Commit | Line | Data |
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6cbd5570 CM |
1 | /* |
2 | * Copyright (C) 2007 Oracle. All rights reserved. | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or | |
5 | * modify it under the terms of the GNU General Public | |
6 | * License v2 as published by the Free Software Foundation. | |
7 | * | |
8 | * This program is distributed in the hope that it will be useful, | |
9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
11 | * General Public License for more details. | |
12 | * | |
13 | * You should have received a copy of the GNU General Public | |
14 | * License along with this program; if not, write to the | |
15 | * Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
16 | * Boston, MA 021110-1307, USA. | |
17 | */ | |
18 | ||
ec6b910f | 19 | #include <linux/sched.h> |
7bb86316 | 20 | #include <linux/crc32c.h> |
edbd8d4e | 21 | #include <linux/pagemap.h> |
74493f7a | 22 | #include "hash.h" |
fec577fb CM |
23 | #include "ctree.h" |
24 | #include "disk-io.h" | |
25 | #include "print-tree.h" | |
e089f05c | 26 | #include "transaction.h" |
fec577fb | 27 | |
96b5179d CM |
28 | #define BLOCK_GROUP_DATA EXTENT_WRITEBACK |
29 | #define BLOCK_GROUP_METADATA EXTENT_UPTODATE | |
30 | #define BLOCK_GROUP_DIRTY EXTENT_DIRTY | |
31 | ||
e089f05c CM |
32 | static int finish_current_insert(struct btrfs_trans_handle *trans, struct |
33 | btrfs_root *extent_root); | |
e20d96d6 CM |
34 | static int del_pending_extents(struct btrfs_trans_handle *trans, struct |
35 | btrfs_root *extent_root); | |
fec577fb | 36 | |
e37c9e69 CM |
37 | static int cache_block_group(struct btrfs_root *root, |
38 | struct btrfs_block_group_cache *block_group) | |
39 | { | |
40 | struct btrfs_path *path; | |
41 | int ret; | |
42 | struct btrfs_key key; | |
5f39d397 | 43 | struct extent_buffer *leaf; |
f510cfec | 44 | struct extent_map_tree *free_space_cache; |
e37c9e69 | 45 | int slot; |
e37c9e69 CM |
46 | u64 last = 0; |
47 | u64 hole_size; | |
7d7d6068 | 48 | u64 first_free; |
e37c9e69 CM |
49 | int found = 0; |
50 | ||
00f5c795 CM |
51 | if (!block_group) |
52 | return 0; | |
53 | ||
e37c9e69 | 54 | root = root->fs_info->extent_root; |
f510cfec | 55 | free_space_cache = &root->fs_info->free_space_cache; |
e37c9e69 CM |
56 | |
57 | if (block_group->cached) | |
58 | return 0; | |
f510cfec | 59 | |
e37c9e69 CM |
60 | path = btrfs_alloc_path(); |
61 | if (!path) | |
62 | return -ENOMEM; | |
7d7d6068 | 63 | |
2cc58cf2 | 64 | path->reada = 2; |
7d7d6068 | 65 | first_free = block_group->key.objectid; |
e37c9e69 | 66 | key.objectid = block_group->key.objectid; |
e37c9e69 | 67 | key.offset = 0; |
7d7d6068 | 68 | |
e37c9e69 CM |
69 | btrfs_set_key_type(&key, BTRFS_EXTENT_ITEM_KEY); |
70 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); | |
7d7d6068 | 71 | |
e37c9e69 CM |
72 | if (ret < 0) |
73 | return ret; | |
7d7d6068 | 74 | |
e37c9e69 CM |
75 | if (ret && path->slots[0] > 0) |
76 | path->slots[0]--; | |
7d7d6068 | 77 | |
e37c9e69 | 78 | while(1) { |
5f39d397 | 79 | leaf = path->nodes[0]; |
e37c9e69 | 80 | slot = path->slots[0]; |
5f39d397 | 81 | if (slot >= btrfs_header_nritems(leaf)) { |
e37c9e69 | 82 | ret = btrfs_next_leaf(root, path); |
54aa1f4d CM |
83 | if (ret < 0) |
84 | goto err; | |
de428b63 | 85 | if (ret == 0) { |
e37c9e69 | 86 | continue; |
de428b63 | 87 | } else { |
e37c9e69 CM |
88 | break; |
89 | } | |
90 | } | |
7d7d6068 | 91 | |
5f39d397 | 92 | btrfs_item_key_to_cpu(leaf, &key, slot); |
7d7d6068 | 93 | if (key.objectid < block_group->key.objectid) { |
7bb86316 CM |
94 | if (btrfs_key_type(&key) != BTRFS_EXTENT_REF_KEY && |
95 | key.objectid + key.offset > first_free) | |
7d7d6068 Y |
96 | first_free = key.objectid + key.offset; |
97 | goto next; | |
98 | } | |
99 | ||
e37c9e69 CM |
100 | if (key.objectid >= block_group->key.objectid + |
101 | block_group->key.offset) { | |
e37c9e69 CM |
102 | break; |
103 | } | |
7d7d6068 | 104 | |
e37c9e69 CM |
105 | if (btrfs_key_type(&key) == BTRFS_EXTENT_ITEM_KEY) { |
106 | if (!found) { | |
7d7d6068 | 107 | last = first_free; |
e37c9e69 | 108 | found = 1; |
e37c9e69 | 109 | } |
f510cfec CM |
110 | if (key.objectid > last) { |
111 | hole_size = key.objectid - last; | |
112 | set_extent_dirty(free_space_cache, last, | |
113 | last + hole_size - 1, | |
114 | GFP_NOFS); | |
7d7d6068 Y |
115 | } |
116 | last = key.objectid + key.offset; | |
e37c9e69 | 117 | } |
7d7d6068 | 118 | next: |
e37c9e69 CM |
119 | path->slots[0]++; |
120 | } | |
121 | ||
7d7d6068 Y |
122 | if (!found) |
123 | last = first_free; | |
124 | if (block_group->key.objectid + | |
125 | block_group->key.offset > last) { | |
126 | hole_size = block_group->key.objectid + | |
127 | block_group->key.offset - last; | |
f510cfec CM |
128 | set_extent_dirty(free_space_cache, last, |
129 | last + hole_size - 1, GFP_NOFS); | |
7d7d6068 | 130 | } |
e37c9e69 | 131 | block_group->cached = 1; |
54aa1f4d | 132 | err: |
e37c9e69 CM |
133 | btrfs_free_path(path); |
134 | return 0; | |
135 | } | |
136 | ||
5276aeda CM |
137 | struct btrfs_block_group_cache *btrfs_lookup_block_group(struct |
138 | btrfs_fs_info *info, | |
db94535d | 139 | u64 bytenr) |
be744175 | 140 | { |
96b5179d CM |
141 | struct extent_map_tree *block_group_cache; |
142 | struct btrfs_block_group_cache *block_group = NULL; | |
143 | u64 ptr; | |
144 | u64 start; | |
145 | u64 end; | |
be744175 CM |
146 | int ret; |
147 | ||
96b5179d CM |
148 | block_group_cache = &info->block_group_cache; |
149 | ret = find_first_extent_bit(block_group_cache, | |
db94535d | 150 | bytenr, &start, &end, |
96b5179d | 151 | BLOCK_GROUP_DATA | BLOCK_GROUP_METADATA); |
be744175 | 152 | if (ret) { |
96b5179d | 153 | return NULL; |
be744175 | 154 | } |
96b5179d CM |
155 | ret = get_state_private(block_group_cache, start, &ptr); |
156 | if (ret) | |
157 | return NULL; | |
158 | ||
ae2f5411 | 159 | block_group = (struct btrfs_block_group_cache *)(unsigned long)ptr; |
5cf66426 | 160 | if (block_group->key.objectid <= bytenr && bytenr < |
96b5179d CM |
161 | block_group->key.objectid + block_group->key.offset) |
162 | return block_group; | |
be744175 CM |
163 | return NULL; |
164 | } | |
e37c9e69 CM |
165 | static u64 find_search_start(struct btrfs_root *root, |
166 | struct btrfs_block_group_cache **cache_ret, | |
5e5745dc Y |
167 | u64 search_start, int num, |
168 | int data, int full_scan) | |
e37c9e69 | 169 | { |
e37c9e69 CM |
170 | int ret; |
171 | struct btrfs_block_group_cache *cache = *cache_ret; | |
e19caa5f | 172 | u64 last; |
f510cfec CM |
173 | u64 start = 0; |
174 | u64 end = 0; | |
257d0ce3 | 175 | u64 cache_miss = 0; |
f84a8b36 | 176 | int wrapped = 0; |
e37c9e69 | 177 | |
00f5c795 | 178 | if (!cache) { |
1a2b2ac7 | 179 | goto out; |
00f5c795 | 180 | } |
e37c9e69 | 181 | again: |
54aa1f4d CM |
182 | ret = cache_block_group(root, cache); |
183 | if (ret) | |
184 | goto out; | |
f84a8b36 | 185 | |
e19caa5f CM |
186 | last = max(search_start, cache->key.objectid); |
187 | ||
e37c9e69 | 188 | while(1) { |
f510cfec CM |
189 | ret = find_first_extent_bit(&root->fs_info->free_space_cache, |
190 | last, &start, &end, EXTENT_DIRTY); | |
e19caa5f | 191 | if (ret) { |
257d0ce3 CM |
192 | if (!cache_miss) |
193 | cache_miss = last; | |
e19caa5f CM |
194 | goto new_group; |
195 | } | |
f510cfec CM |
196 | |
197 | start = max(last, start); | |
198 | last = end + 1; | |
257d0ce3 CM |
199 | if (last - start < num) { |
200 | if (last == cache->key.objectid + cache->key.offset) | |
201 | cache_miss = start; | |
f510cfec | 202 | continue; |
257d0ce3 CM |
203 | } |
204 | if (data != BTRFS_BLOCK_GROUP_MIXED && | |
5cf66426 | 205 | start + num > cache->key.objectid + cache->key.offset) |
e37c9e69 | 206 | goto new_group; |
f510cfec | 207 | return start; |
e37c9e69 CM |
208 | } |
209 | out: | |
1a2b2ac7 CM |
210 | cache = btrfs_lookup_block_group(root->fs_info, search_start); |
211 | if (!cache) { | |
212 | printk("Unable to find block group for %Lu\n", | |
213 | search_start); | |
214 | WARN_ON(1); | |
215 | return search_start; | |
216 | } | |
1a5bc167 | 217 | return search_start; |
e37c9e69 CM |
218 | |
219 | new_group: | |
e19caa5f | 220 | last = cache->key.objectid + cache->key.offset; |
f84a8b36 | 221 | wrapped: |
e19caa5f | 222 | cache = btrfs_lookup_block_group(root->fs_info, last); |
e37c9e69 | 223 | if (!cache) { |
0e4de584 | 224 | no_cache: |
f84a8b36 CM |
225 | if (!wrapped) { |
226 | wrapped = 1; | |
227 | last = search_start; | |
228 | data = BTRFS_BLOCK_GROUP_MIXED; | |
229 | goto wrapped; | |
230 | } | |
1a2b2ac7 | 231 | goto out; |
e37c9e69 | 232 | } |
257d0ce3 CM |
233 | if (cache_miss && !cache->cached) { |
234 | cache_block_group(root, cache); | |
235 | last = cache_miss; | |
257d0ce3 CM |
236 | cache = btrfs_lookup_block_group(root->fs_info, last); |
237 | } | |
1a2b2ac7 | 238 | cache = btrfs_find_block_group(root, cache, last, data, 0); |
0e4de584 CM |
239 | if (!cache) |
240 | goto no_cache; | |
e37c9e69 | 241 | *cache_ret = cache; |
257d0ce3 | 242 | cache_miss = 0; |
e37c9e69 CM |
243 | goto again; |
244 | } | |
245 | ||
84f54cfa CM |
246 | static u64 div_factor(u64 num, int factor) |
247 | { | |
257d0ce3 CM |
248 | if (factor == 10) |
249 | return num; | |
84f54cfa CM |
250 | num *= factor; |
251 | do_div(num, 10); | |
252 | return num; | |
253 | } | |
254 | ||
31f3c99b CM |
255 | struct btrfs_block_group_cache *btrfs_find_block_group(struct btrfs_root *root, |
256 | struct btrfs_block_group_cache | |
be744175 | 257 | *hint, u64 search_start, |
de428b63 | 258 | int data, int owner) |
cd1bc465 | 259 | { |
96b5179d CM |
260 | struct btrfs_block_group_cache *cache; |
261 | struct extent_map_tree *block_group_cache; | |
31f3c99b | 262 | struct btrfs_block_group_cache *found_group = NULL; |
cd1bc465 CM |
263 | struct btrfs_fs_info *info = root->fs_info; |
264 | u64 used; | |
31f3c99b CM |
265 | u64 last = 0; |
266 | u64 hint_last; | |
96b5179d CM |
267 | u64 start; |
268 | u64 end; | |
269 | u64 free_check; | |
270 | u64 ptr; | |
271 | int bit; | |
cd1bc465 | 272 | int ret; |
31f3c99b | 273 | int full_search = 0; |
de428b63 | 274 | int factor = 8; |
1e2677e0 | 275 | int data_swap = 0; |
de428b63 | 276 | |
96b5179d CM |
277 | block_group_cache = &info->block_group_cache; |
278 | ||
de428b63 | 279 | if (!owner) |
f84a8b36 | 280 | factor = 8; |
be744175 | 281 | |
257d0ce3 | 282 | if (data == BTRFS_BLOCK_GROUP_MIXED) { |
f84a8b36 | 283 | bit = BLOCK_GROUP_DATA | BLOCK_GROUP_METADATA; |
257d0ce3 CM |
284 | factor = 10; |
285 | } else if (data) | |
96b5179d CM |
286 | bit = BLOCK_GROUP_DATA; |
287 | else | |
288 | bit = BLOCK_GROUP_METADATA; | |
be744175 CM |
289 | |
290 | if (search_start) { | |
291 | struct btrfs_block_group_cache *shint; | |
5276aeda | 292 | shint = btrfs_lookup_block_group(info, search_start); |
f84a8b36 CM |
293 | if (shint && (shint->data == data || |
294 | shint->data == BTRFS_BLOCK_GROUP_MIXED)) { | |
be744175 | 295 | used = btrfs_block_group_used(&shint->item); |
324ae4df Y |
296 | if (used + shint->pinned < |
297 | div_factor(shint->key.offset, factor)) { | |
be744175 CM |
298 | return shint; |
299 | } | |
300 | } | |
301 | } | |
f84a8b36 CM |
302 | if (hint && (hint->data == data || |
303 | hint->data == BTRFS_BLOCK_GROUP_MIXED)) { | |
31f3c99b | 304 | used = btrfs_block_group_used(&hint->item); |
324ae4df Y |
305 | if (used + hint->pinned < |
306 | div_factor(hint->key.offset, factor)) { | |
31f3c99b CM |
307 | return hint; |
308 | } | |
e19caa5f | 309 | last = hint->key.objectid + hint->key.offset; |
31f3c99b CM |
310 | hint_last = last; |
311 | } else { | |
e37c9e69 CM |
312 | if (hint) |
313 | hint_last = max(hint->key.objectid, search_start); | |
314 | else | |
315 | hint_last = search_start; | |
316 | ||
317 | last = hint_last; | |
31f3c99b | 318 | } |
31f3c99b | 319 | again: |
cd1bc465 | 320 | while(1) { |
96b5179d CM |
321 | ret = find_first_extent_bit(block_group_cache, last, |
322 | &start, &end, bit); | |
323 | if (ret) | |
cd1bc465 | 324 | break; |
96b5179d CM |
325 | |
326 | ret = get_state_private(block_group_cache, start, &ptr); | |
327 | if (ret) | |
328 | break; | |
329 | ||
ae2f5411 | 330 | cache = (struct btrfs_block_group_cache *)(unsigned long)ptr; |
96b5179d CM |
331 | last = cache->key.objectid + cache->key.offset; |
332 | used = btrfs_block_group_used(&cache->item); | |
333 | ||
334 | if (full_search) | |
335 | free_check = cache->key.offset; | |
336 | else | |
337 | free_check = div_factor(cache->key.offset, factor); | |
324ae4df | 338 | if (used + cache->pinned < free_check) { |
96b5179d CM |
339 | found_group = cache; |
340 | goto found; | |
cd1bc465 | 341 | } |
de428b63 | 342 | cond_resched(); |
cd1bc465 | 343 | } |
31f3c99b | 344 | if (!full_search) { |
be744175 | 345 | last = search_start; |
31f3c99b CM |
346 | full_search = 1; |
347 | goto again; | |
348 | } | |
1e2677e0 | 349 | if (!data_swap) { |
1e2677e0 | 350 | data_swap = 1; |
96b5179d | 351 | bit = BLOCK_GROUP_DATA | BLOCK_GROUP_METADATA; |
1e2677e0 CM |
352 | last = search_start; |
353 | goto again; | |
354 | } | |
be744175 | 355 | found: |
31f3c99b | 356 | return found_group; |
cd1bc465 CM |
357 | } |
358 | ||
7bb86316 | 359 | static u64 hash_extent_ref(u64 root_objectid, u64 ref_generation, |
74493f7a CM |
360 | u64 owner, u64 owner_offset) |
361 | { | |
362 | u32 high_crc = ~(u32)0; | |
363 | u32 low_crc = ~(u32)0; | |
364 | __le64 lenum; | |
365 | ||
366 | lenum = cpu_to_le64(root_objectid); | |
367 | high_crc = crc32c(high_crc, &lenum, sizeof(lenum)); | |
7bb86316 CM |
368 | lenum = cpu_to_le64(ref_generation); |
369 | low_crc = crc32c(low_crc, &lenum, sizeof(lenum)); | |
74493f7a | 370 | |
7bb86316 | 371 | #if 0 |
74493f7a CM |
372 | lenum = cpu_to_le64(owner); |
373 | low_crc = crc32c(low_crc, &lenum, sizeof(lenum)); | |
74493f7a CM |
374 | lenum = cpu_to_le64(owner_offset); |
375 | low_crc = crc32c(low_crc, &lenum, sizeof(lenum)); | |
7bb86316 | 376 | #endif |
74493f7a CM |
377 | return ((u64)high_crc << 32) | (u64)low_crc; |
378 | } | |
379 | ||
7bb86316 CM |
380 | static int match_extent_ref(struct extent_buffer *leaf, |
381 | struct btrfs_extent_ref *disk_ref, | |
382 | struct btrfs_extent_ref *cpu_ref) | |
383 | { | |
384 | int ret; | |
385 | int len; | |
386 | ||
387 | if (cpu_ref->objectid) | |
388 | len = sizeof(*cpu_ref); | |
389 | else | |
390 | len = 2 * sizeof(u64); | |
391 | ret = memcmp_extent_buffer(leaf, cpu_ref, (unsigned long)disk_ref, | |
392 | len); | |
393 | return ret == 0; | |
394 | } | |
395 | ||
396 | static int lookup_extent_backref(struct btrfs_trans_handle *trans, | |
397 | struct btrfs_root *root, | |
398 | struct btrfs_path *path, u64 bytenr, | |
399 | u64 root_objectid, u64 ref_generation, | |
400 | u64 owner, u64 owner_offset, int del) | |
74493f7a CM |
401 | { |
402 | u64 hash; | |
403 | struct btrfs_key key; | |
7bb86316 | 404 | struct btrfs_key found_key; |
74493f7a | 405 | struct btrfs_extent_ref ref; |
7bb86316 CM |
406 | struct extent_buffer *leaf; |
407 | struct btrfs_extent_ref *disk_ref; | |
408 | int ret; | |
409 | int ret2; | |
410 | ||
411 | btrfs_set_stack_ref_root(&ref, root_objectid); | |
412 | btrfs_set_stack_ref_generation(&ref, ref_generation); | |
413 | btrfs_set_stack_ref_objectid(&ref, owner); | |
414 | btrfs_set_stack_ref_offset(&ref, owner_offset); | |
415 | ||
416 | hash = hash_extent_ref(root_objectid, ref_generation, owner, | |
417 | owner_offset); | |
418 | key.offset = hash; | |
419 | key.objectid = bytenr; | |
420 | key.type = BTRFS_EXTENT_REF_KEY; | |
421 | ||
422 | while (1) { | |
423 | ret = btrfs_search_slot(trans, root, &key, path, | |
424 | del ? -1 : 0, del); | |
425 | if (ret < 0) | |
426 | goto out; | |
427 | leaf = path->nodes[0]; | |
428 | if (ret != 0) { | |
429 | u32 nritems = btrfs_header_nritems(leaf); | |
430 | if (path->slots[0] >= nritems) { | |
431 | ret2 = btrfs_next_leaf(root, path); | |
432 | if (ret2) | |
433 | goto out; | |
434 | leaf = path->nodes[0]; | |
435 | } | |
436 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); | |
437 | if (found_key.objectid != bytenr || | |
438 | found_key.type != BTRFS_EXTENT_REF_KEY) | |
439 | goto out; | |
440 | key.offset = found_key.offset; | |
441 | if (del) { | |
442 | btrfs_release_path(root, path); | |
443 | continue; | |
444 | } | |
445 | } | |
446 | disk_ref = btrfs_item_ptr(path->nodes[0], | |
447 | path->slots[0], | |
448 | struct btrfs_extent_ref); | |
449 | if (match_extent_ref(path->nodes[0], disk_ref, &ref)) { | |
450 | ret = 0; | |
451 | goto out; | |
452 | } | |
453 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); | |
454 | key.offset = found_key.offset + 1; | |
455 | btrfs_release_path(root, path); | |
456 | } | |
457 | out: | |
458 | return ret; | |
459 | } | |
460 | ||
d8d5f3e1 CM |
461 | /* |
462 | * Back reference rules. Back refs have three main goals: | |
463 | * | |
464 | * 1) differentiate between all holders of references to an extent so that | |
465 | * when a reference is dropped we can make sure it was a valid reference | |
466 | * before freeing the extent. | |
467 | * | |
468 | * 2) Provide enough information to quickly find the holders of an extent | |
469 | * if we notice a given block is corrupted or bad. | |
470 | * | |
471 | * 3) Make it easy to migrate blocks for FS shrinking or storage pool | |
472 | * maintenance. This is actually the same as #2, but with a slightly | |
473 | * different use case. | |
474 | * | |
475 | * File extents can be referenced by: | |
476 | * | |
477 | * - multiple snapshots, subvolumes, or different generations in one subvol | |
478 | * - different files inside a single subvolume (in theory, not implemented yet) | |
479 | * - different offsets inside a file (bookend extents in file.c) | |
480 | * | |
481 | * The extent ref structure has fields for: | |
482 | * | |
483 | * - Objectid of the subvolume root | |
484 | * - Generation number of the tree holding the reference | |
485 | * - objectid of the file holding the reference | |
486 | * - offset in the file corresponding to the key holding the reference | |
487 | * | |
488 | * When a file extent is allocated the fields are filled in: | |
489 | * (root_key.objectid, trans->transid, inode objectid, offset in file) | |
490 | * | |
491 | * When a leaf is cow'd new references are added for every file extent found | |
492 | * in the leaf. It looks the same as the create case, but trans->transid | |
493 | * will be different when the block is cow'd. | |
494 | * | |
495 | * (root_key.objectid, trans->transid, inode objectid, offset in file) | |
496 | * | |
497 | * When a file extent is removed either during snapshot deletion or file | |
498 | * truncation, the corresponding back reference is found | |
499 | * by searching for: | |
500 | * | |
501 | * (btrfs_header_owner(leaf), btrfs_header_generation(leaf), | |
502 | * inode objectid, offset in file) | |
503 | * | |
504 | * Btree extents can be referenced by: | |
505 | * | |
506 | * - Different subvolumes | |
507 | * - Different generations of the same subvolume | |
508 | * | |
509 | * Storing sufficient information for a full reverse mapping of a btree | |
510 | * block would require storing the lowest key of the block in the backref, | |
511 | * and it would require updating that lowest key either before write out or | |
512 | * every time it changed. Instead, the objectid of the lowest key is stored | |
513 | * along with the level of the tree block. This provides a hint | |
514 | * about where in the btree the block can be found. Searches through the | |
515 | * btree only need to look for a pointer to that block, so they stop one | |
516 | * level higher than the level recorded in the backref. | |
517 | * | |
518 | * Some btrees do not do reference counting on their extents. These | |
519 | * include the extent tree and the tree of tree roots. Backrefs for these | |
520 | * trees always have a generation of zero. | |
521 | * | |
522 | * When a tree block is created, back references are inserted: | |
523 | * | |
f6dbff55 | 524 | * (root->root_key.objectid, trans->transid or zero, level, lowest_key_objectid) |
d8d5f3e1 CM |
525 | * |
526 | * When a tree block is cow'd in a reference counted root, | |
527 | * new back references are added for all the blocks it points to. | |
528 | * These are of the form (trans->transid will have increased since creation): | |
529 | * | |
f6dbff55 | 530 | * (root->root_key.objectid, trans->transid, level, lowest_key_objectid) |
d8d5f3e1 CM |
531 | * |
532 | * Because the lowest_key_objectid and the level are just hints | |
533 | * they are not used when backrefs are deleted. When a backref is deleted: | |
534 | * | |
535 | * if backref was for a tree root: | |
536 | * root_objectid = root->root_key.objectid | |
537 | * else | |
538 | * root_objectid = btrfs_header_owner(parent) | |
539 | * | |
540 | * (root_objectid, btrfs_header_generation(parent) or zero, 0, 0) | |
541 | * | |
542 | * Back Reference Key hashing: | |
543 | * | |
544 | * Back references have four fields, each 64 bits long. Unfortunately, | |
545 | * This is hashed into a single 64 bit number and placed into the key offset. | |
546 | * The key objectid corresponds to the first byte in the extent, and the | |
547 | * key type is set to BTRFS_EXTENT_REF_KEY | |
548 | */ | |
7bb86316 CM |
549 | int btrfs_insert_extent_backref(struct btrfs_trans_handle *trans, |
550 | struct btrfs_root *root, | |
551 | struct btrfs_path *path, u64 bytenr, | |
552 | u64 root_objectid, u64 ref_generation, | |
553 | u64 owner, u64 owner_offset) | |
554 | { | |
555 | u64 hash; | |
556 | struct btrfs_key key; | |
557 | struct btrfs_extent_ref ref; | |
558 | struct btrfs_extent_ref *disk_ref; | |
74493f7a CM |
559 | int ret; |
560 | ||
561 | btrfs_set_stack_ref_root(&ref, root_objectid); | |
7bb86316 | 562 | btrfs_set_stack_ref_generation(&ref, ref_generation); |
74493f7a CM |
563 | btrfs_set_stack_ref_objectid(&ref, owner); |
564 | btrfs_set_stack_ref_offset(&ref, owner_offset); | |
565 | ||
7bb86316 CM |
566 | hash = hash_extent_ref(root_objectid, ref_generation, owner, |
567 | owner_offset); | |
74493f7a CM |
568 | key.offset = hash; |
569 | key.objectid = bytenr; | |
570 | key.type = BTRFS_EXTENT_REF_KEY; | |
571 | ||
572 | ret = btrfs_insert_empty_item(trans, root, path, &key, sizeof(ref)); | |
573 | while (ret == -EEXIST) { | |
7bb86316 CM |
574 | disk_ref = btrfs_item_ptr(path->nodes[0], path->slots[0], |
575 | struct btrfs_extent_ref); | |
576 | if (match_extent_ref(path->nodes[0], disk_ref, &ref)) | |
577 | goto out; | |
578 | key.offset++; | |
579 | btrfs_release_path(root, path); | |
580 | ret = btrfs_insert_empty_item(trans, root, path, &key, | |
581 | sizeof(ref)); | |
74493f7a | 582 | } |
7bb86316 CM |
583 | if (ret) |
584 | goto out; | |
585 | disk_ref = btrfs_item_ptr(path->nodes[0], path->slots[0], | |
586 | struct btrfs_extent_ref); | |
587 | write_extent_buffer(path->nodes[0], &ref, (unsigned long)disk_ref, | |
588 | sizeof(ref)); | |
589 | btrfs_mark_buffer_dirty(path->nodes[0]); | |
590 | out: | |
591 | btrfs_release_path(root, path); | |
592 | return ret; | |
74493f7a CM |
593 | } |
594 | ||
b18c6685 CM |
595 | int btrfs_inc_extent_ref(struct btrfs_trans_handle *trans, |
596 | struct btrfs_root *root, | |
74493f7a | 597 | u64 bytenr, u64 num_bytes, |
7bb86316 | 598 | u64 root_objectid, u64 ref_generation, |
74493f7a | 599 | u64 owner, u64 owner_offset) |
02217ed2 | 600 | { |
5caf2a00 | 601 | struct btrfs_path *path; |
02217ed2 | 602 | int ret; |
e2fa7227 | 603 | struct btrfs_key key; |
5f39d397 | 604 | struct extent_buffer *l; |
234b63a0 | 605 | struct btrfs_extent_item *item; |
cf27e1ee | 606 | u32 refs; |
037e6390 | 607 | |
db94535d | 608 | WARN_ON(num_bytes < root->sectorsize); |
5caf2a00 | 609 | path = btrfs_alloc_path(); |
54aa1f4d CM |
610 | if (!path) |
611 | return -ENOMEM; | |
26b8003f | 612 | |
db94535d | 613 | key.objectid = bytenr; |
62e2749e | 614 | btrfs_set_key_type(&key, BTRFS_EXTENT_ITEM_KEY); |
db94535d | 615 | key.offset = num_bytes; |
5caf2a00 | 616 | ret = btrfs_search_slot(trans, root->fs_info->extent_root, &key, path, |
9f5fae2f | 617 | 0, 1); |
54aa1f4d CM |
618 | if (ret < 0) |
619 | return ret; | |
a429e513 | 620 | if (ret != 0) { |
a28ec197 | 621 | BUG(); |
a429e513 | 622 | } |
02217ed2 | 623 | BUG_ON(ret != 0); |
5f39d397 | 624 | l = path->nodes[0]; |
5caf2a00 | 625 | item = btrfs_item_ptr(l, path->slots[0], struct btrfs_extent_item); |
5f39d397 CM |
626 | refs = btrfs_extent_refs(l, item); |
627 | btrfs_set_extent_refs(l, item, refs + 1); | |
5caf2a00 | 628 | btrfs_mark_buffer_dirty(path->nodes[0]); |
a28ec197 | 629 | |
5caf2a00 | 630 | btrfs_release_path(root->fs_info->extent_root, path); |
7bb86316 CM |
631 | |
632 | ret = btrfs_insert_extent_backref(trans, root->fs_info->extent_root, | |
633 | path, bytenr, root_objectid, | |
634 | ref_generation, owner, owner_offset); | |
635 | BUG_ON(ret); | |
9f5fae2f | 636 | finish_current_insert(trans, root->fs_info->extent_root); |
e20d96d6 | 637 | del_pending_extents(trans, root->fs_info->extent_root); |
74493f7a CM |
638 | |
639 | btrfs_free_path(path); | |
02217ed2 CM |
640 | return 0; |
641 | } | |
642 | ||
e9d0b13b CM |
643 | int btrfs_extent_post_op(struct btrfs_trans_handle *trans, |
644 | struct btrfs_root *root) | |
645 | { | |
646 | finish_current_insert(trans, root->fs_info->extent_root); | |
647 | del_pending_extents(trans, root->fs_info->extent_root); | |
648 | return 0; | |
649 | } | |
650 | ||
b18c6685 | 651 | static int lookup_extent_ref(struct btrfs_trans_handle *trans, |
db94535d CM |
652 | struct btrfs_root *root, u64 bytenr, |
653 | u64 num_bytes, u32 *refs) | |
a28ec197 | 654 | { |
5caf2a00 | 655 | struct btrfs_path *path; |
a28ec197 | 656 | int ret; |
e2fa7227 | 657 | struct btrfs_key key; |
5f39d397 | 658 | struct extent_buffer *l; |
234b63a0 | 659 | struct btrfs_extent_item *item; |
5caf2a00 | 660 | |
db94535d | 661 | WARN_ON(num_bytes < root->sectorsize); |
5caf2a00 | 662 | path = btrfs_alloc_path(); |
db94535d CM |
663 | key.objectid = bytenr; |
664 | key.offset = num_bytes; | |
62e2749e | 665 | btrfs_set_key_type(&key, BTRFS_EXTENT_ITEM_KEY); |
5caf2a00 | 666 | ret = btrfs_search_slot(trans, root->fs_info->extent_root, &key, path, |
9f5fae2f | 667 | 0, 0); |
54aa1f4d CM |
668 | if (ret < 0) |
669 | goto out; | |
5f39d397 CM |
670 | if (ret != 0) { |
671 | btrfs_print_leaf(root, path->nodes[0]); | |
db94535d | 672 | printk("failed to find block number %Lu\n", bytenr); |
a28ec197 | 673 | BUG(); |
5f39d397 CM |
674 | } |
675 | l = path->nodes[0]; | |
5caf2a00 | 676 | item = btrfs_item_ptr(l, path->slots[0], struct btrfs_extent_item); |
5f39d397 | 677 | *refs = btrfs_extent_refs(l, item); |
54aa1f4d | 678 | out: |
5caf2a00 | 679 | btrfs_free_path(path); |
a28ec197 CM |
680 | return 0; |
681 | } | |
682 | ||
be20aa9d CM |
683 | u32 btrfs_count_snapshots_in_path(struct btrfs_root *root, |
684 | struct btrfs_path *count_path, | |
685 | u64 first_extent) | |
686 | { | |
687 | struct btrfs_root *extent_root = root->fs_info->extent_root; | |
688 | struct btrfs_path *path; | |
689 | u64 bytenr; | |
690 | u64 found_objectid; | |
56b453c9 | 691 | u64 root_objectid = root->root_key.objectid; |
be20aa9d CM |
692 | u32 total_count = 0; |
693 | u32 cur_count; | |
694 | u32 refs; | |
695 | u32 nritems; | |
696 | int ret; | |
697 | struct btrfs_key key; | |
698 | struct btrfs_key found_key; | |
699 | struct extent_buffer *l; | |
700 | struct btrfs_extent_item *item; | |
701 | struct btrfs_extent_ref *ref_item; | |
702 | int level = -1; | |
703 | ||
704 | path = btrfs_alloc_path(); | |
705 | again: | |
706 | if (level == -1) | |
707 | bytenr = first_extent; | |
708 | else | |
709 | bytenr = count_path->nodes[level]->start; | |
710 | ||
711 | cur_count = 0; | |
712 | key.objectid = bytenr; | |
713 | key.offset = 0; | |
714 | ||
715 | btrfs_set_key_type(&key, BTRFS_EXTENT_ITEM_KEY); | |
716 | ret = btrfs_search_slot(NULL, extent_root, &key, path, 0, 0); | |
717 | if (ret < 0) | |
718 | goto out; | |
719 | BUG_ON(ret == 0); | |
720 | ||
721 | l = path->nodes[0]; | |
722 | btrfs_item_key_to_cpu(l, &found_key, path->slots[0]); | |
723 | ||
724 | if (found_key.objectid != bytenr || | |
725 | found_key.type != BTRFS_EXTENT_ITEM_KEY) { | |
726 | goto out; | |
727 | } | |
728 | ||
729 | item = btrfs_item_ptr(l, path->slots[0], struct btrfs_extent_item); | |
730 | refs = btrfs_extent_refs(l, item); | |
731 | while (1) { | |
732 | nritems = btrfs_header_nritems(l); | |
733 | if (path->slots[0] >= nritems) { | |
734 | ret = btrfs_next_leaf(extent_root, path); | |
735 | if (ret == 0) | |
736 | continue; | |
737 | break; | |
738 | } | |
739 | btrfs_item_key_to_cpu(l, &found_key, path->slots[0]); | |
740 | if (found_key.objectid != bytenr) | |
741 | break; | |
742 | if (found_key.type != BTRFS_EXTENT_REF_KEY) { | |
743 | path->slots[0]++; | |
744 | continue; | |
745 | } | |
746 | ||
747 | cur_count++; | |
748 | ref_item = btrfs_item_ptr(l, path->slots[0], | |
749 | struct btrfs_extent_ref); | |
750 | found_objectid = btrfs_ref_root(l, ref_item); | |
751 | ||
56b453c9 CM |
752 | if (found_objectid != root_objectid) { |
753 | total_count = 2; | |
4313b399 | 754 | goto out; |
56b453c9 CM |
755 | } |
756 | total_count = 1; | |
be20aa9d CM |
757 | path->slots[0]++; |
758 | } | |
759 | if (cur_count == 0) { | |
760 | total_count = 0; | |
761 | goto out; | |
762 | } | |
be20aa9d CM |
763 | if (level >= 0 && root->node == count_path->nodes[level]) |
764 | goto out; | |
765 | level++; | |
766 | btrfs_release_path(root, path); | |
767 | goto again; | |
768 | ||
769 | out: | |
770 | btrfs_free_path(path); | |
771 | return total_count; | |
772 | ||
773 | } | |
774 | ||
c5739bba | 775 | int btrfs_inc_root_ref(struct btrfs_trans_handle *trans, |
7bb86316 | 776 | struct btrfs_root *root, u64 owner_objectid) |
c5739bba | 777 | { |
7bb86316 CM |
778 | u64 generation; |
779 | u64 key_objectid; | |
780 | u64 level; | |
781 | u32 nritems; | |
782 | struct btrfs_disk_key disk_key; | |
783 | ||
784 | level = btrfs_header_level(root->node); | |
785 | generation = trans->transid; | |
786 | nritems = btrfs_header_nritems(root->node); | |
787 | if (nritems > 0) { | |
788 | if (level == 0) | |
789 | btrfs_item_key(root->node, &disk_key, 0); | |
790 | else | |
791 | btrfs_node_key(root->node, &disk_key, 0); | |
792 | key_objectid = btrfs_disk_key_objectid(&disk_key); | |
793 | } else { | |
794 | key_objectid = 0; | |
795 | } | |
db94535d | 796 | return btrfs_inc_extent_ref(trans, root, root->node->start, |
7bb86316 | 797 | root->node->len, owner_objectid, |
f6dbff55 | 798 | generation, level, key_objectid); |
c5739bba CM |
799 | } |
800 | ||
e089f05c | 801 | int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root, |
5f39d397 | 802 | struct extent_buffer *buf) |
02217ed2 | 803 | { |
db94535d | 804 | u64 bytenr; |
5f39d397 CM |
805 | u32 nritems; |
806 | struct btrfs_key key; | |
6407bf6d | 807 | struct btrfs_file_extent_item *fi; |
02217ed2 | 808 | int i; |
db94535d | 809 | int level; |
6407bf6d | 810 | int ret; |
54aa1f4d | 811 | int faili; |
a28ec197 | 812 | |
3768f368 | 813 | if (!root->ref_cows) |
a28ec197 | 814 | return 0; |
5f39d397 | 815 | |
db94535d | 816 | level = btrfs_header_level(buf); |
5f39d397 CM |
817 | nritems = btrfs_header_nritems(buf); |
818 | for (i = 0; i < nritems; i++) { | |
db94535d CM |
819 | if (level == 0) { |
820 | u64 disk_bytenr; | |
5f39d397 CM |
821 | btrfs_item_key_to_cpu(buf, &key, i); |
822 | if (btrfs_key_type(&key) != BTRFS_EXTENT_DATA_KEY) | |
6407bf6d | 823 | continue; |
5f39d397 | 824 | fi = btrfs_item_ptr(buf, i, |
6407bf6d | 825 | struct btrfs_file_extent_item); |
5f39d397 | 826 | if (btrfs_file_extent_type(buf, fi) == |
236454df CM |
827 | BTRFS_FILE_EXTENT_INLINE) |
828 | continue; | |
db94535d CM |
829 | disk_bytenr = btrfs_file_extent_disk_bytenr(buf, fi); |
830 | if (disk_bytenr == 0) | |
3a686375 | 831 | continue; |
db94535d | 832 | ret = btrfs_inc_extent_ref(trans, root, disk_bytenr, |
7bb86316 CM |
833 | btrfs_file_extent_disk_num_bytes(buf, fi), |
834 | root->root_key.objectid, trans->transid, | |
835 | key.objectid, key.offset); | |
54aa1f4d CM |
836 | if (ret) { |
837 | faili = i; | |
838 | goto fail; | |
839 | } | |
6407bf6d | 840 | } else { |
db94535d | 841 | bytenr = btrfs_node_blockptr(buf, i); |
6caab489 | 842 | btrfs_node_key_to_cpu(buf, &key, i); |
db94535d | 843 | ret = btrfs_inc_extent_ref(trans, root, bytenr, |
7bb86316 CM |
844 | btrfs_level_size(root, level - 1), |
845 | root->root_key.objectid, | |
f6dbff55 CM |
846 | trans->transid, |
847 | level - 1, key.objectid); | |
54aa1f4d CM |
848 | if (ret) { |
849 | faili = i; | |
850 | goto fail; | |
851 | } | |
6407bf6d | 852 | } |
02217ed2 CM |
853 | } |
854 | return 0; | |
54aa1f4d | 855 | fail: |
ccd467d6 | 856 | WARN_ON(1); |
7bb86316 | 857 | #if 0 |
54aa1f4d | 858 | for (i =0; i < faili; i++) { |
db94535d CM |
859 | if (level == 0) { |
860 | u64 disk_bytenr; | |
5f39d397 CM |
861 | btrfs_item_key_to_cpu(buf, &key, i); |
862 | if (btrfs_key_type(&key) != BTRFS_EXTENT_DATA_KEY) | |
54aa1f4d | 863 | continue; |
5f39d397 | 864 | fi = btrfs_item_ptr(buf, i, |
54aa1f4d | 865 | struct btrfs_file_extent_item); |
5f39d397 | 866 | if (btrfs_file_extent_type(buf, fi) == |
54aa1f4d CM |
867 | BTRFS_FILE_EXTENT_INLINE) |
868 | continue; | |
db94535d CM |
869 | disk_bytenr = btrfs_file_extent_disk_bytenr(buf, fi); |
870 | if (disk_bytenr == 0) | |
54aa1f4d | 871 | continue; |
db94535d CM |
872 | err = btrfs_free_extent(trans, root, disk_bytenr, |
873 | btrfs_file_extent_disk_num_bytes(buf, | |
5f39d397 | 874 | fi), 0); |
54aa1f4d CM |
875 | BUG_ON(err); |
876 | } else { | |
db94535d CM |
877 | bytenr = btrfs_node_blockptr(buf, i); |
878 | err = btrfs_free_extent(trans, root, bytenr, | |
879 | btrfs_level_size(root, level - 1), 0); | |
54aa1f4d CM |
880 | BUG_ON(err); |
881 | } | |
882 | } | |
7bb86316 | 883 | #endif |
54aa1f4d | 884 | return ret; |
02217ed2 CM |
885 | } |
886 | ||
9078a3e1 CM |
887 | static int write_one_cache_group(struct btrfs_trans_handle *trans, |
888 | struct btrfs_root *root, | |
889 | struct btrfs_path *path, | |
890 | struct btrfs_block_group_cache *cache) | |
891 | { | |
892 | int ret; | |
893 | int pending_ret; | |
894 | struct btrfs_root *extent_root = root->fs_info->extent_root; | |
5f39d397 CM |
895 | unsigned long bi; |
896 | struct extent_buffer *leaf; | |
9078a3e1 | 897 | |
9078a3e1 | 898 | ret = btrfs_search_slot(trans, extent_root, &cache->key, path, 0, 1); |
54aa1f4d CM |
899 | if (ret < 0) |
900 | goto fail; | |
9078a3e1 | 901 | BUG_ON(ret); |
5f39d397 CM |
902 | |
903 | leaf = path->nodes[0]; | |
904 | bi = btrfs_item_ptr_offset(leaf, path->slots[0]); | |
905 | write_extent_buffer(leaf, &cache->item, bi, sizeof(cache->item)); | |
906 | btrfs_mark_buffer_dirty(leaf); | |
9078a3e1 | 907 | btrfs_release_path(extent_root, path); |
54aa1f4d | 908 | fail: |
9078a3e1 CM |
909 | finish_current_insert(trans, extent_root); |
910 | pending_ret = del_pending_extents(trans, extent_root); | |
911 | if (ret) | |
912 | return ret; | |
913 | if (pending_ret) | |
914 | return pending_ret; | |
915 | return 0; | |
916 | ||
917 | } | |
918 | ||
96b5179d CM |
919 | int btrfs_write_dirty_block_groups(struct btrfs_trans_handle *trans, |
920 | struct btrfs_root *root) | |
9078a3e1 | 921 | { |
96b5179d CM |
922 | struct extent_map_tree *block_group_cache; |
923 | struct btrfs_block_group_cache *cache; | |
9078a3e1 CM |
924 | int ret; |
925 | int err = 0; | |
926 | int werr = 0; | |
9078a3e1 | 927 | struct btrfs_path *path; |
96b5179d CM |
928 | u64 last = 0; |
929 | u64 start; | |
930 | u64 end; | |
931 | u64 ptr; | |
9078a3e1 | 932 | |
96b5179d | 933 | block_group_cache = &root->fs_info->block_group_cache; |
9078a3e1 CM |
934 | path = btrfs_alloc_path(); |
935 | if (!path) | |
936 | return -ENOMEM; | |
937 | ||
938 | while(1) { | |
96b5179d CM |
939 | ret = find_first_extent_bit(block_group_cache, last, |
940 | &start, &end, BLOCK_GROUP_DIRTY); | |
941 | if (ret) | |
9078a3e1 | 942 | break; |
54aa1f4d | 943 | |
96b5179d CM |
944 | last = end + 1; |
945 | ret = get_state_private(block_group_cache, start, &ptr); | |
946 | if (ret) | |
947 | break; | |
948 | ||
ae2f5411 | 949 | cache = (struct btrfs_block_group_cache *)(unsigned long)ptr; |
96b5179d CM |
950 | err = write_one_cache_group(trans, root, |
951 | path, cache); | |
952 | /* | |
953 | * if we fail to write the cache group, we want | |
954 | * to keep it marked dirty in hopes that a later | |
955 | * write will work | |
956 | */ | |
957 | if (err) { | |
958 | werr = err; | |
959 | continue; | |
9078a3e1 | 960 | } |
96b5179d CM |
961 | clear_extent_bits(block_group_cache, start, end, |
962 | BLOCK_GROUP_DIRTY, GFP_NOFS); | |
9078a3e1 CM |
963 | } |
964 | btrfs_free_path(path); | |
965 | return werr; | |
966 | } | |
967 | ||
968 | static int update_block_group(struct btrfs_trans_handle *trans, | |
969 | struct btrfs_root *root, | |
db94535d CM |
970 | u64 bytenr, u64 num_bytes, int alloc, |
971 | int mark_free, int data) | |
9078a3e1 CM |
972 | { |
973 | struct btrfs_block_group_cache *cache; | |
974 | struct btrfs_fs_info *info = root->fs_info; | |
db94535d | 975 | u64 total = num_bytes; |
9078a3e1 | 976 | u64 old_val; |
db94535d | 977 | u64 byte_in_group; |
96b5179d CM |
978 | u64 start; |
979 | u64 end; | |
3e1ad54f | 980 | |
9078a3e1 | 981 | while(total) { |
db94535d | 982 | cache = btrfs_lookup_block_group(info, bytenr); |
3e1ad54f | 983 | if (!cache) { |
9078a3e1 | 984 | return -1; |
cd1bc465 | 985 | } |
db94535d CM |
986 | byte_in_group = bytenr - cache->key.objectid; |
987 | WARN_ON(byte_in_group > cache->key.offset); | |
96b5179d CM |
988 | start = cache->key.objectid; |
989 | end = start + cache->key.offset - 1; | |
990 | set_extent_bits(&info->block_group_cache, start, end, | |
991 | BLOCK_GROUP_DIRTY, GFP_NOFS); | |
9078a3e1 CM |
992 | |
993 | old_val = btrfs_block_group_used(&cache->item); | |
db94535d | 994 | num_bytes = min(total, cache->key.offset - byte_in_group); |
cd1bc465 | 995 | if (alloc) { |
1e2677e0 | 996 | if (cache->data != data && |
84f54cfa | 997 | old_val < (cache->key.offset >> 1)) { |
96b5179d CM |
998 | int bit_to_clear; |
999 | int bit_to_set; | |
96b5179d | 1000 | cache->data = data; |
1e2677e0 | 1001 | if (data) { |
b97f9203 Y |
1002 | bit_to_clear = BLOCK_GROUP_METADATA; |
1003 | bit_to_set = BLOCK_GROUP_DATA; | |
f84a8b36 CM |
1004 | cache->item.flags &= |
1005 | ~BTRFS_BLOCK_GROUP_MIXED; | |
1e2677e0 CM |
1006 | cache->item.flags |= |
1007 | BTRFS_BLOCK_GROUP_DATA; | |
1008 | } else { | |
b97f9203 Y |
1009 | bit_to_clear = BLOCK_GROUP_DATA; |
1010 | bit_to_set = BLOCK_GROUP_METADATA; | |
f84a8b36 CM |
1011 | cache->item.flags &= |
1012 | ~BTRFS_BLOCK_GROUP_MIXED; | |
1e2677e0 CM |
1013 | cache->item.flags &= |
1014 | ~BTRFS_BLOCK_GROUP_DATA; | |
1015 | } | |
96b5179d CM |
1016 | clear_extent_bits(&info->block_group_cache, |
1017 | start, end, bit_to_clear, | |
1018 | GFP_NOFS); | |
1019 | set_extent_bits(&info->block_group_cache, | |
1020 | start, end, bit_to_set, | |
1021 | GFP_NOFS); | |
f84a8b36 CM |
1022 | } else if (cache->data != data && |
1023 | cache->data != BTRFS_BLOCK_GROUP_MIXED) { | |
1024 | cache->data = BTRFS_BLOCK_GROUP_MIXED; | |
1025 | set_extent_bits(&info->block_group_cache, | |
1026 | start, end, | |
1027 | BLOCK_GROUP_DATA | | |
1028 | BLOCK_GROUP_METADATA, | |
1029 | GFP_NOFS); | |
1e2677e0 | 1030 | } |
db94535d | 1031 | old_val += num_bytes; |
cd1bc465 | 1032 | } else { |
db94535d | 1033 | old_val -= num_bytes; |
f510cfec CM |
1034 | if (mark_free) { |
1035 | set_extent_dirty(&info->free_space_cache, | |
db94535d | 1036 | bytenr, bytenr + num_bytes - 1, |
f510cfec | 1037 | GFP_NOFS); |
e37c9e69 | 1038 | } |
cd1bc465 | 1039 | } |
9078a3e1 | 1040 | btrfs_set_block_group_used(&cache->item, old_val); |
db94535d CM |
1041 | total -= num_bytes; |
1042 | bytenr += num_bytes; | |
9078a3e1 CM |
1043 | } |
1044 | return 0; | |
1045 | } | |
324ae4df Y |
1046 | static int update_pinned_extents(struct btrfs_root *root, |
1047 | u64 bytenr, u64 num, int pin) | |
1048 | { | |
1049 | u64 len; | |
1050 | struct btrfs_block_group_cache *cache; | |
1051 | struct btrfs_fs_info *fs_info = root->fs_info; | |
1052 | ||
1053 | if (pin) { | |
1054 | set_extent_dirty(&fs_info->pinned_extents, | |
1055 | bytenr, bytenr + num - 1, GFP_NOFS); | |
1056 | } else { | |
1057 | clear_extent_dirty(&fs_info->pinned_extents, | |
1058 | bytenr, bytenr + num - 1, GFP_NOFS); | |
1059 | } | |
1060 | while (num > 0) { | |
1061 | cache = btrfs_lookup_block_group(fs_info, bytenr); | |
1062 | WARN_ON(!cache); | |
1063 | len = min(num, cache->key.offset - | |
1064 | (bytenr - cache->key.objectid)); | |
1065 | if (pin) { | |
1066 | cache->pinned += len; | |
1067 | fs_info->total_pinned += len; | |
1068 | } else { | |
1069 | cache->pinned -= len; | |
1070 | fs_info->total_pinned -= len; | |
1071 | } | |
1072 | bytenr += len; | |
1073 | num -= len; | |
1074 | } | |
1075 | return 0; | |
1076 | } | |
9078a3e1 | 1077 | |
1a5bc167 | 1078 | int btrfs_copy_pinned(struct btrfs_root *root, struct extent_map_tree *copy) |
ccd467d6 | 1079 | { |
ccd467d6 | 1080 | u64 last = 0; |
1a5bc167 CM |
1081 | u64 start; |
1082 | u64 end; | |
1083 | struct extent_map_tree *pinned_extents = &root->fs_info->pinned_extents; | |
ccd467d6 | 1084 | int ret; |
ccd467d6 CM |
1085 | |
1086 | while(1) { | |
1a5bc167 CM |
1087 | ret = find_first_extent_bit(pinned_extents, last, |
1088 | &start, &end, EXTENT_DIRTY); | |
1089 | if (ret) | |
ccd467d6 | 1090 | break; |
1a5bc167 CM |
1091 | set_extent_dirty(copy, start, end, GFP_NOFS); |
1092 | last = end + 1; | |
ccd467d6 CM |
1093 | } |
1094 | return 0; | |
1095 | } | |
1096 | ||
1097 | int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans, | |
1098 | struct btrfs_root *root, | |
1a5bc167 | 1099 | struct extent_map_tree *unpin) |
a28ec197 | 1100 | { |
1a5bc167 CM |
1101 | u64 start; |
1102 | u64 end; | |
a28ec197 | 1103 | int ret; |
f510cfec | 1104 | struct extent_map_tree *free_space_cache; |
f510cfec | 1105 | free_space_cache = &root->fs_info->free_space_cache; |
a28ec197 CM |
1106 | |
1107 | while(1) { | |
1a5bc167 CM |
1108 | ret = find_first_extent_bit(unpin, 0, &start, &end, |
1109 | EXTENT_DIRTY); | |
1110 | if (ret) | |
a28ec197 | 1111 | break; |
324ae4df | 1112 | update_pinned_extents(root, start, end + 1 - start, 0); |
1a5bc167 CM |
1113 | clear_extent_dirty(unpin, start, end, GFP_NOFS); |
1114 | set_extent_dirty(free_space_cache, start, end, GFP_NOFS); | |
a28ec197 CM |
1115 | } |
1116 | return 0; | |
1117 | } | |
1118 | ||
e089f05c CM |
1119 | static int finish_current_insert(struct btrfs_trans_handle *trans, struct |
1120 | btrfs_root *extent_root) | |
037e6390 | 1121 | { |
7bb86316 CM |
1122 | u64 start; |
1123 | u64 end; | |
1124 | struct btrfs_fs_info *info = extent_root->fs_info; | |
d8d5f3e1 | 1125 | struct extent_buffer *eb; |
7bb86316 | 1126 | struct btrfs_path *path; |
e2fa7227 | 1127 | struct btrfs_key ins; |
d8d5f3e1 | 1128 | struct btrfs_disk_key first; |
234b63a0 | 1129 | struct btrfs_extent_item extent_item; |
037e6390 | 1130 | int ret; |
d8d5f3e1 | 1131 | int level; |
1a5bc167 | 1132 | int err = 0; |
037e6390 | 1133 | |
5f39d397 | 1134 | btrfs_set_stack_extent_refs(&extent_item, 1); |
62e2749e | 1135 | btrfs_set_key_type(&ins, BTRFS_EXTENT_ITEM_KEY); |
7bb86316 | 1136 | path = btrfs_alloc_path(); |
037e6390 | 1137 | |
26b8003f | 1138 | while(1) { |
1a5bc167 CM |
1139 | ret = find_first_extent_bit(&info->extent_ins, 0, &start, |
1140 | &end, EXTENT_LOCKED); | |
1141 | if (ret) | |
26b8003f CM |
1142 | break; |
1143 | ||
1a5bc167 CM |
1144 | ins.objectid = start; |
1145 | ins.offset = end + 1 - start; | |
1146 | err = btrfs_insert_item(trans, extent_root, &ins, | |
1147 | &extent_item, sizeof(extent_item)); | |
1148 | clear_extent_bits(&info->extent_ins, start, end, EXTENT_LOCKED, | |
1149 | GFP_NOFS); | |
d8d5f3e1 CM |
1150 | eb = read_tree_block(extent_root, ins.objectid, ins.offset); |
1151 | level = btrfs_header_level(eb); | |
1152 | if (level == 0) { | |
1153 | btrfs_item_key(eb, &first, 0); | |
1154 | } else { | |
1155 | btrfs_node_key(eb, &first, 0); | |
1156 | } | |
7bb86316 CM |
1157 | err = btrfs_insert_extent_backref(trans, extent_root, path, |
1158 | start, extent_root->root_key.objectid, | |
f6dbff55 CM |
1159 | 0, level, |
1160 | btrfs_disk_key_objectid(&first)); | |
7bb86316 | 1161 | BUG_ON(err); |
d8d5f3e1 | 1162 | free_extent_buffer(eb); |
037e6390 | 1163 | } |
7bb86316 | 1164 | btrfs_free_path(path); |
037e6390 CM |
1165 | return 0; |
1166 | } | |
1167 | ||
db94535d CM |
1168 | static int pin_down_bytes(struct btrfs_root *root, u64 bytenr, u32 num_bytes, |
1169 | int pending) | |
e20d96d6 | 1170 | { |
1a5bc167 | 1171 | int err = 0; |
5f39d397 | 1172 | struct extent_buffer *buf; |
8ef97622 | 1173 | |
f4b9aa8d | 1174 | if (!pending) { |
db94535d | 1175 | buf = btrfs_find_tree_block(root, bytenr, num_bytes); |
5f39d397 CM |
1176 | if (buf) { |
1177 | if (btrfs_buffer_uptodate(buf)) { | |
2c90e5d6 CM |
1178 | u64 transid = |
1179 | root->fs_info->running_transaction->transid; | |
5f39d397 CM |
1180 | if (btrfs_header_generation(buf) == transid) { |
1181 | free_extent_buffer(buf); | |
c549228f | 1182 | return 1; |
2c90e5d6 | 1183 | } |
f4b9aa8d | 1184 | } |
5f39d397 | 1185 | free_extent_buffer(buf); |
8ef97622 | 1186 | } |
324ae4df | 1187 | update_pinned_extents(root, bytenr, num_bytes, 1); |
f4b9aa8d | 1188 | } else { |
1a5bc167 | 1189 | set_extent_bits(&root->fs_info->pending_del, |
db94535d CM |
1190 | bytenr, bytenr + num_bytes - 1, |
1191 | EXTENT_LOCKED, GFP_NOFS); | |
f4b9aa8d | 1192 | } |
be744175 | 1193 | BUG_ON(err < 0); |
e20d96d6 CM |
1194 | return 0; |
1195 | } | |
1196 | ||
fec577fb | 1197 | /* |
a28ec197 | 1198 | * remove an extent from the root, returns 0 on success |
fec577fb | 1199 | */ |
e089f05c | 1200 | static int __free_extent(struct btrfs_trans_handle *trans, struct btrfs_root |
7bb86316 CM |
1201 | *root, u64 bytenr, u64 num_bytes, |
1202 | u64 root_objectid, u64 ref_generation, | |
1203 | u64 owner_objectid, u64 owner_offset, int pin, | |
e37c9e69 | 1204 | int mark_free) |
a28ec197 | 1205 | { |
5caf2a00 | 1206 | struct btrfs_path *path; |
e2fa7227 | 1207 | struct btrfs_key key; |
1261ec42 CM |
1208 | struct btrfs_fs_info *info = root->fs_info; |
1209 | struct btrfs_root *extent_root = info->extent_root; | |
5f39d397 | 1210 | struct extent_buffer *leaf; |
a28ec197 | 1211 | int ret; |
234b63a0 | 1212 | struct btrfs_extent_item *ei; |
cf27e1ee | 1213 | u32 refs; |
037e6390 | 1214 | |
db94535d | 1215 | key.objectid = bytenr; |
62e2749e | 1216 | btrfs_set_key_type(&key, BTRFS_EXTENT_ITEM_KEY); |
db94535d | 1217 | key.offset = num_bytes; |
a28ec197 | 1218 | |
5caf2a00 | 1219 | path = btrfs_alloc_path(); |
54aa1f4d CM |
1220 | if (!path) |
1221 | return -ENOMEM; | |
5f26f772 | 1222 | |
7bb86316 CM |
1223 | ret = lookup_extent_backref(trans, extent_root, path, |
1224 | bytenr, root_objectid, | |
1225 | ref_generation, | |
1226 | owner_objectid, owner_offset, 1); | |
1227 | if (ret == 0) { | |
1228 | ret = btrfs_del_item(trans, extent_root, path); | |
1229 | } else { | |
1230 | btrfs_print_leaf(extent_root, path->nodes[0]); | |
1231 | WARN_ON(1); | |
1232 | printk("Unable to find ref byte nr %Lu root %Lu " | |
1233 | " gen %Lu owner %Lu offset %Lu\n", bytenr, | |
1234 | root_objectid, ref_generation, owner_objectid, | |
1235 | owner_offset); | |
1236 | } | |
1237 | btrfs_release_path(extent_root, path); | |
54aa1f4d CM |
1238 | ret = btrfs_search_slot(trans, extent_root, &key, path, -1, 1); |
1239 | if (ret < 0) | |
1240 | return ret; | |
1241 | BUG_ON(ret); | |
5f39d397 CM |
1242 | |
1243 | leaf = path->nodes[0]; | |
1244 | ei = btrfs_item_ptr(leaf, path->slots[0], | |
123abc88 | 1245 | struct btrfs_extent_item); |
5f39d397 CM |
1246 | refs = btrfs_extent_refs(leaf, ei); |
1247 | BUG_ON(refs == 0); | |
1248 | refs -= 1; | |
1249 | btrfs_set_extent_refs(leaf, ei, refs); | |
1250 | btrfs_mark_buffer_dirty(leaf); | |
1251 | ||
cf27e1ee | 1252 | if (refs == 0) { |
db94535d CM |
1253 | u64 super_used; |
1254 | u64 root_used; | |
78fae27e CM |
1255 | |
1256 | if (pin) { | |
db94535d | 1257 | ret = pin_down_bytes(root, bytenr, num_bytes, 0); |
c549228f Y |
1258 | if (ret > 0) |
1259 | mark_free = 1; | |
1260 | BUG_ON(ret < 0); | |
78fae27e CM |
1261 | } |
1262 | ||
58176a96 | 1263 | /* block accounting for super block */ |
db94535d CM |
1264 | super_used = btrfs_super_bytes_used(&info->super_copy); |
1265 | btrfs_set_super_bytes_used(&info->super_copy, | |
1266 | super_used - num_bytes); | |
58176a96 JB |
1267 | |
1268 | /* block accounting for root item */ | |
db94535d | 1269 | root_used = btrfs_root_used(&root->root_item); |
5f39d397 | 1270 | btrfs_set_root_used(&root->root_item, |
db94535d | 1271 | root_used - num_bytes); |
58176a96 | 1272 | |
5caf2a00 | 1273 | ret = btrfs_del_item(trans, extent_root, path); |
54aa1f4d CM |
1274 | if (ret) { |
1275 | return ret; | |
1276 | } | |
db94535d | 1277 | ret = update_block_group(trans, root, bytenr, num_bytes, 0, |
1e2677e0 | 1278 | mark_free, 0); |
9078a3e1 | 1279 | BUG_ON(ret); |
a28ec197 | 1280 | } |
5caf2a00 | 1281 | btrfs_free_path(path); |
e089f05c | 1282 | finish_current_insert(trans, extent_root); |
a28ec197 CM |
1283 | return ret; |
1284 | } | |
1285 | ||
a28ec197 CM |
1286 | /* |
1287 | * find all the blocks marked as pending in the radix tree and remove | |
1288 | * them from the extent map | |
1289 | */ | |
e089f05c CM |
1290 | static int del_pending_extents(struct btrfs_trans_handle *trans, struct |
1291 | btrfs_root *extent_root) | |
a28ec197 CM |
1292 | { |
1293 | int ret; | |
e20d96d6 | 1294 | int err = 0; |
1a5bc167 CM |
1295 | u64 start; |
1296 | u64 end; | |
1297 | struct extent_map_tree *pending_del; | |
1298 | struct extent_map_tree *pinned_extents; | |
8ef97622 | 1299 | |
1a5bc167 CM |
1300 | pending_del = &extent_root->fs_info->pending_del; |
1301 | pinned_extents = &extent_root->fs_info->pinned_extents; | |
a28ec197 CM |
1302 | |
1303 | while(1) { | |
1a5bc167 CM |
1304 | ret = find_first_extent_bit(pending_del, 0, &start, &end, |
1305 | EXTENT_LOCKED); | |
1306 | if (ret) | |
a28ec197 | 1307 | break; |
324ae4df | 1308 | update_pinned_extents(extent_root, start, end + 1 - start, 1); |
1a5bc167 CM |
1309 | clear_extent_bits(pending_del, start, end, EXTENT_LOCKED, |
1310 | GFP_NOFS); | |
1311 | ret = __free_extent(trans, extent_root, | |
7bb86316 CM |
1312 | start, end + 1 - start, |
1313 | extent_root->root_key.objectid, | |
1314 | 0, 0, 0, 0, 0); | |
1a5bc167 CM |
1315 | if (ret) |
1316 | err = ret; | |
fec577fb | 1317 | } |
e20d96d6 | 1318 | return err; |
fec577fb CM |
1319 | } |
1320 | ||
1321 | /* | |
1322 | * remove an extent from the root, returns 0 on success | |
1323 | */ | |
e089f05c | 1324 | int btrfs_free_extent(struct btrfs_trans_handle *trans, struct btrfs_root |
7bb86316 CM |
1325 | *root, u64 bytenr, u64 num_bytes, |
1326 | u64 root_objectid, u64 ref_generation, | |
1327 | u64 owner_objectid, u64 owner_offset, int pin) | |
fec577fb | 1328 | { |
9f5fae2f | 1329 | struct btrfs_root *extent_root = root->fs_info->extent_root; |
fec577fb CM |
1330 | int pending_ret; |
1331 | int ret; | |
a28ec197 | 1332 | |
db94535d | 1333 | WARN_ON(num_bytes < root->sectorsize); |
7bb86316 CM |
1334 | if (!root->ref_cows) |
1335 | ref_generation = 0; | |
1336 | ||
fec577fb | 1337 | if (root == extent_root) { |
db94535d | 1338 | pin_down_bytes(root, bytenr, num_bytes, 1); |
fec577fb CM |
1339 | return 0; |
1340 | } | |
7bb86316 CM |
1341 | ret = __free_extent(trans, root, bytenr, num_bytes, root_objectid, |
1342 | ref_generation, owner_objectid, owner_offset, | |
1343 | pin, pin == 0); | |
e20d96d6 | 1344 | pending_ret = del_pending_extents(trans, root->fs_info->extent_root); |
fec577fb CM |
1345 | return ret ? ret : pending_ret; |
1346 | } | |
1347 | ||
87ee04eb CM |
1348 | static u64 stripe_align(struct btrfs_root *root, u64 val) |
1349 | { | |
1350 | u64 mask = ((u64)root->stripesize - 1); | |
1351 | u64 ret = (val + mask) & ~mask; | |
1352 | return ret; | |
1353 | } | |
1354 | ||
fec577fb CM |
1355 | /* |
1356 | * walks the btree of allocated extents and find a hole of a given size. | |
1357 | * The key ins is changed to record the hole: | |
1358 | * ins->objectid == block start | |
62e2749e | 1359 | * ins->flags = BTRFS_EXTENT_ITEM_KEY |
fec577fb CM |
1360 | * ins->offset == number of blocks |
1361 | * Any available blocks before search_start are skipped. | |
1362 | */ | |
e089f05c | 1363 | static int find_free_extent(struct btrfs_trans_handle *trans, struct btrfs_root |
db94535d CM |
1364 | *orig_root, u64 num_bytes, u64 empty_size, |
1365 | u64 search_start, u64 search_end, u64 hint_byte, | |
f2654de4 CM |
1366 | struct btrfs_key *ins, u64 exclude_start, |
1367 | u64 exclude_nr, int data) | |
fec577fb | 1368 | { |
5caf2a00 | 1369 | struct btrfs_path *path; |
e2fa7227 | 1370 | struct btrfs_key key; |
fec577fb | 1371 | u64 hole_size = 0; |
87ee04eb CM |
1372 | u64 aligned; |
1373 | int ret; | |
fec577fb | 1374 | int slot = 0; |
db94535d | 1375 | u64 last_byte = 0; |
be744175 | 1376 | u64 orig_search_start = search_start; |
fec577fb | 1377 | int start_found; |
5f39d397 | 1378 | struct extent_buffer *l; |
9f5fae2f | 1379 | struct btrfs_root * root = orig_root->fs_info->extent_root; |
f2458e1d | 1380 | struct btrfs_fs_info *info = root->fs_info; |
db94535d | 1381 | u64 total_needed = num_bytes; |
e20d96d6 | 1382 | int level; |
be08c1b9 | 1383 | struct btrfs_block_group_cache *block_group; |
be744175 | 1384 | int full_scan = 0; |
fbdc762b | 1385 | int wrapped = 0; |
f84a8b36 | 1386 | u64 cached_start; |
fec577fb | 1387 | |
db94535d | 1388 | WARN_ON(num_bytes < root->sectorsize); |
b1a4d965 CM |
1389 | btrfs_set_key_type(ins, BTRFS_EXTENT_ITEM_KEY); |
1390 | ||
5f39d397 CM |
1391 | level = btrfs_header_level(root->node); |
1392 | ||
015a739c | 1393 | if (num_bytes >= 32 * 1024 * 1024 && hint_byte) { |
257d0ce3 CM |
1394 | data = BTRFS_BLOCK_GROUP_MIXED; |
1395 | } | |
1396 | ||
3e1ad54f | 1397 | if (search_end == (u64)-1) |
db94535d CM |
1398 | search_end = btrfs_super_total_bytes(&info->super_copy); |
1399 | if (hint_byte) { | |
1400 | block_group = btrfs_lookup_block_group(info, hint_byte); | |
1a2b2ac7 CM |
1401 | if (!block_group) |
1402 | hint_byte = search_start; | |
be744175 | 1403 | block_group = btrfs_find_block_group(root, block_group, |
db94535d | 1404 | hint_byte, data, 1); |
be744175 CM |
1405 | } else { |
1406 | block_group = btrfs_find_block_group(root, | |
1a2b2ac7 CM |
1407 | trans->block_group, |
1408 | search_start, data, 1); | |
be744175 CM |
1409 | } |
1410 | ||
6702ed49 | 1411 | total_needed += empty_size; |
e011599b | 1412 | path = btrfs_alloc_path(); |
be744175 | 1413 | check_failed: |
70b043f0 CM |
1414 | if (!block_group) { |
1415 | block_group = btrfs_lookup_block_group(info, search_start); | |
1416 | if (!block_group) | |
1417 | block_group = btrfs_lookup_block_group(info, | |
1418 | orig_search_start); | |
1419 | } | |
5e5745dc Y |
1420 | search_start = find_search_start(root, &block_group, search_start, |
1421 | total_needed, data, full_scan); | |
87ee04eb | 1422 | search_start = stripe_align(root, search_start); |
f84a8b36 | 1423 | cached_start = search_start; |
5caf2a00 | 1424 | btrfs_init_path(path); |
fec577fb CM |
1425 | ins->objectid = search_start; |
1426 | ins->offset = 0; | |
fec577fb | 1427 | start_found = 0; |
2cc58cf2 | 1428 | path->reada = 2; |
e37c9e69 | 1429 | |
5caf2a00 | 1430 | ret = btrfs_search_slot(trans, root, ins, path, 0, 0); |
0f70abe2 CM |
1431 | if (ret < 0) |
1432 | goto error; | |
aa5d6bed | 1433 | |
e37c9e69 | 1434 | if (path->slots[0] > 0) { |
5caf2a00 | 1435 | path->slots[0]--; |
e37c9e69 CM |
1436 | } |
1437 | ||
5f39d397 CM |
1438 | l = path->nodes[0]; |
1439 | btrfs_item_key_to_cpu(l, &key, path->slots[0]); | |
1440 | ||
e37c9e69 | 1441 | /* |
7bb86316 | 1442 | * walk backwards to find the first extent item key |
e37c9e69 | 1443 | */ |
7bb86316 CM |
1444 | while(btrfs_key_type(&key) != BTRFS_EXTENT_ITEM_KEY) { |
1445 | if (path->slots[0] == 0) { | |
1446 | ret = btrfs_prev_leaf(root, path); | |
1447 | if (ret != 0) { | |
1448 | ret = btrfs_search_slot(trans, root, ins, | |
1449 | path, 0, 0); | |
1450 | if (ret < 0) | |
1451 | goto error; | |
1452 | if (path->slots[0] > 0) | |
1453 | path->slots[0]--; | |
1454 | break; | |
1455 | } | |
1456 | } else { | |
e37c9e69 CM |
1457 | path->slots[0]--; |
1458 | } | |
7bb86316 CM |
1459 | l = path->nodes[0]; |
1460 | btrfs_item_key_to_cpu(l, &key, path->slots[0]); | |
e37c9e69 | 1461 | } |
fec577fb | 1462 | while (1) { |
5f39d397 | 1463 | l = path->nodes[0]; |
5caf2a00 | 1464 | slot = path->slots[0]; |
5f39d397 | 1465 | if (slot >= btrfs_header_nritems(l)) { |
5caf2a00 | 1466 | ret = btrfs_next_leaf(root, path); |
fec577fb CM |
1467 | if (ret == 0) |
1468 | continue; | |
0f70abe2 CM |
1469 | if (ret < 0) |
1470 | goto error; | |
e19caa5f CM |
1471 | |
1472 | search_start = max(search_start, | |
1473 | block_group->key.objectid); | |
fec577fb | 1474 | if (!start_found) { |
87ee04eb CM |
1475 | aligned = stripe_align(root, search_start); |
1476 | ins->objectid = aligned; | |
1477 | if (aligned >= search_end) { | |
1478 | ret = -ENOSPC; | |
1479 | goto error; | |
1480 | } | |
1481 | ins->offset = search_end - aligned; | |
fec577fb CM |
1482 | start_found = 1; |
1483 | goto check_pending; | |
1484 | } | |
87ee04eb CM |
1485 | ins->objectid = stripe_align(root, |
1486 | last_byte > search_start ? | |
1487 | last_byte : search_start); | |
1488 | if (search_end <= ins->objectid) { | |
1489 | ret = -ENOSPC; | |
1490 | goto error; | |
1491 | } | |
3e1ad54f | 1492 | ins->offset = search_end - ins->objectid; |
e19caa5f | 1493 | BUG_ON(ins->objectid >= search_end); |
fec577fb CM |
1494 | goto check_pending; |
1495 | } | |
5f39d397 | 1496 | btrfs_item_key_to_cpu(l, &key, slot); |
96b5179d | 1497 | |
db94535d | 1498 | if (key.objectid >= search_start && key.objectid > last_byte && |
e37c9e69 | 1499 | start_found) { |
db94535d CM |
1500 | if (last_byte < search_start) |
1501 | last_byte = search_start; | |
87ee04eb CM |
1502 | aligned = stripe_align(root, last_byte); |
1503 | hole_size = key.objectid - aligned; | |
1504 | if (key.objectid > aligned && hole_size >= num_bytes) { | |
1505 | ins->objectid = aligned; | |
e37c9e69 CM |
1506 | ins->offset = hole_size; |
1507 | goto check_pending; | |
0579da42 | 1508 | } |
fec577fb | 1509 | } |
96b5179d | 1510 | if (btrfs_key_type(&key) != BTRFS_EXTENT_ITEM_KEY) { |
7bb86316 CM |
1511 | if (!start_found && btrfs_key_type(&key) == |
1512 | BTRFS_BLOCK_GROUP_ITEM_KEY) { | |
db94535d | 1513 | last_byte = key.objectid; |
96b5179d CM |
1514 | start_found = 1; |
1515 | } | |
e37c9e69 | 1516 | goto next; |
96b5179d CM |
1517 | } |
1518 | ||
e37c9e69 | 1519 | |
0579da42 | 1520 | start_found = 1; |
db94535d | 1521 | last_byte = key.objectid + key.offset; |
f510cfec | 1522 | |
257d0ce3 CM |
1523 | if (!full_scan && data != BTRFS_BLOCK_GROUP_MIXED && |
1524 | last_byte >= block_group->key.objectid + | |
be744175 CM |
1525 | block_group->key.offset) { |
1526 | btrfs_release_path(root, path); | |
1527 | search_start = block_group->key.objectid + | |
e19caa5f | 1528 | block_group->key.offset; |
be744175 CM |
1529 | goto new_group; |
1530 | } | |
9078a3e1 | 1531 | next: |
5caf2a00 | 1532 | path->slots[0]++; |
de428b63 | 1533 | cond_resched(); |
fec577fb | 1534 | } |
fec577fb CM |
1535 | check_pending: |
1536 | /* we have to make sure we didn't find an extent that has already | |
1537 | * been allocated by the map tree or the original allocation | |
1538 | */ | |
5caf2a00 | 1539 | btrfs_release_path(root, path); |
fec577fb | 1540 | BUG_ON(ins->objectid < search_start); |
e37c9e69 | 1541 | |
db94535d | 1542 | if (ins->objectid + num_bytes >= search_end) |
cf67582b | 1543 | goto enospc; |
257d0ce3 | 1544 | if (!full_scan && data != BTRFS_BLOCK_GROUP_MIXED && |
5cf66426 | 1545 | ins->objectid + num_bytes > block_group-> |
e19caa5f CM |
1546 | key.objectid + block_group->key.offset) { |
1547 | search_start = block_group->key.objectid + | |
1548 | block_group->key.offset; | |
1549 | goto new_group; | |
1550 | } | |
1a5bc167 | 1551 | if (test_range_bit(&info->extent_ins, ins->objectid, |
db94535d CM |
1552 | ins->objectid + num_bytes -1, EXTENT_LOCKED, 0)) { |
1553 | search_start = ins->objectid + num_bytes; | |
1a5bc167 CM |
1554 | goto new_group; |
1555 | } | |
1556 | if (test_range_bit(&info->pinned_extents, ins->objectid, | |
db94535d CM |
1557 | ins->objectid + num_bytes -1, EXTENT_DIRTY, 0)) { |
1558 | search_start = ins->objectid + num_bytes; | |
1a5bc167 | 1559 | goto new_group; |
fec577fb | 1560 | } |
db94535d | 1561 | if (exclude_nr > 0 && (ins->objectid + num_bytes > exclude_start && |
f2654de4 CM |
1562 | ins->objectid < exclude_start + exclude_nr)) { |
1563 | search_start = exclude_start + exclude_nr; | |
1564 | goto new_group; | |
1565 | } | |
e37c9e69 | 1566 | if (!data) { |
5276aeda | 1567 | block_group = btrfs_lookup_block_group(info, ins->objectid); |
26b8003f CM |
1568 | if (block_group) |
1569 | trans->block_group = block_group; | |
f2458e1d | 1570 | } |
db94535d | 1571 | ins->offset = num_bytes; |
5caf2a00 | 1572 | btrfs_free_path(path); |
fec577fb | 1573 | return 0; |
be744175 CM |
1574 | |
1575 | new_group: | |
db94535d | 1576 | if (search_start + num_bytes >= search_end) { |
cf67582b | 1577 | enospc: |
be744175 | 1578 | search_start = orig_search_start; |
fbdc762b CM |
1579 | if (full_scan) { |
1580 | ret = -ENOSPC; | |
1581 | goto error; | |
1582 | } | |
6702ed49 CM |
1583 | if (wrapped) { |
1584 | if (!full_scan) | |
1585 | total_needed -= empty_size; | |
fbdc762b | 1586 | full_scan = 1; |
1a2b2ac7 | 1587 | data = BTRFS_BLOCK_GROUP_MIXED; |
6702ed49 | 1588 | } else |
fbdc762b | 1589 | wrapped = 1; |
be744175 | 1590 | } |
5276aeda | 1591 | block_group = btrfs_lookup_block_group(info, search_start); |
fbdc762b | 1592 | cond_resched(); |
1a2b2ac7 CM |
1593 | block_group = btrfs_find_block_group(root, block_group, |
1594 | search_start, data, 0); | |
be744175 CM |
1595 | goto check_failed; |
1596 | ||
0f70abe2 | 1597 | error: |
5caf2a00 CM |
1598 | btrfs_release_path(root, path); |
1599 | btrfs_free_path(path); | |
0f70abe2 | 1600 | return ret; |
fec577fb | 1601 | } |
fec577fb CM |
1602 | /* |
1603 | * finds a free extent and does all the dirty work required for allocation | |
1604 | * returns the key for the extent through ins, and a tree buffer for | |
1605 | * the first block of the extent through buf. | |
1606 | * | |
1607 | * returns 0 if everything worked, non-zero otherwise. | |
1608 | */ | |
4d775673 | 1609 | int btrfs_alloc_extent(struct btrfs_trans_handle *trans, |
7bb86316 CM |
1610 | struct btrfs_root *root, |
1611 | u64 num_bytes, u64 root_objectid, u64 ref_generation, | |
1612 | u64 owner, u64 owner_offset, | |
1613 | u64 empty_size, u64 hint_byte, | |
be08c1b9 | 1614 | u64 search_end, struct btrfs_key *ins, int data) |
fec577fb CM |
1615 | { |
1616 | int ret; | |
1617 | int pending_ret; | |
db94535d | 1618 | u64 super_used, root_used; |
fbdc762b | 1619 | u64 search_start = 0; |
edbd8d4e | 1620 | u64 new_hint; |
1261ec42 CM |
1621 | struct btrfs_fs_info *info = root->fs_info; |
1622 | struct btrfs_root *extent_root = info->extent_root; | |
234b63a0 | 1623 | struct btrfs_extent_item extent_item; |
7bb86316 | 1624 | struct btrfs_path *path; |
037e6390 | 1625 | |
5f39d397 | 1626 | btrfs_set_stack_extent_refs(&extent_item, 1); |
8f662a76 CM |
1627 | |
1628 | new_hint = max(hint_byte, root->fs_info->alloc_start); | |
edbd8d4e CM |
1629 | if (new_hint < btrfs_super_total_bytes(&info->super_copy)) |
1630 | hint_byte = new_hint; | |
8f662a76 | 1631 | |
db94535d CM |
1632 | WARN_ON(num_bytes < root->sectorsize); |
1633 | ret = find_free_extent(trans, root, num_bytes, empty_size, | |
1634 | search_start, search_end, hint_byte, ins, | |
26b8003f CM |
1635 | trans->alloc_exclude_start, |
1636 | trans->alloc_exclude_nr, data); | |
ccd467d6 | 1637 | BUG_ON(ret); |
f2654de4 CM |
1638 | if (ret) |
1639 | return ret; | |
fec577fb | 1640 | |
58176a96 | 1641 | /* block accounting for super block */ |
db94535d CM |
1642 | super_used = btrfs_super_bytes_used(&info->super_copy); |
1643 | btrfs_set_super_bytes_used(&info->super_copy, super_used + num_bytes); | |
26b8003f | 1644 | |
58176a96 | 1645 | /* block accounting for root item */ |
db94535d CM |
1646 | root_used = btrfs_root_used(&root->root_item); |
1647 | btrfs_set_root_used(&root->root_item, root_used + num_bytes); | |
58176a96 | 1648 | |
f510cfec CM |
1649 | clear_extent_dirty(&root->fs_info->free_space_cache, |
1650 | ins->objectid, ins->objectid + ins->offset - 1, | |
1651 | GFP_NOFS); | |
1652 | ||
26b8003f | 1653 | if (root == extent_root) { |
1a5bc167 CM |
1654 | set_extent_bits(&root->fs_info->extent_ins, ins->objectid, |
1655 | ins->objectid + ins->offset - 1, | |
1656 | EXTENT_LOCKED, GFP_NOFS); | |
e19caa5f | 1657 | WARN_ON(data == 1); |
26b8003f CM |
1658 | goto update_block; |
1659 | } | |
1660 | ||
1661 | WARN_ON(trans->alloc_exclude_nr); | |
1662 | trans->alloc_exclude_start = ins->objectid; | |
1663 | trans->alloc_exclude_nr = ins->offset; | |
e089f05c CM |
1664 | ret = btrfs_insert_item(trans, extent_root, ins, &extent_item, |
1665 | sizeof(extent_item)); | |
037e6390 | 1666 | |
26b8003f CM |
1667 | trans->alloc_exclude_start = 0; |
1668 | trans->alloc_exclude_nr = 0; | |
7bb86316 CM |
1669 | BUG_ON(ret); |
1670 | ||
1671 | path = btrfs_alloc_path(); | |
1672 | BUG_ON(!path); | |
1673 | ret = btrfs_insert_extent_backref(trans, extent_root, path, | |
1674 | ins->objectid, root_objectid, | |
1675 | ref_generation, owner, owner_offset); | |
26b8003f | 1676 | |
ccd467d6 | 1677 | BUG_ON(ret); |
7bb86316 | 1678 | btrfs_free_path(path); |
e089f05c | 1679 | finish_current_insert(trans, extent_root); |
e20d96d6 | 1680 | pending_ret = del_pending_extents(trans, extent_root); |
f510cfec | 1681 | |
e37c9e69 | 1682 | if (ret) { |
037e6390 | 1683 | return ret; |
e37c9e69 CM |
1684 | } |
1685 | if (pending_ret) { | |
037e6390 | 1686 | return pending_ret; |
e37c9e69 | 1687 | } |
26b8003f CM |
1688 | |
1689 | update_block: | |
1e2677e0 CM |
1690 | ret = update_block_group(trans, root, ins->objectid, ins->offset, 1, 0, |
1691 | data); | |
fabb5681 | 1692 | BUG_ON(ret); |
037e6390 | 1693 | return 0; |
fec577fb CM |
1694 | } |
1695 | ||
1696 | /* | |
1697 | * helper function to allocate a block for a given tree | |
1698 | * returns the tree buffer or NULL. | |
1699 | */ | |
5f39d397 | 1700 | struct extent_buffer *btrfs_alloc_free_block(struct btrfs_trans_handle *trans, |
db94535d | 1701 | struct btrfs_root *root, |
7bb86316 CM |
1702 | u32 blocksize, |
1703 | u64 root_objectid, u64 hint, | |
1704 | u64 empty_size) | |
1705 | { | |
1706 | u64 ref_generation; | |
1707 | ||
1708 | if (root->ref_cows) | |
1709 | ref_generation = trans->transid; | |
1710 | else | |
1711 | ref_generation = 0; | |
1712 | ||
1713 | ||
1714 | return __btrfs_alloc_free_block(trans, root, blocksize, root_objectid, | |
1715 | ref_generation, 0, 0, hint, empty_size); | |
1716 | } | |
1717 | ||
1718 | /* | |
1719 | * helper function to allocate a block for a given tree | |
1720 | * returns the tree buffer or NULL. | |
1721 | */ | |
1722 | struct extent_buffer *__btrfs_alloc_free_block(struct btrfs_trans_handle *trans, | |
1723 | struct btrfs_root *root, | |
1724 | u32 blocksize, | |
1725 | u64 root_objectid, | |
1726 | u64 ref_generation, | |
1727 | u64 first_objectid, | |
1728 | int level, | |
1729 | u64 hint, | |
5f39d397 | 1730 | u64 empty_size) |
fec577fb | 1731 | { |
e2fa7227 | 1732 | struct btrfs_key ins; |
fec577fb | 1733 | int ret; |
5f39d397 | 1734 | struct extent_buffer *buf; |
fec577fb | 1735 | |
7bb86316 CM |
1736 | ret = btrfs_alloc_extent(trans, root, blocksize, |
1737 | root_objectid, ref_generation, | |
f6dbff55 | 1738 | level, first_objectid, empty_size, hint, |
db94535d | 1739 | (u64)-1, &ins, 0); |
fec577fb | 1740 | if (ret) { |
54aa1f4d CM |
1741 | BUG_ON(ret > 0); |
1742 | return ERR_PTR(ret); | |
fec577fb | 1743 | } |
db94535d | 1744 | buf = btrfs_find_create_tree_block(root, ins.objectid, blocksize); |
54aa1f4d | 1745 | if (!buf) { |
7bb86316 CM |
1746 | btrfs_free_extent(trans, root, ins.objectid, blocksize, |
1747 | root->root_key.objectid, ref_generation, | |
1748 | 0, 0, 0); | |
54aa1f4d CM |
1749 | return ERR_PTR(-ENOMEM); |
1750 | } | |
5f39d397 CM |
1751 | btrfs_set_buffer_uptodate(buf); |
1752 | set_extent_dirty(&trans->transaction->dirty_pages, buf->start, | |
1753 | buf->start + buf->len - 1, GFP_NOFS); | |
19c00ddc CM |
1754 | set_extent_bits(&BTRFS_I(root->fs_info->btree_inode)->extent_tree, |
1755 | buf->start, buf->start + buf->len - 1, | |
1756 | EXTENT_CSUM, GFP_NOFS); | |
1757 | buf->flags |= EXTENT_CSUM; | |
6b80053d | 1758 | btrfs_set_buffer_defrag(buf); |
d3c2fdcf | 1759 | trans->blocks_used++; |
fec577fb CM |
1760 | return buf; |
1761 | } | |
a28ec197 | 1762 | |
6407bf6d | 1763 | static int drop_leaf_ref(struct btrfs_trans_handle *trans, |
5f39d397 | 1764 | struct btrfs_root *root, struct extent_buffer *leaf) |
6407bf6d | 1765 | { |
7bb86316 CM |
1766 | u64 leaf_owner; |
1767 | u64 leaf_generation; | |
5f39d397 | 1768 | struct btrfs_key key; |
6407bf6d CM |
1769 | struct btrfs_file_extent_item *fi; |
1770 | int i; | |
1771 | int nritems; | |
1772 | int ret; | |
1773 | ||
5f39d397 CM |
1774 | BUG_ON(!btrfs_is_leaf(leaf)); |
1775 | nritems = btrfs_header_nritems(leaf); | |
7bb86316 CM |
1776 | leaf_owner = btrfs_header_owner(leaf); |
1777 | leaf_generation = btrfs_header_generation(leaf); | |
1778 | ||
6407bf6d | 1779 | for (i = 0; i < nritems; i++) { |
db94535d | 1780 | u64 disk_bytenr; |
5f39d397 CM |
1781 | |
1782 | btrfs_item_key_to_cpu(leaf, &key, i); | |
1783 | if (btrfs_key_type(&key) != BTRFS_EXTENT_DATA_KEY) | |
6407bf6d CM |
1784 | continue; |
1785 | fi = btrfs_item_ptr(leaf, i, struct btrfs_file_extent_item); | |
5f39d397 CM |
1786 | if (btrfs_file_extent_type(leaf, fi) == |
1787 | BTRFS_FILE_EXTENT_INLINE) | |
236454df | 1788 | continue; |
6407bf6d CM |
1789 | /* |
1790 | * FIXME make sure to insert a trans record that | |
1791 | * repeats the snapshot del on crash | |
1792 | */ | |
db94535d CM |
1793 | disk_bytenr = btrfs_file_extent_disk_bytenr(leaf, fi); |
1794 | if (disk_bytenr == 0) | |
3a686375 | 1795 | continue; |
db94535d | 1796 | ret = btrfs_free_extent(trans, root, disk_bytenr, |
7bb86316 CM |
1797 | btrfs_file_extent_disk_num_bytes(leaf, fi), |
1798 | leaf_owner, leaf_generation, | |
1799 | key.objectid, key.offset, 0); | |
6407bf6d CM |
1800 | BUG_ON(ret); |
1801 | } | |
1802 | return 0; | |
1803 | } | |
1804 | ||
e011599b | 1805 | static void reada_walk_down(struct btrfs_root *root, |
5f39d397 | 1806 | struct extent_buffer *node) |
e011599b CM |
1807 | { |
1808 | int i; | |
1809 | u32 nritems; | |
db94535d | 1810 | u64 bytenr; |
e011599b CM |
1811 | int ret; |
1812 | u32 refs; | |
db94535d CM |
1813 | int level; |
1814 | u32 blocksize; | |
e011599b | 1815 | |
5f39d397 | 1816 | nritems = btrfs_header_nritems(node); |
db94535d | 1817 | level = btrfs_header_level(node); |
e011599b | 1818 | for (i = 0; i < nritems; i++) { |
db94535d CM |
1819 | bytenr = btrfs_node_blockptr(node, i); |
1820 | blocksize = btrfs_level_size(root, level - 1); | |
1821 | ret = lookup_extent_ref(NULL, root, bytenr, blocksize, &refs); | |
e011599b CM |
1822 | BUG_ON(ret); |
1823 | if (refs != 1) | |
1824 | continue; | |
409eb95d | 1825 | mutex_unlock(&root->fs_info->fs_mutex); |
db94535d | 1826 | ret = readahead_tree_block(root, bytenr, blocksize); |
409eb95d CM |
1827 | cond_resched(); |
1828 | mutex_lock(&root->fs_info->fs_mutex); | |
e011599b CM |
1829 | if (ret) |
1830 | break; | |
1831 | } | |
1832 | } | |
1833 | ||
9aca1d51 CM |
1834 | /* |
1835 | * helper function for drop_snapshot, this walks down the tree dropping ref | |
1836 | * counts as it goes. | |
1837 | */ | |
e089f05c CM |
1838 | static int walk_down_tree(struct btrfs_trans_handle *trans, struct btrfs_root |
1839 | *root, struct btrfs_path *path, int *level) | |
20524f02 | 1840 | { |
7bb86316 CM |
1841 | u64 root_owner; |
1842 | u64 root_gen; | |
1843 | u64 bytenr; | |
5f39d397 CM |
1844 | struct extent_buffer *next; |
1845 | struct extent_buffer *cur; | |
7bb86316 | 1846 | struct extent_buffer *parent; |
db94535d | 1847 | u32 blocksize; |
20524f02 CM |
1848 | int ret; |
1849 | u32 refs; | |
1850 | ||
5caf2a00 CM |
1851 | WARN_ON(*level < 0); |
1852 | WARN_ON(*level >= BTRFS_MAX_LEVEL); | |
5f39d397 | 1853 | ret = lookup_extent_ref(trans, root, |
db94535d CM |
1854 | path->nodes[*level]->start, |
1855 | path->nodes[*level]->len, &refs); | |
20524f02 CM |
1856 | BUG_ON(ret); |
1857 | if (refs > 1) | |
1858 | goto out; | |
e011599b | 1859 | |
9aca1d51 CM |
1860 | /* |
1861 | * walk down to the last node level and free all the leaves | |
1862 | */ | |
6407bf6d | 1863 | while(*level >= 0) { |
5caf2a00 CM |
1864 | WARN_ON(*level < 0); |
1865 | WARN_ON(*level >= BTRFS_MAX_LEVEL); | |
20524f02 | 1866 | cur = path->nodes[*level]; |
e011599b CM |
1867 | |
1868 | if (*level > 0 && path->slots[*level] == 0) | |
5f39d397 | 1869 | reada_walk_down(root, cur); |
e011599b | 1870 | |
5f39d397 | 1871 | if (btrfs_header_level(cur) != *level) |
2c90e5d6 | 1872 | WARN_ON(1); |
e011599b | 1873 | |
7518a238 | 1874 | if (path->slots[*level] >= |
5f39d397 | 1875 | btrfs_header_nritems(cur)) |
20524f02 | 1876 | break; |
6407bf6d CM |
1877 | if (*level == 0) { |
1878 | ret = drop_leaf_ref(trans, root, cur); | |
1879 | BUG_ON(ret); | |
1880 | break; | |
1881 | } | |
db94535d CM |
1882 | bytenr = btrfs_node_blockptr(cur, path->slots[*level]); |
1883 | blocksize = btrfs_level_size(root, *level - 1); | |
1884 | ret = lookup_extent_ref(trans, root, bytenr, blocksize, &refs); | |
6407bf6d CM |
1885 | BUG_ON(ret); |
1886 | if (refs != 1) { | |
7bb86316 CM |
1887 | parent = path->nodes[*level]; |
1888 | root_owner = btrfs_header_owner(parent); | |
1889 | root_gen = btrfs_header_generation(parent); | |
20524f02 | 1890 | path->slots[*level]++; |
db94535d | 1891 | ret = btrfs_free_extent(trans, root, bytenr, |
7bb86316 CM |
1892 | blocksize, root_owner, |
1893 | root_gen, 0, 0, 1); | |
20524f02 CM |
1894 | BUG_ON(ret); |
1895 | continue; | |
1896 | } | |
db94535d | 1897 | next = btrfs_find_tree_block(root, bytenr, blocksize); |
5f39d397 CM |
1898 | if (!next || !btrfs_buffer_uptodate(next)) { |
1899 | free_extent_buffer(next); | |
e9d0b13b | 1900 | mutex_unlock(&root->fs_info->fs_mutex); |
db94535d | 1901 | next = read_tree_block(root, bytenr, blocksize); |
e9d0b13b CM |
1902 | mutex_lock(&root->fs_info->fs_mutex); |
1903 | ||
1904 | /* we dropped the lock, check one more time */ | |
db94535d CM |
1905 | ret = lookup_extent_ref(trans, root, bytenr, |
1906 | blocksize, &refs); | |
e9d0b13b CM |
1907 | BUG_ON(ret); |
1908 | if (refs != 1) { | |
7bb86316 CM |
1909 | parent = path->nodes[*level]; |
1910 | root_owner = btrfs_header_owner(parent); | |
1911 | root_gen = btrfs_header_generation(parent); | |
1912 | ||
e9d0b13b | 1913 | path->slots[*level]++; |
5f39d397 | 1914 | free_extent_buffer(next); |
7bb86316 CM |
1915 | ret = btrfs_free_extent(trans, root, bytenr, |
1916 | blocksize, | |
1917 | root_owner, | |
1918 | root_gen, 0, 0, 1); | |
e9d0b13b CM |
1919 | BUG_ON(ret); |
1920 | continue; | |
1921 | } | |
1922 | } | |
5caf2a00 | 1923 | WARN_ON(*level <= 0); |
83e15a28 | 1924 | if (path->nodes[*level-1]) |
5f39d397 | 1925 | free_extent_buffer(path->nodes[*level-1]); |
20524f02 | 1926 | path->nodes[*level-1] = next; |
5f39d397 | 1927 | *level = btrfs_header_level(next); |
20524f02 CM |
1928 | path->slots[*level] = 0; |
1929 | } | |
1930 | out: | |
5caf2a00 CM |
1931 | WARN_ON(*level < 0); |
1932 | WARN_ON(*level >= BTRFS_MAX_LEVEL); | |
7bb86316 CM |
1933 | |
1934 | if (path->nodes[*level] == root->node) { | |
1935 | root_owner = root->root_key.objectid; | |
1936 | parent = path->nodes[*level]; | |
1937 | } else { | |
1938 | parent = path->nodes[*level + 1]; | |
1939 | root_owner = btrfs_header_owner(parent); | |
1940 | } | |
1941 | ||
1942 | root_gen = btrfs_header_generation(parent); | |
db94535d | 1943 | ret = btrfs_free_extent(trans, root, path->nodes[*level]->start, |
7bb86316 CM |
1944 | path->nodes[*level]->len, |
1945 | root_owner, root_gen, 0, 0, 1); | |
5f39d397 | 1946 | free_extent_buffer(path->nodes[*level]); |
20524f02 CM |
1947 | path->nodes[*level] = NULL; |
1948 | *level += 1; | |
1949 | BUG_ON(ret); | |
1950 | return 0; | |
1951 | } | |
1952 | ||
9aca1d51 CM |
1953 | /* |
1954 | * helper for dropping snapshots. This walks back up the tree in the path | |
1955 | * to find the first node higher up where we haven't yet gone through | |
1956 | * all the slots | |
1957 | */ | |
e089f05c CM |
1958 | static int walk_up_tree(struct btrfs_trans_handle *trans, struct btrfs_root |
1959 | *root, struct btrfs_path *path, int *level) | |
20524f02 | 1960 | { |
7bb86316 CM |
1961 | u64 root_owner; |
1962 | u64 root_gen; | |
1963 | struct btrfs_root_item *root_item = &root->root_item; | |
20524f02 CM |
1964 | int i; |
1965 | int slot; | |
1966 | int ret; | |
9f3a7427 | 1967 | |
234b63a0 | 1968 | for(i = *level; i < BTRFS_MAX_LEVEL - 1 && path->nodes[i]; i++) { |
20524f02 | 1969 | slot = path->slots[i]; |
5f39d397 CM |
1970 | if (slot < btrfs_header_nritems(path->nodes[i]) - 1) { |
1971 | struct extent_buffer *node; | |
1972 | struct btrfs_disk_key disk_key; | |
1973 | node = path->nodes[i]; | |
20524f02 CM |
1974 | path->slots[i]++; |
1975 | *level = i; | |
9f3a7427 | 1976 | WARN_ON(*level == 0); |
5f39d397 | 1977 | btrfs_node_key(node, &disk_key, path->slots[i]); |
9f3a7427 | 1978 | memcpy(&root_item->drop_progress, |
5f39d397 | 1979 | &disk_key, sizeof(disk_key)); |
9f3a7427 | 1980 | root_item->drop_level = i; |
20524f02 CM |
1981 | return 0; |
1982 | } else { | |
7bb86316 CM |
1983 | if (path->nodes[*level] == root->node) { |
1984 | root_owner = root->root_key.objectid; | |
1985 | root_gen = | |
1986 | btrfs_header_generation(path->nodes[*level]); | |
1987 | } else { | |
1988 | struct extent_buffer *node; | |
1989 | node = path->nodes[*level + 1]; | |
1990 | root_owner = btrfs_header_owner(node); | |
1991 | root_gen = btrfs_header_generation(node); | |
1992 | } | |
e089f05c | 1993 | ret = btrfs_free_extent(trans, root, |
db94535d | 1994 | path->nodes[*level]->start, |
7bb86316 CM |
1995 | path->nodes[*level]->len, |
1996 | root_owner, root_gen, 0, 0, 1); | |
6407bf6d | 1997 | BUG_ON(ret); |
5f39d397 | 1998 | free_extent_buffer(path->nodes[*level]); |
83e15a28 | 1999 | path->nodes[*level] = NULL; |
20524f02 | 2000 | *level = i + 1; |
20524f02 CM |
2001 | } |
2002 | } | |
2003 | return 1; | |
2004 | } | |
2005 | ||
9aca1d51 CM |
2006 | /* |
2007 | * drop the reference count on the tree rooted at 'snap'. This traverses | |
2008 | * the tree freeing any blocks that have a ref count of zero after being | |
2009 | * decremented. | |
2010 | */ | |
e089f05c | 2011 | int btrfs_drop_snapshot(struct btrfs_trans_handle *trans, struct btrfs_root |
9f3a7427 | 2012 | *root) |
20524f02 | 2013 | { |
3768f368 | 2014 | int ret = 0; |
9aca1d51 | 2015 | int wret; |
20524f02 | 2016 | int level; |
5caf2a00 | 2017 | struct btrfs_path *path; |
20524f02 CM |
2018 | int i; |
2019 | int orig_level; | |
9f3a7427 | 2020 | struct btrfs_root_item *root_item = &root->root_item; |
20524f02 | 2021 | |
5caf2a00 CM |
2022 | path = btrfs_alloc_path(); |
2023 | BUG_ON(!path); | |
20524f02 | 2024 | |
5f39d397 | 2025 | level = btrfs_header_level(root->node); |
20524f02 | 2026 | orig_level = level; |
9f3a7427 CM |
2027 | if (btrfs_disk_key_objectid(&root_item->drop_progress) == 0) { |
2028 | path->nodes[level] = root->node; | |
f510cfec | 2029 | extent_buffer_get(root->node); |
9f3a7427 CM |
2030 | path->slots[level] = 0; |
2031 | } else { | |
2032 | struct btrfs_key key; | |
5f39d397 CM |
2033 | struct btrfs_disk_key found_key; |
2034 | struct extent_buffer *node; | |
6702ed49 | 2035 | |
9f3a7427 | 2036 | btrfs_disk_key_to_cpu(&key, &root_item->drop_progress); |
6702ed49 CM |
2037 | level = root_item->drop_level; |
2038 | path->lowest_level = level; | |
9f3a7427 | 2039 | wret = btrfs_search_slot(NULL, root, &key, path, 0, 0); |
6702ed49 | 2040 | if (wret < 0) { |
9f3a7427 CM |
2041 | ret = wret; |
2042 | goto out; | |
2043 | } | |
5f39d397 CM |
2044 | node = path->nodes[level]; |
2045 | btrfs_node_key(node, &found_key, path->slots[level]); | |
2046 | WARN_ON(memcmp(&found_key, &root_item->drop_progress, | |
2047 | sizeof(found_key))); | |
9f3a7427 | 2048 | } |
20524f02 | 2049 | while(1) { |
5caf2a00 | 2050 | wret = walk_down_tree(trans, root, path, &level); |
9aca1d51 | 2051 | if (wret > 0) |
20524f02 | 2052 | break; |
9aca1d51 CM |
2053 | if (wret < 0) |
2054 | ret = wret; | |
2055 | ||
5caf2a00 | 2056 | wret = walk_up_tree(trans, root, path, &level); |
9aca1d51 | 2057 | if (wret > 0) |
20524f02 | 2058 | break; |
9aca1d51 CM |
2059 | if (wret < 0) |
2060 | ret = wret; | |
409eb95d | 2061 | ret = -EAGAIN; |
409eb95d | 2062 | break; |
20524f02 | 2063 | } |
83e15a28 | 2064 | for (i = 0; i <= orig_level; i++) { |
5caf2a00 | 2065 | if (path->nodes[i]) { |
5f39d397 | 2066 | free_extent_buffer(path->nodes[i]); |
0f82731f | 2067 | path->nodes[i] = NULL; |
83e15a28 | 2068 | } |
20524f02 | 2069 | } |
9f3a7427 | 2070 | out: |
5caf2a00 | 2071 | btrfs_free_path(path); |
9aca1d51 | 2072 | return ret; |
20524f02 | 2073 | } |
9078a3e1 | 2074 | |
96b5179d | 2075 | int btrfs_free_block_groups(struct btrfs_fs_info *info) |
9078a3e1 | 2076 | { |
96b5179d CM |
2077 | u64 start; |
2078 | u64 end; | |
b97f9203 | 2079 | u64 ptr; |
9078a3e1 | 2080 | int ret; |
9078a3e1 | 2081 | while(1) { |
96b5179d CM |
2082 | ret = find_first_extent_bit(&info->block_group_cache, 0, |
2083 | &start, &end, (unsigned int)-1); | |
2084 | if (ret) | |
9078a3e1 | 2085 | break; |
b97f9203 Y |
2086 | ret = get_state_private(&info->block_group_cache, start, &ptr); |
2087 | if (!ret) | |
2088 | kfree((void *)(unsigned long)ptr); | |
96b5179d CM |
2089 | clear_extent_bits(&info->block_group_cache, start, |
2090 | end, (unsigned int)-1, GFP_NOFS); | |
9078a3e1 | 2091 | } |
e37c9e69 | 2092 | while(1) { |
f510cfec CM |
2093 | ret = find_first_extent_bit(&info->free_space_cache, 0, |
2094 | &start, &end, EXTENT_DIRTY); | |
2095 | if (ret) | |
e37c9e69 | 2096 | break; |
f510cfec CM |
2097 | clear_extent_dirty(&info->free_space_cache, start, |
2098 | end, GFP_NOFS); | |
e37c9e69 | 2099 | } |
be744175 CM |
2100 | return 0; |
2101 | } | |
2102 | ||
edbd8d4e CM |
2103 | static int relocate_inode_pages(struct inode *inode, u64 start, u64 len) |
2104 | { | |
2105 | u64 page_start; | |
2106 | u64 page_end; | |
2107 | u64 delalloc_start; | |
2108 | u64 existing_delalloc; | |
2109 | unsigned long last_index; | |
edbd8d4e CM |
2110 | unsigned long i; |
2111 | struct page *page; | |
2112 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
2113 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; | |
4313b399 CM |
2114 | struct file_ra_state *ra; |
2115 | ||
2116 | ra = kzalloc(sizeof(*ra), GFP_NOFS); | |
edbd8d4e CM |
2117 | |
2118 | mutex_lock(&inode->i_mutex); | |
4313b399 | 2119 | i = start >> PAGE_CACHE_SHIFT; |
edbd8d4e CM |
2120 | last_index = (start + len - 1) >> PAGE_CACHE_SHIFT; |
2121 | ||
4313b399 CM |
2122 | file_ra_state_init(ra, inode->i_mapping); |
2123 | btrfs_force_ra(inode->i_mapping, ra, NULL, i, last_index); | |
2124 | kfree(ra); | |
edbd8d4e | 2125 | |
4313b399 | 2126 | for (; i <= last_index; i++) { |
edbd8d4e CM |
2127 | page = grab_cache_page(inode->i_mapping, i); |
2128 | if (!page) | |
2129 | goto out_unlock; | |
2130 | if (!PageUptodate(page)) { | |
2131 | btrfs_readpage(NULL, page); | |
2132 | lock_page(page); | |
2133 | if (!PageUptodate(page)) { | |
2134 | unlock_page(page); | |
2135 | page_cache_release(page); | |
2136 | goto out_unlock; | |
2137 | } | |
2138 | } | |
2139 | page_start = (u64)page->index << PAGE_CACHE_SHIFT; | |
2140 | page_end = page_start + PAGE_CACHE_SIZE - 1; | |
2141 | ||
2142 | lock_extent(em_tree, page_start, page_end, GFP_NOFS); | |
2143 | ||
2144 | delalloc_start = page_start; | |
2145 | existing_delalloc = | |
2146 | count_range_bits(&BTRFS_I(inode)->extent_tree, | |
2147 | &delalloc_start, page_end, | |
2148 | PAGE_CACHE_SIZE, EXTENT_DELALLOC); | |
2149 | ||
2150 | set_extent_delalloc(em_tree, page_start, | |
2151 | page_end, GFP_NOFS); | |
2152 | ||
2153 | spin_lock(&root->fs_info->delalloc_lock); | |
2154 | root->fs_info->delalloc_bytes += PAGE_CACHE_SIZE - | |
2155 | existing_delalloc; | |
2156 | spin_unlock(&root->fs_info->delalloc_lock); | |
2157 | ||
2158 | unlock_extent(em_tree, page_start, page_end, GFP_NOFS); | |
2159 | set_page_dirty(page); | |
2160 | unlock_page(page); | |
2161 | page_cache_release(page); | |
2162 | } | |
2163 | ||
2164 | out_unlock: | |
2165 | mutex_unlock(&inode->i_mutex); | |
2166 | return 0; | |
2167 | } | |
2168 | ||
4313b399 CM |
2169 | /* |
2170 | * note, this releases the path | |
2171 | */ | |
edbd8d4e CM |
2172 | static int relocate_one_reference(struct btrfs_root *extent_root, |
2173 | struct btrfs_path *path, | |
4313b399 | 2174 | struct btrfs_key *extent_key) |
edbd8d4e CM |
2175 | { |
2176 | struct inode *inode; | |
2177 | struct btrfs_root *found_root; | |
4313b399 CM |
2178 | struct btrfs_key *root_location; |
2179 | struct btrfs_extent_ref *ref; | |
2180 | u64 ref_root; | |
2181 | u64 ref_gen; | |
2182 | u64 ref_objectid; | |
2183 | u64 ref_offset; | |
edbd8d4e CM |
2184 | int ret; |
2185 | ||
4313b399 CM |
2186 | ref = btrfs_item_ptr(path->nodes[0], path->slots[0], |
2187 | struct btrfs_extent_ref); | |
2188 | ref_root = btrfs_ref_root(path->nodes[0], ref); | |
2189 | ref_gen = btrfs_ref_generation(path->nodes[0], ref); | |
2190 | ref_objectid = btrfs_ref_objectid(path->nodes[0], ref); | |
2191 | ref_offset = btrfs_ref_offset(path->nodes[0], ref); | |
2192 | btrfs_release_path(extent_root, path); | |
2193 | ||
2194 | root_location = kmalloc(sizeof(*root_location), GFP_NOFS); | |
2195 | root_location->objectid = ref_root; | |
edbd8d4e | 2196 | if (ref_gen == 0) |
4313b399 | 2197 | root_location->offset = 0; |
edbd8d4e | 2198 | else |
4313b399 CM |
2199 | root_location->offset = (u64)-1; |
2200 | root_location->type = BTRFS_ROOT_ITEM_KEY; | |
edbd8d4e CM |
2201 | |
2202 | found_root = btrfs_read_fs_root_no_name(extent_root->fs_info, | |
4313b399 | 2203 | root_location); |
edbd8d4e | 2204 | BUG_ON(!found_root); |
4313b399 | 2205 | kfree(root_location); |
edbd8d4e CM |
2206 | |
2207 | if (ref_objectid >= BTRFS_FIRST_FREE_OBJECTID) { | |
2208 | mutex_unlock(&extent_root->fs_info->fs_mutex); | |
2209 | inode = btrfs_iget_locked(extent_root->fs_info->sb, | |
2210 | ref_objectid, found_root); | |
2211 | if (inode->i_state & I_NEW) { | |
2212 | /* the inode and parent dir are two different roots */ | |
2213 | BTRFS_I(inode)->root = found_root; | |
2214 | BTRFS_I(inode)->location.objectid = ref_objectid; | |
2215 | BTRFS_I(inode)->location.type = BTRFS_INODE_ITEM_KEY; | |
2216 | BTRFS_I(inode)->location.offset = 0; | |
2217 | btrfs_read_locked_inode(inode); | |
2218 | unlock_new_inode(inode); | |
2219 | ||
2220 | } | |
2221 | /* this can happen if the reference is not against | |
2222 | * the latest version of the tree root | |
2223 | */ | |
2224 | if (is_bad_inode(inode)) { | |
2225 | mutex_lock(&extent_root->fs_info->fs_mutex); | |
2226 | goto out; | |
2227 | } | |
2228 | relocate_inode_pages(inode, ref_offset, extent_key->offset); | |
2229 | /* FIXME, data=ordered will help get rid of this */ | |
2230 | filemap_fdatawrite(inode->i_mapping); | |
2231 | iput(inode); | |
2232 | mutex_lock(&extent_root->fs_info->fs_mutex); | |
2233 | } else { | |
2234 | struct btrfs_trans_handle *trans; | |
2235 | struct btrfs_key found_key; | |
2236 | struct extent_buffer *eb; | |
2237 | int level; | |
2238 | int i; | |
2239 | ||
2240 | trans = btrfs_start_transaction(found_root, 1); | |
2241 | eb = read_tree_block(found_root, extent_key->objectid, | |
2242 | extent_key->offset); | |
2243 | level = btrfs_header_level(eb); | |
2244 | ||
2245 | if (level == 0) | |
2246 | btrfs_item_key_to_cpu(eb, &found_key, 0); | |
2247 | else | |
2248 | btrfs_node_key_to_cpu(eb, &found_key, 0); | |
2249 | ||
2250 | free_extent_buffer(eb); | |
2251 | ||
2252 | path->lowest_level = level; | |
8f662a76 | 2253 | path->reada = 2; |
edbd8d4e CM |
2254 | ret = btrfs_search_slot(trans, found_root, &found_key, path, |
2255 | 0, 1); | |
2256 | path->lowest_level = 0; | |
2257 | for (i = level; i < BTRFS_MAX_LEVEL; i++) { | |
2258 | if (!path->nodes[i]) | |
2259 | break; | |
2260 | free_extent_buffer(path->nodes[i]); | |
2261 | path->nodes[i] = NULL; | |
2262 | } | |
2263 | btrfs_release_path(found_root, path); | |
2264 | btrfs_end_transaction(trans, found_root); | |
2265 | } | |
2266 | ||
2267 | out: | |
2268 | return 0; | |
2269 | } | |
2270 | ||
2271 | static int relocate_one_extent(struct btrfs_root *extent_root, | |
2272 | struct btrfs_path *path, | |
2273 | struct btrfs_key *extent_key) | |
2274 | { | |
2275 | struct btrfs_key key; | |
2276 | struct btrfs_key found_key; | |
edbd8d4e | 2277 | struct extent_buffer *leaf; |
edbd8d4e CM |
2278 | u32 nritems; |
2279 | u32 item_size; | |
2280 | int ret = 0; | |
2281 | ||
2282 | key.objectid = extent_key->objectid; | |
2283 | key.type = BTRFS_EXTENT_REF_KEY; | |
2284 | key.offset = 0; | |
2285 | ||
2286 | while(1) { | |
2287 | ret = btrfs_search_slot(NULL, extent_root, &key, path, 0, 0); | |
2288 | ||
2289 | BUG_ON(ret == 0); | |
2290 | ||
2291 | if (ret < 0) | |
2292 | goto out; | |
2293 | ||
2294 | ret = 0; | |
2295 | leaf = path->nodes[0]; | |
2296 | nritems = btrfs_header_nritems(leaf); | |
2297 | if (path->slots[0] == nritems) | |
2298 | goto out; | |
2299 | ||
2300 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); | |
2301 | if (found_key.objectid != extent_key->objectid) | |
2302 | break; | |
2303 | ||
2304 | if (found_key.type != BTRFS_EXTENT_REF_KEY) | |
2305 | break; | |
2306 | ||
2307 | key.offset = found_key.offset + 1; | |
2308 | item_size = btrfs_item_size_nr(leaf, path->slots[0]); | |
2309 | ||
4313b399 | 2310 | ret = relocate_one_reference(extent_root, path, extent_key); |
edbd8d4e CM |
2311 | if (ret) |
2312 | goto out; | |
2313 | } | |
2314 | ret = 0; | |
2315 | out: | |
2316 | btrfs_release_path(extent_root, path); | |
2317 | return ret; | |
2318 | } | |
2319 | ||
2320 | static int find_overlapping_extent(struct btrfs_root *root, | |
2321 | struct btrfs_path *path, u64 new_size) | |
2322 | { | |
2323 | struct btrfs_key found_key; | |
2324 | struct extent_buffer *leaf; | |
2325 | int ret; | |
2326 | ||
2327 | while(1) { | |
2328 | if (path->slots[0] == 0) { | |
2329 | ret = btrfs_prev_leaf(root, path); | |
2330 | if (ret == 1) { | |
2331 | return 1; | |
2332 | } | |
2333 | if (ret < 0) | |
2334 | return ret; | |
2335 | } else { | |
2336 | path->slots[0]--; | |
2337 | } | |
2338 | leaf = path->nodes[0]; | |
2339 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); | |
2340 | if (found_key.type == BTRFS_EXTENT_ITEM_KEY) { | |
2341 | if (found_key.objectid + found_key.offset > new_size) | |
2342 | return 0; | |
2343 | else | |
2344 | return 1; | |
2345 | } | |
2346 | } | |
2347 | return 1; | |
2348 | } | |
2349 | ||
2350 | int btrfs_shrink_extent_tree(struct btrfs_root *root, u64 new_size) | |
2351 | { | |
2352 | struct btrfs_trans_handle *trans; | |
2353 | struct btrfs_root *tree_root = root->fs_info->tree_root; | |
2354 | struct btrfs_path *path; | |
2355 | u64 cur_byte; | |
2356 | u64 total_found; | |
edbd8d4e CM |
2357 | struct btrfs_fs_info *info = root->fs_info; |
2358 | struct extent_map_tree *block_group_cache; | |
2359 | struct btrfs_key key; | |
2360 | struct btrfs_key found_key = { 0, 0, 0 }; | |
2361 | struct extent_buffer *leaf; | |
2362 | u32 nritems; | |
2363 | int ret; | |
2364 | int slot; | |
2365 | ||
2366 | btrfs_set_super_total_bytes(&info->super_copy, new_size); | |
2367 | block_group_cache = &info->block_group_cache; | |
2368 | path = btrfs_alloc_path(); | |
2369 | root = root->fs_info->extent_root; | |
8f662a76 | 2370 | path->reada = 2; |
edbd8d4e CM |
2371 | |
2372 | again: | |
2373 | total_found = 0; | |
2374 | key.objectid = new_size; | |
2375 | cur_byte = key.objectid; | |
2376 | key.offset = 0; | |
2377 | key.type = 0; | |
2378 | while(1) { | |
4313b399 | 2379 | |
edbd8d4e CM |
2380 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); |
2381 | if (ret < 0) | |
2382 | goto out; | |
2383 | next: | |
2384 | leaf = path->nodes[0]; | |
2385 | if (key.objectid == new_size - 1) { | |
2386 | ret = find_overlapping_extent(root, path, new_size); | |
2387 | if (ret != 0) { | |
2388 | btrfs_release_path(root, path); | |
2389 | ret = btrfs_search_slot(NULL, root, &key, | |
2390 | path, 0, 0); | |
2391 | if (ret < 0) | |
2392 | goto out; | |
2393 | } | |
2394 | } | |
2395 | nritems = btrfs_header_nritems(leaf); | |
2396 | ret = 0; | |
2397 | slot = path->slots[0]; | |
2398 | if (slot < nritems) | |
2399 | btrfs_item_key_to_cpu(leaf, &found_key, slot); | |
2400 | if (slot == nritems || | |
2401 | btrfs_key_type(&found_key) != BTRFS_EXTENT_ITEM_KEY) { | |
2402 | path->slots[0]++; | |
2403 | if (path->slots[0] >= nritems) { | |
2404 | ret = btrfs_next_leaf(root, path); | |
2405 | if (ret < 0) | |
2406 | goto out; | |
2407 | if (ret == 1) { | |
2408 | ret = 0; | |
2409 | break; | |
2410 | } | |
2411 | } | |
2412 | goto next; | |
2413 | } | |
2414 | btrfs_item_key_to_cpu(leaf, &found_key, slot); | |
2415 | if (found_key.objectid + found_key.offset <= cur_byte) | |
2416 | continue; | |
2417 | total_found++; | |
2418 | cur_byte = found_key.objectid + found_key.offset; | |
2419 | key.objectid = cur_byte; | |
2420 | btrfs_release_path(root, path); | |
2421 | ret = relocate_one_extent(root, path, &found_key); | |
2422 | } | |
2423 | ||
2424 | btrfs_release_path(root, path); | |
2425 | ||
2426 | if (total_found > 0) { | |
2427 | trans = btrfs_start_transaction(tree_root, 1); | |
2428 | btrfs_commit_transaction(trans, tree_root); | |
2429 | ||
2430 | mutex_unlock(&root->fs_info->fs_mutex); | |
2431 | btrfs_clean_old_snapshots(tree_root); | |
2432 | mutex_lock(&root->fs_info->fs_mutex); | |
2433 | ||
2434 | trans = btrfs_start_transaction(tree_root, 1); | |
2435 | btrfs_commit_transaction(trans, tree_root); | |
2436 | goto again; | |
2437 | } | |
2438 | ||
2439 | trans = btrfs_start_transaction(root, 1); | |
2440 | key.objectid = new_size; | |
2441 | key.offset = 0; | |
2442 | key.type = 0; | |
2443 | while(1) { | |
4313b399 CM |
2444 | u64 ptr; |
2445 | ||
edbd8d4e CM |
2446 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); |
2447 | if (ret < 0) | |
2448 | goto out; | |
2449 | bg_next: | |
2450 | leaf = path->nodes[0]; | |
2451 | nritems = btrfs_header_nritems(leaf); | |
2452 | ret = 0; | |
2453 | slot = path->slots[0]; | |
2454 | if (slot < nritems) | |
2455 | btrfs_item_key_to_cpu(leaf, &found_key, slot); | |
2456 | if (slot == nritems || | |
2457 | btrfs_key_type(&found_key) != BTRFS_BLOCK_GROUP_ITEM_KEY) { | |
2458 | if (slot < nritems) { | |
2459 | printk("shrinker found key %Lu %u %Lu\n", | |
2460 | found_key.objectid, found_key.type, | |
2461 | found_key.offset); | |
2462 | path->slots[0]++; | |
2463 | } | |
2464 | if (path->slots[0] >= nritems) { | |
2465 | ret = btrfs_next_leaf(root, path); | |
2466 | if (ret < 0) | |
2467 | break; | |
2468 | if (ret == 1) { | |
2469 | ret = 0; | |
2470 | break; | |
2471 | } | |
2472 | } | |
2473 | goto bg_next; | |
2474 | } | |
2475 | btrfs_item_key_to_cpu(leaf, &found_key, slot); | |
2476 | ret = get_state_private(&info->block_group_cache, | |
2477 | found_key.objectid, &ptr); | |
2478 | if (!ret) | |
2479 | kfree((void *)(unsigned long)ptr); | |
2480 | ||
2481 | clear_extent_bits(&info->block_group_cache, found_key.objectid, | |
2482 | found_key.objectid + found_key.offset - 1, | |
2483 | (unsigned int)-1, GFP_NOFS); | |
2484 | ||
2485 | key.objectid = found_key.objectid + 1; | |
2486 | btrfs_del_item(trans, root, path); | |
2487 | btrfs_release_path(root, path); | |
2488 | } | |
2489 | clear_extent_dirty(&info->free_space_cache, new_size, (u64)-1, | |
2490 | GFP_NOFS); | |
2491 | btrfs_commit_transaction(trans, root); | |
2492 | out: | |
2493 | btrfs_free_path(path); | |
2494 | return ret; | |
2495 | } | |
2496 | ||
2497 | int btrfs_grow_extent_tree(struct btrfs_trans_handle *trans, | |
2498 | struct btrfs_root *root, u64 new_size) | |
2499 | { | |
2500 | struct btrfs_path *path; | |
2501 | u64 nr = 0; | |
2502 | u64 cur_byte; | |
2503 | u64 old_size; | |
f9ef6604 | 2504 | unsigned long rem; |
edbd8d4e CM |
2505 | struct btrfs_block_group_cache *cache; |
2506 | struct btrfs_block_group_item *item; | |
2507 | struct btrfs_fs_info *info = root->fs_info; | |
2508 | struct extent_map_tree *block_group_cache; | |
2509 | struct btrfs_key key; | |
2510 | struct extent_buffer *leaf; | |
2511 | int ret; | |
2512 | int bit; | |
2513 | ||
2514 | old_size = btrfs_super_total_bytes(&info->super_copy); | |
2515 | block_group_cache = &info->block_group_cache; | |
2516 | ||
2517 | root = info->extent_root; | |
2518 | ||
2519 | cache = btrfs_lookup_block_group(root->fs_info, old_size - 1); | |
2520 | ||
2521 | cur_byte = cache->key.objectid + cache->key.offset; | |
2522 | if (cur_byte >= new_size) | |
2523 | goto set_size; | |
2524 | ||
2525 | key.offset = BTRFS_BLOCK_GROUP_SIZE; | |
2526 | btrfs_set_key_type(&key, BTRFS_BLOCK_GROUP_ITEM_KEY); | |
2527 | ||
2528 | path = btrfs_alloc_path(); | |
2529 | if (!path) | |
2530 | return -ENOMEM; | |
2531 | ||
2532 | while(cur_byte < new_size) { | |
2533 | key.objectid = cur_byte; | |
2534 | ret = btrfs_insert_empty_item(trans, root, path, &key, | |
2535 | sizeof(struct btrfs_block_group_item)); | |
2536 | BUG_ON(ret); | |
2537 | leaf = path->nodes[0]; | |
2538 | item = btrfs_item_ptr(leaf, path->slots[0], | |
2539 | struct btrfs_block_group_item); | |
2540 | ||
2541 | btrfs_set_disk_block_group_used(leaf, item, 0); | |
f9ef6604 CM |
2542 | div_long_long_rem(nr, 3, &rem); |
2543 | if (rem) { | |
edbd8d4e CM |
2544 | btrfs_set_disk_block_group_flags(leaf, item, |
2545 | BTRFS_BLOCK_GROUP_DATA); | |
2546 | } else { | |
2547 | btrfs_set_disk_block_group_flags(leaf, item, 0); | |
2548 | } | |
2549 | nr++; | |
2550 | ||
2551 | cache = kmalloc(sizeof(*cache), GFP_NOFS); | |
2552 | BUG_ON(!cache); | |
2553 | ||
2554 | read_extent_buffer(leaf, &cache->item, (unsigned long)item, | |
2555 | sizeof(cache->item)); | |
2556 | ||
2557 | memcpy(&cache->key, &key, sizeof(key)); | |
2558 | cache->cached = 0; | |
2559 | cache->pinned = 0; | |
2560 | cur_byte = key.objectid + key.offset; | |
2561 | btrfs_release_path(root, path); | |
2562 | ||
2563 | if (cache->item.flags & BTRFS_BLOCK_GROUP_DATA) { | |
2564 | bit = BLOCK_GROUP_DATA; | |
2565 | cache->data = BTRFS_BLOCK_GROUP_DATA; | |
2566 | } else { | |
2567 | bit = BLOCK_GROUP_METADATA; | |
2568 | cache->data = 0; | |
2569 | } | |
2570 | ||
2571 | /* use EXTENT_LOCKED to prevent merging */ | |
2572 | set_extent_bits(block_group_cache, key.objectid, | |
2573 | key.objectid + key.offset - 1, | |
2574 | bit | EXTENT_LOCKED, GFP_NOFS); | |
2575 | set_state_private(block_group_cache, key.objectid, | |
2576 | (unsigned long)cache); | |
2577 | } | |
2578 | btrfs_free_path(path); | |
2579 | set_size: | |
2580 | btrfs_set_super_total_bytes(&info->super_copy, new_size); | |
2581 | return 0; | |
2582 | } | |
2583 | ||
9078a3e1 CM |
2584 | int btrfs_read_block_groups(struct btrfs_root *root) |
2585 | { | |
2586 | struct btrfs_path *path; | |
2587 | int ret; | |
2588 | int err = 0; | |
96b5179d | 2589 | int bit; |
9078a3e1 | 2590 | struct btrfs_block_group_cache *cache; |
be744175 | 2591 | struct btrfs_fs_info *info = root->fs_info; |
96b5179d | 2592 | struct extent_map_tree *block_group_cache; |
9078a3e1 CM |
2593 | struct btrfs_key key; |
2594 | struct btrfs_key found_key; | |
5f39d397 | 2595 | struct extent_buffer *leaf; |
96b5179d CM |
2596 | |
2597 | block_group_cache = &info->block_group_cache; | |
9078a3e1 | 2598 | |
be744175 | 2599 | root = info->extent_root; |
9078a3e1 | 2600 | key.objectid = 0; |
db94535d | 2601 | key.offset = BTRFS_BLOCK_GROUP_SIZE; |
9078a3e1 CM |
2602 | btrfs_set_key_type(&key, BTRFS_BLOCK_GROUP_ITEM_KEY); |
2603 | ||
2604 | path = btrfs_alloc_path(); | |
2605 | if (!path) | |
2606 | return -ENOMEM; | |
2607 | ||
2608 | while(1) { | |
be744175 | 2609 | ret = btrfs_search_slot(NULL, info->extent_root, |
9078a3e1 CM |
2610 | &key, path, 0, 0); |
2611 | if (ret != 0) { | |
2612 | err = ret; | |
2613 | break; | |
2614 | } | |
5f39d397 CM |
2615 | leaf = path->nodes[0]; |
2616 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); | |
9078a3e1 CM |
2617 | cache = kmalloc(sizeof(*cache), GFP_NOFS); |
2618 | if (!cache) { | |
2619 | err = -1; | |
2620 | break; | |
2621 | } | |
3e1ad54f | 2622 | |
5f39d397 CM |
2623 | read_extent_buffer(leaf, &cache->item, |
2624 | btrfs_item_ptr_offset(leaf, path->slots[0]), | |
2625 | sizeof(cache->item)); | |
9078a3e1 | 2626 | memcpy(&cache->key, &found_key, sizeof(found_key)); |
e37c9e69 | 2627 | cache->cached = 0; |
324ae4df | 2628 | cache->pinned = 0; |
9078a3e1 CM |
2629 | key.objectid = found_key.objectid + found_key.offset; |
2630 | btrfs_release_path(root, path); | |
5f39d397 | 2631 | |
f84a8b36 CM |
2632 | if (cache->item.flags & BTRFS_BLOCK_GROUP_MIXED) { |
2633 | bit = BLOCK_GROUP_DATA | BLOCK_GROUP_METADATA; | |
2634 | cache->data = BTRFS_BLOCK_GROUP_MIXED; | |
2635 | } else if (cache->item.flags & BTRFS_BLOCK_GROUP_DATA) { | |
96b5179d | 2636 | bit = BLOCK_GROUP_DATA; |
f84a8b36 | 2637 | cache->data = BTRFS_BLOCK_GROUP_DATA; |
96b5179d CM |
2638 | } else { |
2639 | bit = BLOCK_GROUP_METADATA; | |
2640 | cache->data = 0; | |
31f3c99b | 2641 | } |
96b5179d CM |
2642 | |
2643 | /* use EXTENT_LOCKED to prevent merging */ | |
2644 | set_extent_bits(block_group_cache, found_key.objectid, | |
2645 | found_key.objectid + found_key.offset - 1, | |
2646 | bit | EXTENT_LOCKED, GFP_NOFS); | |
2647 | set_state_private(block_group_cache, found_key.objectid, | |
ae2f5411 | 2648 | (unsigned long)cache); |
96b5179d | 2649 | |
9078a3e1 | 2650 | if (key.objectid >= |
db94535d | 2651 | btrfs_super_total_bytes(&info->super_copy)) |
9078a3e1 CM |
2652 | break; |
2653 | } | |
2654 | ||
2655 | btrfs_free_path(path); | |
2656 | return 0; | |
2657 | } |