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a52d9a80 CM |
1 | #include <linux/bitops.h> |
2 | #include <linux/slab.h> | |
3 | #include <linux/bio.h> | |
4 | #include <linux/mm.h> | |
5 | #include <linux/gfp.h> | |
6 | #include <linux/pagemap.h> | |
7 | #include <linux/page-flags.h> | |
8 | #include <linux/module.h> | |
9 | #include <linux/spinlock.h> | |
10 | #include <linux/blkdev.h> | |
4dc11904 | 11 | #include <linux/swap.h> |
0a2118df | 12 | #include <linux/version.h> |
b293f02e | 13 | #include <linux/writeback.h> |
3ab2fb5a | 14 | #include <linux/pagevec.h> |
a52d9a80 CM |
15 | #include "extent_map.h" |
16 | ||
86479a04 CM |
17 | /* temporary define until extent_map moves out of btrfs */ |
18 | struct kmem_cache *btrfs_cache_create(const char *name, size_t size, | |
19 | unsigned long extra_flags, | |
20 | void (*ctor)(void *, struct kmem_cache *, | |
21 | unsigned long)); | |
22 | ||
a52d9a80 CM |
23 | static struct kmem_cache *extent_map_cache; |
24 | static struct kmem_cache *extent_state_cache; | |
6d36dcd4 | 25 | static struct kmem_cache *extent_buffer_cache; |
f510cfec | 26 | |
f510cfec CM |
27 | static LIST_HEAD(buffers); |
28 | static LIST_HEAD(states); | |
29 | ||
f510cfec | 30 | static spinlock_t state_lock = SPIN_LOCK_UNLOCKED; |
4dc11904 | 31 | #define BUFFER_LRU_MAX 64 |
a52d9a80 CM |
32 | |
33 | struct tree_entry { | |
34 | u64 start; | |
35 | u64 end; | |
36 | int in_tree; | |
37 | struct rb_node rb_node; | |
38 | }; | |
39 | ||
b293f02e CM |
40 | struct extent_page_data { |
41 | struct bio *bio; | |
42 | struct extent_map_tree *tree; | |
43 | get_extent_t *get_extent; | |
44 | }; | |
2f4cbe64 | 45 | int __init extent_map_init(void) |
a52d9a80 | 46 | { |
86479a04 | 47 | extent_map_cache = btrfs_cache_create("extent_map", |
6d36dcd4 | 48 | sizeof(struct extent_map), 0, |
a52d9a80 | 49 | NULL); |
2f4cbe64 WB |
50 | if (!extent_map_cache) |
51 | return -ENOMEM; | |
86479a04 | 52 | extent_state_cache = btrfs_cache_create("extent_state", |
6d36dcd4 | 53 | sizeof(struct extent_state), 0, |
a52d9a80 | 54 | NULL); |
2f4cbe64 WB |
55 | if (!extent_state_cache) |
56 | goto free_map_cache; | |
6d36dcd4 CM |
57 | extent_buffer_cache = btrfs_cache_create("extent_buffers", |
58 | sizeof(struct extent_buffer), 0, | |
59 | NULL); | |
2f4cbe64 WB |
60 | if (!extent_buffer_cache) |
61 | goto free_state_cache; | |
62 | return 0; | |
63 | ||
64 | free_state_cache: | |
65 | kmem_cache_destroy(extent_state_cache); | |
66 | free_map_cache: | |
67 | kmem_cache_destroy(extent_map_cache); | |
68 | return -ENOMEM; | |
a52d9a80 CM |
69 | } |
70 | ||
71 | void __exit extent_map_exit(void) | |
72 | { | |
f510cfec | 73 | struct extent_state *state; |
6d36dcd4 | 74 | |
f510cfec CM |
75 | while (!list_empty(&states)) { |
76 | state = list_entry(states.next, struct extent_state, list); | |
77 | printk("state leak: start %Lu end %Lu state %lu in tree %d refs %d\n", state->start, state->end, state->state, state->in_tree, atomic_read(&state->refs)); | |
78 | list_del(&state->list); | |
79 | kmem_cache_free(extent_state_cache, state); | |
80 | ||
81 | } | |
f510cfec | 82 | |
a52d9a80 CM |
83 | if (extent_map_cache) |
84 | kmem_cache_destroy(extent_map_cache); | |
85 | if (extent_state_cache) | |
86 | kmem_cache_destroy(extent_state_cache); | |
6d36dcd4 CM |
87 | if (extent_buffer_cache) |
88 | kmem_cache_destroy(extent_buffer_cache); | |
a52d9a80 CM |
89 | } |
90 | ||
91 | void extent_map_tree_init(struct extent_map_tree *tree, | |
92 | struct address_space *mapping, gfp_t mask) | |
93 | { | |
94 | tree->map.rb_node = NULL; | |
95 | tree->state.rb_node = NULL; | |
07157aac | 96 | tree->ops = NULL; |
a52d9a80 | 97 | rwlock_init(&tree->lock); |
4dc11904 | 98 | spin_lock_init(&tree->lru_lock); |
a52d9a80 | 99 | tree->mapping = mapping; |
4dc11904 CM |
100 | INIT_LIST_HEAD(&tree->buffer_lru); |
101 | tree->lru_size = 0; | |
a52d9a80 CM |
102 | } |
103 | EXPORT_SYMBOL(extent_map_tree_init); | |
104 | ||
19c00ddc | 105 | void extent_map_tree_empty_lru(struct extent_map_tree *tree) |
4dc11904 CM |
106 | { |
107 | struct extent_buffer *eb; | |
108 | while(!list_empty(&tree->buffer_lru)) { | |
109 | eb = list_entry(tree->buffer_lru.next, struct extent_buffer, | |
110 | lru); | |
0591fb56 | 111 | list_del_init(&eb->lru); |
4dc11904 CM |
112 | free_extent_buffer(eb); |
113 | } | |
114 | } | |
19c00ddc | 115 | EXPORT_SYMBOL(extent_map_tree_empty_lru); |
4dc11904 | 116 | |
a52d9a80 CM |
117 | struct extent_map *alloc_extent_map(gfp_t mask) |
118 | { | |
119 | struct extent_map *em; | |
120 | em = kmem_cache_alloc(extent_map_cache, mask); | |
121 | if (!em || IS_ERR(em)) | |
122 | return em; | |
123 | em->in_tree = 0; | |
124 | atomic_set(&em->refs, 1); | |
125 | return em; | |
126 | } | |
127 | EXPORT_SYMBOL(alloc_extent_map); | |
128 | ||
129 | void free_extent_map(struct extent_map *em) | |
130 | { | |
2bf5a725 CM |
131 | if (!em) |
132 | return; | |
a52d9a80 CM |
133 | if (atomic_dec_and_test(&em->refs)) { |
134 | WARN_ON(em->in_tree); | |
135 | kmem_cache_free(extent_map_cache, em); | |
136 | } | |
137 | } | |
138 | EXPORT_SYMBOL(free_extent_map); | |
139 | ||
140 | ||
141 | struct extent_state *alloc_extent_state(gfp_t mask) | |
142 | { | |
143 | struct extent_state *state; | |
f510cfec CM |
144 | unsigned long flags; |
145 | ||
a52d9a80 CM |
146 | state = kmem_cache_alloc(extent_state_cache, mask); |
147 | if (!state || IS_ERR(state)) | |
148 | return state; | |
149 | state->state = 0; | |
150 | state->in_tree = 0; | |
07157aac | 151 | state->private = 0; |
f510cfec CM |
152 | |
153 | spin_lock_irqsave(&state_lock, flags); | |
154 | list_add(&state->list, &states); | |
155 | spin_unlock_irqrestore(&state_lock, flags); | |
156 | ||
a52d9a80 CM |
157 | atomic_set(&state->refs, 1); |
158 | init_waitqueue_head(&state->wq); | |
a52d9a80 CM |
159 | return state; |
160 | } | |
161 | EXPORT_SYMBOL(alloc_extent_state); | |
162 | ||
163 | void free_extent_state(struct extent_state *state) | |
164 | { | |
f510cfec | 165 | unsigned long flags; |
2bf5a725 CM |
166 | if (!state) |
167 | return; | |
a52d9a80 CM |
168 | if (atomic_dec_and_test(&state->refs)) { |
169 | WARN_ON(state->in_tree); | |
f510cfec CM |
170 | spin_lock_irqsave(&state_lock, flags); |
171 | list_del(&state->list); | |
172 | spin_unlock_irqrestore(&state_lock, flags); | |
a52d9a80 CM |
173 | kmem_cache_free(extent_state_cache, state); |
174 | } | |
175 | } | |
176 | EXPORT_SYMBOL(free_extent_state); | |
177 | ||
178 | static struct rb_node *tree_insert(struct rb_root *root, u64 offset, | |
179 | struct rb_node *node) | |
180 | { | |
181 | struct rb_node ** p = &root->rb_node; | |
182 | struct rb_node * parent = NULL; | |
183 | struct tree_entry *entry; | |
184 | ||
185 | while(*p) { | |
186 | parent = *p; | |
187 | entry = rb_entry(parent, struct tree_entry, rb_node); | |
188 | ||
189 | if (offset < entry->start) | |
190 | p = &(*p)->rb_left; | |
191 | else if (offset > entry->end) | |
192 | p = &(*p)->rb_right; | |
193 | else | |
194 | return parent; | |
195 | } | |
196 | ||
197 | entry = rb_entry(node, struct tree_entry, rb_node); | |
198 | entry->in_tree = 1; | |
199 | rb_link_node(node, parent, p); | |
200 | rb_insert_color(node, root); | |
201 | return NULL; | |
202 | } | |
203 | ||
204 | static struct rb_node *__tree_search(struct rb_root *root, u64 offset, | |
205 | struct rb_node **prev_ret) | |
206 | { | |
207 | struct rb_node * n = root->rb_node; | |
208 | struct rb_node *prev = NULL; | |
209 | struct tree_entry *entry; | |
210 | struct tree_entry *prev_entry = NULL; | |
211 | ||
212 | while(n) { | |
213 | entry = rb_entry(n, struct tree_entry, rb_node); | |
214 | prev = n; | |
215 | prev_entry = entry; | |
216 | ||
217 | if (offset < entry->start) | |
218 | n = n->rb_left; | |
219 | else if (offset > entry->end) | |
220 | n = n->rb_right; | |
221 | else | |
222 | return n; | |
223 | } | |
224 | if (!prev_ret) | |
225 | return NULL; | |
226 | while(prev && offset > prev_entry->end) { | |
227 | prev = rb_next(prev); | |
228 | prev_entry = rb_entry(prev, struct tree_entry, rb_node); | |
229 | } | |
230 | *prev_ret = prev; | |
231 | return NULL; | |
232 | } | |
233 | ||
234 | static inline struct rb_node *tree_search(struct rb_root *root, u64 offset) | |
235 | { | |
236 | struct rb_node *prev; | |
237 | struct rb_node *ret; | |
238 | ret = __tree_search(root, offset, &prev); | |
239 | if (!ret) | |
240 | return prev; | |
241 | return ret; | |
242 | } | |
243 | ||
244 | static int tree_delete(struct rb_root *root, u64 offset) | |
245 | { | |
246 | struct rb_node *node; | |
247 | struct tree_entry *entry; | |
248 | ||
249 | node = __tree_search(root, offset, NULL); | |
250 | if (!node) | |
251 | return -ENOENT; | |
252 | entry = rb_entry(node, struct tree_entry, rb_node); | |
253 | entry->in_tree = 0; | |
254 | rb_erase(node, root); | |
255 | return 0; | |
256 | } | |
257 | ||
258 | /* | |
259 | * add_extent_mapping tries a simple backward merge with existing | |
260 | * mappings. The extent_map struct passed in will be inserted into | |
261 | * the tree directly (no copies made, just a reference taken). | |
262 | */ | |
263 | int add_extent_mapping(struct extent_map_tree *tree, | |
264 | struct extent_map *em) | |
265 | { | |
266 | int ret = 0; | |
267 | struct extent_map *prev = NULL; | |
268 | struct rb_node *rb; | |
269 | ||
270 | write_lock_irq(&tree->lock); | |
271 | rb = tree_insert(&tree->map, em->end, &em->rb_node); | |
272 | if (rb) { | |
273 | prev = rb_entry(rb, struct extent_map, rb_node); | |
274 | printk("found extent map %Lu %Lu on insert of %Lu %Lu\n", prev->start, prev->end, em->start, em->end); | |
275 | ret = -EEXIST; | |
276 | goto out; | |
277 | } | |
278 | atomic_inc(&em->refs); | |
279 | if (em->start != 0) { | |
280 | rb = rb_prev(&em->rb_node); | |
281 | if (rb) | |
282 | prev = rb_entry(rb, struct extent_map, rb_node); | |
283 | if (prev && prev->end + 1 == em->start && | |
5f39d397 CM |
284 | ((em->block_start == EXTENT_MAP_HOLE && |
285 | prev->block_start == EXTENT_MAP_HOLE) || | |
179e29e4 CM |
286 | (em->block_start == EXTENT_MAP_INLINE && |
287 | prev->block_start == EXTENT_MAP_INLINE) || | |
288 | (em->block_start == EXTENT_MAP_DELALLOC && | |
289 | prev->block_start == EXTENT_MAP_DELALLOC) || | |
290 | (em->block_start < EXTENT_MAP_DELALLOC - 1 && | |
291 | em->block_start == prev->block_end + 1))) { | |
a52d9a80 CM |
292 | em->start = prev->start; |
293 | em->block_start = prev->block_start; | |
294 | rb_erase(&prev->rb_node, &tree->map); | |
295 | prev->in_tree = 0; | |
296 | free_extent_map(prev); | |
297 | } | |
298 | } | |
299 | out: | |
300 | write_unlock_irq(&tree->lock); | |
301 | return ret; | |
302 | } | |
303 | EXPORT_SYMBOL(add_extent_mapping); | |
304 | ||
305 | /* | |
306 | * lookup_extent_mapping returns the first extent_map struct in the | |
307 | * tree that intersects the [start, end] (inclusive) range. There may | |
308 | * be additional objects in the tree that intersect, so check the object | |
309 | * returned carefully to make sure you don't need additional lookups. | |
310 | */ | |
311 | struct extent_map *lookup_extent_mapping(struct extent_map_tree *tree, | |
312 | u64 start, u64 end) | |
313 | { | |
314 | struct extent_map *em; | |
315 | struct rb_node *rb_node; | |
316 | ||
317 | read_lock_irq(&tree->lock); | |
318 | rb_node = tree_search(&tree->map, start); | |
319 | if (!rb_node) { | |
320 | em = NULL; | |
321 | goto out; | |
322 | } | |
323 | if (IS_ERR(rb_node)) { | |
324 | em = ERR_PTR(PTR_ERR(rb_node)); | |
325 | goto out; | |
326 | } | |
327 | em = rb_entry(rb_node, struct extent_map, rb_node); | |
328 | if (em->end < start || em->start > end) { | |
329 | em = NULL; | |
330 | goto out; | |
331 | } | |
332 | atomic_inc(&em->refs); | |
333 | out: | |
334 | read_unlock_irq(&tree->lock); | |
335 | return em; | |
336 | } | |
337 | EXPORT_SYMBOL(lookup_extent_mapping); | |
338 | ||
339 | /* | |
340 | * removes an extent_map struct from the tree. No reference counts are | |
341 | * dropped, and no checks are done to see if the range is in use | |
342 | */ | |
343 | int remove_extent_mapping(struct extent_map_tree *tree, struct extent_map *em) | |
344 | { | |
345 | int ret; | |
346 | ||
347 | write_lock_irq(&tree->lock); | |
348 | ret = tree_delete(&tree->map, em->end); | |
349 | write_unlock_irq(&tree->lock); | |
350 | return ret; | |
351 | } | |
352 | EXPORT_SYMBOL(remove_extent_mapping); | |
353 | ||
354 | /* | |
355 | * utility function to look for merge candidates inside a given range. | |
356 | * Any extents with matching state are merged together into a single | |
357 | * extent in the tree. Extents with EXTENT_IO in their state field | |
358 | * are not merged because the end_io handlers need to be able to do | |
359 | * operations on them without sleeping (or doing allocations/splits). | |
360 | * | |
361 | * This should be called with the tree lock held. | |
362 | */ | |
363 | static int merge_state(struct extent_map_tree *tree, | |
364 | struct extent_state *state) | |
365 | { | |
366 | struct extent_state *other; | |
367 | struct rb_node *other_node; | |
368 | ||
369 | if (state->state & EXTENT_IOBITS) | |
370 | return 0; | |
371 | ||
372 | other_node = rb_prev(&state->rb_node); | |
373 | if (other_node) { | |
374 | other = rb_entry(other_node, struct extent_state, rb_node); | |
375 | if (other->end == state->start - 1 && | |
376 | other->state == state->state) { | |
377 | state->start = other->start; | |
378 | other->in_tree = 0; | |
379 | rb_erase(&other->rb_node, &tree->state); | |
380 | free_extent_state(other); | |
381 | } | |
382 | } | |
383 | other_node = rb_next(&state->rb_node); | |
384 | if (other_node) { | |
385 | other = rb_entry(other_node, struct extent_state, rb_node); | |
386 | if (other->start == state->end + 1 && | |
387 | other->state == state->state) { | |
388 | other->start = state->start; | |
389 | state->in_tree = 0; | |
390 | rb_erase(&state->rb_node, &tree->state); | |
391 | free_extent_state(state); | |
392 | } | |
393 | } | |
394 | return 0; | |
395 | } | |
396 | ||
397 | /* | |
398 | * insert an extent_state struct into the tree. 'bits' are set on the | |
399 | * struct before it is inserted. | |
400 | * | |
401 | * This may return -EEXIST if the extent is already there, in which case the | |
402 | * state struct is freed. | |
403 | * | |
404 | * The tree lock is not taken internally. This is a utility function and | |
405 | * probably isn't what you want to call (see set/clear_extent_bit). | |
406 | */ | |
407 | static int insert_state(struct extent_map_tree *tree, | |
408 | struct extent_state *state, u64 start, u64 end, | |
409 | int bits) | |
410 | { | |
411 | struct rb_node *node; | |
412 | ||
413 | if (end < start) { | |
414 | printk("end < start %Lu %Lu\n", end, start); | |
415 | WARN_ON(1); | |
416 | } | |
417 | state->state |= bits; | |
418 | state->start = start; | |
419 | state->end = end; | |
a52d9a80 CM |
420 | node = tree_insert(&tree->state, end, &state->rb_node); |
421 | if (node) { | |
422 | struct extent_state *found; | |
423 | found = rb_entry(node, struct extent_state, rb_node); | |
b888db2b | 424 | printk("found node %Lu %Lu on insert of %Lu %Lu\n", found->start, found->end, start, end); |
a52d9a80 CM |
425 | free_extent_state(state); |
426 | return -EEXIST; | |
427 | } | |
428 | merge_state(tree, state); | |
429 | return 0; | |
430 | } | |
431 | ||
432 | /* | |
433 | * split a given extent state struct in two, inserting the preallocated | |
434 | * struct 'prealloc' as the newly created second half. 'split' indicates an | |
435 | * offset inside 'orig' where it should be split. | |
436 | * | |
437 | * Before calling, | |
438 | * the tree has 'orig' at [orig->start, orig->end]. After calling, there | |
439 | * are two extent state structs in the tree: | |
440 | * prealloc: [orig->start, split - 1] | |
441 | * orig: [ split, orig->end ] | |
442 | * | |
443 | * The tree locks are not taken by this function. They need to be held | |
444 | * by the caller. | |
445 | */ | |
446 | static int split_state(struct extent_map_tree *tree, struct extent_state *orig, | |
447 | struct extent_state *prealloc, u64 split) | |
448 | { | |
449 | struct rb_node *node; | |
450 | prealloc->start = orig->start; | |
451 | prealloc->end = split - 1; | |
452 | prealloc->state = orig->state; | |
453 | orig->start = split; | |
f510cfec | 454 | |
a52d9a80 CM |
455 | node = tree_insert(&tree->state, prealloc->end, &prealloc->rb_node); |
456 | if (node) { | |
457 | struct extent_state *found; | |
458 | found = rb_entry(node, struct extent_state, rb_node); | |
b888db2b | 459 | printk("found node %Lu %Lu on insert of %Lu %Lu\n", found->start, found->end, prealloc->start, prealloc->end); |
a52d9a80 CM |
460 | free_extent_state(prealloc); |
461 | return -EEXIST; | |
462 | } | |
463 | return 0; | |
464 | } | |
465 | ||
466 | /* | |
467 | * utility function to clear some bits in an extent state struct. | |
468 | * it will optionally wake up any one waiting on this state (wake == 1), or | |
469 | * forcibly remove the state from the tree (delete == 1). | |
470 | * | |
471 | * If no bits are set on the state struct after clearing things, the | |
472 | * struct is freed and removed from the tree | |
473 | */ | |
474 | static int clear_state_bit(struct extent_map_tree *tree, | |
475 | struct extent_state *state, int bits, int wake, | |
476 | int delete) | |
477 | { | |
478 | int ret = state->state & bits; | |
479 | state->state &= ~bits; | |
480 | if (wake) | |
481 | wake_up(&state->wq); | |
482 | if (delete || state->state == 0) { | |
483 | if (state->in_tree) { | |
484 | rb_erase(&state->rb_node, &tree->state); | |
485 | state->in_tree = 0; | |
486 | free_extent_state(state); | |
487 | } else { | |
488 | WARN_ON(1); | |
489 | } | |
490 | } else { | |
491 | merge_state(tree, state); | |
492 | } | |
493 | return ret; | |
494 | } | |
495 | ||
496 | /* | |
497 | * clear some bits on a range in the tree. This may require splitting | |
498 | * or inserting elements in the tree, so the gfp mask is used to | |
499 | * indicate which allocations or sleeping are allowed. | |
500 | * | |
501 | * pass 'wake' == 1 to kick any sleepers, and 'delete' == 1 to remove | |
502 | * the given range from the tree regardless of state (ie for truncate). | |
503 | * | |
504 | * the range [start, end] is inclusive. | |
505 | * | |
506 | * This takes the tree lock, and returns < 0 on error, > 0 if any of the | |
507 | * bits were already set, or zero if none of the bits were already set. | |
508 | */ | |
509 | int clear_extent_bit(struct extent_map_tree *tree, u64 start, u64 end, | |
510 | int bits, int wake, int delete, gfp_t mask) | |
511 | { | |
512 | struct extent_state *state; | |
513 | struct extent_state *prealloc = NULL; | |
514 | struct rb_node *node; | |
90f1c19a | 515 | unsigned long flags; |
a52d9a80 CM |
516 | int err; |
517 | int set = 0; | |
518 | ||
519 | again: | |
520 | if (!prealloc && (mask & __GFP_WAIT)) { | |
521 | prealloc = alloc_extent_state(mask); | |
522 | if (!prealloc) | |
523 | return -ENOMEM; | |
524 | } | |
525 | ||
90f1c19a | 526 | write_lock_irqsave(&tree->lock, flags); |
a52d9a80 CM |
527 | /* |
528 | * this search will find the extents that end after | |
529 | * our range starts | |
530 | */ | |
531 | node = tree_search(&tree->state, start); | |
532 | if (!node) | |
533 | goto out; | |
534 | state = rb_entry(node, struct extent_state, rb_node); | |
535 | if (state->start > end) | |
536 | goto out; | |
537 | WARN_ON(state->end < start); | |
538 | ||
539 | /* | |
540 | * | ---- desired range ---- | | |
541 | * | state | or | |
542 | * | ------------- state -------------- | | |
543 | * | |
544 | * We need to split the extent we found, and may flip | |
545 | * bits on second half. | |
546 | * | |
547 | * If the extent we found extends past our range, we | |
548 | * just split and search again. It'll get split again | |
549 | * the next time though. | |
550 | * | |
551 | * If the extent we found is inside our range, we clear | |
552 | * the desired bit on it. | |
553 | */ | |
554 | ||
555 | if (state->start < start) { | |
556 | err = split_state(tree, state, prealloc, start); | |
557 | BUG_ON(err == -EEXIST); | |
558 | prealloc = NULL; | |
559 | if (err) | |
560 | goto out; | |
561 | if (state->end <= end) { | |
562 | start = state->end + 1; | |
563 | set |= clear_state_bit(tree, state, bits, | |
564 | wake, delete); | |
565 | } else { | |
566 | start = state->start; | |
567 | } | |
568 | goto search_again; | |
569 | } | |
570 | /* | |
571 | * | ---- desired range ---- | | |
572 | * | state | | |
573 | * We need to split the extent, and clear the bit | |
574 | * on the first half | |
575 | */ | |
576 | if (state->start <= end && state->end > end) { | |
577 | err = split_state(tree, state, prealloc, end + 1); | |
578 | BUG_ON(err == -EEXIST); | |
579 | ||
580 | if (wake) | |
581 | wake_up(&state->wq); | |
582 | set |= clear_state_bit(tree, prealloc, bits, | |
583 | wake, delete); | |
584 | prealloc = NULL; | |
585 | goto out; | |
586 | } | |
587 | ||
588 | start = state->end + 1; | |
589 | set |= clear_state_bit(tree, state, bits, wake, delete); | |
590 | goto search_again; | |
591 | ||
592 | out: | |
90f1c19a | 593 | write_unlock_irqrestore(&tree->lock, flags); |
a52d9a80 CM |
594 | if (prealloc) |
595 | free_extent_state(prealloc); | |
596 | ||
597 | return set; | |
598 | ||
599 | search_again: | |
96b5179d | 600 | if (start > end) |
a52d9a80 | 601 | goto out; |
90f1c19a | 602 | write_unlock_irqrestore(&tree->lock, flags); |
a52d9a80 CM |
603 | if (mask & __GFP_WAIT) |
604 | cond_resched(); | |
605 | goto again; | |
606 | } | |
607 | EXPORT_SYMBOL(clear_extent_bit); | |
608 | ||
609 | static int wait_on_state(struct extent_map_tree *tree, | |
610 | struct extent_state *state) | |
611 | { | |
612 | DEFINE_WAIT(wait); | |
613 | prepare_to_wait(&state->wq, &wait, TASK_UNINTERRUPTIBLE); | |
614 | read_unlock_irq(&tree->lock); | |
615 | schedule(); | |
616 | read_lock_irq(&tree->lock); | |
617 | finish_wait(&state->wq, &wait); | |
618 | return 0; | |
619 | } | |
620 | ||
621 | /* | |
622 | * waits for one or more bits to clear on a range in the state tree. | |
623 | * The range [start, end] is inclusive. | |
624 | * The tree lock is taken by this function | |
625 | */ | |
626 | int wait_extent_bit(struct extent_map_tree *tree, u64 start, u64 end, int bits) | |
627 | { | |
628 | struct extent_state *state; | |
629 | struct rb_node *node; | |
630 | ||
631 | read_lock_irq(&tree->lock); | |
632 | again: | |
633 | while (1) { | |
634 | /* | |
635 | * this search will find all the extents that end after | |
636 | * our range starts | |
637 | */ | |
638 | node = tree_search(&tree->state, start); | |
639 | if (!node) | |
640 | break; | |
641 | ||
642 | state = rb_entry(node, struct extent_state, rb_node); | |
643 | ||
644 | if (state->start > end) | |
645 | goto out; | |
646 | ||
647 | if (state->state & bits) { | |
648 | start = state->start; | |
649 | atomic_inc(&state->refs); | |
650 | wait_on_state(tree, state); | |
651 | free_extent_state(state); | |
652 | goto again; | |
653 | } | |
654 | start = state->end + 1; | |
655 | ||
656 | if (start > end) | |
657 | break; | |
658 | ||
659 | if (need_resched()) { | |
660 | read_unlock_irq(&tree->lock); | |
661 | cond_resched(); | |
662 | read_lock_irq(&tree->lock); | |
663 | } | |
664 | } | |
665 | out: | |
666 | read_unlock_irq(&tree->lock); | |
667 | return 0; | |
668 | } | |
669 | EXPORT_SYMBOL(wait_extent_bit); | |
670 | ||
671 | /* | |
672 | * set some bits on a range in the tree. This may require allocations | |
673 | * or sleeping, so the gfp mask is used to indicate what is allowed. | |
674 | * | |
675 | * If 'exclusive' == 1, this will fail with -EEXIST if some part of the | |
676 | * range already has the desired bits set. The start of the existing | |
677 | * range is returned in failed_start in this case. | |
678 | * | |
679 | * [start, end] is inclusive | |
680 | * This takes the tree lock. | |
681 | */ | |
682 | int set_extent_bit(struct extent_map_tree *tree, u64 start, u64 end, int bits, | |
683 | int exclusive, u64 *failed_start, gfp_t mask) | |
684 | { | |
685 | struct extent_state *state; | |
686 | struct extent_state *prealloc = NULL; | |
687 | struct rb_node *node; | |
90f1c19a | 688 | unsigned long flags; |
a52d9a80 CM |
689 | int err = 0; |
690 | int set; | |
691 | u64 last_start; | |
692 | u64 last_end; | |
693 | again: | |
694 | if (!prealloc && (mask & __GFP_WAIT)) { | |
695 | prealloc = alloc_extent_state(mask); | |
696 | if (!prealloc) | |
697 | return -ENOMEM; | |
698 | } | |
699 | ||
90f1c19a | 700 | write_lock_irqsave(&tree->lock, flags); |
a52d9a80 CM |
701 | /* |
702 | * this search will find all the extents that end after | |
703 | * our range starts. | |
704 | */ | |
705 | node = tree_search(&tree->state, start); | |
706 | if (!node) { | |
707 | err = insert_state(tree, prealloc, start, end, bits); | |
708 | prealloc = NULL; | |
709 | BUG_ON(err == -EEXIST); | |
710 | goto out; | |
711 | } | |
712 | ||
713 | state = rb_entry(node, struct extent_state, rb_node); | |
714 | last_start = state->start; | |
715 | last_end = state->end; | |
716 | ||
717 | /* | |
718 | * | ---- desired range ---- | | |
719 | * | state | | |
720 | * | |
721 | * Just lock what we found and keep going | |
722 | */ | |
723 | if (state->start == start && state->end <= end) { | |
724 | set = state->state & bits; | |
725 | if (set && exclusive) { | |
726 | *failed_start = state->start; | |
727 | err = -EEXIST; | |
728 | goto out; | |
729 | } | |
730 | state->state |= bits; | |
731 | start = state->end + 1; | |
732 | merge_state(tree, state); | |
733 | goto search_again; | |
734 | } | |
735 | ||
736 | /* | |
737 | * | ---- desired range ---- | | |
738 | * | state | | |
739 | * or | |
740 | * | ------------- state -------------- | | |
741 | * | |
742 | * We need to split the extent we found, and may flip bits on | |
743 | * second half. | |
744 | * | |
745 | * If the extent we found extends past our | |
746 | * range, we just split and search again. It'll get split | |
747 | * again the next time though. | |
748 | * | |
749 | * If the extent we found is inside our range, we set the | |
750 | * desired bit on it. | |
751 | */ | |
752 | if (state->start < start) { | |
753 | set = state->state & bits; | |
754 | if (exclusive && set) { | |
755 | *failed_start = start; | |
756 | err = -EEXIST; | |
757 | goto out; | |
758 | } | |
759 | err = split_state(tree, state, prealloc, start); | |
760 | BUG_ON(err == -EEXIST); | |
761 | prealloc = NULL; | |
762 | if (err) | |
763 | goto out; | |
764 | if (state->end <= end) { | |
765 | state->state |= bits; | |
766 | start = state->end + 1; | |
767 | merge_state(tree, state); | |
768 | } else { | |
769 | start = state->start; | |
770 | } | |
771 | goto search_again; | |
772 | } | |
a52d9a80 CM |
773 | /* |
774 | * | ---- desired range ---- | | |
775 | * | state | or | state | | |
776 | * | |
777 | * There's a hole, we need to insert something in it and | |
778 | * ignore the extent we found. | |
779 | */ | |
780 | if (state->start > start) { | |
781 | u64 this_end; | |
782 | if (end < last_start) | |
783 | this_end = end; | |
784 | else | |
785 | this_end = last_start -1; | |
786 | err = insert_state(tree, prealloc, start, this_end, | |
787 | bits); | |
788 | prealloc = NULL; | |
789 | BUG_ON(err == -EEXIST); | |
790 | if (err) | |
791 | goto out; | |
792 | start = this_end + 1; | |
793 | goto search_again; | |
794 | } | |
a8c450b2 CM |
795 | /* |
796 | * | ---- desired range ---- | | |
797 | * | state | | |
798 | * We need to split the extent, and set the bit | |
799 | * on the first half | |
800 | */ | |
801 | if (state->start <= end && state->end > end) { | |
802 | set = state->state & bits; | |
803 | if (exclusive && set) { | |
804 | *failed_start = start; | |
805 | err = -EEXIST; | |
806 | goto out; | |
807 | } | |
808 | err = split_state(tree, state, prealloc, end + 1); | |
809 | BUG_ON(err == -EEXIST); | |
810 | ||
811 | prealloc->state |= bits; | |
812 | merge_state(tree, prealloc); | |
813 | prealloc = NULL; | |
814 | goto out; | |
815 | } | |
816 | ||
a52d9a80 CM |
817 | goto search_again; |
818 | ||
819 | out: | |
90f1c19a | 820 | write_unlock_irqrestore(&tree->lock, flags); |
a52d9a80 CM |
821 | if (prealloc) |
822 | free_extent_state(prealloc); | |
823 | ||
824 | return err; | |
825 | ||
826 | search_again: | |
827 | if (start > end) | |
828 | goto out; | |
90f1c19a | 829 | write_unlock_irqrestore(&tree->lock, flags); |
a52d9a80 CM |
830 | if (mask & __GFP_WAIT) |
831 | cond_resched(); | |
832 | goto again; | |
833 | } | |
834 | EXPORT_SYMBOL(set_extent_bit); | |
835 | ||
836 | /* wrappers around set/clear extent bit */ | |
837 | int set_extent_dirty(struct extent_map_tree *tree, u64 start, u64 end, | |
838 | gfp_t mask) | |
839 | { | |
840 | return set_extent_bit(tree, start, end, EXTENT_DIRTY, 0, NULL, | |
841 | mask); | |
842 | } | |
843 | EXPORT_SYMBOL(set_extent_dirty); | |
844 | ||
96b5179d CM |
845 | int set_extent_bits(struct extent_map_tree *tree, u64 start, u64 end, |
846 | int bits, gfp_t mask) | |
847 | { | |
848 | return set_extent_bit(tree, start, end, bits, 0, NULL, | |
849 | mask); | |
850 | } | |
851 | EXPORT_SYMBOL(set_extent_bits); | |
852 | ||
853 | int clear_extent_bits(struct extent_map_tree *tree, u64 start, u64 end, | |
854 | int bits, gfp_t mask) | |
855 | { | |
856 | return clear_extent_bit(tree, start, end, bits, 0, 0, mask); | |
857 | } | |
858 | EXPORT_SYMBOL(clear_extent_bits); | |
859 | ||
b888db2b CM |
860 | int set_extent_delalloc(struct extent_map_tree *tree, u64 start, u64 end, |
861 | gfp_t mask) | |
862 | { | |
863 | return set_extent_bit(tree, start, end, | |
864 | EXTENT_DELALLOC | EXTENT_DIRTY, 0, NULL, | |
865 | mask); | |
866 | } | |
867 | EXPORT_SYMBOL(set_extent_delalloc); | |
868 | ||
a52d9a80 CM |
869 | int clear_extent_dirty(struct extent_map_tree *tree, u64 start, u64 end, |
870 | gfp_t mask) | |
871 | { | |
b888db2b CM |
872 | return clear_extent_bit(tree, start, end, |
873 | EXTENT_DIRTY | EXTENT_DELALLOC, 0, 0, mask); | |
a52d9a80 CM |
874 | } |
875 | EXPORT_SYMBOL(clear_extent_dirty); | |
876 | ||
877 | int set_extent_new(struct extent_map_tree *tree, u64 start, u64 end, | |
878 | gfp_t mask) | |
879 | { | |
880 | return set_extent_bit(tree, start, end, EXTENT_NEW, 0, NULL, | |
881 | mask); | |
882 | } | |
883 | EXPORT_SYMBOL(set_extent_new); | |
884 | ||
885 | int clear_extent_new(struct extent_map_tree *tree, u64 start, u64 end, | |
886 | gfp_t mask) | |
887 | { | |
888 | return clear_extent_bit(tree, start, end, EXTENT_NEW, 0, 0, mask); | |
889 | } | |
890 | EXPORT_SYMBOL(clear_extent_new); | |
891 | ||
892 | int set_extent_uptodate(struct extent_map_tree *tree, u64 start, u64 end, | |
893 | gfp_t mask) | |
894 | { | |
895 | return set_extent_bit(tree, start, end, EXTENT_UPTODATE, 0, NULL, | |
896 | mask); | |
897 | } | |
898 | EXPORT_SYMBOL(set_extent_uptodate); | |
899 | ||
900 | int clear_extent_uptodate(struct extent_map_tree *tree, u64 start, u64 end, | |
901 | gfp_t mask) | |
902 | { | |
903 | return clear_extent_bit(tree, start, end, EXTENT_UPTODATE, 0, 0, mask); | |
904 | } | |
905 | EXPORT_SYMBOL(clear_extent_uptodate); | |
906 | ||
907 | int set_extent_writeback(struct extent_map_tree *tree, u64 start, u64 end, | |
908 | gfp_t mask) | |
909 | { | |
910 | return set_extent_bit(tree, start, end, EXTENT_WRITEBACK, | |
911 | 0, NULL, mask); | |
912 | } | |
913 | EXPORT_SYMBOL(set_extent_writeback); | |
914 | ||
915 | int clear_extent_writeback(struct extent_map_tree *tree, u64 start, u64 end, | |
916 | gfp_t mask) | |
917 | { | |
918 | return clear_extent_bit(tree, start, end, EXTENT_WRITEBACK, 1, 0, mask); | |
919 | } | |
920 | EXPORT_SYMBOL(clear_extent_writeback); | |
921 | ||
922 | int wait_on_extent_writeback(struct extent_map_tree *tree, u64 start, u64 end) | |
923 | { | |
924 | return wait_extent_bit(tree, start, end, EXTENT_WRITEBACK); | |
925 | } | |
926 | EXPORT_SYMBOL(wait_on_extent_writeback); | |
927 | ||
928 | /* | |
929 | * locks a range in ascending order, waiting for any locked regions | |
930 | * it hits on the way. [start,end] are inclusive, and this will sleep. | |
931 | */ | |
932 | int lock_extent(struct extent_map_tree *tree, u64 start, u64 end, gfp_t mask) | |
933 | { | |
934 | int err; | |
935 | u64 failed_start; | |
936 | while (1) { | |
937 | err = set_extent_bit(tree, start, end, EXTENT_LOCKED, 1, | |
938 | &failed_start, mask); | |
939 | if (err == -EEXIST && (mask & __GFP_WAIT)) { | |
940 | wait_extent_bit(tree, failed_start, end, EXTENT_LOCKED); | |
941 | start = failed_start; | |
942 | } else { | |
943 | break; | |
944 | } | |
945 | WARN_ON(start > end); | |
946 | } | |
947 | return err; | |
948 | } | |
949 | EXPORT_SYMBOL(lock_extent); | |
950 | ||
951 | int unlock_extent(struct extent_map_tree *tree, u64 start, u64 end, | |
952 | gfp_t mask) | |
953 | { | |
954 | return clear_extent_bit(tree, start, end, EXTENT_LOCKED, 1, 0, mask); | |
955 | } | |
956 | EXPORT_SYMBOL(unlock_extent); | |
957 | ||
958 | /* | |
959 | * helper function to set pages and extents in the tree dirty | |
960 | */ | |
961 | int set_range_dirty(struct extent_map_tree *tree, u64 start, u64 end) | |
962 | { | |
963 | unsigned long index = start >> PAGE_CACHE_SHIFT; | |
964 | unsigned long end_index = end >> PAGE_CACHE_SHIFT; | |
965 | struct page *page; | |
966 | ||
967 | while (index <= end_index) { | |
968 | page = find_get_page(tree->mapping, index); | |
969 | BUG_ON(!page); | |
970 | __set_page_dirty_nobuffers(page); | |
971 | page_cache_release(page); | |
972 | index++; | |
973 | } | |
974 | set_extent_dirty(tree, start, end, GFP_NOFS); | |
975 | return 0; | |
976 | } | |
977 | EXPORT_SYMBOL(set_range_dirty); | |
978 | ||
979 | /* | |
980 | * helper function to set both pages and extents in the tree writeback | |
981 | */ | |
982 | int set_range_writeback(struct extent_map_tree *tree, u64 start, u64 end) | |
983 | { | |
984 | unsigned long index = start >> PAGE_CACHE_SHIFT; | |
985 | unsigned long end_index = end >> PAGE_CACHE_SHIFT; | |
986 | struct page *page; | |
987 | ||
988 | while (index <= end_index) { | |
989 | page = find_get_page(tree->mapping, index); | |
990 | BUG_ON(!page); | |
991 | set_page_writeback(page); | |
992 | page_cache_release(page); | |
993 | index++; | |
994 | } | |
995 | set_extent_writeback(tree, start, end, GFP_NOFS); | |
996 | return 0; | |
997 | } | |
998 | EXPORT_SYMBOL(set_range_writeback); | |
999 | ||
5f39d397 CM |
1000 | int find_first_extent_bit(struct extent_map_tree *tree, u64 start, |
1001 | u64 *start_ret, u64 *end_ret, int bits) | |
1002 | { | |
1003 | struct rb_node *node; | |
1004 | struct extent_state *state; | |
1005 | int ret = 1; | |
1006 | ||
e19caa5f | 1007 | read_lock_irq(&tree->lock); |
5f39d397 CM |
1008 | /* |
1009 | * this search will find all the extents that end after | |
1010 | * our range starts. | |
1011 | */ | |
1012 | node = tree_search(&tree->state, start); | |
1013 | if (!node || IS_ERR(node)) { | |
1014 | goto out; | |
1015 | } | |
1016 | ||
1017 | while(1) { | |
1018 | state = rb_entry(node, struct extent_state, rb_node); | |
e19caa5f | 1019 | if (state->end >= start && (state->state & bits)) { |
5f39d397 CM |
1020 | *start_ret = state->start; |
1021 | *end_ret = state->end; | |
1022 | ret = 0; | |
f510cfec | 1023 | break; |
5f39d397 CM |
1024 | } |
1025 | node = rb_next(node); | |
1026 | if (!node) | |
1027 | break; | |
1028 | } | |
1029 | out: | |
e19caa5f | 1030 | read_unlock_irq(&tree->lock); |
5f39d397 CM |
1031 | return ret; |
1032 | } | |
1033 | EXPORT_SYMBOL(find_first_extent_bit); | |
1034 | ||
b888db2b | 1035 | u64 find_lock_delalloc_range(struct extent_map_tree *tree, |
3e9fd94f | 1036 | u64 *start, u64 *end, u64 max_bytes) |
b888db2b CM |
1037 | { |
1038 | struct rb_node *node; | |
1039 | struct extent_state *state; | |
3e9fd94f | 1040 | u64 cur_start = *start; |
b888db2b CM |
1041 | u64 found = 0; |
1042 | u64 total_bytes = 0; | |
1043 | ||
1044 | write_lock_irq(&tree->lock); | |
1045 | /* | |
1046 | * this search will find all the extents that end after | |
1047 | * our range starts. | |
1048 | */ | |
1049 | search_again: | |
1050 | node = tree_search(&tree->state, cur_start); | |
1051 | if (!node || IS_ERR(node)) { | |
1052 | goto out; | |
1053 | } | |
1054 | ||
1055 | while(1) { | |
1056 | state = rb_entry(node, struct extent_state, rb_node); | |
3e9fd94f | 1057 | if (found && state->start != cur_start) { |
b888db2b CM |
1058 | goto out; |
1059 | } | |
1060 | if (!(state->state & EXTENT_DELALLOC)) { | |
1061 | goto out; | |
1062 | } | |
3e9fd94f CM |
1063 | if (!found) { |
1064 | struct extent_state *prev_state; | |
1065 | struct rb_node *prev_node = node; | |
1066 | while(1) { | |
1067 | prev_node = rb_prev(prev_node); | |
1068 | if (!prev_node) | |
1069 | break; | |
1070 | prev_state = rb_entry(prev_node, | |
1071 | struct extent_state, | |
1072 | rb_node); | |
1073 | if (!(prev_state->state & EXTENT_DELALLOC)) | |
1074 | break; | |
1075 | state = prev_state; | |
1076 | node = prev_node; | |
b888db2b | 1077 | } |
b888db2b | 1078 | } |
3e9fd94f CM |
1079 | if (state->state & EXTENT_LOCKED) { |
1080 | DEFINE_WAIT(wait); | |
1081 | atomic_inc(&state->refs); | |
1082 | prepare_to_wait(&state->wq, &wait, | |
1083 | TASK_UNINTERRUPTIBLE); | |
1084 | write_unlock_irq(&tree->lock); | |
1085 | schedule(); | |
1086 | write_lock_irq(&tree->lock); | |
1087 | finish_wait(&state->wq, &wait); | |
1088 | free_extent_state(state); | |
1089 | goto search_again; | |
1090 | } | |
1091 | state->state |= EXTENT_LOCKED; | |
1092 | if (!found) | |
1093 | *start = state->start; | |
b888db2b CM |
1094 | found++; |
1095 | *end = state->end; | |
1096 | cur_start = state->end + 1; | |
1097 | node = rb_next(node); | |
1098 | if (!node) | |
1099 | break; | |
944746ec | 1100 | total_bytes += state->end - state->start + 1; |
b888db2b CM |
1101 | if (total_bytes >= max_bytes) |
1102 | break; | |
1103 | } | |
1104 | out: | |
1105 | write_unlock_irq(&tree->lock); | |
1106 | return found; | |
1107 | } | |
1108 | ||
a52d9a80 CM |
1109 | /* |
1110 | * helper function to lock both pages and extents in the tree. | |
1111 | * pages must be locked first. | |
1112 | */ | |
1113 | int lock_range(struct extent_map_tree *tree, u64 start, u64 end) | |
1114 | { | |
1115 | unsigned long index = start >> PAGE_CACHE_SHIFT; | |
1116 | unsigned long end_index = end >> PAGE_CACHE_SHIFT; | |
1117 | struct page *page; | |
1118 | int err; | |
1119 | ||
1120 | while (index <= end_index) { | |
1121 | page = grab_cache_page(tree->mapping, index); | |
1122 | if (!page) { | |
1123 | err = -ENOMEM; | |
1124 | goto failed; | |
1125 | } | |
1126 | if (IS_ERR(page)) { | |
1127 | err = PTR_ERR(page); | |
1128 | goto failed; | |
1129 | } | |
1130 | index++; | |
1131 | } | |
1132 | lock_extent(tree, start, end, GFP_NOFS); | |
1133 | return 0; | |
1134 | ||
1135 | failed: | |
1136 | /* | |
1137 | * we failed above in getting the page at 'index', so we undo here | |
1138 | * up to but not including the page at 'index' | |
1139 | */ | |
1140 | end_index = index; | |
1141 | index = start >> PAGE_CACHE_SHIFT; | |
1142 | while (index < end_index) { | |
1143 | page = find_get_page(tree->mapping, index); | |
1144 | unlock_page(page); | |
1145 | page_cache_release(page); | |
1146 | index++; | |
1147 | } | |
1148 | return err; | |
1149 | } | |
1150 | EXPORT_SYMBOL(lock_range); | |
1151 | ||
1152 | /* | |
1153 | * helper function to unlock both pages and extents in the tree. | |
1154 | */ | |
1155 | int unlock_range(struct extent_map_tree *tree, u64 start, u64 end) | |
1156 | { | |
1157 | unsigned long index = start >> PAGE_CACHE_SHIFT; | |
1158 | unsigned long end_index = end >> PAGE_CACHE_SHIFT; | |
1159 | struct page *page; | |
1160 | ||
1161 | while (index <= end_index) { | |
1162 | page = find_get_page(tree->mapping, index); | |
1163 | unlock_page(page); | |
1164 | page_cache_release(page); | |
1165 | index++; | |
1166 | } | |
1167 | unlock_extent(tree, start, end, GFP_NOFS); | |
1168 | return 0; | |
1169 | } | |
1170 | EXPORT_SYMBOL(unlock_range); | |
1171 | ||
07157aac CM |
1172 | int set_state_private(struct extent_map_tree *tree, u64 start, u64 private) |
1173 | { | |
1174 | struct rb_node *node; | |
1175 | struct extent_state *state; | |
1176 | int ret = 0; | |
1177 | ||
1178 | write_lock_irq(&tree->lock); | |
1179 | /* | |
1180 | * this search will find all the extents that end after | |
1181 | * our range starts. | |
1182 | */ | |
1183 | node = tree_search(&tree->state, start); | |
1184 | if (!node || IS_ERR(node)) { | |
1185 | ret = -ENOENT; | |
1186 | goto out; | |
1187 | } | |
1188 | state = rb_entry(node, struct extent_state, rb_node); | |
1189 | if (state->start != start) { | |
1190 | ret = -ENOENT; | |
1191 | goto out; | |
1192 | } | |
1193 | state->private = private; | |
1194 | out: | |
1195 | write_unlock_irq(&tree->lock); | |
1196 | return ret; | |
07157aac CM |
1197 | } |
1198 | ||
1199 | int get_state_private(struct extent_map_tree *tree, u64 start, u64 *private) | |
1200 | { | |
1201 | struct rb_node *node; | |
1202 | struct extent_state *state; | |
1203 | int ret = 0; | |
1204 | ||
1205 | read_lock_irq(&tree->lock); | |
1206 | /* | |
1207 | * this search will find all the extents that end after | |
1208 | * our range starts. | |
1209 | */ | |
1210 | node = tree_search(&tree->state, start); | |
1211 | if (!node || IS_ERR(node)) { | |
1212 | ret = -ENOENT; | |
1213 | goto out; | |
1214 | } | |
1215 | state = rb_entry(node, struct extent_state, rb_node); | |
1216 | if (state->start != start) { | |
1217 | ret = -ENOENT; | |
1218 | goto out; | |
1219 | } | |
1220 | *private = state->private; | |
1221 | out: | |
1222 | read_unlock_irq(&tree->lock); | |
1223 | return ret; | |
1224 | } | |
1225 | ||
a52d9a80 CM |
1226 | /* |
1227 | * searches a range in the state tree for a given mask. | |
1228 | * If 'filled' == 1, this returns 1 only if ever extent in the tree | |
1229 | * has the bits set. Otherwise, 1 is returned if any bit in the | |
1230 | * range is found set. | |
1231 | */ | |
1a5bc167 CM |
1232 | int test_range_bit(struct extent_map_tree *tree, u64 start, u64 end, |
1233 | int bits, int filled) | |
a52d9a80 CM |
1234 | { |
1235 | struct extent_state *state = NULL; | |
1236 | struct rb_node *node; | |
1237 | int bitset = 0; | |
1238 | ||
1239 | read_lock_irq(&tree->lock); | |
1240 | node = tree_search(&tree->state, start); | |
1241 | while (node && start <= end) { | |
1242 | state = rb_entry(node, struct extent_state, rb_node); | |
a52d9a80 CM |
1243 | |
1244 | if (filled && state->start > start) { | |
1245 | bitset = 0; | |
1246 | break; | |
1247 | } | |
0591fb56 CM |
1248 | |
1249 | if (state->start > end) | |
1250 | break; | |
1251 | ||
a52d9a80 CM |
1252 | if (state->state & bits) { |
1253 | bitset = 1; | |
1254 | if (!filled) | |
1255 | break; | |
1256 | } else if (filled) { | |
1257 | bitset = 0; | |
1258 | break; | |
1259 | } | |
1260 | start = state->end + 1; | |
1261 | if (start > end) | |
1262 | break; | |
1263 | node = rb_next(node); | |
1264 | } | |
1265 | read_unlock_irq(&tree->lock); | |
1266 | return bitset; | |
1267 | } | |
1a5bc167 | 1268 | EXPORT_SYMBOL(test_range_bit); |
a52d9a80 CM |
1269 | |
1270 | /* | |
1271 | * helper function to set a given page up to date if all the | |
1272 | * extents in the tree for that page are up to date | |
1273 | */ | |
1274 | static int check_page_uptodate(struct extent_map_tree *tree, | |
1275 | struct page *page) | |
1276 | { | |
35ebb934 | 1277 | u64 start = (u64)page->index << PAGE_CACHE_SHIFT; |
a52d9a80 CM |
1278 | u64 end = start + PAGE_CACHE_SIZE - 1; |
1279 | if (test_range_bit(tree, start, end, EXTENT_UPTODATE, 1)) | |
1280 | SetPageUptodate(page); | |
1281 | return 0; | |
1282 | } | |
1283 | ||
1284 | /* | |
1285 | * helper function to unlock a page if all the extents in the tree | |
1286 | * for that page are unlocked | |
1287 | */ | |
1288 | static int check_page_locked(struct extent_map_tree *tree, | |
1289 | struct page *page) | |
1290 | { | |
35ebb934 | 1291 | u64 start = (u64)page->index << PAGE_CACHE_SHIFT; |
a52d9a80 CM |
1292 | u64 end = start + PAGE_CACHE_SIZE - 1; |
1293 | if (!test_range_bit(tree, start, end, EXTENT_LOCKED, 0)) | |
1294 | unlock_page(page); | |
1295 | return 0; | |
1296 | } | |
1297 | ||
1298 | /* | |
1299 | * helper function to end page writeback if all the extents | |
1300 | * in the tree for that page are done with writeback | |
1301 | */ | |
1302 | static int check_page_writeback(struct extent_map_tree *tree, | |
1303 | struct page *page) | |
1304 | { | |
35ebb934 | 1305 | u64 start = (u64)page->index << PAGE_CACHE_SHIFT; |
a52d9a80 CM |
1306 | u64 end = start + PAGE_CACHE_SIZE - 1; |
1307 | if (!test_range_bit(tree, start, end, EXTENT_WRITEBACK, 0)) | |
1308 | end_page_writeback(page); | |
1309 | return 0; | |
1310 | } | |
1311 | ||
1312 | /* lots and lots of room for performance fixes in the end_bio funcs */ | |
1313 | ||
1314 | /* | |
1315 | * after a writepage IO is done, we need to: | |
1316 | * clear the uptodate bits on error | |
1317 | * clear the writeback bits in the extent tree for this IO | |
1318 | * end_page_writeback if the page has no more pending IO | |
1319 | * | |
1320 | * Scheduling is not allowed, so the extent state tree is expected | |
1321 | * to have one and only one object corresponding to this IO. | |
1322 | */ | |
0a2118df JA |
1323 | #if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,23) |
1324 | static void end_bio_extent_writepage(struct bio *bio, int err) | |
1325 | #else | |
a52d9a80 CM |
1326 | static int end_bio_extent_writepage(struct bio *bio, |
1327 | unsigned int bytes_done, int err) | |
0a2118df | 1328 | #endif |
a52d9a80 CM |
1329 | { |
1330 | const int uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags); | |
1331 | struct bio_vec *bvec = bio->bi_io_vec + bio->bi_vcnt - 1; | |
1332 | struct extent_map_tree *tree = bio->bi_private; | |
1333 | u64 start; | |
1334 | u64 end; | |
1335 | int whole_page; | |
1336 | ||
0a2118df | 1337 | #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,23) |
a52d9a80 CM |
1338 | if (bio->bi_size) |
1339 | return 1; | |
0a2118df | 1340 | #endif |
a52d9a80 CM |
1341 | |
1342 | do { | |
1343 | struct page *page = bvec->bv_page; | |
35ebb934 CM |
1344 | start = ((u64)page->index << PAGE_CACHE_SHIFT) + |
1345 | bvec->bv_offset; | |
a52d9a80 CM |
1346 | end = start + bvec->bv_len - 1; |
1347 | ||
1348 | if (bvec->bv_offset == 0 && bvec->bv_len == PAGE_CACHE_SIZE) | |
1349 | whole_page = 1; | |
1350 | else | |
1351 | whole_page = 0; | |
1352 | ||
1353 | if (--bvec >= bio->bi_io_vec) | |
1354 | prefetchw(&bvec->bv_page->flags); | |
1355 | ||
1356 | if (!uptodate) { | |
1357 | clear_extent_uptodate(tree, start, end, GFP_ATOMIC); | |
1358 | ClearPageUptodate(page); | |
1359 | SetPageError(page); | |
1360 | } | |
1361 | clear_extent_writeback(tree, start, end, GFP_ATOMIC); | |
1362 | ||
1363 | if (whole_page) | |
1364 | end_page_writeback(page); | |
1365 | else | |
1366 | check_page_writeback(tree, page); | |
0e2752a7 CH |
1367 | if (tree->ops && tree->ops->writepage_end_io_hook) |
1368 | tree->ops->writepage_end_io_hook(page, start, end); | |
a52d9a80 CM |
1369 | } while (bvec >= bio->bi_io_vec); |
1370 | ||
1371 | bio_put(bio); | |
0a2118df | 1372 | #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,23) |
a52d9a80 | 1373 | return 0; |
0a2118df | 1374 | #endif |
a52d9a80 CM |
1375 | } |
1376 | ||
1377 | /* | |
1378 | * after a readpage IO is done, we need to: | |
1379 | * clear the uptodate bits on error | |
1380 | * set the uptodate bits if things worked | |
1381 | * set the page up to date if all extents in the tree are uptodate | |
1382 | * clear the lock bit in the extent tree | |
1383 | * unlock the page if there are no other extents locked for it | |
1384 | * | |
1385 | * Scheduling is not allowed, so the extent state tree is expected | |
1386 | * to have one and only one object corresponding to this IO. | |
1387 | */ | |
0a2118df JA |
1388 | #if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,23) |
1389 | static void end_bio_extent_readpage(struct bio *bio, int err) | |
1390 | #else | |
a52d9a80 CM |
1391 | static int end_bio_extent_readpage(struct bio *bio, |
1392 | unsigned int bytes_done, int err) | |
0a2118df | 1393 | #endif |
a52d9a80 | 1394 | { |
07157aac | 1395 | int uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags); |
a52d9a80 CM |
1396 | struct bio_vec *bvec = bio->bi_io_vec + bio->bi_vcnt - 1; |
1397 | struct extent_map_tree *tree = bio->bi_private; | |
1398 | u64 start; | |
1399 | u64 end; | |
1400 | int whole_page; | |
07157aac | 1401 | int ret; |
a52d9a80 | 1402 | |
0a2118df | 1403 | #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,23) |
a52d9a80 CM |
1404 | if (bio->bi_size) |
1405 | return 1; | |
0a2118df | 1406 | #endif |
a52d9a80 CM |
1407 | |
1408 | do { | |
1409 | struct page *page = bvec->bv_page; | |
35ebb934 CM |
1410 | start = ((u64)page->index << PAGE_CACHE_SHIFT) + |
1411 | bvec->bv_offset; | |
a52d9a80 CM |
1412 | end = start + bvec->bv_len - 1; |
1413 | ||
1414 | if (bvec->bv_offset == 0 && bvec->bv_len == PAGE_CACHE_SIZE) | |
1415 | whole_page = 1; | |
1416 | else | |
1417 | whole_page = 0; | |
1418 | ||
1419 | if (--bvec >= bio->bi_io_vec) | |
1420 | prefetchw(&bvec->bv_page->flags); | |
1421 | ||
07157aac CM |
1422 | if (uptodate && tree->ops && tree->ops->readpage_end_io_hook) { |
1423 | ret = tree->ops->readpage_end_io_hook(page, start, end); | |
1424 | if (ret) | |
1425 | uptodate = 0; | |
1426 | } | |
a52d9a80 CM |
1427 | if (uptodate) { |
1428 | set_extent_uptodate(tree, start, end, GFP_ATOMIC); | |
1429 | if (whole_page) | |
1430 | SetPageUptodate(page); | |
1431 | else | |
1432 | check_page_uptodate(tree, page); | |
1433 | } else { | |
1434 | ClearPageUptodate(page); | |
1435 | SetPageError(page); | |
1436 | } | |
1437 | ||
1438 | unlock_extent(tree, start, end, GFP_ATOMIC); | |
1439 | ||
1440 | if (whole_page) | |
1441 | unlock_page(page); | |
1442 | else | |
1443 | check_page_locked(tree, page); | |
1444 | } while (bvec >= bio->bi_io_vec); | |
1445 | ||
1446 | bio_put(bio); | |
0a2118df | 1447 | #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,23) |
a52d9a80 | 1448 | return 0; |
0a2118df | 1449 | #endif |
a52d9a80 CM |
1450 | } |
1451 | ||
1452 | /* | |
1453 | * IO done from prepare_write is pretty simple, we just unlock | |
1454 | * the structs in the extent tree when done, and set the uptodate bits | |
1455 | * as appropriate. | |
1456 | */ | |
0a2118df JA |
1457 | #if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,23) |
1458 | static void end_bio_extent_preparewrite(struct bio *bio, int err) | |
1459 | #else | |
a52d9a80 CM |
1460 | static int end_bio_extent_preparewrite(struct bio *bio, |
1461 | unsigned int bytes_done, int err) | |
0a2118df | 1462 | #endif |
a52d9a80 CM |
1463 | { |
1464 | const int uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags); | |
1465 | struct bio_vec *bvec = bio->bi_io_vec + bio->bi_vcnt - 1; | |
1466 | struct extent_map_tree *tree = bio->bi_private; | |
1467 | u64 start; | |
1468 | u64 end; | |
1469 | ||
0a2118df | 1470 | #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,23) |
a52d9a80 CM |
1471 | if (bio->bi_size) |
1472 | return 1; | |
0a2118df | 1473 | #endif |
a52d9a80 CM |
1474 | |
1475 | do { | |
1476 | struct page *page = bvec->bv_page; | |
35ebb934 CM |
1477 | start = ((u64)page->index << PAGE_CACHE_SHIFT) + |
1478 | bvec->bv_offset; | |
a52d9a80 CM |
1479 | end = start + bvec->bv_len - 1; |
1480 | ||
1481 | if (--bvec >= bio->bi_io_vec) | |
1482 | prefetchw(&bvec->bv_page->flags); | |
1483 | ||
1484 | if (uptodate) { | |
1485 | set_extent_uptodate(tree, start, end, GFP_ATOMIC); | |
1486 | } else { | |
1487 | ClearPageUptodate(page); | |
1488 | SetPageError(page); | |
1489 | } | |
1490 | ||
1491 | unlock_extent(tree, start, end, GFP_ATOMIC); | |
1492 | ||
1493 | } while (bvec >= bio->bi_io_vec); | |
1494 | ||
1495 | bio_put(bio); | |
0a2118df | 1496 | #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,23) |
a52d9a80 | 1497 | return 0; |
0a2118df | 1498 | #endif |
a52d9a80 CM |
1499 | } |
1500 | ||
b293f02e CM |
1501 | static struct bio * |
1502 | extent_bio_alloc(struct block_device *bdev, u64 first_sector, int nr_vecs, | |
1503 | gfp_t gfp_flags) | |
a52d9a80 CM |
1504 | { |
1505 | struct bio *bio; | |
a52d9a80 | 1506 | |
b293f02e | 1507 | bio = bio_alloc(gfp_flags, nr_vecs); |
a52d9a80 | 1508 | |
b293f02e CM |
1509 | if (bio == NULL && (current->flags & PF_MEMALLOC)) { |
1510 | while (!bio && (nr_vecs /= 2)) | |
1511 | bio = bio_alloc(gfp_flags, nr_vecs); | |
1512 | } | |
a52d9a80 | 1513 | |
b293f02e CM |
1514 | if (bio) { |
1515 | bio->bi_bdev = bdev; | |
1516 | bio->bi_sector = first_sector; | |
1517 | } | |
1518 | return bio; | |
1519 | } | |
a52d9a80 | 1520 | |
b293f02e CM |
1521 | static int submit_one_bio(int rw, struct bio *bio) |
1522 | { | |
1523 | int ret = 0; | |
a52d9a80 CM |
1524 | bio_get(bio); |
1525 | submit_bio(rw, bio); | |
a52d9a80 CM |
1526 | if (bio_flagged(bio, BIO_EOPNOTSUPP)) |
1527 | ret = -EOPNOTSUPP; | |
a52d9a80 CM |
1528 | bio_put(bio); |
1529 | return ret; | |
1530 | } | |
1531 | ||
b293f02e CM |
1532 | static int submit_extent_page(int rw, struct extent_map_tree *tree, |
1533 | struct page *page, sector_t sector, | |
1534 | size_t size, unsigned long offset, | |
1535 | struct block_device *bdev, | |
1536 | struct bio **bio_ret, | |
3ab2fb5a | 1537 | unsigned long max_pages, |
b293f02e CM |
1538 | bio_end_io_t end_io_func) |
1539 | { | |
1540 | int ret = 0; | |
1541 | struct bio *bio; | |
1542 | int nr; | |
1543 | ||
1544 | if (bio_ret && *bio_ret) { | |
1545 | bio = *bio_ret; | |
1546 | if (bio->bi_sector + (bio->bi_size >> 9) != sector || | |
1547 | bio_add_page(bio, page, size, offset) < size) { | |
1548 | ret = submit_one_bio(rw, bio); | |
1549 | bio = NULL; | |
1550 | } else { | |
1551 | return 0; | |
1552 | } | |
1553 | } | |
3ab2fb5a | 1554 | nr = min_t(int, max_pages, bio_get_nr_vecs(bdev)); |
b293f02e CM |
1555 | bio = extent_bio_alloc(bdev, sector, nr, GFP_NOFS | __GFP_HIGH); |
1556 | if (!bio) { | |
1557 | printk("failed to allocate bio nr %d\n", nr); | |
1558 | } | |
1559 | bio_add_page(bio, page, size, offset); | |
1560 | bio->bi_end_io = end_io_func; | |
1561 | bio->bi_private = tree; | |
1562 | if (bio_ret) { | |
1563 | *bio_ret = bio; | |
1564 | } else { | |
1565 | ret = submit_one_bio(rw, bio); | |
1566 | } | |
1567 | ||
1568 | return ret; | |
1569 | } | |
1570 | ||
b3cfa35a CH |
1571 | void set_page_extent_mapped(struct page *page) |
1572 | { | |
1573 | if (!PagePrivate(page)) { | |
1574 | SetPagePrivate(page); | |
1575 | WARN_ON(!page->mapping->a_ops->invalidatepage); | |
19c00ddc | 1576 | set_page_private(page, EXTENT_PAGE_PRIVATE); |
b3cfa35a CH |
1577 | page_cache_get(page); |
1578 | } | |
1579 | } | |
1580 | ||
a52d9a80 CM |
1581 | /* |
1582 | * basic readpage implementation. Locked extent state structs are inserted | |
1583 | * into the tree that are removed when the IO is done (by the end_io | |
1584 | * handlers) | |
1585 | */ | |
3ab2fb5a CM |
1586 | static int __extent_read_full_page(struct extent_map_tree *tree, |
1587 | struct page *page, | |
1588 | get_extent_t *get_extent, | |
1589 | struct bio **bio) | |
a52d9a80 CM |
1590 | { |
1591 | struct inode *inode = page->mapping->host; | |
35ebb934 | 1592 | u64 start = (u64)page->index << PAGE_CACHE_SHIFT; |
a52d9a80 CM |
1593 | u64 page_end = start + PAGE_CACHE_SIZE - 1; |
1594 | u64 end; | |
1595 | u64 cur = start; | |
1596 | u64 extent_offset; | |
1597 | u64 last_byte = i_size_read(inode); | |
1598 | u64 block_start; | |
1599 | u64 cur_end; | |
1600 | sector_t sector; | |
1601 | struct extent_map *em; | |
1602 | struct block_device *bdev; | |
1603 | int ret; | |
1604 | int nr = 0; | |
1605 | size_t page_offset = 0; | |
1606 | size_t iosize; | |
1607 | size_t blocksize = inode->i_sb->s_blocksize; | |
1608 | ||
b3cfa35a | 1609 | set_page_extent_mapped(page); |
a52d9a80 CM |
1610 | |
1611 | end = page_end; | |
1612 | lock_extent(tree, start, end, GFP_NOFS); | |
1613 | ||
1614 | while (cur <= end) { | |
1615 | if (cur >= last_byte) { | |
1616 | iosize = PAGE_CACHE_SIZE - page_offset; | |
1617 | zero_user_page(page, page_offset, iosize, KM_USER0); | |
1618 | set_extent_uptodate(tree, cur, cur + iosize - 1, | |
1619 | GFP_NOFS); | |
1620 | unlock_extent(tree, cur, cur + iosize - 1, GFP_NOFS); | |
1621 | break; | |
1622 | } | |
1623 | em = get_extent(inode, page, page_offset, cur, end, 0); | |
1624 | if (IS_ERR(em) || !em) { | |
1625 | SetPageError(page); | |
1626 | unlock_extent(tree, cur, end, GFP_NOFS); | |
1627 | break; | |
1628 | } | |
1629 | ||
1630 | extent_offset = cur - em->start; | |
1631 | BUG_ON(em->end < cur); | |
1632 | BUG_ON(end < cur); | |
1633 | ||
1634 | iosize = min(em->end - cur, end - cur) + 1; | |
1635 | cur_end = min(em->end, end); | |
1636 | iosize = (iosize + blocksize - 1) & ~((u64)blocksize - 1); | |
1637 | sector = (em->block_start + extent_offset) >> 9; | |
1638 | bdev = em->bdev; | |
1639 | block_start = em->block_start; | |
1640 | free_extent_map(em); | |
1641 | em = NULL; | |
1642 | ||
1643 | /* we've found a hole, just zero and go on */ | |
5f39d397 | 1644 | if (block_start == EXTENT_MAP_HOLE) { |
a52d9a80 CM |
1645 | zero_user_page(page, page_offset, iosize, KM_USER0); |
1646 | set_extent_uptodate(tree, cur, cur + iosize - 1, | |
1647 | GFP_NOFS); | |
1648 | unlock_extent(tree, cur, cur + iosize - 1, GFP_NOFS); | |
1649 | cur = cur + iosize; | |
1650 | page_offset += iosize; | |
1651 | continue; | |
1652 | } | |
1653 | /* the get_extent function already copied into the page */ | |
1654 | if (test_range_bit(tree, cur, cur_end, EXTENT_UPTODATE, 1)) { | |
1655 | unlock_extent(tree, cur, cur + iosize - 1, GFP_NOFS); | |
1656 | cur = cur + iosize; | |
1657 | page_offset += iosize; | |
1658 | continue; | |
1659 | } | |
1660 | ||
07157aac CM |
1661 | ret = 0; |
1662 | if (tree->ops && tree->ops->readpage_io_hook) { | |
1663 | ret = tree->ops->readpage_io_hook(page, cur, | |
1664 | cur + iosize - 1); | |
1665 | } | |
1666 | if (!ret) { | |
3ab2fb5a CM |
1667 | unsigned long nr = (last_byte >> PAGE_CACHE_SHIFT) + 1; |
1668 | nr -= page->index; | |
07157aac | 1669 | ret = submit_extent_page(READ, tree, page, |
3ab2fb5a CM |
1670 | sector, iosize, page_offset, |
1671 | bdev, bio, nr, | |
1672 | end_bio_extent_readpage); | |
07157aac | 1673 | } |
a52d9a80 CM |
1674 | if (ret) |
1675 | SetPageError(page); | |
1676 | cur = cur + iosize; | |
1677 | page_offset += iosize; | |
1678 | nr++; | |
1679 | } | |
1680 | if (!nr) { | |
1681 | if (!PageError(page)) | |
1682 | SetPageUptodate(page); | |
1683 | unlock_page(page); | |
1684 | } | |
1685 | return 0; | |
1686 | } | |
3ab2fb5a CM |
1687 | |
1688 | int extent_read_full_page(struct extent_map_tree *tree, struct page *page, | |
1689 | get_extent_t *get_extent) | |
1690 | { | |
1691 | struct bio *bio = NULL; | |
1692 | int ret; | |
1693 | ||
1694 | ret = __extent_read_full_page(tree, page, get_extent, &bio); | |
1695 | if (bio) | |
1696 | submit_one_bio(READ, bio); | |
1697 | return ret; | |
1698 | } | |
a52d9a80 CM |
1699 | EXPORT_SYMBOL(extent_read_full_page); |
1700 | ||
1701 | /* | |
1702 | * the writepage semantics are similar to regular writepage. extent | |
1703 | * records are inserted to lock ranges in the tree, and as dirty areas | |
1704 | * are found, they are marked writeback. Then the lock bits are removed | |
1705 | * and the end_io handler clears the writeback ranges | |
1706 | */ | |
b293f02e CM |
1707 | static int __extent_writepage(struct page *page, struct writeback_control *wbc, |
1708 | void *data) | |
a52d9a80 CM |
1709 | { |
1710 | struct inode *inode = page->mapping->host; | |
b293f02e CM |
1711 | struct extent_page_data *epd = data; |
1712 | struct extent_map_tree *tree = epd->tree; | |
35ebb934 | 1713 | u64 start = (u64)page->index << PAGE_CACHE_SHIFT; |
3e9fd94f | 1714 | u64 delalloc_start; |
a52d9a80 CM |
1715 | u64 page_end = start + PAGE_CACHE_SIZE - 1; |
1716 | u64 end; | |
1717 | u64 cur = start; | |
1718 | u64 extent_offset; | |
1719 | u64 last_byte = i_size_read(inode); | |
1720 | u64 block_start; | |
179e29e4 | 1721 | u64 iosize; |
a52d9a80 CM |
1722 | sector_t sector; |
1723 | struct extent_map *em; | |
1724 | struct block_device *bdev; | |
1725 | int ret; | |
1726 | int nr = 0; | |
1727 | size_t page_offset = 0; | |
a52d9a80 CM |
1728 | size_t blocksize; |
1729 | loff_t i_size = i_size_read(inode); | |
1730 | unsigned long end_index = i_size >> PAGE_CACHE_SHIFT; | |
b888db2b CM |
1731 | u64 nr_delalloc; |
1732 | u64 delalloc_end; | |
a52d9a80 | 1733 | |
b888db2b | 1734 | WARN_ON(!PageLocked(page)); |
a52d9a80 CM |
1735 | if (page->index > end_index) { |
1736 | clear_extent_dirty(tree, start, page_end, GFP_NOFS); | |
1737 | unlock_page(page); | |
1738 | return 0; | |
1739 | } | |
1740 | ||
1741 | if (page->index == end_index) { | |
1742 | size_t offset = i_size & (PAGE_CACHE_SIZE - 1); | |
1743 | zero_user_page(page, offset, | |
1744 | PAGE_CACHE_SIZE - offset, KM_USER0); | |
1745 | } | |
1746 | ||
b3cfa35a | 1747 | set_page_extent_mapped(page); |
a52d9a80 | 1748 | |
3e9fd94f CM |
1749 | delalloc_start = start; |
1750 | delalloc_end = 0; | |
1751 | while(delalloc_end < page_end) { | |
1752 | nr_delalloc = find_lock_delalloc_range(tree, &delalloc_start, | |
1753 | &delalloc_end, | |
1754 | 128 * 1024 * 1024); | |
1755 | if (nr_delalloc <= 0) | |
1756 | break; | |
1757 | tree->ops->fill_delalloc(inode, delalloc_start, | |
1758 | delalloc_end); | |
1759 | clear_extent_bit(tree, delalloc_start, | |
1760 | delalloc_end, | |
1761 | EXTENT_LOCKED | EXTENT_DELALLOC, | |
1762 | 1, 0, GFP_NOFS); | |
1763 | delalloc_start = delalloc_end + 1; | |
b888db2b | 1764 | } |
3e9fd94f | 1765 | lock_extent(tree, start, page_end, GFP_NOFS); |
b888db2b CM |
1766 | |
1767 | end = page_end; | |
1768 | if (test_range_bit(tree, start, page_end, EXTENT_DELALLOC, 0)) { | |
1769 | printk("found delalloc bits after lock_extent\n"); | |
1770 | } | |
a52d9a80 CM |
1771 | |
1772 | if (last_byte <= start) { | |
1773 | clear_extent_dirty(tree, start, page_end, GFP_NOFS); | |
1774 | goto done; | |
1775 | } | |
1776 | ||
1777 | set_extent_uptodate(tree, start, page_end, GFP_NOFS); | |
1778 | blocksize = inode->i_sb->s_blocksize; | |
1779 | ||
1780 | while (cur <= end) { | |
1781 | if (cur >= last_byte) { | |
1782 | clear_extent_dirty(tree, cur, page_end, GFP_NOFS); | |
1783 | break; | |
1784 | } | |
b293f02e | 1785 | em = epd->get_extent(inode, page, page_offset, cur, end, 1); |
a52d9a80 CM |
1786 | if (IS_ERR(em) || !em) { |
1787 | SetPageError(page); | |
1788 | break; | |
1789 | } | |
1790 | ||
1791 | extent_offset = cur - em->start; | |
1792 | BUG_ON(em->end < cur); | |
1793 | BUG_ON(end < cur); | |
1794 | iosize = min(em->end - cur, end - cur) + 1; | |
1795 | iosize = (iosize + blocksize - 1) & ~((u64)blocksize - 1); | |
1796 | sector = (em->block_start + extent_offset) >> 9; | |
1797 | bdev = em->bdev; | |
1798 | block_start = em->block_start; | |
1799 | free_extent_map(em); | |
1800 | em = NULL; | |
1801 | ||
5f39d397 CM |
1802 | if (block_start == EXTENT_MAP_HOLE || |
1803 | block_start == EXTENT_MAP_INLINE) { | |
a52d9a80 CM |
1804 | clear_extent_dirty(tree, cur, |
1805 | cur + iosize - 1, GFP_NOFS); | |
1806 | cur = cur + iosize; | |
1807 | page_offset += iosize; | |
1808 | continue; | |
1809 | } | |
1810 | ||
1811 | /* leave this out until we have a page_mkwrite call */ | |
1812 | if (0 && !test_range_bit(tree, cur, cur + iosize - 1, | |
1813 | EXTENT_DIRTY, 0)) { | |
1814 | cur = cur + iosize; | |
1815 | page_offset += iosize; | |
1816 | continue; | |
1817 | } | |
1818 | clear_extent_dirty(tree, cur, cur + iosize - 1, GFP_NOFS); | |
b06355f0 CH |
1819 | if (tree->ops && tree->ops->writepage_io_hook) { |
1820 | ret = tree->ops->writepage_io_hook(page, cur, | |
1821 | cur + iosize - 1); | |
1822 | } else { | |
1823 | ret = 0; | |
1824 | } | |
a52d9a80 CM |
1825 | if (ret) |
1826 | SetPageError(page); | |
07157aac | 1827 | else { |
7073c8e8 | 1828 | unsigned long max_nr = end_index + 1; |
07157aac | 1829 | set_range_writeback(tree, cur, cur + iosize - 1); |
7073c8e8 CM |
1830 | if (!PageWriteback(page)) { |
1831 | printk("warning page %lu not writeback, " | |
1832 | "cur %llu end %llu\n", page->index, | |
1833 | (unsigned long long)cur, | |
1834 | (unsigned long long)end); | |
1835 | } | |
b293f02e | 1836 | |
07157aac CM |
1837 | ret = submit_extent_page(WRITE, tree, page, sector, |
1838 | iosize, page_offset, bdev, | |
7073c8e8 | 1839 | &epd->bio, max_nr, |
07157aac CM |
1840 | end_bio_extent_writepage); |
1841 | if (ret) | |
1842 | SetPageError(page); | |
1843 | } | |
a52d9a80 CM |
1844 | cur = cur + iosize; |
1845 | page_offset += iosize; | |
1846 | nr++; | |
1847 | } | |
1848 | done: | |
7073c8e8 CM |
1849 | if (nr == 0) { |
1850 | /* make sure the mapping tag for page dirty gets cleared */ | |
1851 | set_page_writeback(page); | |
1852 | end_page_writeback(page); | |
1853 | } | |
a52d9a80 CM |
1854 | unlock_extent(tree, start, page_end, GFP_NOFS); |
1855 | unlock_page(page); | |
1856 | return 0; | |
1857 | } | |
b293f02e CM |
1858 | |
1859 | int extent_write_full_page(struct extent_map_tree *tree, struct page *page, | |
1860 | get_extent_t *get_extent, | |
1861 | struct writeback_control *wbc) | |
1862 | { | |
1863 | int ret; | |
1864 | struct extent_page_data epd = { | |
1865 | .bio = NULL, | |
1866 | .tree = tree, | |
1867 | .get_extent = get_extent, | |
1868 | }; | |
1869 | ||
1870 | ret = __extent_writepage(page, wbc, &epd); | |
1871 | if (epd.bio) | |
1872 | submit_one_bio(WRITE, epd.bio); | |
1873 | return ret; | |
1874 | } | |
a52d9a80 CM |
1875 | EXPORT_SYMBOL(extent_write_full_page); |
1876 | ||
b293f02e CM |
1877 | int extent_writepages(struct extent_map_tree *tree, |
1878 | struct address_space *mapping, | |
1879 | get_extent_t *get_extent, | |
1880 | struct writeback_control *wbc) | |
1881 | { | |
1882 | int ret; | |
1883 | struct extent_page_data epd = { | |
1884 | .bio = NULL, | |
1885 | .tree = tree, | |
1886 | .get_extent = get_extent, | |
1887 | }; | |
1888 | ||
1889 | ret = write_cache_pages(mapping, wbc, __extent_writepage, &epd); | |
1890 | if (epd.bio) | |
1891 | submit_one_bio(WRITE, epd.bio); | |
1892 | return ret; | |
1893 | } | |
1894 | EXPORT_SYMBOL(extent_writepages); | |
1895 | ||
3ab2fb5a CM |
1896 | int extent_readpages(struct extent_map_tree *tree, |
1897 | struct address_space *mapping, | |
1898 | struct list_head *pages, unsigned nr_pages, | |
1899 | get_extent_t get_extent) | |
1900 | { | |
1901 | struct bio *bio = NULL; | |
1902 | unsigned page_idx; | |
1903 | struct pagevec pvec; | |
1904 | ||
1905 | pagevec_init(&pvec, 0); | |
1906 | for (page_idx = 0; page_idx < nr_pages; page_idx++) { | |
1907 | struct page *page = list_entry(pages->prev, struct page, lru); | |
1908 | ||
1909 | prefetchw(&page->flags); | |
1910 | list_del(&page->lru); | |
1911 | /* | |
1912 | * what we want to do here is call add_to_page_cache_lru, | |
1913 | * but that isn't exported, so we reproduce it here | |
1914 | */ | |
1915 | if (!add_to_page_cache(page, mapping, | |
1916 | page->index, GFP_KERNEL)) { | |
1917 | ||
1918 | /* open coding of lru_cache_add, also not exported */ | |
1919 | page_cache_get(page); | |
1920 | if (!pagevec_add(&pvec, page)) | |
1921 | __pagevec_lru_add(&pvec); | |
1922 | __extent_read_full_page(tree, page, get_extent, &bio); | |
1923 | } | |
1924 | page_cache_release(page); | |
1925 | } | |
1926 | if (pagevec_count(&pvec)) | |
1927 | __pagevec_lru_add(&pvec); | |
1928 | BUG_ON(!list_empty(pages)); | |
1929 | if (bio) | |
1930 | submit_one_bio(READ, bio); | |
1931 | return 0; | |
1932 | } | |
1933 | EXPORT_SYMBOL(extent_readpages); | |
1934 | ||
a52d9a80 CM |
1935 | /* |
1936 | * basic invalidatepage code, this waits on any locked or writeback | |
1937 | * ranges corresponding to the page, and then deletes any extent state | |
1938 | * records from the tree | |
1939 | */ | |
1940 | int extent_invalidatepage(struct extent_map_tree *tree, | |
1941 | struct page *page, unsigned long offset) | |
1942 | { | |
35ebb934 | 1943 | u64 start = ((u64)page->index << PAGE_CACHE_SHIFT); |
a52d9a80 CM |
1944 | u64 end = start + PAGE_CACHE_SIZE - 1; |
1945 | size_t blocksize = page->mapping->host->i_sb->s_blocksize; | |
1946 | ||
1947 | start += (offset + blocksize -1) & ~(blocksize - 1); | |
1948 | if (start > end) | |
1949 | return 0; | |
1950 | ||
1951 | lock_extent(tree, start, end, GFP_NOFS); | |
1952 | wait_on_extent_writeback(tree, start, end); | |
2bf5a725 CM |
1953 | clear_extent_bit(tree, start, end, |
1954 | EXTENT_LOCKED | EXTENT_DIRTY | EXTENT_DELALLOC, | |
a52d9a80 CM |
1955 | 1, 1, GFP_NOFS); |
1956 | return 0; | |
1957 | } | |
1958 | EXPORT_SYMBOL(extent_invalidatepage); | |
1959 | ||
1960 | /* | |
1961 | * simple commit_write call, set_range_dirty is used to mark both | |
1962 | * the pages and the extent records as dirty | |
1963 | */ | |
1964 | int extent_commit_write(struct extent_map_tree *tree, | |
1965 | struct inode *inode, struct page *page, | |
1966 | unsigned from, unsigned to) | |
1967 | { | |
1968 | loff_t pos = ((loff_t)page->index << PAGE_CACHE_SHIFT) + to; | |
1969 | ||
b3cfa35a | 1970 | set_page_extent_mapped(page); |
a52d9a80 CM |
1971 | set_page_dirty(page); |
1972 | ||
1973 | if (pos > inode->i_size) { | |
1974 | i_size_write(inode, pos); | |
1975 | mark_inode_dirty(inode); | |
1976 | } | |
1977 | return 0; | |
1978 | } | |
1979 | EXPORT_SYMBOL(extent_commit_write); | |
1980 | ||
1981 | int extent_prepare_write(struct extent_map_tree *tree, | |
1982 | struct inode *inode, struct page *page, | |
1983 | unsigned from, unsigned to, get_extent_t *get_extent) | |
1984 | { | |
35ebb934 | 1985 | u64 page_start = (u64)page->index << PAGE_CACHE_SHIFT; |
a52d9a80 CM |
1986 | u64 page_end = page_start + PAGE_CACHE_SIZE - 1; |
1987 | u64 block_start; | |
1988 | u64 orig_block_start; | |
1989 | u64 block_end; | |
1990 | u64 cur_end; | |
1991 | struct extent_map *em; | |
1992 | unsigned blocksize = 1 << inode->i_blkbits; | |
1993 | size_t page_offset = 0; | |
1994 | size_t block_off_start; | |
1995 | size_t block_off_end; | |
1996 | int err = 0; | |
1997 | int iocount = 0; | |
1998 | int ret = 0; | |
1999 | int isnew; | |
2000 | ||
b3cfa35a CH |
2001 | set_page_extent_mapped(page); |
2002 | ||
a52d9a80 CM |
2003 | block_start = (page_start + from) & ~((u64)blocksize - 1); |
2004 | block_end = (page_start + to - 1) | (blocksize - 1); | |
2005 | orig_block_start = block_start; | |
2006 | ||
2007 | lock_extent(tree, page_start, page_end, GFP_NOFS); | |
2008 | while(block_start <= block_end) { | |
2009 | em = get_extent(inode, page, page_offset, block_start, | |
2010 | block_end, 1); | |
2011 | if (IS_ERR(em) || !em) { | |
2012 | goto err; | |
2013 | } | |
2014 | cur_end = min(block_end, em->end); | |
2015 | block_off_start = block_start & (PAGE_CACHE_SIZE - 1); | |
2016 | block_off_end = block_off_start + blocksize; | |
2017 | isnew = clear_extent_new(tree, block_start, cur_end, GFP_NOFS); | |
2018 | ||
2019 | if (!PageUptodate(page) && isnew && | |
2020 | (block_off_end > to || block_off_start < from)) { | |
2021 | void *kaddr; | |
2022 | ||
2023 | kaddr = kmap_atomic(page, KM_USER0); | |
2024 | if (block_off_end > to) | |
2025 | memset(kaddr + to, 0, block_off_end - to); | |
2026 | if (block_off_start < from) | |
2027 | memset(kaddr + block_off_start, 0, | |
2028 | from - block_off_start); | |
2029 | flush_dcache_page(page); | |
2030 | kunmap_atomic(kaddr, KM_USER0); | |
2031 | } | |
2032 | if (!isnew && !PageUptodate(page) && | |
2033 | (block_off_end > to || block_off_start < from) && | |
2034 | !test_range_bit(tree, block_start, cur_end, | |
2035 | EXTENT_UPTODATE, 1)) { | |
2036 | u64 sector; | |
2037 | u64 extent_offset = block_start - em->start; | |
2038 | size_t iosize; | |
2039 | sector = (em->block_start + extent_offset) >> 9; | |
2040 | iosize = (cur_end - block_start + blocksize - 1) & | |
2041 | ~((u64)blocksize - 1); | |
2042 | /* | |
2043 | * we've already got the extent locked, but we | |
2044 | * need to split the state such that our end_bio | |
2045 | * handler can clear the lock. | |
2046 | */ | |
2047 | set_extent_bit(tree, block_start, | |
2048 | block_start + iosize - 1, | |
2049 | EXTENT_LOCKED, 0, NULL, GFP_NOFS); | |
2050 | ret = submit_extent_page(READ, tree, page, | |
2051 | sector, iosize, page_offset, em->bdev, | |
b293f02e | 2052 | NULL, 1, |
a52d9a80 CM |
2053 | end_bio_extent_preparewrite); |
2054 | iocount++; | |
2055 | block_start = block_start + iosize; | |
2056 | } else { | |
2057 | set_extent_uptodate(tree, block_start, cur_end, | |
2058 | GFP_NOFS); | |
2059 | unlock_extent(tree, block_start, cur_end, GFP_NOFS); | |
2060 | block_start = cur_end + 1; | |
2061 | } | |
2062 | page_offset = block_start & (PAGE_CACHE_SIZE - 1); | |
2063 | free_extent_map(em); | |
2064 | } | |
2065 | if (iocount) { | |
2066 | wait_extent_bit(tree, orig_block_start, | |
2067 | block_end, EXTENT_LOCKED); | |
2068 | } | |
2069 | check_page_uptodate(tree, page); | |
2070 | err: | |
2071 | /* FIXME, zero out newly allocated blocks on error */ | |
2072 | return err; | |
2073 | } | |
2074 | EXPORT_SYMBOL(extent_prepare_write); | |
2075 | ||
2076 | /* | |
2077 | * a helper for releasepage. As long as there are no locked extents | |
2078 | * in the range corresponding to the page, both state records and extent | |
2079 | * map records are removed | |
2080 | */ | |
2081 | int try_release_extent_mapping(struct extent_map_tree *tree, struct page *page) | |
2082 | { | |
2083 | struct extent_map *em; | |
35ebb934 | 2084 | u64 start = (u64)page->index << PAGE_CACHE_SHIFT; |
a52d9a80 CM |
2085 | u64 end = start + PAGE_CACHE_SIZE - 1; |
2086 | u64 orig_start = start; | |
b888db2b | 2087 | int ret = 1; |
a52d9a80 CM |
2088 | |
2089 | while (start <= end) { | |
2090 | em = lookup_extent_mapping(tree, start, end); | |
2091 | if (!em || IS_ERR(em)) | |
2092 | break; | |
b888db2b CM |
2093 | if (!test_range_bit(tree, em->start, em->end, |
2094 | EXTENT_LOCKED, 0)) { | |
2095 | remove_extent_mapping(tree, em); | |
2096 | /* once for the rb tree */ | |
a52d9a80 | 2097 | free_extent_map(em); |
a52d9a80 | 2098 | } |
a52d9a80 | 2099 | start = em->end + 1; |
a52d9a80 CM |
2100 | /* once for us */ |
2101 | free_extent_map(em); | |
2102 | } | |
b888db2b CM |
2103 | if (test_range_bit(tree, orig_start, end, EXTENT_LOCKED, 0)) |
2104 | ret = 0; | |
2105 | else | |
2106 | clear_extent_bit(tree, orig_start, end, EXTENT_UPTODATE, | |
2107 | 1, 1, GFP_NOFS); | |
2108 | return ret; | |
a52d9a80 CM |
2109 | } |
2110 | EXPORT_SYMBOL(try_release_extent_mapping); | |
2111 | ||
d396c6f5 CH |
2112 | sector_t extent_bmap(struct address_space *mapping, sector_t iblock, |
2113 | get_extent_t *get_extent) | |
2114 | { | |
2115 | struct inode *inode = mapping->host; | |
2116 | u64 start = iblock << inode->i_blkbits; | |
2117 | u64 end = start + (1 << inode->i_blkbits) - 1; | |
c67cda17 | 2118 | sector_t sector = 0; |
d396c6f5 CH |
2119 | struct extent_map *em; |
2120 | ||
2121 | em = get_extent(inode, NULL, 0, start, end, 0); | |
2122 | if (!em || IS_ERR(em)) | |
2123 | return 0; | |
2124 | ||
d396c6f5 | 2125 | if (em->block_start == EXTENT_MAP_INLINE || |
5f39d397 | 2126 | em->block_start == EXTENT_MAP_HOLE) |
c67cda17 | 2127 | goto out; |
d396c6f5 | 2128 | |
c67cda17 Y |
2129 | sector = (em->block_start + start - em->start) >> inode->i_blkbits; |
2130 | out: | |
2131 | free_extent_map(em); | |
2132 | return sector; | |
d396c6f5 | 2133 | } |
5f39d397 | 2134 | |
4dc11904 | 2135 | static int add_lru(struct extent_map_tree *tree, struct extent_buffer *eb) |
6d36dcd4 | 2136 | { |
4dc11904 CM |
2137 | if (list_empty(&eb->lru)) { |
2138 | extent_buffer_get(eb); | |
2139 | list_add(&eb->lru, &tree->buffer_lru); | |
2140 | tree->lru_size++; | |
2141 | if (tree->lru_size >= BUFFER_LRU_MAX) { | |
2142 | struct extent_buffer *rm; | |
2143 | rm = list_entry(tree->buffer_lru.prev, | |
2144 | struct extent_buffer, lru); | |
2145 | tree->lru_size--; | |
856bf3e5 | 2146 | list_del_init(&rm->lru); |
4dc11904 CM |
2147 | free_extent_buffer(rm); |
2148 | } | |
2149 | } else | |
2150 | list_move(&eb->lru, &tree->buffer_lru); | |
2151 | return 0; | |
2152 | } | |
2153 | static struct extent_buffer *find_lru(struct extent_map_tree *tree, | |
2154 | u64 start, unsigned long len) | |
2155 | { | |
2156 | struct list_head *lru = &tree->buffer_lru; | |
2157 | struct list_head *cur = lru->next; | |
2158 | struct extent_buffer *eb; | |
f510cfec | 2159 | |
4dc11904 CM |
2160 | if (list_empty(lru)) |
2161 | return NULL; | |
f510cfec | 2162 | |
4dc11904 CM |
2163 | do { |
2164 | eb = list_entry(cur, struct extent_buffer, lru); | |
2165 | if (eb->start == start && eb->len == len) { | |
2166 | extent_buffer_get(eb); | |
2167 | return eb; | |
2168 | } | |
2169 | cur = cur->next; | |
2170 | } while (cur != lru); | |
2171 | return NULL; | |
6d36dcd4 CM |
2172 | } |
2173 | ||
4dc11904 | 2174 | static inline unsigned long num_extent_pages(u64 start, u64 len) |
6d36dcd4 | 2175 | { |
4dc11904 CM |
2176 | return ((start + len + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT) - |
2177 | (start >> PAGE_CACHE_SHIFT); | |
6d36dcd4 CM |
2178 | } |
2179 | ||
4dc11904 CM |
2180 | static inline struct page *extent_buffer_page(struct extent_buffer *eb, |
2181 | unsigned long i) | |
6d36dcd4 CM |
2182 | { |
2183 | struct page *p; | |
3685f791 | 2184 | struct address_space *mapping; |
db94535d | 2185 | |
4dc11904 | 2186 | if (i == 0) |
810191ff | 2187 | return eb->first_page; |
6d36dcd4 | 2188 | i += eb->start >> PAGE_CACHE_SHIFT; |
3685f791 CM |
2189 | mapping = eb->first_page->mapping; |
2190 | read_lock_irq(&mapping->tree_lock); | |
2191 | p = radix_tree_lookup(&mapping->page_tree, i); | |
2192 | read_unlock_irq(&mapping->tree_lock); | |
6d36dcd4 CM |
2193 | return p; |
2194 | } | |
2195 | ||
4dc11904 CM |
2196 | static struct extent_buffer *__alloc_extent_buffer(struct extent_map_tree *tree, |
2197 | u64 start, | |
2198 | unsigned long len, | |
2199 | gfp_t mask) | |
db94535d | 2200 | { |
4dc11904 CM |
2201 | struct extent_buffer *eb = NULL; |
2202 | ||
2203 | spin_lock(&tree->lru_lock); | |
2204 | eb = find_lru(tree, start, len); | |
4dc11904 | 2205 | spin_unlock(&tree->lru_lock); |
4dc11904 | 2206 | if (eb) { |
09be207d | 2207 | return eb; |
4dc11904 | 2208 | } |
09be207d CM |
2209 | |
2210 | eb = kmem_cache_zalloc(extent_buffer_cache, mask); | |
4dc11904 CM |
2211 | INIT_LIST_HEAD(&eb->lru); |
2212 | eb->start = start; | |
2213 | eb->len = len; | |
2214 | atomic_set(&eb->refs, 1); | |
2215 | ||
4dc11904 CM |
2216 | return eb; |
2217 | } | |
2218 | ||
2219 | static void __free_extent_buffer(struct extent_buffer *eb) | |
2220 | { | |
2221 | kmem_cache_free(extent_buffer_cache, eb); | |
db94535d | 2222 | } |
4dc11904 | 2223 | |
5f39d397 CM |
2224 | struct extent_buffer *alloc_extent_buffer(struct extent_map_tree *tree, |
2225 | u64 start, unsigned long len, | |
19c00ddc | 2226 | struct page *page0, |
5f39d397 CM |
2227 | gfp_t mask) |
2228 | { | |
db94535d | 2229 | unsigned long num_pages = num_extent_pages(start, len); |
5f39d397 CM |
2230 | unsigned long i; |
2231 | unsigned long index = start >> PAGE_CACHE_SHIFT; | |
2232 | struct extent_buffer *eb; | |
2233 | struct page *p; | |
2234 | struct address_space *mapping = tree->mapping; | |
65555a06 | 2235 | int uptodate = 1; |
5f39d397 | 2236 | |
4dc11904 | 2237 | eb = __alloc_extent_buffer(tree, start, len, mask); |
5f39d397 CM |
2238 | if (!eb || IS_ERR(eb)) |
2239 | return NULL; | |
2240 | ||
4dc11904 | 2241 | if (eb->flags & EXTENT_BUFFER_FILLED) |
09be207d | 2242 | goto lru_add; |
5f39d397 | 2243 | |
19c00ddc CM |
2244 | if (page0) { |
2245 | eb->first_page = page0; | |
2246 | i = 1; | |
2247 | index++; | |
2248 | page_cache_get(page0); | |
ff79f819 | 2249 | mark_page_accessed(page0); |
19c00ddc | 2250 | set_page_extent_mapped(page0); |
0591fb56 | 2251 | WARN_ON(!PageUptodate(page0)); |
19c00ddc CM |
2252 | set_page_private(page0, EXTENT_PAGE_PRIVATE_FIRST_PAGE | |
2253 | len << 2); | |
2254 | } else { | |
2255 | i = 0; | |
2256 | } | |
2257 | for (; i < num_pages; i++, index++) { | |
5f39d397 | 2258 | p = find_or_create_page(mapping, index, mask | __GFP_HIGHMEM); |
6d36dcd4 | 2259 | if (!p) { |
db94535d | 2260 | WARN_ON(1); |
5f39d397 | 2261 | goto fail; |
6d36dcd4 | 2262 | } |
f510cfec | 2263 | set_page_extent_mapped(p); |
ff79f819 | 2264 | mark_page_accessed(p); |
19c00ddc | 2265 | if (i == 0) { |
810191ff | 2266 | eb->first_page = p; |
19c00ddc CM |
2267 | set_page_private(p, EXTENT_PAGE_PRIVATE_FIRST_PAGE | |
2268 | len << 2); | |
2269 | } else { | |
2270 | set_page_private(p, EXTENT_PAGE_PRIVATE); | |
2271 | } | |
5f39d397 CM |
2272 | if (!PageUptodate(p)) |
2273 | uptodate = 0; | |
2274 | unlock_page(p); | |
2275 | } | |
2276 | if (uptodate) | |
2277 | eb->flags |= EXTENT_UPTODATE; | |
4dc11904 | 2278 | eb->flags |= EXTENT_BUFFER_FILLED; |
09be207d CM |
2279 | |
2280 | lru_add: | |
2281 | spin_lock(&tree->lru_lock); | |
2282 | add_lru(tree, eb); | |
2283 | spin_unlock(&tree->lru_lock); | |
5f39d397 | 2284 | return eb; |
09be207d | 2285 | |
5f39d397 | 2286 | fail: |
856bf3e5 CM |
2287 | spin_lock(&tree->lru_lock); |
2288 | list_del_init(&eb->lru); | |
2289 | spin_unlock(&tree->lru_lock); | |
09be207d CM |
2290 | if (!atomic_dec_and_test(&eb->refs)) |
2291 | return NULL; | |
0591fb56 | 2292 | for (index = 1; index < i; index++) { |
09be207d CM |
2293 | page_cache_release(extent_buffer_page(eb, index)); |
2294 | } | |
0591fb56 CM |
2295 | if (i > 0) |
2296 | page_cache_release(extent_buffer_page(eb, 0)); | |
09be207d | 2297 | __free_extent_buffer(eb); |
5f39d397 CM |
2298 | return NULL; |
2299 | } | |
2300 | EXPORT_SYMBOL(alloc_extent_buffer); | |
2301 | ||
2302 | struct extent_buffer *find_extent_buffer(struct extent_map_tree *tree, | |
2303 | u64 start, unsigned long len, | |
2304 | gfp_t mask) | |
2305 | { | |
db94535d | 2306 | unsigned long num_pages = num_extent_pages(start, len); |
09be207d CM |
2307 | unsigned long i; |
2308 | unsigned long index = start >> PAGE_CACHE_SHIFT; | |
5f39d397 CM |
2309 | struct extent_buffer *eb; |
2310 | struct page *p; | |
2311 | struct address_space *mapping = tree->mapping; | |
14048ed0 | 2312 | int uptodate = 1; |
5f39d397 | 2313 | |
4dc11904 | 2314 | eb = __alloc_extent_buffer(tree, start, len, mask); |
5f39d397 CM |
2315 | if (!eb || IS_ERR(eb)) |
2316 | return NULL; | |
2317 | ||
4dc11904 | 2318 | if (eb->flags & EXTENT_BUFFER_FILLED) |
09be207d | 2319 | goto lru_add; |
5f39d397 CM |
2320 | |
2321 | for (i = 0; i < num_pages; i++, index++) { | |
14048ed0 | 2322 | p = find_lock_page(mapping, index); |
6d36dcd4 | 2323 | if (!p) { |
5f39d397 | 2324 | goto fail; |
6d36dcd4 | 2325 | } |
f510cfec | 2326 | set_page_extent_mapped(p); |
ff79f819 | 2327 | mark_page_accessed(p); |
19c00ddc CM |
2328 | |
2329 | if (i == 0) { | |
810191ff | 2330 | eb->first_page = p; |
19c00ddc CM |
2331 | set_page_private(p, EXTENT_PAGE_PRIVATE_FIRST_PAGE | |
2332 | len << 2); | |
2333 | } else { | |
2334 | set_page_private(p, EXTENT_PAGE_PRIVATE); | |
2335 | } | |
2336 | ||
14048ed0 CM |
2337 | if (!PageUptodate(p)) |
2338 | uptodate = 0; | |
2339 | unlock_page(p); | |
5f39d397 | 2340 | } |
14048ed0 CM |
2341 | if (uptodate) |
2342 | eb->flags |= EXTENT_UPTODATE; | |
4dc11904 | 2343 | eb->flags |= EXTENT_BUFFER_FILLED; |
09be207d CM |
2344 | |
2345 | lru_add: | |
2346 | spin_lock(&tree->lru_lock); | |
2347 | add_lru(tree, eb); | |
2348 | spin_unlock(&tree->lru_lock); | |
5f39d397 CM |
2349 | return eb; |
2350 | fail: | |
856bf3e5 CM |
2351 | spin_lock(&tree->lru_lock); |
2352 | list_del_init(&eb->lru); | |
2353 | spin_unlock(&tree->lru_lock); | |
09be207d CM |
2354 | if (!atomic_dec_and_test(&eb->refs)) |
2355 | return NULL; | |
0591fb56 | 2356 | for (index = 1; index < i; index++) { |
09be207d CM |
2357 | page_cache_release(extent_buffer_page(eb, index)); |
2358 | } | |
0591fb56 CM |
2359 | if (i > 0) |
2360 | page_cache_release(extent_buffer_page(eb, 0)); | |
09be207d | 2361 | __free_extent_buffer(eb); |
5f39d397 CM |
2362 | return NULL; |
2363 | } | |
2364 | EXPORT_SYMBOL(find_extent_buffer); | |
2365 | ||
2366 | void free_extent_buffer(struct extent_buffer *eb) | |
2367 | { | |
2368 | unsigned long i; | |
2369 | unsigned long num_pages; | |
2370 | ||
2371 | if (!eb) | |
2372 | return; | |
2373 | ||
2374 | if (!atomic_dec_and_test(&eb->refs)) | |
2375 | return; | |
2376 | ||
0591fb56 | 2377 | WARN_ON(!list_empty(&eb->lru)); |
db94535d | 2378 | num_pages = num_extent_pages(eb->start, eb->len); |
5f39d397 | 2379 | |
0591fb56 | 2380 | for (i = 1; i < num_pages; i++) { |
6d36dcd4 | 2381 | page_cache_release(extent_buffer_page(eb, i)); |
5f39d397 | 2382 | } |
0591fb56 | 2383 | page_cache_release(extent_buffer_page(eb, 0)); |
6d36dcd4 | 2384 | __free_extent_buffer(eb); |
5f39d397 CM |
2385 | } |
2386 | EXPORT_SYMBOL(free_extent_buffer); | |
2387 | ||
2388 | int clear_extent_buffer_dirty(struct extent_map_tree *tree, | |
2389 | struct extent_buffer *eb) | |
2390 | { | |
2391 | int set; | |
2392 | unsigned long i; | |
2393 | unsigned long num_pages; | |
2394 | struct page *page; | |
2395 | ||
2396 | u64 start = eb->start; | |
2397 | u64 end = start + eb->len - 1; | |
2398 | ||
2399 | set = clear_extent_dirty(tree, start, end, GFP_NOFS); | |
db94535d | 2400 | num_pages = num_extent_pages(eb->start, eb->len); |
5f39d397 CM |
2401 | |
2402 | for (i = 0; i < num_pages; i++) { | |
6d36dcd4 | 2403 | page = extent_buffer_page(eb, i); |
5f39d397 CM |
2404 | lock_page(page); |
2405 | /* | |
2406 | * if we're on the last page or the first page and the | |
2407 | * block isn't aligned on a page boundary, do extra checks | |
2408 | * to make sure we don't clean page that is partially dirty | |
2409 | */ | |
2410 | if ((i == 0 && (eb->start & (PAGE_CACHE_SIZE - 1))) || | |
2411 | ((i == num_pages - 1) && | |
65555a06 | 2412 | ((eb->start + eb->len) & (PAGE_CACHE_SIZE - 1)))) { |
35ebb934 | 2413 | start = (u64)page->index << PAGE_CACHE_SHIFT; |
5f39d397 CM |
2414 | end = start + PAGE_CACHE_SIZE - 1; |
2415 | if (test_range_bit(tree, start, end, | |
2416 | EXTENT_DIRTY, 0)) { | |
2417 | unlock_page(page); | |
2418 | continue; | |
2419 | } | |
2420 | } | |
2421 | clear_page_dirty_for_io(page); | |
7073c8e8 CM |
2422 | write_lock_irq(&page->mapping->tree_lock); |
2423 | if (!PageDirty(page)) { | |
2424 | radix_tree_tag_clear(&page->mapping->page_tree, | |
2425 | page_index(page), | |
2426 | PAGECACHE_TAG_DIRTY); | |
2427 | } | |
2428 | write_unlock_irq(&page->mapping->tree_lock); | |
5f39d397 CM |
2429 | unlock_page(page); |
2430 | } | |
2431 | return 0; | |
2432 | } | |
2433 | EXPORT_SYMBOL(clear_extent_buffer_dirty); | |
2434 | ||
2435 | int wait_on_extent_buffer_writeback(struct extent_map_tree *tree, | |
2436 | struct extent_buffer *eb) | |
2437 | { | |
2438 | return wait_on_extent_writeback(tree, eb->start, | |
2439 | eb->start + eb->len - 1); | |
2440 | } | |
2441 | EXPORT_SYMBOL(wait_on_extent_buffer_writeback); | |
2442 | ||
2443 | int set_extent_buffer_dirty(struct extent_map_tree *tree, | |
2444 | struct extent_buffer *eb) | |
2445 | { | |
810191ff CM |
2446 | unsigned long i; |
2447 | unsigned long num_pages; | |
2448 | ||
2449 | num_pages = num_extent_pages(eb->start, eb->len); | |
2450 | for (i = 0; i < num_pages; i++) { | |
19c00ddc CM |
2451 | struct page *page = extent_buffer_page(eb, i); |
2452 | /* writepage may need to do something special for the | |
2453 | * first page, we have to make sure page->private is | |
2454 | * properly set. releasepage may drop page->private | |
2455 | * on us if the page isn't already dirty. | |
2456 | */ | |
2457 | if (i == 0) { | |
2458 | lock_page(page); | |
2459 | set_page_private(page, | |
2460 | EXTENT_PAGE_PRIVATE_FIRST_PAGE | | |
2461 | eb->len << 2); | |
2462 | } | |
810191ff | 2463 | __set_page_dirty_nobuffers(extent_buffer_page(eb, i)); |
19c00ddc CM |
2464 | if (i == 0) |
2465 | unlock_page(page); | |
810191ff CM |
2466 | } |
2467 | return set_extent_dirty(tree, eb->start, | |
2468 | eb->start + eb->len - 1, GFP_NOFS); | |
5f39d397 CM |
2469 | } |
2470 | EXPORT_SYMBOL(set_extent_buffer_dirty); | |
2471 | ||
2472 | int set_extent_buffer_uptodate(struct extent_map_tree *tree, | |
2473 | struct extent_buffer *eb) | |
2474 | { | |
2475 | unsigned long i; | |
2476 | struct page *page; | |
2477 | unsigned long num_pages; | |
2478 | ||
db94535d | 2479 | num_pages = num_extent_pages(eb->start, eb->len); |
5f39d397 CM |
2480 | |
2481 | set_extent_uptodate(tree, eb->start, eb->start + eb->len - 1, | |
2482 | GFP_NOFS); | |
2483 | for (i = 0; i < num_pages; i++) { | |
6d36dcd4 | 2484 | page = extent_buffer_page(eb, i); |
5f39d397 CM |
2485 | if ((i == 0 && (eb->start & (PAGE_CACHE_SIZE - 1))) || |
2486 | ((i == num_pages - 1) && | |
65555a06 | 2487 | ((eb->start + eb->len) & (PAGE_CACHE_SIZE - 1)))) { |
5f39d397 CM |
2488 | check_page_uptodate(tree, page); |
2489 | continue; | |
2490 | } | |
2491 | SetPageUptodate(page); | |
2492 | } | |
2493 | return 0; | |
2494 | } | |
2495 | EXPORT_SYMBOL(set_extent_buffer_uptodate); | |
2496 | ||
2497 | int extent_buffer_uptodate(struct extent_map_tree *tree, | |
2498 | struct extent_buffer *eb) | |
2499 | { | |
2500 | if (eb->flags & EXTENT_UPTODATE) | |
2501 | return 1; | |
2502 | return test_range_bit(tree, eb->start, eb->start + eb->len - 1, | |
2503 | EXTENT_UPTODATE, 1); | |
2504 | } | |
2505 | EXPORT_SYMBOL(extent_buffer_uptodate); | |
2506 | ||
2507 | int read_extent_buffer_pages(struct extent_map_tree *tree, | |
19c00ddc CM |
2508 | struct extent_buffer *eb, |
2509 | u64 start, | |
2510 | int wait) | |
5f39d397 CM |
2511 | { |
2512 | unsigned long i; | |
19c00ddc | 2513 | unsigned long start_i; |
5f39d397 CM |
2514 | struct page *page; |
2515 | int err; | |
2516 | int ret = 0; | |
2517 | unsigned long num_pages; | |
2518 | ||
2519 | if (eb->flags & EXTENT_UPTODATE) | |
2520 | return 0; | |
2521 | ||
14048ed0 | 2522 | if (0 && test_range_bit(tree, eb->start, eb->start + eb->len - 1, |
5f39d397 CM |
2523 | EXTENT_UPTODATE, 1)) { |
2524 | return 0; | |
2525 | } | |
0591fb56 | 2526 | |
19c00ddc CM |
2527 | if (start) { |
2528 | WARN_ON(start < eb->start); | |
2529 | start_i = (start >> PAGE_CACHE_SHIFT) - | |
2530 | (eb->start >> PAGE_CACHE_SHIFT); | |
2531 | } else { | |
2532 | start_i = 0; | |
2533 | } | |
5f39d397 | 2534 | |
db94535d | 2535 | num_pages = num_extent_pages(eb->start, eb->len); |
19c00ddc | 2536 | for (i = start_i; i < num_pages; i++) { |
6d36dcd4 | 2537 | page = extent_buffer_page(eb, i); |
5f39d397 CM |
2538 | if (PageUptodate(page)) { |
2539 | continue; | |
2540 | } | |
2541 | if (!wait) { | |
2542 | if (TestSetPageLocked(page)) { | |
2543 | continue; | |
2544 | } | |
2545 | } else { | |
2546 | lock_page(page); | |
2547 | } | |
2548 | if (!PageUptodate(page)) { | |
2549 | err = page->mapping->a_ops->readpage(NULL, page); | |
2550 | if (err) { | |
2551 | ret = err; | |
2552 | } | |
2553 | } else { | |
2554 | unlock_page(page); | |
2555 | } | |
2556 | } | |
2557 | ||
2558 | if (ret || !wait) { | |
2559 | return ret; | |
2560 | } | |
2561 | ||
19c00ddc | 2562 | for (i = start_i; i < num_pages; i++) { |
6d36dcd4 | 2563 | page = extent_buffer_page(eb, i); |
5f39d397 CM |
2564 | wait_on_page_locked(page); |
2565 | if (!PageUptodate(page)) { | |
2566 | ret = -EIO; | |
2567 | } | |
2568 | } | |
4dc11904 CM |
2569 | if (!ret) |
2570 | eb->flags |= EXTENT_UPTODATE; | |
5f39d397 CM |
2571 | return ret; |
2572 | } | |
2573 | EXPORT_SYMBOL(read_extent_buffer_pages); | |
2574 | ||
2575 | void read_extent_buffer(struct extent_buffer *eb, void *dstv, | |
2576 | unsigned long start, | |
2577 | unsigned long len) | |
2578 | { | |
2579 | size_t cur; | |
2580 | size_t offset; | |
2581 | struct page *page; | |
2582 | char *kaddr; | |
2583 | char *dst = (char *)dstv; | |
2584 | size_t start_offset = eb->start & ((u64)PAGE_CACHE_SIZE - 1); | |
2585 | unsigned long i = (start_offset + start) >> PAGE_CACHE_SHIFT; | |
14048ed0 | 2586 | unsigned long num_pages = num_extent_pages(eb->start, eb->len); |
5f39d397 CM |
2587 | |
2588 | WARN_ON(start > eb->len); | |
2589 | WARN_ON(start + len > eb->start + eb->len); | |
2590 | ||
3685f791 | 2591 | offset = (start_offset + start) & ((unsigned long)PAGE_CACHE_SIZE - 1); |
5f39d397 CM |
2592 | |
2593 | while(len > 0) { | |
6d36dcd4 | 2594 | page = extent_buffer_page(eb, i); |
14048ed0 CM |
2595 | if (!PageUptodate(page)) { |
2596 | printk("page %lu not up to date i %lu, total %lu, len %lu\n", page->index, i, num_pages, eb->len); | |
2597 | WARN_ON(1); | |
2598 | } | |
5f39d397 CM |
2599 | WARN_ON(!PageUptodate(page)); |
2600 | ||
2601 | cur = min(len, (PAGE_CACHE_SIZE - offset)); | |
59d169e2 | 2602 | kaddr = kmap_atomic(page, KM_USER1); |
5f39d397 | 2603 | memcpy(dst, kaddr + offset, cur); |
59d169e2 | 2604 | kunmap_atomic(kaddr, KM_USER1); |
5f39d397 CM |
2605 | |
2606 | dst += cur; | |
2607 | len -= cur; | |
2608 | offset = 0; | |
2609 | i++; | |
5f39d397 CM |
2610 | } |
2611 | } | |
2612 | EXPORT_SYMBOL(read_extent_buffer); | |
2613 | ||
19c00ddc | 2614 | int map_private_extent_buffer(struct extent_buffer *eb, unsigned long start, |
db94535d CM |
2615 | unsigned long min_len, char **token, char **map, |
2616 | unsigned long *map_start, | |
2617 | unsigned long *map_len, int km) | |
5f39d397 | 2618 | { |
479965d6 | 2619 | size_t offset = start & (PAGE_CACHE_SIZE - 1); |
5f39d397 | 2620 | char *kaddr; |
db94535d | 2621 | struct page *p; |
5f39d397 CM |
2622 | size_t start_offset = eb->start & ((u64)PAGE_CACHE_SIZE - 1); |
2623 | unsigned long i = (start_offset + start) >> PAGE_CACHE_SHIFT; | |
65555a06 | 2624 | unsigned long end_i = (start_offset + start + min_len - 1) >> |
810191ff | 2625 | PAGE_CACHE_SHIFT; |
479965d6 CM |
2626 | |
2627 | if (i != end_i) | |
2628 | return -EINVAL; | |
5f39d397 | 2629 | |
5f39d397 CM |
2630 | if (i == 0) { |
2631 | offset = start_offset; | |
2632 | *map_start = 0; | |
2633 | } else { | |
db94535d | 2634 | offset = 0; |
0591fb56 | 2635 | *map_start = ((u64)i << PAGE_CACHE_SHIFT) - start_offset; |
5f39d397 | 2636 | } |
65555a06 | 2637 | if (start + min_len > eb->len) { |
19c00ddc CM |
2638 | printk("bad mapping eb start %Lu len %lu, wanted %lu %lu\n", eb->start, eb->len, start, min_len); |
2639 | WARN_ON(1); | |
2640 | } | |
5f39d397 | 2641 | |
db94535d CM |
2642 | p = extent_buffer_page(eb, i); |
2643 | WARN_ON(!PageUptodate(p)); | |
2644 | kaddr = kmap_atomic(p, km); | |
5f39d397 CM |
2645 | *token = kaddr; |
2646 | *map = kaddr + offset; | |
2647 | *map_len = PAGE_CACHE_SIZE - offset; | |
2648 | return 0; | |
2649 | } | |
19c00ddc | 2650 | EXPORT_SYMBOL(map_private_extent_buffer); |
db94535d CM |
2651 | |
2652 | int map_extent_buffer(struct extent_buffer *eb, unsigned long start, | |
2653 | unsigned long min_len, | |
2654 | char **token, char **map, | |
2655 | unsigned long *map_start, | |
2656 | unsigned long *map_len, int km) | |
2657 | { | |
2658 | int err; | |
2659 | int save = 0; | |
2660 | if (eb->map_token) { | |
db94535d CM |
2661 | unmap_extent_buffer(eb, eb->map_token, km); |
2662 | eb->map_token = NULL; | |
2663 | save = 1; | |
2664 | } | |
19c00ddc CM |
2665 | err = map_private_extent_buffer(eb, start, min_len, token, map, |
2666 | map_start, map_len, km); | |
db94535d CM |
2667 | if (!err && save) { |
2668 | eb->map_token = *token; | |
2669 | eb->kaddr = *map; | |
2670 | eb->map_start = *map_start; | |
2671 | eb->map_len = *map_len; | |
2672 | } | |
2673 | return err; | |
2674 | } | |
5f39d397 CM |
2675 | EXPORT_SYMBOL(map_extent_buffer); |
2676 | ||
2677 | void unmap_extent_buffer(struct extent_buffer *eb, char *token, int km) | |
2678 | { | |
ae5252bd | 2679 | kunmap_atomic(token, km); |
5f39d397 CM |
2680 | } |
2681 | EXPORT_SYMBOL(unmap_extent_buffer); | |
2682 | ||
2683 | int memcmp_extent_buffer(struct extent_buffer *eb, const void *ptrv, | |
2684 | unsigned long start, | |
2685 | unsigned long len) | |
2686 | { | |
2687 | size_t cur; | |
2688 | size_t offset; | |
2689 | struct page *page; | |
2690 | char *kaddr; | |
2691 | char *ptr = (char *)ptrv; | |
2692 | size_t start_offset = eb->start & ((u64)PAGE_CACHE_SIZE - 1); | |
2693 | unsigned long i = (start_offset + start) >> PAGE_CACHE_SHIFT; | |
2694 | int ret = 0; | |
2695 | ||
2696 | WARN_ON(start > eb->len); | |
2697 | WARN_ON(start + len > eb->start + eb->len); | |
2698 | ||
3685f791 | 2699 | offset = (start_offset + start) & ((unsigned long)PAGE_CACHE_SIZE - 1); |
5f39d397 CM |
2700 | |
2701 | while(len > 0) { | |
6d36dcd4 | 2702 | page = extent_buffer_page(eb, i); |
5f39d397 CM |
2703 | WARN_ON(!PageUptodate(page)); |
2704 | ||
2705 | cur = min(len, (PAGE_CACHE_SIZE - offset)); | |
2706 | ||
ae5252bd | 2707 | kaddr = kmap_atomic(page, KM_USER0); |
5f39d397 | 2708 | ret = memcmp(ptr, kaddr + offset, cur); |
ae5252bd | 2709 | kunmap_atomic(kaddr, KM_USER0); |
5f39d397 CM |
2710 | if (ret) |
2711 | break; | |
2712 | ||
2713 | ptr += cur; | |
2714 | len -= cur; | |
2715 | offset = 0; | |
2716 | i++; | |
5f39d397 CM |
2717 | } |
2718 | return ret; | |
2719 | } | |
2720 | EXPORT_SYMBOL(memcmp_extent_buffer); | |
2721 | ||
2722 | void write_extent_buffer(struct extent_buffer *eb, const void *srcv, | |
2723 | unsigned long start, unsigned long len) | |
2724 | { | |
2725 | size_t cur; | |
2726 | size_t offset; | |
2727 | struct page *page; | |
2728 | char *kaddr; | |
2729 | char *src = (char *)srcv; | |
2730 | size_t start_offset = eb->start & ((u64)PAGE_CACHE_SIZE - 1); | |
2731 | unsigned long i = (start_offset + start) >> PAGE_CACHE_SHIFT; | |
2732 | ||
2733 | WARN_ON(start > eb->len); | |
2734 | WARN_ON(start + len > eb->start + eb->len); | |
2735 | ||
3685f791 | 2736 | offset = (start_offset + start) & ((unsigned long)PAGE_CACHE_SIZE - 1); |
5f39d397 CM |
2737 | |
2738 | while(len > 0) { | |
6d36dcd4 | 2739 | page = extent_buffer_page(eb, i); |
5f39d397 CM |
2740 | WARN_ON(!PageUptodate(page)); |
2741 | ||
2742 | cur = min(len, PAGE_CACHE_SIZE - offset); | |
59d169e2 | 2743 | kaddr = kmap_atomic(page, KM_USER1); |
5f39d397 | 2744 | memcpy(kaddr + offset, src, cur); |
59d169e2 | 2745 | kunmap_atomic(kaddr, KM_USER1); |
5f39d397 CM |
2746 | |
2747 | src += cur; | |
2748 | len -= cur; | |
2749 | offset = 0; | |
2750 | i++; | |
5f39d397 CM |
2751 | } |
2752 | } | |
2753 | EXPORT_SYMBOL(write_extent_buffer); | |
2754 | ||
2755 | void memset_extent_buffer(struct extent_buffer *eb, char c, | |
2756 | unsigned long start, unsigned long len) | |
2757 | { | |
2758 | size_t cur; | |
2759 | size_t offset; | |
2760 | struct page *page; | |
2761 | char *kaddr; | |
2762 | size_t start_offset = eb->start & ((u64)PAGE_CACHE_SIZE - 1); | |
2763 | unsigned long i = (start_offset + start) >> PAGE_CACHE_SHIFT; | |
2764 | ||
2765 | WARN_ON(start > eb->len); | |
2766 | WARN_ON(start + len > eb->start + eb->len); | |
2767 | ||
3685f791 | 2768 | offset = (start_offset + start) & ((unsigned long)PAGE_CACHE_SIZE - 1); |
5f39d397 CM |
2769 | |
2770 | while(len > 0) { | |
6d36dcd4 | 2771 | page = extent_buffer_page(eb, i); |
5f39d397 CM |
2772 | WARN_ON(!PageUptodate(page)); |
2773 | ||
2774 | cur = min(len, PAGE_CACHE_SIZE - offset); | |
ae5252bd | 2775 | kaddr = kmap_atomic(page, KM_USER0); |
5f39d397 | 2776 | memset(kaddr + offset, c, cur); |
ae5252bd | 2777 | kunmap_atomic(kaddr, KM_USER0); |
5f39d397 CM |
2778 | |
2779 | len -= cur; | |
2780 | offset = 0; | |
2781 | i++; | |
5f39d397 CM |
2782 | } |
2783 | } | |
2784 | EXPORT_SYMBOL(memset_extent_buffer); | |
2785 | ||
2786 | void copy_extent_buffer(struct extent_buffer *dst, struct extent_buffer *src, | |
2787 | unsigned long dst_offset, unsigned long src_offset, | |
2788 | unsigned long len) | |
2789 | { | |
2790 | u64 dst_len = dst->len; | |
2791 | size_t cur; | |
2792 | size_t offset; | |
2793 | struct page *page; | |
2794 | char *kaddr; | |
2795 | size_t start_offset = dst->start & ((u64)PAGE_CACHE_SIZE - 1); | |
2796 | unsigned long i = (start_offset + dst_offset) >> PAGE_CACHE_SHIFT; | |
2797 | ||
2798 | WARN_ON(src->len != dst_len); | |
2799 | ||
3685f791 CM |
2800 | offset = (start_offset + dst_offset) & |
2801 | ((unsigned long)PAGE_CACHE_SIZE - 1); | |
5f39d397 CM |
2802 | |
2803 | while(len > 0) { | |
6d36dcd4 | 2804 | page = extent_buffer_page(dst, i); |
5f39d397 CM |
2805 | WARN_ON(!PageUptodate(page)); |
2806 | ||
2807 | cur = min(len, (unsigned long)(PAGE_CACHE_SIZE - offset)); | |
2808 | ||
ff190c0c | 2809 | kaddr = kmap_atomic(page, KM_USER0); |
5f39d397 | 2810 | read_extent_buffer(src, kaddr + offset, src_offset, cur); |
ff190c0c | 2811 | kunmap_atomic(kaddr, KM_USER0); |
5f39d397 CM |
2812 | |
2813 | src_offset += cur; | |
2814 | len -= cur; | |
2815 | offset = 0; | |
2816 | i++; | |
2817 | } | |
2818 | } | |
2819 | EXPORT_SYMBOL(copy_extent_buffer); | |
2820 | ||
2821 | static void move_pages(struct page *dst_page, struct page *src_page, | |
2822 | unsigned long dst_off, unsigned long src_off, | |
2823 | unsigned long len) | |
2824 | { | |
ae5252bd | 2825 | char *dst_kaddr = kmap_atomic(dst_page, KM_USER0); |
5f39d397 CM |
2826 | if (dst_page == src_page) { |
2827 | memmove(dst_kaddr + dst_off, dst_kaddr + src_off, len); | |
2828 | } else { | |
ae5252bd | 2829 | char *src_kaddr = kmap_atomic(src_page, KM_USER1); |
5f39d397 CM |
2830 | char *p = dst_kaddr + dst_off + len; |
2831 | char *s = src_kaddr + src_off + len; | |
2832 | ||
2833 | while (len--) | |
2834 | *--p = *--s; | |
2835 | ||
ae5252bd | 2836 | kunmap_atomic(src_kaddr, KM_USER1); |
5f39d397 | 2837 | } |
ae5252bd | 2838 | kunmap_atomic(dst_kaddr, KM_USER0); |
5f39d397 CM |
2839 | } |
2840 | ||
2841 | static void copy_pages(struct page *dst_page, struct page *src_page, | |
2842 | unsigned long dst_off, unsigned long src_off, | |
2843 | unsigned long len) | |
2844 | { | |
ae5252bd | 2845 | char *dst_kaddr = kmap_atomic(dst_page, KM_USER0); |
5f39d397 CM |
2846 | char *src_kaddr; |
2847 | ||
2848 | if (dst_page != src_page) | |
ae5252bd | 2849 | src_kaddr = kmap_atomic(src_page, KM_USER1); |
5f39d397 CM |
2850 | else |
2851 | src_kaddr = dst_kaddr; | |
2852 | ||
2853 | memcpy(dst_kaddr + dst_off, src_kaddr + src_off, len); | |
5f39d397 CM |
2854 | kunmap_atomic(dst_kaddr, KM_USER0); |
2855 | if (dst_page != src_page) | |
2856 | kunmap_atomic(src_kaddr, KM_USER1); | |
5f39d397 CM |
2857 | } |
2858 | ||
2859 | void memcpy_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset, | |
2860 | unsigned long src_offset, unsigned long len) | |
2861 | { | |
2862 | size_t cur; | |
2863 | size_t dst_off_in_page; | |
2864 | size_t src_off_in_page; | |
2865 | size_t start_offset = dst->start & ((u64)PAGE_CACHE_SIZE - 1); | |
2866 | unsigned long dst_i; | |
2867 | unsigned long src_i; | |
2868 | ||
2869 | if (src_offset + len > dst->len) { | |
2870 | printk("memmove bogus src_offset %lu move len %lu len %lu\n", | |
2871 | src_offset, len, dst->len); | |
2872 | BUG_ON(1); | |
2873 | } | |
2874 | if (dst_offset + len > dst->len) { | |
2875 | printk("memmove bogus dst_offset %lu move len %lu len %lu\n", | |
2876 | dst_offset, len, dst->len); | |
2877 | BUG_ON(1); | |
2878 | } | |
2879 | ||
2880 | while(len > 0) { | |
3685f791 | 2881 | dst_off_in_page = (start_offset + dst_offset) & |
5f39d397 | 2882 | ((unsigned long)PAGE_CACHE_SIZE - 1); |
3685f791 | 2883 | src_off_in_page = (start_offset + src_offset) & |
5f39d397 CM |
2884 | ((unsigned long)PAGE_CACHE_SIZE - 1); |
2885 | ||
2886 | dst_i = (start_offset + dst_offset) >> PAGE_CACHE_SHIFT; | |
2887 | src_i = (start_offset + src_offset) >> PAGE_CACHE_SHIFT; | |
2888 | ||
5f39d397 CM |
2889 | cur = min(len, (unsigned long)(PAGE_CACHE_SIZE - |
2890 | src_off_in_page)); | |
ae2f5411 JA |
2891 | cur = min_t(unsigned long, cur, |
2892 | (unsigned long)(PAGE_CACHE_SIZE - dst_off_in_page)); | |
5f39d397 | 2893 | |
6d36dcd4 CM |
2894 | copy_pages(extent_buffer_page(dst, dst_i), |
2895 | extent_buffer_page(dst, src_i), | |
5f39d397 CM |
2896 | dst_off_in_page, src_off_in_page, cur); |
2897 | ||
2898 | src_offset += cur; | |
2899 | dst_offset += cur; | |
2900 | len -= cur; | |
2901 | } | |
2902 | } | |
2903 | EXPORT_SYMBOL(memcpy_extent_buffer); | |
2904 | ||
2905 | void memmove_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset, | |
2906 | unsigned long src_offset, unsigned long len) | |
2907 | { | |
2908 | size_t cur; | |
2909 | size_t dst_off_in_page; | |
2910 | size_t src_off_in_page; | |
2911 | unsigned long dst_end = dst_offset + len - 1; | |
2912 | unsigned long src_end = src_offset + len - 1; | |
2913 | size_t start_offset = dst->start & ((u64)PAGE_CACHE_SIZE - 1); | |
2914 | unsigned long dst_i; | |
2915 | unsigned long src_i; | |
2916 | ||
2917 | if (src_offset + len > dst->len) { | |
2918 | printk("memmove bogus src_offset %lu move len %lu len %lu\n", | |
2919 | src_offset, len, dst->len); | |
2920 | BUG_ON(1); | |
2921 | } | |
2922 | if (dst_offset + len > dst->len) { | |
2923 | printk("memmove bogus dst_offset %lu move len %lu len %lu\n", | |
2924 | dst_offset, len, dst->len); | |
2925 | BUG_ON(1); | |
2926 | } | |
2927 | if (dst_offset < src_offset) { | |
2928 | memcpy_extent_buffer(dst, dst_offset, src_offset, len); | |
2929 | return; | |
2930 | } | |
2931 | while(len > 0) { | |
2932 | dst_i = (start_offset + dst_end) >> PAGE_CACHE_SHIFT; | |
2933 | src_i = (start_offset + src_end) >> PAGE_CACHE_SHIFT; | |
2934 | ||
3685f791 | 2935 | dst_off_in_page = (start_offset + dst_end) & |
5f39d397 | 2936 | ((unsigned long)PAGE_CACHE_SIZE - 1); |
3685f791 | 2937 | src_off_in_page = (start_offset + src_end) & |
5f39d397 | 2938 | ((unsigned long)PAGE_CACHE_SIZE - 1); |
5f39d397 | 2939 | |
ae2f5411 | 2940 | cur = min_t(unsigned long, len, src_off_in_page + 1); |
5f39d397 | 2941 | cur = min(cur, dst_off_in_page + 1); |
6d36dcd4 CM |
2942 | move_pages(extent_buffer_page(dst, dst_i), |
2943 | extent_buffer_page(dst, src_i), | |
5f39d397 CM |
2944 | dst_off_in_page - cur + 1, |
2945 | src_off_in_page - cur + 1, cur); | |
2946 | ||
db94535d CM |
2947 | dst_end -= cur; |
2948 | src_end -= cur; | |
5f39d397 CM |
2949 | len -= cur; |
2950 | } | |
2951 | } | |
2952 | EXPORT_SYMBOL(memmove_extent_buffer); |