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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> |
6ab60601 | 23 | #include <linux/ratelimit.h> |
0f9dd46c | 24 | #include "ctree.h" |
fa9c0d79 CM |
25 | #include "free-space-cache.h" |
26 | #include "transaction.h" | |
0af3d00b | 27 | #include "disk-io.h" |
43be2146 | 28 | #include "extent_io.h" |
581bb050 | 29 | #include "inode-map.h" |
fa9c0d79 | 30 | |
96303081 JB |
31 | #define BITS_PER_BITMAP (PAGE_CACHE_SIZE * 8) |
32 | #define MAX_CACHE_BYTES_PER_GIG (32 * 1024) | |
0f9dd46c | 33 | |
34d52cb6 | 34 | static int link_free_space(struct btrfs_free_space_ctl *ctl, |
0cb59c99 JB |
35 | struct btrfs_free_space *info); |
36 | ||
0414efae LZ |
37 | static struct inode *__lookup_free_space_inode(struct btrfs_root *root, |
38 | struct btrfs_path *path, | |
39 | u64 offset) | |
0af3d00b JB |
40 | { |
41 | struct btrfs_key key; | |
42 | struct btrfs_key location; | |
43 | struct btrfs_disk_key disk_key; | |
44 | struct btrfs_free_space_header *header; | |
45 | struct extent_buffer *leaf; | |
46 | struct inode *inode = NULL; | |
47 | int ret; | |
48 | ||
0af3d00b | 49 | key.objectid = BTRFS_FREE_SPACE_OBJECTID; |
0414efae | 50 | key.offset = offset; |
0af3d00b JB |
51 | key.type = 0; |
52 | ||
53 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); | |
54 | if (ret < 0) | |
55 | return ERR_PTR(ret); | |
56 | if (ret > 0) { | |
b3b4aa74 | 57 | btrfs_release_path(path); |
0af3d00b JB |
58 | return ERR_PTR(-ENOENT); |
59 | } | |
60 | ||
61 | leaf = path->nodes[0]; | |
62 | header = btrfs_item_ptr(leaf, path->slots[0], | |
63 | struct btrfs_free_space_header); | |
64 | btrfs_free_space_key(leaf, header, &disk_key); | |
65 | btrfs_disk_key_to_cpu(&location, &disk_key); | |
b3b4aa74 | 66 | btrfs_release_path(path); |
0af3d00b JB |
67 | |
68 | inode = btrfs_iget(root->fs_info->sb, &location, root, NULL); | |
69 | if (!inode) | |
70 | return ERR_PTR(-ENOENT); | |
71 | if (IS_ERR(inode)) | |
72 | return inode; | |
73 | if (is_bad_inode(inode)) { | |
74 | iput(inode); | |
75 | return ERR_PTR(-ENOENT); | |
76 | } | |
77 | ||
adae52b9 MX |
78 | inode->i_mapping->flags &= ~__GFP_FS; |
79 | ||
0414efae LZ |
80 | return inode; |
81 | } | |
82 | ||
83 | struct inode *lookup_free_space_inode(struct btrfs_root *root, | |
84 | struct btrfs_block_group_cache | |
85 | *block_group, struct btrfs_path *path) | |
86 | { | |
87 | struct inode *inode = NULL; | |
5b0e95bf | 88 | u32 flags = BTRFS_INODE_NODATASUM | BTRFS_INODE_NODATACOW; |
0414efae LZ |
89 | |
90 | spin_lock(&block_group->lock); | |
91 | if (block_group->inode) | |
92 | inode = igrab(block_group->inode); | |
93 | spin_unlock(&block_group->lock); | |
94 | if (inode) | |
95 | return inode; | |
96 | ||
97 | inode = __lookup_free_space_inode(root, path, | |
98 | block_group->key.objectid); | |
99 | if (IS_ERR(inode)) | |
100 | return inode; | |
101 | ||
0af3d00b | 102 | spin_lock(&block_group->lock); |
5b0e95bf | 103 | if (!((BTRFS_I(inode)->flags & flags) == flags)) { |
2f356126 | 104 | printk(KERN_INFO "Old style space inode found, converting.\n"); |
5b0e95bf JB |
105 | BTRFS_I(inode)->flags |= BTRFS_INODE_NODATASUM | |
106 | BTRFS_INODE_NODATACOW; | |
2f356126 JB |
107 | block_group->disk_cache_state = BTRFS_DC_CLEAR; |
108 | } | |
109 | ||
300e4f8a | 110 | if (!block_group->iref) { |
0af3d00b JB |
111 | block_group->inode = igrab(inode); |
112 | block_group->iref = 1; | |
113 | } | |
114 | spin_unlock(&block_group->lock); | |
115 | ||
116 | return inode; | |
117 | } | |
118 | ||
0414efae LZ |
119 | int __create_free_space_inode(struct btrfs_root *root, |
120 | struct btrfs_trans_handle *trans, | |
121 | struct btrfs_path *path, u64 ino, u64 offset) | |
0af3d00b JB |
122 | { |
123 | struct btrfs_key key; | |
124 | struct btrfs_disk_key disk_key; | |
125 | struct btrfs_free_space_header *header; | |
126 | struct btrfs_inode_item *inode_item; | |
127 | struct extent_buffer *leaf; | |
5b0e95bf | 128 | u64 flags = BTRFS_INODE_NOCOMPRESS | BTRFS_INODE_PREALLOC; |
0af3d00b JB |
129 | int ret; |
130 | ||
0414efae | 131 | ret = btrfs_insert_empty_inode(trans, root, path, ino); |
0af3d00b JB |
132 | if (ret) |
133 | return ret; | |
134 | ||
5b0e95bf JB |
135 | /* We inline crc's for the free disk space cache */ |
136 | if (ino != BTRFS_FREE_INO_OBJECTID) | |
137 | flags |= BTRFS_INODE_NODATASUM | BTRFS_INODE_NODATACOW; | |
138 | ||
0af3d00b JB |
139 | leaf = path->nodes[0]; |
140 | inode_item = btrfs_item_ptr(leaf, path->slots[0], | |
141 | struct btrfs_inode_item); | |
142 | btrfs_item_key(leaf, &disk_key, path->slots[0]); | |
143 | memset_extent_buffer(leaf, 0, (unsigned long)inode_item, | |
144 | sizeof(*inode_item)); | |
145 | btrfs_set_inode_generation(leaf, inode_item, trans->transid); | |
146 | btrfs_set_inode_size(leaf, inode_item, 0); | |
147 | btrfs_set_inode_nbytes(leaf, inode_item, 0); | |
148 | btrfs_set_inode_uid(leaf, inode_item, 0); | |
149 | btrfs_set_inode_gid(leaf, inode_item, 0); | |
150 | btrfs_set_inode_mode(leaf, inode_item, S_IFREG | 0600); | |
5b0e95bf | 151 | btrfs_set_inode_flags(leaf, inode_item, flags); |
0af3d00b JB |
152 | btrfs_set_inode_nlink(leaf, inode_item, 1); |
153 | btrfs_set_inode_transid(leaf, inode_item, trans->transid); | |
0414efae | 154 | btrfs_set_inode_block_group(leaf, inode_item, offset); |
0af3d00b | 155 | btrfs_mark_buffer_dirty(leaf); |
b3b4aa74 | 156 | btrfs_release_path(path); |
0af3d00b JB |
157 | |
158 | key.objectid = BTRFS_FREE_SPACE_OBJECTID; | |
0414efae | 159 | key.offset = offset; |
0af3d00b JB |
160 | key.type = 0; |
161 | ||
162 | ret = btrfs_insert_empty_item(trans, root, path, &key, | |
163 | sizeof(struct btrfs_free_space_header)); | |
164 | if (ret < 0) { | |
b3b4aa74 | 165 | btrfs_release_path(path); |
0af3d00b JB |
166 | return ret; |
167 | } | |
168 | leaf = path->nodes[0]; | |
169 | header = btrfs_item_ptr(leaf, path->slots[0], | |
170 | struct btrfs_free_space_header); | |
171 | memset_extent_buffer(leaf, 0, (unsigned long)header, sizeof(*header)); | |
172 | btrfs_set_free_space_key(leaf, header, &disk_key); | |
173 | btrfs_mark_buffer_dirty(leaf); | |
b3b4aa74 | 174 | btrfs_release_path(path); |
0af3d00b JB |
175 | |
176 | return 0; | |
177 | } | |
178 | ||
0414efae LZ |
179 | int create_free_space_inode(struct btrfs_root *root, |
180 | struct btrfs_trans_handle *trans, | |
181 | struct btrfs_block_group_cache *block_group, | |
182 | struct btrfs_path *path) | |
183 | { | |
184 | int ret; | |
185 | u64 ino; | |
186 | ||
187 | ret = btrfs_find_free_objectid(root, &ino); | |
188 | if (ret < 0) | |
189 | return ret; | |
190 | ||
191 | return __create_free_space_inode(root, trans, path, ino, | |
192 | block_group->key.objectid); | |
193 | } | |
194 | ||
0af3d00b JB |
195 | int btrfs_truncate_free_space_cache(struct btrfs_root *root, |
196 | struct btrfs_trans_handle *trans, | |
197 | struct btrfs_path *path, | |
198 | struct inode *inode) | |
199 | { | |
65450aa6 | 200 | struct btrfs_block_rsv *rsv; |
c8174313 | 201 | u64 needed_bytes; |
0af3d00b JB |
202 | loff_t oldsize; |
203 | int ret = 0; | |
204 | ||
65450aa6 | 205 | rsv = trans->block_rsv; |
c8174313 JB |
206 | trans->block_rsv = &root->fs_info->global_block_rsv; |
207 | ||
208 | /* 1 for slack space, 1 for updating the inode */ | |
209 | needed_bytes = btrfs_calc_trunc_metadata_size(root, 1) + | |
210 | btrfs_calc_trans_metadata_size(root, 1); | |
211 | ||
212 | spin_lock(&trans->block_rsv->lock); | |
213 | if (trans->block_rsv->reserved < needed_bytes) { | |
214 | spin_unlock(&trans->block_rsv->lock); | |
215 | trans->block_rsv = rsv; | |
216 | return -ENOSPC; | |
217 | } | |
218 | spin_unlock(&trans->block_rsv->lock); | |
0af3d00b JB |
219 | |
220 | oldsize = i_size_read(inode); | |
221 | btrfs_i_size_write(inode, 0); | |
222 | truncate_pagecache(inode, oldsize, 0); | |
223 | ||
224 | /* | |
225 | * We don't need an orphan item because truncating the free space cache | |
226 | * will never be split across transactions. | |
227 | */ | |
228 | ret = btrfs_truncate_inode_items(trans, root, inode, | |
229 | 0, BTRFS_EXTENT_DATA_KEY); | |
65450aa6 | 230 | |
0af3d00b | 231 | if (ret) { |
c8174313 | 232 | trans->block_rsv = rsv; |
0af3d00b JB |
233 | WARN_ON(1); |
234 | return ret; | |
235 | } | |
236 | ||
82d5902d | 237 | ret = btrfs_update_inode(trans, root, inode); |
c8174313 JB |
238 | trans->block_rsv = rsv; |
239 | ||
82d5902d | 240 | return ret; |
0af3d00b JB |
241 | } |
242 | ||
9d66e233 JB |
243 | static int readahead_cache(struct inode *inode) |
244 | { | |
245 | struct file_ra_state *ra; | |
246 | unsigned long last_index; | |
247 | ||
248 | ra = kzalloc(sizeof(*ra), GFP_NOFS); | |
249 | if (!ra) | |
250 | return -ENOMEM; | |
251 | ||
252 | file_ra_state_init(ra, inode->i_mapping); | |
253 | last_index = (i_size_read(inode) - 1) >> PAGE_CACHE_SHIFT; | |
254 | ||
255 | page_cache_sync_readahead(inode->i_mapping, ra, NULL, 0, last_index); | |
256 | ||
257 | kfree(ra); | |
258 | ||
259 | return 0; | |
260 | } | |
261 | ||
a67509c3 JB |
262 | struct io_ctl { |
263 | void *cur, *orig; | |
264 | struct page *page; | |
265 | struct page **pages; | |
266 | struct btrfs_root *root; | |
267 | unsigned long size; | |
268 | int index; | |
269 | int num_pages; | |
5b0e95bf | 270 | unsigned check_crcs:1; |
a67509c3 JB |
271 | }; |
272 | ||
273 | static int io_ctl_init(struct io_ctl *io_ctl, struct inode *inode, | |
274 | struct btrfs_root *root) | |
275 | { | |
276 | memset(io_ctl, 0, sizeof(struct io_ctl)); | |
277 | io_ctl->num_pages = (i_size_read(inode) + PAGE_CACHE_SIZE - 1) >> | |
278 | PAGE_CACHE_SHIFT; | |
279 | io_ctl->pages = kzalloc(sizeof(struct page *) * io_ctl->num_pages, | |
280 | GFP_NOFS); | |
281 | if (!io_ctl->pages) | |
282 | return -ENOMEM; | |
283 | io_ctl->root = root; | |
5b0e95bf JB |
284 | if (btrfs_ino(inode) != BTRFS_FREE_INO_OBJECTID) |
285 | io_ctl->check_crcs = 1; | |
a67509c3 JB |
286 | return 0; |
287 | } | |
288 | ||
289 | static void io_ctl_free(struct io_ctl *io_ctl) | |
290 | { | |
291 | kfree(io_ctl->pages); | |
292 | } | |
293 | ||
294 | static void io_ctl_unmap_page(struct io_ctl *io_ctl) | |
295 | { | |
296 | if (io_ctl->cur) { | |
297 | kunmap(io_ctl->page); | |
298 | io_ctl->cur = NULL; | |
299 | io_ctl->orig = NULL; | |
300 | } | |
301 | } | |
302 | ||
303 | static void io_ctl_map_page(struct io_ctl *io_ctl, int clear) | |
304 | { | |
305 | WARN_ON(io_ctl->cur); | |
306 | BUG_ON(io_ctl->index >= io_ctl->num_pages); | |
307 | io_ctl->page = io_ctl->pages[io_ctl->index++]; | |
308 | io_ctl->cur = kmap(io_ctl->page); | |
309 | io_ctl->orig = io_ctl->cur; | |
310 | io_ctl->size = PAGE_CACHE_SIZE; | |
311 | if (clear) | |
312 | memset(io_ctl->cur, 0, PAGE_CACHE_SIZE); | |
313 | } | |
314 | ||
315 | static void io_ctl_drop_pages(struct io_ctl *io_ctl) | |
316 | { | |
317 | int i; | |
318 | ||
319 | io_ctl_unmap_page(io_ctl); | |
320 | ||
321 | for (i = 0; i < io_ctl->num_pages; i++) { | |
322 | ClearPageChecked(io_ctl->pages[i]); | |
323 | unlock_page(io_ctl->pages[i]); | |
324 | page_cache_release(io_ctl->pages[i]); | |
325 | } | |
326 | } | |
327 | ||
328 | static int io_ctl_prepare_pages(struct io_ctl *io_ctl, struct inode *inode, | |
329 | int uptodate) | |
330 | { | |
331 | struct page *page; | |
332 | gfp_t mask = btrfs_alloc_write_mask(inode->i_mapping); | |
333 | int i; | |
334 | ||
335 | for (i = 0; i < io_ctl->num_pages; i++) { | |
336 | page = find_or_create_page(inode->i_mapping, i, mask); | |
337 | if (!page) { | |
338 | io_ctl_drop_pages(io_ctl); | |
339 | return -ENOMEM; | |
340 | } | |
341 | io_ctl->pages[i] = page; | |
342 | if (uptodate && !PageUptodate(page)) { | |
343 | btrfs_readpage(NULL, page); | |
344 | lock_page(page); | |
345 | if (!PageUptodate(page)) { | |
346 | printk(KERN_ERR "btrfs: error reading free " | |
347 | "space cache\n"); | |
348 | io_ctl_drop_pages(io_ctl); | |
349 | return -EIO; | |
350 | } | |
351 | } | |
352 | } | |
353 | ||
354 | return 0; | |
355 | } | |
356 | ||
357 | static void io_ctl_set_generation(struct io_ctl *io_ctl, u64 generation) | |
358 | { | |
359 | u64 *val; | |
360 | ||
361 | io_ctl_map_page(io_ctl, 1); | |
362 | ||
363 | /* | |
5b0e95bf JB |
364 | * Skip the csum areas. If we don't check crcs then we just have a |
365 | * 64bit chunk at the front of the first page. | |
a67509c3 | 366 | */ |
5b0e95bf JB |
367 | if (io_ctl->check_crcs) { |
368 | io_ctl->cur += (sizeof(u32) * io_ctl->num_pages); | |
369 | io_ctl->size -= sizeof(u64) + (sizeof(u32) * io_ctl->num_pages); | |
370 | } else { | |
371 | io_ctl->cur += sizeof(u64); | |
372 | io_ctl->size -= sizeof(u64) * 2; | |
373 | } | |
a67509c3 JB |
374 | |
375 | val = io_ctl->cur; | |
376 | *val = cpu_to_le64(generation); | |
377 | io_ctl->cur += sizeof(u64); | |
a67509c3 JB |
378 | } |
379 | ||
380 | static int io_ctl_check_generation(struct io_ctl *io_ctl, u64 generation) | |
381 | { | |
382 | u64 *gen; | |
383 | ||
5b0e95bf JB |
384 | /* |
385 | * Skip the crc area. If we don't check crcs then we just have a 64bit | |
386 | * chunk at the front of the first page. | |
387 | */ | |
388 | if (io_ctl->check_crcs) { | |
389 | io_ctl->cur += sizeof(u32) * io_ctl->num_pages; | |
390 | io_ctl->size -= sizeof(u64) + | |
391 | (sizeof(u32) * io_ctl->num_pages); | |
392 | } else { | |
393 | io_ctl->cur += sizeof(u64); | |
394 | io_ctl->size -= sizeof(u64) * 2; | |
395 | } | |
a67509c3 | 396 | |
a67509c3 JB |
397 | gen = io_ctl->cur; |
398 | if (le64_to_cpu(*gen) != generation) { | |
399 | printk_ratelimited(KERN_ERR "btrfs: space cache generation " | |
400 | "(%Lu) does not match inode (%Lu)\n", *gen, | |
401 | generation); | |
402 | io_ctl_unmap_page(io_ctl); | |
403 | return -EIO; | |
404 | } | |
405 | io_ctl->cur += sizeof(u64); | |
5b0e95bf JB |
406 | return 0; |
407 | } | |
408 | ||
409 | static void io_ctl_set_crc(struct io_ctl *io_ctl, int index) | |
410 | { | |
411 | u32 *tmp; | |
412 | u32 crc = ~(u32)0; | |
413 | unsigned offset = 0; | |
414 | ||
415 | if (!io_ctl->check_crcs) { | |
416 | io_ctl_unmap_page(io_ctl); | |
417 | return; | |
418 | } | |
419 | ||
420 | if (index == 0) | |
421 | offset = sizeof(u32) * io_ctl->num_pages;; | |
422 | ||
423 | crc = btrfs_csum_data(io_ctl->root, io_ctl->orig + offset, crc, | |
424 | PAGE_CACHE_SIZE - offset); | |
425 | btrfs_csum_final(crc, (char *)&crc); | |
426 | io_ctl_unmap_page(io_ctl); | |
427 | tmp = kmap(io_ctl->pages[0]); | |
428 | tmp += index; | |
429 | *tmp = crc; | |
430 | kunmap(io_ctl->pages[0]); | |
431 | } | |
432 | ||
433 | static int io_ctl_check_crc(struct io_ctl *io_ctl, int index) | |
434 | { | |
435 | u32 *tmp, val; | |
436 | u32 crc = ~(u32)0; | |
437 | unsigned offset = 0; | |
438 | ||
439 | if (!io_ctl->check_crcs) { | |
440 | io_ctl_map_page(io_ctl, 0); | |
441 | return 0; | |
442 | } | |
443 | ||
444 | if (index == 0) | |
445 | offset = sizeof(u32) * io_ctl->num_pages; | |
446 | ||
447 | tmp = kmap(io_ctl->pages[0]); | |
448 | tmp += index; | |
449 | val = *tmp; | |
450 | kunmap(io_ctl->pages[0]); | |
451 | ||
452 | io_ctl_map_page(io_ctl, 0); | |
453 | crc = btrfs_csum_data(io_ctl->root, io_ctl->orig + offset, crc, | |
454 | PAGE_CACHE_SIZE - offset); | |
455 | btrfs_csum_final(crc, (char *)&crc); | |
456 | if (val != crc) { | |
457 | printk_ratelimited(KERN_ERR "btrfs: csum mismatch on free " | |
458 | "space cache\n"); | |
459 | io_ctl_unmap_page(io_ctl); | |
460 | return -EIO; | |
461 | } | |
462 | ||
a67509c3 JB |
463 | return 0; |
464 | } | |
465 | ||
466 | static int io_ctl_add_entry(struct io_ctl *io_ctl, u64 offset, u64 bytes, | |
467 | void *bitmap) | |
468 | { | |
469 | struct btrfs_free_space_entry *entry; | |
470 | ||
471 | if (!io_ctl->cur) | |
472 | return -ENOSPC; | |
473 | ||
474 | entry = io_ctl->cur; | |
475 | entry->offset = cpu_to_le64(offset); | |
476 | entry->bytes = cpu_to_le64(bytes); | |
477 | entry->type = (bitmap) ? BTRFS_FREE_SPACE_BITMAP : | |
478 | BTRFS_FREE_SPACE_EXTENT; | |
479 | io_ctl->cur += sizeof(struct btrfs_free_space_entry); | |
480 | io_ctl->size -= sizeof(struct btrfs_free_space_entry); | |
481 | ||
482 | if (io_ctl->size >= sizeof(struct btrfs_free_space_entry)) | |
483 | return 0; | |
484 | ||
5b0e95bf | 485 | io_ctl_set_crc(io_ctl, io_ctl->index - 1); |
a67509c3 JB |
486 | |
487 | /* No more pages to map */ | |
488 | if (io_ctl->index >= io_ctl->num_pages) | |
489 | return 0; | |
490 | ||
491 | /* map the next page */ | |
492 | io_ctl_map_page(io_ctl, 1); | |
493 | return 0; | |
494 | } | |
495 | ||
496 | static int io_ctl_add_bitmap(struct io_ctl *io_ctl, void *bitmap) | |
497 | { | |
498 | if (!io_ctl->cur) | |
499 | return -ENOSPC; | |
500 | ||
501 | /* | |
502 | * If we aren't at the start of the current page, unmap this one and | |
503 | * map the next one if there is any left. | |
504 | */ | |
505 | if (io_ctl->cur != io_ctl->orig) { | |
5b0e95bf | 506 | io_ctl_set_crc(io_ctl, io_ctl->index - 1); |
a67509c3 JB |
507 | if (io_ctl->index >= io_ctl->num_pages) |
508 | return -ENOSPC; | |
509 | io_ctl_map_page(io_ctl, 0); | |
510 | } | |
511 | ||
512 | memcpy(io_ctl->cur, bitmap, PAGE_CACHE_SIZE); | |
5b0e95bf | 513 | io_ctl_set_crc(io_ctl, io_ctl->index - 1); |
a67509c3 JB |
514 | if (io_ctl->index < io_ctl->num_pages) |
515 | io_ctl_map_page(io_ctl, 0); | |
516 | return 0; | |
517 | } | |
518 | ||
519 | static void io_ctl_zero_remaining_pages(struct io_ctl *io_ctl) | |
520 | { | |
5b0e95bf JB |
521 | /* |
522 | * If we're not on the boundary we know we've modified the page and we | |
523 | * need to crc the page. | |
524 | */ | |
525 | if (io_ctl->cur != io_ctl->orig) | |
526 | io_ctl_set_crc(io_ctl, io_ctl->index - 1); | |
527 | else | |
528 | io_ctl_unmap_page(io_ctl); | |
a67509c3 JB |
529 | |
530 | while (io_ctl->index < io_ctl->num_pages) { | |
531 | io_ctl_map_page(io_ctl, 1); | |
5b0e95bf | 532 | io_ctl_set_crc(io_ctl, io_ctl->index - 1); |
a67509c3 JB |
533 | } |
534 | } | |
535 | ||
5b0e95bf JB |
536 | static int io_ctl_read_entry(struct io_ctl *io_ctl, |
537 | struct btrfs_free_space *entry, u8 *type) | |
a67509c3 JB |
538 | { |
539 | struct btrfs_free_space_entry *e; | |
2f120c05 JB |
540 | int ret; |
541 | ||
542 | if (!io_ctl->cur) { | |
543 | ret = io_ctl_check_crc(io_ctl, io_ctl->index); | |
544 | if (ret) | |
545 | return ret; | |
546 | } | |
a67509c3 JB |
547 | |
548 | e = io_ctl->cur; | |
549 | entry->offset = le64_to_cpu(e->offset); | |
550 | entry->bytes = le64_to_cpu(e->bytes); | |
5b0e95bf | 551 | *type = e->type; |
a67509c3 JB |
552 | io_ctl->cur += sizeof(struct btrfs_free_space_entry); |
553 | io_ctl->size -= sizeof(struct btrfs_free_space_entry); | |
554 | ||
555 | if (io_ctl->size >= sizeof(struct btrfs_free_space_entry)) | |
5b0e95bf | 556 | return 0; |
a67509c3 JB |
557 | |
558 | io_ctl_unmap_page(io_ctl); | |
559 | ||
2f120c05 | 560 | return 0; |
a67509c3 JB |
561 | } |
562 | ||
5b0e95bf JB |
563 | static int io_ctl_read_bitmap(struct io_ctl *io_ctl, |
564 | struct btrfs_free_space *entry) | |
a67509c3 | 565 | { |
5b0e95bf JB |
566 | int ret; |
567 | ||
5b0e95bf JB |
568 | ret = io_ctl_check_crc(io_ctl, io_ctl->index); |
569 | if (ret) | |
570 | return ret; | |
571 | ||
a67509c3 JB |
572 | memcpy(entry->bitmap, io_ctl->cur, PAGE_CACHE_SIZE); |
573 | io_ctl_unmap_page(io_ctl); | |
5b0e95bf JB |
574 | |
575 | return 0; | |
a67509c3 JB |
576 | } |
577 | ||
0414efae LZ |
578 | int __load_free_space_cache(struct btrfs_root *root, struct inode *inode, |
579 | struct btrfs_free_space_ctl *ctl, | |
580 | struct btrfs_path *path, u64 offset) | |
9d66e233 | 581 | { |
9d66e233 JB |
582 | struct btrfs_free_space_header *header; |
583 | struct extent_buffer *leaf; | |
a67509c3 | 584 | struct io_ctl io_ctl; |
9d66e233 | 585 | struct btrfs_key key; |
a67509c3 | 586 | struct btrfs_free_space *e, *n; |
9d66e233 JB |
587 | struct list_head bitmaps; |
588 | u64 num_entries; | |
589 | u64 num_bitmaps; | |
590 | u64 generation; | |
a67509c3 | 591 | u8 type; |
f6a39829 | 592 | int ret = 0; |
9d66e233 JB |
593 | |
594 | INIT_LIST_HEAD(&bitmaps); | |
595 | ||
9d66e233 | 596 | /* Nothing in the space cache, goodbye */ |
0414efae | 597 | if (!i_size_read(inode)) |
a67509c3 | 598 | return 0; |
9d66e233 JB |
599 | |
600 | key.objectid = BTRFS_FREE_SPACE_OBJECTID; | |
0414efae | 601 | key.offset = offset; |
9d66e233 JB |
602 | key.type = 0; |
603 | ||
604 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); | |
0414efae | 605 | if (ret < 0) |
a67509c3 | 606 | return 0; |
0414efae | 607 | else if (ret > 0) { |
945d8962 | 608 | btrfs_release_path(path); |
a67509c3 | 609 | return 0; |
9d66e233 JB |
610 | } |
611 | ||
0414efae LZ |
612 | ret = -1; |
613 | ||
9d66e233 JB |
614 | leaf = path->nodes[0]; |
615 | header = btrfs_item_ptr(leaf, path->slots[0], | |
616 | struct btrfs_free_space_header); | |
617 | num_entries = btrfs_free_space_entries(leaf, header); | |
618 | num_bitmaps = btrfs_free_space_bitmaps(leaf, header); | |
619 | generation = btrfs_free_space_generation(leaf, header); | |
945d8962 | 620 | btrfs_release_path(path); |
9d66e233 JB |
621 | |
622 | if (BTRFS_I(inode)->generation != generation) { | |
623 | printk(KERN_ERR "btrfs: free space inode generation (%llu) did" | |
0414efae | 624 | " not match free space cache generation (%llu)\n", |
9d66e233 | 625 | (unsigned long long)BTRFS_I(inode)->generation, |
0414efae | 626 | (unsigned long long)generation); |
a67509c3 | 627 | return 0; |
9d66e233 JB |
628 | } |
629 | ||
630 | if (!num_entries) | |
a67509c3 | 631 | return 0; |
9d66e233 | 632 | |
a67509c3 | 633 | io_ctl_init(&io_ctl, inode, root); |
9d66e233 | 634 | ret = readahead_cache(inode); |
0414efae | 635 | if (ret) |
9d66e233 | 636 | goto out; |
9d66e233 | 637 | |
a67509c3 JB |
638 | ret = io_ctl_prepare_pages(&io_ctl, inode, 1); |
639 | if (ret) | |
640 | goto out; | |
9d66e233 | 641 | |
5b0e95bf JB |
642 | ret = io_ctl_check_crc(&io_ctl, 0); |
643 | if (ret) | |
644 | goto free_cache; | |
645 | ||
a67509c3 JB |
646 | ret = io_ctl_check_generation(&io_ctl, generation); |
647 | if (ret) | |
648 | goto free_cache; | |
9d66e233 | 649 | |
a67509c3 JB |
650 | while (num_entries) { |
651 | e = kmem_cache_zalloc(btrfs_free_space_cachep, | |
652 | GFP_NOFS); | |
653 | if (!e) | |
9d66e233 | 654 | goto free_cache; |
9d66e233 | 655 | |
5b0e95bf JB |
656 | ret = io_ctl_read_entry(&io_ctl, e, &type); |
657 | if (ret) { | |
658 | kmem_cache_free(btrfs_free_space_cachep, e); | |
659 | goto free_cache; | |
660 | } | |
661 | ||
a67509c3 JB |
662 | if (!e->bytes) { |
663 | kmem_cache_free(btrfs_free_space_cachep, e); | |
664 | goto free_cache; | |
9d66e233 | 665 | } |
a67509c3 JB |
666 | |
667 | if (type == BTRFS_FREE_SPACE_EXTENT) { | |
668 | spin_lock(&ctl->tree_lock); | |
669 | ret = link_free_space(ctl, e); | |
670 | spin_unlock(&ctl->tree_lock); | |
671 | if (ret) { | |
672 | printk(KERN_ERR "Duplicate entries in " | |
673 | "free space cache, dumping\n"); | |
674 | kmem_cache_free(btrfs_free_space_cachep, e); | |
9d66e233 JB |
675 | goto free_cache; |
676 | } | |
a67509c3 JB |
677 | } else { |
678 | BUG_ON(!num_bitmaps); | |
679 | num_bitmaps--; | |
680 | e->bitmap = kzalloc(PAGE_CACHE_SIZE, GFP_NOFS); | |
681 | if (!e->bitmap) { | |
682 | kmem_cache_free( | |
683 | btrfs_free_space_cachep, e); | |
9d66e233 JB |
684 | goto free_cache; |
685 | } | |
a67509c3 JB |
686 | spin_lock(&ctl->tree_lock); |
687 | ret = link_free_space(ctl, e); | |
688 | ctl->total_bitmaps++; | |
689 | ctl->op->recalc_thresholds(ctl); | |
690 | spin_unlock(&ctl->tree_lock); | |
691 | if (ret) { | |
692 | printk(KERN_ERR "Duplicate entries in " | |
693 | "free space cache, dumping\n"); | |
dc89e982 | 694 | kmem_cache_free(btrfs_free_space_cachep, e); |
9d66e233 JB |
695 | goto free_cache; |
696 | } | |
a67509c3 | 697 | list_add_tail(&e->list, &bitmaps); |
9d66e233 JB |
698 | } |
699 | ||
a67509c3 JB |
700 | num_entries--; |
701 | } | |
9d66e233 | 702 | |
2f120c05 JB |
703 | io_ctl_unmap_page(&io_ctl); |
704 | ||
a67509c3 JB |
705 | /* |
706 | * We add the bitmaps at the end of the entries in order that | |
707 | * the bitmap entries are added to the cache. | |
708 | */ | |
709 | list_for_each_entry_safe(e, n, &bitmaps, list) { | |
9d66e233 | 710 | list_del_init(&e->list); |
5b0e95bf JB |
711 | ret = io_ctl_read_bitmap(&io_ctl, e); |
712 | if (ret) | |
713 | goto free_cache; | |
9d66e233 JB |
714 | } |
715 | ||
a67509c3 | 716 | io_ctl_drop_pages(&io_ctl); |
9d66e233 JB |
717 | ret = 1; |
718 | out: | |
a67509c3 | 719 | io_ctl_free(&io_ctl); |
9d66e233 | 720 | return ret; |
9d66e233 | 721 | free_cache: |
a67509c3 | 722 | io_ctl_drop_pages(&io_ctl); |
0414efae | 723 | __btrfs_remove_free_space_cache(ctl); |
9d66e233 JB |
724 | goto out; |
725 | } | |
726 | ||
0414efae LZ |
727 | int load_free_space_cache(struct btrfs_fs_info *fs_info, |
728 | struct btrfs_block_group_cache *block_group) | |
0cb59c99 | 729 | { |
34d52cb6 | 730 | struct btrfs_free_space_ctl *ctl = block_group->free_space_ctl; |
0414efae LZ |
731 | struct btrfs_root *root = fs_info->tree_root; |
732 | struct inode *inode; | |
733 | struct btrfs_path *path; | |
5b0e95bf | 734 | int ret = 0; |
0414efae LZ |
735 | bool matched; |
736 | u64 used = btrfs_block_group_used(&block_group->item); | |
737 | ||
738 | /* | |
739 | * If we're unmounting then just return, since this does a search on the | |
740 | * normal root and not the commit root and we could deadlock. | |
741 | */ | |
7841cb28 | 742 | if (btrfs_fs_closing(fs_info)) |
0414efae LZ |
743 | return 0; |
744 | ||
745 | /* | |
746 | * If this block group has been marked to be cleared for one reason or | |
747 | * another then we can't trust the on disk cache, so just return. | |
748 | */ | |
9d66e233 | 749 | spin_lock(&block_group->lock); |
0414efae LZ |
750 | if (block_group->disk_cache_state != BTRFS_DC_WRITTEN) { |
751 | spin_unlock(&block_group->lock); | |
752 | return 0; | |
753 | } | |
9d66e233 | 754 | spin_unlock(&block_group->lock); |
0414efae LZ |
755 | |
756 | path = btrfs_alloc_path(); | |
757 | if (!path) | |
758 | return 0; | |
759 | ||
760 | inode = lookup_free_space_inode(root, block_group, path); | |
761 | if (IS_ERR(inode)) { | |
762 | btrfs_free_path(path); | |
763 | return 0; | |
764 | } | |
765 | ||
5b0e95bf JB |
766 | /* We may have converted the inode and made the cache invalid. */ |
767 | spin_lock(&block_group->lock); | |
768 | if (block_group->disk_cache_state != BTRFS_DC_WRITTEN) { | |
769 | spin_unlock(&block_group->lock); | |
770 | goto out; | |
771 | } | |
772 | spin_unlock(&block_group->lock); | |
773 | ||
0414efae LZ |
774 | ret = __load_free_space_cache(fs_info->tree_root, inode, ctl, |
775 | path, block_group->key.objectid); | |
776 | btrfs_free_path(path); | |
777 | if (ret <= 0) | |
778 | goto out; | |
779 | ||
780 | spin_lock(&ctl->tree_lock); | |
781 | matched = (ctl->free_space == (block_group->key.offset - used - | |
782 | block_group->bytes_super)); | |
783 | spin_unlock(&ctl->tree_lock); | |
784 | ||
785 | if (!matched) { | |
786 | __btrfs_remove_free_space_cache(ctl); | |
787 | printk(KERN_ERR "block group %llu has an wrong amount of free " | |
788 | "space\n", block_group->key.objectid); | |
789 | ret = -1; | |
790 | } | |
791 | out: | |
792 | if (ret < 0) { | |
793 | /* This cache is bogus, make sure it gets cleared */ | |
794 | spin_lock(&block_group->lock); | |
795 | block_group->disk_cache_state = BTRFS_DC_CLEAR; | |
796 | spin_unlock(&block_group->lock); | |
82d5902d | 797 | ret = 0; |
0414efae LZ |
798 | |
799 | printk(KERN_ERR "btrfs: failed to load free space cache " | |
800 | "for block group %llu\n", block_group->key.objectid); | |
801 | } | |
802 | ||
803 | iput(inode); | |
804 | return ret; | |
9d66e233 JB |
805 | } |
806 | ||
c09544e0 JB |
807 | /** |
808 | * __btrfs_write_out_cache - write out cached info to an inode | |
809 | * @root - the root the inode belongs to | |
810 | * @ctl - the free space cache we are going to write out | |
811 | * @block_group - the block_group for this cache if it belongs to a block_group | |
812 | * @trans - the trans handle | |
813 | * @path - the path to use | |
814 | * @offset - the offset for the key we'll insert | |
815 | * | |
816 | * This function writes out a free space cache struct to disk for quick recovery | |
817 | * on mount. This will return 0 if it was successfull in writing the cache out, | |
818 | * and -1 if it was not. | |
819 | */ | |
0414efae LZ |
820 | int __btrfs_write_out_cache(struct btrfs_root *root, struct inode *inode, |
821 | struct btrfs_free_space_ctl *ctl, | |
822 | struct btrfs_block_group_cache *block_group, | |
823 | struct btrfs_trans_handle *trans, | |
824 | struct btrfs_path *path, u64 offset) | |
0cb59c99 JB |
825 | { |
826 | struct btrfs_free_space_header *header; | |
827 | struct extent_buffer *leaf; | |
0cb59c99 JB |
828 | struct rb_node *node; |
829 | struct list_head *pos, *n; | |
0cb59c99 | 830 | struct extent_state *cached_state = NULL; |
43be2146 JB |
831 | struct btrfs_free_cluster *cluster = NULL; |
832 | struct extent_io_tree *unpin = NULL; | |
a67509c3 | 833 | struct io_ctl io_ctl; |
0cb59c99 JB |
834 | struct list_head bitmap_list; |
835 | struct btrfs_key key; | |
43be2146 | 836 | u64 start, end, len; |
0cb59c99 JB |
837 | int entries = 0; |
838 | int bitmaps = 0; | |
c09544e0 JB |
839 | int ret; |
840 | int err = -1; | |
0cb59c99 | 841 | |
0cb59c99 JB |
842 | INIT_LIST_HEAD(&bitmap_list); |
843 | ||
0414efae LZ |
844 | if (!i_size_read(inode)) |
845 | return -1; | |
2b20982e | 846 | |
a67509c3 | 847 | io_ctl_init(&io_ctl, inode, root); |
be1a12a0 | 848 | |
43be2146 | 849 | /* Get the cluster for this block_group if it exists */ |
0414efae | 850 | if (block_group && !list_empty(&block_group->cluster_list)) |
43be2146 JB |
851 | cluster = list_entry(block_group->cluster_list.next, |
852 | struct btrfs_free_cluster, | |
853 | block_group_list); | |
854 | ||
855 | /* | |
856 | * We shouldn't have switched the pinned extents yet so this is the | |
857 | * right one | |
858 | */ | |
859 | unpin = root->fs_info->pinned_extents; | |
860 | ||
a67509c3 JB |
861 | /* Lock all pages first so we can lock the extent safely. */ |
862 | io_ctl_prepare_pages(&io_ctl, inode, 0); | |
0cb59c99 | 863 | |
0cb59c99 JB |
864 | lock_extent_bits(&BTRFS_I(inode)->io_tree, 0, i_size_read(inode) - 1, |
865 | 0, &cached_state, GFP_NOFS); | |
866 | ||
43be2146 JB |
867 | /* |
868 | * When searching for pinned extents, we need to start at our start | |
869 | * offset. | |
870 | */ | |
0414efae LZ |
871 | if (block_group) |
872 | start = block_group->key.objectid; | |
43be2146 | 873 | |
f75b130e JB |
874 | node = rb_first(&ctl->free_space_offset); |
875 | if (!node && cluster) { | |
876 | node = rb_first(&cluster->root); | |
877 | cluster = NULL; | |
878 | } | |
879 | ||
5b0e95bf JB |
880 | /* Make sure we can fit our crcs into the first page */ |
881 | if (io_ctl.check_crcs && | |
882 | (io_ctl.num_pages * sizeof(u32)) >= PAGE_CACHE_SIZE) { | |
883 | WARN_ON(1); | |
884 | goto out_nospc; | |
885 | } | |
886 | ||
a67509c3 | 887 | io_ctl_set_generation(&io_ctl, trans->transid); |
43be2146 | 888 | |
a67509c3 JB |
889 | /* Write out the extent entries */ |
890 | while (node) { | |
891 | struct btrfs_free_space *e; | |
0cb59c99 | 892 | |
a67509c3 JB |
893 | e = rb_entry(node, struct btrfs_free_space, offset_index); |
894 | entries++; | |
0cb59c99 | 895 | |
a67509c3 JB |
896 | ret = io_ctl_add_entry(&io_ctl, e->offset, e->bytes, |
897 | e->bitmap); | |
898 | if (ret) | |
899 | goto out_nospc; | |
2f356126 | 900 | |
a67509c3 JB |
901 | if (e->bitmap) { |
902 | list_add_tail(&e->list, &bitmap_list); | |
903 | bitmaps++; | |
2f356126 | 904 | } |
a67509c3 JB |
905 | node = rb_next(node); |
906 | if (!node && cluster) { | |
907 | node = rb_first(&cluster->root); | |
908 | cluster = NULL; | |
43be2146 | 909 | } |
a67509c3 | 910 | } |
43be2146 | 911 | |
a67509c3 JB |
912 | /* |
913 | * We want to add any pinned extents to our free space cache | |
914 | * so we don't leak the space | |
915 | */ | |
916 | while (block_group && (start < block_group->key.objectid + | |
917 | block_group->key.offset)) { | |
918 | ret = find_first_extent_bit(unpin, start, &start, &end, | |
919 | EXTENT_DIRTY); | |
920 | if (ret) { | |
921 | ret = 0; | |
922 | break; | |
0cb59c99 | 923 | } |
0cb59c99 | 924 | |
a67509c3 JB |
925 | /* This pinned extent is out of our range */ |
926 | if (start >= block_group->key.objectid + | |
927 | block_group->key.offset) | |
928 | break; | |
2f356126 | 929 | |
a67509c3 JB |
930 | len = block_group->key.objectid + |
931 | block_group->key.offset - start; | |
932 | len = min(len, end + 1 - start); | |
0cb59c99 | 933 | |
a67509c3 JB |
934 | entries++; |
935 | ret = io_ctl_add_entry(&io_ctl, start, len, NULL); | |
936 | if (ret) | |
937 | goto out_nospc; | |
0cb59c99 | 938 | |
a67509c3 JB |
939 | start = end + 1; |
940 | } | |
0cb59c99 JB |
941 | |
942 | /* Write out the bitmaps */ | |
943 | list_for_each_safe(pos, n, &bitmap_list) { | |
0cb59c99 JB |
944 | struct btrfs_free_space *entry = |
945 | list_entry(pos, struct btrfs_free_space, list); | |
946 | ||
a67509c3 JB |
947 | ret = io_ctl_add_bitmap(&io_ctl, entry->bitmap); |
948 | if (ret) | |
949 | goto out_nospc; | |
0cb59c99 | 950 | list_del_init(&entry->list); |
be1a12a0 JB |
951 | } |
952 | ||
0cb59c99 | 953 | /* Zero out the rest of the pages just to make sure */ |
a67509c3 | 954 | io_ctl_zero_remaining_pages(&io_ctl); |
0cb59c99 | 955 | |
a67509c3 JB |
956 | ret = btrfs_dirty_pages(root, inode, io_ctl.pages, io_ctl.num_pages, |
957 | 0, i_size_read(inode), &cached_state); | |
958 | io_ctl_drop_pages(&io_ctl); | |
0cb59c99 JB |
959 | unlock_extent_cached(&BTRFS_I(inode)->io_tree, 0, |
960 | i_size_read(inode) - 1, &cached_state, GFP_NOFS); | |
961 | ||
c09544e0 | 962 | if (ret) |
2f356126 | 963 | goto out; |
be1a12a0 | 964 | |
be1a12a0 | 965 | |
549b4fdb JB |
966 | ret = filemap_write_and_wait(inode->i_mapping); |
967 | if (ret) | |
968 | goto out; | |
0cb59c99 JB |
969 | |
970 | key.objectid = BTRFS_FREE_SPACE_OBJECTID; | |
0414efae | 971 | key.offset = offset; |
0cb59c99 JB |
972 | key.type = 0; |
973 | ||
a9b5fcdd | 974 | ret = btrfs_search_slot(trans, root, &key, path, 0, 1); |
0cb59c99 | 975 | if (ret < 0) { |
a67509c3 | 976 | clear_extent_bit(&BTRFS_I(inode)->io_tree, 0, inode->i_size - 1, |
5b0e95bf JB |
977 | EXTENT_DIRTY | EXTENT_DELALLOC, 0, 0, NULL, |
978 | GFP_NOFS); | |
2f356126 | 979 | goto out; |
0cb59c99 JB |
980 | } |
981 | leaf = path->nodes[0]; | |
982 | if (ret > 0) { | |
983 | struct btrfs_key found_key; | |
984 | BUG_ON(!path->slots[0]); | |
985 | path->slots[0]--; | |
986 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); | |
987 | if (found_key.objectid != BTRFS_FREE_SPACE_OBJECTID || | |
0414efae | 988 | found_key.offset != offset) { |
a67509c3 JB |
989 | clear_extent_bit(&BTRFS_I(inode)->io_tree, 0, |
990 | inode->i_size - 1, | |
5b0e95bf JB |
991 | EXTENT_DIRTY | EXTENT_DELALLOC, 0, 0, |
992 | NULL, GFP_NOFS); | |
b3b4aa74 | 993 | btrfs_release_path(path); |
2f356126 | 994 | goto out; |
0cb59c99 JB |
995 | } |
996 | } | |
549b4fdb JB |
997 | |
998 | BTRFS_I(inode)->generation = trans->transid; | |
0cb59c99 JB |
999 | header = btrfs_item_ptr(leaf, path->slots[0], |
1000 | struct btrfs_free_space_header); | |
1001 | btrfs_set_free_space_entries(leaf, header, entries); | |
1002 | btrfs_set_free_space_bitmaps(leaf, header, bitmaps); | |
1003 | btrfs_set_free_space_generation(leaf, header, trans->transid); | |
1004 | btrfs_mark_buffer_dirty(leaf); | |
b3b4aa74 | 1005 | btrfs_release_path(path); |
0cb59c99 | 1006 | |
c09544e0 | 1007 | err = 0; |
2f356126 | 1008 | out: |
a67509c3 | 1009 | io_ctl_free(&io_ctl); |
c09544e0 | 1010 | if (err) { |
a67509c3 | 1011 | invalidate_inode_pages2(inode->i_mapping); |
0cb59c99 JB |
1012 | BTRFS_I(inode)->generation = 0; |
1013 | } | |
0cb59c99 | 1014 | btrfs_update_inode(trans, root, inode); |
c09544e0 | 1015 | return err; |
a67509c3 JB |
1016 | |
1017 | out_nospc: | |
1018 | list_for_each_safe(pos, n, &bitmap_list) { | |
1019 | struct btrfs_free_space *entry = | |
1020 | list_entry(pos, struct btrfs_free_space, list); | |
1021 | list_del_init(&entry->list); | |
1022 | } | |
1023 | io_ctl_drop_pages(&io_ctl); | |
1024 | unlock_extent_cached(&BTRFS_I(inode)->io_tree, 0, | |
1025 | i_size_read(inode) - 1, &cached_state, GFP_NOFS); | |
1026 | goto out; | |
0414efae LZ |
1027 | } |
1028 | ||
1029 | int btrfs_write_out_cache(struct btrfs_root *root, | |
1030 | struct btrfs_trans_handle *trans, | |
1031 | struct btrfs_block_group_cache *block_group, | |
1032 | struct btrfs_path *path) | |
1033 | { | |
1034 | struct btrfs_free_space_ctl *ctl = block_group->free_space_ctl; | |
1035 | struct inode *inode; | |
1036 | int ret = 0; | |
1037 | ||
1038 | root = root->fs_info->tree_root; | |
1039 | ||
1040 | spin_lock(&block_group->lock); | |
1041 | if (block_group->disk_cache_state < BTRFS_DC_SETUP) { | |
1042 | spin_unlock(&block_group->lock); | |
1043 | return 0; | |
1044 | } | |
1045 | spin_unlock(&block_group->lock); | |
1046 | ||
1047 | inode = lookup_free_space_inode(root, block_group, path); | |
1048 | if (IS_ERR(inode)) | |
1049 | return 0; | |
1050 | ||
1051 | ret = __btrfs_write_out_cache(root, inode, ctl, block_group, trans, | |
1052 | path, block_group->key.objectid); | |
c09544e0 | 1053 | if (ret) { |
0414efae LZ |
1054 | spin_lock(&block_group->lock); |
1055 | block_group->disk_cache_state = BTRFS_DC_ERROR; | |
1056 | spin_unlock(&block_group->lock); | |
82d5902d | 1057 | ret = 0; |
c09544e0 | 1058 | #ifdef DEBUG |
0414efae LZ |
1059 | printk(KERN_ERR "btrfs: failed to write free space cace " |
1060 | "for block group %llu\n", block_group->key.objectid); | |
c09544e0 | 1061 | #endif |
0414efae LZ |
1062 | } |
1063 | ||
0cb59c99 JB |
1064 | iput(inode); |
1065 | return ret; | |
1066 | } | |
1067 | ||
34d52cb6 | 1068 | static inline unsigned long offset_to_bit(u64 bitmap_start, u32 unit, |
96303081 | 1069 | u64 offset) |
0f9dd46c | 1070 | { |
96303081 JB |
1071 | BUG_ON(offset < bitmap_start); |
1072 | offset -= bitmap_start; | |
34d52cb6 | 1073 | return (unsigned long)(div_u64(offset, unit)); |
96303081 | 1074 | } |
0f9dd46c | 1075 | |
34d52cb6 | 1076 | static inline unsigned long bytes_to_bits(u64 bytes, u32 unit) |
96303081 | 1077 | { |
34d52cb6 | 1078 | return (unsigned long)(div_u64(bytes, unit)); |
96303081 | 1079 | } |
0f9dd46c | 1080 | |
34d52cb6 | 1081 | static inline u64 offset_to_bitmap(struct btrfs_free_space_ctl *ctl, |
96303081 JB |
1082 | u64 offset) |
1083 | { | |
1084 | u64 bitmap_start; | |
1085 | u64 bytes_per_bitmap; | |
0f9dd46c | 1086 | |
34d52cb6 LZ |
1087 | bytes_per_bitmap = BITS_PER_BITMAP * ctl->unit; |
1088 | bitmap_start = offset - ctl->start; | |
96303081 JB |
1089 | bitmap_start = div64_u64(bitmap_start, bytes_per_bitmap); |
1090 | bitmap_start *= bytes_per_bitmap; | |
34d52cb6 | 1091 | bitmap_start += ctl->start; |
0f9dd46c | 1092 | |
96303081 | 1093 | return bitmap_start; |
0f9dd46c JB |
1094 | } |
1095 | ||
96303081 JB |
1096 | static int tree_insert_offset(struct rb_root *root, u64 offset, |
1097 | struct rb_node *node, int bitmap) | |
0f9dd46c JB |
1098 | { |
1099 | struct rb_node **p = &root->rb_node; | |
1100 | struct rb_node *parent = NULL; | |
1101 | struct btrfs_free_space *info; | |
1102 | ||
1103 | while (*p) { | |
1104 | parent = *p; | |
96303081 | 1105 | info = rb_entry(parent, struct btrfs_free_space, offset_index); |
0f9dd46c | 1106 | |
96303081 | 1107 | if (offset < info->offset) { |
0f9dd46c | 1108 | p = &(*p)->rb_left; |
96303081 | 1109 | } else if (offset > info->offset) { |
0f9dd46c | 1110 | p = &(*p)->rb_right; |
96303081 JB |
1111 | } else { |
1112 | /* | |
1113 | * we could have a bitmap entry and an extent entry | |
1114 | * share the same offset. If this is the case, we want | |
1115 | * the extent entry to always be found first if we do a | |
1116 | * linear search through the tree, since we want to have | |
1117 | * the quickest allocation time, and allocating from an | |
1118 | * extent is faster than allocating from a bitmap. So | |
1119 | * if we're inserting a bitmap and we find an entry at | |
1120 | * this offset, we want to go right, or after this entry | |
1121 | * logically. If we are inserting an extent and we've | |
1122 | * found a bitmap, we want to go left, or before | |
1123 | * logically. | |
1124 | */ | |
1125 | if (bitmap) { | |
207dde82 JB |
1126 | if (info->bitmap) { |
1127 | WARN_ON_ONCE(1); | |
1128 | return -EEXIST; | |
1129 | } | |
96303081 JB |
1130 | p = &(*p)->rb_right; |
1131 | } else { | |
207dde82 JB |
1132 | if (!info->bitmap) { |
1133 | WARN_ON_ONCE(1); | |
1134 | return -EEXIST; | |
1135 | } | |
96303081 JB |
1136 | p = &(*p)->rb_left; |
1137 | } | |
1138 | } | |
0f9dd46c JB |
1139 | } |
1140 | ||
1141 | rb_link_node(node, parent, p); | |
1142 | rb_insert_color(node, root); | |
1143 | ||
1144 | return 0; | |
1145 | } | |
1146 | ||
1147 | /* | |
70cb0743 JB |
1148 | * searches the tree for the given offset. |
1149 | * | |
96303081 JB |
1150 | * fuzzy - If this is set, then we are trying to make an allocation, and we just |
1151 | * want a section that has at least bytes size and comes at or after the given | |
1152 | * offset. | |
0f9dd46c | 1153 | */ |
96303081 | 1154 | static struct btrfs_free_space * |
34d52cb6 | 1155 | tree_search_offset(struct btrfs_free_space_ctl *ctl, |
96303081 | 1156 | u64 offset, int bitmap_only, int fuzzy) |
0f9dd46c | 1157 | { |
34d52cb6 | 1158 | struct rb_node *n = ctl->free_space_offset.rb_node; |
96303081 JB |
1159 | struct btrfs_free_space *entry, *prev = NULL; |
1160 | ||
1161 | /* find entry that is closest to the 'offset' */ | |
1162 | while (1) { | |
1163 | if (!n) { | |
1164 | entry = NULL; | |
1165 | break; | |
1166 | } | |
0f9dd46c | 1167 | |
0f9dd46c | 1168 | entry = rb_entry(n, struct btrfs_free_space, offset_index); |
96303081 | 1169 | prev = entry; |
0f9dd46c | 1170 | |
96303081 | 1171 | if (offset < entry->offset) |
0f9dd46c | 1172 | n = n->rb_left; |
96303081 | 1173 | else if (offset > entry->offset) |
0f9dd46c | 1174 | n = n->rb_right; |
96303081 | 1175 | else |
0f9dd46c | 1176 | break; |
0f9dd46c JB |
1177 | } |
1178 | ||
96303081 JB |
1179 | if (bitmap_only) { |
1180 | if (!entry) | |
1181 | return NULL; | |
1182 | if (entry->bitmap) | |
1183 | return entry; | |
0f9dd46c | 1184 | |
96303081 JB |
1185 | /* |
1186 | * bitmap entry and extent entry may share same offset, | |
1187 | * in that case, bitmap entry comes after extent entry. | |
1188 | */ | |
1189 | n = rb_next(n); | |
1190 | if (!n) | |
1191 | return NULL; | |
1192 | entry = rb_entry(n, struct btrfs_free_space, offset_index); | |
1193 | if (entry->offset != offset) | |
1194 | return NULL; | |
0f9dd46c | 1195 | |
96303081 JB |
1196 | WARN_ON(!entry->bitmap); |
1197 | return entry; | |
1198 | } else if (entry) { | |
1199 | if (entry->bitmap) { | |
0f9dd46c | 1200 | /* |
96303081 JB |
1201 | * if previous extent entry covers the offset, |
1202 | * we should return it instead of the bitmap entry | |
0f9dd46c | 1203 | */ |
96303081 JB |
1204 | n = &entry->offset_index; |
1205 | while (1) { | |
1206 | n = rb_prev(n); | |
1207 | if (!n) | |
1208 | break; | |
1209 | prev = rb_entry(n, struct btrfs_free_space, | |
1210 | offset_index); | |
1211 | if (!prev->bitmap) { | |
1212 | if (prev->offset + prev->bytes > offset) | |
1213 | entry = prev; | |
1214 | break; | |
1215 | } | |
0f9dd46c | 1216 | } |
96303081 JB |
1217 | } |
1218 | return entry; | |
1219 | } | |
1220 | ||
1221 | if (!prev) | |
1222 | return NULL; | |
1223 | ||
1224 | /* find last entry before the 'offset' */ | |
1225 | entry = prev; | |
1226 | if (entry->offset > offset) { | |
1227 | n = rb_prev(&entry->offset_index); | |
1228 | if (n) { | |
1229 | entry = rb_entry(n, struct btrfs_free_space, | |
1230 | offset_index); | |
1231 | BUG_ON(entry->offset > offset); | |
0f9dd46c | 1232 | } else { |
96303081 JB |
1233 | if (fuzzy) |
1234 | return entry; | |
1235 | else | |
1236 | return NULL; | |
0f9dd46c JB |
1237 | } |
1238 | } | |
1239 | ||
96303081 JB |
1240 | if (entry->bitmap) { |
1241 | n = &entry->offset_index; | |
1242 | while (1) { | |
1243 | n = rb_prev(n); | |
1244 | if (!n) | |
1245 | break; | |
1246 | prev = rb_entry(n, struct btrfs_free_space, | |
1247 | offset_index); | |
1248 | if (!prev->bitmap) { | |
1249 | if (prev->offset + prev->bytes > offset) | |
1250 | return prev; | |
1251 | break; | |
1252 | } | |
1253 | } | |
34d52cb6 | 1254 | if (entry->offset + BITS_PER_BITMAP * ctl->unit > offset) |
96303081 JB |
1255 | return entry; |
1256 | } else if (entry->offset + entry->bytes > offset) | |
1257 | return entry; | |
1258 | ||
1259 | if (!fuzzy) | |
1260 | return NULL; | |
1261 | ||
1262 | while (1) { | |
1263 | if (entry->bitmap) { | |
1264 | if (entry->offset + BITS_PER_BITMAP * | |
34d52cb6 | 1265 | ctl->unit > offset) |
96303081 JB |
1266 | break; |
1267 | } else { | |
1268 | if (entry->offset + entry->bytes > offset) | |
1269 | break; | |
1270 | } | |
1271 | ||
1272 | n = rb_next(&entry->offset_index); | |
1273 | if (!n) | |
1274 | return NULL; | |
1275 | entry = rb_entry(n, struct btrfs_free_space, offset_index); | |
1276 | } | |
1277 | return entry; | |
0f9dd46c JB |
1278 | } |
1279 | ||
f333adb5 | 1280 | static inline void |
34d52cb6 | 1281 | __unlink_free_space(struct btrfs_free_space_ctl *ctl, |
f333adb5 | 1282 | struct btrfs_free_space *info) |
0f9dd46c | 1283 | { |
34d52cb6 LZ |
1284 | rb_erase(&info->offset_index, &ctl->free_space_offset); |
1285 | ctl->free_extents--; | |
f333adb5 LZ |
1286 | } |
1287 | ||
34d52cb6 | 1288 | static void unlink_free_space(struct btrfs_free_space_ctl *ctl, |
f333adb5 LZ |
1289 | struct btrfs_free_space *info) |
1290 | { | |
34d52cb6 LZ |
1291 | __unlink_free_space(ctl, info); |
1292 | ctl->free_space -= info->bytes; | |
0f9dd46c JB |
1293 | } |
1294 | ||
34d52cb6 | 1295 | static int link_free_space(struct btrfs_free_space_ctl *ctl, |
0f9dd46c JB |
1296 | struct btrfs_free_space *info) |
1297 | { | |
1298 | int ret = 0; | |
1299 | ||
96303081 | 1300 | BUG_ON(!info->bitmap && !info->bytes); |
34d52cb6 | 1301 | ret = tree_insert_offset(&ctl->free_space_offset, info->offset, |
96303081 | 1302 | &info->offset_index, (info->bitmap != NULL)); |
0f9dd46c JB |
1303 | if (ret) |
1304 | return ret; | |
1305 | ||
34d52cb6 LZ |
1306 | ctl->free_space += info->bytes; |
1307 | ctl->free_extents++; | |
96303081 JB |
1308 | return ret; |
1309 | } | |
1310 | ||
34d52cb6 | 1311 | static void recalculate_thresholds(struct btrfs_free_space_ctl *ctl) |
96303081 | 1312 | { |
34d52cb6 | 1313 | struct btrfs_block_group_cache *block_group = ctl->private; |
25891f79 JB |
1314 | u64 max_bytes; |
1315 | u64 bitmap_bytes; | |
1316 | u64 extent_bytes; | |
8eb2d829 | 1317 | u64 size = block_group->key.offset; |
34d52cb6 LZ |
1318 | u64 bytes_per_bg = BITS_PER_BITMAP * block_group->sectorsize; |
1319 | int max_bitmaps = div64_u64(size + bytes_per_bg - 1, bytes_per_bg); | |
1320 | ||
1321 | BUG_ON(ctl->total_bitmaps > max_bitmaps); | |
96303081 JB |
1322 | |
1323 | /* | |
1324 | * The goal is to keep the total amount of memory used per 1gb of space | |
1325 | * at or below 32k, so we need to adjust how much memory we allow to be | |
1326 | * used by extent based free space tracking | |
1327 | */ | |
8eb2d829 LZ |
1328 | if (size < 1024 * 1024 * 1024) |
1329 | max_bytes = MAX_CACHE_BYTES_PER_GIG; | |
1330 | else | |
1331 | max_bytes = MAX_CACHE_BYTES_PER_GIG * | |
1332 | div64_u64(size, 1024 * 1024 * 1024); | |
96303081 | 1333 | |
25891f79 JB |
1334 | /* |
1335 | * we want to account for 1 more bitmap than what we have so we can make | |
1336 | * sure we don't go over our overall goal of MAX_CACHE_BYTES_PER_GIG as | |
1337 | * we add more bitmaps. | |
1338 | */ | |
34d52cb6 | 1339 | bitmap_bytes = (ctl->total_bitmaps + 1) * PAGE_CACHE_SIZE; |
96303081 | 1340 | |
25891f79 | 1341 | if (bitmap_bytes >= max_bytes) { |
34d52cb6 | 1342 | ctl->extents_thresh = 0; |
25891f79 JB |
1343 | return; |
1344 | } | |
96303081 | 1345 | |
25891f79 JB |
1346 | /* |
1347 | * we want the extent entry threshold to always be at most 1/2 the maxw | |
1348 | * bytes we can have, or whatever is less than that. | |
1349 | */ | |
1350 | extent_bytes = max_bytes - bitmap_bytes; | |
1351 | extent_bytes = min_t(u64, extent_bytes, div64_u64(max_bytes, 2)); | |
96303081 | 1352 | |
34d52cb6 | 1353 | ctl->extents_thresh = |
25891f79 | 1354 | div64_u64(extent_bytes, (sizeof(struct btrfs_free_space))); |
96303081 JB |
1355 | } |
1356 | ||
bb3ac5a4 MX |
1357 | static inline void __bitmap_clear_bits(struct btrfs_free_space_ctl *ctl, |
1358 | struct btrfs_free_space *info, | |
1359 | u64 offset, u64 bytes) | |
96303081 | 1360 | { |
f38b6e75 | 1361 | unsigned long start, count; |
96303081 | 1362 | |
34d52cb6 LZ |
1363 | start = offset_to_bit(info->offset, ctl->unit, offset); |
1364 | count = bytes_to_bits(bytes, ctl->unit); | |
f38b6e75 | 1365 | BUG_ON(start + count > BITS_PER_BITMAP); |
96303081 | 1366 | |
f38b6e75 | 1367 | bitmap_clear(info->bitmap, start, count); |
96303081 JB |
1368 | |
1369 | info->bytes -= bytes; | |
bb3ac5a4 MX |
1370 | } |
1371 | ||
1372 | static void bitmap_clear_bits(struct btrfs_free_space_ctl *ctl, | |
1373 | struct btrfs_free_space *info, u64 offset, | |
1374 | u64 bytes) | |
1375 | { | |
1376 | __bitmap_clear_bits(ctl, info, offset, bytes); | |
34d52cb6 | 1377 | ctl->free_space -= bytes; |
96303081 JB |
1378 | } |
1379 | ||
34d52cb6 | 1380 | static void bitmap_set_bits(struct btrfs_free_space_ctl *ctl, |
817d52f8 JB |
1381 | struct btrfs_free_space *info, u64 offset, |
1382 | u64 bytes) | |
96303081 | 1383 | { |
f38b6e75 | 1384 | unsigned long start, count; |
96303081 | 1385 | |
34d52cb6 LZ |
1386 | start = offset_to_bit(info->offset, ctl->unit, offset); |
1387 | count = bytes_to_bits(bytes, ctl->unit); | |
f38b6e75 | 1388 | BUG_ON(start + count > BITS_PER_BITMAP); |
96303081 | 1389 | |
f38b6e75 | 1390 | bitmap_set(info->bitmap, start, count); |
96303081 JB |
1391 | |
1392 | info->bytes += bytes; | |
34d52cb6 | 1393 | ctl->free_space += bytes; |
96303081 JB |
1394 | } |
1395 | ||
34d52cb6 | 1396 | static int search_bitmap(struct btrfs_free_space_ctl *ctl, |
96303081 JB |
1397 | struct btrfs_free_space *bitmap_info, u64 *offset, |
1398 | u64 *bytes) | |
1399 | { | |
1400 | unsigned long found_bits = 0; | |
1401 | unsigned long bits, i; | |
1402 | unsigned long next_zero; | |
1403 | ||
34d52cb6 | 1404 | i = offset_to_bit(bitmap_info->offset, ctl->unit, |
96303081 | 1405 | max_t(u64, *offset, bitmap_info->offset)); |
34d52cb6 | 1406 | bits = bytes_to_bits(*bytes, ctl->unit); |
96303081 JB |
1407 | |
1408 | for (i = find_next_bit(bitmap_info->bitmap, BITS_PER_BITMAP, i); | |
1409 | i < BITS_PER_BITMAP; | |
1410 | i = find_next_bit(bitmap_info->bitmap, BITS_PER_BITMAP, i + 1)) { | |
1411 | next_zero = find_next_zero_bit(bitmap_info->bitmap, | |
1412 | BITS_PER_BITMAP, i); | |
1413 | if ((next_zero - i) >= bits) { | |
1414 | found_bits = next_zero - i; | |
1415 | break; | |
1416 | } | |
1417 | i = next_zero; | |
1418 | } | |
1419 | ||
1420 | if (found_bits) { | |
34d52cb6 LZ |
1421 | *offset = (u64)(i * ctl->unit) + bitmap_info->offset; |
1422 | *bytes = (u64)(found_bits) * ctl->unit; | |
96303081 JB |
1423 | return 0; |
1424 | } | |
1425 | ||
1426 | return -1; | |
1427 | } | |
1428 | ||
34d52cb6 LZ |
1429 | static struct btrfs_free_space * |
1430 | find_free_space(struct btrfs_free_space_ctl *ctl, u64 *offset, u64 *bytes) | |
96303081 JB |
1431 | { |
1432 | struct btrfs_free_space *entry; | |
1433 | struct rb_node *node; | |
1434 | int ret; | |
1435 | ||
34d52cb6 | 1436 | if (!ctl->free_space_offset.rb_node) |
96303081 JB |
1437 | return NULL; |
1438 | ||
34d52cb6 | 1439 | entry = tree_search_offset(ctl, offset_to_bitmap(ctl, *offset), 0, 1); |
96303081 JB |
1440 | if (!entry) |
1441 | return NULL; | |
1442 | ||
1443 | for (node = &entry->offset_index; node; node = rb_next(node)) { | |
1444 | entry = rb_entry(node, struct btrfs_free_space, offset_index); | |
1445 | if (entry->bytes < *bytes) | |
1446 | continue; | |
1447 | ||
1448 | if (entry->bitmap) { | |
34d52cb6 | 1449 | ret = search_bitmap(ctl, entry, offset, bytes); |
96303081 JB |
1450 | if (!ret) |
1451 | return entry; | |
1452 | continue; | |
1453 | } | |
1454 | ||
1455 | *offset = entry->offset; | |
1456 | *bytes = entry->bytes; | |
1457 | return entry; | |
1458 | } | |
1459 | ||
1460 | return NULL; | |
1461 | } | |
1462 | ||
34d52cb6 | 1463 | static void add_new_bitmap(struct btrfs_free_space_ctl *ctl, |
96303081 JB |
1464 | struct btrfs_free_space *info, u64 offset) |
1465 | { | |
34d52cb6 | 1466 | info->offset = offset_to_bitmap(ctl, offset); |
f019f426 | 1467 | info->bytes = 0; |
34d52cb6 LZ |
1468 | link_free_space(ctl, info); |
1469 | ctl->total_bitmaps++; | |
96303081 | 1470 | |
34d52cb6 | 1471 | ctl->op->recalc_thresholds(ctl); |
96303081 JB |
1472 | } |
1473 | ||
34d52cb6 | 1474 | static void free_bitmap(struct btrfs_free_space_ctl *ctl, |
edf6e2d1 LZ |
1475 | struct btrfs_free_space *bitmap_info) |
1476 | { | |
34d52cb6 | 1477 | unlink_free_space(ctl, bitmap_info); |
edf6e2d1 | 1478 | kfree(bitmap_info->bitmap); |
dc89e982 | 1479 | kmem_cache_free(btrfs_free_space_cachep, bitmap_info); |
34d52cb6 LZ |
1480 | ctl->total_bitmaps--; |
1481 | ctl->op->recalc_thresholds(ctl); | |
edf6e2d1 LZ |
1482 | } |
1483 | ||
34d52cb6 | 1484 | static noinline int remove_from_bitmap(struct btrfs_free_space_ctl *ctl, |
96303081 JB |
1485 | struct btrfs_free_space *bitmap_info, |
1486 | u64 *offset, u64 *bytes) | |
1487 | { | |
1488 | u64 end; | |
6606bb97 JB |
1489 | u64 search_start, search_bytes; |
1490 | int ret; | |
96303081 JB |
1491 | |
1492 | again: | |
34d52cb6 | 1493 | end = bitmap_info->offset + (u64)(BITS_PER_BITMAP * ctl->unit) - 1; |
96303081 | 1494 | |
6606bb97 JB |
1495 | /* |
1496 | * XXX - this can go away after a few releases. | |
1497 | * | |
1498 | * since the only user of btrfs_remove_free_space is the tree logging | |
1499 | * stuff, and the only way to test that is under crash conditions, we | |
1500 | * want to have this debug stuff here just in case somethings not | |
1501 | * working. Search the bitmap for the space we are trying to use to | |
1502 | * make sure its actually there. If its not there then we need to stop | |
1503 | * because something has gone wrong. | |
1504 | */ | |
1505 | search_start = *offset; | |
1506 | search_bytes = *bytes; | |
13dbc089 | 1507 | search_bytes = min(search_bytes, end - search_start + 1); |
34d52cb6 | 1508 | ret = search_bitmap(ctl, bitmap_info, &search_start, &search_bytes); |
6606bb97 JB |
1509 | BUG_ON(ret < 0 || search_start != *offset); |
1510 | ||
96303081 | 1511 | if (*offset > bitmap_info->offset && *offset + *bytes > end) { |
34d52cb6 | 1512 | bitmap_clear_bits(ctl, bitmap_info, *offset, end - *offset + 1); |
96303081 JB |
1513 | *bytes -= end - *offset + 1; |
1514 | *offset = end + 1; | |
1515 | } else if (*offset >= bitmap_info->offset && *offset + *bytes <= end) { | |
34d52cb6 | 1516 | bitmap_clear_bits(ctl, bitmap_info, *offset, *bytes); |
96303081 JB |
1517 | *bytes = 0; |
1518 | } | |
1519 | ||
1520 | if (*bytes) { | |
6606bb97 | 1521 | struct rb_node *next = rb_next(&bitmap_info->offset_index); |
edf6e2d1 | 1522 | if (!bitmap_info->bytes) |
34d52cb6 | 1523 | free_bitmap(ctl, bitmap_info); |
96303081 | 1524 | |
6606bb97 JB |
1525 | /* |
1526 | * no entry after this bitmap, but we still have bytes to | |
1527 | * remove, so something has gone wrong. | |
1528 | */ | |
1529 | if (!next) | |
96303081 JB |
1530 | return -EINVAL; |
1531 | ||
6606bb97 JB |
1532 | bitmap_info = rb_entry(next, struct btrfs_free_space, |
1533 | offset_index); | |
1534 | ||
1535 | /* | |
1536 | * if the next entry isn't a bitmap we need to return to let the | |
1537 | * extent stuff do its work. | |
1538 | */ | |
96303081 JB |
1539 | if (!bitmap_info->bitmap) |
1540 | return -EAGAIN; | |
1541 | ||
6606bb97 JB |
1542 | /* |
1543 | * Ok the next item is a bitmap, but it may not actually hold | |
1544 | * the information for the rest of this free space stuff, so | |
1545 | * look for it, and if we don't find it return so we can try | |
1546 | * everything over again. | |
1547 | */ | |
1548 | search_start = *offset; | |
1549 | search_bytes = *bytes; | |
34d52cb6 | 1550 | ret = search_bitmap(ctl, bitmap_info, &search_start, |
6606bb97 JB |
1551 | &search_bytes); |
1552 | if (ret < 0 || search_start != *offset) | |
1553 | return -EAGAIN; | |
1554 | ||
96303081 | 1555 | goto again; |
edf6e2d1 | 1556 | } else if (!bitmap_info->bytes) |
34d52cb6 | 1557 | free_bitmap(ctl, bitmap_info); |
96303081 JB |
1558 | |
1559 | return 0; | |
1560 | } | |
1561 | ||
2cdc342c JB |
1562 | static u64 add_bytes_to_bitmap(struct btrfs_free_space_ctl *ctl, |
1563 | struct btrfs_free_space *info, u64 offset, | |
1564 | u64 bytes) | |
1565 | { | |
1566 | u64 bytes_to_set = 0; | |
1567 | u64 end; | |
1568 | ||
1569 | end = info->offset + (u64)(BITS_PER_BITMAP * ctl->unit); | |
1570 | ||
1571 | bytes_to_set = min(end - offset, bytes); | |
1572 | ||
1573 | bitmap_set_bits(ctl, info, offset, bytes_to_set); | |
1574 | ||
1575 | return bytes_to_set; | |
1576 | ||
1577 | } | |
1578 | ||
34d52cb6 LZ |
1579 | static bool use_bitmap(struct btrfs_free_space_ctl *ctl, |
1580 | struct btrfs_free_space *info) | |
96303081 | 1581 | { |
34d52cb6 | 1582 | struct btrfs_block_group_cache *block_group = ctl->private; |
96303081 JB |
1583 | |
1584 | /* | |
1585 | * If we are below the extents threshold then we can add this as an | |
1586 | * extent, and don't have to deal with the bitmap | |
1587 | */ | |
34d52cb6 | 1588 | if (ctl->free_extents < ctl->extents_thresh) { |
32cb0840 JB |
1589 | /* |
1590 | * If this block group has some small extents we don't want to | |
1591 | * use up all of our free slots in the cache with them, we want | |
1592 | * to reserve them to larger extents, however if we have plent | |
1593 | * of cache left then go ahead an dadd them, no sense in adding | |
1594 | * the overhead of a bitmap if we don't have to. | |
1595 | */ | |
1596 | if (info->bytes <= block_group->sectorsize * 4) { | |
34d52cb6 LZ |
1597 | if (ctl->free_extents * 2 <= ctl->extents_thresh) |
1598 | return false; | |
32cb0840 | 1599 | } else { |
34d52cb6 | 1600 | return false; |
32cb0840 JB |
1601 | } |
1602 | } | |
96303081 JB |
1603 | |
1604 | /* | |
1605 | * some block groups are so tiny they can't be enveloped by a bitmap, so | |
1606 | * don't even bother to create a bitmap for this | |
1607 | */ | |
1608 | if (BITS_PER_BITMAP * block_group->sectorsize > | |
1609 | block_group->key.offset) | |
34d52cb6 LZ |
1610 | return false; |
1611 | ||
1612 | return true; | |
1613 | } | |
1614 | ||
2cdc342c JB |
1615 | static struct btrfs_free_space_op free_space_op = { |
1616 | .recalc_thresholds = recalculate_thresholds, | |
1617 | .use_bitmap = use_bitmap, | |
1618 | }; | |
1619 | ||
34d52cb6 LZ |
1620 | static int insert_into_bitmap(struct btrfs_free_space_ctl *ctl, |
1621 | struct btrfs_free_space *info) | |
1622 | { | |
1623 | struct btrfs_free_space *bitmap_info; | |
2cdc342c | 1624 | struct btrfs_block_group_cache *block_group = NULL; |
34d52cb6 | 1625 | int added = 0; |
2cdc342c | 1626 | u64 bytes, offset, bytes_added; |
34d52cb6 | 1627 | int ret; |
96303081 JB |
1628 | |
1629 | bytes = info->bytes; | |
1630 | offset = info->offset; | |
1631 | ||
34d52cb6 LZ |
1632 | if (!ctl->op->use_bitmap(ctl, info)) |
1633 | return 0; | |
1634 | ||
2cdc342c JB |
1635 | if (ctl->op == &free_space_op) |
1636 | block_group = ctl->private; | |
38e87880 | 1637 | again: |
2cdc342c JB |
1638 | /* |
1639 | * Since we link bitmaps right into the cluster we need to see if we | |
1640 | * have a cluster here, and if so and it has our bitmap we need to add | |
1641 | * the free space to that bitmap. | |
1642 | */ | |
1643 | if (block_group && !list_empty(&block_group->cluster_list)) { | |
1644 | struct btrfs_free_cluster *cluster; | |
1645 | struct rb_node *node; | |
1646 | struct btrfs_free_space *entry; | |
1647 | ||
1648 | cluster = list_entry(block_group->cluster_list.next, | |
1649 | struct btrfs_free_cluster, | |
1650 | block_group_list); | |
1651 | spin_lock(&cluster->lock); | |
1652 | node = rb_first(&cluster->root); | |
1653 | if (!node) { | |
1654 | spin_unlock(&cluster->lock); | |
38e87880 | 1655 | goto no_cluster_bitmap; |
2cdc342c JB |
1656 | } |
1657 | ||
1658 | entry = rb_entry(node, struct btrfs_free_space, offset_index); | |
1659 | if (!entry->bitmap) { | |
1660 | spin_unlock(&cluster->lock); | |
38e87880 | 1661 | goto no_cluster_bitmap; |
2cdc342c JB |
1662 | } |
1663 | ||
1664 | if (entry->offset == offset_to_bitmap(ctl, offset)) { | |
1665 | bytes_added = add_bytes_to_bitmap(ctl, entry, | |
1666 | offset, bytes); | |
1667 | bytes -= bytes_added; | |
1668 | offset += bytes_added; | |
1669 | } | |
1670 | spin_unlock(&cluster->lock); | |
1671 | if (!bytes) { | |
1672 | ret = 1; | |
1673 | goto out; | |
1674 | } | |
1675 | } | |
38e87880 CM |
1676 | |
1677 | no_cluster_bitmap: | |
34d52cb6 | 1678 | bitmap_info = tree_search_offset(ctl, offset_to_bitmap(ctl, offset), |
96303081 JB |
1679 | 1, 0); |
1680 | if (!bitmap_info) { | |
1681 | BUG_ON(added); | |
1682 | goto new_bitmap; | |
1683 | } | |
1684 | ||
2cdc342c JB |
1685 | bytes_added = add_bytes_to_bitmap(ctl, bitmap_info, offset, bytes); |
1686 | bytes -= bytes_added; | |
1687 | offset += bytes_added; | |
1688 | added = 0; | |
96303081 JB |
1689 | |
1690 | if (!bytes) { | |
1691 | ret = 1; | |
1692 | goto out; | |
1693 | } else | |
1694 | goto again; | |
1695 | ||
1696 | new_bitmap: | |
1697 | if (info && info->bitmap) { | |
34d52cb6 | 1698 | add_new_bitmap(ctl, info, offset); |
96303081 JB |
1699 | added = 1; |
1700 | info = NULL; | |
1701 | goto again; | |
1702 | } else { | |
34d52cb6 | 1703 | spin_unlock(&ctl->tree_lock); |
96303081 JB |
1704 | |
1705 | /* no pre-allocated info, allocate a new one */ | |
1706 | if (!info) { | |
dc89e982 JB |
1707 | info = kmem_cache_zalloc(btrfs_free_space_cachep, |
1708 | GFP_NOFS); | |
96303081 | 1709 | if (!info) { |
34d52cb6 | 1710 | spin_lock(&ctl->tree_lock); |
96303081 JB |
1711 | ret = -ENOMEM; |
1712 | goto out; | |
1713 | } | |
1714 | } | |
1715 | ||
1716 | /* allocate the bitmap */ | |
1717 | info->bitmap = kzalloc(PAGE_CACHE_SIZE, GFP_NOFS); | |
34d52cb6 | 1718 | spin_lock(&ctl->tree_lock); |
96303081 JB |
1719 | if (!info->bitmap) { |
1720 | ret = -ENOMEM; | |
1721 | goto out; | |
1722 | } | |
1723 | goto again; | |
1724 | } | |
1725 | ||
1726 | out: | |
1727 | if (info) { | |
1728 | if (info->bitmap) | |
1729 | kfree(info->bitmap); | |
dc89e982 | 1730 | kmem_cache_free(btrfs_free_space_cachep, info); |
96303081 | 1731 | } |
0f9dd46c JB |
1732 | |
1733 | return ret; | |
1734 | } | |
1735 | ||
945d8962 | 1736 | static bool try_merge_free_space(struct btrfs_free_space_ctl *ctl, |
f333adb5 | 1737 | struct btrfs_free_space *info, bool update_stat) |
0f9dd46c | 1738 | { |
120d66ee LZ |
1739 | struct btrfs_free_space *left_info; |
1740 | struct btrfs_free_space *right_info; | |
1741 | bool merged = false; | |
1742 | u64 offset = info->offset; | |
1743 | u64 bytes = info->bytes; | |
6226cb0a | 1744 | |
0f9dd46c JB |
1745 | /* |
1746 | * first we want to see if there is free space adjacent to the range we | |
1747 | * are adding, if there is remove that struct and add a new one to | |
1748 | * cover the entire range | |
1749 | */ | |
34d52cb6 | 1750 | right_info = tree_search_offset(ctl, offset + bytes, 0, 0); |
96303081 JB |
1751 | if (right_info && rb_prev(&right_info->offset_index)) |
1752 | left_info = rb_entry(rb_prev(&right_info->offset_index), | |
1753 | struct btrfs_free_space, offset_index); | |
1754 | else | |
34d52cb6 | 1755 | left_info = tree_search_offset(ctl, offset - 1, 0, 0); |
0f9dd46c | 1756 | |
96303081 | 1757 | if (right_info && !right_info->bitmap) { |
f333adb5 | 1758 | if (update_stat) |
34d52cb6 | 1759 | unlink_free_space(ctl, right_info); |
f333adb5 | 1760 | else |
34d52cb6 | 1761 | __unlink_free_space(ctl, right_info); |
6226cb0a | 1762 | info->bytes += right_info->bytes; |
dc89e982 | 1763 | kmem_cache_free(btrfs_free_space_cachep, right_info); |
120d66ee | 1764 | merged = true; |
0f9dd46c JB |
1765 | } |
1766 | ||
96303081 JB |
1767 | if (left_info && !left_info->bitmap && |
1768 | left_info->offset + left_info->bytes == offset) { | |
f333adb5 | 1769 | if (update_stat) |
34d52cb6 | 1770 | unlink_free_space(ctl, left_info); |
f333adb5 | 1771 | else |
34d52cb6 | 1772 | __unlink_free_space(ctl, left_info); |
6226cb0a JB |
1773 | info->offset = left_info->offset; |
1774 | info->bytes += left_info->bytes; | |
dc89e982 | 1775 | kmem_cache_free(btrfs_free_space_cachep, left_info); |
120d66ee | 1776 | merged = true; |
0f9dd46c JB |
1777 | } |
1778 | ||
120d66ee LZ |
1779 | return merged; |
1780 | } | |
1781 | ||
581bb050 LZ |
1782 | int __btrfs_add_free_space(struct btrfs_free_space_ctl *ctl, |
1783 | u64 offset, u64 bytes) | |
120d66ee LZ |
1784 | { |
1785 | struct btrfs_free_space *info; | |
1786 | int ret = 0; | |
1787 | ||
dc89e982 | 1788 | info = kmem_cache_zalloc(btrfs_free_space_cachep, GFP_NOFS); |
120d66ee LZ |
1789 | if (!info) |
1790 | return -ENOMEM; | |
1791 | ||
1792 | info->offset = offset; | |
1793 | info->bytes = bytes; | |
1794 | ||
34d52cb6 | 1795 | spin_lock(&ctl->tree_lock); |
120d66ee | 1796 | |
34d52cb6 | 1797 | if (try_merge_free_space(ctl, info, true)) |
120d66ee LZ |
1798 | goto link; |
1799 | ||
1800 | /* | |
1801 | * There was no extent directly to the left or right of this new | |
1802 | * extent then we know we're going to have to allocate a new extent, so | |
1803 | * before we do that see if we need to drop this into a bitmap | |
1804 | */ | |
34d52cb6 | 1805 | ret = insert_into_bitmap(ctl, info); |
120d66ee LZ |
1806 | if (ret < 0) { |
1807 | goto out; | |
1808 | } else if (ret) { | |
1809 | ret = 0; | |
1810 | goto out; | |
1811 | } | |
1812 | link: | |
34d52cb6 | 1813 | ret = link_free_space(ctl, info); |
0f9dd46c | 1814 | if (ret) |
dc89e982 | 1815 | kmem_cache_free(btrfs_free_space_cachep, info); |
96303081 | 1816 | out: |
34d52cb6 | 1817 | spin_unlock(&ctl->tree_lock); |
6226cb0a | 1818 | |
0f9dd46c | 1819 | if (ret) { |
96303081 | 1820 | printk(KERN_CRIT "btrfs: unable to add free space :%d\n", ret); |
c293498b | 1821 | BUG_ON(ret == -EEXIST); |
0f9dd46c JB |
1822 | } |
1823 | ||
0f9dd46c JB |
1824 | return ret; |
1825 | } | |
1826 | ||
6226cb0a JB |
1827 | int btrfs_remove_free_space(struct btrfs_block_group_cache *block_group, |
1828 | u64 offset, u64 bytes) | |
0f9dd46c | 1829 | { |
34d52cb6 | 1830 | struct btrfs_free_space_ctl *ctl = block_group->free_space_ctl; |
0f9dd46c | 1831 | struct btrfs_free_space *info; |
96303081 | 1832 | struct btrfs_free_space *next_info = NULL; |
0f9dd46c JB |
1833 | int ret = 0; |
1834 | ||
34d52cb6 | 1835 | spin_lock(&ctl->tree_lock); |
6226cb0a | 1836 | |
96303081 | 1837 | again: |
34d52cb6 | 1838 | info = tree_search_offset(ctl, offset, 0, 0); |
96303081 | 1839 | if (!info) { |
6606bb97 JB |
1840 | /* |
1841 | * oops didn't find an extent that matched the space we wanted | |
1842 | * to remove, look for a bitmap instead | |
1843 | */ | |
34d52cb6 | 1844 | info = tree_search_offset(ctl, offset_to_bitmap(ctl, offset), |
6606bb97 JB |
1845 | 1, 0); |
1846 | if (!info) { | |
1847 | WARN_ON(1); | |
1848 | goto out_lock; | |
1849 | } | |
96303081 JB |
1850 | } |
1851 | ||
1852 | if (info->bytes < bytes && rb_next(&info->offset_index)) { | |
1853 | u64 end; | |
1854 | next_info = rb_entry(rb_next(&info->offset_index), | |
1855 | struct btrfs_free_space, | |
1856 | offset_index); | |
1857 | ||
1858 | if (next_info->bitmap) | |
34d52cb6 LZ |
1859 | end = next_info->offset + |
1860 | BITS_PER_BITMAP * ctl->unit - 1; | |
96303081 JB |
1861 | else |
1862 | end = next_info->offset + next_info->bytes; | |
1863 | ||
1864 | if (next_info->bytes < bytes || | |
1865 | next_info->offset > offset || offset > end) { | |
1866 | printk(KERN_CRIT "Found free space at %llu, size %llu," | |
1867 | " trying to use %llu\n", | |
1868 | (unsigned long long)info->offset, | |
1869 | (unsigned long long)info->bytes, | |
1870 | (unsigned long long)bytes); | |
0f9dd46c JB |
1871 | WARN_ON(1); |
1872 | ret = -EINVAL; | |
96303081 | 1873 | goto out_lock; |
0f9dd46c | 1874 | } |
0f9dd46c | 1875 | |
96303081 JB |
1876 | info = next_info; |
1877 | } | |
1878 | ||
1879 | if (info->bytes == bytes) { | |
34d52cb6 | 1880 | unlink_free_space(ctl, info); |
96303081 JB |
1881 | if (info->bitmap) { |
1882 | kfree(info->bitmap); | |
34d52cb6 | 1883 | ctl->total_bitmaps--; |
0f9dd46c | 1884 | } |
dc89e982 | 1885 | kmem_cache_free(btrfs_free_space_cachep, info); |
1eae31e9 | 1886 | ret = 0; |
96303081 JB |
1887 | goto out_lock; |
1888 | } | |
0f9dd46c | 1889 | |
96303081 | 1890 | if (!info->bitmap && info->offset == offset) { |
34d52cb6 | 1891 | unlink_free_space(ctl, info); |
0f9dd46c JB |
1892 | info->offset += bytes; |
1893 | info->bytes -= bytes; | |
1eae31e9 CM |
1894 | ret = link_free_space(ctl, info); |
1895 | WARN_ON(ret); | |
96303081 JB |
1896 | goto out_lock; |
1897 | } | |
0f9dd46c | 1898 | |
96303081 JB |
1899 | if (!info->bitmap && info->offset <= offset && |
1900 | info->offset + info->bytes >= offset + bytes) { | |
9b49c9b9 CM |
1901 | u64 old_start = info->offset; |
1902 | /* | |
1903 | * we're freeing space in the middle of the info, | |
1904 | * this can happen during tree log replay | |
1905 | * | |
1906 | * first unlink the old info and then | |
1907 | * insert it again after the hole we're creating | |
1908 | */ | |
34d52cb6 | 1909 | unlink_free_space(ctl, info); |
9b49c9b9 CM |
1910 | if (offset + bytes < info->offset + info->bytes) { |
1911 | u64 old_end = info->offset + info->bytes; | |
1912 | ||
1913 | info->offset = offset + bytes; | |
1914 | info->bytes = old_end - info->offset; | |
34d52cb6 | 1915 | ret = link_free_space(ctl, info); |
96303081 JB |
1916 | WARN_ON(ret); |
1917 | if (ret) | |
1918 | goto out_lock; | |
9b49c9b9 CM |
1919 | } else { |
1920 | /* the hole we're creating ends at the end | |
1921 | * of the info struct, just free the info | |
1922 | */ | |
dc89e982 | 1923 | kmem_cache_free(btrfs_free_space_cachep, info); |
9b49c9b9 | 1924 | } |
34d52cb6 | 1925 | spin_unlock(&ctl->tree_lock); |
96303081 JB |
1926 | |
1927 | /* step two, insert a new info struct to cover | |
1928 | * anything before the hole | |
9b49c9b9 | 1929 | */ |
6226cb0a JB |
1930 | ret = btrfs_add_free_space(block_group, old_start, |
1931 | offset - old_start); | |
96303081 JB |
1932 | WARN_ON(ret); |
1933 | goto out; | |
0f9dd46c | 1934 | } |
96303081 | 1935 | |
34d52cb6 | 1936 | ret = remove_from_bitmap(ctl, info, &offset, &bytes); |
96303081 JB |
1937 | if (ret == -EAGAIN) |
1938 | goto again; | |
1939 | BUG_ON(ret); | |
1940 | out_lock: | |
34d52cb6 | 1941 | spin_unlock(&ctl->tree_lock); |
0f9dd46c | 1942 | out: |
25179201 JB |
1943 | return ret; |
1944 | } | |
1945 | ||
0f9dd46c JB |
1946 | void btrfs_dump_free_space(struct btrfs_block_group_cache *block_group, |
1947 | u64 bytes) | |
1948 | { | |
34d52cb6 | 1949 | struct btrfs_free_space_ctl *ctl = block_group->free_space_ctl; |
0f9dd46c JB |
1950 | struct btrfs_free_space *info; |
1951 | struct rb_node *n; | |
1952 | int count = 0; | |
1953 | ||
34d52cb6 | 1954 | for (n = rb_first(&ctl->free_space_offset); n; n = rb_next(n)) { |
0f9dd46c JB |
1955 | info = rb_entry(n, struct btrfs_free_space, offset_index); |
1956 | if (info->bytes >= bytes) | |
1957 | count++; | |
96303081 | 1958 | printk(KERN_CRIT "entry offset %llu, bytes %llu, bitmap %s\n", |
21380931 | 1959 | (unsigned long long)info->offset, |
96303081 JB |
1960 | (unsigned long long)info->bytes, |
1961 | (info->bitmap) ? "yes" : "no"); | |
0f9dd46c | 1962 | } |
96303081 JB |
1963 | printk(KERN_INFO "block group has cluster?: %s\n", |
1964 | list_empty(&block_group->cluster_list) ? "no" : "yes"); | |
0f9dd46c JB |
1965 | printk(KERN_INFO "%d blocks of free space at or bigger than bytes is" |
1966 | "\n", count); | |
1967 | } | |
1968 | ||
34d52cb6 | 1969 | void btrfs_init_free_space_ctl(struct btrfs_block_group_cache *block_group) |
0f9dd46c | 1970 | { |
34d52cb6 | 1971 | struct btrfs_free_space_ctl *ctl = block_group->free_space_ctl; |
0f9dd46c | 1972 | |
34d52cb6 LZ |
1973 | spin_lock_init(&ctl->tree_lock); |
1974 | ctl->unit = block_group->sectorsize; | |
1975 | ctl->start = block_group->key.objectid; | |
1976 | ctl->private = block_group; | |
1977 | ctl->op = &free_space_op; | |
0f9dd46c | 1978 | |
34d52cb6 LZ |
1979 | /* |
1980 | * we only want to have 32k of ram per block group for keeping | |
1981 | * track of free space, and if we pass 1/2 of that we want to | |
1982 | * start converting things over to using bitmaps | |
1983 | */ | |
1984 | ctl->extents_thresh = ((1024 * 32) / 2) / | |
1985 | sizeof(struct btrfs_free_space); | |
0f9dd46c JB |
1986 | } |
1987 | ||
fa9c0d79 CM |
1988 | /* |
1989 | * for a given cluster, put all of its extents back into the free | |
1990 | * space cache. If the block group passed doesn't match the block group | |
1991 | * pointed to by the cluster, someone else raced in and freed the | |
1992 | * cluster already. In that case, we just return without changing anything | |
1993 | */ | |
1994 | static int | |
1995 | __btrfs_return_cluster_to_free_space( | |
1996 | struct btrfs_block_group_cache *block_group, | |
1997 | struct btrfs_free_cluster *cluster) | |
1998 | { | |
34d52cb6 | 1999 | struct btrfs_free_space_ctl *ctl = block_group->free_space_ctl; |
fa9c0d79 CM |
2000 | struct btrfs_free_space *entry; |
2001 | struct rb_node *node; | |
2002 | ||
2003 | spin_lock(&cluster->lock); | |
2004 | if (cluster->block_group != block_group) | |
2005 | goto out; | |
2006 | ||
96303081 | 2007 | cluster->block_group = NULL; |
fa9c0d79 | 2008 | cluster->window_start = 0; |
96303081 | 2009 | list_del_init(&cluster->block_group_list); |
96303081 | 2010 | |
fa9c0d79 | 2011 | node = rb_first(&cluster->root); |
96303081 | 2012 | while (node) { |
4e69b598 JB |
2013 | bool bitmap; |
2014 | ||
fa9c0d79 CM |
2015 | entry = rb_entry(node, struct btrfs_free_space, offset_index); |
2016 | node = rb_next(&entry->offset_index); | |
2017 | rb_erase(&entry->offset_index, &cluster->root); | |
4e69b598 JB |
2018 | |
2019 | bitmap = (entry->bitmap != NULL); | |
2020 | if (!bitmap) | |
34d52cb6 LZ |
2021 | try_merge_free_space(ctl, entry, false); |
2022 | tree_insert_offset(&ctl->free_space_offset, | |
4e69b598 | 2023 | entry->offset, &entry->offset_index, bitmap); |
fa9c0d79 | 2024 | } |
6bef4d31 | 2025 | cluster->root = RB_ROOT; |
96303081 | 2026 | |
fa9c0d79 CM |
2027 | out: |
2028 | spin_unlock(&cluster->lock); | |
96303081 | 2029 | btrfs_put_block_group(block_group); |
fa9c0d79 CM |
2030 | return 0; |
2031 | } | |
2032 | ||
09655373 | 2033 | void __btrfs_remove_free_space_cache_locked(struct btrfs_free_space_ctl *ctl) |
0f9dd46c JB |
2034 | { |
2035 | struct btrfs_free_space *info; | |
2036 | struct rb_node *node; | |
581bb050 | 2037 | |
581bb050 LZ |
2038 | while ((node = rb_last(&ctl->free_space_offset)) != NULL) { |
2039 | info = rb_entry(node, struct btrfs_free_space, offset_index); | |
9b90f513 JB |
2040 | if (!info->bitmap) { |
2041 | unlink_free_space(ctl, info); | |
2042 | kmem_cache_free(btrfs_free_space_cachep, info); | |
2043 | } else { | |
2044 | free_bitmap(ctl, info); | |
2045 | } | |
581bb050 LZ |
2046 | if (need_resched()) { |
2047 | spin_unlock(&ctl->tree_lock); | |
2048 | cond_resched(); | |
2049 | spin_lock(&ctl->tree_lock); | |
2050 | } | |
2051 | } | |
09655373 CM |
2052 | } |
2053 | ||
2054 | void __btrfs_remove_free_space_cache(struct btrfs_free_space_ctl *ctl) | |
2055 | { | |
2056 | spin_lock(&ctl->tree_lock); | |
2057 | __btrfs_remove_free_space_cache_locked(ctl); | |
581bb050 LZ |
2058 | spin_unlock(&ctl->tree_lock); |
2059 | } | |
2060 | ||
2061 | void btrfs_remove_free_space_cache(struct btrfs_block_group_cache *block_group) | |
2062 | { | |
2063 | struct btrfs_free_space_ctl *ctl = block_group->free_space_ctl; | |
fa9c0d79 | 2064 | struct btrfs_free_cluster *cluster; |
96303081 | 2065 | struct list_head *head; |
0f9dd46c | 2066 | |
34d52cb6 | 2067 | spin_lock(&ctl->tree_lock); |
96303081 JB |
2068 | while ((head = block_group->cluster_list.next) != |
2069 | &block_group->cluster_list) { | |
2070 | cluster = list_entry(head, struct btrfs_free_cluster, | |
2071 | block_group_list); | |
fa9c0d79 CM |
2072 | |
2073 | WARN_ON(cluster->block_group != block_group); | |
2074 | __btrfs_return_cluster_to_free_space(block_group, cluster); | |
96303081 | 2075 | if (need_resched()) { |
34d52cb6 | 2076 | spin_unlock(&ctl->tree_lock); |
96303081 | 2077 | cond_resched(); |
34d52cb6 | 2078 | spin_lock(&ctl->tree_lock); |
96303081 | 2079 | } |
fa9c0d79 | 2080 | } |
09655373 | 2081 | __btrfs_remove_free_space_cache_locked(ctl); |
34d52cb6 | 2082 | spin_unlock(&ctl->tree_lock); |
fa9c0d79 | 2083 | |
0f9dd46c JB |
2084 | } |
2085 | ||
6226cb0a JB |
2086 | u64 btrfs_find_space_for_alloc(struct btrfs_block_group_cache *block_group, |
2087 | u64 offset, u64 bytes, u64 empty_size) | |
0f9dd46c | 2088 | { |
34d52cb6 | 2089 | struct btrfs_free_space_ctl *ctl = block_group->free_space_ctl; |
6226cb0a | 2090 | struct btrfs_free_space *entry = NULL; |
96303081 | 2091 | u64 bytes_search = bytes + empty_size; |
6226cb0a | 2092 | u64 ret = 0; |
0f9dd46c | 2093 | |
34d52cb6 LZ |
2094 | spin_lock(&ctl->tree_lock); |
2095 | entry = find_free_space(ctl, &offset, &bytes_search); | |
6226cb0a | 2096 | if (!entry) |
96303081 JB |
2097 | goto out; |
2098 | ||
2099 | ret = offset; | |
2100 | if (entry->bitmap) { | |
34d52cb6 | 2101 | bitmap_clear_bits(ctl, entry, offset, bytes); |
edf6e2d1 | 2102 | if (!entry->bytes) |
34d52cb6 | 2103 | free_bitmap(ctl, entry); |
96303081 | 2104 | } else { |
34d52cb6 | 2105 | unlink_free_space(ctl, entry); |
6226cb0a JB |
2106 | entry->offset += bytes; |
2107 | entry->bytes -= bytes; | |
6226cb0a | 2108 | if (!entry->bytes) |
dc89e982 | 2109 | kmem_cache_free(btrfs_free_space_cachep, entry); |
6226cb0a | 2110 | else |
34d52cb6 | 2111 | link_free_space(ctl, entry); |
6226cb0a | 2112 | } |
0f9dd46c | 2113 | |
96303081 | 2114 | out: |
34d52cb6 | 2115 | spin_unlock(&ctl->tree_lock); |
817d52f8 | 2116 | |
0f9dd46c JB |
2117 | return ret; |
2118 | } | |
fa9c0d79 CM |
2119 | |
2120 | /* | |
2121 | * given a cluster, put all of its extents back into the free space | |
2122 | * cache. If a block group is passed, this function will only free | |
2123 | * a cluster that belongs to the passed block group. | |
2124 | * | |
2125 | * Otherwise, it'll get a reference on the block group pointed to by the | |
2126 | * cluster and remove the cluster from it. | |
2127 | */ | |
2128 | int btrfs_return_cluster_to_free_space( | |
2129 | struct btrfs_block_group_cache *block_group, | |
2130 | struct btrfs_free_cluster *cluster) | |
2131 | { | |
34d52cb6 | 2132 | struct btrfs_free_space_ctl *ctl; |
fa9c0d79 CM |
2133 | int ret; |
2134 | ||
2135 | /* first, get a safe pointer to the block group */ | |
2136 | spin_lock(&cluster->lock); | |
2137 | if (!block_group) { | |
2138 | block_group = cluster->block_group; | |
2139 | if (!block_group) { | |
2140 | spin_unlock(&cluster->lock); | |
2141 | return 0; | |
2142 | } | |
2143 | } else if (cluster->block_group != block_group) { | |
2144 | /* someone else has already freed it don't redo their work */ | |
2145 | spin_unlock(&cluster->lock); | |
2146 | return 0; | |
2147 | } | |
2148 | atomic_inc(&block_group->count); | |
2149 | spin_unlock(&cluster->lock); | |
2150 | ||
34d52cb6 LZ |
2151 | ctl = block_group->free_space_ctl; |
2152 | ||
fa9c0d79 | 2153 | /* now return any extents the cluster had on it */ |
34d52cb6 | 2154 | spin_lock(&ctl->tree_lock); |
fa9c0d79 | 2155 | ret = __btrfs_return_cluster_to_free_space(block_group, cluster); |
34d52cb6 | 2156 | spin_unlock(&ctl->tree_lock); |
fa9c0d79 CM |
2157 | |
2158 | /* finally drop our ref */ | |
2159 | btrfs_put_block_group(block_group); | |
2160 | return ret; | |
2161 | } | |
2162 | ||
96303081 JB |
2163 | static u64 btrfs_alloc_from_bitmap(struct btrfs_block_group_cache *block_group, |
2164 | struct btrfs_free_cluster *cluster, | |
4e69b598 | 2165 | struct btrfs_free_space *entry, |
96303081 JB |
2166 | u64 bytes, u64 min_start) |
2167 | { | |
34d52cb6 | 2168 | struct btrfs_free_space_ctl *ctl = block_group->free_space_ctl; |
96303081 JB |
2169 | int err; |
2170 | u64 search_start = cluster->window_start; | |
2171 | u64 search_bytes = bytes; | |
2172 | u64 ret = 0; | |
2173 | ||
96303081 JB |
2174 | search_start = min_start; |
2175 | search_bytes = bytes; | |
2176 | ||
34d52cb6 | 2177 | err = search_bitmap(ctl, entry, &search_start, &search_bytes); |
96303081 | 2178 | if (err) |
4e69b598 | 2179 | return 0; |
96303081 JB |
2180 | |
2181 | ret = search_start; | |
bb3ac5a4 | 2182 | __bitmap_clear_bits(ctl, entry, ret, bytes); |
96303081 JB |
2183 | |
2184 | return ret; | |
2185 | } | |
2186 | ||
fa9c0d79 CM |
2187 | /* |
2188 | * given a cluster, try to allocate 'bytes' from it, returns 0 | |
2189 | * if it couldn't find anything suitably large, or a logical disk offset | |
2190 | * if things worked out | |
2191 | */ | |
2192 | u64 btrfs_alloc_from_cluster(struct btrfs_block_group_cache *block_group, | |
2193 | struct btrfs_free_cluster *cluster, u64 bytes, | |
2194 | u64 min_start) | |
2195 | { | |
34d52cb6 | 2196 | struct btrfs_free_space_ctl *ctl = block_group->free_space_ctl; |
fa9c0d79 CM |
2197 | struct btrfs_free_space *entry = NULL; |
2198 | struct rb_node *node; | |
2199 | u64 ret = 0; | |
2200 | ||
2201 | spin_lock(&cluster->lock); | |
2202 | if (bytes > cluster->max_size) | |
2203 | goto out; | |
2204 | ||
2205 | if (cluster->block_group != block_group) | |
2206 | goto out; | |
2207 | ||
2208 | node = rb_first(&cluster->root); | |
2209 | if (!node) | |
2210 | goto out; | |
2211 | ||
2212 | entry = rb_entry(node, struct btrfs_free_space, offset_index); | |
fa9c0d79 | 2213 | while(1) { |
4e69b598 JB |
2214 | if (entry->bytes < bytes || |
2215 | (!entry->bitmap && entry->offset < min_start)) { | |
fa9c0d79 CM |
2216 | node = rb_next(&entry->offset_index); |
2217 | if (!node) | |
2218 | break; | |
2219 | entry = rb_entry(node, struct btrfs_free_space, | |
2220 | offset_index); | |
2221 | continue; | |
2222 | } | |
fa9c0d79 | 2223 | |
4e69b598 JB |
2224 | if (entry->bitmap) { |
2225 | ret = btrfs_alloc_from_bitmap(block_group, | |
2226 | cluster, entry, bytes, | |
2227 | min_start); | |
2228 | if (ret == 0) { | |
4e69b598 JB |
2229 | node = rb_next(&entry->offset_index); |
2230 | if (!node) | |
2231 | break; | |
2232 | entry = rb_entry(node, struct btrfs_free_space, | |
2233 | offset_index); | |
2234 | continue; | |
2235 | } | |
2236 | } else { | |
4e69b598 JB |
2237 | ret = entry->offset; |
2238 | ||
2239 | entry->offset += bytes; | |
2240 | entry->bytes -= bytes; | |
2241 | } | |
fa9c0d79 | 2242 | |
5e71b5d5 | 2243 | if (entry->bytes == 0) |
fa9c0d79 | 2244 | rb_erase(&entry->offset_index, &cluster->root); |
fa9c0d79 CM |
2245 | break; |
2246 | } | |
2247 | out: | |
2248 | spin_unlock(&cluster->lock); | |
96303081 | 2249 | |
5e71b5d5 LZ |
2250 | if (!ret) |
2251 | return 0; | |
2252 | ||
34d52cb6 | 2253 | spin_lock(&ctl->tree_lock); |
5e71b5d5 | 2254 | |
34d52cb6 | 2255 | ctl->free_space -= bytes; |
5e71b5d5 | 2256 | if (entry->bytes == 0) { |
34d52cb6 | 2257 | ctl->free_extents--; |
4e69b598 JB |
2258 | if (entry->bitmap) { |
2259 | kfree(entry->bitmap); | |
34d52cb6 LZ |
2260 | ctl->total_bitmaps--; |
2261 | ctl->op->recalc_thresholds(ctl); | |
4e69b598 | 2262 | } |
dc89e982 | 2263 | kmem_cache_free(btrfs_free_space_cachep, entry); |
5e71b5d5 LZ |
2264 | } |
2265 | ||
34d52cb6 | 2266 | spin_unlock(&ctl->tree_lock); |
5e71b5d5 | 2267 | |
fa9c0d79 CM |
2268 | return ret; |
2269 | } | |
2270 | ||
96303081 JB |
2271 | static int btrfs_bitmap_cluster(struct btrfs_block_group_cache *block_group, |
2272 | struct btrfs_free_space *entry, | |
2273 | struct btrfs_free_cluster *cluster, | |
2274 | u64 offset, u64 bytes, u64 min_bytes) | |
2275 | { | |
34d52cb6 | 2276 | struct btrfs_free_space_ctl *ctl = block_group->free_space_ctl; |
96303081 JB |
2277 | unsigned long next_zero; |
2278 | unsigned long i; | |
2279 | unsigned long search_bits; | |
2280 | unsigned long total_bits; | |
2281 | unsigned long found_bits; | |
2282 | unsigned long start = 0; | |
2283 | unsigned long total_found = 0; | |
4e69b598 | 2284 | int ret; |
96303081 JB |
2285 | bool found = false; |
2286 | ||
2287 | i = offset_to_bit(entry->offset, block_group->sectorsize, | |
2288 | max_t(u64, offset, entry->offset)); | |
d0a365e8 JB |
2289 | search_bits = bytes_to_bits(bytes, block_group->sectorsize); |
2290 | total_bits = bytes_to_bits(min_bytes, block_group->sectorsize); | |
96303081 JB |
2291 | |
2292 | again: | |
2293 | found_bits = 0; | |
2294 | for (i = find_next_bit(entry->bitmap, BITS_PER_BITMAP, i); | |
2295 | i < BITS_PER_BITMAP; | |
2296 | i = find_next_bit(entry->bitmap, BITS_PER_BITMAP, i + 1)) { | |
2297 | next_zero = find_next_zero_bit(entry->bitmap, | |
2298 | BITS_PER_BITMAP, i); | |
2299 | if (next_zero - i >= search_bits) { | |
2300 | found_bits = next_zero - i; | |
2301 | break; | |
2302 | } | |
2303 | i = next_zero; | |
2304 | } | |
2305 | ||
2306 | if (!found_bits) | |
4e69b598 | 2307 | return -ENOSPC; |
96303081 JB |
2308 | |
2309 | if (!found) { | |
2310 | start = i; | |
2311 | found = true; | |
2312 | } | |
2313 | ||
2314 | total_found += found_bits; | |
2315 | ||
2316 | if (cluster->max_size < found_bits * block_group->sectorsize) | |
2317 | cluster->max_size = found_bits * block_group->sectorsize; | |
2318 | ||
2319 | if (total_found < total_bits) { | |
2320 | i = find_next_bit(entry->bitmap, BITS_PER_BITMAP, next_zero); | |
2321 | if (i - start > total_bits * 2) { | |
2322 | total_found = 0; | |
2323 | cluster->max_size = 0; | |
2324 | found = false; | |
2325 | } | |
2326 | goto again; | |
2327 | } | |
2328 | ||
2329 | cluster->window_start = start * block_group->sectorsize + | |
2330 | entry->offset; | |
34d52cb6 | 2331 | rb_erase(&entry->offset_index, &ctl->free_space_offset); |
4e69b598 JB |
2332 | ret = tree_insert_offset(&cluster->root, entry->offset, |
2333 | &entry->offset_index, 1); | |
2334 | BUG_ON(ret); | |
96303081 JB |
2335 | |
2336 | return 0; | |
2337 | } | |
2338 | ||
4e69b598 JB |
2339 | /* |
2340 | * This searches the block group for just extents to fill the cluster with. | |
2341 | */ | |
3de85bb9 JB |
2342 | static noinline int |
2343 | setup_cluster_no_bitmap(struct btrfs_block_group_cache *block_group, | |
2344 | struct btrfs_free_cluster *cluster, | |
2345 | struct list_head *bitmaps, u64 offset, u64 bytes, | |
2346 | u64 min_bytes) | |
4e69b598 | 2347 | { |
34d52cb6 | 2348 | struct btrfs_free_space_ctl *ctl = block_group->free_space_ctl; |
4e69b598 JB |
2349 | struct btrfs_free_space *first = NULL; |
2350 | struct btrfs_free_space *entry = NULL; | |
2351 | struct btrfs_free_space *prev = NULL; | |
2352 | struct btrfs_free_space *last; | |
2353 | struct rb_node *node; | |
2354 | u64 window_start; | |
2355 | u64 window_free; | |
2356 | u64 max_extent; | |
2357 | u64 max_gap = 128 * 1024; | |
2358 | ||
34d52cb6 | 2359 | entry = tree_search_offset(ctl, offset, 0, 1); |
4e69b598 JB |
2360 | if (!entry) |
2361 | return -ENOSPC; | |
2362 | ||
2363 | /* | |
2364 | * We don't want bitmaps, so just move along until we find a normal | |
2365 | * extent entry. | |
2366 | */ | |
2367 | while (entry->bitmap) { | |
86d4a77b JB |
2368 | if (list_empty(&entry->list)) |
2369 | list_add_tail(&entry->list, bitmaps); | |
4e69b598 JB |
2370 | node = rb_next(&entry->offset_index); |
2371 | if (!node) | |
2372 | return -ENOSPC; | |
2373 | entry = rb_entry(node, struct btrfs_free_space, offset_index); | |
2374 | } | |
2375 | ||
2376 | window_start = entry->offset; | |
2377 | window_free = entry->bytes; | |
2378 | max_extent = entry->bytes; | |
2379 | first = entry; | |
2380 | last = entry; | |
2381 | prev = entry; | |
2382 | ||
2383 | while (window_free <= min_bytes) { | |
2384 | node = rb_next(&entry->offset_index); | |
2385 | if (!node) | |
2386 | return -ENOSPC; | |
2387 | entry = rb_entry(node, struct btrfs_free_space, offset_index); | |
2388 | ||
86d4a77b JB |
2389 | if (entry->bitmap) { |
2390 | if (list_empty(&entry->list)) | |
2391 | list_add_tail(&entry->list, bitmaps); | |
4e69b598 | 2392 | continue; |
86d4a77b JB |
2393 | } |
2394 | ||
4e69b598 JB |
2395 | /* |
2396 | * we haven't filled the empty size and the window is | |
2397 | * very large. reset and try again | |
2398 | */ | |
2399 | if (entry->offset - (prev->offset + prev->bytes) > max_gap || | |
2400 | entry->offset - window_start > (min_bytes * 2)) { | |
2401 | first = entry; | |
2402 | window_start = entry->offset; | |
2403 | window_free = entry->bytes; | |
2404 | last = entry; | |
2405 | max_extent = entry->bytes; | |
2406 | } else { | |
2407 | last = entry; | |
2408 | window_free += entry->bytes; | |
2409 | if (entry->bytes > max_extent) | |
2410 | max_extent = entry->bytes; | |
2411 | } | |
2412 | prev = entry; | |
2413 | } | |
2414 | ||
2415 | cluster->window_start = first->offset; | |
2416 | ||
2417 | node = &first->offset_index; | |
2418 | ||
2419 | /* | |
2420 | * now we've found our entries, pull them out of the free space | |
2421 | * cache and put them into the cluster rbtree | |
2422 | */ | |
2423 | do { | |
2424 | int ret; | |
2425 | ||
2426 | entry = rb_entry(node, struct btrfs_free_space, offset_index); | |
2427 | node = rb_next(&entry->offset_index); | |
2428 | if (entry->bitmap) | |
2429 | continue; | |
2430 | ||
34d52cb6 | 2431 | rb_erase(&entry->offset_index, &ctl->free_space_offset); |
4e69b598 JB |
2432 | ret = tree_insert_offset(&cluster->root, entry->offset, |
2433 | &entry->offset_index, 0); | |
2434 | BUG_ON(ret); | |
2435 | } while (node && entry != last); | |
2436 | ||
2437 | cluster->max_size = max_extent; | |
2438 | ||
2439 | return 0; | |
2440 | } | |
2441 | ||
2442 | /* | |
2443 | * This specifically looks for bitmaps that may work in the cluster, we assume | |
2444 | * that we have already failed to find extents that will work. | |
2445 | */ | |
3de85bb9 JB |
2446 | static noinline int |
2447 | setup_cluster_bitmap(struct btrfs_block_group_cache *block_group, | |
2448 | struct btrfs_free_cluster *cluster, | |
2449 | struct list_head *bitmaps, u64 offset, u64 bytes, | |
2450 | u64 min_bytes) | |
4e69b598 | 2451 | { |
34d52cb6 | 2452 | struct btrfs_free_space_ctl *ctl = block_group->free_space_ctl; |
4e69b598 JB |
2453 | struct btrfs_free_space *entry; |
2454 | struct rb_node *node; | |
2455 | int ret = -ENOSPC; | |
2456 | ||
34d52cb6 | 2457 | if (ctl->total_bitmaps == 0) |
4e69b598 JB |
2458 | return -ENOSPC; |
2459 | ||
86d4a77b JB |
2460 | /* |
2461 | * First check our cached list of bitmaps and see if there is an entry | |
2462 | * here that will work. | |
2463 | */ | |
2464 | list_for_each_entry(entry, bitmaps, list) { | |
2465 | if (entry->bytes < min_bytes) | |
2466 | continue; | |
2467 | ret = btrfs_bitmap_cluster(block_group, entry, cluster, offset, | |
2468 | bytes, min_bytes); | |
2469 | if (!ret) | |
2470 | return 0; | |
2471 | } | |
2472 | ||
2473 | /* | |
2474 | * If we do have entries on our list and we are here then we didn't find | |
2475 | * anything, so go ahead and get the next entry after the last entry in | |
2476 | * this list and start the search from there. | |
2477 | */ | |
2478 | if (!list_empty(bitmaps)) { | |
2479 | entry = list_entry(bitmaps->prev, struct btrfs_free_space, | |
2480 | list); | |
2481 | node = rb_next(&entry->offset_index); | |
2482 | if (!node) | |
2483 | return -ENOSPC; | |
2484 | entry = rb_entry(node, struct btrfs_free_space, offset_index); | |
2485 | goto search; | |
2486 | } | |
2487 | ||
34d52cb6 | 2488 | entry = tree_search_offset(ctl, offset_to_bitmap(ctl, offset), 0, 1); |
4e69b598 JB |
2489 | if (!entry) |
2490 | return -ENOSPC; | |
2491 | ||
86d4a77b | 2492 | search: |
4e69b598 JB |
2493 | node = &entry->offset_index; |
2494 | do { | |
2495 | entry = rb_entry(node, struct btrfs_free_space, offset_index); | |
2496 | node = rb_next(&entry->offset_index); | |
2497 | if (!entry->bitmap) | |
2498 | continue; | |
2499 | if (entry->bytes < min_bytes) | |
2500 | continue; | |
2501 | ret = btrfs_bitmap_cluster(block_group, entry, cluster, offset, | |
2502 | bytes, min_bytes); | |
2503 | } while (ret && node); | |
2504 | ||
2505 | return ret; | |
2506 | } | |
2507 | ||
fa9c0d79 CM |
2508 | /* |
2509 | * here we try to find a cluster of blocks in a block group. The goal | |
2510 | * is to find at least bytes free and up to empty_size + bytes free. | |
2511 | * We might not find them all in one contiguous area. | |
2512 | * | |
2513 | * returns zero and sets up cluster if things worked out, otherwise | |
2514 | * it returns -enospc | |
2515 | */ | |
2516 | int btrfs_find_space_cluster(struct btrfs_trans_handle *trans, | |
451d7585 | 2517 | struct btrfs_root *root, |
fa9c0d79 CM |
2518 | struct btrfs_block_group_cache *block_group, |
2519 | struct btrfs_free_cluster *cluster, | |
2520 | u64 offset, u64 bytes, u64 empty_size) | |
2521 | { | |
34d52cb6 | 2522 | struct btrfs_free_space_ctl *ctl = block_group->free_space_ctl; |
86d4a77b JB |
2523 | struct list_head bitmaps; |
2524 | struct btrfs_free_space *entry, *tmp; | |
fa9c0d79 | 2525 | u64 min_bytes; |
fa9c0d79 CM |
2526 | int ret; |
2527 | ||
2528 | /* for metadata, allow allocates with more holes */ | |
451d7585 CM |
2529 | if (btrfs_test_opt(root, SSD_SPREAD)) { |
2530 | min_bytes = bytes + empty_size; | |
2531 | } else if (block_group->flags & BTRFS_BLOCK_GROUP_METADATA) { | |
fa9c0d79 CM |
2532 | /* |
2533 | * we want to do larger allocations when we are | |
2534 | * flushing out the delayed refs, it helps prevent | |
2535 | * making more work as we go along. | |
2536 | */ | |
2537 | if (trans->transaction->delayed_refs.flushing) | |
2538 | min_bytes = max(bytes, (bytes + empty_size) >> 1); | |
2539 | else | |
2540 | min_bytes = max(bytes, (bytes + empty_size) >> 4); | |
2541 | } else | |
2542 | min_bytes = max(bytes, (bytes + empty_size) >> 2); | |
2543 | ||
34d52cb6 | 2544 | spin_lock(&ctl->tree_lock); |
7d0d2e8e JB |
2545 | |
2546 | /* | |
2547 | * If we know we don't have enough space to make a cluster don't even | |
2548 | * bother doing all the work to try and find one. | |
2549 | */ | |
34d52cb6 LZ |
2550 | if (ctl->free_space < min_bytes) { |
2551 | spin_unlock(&ctl->tree_lock); | |
7d0d2e8e JB |
2552 | return -ENOSPC; |
2553 | } | |
2554 | ||
fa9c0d79 CM |
2555 | spin_lock(&cluster->lock); |
2556 | ||
2557 | /* someone already found a cluster, hooray */ | |
2558 | if (cluster->block_group) { | |
2559 | ret = 0; | |
2560 | goto out; | |
2561 | } | |
fa9c0d79 | 2562 | |
86d4a77b JB |
2563 | INIT_LIST_HEAD(&bitmaps); |
2564 | ret = setup_cluster_no_bitmap(block_group, cluster, &bitmaps, offset, | |
2565 | bytes, min_bytes); | |
4e69b598 | 2566 | if (ret) |
86d4a77b JB |
2567 | ret = setup_cluster_bitmap(block_group, cluster, &bitmaps, |
2568 | offset, bytes, min_bytes); | |
2569 | ||
2570 | /* Clear our temporary list */ | |
2571 | list_for_each_entry_safe(entry, tmp, &bitmaps, list) | |
2572 | list_del_init(&entry->list); | |
fa9c0d79 | 2573 | |
4e69b598 JB |
2574 | if (!ret) { |
2575 | atomic_inc(&block_group->count); | |
2576 | list_add_tail(&cluster->block_group_list, | |
2577 | &block_group->cluster_list); | |
2578 | cluster->block_group = block_group; | |
fa9c0d79 | 2579 | } |
fa9c0d79 CM |
2580 | out: |
2581 | spin_unlock(&cluster->lock); | |
34d52cb6 | 2582 | spin_unlock(&ctl->tree_lock); |
fa9c0d79 CM |
2583 | |
2584 | return ret; | |
2585 | } | |
2586 | ||
2587 | /* | |
2588 | * simple code to zero out a cluster | |
2589 | */ | |
2590 | void btrfs_init_free_cluster(struct btrfs_free_cluster *cluster) | |
2591 | { | |
2592 | spin_lock_init(&cluster->lock); | |
2593 | spin_lock_init(&cluster->refill_lock); | |
6bef4d31 | 2594 | cluster->root = RB_ROOT; |
fa9c0d79 CM |
2595 | cluster->max_size = 0; |
2596 | INIT_LIST_HEAD(&cluster->block_group_list); | |
2597 | cluster->block_group = NULL; | |
2598 | } | |
2599 | ||
f7039b1d LD |
2600 | int btrfs_trim_block_group(struct btrfs_block_group_cache *block_group, |
2601 | u64 *trimmed, u64 start, u64 end, u64 minlen) | |
2602 | { | |
34d52cb6 | 2603 | struct btrfs_free_space_ctl *ctl = block_group->free_space_ctl; |
f7039b1d LD |
2604 | struct btrfs_free_space *entry = NULL; |
2605 | struct btrfs_fs_info *fs_info = block_group->fs_info; | |
2606 | u64 bytes = 0; | |
2607 | u64 actually_trimmed; | |
2608 | int ret = 0; | |
2609 | ||
2610 | *trimmed = 0; | |
2611 | ||
2612 | while (start < end) { | |
34d52cb6 | 2613 | spin_lock(&ctl->tree_lock); |
f7039b1d | 2614 | |
34d52cb6 LZ |
2615 | if (ctl->free_space < minlen) { |
2616 | spin_unlock(&ctl->tree_lock); | |
f7039b1d LD |
2617 | break; |
2618 | } | |
2619 | ||
34d52cb6 | 2620 | entry = tree_search_offset(ctl, start, 0, 1); |
f7039b1d | 2621 | if (!entry) |
34d52cb6 LZ |
2622 | entry = tree_search_offset(ctl, |
2623 | offset_to_bitmap(ctl, start), | |
f7039b1d LD |
2624 | 1, 1); |
2625 | ||
2626 | if (!entry || entry->offset >= end) { | |
34d52cb6 | 2627 | spin_unlock(&ctl->tree_lock); |
f7039b1d LD |
2628 | break; |
2629 | } | |
2630 | ||
2631 | if (entry->bitmap) { | |
34d52cb6 | 2632 | ret = search_bitmap(ctl, entry, &start, &bytes); |
f7039b1d LD |
2633 | if (!ret) { |
2634 | if (start >= end) { | |
34d52cb6 | 2635 | spin_unlock(&ctl->tree_lock); |
f7039b1d LD |
2636 | break; |
2637 | } | |
2638 | bytes = min(bytes, end - start); | |
34d52cb6 | 2639 | bitmap_clear_bits(ctl, entry, start, bytes); |
f7039b1d | 2640 | if (entry->bytes == 0) |
34d52cb6 | 2641 | free_bitmap(ctl, entry); |
f7039b1d LD |
2642 | } else { |
2643 | start = entry->offset + BITS_PER_BITMAP * | |
2644 | block_group->sectorsize; | |
34d52cb6 | 2645 | spin_unlock(&ctl->tree_lock); |
f7039b1d LD |
2646 | ret = 0; |
2647 | continue; | |
2648 | } | |
2649 | } else { | |
2650 | start = entry->offset; | |
2651 | bytes = min(entry->bytes, end - start); | |
34d52cb6 | 2652 | unlink_free_space(ctl, entry); |
f789b684 | 2653 | kmem_cache_free(btrfs_free_space_cachep, entry); |
f7039b1d LD |
2654 | } |
2655 | ||
34d52cb6 | 2656 | spin_unlock(&ctl->tree_lock); |
f7039b1d LD |
2657 | |
2658 | if (bytes >= minlen) { | |
fb25e914 JB |
2659 | struct btrfs_space_info *space_info; |
2660 | int update = 0; | |
2661 | ||
2662 | space_info = block_group->space_info; | |
2663 | spin_lock(&space_info->lock); | |
2664 | spin_lock(&block_group->lock); | |
2665 | if (!block_group->ro) { | |
2666 | block_group->reserved += bytes; | |
2667 | space_info->bytes_reserved += bytes; | |
2668 | update = 1; | |
2669 | } | |
2670 | spin_unlock(&block_group->lock); | |
2671 | spin_unlock(&space_info->lock); | |
f7039b1d LD |
2672 | |
2673 | ret = btrfs_error_discard_extent(fs_info->extent_root, | |
2674 | start, | |
2675 | bytes, | |
2676 | &actually_trimmed); | |
2677 | ||
34d52cb6 | 2678 | btrfs_add_free_space(block_group, start, bytes); |
fb25e914 JB |
2679 | if (update) { |
2680 | spin_lock(&space_info->lock); | |
2681 | spin_lock(&block_group->lock); | |
2682 | if (block_group->ro) | |
2683 | space_info->bytes_readonly += bytes; | |
2684 | block_group->reserved -= bytes; | |
2685 | space_info->bytes_reserved -= bytes; | |
2686 | spin_unlock(&space_info->lock); | |
2687 | spin_unlock(&block_group->lock); | |
2688 | } | |
f7039b1d LD |
2689 | |
2690 | if (ret) | |
2691 | break; | |
2692 | *trimmed += actually_trimmed; | |
2693 | } | |
2694 | start += bytes; | |
2695 | bytes = 0; | |
2696 | ||
2697 | if (fatal_signal_pending(current)) { | |
2698 | ret = -ERESTARTSYS; | |
2699 | break; | |
2700 | } | |
2701 | ||
2702 | cond_resched(); | |
2703 | } | |
2704 | ||
2705 | return ret; | |
2706 | } | |
581bb050 LZ |
2707 | |
2708 | /* | |
2709 | * Find the left-most item in the cache tree, and then return the | |
2710 | * smallest inode number in the item. | |
2711 | * | |
2712 | * Note: the returned inode number may not be the smallest one in | |
2713 | * the tree, if the left-most item is a bitmap. | |
2714 | */ | |
2715 | u64 btrfs_find_ino_for_alloc(struct btrfs_root *fs_root) | |
2716 | { | |
2717 | struct btrfs_free_space_ctl *ctl = fs_root->free_ino_ctl; | |
2718 | struct btrfs_free_space *entry = NULL; | |
2719 | u64 ino = 0; | |
2720 | ||
2721 | spin_lock(&ctl->tree_lock); | |
2722 | ||
2723 | if (RB_EMPTY_ROOT(&ctl->free_space_offset)) | |
2724 | goto out; | |
2725 | ||
2726 | entry = rb_entry(rb_first(&ctl->free_space_offset), | |
2727 | struct btrfs_free_space, offset_index); | |
2728 | ||
2729 | if (!entry->bitmap) { | |
2730 | ino = entry->offset; | |
2731 | ||
2732 | unlink_free_space(ctl, entry); | |
2733 | entry->offset++; | |
2734 | entry->bytes--; | |
2735 | if (!entry->bytes) | |
2736 | kmem_cache_free(btrfs_free_space_cachep, entry); | |
2737 | else | |
2738 | link_free_space(ctl, entry); | |
2739 | } else { | |
2740 | u64 offset = 0; | |
2741 | u64 count = 1; | |
2742 | int ret; | |
2743 | ||
2744 | ret = search_bitmap(ctl, entry, &offset, &count); | |
2745 | BUG_ON(ret); | |
2746 | ||
2747 | ino = offset; | |
2748 | bitmap_clear_bits(ctl, entry, offset, 1); | |
2749 | if (entry->bytes == 0) | |
2750 | free_bitmap(ctl, entry); | |
2751 | } | |
2752 | out: | |
2753 | spin_unlock(&ctl->tree_lock); | |
2754 | ||
2755 | return ino; | |
2756 | } | |
82d5902d LZ |
2757 | |
2758 | struct inode *lookup_free_ino_inode(struct btrfs_root *root, | |
2759 | struct btrfs_path *path) | |
2760 | { | |
2761 | struct inode *inode = NULL; | |
2762 | ||
2763 | spin_lock(&root->cache_lock); | |
2764 | if (root->cache_inode) | |
2765 | inode = igrab(root->cache_inode); | |
2766 | spin_unlock(&root->cache_lock); | |
2767 | if (inode) | |
2768 | return inode; | |
2769 | ||
2770 | inode = __lookup_free_space_inode(root, path, 0); | |
2771 | if (IS_ERR(inode)) | |
2772 | return inode; | |
2773 | ||
2774 | spin_lock(&root->cache_lock); | |
7841cb28 | 2775 | if (!btrfs_fs_closing(root->fs_info)) |
82d5902d LZ |
2776 | root->cache_inode = igrab(inode); |
2777 | spin_unlock(&root->cache_lock); | |
2778 | ||
2779 | return inode; | |
2780 | } | |
2781 | ||
2782 | int create_free_ino_inode(struct btrfs_root *root, | |
2783 | struct btrfs_trans_handle *trans, | |
2784 | struct btrfs_path *path) | |
2785 | { | |
2786 | return __create_free_space_inode(root, trans, path, | |
2787 | BTRFS_FREE_INO_OBJECTID, 0); | |
2788 | } | |
2789 | ||
2790 | int load_free_ino_cache(struct btrfs_fs_info *fs_info, struct btrfs_root *root) | |
2791 | { | |
2792 | struct btrfs_free_space_ctl *ctl = root->free_ino_ctl; | |
2793 | struct btrfs_path *path; | |
2794 | struct inode *inode; | |
2795 | int ret = 0; | |
2796 | u64 root_gen = btrfs_root_generation(&root->root_item); | |
2797 | ||
4b9465cb CM |
2798 | if (!btrfs_test_opt(root, INODE_MAP_CACHE)) |
2799 | return 0; | |
2800 | ||
82d5902d LZ |
2801 | /* |
2802 | * If we're unmounting then just return, since this does a search on the | |
2803 | * normal root and not the commit root and we could deadlock. | |
2804 | */ | |
7841cb28 | 2805 | if (btrfs_fs_closing(fs_info)) |
82d5902d LZ |
2806 | return 0; |
2807 | ||
2808 | path = btrfs_alloc_path(); | |
2809 | if (!path) | |
2810 | return 0; | |
2811 | ||
2812 | inode = lookup_free_ino_inode(root, path); | |
2813 | if (IS_ERR(inode)) | |
2814 | goto out; | |
2815 | ||
2816 | if (root_gen != BTRFS_I(inode)->generation) | |
2817 | goto out_put; | |
2818 | ||
2819 | ret = __load_free_space_cache(root, inode, ctl, path, 0); | |
2820 | ||
2821 | if (ret < 0) | |
2822 | printk(KERN_ERR "btrfs: failed to load free ino cache for " | |
2823 | "root %llu\n", root->root_key.objectid); | |
2824 | out_put: | |
2825 | iput(inode); | |
2826 | out: | |
2827 | btrfs_free_path(path); | |
2828 | return ret; | |
2829 | } | |
2830 | ||
2831 | int btrfs_write_out_ino_cache(struct btrfs_root *root, | |
2832 | struct btrfs_trans_handle *trans, | |
2833 | struct btrfs_path *path) | |
2834 | { | |
2835 | struct btrfs_free_space_ctl *ctl = root->free_ino_ctl; | |
2836 | struct inode *inode; | |
2837 | int ret; | |
2838 | ||
4b9465cb CM |
2839 | if (!btrfs_test_opt(root, INODE_MAP_CACHE)) |
2840 | return 0; | |
2841 | ||
82d5902d LZ |
2842 | inode = lookup_free_ino_inode(root, path); |
2843 | if (IS_ERR(inode)) | |
2844 | return 0; | |
2845 | ||
2846 | ret = __btrfs_write_out_cache(root, inode, ctl, NULL, trans, path, 0); | |
c09544e0 JB |
2847 | if (ret) { |
2848 | btrfs_delalloc_release_metadata(inode, inode->i_size); | |
2849 | #ifdef DEBUG | |
82d5902d LZ |
2850 | printk(KERN_ERR "btrfs: failed to write free ino cache " |
2851 | "for root %llu\n", root->root_key.objectid); | |
c09544e0 JB |
2852 | #endif |
2853 | } | |
82d5902d LZ |
2854 | |
2855 | iput(inode); | |
2856 | return ret; | |
2857 | } |