Commit | Line | Data |
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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 | 434 | void btrfs_get_logged_extents(struct inode *inode, |
0870295b FM |
435 | struct list_head *logged_list, |
436 | const loff_t start, | |
437 | const loff_t end) | |
2ab28f32 JB |
438 | { |
439 | struct btrfs_ordered_inode_tree *tree; | |
440 | struct btrfs_ordered_extent *ordered; | |
441 | struct rb_node *n; | |
0870295b | 442 | struct rb_node *prev; |
2ab28f32 JB |
443 | |
444 | tree = &BTRFS_I(inode)->ordered_tree; | |
445 | spin_lock_irq(&tree->lock); | |
0870295b FM |
446 | n = __tree_search(&tree->tree, end, &prev); |
447 | if (!n) | |
448 | n = prev; | |
449 | for (; n; n = rb_prev(n)) { | |
2ab28f32 | 450 | ordered = rb_entry(n, struct btrfs_ordered_extent, rb_node); |
0870295b FM |
451 | if (ordered->file_offset > end) |
452 | continue; | |
453 | if (entry_end(ordered) <= start) | |
454 | break; | |
4d884fce | 455 | if (test_and_set_bit(BTRFS_ORDERED_LOGGED, &ordered->flags)) |
50d9aa99 | 456 | continue; |
0870295b | 457 | list_add(&ordered->log_list, logged_list); |
827463c4 | 458 | atomic_inc(&ordered->refs); |
2ab28f32 JB |
459 | } |
460 | spin_unlock_irq(&tree->lock); | |
461 | } | |
462 | ||
827463c4 MX |
463 | void btrfs_put_logged_extents(struct list_head *logged_list) |
464 | { | |
465 | struct btrfs_ordered_extent *ordered; | |
466 | ||
467 | while (!list_empty(logged_list)) { | |
468 | ordered = list_first_entry(logged_list, | |
469 | struct btrfs_ordered_extent, | |
470 | log_list); | |
471 | list_del_init(&ordered->log_list); | |
472 | btrfs_put_ordered_extent(ordered); | |
473 | } | |
474 | } | |
475 | ||
476 | void btrfs_submit_logged_extents(struct list_head *logged_list, | |
477 | struct btrfs_root *log) | |
478 | { | |
479 | int index = log->log_transid % 2; | |
480 | ||
481 | spin_lock_irq(&log->log_extents_lock[index]); | |
482 | list_splice_tail(logged_list, &log->logged_list[index]); | |
483 | spin_unlock_irq(&log->log_extents_lock[index]); | |
484 | } | |
485 | ||
50d9aa99 JB |
486 | void btrfs_wait_logged_extents(struct btrfs_trans_handle *trans, |
487 | struct btrfs_root *log, u64 transid) | |
2ab28f32 JB |
488 | { |
489 | struct btrfs_ordered_extent *ordered; | |
490 | int index = transid % 2; | |
491 | ||
492 | spin_lock_irq(&log->log_extents_lock[index]); | |
493 | while (!list_empty(&log->logged_list[index])) { | |
494 | ordered = list_first_entry(&log->logged_list[index], | |
495 | struct btrfs_ordered_extent, | |
496 | log_list); | |
497 | list_del_init(&ordered->log_list); | |
498 | spin_unlock_irq(&log->log_extents_lock[index]); | |
98ce2ded LB |
499 | |
500 | if (!test_bit(BTRFS_ORDERED_IO_DONE, &ordered->flags) && | |
501 | !test_bit(BTRFS_ORDERED_DIRECT, &ordered->flags)) { | |
502 | struct inode *inode = ordered->inode; | |
503 | u64 start = ordered->file_offset; | |
504 | u64 end = ordered->file_offset + ordered->len - 1; | |
505 | ||
506 | WARN_ON(!inode); | |
507 | filemap_fdatawrite_range(inode->i_mapping, start, end); | |
508 | } | |
2ab28f32 JB |
509 | wait_event(ordered->wait, test_bit(BTRFS_ORDERED_IO_DONE, |
510 | &ordered->flags)); | |
98ce2ded | 511 | |
4d884fce | 512 | list_add_tail(&ordered->trans_list, &trans->ordered); |
2ab28f32 JB |
513 | spin_lock_irq(&log->log_extents_lock[index]); |
514 | } | |
515 | spin_unlock_irq(&log->log_extents_lock[index]); | |
516 | } | |
517 | ||
518 | void btrfs_free_logged_extents(struct btrfs_root *log, u64 transid) | |
519 | { | |
520 | struct btrfs_ordered_extent *ordered; | |
521 | int index = transid % 2; | |
522 | ||
523 | spin_lock_irq(&log->log_extents_lock[index]); | |
524 | while (!list_empty(&log->logged_list[index])) { | |
525 | ordered = list_first_entry(&log->logged_list[index], | |
526 | struct btrfs_ordered_extent, | |
527 | log_list); | |
528 | list_del_init(&ordered->log_list); | |
529 | spin_unlock_irq(&log->log_extents_lock[index]); | |
530 | btrfs_put_ordered_extent(ordered); | |
531 | spin_lock_irq(&log->log_extents_lock[index]); | |
532 | } | |
533 | spin_unlock_irq(&log->log_extents_lock[index]); | |
534 | } | |
535 | ||
eb84ae03 CM |
536 | /* |
537 | * used to drop a reference on an ordered extent. This will free | |
538 | * the extent if the last reference is dropped | |
539 | */ | |
143bede5 | 540 | void btrfs_put_ordered_extent(struct btrfs_ordered_extent *entry) |
e6dcd2dc | 541 | { |
ba1da2f4 CM |
542 | struct list_head *cur; |
543 | struct btrfs_ordered_sum *sum; | |
544 | ||
1abe9b8a | 545 | trace_btrfs_ordered_extent_put(entry->inode, entry); |
546 | ||
ba1da2f4 | 547 | if (atomic_dec_and_test(&entry->refs)) { |
5fd02043 JB |
548 | if (entry->inode) |
549 | btrfs_add_delayed_iput(entry->inode); | |
d397712b | 550 | while (!list_empty(&entry->list)) { |
ba1da2f4 CM |
551 | cur = entry->list.next; |
552 | sum = list_entry(cur, struct btrfs_ordered_sum, list); | |
553 | list_del(&sum->list); | |
554 | kfree(sum); | |
555 | } | |
6352b91d | 556 | kmem_cache_free(btrfs_ordered_extent_cache, entry); |
ba1da2f4 | 557 | } |
dc17ff8f | 558 | } |
cee36a03 | 559 | |
eb84ae03 CM |
560 | /* |
561 | * remove an ordered extent from the tree. No references are dropped | |
5fd02043 | 562 | * and waiters are woken up. |
eb84ae03 | 563 | */ |
5fd02043 JB |
564 | void btrfs_remove_ordered_extent(struct inode *inode, |
565 | struct btrfs_ordered_extent *entry) | |
cee36a03 | 566 | { |
e6dcd2dc | 567 | struct btrfs_ordered_inode_tree *tree; |
287a0ab9 | 568 | struct btrfs_root *root = BTRFS_I(inode)->root; |
cee36a03 | 569 | struct rb_node *node; |
cee36a03 | 570 | |
e6dcd2dc | 571 | tree = &BTRFS_I(inode)->ordered_tree; |
5fd02043 | 572 | spin_lock_irq(&tree->lock); |
e6dcd2dc | 573 | node = &entry->rb_node; |
cee36a03 | 574 | rb_erase(node, &tree->tree); |
1b8e7e45 FDBM |
575 | if (tree->last == node) |
576 | tree->last = NULL; | |
e6dcd2dc | 577 | set_bit(BTRFS_ORDERED_COMPLETE, &entry->flags); |
5fd02043 | 578 | spin_unlock_irq(&tree->lock); |
3eaa2885 | 579 | |
199c2a9c | 580 | spin_lock(&root->ordered_extent_lock); |
3eaa2885 | 581 | list_del_init(&entry->root_extent_list); |
199c2a9c | 582 | root->nr_ordered_extents--; |
5a3f23d5 | 583 | |
1abe9b8a | 584 | trace_btrfs_ordered_extent_remove(inode, entry); |
585 | ||
199c2a9c MX |
586 | if (!root->nr_ordered_extents) { |
587 | spin_lock(&root->fs_info->ordered_root_lock); | |
588 | BUG_ON(list_empty(&root->ordered_root)); | |
589 | list_del_init(&root->ordered_root); | |
590 | spin_unlock(&root->fs_info->ordered_root_lock); | |
591 | } | |
592 | spin_unlock(&root->ordered_extent_lock); | |
e6dcd2dc | 593 | wake_up(&entry->wait); |
cee36a03 CM |
594 | } |
595 | ||
d458b054 | 596 | static void btrfs_run_ordered_extent_work(struct btrfs_work *work) |
9afab882 MX |
597 | { |
598 | struct btrfs_ordered_extent *ordered; | |
599 | ||
600 | ordered = container_of(work, struct btrfs_ordered_extent, flush_work); | |
601 | btrfs_start_ordered_extent(ordered->inode, ordered, 1); | |
602 | complete(&ordered->completion); | |
603 | } | |
604 | ||
d352ac68 CM |
605 | /* |
606 | * wait for all the ordered extents in a root. This is done when balancing | |
607 | * space between drives. | |
608 | */ | |
31f3d255 | 609 | int btrfs_wait_ordered_extents(struct btrfs_root *root, int nr) |
3eaa2885 | 610 | { |
9afab882 | 611 | struct list_head splice, works; |
9afab882 | 612 | struct btrfs_ordered_extent *ordered, *next; |
b0244199 | 613 | int count = 0; |
3eaa2885 CM |
614 | |
615 | INIT_LIST_HEAD(&splice); | |
9afab882 | 616 | INIT_LIST_HEAD(&works); |
3eaa2885 | 617 | |
31f3d255 | 618 | mutex_lock(&root->ordered_extent_mutex); |
199c2a9c MX |
619 | spin_lock(&root->ordered_extent_lock); |
620 | list_splice_init(&root->ordered_extents, &splice); | |
b0244199 | 621 | while (!list_empty(&splice) && nr) { |
199c2a9c MX |
622 | ordered = list_first_entry(&splice, struct btrfs_ordered_extent, |
623 | root_extent_list); | |
624 | list_move_tail(&ordered->root_extent_list, | |
625 | &root->ordered_extents); | |
199c2a9c MX |
626 | atomic_inc(&ordered->refs); |
627 | spin_unlock(&root->ordered_extent_lock); | |
3eaa2885 | 628 | |
a44903ab | 629 | btrfs_init_work(&ordered->flush_work, |
9e0af237 | 630 | btrfs_flush_delalloc_helper, |
a44903ab | 631 | btrfs_run_ordered_extent_work, NULL, NULL); |
199c2a9c | 632 | list_add_tail(&ordered->work_list, &works); |
a44903ab QW |
633 | btrfs_queue_work(root->fs_info->flush_workers, |
634 | &ordered->flush_work); | |
3eaa2885 | 635 | |
9afab882 | 636 | cond_resched(); |
199c2a9c | 637 | spin_lock(&root->ordered_extent_lock); |
b0244199 MX |
638 | if (nr != -1) |
639 | nr--; | |
640 | count++; | |
3eaa2885 | 641 | } |
b0244199 | 642 | list_splice_tail(&splice, &root->ordered_extents); |
199c2a9c | 643 | spin_unlock(&root->ordered_extent_lock); |
9afab882 MX |
644 | |
645 | list_for_each_entry_safe(ordered, next, &works, work_list) { | |
646 | list_del_init(&ordered->work_list); | |
647 | wait_for_completion(&ordered->completion); | |
9afab882 | 648 | btrfs_put_ordered_extent(ordered); |
9afab882 MX |
649 | cond_resched(); |
650 | } | |
31f3d255 | 651 | mutex_unlock(&root->ordered_extent_mutex); |
b0244199 MX |
652 | |
653 | return count; | |
3eaa2885 CM |
654 | } |
655 | ||
b0244199 | 656 | void btrfs_wait_ordered_roots(struct btrfs_fs_info *fs_info, int nr) |
199c2a9c MX |
657 | { |
658 | struct btrfs_root *root; | |
659 | struct list_head splice; | |
b0244199 | 660 | int done; |
199c2a9c MX |
661 | |
662 | INIT_LIST_HEAD(&splice); | |
663 | ||
8b9d83cd | 664 | mutex_lock(&fs_info->ordered_operations_mutex); |
199c2a9c MX |
665 | spin_lock(&fs_info->ordered_root_lock); |
666 | list_splice_init(&fs_info->ordered_roots, &splice); | |
b0244199 | 667 | while (!list_empty(&splice) && nr) { |
199c2a9c MX |
668 | root = list_first_entry(&splice, struct btrfs_root, |
669 | ordered_root); | |
670 | root = btrfs_grab_fs_root(root); | |
671 | BUG_ON(!root); | |
672 | list_move_tail(&root->ordered_root, | |
673 | &fs_info->ordered_roots); | |
674 | spin_unlock(&fs_info->ordered_root_lock); | |
675 | ||
31f3d255 | 676 | done = btrfs_wait_ordered_extents(root, nr); |
199c2a9c MX |
677 | btrfs_put_fs_root(root); |
678 | ||
679 | spin_lock(&fs_info->ordered_root_lock); | |
b0244199 MX |
680 | if (nr != -1) { |
681 | nr -= done; | |
682 | WARN_ON(nr < 0); | |
683 | } | |
199c2a9c | 684 | } |
931aa877 | 685 | list_splice_tail(&splice, &fs_info->ordered_roots); |
199c2a9c | 686 | spin_unlock(&fs_info->ordered_root_lock); |
8b9d83cd | 687 | mutex_unlock(&fs_info->ordered_operations_mutex); |
199c2a9c MX |
688 | } |
689 | ||
eb84ae03 CM |
690 | /* |
691 | * Used to start IO or wait for a given ordered extent to finish. | |
692 | * | |
693 | * If wait is one, this effectively waits on page writeback for all the pages | |
694 | * in the extent, and it waits on the io completion code to insert | |
695 | * metadata into the btree corresponding to the extent | |
696 | */ | |
697 | void btrfs_start_ordered_extent(struct inode *inode, | |
698 | struct btrfs_ordered_extent *entry, | |
699 | int wait) | |
e6dcd2dc CM |
700 | { |
701 | u64 start = entry->file_offset; | |
702 | u64 end = start + entry->len - 1; | |
e1b81e67 | 703 | |
1abe9b8a | 704 | trace_btrfs_ordered_extent_start(inode, entry); |
705 | ||
eb84ae03 CM |
706 | /* |
707 | * pages in the range can be dirty, clean or writeback. We | |
708 | * start IO on any dirty ones so the wait doesn't stall waiting | |
b2570314 | 709 | * for the flusher thread to find them |
eb84ae03 | 710 | */ |
4b46fce2 JB |
711 | if (!test_bit(BTRFS_ORDERED_DIRECT, &entry->flags)) |
712 | filemap_fdatawrite_range(inode->i_mapping, start, end); | |
c8b97818 | 713 | if (wait) { |
e6dcd2dc CM |
714 | wait_event(entry->wait, test_bit(BTRFS_ORDERED_COMPLETE, |
715 | &entry->flags)); | |
c8b97818 | 716 | } |
e6dcd2dc | 717 | } |
cee36a03 | 718 | |
eb84ae03 CM |
719 | /* |
720 | * Used to wait on ordered extents across a large range of bytes. | |
721 | */ | |
0ef8b726 | 722 | int btrfs_wait_ordered_range(struct inode *inode, u64 start, u64 len) |
e6dcd2dc | 723 | { |
0ef8b726 | 724 | int ret = 0; |
e6dcd2dc | 725 | u64 end; |
e5a2217e | 726 | u64 orig_end; |
e6dcd2dc | 727 | struct btrfs_ordered_extent *ordered; |
e5a2217e CM |
728 | |
729 | if (start + len < start) { | |
f421950f | 730 | orig_end = INT_LIMIT(loff_t); |
e5a2217e CM |
731 | } else { |
732 | orig_end = start + len - 1; | |
f421950f CM |
733 | if (orig_end > INT_LIMIT(loff_t)) |
734 | orig_end = INT_LIMIT(loff_t); | |
e5a2217e | 735 | } |
551ebb2d | 736 | |
e5a2217e CM |
737 | /* start IO across the range first to instantiate any delalloc |
738 | * extents | |
739 | */ | |
728404da | 740 | ret = btrfs_fdatawrite_range(inode, start, orig_end); |
0ef8b726 JB |
741 | if (ret) |
742 | return ret; | |
728404da | 743 | |
0ef8b726 JB |
744 | ret = filemap_fdatawait_range(inode->i_mapping, start, orig_end); |
745 | if (ret) | |
746 | return ret; | |
e5a2217e | 747 | |
f421950f | 748 | end = orig_end; |
d397712b | 749 | while (1) { |
e6dcd2dc | 750 | ordered = btrfs_lookup_first_ordered_extent(inode, end); |
d397712b | 751 | if (!ordered) |
e6dcd2dc | 752 | break; |
e5a2217e | 753 | if (ordered->file_offset > orig_end) { |
e6dcd2dc CM |
754 | btrfs_put_ordered_extent(ordered); |
755 | break; | |
756 | } | |
b52abf1e | 757 | if (ordered->file_offset + ordered->len <= start) { |
e6dcd2dc CM |
758 | btrfs_put_ordered_extent(ordered); |
759 | break; | |
760 | } | |
e5a2217e | 761 | btrfs_start_ordered_extent(inode, ordered, 1); |
e6dcd2dc | 762 | end = ordered->file_offset; |
0ef8b726 JB |
763 | if (test_bit(BTRFS_ORDERED_IOERR, &ordered->flags)) |
764 | ret = -EIO; | |
e6dcd2dc | 765 | btrfs_put_ordered_extent(ordered); |
0ef8b726 | 766 | if (ret || end == 0 || end == start) |
e6dcd2dc CM |
767 | break; |
768 | end--; | |
769 | } | |
0ef8b726 | 770 | return ret; |
cee36a03 CM |
771 | } |
772 | ||
eb84ae03 CM |
773 | /* |
774 | * find an ordered extent corresponding to file_offset. return NULL if | |
775 | * nothing is found, otherwise take a reference on the extent and return it | |
776 | */ | |
e6dcd2dc CM |
777 | struct btrfs_ordered_extent *btrfs_lookup_ordered_extent(struct inode *inode, |
778 | u64 file_offset) | |
779 | { | |
780 | struct btrfs_ordered_inode_tree *tree; | |
781 | struct rb_node *node; | |
782 | struct btrfs_ordered_extent *entry = NULL; | |
783 | ||
784 | tree = &BTRFS_I(inode)->ordered_tree; | |
5fd02043 | 785 | spin_lock_irq(&tree->lock); |
e6dcd2dc CM |
786 | node = tree_search(tree, file_offset); |
787 | if (!node) | |
788 | goto out; | |
789 | ||
790 | entry = rb_entry(node, struct btrfs_ordered_extent, rb_node); | |
791 | if (!offset_in_entry(entry, file_offset)) | |
792 | entry = NULL; | |
793 | if (entry) | |
794 | atomic_inc(&entry->refs); | |
795 | out: | |
5fd02043 | 796 | spin_unlock_irq(&tree->lock); |
e6dcd2dc CM |
797 | return entry; |
798 | } | |
799 | ||
4b46fce2 JB |
800 | /* Since the DIO code tries to lock a wide area we need to look for any ordered |
801 | * extents that exist in the range, rather than just the start of the range. | |
802 | */ | |
803 | struct btrfs_ordered_extent *btrfs_lookup_ordered_range(struct inode *inode, | |
804 | u64 file_offset, | |
805 | u64 len) | |
806 | { | |
807 | struct btrfs_ordered_inode_tree *tree; | |
808 | struct rb_node *node; | |
809 | struct btrfs_ordered_extent *entry = NULL; | |
810 | ||
811 | tree = &BTRFS_I(inode)->ordered_tree; | |
5fd02043 | 812 | spin_lock_irq(&tree->lock); |
4b46fce2 JB |
813 | node = tree_search(tree, file_offset); |
814 | if (!node) { | |
815 | node = tree_search(tree, file_offset + len); | |
816 | if (!node) | |
817 | goto out; | |
818 | } | |
819 | ||
820 | while (1) { | |
821 | entry = rb_entry(node, struct btrfs_ordered_extent, rb_node); | |
822 | if (range_overlaps(entry, file_offset, len)) | |
823 | break; | |
824 | ||
825 | if (entry->file_offset >= file_offset + len) { | |
826 | entry = NULL; | |
827 | break; | |
828 | } | |
829 | entry = NULL; | |
830 | node = rb_next(node); | |
831 | if (!node) | |
832 | break; | |
833 | } | |
834 | out: | |
835 | if (entry) | |
836 | atomic_inc(&entry->refs); | |
5fd02043 | 837 | spin_unlock_irq(&tree->lock); |
4b46fce2 JB |
838 | return entry; |
839 | } | |
840 | ||
eb84ae03 CM |
841 | /* |
842 | * lookup and return any extent before 'file_offset'. NULL is returned | |
843 | * if none is found | |
844 | */ | |
e6dcd2dc | 845 | struct btrfs_ordered_extent * |
d397712b | 846 | btrfs_lookup_first_ordered_extent(struct inode *inode, u64 file_offset) |
e6dcd2dc CM |
847 | { |
848 | struct btrfs_ordered_inode_tree *tree; | |
849 | struct rb_node *node; | |
850 | struct btrfs_ordered_extent *entry = NULL; | |
851 | ||
852 | tree = &BTRFS_I(inode)->ordered_tree; | |
5fd02043 | 853 | spin_lock_irq(&tree->lock); |
e6dcd2dc CM |
854 | node = tree_search(tree, file_offset); |
855 | if (!node) | |
856 | goto out; | |
857 | ||
858 | entry = rb_entry(node, struct btrfs_ordered_extent, rb_node); | |
859 | atomic_inc(&entry->refs); | |
860 | out: | |
5fd02043 | 861 | spin_unlock_irq(&tree->lock); |
e6dcd2dc | 862 | return entry; |
81d7ed29 | 863 | } |
dbe674a9 | 864 | |
eb84ae03 CM |
865 | /* |
866 | * After an extent is done, call this to conditionally update the on disk | |
867 | * i_size. i_size is updated to cover any fully written part of the file. | |
868 | */ | |
c2167754 | 869 | int btrfs_ordered_update_i_size(struct inode *inode, u64 offset, |
dbe674a9 CM |
870 | struct btrfs_ordered_extent *ordered) |
871 | { | |
872 | struct btrfs_ordered_inode_tree *tree = &BTRFS_I(inode)->ordered_tree; | |
dbe674a9 CM |
873 | u64 disk_i_size; |
874 | u64 new_i_size; | |
c2167754 | 875 | u64 i_size = i_size_read(inode); |
dbe674a9 | 876 | struct rb_node *node; |
c2167754 | 877 | struct rb_node *prev = NULL; |
dbe674a9 | 878 | struct btrfs_ordered_extent *test; |
c2167754 YZ |
879 | int ret = 1; |
880 | ||
77cef2ec JB |
881 | spin_lock_irq(&tree->lock); |
882 | if (ordered) { | |
c2167754 | 883 | offset = entry_end(ordered); |
77cef2ec JB |
884 | if (test_bit(BTRFS_ORDERED_TRUNCATED, &ordered->flags)) |
885 | offset = min(offset, | |
886 | ordered->file_offset + | |
887 | ordered->truncated_len); | |
888 | } else { | |
a038fab0 | 889 | offset = ALIGN(offset, BTRFS_I(inode)->root->sectorsize); |
77cef2ec | 890 | } |
dbe674a9 CM |
891 | disk_i_size = BTRFS_I(inode)->disk_i_size; |
892 | ||
c2167754 YZ |
893 | /* truncate file */ |
894 | if (disk_i_size > i_size) { | |
895 | BTRFS_I(inode)->disk_i_size = i_size; | |
896 | ret = 0; | |
897 | goto out; | |
898 | } | |
899 | ||
dbe674a9 CM |
900 | /* |
901 | * if the disk i_size is already at the inode->i_size, or | |
902 | * this ordered extent is inside the disk i_size, we're done | |
903 | */ | |
5d1f4020 JB |
904 | if (disk_i_size == i_size) |
905 | goto out; | |
906 | ||
907 | /* | |
908 | * We still need to update disk_i_size if outstanding_isize is greater | |
909 | * than disk_i_size. | |
910 | */ | |
911 | if (offset <= disk_i_size && | |
912 | (!ordered || ordered->outstanding_isize <= disk_i_size)) | |
dbe674a9 | 913 | goto out; |
dbe674a9 | 914 | |
dbe674a9 CM |
915 | /* |
916 | * walk backward from this ordered extent to disk_i_size. | |
917 | * if we find an ordered extent then we can't update disk i_size | |
918 | * yet | |
919 | */ | |
c2167754 YZ |
920 | if (ordered) { |
921 | node = rb_prev(&ordered->rb_node); | |
922 | } else { | |
923 | prev = tree_search(tree, offset); | |
924 | /* | |
925 | * we insert file extents without involving ordered struct, | |
926 | * so there should be no ordered struct cover this offset | |
927 | */ | |
928 | if (prev) { | |
929 | test = rb_entry(prev, struct btrfs_ordered_extent, | |
930 | rb_node); | |
931 | BUG_ON(offset_in_entry(test, offset)); | |
932 | } | |
933 | node = prev; | |
934 | } | |
5fd02043 | 935 | for (; node; node = rb_prev(node)) { |
dbe674a9 | 936 | test = rb_entry(node, struct btrfs_ordered_extent, rb_node); |
5fd02043 JB |
937 | |
938 | /* We treat this entry as if it doesnt exist */ | |
939 | if (test_bit(BTRFS_ORDERED_UPDATED_ISIZE, &test->flags)) | |
940 | continue; | |
dbe674a9 CM |
941 | if (test->file_offset + test->len <= disk_i_size) |
942 | break; | |
c2167754 | 943 | if (test->file_offset >= i_size) |
dbe674a9 | 944 | break; |
59fe4f41 | 945 | if (entry_end(test) > disk_i_size) { |
b9a8cc5b MX |
946 | /* |
947 | * we don't update disk_i_size now, so record this | |
948 | * undealt i_size. Or we will not know the real | |
949 | * i_size. | |
950 | */ | |
951 | if (test->outstanding_isize < offset) | |
952 | test->outstanding_isize = offset; | |
953 | if (ordered && | |
954 | ordered->outstanding_isize > | |
955 | test->outstanding_isize) | |
956 | test->outstanding_isize = | |
957 | ordered->outstanding_isize; | |
dbe674a9 | 958 | goto out; |
5fd02043 | 959 | } |
dbe674a9 | 960 | } |
b9a8cc5b | 961 | new_i_size = min_t(u64, offset, i_size); |
dbe674a9 CM |
962 | |
963 | /* | |
b9a8cc5b MX |
964 | * Some ordered extents may completed before the current one, and |
965 | * we hold the real i_size in ->outstanding_isize. | |
dbe674a9 | 966 | */ |
b9a8cc5b MX |
967 | if (ordered && ordered->outstanding_isize > new_i_size) |
968 | new_i_size = min_t(u64, ordered->outstanding_isize, i_size); | |
dbe674a9 | 969 | BTRFS_I(inode)->disk_i_size = new_i_size; |
c2167754 | 970 | ret = 0; |
dbe674a9 | 971 | out: |
c2167754 | 972 | /* |
5fd02043 JB |
973 | * We need to do this because we can't remove ordered extents until |
974 | * after the i_disk_size has been updated and then the inode has been | |
975 | * updated to reflect the change, so we need to tell anybody who finds | |
976 | * this ordered extent that we've already done all the real work, we | |
977 | * just haven't completed all the other work. | |
c2167754 YZ |
978 | */ |
979 | if (ordered) | |
5fd02043 JB |
980 | set_bit(BTRFS_ORDERED_UPDATED_ISIZE, &ordered->flags); |
981 | spin_unlock_irq(&tree->lock); | |
c2167754 | 982 | return ret; |
dbe674a9 | 983 | } |
ba1da2f4 | 984 | |
eb84ae03 CM |
985 | /* |
986 | * search the ordered extents for one corresponding to 'offset' and | |
987 | * try to find a checksum. This is used because we allow pages to | |
988 | * be reclaimed before their checksum is actually put into the btree | |
989 | */ | |
d20f7043 | 990 | int btrfs_find_ordered_sum(struct inode *inode, u64 offset, u64 disk_bytenr, |
e4100d98 | 991 | u32 *sum, int len) |
ba1da2f4 CM |
992 | { |
993 | struct btrfs_ordered_sum *ordered_sum; | |
ba1da2f4 CM |
994 | struct btrfs_ordered_extent *ordered; |
995 | struct btrfs_ordered_inode_tree *tree = &BTRFS_I(inode)->ordered_tree; | |
3edf7d33 CM |
996 | unsigned long num_sectors; |
997 | unsigned long i; | |
998 | u32 sectorsize = BTRFS_I(inode)->root->sectorsize; | |
e4100d98 | 999 | int index = 0; |
ba1da2f4 CM |
1000 | |
1001 | ordered = btrfs_lookup_ordered_extent(inode, offset); | |
1002 | if (!ordered) | |
e4100d98 | 1003 | return 0; |
ba1da2f4 | 1004 | |
5fd02043 | 1005 | spin_lock_irq(&tree->lock); |
c6e30871 | 1006 | list_for_each_entry_reverse(ordered_sum, &ordered->list, list) { |
e4100d98 MX |
1007 | if (disk_bytenr >= ordered_sum->bytenr && |
1008 | disk_bytenr < ordered_sum->bytenr + ordered_sum->len) { | |
1009 | i = (disk_bytenr - ordered_sum->bytenr) >> | |
1010 | inode->i_sb->s_blocksize_bits; | |
e4100d98 MX |
1011 | num_sectors = ordered_sum->len >> |
1012 | inode->i_sb->s_blocksize_bits; | |
f51a4a18 MX |
1013 | num_sectors = min_t(int, len - index, num_sectors - i); |
1014 | memcpy(sum + index, ordered_sum->sums + i, | |
1015 | num_sectors); | |
1016 | ||
1017 | index += (int)num_sectors; | |
1018 | if (index == len) | |
1019 | goto out; | |
1020 | disk_bytenr += num_sectors * sectorsize; | |
ba1da2f4 CM |
1021 | } |
1022 | } | |
1023 | out: | |
5fd02043 | 1024 | spin_unlock_irq(&tree->lock); |
89642229 | 1025 | btrfs_put_ordered_extent(ordered); |
e4100d98 | 1026 | return index; |
ba1da2f4 CM |
1027 | } |
1028 | ||
6352b91d MX |
1029 | int __init ordered_data_init(void) |
1030 | { | |
1031 | btrfs_ordered_extent_cache = kmem_cache_create("btrfs_ordered_extent", | |
1032 | sizeof(struct btrfs_ordered_extent), 0, | |
1033 | SLAB_RECLAIM_ACCOUNT | SLAB_MEM_SPREAD, | |
1034 | NULL); | |
1035 | if (!btrfs_ordered_extent_cache) | |
1036 | return -ENOMEM; | |
25287e0a | 1037 | |
6352b91d MX |
1038 | return 0; |
1039 | } | |
1040 | ||
1041 | void ordered_data_exit(void) | |
1042 | { | |
1043 | if (btrfs_ordered_extent_cache) | |
1044 | kmem_cache_destroy(btrfs_ordered_extent_cache); | |
1045 | } |