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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" |
04216820 | 30 | #include "volumes.h" |
fa9c0d79 | 31 | |
0ef6447a | 32 | #define BITS_PER_BITMAP (PAGE_SIZE * 8UL) |
ee22184b | 33 | #define MAX_CACHE_BYTES_PER_GIG SZ_32K |
0f9dd46c | 34 | |
55507ce3 FM |
35 | struct btrfs_trim_range { |
36 | u64 start; | |
37 | u64 bytes; | |
38 | struct list_head list; | |
39 | }; | |
40 | ||
34d52cb6 | 41 | static int link_free_space(struct btrfs_free_space_ctl *ctl, |
0cb59c99 | 42 | struct btrfs_free_space *info); |
cd023e7b JB |
43 | static void unlink_free_space(struct btrfs_free_space_ctl *ctl, |
44 | struct btrfs_free_space *info); | |
afdb5718 JM |
45 | static int btrfs_wait_cache_io_root(struct btrfs_root *root, |
46 | struct btrfs_trans_handle *trans, | |
47 | struct btrfs_io_ctl *io_ctl, | |
48 | struct btrfs_path *path); | |
0cb59c99 | 49 | |
0414efae LZ |
50 | static struct inode *__lookup_free_space_inode(struct btrfs_root *root, |
51 | struct btrfs_path *path, | |
52 | u64 offset) | |
0af3d00b | 53 | { |
0b246afa | 54 | struct btrfs_fs_info *fs_info = root->fs_info; |
0af3d00b JB |
55 | struct btrfs_key key; |
56 | struct btrfs_key location; | |
57 | struct btrfs_disk_key disk_key; | |
58 | struct btrfs_free_space_header *header; | |
59 | struct extent_buffer *leaf; | |
60 | struct inode *inode = NULL; | |
61 | int ret; | |
62 | ||
0af3d00b | 63 | key.objectid = BTRFS_FREE_SPACE_OBJECTID; |
0414efae | 64 | key.offset = offset; |
0af3d00b JB |
65 | key.type = 0; |
66 | ||
67 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); | |
68 | if (ret < 0) | |
69 | return ERR_PTR(ret); | |
70 | if (ret > 0) { | |
b3b4aa74 | 71 | btrfs_release_path(path); |
0af3d00b JB |
72 | return ERR_PTR(-ENOENT); |
73 | } | |
74 | ||
75 | leaf = path->nodes[0]; | |
76 | header = btrfs_item_ptr(leaf, path->slots[0], | |
77 | struct btrfs_free_space_header); | |
78 | btrfs_free_space_key(leaf, header, &disk_key); | |
79 | btrfs_disk_key_to_cpu(&location, &disk_key); | |
b3b4aa74 | 80 | btrfs_release_path(path); |
0af3d00b | 81 | |
0b246afa | 82 | inode = btrfs_iget(fs_info->sb, &location, root, NULL); |
0af3d00b JB |
83 | if (IS_ERR(inode)) |
84 | return inode; | |
85 | if (is_bad_inode(inode)) { | |
86 | iput(inode); | |
87 | return ERR_PTR(-ENOENT); | |
88 | } | |
89 | ||
528c0327 | 90 | mapping_set_gfp_mask(inode->i_mapping, |
c62d2555 MH |
91 | mapping_gfp_constraint(inode->i_mapping, |
92 | ~(__GFP_FS | __GFP_HIGHMEM))); | |
adae52b9 | 93 | |
0414efae LZ |
94 | return inode; |
95 | } | |
96 | ||
97 | struct inode *lookup_free_space_inode(struct btrfs_root *root, | |
98 | struct btrfs_block_group_cache | |
99 | *block_group, struct btrfs_path *path) | |
100 | { | |
101 | struct inode *inode = NULL; | |
0b246afa | 102 | struct btrfs_fs_info *fs_info = root->fs_info; |
5b0e95bf | 103 | u32 flags = BTRFS_INODE_NODATASUM | BTRFS_INODE_NODATACOW; |
0414efae LZ |
104 | |
105 | spin_lock(&block_group->lock); | |
106 | if (block_group->inode) | |
107 | inode = igrab(block_group->inode); | |
108 | spin_unlock(&block_group->lock); | |
109 | if (inode) | |
110 | return inode; | |
111 | ||
112 | inode = __lookup_free_space_inode(root, path, | |
113 | block_group->key.objectid); | |
114 | if (IS_ERR(inode)) | |
115 | return inode; | |
116 | ||
0af3d00b | 117 | spin_lock(&block_group->lock); |
5b0e95bf | 118 | if (!((BTRFS_I(inode)->flags & flags) == flags)) { |
0b246afa | 119 | btrfs_info(fs_info, "Old style space inode found, converting."); |
5b0e95bf JB |
120 | BTRFS_I(inode)->flags |= BTRFS_INODE_NODATASUM | |
121 | BTRFS_INODE_NODATACOW; | |
2f356126 JB |
122 | block_group->disk_cache_state = BTRFS_DC_CLEAR; |
123 | } | |
124 | ||
300e4f8a | 125 | if (!block_group->iref) { |
0af3d00b JB |
126 | block_group->inode = igrab(inode); |
127 | block_group->iref = 1; | |
128 | } | |
129 | spin_unlock(&block_group->lock); | |
130 | ||
131 | return inode; | |
132 | } | |
133 | ||
48a3b636 ES |
134 | static int __create_free_space_inode(struct btrfs_root *root, |
135 | struct btrfs_trans_handle *trans, | |
136 | struct btrfs_path *path, | |
137 | u64 ino, u64 offset) | |
0af3d00b JB |
138 | { |
139 | struct btrfs_key key; | |
140 | struct btrfs_disk_key disk_key; | |
141 | struct btrfs_free_space_header *header; | |
142 | struct btrfs_inode_item *inode_item; | |
143 | struct extent_buffer *leaf; | |
5b0e95bf | 144 | u64 flags = BTRFS_INODE_NOCOMPRESS | BTRFS_INODE_PREALLOC; |
0af3d00b JB |
145 | int ret; |
146 | ||
0414efae | 147 | ret = btrfs_insert_empty_inode(trans, root, path, ino); |
0af3d00b JB |
148 | if (ret) |
149 | return ret; | |
150 | ||
5b0e95bf JB |
151 | /* We inline crc's for the free disk space cache */ |
152 | if (ino != BTRFS_FREE_INO_OBJECTID) | |
153 | flags |= BTRFS_INODE_NODATASUM | BTRFS_INODE_NODATACOW; | |
154 | ||
0af3d00b JB |
155 | leaf = path->nodes[0]; |
156 | inode_item = btrfs_item_ptr(leaf, path->slots[0], | |
157 | struct btrfs_inode_item); | |
158 | btrfs_item_key(leaf, &disk_key, path->slots[0]); | |
b159fa28 | 159 | memzero_extent_buffer(leaf, (unsigned long)inode_item, |
0af3d00b JB |
160 | sizeof(*inode_item)); |
161 | btrfs_set_inode_generation(leaf, inode_item, trans->transid); | |
162 | btrfs_set_inode_size(leaf, inode_item, 0); | |
163 | btrfs_set_inode_nbytes(leaf, inode_item, 0); | |
164 | btrfs_set_inode_uid(leaf, inode_item, 0); | |
165 | btrfs_set_inode_gid(leaf, inode_item, 0); | |
166 | btrfs_set_inode_mode(leaf, inode_item, S_IFREG | 0600); | |
5b0e95bf | 167 | btrfs_set_inode_flags(leaf, inode_item, flags); |
0af3d00b JB |
168 | btrfs_set_inode_nlink(leaf, inode_item, 1); |
169 | btrfs_set_inode_transid(leaf, inode_item, trans->transid); | |
0414efae | 170 | btrfs_set_inode_block_group(leaf, inode_item, offset); |
0af3d00b | 171 | btrfs_mark_buffer_dirty(leaf); |
b3b4aa74 | 172 | btrfs_release_path(path); |
0af3d00b JB |
173 | |
174 | key.objectid = BTRFS_FREE_SPACE_OBJECTID; | |
0414efae | 175 | key.offset = offset; |
0af3d00b | 176 | key.type = 0; |
0af3d00b JB |
177 | ret = btrfs_insert_empty_item(trans, root, path, &key, |
178 | sizeof(struct btrfs_free_space_header)); | |
179 | if (ret < 0) { | |
b3b4aa74 | 180 | btrfs_release_path(path); |
0af3d00b JB |
181 | return ret; |
182 | } | |
c9dc4c65 | 183 | |
0af3d00b JB |
184 | leaf = path->nodes[0]; |
185 | header = btrfs_item_ptr(leaf, path->slots[0], | |
186 | struct btrfs_free_space_header); | |
b159fa28 | 187 | memzero_extent_buffer(leaf, (unsigned long)header, sizeof(*header)); |
0af3d00b JB |
188 | btrfs_set_free_space_key(leaf, header, &disk_key); |
189 | btrfs_mark_buffer_dirty(leaf); | |
b3b4aa74 | 190 | btrfs_release_path(path); |
0af3d00b JB |
191 | |
192 | return 0; | |
193 | } | |
194 | ||
0414efae LZ |
195 | int create_free_space_inode(struct btrfs_root *root, |
196 | struct btrfs_trans_handle *trans, | |
197 | struct btrfs_block_group_cache *block_group, | |
198 | struct btrfs_path *path) | |
199 | { | |
200 | int ret; | |
201 | u64 ino; | |
202 | ||
203 | ret = btrfs_find_free_objectid(root, &ino); | |
204 | if (ret < 0) | |
205 | return ret; | |
206 | ||
207 | return __create_free_space_inode(root, trans, path, ino, | |
208 | block_group->key.objectid); | |
209 | } | |
210 | ||
2ff7e61e | 211 | int btrfs_check_trunc_cache_free_space(struct btrfs_fs_info *fs_info, |
7b61cd92 | 212 | struct btrfs_block_rsv *rsv) |
0af3d00b | 213 | { |
c8174313 | 214 | u64 needed_bytes; |
7b61cd92 | 215 | int ret; |
c8174313 JB |
216 | |
217 | /* 1 for slack space, 1 for updating the inode */ | |
0b246afa JM |
218 | needed_bytes = btrfs_calc_trunc_metadata_size(fs_info, 1) + |
219 | btrfs_calc_trans_metadata_size(fs_info, 1); | |
c8174313 | 220 | |
7b61cd92 MX |
221 | spin_lock(&rsv->lock); |
222 | if (rsv->reserved < needed_bytes) | |
223 | ret = -ENOSPC; | |
224 | else | |
225 | ret = 0; | |
226 | spin_unlock(&rsv->lock); | |
4b286cd1 | 227 | return ret; |
7b61cd92 MX |
228 | } |
229 | ||
230 | int btrfs_truncate_free_space_cache(struct btrfs_root *root, | |
231 | struct btrfs_trans_handle *trans, | |
1bbc621e | 232 | struct btrfs_block_group_cache *block_group, |
7b61cd92 MX |
233 | struct inode *inode) |
234 | { | |
7b61cd92 | 235 | int ret = 0; |
1bbc621e | 236 | struct btrfs_path *path = btrfs_alloc_path(); |
35c76642 | 237 | bool locked = false; |
1bbc621e CM |
238 | |
239 | if (!path) { | |
240 | ret = -ENOMEM; | |
241 | goto fail; | |
242 | } | |
243 | ||
244 | if (block_group) { | |
35c76642 | 245 | locked = true; |
1bbc621e CM |
246 | mutex_lock(&trans->transaction->cache_write_mutex); |
247 | if (!list_empty(&block_group->io_list)) { | |
248 | list_del_init(&block_group->io_list); | |
249 | ||
afdb5718 | 250 | btrfs_wait_cache_io(trans, block_group, path); |
1bbc621e CM |
251 | btrfs_put_block_group(block_group); |
252 | } | |
253 | ||
254 | /* | |
255 | * now that we've truncated the cache away, its no longer | |
256 | * setup or written | |
257 | */ | |
258 | spin_lock(&block_group->lock); | |
259 | block_group->disk_cache_state = BTRFS_DC_CLEAR; | |
260 | spin_unlock(&block_group->lock); | |
261 | } | |
262 | btrfs_free_path(path); | |
0af3d00b | 263 | |
0af3d00b | 264 | btrfs_i_size_write(inode, 0); |
7caef267 | 265 | truncate_pagecache(inode, 0); |
0af3d00b JB |
266 | |
267 | /* | |
268 | * We don't need an orphan item because truncating the free space cache | |
269 | * will never be split across transactions. | |
28ed1345 CM |
270 | * We don't need to check for -EAGAIN because we're a free space |
271 | * cache inode | |
0af3d00b JB |
272 | */ |
273 | ret = btrfs_truncate_inode_items(trans, root, inode, | |
274 | 0, BTRFS_EXTENT_DATA_KEY); | |
35c76642 FM |
275 | if (ret) |
276 | goto fail; | |
0af3d00b | 277 | |
82d5902d | 278 | ret = btrfs_update_inode(trans, root, inode); |
1bbc621e | 279 | |
1bbc621e | 280 | fail: |
35c76642 FM |
281 | if (locked) |
282 | mutex_unlock(&trans->transaction->cache_write_mutex); | |
79787eaa | 283 | if (ret) |
66642832 | 284 | btrfs_abort_transaction(trans, ret); |
c8174313 | 285 | |
82d5902d | 286 | return ret; |
0af3d00b JB |
287 | } |
288 | ||
1d480538 | 289 | static void readahead_cache(struct inode *inode) |
9d66e233 JB |
290 | { |
291 | struct file_ra_state *ra; | |
292 | unsigned long last_index; | |
293 | ||
294 | ra = kzalloc(sizeof(*ra), GFP_NOFS); | |
295 | if (!ra) | |
1d480538 | 296 | return; |
9d66e233 JB |
297 | |
298 | file_ra_state_init(ra, inode->i_mapping); | |
09cbfeaf | 299 | last_index = (i_size_read(inode) - 1) >> PAGE_SHIFT; |
9d66e233 JB |
300 | |
301 | page_cache_sync_readahead(inode->i_mapping, ra, NULL, 0, last_index); | |
302 | ||
303 | kfree(ra); | |
9d66e233 JB |
304 | } |
305 | ||
4c6d1d85 | 306 | static int io_ctl_init(struct btrfs_io_ctl *io_ctl, struct inode *inode, |
f15376df | 307 | int write) |
a67509c3 | 308 | { |
5349d6c3 MX |
309 | int num_pages; |
310 | int check_crcs = 0; | |
311 | ||
09cbfeaf | 312 | num_pages = DIV_ROUND_UP(i_size_read(inode), PAGE_SIZE); |
5349d6c3 | 313 | |
4a0cc7ca | 314 | if (btrfs_ino(BTRFS_I(inode)) != BTRFS_FREE_INO_OBJECTID) |
5349d6c3 MX |
315 | check_crcs = 1; |
316 | ||
317 | /* Make sure we can fit our crcs into the first page */ | |
318 | if (write && check_crcs && | |
09cbfeaf | 319 | (num_pages * sizeof(u32)) >= PAGE_SIZE) |
5349d6c3 MX |
320 | return -ENOSPC; |
321 | ||
4c6d1d85 | 322 | memset(io_ctl, 0, sizeof(struct btrfs_io_ctl)); |
5349d6c3 | 323 | |
31e818fe | 324 | io_ctl->pages = kcalloc(num_pages, sizeof(struct page *), GFP_NOFS); |
a67509c3 JB |
325 | if (!io_ctl->pages) |
326 | return -ENOMEM; | |
5349d6c3 MX |
327 | |
328 | io_ctl->num_pages = num_pages; | |
f15376df | 329 | io_ctl->fs_info = btrfs_sb(inode->i_sb); |
5349d6c3 | 330 | io_ctl->check_crcs = check_crcs; |
c9dc4c65 | 331 | io_ctl->inode = inode; |
5349d6c3 | 332 | |
a67509c3 JB |
333 | return 0; |
334 | } | |
335 | ||
4c6d1d85 | 336 | static void io_ctl_free(struct btrfs_io_ctl *io_ctl) |
a67509c3 JB |
337 | { |
338 | kfree(io_ctl->pages); | |
c9dc4c65 | 339 | io_ctl->pages = NULL; |
a67509c3 JB |
340 | } |
341 | ||
4c6d1d85 | 342 | static void io_ctl_unmap_page(struct btrfs_io_ctl *io_ctl) |
a67509c3 JB |
343 | { |
344 | if (io_ctl->cur) { | |
a67509c3 JB |
345 | io_ctl->cur = NULL; |
346 | io_ctl->orig = NULL; | |
347 | } | |
348 | } | |
349 | ||
4c6d1d85 | 350 | static void io_ctl_map_page(struct btrfs_io_ctl *io_ctl, int clear) |
a67509c3 | 351 | { |
b12d6869 | 352 | ASSERT(io_ctl->index < io_ctl->num_pages); |
a67509c3 | 353 | io_ctl->page = io_ctl->pages[io_ctl->index++]; |
2b108268 | 354 | io_ctl->cur = page_address(io_ctl->page); |
a67509c3 | 355 | io_ctl->orig = io_ctl->cur; |
09cbfeaf | 356 | io_ctl->size = PAGE_SIZE; |
a67509c3 | 357 | if (clear) |
09cbfeaf | 358 | memset(io_ctl->cur, 0, PAGE_SIZE); |
a67509c3 JB |
359 | } |
360 | ||
4c6d1d85 | 361 | static void io_ctl_drop_pages(struct btrfs_io_ctl *io_ctl) |
a67509c3 JB |
362 | { |
363 | int i; | |
364 | ||
365 | io_ctl_unmap_page(io_ctl); | |
366 | ||
367 | for (i = 0; i < io_ctl->num_pages; i++) { | |
a1ee5a45 LZ |
368 | if (io_ctl->pages[i]) { |
369 | ClearPageChecked(io_ctl->pages[i]); | |
370 | unlock_page(io_ctl->pages[i]); | |
09cbfeaf | 371 | put_page(io_ctl->pages[i]); |
a1ee5a45 | 372 | } |
a67509c3 JB |
373 | } |
374 | } | |
375 | ||
4c6d1d85 | 376 | static int io_ctl_prepare_pages(struct btrfs_io_ctl *io_ctl, struct inode *inode, |
a67509c3 JB |
377 | int uptodate) |
378 | { | |
379 | struct page *page; | |
380 | gfp_t mask = btrfs_alloc_write_mask(inode->i_mapping); | |
381 | int i; | |
382 | ||
383 | for (i = 0; i < io_ctl->num_pages; i++) { | |
384 | page = find_or_create_page(inode->i_mapping, i, mask); | |
385 | if (!page) { | |
386 | io_ctl_drop_pages(io_ctl); | |
387 | return -ENOMEM; | |
388 | } | |
389 | io_ctl->pages[i] = page; | |
390 | if (uptodate && !PageUptodate(page)) { | |
391 | btrfs_readpage(NULL, page); | |
392 | lock_page(page); | |
393 | if (!PageUptodate(page)) { | |
efe120a0 FH |
394 | btrfs_err(BTRFS_I(inode)->root->fs_info, |
395 | "error reading free space cache"); | |
a67509c3 JB |
396 | io_ctl_drop_pages(io_ctl); |
397 | return -EIO; | |
398 | } | |
399 | } | |
400 | } | |
401 | ||
f7d61dcd JB |
402 | for (i = 0; i < io_ctl->num_pages; i++) { |
403 | clear_page_dirty_for_io(io_ctl->pages[i]); | |
404 | set_page_extent_mapped(io_ctl->pages[i]); | |
405 | } | |
406 | ||
a67509c3 JB |
407 | return 0; |
408 | } | |
409 | ||
4c6d1d85 | 410 | static void io_ctl_set_generation(struct btrfs_io_ctl *io_ctl, u64 generation) |
a67509c3 | 411 | { |
528c0327 | 412 | __le64 *val; |
a67509c3 JB |
413 | |
414 | io_ctl_map_page(io_ctl, 1); | |
415 | ||
416 | /* | |
5b0e95bf JB |
417 | * Skip the csum areas. If we don't check crcs then we just have a |
418 | * 64bit chunk at the front of the first page. | |
a67509c3 | 419 | */ |
5b0e95bf JB |
420 | if (io_ctl->check_crcs) { |
421 | io_ctl->cur += (sizeof(u32) * io_ctl->num_pages); | |
422 | io_ctl->size -= sizeof(u64) + (sizeof(u32) * io_ctl->num_pages); | |
423 | } else { | |
424 | io_ctl->cur += sizeof(u64); | |
425 | io_ctl->size -= sizeof(u64) * 2; | |
426 | } | |
a67509c3 JB |
427 | |
428 | val = io_ctl->cur; | |
429 | *val = cpu_to_le64(generation); | |
430 | io_ctl->cur += sizeof(u64); | |
a67509c3 JB |
431 | } |
432 | ||
4c6d1d85 | 433 | static int io_ctl_check_generation(struct btrfs_io_ctl *io_ctl, u64 generation) |
a67509c3 | 434 | { |
528c0327 | 435 | __le64 *gen; |
a67509c3 | 436 | |
5b0e95bf JB |
437 | /* |
438 | * Skip the crc area. If we don't check crcs then we just have a 64bit | |
439 | * chunk at the front of the first page. | |
440 | */ | |
441 | if (io_ctl->check_crcs) { | |
442 | io_ctl->cur += sizeof(u32) * io_ctl->num_pages; | |
443 | io_ctl->size -= sizeof(u64) + | |
444 | (sizeof(u32) * io_ctl->num_pages); | |
445 | } else { | |
446 | io_ctl->cur += sizeof(u64); | |
447 | io_ctl->size -= sizeof(u64) * 2; | |
448 | } | |
a67509c3 | 449 | |
a67509c3 JB |
450 | gen = io_ctl->cur; |
451 | if (le64_to_cpu(*gen) != generation) { | |
f15376df | 452 | btrfs_err_rl(io_ctl->fs_info, |
94647322 DS |
453 | "space cache generation (%llu) does not match inode (%llu)", |
454 | *gen, generation); | |
a67509c3 JB |
455 | io_ctl_unmap_page(io_ctl); |
456 | return -EIO; | |
457 | } | |
458 | io_ctl->cur += sizeof(u64); | |
5b0e95bf JB |
459 | return 0; |
460 | } | |
461 | ||
4c6d1d85 | 462 | static void io_ctl_set_crc(struct btrfs_io_ctl *io_ctl, int index) |
5b0e95bf JB |
463 | { |
464 | u32 *tmp; | |
465 | u32 crc = ~(u32)0; | |
466 | unsigned offset = 0; | |
467 | ||
468 | if (!io_ctl->check_crcs) { | |
469 | io_ctl_unmap_page(io_ctl); | |
470 | return; | |
471 | } | |
472 | ||
473 | if (index == 0) | |
cb54f257 | 474 | offset = sizeof(u32) * io_ctl->num_pages; |
5b0e95bf | 475 | |
b0496686 | 476 | crc = btrfs_csum_data(io_ctl->orig + offset, crc, |
09cbfeaf | 477 | PAGE_SIZE - offset); |
0b5e3daf | 478 | btrfs_csum_final(crc, (u8 *)&crc); |
5b0e95bf | 479 | io_ctl_unmap_page(io_ctl); |
2b108268 | 480 | tmp = page_address(io_ctl->pages[0]); |
5b0e95bf JB |
481 | tmp += index; |
482 | *tmp = crc; | |
5b0e95bf JB |
483 | } |
484 | ||
4c6d1d85 | 485 | static int io_ctl_check_crc(struct btrfs_io_ctl *io_ctl, int index) |
5b0e95bf JB |
486 | { |
487 | u32 *tmp, val; | |
488 | u32 crc = ~(u32)0; | |
489 | unsigned offset = 0; | |
490 | ||
491 | if (!io_ctl->check_crcs) { | |
492 | io_ctl_map_page(io_ctl, 0); | |
493 | return 0; | |
494 | } | |
495 | ||
496 | if (index == 0) | |
497 | offset = sizeof(u32) * io_ctl->num_pages; | |
498 | ||
2b108268 | 499 | tmp = page_address(io_ctl->pages[0]); |
5b0e95bf JB |
500 | tmp += index; |
501 | val = *tmp; | |
5b0e95bf JB |
502 | |
503 | io_ctl_map_page(io_ctl, 0); | |
b0496686 | 504 | crc = btrfs_csum_data(io_ctl->orig + offset, crc, |
09cbfeaf | 505 | PAGE_SIZE - offset); |
0b5e3daf | 506 | btrfs_csum_final(crc, (u8 *)&crc); |
5b0e95bf | 507 | if (val != crc) { |
f15376df | 508 | btrfs_err_rl(io_ctl->fs_info, |
94647322 | 509 | "csum mismatch on free space cache"); |
5b0e95bf JB |
510 | io_ctl_unmap_page(io_ctl); |
511 | return -EIO; | |
512 | } | |
513 | ||
a67509c3 JB |
514 | return 0; |
515 | } | |
516 | ||
4c6d1d85 | 517 | static int io_ctl_add_entry(struct btrfs_io_ctl *io_ctl, u64 offset, u64 bytes, |
a67509c3 JB |
518 | void *bitmap) |
519 | { | |
520 | struct btrfs_free_space_entry *entry; | |
521 | ||
522 | if (!io_ctl->cur) | |
523 | return -ENOSPC; | |
524 | ||
525 | entry = io_ctl->cur; | |
526 | entry->offset = cpu_to_le64(offset); | |
527 | entry->bytes = cpu_to_le64(bytes); | |
528 | entry->type = (bitmap) ? BTRFS_FREE_SPACE_BITMAP : | |
529 | BTRFS_FREE_SPACE_EXTENT; | |
530 | io_ctl->cur += sizeof(struct btrfs_free_space_entry); | |
531 | io_ctl->size -= sizeof(struct btrfs_free_space_entry); | |
532 | ||
533 | if (io_ctl->size >= sizeof(struct btrfs_free_space_entry)) | |
534 | return 0; | |
535 | ||
5b0e95bf | 536 | io_ctl_set_crc(io_ctl, io_ctl->index - 1); |
a67509c3 JB |
537 | |
538 | /* No more pages to map */ | |
539 | if (io_ctl->index >= io_ctl->num_pages) | |
540 | return 0; | |
541 | ||
542 | /* map the next page */ | |
543 | io_ctl_map_page(io_ctl, 1); | |
544 | return 0; | |
545 | } | |
546 | ||
4c6d1d85 | 547 | static int io_ctl_add_bitmap(struct btrfs_io_ctl *io_ctl, void *bitmap) |
a67509c3 JB |
548 | { |
549 | if (!io_ctl->cur) | |
550 | return -ENOSPC; | |
551 | ||
552 | /* | |
553 | * If we aren't at the start of the current page, unmap this one and | |
554 | * map the next one if there is any left. | |
555 | */ | |
556 | if (io_ctl->cur != io_ctl->orig) { | |
5b0e95bf | 557 | io_ctl_set_crc(io_ctl, io_ctl->index - 1); |
a67509c3 JB |
558 | if (io_ctl->index >= io_ctl->num_pages) |
559 | return -ENOSPC; | |
560 | io_ctl_map_page(io_ctl, 0); | |
561 | } | |
562 | ||
09cbfeaf | 563 | memcpy(io_ctl->cur, bitmap, PAGE_SIZE); |
5b0e95bf | 564 | io_ctl_set_crc(io_ctl, io_ctl->index - 1); |
a67509c3 JB |
565 | if (io_ctl->index < io_ctl->num_pages) |
566 | io_ctl_map_page(io_ctl, 0); | |
567 | return 0; | |
568 | } | |
569 | ||
4c6d1d85 | 570 | static void io_ctl_zero_remaining_pages(struct btrfs_io_ctl *io_ctl) |
a67509c3 | 571 | { |
5b0e95bf JB |
572 | /* |
573 | * If we're not on the boundary we know we've modified the page and we | |
574 | * need to crc the page. | |
575 | */ | |
576 | if (io_ctl->cur != io_ctl->orig) | |
577 | io_ctl_set_crc(io_ctl, io_ctl->index - 1); | |
578 | else | |
579 | io_ctl_unmap_page(io_ctl); | |
a67509c3 JB |
580 | |
581 | while (io_ctl->index < io_ctl->num_pages) { | |
582 | io_ctl_map_page(io_ctl, 1); | |
5b0e95bf | 583 | io_ctl_set_crc(io_ctl, io_ctl->index - 1); |
a67509c3 JB |
584 | } |
585 | } | |
586 | ||
4c6d1d85 | 587 | static int io_ctl_read_entry(struct btrfs_io_ctl *io_ctl, |
5b0e95bf | 588 | struct btrfs_free_space *entry, u8 *type) |
a67509c3 JB |
589 | { |
590 | struct btrfs_free_space_entry *e; | |
2f120c05 JB |
591 | int ret; |
592 | ||
593 | if (!io_ctl->cur) { | |
594 | ret = io_ctl_check_crc(io_ctl, io_ctl->index); | |
595 | if (ret) | |
596 | return ret; | |
597 | } | |
a67509c3 JB |
598 | |
599 | e = io_ctl->cur; | |
600 | entry->offset = le64_to_cpu(e->offset); | |
601 | entry->bytes = le64_to_cpu(e->bytes); | |
5b0e95bf | 602 | *type = e->type; |
a67509c3 JB |
603 | io_ctl->cur += sizeof(struct btrfs_free_space_entry); |
604 | io_ctl->size -= sizeof(struct btrfs_free_space_entry); | |
605 | ||
606 | if (io_ctl->size >= sizeof(struct btrfs_free_space_entry)) | |
5b0e95bf | 607 | return 0; |
a67509c3 JB |
608 | |
609 | io_ctl_unmap_page(io_ctl); | |
610 | ||
2f120c05 | 611 | return 0; |
a67509c3 JB |
612 | } |
613 | ||
4c6d1d85 | 614 | static int io_ctl_read_bitmap(struct btrfs_io_ctl *io_ctl, |
5b0e95bf | 615 | struct btrfs_free_space *entry) |
a67509c3 | 616 | { |
5b0e95bf JB |
617 | int ret; |
618 | ||
5b0e95bf JB |
619 | ret = io_ctl_check_crc(io_ctl, io_ctl->index); |
620 | if (ret) | |
621 | return ret; | |
622 | ||
09cbfeaf | 623 | memcpy(entry->bitmap, io_ctl->cur, PAGE_SIZE); |
a67509c3 | 624 | io_ctl_unmap_page(io_ctl); |
5b0e95bf JB |
625 | |
626 | return 0; | |
a67509c3 JB |
627 | } |
628 | ||
cd023e7b JB |
629 | /* |
630 | * Since we attach pinned extents after the fact we can have contiguous sections | |
631 | * of free space that are split up in entries. This poses a problem with the | |
632 | * tree logging stuff since it could have allocated across what appears to be 2 | |
633 | * entries since we would have merged the entries when adding the pinned extents | |
634 | * back to the free space cache. So run through the space cache that we just | |
635 | * loaded and merge contiguous entries. This will make the log replay stuff not | |
636 | * blow up and it will make for nicer allocator behavior. | |
637 | */ | |
638 | static void merge_space_tree(struct btrfs_free_space_ctl *ctl) | |
639 | { | |
640 | struct btrfs_free_space *e, *prev = NULL; | |
641 | struct rb_node *n; | |
642 | ||
643 | again: | |
644 | spin_lock(&ctl->tree_lock); | |
645 | for (n = rb_first(&ctl->free_space_offset); n; n = rb_next(n)) { | |
646 | e = rb_entry(n, struct btrfs_free_space, offset_index); | |
647 | if (!prev) | |
648 | goto next; | |
649 | if (e->bitmap || prev->bitmap) | |
650 | goto next; | |
651 | if (prev->offset + prev->bytes == e->offset) { | |
652 | unlink_free_space(ctl, prev); | |
653 | unlink_free_space(ctl, e); | |
654 | prev->bytes += e->bytes; | |
655 | kmem_cache_free(btrfs_free_space_cachep, e); | |
656 | link_free_space(ctl, prev); | |
657 | prev = NULL; | |
658 | spin_unlock(&ctl->tree_lock); | |
659 | goto again; | |
660 | } | |
661 | next: | |
662 | prev = e; | |
663 | } | |
664 | spin_unlock(&ctl->tree_lock); | |
665 | } | |
666 | ||
48a3b636 ES |
667 | static int __load_free_space_cache(struct btrfs_root *root, struct inode *inode, |
668 | struct btrfs_free_space_ctl *ctl, | |
669 | struct btrfs_path *path, u64 offset) | |
9d66e233 | 670 | { |
0b246afa | 671 | struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); |
9d66e233 JB |
672 | struct btrfs_free_space_header *header; |
673 | struct extent_buffer *leaf; | |
4c6d1d85 | 674 | struct btrfs_io_ctl io_ctl; |
9d66e233 | 675 | struct btrfs_key key; |
a67509c3 | 676 | struct btrfs_free_space *e, *n; |
b76808fc | 677 | LIST_HEAD(bitmaps); |
9d66e233 JB |
678 | u64 num_entries; |
679 | u64 num_bitmaps; | |
680 | u64 generation; | |
a67509c3 | 681 | u8 type; |
f6a39829 | 682 | int ret = 0; |
9d66e233 | 683 | |
9d66e233 | 684 | /* Nothing in the space cache, goodbye */ |
0414efae | 685 | if (!i_size_read(inode)) |
a67509c3 | 686 | return 0; |
9d66e233 JB |
687 | |
688 | key.objectid = BTRFS_FREE_SPACE_OBJECTID; | |
0414efae | 689 | key.offset = offset; |
9d66e233 JB |
690 | key.type = 0; |
691 | ||
692 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); | |
0414efae | 693 | if (ret < 0) |
a67509c3 | 694 | return 0; |
0414efae | 695 | else if (ret > 0) { |
945d8962 | 696 | btrfs_release_path(path); |
a67509c3 | 697 | return 0; |
9d66e233 JB |
698 | } |
699 | ||
0414efae LZ |
700 | ret = -1; |
701 | ||
9d66e233 JB |
702 | leaf = path->nodes[0]; |
703 | header = btrfs_item_ptr(leaf, path->slots[0], | |
704 | struct btrfs_free_space_header); | |
705 | num_entries = btrfs_free_space_entries(leaf, header); | |
706 | num_bitmaps = btrfs_free_space_bitmaps(leaf, header); | |
707 | generation = btrfs_free_space_generation(leaf, header); | |
945d8962 | 708 | btrfs_release_path(path); |
9d66e233 | 709 | |
e570fd27 | 710 | if (!BTRFS_I(inode)->generation) { |
0b246afa | 711 | btrfs_info(fs_info, |
e570fd27 MX |
712 | "The free space cache file (%llu) is invalid. skip it\n", |
713 | offset); | |
714 | return 0; | |
715 | } | |
716 | ||
9d66e233 | 717 | if (BTRFS_I(inode)->generation != generation) { |
0b246afa JM |
718 | btrfs_err(fs_info, |
719 | "free space inode generation (%llu) did not match free space cache generation (%llu)", | |
720 | BTRFS_I(inode)->generation, generation); | |
a67509c3 | 721 | return 0; |
9d66e233 JB |
722 | } |
723 | ||
724 | if (!num_entries) | |
a67509c3 | 725 | return 0; |
9d66e233 | 726 | |
f15376df | 727 | ret = io_ctl_init(&io_ctl, inode, 0); |
706efc66 LZ |
728 | if (ret) |
729 | return ret; | |
730 | ||
1d480538 | 731 | readahead_cache(inode); |
9d66e233 | 732 | |
a67509c3 JB |
733 | ret = io_ctl_prepare_pages(&io_ctl, inode, 1); |
734 | if (ret) | |
735 | goto out; | |
9d66e233 | 736 | |
5b0e95bf JB |
737 | ret = io_ctl_check_crc(&io_ctl, 0); |
738 | if (ret) | |
739 | goto free_cache; | |
740 | ||
a67509c3 JB |
741 | ret = io_ctl_check_generation(&io_ctl, generation); |
742 | if (ret) | |
743 | goto free_cache; | |
9d66e233 | 744 | |
a67509c3 JB |
745 | while (num_entries) { |
746 | e = kmem_cache_zalloc(btrfs_free_space_cachep, | |
747 | GFP_NOFS); | |
748 | if (!e) | |
9d66e233 | 749 | goto free_cache; |
9d66e233 | 750 | |
5b0e95bf JB |
751 | ret = io_ctl_read_entry(&io_ctl, e, &type); |
752 | if (ret) { | |
753 | kmem_cache_free(btrfs_free_space_cachep, e); | |
754 | goto free_cache; | |
755 | } | |
756 | ||
a67509c3 JB |
757 | if (!e->bytes) { |
758 | kmem_cache_free(btrfs_free_space_cachep, e); | |
759 | goto free_cache; | |
9d66e233 | 760 | } |
a67509c3 JB |
761 | |
762 | if (type == BTRFS_FREE_SPACE_EXTENT) { | |
763 | spin_lock(&ctl->tree_lock); | |
764 | ret = link_free_space(ctl, e); | |
765 | spin_unlock(&ctl->tree_lock); | |
766 | if (ret) { | |
0b246afa | 767 | btrfs_err(fs_info, |
c2cf52eb | 768 | "Duplicate entries in free space cache, dumping"); |
a67509c3 | 769 | kmem_cache_free(btrfs_free_space_cachep, e); |
9d66e233 JB |
770 | goto free_cache; |
771 | } | |
a67509c3 | 772 | } else { |
b12d6869 | 773 | ASSERT(num_bitmaps); |
a67509c3 | 774 | num_bitmaps--; |
09cbfeaf | 775 | e->bitmap = kzalloc(PAGE_SIZE, GFP_NOFS); |
a67509c3 JB |
776 | if (!e->bitmap) { |
777 | kmem_cache_free( | |
778 | btrfs_free_space_cachep, e); | |
9d66e233 JB |
779 | goto free_cache; |
780 | } | |
a67509c3 JB |
781 | spin_lock(&ctl->tree_lock); |
782 | ret = link_free_space(ctl, e); | |
783 | ctl->total_bitmaps++; | |
784 | ctl->op->recalc_thresholds(ctl); | |
785 | spin_unlock(&ctl->tree_lock); | |
786 | if (ret) { | |
0b246afa | 787 | btrfs_err(fs_info, |
c2cf52eb | 788 | "Duplicate entries in free space cache, dumping"); |
dc89e982 | 789 | kmem_cache_free(btrfs_free_space_cachep, e); |
9d66e233 JB |
790 | goto free_cache; |
791 | } | |
a67509c3 | 792 | list_add_tail(&e->list, &bitmaps); |
9d66e233 JB |
793 | } |
794 | ||
a67509c3 JB |
795 | num_entries--; |
796 | } | |
9d66e233 | 797 | |
2f120c05 JB |
798 | io_ctl_unmap_page(&io_ctl); |
799 | ||
a67509c3 JB |
800 | /* |
801 | * We add the bitmaps at the end of the entries in order that | |
802 | * the bitmap entries are added to the cache. | |
803 | */ | |
804 | list_for_each_entry_safe(e, n, &bitmaps, list) { | |
9d66e233 | 805 | list_del_init(&e->list); |
5b0e95bf JB |
806 | ret = io_ctl_read_bitmap(&io_ctl, e); |
807 | if (ret) | |
808 | goto free_cache; | |
9d66e233 JB |
809 | } |
810 | ||
a67509c3 | 811 | io_ctl_drop_pages(&io_ctl); |
cd023e7b | 812 | merge_space_tree(ctl); |
9d66e233 JB |
813 | ret = 1; |
814 | out: | |
a67509c3 | 815 | io_ctl_free(&io_ctl); |
9d66e233 | 816 | return ret; |
9d66e233 | 817 | free_cache: |
a67509c3 | 818 | io_ctl_drop_pages(&io_ctl); |
0414efae | 819 | __btrfs_remove_free_space_cache(ctl); |
9d66e233 JB |
820 | goto out; |
821 | } | |
822 | ||
0414efae LZ |
823 | int load_free_space_cache(struct btrfs_fs_info *fs_info, |
824 | struct btrfs_block_group_cache *block_group) | |
0cb59c99 | 825 | { |
34d52cb6 | 826 | struct btrfs_free_space_ctl *ctl = block_group->free_space_ctl; |
0414efae LZ |
827 | struct btrfs_root *root = fs_info->tree_root; |
828 | struct inode *inode; | |
829 | struct btrfs_path *path; | |
5b0e95bf | 830 | int ret = 0; |
0414efae LZ |
831 | bool matched; |
832 | u64 used = btrfs_block_group_used(&block_group->item); | |
833 | ||
0414efae LZ |
834 | /* |
835 | * If this block group has been marked to be cleared for one reason or | |
836 | * another then we can't trust the on disk cache, so just return. | |
837 | */ | |
9d66e233 | 838 | spin_lock(&block_group->lock); |
0414efae LZ |
839 | if (block_group->disk_cache_state != BTRFS_DC_WRITTEN) { |
840 | spin_unlock(&block_group->lock); | |
841 | return 0; | |
842 | } | |
9d66e233 | 843 | spin_unlock(&block_group->lock); |
0414efae LZ |
844 | |
845 | path = btrfs_alloc_path(); | |
846 | if (!path) | |
847 | return 0; | |
d53ba474 JB |
848 | path->search_commit_root = 1; |
849 | path->skip_locking = 1; | |
0414efae LZ |
850 | |
851 | inode = lookup_free_space_inode(root, block_group, path); | |
852 | if (IS_ERR(inode)) { | |
853 | btrfs_free_path(path); | |
854 | return 0; | |
855 | } | |
856 | ||
5b0e95bf JB |
857 | /* We may have converted the inode and made the cache invalid. */ |
858 | spin_lock(&block_group->lock); | |
859 | if (block_group->disk_cache_state != BTRFS_DC_WRITTEN) { | |
860 | spin_unlock(&block_group->lock); | |
a7e221e9 | 861 | btrfs_free_path(path); |
5b0e95bf JB |
862 | goto out; |
863 | } | |
864 | spin_unlock(&block_group->lock); | |
865 | ||
0414efae LZ |
866 | ret = __load_free_space_cache(fs_info->tree_root, inode, ctl, |
867 | path, block_group->key.objectid); | |
868 | btrfs_free_path(path); | |
869 | if (ret <= 0) | |
870 | goto out; | |
871 | ||
872 | spin_lock(&ctl->tree_lock); | |
873 | matched = (ctl->free_space == (block_group->key.offset - used - | |
874 | block_group->bytes_super)); | |
875 | spin_unlock(&ctl->tree_lock); | |
876 | ||
877 | if (!matched) { | |
878 | __btrfs_remove_free_space_cache(ctl); | |
5d163e0e JM |
879 | btrfs_warn(fs_info, |
880 | "block group %llu has wrong amount of free space", | |
881 | block_group->key.objectid); | |
0414efae LZ |
882 | ret = -1; |
883 | } | |
884 | out: | |
885 | if (ret < 0) { | |
886 | /* This cache is bogus, make sure it gets cleared */ | |
887 | spin_lock(&block_group->lock); | |
888 | block_group->disk_cache_state = BTRFS_DC_CLEAR; | |
889 | spin_unlock(&block_group->lock); | |
82d5902d | 890 | ret = 0; |
0414efae | 891 | |
5d163e0e JM |
892 | btrfs_warn(fs_info, |
893 | "failed to load free space cache for block group %llu, rebuilding it now", | |
894 | block_group->key.objectid); | |
0414efae LZ |
895 | } |
896 | ||
897 | iput(inode); | |
898 | return ret; | |
9d66e233 JB |
899 | } |
900 | ||
d4452bc5 | 901 | static noinline_for_stack |
4c6d1d85 | 902 | int write_cache_extent_entries(struct btrfs_io_ctl *io_ctl, |
d4452bc5 CM |
903 | struct btrfs_free_space_ctl *ctl, |
904 | struct btrfs_block_group_cache *block_group, | |
905 | int *entries, int *bitmaps, | |
906 | struct list_head *bitmap_list) | |
0cb59c99 | 907 | { |
c09544e0 | 908 | int ret; |
d4452bc5 | 909 | struct btrfs_free_cluster *cluster = NULL; |
1bbc621e | 910 | struct btrfs_free_cluster *cluster_locked = NULL; |
d4452bc5 | 911 | struct rb_node *node = rb_first(&ctl->free_space_offset); |
55507ce3 | 912 | struct btrfs_trim_range *trim_entry; |
be1a12a0 | 913 | |
43be2146 | 914 | /* Get the cluster for this block_group if it exists */ |
d4452bc5 | 915 | if (block_group && !list_empty(&block_group->cluster_list)) { |
43be2146 JB |
916 | cluster = list_entry(block_group->cluster_list.next, |
917 | struct btrfs_free_cluster, | |
918 | block_group_list); | |
d4452bc5 | 919 | } |
43be2146 | 920 | |
f75b130e | 921 | if (!node && cluster) { |
1bbc621e CM |
922 | cluster_locked = cluster; |
923 | spin_lock(&cluster_locked->lock); | |
f75b130e JB |
924 | node = rb_first(&cluster->root); |
925 | cluster = NULL; | |
926 | } | |
927 | ||
a67509c3 JB |
928 | /* Write out the extent entries */ |
929 | while (node) { | |
930 | struct btrfs_free_space *e; | |
0cb59c99 | 931 | |
a67509c3 | 932 | e = rb_entry(node, struct btrfs_free_space, offset_index); |
d4452bc5 | 933 | *entries += 1; |
0cb59c99 | 934 | |
d4452bc5 | 935 | ret = io_ctl_add_entry(io_ctl, e->offset, e->bytes, |
a67509c3 JB |
936 | e->bitmap); |
937 | if (ret) | |
d4452bc5 | 938 | goto fail; |
2f356126 | 939 | |
a67509c3 | 940 | if (e->bitmap) { |
d4452bc5 CM |
941 | list_add_tail(&e->list, bitmap_list); |
942 | *bitmaps += 1; | |
2f356126 | 943 | } |
a67509c3 JB |
944 | node = rb_next(node); |
945 | if (!node && cluster) { | |
946 | node = rb_first(&cluster->root); | |
1bbc621e CM |
947 | cluster_locked = cluster; |
948 | spin_lock(&cluster_locked->lock); | |
a67509c3 | 949 | cluster = NULL; |
43be2146 | 950 | } |
a67509c3 | 951 | } |
1bbc621e CM |
952 | if (cluster_locked) { |
953 | spin_unlock(&cluster_locked->lock); | |
954 | cluster_locked = NULL; | |
955 | } | |
55507ce3 FM |
956 | |
957 | /* | |
958 | * Make sure we don't miss any range that was removed from our rbtree | |
959 | * because trimming is running. Otherwise after a umount+mount (or crash | |
960 | * after committing the transaction) we would leak free space and get | |
961 | * an inconsistent free space cache report from fsck. | |
962 | */ | |
963 | list_for_each_entry(trim_entry, &ctl->trimming_ranges, list) { | |
964 | ret = io_ctl_add_entry(io_ctl, trim_entry->start, | |
965 | trim_entry->bytes, NULL); | |
966 | if (ret) | |
967 | goto fail; | |
968 | *entries += 1; | |
969 | } | |
970 | ||
d4452bc5 CM |
971 | return 0; |
972 | fail: | |
1bbc621e CM |
973 | if (cluster_locked) |
974 | spin_unlock(&cluster_locked->lock); | |
d4452bc5 CM |
975 | return -ENOSPC; |
976 | } | |
977 | ||
978 | static noinline_for_stack int | |
979 | update_cache_item(struct btrfs_trans_handle *trans, | |
980 | struct btrfs_root *root, | |
981 | struct inode *inode, | |
982 | struct btrfs_path *path, u64 offset, | |
983 | int entries, int bitmaps) | |
984 | { | |
985 | struct btrfs_key key; | |
986 | struct btrfs_free_space_header *header; | |
987 | struct extent_buffer *leaf; | |
988 | int ret; | |
989 | ||
990 | key.objectid = BTRFS_FREE_SPACE_OBJECTID; | |
991 | key.offset = offset; | |
992 | key.type = 0; | |
993 | ||
994 | ret = btrfs_search_slot(trans, root, &key, path, 0, 1); | |
995 | if (ret < 0) { | |
996 | clear_extent_bit(&BTRFS_I(inode)->io_tree, 0, inode->i_size - 1, | |
997 | EXTENT_DIRTY | EXTENT_DELALLOC, 0, 0, NULL, | |
998 | GFP_NOFS); | |
999 | goto fail; | |
1000 | } | |
1001 | leaf = path->nodes[0]; | |
1002 | if (ret > 0) { | |
1003 | struct btrfs_key found_key; | |
1004 | ASSERT(path->slots[0]); | |
1005 | path->slots[0]--; | |
1006 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); | |
1007 | if (found_key.objectid != BTRFS_FREE_SPACE_OBJECTID || | |
1008 | found_key.offset != offset) { | |
1009 | clear_extent_bit(&BTRFS_I(inode)->io_tree, 0, | |
1010 | inode->i_size - 1, | |
1011 | EXTENT_DIRTY | EXTENT_DELALLOC, 0, 0, | |
1012 | NULL, GFP_NOFS); | |
1013 | btrfs_release_path(path); | |
1014 | goto fail; | |
1015 | } | |
1016 | } | |
1017 | ||
1018 | BTRFS_I(inode)->generation = trans->transid; | |
1019 | header = btrfs_item_ptr(leaf, path->slots[0], | |
1020 | struct btrfs_free_space_header); | |
1021 | btrfs_set_free_space_entries(leaf, header, entries); | |
1022 | btrfs_set_free_space_bitmaps(leaf, header, bitmaps); | |
1023 | btrfs_set_free_space_generation(leaf, header, trans->transid); | |
1024 | btrfs_mark_buffer_dirty(leaf); | |
1025 | btrfs_release_path(path); | |
1026 | ||
1027 | return 0; | |
1028 | ||
1029 | fail: | |
1030 | return -1; | |
1031 | } | |
1032 | ||
1033 | static noinline_for_stack int | |
2ff7e61e | 1034 | write_pinned_extent_entries(struct btrfs_fs_info *fs_info, |
5349d6c3 | 1035 | struct btrfs_block_group_cache *block_group, |
4c6d1d85 | 1036 | struct btrfs_io_ctl *io_ctl, |
5349d6c3 | 1037 | int *entries) |
d4452bc5 CM |
1038 | { |
1039 | u64 start, extent_start, extent_end, len; | |
d4452bc5 CM |
1040 | struct extent_io_tree *unpin = NULL; |
1041 | int ret; | |
43be2146 | 1042 | |
5349d6c3 MX |
1043 | if (!block_group) |
1044 | return 0; | |
1045 | ||
a67509c3 JB |
1046 | /* |
1047 | * We want to add any pinned extents to our free space cache | |
1048 | * so we don't leak the space | |
d4452bc5 | 1049 | * |
db804f23 LZ |
1050 | * We shouldn't have switched the pinned extents yet so this is the |
1051 | * right one | |
1052 | */ | |
0b246afa | 1053 | unpin = fs_info->pinned_extents; |
db804f23 | 1054 | |
5349d6c3 | 1055 | start = block_group->key.objectid; |
db804f23 | 1056 | |
5349d6c3 | 1057 | while (start < block_group->key.objectid + block_group->key.offset) { |
db804f23 LZ |
1058 | ret = find_first_extent_bit(unpin, start, |
1059 | &extent_start, &extent_end, | |
e6138876 | 1060 | EXTENT_DIRTY, NULL); |
5349d6c3 MX |
1061 | if (ret) |
1062 | return 0; | |
0cb59c99 | 1063 | |
a67509c3 | 1064 | /* This pinned extent is out of our range */ |
db804f23 | 1065 | if (extent_start >= block_group->key.objectid + |
a67509c3 | 1066 | block_group->key.offset) |
5349d6c3 | 1067 | return 0; |
2f356126 | 1068 | |
db804f23 LZ |
1069 | extent_start = max(extent_start, start); |
1070 | extent_end = min(block_group->key.objectid + | |
1071 | block_group->key.offset, extent_end + 1); | |
1072 | len = extent_end - extent_start; | |
0cb59c99 | 1073 | |
d4452bc5 CM |
1074 | *entries += 1; |
1075 | ret = io_ctl_add_entry(io_ctl, extent_start, len, NULL); | |
a67509c3 | 1076 | if (ret) |
5349d6c3 | 1077 | return -ENOSPC; |
0cb59c99 | 1078 | |
db804f23 | 1079 | start = extent_end; |
a67509c3 | 1080 | } |
0cb59c99 | 1081 | |
5349d6c3 MX |
1082 | return 0; |
1083 | } | |
1084 | ||
1085 | static noinline_for_stack int | |
4c6d1d85 | 1086 | write_bitmap_entries(struct btrfs_io_ctl *io_ctl, struct list_head *bitmap_list) |
5349d6c3 | 1087 | { |
7ae1681e | 1088 | struct btrfs_free_space *entry, *next; |
5349d6c3 MX |
1089 | int ret; |
1090 | ||
0cb59c99 | 1091 | /* Write out the bitmaps */ |
7ae1681e | 1092 | list_for_each_entry_safe(entry, next, bitmap_list, list) { |
d4452bc5 | 1093 | ret = io_ctl_add_bitmap(io_ctl, entry->bitmap); |
a67509c3 | 1094 | if (ret) |
5349d6c3 | 1095 | return -ENOSPC; |
0cb59c99 | 1096 | list_del_init(&entry->list); |
be1a12a0 JB |
1097 | } |
1098 | ||
5349d6c3 MX |
1099 | return 0; |
1100 | } | |
0cb59c99 | 1101 | |
5349d6c3 MX |
1102 | static int flush_dirty_cache(struct inode *inode) |
1103 | { | |
1104 | int ret; | |
be1a12a0 | 1105 | |
0ef8b726 | 1106 | ret = btrfs_wait_ordered_range(inode, 0, (u64)-1); |
5349d6c3 | 1107 | if (ret) |
0ef8b726 JB |
1108 | clear_extent_bit(&BTRFS_I(inode)->io_tree, 0, inode->i_size - 1, |
1109 | EXTENT_DIRTY | EXTENT_DELALLOC, 0, 0, NULL, | |
1110 | GFP_NOFS); | |
0cb59c99 | 1111 | |
5349d6c3 | 1112 | return ret; |
d4452bc5 CM |
1113 | } |
1114 | ||
1115 | static void noinline_for_stack | |
a3bdccc4 | 1116 | cleanup_bitmap_list(struct list_head *bitmap_list) |
d4452bc5 | 1117 | { |
7ae1681e | 1118 | struct btrfs_free_space *entry, *next; |
5349d6c3 | 1119 | |
7ae1681e | 1120 | list_for_each_entry_safe(entry, next, bitmap_list, list) |
d4452bc5 | 1121 | list_del_init(&entry->list); |
a3bdccc4 CM |
1122 | } |
1123 | ||
1124 | static void noinline_for_stack | |
1125 | cleanup_write_cache_enospc(struct inode *inode, | |
1126 | struct btrfs_io_ctl *io_ctl, | |
1127 | struct extent_state **cached_state, | |
1128 | struct list_head *bitmap_list) | |
1129 | { | |
d4452bc5 CM |
1130 | io_ctl_drop_pages(io_ctl); |
1131 | unlock_extent_cached(&BTRFS_I(inode)->io_tree, 0, | |
1132 | i_size_read(inode) - 1, cached_state, | |
1133 | GFP_NOFS); | |
1134 | } | |
549b4fdb | 1135 | |
afdb5718 JM |
1136 | static int __btrfs_wait_cache_io(struct btrfs_root *root, |
1137 | struct btrfs_trans_handle *trans, | |
1138 | struct btrfs_block_group_cache *block_group, | |
1139 | struct btrfs_io_ctl *io_ctl, | |
1140 | struct btrfs_path *path, u64 offset) | |
c9dc4c65 CM |
1141 | { |
1142 | int ret; | |
1143 | struct inode *inode = io_ctl->inode; | |
0b246afa | 1144 | struct btrfs_fs_info *fs_info; |
c9dc4c65 | 1145 | |
1bbc621e CM |
1146 | if (!inode) |
1147 | return 0; | |
1148 | ||
0b246afa JM |
1149 | fs_info = btrfs_sb(inode->i_sb); |
1150 | ||
c9dc4c65 CM |
1151 | /* Flush the dirty pages in the cache file. */ |
1152 | ret = flush_dirty_cache(inode); | |
1153 | if (ret) | |
1154 | goto out; | |
1155 | ||
1156 | /* Update the cache item to tell everyone this cache file is valid. */ | |
1157 | ret = update_cache_item(trans, root, inode, path, offset, | |
1158 | io_ctl->entries, io_ctl->bitmaps); | |
1159 | out: | |
1160 | io_ctl_free(io_ctl); | |
1161 | if (ret) { | |
1162 | invalidate_inode_pages2(inode->i_mapping); | |
1163 | BTRFS_I(inode)->generation = 0; | |
1164 | if (block_group) { | |
1165 | #ifdef DEBUG | |
0b246afa JM |
1166 | btrfs_err(fs_info, |
1167 | "failed to write free space cache for block group %llu", | |
1168 | block_group->key.objectid); | |
c9dc4c65 CM |
1169 | #endif |
1170 | } | |
1171 | } | |
1172 | btrfs_update_inode(trans, root, inode); | |
1173 | ||
1174 | if (block_group) { | |
1bbc621e CM |
1175 | /* the dirty list is protected by the dirty_bgs_lock */ |
1176 | spin_lock(&trans->transaction->dirty_bgs_lock); | |
1177 | ||
1178 | /* the disk_cache_state is protected by the block group lock */ | |
c9dc4c65 CM |
1179 | spin_lock(&block_group->lock); |
1180 | ||
1181 | /* | |
1182 | * only mark this as written if we didn't get put back on | |
1bbc621e CM |
1183 | * the dirty list while waiting for IO. Otherwise our |
1184 | * cache state won't be right, and we won't get written again | |
c9dc4c65 CM |
1185 | */ |
1186 | if (!ret && list_empty(&block_group->dirty_list)) | |
1187 | block_group->disk_cache_state = BTRFS_DC_WRITTEN; | |
1188 | else if (ret) | |
1189 | block_group->disk_cache_state = BTRFS_DC_ERROR; | |
1190 | ||
1191 | spin_unlock(&block_group->lock); | |
1bbc621e | 1192 | spin_unlock(&trans->transaction->dirty_bgs_lock); |
c9dc4c65 CM |
1193 | io_ctl->inode = NULL; |
1194 | iput(inode); | |
1195 | } | |
1196 | ||
1197 | return ret; | |
1198 | ||
1199 | } | |
1200 | ||
afdb5718 JM |
1201 | static int btrfs_wait_cache_io_root(struct btrfs_root *root, |
1202 | struct btrfs_trans_handle *trans, | |
1203 | struct btrfs_io_ctl *io_ctl, | |
1204 | struct btrfs_path *path) | |
1205 | { | |
1206 | return __btrfs_wait_cache_io(root, trans, NULL, io_ctl, path, 0); | |
1207 | } | |
1208 | ||
1209 | int btrfs_wait_cache_io(struct btrfs_trans_handle *trans, | |
1210 | struct btrfs_block_group_cache *block_group, | |
1211 | struct btrfs_path *path) | |
1212 | { | |
1213 | return __btrfs_wait_cache_io(block_group->fs_info->tree_root, trans, | |
1214 | block_group, &block_group->io_ctl, | |
1215 | path, block_group->key.objectid); | |
1216 | } | |
1217 | ||
d4452bc5 CM |
1218 | /** |
1219 | * __btrfs_write_out_cache - write out cached info to an inode | |
1220 | * @root - the root the inode belongs to | |
1221 | * @ctl - the free space cache we are going to write out | |
1222 | * @block_group - the block_group for this cache if it belongs to a block_group | |
1223 | * @trans - the trans handle | |
1224 | * @path - the path to use | |
1225 | * @offset - the offset for the key we'll insert | |
1226 | * | |
1227 | * This function writes out a free space cache struct to disk for quick recovery | |
8cd1e731 | 1228 | * on mount. This will return 0 if it was successful in writing the cache out, |
b8605454 | 1229 | * or an errno if it was not. |
d4452bc5 CM |
1230 | */ |
1231 | static int __btrfs_write_out_cache(struct btrfs_root *root, struct inode *inode, | |
1232 | struct btrfs_free_space_ctl *ctl, | |
1233 | struct btrfs_block_group_cache *block_group, | |
c9dc4c65 | 1234 | struct btrfs_io_ctl *io_ctl, |
d4452bc5 CM |
1235 | struct btrfs_trans_handle *trans, |
1236 | struct btrfs_path *path, u64 offset) | |
1237 | { | |
2ff7e61e | 1238 | struct btrfs_fs_info *fs_info = root->fs_info; |
d4452bc5 | 1239 | struct extent_state *cached_state = NULL; |
5349d6c3 | 1240 | LIST_HEAD(bitmap_list); |
d4452bc5 CM |
1241 | int entries = 0; |
1242 | int bitmaps = 0; | |
1243 | int ret; | |
c9dc4c65 | 1244 | int must_iput = 0; |
d4452bc5 CM |
1245 | |
1246 | if (!i_size_read(inode)) | |
b8605454 | 1247 | return -EIO; |
d4452bc5 | 1248 | |
c9dc4c65 | 1249 | WARN_ON(io_ctl->pages); |
f15376df | 1250 | ret = io_ctl_init(io_ctl, inode, 1); |
d4452bc5 | 1251 | if (ret) |
b8605454 | 1252 | return ret; |
d4452bc5 | 1253 | |
e570fd27 MX |
1254 | if (block_group && (block_group->flags & BTRFS_BLOCK_GROUP_DATA)) { |
1255 | down_write(&block_group->data_rwsem); | |
1256 | spin_lock(&block_group->lock); | |
1257 | if (block_group->delalloc_bytes) { | |
1258 | block_group->disk_cache_state = BTRFS_DC_WRITTEN; | |
1259 | spin_unlock(&block_group->lock); | |
1260 | up_write(&block_group->data_rwsem); | |
1261 | BTRFS_I(inode)->generation = 0; | |
1262 | ret = 0; | |
c9dc4c65 | 1263 | must_iput = 1; |
e570fd27 MX |
1264 | goto out; |
1265 | } | |
1266 | spin_unlock(&block_group->lock); | |
1267 | } | |
1268 | ||
d4452bc5 | 1269 | /* Lock all pages first so we can lock the extent safely. */ |
b8605454 OS |
1270 | ret = io_ctl_prepare_pages(io_ctl, inode, 0); |
1271 | if (ret) | |
1272 | goto out; | |
d4452bc5 CM |
1273 | |
1274 | lock_extent_bits(&BTRFS_I(inode)->io_tree, 0, i_size_read(inode) - 1, | |
ff13db41 | 1275 | &cached_state); |
d4452bc5 | 1276 | |
c9dc4c65 | 1277 | io_ctl_set_generation(io_ctl, trans->transid); |
d4452bc5 | 1278 | |
55507ce3 | 1279 | mutex_lock(&ctl->cache_writeout_mutex); |
5349d6c3 | 1280 | /* Write out the extent entries in the free space cache */ |
1bbc621e | 1281 | spin_lock(&ctl->tree_lock); |
c9dc4c65 | 1282 | ret = write_cache_extent_entries(io_ctl, ctl, |
d4452bc5 CM |
1283 | block_group, &entries, &bitmaps, |
1284 | &bitmap_list); | |
a3bdccc4 CM |
1285 | if (ret) |
1286 | goto out_nospc_locked; | |
d4452bc5 | 1287 | |
5349d6c3 MX |
1288 | /* |
1289 | * Some spaces that are freed in the current transaction are pinned, | |
1290 | * they will be added into free space cache after the transaction is | |
1291 | * committed, we shouldn't lose them. | |
1bbc621e CM |
1292 | * |
1293 | * If this changes while we are working we'll get added back to | |
1294 | * the dirty list and redo it. No locking needed | |
5349d6c3 | 1295 | */ |
2ff7e61e JM |
1296 | ret = write_pinned_extent_entries(fs_info, block_group, |
1297 | io_ctl, &entries); | |
a3bdccc4 CM |
1298 | if (ret) |
1299 | goto out_nospc_locked; | |
5349d6c3 | 1300 | |
55507ce3 FM |
1301 | /* |
1302 | * At last, we write out all the bitmaps and keep cache_writeout_mutex | |
1303 | * locked while doing it because a concurrent trim can be manipulating | |
1304 | * or freeing the bitmap. | |
1305 | */ | |
c9dc4c65 | 1306 | ret = write_bitmap_entries(io_ctl, &bitmap_list); |
1bbc621e | 1307 | spin_unlock(&ctl->tree_lock); |
55507ce3 | 1308 | mutex_unlock(&ctl->cache_writeout_mutex); |
5349d6c3 MX |
1309 | if (ret) |
1310 | goto out_nospc; | |
1311 | ||
1312 | /* Zero out the rest of the pages just to make sure */ | |
c9dc4c65 | 1313 | io_ctl_zero_remaining_pages(io_ctl); |
d4452bc5 | 1314 | |
5349d6c3 | 1315 | /* Everything is written out, now we dirty the pages in the file. */ |
2ff7e61e JM |
1316 | ret = btrfs_dirty_pages(inode, io_ctl->pages, io_ctl->num_pages, 0, |
1317 | i_size_read(inode), &cached_state); | |
5349d6c3 | 1318 | if (ret) |
d4452bc5 | 1319 | goto out_nospc; |
5349d6c3 | 1320 | |
e570fd27 MX |
1321 | if (block_group && (block_group->flags & BTRFS_BLOCK_GROUP_DATA)) |
1322 | up_write(&block_group->data_rwsem); | |
5349d6c3 MX |
1323 | /* |
1324 | * Release the pages and unlock the extent, we will flush | |
1325 | * them out later | |
1326 | */ | |
c9dc4c65 | 1327 | io_ctl_drop_pages(io_ctl); |
5349d6c3 MX |
1328 | |
1329 | unlock_extent_cached(&BTRFS_I(inode)->io_tree, 0, | |
1330 | i_size_read(inode) - 1, &cached_state, GFP_NOFS); | |
1331 | ||
c9dc4c65 CM |
1332 | /* |
1333 | * at this point the pages are under IO and we're happy, | |
1334 | * The caller is responsible for waiting on them and updating the | |
1335 | * the cache and the inode | |
1336 | */ | |
1337 | io_ctl->entries = entries; | |
1338 | io_ctl->bitmaps = bitmaps; | |
1339 | ||
1340 | ret = btrfs_fdatawrite_range(inode, 0, (u64)-1); | |
5349d6c3 | 1341 | if (ret) |
d4452bc5 CM |
1342 | goto out; |
1343 | ||
c9dc4c65 CM |
1344 | return 0; |
1345 | ||
2f356126 | 1346 | out: |
c9dc4c65 CM |
1347 | io_ctl->inode = NULL; |
1348 | io_ctl_free(io_ctl); | |
5349d6c3 | 1349 | if (ret) { |
a67509c3 | 1350 | invalidate_inode_pages2(inode->i_mapping); |
0cb59c99 JB |
1351 | BTRFS_I(inode)->generation = 0; |
1352 | } | |
0cb59c99 | 1353 | btrfs_update_inode(trans, root, inode); |
c9dc4c65 CM |
1354 | if (must_iput) |
1355 | iput(inode); | |
5349d6c3 | 1356 | return ret; |
a67509c3 | 1357 | |
a3bdccc4 CM |
1358 | out_nospc_locked: |
1359 | cleanup_bitmap_list(&bitmap_list); | |
1360 | spin_unlock(&ctl->tree_lock); | |
1361 | mutex_unlock(&ctl->cache_writeout_mutex); | |
1362 | ||
a67509c3 | 1363 | out_nospc: |
c9dc4c65 | 1364 | cleanup_write_cache_enospc(inode, io_ctl, &cached_state, &bitmap_list); |
e570fd27 MX |
1365 | |
1366 | if (block_group && (block_group->flags & BTRFS_BLOCK_GROUP_DATA)) | |
1367 | up_write(&block_group->data_rwsem); | |
1368 | ||
a67509c3 | 1369 | goto out; |
0414efae LZ |
1370 | } |
1371 | ||
5b4aacef | 1372 | int btrfs_write_out_cache(struct btrfs_fs_info *fs_info, |
0414efae LZ |
1373 | struct btrfs_trans_handle *trans, |
1374 | struct btrfs_block_group_cache *block_group, | |
1375 | struct btrfs_path *path) | |
1376 | { | |
5b4aacef | 1377 | struct btrfs_root *root = fs_info->tree_root; |
0414efae LZ |
1378 | struct btrfs_free_space_ctl *ctl = block_group->free_space_ctl; |
1379 | struct inode *inode; | |
1380 | int ret = 0; | |
1381 | ||
0414efae LZ |
1382 | spin_lock(&block_group->lock); |
1383 | if (block_group->disk_cache_state < BTRFS_DC_SETUP) { | |
1384 | spin_unlock(&block_group->lock); | |
e570fd27 MX |
1385 | return 0; |
1386 | } | |
0414efae LZ |
1387 | spin_unlock(&block_group->lock); |
1388 | ||
1389 | inode = lookup_free_space_inode(root, block_group, path); | |
1390 | if (IS_ERR(inode)) | |
1391 | return 0; | |
1392 | ||
c9dc4c65 CM |
1393 | ret = __btrfs_write_out_cache(root, inode, ctl, block_group, |
1394 | &block_group->io_ctl, trans, | |
0414efae | 1395 | path, block_group->key.objectid); |
c09544e0 | 1396 | if (ret) { |
c09544e0 | 1397 | #ifdef DEBUG |
0b246afa JM |
1398 | btrfs_err(fs_info, |
1399 | "failed to write free space cache for block group %llu", | |
1400 | block_group->key.objectid); | |
c09544e0 | 1401 | #endif |
c9dc4c65 CM |
1402 | spin_lock(&block_group->lock); |
1403 | block_group->disk_cache_state = BTRFS_DC_ERROR; | |
1404 | spin_unlock(&block_group->lock); | |
1405 | ||
1406 | block_group->io_ctl.inode = NULL; | |
1407 | iput(inode); | |
0414efae LZ |
1408 | } |
1409 | ||
c9dc4c65 CM |
1410 | /* |
1411 | * if ret == 0 the caller is expected to call btrfs_wait_cache_io | |
1412 | * to wait for IO and put the inode | |
1413 | */ | |
1414 | ||
0cb59c99 JB |
1415 | return ret; |
1416 | } | |
1417 | ||
34d52cb6 | 1418 | static inline unsigned long offset_to_bit(u64 bitmap_start, u32 unit, |
96303081 | 1419 | u64 offset) |
0f9dd46c | 1420 | { |
b12d6869 | 1421 | ASSERT(offset >= bitmap_start); |
96303081 | 1422 | offset -= bitmap_start; |
34d52cb6 | 1423 | return (unsigned long)(div_u64(offset, unit)); |
96303081 | 1424 | } |
0f9dd46c | 1425 | |
34d52cb6 | 1426 | static inline unsigned long bytes_to_bits(u64 bytes, u32 unit) |
96303081 | 1427 | { |
34d52cb6 | 1428 | return (unsigned long)(div_u64(bytes, unit)); |
96303081 | 1429 | } |
0f9dd46c | 1430 | |
34d52cb6 | 1431 | static inline u64 offset_to_bitmap(struct btrfs_free_space_ctl *ctl, |
96303081 JB |
1432 | u64 offset) |
1433 | { | |
1434 | u64 bitmap_start; | |
0ef6447a | 1435 | u64 bytes_per_bitmap; |
0f9dd46c | 1436 | |
34d52cb6 LZ |
1437 | bytes_per_bitmap = BITS_PER_BITMAP * ctl->unit; |
1438 | bitmap_start = offset - ctl->start; | |
0ef6447a | 1439 | bitmap_start = div64_u64(bitmap_start, bytes_per_bitmap); |
96303081 | 1440 | bitmap_start *= bytes_per_bitmap; |
34d52cb6 | 1441 | bitmap_start += ctl->start; |
0f9dd46c | 1442 | |
96303081 | 1443 | return bitmap_start; |
0f9dd46c JB |
1444 | } |
1445 | ||
96303081 JB |
1446 | static int tree_insert_offset(struct rb_root *root, u64 offset, |
1447 | struct rb_node *node, int bitmap) | |
0f9dd46c JB |
1448 | { |
1449 | struct rb_node **p = &root->rb_node; | |
1450 | struct rb_node *parent = NULL; | |
1451 | struct btrfs_free_space *info; | |
1452 | ||
1453 | while (*p) { | |
1454 | parent = *p; | |
96303081 | 1455 | info = rb_entry(parent, struct btrfs_free_space, offset_index); |
0f9dd46c | 1456 | |
96303081 | 1457 | if (offset < info->offset) { |
0f9dd46c | 1458 | p = &(*p)->rb_left; |
96303081 | 1459 | } else if (offset > info->offset) { |
0f9dd46c | 1460 | p = &(*p)->rb_right; |
96303081 JB |
1461 | } else { |
1462 | /* | |
1463 | * we could have a bitmap entry and an extent entry | |
1464 | * share the same offset. If this is the case, we want | |
1465 | * the extent entry to always be found first if we do a | |
1466 | * linear search through the tree, since we want to have | |
1467 | * the quickest allocation time, and allocating from an | |
1468 | * extent is faster than allocating from a bitmap. So | |
1469 | * if we're inserting a bitmap and we find an entry at | |
1470 | * this offset, we want to go right, or after this entry | |
1471 | * logically. If we are inserting an extent and we've | |
1472 | * found a bitmap, we want to go left, or before | |
1473 | * logically. | |
1474 | */ | |
1475 | if (bitmap) { | |
207dde82 JB |
1476 | if (info->bitmap) { |
1477 | WARN_ON_ONCE(1); | |
1478 | return -EEXIST; | |
1479 | } | |
96303081 JB |
1480 | p = &(*p)->rb_right; |
1481 | } else { | |
207dde82 JB |
1482 | if (!info->bitmap) { |
1483 | WARN_ON_ONCE(1); | |
1484 | return -EEXIST; | |
1485 | } | |
96303081 JB |
1486 | p = &(*p)->rb_left; |
1487 | } | |
1488 | } | |
0f9dd46c JB |
1489 | } |
1490 | ||
1491 | rb_link_node(node, parent, p); | |
1492 | rb_insert_color(node, root); | |
1493 | ||
1494 | return 0; | |
1495 | } | |
1496 | ||
1497 | /* | |
70cb0743 JB |
1498 | * searches the tree for the given offset. |
1499 | * | |
96303081 JB |
1500 | * fuzzy - If this is set, then we are trying to make an allocation, and we just |
1501 | * want a section that has at least bytes size and comes at or after the given | |
1502 | * offset. | |
0f9dd46c | 1503 | */ |
96303081 | 1504 | static struct btrfs_free_space * |
34d52cb6 | 1505 | tree_search_offset(struct btrfs_free_space_ctl *ctl, |
96303081 | 1506 | u64 offset, int bitmap_only, int fuzzy) |
0f9dd46c | 1507 | { |
34d52cb6 | 1508 | struct rb_node *n = ctl->free_space_offset.rb_node; |
96303081 JB |
1509 | struct btrfs_free_space *entry, *prev = NULL; |
1510 | ||
1511 | /* find entry that is closest to the 'offset' */ | |
1512 | while (1) { | |
1513 | if (!n) { | |
1514 | entry = NULL; | |
1515 | break; | |
1516 | } | |
0f9dd46c | 1517 | |
0f9dd46c | 1518 | entry = rb_entry(n, struct btrfs_free_space, offset_index); |
96303081 | 1519 | prev = entry; |
0f9dd46c | 1520 | |
96303081 | 1521 | if (offset < entry->offset) |
0f9dd46c | 1522 | n = n->rb_left; |
96303081 | 1523 | else if (offset > entry->offset) |
0f9dd46c | 1524 | n = n->rb_right; |
96303081 | 1525 | else |
0f9dd46c | 1526 | break; |
0f9dd46c JB |
1527 | } |
1528 | ||
96303081 JB |
1529 | if (bitmap_only) { |
1530 | if (!entry) | |
1531 | return NULL; | |
1532 | if (entry->bitmap) | |
1533 | return entry; | |
0f9dd46c | 1534 | |
96303081 JB |
1535 | /* |
1536 | * bitmap entry and extent entry may share same offset, | |
1537 | * in that case, bitmap entry comes after extent entry. | |
1538 | */ | |
1539 | n = rb_next(n); | |
1540 | if (!n) | |
1541 | return NULL; | |
1542 | entry = rb_entry(n, struct btrfs_free_space, offset_index); | |
1543 | if (entry->offset != offset) | |
1544 | return NULL; | |
0f9dd46c | 1545 | |
96303081 JB |
1546 | WARN_ON(!entry->bitmap); |
1547 | return entry; | |
1548 | } else if (entry) { | |
1549 | if (entry->bitmap) { | |
0f9dd46c | 1550 | /* |
96303081 JB |
1551 | * if previous extent entry covers the offset, |
1552 | * we should return it instead of the bitmap entry | |
0f9dd46c | 1553 | */ |
de6c4115 MX |
1554 | n = rb_prev(&entry->offset_index); |
1555 | if (n) { | |
96303081 JB |
1556 | prev = rb_entry(n, struct btrfs_free_space, |
1557 | offset_index); | |
de6c4115 MX |
1558 | if (!prev->bitmap && |
1559 | prev->offset + prev->bytes > offset) | |
1560 | entry = prev; | |
0f9dd46c | 1561 | } |
96303081 JB |
1562 | } |
1563 | return entry; | |
1564 | } | |
1565 | ||
1566 | if (!prev) | |
1567 | return NULL; | |
1568 | ||
1569 | /* find last entry before the 'offset' */ | |
1570 | entry = prev; | |
1571 | if (entry->offset > offset) { | |
1572 | n = rb_prev(&entry->offset_index); | |
1573 | if (n) { | |
1574 | entry = rb_entry(n, struct btrfs_free_space, | |
1575 | offset_index); | |
b12d6869 | 1576 | ASSERT(entry->offset <= offset); |
0f9dd46c | 1577 | } else { |
96303081 JB |
1578 | if (fuzzy) |
1579 | return entry; | |
1580 | else | |
1581 | return NULL; | |
0f9dd46c JB |
1582 | } |
1583 | } | |
1584 | ||
96303081 | 1585 | if (entry->bitmap) { |
de6c4115 MX |
1586 | n = rb_prev(&entry->offset_index); |
1587 | if (n) { | |
96303081 JB |
1588 | prev = rb_entry(n, struct btrfs_free_space, |
1589 | offset_index); | |
de6c4115 MX |
1590 | if (!prev->bitmap && |
1591 | prev->offset + prev->bytes > offset) | |
1592 | return prev; | |
96303081 | 1593 | } |
34d52cb6 | 1594 | if (entry->offset + BITS_PER_BITMAP * ctl->unit > offset) |
96303081 JB |
1595 | return entry; |
1596 | } else if (entry->offset + entry->bytes > offset) | |
1597 | return entry; | |
1598 | ||
1599 | if (!fuzzy) | |
1600 | return NULL; | |
1601 | ||
1602 | while (1) { | |
1603 | if (entry->bitmap) { | |
1604 | if (entry->offset + BITS_PER_BITMAP * | |
34d52cb6 | 1605 | ctl->unit > offset) |
96303081 JB |
1606 | break; |
1607 | } else { | |
1608 | if (entry->offset + entry->bytes > offset) | |
1609 | break; | |
1610 | } | |
1611 | ||
1612 | n = rb_next(&entry->offset_index); | |
1613 | if (!n) | |
1614 | return NULL; | |
1615 | entry = rb_entry(n, struct btrfs_free_space, offset_index); | |
1616 | } | |
1617 | return entry; | |
0f9dd46c JB |
1618 | } |
1619 | ||
f333adb5 | 1620 | static inline void |
34d52cb6 | 1621 | __unlink_free_space(struct btrfs_free_space_ctl *ctl, |
f333adb5 | 1622 | struct btrfs_free_space *info) |
0f9dd46c | 1623 | { |
34d52cb6 LZ |
1624 | rb_erase(&info->offset_index, &ctl->free_space_offset); |
1625 | ctl->free_extents--; | |
f333adb5 LZ |
1626 | } |
1627 | ||
34d52cb6 | 1628 | static void unlink_free_space(struct btrfs_free_space_ctl *ctl, |
f333adb5 LZ |
1629 | struct btrfs_free_space *info) |
1630 | { | |
34d52cb6 LZ |
1631 | __unlink_free_space(ctl, info); |
1632 | ctl->free_space -= info->bytes; | |
0f9dd46c JB |
1633 | } |
1634 | ||
34d52cb6 | 1635 | static int link_free_space(struct btrfs_free_space_ctl *ctl, |
0f9dd46c JB |
1636 | struct btrfs_free_space *info) |
1637 | { | |
1638 | int ret = 0; | |
1639 | ||
b12d6869 | 1640 | ASSERT(info->bytes || info->bitmap); |
34d52cb6 | 1641 | ret = tree_insert_offset(&ctl->free_space_offset, info->offset, |
96303081 | 1642 | &info->offset_index, (info->bitmap != NULL)); |
0f9dd46c JB |
1643 | if (ret) |
1644 | return ret; | |
1645 | ||
34d52cb6 LZ |
1646 | ctl->free_space += info->bytes; |
1647 | ctl->free_extents++; | |
96303081 JB |
1648 | return ret; |
1649 | } | |
1650 | ||
34d52cb6 | 1651 | static void recalculate_thresholds(struct btrfs_free_space_ctl *ctl) |
96303081 | 1652 | { |
34d52cb6 | 1653 | struct btrfs_block_group_cache *block_group = ctl->private; |
25891f79 JB |
1654 | u64 max_bytes; |
1655 | u64 bitmap_bytes; | |
1656 | u64 extent_bytes; | |
8eb2d829 | 1657 | u64 size = block_group->key.offset; |
0ef6447a FX |
1658 | u64 bytes_per_bg = BITS_PER_BITMAP * ctl->unit; |
1659 | u64 max_bitmaps = div64_u64(size + bytes_per_bg - 1, bytes_per_bg); | |
34d52cb6 | 1660 | |
0ef6447a | 1661 | max_bitmaps = max_t(u64, max_bitmaps, 1); |
dde5740f | 1662 | |
b12d6869 | 1663 | ASSERT(ctl->total_bitmaps <= max_bitmaps); |
96303081 JB |
1664 | |
1665 | /* | |
1666 | * The goal is to keep the total amount of memory used per 1gb of space | |
1667 | * at or below 32k, so we need to adjust how much memory we allow to be | |
1668 | * used by extent based free space tracking | |
1669 | */ | |
ee22184b | 1670 | if (size < SZ_1G) |
8eb2d829 LZ |
1671 | max_bytes = MAX_CACHE_BYTES_PER_GIG; |
1672 | else | |
ee22184b | 1673 | max_bytes = MAX_CACHE_BYTES_PER_GIG * div_u64(size, SZ_1G); |
96303081 | 1674 | |
25891f79 JB |
1675 | /* |
1676 | * we want to account for 1 more bitmap than what we have so we can make | |
1677 | * sure we don't go over our overall goal of MAX_CACHE_BYTES_PER_GIG as | |
1678 | * we add more bitmaps. | |
1679 | */ | |
b9ef22de | 1680 | bitmap_bytes = (ctl->total_bitmaps + 1) * ctl->unit; |
96303081 | 1681 | |
25891f79 | 1682 | if (bitmap_bytes >= max_bytes) { |
34d52cb6 | 1683 | ctl->extents_thresh = 0; |
25891f79 JB |
1684 | return; |
1685 | } | |
96303081 | 1686 | |
25891f79 | 1687 | /* |
f8c269d7 | 1688 | * we want the extent entry threshold to always be at most 1/2 the max |
25891f79 JB |
1689 | * bytes we can have, or whatever is less than that. |
1690 | */ | |
1691 | extent_bytes = max_bytes - bitmap_bytes; | |
f8c269d7 | 1692 | extent_bytes = min_t(u64, extent_bytes, max_bytes >> 1); |
96303081 | 1693 | |
34d52cb6 | 1694 | ctl->extents_thresh = |
f8c269d7 | 1695 | div_u64(extent_bytes, sizeof(struct btrfs_free_space)); |
96303081 JB |
1696 | } |
1697 | ||
bb3ac5a4 MX |
1698 | static inline void __bitmap_clear_bits(struct btrfs_free_space_ctl *ctl, |
1699 | struct btrfs_free_space *info, | |
1700 | u64 offset, u64 bytes) | |
96303081 | 1701 | { |
f38b6e75 | 1702 | unsigned long start, count; |
96303081 | 1703 | |
34d52cb6 LZ |
1704 | start = offset_to_bit(info->offset, ctl->unit, offset); |
1705 | count = bytes_to_bits(bytes, ctl->unit); | |
b12d6869 | 1706 | ASSERT(start + count <= BITS_PER_BITMAP); |
96303081 | 1707 | |
f38b6e75 | 1708 | bitmap_clear(info->bitmap, start, count); |
96303081 JB |
1709 | |
1710 | info->bytes -= bytes; | |
bb3ac5a4 MX |
1711 | } |
1712 | ||
1713 | static void bitmap_clear_bits(struct btrfs_free_space_ctl *ctl, | |
1714 | struct btrfs_free_space *info, u64 offset, | |
1715 | u64 bytes) | |
1716 | { | |
1717 | __bitmap_clear_bits(ctl, info, offset, bytes); | |
34d52cb6 | 1718 | ctl->free_space -= bytes; |
96303081 JB |
1719 | } |
1720 | ||
34d52cb6 | 1721 | static void bitmap_set_bits(struct btrfs_free_space_ctl *ctl, |
817d52f8 JB |
1722 | struct btrfs_free_space *info, u64 offset, |
1723 | u64 bytes) | |
96303081 | 1724 | { |
f38b6e75 | 1725 | unsigned long start, count; |
96303081 | 1726 | |
34d52cb6 LZ |
1727 | start = offset_to_bit(info->offset, ctl->unit, offset); |
1728 | count = bytes_to_bits(bytes, ctl->unit); | |
b12d6869 | 1729 | ASSERT(start + count <= BITS_PER_BITMAP); |
96303081 | 1730 | |
f38b6e75 | 1731 | bitmap_set(info->bitmap, start, count); |
96303081 JB |
1732 | |
1733 | info->bytes += bytes; | |
34d52cb6 | 1734 | ctl->free_space += bytes; |
96303081 JB |
1735 | } |
1736 | ||
a4820398 MX |
1737 | /* |
1738 | * If we can not find suitable extent, we will use bytes to record | |
1739 | * the size of the max extent. | |
1740 | */ | |
34d52cb6 | 1741 | static int search_bitmap(struct btrfs_free_space_ctl *ctl, |
96303081 | 1742 | struct btrfs_free_space *bitmap_info, u64 *offset, |
0584f718 | 1743 | u64 *bytes, bool for_alloc) |
96303081 JB |
1744 | { |
1745 | unsigned long found_bits = 0; | |
a4820398 | 1746 | unsigned long max_bits = 0; |
96303081 JB |
1747 | unsigned long bits, i; |
1748 | unsigned long next_zero; | |
a4820398 | 1749 | unsigned long extent_bits; |
96303081 | 1750 | |
cef40483 JB |
1751 | /* |
1752 | * Skip searching the bitmap if we don't have a contiguous section that | |
1753 | * is large enough for this allocation. | |
1754 | */ | |
0584f718 JB |
1755 | if (for_alloc && |
1756 | bitmap_info->max_extent_size && | |
cef40483 JB |
1757 | bitmap_info->max_extent_size < *bytes) { |
1758 | *bytes = bitmap_info->max_extent_size; | |
1759 | return -1; | |
1760 | } | |
1761 | ||
34d52cb6 | 1762 | i = offset_to_bit(bitmap_info->offset, ctl->unit, |
96303081 | 1763 | max_t(u64, *offset, bitmap_info->offset)); |
34d52cb6 | 1764 | bits = bytes_to_bits(*bytes, ctl->unit); |
96303081 | 1765 | |
ebb3dad4 | 1766 | for_each_set_bit_from(i, bitmap_info->bitmap, BITS_PER_BITMAP) { |
0584f718 JB |
1767 | if (for_alloc && bits == 1) { |
1768 | found_bits = 1; | |
1769 | break; | |
1770 | } | |
96303081 JB |
1771 | next_zero = find_next_zero_bit(bitmap_info->bitmap, |
1772 | BITS_PER_BITMAP, i); | |
a4820398 MX |
1773 | extent_bits = next_zero - i; |
1774 | if (extent_bits >= bits) { | |
1775 | found_bits = extent_bits; | |
96303081 | 1776 | break; |
a4820398 MX |
1777 | } else if (extent_bits > max_bits) { |
1778 | max_bits = extent_bits; | |
96303081 JB |
1779 | } |
1780 | i = next_zero; | |
1781 | } | |
1782 | ||
1783 | if (found_bits) { | |
34d52cb6 LZ |
1784 | *offset = (u64)(i * ctl->unit) + bitmap_info->offset; |
1785 | *bytes = (u64)(found_bits) * ctl->unit; | |
96303081 JB |
1786 | return 0; |
1787 | } | |
1788 | ||
a4820398 | 1789 | *bytes = (u64)(max_bits) * ctl->unit; |
cef40483 | 1790 | bitmap_info->max_extent_size = *bytes; |
96303081 JB |
1791 | return -1; |
1792 | } | |
1793 | ||
a4820398 | 1794 | /* Cache the size of the max extent in bytes */ |
34d52cb6 | 1795 | static struct btrfs_free_space * |
53b381b3 | 1796 | find_free_space(struct btrfs_free_space_ctl *ctl, u64 *offset, u64 *bytes, |
a4820398 | 1797 | unsigned long align, u64 *max_extent_size) |
96303081 JB |
1798 | { |
1799 | struct btrfs_free_space *entry; | |
1800 | struct rb_node *node; | |
53b381b3 DW |
1801 | u64 tmp; |
1802 | u64 align_off; | |
96303081 JB |
1803 | int ret; |
1804 | ||
34d52cb6 | 1805 | if (!ctl->free_space_offset.rb_node) |
a4820398 | 1806 | goto out; |
96303081 | 1807 | |
34d52cb6 | 1808 | entry = tree_search_offset(ctl, offset_to_bitmap(ctl, *offset), 0, 1); |
96303081 | 1809 | if (!entry) |
a4820398 | 1810 | goto out; |
96303081 JB |
1811 | |
1812 | for (node = &entry->offset_index; node; node = rb_next(node)) { | |
1813 | entry = rb_entry(node, struct btrfs_free_space, offset_index); | |
a4820398 MX |
1814 | if (entry->bytes < *bytes) { |
1815 | if (entry->bytes > *max_extent_size) | |
1816 | *max_extent_size = entry->bytes; | |
96303081 | 1817 | continue; |
a4820398 | 1818 | } |
96303081 | 1819 | |
53b381b3 DW |
1820 | /* make sure the space returned is big enough |
1821 | * to match our requested alignment | |
1822 | */ | |
1823 | if (*bytes >= align) { | |
a4820398 | 1824 | tmp = entry->offset - ctl->start + align - 1; |
47c5713f | 1825 | tmp = div64_u64(tmp, align); |
53b381b3 DW |
1826 | tmp = tmp * align + ctl->start; |
1827 | align_off = tmp - entry->offset; | |
1828 | } else { | |
1829 | align_off = 0; | |
1830 | tmp = entry->offset; | |
1831 | } | |
1832 | ||
a4820398 MX |
1833 | if (entry->bytes < *bytes + align_off) { |
1834 | if (entry->bytes > *max_extent_size) | |
1835 | *max_extent_size = entry->bytes; | |
53b381b3 | 1836 | continue; |
a4820398 | 1837 | } |
53b381b3 | 1838 | |
96303081 | 1839 | if (entry->bitmap) { |
a4820398 MX |
1840 | u64 size = *bytes; |
1841 | ||
0584f718 | 1842 | ret = search_bitmap(ctl, entry, &tmp, &size, true); |
53b381b3 DW |
1843 | if (!ret) { |
1844 | *offset = tmp; | |
a4820398 | 1845 | *bytes = size; |
96303081 | 1846 | return entry; |
a4820398 MX |
1847 | } else if (size > *max_extent_size) { |
1848 | *max_extent_size = size; | |
53b381b3 | 1849 | } |
96303081 JB |
1850 | continue; |
1851 | } | |
1852 | ||
53b381b3 DW |
1853 | *offset = tmp; |
1854 | *bytes = entry->bytes - align_off; | |
96303081 JB |
1855 | return entry; |
1856 | } | |
a4820398 | 1857 | out: |
96303081 JB |
1858 | return NULL; |
1859 | } | |
1860 | ||
34d52cb6 | 1861 | static void add_new_bitmap(struct btrfs_free_space_ctl *ctl, |
96303081 JB |
1862 | struct btrfs_free_space *info, u64 offset) |
1863 | { | |
34d52cb6 | 1864 | info->offset = offset_to_bitmap(ctl, offset); |
f019f426 | 1865 | info->bytes = 0; |
f2d0f676 | 1866 | INIT_LIST_HEAD(&info->list); |
34d52cb6 LZ |
1867 | link_free_space(ctl, info); |
1868 | ctl->total_bitmaps++; | |
96303081 | 1869 | |
34d52cb6 | 1870 | ctl->op->recalc_thresholds(ctl); |
96303081 JB |
1871 | } |
1872 | ||
34d52cb6 | 1873 | static void free_bitmap(struct btrfs_free_space_ctl *ctl, |
edf6e2d1 LZ |
1874 | struct btrfs_free_space *bitmap_info) |
1875 | { | |
34d52cb6 | 1876 | unlink_free_space(ctl, bitmap_info); |
edf6e2d1 | 1877 | kfree(bitmap_info->bitmap); |
dc89e982 | 1878 | kmem_cache_free(btrfs_free_space_cachep, bitmap_info); |
34d52cb6 LZ |
1879 | ctl->total_bitmaps--; |
1880 | ctl->op->recalc_thresholds(ctl); | |
edf6e2d1 LZ |
1881 | } |
1882 | ||
34d52cb6 | 1883 | static noinline int remove_from_bitmap(struct btrfs_free_space_ctl *ctl, |
96303081 JB |
1884 | struct btrfs_free_space *bitmap_info, |
1885 | u64 *offset, u64 *bytes) | |
1886 | { | |
1887 | u64 end; | |
6606bb97 JB |
1888 | u64 search_start, search_bytes; |
1889 | int ret; | |
96303081 JB |
1890 | |
1891 | again: | |
34d52cb6 | 1892 | end = bitmap_info->offset + (u64)(BITS_PER_BITMAP * ctl->unit) - 1; |
96303081 | 1893 | |
6606bb97 | 1894 | /* |
bdb7d303 JB |
1895 | * We need to search for bits in this bitmap. We could only cover some |
1896 | * of the extent in this bitmap thanks to how we add space, so we need | |
1897 | * to search for as much as it as we can and clear that amount, and then | |
1898 | * go searching for the next bit. | |
6606bb97 JB |
1899 | */ |
1900 | search_start = *offset; | |
bdb7d303 | 1901 | search_bytes = ctl->unit; |
13dbc089 | 1902 | search_bytes = min(search_bytes, end - search_start + 1); |
0584f718 JB |
1903 | ret = search_bitmap(ctl, bitmap_info, &search_start, &search_bytes, |
1904 | false); | |
b50c6e25 JB |
1905 | if (ret < 0 || search_start != *offset) |
1906 | return -EINVAL; | |
6606bb97 | 1907 | |
bdb7d303 JB |
1908 | /* We may have found more bits than what we need */ |
1909 | search_bytes = min(search_bytes, *bytes); | |
1910 | ||
1911 | /* Cannot clear past the end of the bitmap */ | |
1912 | search_bytes = min(search_bytes, end - search_start + 1); | |
1913 | ||
1914 | bitmap_clear_bits(ctl, bitmap_info, search_start, search_bytes); | |
1915 | *offset += search_bytes; | |
1916 | *bytes -= search_bytes; | |
96303081 JB |
1917 | |
1918 | if (*bytes) { | |
6606bb97 | 1919 | struct rb_node *next = rb_next(&bitmap_info->offset_index); |
edf6e2d1 | 1920 | if (!bitmap_info->bytes) |
34d52cb6 | 1921 | free_bitmap(ctl, bitmap_info); |
96303081 | 1922 | |
6606bb97 JB |
1923 | /* |
1924 | * no entry after this bitmap, but we still have bytes to | |
1925 | * remove, so something has gone wrong. | |
1926 | */ | |
1927 | if (!next) | |
96303081 JB |
1928 | return -EINVAL; |
1929 | ||
6606bb97 JB |
1930 | bitmap_info = rb_entry(next, struct btrfs_free_space, |
1931 | offset_index); | |
1932 | ||
1933 | /* | |
1934 | * if the next entry isn't a bitmap we need to return to let the | |
1935 | * extent stuff do its work. | |
1936 | */ | |
96303081 JB |
1937 | if (!bitmap_info->bitmap) |
1938 | return -EAGAIN; | |
1939 | ||
6606bb97 JB |
1940 | /* |
1941 | * Ok the next item is a bitmap, but it may not actually hold | |
1942 | * the information for the rest of this free space stuff, so | |
1943 | * look for it, and if we don't find it return so we can try | |
1944 | * everything over again. | |
1945 | */ | |
1946 | search_start = *offset; | |
bdb7d303 | 1947 | search_bytes = ctl->unit; |
34d52cb6 | 1948 | ret = search_bitmap(ctl, bitmap_info, &search_start, |
0584f718 | 1949 | &search_bytes, false); |
6606bb97 JB |
1950 | if (ret < 0 || search_start != *offset) |
1951 | return -EAGAIN; | |
1952 | ||
96303081 | 1953 | goto again; |
edf6e2d1 | 1954 | } else if (!bitmap_info->bytes) |
34d52cb6 | 1955 | free_bitmap(ctl, bitmap_info); |
96303081 JB |
1956 | |
1957 | return 0; | |
1958 | } | |
1959 | ||
2cdc342c JB |
1960 | static u64 add_bytes_to_bitmap(struct btrfs_free_space_ctl *ctl, |
1961 | struct btrfs_free_space *info, u64 offset, | |
1962 | u64 bytes) | |
1963 | { | |
1964 | u64 bytes_to_set = 0; | |
1965 | u64 end; | |
1966 | ||
1967 | end = info->offset + (u64)(BITS_PER_BITMAP * ctl->unit); | |
1968 | ||
1969 | bytes_to_set = min(end - offset, bytes); | |
1970 | ||
1971 | bitmap_set_bits(ctl, info, offset, bytes_to_set); | |
1972 | ||
cef40483 JB |
1973 | /* |
1974 | * We set some bytes, we have no idea what the max extent size is | |
1975 | * anymore. | |
1976 | */ | |
1977 | info->max_extent_size = 0; | |
1978 | ||
2cdc342c JB |
1979 | return bytes_to_set; |
1980 | ||
1981 | } | |
1982 | ||
34d52cb6 LZ |
1983 | static bool use_bitmap(struct btrfs_free_space_ctl *ctl, |
1984 | struct btrfs_free_space *info) | |
96303081 | 1985 | { |
34d52cb6 | 1986 | struct btrfs_block_group_cache *block_group = ctl->private; |
0b246afa | 1987 | struct btrfs_fs_info *fs_info = block_group->fs_info; |
d0bd4560 JB |
1988 | bool forced = false; |
1989 | ||
1990 | #ifdef CONFIG_BTRFS_DEBUG | |
2ff7e61e | 1991 | if (btrfs_should_fragment_free_space(block_group)) |
d0bd4560 JB |
1992 | forced = true; |
1993 | #endif | |
96303081 JB |
1994 | |
1995 | /* | |
1996 | * If we are below the extents threshold then we can add this as an | |
1997 | * extent, and don't have to deal with the bitmap | |
1998 | */ | |
d0bd4560 | 1999 | if (!forced && ctl->free_extents < ctl->extents_thresh) { |
32cb0840 JB |
2000 | /* |
2001 | * If this block group has some small extents we don't want to | |
2002 | * use up all of our free slots in the cache with them, we want | |
01327610 | 2003 | * to reserve them to larger extents, however if we have plenty |
32cb0840 JB |
2004 | * of cache left then go ahead an dadd them, no sense in adding |
2005 | * the overhead of a bitmap if we don't have to. | |
2006 | */ | |
0b246afa | 2007 | if (info->bytes <= fs_info->sectorsize * 4) { |
34d52cb6 LZ |
2008 | if (ctl->free_extents * 2 <= ctl->extents_thresh) |
2009 | return false; | |
32cb0840 | 2010 | } else { |
34d52cb6 | 2011 | return false; |
32cb0840 JB |
2012 | } |
2013 | } | |
96303081 JB |
2014 | |
2015 | /* | |
dde5740f JB |
2016 | * The original block groups from mkfs can be really small, like 8 |
2017 | * megabytes, so don't bother with a bitmap for those entries. However | |
2018 | * some block groups can be smaller than what a bitmap would cover but | |
2019 | * are still large enough that they could overflow the 32k memory limit, | |
2020 | * so allow those block groups to still be allowed to have a bitmap | |
2021 | * entry. | |
96303081 | 2022 | */ |
dde5740f | 2023 | if (((BITS_PER_BITMAP * ctl->unit) >> 1) > block_group->key.offset) |
34d52cb6 LZ |
2024 | return false; |
2025 | ||
2026 | return true; | |
2027 | } | |
2028 | ||
20e5506b | 2029 | static const struct btrfs_free_space_op free_space_op = { |
2cdc342c JB |
2030 | .recalc_thresholds = recalculate_thresholds, |
2031 | .use_bitmap = use_bitmap, | |
2032 | }; | |
2033 | ||
34d52cb6 LZ |
2034 | static int insert_into_bitmap(struct btrfs_free_space_ctl *ctl, |
2035 | struct btrfs_free_space *info) | |
2036 | { | |
2037 | struct btrfs_free_space *bitmap_info; | |
2cdc342c | 2038 | struct btrfs_block_group_cache *block_group = NULL; |
34d52cb6 | 2039 | int added = 0; |
2cdc342c | 2040 | u64 bytes, offset, bytes_added; |
34d52cb6 | 2041 | int ret; |
96303081 JB |
2042 | |
2043 | bytes = info->bytes; | |
2044 | offset = info->offset; | |
2045 | ||
34d52cb6 LZ |
2046 | if (!ctl->op->use_bitmap(ctl, info)) |
2047 | return 0; | |
2048 | ||
2cdc342c JB |
2049 | if (ctl->op == &free_space_op) |
2050 | block_group = ctl->private; | |
38e87880 | 2051 | again: |
2cdc342c JB |
2052 | /* |
2053 | * Since we link bitmaps right into the cluster we need to see if we | |
2054 | * have a cluster here, and if so and it has our bitmap we need to add | |
2055 | * the free space to that bitmap. | |
2056 | */ | |
2057 | if (block_group && !list_empty(&block_group->cluster_list)) { | |
2058 | struct btrfs_free_cluster *cluster; | |
2059 | struct rb_node *node; | |
2060 | struct btrfs_free_space *entry; | |
2061 | ||
2062 | cluster = list_entry(block_group->cluster_list.next, | |
2063 | struct btrfs_free_cluster, | |
2064 | block_group_list); | |
2065 | spin_lock(&cluster->lock); | |
2066 | node = rb_first(&cluster->root); | |
2067 | if (!node) { | |
2068 | spin_unlock(&cluster->lock); | |
38e87880 | 2069 | goto no_cluster_bitmap; |
2cdc342c JB |
2070 | } |
2071 | ||
2072 | entry = rb_entry(node, struct btrfs_free_space, offset_index); | |
2073 | if (!entry->bitmap) { | |
2074 | spin_unlock(&cluster->lock); | |
38e87880 | 2075 | goto no_cluster_bitmap; |
2cdc342c JB |
2076 | } |
2077 | ||
2078 | if (entry->offset == offset_to_bitmap(ctl, offset)) { | |
2079 | bytes_added = add_bytes_to_bitmap(ctl, entry, | |
2080 | offset, bytes); | |
2081 | bytes -= bytes_added; | |
2082 | offset += bytes_added; | |
2083 | } | |
2084 | spin_unlock(&cluster->lock); | |
2085 | if (!bytes) { | |
2086 | ret = 1; | |
2087 | goto out; | |
2088 | } | |
2089 | } | |
38e87880 CM |
2090 | |
2091 | no_cluster_bitmap: | |
34d52cb6 | 2092 | bitmap_info = tree_search_offset(ctl, offset_to_bitmap(ctl, offset), |
96303081 JB |
2093 | 1, 0); |
2094 | if (!bitmap_info) { | |
b12d6869 | 2095 | ASSERT(added == 0); |
96303081 JB |
2096 | goto new_bitmap; |
2097 | } | |
2098 | ||
2cdc342c JB |
2099 | bytes_added = add_bytes_to_bitmap(ctl, bitmap_info, offset, bytes); |
2100 | bytes -= bytes_added; | |
2101 | offset += bytes_added; | |
2102 | added = 0; | |
96303081 JB |
2103 | |
2104 | if (!bytes) { | |
2105 | ret = 1; | |
2106 | goto out; | |
2107 | } else | |
2108 | goto again; | |
2109 | ||
2110 | new_bitmap: | |
2111 | if (info && info->bitmap) { | |
34d52cb6 | 2112 | add_new_bitmap(ctl, info, offset); |
96303081 JB |
2113 | added = 1; |
2114 | info = NULL; | |
2115 | goto again; | |
2116 | } else { | |
34d52cb6 | 2117 | spin_unlock(&ctl->tree_lock); |
96303081 JB |
2118 | |
2119 | /* no pre-allocated info, allocate a new one */ | |
2120 | if (!info) { | |
dc89e982 JB |
2121 | info = kmem_cache_zalloc(btrfs_free_space_cachep, |
2122 | GFP_NOFS); | |
96303081 | 2123 | if (!info) { |
34d52cb6 | 2124 | spin_lock(&ctl->tree_lock); |
96303081 JB |
2125 | ret = -ENOMEM; |
2126 | goto out; | |
2127 | } | |
2128 | } | |
2129 | ||
2130 | /* allocate the bitmap */ | |
09cbfeaf | 2131 | info->bitmap = kzalloc(PAGE_SIZE, GFP_NOFS); |
34d52cb6 | 2132 | spin_lock(&ctl->tree_lock); |
96303081 JB |
2133 | if (!info->bitmap) { |
2134 | ret = -ENOMEM; | |
2135 | goto out; | |
2136 | } | |
2137 | goto again; | |
2138 | } | |
2139 | ||
2140 | out: | |
2141 | if (info) { | |
2142 | if (info->bitmap) | |
2143 | kfree(info->bitmap); | |
dc89e982 | 2144 | kmem_cache_free(btrfs_free_space_cachep, info); |
96303081 | 2145 | } |
0f9dd46c JB |
2146 | |
2147 | return ret; | |
2148 | } | |
2149 | ||
945d8962 | 2150 | static bool try_merge_free_space(struct btrfs_free_space_ctl *ctl, |
f333adb5 | 2151 | struct btrfs_free_space *info, bool update_stat) |
0f9dd46c | 2152 | { |
120d66ee LZ |
2153 | struct btrfs_free_space *left_info; |
2154 | struct btrfs_free_space *right_info; | |
2155 | bool merged = false; | |
2156 | u64 offset = info->offset; | |
2157 | u64 bytes = info->bytes; | |
6226cb0a | 2158 | |
0f9dd46c JB |
2159 | /* |
2160 | * first we want to see if there is free space adjacent to the range we | |
2161 | * are adding, if there is remove that struct and add a new one to | |
2162 | * cover the entire range | |
2163 | */ | |
34d52cb6 | 2164 | right_info = tree_search_offset(ctl, offset + bytes, 0, 0); |
96303081 JB |
2165 | if (right_info && rb_prev(&right_info->offset_index)) |
2166 | left_info = rb_entry(rb_prev(&right_info->offset_index), | |
2167 | struct btrfs_free_space, offset_index); | |
2168 | else | |
34d52cb6 | 2169 | left_info = tree_search_offset(ctl, offset - 1, 0, 0); |
0f9dd46c | 2170 | |
96303081 | 2171 | if (right_info && !right_info->bitmap) { |
f333adb5 | 2172 | if (update_stat) |
34d52cb6 | 2173 | unlink_free_space(ctl, right_info); |
f333adb5 | 2174 | else |
34d52cb6 | 2175 | __unlink_free_space(ctl, right_info); |
6226cb0a | 2176 | info->bytes += right_info->bytes; |
dc89e982 | 2177 | kmem_cache_free(btrfs_free_space_cachep, right_info); |
120d66ee | 2178 | merged = true; |
0f9dd46c JB |
2179 | } |
2180 | ||
96303081 JB |
2181 | if (left_info && !left_info->bitmap && |
2182 | left_info->offset + left_info->bytes == offset) { | |
f333adb5 | 2183 | if (update_stat) |
34d52cb6 | 2184 | unlink_free_space(ctl, left_info); |
f333adb5 | 2185 | else |
34d52cb6 | 2186 | __unlink_free_space(ctl, left_info); |
6226cb0a JB |
2187 | info->offset = left_info->offset; |
2188 | info->bytes += left_info->bytes; | |
dc89e982 | 2189 | kmem_cache_free(btrfs_free_space_cachep, left_info); |
120d66ee | 2190 | merged = true; |
0f9dd46c JB |
2191 | } |
2192 | ||
120d66ee LZ |
2193 | return merged; |
2194 | } | |
2195 | ||
20005523 FM |
2196 | static bool steal_from_bitmap_to_end(struct btrfs_free_space_ctl *ctl, |
2197 | struct btrfs_free_space *info, | |
2198 | bool update_stat) | |
2199 | { | |
2200 | struct btrfs_free_space *bitmap; | |
2201 | unsigned long i; | |
2202 | unsigned long j; | |
2203 | const u64 end = info->offset + info->bytes; | |
2204 | const u64 bitmap_offset = offset_to_bitmap(ctl, end); | |
2205 | u64 bytes; | |
2206 | ||
2207 | bitmap = tree_search_offset(ctl, bitmap_offset, 1, 0); | |
2208 | if (!bitmap) | |
2209 | return false; | |
2210 | ||
2211 | i = offset_to_bit(bitmap->offset, ctl->unit, end); | |
2212 | j = find_next_zero_bit(bitmap->bitmap, BITS_PER_BITMAP, i); | |
2213 | if (j == i) | |
2214 | return false; | |
2215 | bytes = (j - i) * ctl->unit; | |
2216 | info->bytes += bytes; | |
2217 | ||
2218 | if (update_stat) | |
2219 | bitmap_clear_bits(ctl, bitmap, end, bytes); | |
2220 | else | |
2221 | __bitmap_clear_bits(ctl, bitmap, end, bytes); | |
2222 | ||
2223 | if (!bitmap->bytes) | |
2224 | free_bitmap(ctl, bitmap); | |
2225 | ||
2226 | return true; | |
2227 | } | |
2228 | ||
2229 | static bool steal_from_bitmap_to_front(struct btrfs_free_space_ctl *ctl, | |
2230 | struct btrfs_free_space *info, | |
2231 | bool update_stat) | |
2232 | { | |
2233 | struct btrfs_free_space *bitmap; | |
2234 | u64 bitmap_offset; | |
2235 | unsigned long i; | |
2236 | unsigned long j; | |
2237 | unsigned long prev_j; | |
2238 | u64 bytes; | |
2239 | ||
2240 | bitmap_offset = offset_to_bitmap(ctl, info->offset); | |
2241 | /* If we're on a boundary, try the previous logical bitmap. */ | |
2242 | if (bitmap_offset == info->offset) { | |
2243 | if (info->offset == 0) | |
2244 | return false; | |
2245 | bitmap_offset = offset_to_bitmap(ctl, info->offset - 1); | |
2246 | } | |
2247 | ||
2248 | bitmap = tree_search_offset(ctl, bitmap_offset, 1, 0); | |
2249 | if (!bitmap) | |
2250 | return false; | |
2251 | ||
2252 | i = offset_to_bit(bitmap->offset, ctl->unit, info->offset) - 1; | |
2253 | j = 0; | |
2254 | prev_j = (unsigned long)-1; | |
2255 | for_each_clear_bit_from(j, bitmap->bitmap, BITS_PER_BITMAP) { | |
2256 | if (j > i) | |
2257 | break; | |
2258 | prev_j = j; | |
2259 | } | |
2260 | if (prev_j == i) | |
2261 | return false; | |
2262 | ||
2263 | if (prev_j == (unsigned long)-1) | |
2264 | bytes = (i + 1) * ctl->unit; | |
2265 | else | |
2266 | bytes = (i - prev_j) * ctl->unit; | |
2267 | ||
2268 | info->offset -= bytes; | |
2269 | info->bytes += bytes; | |
2270 | ||
2271 | if (update_stat) | |
2272 | bitmap_clear_bits(ctl, bitmap, info->offset, bytes); | |
2273 | else | |
2274 | __bitmap_clear_bits(ctl, bitmap, info->offset, bytes); | |
2275 | ||
2276 | if (!bitmap->bytes) | |
2277 | free_bitmap(ctl, bitmap); | |
2278 | ||
2279 | return true; | |
2280 | } | |
2281 | ||
2282 | /* | |
2283 | * We prefer always to allocate from extent entries, both for clustered and | |
2284 | * non-clustered allocation requests. So when attempting to add a new extent | |
2285 | * entry, try to see if there's adjacent free space in bitmap entries, and if | |
2286 | * there is, migrate that space from the bitmaps to the extent. | |
2287 | * Like this we get better chances of satisfying space allocation requests | |
2288 | * because we attempt to satisfy them based on a single cache entry, and never | |
2289 | * on 2 or more entries - even if the entries represent a contiguous free space | |
2290 | * region (e.g. 1 extent entry + 1 bitmap entry starting where the extent entry | |
2291 | * ends). | |
2292 | */ | |
2293 | static void steal_from_bitmap(struct btrfs_free_space_ctl *ctl, | |
2294 | struct btrfs_free_space *info, | |
2295 | bool update_stat) | |
2296 | { | |
2297 | /* | |
2298 | * Only work with disconnected entries, as we can change their offset, | |
2299 | * and must be extent entries. | |
2300 | */ | |
2301 | ASSERT(!info->bitmap); | |
2302 | ASSERT(RB_EMPTY_NODE(&info->offset_index)); | |
2303 | ||
2304 | if (ctl->total_bitmaps > 0) { | |
2305 | bool stole_end; | |
2306 | bool stole_front = false; | |
2307 | ||
2308 | stole_end = steal_from_bitmap_to_end(ctl, info, update_stat); | |
2309 | if (ctl->total_bitmaps > 0) | |
2310 | stole_front = steal_from_bitmap_to_front(ctl, info, | |
2311 | update_stat); | |
2312 | ||
2313 | if (stole_end || stole_front) | |
2314 | try_merge_free_space(ctl, info, update_stat); | |
2315 | } | |
2316 | } | |
2317 | ||
ab8d0fc4 JM |
2318 | int __btrfs_add_free_space(struct btrfs_fs_info *fs_info, |
2319 | struct btrfs_free_space_ctl *ctl, | |
581bb050 | 2320 | u64 offset, u64 bytes) |
120d66ee LZ |
2321 | { |
2322 | struct btrfs_free_space *info; | |
2323 | int ret = 0; | |
2324 | ||
dc89e982 | 2325 | info = kmem_cache_zalloc(btrfs_free_space_cachep, GFP_NOFS); |
120d66ee LZ |
2326 | if (!info) |
2327 | return -ENOMEM; | |
2328 | ||
2329 | info->offset = offset; | |
2330 | info->bytes = bytes; | |
20005523 | 2331 | RB_CLEAR_NODE(&info->offset_index); |
120d66ee | 2332 | |
34d52cb6 | 2333 | spin_lock(&ctl->tree_lock); |
120d66ee | 2334 | |
34d52cb6 | 2335 | if (try_merge_free_space(ctl, info, true)) |
120d66ee LZ |
2336 | goto link; |
2337 | ||
2338 | /* | |
2339 | * There was no extent directly to the left or right of this new | |
2340 | * extent then we know we're going to have to allocate a new extent, so | |
2341 | * before we do that see if we need to drop this into a bitmap | |
2342 | */ | |
34d52cb6 | 2343 | ret = insert_into_bitmap(ctl, info); |
120d66ee LZ |
2344 | if (ret < 0) { |
2345 | goto out; | |
2346 | } else if (ret) { | |
2347 | ret = 0; | |
2348 | goto out; | |
2349 | } | |
2350 | link: | |
20005523 FM |
2351 | /* |
2352 | * Only steal free space from adjacent bitmaps if we're sure we're not | |
2353 | * going to add the new free space to existing bitmap entries - because | |
2354 | * that would mean unnecessary work that would be reverted. Therefore | |
2355 | * attempt to steal space from bitmaps if we're adding an extent entry. | |
2356 | */ | |
2357 | steal_from_bitmap(ctl, info, true); | |
2358 | ||
34d52cb6 | 2359 | ret = link_free_space(ctl, info); |
0f9dd46c | 2360 | if (ret) |
dc89e982 | 2361 | kmem_cache_free(btrfs_free_space_cachep, info); |
96303081 | 2362 | out: |
34d52cb6 | 2363 | spin_unlock(&ctl->tree_lock); |
6226cb0a | 2364 | |
0f9dd46c | 2365 | if (ret) { |
ab8d0fc4 | 2366 | btrfs_crit(fs_info, "unable to add free space :%d", ret); |
b12d6869 | 2367 | ASSERT(ret != -EEXIST); |
0f9dd46c JB |
2368 | } |
2369 | ||
0f9dd46c JB |
2370 | return ret; |
2371 | } | |
2372 | ||
6226cb0a JB |
2373 | int btrfs_remove_free_space(struct btrfs_block_group_cache *block_group, |
2374 | u64 offset, u64 bytes) | |
0f9dd46c | 2375 | { |
34d52cb6 | 2376 | struct btrfs_free_space_ctl *ctl = block_group->free_space_ctl; |
0f9dd46c | 2377 | struct btrfs_free_space *info; |
b0175117 JB |
2378 | int ret; |
2379 | bool re_search = false; | |
0f9dd46c | 2380 | |
34d52cb6 | 2381 | spin_lock(&ctl->tree_lock); |
6226cb0a | 2382 | |
96303081 | 2383 | again: |
b0175117 | 2384 | ret = 0; |
bdb7d303 JB |
2385 | if (!bytes) |
2386 | goto out_lock; | |
2387 | ||
34d52cb6 | 2388 | info = tree_search_offset(ctl, offset, 0, 0); |
96303081 | 2389 | if (!info) { |
6606bb97 JB |
2390 | /* |
2391 | * oops didn't find an extent that matched the space we wanted | |
2392 | * to remove, look for a bitmap instead | |
2393 | */ | |
34d52cb6 | 2394 | info = tree_search_offset(ctl, offset_to_bitmap(ctl, offset), |
6606bb97 JB |
2395 | 1, 0); |
2396 | if (!info) { | |
b0175117 JB |
2397 | /* |
2398 | * If we found a partial bit of our free space in a | |
2399 | * bitmap but then couldn't find the other part this may | |
2400 | * be a problem, so WARN about it. | |
24a70313 | 2401 | */ |
b0175117 | 2402 | WARN_ON(re_search); |
6606bb97 JB |
2403 | goto out_lock; |
2404 | } | |
96303081 JB |
2405 | } |
2406 | ||
b0175117 | 2407 | re_search = false; |
bdb7d303 | 2408 | if (!info->bitmap) { |
34d52cb6 | 2409 | unlink_free_space(ctl, info); |
bdb7d303 JB |
2410 | if (offset == info->offset) { |
2411 | u64 to_free = min(bytes, info->bytes); | |
2412 | ||
2413 | info->bytes -= to_free; | |
2414 | info->offset += to_free; | |
2415 | if (info->bytes) { | |
2416 | ret = link_free_space(ctl, info); | |
2417 | WARN_ON(ret); | |
2418 | } else { | |
2419 | kmem_cache_free(btrfs_free_space_cachep, info); | |
2420 | } | |
0f9dd46c | 2421 | |
bdb7d303 JB |
2422 | offset += to_free; |
2423 | bytes -= to_free; | |
2424 | goto again; | |
2425 | } else { | |
2426 | u64 old_end = info->bytes + info->offset; | |
9b49c9b9 | 2427 | |
bdb7d303 | 2428 | info->bytes = offset - info->offset; |
34d52cb6 | 2429 | ret = link_free_space(ctl, info); |
96303081 JB |
2430 | WARN_ON(ret); |
2431 | if (ret) | |
2432 | goto out_lock; | |
96303081 | 2433 | |
bdb7d303 JB |
2434 | /* Not enough bytes in this entry to satisfy us */ |
2435 | if (old_end < offset + bytes) { | |
2436 | bytes -= old_end - offset; | |
2437 | offset = old_end; | |
2438 | goto again; | |
2439 | } else if (old_end == offset + bytes) { | |
2440 | /* all done */ | |
2441 | goto out_lock; | |
2442 | } | |
2443 | spin_unlock(&ctl->tree_lock); | |
2444 | ||
2445 | ret = btrfs_add_free_space(block_group, offset + bytes, | |
2446 | old_end - (offset + bytes)); | |
2447 | WARN_ON(ret); | |
2448 | goto out; | |
2449 | } | |
0f9dd46c | 2450 | } |
96303081 | 2451 | |
34d52cb6 | 2452 | ret = remove_from_bitmap(ctl, info, &offset, &bytes); |
b0175117 JB |
2453 | if (ret == -EAGAIN) { |
2454 | re_search = true; | |
96303081 | 2455 | goto again; |
b0175117 | 2456 | } |
96303081 | 2457 | out_lock: |
34d52cb6 | 2458 | spin_unlock(&ctl->tree_lock); |
0f9dd46c | 2459 | out: |
25179201 JB |
2460 | return ret; |
2461 | } | |
2462 | ||
0f9dd46c JB |
2463 | void btrfs_dump_free_space(struct btrfs_block_group_cache *block_group, |
2464 | u64 bytes) | |
2465 | { | |
0b246afa | 2466 | struct btrfs_fs_info *fs_info = block_group->fs_info; |
34d52cb6 | 2467 | struct btrfs_free_space_ctl *ctl = block_group->free_space_ctl; |
0f9dd46c JB |
2468 | struct btrfs_free_space *info; |
2469 | struct rb_node *n; | |
2470 | int count = 0; | |
2471 | ||
34d52cb6 | 2472 | for (n = rb_first(&ctl->free_space_offset); n; n = rb_next(n)) { |
0f9dd46c | 2473 | info = rb_entry(n, struct btrfs_free_space, offset_index); |
f6175efa | 2474 | if (info->bytes >= bytes && !block_group->ro) |
0f9dd46c | 2475 | count++; |
0b246afa | 2476 | btrfs_crit(fs_info, "entry offset %llu, bytes %llu, bitmap %s", |
efe120a0 | 2477 | info->offset, info->bytes, |
96303081 | 2478 | (info->bitmap) ? "yes" : "no"); |
0f9dd46c | 2479 | } |
0b246afa | 2480 | btrfs_info(fs_info, "block group has cluster?: %s", |
96303081 | 2481 | list_empty(&block_group->cluster_list) ? "no" : "yes"); |
0b246afa | 2482 | btrfs_info(fs_info, |
efe120a0 | 2483 | "%d blocks of free space at or bigger than bytes is", count); |
0f9dd46c JB |
2484 | } |
2485 | ||
34d52cb6 | 2486 | void btrfs_init_free_space_ctl(struct btrfs_block_group_cache *block_group) |
0f9dd46c | 2487 | { |
0b246afa | 2488 | struct btrfs_fs_info *fs_info = block_group->fs_info; |
34d52cb6 | 2489 | struct btrfs_free_space_ctl *ctl = block_group->free_space_ctl; |
0f9dd46c | 2490 | |
34d52cb6 | 2491 | spin_lock_init(&ctl->tree_lock); |
0b246afa | 2492 | ctl->unit = fs_info->sectorsize; |
34d52cb6 LZ |
2493 | ctl->start = block_group->key.objectid; |
2494 | ctl->private = block_group; | |
2495 | ctl->op = &free_space_op; | |
55507ce3 FM |
2496 | INIT_LIST_HEAD(&ctl->trimming_ranges); |
2497 | mutex_init(&ctl->cache_writeout_mutex); | |
0f9dd46c | 2498 | |
34d52cb6 LZ |
2499 | /* |
2500 | * we only want to have 32k of ram per block group for keeping | |
2501 | * track of free space, and if we pass 1/2 of that we want to | |
2502 | * start converting things over to using bitmaps | |
2503 | */ | |
ee22184b | 2504 | ctl->extents_thresh = (SZ_32K / 2) / sizeof(struct btrfs_free_space); |
0f9dd46c JB |
2505 | } |
2506 | ||
fa9c0d79 CM |
2507 | /* |
2508 | * for a given cluster, put all of its extents back into the free | |
2509 | * space cache. If the block group passed doesn't match the block group | |
2510 | * pointed to by the cluster, someone else raced in and freed the | |
2511 | * cluster already. In that case, we just return without changing anything | |
2512 | */ | |
2513 | static int | |
2514 | __btrfs_return_cluster_to_free_space( | |
2515 | struct btrfs_block_group_cache *block_group, | |
2516 | struct btrfs_free_cluster *cluster) | |
2517 | { | |
34d52cb6 | 2518 | struct btrfs_free_space_ctl *ctl = block_group->free_space_ctl; |
fa9c0d79 CM |
2519 | struct btrfs_free_space *entry; |
2520 | struct rb_node *node; | |
2521 | ||
2522 | spin_lock(&cluster->lock); | |
2523 | if (cluster->block_group != block_group) | |
2524 | goto out; | |
2525 | ||
96303081 | 2526 | cluster->block_group = NULL; |
fa9c0d79 | 2527 | cluster->window_start = 0; |
96303081 | 2528 | list_del_init(&cluster->block_group_list); |
96303081 | 2529 | |
fa9c0d79 | 2530 | node = rb_first(&cluster->root); |
96303081 | 2531 | while (node) { |
4e69b598 JB |
2532 | bool bitmap; |
2533 | ||
fa9c0d79 CM |
2534 | entry = rb_entry(node, struct btrfs_free_space, offset_index); |
2535 | node = rb_next(&entry->offset_index); | |
2536 | rb_erase(&entry->offset_index, &cluster->root); | |
20005523 | 2537 | RB_CLEAR_NODE(&entry->offset_index); |
4e69b598 JB |
2538 | |
2539 | bitmap = (entry->bitmap != NULL); | |
20005523 | 2540 | if (!bitmap) { |
34d52cb6 | 2541 | try_merge_free_space(ctl, entry, false); |
20005523 FM |
2542 | steal_from_bitmap(ctl, entry, false); |
2543 | } | |
34d52cb6 | 2544 | tree_insert_offset(&ctl->free_space_offset, |
4e69b598 | 2545 | entry->offset, &entry->offset_index, bitmap); |
fa9c0d79 | 2546 | } |
6bef4d31 | 2547 | cluster->root = RB_ROOT; |
96303081 | 2548 | |
fa9c0d79 CM |
2549 | out: |
2550 | spin_unlock(&cluster->lock); | |
96303081 | 2551 | btrfs_put_block_group(block_group); |
fa9c0d79 CM |
2552 | return 0; |
2553 | } | |
2554 | ||
48a3b636 ES |
2555 | static void __btrfs_remove_free_space_cache_locked( |
2556 | struct btrfs_free_space_ctl *ctl) | |
0f9dd46c JB |
2557 | { |
2558 | struct btrfs_free_space *info; | |
2559 | struct rb_node *node; | |
581bb050 | 2560 | |
581bb050 LZ |
2561 | while ((node = rb_last(&ctl->free_space_offset)) != NULL) { |
2562 | info = rb_entry(node, struct btrfs_free_space, offset_index); | |
9b90f513 JB |
2563 | if (!info->bitmap) { |
2564 | unlink_free_space(ctl, info); | |
2565 | kmem_cache_free(btrfs_free_space_cachep, info); | |
2566 | } else { | |
2567 | free_bitmap(ctl, info); | |
2568 | } | |
351810c1 DS |
2569 | |
2570 | cond_resched_lock(&ctl->tree_lock); | |
581bb050 | 2571 | } |
09655373 CM |
2572 | } |
2573 | ||
2574 | void __btrfs_remove_free_space_cache(struct btrfs_free_space_ctl *ctl) | |
2575 | { | |
2576 | spin_lock(&ctl->tree_lock); | |
2577 | __btrfs_remove_free_space_cache_locked(ctl); | |
581bb050 LZ |
2578 | spin_unlock(&ctl->tree_lock); |
2579 | } | |
2580 | ||
2581 | void btrfs_remove_free_space_cache(struct btrfs_block_group_cache *block_group) | |
2582 | { | |
2583 | struct btrfs_free_space_ctl *ctl = block_group->free_space_ctl; | |
fa9c0d79 | 2584 | struct btrfs_free_cluster *cluster; |
96303081 | 2585 | struct list_head *head; |
0f9dd46c | 2586 | |
34d52cb6 | 2587 | spin_lock(&ctl->tree_lock); |
96303081 JB |
2588 | while ((head = block_group->cluster_list.next) != |
2589 | &block_group->cluster_list) { | |
2590 | cluster = list_entry(head, struct btrfs_free_cluster, | |
2591 | block_group_list); | |
fa9c0d79 CM |
2592 | |
2593 | WARN_ON(cluster->block_group != block_group); | |
2594 | __btrfs_return_cluster_to_free_space(block_group, cluster); | |
351810c1 DS |
2595 | |
2596 | cond_resched_lock(&ctl->tree_lock); | |
fa9c0d79 | 2597 | } |
09655373 | 2598 | __btrfs_remove_free_space_cache_locked(ctl); |
34d52cb6 | 2599 | spin_unlock(&ctl->tree_lock); |
fa9c0d79 | 2600 | |
0f9dd46c JB |
2601 | } |
2602 | ||
6226cb0a | 2603 | u64 btrfs_find_space_for_alloc(struct btrfs_block_group_cache *block_group, |
a4820398 MX |
2604 | u64 offset, u64 bytes, u64 empty_size, |
2605 | u64 *max_extent_size) | |
0f9dd46c | 2606 | { |
34d52cb6 | 2607 | struct btrfs_free_space_ctl *ctl = block_group->free_space_ctl; |
6226cb0a | 2608 | struct btrfs_free_space *entry = NULL; |
96303081 | 2609 | u64 bytes_search = bytes + empty_size; |
6226cb0a | 2610 | u64 ret = 0; |
53b381b3 DW |
2611 | u64 align_gap = 0; |
2612 | u64 align_gap_len = 0; | |
0f9dd46c | 2613 | |
34d52cb6 | 2614 | spin_lock(&ctl->tree_lock); |
53b381b3 | 2615 | entry = find_free_space(ctl, &offset, &bytes_search, |
a4820398 | 2616 | block_group->full_stripe_len, max_extent_size); |
6226cb0a | 2617 | if (!entry) |
96303081 JB |
2618 | goto out; |
2619 | ||
2620 | ret = offset; | |
2621 | if (entry->bitmap) { | |
34d52cb6 | 2622 | bitmap_clear_bits(ctl, entry, offset, bytes); |
edf6e2d1 | 2623 | if (!entry->bytes) |
34d52cb6 | 2624 | free_bitmap(ctl, entry); |
96303081 | 2625 | } else { |
34d52cb6 | 2626 | unlink_free_space(ctl, entry); |
53b381b3 DW |
2627 | align_gap_len = offset - entry->offset; |
2628 | align_gap = entry->offset; | |
2629 | ||
2630 | entry->offset = offset + bytes; | |
2631 | WARN_ON(entry->bytes < bytes + align_gap_len); | |
2632 | ||
2633 | entry->bytes -= bytes + align_gap_len; | |
6226cb0a | 2634 | if (!entry->bytes) |
dc89e982 | 2635 | kmem_cache_free(btrfs_free_space_cachep, entry); |
6226cb0a | 2636 | else |
34d52cb6 | 2637 | link_free_space(ctl, entry); |
6226cb0a | 2638 | } |
96303081 | 2639 | out: |
34d52cb6 | 2640 | spin_unlock(&ctl->tree_lock); |
817d52f8 | 2641 | |
53b381b3 | 2642 | if (align_gap_len) |
ab8d0fc4 JM |
2643 | __btrfs_add_free_space(block_group->fs_info, ctl, |
2644 | align_gap, align_gap_len); | |
0f9dd46c JB |
2645 | return ret; |
2646 | } | |
fa9c0d79 CM |
2647 | |
2648 | /* | |
2649 | * given a cluster, put all of its extents back into the free space | |
2650 | * cache. If a block group is passed, this function will only free | |
2651 | * a cluster that belongs to the passed block group. | |
2652 | * | |
2653 | * Otherwise, it'll get a reference on the block group pointed to by the | |
2654 | * cluster and remove the cluster from it. | |
2655 | */ | |
2656 | int btrfs_return_cluster_to_free_space( | |
2657 | struct btrfs_block_group_cache *block_group, | |
2658 | struct btrfs_free_cluster *cluster) | |
2659 | { | |
34d52cb6 | 2660 | struct btrfs_free_space_ctl *ctl; |
fa9c0d79 CM |
2661 | int ret; |
2662 | ||
2663 | /* first, get a safe pointer to the block group */ | |
2664 | spin_lock(&cluster->lock); | |
2665 | if (!block_group) { | |
2666 | block_group = cluster->block_group; | |
2667 | if (!block_group) { | |
2668 | spin_unlock(&cluster->lock); | |
2669 | return 0; | |
2670 | } | |
2671 | } else if (cluster->block_group != block_group) { | |
2672 | /* someone else has already freed it don't redo their work */ | |
2673 | spin_unlock(&cluster->lock); | |
2674 | return 0; | |
2675 | } | |
2676 | atomic_inc(&block_group->count); | |
2677 | spin_unlock(&cluster->lock); | |
2678 | ||
34d52cb6 LZ |
2679 | ctl = block_group->free_space_ctl; |
2680 | ||
fa9c0d79 | 2681 | /* now return any extents the cluster had on it */ |
34d52cb6 | 2682 | spin_lock(&ctl->tree_lock); |
fa9c0d79 | 2683 | ret = __btrfs_return_cluster_to_free_space(block_group, cluster); |
34d52cb6 | 2684 | spin_unlock(&ctl->tree_lock); |
fa9c0d79 CM |
2685 | |
2686 | /* finally drop our ref */ | |
2687 | btrfs_put_block_group(block_group); | |
2688 | return ret; | |
2689 | } | |
2690 | ||
96303081 JB |
2691 | static u64 btrfs_alloc_from_bitmap(struct btrfs_block_group_cache *block_group, |
2692 | struct btrfs_free_cluster *cluster, | |
4e69b598 | 2693 | struct btrfs_free_space *entry, |
a4820398 MX |
2694 | u64 bytes, u64 min_start, |
2695 | u64 *max_extent_size) | |
96303081 | 2696 | { |
34d52cb6 | 2697 | struct btrfs_free_space_ctl *ctl = block_group->free_space_ctl; |
96303081 JB |
2698 | int err; |
2699 | u64 search_start = cluster->window_start; | |
2700 | u64 search_bytes = bytes; | |
2701 | u64 ret = 0; | |
2702 | ||
96303081 JB |
2703 | search_start = min_start; |
2704 | search_bytes = bytes; | |
2705 | ||
0584f718 | 2706 | err = search_bitmap(ctl, entry, &search_start, &search_bytes, true); |
a4820398 MX |
2707 | if (err) { |
2708 | if (search_bytes > *max_extent_size) | |
2709 | *max_extent_size = search_bytes; | |
4e69b598 | 2710 | return 0; |
a4820398 | 2711 | } |
96303081 JB |
2712 | |
2713 | ret = search_start; | |
bb3ac5a4 | 2714 | __bitmap_clear_bits(ctl, entry, ret, bytes); |
96303081 JB |
2715 | |
2716 | return ret; | |
2717 | } | |
2718 | ||
fa9c0d79 CM |
2719 | /* |
2720 | * given a cluster, try to allocate 'bytes' from it, returns 0 | |
2721 | * if it couldn't find anything suitably large, or a logical disk offset | |
2722 | * if things worked out | |
2723 | */ | |
2724 | u64 btrfs_alloc_from_cluster(struct btrfs_block_group_cache *block_group, | |
2725 | struct btrfs_free_cluster *cluster, u64 bytes, | |
a4820398 | 2726 | u64 min_start, u64 *max_extent_size) |
fa9c0d79 | 2727 | { |
34d52cb6 | 2728 | struct btrfs_free_space_ctl *ctl = block_group->free_space_ctl; |
fa9c0d79 CM |
2729 | struct btrfs_free_space *entry = NULL; |
2730 | struct rb_node *node; | |
2731 | u64 ret = 0; | |
2732 | ||
2733 | spin_lock(&cluster->lock); | |
2734 | if (bytes > cluster->max_size) | |
2735 | goto out; | |
2736 | ||
2737 | if (cluster->block_group != block_group) | |
2738 | goto out; | |
2739 | ||
2740 | node = rb_first(&cluster->root); | |
2741 | if (!node) | |
2742 | goto out; | |
2743 | ||
2744 | entry = rb_entry(node, struct btrfs_free_space, offset_index); | |
67871254 | 2745 | while (1) { |
a4820398 MX |
2746 | if (entry->bytes < bytes && entry->bytes > *max_extent_size) |
2747 | *max_extent_size = entry->bytes; | |
2748 | ||
4e69b598 JB |
2749 | if (entry->bytes < bytes || |
2750 | (!entry->bitmap && entry->offset < min_start)) { | |
fa9c0d79 CM |
2751 | node = rb_next(&entry->offset_index); |
2752 | if (!node) | |
2753 | break; | |
2754 | entry = rb_entry(node, struct btrfs_free_space, | |
2755 | offset_index); | |
2756 | continue; | |
2757 | } | |
fa9c0d79 | 2758 | |
4e69b598 JB |
2759 | if (entry->bitmap) { |
2760 | ret = btrfs_alloc_from_bitmap(block_group, | |
2761 | cluster, entry, bytes, | |
a4820398 MX |
2762 | cluster->window_start, |
2763 | max_extent_size); | |
4e69b598 | 2764 | if (ret == 0) { |
4e69b598 JB |
2765 | node = rb_next(&entry->offset_index); |
2766 | if (!node) | |
2767 | break; | |
2768 | entry = rb_entry(node, struct btrfs_free_space, | |
2769 | offset_index); | |
2770 | continue; | |
2771 | } | |
9b230628 | 2772 | cluster->window_start += bytes; |
4e69b598 | 2773 | } else { |
4e69b598 JB |
2774 | ret = entry->offset; |
2775 | ||
2776 | entry->offset += bytes; | |
2777 | entry->bytes -= bytes; | |
2778 | } | |
fa9c0d79 | 2779 | |
5e71b5d5 | 2780 | if (entry->bytes == 0) |
fa9c0d79 | 2781 | rb_erase(&entry->offset_index, &cluster->root); |
fa9c0d79 CM |
2782 | break; |
2783 | } | |
2784 | out: | |
2785 | spin_unlock(&cluster->lock); | |
96303081 | 2786 | |
5e71b5d5 LZ |
2787 | if (!ret) |
2788 | return 0; | |
2789 | ||
34d52cb6 | 2790 | spin_lock(&ctl->tree_lock); |
5e71b5d5 | 2791 | |
34d52cb6 | 2792 | ctl->free_space -= bytes; |
5e71b5d5 | 2793 | if (entry->bytes == 0) { |
34d52cb6 | 2794 | ctl->free_extents--; |
4e69b598 JB |
2795 | if (entry->bitmap) { |
2796 | kfree(entry->bitmap); | |
34d52cb6 LZ |
2797 | ctl->total_bitmaps--; |
2798 | ctl->op->recalc_thresholds(ctl); | |
4e69b598 | 2799 | } |
dc89e982 | 2800 | kmem_cache_free(btrfs_free_space_cachep, entry); |
5e71b5d5 LZ |
2801 | } |
2802 | ||
34d52cb6 | 2803 | spin_unlock(&ctl->tree_lock); |
5e71b5d5 | 2804 | |
fa9c0d79 CM |
2805 | return ret; |
2806 | } | |
2807 | ||
96303081 JB |
2808 | static int btrfs_bitmap_cluster(struct btrfs_block_group_cache *block_group, |
2809 | struct btrfs_free_space *entry, | |
2810 | struct btrfs_free_cluster *cluster, | |
1bb91902 AO |
2811 | u64 offset, u64 bytes, |
2812 | u64 cont1_bytes, u64 min_bytes) | |
96303081 | 2813 | { |
34d52cb6 | 2814 | struct btrfs_free_space_ctl *ctl = block_group->free_space_ctl; |
96303081 JB |
2815 | unsigned long next_zero; |
2816 | unsigned long i; | |
1bb91902 AO |
2817 | unsigned long want_bits; |
2818 | unsigned long min_bits; | |
96303081 | 2819 | unsigned long found_bits; |
cef40483 | 2820 | unsigned long max_bits = 0; |
96303081 JB |
2821 | unsigned long start = 0; |
2822 | unsigned long total_found = 0; | |
4e69b598 | 2823 | int ret; |
96303081 | 2824 | |
96009762 | 2825 | i = offset_to_bit(entry->offset, ctl->unit, |
96303081 | 2826 | max_t(u64, offset, entry->offset)); |
96009762 WSH |
2827 | want_bits = bytes_to_bits(bytes, ctl->unit); |
2828 | min_bits = bytes_to_bits(min_bytes, ctl->unit); | |
96303081 | 2829 | |
cef40483 JB |
2830 | /* |
2831 | * Don't bother looking for a cluster in this bitmap if it's heavily | |
2832 | * fragmented. | |
2833 | */ | |
2834 | if (entry->max_extent_size && | |
2835 | entry->max_extent_size < cont1_bytes) | |
2836 | return -ENOSPC; | |
96303081 JB |
2837 | again: |
2838 | found_bits = 0; | |
ebb3dad4 | 2839 | for_each_set_bit_from(i, entry->bitmap, BITS_PER_BITMAP) { |
96303081 JB |
2840 | next_zero = find_next_zero_bit(entry->bitmap, |
2841 | BITS_PER_BITMAP, i); | |
1bb91902 | 2842 | if (next_zero - i >= min_bits) { |
96303081 | 2843 | found_bits = next_zero - i; |
cef40483 JB |
2844 | if (found_bits > max_bits) |
2845 | max_bits = found_bits; | |
96303081 JB |
2846 | break; |
2847 | } | |
cef40483 JB |
2848 | if (next_zero - i > max_bits) |
2849 | max_bits = next_zero - i; | |
96303081 JB |
2850 | i = next_zero; |
2851 | } | |
2852 | ||
cef40483 JB |
2853 | if (!found_bits) { |
2854 | entry->max_extent_size = (u64)max_bits * ctl->unit; | |
4e69b598 | 2855 | return -ENOSPC; |
cef40483 | 2856 | } |
96303081 | 2857 | |
1bb91902 | 2858 | if (!total_found) { |
96303081 | 2859 | start = i; |
b78d09bc | 2860 | cluster->max_size = 0; |
96303081 JB |
2861 | } |
2862 | ||
2863 | total_found += found_bits; | |
2864 | ||
96009762 WSH |
2865 | if (cluster->max_size < found_bits * ctl->unit) |
2866 | cluster->max_size = found_bits * ctl->unit; | |
96303081 | 2867 | |
1bb91902 AO |
2868 | if (total_found < want_bits || cluster->max_size < cont1_bytes) { |
2869 | i = next_zero + 1; | |
96303081 JB |
2870 | goto again; |
2871 | } | |
2872 | ||
96009762 | 2873 | cluster->window_start = start * ctl->unit + entry->offset; |
34d52cb6 | 2874 | rb_erase(&entry->offset_index, &ctl->free_space_offset); |
4e69b598 JB |
2875 | ret = tree_insert_offset(&cluster->root, entry->offset, |
2876 | &entry->offset_index, 1); | |
b12d6869 | 2877 | ASSERT(!ret); /* -EEXIST; Logic error */ |
96303081 | 2878 | |
3f7de037 | 2879 | trace_btrfs_setup_cluster(block_group, cluster, |
96009762 | 2880 | total_found * ctl->unit, 1); |
96303081 JB |
2881 | return 0; |
2882 | } | |
2883 | ||
4e69b598 JB |
2884 | /* |
2885 | * This searches the block group for just extents to fill the cluster with. | |
1bb91902 AO |
2886 | * Try to find a cluster with at least bytes total bytes, at least one |
2887 | * extent of cont1_bytes, and other clusters of at least min_bytes. | |
4e69b598 | 2888 | */ |
3de85bb9 JB |
2889 | static noinline int |
2890 | setup_cluster_no_bitmap(struct btrfs_block_group_cache *block_group, | |
2891 | struct btrfs_free_cluster *cluster, | |
2892 | struct list_head *bitmaps, u64 offset, u64 bytes, | |
1bb91902 | 2893 | u64 cont1_bytes, u64 min_bytes) |
4e69b598 | 2894 | { |
34d52cb6 | 2895 | struct btrfs_free_space_ctl *ctl = block_group->free_space_ctl; |
4e69b598 JB |
2896 | struct btrfs_free_space *first = NULL; |
2897 | struct btrfs_free_space *entry = NULL; | |
4e69b598 JB |
2898 | struct btrfs_free_space *last; |
2899 | struct rb_node *node; | |
4e69b598 JB |
2900 | u64 window_free; |
2901 | u64 max_extent; | |
3f7de037 | 2902 | u64 total_size = 0; |
4e69b598 | 2903 | |
34d52cb6 | 2904 | entry = tree_search_offset(ctl, offset, 0, 1); |
4e69b598 JB |
2905 | if (!entry) |
2906 | return -ENOSPC; | |
2907 | ||
2908 | /* | |
2909 | * We don't want bitmaps, so just move along until we find a normal | |
2910 | * extent entry. | |
2911 | */ | |
1bb91902 AO |
2912 | while (entry->bitmap || entry->bytes < min_bytes) { |
2913 | if (entry->bitmap && list_empty(&entry->list)) | |
86d4a77b | 2914 | list_add_tail(&entry->list, bitmaps); |
4e69b598 JB |
2915 | node = rb_next(&entry->offset_index); |
2916 | if (!node) | |
2917 | return -ENOSPC; | |
2918 | entry = rb_entry(node, struct btrfs_free_space, offset_index); | |
2919 | } | |
2920 | ||
4e69b598 JB |
2921 | window_free = entry->bytes; |
2922 | max_extent = entry->bytes; | |
2923 | first = entry; | |
2924 | last = entry; | |
4e69b598 | 2925 | |
1bb91902 AO |
2926 | for (node = rb_next(&entry->offset_index); node; |
2927 | node = rb_next(&entry->offset_index)) { | |
4e69b598 JB |
2928 | entry = rb_entry(node, struct btrfs_free_space, offset_index); |
2929 | ||
86d4a77b JB |
2930 | if (entry->bitmap) { |
2931 | if (list_empty(&entry->list)) | |
2932 | list_add_tail(&entry->list, bitmaps); | |
4e69b598 | 2933 | continue; |
86d4a77b JB |
2934 | } |
2935 | ||
1bb91902 AO |
2936 | if (entry->bytes < min_bytes) |
2937 | continue; | |
2938 | ||
2939 | last = entry; | |
2940 | window_free += entry->bytes; | |
2941 | if (entry->bytes > max_extent) | |
4e69b598 | 2942 | max_extent = entry->bytes; |
4e69b598 JB |
2943 | } |
2944 | ||
1bb91902 AO |
2945 | if (window_free < bytes || max_extent < cont1_bytes) |
2946 | return -ENOSPC; | |
2947 | ||
4e69b598 JB |
2948 | cluster->window_start = first->offset; |
2949 | ||
2950 | node = &first->offset_index; | |
2951 | ||
2952 | /* | |
2953 | * now we've found our entries, pull them out of the free space | |
2954 | * cache and put them into the cluster rbtree | |
2955 | */ | |
2956 | do { | |
2957 | int ret; | |
2958 | ||
2959 | entry = rb_entry(node, struct btrfs_free_space, offset_index); | |
2960 | node = rb_next(&entry->offset_index); | |
1bb91902 | 2961 | if (entry->bitmap || entry->bytes < min_bytes) |
4e69b598 JB |
2962 | continue; |
2963 | ||
34d52cb6 | 2964 | rb_erase(&entry->offset_index, &ctl->free_space_offset); |
4e69b598 JB |
2965 | ret = tree_insert_offset(&cluster->root, entry->offset, |
2966 | &entry->offset_index, 0); | |
3f7de037 | 2967 | total_size += entry->bytes; |
b12d6869 | 2968 | ASSERT(!ret); /* -EEXIST; Logic error */ |
4e69b598 JB |
2969 | } while (node && entry != last); |
2970 | ||
2971 | cluster->max_size = max_extent; | |
3f7de037 | 2972 | trace_btrfs_setup_cluster(block_group, cluster, total_size, 0); |
4e69b598 JB |
2973 | return 0; |
2974 | } | |
2975 | ||
2976 | /* | |
2977 | * This specifically looks for bitmaps that may work in the cluster, we assume | |
2978 | * that we have already failed to find extents that will work. | |
2979 | */ | |
3de85bb9 JB |
2980 | static noinline int |
2981 | setup_cluster_bitmap(struct btrfs_block_group_cache *block_group, | |
2982 | struct btrfs_free_cluster *cluster, | |
2983 | struct list_head *bitmaps, u64 offset, u64 bytes, | |
1bb91902 | 2984 | u64 cont1_bytes, u64 min_bytes) |
4e69b598 | 2985 | { |
34d52cb6 | 2986 | struct btrfs_free_space_ctl *ctl = block_group->free_space_ctl; |
1b9b922a | 2987 | struct btrfs_free_space *entry = NULL; |
4e69b598 | 2988 | int ret = -ENOSPC; |
0f0fbf1d | 2989 | u64 bitmap_offset = offset_to_bitmap(ctl, offset); |
4e69b598 | 2990 | |
34d52cb6 | 2991 | if (ctl->total_bitmaps == 0) |
4e69b598 JB |
2992 | return -ENOSPC; |
2993 | ||
0f0fbf1d LZ |
2994 | /* |
2995 | * The bitmap that covers offset won't be in the list unless offset | |
2996 | * is just its start offset. | |
2997 | */ | |
1b9b922a CM |
2998 | if (!list_empty(bitmaps)) |
2999 | entry = list_first_entry(bitmaps, struct btrfs_free_space, list); | |
3000 | ||
3001 | if (!entry || entry->offset != bitmap_offset) { | |
0f0fbf1d LZ |
3002 | entry = tree_search_offset(ctl, bitmap_offset, 1, 0); |
3003 | if (entry && list_empty(&entry->list)) | |
3004 | list_add(&entry->list, bitmaps); | |
3005 | } | |
3006 | ||
86d4a77b | 3007 | list_for_each_entry(entry, bitmaps, list) { |
357b9784 | 3008 | if (entry->bytes < bytes) |
86d4a77b JB |
3009 | continue; |
3010 | ret = btrfs_bitmap_cluster(block_group, entry, cluster, offset, | |
1bb91902 | 3011 | bytes, cont1_bytes, min_bytes); |
86d4a77b JB |
3012 | if (!ret) |
3013 | return 0; | |
3014 | } | |
3015 | ||
3016 | /* | |
52621cb6 LZ |
3017 | * The bitmaps list has all the bitmaps that record free space |
3018 | * starting after offset, so no more search is required. | |
86d4a77b | 3019 | */ |
52621cb6 | 3020 | return -ENOSPC; |
4e69b598 JB |
3021 | } |
3022 | ||
fa9c0d79 CM |
3023 | /* |
3024 | * here we try to find a cluster of blocks in a block group. The goal | |
1bb91902 | 3025 | * is to find at least bytes+empty_size. |
fa9c0d79 CM |
3026 | * We might not find them all in one contiguous area. |
3027 | * | |
3028 | * returns zero and sets up cluster if things worked out, otherwise | |
3029 | * it returns -enospc | |
3030 | */ | |
2ff7e61e | 3031 | int btrfs_find_space_cluster(struct btrfs_fs_info *fs_info, |
fa9c0d79 CM |
3032 | struct btrfs_block_group_cache *block_group, |
3033 | struct btrfs_free_cluster *cluster, | |
3034 | u64 offset, u64 bytes, u64 empty_size) | |
3035 | { | |
34d52cb6 | 3036 | struct btrfs_free_space_ctl *ctl = block_group->free_space_ctl; |
86d4a77b | 3037 | struct btrfs_free_space *entry, *tmp; |
52621cb6 | 3038 | LIST_HEAD(bitmaps); |
fa9c0d79 | 3039 | u64 min_bytes; |
1bb91902 | 3040 | u64 cont1_bytes; |
fa9c0d79 CM |
3041 | int ret; |
3042 | ||
1bb91902 AO |
3043 | /* |
3044 | * Choose the minimum extent size we'll require for this | |
3045 | * cluster. For SSD_SPREAD, don't allow any fragmentation. | |
3046 | * For metadata, allow allocates with smaller extents. For | |
3047 | * data, keep it dense. | |
3048 | */ | |
0b246afa | 3049 | if (btrfs_test_opt(fs_info, SSD_SPREAD)) { |
1bb91902 | 3050 | cont1_bytes = min_bytes = bytes + empty_size; |
451d7585 | 3051 | } else if (block_group->flags & BTRFS_BLOCK_GROUP_METADATA) { |
1bb91902 | 3052 | cont1_bytes = bytes; |
0b246afa | 3053 | min_bytes = fs_info->sectorsize; |
1bb91902 AO |
3054 | } else { |
3055 | cont1_bytes = max(bytes, (bytes + empty_size) >> 2); | |
0b246afa | 3056 | min_bytes = fs_info->sectorsize; |
1bb91902 | 3057 | } |
fa9c0d79 | 3058 | |
34d52cb6 | 3059 | spin_lock(&ctl->tree_lock); |
7d0d2e8e JB |
3060 | |
3061 | /* | |
3062 | * If we know we don't have enough space to make a cluster don't even | |
3063 | * bother doing all the work to try and find one. | |
3064 | */ | |
1bb91902 | 3065 | if (ctl->free_space < bytes) { |
34d52cb6 | 3066 | spin_unlock(&ctl->tree_lock); |
7d0d2e8e JB |
3067 | return -ENOSPC; |
3068 | } | |
3069 | ||
fa9c0d79 CM |
3070 | spin_lock(&cluster->lock); |
3071 | ||
3072 | /* someone already found a cluster, hooray */ | |
3073 | if (cluster->block_group) { | |
3074 | ret = 0; | |
3075 | goto out; | |
3076 | } | |
fa9c0d79 | 3077 | |
3f7de037 JB |
3078 | trace_btrfs_find_cluster(block_group, offset, bytes, empty_size, |
3079 | min_bytes); | |
3080 | ||
86d4a77b | 3081 | ret = setup_cluster_no_bitmap(block_group, cluster, &bitmaps, offset, |
1bb91902 AO |
3082 | bytes + empty_size, |
3083 | cont1_bytes, min_bytes); | |
4e69b598 | 3084 | if (ret) |
86d4a77b | 3085 | ret = setup_cluster_bitmap(block_group, cluster, &bitmaps, |
1bb91902 AO |
3086 | offset, bytes + empty_size, |
3087 | cont1_bytes, min_bytes); | |
86d4a77b JB |
3088 | |
3089 | /* Clear our temporary list */ | |
3090 | list_for_each_entry_safe(entry, tmp, &bitmaps, list) | |
3091 | list_del_init(&entry->list); | |
fa9c0d79 | 3092 | |
4e69b598 JB |
3093 | if (!ret) { |
3094 | atomic_inc(&block_group->count); | |
3095 | list_add_tail(&cluster->block_group_list, | |
3096 | &block_group->cluster_list); | |
3097 | cluster->block_group = block_group; | |
3f7de037 JB |
3098 | } else { |
3099 | trace_btrfs_failed_cluster_setup(block_group); | |
fa9c0d79 | 3100 | } |
fa9c0d79 CM |
3101 | out: |
3102 | spin_unlock(&cluster->lock); | |
34d52cb6 | 3103 | spin_unlock(&ctl->tree_lock); |
fa9c0d79 CM |
3104 | |
3105 | return ret; | |
3106 | } | |
3107 | ||
3108 | /* | |
3109 | * simple code to zero out a cluster | |
3110 | */ | |
3111 | void btrfs_init_free_cluster(struct btrfs_free_cluster *cluster) | |
3112 | { | |
3113 | spin_lock_init(&cluster->lock); | |
3114 | spin_lock_init(&cluster->refill_lock); | |
6bef4d31 | 3115 | cluster->root = RB_ROOT; |
fa9c0d79 | 3116 | cluster->max_size = 0; |
c759c4e1 | 3117 | cluster->fragmented = false; |
fa9c0d79 CM |
3118 | INIT_LIST_HEAD(&cluster->block_group_list); |
3119 | cluster->block_group = NULL; | |
3120 | } | |
3121 | ||
7fe1e641 LZ |
3122 | static int do_trimming(struct btrfs_block_group_cache *block_group, |
3123 | u64 *total_trimmed, u64 start, u64 bytes, | |
55507ce3 FM |
3124 | u64 reserved_start, u64 reserved_bytes, |
3125 | struct btrfs_trim_range *trim_entry) | |
f7039b1d | 3126 | { |
7fe1e641 | 3127 | struct btrfs_space_info *space_info = block_group->space_info; |
f7039b1d | 3128 | struct btrfs_fs_info *fs_info = block_group->fs_info; |
55507ce3 | 3129 | struct btrfs_free_space_ctl *ctl = block_group->free_space_ctl; |
7fe1e641 LZ |
3130 | int ret; |
3131 | int update = 0; | |
3132 | u64 trimmed = 0; | |
f7039b1d | 3133 | |
7fe1e641 LZ |
3134 | spin_lock(&space_info->lock); |
3135 | spin_lock(&block_group->lock); | |
3136 | if (!block_group->ro) { | |
3137 | block_group->reserved += reserved_bytes; | |
3138 | space_info->bytes_reserved += reserved_bytes; | |
3139 | update = 1; | |
3140 | } | |
3141 | spin_unlock(&block_group->lock); | |
3142 | spin_unlock(&space_info->lock); | |
3143 | ||
2ff7e61e | 3144 | ret = btrfs_discard_extent(fs_info, start, bytes, &trimmed); |
7fe1e641 LZ |
3145 | if (!ret) |
3146 | *total_trimmed += trimmed; | |
3147 | ||
55507ce3 | 3148 | mutex_lock(&ctl->cache_writeout_mutex); |
7fe1e641 | 3149 | btrfs_add_free_space(block_group, reserved_start, reserved_bytes); |
55507ce3 FM |
3150 | list_del(&trim_entry->list); |
3151 | mutex_unlock(&ctl->cache_writeout_mutex); | |
7fe1e641 LZ |
3152 | |
3153 | if (update) { | |
3154 | spin_lock(&space_info->lock); | |
3155 | spin_lock(&block_group->lock); | |
3156 | if (block_group->ro) | |
3157 | space_info->bytes_readonly += reserved_bytes; | |
3158 | block_group->reserved -= reserved_bytes; | |
3159 | space_info->bytes_reserved -= reserved_bytes; | |
3160 | spin_unlock(&space_info->lock); | |
3161 | spin_unlock(&block_group->lock); | |
3162 | } | |
3163 | ||
3164 | return ret; | |
3165 | } | |
3166 | ||
3167 | static int trim_no_bitmap(struct btrfs_block_group_cache *block_group, | |
3168 | u64 *total_trimmed, u64 start, u64 end, u64 minlen) | |
3169 | { | |
3170 | struct btrfs_free_space_ctl *ctl = block_group->free_space_ctl; | |
3171 | struct btrfs_free_space *entry; | |
3172 | struct rb_node *node; | |
3173 | int ret = 0; | |
3174 | u64 extent_start; | |
3175 | u64 extent_bytes; | |
3176 | u64 bytes; | |
f7039b1d LD |
3177 | |
3178 | while (start < end) { | |
55507ce3 FM |
3179 | struct btrfs_trim_range trim_entry; |
3180 | ||
3181 | mutex_lock(&ctl->cache_writeout_mutex); | |
34d52cb6 | 3182 | spin_lock(&ctl->tree_lock); |
f7039b1d | 3183 | |
34d52cb6 LZ |
3184 | if (ctl->free_space < minlen) { |
3185 | spin_unlock(&ctl->tree_lock); | |
55507ce3 | 3186 | mutex_unlock(&ctl->cache_writeout_mutex); |
f7039b1d LD |
3187 | break; |
3188 | } | |
3189 | ||
34d52cb6 | 3190 | entry = tree_search_offset(ctl, start, 0, 1); |
7fe1e641 | 3191 | if (!entry) { |
34d52cb6 | 3192 | spin_unlock(&ctl->tree_lock); |
55507ce3 | 3193 | mutex_unlock(&ctl->cache_writeout_mutex); |
f7039b1d LD |
3194 | break; |
3195 | } | |
3196 | ||
7fe1e641 LZ |
3197 | /* skip bitmaps */ |
3198 | while (entry->bitmap) { | |
3199 | node = rb_next(&entry->offset_index); | |
3200 | if (!node) { | |
34d52cb6 | 3201 | spin_unlock(&ctl->tree_lock); |
55507ce3 | 3202 | mutex_unlock(&ctl->cache_writeout_mutex); |
7fe1e641 | 3203 | goto out; |
f7039b1d | 3204 | } |
7fe1e641 LZ |
3205 | entry = rb_entry(node, struct btrfs_free_space, |
3206 | offset_index); | |
f7039b1d LD |
3207 | } |
3208 | ||
7fe1e641 LZ |
3209 | if (entry->offset >= end) { |
3210 | spin_unlock(&ctl->tree_lock); | |
55507ce3 | 3211 | mutex_unlock(&ctl->cache_writeout_mutex); |
7fe1e641 | 3212 | break; |
f7039b1d LD |
3213 | } |
3214 | ||
7fe1e641 LZ |
3215 | extent_start = entry->offset; |
3216 | extent_bytes = entry->bytes; | |
3217 | start = max(start, extent_start); | |
3218 | bytes = min(extent_start + extent_bytes, end) - start; | |
3219 | if (bytes < minlen) { | |
3220 | spin_unlock(&ctl->tree_lock); | |
55507ce3 | 3221 | mutex_unlock(&ctl->cache_writeout_mutex); |
7fe1e641 | 3222 | goto next; |
f7039b1d LD |
3223 | } |
3224 | ||
7fe1e641 LZ |
3225 | unlink_free_space(ctl, entry); |
3226 | kmem_cache_free(btrfs_free_space_cachep, entry); | |
3227 | ||
34d52cb6 | 3228 | spin_unlock(&ctl->tree_lock); |
55507ce3 FM |
3229 | trim_entry.start = extent_start; |
3230 | trim_entry.bytes = extent_bytes; | |
3231 | list_add_tail(&trim_entry.list, &ctl->trimming_ranges); | |
3232 | mutex_unlock(&ctl->cache_writeout_mutex); | |
f7039b1d | 3233 | |
7fe1e641 | 3234 | ret = do_trimming(block_group, total_trimmed, start, bytes, |
55507ce3 | 3235 | extent_start, extent_bytes, &trim_entry); |
7fe1e641 LZ |
3236 | if (ret) |
3237 | break; | |
3238 | next: | |
3239 | start += bytes; | |
f7039b1d | 3240 | |
7fe1e641 LZ |
3241 | if (fatal_signal_pending(current)) { |
3242 | ret = -ERESTARTSYS; | |
3243 | break; | |
3244 | } | |
3245 | ||
3246 | cond_resched(); | |
3247 | } | |
3248 | out: | |
3249 | return ret; | |
3250 | } | |
3251 | ||
3252 | static int trim_bitmaps(struct btrfs_block_group_cache *block_group, | |
3253 | u64 *total_trimmed, u64 start, u64 end, u64 minlen) | |
3254 | { | |
3255 | struct btrfs_free_space_ctl *ctl = block_group->free_space_ctl; | |
3256 | struct btrfs_free_space *entry; | |
3257 | int ret = 0; | |
3258 | int ret2; | |
3259 | u64 bytes; | |
3260 | u64 offset = offset_to_bitmap(ctl, start); | |
3261 | ||
3262 | while (offset < end) { | |
3263 | bool next_bitmap = false; | |
55507ce3 | 3264 | struct btrfs_trim_range trim_entry; |
7fe1e641 | 3265 | |
55507ce3 | 3266 | mutex_lock(&ctl->cache_writeout_mutex); |
7fe1e641 LZ |
3267 | spin_lock(&ctl->tree_lock); |
3268 | ||
3269 | if (ctl->free_space < minlen) { | |
3270 | spin_unlock(&ctl->tree_lock); | |
55507ce3 | 3271 | mutex_unlock(&ctl->cache_writeout_mutex); |
7fe1e641 LZ |
3272 | break; |
3273 | } | |
3274 | ||
3275 | entry = tree_search_offset(ctl, offset, 1, 0); | |
3276 | if (!entry) { | |
3277 | spin_unlock(&ctl->tree_lock); | |
55507ce3 | 3278 | mutex_unlock(&ctl->cache_writeout_mutex); |
7fe1e641 LZ |
3279 | next_bitmap = true; |
3280 | goto next; | |
3281 | } | |
3282 | ||
3283 | bytes = minlen; | |
0584f718 | 3284 | ret2 = search_bitmap(ctl, entry, &start, &bytes, false); |
7fe1e641 LZ |
3285 | if (ret2 || start >= end) { |
3286 | spin_unlock(&ctl->tree_lock); | |
55507ce3 | 3287 | mutex_unlock(&ctl->cache_writeout_mutex); |
7fe1e641 LZ |
3288 | next_bitmap = true; |
3289 | goto next; | |
3290 | } | |
3291 | ||
3292 | bytes = min(bytes, end - start); | |
3293 | if (bytes < minlen) { | |
3294 | spin_unlock(&ctl->tree_lock); | |
55507ce3 | 3295 | mutex_unlock(&ctl->cache_writeout_mutex); |
7fe1e641 LZ |
3296 | goto next; |
3297 | } | |
3298 | ||
3299 | bitmap_clear_bits(ctl, entry, start, bytes); | |
3300 | if (entry->bytes == 0) | |
3301 | free_bitmap(ctl, entry); | |
3302 | ||
3303 | spin_unlock(&ctl->tree_lock); | |
55507ce3 FM |
3304 | trim_entry.start = start; |
3305 | trim_entry.bytes = bytes; | |
3306 | list_add_tail(&trim_entry.list, &ctl->trimming_ranges); | |
3307 | mutex_unlock(&ctl->cache_writeout_mutex); | |
7fe1e641 LZ |
3308 | |
3309 | ret = do_trimming(block_group, total_trimmed, start, bytes, | |
55507ce3 | 3310 | start, bytes, &trim_entry); |
7fe1e641 LZ |
3311 | if (ret) |
3312 | break; | |
3313 | next: | |
3314 | if (next_bitmap) { | |
3315 | offset += BITS_PER_BITMAP * ctl->unit; | |
3316 | } else { | |
3317 | start += bytes; | |
3318 | if (start >= offset + BITS_PER_BITMAP * ctl->unit) | |
3319 | offset += BITS_PER_BITMAP * ctl->unit; | |
f7039b1d | 3320 | } |
f7039b1d LD |
3321 | |
3322 | if (fatal_signal_pending(current)) { | |
3323 | ret = -ERESTARTSYS; | |
3324 | break; | |
3325 | } | |
3326 | ||
3327 | cond_resched(); | |
3328 | } | |
3329 | ||
3330 | return ret; | |
3331 | } | |
581bb050 | 3332 | |
e33e17ee | 3333 | void btrfs_get_block_group_trimming(struct btrfs_block_group_cache *cache) |
7fe1e641 | 3334 | { |
e33e17ee JM |
3335 | atomic_inc(&cache->trimming); |
3336 | } | |
7fe1e641 | 3337 | |
e33e17ee JM |
3338 | void btrfs_put_block_group_trimming(struct btrfs_block_group_cache *block_group) |
3339 | { | |
0b246afa | 3340 | struct btrfs_fs_info *fs_info = block_group->fs_info; |
e33e17ee JM |
3341 | struct extent_map_tree *em_tree; |
3342 | struct extent_map *em; | |
3343 | bool cleanup; | |
7fe1e641 | 3344 | |
04216820 | 3345 | spin_lock(&block_group->lock); |
e33e17ee JM |
3346 | cleanup = (atomic_dec_and_test(&block_group->trimming) && |
3347 | block_group->removed); | |
04216820 FM |
3348 | spin_unlock(&block_group->lock); |
3349 | ||
e33e17ee | 3350 | if (cleanup) { |
34441361 | 3351 | mutex_lock(&fs_info->chunk_mutex); |
0b246afa | 3352 | em_tree = &fs_info->mapping_tree.map_tree; |
04216820 FM |
3353 | write_lock(&em_tree->lock); |
3354 | em = lookup_extent_mapping(em_tree, block_group->key.objectid, | |
3355 | 1); | |
3356 | BUG_ON(!em); /* logic error, can't happen */ | |
a1e7e16e FM |
3357 | /* |
3358 | * remove_extent_mapping() will delete us from the pinned_chunks | |
3359 | * list, which is protected by the chunk mutex. | |
3360 | */ | |
04216820 FM |
3361 | remove_extent_mapping(em_tree, em); |
3362 | write_unlock(&em_tree->lock); | |
34441361 | 3363 | mutex_unlock(&fs_info->chunk_mutex); |
04216820 FM |
3364 | |
3365 | /* once for us and once for the tree */ | |
3366 | free_extent_map(em); | |
3367 | free_extent_map(em); | |
946ddbe8 FM |
3368 | |
3369 | /* | |
3370 | * We've left one free space entry and other tasks trimming | |
3371 | * this block group have left 1 entry each one. Free them. | |
3372 | */ | |
3373 | __btrfs_remove_free_space_cache(block_group->free_space_ctl); | |
e33e17ee JM |
3374 | } |
3375 | } | |
3376 | ||
3377 | int btrfs_trim_block_group(struct btrfs_block_group_cache *block_group, | |
3378 | u64 *trimmed, u64 start, u64 end, u64 minlen) | |
3379 | { | |
3380 | int ret; | |
3381 | ||
3382 | *trimmed = 0; | |
3383 | ||
3384 | spin_lock(&block_group->lock); | |
3385 | if (block_group->removed) { | |
04216820 | 3386 | spin_unlock(&block_group->lock); |
e33e17ee | 3387 | return 0; |
04216820 | 3388 | } |
e33e17ee JM |
3389 | btrfs_get_block_group_trimming(block_group); |
3390 | spin_unlock(&block_group->lock); | |
3391 | ||
3392 | ret = trim_no_bitmap(block_group, trimmed, start, end, minlen); | |
3393 | if (ret) | |
3394 | goto out; | |
7fe1e641 | 3395 | |
e33e17ee JM |
3396 | ret = trim_bitmaps(block_group, trimmed, start, end, minlen); |
3397 | out: | |
3398 | btrfs_put_block_group_trimming(block_group); | |
7fe1e641 LZ |
3399 | return ret; |
3400 | } | |
3401 | ||
581bb050 LZ |
3402 | /* |
3403 | * Find the left-most item in the cache tree, and then return the | |
3404 | * smallest inode number in the item. | |
3405 | * | |
3406 | * Note: the returned inode number may not be the smallest one in | |
3407 | * the tree, if the left-most item is a bitmap. | |
3408 | */ | |
3409 | u64 btrfs_find_ino_for_alloc(struct btrfs_root *fs_root) | |
3410 | { | |
3411 | struct btrfs_free_space_ctl *ctl = fs_root->free_ino_ctl; | |
3412 | struct btrfs_free_space *entry = NULL; | |
3413 | u64 ino = 0; | |
3414 | ||
3415 | spin_lock(&ctl->tree_lock); | |
3416 | ||
3417 | if (RB_EMPTY_ROOT(&ctl->free_space_offset)) | |
3418 | goto out; | |
3419 | ||
3420 | entry = rb_entry(rb_first(&ctl->free_space_offset), | |
3421 | struct btrfs_free_space, offset_index); | |
3422 | ||
3423 | if (!entry->bitmap) { | |
3424 | ino = entry->offset; | |
3425 | ||
3426 | unlink_free_space(ctl, entry); | |
3427 | entry->offset++; | |
3428 | entry->bytes--; | |
3429 | if (!entry->bytes) | |
3430 | kmem_cache_free(btrfs_free_space_cachep, entry); | |
3431 | else | |
3432 | link_free_space(ctl, entry); | |
3433 | } else { | |
3434 | u64 offset = 0; | |
3435 | u64 count = 1; | |
3436 | int ret; | |
3437 | ||
0584f718 | 3438 | ret = search_bitmap(ctl, entry, &offset, &count, true); |
79787eaa | 3439 | /* Logic error; Should be empty if it can't find anything */ |
b12d6869 | 3440 | ASSERT(!ret); |
581bb050 LZ |
3441 | |
3442 | ino = offset; | |
3443 | bitmap_clear_bits(ctl, entry, offset, 1); | |
3444 | if (entry->bytes == 0) | |
3445 | free_bitmap(ctl, entry); | |
3446 | } | |
3447 | out: | |
3448 | spin_unlock(&ctl->tree_lock); | |
3449 | ||
3450 | return ino; | |
3451 | } | |
82d5902d LZ |
3452 | |
3453 | struct inode *lookup_free_ino_inode(struct btrfs_root *root, | |
3454 | struct btrfs_path *path) | |
3455 | { | |
3456 | struct inode *inode = NULL; | |
3457 | ||
57cdc8db DS |
3458 | spin_lock(&root->ino_cache_lock); |
3459 | if (root->ino_cache_inode) | |
3460 | inode = igrab(root->ino_cache_inode); | |
3461 | spin_unlock(&root->ino_cache_lock); | |
82d5902d LZ |
3462 | if (inode) |
3463 | return inode; | |
3464 | ||
3465 | inode = __lookup_free_space_inode(root, path, 0); | |
3466 | if (IS_ERR(inode)) | |
3467 | return inode; | |
3468 | ||
57cdc8db | 3469 | spin_lock(&root->ino_cache_lock); |
7841cb28 | 3470 | if (!btrfs_fs_closing(root->fs_info)) |
57cdc8db DS |
3471 | root->ino_cache_inode = igrab(inode); |
3472 | spin_unlock(&root->ino_cache_lock); | |
82d5902d LZ |
3473 | |
3474 | return inode; | |
3475 | } | |
3476 | ||
3477 | int create_free_ino_inode(struct btrfs_root *root, | |
3478 | struct btrfs_trans_handle *trans, | |
3479 | struct btrfs_path *path) | |
3480 | { | |
3481 | return __create_free_space_inode(root, trans, path, | |
3482 | BTRFS_FREE_INO_OBJECTID, 0); | |
3483 | } | |
3484 | ||
3485 | int load_free_ino_cache(struct btrfs_fs_info *fs_info, struct btrfs_root *root) | |
3486 | { | |
3487 | struct btrfs_free_space_ctl *ctl = root->free_ino_ctl; | |
3488 | struct btrfs_path *path; | |
3489 | struct inode *inode; | |
3490 | int ret = 0; | |
3491 | u64 root_gen = btrfs_root_generation(&root->root_item); | |
3492 | ||
0b246afa | 3493 | if (!btrfs_test_opt(fs_info, INODE_MAP_CACHE)) |
4b9465cb CM |
3494 | return 0; |
3495 | ||
82d5902d LZ |
3496 | /* |
3497 | * If we're unmounting then just return, since this does a search on the | |
3498 | * normal root and not the commit root and we could deadlock. | |
3499 | */ | |
7841cb28 | 3500 | if (btrfs_fs_closing(fs_info)) |
82d5902d LZ |
3501 | return 0; |
3502 | ||
3503 | path = btrfs_alloc_path(); | |
3504 | if (!path) | |
3505 | return 0; | |
3506 | ||
3507 | inode = lookup_free_ino_inode(root, path); | |
3508 | if (IS_ERR(inode)) | |
3509 | goto out; | |
3510 | ||
3511 | if (root_gen != BTRFS_I(inode)->generation) | |
3512 | goto out_put; | |
3513 | ||
3514 | ret = __load_free_space_cache(root, inode, ctl, path, 0); | |
3515 | ||
3516 | if (ret < 0) | |
c2cf52eb SK |
3517 | btrfs_err(fs_info, |
3518 | "failed to load free ino cache for root %llu", | |
3519 | root->root_key.objectid); | |
82d5902d LZ |
3520 | out_put: |
3521 | iput(inode); | |
3522 | out: | |
3523 | btrfs_free_path(path); | |
3524 | return ret; | |
3525 | } | |
3526 | ||
3527 | int btrfs_write_out_ino_cache(struct btrfs_root *root, | |
3528 | struct btrfs_trans_handle *trans, | |
53645a91 FDBM |
3529 | struct btrfs_path *path, |
3530 | struct inode *inode) | |
82d5902d | 3531 | { |
0b246afa | 3532 | struct btrfs_fs_info *fs_info = root->fs_info; |
82d5902d | 3533 | struct btrfs_free_space_ctl *ctl = root->free_ino_ctl; |
82d5902d | 3534 | int ret; |
c9dc4c65 | 3535 | struct btrfs_io_ctl io_ctl; |
e43699d4 | 3536 | bool release_metadata = true; |
82d5902d | 3537 | |
0b246afa | 3538 | if (!btrfs_test_opt(fs_info, INODE_MAP_CACHE)) |
4b9465cb CM |
3539 | return 0; |
3540 | ||
85db36cf | 3541 | memset(&io_ctl, 0, sizeof(io_ctl)); |
c9dc4c65 | 3542 | ret = __btrfs_write_out_cache(root, inode, ctl, NULL, &io_ctl, |
85db36cf | 3543 | trans, path, 0); |
e43699d4 FM |
3544 | if (!ret) { |
3545 | /* | |
3546 | * At this point writepages() didn't error out, so our metadata | |
3547 | * reservation is released when the writeback finishes, at | |
3548 | * inode.c:btrfs_finish_ordered_io(), regardless of it finishing | |
3549 | * with or without an error. | |
3550 | */ | |
3551 | release_metadata = false; | |
afdb5718 | 3552 | ret = btrfs_wait_cache_io_root(root, trans, &io_ctl, path); |
e43699d4 | 3553 | } |
85db36cf | 3554 | |
c09544e0 | 3555 | if (ret) { |
e43699d4 FM |
3556 | if (release_metadata) |
3557 | btrfs_delalloc_release_metadata(inode, inode->i_size); | |
c09544e0 | 3558 | #ifdef DEBUG |
0b246afa JM |
3559 | btrfs_err(fs_info, |
3560 | "failed to write free ino cache for root %llu", | |
3561 | root->root_key.objectid); | |
c09544e0 JB |
3562 | #endif |
3563 | } | |
82d5902d | 3564 | |
82d5902d LZ |
3565 | return ret; |
3566 | } | |
74255aa0 JB |
3567 | |
3568 | #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS | |
dc11dd5d JB |
3569 | /* |
3570 | * Use this if you need to make a bitmap or extent entry specifically, it | |
3571 | * doesn't do any of the merging that add_free_space does, this acts a lot like | |
3572 | * how the free space cache loading stuff works, so you can get really weird | |
3573 | * configurations. | |
3574 | */ | |
3575 | int test_add_free_space_entry(struct btrfs_block_group_cache *cache, | |
3576 | u64 offset, u64 bytes, bool bitmap) | |
74255aa0 | 3577 | { |
dc11dd5d JB |
3578 | struct btrfs_free_space_ctl *ctl = cache->free_space_ctl; |
3579 | struct btrfs_free_space *info = NULL, *bitmap_info; | |
3580 | void *map = NULL; | |
3581 | u64 bytes_added; | |
3582 | int ret; | |
74255aa0 | 3583 | |
dc11dd5d JB |
3584 | again: |
3585 | if (!info) { | |
3586 | info = kmem_cache_zalloc(btrfs_free_space_cachep, GFP_NOFS); | |
3587 | if (!info) | |
3588 | return -ENOMEM; | |
74255aa0 JB |
3589 | } |
3590 | ||
dc11dd5d JB |
3591 | if (!bitmap) { |
3592 | spin_lock(&ctl->tree_lock); | |
3593 | info->offset = offset; | |
3594 | info->bytes = bytes; | |
cef40483 | 3595 | info->max_extent_size = 0; |
dc11dd5d JB |
3596 | ret = link_free_space(ctl, info); |
3597 | spin_unlock(&ctl->tree_lock); | |
3598 | if (ret) | |
3599 | kmem_cache_free(btrfs_free_space_cachep, info); | |
3600 | return ret; | |
3601 | } | |
3602 | ||
3603 | if (!map) { | |
09cbfeaf | 3604 | map = kzalloc(PAGE_SIZE, GFP_NOFS); |
dc11dd5d JB |
3605 | if (!map) { |
3606 | kmem_cache_free(btrfs_free_space_cachep, info); | |
3607 | return -ENOMEM; | |
3608 | } | |
3609 | } | |
3610 | ||
3611 | spin_lock(&ctl->tree_lock); | |
3612 | bitmap_info = tree_search_offset(ctl, offset_to_bitmap(ctl, offset), | |
3613 | 1, 0); | |
3614 | if (!bitmap_info) { | |
3615 | info->bitmap = map; | |
3616 | map = NULL; | |
3617 | add_new_bitmap(ctl, info, offset); | |
3618 | bitmap_info = info; | |
20005523 | 3619 | info = NULL; |
dc11dd5d | 3620 | } |
74255aa0 | 3621 | |
dc11dd5d | 3622 | bytes_added = add_bytes_to_bitmap(ctl, bitmap_info, offset, bytes); |
cef40483 | 3623 | |
dc11dd5d JB |
3624 | bytes -= bytes_added; |
3625 | offset += bytes_added; | |
3626 | spin_unlock(&ctl->tree_lock); | |
74255aa0 | 3627 | |
dc11dd5d JB |
3628 | if (bytes) |
3629 | goto again; | |
74255aa0 | 3630 | |
20005523 FM |
3631 | if (info) |
3632 | kmem_cache_free(btrfs_free_space_cachep, info); | |
dc11dd5d JB |
3633 | if (map) |
3634 | kfree(map); | |
3635 | return 0; | |
74255aa0 JB |
3636 | } |
3637 | ||
3638 | /* | |
3639 | * Checks to see if the given range is in the free space cache. This is really | |
3640 | * just used to check the absence of space, so if there is free space in the | |
3641 | * range at all we will return 1. | |
3642 | */ | |
dc11dd5d JB |
3643 | int test_check_exists(struct btrfs_block_group_cache *cache, |
3644 | u64 offset, u64 bytes) | |
74255aa0 JB |
3645 | { |
3646 | struct btrfs_free_space_ctl *ctl = cache->free_space_ctl; | |
3647 | struct btrfs_free_space *info; | |
3648 | int ret = 0; | |
3649 | ||
3650 | spin_lock(&ctl->tree_lock); | |
3651 | info = tree_search_offset(ctl, offset, 0, 0); | |
3652 | if (!info) { | |
3653 | info = tree_search_offset(ctl, offset_to_bitmap(ctl, offset), | |
3654 | 1, 0); | |
3655 | if (!info) | |
3656 | goto out; | |
3657 | } | |
3658 | ||
3659 | have_info: | |
3660 | if (info->bitmap) { | |
3661 | u64 bit_off, bit_bytes; | |
3662 | struct rb_node *n; | |
3663 | struct btrfs_free_space *tmp; | |
3664 | ||
3665 | bit_off = offset; | |
3666 | bit_bytes = ctl->unit; | |
0584f718 | 3667 | ret = search_bitmap(ctl, info, &bit_off, &bit_bytes, false); |
74255aa0 JB |
3668 | if (!ret) { |
3669 | if (bit_off == offset) { | |
3670 | ret = 1; | |
3671 | goto out; | |
3672 | } else if (bit_off > offset && | |
3673 | offset + bytes > bit_off) { | |
3674 | ret = 1; | |
3675 | goto out; | |
3676 | } | |
3677 | } | |
3678 | ||
3679 | n = rb_prev(&info->offset_index); | |
3680 | while (n) { | |
3681 | tmp = rb_entry(n, struct btrfs_free_space, | |
3682 | offset_index); | |
3683 | if (tmp->offset + tmp->bytes < offset) | |
3684 | break; | |
3685 | if (offset + bytes < tmp->offset) { | |
5473e0c4 | 3686 | n = rb_prev(&tmp->offset_index); |
74255aa0 JB |
3687 | continue; |
3688 | } | |
3689 | info = tmp; | |
3690 | goto have_info; | |
3691 | } | |
3692 | ||
3693 | n = rb_next(&info->offset_index); | |
3694 | while (n) { | |
3695 | tmp = rb_entry(n, struct btrfs_free_space, | |
3696 | offset_index); | |
3697 | if (offset + bytes < tmp->offset) | |
3698 | break; | |
3699 | if (tmp->offset + tmp->bytes < offset) { | |
5473e0c4 | 3700 | n = rb_next(&tmp->offset_index); |
74255aa0 JB |
3701 | continue; |
3702 | } | |
3703 | info = tmp; | |
3704 | goto have_info; | |
3705 | } | |
3706 | ||
20005523 | 3707 | ret = 0; |
74255aa0 JB |
3708 | goto out; |
3709 | } | |
3710 | ||
3711 | if (info->offset == offset) { | |
3712 | ret = 1; | |
3713 | goto out; | |
3714 | } | |
3715 | ||
3716 | if (offset > info->offset && offset < info->offset + info->bytes) | |
3717 | ret = 1; | |
3718 | out: | |
3719 | spin_unlock(&ctl->tree_lock); | |
3720 | return ret; | |
3721 | } | |
dc11dd5d | 3722 | #endif /* CONFIG_BTRFS_FS_RUN_SANITY_TESTS */ |