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Commit | Line | Data |
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0f9dd46c JB |
1 | /* |
2 | * Copyright (C) 2008 Red Hat. 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 | ||
96303081 | 19 | #include <linux/pagemap.h> |
0f9dd46c | 20 | #include <linux/sched.h> |
5a0e3ad6 | 21 | #include <linux/slab.h> |
96303081 | 22 | #include <linux/math64.h> |
0f9dd46c | 23 | #include "ctree.h" |
fa9c0d79 CM |
24 | #include "free-space-cache.h" |
25 | #include "transaction.h" | |
0af3d00b | 26 | #include "disk-io.h" |
43be2146 | 27 | #include "extent_io.h" |
581bb050 | 28 | #include "inode-map.h" |
fa9c0d79 | 29 | |
96303081 JB |
30 | #define BITS_PER_BITMAP (PAGE_CACHE_SIZE * 8) |
31 | #define MAX_CACHE_BYTES_PER_GIG (32 * 1024) | |
0f9dd46c | 32 | |
34d52cb6 | 33 | static int link_free_space(struct btrfs_free_space_ctl *ctl, |
0cb59c99 JB |
34 | struct btrfs_free_space *info); |
35 | ||
0414efae LZ |
36 | static struct inode *__lookup_free_space_inode(struct btrfs_root *root, |
37 | struct btrfs_path *path, | |
38 | u64 offset) | |
0af3d00b JB |
39 | { |
40 | struct btrfs_key key; | |
41 | struct btrfs_key location; | |
42 | struct btrfs_disk_key disk_key; | |
43 | struct btrfs_free_space_header *header; | |
44 | struct extent_buffer *leaf; | |
45 | struct inode *inode = NULL; | |
46 | int ret; | |
47 | ||
0af3d00b | 48 | key.objectid = BTRFS_FREE_SPACE_OBJECTID; |
0414efae | 49 | key.offset = offset; |
0af3d00b JB |
50 | key.type = 0; |
51 | ||
52 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); | |
53 | if (ret < 0) | |
54 | return ERR_PTR(ret); | |
55 | if (ret > 0) { | |
b3b4aa74 | 56 | btrfs_release_path(path); |
0af3d00b JB |
57 | return ERR_PTR(-ENOENT); |
58 | } | |
59 | ||
60 | leaf = path->nodes[0]; | |
61 | header = btrfs_item_ptr(leaf, path->slots[0], | |
62 | struct btrfs_free_space_header); | |
63 | btrfs_free_space_key(leaf, header, &disk_key); | |
64 | btrfs_disk_key_to_cpu(&location, &disk_key); | |
b3b4aa74 | 65 | btrfs_release_path(path); |
0af3d00b JB |
66 | |
67 | inode = btrfs_iget(root->fs_info->sb, &location, root, NULL); | |
68 | if (!inode) | |
69 | return ERR_PTR(-ENOENT); | |
70 | if (IS_ERR(inode)) | |
71 | return inode; | |
72 | if (is_bad_inode(inode)) { | |
73 | iput(inode); | |
74 | return ERR_PTR(-ENOENT); | |
75 | } | |
76 | ||
adae52b9 MX |
77 | inode->i_mapping->flags &= ~__GFP_FS; |
78 | ||
0414efae LZ |
79 | return inode; |
80 | } | |
81 | ||
82 | struct inode *lookup_free_space_inode(struct btrfs_root *root, | |
83 | struct btrfs_block_group_cache | |
84 | *block_group, struct btrfs_path *path) | |
85 | { | |
86 | struct inode *inode = NULL; | |
87 | ||
88 | spin_lock(&block_group->lock); | |
89 | if (block_group->inode) | |
90 | inode = igrab(block_group->inode); | |
91 | spin_unlock(&block_group->lock); | |
92 | if (inode) | |
93 | return inode; | |
94 | ||
95 | inode = __lookup_free_space_inode(root, path, | |
96 | block_group->key.objectid); | |
97 | if (IS_ERR(inode)) | |
98 | return inode; | |
99 | ||
0af3d00b | 100 | spin_lock(&block_group->lock); |
2f356126 JB |
101 | if (BTRFS_I(inode)->flags & BTRFS_INODE_NODATASUM) { |
102 | printk(KERN_INFO "Old style space inode found, converting.\n"); | |
103 | BTRFS_I(inode)->flags &= ~BTRFS_INODE_NODATASUM; | |
104 | block_group->disk_cache_state = BTRFS_DC_CLEAR; | |
105 | } | |
106 | ||
7841cb28 | 107 | if (!btrfs_fs_closing(root->fs_info)) { |
0af3d00b JB |
108 | block_group->inode = igrab(inode); |
109 | block_group->iref = 1; | |
110 | } | |
111 | spin_unlock(&block_group->lock); | |
112 | ||
113 | return inode; | |
114 | } | |
115 | ||
0414efae LZ |
116 | int __create_free_space_inode(struct btrfs_root *root, |
117 | struct btrfs_trans_handle *trans, | |
118 | struct btrfs_path *path, u64 ino, u64 offset) | |
0af3d00b JB |
119 | { |
120 | struct btrfs_key key; | |
121 | struct btrfs_disk_key disk_key; | |
122 | struct btrfs_free_space_header *header; | |
123 | struct btrfs_inode_item *inode_item; | |
124 | struct extent_buffer *leaf; | |
0af3d00b JB |
125 | int ret; |
126 | ||
0414efae | 127 | ret = btrfs_insert_empty_inode(trans, root, path, ino); |
0af3d00b JB |
128 | if (ret) |
129 | return ret; | |
130 | ||
131 | leaf = path->nodes[0]; | |
132 | inode_item = btrfs_item_ptr(leaf, path->slots[0], | |
133 | struct btrfs_inode_item); | |
134 | btrfs_item_key(leaf, &disk_key, path->slots[0]); | |
135 | memset_extent_buffer(leaf, 0, (unsigned long)inode_item, | |
136 | sizeof(*inode_item)); | |
137 | btrfs_set_inode_generation(leaf, inode_item, trans->transid); | |
138 | btrfs_set_inode_size(leaf, inode_item, 0); | |
139 | btrfs_set_inode_nbytes(leaf, inode_item, 0); | |
140 | btrfs_set_inode_uid(leaf, inode_item, 0); | |
141 | btrfs_set_inode_gid(leaf, inode_item, 0); | |
142 | btrfs_set_inode_mode(leaf, inode_item, S_IFREG | 0600); | |
143 | btrfs_set_inode_flags(leaf, inode_item, BTRFS_INODE_NOCOMPRESS | | |
2f356126 | 144 | BTRFS_INODE_PREALLOC); |
0af3d00b JB |
145 | btrfs_set_inode_nlink(leaf, inode_item, 1); |
146 | btrfs_set_inode_transid(leaf, inode_item, trans->transid); | |
0414efae | 147 | btrfs_set_inode_block_group(leaf, inode_item, offset); |
0af3d00b | 148 | btrfs_mark_buffer_dirty(leaf); |
b3b4aa74 | 149 | btrfs_release_path(path); |
0af3d00b JB |
150 | |
151 | key.objectid = BTRFS_FREE_SPACE_OBJECTID; | |
0414efae | 152 | key.offset = offset; |
0af3d00b JB |
153 | key.type = 0; |
154 | ||
155 | ret = btrfs_insert_empty_item(trans, root, path, &key, | |
156 | sizeof(struct btrfs_free_space_header)); | |
157 | if (ret < 0) { | |
b3b4aa74 | 158 | btrfs_release_path(path); |
0af3d00b JB |
159 | return ret; |
160 | } | |
161 | leaf = path->nodes[0]; | |
162 | header = btrfs_item_ptr(leaf, path->slots[0], | |
163 | struct btrfs_free_space_header); | |
164 | memset_extent_buffer(leaf, 0, (unsigned long)header, sizeof(*header)); | |
165 | btrfs_set_free_space_key(leaf, header, &disk_key); | |
166 | btrfs_mark_buffer_dirty(leaf); | |
b3b4aa74 | 167 | btrfs_release_path(path); |
0af3d00b JB |
168 | |
169 | return 0; | |
170 | } | |
171 | ||
0414efae LZ |
172 | int create_free_space_inode(struct btrfs_root *root, |
173 | struct btrfs_trans_handle *trans, | |
174 | struct btrfs_block_group_cache *block_group, | |
175 | struct btrfs_path *path) | |
176 | { | |
177 | int ret; | |
178 | u64 ino; | |
179 | ||
180 | ret = btrfs_find_free_objectid(root, &ino); | |
181 | if (ret < 0) | |
182 | return ret; | |
183 | ||
184 | return __create_free_space_inode(root, trans, path, ino, | |
185 | block_group->key.objectid); | |
186 | } | |
187 | ||
0af3d00b JB |
188 | int btrfs_truncate_free_space_cache(struct btrfs_root *root, |
189 | struct btrfs_trans_handle *trans, | |
190 | struct btrfs_path *path, | |
191 | struct inode *inode) | |
192 | { | |
193 | loff_t oldsize; | |
194 | int ret = 0; | |
195 | ||
196 | trans->block_rsv = root->orphan_block_rsv; | |
197 | ret = btrfs_block_rsv_check(trans, root, | |
198 | root->orphan_block_rsv, | |
199 | 0, 5); | |
200 | if (ret) | |
201 | return ret; | |
202 | ||
203 | oldsize = i_size_read(inode); | |
204 | btrfs_i_size_write(inode, 0); | |
205 | truncate_pagecache(inode, oldsize, 0); | |
206 | ||
207 | /* | |
208 | * We don't need an orphan item because truncating the free space cache | |
209 | * will never be split across transactions. | |
210 | */ | |
211 | ret = btrfs_truncate_inode_items(trans, root, inode, | |
212 | 0, BTRFS_EXTENT_DATA_KEY); | |
213 | if (ret) { | |
214 | WARN_ON(1); | |
215 | return ret; | |
216 | } | |
217 | ||
82d5902d LZ |
218 | ret = btrfs_update_inode(trans, root, inode); |
219 | return ret; | |
0af3d00b JB |
220 | } |
221 | ||
9d66e233 JB |
222 | static int readahead_cache(struct inode *inode) |
223 | { | |
224 | struct file_ra_state *ra; | |
225 | unsigned long last_index; | |
226 | ||
227 | ra = kzalloc(sizeof(*ra), GFP_NOFS); | |
228 | if (!ra) | |
229 | return -ENOMEM; | |
230 | ||
231 | file_ra_state_init(ra, inode->i_mapping); | |
232 | last_index = (i_size_read(inode) - 1) >> PAGE_CACHE_SHIFT; | |
233 | ||
234 | page_cache_sync_readahead(inode->i_mapping, ra, NULL, 0, last_index); | |
235 | ||
236 | kfree(ra); | |
237 | ||
238 | return 0; | |
239 | } | |
240 | ||
0414efae LZ |
241 | int __load_free_space_cache(struct btrfs_root *root, struct inode *inode, |
242 | struct btrfs_free_space_ctl *ctl, | |
243 | struct btrfs_path *path, u64 offset) | |
9d66e233 | 244 | { |
9d66e233 JB |
245 | struct btrfs_free_space_header *header; |
246 | struct extent_buffer *leaf; | |
247 | struct page *page; | |
9d66e233 JB |
248 | struct btrfs_key key; |
249 | struct list_head bitmaps; | |
250 | u64 num_entries; | |
251 | u64 num_bitmaps; | |
252 | u64 generation; | |
9d66e233 | 253 | pgoff_t index = 0; |
f6a39829 | 254 | int ret = 0; |
9d66e233 JB |
255 | |
256 | INIT_LIST_HEAD(&bitmaps); | |
257 | ||
9d66e233 | 258 | /* Nothing in the space cache, goodbye */ |
0414efae | 259 | if (!i_size_read(inode)) |
9d66e233 | 260 | goto out; |
9d66e233 JB |
261 | |
262 | key.objectid = BTRFS_FREE_SPACE_OBJECTID; | |
0414efae | 263 | key.offset = offset; |
9d66e233 JB |
264 | key.type = 0; |
265 | ||
266 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); | |
0414efae LZ |
267 | if (ret < 0) |
268 | goto out; | |
269 | else if (ret > 0) { | |
945d8962 | 270 | btrfs_release_path(path); |
0414efae | 271 | ret = 0; |
9d66e233 JB |
272 | goto out; |
273 | } | |
274 | ||
0414efae LZ |
275 | ret = -1; |
276 | ||
9d66e233 JB |
277 | leaf = path->nodes[0]; |
278 | header = btrfs_item_ptr(leaf, path->slots[0], | |
279 | struct btrfs_free_space_header); | |
280 | num_entries = btrfs_free_space_entries(leaf, header); | |
281 | num_bitmaps = btrfs_free_space_bitmaps(leaf, header); | |
282 | generation = btrfs_free_space_generation(leaf, header); | |
945d8962 | 283 | btrfs_release_path(path); |
9d66e233 JB |
284 | |
285 | if (BTRFS_I(inode)->generation != generation) { | |
286 | printk(KERN_ERR "btrfs: free space inode generation (%llu) did" | |
0414efae | 287 | " not match free space cache generation (%llu)\n", |
9d66e233 | 288 | (unsigned long long)BTRFS_I(inode)->generation, |
0414efae LZ |
289 | (unsigned long long)generation); |
290 | goto out; | |
9d66e233 JB |
291 | } |
292 | ||
293 | if (!num_entries) | |
294 | goto out; | |
295 | ||
9d66e233 | 296 | ret = readahead_cache(inode); |
0414efae | 297 | if (ret) |
9d66e233 | 298 | goto out; |
9d66e233 JB |
299 | |
300 | while (1) { | |
301 | struct btrfs_free_space_entry *entry; | |
302 | struct btrfs_free_space *e; | |
303 | void *addr; | |
304 | unsigned long offset = 0; | |
9d66e233 JB |
305 | int need_loop = 0; |
306 | ||
307 | if (!num_entries && !num_bitmaps) | |
308 | break; | |
309 | ||
a94733d0 | 310 | page = find_or_create_page(inode->i_mapping, index, GFP_NOFS); |
0414efae | 311 | if (!page) |
9d66e233 | 312 | goto free_cache; |
9d66e233 JB |
313 | |
314 | if (!PageUptodate(page)) { | |
315 | btrfs_readpage(NULL, page); | |
316 | lock_page(page); | |
317 | if (!PageUptodate(page)) { | |
318 | unlock_page(page); | |
319 | page_cache_release(page); | |
320 | printk(KERN_ERR "btrfs: error reading free " | |
0414efae | 321 | "space cache\n"); |
9d66e233 JB |
322 | goto free_cache; |
323 | } | |
324 | } | |
325 | addr = kmap(page); | |
326 | ||
327 | if (index == 0) { | |
328 | u64 *gen; | |
329 | ||
2f356126 JB |
330 | /* |
331 | * We put a bogus crc in the front of the first page in | |
332 | * case old kernels try to mount a fs with the new | |
333 | * format to make sure they discard the cache. | |
334 | */ | |
335 | addr += sizeof(u64); | |
336 | offset += sizeof(u64); | |
337 | ||
338 | gen = addr; | |
9d66e233 JB |
339 | if (*gen != BTRFS_I(inode)->generation) { |
340 | printk(KERN_ERR "btrfs: space cache generation" | |
0414efae | 341 | " (%llu) does not match inode (%llu)\n", |
9d66e233 JB |
342 | (unsigned long long)*gen, |
343 | (unsigned long long) | |
0414efae | 344 | BTRFS_I(inode)->generation); |
9d66e233 JB |
345 | kunmap(page); |
346 | unlock_page(page); | |
347 | page_cache_release(page); | |
348 | goto free_cache; | |
349 | } | |
2f356126 JB |
350 | addr += sizeof(u64); |
351 | offset += sizeof(u64); | |
9d66e233 | 352 | } |
2f356126 | 353 | entry = addr; |
9d66e233 JB |
354 | |
355 | while (1) { | |
356 | if (!num_entries) | |
357 | break; | |
358 | ||
359 | need_loop = 1; | |
dc89e982 JB |
360 | e = kmem_cache_zalloc(btrfs_free_space_cachep, |
361 | GFP_NOFS); | |
9d66e233 JB |
362 | if (!e) { |
363 | kunmap(page); | |
364 | unlock_page(page); | |
365 | page_cache_release(page); | |
366 | goto free_cache; | |
367 | } | |
368 | ||
369 | e->offset = le64_to_cpu(entry->offset); | |
370 | e->bytes = le64_to_cpu(entry->bytes); | |
371 | if (!e->bytes) { | |
372 | kunmap(page); | |
dc89e982 | 373 | kmem_cache_free(btrfs_free_space_cachep, e); |
9d66e233 JB |
374 | unlock_page(page); |
375 | page_cache_release(page); | |
376 | goto free_cache; | |
377 | } | |
378 | ||
379 | if (entry->type == BTRFS_FREE_SPACE_EXTENT) { | |
34d52cb6 LZ |
380 | spin_lock(&ctl->tree_lock); |
381 | ret = link_free_space(ctl, e); | |
382 | spin_unlock(&ctl->tree_lock); | |
207dde82 JB |
383 | if (ret) { |
384 | printk(KERN_ERR "Duplicate entries in " | |
385 | "free space cache, dumping\n"); | |
386 | kunmap(page); | |
387 | unlock_page(page); | |
388 | page_cache_release(page); | |
389 | goto free_cache; | |
390 | } | |
9d66e233 JB |
391 | } else { |
392 | e->bitmap = kzalloc(PAGE_CACHE_SIZE, GFP_NOFS); | |
393 | if (!e->bitmap) { | |
394 | kunmap(page); | |
dc89e982 JB |
395 | kmem_cache_free( |
396 | btrfs_free_space_cachep, e); | |
9d66e233 JB |
397 | unlock_page(page); |
398 | page_cache_release(page); | |
399 | goto free_cache; | |
400 | } | |
34d52cb6 | 401 | spin_lock(&ctl->tree_lock); |
f6a39829 | 402 | ret = link_free_space(ctl, e); |
34d52cb6 LZ |
403 | ctl->total_bitmaps++; |
404 | ctl->op->recalc_thresholds(ctl); | |
405 | spin_unlock(&ctl->tree_lock); | |
207dde82 JB |
406 | if (ret) { |
407 | printk(KERN_ERR "Duplicate entries in " | |
408 | "free space cache, dumping\n"); | |
409 | kunmap(page); | |
410 | unlock_page(page); | |
411 | page_cache_release(page); | |
412 | goto free_cache; | |
413 | } | |
f6a39829 | 414 | list_add_tail(&e->list, &bitmaps); |
9d66e233 JB |
415 | } |
416 | ||
417 | num_entries--; | |
418 | offset += sizeof(struct btrfs_free_space_entry); | |
419 | if (offset + sizeof(struct btrfs_free_space_entry) >= | |
420 | PAGE_CACHE_SIZE) | |
421 | break; | |
422 | entry++; | |
423 | } | |
424 | ||
425 | /* | |
426 | * We read an entry out of this page, we need to move on to the | |
427 | * next page. | |
428 | */ | |
429 | if (need_loop) { | |
430 | kunmap(page); | |
431 | goto next; | |
432 | } | |
433 | ||
434 | /* | |
435 | * We add the bitmaps at the end of the entries in order that | |
436 | * the bitmap entries are added to the cache. | |
437 | */ | |
438 | e = list_entry(bitmaps.next, struct btrfs_free_space, list); | |
439 | list_del_init(&e->list); | |
440 | memcpy(e->bitmap, addr, PAGE_CACHE_SIZE); | |
441 | kunmap(page); | |
442 | num_bitmaps--; | |
443 | next: | |
444 | unlock_page(page); | |
445 | page_cache_release(page); | |
446 | index++; | |
447 | } | |
448 | ||
449 | ret = 1; | |
450 | out: | |
9d66e233 | 451 | return ret; |
9d66e233 | 452 | free_cache: |
0414efae | 453 | __btrfs_remove_free_space_cache(ctl); |
9d66e233 JB |
454 | goto out; |
455 | } | |
456 | ||
0414efae LZ |
457 | int load_free_space_cache(struct btrfs_fs_info *fs_info, |
458 | struct btrfs_block_group_cache *block_group) | |
0cb59c99 | 459 | { |
34d52cb6 | 460 | struct btrfs_free_space_ctl *ctl = block_group->free_space_ctl; |
0414efae LZ |
461 | struct btrfs_root *root = fs_info->tree_root; |
462 | struct inode *inode; | |
463 | struct btrfs_path *path; | |
464 | int ret; | |
465 | bool matched; | |
466 | u64 used = btrfs_block_group_used(&block_group->item); | |
467 | ||
468 | /* | |
469 | * If we're unmounting then just return, since this does a search on the | |
470 | * normal root and not the commit root and we could deadlock. | |
471 | */ | |
7841cb28 | 472 | if (btrfs_fs_closing(fs_info)) |
0414efae LZ |
473 | return 0; |
474 | ||
475 | /* | |
476 | * If this block group has been marked to be cleared for one reason or | |
477 | * another then we can't trust the on disk cache, so just return. | |
478 | */ | |
9d66e233 | 479 | spin_lock(&block_group->lock); |
0414efae LZ |
480 | if (block_group->disk_cache_state != BTRFS_DC_WRITTEN) { |
481 | spin_unlock(&block_group->lock); | |
482 | return 0; | |
483 | } | |
9d66e233 | 484 | spin_unlock(&block_group->lock); |
0414efae LZ |
485 | |
486 | path = btrfs_alloc_path(); | |
487 | if (!path) | |
488 | return 0; | |
489 | ||
490 | inode = lookup_free_space_inode(root, block_group, path); | |
491 | if (IS_ERR(inode)) { | |
492 | btrfs_free_path(path); | |
493 | return 0; | |
494 | } | |
495 | ||
496 | ret = __load_free_space_cache(fs_info->tree_root, inode, ctl, | |
497 | path, block_group->key.objectid); | |
498 | btrfs_free_path(path); | |
499 | if (ret <= 0) | |
500 | goto out; | |
501 | ||
502 | spin_lock(&ctl->tree_lock); | |
503 | matched = (ctl->free_space == (block_group->key.offset - used - | |
504 | block_group->bytes_super)); | |
505 | spin_unlock(&ctl->tree_lock); | |
506 | ||
507 | if (!matched) { | |
508 | __btrfs_remove_free_space_cache(ctl); | |
509 | printk(KERN_ERR "block group %llu has an wrong amount of free " | |
510 | "space\n", block_group->key.objectid); | |
511 | ret = -1; | |
512 | } | |
513 | out: | |
514 | if (ret < 0) { | |
515 | /* This cache is bogus, make sure it gets cleared */ | |
516 | spin_lock(&block_group->lock); | |
517 | block_group->disk_cache_state = BTRFS_DC_CLEAR; | |
518 | spin_unlock(&block_group->lock); | |
82d5902d | 519 | ret = 0; |
0414efae LZ |
520 | |
521 | printk(KERN_ERR "btrfs: failed to load free space cache " | |
522 | "for block group %llu\n", block_group->key.objectid); | |
523 | } | |
524 | ||
525 | iput(inode); | |
526 | return ret; | |
9d66e233 JB |
527 | } |
528 | ||
0414efae LZ |
529 | int __btrfs_write_out_cache(struct btrfs_root *root, struct inode *inode, |
530 | struct btrfs_free_space_ctl *ctl, | |
531 | struct btrfs_block_group_cache *block_group, | |
532 | struct btrfs_trans_handle *trans, | |
533 | struct btrfs_path *path, u64 offset) | |
0cb59c99 JB |
534 | { |
535 | struct btrfs_free_space_header *header; | |
536 | struct extent_buffer *leaf; | |
0cb59c99 JB |
537 | struct rb_node *node; |
538 | struct list_head *pos, *n; | |
be1a12a0 | 539 | struct page **pages; |
0cb59c99 JB |
540 | struct page *page; |
541 | struct extent_state *cached_state = NULL; | |
43be2146 JB |
542 | struct btrfs_free_cluster *cluster = NULL; |
543 | struct extent_io_tree *unpin = NULL; | |
0cb59c99 JB |
544 | struct list_head bitmap_list; |
545 | struct btrfs_key key; | |
43be2146 | 546 | u64 start, end, len; |
0cb59c99 | 547 | u64 bytes = 0; |
2f356126 | 548 | u32 crc = ~(u32)0; |
be1a12a0 | 549 | int index = 0, num_pages = 0; |
0cb59c99 JB |
550 | int entries = 0; |
551 | int bitmaps = 0; | |
0414efae | 552 | int ret = -1; |
43be2146 | 553 | bool next_page = false; |
be1a12a0 | 554 | bool out_of_space = false; |
0cb59c99 | 555 | |
0cb59c99 JB |
556 | INIT_LIST_HEAD(&bitmap_list); |
557 | ||
34d52cb6 | 558 | node = rb_first(&ctl->free_space_offset); |
0414efae | 559 | if (!node) |
0cb59c99 JB |
560 | return 0; |
561 | ||
0414efae LZ |
562 | if (!i_size_read(inode)) |
563 | return -1; | |
2b20982e | 564 | |
be1a12a0 JB |
565 | num_pages = (i_size_read(inode) + PAGE_CACHE_SIZE - 1) >> |
566 | PAGE_CACHE_SHIFT; | |
211f96c2 | 567 | |
0cb59c99 JB |
568 | filemap_write_and_wait(inode->i_mapping); |
569 | btrfs_wait_ordered_range(inode, inode->i_size & | |
570 | ~(root->sectorsize - 1), (u64)-1); | |
571 | ||
be1a12a0 | 572 | pages = kzalloc(sizeof(struct page *) * num_pages, GFP_NOFS); |
2f356126 | 573 | if (!pages) |
0414efae | 574 | return -1; |
be1a12a0 | 575 | |
43be2146 | 576 | /* Get the cluster for this block_group if it exists */ |
0414efae | 577 | if (block_group && !list_empty(&block_group->cluster_list)) |
43be2146 JB |
578 | cluster = list_entry(block_group->cluster_list.next, |
579 | struct btrfs_free_cluster, | |
580 | block_group_list); | |
581 | ||
582 | /* | |
583 | * We shouldn't have switched the pinned extents yet so this is the | |
584 | * right one | |
585 | */ | |
586 | unpin = root->fs_info->pinned_extents; | |
587 | ||
0cb59c99 JB |
588 | /* |
589 | * Lock all pages first so we can lock the extent safely. | |
590 | * | |
591 | * NOTE: Because we hold the ref the entire time we're going to write to | |
592 | * the page find_get_page should never fail, so we don't do a check | |
593 | * after find_get_page at this point. Just putting this here so people | |
594 | * know and don't freak out. | |
595 | */ | |
be1a12a0 | 596 | while (index < num_pages) { |
a94733d0 | 597 | page = find_or_create_page(inode->i_mapping, index, GFP_NOFS); |
0cb59c99 | 598 | if (!page) { |
be1a12a0 | 599 | int i; |
0cb59c99 | 600 | |
be1a12a0 JB |
601 | for (i = 0; i < num_pages; i++) { |
602 | unlock_page(pages[i]); | |
603 | page_cache_release(pages[i]); | |
0cb59c99 | 604 | } |
2f356126 | 605 | goto out; |
0cb59c99 | 606 | } |
be1a12a0 | 607 | pages[index] = page; |
0cb59c99 JB |
608 | index++; |
609 | } | |
610 | ||
611 | index = 0; | |
612 | lock_extent_bits(&BTRFS_I(inode)->io_tree, 0, i_size_read(inode) - 1, | |
613 | 0, &cached_state, GFP_NOFS); | |
614 | ||
43be2146 JB |
615 | /* |
616 | * When searching for pinned extents, we need to start at our start | |
617 | * offset. | |
618 | */ | |
0414efae LZ |
619 | if (block_group) |
620 | start = block_group->key.objectid; | |
43be2146 | 621 | |
0cb59c99 JB |
622 | /* Write out the extent entries */ |
623 | do { | |
624 | struct btrfs_free_space_entry *entry; | |
2f356126 | 625 | void *addr, *orig; |
0cb59c99 | 626 | unsigned long offset = 0; |
0cb59c99 | 627 | |
43be2146 JB |
628 | next_page = false; |
629 | ||
be1a12a0 JB |
630 | if (index >= num_pages) { |
631 | out_of_space = true; | |
632 | break; | |
633 | } | |
634 | ||
635 | page = pages[index]; | |
0cb59c99 | 636 | |
2f356126 JB |
637 | orig = addr = kmap(page); |
638 | if (index == 0) { | |
639 | u64 *gen; | |
0cb59c99 | 640 | |
2f356126 JB |
641 | /* |
642 | * We're going to put in a bogus crc for this page to | |
643 | * make sure that old kernels who aren't aware of this | |
644 | * format will be sure to discard the cache. | |
645 | */ | |
646 | addr += sizeof(u64); | |
647 | offset += sizeof(u64); | |
648 | ||
649 | gen = addr; | |
650 | *gen = trans->transid; | |
651 | addr += sizeof(u64); | |
652 | offset += sizeof(u64); | |
653 | } | |
654 | entry = addr; | |
655 | ||
656 | memset(addr, 0, PAGE_CACHE_SIZE - offset); | |
43be2146 | 657 | while (node && !next_page) { |
0cb59c99 JB |
658 | struct btrfs_free_space *e; |
659 | ||
660 | e = rb_entry(node, struct btrfs_free_space, offset_index); | |
661 | entries++; | |
662 | ||
663 | entry->offset = cpu_to_le64(e->offset); | |
664 | entry->bytes = cpu_to_le64(e->bytes); | |
665 | if (e->bitmap) { | |
666 | entry->type = BTRFS_FREE_SPACE_BITMAP; | |
667 | list_add_tail(&e->list, &bitmap_list); | |
668 | bitmaps++; | |
669 | } else { | |
670 | entry->type = BTRFS_FREE_SPACE_EXTENT; | |
671 | } | |
672 | node = rb_next(node); | |
43be2146 JB |
673 | if (!node && cluster) { |
674 | node = rb_first(&cluster->root); | |
675 | cluster = NULL; | |
676 | } | |
0cb59c99 JB |
677 | offset += sizeof(struct btrfs_free_space_entry); |
678 | if (offset + sizeof(struct btrfs_free_space_entry) >= | |
679 | PAGE_CACHE_SIZE) | |
43be2146 JB |
680 | next_page = true; |
681 | entry++; | |
682 | } | |
683 | ||
684 | /* | |
685 | * We want to add any pinned extents to our free space cache | |
686 | * so we don't leak the space | |
687 | */ | |
0414efae LZ |
688 | while (block_group && !next_page && |
689 | (start < block_group->key.objectid + | |
690 | block_group->key.offset)) { | |
43be2146 JB |
691 | ret = find_first_extent_bit(unpin, start, &start, &end, |
692 | EXTENT_DIRTY); | |
693 | if (ret) { | |
694 | ret = 0; | |
695 | break; | |
696 | } | |
697 | ||
698 | /* This pinned extent is out of our range */ | |
699 | if (start >= block_group->key.objectid + | |
700 | block_group->key.offset) | |
0cb59c99 | 701 | break; |
43be2146 JB |
702 | |
703 | len = block_group->key.objectid + | |
704 | block_group->key.offset - start; | |
705 | len = min(len, end + 1 - start); | |
706 | ||
707 | entries++; | |
708 | entry->offset = cpu_to_le64(start); | |
709 | entry->bytes = cpu_to_le64(len); | |
710 | entry->type = BTRFS_FREE_SPACE_EXTENT; | |
711 | ||
712 | start = end + 1; | |
713 | offset += sizeof(struct btrfs_free_space_entry); | |
714 | if (offset + sizeof(struct btrfs_free_space_entry) >= | |
715 | PAGE_CACHE_SIZE) | |
716 | next_page = true; | |
0cb59c99 JB |
717 | entry++; |
718 | } | |
0cb59c99 | 719 | |
2f356126 JB |
720 | /* Generate bogus crc value */ |
721 | if (index == 0) { | |
722 | u32 *tmp; | |
723 | crc = btrfs_csum_data(root, orig + sizeof(u64), crc, | |
724 | PAGE_CACHE_SIZE - sizeof(u64)); | |
725 | btrfs_csum_final(crc, (char *)&crc); | |
726 | crc++; | |
727 | tmp = orig; | |
728 | *tmp = crc; | |
729 | } | |
730 | ||
731 | kunmap(page); | |
0cb59c99 JB |
732 | |
733 | bytes += PAGE_CACHE_SIZE; | |
734 | ||
0cb59c99 | 735 | index++; |
43be2146 | 736 | } while (node || next_page); |
0cb59c99 JB |
737 | |
738 | /* Write out the bitmaps */ | |
739 | list_for_each_safe(pos, n, &bitmap_list) { | |
740 | void *addr; | |
741 | struct btrfs_free_space *entry = | |
742 | list_entry(pos, struct btrfs_free_space, list); | |
743 | ||
be1a12a0 JB |
744 | if (index >= num_pages) { |
745 | out_of_space = true; | |
746 | break; | |
747 | } | |
f65647c2 | 748 | page = pages[index]; |
0cb59c99 JB |
749 | |
750 | addr = kmap(page); | |
751 | memcpy(addr, entry->bitmap, PAGE_CACHE_SIZE); | |
0cb59c99 | 752 | kunmap(page); |
0cb59c99 JB |
753 | bytes += PAGE_CACHE_SIZE; |
754 | ||
0cb59c99 JB |
755 | list_del_init(&entry->list); |
756 | index++; | |
757 | } | |
758 | ||
be1a12a0 JB |
759 | if (out_of_space) { |
760 | btrfs_drop_pages(pages, num_pages); | |
761 | unlock_extent_cached(&BTRFS_I(inode)->io_tree, 0, | |
762 | i_size_read(inode) - 1, &cached_state, | |
763 | GFP_NOFS); | |
764 | ret = 0; | |
2f356126 | 765 | goto out; |
be1a12a0 JB |
766 | } |
767 | ||
0cb59c99 | 768 | /* Zero out the rest of the pages just to make sure */ |
be1a12a0 | 769 | while (index < num_pages) { |
0cb59c99 JB |
770 | void *addr; |
771 | ||
be1a12a0 | 772 | page = pages[index]; |
0cb59c99 JB |
773 | addr = kmap(page); |
774 | memset(addr, 0, PAGE_CACHE_SIZE); | |
775 | kunmap(page); | |
0cb59c99 JB |
776 | bytes += PAGE_CACHE_SIZE; |
777 | index++; | |
778 | } | |
779 | ||
be1a12a0 JB |
780 | ret = btrfs_dirty_pages(root, inode, pages, num_pages, 0, |
781 | bytes, &cached_state); | |
782 | btrfs_drop_pages(pages, num_pages); | |
0cb59c99 JB |
783 | unlock_extent_cached(&BTRFS_I(inode)->io_tree, 0, |
784 | i_size_read(inode) - 1, &cached_state, GFP_NOFS); | |
785 | ||
be1a12a0 JB |
786 | if (ret) { |
787 | ret = 0; | |
2f356126 | 788 | goto out; |
be1a12a0 JB |
789 | } |
790 | ||
791 | BTRFS_I(inode)->generation = trans->transid; | |
792 | ||
0cb59c99 JB |
793 | filemap_write_and_wait(inode->i_mapping); |
794 | ||
795 | key.objectid = BTRFS_FREE_SPACE_OBJECTID; | |
0414efae | 796 | key.offset = offset; |
0cb59c99 JB |
797 | key.type = 0; |
798 | ||
799 | ret = btrfs_search_slot(trans, root, &key, path, 1, 1); | |
800 | if (ret < 0) { | |
0414efae | 801 | ret = -1; |
0cb59c99 JB |
802 | clear_extent_bit(&BTRFS_I(inode)->io_tree, 0, bytes - 1, |
803 | EXTENT_DIRTY | EXTENT_DELALLOC | | |
804 | EXTENT_DO_ACCOUNTING, 0, 0, NULL, GFP_NOFS); | |
2f356126 | 805 | goto out; |
0cb59c99 JB |
806 | } |
807 | leaf = path->nodes[0]; | |
808 | if (ret > 0) { | |
809 | struct btrfs_key found_key; | |
810 | BUG_ON(!path->slots[0]); | |
811 | path->slots[0]--; | |
812 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); | |
813 | if (found_key.objectid != BTRFS_FREE_SPACE_OBJECTID || | |
0414efae LZ |
814 | found_key.offset != offset) { |
815 | ret = -1; | |
0cb59c99 JB |
816 | clear_extent_bit(&BTRFS_I(inode)->io_tree, 0, bytes - 1, |
817 | EXTENT_DIRTY | EXTENT_DELALLOC | | |
818 | EXTENT_DO_ACCOUNTING, 0, 0, NULL, | |
819 | GFP_NOFS); | |
b3b4aa74 | 820 | btrfs_release_path(path); |
2f356126 | 821 | goto out; |
0cb59c99 JB |
822 | } |
823 | } | |
824 | header = btrfs_item_ptr(leaf, path->slots[0], | |
825 | struct btrfs_free_space_header); | |
826 | btrfs_set_free_space_entries(leaf, header, entries); | |
827 | btrfs_set_free_space_bitmaps(leaf, header, bitmaps); | |
828 | btrfs_set_free_space_generation(leaf, header, trans->transid); | |
829 | btrfs_mark_buffer_dirty(leaf); | |
b3b4aa74 | 830 | btrfs_release_path(path); |
0cb59c99 JB |
831 | |
832 | ret = 1; | |
833 | ||
2f356126 | 834 | out: |
211f96c2 | 835 | kfree(pages); |
0414efae | 836 | if (ret != 1) { |
0cb59c99 | 837 | invalidate_inode_pages2_range(inode->i_mapping, 0, index); |
0cb59c99 JB |
838 | BTRFS_I(inode)->generation = 0; |
839 | } | |
0cb59c99 | 840 | btrfs_update_inode(trans, root, inode); |
0414efae LZ |
841 | return ret; |
842 | } | |
843 | ||
844 | int btrfs_write_out_cache(struct btrfs_root *root, | |
845 | struct btrfs_trans_handle *trans, | |
846 | struct btrfs_block_group_cache *block_group, | |
847 | struct btrfs_path *path) | |
848 | { | |
849 | struct btrfs_free_space_ctl *ctl = block_group->free_space_ctl; | |
850 | struct inode *inode; | |
851 | int ret = 0; | |
852 | ||
853 | root = root->fs_info->tree_root; | |
854 | ||
855 | spin_lock(&block_group->lock); | |
856 | if (block_group->disk_cache_state < BTRFS_DC_SETUP) { | |
857 | spin_unlock(&block_group->lock); | |
858 | return 0; | |
859 | } | |
860 | spin_unlock(&block_group->lock); | |
861 | ||
862 | inode = lookup_free_space_inode(root, block_group, path); | |
863 | if (IS_ERR(inode)) | |
864 | return 0; | |
865 | ||
866 | ret = __btrfs_write_out_cache(root, inode, ctl, block_group, trans, | |
867 | path, block_group->key.objectid); | |
868 | if (ret < 0) { | |
869 | spin_lock(&block_group->lock); | |
870 | block_group->disk_cache_state = BTRFS_DC_ERROR; | |
871 | spin_unlock(&block_group->lock); | |
82d5902d | 872 | ret = 0; |
0414efae LZ |
873 | |
874 | printk(KERN_ERR "btrfs: failed to write free space cace " | |
875 | "for block group %llu\n", block_group->key.objectid); | |
876 | } | |
877 | ||
0cb59c99 JB |
878 | iput(inode); |
879 | return ret; | |
880 | } | |
881 | ||
34d52cb6 | 882 | static inline unsigned long offset_to_bit(u64 bitmap_start, u32 unit, |
96303081 | 883 | u64 offset) |
0f9dd46c | 884 | { |
96303081 JB |
885 | BUG_ON(offset < bitmap_start); |
886 | offset -= bitmap_start; | |
34d52cb6 | 887 | return (unsigned long)(div_u64(offset, unit)); |
96303081 | 888 | } |
0f9dd46c | 889 | |
34d52cb6 | 890 | static inline unsigned long bytes_to_bits(u64 bytes, u32 unit) |
96303081 | 891 | { |
34d52cb6 | 892 | return (unsigned long)(div_u64(bytes, unit)); |
96303081 | 893 | } |
0f9dd46c | 894 | |
34d52cb6 | 895 | static inline u64 offset_to_bitmap(struct btrfs_free_space_ctl *ctl, |
96303081 JB |
896 | u64 offset) |
897 | { | |
898 | u64 bitmap_start; | |
899 | u64 bytes_per_bitmap; | |
0f9dd46c | 900 | |
34d52cb6 LZ |
901 | bytes_per_bitmap = BITS_PER_BITMAP * ctl->unit; |
902 | bitmap_start = offset - ctl->start; | |
96303081 JB |
903 | bitmap_start = div64_u64(bitmap_start, bytes_per_bitmap); |
904 | bitmap_start *= bytes_per_bitmap; | |
34d52cb6 | 905 | bitmap_start += ctl->start; |
0f9dd46c | 906 | |
96303081 | 907 | return bitmap_start; |
0f9dd46c JB |
908 | } |
909 | ||
96303081 JB |
910 | static int tree_insert_offset(struct rb_root *root, u64 offset, |
911 | struct rb_node *node, int bitmap) | |
0f9dd46c JB |
912 | { |
913 | struct rb_node **p = &root->rb_node; | |
914 | struct rb_node *parent = NULL; | |
915 | struct btrfs_free_space *info; | |
916 | ||
917 | while (*p) { | |
918 | parent = *p; | |
96303081 | 919 | info = rb_entry(parent, struct btrfs_free_space, offset_index); |
0f9dd46c | 920 | |
96303081 | 921 | if (offset < info->offset) { |
0f9dd46c | 922 | p = &(*p)->rb_left; |
96303081 | 923 | } else if (offset > info->offset) { |
0f9dd46c | 924 | p = &(*p)->rb_right; |
96303081 JB |
925 | } else { |
926 | /* | |
927 | * we could have a bitmap entry and an extent entry | |
928 | * share the same offset. If this is the case, we want | |
929 | * the extent entry to always be found first if we do a | |
930 | * linear search through the tree, since we want to have | |
931 | * the quickest allocation time, and allocating from an | |
932 | * extent is faster than allocating from a bitmap. So | |
933 | * if we're inserting a bitmap and we find an entry at | |
934 | * this offset, we want to go right, or after this entry | |
935 | * logically. If we are inserting an extent and we've | |
936 | * found a bitmap, we want to go left, or before | |
937 | * logically. | |
938 | */ | |
939 | if (bitmap) { | |
207dde82 JB |
940 | if (info->bitmap) { |
941 | WARN_ON_ONCE(1); | |
942 | return -EEXIST; | |
943 | } | |
96303081 JB |
944 | p = &(*p)->rb_right; |
945 | } else { | |
207dde82 JB |
946 | if (!info->bitmap) { |
947 | WARN_ON_ONCE(1); | |
948 | return -EEXIST; | |
949 | } | |
96303081 JB |
950 | p = &(*p)->rb_left; |
951 | } | |
952 | } | |
0f9dd46c JB |
953 | } |
954 | ||
955 | rb_link_node(node, parent, p); | |
956 | rb_insert_color(node, root); | |
957 | ||
958 | return 0; | |
959 | } | |
960 | ||
961 | /* | |
70cb0743 JB |
962 | * searches the tree for the given offset. |
963 | * | |
96303081 JB |
964 | * fuzzy - If this is set, then we are trying to make an allocation, and we just |
965 | * want a section that has at least bytes size and comes at or after the given | |
966 | * offset. | |
0f9dd46c | 967 | */ |
96303081 | 968 | static struct btrfs_free_space * |
34d52cb6 | 969 | tree_search_offset(struct btrfs_free_space_ctl *ctl, |
96303081 | 970 | u64 offset, int bitmap_only, int fuzzy) |
0f9dd46c | 971 | { |
34d52cb6 | 972 | struct rb_node *n = ctl->free_space_offset.rb_node; |
96303081 JB |
973 | struct btrfs_free_space *entry, *prev = NULL; |
974 | ||
975 | /* find entry that is closest to the 'offset' */ | |
976 | while (1) { | |
977 | if (!n) { | |
978 | entry = NULL; | |
979 | break; | |
980 | } | |
0f9dd46c | 981 | |
0f9dd46c | 982 | entry = rb_entry(n, struct btrfs_free_space, offset_index); |
96303081 | 983 | prev = entry; |
0f9dd46c | 984 | |
96303081 | 985 | if (offset < entry->offset) |
0f9dd46c | 986 | n = n->rb_left; |
96303081 | 987 | else if (offset > entry->offset) |
0f9dd46c | 988 | n = n->rb_right; |
96303081 | 989 | else |
0f9dd46c | 990 | break; |
0f9dd46c JB |
991 | } |
992 | ||
96303081 JB |
993 | if (bitmap_only) { |
994 | if (!entry) | |
995 | return NULL; | |
996 | if (entry->bitmap) | |
997 | return entry; | |
0f9dd46c | 998 | |
96303081 JB |
999 | /* |
1000 | * bitmap entry and extent entry may share same offset, | |
1001 | * in that case, bitmap entry comes after extent entry. | |
1002 | */ | |
1003 | n = rb_next(n); | |
1004 | if (!n) | |
1005 | return NULL; | |
1006 | entry = rb_entry(n, struct btrfs_free_space, offset_index); | |
1007 | if (entry->offset != offset) | |
1008 | return NULL; | |
0f9dd46c | 1009 | |
96303081 JB |
1010 | WARN_ON(!entry->bitmap); |
1011 | return entry; | |
1012 | } else if (entry) { | |
1013 | if (entry->bitmap) { | |
0f9dd46c | 1014 | /* |
96303081 JB |
1015 | * if previous extent entry covers the offset, |
1016 | * we should return it instead of the bitmap entry | |
0f9dd46c | 1017 | */ |
96303081 JB |
1018 | n = &entry->offset_index; |
1019 | while (1) { | |
1020 | n = rb_prev(n); | |
1021 | if (!n) | |
1022 | break; | |
1023 | prev = rb_entry(n, struct btrfs_free_space, | |
1024 | offset_index); | |
1025 | if (!prev->bitmap) { | |
1026 | if (prev->offset + prev->bytes > offset) | |
1027 | entry = prev; | |
1028 | break; | |
1029 | } | |
0f9dd46c | 1030 | } |
96303081 JB |
1031 | } |
1032 | return entry; | |
1033 | } | |
1034 | ||
1035 | if (!prev) | |
1036 | return NULL; | |
1037 | ||
1038 | /* find last entry before the 'offset' */ | |
1039 | entry = prev; | |
1040 | if (entry->offset > offset) { | |
1041 | n = rb_prev(&entry->offset_index); | |
1042 | if (n) { | |
1043 | entry = rb_entry(n, struct btrfs_free_space, | |
1044 | offset_index); | |
1045 | BUG_ON(entry->offset > offset); | |
0f9dd46c | 1046 | } else { |
96303081 JB |
1047 | if (fuzzy) |
1048 | return entry; | |
1049 | else | |
1050 | return NULL; | |
0f9dd46c JB |
1051 | } |
1052 | } | |
1053 | ||
96303081 JB |
1054 | if (entry->bitmap) { |
1055 | n = &entry->offset_index; | |
1056 | while (1) { | |
1057 | n = rb_prev(n); | |
1058 | if (!n) | |
1059 | break; | |
1060 | prev = rb_entry(n, struct btrfs_free_space, | |
1061 | offset_index); | |
1062 | if (!prev->bitmap) { | |
1063 | if (prev->offset + prev->bytes > offset) | |
1064 | return prev; | |
1065 | break; | |
1066 | } | |
1067 | } | |
34d52cb6 | 1068 | if (entry->offset + BITS_PER_BITMAP * ctl->unit > offset) |
96303081 JB |
1069 | return entry; |
1070 | } else if (entry->offset + entry->bytes > offset) | |
1071 | return entry; | |
1072 | ||
1073 | if (!fuzzy) | |
1074 | return NULL; | |
1075 | ||
1076 | while (1) { | |
1077 | if (entry->bitmap) { | |
1078 | if (entry->offset + BITS_PER_BITMAP * | |
34d52cb6 | 1079 | ctl->unit > offset) |
96303081 JB |
1080 | break; |
1081 | } else { | |
1082 | if (entry->offset + entry->bytes > offset) | |
1083 | break; | |
1084 | } | |
1085 | ||
1086 | n = rb_next(&entry->offset_index); | |
1087 | if (!n) | |
1088 | return NULL; | |
1089 | entry = rb_entry(n, struct btrfs_free_space, offset_index); | |
1090 | } | |
1091 | return entry; | |
0f9dd46c JB |
1092 | } |
1093 | ||
f333adb5 | 1094 | static inline void |
34d52cb6 | 1095 | __unlink_free_space(struct btrfs_free_space_ctl *ctl, |
f333adb5 | 1096 | struct btrfs_free_space *info) |
0f9dd46c | 1097 | { |
34d52cb6 LZ |
1098 | rb_erase(&info->offset_index, &ctl->free_space_offset); |
1099 | ctl->free_extents--; | |
f333adb5 LZ |
1100 | } |
1101 | ||
34d52cb6 | 1102 | static void unlink_free_space(struct btrfs_free_space_ctl *ctl, |
f333adb5 LZ |
1103 | struct btrfs_free_space *info) |
1104 | { | |
34d52cb6 LZ |
1105 | __unlink_free_space(ctl, info); |
1106 | ctl->free_space -= info->bytes; | |
0f9dd46c JB |
1107 | } |
1108 | ||
34d52cb6 | 1109 | static int link_free_space(struct btrfs_free_space_ctl *ctl, |
0f9dd46c JB |
1110 | struct btrfs_free_space *info) |
1111 | { | |
1112 | int ret = 0; | |
1113 | ||
96303081 | 1114 | BUG_ON(!info->bitmap && !info->bytes); |
34d52cb6 | 1115 | ret = tree_insert_offset(&ctl->free_space_offset, info->offset, |
96303081 | 1116 | &info->offset_index, (info->bitmap != NULL)); |
0f9dd46c JB |
1117 | if (ret) |
1118 | return ret; | |
1119 | ||
34d52cb6 LZ |
1120 | ctl->free_space += info->bytes; |
1121 | ctl->free_extents++; | |
96303081 JB |
1122 | return ret; |
1123 | } | |
1124 | ||
34d52cb6 | 1125 | static void recalculate_thresholds(struct btrfs_free_space_ctl *ctl) |
96303081 | 1126 | { |
34d52cb6 | 1127 | struct btrfs_block_group_cache *block_group = ctl->private; |
25891f79 JB |
1128 | u64 max_bytes; |
1129 | u64 bitmap_bytes; | |
1130 | u64 extent_bytes; | |
8eb2d829 | 1131 | u64 size = block_group->key.offset; |
34d52cb6 LZ |
1132 | u64 bytes_per_bg = BITS_PER_BITMAP * block_group->sectorsize; |
1133 | int max_bitmaps = div64_u64(size + bytes_per_bg - 1, bytes_per_bg); | |
1134 | ||
1135 | BUG_ON(ctl->total_bitmaps > max_bitmaps); | |
96303081 JB |
1136 | |
1137 | /* | |
1138 | * The goal is to keep the total amount of memory used per 1gb of space | |
1139 | * at or below 32k, so we need to adjust how much memory we allow to be | |
1140 | * used by extent based free space tracking | |
1141 | */ | |
8eb2d829 LZ |
1142 | if (size < 1024 * 1024 * 1024) |
1143 | max_bytes = MAX_CACHE_BYTES_PER_GIG; | |
1144 | else | |
1145 | max_bytes = MAX_CACHE_BYTES_PER_GIG * | |
1146 | div64_u64(size, 1024 * 1024 * 1024); | |
96303081 | 1147 | |
25891f79 JB |
1148 | /* |
1149 | * we want to account for 1 more bitmap than what we have so we can make | |
1150 | * sure we don't go over our overall goal of MAX_CACHE_BYTES_PER_GIG as | |
1151 | * we add more bitmaps. | |
1152 | */ | |
34d52cb6 | 1153 | bitmap_bytes = (ctl->total_bitmaps + 1) * PAGE_CACHE_SIZE; |
96303081 | 1154 | |
25891f79 | 1155 | if (bitmap_bytes >= max_bytes) { |
34d52cb6 | 1156 | ctl->extents_thresh = 0; |
25891f79 JB |
1157 | return; |
1158 | } | |
96303081 | 1159 | |
25891f79 JB |
1160 | /* |
1161 | * we want the extent entry threshold to always be at most 1/2 the maxw | |
1162 | * bytes we can have, or whatever is less than that. | |
1163 | */ | |
1164 | extent_bytes = max_bytes - bitmap_bytes; | |
1165 | extent_bytes = min_t(u64, extent_bytes, div64_u64(max_bytes, 2)); | |
96303081 | 1166 | |
34d52cb6 | 1167 | ctl->extents_thresh = |
25891f79 | 1168 | div64_u64(extent_bytes, (sizeof(struct btrfs_free_space))); |
96303081 JB |
1169 | } |
1170 | ||
bb3ac5a4 MX |
1171 | static inline void __bitmap_clear_bits(struct btrfs_free_space_ctl *ctl, |
1172 | struct btrfs_free_space *info, | |
1173 | u64 offset, u64 bytes) | |
96303081 | 1174 | { |
f38b6e75 | 1175 | unsigned long start, count; |
96303081 | 1176 | |
34d52cb6 LZ |
1177 | start = offset_to_bit(info->offset, ctl->unit, offset); |
1178 | count = bytes_to_bits(bytes, ctl->unit); | |
f38b6e75 | 1179 | BUG_ON(start + count > BITS_PER_BITMAP); |
96303081 | 1180 | |
f38b6e75 | 1181 | bitmap_clear(info->bitmap, start, count); |
96303081 JB |
1182 | |
1183 | info->bytes -= bytes; | |
bb3ac5a4 MX |
1184 | } |
1185 | ||
1186 | static void bitmap_clear_bits(struct btrfs_free_space_ctl *ctl, | |
1187 | struct btrfs_free_space *info, u64 offset, | |
1188 | u64 bytes) | |
1189 | { | |
1190 | __bitmap_clear_bits(ctl, info, offset, bytes); | |
34d52cb6 | 1191 | ctl->free_space -= bytes; |
96303081 JB |
1192 | } |
1193 | ||
34d52cb6 | 1194 | static void bitmap_set_bits(struct btrfs_free_space_ctl *ctl, |
817d52f8 JB |
1195 | struct btrfs_free_space *info, u64 offset, |
1196 | u64 bytes) | |
96303081 | 1197 | { |
f38b6e75 | 1198 | unsigned long start, count; |
96303081 | 1199 | |
34d52cb6 LZ |
1200 | start = offset_to_bit(info->offset, ctl->unit, offset); |
1201 | count = bytes_to_bits(bytes, ctl->unit); | |
f38b6e75 | 1202 | BUG_ON(start + count > BITS_PER_BITMAP); |
96303081 | 1203 | |
f38b6e75 | 1204 | bitmap_set(info->bitmap, start, count); |
96303081 JB |
1205 | |
1206 | info->bytes += bytes; | |
34d52cb6 | 1207 | ctl->free_space += bytes; |
96303081 JB |
1208 | } |
1209 | ||
34d52cb6 | 1210 | static int search_bitmap(struct btrfs_free_space_ctl *ctl, |
96303081 JB |
1211 | struct btrfs_free_space *bitmap_info, u64 *offset, |
1212 | u64 *bytes) | |
1213 | { | |
1214 | unsigned long found_bits = 0; | |
1215 | unsigned long bits, i; | |
1216 | unsigned long next_zero; | |
1217 | ||
34d52cb6 | 1218 | i = offset_to_bit(bitmap_info->offset, ctl->unit, |
96303081 | 1219 | max_t(u64, *offset, bitmap_info->offset)); |
34d52cb6 | 1220 | bits = bytes_to_bits(*bytes, ctl->unit); |
96303081 JB |
1221 | |
1222 | for (i = find_next_bit(bitmap_info->bitmap, BITS_PER_BITMAP, i); | |
1223 | i < BITS_PER_BITMAP; | |
1224 | i = find_next_bit(bitmap_info->bitmap, BITS_PER_BITMAP, i + 1)) { | |
1225 | next_zero = find_next_zero_bit(bitmap_info->bitmap, | |
1226 | BITS_PER_BITMAP, i); | |
1227 | if ((next_zero - i) >= bits) { | |
1228 | found_bits = next_zero - i; | |
1229 | break; | |
1230 | } | |
1231 | i = next_zero; | |
1232 | } | |
1233 | ||
1234 | if (found_bits) { | |
34d52cb6 LZ |
1235 | *offset = (u64)(i * ctl->unit) + bitmap_info->offset; |
1236 | *bytes = (u64)(found_bits) * ctl->unit; | |
96303081 JB |
1237 | return 0; |
1238 | } | |
1239 | ||
1240 | return -1; | |
1241 | } | |
1242 | ||
34d52cb6 LZ |
1243 | static struct btrfs_free_space * |
1244 | find_free_space(struct btrfs_free_space_ctl *ctl, u64 *offset, u64 *bytes) | |
96303081 JB |
1245 | { |
1246 | struct btrfs_free_space *entry; | |
1247 | struct rb_node *node; | |
1248 | int ret; | |
1249 | ||
34d52cb6 | 1250 | if (!ctl->free_space_offset.rb_node) |
96303081 JB |
1251 | return NULL; |
1252 | ||
34d52cb6 | 1253 | entry = tree_search_offset(ctl, offset_to_bitmap(ctl, *offset), 0, 1); |
96303081 JB |
1254 | if (!entry) |
1255 | return NULL; | |
1256 | ||
1257 | for (node = &entry->offset_index; node; node = rb_next(node)) { | |
1258 | entry = rb_entry(node, struct btrfs_free_space, offset_index); | |
1259 | if (entry->bytes < *bytes) | |
1260 | continue; | |
1261 | ||
1262 | if (entry->bitmap) { | |
34d52cb6 | 1263 | ret = search_bitmap(ctl, entry, offset, bytes); |
96303081 JB |
1264 | if (!ret) |
1265 | return entry; | |
1266 | continue; | |
1267 | } | |
1268 | ||
1269 | *offset = entry->offset; | |
1270 | *bytes = entry->bytes; | |
1271 | return entry; | |
1272 | } | |
1273 | ||
1274 | return NULL; | |
1275 | } | |
1276 | ||
34d52cb6 | 1277 | static void add_new_bitmap(struct btrfs_free_space_ctl *ctl, |
96303081 JB |
1278 | struct btrfs_free_space *info, u64 offset) |
1279 | { | |
34d52cb6 | 1280 | info->offset = offset_to_bitmap(ctl, offset); |
f019f426 | 1281 | info->bytes = 0; |
34d52cb6 LZ |
1282 | link_free_space(ctl, info); |
1283 | ctl->total_bitmaps++; | |
96303081 | 1284 | |
34d52cb6 | 1285 | ctl->op->recalc_thresholds(ctl); |
96303081 JB |
1286 | } |
1287 | ||
34d52cb6 | 1288 | static void free_bitmap(struct btrfs_free_space_ctl *ctl, |
edf6e2d1 LZ |
1289 | struct btrfs_free_space *bitmap_info) |
1290 | { | |
34d52cb6 | 1291 | unlink_free_space(ctl, bitmap_info); |
edf6e2d1 | 1292 | kfree(bitmap_info->bitmap); |
dc89e982 | 1293 | kmem_cache_free(btrfs_free_space_cachep, bitmap_info); |
34d52cb6 LZ |
1294 | ctl->total_bitmaps--; |
1295 | ctl->op->recalc_thresholds(ctl); | |
edf6e2d1 LZ |
1296 | } |
1297 | ||
34d52cb6 | 1298 | static noinline int remove_from_bitmap(struct btrfs_free_space_ctl *ctl, |
96303081 JB |
1299 | struct btrfs_free_space *bitmap_info, |
1300 | u64 *offset, u64 *bytes) | |
1301 | { | |
1302 | u64 end; | |
6606bb97 JB |
1303 | u64 search_start, search_bytes; |
1304 | int ret; | |
96303081 JB |
1305 | |
1306 | again: | |
34d52cb6 | 1307 | end = bitmap_info->offset + (u64)(BITS_PER_BITMAP * ctl->unit) - 1; |
96303081 | 1308 | |
6606bb97 JB |
1309 | /* |
1310 | * XXX - this can go away after a few releases. | |
1311 | * | |
1312 | * since the only user of btrfs_remove_free_space is the tree logging | |
1313 | * stuff, and the only way to test that is under crash conditions, we | |
1314 | * want to have this debug stuff here just in case somethings not | |
1315 | * working. Search the bitmap for the space we are trying to use to | |
1316 | * make sure its actually there. If its not there then we need to stop | |
1317 | * because something has gone wrong. | |
1318 | */ | |
1319 | search_start = *offset; | |
1320 | search_bytes = *bytes; | |
13dbc089 | 1321 | search_bytes = min(search_bytes, end - search_start + 1); |
34d52cb6 | 1322 | ret = search_bitmap(ctl, bitmap_info, &search_start, &search_bytes); |
6606bb97 JB |
1323 | BUG_ON(ret < 0 || search_start != *offset); |
1324 | ||
96303081 | 1325 | if (*offset > bitmap_info->offset && *offset + *bytes > end) { |
34d52cb6 | 1326 | bitmap_clear_bits(ctl, bitmap_info, *offset, end - *offset + 1); |
96303081 JB |
1327 | *bytes -= end - *offset + 1; |
1328 | *offset = end + 1; | |
1329 | } else if (*offset >= bitmap_info->offset && *offset + *bytes <= end) { | |
34d52cb6 | 1330 | bitmap_clear_bits(ctl, bitmap_info, *offset, *bytes); |
96303081 JB |
1331 | *bytes = 0; |
1332 | } | |
1333 | ||
1334 | if (*bytes) { | |
6606bb97 | 1335 | struct rb_node *next = rb_next(&bitmap_info->offset_index); |
edf6e2d1 | 1336 | if (!bitmap_info->bytes) |
34d52cb6 | 1337 | free_bitmap(ctl, bitmap_info); |
96303081 | 1338 | |
6606bb97 JB |
1339 | /* |
1340 | * no entry after this bitmap, but we still have bytes to | |
1341 | * remove, so something has gone wrong. | |
1342 | */ | |
1343 | if (!next) | |
96303081 JB |
1344 | return -EINVAL; |
1345 | ||
6606bb97 JB |
1346 | bitmap_info = rb_entry(next, struct btrfs_free_space, |
1347 | offset_index); | |
1348 | ||
1349 | /* | |
1350 | * if the next entry isn't a bitmap we need to return to let the | |
1351 | * extent stuff do its work. | |
1352 | */ | |
96303081 JB |
1353 | if (!bitmap_info->bitmap) |
1354 | return -EAGAIN; | |
1355 | ||
6606bb97 JB |
1356 | /* |
1357 | * Ok the next item is a bitmap, but it may not actually hold | |
1358 | * the information for the rest of this free space stuff, so | |
1359 | * look for it, and if we don't find it return so we can try | |
1360 | * everything over again. | |
1361 | */ | |
1362 | search_start = *offset; | |
1363 | search_bytes = *bytes; | |
34d52cb6 | 1364 | ret = search_bitmap(ctl, bitmap_info, &search_start, |
6606bb97 JB |
1365 | &search_bytes); |
1366 | if (ret < 0 || search_start != *offset) | |
1367 | return -EAGAIN; | |
1368 | ||
96303081 | 1369 | goto again; |
edf6e2d1 | 1370 | } else if (!bitmap_info->bytes) |
34d52cb6 | 1371 | free_bitmap(ctl, bitmap_info); |
96303081 JB |
1372 | |
1373 | return 0; | |
1374 | } | |
1375 | ||
2cdc342c JB |
1376 | static u64 add_bytes_to_bitmap(struct btrfs_free_space_ctl *ctl, |
1377 | struct btrfs_free_space *info, u64 offset, | |
1378 | u64 bytes) | |
1379 | { | |
1380 | u64 bytes_to_set = 0; | |
1381 | u64 end; | |
1382 | ||
1383 | end = info->offset + (u64)(BITS_PER_BITMAP * ctl->unit); | |
1384 | ||
1385 | bytes_to_set = min(end - offset, bytes); | |
1386 | ||
1387 | bitmap_set_bits(ctl, info, offset, bytes_to_set); | |
1388 | ||
1389 | return bytes_to_set; | |
1390 | ||
1391 | } | |
1392 | ||
34d52cb6 LZ |
1393 | static bool use_bitmap(struct btrfs_free_space_ctl *ctl, |
1394 | struct btrfs_free_space *info) | |
96303081 | 1395 | { |
34d52cb6 | 1396 | struct btrfs_block_group_cache *block_group = ctl->private; |
96303081 JB |
1397 | |
1398 | /* | |
1399 | * If we are below the extents threshold then we can add this as an | |
1400 | * extent, and don't have to deal with the bitmap | |
1401 | */ | |
34d52cb6 | 1402 | if (ctl->free_extents < ctl->extents_thresh) { |
32cb0840 JB |
1403 | /* |
1404 | * If this block group has some small extents we don't want to | |
1405 | * use up all of our free slots in the cache with them, we want | |
1406 | * to reserve them to larger extents, however if we have plent | |
1407 | * of cache left then go ahead an dadd them, no sense in adding | |
1408 | * the overhead of a bitmap if we don't have to. | |
1409 | */ | |
1410 | if (info->bytes <= block_group->sectorsize * 4) { | |
34d52cb6 LZ |
1411 | if (ctl->free_extents * 2 <= ctl->extents_thresh) |
1412 | return false; | |
32cb0840 | 1413 | } else { |
34d52cb6 | 1414 | return false; |
32cb0840 JB |
1415 | } |
1416 | } | |
96303081 JB |
1417 | |
1418 | /* | |
1419 | * some block groups are so tiny they can't be enveloped by a bitmap, so | |
1420 | * don't even bother to create a bitmap for this | |
1421 | */ | |
1422 | if (BITS_PER_BITMAP * block_group->sectorsize > | |
1423 | block_group->key.offset) | |
34d52cb6 LZ |
1424 | return false; |
1425 | ||
1426 | return true; | |
1427 | } | |
1428 | ||
2cdc342c JB |
1429 | static struct btrfs_free_space_op free_space_op = { |
1430 | .recalc_thresholds = recalculate_thresholds, | |
1431 | .use_bitmap = use_bitmap, | |
1432 | }; | |
1433 | ||
34d52cb6 LZ |
1434 | static int insert_into_bitmap(struct btrfs_free_space_ctl *ctl, |
1435 | struct btrfs_free_space *info) | |
1436 | { | |
1437 | struct btrfs_free_space *bitmap_info; | |
2cdc342c | 1438 | struct btrfs_block_group_cache *block_group = NULL; |
34d52cb6 | 1439 | int added = 0; |
2cdc342c | 1440 | u64 bytes, offset, bytes_added; |
34d52cb6 | 1441 | int ret; |
96303081 JB |
1442 | |
1443 | bytes = info->bytes; | |
1444 | offset = info->offset; | |
1445 | ||
34d52cb6 LZ |
1446 | if (!ctl->op->use_bitmap(ctl, info)) |
1447 | return 0; | |
1448 | ||
2cdc342c JB |
1449 | if (ctl->op == &free_space_op) |
1450 | block_group = ctl->private; | |
38e87880 | 1451 | again: |
2cdc342c JB |
1452 | /* |
1453 | * Since we link bitmaps right into the cluster we need to see if we | |
1454 | * have a cluster here, and if so and it has our bitmap we need to add | |
1455 | * the free space to that bitmap. | |
1456 | */ | |
1457 | if (block_group && !list_empty(&block_group->cluster_list)) { | |
1458 | struct btrfs_free_cluster *cluster; | |
1459 | struct rb_node *node; | |
1460 | struct btrfs_free_space *entry; | |
1461 | ||
1462 | cluster = list_entry(block_group->cluster_list.next, | |
1463 | struct btrfs_free_cluster, | |
1464 | block_group_list); | |
1465 | spin_lock(&cluster->lock); | |
1466 | node = rb_first(&cluster->root); | |
1467 | if (!node) { | |
1468 | spin_unlock(&cluster->lock); | |
38e87880 | 1469 | goto no_cluster_bitmap; |
2cdc342c JB |
1470 | } |
1471 | ||
1472 | entry = rb_entry(node, struct btrfs_free_space, offset_index); | |
1473 | if (!entry->bitmap) { | |
1474 | spin_unlock(&cluster->lock); | |
38e87880 | 1475 | goto no_cluster_bitmap; |
2cdc342c JB |
1476 | } |
1477 | ||
1478 | if (entry->offset == offset_to_bitmap(ctl, offset)) { | |
1479 | bytes_added = add_bytes_to_bitmap(ctl, entry, | |
1480 | offset, bytes); | |
1481 | bytes -= bytes_added; | |
1482 | offset += bytes_added; | |
1483 | } | |
1484 | spin_unlock(&cluster->lock); | |
1485 | if (!bytes) { | |
1486 | ret = 1; | |
1487 | goto out; | |
1488 | } | |
1489 | } | |
38e87880 CM |
1490 | |
1491 | no_cluster_bitmap: | |
34d52cb6 | 1492 | bitmap_info = tree_search_offset(ctl, offset_to_bitmap(ctl, offset), |
96303081 JB |
1493 | 1, 0); |
1494 | if (!bitmap_info) { | |
1495 | BUG_ON(added); | |
1496 | goto new_bitmap; | |
1497 | } | |
1498 | ||
2cdc342c JB |
1499 | bytes_added = add_bytes_to_bitmap(ctl, bitmap_info, offset, bytes); |
1500 | bytes -= bytes_added; | |
1501 | offset += bytes_added; | |
1502 | added = 0; | |
96303081 JB |
1503 | |
1504 | if (!bytes) { | |
1505 | ret = 1; | |
1506 | goto out; | |
1507 | } else | |
1508 | goto again; | |
1509 | ||
1510 | new_bitmap: | |
1511 | if (info && info->bitmap) { | |
34d52cb6 | 1512 | add_new_bitmap(ctl, info, offset); |
96303081 JB |
1513 | added = 1; |
1514 | info = NULL; | |
1515 | goto again; | |
1516 | } else { | |
34d52cb6 | 1517 | spin_unlock(&ctl->tree_lock); |
96303081 JB |
1518 | |
1519 | /* no pre-allocated info, allocate a new one */ | |
1520 | if (!info) { | |
dc89e982 JB |
1521 | info = kmem_cache_zalloc(btrfs_free_space_cachep, |
1522 | GFP_NOFS); | |
96303081 | 1523 | if (!info) { |
34d52cb6 | 1524 | spin_lock(&ctl->tree_lock); |
96303081 JB |
1525 | ret = -ENOMEM; |
1526 | goto out; | |
1527 | } | |
1528 | } | |
1529 | ||
1530 | /* allocate the bitmap */ | |
1531 | info->bitmap = kzalloc(PAGE_CACHE_SIZE, GFP_NOFS); | |
34d52cb6 | 1532 | spin_lock(&ctl->tree_lock); |
96303081 JB |
1533 | if (!info->bitmap) { |
1534 | ret = -ENOMEM; | |
1535 | goto out; | |
1536 | } | |
1537 | goto again; | |
1538 | } | |
1539 | ||
1540 | out: | |
1541 | if (info) { | |
1542 | if (info->bitmap) | |
1543 | kfree(info->bitmap); | |
dc89e982 | 1544 | kmem_cache_free(btrfs_free_space_cachep, info); |
96303081 | 1545 | } |
0f9dd46c JB |
1546 | |
1547 | return ret; | |
1548 | } | |
1549 | ||
945d8962 | 1550 | static bool try_merge_free_space(struct btrfs_free_space_ctl *ctl, |
f333adb5 | 1551 | struct btrfs_free_space *info, bool update_stat) |
0f9dd46c | 1552 | { |
120d66ee LZ |
1553 | struct btrfs_free_space *left_info; |
1554 | struct btrfs_free_space *right_info; | |
1555 | bool merged = false; | |
1556 | u64 offset = info->offset; | |
1557 | u64 bytes = info->bytes; | |
6226cb0a | 1558 | |
0f9dd46c JB |
1559 | /* |
1560 | * first we want to see if there is free space adjacent to the range we | |
1561 | * are adding, if there is remove that struct and add a new one to | |
1562 | * cover the entire range | |
1563 | */ | |
34d52cb6 | 1564 | right_info = tree_search_offset(ctl, offset + bytes, 0, 0); |
96303081 JB |
1565 | if (right_info && rb_prev(&right_info->offset_index)) |
1566 | left_info = rb_entry(rb_prev(&right_info->offset_index), | |
1567 | struct btrfs_free_space, offset_index); | |
1568 | else | |
34d52cb6 | 1569 | left_info = tree_search_offset(ctl, offset - 1, 0, 0); |
0f9dd46c | 1570 | |
96303081 | 1571 | if (right_info && !right_info->bitmap) { |
f333adb5 | 1572 | if (update_stat) |
34d52cb6 | 1573 | unlink_free_space(ctl, right_info); |
f333adb5 | 1574 | else |
34d52cb6 | 1575 | __unlink_free_space(ctl, right_info); |
6226cb0a | 1576 | info->bytes += right_info->bytes; |
dc89e982 | 1577 | kmem_cache_free(btrfs_free_space_cachep, right_info); |
120d66ee | 1578 | merged = true; |
0f9dd46c JB |
1579 | } |
1580 | ||
96303081 JB |
1581 | if (left_info && !left_info->bitmap && |
1582 | left_info->offset + left_info->bytes == offset) { | |
f333adb5 | 1583 | if (update_stat) |
34d52cb6 | 1584 | unlink_free_space(ctl, left_info); |
f333adb5 | 1585 | else |
34d52cb6 | 1586 | __unlink_free_space(ctl, left_info); |
6226cb0a JB |
1587 | info->offset = left_info->offset; |
1588 | info->bytes += left_info->bytes; | |
dc89e982 | 1589 | kmem_cache_free(btrfs_free_space_cachep, left_info); |
120d66ee | 1590 | merged = true; |
0f9dd46c JB |
1591 | } |
1592 | ||
120d66ee LZ |
1593 | return merged; |
1594 | } | |
1595 | ||
581bb050 LZ |
1596 | int __btrfs_add_free_space(struct btrfs_free_space_ctl *ctl, |
1597 | u64 offset, u64 bytes) | |
120d66ee LZ |
1598 | { |
1599 | struct btrfs_free_space *info; | |
1600 | int ret = 0; | |
1601 | ||
dc89e982 | 1602 | info = kmem_cache_zalloc(btrfs_free_space_cachep, GFP_NOFS); |
120d66ee LZ |
1603 | if (!info) |
1604 | return -ENOMEM; | |
1605 | ||
1606 | info->offset = offset; | |
1607 | info->bytes = bytes; | |
1608 | ||
34d52cb6 | 1609 | spin_lock(&ctl->tree_lock); |
120d66ee | 1610 | |
34d52cb6 | 1611 | if (try_merge_free_space(ctl, info, true)) |
120d66ee LZ |
1612 | goto link; |
1613 | ||
1614 | /* | |
1615 | * There was no extent directly to the left or right of this new | |
1616 | * extent then we know we're going to have to allocate a new extent, so | |
1617 | * before we do that see if we need to drop this into a bitmap | |
1618 | */ | |
34d52cb6 | 1619 | ret = insert_into_bitmap(ctl, info); |
120d66ee LZ |
1620 | if (ret < 0) { |
1621 | goto out; | |
1622 | } else if (ret) { | |
1623 | ret = 0; | |
1624 | goto out; | |
1625 | } | |
1626 | link: | |
34d52cb6 | 1627 | ret = link_free_space(ctl, info); |
0f9dd46c | 1628 | if (ret) |
dc89e982 | 1629 | kmem_cache_free(btrfs_free_space_cachep, info); |
96303081 | 1630 | out: |
34d52cb6 | 1631 | spin_unlock(&ctl->tree_lock); |
6226cb0a | 1632 | |
0f9dd46c | 1633 | if (ret) { |
96303081 | 1634 | printk(KERN_CRIT "btrfs: unable to add free space :%d\n", ret); |
c293498b | 1635 | BUG_ON(ret == -EEXIST); |
0f9dd46c JB |
1636 | } |
1637 | ||
0f9dd46c JB |
1638 | return ret; |
1639 | } | |
1640 | ||
6226cb0a JB |
1641 | int btrfs_remove_free_space(struct btrfs_block_group_cache *block_group, |
1642 | u64 offset, u64 bytes) | |
0f9dd46c | 1643 | { |
34d52cb6 | 1644 | struct btrfs_free_space_ctl *ctl = block_group->free_space_ctl; |
0f9dd46c | 1645 | struct btrfs_free_space *info; |
96303081 | 1646 | struct btrfs_free_space *next_info = NULL; |
0f9dd46c JB |
1647 | int ret = 0; |
1648 | ||
34d52cb6 | 1649 | spin_lock(&ctl->tree_lock); |
6226cb0a | 1650 | |
96303081 | 1651 | again: |
34d52cb6 | 1652 | info = tree_search_offset(ctl, offset, 0, 0); |
96303081 | 1653 | if (!info) { |
6606bb97 JB |
1654 | /* |
1655 | * oops didn't find an extent that matched the space we wanted | |
1656 | * to remove, look for a bitmap instead | |
1657 | */ | |
34d52cb6 | 1658 | info = tree_search_offset(ctl, offset_to_bitmap(ctl, offset), |
6606bb97 JB |
1659 | 1, 0); |
1660 | if (!info) { | |
1661 | WARN_ON(1); | |
1662 | goto out_lock; | |
1663 | } | |
96303081 JB |
1664 | } |
1665 | ||
1666 | if (info->bytes < bytes && rb_next(&info->offset_index)) { | |
1667 | u64 end; | |
1668 | next_info = rb_entry(rb_next(&info->offset_index), | |
1669 | struct btrfs_free_space, | |
1670 | offset_index); | |
1671 | ||
1672 | if (next_info->bitmap) | |
34d52cb6 LZ |
1673 | end = next_info->offset + |
1674 | BITS_PER_BITMAP * ctl->unit - 1; | |
96303081 JB |
1675 | else |
1676 | end = next_info->offset + next_info->bytes; | |
1677 | ||
1678 | if (next_info->bytes < bytes || | |
1679 | next_info->offset > offset || offset > end) { | |
1680 | printk(KERN_CRIT "Found free space at %llu, size %llu," | |
1681 | " trying to use %llu\n", | |
1682 | (unsigned long long)info->offset, | |
1683 | (unsigned long long)info->bytes, | |
1684 | (unsigned long long)bytes); | |
0f9dd46c JB |
1685 | WARN_ON(1); |
1686 | ret = -EINVAL; | |
96303081 | 1687 | goto out_lock; |
0f9dd46c | 1688 | } |
0f9dd46c | 1689 | |
96303081 JB |
1690 | info = next_info; |
1691 | } | |
1692 | ||
1693 | if (info->bytes == bytes) { | |
34d52cb6 | 1694 | unlink_free_space(ctl, info); |
96303081 JB |
1695 | if (info->bitmap) { |
1696 | kfree(info->bitmap); | |
34d52cb6 | 1697 | ctl->total_bitmaps--; |
0f9dd46c | 1698 | } |
dc89e982 | 1699 | kmem_cache_free(btrfs_free_space_cachep, info); |
96303081 JB |
1700 | goto out_lock; |
1701 | } | |
0f9dd46c | 1702 | |
96303081 | 1703 | if (!info->bitmap && info->offset == offset) { |
34d52cb6 | 1704 | unlink_free_space(ctl, info); |
0f9dd46c JB |
1705 | info->offset += bytes; |
1706 | info->bytes -= bytes; | |
34d52cb6 | 1707 | link_free_space(ctl, info); |
96303081 JB |
1708 | goto out_lock; |
1709 | } | |
0f9dd46c | 1710 | |
96303081 JB |
1711 | if (!info->bitmap && info->offset <= offset && |
1712 | info->offset + info->bytes >= offset + bytes) { | |
9b49c9b9 CM |
1713 | u64 old_start = info->offset; |
1714 | /* | |
1715 | * we're freeing space in the middle of the info, | |
1716 | * this can happen during tree log replay | |
1717 | * | |
1718 | * first unlink the old info and then | |
1719 | * insert it again after the hole we're creating | |
1720 | */ | |
34d52cb6 | 1721 | unlink_free_space(ctl, info); |
9b49c9b9 CM |
1722 | if (offset + bytes < info->offset + info->bytes) { |
1723 | u64 old_end = info->offset + info->bytes; | |
1724 | ||
1725 | info->offset = offset + bytes; | |
1726 | info->bytes = old_end - info->offset; | |
34d52cb6 | 1727 | ret = link_free_space(ctl, info); |
96303081 JB |
1728 | WARN_ON(ret); |
1729 | if (ret) | |
1730 | goto out_lock; | |
9b49c9b9 CM |
1731 | } else { |
1732 | /* the hole we're creating ends at the end | |
1733 | * of the info struct, just free the info | |
1734 | */ | |
dc89e982 | 1735 | kmem_cache_free(btrfs_free_space_cachep, info); |
9b49c9b9 | 1736 | } |
34d52cb6 | 1737 | spin_unlock(&ctl->tree_lock); |
96303081 JB |
1738 | |
1739 | /* step two, insert a new info struct to cover | |
1740 | * anything before the hole | |
9b49c9b9 | 1741 | */ |
6226cb0a JB |
1742 | ret = btrfs_add_free_space(block_group, old_start, |
1743 | offset - old_start); | |
96303081 JB |
1744 | WARN_ON(ret); |
1745 | goto out; | |
0f9dd46c | 1746 | } |
96303081 | 1747 | |
34d52cb6 | 1748 | ret = remove_from_bitmap(ctl, info, &offset, &bytes); |
96303081 JB |
1749 | if (ret == -EAGAIN) |
1750 | goto again; | |
1751 | BUG_ON(ret); | |
1752 | out_lock: | |
34d52cb6 | 1753 | spin_unlock(&ctl->tree_lock); |
0f9dd46c | 1754 | out: |
25179201 JB |
1755 | return ret; |
1756 | } | |
1757 | ||
0f9dd46c JB |
1758 | void btrfs_dump_free_space(struct btrfs_block_group_cache *block_group, |
1759 | u64 bytes) | |
1760 | { | |
34d52cb6 | 1761 | struct btrfs_free_space_ctl *ctl = block_group->free_space_ctl; |
0f9dd46c JB |
1762 | struct btrfs_free_space *info; |
1763 | struct rb_node *n; | |
1764 | int count = 0; | |
1765 | ||
34d52cb6 | 1766 | for (n = rb_first(&ctl->free_space_offset); n; n = rb_next(n)) { |
0f9dd46c JB |
1767 | info = rb_entry(n, struct btrfs_free_space, offset_index); |
1768 | if (info->bytes >= bytes) | |
1769 | count++; | |
96303081 | 1770 | printk(KERN_CRIT "entry offset %llu, bytes %llu, bitmap %s\n", |
21380931 | 1771 | (unsigned long long)info->offset, |
96303081 JB |
1772 | (unsigned long long)info->bytes, |
1773 | (info->bitmap) ? "yes" : "no"); | |
0f9dd46c | 1774 | } |
96303081 JB |
1775 | printk(KERN_INFO "block group has cluster?: %s\n", |
1776 | list_empty(&block_group->cluster_list) ? "no" : "yes"); | |
0f9dd46c JB |
1777 | printk(KERN_INFO "%d blocks of free space at or bigger than bytes is" |
1778 | "\n", count); | |
1779 | } | |
1780 | ||
34d52cb6 | 1781 | void btrfs_init_free_space_ctl(struct btrfs_block_group_cache *block_group) |
0f9dd46c | 1782 | { |
34d52cb6 | 1783 | struct btrfs_free_space_ctl *ctl = block_group->free_space_ctl; |
0f9dd46c | 1784 | |
34d52cb6 LZ |
1785 | spin_lock_init(&ctl->tree_lock); |
1786 | ctl->unit = block_group->sectorsize; | |
1787 | ctl->start = block_group->key.objectid; | |
1788 | ctl->private = block_group; | |
1789 | ctl->op = &free_space_op; | |
0f9dd46c | 1790 | |
34d52cb6 LZ |
1791 | /* |
1792 | * we only want to have 32k of ram per block group for keeping | |
1793 | * track of free space, and if we pass 1/2 of that we want to | |
1794 | * start converting things over to using bitmaps | |
1795 | */ | |
1796 | ctl->extents_thresh = ((1024 * 32) / 2) / | |
1797 | sizeof(struct btrfs_free_space); | |
0f9dd46c JB |
1798 | } |
1799 | ||
fa9c0d79 CM |
1800 | /* |
1801 | * for a given cluster, put all of its extents back into the free | |
1802 | * space cache. If the block group passed doesn't match the block group | |
1803 | * pointed to by the cluster, someone else raced in and freed the | |
1804 | * cluster already. In that case, we just return without changing anything | |
1805 | */ | |
1806 | static int | |
1807 | __btrfs_return_cluster_to_free_space( | |
1808 | struct btrfs_block_group_cache *block_group, | |
1809 | struct btrfs_free_cluster *cluster) | |
1810 | { | |
34d52cb6 | 1811 | struct btrfs_free_space_ctl *ctl = block_group->free_space_ctl; |
fa9c0d79 CM |
1812 | struct btrfs_free_space *entry; |
1813 | struct rb_node *node; | |
1814 | ||
1815 | spin_lock(&cluster->lock); | |
1816 | if (cluster->block_group != block_group) | |
1817 | goto out; | |
1818 | ||
96303081 | 1819 | cluster->block_group = NULL; |
fa9c0d79 | 1820 | cluster->window_start = 0; |
96303081 | 1821 | list_del_init(&cluster->block_group_list); |
96303081 | 1822 | |
fa9c0d79 | 1823 | node = rb_first(&cluster->root); |
96303081 | 1824 | while (node) { |
4e69b598 JB |
1825 | bool bitmap; |
1826 | ||
fa9c0d79 CM |
1827 | entry = rb_entry(node, struct btrfs_free_space, offset_index); |
1828 | node = rb_next(&entry->offset_index); | |
1829 | rb_erase(&entry->offset_index, &cluster->root); | |
4e69b598 JB |
1830 | |
1831 | bitmap = (entry->bitmap != NULL); | |
1832 | if (!bitmap) | |
34d52cb6 LZ |
1833 | try_merge_free_space(ctl, entry, false); |
1834 | tree_insert_offset(&ctl->free_space_offset, | |
4e69b598 | 1835 | entry->offset, &entry->offset_index, bitmap); |
fa9c0d79 | 1836 | } |
6bef4d31 | 1837 | cluster->root = RB_ROOT; |
96303081 | 1838 | |
fa9c0d79 CM |
1839 | out: |
1840 | spin_unlock(&cluster->lock); | |
96303081 | 1841 | btrfs_put_block_group(block_group); |
fa9c0d79 CM |
1842 | return 0; |
1843 | } | |
1844 | ||
09655373 | 1845 | void __btrfs_remove_free_space_cache_locked(struct btrfs_free_space_ctl *ctl) |
0f9dd46c JB |
1846 | { |
1847 | struct btrfs_free_space *info; | |
1848 | struct rb_node *node; | |
581bb050 | 1849 | |
581bb050 LZ |
1850 | while ((node = rb_last(&ctl->free_space_offset)) != NULL) { |
1851 | info = rb_entry(node, struct btrfs_free_space, offset_index); | |
9b90f513 JB |
1852 | if (!info->bitmap) { |
1853 | unlink_free_space(ctl, info); | |
1854 | kmem_cache_free(btrfs_free_space_cachep, info); | |
1855 | } else { | |
1856 | free_bitmap(ctl, info); | |
1857 | } | |
581bb050 LZ |
1858 | if (need_resched()) { |
1859 | spin_unlock(&ctl->tree_lock); | |
1860 | cond_resched(); | |
1861 | spin_lock(&ctl->tree_lock); | |
1862 | } | |
1863 | } | |
09655373 CM |
1864 | } |
1865 | ||
1866 | void __btrfs_remove_free_space_cache(struct btrfs_free_space_ctl *ctl) | |
1867 | { | |
1868 | spin_lock(&ctl->tree_lock); | |
1869 | __btrfs_remove_free_space_cache_locked(ctl); | |
581bb050 LZ |
1870 | spin_unlock(&ctl->tree_lock); |
1871 | } | |
1872 | ||
1873 | void btrfs_remove_free_space_cache(struct btrfs_block_group_cache *block_group) | |
1874 | { | |
1875 | struct btrfs_free_space_ctl *ctl = block_group->free_space_ctl; | |
fa9c0d79 | 1876 | struct btrfs_free_cluster *cluster; |
96303081 | 1877 | struct list_head *head; |
0f9dd46c | 1878 | |
34d52cb6 | 1879 | spin_lock(&ctl->tree_lock); |
96303081 JB |
1880 | while ((head = block_group->cluster_list.next) != |
1881 | &block_group->cluster_list) { | |
1882 | cluster = list_entry(head, struct btrfs_free_cluster, | |
1883 | block_group_list); | |
fa9c0d79 CM |
1884 | |
1885 | WARN_ON(cluster->block_group != block_group); | |
1886 | __btrfs_return_cluster_to_free_space(block_group, cluster); | |
96303081 | 1887 | if (need_resched()) { |
34d52cb6 | 1888 | spin_unlock(&ctl->tree_lock); |
96303081 | 1889 | cond_resched(); |
34d52cb6 | 1890 | spin_lock(&ctl->tree_lock); |
96303081 | 1891 | } |
fa9c0d79 | 1892 | } |
09655373 | 1893 | __btrfs_remove_free_space_cache_locked(ctl); |
34d52cb6 | 1894 | spin_unlock(&ctl->tree_lock); |
fa9c0d79 | 1895 | |
0f9dd46c JB |
1896 | } |
1897 | ||
6226cb0a JB |
1898 | u64 btrfs_find_space_for_alloc(struct btrfs_block_group_cache *block_group, |
1899 | u64 offset, u64 bytes, u64 empty_size) | |
0f9dd46c | 1900 | { |
34d52cb6 | 1901 | struct btrfs_free_space_ctl *ctl = block_group->free_space_ctl; |
6226cb0a | 1902 | struct btrfs_free_space *entry = NULL; |
96303081 | 1903 | u64 bytes_search = bytes + empty_size; |
6226cb0a | 1904 | u64 ret = 0; |
0f9dd46c | 1905 | |
34d52cb6 LZ |
1906 | spin_lock(&ctl->tree_lock); |
1907 | entry = find_free_space(ctl, &offset, &bytes_search); | |
6226cb0a | 1908 | if (!entry) |
96303081 JB |
1909 | goto out; |
1910 | ||
1911 | ret = offset; | |
1912 | if (entry->bitmap) { | |
34d52cb6 | 1913 | bitmap_clear_bits(ctl, entry, offset, bytes); |
edf6e2d1 | 1914 | if (!entry->bytes) |
34d52cb6 | 1915 | free_bitmap(ctl, entry); |
96303081 | 1916 | } else { |
34d52cb6 | 1917 | unlink_free_space(ctl, entry); |
6226cb0a JB |
1918 | entry->offset += bytes; |
1919 | entry->bytes -= bytes; | |
6226cb0a | 1920 | if (!entry->bytes) |
dc89e982 | 1921 | kmem_cache_free(btrfs_free_space_cachep, entry); |
6226cb0a | 1922 | else |
34d52cb6 | 1923 | link_free_space(ctl, entry); |
6226cb0a | 1924 | } |
0f9dd46c | 1925 | |
96303081 | 1926 | out: |
34d52cb6 | 1927 | spin_unlock(&ctl->tree_lock); |
817d52f8 | 1928 | |
0f9dd46c JB |
1929 | return ret; |
1930 | } | |
fa9c0d79 CM |
1931 | |
1932 | /* | |
1933 | * given a cluster, put all of its extents back into the free space | |
1934 | * cache. If a block group is passed, this function will only free | |
1935 | * a cluster that belongs to the passed block group. | |
1936 | * | |
1937 | * Otherwise, it'll get a reference on the block group pointed to by the | |
1938 | * cluster and remove the cluster from it. | |
1939 | */ | |
1940 | int btrfs_return_cluster_to_free_space( | |
1941 | struct btrfs_block_group_cache *block_group, | |
1942 | struct btrfs_free_cluster *cluster) | |
1943 | { | |
34d52cb6 | 1944 | struct btrfs_free_space_ctl *ctl; |
fa9c0d79 CM |
1945 | int ret; |
1946 | ||
1947 | /* first, get a safe pointer to the block group */ | |
1948 | spin_lock(&cluster->lock); | |
1949 | if (!block_group) { | |
1950 | block_group = cluster->block_group; | |
1951 | if (!block_group) { | |
1952 | spin_unlock(&cluster->lock); | |
1953 | return 0; | |
1954 | } | |
1955 | } else if (cluster->block_group != block_group) { | |
1956 | /* someone else has already freed it don't redo their work */ | |
1957 | spin_unlock(&cluster->lock); | |
1958 | return 0; | |
1959 | } | |
1960 | atomic_inc(&block_group->count); | |
1961 | spin_unlock(&cluster->lock); | |
1962 | ||
34d52cb6 LZ |
1963 | ctl = block_group->free_space_ctl; |
1964 | ||
fa9c0d79 | 1965 | /* now return any extents the cluster had on it */ |
34d52cb6 | 1966 | spin_lock(&ctl->tree_lock); |
fa9c0d79 | 1967 | ret = __btrfs_return_cluster_to_free_space(block_group, cluster); |
34d52cb6 | 1968 | spin_unlock(&ctl->tree_lock); |
fa9c0d79 CM |
1969 | |
1970 | /* finally drop our ref */ | |
1971 | btrfs_put_block_group(block_group); | |
1972 | return ret; | |
1973 | } | |
1974 | ||
96303081 JB |
1975 | static u64 btrfs_alloc_from_bitmap(struct btrfs_block_group_cache *block_group, |
1976 | struct btrfs_free_cluster *cluster, | |
4e69b598 | 1977 | struct btrfs_free_space *entry, |
96303081 JB |
1978 | u64 bytes, u64 min_start) |
1979 | { | |
34d52cb6 | 1980 | struct btrfs_free_space_ctl *ctl = block_group->free_space_ctl; |
96303081 JB |
1981 | int err; |
1982 | u64 search_start = cluster->window_start; | |
1983 | u64 search_bytes = bytes; | |
1984 | u64 ret = 0; | |
1985 | ||
96303081 JB |
1986 | search_start = min_start; |
1987 | search_bytes = bytes; | |
1988 | ||
34d52cb6 | 1989 | err = search_bitmap(ctl, entry, &search_start, &search_bytes); |
96303081 | 1990 | if (err) |
4e69b598 | 1991 | return 0; |
96303081 JB |
1992 | |
1993 | ret = search_start; | |
bb3ac5a4 | 1994 | __bitmap_clear_bits(ctl, entry, ret, bytes); |
96303081 JB |
1995 | |
1996 | return ret; | |
1997 | } | |
1998 | ||
fa9c0d79 CM |
1999 | /* |
2000 | * given a cluster, try to allocate 'bytes' from it, returns 0 | |
2001 | * if it couldn't find anything suitably large, or a logical disk offset | |
2002 | * if things worked out | |
2003 | */ | |
2004 | u64 btrfs_alloc_from_cluster(struct btrfs_block_group_cache *block_group, | |
2005 | struct btrfs_free_cluster *cluster, u64 bytes, | |
2006 | u64 min_start) | |
2007 | { | |
34d52cb6 | 2008 | struct btrfs_free_space_ctl *ctl = block_group->free_space_ctl; |
fa9c0d79 CM |
2009 | struct btrfs_free_space *entry = NULL; |
2010 | struct rb_node *node; | |
2011 | u64 ret = 0; | |
2012 | ||
2013 | spin_lock(&cluster->lock); | |
2014 | if (bytes > cluster->max_size) | |
2015 | goto out; | |
2016 | ||
2017 | if (cluster->block_group != block_group) | |
2018 | goto out; | |
2019 | ||
2020 | node = rb_first(&cluster->root); | |
2021 | if (!node) | |
2022 | goto out; | |
2023 | ||
2024 | entry = rb_entry(node, struct btrfs_free_space, offset_index); | |
fa9c0d79 | 2025 | while(1) { |
4e69b598 JB |
2026 | if (entry->bytes < bytes || |
2027 | (!entry->bitmap && entry->offset < min_start)) { | |
fa9c0d79 CM |
2028 | node = rb_next(&entry->offset_index); |
2029 | if (!node) | |
2030 | break; | |
2031 | entry = rb_entry(node, struct btrfs_free_space, | |
2032 | offset_index); | |
2033 | continue; | |
2034 | } | |
fa9c0d79 | 2035 | |
4e69b598 JB |
2036 | if (entry->bitmap) { |
2037 | ret = btrfs_alloc_from_bitmap(block_group, | |
2038 | cluster, entry, bytes, | |
2039 | min_start); | |
2040 | if (ret == 0) { | |
4e69b598 JB |
2041 | node = rb_next(&entry->offset_index); |
2042 | if (!node) | |
2043 | break; | |
2044 | entry = rb_entry(node, struct btrfs_free_space, | |
2045 | offset_index); | |
2046 | continue; | |
2047 | } | |
2048 | } else { | |
4e69b598 JB |
2049 | ret = entry->offset; |
2050 | ||
2051 | entry->offset += bytes; | |
2052 | entry->bytes -= bytes; | |
2053 | } | |
fa9c0d79 | 2054 | |
5e71b5d5 | 2055 | if (entry->bytes == 0) |
fa9c0d79 | 2056 | rb_erase(&entry->offset_index, &cluster->root); |
fa9c0d79 CM |
2057 | break; |
2058 | } | |
2059 | out: | |
2060 | spin_unlock(&cluster->lock); | |
96303081 | 2061 | |
5e71b5d5 LZ |
2062 | if (!ret) |
2063 | return 0; | |
2064 | ||
34d52cb6 | 2065 | spin_lock(&ctl->tree_lock); |
5e71b5d5 | 2066 | |
34d52cb6 | 2067 | ctl->free_space -= bytes; |
5e71b5d5 | 2068 | if (entry->bytes == 0) { |
34d52cb6 | 2069 | ctl->free_extents--; |
4e69b598 JB |
2070 | if (entry->bitmap) { |
2071 | kfree(entry->bitmap); | |
34d52cb6 LZ |
2072 | ctl->total_bitmaps--; |
2073 | ctl->op->recalc_thresholds(ctl); | |
4e69b598 | 2074 | } |
dc89e982 | 2075 | kmem_cache_free(btrfs_free_space_cachep, entry); |
5e71b5d5 LZ |
2076 | } |
2077 | ||
34d52cb6 | 2078 | spin_unlock(&ctl->tree_lock); |
5e71b5d5 | 2079 | |
fa9c0d79 CM |
2080 | return ret; |
2081 | } | |
2082 | ||
96303081 JB |
2083 | static int btrfs_bitmap_cluster(struct btrfs_block_group_cache *block_group, |
2084 | struct btrfs_free_space *entry, | |
2085 | struct btrfs_free_cluster *cluster, | |
2086 | u64 offset, u64 bytes, u64 min_bytes) | |
2087 | { | |
34d52cb6 | 2088 | struct btrfs_free_space_ctl *ctl = block_group->free_space_ctl; |
96303081 JB |
2089 | unsigned long next_zero; |
2090 | unsigned long i; | |
2091 | unsigned long search_bits; | |
2092 | unsigned long total_bits; | |
2093 | unsigned long found_bits; | |
2094 | unsigned long start = 0; | |
2095 | unsigned long total_found = 0; | |
4e69b598 | 2096 | int ret; |
96303081 JB |
2097 | bool found = false; |
2098 | ||
2099 | i = offset_to_bit(entry->offset, block_group->sectorsize, | |
2100 | max_t(u64, offset, entry->offset)); | |
d0a365e8 JB |
2101 | search_bits = bytes_to_bits(bytes, block_group->sectorsize); |
2102 | total_bits = bytes_to_bits(min_bytes, block_group->sectorsize); | |
96303081 JB |
2103 | |
2104 | again: | |
2105 | found_bits = 0; | |
2106 | for (i = find_next_bit(entry->bitmap, BITS_PER_BITMAP, i); | |
2107 | i < BITS_PER_BITMAP; | |
2108 | i = find_next_bit(entry->bitmap, BITS_PER_BITMAP, i + 1)) { | |
2109 | next_zero = find_next_zero_bit(entry->bitmap, | |
2110 | BITS_PER_BITMAP, i); | |
2111 | if (next_zero - i >= search_bits) { | |
2112 | found_bits = next_zero - i; | |
2113 | break; | |
2114 | } | |
2115 | i = next_zero; | |
2116 | } | |
2117 | ||
2118 | if (!found_bits) | |
4e69b598 | 2119 | return -ENOSPC; |
96303081 JB |
2120 | |
2121 | if (!found) { | |
2122 | start = i; | |
2123 | found = true; | |
2124 | } | |
2125 | ||
2126 | total_found += found_bits; | |
2127 | ||
2128 | if (cluster->max_size < found_bits * block_group->sectorsize) | |
2129 | cluster->max_size = found_bits * block_group->sectorsize; | |
2130 | ||
2131 | if (total_found < total_bits) { | |
2132 | i = find_next_bit(entry->bitmap, BITS_PER_BITMAP, next_zero); | |
2133 | if (i - start > total_bits * 2) { | |
2134 | total_found = 0; | |
2135 | cluster->max_size = 0; | |
2136 | found = false; | |
2137 | } | |
2138 | goto again; | |
2139 | } | |
2140 | ||
2141 | cluster->window_start = start * block_group->sectorsize + | |
2142 | entry->offset; | |
34d52cb6 | 2143 | rb_erase(&entry->offset_index, &ctl->free_space_offset); |
4e69b598 JB |
2144 | ret = tree_insert_offset(&cluster->root, entry->offset, |
2145 | &entry->offset_index, 1); | |
2146 | BUG_ON(ret); | |
96303081 JB |
2147 | |
2148 | return 0; | |
2149 | } | |
2150 | ||
4e69b598 JB |
2151 | /* |
2152 | * This searches the block group for just extents to fill the cluster with. | |
2153 | */ | |
3de85bb9 JB |
2154 | static noinline int |
2155 | setup_cluster_no_bitmap(struct btrfs_block_group_cache *block_group, | |
2156 | struct btrfs_free_cluster *cluster, | |
2157 | struct list_head *bitmaps, u64 offset, u64 bytes, | |
2158 | u64 min_bytes) | |
4e69b598 | 2159 | { |
34d52cb6 | 2160 | struct btrfs_free_space_ctl *ctl = block_group->free_space_ctl; |
4e69b598 JB |
2161 | struct btrfs_free_space *first = NULL; |
2162 | struct btrfs_free_space *entry = NULL; | |
2163 | struct btrfs_free_space *prev = NULL; | |
2164 | struct btrfs_free_space *last; | |
2165 | struct rb_node *node; | |
2166 | u64 window_start; | |
2167 | u64 window_free; | |
2168 | u64 max_extent; | |
2169 | u64 max_gap = 128 * 1024; | |
2170 | ||
34d52cb6 | 2171 | entry = tree_search_offset(ctl, offset, 0, 1); |
4e69b598 JB |
2172 | if (!entry) |
2173 | return -ENOSPC; | |
2174 | ||
2175 | /* | |
2176 | * We don't want bitmaps, so just move along until we find a normal | |
2177 | * extent entry. | |
2178 | */ | |
2179 | while (entry->bitmap) { | |
86d4a77b JB |
2180 | if (list_empty(&entry->list)) |
2181 | list_add_tail(&entry->list, bitmaps); | |
4e69b598 JB |
2182 | node = rb_next(&entry->offset_index); |
2183 | if (!node) | |
2184 | return -ENOSPC; | |
2185 | entry = rb_entry(node, struct btrfs_free_space, offset_index); | |
2186 | } | |
2187 | ||
2188 | window_start = entry->offset; | |
2189 | window_free = entry->bytes; | |
2190 | max_extent = entry->bytes; | |
2191 | first = entry; | |
2192 | last = entry; | |
2193 | prev = entry; | |
2194 | ||
2195 | while (window_free <= min_bytes) { | |
2196 | node = rb_next(&entry->offset_index); | |
2197 | if (!node) | |
2198 | return -ENOSPC; | |
2199 | entry = rb_entry(node, struct btrfs_free_space, offset_index); | |
2200 | ||
86d4a77b JB |
2201 | if (entry->bitmap) { |
2202 | if (list_empty(&entry->list)) | |
2203 | list_add_tail(&entry->list, bitmaps); | |
4e69b598 | 2204 | continue; |
86d4a77b JB |
2205 | } |
2206 | ||
4e69b598 JB |
2207 | /* |
2208 | * we haven't filled the empty size and the window is | |
2209 | * very large. reset and try again | |
2210 | */ | |
2211 | if (entry->offset - (prev->offset + prev->bytes) > max_gap || | |
2212 | entry->offset - window_start > (min_bytes * 2)) { | |
2213 | first = entry; | |
2214 | window_start = entry->offset; | |
2215 | window_free = entry->bytes; | |
2216 | last = entry; | |
2217 | max_extent = entry->bytes; | |
2218 | } else { | |
2219 | last = entry; | |
2220 | window_free += entry->bytes; | |
2221 | if (entry->bytes > max_extent) | |
2222 | max_extent = entry->bytes; | |
2223 | } | |
2224 | prev = entry; | |
2225 | } | |
2226 | ||
2227 | cluster->window_start = first->offset; | |
2228 | ||
2229 | node = &first->offset_index; | |
2230 | ||
2231 | /* | |
2232 | * now we've found our entries, pull them out of the free space | |
2233 | * cache and put them into the cluster rbtree | |
2234 | */ | |
2235 | do { | |
2236 | int ret; | |
2237 | ||
2238 | entry = rb_entry(node, struct btrfs_free_space, offset_index); | |
2239 | node = rb_next(&entry->offset_index); | |
2240 | if (entry->bitmap) | |
2241 | continue; | |
2242 | ||
34d52cb6 | 2243 | rb_erase(&entry->offset_index, &ctl->free_space_offset); |
4e69b598 JB |
2244 | ret = tree_insert_offset(&cluster->root, entry->offset, |
2245 | &entry->offset_index, 0); | |
2246 | BUG_ON(ret); | |
2247 | } while (node && entry != last); | |
2248 | ||
2249 | cluster->max_size = max_extent; | |
2250 | ||
2251 | return 0; | |
2252 | } | |
2253 | ||
2254 | /* | |
2255 | * This specifically looks for bitmaps that may work in the cluster, we assume | |
2256 | * that we have already failed to find extents that will work. | |
2257 | */ | |
3de85bb9 JB |
2258 | static noinline int |
2259 | setup_cluster_bitmap(struct btrfs_block_group_cache *block_group, | |
2260 | struct btrfs_free_cluster *cluster, | |
2261 | struct list_head *bitmaps, u64 offset, u64 bytes, | |
2262 | u64 min_bytes) | |
4e69b598 | 2263 | { |
34d52cb6 | 2264 | struct btrfs_free_space_ctl *ctl = block_group->free_space_ctl; |
4e69b598 JB |
2265 | struct btrfs_free_space *entry; |
2266 | struct rb_node *node; | |
2267 | int ret = -ENOSPC; | |
2268 | ||
34d52cb6 | 2269 | if (ctl->total_bitmaps == 0) |
4e69b598 JB |
2270 | return -ENOSPC; |
2271 | ||
86d4a77b JB |
2272 | /* |
2273 | * First check our cached list of bitmaps and see if there is an entry | |
2274 | * here that will work. | |
2275 | */ | |
2276 | list_for_each_entry(entry, bitmaps, list) { | |
2277 | if (entry->bytes < min_bytes) | |
2278 | continue; | |
2279 | ret = btrfs_bitmap_cluster(block_group, entry, cluster, offset, | |
2280 | bytes, min_bytes); | |
2281 | if (!ret) | |
2282 | return 0; | |
2283 | } | |
2284 | ||
2285 | /* | |
2286 | * If we do have entries on our list and we are here then we didn't find | |
2287 | * anything, so go ahead and get the next entry after the last entry in | |
2288 | * this list and start the search from there. | |
2289 | */ | |
2290 | if (!list_empty(bitmaps)) { | |
2291 | entry = list_entry(bitmaps->prev, struct btrfs_free_space, | |
2292 | list); | |
2293 | node = rb_next(&entry->offset_index); | |
2294 | if (!node) | |
2295 | return -ENOSPC; | |
2296 | entry = rb_entry(node, struct btrfs_free_space, offset_index); | |
2297 | goto search; | |
2298 | } | |
2299 | ||
34d52cb6 | 2300 | entry = tree_search_offset(ctl, offset_to_bitmap(ctl, offset), 0, 1); |
4e69b598 JB |
2301 | if (!entry) |
2302 | return -ENOSPC; | |
2303 | ||
86d4a77b | 2304 | search: |
4e69b598 JB |
2305 | node = &entry->offset_index; |
2306 | do { | |
2307 | entry = rb_entry(node, struct btrfs_free_space, offset_index); | |
2308 | node = rb_next(&entry->offset_index); | |
2309 | if (!entry->bitmap) | |
2310 | continue; | |
2311 | if (entry->bytes < min_bytes) | |
2312 | continue; | |
2313 | ret = btrfs_bitmap_cluster(block_group, entry, cluster, offset, | |
2314 | bytes, min_bytes); | |
2315 | } while (ret && node); | |
2316 | ||
2317 | return ret; | |
2318 | } | |
2319 | ||
fa9c0d79 CM |
2320 | /* |
2321 | * here we try to find a cluster of blocks in a block group. The goal | |
2322 | * is to find at least bytes free and up to empty_size + bytes free. | |
2323 | * We might not find them all in one contiguous area. | |
2324 | * | |
2325 | * returns zero and sets up cluster if things worked out, otherwise | |
2326 | * it returns -enospc | |
2327 | */ | |
2328 | int btrfs_find_space_cluster(struct btrfs_trans_handle *trans, | |
451d7585 | 2329 | struct btrfs_root *root, |
fa9c0d79 CM |
2330 | struct btrfs_block_group_cache *block_group, |
2331 | struct btrfs_free_cluster *cluster, | |
2332 | u64 offset, u64 bytes, u64 empty_size) | |
2333 | { | |
34d52cb6 | 2334 | struct btrfs_free_space_ctl *ctl = block_group->free_space_ctl; |
86d4a77b JB |
2335 | struct list_head bitmaps; |
2336 | struct btrfs_free_space *entry, *tmp; | |
fa9c0d79 | 2337 | u64 min_bytes; |
fa9c0d79 CM |
2338 | int ret; |
2339 | ||
2340 | /* for metadata, allow allocates with more holes */ | |
451d7585 CM |
2341 | if (btrfs_test_opt(root, SSD_SPREAD)) { |
2342 | min_bytes = bytes + empty_size; | |
2343 | } else if (block_group->flags & BTRFS_BLOCK_GROUP_METADATA) { | |
fa9c0d79 CM |
2344 | /* |
2345 | * we want to do larger allocations when we are | |
2346 | * flushing out the delayed refs, it helps prevent | |
2347 | * making more work as we go along. | |
2348 | */ | |
2349 | if (trans->transaction->delayed_refs.flushing) | |
2350 | min_bytes = max(bytes, (bytes + empty_size) >> 1); | |
2351 | else | |
2352 | min_bytes = max(bytes, (bytes + empty_size) >> 4); | |
2353 | } else | |
2354 | min_bytes = max(bytes, (bytes + empty_size) >> 2); | |
2355 | ||
34d52cb6 | 2356 | spin_lock(&ctl->tree_lock); |
7d0d2e8e JB |
2357 | |
2358 | /* | |
2359 | * If we know we don't have enough space to make a cluster don't even | |
2360 | * bother doing all the work to try and find one. | |
2361 | */ | |
34d52cb6 LZ |
2362 | if (ctl->free_space < min_bytes) { |
2363 | spin_unlock(&ctl->tree_lock); | |
7d0d2e8e JB |
2364 | return -ENOSPC; |
2365 | } | |
2366 | ||
fa9c0d79 CM |
2367 | spin_lock(&cluster->lock); |
2368 | ||
2369 | /* someone already found a cluster, hooray */ | |
2370 | if (cluster->block_group) { | |
2371 | ret = 0; | |
2372 | goto out; | |
2373 | } | |
fa9c0d79 | 2374 | |
86d4a77b JB |
2375 | INIT_LIST_HEAD(&bitmaps); |
2376 | ret = setup_cluster_no_bitmap(block_group, cluster, &bitmaps, offset, | |
2377 | bytes, min_bytes); | |
4e69b598 | 2378 | if (ret) |
86d4a77b JB |
2379 | ret = setup_cluster_bitmap(block_group, cluster, &bitmaps, |
2380 | offset, bytes, min_bytes); | |
2381 | ||
2382 | /* Clear our temporary list */ | |
2383 | list_for_each_entry_safe(entry, tmp, &bitmaps, list) | |
2384 | list_del_init(&entry->list); | |
fa9c0d79 | 2385 | |
4e69b598 JB |
2386 | if (!ret) { |
2387 | atomic_inc(&block_group->count); | |
2388 | list_add_tail(&cluster->block_group_list, | |
2389 | &block_group->cluster_list); | |
2390 | cluster->block_group = block_group; | |
fa9c0d79 | 2391 | } |
fa9c0d79 CM |
2392 | out: |
2393 | spin_unlock(&cluster->lock); | |
34d52cb6 | 2394 | spin_unlock(&ctl->tree_lock); |
fa9c0d79 CM |
2395 | |
2396 | return ret; | |
2397 | } | |
2398 | ||
2399 | /* | |
2400 | * simple code to zero out a cluster | |
2401 | */ | |
2402 | void btrfs_init_free_cluster(struct btrfs_free_cluster *cluster) | |
2403 | { | |
2404 | spin_lock_init(&cluster->lock); | |
2405 | spin_lock_init(&cluster->refill_lock); | |
6bef4d31 | 2406 | cluster->root = RB_ROOT; |
fa9c0d79 CM |
2407 | cluster->max_size = 0; |
2408 | INIT_LIST_HEAD(&cluster->block_group_list); | |
2409 | cluster->block_group = NULL; | |
2410 | } | |
2411 | ||
f7039b1d LD |
2412 | int btrfs_trim_block_group(struct btrfs_block_group_cache *block_group, |
2413 | u64 *trimmed, u64 start, u64 end, u64 minlen) | |
2414 | { | |
34d52cb6 | 2415 | struct btrfs_free_space_ctl *ctl = block_group->free_space_ctl; |
f7039b1d LD |
2416 | struct btrfs_free_space *entry = NULL; |
2417 | struct btrfs_fs_info *fs_info = block_group->fs_info; | |
2418 | u64 bytes = 0; | |
2419 | u64 actually_trimmed; | |
2420 | int ret = 0; | |
2421 | ||
2422 | *trimmed = 0; | |
2423 | ||
2424 | while (start < end) { | |
34d52cb6 | 2425 | spin_lock(&ctl->tree_lock); |
f7039b1d | 2426 | |
34d52cb6 LZ |
2427 | if (ctl->free_space < minlen) { |
2428 | spin_unlock(&ctl->tree_lock); | |
f7039b1d LD |
2429 | break; |
2430 | } | |
2431 | ||
34d52cb6 | 2432 | entry = tree_search_offset(ctl, start, 0, 1); |
f7039b1d | 2433 | if (!entry) |
34d52cb6 LZ |
2434 | entry = tree_search_offset(ctl, |
2435 | offset_to_bitmap(ctl, start), | |
f7039b1d LD |
2436 | 1, 1); |
2437 | ||
2438 | if (!entry || entry->offset >= end) { | |
34d52cb6 | 2439 | spin_unlock(&ctl->tree_lock); |
f7039b1d LD |
2440 | break; |
2441 | } | |
2442 | ||
2443 | if (entry->bitmap) { | |
34d52cb6 | 2444 | ret = search_bitmap(ctl, entry, &start, &bytes); |
f7039b1d LD |
2445 | if (!ret) { |
2446 | if (start >= end) { | |
34d52cb6 | 2447 | spin_unlock(&ctl->tree_lock); |
f7039b1d LD |
2448 | break; |
2449 | } | |
2450 | bytes = min(bytes, end - start); | |
34d52cb6 | 2451 | bitmap_clear_bits(ctl, entry, start, bytes); |
f7039b1d | 2452 | if (entry->bytes == 0) |
34d52cb6 | 2453 | free_bitmap(ctl, entry); |
f7039b1d LD |
2454 | } else { |
2455 | start = entry->offset + BITS_PER_BITMAP * | |
2456 | block_group->sectorsize; | |
34d52cb6 | 2457 | spin_unlock(&ctl->tree_lock); |
f7039b1d LD |
2458 | ret = 0; |
2459 | continue; | |
2460 | } | |
2461 | } else { | |
2462 | start = entry->offset; | |
2463 | bytes = min(entry->bytes, end - start); | |
34d52cb6 | 2464 | unlink_free_space(ctl, entry); |
f789b684 | 2465 | kmem_cache_free(btrfs_free_space_cachep, entry); |
f7039b1d LD |
2466 | } |
2467 | ||
34d52cb6 | 2468 | spin_unlock(&ctl->tree_lock); |
f7039b1d LD |
2469 | |
2470 | if (bytes >= minlen) { | |
2471 | int update_ret; | |
2472 | update_ret = btrfs_update_reserved_bytes(block_group, | |
2473 | bytes, 1, 1); | |
2474 | ||
2475 | ret = btrfs_error_discard_extent(fs_info->extent_root, | |
2476 | start, | |
2477 | bytes, | |
2478 | &actually_trimmed); | |
2479 | ||
34d52cb6 | 2480 | btrfs_add_free_space(block_group, start, bytes); |
f7039b1d LD |
2481 | if (!update_ret) |
2482 | btrfs_update_reserved_bytes(block_group, | |
2483 | bytes, 0, 1); | |
2484 | ||
2485 | if (ret) | |
2486 | break; | |
2487 | *trimmed += actually_trimmed; | |
2488 | } | |
2489 | start += bytes; | |
2490 | bytes = 0; | |
2491 | ||
2492 | if (fatal_signal_pending(current)) { | |
2493 | ret = -ERESTARTSYS; | |
2494 | break; | |
2495 | } | |
2496 | ||
2497 | cond_resched(); | |
2498 | } | |
2499 | ||
2500 | return ret; | |
2501 | } | |
581bb050 LZ |
2502 | |
2503 | /* | |
2504 | * Find the left-most item in the cache tree, and then return the | |
2505 | * smallest inode number in the item. | |
2506 | * | |
2507 | * Note: the returned inode number may not be the smallest one in | |
2508 | * the tree, if the left-most item is a bitmap. | |
2509 | */ | |
2510 | u64 btrfs_find_ino_for_alloc(struct btrfs_root *fs_root) | |
2511 | { | |
2512 | struct btrfs_free_space_ctl *ctl = fs_root->free_ino_ctl; | |
2513 | struct btrfs_free_space *entry = NULL; | |
2514 | u64 ino = 0; | |
2515 | ||
2516 | spin_lock(&ctl->tree_lock); | |
2517 | ||
2518 | if (RB_EMPTY_ROOT(&ctl->free_space_offset)) | |
2519 | goto out; | |
2520 | ||
2521 | entry = rb_entry(rb_first(&ctl->free_space_offset), | |
2522 | struct btrfs_free_space, offset_index); | |
2523 | ||
2524 | if (!entry->bitmap) { | |
2525 | ino = entry->offset; | |
2526 | ||
2527 | unlink_free_space(ctl, entry); | |
2528 | entry->offset++; | |
2529 | entry->bytes--; | |
2530 | if (!entry->bytes) | |
2531 | kmem_cache_free(btrfs_free_space_cachep, entry); | |
2532 | else | |
2533 | link_free_space(ctl, entry); | |
2534 | } else { | |
2535 | u64 offset = 0; | |
2536 | u64 count = 1; | |
2537 | int ret; | |
2538 | ||
2539 | ret = search_bitmap(ctl, entry, &offset, &count); | |
2540 | BUG_ON(ret); | |
2541 | ||
2542 | ino = offset; | |
2543 | bitmap_clear_bits(ctl, entry, offset, 1); | |
2544 | if (entry->bytes == 0) | |
2545 | free_bitmap(ctl, entry); | |
2546 | } | |
2547 | out: | |
2548 | spin_unlock(&ctl->tree_lock); | |
2549 | ||
2550 | return ino; | |
2551 | } | |
82d5902d LZ |
2552 | |
2553 | struct inode *lookup_free_ino_inode(struct btrfs_root *root, | |
2554 | struct btrfs_path *path) | |
2555 | { | |
2556 | struct inode *inode = NULL; | |
2557 | ||
2558 | spin_lock(&root->cache_lock); | |
2559 | if (root->cache_inode) | |
2560 | inode = igrab(root->cache_inode); | |
2561 | spin_unlock(&root->cache_lock); | |
2562 | if (inode) | |
2563 | return inode; | |
2564 | ||
2565 | inode = __lookup_free_space_inode(root, path, 0); | |
2566 | if (IS_ERR(inode)) | |
2567 | return inode; | |
2568 | ||
2569 | spin_lock(&root->cache_lock); | |
7841cb28 | 2570 | if (!btrfs_fs_closing(root->fs_info)) |
82d5902d LZ |
2571 | root->cache_inode = igrab(inode); |
2572 | spin_unlock(&root->cache_lock); | |
2573 | ||
2574 | return inode; | |
2575 | } | |
2576 | ||
2577 | int create_free_ino_inode(struct btrfs_root *root, | |
2578 | struct btrfs_trans_handle *trans, | |
2579 | struct btrfs_path *path) | |
2580 | { | |
2581 | return __create_free_space_inode(root, trans, path, | |
2582 | BTRFS_FREE_INO_OBJECTID, 0); | |
2583 | } | |
2584 | ||
2585 | int load_free_ino_cache(struct btrfs_fs_info *fs_info, struct btrfs_root *root) | |
2586 | { | |
2587 | struct btrfs_free_space_ctl *ctl = root->free_ino_ctl; | |
2588 | struct btrfs_path *path; | |
2589 | struct inode *inode; | |
2590 | int ret = 0; | |
2591 | u64 root_gen = btrfs_root_generation(&root->root_item); | |
2592 | ||
4b9465cb CM |
2593 | if (!btrfs_test_opt(root, INODE_MAP_CACHE)) |
2594 | return 0; | |
2595 | ||
82d5902d LZ |
2596 | /* |
2597 | * If we're unmounting then just return, since this does a search on the | |
2598 | * normal root and not the commit root and we could deadlock. | |
2599 | */ | |
7841cb28 | 2600 | if (btrfs_fs_closing(fs_info)) |
82d5902d LZ |
2601 | return 0; |
2602 | ||
2603 | path = btrfs_alloc_path(); | |
2604 | if (!path) | |
2605 | return 0; | |
2606 | ||
2607 | inode = lookup_free_ino_inode(root, path); | |
2608 | if (IS_ERR(inode)) | |
2609 | goto out; | |
2610 | ||
2611 | if (root_gen != BTRFS_I(inode)->generation) | |
2612 | goto out_put; | |
2613 | ||
2614 | ret = __load_free_space_cache(root, inode, ctl, path, 0); | |
2615 | ||
2616 | if (ret < 0) | |
2617 | printk(KERN_ERR "btrfs: failed to load free ino cache for " | |
2618 | "root %llu\n", root->root_key.objectid); | |
2619 | out_put: | |
2620 | iput(inode); | |
2621 | out: | |
2622 | btrfs_free_path(path); | |
2623 | return ret; | |
2624 | } | |
2625 | ||
2626 | int btrfs_write_out_ino_cache(struct btrfs_root *root, | |
2627 | struct btrfs_trans_handle *trans, | |
2628 | struct btrfs_path *path) | |
2629 | { | |
2630 | struct btrfs_free_space_ctl *ctl = root->free_ino_ctl; | |
2631 | struct inode *inode; | |
2632 | int ret; | |
2633 | ||
4b9465cb CM |
2634 | if (!btrfs_test_opt(root, INODE_MAP_CACHE)) |
2635 | return 0; | |
2636 | ||
82d5902d LZ |
2637 | inode = lookup_free_ino_inode(root, path); |
2638 | if (IS_ERR(inode)) | |
2639 | return 0; | |
2640 | ||
2641 | ret = __btrfs_write_out_cache(root, inode, ctl, NULL, trans, path, 0); | |
2642 | if (ret < 0) | |
2643 | printk(KERN_ERR "btrfs: failed to write free ino cache " | |
2644 | "for root %llu\n", root->root_key.objectid); | |
2645 | ||
2646 | iput(inode); | |
2647 | return ret; | |
2648 | } |