off_in_page, src_off_in_page, cur); | |
4744 | ||
4745 | src_offset += cur; | |
4746 | dst_offset += cur; | |
4747 | len -= cur; | |
4748 | } | |
4749 | } | |
d1310b2e CM |
4750 | |
4751 | void memmove_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset, | |
4752 | unsigned long src_offset, unsigned long len) | |
4753 | { | |
4754 | size_t cur; | |
4755 | size_t dst_off_in_page; | |
4756 | size_t src_off_in_page; | |
4757 | unsigned long dst_end = dst_offset + len - 1; | |
4758 | unsigned long src_end = src_offset + len - 1; | |
4759 | size_t start_offset = dst->start & ((u64)PAGE_CACHE_SIZE - 1); | |
4760 | unsigned long dst_i; | |
4761 | unsigned long src_i; | |
4762 | ||
4763 | if (src_offset + len > dst->len) { | |
d397712b CM |
4764 | printk(KERN_ERR "btrfs memmove bogus src_offset %lu move " |
4765 | "len %lu len %lu\n", src_offset, len, dst->len); | |
d1310b2e CM |
4766 | BUG_ON(1); |
4767 | } | |
4768 | if (dst_offset + len > dst->len) { | |
d397712b CM |
4769 | printk(KERN_ERR "btrfs memmove bogus dst_offset %lu move " |
4770 | "len %lu len %lu\n", dst_offset, len, dst->len); | |
d1310b2e CM |
4771 | BUG_ON(1); |
4772 | } | |
727011e0 | 4773 | if (dst_offset < src_offset) { |
d1310b2e CM |
4774 | memcpy_extent_buffer(dst, dst_offset, src_offset, len); |
4775 | return; | |
4776 | } | |
d397712b | 4777 | while (len > 0) { |
d1310b2e CM |
4778 | dst_i = (start_offset + dst_end) >> PAGE_CACHE_SHIFT; |
4779 | src_i = (start_offset + src_end) >> PAGE_CACHE_SHIFT; | |
4780 | ||
4781 | dst_off_in_page = (start_offset + dst_end) & | |
4782 | ((unsigned long)PAGE_CACHE_SIZE - 1); | |
4783 | src_off_in_page = (start_offset + src_end) & | |
4784 | ((unsigned long)PAGE_CACHE_SIZE - 1); | |
4785 | ||
4786 | cur = min_t(unsigned long, len, src_off_in_page + 1); | |
4787 | cur = min(cur, dst_off_in_page + 1); | |
4788 | move_pages(extent_buffer_page(dst, dst_i), | |
4789 | extent_buffer_page(dst, src_i), | |
4790 | dst_off_in_page - cur + 1, | |
4791 | src_off_in_page - cur + 1, cur); | |
4792 | ||
4793 | dst_end -= cur; | |
4794 | src_end -= cur; | |
4795 | len -= cur; | |
4796 | } | |
4797 | } | |
6af118ce | 4798 | |
3083ee2e | 4799 | int try_release_extent_buffer(struct page *page, gfp_t mask) |
6af118ce | 4800 | { |
3083ee2e | 4801 | struct extent_buffer *eb; |
6af118ce | 4802 | |
3083ee2e JB |
4803 | /* |
4804 | * We need to make sure noboody is attaching this page to an eb right | |
4805 | * now. | |
4806 | */ | |
4807 | spin_lock(&page->mapping->private_lock); | |
4808 | if (!PagePrivate(page)) { | |
4809 | spin_unlock(&page->mapping->private_lock); | |
4f2de97a | 4810 | return 1; |
3083ee2e | 4811 | } |
6af118ce | 4812 | |
3083ee2e JB |
4813 | eb = (struct extent_buffer *)page->private; |
4814 | BUG_ON(!eb); | |
4815 | ||
0b32f4bb | 4816 | /* |
3083ee2e JB |
4817 | * This is a little awful but should be ok, we need to make sure that |
4818 | * the eb doesn't disappear out from under us while we're looking at | |
4819 | * this page. | |
4820 | */ | |
4821 | spin_lock(&eb->refs_lock); | |
0b32f4bb | 4822 | if (atomic_read(&eb->refs) != 1 || extent_buffer_under_io(eb)) { |
3083ee2e JB |
4823 | spin_unlock(&eb->refs_lock); |
4824 | spin_unlock(&page->mapping->private_lock); | |
4825 | return 0; | |
6af118ce | 4826 | } |
3083ee2e JB |
4827 | spin_unlock(&page->mapping->private_lock); |
4828 | ||
4829 | if ((mask & GFP_NOFS) == GFP_NOFS) | |
4830 | mask = GFP_NOFS; | |
19fe0a8b MX |
4831 | |
4832 | /* | |
3083ee2e JB |
4833 | * If tree ref isn't set then we know the ref on this eb is a real ref, |
4834 | * so just return, this page will likely be freed soon anyway. | |
19fe0a8b | 4835 | */ |
3083ee2e JB |
4836 | if (!test_and_clear_bit(EXTENT_BUFFER_TREE_REF, &eb->bflags)) { |
4837 | spin_unlock(&eb->refs_lock); | |
4838 | return 0; | |
b9473439 | 4839 | } |
3083ee2e | 4840 | release_extent_buffer(eb, mask); |
19fe0a8b | 4841 | |
3083ee2e | 4842 | return 1; |
6af118ce | 4843 | } |