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 | ||
d1310b2e CM |
189 | rb_link_node(node, parent, p); |
190 | rb_insert_color(node, root); | |
191 | return NULL; | |
192 | } | |
193 | ||
80ea96b1 | 194 | static struct rb_node *__etree_search(struct extent_io_tree *tree, u64 offset, |
d1310b2e CM |
195 | struct rb_node **prev_ret, |
196 | struct rb_node **next_ret) | |
197 | { | |
80ea96b1 | 198 | struct rb_root *root = &tree->state; |
d397712b | 199 | struct rb_node *n = root->rb_node; |
d1310b2e CM |
200 | struct rb_node *prev = NULL; |
201 | struct rb_node *orig_prev = NULL; | |
202 | struct tree_entry *entry; | |
203 | struct tree_entry *prev_entry = NULL; | |
204 | ||
d397712b | 205 | while (n) { |
d1310b2e CM |
206 | entry = rb_entry(n, struct tree_entry, rb_node); |
207 | prev = n; | |
208 | prev_entry = entry; | |
209 | ||
210 | if (offset < entry->start) | |
211 | n = n->rb_left; | |
212 | else if (offset > entry->end) | |
213 | n = n->rb_right; | |
d397712b | 214 | else |
d1310b2e CM |
215 | return n; |
216 | } | |
217 | ||
218 | if (prev_ret) { | |
219 | orig_prev = prev; | |
d397712b | 220 | while (prev && offset > prev_entry->end) { |
d1310b2e CM |
221 | prev = rb_next(prev); |
222 | prev_entry = rb_entry(prev, struct tree_entry, rb_node); | |
223 | } | |
224 | *prev_ret = prev; | |
225 | prev = orig_prev; | |
226 | } | |
227 | ||
228 | if (next_ret) { | |
229 | prev_entry = rb_entry(prev, struct tree_entry, rb_node); | |
d397712b | 230 | while (prev && offset < prev_entry->start) { |
d1310b2e CM |
231 | prev = rb_prev(prev); |
232 | prev_entry = rb_entry(prev, struct tree_entry, rb_node); | |
233 | } | |
234 | *next_ret = prev; | |
235 | } | |
236 | return NULL; | |
237 | } | |
238 | ||
80ea96b1 CM |
239 | static inline struct rb_node *tree_search(struct extent_io_tree *tree, |
240 | u64 offset) | |
d1310b2e | 241 | { |
70dec807 | 242 | struct rb_node *prev = NULL; |
d1310b2e | 243 | struct rb_node *ret; |
70dec807 | 244 | |
80ea96b1 | 245 | ret = __etree_search(tree, offset, &prev, NULL); |
d397712b | 246 | if (!ret) |
d1310b2e CM |
247 | return prev; |
248 | return ret; | |
249 | } | |
250 | ||
9ed74f2d JB |
251 | static void merge_cb(struct extent_io_tree *tree, struct extent_state *new, |
252 | struct extent_state *other) | |
253 | { | |
254 | if (tree->ops && tree->ops->merge_extent_hook) | |
255 | tree->ops->merge_extent_hook(tree->mapping->host, new, | |
256 | other); | |
257 | } | |
258 | ||
d1310b2e CM |
259 | /* |
260 | * utility function to look for merge candidates inside a given range. | |
261 | * Any extents with matching state are merged together into a single | |
262 | * extent in the tree. Extents with EXTENT_IO in their state field | |
263 | * are not merged because the end_io handlers need to be able to do | |
264 | * operations on them without sleeping (or doing allocations/splits). | |
265 | * | |
266 | * This should be called with the tree lock held. | |
267 | */ | |
1bf85046 JM |
268 | static void merge_state(struct extent_io_tree *tree, |
269 | struct extent_state *state) | |
d1310b2e CM |
270 | { |
271 | struct extent_state *other; | |
272 | struct rb_node *other_node; | |
273 | ||
5b21f2ed | 274 | if (state->state & (EXTENT_IOBITS | EXTENT_BOUNDARY)) |
1bf85046 | 275 | return; |
d1310b2e CM |
276 | |
277 | other_node = rb_prev(&state->rb_node); | |
278 | if (other_node) { | |
279 | other = rb_entry(other_node, struct extent_state, rb_node); | |
280 | if (other->end == state->start - 1 && | |
281 | other->state == state->state) { | |
9ed74f2d | 282 | merge_cb(tree, state, other); |
d1310b2e | 283 | state->start = other->start; |
70dec807 | 284 | other->tree = NULL; |
d1310b2e CM |
285 | rb_erase(&other->rb_node, &tree->state); |
286 | free_extent_state(other); | |
287 | } | |
288 | } | |
289 | other_node = rb_next(&state->rb_node); | |
290 | if (other_node) { | |
291 | other = rb_entry(other_node, struct extent_state, rb_node); | |
292 | if (other->start == state->end + 1 && | |
293 | other->state == state->state) { | |
9ed74f2d | 294 | merge_cb(tree, state, other); |
df98b6e2 JB |
295 | state->end = other->end; |
296 | other->tree = NULL; | |
297 | rb_erase(&other->rb_node, &tree->state); | |
298 | free_extent_state(other); | |
d1310b2e CM |
299 | } |
300 | } | |
d1310b2e CM |
301 | } |
302 | ||
1bf85046 | 303 | static void set_state_cb(struct extent_io_tree *tree, |
0ca1f7ce | 304 | struct extent_state *state, int *bits) |
291d673e | 305 | { |
1bf85046 JM |
306 | if (tree->ops && tree->ops->set_bit_hook) |
307 | tree->ops->set_bit_hook(tree->mapping->host, state, bits); | |
291d673e CM |
308 | } |
309 | ||
310 | static void clear_state_cb(struct extent_io_tree *tree, | |
0ca1f7ce | 311 | struct extent_state *state, int *bits) |
291d673e | 312 | { |
9ed74f2d JB |
313 | if (tree->ops && tree->ops->clear_bit_hook) |
314 | tree->ops->clear_bit_hook(tree->mapping->host, state, bits); | |
291d673e CM |
315 | } |
316 | ||
3150b699 XG |
317 | static void set_state_bits(struct extent_io_tree *tree, |
318 | struct extent_state *state, int *bits); | |
319 | ||
d1310b2e CM |
320 | /* |
321 | * insert an extent_state struct into the tree. 'bits' are set on the | |
322 | * struct before it is inserted. | |
323 | * | |
324 | * This may return -EEXIST if the extent is already there, in which case the | |
325 | * state struct is freed. | |
326 | * | |
327 | * The tree lock is not taken internally. This is a utility function and | |
328 | * probably isn't what you want to call (see set/clear_extent_bit). | |
329 | */ | |
330 | static int insert_state(struct extent_io_tree *tree, | |
331 | struct extent_state *state, u64 start, u64 end, | |
0ca1f7ce | 332 | int *bits) |
d1310b2e CM |
333 | { |
334 | struct rb_node *node; | |
335 | ||
336 | if (end < start) { | |
d397712b CM |
337 | printk(KERN_ERR "btrfs end < start %llu %llu\n", |
338 | (unsigned long long)end, | |
339 | (unsigned long long)start); | |
d1310b2e CM |
340 | WARN_ON(1); |
341 | } | |
d1310b2e CM |
342 | state->start = start; |
343 | state->end = end; | |
9ed74f2d | 344 | |
3150b699 XG |
345 | set_state_bits(tree, state, bits); |
346 | ||
d1310b2e CM |
347 | node = tree_insert(&tree->state, end, &state->rb_node); |
348 | if (node) { | |
349 | struct extent_state *found; | |
350 | found = rb_entry(node, struct extent_state, rb_node); | |
d397712b CM |
351 | printk(KERN_ERR "btrfs found node %llu %llu on insert of " |
352 | "%llu %llu\n", (unsigned long long)found->start, | |
353 | (unsigned long long)found->end, | |
354 | (unsigned long long)start, (unsigned long long)end); | |
d1310b2e CM |
355 | return -EEXIST; |
356 | } | |
70dec807 | 357 | state->tree = tree; |
d1310b2e CM |
358 | merge_state(tree, state); |
359 | return 0; | |
360 | } | |
361 | ||
1bf85046 | 362 | static void split_cb(struct extent_io_tree *tree, struct extent_state *orig, |
9ed74f2d JB |
363 | u64 split) |
364 | { | |
365 | if (tree->ops && tree->ops->split_extent_hook) | |
1bf85046 | 366 | tree->ops->split_extent_hook(tree->mapping->host, orig, split); |
9ed74f2d JB |
367 | } |
368 | ||
d1310b2e CM |
369 | /* |
370 | * split a given extent state struct in two, inserting the preallocated | |
371 | * struct 'prealloc' as the newly created second half. 'split' indicates an | |
372 | * offset inside 'orig' where it should be split. | |
373 | * | |
374 | * Before calling, | |
375 | * the tree has 'orig' at [orig->start, orig->end]. After calling, there | |
376 | * are two extent state structs in the tree: | |
377 | * prealloc: [orig->start, split - 1] | |
378 | * orig: [ split, orig->end ] | |
379 | * | |
380 | * The tree locks are not taken by this function. They need to be held | |
381 | * by the caller. | |
382 | */ | |
383 | static int split_state(struct extent_io_tree *tree, struct extent_state *orig, | |
384 | struct extent_state *prealloc, u64 split) | |
385 | { | |
386 | struct rb_node *node; | |
9ed74f2d JB |
387 | |
388 | split_cb(tree, orig, split); | |
389 | ||
d1310b2e CM |
390 | prealloc->start = orig->start; |
391 | prealloc->end = split - 1; | |
392 | prealloc->state = orig->state; | |
393 | orig->start = split; | |
394 | ||
395 | node = tree_insert(&tree->state, prealloc->end, &prealloc->rb_node); | |
396 | if (node) { | |
d1310b2e CM |
397 | free_extent_state(prealloc); |
398 | return -EEXIST; | |
399 | } | |
70dec807 | 400 | prealloc->tree = tree; |
d1310b2e CM |
401 | return 0; |
402 | } | |
403 | ||
cdc6a395 LZ |
404 | static struct extent_state *next_state(struct extent_state *state) |
405 | { | |
406 | struct rb_node *next = rb_next(&state->rb_node); | |
407 | if (next) | |
408 | return rb_entry(next, struct extent_state, rb_node); | |
409 | else | |
410 | return NULL; | |
411 | } | |
412 | ||
d1310b2e CM |
413 | /* |
414 | * utility function to clear some bits in an extent state struct. | |
1b303fc0 | 415 | * it will optionally wake up any one waiting on this state (wake == 1). |
d1310b2e CM |
416 | * |
417 | * If no bits are set on the state struct after clearing things, the | |
418 | * struct is freed and removed from the tree | |
419 | */ | |
cdc6a395 LZ |
420 | static struct extent_state *clear_state_bit(struct extent_io_tree *tree, |
421 | struct extent_state *state, | |
422 | int *bits, int wake) | |
d1310b2e | 423 | { |
cdc6a395 | 424 | struct extent_state *next; |
0ca1f7ce | 425 | int bits_to_clear = *bits & ~EXTENT_CTLBITS; |
d1310b2e | 426 | |
0ca1f7ce | 427 | if ((bits_to_clear & EXTENT_DIRTY) && (state->state & EXTENT_DIRTY)) { |
d1310b2e CM |
428 | u64 range = state->end - state->start + 1; |
429 | WARN_ON(range > tree->dirty_bytes); | |
430 | tree->dirty_bytes -= range; | |
431 | } | |
291d673e | 432 | clear_state_cb(tree, state, bits); |
32c00aff | 433 | state->state &= ~bits_to_clear; |
d1310b2e CM |
434 | if (wake) |
435 | wake_up(&state->wq); | |
0ca1f7ce | 436 | if (state->state == 0) { |
cdc6a395 | 437 | next = next_state(state); |
70dec807 | 438 | if (state->tree) { |
d1310b2e | 439 | rb_erase(&state->rb_node, &tree->state); |
70dec807 | 440 | state->tree = NULL; |
d1310b2e CM |
441 | free_extent_state(state); |
442 | } else { | |
443 | WARN_ON(1); | |
444 | } | |
445 | } else { | |
446 | merge_state(tree, state); | |
cdc6a395 | 447 | next = next_state(state); |
d1310b2e | 448 | } |
cdc6a395 | 449 | return next; |
d1310b2e CM |
450 | } |
451 | ||
8233767a XG |
452 | static struct extent_state * |
453 | alloc_extent_state_atomic(struct extent_state *prealloc) | |
454 | { | |
455 | if (!prealloc) | |
456 | prealloc = alloc_extent_state(GFP_ATOMIC); | |
457 | ||
458 | return prealloc; | |
459 | } | |
460 | ||
c2d904e0 JM |
461 | void extent_io_tree_panic(struct extent_io_tree *tree, int err) |
462 | { | |
463 | btrfs_panic(tree_fs_info(tree), err, "Locking error: " | |
464 | "Extent tree was modified by another " | |
465 | "thread while locked."); | |
466 | } | |
467 | ||
d1310b2e CM |
468 | /* |
469 | * clear some bits on a range in the tree. This may require splitting | |
470 | * or inserting elements in the tree, so the gfp mask is used to | |
471 | * indicate which allocations or sleeping are allowed. | |
472 | * | |
473 | * pass 'wake' == 1 to kick any sleepers, and 'delete' == 1 to remove | |
474 | * the given range from the tree regardless of state (ie for truncate). | |
475 | * | |
476 | * the range [start, end] is inclusive. | |
477 | * | |
6763af84 | 478 | * This takes the tree lock, and returns 0 on success and < 0 on error. |
d1310b2e CM |
479 | */ |
480 | int clear_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, | |
2c64c53d CM |
481 | int bits, int wake, int delete, |
482 | struct extent_state **cached_state, | |
483 | gfp_t mask) | |
d1310b2e CM |
484 | { |
485 | struct extent_state *state; | |
2c64c53d | 486 | struct extent_state *cached; |
d1310b2e CM |
487 | struct extent_state *prealloc = NULL; |
488 | struct rb_node *node; | |
5c939df5 | 489 | u64 last_end; |
d1310b2e | 490 | int err; |
2ac55d41 | 491 | int clear = 0; |
d1310b2e | 492 | |
0ca1f7ce YZ |
493 | if (delete) |
494 | bits |= ~EXTENT_CTLBITS; | |
495 | bits |= EXTENT_FIRST_DELALLOC; | |
496 | ||
2ac55d41 JB |
497 | if (bits & (EXTENT_IOBITS | EXTENT_BOUNDARY)) |
498 | clear = 1; | |
d1310b2e CM |
499 | again: |
500 | if (!prealloc && (mask & __GFP_WAIT)) { | |
501 | prealloc = alloc_extent_state(mask); | |
502 | if (!prealloc) | |
503 | return -ENOMEM; | |
504 | } | |
505 | ||
cad321ad | 506 | spin_lock(&tree->lock); |
2c64c53d CM |
507 | if (cached_state) { |
508 | cached = *cached_state; | |
2ac55d41 JB |
509 | |
510 | if (clear) { | |
511 | *cached_state = NULL; | |
512 | cached_state = NULL; | |
513 | } | |
514 | ||
df98b6e2 JB |
515 | if (cached && cached->tree && cached->start <= start && |
516 | cached->end > start) { | |
2ac55d41 JB |
517 | if (clear) |
518 | atomic_dec(&cached->refs); | |
2c64c53d | 519 | state = cached; |
42daec29 | 520 | goto hit_next; |
2c64c53d | 521 | } |
2ac55d41 JB |
522 | if (clear) |
523 | free_extent_state(cached); | |
2c64c53d | 524 | } |
d1310b2e CM |
525 | /* |
526 | * this search will find the extents that end after | |
527 | * our range starts | |
528 | */ | |
80ea96b1 | 529 | node = tree_search(tree, start); |
d1310b2e CM |
530 | if (!node) |
531 | goto out; | |
532 | state = rb_entry(node, struct extent_state, rb_node); | |
2c64c53d | 533 | hit_next: |
d1310b2e CM |
534 | if (state->start > end) |
535 | goto out; | |
536 | WARN_ON(state->end < start); | |
5c939df5 | 537 | last_end = state->end; |
d1310b2e | 538 | |
0449314a | 539 | /* the state doesn't have the wanted bits, go ahead */ |
cdc6a395 LZ |
540 | if (!(state->state & bits)) { |
541 | state = next_state(state); | |
0449314a | 542 | goto next; |
cdc6a395 | 543 | } |
0449314a | 544 | |
d1310b2e CM |
545 | /* |
546 | * | ---- desired range ---- | | |
547 | * | state | or | |
548 | * | ------------- state -------------- | | |
549 | * | |
550 | * We need to split the extent we found, and may flip | |
551 | * bits on second half. | |
552 | * | |
553 | * If the extent we found extends past our range, we | |
554 | * just split and search again. It'll get split again | |
555 | * the next time though. | |
556 | * | |
557 | * If the extent we found is inside our range, we clear | |
558 | * the desired bit on it. | |
559 | */ | |
560 | ||
561 | if (state->start < start) { | |
8233767a XG |
562 | prealloc = alloc_extent_state_atomic(prealloc); |
563 | BUG_ON(!prealloc); | |
d1310b2e | 564 | err = split_state(tree, state, prealloc, start); |
c2d904e0 JM |
565 | if (err) |
566 | extent_io_tree_panic(tree, err); | |
567 | ||
d1310b2e CM |
568 | prealloc = NULL; |
569 | if (err) | |
570 | goto out; | |
571 | if (state->end <= end) { | |
6763af84 | 572 | clear_state_bit(tree, state, &bits, wake); |
5c939df5 YZ |
573 | if (last_end == (u64)-1) |
574 | goto out; | |
575 | start = last_end + 1; | |
d1310b2e CM |
576 | } |
577 | goto search_again; | |
578 | } | |
579 | /* | |
580 | * | ---- desired range ---- | | |
581 | * | state | | |
582 | * We need to split the extent, and clear the bit | |
583 | * on the first half | |
584 | */ | |
585 | if (state->start <= end && state->end > end) { | |
8233767a XG |
586 | prealloc = alloc_extent_state_atomic(prealloc); |
587 | BUG_ON(!prealloc); | |
d1310b2e | 588 | err = split_state(tree, state, prealloc, end + 1); |
c2d904e0 JM |
589 | if (err) |
590 | extent_io_tree_panic(tree, err); | |
591 | ||
d1310b2e CM |
592 | if (wake) |
593 | wake_up(&state->wq); | |
42daec29 | 594 | |
6763af84 | 595 | clear_state_bit(tree, prealloc, &bits, wake); |
9ed74f2d | 596 | |
d1310b2e CM |
597 | prealloc = NULL; |
598 | goto out; | |
599 | } | |
42daec29 | 600 | |
cdc6a395 | 601 | state = clear_state_bit(tree, state, &bits, wake); |
0449314a | 602 | next: |
5c939df5 YZ |
603 | if (last_end == (u64)-1) |
604 | goto out; | |
605 | start = last_end + 1; | |
cdc6a395 | 606 | if (start <= end && state && !need_resched()) |
692e5759 | 607 | goto hit_next; |
d1310b2e CM |
608 | goto search_again; |
609 | ||
610 | out: | |
cad321ad | 611 | spin_unlock(&tree->lock); |
d1310b2e CM |
612 | if (prealloc) |
613 | free_extent_state(prealloc); | |
614 | ||
6763af84 | 615 | return 0; |
d1310b2e CM |
616 | |
617 | search_again: | |
618 | if (start > end) | |
619 | goto out; | |
cad321ad | 620 | spin_unlock(&tree->lock); |
d1310b2e CM |
621 | if (mask & __GFP_WAIT) |
622 | cond_resched(); | |
623 | goto again; | |
624 | } | |
d1310b2e | 625 | |
143bede5 JM |
626 | static void wait_on_state(struct extent_io_tree *tree, |
627 | struct extent_state *state) | |
641f5219 CH |
628 | __releases(tree->lock) |
629 | __acquires(tree->lock) | |
d1310b2e CM |
630 | { |
631 | DEFINE_WAIT(wait); | |
632 | prepare_to_wait(&state->wq, &wait, TASK_UNINTERRUPTIBLE); | |
cad321ad | 633 | spin_unlock(&tree->lock); |
d1310b2e | 634 | schedule(); |
cad321ad | 635 | spin_lock(&tree->lock); |
d1310b2e | 636 | finish_wait(&state->wq, &wait); |
d1310b2e CM |
637 | } |
638 | ||
639 | /* | |
640 | * waits for one or more bits to clear on a range in the state tree. | |
641 | * The range [start, end] is inclusive. | |
642 | * The tree lock is taken by this function | |
643 | */ | |
143bede5 | 644 | void wait_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, int bits) |
d1310b2e CM |
645 | { |
646 | struct extent_state *state; | |
647 | struct rb_node *node; | |
648 | ||
cad321ad | 649 | spin_lock(&tree->lock); |
d1310b2e CM |
650 | again: |
651 | while (1) { | |
652 | /* | |
653 | * this search will find all the extents that end after | |
654 | * our range starts | |
655 | */ | |
80ea96b1 | 656 | node = tree_search(tree, start); |
d1310b2e CM |
657 | if (!node) |
658 | break; | |
659 | ||
660 | state = rb_entry(node, struct extent_state, rb_node); | |
661 | ||
662 | if (state->start > end) | |
663 | goto out; | |
664 | ||
665 | if (state->state & bits) { | |
666 | start = state->start; | |
667 | atomic_inc(&state->refs); | |
668 | wait_on_state(tree, state); | |
669 | free_extent_state(state); | |
670 | goto again; | |
671 | } | |
672 | start = state->end + 1; | |
673 | ||
674 | if (start > end) | |
675 | break; | |
676 | ||
ded91f08 | 677 | cond_resched_lock(&tree->lock); |
d1310b2e CM |
678 | } |
679 | out: | |
cad321ad | 680 | spin_unlock(&tree->lock); |
d1310b2e | 681 | } |
d1310b2e | 682 | |
1bf85046 | 683 | static void set_state_bits(struct extent_io_tree *tree, |
d1310b2e | 684 | struct extent_state *state, |
0ca1f7ce | 685 | int *bits) |
d1310b2e | 686 | { |
0ca1f7ce | 687 | int bits_to_set = *bits & ~EXTENT_CTLBITS; |
9ed74f2d | 688 | |
1bf85046 | 689 | set_state_cb(tree, state, bits); |
0ca1f7ce | 690 | if ((bits_to_set & EXTENT_DIRTY) && !(state->state & EXTENT_DIRTY)) { |
d1310b2e CM |
691 | u64 range = state->end - state->start + 1; |
692 | tree->dirty_bytes += range; | |
693 | } | |
0ca1f7ce | 694 | state->state |= bits_to_set; |
d1310b2e CM |
695 | } |
696 | ||
2c64c53d CM |
697 | static void cache_state(struct extent_state *state, |
698 | struct extent_state **cached_ptr) | |
699 | { | |
700 | if (cached_ptr && !(*cached_ptr)) { | |
701 | if (state->state & (EXTENT_IOBITS | EXTENT_BOUNDARY)) { | |
702 | *cached_ptr = state; | |
703 | atomic_inc(&state->refs); | |
704 | } | |
705 | } | |
706 | } | |
707 | ||
507903b8 AJ |
708 | static void uncache_state(struct extent_state **cached_ptr) |
709 | { | |
710 | if (cached_ptr && (*cached_ptr)) { | |
711 | struct extent_state *state = *cached_ptr; | |
109b36a2 CM |
712 | *cached_ptr = NULL; |
713 | free_extent_state(state); | |
507903b8 AJ |
714 | } |
715 | } | |
716 | ||
d1310b2e | 717 | /* |
1edbb734 CM |
718 | * set some bits on a range in the tree. This may require allocations or |
719 | * sleeping, so the gfp mask is used to indicate what is allowed. | |
d1310b2e | 720 | * |
1edbb734 CM |
721 | * If any of the exclusive bits are set, this will fail with -EEXIST if some |
722 | * part of the range already has the desired bits set. The start of the | |
723 | * existing range is returned in failed_start in this case. | |
d1310b2e | 724 | * |
1edbb734 | 725 | * [start, end] is inclusive This takes the tree lock. |
d1310b2e | 726 | */ |
1edbb734 | 727 | |
3fbe5c02 JM |
728 | static int __must_check |
729 | __set_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, | |
730 | int bits, int exclusive_bits, u64 *failed_start, | |
731 | struct extent_state **cached_state, gfp_t mask) | |
d1310b2e CM |
732 | { |
733 | struct extent_state *state; | |
734 | struct extent_state *prealloc = NULL; | |
735 | struct rb_node *node; | |
d1310b2e | 736 | int err = 0; |
d1310b2e CM |
737 | u64 last_start; |
738 | u64 last_end; | |
42daec29 | 739 | |
0ca1f7ce | 740 | bits |= EXTENT_FIRST_DELALLOC; |
d1310b2e CM |
741 | again: |
742 | if (!prealloc && (mask & __GFP_WAIT)) { | |
743 | prealloc = alloc_extent_state(mask); | |
8233767a | 744 | BUG_ON(!prealloc); |
d1310b2e CM |
745 | } |
746 | ||
cad321ad | 747 | spin_lock(&tree->lock); |
9655d298 CM |
748 | if (cached_state && *cached_state) { |
749 | state = *cached_state; | |
df98b6e2 JB |
750 | if (state->start <= start && state->end > start && |
751 | state->tree) { | |
9655d298 CM |
752 | node = &state->rb_node; |
753 | goto hit_next; | |
754 | } | |
755 | } | |
d1310b2e CM |
756 | /* |
757 | * this search will find all the extents that end after | |
758 | * our range starts. | |
759 | */ | |
80ea96b1 | 760 | node = tree_search(tree, start); |
d1310b2e | 761 | if (!node) { |
8233767a XG |
762 | prealloc = alloc_extent_state_atomic(prealloc); |
763 | BUG_ON(!prealloc); | |
0ca1f7ce | 764 | err = insert_state(tree, prealloc, start, end, &bits); |
c2d904e0 JM |
765 | if (err) |
766 | extent_io_tree_panic(tree, err); | |
767 | ||
d1310b2e | 768 | prealloc = NULL; |
d1310b2e CM |
769 | goto out; |
770 | } | |
d1310b2e | 771 | state = rb_entry(node, struct extent_state, rb_node); |
40431d6c | 772 | hit_next: |
d1310b2e CM |
773 | last_start = state->start; |
774 | last_end = state->end; | |
775 | ||
776 | /* | |
777 | * | ---- desired range ---- | | |
778 | * | state | | |
779 | * | |
780 | * Just lock what we found and keep going | |
781 | */ | |
782 | if (state->start == start && state->end <= end) { | |
40431d6c | 783 | struct rb_node *next_node; |
1edbb734 | 784 | if (state->state & exclusive_bits) { |
d1310b2e CM |
785 | *failed_start = state->start; |
786 | err = -EEXIST; | |
787 | goto out; | |
788 | } | |
42daec29 | 789 | |
1bf85046 | 790 | set_state_bits(tree, state, &bits); |
9ed74f2d | 791 | |
2c64c53d | 792 | cache_state(state, cached_state); |
d1310b2e | 793 | merge_state(tree, state); |
5c939df5 YZ |
794 | if (last_end == (u64)-1) |
795 | goto out; | |
40431d6c | 796 | |
5c939df5 | 797 | start = last_end + 1; |
df98b6e2 | 798 | next_node = rb_next(&state->rb_node); |
c7f895a2 XG |
799 | if (next_node && start < end && prealloc && !need_resched()) { |
800 | state = rb_entry(next_node, struct extent_state, | |
801 | rb_node); | |
802 | if (state->start == start) | |
803 | goto hit_next; | |
40431d6c | 804 | } |
d1310b2e CM |
805 | goto search_again; |
806 | } | |
807 | ||
808 | /* | |
809 | * | ---- desired range ---- | | |
810 | * | state | | |
811 | * or | |
812 | * | ------------- state -------------- | | |
813 | * | |
814 | * We need to split the extent we found, and may flip bits on | |
815 | * second half. | |
816 | * | |
817 | * If the extent we found extends past our | |
818 | * range, we just split and search again. It'll get split | |
819 | * again the next time though. | |
820 | * | |
821 | * If the extent we found is inside our range, we set the | |
822 | * desired bit on it. | |
823 | */ | |
824 | if (state->start < start) { | |
1edbb734 | 825 | if (state->state & exclusive_bits) { |
d1310b2e CM |
826 | *failed_start = start; |
827 | err = -EEXIST; | |
828 | goto out; | |
829 | } | |
8233767a XG |
830 | |
831 | prealloc = alloc_extent_state_atomic(prealloc); | |
832 | BUG_ON(!prealloc); | |
d1310b2e | 833 | err = split_state(tree, state, prealloc, start); |
c2d904e0 JM |
834 | if (err) |
835 | extent_io_tree_panic(tree, err); | |
836 | ||
d1310b2e CM |
837 | prealloc = NULL; |
838 | if (err) | |
839 | goto out; | |
840 | if (state->end <= end) { | |
1bf85046 | 841 | set_state_bits(tree, state, &bits); |
2c64c53d | 842 | cache_state(state, cached_state); |
d1310b2e | 843 | merge_state(tree, state); |
5c939df5 YZ |
844 | if (last_end == (u64)-1) |
845 | goto out; | |
846 | start = last_end + 1; | |
d1310b2e CM |
847 | } |
848 | goto search_again; | |
849 | } | |
850 | /* | |
851 | * | ---- desired range ---- | | |
852 | * | state | or | state | | |
853 | * | |
854 | * There's a hole, we need to insert something in it and | |
855 | * ignore the extent we found. | |
856 | */ | |
857 | if (state->start > start) { | |
858 | u64 this_end; | |
859 | if (end < last_start) | |
860 | this_end = end; | |
861 | else | |
d397712b | 862 | this_end = last_start - 1; |
8233767a XG |
863 | |
864 | prealloc = alloc_extent_state_atomic(prealloc); | |
865 | BUG_ON(!prealloc); | |
c7f895a2 XG |
866 | |
867 | /* | |
868 | * Avoid to free 'prealloc' if it can be merged with | |
869 | * the later extent. | |
870 | */ | |
d1310b2e | 871 | err = insert_state(tree, prealloc, start, this_end, |
0ca1f7ce | 872 | &bits); |
c2d904e0 JM |
873 | if (err) |
874 | extent_io_tree_panic(tree, err); | |
875 | ||
9ed74f2d JB |
876 | cache_state(prealloc, cached_state); |
877 | prealloc = NULL; | |
d1310b2e CM |
878 | start = this_end + 1; |
879 | goto search_again; | |
880 | } | |
881 | /* | |
882 | * | ---- desired range ---- | | |
883 | * | state | | |
884 | * We need to split the extent, and set the bit | |
885 | * on the first half | |
886 | */ | |
887 | if (state->start <= end && state->end > end) { | |
1edbb734 | 888 | if (state->state & exclusive_bits) { |
d1310b2e CM |
889 | *failed_start = start; |
890 | err = -EEXIST; | |
891 | goto out; | |
892 | } | |
8233767a XG |
893 | |
894 | prealloc = alloc_extent_state_atomic(prealloc); | |
895 | BUG_ON(!prealloc); | |
d1310b2e | 896 | err = split_state(tree, state, prealloc, end + 1); |
c2d904e0 JM |
897 | if (err) |
898 | extent_io_tree_panic(tree, err); | |
d1310b2e | 899 | |
1bf85046 | 900 | set_state_bits(tree, prealloc, &bits); |
2c64c53d | 901 | cache_state(prealloc, cached_state); |
d1310b2e CM |
902 | merge_state(tree, prealloc); |
903 | prealloc = NULL; | |
904 | goto out; | |
905 | } | |
906 | ||
907 | goto search_again; | |
908 | ||
909 | out: | |
cad321ad | 910 | spin_unlock(&tree->lock); |
d1310b2e CM |
911 | if (prealloc) |
912 | free_extent_state(prealloc); | |
913 | ||
914 | return err; | |
915 | ||
916 | search_again: | |
917 | if (start > end) | |
918 | goto out; | |
cad321ad | 919 | spin_unlock(&tree->lock); |
d1310b2e CM |
920 | if (mask & __GFP_WAIT) |
921 | cond_resched(); | |
922 | goto again; | |
923 | } | |
d1310b2e | 924 | |
3fbe5c02 JM |
925 | int set_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, int bits, |
926 | u64 *failed_start, struct extent_state **cached_state, | |
927 | gfp_t mask) | |
928 | { | |
929 | return __set_extent_bit(tree, start, end, bits, 0, failed_start, | |
930 | cached_state, mask); | |
931 | } | |
932 | ||
933 | ||
462d6fac JB |
934 | /** |
935 | * convert_extent - convert all bits in a given range from one bit to another | |
936 | * @tree: the io tree to search | |
937 | * @start: the start offset in bytes | |
938 | * @end: the end offset in bytes (inclusive) | |
939 | * @bits: the bits to set in this range | |
940 | * @clear_bits: the bits to clear in this range | |
941 | * @mask: the allocation mask | |
942 | * | |
943 | * This will go through and set bits for the given range. If any states exist | |
944 | * already in this range they are set with the given bit and cleared of the | |
945 | * clear_bits. This is only meant to be used by things that are mergeable, ie | |
946 | * converting from say DELALLOC to DIRTY. This is not meant to be used with | |
947 | * boundary bits like LOCK. | |
948 | */ | |
949 | int convert_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, | |
950 | int bits, int clear_bits, gfp_t mask) | |
951 | { | |
952 | struct extent_state *state; | |
953 | struct extent_state *prealloc = NULL; | |
954 | struct rb_node *node; | |
955 | int err = 0; | |
956 | u64 last_start; | |
957 | u64 last_end; | |
958 | ||
959 | again: | |
960 | if (!prealloc && (mask & __GFP_WAIT)) { | |
961 | prealloc = alloc_extent_state(mask); | |
962 | if (!prealloc) | |
963 | return -ENOMEM; | |
964 | } | |
965 | ||
966 | spin_lock(&tree->lock); | |
967 | /* | |
968 | * this search will find all the extents that end after | |
969 | * our range starts. | |
970 | */ | |
971 | node = tree_search(tree, start); | |
972 | if (!node) { | |
973 | prealloc = alloc_extent_state_atomic(prealloc); | |
1cf4ffdb LB |
974 | if (!prealloc) { |
975 | err = -ENOMEM; | |
976 | goto out; | |
977 | } | |
462d6fac JB |
978 | err = insert_state(tree, prealloc, start, end, &bits); |
979 | prealloc = NULL; | |
c2d904e0 JM |
980 | if (err) |
981 | extent_io_tree_panic(tree, err); | |
462d6fac JB |
982 | goto out; |
983 | } | |
984 | state = rb_entry(node, struct extent_state, rb_node); | |
985 | hit_next: | |
986 | last_start = state->start; | |
987 | last_end = state->end; | |
988 | ||
989 | /* | |
990 | * | ---- desired range ---- | | |
991 | * | state | | |
992 | * | |
993 | * Just lock what we found and keep going | |
994 | */ | |
995 | if (state->start == start && state->end <= end) { | |
996 | struct rb_node *next_node; | |
997 | ||
998 | set_state_bits(tree, state, &bits); | |
999 | clear_state_bit(tree, state, &clear_bits, 0); | |
462d6fac JB |
1000 | if (last_end == (u64)-1) |
1001 | goto out; | |
1002 | ||
1003 | start = last_end + 1; | |
1004 | next_node = rb_next(&state->rb_node); | |
1005 | if (next_node && start < end && prealloc && !need_resched()) { | |
1006 | state = rb_entry(next_node, struct extent_state, | |
1007 | rb_node); | |
1008 | if (state->start == start) | |
1009 | goto hit_next; | |
1010 | } | |
1011 | goto search_again; | |
1012 | } | |
1013 | ||
1014 | /* | |
1015 | * | ---- desired range ---- | | |
1016 | * | state | | |
1017 | * or | |
1018 | * | ------------- state -------------- | | |
1019 | * | |
1020 | * We need to split the extent we found, and may flip bits on | |
1021 | * second half. | |
1022 | * | |
1023 | * If the extent we found extends past our | |
1024 | * range, we just split and search again. It'll get split | |
1025 | * again the next time though. | |
1026 | * | |
1027 | * If the extent we found is inside our range, we set the | |
1028 | * desired bit on it. | |
1029 | */ | |
1030 | if (state->start < start) { | |
1031 | prealloc = alloc_extent_state_atomic(prealloc); | |
1cf4ffdb LB |
1032 | if (!prealloc) { |
1033 | err = -ENOMEM; | |
1034 | goto out; | |
1035 | } | |
462d6fac | 1036 | err = split_state(tree, state, prealloc, start); |
c2d904e0 JM |
1037 | if (err) |
1038 | extent_io_tree_panic(tree, err); | |
462d6fac JB |
1039 | prealloc = NULL; |
1040 | if (err) | |
1041 | goto out; | |
1042 | if (state->end <= end) { | |
1043 | set_state_bits(tree, state, &bits); | |
1044 | clear_state_bit(tree, state, &clear_bits, 0); | |
462d6fac JB |
1045 | if (last_end == (u64)-1) |
1046 | goto out; | |
1047 | start = last_end + 1; | |
1048 | } | |
1049 | goto search_again; | |
1050 | } | |
1051 | /* | |
1052 | * | ---- desired range ---- | | |
1053 | * | state | or | state | | |
1054 | * | |
1055 | * There's a hole, we need to insert something in it and | |
1056 | * ignore the extent we found. | |
1057 | */ | |
1058 | if (state->start > start) { | |
1059 | u64 this_end; | |
1060 | if (end < last_start) | |
1061 | this_end = end; | |
1062 | else | |
1063 | this_end = last_start - 1; | |
1064 | ||
1065 | prealloc = alloc_extent_state_atomic(prealloc); | |
1cf4ffdb LB |
1066 | if (!prealloc) { |
1067 | err = -ENOMEM; | |
1068 | goto out; | |
1069 | } | |
462d6fac JB |
1070 | |
1071 | /* | |
1072 | * Avoid to free 'prealloc' if it can be merged with | |
1073 | * the later extent. | |
1074 | */ | |
1075 | err = insert_state(tree, prealloc, start, this_end, | |
1076 | &bits); | |
c2d904e0 JM |
1077 | if (err) |
1078 | extent_io_tree_panic(tree, err); | |
462d6fac JB |
1079 | prealloc = NULL; |
1080 | start = this_end + 1; | |
1081 | goto search_again; | |
1082 | } | |
1083 | /* | |
1084 | * | ---- desired range ---- | | |
1085 | * | state | | |
1086 | * We need to split the extent, and set the bit | |
1087 | * on the first half | |
1088 | */ | |
1089 | if (state->start <= end && state->end > end) { | |
1090 | prealloc = alloc_extent_state_atomic(prealloc); | |
1cf4ffdb LB |
1091 | if (!prealloc) { |
1092 | err = -ENOMEM; | |
1093 | goto out; | |
1094 | } | |
462d6fac JB |
1095 | |
1096 | err = split_state(tree, state, prealloc, end + 1); | |
c2d904e0 JM |
1097 | if (err) |
1098 | extent_io_tree_panic(tree, err); | |
462d6fac JB |
1099 | |
1100 | set_state_bits(tree, prealloc, &bits); | |
1101 | clear_state_bit(tree, prealloc, &clear_bits, 0); | |
462d6fac JB |
1102 | prealloc = NULL; |
1103 | goto out; | |
1104 | } | |
1105 | ||
1106 | goto search_again; | |
1107 | ||
1108 | out: | |
1109 | spin_unlock(&tree->lock); | |
1110 | if (prealloc) | |
1111 | free_extent_state(prealloc); | |
1112 | ||
1113 | return err; | |
1114 | ||
1115 | search_again: | |
1116 | if (start > end) | |
1117 | goto out; | |
1118 | spin_unlock(&tree->lock); | |
1119 | if (mask & __GFP_WAIT) | |
1120 | cond_resched(); | |
1121 | goto again; | |
1122 | } | |
1123 | ||
d1310b2e CM |
1124 | /* wrappers around set/clear extent bit */ |
1125 | int set_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end, | |
1126 | gfp_t mask) | |
1127 | { | |
3fbe5c02 | 1128 | return set_extent_bit(tree, start, end, EXTENT_DIRTY, NULL, |
2c64c53d | 1129 | NULL, mask); |
d1310b2e | 1130 | } |
d1310b2e CM |
1131 | |
1132 | int set_extent_bits(struct extent_io_tree *tree, u64 start, u64 end, | |
1133 | int bits, gfp_t mask) | |
1134 | { | |
3fbe5c02 | 1135 | return set_extent_bit(tree, start, end, bits, NULL, |
2c64c53d | 1136 | NULL, mask); |
d1310b2e | 1137 | } |
d1310b2e CM |
1138 | |
1139 | int clear_extent_bits(struct extent_io_tree *tree, u64 start, u64 end, | |
1140 | int bits, gfp_t mask) | |
1141 | { | |
2c64c53d | 1142 | return clear_extent_bit(tree, start, end, bits, 0, 0, NULL, mask); |
d1310b2e | 1143 | } |
d1310b2e CM |
1144 | |
1145 | int set_extent_delalloc(struct extent_io_tree *tree, u64 start, u64 end, | |
2ac55d41 | 1146 | struct extent_state **cached_state, gfp_t mask) |
d1310b2e CM |
1147 | { |
1148 | return set_extent_bit(tree, start, end, | |
fee187d9 | 1149 | EXTENT_DELALLOC | EXTENT_UPTODATE, |
3fbe5c02 | 1150 | NULL, cached_state, mask); |
d1310b2e | 1151 | } |
d1310b2e CM |
1152 | |
1153 | int clear_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end, | |
1154 | gfp_t mask) | |
1155 | { | |
1156 | return clear_extent_bit(tree, start, end, | |
32c00aff | 1157 | EXTENT_DIRTY | EXTENT_DELALLOC | |
0ca1f7ce | 1158 | EXTENT_DO_ACCOUNTING, 0, 0, NULL, mask); |
d1310b2e | 1159 | } |
d1310b2e CM |
1160 | |
1161 | int set_extent_new(struct extent_io_tree *tree, u64 start, u64 end, | |
1162 | gfp_t mask) | |
1163 | { | |
3fbe5c02 | 1164 | return set_extent_bit(tree, start, end, EXTENT_NEW, NULL, |
2c64c53d | 1165 | NULL, mask); |
d1310b2e | 1166 | } |
d1310b2e | 1167 | |
d1310b2e | 1168 | int set_extent_uptodate(struct extent_io_tree *tree, u64 start, u64 end, |
507903b8 | 1169 | struct extent_state **cached_state, gfp_t mask) |
d1310b2e | 1170 | { |
507903b8 | 1171 | return set_extent_bit(tree, start, end, EXTENT_UPTODATE, 0, |
3fbe5c02 | 1172 | cached_state, mask); |
d1310b2e | 1173 | } |
d1310b2e | 1174 | |
d397712b | 1175 | static int clear_extent_uptodate(struct extent_io_tree *tree, u64 start, |
2ac55d41 JB |
1176 | u64 end, struct extent_state **cached_state, |
1177 | gfp_t mask) | |
d1310b2e | 1178 | { |
2c64c53d | 1179 | return clear_extent_bit(tree, start, end, EXTENT_UPTODATE, 0, 0, |
2ac55d41 | 1180 | cached_state, mask); |
d1310b2e | 1181 | } |
d1310b2e | 1182 | |
d352ac68 CM |
1183 | /* |
1184 | * either insert or lock state struct between start and end use mask to tell | |
1185 | * us if waiting is desired. | |
1186 | */ | |
1edbb734 | 1187 | int lock_extent_bits(struct extent_io_tree *tree, u64 start, u64 end, |
d0082371 | 1188 | int bits, struct extent_state **cached_state) |
d1310b2e CM |
1189 | { |
1190 | int err; | |
1191 | u64 failed_start; | |
1192 | while (1) { | |
3fbe5c02 JM |
1193 | err = __set_extent_bit(tree, start, end, EXTENT_LOCKED | bits, |
1194 | EXTENT_LOCKED, &failed_start, | |
1195 | cached_state, GFP_NOFS); | |
d0082371 | 1196 | if (err == -EEXIST) { |
d1310b2e CM |
1197 | wait_extent_bit(tree, failed_start, end, EXTENT_LOCKED); |
1198 | start = failed_start; | |
d0082371 | 1199 | } else |
d1310b2e | 1200 | break; |
d1310b2e CM |
1201 | WARN_ON(start > end); |
1202 | } | |
1203 | return err; | |
1204 | } | |
d1310b2e | 1205 | |
d0082371 | 1206 | int lock_extent(struct extent_io_tree *tree, u64 start, u64 end) |
1edbb734 | 1207 | { |
d0082371 | 1208 | return lock_extent_bits(tree, start, end, 0, NULL); |
1edbb734 CM |
1209 | } |
1210 | ||
d0082371 | 1211 | int try_lock_extent(struct extent_io_tree *tree, u64 start, u64 end) |
25179201 JB |
1212 | { |
1213 | int err; | |
1214 | u64 failed_start; | |
1215 | ||
3fbe5c02 JM |
1216 | err = __set_extent_bit(tree, start, end, EXTENT_LOCKED, EXTENT_LOCKED, |
1217 | &failed_start, NULL, GFP_NOFS); | |
6643558d YZ |
1218 | if (err == -EEXIST) { |
1219 | if (failed_start > start) | |
1220 | clear_extent_bit(tree, start, failed_start - 1, | |
d0082371 | 1221 | EXTENT_LOCKED, 1, 0, NULL, GFP_NOFS); |
25179201 | 1222 | return 0; |
6643558d | 1223 | } |
25179201 JB |
1224 | return 1; |
1225 | } | |
25179201 | 1226 | |
2c64c53d CM |
1227 | int unlock_extent_cached(struct extent_io_tree *tree, u64 start, u64 end, |
1228 | struct extent_state **cached, gfp_t mask) | |
1229 | { | |
1230 | return clear_extent_bit(tree, start, end, EXTENT_LOCKED, 1, 0, cached, | |
1231 | mask); | |
1232 | } | |
1233 | ||
d0082371 | 1234 | int unlock_extent(struct extent_io_tree *tree, u64 start, u64 end) |
d1310b2e | 1235 | { |
2c64c53d | 1236 | return clear_extent_bit(tree, start, end, EXTENT_LOCKED, 1, 0, NULL, |
d0082371 | 1237 | GFP_NOFS); |
d1310b2e | 1238 | } |
d1310b2e | 1239 | |
d1310b2e CM |
1240 | /* |
1241 | * helper function to set both pages and extents in the tree writeback | |
1242 | */ | |
b2950863 | 1243 | static int set_range_writeback(struct extent_io_tree *tree, u64 start, u64 end) |
d1310b2e CM |
1244 | { |
1245 | unsigned long index = start >> PAGE_CACHE_SHIFT; | |
1246 | unsigned long end_index = end >> PAGE_CACHE_SHIFT; | |
1247 | struct page *page; | |
1248 | ||
1249 | while (index <= end_index) { | |
1250 | page = find_get_page(tree->mapping, index); | |
79787eaa | 1251 | BUG_ON(!page); /* Pages should be in the extent_io_tree */ |
d1310b2e CM |
1252 | set_page_writeback(page); |
1253 | page_cache_release(page); | |
1254 | index++; | |
1255 | } | |
d1310b2e CM |
1256 | return 0; |
1257 | } | |
d1310b2e | 1258 | |
d352ac68 CM |
1259 | /* find the first state struct with 'bits' set after 'start', and |
1260 | * return it. tree->lock must be held. NULL will returned if | |
1261 | * nothing was found after 'start' | |
1262 | */ | |
d7fc640e CM |
1263 | struct extent_state *find_first_extent_bit_state(struct extent_io_tree *tree, |
1264 | u64 start, int bits) | |
1265 | { | |
1266 | struct rb_node *node; | |
1267 | struct extent_state *state; | |
1268 | ||
1269 | /* | |
1270 | * this search will find all the extents that end after | |
1271 | * our range starts. | |
1272 | */ | |
1273 | node = tree_search(tree, start); | |
d397712b | 1274 | if (!node) |
d7fc640e | 1275 | goto out; |
d7fc640e | 1276 | |
d397712b | 1277 | while (1) { |
d7fc640e | 1278 | state = rb_entry(node, struct extent_state, rb_node); |
d397712b | 1279 | if (state->end >= start && (state->state & bits)) |
d7fc640e | 1280 | return state; |
d397712b | 1281 | |
d7fc640e CM |
1282 | node = rb_next(node); |
1283 | if (!node) | |
1284 | break; | |
1285 | } | |
1286 | out: | |
1287 | return NULL; | |
1288 | } | |
d7fc640e | 1289 | |
69261c4b XG |
1290 | /* |
1291 | * find the first offset in the io tree with 'bits' set. zero is | |
1292 | * returned if we find something, and *start_ret and *end_ret are | |
1293 | * set to reflect the state struct that was found. | |
1294 | * | |
477d7eaf | 1295 | * If nothing was found, 1 is returned. If found something, return 0. |
69261c4b XG |
1296 | */ |
1297 | int find_first_extent_bit(struct extent_io_tree *tree, u64 start, | |
1298 | u64 *start_ret, u64 *end_ret, int bits) | |
1299 | { | |
1300 | struct extent_state *state; | |
1301 | int ret = 1; | |
1302 | ||
1303 | spin_lock(&tree->lock); | |
1304 | state = find_first_extent_bit_state(tree, start, bits); | |
1305 | if (state) { | |
1306 | *start_ret = state->start; | |
1307 | *end_ret = state->end; | |
1308 | ret = 0; | |
1309 | } | |
1310 | spin_unlock(&tree->lock); | |
1311 | return ret; | |
1312 | } | |
1313 | ||
d352ac68 CM |
1314 | /* |
1315 | * find a contiguous range of bytes in the file marked as delalloc, not | |
1316 | * more than 'max_bytes'. start and end are used to return the range, | |
1317 | * | |
1318 | * 1 is returned if we find something, 0 if nothing was in the tree | |
1319 | */ | |
c8b97818 | 1320 | static noinline u64 find_delalloc_range(struct extent_io_tree *tree, |
c2a128d2 JB |
1321 | u64 *start, u64 *end, u64 max_bytes, |
1322 | struct extent_state **cached_state) | |
d1310b2e CM |
1323 | { |
1324 | struct rb_node *node; | |
1325 | struct extent_state *state; | |
1326 | u64 cur_start = *start; | |
1327 | u64 found = 0; | |
1328 | u64 total_bytes = 0; | |
1329 | ||
cad321ad | 1330 | spin_lock(&tree->lock); |
c8b97818 | 1331 | |
d1310b2e CM |
1332 | /* |
1333 | * this search will find all the extents that end after | |
1334 | * our range starts. | |
1335 | */ | |
80ea96b1 | 1336 | node = tree_search(tree, cur_start); |
2b114d1d | 1337 | if (!node) { |
3b951516 CM |
1338 | if (!found) |
1339 | *end = (u64)-1; | |
d1310b2e CM |
1340 | goto out; |
1341 | } | |
1342 | ||
d397712b | 1343 | while (1) { |
d1310b2e | 1344 | state = rb_entry(node, struct extent_state, rb_node); |
5b21f2ed ZY |
1345 | if (found && (state->start != cur_start || |
1346 | (state->state & EXTENT_BOUNDARY))) { | |
d1310b2e CM |
1347 | goto out; |
1348 | } | |
1349 | if (!(state->state & EXTENT_DELALLOC)) { | |
1350 | if (!found) | |
1351 | *end = state->end; | |
1352 | goto out; | |
1353 | } | |
c2a128d2 | 1354 | if (!found) { |
d1310b2e | 1355 | *start = state->start; |
c2a128d2 JB |
1356 | *cached_state = state; |
1357 | atomic_inc(&state->refs); | |
1358 | } | |
d1310b2e CM |
1359 | found++; |
1360 | *end = state->end; | |
1361 | cur_start = state->end + 1; | |
1362 | node = rb_next(node); | |
1363 | if (!node) | |
1364 | break; | |
1365 | total_bytes += state->end - state->start + 1; | |
1366 | if (total_bytes >= max_bytes) | |
1367 | break; | |
1368 | } | |
1369 | out: | |
cad321ad | 1370 | spin_unlock(&tree->lock); |
d1310b2e CM |
1371 | return found; |
1372 | } | |
1373 | ||
143bede5 JM |
1374 | static noinline void __unlock_for_delalloc(struct inode *inode, |
1375 | struct page *locked_page, | |
1376 | u64 start, u64 end) | |
c8b97818 CM |
1377 | { |
1378 | int ret; | |
1379 | struct page *pages[16]; | |
1380 | unsigned long index = start >> PAGE_CACHE_SHIFT; | |
1381 | unsigned long end_index = end >> PAGE_CACHE_SHIFT; | |
1382 | unsigned long nr_pages = end_index - index + 1; | |
1383 | int i; | |
1384 | ||
1385 | if (index == locked_page->index && end_index == index) | |
143bede5 | 1386 | return; |
c8b97818 | 1387 | |
d397712b | 1388 | while (nr_pages > 0) { |
c8b97818 | 1389 | ret = find_get_pages_contig(inode->i_mapping, index, |
5b050f04 CM |
1390 | min_t(unsigned long, nr_pages, |
1391 | ARRAY_SIZE(pages)), pages); | |
c8b97818 CM |
1392 | for (i = 0; i < ret; i++) { |
1393 | if (pages[i] != locked_page) | |
1394 | unlock_page(pages[i]); | |
1395 | page_cache_release(pages[i]); | |
1396 | } | |
1397 | nr_pages -= ret; | |
1398 | index += ret; | |
1399 | cond_resched(); | |
1400 | } | |
c8b97818 CM |
1401 | } |
1402 | ||
1403 | static noinline int lock_delalloc_pages(struct inode *inode, | |
1404 | struct page *locked_page, | |
1405 | u64 delalloc_start, | |
1406 | u64 delalloc_end) | |
1407 | { | |
1408 | unsigned long index = delalloc_start >> PAGE_CACHE_SHIFT; | |
1409 | unsigned long start_index = index; | |
1410 | unsigned long end_index = delalloc_end >> PAGE_CACHE_SHIFT; | |
1411 | unsigned long pages_locked = 0; | |
1412 | struct page *pages[16]; | |
1413 | unsigned long nrpages; | |
1414 | int ret; | |
1415 | int i; | |
1416 | ||
1417 | /* the caller is responsible for locking the start index */ | |
1418 | if (index == locked_page->index && index == end_index) | |
1419 | return 0; | |
1420 | ||
1421 | /* skip the page at the start index */ | |
1422 | nrpages = end_index - index + 1; | |
d397712b | 1423 | while (nrpages > 0) { |
c8b97818 | 1424 | ret = find_get_pages_contig(inode->i_mapping, index, |
5b050f04 CM |
1425 | min_t(unsigned long, |
1426 | nrpages, ARRAY_SIZE(pages)), pages); | |
c8b97818 CM |
1427 | if (ret == 0) { |
1428 | ret = -EAGAIN; | |
1429 | goto done; | |
1430 | } | |
1431 | /* now we have an array of pages, lock them all */ | |
1432 | for (i = 0; i < ret; i++) { | |
1433 | /* | |
1434 | * the caller is taking responsibility for | |
1435 | * locked_page | |
1436 | */ | |
771ed689 | 1437 | if (pages[i] != locked_page) { |
c8b97818 | 1438 | lock_page(pages[i]); |
f2b1c41c CM |
1439 | if (!PageDirty(pages[i]) || |
1440 | pages[i]->mapping != inode->i_mapping) { | |
771ed689 CM |
1441 | ret = -EAGAIN; |
1442 | unlock_page(pages[i]); | |
1443 | page_cache_release(pages[i]); | |
1444 | goto done; | |
1445 | } | |
1446 | } | |
c8b97818 | 1447 | page_cache_release(pages[i]); |
771ed689 | 1448 | pages_locked++; |
c8b97818 | 1449 | } |
c8b97818 CM |
1450 | nrpages -= ret; |
1451 | index += ret; | |
1452 | cond_resched(); | |
1453 | } | |
1454 | ret = 0; | |
1455 | done: | |
1456 | if (ret && pages_locked) { | |
1457 | __unlock_for_delalloc(inode, locked_page, | |
1458 | delalloc_start, | |
1459 | ((u64)(start_index + pages_locked - 1)) << | |
1460 | PAGE_CACHE_SHIFT); | |
1461 | } | |
1462 | return ret; | |
1463 | } | |
1464 | ||
1465 | /* | |
1466 | * find a contiguous range of bytes in the file marked as delalloc, not | |
1467 | * more than 'max_bytes'. start and end are used to return the range, | |
1468 | * | |
1469 | * 1 is returned if we find something, 0 if nothing was in the tree | |
1470 | */ | |
1471 | static noinline u64 find_lock_delalloc_range(struct inode *inode, | |
1472 | struct extent_io_tree *tree, | |
1473 | struct page *locked_page, | |
1474 | u64 *start, u64 *end, | |
1475 | u64 max_bytes) | |
1476 | { | |
1477 | u64 delalloc_start; | |
1478 | u64 delalloc_end; | |
1479 | u64 found; | |
9655d298 | 1480 | struct extent_state *cached_state = NULL; |
c8b97818 CM |
1481 | int ret; |
1482 | int loops = 0; | |
1483 | ||
1484 | again: | |
1485 | /* step one, find a bunch of delalloc bytes starting at start */ | |
1486 | delalloc_start = *start; | |
1487 | delalloc_end = 0; | |
1488 | found = find_delalloc_range(tree, &delalloc_start, &delalloc_end, | |
c2a128d2 | 1489 | max_bytes, &cached_state); |
70b99e69 | 1490 | if (!found || delalloc_end <= *start) { |
c8b97818 CM |
1491 | *start = delalloc_start; |
1492 | *end = delalloc_end; | |
c2a128d2 | 1493 | free_extent_state(cached_state); |
c8b97818 CM |
1494 | return found; |
1495 | } | |
1496 | ||
70b99e69 CM |
1497 | /* |
1498 | * start comes from the offset of locked_page. We have to lock | |
1499 | * pages in order, so we can't process delalloc bytes before | |
1500 | * locked_page | |
1501 | */ | |
d397712b | 1502 | if (delalloc_start < *start) |
70b99e69 | 1503 | delalloc_start = *start; |
70b99e69 | 1504 | |
c8b97818 CM |
1505 | /* |
1506 | * make sure to limit the number of pages we try to lock down | |
1507 | * if we're looping. | |
1508 | */ | |
d397712b | 1509 | if (delalloc_end + 1 - delalloc_start > max_bytes && loops) |
771ed689 | 1510 | delalloc_end = delalloc_start + PAGE_CACHE_SIZE - 1; |
d397712b | 1511 | |
c8b97818 CM |
1512 | /* step two, lock all the pages after the page that has start */ |
1513 | ret = lock_delalloc_pages(inode, locked_page, | |
1514 | delalloc_start, delalloc_end); | |
1515 | if (ret == -EAGAIN) { | |
1516 | /* some of the pages are gone, lets avoid looping by | |
1517 | * shortening the size of the delalloc range we're searching | |
1518 | */ | |
9655d298 | 1519 | free_extent_state(cached_state); |
c8b97818 CM |
1520 | if (!loops) { |
1521 | unsigned long offset = (*start) & (PAGE_CACHE_SIZE - 1); | |
1522 | max_bytes = PAGE_CACHE_SIZE - offset; | |
1523 | loops = 1; | |
1524 | goto again; | |
1525 | } else { | |
1526 | found = 0; | |
1527 | goto out_failed; | |
1528 | } | |
1529 | } | |
79787eaa | 1530 | BUG_ON(ret); /* Only valid values are 0 and -EAGAIN */ |
c8b97818 CM |
1531 | |
1532 | /* step three, lock the state bits for the whole range */ | |
d0082371 | 1533 | lock_extent_bits(tree, delalloc_start, delalloc_end, 0, &cached_state); |
c8b97818 CM |
1534 | |
1535 | /* then test to make sure it is all still delalloc */ | |
1536 | ret = test_range_bit(tree, delalloc_start, delalloc_end, | |
9655d298 | 1537 | EXTENT_DELALLOC, 1, cached_state); |
c8b97818 | 1538 | if (!ret) { |
9655d298 CM |
1539 | unlock_extent_cached(tree, delalloc_start, delalloc_end, |
1540 | &cached_state, GFP_NOFS); | |
c8b97818 CM |
1541 | __unlock_for_delalloc(inode, locked_page, |
1542 | delalloc_start, delalloc_end); | |
1543 | cond_resched(); | |
1544 | goto again; | |
1545 | } | |
9655d298 | 1546 | free_extent_state(cached_state); |
c8b97818 CM |
1547 | *start = delalloc_start; |
1548 | *end = delalloc_end; | |
1549 | out_failed: | |
1550 | return found; | |
1551 | } | |
1552 | ||
1553 | int extent_clear_unlock_delalloc(struct inode *inode, | |
1554 | struct extent_io_tree *tree, | |
1555 | u64 start, u64 end, struct page *locked_page, | |
a791e35e | 1556 | unsigned long op) |
c8b97818 CM |
1557 | { |
1558 | int ret; | |
1559 | struct page *pages[16]; | |
1560 | unsigned long index = start >> PAGE_CACHE_SHIFT; | |
1561 | unsigned long end_index = end >> PAGE_CACHE_SHIFT; | |
1562 | unsigned long nr_pages = end_index - index + 1; | |
1563 | int i; | |
771ed689 | 1564 | int clear_bits = 0; |
c8b97818 | 1565 | |
a791e35e | 1566 | if (op & EXTENT_CLEAR_UNLOCK) |
771ed689 | 1567 | clear_bits |= EXTENT_LOCKED; |
a791e35e | 1568 | if (op & EXTENT_CLEAR_DIRTY) |
c8b97818 CM |
1569 | clear_bits |= EXTENT_DIRTY; |
1570 | ||
a791e35e | 1571 | if (op & EXTENT_CLEAR_DELALLOC) |
771ed689 CM |
1572 | clear_bits |= EXTENT_DELALLOC; |
1573 | ||
2c64c53d | 1574 | clear_extent_bit(tree, start, end, clear_bits, 1, 0, NULL, GFP_NOFS); |
32c00aff JB |
1575 | if (!(op & (EXTENT_CLEAR_UNLOCK_PAGE | EXTENT_CLEAR_DIRTY | |
1576 | EXTENT_SET_WRITEBACK | EXTENT_END_WRITEBACK | | |
1577 | EXTENT_SET_PRIVATE2))) | |
771ed689 | 1578 | return 0; |
c8b97818 | 1579 | |
d397712b | 1580 | while (nr_pages > 0) { |
c8b97818 | 1581 | ret = find_get_pages_contig(inode->i_mapping, index, |
5b050f04 CM |
1582 | min_t(unsigned long, |
1583 | nr_pages, ARRAY_SIZE(pages)), pages); | |
c8b97818 | 1584 | for (i = 0; i < ret; i++) { |
8b62b72b | 1585 | |
a791e35e | 1586 | if (op & EXTENT_SET_PRIVATE2) |
8b62b72b CM |
1587 | SetPagePrivate2(pages[i]); |
1588 | ||
c8b97818 CM |
1589 | if (pages[i] == locked_page) { |
1590 | page_cache_release(pages[i]); | |
1591 | continue; | |
1592 | } | |
a791e35e | 1593 | if (op & EXTENT_CLEAR_DIRTY) |
c8b97818 | 1594 | clear_page_dirty_for_io(pages[i]); |
a791e35e | 1595 | if (op & EXTENT_SET_WRITEBACK) |
c8b97818 | 1596 | set_page_writeback(pages[i]); |
a791e35e | 1597 | if (op & EXTENT_END_WRITEBACK) |
c8b97818 | 1598 | end_page_writeback(pages[i]); |
a791e35e | 1599 | if (op & EXTENT_CLEAR_UNLOCK_PAGE) |
771ed689 | 1600 | unlock_page(pages[i]); |
c8b97818 CM |
1601 | page_cache_release(pages[i]); |
1602 | } | |
1603 | nr_pages -= ret; | |
1604 | index += ret; | |
1605 | cond_resched(); | |
1606 | } | |
1607 | return 0; | |
1608 | } | |
c8b97818 | 1609 | |
d352ac68 CM |
1610 | /* |
1611 | * count the number of bytes in the tree that have a given bit(s) | |
1612 | * set. This can be fairly slow, except for EXTENT_DIRTY which is | |
1613 | * cached. The total number found is returned. | |
1614 | */ | |
d1310b2e CM |
1615 | u64 count_range_bits(struct extent_io_tree *tree, |
1616 | u64 *start, u64 search_end, u64 max_bytes, | |
ec29ed5b | 1617 | unsigned long bits, int contig) |
d1310b2e CM |
1618 | { |
1619 | struct rb_node *node; | |
1620 | struct extent_state *state; | |
1621 | u64 cur_start = *start; | |
1622 | u64 total_bytes = 0; | |
ec29ed5b | 1623 | u64 last = 0; |
d1310b2e CM |
1624 | int found = 0; |
1625 | ||
1626 | if (search_end <= cur_start) { | |
d1310b2e CM |
1627 | WARN_ON(1); |
1628 | return 0; | |
1629 | } | |
1630 | ||
cad321ad | 1631 | spin_lock(&tree->lock); |
d1310b2e CM |
1632 | if (cur_start == 0 && bits == EXTENT_DIRTY) { |
1633 | total_bytes = tree->dirty_bytes; | |
1634 | goto out; | |
1635 | } | |
1636 | /* | |
1637 | * this search will find all the extents that end after | |
1638 | * our range starts. | |
1639 | */ | |
80ea96b1 | 1640 | node = tree_search(tree, cur_start); |
d397712b | 1641 | if (!node) |
d1310b2e | 1642 | goto out; |
d1310b2e | 1643 | |
d397712b | 1644 | while (1) { |
d1310b2e CM |
1645 | state = rb_entry(node, struct extent_state, rb_node); |
1646 | if (state->start > search_end) | |
1647 | break; | |
ec29ed5b CM |
1648 | if (contig && found && state->start > last + 1) |
1649 | break; | |
1650 | if (state->end >= cur_start && (state->state & bits) == bits) { | |
d1310b2e CM |
1651 | total_bytes += min(search_end, state->end) + 1 - |
1652 | max(cur_start, state->start); | |
1653 | if (total_bytes >= max_bytes) | |
1654 | break; | |
1655 | if (!found) { | |
af60bed2 | 1656 | *start = max(cur_start, state->start); |
d1310b2e CM |
1657 | found = 1; |
1658 | } | |
ec29ed5b CM |
1659 | last = state->end; |
1660 | } else if (contig && found) { | |
1661 | break; | |
d1310b2e CM |
1662 | } |
1663 | node = rb_next(node); | |
1664 | if (!node) | |
1665 | break; | |
1666 | } | |
1667 | out: | |
cad321ad | 1668 | spin_unlock(&tree->lock); |
d1310b2e CM |
1669 | return total_bytes; |
1670 | } | |
b2950863 | 1671 | |
d352ac68 CM |
1672 | /* |
1673 | * set the private field for a given byte offset in the tree. If there isn't | |
1674 | * an extent_state there already, this does nothing. | |
1675 | */ | |
d1310b2e CM |
1676 | int set_state_private(struct extent_io_tree *tree, u64 start, u64 private) |
1677 | { | |
1678 | struct rb_node *node; | |
1679 | struct extent_state *state; | |
1680 | int ret = 0; | |
1681 | ||
cad321ad | 1682 | spin_lock(&tree->lock); |
d1310b2e CM |
1683 | /* |
1684 | * this search will find all the extents that end after | |
1685 | * our range starts. | |
1686 | */ | |
80ea96b1 | 1687 | node = tree_search(tree, start); |
2b114d1d | 1688 | if (!node) { |
d1310b2e CM |
1689 | ret = -ENOENT; |
1690 | goto out; | |
1691 | } | |
1692 | state = rb_entry(node, struct extent_state, rb_node); | |
1693 | if (state->start != start) { | |
1694 | ret = -ENOENT; | |
1695 | goto out; | |
1696 | } | |
1697 | state->private = private; | |
1698 | out: | |
cad321ad | 1699 | spin_unlock(&tree->lock); |
d1310b2e CM |
1700 | return ret; |
1701 | } | |
1702 | ||
1703 | int get_state_private(struct extent_io_tree *tree, u64 start, u64 *private) | |
1704 | { | |
1705 | struct rb_node *node; | |
1706 | struct extent_state *state; | |
1707 | int ret = 0; | |
1708 | ||
cad321ad | 1709 | spin_lock(&tree->lock); |
d1310b2e CM |
1710 | /* |
1711 | * this search will find all the extents that end after | |
1712 | * our range starts. | |
1713 | */ | |
80ea96b1 | 1714 | node = tree_search(tree, start); |
2b114d1d | 1715 | if (!node) { |
d1310b2e CM |
1716 | ret = -ENOENT; |
1717 | goto out; | |
1718 | } | |
1719 | state = rb_entry(node, struct extent_state, rb_node); | |
1720 | if (state->start != start) { | |
1721 | ret = -ENOENT; | |
1722 | goto out; | |
1723 | } | |
1724 | *private = state->private; | |
1725 | out: | |
cad321ad | 1726 | spin_unlock(&tree->lock); |
d1310b2e CM |
1727 | return ret; |
1728 | } | |
1729 | ||
1730 | /* | |
1731 | * searches a range in the state tree for a given mask. | |
70dec807 | 1732 | * If 'filled' == 1, this returns 1 only if every extent in the tree |
d1310b2e CM |
1733 | * has the bits set. Otherwise, 1 is returned if any bit in the |
1734 | * range is found set. | |
1735 | */ | |
1736 | int test_range_bit(struct extent_io_tree *tree, u64 start, u64 end, | |
9655d298 | 1737 | int bits, int filled, struct extent_state *cached) |
d1310b2e CM |
1738 | { |
1739 | struct extent_state *state = NULL; | |
1740 | struct rb_node *node; | |
1741 | int bitset = 0; | |
d1310b2e | 1742 | |
cad321ad | 1743 | spin_lock(&tree->lock); |
df98b6e2 JB |
1744 | if (cached && cached->tree && cached->start <= start && |
1745 | cached->end > start) | |
9655d298 CM |
1746 | node = &cached->rb_node; |
1747 | else | |
1748 | node = tree_search(tree, start); | |
d1310b2e CM |
1749 | while (node && start <= end) { |
1750 | state = rb_entry(node, struct extent_state, rb_node); | |
1751 | ||
1752 | if (filled && state->start > start) { | |
1753 | bitset = 0; | |
1754 | break; | |
1755 | } | |
1756 | ||
1757 | if (state->start > end) | |
1758 | break; | |
1759 | ||
1760 | if (state->state & bits) { | |
1761 | bitset = 1; | |
1762 | if (!filled) | |
1763 | break; | |
1764 | } else if (filled) { | |
1765 | bitset = 0; | |
1766 | break; | |
1767 | } | |
46562cec CM |
1768 | |
1769 | if (state->end == (u64)-1) | |
1770 | break; | |
1771 | ||
d1310b2e CM |
1772 | start = state->end + 1; |
1773 | if (start > end) | |
1774 | break; | |
1775 | node = rb_next(node); | |
1776 | if (!node) { | |
1777 | if (filled) | |
1778 | bitset = 0; | |
1779 | break; | |
1780 | } | |
1781 | } | |
cad321ad | 1782 | spin_unlock(&tree->lock); |
d1310b2e CM |
1783 | return bitset; |
1784 | } | |
d1310b2e CM |
1785 | |
1786 | /* | |
1787 | * helper function to set a given page up to date if all the | |
1788 | * extents in the tree for that page are up to date | |
1789 | */ | |
143bede5 | 1790 | static void check_page_uptodate(struct extent_io_tree *tree, struct page *page) |
d1310b2e CM |
1791 | { |
1792 | u64 start = (u64)page->index << PAGE_CACHE_SHIFT; | |
1793 | u64 end = start + PAGE_CACHE_SIZE - 1; | |
9655d298 | 1794 | if (test_range_bit(tree, start, end, EXTENT_UPTODATE, 1, NULL)) |
d1310b2e | 1795 | SetPageUptodate(page); |
d1310b2e CM |
1796 | } |
1797 | ||
1798 | /* | |
1799 | * helper function to unlock a page if all the extents in the tree | |
1800 | * for that page are unlocked | |
1801 | */ | |
143bede5 | 1802 | static void check_page_locked(struct extent_io_tree *tree, struct page *page) |
d1310b2e CM |
1803 | { |
1804 | u64 start = (u64)page->index << PAGE_CACHE_SHIFT; | |
1805 | u64 end = start + PAGE_CACHE_SIZE - 1; | |
9655d298 | 1806 | if (!test_range_bit(tree, start, end, EXTENT_LOCKED, 0, NULL)) |
d1310b2e | 1807 | unlock_page(page); |
d1310b2e CM |
1808 | } |
1809 | ||
1810 | /* | |
1811 | * helper function to end page writeback if all the extents | |
1812 | * in the tree for that page are done with writeback | |
1813 | */ | |
143bede5 JM |
1814 | static void check_page_writeback(struct extent_io_tree *tree, |
1815 | struct page *page) | |
d1310b2e | 1816 | { |
1edbb734 | 1817 | end_page_writeback(page); |
d1310b2e CM |
1818 | } |
1819 | ||
4a54c8c1 JS |
1820 | /* |
1821 | * When IO fails, either with EIO or csum verification fails, we | |
1822 | * try other mirrors that might have a good copy of the data. This | |
1823 | * io_failure_record is used to record state as we go through all the | |
1824 | * mirrors. If another mirror has good data, the page is set up to date | |
1825 | * and things continue. If a good mirror can't be found, the original | |
1826 | * bio end_io callback is called to indicate things have failed. | |
1827 | */ | |
1828 | struct io_failure_record { | |
1829 | struct page *page; | |
1830 | u64 start; | |
1831 | u64 len; | |
1832 | u64 logical; | |
1833 | unsigned long bio_flags; | |
1834 | int this_mirror; | |
1835 | int failed_mirror; | |
1836 | int in_validation; | |
1837 | }; | |
1838 | ||
1839 | static int free_io_failure(struct inode *inode, struct io_failure_record *rec, | |
1840 | int did_repair) | |
1841 | { | |
1842 | int ret; | |
1843 | int err = 0; | |
1844 | struct extent_io_tree *failure_tree = &BTRFS_I(inode)->io_failure_tree; | |
1845 | ||
1846 | set_state_private(failure_tree, rec->start, 0); | |
1847 | ret = clear_extent_bits(failure_tree, rec->start, | |
1848 | rec->start + rec->len - 1, | |
1849 | EXTENT_LOCKED | EXTENT_DIRTY, GFP_NOFS); | |
1850 | if (ret) | |
1851 | err = ret; | |
1852 | ||
1853 | if (did_repair) { | |
1854 | ret = clear_extent_bits(&BTRFS_I(inode)->io_tree, rec->start, | |
1855 | rec->start + rec->len - 1, | |
1856 | EXTENT_DAMAGED, GFP_NOFS); | |
1857 | if (ret && !err) | |
1858 | err = ret; | |
1859 | } | |
1860 | ||
1861 | kfree(rec); | |
1862 | return err; | |
1863 | } | |
1864 | ||
1865 | static void repair_io_failure_callback(struct bio *bio, int err) | |
1866 | { | |
1867 | complete(bio->bi_private); | |
1868 | } | |
1869 | ||
1870 | /* | |
1871 | * this bypasses the standard btrfs submit functions deliberately, as | |
1872 | * the standard behavior is to write all copies in a raid setup. here we only | |
1873 | * want to write the one bad copy. so we do the mapping for ourselves and issue | |
1874 | * submit_bio directly. | |
1875 | * to avoid any synchonization issues, wait for the data after writing, which | |
1876 | * actually prevents the read that triggered the error from finishing. | |
1877 | * currently, there can be no more than two copies of every data bit. thus, | |
1878 | * exactly one rewrite is required. | |
1879 | */ | |
1880 | int repair_io_failure(struct btrfs_mapping_tree *map_tree, u64 start, | |
1881 | u64 length, u64 logical, struct page *page, | |
1882 | int mirror_num) | |
1883 | { | |
1884 | struct bio *bio; | |
1885 | struct btrfs_device *dev; | |
1886 | DECLARE_COMPLETION_ONSTACK(compl); | |
1887 | u64 map_length = 0; | |
1888 | u64 sector; | |
1889 | struct btrfs_bio *bbio = NULL; | |
1890 | int ret; | |
1891 | ||
1892 | BUG_ON(!mirror_num); | |
1893 | ||
1894 | bio = bio_alloc(GFP_NOFS, 1); | |
1895 | if (!bio) | |
1896 | return -EIO; | |
1897 | bio->bi_private = &compl; | |
1898 | bio->bi_end_io = repair_io_failure_callback; | |
1899 | bio->bi_size = 0; | |
1900 | map_length = length; | |
1901 | ||
1902 | ret = btrfs_map_block(map_tree, WRITE, logical, | |
1903 | &map_length, &bbio, mirror_num); | |
1904 | if (ret) { | |
1905 | bio_put(bio); | |
1906 | return -EIO; | |
1907 | } | |
1908 | BUG_ON(mirror_num != bbio->mirror_num); | |
1909 | sector = bbio->stripes[mirror_num-1].physical >> 9; | |
1910 | bio->bi_sector = sector; | |
1911 | dev = bbio->stripes[mirror_num-1].dev; | |
1912 | kfree(bbio); | |
1913 | if (!dev || !dev->bdev || !dev->writeable) { | |
1914 | bio_put(bio); | |
1915 | return -EIO; | |
1916 | } | |
1917 | bio->bi_bdev = dev->bdev; | |
1918 | bio_add_page(bio, page, length, start-page_offset(page)); | |
21adbd5c | 1919 | btrfsic_submit_bio(WRITE_SYNC, bio); |
4a54c8c1 JS |
1920 | wait_for_completion(&compl); |
1921 | ||
1922 | if (!test_bit(BIO_UPTODATE, &bio->bi_flags)) { | |
1923 | /* try to remap that extent elsewhere? */ | |
1924 | bio_put(bio); | |
1925 | return -EIO; | |
1926 | } | |
1927 | ||
1928 | printk(KERN_INFO "btrfs read error corrected: ino %lu off %llu (dev %s " | |
1929 | "sector %llu)\n", page->mapping->host->i_ino, start, | |
1930 | dev->name, sector); | |
1931 | ||
1932 | bio_put(bio); | |
1933 | return 0; | |
1934 | } | |
1935 | ||
ea466794 JB |
1936 | int repair_eb_io_failure(struct btrfs_root *root, struct extent_buffer *eb, |
1937 | int mirror_num) | |
1938 | { | |
1939 | struct btrfs_mapping_tree *map_tree = &root->fs_info->mapping_tree; | |
1940 | u64 start = eb->start; | |
1941 | unsigned long i, num_pages = num_extent_pages(eb->start, eb->len); | |
d95603b2 | 1942 | int ret = 0; |
ea466794 JB |
1943 | |
1944 | for (i = 0; i < num_pages; i++) { | |
1945 | struct page *p = extent_buffer_page(eb, i); | |
1946 | ret = repair_io_failure(map_tree, start, PAGE_CACHE_SIZE, | |
1947 | start, p, mirror_num); | |
1948 | if (ret) | |
1949 | break; | |
1950 | start += PAGE_CACHE_SIZE; | |
1951 | } | |
1952 | ||
1953 | return ret; | |
1954 | } | |
1955 | ||
4a54c8c1 JS |
1956 | /* |
1957 | * each time an IO finishes, we do a fast check in the IO failure tree | |
1958 | * to see if we need to process or clean up an io_failure_record | |
1959 | */ | |
1960 | static int clean_io_failure(u64 start, struct page *page) | |
1961 | { | |
1962 | u64 private; | |
1963 | u64 private_failure; | |
1964 | struct io_failure_record *failrec; | |
1965 | struct btrfs_mapping_tree *map_tree; | |
1966 | struct extent_state *state; | |
1967 | int num_copies; | |
1968 | int did_repair = 0; | |
1969 | int ret; | |
1970 | struct inode *inode = page->mapping->host; | |
1971 | ||
1972 | private = 0; | |
1973 | ret = count_range_bits(&BTRFS_I(inode)->io_failure_tree, &private, | |
1974 | (u64)-1, 1, EXTENT_DIRTY, 0); | |
1975 | if (!ret) | |
1976 | return 0; | |
1977 | ||
1978 | ret = get_state_private(&BTRFS_I(inode)->io_failure_tree, start, | |
1979 | &private_failure); | |
1980 | if (ret) | |
1981 | return 0; | |
1982 | ||
1983 | failrec = (struct io_failure_record *)(unsigned long) private_failure; | |
1984 | BUG_ON(!failrec->this_mirror); | |
1985 | ||
1986 | if (failrec->in_validation) { | |
1987 | /* there was no real error, just free the record */ | |
1988 | pr_debug("clean_io_failure: freeing dummy error at %llu\n", | |
1989 | failrec->start); | |
1990 | did_repair = 1; | |
1991 | goto out; | |
1992 | } | |
1993 | ||
1994 | spin_lock(&BTRFS_I(inode)->io_tree.lock); | |
1995 | state = find_first_extent_bit_state(&BTRFS_I(inode)->io_tree, | |
1996 | failrec->start, | |
1997 | EXTENT_LOCKED); | |
1998 | spin_unlock(&BTRFS_I(inode)->io_tree.lock); | |
1999 | ||
2000 | if (state && state->start == failrec->start) { | |
2001 | map_tree = &BTRFS_I(inode)->root->fs_info->mapping_tree; | |
2002 | num_copies = btrfs_num_copies(map_tree, failrec->logical, | |
2003 | failrec->len); | |
2004 | if (num_copies > 1) { | |
2005 | ret = repair_io_failure(map_tree, start, failrec->len, | |
2006 | failrec->logical, page, | |
2007 | failrec->failed_mirror); | |
2008 | did_repair = !ret; | |
2009 | } | |
2010 | } | |
2011 | ||
2012 | out: | |
2013 | if (!ret) | |
2014 | ret = free_io_failure(inode, failrec, did_repair); | |
2015 | ||
2016 | return ret; | |
2017 | } | |
2018 | ||
2019 | /* | |
2020 | * this is a generic handler for readpage errors (default | |
2021 | * readpage_io_failed_hook). if other copies exist, read those and write back | |
2022 | * good data to the failed position. does not investigate in remapping the | |
2023 | * failed extent elsewhere, hoping the device will be smart enough to do this as | |
2024 | * needed | |
2025 | */ | |
2026 | ||
2027 | static int bio_readpage_error(struct bio *failed_bio, struct page *page, | |
2028 | u64 start, u64 end, int failed_mirror, | |
2029 | struct extent_state *state) | |
2030 | { | |
2031 | struct io_failure_record *failrec = NULL; | |
2032 | u64 private; | |
2033 | struct extent_map *em; | |
2034 | struct inode *inode = page->mapping->host; | |
2035 | struct extent_io_tree *failure_tree = &BTRFS_I(inode)->io_failure_tree; | |
2036 | struct extent_io_tree *tree = &BTRFS_I(inode)->io_tree; | |
2037 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; | |
2038 | struct bio *bio; | |
2039 | int num_copies; | |
2040 | int ret; | |
2041 | int read_mode; | |
2042 | u64 logical; | |
2043 | ||
2044 | BUG_ON(failed_bio->bi_rw & REQ_WRITE); | |
2045 | ||
2046 | ret = get_state_private(failure_tree, start, &private); | |
2047 | if (ret) { | |
2048 | failrec = kzalloc(sizeof(*failrec), GFP_NOFS); | |
2049 | if (!failrec) | |
2050 | return -ENOMEM; | |
2051 | failrec->start = start; | |
2052 | failrec->len = end - start + 1; | |
2053 | failrec->this_mirror = 0; | |
2054 | failrec->bio_flags = 0; | |
2055 | failrec->in_validation = 0; | |
2056 | ||
2057 | read_lock(&em_tree->lock); | |
2058 | em = lookup_extent_mapping(em_tree, start, failrec->len); | |
2059 | if (!em) { | |
2060 | read_unlock(&em_tree->lock); | |
2061 | kfree(failrec); | |
2062 | return -EIO; | |
2063 | } | |
2064 | ||
2065 | if (em->start > start || em->start + em->len < start) { | |
2066 | free_extent_map(em); | |
2067 | em = NULL; | |
2068 | } | |
2069 | read_unlock(&em_tree->lock); | |
2070 | ||
2071 | if (!em || IS_ERR(em)) { | |
2072 | kfree(failrec); | |
2073 | return -EIO; | |
2074 | } | |
2075 | logical = start - em->start; | |
2076 | logical = em->block_start + logical; | |
2077 | if (test_bit(EXTENT_FLAG_COMPRESSED, &em->flags)) { | |
2078 | logical = em->block_start; | |
2079 | failrec->bio_flags = EXTENT_BIO_COMPRESSED; | |
2080 | extent_set_compress_type(&failrec->bio_flags, | |
2081 | em->compress_type); | |
2082 | } | |
2083 | pr_debug("bio_readpage_error: (new) logical=%llu, start=%llu, " | |
2084 | "len=%llu\n", logical, start, failrec->len); | |
2085 | failrec->logical = logical; | |
2086 | free_extent_map(em); | |
2087 | ||
2088 | /* set the bits in the private failure tree */ | |
2089 | ret = set_extent_bits(failure_tree, start, end, | |
2090 | EXTENT_LOCKED | EXTENT_DIRTY, GFP_NOFS); | |
2091 | if (ret >= 0) | |
2092 | ret = set_state_private(failure_tree, start, | |
2093 | (u64)(unsigned long)failrec); | |
2094 | /* set the bits in the inode's tree */ | |
2095 | if (ret >= 0) | |
2096 | ret = set_extent_bits(tree, start, end, EXTENT_DAMAGED, | |
2097 | GFP_NOFS); | |
2098 | if (ret < 0) { | |
2099 | kfree(failrec); | |
2100 | return ret; | |
2101 | } | |
2102 | } else { | |
2103 | failrec = (struct io_failure_record *)(unsigned long)private; | |
2104 | pr_debug("bio_readpage_error: (found) logical=%llu, " | |
2105 | "start=%llu, len=%llu, validation=%d\n", | |
2106 | failrec->logical, failrec->start, failrec->len, | |
2107 | failrec->in_validation); | |
2108 | /* | |
2109 | * when data can be on disk more than twice, add to failrec here | |
2110 | * (e.g. with a list for failed_mirror) to make | |
2111 | * clean_io_failure() clean all those errors at once. | |
2112 | */ | |
2113 | } | |
2114 | num_copies = btrfs_num_copies( | |
2115 | &BTRFS_I(inode)->root->fs_info->mapping_tree, | |
2116 | failrec->logical, failrec->len); | |
2117 | if (num_copies == 1) { | |
2118 | /* | |
2119 | * we only have a single copy of the data, so don't bother with | |
2120 | * all the retry and error correction code that follows. no | |
2121 | * matter what the error is, it is very likely to persist. | |
2122 | */ | |
2123 | pr_debug("bio_readpage_error: cannot repair, num_copies == 1. " | |
2124 | "state=%p, num_copies=%d, next_mirror %d, " | |
2125 | "failed_mirror %d\n", state, num_copies, | |
2126 | failrec->this_mirror, failed_mirror); | |
2127 | free_io_failure(inode, failrec, 0); | |
2128 | return -EIO; | |
2129 | } | |
2130 | ||
2131 | if (!state) { | |
2132 | spin_lock(&tree->lock); | |
2133 | state = find_first_extent_bit_state(tree, failrec->start, | |
2134 | EXTENT_LOCKED); | |
2135 | if (state && state->start != failrec->start) | |
2136 | state = NULL; | |
2137 | spin_unlock(&tree->lock); | |
2138 | } | |
2139 | ||
2140 | /* | |
2141 | * there are two premises: | |
2142 | * a) deliver good data to the caller | |
2143 | * b) correct the bad sectors on disk | |
2144 | */ | |
2145 | if (failed_bio->bi_vcnt > 1) { | |
2146 | /* | |
2147 | * to fulfill b), we need to know the exact failing sectors, as | |
2148 | * we don't want to rewrite any more than the failed ones. thus, | |
2149 | * we need separate read requests for the failed bio | |
2150 | * | |
2151 | * if the following BUG_ON triggers, our validation request got | |
2152 | * merged. we need separate requests for our algorithm to work. | |
2153 | */ | |
2154 | BUG_ON(failrec->in_validation); | |
2155 | failrec->in_validation = 1; | |
2156 | failrec->this_mirror = failed_mirror; | |
2157 | read_mode = READ_SYNC | REQ_FAILFAST_DEV; | |
2158 | } else { | |
2159 | /* | |
2160 | * we're ready to fulfill a) and b) alongside. get a good copy | |
2161 | * of the failed sector and if we succeed, we have setup | |
2162 | * everything for repair_io_failure to do the rest for us. | |
2163 | */ | |
2164 | if (failrec->in_validation) { | |
2165 | BUG_ON(failrec->this_mirror != failed_mirror); | |
2166 | failrec->in_validation = 0; | |
2167 | failrec->this_mirror = 0; | |
2168 | } | |
2169 | failrec->failed_mirror = failed_mirror; | |
2170 | failrec->this_mirror++; | |
2171 | if (failrec->this_mirror == failed_mirror) | |
2172 | failrec->this_mirror++; | |
2173 | read_mode = READ_SYNC; | |
2174 | } | |
2175 | ||
2176 | if (!state || failrec->this_mirror > num_copies) { | |
2177 | pr_debug("bio_readpage_error: (fail) state=%p, num_copies=%d, " | |
2178 | "next_mirror %d, failed_mirror %d\n", state, | |
2179 | num_copies, failrec->this_mirror, failed_mirror); | |
2180 | free_io_failure(inode, failrec, 0); | |
2181 | return -EIO; | |
2182 | } | |
2183 | ||
2184 | bio = bio_alloc(GFP_NOFS, 1); | |
e627ee7b TI |
2185 | if (!bio) { |
2186 | free_io_failure(inode, failrec, 0); | |
2187 | return -EIO; | |
2188 | } | |
4a54c8c1 JS |
2189 | bio->bi_private = state; |
2190 | bio->bi_end_io = failed_bio->bi_end_io; | |
2191 | bio->bi_sector = failrec->logical >> 9; | |
2192 | bio->bi_bdev = BTRFS_I(inode)->root->fs_info->fs_devices->latest_bdev; | |
2193 | bio->bi_size = 0; | |
2194 | ||
2195 | bio_add_page(bio, page, failrec->len, start - page_offset(page)); | |
2196 | ||
2197 | pr_debug("bio_readpage_error: submitting new read[%#x] to " | |
2198 | "this_mirror=%d, num_copies=%d, in_validation=%d\n", read_mode, | |
2199 | failrec->this_mirror, num_copies, failrec->in_validation); | |
2200 | ||
013bd4c3 TI |
2201 | ret = tree->ops->submit_bio_hook(inode, read_mode, bio, |
2202 | failrec->this_mirror, | |
2203 | failrec->bio_flags, 0); | |
2204 | return ret; | |
4a54c8c1 JS |
2205 | } |
2206 | ||
d1310b2e CM |
2207 | /* lots and lots of room for performance fixes in the end_bio funcs */ |
2208 | ||
87826df0 JM |
2209 | int end_extent_writepage(struct page *page, int err, u64 start, u64 end) |
2210 | { | |
2211 | int uptodate = (err == 0); | |
2212 | struct extent_io_tree *tree; | |
2213 | int ret; | |
2214 | ||
2215 | tree = &BTRFS_I(page->mapping->host)->io_tree; | |
2216 | ||
2217 | if (tree->ops && tree->ops->writepage_end_io_hook) { | |
2218 | ret = tree->ops->writepage_end_io_hook(page, start, | |
2219 | end, NULL, uptodate); | |
2220 | if (ret) | |
2221 | uptodate = 0; | |
2222 | } | |
2223 | ||
2224 | if (!uptodate && tree->ops && | |
2225 | tree->ops->writepage_io_failed_hook) { | |
2226 | ret = tree->ops->writepage_io_failed_hook(NULL, page, | |
2227 | start, end, NULL); | |
2228 | /* Writeback already completed */ | |
2229 | if (ret == 0) | |
2230 | return 1; | |
2231 | } | |
2232 | ||
2233 | if (!uptodate) { | |
2234 | clear_extent_uptodate(tree, start, end, NULL, GFP_NOFS); | |
2235 | ClearPageUptodate(page); | |
2236 | SetPageError(page); | |
2237 | } | |
2238 | return 0; | |
2239 | } | |
2240 | ||
d1310b2e CM |
2241 | /* |
2242 | * after a writepage IO is done, we need to: | |
2243 | * clear the uptodate bits on error | |
2244 | * clear the writeback bits in the extent tree for this IO | |
2245 | * end_page_writeback if the page has no more pending IO | |
2246 | * | |
2247 | * Scheduling is not allowed, so the extent state tree is expected | |
2248 | * to have one and only one object corresponding to this IO. | |
2249 | */ | |
d1310b2e | 2250 | static void end_bio_extent_writepage(struct bio *bio, int err) |
d1310b2e | 2251 | { |
d1310b2e | 2252 | struct bio_vec *bvec = bio->bi_io_vec + bio->bi_vcnt - 1; |
902b22f3 | 2253 | struct extent_io_tree *tree; |
d1310b2e CM |
2254 | u64 start; |
2255 | u64 end; | |
2256 | int whole_page; | |
2257 | ||
d1310b2e CM |
2258 | do { |
2259 | struct page *page = bvec->bv_page; | |
902b22f3 DW |
2260 | tree = &BTRFS_I(page->mapping->host)->io_tree; |
2261 | ||
d1310b2e CM |
2262 | start = ((u64)page->index << PAGE_CACHE_SHIFT) + |
2263 | bvec->bv_offset; | |
2264 | end = start + bvec->bv_len - 1; | |
2265 | ||
2266 | if (bvec->bv_offset == 0 && bvec->bv_len == PAGE_CACHE_SIZE) | |
2267 | whole_page = 1; | |
2268 | else | |
2269 | whole_page = 0; | |
2270 | ||
2271 | if (--bvec >= bio->bi_io_vec) | |
2272 | prefetchw(&bvec->bv_page->flags); | |
1259ab75 | 2273 | |
87826df0 JM |
2274 | if (end_extent_writepage(page, err, start, end)) |
2275 | continue; | |
70dec807 | 2276 | |
d1310b2e CM |
2277 | if (whole_page) |
2278 | end_page_writeback(page); | |
2279 | else | |
2280 | check_page_writeback(tree, page); | |
d1310b2e | 2281 | } while (bvec >= bio->bi_io_vec); |
2b1f55b0 | 2282 | |
d1310b2e | 2283 | bio_put(bio); |
d1310b2e CM |
2284 | } |
2285 | ||
2286 | /* | |
2287 | * after a readpage IO is done, we need to: | |
2288 | * clear the uptodate bits on error | |
2289 | * set the uptodate bits if things worked | |
2290 | * set the page up to date if all extents in the tree are uptodate | |
2291 | * clear the lock bit in the extent tree | |
2292 | * unlock the page if there are no other extents locked for it | |
2293 | * | |
2294 | * Scheduling is not allowed, so the extent state tree is expected | |
2295 | * to have one and only one object corresponding to this IO. | |
2296 | */ | |
d1310b2e | 2297 | static void end_bio_extent_readpage(struct bio *bio, int err) |
d1310b2e CM |
2298 | { |
2299 | int uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags); | |
4125bf76 CM |
2300 | struct bio_vec *bvec_end = bio->bi_io_vec + bio->bi_vcnt - 1; |
2301 | struct bio_vec *bvec = bio->bi_io_vec; | |
902b22f3 | 2302 | struct extent_io_tree *tree; |
d1310b2e CM |
2303 | u64 start; |
2304 | u64 end; | |
2305 | int whole_page; | |
5cf1ab56 | 2306 | int mirror; |
d1310b2e CM |
2307 | int ret; |
2308 | ||
d20f7043 CM |
2309 | if (err) |
2310 | uptodate = 0; | |
2311 | ||
d1310b2e CM |
2312 | do { |
2313 | struct page *page = bvec->bv_page; | |
507903b8 AJ |
2314 | struct extent_state *cached = NULL; |
2315 | struct extent_state *state; | |
2316 | ||
4a54c8c1 JS |
2317 | pr_debug("end_bio_extent_readpage: bi_vcnt=%d, idx=%d, err=%d, " |
2318 | "mirror=%ld\n", bio->bi_vcnt, bio->bi_idx, err, | |
2319 | (long int)bio->bi_bdev); | |
902b22f3 DW |
2320 | tree = &BTRFS_I(page->mapping->host)->io_tree; |
2321 | ||
d1310b2e CM |
2322 | start = ((u64)page->index << PAGE_CACHE_SHIFT) + |
2323 | bvec->bv_offset; | |
2324 | end = start + bvec->bv_len - 1; | |
2325 | ||
2326 | if (bvec->bv_offset == 0 && bvec->bv_len == PAGE_CACHE_SIZE) | |
2327 | whole_page = 1; | |
2328 | else | |
2329 | whole_page = 0; | |
2330 | ||
4125bf76 | 2331 | if (++bvec <= bvec_end) |
d1310b2e CM |
2332 | prefetchw(&bvec->bv_page->flags); |
2333 | ||
507903b8 | 2334 | spin_lock(&tree->lock); |
0d399205 | 2335 | state = find_first_extent_bit_state(tree, start, EXTENT_LOCKED); |
109b36a2 | 2336 | if (state && state->start == start) { |
507903b8 AJ |
2337 | /* |
2338 | * take a reference on the state, unlock will drop | |
2339 | * the ref | |
2340 | */ | |
2341 | cache_state(state, &cached); | |
2342 | } | |
2343 | spin_unlock(&tree->lock); | |
2344 | ||
5cf1ab56 | 2345 | mirror = (int)(unsigned long)bio->bi_bdev; |
d1310b2e | 2346 | if (uptodate && tree->ops && tree->ops->readpage_end_io_hook) { |
70dec807 | 2347 | ret = tree->ops->readpage_end_io_hook(page, start, end, |
5cf1ab56 | 2348 | state, mirror); |
d1310b2e CM |
2349 | if (ret) |
2350 | uptodate = 0; | |
4a54c8c1 JS |
2351 | else |
2352 | clean_io_failure(start, page); | |
d1310b2e | 2353 | } |
ea466794 | 2354 | |
ea466794 | 2355 | if (!uptodate && tree->ops && tree->ops->readpage_io_failed_hook) { |
5cf1ab56 | 2356 | ret = tree->ops->readpage_io_failed_hook(page, mirror); |
ea466794 JB |
2357 | if (!ret && !err && |
2358 | test_bit(BIO_UPTODATE, &bio->bi_flags)) | |
2359 | uptodate = 1; | |
2360 | } else if (!uptodate) { | |
f4a8e656 JS |
2361 | /* |
2362 | * The generic bio_readpage_error handles errors the | |
2363 | * following way: If possible, new read requests are | |
2364 | * created and submitted and will end up in | |
2365 | * end_bio_extent_readpage as well (if we're lucky, not | |
2366 | * in the !uptodate case). In that case it returns 0 and | |
2367 | * we just go on with the next page in our bio. If it | |
2368 | * can't handle the error it will return -EIO and we | |
2369 | * remain responsible for that page. | |
2370 | */ | |
5cf1ab56 | 2371 | ret = bio_readpage_error(bio, page, start, end, mirror, NULL); |
7e38326f | 2372 | if (ret == 0) { |
3b951516 CM |
2373 | uptodate = |
2374 | test_bit(BIO_UPTODATE, &bio->bi_flags); | |
d20f7043 CM |
2375 | if (err) |
2376 | uptodate = 0; | |
507903b8 | 2377 | uncache_state(&cached); |
7e38326f CM |
2378 | continue; |
2379 | } | |
2380 | } | |
d1310b2e | 2381 | |
0b32f4bb | 2382 | if (uptodate && tree->track_uptodate) { |
507903b8 | 2383 | set_extent_uptodate(tree, start, end, &cached, |
902b22f3 | 2384 | GFP_ATOMIC); |
771ed689 | 2385 | } |
507903b8 | 2386 | unlock_extent_cached(tree, start, end, &cached, GFP_ATOMIC); |
d1310b2e | 2387 | |
70dec807 CM |
2388 | if (whole_page) { |
2389 | if (uptodate) { | |
2390 | SetPageUptodate(page); | |
2391 | } else { | |
2392 | ClearPageUptodate(page); | |
2393 | SetPageError(page); | |
2394 | } | |
d1310b2e | 2395 | unlock_page(page); |
70dec807 CM |
2396 | } else { |
2397 | if (uptodate) { | |
2398 | check_page_uptodate(tree, page); | |
2399 | } else { | |
2400 | ClearPageUptodate(page); | |
2401 | SetPageError(page); | |
2402 | } | |
d1310b2e | 2403 | check_page_locked(tree, page); |
70dec807 | 2404 | } |
4125bf76 | 2405 | } while (bvec <= bvec_end); |
d1310b2e CM |
2406 | |
2407 | bio_put(bio); | |
d1310b2e CM |
2408 | } |
2409 | ||
88f794ed MX |
2410 | struct bio * |
2411 | btrfs_bio_alloc(struct block_device *bdev, u64 first_sector, int nr_vecs, | |
2412 | gfp_t gfp_flags) | |
d1310b2e CM |
2413 | { |
2414 | struct bio *bio; | |
2415 | ||
2416 | bio = bio_alloc(gfp_flags, nr_vecs); | |
2417 | ||
2418 | if (bio == NULL && (current->flags & PF_MEMALLOC)) { | |
2419 | while (!bio && (nr_vecs /= 2)) | |
2420 | bio = bio_alloc(gfp_flags, nr_vecs); | |
2421 | } | |
2422 | ||
2423 | if (bio) { | |
e1c4b745 | 2424 | bio->bi_size = 0; |
d1310b2e CM |
2425 | bio->bi_bdev = bdev; |
2426 | bio->bi_sector = first_sector; | |
2427 | } | |
2428 | return bio; | |
2429 | } | |
2430 | ||
79787eaa JM |
2431 | /* |
2432 | * Since writes are async, they will only return -ENOMEM. | |
2433 | * Reads can return the full range of I/O error conditions. | |
2434 | */ | |
355808c2 JM |
2435 | static int __must_check submit_one_bio(int rw, struct bio *bio, |
2436 | int mirror_num, unsigned long bio_flags) | |
d1310b2e | 2437 | { |
d1310b2e | 2438 | int ret = 0; |
70dec807 CM |
2439 | struct bio_vec *bvec = bio->bi_io_vec + bio->bi_vcnt - 1; |
2440 | struct page *page = bvec->bv_page; | |
2441 | struct extent_io_tree *tree = bio->bi_private; | |
70dec807 | 2442 | u64 start; |
70dec807 CM |
2443 | |
2444 | start = ((u64)page->index << PAGE_CACHE_SHIFT) + bvec->bv_offset; | |
70dec807 | 2445 | |
902b22f3 | 2446 | bio->bi_private = NULL; |
d1310b2e CM |
2447 | |
2448 | bio_get(bio); | |
2449 | ||
065631f6 | 2450 | if (tree->ops && tree->ops->submit_bio_hook) |
6b82ce8d | 2451 | ret = tree->ops->submit_bio_hook(page->mapping->host, rw, bio, |
eaf25d93 | 2452 | mirror_num, bio_flags, start); |
0b86a832 | 2453 | else |
21adbd5c | 2454 | btrfsic_submit_bio(rw, bio); |
4a54c8c1 | 2455 | |
d1310b2e CM |
2456 | if (bio_flagged(bio, BIO_EOPNOTSUPP)) |
2457 | ret = -EOPNOTSUPP; | |
2458 | bio_put(bio); | |
2459 | return ret; | |
2460 | } | |
2461 | ||
3444a972 JM |
2462 | static int merge_bio(struct extent_io_tree *tree, struct page *page, |
2463 | unsigned long offset, size_t size, struct bio *bio, | |
2464 | unsigned long bio_flags) | |
2465 | { | |
2466 | int ret = 0; | |
2467 | if (tree->ops && tree->ops->merge_bio_hook) | |
2468 | ret = tree->ops->merge_bio_hook(page, offset, size, bio, | |
2469 | bio_flags); | |
2470 | BUG_ON(ret < 0); | |
2471 | return ret; | |
2472 | ||
2473 | } | |
2474 | ||
d1310b2e CM |
2475 | static int submit_extent_page(int rw, struct extent_io_tree *tree, |
2476 | struct page *page, sector_t sector, | |
2477 | size_t size, unsigned long offset, | |
2478 | struct block_device *bdev, | |
2479 | struct bio **bio_ret, | |
2480 | unsigned long max_pages, | |
f188591e | 2481 | bio_end_io_t end_io_func, |
c8b97818 CM |
2482 | int mirror_num, |
2483 | unsigned long prev_bio_flags, | |
2484 | unsigned long bio_flags) | |
d1310b2e CM |
2485 | { |
2486 | int ret = 0; | |
2487 | struct bio *bio; | |
2488 | int nr; | |
c8b97818 CM |
2489 | int contig = 0; |
2490 | int this_compressed = bio_flags & EXTENT_BIO_COMPRESSED; | |
2491 | int old_compressed = prev_bio_flags & EXTENT_BIO_COMPRESSED; | |
5b050f04 | 2492 | size_t page_size = min_t(size_t, size, PAGE_CACHE_SIZE); |
d1310b2e CM |
2493 | |
2494 | if (bio_ret && *bio_ret) { | |
2495 | bio = *bio_ret; | |
c8b97818 CM |
2496 | if (old_compressed) |
2497 | contig = bio->bi_sector == sector; | |
2498 | else | |
2499 | contig = bio->bi_sector + (bio->bi_size >> 9) == | |
2500 | sector; | |
2501 | ||
2502 | if (prev_bio_flags != bio_flags || !contig || | |
3444a972 | 2503 | merge_bio(tree, page, offset, page_size, bio, bio_flags) || |
c8b97818 CM |
2504 | bio_add_page(bio, page, page_size, offset) < page_size) { |
2505 | ret = submit_one_bio(rw, bio, mirror_num, | |
2506 | prev_bio_flags); | |
79787eaa JM |
2507 | if (ret < 0) |
2508 | return ret; | |
d1310b2e CM |
2509 | bio = NULL; |
2510 | } else { | |
2511 | return 0; | |
2512 | } | |
2513 | } | |
c8b97818 CM |
2514 | if (this_compressed) |
2515 | nr = BIO_MAX_PAGES; | |
2516 | else | |
2517 | nr = bio_get_nr_vecs(bdev); | |
2518 | ||
88f794ed | 2519 | bio = btrfs_bio_alloc(bdev, sector, nr, GFP_NOFS | __GFP_HIGH); |
5df67083 TI |
2520 | if (!bio) |
2521 | return -ENOMEM; | |
70dec807 | 2522 | |
c8b97818 | 2523 | bio_add_page(bio, page, page_size, offset); |
d1310b2e CM |
2524 | bio->bi_end_io = end_io_func; |
2525 | bio->bi_private = tree; | |
70dec807 | 2526 | |
d397712b | 2527 | if (bio_ret) |
d1310b2e | 2528 | *bio_ret = bio; |
d397712b | 2529 | else |
c8b97818 | 2530 | ret = submit_one_bio(rw, bio, mirror_num, bio_flags); |
d1310b2e CM |
2531 | |
2532 | return ret; | |
2533 | } | |
2534 | ||
4f2de97a | 2535 | void attach_extent_buffer_page(struct extent_buffer *eb, struct page *page) |
d1310b2e CM |
2536 | { |
2537 | if (!PagePrivate(page)) { | |
2538 | SetPagePrivate(page); | |
d1310b2e | 2539 | page_cache_get(page); |
4f2de97a JB |
2540 | set_page_private(page, (unsigned long)eb); |
2541 | } else { | |
2542 | WARN_ON(page->private != (unsigned long)eb); | |
d1310b2e CM |
2543 | } |
2544 | } | |
2545 | ||
4f2de97a | 2546 | void set_page_extent_mapped(struct page *page) |
d1310b2e | 2547 | { |
4f2de97a JB |
2548 | if (!PagePrivate(page)) { |
2549 | SetPagePrivate(page); | |
2550 | page_cache_get(page); | |
2551 | set_page_private(page, EXTENT_PAGE_PRIVATE); | |
2552 | } | |
d1310b2e CM |
2553 | } |
2554 | ||
2555 | /* | |
2556 | * basic readpage implementation. Locked extent state structs are inserted | |
2557 | * into the tree that are removed when the IO is done (by the end_io | |
2558 | * handlers) | |
79787eaa | 2559 | * XXX JDM: This needs looking at to ensure proper page locking |
d1310b2e CM |
2560 | */ |
2561 | static int __extent_read_full_page(struct extent_io_tree *tree, | |
2562 | struct page *page, | |
2563 | get_extent_t *get_extent, | |
c8b97818 CM |
2564 | struct bio **bio, int mirror_num, |
2565 | unsigned long *bio_flags) | |
d1310b2e CM |
2566 | { |
2567 | struct inode *inode = page->mapping->host; | |
2568 | u64 start = (u64)page->index << PAGE_CACHE_SHIFT; | |
2569 | u64 page_end = start + PAGE_CACHE_SIZE - 1; | |
2570 | u64 end; | |
2571 | u64 cur = start; | |
2572 | u64 extent_offset; | |
2573 | u64 last_byte = i_size_read(inode); | |
2574 | u64 block_start; | |
2575 | u64 cur_end; | |
2576 | sector_t sector; | |
2577 | struct extent_map *em; | |
2578 | struct block_device *bdev; | |
11c65dcc | 2579 | struct btrfs_ordered_extent *ordered; |
d1310b2e CM |
2580 | int ret; |
2581 | int nr = 0; | |
306e16ce | 2582 | size_t pg_offset = 0; |
d1310b2e | 2583 | size_t iosize; |
c8b97818 | 2584 | size_t disk_io_size; |
d1310b2e | 2585 | size_t blocksize = inode->i_sb->s_blocksize; |
c8b97818 | 2586 | unsigned long this_bio_flag = 0; |
d1310b2e CM |
2587 | |
2588 | set_page_extent_mapped(page); | |
2589 | ||
90a887c9 DM |
2590 | if (!PageUptodate(page)) { |
2591 | if (cleancache_get_page(page) == 0) { | |
2592 | BUG_ON(blocksize != PAGE_SIZE); | |
2593 | goto out; | |
2594 | } | |
2595 | } | |
2596 | ||
d1310b2e | 2597 | end = page_end; |
11c65dcc | 2598 | while (1) { |
d0082371 | 2599 | lock_extent(tree, start, end); |
11c65dcc JB |
2600 | ordered = btrfs_lookup_ordered_extent(inode, start); |
2601 | if (!ordered) | |
2602 | break; | |
d0082371 | 2603 | unlock_extent(tree, start, end); |
11c65dcc JB |
2604 | btrfs_start_ordered_extent(inode, ordered, 1); |
2605 | btrfs_put_ordered_extent(ordered); | |
2606 | } | |
d1310b2e | 2607 | |
c8b97818 CM |
2608 | if (page->index == last_byte >> PAGE_CACHE_SHIFT) { |
2609 | char *userpage; | |
2610 | size_t zero_offset = last_byte & (PAGE_CACHE_SIZE - 1); | |
2611 | ||
2612 | if (zero_offset) { | |
2613 | iosize = PAGE_CACHE_SIZE - zero_offset; | |
7ac687d9 | 2614 | userpage = kmap_atomic(page); |
c8b97818 CM |
2615 | memset(userpage + zero_offset, 0, iosize); |
2616 | flush_dcache_page(page); | |
7ac687d9 | 2617 | kunmap_atomic(userpage); |
c8b97818 CM |
2618 | } |
2619 | } | |
d1310b2e CM |
2620 | while (cur <= end) { |
2621 | if (cur >= last_byte) { | |
2622 | char *userpage; | |
507903b8 AJ |
2623 | struct extent_state *cached = NULL; |
2624 | ||
306e16ce | 2625 | iosize = PAGE_CACHE_SIZE - pg_offset; |
7ac687d9 | 2626 | userpage = kmap_atomic(page); |
306e16ce | 2627 | memset(userpage + pg_offset, 0, iosize); |
d1310b2e | 2628 | flush_dcache_page(page); |
7ac687d9 | 2629 | kunmap_atomic(userpage); |
d1310b2e | 2630 | set_extent_uptodate(tree, cur, cur + iosize - 1, |
507903b8 AJ |
2631 | &cached, GFP_NOFS); |
2632 | unlock_extent_cached(tree, cur, cur + iosize - 1, | |
2633 | &cached, GFP_NOFS); | |
d1310b2e CM |
2634 | break; |
2635 | } | |
306e16ce | 2636 | em = get_extent(inode, page, pg_offset, cur, |
d1310b2e | 2637 | end - cur + 1, 0); |
c704005d | 2638 | if (IS_ERR_OR_NULL(em)) { |
d1310b2e | 2639 | SetPageError(page); |
d0082371 | 2640 | unlock_extent(tree, cur, end); |
d1310b2e CM |
2641 | break; |
2642 | } | |
d1310b2e CM |
2643 | extent_offset = cur - em->start; |
2644 | BUG_ON(extent_map_end(em) <= cur); | |
2645 | BUG_ON(end < cur); | |
2646 | ||
261507a0 | 2647 | if (test_bit(EXTENT_FLAG_COMPRESSED, &em->flags)) { |
c8b97818 | 2648 | this_bio_flag = EXTENT_BIO_COMPRESSED; |
261507a0 LZ |
2649 | extent_set_compress_type(&this_bio_flag, |
2650 | em->compress_type); | |
2651 | } | |
c8b97818 | 2652 | |
d1310b2e CM |
2653 | iosize = min(extent_map_end(em) - cur, end - cur + 1); |
2654 | cur_end = min(extent_map_end(em) - 1, end); | |
2655 | iosize = (iosize + blocksize - 1) & ~((u64)blocksize - 1); | |
c8b97818 CM |
2656 | if (this_bio_flag & EXTENT_BIO_COMPRESSED) { |
2657 | disk_io_size = em->block_len; | |
2658 | sector = em->block_start >> 9; | |
2659 | } else { | |
2660 | sector = (em->block_start + extent_offset) >> 9; | |
2661 | disk_io_size = iosize; | |
2662 | } | |
d1310b2e CM |
2663 | bdev = em->bdev; |
2664 | block_start = em->block_start; | |
d899e052 YZ |
2665 | if (test_bit(EXTENT_FLAG_PREALLOC, &em->flags)) |
2666 | block_start = EXTENT_MAP_HOLE; | |
d1310b2e CM |
2667 | free_extent_map(em); |
2668 | em = NULL; | |
2669 | ||
2670 | /* we've found a hole, just zero and go on */ | |
2671 | if (block_start == EXTENT_MAP_HOLE) { | |
2672 | char *userpage; | |
507903b8 AJ |
2673 | struct extent_state *cached = NULL; |
2674 | ||
7ac687d9 | 2675 | userpage = kmap_atomic(page); |
306e16ce | 2676 | memset(userpage + pg_offset, 0, iosize); |
d1310b2e | 2677 | flush_dcache_page(page); |
7ac687d9 | 2678 | kunmap_atomic(userpage); |
d1310b2e CM |
2679 | |
2680 | set_extent_uptodate(tree, cur, cur + iosize - 1, | |
507903b8 AJ |
2681 | &cached, GFP_NOFS); |
2682 | unlock_extent_cached(tree, cur, cur + iosize - 1, | |
2683 | &cached, GFP_NOFS); | |
d1310b2e | 2684 | cur = cur + iosize; |
306e16ce | 2685 | pg_offset += iosize; |
d1310b2e CM |
2686 | continue; |
2687 | } | |
2688 | /* the get_extent function already copied into the page */ | |
9655d298 CM |
2689 | if (test_range_bit(tree, cur, cur_end, |
2690 | EXTENT_UPTODATE, 1, NULL)) { | |
a1b32a59 | 2691 | check_page_uptodate(tree, page); |
d0082371 | 2692 | unlock_extent(tree, cur, cur + iosize - 1); |
d1310b2e | 2693 | cur = cur + iosize; |
306e16ce | 2694 | pg_offset += iosize; |
d1310b2e CM |
2695 | continue; |
2696 | } | |
70dec807 CM |
2697 | /* we have an inline extent but it didn't get marked up |
2698 | * to date. Error out | |
2699 | */ | |
2700 | if (block_start == EXTENT_MAP_INLINE) { | |
2701 | SetPageError(page); | |
d0082371 | 2702 | unlock_extent(tree, cur, cur + iosize - 1); |
70dec807 | 2703 | cur = cur + iosize; |
306e16ce | 2704 | pg_offset += iosize; |
70dec807 CM |
2705 | continue; |
2706 | } | |
d1310b2e CM |
2707 | |
2708 | ret = 0; | |
2709 | if (tree->ops && tree->ops->readpage_io_hook) { | |
2710 | ret = tree->ops->readpage_io_hook(page, cur, | |
2711 | cur + iosize - 1); | |
2712 | } | |
2713 | if (!ret) { | |
89642229 CM |
2714 | unsigned long pnr = (last_byte >> PAGE_CACHE_SHIFT) + 1; |
2715 | pnr -= page->index; | |
d1310b2e | 2716 | ret = submit_extent_page(READ, tree, page, |
306e16ce | 2717 | sector, disk_io_size, pg_offset, |
89642229 | 2718 | bdev, bio, pnr, |
c8b97818 CM |
2719 | end_bio_extent_readpage, mirror_num, |
2720 | *bio_flags, | |
2721 | this_bio_flag); | |
79787eaa | 2722 | BUG_ON(ret == -ENOMEM); |
89642229 | 2723 | nr++; |
c8b97818 | 2724 | *bio_flags = this_bio_flag; |
d1310b2e CM |
2725 | } |
2726 | if (ret) | |
2727 | SetPageError(page); | |
2728 | cur = cur + iosize; | |
306e16ce | 2729 | pg_offset += iosize; |
d1310b2e | 2730 | } |
90a887c9 | 2731 | out: |
d1310b2e CM |
2732 | if (!nr) { |
2733 | if (!PageError(page)) | |
2734 | SetPageUptodate(page); | |
2735 | unlock_page(page); | |
2736 | } | |
2737 | return 0; | |
2738 | } | |
2739 | ||
2740 | int extent_read_full_page(struct extent_io_tree *tree, struct page *page, | |
8ddc7d9c | 2741 | get_extent_t *get_extent, int mirror_num) |
d1310b2e CM |
2742 | { |
2743 | struct bio *bio = NULL; | |
c8b97818 | 2744 | unsigned long bio_flags = 0; |
d1310b2e CM |
2745 | int ret; |
2746 | ||
8ddc7d9c | 2747 | ret = __extent_read_full_page(tree, page, get_extent, &bio, mirror_num, |
c8b97818 | 2748 | &bio_flags); |
d1310b2e | 2749 | if (bio) |
8ddc7d9c | 2750 | ret = submit_one_bio(READ, bio, mirror_num, bio_flags); |
d1310b2e CM |
2751 | return ret; |
2752 | } | |
d1310b2e | 2753 | |
11c8349b CM |
2754 | static noinline void update_nr_written(struct page *page, |
2755 | struct writeback_control *wbc, | |
2756 | unsigned long nr_written) | |
2757 | { | |
2758 | wbc->nr_to_write -= nr_written; | |
2759 | if (wbc->range_cyclic || (wbc->nr_to_write > 0 && | |
2760 | wbc->range_start == 0 && wbc->range_end == LLONG_MAX)) | |
2761 | page->mapping->writeback_index = page->index + nr_written; | |
2762 | } | |
2763 | ||
d1310b2e CM |
2764 | /* |
2765 | * the writepage semantics are similar to regular writepage. extent | |
2766 | * records are inserted to lock ranges in the tree, and as dirty areas | |
2767 | * are found, they are marked writeback. Then the lock bits are removed | |
2768 | * and the end_io handler clears the writeback ranges | |
2769 | */ | |
2770 | static int __extent_writepage(struct page *page, struct writeback_control *wbc, | |
2771 | void *data) | |
2772 | { | |
2773 | struct inode *inode = page->mapping->host; | |
2774 | struct extent_page_data *epd = data; | |
2775 | struct extent_io_tree *tree = epd->tree; | |
2776 | u64 start = (u64)page->index << PAGE_CACHE_SHIFT; | |
2777 | u64 delalloc_start; | |
2778 | u64 page_end = start + PAGE_CACHE_SIZE - 1; | |
2779 | u64 end; | |
2780 | u64 cur = start; | |
2781 | u64 extent_offset; | |
2782 | u64 last_byte = i_size_read(inode); | |
2783 | u64 block_start; | |
2784 | u64 iosize; | |
2785 | sector_t sector; | |
2c64c53d | 2786 | struct extent_state *cached_state = NULL; |
d1310b2e CM |
2787 | struct extent_map *em; |
2788 | struct block_device *bdev; | |
2789 | int ret; | |
2790 | int nr = 0; | |
7f3c74fb | 2791 | size_t pg_offset = 0; |
d1310b2e CM |
2792 | size_t blocksize; |
2793 | loff_t i_size = i_size_read(inode); | |
2794 | unsigned long end_index = i_size >> PAGE_CACHE_SHIFT; | |
2795 | u64 nr_delalloc; | |
2796 | u64 delalloc_end; | |
c8b97818 CM |
2797 | int page_started; |
2798 | int compressed; | |
ffbd517d | 2799 | int write_flags; |
771ed689 | 2800 | unsigned long nr_written = 0; |
9e487107 | 2801 | bool fill_delalloc = true; |
d1310b2e | 2802 | |
ffbd517d | 2803 | if (wbc->sync_mode == WB_SYNC_ALL) |
721a9602 | 2804 | write_flags = WRITE_SYNC; |
ffbd517d CM |
2805 | else |
2806 | write_flags = WRITE; | |
2807 | ||
1abe9b8a | 2808 | trace___extent_writepage(page, inode, wbc); |
2809 | ||
d1310b2e | 2810 | WARN_ON(!PageLocked(page)); |
bf0da8c1 CM |
2811 | |
2812 | ClearPageError(page); | |
2813 | ||
7f3c74fb | 2814 | pg_offset = i_size & (PAGE_CACHE_SIZE - 1); |
211c17f5 | 2815 | if (page->index > end_index || |
7f3c74fb | 2816 | (page->index == end_index && !pg_offset)) { |
39be25cd | 2817 | page->mapping->a_ops->invalidatepage(page, 0); |
d1310b2e CM |
2818 | unlock_page(page); |
2819 | return 0; | |
2820 | } | |
2821 | ||
2822 | if (page->index == end_index) { | |
2823 | char *userpage; | |
2824 | ||
7ac687d9 | 2825 | userpage = kmap_atomic(page); |
7f3c74fb CM |
2826 | memset(userpage + pg_offset, 0, |
2827 | PAGE_CACHE_SIZE - pg_offset); | |
7ac687d9 | 2828 | kunmap_atomic(userpage); |
211c17f5 | 2829 | flush_dcache_page(page); |
d1310b2e | 2830 | } |
7f3c74fb | 2831 | pg_offset = 0; |
d1310b2e CM |
2832 | |
2833 | set_page_extent_mapped(page); | |
2834 | ||
9e487107 JB |
2835 | if (!tree->ops || !tree->ops->fill_delalloc) |
2836 | fill_delalloc = false; | |
2837 | ||
d1310b2e CM |
2838 | delalloc_start = start; |
2839 | delalloc_end = 0; | |
c8b97818 | 2840 | page_started = 0; |
9e487107 | 2841 | if (!epd->extent_locked && fill_delalloc) { |
f85d7d6c | 2842 | u64 delalloc_to_write = 0; |
11c8349b CM |
2843 | /* |
2844 | * make sure the wbc mapping index is at least updated | |
2845 | * to this page. | |
2846 | */ | |
2847 | update_nr_written(page, wbc, 0); | |
2848 | ||
d397712b | 2849 | while (delalloc_end < page_end) { |
771ed689 | 2850 | nr_delalloc = find_lock_delalloc_range(inode, tree, |
c8b97818 CM |
2851 | page, |
2852 | &delalloc_start, | |
d1310b2e CM |
2853 | &delalloc_end, |
2854 | 128 * 1024 * 1024); | |
771ed689 CM |
2855 | if (nr_delalloc == 0) { |
2856 | delalloc_start = delalloc_end + 1; | |
2857 | continue; | |
2858 | } | |
013bd4c3 TI |
2859 | ret = tree->ops->fill_delalloc(inode, page, |
2860 | delalloc_start, | |
2861 | delalloc_end, | |
2862 | &page_started, | |
2863 | &nr_written); | |
79787eaa JM |
2864 | /* File system has been set read-only */ |
2865 | if (ret) { | |
2866 | SetPageError(page); | |
2867 | goto done; | |
2868 | } | |
f85d7d6c CM |
2869 | /* |
2870 | * delalloc_end is already one less than the total | |
2871 | * length, so we don't subtract one from | |
2872 | * PAGE_CACHE_SIZE | |
2873 | */ | |
2874 | delalloc_to_write += (delalloc_end - delalloc_start + | |
2875 | PAGE_CACHE_SIZE) >> | |
2876 | PAGE_CACHE_SHIFT; | |
d1310b2e | 2877 | delalloc_start = delalloc_end + 1; |
d1310b2e | 2878 | } |
f85d7d6c CM |
2879 | if (wbc->nr_to_write < delalloc_to_write) { |
2880 | int thresh = 8192; | |
2881 | ||
2882 | if (delalloc_to_write < thresh * 2) | |
2883 | thresh = delalloc_to_write; | |
2884 | wbc->nr_to_write = min_t(u64, delalloc_to_write, | |
2885 | thresh); | |
2886 | } | |
c8b97818 | 2887 | |
771ed689 CM |
2888 | /* did the fill delalloc function already unlock and start |
2889 | * the IO? | |
2890 | */ | |
2891 | if (page_started) { | |
2892 | ret = 0; | |
11c8349b CM |
2893 | /* |
2894 | * we've unlocked the page, so we can't update | |
2895 | * the mapping's writeback index, just update | |
2896 | * nr_to_write. | |
2897 | */ | |
2898 | wbc->nr_to_write -= nr_written; | |
2899 | goto done_unlocked; | |
771ed689 | 2900 | } |
c8b97818 | 2901 | } |
247e743c | 2902 | if (tree->ops && tree->ops->writepage_start_hook) { |
c8b97818 CM |
2903 | ret = tree->ops->writepage_start_hook(page, start, |
2904 | page_end); | |
87826df0 JM |
2905 | if (ret) { |
2906 | /* Fixup worker will requeue */ | |
2907 | if (ret == -EBUSY) | |
2908 | wbc->pages_skipped++; | |
2909 | else | |
2910 | redirty_page_for_writepage(wbc, page); | |
11c8349b | 2911 | update_nr_written(page, wbc, nr_written); |
247e743c | 2912 | unlock_page(page); |
771ed689 | 2913 | ret = 0; |
11c8349b | 2914 | goto done_unlocked; |
247e743c CM |
2915 | } |
2916 | } | |
2917 | ||
11c8349b CM |
2918 | /* |
2919 | * we don't want to touch the inode after unlocking the page, | |
2920 | * so we update the mapping writeback index now | |
2921 | */ | |
2922 | update_nr_written(page, wbc, nr_written + 1); | |
771ed689 | 2923 | |
d1310b2e | 2924 | end = page_end; |
d1310b2e | 2925 | if (last_byte <= start) { |
e6dcd2dc CM |
2926 | if (tree->ops && tree->ops->writepage_end_io_hook) |
2927 | tree->ops->writepage_end_io_hook(page, start, | |
2928 | page_end, NULL, 1); | |
d1310b2e CM |
2929 | goto done; |
2930 | } | |
2931 | ||
d1310b2e CM |
2932 | blocksize = inode->i_sb->s_blocksize; |
2933 | ||
2934 | while (cur <= end) { | |
2935 | if (cur >= last_byte) { | |
e6dcd2dc CM |
2936 | if (tree->ops && tree->ops->writepage_end_io_hook) |
2937 | tree->ops->writepage_end_io_hook(page, cur, | |
2938 | page_end, NULL, 1); | |
d1310b2e CM |
2939 | break; |
2940 | } | |
7f3c74fb | 2941 | em = epd->get_extent(inode, page, pg_offset, cur, |
d1310b2e | 2942 | end - cur + 1, 1); |
c704005d | 2943 | if (IS_ERR_OR_NULL(em)) { |
d1310b2e CM |
2944 | SetPageError(page); |
2945 | break; | |
2946 | } | |
2947 | ||
2948 | extent_offset = cur - em->start; | |
2949 | BUG_ON(extent_map_end(em) <= cur); | |
2950 | BUG_ON(end < cur); | |
2951 | iosize = min(extent_map_end(em) - cur, end - cur + 1); | |
2952 | iosize = (iosize + blocksize - 1) & ~((u64)blocksize - 1); | |
2953 | sector = (em->block_start + extent_offset) >> 9; | |
2954 | bdev = em->bdev; | |
2955 | block_start = em->block_start; | |
c8b97818 | 2956 | compressed = test_bit(EXTENT_FLAG_COMPRESSED, &em->flags); |
d1310b2e CM |
2957 | free_extent_map(em); |
2958 | em = NULL; | |
2959 | ||
c8b97818 CM |
2960 | /* |
2961 | * compressed and inline extents are written through other | |
2962 | * paths in the FS | |
2963 | */ | |
2964 | if (compressed || block_start == EXTENT_MAP_HOLE || | |
d1310b2e | 2965 | block_start == EXTENT_MAP_INLINE) { |
c8b97818 CM |
2966 | /* |
2967 | * end_io notification does not happen here for | |
2968 | * compressed extents | |
2969 | */ | |
2970 | if (!compressed && tree->ops && | |
2971 | tree->ops->writepage_end_io_hook) | |
e6dcd2dc CM |
2972 | tree->ops->writepage_end_io_hook(page, cur, |
2973 | cur + iosize - 1, | |
2974 | NULL, 1); | |
c8b97818 CM |
2975 | else if (compressed) { |
2976 | /* we don't want to end_page_writeback on | |
2977 | * a compressed extent. this happens | |
2978 | * elsewhere | |
2979 | */ | |
2980 | nr++; | |
2981 | } | |
2982 | ||
2983 | cur += iosize; | |
7f3c74fb | 2984 | pg_offset += iosize; |
d1310b2e CM |
2985 | continue; |
2986 | } | |
d1310b2e CM |
2987 | /* leave this out until we have a page_mkwrite call */ |
2988 | if (0 && !test_range_bit(tree, cur, cur + iosize - 1, | |
9655d298 | 2989 | EXTENT_DIRTY, 0, NULL)) { |
d1310b2e | 2990 | cur = cur + iosize; |
7f3c74fb | 2991 | pg_offset += iosize; |
d1310b2e CM |
2992 | continue; |
2993 | } | |
c8b97818 | 2994 | |
d1310b2e CM |
2995 | if (tree->ops && tree->ops->writepage_io_hook) { |
2996 | ret = tree->ops->writepage_io_hook(page, cur, | |
2997 | cur + iosize - 1); | |
2998 | } else { | |
2999 | ret = 0; | |
3000 | } | |
1259ab75 | 3001 | if (ret) { |
d1310b2e | 3002 | SetPageError(page); |
1259ab75 | 3003 | } else { |
d1310b2e | 3004 | unsigned long max_nr = end_index + 1; |
7f3c74fb | 3005 | |
d1310b2e CM |
3006 | set_range_writeback(tree, cur, cur + iosize - 1); |
3007 | if (!PageWriteback(page)) { | |
d397712b CM |
3008 | printk(KERN_ERR "btrfs warning page %lu not " |
3009 | "writeback, cur %llu end %llu\n", | |
3010 | page->index, (unsigned long long)cur, | |
d1310b2e CM |
3011 | (unsigned long long)end); |
3012 | } | |
3013 | ||
ffbd517d CM |
3014 | ret = submit_extent_page(write_flags, tree, page, |
3015 | sector, iosize, pg_offset, | |
3016 | bdev, &epd->bio, max_nr, | |
c8b97818 CM |
3017 | end_bio_extent_writepage, |
3018 | 0, 0, 0); | |
d1310b2e CM |
3019 | if (ret) |
3020 | SetPageError(page); | |
3021 | } | |
3022 | cur = cur + iosize; | |
7f3c74fb | 3023 | pg_offset += iosize; |
d1310b2e CM |
3024 | nr++; |
3025 | } | |
3026 | done: | |
3027 | if (nr == 0) { | |
3028 | /* make sure the mapping tag for page dirty gets cleared */ | |
3029 | set_page_writeback(page); | |
3030 | end_page_writeback(page); | |
3031 | } | |
d1310b2e | 3032 | unlock_page(page); |
771ed689 | 3033 | |
11c8349b CM |
3034 | done_unlocked: |
3035 | ||
2c64c53d CM |
3036 | /* drop our reference on any cached states */ |
3037 | free_extent_state(cached_state); | |
d1310b2e CM |
3038 | return 0; |
3039 | } | |
3040 | ||
0b32f4bb JB |
3041 | static int eb_wait(void *word) |
3042 | { | |
3043 | io_schedule(); | |
3044 | return 0; | |
3045 | } | |
3046 | ||
3047 | static void wait_on_extent_buffer_writeback(struct extent_buffer *eb) | |
3048 | { | |
3049 | wait_on_bit(&eb->bflags, EXTENT_BUFFER_WRITEBACK, eb_wait, | |
3050 | TASK_UNINTERRUPTIBLE); | |
3051 | } | |
3052 | ||
3053 | static int lock_extent_buffer_for_io(struct extent_buffer *eb, | |
3054 | struct btrfs_fs_info *fs_info, | |
3055 | struct extent_page_data *epd) | |
3056 | { | |
3057 | unsigned long i, num_pages; | |
3058 | int flush = 0; | |
3059 | int ret = 0; | |
3060 | ||
3061 | if (!btrfs_try_tree_write_lock(eb)) { | |
3062 | flush = 1; | |
3063 | flush_write_bio(epd); | |
3064 | btrfs_tree_lock(eb); | |
3065 | } | |
3066 | ||
3067 | if (test_bit(EXTENT_BUFFER_WRITEBACK, &eb->bflags)) { | |
3068 | btrfs_tree_unlock(eb); | |
3069 | if (!epd->sync_io) | |
3070 | return 0; | |
3071 | if (!flush) { | |
3072 | flush_write_bio(epd); | |
3073 | flush = 1; | |
3074 | } | |
a098d8e8 CM |
3075 | while (1) { |
3076 | wait_on_extent_buffer_writeback(eb); | |
3077 | btrfs_tree_lock(eb); | |
3078 | if (!test_bit(EXTENT_BUFFER_WRITEBACK, &eb->bflags)) | |
3079 | break; | |
0b32f4bb | 3080 | btrfs_tree_unlock(eb); |
0b32f4bb JB |
3081 | } |
3082 | } | |
3083 | ||
3084 | if (test_and_clear_bit(EXTENT_BUFFER_DIRTY, &eb->bflags)) { | |
3085 | set_bit(EXTENT_BUFFER_WRITEBACK, &eb->bflags); | |
3086 | btrfs_set_header_flag(eb, BTRFS_HEADER_FLAG_WRITTEN); | |
3087 | spin_lock(&fs_info->delalloc_lock); | |
3088 | if (fs_info->dirty_metadata_bytes >= eb->len) | |
3089 | fs_info->dirty_metadata_bytes -= eb->len; | |
3090 | else | |
3091 | WARN_ON(1); | |
3092 | spin_unlock(&fs_info->delalloc_lock); | |
3093 | ret = 1; | |
3094 | } | |
3095 | ||
3096 | btrfs_tree_unlock(eb); | |
3097 | ||
3098 | if (!ret) | |
3099 | return ret; | |
3100 | ||
3101 | num_pages = num_extent_pages(eb->start, eb->len); | |
3102 | for (i = 0; i < num_pages; i++) { | |
3103 | struct page *p = extent_buffer_page(eb, i); | |
3104 | ||
3105 | if (!trylock_page(p)) { | |
3106 | if (!flush) { | |
3107 | flush_write_bio(epd); | |
3108 | flush = 1; | |
3109 | } | |
3110 | lock_page(p); | |
3111 | } | |
3112 | } | |
3113 | ||
3114 | return ret; | |
3115 | } | |
3116 | ||
3117 | static void end_extent_buffer_writeback(struct extent_buffer *eb) | |
3118 | { | |
3119 | clear_bit(EXTENT_BUFFER_WRITEBACK, &eb->bflags); | |
3120 | smp_mb__after_clear_bit(); | |
3121 | wake_up_bit(&eb->bflags, EXTENT_BUFFER_WRITEBACK); | |
3122 | } | |
3123 | ||
3124 | static void end_bio_extent_buffer_writepage(struct bio *bio, int err) | |
3125 | { | |
3126 | int uptodate = err == 0; | |
3127 | struct bio_vec *bvec = bio->bi_io_vec + bio->bi_vcnt - 1; | |
3128 | struct extent_buffer *eb; | |
3129 | int done; | |
3130 | ||
3131 | do { | |
3132 | struct page *page = bvec->bv_page; | |
3133 | ||
3134 | bvec--; | |
3135 | eb = (struct extent_buffer *)page->private; | |
3136 | BUG_ON(!eb); | |
3137 | done = atomic_dec_and_test(&eb->io_pages); | |
3138 | ||
3139 | if (!uptodate || test_bit(EXTENT_BUFFER_IOERR, &eb->bflags)) { | |
3140 | set_bit(EXTENT_BUFFER_IOERR, &eb->bflags); | |
3141 | ClearPageUptodate(page); | |
3142 | SetPageError(page); | |
3143 | } | |
3144 | ||
3145 | end_page_writeback(page); | |
3146 | ||
3147 | if (!done) | |
3148 | continue; | |
3149 | ||
3150 | end_extent_buffer_writeback(eb); | |
3151 | } while (bvec >= bio->bi_io_vec); | |
3152 | ||
3153 | bio_put(bio); | |
3154 | ||
3155 | } | |
3156 | ||
3157 | static int write_one_eb(struct extent_buffer *eb, | |
3158 | struct btrfs_fs_info *fs_info, | |
3159 | struct writeback_control *wbc, | |
3160 | struct extent_page_data *epd) | |
3161 | { | |
3162 | struct block_device *bdev = fs_info->fs_devices->latest_bdev; | |
3163 | u64 offset = eb->start; | |
3164 | unsigned long i, num_pages; | |
3165 | int rw = (epd->sync_io ? WRITE_SYNC : WRITE); | |
d7dbe9e7 | 3166 | int ret = 0; |
0b32f4bb JB |
3167 | |
3168 | clear_bit(EXTENT_BUFFER_IOERR, &eb->bflags); | |
3169 | num_pages = num_extent_pages(eb->start, eb->len); | |
3170 | atomic_set(&eb->io_pages, num_pages); | |
3171 | for (i = 0; i < num_pages; i++) { | |
3172 | struct page *p = extent_buffer_page(eb, i); | |
3173 | ||
3174 | clear_page_dirty_for_io(p); | |
3175 | set_page_writeback(p); | |
3176 | ret = submit_extent_page(rw, eb->tree, p, offset >> 9, | |
3177 | PAGE_CACHE_SIZE, 0, bdev, &epd->bio, | |
3178 | -1, end_bio_extent_buffer_writepage, | |
3179 | 0, 0, 0); | |
3180 | if (ret) { | |
3181 | set_bit(EXTENT_BUFFER_IOERR, &eb->bflags); | |
3182 | SetPageError(p); | |
3183 | if (atomic_sub_and_test(num_pages - i, &eb->io_pages)) | |
3184 | end_extent_buffer_writeback(eb); | |
3185 | ret = -EIO; | |
3186 | break; | |
3187 | } | |
3188 | offset += PAGE_CACHE_SIZE; | |
3189 | update_nr_written(p, wbc, 1); | |
3190 | unlock_page(p); | |
3191 | } | |
3192 | ||
3193 | if (unlikely(ret)) { | |
3194 | for (; i < num_pages; i++) { | |
3195 | struct page *p = extent_buffer_page(eb, i); | |
3196 | unlock_page(p); | |
3197 | } | |
3198 | } | |
3199 | ||
3200 | return ret; | |
3201 | } | |
3202 | ||
3203 | int btree_write_cache_pages(struct address_space *mapping, | |
3204 | struct writeback_control *wbc) | |
3205 | { | |
3206 | struct extent_io_tree *tree = &BTRFS_I(mapping->host)->io_tree; | |
3207 | struct btrfs_fs_info *fs_info = BTRFS_I(mapping->host)->root->fs_info; | |
3208 | struct extent_buffer *eb, *prev_eb = NULL; | |
3209 | struct extent_page_data epd = { | |
3210 | .bio = NULL, | |
3211 | .tree = tree, | |
3212 | .extent_locked = 0, | |
3213 | .sync_io = wbc->sync_mode == WB_SYNC_ALL, | |
3214 | }; | |
3215 | int ret = 0; | |
3216 | int done = 0; | |
3217 | int nr_to_write_done = 0; | |
3218 | struct pagevec pvec; | |
3219 | int nr_pages; | |
3220 | pgoff_t index; | |
3221 | pgoff_t end; /* Inclusive */ | |
3222 | int scanned = 0; | |
3223 | int tag; | |
3224 | ||
3225 | pagevec_init(&pvec, 0); | |
3226 | if (wbc->range_cyclic) { | |
3227 | index = mapping->writeback_index; /* Start from prev offset */ | |
3228 | end = -1; | |
3229 | } else { | |
3230 | index = wbc->range_start >> PAGE_CACHE_SHIFT; | |
3231 | end = wbc->range_end >> PAGE_CACHE_SHIFT; | |
3232 | scanned = 1; | |
3233 | } | |
3234 | if (wbc->sync_mode == WB_SYNC_ALL) | |
3235 | tag = PAGECACHE_TAG_TOWRITE; | |
3236 | else | |
3237 | tag = PAGECACHE_TAG_DIRTY; | |
3238 | retry: | |
3239 | if (wbc->sync_mode == WB_SYNC_ALL) | |
3240 | tag_pages_for_writeback(mapping, index, end); | |
3241 | while (!done && !nr_to_write_done && (index <= end) && | |
3242 | (nr_pages = pagevec_lookup_tag(&pvec, mapping, &index, tag, | |
3243 | min(end - index, (pgoff_t)PAGEVEC_SIZE-1) + 1))) { | |
3244 | unsigned i; | |
3245 | ||
3246 | scanned = 1; | |
3247 | for (i = 0; i < nr_pages; i++) { | |
3248 | struct page *page = pvec.pages[i]; | |
3249 | ||
3250 | if (!PagePrivate(page)) | |
3251 | continue; | |
3252 | ||
3253 | if (!wbc->range_cyclic && page->index > end) { | |
3254 | done = 1; | |
3255 | break; | |
3256 | } | |
3257 | ||
3258 | eb = (struct extent_buffer *)page->private; | |
3259 | if (!eb) { | |
3260 | WARN_ON(1); | |
3261 | continue; | |
3262 | } | |
3263 | ||
3264 | if (eb == prev_eb) | |
3265 | continue; | |
3266 | ||
3267 | if (!atomic_inc_not_zero(&eb->refs)) { | |
3268 | WARN_ON(1); | |
3269 | continue; | |
3270 | } | |
3271 | ||
3272 | prev_eb = eb; | |
3273 | ret = lock_extent_buffer_for_io(eb, fs_info, &epd); | |
3274 | if (!ret) { | |
3275 | free_extent_buffer(eb); | |
3276 | continue; | |
3277 | } | |
3278 | ||
3279 | ret = write_one_eb(eb, fs_info, wbc, &epd); | |
3280 | if (ret) { | |
3281 | done = 1; | |
3282 | free_extent_buffer(eb); | |
3283 | break; | |
3284 | } | |
3285 | free_extent_buffer(eb); | |
3286 | ||
3287 | /* | |
3288 | * the filesystem may choose to bump up nr_to_write. | |
3289 | * We have to make sure to honor the new nr_to_write | |
3290 | * at any time | |
3291 | */ | |
3292 | nr_to_write_done = wbc->nr_to_write <= 0; | |
3293 | } | |
3294 | pagevec_release(&pvec); | |
3295 | cond_resched(); | |
3296 | } | |
3297 | if (!scanned && !done) { | |
3298 | /* | |
3299 | * We hit the last page and there is more work to be done: wrap | |
3300 | * back to the start of the file | |
3301 | */ | |
3302 | scanned = 1; | |
3303 | index = 0; | |
3304 | goto retry; | |
3305 | } | |
3306 | flush_write_bio(&epd); | |
3307 | return ret; | |
3308 | } | |
3309 | ||
d1310b2e | 3310 | /** |
4bef0848 | 3311 | * write_cache_pages - walk the list of dirty pages of the given address space and write all of them. |
d1310b2e CM |
3312 | * @mapping: address space structure to write |
3313 | * @wbc: subtract the number of written pages from *@wbc->nr_to_write | |
3314 | * @writepage: function called for each page | |
3315 | * @data: data passed to writepage function | |
3316 | * | |
3317 | * If a page is already under I/O, write_cache_pages() skips it, even | |
3318 | * if it's dirty. This is desirable behaviour for memory-cleaning writeback, | |
3319 | * but it is INCORRECT for data-integrity system calls such as fsync(). fsync() | |
3320 | * and msync() need to guarantee that all the data which was dirty at the time | |
3321 | * the call was made get new I/O started against them. If wbc->sync_mode is | |
3322 | * WB_SYNC_ALL then we were called for data integrity and we must wait for | |
3323 | * existing IO to complete. | |
3324 | */ | |
b2950863 | 3325 | static int extent_write_cache_pages(struct extent_io_tree *tree, |
4bef0848 CM |
3326 | struct address_space *mapping, |
3327 | struct writeback_control *wbc, | |
d2c3f4f6 CM |
3328 | writepage_t writepage, void *data, |
3329 | void (*flush_fn)(void *)) | |
d1310b2e | 3330 | { |
d1310b2e CM |
3331 | int ret = 0; |
3332 | int done = 0; | |
f85d7d6c | 3333 | int nr_to_write_done = 0; |
d1310b2e CM |
3334 | struct pagevec pvec; |
3335 | int nr_pages; | |
3336 | pgoff_t index; | |
3337 | pgoff_t end; /* Inclusive */ | |
3338 | int scanned = 0; | |
f7aaa06b | 3339 | int tag; |
d1310b2e | 3340 | |
d1310b2e CM |
3341 | pagevec_init(&pvec, 0); |
3342 | if (wbc->range_cyclic) { | |
3343 | index = mapping->writeback_index; /* Start from prev offset */ | |
3344 | end = -1; | |
3345 | } else { | |
3346 | index = wbc->range_start >> PAGE_CACHE_SHIFT; | |
3347 | end = wbc->range_end >> PAGE_CACHE_SHIFT; | |
d1310b2e CM |
3348 | scanned = 1; |
3349 | } | |
f7aaa06b JB |
3350 | if (wbc->sync_mode == WB_SYNC_ALL) |
3351 | tag = PAGECACHE_TAG_TOWRITE; | |
3352 | else | |
3353 | tag = PAGECACHE_TAG_DIRTY; | |
d1310b2e | 3354 | retry: |
f7aaa06b JB |
3355 | if (wbc->sync_mode == WB_SYNC_ALL) |
3356 | tag_pages_for_writeback(mapping, index, end); | |
f85d7d6c | 3357 | while (!done && !nr_to_write_done && (index <= end) && |
f7aaa06b JB |
3358 | (nr_pages = pagevec_lookup_tag(&pvec, mapping, &index, tag, |
3359 | min(end - index, (pgoff_t)PAGEVEC_SIZE-1) + 1))) { | |
d1310b2e CM |
3360 | unsigned i; |
3361 | ||
3362 | scanned = 1; | |
3363 | for (i = 0; i < nr_pages; i++) { | |
3364 | struct page *page = pvec.pages[i]; | |
3365 | ||
3366 | /* | |
3367 | * At this point we hold neither mapping->tree_lock nor | |
3368 | * lock on the page itself: the page may be truncated or | |
3369 | * invalidated (changing page->mapping to NULL), or even | |
3370 | * swizzled back from swapper_space to tmpfs file | |
3371 | * mapping | |
3372 | */ | |
01d658f2 CM |
3373 | if (tree->ops && |
3374 | tree->ops->write_cache_pages_lock_hook) { | |
3375 | tree->ops->write_cache_pages_lock_hook(page, | |
3376 | data, flush_fn); | |
3377 | } else { | |
3378 | if (!trylock_page(page)) { | |
3379 | flush_fn(data); | |
3380 | lock_page(page); | |
3381 | } | |
3382 | } | |
d1310b2e CM |
3383 | |
3384 | if (unlikely(page->mapping != mapping)) { | |
3385 | unlock_page(page); | |
3386 | continue; | |
3387 | } | |
3388 | ||
3389 | if (!wbc->range_cyclic && page->index > end) { | |
3390 | done = 1; | |
3391 | unlock_page(page); | |
3392 | continue; | |
3393 | } | |
3394 | ||
d2c3f4f6 | 3395 | if (wbc->sync_mode != WB_SYNC_NONE) { |
0e6bd956 CM |
3396 | if (PageWriteback(page)) |
3397 | flush_fn(data); | |
d1310b2e | 3398 | wait_on_page_writeback(page); |
d2c3f4f6 | 3399 | } |
d1310b2e CM |
3400 | |
3401 | if (PageWriteback(page) || | |
3402 | !clear_page_dirty_for_io(page)) { | |
3403 | unlock_page(page); | |
3404 | continue; | |
3405 | } | |
3406 | ||
3407 | ret = (*writepage)(page, wbc, data); | |
3408 | ||
3409 | if (unlikely(ret == AOP_WRITEPAGE_ACTIVATE)) { | |
3410 | unlock_page(page); | |
3411 | ret = 0; | |
3412 | } | |
f85d7d6c | 3413 | if (ret) |
d1310b2e | 3414 | done = 1; |
f85d7d6c CM |
3415 | |
3416 | /* | |
3417 | * the filesystem may choose to bump up nr_to_write. | |
3418 | * We have to make sure to honor the new nr_to_write | |
3419 | * at any time | |
3420 | */ | |
3421 | nr_to_write_done = wbc->nr_to_write <= 0; | |
d1310b2e CM |
3422 | } |
3423 | pagevec_release(&pvec); | |
3424 | cond_resched(); | |
3425 | } | |
3426 | if (!scanned && !done) { | |
3427 | /* | |
3428 | * We hit the last page and there is more work to be done: wrap | |
3429 | * back to the start of the file | |
3430 | */ | |
3431 | scanned = 1; | |
3432 | index = 0; | |
3433 | goto retry; | |
3434 | } | |
d1310b2e CM |
3435 | return ret; |
3436 | } | |
d1310b2e | 3437 | |
ffbd517d | 3438 | static void flush_epd_write_bio(struct extent_page_data *epd) |
d2c3f4f6 | 3439 | { |
d2c3f4f6 | 3440 | if (epd->bio) { |
355808c2 JM |
3441 | int rw = WRITE; |
3442 | int ret; | |
3443 | ||
ffbd517d | 3444 | if (epd->sync_io) |
355808c2 JM |
3445 | rw = WRITE_SYNC; |
3446 | ||
3447 | ret = submit_one_bio(rw, epd->bio, 0, 0); | |
79787eaa | 3448 | BUG_ON(ret < 0); /* -ENOMEM */ |
d2c3f4f6 CM |
3449 | epd->bio = NULL; |
3450 | } | |
3451 | } | |
3452 | ||
ffbd517d CM |
3453 | static noinline void flush_write_bio(void *data) |
3454 | { | |
3455 | struct extent_page_data *epd = data; | |
3456 | flush_epd_write_bio(epd); | |
3457 | } | |
3458 | ||
d1310b2e CM |
3459 | int extent_write_full_page(struct extent_io_tree *tree, struct page *page, |
3460 | get_extent_t *get_extent, | |
3461 | struct writeback_control *wbc) | |
3462 | { | |
3463 | int ret; | |
d1310b2e CM |
3464 | struct extent_page_data epd = { |
3465 | .bio = NULL, | |
3466 | .tree = tree, | |
3467 | .get_extent = get_extent, | |
771ed689 | 3468 | .extent_locked = 0, |
ffbd517d | 3469 | .sync_io = wbc->sync_mode == WB_SYNC_ALL, |
d1310b2e | 3470 | }; |
d1310b2e | 3471 | |
d1310b2e CM |
3472 | ret = __extent_writepage(page, wbc, &epd); |
3473 | ||
ffbd517d | 3474 | flush_epd_write_bio(&epd); |
d1310b2e CM |
3475 | return ret; |
3476 | } | |
d1310b2e | 3477 | |
771ed689 CM |
3478 | int extent_write_locked_range(struct extent_io_tree *tree, struct inode *inode, |
3479 | u64 start, u64 end, get_extent_t *get_extent, | |
3480 | int mode) | |
3481 | { | |
3482 | int ret = 0; | |
3483 | struct address_space *mapping = inode->i_mapping; | |
3484 | struct page *page; | |
3485 | unsigned long nr_pages = (end - start + PAGE_CACHE_SIZE) >> | |
3486 | PAGE_CACHE_SHIFT; | |
3487 | ||
3488 | struct extent_page_data epd = { | |
3489 | .bio = NULL, | |
3490 | .tree = tree, | |
3491 | .get_extent = get_extent, | |
3492 | .extent_locked = 1, | |
ffbd517d | 3493 | .sync_io = mode == WB_SYNC_ALL, |
771ed689 CM |
3494 | }; |
3495 | struct writeback_control wbc_writepages = { | |
771ed689 | 3496 | .sync_mode = mode, |
771ed689 CM |
3497 | .nr_to_write = nr_pages * 2, |
3498 | .range_start = start, | |
3499 | .range_end = end + 1, | |
3500 | }; | |
3501 | ||
d397712b | 3502 | while (start <= end) { |
771ed689 CM |
3503 | page = find_get_page(mapping, start >> PAGE_CACHE_SHIFT); |
3504 | if (clear_page_dirty_for_io(page)) | |
3505 | ret = __extent_writepage(page, &wbc_writepages, &epd); | |
3506 | else { | |
3507 | if (tree->ops && tree->ops->writepage_end_io_hook) | |
3508 | tree->ops->writepage_end_io_hook(page, start, | |
3509 | start + PAGE_CACHE_SIZE - 1, | |
3510 | NULL, 1); | |
3511 | unlock_page(page); | |
3512 | } | |
3513 | page_cache_release(page); | |
3514 | start += PAGE_CACHE_SIZE; | |
3515 | } | |
3516 | ||
ffbd517d | 3517 | flush_epd_write_bio(&epd); |
771ed689 CM |
3518 | return ret; |
3519 | } | |
d1310b2e CM |
3520 | |
3521 | int extent_writepages(struct extent_io_tree *tree, | |
3522 | struct address_space *mapping, | |
3523 | get_extent_t *get_extent, | |
3524 | struct writeback_control *wbc) | |
3525 | { | |
3526 | int ret = 0; | |
3527 | struct extent_page_data epd = { | |
3528 | .bio = NULL, | |
3529 | .tree = tree, | |
3530 | .get_extent = get_extent, | |
771ed689 | 3531 | .extent_locked = 0, |
ffbd517d | 3532 | .sync_io = wbc->sync_mode == WB_SYNC_ALL, |
d1310b2e CM |
3533 | }; |
3534 | ||
4bef0848 | 3535 | ret = extent_write_cache_pages(tree, mapping, wbc, |
d2c3f4f6 CM |
3536 | __extent_writepage, &epd, |
3537 | flush_write_bio); | |
ffbd517d | 3538 | flush_epd_write_bio(&epd); |
d1310b2e CM |
3539 | return ret; |
3540 | } | |
d1310b2e CM |
3541 | |
3542 | int extent_readpages(struct extent_io_tree *tree, | |
3543 | struct address_space *mapping, | |
3544 | struct list_head *pages, unsigned nr_pages, | |
3545 | get_extent_t get_extent) | |
3546 | { | |
3547 | struct bio *bio = NULL; | |
3548 | unsigned page_idx; | |
c8b97818 | 3549 | unsigned long bio_flags = 0; |
d1310b2e | 3550 | |
d1310b2e CM |
3551 | for (page_idx = 0; page_idx < nr_pages; page_idx++) { |
3552 | struct page *page = list_entry(pages->prev, struct page, lru); | |
3553 | ||
3554 | prefetchw(&page->flags); | |
3555 | list_del(&page->lru); | |
28ecb609 | 3556 | if (!add_to_page_cache_lru(page, mapping, |
43e817a1 | 3557 | page->index, GFP_NOFS)) { |
f188591e | 3558 | __extent_read_full_page(tree, page, get_extent, |
c8b97818 | 3559 | &bio, 0, &bio_flags); |
d1310b2e CM |
3560 | } |
3561 | page_cache_release(page); | |
3562 | } | |
d1310b2e CM |
3563 | BUG_ON(!list_empty(pages)); |
3564 | if (bio) | |
79787eaa | 3565 | return submit_one_bio(READ, bio, 0, bio_flags); |
d1310b2e CM |
3566 | return 0; |
3567 | } | |
d1310b2e CM |
3568 | |
3569 | /* | |
3570 | * basic invalidatepage code, this waits on any locked or writeback | |
3571 | * ranges corresponding to the page, and then deletes any extent state | |
3572 | * records from the tree | |
3573 | */ | |
3574 | int extent_invalidatepage(struct extent_io_tree *tree, | |
3575 | struct page *page, unsigned long offset) | |
3576 | { | |
2ac55d41 | 3577 | struct extent_state *cached_state = NULL; |
d1310b2e CM |
3578 | u64 start = ((u64)page->index << PAGE_CACHE_SHIFT); |
3579 | u64 end = start + PAGE_CACHE_SIZE - 1; | |
3580 | size_t blocksize = page->mapping->host->i_sb->s_blocksize; | |
3581 | ||
d397712b | 3582 | start += (offset + blocksize - 1) & ~(blocksize - 1); |
d1310b2e CM |
3583 | if (start > end) |
3584 | return 0; | |
3585 | ||
d0082371 | 3586 | lock_extent_bits(tree, start, end, 0, &cached_state); |
1edbb734 | 3587 | wait_on_page_writeback(page); |
d1310b2e | 3588 | clear_extent_bit(tree, start, end, |
32c00aff JB |
3589 | EXTENT_LOCKED | EXTENT_DIRTY | EXTENT_DELALLOC | |
3590 | EXTENT_DO_ACCOUNTING, | |
2ac55d41 | 3591 | 1, 1, &cached_state, GFP_NOFS); |
d1310b2e CM |
3592 | return 0; |
3593 | } | |
d1310b2e | 3594 | |
7b13b7b1 CM |
3595 | /* |
3596 | * a helper for releasepage, this tests for areas of the page that | |
3597 | * are locked or under IO and drops the related state bits if it is safe | |
3598 | * to drop the page. | |
3599 | */ | |
3600 | int try_release_extent_state(struct extent_map_tree *map, | |
3601 | struct extent_io_tree *tree, struct page *page, | |
3602 | gfp_t mask) | |
3603 | { | |
3604 | u64 start = (u64)page->index << PAGE_CACHE_SHIFT; | |
3605 | u64 end = start + PAGE_CACHE_SIZE - 1; | |
3606 | int ret = 1; | |
3607 | ||
211f90e6 | 3608 | if (test_range_bit(tree, start, end, |
8b62b72b | 3609 | EXTENT_IOBITS, 0, NULL)) |
7b13b7b1 CM |
3610 | ret = 0; |
3611 | else { | |
3612 | if ((mask & GFP_NOFS) == GFP_NOFS) | |
3613 | mask = GFP_NOFS; | |
11ef160f CM |
3614 | /* |
3615 | * at this point we can safely clear everything except the | |
3616 | * locked bit and the nodatasum bit | |
3617 | */ | |
e3f24cc5 | 3618 | ret = clear_extent_bit(tree, start, end, |
11ef160f CM |
3619 | ~(EXTENT_LOCKED | EXTENT_NODATASUM), |
3620 | 0, 0, NULL, mask); | |
e3f24cc5 CM |
3621 | |
3622 | /* if clear_extent_bit failed for enomem reasons, | |
3623 | * we can't allow the release to continue. | |
3624 | */ | |
3625 | if (ret < 0) | |
3626 | ret = 0; | |
3627 | else | |
3628 | ret = 1; | |
7b13b7b1 CM |
3629 | } |
3630 | return ret; | |
3631 | } | |
7b13b7b1 | 3632 | |
d1310b2e CM |
3633 | /* |
3634 | * a helper for releasepage. As long as there are no locked extents | |
3635 | * in the range corresponding to the page, both state records and extent | |
3636 | * map records are removed | |
3637 | */ | |
3638 | int try_release_extent_mapping(struct extent_map_tree *map, | |
70dec807 CM |
3639 | struct extent_io_tree *tree, struct page *page, |
3640 | gfp_t mask) | |
d1310b2e CM |
3641 | { |
3642 | struct extent_map *em; | |
3643 | u64 start = (u64)page->index << PAGE_CACHE_SHIFT; | |
3644 | u64 end = start + PAGE_CACHE_SIZE - 1; | |
7b13b7b1 | 3645 | |
70dec807 CM |
3646 | if ((mask & __GFP_WAIT) && |
3647 | page->mapping->host->i_size > 16 * 1024 * 1024) { | |
39b5637f | 3648 | u64 len; |
70dec807 | 3649 | while (start <= end) { |
39b5637f | 3650 | len = end - start + 1; |
890871be | 3651 | write_lock(&map->lock); |
39b5637f | 3652 | em = lookup_extent_mapping(map, start, len); |
285190d9 | 3653 | if (!em) { |
890871be | 3654 | write_unlock(&map->lock); |
70dec807 CM |
3655 | break; |
3656 | } | |
7f3c74fb CM |
3657 | if (test_bit(EXTENT_FLAG_PINNED, &em->flags) || |
3658 | em->start != start) { | |
890871be | 3659 | write_unlock(&map->lock); |
70dec807 CM |
3660 | free_extent_map(em); |
3661 | break; | |
3662 | } | |
3663 | if (!test_range_bit(tree, em->start, | |
3664 | extent_map_end(em) - 1, | |
8b62b72b | 3665 | EXTENT_LOCKED | EXTENT_WRITEBACK, |
9655d298 | 3666 | 0, NULL)) { |
70dec807 CM |
3667 | remove_extent_mapping(map, em); |
3668 | /* once for the rb tree */ | |
3669 | free_extent_map(em); | |
3670 | } | |
3671 | start = extent_map_end(em); | |
890871be | 3672 | write_unlock(&map->lock); |
70dec807 CM |
3673 | |
3674 | /* once for us */ | |
d1310b2e CM |
3675 | free_extent_map(em); |
3676 | } | |
d1310b2e | 3677 | } |
7b13b7b1 | 3678 | return try_release_extent_state(map, tree, page, mask); |
d1310b2e | 3679 | } |
d1310b2e | 3680 | |
ec29ed5b CM |
3681 | /* |
3682 | * helper function for fiemap, which doesn't want to see any holes. | |
3683 | * This maps until we find something past 'last' | |
3684 | */ | |
3685 | static struct extent_map *get_extent_skip_holes(struct inode *inode, | |
3686 | u64 offset, | |
3687 | u64 last, | |
3688 | get_extent_t *get_extent) | |
3689 | { | |
3690 | u64 sectorsize = BTRFS_I(inode)->root->sectorsize; | |
3691 | struct extent_map *em; | |
3692 | u64 len; | |
3693 | ||
3694 | if (offset >= last) | |
3695 | return NULL; | |
3696 | ||
3697 | while(1) { | |
3698 | len = last - offset; | |
3699 | if (len == 0) | |
3700 | break; | |
3701 | len = (len + sectorsize - 1) & ~(sectorsize - 1); | |
3702 | em = get_extent(inode, NULL, 0, offset, len, 0); | |
c704005d | 3703 | if (IS_ERR_OR_NULL(em)) |
ec29ed5b CM |
3704 | return em; |
3705 | ||
3706 | /* if this isn't a hole return it */ | |
3707 | if (!test_bit(EXTENT_FLAG_VACANCY, &em->flags) && | |
3708 | em->block_start != EXTENT_MAP_HOLE) { | |
3709 | return em; | |
3710 | } | |
3711 | ||
3712 | /* this is a hole, advance to the next extent */ | |
3713 | offset = extent_map_end(em); | |
3714 | free_extent_map(em); | |
3715 | if (offset >= last) | |
3716 | break; | |
3717 | } | |
3718 | return NULL; | |
3719 | } | |
3720 | ||
1506fcc8 YS |
3721 | int extent_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, |
3722 | __u64 start, __u64 len, get_extent_t *get_extent) | |
3723 | { | |
975f84fe | 3724 | int ret = 0; |
1506fcc8 YS |
3725 | u64 off = start; |
3726 | u64 max = start + len; | |
3727 | u32 flags = 0; | |
975f84fe JB |
3728 | u32 found_type; |
3729 | u64 last; | |
ec29ed5b | 3730 | u64 last_for_get_extent = 0; |
1506fcc8 | 3731 | u64 disko = 0; |
ec29ed5b | 3732 | u64 isize = i_size_read(inode); |
975f84fe | 3733 | struct btrfs_key found_key; |
1506fcc8 | 3734 | struct extent_map *em = NULL; |
2ac55d41 | 3735 | struct extent_state *cached_state = NULL; |
975f84fe JB |
3736 | struct btrfs_path *path; |
3737 | struct btrfs_file_extent_item *item; | |
1506fcc8 | 3738 | int end = 0; |
ec29ed5b CM |
3739 | u64 em_start = 0; |
3740 | u64 em_len = 0; | |
3741 | u64 em_end = 0; | |
1506fcc8 | 3742 | unsigned long emflags; |
1506fcc8 YS |
3743 | |
3744 | if (len == 0) | |
3745 | return -EINVAL; | |
3746 | ||
975f84fe JB |
3747 | path = btrfs_alloc_path(); |
3748 | if (!path) | |
3749 | return -ENOMEM; | |
3750 | path->leave_spinning = 1; | |
3751 | ||
4d479cf0 JB |
3752 | start = ALIGN(start, BTRFS_I(inode)->root->sectorsize); |
3753 | len = ALIGN(len, BTRFS_I(inode)->root->sectorsize); | |
3754 | ||
ec29ed5b CM |
3755 | /* |
3756 | * lookup the last file extent. We're not using i_size here | |
3757 | * because there might be preallocation past i_size | |
3758 | */ | |
975f84fe | 3759 | ret = btrfs_lookup_file_extent(NULL, BTRFS_I(inode)->root, |
33345d01 | 3760 | path, btrfs_ino(inode), -1, 0); |
975f84fe JB |
3761 | if (ret < 0) { |
3762 | btrfs_free_path(path); | |
3763 | return ret; | |
3764 | } | |
3765 | WARN_ON(!ret); | |
3766 | path->slots[0]--; | |
3767 | item = btrfs_item_ptr(path->nodes[0], path->slots[0], | |
3768 | struct btrfs_file_extent_item); | |
3769 | btrfs_item_key_to_cpu(path->nodes[0], &found_key, path->slots[0]); | |
3770 | found_type = btrfs_key_type(&found_key); | |
3771 | ||
ec29ed5b | 3772 | /* No extents, but there might be delalloc bits */ |
33345d01 | 3773 | if (found_key.objectid != btrfs_ino(inode) || |
975f84fe | 3774 | found_type != BTRFS_EXTENT_DATA_KEY) { |
ec29ed5b CM |
3775 | /* have to trust i_size as the end */ |
3776 | last = (u64)-1; | |
3777 | last_for_get_extent = isize; | |
3778 | } else { | |
3779 | /* | |
3780 | * remember the start of the last extent. There are a | |
3781 | * bunch of different factors that go into the length of the | |
3782 | * extent, so its much less complex to remember where it started | |
3783 | */ | |
3784 | last = found_key.offset; | |
3785 | last_for_get_extent = last + 1; | |
975f84fe | 3786 | } |
975f84fe JB |
3787 | btrfs_free_path(path); |
3788 | ||
ec29ed5b CM |
3789 | /* |
3790 | * we might have some extents allocated but more delalloc past those | |
3791 | * extents. so, we trust isize unless the start of the last extent is | |
3792 | * beyond isize | |
3793 | */ | |
3794 | if (last < isize) { | |
3795 | last = (u64)-1; | |
3796 | last_for_get_extent = isize; | |
3797 | } | |
3798 | ||
2ac55d41 | 3799 | lock_extent_bits(&BTRFS_I(inode)->io_tree, start, start + len, 0, |
d0082371 | 3800 | &cached_state); |
ec29ed5b | 3801 | |
4d479cf0 | 3802 | em = get_extent_skip_holes(inode, start, last_for_get_extent, |
ec29ed5b | 3803 | get_extent); |
1506fcc8 YS |
3804 | if (!em) |
3805 | goto out; | |
3806 | if (IS_ERR(em)) { | |
3807 | ret = PTR_ERR(em); | |
3808 | goto out; | |
3809 | } | |
975f84fe | 3810 | |
1506fcc8 | 3811 | while (!end) { |
ea8efc74 CM |
3812 | u64 offset_in_extent; |
3813 | ||
3814 | /* break if the extent we found is outside the range */ | |
3815 | if (em->start >= max || extent_map_end(em) < off) | |
3816 | break; | |
3817 | ||
3818 | /* | |
3819 | * get_extent may return an extent that starts before our | |
3820 | * requested range. We have to make sure the ranges | |
3821 | * we return to fiemap always move forward and don't | |
3822 | * overlap, so adjust the offsets here | |
3823 | */ | |
3824 | em_start = max(em->start, off); | |
1506fcc8 | 3825 | |
ea8efc74 CM |
3826 | /* |
3827 | * record the offset from the start of the extent | |
3828 | * for adjusting the disk offset below | |
3829 | */ | |
3830 | offset_in_extent = em_start - em->start; | |
ec29ed5b | 3831 | em_end = extent_map_end(em); |
ea8efc74 | 3832 | em_len = em_end - em_start; |
ec29ed5b | 3833 | emflags = em->flags; |
1506fcc8 YS |
3834 | disko = 0; |
3835 | flags = 0; | |
3836 | ||
ea8efc74 CM |
3837 | /* |
3838 | * bump off for our next call to get_extent | |
3839 | */ | |
3840 | off = extent_map_end(em); | |
3841 | if (off >= max) | |
3842 | end = 1; | |
3843 | ||
93dbfad7 | 3844 | if (em->block_start == EXTENT_MAP_LAST_BYTE) { |
1506fcc8 YS |
3845 | end = 1; |
3846 | flags |= FIEMAP_EXTENT_LAST; | |
93dbfad7 | 3847 | } else if (em->block_start == EXTENT_MAP_INLINE) { |
1506fcc8 YS |
3848 | flags |= (FIEMAP_EXTENT_DATA_INLINE | |
3849 | FIEMAP_EXTENT_NOT_ALIGNED); | |
93dbfad7 | 3850 | } else if (em->block_start == EXTENT_MAP_DELALLOC) { |
1506fcc8 YS |
3851 | flags |= (FIEMAP_EXTENT_DELALLOC | |
3852 | FIEMAP_EXTENT_UNKNOWN); | |
93dbfad7 | 3853 | } else { |
ea8efc74 | 3854 | disko = em->block_start + offset_in_extent; |
1506fcc8 YS |
3855 | } |
3856 | if (test_bit(EXTENT_FLAG_COMPRESSED, &em->flags)) | |
3857 | flags |= FIEMAP_EXTENT_ENCODED; | |
3858 | ||
1506fcc8 YS |
3859 | free_extent_map(em); |
3860 | em = NULL; | |
ec29ed5b CM |
3861 | if ((em_start >= last) || em_len == (u64)-1 || |
3862 | (last == (u64)-1 && isize <= em_end)) { | |
1506fcc8 YS |
3863 | flags |= FIEMAP_EXTENT_LAST; |
3864 | end = 1; | |
3865 | } | |
3866 | ||
ec29ed5b CM |
3867 | /* now scan forward to see if this is really the last extent. */ |
3868 | em = get_extent_skip_holes(inode, off, last_for_get_extent, | |
3869 | get_extent); | |
3870 | if (IS_ERR(em)) { | |
3871 | ret = PTR_ERR(em); | |
3872 | goto out; | |
3873 | } | |
3874 | if (!em) { | |
975f84fe JB |
3875 | flags |= FIEMAP_EXTENT_LAST; |
3876 | end = 1; | |
3877 | } | |
ec29ed5b CM |
3878 | ret = fiemap_fill_next_extent(fieinfo, em_start, disko, |
3879 | em_len, flags); | |
3880 | if (ret) | |
3881 | goto out_free; | |
1506fcc8 YS |
3882 | } |
3883 | out_free: | |
3884 | free_extent_map(em); | |
3885 | out: | |
2ac55d41 JB |
3886 | unlock_extent_cached(&BTRFS_I(inode)->io_tree, start, start + len, |
3887 | &cached_state, GFP_NOFS); | |
1506fcc8 YS |
3888 | return ret; |
3889 | } | |
3890 | ||
4a54c8c1 | 3891 | inline struct page *extent_buffer_page(struct extent_buffer *eb, |
d1310b2e CM |
3892 | unsigned long i) |
3893 | { | |
727011e0 | 3894 | return eb->pages[i]; |
d1310b2e CM |
3895 | } |
3896 | ||
4a54c8c1 | 3897 | inline unsigned long num_extent_pages(u64 start, u64 len) |
728131d8 | 3898 | { |
6af118ce CM |
3899 | return ((start + len + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT) - |
3900 | (start >> PAGE_CACHE_SHIFT); | |
728131d8 CM |
3901 | } |
3902 | ||
727011e0 CM |
3903 | static void __free_extent_buffer(struct extent_buffer *eb) |
3904 | { | |
3905 | #if LEAK_DEBUG | |
3906 | unsigned long flags; | |
3907 | spin_lock_irqsave(&leak_lock, flags); | |
3908 | list_del(&eb->leak_list); | |
3909 | spin_unlock_irqrestore(&leak_lock, flags); | |
3910 | #endif | |
3911 | if (eb->pages && eb->pages != eb->inline_pages) | |
3912 | kfree(eb->pages); | |
3913 | kmem_cache_free(extent_buffer_cache, eb); | |
3914 | } | |
3915 | ||
d1310b2e CM |
3916 | static struct extent_buffer *__alloc_extent_buffer(struct extent_io_tree *tree, |
3917 | u64 start, | |
3918 | unsigned long len, | |
3919 | gfp_t mask) | |
3920 | { | |
3921 | struct extent_buffer *eb = NULL; | |
3935127c | 3922 | #if LEAK_DEBUG |
2d2ae547 | 3923 | unsigned long flags; |
4bef0848 | 3924 | #endif |
d1310b2e | 3925 | |
d1310b2e | 3926 | eb = kmem_cache_zalloc(extent_buffer_cache, mask); |
91ca338d TI |
3927 | if (eb == NULL) |
3928 | return NULL; | |
d1310b2e CM |
3929 | eb->start = start; |
3930 | eb->len = len; | |
4f2de97a | 3931 | eb->tree = tree; |
bd681513 CM |
3932 | rwlock_init(&eb->lock); |
3933 | atomic_set(&eb->write_locks, 0); | |
3934 | atomic_set(&eb->read_locks, 0); | |
3935 | atomic_set(&eb->blocking_readers, 0); | |
3936 | atomic_set(&eb->blocking_writers, 0); | |
3937 | atomic_set(&eb->spinning_readers, 0); | |
3938 | atomic_set(&eb->spinning_writers, 0); | |
5b25f70f | 3939 | eb->lock_nested = 0; |
bd681513 CM |
3940 | init_waitqueue_head(&eb->write_lock_wq); |
3941 | init_waitqueue_head(&eb->read_lock_wq); | |
b4ce94de | 3942 | |
3935127c | 3943 | #if LEAK_DEBUG |
2d2ae547 CM |
3944 | spin_lock_irqsave(&leak_lock, flags); |
3945 | list_add(&eb->leak_list, &buffers); | |
3946 | spin_unlock_irqrestore(&leak_lock, flags); | |
4bef0848 | 3947 | #endif |
3083ee2e | 3948 | spin_lock_init(&eb->refs_lock); |
d1310b2e | 3949 | atomic_set(&eb->refs, 1); |
0b32f4bb | 3950 | atomic_set(&eb->io_pages, 0); |
727011e0 CM |
3951 | |
3952 | if (len > MAX_INLINE_EXTENT_BUFFER_SIZE) { | |
3953 | struct page **pages; | |
3954 | int num_pages = (len + PAGE_CACHE_SIZE - 1) >> | |
3955 | PAGE_CACHE_SHIFT; | |
3956 | pages = kzalloc(num_pages, mask); | |
3957 | if (!pages) { | |
3958 | __free_extent_buffer(eb); | |
3959 | return NULL; | |
3960 | } | |
3961 | eb->pages = pages; | |
3962 | } else { | |
3963 | eb->pages = eb->inline_pages; | |
3964 | } | |
d1310b2e CM |
3965 | |
3966 | return eb; | |
3967 | } | |
3968 | ||
0b32f4bb | 3969 | static int extent_buffer_under_io(struct extent_buffer *eb) |
d1310b2e | 3970 | { |
0b32f4bb JB |
3971 | return (atomic_read(&eb->io_pages) || |
3972 | test_bit(EXTENT_BUFFER_WRITEBACK, &eb->bflags) || | |
3973 | test_bit(EXTENT_BUFFER_DIRTY, &eb->bflags)); | |
d1310b2e CM |
3974 | } |
3975 | ||
897ca6e9 MX |
3976 | /* |
3977 | * Helper for releasing extent buffer page. | |
3978 | */ | |
3979 | static void btrfs_release_extent_buffer_page(struct extent_buffer *eb, | |
3980 | unsigned long start_idx) | |
3981 | { | |
3982 | unsigned long index; | |
39bab87b | 3983 | unsigned long num_pages; |
897ca6e9 MX |
3984 | struct page *page; |
3985 | ||
0b32f4bb | 3986 | BUG_ON(extent_buffer_under_io(eb)); |
897ca6e9 | 3987 | |
39bab87b WSH |
3988 | num_pages = num_extent_pages(eb->start, eb->len); |
3989 | index = start_idx + num_pages; | |
897ca6e9 MX |
3990 | if (start_idx >= index) |
3991 | return; | |
3992 | ||
3993 | do { | |
3994 | index--; | |
3995 | page = extent_buffer_page(eb, index); | |
4f2de97a JB |
3996 | if (page) { |
3997 | spin_lock(&page->mapping->private_lock); | |
3998 | /* | |
3999 | * We do this since we'll remove the pages after we've | |
4000 | * removed the eb from the radix tree, so we could race | |
4001 | * and have this page now attached to the new eb. So | |
4002 | * only clear page_private if it's still connected to | |
4003 | * this eb. | |
4004 | */ | |
4005 | if (PagePrivate(page) && | |
4006 | page->private == (unsigned long)eb) { | |
0b32f4bb | 4007 | BUG_ON(test_bit(EXTENT_BUFFER_DIRTY, &eb->bflags)); |
3083ee2e JB |
4008 | BUG_ON(PageDirty(page)); |
4009 | BUG_ON(PageWriteback(page)); | |
4f2de97a JB |
4010 | /* |
4011 | * We need to make sure we haven't be attached | |
4012 | * to a new eb. | |
4013 | */ | |
4014 | ClearPagePrivate(page); | |
4015 | set_page_private(page, 0); | |
4016 | /* One for the page private */ | |
4017 | page_cache_release(page); | |
4018 | } | |
4019 | spin_unlock(&page->mapping->private_lock); | |
4020 | ||
4021 | /* One for when we alloced the page */ | |
897ca6e9 | 4022 | page_cache_release(page); |
4f2de97a | 4023 | } |
897ca6e9 MX |
4024 | } while (index != start_idx); |
4025 | } | |
4026 | ||
4027 | /* | |
4028 | * Helper for releasing the extent buffer. | |
4029 | */ | |
4030 | static inline void btrfs_release_extent_buffer(struct extent_buffer *eb) | |
4031 | { | |
4032 | btrfs_release_extent_buffer_page(eb, 0); | |
4033 | __free_extent_buffer(eb); | |
4034 | } | |
4035 | ||
0b32f4bb JB |
4036 | static void check_buffer_tree_ref(struct extent_buffer *eb) |
4037 | { | |
4038 | /* the ref bit is tricky. We have to make sure it is set | |
4039 | * if we have the buffer dirty. Otherwise the | |
4040 | * code to free a buffer can end up dropping a dirty | |
4041 | * page | |
4042 | * | |
4043 | * Once the ref bit is set, it won't go away while the | |
4044 | * buffer is dirty or in writeback, and it also won't | |
4045 | * go away while we have the reference count on the | |
4046 | * eb bumped. | |
4047 | * | |
4048 | * We can't just set the ref bit without bumping the | |
4049 | * ref on the eb because free_extent_buffer might | |
4050 | * see the ref bit and try to clear it. If this happens | |
4051 | * free_extent_buffer might end up dropping our original | |
4052 | * ref by mistake and freeing the page before we are able | |
4053 | * to add one more ref. | |
4054 | * | |
4055 | * So bump the ref count first, then set the bit. If someone | |
4056 | * beat us to it, drop the ref we added. | |
4057 | */ | |
4058 | if (!test_bit(EXTENT_BUFFER_TREE_REF, &eb->bflags)) { | |
4059 | atomic_inc(&eb->refs); | |
4060 | if (test_and_set_bit(EXTENT_BUFFER_TREE_REF, &eb->bflags)) | |
4061 | atomic_dec(&eb->refs); | |
4062 | } | |
4063 | } | |
4064 | ||
5df4235e JB |
4065 | static void mark_extent_buffer_accessed(struct extent_buffer *eb) |
4066 | { | |
4067 | unsigned long num_pages, i; | |
4068 | ||
0b32f4bb JB |
4069 | check_buffer_tree_ref(eb); |
4070 | ||
5df4235e JB |
4071 | num_pages = num_extent_pages(eb->start, eb->len); |
4072 | for (i = 0; i < num_pages; i++) { | |
4073 | struct page *p = extent_buffer_page(eb, i); | |
4074 | mark_page_accessed(p); | |
4075 | } | |
4076 | } | |
4077 | ||
d1310b2e | 4078 | struct extent_buffer *alloc_extent_buffer(struct extent_io_tree *tree, |
727011e0 | 4079 | u64 start, unsigned long len) |
d1310b2e CM |
4080 | { |
4081 | unsigned long num_pages = num_extent_pages(start, len); | |
4082 | unsigned long i; | |
4083 | unsigned long index = start >> PAGE_CACHE_SHIFT; | |
4084 | struct extent_buffer *eb; | |
6af118ce | 4085 | struct extent_buffer *exists = NULL; |
d1310b2e CM |
4086 | struct page *p; |
4087 | struct address_space *mapping = tree->mapping; | |
4088 | int uptodate = 1; | |
19fe0a8b | 4089 | int ret; |
d1310b2e | 4090 | |
19fe0a8b MX |
4091 | rcu_read_lock(); |
4092 | eb = radix_tree_lookup(&tree->buffer, start >> PAGE_CACHE_SHIFT); | |
4093 | if (eb && atomic_inc_not_zero(&eb->refs)) { | |
4094 | rcu_read_unlock(); | |
5df4235e | 4095 | mark_extent_buffer_accessed(eb); |
6af118ce CM |
4096 | return eb; |
4097 | } | |
19fe0a8b | 4098 | rcu_read_unlock(); |
6af118ce | 4099 | |
ba144192 | 4100 | eb = __alloc_extent_buffer(tree, start, len, GFP_NOFS); |
2b114d1d | 4101 | if (!eb) |
d1310b2e CM |
4102 | return NULL; |
4103 | ||
727011e0 | 4104 | for (i = 0; i < num_pages; i++, index++) { |
a6591715 | 4105 | p = find_or_create_page(mapping, index, GFP_NOFS); |
d1310b2e CM |
4106 | if (!p) { |
4107 | WARN_ON(1); | |
6af118ce | 4108 | goto free_eb; |
d1310b2e | 4109 | } |
4f2de97a JB |
4110 | |
4111 | spin_lock(&mapping->private_lock); | |
4112 | if (PagePrivate(p)) { | |
4113 | /* | |
4114 | * We could have already allocated an eb for this page | |
4115 | * and attached one so lets see if we can get a ref on | |
4116 | * the existing eb, and if we can we know it's good and | |
4117 | * we can just return that one, else we know we can just | |
4118 | * overwrite page->private. | |
4119 | */ | |
4120 | exists = (struct extent_buffer *)p->private; | |
4121 | if (atomic_inc_not_zero(&exists->refs)) { | |
4122 | spin_unlock(&mapping->private_lock); | |
4123 | unlock_page(p); | |
17de39ac | 4124 | page_cache_release(p); |
5df4235e | 4125 | mark_extent_buffer_accessed(exists); |
4f2de97a JB |
4126 | goto free_eb; |
4127 | } | |
4128 | ||
0b32f4bb | 4129 | /* |
4f2de97a JB |
4130 | * Do this so attach doesn't complain and we need to |
4131 | * drop the ref the old guy had. | |
4132 | */ | |
4133 | ClearPagePrivate(p); | |
0b32f4bb | 4134 | WARN_ON(PageDirty(p)); |
4f2de97a | 4135 | page_cache_release(p); |
d1310b2e | 4136 | } |
4f2de97a JB |
4137 | attach_extent_buffer_page(eb, p); |
4138 | spin_unlock(&mapping->private_lock); | |
0b32f4bb | 4139 | WARN_ON(PageDirty(p)); |
d1310b2e | 4140 | mark_page_accessed(p); |
727011e0 | 4141 | eb->pages[i] = p; |
d1310b2e CM |
4142 | if (!PageUptodate(p)) |
4143 | uptodate = 0; | |
eb14ab8e CM |
4144 | |
4145 | /* | |
4146 | * see below about how we avoid a nasty race with release page | |
4147 | * and why we unlock later | |
4148 | */ | |
d1310b2e CM |
4149 | } |
4150 | if (uptodate) | |
b4ce94de | 4151 | set_bit(EXTENT_BUFFER_UPTODATE, &eb->bflags); |
115391d2 | 4152 | again: |
19fe0a8b MX |
4153 | ret = radix_tree_preload(GFP_NOFS & ~__GFP_HIGHMEM); |
4154 | if (ret) | |
4155 | goto free_eb; | |
4156 | ||
6af118ce | 4157 | spin_lock(&tree->buffer_lock); |
19fe0a8b MX |
4158 | ret = radix_tree_insert(&tree->buffer, start >> PAGE_CACHE_SHIFT, eb); |
4159 | if (ret == -EEXIST) { | |
4160 | exists = radix_tree_lookup(&tree->buffer, | |
4161 | start >> PAGE_CACHE_SHIFT); | |
115391d2 JB |
4162 | if (!atomic_inc_not_zero(&exists->refs)) { |
4163 | spin_unlock(&tree->buffer_lock); | |
4164 | radix_tree_preload_end(); | |
115391d2 JB |
4165 | exists = NULL; |
4166 | goto again; | |
4167 | } | |
6af118ce | 4168 | spin_unlock(&tree->buffer_lock); |
19fe0a8b | 4169 | radix_tree_preload_end(); |
5df4235e | 4170 | mark_extent_buffer_accessed(exists); |
6af118ce CM |
4171 | goto free_eb; |
4172 | } | |
6af118ce | 4173 | /* add one reference for the tree */ |
3083ee2e | 4174 | spin_lock(&eb->refs_lock); |
0b32f4bb | 4175 | check_buffer_tree_ref(eb); |
3083ee2e | 4176 | spin_unlock(&eb->refs_lock); |
f044ba78 | 4177 | spin_unlock(&tree->buffer_lock); |
19fe0a8b | 4178 | radix_tree_preload_end(); |
eb14ab8e CM |
4179 | |
4180 | /* | |
4181 | * there is a race where release page may have | |
4182 | * tried to find this extent buffer in the radix | |
4183 | * but failed. It will tell the VM it is safe to | |
4184 | * reclaim the, and it will clear the page private bit. | |
4185 | * We must make sure to set the page private bit properly | |
4186 | * after the extent buffer is in the radix tree so | |
4187 | * it doesn't get lost | |
4188 | */ | |
727011e0 CM |
4189 | SetPageChecked(eb->pages[0]); |
4190 | for (i = 1; i < num_pages; i++) { | |
4191 | p = extent_buffer_page(eb, i); | |
727011e0 CM |
4192 | ClearPageChecked(p); |
4193 | unlock_page(p); | |
4194 | } | |
4195 | unlock_page(eb->pages[0]); | |
d1310b2e CM |
4196 | return eb; |
4197 | ||
6af118ce | 4198 | free_eb: |
727011e0 CM |
4199 | for (i = 0; i < num_pages; i++) { |
4200 | if (eb->pages[i]) | |
4201 | unlock_page(eb->pages[i]); | |
4202 | } | |
eb14ab8e | 4203 | |
17de39ac | 4204 | WARN_ON(!atomic_dec_and_test(&eb->refs)); |
897ca6e9 | 4205 | btrfs_release_extent_buffer(eb); |
6af118ce | 4206 | return exists; |
d1310b2e | 4207 | } |
d1310b2e CM |
4208 | |
4209 | struct extent_buffer *find_extent_buffer(struct extent_io_tree *tree, | |
f09d1f60 | 4210 | u64 start, unsigned long len) |
d1310b2e | 4211 | { |
d1310b2e | 4212 | struct extent_buffer *eb; |
d1310b2e | 4213 | |
19fe0a8b MX |
4214 | rcu_read_lock(); |
4215 | eb = radix_tree_lookup(&tree->buffer, start >> PAGE_CACHE_SHIFT); | |
4216 | if (eb && atomic_inc_not_zero(&eb->refs)) { | |
4217 | rcu_read_unlock(); | |
5df4235e | 4218 | mark_extent_buffer_accessed(eb); |
19fe0a8b MX |
4219 | return eb; |
4220 | } | |
4221 | rcu_read_unlock(); | |
0f9dd46c | 4222 | |
19fe0a8b | 4223 | return NULL; |
d1310b2e | 4224 | } |
d1310b2e | 4225 | |
3083ee2e JB |
4226 | static inline void btrfs_release_extent_buffer_rcu(struct rcu_head *head) |
4227 | { | |
4228 | struct extent_buffer *eb = | |
4229 | container_of(head, struct extent_buffer, rcu_head); | |
4230 | ||
4231 | __free_extent_buffer(eb); | |
4232 | } | |
4233 | ||
3083ee2e JB |
4234 | /* Expects to have eb->eb_lock already held */ |
4235 | static void release_extent_buffer(struct extent_buffer *eb, gfp_t mask) | |
4236 | { | |
4237 | WARN_ON(atomic_read(&eb->refs) == 0); | |
4238 | if (atomic_dec_and_test(&eb->refs)) { | |
4239 | struct extent_io_tree *tree = eb->tree; | |
3083ee2e JB |
4240 | |
4241 | spin_unlock(&eb->refs_lock); | |
4242 | ||
3083ee2e JB |
4243 | spin_lock(&tree->buffer_lock); |
4244 | radix_tree_delete(&tree->buffer, | |
4245 | eb->start >> PAGE_CACHE_SHIFT); | |
4246 | spin_unlock(&tree->buffer_lock); | |
4247 | ||
4248 | /* Should be safe to release our pages at this point */ | |
4249 | btrfs_release_extent_buffer_page(eb, 0); | |
4250 | ||
4251 | call_rcu(&eb->rcu_head, btrfs_release_extent_buffer_rcu); | |
4252 | return; | |
4253 | } | |
4254 | spin_unlock(&eb->refs_lock); | |
4255 | } | |
4256 | ||
d1310b2e CM |
4257 | void free_extent_buffer(struct extent_buffer *eb) |
4258 | { | |
d1310b2e CM |
4259 | if (!eb) |
4260 | return; | |
4261 | ||
3083ee2e JB |
4262 | spin_lock(&eb->refs_lock); |
4263 | if (atomic_read(&eb->refs) == 2 && | |
4264 | test_bit(EXTENT_BUFFER_STALE, &eb->bflags) && | |
0b32f4bb | 4265 | !extent_buffer_under_io(eb) && |
3083ee2e JB |
4266 | test_and_clear_bit(EXTENT_BUFFER_TREE_REF, &eb->bflags)) |
4267 | atomic_dec(&eb->refs); | |
4268 | ||
4269 | /* | |
4270 | * I know this is terrible, but it's temporary until we stop tracking | |
4271 | * the uptodate bits and such for the extent buffers. | |
4272 | */ | |
4273 | release_extent_buffer(eb, GFP_ATOMIC); | |
4274 | } | |
4275 | ||
4276 | void free_extent_buffer_stale(struct extent_buffer *eb) | |
4277 | { | |
4278 | if (!eb) | |
d1310b2e CM |
4279 | return; |
4280 | ||
3083ee2e JB |
4281 | spin_lock(&eb->refs_lock); |
4282 | set_bit(EXTENT_BUFFER_STALE, &eb->bflags); | |
4283 | ||
0b32f4bb | 4284 | if (atomic_read(&eb->refs) == 2 && !extent_buffer_under_io(eb) && |
3083ee2e JB |
4285 | test_and_clear_bit(EXTENT_BUFFER_TREE_REF, &eb->bflags)) |
4286 | atomic_dec(&eb->refs); | |
4287 | release_extent_buffer(eb, GFP_NOFS); | |
d1310b2e | 4288 | } |
d1310b2e | 4289 | |
1d4284bd | 4290 | void clear_extent_buffer_dirty(struct extent_buffer *eb) |
d1310b2e | 4291 | { |
d1310b2e CM |
4292 | unsigned long i; |
4293 | unsigned long num_pages; | |
4294 | struct page *page; | |
4295 | ||
d1310b2e CM |
4296 | num_pages = num_extent_pages(eb->start, eb->len); |
4297 | ||
4298 | for (i = 0; i < num_pages; i++) { | |
4299 | page = extent_buffer_page(eb, i); | |
b9473439 | 4300 | if (!PageDirty(page)) |
d2c3f4f6 CM |
4301 | continue; |
4302 | ||
a61e6f29 | 4303 | lock_page(page); |
eb14ab8e CM |
4304 | WARN_ON(!PagePrivate(page)); |
4305 | ||
d1310b2e | 4306 | clear_page_dirty_for_io(page); |
0ee0fda0 | 4307 | spin_lock_irq(&page->mapping->tree_lock); |
d1310b2e CM |
4308 | if (!PageDirty(page)) { |
4309 | radix_tree_tag_clear(&page->mapping->page_tree, | |
4310 | page_index(page), | |
4311 | PAGECACHE_TAG_DIRTY); | |
4312 | } | |
0ee0fda0 | 4313 | spin_unlock_irq(&page->mapping->tree_lock); |
bf0da8c1 | 4314 | ClearPageError(page); |
a61e6f29 | 4315 | unlock_page(page); |
d1310b2e | 4316 | } |
0b32f4bb | 4317 | WARN_ON(atomic_read(&eb->refs) == 0); |
d1310b2e | 4318 | } |
d1310b2e | 4319 | |
0b32f4bb | 4320 | int set_extent_buffer_dirty(struct extent_buffer *eb) |
d1310b2e CM |
4321 | { |
4322 | unsigned long i; | |
4323 | unsigned long num_pages; | |
b9473439 | 4324 | int was_dirty = 0; |
d1310b2e | 4325 | |
0b32f4bb JB |
4326 | check_buffer_tree_ref(eb); |
4327 | ||
b9473439 | 4328 | was_dirty = test_and_set_bit(EXTENT_BUFFER_DIRTY, &eb->bflags); |
0b32f4bb | 4329 | |
d1310b2e | 4330 | num_pages = num_extent_pages(eb->start, eb->len); |
3083ee2e | 4331 | WARN_ON(atomic_read(&eb->refs) == 0); |
0b32f4bb JB |
4332 | WARN_ON(!test_bit(EXTENT_BUFFER_TREE_REF, &eb->bflags)); |
4333 | ||
b9473439 | 4334 | for (i = 0; i < num_pages; i++) |
0b32f4bb | 4335 | set_page_dirty(extent_buffer_page(eb, i)); |
b9473439 | 4336 | return was_dirty; |
d1310b2e | 4337 | } |
d1310b2e | 4338 | |
0b32f4bb | 4339 | static int range_straddles_pages(u64 start, u64 len) |
19b6caf4 CM |
4340 | { |
4341 | if (len < PAGE_CACHE_SIZE) | |
4342 | return 1; | |
4343 | if (start & (PAGE_CACHE_SIZE - 1)) | |
4344 | return 1; | |
4345 | if ((start + len) & (PAGE_CACHE_SIZE - 1)) | |
4346 | return 1; | |
4347 | return 0; | |
4348 | } | |
4349 | ||
0b32f4bb | 4350 | int clear_extent_buffer_uptodate(struct extent_buffer *eb) |
1259ab75 CM |
4351 | { |
4352 | unsigned long i; | |
4353 | struct page *page; | |
4354 | unsigned long num_pages; | |
4355 | ||
b4ce94de | 4356 | clear_bit(EXTENT_BUFFER_UPTODATE, &eb->bflags); |
0b32f4bb | 4357 | num_pages = num_extent_pages(eb->start, eb->len); |
1259ab75 CM |
4358 | for (i = 0; i < num_pages; i++) { |
4359 | page = extent_buffer_page(eb, i); | |
33958dc6 CM |
4360 | if (page) |
4361 | ClearPageUptodate(page); | |
1259ab75 CM |
4362 | } |
4363 | return 0; | |
4364 | } | |
4365 | ||
0b32f4bb | 4366 | int set_extent_buffer_uptodate(struct extent_buffer *eb) |
d1310b2e CM |
4367 | { |
4368 | unsigned long i; | |
4369 | struct page *page; | |
4370 | unsigned long num_pages; | |
4371 | ||
0b32f4bb | 4372 | set_bit(EXTENT_BUFFER_UPTODATE, &eb->bflags); |
d1310b2e | 4373 | num_pages = num_extent_pages(eb->start, eb->len); |
d1310b2e CM |
4374 | for (i = 0; i < num_pages; i++) { |
4375 | page = extent_buffer_page(eb, i); | |
d1310b2e CM |
4376 | SetPageUptodate(page); |
4377 | } | |
4378 | return 0; | |
4379 | } | |
d1310b2e | 4380 | |
ce9adaa5 CM |
4381 | int extent_range_uptodate(struct extent_io_tree *tree, |
4382 | u64 start, u64 end) | |
4383 | { | |
4384 | struct page *page; | |
4385 | int ret; | |
4386 | int pg_uptodate = 1; | |
4387 | int uptodate; | |
4388 | unsigned long index; | |
4389 | ||
0b32f4bb | 4390 | if (range_straddles_pages(start, end - start + 1)) { |
19b6caf4 CM |
4391 | ret = test_range_bit(tree, start, end, |
4392 | EXTENT_UPTODATE, 1, NULL); | |
4393 | if (ret) | |
4394 | return 1; | |
4395 | } | |
d397712b | 4396 | while (start <= end) { |
ce9adaa5 CM |
4397 | index = start >> PAGE_CACHE_SHIFT; |
4398 | page = find_get_page(tree->mapping, index); | |
8bedd51b MH |
4399 | if (!page) |
4400 | return 1; | |
ce9adaa5 CM |
4401 | uptodate = PageUptodate(page); |
4402 | page_cache_release(page); | |
4403 | if (!uptodate) { | |
4404 | pg_uptodate = 0; | |
4405 | break; | |
4406 | } | |
4407 | start += PAGE_CACHE_SIZE; | |
4408 | } | |
4409 | return pg_uptodate; | |
4410 | } | |
4411 | ||
0b32f4bb | 4412 | int extent_buffer_uptodate(struct extent_buffer *eb) |
d1310b2e | 4413 | { |
0b32f4bb | 4414 | return test_bit(EXTENT_BUFFER_UPTODATE, &eb->bflags); |
d1310b2e | 4415 | } |
d1310b2e CM |
4416 | |
4417 | int read_extent_buffer_pages(struct extent_io_tree *tree, | |
bb82ab88 | 4418 | struct extent_buffer *eb, u64 start, int wait, |
f188591e | 4419 | get_extent_t *get_extent, int mirror_num) |
d1310b2e CM |
4420 | { |
4421 | unsigned long i; | |
4422 | unsigned long start_i; | |
4423 | struct page *page; | |
4424 | int err; | |
4425 | int ret = 0; | |
ce9adaa5 CM |
4426 | int locked_pages = 0; |
4427 | int all_uptodate = 1; | |
d1310b2e | 4428 | unsigned long num_pages; |
727011e0 | 4429 | unsigned long num_reads = 0; |
a86c12c7 | 4430 | struct bio *bio = NULL; |
c8b97818 | 4431 | unsigned long bio_flags = 0; |
a86c12c7 | 4432 | |
b4ce94de | 4433 | if (test_bit(EXTENT_BUFFER_UPTODATE, &eb->bflags)) |
d1310b2e CM |
4434 | return 0; |
4435 | ||
d1310b2e CM |
4436 | if (start) { |
4437 | WARN_ON(start < eb->start); | |
4438 | start_i = (start >> PAGE_CACHE_SHIFT) - | |
4439 | (eb->start >> PAGE_CACHE_SHIFT); | |
4440 | } else { | |
4441 | start_i = 0; | |
4442 | } | |
4443 | ||
4444 | num_pages = num_extent_pages(eb->start, eb->len); | |
4445 | for (i = start_i; i < num_pages; i++) { | |
4446 | page = extent_buffer_page(eb, i); | |
bb82ab88 | 4447 | if (wait == WAIT_NONE) { |
2db04966 | 4448 | if (!trylock_page(page)) |
ce9adaa5 | 4449 | goto unlock_exit; |
d1310b2e CM |
4450 | } else { |
4451 | lock_page(page); | |
4452 | } | |
ce9adaa5 | 4453 | locked_pages++; |
727011e0 CM |
4454 | if (!PageUptodate(page)) { |
4455 | num_reads++; | |
ce9adaa5 | 4456 | all_uptodate = 0; |
727011e0 | 4457 | } |
ce9adaa5 CM |
4458 | } |
4459 | if (all_uptodate) { | |
4460 | if (start_i == 0) | |
b4ce94de | 4461 | set_bit(EXTENT_BUFFER_UPTODATE, &eb->bflags); |
ce9adaa5 CM |
4462 | goto unlock_exit; |
4463 | } | |
4464 | ||
ea466794 | 4465 | clear_bit(EXTENT_BUFFER_IOERR, &eb->bflags); |
5cf1ab56 | 4466 | eb->read_mirror = 0; |
0b32f4bb | 4467 | atomic_set(&eb->io_pages, num_reads); |
ce9adaa5 CM |
4468 | for (i = start_i; i < num_pages; i++) { |
4469 | page = extent_buffer_page(eb, i); | |
ce9adaa5 | 4470 | if (!PageUptodate(page)) { |
f188591e | 4471 | ClearPageError(page); |
a86c12c7 | 4472 | err = __extent_read_full_page(tree, page, |
f188591e | 4473 | get_extent, &bio, |
c8b97818 | 4474 | mirror_num, &bio_flags); |
d397712b | 4475 | if (err) |
d1310b2e | 4476 | ret = err; |
d1310b2e CM |
4477 | } else { |
4478 | unlock_page(page); | |
4479 | } | |
4480 | } | |
4481 | ||
355808c2 JM |
4482 | if (bio) { |
4483 | err = submit_one_bio(READ, bio, mirror_num, bio_flags); | |
79787eaa JM |
4484 | if (err) |
4485 | return err; | |
355808c2 | 4486 | } |
a86c12c7 | 4487 | |
bb82ab88 | 4488 | if (ret || wait != WAIT_COMPLETE) |
d1310b2e | 4489 | return ret; |
d397712b | 4490 | |
d1310b2e CM |
4491 | for (i = start_i; i < num_pages; i++) { |
4492 | page = extent_buffer_page(eb, i); | |
4493 | wait_on_page_locked(page); | |
d397712b | 4494 | if (!PageUptodate(page)) |
d1310b2e | 4495 | ret = -EIO; |
d1310b2e | 4496 | } |
d397712b | 4497 | |
d1310b2e | 4498 | return ret; |
ce9adaa5 CM |
4499 | |
4500 | unlock_exit: | |
4501 | i = start_i; | |
d397712b | 4502 | while (locked_pages > 0) { |
ce9adaa5 CM |
4503 | page = extent_buffer_page(eb, i); |
4504 | i++; | |
4505 | unlock_page(page); | |
4506 | locked_pages--; | |
4507 | } | |
4508 | return ret; | |
d1310b2e | 4509 | } |
d1310b2e CM |
4510 | |
4511 | void read_extent_buffer(struct extent_buffer *eb, void *dstv, | |
4512 | unsigned long start, | |
4513 | unsigned long len) | |
4514 | { | |
4515 | size_t cur; | |
4516 | size_t offset; | |
4517 | struct page *page; | |
4518 | char *kaddr; | |
4519 | char *dst = (char *)dstv; | |
4520 | size_t start_offset = eb->start & ((u64)PAGE_CACHE_SIZE - 1); | |
4521 | unsigned long i = (start_offset + start) >> PAGE_CACHE_SHIFT; | |
d1310b2e CM |
4522 | |
4523 | WARN_ON(start > eb->len); | |
4524 | WARN_ON(start + len > eb->start + eb->len); | |
4525 | ||
4526 | offset = (start_offset + start) & ((unsigned long)PAGE_CACHE_SIZE - 1); | |
4527 | ||
d397712b | 4528 | while (len > 0) { |
d1310b2e | 4529 | page = extent_buffer_page(eb, i); |
d1310b2e CM |
4530 | |
4531 | cur = min(len, (PAGE_CACHE_SIZE - offset)); | |
a6591715 | 4532 | kaddr = page_address(page); |
d1310b2e | 4533 | memcpy(dst, kaddr + offset, cur); |
d1310b2e CM |
4534 | |
4535 | dst += cur; | |
4536 | len -= cur; | |
4537 | offset = 0; | |
4538 | i++; | |
4539 | } | |
4540 | } | |
d1310b2e CM |
4541 | |
4542 | int map_private_extent_buffer(struct extent_buffer *eb, unsigned long start, | |
a6591715 | 4543 | unsigned long min_len, char **map, |
d1310b2e | 4544 | unsigned long *map_start, |
a6591715 | 4545 | unsigned long *map_len) |
d1310b2e CM |
4546 | { |
4547 | size_t offset = start & (PAGE_CACHE_SIZE - 1); | |
4548 | char *kaddr; | |
4549 | struct page *p; | |
4550 | size_t start_offset = eb->start & ((u64)PAGE_CACHE_SIZE - 1); | |
4551 | unsigned long i = (start_offset + start) >> PAGE_CACHE_SHIFT; | |
4552 | unsigned long end_i = (start_offset + start + min_len - 1) >> | |
4553 | PAGE_CACHE_SHIFT; | |
4554 | ||
4555 | if (i != end_i) | |
4556 | return -EINVAL; | |
4557 | ||
4558 | if (i == 0) { | |
4559 | offset = start_offset; | |
4560 | *map_start = 0; | |
4561 | } else { | |
4562 | offset = 0; | |
4563 | *map_start = ((u64)i << PAGE_CACHE_SHIFT) - start_offset; | |
4564 | } | |
d397712b | 4565 | |
d1310b2e | 4566 | if (start + min_len > eb->len) { |
d397712b CM |
4567 | printk(KERN_ERR "btrfs bad mapping eb start %llu len %lu, " |
4568 | "wanted %lu %lu\n", (unsigned long long)eb->start, | |
4569 | eb->len, start, min_len); | |
d1310b2e | 4570 | WARN_ON(1); |
85026533 | 4571 | return -EINVAL; |
d1310b2e CM |
4572 | } |
4573 | ||
4574 | p = extent_buffer_page(eb, i); | |
a6591715 | 4575 | kaddr = page_address(p); |
d1310b2e CM |
4576 | *map = kaddr + offset; |
4577 | *map_len = PAGE_CACHE_SIZE - offset; | |
4578 | return 0; | |
4579 | } | |
d1310b2e | 4580 | |
d1310b2e CM |
4581 | int memcmp_extent_buffer(struct extent_buffer *eb, const void *ptrv, |
4582 | unsigned long start, | |
4583 | unsigned long len) | |
4584 | { | |
4585 | size_t cur; | |
4586 | size_t offset; | |
4587 | struct page *page; | |
4588 | char *kaddr; | |
4589 | char *ptr = (char *)ptrv; | |
4590 | size_t start_offset = eb->start & ((u64)PAGE_CACHE_SIZE - 1); | |
4591 | unsigned long i = (start_offset + start) >> PAGE_CACHE_SHIFT; | |
4592 | int ret = 0; | |
4593 | ||
4594 | WARN_ON(start > eb->len); | |
4595 | WARN_ON(start + len > eb->start + eb->len); | |
4596 | ||
4597 | offset = (start_offset + start) & ((unsigned long)PAGE_CACHE_SIZE - 1); | |
4598 | ||
d397712b | 4599 | while (len > 0) { |
d1310b2e | 4600 | page = extent_buffer_page(eb, i); |
d1310b2e CM |
4601 | |
4602 | cur = min(len, (PAGE_CACHE_SIZE - offset)); | |
4603 | ||
a6591715 | 4604 | kaddr = page_address(page); |
d1310b2e | 4605 | ret = memcmp(ptr, kaddr + offset, cur); |
d1310b2e CM |
4606 | if (ret) |
4607 | break; | |
4608 | ||
4609 | ptr += cur; | |
4610 | len -= cur; | |
4611 | offset = 0; | |
4612 | i++; | |
4613 | } | |
4614 | return ret; | |
4615 | } | |
d1310b2e CM |
4616 | |
4617 | void write_extent_buffer(struct extent_buffer *eb, const void *srcv, | |
4618 | unsigned long start, unsigned long len) | |
4619 | { | |
4620 | size_t cur; | |
4621 | size_t offset; | |
4622 | struct page *page; | |
4623 | char *kaddr; | |
4624 | char *src = (char *)srcv; | |
4625 | size_t start_offset = eb->start & ((u64)PAGE_CACHE_SIZE - 1); | |
4626 | unsigned long i = (start_offset + start) >> PAGE_CACHE_SHIFT; | |
4627 | ||
4628 | WARN_ON(start > eb->len); | |
4629 | WARN_ON(start + len > eb->start + eb->len); | |
4630 | ||
4631 | offset = (start_offset + start) & ((unsigned long)PAGE_CACHE_SIZE - 1); | |
4632 | ||
d397712b | 4633 | while (len > 0) { |
d1310b2e CM |
4634 | page = extent_buffer_page(eb, i); |
4635 | WARN_ON(!PageUptodate(page)); | |
4636 | ||
4637 | cur = min(len, PAGE_CACHE_SIZE - offset); | |
a6591715 | 4638 | kaddr = page_address(page); |
d1310b2e | 4639 | memcpy(kaddr + offset, src, cur); |
d1310b2e CM |
4640 | |
4641 | src += cur; | |
4642 | len -= cur; | |
4643 | offset = 0; | |
4644 | i++; | |
4645 | } | |
4646 | } | |
d1310b2e CM |
4647 | |
4648 | void memset_extent_buffer(struct extent_buffer *eb, char c, | |
4649 | unsigned long start, unsigned long len) | |
4650 | { | |
4651 | size_t cur; | |
4652 | size_t offset; | |
4653 | struct page *page; | |
4654 | char *kaddr; | |
4655 | size_t start_offset = eb->start & ((u64)PAGE_CACHE_SIZE - 1); | |
4656 | unsigned long i = (start_offset + start) >> PAGE_CACHE_SHIFT; | |
4657 | ||
4658 | WARN_ON(start > eb->len); | |
4659 | WARN_ON(start + len > eb->start + eb->len); | |
4660 | ||
4661 | offset = (start_offset + start) & ((unsigned long)PAGE_CACHE_SIZE - 1); | |
4662 | ||
d397712b | 4663 | while (len > 0) { |
d1310b2e CM |
4664 | page = extent_buffer_page(eb, i); |
4665 | WARN_ON(!PageUptodate(page)); | |
4666 | ||
4667 | cur = min(len, PAGE_CACHE_SIZE - offset); | |
a6591715 | 4668 | kaddr = page_address(page); |
d1310b2e | 4669 | memset(kaddr + offset, c, cur); |
d1310b2e CM |
4670 | |
4671 | len -= cur; | |
4672 | offset = 0; | |
4673 | i++; | |
4674 | } | |
4675 | } | |
d1310b2e CM |
4676 | |
4677 | void copy_extent_buffer(struct extent_buffer *dst, struct extent_buffer *src, | |
4678 | unsigned long dst_offset, unsigned long src_offset, | |
4679 | unsigned long len) | |
4680 | { | |
4681 | u64 dst_len = dst->len; | |
4682 | size_t cur; | |
4683 | size_t offset; | |
4684 | struct page *page; | |
4685 | char *kaddr; | |
4686 | size_t start_offset = dst->start & ((u64)PAGE_CACHE_SIZE - 1); | |
4687 | unsigned long i = (start_offset + dst_offset) >> PAGE_CACHE_SHIFT; | |
4688 | ||
4689 | WARN_ON(src->len != dst_len); | |
4690 | ||
4691 | offset = (start_offset + dst_offset) & | |
4692 | ((unsigned long)PAGE_CACHE_SIZE - 1); | |
4693 | ||
d397712b | 4694 | while (len > 0) { |
d1310b2e CM |
4695 | page = extent_buffer_page(dst, i); |
4696 | WARN_ON(!PageUptodate(page)); | |
4697 | ||
4698 | cur = min(len, (unsigned long)(PAGE_CACHE_SIZE - offset)); | |
4699 | ||
a6591715 | 4700 | kaddr = page_address(page); |
d1310b2e | 4701 | read_extent_buffer(src, kaddr + offset, src_offset, cur); |
d1310b2e CM |
4702 | |
4703 | src_offset += cur; | |
4704 | len -= cur; | |
4705 | offset = 0; | |
4706 | i++; | |
4707 | } | |
4708 | } | |
d1310b2e CM |
4709 | |
4710 | static void move_pages(struct page *dst_page, struct page *src_page, | |
4711 | unsigned long dst_off, unsigned long src_off, | |
4712 | unsigned long len) | |
4713 | { | |
a6591715 | 4714 | char *dst_kaddr = page_address(dst_page); |
d1310b2e CM |
4715 | if (dst_page == src_page) { |
4716 | memmove(dst_kaddr + dst_off, dst_kaddr + src_off, len); | |
4717 | } else { | |
a6591715 | 4718 | char *src_kaddr = page_address(src_page); |
d1310b2e CM |
4719 | char *p = dst_kaddr + dst_off + len; |
4720 | char *s = src_kaddr + src_off + len; | |
4721 | ||
4722 | while (len--) | |
4723 | *--p = *--s; | |
d1310b2e | 4724 | } |
d1310b2e CM |
4725 | } |
4726 | ||
3387206f ST |
4727 | static inline bool areas_overlap(unsigned long src, unsigned long dst, unsigned long len) |
4728 | { | |
4729 | unsigned long distance = (src > dst) ? src - dst : dst - src; | |
4730 | return distance < len; | |
4731 | } | |
4732 | ||
d1310b2e CM |
4733 | static void copy_pages(struct page *dst_page, struct page *src_page, |
4734 | unsigned long dst_off, unsigned long src_off, | |
4735 | unsigned long len) | |
4736 | { | |
a6591715 | 4737 | char *dst_kaddr = page_address(dst_page); |
d1310b2e | 4738 | char *src_kaddr; |
727011e0 | 4739 | int must_memmove = 0; |
d1310b2e | 4740 | |
3387206f | 4741 | if (dst_page != src_page) { |
a6591715 | 4742 | src_kaddr = page_address(src_page); |
3387206f | 4743 | } else { |
d1310b2e | 4744 | src_kaddr = dst_kaddr; |
727011e0 CM |
4745 | if (areas_overlap(src_off, dst_off, len)) |
4746 | must_memmove = 1; | |
3387206f | 4747 | } |
d1310b2e | 4748 | |
727011e0 CM |
4749 | if (must_memmove) |
4750 | memmove(dst_kaddr + dst_off, src_kaddr + src_off, len); | |
4751 | else | |
4752 | memcpy(dst_kaddr + dst_off, src_kaddr + src_off, len); | |
d1310b2e CM |
4753 | } |
4754 | ||
4755 | void memcpy_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset, | |
4756 | unsigned long src_offset, unsigned long len) | |
4757 | { | |
4758 | size_t cur; | |
4759 | size_t dst_off_in_page; | |
4760 | size_t src_off_in_page; | |
4761 | size_t start_offset = dst->start & ((u64)PAGE_CACHE_SIZE - 1); | |
4762 | unsigned long dst_i; | |
4763 | unsigned long src_i; | |
4764 | ||
4765 | if (src_offset + len > dst->len) { | |
d397712b CM |
4766 | printk(KERN_ERR "btrfs memmove bogus src_offset %lu move " |
4767 | "len %lu dst len %lu\n", src_offset, len, dst->len); | |
d1310b2e CM |
4768 | BUG_ON(1); |
4769 | } | |
4770 | if (dst_offset + len > dst->len) { | |
d397712b CM |
4771 | printk(KERN_ERR "btrfs memmove bogus dst_offset %lu move " |
4772 | "len %lu dst len %lu\n", dst_offset, len, dst->len); | |
d1310b2e CM |
4773 | BUG_ON(1); |
4774 | } | |
4775 | ||
d397712b | 4776 | while (len > 0) { |
d1310b2e CM |
4777 | dst_off_in_page = (start_offset + dst_offset) & |
4778 | ((unsigned long)PAGE_CACHE_SIZE - 1); | |
4779 | src_off_in_page = (start_offset + src_offset) & | |
4780 | ((unsigned long)PAGE_CACHE_SIZE - 1); | |
4781 | ||
4782 | dst_i = (start_offset + dst_offset) >> PAGE_CACHE_SHIFT; | |
4783 | src_i = (start_offset + src_offset) >> PAGE_CACHE_SHIFT; | |
4784 | ||
4785 | cur = min(len, (unsigned long)(PAGE_CACHE_SIZE - | |
4786 | src_off_in_page)); | |
4787 | cur = min_t(unsigned long, cur, | |
4788 | (unsigned long)(PAGE_CACHE_SIZE - dst_off_in_page)); | |
4789 | ||
4790 | copy_pages(extent_buffer_page(dst, dst_i), | |
4791 | extent_buffer_page(dst, src_i), | |
4792 | dst_off_in_page, src_off_in_page, cur); | |
4793 | ||
4794 | src_offset += cur; | |
4795 | dst_offset += cur; | |
4796 | len -= cur; | |
4797 | } | |
4798 | } | |
d1310b2e CM |
4799 | |
4800 | void memmove_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset, | |
4801 | unsigned long src_offset, unsigned long len) | |
4802 | { | |
4803 | size_t cur; | |
4804 | size_t dst_off_in_page; | |
4805 | size_t src_off_in_page; | |
4806 | unsigned long dst_end = dst_offset + len - 1; | |
4807 | unsigned long src_end = src_offset + len - 1; | |
4808 | size_t start_offset = dst->start & ((u64)PAGE_CACHE_SIZE - 1); | |
4809 | unsigned long dst_i; | |
4810 | unsigned long src_i; | |
4811 | ||
4812 | if (src_offset + len > dst->len) { | |
d397712b CM |
4813 | printk(KERN_ERR "btrfs memmove bogus src_offset %lu move " |
4814 | "len %lu len %lu\n", src_offset, len, dst->len); | |
d1310b2e CM |
4815 | BUG_ON(1); |
4816 | } | |
4817 | if (dst_offset + len > dst->len) { | |
d397712b CM |
4818 | printk(KERN_ERR "btrfs memmove bogus dst_offset %lu move " |
4819 | "len %lu len %lu\n", dst_offset, len, dst->len); | |
d1310b2e CM |
4820 | BUG_ON(1); |
4821 | } | |
727011e0 | 4822 | if (dst_offset < src_offset) { |
d1310b2e CM |
4823 | memcpy_extent_buffer(dst, dst_offset, src_offset, len); |
4824 | return; | |
4825 | } | |
d397712b | 4826 | while (len > 0) { |
d1310b2e CM |
4827 | dst_i = (start_offset + dst_end) >> PAGE_CACHE_SHIFT; |
4828 | src_i = (start_offset + src_end) >> PAGE_CACHE_SHIFT; | |
4829 | ||
4830 | dst_off_in_page = (start_offset + dst_end) & | |
4831 | ((unsigned long)PAGE_CACHE_SIZE - 1); | |
4832 | src_off_in_page = (start_offset + src_end) & | |
4833 | ((unsigned long)PAGE_CACHE_SIZE - 1); | |
4834 | ||
4835 | cur = min_t(unsigned long, len, src_off_in_page + 1); | |
4836 | cur = min(cur, dst_off_in_page + 1); | |
4837 | move_pages(extent_buffer_page(dst, dst_i), | |
4838 | extent_buffer_page(dst, src_i), | |
4839 | dst_off_in_page - cur + 1, | |
4840 | src_off_in_page - cur + 1, cur); | |
4841 | ||
4842 | dst_end -= cur; | |
4843 | src_end -= cur; | |
4844 | len -= cur; | |
4845 | } | |
4846 | } | |
6af118ce | 4847 | |
3083ee2e | 4848 | int try_release_extent_buffer(struct page *page, gfp_t mask) |
19fe0a8b | 4849 | { |
6af118ce | 4850 | struct extent_buffer *eb; |
6af118ce | 4851 | |
3083ee2e JB |
4852 | /* |
4853 | * We need to make sure noboody is attaching this page to an eb right | |
4854 | * now. | |
4855 | */ | |
4856 | spin_lock(&page->mapping->private_lock); | |
4857 | if (!PagePrivate(page)) { | |
4858 | spin_unlock(&page->mapping->private_lock); | |
4f2de97a | 4859 | return 1; |
45f49bce | 4860 | } |
6af118ce | 4861 | |
3083ee2e JB |
4862 | eb = (struct extent_buffer *)page->private; |
4863 | BUG_ON(!eb); | |
19fe0a8b MX |
4864 | |
4865 | /* | |
3083ee2e JB |
4866 | * This is a little awful but should be ok, we need to make sure that |
4867 | * the eb doesn't disappear out from under us while we're looking at | |
4868 | * this page. | |
19fe0a8b | 4869 | */ |
3083ee2e | 4870 | spin_lock(&eb->refs_lock); |
0b32f4bb | 4871 | if (atomic_read(&eb->refs) != 1 || extent_buffer_under_io(eb)) { |
3083ee2e JB |
4872 | spin_unlock(&eb->refs_lock); |
4873 | spin_unlock(&page->mapping->private_lock); | |
4874 | return 0; | |
b9473439 | 4875 | } |
3083ee2e | 4876 | spin_unlock(&page->mapping->private_lock); |
897ca6e9 | 4877 | |
3083ee2e JB |
4878 | if ((mask & GFP_NOFS) == GFP_NOFS) |
4879 | mask = GFP_NOFS; | |
19fe0a8b | 4880 | |
19fe0a8b | 4881 | /* |
3083ee2e JB |
4882 | * If tree ref isn't set then we know the ref on this eb is a real ref, |
4883 | * so just return, this page will likely be freed soon anyway. | |
19fe0a8b | 4884 | */ |
3083ee2e JB |
4885 | if (!test_and_clear_bit(EXTENT_BUFFER_TREE_REF, &eb->bflags)) { |
4886 | spin_unlock(&eb->refs_lock); | |
4887 | return 0; | |
b9473439 | 4888 | } |
3083ee2e | 4889 | release_extent_buffer(eb, mask); |
19fe0a8b | 4890 | |
3083ee2e | 4891 | return 1; |
6af118ce | 4892 | } |