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dc17ff8f CM |
1 | /* |
2 | * Copyright (C) 2007 Oracle. All rights reserved. | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or | |
5 | * modify it under the terms of the GNU General Public | |
6 | * License v2 as published by the Free Software Foundation. | |
7 | * | |
8 | * This program is distributed in the hope that it will be useful, | |
9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
11 | * General Public License for more details. | |
12 | * | |
13 | * You should have received a copy of the GNU General Public | |
14 | * License along with this program; if not, write to the | |
15 | * Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
16 | * Boston, MA 021110-1307, USA. | |
17 | */ | |
18 | ||
dc17ff8f | 19 | #include <linux/slab.h> |
d6bfde87 | 20 | #include <linux/blkdev.h> |
f421950f CM |
21 | #include <linux/writeback.h> |
22 | #include <linux/pagevec.h> | |
dc17ff8f CM |
23 | #include "ctree.h" |
24 | #include "transaction.h" | |
25 | #include "btrfs_inode.h" | |
e6dcd2dc | 26 | #include "extent_io.h" |
199c2a9c | 27 | #include "disk-io.h" |
dc17ff8f | 28 | |
6352b91d MX |
29 | static struct kmem_cache *btrfs_ordered_extent_cache; |
30 | ||
e6dcd2dc | 31 | static u64 entry_end(struct btrfs_ordered_extent *entry) |
dc17ff8f | 32 | { |
e6dcd2dc CM |
33 | if (entry->file_offset + entry->len < entry->file_offset) |
34 | return (u64)-1; | |
35 | return entry->file_offset + entry->len; | |
dc17ff8f CM |
36 | } |
37 | ||
d352ac68 CM |
38 | /* returns NULL if the insertion worked, or it returns the node it did find |
39 | * in the tree | |
40 | */ | |
e6dcd2dc CM |
41 | static struct rb_node *tree_insert(struct rb_root *root, u64 file_offset, |
42 | struct rb_node *node) | |
dc17ff8f | 43 | { |
d397712b CM |
44 | struct rb_node **p = &root->rb_node; |
45 | struct rb_node *parent = NULL; | |
e6dcd2dc | 46 | struct btrfs_ordered_extent *entry; |
dc17ff8f | 47 | |
d397712b | 48 | while (*p) { |
dc17ff8f | 49 | parent = *p; |
e6dcd2dc | 50 | entry = rb_entry(parent, struct btrfs_ordered_extent, rb_node); |
dc17ff8f | 51 | |
e6dcd2dc | 52 | if (file_offset < entry->file_offset) |
dc17ff8f | 53 | p = &(*p)->rb_left; |
e6dcd2dc | 54 | else if (file_offset >= entry_end(entry)) |
dc17ff8f CM |
55 | p = &(*p)->rb_right; |
56 | else | |
57 | return parent; | |
58 | } | |
59 | ||
60 | rb_link_node(node, parent, p); | |
61 | rb_insert_color(node, root); | |
62 | return NULL; | |
63 | } | |
64 | ||
43c04fb1 JM |
65 | static void ordered_data_tree_panic(struct inode *inode, int errno, |
66 | u64 offset) | |
67 | { | |
68 | struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); | |
69 | btrfs_panic(fs_info, errno, "Inconsistency in ordered tree at offset " | |
351fd353 | 70 | "%llu", offset); |
43c04fb1 JM |
71 | } |
72 | ||
d352ac68 CM |
73 | /* |
74 | * look for a given offset in the tree, and if it can't be found return the | |
75 | * first lesser offset | |
76 | */ | |
e6dcd2dc CM |
77 | static struct rb_node *__tree_search(struct rb_root *root, u64 file_offset, |
78 | struct rb_node **prev_ret) | |
dc17ff8f | 79 | { |
d397712b | 80 | struct rb_node *n = root->rb_node; |
dc17ff8f | 81 | struct rb_node *prev = NULL; |
e6dcd2dc CM |
82 | struct rb_node *test; |
83 | struct btrfs_ordered_extent *entry; | |
84 | struct btrfs_ordered_extent *prev_entry = NULL; | |
dc17ff8f | 85 | |
d397712b | 86 | while (n) { |
e6dcd2dc | 87 | entry = rb_entry(n, struct btrfs_ordered_extent, rb_node); |
dc17ff8f CM |
88 | prev = n; |
89 | prev_entry = entry; | |
dc17ff8f | 90 | |
e6dcd2dc | 91 | if (file_offset < entry->file_offset) |
dc17ff8f | 92 | n = n->rb_left; |
e6dcd2dc | 93 | else if (file_offset >= entry_end(entry)) |
dc17ff8f CM |
94 | n = n->rb_right; |
95 | else | |
96 | return n; | |
97 | } | |
98 | if (!prev_ret) | |
99 | return NULL; | |
100 | ||
d397712b | 101 | while (prev && file_offset >= entry_end(prev_entry)) { |
e6dcd2dc CM |
102 | test = rb_next(prev); |
103 | if (!test) | |
104 | break; | |
105 | prev_entry = rb_entry(test, struct btrfs_ordered_extent, | |
106 | rb_node); | |
107 | if (file_offset < entry_end(prev_entry)) | |
108 | break; | |
109 | ||
110 | prev = test; | |
111 | } | |
112 | if (prev) | |
113 | prev_entry = rb_entry(prev, struct btrfs_ordered_extent, | |
114 | rb_node); | |
d397712b | 115 | while (prev && file_offset < entry_end(prev_entry)) { |
e6dcd2dc CM |
116 | test = rb_prev(prev); |
117 | if (!test) | |
118 | break; | |
119 | prev_entry = rb_entry(test, struct btrfs_ordered_extent, | |
120 | rb_node); | |
121 | prev = test; | |
dc17ff8f CM |
122 | } |
123 | *prev_ret = prev; | |
124 | return NULL; | |
125 | } | |
126 | ||
d352ac68 CM |
127 | /* |
128 | * helper to check if a given offset is inside a given entry | |
129 | */ | |
e6dcd2dc CM |
130 | static int offset_in_entry(struct btrfs_ordered_extent *entry, u64 file_offset) |
131 | { | |
132 | if (file_offset < entry->file_offset || | |
133 | entry->file_offset + entry->len <= file_offset) | |
134 | return 0; | |
135 | return 1; | |
136 | } | |
137 | ||
4b46fce2 JB |
138 | static int range_overlaps(struct btrfs_ordered_extent *entry, u64 file_offset, |
139 | u64 len) | |
140 | { | |
141 | if (file_offset + len <= entry->file_offset || | |
142 | entry->file_offset + entry->len <= file_offset) | |
143 | return 0; | |
144 | return 1; | |
145 | } | |
146 | ||
d352ac68 CM |
147 | /* |
148 | * look find the first ordered struct that has this offset, otherwise | |
149 | * the first one less than this offset | |
150 | */ | |
e6dcd2dc CM |
151 | static inline struct rb_node *tree_search(struct btrfs_ordered_inode_tree *tree, |
152 | u64 file_offset) | |
dc17ff8f | 153 | { |
e6dcd2dc | 154 | struct rb_root *root = &tree->tree; |
c87fb6fd | 155 | struct rb_node *prev = NULL; |
dc17ff8f | 156 | struct rb_node *ret; |
e6dcd2dc CM |
157 | struct btrfs_ordered_extent *entry; |
158 | ||
159 | if (tree->last) { | |
160 | entry = rb_entry(tree->last, struct btrfs_ordered_extent, | |
161 | rb_node); | |
162 | if (offset_in_entry(entry, file_offset)) | |
163 | return tree->last; | |
164 | } | |
165 | ret = __tree_search(root, file_offset, &prev); | |
dc17ff8f | 166 | if (!ret) |
e6dcd2dc CM |
167 | ret = prev; |
168 | if (ret) | |
169 | tree->last = ret; | |
dc17ff8f CM |
170 | return ret; |
171 | } | |
172 | ||
eb84ae03 CM |
173 | /* allocate and add a new ordered_extent into the per-inode tree. |
174 | * file_offset is the logical offset in the file | |
175 | * | |
176 | * start is the disk block number of an extent already reserved in the | |
177 | * extent allocation tree | |
178 | * | |
179 | * len is the length of the extent | |
180 | * | |
eb84ae03 CM |
181 | * The tree is given a single reference on the ordered extent that was |
182 | * inserted. | |
183 | */ | |
4b46fce2 JB |
184 | static int __btrfs_add_ordered_extent(struct inode *inode, u64 file_offset, |
185 | u64 start, u64 len, u64 disk_len, | |
261507a0 | 186 | int type, int dio, int compress_type) |
dc17ff8f | 187 | { |
199c2a9c | 188 | struct btrfs_root *root = BTRFS_I(inode)->root; |
dc17ff8f | 189 | struct btrfs_ordered_inode_tree *tree; |
e6dcd2dc CM |
190 | struct rb_node *node; |
191 | struct btrfs_ordered_extent *entry; | |
dc17ff8f | 192 | |
e6dcd2dc | 193 | tree = &BTRFS_I(inode)->ordered_tree; |
6352b91d | 194 | entry = kmem_cache_zalloc(btrfs_ordered_extent_cache, GFP_NOFS); |
dc17ff8f CM |
195 | if (!entry) |
196 | return -ENOMEM; | |
197 | ||
e6dcd2dc CM |
198 | entry->file_offset = file_offset; |
199 | entry->start = start; | |
200 | entry->len = len; | |
2ab28f32 JB |
201 | if (!(BTRFS_I(inode)->flags & BTRFS_INODE_NODATASUM) && |
202 | !(type == BTRFS_ORDERED_NOCOW)) | |
203 | entry->csum_bytes_left = disk_len; | |
c8b97818 | 204 | entry->disk_len = disk_len; |
8b62b72b | 205 | entry->bytes_left = len; |
5fd02043 | 206 | entry->inode = igrab(inode); |
261507a0 | 207 | entry->compress_type = compress_type; |
77cef2ec | 208 | entry->truncated_len = (u64)-1; |
d899e052 | 209 | if (type != BTRFS_ORDERED_IO_DONE && type != BTRFS_ORDERED_COMPLETE) |
80ff3856 | 210 | set_bit(type, &entry->flags); |
3eaa2885 | 211 | |
4b46fce2 JB |
212 | if (dio) |
213 | set_bit(BTRFS_ORDERED_DIRECT, &entry->flags); | |
214 | ||
e6dcd2dc CM |
215 | /* one ref for the tree */ |
216 | atomic_set(&entry->refs, 1); | |
217 | init_waitqueue_head(&entry->wait); | |
218 | INIT_LIST_HEAD(&entry->list); | |
3eaa2885 | 219 | INIT_LIST_HEAD(&entry->root_extent_list); |
9afab882 MX |
220 | INIT_LIST_HEAD(&entry->work_list); |
221 | init_completion(&entry->completion); | |
2ab28f32 | 222 | INIT_LIST_HEAD(&entry->log_list); |
50d9aa99 | 223 | INIT_LIST_HEAD(&entry->trans_list); |
dc17ff8f | 224 | |
1abe9b8a | 225 | trace_btrfs_ordered_extent_add(inode, entry); |
226 | ||
5fd02043 | 227 | spin_lock_irq(&tree->lock); |
e6dcd2dc CM |
228 | node = tree_insert(&tree->tree, file_offset, |
229 | &entry->rb_node); | |
43c04fb1 JM |
230 | if (node) |
231 | ordered_data_tree_panic(inode, -EEXIST, file_offset); | |
5fd02043 | 232 | spin_unlock_irq(&tree->lock); |
d397712b | 233 | |
199c2a9c | 234 | spin_lock(&root->ordered_extent_lock); |
3eaa2885 | 235 | list_add_tail(&entry->root_extent_list, |
199c2a9c MX |
236 | &root->ordered_extents); |
237 | root->nr_ordered_extents++; | |
238 | if (root->nr_ordered_extents == 1) { | |
239 | spin_lock(&root->fs_info->ordered_root_lock); | |
240 | BUG_ON(!list_empty(&root->ordered_root)); | |
241 | list_add_tail(&root->ordered_root, | |
242 | &root->fs_info->ordered_roots); | |
243 | spin_unlock(&root->fs_info->ordered_root_lock); | |
244 | } | |
245 | spin_unlock(&root->ordered_extent_lock); | |
3eaa2885 | 246 | |
dc17ff8f CM |
247 | return 0; |
248 | } | |
249 | ||
4b46fce2 JB |
250 | int btrfs_add_ordered_extent(struct inode *inode, u64 file_offset, |
251 | u64 start, u64 len, u64 disk_len, int type) | |
252 | { | |
253 | return __btrfs_add_ordered_extent(inode, file_offset, start, len, | |
261507a0 LZ |
254 | disk_len, type, 0, |
255 | BTRFS_COMPRESS_NONE); | |
4b46fce2 JB |
256 | } |
257 | ||
258 | int btrfs_add_ordered_extent_dio(struct inode *inode, u64 file_offset, | |
259 | u64 start, u64 len, u64 disk_len, int type) | |
260 | { | |
261 | return __btrfs_add_ordered_extent(inode, file_offset, start, len, | |
261507a0 LZ |
262 | disk_len, type, 1, |
263 | BTRFS_COMPRESS_NONE); | |
264 | } | |
265 | ||
266 | int btrfs_add_ordered_extent_compress(struct inode *inode, u64 file_offset, | |
267 | u64 start, u64 len, u64 disk_len, | |
268 | int type, int compress_type) | |
269 | { | |
270 | return __btrfs_add_ordered_extent(inode, file_offset, start, len, | |
271 | disk_len, type, 0, | |
272 | compress_type); | |
4b46fce2 JB |
273 | } |
274 | ||
eb84ae03 CM |
275 | /* |
276 | * Add a struct btrfs_ordered_sum into the list of checksums to be inserted | |
3edf7d33 CM |
277 | * when an ordered extent is finished. If the list covers more than one |
278 | * ordered extent, it is split across multiples. | |
eb84ae03 | 279 | */ |
143bede5 JM |
280 | void btrfs_add_ordered_sum(struct inode *inode, |
281 | struct btrfs_ordered_extent *entry, | |
282 | struct btrfs_ordered_sum *sum) | |
dc17ff8f | 283 | { |
e6dcd2dc | 284 | struct btrfs_ordered_inode_tree *tree; |
dc17ff8f | 285 | |
e6dcd2dc | 286 | tree = &BTRFS_I(inode)->ordered_tree; |
5fd02043 | 287 | spin_lock_irq(&tree->lock); |
e6dcd2dc | 288 | list_add_tail(&sum->list, &entry->list); |
2ab28f32 JB |
289 | WARN_ON(entry->csum_bytes_left < sum->len); |
290 | entry->csum_bytes_left -= sum->len; | |
291 | if (entry->csum_bytes_left == 0) | |
292 | wake_up(&entry->wait); | |
5fd02043 | 293 | spin_unlock_irq(&tree->lock); |
dc17ff8f CM |
294 | } |
295 | ||
163cf09c CM |
296 | /* |
297 | * this is used to account for finished IO across a given range | |
298 | * of the file. The IO may span ordered extents. If | |
299 | * a given ordered_extent is completely done, 1 is returned, otherwise | |
300 | * 0. | |
301 | * | |
302 | * test_and_set_bit on a flag in the struct btrfs_ordered_extent is used | |
303 | * to make sure this function only returns 1 once for a given ordered extent. | |
304 | * | |
305 | * file_offset is updated to one byte past the range that is recorded as | |
306 | * complete. This allows you to walk forward in the file. | |
307 | */ | |
308 | int btrfs_dec_test_first_ordered_pending(struct inode *inode, | |
309 | struct btrfs_ordered_extent **cached, | |
5fd02043 | 310 | u64 *file_offset, u64 io_size, int uptodate) |
163cf09c CM |
311 | { |
312 | struct btrfs_ordered_inode_tree *tree; | |
313 | struct rb_node *node; | |
314 | struct btrfs_ordered_extent *entry = NULL; | |
315 | int ret; | |
5fd02043 | 316 | unsigned long flags; |
163cf09c CM |
317 | u64 dec_end; |
318 | u64 dec_start; | |
319 | u64 to_dec; | |
320 | ||
321 | tree = &BTRFS_I(inode)->ordered_tree; | |
5fd02043 | 322 | spin_lock_irqsave(&tree->lock, flags); |
163cf09c CM |
323 | node = tree_search(tree, *file_offset); |
324 | if (!node) { | |
325 | ret = 1; | |
326 | goto out; | |
327 | } | |
328 | ||
329 | entry = rb_entry(node, struct btrfs_ordered_extent, rb_node); | |
330 | if (!offset_in_entry(entry, *file_offset)) { | |
331 | ret = 1; | |
332 | goto out; | |
333 | } | |
334 | ||
335 | dec_start = max(*file_offset, entry->file_offset); | |
336 | dec_end = min(*file_offset + io_size, entry->file_offset + | |
337 | entry->len); | |
338 | *file_offset = dec_end; | |
339 | if (dec_start > dec_end) { | |
efe120a0 FH |
340 | btrfs_crit(BTRFS_I(inode)->root->fs_info, |
341 | "bad ordering dec_start %llu end %llu", dec_start, dec_end); | |
163cf09c CM |
342 | } |
343 | to_dec = dec_end - dec_start; | |
344 | if (to_dec > entry->bytes_left) { | |
efe120a0 FH |
345 | btrfs_crit(BTRFS_I(inode)->root->fs_info, |
346 | "bad ordered accounting left %llu size %llu", | |
347 | entry->bytes_left, to_dec); | |
163cf09c CM |
348 | } |
349 | entry->bytes_left -= to_dec; | |
5fd02043 JB |
350 | if (!uptodate) |
351 | set_bit(BTRFS_ORDERED_IOERR, &entry->flags); | |
352 | ||
af7a6509 | 353 | if (entry->bytes_left == 0) { |
163cf09c | 354 | ret = test_and_set_bit(BTRFS_ORDERED_IO_DONE, &entry->flags); |
af7a6509 MX |
355 | if (waitqueue_active(&entry->wait)) |
356 | wake_up(&entry->wait); | |
357 | } else { | |
163cf09c | 358 | ret = 1; |
af7a6509 | 359 | } |
163cf09c CM |
360 | out: |
361 | if (!ret && cached && entry) { | |
362 | *cached = entry; | |
363 | atomic_inc(&entry->refs); | |
364 | } | |
5fd02043 | 365 | spin_unlock_irqrestore(&tree->lock, flags); |
163cf09c CM |
366 | return ret == 0; |
367 | } | |
368 | ||
eb84ae03 CM |
369 | /* |
370 | * this is used to account for finished IO across a given range | |
371 | * of the file. The IO should not span ordered extents. If | |
372 | * a given ordered_extent is completely done, 1 is returned, otherwise | |
373 | * 0. | |
374 | * | |
375 | * test_and_set_bit on a flag in the struct btrfs_ordered_extent is used | |
376 | * to make sure this function only returns 1 once for a given ordered extent. | |
377 | */ | |
e6dcd2dc | 378 | int btrfs_dec_test_ordered_pending(struct inode *inode, |
5a1a3df1 | 379 | struct btrfs_ordered_extent **cached, |
5fd02043 | 380 | u64 file_offset, u64 io_size, int uptodate) |
dc17ff8f | 381 | { |
e6dcd2dc | 382 | struct btrfs_ordered_inode_tree *tree; |
dc17ff8f | 383 | struct rb_node *node; |
5a1a3df1 | 384 | struct btrfs_ordered_extent *entry = NULL; |
5fd02043 | 385 | unsigned long flags; |
e6dcd2dc CM |
386 | int ret; |
387 | ||
388 | tree = &BTRFS_I(inode)->ordered_tree; | |
5fd02043 JB |
389 | spin_lock_irqsave(&tree->lock, flags); |
390 | if (cached && *cached) { | |
391 | entry = *cached; | |
392 | goto have_entry; | |
393 | } | |
394 | ||
e6dcd2dc | 395 | node = tree_search(tree, file_offset); |
dc17ff8f | 396 | if (!node) { |
e6dcd2dc CM |
397 | ret = 1; |
398 | goto out; | |
dc17ff8f CM |
399 | } |
400 | ||
e6dcd2dc | 401 | entry = rb_entry(node, struct btrfs_ordered_extent, rb_node); |
5fd02043 | 402 | have_entry: |
e6dcd2dc CM |
403 | if (!offset_in_entry(entry, file_offset)) { |
404 | ret = 1; | |
405 | goto out; | |
dc17ff8f | 406 | } |
e6dcd2dc | 407 | |
8b62b72b | 408 | if (io_size > entry->bytes_left) { |
efe120a0 FH |
409 | btrfs_crit(BTRFS_I(inode)->root->fs_info, |
410 | "bad ordered accounting left %llu size %llu", | |
c1c9ff7c | 411 | entry->bytes_left, io_size); |
8b62b72b CM |
412 | } |
413 | entry->bytes_left -= io_size; | |
5fd02043 JB |
414 | if (!uptodate) |
415 | set_bit(BTRFS_ORDERED_IOERR, &entry->flags); | |
416 | ||
af7a6509 | 417 | if (entry->bytes_left == 0) { |
e6dcd2dc | 418 | ret = test_and_set_bit(BTRFS_ORDERED_IO_DONE, &entry->flags); |
af7a6509 MX |
419 | if (waitqueue_active(&entry->wait)) |
420 | wake_up(&entry->wait); | |
421 | } else { | |
8b62b72b | 422 | ret = 1; |
af7a6509 | 423 | } |
e6dcd2dc | 424 | out: |
5a1a3df1 JB |
425 | if (!ret && cached && entry) { |
426 | *cached = entry; | |
427 | atomic_inc(&entry->refs); | |
428 | } | |
5fd02043 | 429 | spin_unlock_irqrestore(&tree->lock, flags); |
e6dcd2dc CM |
430 | return ret == 0; |
431 | } | |
dc17ff8f | 432 | |
2ab28f32 | 433 | /* Needs to either be called under a log transaction or the log_mutex */ |
827463c4 MX |
434 | void btrfs_get_logged_extents(struct inode *inode, |
435 | struct list_head *logged_list) | |
2ab28f32 JB |
436 | { |
437 | struct btrfs_ordered_inode_tree *tree; | |
438 | struct btrfs_ordered_extent *ordered; | |
439 | struct rb_node *n; | |
2ab28f32 JB |
440 | |
441 | tree = &BTRFS_I(inode)->ordered_tree; | |
442 | spin_lock_irq(&tree->lock); | |
443 | for (n = rb_first(&tree->tree); n; n = rb_next(n)) { | |
444 | ordered = rb_entry(n, struct btrfs_ordered_extent, rb_node); | |
827463c4 MX |
445 | if (!list_empty(&ordered->log_list)) |
446 | continue; | |
50d9aa99 JB |
447 | if (test_bit(BTRFS_ORDERED_LOGGED, &ordered->flags)) |
448 | continue; | |
827463c4 MX |
449 | list_add_tail(&ordered->log_list, logged_list); |
450 | atomic_inc(&ordered->refs); | |
2ab28f32 JB |
451 | } |
452 | spin_unlock_irq(&tree->lock); | |
453 | } | |
454 | ||
827463c4 MX |
455 | void btrfs_put_logged_extents(struct list_head *logged_list) |
456 | { | |
457 | struct btrfs_ordered_extent *ordered; | |
458 | ||
459 | while (!list_empty(logged_list)) { | |
460 | ordered = list_first_entry(logged_list, | |
461 | struct btrfs_ordered_extent, | |
462 | log_list); | |
463 | list_del_init(&ordered->log_list); | |
464 | btrfs_put_ordered_extent(ordered); | |
465 | } | |
466 | } | |
467 | ||
468 | void btrfs_submit_logged_extents(struct list_head *logged_list, | |
469 | struct btrfs_root *log) | |
470 | { | |
471 | int index = log->log_transid % 2; | |
472 | ||
473 | spin_lock_irq(&log->log_extents_lock[index]); | |
474 | list_splice_tail(logged_list, &log->logged_list[index]); | |
475 | spin_unlock_irq(&log->log_extents_lock[index]); | |
476 | } | |
477 | ||
50d9aa99 JB |
478 | void btrfs_wait_logged_extents(struct btrfs_trans_handle *trans, |
479 | struct btrfs_root *log, u64 transid) | |
2ab28f32 JB |
480 | { |
481 | struct btrfs_ordered_extent *ordered; | |
482 | int index = transid % 2; | |
483 | ||
484 | spin_lock_irq(&log->log_extents_lock[index]); | |
485 | while (!list_empty(&log->logged_list[index])) { | |
486 | ordered = list_first_entry(&log->logged_list[index], | |
487 | struct btrfs_ordered_extent, | |
488 | log_list); | |
489 | list_del_init(&ordered->log_list); | |
490 | spin_unlock_irq(&log->log_extents_lock[index]); | |
98ce2ded LB |
491 | |
492 | if (!test_bit(BTRFS_ORDERED_IO_DONE, &ordered->flags) && | |
493 | !test_bit(BTRFS_ORDERED_DIRECT, &ordered->flags)) { | |
494 | struct inode *inode = ordered->inode; | |
495 | u64 start = ordered->file_offset; | |
496 | u64 end = ordered->file_offset + ordered->len - 1; | |
497 | ||
498 | WARN_ON(!inode); | |
499 | filemap_fdatawrite_range(inode->i_mapping, start, end); | |
500 | } | |
2ab28f32 JB |
501 | wait_event(ordered->wait, test_bit(BTRFS_ORDERED_IO_DONE, |
502 | &ordered->flags)); | |
98ce2ded | 503 | |
50d9aa99 JB |
504 | if (!test_and_set_bit(BTRFS_ORDERED_LOGGED, &ordered->flags)) |
505 | list_add_tail(&ordered->trans_list, &trans->ordered); | |
2ab28f32 JB |
506 | spin_lock_irq(&log->log_extents_lock[index]); |
507 | } | |
508 | spin_unlock_irq(&log->log_extents_lock[index]); | |
509 | } | |
510 | ||
511 | void btrfs_free_logged_extents(struct btrfs_root *log, u64 transid) | |
512 | { | |
513 | struct btrfs_ordered_extent *ordered; | |
514 | int index = transid % 2; | |
515 | ||
516 | spin_lock_irq(&log->log_extents_lock[index]); | |
517 | while (!list_empty(&log->logged_list[index])) { | |
518 | ordered = list_first_entry(&log->logged_list[index], | |
519 | struct btrfs_ordered_extent, | |
520 | log_list); | |
521 | list_del_init(&ordered->log_list); | |
522 | spin_unlock_irq(&log->log_extents_lock[index]); | |
523 | btrfs_put_ordered_extent(ordered); | |
524 | spin_lock_irq(&log->log_extents_lock[index]); | |
525 | } | |
526 | spin_unlock_irq(&log->log_extents_lock[index]); | |
527 | } | |
528 | ||
eb84ae03 CM |
529 | /* |
530 | * used to drop a reference on an ordered extent. This will free | |
531 | * the extent if the last reference is dropped | |
532 | */ | |
143bede5 | 533 | void btrfs_put_ordered_extent(struct btrfs_ordered_extent *entry) |
e6dcd2dc | 534 | { |
ba1da2f4 CM |
535 | struct list_head *cur; |
536 | struct btrfs_ordered_sum *sum; | |
537 | ||
1abe9b8a | 538 | trace_btrfs_ordered_extent_put(entry->inode, entry); |
539 | ||
ba1da2f4 | 540 | if (atomic_dec_and_test(&entry->refs)) { |
5fd02043 JB |
541 | if (entry->inode) |
542 | btrfs_add_delayed_iput(entry->inode); | |
d397712b | 543 | while (!list_empty(&entry->list)) { |
ba1da2f4 CM |
544 | cur = entry->list.next; |
545 | sum = list_entry(cur, struct btrfs_ordered_sum, list); | |
546 | list_del(&sum->list); | |
547 | kfree(sum); | |
548 | } | |
6352b91d | 549 | kmem_cache_free(btrfs_ordered_extent_cache, entry); |
ba1da2f4 | 550 | } |
dc17ff8f | 551 | } |
cee36a03 | 552 | |
eb84ae03 CM |
553 | /* |
554 | * remove an ordered extent from the tree. No references are dropped | |
5fd02043 | 555 | * and waiters are woken up. |
eb84ae03 | 556 | */ |
5fd02043 JB |
557 | void btrfs_remove_ordered_extent(struct inode *inode, |
558 | struct btrfs_ordered_extent *entry) | |
cee36a03 | 559 | { |
e6dcd2dc | 560 | struct btrfs_ordered_inode_tree *tree; |
287a0ab9 | 561 | struct btrfs_root *root = BTRFS_I(inode)->root; |
cee36a03 | 562 | struct rb_node *node; |
cee36a03 | 563 | |
e6dcd2dc | 564 | tree = &BTRFS_I(inode)->ordered_tree; |
5fd02043 | 565 | spin_lock_irq(&tree->lock); |
e6dcd2dc | 566 | node = &entry->rb_node; |
cee36a03 | 567 | rb_erase(node, &tree->tree); |
1b8e7e45 FDBM |
568 | if (tree->last == node) |
569 | tree->last = NULL; | |
e6dcd2dc | 570 | set_bit(BTRFS_ORDERED_COMPLETE, &entry->flags); |
5fd02043 | 571 | spin_unlock_irq(&tree->lock); |
3eaa2885 | 572 | |
199c2a9c | 573 | spin_lock(&root->ordered_extent_lock); |
3eaa2885 | 574 | list_del_init(&entry->root_extent_list); |
199c2a9c | 575 | root->nr_ordered_extents--; |
5a3f23d5 | 576 | |
1abe9b8a | 577 | trace_btrfs_ordered_extent_remove(inode, entry); |
578 | ||
199c2a9c MX |
579 | if (!root->nr_ordered_extents) { |
580 | spin_lock(&root->fs_info->ordered_root_lock); | |
581 | BUG_ON(list_empty(&root->ordered_root)); | |
582 | list_del_init(&root->ordered_root); | |
583 | spin_unlock(&root->fs_info->ordered_root_lock); | |
584 | } | |
585 | spin_unlock(&root->ordered_extent_lock); | |
e6dcd2dc | 586 | wake_up(&entry->wait); |
cee36a03 CM |
587 | } |
588 | ||
d458b054 | 589 | static void btrfs_run_ordered_extent_work(struct btrfs_work *work) |
9afab882 MX |
590 | { |
591 | struct btrfs_ordered_extent *ordered; | |
592 | ||
593 | ordered = container_of(work, struct btrfs_ordered_extent, flush_work); | |
594 | btrfs_start_ordered_extent(ordered->inode, ordered, 1); | |
595 | complete(&ordered->completion); | |
596 | } | |
597 | ||
d352ac68 CM |
598 | /* |
599 | * wait for all the ordered extents in a root. This is done when balancing | |
600 | * space between drives. | |
601 | */ | |
31f3d255 | 602 | int btrfs_wait_ordered_extents(struct btrfs_root *root, int nr) |
3eaa2885 | 603 | { |
9afab882 | 604 | struct list_head splice, works; |
9afab882 | 605 | struct btrfs_ordered_extent *ordered, *next; |
b0244199 | 606 | int count = 0; |
3eaa2885 CM |
607 | |
608 | INIT_LIST_HEAD(&splice); | |
9afab882 | 609 | INIT_LIST_HEAD(&works); |
3eaa2885 | 610 | |
31f3d255 | 611 | mutex_lock(&root->ordered_extent_mutex); |
199c2a9c MX |
612 | spin_lock(&root->ordered_extent_lock); |
613 | list_splice_init(&root->ordered_extents, &splice); | |
b0244199 | 614 | while (!list_empty(&splice) && nr) { |
199c2a9c MX |
615 | ordered = list_first_entry(&splice, struct btrfs_ordered_extent, |
616 | root_extent_list); | |
617 | list_move_tail(&ordered->root_extent_list, | |
618 | &root->ordered_extents); | |
199c2a9c MX |
619 | atomic_inc(&ordered->refs); |
620 | spin_unlock(&root->ordered_extent_lock); | |
3eaa2885 | 621 | |
a44903ab | 622 | btrfs_init_work(&ordered->flush_work, |
9e0af237 | 623 | btrfs_flush_delalloc_helper, |
a44903ab | 624 | btrfs_run_ordered_extent_work, NULL, NULL); |
199c2a9c | 625 | list_add_tail(&ordered->work_list, &works); |
a44903ab QW |
626 | btrfs_queue_work(root->fs_info->flush_workers, |
627 | &ordered->flush_work); | |
3eaa2885 | 628 | |
9afab882 | 629 | cond_resched(); |
199c2a9c | 630 | spin_lock(&root->ordered_extent_lock); |
b0244199 MX |
631 | if (nr != -1) |
632 | nr--; | |
633 | count++; | |
3eaa2885 | 634 | } |
b0244199 | 635 | list_splice_tail(&splice, &root->ordered_extents); |
199c2a9c | 636 | spin_unlock(&root->ordered_extent_lock); |
9afab882 MX |
637 | |
638 | list_for_each_entry_safe(ordered, next, &works, work_list) { | |
639 | list_del_init(&ordered->work_list); | |
640 | wait_for_completion(&ordered->completion); | |
9afab882 | 641 | btrfs_put_ordered_extent(ordered); |
9afab882 MX |
642 | cond_resched(); |
643 | } | |
31f3d255 | 644 | mutex_unlock(&root->ordered_extent_mutex); |
b0244199 MX |
645 | |
646 | return count; | |
3eaa2885 CM |
647 | } |
648 | ||
b0244199 | 649 | void btrfs_wait_ordered_roots(struct btrfs_fs_info *fs_info, int nr) |
199c2a9c MX |
650 | { |
651 | struct btrfs_root *root; | |
652 | struct list_head splice; | |
b0244199 | 653 | int done; |
199c2a9c MX |
654 | |
655 | INIT_LIST_HEAD(&splice); | |
656 | ||
8b9d83cd | 657 | mutex_lock(&fs_info->ordered_operations_mutex); |
199c2a9c MX |
658 | spin_lock(&fs_info->ordered_root_lock); |
659 | list_splice_init(&fs_info->ordered_roots, &splice); | |
b0244199 | 660 | while (!list_empty(&splice) && nr) { |
199c2a9c MX |
661 | root = list_first_entry(&splice, struct btrfs_root, |
662 | ordered_root); | |
663 | root = btrfs_grab_fs_root(root); | |
664 | BUG_ON(!root); | |
665 | list_move_tail(&root->ordered_root, | |
666 | &fs_info->ordered_roots); | |
667 | spin_unlock(&fs_info->ordered_root_lock); | |
668 | ||
31f3d255 | 669 | done = btrfs_wait_ordered_extents(root, nr); |
199c2a9c MX |
670 | btrfs_put_fs_root(root); |
671 | ||
672 | spin_lock(&fs_info->ordered_root_lock); | |
b0244199 MX |
673 | if (nr != -1) { |
674 | nr -= done; | |
675 | WARN_ON(nr < 0); | |
676 | } | |
199c2a9c | 677 | } |
931aa877 | 678 | list_splice_tail(&splice, &fs_info->ordered_roots); |
199c2a9c | 679 | spin_unlock(&fs_info->ordered_root_lock); |
8b9d83cd | 680 | mutex_unlock(&fs_info->ordered_operations_mutex); |
199c2a9c MX |
681 | } |
682 | ||
eb84ae03 CM |
683 | /* |
684 | * Used to start IO or wait for a given ordered extent to finish. | |
685 | * | |
686 | * If wait is one, this effectively waits on page writeback for all the pages | |
687 | * in the extent, and it waits on the io completion code to insert | |
688 | * metadata into the btree corresponding to the extent | |
689 | */ | |
690 | void btrfs_start_ordered_extent(struct inode *inode, | |
691 | struct btrfs_ordered_extent *entry, | |
692 | int wait) | |
e6dcd2dc CM |
693 | { |
694 | u64 start = entry->file_offset; | |
695 | u64 end = start + entry->len - 1; | |
e1b81e67 | 696 | |
1abe9b8a | 697 | trace_btrfs_ordered_extent_start(inode, entry); |
698 | ||
eb84ae03 CM |
699 | /* |
700 | * pages in the range can be dirty, clean or writeback. We | |
701 | * start IO on any dirty ones so the wait doesn't stall waiting | |
b2570314 | 702 | * for the flusher thread to find them |
eb84ae03 | 703 | */ |
4b46fce2 JB |
704 | if (!test_bit(BTRFS_ORDERED_DIRECT, &entry->flags)) |
705 | filemap_fdatawrite_range(inode->i_mapping, start, end); | |
c8b97818 | 706 | if (wait) { |
e6dcd2dc CM |
707 | wait_event(entry->wait, test_bit(BTRFS_ORDERED_COMPLETE, |
708 | &entry->flags)); | |
c8b97818 | 709 | } |
e6dcd2dc | 710 | } |
cee36a03 | 711 | |
eb84ae03 CM |
712 | /* |
713 | * Used to wait on ordered extents across a large range of bytes. | |
714 | */ | |
0ef8b726 | 715 | int btrfs_wait_ordered_range(struct inode *inode, u64 start, u64 len) |
e6dcd2dc | 716 | { |
0ef8b726 | 717 | int ret = 0; |
e6dcd2dc | 718 | u64 end; |
e5a2217e | 719 | u64 orig_end; |
e6dcd2dc | 720 | struct btrfs_ordered_extent *ordered; |
e5a2217e CM |
721 | |
722 | if (start + len < start) { | |
f421950f | 723 | orig_end = INT_LIMIT(loff_t); |
e5a2217e CM |
724 | } else { |
725 | orig_end = start + len - 1; | |
f421950f CM |
726 | if (orig_end > INT_LIMIT(loff_t)) |
727 | orig_end = INT_LIMIT(loff_t); | |
e5a2217e | 728 | } |
551ebb2d | 729 | |
e5a2217e CM |
730 | /* start IO across the range first to instantiate any delalloc |
731 | * extents | |
732 | */ | |
728404da | 733 | ret = btrfs_fdatawrite_range(inode, start, orig_end); |
0ef8b726 JB |
734 | if (ret) |
735 | return ret; | |
728404da | 736 | |
0ef8b726 JB |
737 | ret = filemap_fdatawait_range(inode->i_mapping, start, orig_end); |
738 | if (ret) | |
739 | return ret; | |
e5a2217e | 740 | |
f421950f | 741 | end = orig_end; |
d397712b | 742 | while (1) { |
e6dcd2dc | 743 | ordered = btrfs_lookup_first_ordered_extent(inode, end); |
d397712b | 744 | if (!ordered) |
e6dcd2dc | 745 | break; |
e5a2217e | 746 | if (ordered->file_offset > orig_end) { |
e6dcd2dc CM |
747 | btrfs_put_ordered_extent(ordered); |
748 | break; | |
749 | } | |
b52abf1e | 750 | if (ordered->file_offset + ordered->len <= start) { |
e6dcd2dc CM |
751 | btrfs_put_ordered_extent(ordered); |
752 | break; | |
753 | } | |
e5a2217e | 754 | btrfs_start_ordered_extent(inode, ordered, 1); |
e6dcd2dc | 755 | end = ordered->file_offset; |
0ef8b726 JB |
756 | if (test_bit(BTRFS_ORDERED_IOERR, &ordered->flags)) |
757 | ret = -EIO; | |
e6dcd2dc | 758 | btrfs_put_ordered_extent(ordered); |
0ef8b726 | 759 | if (ret || end == 0 || end == start) |
e6dcd2dc CM |
760 | break; |
761 | end--; | |
762 | } | |
0ef8b726 | 763 | return ret; |
cee36a03 CM |
764 | } |
765 | ||
eb84ae03 CM |
766 | /* |
767 | * find an ordered extent corresponding to file_offset. return NULL if | |
768 | * nothing is found, otherwise take a reference on the extent and return it | |
769 | */ | |
e6dcd2dc CM |
770 | struct btrfs_ordered_extent *btrfs_lookup_ordered_extent(struct inode *inode, |
771 | u64 file_offset) | |
772 | { | |
773 | struct btrfs_ordered_inode_tree *tree; | |
774 | struct rb_node *node; | |
775 | struct btrfs_ordered_extent *entry = NULL; | |
776 | ||
777 | tree = &BTRFS_I(inode)->ordered_tree; | |
5fd02043 | 778 | spin_lock_irq(&tree->lock); |
e6dcd2dc CM |
779 | node = tree_search(tree, file_offset); |
780 | if (!node) | |
781 | goto out; | |
782 | ||
783 | entry = rb_entry(node, struct btrfs_ordered_extent, rb_node); | |
784 | if (!offset_in_entry(entry, file_offset)) | |
785 | entry = NULL; | |
786 | if (entry) | |
787 | atomic_inc(&entry->refs); | |
788 | out: | |
5fd02043 | 789 | spin_unlock_irq(&tree->lock); |
e6dcd2dc CM |
790 | return entry; |
791 | } | |
792 | ||
4b46fce2 JB |
793 | /* Since the DIO code tries to lock a wide area we need to look for any ordered |
794 | * extents that exist in the range, rather than just the start of the range. | |
795 | */ | |
796 | struct btrfs_ordered_extent *btrfs_lookup_ordered_range(struct inode *inode, | |
797 | u64 file_offset, | |
798 | u64 len) | |
799 | { | |
800 | struct btrfs_ordered_inode_tree *tree; | |
801 | struct rb_node *node; | |
802 | struct btrfs_ordered_extent *entry = NULL; | |
803 | ||
804 | tree = &BTRFS_I(inode)->ordered_tree; | |
5fd02043 | 805 | spin_lock_irq(&tree->lock); |
4b46fce2 JB |
806 | node = tree_search(tree, file_offset); |
807 | if (!node) { | |
808 | node = tree_search(tree, file_offset + len); | |
809 | if (!node) | |
810 | goto out; | |
811 | } | |
812 | ||
813 | while (1) { | |
814 | entry = rb_entry(node, struct btrfs_ordered_extent, rb_node); | |
815 | if (range_overlaps(entry, file_offset, len)) | |
816 | break; | |
817 | ||
818 | if (entry->file_offset >= file_offset + len) { | |
819 | entry = NULL; | |
820 | break; | |
821 | } | |
822 | entry = NULL; | |
823 | node = rb_next(node); | |
824 | if (!node) | |
825 | break; | |
826 | } | |
827 | out: | |
828 | if (entry) | |
829 | atomic_inc(&entry->refs); | |
5fd02043 | 830 | spin_unlock_irq(&tree->lock); |
4b46fce2 JB |
831 | return entry; |
832 | } | |
833 | ||
eb84ae03 CM |
834 | /* |
835 | * lookup and return any extent before 'file_offset'. NULL is returned | |
836 | * if none is found | |
837 | */ | |
e6dcd2dc | 838 | struct btrfs_ordered_extent * |
d397712b | 839 | btrfs_lookup_first_ordered_extent(struct inode *inode, u64 file_offset) |
e6dcd2dc CM |
840 | { |
841 | struct btrfs_ordered_inode_tree *tree; | |
842 | struct rb_node *node; | |
843 | struct btrfs_ordered_extent *entry = NULL; | |
844 | ||
845 | tree = &BTRFS_I(inode)->ordered_tree; | |
5fd02043 | 846 | spin_lock_irq(&tree->lock); |
e6dcd2dc CM |
847 | node = tree_search(tree, file_offset); |
848 | if (!node) | |
849 | goto out; | |
850 | ||
851 | entry = rb_entry(node, struct btrfs_ordered_extent, rb_node); | |
852 | atomic_inc(&entry->refs); | |
853 | out: | |
5fd02043 | 854 | spin_unlock_irq(&tree->lock); |
e6dcd2dc | 855 | return entry; |
81d7ed29 | 856 | } |
dbe674a9 | 857 | |
eb84ae03 CM |
858 | /* |
859 | * After an extent is done, call this to conditionally update the on disk | |
860 | * i_size. i_size is updated to cover any fully written part of the file. | |
861 | */ | |
c2167754 | 862 | int btrfs_ordered_update_i_size(struct inode *inode, u64 offset, |
dbe674a9 CM |
863 | struct btrfs_ordered_extent *ordered) |
864 | { | |
865 | struct btrfs_ordered_inode_tree *tree = &BTRFS_I(inode)->ordered_tree; | |
dbe674a9 CM |
866 | u64 disk_i_size; |
867 | u64 new_i_size; | |
c2167754 | 868 | u64 i_size = i_size_read(inode); |
dbe674a9 | 869 | struct rb_node *node; |
c2167754 | 870 | struct rb_node *prev = NULL; |
dbe674a9 | 871 | struct btrfs_ordered_extent *test; |
c2167754 YZ |
872 | int ret = 1; |
873 | ||
77cef2ec JB |
874 | spin_lock_irq(&tree->lock); |
875 | if (ordered) { | |
c2167754 | 876 | offset = entry_end(ordered); |
77cef2ec JB |
877 | if (test_bit(BTRFS_ORDERED_TRUNCATED, &ordered->flags)) |
878 | offset = min(offset, | |
879 | ordered->file_offset + | |
880 | ordered->truncated_len); | |
881 | } else { | |
a038fab0 | 882 | offset = ALIGN(offset, BTRFS_I(inode)->root->sectorsize); |
77cef2ec | 883 | } |
dbe674a9 CM |
884 | disk_i_size = BTRFS_I(inode)->disk_i_size; |
885 | ||
c2167754 YZ |
886 | /* truncate file */ |
887 | if (disk_i_size > i_size) { | |
888 | BTRFS_I(inode)->disk_i_size = i_size; | |
889 | ret = 0; | |
890 | goto out; | |
891 | } | |
892 | ||
dbe674a9 CM |
893 | /* |
894 | * if the disk i_size is already at the inode->i_size, or | |
895 | * this ordered extent is inside the disk i_size, we're done | |
896 | */ | |
5d1f4020 JB |
897 | if (disk_i_size == i_size) |
898 | goto out; | |
899 | ||
900 | /* | |
901 | * We still need to update disk_i_size if outstanding_isize is greater | |
902 | * than disk_i_size. | |
903 | */ | |
904 | if (offset <= disk_i_size && | |
905 | (!ordered || ordered->outstanding_isize <= disk_i_size)) | |
dbe674a9 | 906 | goto out; |
dbe674a9 | 907 | |
dbe674a9 CM |
908 | /* |
909 | * walk backward from this ordered extent to disk_i_size. | |
910 | * if we find an ordered extent then we can't update disk i_size | |
911 | * yet | |
912 | */ | |
c2167754 YZ |
913 | if (ordered) { |
914 | node = rb_prev(&ordered->rb_node); | |
915 | } else { | |
916 | prev = tree_search(tree, offset); | |
917 | /* | |
918 | * we insert file extents without involving ordered struct, | |
919 | * so there should be no ordered struct cover this offset | |
920 | */ | |
921 | if (prev) { | |
922 | test = rb_entry(prev, struct btrfs_ordered_extent, | |
923 | rb_node); | |
924 | BUG_ON(offset_in_entry(test, offset)); | |
925 | } | |
926 | node = prev; | |
927 | } | |
5fd02043 | 928 | for (; node; node = rb_prev(node)) { |
dbe674a9 | 929 | test = rb_entry(node, struct btrfs_ordered_extent, rb_node); |
5fd02043 JB |
930 | |
931 | /* We treat this entry as if it doesnt exist */ | |
932 | if (test_bit(BTRFS_ORDERED_UPDATED_ISIZE, &test->flags)) | |
933 | continue; | |
dbe674a9 CM |
934 | if (test->file_offset + test->len <= disk_i_size) |
935 | break; | |
c2167754 | 936 | if (test->file_offset >= i_size) |
dbe674a9 | 937 | break; |
59fe4f41 | 938 | if (entry_end(test) > disk_i_size) { |
b9a8cc5b MX |
939 | /* |
940 | * we don't update disk_i_size now, so record this | |
941 | * undealt i_size. Or we will not know the real | |
942 | * i_size. | |
943 | */ | |
944 | if (test->outstanding_isize < offset) | |
945 | test->outstanding_isize = offset; | |
946 | if (ordered && | |
947 | ordered->outstanding_isize > | |
948 | test->outstanding_isize) | |
949 | test->outstanding_isize = | |
950 | ordered->outstanding_isize; | |
dbe674a9 | 951 | goto out; |
5fd02043 | 952 | } |
dbe674a9 | 953 | } |
b9a8cc5b | 954 | new_i_size = min_t(u64, offset, i_size); |
dbe674a9 CM |
955 | |
956 | /* | |
b9a8cc5b MX |
957 | * Some ordered extents may completed before the current one, and |
958 | * we hold the real i_size in ->outstanding_isize. | |
dbe674a9 | 959 | */ |
b9a8cc5b MX |
960 | if (ordered && ordered->outstanding_isize > new_i_size) |
961 | new_i_size = min_t(u64, ordered->outstanding_isize, i_size); | |
dbe674a9 | 962 | BTRFS_I(inode)->disk_i_size = new_i_size; |
c2167754 | 963 | ret = 0; |
dbe674a9 | 964 | out: |
c2167754 | 965 | /* |
5fd02043 JB |
966 | * We need to do this because we can't remove ordered extents until |
967 | * after the i_disk_size has been updated and then the inode has been | |
968 | * updated to reflect the change, so we need to tell anybody who finds | |
969 | * this ordered extent that we've already done all the real work, we | |
970 | * just haven't completed all the other work. | |
c2167754 YZ |
971 | */ |
972 | if (ordered) | |
5fd02043 JB |
973 | set_bit(BTRFS_ORDERED_UPDATED_ISIZE, &ordered->flags); |
974 | spin_unlock_irq(&tree->lock); | |
c2167754 | 975 | return ret; |
dbe674a9 | 976 | } |
ba1da2f4 | 977 | |
eb84ae03 CM |
978 | /* |
979 | * search the ordered extents for one corresponding to 'offset' and | |
980 | * try to find a checksum. This is used because we allow pages to | |
981 | * be reclaimed before their checksum is actually put into the btree | |
982 | */ | |
d20f7043 | 983 | int btrfs_find_ordered_sum(struct inode *inode, u64 offset, u64 disk_bytenr, |
e4100d98 | 984 | u32 *sum, int len) |
ba1da2f4 CM |
985 | { |
986 | struct btrfs_ordered_sum *ordered_sum; | |
ba1da2f4 CM |
987 | struct btrfs_ordered_extent *ordered; |
988 | struct btrfs_ordered_inode_tree *tree = &BTRFS_I(inode)->ordered_tree; | |
3edf7d33 CM |
989 | unsigned long num_sectors; |
990 | unsigned long i; | |
991 | u32 sectorsize = BTRFS_I(inode)->root->sectorsize; | |
e4100d98 | 992 | int index = 0; |
ba1da2f4 CM |
993 | |
994 | ordered = btrfs_lookup_ordered_extent(inode, offset); | |
995 | if (!ordered) | |
e4100d98 | 996 | return 0; |
ba1da2f4 | 997 | |
5fd02043 | 998 | spin_lock_irq(&tree->lock); |
c6e30871 | 999 | list_for_each_entry_reverse(ordered_sum, &ordered->list, list) { |
e4100d98 MX |
1000 | if (disk_bytenr >= ordered_sum->bytenr && |
1001 | disk_bytenr < ordered_sum->bytenr + ordered_sum->len) { | |
1002 | i = (disk_bytenr - ordered_sum->bytenr) >> | |
1003 | inode->i_sb->s_blocksize_bits; | |
e4100d98 MX |
1004 | num_sectors = ordered_sum->len >> |
1005 | inode->i_sb->s_blocksize_bits; | |
f51a4a18 MX |
1006 | num_sectors = min_t(int, len - index, num_sectors - i); |
1007 | memcpy(sum + index, ordered_sum->sums + i, | |
1008 | num_sectors); | |
1009 | ||
1010 | index += (int)num_sectors; | |
1011 | if (index == len) | |
1012 | goto out; | |
1013 | disk_bytenr += num_sectors * sectorsize; | |
ba1da2f4 CM |
1014 | } |
1015 | } | |
1016 | out: | |
5fd02043 | 1017 | spin_unlock_irq(&tree->lock); |
89642229 | 1018 | btrfs_put_ordered_extent(ordered); |
e4100d98 | 1019 | return index; |
ba1da2f4 CM |
1020 | } |
1021 | ||
6352b91d MX |
1022 | int __init ordered_data_init(void) |
1023 | { | |
1024 | btrfs_ordered_extent_cache = kmem_cache_create("btrfs_ordered_extent", | |
1025 | sizeof(struct btrfs_ordered_extent), 0, | |
1026 | SLAB_RECLAIM_ACCOUNT | SLAB_MEM_SPREAD, | |
1027 | NULL); | |
1028 | if (!btrfs_ordered_extent_cache) | |
1029 | return -ENOMEM; | |
25287e0a | 1030 | |
6352b91d MX |
1031 | return 0; |
1032 | } | |
1033 | ||
1034 | void ordered_data_exit(void) | |
1035 | { | |
1036 | if (btrfs_ordered_extent_cache) | |
1037 | kmem_cache_destroy(btrfs_ordered_extent_cache); | |
1038 | } |