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Commit | Line | Data |
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d1310b2e CM |
1 | #include <linux/bitops.h> |
2 | #include <linux/slab.h> | |
3 | #include <linux/bio.h> | |
4 | #include <linux/mm.h> | |
d1310b2e CM |
5 | #include <linux/pagemap.h> |
6 | #include <linux/page-flags.h> | |
7 | #include <linux/module.h> | |
8 | #include <linux/spinlock.h> | |
9 | #include <linux/blkdev.h> | |
10 | #include <linux/swap.h> | |
d1310b2e CM |
11 | #include <linux/writeback.h> |
12 | #include <linux/pagevec.h> | |
268bb0ce | 13 | #include <linux/prefetch.h> |
90a887c9 | 14 | #include <linux/cleancache.h> |
d1310b2e CM |
15 | #include "extent_io.h" |
16 | #include "extent_map.h" | |
2db04966 | 17 | #include "compat.h" |
902b22f3 DW |
18 | #include "ctree.h" |
19 | #include "btrfs_inode.h" | |
4a54c8c1 | 20 | #include "volumes.h" |
21adbd5c | 21 | #include "check-integrity.h" |
0b32f4bb | 22 | #include "locking.h" |
d1310b2e | 23 | |
d1310b2e CM |
24 | static struct kmem_cache *extent_state_cache; |
25 | static struct kmem_cache *extent_buffer_cache; | |
26 | ||
27 | static LIST_HEAD(buffers); | |
28 | static LIST_HEAD(states); | |
4bef0848 | 29 | |
b47eda86 | 30 | #define LEAK_DEBUG 0 |
3935127c | 31 | #if LEAK_DEBUG |
d397712b | 32 | static DEFINE_SPINLOCK(leak_lock); |
4bef0848 | 33 | #endif |
d1310b2e | 34 | |
d1310b2e CM |
35 | #define BUFFER_LRU_MAX 64 |
36 | ||
37 | struct tree_entry { | |
38 | u64 start; | |
39 | u64 end; | |
d1310b2e CM |
40 | struct rb_node rb_node; |
41 | }; | |
42 | ||
43 | struct extent_page_data { | |
44 | struct bio *bio; | |
45 | struct extent_io_tree *tree; | |
46 | get_extent_t *get_extent; | |
771ed689 CM |
47 | |
48 | /* tells writepage not to lock the state bits for this range | |
49 | * it still does the unlocking | |
50 | */ | |
ffbd517d CM |
51 | unsigned int extent_locked:1; |
52 | ||
53 | /* tells the submit_bio code to use a WRITE_SYNC */ | |
54 | unsigned int sync_io:1; | |
d1310b2e CM |
55 | }; |
56 | ||
0b32f4bb | 57 | static noinline void flush_write_bio(void *data); |
c2d904e0 JM |
58 | static inline struct btrfs_fs_info * |
59 | tree_fs_info(struct extent_io_tree *tree) | |
60 | { | |
61 | return btrfs_sb(tree->mapping->host->i_sb); | |
62 | } | |
0b32f4bb | 63 | |
d1310b2e CM |
64 | int __init extent_io_init(void) |
65 | { | |
9601e3f6 CH |
66 | extent_state_cache = kmem_cache_create("extent_state", |
67 | sizeof(struct extent_state), 0, | |
68 | SLAB_RECLAIM_ACCOUNT | SLAB_MEM_SPREAD, NULL); | |
d1310b2e CM |
69 | if (!extent_state_cache) |
70 | return -ENOMEM; | |
71 | ||
9601e3f6 CH |
72 | extent_buffer_cache = kmem_cache_create("extent_buffers", |
73 | sizeof(struct extent_buffer), 0, | |
74 | SLAB_RECLAIM_ACCOUNT | SLAB_MEM_SPREAD, NULL); | |
d1310b2e CM |
75 | if (!extent_buffer_cache) |
76 | goto free_state_cache; | |
77 | return 0; | |
78 | ||
79 | free_state_cache: | |
80 | kmem_cache_destroy(extent_state_cache); | |
81 | return -ENOMEM; | |
82 | } | |
83 | ||
84 | void extent_io_exit(void) | |
85 | { | |
86 | struct extent_state *state; | |
2d2ae547 | 87 | struct extent_buffer *eb; |
d1310b2e CM |
88 | |
89 | while (!list_empty(&states)) { | |
2d2ae547 | 90 | state = list_entry(states.next, struct extent_state, leak_list); |
d397712b CM |
91 | printk(KERN_ERR "btrfs state leak: start %llu end %llu " |
92 | "state %lu in tree %p refs %d\n", | |
93 | (unsigned long long)state->start, | |
94 | (unsigned long long)state->end, | |
95 | state->state, state->tree, atomic_read(&state->refs)); | |
2d2ae547 | 96 | list_del(&state->leak_list); |
d1310b2e CM |
97 | kmem_cache_free(extent_state_cache, state); |
98 | ||
99 | } | |
100 | ||
2d2ae547 CM |
101 | while (!list_empty(&buffers)) { |
102 | eb = list_entry(buffers.next, struct extent_buffer, leak_list); | |
d397712b CM |
103 | printk(KERN_ERR "btrfs buffer leak start %llu len %lu " |
104 | "refs %d\n", (unsigned long long)eb->start, | |
105 | eb->len, atomic_read(&eb->refs)); | |
2d2ae547 CM |
106 | list_del(&eb->leak_list); |
107 | kmem_cache_free(extent_buffer_cache, eb); | |
108 | } | |
d1310b2e CM |
109 | if (extent_state_cache) |
110 | kmem_cache_destroy(extent_state_cache); | |
111 | if (extent_buffer_cache) | |
112 | kmem_cache_destroy(extent_buffer_cache); | |
113 | } | |
114 | ||
115 | void extent_io_tree_init(struct extent_io_tree *tree, | |
f993c883 | 116 | struct address_space *mapping) |
d1310b2e | 117 | { |
6bef4d31 | 118 | tree->state = RB_ROOT; |
19fe0a8b | 119 | INIT_RADIX_TREE(&tree->buffer, GFP_ATOMIC); |
d1310b2e CM |
120 | tree->ops = NULL; |
121 | tree->dirty_bytes = 0; | |
70dec807 | 122 | spin_lock_init(&tree->lock); |
6af118ce | 123 | spin_lock_init(&tree->buffer_lock); |
d1310b2e | 124 | tree->mapping = mapping; |
d1310b2e | 125 | } |
d1310b2e | 126 | |
b2950863 | 127 | static struct extent_state *alloc_extent_state(gfp_t mask) |
d1310b2e CM |
128 | { |
129 | struct extent_state *state; | |
3935127c | 130 | #if LEAK_DEBUG |
2d2ae547 | 131 | unsigned long flags; |
4bef0848 | 132 | #endif |
d1310b2e CM |
133 | |
134 | state = kmem_cache_alloc(extent_state_cache, mask); | |
2b114d1d | 135 | if (!state) |
d1310b2e CM |
136 | return state; |
137 | state->state = 0; | |
d1310b2e | 138 | state->private = 0; |
70dec807 | 139 | state->tree = NULL; |
3935127c | 140 | #if LEAK_DEBUG |
2d2ae547 CM |
141 | spin_lock_irqsave(&leak_lock, flags); |
142 | list_add(&state->leak_list, &states); | |
143 | spin_unlock_irqrestore(&leak_lock, flags); | |
4bef0848 | 144 | #endif |
d1310b2e CM |
145 | atomic_set(&state->refs, 1); |
146 | init_waitqueue_head(&state->wq); | |
143bede5 | 147 | trace_alloc_extent_state(state, mask, _RET_IP_); |
d1310b2e CM |
148 | return state; |
149 | } | |
d1310b2e | 150 | |
4845e44f | 151 | void free_extent_state(struct extent_state *state) |
d1310b2e | 152 | { |
d1310b2e CM |
153 | if (!state) |
154 | return; | |
155 | if (atomic_dec_and_test(&state->refs)) { | |
3935127c | 156 | #if LEAK_DEBUG |
2d2ae547 | 157 | unsigned long flags; |
4bef0848 | 158 | #endif |
70dec807 | 159 | WARN_ON(state->tree); |
3935127c | 160 | #if LEAK_DEBUG |
2d2ae547 CM |
161 | spin_lock_irqsave(&leak_lock, flags); |
162 | list_del(&state->leak_list); | |
163 | spin_unlock_irqrestore(&leak_lock, flags); | |
4bef0848 | 164 | #endif |
143bede5 | 165 | trace_free_extent_state(state, _RET_IP_); |
d1310b2e CM |
166 | kmem_cache_free(extent_state_cache, state); |
167 | } | |
168 | } | |
d1310b2e CM |
169 | |
170 | static struct rb_node *tree_insert(struct rb_root *root, u64 offset, | |
171 | struct rb_node *node) | |
172 | { | |
d397712b CM |
173 | struct rb_node **p = &root->rb_node; |
174 | struct rb_node *parent = NULL; | |
d1310b2e CM |
175 | struct tree_entry *entry; |
176 | ||
d397712b | 177 | while (*p) { |
d1310b2e CM |
178 | parent = *p; |
179 | entry = rb_entry(parent, struct tree_entry, rb_node); | |
180 | ||
181 | if (offset < entry->start) | |
182 | p = &(*p)->rb_left; | |
183 | else if (offset > entry->end) | |
184 | p = &(*p)->rb_right; | |
185 | else | |
186 | return parent; | |
187 | } | |
188 | ||
189 | entry = rb_entry(node, struct tree_entry, rb_node); | |
d1310b2e CM |
190 | rb_link_node(node, parent, p); |
191 | rb_insert_color(node, root); | |
192 | return NULL; | |
193 | } | |
194 | ||
80ea96b1 | 195 | static struct rb_node *__etree_search(struct extent_io_tree *tree, u64 offset, |
d1310b2e CM |
196 | struct rb_node **prev_ret, |
197 | struct rb_node **next_ret) | |
198 | { | |
80ea96b1 | 199 | struct rb_root *root = &tree->state; |
d397712b | 200 | struct rb_node *n = root->rb_node; |
d1310b2e CM |
201 | struct rb_node *prev = NULL; |
202 | struct rb_node *orig_prev = NULL; | |
203 | struct tree_entry *entry; | |
204 | struct tree_entry *prev_entry = NULL; | |
205 | ||
d397712b | 206 | while (n) { |
d1310b2e CM |
207 | entry = rb_entry(n, struct tree_entry, rb_node); |
208 | prev = n; | |
209 | prev_entry = entry; | |
210 | ||
211 | if (offset < entry->start) | |
212 | n = n->rb_left; | |
213 | else if (offset > entry->end) | |
214 | n = n->rb_right; | |
d397712b | 215 | else |
d1310b2e CM |
216 | return n; |
217 | } | |
218 | ||
219 | if (prev_ret) { | |
220 | orig_prev = prev; | |
d397712b | 221 | while (prev && offset > prev_entry->end) { |
d1310b2e CM |
222 | prev = rb_next(prev); |
223 | prev_entry = rb_entry(prev, struct tree_entry, rb_node); | |
224 | } | |
225 | *prev_ret = prev; | |
226 | prev = orig_prev; | |
227 | } | |
228 | ||
229 | if (next_ret) { | |
230 | prev_entry = rb_entry(prev, struct tree_entry, rb_node); | |
d397712b | 231 | while (prev && offset < prev_entry->start) { |
d1310b2e CM |
232 | prev = rb_prev(prev); |
233 | prev_entry = rb_entry(prev, struct tree_entry, rb_node); | |
234 | } | |
235 | *next_ret = prev; | |
236 | } | |
237 | return NULL; | |
238 | } | |
239 | ||
80ea96b1 CM |
240 | static inline struct rb_node *tree_search(struct extent_io_tree *tree, |
241 | u64 offset) | |
d1310b2e | 242 | { |
70dec807 | 243 | struct rb_node *prev = NULL; |
d1310b2e | 244 | struct rb_node *ret; |
70dec807 | 245 | |
80ea96b1 | 246 | ret = __etree_search(tree, offset, &prev, NULL); |
d397712b | 247 | if (!ret) |
d1310b2e CM |
248 | return prev; |
249 | return ret; | |
250 | } | |
251 | ||
9ed74f2d JB |
252 | static void merge_cb(struct extent_io_tree *tree, struct extent_state *new, |
253 | struct extent_state *other) | |
254 | { | |
255 | if (tree->ops && tree->ops->merge_extent_hook) | |
256 | tree->ops->merge_extent_hook(tree->mapping->host, new, | |
257 | other); | |
258 | } | |
259 | ||
d1310b2e CM |
260 | /* |
261 | * utility function to look for merge candidates inside a given range. | |
262 | * Any extents with matching state are merged together into a single | |
263 | * extent in the tree. Extents with EXTENT_IO in their state field | |
264 | * are not merged because the end_io handlers need to be able to do | |
265 | * operations on them without sleeping (or doing allocations/splits). | |
266 | * | |
267 | * This should be called with the tree lock held. | |
268 | */ | |
1bf85046 JM |
269 | static void merge_state(struct extent_io_tree *tree, |
270 | struct extent_state *state) | |
d1310b2e CM |
271 | { |
272 | struct extent_state *other; | |
273 | struct rb_node *other_node; | |
274 | ||
5b21f2ed | 275 | if (state->state & (EXTENT_IOBITS | EXTENT_BOUNDARY)) |
1bf85046 | 276 | return; |
d1310b2e CM |
277 | |
278 | other_node = rb_prev(&state->rb_node); | |
279 | if (other_node) { | |
280 | other = rb_entry(other_node, struct extent_state, rb_node); | |
281 | if (other->end == state->start - 1 && | |
282 | other->state == state->state) { | |
9ed74f2d | 283 | merge_cb(tree, state, other); |
d1310b2e | 284 | state->start = other->start; |
70dec807 | 285 | other->tree = NULL; |
d1310b2e CM |
286 | rb_erase(&other->rb_node, &tree->state); |
287 | free_extent_state(other); | |
288 | } | |
289 | } | |
290 | other_node = rb_next(&state->rb_node); | |
291 | if (other_node) { | |
292 | other = rb_entry(other_node, struct extent_state, rb_node); | |
293 | if (other->start == state->end + 1 && | |
294 | other->state == state->state) { | |
9ed74f2d | 295 | merge_cb(tree, state, other); |
df98b6e2 JB |
296 | state->end = other->end; |
297 | other->tree = NULL; | |
298 | rb_erase(&other->rb_node, &tree->state); | |
299 | free_extent_state(other); | |
d1310b2e CM |
300 | } |
301 | } | |
d1310b2e CM |
302 | } |
303 | ||
1bf85046 | 304 | static void set_state_cb(struct extent_io_tree *tree, |
0ca1f7ce | 305 | struct extent_state *state, int *bits) |
291d673e | 306 | { |
1bf85046 JM |
307 | if (tree->ops && tree->ops->set_bit_hook) |
308 | tree->ops->set_bit_hook(tree->mapping->host, state, bits); | |
291d673e CM |
309 | } |
310 | ||
311 | static void clear_state_cb(struct extent_io_tree *tree, | |
0ca1f7ce | 312 | struct extent_state *state, int *bits) |
291d673e | 313 | { |
9ed74f2d JB |
314 | if (tree->ops && tree->ops->clear_bit_hook) |
315 | tree->ops->clear_bit_hook(tree->mapping->host, state, bits); | |
291d673e CM |
316 | } |
317 | ||
3150b699 XG |
318 | static void set_state_bits(struct extent_io_tree *tree, |
319 | struct extent_state *state, int *bits); | |
320 | ||
d1310b2e CM |
321 | /* |
322 | * insert an extent_state struct into the tree. 'bits' are set on the | |
323 | * struct before it is inserted. | |
324 | * | |
325 | * This may return -EEXIST if the extent is already there, in which case the | |
326 | * state struct is freed. | |
327 | * | |
328 | * The tree lock is not taken internally. This is a utility function and | |
329 | * probably isn't what you want to call (see set/clear_extent_bit). | |
330 | */ | |
331 | static int insert_state(struct extent_io_tree *tree, | |
332 | struct extent_state *state, u64 start, u64 end, | |
0ca1f7ce | 333 | int *bits) |
d1310b2e CM |
334 | { |
335 | struct rb_node *node; | |
336 | ||
337 | if (end < start) { | |
d397712b CM |
338 | printk(KERN_ERR "btrfs end < start %llu %llu\n", |
339 | (unsigned long long)end, | |
340 | (unsigned long long)start); | |
d1310b2e CM |
341 | WARN_ON(1); |
342 | } | |
d1310b2e CM |
343 | state->start = start; |
344 | state->end = end; | |
9ed74f2d | 345 | |
3150b699 XG |
346 | set_state_bits(tree, state, bits); |
347 | ||
d1310b2e CM |
348 | node = tree_insert(&tree->state, end, &state->rb_node); |
349 | if (node) { | |
350 | struct extent_state *found; | |
351 | found = rb_entry(node, struct extent_state, rb_node); | |
d397712b CM |
352 | printk(KERN_ERR "btrfs found node %llu %llu on insert of " |
353 | "%llu %llu\n", (unsigned long long)found->start, | |
354 | (unsigned long long)found->end, | |
355 | (unsigned long long)start, (unsigned long long)end); | |
d1310b2e CM |
356 | return -EEXIST; |
357 | } | |
70dec807 | 358 | state->tree = tree; |
d1310b2e CM |
359 | merge_state(tree, state); |
360 | return 0; | |
361 | } | |
362 | ||
1bf85046 | 363 | static void split_cb(struct extent_io_tree *tree, struct extent_state *orig, |
9ed74f2d JB |
364 | u64 split) |
365 | { | |
366 | if (tree->ops && tree->ops->split_extent_hook) | |
1bf85046 | 367 | tree->ops->split_extent_hook(tree->mapping->host, orig, split); |
9ed74f2d JB |
368 | } |
369 | ||
d1310b2e CM |
370 | /* |
371 | * split a given extent state struct in two, inserting the preallocated | |
372 | * struct 'prealloc' as the newly created second half. 'split' indicates an | |
373 | * offset inside 'orig' where it should be split. | |
374 | * | |
375 | * Before calling, | |
376 | * the tree has 'orig' at [orig->start, orig->end]. After calling, there | |
377 | * are two extent state structs in the tree: | |
378 | * prealloc: [orig->start, split - 1] | |
379 | * orig: [ split, orig->end ] | |
380 | * | |
381 | * The tree locks are not taken by this function. They need to be held | |
382 | * by the caller. | |
383 | */ | |
384 | static int split_state(struct extent_io_tree *tree, struct extent_state *orig, | |
385 | struct extent_state *prealloc, u64 split) | |
386 | { | |
387 | struct rb_node *node; | |
9ed74f2d JB |
388 | |
389 | split_cb(tree, orig, split); | |
390 | ||
d1310b2e CM |
391 | prealloc->start = orig->start; |
392 | prealloc->end = split - 1; | |
393 | prealloc->state = orig->state; | |
394 | orig->start = split; | |
395 | ||
396 | node = tree_insert(&tree->state, prealloc->end, &prealloc->rb_node); | |
397 | if (node) { | |
d1310b2e CM |
398 | free_extent_state(prealloc); |
399 | return -EEXIST; | |
400 | } | |
70dec807 | 401 | prealloc->tree = tree; |
d1310b2e CM |
402 | return 0; |
403 | } | |
404 | ||
cdc6a395 LZ |
405 | static struct extent_state *next_state(struct extent_state *state) |
406 | { | |
407 | struct rb_node *next = rb_next(&state->rb_node); | |
408 | if (next) | |
409 | return rb_entry(next, struct extent_state, rb_node); | |
410 | else | |
411 | return NULL; | |
412 | } | |
413 | ||
d1310b2e CM |
414 | /* |
415 | * utility function to clear some bits in an extent state struct. | |
8e52acf7 | 416 | * it will optionally wake up any one waiting on this state (wake == 1) |
d1310b2e CM |
417 | * |
418 | * If no bits are set on the state struct after clearing things, the | |
419 | * struct is freed and removed from the tree | |
420 | */ | |
cdc6a395 LZ |
421 | static struct extent_state *clear_state_bit(struct extent_io_tree *tree, |
422 | struct extent_state *state, | |
423 | int *bits, int wake) | |
d1310b2e | 424 | { |
cdc6a395 | 425 | struct extent_state *next; |
0ca1f7ce | 426 | int bits_to_clear = *bits & ~EXTENT_CTLBITS; |
d1310b2e | 427 | |
0ca1f7ce | 428 | if ((bits_to_clear & EXTENT_DIRTY) && (state->state & EXTENT_DIRTY)) { |
d1310b2e CM |
429 | u64 range = state->end - state->start + 1; |
430 | WARN_ON(range > tree->dirty_bytes); | |
431 | tree->dirty_bytes -= range; | |
432 | } | |
291d673e | 433 | clear_state_cb(tree, state, bits); |
32c00aff | 434 | state->state &= ~bits_to_clear; |
d1310b2e CM |
435 | if (wake) |
436 | wake_up(&state->wq); | |
0ca1f7ce | 437 | if (state->state == 0) { |
cdc6a395 | 438 | next = next_state(state); |
70dec807 | 439 | if (state->tree) { |
d1310b2e | 440 | rb_erase(&state->rb_node, &tree->state); |
70dec807 | 441 | state->tree = NULL; |
d1310b2e CM |
442 | free_extent_state(state); |
443 | } else { | |
444 | WARN_ON(1); | |
445 | } | |
446 | } else { | |
447 | merge_state(tree, state); | |
cdc6a395 | 448 | next = next_state(state); |
d1310b2e | 449 | } |
cdc6a395 | 450 | return next; |
d1310b2e CM |
451 | } |
452 | ||
8233767a XG |
453 | static struct extent_state * |
454 | alloc_extent_state_atomic(struct extent_state *prealloc) | |
455 | { | |
456 | if (!prealloc) | |
457 | prealloc = alloc_extent_state(GFP_ATOMIC); | |
458 | ||
459 | return prealloc; | |
460 | } | |
461 | ||
c2d904e0 JM |
462 | void extent_io_tree_panic(struct extent_io_tree *tree, int err) |
463 | { | |
464 | btrfs_panic(tree_fs_info(tree), err, "Locking error: " | |
465 | "Extent tree was modified by another " | |
466 | "thread while locked."); | |
467 | } | |
468 | ||
d1310b2e CM |
469 | /* |
470 | * clear some bits on a range in the tree. This may require splitting | |
471 | * or inserting elements in the tree, so the gfp mask is used to | |
472 | * indicate which allocations or sleeping are allowed. | |
473 | * | |
474 | * pass 'wake' == 1 to kick any sleepers, and 'delete' == 1 to remove | |
475 | * the given range from the tree regardless of state (ie for truncate). | |
476 | * | |
477 | * the range [start, end] is inclusive. | |
478 | * | |
6763af84 | 479 | * This takes the tree lock, and returns 0 on success and < 0 on error. |
d1310b2e CM |
480 | */ |
481 | int clear_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, | |
2c64c53d CM |
482 | int bits, int wake, int delete, |
483 | struct extent_state **cached_state, | |
484 | gfp_t mask) | |
d1310b2e CM |
485 | { |
486 | struct extent_state *state; | |
2c64c53d | 487 | struct extent_state *cached; |
d1310b2e CM |
488 | struct extent_state *prealloc = NULL; |
489 | struct rb_node *node; | |
5c939df5 | 490 | u64 last_end; |
d1310b2e | 491 | int err; |
2ac55d41 | 492 | int clear = 0; |
d1310b2e | 493 | |
0ca1f7ce YZ |
494 | if (delete) |
495 | bits |= ~EXTENT_CTLBITS; | |
496 | bits |= EXTENT_FIRST_DELALLOC; | |
497 | ||
2ac55d41 JB |
498 | if (bits & (EXTENT_IOBITS | EXTENT_BOUNDARY)) |
499 | clear = 1; | |
d1310b2e CM |
500 | again: |
501 | if (!prealloc && (mask & __GFP_WAIT)) { | |
502 | prealloc = alloc_extent_state(mask); | |
503 | if (!prealloc) | |
504 | return -ENOMEM; | |
505 | } | |
506 | ||
cad321ad | 507 | spin_lock(&tree->lock); |
2c64c53d CM |
508 | if (cached_state) { |
509 | cached = *cached_state; | |
2ac55d41 JB |
510 | |
511 | if (clear) { | |
512 | *cached_state = NULL; | |
513 | cached_state = NULL; | |
514 | } | |
515 | ||
df98b6e2 JB |
516 | if (cached && cached->tree && cached->start <= start && |
517 | cached->end > start) { | |
2ac55d41 JB |
518 | if (clear) |
519 | atomic_dec(&cached->refs); | |
2c64c53d | 520 | state = cached; |
42daec29 | 521 | goto hit_next; |
2c64c53d | 522 | } |
2ac55d41 JB |
523 | if (clear) |
524 | free_extent_state(cached); | |
2c64c53d | 525 | } |
d1310b2e CM |
526 | /* |
527 | * this search will find the extents that end after | |
528 | * our range starts | |
529 | */ | |
80ea96b1 | 530 | node = tree_search(tree, start); |
d1310b2e CM |
531 | if (!node) |
532 | goto out; | |
533 | state = rb_entry(node, struct extent_state, rb_node); | |
2c64c53d | 534 | hit_next: |
d1310b2e CM |
535 | if (state->start > end) |
536 | goto out; | |
537 | WARN_ON(state->end < start); | |
5c939df5 | 538 | last_end = state->end; |
d1310b2e | 539 | |
0449314a | 540 | /* the state doesn't have the wanted bits, go ahead */ |
cdc6a395 LZ |
541 | if (!(state->state & bits)) { |
542 | state = next_state(state); | |
0449314a | 543 | goto next; |
cdc6a395 | 544 | } |
0449314a | 545 | |
d1310b2e CM |
546 | /* |
547 | * | ---- desired range ---- | | |
548 | * | state | or | |
549 | * | ------------- state -------------- | | |
550 | * | |
551 | * We need to split the extent we found, and may flip | |
552 | * bits on second half. | |
553 | * | |
554 | * If the extent we found extends past our range, we | |
555 | * just split and search again. It'll get split again | |
556 | * the next time though. | |
557 | * | |
558 | * If the extent we found is inside our range, we clear | |
559 | * the desired bit on it. | |
560 | */ | |
561 | ||
562 | if (state->start < start) { | |
8233767a XG |
563 | prealloc = alloc_extent_state_atomic(prealloc); |
564 | BUG_ON(!prealloc); | |
d1310b2e | 565 | err = split_state(tree, state, prealloc, start); |
c2d904e0 JM |
566 | if (err) |
567 | extent_io_tree_panic(tree, err); | |
568 | ||
d1310b2e CM |
569 | prealloc = NULL; |
570 | if (err) | |
571 | goto out; | |
572 | if (state->end <= end) { | |
6763af84 | 573 | clear_state_bit(tree, state, &bits, wake); |
5c939df5 YZ |
574 | if (last_end == (u64)-1) |
575 | goto out; | |
576 | start = last_end + 1; | |
d1310b2e CM |
577 | } |
578 | goto search_again; | |
579 | } | |
580 | /* | |
581 | * | ---- desired range ---- | | |
582 | * | state | | |
583 | * We need to split the extent, and clear the bit | |
584 | * on the first half | |
585 | */ | |
586 | if (state->start <= end && state->end > end) { | |
8233767a XG |
587 | prealloc = alloc_extent_state_atomic(prealloc); |
588 | BUG_ON(!prealloc); | |
d1310b2e | 589 | err = split_state(tree, state, prealloc, end + 1); |
c2d904e0 JM |
590 | if (err) |
591 | extent_io_tree_panic(tree, err); | |
592 | ||
d1310b2e CM |
593 | if (wake) |
594 | wake_up(&state->wq); | |
42daec29 | 595 | |
6763af84 | 596 | clear_state_bit(tree, prealloc, &bits, wake); |
9ed74f2d | 597 | |
d1310b2e CM |
598 | prealloc = NULL; |
599 | goto out; | |
600 | } | |
42daec29 | 601 | |
cdc6a395 | 602 | state = clear_state_bit(tree, state, &bits, wake); |
0449314a | 603 | next: |
5c939df5 YZ |
604 | if (last_end == (u64)-1) |
605 | goto out; | |
606 | start = last_end + 1; | |
cdc6a395 | 607 | if (start <= end && state && !need_resched()) |
692e5759 | 608 | goto hit_next; |
d1310b2e CM |
609 | goto search_again; |
610 | ||
611 | out: | |
cad321ad | 612 | spin_unlock(&tree->lock); |
d1310b2e CM |
613 | if (prealloc) |
614 | free_extent_state(prealloc); | |
615 | ||
6763af84 | 616 | return 0; |
d1310b2e CM |
617 | |
618 | search_again: | |
619 | if (start > end) | |
620 | goto out; | |
cad321ad | 621 | spin_unlock(&tree->lock); |
d1310b2e CM |
622 | if (mask & __GFP_WAIT) |
623 | cond_resched(); | |
624 | goto again; | |
625 | } | |
d1310b2e | 626 | |
143bede5 JM |
627 | static void wait_on_state(struct extent_io_tree *tree, |
628 | struct extent_state *state) | |
641f5219 CH |
629 | __releases(tree->lock) |
630 | __acquires(tree->lock) | |
d1310b2e CM |
631 | { |
632 | DEFINE_WAIT(wait); | |
633 | prepare_to_wait(&state->wq, &wait, TASK_UNINTERRUPTIBLE); | |
cad321ad | 634 | spin_unlock(&tree->lock); |
d1310b2e | 635 | schedule(); |
cad321ad | 636 | spin_lock(&tree->lock); |
d1310b2e | 637 | finish_wait(&state->wq, &wait); |
d1310b2e CM |
638 | } |
639 | ||
640 | /* | |
641 | * waits for one or more bits to clear on a range in the state tree. | |
642 | * The range [start, end] is inclusive. | |
643 | * The tree lock is taken by this function | |
644 | */ | |
143bede5 | 645 | void wait_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, int bits) |
d1310b2e CM |
646 | { |
647 | struct extent_state *state; | |
648 | struct rb_node *node; | |
649 | ||
cad321ad | 650 | spin_lock(&tree->lock); |
d1310b2e CM |
651 | again: |
652 | while (1) { | |
653 | /* | |
654 | * this search will find all the extents that end after | |
655 | * our range starts | |
656 | */ | |
80ea96b1 | 657 | node = tree_search(tree, start); |
d1310b2e CM |
658 | if (!node) |
659 | break; | |
660 | ||
661 | state = rb_entry(node, struct extent_state, rb_node); | |
662 | ||
663 | if (state->start > end) | |
664 | goto out; | |
665 | ||
666 | if (state->state & bits) { | |
667 | start = state->start; | |
668 | atomic_inc(&state->refs); | |
669 | wait_on_state(tree, state); | |
670 | free_extent_state(state); | |
671 | goto again; | |
672 | } | |
673 | start = state->end + 1; | |
674 | ||
675 | if (start > end) | |
676 | break; | |
677 | ||
ded91f08 | 678 | cond_resched_lock(&tree->lock); |
d1310b2e CM |
679 | } |
680 | out: | |
cad321ad | 681 | spin_unlock(&tree->lock); |
d1310b2e | 682 | } |
d1310b2e | 683 | |
1bf85046 | 684 | static void set_state_bits(struct extent_io_tree *tree, |
d1310b2e | 685 | struct extent_state *state, |
0ca1f7ce | 686 | int *bits) |
d1310b2e | 687 | { |
0ca1f7ce | 688 | int bits_to_set = *bits & ~EXTENT_CTLBITS; |
9ed74f2d | 689 | |
1bf85046 | 690 | set_state_cb(tree, state, bits); |
0ca1f7ce | 691 | if ((bits_to_set & EXTENT_DIRTY) && !(state->state & EXTENT_DIRTY)) { |
d1310b2e CM |
692 | u64 range = state->end - state->start + 1; |
693 | tree->dirty_bytes += range; | |
694 | } | |
0ca1f7ce | 695 | state->state |= bits_to_set; |
d1310b2e CM |
696 | } |
697 | ||
2c64c53d CM |
698 | static void cache_state(struct extent_state *state, |
699 | struct extent_state **cached_ptr) | |
700 | { | |
701 | if (cached_ptr && !(*cached_ptr)) { | |
702 | if (state->state & (EXTENT_IOBITS | EXTENT_BOUNDARY)) { | |
703 | *cached_ptr = state; | |
704 | atomic_inc(&state->refs); | |
705 | } | |
706 | } | |
707 | } | |
708 | ||
507903b8 AJ |
709 | static void uncache_state(struct extent_state **cached_ptr) |
710 | { | |
711 | if (cached_ptr && (*cached_ptr)) { | |
712 | struct extent_state *state = *cached_ptr; | |
109b36a2 CM |
713 | *cached_ptr = NULL; |
714 | free_extent_state(state); | |
507903b8 AJ |
715 | } |
716 | } | |
717 | ||
d1310b2e | 718 | /* |
1edbb734 CM |
719 | * set some bits on a range in the tree. This may require allocations or |
720 | * sleeping, so the gfp mask is used to indicate what is allowed. | |
d1310b2e | 721 | * |
1edbb734 CM |
722 | * If any of the exclusive bits are set, this will fail with -EEXIST if some |
723 | * part of the range already has the desired bits set. The start of the | |
724 | * existing range is returned in failed_start in this case. | |
d1310b2e | 725 | * |
1edbb734 | 726 | * [start, end] is inclusive This takes the tree lock. |
d1310b2e | 727 | */ |
1edbb734 | 728 | |
3fbe5c02 JM |
729 | static int __must_check |
730 | __set_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, | |
731 | int bits, int exclusive_bits, u64 *failed_start, | |
732 | struct extent_state **cached_state, gfp_t mask) | |
d1310b2e CM |
733 | { |
734 | struct extent_state *state; | |
735 | struct extent_state *prealloc = NULL; | |
736 | struct rb_node *node; | |
d1310b2e | 737 | int err = 0; |
d1310b2e CM |
738 | u64 last_start; |
739 | u64 last_end; | |
42daec29 | 740 | |
0ca1f7ce | 741 | bits |= EXTENT_FIRST_DELALLOC; |
d1310b2e CM |
742 | again: |
743 | if (!prealloc && (mask & __GFP_WAIT)) { | |
744 | prealloc = alloc_extent_state(mask); | |
8233767a | 745 | BUG_ON(!prealloc); |
d1310b2e CM |
746 | } |
747 | ||
cad321ad | 748 | spin_lock(&tree->lock); |
9655d298 CM |
749 | if (cached_state && *cached_state) { |
750 | state = *cached_state; | |
df98b6e2 JB |
751 | if (state->start <= start && state->end > start && |
752 | state->tree) { | |
9655d298 CM |
753 | node = &state->rb_node; |
754 | goto hit_next; | |
755 | } | |
756 | } | |
d1310b2e CM |
757 | /* |
758 | * this search will find all the extents that end after | |
759 | * our range starts. | |
760 | */ | |
80ea96b1 | 761 | node = tree_search(tree, start); |
d1310b2e | 762 | if (!node) { |
8233767a XG |
763 | prealloc = alloc_extent_state_atomic(prealloc); |
764 | BUG_ON(!prealloc); | |
0ca1f7ce | 765 | err = insert_state(tree, prealloc, start, end, &bits); |
c2d904e0 JM |
766 | if (err) |
767 | extent_io_tree_panic(tree, err); | |
768 | ||
d1310b2e | 769 | prealloc = NULL; |
d1310b2e CM |
770 | goto out; |
771 | } | |
d1310b2e | 772 | state = rb_entry(node, struct extent_state, rb_node); |
40431d6c | 773 | hit_next: |
d1310b2e CM |
774 | last_start = state->start; |
775 | last_end = state->end; | |
776 | ||
777 | /* | |
778 | * | ---- desired range ---- | | |
779 | * | state | | |
780 | * | |
781 | * Just lock what we found and keep going | |
782 | */ | |
783 | if (state->start == start && state->end <= end) { | |
40431d6c | 784 | struct rb_node *next_node; |
1edbb734 | 785 | if (state->state & exclusive_bits) { |
d1310b2e CM |
786 | *failed_start = state->start; |
787 | err = -EEXIST; | |
788 | goto out; | |
789 | } | |
42daec29 | 790 | |
1bf85046 | 791 | set_state_bits(tree, state, &bits); |
9ed74f2d | 792 | |
2c64c53d | 793 | cache_state(state, cached_state); |
d1310b2e | 794 | merge_state(tree, state); |
5c939df5 YZ |
795 | if (last_end == (u64)-1) |
796 | goto out; | |
40431d6c | 797 | |
5c939df5 | 798 | start = last_end + 1; |
df98b6e2 | 799 | next_node = rb_next(&state->rb_node); |
c7f895a2 XG |
800 | if (next_node && start < end && prealloc && !need_resched()) { |
801 | state = rb_entry(next_node, struct extent_state, | |
802 | rb_node); | |
803 | if (state->start == start) | |
804 | goto hit_next; | |
40431d6c | 805 | } |
d1310b2e CM |
806 | goto search_again; |
807 | } | |
808 | ||
809 | /* | |
810 | * | ---- desired range ---- | | |
811 | * | state | | |
812 | * or | |
813 | * | ------------- state -------------- | | |
814 | * | |
815 | * We need to split the extent we found, and may flip bits on | |
816 | * second half. | |
817 | * | |
818 | * If the extent we found extends past our | |
819 | * range, we just split and search again. It'll get split | |
820 | * again the next time though. | |
821 | * | |
822 | * If the extent we found is inside our range, we set the | |
823 | * desired bit on it. | |
824 | */ | |
825 | if (state->start < start) { | |
1edbb734 | 826 | if (state->state & exclusive_bits) { |
d1310b2e CM |
827 | *failed_start = start; |
828 | err = -EEXIST; | |
829 | goto out; | |
830 | } | |
8233767a XG |
831 | |
832 | prealloc = alloc_extent_state_atomic(prealloc); | |
833 | BUG_ON(!prealloc); | |
d1310b2e | 834 | err = split_state(tree, state, prealloc, start); |
c2d904e0 JM |
835 | if (err) |
836 | extent_io_tree_panic(tree, err); | |
837 | ||
d1310b2e CM |
838 | prealloc = NULL; |
839 | if (err) | |
840 | goto out; | |
841 | if (state->end <= end) { | |
1bf85046 | 842 | set_state_bits(tree, state, &bits); |
2c64c53d | 843 | cache_state(state, cached_state); |
d1310b2e | 844 | merge_state(tree, state); |
5c939df5 YZ |
845 | if (last_end == (u64)-1) |
846 | goto out; | |
847 | start = last_end + 1; | |
d1310b2e CM |
848 | } |
849 | goto search_again; | |
850 | } | |
851 | /* | |
852 | * | ---- desired range ---- | | |
853 | * | state | or | state | | |
854 | * | |
855 | * There's a hole, we need to insert something in it and | |
856 | * ignore the extent we found. | |
857 | */ | |
858 | if (state->start > start) { | |
859 | u64 this_end; | |
860 | if (end < last_start) | |
861 | this_end = end; | |
862 | else | |
d397712b | 863 | this_end = last_start - 1; |
8233767a XG |
864 | |
865 | prealloc = alloc_extent_state_atomic(prealloc); | |
866 | BUG_ON(!prealloc); | |
c7f895a2 XG |
867 | |
868 | /* | |
869 | * Avoid to free 'prealloc' if it can be merged with | |
870 | * the later extent. | |
871 | */ | |
d1310b2e | 872 | err = insert_state(tree, prealloc, start, this_end, |
0ca1f7ce | 873 | &bits); |
c2d904e0 JM |
874 | if (err) |
875 | extent_io_tree_panic(tree, err); | |
876 | ||
9ed74f2d JB |
877 | cache_state(prealloc, cached_state); |
878 | prealloc = NULL; | |
d1310b2e CM |
879 | start = this_end + 1; |
880 | goto search_again; | |
881 | } | |
882 | /* | |
883 | * | ---- desired range ---- | | |
884 | * | state | | |
885 | * We need to split the extent, and set the bit | |
886 | * on the first half | |
887 | */ | |
888 | if (state->start <= end && state->end > end) { | |
1edbb734 | 889 | if (state->state & exclusive_bits) { |
d1310b2e CM |
890 | *failed_start = start; |
891 | err = -EEXIST; | |
892 | goto out; | |
893 | } | |
8233767a XG |
894 | |
895 | prealloc = alloc_extent_state_atomic(prealloc); | |
896 | BUG_ON(!prealloc); | |
d1310b2e | 897 | err = split_state(tree, state, prealloc, end + 1); |
c2d904e0 JM |
898 | if (err) |
899 | extent_io_tree_panic(tree, err); | |
d1310b2e | 900 | |
1bf85046 | 901 | set_state_bits(tree, prealloc, &bits); |
2c64c53d | 902 | cache_state(prealloc, cached_state); |
d1310b2e CM |
903 | merge_state(tree, prealloc); |
904 | prealloc = NULL; | |
905 | goto out; | |
906 | } | |
907 | ||
908 | goto search_again; | |
909 | ||
910 | out: | |
cad321ad | 911 | spin_unlock(&tree->lock); |
d1310b2e CM |
912 | if (prealloc) |
913 | free_extent_state(prealloc); | |
914 | ||
915 | return err; | |
916 | ||
917 | search_again: | |
918 | if (start > end) | |
919 | goto out; | |
cad321ad | 920 | spin_unlock(&tree->lock); |
d1310b2e CM |
921 | if (mask & __GFP_WAIT) |
922 | cond_resched(); | |
923 | goto again; | |
924 | } | |
d1310b2e | 925 | |
3fbe5c02 JM |
926 | int set_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, int bits, |
927 | u64 *failed_start, struct extent_state **cached_state, | |
928 | gfp_t mask) | |
929 | { | |
930 | return __set_extent_bit(tree, start, end, bits, 0, failed_start, | |
931 | cached_state, mask); | |
932 | } | |
933 | ||
934 | ||
462d6fac JB |
935 | /** |
936 | * convert_extent - convert all bits in a given range from one bit to another | |
937 | * @tree: the io tree to search | |
938 | * @start: the start offset in bytes | |
939 | * @end: the end offset in bytes (inclusive) | |
940 | * @bits: the bits to set in this range | |
941 | * @clear_bits: the bits to clear in this range | |
942 | * @mask: the allocation mask | |
943 | * | |
944 | * This will go through and set bits for the given range. If any states exist | |
945 | * already in this range they are set with the given bit and cleared of the | |
946 | * clear_bits. This is only meant to be used by things that are mergeable, ie | |
947 | * converting from say DELALLOC to DIRTY. This is not meant to be used with | |
948 | * boundary bits like LOCK. | |
949 | */ | |
950 | int convert_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, | |
951 | int bits, int clear_bits, gfp_t mask) | |
952 | { | |
953 | struct extent_state *state; | |
954 | struct extent_state *prealloc = NULL; | |
955 | struct rb_node *node; | |
956 | int err = 0; | |
957 | u64 last_start; | |
958 | u64 last_end; | |
959 | ||
960 | again: | |
961 | if (!prealloc && (mask & __GFP_WAIT)) { | |
962 | prealloc = alloc_extent_state(mask); | |
963 | if (!prealloc) | |
964 | return -ENOMEM; | |
965 | } | |
966 | ||
967 | spin_lock(&tree->lock); | |
968 | /* | |
969 | * this search will find all the extents that end after | |
970 | * our range starts. | |
971 | */ | |
972 | node = tree_search(tree, start); | |
973 | if (!node) { | |
974 | prealloc = alloc_extent_state_atomic(prealloc); | |
1cf4ffdb LB |
975 | if (!prealloc) { |
976 | err = -ENOMEM; | |
977 | goto out; | |
978 | } | |
462d6fac JB |
979 | err = insert_state(tree, prealloc, start, end, &bits); |
980 | prealloc = NULL; | |
c2d904e0 JM |
981 | if (err) |
982 | extent_io_tree_panic(tree, err); | |
462d6fac JB |
983 | goto out; |
984 | } | |
985 | state = rb_entry(node, struct extent_state, rb_node); | |
986 | hit_next: | |
987 | last_start = state->start; | |
988 | last_end = state->end; | |
989 | ||
990 | /* | |
991 | * | ---- desired range ---- | | |
992 | * | state | | |
993 | * | |
994 | * Just lock what we found and keep going | |
995 | */ | |
996 | if (state->start == start && state->end <= end) { | |
997 | struct rb_node *next_node; | |
998 | ||
999 | set_state_bits(tree, state, &bits); | |
1000 | clear_state_bit(tree, state, &clear_bits, 0); | |
462d6fac JB |
1001 | if (last_end == (u64)-1) |
1002 | goto out; | |
1003 | ||
1004 | start = last_end + 1; | |
1005 | next_node = rb_next(&state->rb_node); | |
1006 | if (next_node && start < end && prealloc && !need_resched()) { | |
1007 | state = rb_entry(next_node, struct extent_state, | |
1008 | rb_node); | |
1009 | if (state->start == start) | |
1010 | goto hit_next; | |
1011 | } | |
1012 | goto search_again; | |
1013 | } | |
1014 | ||
1015 | /* | |
1016 | * | ---- desired range ---- | | |
1017 | * | state | | |
1018 | * or | |
1019 | * | ------------- state -------------- | | |
1020 | * | |
1021 | * We need to split the extent we found, and may flip bits on | |
1022 | * second half. | |
1023 | * | |
1024 | * If the extent we found extends past our | |
1025 | * range, we just split and search again. It'll get split | |
1026 | * again the next time though. | |
1027 | * | |
1028 | * If the extent we found is inside our range, we set the | |
1029 | * desired bit on it. | |
1030 | */ | |
1031 | if (state->start < start) { | |
1032 | prealloc = alloc_extent_state_atomic(prealloc); | |
1cf4ffdb LB |
1033 | if (!prealloc) { |
1034 | err = -ENOMEM; | |
1035 | goto out; | |
1036 | } | |
462d6fac | 1037 | err = split_state(tree, state, prealloc, start); |
c2d904e0 JM |
1038 | if (err) |
1039 | extent_io_tree_panic(tree, err); | |
462d6fac JB |
1040 | prealloc = NULL; |
1041 | if (err) | |
1042 | goto out; | |
1043 | if (state->end <= end) { | |
1044 | set_state_bits(tree, state, &bits); | |
1045 | clear_state_bit(tree, state, &clear_bits, 0); | |
462d6fac JB |
1046 | if (last_end == (u64)-1) |
1047 | goto out; | |
1048 | start = last_end + 1; | |
1049 | } | |
1050 | goto search_again; | |
1051 | } | |
1052 | /* | |
1053 | * | ---- desired range ---- | | |
1054 | * | state | or | state | | |
1055 | * | |
1056 | * There's a hole, we need to insert something in it and | |
1057 | * ignore the extent we found. | |
1058 | */ | |
1059 | if (state->start > start) { | |
1060 | u64 this_end; | |
1061 | if (end < last_start) | |
1062 | this_end = end; | |
1063 | else | |
1064 | this_end = last_start - 1; | |
1065 | ||
1066 | prealloc = alloc_extent_state_atomic(prealloc); | |
1cf4ffdb LB |
1067 | if (!prealloc) { |
1068 | err = -ENOMEM; | |
1069 | goto out; | |
1070 | } | |
462d6fac JB |
1071 | |
1072 | /* | |
1073 | * Avoid to free 'prealloc' if it can be merged with | |
1074 | * the later extent. | |
1075 | */ | |
1076 | err = insert_state(tree, prealloc, start, this_end, | |
1077 | &bits); | |
c2d904e0 JM |
1078 | if (err) |
1079 | extent_io_tree_panic(tree, err); | |
462d6fac JB |
1080 | prealloc = NULL; |
1081 | start = this_end + 1; | |
1082 | goto search_again; | |
1083 | } | |
1084 | /* | |
1085 | * | ---- desired range ---- | | |
1086 | * | state | | |
1087 | * We need to split the extent, and set the bit | |
1088 | * on the first half | |
1089 | */ | |
1090 | if (state->start <= end && state->end > end) { | |
1091 | prealloc = alloc_extent_state_atomic(prealloc); | |
1cf4ffdb LB |
1092 | if (!prealloc) { |
1093 | err = -ENOMEM; | |
1094 | goto out; | |
1095 | } | |
462d6fac JB |
1096 | |
1097 | err = split_state(tree, state, prealloc, end + 1); | |
c2d904e0 JM |
1098 | if (err) |
1099 | extent_io_tree_panic(tree, err); | |
462d6fac JB |
1100 | |
1101 | set_state_bits(tree, prealloc, &bits); | |
1102 | clear_state_bit(tree, prealloc, &clear_bits, 0); | |
462d6fac JB |
1103 | prealloc = NULL; |
1104 | goto out; | |
1105 | } | |
1106 | ||
1107 | goto search_again; | |
1108 | ||
1109 | out: | |
1110 | spin_unlock(&tree->lock); | |
1111 | if (prealloc) | |
1112 | free_extent_state(prealloc); | |
1113 | ||
1114 | return err; | |
1115 | ||
1116 | search_again: | |
1117 | if (start > end) | |
1118 | goto out; | |
1119 | spin_unlock(&tree->lock); | |
1120 | if (mask & __GFP_WAIT) | |
1121 | cond_resched(); | |
1122 | goto again; | |
1123 | } | |
1124 | ||
d1310b2e CM |
1125 | /* wrappers around set/clear extent bit */ |
1126 | int set_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end, | |
1127 | gfp_t mask) | |
1128 | { | |
3fbe5c02 | 1129 | return set_extent_bit(tree, start, end, EXTENT_DIRTY, NULL, |
2c64c53d | 1130 | NULL, mask); |
d1310b2e | 1131 | } |
d1310b2e CM |
1132 | |
1133 | int set_extent_bits(struct extent_io_tree *tree, u64 start, u64 end, | |
1134 | int bits, gfp_t mask) | |
1135 | { | |
3fbe5c02 | 1136 | return set_extent_bit(tree, start, end, bits, NULL, |
2c64c53d | 1137 | NULL, mask); |
d1310b2e | 1138 | } |
d1310b2e CM |
1139 | |
1140 | int clear_extent_bits(struct extent_io_tree *tree, u64 start, u64 end, | |
1141 | int bits, gfp_t mask) | |
1142 | { | |
2c64c53d | 1143 | return clear_extent_bit(tree, start, end, bits, 0, 0, NULL, mask); |
d1310b2e | 1144 | } |
d1310b2e CM |
1145 | |
1146 | int set_extent_delalloc(struct extent_io_tree *tree, u64 start, u64 end, | |
2ac55d41 | 1147 | struct extent_state **cached_state, gfp_t mask) |
d1310b2e CM |
1148 | { |
1149 | return set_extent_bit(tree, start, end, | |
fee187d9 | 1150 | EXTENT_DELALLOC | EXTENT_UPTODATE, |
3fbe5c02 | 1151 | NULL, cached_state, mask); |
d1310b2e | 1152 | } |
d1310b2e CM |
1153 | |
1154 | int clear_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end, | |
1155 | gfp_t mask) | |
1156 | { | |
1157 | return clear_extent_bit(tree, start, end, | |
32c00aff | 1158 | EXTENT_DIRTY | EXTENT_DELALLOC | |
0ca1f7ce | 1159 | EXTENT_DO_ACCOUNTING, 0, 0, NULL, mask); |
d1310b2e | 1160 | } |
d1310b2e CM |
1161 | |
1162 | int set_extent_new(struct extent_io_tree *tree, u64 start, u64 end, | |
1163 | gfp_t mask) | |
1164 | { | |
3fbe5c02 | 1165 | return set_extent_bit(tree, start, end, EXTENT_NEW, NULL, |
2c64c53d | 1166 | NULL, mask); |
d1310b2e | 1167 | } |
d1310b2e | 1168 | |
d1310b2e | 1169 | int set_extent_uptodate(struct extent_io_tree *tree, u64 start, u64 end, |
507903b8 | 1170 | struct extent_state **cached_state, gfp_t mask) |
d1310b2e | 1171 | { |
507903b8 | 1172 | return set_extent_bit(tree, start, end, EXTENT_UPTODATE, 0, |
3fbe5c02 | 1173 | cached_state, mask); |
d1310b2e | 1174 | } |
d1310b2e | 1175 | |
d397712b | 1176 | static int clear_extent_uptodate(struct extent_io_tree *tree, u64 start, |
2ac55d41 JB |
1177 | u64 end, struct extent_state **cached_state, |
1178 | gfp_t mask) | |
d1310b2e | 1179 | { |
2c64c53d | 1180 | return clear_extent_bit(tree, start, end, EXTENT_UPTODATE, 0, 0, |
2ac55d41 | 1181 | cached_state, mask); |
d1310b2e | 1182 | } |
d1310b2e | 1183 | |
d352ac68 CM |
1184 | /* |
1185 | * either insert or lock state struct between start and end use mask to tell | |
1186 | * us if waiting is desired. | |
1187 | */ | |
1edbb734 | 1188 | int lock_extent_bits(struct extent_io_tree *tree, u64 start, u64 end, |
d0082371 | 1189 | int bits, struct extent_state **cached_state) |
d1310b2e CM |
1190 | { |
1191 | int err; | |
1192 | u64 failed_start; | |
1193 | while (1) { | |
3fbe5c02 JM |
1194 | err = __set_extent_bit(tree, start, end, EXTENT_LOCKED | bits, |
1195 | EXTENT_LOCKED, &failed_start, | |
1196 | cached_state, GFP_NOFS); | |
d0082371 | 1197 | if (err == -EEXIST) { |
d1310b2e CM |
1198 | wait_extent_bit(tree, failed_start, end, EXTENT_LOCKED); |
1199 | start = failed_start; | |
d0082371 | 1200 | } else |
d1310b2e | 1201 | break; |
d1310b2e CM |
1202 | WARN_ON(start > end); |
1203 | } | |
1204 | return err; | |
1205 | } | |
d1310b2e | 1206 | |
d0082371 | 1207 | int lock_extent(struct extent_io_tree *tree, u64 start, u64 end) |
1edbb734 | 1208 | { |
d0082371 | 1209 | return lock_extent_bits(tree, start, end, 0, NULL); |
1edbb734 CM |
1210 | } |
1211 | ||
d0082371 | 1212 | int try_lock_extent(struct extent_io_tree *tree, u64 start, u64 end) |
25179201 JB |
1213 | { |
1214 | int err; | |
1215 | u64 failed_start; | |
1216 | ||
3fbe5c02 JM |
1217 | err = __set_extent_bit(tree, start, end, EXTENT_LOCKED, EXTENT_LOCKED, |
1218 | &failed_start, NULL, GFP_NOFS); | |
6643558d YZ |
1219 | if (err == -EEXIST) { |
1220 | if (failed_start > start) | |
1221 | clear_extent_bit(tree, start, failed_start - 1, | |
d0082371 | 1222 | EXTENT_LOCKED, 1, 0, NULL, GFP_NOFS); |
25179201 | 1223 | return 0; |
6643558d | 1224 | } |
25179201 JB |
1225 | return 1; |
1226 | } | |
25179201 | 1227 | |
2c64c53d CM |
1228 | int unlock_extent_cached(struct extent_io_tree *tree, u64 start, u64 end, |
1229 | struct extent_state **cached, gfp_t mask) | |
1230 | { | |
1231 | return clear_extent_bit(tree, start, end, EXTENT_LOCKED, 1, 0, cached, | |
1232 | mask); | |
1233 | } | |
1234 | ||
d0082371 | 1235 | int unlock_extent(struct extent_io_tree *tree, u64 start, u64 end) |
d1310b2e | 1236 | { |
2c64c53d | 1237 | return clear_extent_bit(tree, start, end, EXTENT_LOCKED, 1, 0, NULL, |
d0082371 | 1238 | GFP_NOFS); |
d1310b2e | 1239 | } |
d1310b2e | 1240 | |
d1310b2e CM |
1241 | /* |
1242 | * helper function to set both pages and extents in the tree writeback | |
1243 | */ | |
b2950863 | 1244 | static int set_range_writeback(struct extent_io_tree *tree, u64 start, u64 end) |
d1310b2e CM |
1245 | { |
1246 | unsigned long index = start >> PAGE_CACHE_SHIFT; | |
1247 | unsigned long end_index = end >> PAGE_CACHE_SHIFT; | |
1248 | struct page *page; | |
1249 | ||
1250 | while (index <= end_index) { | |
1251 | page = find_get_page(tree->mapping, index); | |
79787eaa | 1252 | BUG_ON(!page); /* Pages should be in the extent_io_tree */ |
d1310b2e CM |
1253 | set_page_writeback(page); |
1254 | page_cache_release(page); | |
1255 | index++; | |
1256 | } | |
d1310b2e CM |
1257 | return 0; |
1258 | } | |
d1310b2e | 1259 | |
d352ac68 CM |
1260 | /* find the first state struct with 'bits' set after 'start', and |
1261 | * return it. tree->lock must be held. NULL will returned if | |
1262 | * nothing was found after 'start' | |
1263 | */ | |
d7fc640e CM |
1264 | struct extent_state *find_first_extent_bit_state(struct extent_io_tree *tree, |
1265 | u64 start, int bits) | |
1266 | { | |
1267 | struct rb_node *node; | |
1268 | struct extent_state *state; | |
1269 | ||
1270 | /* | |
1271 | * this search will find all the extents that end after | |
1272 | * our range starts. | |
1273 | */ | |
1274 | node = tree_search(tree, start); | |
d397712b | 1275 | if (!node) |
d7fc640e | 1276 | goto out; |
d7fc640e | 1277 | |
d397712b | 1278 | while (1) { |
d7fc640e | 1279 | state = rb_entry(node, struct extent_state, rb_node); |
d397712b | 1280 | if (state->end >= start && (state->state & bits)) |
d7fc640e | 1281 | return state; |
d397712b | 1282 | |
d7fc640e CM |
1283 | node = rb_next(node); |
1284 | if (!node) | |
1285 | break; | |
1286 | } | |
1287 | out: | |
1288 | return NULL; | |
1289 | } | |
d7fc640e | 1290 | |
69261c4b XG |
1291 | /* |
1292 | * find the first offset in the io tree with 'bits' set. zero is | |
1293 | * returned if we find something, and *start_ret and *end_ret are | |
1294 | * set to reflect the state struct that was found. | |
1295 | * | |
1296 | * If nothing was found, 1 is returned, < 0 on error | |
1297 | */ | |
1298 | int find_first_extent_bit(struct extent_io_tree *tree, u64 start, | |
1299 | u64 *start_ret, u64 *end_ret, int bits) | |
1300 | { | |
1301 | struct extent_state *state; | |
1302 | int ret = 1; | |
1303 | ||
1304 | spin_lock(&tree->lock); | |
1305 | state = find_first_extent_bit_state(tree, start, bits); | |
1306 | if (state) { | |
1307 | *start_ret = state->start; | |
1308 | *end_ret = state->end; | |
1309 | ret = 0; | |
1310 | } | |
1311 | spin_unlock(&tree->lock); | |
1312 | return ret; | |
1313 | } | |
1314 | ||
d352ac68 CM |
1315 | /* |
1316 | * find a contiguous range of bytes in the file marked as delalloc, not | |
1317 | * more than 'max_bytes'. start and end are used to return the range, | |
1318 | * | |
1319 | * 1 is returned if we find something, 0 if nothing was in the tree | |
1320 | */ | |
c8b97818 | 1321 | static noinline u64 find_delalloc_range(struct extent_io_tree *tree, |
c2a128d2 JB |
1322 | u64 *start, u64 *end, u64 max_bytes, |
1323 | struct extent_state **cached_state) | |
d1310b2e CM |
1324 | { |
1325 | struct rb_node *node; | |
1326 | struct extent_state *state; | |
1327 | u64 cur_start = *start; | |
1328 | u64 found = 0; | |
1329 | u64 total_bytes = 0; | |
1330 | ||
cad321ad | 1331 | spin_lock(&tree->lock); |
c8b97818 | 1332 | |
d1310b2e CM |
1333 | /* |
1334 | * this search will find all the extents that end after | |
1335 | * our range starts. | |
1336 | */ | |
80ea96b1 | 1337 | node = tree_search(tree, cur_start); |
2b114d1d | 1338 | if (!node) { |
3b951516 CM |
1339 | if (!found) |
1340 | *end = (u64)-1; | |
d1310b2e CM |
1341 | goto out; |
1342 | } | |
1343 | ||
d397712b | 1344 | while (1) { |
d1310b2e | 1345 | state = rb_entry(node, struct extent_state, rb_node); |
5b21f2ed ZY |
1346 | if (found && (state->start != cur_start || |
1347 | (state->state & EXTENT_BOUNDARY))) { | |
d1310b2e CM |
1348 | goto out; |
1349 | } | |
1350 | if (!(state->state & EXTENT_DELALLOC)) { | |
1351 | if (!found) | |
1352 | *end = state->end; | |
1353 | goto out; | |
1354 | } | |
c2a128d2 | 1355 | if (!found) { |
d1310b2e | 1356 | *start = state->start; |
c2a128d2 JB |
1357 | *cached_state = state; |
1358 | atomic_inc(&state->refs); | |
1359 | } | |
d1310b2e CM |
1360 | found++; |
1361 | *end = state->end; | |
1362 | cur_start = state->end + 1; | |
1363 | node = rb_next(node); | |
1364 | if (!node) | |
1365 | break; | |
1366 | total_bytes += state->end - state->start + 1; | |
1367 | if (total_bytes >= max_bytes) | |
1368 | break; | |
1369 | } | |
1370 | out: | |
cad321ad | 1371 | spin_unlock(&tree->lock); |
d1310b2e CM |
1372 | return found; |
1373 | } | |
1374 | ||
143bede5 JM |
1375 | static noinline void __unlock_for_delalloc(struct inode *inode, |
1376 | struct page *locked_page, | |
1377 | u64 start, u64 end) | |
c8b97818 CM |
1378 | { |
1379 | int ret; | |
1380 | struct page *pages[16]; | |
1381 | unsigned long index = start >> PAGE_CACHE_SHIFT; | |
1382 | unsigned long end_index = end >> PAGE_CACHE_SHIFT; | |
1383 | unsigned long nr_pages = end_index - index + 1; | |
1384 | int i; | |
1385 | ||
1386 | if (index == locked_page->index && end_index == index) | |
143bede5 | 1387 | return; |
c8b97818 | 1388 | |
d397712b | 1389 | while (nr_pages > 0) { |
c8b97818 | 1390 | ret = find_get_pages_contig(inode->i_mapping, index, |
5b050f04 CM |
1391 | min_t(unsigned long, nr_pages, |
1392 | ARRAY_SIZE(pages)), pages); | |
c8b97818 CM |
1393 | for (i = 0; i < ret; i++) { |
1394 | if (pages[i] != locked_page) | |
1395 | unlock_page(pages[i]); | |
1396 | page_cache_release(pages[i]); | |
1397 | } | |
1398 | nr_pages -= ret; | |
1399 | index += ret; | |
1400 | cond_resched(); | |
1401 | } | |
c8b97818 CM |
1402 | } |
1403 | ||
1404 | static noinline int lock_delalloc_pages(struct inode *inode, | |
1405 | struct page *locked_page, | |
1406 | u64 delalloc_start, | |
1407 | u64 delalloc_end) | |
1408 | { | |
1409 | unsigned long index = delalloc_start >> PAGE_CACHE_SHIFT; | |
1410 | unsigned long start_index = index; | |
1411 | unsigned long end_index = delalloc_end >> PAGE_CACHE_SHIFT; | |
1412 | unsigned long pages_locked = 0; | |
1413 | struct page *pages[16]; | |
1414 | unsigned long nrpages; | |
1415 | int ret; | |
1416 | int i; | |
1417 | ||
1418 | /* the caller is responsible for locking the start index */ | |
1419 | if (index == locked_page->index && index == end_index) | |
1420 | return 0; | |
1421 | ||
1422 | /* skip the page at the start index */ | |
1423 | nrpages = end_index - index + 1; | |
d397712b | 1424 | while (nrpages > 0) { |
c8b97818 | 1425 | ret = find_get_pages_contig(inode->i_mapping, index, |
5b050f04 CM |
1426 | min_t(unsigned long, |
1427 | nrpages, ARRAY_SIZE(pages)), pages); | |
c8b97818 CM |
1428 | if (ret == 0) { |
1429 | ret = -EAGAIN; | |
1430 | goto done; | |
1431 | } | |
1432 | /* now we have an array of pages, lock them all */ | |
1433 | for (i = 0; i < ret; i++) { | |
1434 | /* | |
1435 | * the caller is taking responsibility for | |
1436 | * locked_page | |
1437 | */ | |
771ed689 | 1438 | if (pages[i] != locked_page) { |
c8b97818 | 1439 | lock_page(pages[i]); |
f2b1c41c CM |
1440 | if (!PageDirty(pages[i]) || |
1441 | pages[i]->mapping != inode->i_mapping) { | |
771ed689 CM |
1442 | ret = -EAGAIN; |
1443 | unlock_page(pages[i]); | |
1444 | page_cache_release(pages[i]); | |
1445 | goto done; | |
1446 | } | |
1447 | } | |
c8b97818 | 1448 | page_cache_release(pages[i]); |
771ed689 | 1449 | pages_locked++; |
c8b97818 | 1450 | } |
c8b97818 CM |
1451 | nrpages -= ret; |
1452 | index += ret; | |
1453 | cond_resched(); | |
1454 | } | |
1455 | ret = 0; | |
1456 | done: | |
1457 | if (ret && pages_locked) { | |
1458 | __unlock_for_delalloc(inode, locked_page, | |
1459 | delalloc_start, | |
1460 | ((u64)(start_index + pages_locked - 1)) << | |
1461 | PAGE_CACHE_SHIFT); | |
1462 | } | |
1463 | return ret; | |
1464 | } | |
1465 | ||
1466 | /* | |
1467 | * find a contiguous range of bytes in the file marked as delalloc, not | |
1468 | * more than 'max_bytes'. start and end are used to return the range, | |
1469 | * | |
1470 | * 1 is returned if we find something, 0 if nothing was in the tree | |
1471 | */ | |
1472 | static noinline u64 find_lock_delalloc_range(struct inode *inode, | |
1473 | struct extent_io_tree *tree, | |
1474 | struct page *locked_page, | |
1475 | u64 *start, u64 *end, | |
1476 | u64 max_bytes) | |
1477 | { | |
1478 | u64 delalloc_start; | |
1479 | u64 delalloc_end; | |
1480 | u64 found; | |
9655d298 | 1481 | struct extent_state *cached_state = NULL; |
c8b97818 CM |
1482 | int ret; |
1483 | int loops = 0; | |
1484 | ||
1485 | again: | |
1486 | /* step one, find a bunch of delalloc bytes starting at start */ | |
1487 | delalloc_start = *start; | |
1488 | delalloc_end = 0; | |
1489 | found = find_delalloc_range(tree, &delalloc_start, &delalloc_end, | |
c2a128d2 | 1490 | max_bytes, &cached_state); |
70b99e69 | 1491 | if (!found || delalloc_end <= *start) { |
c8b97818 CM |
1492 | *start = delalloc_start; |
1493 | *end = delalloc_end; | |
c2a128d2 | 1494 | free_extent_state(cached_state); |
c8b97818 CM |
1495 | return found; |
1496 | } | |
1497 | ||
70b99e69 CM |
1498 | /* |
1499 | * start comes from the offset of locked_page. We have to lock | |
1500 | * pages in order, so we can't process delalloc bytes before | |
1501 | * locked_page | |
1502 | */ | |
d397712b | 1503 | if (delalloc_start < *start) |
70b99e69 | 1504 | delalloc_start = *start; |
70b99e69 | 1505 | |
c8b97818 CM |
1506 | /* |
1507 | * make sure to limit the number of pages we try to lock down | |
1508 | * if we're looping. | |
1509 | */ | |
d397712b | 1510 | if (delalloc_end + 1 - delalloc_start > max_bytes && loops) |
771ed689 | 1511 | delalloc_end = delalloc_start + PAGE_CACHE_SIZE - 1; |
d397712b | 1512 | |
c8b97818 CM |
1513 | /* step two, lock all the pages after the page that has start */ |
1514 | ret = lock_delalloc_pages(inode, locked_page, | |
1515 | delalloc_start, delalloc_end); | |
1516 | if (ret == -EAGAIN) { | |
1517 | /* some of the pages are gone, lets avoid looping by | |
1518 | * shortening the size of the delalloc range we're searching | |
1519 | */ | |
9655d298 | 1520 | free_extent_state(cached_state); |
c8b97818 CM |
1521 | if (!loops) { |
1522 | unsigned long offset = (*start) & (PAGE_CACHE_SIZE - 1); | |
1523 | max_bytes = PAGE_CACHE_SIZE - offset; | |
1524 | loops = 1; | |
1525 | goto again; | |
1526 | } else { | |
1527 | found = 0; | |
1528 | goto out_failed; | |
1529 | } | |
1530 | } | |
79787eaa | 1531 | BUG_ON(ret); /* Only valid values are 0 and -EAGAIN */ |
c8b97818 CM |
1532 | |
1533 | /* step three, lock the state bits for the whole range */ | |
d0082371 | 1534 | lock_extent_bits(tree, delalloc_start, delalloc_end, 0, &cached_state); |
c8b97818 CM |
1535 | |
1536 | /* then test to make sure it is all still delalloc */ | |
1537 | ret = test_range_bit(tree, delalloc_start, delalloc_end, | |
9655d298 | 1538 | EXTENT_DELALLOC, 1, cached_state); |
c8b97818 | 1539 | if (!ret) { |
9655d298 CM |
1540 | unlock_extent_cached(tree, delalloc_start, delalloc_end, |
1541 | &cached_state, GFP_NOFS); | |
c8b97818 CM |
1542 | __unlock_for_delalloc(inode, locked_page, |
1543 | delalloc_start, delalloc_end); | |
1544 | cond_resched(); | |
1545 | goto again; | |
1546 | } | |
9655d298 | 1547 | free_extent_state(cached_state); |
c8b97818 CM |
1548 | *start = delalloc_start; |
1549 | *end = delalloc_end; | |
1550 | out_failed: | |
1551 | return found; | |
1552 | } | |
1553 | ||
1554 | int extent_clear_unlock_delalloc(struct inode *inode, | |
1555 | struct extent_io_tree *tree, | |
1556 | u64 start, u64 end, struct page *locked_page, | |
a791e35e | 1557 | unsigned long op) |
c8b97818 CM |
1558 | { |
1559 | int ret; | |
1560 | struct page *pages[16]; | |
1561 | unsigned long index = start >> PAGE_CACHE_SHIFT; | |
1562 | unsigned long end_index = end >> PAGE_CACHE_SHIFT; | |
1563 | unsigned long nr_pages = end_index - index + 1; | |
1564 | int i; | |
771ed689 | 1565 | int clear_bits = 0; |
c8b97818 | 1566 | |
a791e35e | 1567 | if (op & EXTENT_CLEAR_UNLOCK) |
771ed689 | 1568 | clear_bits |= EXTENT_LOCKED; |
a791e35e | 1569 | if (op & EXTENT_CLEAR_DIRTY) |
c8b97818 CM |
1570 | clear_bits |= EXTENT_DIRTY; |
1571 | ||
a791e35e | 1572 | if (op & EXTENT_CLEAR_DELALLOC) |
771ed689 CM |
1573 | clear_bits |= EXTENT_DELALLOC; |
1574 | ||
2c64c53d | 1575 | clear_extent_bit(tree, start, end, clear_bits, 1, 0, NULL, GFP_NOFS); |
32c00aff JB |
1576 | if (!(op & (EXTENT_CLEAR_UNLOCK_PAGE | EXTENT_CLEAR_DIRTY | |
1577 | EXTENT_SET_WRITEBACK | EXTENT_END_WRITEBACK | | |
1578 | EXTENT_SET_PRIVATE2))) | |
771ed689 | 1579 | return 0; |
c8b97818 | 1580 | |
d397712b | 1581 | while (nr_pages > 0) { |
c8b97818 | 1582 | ret = find_get_pages_contig(inode->i_mapping, index, |
5b050f04 CM |
1583 | min_t(unsigned long, |
1584 | nr_pages, ARRAY_SIZE(pages)), pages); | |
c8b97818 | 1585 | for (i = 0; i < ret; i++) { |
8b62b72b | 1586 | |
a791e35e | 1587 | if (op & EXTENT_SET_PRIVATE2) |
8b62b72b CM |
1588 | SetPagePrivate2(pages[i]); |
1589 | ||
c8b97818 CM |
1590 | if (pages[i] == locked_page) { |
1591 | page_cache_release(pages[i]); | |
1592 | continue; | |
1593 | } | |
a791e35e | 1594 | if (op & EXTENT_CLEAR_DIRTY) |
c8b97818 | 1595 | clear_page_dirty_for_io(pages[i]); |
a791e35e | 1596 | if (op & EXTENT_SET_WRITEBACK) |
c8b97818 | 1597 | set_page_writeback(pages[i]); |
a791e35e | 1598 | if (op & EXTENT_END_WRITEBACK) |
c8b97818 | 1599 | end_page_writeback(pages[i]); |
a791e35e | 1600 | if (op & EXTENT_CLEAR_UNLOCK_PAGE) |
771ed689 | 1601 | unlock_page(pages[i]); |
c8b97818 CM |
1602 | page_cache_release(pages[i]); |
1603 | } | |
1604 | nr_pages -= ret; | |
1605 | index += ret; | |
1606 | cond_resched(); | |
1607 | } | |
1608 | return 0; | |
1609 | } | |
c8b97818 | 1610 | |
d352ac68 CM |
1611 | /* |
1612 | * count the number of bytes in the tree that have a given bit(s) | |
1613 | * set. This can be fairly slow, except for EXTENT_DIRTY which is | |
1614 | * cached. The total number found is returned. | |
1615 | */ | |
d1310b2e CM |
1616 | u64 count_range_bits(struct extent_io_tree *tree, |
1617 | u64 *start, u64 search_end, u64 max_bytes, | |
ec29ed5b | 1618 | unsigned long bits, int contig) |
d1310b2e CM |
1619 | { |
1620 | struct rb_node *node; | |
1621 | struct extent_state *state; | |
1622 | u64 cur_start = *start; | |
1623 | u64 total_bytes = 0; | |
ec29ed5b | 1624 | u64 last = 0; |
d1310b2e CM |
1625 | int found = 0; |
1626 | ||
1627 | if (search_end <= cur_start) { | |
d1310b2e CM |
1628 | WARN_ON(1); |
1629 | return 0; | |
1630 | } | |
1631 | ||
cad321ad | 1632 | spin_lock(&tree->lock); |
d1310b2e CM |
1633 | if (cur_start == 0 && bits == EXTENT_DIRTY) { |
1634 | total_bytes = tree->dirty_bytes; | |
1635 | goto out; | |
1636 | } | |
1637 | /* | |
1638 | * this search will find all the extents that end after | |
1639 | * our range starts. | |
1640 | */ | |
80ea96b1 | 1641 | node = tree_search(tree, cur_start); |
d397712b | 1642 | if (!node) |
d1310b2e | 1643 | goto out; |
d1310b2e | 1644 | |
d397712b | 1645 | while (1) { |
d1310b2e CM |
1646 | state = rb_entry(node, struct extent_state, rb_node); |
1647 | if (state->start > search_end) | |
1648 | break; | |
ec29ed5b CM |
1649 | if (contig && found && state->start > last + 1) |
1650 | break; | |
1651 | if (state->end >= cur_start && (state->state & bits) == bits) { | |
d1310b2e CM |
1652 | total_bytes += min(search_end, state->end) + 1 - |
1653 | max(cur_start, state->start); | |
1654 | if (total_bytes >= max_bytes) | |
1655 | break; | |
1656 | if (!found) { | |
af60bed2 | 1657 | *start = max(cur_start, state->start); |
d1310b2e CM |
1658 | found = 1; |
1659 | } | |
ec29ed5b CM |
1660 | last = state->end; |
1661 | } else if (contig && found) { | |
1662 | break; | |
d1310b2e CM |
1663 | } |
1664 | node = rb_next(node); | |
1665 | if (!node) | |
1666 | break; | |
1667 | } | |
1668 | out: | |
cad321ad | 1669 | spin_unlock(&tree->lock); |
d1310b2e CM |
1670 | return total_bytes; |
1671 | } | |
b2950863 | 1672 | |
d352ac68 CM |
1673 | /* |
1674 | * set the private field for a given byte offset in the tree. If there isn't | |
1675 | * an extent_state there already, this does nothing. | |
1676 | */ | |
d1310b2e CM |
1677 | int set_state_private(struct extent_io_tree *tree, u64 start, u64 private) |
1678 | { | |
1679 | struct rb_node *node; | |
1680 | struct extent_state *state; | |
1681 | int ret = 0; | |
1682 | ||
cad321ad | 1683 | spin_lock(&tree->lock); |
d1310b2e CM |
1684 | /* |
1685 | * this search will find all the extents that end after | |
1686 | * our range starts. | |
1687 | */ | |
80ea96b1 | 1688 | node = tree_search(tree, start); |
2b114d1d | 1689 | if (!node) { |
d1310b2e CM |
1690 | ret = -ENOENT; |
1691 | goto out; | |
1692 | } | |
1693 | state = rb_entry(node, struct extent_state, rb_node); | |
1694 | if (state->start != start) { | |
1695 | ret = -ENOENT; | |
1696 | goto out; | |
1697 | } | |
1698 | state->private = private; | |
1699 | out: | |
cad321ad | 1700 | spin_unlock(&tree->lock); |
d1310b2e CM |
1701 | return ret; |
1702 | } | |
1703 | ||
1704 | int get_state_private(struct extent_io_tree *tree, u64 start, u64 *private) | |
1705 | { | |
1706 | struct rb_node *node; | |
1707 | struct extent_state *state; | |
1708 | int ret = 0; | |
1709 | ||
cad321ad | 1710 | spin_lock(&tree->lock); |
d1310b2e CM |
1711 | /* |
1712 | * this search will find all the extents that end after | |
1713 | * our range starts. | |
1714 | */ | |
80ea96b1 | 1715 | node = tree_search(tree, start); |
2b114d1d | 1716 | if (!node) { |
d1310b2e CM |
1717 | ret = -ENOENT; |
1718 | goto out; | |
1719 | } | |
1720 | state = rb_entry(node, struct extent_state, rb_node); | |
1721 | if (state->start != start) { | |
1722 | ret = -ENOENT; | |
1723 | goto out; | |
1724 | } | |
1725 | *private = state->private; | |
1726 | out: | |
cad321ad | 1727 | spin_unlock(&tree->lock); |
d1310b2e CM |
1728 | return ret; |
1729 | } | |
1730 | ||
1731 | /* | |
1732 | * searches a range in the state tree for a given mask. | |
70dec807 | 1733 | * If 'filled' == 1, this returns 1 only if every extent in the tree |
d1310b2e CM |
1734 | * has the bits set. Otherwise, 1 is returned if any bit in the |
1735 | * range is found set. | |
1736 | */ | |
1737 | int test_range_bit(struct extent_io_tree *tree, u64 start, u64 end, | |
9655d298 | 1738 | int bits, int filled, struct extent_state *cached) |
d1310b2e CM |
1739 | { |
1740 | struct extent_state *state = NULL; | |
1741 | struct rb_node *node; | |
1742 | int bitset = 0; | |
d1310b2e | 1743 | |
cad321ad | 1744 | spin_lock(&tree->lock); |
df98b6e2 JB |
1745 | if (cached && cached->tree && cached->start <= start && |
1746 | cached->end > start) | |
9655d298 CM |
1747 | node = &cached->rb_node; |
1748 | else | |
1749 | node = tree_search(tree, start); | |
d1310b2e CM |
1750 | while (node && start <= end) { |
1751 | state = rb_entry(node, struct extent_state, rb_node); | |
1752 | ||
1753 | if (filled && state->start > start) { | |
1754 | bitset = 0; | |
1755 | break; | |
1756 | } | |
1757 | ||
1758 | if (state->start > end) | |
1759 | break; | |
1760 | ||
1761 | if (state->state & bits) { | |
1762 | bitset = 1; | |
1763 | if (!filled) | |
1764 | break; | |
1765 | } else if (filled) { | |
1766 | bitset = 0; | |
1767 | break; | |
1768 | } | |
46562cec CM |
1769 | |
1770 | if (state->end == (u64)-1) | |
1771 | break; | |
1772 | ||
d1310b2e CM |
1773 | start = state->end + 1; |
1774 | if (start > end) | |
1775 | break; | |
1776 | node = rb_next(node); | |
1777 | if (!node) { | |
1778 | if (filled) | |
1779 | bitset = 0; | |
1780 | break; | |
1781 | } | |
1782 | } | |
cad321ad | 1783 | spin_unlock(&tree->lock); |
d1310b2e CM |
1784 | return bitset; |
1785 | } | |
d1310b2e CM |
1786 | |
1787 | /* | |
1788 | * helper function to set a given page up to date if all the | |
1789 | * extents in the tree for that page are up to date | |
1790 | */ | |
143bede5 | 1791 | static void check_page_uptodate(struct extent_io_tree *tree, struct page *page) |
d1310b2e CM |
1792 | { |
1793 | u64 start = (u64)page->index << PAGE_CACHE_SHIFT; | |
1794 | u64 end = start + PAGE_CACHE_SIZE - 1; | |
9655d298 | 1795 | if (test_range_bit(tree, start, end, EXTENT_UPTODATE, 1, NULL)) |
d1310b2e | 1796 | SetPageUptodate(page); |
d1310b2e CM |
1797 | } |
1798 | ||
1799 | /* | |
1800 | * helper function to unlock a page if all the extents in the tree | |
1801 | * for that page are unlocked | |
1802 | */ | |
143bede5 | 1803 | static void check_page_locked(struct extent_io_tree *tree, struct page *page) |
d1310b2e CM |
1804 | { |
1805 | u64 start = (u64)page->index << PAGE_CACHE_SHIFT; | |
1806 | u64 end = start + PAGE_CACHE_SIZE - 1; | |
9655d298 | 1807 | if (!test_range_bit(tree, start, end, EXTENT_LOCKED, 0, NULL)) |
d1310b2e | 1808 | unlock_page(page); |
d1310b2e CM |
1809 | } |
1810 | ||
1811 | /* | |
1812 | * helper function to end page writeback if all the extents | |
1813 | * in the tree for that page are done with writeback | |
1814 | */ | |
143bede5 JM |
1815 | static void check_page_writeback(struct extent_io_tree *tree, |
1816 | struct page *page) | |
d1310b2e | 1817 | { |
1edbb734 | 1818 | end_page_writeback(page); |
d1310b2e CM |
1819 | } |
1820 | ||
4a54c8c1 JS |
1821 | /* |
1822 | * When IO fails, either with EIO or csum verification fails, we | |
1823 | * try other mirrors that might have a good copy of the data. This | |
1824 | * io_failure_record is used to record state as we go through all the | |
1825 | * mirrors. If another mirror has good data, the page is set up to date | |
1826 | * and things continue. If a good mirror can't be found, the original | |
1827 | * bio end_io callback is called to indicate things have failed. | |
1828 | */ | |
1829 | struct io_failure_record { | |
1830 | struct page *page; | |
1831 | u64 start; | |
1832 | u64 len; | |
1833 | u64 logical; | |
1834 | unsigned long bio_flags; | |
1835 | int this_mirror; | |
1836 | int failed_mirror; | |
1837 | int in_validation; | |
1838 | }; | |
1839 | ||
1840 | static int free_io_failure(struct inode *inode, struct io_failure_record *rec, | |
1841 | int did_repair) | |
1842 | { | |
1843 | int ret; | |
1844 | int err = 0; | |
1845 | struct extent_io_tree *failure_tree = &BTRFS_I(inode)->io_failure_tree; | |
1846 | ||
1847 | set_state_private(failure_tree, rec->start, 0); | |
1848 | ret = clear_extent_bits(failure_tree, rec->start, | |
1849 | rec->start + rec->len - 1, | |
1850 | EXTENT_LOCKED | EXTENT_DIRTY, GFP_NOFS); | |
1851 | if (ret) | |
1852 | err = ret; | |
1853 | ||
1854 | if (did_repair) { | |
1855 | ret = clear_extent_bits(&BTRFS_I(inode)->io_tree, rec->start, | |
1856 | rec->start + rec->len - 1, | |
1857 | EXTENT_DAMAGED, GFP_NOFS); | |
1858 | if (ret && !err) | |
1859 | err = ret; | |
1860 | } | |
1861 | ||
1862 | kfree(rec); | |
1863 | return err; | |
1864 | } | |
1865 | ||
1866 | static void repair_io_failure_callback(struct bio *bio, int err) | |
1867 | { | |
1868 | complete(bio->bi_private); | |
1869 | } | |
1870 | ||
1871 | /* | |
1872 | * this bypasses the standard btrfs submit functions deliberately, as | |
1873 | * the standard behavior is to write all copies in a raid setup. here we only | |
1874 | * want to write the one bad copy. so we do the mapping for ourselves and issue | |
1875 | * submit_bio directly. | |
1876 | * to avoid any synchonization issues, wait for the data after writing, which | |
1877 | * actually prevents the read that triggered the error from finishing. | |
1878 | * currently, there can be no more than two copies of every data bit. thus, | |
1879 | * exactly one rewrite is required. | |
1880 | */ | |
1881 | int repair_io_failure(struct btrfs_mapping_tree *map_tree, u64 start, | |
1882 | u64 length, u64 logical, struct page *page, | |
1883 | int mirror_num) | |
1884 | { | |
1885 | struct bio *bio; | |
1886 | struct btrfs_device *dev; | |
1887 | DECLARE_COMPLETION_ONSTACK(compl); | |
1888 | u64 map_length = 0; | |
1889 | u64 sector; | |
1890 | struct btrfs_bio *bbio = NULL; | |
1891 | int ret; | |
1892 | ||
1893 | BUG_ON(!mirror_num); | |
1894 | ||
1895 | bio = bio_alloc(GFP_NOFS, 1); | |
1896 | if (!bio) | |
1897 | return -EIO; | |
1898 | bio->bi_private = &compl; | |
1899 | bio->bi_end_io = repair_io_failure_callback; | |
1900 | bio->bi_size = 0; | |
1901 | map_length = length; | |
1902 | ||
1903 | ret = btrfs_map_block(map_tree, WRITE, logical, | |
1904 | &map_length, &bbio, mirror_num); | |
1905 | if (ret) { | |
1906 | bio_put(bio); | |
1907 | return -EIO; | |
1908 | } | |
1909 | BUG_ON(mirror_num != bbio->mirror_num); | |
1910 | sector = bbio->stripes[mirror_num-1].physical >> 9; | |
1911 | bio->bi_sector = sector; | |
1912 | dev = bbio->stripes[mirror_num-1].dev; | |
1913 | kfree(bbio); | |
1914 | if (!dev || !dev->bdev || !dev->writeable) { | |
1915 | bio_put(bio); | |
1916 | return -EIO; | |
1917 | } | |
1918 | bio->bi_bdev = dev->bdev; | |
1919 | bio_add_page(bio, page, length, start-page_offset(page)); | |
21adbd5c | 1920 | btrfsic_submit_bio(WRITE_SYNC, bio); |
4a54c8c1 JS |
1921 | wait_for_completion(&compl); |
1922 | ||
1923 | if (!test_bit(BIO_UPTODATE, &bio->bi_flags)) { | |
1924 | /* try to remap that extent elsewhere? */ | |
1925 | bio_put(bio); | |
1926 | return -EIO; | |
1927 | } | |
1928 | ||
1929 | printk(KERN_INFO "btrfs read error corrected: ino %lu off %llu (dev %s " | |
1930 | "sector %llu)\n", page->mapping->host->i_ino, start, | |
1931 | dev->name, sector); | |
1932 | ||
1933 | bio_put(bio); | |
1934 | return 0; | |
1935 | } | |
1936 | ||
ea466794 JB |
1937 | int repair_eb_io_failure(struct btrfs_root *root, struct extent_buffer *eb, |
1938 | int mirror_num) | |
1939 | { | |
1940 | struct btrfs_mapping_tree *map_tree = &root->fs_info->mapping_tree; | |
1941 | u64 start = eb->start; | |
1942 | unsigned long i, num_pages = num_extent_pages(eb->start, eb->len); | |
d95603b2 | 1943 | int ret = 0; |
ea466794 JB |
1944 | |
1945 | for (i = 0; i < num_pages; i++) { | |
1946 | struct page *p = extent_buffer_page(eb, i); | |
1947 | ret = repair_io_failure(map_tree, start, PAGE_CACHE_SIZE, | |
1948 | start, p, mirror_num); | |
1949 | if (ret) | |
1950 | break; | |
1951 | start += PAGE_CACHE_SIZE; | |
1952 | } | |
1953 | ||
1954 | return ret; | |
1955 | } | |
1956 | ||
4a54c8c1 JS |
1957 | /* |
1958 | * each time an IO finishes, we do a fast check in the IO failure tree | |
1959 | * to see if we need to process or clean up an io_failure_record | |
1960 | */ | |
1961 | static int clean_io_failure(u64 start, struct page *page) | |
1962 | { | |
1963 | u64 private; | |
1964 | u64 private_failure; | |
1965 | struct io_failure_record *failrec; | |
1966 | struct btrfs_mapping_tree *map_tree; | |
1967 | struct extent_state *state; | |
1968 | int num_copies; | |
1969 | int did_repair = 0; | |
1970 | int ret; | |
1971 | struct inode *inode = page->mapping->host; | |
1972 | ||
1973 | private = 0; | |
1974 | ret = count_range_bits(&BTRFS_I(inode)->io_failure_tree, &private, | |
1975 | (u64)-1, 1, EXTENT_DIRTY, 0); | |
1976 | if (!ret) | |
1977 | return 0; | |
1978 | ||
1979 | ret = get_state_private(&BTRFS_I(inode)->io_failure_tree, start, | |
1980 | &private_failure); | |
1981 | if (ret) | |
1982 | return 0; | |
1983 | ||
1984 | failrec = (struct io_failure_record *)(unsigned long) private_failure; | |
1985 | BUG_ON(!failrec->this_mirror); | |
1986 | ||
1987 | if (failrec->in_validation) { | |
1988 | /* there was no real error, just free the record */ | |
1989 | pr_debug("clean_io_failure: freeing dummy error at %llu\n", | |
1990 | failrec->start); | |
1991 | did_repair = 1; | |
1992 | goto out; | |
1993 | } | |
1994 | ||
1995 | spin_lock(&BTRFS_I(inode)->io_tree.lock); | |
1996 | state = find_first_extent_bit_state(&BTRFS_I(inode)->io_tree, | |
1997 | failrec->start, | |
1998 | EXTENT_LOCKED); | |
1999 | spin_unlock(&BTRFS_I(inode)->io_tree.lock); | |
2000 | ||
2001 | if (state && state->start == failrec->start) { | |
2002 | map_tree = &BTRFS_I(inode)->root->fs_info->mapping_tree; | |
2003 | num_copies = btrfs_num_copies(map_tree, failrec->logical, | |
2004 | failrec->len); | |
2005 | if (num_copies > 1) { | |
2006 | ret = repair_io_failure(map_tree, start, failrec->len, | |
2007 | failrec->logical, page, | |
2008 | failrec->failed_mirror); | |
2009 | did_repair = !ret; | |
2010 | } | |
2011 | } | |
2012 | ||
2013 | out: | |
2014 | if (!ret) | |
2015 | ret = free_io_failure(inode, failrec, did_repair); | |
2016 | ||
2017 | return ret; | |
2018 | } | |
2019 | ||
2020 | /* | |
2021 | * this is a generic handler for readpage errors (default | |
2022 | * readpage_io_failed_hook). if other copies exist, read those and write back | |
2023 | * good data to the failed position. does not investigate in remapping the | |
2024 | * failed extent elsewhere, hoping the device will be smart enough to do this as | |
2025 | * needed | |
2026 | */ | |
2027 | ||
2028 | static int bio_readpage_error(struct bio *failed_bio, struct page *page, | |
2029 | u64 start, u64 end, int failed_mirror, | |
2030 | struct extent_state *state) | |
2031 | { | |
2032 | struct io_failure_record *failrec = NULL; | |
2033 | u64 private; | |
2034 | struct extent_map *em; | |
2035 | struct inode *inode = page->mapping->host; | |
2036 | struct extent_io_tree *failure_tree = &BTRFS_I(inode)->io_failure_tree; | |
2037 | struct extent_io_tree *tree = &BTRFS_I(inode)->io_tree; | |
2038 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; | |
2039 | struct bio *bio; | |
2040 | int num_copies; | |
2041 | int ret; | |
2042 | int read_mode; | |
2043 | u64 logical; | |
2044 | ||
2045 | BUG_ON(failed_bio->bi_rw & REQ_WRITE); | |
2046 | ||
2047 | ret = get_state_private(failure_tree, start, &private); | |
2048 | if (ret) { | |
2049 | failrec = kzalloc(sizeof(*failrec), GFP_NOFS); | |
2050 | if (!failrec) | |
2051 | return -ENOMEM; | |
2052 | failrec->start = start; | |
2053 | failrec->len = end - start + 1; | |
2054 | failrec->this_mirror = 0; | |
2055 | failrec->bio_flags = 0; | |
2056 | failrec->in_validation = 0; | |
2057 | ||
2058 | read_lock(&em_tree->lock); | |
2059 | em = lookup_extent_mapping(em_tree, start, failrec->len); | |
2060 | if (!em) { | |
2061 | read_unlock(&em_tree->lock); | |
2062 | kfree(failrec); | |
2063 | return -EIO; | |
2064 | } | |
2065 | ||
2066 | if (em->start > start || em->start + em->len < start) { | |
2067 | free_extent_map(em); | |
2068 | em = NULL; | |
2069 | } | |
2070 | read_unlock(&em_tree->lock); | |
2071 | ||
2072 | if (!em || IS_ERR(em)) { | |
2073 | kfree(failrec); | |
2074 | return -EIO; | |
2075 | } | |
2076 | logical = start - em->start; | |
2077 | logical = em->block_start + logical; | |
2078 | if (test_bit(EXTENT_FLAG_COMPRESSED, &em->flags)) { | |
2079 | logical = em->block_start; | |
2080 | failrec->bio_flags = EXTENT_BIO_COMPRESSED; | |
2081 | extent_set_compress_type(&failrec->bio_flags, | |
2082 | em->compress_type); | |
2083 | } | |
2084 | pr_debug("bio_readpage_error: (new) logical=%llu, start=%llu, " | |
2085 | "len=%llu\n", logical, start, failrec->len); | |
2086 | failrec->logical = logical; | |
2087 | free_extent_map(em); | |
2088 | ||
2089 | /* set the bits in the private failure tree */ | |
2090 | ret = set_extent_bits(failure_tree, start, end, | |
2091 | EXTENT_LOCKED | EXTENT_DIRTY, GFP_NOFS); | |
2092 | if (ret >= 0) | |
2093 | ret = set_state_private(failure_tree, start, | |
2094 | (u64)(unsigned long)failrec); | |
2095 | /* set the bits in the inode's tree */ | |
2096 | if (ret >= 0) | |
2097 | ret = set_extent_bits(tree, start, end, EXTENT_DAMAGED, | |
2098 | GFP_NOFS); | |
2099 | if (ret < 0) { | |
2100 | kfree(failrec); | |
2101 | return ret; | |
2102 | } | |
2103 | } else { | |
2104 | failrec = (struct io_failure_record *)(unsigned long)private; | |
2105 | pr_debug("bio_readpage_error: (found) logical=%llu, " | |
2106 | "start=%llu, len=%llu, validation=%d\n", | |
2107 | failrec->logical, failrec->start, failrec->len, | |
2108 | failrec->in_validation); | |
2109 | /* | |
2110 | * when data can be on disk more than twice, add to failrec here | |
2111 | * (e.g. with a list for failed_mirror) to make | |
2112 | * clean_io_failure() clean all those errors at once. | |
2113 | */ | |
2114 | } | |
2115 | num_copies = btrfs_num_copies( | |
2116 | &BTRFS_I(inode)->root->fs_info->mapping_tree, | |
2117 | failrec->logical, failrec->len); | |
2118 | if (num_copies == 1) { | |
2119 | /* | |
2120 | * we only have a single copy of the data, so don't bother with | |
2121 | * all the retry and error correction code that follows. no | |
2122 | * matter what the error is, it is very likely to persist. | |
2123 | */ | |
2124 | pr_debug("bio_readpage_error: cannot repair, num_copies == 1. " | |
2125 | "state=%p, num_copies=%d, next_mirror %d, " | |
2126 | "failed_mirror %d\n", state, num_copies, | |
2127 | failrec->this_mirror, failed_mirror); | |
2128 | free_io_failure(inode, failrec, 0); | |
2129 | return -EIO; | |
2130 | } | |
2131 | ||
2132 | if (!state) { | |
2133 | spin_lock(&tree->lock); | |
2134 | state = find_first_extent_bit_state(tree, failrec->start, | |
2135 | EXTENT_LOCKED); | |
2136 | if (state && state->start != failrec->start) | |
2137 | state = NULL; | |
2138 | spin_unlock(&tree->lock); | |
2139 | } | |
2140 | ||
2141 | /* | |
2142 | * there are two premises: | |
2143 | * a) deliver good data to the caller | |
2144 | * b) correct the bad sectors on disk | |
2145 | */ | |
2146 | if (failed_bio->bi_vcnt > 1) { | |
2147 | /* | |
2148 | * to fulfill b), we need to know the exact failing sectors, as | |
2149 | * we don't want to rewrite any more than the failed ones. thus, | |
2150 | * we need separate read requests for the failed bio | |
2151 | * | |
2152 | * if the following BUG_ON triggers, our validation request got | |
2153 | * merged. we need separate requests for our algorithm to work. | |
2154 | */ | |
2155 | BUG_ON(failrec->in_validation); | |
2156 | failrec->in_validation = 1; | |
2157 | failrec->this_mirror = failed_mirror; | |
2158 | read_mode = READ_SYNC | REQ_FAILFAST_DEV; | |
2159 | } else { | |
2160 | /* | |
2161 | * we're ready to fulfill a) and b) alongside. get a good copy | |
2162 | * of the failed sector and if we succeed, we have setup | |
2163 | * everything for repair_io_failure to do the rest for us. | |
2164 | */ | |
2165 | if (failrec->in_validation) { | |
2166 | BUG_ON(failrec->this_mirror != failed_mirror); | |
2167 | failrec->in_validation = 0; | |
2168 | failrec->this_mirror = 0; | |
2169 | } | |
2170 | failrec->failed_mirror = failed_mirror; | |
2171 | failrec->this_mirror++; | |
2172 | if (failrec->this_mirror == failed_mirror) | |
2173 | failrec->this_mirror++; | |
2174 | read_mode = READ_SYNC; | |
2175 | } | |
2176 | ||
2177 | if (!state || failrec->this_mirror > num_copies) { | |
2178 | pr_debug("bio_readpage_error: (fail) state=%p, num_copies=%d, " | |
2179 | "next_mirror %d, failed_mirror %d\n", state, | |
2180 | num_copies, failrec->this_mirror, failed_mirror); | |
2181 | free_io_failure(inode, failrec, 0); | |
2182 | return -EIO; | |
2183 | } | |
2184 | ||
2185 | bio = bio_alloc(GFP_NOFS, 1); | |
e627ee7b TI |
2186 | if (!bio) { |
2187 | free_io_failure(inode, failrec, 0); | |
2188 | return -EIO; | |
2189 | } | |
4a54c8c1 JS |
2190 | bio->bi_private = state; |
2191 | bio->bi_end_io = failed_bio->bi_end_io; | |
2192 | bio->bi_sector = failrec->logical >> 9; | |
2193 | bio->bi_bdev = BTRFS_I(inode)->root->fs_info->fs_devices->latest_bdev; | |
2194 | bio->bi_size = 0; | |
2195 | ||
2196 | bio_add_page(bio, page, failrec->len, start - page_offset(page)); | |
2197 | ||
2198 | pr_debug("bio_readpage_error: submitting new read[%#x] to " | |
2199 | "this_mirror=%d, num_copies=%d, in_validation=%d\n", read_mode, | |
2200 | failrec->this_mirror, num_copies, failrec->in_validation); | |
2201 | ||
013bd4c3 TI |
2202 | ret = tree->ops->submit_bio_hook(inode, read_mode, bio, |
2203 | failrec->this_mirror, | |
2204 | failrec->bio_flags, 0); | |
2205 | return ret; | |
4a54c8c1 JS |
2206 | } |
2207 | ||
d1310b2e CM |
2208 | /* lots and lots of room for performance fixes in the end_bio funcs */ |
2209 | ||
87826df0 JM |
2210 | int end_extent_writepage(struct page *page, int err, u64 start, u64 end) |
2211 | { | |
2212 | int uptodate = (err == 0); | |
2213 | struct extent_io_tree *tree; | |
2214 | int ret; | |
2215 | ||
2216 | tree = &BTRFS_I(page->mapping->host)->io_tree; | |
2217 | ||
2218 | if (tree->ops && tree->ops->writepage_end_io_hook) { | |
2219 | ret = tree->ops->writepage_end_io_hook(page, start, | |
2220 | end, NULL, uptodate); | |
2221 | if (ret) | |
2222 | uptodate = 0; | |
2223 | } | |
2224 | ||
2225 | if (!uptodate && tree->ops && | |
2226 | tree->ops->writepage_io_failed_hook) { | |
2227 | ret = tree->ops->writepage_io_failed_hook(NULL, page, | |
2228 | start, end, NULL); | |
2229 | /* Writeback already completed */ | |
2230 | if (ret == 0) | |
2231 | return 1; | |
2232 | } | |
2233 | ||
2234 | if (!uptodate) { | |
2235 | clear_extent_uptodate(tree, start, end, NULL, GFP_NOFS); | |
2236 | ClearPageUptodate(page); | |
2237 | SetPageError(page); | |
2238 | } | |
2239 | return 0; | |
2240 | } | |
2241 | ||
d1310b2e CM |
2242 | /* |
2243 | * after a writepage IO is done, we need to: | |
2244 | * clear the uptodate bits on error | |
2245 | * clear the writeback bits in the extent tree for this IO | |
2246 | * end_page_writeback if the page has no more pending IO | |
2247 | * | |
2248 | * Scheduling is not allowed, so the extent state tree is expected | |
2249 | * to have one and only one object corresponding to this IO. | |
2250 | */ | |
d1310b2e | 2251 | static void end_bio_extent_writepage(struct bio *bio, int err) |
d1310b2e | 2252 | { |
d1310b2e | 2253 | struct bio_vec *bvec = bio->bi_io_vec + bio->bi_vcnt - 1; |
902b22f3 | 2254 | struct extent_io_tree *tree; |
d1310b2e CM |
2255 | u64 start; |
2256 | u64 end; | |
2257 | int whole_page; | |
2258 | ||
d1310b2e CM |
2259 | do { |
2260 | struct page *page = bvec->bv_page; | |
902b22f3 DW |
2261 | tree = &BTRFS_I(page->mapping->host)->io_tree; |
2262 | ||
d1310b2e CM |
2263 | start = ((u64)page->index << PAGE_CACHE_SHIFT) + |
2264 | bvec->bv_offset; | |
2265 | end = start + bvec->bv_len - 1; | |
2266 | ||
2267 | if (bvec->bv_offset == 0 && bvec->bv_len == PAGE_CACHE_SIZE) | |
2268 | whole_page = 1; | |
2269 | else | |
2270 | whole_page = 0; | |
2271 | ||
2272 | if (--bvec >= bio->bi_io_vec) | |
2273 | prefetchw(&bvec->bv_page->flags); | |
1259ab75 | 2274 | |
87826df0 JM |
2275 | if (end_extent_writepage(page, err, start, end)) |
2276 | continue; | |
70dec807 | 2277 | |
d1310b2e CM |
2278 | if (whole_page) |
2279 | end_page_writeback(page); | |
2280 | else | |
2281 | check_page_writeback(tree, page); | |
d1310b2e | 2282 | } while (bvec >= bio->bi_io_vec); |
2b1f55b0 | 2283 | |
d1310b2e | 2284 | bio_put(bio); |
d1310b2e CM |
2285 | } |
2286 | ||
2287 | /* | |
2288 | * after a readpage IO is done, we need to: | |
2289 | * clear the uptodate bits on error | |
2290 | * set the uptodate bits if things worked | |
2291 | * set the page up to date if all extents in the tree are uptodate | |
2292 | * clear the lock bit in the extent tree | |
2293 | * unlock the page if there are no other extents locked for it | |
2294 | * | |
2295 | * Scheduling is not allowed, so the extent state tree is expected | |
2296 | * to have one and only one object corresponding to this IO. | |
2297 | */ | |
d1310b2e | 2298 | static void end_bio_extent_readpage(struct bio *bio, int err) |
d1310b2e CM |
2299 | { |
2300 | int uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags); | |
4125bf76 CM |
2301 | struct bio_vec *bvec_end = bio->bi_io_vec + bio->bi_vcnt - 1; |
2302 | struct bio_vec *bvec = bio->bi_io_vec; | |
902b22f3 | 2303 | struct extent_io_tree *tree; |
d1310b2e CM |
2304 | u64 start; |
2305 | u64 end; | |
2306 | int whole_page; | |
ea466794 | 2307 | int failed_mirror; |
d1310b2e CM |
2308 | int ret; |
2309 | ||
d20f7043 CM |
2310 | if (err) |
2311 | uptodate = 0; | |
2312 | ||
d1310b2e CM |
2313 | do { |
2314 | struct page *page = bvec->bv_page; | |
507903b8 AJ |
2315 | struct extent_state *cached = NULL; |
2316 | struct extent_state *state; | |
2317 | ||
4a54c8c1 JS |
2318 | pr_debug("end_bio_extent_readpage: bi_vcnt=%d, idx=%d, err=%d, " |
2319 | "mirror=%ld\n", bio->bi_vcnt, bio->bi_idx, err, | |
2320 | (long int)bio->bi_bdev); | |
902b22f3 DW |
2321 | tree = &BTRFS_I(page->mapping->host)->io_tree; |
2322 | ||
d1310b2e CM |
2323 | start = ((u64)page->index << PAGE_CACHE_SHIFT) + |
2324 | bvec->bv_offset; | |
2325 | end = start + bvec->bv_len - 1; | |
2326 | ||
2327 | if (bvec->bv_offset == 0 && bvec->bv_len == PAGE_CACHE_SIZE) | |
2328 | whole_page = 1; | |
2329 | else | |
2330 | whole_page = 0; | |
2331 | ||
4125bf76 | 2332 | if (++bvec <= bvec_end) |
d1310b2e CM |
2333 | prefetchw(&bvec->bv_page->flags); |
2334 | ||
507903b8 | 2335 | spin_lock(&tree->lock); |
0d399205 | 2336 | state = find_first_extent_bit_state(tree, start, EXTENT_LOCKED); |
109b36a2 | 2337 | if (state && state->start == start) { |
507903b8 AJ |
2338 | /* |
2339 | * take a reference on the state, unlock will drop | |
2340 | * the ref | |
2341 | */ | |
2342 | cache_state(state, &cached); | |
2343 | } | |
2344 | spin_unlock(&tree->lock); | |
2345 | ||
d1310b2e | 2346 | if (uptodate && tree->ops && tree->ops->readpage_end_io_hook) { |
70dec807 | 2347 | ret = tree->ops->readpage_end_io_hook(page, start, end, |
507903b8 | 2348 | state); |
d1310b2e CM |
2349 | if (ret) |
2350 | uptodate = 0; | |
4a54c8c1 JS |
2351 | else |
2352 | clean_io_failure(start, page); | |
d1310b2e | 2353 | } |
ea466794 JB |
2354 | |
2355 | if (!uptodate) | |
32240a91 | 2356 | failed_mirror = (int)(unsigned long)bio->bi_bdev; |
ea466794 JB |
2357 | |
2358 | if (!uptodate && tree->ops && tree->ops->readpage_io_failed_hook) { | |
2359 | ret = tree->ops->readpage_io_failed_hook(page, failed_mirror); | |
2360 | if (!ret && !err && | |
2361 | test_bit(BIO_UPTODATE, &bio->bi_flags)) | |
2362 | uptodate = 1; | |
2363 | } else if (!uptodate) { | |
f4a8e656 JS |
2364 | /* |
2365 | * The generic bio_readpage_error handles errors the | |
2366 | * following way: If possible, new read requests are | |
2367 | * created and submitted and will end up in | |
2368 | * end_bio_extent_readpage as well (if we're lucky, not | |
2369 | * in the !uptodate case). In that case it returns 0 and | |
2370 | * we just go on with the next page in our bio. If it | |
2371 | * can't handle the error it will return -EIO and we | |
2372 | * remain responsible for that page. | |
2373 | */ | |
2374 | ret = bio_readpage_error(bio, page, start, end, | |
2375 | failed_mirror, NULL); | |
7e38326f | 2376 | if (ret == 0) { |
3b951516 CM |
2377 | uptodate = |
2378 | test_bit(BIO_UPTODATE, &bio->bi_flags); | |
d20f7043 CM |
2379 | if (err) |
2380 | uptodate = 0; | |
507903b8 | 2381 | uncache_state(&cached); |
7e38326f CM |
2382 | continue; |
2383 | } | |
2384 | } | |
d1310b2e | 2385 | |
0b32f4bb | 2386 | if (uptodate && tree->track_uptodate) { |
507903b8 | 2387 | set_extent_uptodate(tree, start, end, &cached, |
902b22f3 | 2388 | GFP_ATOMIC); |
771ed689 | 2389 | } |
507903b8 | 2390 | unlock_extent_cached(tree, start, end, &cached, GFP_ATOMIC); |
d1310b2e | 2391 | |
70dec807 CM |
2392 | if (whole_page) { |
2393 | if (uptodate) { | |
2394 | SetPageUptodate(page); | |
2395 | } else { | |
2396 | ClearPageUptodate(page); | |
2397 | SetPageError(page); | |
2398 | } | |
d1310b2e | 2399 | unlock_page(page); |
70dec807 CM |
2400 | } else { |
2401 | if (uptodate) { | |
2402 | check_page_uptodate(tree, page); | |
2403 | } else { | |
2404 | ClearPageUptodate(page); | |
2405 | SetPageError(page); | |
2406 | } | |
d1310b2e | 2407 | check_page_locked(tree, page); |
70dec807 | 2408 | } |
4125bf76 | 2409 | } while (bvec <= bvec_end); |
d1310b2e CM |
2410 | |
2411 | bio_put(bio); | |
d1310b2e CM |
2412 | } |
2413 | ||
88f794ed MX |
2414 | struct bio * |
2415 | btrfs_bio_alloc(struct block_device *bdev, u64 first_sector, int nr_vecs, | |
2416 | gfp_t gfp_flags) | |
d1310b2e CM |
2417 | { |
2418 | struct bio *bio; | |
2419 | ||
2420 | bio = bio_alloc(gfp_flags, nr_vecs); | |
2421 | ||
2422 | if (bio == NULL && (current->flags & PF_MEMALLOC)) { | |
2423 | while (!bio && (nr_vecs /= 2)) | |
2424 | bio = bio_alloc(gfp_flags, nr_vecs); | |
2425 | } | |
2426 | ||
2427 | if (bio) { | |
e1c4b745 | 2428 | bio->bi_size = 0; |
d1310b2e CM |
2429 | bio->bi_bdev = bdev; |
2430 | bio->bi_sector = first_sector; | |
2431 | } | |
2432 | return bio; | |
2433 | } | |
2434 | ||
79787eaa JM |
2435 | /* |
2436 | * Since writes are async, they will only return -ENOMEM. | |
2437 | * Reads can return the full range of I/O error conditions. | |
2438 | */ | |
355808c2 JM |
2439 | static int __must_check submit_one_bio(int rw, struct bio *bio, |
2440 | int mirror_num, unsigned long bio_flags) | |
d1310b2e | 2441 | { |
d1310b2e | 2442 | int ret = 0; |
70dec807 CM |
2443 | struct bio_vec *bvec = bio->bi_io_vec + bio->bi_vcnt - 1; |
2444 | struct page *page = bvec->bv_page; | |
2445 | struct extent_io_tree *tree = bio->bi_private; | |
70dec807 | 2446 | u64 start; |
70dec807 CM |
2447 | |
2448 | start = ((u64)page->index << PAGE_CACHE_SHIFT) + bvec->bv_offset; | |
70dec807 | 2449 | |
902b22f3 | 2450 | bio->bi_private = NULL; |
d1310b2e CM |
2451 | |
2452 | bio_get(bio); | |
2453 | ||
065631f6 | 2454 | if (tree->ops && tree->ops->submit_bio_hook) |
6b82ce8d | 2455 | ret = tree->ops->submit_bio_hook(page->mapping->host, rw, bio, |
eaf25d93 | 2456 | mirror_num, bio_flags, start); |
0b86a832 | 2457 | else |
21adbd5c | 2458 | btrfsic_submit_bio(rw, bio); |
4a54c8c1 | 2459 | |
d1310b2e CM |
2460 | if (bio_flagged(bio, BIO_EOPNOTSUPP)) |
2461 | ret = -EOPNOTSUPP; | |
2462 | bio_put(bio); | |
2463 | return ret; | |
2464 | } | |
2465 | ||
3444a972 JM |
2466 | static int merge_bio(struct extent_io_tree *tree, struct page *page, |
2467 | unsigned long offset, size_t size, struct bio *bio, | |
2468 | unsigned long bio_flags) | |
2469 | { | |
2470 | int ret = 0; | |
2471 | if (tree->ops && tree->ops->merge_bio_hook) | |
2472 | ret = tree->ops->merge_bio_hook(page, offset, size, bio, | |
2473 | bio_flags); | |
2474 | BUG_ON(ret < 0); | |
2475 | return ret; | |
2476 | ||
2477 | } | |
2478 | ||
d1310b2e CM |
2479 | static int submit_extent_page(int rw, struct extent_io_tree *tree, |
2480 | struct page *page, sector_t sector, | |
2481 | size_t size, unsigned long offset, | |
2482 | struct block_device *bdev, | |
2483 | struct bio **bio_ret, | |
2484 | unsigned long max_pages, | |
f188591e | 2485 | bio_end_io_t end_io_func, |
c8b97818 CM |
2486 | int mirror_num, |
2487 | unsigned long prev_bio_flags, | |
2488 | unsigned long bio_flags) | |
d1310b2e CM |
2489 | { |
2490 | int ret = 0; | |
2491 | struct bio *bio; | |
2492 | int nr; | |
c8b97818 CM |
2493 | int contig = 0; |
2494 | int this_compressed = bio_flags & EXTENT_BIO_COMPRESSED; | |
2495 | int old_compressed = prev_bio_flags & EXTENT_BIO_COMPRESSED; | |
5b050f04 | 2496 | size_t page_size = min_t(size_t, size, PAGE_CACHE_SIZE); |
d1310b2e CM |
2497 | |
2498 | if (bio_ret && *bio_ret) { | |
2499 | bio = *bio_ret; | |
c8b97818 CM |
2500 | if (old_compressed) |
2501 | contig = bio->bi_sector == sector; | |
2502 | else | |
2503 | contig = bio->bi_sector + (bio->bi_size >> 9) == | |
2504 | sector; | |
2505 | ||
2506 | if (prev_bio_flags != bio_flags || !contig || | |
3444a972 | 2507 | merge_bio(tree, page, offset, page_size, bio, bio_flags) || |
c8b97818 CM |
2508 | bio_add_page(bio, page, page_size, offset) < page_size) { |
2509 | ret = submit_one_bio(rw, bio, mirror_num, | |
2510 | prev_bio_flags); | |
79787eaa JM |
2511 | if (ret < 0) |
2512 | return ret; | |
d1310b2e CM |
2513 | bio = NULL; |
2514 | } else { | |
2515 | return 0; | |
2516 | } | |
2517 | } | |
c8b97818 CM |
2518 | if (this_compressed) |
2519 | nr = BIO_MAX_PAGES; | |
2520 | else | |
2521 | nr = bio_get_nr_vecs(bdev); | |
2522 | ||
88f794ed | 2523 | bio = btrfs_bio_alloc(bdev, sector, nr, GFP_NOFS | __GFP_HIGH); |
5df67083 TI |
2524 | if (!bio) |
2525 | return -ENOMEM; | |
70dec807 | 2526 | |
c8b97818 | 2527 | bio_add_page(bio, page, page_size, offset); |
d1310b2e CM |
2528 | bio->bi_end_io = end_io_func; |
2529 | bio->bi_private = tree; | |
70dec807 | 2530 | |
d397712b | 2531 | if (bio_ret) |
d1310b2e | 2532 | *bio_ret = bio; |
d397712b | 2533 | else |
c8b97818 | 2534 | ret = submit_one_bio(rw, bio, mirror_num, bio_flags); |
d1310b2e CM |
2535 | |
2536 | return ret; | |
2537 | } | |
2538 | ||
4f2de97a | 2539 | void attach_extent_buffer_page(struct extent_buffer *eb, struct page *page) |
d1310b2e CM |
2540 | { |
2541 | if (!PagePrivate(page)) { | |
2542 | SetPagePrivate(page); | |
d1310b2e | 2543 | page_cache_get(page); |
4f2de97a JB |
2544 | set_page_private(page, (unsigned long)eb); |
2545 | } else { | |
2546 | WARN_ON(page->private != (unsigned long)eb); | |
d1310b2e CM |
2547 | } |
2548 | } | |
2549 | ||
4f2de97a | 2550 | void set_page_extent_mapped(struct page *page) |
d1310b2e | 2551 | { |
4f2de97a JB |
2552 | if (!PagePrivate(page)) { |
2553 | SetPagePrivate(page); | |
2554 | page_cache_get(page); | |
2555 | set_page_private(page, EXTENT_PAGE_PRIVATE); | |
2556 | } | |
d1310b2e CM |
2557 | } |
2558 | ||
2559 | /* | |
2560 | * basic readpage implementation. Locked extent state structs are inserted | |
2561 | * into the tree that are removed when the IO is done (by the end_io | |
2562 | * handlers) | |
79787eaa | 2563 | * XXX JDM: This needs looking at to ensure proper page locking |
d1310b2e CM |
2564 | */ |
2565 | static int __extent_read_full_page(struct extent_io_tree *tree, | |
2566 | struct page *page, | |
2567 | get_extent_t *get_extent, | |
c8b97818 CM |
2568 | struct bio **bio, int mirror_num, |
2569 | unsigned long *bio_flags) | |
d1310b2e CM |
2570 | { |
2571 | struct inode *inode = page->mapping->host; | |
2572 | u64 start = (u64)page->index << PAGE_CACHE_SHIFT; | |
2573 | u64 page_end = start + PAGE_CACHE_SIZE - 1; | |
2574 | u64 end; | |
2575 | u64 cur = start; | |
2576 | u64 extent_offset; | |
2577 | u64 last_byte = i_size_read(inode); | |
2578 | u64 block_start; | |
2579 | u64 cur_end; | |
2580 | sector_t sector; | |
2581 | struct extent_map *em; | |
2582 | struct block_device *bdev; | |
11c65dcc | 2583 | struct btrfs_ordered_extent *ordered; |
d1310b2e CM |
2584 | int ret; |
2585 | int nr = 0; | |
306e16ce | 2586 | size_t pg_offset = 0; |
d1310b2e | 2587 | size_t iosize; |
c8b97818 | 2588 | size_t disk_io_size; |
d1310b2e | 2589 | size_t blocksize = inode->i_sb->s_blocksize; |
c8b97818 | 2590 | unsigned long this_bio_flag = 0; |
d1310b2e CM |
2591 | |
2592 | set_page_extent_mapped(page); | |
2593 | ||
90a887c9 DM |
2594 | if (!PageUptodate(page)) { |
2595 | if (cleancache_get_page(page) == 0) { | |
2596 | BUG_ON(blocksize != PAGE_SIZE); | |
2597 | goto out; | |
2598 | } | |
2599 | } | |
2600 | ||
d1310b2e | 2601 | end = page_end; |
11c65dcc | 2602 | while (1) { |
d0082371 | 2603 | lock_extent(tree, start, end); |
11c65dcc JB |
2604 | ordered = btrfs_lookup_ordered_extent(inode, start); |
2605 | if (!ordered) | |
2606 | break; | |
d0082371 | 2607 | unlock_extent(tree, start, end); |
11c65dcc JB |
2608 | btrfs_start_ordered_extent(inode, ordered, 1); |
2609 | btrfs_put_ordered_extent(ordered); | |
2610 | } | |
d1310b2e | 2611 | |
c8b97818 CM |
2612 | if (page->index == last_byte >> PAGE_CACHE_SHIFT) { |
2613 | char *userpage; | |
2614 | size_t zero_offset = last_byte & (PAGE_CACHE_SIZE - 1); | |
2615 | ||
2616 | if (zero_offset) { | |
2617 | iosize = PAGE_CACHE_SIZE - zero_offset; | |
2618 | userpage = kmap_atomic(page, KM_USER0); | |
2619 | memset(userpage + zero_offset, 0, iosize); | |
2620 | flush_dcache_page(page); | |
2621 | kunmap_atomic(userpage, KM_USER0); | |
2622 | } | |
2623 | } | |
d1310b2e CM |
2624 | while (cur <= end) { |
2625 | if (cur >= last_byte) { | |
2626 | char *userpage; | |
507903b8 AJ |
2627 | struct extent_state *cached = NULL; |
2628 | ||
306e16ce | 2629 | iosize = PAGE_CACHE_SIZE - pg_offset; |
d1310b2e | 2630 | userpage = kmap_atomic(page, KM_USER0); |
306e16ce | 2631 | memset(userpage + pg_offset, 0, iosize); |
d1310b2e CM |
2632 | flush_dcache_page(page); |
2633 | kunmap_atomic(userpage, KM_USER0); | |
2634 | set_extent_uptodate(tree, cur, cur + iosize - 1, | |
507903b8 AJ |
2635 | &cached, GFP_NOFS); |
2636 | unlock_extent_cached(tree, cur, cur + iosize - 1, | |
2637 | &cached, GFP_NOFS); | |
d1310b2e CM |
2638 | break; |
2639 | } | |
306e16ce | 2640 | em = get_extent(inode, page, pg_offset, cur, |
d1310b2e | 2641 | end - cur + 1, 0); |
c704005d | 2642 | if (IS_ERR_OR_NULL(em)) { |
d1310b2e | 2643 | SetPageError(page); |
d0082371 | 2644 | unlock_extent(tree, cur, end); |
d1310b2e CM |
2645 | break; |
2646 | } | |
d1310b2e CM |
2647 | extent_offset = cur - em->start; |
2648 | BUG_ON(extent_map_end(em) <= cur); | |
2649 | BUG_ON(end < cur); | |
2650 | ||
261507a0 | 2651 | if (test_bit(EXTENT_FLAG_COMPRESSED, &em->flags)) { |
c8b97818 | 2652 | this_bio_flag = EXTENT_BIO_COMPRESSED; |
261507a0 LZ |
2653 | extent_set_compress_type(&this_bio_flag, |
2654 | em->compress_type); | |
2655 | } | |
c8b97818 | 2656 | |
d1310b2e CM |
2657 | iosize = min(extent_map_end(em) - cur, end - cur + 1); |
2658 | cur_end = min(extent_map_end(em) - 1, end); | |
2659 | iosize = (iosize + blocksize - 1) & ~((u64)blocksize - 1); | |
c8b97818 CM |
2660 | if (this_bio_flag & EXTENT_BIO_COMPRESSED) { |
2661 | disk_io_size = em->block_len; | |
2662 | sector = em->block_start >> 9; | |
2663 | } else { | |
2664 | sector = (em->block_start + extent_offset) >> 9; | |
2665 | disk_io_size = iosize; | |
2666 | } | |
d1310b2e CM |
2667 | bdev = em->bdev; |
2668 | block_start = em->block_start; | |
d899e052 YZ |
2669 | if (test_bit(EXTENT_FLAG_PREALLOC, &em->flags)) |
2670 | block_start = EXTENT_MAP_HOLE; | |
d1310b2e CM |
2671 | free_extent_map(em); |
2672 | em = NULL; | |
2673 | ||
2674 | /* we've found a hole, just zero and go on */ | |
2675 | if (block_start == EXTENT_MAP_HOLE) { | |
2676 | char *userpage; | |
507903b8 AJ |
2677 | struct extent_state *cached = NULL; |
2678 | ||
d1310b2e | 2679 | userpage = kmap_atomic(page, KM_USER0); |
306e16ce | 2680 | memset(userpage + pg_offset, 0, iosize); |
d1310b2e CM |
2681 | flush_dcache_page(page); |
2682 | kunmap_atomic(userpage, KM_USER0); | |
2683 | ||
2684 | set_extent_uptodate(tree, cur, cur + iosize - 1, | |
507903b8 AJ |
2685 | &cached, GFP_NOFS); |
2686 | unlock_extent_cached(tree, cur, cur + iosize - 1, | |
2687 | &cached, GFP_NOFS); | |
d1310b2e | 2688 | cur = cur + iosize; |
306e16ce | 2689 | pg_offset += iosize; |
d1310b2e CM |
2690 | continue; |
2691 | } | |
2692 | /* the get_extent function already copied into the page */ | |
9655d298 CM |
2693 | if (test_range_bit(tree, cur, cur_end, |
2694 | EXTENT_UPTODATE, 1, NULL)) { | |
a1b32a59 | 2695 | check_page_uptodate(tree, page); |
d0082371 | 2696 | unlock_extent(tree, cur, cur + iosize - 1); |
d1310b2e | 2697 | cur = cur + iosize; |
306e16ce | 2698 | pg_offset += iosize; |
d1310b2e CM |
2699 | continue; |
2700 | } | |
70dec807 CM |
2701 | /* we have an inline extent but it didn't get marked up |
2702 | * to date. Error out | |
2703 | */ | |
2704 | if (block_start == EXTENT_MAP_INLINE) { | |
2705 | SetPageError(page); | |
d0082371 | 2706 | unlock_extent(tree, cur, cur + iosize - 1); |
70dec807 | 2707 | cur = cur + iosize; |
306e16ce | 2708 | pg_offset += iosize; |
70dec807 CM |
2709 | continue; |
2710 | } | |
d1310b2e CM |
2711 | |
2712 | ret = 0; | |
2713 | if (tree->ops && tree->ops->readpage_io_hook) { | |
2714 | ret = tree->ops->readpage_io_hook(page, cur, | |
2715 | cur + iosize - 1); | |
2716 | } | |
2717 | if (!ret) { | |
89642229 CM |
2718 | unsigned long pnr = (last_byte >> PAGE_CACHE_SHIFT) + 1; |
2719 | pnr -= page->index; | |
d1310b2e | 2720 | ret = submit_extent_page(READ, tree, page, |
306e16ce | 2721 | sector, disk_io_size, pg_offset, |
89642229 | 2722 | bdev, bio, pnr, |
c8b97818 CM |
2723 | end_bio_extent_readpage, mirror_num, |
2724 | *bio_flags, | |
2725 | this_bio_flag); | |
79787eaa | 2726 | BUG_ON(ret == -ENOMEM); |
89642229 | 2727 | nr++; |
c8b97818 | 2728 | *bio_flags = this_bio_flag; |
d1310b2e CM |
2729 | } |
2730 | if (ret) | |
2731 | SetPageError(page); | |
2732 | cur = cur + iosize; | |
306e16ce | 2733 | pg_offset += iosize; |
d1310b2e | 2734 | } |
90a887c9 | 2735 | out: |
d1310b2e CM |
2736 | if (!nr) { |
2737 | if (!PageError(page)) | |
2738 | SetPageUptodate(page); | |
2739 | unlock_page(page); | |
2740 | } | |
2741 | return 0; | |
2742 | } | |
2743 | ||
2744 | int extent_read_full_page(struct extent_io_tree *tree, struct page *page, | |
8ddc7d9c | 2745 | get_extent_t *get_extent, int mirror_num) |
d1310b2e CM |
2746 | { |
2747 | struct bio *bio = NULL; | |
c8b97818 | 2748 | unsigned long bio_flags = 0; |
d1310b2e CM |
2749 | int ret; |
2750 | ||
8ddc7d9c | 2751 | ret = __extent_read_full_page(tree, page, get_extent, &bio, mirror_num, |
c8b97818 | 2752 | &bio_flags); |
d1310b2e | 2753 | if (bio) |
8ddc7d9c | 2754 | ret = submit_one_bio(READ, bio, mirror_num, bio_flags); |
d1310b2e CM |
2755 | return ret; |
2756 | } | |
d1310b2e | 2757 | |
11c8349b CM |
2758 | static noinline void update_nr_written(struct page *page, |
2759 | struct writeback_control *wbc, | |
2760 | unsigned long nr_written) | |
2761 | { | |
2762 | wbc->nr_to_write -= nr_written; | |
2763 | if (wbc->range_cyclic || (wbc->nr_to_write > 0 && | |
2764 | wbc->range_start == 0 && wbc->range_end == LLONG_MAX)) | |
2765 | page->mapping->writeback_index = page->index + nr_written; | |
2766 | } | |
2767 | ||
d1310b2e CM |
2768 | /* |
2769 | * the writepage semantics are similar to regular writepage. extent | |
2770 | * records are inserted to lock ranges in the tree, and as dirty areas | |
2771 | * are found, they are marked writeback. Then the lock bits are removed | |
2772 | * and the end_io handler clears the writeback ranges | |
2773 | */ | |
2774 | static int __extent_writepage(struct page *page, struct writeback_control *wbc, | |
2775 | void *data) | |
2776 | { | |
2777 | struct inode *inode = page->mapping->host; | |
2778 | struct extent_page_data *epd = data; | |
2779 | struct extent_io_tree *tree = epd->tree; | |
2780 | u64 start = (u64)page->index << PAGE_CACHE_SHIFT; | |
2781 | u64 delalloc_start; | |
2782 | u64 page_end = start + PAGE_CACHE_SIZE - 1; | |
2783 | u64 end; | |
2784 | u64 cur = start; | |
2785 | u64 extent_offset; | |
2786 | u64 last_byte = i_size_read(inode); | |
2787 | u64 block_start; | |
2788 | u64 iosize; | |
2789 | sector_t sector; | |
2c64c53d | 2790 | struct extent_state *cached_state = NULL; |
d1310b2e CM |
2791 | struct extent_map *em; |
2792 | struct block_device *bdev; | |
2793 | int ret; | |
2794 | int nr = 0; | |
7f3c74fb | 2795 | size_t pg_offset = 0; |
d1310b2e CM |
2796 | size_t blocksize; |
2797 | loff_t i_size = i_size_read(inode); | |
2798 | unsigned long end_index = i_size >> PAGE_CACHE_SHIFT; | |
2799 | u64 nr_delalloc; | |
2800 | u64 delalloc_end; | |
c8b97818 CM |
2801 | int page_started; |
2802 | int compressed; | |
ffbd517d | 2803 | int write_flags; |
771ed689 | 2804 | unsigned long nr_written = 0; |
9e487107 | 2805 | bool fill_delalloc = true; |
d1310b2e | 2806 | |
ffbd517d | 2807 | if (wbc->sync_mode == WB_SYNC_ALL) |
721a9602 | 2808 | write_flags = WRITE_SYNC; |
ffbd517d CM |
2809 | else |
2810 | write_flags = WRITE; | |
2811 | ||
1abe9b8a | 2812 | trace___extent_writepage(page, inode, wbc); |
2813 | ||
d1310b2e | 2814 | WARN_ON(!PageLocked(page)); |
bf0da8c1 CM |
2815 | |
2816 | ClearPageError(page); | |
2817 | ||
7f3c74fb | 2818 | pg_offset = i_size & (PAGE_CACHE_SIZE - 1); |
211c17f5 | 2819 | if (page->index > end_index || |
7f3c74fb | 2820 | (page->index == end_index && !pg_offset)) { |
39be25cd | 2821 | page->mapping->a_ops->invalidatepage(page, 0); |
d1310b2e CM |
2822 | unlock_page(page); |
2823 | return 0; | |
2824 | } | |
2825 | ||
2826 | if (page->index == end_index) { | |
2827 | char *userpage; | |
2828 | ||
d1310b2e | 2829 | userpage = kmap_atomic(page, KM_USER0); |
7f3c74fb CM |
2830 | memset(userpage + pg_offset, 0, |
2831 | PAGE_CACHE_SIZE - pg_offset); | |
d1310b2e | 2832 | kunmap_atomic(userpage, KM_USER0); |
211c17f5 | 2833 | flush_dcache_page(page); |
d1310b2e | 2834 | } |
7f3c74fb | 2835 | pg_offset = 0; |
d1310b2e CM |
2836 | |
2837 | set_page_extent_mapped(page); | |
2838 | ||
9e487107 JB |
2839 | if (!tree->ops || !tree->ops->fill_delalloc) |
2840 | fill_delalloc = false; | |
2841 | ||
d1310b2e CM |
2842 | delalloc_start = start; |
2843 | delalloc_end = 0; | |
c8b97818 | 2844 | page_started = 0; |
9e487107 | 2845 | if (!epd->extent_locked && fill_delalloc) { |
f85d7d6c | 2846 | u64 delalloc_to_write = 0; |
11c8349b CM |
2847 | /* |
2848 | * make sure the wbc mapping index is at least updated | |
2849 | * to this page. | |
2850 | */ | |
2851 | update_nr_written(page, wbc, 0); | |
2852 | ||
d397712b | 2853 | while (delalloc_end < page_end) { |
771ed689 | 2854 | nr_delalloc = find_lock_delalloc_range(inode, tree, |
c8b97818 CM |
2855 | page, |
2856 | &delalloc_start, | |
d1310b2e CM |
2857 | &delalloc_end, |
2858 | 128 * 1024 * 1024); | |
771ed689 CM |
2859 | if (nr_delalloc == 0) { |
2860 | delalloc_start = delalloc_end + 1; | |
2861 | continue; | |
2862 | } | |
013bd4c3 TI |
2863 | ret = tree->ops->fill_delalloc(inode, page, |
2864 | delalloc_start, | |
2865 | delalloc_end, | |
2866 | &page_started, | |
2867 | &nr_written); | |
79787eaa JM |
2868 | /* File system has been set read-only */ |
2869 | if (ret) { | |
2870 | SetPageError(page); | |
2871 | goto done; | |
2872 | } | |
f85d7d6c CM |
2873 | /* |
2874 | * delalloc_end is already one less than the total | |
2875 | * length, so we don't subtract one from | |
2876 | * PAGE_CACHE_SIZE | |
2877 | */ | |
2878 | delalloc_to_write += (delalloc_end - delalloc_start + | |
2879 | PAGE_CACHE_SIZE) >> | |
2880 | PAGE_CACHE_SHIFT; | |
d1310b2e | 2881 | delalloc_start = delalloc_end + 1; |
d1310b2e | 2882 | } |
f85d7d6c CM |
2883 | if (wbc->nr_to_write < delalloc_to_write) { |
2884 | int thresh = 8192; | |
2885 | ||
2886 | if (delalloc_to_write < thresh * 2) | |
2887 | thresh = delalloc_to_write; | |
2888 | wbc->nr_to_write = min_t(u64, delalloc_to_write, | |
2889 | thresh); | |
2890 | } | |
c8b97818 | 2891 | |
771ed689 CM |
2892 | /* did the fill delalloc function already unlock and start |
2893 | * the IO? | |
2894 | */ | |
2895 | if (page_started) { | |
2896 | ret = 0; | |
11c8349b CM |
2897 | /* |
2898 | * we've unlocked the page, so we can't update | |
2899 | * the mapping's writeback index, just update | |
2900 | * nr_to_write. | |
2901 | */ | |
2902 | wbc->nr_to_write -= nr_written; | |
2903 | goto done_unlocked; | |
771ed689 | 2904 | } |
c8b97818 | 2905 | } |
247e743c | 2906 | if (tree->ops && tree->ops->writepage_start_hook) { |
c8b97818 CM |
2907 | ret = tree->ops->writepage_start_hook(page, start, |
2908 | page_end); | |
87826df0 JM |
2909 | if (ret) { |
2910 | /* Fixup worker will requeue */ | |
2911 | if (ret == -EBUSY) | |
2912 | wbc->pages_skipped++; | |
2913 | else | |
2914 | redirty_page_for_writepage(wbc, page); | |
11c8349b | 2915 | update_nr_written(page, wbc, nr_written); |
247e743c | 2916 | unlock_page(page); |
771ed689 | 2917 | ret = 0; |
11c8349b | 2918 | goto done_unlocked; |
247e743c CM |
2919 | } |
2920 | } | |
2921 | ||
11c8349b CM |
2922 | /* |
2923 | * we don't want to touch the inode after unlocking the page, | |
2924 | * so we update the mapping writeback index now | |
2925 | */ | |
2926 | update_nr_written(page, wbc, nr_written + 1); | |
771ed689 | 2927 | |
d1310b2e | 2928 | end = page_end; |
d1310b2e | 2929 | if (last_byte <= start) { |
e6dcd2dc CM |
2930 | if (tree->ops && tree->ops->writepage_end_io_hook) |
2931 | tree->ops->writepage_end_io_hook(page, start, | |
2932 | page_end, NULL, 1); | |
d1310b2e CM |
2933 | goto done; |
2934 | } | |
2935 | ||
d1310b2e CM |
2936 | blocksize = inode->i_sb->s_blocksize; |
2937 | ||
2938 | while (cur <= end) { | |
2939 | if (cur >= last_byte) { | |
e6dcd2dc CM |
2940 | if (tree->ops && tree->ops->writepage_end_io_hook) |
2941 | tree->ops->writepage_end_io_hook(page, cur, | |
2942 | page_end, NULL, 1); | |
d1310b2e CM |
2943 | break; |
2944 | } | |
7f3c74fb | 2945 | em = epd->get_extent(inode, page, pg_offset, cur, |
d1310b2e | 2946 | end - cur + 1, 1); |
c704005d | 2947 | if (IS_ERR_OR_NULL(em)) { |
d1310b2e CM |
2948 | SetPageError(page); |
2949 | break; | |
2950 | } | |
2951 | ||
2952 | extent_offset = cur - em->start; | |
2953 | BUG_ON(extent_map_end(em) <= cur); | |
2954 | BUG_ON(end < cur); | |
2955 | iosize = min(extent_map_end(em) - cur, end - cur + 1); | |
2956 | iosize = (iosize + blocksize - 1) & ~((u64)blocksize - 1); | |
2957 | sector = (em->block_start + extent_offset) >> 9; | |
2958 | bdev = em->bdev; | |
2959 | block_start = em->block_start; | |
c8b97818 | 2960 | compressed = test_bit(EXTENT_FLAG_COMPRESSED, &em->flags); |
d1310b2e CM |
2961 | free_extent_map(em); |
2962 | em = NULL; | |
2963 | ||
c8b97818 CM |
2964 | /* |
2965 | * compressed and inline extents are written through other | |
2966 | * paths in the FS | |
2967 | */ | |
2968 | if (compressed || block_start == EXTENT_MAP_HOLE || | |
d1310b2e | 2969 | block_start == EXTENT_MAP_INLINE) { |
c8b97818 CM |
2970 | /* |
2971 | * end_io notification does not happen here for | |
2972 | * compressed extents | |
2973 | */ | |
2974 | if (!compressed && tree->ops && | |
2975 | tree->ops->writepage_end_io_hook) | |
e6dcd2dc CM |
2976 | tree->ops->writepage_end_io_hook(page, cur, |
2977 | cur + iosize - 1, | |
2978 | NULL, 1); | |
c8b97818 CM |
2979 | else if (compressed) { |
2980 | /* we don't want to end_page_writeback on | |
2981 | * a compressed extent. this happens | |
2982 | * elsewhere | |
2983 | */ | |
2984 | nr++; | |
2985 | } | |
2986 | ||
2987 | cur += iosize; | |
7f3c74fb | 2988 | pg_offset += iosize; |
d1310b2e CM |
2989 | continue; |
2990 | } | |
d1310b2e CM |
2991 | /* leave this out until we have a page_mkwrite call */ |
2992 | if (0 && !test_range_bit(tree, cur, cur + iosize - 1, | |
9655d298 | 2993 | EXTENT_DIRTY, 0, NULL)) { |
d1310b2e | 2994 | cur = cur + iosize; |
7f3c74fb | 2995 | pg_offset += iosize; |
d1310b2e CM |
2996 | continue; |
2997 | } | |
c8b97818 | 2998 | |
d1310b2e CM |
2999 | if (tree->ops && tree->ops->writepage_io_hook) { |
3000 | ret = tree->ops->writepage_io_hook(page, cur, | |
3001 | cur + iosize - 1); | |
3002 | } else { | |
3003 | ret = 0; | |
3004 | } | |
1259ab75 | 3005 | if (ret) { |
d1310b2e | 3006 | SetPageError(page); |
1259ab75 | 3007 | } else { |
d1310b2e | 3008 | unsigned long max_nr = end_index + 1; |
7f3c74fb | 3009 | |
d1310b2e CM |
3010 | set_range_writeback(tree, cur, cur + iosize - 1); |
3011 | if (!PageWriteback(page)) { | |
d397712b CM |
3012 | printk(KERN_ERR "btrfs warning page %lu not " |
3013 | "writeback, cur %llu end %llu\n", | |
3014 | page->index, (unsigned long long)cur, | |
d1310b2e CM |
3015 | (unsigned long long)end); |
3016 | } | |
3017 | ||
ffbd517d CM |
3018 | ret = submit_extent_page(write_flags, tree, page, |
3019 | sector, iosize, pg_offset, | |
3020 | bdev, &epd->bio, max_nr, | |
c8b97818 CM |
3021 | end_bio_extent_writepage, |
3022 | 0, 0, 0); | |
d1310b2e CM |
3023 | if (ret) |
3024 | SetPageError(page); | |
3025 | } | |
3026 | cur = cur + iosize; | |
7f3c74fb | 3027 | pg_offset += iosize; |
d1310b2e CM |
3028 | nr++; |
3029 | } | |
3030 | done: | |
3031 | if (nr == 0) { | |
3032 | /* make sure the mapping tag for page dirty gets cleared */ | |
3033 | set_page_writeback(page); | |
3034 | end_page_writeback(page); | |
3035 | } | |
d1310b2e | 3036 | unlock_page(page); |
771ed689 | 3037 | |
11c8349b CM |
3038 | done_unlocked: |
3039 | ||
2c64c53d CM |
3040 | /* drop our reference on any cached states */ |
3041 | free_extent_state(cached_state); | |
d1310b2e CM |
3042 | return 0; |
3043 | } | |
3044 | ||
0b32f4bb JB |
3045 | static int eb_wait(void *word) |
3046 | { | |
3047 | io_schedule(); | |
3048 | return 0; | |
3049 | } | |
3050 | ||
3051 | static void wait_on_extent_buffer_writeback(struct extent_buffer *eb) | |
3052 | { | |
3053 | wait_on_bit(&eb->bflags, EXTENT_BUFFER_WRITEBACK, eb_wait, | |
3054 | TASK_UNINTERRUPTIBLE); | |
3055 | } | |
3056 | ||
3057 | static int lock_extent_buffer_for_io(struct extent_buffer *eb, | |
3058 | struct btrfs_fs_info *fs_info, | |
3059 | struct extent_page_data *epd) | |
3060 | { | |
3061 | unsigned long i, num_pages; | |
3062 | int flush = 0; | |
3063 | int ret = 0; | |
3064 | ||
3065 | if (!btrfs_try_tree_write_lock(eb)) { | |
3066 | flush = 1; | |
3067 | flush_write_bio(epd); | |
3068 | btrfs_tree_lock(eb); | |
3069 | } | |
3070 | ||
3071 | if (test_bit(EXTENT_BUFFER_WRITEBACK, &eb->bflags)) { | |
3072 | btrfs_tree_unlock(eb); | |
3073 | if (!epd->sync_io) | |
3074 | return 0; | |
3075 | if (!flush) { | |
3076 | flush_write_bio(epd); | |
3077 | flush = 1; | |
3078 | } | |
a098d8e8 CM |
3079 | while (1) { |
3080 | wait_on_extent_buffer_writeback(eb); | |
3081 | btrfs_tree_lock(eb); | |
3082 | if (!test_bit(EXTENT_BUFFER_WRITEBACK, &eb->bflags)) | |
3083 | break; | |
0b32f4bb | 3084 | btrfs_tree_unlock(eb); |
0b32f4bb JB |
3085 | } |
3086 | } | |
3087 | ||
3088 | if (test_and_clear_bit(EXTENT_BUFFER_DIRTY, &eb->bflags)) { | |
3089 | set_bit(EXTENT_BUFFER_WRITEBACK, &eb->bflags); | |
3090 | btrfs_set_header_flag(eb, BTRFS_HEADER_FLAG_WRITTEN); | |
3091 | spin_lock(&fs_info->delalloc_lock); | |
3092 | if (fs_info->dirty_metadata_bytes >= eb->len) | |
3093 | fs_info->dirty_metadata_bytes -= eb->len; | |
3094 | else | |
3095 | WARN_ON(1); | |
3096 | spin_unlock(&fs_info->delalloc_lock); | |
3097 | ret = 1; | |
3098 | } | |
3099 | ||
3100 | btrfs_tree_unlock(eb); | |
3101 | ||
3102 | if (!ret) | |
3103 | return ret; | |
3104 | ||
3105 | num_pages = num_extent_pages(eb->start, eb->len); | |
3106 | for (i = 0; i < num_pages; i++) { | |
3107 | struct page *p = extent_buffer_page(eb, i); | |
3108 | ||
3109 | if (!trylock_page(p)) { | |
3110 | if (!flush) { | |
3111 | flush_write_bio(epd); | |
3112 | flush = 1; | |
3113 | } | |
3114 | lock_page(p); | |
3115 | } | |
3116 | } | |
3117 | ||
3118 | return ret; | |
3119 | } | |
3120 | ||
3121 | static void end_extent_buffer_writeback(struct extent_buffer *eb) | |
3122 | { | |
3123 | clear_bit(EXTENT_BUFFER_WRITEBACK, &eb->bflags); | |
3124 | smp_mb__after_clear_bit(); | |
3125 | wake_up_bit(&eb->bflags, EXTENT_BUFFER_WRITEBACK); | |
3126 | } | |
3127 | ||
3128 | static void end_bio_extent_buffer_writepage(struct bio *bio, int err) | |
3129 | { | |
3130 | int uptodate = err == 0; | |
3131 | struct bio_vec *bvec = bio->bi_io_vec + bio->bi_vcnt - 1; | |
3132 | struct extent_buffer *eb; | |
3133 | int done; | |
3134 | ||
3135 | do { | |
3136 | struct page *page = bvec->bv_page; | |
3137 | ||
3138 | bvec--; | |
3139 | eb = (struct extent_buffer *)page->private; | |
3140 | BUG_ON(!eb); | |
3141 | done = atomic_dec_and_test(&eb->io_pages); | |
3142 | ||
3143 | if (!uptodate || test_bit(EXTENT_BUFFER_IOERR, &eb->bflags)) { | |
3144 | set_bit(EXTENT_BUFFER_IOERR, &eb->bflags); | |
3145 | ClearPageUptodate(page); | |
3146 | SetPageError(page); | |
3147 | } | |
3148 | ||
3149 | end_page_writeback(page); | |
3150 | ||
3151 | if (!done) | |
3152 | continue; | |
3153 | ||
3154 | end_extent_buffer_writeback(eb); | |
3155 | } while (bvec >= bio->bi_io_vec); | |
3156 | ||
3157 | bio_put(bio); | |
3158 | ||
3159 | } | |
3160 | ||
3161 | static int write_one_eb(struct extent_buffer *eb, | |
3162 | struct btrfs_fs_info *fs_info, | |
3163 | struct writeback_control *wbc, | |
3164 | struct extent_page_data *epd) | |
3165 | { | |
3166 | struct block_device *bdev = fs_info->fs_devices->latest_bdev; | |
3167 | u64 offset = eb->start; | |
3168 | unsigned long i, num_pages; | |
3169 | int rw = (epd->sync_io ? WRITE_SYNC : WRITE); | |
3170 | int ret; | |
3171 | ||
3172 | clear_bit(EXTENT_BUFFER_IOERR, &eb->bflags); | |
3173 | num_pages = num_extent_pages(eb->start, eb->len); | |
3174 | atomic_set(&eb->io_pages, num_pages); | |
3175 | for (i = 0; i < num_pages; i++) { | |
3176 | struct page *p = extent_buffer_page(eb, i); | |
3177 | ||
3178 | clear_page_dirty_for_io(p); | |
3179 | set_page_writeback(p); | |
3180 | ret = submit_extent_page(rw, eb->tree, p, offset >> 9, | |
3181 | PAGE_CACHE_SIZE, 0, bdev, &epd->bio, | |
3182 | -1, end_bio_extent_buffer_writepage, | |
3183 | 0, 0, 0); | |
3184 | if (ret) { | |
3185 | set_bit(EXTENT_BUFFER_IOERR, &eb->bflags); | |
3186 | SetPageError(p); | |
3187 | if (atomic_sub_and_test(num_pages - i, &eb->io_pages)) | |
3188 | end_extent_buffer_writeback(eb); | |
3189 | ret = -EIO; | |
3190 | break; | |
3191 | } | |
3192 | offset += PAGE_CACHE_SIZE; | |
3193 | update_nr_written(p, wbc, 1); | |
3194 | unlock_page(p); | |
3195 | } | |
3196 | ||
3197 | if (unlikely(ret)) { | |
3198 | for (; i < num_pages; i++) { | |
3199 | struct page *p = extent_buffer_page(eb, i); | |
3200 | unlock_page(p); | |
3201 | } | |
3202 | } | |
3203 | ||
3204 | return ret; | |
3205 | } | |
3206 | ||
3207 | int btree_write_cache_pages(struct address_space *mapping, | |
3208 | struct writeback_control *wbc) | |
3209 | { | |
3210 | struct extent_io_tree *tree = &BTRFS_I(mapping->host)->io_tree; | |
3211 | struct btrfs_fs_info *fs_info = BTRFS_I(mapping->host)->root->fs_info; | |
3212 | struct extent_buffer *eb, *prev_eb = NULL; | |
3213 | struct extent_page_data epd = { | |
3214 | .bio = NULL, | |
3215 | .tree = tree, | |
3216 | .extent_locked = 0, | |
3217 | .sync_io = wbc->sync_mode == WB_SYNC_ALL, | |
3218 | }; | |
3219 | int ret = 0; | |
3220 | int done = 0; | |
3221 | int nr_to_write_done = 0; | |
3222 | struct pagevec pvec; | |
3223 | int nr_pages; | |
3224 | pgoff_t index; | |
3225 | pgoff_t end; /* Inclusive */ | |
3226 | int scanned = 0; | |
3227 | int tag; | |
3228 | ||
3229 | pagevec_init(&pvec, 0); | |
3230 | if (wbc->range_cyclic) { | |
3231 | index = mapping->writeback_index; /* Start from prev offset */ | |
3232 | end = -1; | |
3233 | } else { | |
3234 | index = wbc->range_start >> PAGE_CACHE_SHIFT; | |
3235 | end = wbc->range_end >> PAGE_CACHE_SHIFT; | |
3236 | scanned = 1; | |
3237 | } | |
3238 | if (wbc->sync_mode == WB_SYNC_ALL) | |
3239 | tag = PAGECACHE_TAG_TOWRITE; | |
3240 | else | |
3241 | tag = PAGECACHE_TAG_DIRTY; | |
3242 | retry: | |
3243 | if (wbc->sync_mode == WB_SYNC_ALL) | |
3244 | tag_pages_for_writeback(mapping, index, end); | |
3245 | while (!done && !nr_to_write_done && (index <= end) && | |
3246 | (nr_pages = pagevec_lookup_tag(&pvec, mapping, &index, tag, | |
3247 | min(end - index, (pgoff_t)PAGEVEC_SIZE-1) + 1))) { | |
3248 | unsigned i; | |
3249 | ||
3250 | scanned = 1; | |
3251 | for (i = 0; i < nr_pages; i++) { | |
3252 | struct page *page = pvec.pages[i]; | |
3253 | ||
3254 | if (!PagePrivate(page)) | |
3255 | continue; | |
3256 | ||
3257 | if (!wbc->range_cyclic && page->index > end) { | |
3258 | done = 1; | |
3259 | break; | |
3260 | } | |
3261 | ||
3262 | eb = (struct extent_buffer *)page->private; | |
3263 | if (!eb) { | |
3264 | WARN_ON(1); | |
3265 | continue; | |
3266 | } | |
3267 | ||
3268 | if (eb == prev_eb) | |
3269 | continue; | |
3270 | ||
3271 | if (!atomic_inc_not_zero(&eb->refs)) { | |
3272 | WARN_ON(1); | |
3273 | continue; | |
3274 | } | |
3275 | ||
3276 | prev_eb = eb; | |
3277 | ret = lock_extent_buffer_for_io(eb, fs_info, &epd); | |
3278 | if (!ret) { | |
3279 | free_extent_buffer(eb); | |
3280 | continue; | |
3281 | } | |
3282 | ||
3283 | ret = write_one_eb(eb, fs_info, wbc, &epd); | |
3284 | if (ret) { | |
3285 | done = 1; | |
3286 | free_extent_buffer(eb); | |
3287 | break; | |
3288 | } | |
3289 | free_extent_buffer(eb); | |
3290 | ||
3291 | /* | |
3292 | * the filesystem may choose to bump up nr_to_write. | |
3293 | * We have to make sure to honor the new nr_to_write | |
3294 | * at any time | |
3295 | */ | |
3296 | nr_to_write_done = wbc->nr_to_write <= 0; | |
3297 | } | |
3298 | pagevec_release(&pvec); | |
3299 | cond_resched(); | |
3300 | } | |
3301 | if (!scanned && !done) { | |
3302 | /* | |
3303 | * We hit the last page and there is more work to be done: wrap | |
3304 | * back to the start of the file | |
3305 | */ | |
3306 | scanned = 1; | |
3307 | index = 0; | |
3308 | goto retry; | |
3309 | } | |
3310 | flush_write_bio(&epd); | |
3311 | return ret; | |
3312 | } | |
3313 | ||
d1310b2e | 3314 | /** |
4bef0848 | 3315 | * write_cache_pages - walk the list of dirty pages of the given address space and write all of them. |
d1310b2e CM |
3316 | * @mapping: address space structure to write |
3317 | * @wbc: subtract the number of written pages from *@wbc->nr_to_write | |
3318 | * @writepage: function called for each page | |
3319 | * @data: data passed to writepage function | |
3320 | * | |
3321 | * If a page is already under I/O, write_cache_pages() skips it, even | |
3322 | * if it's dirty. This is desirable behaviour for memory-cleaning writeback, | |
3323 | * but it is INCORRECT for data-integrity system calls such as fsync(). fsync() | |
3324 | * and msync() need to guarantee that all the data which was dirty at the time | |
3325 | * the call was made get new I/O started against them. If wbc->sync_mode is | |
3326 | * WB_SYNC_ALL then we were called for data integrity and we must wait for | |
3327 | * existing IO to complete. | |
3328 | */ | |
b2950863 | 3329 | static int extent_write_cache_pages(struct extent_io_tree *tree, |
4bef0848 CM |
3330 | struct address_space *mapping, |
3331 | struct writeback_control *wbc, | |
d2c3f4f6 CM |
3332 | writepage_t writepage, void *data, |
3333 | void (*flush_fn)(void *)) | |
d1310b2e | 3334 | { |
d1310b2e CM |
3335 | int ret = 0; |
3336 | int done = 0; | |
f85d7d6c | 3337 | int nr_to_write_done = 0; |
d1310b2e CM |
3338 | struct pagevec pvec; |
3339 | int nr_pages; | |
3340 | pgoff_t index; | |
3341 | pgoff_t end; /* Inclusive */ | |
3342 | int scanned = 0; | |
f7aaa06b | 3343 | int tag; |
d1310b2e | 3344 | |
d1310b2e CM |
3345 | pagevec_init(&pvec, 0); |
3346 | if (wbc->range_cyclic) { | |
3347 | index = mapping->writeback_index; /* Start from prev offset */ | |
3348 | end = -1; | |
3349 | } else { | |
3350 | index = wbc->range_start >> PAGE_CACHE_SHIFT; | |
3351 | end = wbc->range_end >> PAGE_CACHE_SHIFT; | |
d1310b2e CM |
3352 | scanned = 1; |
3353 | } | |
f7aaa06b JB |
3354 | if (wbc->sync_mode == WB_SYNC_ALL) |
3355 | tag = PAGECACHE_TAG_TOWRITE; | |
3356 | else | |
3357 | tag = PAGECACHE_TAG_DIRTY; | |
d1310b2e | 3358 | retry: |
f7aaa06b JB |
3359 | if (wbc->sync_mode == WB_SYNC_ALL) |
3360 | tag_pages_for_writeback(mapping, index, end); | |
f85d7d6c | 3361 | while (!done && !nr_to_write_done && (index <= end) && |
f7aaa06b JB |
3362 | (nr_pages = pagevec_lookup_tag(&pvec, mapping, &index, tag, |
3363 | min(end - index, (pgoff_t)PAGEVEC_SIZE-1) + 1))) { | |
d1310b2e CM |
3364 | unsigned i; |
3365 | ||
3366 | scanned = 1; | |
3367 | for (i = 0; i < nr_pages; i++) { | |
3368 | struct page *page = pvec.pages[i]; | |
3369 | ||
3370 | /* | |
3371 | * At this point we hold neither mapping->tree_lock nor | |
3372 | * lock on the page itself: the page may be truncated or | |
3373 | * invalidated (changing page->mapping to NULL), or even | |
3374 | * swizzled back from swapper_space to tmpfs file | |
3375 | * mapping | |
3376 | */ | |
01d658f2 CM |
3377 | if (tree->ops && |
3378 | tree->ops->write_cache_pages_lock_hook) { | |
3379 | tree->ops->write_cache_pages_lock_hook(page, | |
3380 | data, flush_fn); | |
3381 | } else { | |
3382 | if (!trylock_page(page)) { | |
3383 | flush_fn(data); | |
3384 | lock_page(page); | |
3385 | } | |
3386 | } | |
d1310b2e CM |
3387 | |
3388 | if (unlikely(page->mapping != mapping)) { | |
3389 | unlock_page(page); | |
3390 | continue; | |
3391 | } | |
3392 | ||
3393 | if (!wbc->range_cyclic && page->index > end) { | |
3394 | done = 1; | |
3395 | unlock_page(page); | |
3396 | continue; | |
3397 | } | |
3398 | ||
d2c3f4f6 | 3399 | if (wbc->sync_mode != WB_SYNC_NONE) { |
0e6bd956 CM |
3400 | if (PageWriteback(page)) |
3401 | flush_fn(data); | |
d1310b2e | 3402 | wait_on_page_writeback(page); |
d2c3f4f6 | 3403 | } |
d1310b2e CM |
3404 | |
3405 | if (PageWriteback(page) || | |
3406 | !clear_page_dirty_for_io(page)) { | |
3407 | unlock_page(page); | |
3408 | continue; | |
3409 | } | |
3410 | ||
3411 | ret = (*writepage)(page, wbc, data); | |
3412 | ||
3413 | if (unlikely(ret == AOP_WRITEPAGE_ACTIVATE)) { | |
3414 | unlock_page(page); | |
3415 | ret = 0; | |
3416 | } | |
f85d7d6c | 3417 | if (ret) |
d1310b2e | 3418 | done = 1; |
f85d7d6c CM |
3419 | |
3420 | /* | |
3421 | * the filesystem may choose to bump up nr_to_write. | |
3422 | * We have to make sure to honor the new nr_to_write | |
3423 | * at any time | |
3424 | */ | |
3425 | nr_to_write_done = wbc->nr_to_write <= 0; | |
d1310b2e CM |
3426 | } |
3427 | pagevec_release(&pvec); | |
3428 | cond_resched(); | |
3429 | } | |
3430 | if (!scanned && !done) { | |
3431 | /* | |
3432 | * We hit the last page and there is more work to be done: wrap | |
3433 | * back to the start of the file | |
3434 | */ | |
3435 | scanned = 1; | |
3436 | index = 0; | |
3437 | goto retry; | |
3438 | } | |
d1310b2e CM |
3439 | return ret; |
3440 | } | |
d1310b2e | 3441 | |
ffbd517d | 3442 | static void flush_epd_write_bio(struct extent_page_data *epd) |
d2c3f4f6 | 3443 | { |
d2c3f4f6 | 3444 | if (epd->bio) { |
355808c2 JM |
3445 | int rw = WRITE; |
3446 | int ret; | |
3447 | ||
ffbd517d | 3448 | if (epd->sync_io) |
355808c2 JM |
3449 | rw = WRITE_SYNC; |
3450 | ||
3451 | ret = submit_one_bio(rw, epd->bio, 0, 0); | |
79787eaa | 3452 | BUG_ON(ret < 0); /* -ENOMEM */ |
d2c3f4f6 CM |
3453 | epd->bio = NULL; |
3454 | } | |
3455 | } | |
3456 | ||
ffbd517d CM |
3457 | static noinline void flush_write_bio(void *data) |
3458 | { | |
3459 | struct extent_page_data *epd = data; | |
3460 | flush_epd_write_bio(epd); | |
3461 | } | |
3462 | ||
d1310b2e CM |
3463 | int extent_write_full_page(struct extent_io_tree *tree, struct page *page, |
3464 | get_extent_t *get_extent, | |
3465 | struct writeback_control *wbc) | |
3466 | { | |
3467 | int ret; | |
d1310b2e CM |
3468 | struct extent_page_data epd = { |
3469 | .bio = NULL, | |
3470 | .tree = tree, | |
3471 | .get_extent = get_extent, | |
771ed689 | 3472 | .extent_locked = 0, |
ffbd517d | 3473 | .sync_io = wbc->sync_mode == WB_SYNC_ALL, |
d1310b2e | 3474 | }; |
d1310b2e | 3475 | |
d1310b2e CM |
3476 | ret = __extent_writepage(page, wbc, &epd); |
3477 | ||
ffbd517d | 3478 | flush_epd_write_bio(&epd); |
d1310b2e CM |
3479 | return ret; |
3480 | } | |
d1310b2e | 3481 | |
771ed689 CM |
3482 | int extent_write_locked_range(struct extent_io_tree *tree, struct inode *inode, |
3483 | u64 start, u64 end, get_extent_t *get_extent, | |
3484 | int mode) | |
3485 | { | |
3486 | int ret = 0; | |
3487 | struct address_space *mapping = inode->i_mapping; | |
3488 | struct page *page; | |
3489 | unsigned long nr_pages = (end - start + PAGE_CACHE_SIZE) >> | |
3490 | PAGE_CACHE_SHIFT; | |
3491 | ||
3492 | struct extent_page_data epd = { | |
3493 | .bio = NULL, | |
3494 | .tree = tree, | |
3495 | .get_extent = get_extent, | |
3496 | .extent_locked = 1, | |
ffbd517d | 3497 | .sync_io = mode == WB_SYNC_ALL, |
771ed689 CM |
3498 | }; |
3499 | struct writeback_control wbc_writepages = { | |
771ed689 | 3500 | .sync_mode = mode, |
771ed689 CM |
3501 | .nr_to_write = nr_pages * 2, |
3502 | .range_start = start, | |
3503 | .range_end = end + 1, | |
3504 | }; | |
3505 | ||
d397712b | 3506 | while (start <= end) { |
771ed689 CM |
3507 | page = find_get_page(mapping, start >> PAGE_CACHE_SHIFT); |
3508 | if (clear_page_dirty_for_io(page)) | |
3509 | ret = __extent_writepage(page, &wbc_writepages, &epd); | |
3510 | else { | |
3511 | if (tree->ops && tree->ops->writepage_end_io_hook) | |
3512 | tree->ops->writepage_end_io_hook(page, start, | |
3513 | start + PAGE_CACHE_SIZE - 1, | |
3514 | NULL, 1); | |
3515 | unlock_page(page); | |
3516 | } | |
3517 | page_cache_release(page); | |
3518 | start += PAGE_CACHE_SIZE; | |
3519 | } | |
3520 | ||
ffbd517d | 3521 | flush_epd_write_bio(&epd); |
771ed689 CM |
3522 | return ret; |
3523 | } | |
d1310b2e CM |
3524 | |
3525 | int extent_writepages(struct extent_io_tree *tree, | |
3526 | struct address_space *mapping, | |
3527 | get_extent_t *get_extent, | |
3528 | struct writeback_control *wbc) | |
3529 | { | |
3530 | int ret = 0; | |
3531 | struct extent_page_data epd = { | |
3532 | .bio = NULL, | |
3533 | .tree = tree, | |
3534 | .get_extent = get_extent, | |
771ed689 | 3535 | .extent_locked = 0, |
ffbd517d | 3536 | .sync_io = wbc->sync_mode == WB_SYNC_ALL, |
d1310b2e CM |
3537 | }; |
3538 | ||
4bef0848 | 3539 | ret = extent_write_cache_pages(tree, mapping, wbc, |
d2c3f4f6 CM |
3540 | __extent_writepage, &epd, |
3541 | flush_write_bio); | |
ffbd517d | 3542 | flush_epd_write_bio(&epd); |
d1310b2e CM |
3543 | return ret; |
3544 | } | |
d1310b2e CM |
3545 | |
3546 | int extent_readpages(struct extent_io_tree *tree, | |
3547 | struct address_space *mapping, | |
3548 | struct list_head *pages, unsigned nr_pages, | |
3549 | get_extent_t get_extent) | |
3550 | { | |
3551 | struct bio *bio = NULL; | |
3552 | unsigned page_idx; | |
c8b97818 | 3553 | unsigned long bio_flags = 0; |
d1310b2e | 3554 | |
d1310b2e CM |
3555 | for (page_idx = 0; page_idx < nr_pages; page_idx++) { |
3556 | struct page *page = list_entry(pages->prev, struct page, lru); | |
3557 | ||
3558 | prefetchw(&page->flags); | |
3559 | list_del(&page->lru); | |
28ecb609 | 3560 | if (!add_to_page_cache_lru(page, mapping, |
43e817a1 | 3561 | page->index, GFP_NOFS)) { |
f188591e | 3562 | __extent_read_full_page(tree, page, get_extent, |
c8b97818 | 3563 | &bio, 0, &bio_flags); |
d1310b2e CM |
3564 | } |
3565 | page_cache_release(page); | |
3566 | } | |
d1310b2e CM |
3567 | BUG_ON(!list_empty(pages)); |
3568 | if (bio) | |
79787eaa | 3569 | return submit_one_bio(READ, bio, 0, bio_flags); |
d1310b2e CM |
3570 | return 0; |
3571 | } | |
d1310b2e CM |
3572 | |
3573 | /* | |
3574 | * basic invalidatepage code, this waits on any locked or writeback | |
3575 | * ranges corresponding to the page, and then deletes any extent state | |
3576 | * records from the tree | |
3577 | */ | |
3578 | int extent_invalidatepage(struct extent_io_tree *tree, | |
3579 | struct page *page, unsigned long offset) | |
3580 | { | |
2ac55d41 | 3581 | struct extent_state *cached_state = NULL; |
d1310b2e CM |
3582 | u64 start = ((u64)page->index << PAGE_CACHE_SHIFT); |
3583 | u64 end = start + PAGE_CACHE_SIZE - 1; | |
3584 | size_t blocksize = page->mapping->host->i_sb->s_blocksize; | |
3585 | ||
d397712b | 3586 | start += (offset + blocksize - 1) & ~(blocksize - 1); |
d1310b2e CM |
3587 | if (start > end) |
3588 | return 0; | |
3589 | ||
d0082371 | 3590 | lock_extent_bits(tree, start, end, 0, &cached_state); |
1edbb734 | 3591 | wait_on_page_writeback(page); |
d1310b2e | 3592 | clear_extent_bit(tree, start, end, |
32c00aff JB |
3593 | EXTENT_LOCKED | EXTENT_DIRTY | EXTENT_DELALLOC | |
3594 | EXTENT_DO_ACCOUNTING, | |
2ac55d41 | 3595 | 1, 1, &cached_state, GFP_NOFS); |
d1310b2e CM |
3596 | return 0; |
3597 | } | |
d1310b2e | 3598 | |
7b13b7b1 CM |
3599 | /* |
3600 | * a helper for releasepage, this tests for areas of the page that | |
3601 | * are locked or under IO and drops the related state bits if it is safe | |
3602 | * to drop the page. | |
3603 | */ | |
3604 | int try_release_extent_state(struct extent_map_tree *map, | |
3605 | struct extent_io_tree *tree, struct page *page, | |
3606 | gfp_t mask) | |
3607 | { | |
3608 | u64 start = (u64)page->index << PAGE_CACHE_SHIFT; | |
3609 | u64 end = start + PAGE_CACHE_SIZE - 1; | |
3610 | int ret = 1; | |
3611 | ||
211f90e6 | 3612 | if (test_range_bit(tree, start, end, |
8b62b72b | 3613 | EXTENT_IOBITS, 0, NULL)) |
7b13b7b1 CM |
3614 | ret = 0; |
3615 | else { | |
3616 | if ((mask & GFP_NOFS) == GFP_NOFS) | |
3617 | mask = GFP_NOFS; | |
11ef160f CM |
3618 | /* |
3619 | * at this point we can safely clear everything except the | |
3620 | * locked bit and the nodatasum bit | |
3621 | */ | |
e3f24cc5 | 3622 | ret = clear_extent_bit(tree, start, end, |
11ef160f CM |
3623 | ~(EXTENT_LOCKED | EXTENT_NODATASUM), |
3624 | 0, 0, NULL, mask); | |
e3f24cc5 CM |
3625 | |
3626 | /* if clear_extent_bit failed for enomem reasons, | |
3627 | * we can't allow the release to continue. | |
3628 | */ | |
3629 | if (ret < 0) | |
3630 | ret = 0; | |
3631 | else | |
3632 | ret = 1; | |
7b13b7b1 CM |
3633 | } |
3634 | return ret; | |
3635 | } | |
7b13b7b1 | 3636 | |
d1310b2e CM |
3637 | /* |
3638 | * a helper for releasepage. As long as there are no locked extents | |
3639 | * in the range corresponding to the page, both state records and extent | |
3640 | * map records are removed | |
3641 | */ | |
3642 | int try_release_extent_mapping(struct extent_map_tree *map, | |
70dec807 CM |
3643 | struct extent_io_tree *tree, struct page *page, |
3644 | gfp_t mask) | |
d1310b2e CM |
3645 | { |
3646 | struct extent_map *em; | |
3647 | u64 start = (u64)page->index << PAGE_CACHE_SHIFT; | |
3648 | u64 end = start + PAGE_CACHE_SIZE - 1; | |
7b13b7b1 | 3649 | |
70dec807 CM |
3650 | if ((mask & __GFP_WAIT) && |
3651 | page->mapping->host->i_size > 16 * 1024 * 1024) { | |
39b5637f | 3652 | u64 len; |
70dec807 | 3653 | while (start <= end) { |
39b5637f | 3654 | len = end - start + 1; |
890871be | 3655 | write_lock(&map->lock); |
39b5637f | 3656 | em = lookup_extent_mapping(map, start, len); |
285190d9 | 3657 | if (!em) { |
890871be | 3658 | write_unlock(&map->lock); |
70dec807 CM |
3659 | break; |
3660 | } | |
7f3c74fb CM |
3661 | if (test_bit(EXTENT_FLAG_PINNED, &em->flags) || |
3662 | em->start != start) { | |
890871be | 3663 | write_unlock(&map->lock); |
70dec807 CM |
3664 | free_extent_map(em); |
3665 | break; | |
3666 | } | |
3667 | if (!test_range_bit(tree, em->start, | |
3668 | extent_map_end(em) - 1, | |
8b62b72b | 3669 | EXTENT_LOCKED | EXTENT_WRITEBACK, |
9655d298 | 3670 | 0, NULL)) { |
70dec807 CM |
3671 | remove_extent_mapping(map, em); |
3672 | /* once for the rb tree */ | |
3673 | free_extent_map(em); | |
3674 | } | |
3675 | start = extent_map_end(em); | |
890871be | 3676 | write_unlock(&map->lock); |
70dec807 CM |
3677 | |
3678 | /* once for us */ | |
d1310b2e CM |
3679 | free_extent_map(em); |
3680 | } | |
d1310b2e | 3681 | } |
7b13b7b1 | 3682 | return try_release_extent_state(map, tree, page, mask); |
d1310b2e | 3683 | } |
d1310b2e | 3684 | |
ec29ed5b CM |
3685 | /* |
3686 | * helper function for fiemap, which doesn't want to see any holes. | |
3687 | * This maps until we find something past 'last' | |
3688 | */ | |
3689 | static struct extent_map *get_extent_skip_holes(struct inode *inode, | |
3690 | u64 offset, | |
3691 | u64 last, | |
3692 | get_extent_t *get_extent) | |
3693 | { | |
3694 | u64 sectorsize = BTRFS_I(inode)->root->sectorsize; | |
3695 | struct extent_map *em; | |
3696 | u64 len; | |
3697 | ||
3698 | if (offset >= last) | |
3699 | return NULL; | |
3700 | ||
3701 | while(1) { | |
3702 | len = last - offset; | |
3703 | if (len == 0) | |
3704 | break; | |
3705 | len = (len + sectorsize - 1) & ~(sectorsize - 1); | |
3706 | em = get_extent(inode, NULL, 0, offset, len, 0); | |
c704005d | 3707 | if (IS_ERR_OR_NULL(em)) |
ec29ed5b CM |
3708 | return em; |
3709 | ||
3710 | /* if this isn't a hole return it */ | |
3711 | if (!test_bit(EXTENT_FLAG_VACANCY, &em->flags) && | |
3712 | em->block_start != EXTENT_MAP_HOLE) { | |
3713 | return em; | |
3714 | } | |
3715 | ||
3716 | /* this is a hole, advance to the next extent */ | |
3717 | offset = extent_map_end(em); | |
3718 | free_extent_map(em); | |
3719 | if (offset >= last) | |
3720 | break; | |
3721 | } | |
3722 | return NULL; | |
3723 | } | |
3724 | ||
1506fcc8 YS |
3725 | int extent_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, |
3726 | __u64 start, __u64 len, get_extent_t *get_extent) | |
3727 | { | |
975f84fe | 3728 | int ret = 0; |
1506fcc8 YS |
3729 | u64 off = start; |
3730 | u64 max = start + len; | |
3731 | u32 flags = 0; | |
975f84fe JB |
3732 | u32 found_type; |
3733 | u64 last; | |
ec29ed5b | 3734 | u64 last_for_get_extent = 0; |
1506fcc8 | 3735 | u64 disko = 0; |
ec29ed5b | 3736 | u64 isize = i_size_read(inode); |
975f84fe | 3737 | struct btrfs_key found_key; |
1506fcc8 | 3738 | struct extent_map *em = NULL; |
2ac55d41 | 3739 | struct extent_state *cached_state = NULL; |
975f84fe JB |
3740 | struct btrfs_path *path; |
3741 | struct btrfs_file_extent_item *item; | |
1506fcc8 | 3742 | int end = 0; |
ec29ed5b CM |
3743 | u64 em_start = 0; |
3744 | u64 em_len = 0; | |
3745 | u64 em_end = 0; | |
1506fcc8 | 3746 | unsigned long emflags; |
1506fcc8 YS |
3747 | |
3748 | if (len == 0) | |
3749 | return -EINVAL; | |
3750 | ||
975f84fe JB |
3751 | path = btrfs_alloc_path(); |
3752 | if (!path) | |
3753 | return -ENOMEM; | |
3754 | path->leave_spinning = 1; | |
3755 | ||
4d479cf0 JB |
3756 | start = ALIGN(start, BTRFS_I(inode)->root->sectorsize); |
3757 | len = ALIGN(len, BTRFS_I(inode)->root->sectorsize); | |
3758 | ||
ec29ed5b CM |
3759 | /* |
3760 | * lookup the last file extent. We're not using i_size here | |
3761 | * because there might be preallocation past i_size | |
3762 | */ | |
975f84fe | 3763 | ret = btrfs_lookup_file_extent(NULL, BTRFS_I(inode)->root, |
33345d01 | 3764 | path, btrfs_ino(inode), -1, 0); |
975f84fe JB |
3765 | if (ret < 0) { |
3766 | btrfs_free_path(path); | |
3767 | return ret; | |
3768 | } | |
3769 | WARN_ON(!ret); | |
3770 | path->slots[0]--; | |
3771 | item = btrfs_item_ptr(path->nodes[0], path->slots[0], | |
3772 | struct btrfs_file_extent_item); | |
3773 | btrfs_item_key_to_cpu(path->nodes[0], &found_key, path->slots[0]); | |
3774 | found_type = btrfs_key_type(&found_key); | |
3775 | ||
ec29ed5b | 3776 | /* No extents, but there might be delalloc bits */ |
33345d01 | 3777 | if (found_key.objectid != btrfs_ino(inode) || |
975f84fe | 3778 | found_type != BTRFS_EXTENT_DATA_KEY) { |
ec29ed5b CM |
3779 | /* have to trust i_size as the end */ |
3780 | last = (u64)-1; | |
3781 | last_for_get_extent = isize; | |
3782 | } else { | |
3783 | /* | |
3784 | * remember the start of the last extent. There are a | |
3785 | * bunch of different factors that go into the length of the | |
3786 | * extent, so its much less complex to remember where it started | |
3787 | */ | |
3788 | last = found_key.offset; | |
3789 | last_for_get_extent = last + 1; | |
975f84fe | 3790 | } |
975f84fe JB |
3791 | btrfs_free_path(path); |
3792 | ||
ec29ed5b CM |
3793 | /* |
3794 | * we might have some extents allocated but more delalloc past those | |
3795 | * extents. so, we trust isize unless the start of the last extent is | |
3796 | * beyond isize | |
3797 | */ | |
3798 | if (last < isize) { | |
3799 | last = (u64)-1; | |
3800 | last_for_get_extent = isize; | |
3801 | } | |
3802 | ||
2ac55d41 | 3803 | lock_extent_bits(&BTRFS_I(inode)->io_tree, start, start + len, 0, |
d0082371 | 3804 | &cached_state); |
ec29ed5b | 3805 | |
4d479cf0 | 3806 | em = get_extent_skip_holes(inode, start, last_for_get_extent, |
ec29ed5b | 3807 | get_extent); |
1506fcc8 YS |
3808 | if (!em) |
3809 | goto out; | |
3810 | if (IS_ERR(em)) { | |
3811 | ret = PTR_ERR(em); | |
3812 | goto out; | |
3813 | } | |
975f84fe | 3814 | |
1506fcc8 | 3815 | while (!end) { |
ea8efc74 CM |
3816 | u64 offset_in_extent; |
3817 | ||
3818 | /* break if the extent we found is outside the range */ | |
3819 | if (em->start >= max || extent_map_end(em) < off) | |
3820 | break; | |
3821 | ||
3822 | /* | |
3823 | * get_extent may return an extent that starts before our | |
3824 | * requested range. We have to make sure the ranges | |
3825 | * we return to fiemap always move forward and don't | |
3826 | * overlap, so adjust the offsets here | |
3827 | */ | |
3828 | em_start = max(em->start, off); | |
1506fcc8 | 3829 | |
ea8efc74 CM |
3830 | /* |
3831 | * record the offset from the start of the extent | |
3832 | * for adjusting the disk offset below | |
3833 | */ | |
3834 | offset_in_extent = em_start - em->start; | |
ec29ed5b | 3835 | em_end = extent_map_end(em); |
ea8efc74 | 3836 | em_len = em_end - em_start; |
ec29ed5b | 3837 | emflags = em->flags; |
1506fcc8 YS |
3838 | disko = 0; |
3839 | flags = 0; | |
3840 | ||
ea8efc74 CM |
3841 | /* |
3842 | * bump off for our next call to get_extent | |
3843 | */ | |
3844 | off = extent_map_end(em); | |
3845 | if (off >= max) | |
3846 | end = 1; | |
3847 | ||
93dbfad7 | 3848 | if (em->block_start == EXTENT_MAP_LAST_BYTE) { |
1506fcc8 YS |
3849 | end = 1; |
3850 | flags |= FIEMAP_EXTENT_LAST; | |
93dbfad7 | 3851 | } else if (em->block_start == EXTENT_MAP_INLINE) { |
1506fcc8 YS |
3852 | flags |= (FIEMAP_EXTENT_DATA_INLINE | |
3853 | FIEMAP_EXTENT_NOT_ALIGNED); | |
93dbfad7 | 3854 | } else if (em->block_start == EXTENT_MAP_DELALLOC) { |
1506fcc8 YS |
3855 | flags |= (FIEMAP_EXTENT_DELALLOC | |
3856 | FIEMAP_EXTENT_UNKNOWN); | |
93dbfad7 | 3857 | } else { |
ea8efc74 | 3858 | disko = em->block_start + offset_in_extent; |
1506fcc8 YS |
3859 | } |
3860 | if (test_bit(EXTENT_FLAG_COMPRESSED, &em->flags)) | |
3861 | flags |= FIEMAP_EXTENT_ENCODED; | |
3862 | ||
1506fcc8 YS |
3863 | free_extent_map(em); |
3864 | em = NULL; | |
ec29ed5b CM |
3865 | if ((em_start >= last) || em_len == (u64)-1 || |
3866 | (last == (u64)-1 && isize <= em_end)) { | |
1506fcc8 YS |
3867 | flags |= FIEMAP_EXTENT_LAST; |
3868 | end = 1; | |
3869 | } | |
3870 | ||
ec29ed5b CM |
3871 | /* now scan forward to see if this is really the last extent. */ |
3872 | em = get_extent_skip_holes(inode, off, last_for_get_extent, | |
3873 | get_extent); | |
3874 | if (IS_ERR(em)) { | |
3875 | ret = PTR_ERR(em); | |
3876 | goto out; | |
3877 | } | |
3878 | if (!em) { | |
975f84fe JB |
3879 | flags |= FIEMAP_EXTENT_LAST; |
3880 | end = 1; | |
3881 | } | |
ec29ed5b CM |
3882 | ret = fiemap_fill_next_extent(fieinfo, em_start, disko, |
3883 | em_len, flags); | |
3884 | if (ret) | |
3885 | goto out_free; | |
1506fcc8 YS |
3886 | } |
3887 | out_free: | |
3888 | free_extent_map(em); | |
3889 | out: | |
2ac55d41 JB |
3890 | unlock_extent_cached(&BTRFS_I(inode)->io_tree, start, start + len, |
3891 | &cached_state, GFP_NOFS); | |
1506fcc8 YS |
3892 | return ret; |
3893 | } | |
3894 | ||
4a54c8c1 | 3895 | inline struct page *extent_buffer_page(struct extent_buffer *eb, |
d1310b2e CM |
3896 | unsigned long i) |
3897 | { | |
727011e0 | 3898 | return eb->pages[i]; |
d1310b2e CM |
3899 | } |
3900 | ||
4a54c8c1 | 3901 | inline unsigned long num_extent_pages(u64 start, u64 len) |
728131d8 | 3902 | { |
6af118ce CM |
3903 | return ((start + len + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT) - |
3904 | (start >> PAGE_CACHE_SHIFT); | |
728131d8 CM |
3905 | } |
3906 | ||
727011e0 CM |
3907 | static void __free_extent_buffer(struct extent_buffer *eb) |
3908 | { | |
3909 | #if LEAK_DEBUG | |
3910 | unsigned long flags; | |
3911 | spin_lock_irqsave(&leak_lock, flags); | |
3912 | list_del(&eb->leak_list); | |
3913 | spin_unlock_irqrestore(&leak_lock, flags); | |
3914 | #endif | |
3915 | if (eb->pages && eb->pages != eb->inline_pages) | |
3916 | kfree(eb->pages); | |
3917 | kmem_cache_free(extent_buffer_cache, eb); | |
3918 | } | |
3919 | ||
d1310b2e CM |
3920 | static struct extent_buffer *__alloc_extent_buffer(struct extent_io_tree *tree, |
3921 | u64 start, | |
3922 | unsigned long len, | |
3923 | gfp_t mask) | |
3924 | { | |
3925 | struct extent_buffer *eb = NULL; | |
3935127c | 3926 | #if LEAK_DEBUG |
2d2ae547 | 3927 | unsigned long flags; |
4bef0848 | 3928 | #endif |
d1310b2e | 3929 | |
d1310b2e | 3930 | eb = kmem_cache_zalloc(extent_buffer_cache, mask); |
91ca338d TI |
3931 | if (eb == NULL) |
3932 | return NULL; | |
d1310b2e CM |
3933 | eb->start = start; |
3934 | eb->len = len; | |
4f2de97a | 3935 | eb->tree = tree; |
bd681513 CM |
3936 | rwlock_init(&eb->lock); |
3937 | atomic_set(&eb->write_locks, 0); | |
3938 | atomic_set(&eb->read_locks, 0); | |
3939 | atomic_set(&eb->blocking_readers, 0); | |
3940 | atomic_set(&eb->blocking_writers, 0); | |
3941 | atomic_set(&eb->spinning_readers, 0); | |
3942 | atomic_set(&eb->spinning_writers, 0); | |
5b25f70f | 3943 | eb->lock_nested = 0; |
bd681513 CM |
3944 | init_waitqueue_head(&eb->write_lock_wq); |
3945 | init_waitqueue_head(&eb->read_lock_wq); | |
b4ce94de | 3946 | |
3935127c | 3947 | #if LEAK_DEBUG |
2d2ae547 CM |
3948 | spin_lock_irqsave(&leak_lock, flags); |
3949 | list_add(&eb->leak_list, &buffers); | |
3950 | spin_unlock_irqrestore(&leak_lock, flags); | |
4bef0848 | 3951 | #endif |
3083ee2e | 3952 | spin_lock_init(&eb->refs_lock); |
d1310b2e | 3953 | atomic_set(&eb->refs, 1); |
0b32f4bb | 3954 | atomic_set(&eb->io_pages, 0); |
727011e0 CM |
3955 | |
3956 | if (len > MAX_INLINE_EXTENT_BUFFER_SIZE) { | |
3957 | struct page **pages; | |
3958 | int num_pages = (len + PAGE_CACHE_SIZE - 1) >> | |
3959 | PAGE_CACHE_SHIFT; | |
3960 | pages = kzalloc(num_pages, mask); | |
3961 | if (!pages) { | |
3962 | __free_extent_buffer(eb); | |
3963 | return NULL; | |
3964 | } | |
3965 | eb->pages = pages; | |
3966 | } else { | |
3967 | eb->pages = eb->inline_pages; | |
3968 | } | |
d1310b2e CM |
3969 | |
3970 | return eb; | |
3971 | } | |
3972 | ||
0b32f4bb JB |
3973 | static int extent_buffer_under_io(struct extent_buffer *eb) |
3974 | { | |
3975 | return (atomic_read(&eb->io_pages) || | |
3976 | test_bit(EXTENT_BUFFER_WRITEBACK, &eb->bflags) || | |
3977 | test_bit(EXTENT_BUFFER_DIRTY, &eb->bflags)); | |
3978 | } | |
3979 | ||
897ca6e9 MX |
3980 | /* |
3981 | * Helper for releasing extent buffer page. | |
3982 | */ | |
3983 | static void btrfs_release_extent_buffer_page(struct extent_buffer *eb, | |
3984 | unsigned long start_idx) | |
3985 | { | |
3986 | unsigned long index; | |
3987 | struct page *page; | |
3988 | ||
0b32f4bb JB |
3989 | BUG_ON(extent_buffer_under_io(eb)); |
3990 | ||
897ca6e9 MX |
3991 | index = num_extent_pages(eb->start, eb->len); |
3992 | if (start_idx >= index) | |
3993 | return; | |
3994 | ||
3995 | do { | |
3996 | index--; | |
3997 | page = extent_buffer_page(eb, index); | |
4f2de97a JB |
3998 | if (page) { |
3999 | spin_lock(&page->mapping->private_lock); | |
4000 | /* | |
4001 | * We do this since we'll remove the pages after we've | |
4002 | * removed the eb from the radix tree, so we could race | |
4003 | * and have this page now attached to the new eb. So | |
4004 | * only clear page_private if it's still connected to | |
4005 | * this eb. | |
4006 | */ | |
4007 | if (PagePrivate(page) && | |
4008 | page->private == (unsigned long)eb) { | |
0b32f4bb | 4009 | BUG_ON(test_bit(EXTENT_BUFFER_DIRTY, &eb->bflags)); |
3083ee2e JB |
4010 | BUG_ON(PageDirty(page)); |
4011 | BUG_ON(PageWriteback(page)); | |
4f2de97a JB |
4012 | /* |
4013 | * We need to make sure we haven't be attached | |
4014 | * to a new eb. | |
4015 | */ | |
4016 | ClearPagePrivate(page); | |
4017 | set_page_private(page, 0); | |
4018 | /* One for the page private */ | |
4019 | page_cache_release(page); | |
4020 | } | |
4021 | spin_unlock(&page->mapping->private_lock); | |
4022 | ||
4023 | /* One for when we alloced the page */ | |
897ca6e9 | 4024 | page_cache_release(page); |
4f2de97a | 4025 | } |
897ca6e9 MX |
4026 | } while (index != start_idx); |
4027 | } | |
4028 | ||
4029 | /* | |
4030 | * Helper for releasing the extent buffer. | |
4031 | */ | |
4032 | static inline void btrfs_release_extent_buffer(struct extent_buffer *eb) | |
4033 | { | |
4034 | btrfs_release_extent_buffer_page(eb, 0); | |
4035 | __free_extent_buffer(eb); | |
4036 | } | |
4037 | ||
0b32f4bb JB |
4038 | static void check_buffer_tree_ref(struct extent_buffer *eb) |
4039 | { | |
4040 | /* the ref bit is tricky. We have to make sure it is set | |
4041 | * if we have the buffer dirty. Otherwise the | |
4042 | * code to free a buffer can end up dropping a dirty | |
4043 | * page | |
4044 | * | |
4045 | * Once the ref bit is set, it won't go away while the | |
4046 | * buffer is dirty or in writeback, and it also won't | |
4047 | * go away while we have the reference count on the | |
4048 | * eb bumped. | |
4049 | * | |
4050 | * We can't just set the ref bit without bumping the | |
4051 | * ref on the eb because free_extent_buffer might | |
4052 | * see the ref bit and try to clear it. If this happens | |
4053 | * free_extent_buffer might end up dropping our original | |
4054 | * ref by mistake and freeing the page before we are able | |
4055 | * to add one more ref. | |
4056 | * | |
4057 | * So bump the ref count first, then set the bit. If someone | |
4058 | * beat us to it, drop the ref we added. | |
4059 | */ | |
4060 | if (!test_bit(EXTENT_BUFFER_TREE_REF, &eb->bflags)) { | |
4061 | atomic_inc(&eb->refs); | |
4062 | if (test_and_set_bit(EXTENT_BUFFER_TREE_REF, &eb->bflags)) | |
4063 | atomic_dec(&eb->refs); | |
4064 | } | |
4065 | } | |
4066 | ||
5df4235e JB |
4067 | static void mark_extent_buffer_accessed(struct extent_buffer *eb) |
4068 | { | |
4069 | unsigned long num_pages, i; | |
4070 | ||
0b32f4bb JB |
4071 | check_buffer_tree_ref(eb); |
4072 | ||
5df4235e JB |
4073 | num_pages = num_extent_pages(eb->start, eb->len); |
4074 | for (i = 0; i < num_pages; i++) { | |
4075 | struct page *p = extent_buffer_page(eb, i); | |
4076 | mark_page_accessed(p); | |
4077 | } | |
4078 | } | |
4079 | ||
d1310b2e | 4080 | struct extent_buffer *alloc_extent_buffer(struct extent_io_tree *tree, |
727011e0 | 4081 | u64 start, unsigned long len) |
d1310b2e CM |
4082 | { |
4083 | unsigned long num_pages = num_extent_pages(start, len); | |
4084 | unsigned long i; | |
4085 | unsigned long index = start >> PAGE_CACHE_SHIFT; | |
4086 | struct extent_buffer *eb; | |
6af118ce | 4087 | struct extent_buffer *exists = NULL; |
d1310b2e CM |
4088 | struct page *p; |
4089 | struct address_space *mapping = tree->mapping; | |
4090 | int uptodate = 1; | |
19fe0a8b | 4091 | int ret; |
d1310b2e | 4092 | |
19fe0a8b MX |
4093 | rcu_read_lock(); |
4094 | eb = radix_tree_lookup(&tree->buffer, start >> PAGE_CACHE_SHIFT); | |
4095 | if (eb && atomic_inc_not_zero(&eb->refs)) { | |
4096 | rcu_read_unlock(); | |
5df4235e | 4097 | mark_extent_buffer_accessed(eb); |
6af118ce CM |
4098 | return eb; |
4099 | } | |
19fe0a8b | 4100 | rcu_read_unlock(); |
6af118ce | 4101 | |
ba144192 | 4102 | eb = __alloc_extent_buffer(tree, start, len, GFP_NOFS); |
2b114d1d | 4103 | if (!eb) |
d1310b2e CM |
4104 | return NULL; |
4105 | ||
727011e0 | 4106 | for (i = 0; i < num_pages; i++, index++) { |
a6591715 | 4107 | p = find_or_create_page(mapping, index, GFP_NOFS); |
d1310b2e CM |
4108 | if (!p) { |
4109 | WARN_ON(1); | |
6af118ce | 4110 | goto free_eb; |
d1310b2e | 4111 | } |
4f2de97a JB |
4112 | |
4113 | spin_lock(&mapping->private_lock); | |
4114 | if (PagePrivate(p)) { | |
4115 | /* | |
4116 | * We could have already allocated an eb for this page | |
4117 | * and attached one so lets see if we can get a ref on | |
4118 | * the existing eb, and if we can we know it's good and | |
4119 | * we can just return that one, else we know we can just | |
4120 | * overwrite page->private. | |
4121 | */ | |
4122 | exists = (struct extent_buffer *)p->private; | |
4123 | if (atomic_inc_not_zero(&exists->refs)) { | |
4124 | spin_unlock(&mapping->private_lock); | |
4125 | unlock_page(p); | |
5df4235e | 4126 | mark_extent_buffer_accessed(exists); |
4f2de97a JB |
4127 | goto free_eb; |
4128 | } | |
4129 | ||
0b32f4bb | 4130 | /* |
4f2de97a JB |
4131 | * Do this so attach doesn't complain and we need to |
4132 | * drop the ref the old guy had. | |
4133 | */ | |
4134 | ClearPagePrivate(p); | |
0b32f4bb | 4135 | WARN_ON(PageDirty(p)); |
4f2de97a JB |
4136 | page_cache_release(p); |
4137 | } | |
4138 | attach_extent_buffer_page(eb, p); | |
4139 | spin_unlock(&mapping->private_lock); | |
0b32f4bb | 4140 | WARN_ON(PageDirty(p)); |
d1310b2e | 4141 | mark_page_accessed(p); |
727011e0 | 4142 | eb->pages[i] = p; |
d1310b2e CM |
4143 | if (!PageUptodate(p)) |
4144 | uptodate = 0; | |
eb14ab8e CM |
4145 | |
4146 | /* | |
4147 | * see below about how we avoid a nasty race with release page | |
4148 | * and why we unlock later | |
4149 | */ | |
d1310b2e CM |
4150 | } |
4151 | if (uptodate) | |
b4ce94de | 4152 | set_bit(EXTENT_BUFFER_UPTODATE, &eb->bflags); |
115391d2 | 4153 | again: |
19fe0a8b MX |
4154 | ret = radix_tree_preload(GFP_NOFS & ~__GFP_HIGHMEM); |
4155 | if (ret) | |
4156 | goto free_eb; | |
4157 | ||
6af118ce | 4158 | spin_lock(&tree->buffer_lock); |
19fe0a8b MX |
4159 | ret = radix_tree_insert(&tree->buffer, start >> PAGE_CACHE_SHIFT, eb); |
4160 | if (ret == -EEXIST) { | |
4161 | exists = radix_tree_lookup(&tree->buffer, | |
4162 | start >> PAGE_CACHE_SHIFT); | |
115391d2 JB |
4163 | if (!atomic_inc_not_zero(&exists->refs)) { |
4164 | spin_unlock(&tree->buffer_lock); | |
4165 | radix_tree_preload_end(); | |
115391d2 JB |
4166 | exists = NULL; |
4167 | goto again; | |
4168 | } | |
6af118ce | 4169 | spin_unlock(&tree->buffer_lock); |
19fe0a8b | 4170 | radix_tree_preload_end(); |
5df4235e | 4171 | mark_extent_buffer_accessed(exists); |
6af118ce CM |
4172 | goto free_eb; |
4173 | } | |
6af118ce | 4174 | /* add one reference for the tree */ |
3083ee2e | 4175 | spin_lock(&eb->refs_lock); |
0b32f4bb | 4176 | check_buffer_tree_ref(eb); |
3083ee2e | 4177 | spin_unlock(&eb->refs_lock); |
f044ba78 | 4178 | spin_unlock(&tree->buffer_lock); |
19fe0a8b | 4179 | radix_tree_preload_end(); |
eb14ab8e CM |
4180 | |
4181 | /* | |
4182 | * there is a race where release page may have | |
4183 | * tried to find this extent buffer in the radix | |
4184 | * but failed. It will tell the VM it is safe to | |
4185 | * reclaim the, and it will clear the page private bit. | |
4186 | * We must make sure to set the page private bit properly | |
4187 | * after the extent buffer is in the radix tree so | |
4188 | * it doesn't get lost | |
4189 | */ | |
727011e0 CM |
4190 | SetPageChecked(eb->pages[0]); |
4191 | for (i = 1; i < num_pages; i++) { | |
4192 | p = extent_buffer_page(eb, i); | |
727011e0 CM |
4193 | ClearPageChecked(p); |
4194 | unlock_page(p); | |
4195 | } | |
4196 | unlock_page(eb->pages[0]); | |
d1310b2e CM |
4197 | return eb; |
4198 | ||
6af118ce | 4199 | free_eb: |
727011e0 CM |
4200 | for (i = 0; i < num_pages; i++) { |
4201 | if (eb->pages[i]) | |
4202 | unlock_page(eb->pages[i]); | |
4203 | } | |
eb14ab8e | 4204 | |
d1310b2e | 4205 | if (!atomic_dec_and_test(&eb->refs)) |
6af118ce | 4206 | return exists; |
897ca6e9 | 4207 | btrfs_release_extent_buffer(eb); |
6af118ce | 4208 | return exists; |
d1310b2e | 4209 | } |
d1310b2e CM |
4210 | |
4211 | struct extent_buffer *find_extent_buffer(struct extent_io_tree *tree, | |
f09d1f60 | 4212 | u64 start, unsigned long len) |
d1310b2e | 4213 | { |
d1310b2e | 4214 | struct extent_buffer *eb; |
d1310b2e | 4215 | |
19fe0a8b MX |
4216 | rcu_read_lock(); |
4217 | eb = radix_tree_lookup(&tree->buffer, start >> PAGE_CACHE_SHIFT); | |
4218 | if (eb && atomic_inc_not_zero(&eb->refs)) { | |
4219 | rcu_read_unlock(); | |
5df4235e | 4220 | mark_extent_buffer_accessed(eb); |
19fe0a8b MX |
4221 | return eb; |
4222 | } | |
4223 | rcu_read_unlock(); | |
0f9dd46c | 4224 | |
19fe0a8b | 4225 | return NULL; |
d1310b2e | 4226 | } |
d1310b2e | 4227 | |
3083ee2e JB |
4228 | static inline void btrfs_release_extent_buffer_rcu(struct rcu_head *head) |
4229 | { | |
4230 | struct extent_buffer *eb = | |
4231 | container_of(head, struct extent_buffer, rcu_head); | |
4232 | ||
4233 | __free_extent_buffer(eb); | |
4234 | } | |
4235 | ||
3083ee2e JB |
4236 | /* Expects to have eb->eb_lock already held */ |
4237 | static void release_extent_buffer(struct extent_buffer *eb, gfp_t mask) | |
4238 | { | |
4239 | WARN_ON(atomic_read(&eb->refs) == 0); | |
4240 | if (atomic_dec_and_test(&eb->refs)) { | |
4241 | struct extent_io_tree *tree = eb->tree; | |
3083ee2e JB |
4242 | |
4243 | spin_unlock(&eb->refs_lock); | |
4244 | ||
3083ee2e JB |
4245 | spin_lock(&tree->buffer_lock); |
4246 | radix_tree_delete(&tree->buffer, | |
4247 | eb->start >> PAGE_CACHE_SHIFT); | |
4248 | spin_unlock(&tree->buffer_lock); | |
4249 | ||
4250 | /* Should be safe to release our pages at this point */ | |
4251 | btrfs_release_extent_buffer_page(eb, 0); | |
4252 | ||
4253 | call_rcu(&eb->rcu_head, btrfs_release_extent_buffer_rcu); | |
4254 | return; | |
4255 | } | |
4256 | spin_unlock(&eb->refs_lock); | |
4257 | } | |
4258 | ||
d1310b2e CM |
4259 | void free_extent_buffer(struct extent_buffer *eb) |
4260 | { | |
d1310b2e CM |
4261 | if (!eb) |
4262 | return; | |
4263 | ||
3083ee2e JB |
4264 | spin_lock(&eb->refs_lock); |
4265 | if (atomic_read(&eb->refs) == 2 && | |
4266 | test_bit(EXTENT_BUFFER_STALE, &eb->bflags) && | |
0b32f4bb | 4267 | !extent_buffer_under_io(eb) && |
3083ee2e JB |
4268 | test_and_clear_bit(EXTENT_BUFFER_TREE_REF, &eb->bflags)) |
4269 | atomic_dec(&eb->refs); | |
4270 | ||
4271 | /* | |
4272 | * I know this is terrible, but it's temporary until we stop tracking | |
4273 | * the uptodate bits and such for the extent buffers. | |
4274 | */ | |
4275 | release_extent_buffer(eb, GFP_ATOMIC); | |
4276 | } | |
4277 | ||
4278 | void free_extent_buffer_stale(struct extent_buffer *eb) | |
4279 | { | |
4280 | if (!eb) | |
d1310b2e CM |
4281 | return; |
4282 | ||
3083ee2e JB |
4283 | spin_lock(&eb->refs_lock); |
4284 | set_bit(EXTENT_BUFFER_STALE, &eb->bflags); | |
4285 | ||
0b32f4bb | 4286 | if (atomic_read(&eb->refs) == 2 && !extent_buffer_under_io(eb) && |
3083ee2e JB |
4287 | test_and_clear_bit(EXTENT_BUFFER_TREE_REF, &eb->bflags)) |
4288 | atomic_dec(&eb->refs); | |
4289 | release_extent_buffer(eb, GFP_NOFS); | |
d1310b2e | 4290 | } |
d1310b2e | 4291 | |
1d4284bd | 4292 | void clear_extent_buffer_dirty(struct extent_buffer *eb) |
d1310b2e | 4293 | { |
d1310b2e CM |
4294 | unsigned long i; |
4295 | unsigned long num_pages; | |
4296 | struct page *page; | |
4297 | ||
d1310b2e CM |
4298 | num_pages = num_extent_pages(eb->start, eb->len); |
4299 | ||
4300 | for (i = 0; i < num_pages; i++) { | |
4301 | page = extent_buffer_page(eb, i); | |
b9473439 | 4302 | if (!PageDirty(page)) |
d2c3f4f6 CM |
4303 | continue; |
4304 | ||
a61e6f29 | 4305 | lock_page(page); |
eb14ab8e CM |
4306 | WARN_ON(!PagePrivate(page)); |
4307 | ||
d1310b2e | 4308 | clear_page_dirty_for_io(page); |
0ee0fda0 | 4309 | spin_lock_irq(&page->mapping->tree_lock); |
d1310b2e CM |
4310 | if (!PageDirty(page)) { |
4311 | radix_tree_tag_clear(&page->mapping->page_tree, | |
4312 | page_index(page), | |
4313 | PAGECACHE_TAG_DIRTY); | |
4314 | } | |
0ee0fda0 | 4315 | spin_unlock_irq(&page->mapping->tree_lock); |
bf0da8c1 | 4316 | ClearPageError(page); |
a61e6f29 | 4317 | unlock_page(page); |
d1310b2e | 4318 | } |
0b32f4bb | 4319 | WARN_ON(atomic_read(&eb->refs) == 0); |
d1310b2e | 4320 | } |
d1310b2e | 4321 | |
0b32f4bb | 4322 | int set_extent_buffer_dirty(struct extent_buffer *eb) |
d1310b2e CM |
4323 | { |
4324 | unsigned long i; | |
4325 | unsigned long num_pages; | |
b9473439 | 4326 | int was_dirty = 0; |
d1310b2e | 4327 | |
0b32f4bb JB |
4328 | check_buffer_tree_ref(eb); |
4329 | ||
b9473439 | 4330 | was_dirty = test_and_set_bit(EXTENT_BUFFER_DIRTY, &eb->bflags); |
0b32f4bb | 4331 | |
d1310b2e | 4332 | num_pages = num_extent_pages(eb->start, eb->len); |
3083ee2e | 4333 | WARN_ON(atomic_read(&eb->refs) == 0); |
0b32f4bb JB |
4334 | WARN_ON(!test_bit(EXTENT_BUFFER_TREE_REF, &eb->bflags)); |
4335 | ||
b9473439 | 4336 | for (i = 0; i < num_pages; i++) |
0b32f4bb | 4337 | set_page_dirty(extent_buffer_page(eb, i)); |
b9473439 | 4338 | return was_dirty; |
d1310b2e | 4339 | } |
d1310b2e | 4340 | |
0b32f4bb | 4341 | static int range_straddles_pages(u64 start, u64 len) |
19b6caf4 CM |
4342 | { |
4343 | if (len < PAGE_CACHE_SIZE) | |
4344 | return 1; | |
4345 | if (start & (PAGE_CACHE_SIZE - 1)) | |
4346 | return 1; | |
4347 | if ((start + len) & (PAGE_CACHE_SIZE - 1)) | |
4348 | return 1; | |
4349 | return 0; | |
4350 | } | |
4351 | ||
0b32f4bb | 4352 | int clear_extent_buffer_uptodate(struct extent_buffer *eb) |
1259ab75 CM |
4353 | { |
4354 | unsigned long i; | |
4355 | struct page *page; | |
4356 | unsigned long num_pages; | |
4357 | ||
b4ce94de | 4358 | clear_bit(EXTENT_BUFFER_UPTODATE, &eb->bflags); |
0b32f4bb | 4359 | num_pages = num_extent_pages(eb->start, eb->len); |
1259ab75 CM |
4360 | for (i = 0; i < num_pages; i++) { |
4361 | page = extent_buffer_page(eb, i); | |
33958dc6 CM |
4362 | if (page) |
4363 | ClearPageUptodate(page); | |
1259ab75 CM |
4364 | } |
4365 | return 0; | |
4366 | } | |
4367 | ||
0b32f4bb | 4368 | int set_extent_buffer_uptodate(struct extent_buffer *eb) |
d1310b2e CM |
4369 | { |
4370 | unsigned long i; | |
4371 | struct page *page; | |
4372 | unsigned long num_pages; | |
4373 | ||
0b32f4bb | 4374 | set_bit(EXTENT_BUFFER_UPTODATE, &eb->bflags); |
d1310b2e | 4375 | num_pages = num_extent_pages(eb->start, eb->len); |
d1310b2e CM |
4376 | for (i = 0; i < num_pages; i++) { |
4377 | page = extent_buffer_page(eb, i); | |
d1310b2e CM |
4378 | SetPageUptodate(page); |
4379 | } | |
4380 | return 0; | |
4381 | } | |
d1310b2e | 4382 | |
ce9adaa5 CM |
4383 | int extent_range_uptodate(struct extent_io_tree *tree, |
4384 | u64 start, u64 end) | |
4385 | { | |
4386 | struct page *page; | |
4387 | int ret; | |
4388 | int pg_uptodate = 1; | |
4389 | int uptodate; | |
4390 | unsigned long index; | |
4391 | ||
0b32f4bb | 4392 | if (range_straddles_pages(start, end - start + 1)) { |
19b6caf4 CM |
4393 | ret = test_range_bit(tree, start, end, |
4394 | EXTENT_UPTODATE, 1, NULL); | |
4395 | if (ret) | |
4396 | return 1; | |
4397 | } | |
d397712b | 4398 | while (start <= end) { |
ce9adaa5 CM |
4399 | index = start >> PAGE_CACHE_SHIFT; |
4400 | page = find_get_page(tree->mapping, index); | |
8bedd51b MH |
4401 | if (!page) |
4402 | return 1; | |
ce9adaa5 CM |
4403 | uptodate = PageUptodate(page); |
4404 | page_cache_release(page); | |
4405 | if (!uptodate) { | |
4406 | pg_uptodate = 0; | |
4407 | break; | |
4408 | } | |
4409 | start += PAGE_CACHE_SIZE; | |
4410 | } | |
4411 | return pg_uptodate; | |
4412 | } | |
4413 | ||
0b32f4bb | 4414 | int extent_buffer_uptodate(struct extent_buffer *eb) |
d1310b2e | 4415 | { |
0b32f4bb | 4416 | return test_bit(EXTENT_BUFFER_UPTODATE, &eb->bflags); |
d1310b2e | 4417 | } |
d1310b2e CM |
4418 | |
4419 | int read_extent_buffer_pages(struct extent_io_tree *tree, | |
bb82ab88 | 4420 | struct extent_buffer *eb, u64 start, int wait, |
f188591e | 4421 | get_extent_t *get_extent, int mirror_num) |
d1310b2e CM |
4422 | { |
4423 | unsigned long i; | |
4424 | unsigned long start_i; | |
4425 | struct page *page; | |
4426 | int err; | |
4427 | int ret = 0; | |
ce9adaa5 CM |
4428 | int locked_pages = 0; |
4429 | int all_uptodate = 1; | |
d1310b2e | 4430 | unsigned long num_pages; |
727011e0 | 4431 | unsigned long num_reads = 0; |
a86c12c7 | 4432 | struct bio *bio = NULL; |
c8b97818 | 4433 | unsigned long bio_flags = 0; |
a86c12c7 | 4434 | |
b4ce94de | 4435 | if (test_bit(EXTENT_BUFFER_UPTODATE, &eb->bflags)) |
d1310b2e CM |
4436 | return 0; |
4437 | ||
d1310b2e CM |
4438 | if (start) { |
4439 | WARN_ON(start < eb->start); | |
4440 | start_i = (start >> PAGE_CACHE_SHIFT) - | |
4441 | (eb->start >> PAGE_CACHE_SHIFT); | |
4442 | } else { | |
4443 | start_i = 0; | |
4444 | } | |
4445 | ||
4446 | num_pages = num_extent_pages(eb->start, eb->len); | |
4447 | for (i = start_i; i < num_pages; i++) { | |
4448 | page = extent_buffer_page(eb, i); | |
bb82ab88 | 4449 | if (wait == WAIT_NONE) { |
2db04966 | 4450 | if (!trylock_page(page)) |
ce9adaa5 | 4451 | goto unlock_exit; |
d1310b2e CM |
4452 | } else { |
4453 | lock_page(page); | |
4454 | } | |
ce9adaa5 | 4455 | locked_pages++; |
727011e0 CM |
4456 | if (!PageUptodate(page)) { |
4457 | num_reads++; | |
ce9adaa5 | 4458 | all_uptodate = 0; |
727011e0 | 4459 | } |
ce9adaa5 CM |
4460 | } |
4461 | if (all_uptodate) { | |
4462 | if (start_i == 0) | |
b4ce94de | 4463 | set_bit(EXTENT_BUFFER_UPTODATE, &eb->bflags); |
ce9adaa5 CM |
4464 | goto unlock_exit; |
4465 | } | |
4466 | ||
ea466794 JB |
4467 | clear_bit(EXTENT_BUFFER_IOERR, &eb->bflags); |
4468 | eb->failed_mirror = 0; | |
0b32f4bb | 4469 | atomic_set(&eb->io_pages, num_reads); |
ce9adaa5 CM |
4470 | for (i = start_i; i < num_pages; i++) { |
4471 | page = extent_buffer_page(eb, i); | |
ce9adaa5 | 4472 | if (!PageUptodate(page)) { |
f188591e | 4473 | ClearPageError(page); |
a86c12c7 | 4474 | err = __extent_read_full_page(tree, page, |
f188591e | 4475 | get_extent, &bio, |
c8b97818 | 4476 | mirror_num, &bio_flags); |
d397712b | 4477 | if (err) |
d1310b2e | 4478 | ret = err; |
d1310b2e CM |
4479 | } else { |
4480 | unlock_page(page); | |
4481 | } | |
4482 | } | |
4483 | ||
355808c2 JM |
4484 | if (bio) { |
4485 | err = submit_one_bio(READ, bio, mirror_num, bio_flags); | |
79787eaa JM |
4486 | if (err) |
4487 | return err; | |
355808c2 | 4488 | } |
a86c12c7 | 4489 | |
bb82ab88 | 4490 | if (ret || wait != WAIT_COMPLETE) |
d1310b2e | 4491 | return ret; |
d397712b | 4492 | |
d1310b2e CM |
4493 | for (i = start_i; i < num_pages; i++) { |
4494 | page = extent_buffer_page(eb, i); | |
4495 | wait_on_page_locked(page); | |
d397712b | 4496 | if (!PageUptodate(page)) |
d1310b2e | 4497 | ret = -EIO; |
d1310b2e | 4498 | } |
d397712b | 4499 | |
d1310b2e | 4500 | return ret; |
ce9adaa5 CM |
4501 | |
4502 | unlock_exit: | |
4503 | i = start_i; | |
d397712b | 4504 | while (locked_pages > 0) { |
ce9adaa5 CM |
4505 | page = extent_buffer_page(eb, i); |
4506 | i++; | |
4507 | unlock_page(page); | |
4508 | locked_pages--; | |
4509 | } | |
4510 | return ret; | |
d1310b2e | 4511 | } |
d1310b2e CM |
4512 | |
4513 | void read_extent_buffer(struct extent_buffer *eb, void *dstv, | |
4514 | unsigned long start, | |
4515 | unsigned long len) | |
4516 | { | |
4517 | size_t cur; | |
4518 | size_t offset; | |
4519 | struct page *page; | |
4520 | char *kaddr; | |
4521 | char *dst = (char *)dstv; | |
4522 | size_t start_offset = eb->start & ((u64)PAGE_CACHE_SIZE - 1); | |
4523 | unsigned long i = (start_offset + start) >> PAGE_CACHE_SHIFT; | |
d1310b2e CM |
4524 | |
4525 | WARN_ON(start > eb->len); | |
4526 | WARN_ON(start + len > eb->start + eb->len); | |
4527 | ||
4528 | offset = (start_offset + start) & ((unsigned long)PAGE_CACHE_SIZE - 1); | |
4529 | ||
d397712b | 4530 | while (len > 0) { |
d1310b2e | 4531 | page = extent_buffer_page(eb, i); |
d1310b2e CM |
4532 | |
4533 | cur = min(len, (PAGE_CACHE_SIZE - offset)); | |
a6591715 | 4534 | kaddr = page_address(page); |
d1310b2e | 4535 | memcpy(dst, kaddr + offset, cur); |
d1310b2e CM |
4536 | |
4537 | dst += cur; | |
4538 | len -= cur; | |
4539 | offset = 0; | |
4540 | i++; | |
4541 | } | |
4542 | } | |
d1310b2e CM |
4543 | |
4544 | int map_private_extent_buffer(struct extent_buffer *eb, unsigned long start, | |
a6591715 | 4545 | unsigned long min_len, char **map, |
d1310b2e | 4546 | unsigned long *map_start, |
a6591715 | 4547 | unsigned long *map_len) |
d1310b2e CM |
4548 | { |
4549 | size_t offset = start & (PAGE_CACHE_SIZE - 1); | |
4550 | char *kaddr; | |
4551 | struct page *p; | |
4552 | size_t start_offset = eb->start & ((u64)PAGE_CACHE_SIZE - 1); | |
4553 | unsigned long i = (start_offset + start) >> PAGE_CACHE_SHIFT; | |
4554 | unsigned long end_i = (start_offset + start + min_len - 1) >> | |
4555 | PAGE_CACHE_SHIFT; | |
4556 | ||
4557 | if (i != end_i) | |
4558 | return -EINVAL; | |
4559 | ||
4560 | if (i == 0) { | |
4561 | offset = start_offset; | |
4562 | *map_start = 0; | |
4563 | } else { | |
4564 | offset = 0; | |
4565 | *map_start = ((u64)i << PAGE_CACHE_SHIFT) - start_offset; | |
4566 | } | |
d397712b | 4567 | |
d1310b2e | 4568 | if (start + min_len > eb->len) { |
d397712b CM |
4569 | printk(KERN_ERR "btrfs bad mapping eb start %llu len %lu, " |
4570 | "wanted %lu %lu\n", (unsigned long long)eb->start, | |
4571 | eb->len, start, min_len); | |
d1310b2e | 4572 | WARN_ON(1); |
85026533 | 4573 | return -EINVAL; |
d1310b2e CM |
4574 | } |
4575 | ||
4576 | p = extent_buffer_page(eb, i); | |
a6591715 | 4577 | kaddr = page_address(p); |
d1310b2e CM |
4578 | *map = kaddr + offset; |
4579 | *map_len = PAGE_CACHE_SIZE - offset; | |
4580 | return 0; | |
4581 | } | |
d1310b2e | 4582 | |
d1310b2e CM |
4583 | int memcmp_extent_buffer(struct extent_buffer *eb, const void *ptrv, |
4584 | unsigned long start, | |
4585 | unsigned long len) | |
4586 | { | |
4587 | size_t cur; | |
4588 | size_t offset; | |
4589 | struct page *page; | |
4590 | char *kaddr; | |
4591 | char *ptr = (char *)ptrv; | |
4592 | size_t start_offset = eb->start & ((u64)PAGE_CACHE_SIZE - 1); | |
4593 | unsigned long i = (start_offset + start) >> PAGE_CACHE_SHIFT; | |
4594 | int ret = 0; | |
4595 | ||
4596 | WARN_ON(start > eb->len); | |
4597 | WARN_ON(start + len > eb->start + eb->len); | |
4598 | ||
4599 | offset = (start_offset + start) & ((unsigned long)PAGE_CACHE_SIZE - 1); | |
4600 | ||
d397712b | 4601 | while (len > 0) { |
d1310b2e | 4602 | page = extent_buffer_page(eb, i); |
d1310b2e CM |
4603 | |
4604 | cur = min(len, (PAGE_CACHE_SIZE - offset)); | |
4605 | ||
a6591715 | 4606 | kaddr = page_address(page); |
d1310b2e | 4607 | ret = memcmp(ptr, kaddr + offset, cur); |
d1310b2e CM |
4608 | if (ret) |
4609 | break; | |
4610 | ||
4611 | ptr += cur; | |
4612 | len -= cur; | |
4613 | offset = 0; | |
4614 | i++; | |
4615 | } | |
4616 | return ret; | |
4617 | } | |
d1310b2e CM |
4618 | |
4619 | void write_extent_buffer(struct extent_buffer *eb, const void *srcv, | |
4620 | unsigned long start, unsigned long len) | |
4621 | { | |
4622 | size_t cur; | |
4623 | size_t offset; | |
4624 | struct page *page; | |
4625 | char *kaddr; | |
4626 | char *src = (char *)srcv; | |
4627 | size_t start_offset = eb->start & ((u64)PAGE_CACHE_SIZE - 1); | |
4628 | unsigned long i = (start_offset + start) >> PAGE_CACHE_SHIFT; | |
4629 | ||
4630 | WARN_ON(start > eb->len); | |
4631 | WARN_ON(start + len > eb->start + eb->len); | |
4632 | ||
4633 | offset = (start_offset + start) & ((unsigned long)PAGE_CACHE_SIZE - 1); | |
4634 | ||
d397712b | 4635 | while (len > 0) { |
d1310b2e CM |
4636 | page = extent_buffer_page(eb, i); |
4637 | WARN_ON(!PageUptodate(page)); | |
4638 | ||
4639 | cur = min(len, PAGE_CACHE_SIZE - offset); | |
a6591715 | 4640 | kaddr = page_address(page); |
d1310b2e | 4641 | memcpy(kaddr + offset, src, cur); |
d1310b2e CM |
4642 | |
4643 | src += cur; | |
4644 | len -= cur; | |
4645 | offset = 0; | |
4646 | i++; | |
4647 | } | |
4648 | } | |
d1310b2e CM |
4649 | |
4650 | void memset_extent_buffer(struct extent_buffer *eb, char c, | |
4651 | unsigned long start, unsigned long len) | |
4652 | { | |
4653 | size_t cur; | |
4654 | size_t offset; | |
4655 | struct page *page; | |
4656 | char *kaddr; | |
4657 | size_t start_offset = eb->start & ((u64)PAGE_CACHE_SIZE - 1); | |
4658 | unsigned long i = (start_offset + start) >> PAGE_CACHE_SHIFT; | |
4659 | ||
4660 | WARN_ON(start > eb->len); | |
4661 | WARN_ON(start + len > eb->start + eb->len); | |
4662 | ||
4663 | offset = (start_offset + start) & ((unsigned long)PAGE_CACHE_SIZE - 1); | |
4664 | ||
d397712b | 4665 | while (len > 0) { |
d1310b2e CM |
4666 | page = extent_buffer_page(eb, i); |
4667 | WARN_ON(!PageUptodate(page)); | |
4668 | ||
4669 | cur = min(len, PAGE_CACHE_SIZE - offset); | |
a6591715 | 4670 | kaddr = page_address(page); |
d1310b2e | 4671 | memset(kaddr + offset, c, cur); |
d1310b2e CM |
4672 | |
4673 | len -= cur; | |
4674 | offset = 0; | |
4675 | i++; | |
4676 | } | |
4677 | } | |
d1310b2e CM |
4678 | |
4679 | void copy_extent_buffer(struct extent_buffer *dst, struct extent_buffer *src, | |
4680 | unsigned long dst_offset, unsigned long src_offset, | |
4681 | unsigned long len) | |
4682 | { | |
4683 | u64 dst_len = dst->len; | |
4684 | size_t cur; | |
4685 | size_t offset; | |
4686 | struct page *page; | |
4687 | char *kaddr; | |
4688 | size_t start_offset = dst->start & ((u64)PAGE_CACHE_SIZE - 1); | |
4689 | unsigned long i = (start_offset + dst_offset) >> PAGE_CACHE_SHIFT; | |
4690 | ||
4691 | WARN_ON(src->len != dst_len); | |
4692 | ||
4693 | offset = (start_offset + dst_offset) & | |
4694 | ((unsigned long)PAGE_CACHE_SIZE - 1); | |
4695 | ||
d397712b | 4696 | while (len > 0) { |
d1310b2e CM |
4697 | page = extent_buffer_page(dst, i); |
4698 | WARN_ON(!PageUptodate(page)); | |
4699 | ||
4700 | cur = min(len, (unsigned long)(PAGE_CACHE_SIZE - offset)); | |
4701 | ||
a6591715 | 4702 | kaddr = page_address(page); |
d1310b2e | 4703 | read_extent_buffer(src, kaddr + offset, src_offset, cur); |
d1310b2e CM |
4704 | |
4705 | src_offset += cur; | |
4706 | len -= cur; | |
4707 | offset = 0; | |
4708 | i++; | |
4709 | } | |
4710 | } | |
d1310b2e CM |
4711 | |
4712 | static void move_pages(struct page *dst_page, struct page *src_page, | |
4713 | unsigned long dst_off, unsigned long src_off, | |
4714 | unsigned long len) | |
4715 | { | |
a6591715 | 4716 | char *dst_kaddr = page_address(dst_page); |
d1310b2e CM |
4717 | if (dst_page == src_page) { |
4718 | memmove(dst_kaddr + dst_off, dst_kaddr + src_off, len); | |
4719 | } else { | |
a6591715 | 4720 | char *src_kaddr = page_address(src_page); |
d1310b2e CM |
4721 | char *p = dst_kaddr + dst_off + len; |
4722 | char *s = src_kaddr + src_off + len; | |
4723 | ||
4724 | while (len--) | |
4725 | *--p = *--s; | |
d1310b2e | 4726 | } |
d1310b2e CM |
4727 | } |
4728 | ||
3387206f ST |
4729 | static inline bool areas_overlap(unsigned long src, unsigned long dst, unsigned long len) |
4730 | { | |
4731 | unsigned long distance = (src > dst) ? src - dst : dst - src; | |
4732 | return distance < len; | |
4733 | } | |
4734 | ||
d1310b2e CM |
4735 | static void copy_pages(struct page *dst_page, struct page *src_page, |
4736 | unsigned long dst_off, unsigned long src_off, | |
4737 | unsigned long len) | |
4738 | { | |
a6591715 | 4739 | char *dst_kaddr = page_address(dst_page); |
d1310b2e | 4740 | char *src_kaddr; |
727011e0 | 4741 | int must_memmove = 0; |
d1310b2e | 4742 | |
3387206f | 4743 | if (dst_page != src_page) { |
a6591715 | 4744 | src_kaddr = page_address(src_page); |
3387206f | 4745 | } else { |
d1310b2e | 4746 | src_kaddr = dst_kaddr; |
727011e0 CM |
4747 | if (areas_overlap(src_off, dst_off, len)) |
4748 | must_memmove = 1; | |
3387206f | 4749 | } |
d1310b2e | 4750 | |
727011e0 CM |
4751 | if (must_memmove) |
4752 | memmove(dst_kaddr + dst_off, src_kaddr + src_off, len); | |
4753 | else | |
4754 | memcpy(dst_kaddr + dst_off, src_kaddr + src_off, len); | |
d1310b2e CM |
4755 | } |
4756 | ||
4757 | void memcpy_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset, | |
4758 | unsigned long src_offset, unsigned long len) | |
4759 | { | |
4760 | size_t cur; | |
4761 | size_t dst_off_in_page; | |
4762 | size_t src_off_in_page; | |
4763 | size_t start_offset = dst->start & ((u64)PAGE_CACHE_SIZE - 1); | |
4764 | unsigned long dst_i; | |
4765 | unsigned long src_i; | |
4766 | ||
4767 | if (src_offset + len > dst->len) { | |
d397712b CM |
4768 | printk(KERN_ERR "btrfs memmove bogus src_offset %lu move " |
4769 | "len %lu dst len %lu\n", src_offset, len, dst->len); | |
d1310b2e CM |
4770 | BUG_ON(1); |
4771 | } | |
4772 | if (dst_offset + len > dst->len) { | |
d397712b CM |
4773 | printk(KERN_ERR "btrfs memmove bogus dst_offset %lu move " |
4774 | "len %lu dst len %lu\n", dst_offset, len, dst->len); | |
d1310b2e CM |
4775 | BUG_ON(1); |
4776 | } | |
4777 | ||
d397712b | 4778 | while (len > 0) { |
d1310b2e CM |
4779 | dst_off_in_page = (start_offset + dst_offset) & |
4780 | ((unsigned long)PAGE_CACHE_SIZE - 1); | |
4781 | src_off_in_page = (start_offset + src_offset) & | |
4782 | ((unsigned long)PAGE_CACHE_SIZE - 1); | |
4783 | ||
4784 | dst_i = (start_offset + dst_offset) >> PAGE_CACHE_SHIFT; | |
4785 | src_i = (start_offset + src_offset) >> PAGE_CACHE_SHIFT; | |
4786 | ||
4787 | cur = min(len, (unsigned long)(PAGE_CACHE_SIZE - | |
4788 | src_off_in_page)); | |
4789 | cur = min_t(unsigned long, cur, | |
4790 | (unsigned long)(PAGE_CACHE_SIZE - dst_off_in_page)); | |
4791 | ||
4792 | copy_pages(extent_buffer_page(dst, dst_i), | |
4793 | extent_buffer_page(dst, src_i), | |
4794 | dst_off_in_page, src_off_in_page, cur); | |
4795 | ||
4796 | src_offset += cur; | |
4797 | dst_offset += cur; | |
4798 | len -= cur; | |
4799 | } | |
4800 | } | |
d1310b2e CM |
4801 | |
4802 | void memmove_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset, | |
4803 | unsigned long src_offset, unsigned long len) | |
4804 | { | |
4805 | size_t cur; | |
4806 | size_t dst_off_in_page; | |
4807 | size_t src_off_in_page; | |
4808 | unsigned long dst_end = dst_offset + len - 1; | |
4809 | unsigned long src_end = src_offset + len - 1; | |
4810 | size_t start_offset = dst->start & ((u64)PAGE_CACHE_SIZE - 1); | |
4811 | unsigned long dst_i; | |
4812 | unsigned long src_i; | |
4813 | ||
4814 | if (src_offset + len > dst->len) { | |
d397712b CM |
4815 | printk(KERN_ERR "btrfs memmove bogus src_offset %lu move " |
4816 | "len %lu len %lu\n", src_offset, len, dst->len); | |
d1310b2e CM |
4817 | BUG_ON(1); |
4818 | } | |
4819 | if (dst_offset + len > dst->len) { | |
d397712b CM |
4820 | printk(KERN_ERR "btrfs memmove bogus dst_offset %lu move " |
4821 | "len %lu len %lu\n", dst_offset, len, dst->len); | |
d1310b2e CM |
4822 | BUG_ON(1); |
4823 | } | |
727011e0 | 4824 | if (dst_offset < src_offset) { |
d1310b2e CM |
4825 | memcpy_extent_buffer(dst, dst_offset, src_offset, len); |
4826 | return; | |
4827 | } | |
d397712b | 4828 | while (len > 0) { |
d1310b2e CM |
4829 | dst_i = (start_offset + dst_end) >> PAGE_CACHE_SHIFT; |
4830 | src_i = (start_offset + src_end) >> PAGE_CACHE_SHIFT; | |
4831 | ||
4832 | dst_off_in_page = (start_offset + dst_end) & | |
4833 | ((unsigned long)PAGE_CACHE_SIZE - 1); | |
4834 | src_off_in_page = (start_offset + src_end) & | |
4835 | ((unsigned long)PAGE_CACHE_SIZE - 1); | |
4836 | ||
4837 | cur = min_t(unsigned long, len, src_off_in_page + 1); | |
4838 | cur = min(cur, dst_off_in_page + 1); | |
4839 | move_pages(extent_buffer_page(dst, dst_i), | |
4840 | extent_buffer_page(dst, src_i), | |
4841 | dst_off_in_page - cur + 1, | |
4842 | src_off_in_page - cur + 1, cur); | |
4843 | ||
4844 | dst_end -= cur; | |
4845 | src_end -= cur; | |
4846 | len -= cur; | |
4847 | } | |
4848 | } | |
6af118ce | 4849 | |
3083ee2e | 4850 | int try_release_extent_buffer(struct page *page, gfp_t mask) |
6af118ce | 4851 | { |
3083ee2e | 4852 | struct extent_buffer *eb; |
6af118ce | 4853 | |
3083ee2e JB |
4854 | /* |
4855 | * We need to make sure noboody is attaching this page to an eb right | |
4856 | * now. | |
4857 | */ | |
4858 | spin_lock(&page->mapping->private_lock); | |
4859 | if (!PagePrivate(page)) { | |
4860 | spin_unlock(&page->mapping->private_lock); | |
4f2de97a | 4861 | return 1; |
3083ee2e | 4862 | } |
6af118ce | 4863 | |
3083ee2e JB |
4864 | eb = (struct extent_buffer *)page->private; |
4865 | BUG_ON(!eb); | |
4866 | ||
0b32f4bb | 4867 | /* |
3083ee2e JB |
4868 | * This is a little awful but should be ok, we need to make sure that |
4869 | * the eb doesn't disappear out from under us while we're looking at | |
4870 | * this page. | |
4871 | */ | |
4872 | spin_lock(&eb->refs_lock); | |
0b32f4bb | 4873 | if (atomic_read(&eb->refs) != 1 || extent_buffer_under_io(eb)) { |
3083ee2e JB |
4874 | spin_unlock(&eb->refs_lock); |
4875 | spin_unlock(&page->mapping->private_lock); | |
4876 | return 0; | |
6af118ce | 4877 | } |
3083ee2e JB |
4878 | spin_unlock(&page->mapping->private_lock); |
4879 | ||
4880 | if ((mask & GFP_NOFS) == GFP_NOFS) | |
4881 | mask = GFP_NOFS; | |
19fe0a8b MX |
4882 | |
4883 | /* | |
3083ee2e JB |
4884 | * If tree ref isn't set then we know the ref on this eb is a real ref, |
4885 | * so just return, this page will likely be freed soon anyway. | |
19fe0a8b | 4886 | */ |
3083ee2e JB |
4887 | if (!test_and_clear_bit(EXTENT_BUFFER_TREE_REF, &eb->bflags)) { |
4888 | spin_unlock(&eb->refs_lock); | |
4889 | return 0; | |
b9473439 | 4890 | } |
3083ee2e | 4891 | release_extent_buffer(eb, mask); |
19fe0a8b | 4892 | |
3083ee2e | 4893 | return 1; |
6af118ce | 4894 | } |