Commit | Line | Data |
---|---|---|
0f9dd46c JB |
1 | /* |
2 | * Copyright (C) 2008 Red Hat. All rights reserved. | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or | |
5 | * modify it under the terms of the GNU General Public | |
6 | * License v2 as published by the Free Software Foundation. | |
7 | * | |
8 | * This program is distributed in the hope that it will be useful, | |
9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
11 | * General Public License for more details. | |
12 | * | |
13 | * You should have received a copy of the GNU General Public | |
14 | * License along with this program; if not, write to the | |
15 | * Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
16 | * Boston, MA 021110-1307, USA. | |
17 | */ | |
18 | ||
96303081 | 19 | #include <linux/pagemap.h> |
0f9dd46c | 20 | #include <linux/sched.h> |
5a0e3ad6 | 21 | #include <linux/slab.h> |
96303081 | 22 | #include <linux/math64.h> |
6ab60601 | 23 | #include <linux/ratelimit.h> |
0f9dd46c | 24 | #include "ctree.h" |
fa9c0d79 CM |
25 | #include "free-space-cache.h" |
26 | #include "transaction.h" | |
0af3d00b | 27 | #include "disk-io.h" |
43be2146 | 28 | #include "extent_io.h" |
581bb050 | 29 | #include "inode-map.h" |
fa9c0d79 | 30 | |
96303081 JB |
31 | #define BITS_PER_BITMAP (PAGE_CACHE_SIZE * 8) |
32 | #define MAX_CACHE_BYTES_PER_GIG (32 * 1024) | |
0f9dd46c | 33 | |
34d52cb6 | 34 | static int link_free_space(struct btrfs_free_space_ctl *ctl, |
0cb59c99 | 35 | struct btrfs_free_space *info); |
cd023e7b JB |
36 | static void unlink_free_space(struct btrfs_free_space_ctl *ctl, |
37 | struct btrfs_free_space *info); | |
0cb59c99 | 38 | |
0414efae LZ |
39 | static struct inode *__lookup_free_space_inode(struct btrfs_root *root, |
40 | struct btrfs_path *path, | |
41 | u64 offset) | |
0af3d00b JB |
42 | { |
43 | struct btrfs_key key; | |
44 | struct btrfs_key location; | |
45 | struct btrfs_disk_key disk_key; | |
46 | struct btrfs_free_space_header *header; | |
47 | struct extent_buffer *leaf; | |
48 | struct inode *inode = NULL; | |
49 | int ret; | |
50 | ||
0af3d00b | 51 | key.objectid = BTRFS_FREE_SPACE_OBJECTID; |
0414efae | 52 | key.offset = offset; |
0af3d00b JB |
53 | key.type = 0; |
54 | ||
55 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); | |
56 | if (ret < 0) | |
57 | return ERR_PTR(ret); | |
58 | if (ret > 0) { | |
b3b4aa74 | 59 | btrfs_release_path(path); |
0af3d00b JB |
60 | return ERR_PTR(-ENOENT); |
61 | } | |
62 | ||
63 | leaf = path->nodes[0]; | |
64 | header = btrfs_item_ptr(leaf, path->slots[0], | |
65 | struct btrfs_free_space_header); | |
66 | btrfs_free_space_key(leaf, header, &disk_key); | |
67 | btrfs_disk_key_to_cpu(&location, &disk_key); | |
b3b4aa74 | 68 | btrfs_release_path(path); |
0af3d00b JB |
69 | |
70 | inode = btrfs_iget(root->fs_info->sb, &location, root, NULL); | |
71 | if (!inode) | |
72 | return ERR_PTR(-ENOENT); | |
73 | if (IS_ERR(inode)) | |
74 | return inode; | |
75 | if (is_bad_inode(inode)) { | |
76 | iput(inode); | |
77 | return ERR_PTR(-ENOENT); | |
78 | } | |
79 | ||
528c0327 AV |
80 | mapping_set_gfp_mask(inode->i_mapping, |
81 | mapping_gfp_mask(inode->i_mapping) & ~__GFP_FS); | |
adae52b9 | 82 | |
0414efae LZ |
83 | return inode; |
84 | } | |
85 | ||
86 | struct inode *lookup_free_space_inode(struct btrfs_root *root, | |
87 | struct btrfs_block_group_cache | |
88 | *block_group, struct btrfs_path *path) | |
89 | { | |
90 | struct inode *inode = NULL; | |
5b0e95bf | 91 | u32 flags = BTRFS_INODE_NODATASUM | BTRFS_INODE_NODATACOW; |
0414efae LZ |
92 | |
93 | spin_lock(&block_group->lock); | |
94 | if (block_group->inode) | |
95 | inode = igrab(block_group->inode); | |
96 | spin_unlock(&block_group->lock); | |
97 | if (inode) | |
98 | return inode; | |
99 | ||
100 | inode = __lookup_free_space_inode(root, path, | |
101 | block_group->key.objectid); | |
102 | if (IS_ERR(inode)) | |
103 | return inode; | |
104 | ||
0af3d00b | 105 | spin_lock(&block_group->lock); |
5b0e95bf | 106 | if (!((BTRFS_I(inode)->flags & flags) == flags)) { |
2f356126 | 107 | printk(KERN_INFO "Old style space inode found, converting.\n"); |
5b0e95bf JB |
108 | BTRFS_I(inode)->flags |= BTRFS_INODE_NODATASUM | |
109 | BTRFS_INODE_NODATACOW; | |
2f356126 JB |
110 | block_group->disk_cache_state = BTRFS_DC_CLEAR; |
111 | } | |
112 | ||
300e4f8a | 113 | if (!block_group->iref) { |
0af3d00b JB |
114 | block_group->inode = igrab(inode); |
115 | block_group->iref = 1; | |
116 | } | |
117 | spin_unlock(&block_group->lock); | |
118 | ||
119 | return inode; | |
120 | } | |
121 | ||
0414efae LZ |
122 | int __create_free_space_inode(struct btrfs_root *root, |
123 | struct btrfs_trans_handle *trans, | |
124 | struct btrfs_path *path, u64 ino, u64 offset) | |
0af3d00b JB |
125 | { |
126 | struct btrfs_key key; | |
127 | struct btrfs_disk_key disk_key; | |
128 | struct btrfs_free_space_header *header; | |
129 | struct btrfs_inode_item *inode_item; | |
130 | struct extent_buffer *leaf; | |
5b0e95bf | 131 | u64 flags = BTRFS_INODE_NOCOMPRESS | BTRFS_INODE_PREALLOC; |
0af3d00b JB |
132 | int ret; |
133 | ||
0414efae | 134 | ret = btrfs_insert_empty_inode(trans, root, path, ino); |
0af3d00b JB |
135 | if (ret) |
136 | return ret; | |
137 | ||
5b0e95bf JB |
138 | /* We inline crc's for the free disk space cache */ |
139 | if (ino != BTRFS_FREE_INO_OBJECTID) | |
140 | flags |= BTRFS_INODE_NODATASUM | BTRFS_INODE_NODATACOW; | |
141 | ||
0af3d00b JB |
142 | leaf = path->nodes[0]; |
143 | inode_item = btrfs_item_ptr(leaf, path->slots[0], | |
144 | struct btrfs_inode_item); | |
145 | btrfs_item_key(leaf, &disk_key, path->slots[0]); | |
146 | memset_extent_buffer(leaf, 0, (unsigned long)inode_item, | |
147 | sizeof(*inode_item)); | |
148 | btrfs_set_inode_generation(leaf, inode_item, trans->transid); | |
149 | btrfs_set_inode_size(leaf, inode_item, 0); | |
150 | btrfs_set_inode_nbytes(leaf, inode_item, 0); | |
151 | btrfs_set_inode_uid(leaf, inode_item, 0); | |
152 | btrfs_set_inode_gid(leaf, inode_item, 0); | |
153 | btrfs_set_inode_mode(leaf, inode_item, S_IFREG | 0600); | |
5b0e95bf | 154 | btrfs_set_inode_flags(leaf, inode_item, flags); |
0af3d00b JB |
155 | btrfs_set_inode_nlink(leaf, inode_item, 1); |
156 | btrfs_set_inode_transid(leaf, inode_item, trans->transid); | |
0414efae | 157 | btrfs_set_inode_block_group(leaf, inode_item, offset); |
0af3d00b | 158 | btrfs_mark_buffer_dirty(leaf); |
b3b4aa74 | 159 | btrfs_release_path(path); |
0af3d00b JB |
160 | |
161 | key.objectid = BTRFS_FREE_SPACE_OBJECTID; | |
0414efae | 162 | key.offset = offset; |
0af3d00b JB |
163 | key.type = 0; |
164 | ||
165 | ret = btrfs_insert_empty_item(trans, root, path, &key, | |
166 | sizeof(struct btrfs_free_space_header)); | |
167 | if (ret < 0) { | |
b3b4aa74 | 168 | btrfs_release_path(path); |
0af3d00b JB |
169 | return ret; |
170 | } | |
171 | leaf = path->nodes[0]; | |
172 | header = btrfs_item_ptr(leaf, path->slots[0], | |
173 | struct btrfs_free_space_header); | |
174 | memset_extent_buffer(leaf, 0, (unsigned long)header, sizeof(*header)); | |
175 | btrfs_set_free_space_key(leaf, header, &disk_key); | |
176 | btrfs_mark_buffer_dirty(leaf); | |
b3b4aa74 | 177 | btrfs_release_path(path); |
0af3d00b JB |
178 | |
179 | return 0; | |
180 | } | |
181 | ||
0414efae LZ |
182 | int create_free_space_inode(struct btrfs_root *root, |
183 | struct btrfs_trans_handle *trans, | |
184 | struct btrfs_block_group_cache *block_group, | |
185 | struct btrfs_path *path) | |
186 | { | |
187 | int ret; | |
188 | u64 ino; | |
189 | ||
190 | ret = btrfs_find_free_objectid(root, &ino); | |
191 | if (ret < 0) | |
192 | return ret; | |
193 | ||
194 | return __create_free_space_inode(root, trans, path, ino, | |
195 | block_group->key.objectid); | |
196 | } | |
197 | ||
0af3d00b JB |
198 | int btrfs_truncate_free_space_cache(struct btrfs_root *root, |
199 | struct btrfs_trans_handle *trans, | |
200 | struct btrfs_path *path, | |
201 | struct inode *inode) | |
202 | { | |
65450aa6 | 203 | struct btrfs_block_rsv *rsv; |
c8174313 | 204 | u64 needed_bytes; |
0af3d00b JB |
205 | loff_t oldsize; |
206 | int ret = 0; | |
207 | ||
65450aa6 | 208 | rsv = trans->block_rsv; |
c8174313 JB |
209 | trans->block_rsv = &root->fs_info->global_block_rsv; |
210 | ||
211 | /* 1 for slack space, 1 for updating the inode */ | |
212 | needed_bytes = btrfs_calc_trunc_metadata_size(root, 1) + | |
213 | btrfs_calc_trans_metadata_size(root, 1); | |
214 | ||
215 | spin_lock(&trans->block_rsv->lock); | |
216 | if (trans->block_rsv->reserved < needed_bytes) { | |
217 | spin_unlock(&trans->block_rsv->lock); | |
218 | trans->block_rsv = rsv; | |
219 | return -ENOSPC; | |
220 | } | |
221 | spin_unlock(&trans->block_rsv->lock); | |
0af3d00b JB |
222 | |
223 | oldsize = i_size_read(inode); | |
224 | btrfs_i_size_write(inode, 0); | |
225 | truncate_pagecache(inode, oldsize, 0); | |
226 | ||
227 | /* | |
228 | * We don't need an orphan item because truncating the free space cache | |
229 | * will never be split across transactions. | |
230 | */ | |
231 | ret = btrfs_truncate_inode_items(trans, root, inode, | |
232 | 0, BTRFS_EXTENT_DATA_KEY); | |
65450aa6 | 233 | |
0af3d00b | 234 | if (ret) { |
c8174313 | 235 | trans->block_rsv = rsv; |
79787eaa | 236 | btrfs_abort_transaction(trans, root, ret); |
0af3d00b JB |
237 | return ret; |
238 | } | |
239 | ||
82d5902d | 240 | ret = btrfs_update_inode(trans, root, inode); |
79787eaa JM |
241 | if (ret) |
242 | btrfs_abort_transaction(trans, root, ret); | |
c8174313 JB |
243 | trans->block_rsv = rsv; |
244 | ||
82d5902d | 245 | return ret; |
0af3d00b JB |
246 | } |
247 | ||
9d66e233 JB |
248 | static int readahead_cache(struct inode *inode) |
249 | { | |
250 | struct file_ra_state *ra; | |
251 | unsigned long last_index; | |
252 | ||
253 | ra = kzalloc(sizeof(*ra), GFP_NOFS); | |
254 | if (!ra) | |
255 | return -ENOMEM; | |
256 | ||
257 | file_ra_state_init(ra, inode->i_mapping); | |
258 | last_index = (i_size_read(inode) - 1) >> PAGE_CACHE_SHIFT; | |
259 | ||
260 | page_cache_sync_readahead(inode->i_mapping, ra, NULL, 0, last_index); | |
261 | ||
262 | kfree(ra); | |
263 | ||
264 | return 0; | |
265 | } | |
266 | ||
a67509c3 JB |
267 | struct io_ctl { |
268 | void *cur, *orig; | |
269 | struct page *page; | |
270 | struct page **pages; | |
271 | struct btrfs_root *root; | |
272 | unsigned long size; | |
273 | int index; | |
274 | int num_pages; | |
5b0e95bf | 275 | unsigned check_crcs:1; |
a67509c3 JB |
276 | }; |
277 | ||
278 | static int io_ctl_init(struct io_ctl *io_ctl, struct inode *inode, | |
279 | struct btrfs_root *root) | |
280 | { | |
281 | memset(io_ctl, 0, sizeof(struct io_ctl)); | |
282 | io_ctl->num_pages = (i_size_read(inode) + PAGE_CACHE_SIZE - 1) >> | |
283 | PAGE_CACHE_SHIFT; | |
284 | io_ctl->pages = kzalloc(sizeof(struct page *) * io_ctl->num_pages, | |
285 | GFP_NOFS); | |
286 | if (!io_ctl->pages) | |
287 | return -ENOMEM; | |
288 | io_ctl->root = root; | |
5b0e95bf JB |
289 | if (btrfs_ino(inode) != BTRFS_FREE_INO_OBJECTID) |
290 | io_ctl->check_crcs = 1; | |
a67509c3 JB |
291 | return 0; |
292 | } | |
293 | ||
294 | static void io_ctl_free(struct io_ctl *io_ctl) | |
295 | { | |
296 | kfree(io_ctl->pages); | |
297 | } | |
298 | ||
299 | static void io_ctl_unmap_page(struct io_ctl *io_ctl) | |
300 | { | |
301 | if (io_ctl->cur) { | |
302 | kunmap(io_ctl->page); | |
303 | io_ctl->cur = NULL; | |
304 | io_ctl->orig = NULL; | |
305 | } | |
306 | } | |
307 | ||
308 | static void io_ctl_map_page(struct io_ctl *io_ctl, int clear) | |
309 | { | |
310 | WARN_ON(io_ctl->cur); | |
311 | BUG_ON(io_ctl->index >= io_ctl->num_pages); | |
312 | io_ctl->page = io_ctl->pages[io_ctl->index++]; | |
313 | io_ctl->cur = kmap(io_ctl->page); | |
314 | io_ctl->orig = io_ctl->cur; | |
315 | io_ctl->size = PAGE_CACHE_SIZE; | |
316 | if (clear) | |
317 | memset(io_ctl->cur, 0, PAGE_CACHE_SIZE); | |
318 | } | |
319 | ||
320 | static void io_ctl_drop_pages(struct io_ctl *io_ctl) | |
321 | { | |
322 | int i; | |
323 | ||
324 | io_ctl_unmap_page(io_ctl); | |
325 | ||
326 | for (i = 0; i < io_ctl->num_pages; i++) { | |
a1ee5a45 LZ |
327 | if (io_ctl->pages[i]) { |
328 | ClearPageChecked(io_ctl->pages[i]); | |
329 | unlock_page(io_ctl->pages[i]); | |
330 | page_cache_release(io_ctl->pages[i]); | |
331 | } | |
a67509c3 JB |
332 | } |
333 | } | |
334 | ||
335 | static int io_ctl_prepare_pages(struct io_ctl *io_ctl, struct inode *inode, | |
336 | int uptodate) | |
337 | { | |
338 | struct page *page; | |
339 | gfp_t mask = btrfs_alloc_write_mask(inode->i_mapping); | |
340 | int i; | |
341 | ||
342 | for (i = 0; i < io_ctl->num_pages; i++) { | |
343 | page = find_or_create_page(inode->i_mapping, i, mask); | |
344 | if (!page) { | |
345 | io_ctl_drop_pages(io_ctl); | |
346 | return -ENOMEM; | |
347 | } | |
348 | io_ctl->pages[i] = page; | |
349 | if (uptodate && !PageUptodate(page)) { | |
350 | btrfs_readpage(NULL, page); | |
351 | lock_page(page); | |
352 | if (!PageUptodate(page)) { | |
353 | printk(KERN_ERR "btrfs: error reading free " | |
354 | "space cache\n"); | |
355 | io_ctl_drop_pages(io_ctl); | |
356 | return -EIO; | |
357 | } | |
358 | } | |
359 | } | |
360 | ||
f7d61dcd JB |
361 | for (i = 0; i < io_ctl->num_pages; i++) { |
362 | clear_page_dirty_for_io(io_ctl->pages[i]); | |
363 | set_page_extent_mapped(io_ctl->pages[i]); | |
364 | } | |
365 | ||
a67509c3 JB |
366 | return 0; |
367 | } | |
368 | ||
369 | static void io_ctl_set_generation(struct io_ctl *io_ctl, u64 generation) | |
370 | { | |
528c0327 | 371 | __le64 *val; |
a67509c3 JB |
372 | |
373 | io_ctl_map_page(io_ctl, 1); | |
374 | ||
375 | /* | |
5b0e95bf JB |
376 | * Skip the csum areas. If we don't check crcs then we just have a |
377 | * 64bit chunk at the front of the first page. | |
a67509c3 | 378 | */ |
5b0e95bf JB |
379 | if (io_ctl->check_crcs) { |
380 | io_ctl->cur += (sizeof(u32) * io_ctl->num_pages); | |
381 | io_ctl->size -= sizeof(u64) + (sizeof(u32) * io_ctl->num_pages); | |
382 | } else { | |
383 | io_ctl->cur += sizeof(u64); | |
384 | io_ctl->size -= sizeof(u64) * 2; | |
385 | } | |
a67509c3 JB |
386 | |
387 | val = io_ctl->cur; | |
388 | *val = cpu_to_le64(generation); | |
389 | io_ctl->cur += sizeof(u64); | |
a67509c3 JB |
390 | } |
391 | ||
392 | static int io_ctl_check_generation(struct io_ctl *io_ctl, u64 generation) | |
393 | { | |
528c0327 | 394 | __le64 *gen; |
a67509c3 | 395 | |
5b0e95bf JB |
396 | /* |
397 | * Skip the crc area. If we don't check crcs then we just have a 64bit | |
398 | * chunk at the front of the first page. | |
399 | */ | |
400 | if (io_ctl->check_crcs) { | |
401 | io_ctl->cur += sizeof(u32) * io_ctl->num_pages; | |
402 | io_ctl->size -= sizeof(u64) + | |
403 | (sizeof(u32) * io_ctl->num_pages); | |
404 | } else { | |
405 | io_ctl->cur += sizeof(u64); | |
406 | io_ctl->size -= sizeof(u64) * 2; | |
407 | } | |
a67509c3 | 408 | |
a67509c3 JB |
409 | gen = io_ctl->cur; |
410 | if (le64_to_cpu(*gen) != generation) { | |
411 | printk_ratelimited(KERN_ERR "btrfs: space cache generation " | |
412 | "(%Lu) does not match inode (%Lu)\n", *gen, | |
413 | generation); | |
414 | io_ctl_unmap_page(io_ctl); | |
415 | return -EIO; | |
416 | } | |
417 | io_ctl->cur += sizeof(u64); | |
5b0e95bf JB |
418 | return 0; |
419 | } | |
420 | ||
421 | static void io_ctl_set_crc(struct io_ctl *io_ctl, int index) | |
422 | { | |
423 | u32 *tmp; | |
424 | u32 crc = ~(u32)0; | |
425 | unsigned offset = 0; | |
426 | ||
427 | if (!io_ctl->check_crcs) { | |
428 | io_ctl_unmap_page(io_ctl); | |
429 | return; | |
430 | } | |
431 | ||
432 | if (index == 0) | |
cb54f257 | 433 | offset = sizeof(u32) * io_ctl->num_pages; |
5b0e95bf JB |
434 | |
435 | crc = btrfs_csum_data(io_ctl->root, io_ctl->orig + offset, crc, | |
436 | PAGE_CACHE_SIZE - offset); | |
437 | btrfs_csum_final(crc, (char *)&crc); | |
438 | io_ctl_unmap_page(io_ctl); | |
439 | tmp = kmap(io_ctl->pages[0]); | |
440 | tmp += index; | |
441 | *tmp = crc; | |
442 | kunmap(io_ctl->pages[0]); | |
443 | } | |
444 | ||
445 | static int io_ctl_check_crc(struct io_ctl *io_ctl, int index) | |
446 | { | |
447 | u32 *tmp, val; | |
448 | u32 crc = ~(u32)0; | |
449 | unsigned offset = 0; | |
450 | ||
451 | if (!io_ctl->check_crcs) { | |
452 | io_ctl_map_page(io_ctl, 0); | |
453 | return 0; | |
454 | } | |
455 | ||
456 | if (index == 0) | |
457 | offset = sizeof(u32) * io_ctl->num_pages; | |
458 | ||
459 | tmp = kmap(io_ctl->pages[0]); | |
460 | tmp += index; | |
461 | val = *tmp; | |
462 | kunmap(io_ctl->pages[0]); | |
463 | ||
464 | io_ctl_map_page(io_ctl, 0); | |
465 | crc = btrfs_csum_data(io_ctl->root, io_ctl->orig + offset, crc, | |
466 | PAGE_CACHE_SIZE - offset); | |
467 | btrfs_csum_final(crc, (char *)&crc); | |
468 | if (val != crc) { | |
469 | printk_ratelimited(KERN_ERR "btrfs: csum mismatch on free " | |
470 | "space cache\n"); | |
471 | io_ctl_unmap_page(io_ctl); | |
472 | return -EIO; | |
473 | } | |
474 | ||
a67509c3 JB |
475 | return 0; |
476 | } | |
477 | ||
478 | static int io_ctl_add_entry(struct io_ctl *io_ctl, u64 offset, u64 bytes, | |
479 | void *bitmap) | |
480 | { | |
481 | struct btrfs_free_space_entry *entry; | |
482 | ||
483 | if (!io_ctl->cur) | |
484 | return -ENOSPC; | |
485 | ||
486 | entry = io_ctl->cur; | |
487 | entry->offset = cpu_to_le64(offset); | |
488 | entry->bytes = cpu_to_le64(bytes); | |
489 | entry->type = (bitmap) ? BTRFS_FREE_SPACE_BITMAP : | |
490 | BTRFS_FREE_SPACE_EXTENT; | |
491 | io_ctl->cur += sizeof(struct btrfs_free_space_entry); | |
492 | io_ctl->size -= sizeof(struct btrfs_free_space_entry); | |
493 | ||
494 | if (io_ctl->size >= sizeof(struct btrfs_free_space_entry)) | |
495 | return 0; | |
496 | ||
5b0e95bf | 497 | io_ctl_set_crc(io_ctl, io_ctl->index - 1); |
a67509c3 JB |
498 | |
499 | /* No more pages to map */ | |
500 | if (io_ctl->index >= io_ctl->num_pages) | |
501 | return 0; | |
502 | ||
503 | /* map the next page */ | |
504 | io_ctl_map_page(io_ctl, 1); | |
505 | return 0; | |
506 | } | |
507 | ||
508 | static int io_ctl_add_bitmap(struct io_ctl *io_ctl, void *bitmap) | |
509 | { | |
510 | if (!io_ctl->cur) | |
511 | return -ENOSPC; | |
512 | ||
513 | /* | |
514 | * If we aren't at the start of the current page, unmap this one and | |
515 | * map the next one if there is any left. | |
516 | */ | |
517 | if (io_ctl->cur != io_ctl->orig) { | |
5b0e95bf | 518 | io_ctl_set_crc(io_ctl, io_ctl->index - 1); |
a67509c3 JB |
519 | if (io_ctl->index >= io_ctl->num_pages) |
520 | return -ENOSPC; | |
521 | io_ctl_map_page(io_ctl, 0); | |
522 | } | |
523 | ||
524 | memcpy(io_ctl->cur, bitmap, PAGE_CACHE_SIZE); | |
5b0e95bf | 525 | io_ctl_set_crc(io_ctl, io_ctl->index - 1); |
a67509c3 JB |
526 | if (io_ctl->index < io_ctl->num_pages) |
527 | io_ctl_map_page(io_ctl, 0); | |
528 | return 0; | |
529 | } | |
530 | ||
531 | static void io_ctl_zero_remaining_pages(struct io_ctl *io_ctl) | |
532 | { | |
5b0e95bf JB |
533 | /* |
534 | * If we're not on the boundary we know we've modified the page and we | |
535 | * need to crc the page. | |
536 | */ | |
537 | if (io_ctl->cur != io_ctl->orig) | |
538 | io_ctl_set_crc(io_ctl, io_ctl->index - 1); | |
539 | else | |
540 | io_ctl_unmap_page(io_ctl); | |
a67509c3 JB |
541 | |
542 | while (io_ctl->index < io_ctl->num_pages) { | |
543 | io_ctl_map_page(io_ctl, 1); | |
5b0e95bf | 544 | io_ctl_set_crc(io_ctl, io_ctl->index - 1); |
a67509c3 JB |
545 | } |
546 | } | |
547 | ||
5b0e95bf JB |
548 | static int io_ctl_read_entry(struct io_ctl *io_ctl, |
549 | struct btrfs_free_space *entry, u8 *type) | |
a67509c3 JB |
550 | { |
551 | struct btrfs_free_space_entry *e; | |
2f120c05 JB |
552 | int ret; |
553 | ||
554 | if (!io_ctl->cur) { | |
555 | ret = io_ctl_check_crc(io_ctl, io_ctl->index); | |
556 | if (ret) | |
557 | return ret; | |
558 | } | |
a67509c3 JB |
559 | |
560 | e = io_ctl->cur; | |
561 | entry->offset = le64_to_cpu(e->offset); | |
562 | entry->bytes = le64_to_cpu(e->bytes); | |
5b0e95bf | 563 | *type = e->type; |
a67509c3 JB |
564 | io_ctl->cur += sizeof(struct btrfs_free_space_entry); |
565 | io_ctl->size -= sizeof(struct btrfs_free_space_entry); | |
566 | ||
567 | if (io_ctl->size >= sizeof(struct btrfs_free_space_entry)) | |
5b0e95bf | 568 | return 0; |
a67509c3 JB |
569 | |
570 | io_ctl_unmap_page(io_ctl); | |
571 | ||
2f120c05 | 572 | return 0; |
a67509c3 JB |
573 | } |
574 | ||
5b0e95bf JB |
575 | static int io_ctl_read_bitmap(struct io_ctl *io_ctl, |
576 | struct btrfs_free_space *entry) | |
a67509c3 | 577 | { |
5b0e95bf JB |
578 | int ret; |
579 | ||
5b0e95bf JB |
580 | ret = io_ctl_check_crc(io_ctl, io_ctl->index); |
581 | if (ret) | |
582 | return ret; | |
583 | ||
a67509c3 JB |
584 | memcpy(entry->bitmap, io_ctl->cur, PAGE_CACHE_SIZE); |
585 | io_ctl_unmap_page(io_ctl); | |
5b0e95bf JB |
586 | |
587 | return 0; | |
a67509c3 JB |
588 | } |
589 | ||
cd023e7b JB |
590 | /* |
591 | * Since we attach pinned extents after the fact we can have contiguous sections | |
592 | * of free space that are split up in entries. This poses a problem with the | |
593 | * tree logging stuff since it could have allocated across what appears to be 2 | |
594 | * entries since we would have merged the entries when adding the pinned extents | |
595 | * back to the free space cache. So run through the space cache that we just | |
596 | * loaded and merge contiguous entries. This will make the log replay stuff not | |
597 | * blow up and it will make for nicer allocator behavior. | |
598 | */ | |
599 | static void merge_space_tree(struct btrfs_free_space_ctl *ctl) | |
600 | { | |
601 | struct btrfs_free_space *e, *prev = NULL; | |
602 | struct rb_node *n; | |
603 | ||
604 | again: | |
605 | spin_lock(&ctl->tree_lock); | |
606 | for (n = rb_first(&ctl->free_space_offset); n; n = rb_next(n)) { | |
607 | e = rb_entry(n, struct btrfs_free_space, offset_index); | |
608 | if (!prev) | |
609 | goto next; | |
610 | if (e->bitmap || prev->bitmap) | |
611 | goto next; | |
612 | if (prev->offset + prev->bytes == e->offset) { | |
613 | unlink_free_space(ctl, prev); | |
614 | unlink_free_space(ctl, e); | |
615 | prev->bytes += e->bytes; | |
616 | kmem_cache_free(btrfs_free_space_cachep, e); | |
617 | link_free_space(ctl, prev); | |
618 | prev = NULL; | |
619 | spin_unlock(&ctl->tree_lock); | |
620 | goto again; | |
621 | } | |
622 | next: | |
623 | prev = e; | |
624 | } | |
625 | spin_unlock(&ctl->tree_lock); | |
626 | } | |
627 | ||
0414efae LZ |
628 | int __load_free_space_cache(struct btrfs_root *root, struct inode *inode, |
629 | struct btrfs_free_space_ctl *ctl, | |
630 | struct btrfs_path *path, u64 offset) | |
9d66e233 | 631 | { |
9d66e233 JB |
632 | struct btrfs_free_space_header *header; |
633 | struct extent_buffer *leaf; | |
a67509c3 | 634 | struct io_ctl io_ctl; |
9d66e233 | 635 | struct btrfs_key key; |
a67509c3 | 636 | struct btrfs_free_space *e, *n; |
9d66e233 JB |
637 | struct list_head bitmaps; |
638 | u64 num_entries; | |
639 | u64 num_bitmaps; | |
640 | u64 generation; | |
a67509c3 | 641 | u8 type; |
f6a39829 | 642 | int ret = 0; |
9d66e233 JB |
643 | |
644 | INIT_LIST_HEAD(&bitmaps); | |
645 | ||
9d66e233 | 646 | /* Nothing in the space cache, goodbye */ |
0414efae | 647 | if (!i_size_read(inode)) |
a67509c3 | 648 | return 0; |
9d66e233 JB |
649 | |
650 | key.objectid = BTRFS_FREE_SPACE_OBJECTID; | |
0414efae | 651 | key.offset = offset; |
9d66e233 JB |
652 | key.type = 0; |
653 | ||
654 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); | |
0414efae | 655 | if (ret < 0) |
a67509c3 | 656 | return 0; |
0414efae | 657 | else if (ret > 0) { |
945d8962 | 658 | btrfs_release_path(path); |
a67509c3 | 659 | return 0; |
9d66e233 JB |
660 | } |
661 | ||
0414efae LZ |
662 | ret = -1; |
663 | ||
9d66e233 JB |
664 | leaf = path->nodes[0]; |
665 | header = btrfs_item_ptr(leaf, path->slots[0], | |
666 | struct btrfs_free_space_header); | |
667 | num_entries = btrfs_free_space_entries(leaf, header); | |
668 | num_bitmaps = btrfs_free_space_bitmaps(leaf, header); | |
669 | generation = btrfs_free_space_generation(leaf, header); | |
945d8962 | 670 | btrfs_release_path(path); |
9d66e233 JB |
671 | |
672 | if (BTRFS_I(inode)->generation != generation) { | |
673 | printk(KERN_ERR "btrfs: free space inode generation (%llu) did" | |
0414efae | 674 | " not match free space cache generation (%llu)\n", |
9d66e233 | 675 | (unsigned long long)BTRFS_I(inode)->generation, |
0414efae | 676 | (unsigned long long)generation); |
a67509c3 | 677 | return 0; |
9d66e233 JB |
678 | } |
679 | ||
680 | if (!num_entries) | |
a67509c3 | 681 | return 0; |
9d66e233 | 682 | |
706efc66 LZ |
683 | ret = io_ctl_init(&io_ctl, inode, root); |
684 | if (ret) | |
685 | return ret; | |
686 | ||
9d66e233 | 687 | ret = readahead_cache(inode); |
0414efae | 688 | if (ret) |
9d66e233 | 689 | goto out; |
9d66e233 | 690 | |
a67509c3 JB |
691 | ret = io_ctl_prepare_pages(&io_ctl, inode, 1); |
692 | if (ret) | |
693 | goto out; | |
9d66e233 | 694 | |
5b0e95bf JB |
695 | ret = io_ctl_check_crc(&io_ctl, 0); |
696 | if (ret) | |
697 | goto free_cache; | |
698 | ||
a67509c3 JB |
699 | ret = io_ctl_check_generation(&io_ctl, generation); |
700 | if (ret) | |
701 | goto free_cache; | |
9d66e233 | 702 | |
a67509c3 JB |
703 | while (num_entries) { |
704 | e = kmem_cache_zalloc(btrfs_free_space_cachep, | |
705 | GFP_NOFS); | |
706 | if (!e) | |
9d66e233 | 707 | goto free_cache; |
9d66e233 | 708 | |
5b0e95bf JB |
709 | ret = io_ctl_read_entry(&io_ctl, e, &type); |
710 | if (ret) { | |
711 | kmem_cache_free(btrfs_free_space_cachep, e); | |
712 | goto free_cache; | |
713 | } | |
714 | ||
a67509c3 JB |
715 | if (!e->bytes) { |
716 | kmem_cache_free(btrfs_free_space_cachep, e); | |
717 | goto free_cache; | |
9d66e233 | 718 | } |
a67509c3 JB |
719 | |
720 | if (type == BTRFS_FREE_SPACE_EXTENT) { | |
721 | spin_lock(&ctl->tree_lock); | |
722 | ret = link_free_space(ctl, e); | |
723 | spin_unlock(&ctl->tree_lock); | |
724 | if (ret) { | |
725 | printk(KERN_ERR "Duplicate entries in " | |
726 | "free space cache, dumping\n"); | |
727 | kmem_cache_free(btrfs_free_space_cachep, e); | |
9d66e233 JB |
728 | goto free_cache; |
729 | } | |
a67509c3 JB |
730 | } else { |
731 | BUG_ON(!num_bitmaps); | |
732 | num_bitmaps--; | |
733 | e->bitmap = kzalloc(PAGE_CACHE_SIZE, GFP_NOFS); | |
734 | if (!e->bitmap) { | |
735 | kmem_cache_free( | |
736 | btrfs_free_space_cachep, e); | |
9d66e233 JB |
737 | goto free_cache; |
738 | } | |
a67509c3 JB |
739 | spin_lock(&ctl->tree_lock); |
740 | ret = link_free_space(ctl, e); | |
741 | ctl->total_bitmaps++; | |
742 | ctl->op->recalc_thresholds(ctl); | |
743 | spin_unlock(&ctl->tree_lock); | |
744 | if (ret) { | |
745 | printk(KERN_ERR "Duplicate entries in " | |
746 | "free space cache, dumping\n"); | |
dc89e982 | 747 | kmem_cache_free(btrfs_free_space_cachep, e); |
9d66e233 JB |
748 | goto free_cache; |
749 | } | |
a67509c3 | 750 | list_add_tail(&e->list, &bitmaps); |
9d66e233 JB |
751 | } |
752 | ||
a67509c3 JB |
753 | num_entries--; |
754 | } | |
9d66e233 | 755 | |
2f120c05 JB |
756 | io_ctl_unmap_page(&io_ctl); |
757 | ||
a67509c3 JB |
758 | /* |
759 | * We add the bitmaps at the end of the entries in order that | |
760 | * the bitmap entries are added to the cache. | |
761 | */ | |
762 | list_for_each_entry_safe(e, n, &bitmaps, list) { | |
9d66e233 | 763 | list_del_init(&e->list); |
5b0e95bf JB |
764 | ret = io_ctl_read_bitmap(&io_ctl, e); |
765 | if (ret) | |
766 | goto free_cache; | |
9d66e233 JB |
767 | } |
768 | ||
a67509c3 | 769 | io_ctl_drop_pages(&io_ctl); |
cd023e7b | 770 | merge_space_tree(ctl); |
9d66e233 JB |
771 | ret = 1; |
772 | out: | |
a67509c3 | 773 | io_ctl_free(&io_ctl); |
9d66e233 | 774 | return ret; |
9d66e233 | 775 | free_cache: |
a67509c3 | 776 | io_ctl_drop_pages(&io_ctl); |
0414efae | 777 | __btrfs_remove_free_space_cache(ctl); |
9d66e233 JB |
778 | goto out; |
779 | } | |
780 | ||
0414efae LZ |
781 | int load_free_space_cache(struct btrfs_fs_info *fs_info, |
782 | struct btrfs_block_group_cache *block_group) | |
0cb59c99 | 783 | { |
34d52cb6 | 784 | struct btrfs_free_space_ctl *ctl = block_group->free_space_ctl; |
0414efae LZ |
785 | struct btrfs_root *root = fs_info->tree_root; |
786 | struct inode *inode; | |
787 | struct btrfs_path *path; | |
5b0e95bf | 788 | int ret = 0; |
0414efae LZ |
789 | bool matched; |
790 | u64 used = btrfs_block_group_used(&block_group->item); | |
791 | ||
0414efae LZ |
792 | /* |
793 | * If this block group has been marked to be cleared for one reason or | |
794 | * another then we can't trust the on disk cache, so just return. | |
795 | */ | |
9d66e233 | 796 | spin_lock(&block_group->lock); |
0414efae LZ |
797 | if (block_group->disk_cache_state != BTRFS_DC_WRITTEN) { |
798 | spin_unlock(&block_group->lock); | |
799 | return 0; | |
800 | } | |
9d66e233 | 801 | spin_unlock(&block_group->lock); |
0414efae LZ |
802 | |
803 | path = btrfs_alloc_path(); | |
804 | if (!path) | |
805 | return 0; | |
d53ba474 JB |
806 | path->search_commit_root = 1; |
807 | path->skip_locking = 1; | |
0414efae LZ |
808 | |
809 | inode = lookup_free_space_inode(root, block_group, path); | |
810 | if (IS_ERR(inode)) { | |
811 | btrfs_free_path(path); | |
812 | return 0; | |
813 | } | |
814 | ||
5b0e95bf JB |
815 | /* We may have converted the inode and made the cache invalid. */ |
816 | spin_lock(&block_group->lock); | |
817 | if (block_group->disk_cache_state != BTRFS_DC_WRITTEN) { | |
818 | spin_unlock(&block_group->lock); | |
a7e221e9 | 819 | btrfs_free_path(path); |
5b0e95bf JB |
820 | goto out; |
821 | } | |
822 | spin_unlock(&block_group->lock); | |
823 | ||
0414efae LZ |
824 | ret = __load_free_space_cache(fs_info->tree_root, inode, ctl, |
825 | path, block_group->key.objectid); | |
826 | btrfs_free_path(path); | |
827 | if (ret <= 0) | |
828 | goto out; | |
829 | ||
830 | spin_lock(&ctl->tree_lock); | |
831 | matched = (ctl->free_space == (block_group->key.offset - used - | |
832 | block_group->bytes_super)); | |
833 | spin_unlock(&ctl->tree_lock); | |
834 | ||
835 | if (!matched) { | |
836 | __btrfs_remove_free_space_cache(ctl); | |
837 | printk(KERN_ERR "block group %llu has an wrong amount of free " | |
838 | "space\n", block_group->key.objectid); | |
839 | ret = -1; | |
840 | } | |
841 | out: | |
842 | if (ret < 0) { | |
843 | /* This cache is bogus, make sure it gets cleared */ | |
844 | spin_lock(&block_group->lock); | |
845 | block_group->disk_cache_state = BTRFS_DC_CLEAR; | |
846 | spin_unlock(&block_group->lock); | |
82d5902d | 847 | ret = 0; |
0414efae LZ |
848 | |
849 | printk(KERN_ERR "btrfs: failed to load free space cache " | |
850 | "for block group %llu\n", block_group->key.objectid); | |
851 | } | |
852 | ||
853 | iput(inode); | |
854 | return ret; | |
9d66e233 JB |
855 | } |
856 | ||
c09544e0 JB |
857 | /** |
858 | * __btrfs_write_out_cache - write out cached info to an inode | |
859 | * @root - the root the inode belongs to | |
860 | * @ctl - the free space cache we are going to write out | |
861 | * @block_group - the block_group for this cache if it belongs to a block_group | |
862 | * @trans - the trans handle | |
863 | * @path - the path to use | |
864 | * @offset - the offset for the key we'll insert | |
865 | * | |
866 | * This function writes out a free space cache struct to disk for quick recovery | |
867 | * on mount. This will return 0 if it was successfull in writing the cache out, | |
868 | * and -1 if it was not. | |
869 | */ | |
0414efae LZ |
870 | int __btrfs_write_out_cache(struct btrfs_root *root, struct inode *inode, |
871 | struct btrfs_free_space_ctl *ctl, | |
872 | struct btrfs_block_group_cache *block_group, | |
873 | struct btrfs_trans_handle *trans, | |
874 | struct btrfs_path *path, u64 offset) | |
0cb59c99 JB |
875 | { |
876 | struct btrfs_free_space_header *header; | |
877 | struct extent_buffer *leaf; | |
0cb59c99 JB |
878 | struct rb_node *node; |
879 | struct list_head *pos, *n; | |
0cb59c99 | 880 | struct extent_state *cached_state = NULL; |
43be2146 JB |
881 | struct btrfs_free_cluster *cluster = NULL; |
882 | struct extent_io_tree *unpin = NULL; | |
a67509c3 | 883 | struct io_ctl io_ctl; |
0cb59c99 JB |
884 | struct list_head bitmap_list; |
885 | struct btrfs_key key; | |
db804f23 | 886 | u64 start, extent_start, extent_end, len; |
0cb59c99 JB |
887 | int entries = 0; |
888 | int bitmaps = 0; | |
c09544e0 JB |
889 | int ret; |
890 | int err = -1; | |
0cb59c99 | 891 | |
0cb59c99 JB |
892 | INIT_LIST_HEAD(&bitmap_list); |
893 | ||
0414efae LZ |
894 | if (!i_size_read(inode)) |
895 | return -1; | |
2b20982e | 896 | |
706efc66 LZ |
897 | ret = io_ctl_init(&io_ctl, inode, root); |
898 | if (ret) | |
899 | return -1; | |
be1a12a0 | 900 | |
43be2146 | 901 | /* Get the cluster for this block_group if it exists */ |
0414efae | 902 | if (block_group && !list_empty(&block_group->cluster_list)) |
43be2146 JB |
903 | cluster = list_entry(block_group->cluster_list.next, |
904 | struct btrfs_free_cluster, | |
905 | block_group_list); | |
906 | ||
a67509c3 JB |
907 | /* Lock all pages first so we can lock the extent safely. */ |
908 | io_ctl_prepare_pages(&io_ctl, inode, 0); | |
0cb59c99 | 909 | |
0cb59c99 | 910 | lock_extent_bits(&BTRFS_I(inode)->io_tree, 0, i_size_read(inode) - 1, |
d0082371 | 911 | 0, &cached_state); |
0cb59c99 | 912 | |
f75b130e JB |
913 | node = rb_first(&ctl->free_space_offset); |
914 | if (!node && cluster) { | |
915 | node = rb_first(&cluster->root); | |
916 | cluster = NULL; | |
917 | } | |
918 | ||
5b0e95bf JB |
919 | /* Make sure we can fit our crcs into the first page */ |
920 | if (io_ctl.check_crcs && | |
921 | (io_ctl.num_pages * sizeof(u32)) >= PAGE_CACHE_SIZE) { | |
922 | WARN_ON(1); | |
923 | goto out_nospc; | |
924 | } | |
925 | ||
a67509c3 | 926 | io_ctl_set_generation(&io_ctl, trans->transid); |
43be2146 | 927 | |
a67509c3 JB |
928 | /* Write out the extent entries */ |
929 | while (node) { | |
930 | struct btrfs_free_space *e; | |
0cb59c99 | 931 | |
a67509c3 JB |
932 | e = rb_entry(node, struct btrfs_free_space, offset_index); |
933 | entries++; | |
0cb59c99 | 934 | |
a67509c3 JB |
935 | ret = io_ctl_add_entry(&io_ctl, e->offset, e->bytes, |
936 | e->bitmap); | |
937 | if (ret) | |
938 | goto out_nospc; | |
2f356126 | 939 | |
a67509c3 JB |
940 | if (e->bitmap) { |
941 | list_add_tail(&e->list, &bitmap_list); | |
942 | bitmaps++; | |
2f356126 | 943 | } |
a67509c3 JB |
944 | node = rb_next(node); |
945 | if (!node && cluster) { | |
946 | node = rb_first(&cluster->root); | |
947 | cluster = NULL; | |
43be2146 | 948 | } |
a67509c3 | 949 | } |
43be2146 | 950 | |
a67509c3 JB |
951 | /* |
952 | * We want to add any pinned extents to our free space cache | |
953 | * so we don't leak the space | |
954 | */ | |
db804f23 LZ |
955 | |
956 | /* | |
957 | * We shouldn't have switched the pinned extents yet so this is the | |
958 | * right one | |
959 | */ | |
960 | unpin = root->fs_info->pinned_extents; | |
961 | ||
962 | if (block_group) | |
963 | start = block_group->key.objectid; | |
964 | ||
a67509c3 JB |
965 | while (block_group && (start < block_group->key.objectid + |
966 | block_group->key.offset)) { | |
db804f23 LZ |
967 | ret = find_first_extent_bit(unpin, start, |
968 | &extent_start, &extent_end, | |
a67509c3 JB |
969 | EXTENT_DIRTY); |
970 | if (ret) { | |
971 | ret = 0; | |
972 | break; | |
0cb59c99 | 973 | } |
0cb59c99 | 974 | |
a67509c3 | 975 | /* This pinned extent is out of our range */ |
db804f23 | 976 | if (extent_start >= block_group->key.objectid + |
a67509c3 JB |
977 | block_group->key.offset) |
978 | break; | |
2f356126 | 979 | |
db804f23 LZ |
980 | extent_start = max(extent_start, start); |
981 | extent_end = min(block_group->key.objectid + | |
982 | block_group->key.offset, extent_end + 1); | |
983 | len = extent_end - extent_start; | |
0cb59c99 | 984 | |
a67509c3 | 985 | entries++; |
db804f23 | 986 | ret = io_ctl_add_entry(&io_ctl, extent_start, len, NULL); |
a67509c3 JB |
987 | if (ret) |
988 | goto out_nospc; | |
0cb59c99 | 989 | |
db804f23 | 990 | start = extent_end; |
a67509c3 | 991 | } |
0cb59c99 JB |
992 | |
993 | /* Write out the bitmaps */ | |
994 | list_for_each_safe(pos, n, &bitmap_list) { | |
0cb59c99 JB |
995 | struct btrfs_free_space *entry = |
996 | list_entry(pos, struct btrfs_free_space, list); | |
997 | ||
a67509c3 JB |
998 | ret = io_ctl_add_bitmap(&io_ctl, entry->bitmap); |
999 | if (ret) | |
1000 | goto out_nospc; | |
0cb59c99 | 1001 | list_del_init(&entry->list); |
be1a12a0 JB |
1002 | } |
1003 | ||
0cb59c99 | 1004 | /* Zero out the rest of the pages just to make sure */ |
a67509c3 | 1005 | io_ctl_zero_remaining_pages(&io_ctl); |
0cb59c99 | 1006 | |
a67509c3 JB |
1007 | ret = btrfs_dirty_pages(root, inode, io_ctl.pages, io_ctl.num_pages, |
1008 | 0, i_size_read(inode), &cached_state); | |
1009 | io_ctl_drop_pages(&io_ctl); | |
0cb59c99 JB |
1010 | unlock_extent_cached(&BTRFS_I(inode)->io_tree, 0, |
1011 | i_size_read(inode) - 1, &cached_state, GFP_NOFS); | |
1012 | ||
c09544e0 | 1013 | if (ret) |
2f356126 | 1014 | goto out; |
be1a12a0 | 1015 | |
be1a12a0 | 1016 | |
5fd02043 | 1017 | btrfs_wait_ordered_range(inode, 0, (u64)-1); |
0cb59c99 JB |
1018 | |
1019 | key.objectid = BTRFS_FREE_SPACE_OBJECTID; | |
0414efae | 1020 | key.offset = offset; |
0cb59c99 JB |
1021 | key.type = 0; |
1022 | ||
a9b5fcdd | 1023 | ret = btrfs_search_slot(trans, root, &key, path, 0, 1); |
0cb59c99 | 1024 | if (ret < 0) { |
a67509c3 | 1025 | clear_extent_bit(&BTRFS_I(inode)->io_tree, 0, inode->i_size - 1, |
5b0e95bf JB |
1026 | EXTENT_DIRTY | EXTENT_DELALLOC, 0, 0, NULL, |
1027 | GFP_NOFS); | |
2f356126 | 1028 | goto out; |
0cb59c99 JB |
1029 | } |
1030 | leaf = path->nodes[0]; | |
1031 | if (ret > 0) { | |
1032 | struct btrfs_key found_key; | |
1033 | BUG_ON(!path->slots[0]); | |
1034 | path->slots[0]--; | |
1035 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); | |
1036 | if (found_key.objectid != BTRFS_FREE_SPACE_OBJECTID || | |
0414efae | 1037 | found_key.offset != offset) { |
a67509c3 JB |
1038 | clear_extent_bit(&BTRFS_I(inode)->io_tree, 0, |
1039 | inode->i_size - 1, | |
5b0e95bf JB |
1040 | EXTENT_DIRTY | EXTENT_DELALLOC, 0, 0, |
1041 | NULL, GFP_NOFS); | |
b3b4aa74 | 1042 | btrfs_release_path(path); |
2f356126 | 1043 | goto out; |
0cb59c99 JB |
1044 | } |
1045 | } | |
549b4fdb JB |
1046 | |
1047 | BTRFS_I(inode)->generation = trans->transid; | |
0cb59c99 JB |
1048 | header = btrfs_item_ptr(leaf, path->slots[0], |
1049 | struct btrfs_free_space_header); | |
1050 | btrfs_set_free_space_entries(leaf, header, entries); | |
1051 | btrfs_set_free_space_bitmaps(leaf, header, bitmaps); | |
1052 | btrfs_set_free_space_generation(leaf, header, trans->transid); | |
1053 | btrfs_mark_buffer_dirty(leaf); | |
b3b4aa74 | 1054 | btrfs_release_path(path); |
0cb59c99 | 1055 | |
c09544e0 | 1056 | err = 0; |
2f356126 | 1057 | out: |
a67509c3 | 1058 | io_ctl_free(&io_ctl); |
c09544e0 | 1059 | if (err) { |
a67509c3 | 1060 | invalidate_inode_pages2(inode->i_mapping); |
0cb59c99 JB |
1061 | BTRFS_I(inode)->generation = 0; |
1062 | } | |
0cb59c99 | 1063 | btrfs_update_inode(trans, root, inode); |
c09544e0 | 1064 | return err; |
a67509c3 JB |
1065 | |
1066 | out_nospc: | |
1067 | list_for_each_safe(pos, n, &bitmap_list) { | |
1068 | struct btrfs_free_space *entry = | |
1069 | list_entry(pos, struct btrfs_free_space, list); | |
1070 | list_del_init(&entry->list); | |
1071 | } | |
1072 | io_ctl_drop_pages(&io_ctl); | |
1073 | unlock_extent_cached(&BTRFS_I(inode)->io_tree, 0, | |
1074 | i_size_read(inode) - 1, &cached_state, GFP_NOFS); | |
1075 | goto out; | |
0414efae LZ |
1076 | } |
1077 | ||
1078 | int btrfs_write_out_cache(struct btrfs_root *root, | |
1079 | struct btrfs_trans_handle *trans, | |
1080 | struct btrfs_block_group_cache *block_group, | |
1081 | struct btrfs_path *path) | |
1082 | { | |
1083 | struct btrfs_free_space_ctl *ctl = block_group->free_space_ctl; | |
1084 | struct inode *inode; | |
1085 | int ret = 0; | |
1086 | ||
1087 | root = root->fs_info->tree_root; | |
1088 | ||
1089 | spin_lock(&block_group->lock); | |
1090 | if (block_group->disk_cache_state < BTRFS_DC_SETUP) { | |
1091 | spin_unlock(&block_group->lock); | |
1092 | return 0; | |
1093 | } | |
1094 | spin_unlock(&block_group->lock); | |
1095 | ||
1096 | inode = lookup_free_space_inode(root, block_group, path); | |
1097 | if (IS_ERR(inode)) | |
1098 | return 0; | |
1099 | ||
1100 | ret = __btrfs_write_out_cache(root, inode, ctl, block_group, trans, | |
1101 | path, block_group->key.objectid); | |
c09544e0 | 1102 | if (ret) { |
0414efae LZ |
1103 | spin_lock(&block_group->lock); |
1104 | block_group->disk_cache_state = BTRFS_DC_ERROR; | |
1105 | spin_unlock(&block_group->lock); | |
82d5902d | 1106 | ret = 0; |
c09544e0 | 1107 | #ifdef DEBUG |
934e7d44 | 1108 | printk(KERN_ERR "btrfs: failed to write free space cache " |
0414efae | 1109 | "for block group %llu\n", block_group->key.objectid); |
c09544e0 | 1110 | #endif |
0414efae LZ |
1111 | } |
1112 | ||
0cb59c99 JB |
1113 | iput(inode); |
1114 | return ret; | |
1115 | } | |
1116 | ||
34d52cb6 | 1117 | static inline unsigned long offset_to_bit(u64 bitmap_start, u32 unit, |
96303081 | 1118 | u64 offset) |
0f9dd46c | 1119 | { |
96303081 JB |
1120 | BUG_ON(offset < bitmap_start); |
1121 | offset -= bitmap_start; | |
34d52cb6 | 1122 | return (unsigned long)(div_u64(offset, unit)); |
96303081 | 1123 | } |
0f9dd46c | 1124 | |
34d52cb6 | 1125 | static inline unsigned long bytes_to_bits(u64 bytes, u32 unit) |
96303081 | 1126 | { |
34d52cb6 | 1127 | return (unsigned long)(div_u64(bytes, unit)); |
96303081 | 1128 | } |
0f9dd46c | 1129 | |
34d52cb6 | 1130 | static inline u64 offset_to_bitmap(struct btrfs_free_space_ctl *ctl, |
96303081 JB |
1131 | u64 offset) |
1132 | { | |
1133 | u64 bitmap_start; | |
1134 | u64 bytes_per_bitmap; | |
0f9dd46c | 1135 | |
34d52cb6 LZ |
1136 | bytes_per_bitmap = BITS_PER_BITMAP * ctl->unit; |
1137 | bitmap_start = offset - ctl->start; | |
96303081 JB |
1138 | bitmap_start = div64_u64(bitmap_start, bytes_per_bitmap); |
1139 | bitmap_start *= bytes_per_bitmap; | |
34d52cb6 | 1140 | bitmap_start += ctl->start; |
0f9dd46c | 1141 | |
96303081 | 1142 | return bitmap_start; |
0f9dd46c JB |
1143 | } |
1144 | ||
96303081 JB |
1145 | static int tree_insert_offset(struct rb_root *root, u64 offset, |
1146 | struct rb_node *node, int bitmap) | |
0f9dd46c JB |
1147 | { |
1148 | struct rb_node **p = &root->rb_node; | |
1149 | struct rb_node *parent = NULL; | |
1150 | struct btrfs_free_space *info; | |
1151 | ||
1152 | while (*p) { | |
1153 | parent = *p; | |
96303081 | 1154 | info = rb_entry(parent, struct btrfs_free_space, offset_index); |
0f9dd46c | 1155 | |
96303081 | 1156 | if (offset < info->offset) { |
0f9dd46c | 1157 | p = &(*p)->rb_left; |
96303081 | 1158 | } else if (offset > info->offset) { |
0f9dd46c | 1159 | p = &(*p)->rb_right; |
96303081 JB |
1160 | } else { |
1161 | /* | |
1162 | * we could have a bitmap entry and an extent entry | |
1163 | * share the same offset. If this is the case, we want | |
1164 | * the extent entry to always be found first if we do a | |
1165 | * linear search through the tree, since we want to have | |
1166 | * the quickest allocation time, and allocating from an | |
1167 | * extent is faster than allocating from a bitmap. So | |
1168 | * if we're inserting a bitmap and we find an entry at | |
1169 | * this offset, we want to go right, or after this entry | |
1170 | * logically. If we are inserting an extent and we've | |
1171 | * found a bitmap, we want to go left, or before | |
1172 | * logically. | |
1173 | */ | |
1174 | if (bitmap) { | |
207dde82 JB |
1175 | if (info->bitmap) { |
1176 | WARN_ON_ONCE(1); | |
1177 | return -EEXIST; | |
1178 | } | |
96303081 JB |
1179 | p = &(*p)->rb_right; |
1180 | } else { | |
207dde82 JB |
1181 | if (!info->bitmap) { |
1182 | WARN_ON_ONCE(1); | |
1183 | return -EEXIST; | |
1184 | } | |
96303081 JB |
1185 | p = &(*p)->rb_left; |
1186 | } | |
1187 | } | |
0f9dd46c JB |
1188 | } |
1189 | ||
1190 | rb_link_node(node, parent, p); | |
1191 | rb_insert_color(node, root); | |
1192 | ||
1193 | return 0; | |
1194 | } | |
1195 | ||
1196 | /* | |
70cb0743 JB |
1197 | * searches the tree for the given offset. |
1198 | * | |
96303081 JB |
1199 | * fuzzy - If this is set, then we are trying to make an allocation, and we just |
1200 | * want a section that has at least bytes size and comes at or after the given | |
1201 | * offset. | |
0f9dd46c | 1202 | */ |
96303081 | 1203 | static struct btrfs_free_space * |
34d52cb6 | 1204 | tree_search_offset(struct btrfs_free_space_ctl *ctl, |
96303081 | 1205 | u64 offset, int bitmap_only, int fuzzy) |
0f9dd46c | 1206 | { |
34d52cb6 | 1207 | struct rb_node *n = ctl->free_space_offset.rb_node; |
96303081 JB |
1208 | struct btrfs_free_space *entry, *prev = NULL; |
1209 | ||
1210 | /* find entry that is closest to the 'offset' */ | |
1211 | while (1) { | |
1212 | if (!n) { | |
1213 | entry = NULL; | |
1214 | break; | |
1215 | } | |
0f9dd46c | 1216 | |
0f9dd46c | 1217 | entry = rb_entry(n, struct btrfs_free_space, offset_index); |
96303081 | 1218 | prev = entry; |
0f9dd46c | 1219 | |
96303081 | 1220 | if (offset < entry->offset) |
0f9dd46c | 1221 | n = n->rb_left; |
96303081 | 1222 | else if (offset > entry->offset) |
0f9dd46c | 1223 | n = n->rb_right; |
96303081 | 1224 | else |
0f9dd46c | 1225 | break; |
0f9dd46c JB |
1226 | } |
1227 | ||
96303081 JB |
1228 | if (bitmap_only) { |
1229 | if (!entry) | |
1230 | return NULL; | |
1231 | if (entry->bitmap) | |
1232 | return entry; | |
0f9dd46c | 1233 | |
96303081 JB |
1234 | /* |
1235 | * bitmap entry and extent entry may share same offset, | |
1236 | * in that case, bitmap entry comes after extent entry. | |
1237 | */ | |
1238 | n = rb_next(n); | |
1239 | if (!n) | |
1240 | return NULL; | |
1241 | entry = rb_entry(n, struct btrfs_free_space, offset_index); | |
1242 | if (entry->offset != offset) | |
1243 | return NULL; | |
0f9dd46c | 1244 | |
96303081 JB |
1245 | WARN_ON(!entry->bitmap); |
1246 | return entry; | |
1247 | } else if (entry) { | |
1248 | if (entry->bitmap) { | |
0f9dd46c | 1249 | /* |
96303081 JB |
1250 | * if previous extent entry covers the offset, |
1251 | * we should return it instead of the bitmap entry | |
0f9dd46c | 1252 | */ |
96303081 JB |
1253 | n = &entry->offset_index; |
1254 | while (1) { | |
1255 | n = rb_prev(n); | |
1256 | if (!n) | |
1257 | break; | |
1258 | prev = rb_entry(n, struct btrfs_free_space, | |
1259 | offset_index); | |
1260 | if (!prev->bitmap) { | |
1261 | if (prev->offset + prev->bytes > offset) | |
1262 | entry = prev; | |
1263 | break; | |
1264 | } | |
0f9dd46c | 1265 | } |
96303081 JB |
1266 | } |
1267 | return entry; | |
1268 | } | |
1269 | ||
1270 | if (!prev) | |
1271 | return NULL; | |
1272 | ||
1273 | /* find last entry before the 'offset' */ | |
1274 | entry = prev; | |
1275 | if (entry->offset > offset) { | |
1276 | n = rb_prev(&entry->offset_index); | |
1277 | if (n) { | |
1278 | entry = rb_entry(n, struct btrfs_free_space, | |
1279 | offset_index); | |
1280 | BUG_ON(entry->offset > offset); | |
0f9dd46c | 1281 | } else { |
96303081 JB |
1282 | if (fuzzy) |
1283 | return entry; | |
1284 | else | |
1285 | return NULL; | |
0f9dd46c JB |
1286 | } |
1287 | } | |
1288 | ||
96303081 JB |
1289 | if (entry->bitmap) { |
1290 | n = &entry->offset_index; | |
1291 | while (1) { | |
1292 | n = rb_prev(n); | |
1293 | if (!n) | |
1294 | break; | |
1295 | prev = rb_entry(n, struct btrfs_free_space, | |
1296 | offset_index); | |
1297 | if (!prev->bitmap) { | |
1298 | if (prev->offset + prev->bytes > offset) | |
1299 | return prev; | |
1300 | break; | |
1301 | } | |
1302 | } | |
34d52cb6 | 1303 | if (entry->offset + BITS_PER_BITMAP * ctl->unit > offset) |
96303081 JB |
1304 | return entry; |
1305 | } else if (entry->offset + entry->bytes > offset) | |
1306 | return entry; | |
1307 | ||
1308 | if (!fuzzy) | |
1309 | return NULL; | |
1310 | ||
1311 | while (1) { | |
1312 | if (entry->bitmap) { | |
1313 | if (entry->offset + BITS_PER_BITMAP * | |
34d52cb6 | 1314 | ctl->unit > offset) |
96303081 JB |
1315 | break; |
1316 | } else { | |
1317 | if (entry->offset + entry->bytes > offset) | |
1318 | break; | |
1319 | } | |
1320 | ||
1321 | n = rb_next(&entry->offset_index); | |
1322 | if (!n) | |
1323 | return NULL; | |
1324 | entry = rb_entry(n, struct btrfs_free_space, offset_index); | |
1325 | } | |
1326 | return entry; | |
0f9dd46c JB |
1327 | } |
1328 | ||
f333adb5 | 1329 | static inline void |
34d52cb6 | 1330 | __unlink_free_space(struct btrfs_free_space_ctl *ctl, |
f333adb5 | 1331 | struct btrfs_free_space *info) |
0f9dd46c | 1332 | { |
34d52cb6 LZ |
1333 | rb_erase(&info->offset_index, &ctl->free_space_offset); |
1334 | ctl->free_extents--; | |
f333adb5 LZ |
1335 | } |
1336 | ||
34d52cb6 | 1337 | static void unlink_free_space(struct btrfs_free_space_ctl *ctl, |
f333adb5 LZ |
1338 | struct btrfs_free_space *info) |
1339 | { | |
34d52cb6 LZ |
1340 | __unlink_free_space(ctl, info); |
1341 | ctl->free_space -= info->bytes; | |
0f9dd46c JB |
1342 | } |
1343 | ||
34d52cb6 | 1344 | static int link_free_space(struct btrfs_free_space_ctl *ctl, |
0f9dd46c JB |
1345 | struct btrfs_free_space *info) |
1346 | { | |
1347 | int ret = 0; | |
1348 | ||
96303081 | 1349 | BUG_ON(!info->bitmap && !info->bytes); |
34d52cb6 | 1350 | ret = tree_insert_offset(&ctl->free_space_offset, info->offset, |
96303081 | 1351 | &info->offset_index, (info->bitmap != NULL)); |
0f9dd46c JB |
1352 | if (ret) |
1353 | return ret; | |
1354 | ||
34d52cb6 LZ |
1355 | ctl->free_space += info->bytes; |
1356 | ctl->free_extents++; | |
96303081 JB |
1357 | return ret; |
1358 | } | |
1359 | ||
34d52cb6 | 1360 | static void recalculate_thresholds(struct btrfs_free_space_ctl *ctl) |
96303081 | 1361 | { |
34d52cb6 | 1362 | struct btrfs_block_group_cache *block_group = ctl->private; |
25891f79 JB |
1363 | u64 max_bytes; |
1364 | u64 bitmap_bytes; | |
1365 | u64 extent_bytes; | |
8eb2d829 | 1366 | u64 size = block_group->key.offset; |
34d52cb6 LZ |
1367 | u64 bytes_per_bg = BITS_PER_BITMAP * block_group->sectorsize; |
1368 | int max_bitmaps = div64_u64(size + bytes_per_bg - 1, bytes_per_bg); | |
1369 | ||
1370 | BUG_ON(ctl->total_bitmaps > max_bitmaps); | |
96303081 JB |
1371 | |
1372 | /* | |
1373 | * The goal is to keep the total amount of memory used per 1gb of space | |
1374 | * at or below 32k, so we need to adjust how much memory we allow to be | |
1375 | * used by extent based free space tracking | |
1376 | */ | |
8eb2d829 LZ |
1377 | if (size < 1024 * 1024 * 1024) |
1378 | max_bytes = MAX_CACHE_BYTES_PER_GIG; | |
1379 | else | |
1380 | max_bytes = MAX_CACHE_BYTES_PER_GIG * | |
1381 | div64_u64(size, 1024 * 1024 * 1024); | |
96303081 | 1382 | |
25891f79 JB |
1383 | /* |
1384 | * we want to account for 1 more bitmap than what we have so we can make | |
1385 | * sure we don't go over our overall goal of MAX_CACHE_BYTES_PER_GIG as | |
1386 | * we add more bitmaps. | |
1387 | */ | |
34d52cb6 | 1388 | bitmap_bytes = (ctl->total_bitmaps + 1) * PAGE_CACHE_SIZE; |
96303081 | 1389 | |
25891f79 | 1390 | if (bitmap_bytes >= max_bytes) { |
34d52cb6 | 1391 | ctl->extents_thresh = 0; |
25891f79 JB |
1392 | return; |
1393 | } | |
96303081 | 1394 | |
25891f79 JB |
1395 | /* |
1396 | * we want the extent entry threshold to always be at most 1/2 the maxw | |
1397 | * bytes we can have, or whatever is less than that. | |
1398 | */ | |
1399 | extent_bytes = max_bytes - bitmap_bytes; | |
1400 | extent_bytes = min_t(u64, extent_bytes, div64_u64(max_bytes, 2)); | |
96303081 | 1401 | |
34d52cb6 | 1402 | ctl->extents_thresh = |
25891f79 | 1403 | div64_u64(extent_bytes, (sizeof(struct btrfs_free_space))); |
96303081 JB |
1404 | } |
1405 | ||
bb3ac5a4 MX |
1406 | static inline void __bitmap_clear_bits(struct btrfs_free_space_ctl *ctl, |
1407 | struct btrfs_free_space *info, | |
1408 | u64 offset, u64 bytes) | |
96303081 | 1409 | { |
f38b6e75 | 1410 | unsigned long start, count; |
96303081 | 1411 | |
34d52cb6 LZ |
1412 | start = offset_to_bit(info->offset, ctl->unit, offset); |
1413 | count = bytes_to_bits(bytes, ctl->unit); | |
f38b6e75 | 1414 | BUG_ON(start + count > BITS_PER_BITMAP); |
96303081 | 1415 | |
f38b6e75 | 1416 | bitmap_clear(info->bitmap, start, count); |
96303081 JB |
1417 | |
1418 | info->bytes -= bytes; | |
bb3ac5a4 MX |
1419 | } |
1420 | ||
1421 | static void bitmap_clear_bits(struct btrfs_free_space_ctl *ctl, | |
1422 | struct btrfs_free_space *info, u64 offset, | |
1423 | u64 bytes) | |
1424 | { | |
1425 | __bitmap_clear_bits(ctl, info, offset, bytes); | |
34d52cb6 | 1426 | ctl->free_space -= bytes; |
96303081 JB |
1427 | } |
1428 | ||
34d52cb6 | 1429 | static void bitmap_set_bits(struct btrfs_free_space_ctl *ctl, |
817d52f8 JB |
1430 | struct btrfs_free_space *info, u64 offset, |
1431 | u64 bytes) | |
96303081 | 1432 | { |
f38b6e75 | 1433 | unsigned long start, count; |
96303081 | 1434 | |
34d52cb6 LZ |
1435 | start = offset_to_bit(info->offset, ctl->unit, offset); |
1436 | count = bytes_to_bits(bytes, ctl->unit); | |
f38b6e75 | 1437 | BUG_ON(start + count > BITS_PER_BITMAP); |
96303081 | 1438 | |
f38b6e75 | 1439 | bitmap_set(info->bitmap, start, count); |
96303081 JB |
1440 | |
1441 | info->bytes += bytes; | |
34d52cb6 | 1442 | ctl->free_space += bytes; |
96303081 JB |
1443 | } |
1444 | ||
34d52cb6 | 1445 | static int search_bitmap(struct btrfs_free_space_ctl *ctl, |
96303081 JB |
1446 | struct btrfs_free_space *bitmap_info, u64 *offset, |
1447 | u64 *bytes) | |
1448 | { | |
1449 | unsigned long found_bits = 0; | |
1450 | unsigned long bits, i; | |
1451 | unsigned long next_zero; | |
1452 | ||
34d52cb6 | 1453 | i = offset_to_bit(bitmap_info->offset, ctl->unit, |
96303081 | 1454 | max_t(u64, *offset, bitmap_info->offset)); |
34d52cb6 | 1455 | bits = bytes_to_bits(*bytes, ctl->unit); |
96303081 JB |
1456 | |
1457 | for (i = find_next_bit(bitmap_info->bitmap, BITS_PER_BITMAP, i); | |
1458 | i < BITS_PER_BITMAP; | |
1459 | i = find_next_bit(bitmap_info->bitmap, BITS_PER_BITMAP, i + 1)) { | |
1460 | next_zero = find_next_zero_bit(bitmap_info->bitmap, | |
1461 | BITS_PER_BITMAP, i); | |
1462 | if ((next_zero - i) >= bits) { | |
1463 | found_bits = next_zero - i; | |
1464 | break; | |
1465 | } | |
1466 | i = next_zero; | |
1467 | } | |
1468 | ||
1469 | if (found_bits) { | |
34d52cb6 LZ |
1470 | *offset = (u64)(i * ctl->unit) + bitmap_info->offset; |
1471 | *bytes = (u64)(found_bits) * ctl->unit; | |
96303081 JB |
1472 | return 0; |
1473 | } | |
1474 | ||
1475 | return -1; | |
1476 | } | |
1477 | ||
34d52cb6 LZ |
1478 | static struct btrfs_free_space * |
1479 | find_free_space(struct btrfs_free_space_ctl *ctl, u64 *offset, u64 *bytes) | |
96303081 JB |
1480 | { |
1481 | struct btrfs_free_space *entry; | |
1482 | struct rb_node *node; | |
1483 | int ret; | |
1484 | ||
34d52cb6 | 1485 | if (!ctl->free_space_offset.rb_node) |
96303081 JB |
1486 | return NULL; |
1487 | ||
34d52cb6 | 1488 | entry = tree_search_offset(ctl, offset_to_bitmap(ctl, *offset), 0, 1); |
96303081 JB |
1489 | if (!entry) |
1490 | return NULL; | |
1491 | ||
1492 | for (node = &entry->offset_index; node; node = rb_next(node)) { | |
1493 | entry = rb_entry(node, struct btrfs_free_space, offset_index); | |
1494 | if (entry->bytes < *bytes) | |
1495 | continue; | |
1496 | ||
1497 | if (entry->bitmap) { | |
34d52cb6 | 1498 | ret = search_bitmap(ctl, entry, offset, bytes); |
96303081 JB |
1499 | if (!ret) |
1500 | return entry; | |
1501 | continue; | |
1502 | } | |
1503 | ||
1504 | *offset = entry->offset; | |
1505 | *bytes = entry->bytes; | |
1506 | return entry; | |
1507 | } | |
1508 | ||
1509 | return NULL; | |
1510 | } | |
1511 | ||
34d52cb6 | 1512 | static void add_new_bitmap(struct btrfs_free_space_ctl *ctl, |
96303081 JB |
1513 | struct btrfs_free_space *info, u64 offset) |
1514 | { | |
34d52cb6 | 1515 | info->offset = offset_to_bitmap(ctl, offset); |
f019f426 | 1516 | info->bytes = 0; |
f2d0f676 | 1517 | INIT_LIST_HEAD(&info->list); |
34d52cb6 LZ |
1518 | link_free_space(ctl, info); |
1519 | ctl->total_bitmaps++; | |
96303081 | 1520 | |
34d52cb6 | 1521 | ctl->op->recalc_thresholds(ctl); |
96303081 JB |
1522 | } |
1523 | ||
34d52cb6 | 1524 | static void free_bitmap(struct btrfs_free_space_ctl *ctl, |
edf6e2d1 LZ |
1525 | struct btrfs_free_space *bitmap_info) |
1526 | { | |
34d52cb6 | 1527 | unlink_free_space(ctl, bitmap_info); |
edf6e2d1 | 1528 | kfree(bitmap_info->bitmap); |
dc89e982 | 1529 | kmem_cache_free(btrfs_free_space_cachep, bitmap_info); |
34d52cb6 LZ |
1530 | ctl->total_bitmaps--; |
1531 | ctl->op->recalc_thresholds(ctl); | |
edf6e2d1 LZ |
1532 | } |
1533 | ||
34d52cb6 | 1534 | static noinline int remove_from_bitmap(struct btrfs_free_space_ctl *ctl, |
96303081 JB |
1535 | struct btrfs_free_space *bitmap_info, |
1536 | u64 *offset, u64 *bytes) | |
1537 | { | |
1538 | u64 end; | |
6606bb97 JB |
1539 | u64 search_start, search_bytes; |
1540 | int ret; | |
96303081 JB |
1541 | |
1542 | again: | |
34d52cb6 | 1543 | end = bitmap_info->offset + (u64)(BITS_PER_BITMAP * ctl->unit) - 1; |
96303081 | 1544 | |
6606bb97 | 1545 | /* |
bdb7d303 JB |
1546 | * We need to search for bits in this bitmap. We could only cover some |
1547 | * of the extent in this bitmap thanks to how we add space, so we need | |
1548 | * to search for as much as it as we can and clear that amount, and then | |
1549 | * go searching for the next bit. | |
6606bb97 JB |
1550 | */ |
1551 | search_start = *offset; | |
bdb7d303 | 1552 | search_bytes = ctl->unit; |
13dbc089 | 1553 | search_bytes = min(search_bytes, end - search_start + 1); |
34d52cb6 | 1554 | ret = search_bitmap(ctl, bitmap_info, &search_start, &search_bytes); |
6606bb97 JB |
1555 | BUG_ON(ret < 0 || search_start != *offset); |
1556 | ||
bdb7d303 JB |
1557 | /* We may have found more bits than what we need */ |
1558 | search_bytes = min(search_bytes, *bytes); | |
1559 | ||
1560 | /* Cannot clear past the end of the bitmap */ | |
1561 | search_bytes = min(search_bytes, end - search_start + 1); | |
1562 | ||
1563 | bitmap_clear_bits(ctl, bitmap_info, search_start, search_bytes); | |
1564 | *offset += search_bytes; | |
1565 | *bytes -= search_bytes; | |
96303081 JB |
1566 | |
1567 | if (*bytes) { | |
6606bb97 | 1568 | struct rb_node *next = rb_next(&bitmap_info->offset_index); |
edf6e2d1 | 1569 | if (!bitmap_info->bytes) |
34d52cb6 | 1570 | free_bitmap(ctl, bitmap_info); |
96303081 | 1571 | |
6606bb97 JB |
1572 | /* |
1573 | * no entry after this bitmap, but we still have bytes to | |
1574 | * remove, so something has gone wrong. | |
1575 | */ | |
1576 | if (!next) | |
96303081 JB |
1577 | return -EINVAL; |
1578 | ||
6606bb97 JB |
1579 | bitmap_info = rb_entry(next, struct btrfs_free_space, |
1580 | offset_index); | |
1581 | ||
1582 | /* | |
1583 | * if the next entry isn't a bitmap we need to return to let the | |
1584 | * extent stuff do its work. | |
1585 | */ | |
96303081 JB |
1586 | if (!bitmap_info->bitmap) |
1587 | return -EAGAIN; | |
1588 | ||
6606bb97 JB |
1589 | /* |
1590 | * Ok the next item is a bitmap, but it may not actually hold | |
1591 | * the information for the rest of this free space stuff, so | |
1592 | * look for it, and if we don't find it return so we can try | |
1593 | * everything over again. | |
1594 | */ | |
1595 | search_start = *offset; | |
bdb7d303 | 1596 | search_bytes = ctl->unit; |
34d52cb6 | 1597 | ret = search_bitmap(ctl, bitmap_info, &search_start, |
6606bb97 JB |
1598 | &search_bytes); |
1599 | if (ret < 0 || search_start != *offset) | |
1600 | return -EAGAIN; | |
1601 | ||
96303081 | 1602 | goto again; |
edf6e2d1 | 1603 | } else if (!bitmap_info->bytes) |
34d52cb6 | 1604 | free_bitmap(ctl, bitmap_info); |
96303081 JB |
1605 | |
1606 | return 0; | |
1607 | } | |
1608 | ||
2cdc342c JB |
1609 | static u64 add_bytes_to_bitmap(struct btrfs_free_space_ctl *ctl, |
1610 | struct btrfs_free_space *info, u64 offset, | |
1611 | u64 bytes) | |
1612 | { | |
1613 | u64 bytes_to_set = 0; | |
1614 | u64 end; | |
1615 | ||
1616 | end = info->offset + (u64)(BITS_PER_BITMAP * ctl->unit); | |
1617 | ||
1618 | bytes_to_set = min(end - offset, bytes); | |
1619 | ||
1620 | bitmap_set_bits(ctl, info, offset, bytes_to_set); | |
1621 | ||
1622 | return bytes_to_set; | |
1623 | ||
1624 | } | |
1625 | ||
34d52cb6 LZ |
1626 | static bool use_bitmap(struct btrfs_free_space_ctl *ctl, |
1627 | struct btrfs_free_space *info) | |
96303081 | 1628 | { |
34d52cb6 | 1629 | struct btrfs_block_group_cache *block_group = ctl->private; |
96303081 JB |
1630 | |
1631 | /* | |
1632 | * If we are below the extents threshold then we can add this as an | |
1633 | * extent, and don't have to deal with the bitmap | |
1634 | */ | |
34d52cb6 | 1635 | if (ctl->free_extents < ctl->extents_thresh) { |
32cb0840 JB |
1636 | /* |
1637 | * If this block group has some small extents we don't want to | |
1638 | * use up all of our free slots in the cache with them, we want | |
1639 | * to reserve them to larger extents, however if we have plent | |
1640 | * of cache left then go ahead an dadd them, no sense in adding | |
1641 | * the overhead of a bitmap if we don't have to. | |
1642 | */ | |
1643 | if (info->bytes <= block_group->sectorsize * 4) { | |
34d52cb6 LZ |
1644 | if (ctl->free_extents * 2 <= ctl->extents_thresh) |
1645 | return false; | |
32cb0840 | 1646 | } else { |
34d52cb6 | 1647 | return false; |
32cb0840 JB |
1648 | } |
1649 | } | |
96303081 JB |
1650 | |
1651 | /* | |
1652 | * some block groups are so tiny they can't be enveloped by a bitmap, so | |
1653 | * don't even bother to create a bitmap for this | |
1654 | */ | |
1655 | if (BITS_PER_BITMAP * block_group->sectorsize > | |
1656 | block_group->key.offset) | |
34d52cb6 LZ |
1657 | return false; |
1658 | ||
1659 | return true; | |
1660 | } | |
1661 | ||
2cdc342c JB |
1662 | static struct btrfs_free_space_op free_space_op = { |
1663 | .recalc_thresholds = recalculate_thresholds, | |
1664 | .use_bitmap = use_bitmap, | |
1665 | }; | |
1666 | ||
34d52cb6 LZ |
1667 | static int insert_into_bitmap(struct btrfs_free_space_ctl *ctl, |
1668 | struct btrfs_free_space *info) | |
1669 | { | |
1670 | struct btrfs_free_space *bitmap_info; | |
2cdc342c | 1671 | struct btrfs_block_group_cache *block_group = NULL; |
34d52cb6 | 1672 | int added = 0; |
2cdc342c | 1673 | u64 bytes, offset, bytes_added; |
34d52cb6 | 1674 | int ret; |
96303081 JB |
1675 | |
1676 | bytes = info->bytes; | |
1677 | offset = info->offset; | |
1678 | ||
34d52cb6 LZ |
1679 | if (!ctl->op->use_bitmap(ctl, info)) |
1680 | return 0; | |
1681 | ||
2cdc342c JB |
1682 | if (ctl->op == &free_space_op) |
1683 | block_group = ctl->private; | |
38e87880 | 1684 | again: |
2cdc342c JB |
1685 | /* |
1686 | * Since we link bitmaps right into the cluster we need to see if we | |
1687 | * have a cluster here, and if so and it has our bitmap we need to add | |
1688 | * the free space to that bitmap. | |
1689 | */ | |
1690 | if (block_group && !list_empty(&block_group->cluster_list)) { | |
1691 | struct btrfs_free_cluster *cluster; | |
1692 | struct rb_node *node; | |
1693 | struct btrfs_free_space *entry; | |
1694 | ||
1695 | cluster = list_entry(block_group->cluster_list.next, | |
1696 | struct btrfs_free_cluster, | |
1697 | block_group_list); | |
1698 | spin_lock(&cluster->lock); | |
1699 | node = rb_first(&cluster->root); | |
1700 | if (!node) { | |
1701 | spin_unlock(&cluster->lock); | |
38e87880 | 1702 | goto no_cluster_bitmap; |
2cdc342c JB |
1703 | } |
1704 | ||
1705 | entry = rb_entry(node, struct btrfs_free_space, offset_index); | |
1706 | if (!entry->bitmap) { | |
1707 | spin_unlock(&cluster->lock); | |
38e87880 | 1708 | goto no_cluster_bitmap; |
2cdc342c JB |
1709 | } |
1710 | ||
1711 | if (entry->offset == offset_to_bitmap(ctl, offset)) { | |
1712 | bytes_added = add_bytes_to_bitmap(ctl, entry, | |
1713 | offset, bytes); | |
1714 | bytes -= bytes_added; | |
1715 | offset += bytes_added; | |
1716 | } | |
1717 | spin_unlock(&cluster->lock); | |
1718 | if (!bytes) { | |
1719 | ret = 1; | |
1720 | goto out; | |
1721 | } | |
1722 | } | |
38e87880 CM |
1723 | |
1724 | no_cluster_bitmap: | |
34d52cb6 | 1725 | bitmap_info = tree_search_offset(ctl, offset_to_bitmap(ctl, offset), |
96303081 JB |
1726 | 1, 0); |
1727 | if (!bitmap_info) { | |
1728 | BUG_ON(added); | |
1729 | goto new_bitmap; | |
1730 | } | |
1731 | ||
2cdc342c JB |
1732 | bytes_added = add_bytes_to_bitmap(ctl, bitmap_info, offset, bytes); |
1733 | bytes -= bytes_added; | |
1734 | offset += bytes_added; | |
1735 | added = 0; | |
96303081 JB |
1736 | |
1737 | if (!bytes) { | |
1738 | ret = 1; | |
1739 | goto out; | |
1740 | } else | |
1741 | goto again; | |
1742 | ||
1743 | new_bitmap: | |
1744 | if (info && info->bitmap) { | |
34d52cb6 | 1745 | add_new_bitmap(ctl, info, offset); |
96303081 JB |
1746 | added = 1; |
1747 | info = NULL; | |
1748 | goto again; | |
1749 | } else { | |
34d52cb6 | 1750 | spin_unlock(&ctl->tree_lock); |
96303081 JB |
1751 | |
1752 | /* no pre-allocated info, allocate a new one */ | |
1753 | if (!info) { | |
dc89e982 JB |
1754 | info = kmem_cache_zalloc(btrfs_free_space_cachep, |
1755 | GFP_NOFS); | |
96303081 | 1756 | if (!info) { |
34d52cb6 | 1757 | spin_lock(&ctl->tree_lock); |
96303081 JB |
1758 | ret = -ENOMEM; |
1759 | goto out; | |
1760 | } | |
1761 | } | |
1762 | ||
1763 | /* allocate the bitmap */ | |
1764 | info->bitmap = kzalloc(PAGE_CACHE_SIZE, GFP_NOFS); | |
34d52cb6 | 1765 | spin_lock(&ctl->tree_lock); |
96303081 JB |
1766 | if (!info->bitmap) { |
1767 | ret = -ENOMEM; | |
1768 | goto out; | |
1769 | } | |
1770 | goto again; | |
1771 | } | |
1772 | ||
1773 | out: | |
1774 | if (info) { | |
1775 | if (info->bitmap) | |
1776 | kfree(info->bitmap); | |
dc89e982 | 1777 | kmem_cache_free(btrfs_free_space_cachep, info); |
96303081 | 1778 | } |
0f9dd46c JB |
1779 | |
1780 | return ret; | |
1781 | } | |
1782 | ||
945d8962 | 1783 | static bool try_merge_free_space(struct btrfs_free_space_ctl *ctl, |
f333adb5 | 1784 | struct btrfs_free_space *info, bool update_stat) |
0f9dd46c | 1785 | { |
120d66ee LZ |
1786 | struct btrfs_free_space *left_info; |
1787 | struct btrfs_free_space *right_info; | |
1788 | bool merged = false; | |
1789 | u64 offset = info->offset; | |
1790 | u64 bytes = info->bytes; | |
6226cb0a | 1791 | |
0f9dd46c JB |
1792 | /* |
1793 | * first we want to see if there is free space adjacent to the range we | |
1794 | * are adding, if there is remove that struct and add a new one to | |
1795 | * cover the entire range | |
1796 | */ | |
34d52cb6 | 1797 | right_info = tree_search_offset(ctl, offset + bytes, 0, 0); |
96303081 JB |
1798 | if (right_info && rb_prev(&right_info->offset_index)) |
1799 | left_info = rb_entry(rb_prev(&right_info->offset_index), | |
1800 | struct btrfs_free_space, offset_index); | |
1801 | else | |
34d52cb6 | 1802 | left_info = tree_search_offset(ctl, offset - 1, 0, 0); |
0f9dd46c | 1803 | |
96303081 | 1804 | if (right_info && !right_info->bitmap) { |
f333adb5 | 1805 | if (update_stat) |
34d52cb6 | 1806 | unlink_free_space(ctl, right_info); |
f333adb5 | 1807 | else |
34d52cb6 | 1808 | __unlink_free_space(ctl, right_info); |
6226cb0a | 1809 | info->bytes += right_info->bytes; |
dc89e982 | 1810 | kmem_cache_free(btrfs_free_space_cachep, right_info); |
120d66ee | 1811 | merged = true; |
0f9dd46c JB |
1812 | } |
1813 | ||
96303081 JB |
1814 | if (left_info && !left_info->bitmap && |
1815 | left_info->offset + left_info->bytes == offset) { | |
f333adb5 | 1816 | if (update_stat) |
34d52cb6 | 1817 | unlink_free_space(ctl, left_info); |
f333adb5 | 1818 | else |
34d52cb6 | 1819 | __unlink_free_space(ctl, left_info); |
6226cb0a JB |
1820 | info->offset = left_info->offset; |
1821 | info->bytes += left_info->bytes; | |
dc89e982 | 1822 | kmem_cache_free(btrfs_free_space_cachep, left_info); |
120d66ee | 1823 | merged = true; |
0f9dd46c JB |
1824 | } |
1825 | ||
120d66ee LZ |
1826 | return merged; |
1827 | } | |
1828 | ||
581bb050 LZ |
1829 | int __btrfs_add_free_space(struct btrfs_free_space_ctl *ctl, |
1830 | u64 offset, u64 bytes) | |
120d66ee LZ |
1831 | { |
1832 | struct btrfs_free_space *info; | |
1833 | int ret = 0; | |
1834 | ||
dc89e982 | 1835 | info = kmem_cache_zalloc(btrfs_free_space_cachep, GFP_NOFS); |
120d66ee LZ |
1836 | if (!info) |
1837 | return -ENOMEM; | |
1838 | ||
1839 | info->offset = offset; | |
1840 | info->bytes = bytes; | |
1841 | ||
34d52cb6 | 1842 | spin_lock(&ctl->tree_lock); |
120d66ee | 1843 | |
34d52cb6 | 1844 | if (try_merge_free_space(ctl, info, true)) |
120d66ee LZ |
1845 | goto link; |
1846 | ||
1847 | /* | |
1848 | * There was no extent directly to the left or right of this new | |
1849 | * extent then we know we're going to have to allocate a new extent, so | |
1850 | * before we do that see if we need to drop this into a bitmap | |
1851 | */ | |
34d52cb6 | 1852 | ret = insert_into_bitmap(ctl, info); |
120d66ee LZ |
1853 | if (ret < 0) { |
1854 | goto out; | |
1855 | } else if (ret) { | |
1856 | ret = 0; | |
1857 | goto out; | |
1858 | } | |
1859 | link: | |
34d52cb6 | 1860 | ret = link_free_space(ctl, info); |
0f9dd46c | 1861 | if (ret) |
dc89e982 | 1862 | kmem_cache_free(btrfs_free_space_cachep, info); |
96303081 | 1863 | out: |
34d52cb6 | 1864 | spin_unlock(&ctl->tree_lock); |
6226cb0a | 1865 | |
0f9dd46c | 1866 | if (ret) { |
96303081 | 1867 | printk(KERN_CRIT "btrfs: unable to add free space :%d\n", ret); |
c293498b | 1868 | BUG_ON(ret == -EEXIST); |
0f9dd46c JB |
1869 | } |
1870 | ||
0f9dd46c JB |
1871 | return ret; |
1872 | } | |
1873 | ||
6226cb0a JB |
1874 | int btrfs_remove_free_space(struct btrfs_block_group_cache *block_group, |
1875 | u64 offset, u64 bytes) | |
0f9dd46c | 1876 | { |
34d52cb6 | 1877 | struct btrfs_free_space_ctl *ctl = block_group->free_space_ctl; |
0f9dd46c JB |
1878 | struct btrfs_free_space *info; |
1879 | int ret = 0; | |
1880 | ||
34d52cb6 | 1881 | spin_lock(&ctl->tree_lock); |
6226cb0a | 1882 | |
96303081 | 1883 | again: |
bdb7d303 JB |
1884 | if (!bytes) |
1885 | goto out_lock; | |
1886 | ||
34d52cb6 | 1887 | info = tree_search_offset(ctl, offset, 0, 0); |
96303081 | 1888 | if (!info) { |
6606bb97 JB |
1889 | /* |
1890 | * oops didn't find an extent that matched the space we wanted | |
1891 | * to remove, look for a bitmap instead | |
1892 | */ | |
34d52cb6 | 1893 | info = tree_search_offset(ctl, offset_to_bitmap(ctl, offset), |
6606bb97 JB |
1894 | 1, 0); |
1895 | if (!info) { | |
24a70313 CM |
1896 | /* the tree logging code might be calling us before we |
1897 | * have fully loaded the free space rbtree for this | |
1898 | * block group. So it is possible the entry won't | |
1899 | * be in the rbtree yet at all. The caching code | |
1900 | * will make sure not to put it in the rbtree if | |
1901 | * the logging code has pinned it. | |
1902 | */ | |
6606bb97 JB |
1903 | goto out_lock; |
1904 | } | |
96303081 JB |
1905 | } |
1906 | ||
bdb7d303 | 1907 | if (!info->bitmap) { |
34d52cb6 | 1908 | unlink_free_space(ctl, info); |
bdb7d303 JB |
1909 | if (offset == info->offset) { |
1910 | u64 to_free = min(bytes, info->bytes); | |
1911 | ||
1912 | info->bytes -= to_free; | |
1913 | info->offset += to_free; | |
1914 | if (info->bytes) { | |
1915 | ret = link_free_space(ctl, info); | |
1916 | WARN_ON(ret); | |
1917 | } else { | |
1918 | kmem_cache_free(btrfs_free_space_cachep, info); | |
1919 | } | |
0f9dd46c | 1920 | |
bdb7d303 JB |
1921 | offset += to_free; |
1922 | bytes -= to_free; | |
1923 | goto again; | |
1924 | } else { | |
1925 | u64 old_end = info->bytes + info->offset; | |
9b49c9b9 | 1926 | |
bdb7d303 | 1927 | info->bytes = offset - info->offset; |
34d52cb6 | 1928 | ret = link_free_space(ctl, info); |
96303081 JB |
1929 | WARN_ON(ret); |
1930 | if (ret) | |
1931 | goto out_lock; | |
96303081 | 1932 | |
bdb7d303 JB |
1933 | /* Not enough bytes in this entry to satisfy us */ |
1934 | if (old_end < offset + bytes) { | |
1935 | bytes -= old_end - offset; | |
1936 | offset = old_end; | |
1937 | goto again; | |
1938 | } else if (old_end == offset + bytes) { | |
1939 | /* all done */ | |
1940 | goto out_lock; | |
1941 | } | |
1942 | spin_unlock(&ctl->tree_lock); | |
1943 | ||
1944 | ret = btrfs_add_free_space(block_group, offset + bytes, | |
1945 | old_end - (offset + bytes)); | |
1946 | WARN_ON(ret); | |
1947 | goto out; | |
1948 | } | |
0f9dd46c | 1949 | } |
96303081 | 1950 | |
34d52cb6 | 1951 | ret = remove_from_bitmap(ctl, info, &offset, &bytes); |
96303081 JB |
1952 | if (ret == -EAGAIN) |
1953 | goto again; | |
79787eaa | 1954 | BUG_ON(ret); /* logic error */ |
96303081 | 1955 | out_lock: |
34d52cb6 | 1956 | spin_unlock(&ctl->tree_lock); |
0f9dd46c | 1957 | out: |
25179201 JB |
1958 | return ret; |
1959 | } | |
1960 | ||
0f9dd46c JB |
1961 | void btrfs_dump_free_space(struct btrfs_block_group_cache *block_group, |
1962 | u64 bytes) | |
1963 | { | |
34d52cb6 | 1964 | struct btrfs_free_space_ctl *ctl = block_group->free_space_ctl; |
0f9dd46c JB |
1965 | struct btrfs_free_space *info; |
1966 | struct rb_node *n; | |
1967 | int count = 0; | |
1968 | ||
34d52cb6 | 1969 | for (n = rb_first(&ctl->free_space_offset); n; n = rb_next(n)) { |
0f9dd46c | 1970 | info = rb_entry(n, struct btrfs_free_space, offset_index); |
f6175efa | 1971 | if (info->bytes >= bytes && !block_group->ro) |
0f9dd46c | 1972 | count++; |
96303081 | 1973 | printk(KERN_CRIT "entry offset %llu, bytes %llu, bitmap %s\n", |
21380931 | 1974 | (unsigned long long)info->offset, |
96303081 JB |
1975 | (unsigned long long)info->bytes, |
1976 | (info->bitmap) ? "yes" : "no"); | |
0f9dd46c | 1977 | } |
96303081 JB |
1978 | printk(KERN_INFO "block group has cluster?: %s\n", |
1979 | list_empty(&block_group->cluster_list) ? "no" : "yes"); | |
0f9dd46c JB |
1980 | printk(KERN_INFO "%d blocks of free space at or bigger than bytes is" |
1981 | "\n", count); | |
1982 | } | |
1983 | ||
34d52cb6 | 1984 | void btrfs_init_free_space_ctl(struct btrfs_block_group_cache *block_group) |
0f9dd46c | 1985 | { |
34d52cb6 | 1986 | struct btrfs_free_space_ctl *ctl = block_group->free_space_ctl; |
0f9dd46c | 1987 | |
34d52cb6 LZ |
1988 | spin_lock_init(&ctl->tree_lock); |
1989 | ctl->unit = block_group->sectorsize; | |
1990 | ctl->start = block_group->key.objectid; | |
1991 | ctl->private = block_group; | |
1992 | ctl->op = &free_space_op; | |
0f9dd46c | 1993 | |
34d52cb6 LZ |
1994 | /* |
1995 | * we only want to have 32k of ram per block group for keeping | |
1996 | * track of free space, and if we pass 1/2 of that we want to | |
1997 | * start converting things over to using bitmaps | |
1998 | */ | |
1999 | ctl->extents_thresh = ((1024 * 32) / 2) / | |
2000 | sizeof(struct btrfs_free_space); | |
0f9dd46c JB |
2001 | } |
2002 | ||
fa9c0d79 CM |
2003 | /* |
2004 | * for a given cluster, put all of its extents back into the free | |
2005 | * space cache. If the block group passed doesn't match the block group | |
2006 | * pointed to by the cluster, someone else raced in and freed the | |
2007 | * cluster already. In that case, we just return without changing anything | |
2008 | */ | |
2009 | static int | |
2010 | __btrfs_return_cluster_to_free_space( | |
2011 | struct btrfs_block_group_cache *block_group, | |
2012 | struct btrfs_free_cluster *cluster) | |
2013 | { | |
34d52cb6 | 2014 | struct btrfs_free_space_ctl *ctl = block_group->free_space_ctl; |
fa9c0d79 CM |
2015 | struct btrfs_free_space *entry; |
2016 | struct rb_node *node; | |
2017 | ||
2018 | spin_lock(&cluster->lock); | |
2019 | if (cluster->block_group != block_group) | |
2020 | goto out; | |
2021 | ||
96303081 | 2022 | cluster->block_group = NULL; |
fa9c0d79 | 2023 | cluster->window_start = 0; |
96303081 | 2024 | list_del_init(&cluster->block_group_list); |
96303081 | 2025 | |
fa9c0d79 | 2026 | node = rb_first(&cluster->root); |
96303081 | 2027 | while (node) { |
4e69b598 JB |
2028 | bool bitmap; |
2029 | ||
fa9c0d79 CM |
2030 | entry = rb_entry(node, struct btrfs_free_space, offset_index); |
2031 | node = rb_next(&entry->offset_index); | |
2032 | rb_erase(&entry->offset_index, &cluster->root); | |
4e69b598 JB |
2033 | |
2034 | bitmap = (entry->bitmap != NULL); | |
2035 | if (!bitmap) | |
34d52cb6 LZ |
2036 | try_merge_free_space(ctl, entry, false); |
2037 | tree_insert_offset(&ctl->free_space_offset, | |
4e69b598 | 2038 | entry->offset, &entry->offset_index, bitmap); |
fa9c0d79 | 2039 | } |
6bef4d31 | 2040 | cluster->root = RB_ROOT; |
96303081 | 2041 | |
fa9c0d79 CM |
2042 | out: |
2043 | spin_unlock(&cluster->lock); | |
96303081 | 2044 | btrfs_put_block_group(block_group); |
fa9c0d79 CM |
2045 | return 0; |
2046 | } | |
2047 | ||
09655373 | 2048 | void __btrfs_remove_free_space_cache_locked(struct btrfs_free_space_ctl *ctl) |
0f9dd46c JB |
2049 | { |
2050 | struct btrfs_free_space *info; | |
2051 | struct rb_node *node; | |
581bb050 | 2052 | |
581bb050 LZ |
2053 | while ((node = rb_last(&ctl->free_space_offset)) != NULL) { |
2054 | info = rb_entry(node, struct btrfs_free_space, offset_index); | |
9b90f513 JB |
2055 | if (!info->bitmap) { |
2056 | unlink_free_space(ctl, info); | |
2057 | kmem_cache_free(btrfs_free_space_cachep, info); | |
2058 | } else { | |
2059 | free_bitmap(ctl, info); | |
2060 | } | |
581bb050 LZ |
2061 | if (need_resched()) { |
2062 | spin_unlock(&ctl->tree_lock); | |
2063 | cond_resched(); | |
2064 | spin_lock(&ctl->tree_lock); | |
2065 | } | |
2066 | } | |
09655373 CM |
2067 | } |
2068 | ||
2069 | void __btrfs_remove_free_space_cache(struct btrfs_free_space_ctl *ctl) | |
2070 | { | |
2071 | spin_lock(&ctl->tree_lock); | |
2072 | __btrfs_remove_free_space_cache_locked(ctl); | |
581bb050 LZ |
2073 | spin_unlock(&ctl->tree_lock); |
2074 | } | |
2075 | ||
2076 | void btrfs_remove_free_space_cache(struct btrfs_block_group_cache *block_group) | |
2077 | { | |
2078 | struct btrfs_free_space_ctl *ctl = block_group->free_space_ctl; | |
fa9c0d79 | 2079 | struct btrfs_free_cluster *cluster; |
96303081 | 2080 | struct list_head *head; |
0f9dd46c | 2081 | |
34d52cb6 | 2082 | spin_lock(&ctl->tree_lock); |
96303081 JB |
2083 | while ((head = block_group->cluster_list.next) != |
2084 | &block_group->cluster_list) { | |
2085 | cluster = list_entry(head, struct btrfs_free_cluster, | |
2086 | block_group_list); | |
fa9c0d79 CM |
2087 | |
2088 | WARN_ON(cluster->block_group != block_group); | |
2089 | __btrfs_return_cluster_to_free_space(block_group, cluster); | |
96303081 | 2090 | if (need_resched()) { |
34d52cb6 | 2091 | spin_unlock(&ctl->tree_lock); |
96303081 | 2092 | cond_resched(); |
34d52cb6 | 2093 | spin_lock(&ctl->tree_lock); |
96303081 | 2094 | } |
fa9c0d79 | 2095 | } |
09655373 | 2096 | __btrfs_remove_free_space_cache_locked(ctl); |
34d52cb6 | 2097 | spin_unlock(&ctl->tree_lock); |
fa9c0d79 | 2098 | |
0f9dd46c JB |
2099 | } |
2100 | ||
6226cb0a JB |
2101 | u64 btrfs_find_space_for_alloc(struct btrfs_block_group_cache *block_group, |
2102 | u64 offset, u64 bytes, u64 empty_size) | |
0f9dd46c | 2103 | { |
34d52cb6 | 2104 | struct btrfs_free_space_ctl *ctl = block_group->free_space_ctl; |
6226cb0a | 2105 | struct btrfs_free_space *entry = NULL; |
96303081 | 2106 | u64 bytes_search = bytes + empty_size; |
6226cb0a | 2107 | u64 ret = 0; |
0f9dd46c | 2108 | |
34d52cb6 LZ |
2109 | spin_lock(&ctl->tree_lock); |
2110 | entry = find_free_space(ctl, &offset, &bytes_search); | |
6226cb0a | 2111 | if (!entry) |
96303081 JB |
2112 | goto out; |
2113 | ||
2114 | ret = offset; | |
2115 | if (entry->bitmap) { | |
34d52cb6 | 2116 | bitmap_clear_bits(ctl, entry, offset, bytes); |
edf6e2d1 | 2117 | if (!entry->bytes) |
34d52cb6 | 2118 | free_bitmap(ctl, entry); |
96303081 | 2119 | } else { |
34d52cb6 | 2120 | unlink_free_space(ctl, entry); |
6226cb0a JB |
2121 | entry->offset += bytes; |
2122 | entry->bytes -= bytes; | |
6226cb0a | 2123 | if (!entry->bytes) |
dc89e982 | 2124 | kmem_cache_free(btrfs_free_space_cachep, entry); |
6226cb0a | 2125 | else |
34d52cb6 | 2126 | link_free_space(ctl, entry); |
6226cb0a | 2127 | } |
0f9dd46c | 2128 | |
96303081 | 2129 | out: |
34d52cb6 | 2130 | spin_unlock(&ctl->tree_lock); |
817d52f8 | 2131 | |
0f9dd46c JB |
2132 | return ret; |
2133 | } | |
fa9c0d79 CM |
2134 | |
2135 | /* | |
2136 | * given a cluster, put all of its extents back into the free space | |
2137 | * cache. If a block group is passed, this function will only free | |
2138 | * a cluster that belongs to the passed block group. | |
2139 | * | |
2140 | * Otherwise, it'll get a reference on the block group pointed to by the | |
2141 | * cluster and remove the cluster from it. | |
2142 | */ | |
2143 | int btrfs_return_cluster_to_free_space( | |
2144 | struct btrfs_block_group_cache *block_group, | |
2145 | struct btrfs_free_cluster *cluster) | |
2146 | { | |
34d52cb6 | 2147 | struct btrfs_free_space_ctl *ctl; |
fa9c0d79 CM |
2148 | int ret; |
2149 | ||
2150 | /* first, get a safe pointer to the block group */ | |
2151 | spin_lock(&cluster->lock); | |
2152 | if (!block_group) { | |
2153 | block_group = cluster->block_group; | |
2154 | if (!block_group) { | |
2155 | spin_unlock(&cluster->lock); | |
2156 | return 0; | |
2157 | } | |
2158 | } else if (cluster->block_group != block_group) { | |
2159 | /* someone else has already freed it don't redo their work */ | |
2160 | spin_unlock(&cluster->lock); | |
2161 | return 0; | |
2162 | } | |
2163 | atomic_inc(&block_group->count); | |
2164 | spin_unlock(&cluster->lock); | |
2165 | ||
34d52cb6 LZ |
2166 | ctl = block_group->free_space_ctl; |
2167 | ||
fa9c0d79 | 2168 | /* now return any extents the cluster had on it */ |
34d52cb6 | 2169 | spin_lock(&ctl->tree_lock); |
fa9c0d79 | 2170 | ret = __btrfs_return_cluster_to_free_space(block_group, cluster); |
34d52cb6 | 2171 | spin_unlock(&ctl->tree_lock); |
fa9c0d79 CM |
2172 | |
2173 | /* finally drop our ref */ | |
2174 | btrfs_put_block_group(block_group); | |
2175 | return ret; | |
2176 | } | |
2177 | ||
96303081 JB |
2178 | static u64 btrfs_alloc_from_bitmap(struct btrfs_block_group_cache *block_group, |
2179 | struct btrfs_free_cluster *cluster, | |
4e69b598 | 2180 | struct btrfs_free_space *entry, |
96303081 JB |
2181 | u64 bytes, u64 min_start) |
2182 | { | |
34d52cb6 | 2183 | struct btrfs_free_space_ctl *ctl = block_group->free_space_ctl; |
96303081 JB |
2184 | int err; |
2185 | u64 search_start = cluster->window_start; | |
2186 | u64 search_bytes = bytes; | |
2187 | u64 ret = 0; | |
2188 | ||
96303081 JB |
2189 | search_start = min_start; |
2190 | search_bytes = bytes; | |
2191 | ||
34d52cb6 | 2192 | err = search_bitmap(ctl, entry, &search_start, &search_bytes); |
96303081 | 2193 | if (err) |
4e69b598 | 2194 | return 0; |
96303081 JB |
2195 | |
2196 | ret = search_start; | |
bb3ac5a4 | 2197 | __bitmap_clear_bits(ctl, entry, ret, bytes); |
96303081 JB |
2198 | |
2199 | return ret; | |
2200 | } | |
2201 | ||
fa9c0d79 CM |
2202 | /* |
2203 | * given a cluster, try to allocate 'bytes' from it, returns 0 | |
2204 | * if it couldn't find anything suitably large, or a logical disk offset | |
2205 | * if things worked out | |
2206 | */ | |
2207 | u64 btrfs_alloc_from_cluster(struct btrfs_block_group_cache *block_group, | |
2208 | struct btrfs_free_cluster *cluster, u64 bytes, | |
2209 | u64 min_start) | |
2210 | { | |
34d52cb6 | 2211 | struct btrfs_free_space_ctl *ctl = block_group->free_space_ctl; |
fa9c0d79 CM |
2212 | struct btrfs_free_space *entry = NULL; |
2213 | struct rb_node *node; | |
2214 | u64 ret = 0; | |
2215 | ||
2216 | spin_lock(&cluster->lock); | |
2217 | if (bytes > cluster->max_size) | |
2218 | goto out; | |
2219 | ||
2220 | if (cluster->block_group != block_group) | |
2221 | goto out; | |
2222 | ||
2223 | node = rb_first(&cluster->root); | |
2224 | if (!node) | |
2225 | goto out; | |
2226 | ||
2227 | entry = rb_entry(node, struct btrfs_free_space, offset_index); | |
fa9c0d79 | 2228 | while(1) { |
4e69b598 JB |
2229 | if (entry->bytes < bytes || |
2230 | (!entry->bitmap && entry->offset < min_start)) { | |
fa9c0d79 CM |
2231 | node = rb_next(&entry->offset_index); |
2232 | if (!node) | |
2233 | break; | |
2234 | entry = rb_entry(node, struct btrfs_free_space, | |
2235 | offset_index); | |
2236 | continue; | |
2237 | } | |
fa9c0d79 | 2238 | |
4e69b598 JB |
2239 | if (entry->bitmap) { |
2240 | ret = btrfs_alloc_from_bitmap(block_group, | |
2241 | cluster, entry, bytes, | |
0b4a9d24 | 2242 | cluster->window_start); |
4e69b598 | 2243 | if (ret == 0) { |
4e69b598 JB |
2244 | node = rb_next(&entry->offset_index); |
2245 | if (!node) | |
2246 | break; | |
2247 | entry = rb_entry(node, struct btrfs_free_space, | |
2248 | offset_index); | |
2249 | continue; | |
2250 | } | |
9b230628 | 2251 | cluster->window_start += bytes; |
4e69b598 | 2252 | } else { |
4e69b598 JB |
2253 | ret = entry->offset; |
2254 | ||
2255 | entry->offset += bytes; | |
2256 | entry->bytes -= bytes; | |
2257 | } | |
fa9c0d79 | 2258 | |
5e71b5d5 | 2259 | if (entry->bytes == 0) |
fa9c0d79 | 2260 | rb_erase(&entry->offset_index, &cluster->root); |
fa9c0d79 CM |
2261 | break; |
2262 | } | |
2263 | out: | |
2264 | spin_unlock(&cluster->lock); | |
96303081 | 2265 | |
5e71b5d5 LZ |
2266 | if (!ret) |
2267 | return 0; | |
2268 | ||
34d52cb6 | 2269 | spin_lock(&ctl->tree_lock); |
5e71b5d5 | 2270 | |
34d52cb6 | 2271 | ctl->free_space -= bytes; |
5e71b5d5 | 2272 | if (entry->bytes == 0) { |
34d52cb6 | 2273 | ctl->free_extents--; |
4e69b598 JB |
2274 | if (entry->bitmap) { |
2275 | kfree(entry->bitmap); | |
34d52cb6 LZ |
2276 | ctl->total_bitmaps--; |
2277 | ctl->op->recalc_thresholds(ctl); | |
4e69b598 | 2278 | } |
dc89e982 | 2279 | kmem_cache_free(btrfs_free_space_cachep, entry); |
5e71b5d5 LZ |
2280 | } |
2281 | ||
34d52cb6 | 2282 | spin_unlock(&ctl->tree_lock); |
5e71b5d5 | 2283 | |
fa9c0d79 CM |
2284 | return ret; |
2285 | } | |
2286 | ||
96303081 JB |
2287 | static int btrfs_bitmap_cluster(struct btrfs_block_group_cache *block_group, |
2288 | struct btrfs_free_space *entry, | |
2289 | struct btrfs_free_cluster *cluster, | |
1bb91902 AO |
2290 | u64 offset, u64 bytes, |
2291 | u64 cont1_bytes, u64 min_bytes) | |
96303081 | 2292 | { |
34d52cb6 | 2293 | struct btrfs_free_space_ctl *ctl = block_group->free_space_ctl; |
96303081 JB |
2294 | unsigned long next_zero; |
2295 | unsigned long i; | |
1bb91902 AO |
2296 | unsigned long want_bits; |
2297 | unsigned long min_bits; | |
96303081 JB |
2298 | unsigned long found_bits; |
2299 | unsigned long start = 0; | |
2300 | unsigned long total_found = 0; | |
4e69b598 | 2301 | int ret; |
96303081 JB |
2302 | |
2303 | i = offset_to_bit(entry->offset, block_group->sectorsize, | |
2304 | max_t(u64, offset, entry->offset)); | |
1bb91902 AO |
2305 | want_bits = bytes_to_bits(bytes, block_group->sectorsize); |
2306 | min_bits = bytes_to_bits(min_bytes, block_group->sectorsize); | |
96303081 JB |
2307 | |
2308 | again: | |
2309 | found_bits = 0; | |
2310 | for (i = find_next_bit(entry->bitmap, BITS_PER_BITMAP, i); | |
2311 | i < BITS_PER_BITMAP; | |
2312 | i = find_next_bit(entry->bitmap, BITS_PER_BITMAP, i + 1)) { | |
2313 | next_zero = find_next_zero_bit(entry->bitmap, | |
2314 | BITS_PER_BITMAP, i); | |
1bb91902 | 2315 | if (next_zero - i >= min_bits) { |
96303081 JB |
2316 | found_bits = next_zero - i; |
2317 | break; | |
2318 | } | |
2319 | i = next_zero; | |
2320 | } | |
2321 | ||
2322 | if (!found_bits) | |
4e69b598 | 2323 | return -ENOSPC; |
96303081 | 2324 | |
1bb91902 | 2325 | if (!total_found) { |
96303081 | 2326 | start = i; |
b78d09bc | 2327 | cluster->max_size = 0; |
96303081 JB |
2328 | } |
2329 | ||
2330 | total_found += found_bits; | |
2331 | ||
2332 | if (cluster->max_size < found_bits * block_group->sectorsize) | |
2333 | cluster->max_size = found_bits * block_group->sectorsize; | |
2334 | ||
1bb91902 AO |
2335 | if (total_found < want_bits || cluster->max_size < cont1_bytes) { |
2336 | i = next_zero + 1; | |
96303081 JB |
2337 | goto again; |
2338 | } | |
2339 | ||
2340 | cluster->window_start = start * block_group->sectorsize + | |
2341 | entry->offset; | |
34d52cb6 | 2342 | rb_erase(&entry->offset_index, &ctl->free_space_offset); |
4e69b598 JB |
2343 | ret = tree_insert_offset(&cluster->root, entry->offset, |
2344 | &entry->offset_index, 1); | |
79787eaa | 2345 | BUG_ON(ret); /* -EEXIST; Logic error */ |
96303081 | 2346 | |
3f7de037 JB |
2347 | trace_btrfs_setup_cluster(block_group, cluster, |
2348 | total_found * block_group->sectorsize, 1); | |
96303081 JB |
2349 | return 0; |
2350 | } | |
2351 | ||
4e69b598 JB |
2352 | /* |
2353 | * This searches the block group for just extents to fill the cluster with. | |
1bb91902 AO |
2354 | * Try to find a cluster with at least bytes total bytes, at least one |
2355 | * extent of cont1_bytes, and other clusters of at least min_bytes. | |
4e69b598 | 2356 | */ |
3de85bb9 JB |
2357 | static noinline int |
2358 | setup_cluster_no_bitmap(struct btrfs_block_group_cache *block_group, | |
2359 | struct btrfs_free_cluster *cluster, | |
2360 | struct list_head *bitmaps, u64 offset, u64 bytes, | |
1bb91902 | 2361 | u64 cont1_bytes, u64 min_bytes) |
4e69b598 | 2362 | { |
34d52cb6 | 2363 | struct btrfs_free_space_ctl *ctl = block_group->free_space_ctl; |
4e69b598 JB |
2364 | struct btrfs_free_space *first = NULL; |
2365 | struct btrfs_free_space *entry = NULL; | |
4e69b598 JB |
2366 | struct btrfs_free_space *last; |
2367 | struct rb_node *node; | |
2368 | u64 window_start; | |
2369 | u64 window_free; | |
2370 | u64 max_extent; | |
3f7de037 | 2371 | u64 total_size = 0; |
4e69b598 | 2372 | |
34d52cb6 | 2373 | entry = tree_search_offset(ctl, offset, 0, 1); |
4e69b598 JB |
2374 | if (!entry) |
2375 | return -ENOSPC; | |
2376 | ||
2377 | /* | |
2378 | * We don't want bitmaps, so just move along until we find a normal | |
2379 | * extent entry. | |
2380 | */ | |
1bb91902 AO |
2381 | while (entry->bitmap || entry->bytes < min_bytes) { |
2382 | if (entry->bitmap && list_empty(&entry->list)) | |
86d4a77b | 2383 | list_add_tail(&entry->list, bitmaps); |
4e69b598 JB |
2384 | node = rb_next(&entry->offset_index); |
2385 | if (!node) | |
2386 | return -ENOSPC; | |
2387 | entry = rb_entry(node, struct btrfs_free_space, offset_index); | |
2388 | } | |
2389 | ||
2390 | window_start = entry->offset; | |
2391 | window_free = entry->bytes; | |
2392 | max_extent = entry->bytes; | |
2393 | first = entry; | |
2394 | last = entry; | |
4e69b598 | 2395 | |
1bb91902 AO |
2396 | for (node = rb_next(&entry->offset_index); node; |
2397 | node = rb_next(&entry->offset_index)) { | |
4e69b598 JB |
2398 | entry = rb_entry(node, struct btrfs_free_space, offset_index); |
2399 | ||
86d4a77b JB |
2400 | if (entry->bitmap) { |
2401 | if (list_empty(&entry->list)) | |
2402 | list_add_tail(&entry->list, bitmaps); | |
4e69b598 | 2403 | continue; |
86d4a77b JB |
2404 | } |
2405 | ||
1bb91902 AO |
2406 | if (entry->bytes < min_bytes) |
2407 | continue; | |
2408 | ||
2409 | last = entry; | |
2410 | window_free += entry->bytes; | |
2411 | if (entry->bytes > max_extent) | |
4e69b598 | 2412 | max_extent = entry->bytes; |
4e69b598 JB |
2413 | } |
2414 | ||
1bb91902 AO |
2415 | if (window_free < bytes || max_extent < cont1_bytes) |
2416 | return -ENOSPC; | |
2417 | ||
4e69b598 JB |
2418 | cluster->window_start = first->offset; |
2419 | ||
2420 | node = &first->offset_index; | |
2421 | ||
2422 | /* | |
2423 | * now we've found our entries, pull them out of the free space | |
2424 | * cache and put them into the cluster rbtree | |
2425 | */ | |
2426 | do { | |
2427 | int ret; | |
2428 | ||
2429 | entry = rb_entry(node, struct btrfs_free_space, offset_index); | |
2430 | node = rb_next(&entry->offset_index); | |
1bb91902 | 2431 | if (entry->bitmap || entry->bytes < min_bytes) |
4e69b598 JB |
2432 | continue; |
2433 | ||
34d52cb6 | 2434 | rb_erase(&entry->offset_index, &ctl->free_space_offset); |
4e69b598 JB |
2435 | ret = tree_insert_offset(&cluster->root, entry->offset, |
2436 | &entry->offset_index, 0); | |
3f7de037 | 2437 | total_size += entry->bytes; |
79787eaa | 2438 | BUG_ON(ret); /* -EEXIST; Logic error */ |
4e69b598 JB |
2439 | } while (node && entry != last); |
2440 | ||
2441 | cluster->max_size = max_extent; | |
3f7de037 | 2442 | trace_btrfs_setup_cluster(block_group, cluster, total_size, 0); |
4e69b598 JB |
2443 | return 0; |
2444 | } | |
2445 | ||
2446 | /* | |
2447 | * This specifically looks for bitmaps that may work in the cluster, we assume | |
2448 | * that we have already failed to find extents that will work. | |
2449 | */ | |
3de85bb9 JB |
2450 | static noinline int |
2451 | setup_cluster_bitmap(struct btrfs_block_group_cache *block_group, | |
2452 | struct btrfs_free_cluster *cluster, | |
2453 | struct list_head *bitmaps, u64 offset, u64 bytes, | |
1bb91902 | 2454 | u64 cont1_bytes, u64 min_bytes) |
4e69b598 | 2455 | { |
34d52cb6 | 2456 | struct btrfs_free_space_ctl *ctl = block_group->free_space_ctl; |
4e69b598 | 2457 | struct btrfs_free_space *entry; |
4e69b598 | 2458 | int ret = -ENOSPC; |
0f0fbf1d | 2459 | u64 bitmap_offset = offset_to_bitmap(ctl, offset); |
4e69b598 | 2460 | |
34d52cb6 | 2461 | if (ctl->total_bitmaps == 0) |
4e69b598 JB |
2462 | return -ENOSPC; |
2463 | ||
0f0fbf1d LZ |
2464 | /* |
2465 | * The bitmap that covers offset won't be in the list unless offset | |
2466 | * is just its start offset. | |
2467 | */ | |
2468 | entry = list_first_entry(bitmaps, struct btrfs_free_space, list); | |
2469 | if (entry->offset != bitmap_offset) { | |
2470 | entry = tree_search_offset(ctl, bitmap_offset, 1, 0); | |
2471 | if (entry && list_empty(&entry->list)) | |
2472 | list_add(&entry->list, bitmaps); | |
2473 | } | |
2474 | ||
86d4a77b | 2475 | list_for_each_entry(entry, bitmaps, list) { |
357b9784 | 2476 | if (entry->bytes < bytes) |
86d4a77b JB |
2477 | continue; |
2478 | ret = btrfs_bitmap_cluster(block_group, entry, cluster, offset, | |
1bb91902 | 2479 | bytes, cont1_bytes, min_bytes); |
86d4a77b JB |
2480 | if (!ret) |
2481 | return 0; | |
2482 | } | |
2483 | ||
2484 | /* | |
52621cb6 LZ |
2485 | * The bitmaps list has all the bitmaps that record free space |
2486 | * starting after offset, so no more search is required. | |
86d4a77b | 2487 | */ |
52621cb6 | 2488 | return -ENOSPC; |
4e69b598 JB |
2489 | } |
2490 | ||
fa9c0d79 CM |
2491 | /* |
2492 | * here we try to find a cluster of blocks in a block group. The goal | |
1bb91902 | 2493 | * is to find at least bytes+empty_size. |
fa9c0d79 CM |
2494 | * We might not find them all in one contiguous area. |
2495 | * | |
2496 | * returns zero and sets up cluster if things worked out, otherwise | |
2497 | * it returns -enospc | |
2498 | */ | |
2499 | int btrfs_find_space_cluster(struct btrfs_trans_handle *trans, | |
451d7585 | 2500 | struct btrfs_root *root, |
fa9c0d79 CM |
2501 | struct btrfs_block_group_cache *block_group, |
2502 | struct btrfs_free_cluster *cluster, | |
2503 | u64 offset, u64 bytes, u64 empty_size) | |
2504 | { | |
34d52cb6 | 2505 | struct btrfs_free_space_ctl *ctl = block_group->free_space_ctl; |
86d4a77b | 2506 | struct btrfs_free_space *entry, *tmp; |
52621cb6 | 2507 | LIST_HEAD(bitmaps); |
fa9c0d79 | 2508 | u64 min_bytes; |
1bb91902 | 2509 | u64 cont1_bytes; |
fa9c0d79 CM |
2510 | int ret; |
2511 | ||
1bb91902 AO |
2512 | /* |
2513 | * Choose the minimum extent size we'll require for this | |
2514 | * cluster. For SSD_SPREAD, don't allow any fragmentation. | |
2515 | * For metadata, allow allocates with smaller extents. For | |
2516 | * data, keep it dense. | |
2517 | */ | |
451d7585 | 2518 | if (btrfs_test_opt(root, SSD_SPREAD)) { |
1bb91902 | 2519 | cont1_bytes = min_bytes = bytes + empty_size; |
451d7585 | 2520 | } else if (block_group->flags & BTRFS_BLOCK_GROUP_METADATA) { |
1bb91902 AO |
2521 | cont1_bytes = bytes; |
2522 | min_bytes = block_group->sectorsize; | |
2523 | } else { | |
2524 | cont1_bytes = max(bytes, (bytes + empty_size) >> 2); | |
2525 | min_bytes = block_group->sectorsize; | |
2526 | } | |
fa9c0d79 | 2527 | |
34d52cb6 | 2528 | spin_lock(&ctl->tree_lock); |
7d0d2e8e JB |
2529 | |
2530 | /* | |
2531 | * If we know we don't have enough space to make a cluster don't even | |
2532 | * bother doing all the work to try and find one. | |
2533 | */ | |
1bb91902 | 2534 | if (ctl->free_space < bytes) { |
34d52cb6 | 2535 | spin_unlock(&ctl->tree_lock); |
7d0d2e8e JB |
2536 | return -ENOSPC; |
2537 | } | |
2538 | ||
fa9c0d79 CM |
2539 | spin_lock(&cluster->lock); |
2540 | ||
2541 | /* someone already found a cluster, hooray */ | |
2542 | if (cluster->block_group) { | |
2543 | ret = 0; | |
2544 | goto out; | |
2545 | } | |
fa9c0d79 | 2546 | |
3f7de037 JB |
2547 | trace_btrfs_find_cluster(block_group, offset, bytes, empty_size, |
2548 | min_bytes); | |
2549 | ||
2550 | INIT_LIST_HEAD(&bitmaps); | |
86d4a77b | 2551 | ret = setup_cluster_no_bitmap(block_group, cluster, &bitmaps, offset, |
1bb91902 AO |
2552 | bytes + empty_size, |
2553 | cont1_bytes, min_bytes); | |
4e69b598 | 2554 | if (ret) |
86d4a77b | 2555 | ret = setup_cluster_bitmap(block_group, cluster, &bitmaps, |
1bb91902 AO |
2556 | offset, bytes + empty_size, |
2557 | cont1_bytes, min_bytes); | |
86d4a77b JB |
2558 | |
2559 | /* Clear our temporary list */ | |
2560 | list_for_each_entry_safe(entry, tmp, &bitmaps, list) | |
2561 | list_del_init(&entry->list); | |
fa9c0d79 | 2562 | |
4e69b598 JB |
2563 | if (!ret) { |
2564 | atomic_inc(&block_group->count); | |
2565 | list_add_tail(&cluster->block_group_list, | |
2566 | &block_group->cluster_list); | |
2567 | cluster->block_group = block_group; | |
3f7de037 JB |
2568 | } else { |
2569 | trace_btrfs_failed_cluster_setup(block_group); | |
fa9c0d79 | 2570 | } |
fa9c0d79 CM |
2571 | out: |
2572 | spin_unlock(&cluster->lock); | |
34d52cb6 | 2573 | spin_unlock(&ctl->tree_lock); |
fa9c0d79 CM |
2574 | |
2575 | return ret; | |
2576 | } | |
2577 | ||
2578 | /* | |
2579 | * simple code to zero out a cluster | |
2580 | */ | |
2581 | void btrfs_init_free_cluster(struct btrfs_free_cluster *cluster) | |
2582 | { | |
2583 | spin_lock_init(&cluster->lock); | |
2584 | spin_lock_init(&cluster->refill_lock); | |
6bef4d31 | 2585 | cluster->root = RB_ROOT; |
fa9c0d79 CM |
2586 | cluster->max_size = 0; |
2587 | INIT_LIST_HEAD(&cluster->block_group_list); | |
2588 | cluster->block_group = NULL; | |
2589 | } | |
2590 | ||
7fe1e641 LZ |
2591 | static int do_trimming(struct btrfs_block_group_cache *block_group, |
2592 | u64 *total_trimmed, u64 start, u64 bytes, | |
2593 | u64 reserved_start, u64 reserved_bytes) | |
f7039b1d | 2594 | { |
7fe1e641 | 2595 | struct btrfs_space_info *space_info = block_group->space_info; |
f7039b1d | 2596 | struct btrfs_fs_info *fs_info = block_group->fs_info; |
7fe1e641 LZ |
2597 | int ret; |
2598 | int update = 0; | |
2599 | u64 trimmed = 0; | |
f7039b1d | 2600 | |
7fe1e641 LZ |
2601 | spin_lock(&space_info->lock); |
2602 | spin_lock(&block_group->lock); | |
2603 | if (!block_group->ro) { | |
2604 | block_group->reserved += reserved_bytes; | |
2605 | space_info->bytes_reserved += reserved_bytes; | |
2606 | update = 1; | |
2607 | } | |
2608 | spin_unlock(&block_group->lock); | |
2609 | spin_unlock(&space_info->lock); | |
2610 | ||
2611 | ret = btrfs_error_discard_extent(fs_info->extent_root, | |
2612 | start, bytes, &trimmed); | |
2613 | if (!ret) | |
2614 | *total_trimmed += trimmed; | |
2615 | ||
2616 | btrfs_add_free_space(block_group, reserved_start, reserved_bytes); | |
2617 | ||
2618 | if (update) { | |
2619 | spin_lock(&space_info->lock); | |
2620 | spin_lock(&block_group->lock); | |
2621 | if (block_group->ro) | |
2622 | space_info->bytes_readonly += reserved_bytes; | |
2623 | block_group->reserved -= reserved_bytes; | |
2624 | space_info->bytes_reserved -= reserved_bytes; | |
2625 | spin_unlock(&space_info->lock); | |
2626 | spin_unlock(&block_group->lock); | |
2627 | } | |
2628 | ||
2629 | return ret; | |
2630 | } | |
2631 | ||
2632 | static int trim_no_bitmap(struct btrfs_block_group_cache *block_group, | |
2633 | u64 *total_trimmed, u64 start, u64 end, u64 minlen) | |
2634 | { | |
2635 | struct btrfs_free_space_ctl *ctl = block_group->free_space_ctl; | |
2636 | struct btrfs_free_space *entry; | |
2637 | struct rb_node *node; | |
2638 | int ret = 0; | |
2639 | u64 extent_start; | |
2640 | u64 extent_bytes; | |
2641 | u64 bytes; | |
f7039b1d LD |
2642 | |
2643 | while (start < end) { | |
34d52cb6 | 2644 | spin_lock(&ctl->tree_lock); |
f7039b1d | 2645 | |
34d52cb6 LZ |
2646 | if (ctl->free_space < minlen) { |
2647 | spin_unlock(&ctl->tree_lock); | |
f7039b1d LD |
2648 | break; |
2649 | } | |
2650 | ||
34d52cb6 | 2651 | entry = tree_search_offset(ctl, start, 0, 1); |
7fe1e641 | 2652 | if (!entry) { |
34d52cb6 | 2653 | spin_unlock(&ctl->tree_lock); |
f7039b1d LD |
2654 | break; |
2655 | } | |
2656 | ||
7fe1e641 LZ |
2657 | /* skip bitmaps */ |
2658 | while (entry->bitmap) { | |
2659 | node = rb_next(&entry->offset_index); | |
2660 | if (!node) { | |
34d52cb6 | 2661 | spin_unlock(&ctl->tree_lock); |
7fe1e641 | 2662 | goto out; |
f7039b1d | 2663 | } |
7fe1e641 LZ |
2664 | entry = rb_entry(node, struct btrfs_free_space, |
2665 | offset_index); | |
f7039b1d LD |
2666 | } |
2667 | ||
7fe1e641 LZ |
2668 | if (entry->offset >= end) { |
2669 | spin_unlock(&ctl->tree_lock); | |
2670 | break; | |
f7039b1d LD |
2671 | } |
2672 | ||
7fe1e641 LZ |
2673 | extent_start = entry->offset; |
2674 | extent_bytes = entry->bytes; | |
2675 | start = max(start, extent_start); | |
2676 | bytes = min(extent_start + extent_bytes, end) - start; | |
2677 | if (bytes < minlen) { | |
2678 | spin_unlock(&ctl->tree_lock); | |
2679 | goto next; | |
f7039b1d LD |
2680 | } |
2681 | ||
7fe1e641 LZ |
2682 | unlink_free_space(ctl, entry); |
2683 | kmem_cache_free(btrfs_free_space_cachep, entry); | |
2684 | ||
34d52cb6 | 2685 | spin_unlock(&ctl->tree_lock); |
f7039b1d | 2686 | |
7fe1e641 LZ |
2687 | ret = do_trimming(block_group, total_trimmed, start, bytes, |
2688 | extent_start, extent_bytes); | |
2689 | if (ret) | |
2690 | break; | |
2691 | next: | |
2692 | start += bytes; | |
f7039b1d | 2693 | |
7fe1e641 LZ |
2694 | if (fatal_signal_pending(current)) { |
2695 | ret = -ERESTARTSYS; | |
2696 | break; | |
2697 | } | |
2698 | ||
2699 | cond_resched(); | |
2700 | } | |
2701 | out: | |
2702 | return ret; | |
2703 | } | |
2704 | ||
2705 | static int trim_bitmaps(struct btrfs_block_group_cache *block_group, | |
2706 | u64 *total_trimmed, u64 start, u64 end, u64 minlen) | |
2707 | { | |
2708 | struct btrfs_free_space_ctl *ctl = block_group->free_space_ctl; | |
2709 | struct btrfs_free_space *entry; | |
2710 | int ret = 0; | |
2711 | int ret2; | |
2712 | u64 bytes; | |
2713 | u64 offset = offset_to_bitmap(ctl, start); | |
2714 | ||
2715 | while (offset < end) { | |
2716 | bool next_bitmap = false; | |
2717 | ||
2718 | spin_lock(&ctl->tree_lock); | |
2719 | ||
2720 | if (ctl->free_space < minlen) { | |
2721 | spin_unlock(&ctl->tree_lock); | |
2722 | break; | |
2723 | } | |
2724 | ||
2725 | entry = tree_search_offset(ctl, offset, 1, 0); | |
2726 | if (!entry) { | |
2727 | spin_unlock(&ctl->tree_lock); | |
2728 | next_bitmap = true; | |
2729 | goto next; | |
2730 | } | |
2731 | ||
2732 | bytes = minlen; | |
2733 | ret2 = search_bitmap(ctl, entry, &start, &bytes); | |
2734 | if (ret2 || start >= end) { | |
2735 | spin_unlock(&ctl->tree_lock); | |
2736 | next_bitmap = true; | |
2737 | goto next; | |
2738 | } | |
2739 | ||
2740 | bytes = min(bytes, end - start); | |
2741 | if (bytes < minlen) { | |
2742 | spin_unlock(&ctl->tree_lock); | |
2743 | goto next; | |
2744 | } | |
2745 | ||
2746 | bitmap_clear_bits(ctl, entry, start, bytes); | |
2747 | if (entry->bytes == 0) | |
2748 | free_bitmap(ctl, entry); | |
2749 | ||
2750 | spin_unlock(&ctl->tree_lock); | |
2751 | ||
2752 | ret = do_trimming(block_group, total_trimmed, start, bytes, | |
2753 | start, bytes); | |
2754 | if (ret) | |
2755 | break; | |
2756 | next: | |
2757 | if (next_bitmap) { | |
2758 | offset += BITS_PER_BITMAP * ctl->unit; | |
2759 | } else { | |
2760 | start += bytes; | |
2761 | if (start >= offset + BITS_PER_BITMAP * ctl->unit) | |
2762 | offset += BITS_PER_BITMAP * ctl->unit; | |
f7039b1d | 2763 | } |
f7039b1d LD |
2764 | |
2765 | if (fatal_signal_pending(current)) { | |
2766 | ret = -ERESTARTSYS; | |
2767 | break; | |
2768 | } | |
2769 | ||
2770 | cond_resched(); | |
2771 | } | |
2772 | ||
2773 | return ret; | |
2774 | } | |
581bb050 | 2775 | |
7fe1e641 LZ |
2776 | int btrfs_trim_block_group(struct btrfs_block_group_cache *block_group, |
2777 | u64 *trimmed, u64 start, u64 end, u64 minlen) | |
2778 | { | |
2779 | int ret; | |
2780 | ||
2781 | *trimmed = 0; | |
2782 | ||
2783 | ret = trim_no_bitmap(block_group, trimmed, start, end, minlen); | |
2784 | if (ret) | |
2785 | return ret; | |
2786 | ||
2787 | ret = trim_bitmaps(block_group, trimmed, start, end, minlen); | |
2788 | ||
2789 | return ret; | |
2790 | } | |
2791 | ||
581bb050 LZ |
2792 | /* |
2793 | * Find the left-most item in the cache tree, and then return the | |
2794 | * smallest inode number in the item. | |
2795 | * | |
2796 | * Note: the returned inode number may not be the smallest one in | |
2797 | * the tree, if the left-most item is a bitmap. | |
2798 | */ | |
2799 | u64 btrfs_find_ino_for_alloc(struct btrfs_root *fs_root) | |
2800 | { | |
2801 | struct btrfs_free_space_ctl *ctl = fs_root->free_ino_ctl; | |
2802 | struct btrfs_free_space *entry = NULL; | |
2803 | u64 ino = 0; | |
2804 | ||
2805 | spin_lock(&ctl->tree_lock); | |
2806 | ||
2807 | if (RB_EMPTY_ROOT(&ctl->free_space_offset)) | |
2808 | goto out; | |
2809 | ||
2810 | entry = rb_entry(rb_first(&ctl->free_space_offset), | |
2811 | struct btrfs_free_space, offset_index); | |
2812 | ||
2813 | if (!entry->bitmap) { | |
2814 | ino = entry->offset; | |
2815 | ||
2816 | unlink_free_space(ctl, entry); | |
2817 | entry->offset++; | |
2818 | entry->bytes--; | |
2819 | if (!entry->bytes) | |
2820 | kmem_cache_free(btrfs_free_space_cachep, entry); | |
2821 | else | |
2822 | link_free_space(ctl, entry); | |
2823 | } else { | |
2824 | u64 offset = 0; | |
2825 | u64 count = 1; | |
2826 | int ret; | |
2827 | ||
2828 | ret = search_bitmap(ctl, entry, &offset, &count); | |
79787eaa | 2829 | /* Logic error; Should be empty if it can't find anything */ |
581bb050 LZ |
2830 | BUG_ON(ret); |
2831 | ||
2832 | ino = offset; | |
2833 | bitmap_clear_bits(ctl, entry, offset, 1); | |
2834 | if (entry->bytes == 0) | |
2835 | free_bitmap(ctl, entry); | |
2836 | } | |
2837 | out: | |
2838 | spin_unlock(&ctl->tree_lock); | |
2839 | ||
2840 | return ino; | |
2841 | } | |
82d5902d LZ |
2842 | |
2843 | struct inode *lookup_free_ino_inode(struct btrfs_root *root, | |
2844 | struct btrfs_path *path) | |
2845 | { | |
2846 | struct inode *inode = NULL; | |
2847 | ||
2848 | spin_lock(&root->cache_lock); | |
2849 | if (root->cache_inode) | |
2850 | inode = igrab(root->cache_inode); | |
2851 | spin_unlock(&root->cache_lock); | |
2852 | if (inode) | |
2853 | return inode; | |
2854 | ||
2855 | inode = __lookup_free_space_inode(root, path, 0); | |
2856 | if (IS_ERR(inode)) | |
2857 | return inode; | |
2858 | ||
2859 | spin_lock(&root->cache_lock); | |
7841cb28 | 2860 | if (!btrfs_fs_closing(root->fs_info)) |
82d5902d LZ |
2861 | root->cache_inode = igrab(inode); |
2862 | spin_unlock(&root->cache_lock); | |
2863 | ||
2864 | return inode; | |
2865 | } | |
2866 | ||
2867 | int create_free_ino_inode(struct btrfs_root *root, | |
2868 | struct btrfs_trans_handle *trans, | |
2869 | struct btrfs_path *path) | |
2870 | { | |
2871 | return __create_free_space_inode(root, trans, path, | |
2872 | BTRFS_FREE_INO_OBJECTID, 0); | |
2873 | } | |
2874 | ||
2875 | int load_free_ino_cache(struct btrfs_fs_info *fs_info, struct btrfs_root *root) | |
2876 | { | |
2877 | struct btrfs_free_space_ctl *ctl = root->free_ino_ctl; | |
2878 | struct btrfs_path *path; | |
2879 | struct inode *inode; | |
2880 | int ret = 0; | |
2881 | u64 root_gen = btrfs_root_generation(&root->root_item); | |
2882 | ||
4b9465cb CM |
2883 | if (!btrfs_test_opt(root, INODE_MAP_CACHE)) |
2884 | return 0; | |
2885 | ||
82d5902d LZ |
2886 | /* |
2887 | * If we're unmounting then just return, since this does a search on the | |
2888 | * normal root and not the commit root and we could deadlock. | |
2889 | */ | |
7841cb28 | 2890 | if (btrfs_fs_closing(fs_info)) |
82d5902d LZ |
2891 | return 0; |
2892 | ||
2893 | path = btrfs_alloc_path(); | |
2894 | if (!path) | |
2895 | return 0; | |
2896 | ||
2897 | inode = lookup_free_ino_inode(root, path); | |
2898 | if (IS_ERR(inode)) | |
2899 | goto out; | |
2900 | ||
2901 | if (root_gen != BTRFS_I(inode)->generation) | |
2902 | goto out_put; | |
2903 | ||
2904 | ret = __load_free_space_cache(root, inode, ctl, path, 0); | |
2905 | ||
2906 | if (ret < 0) | |
2907 | printk(KERN_ERR "btrfs: failed to load free ino cache for " | |
2908 | "root %llu\n", root->root_key.objectid); | |
2909 | out_put: | |
2910 | iput(inode); | |
2911 | out: | |
2912 | btrfs_free_path(path); | |
2913 | return ret; | |
2914 | } | |
2915 | ||
2916 | int btrfs_write_out_ino_cache(struct btrfs_root *root, | |
2917 | struct btrfs_trans_handle *trans, | |
2918 | struct btrfs_path *path) | |
2919 | { | |
2920 | struct btrfs_free_space_ctl *ctl = root->free_ino_ctl; | |
2921 | struct inode *inode; | |
2922 | int ret; | |
2923 | ||
4b9465cb CM |
2924 | if (!btrfs_test_opt(root, INODE_MAP_CACHE)) |
2925 | return 0; | |
2926 | ||
82d5902d LZ |
2927 | inode = lookup_free_ino_inode(root, path); |
2928 | if (IS_ERR(inode)) | |
2929 | return 0; | |
2930 | ||
2931 | ret = __btrfs_write_out_cache(root, inode, ctl, NULL, trans, path, 0); | |
c09544e0 JB |
2932 | if (ret) { |
2933 | btrfs_delalloc_release_metadata(inode, inode->i_size); | |
2934 | #ifdef DEBUG | |
82d5902d LZ |
2935 | printk(KERN_ERR "btrfs: failed to write free ino cache " |
2936 | "for root %llu\n", root->root_key.objectid); | |
c09544e0 JB |
2937 | #endif |
2938 | } | |
82d5902d LZ |
2939 | |
2940 | iput(inode); | |
2941 | return ret; | |
2942 | } |