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 | */ | |
ec6b910f | 18 | #include <linux/sched.h> |
edbd8d4e | 19 | #include <linux/pagemap.h> |
ec44a35c | 20 | #include <linux/writeback.h> |
74493f7a | 21 | #include "hash.h" |
a5eb62e3 | 22 | #include "crc32c.h" |
fec577fb CM |
23 | #include "ctree.h" |
24 | #include "disk-io.h" | |
25 | #include "print-tree.h" | |
e089f05c | 26 | #include "transaction.h" |
0b86a832 | 27 | #include "volumes.h" |
925baedd | 28 | #include "locking.h" |
31153d81 | 29 | #include "ref-cache.h" |
fec577fb | 30 | |
0b86a832 | 31 | #define BLOCK_GROUP_DATA EXTENT_WRITEBACK |
96b5179d | 32 | #define BLOCK_GROUP_METADATA EXTENT_UPTODATE |
0b86a832 CM |
33 | #define BLOCK_GROUP_SYSTEM EXTENT_NEW |
34 | ||
96b5179d CM |
35 | #define BLOCK_GROUP_DIRTY EXTENT_DIRTY |
36 | ||
e089f05c CM |
37 | static int finish_current_insert(struct btrfs_trans_handle *trans, struct |
38 | btrfs_root *extent_root); | |
e20d96d6 CM |
39 | static int del_pending_extents(struct btrfs_trans_handle *trans, struct |
40 | btrfs_root *extent_root); | |
925baedd CM |
41 | static struct btrfs_block_group_cache * |
42 | __btrfs_find_block_group(struct btrfs_root *root, | |
43 | struct btrfs_block_group_cache *hint, | |
44 | u64 search_start, int data, int owner); | |
d548ee51 | 45 | |
925baedd CM |
46 | void maybe_lock_mutex(struct btrfs_root *root) |
47 | { | |
48 | if (root != root->fs_info->extent_root && | |
49 | root != root->fs_info->chunk_root && | |
50 | root != root->fs_info->dev_root) { | |
51 | mutex_lock(&root->fs_info->alloc_mutex); | |
52 | } | |
53 | } | |
54 | ||
55 | void maybe_unlock_mutex(struct btrfs_root *root) | |
56 | { | |
57 | if (root != root->fs_info->extent_root && | |
58 | root != root->fs_info->chunk_root && | |
59 | root != root->fs_info->dev_root) { | |
60 | mutex_unlock(&root->fs_info->alloc_mutex); | |
61 | } | |
62 | } | |
fec577fb | 63 | |
e37c9e69 CM |
64 | static int cache_block_group(struct btrfs_root *root, |
65 | struct btrfs_block_group_cache *block_group) | |
66 | { | |
67 | struct btrfs_path *path; | |
68 | int ret; | |
69 | struct btrfs_key key; | |
5f39d397 | 70 | struct extent_buffer *leaf; |
d1310b2e | 71 | struct extent_io_tree *free_space_cache; |
e37c9e69 | 72 | int slot; |
e37c9e69 CM |
73 | u64 last = 0; |
74 | u64 hole_size; | |
7d7d6068 | 75 | u64 first_free; |
e37c9e69 CM |
76 | int found = 0; |
77 | ||
00f5c795 CM |
78 | if (!block_group) |
79 | return 0; | |
80 | ||
e37c9e69 | 81 | root = root->fs_info->extent_root; |
f510cfec | 82 | free_space_cache = &root->fs_info->free_space_cache; |
e37c9e69 CM |
83 | |
84 | if (block_group->cached) | |
85 | return 0; | |
f510cfec | 86 | |
e37c9e69 CM |
87 | path = btrfs_alloc_path(); |
88 | if (!path) | |
89 | return -ENOMEM; | |
7d7d6068 | 90 | |
2cc58cf2 | 91 | path->reada = 2; |
5cd57b2c CM |
92 | /* |
93 | * we get into deadlocks with paths held by callers of this function. | |
94 | * since the alloc_mutex is protecting things right now, just | |
95 | * skip the locking here | |
96 | */ | |
97 | path->skip_locking = 1; | |
7d7d6068 | 98 | first_free = block_group->key.objectid; |
e37c9e69 | 99 | key.objectid = block_group->key.objectid; |
e37c9e69 CM |
100 | key.offset = 0; |
101 | btrfs_set_key_type(&key, BTRFS_EXTENT_ITEM_KEY); | |
102 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); | |
103 | if (ret < 0) | |
104 | return ret; | |
0b86a832 | 105 | ret = btrfs_previous_item(root, path, 0, BTRFS_EXTENT_ITEM_KEY); |
d548ee51 Y |
106 | if (ret < 0) |
107 | return ret; | |
108 | if (ret == 0) { | |
109 | leaf = path->nodes[0]; | |
110 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); | |
111 | if (key.objectid + key.offset > first_free) | |
112 | first_free = key.objectid + key.offset; | |
113 | } | |
e37c9e69 | 114 | while(1) { |
5f39d397 | 115 | leaf = path->nodes[0]; |
e37c9e69 | 116 | slot = path->slots[0]; |
5f39d397 | 117 | if (slot >= btrfs_header_nritems(leaf)) { |
e37c9e69 | 118 | ret = btrfs_next_leaf(root, path); |
54aa1f4d CM |
119 | if (ret < 0) |
120 | goto err; | |
de428b63 | 121 | if (ret == 0) { |
e37c9e69 | 122 | continue; |
de428b63 | 123 | } else { |
e37c9e69 CM |
124 | break; |
125 | } | |
126 | } | |
5f39d397 | 127 | btrfs_item_key_to_cpu(leaf, &key, slot); |
7d7d6068 | 128 | if (key.objectid < block_group->key.objectid) { |
7d7d6068 Y |
129 | goto next; |
130 | } | |
e37c9e69 CM |
131 | if (key.objectid >= block_group->key.objectid + |
132 | block_group->key.offset) { | |
e37c9e69 CM |
133 | break; |
134 | } | |
7d7d6068 | 135 | |
e37c9e69 CM |
136 | if (btrfs_key_type(&key) == BTRFS_EXTENT_ITEM_KEY) { |
137 | if (!found) { | |
7d7d6068 | 138 | last = first_free; |
e37c9e69 | 139 | found = 1; |
e37c9e69 | 140 | } |
f510cfec CM |
141 | if (key.objectid > last) { |
142 | hole_size = key.objectid - last; | |
143 | set_extent_dirty(free_space_cache, last, | |
144 | last + hole_size - 1, | |
145 | GFP_NOFS); | |
7d7d6068 Y |
146 | } |
147 | last = key.objectid + key.offset; | |
e37c9e69 | 148 | } |
7d7d6068 | 149 | next: |
e37c9e69 CM |
150 | path->slots[0]++; |
151 | } | |
152 | ||
7d7d6068 Y |
153 | if (!found) |
154 | last = first_free; | |
155 | if (block_group->key.objectid + | |
156 | block_group->key.offset > last) { | |
157 | hole_size = block_group->key.objectid + | |
158 | block_group->key.offset - last; | |
f510cfec CM |
159 | set_extent_dirty(free_space_cache, last, |
160 | last + hole_size - 1, GFP_NOFS); | |
7d7d6068 | 161 | } |
e37c9e69 | 162 | block_group->cached = 1; |
54aa1f4d | 163 | err: |
e37c9e69 CM |
164 | btrfs_free_path(path); |
165 | return 0; | |
166 | } | |
167 | ||
0ef3e66b CM |
168 | struct btrfs_block_group_cache *btrfs_lookup_first_block_group(struct |
169 | btrfs_fs_info *info, | |
170 | u64 bytenr) | |
171 | { | |
172 | struct extent_io_tree *block_group_cache; | |
173 | struct btrfs_block_group_cache *block_group = NULL; | |
174 | u64 ptr; | |
175 | u64 start; | |
176 | u64 end; | |
177 | int ret; | |
178 | ||
179 | bytenr = max_t(u64, bytenr, | |
180 | BTRFS_SUPER_INFO_OFFSET + BTRFS_SUPER_INFO_SIZE); | |
181 | block_group_cache = &info->block_group_cache; | |
182 | ret = find_first_extent_bit(block_group_cache, | |
183 | bytenr, &start, &end, | |
184 | BLOCK_GROUP_DATA | BLOCK_GROUP_METADATA | | |
185 | BLOCK_GROUP_SYSTEM); | |
186 | if (ret) { | |
187 | return NULL; | |
188 | } | |
189 | ret = get_state_private(block_group_cache, start, &ptr); | |
190 | if (ret) | |
191 | return NULL; | |
192 | ||
193 | block_group = (struct btrfs_block_group_cache *)(unsigned long)ptr; | |
194 | return block_group; | |
195 | } | |
196 | ||
5276aeda CM |
197 | struct btrfs_block_group_cache *btrfs_lookup_block_group(struct |
198 | btrfs_fs_info *info, | |
db94535d | 199 | u64 bytenr) |
be744175 | 200 | { |
d1310b2e | 201 | struct extent_io_tree *block_group_cache; |
96b5179d CM |
202 | struct btrfs_block_group_cache *block_group = NULL; |
203 | u64 ptr; | |
204 | u64 start; | |
205 | u64 end; | |
be744175 CM |
206 | int ret; |
207 | ||
a061fc8d CM |
208 | bytenr = max_t(u64, bytenr, |
209 | BTRFS_SUPER_INFO_OFFSET + BTRFS_SUPER_INFO_SIZE); | |
96b5179d CM |
210 | block_group_cache = &info->block_group_cache; |
211 | ret = find_first_extent_bit(block_group_cache, | |
db94535d | 212 | bytenr, &start, &end, |
0b86a832 CM |
213 | BLOCK_GROUP_DATA | BLOCK_GROUP_METADATA | |
214 | BLOCK_GROUP_SYSTEM); | |
be744175 | 215 | if (ret) { |
96b5179d | 216 | return NULL; |
be744175 | 217 | } |
96b5179d CM |
218 | ret = get_state_private(block_group_cache, start, &ptr); |
219 | if (ret) | |
220 | return NULL; | |
221 | ||
ae2f5411 | 222 | block_group = (struct btrfs_block_group_cache *)(unsigned long)ptr; |
5cf66426 | 223 | if (block_group->key.objectid <= bytenr && bytenr < |
96b5179d CM |
224 | block_group->key.objectid + block_group->key.offset) |
225 | return block_group; | |
be744175 CM |
226 | return NULL; |
227 | } | |
0b86a832 CM |
228 | |
229 | static int block_group_bits(struct btrfs_block_group_cache *cache, u64 bits) | |
230 | { | |
593060d7 | 231 | return (cache->flags & bits) == bits; |
0b86a832 CM |
232 | } |
233 | ||
234 | static int noinline find_search_start(struct btrfs_root *root, | |
98ed5174 | 235 | struct btrfs_block_group_cache **cache_ret, |
0ef3e66b | 236 | u64 *start_ret, u64 num, int data) |
e37c9e69 | 237 | { |
e37c9e69 CM |
238 | int ret; |
239 | struct btrfs_block_group_cache *cache = *cache_ret; | |
d7fc640e | 240 | struct extent_io_tree *free_space_cache; |
7d1660d4 | 241 | struct extent_state *state; |
e19caa5f | 242 | u64 last; |
f510cfec | 243 | u64 start = 0; |
257d0ce3 | 244 | u64 cache_miss = 0; |
c31f8830 | 245 | u64 total_fs_bytes; |
0b86a832 | 246 | u64 search_start = *start_ret; |
f84a8b36 | 247 | int wrapped = 0; |
e37c9e69 | 248 | |
7d9eb12c | 249 | WARN_ON(!mutex_is_locked(&root->fs_info->alloc_mutex)); |
c31f8830 | 250 | total_fs_bytes = btrfs_super_total_bytes(&root->fs_info->super_copy); |
d7fc640e CM |
251 | free_space_cache = &root->fs_info->free_space_cache; |
252 | ||
0ef3e66b CM |
253 | if (!cache) |
254 | goto out; | |
255 | ||
e37c9e69 | 256 | again: |
54aa1f4d | 257 | ret = cache_block_group(root, cache); |
0ef3e66b | 258 | if (ret) { |
54aa1f4d | 259 | goto out; |
0ef3e66b | 260 | } |
f84a8b36 | 261 | |
e19caa5f | 262 | last = max(search_start, cache->key.objectid); |
0ef3e66b | 263 | if (!block_group_bits(cache, data) || cache->ro) |
0b86a832 | 264 | goto new_group; |
e19caa5f | 265 | |
7d1660d4 CM |
266 | spin_lock_irq(&free_space_cache->lock); |
267 | state = find_first_extent_bit_state(free_space_cache, last, EXTENT_DIRTY); | |
e37c9e69 | 268 | while(1) { |
7d1660d4 | 269 | if (!state) { |
257d0ce3 CM |
270 | if (!cache_miss) |
271 | cache_miss = last; | |
7d1660d4 | 272 | spin_unlock_irq(&free_space_cache->lock); |
e19caa5f CM |
273 | goto new_group; |
274 | } | |
f510cfec | 275 | |
7d1660d4 CM |
276 | start = max(last, state->start); |
277 | last = state->end + 1; | |
257d0ce3 | 278 | if (last - start < num) { |
7d1660d4 CM |
279 | do { |
280 | state = extent_state_next(state); | |
281 | } while(state && !(state->state & EXTENT_DIRTY)); | |
f510cfec | 282 | continue; |
257d0ce3 | 283 | } |
7d1660d4 | 284 | spin_unlock_irq(&free_space_cache->lock); |
0ef3e66b | 285 | if (cache->ro) { |
8f18cf13 | 286 | goto new_group; |
0ef3e66b | 287 | } |
0b86a832 | 288 | if (start + num > cache->key.objectid + cache->key.offset) |
e37c9e69 | 289 | goto new_group; |
8790d502 | 290 | if (!block_group_bits(cache, data)) { |
611f0e00 | 291 | printk("block group bits don't match %Lu %d\n", cache->flags, data); |
8790d502 | 292 | } |
0b86a832 CM |
293 | *start_ret = start; |
294 | return 0; | |
8790d502 CM |
295 | } |
296 | out: | |
1a2b2ac7 CM |
297 | cache = btrfs_lookup_block_group(root->fs_info, search_start); |
298 | if (!cache) { | |
0b86a832 | 299 | printk("Unable to find block group for %Lu\n", search_start); |
1a2b2ac7 | 300 | WARN_ON(1); |
1a2b2ac7 | 301 | } |
0b86a832 | 302 | return -ENOSPC; |
e37c9e69 CM |
303 | |
304 | new_group: | |
e19caa5f | 305 | last = cache->key.objectid + cache->key.offset; |
f84a8b36 | 306 | wrapped: |
0ef3e66b | 307 | cache = btrfs_lookup_first_block_group(root->fs_info, last); |
c31f8830 | 308 | if (!cache || cache->key.objectid >= total_fs_bytes) { |
0e4de584 | 309 | no_cache: |
f84a8b36 CM |
310 | if (!wrapped) { |
311 | wrapped = 1; | |
312 | last = search_start; | |
f84a8b36 CM |
313 | goto wrapped; |
314 | } | |
1a2b2ac7 | 315 | goto out; |
e37c9e69 | 316 | } |
257d0ce3 CM |
317 | if (cache_miss && !cache->cached) { |
318 | cache_block_group(root, cache); | |
319 | last = cache_miss; | |
0ef3e66b | 320 | cache = btrfs_lookup_first_block_group(root->fs_info, last); |
257d0ce3 | 321 | } |
0ef3e66b | 322 | cache_miss = 0; |
c286ac48 | 323 | cache = btrfs_find_block_group(root, cache, last, data, 0); |
0e4de584 CM |
324 | if (!cache) |
325 | goto no_cache; | |
e37c9e69 CM |
326 | *cache_ret = cache; |
327 | goto again; | |
328 | } | |
329 | ||
84f54cfa CM |
330 | static u64 div_factor(u64 num, int factor) |
331 | { | |
257d0ce3 CM |
332 | if (factor == 10) |
333 | return num; | |
84f54cfa CM |
334 | num *= factor; |
335 | do_div(num, 10); | |
336 | return num; | |
337 | } | |
338 | ||
6324fbf3 CM |
339 | static int block_group_state_bits(u64 flags) |
340 | { | |
341 | int bits = 0; | |
342 | if (flags & BTRFS_BLOCK_GROUP_DATA) | |
343 | bits |= BLOCK_GROUP_DATA; | |
344 | if (flags & BTRFS_BLOCK_GROUP_METADATA) | |
345 | bits |= BLOCK_GROUP_METADATA; | |
346 | if (flags & BTRFS_BLOCK_GROUP_SYSTEM) | |
347 | bits |= BLOCK_GROUP_SYSTEM; | |
348 | return bits; | |
349 | } | |
350 | ||
925baedd CM |
351 | static struct btrfs_block_group_cache * |
352 | __btrfs_find_block_group(struct btrfs_root *root, | |
353 | struct btrfs_block_group_cache *hint, | |
354 | u64 search_start, int data, int owner) | |
cd1bc465 | 355 | { |
96b5179d | 356 | struct btrfs_block_group_cache *cache; |
d1310b2e | 357 | struct extent_io_tree *block_group_cache; |
31f3c99b | 358 | struct btrfs_block_group_cache *found_group = NULL; |
cd1bc465 CM |
359 | struct btrfs_fs_info *info = root->fs_info; |
360 | u64 used; | |
31f3c99b | 361 | u64 last = 0; |
96b5179d CM |
362 | u64 start; |
363 | u64 end; | |
364 | u64 free_check; | |
365 | u64 ptr; | |
366 | int bit; | |
cd1bc465 | 367 | int ret; |
31f3c99b | 368 | int full_search = 0; |
bce4eae9 | 369 | int factor = 10; |
0ef3e66b | 370 | int wrapped = 0; |
de428b63 | 371 | |
96b5179d CM |
372 | block_group_cache = &info->block_group_cache; |
373 | ||
a236aed1 CM |
374 | if (data & BTRFS_BLOCK_GROUP_METADATA) |
375 | factor = 9; | |
be744175 | 376 | |
6324fbf3 | 377 | bit = block_group_state_bits(data); |
be744175 | 378 | |
0ef3e66b | 379 | if (search_start) { |
be744175 | 380 | struct btrfs_block_group_cache *shint; |
0ef3e66b | 381 | shint = btrfs_lookup_first_block_group(info, search_start); |
8f18cf13 | 382 | if (shint && block_group_bits(shint, data) && !shint->ro) { |
c286ac48 | 383 | spin_lock(&shint->lock); |
be744175 | 384 | used = btrfs_block_group_used(&shint->item); |
324ae4df Y |
385 | if (used + shint->pinned < |
386 | div_factor(shint->key.offset, factor)) { | |
c286ac48 | 387 | spin_unlock(&shint->lock); |
be744175 CM |
388 | return shint; |
389 | } | |
c286ac48 | 390 | spin_unlock(&shint->lock); |
be744175 CM |
391 | } |
392 | } | |
0ef3e66b | 393 | if (hint && !hint->ro && block_group_bits(hint, data)) { |
c286ac48 | 394 | spin_lock(&hint->lock); |
31f3c99b | 395 | used = btrfs_block_group_used(&hint->item); |
324ae4df Y |
396 | if (used + hint->pinned < |
397 | div_factor(hint->key.offset, factor)) { | |
c286ac48 | 398 | spin_unlock(&hint->lock); |
31f3c99b CM |
399 | return hint; |
400 | } | |
c286ac48 | 401 | spin_unlock(&hint->lock); |
e19caa5f | 402 | last = hint->key.objectid + hint->key.offset; |
31f3c99b | 403 | } else { |
e37c9e69 | 404 | if (hint) |
0ef3e66b | 405 | last = max(hint->key.objectid, search_start); |
e37c9e69 | 406 | else |
0ef3e66b | 407 | last = search_start; |
31f3c99b | 408 | } |
31f3c99b | 409 | again: |
cd1bc465 | 410 | while(1) { |
96b5179d CM |
411 | ret = find_first_extent_bit(block_group_cache, last, |
412 | &start, &end, bit); | |
413 | if (ret) | |
cd1bc465 | 414 | break; |
96b5179d CM |
415 | |
416 | ret = get_state_private(block_group_cache, start, &ptr); | |
0ef3e66b CM |
417 | if (ret) { |
418 | last = end + 1; | |
419 | continue; | |
420 | } | |
96b5179d | 421 | |
ae2f5411 | 422 | cache = (struct btrfs_block_group_cache *)(unsigned long)ptr; |
c286ac48 | 423 | spin_lock(&cache->lock); |
96b5179d CM |
424 | last = cache->key.objectid + cache->key.offset; |
425 | used = btrfs_block_group_used(&cache->item); | |
426 | ||
8f18cf13 | 427 | if (!cache->ro && block_group_bits(cache, data)) { |
0ef3e66b | 428 | free_check = div_factor(cache->key.offset, factor); |
8790d502 CM |
429 | if (used + cache->pinned < free_check) { |
430 | found_group = cache; | |
c286ac48 | 431 | spin_unlock(&cache->lock); |
8790d502 CM |
432 | goto found; |
433 | } | |
6324fbf3 | 434 | } |
c286ac48 | 435 | spin_unlock(&cache->lock); |
de428b63 | 436 | cond_resched(); |
cd1bc465 | 437 | } |
0ef3e66b CM |
438 | if (!wrapped) { |
439 | last = search_start; | |
440 | wrapped = 1; | |
441 | goto again; | |
442 | } | |
443 | if (!full_search && factor < 10) { | |
be744175 | 444 | last = search_start; |
31f3c99b | 445 | full_search = 1; |
0ef3e66b | 446 | factor = 10; |
31f3c99b CM |
447 | goto again; |
448 | } | |
be744175 | 449 | found: |
31f3c99b | 450 | return found_group; |
cd1bc465 CM |
451 | } |
452 | ||
925baedd CM |
453 | struct btrfs_block_group_cache *btrfs_find_block_group(struct btrfs_root *root, |
454 | struct btrfs_block_group_cache | |
455 | *hint, u64 search_start, | |
456 | int data, int owner) | |
457 | { | |
458 | ||
459 | struct btrfs_block_group_cache *ret; | |
925baedd | 460 | ret = __btrfs_find_block_group(root, hint, search_start, data, owner); |
925baedd CM |
461 | return ret; |
462 | } | |
7bb86316 | 463 | static u64 hash_extent_ref(u64 root_objectid, u64 ref_generation, |
74493f7a CM |
464 | u64 owner, u64 owner_offset) |
465 | { | |
466 | u32 high_crc = ~(u32)0; | |
467 | u32 low_crc = ~(u32)0; | |
468 | __le64 lenum; | |
74493f7a | 469 | lenum = cpu_to_le64(root_objectid); |
a5eb62e3 | 470 | high_crc = btrfs_crc32c(high_crc, &lenum, sizeof(lenum)); |
7bb86316 | 471 | lenum = cpu_to_le64(ref_generation); |
a5eb62e3 | 472 | low_crc = btrfs_crc32c(low_crc, &lenum, sizeof(lenum)); |
21a4989d CM |
473 | if (owner >= BTRFS_FIRST_FREE_OBJECTID) { |
474 | lenum = cpu_to_le64(owner); | |
a5eb62e3 | 475 | low_crc = btrfs_crc32c(low_crc, &lenum, sizeof(lenum)); |
21a4989d | 476 | lenum = cpu_to_le64(owner_offset); |
a5eb62e3 | 477 | low_crc = btrfs_crc32c(low_crc, &lenum, sizeof(lenum)); |
21a4989d | 478 | } |
74493f7a CM |
479 | return ((u64)high_crc << 32) | (u64)low_crc; |
480 | } | |
481 | ||
7bb86316 CM |
482 | static int match_extent_ref(struct extent_buffer *leaf, |
483 | struct btrfs_extent_ref *disk_ref, | |
484 | struct btrfs_extent_ref *cpu_ref) | |
485 | { | |
486 | int ret; | |
487 | int len; | |
488 | ||
489 | if (cpu_ref->objectid) | |
490 | len = sizeof(*cpu_ref); | |
491 | else | |
492 | len = 2 * sizeof(u64); | |
493 | ret = memcmp_extent_buffer(leaf, cpu_ref, (unsigned long)disk_ref, | |
494 | len); | |
495 | return ret == 0; | |
496 | } | |
497 | ||
98ed5174 CM |
498 | static int noinline lookup_extent_backref(struct btrfs_trans_handle *trans, |
499 | struct btrfs_root *root, | |
500 | struct btrfs_path *path, u64 bytenr, | |
501 | u64 root_objectid, | |
502 | u64 ref_generation, u64 owner, | |
503 | u64 owner_offset, int del) | |
74493f7a CM |
504 | { |
505 | u64 hash; | |
506 | struct btrfs_key key; | |
7bb86316 | 507 | struct btrfs_key found_key; |
74493f7a | 508 | struct btrfs_extent_ref ref; |
7bb86316 CM |
509 | struct extent_buffer *leaf; |
510 | struct btrfs_extent_ref *disk_ref; | |
511 | int ret; | |
512 | int ret2; | |
513 | ||
514 | btrfs_set_stack_ref_root(&ref, root_objectid); | |
515 | btrfs_set_stack_ref_generation(&ref, ref_generation); | |
516 | btrfs_set_stack_ref_objectid(&ref, owner); | |
517 | btrfs_set_stack_ref_offset(&ref, owner_offset); | |
518 | ||
519 | hash = hash_extent_ref(root_objectid, ref_generation, owner, | |
520 | owner_offset); | |
521 | key.offset = hash; | |
522 | key.objectid = bytenr; | |
523 | key.type = BTRFS_EXTENT_REF_KEY; | |
524 | ||
525 | while (1) { | |
526 | ret = btrfs_search_slot(trans, root, &key, path, | |
527 | del ? -1 : 0, del); | |
528 | if (ret < 0) | |
529 | goto out; | |
530 | leaf = path->nodes[0]; | |
531 | if (ret != 0) { | |
532 | u32 nritems = btrfs_header_nritems(leaf); | |
533 | if (path->slots[0] >= nritems) { | |
534 | ret2 = btrfs_next_leaf(root, path); | |
535 | if (ret2) | |
536 | goto out; | |
537 | leaf = path->nodes[0]; | |
538 | } | |
539 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); | |
540 | if (found_key.objectid != bytenr || | |
541 | found_key.type != BTRFS_EXTENT_REF_KEY) | |
542 | goto out; | |
543 | key.offset = found_key.offset; | |
544 | if (del) { | |
545 | btrfs_release_path(root, path); | |
546 | continue; | |
547 | } | |
548 | } | |
549 | disk_ref = btrfs_item_ptr(path->nodes[0], | |
550 | path->slots[0], | |
551 | struct btrfs_extent_ref); | |
552 | if (match_extent_ref(path->nodes[0], disk_ref, &ref)) { | |
553 | ret = 0; | |
554 | goto out; | |
555 | } | |
556 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); | |
557 | key.offset = found_key.offset + 1; | |
558 | btrfs_release_path(root, path); | |
559 | } | |
560 | out: | |
561 | return ret; | |
562 | } | |
563 | ||
d8d5f3e1 CM |
564 | /* |
565 | * Back reference rules. Back refs have three main goals: | |
566 | * | |
567 | * 1) differentiate between all holders of references to an extent so that | |
568 | * when a reference is dropped we can make sure it was a valid reference | |
569 | * before freeing the extent. | |
570 | * | |
571 | * 2) Provide enough information to quickly find the holders of an extent | |
572 | * if we notice a given block is corrupted or bad. | |
573 | * | |
574 | * 3) Make it easy to migrate blocks for FS shrinking or storage pool | |
575 | * maintenance. This is actually the same as #2, but with a slightly | |
576 | * different use case. | |
577 | * | |
578 | * File extents can be referenced by: | |
579 | * | |
580 | * - multiple snapshots, subvolumes, or different generations in one subvol | |
581 | * - different files inside a single subvolume (in theory, not implemented yet) | |
582 | * - different offsets inside a file (bookend extents in file.c) | |
583 | * | |
584 | * The extent ref structure has fields for: | |
585 | * | |
586 | * - Objectid of the subvolume root | |
587 | * - Generation number of the tree holding the reference | |
588 | * - objectid of the file holding the reference | |
589 | * - offset in the file corresponding to the key holding the reference | |
590 | * | |
591 | * When a file extent is allocated the fields are filled in: | |
592 | * (root_key.objectid, trans->transid, inode objectid, offset in file) | |
593 | * | |
594 | * When a leaf is cow'd new references are added for every file extent found | |
595 | * in the leaf. It looks the same as the create case, but trans->transid | |
596 | * will be different when the block is cow'd. | |
597 | * | |
598 | * (root_key.objectid, trans->transid, inode objectid, offset in file) | |
599 | * | |
600 | * When a file extent is removed either during snapshot deletion or file | |
601 | * truncation, the corresponding back reference is found | |
602 | * by searching for: | |
603 | * | |
604 | * (btrfs_header_owner(leaf), btrfs_header_generation(leaf), | |
605 | * inode objectid, offset in file) | |
606 | * | |
607 | * Btree extents can be referenced by: | |
608 | * | |
609 | * - Different subvolumes | |
610 | * - Different generations of the same subvolume | |
611 | * | |
612 | * Storing sufficient information for a full reverse mapping of a btree | |
613 | * block would require storing the lowest key of the block in the backref, | |
614 | * and it would require updating that lowest key either before write out or | |
615 | * every time it changed. Instead, the objectid of the lowest key is stored | |
616 | * along with the level of the tree block. This provides a hint | |
617 | * about where in the btree the block can be found. Searches through the | |
618 | * btree only need to look for a pointer to that block, so they stop one | |
619 | * level higher than the level recorded in the backref. | |
620 | * | |
621 | * Some btrees do not do reference counting on their extents. These | |
622 | * include the extent tree and the tree of tree roots. Backrefs for these | |
623 | * trees always have a generation of zero. | |
624 | * | |
625 | * When a tree block is created, back references are inserted: | |
626 | * | |
f6dbff55 | 627 | * (root->root_key.objectid, trans->transid or zero, level, lowest_key_objectid) |
d8d5f3e1 CM |
628 | * |
629 | * When a tree block is cow'd in a reference counted root, | |
630 | * new back references are added for all the blocks it points to. | |
631 | * These are of the form (trans->transid will have increased since creation): | |
632 | * | |
f6dbff55 | 633 | * (root->root_key.objectid, trans->transid, level, lowest_key_objectid) |
d8d5f3e1 CM |
634 | * |
635 | * Because the lowest_key_objectid and the level are just hints | |
636 | * they are not used when backrefs are deleted. When a backref is deleted: | |
637 | * | |
638 | * if backref was for a tree root: | |
639 | * root_objectid = root->root_key.objectid | |
640 | * else | |
641 | * root_objectid = btrfs_header_owner(parent) | |
642 | * | |
643 | * (root_objectid, btrfs_header_generation(parent) or zero, 0, 0) | |
644 | * | |
645 | * Back Reference Key hashing: | |
646 | * | |
647 | * Back references have four fields, each 64 bits long. Unfortunately, | |
648 | * This is hashed into a single 64 bit number and placed into the key offset. | |
649 | * The key objectid corresponds to the first byte in the extent, and the | |
650 | * key type is set to BTRFS_EXTENT_REF_KEY | |
651 | */ | |
7bb86316 CM |
652 | int btrfs_insert_extent_backref(struct btrfs_trans_handle *trans, |
653 | struct btrfs_root *root, | |
654 | struct btrfs_path *path, u64 bytenr, | |
655 | u64 root_objectid, u64 ref_generation, | |
656 | u64 owner, u64 owner_offset) | |
657 | { | |
658 | u64 hash; | |
659 | struct btrfs_key key; | |
660 | struct btrfs_extent_ref ref; | |
661 | struct btrfs_extent_ref *disk_ref; | |
74493f7a CM |
662 | int ret; |
663 | ||
664 | btrfs_set_stack_ref_root(&ref, root_objectid); | |
7bb86316 | 665 | btrfs_set_stack_ref_generation(&ref, ref_generation); |
74493f7a CM |
666 | btrfs_set_stack_ref_objectid(&ref, owner); |
667 | btrfs_set_stack_ref_offset(&ref, owner_offset); | |
668 | ||
7bb86316 CM |
669 | hash = hash_extent_ref(root_objectid, ref_generation, owner, |
670 | owner_offset); | |
74493f7a CM |
671 | key.offset = hash; |
672 | key.objectid = bytenr; | |
673 | key.type = BTRFS_EXTENT_REF_KEY; | |
674 | ||
675 | ret = btrfs_insert_empty_item(trans, root, path, &key, sizeof(ref)); | |
676 | while (ret == -EEXIST) { | |
7bb86316 CM |
677 | disk_ref = btrfs_item_ptr(path->nodes[0], path->slots[0], |
678 | struct btrfs_extent_ref); | |
679 | if (match_extent_ref(path->nodes[0], disk_ref, &ref)) | |
680 | goto out; | |
681 | key.offset++; | |
682 | btrfs_release_path(root, path); | |
683 | ret = btrfs_insert_empty_item(trans, root, path, &key, | |
684 | sizeof(ref)); | |
74493f7a | 685 | } |
7bb86316 CM |
686 | if (ret) |
687 | goto out; | |
688 | disk_ref = btrfs_item_ptr(path->nodes[0], path->slots[0], | |
689 | struct btrfs_extent_ref); | |
690 | write_extent_buffer(path->nodes[0], &ref, (unsigned long)disk_ref, | |
691 | sizeof(ref)); | |
692 | btrfs_mark_buffer_dirty(path->nodes[0]); | |
693 | out: | |
694 | btrfs_release_path(root, path); | |
695 | return ret; | |
74493f7a CM |
696 | } |
697 | ||
925baedd | 698 | static int __btrfs_inc_extent_ref(struct btrfs_trans_handle *trans, |
b18c6685 | 699 | struct btrfs_root *root, |
74493f7a | 700 | u64 bytenr, u64 num_bytes, |
7bb86316 | 701 | u64 root_objectid, u64 ref_generation, |
74493f7a | 702 | u64 owner, u64 owner_offset) |
02217ed2 | 703 | { |
5caf2a00 | 704 | struct btrfs_path *path; |
02217ed2 | 705 | int ret; |
e2fa7227 | 706 | struct btrfs_key key; |
5f39d397 | 707 | struct extent_buffer *l; |
234b63a0 | 708 | struct btrfs_extent_item *item; |
cf27e1ee | 709 | u32 refs; |
037e6390 | 710 | |
db94535d | 711 | WARN_ON(num_bytes < root->sectorsize); |
5caf2a00 | 712 | path = btrfs_alloc_path(); |
54aa1f4d CM |
713 | if (!path) |
714 | return -ENOMEM; | |
26b8003f | 715 | |
3c12ac72 | 716 | path->reada = 1; |
db94535d | 717 | key.objectid = bytenr; |
62e2749e | 718 | btrfs_set_key_type(&key, BTRFS_EXTENT_ITEM_KEY); |
db94535d | 719 | key.offset = num_bytes; |
5caf2a00 | 720 | ret = btrfs_search_slot(trans, root->fs_info->extent_root, &key, path, |
9f5fae2f | 721 | 0, 1); |
54aa1f4d CM |
722 | if (ret < 0) |
723 | return ret; | |
a429e513 | 724 | if (ret != 0) { |
a28ec197 | 725 | BUG(); |
a429e513 | 726 | } |
02217ed2 | 727 | BUG_ON(ret != 0); |
5f39d397 | 728 | l = path->nodes[0]; |
5caf2a00 | 729 | item = btrfs_item_ptr(l, path->slots[0], struct btrfs_extent_item); |
5f39d397 CM |
730 | refs = btrfs_extent_refs(l, item); |
731 | btrfs_set_extent_refs(l, item, refs + 1); | |
5caf2a00 | 732 | btrfs_mark_buffer_dirty(path->nodes[0]); |
a28ec197 | 733 | |
5caf2a00 | 734 | btrfs_release_path(root->fs_info->extent_root, path); |
7bb86316 | 735 | |
3c12ac72 | 736 | path->reada = 1; |
7bb86316 CM |
737 | ret = btrfs_insert_extent_backref(trans, root->fs_info->extent_root, |
738 | path, bytenr, root_objectid, | |
739 | ref_generation, owner, owner_offset); | |
740 | BUG_ON(ret); | |
9f5fae2f | 741 | finish_current_insert(trans, root->fs_info->extent_root); |
e20d96d6 | 742 | del_pending_extents(trans, root->fs_info->extent_root); |
74493f7a CM |
743 | |
744 | btrfs_free_path(path); | |
02217ed2 CM |
745 | return 0; |
746 | } | |
747 | ||
925baedd CM |
748 | int btrfs_inc_extent_ref(struct btrfs_trans_handle *trans, |
749 | struct btrfs_root *root, | |
750 | u64 bytenr, u64 num_bytes, | |
751 | u64 root_objectid, u64 ref_generation, | |
752 | u64 owner, u64 owner_offset) | |
753 | { | |
754 | int ret; | |
755 | ||
756 | mutex_lock(&root->fs_info->alloc_mutex); | |
757 | ret = __btrfs_inc_extent_ref(trans, root, bytenr, num_bytes, | |
758 | root_objectid, ref_generation, | |
759 | owner, owner_offset); | |
760 | mutex_unlock(&root->fs_info->alloc_mutex); | |
761 | return ret; | |
762 | } | |
763 | ||
e9d0b13b CM |
764 | int btrfs_extent_post_op(struct btrfs_trans_handle *trans, |
765 | struct btrfs_root *root) | |
766 | { | |
767 | finish_current_insert(trans, root->fs_info->extent_root); | |
768 | del_pending_extents(trans, root->fs_info->extent_root); | |
769 | return 0; | |
770 | } | |
771 | ||
b18c6685 | 772 | static int lookup_extent_ref(struct btrfs_trans_handle *trans, |
db94535d CM |
773 | struct btrfs_root *root, u64 bytenr, |
774 | u64 num_bytes, u32 *refs) | |
a28ec197 | 775 | { |
5caf2a00 | 776 | struct btrfs_path *path; |
a28ec197 | 777 | int ret; |
e2fa7227 | 778 | struct btrfs_key key; |
5f39d397 | 779 | struct extent_buffer *l; |
234b63a0 | 780 | struct btrfs_extent_item *item; |
5caf2a00 | 781 | |
db94535d | 782 | WARN_ON(num_bytes < root->sectorsize); |
5caf2a00 | 783 | path = btrfs_alloc_path(); |
3c12ac72 | 784 | path->reada = 1; |
db94535d CM |
785 | key.objectid = bytenr; |
786 | key.offset = num_bytes; | |
62e2749e | 787 | btrfs_set_key_type(&key, BTRFS_EXTENT_ITEM_KEY); |
5caf2a00 | 788 | ret = btrfs_search_slot(trans, root->fs_info->extent_root, &key, path, |
9f5fae2f | 789 | 0, 0); |
54aa1f4d CM |
790 | if (ret < 0) |
791 | goto out; | |
5f39d397 CM |
792 | if (ret != 0) { |
793 | btrfs_print_leaf(root, path->nodes[0]); | |
db94535d | 794 | printk("failed to find block number %Lu\n", bytenr); |
a28ec197 | 795 | BUG(); |
5f39d397 CM |
796 | } |
797 | l = path->nodes[0]; | |
5caf2a00 | 798 | item = btrfs_item_ptr(l, path->slots[0], struct btrfs_extent_item); |
5f39d397 | 799 | *refs = btrfs_extent_refs(l, item); |
54aa1f4d | 800 | out: |
5caf2a00 | 801 | btrfs_free_path(path); |
a28ec197 CM |
802 | return 0; |
803 | } | |
804 | ||
be20aa9d CM |
805 | u32 btrfs_count_snapshots_in_path(struct btrfs_root *root, |
806 | struct btrfs_path *count_path, | |
a68d5933 | 807 | u64 expected_owner, |
be20aa9d CM |
808 | u64 first_extent) |
809 | { | |
810 | struct btrfs_root *extent_root = root->fs_info->extent_root; | |
811 | struct btrfs_path *path; | |
812 | u64 bytenr; | |
813 | u64 found_objectid; | |
a68d5933 | 814 | u64 found_owner; |
56b453c9 | 815 | u64 root_objectid = root->root_key.objectid; |
be20aa9d | 816 | u32 total_count = 0; |
bbaf549e | 817 | u32 extent_refs; |
be20aa9d | 818 | u32 cur_count; |
be20aa9d CM |
819 | u32 nritems; |
820 | int ret; | |
821 | struct btrfs_key key; | |
822 | struct btrfs_key found_key; | |
823 | struct extent_buffer *l; | |
824 | struct btrfs_extent_item *item; | |
825 | struct btrfs_extent_ref *ref_item; | |
826 | int level = -1; | |
827 | ||
925baedd CM |
828 | /* FIXME, needs locking */ |
829 | BUG(); | |
830 | ||
831 | mutex_lock(&root->fs_info->alloc_mutex); | |
be20aa9d CM |
832 | path = btrfs_alloc_path(); |
833 | again: | |
834 | if (level == -1) | |
835 | bytenr = first_extent; | |
836 | else | |
837 | bytenr = count_path->nodes[level]->start; | |
838 | ||
839 | cur_count = 0; | |
840 | key.objectid = bytenr; | |
841 | key.offset = 0; | |
842 | ||
843 | btrfs_set_key_type(&key, BTRFS_EXTENT_ITEM_KEY); | |
844 | ret = btrfs_search_slot(NULL, extent_root, &key, path, 0, 0); | |
845 | if (ret < 0) | |
846 | goto out; | |
847 | BUG_ON(ret == 0); | |
848 | ||
849 | l = path->nodes[0]; | |
850 | btrfs_item_key_to_cpu(l, &found_key, path->slots[0]); | |
851 | ||
852 | if (found_key.objectid != bytenr || | |
853 | found_key.type != BTRFS_EXTENT_ITEM_KEY) { | |
854 | goto out; | |
855 | } | |
856 | ||
857 | item = btrfs_item_ptr(l, path->slots[0], struct btrfs_extent_item); | |
bbaf549e | 858 | extent_refs = btrfs_extent_refs(l, item); |
be20aa9d | 859 | while (1) { |
bd09835d | 860 | l = path->nodes[0]; |
be20aa9d CM |
861 | nritems = btrfs_header_nritems(l); |
862 | if (path->slots[0] >= nritems) { | |
863 | ret = btrfs_next_leaf(extent_root, path); | |
864 | if (ret == 0) | |
865 | continue; | |
866 | break; | |
867 | } | |
868 | btrfs_item_key_to_cpu(l, &found_key, path->slots[0]); | |
869 | if (found_key.objectid != bytenr) | |
870 | break; | |
bd09835d | 871 | |
be20aa9d CM |
872 | if (found_key.type != BTRFS_EXTENT_REF_KEY) { |
873 | path->slots[0]++; | |
874 | continue; | |
875 | } | |
876 | ||
877 | cur_count++; | |
878 | ref_item = btrfs_item_ptr(l, path->slots[0], | |
879 | struct btrfs_extent_ref); | |
880 | found_objectid = btrfs_ref_root(l, ref_item); | |
881 | ||
56b453c9 CM |
882 | if (found_objectid != root_objectid) { |
883 | total_count = 2; | |
4313b399 | 884 | goto out; |
56b453c9 | 885 | } |
a68d5933 CM |
886 | if (level == -1) { |
887 | found_owner = btrfs_ref_objectid(l, ref_item); | |
888 | if (found_owner != expected_owner) { | |
889 | total_count = 2; | |
890 | goto out; | |
891 | } | |
bbaf549e CM |
892 | /* |
893 | * nasty. we don't count a reference held by | |
894 | * the running transaction. This allows nodatacow | |
895 | * to avoid cow most of the time | |
896 | */ | |
897 | if (found_owner >= BTRFS_FIRST_FREE_OBJECTID && | |
898 | btrfs_ref_generation(l, ref_item) == | |
899 | root->fs_info->generation) { | |
900 | extent_refs--; | |
901 | } | |
a68d5933 | 902 | } |
56b453c9 | 903 | total_count = 1; |
be20aa9d CM |
904 | path->slots[0]++; |
905 | } | |
bbaf549e CM |
906 | /* |
907 | * if there is more than one reference against a data extent, | |
908 | * we have to assume the other ref is another snapshot | |
909 | */ | |
910 | if (level == -1 && extent_refs > 1) { | |
911 | total_count = 2; | |
912 | goto out; | |
913 | } | |
be20aa9d CM |
914 | if (cur_count == 0) { |
915 | total_count = 0; | |
916 | goto out; | |
917 | } | |
be20aa9d CM |
918 | if (level >= 0 && root->node == count_path->nodes[level]) |
919 | goto out; | |
920 | level++; | |
921 | btrfs_release_path(root, path); | |
922 | goto again; | |
923 | ||
924 | out: | |
925 | btrfs_free_path(path); | |
925baedd | 926 | mutex_unlock(&root->fs_info->alloc_mutex); |
be20aa9d | 927 | return total_count; |
be20aa9d | 928 | } |
c5739bba | 929 | |
e089f05c | 930 | int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root, |
31153d81 | 931 | struct extent_buffer *buf, int cache_ref) |
02217ed2 | 932 | { |
db94535d | 933 | u64 bytenr; |
5f39d397 CM |
934 | u32 nritems; |
935 | struct btrfs_key key; | |
6407bf6d | 936 | struct btrfs_file_extent_item *fi; |
02217ed2 | 937 | int i; |
db94535d | 938 | int level; |
6407bf6d | 939 | int ret; |
54aa1f4d | 940 | int faili; |
31153d81 | 941 | int nr_file_extents = 0; |
a28ec197 | 942 | |
3768f368 | 943 | if (!root->ref_cows) |
a28ec197 | 944 | return 0; |
5f39d397 | 945 | |
db94535d | 946 | level = btrfs_header_level(buf); |
5f39d397 CM |
947 | nritems = btrfs_header_nritems(buf); |
948 | for (i = 0; i < nritems; i++) { | |
e34a5b4f | 949 | cond_resched(); |
db94535d CM |
950 | if (level == 0) { |
951 | u64 disk_bytenr; | |
5f39d397 CM |
952 | btrfs_item_key_to_cpu(buf, &key, i); |
953 | if (btrfs_key_type(&key) != BTRFS_EXTENT_DATA_KEY) | |
6407bf6d | 954 | continue; |
5f39d397 | 955 | fi = btrfs_item_ptr(buf, i, |
6407bf6d | 956 | struct btrfs_file_extent_item); |
5f39d397 | 957 | if (btrfs_file_extent_type(buf, fi) == |
236454df CM |
958 | BTRFS_FILE_EXTENT_INLINE) |
959 | continue; | |
db94535d CM |
960 | disk_bytenr = btrfs_file_extent_disk_bytenr(buf, fi); |
961 | if (disk_bytenr == 0) | |
3a686375 | 962 | continue; |
4a096752 | 963 | |
31153d81 YZ |
964 | if (buf != root->commit_root) |
965 | nr_file_extents++; | |
966 | ||
4a096752 | 967 | mutex_lock(&root->fs_info->alloc_mutex); |
925baedd | 968 | ret = __btrfs_inc_extent_ref(trans, root, disk_bytenr, |
7bb86316 CM |
969 | btrfs_file_extent_disk_num_bytes(buf, fi), |
970 | root->root_key.objectid, trans->transid, | |
971 | key.objectid, key.offset); | |
4a096752 | 972 | mutex_unlock(&root->fs_info->alloc_mutex); |
54aa1f4d CM |
973 | if (ret) { |
974 | faili = i; | |
4a096752 | 975 | WARN_ON(1); |
54aa1f4d CM |
976 | goto fail; |
977 | } | |
6407bf6d | 978 | } else { |
db94535d | 979 | bytenr = btrfs_node_blockptr(buf, i); |
6caab489 | 980 | btrfs_node_key_to_cpu(buf, &key, i); |
4a096752 CM |
981 | |
982 | mutex_lock(&root->fs_info->alloc_mutex); | |
925baedd | 983 | ret = __btrfs_inc_extent_ref(trans, root, bytenr, |
7bb86316 CM |
984 | btrfs_level_size(root, level - 1), |
985 | root->root_key.objectid, | |
f6dbff55 CM |
986 | trans->transid, |
987 | level - 1, key.objectid); | |
4a096752 | 988 | mutex_unlock(&root->fs_info->alloc_mutex); |
54aa1f4d CM |
989 | if (ret) { |
990 | faili = i; | |
4a096752 | 991 | WARN_ON(1); |
54aa1f4d CM |
992 | goto fail; |
993 | } | |
6407bf6d | 994 | } |
02217ed2 | 995 | } |
31153d81 YZ |
996 | /* cache orignal leaf block's references */ |
997 | if (level == 0 && cache_ref && buf != root->commit_root) { | |
998 | struct btrfs_leaf_ref *ref; | |
999 | struct btrfs_extent_info *info; | |
1000 | ||
1001 | ref = btrfs_alloc_leaf_ref(nr_file_extents); | |
1002 | if (!ref) { | |
1003 | WARN_ON(1); | |
1004 | goto out; | |
1005 | } | |
1006 | ||
31153d81 YZ |
1007 | ref->bytenr = buf->start; |
1008 | ref->owner = btrfs_header_owner(buf); | |
1009 | ref->generation = btrfs_header_generation(buf); | |
1010 | ref->nritems = nr_file_extents; | |
1011 | info = ref->extents; | |
1012 | ||
1013 | for (i = 0; nr_file_extents > 0 && i < nritems; i++) { | |
1014 | u64 disk_bytenr; | |
1015 | btrfs_item_key_to_cpu(buf, &key, i); | |
1016 | if (btrfs_key_type(&key) != BTRFS_EXTENT_DATA_KEY) | |
1017 | continue; | |
1018 | fi = btrfs_item_ptr(buf, i, | |
1019 | struct btrfs_file_extent_item); | |
1020 | if (btrfs_file_extent_type(buf, fi) == | |
1021 | BTRFS_FILE_EXTENT_INLINE) | |
1022 | continue; | |
1023 | disk_bytenr = btrfs_file_extent_disk_bytenr(buf, fi); | |
1024 | if (disk_bytenr == 0) | |
1025 | continue; | |
1026 | ||
1027 | info->bytenr = disk_bytenr; | |
1028 | info->num_bytes = | |
1029 | btrfs_file_extent_disk_num_bytes(buf, fi); | |
1030 | info->objectid = key.objectid; | |
1031 | info->offset = key.offset; | |
1032 | info++; | |
1033 | } | |
1034 | ||
1035 | BUG_ON(!root->ref_tree); | |
1036 | ret = btrfs_add_leaf_ref(root, ref); | |
1037 | WARN_ON(ret); | |
1038 | btrfs_free_leaf_ref(ref); | |
1039 | } | |
1040 | out: | |
02217ed2 | 1041 | return 0; |
54aa1f4d | 1042 | fail: |
ccd467d6 | 1043 | WARN_ON(1); |
7bb86316 | 1044 | #if 0 |
54aa1f4d | 1045 | for (i =0; i < faili; i++) { |
db94535d CM |
1046 | if (level == 0) { |
1047 | u64 disk_bytenr; | |
5f39d397 CM |
1048 | btrfs_item_key_to_cpu(buf, &key, i); |
1049 | if (btrfs_key_type(&key) != BTRFS_EXTENT_DATA_KEY) | |
54aa1f4d | 1050 | continue; |
5f39d397 | 1051 | fi = btrfs_item_ptr(buf, i, |
54aa1f4d | 1052 | struct btrfs_file_extent_item); |
5f39d397 | 1053 | if (btrfs_file_extent_type(buf, fi) == |
54aa1f4d CM |
1054 | BTRFS_FILE_EXTENT_INLINE) |
1055 | continue; | |
db94535d CM |
1056 | disk_bytenr = btrfs_file_extent_disk_bytenr(buf, fi); |
1057 | if (disk_bytenr == 0) | |
54aa1f4d | 1058 | continue; |
db94535d CM |
1059 | err = btrfs_free_extent(trans, root, disk_bytenr, |
1060 | btrfs_file_extent_disk_num_bytes(buf, | |
5f39d397 | 1061 | fi), 0); |
54aa1f4d CM |
1062 | BUG_ON(err); |
1063 | } else { | |
db94535d CM |
1064 | bytenr = btrfs_node_blockptr(buf, i); |
1065 | err = btrfs_free_extent(trans, root, bytenr, | |
1066 | btrfs_level_size(root, level - 1), 0); | |
54aa1f4d CM |
1067 | BUG_ON(err); |
1068 | } | |
1069 | } | |
7bb86316 | 1070 | #endif |
54aa1f4d | 1071 | return ret; |
02217ed2 CM |
1072 | } |
1073 | ||
9078a3e1 CM |
1074 | static int write_one_cache_group(struct btrfs_trans_handle *trans, |
1075 | struct btrfs_root *root, | |
1076 | struct btrfs_path *path, | |
1077 | struct btrfs_block_group_cache *cache) | |
1078 | { | |
1079 | int ret; | |
1080 | int pending_ret; | |
1081 | struct btrfs_root *extent_root = root->fs_info->extent_root; | |
5f39d397 CM |
1082 | unsigned long bi; |
1083 | struct extent_buffer *leaf; | |
9078a3e1 | 1084 | |
9078a3e1 | 1085 | ret = btrfs_search_slot(trans, extent_root, &cache->key, path, 0, 1); |
54aa1f4d CM |
1086 | if (ret < 0) |
1087 | goto fail; | |
9078a3e1 | 1088 | BUG_ON(ret); |
5f39d397 CM |
1089 | |
1090 | leaf = path->nodes[0]; | |
1091 | bi = btrfs_item_ptr_offset(leaf, path->slots[0]); | |
1092 | write_extent_buffer(leaf, &cache->item, bi, sizeof(cache->item)); | |
1093 | btrfs_mark_buffer_dirty(leaf); | |
9078a3e1 | 1094 | btrfs_release_path(extent_root, path); |
54aa1f4d | 1095 | fail: |
9078a3e1 CM |
1096 | finish_current_insert(trans, extent_root); |
1097 | pending_ret = del_pending_extents(trans, extent_root); | |
1098 | if (ret) | |
1099 | return ret; | |
1100 | if (pending_ret) | |
1101 | return pending_ret; | |
1102 | return 0; | |
1103 | ||
1104 | } | |
1105 | ||
96b5179d CM |
1106 | int btrfs_write_dirty_block_groups(struct btrfs_trans_handle *trans, |
1107 | struct btrfs_root *root) | |
9078a3e1 | 1108 | { |
d1310b2e | 1109 | struct extent_io_tree *block_group_cache; |
96b5179d | 1110 | struct btrfs_block_group_cache *cache; |
9078a3e1 CM |
1111 | int ret; |
1112 | int err = 0; | |
1113 | int werr = 0; | |
9078a3e1 | 1114 | struct btrfs_path *path; |
96b5179d CM |
1115 | u64 last = 0; |
1116 | u64 start; | |
1117 | u64 end; | |
1118 | u64 ptr; | |
9078a3e1 | 1119 | |
96b5179d | 1120 | block_group_cache = &root->fs_info->block_group_cache; |
9078a3e1 CM |
1121 | path = btrfs_alloc_path(); |
1122 | if (!path) | |
1123 | return -ENOMEM; | |
1124 | ||
925baedd | 1125 | mutex_lock(&root->fs_info->alloc_mutex); |
9078a3e1 | 1126 | while(1) { |
96b5179d CM |
1127 | ret = find_first_extent_bit(block_group_cache, last, |
1128 | &start, &end, BLOCK_GROUP_DIRTY); | |
1129 | if (ret) | |
9078a3e1 | 1130 | break; |
54aa1f4d | 1131 | |
96b5179d CM |
1132 | last = end + 1; |
1133 | ret = get_state_private(block_group_cache, start, &ptr); | |
1134 | if (ret) | |
1135 | break; | |
ae2f5411 | 1136 | cache = (struct btrfs_block_group_cache *)(unsigned long)ptr; |
96b5179d CM |
1137 | err = write_one_cache_group(trans, root, |
1138 | path, cache); | |
1139 | /* | |
1140 | * if we fail to write the cache group, we want | |
1141 | * to keep it marked dirty in hopes that a later | |
1142 | * write will work | |
1143 | */ | |
1144 | if (err) { | |
1145 | werr = err; | |
1146 | continue; | |
9078a3e1 | 1147 | } |
96b5179d CM |
1148 | clear_extent_bits(block_group_cache, start, end, |
1149 | BLOCK_GROUP_DIRTY, GFP_NOFS); | |
9078a3e1 CM |
1150 | } |
1151 | btrfs_free_path(path); | |
925baedd | 1152 | mutex_unlock(&root->fs_info->alloc_mutex); |
9078a3e1 CM |
1153 | return werr; |
1154 | } | |
1155 | ||
6324fbf3 CM |
1156 | static struct btrfs_space_info *__find_space_info(struct btrfs_fs_info *info, |
1157 | u64 flags) | |
1158 | { | |
1159 | struct list_head *head = &info->space_info; | |
1160 | struct list_head *cur; | |
1161 | struct btrfs_space_info *found; | |
1162 | list_for_each(cur, head) { | |
1163 | found = list_entry(cur, struct btrfs_space_info, list); | |
1164 | if (found->flags == flags) | |
1165 | return found; | |
1166 | } | |
1167 | return NULL; | |
1168 | ||
1169 | } | |
1170 | ||
593060d7 CM |
1171 | static int update_space_info(struct btrfs_fs_info *info, u64 flags, |
1172 | u64 total_bytes, u64 bytes_used, | |
1173 | struct btrfs_space_info **space_info) | |
1174 | { | |
1175 | struct btrfs_space_info *found; | |
1176 | ||
1177 | found = __find_space_info(info, flags); | |
1178 | if (found) { | |
1179 | found->total_bytes += total_bytes; | |
1180 | found->bytes_used += bytes_used; | |
8f18cf13 | 1181 | found->full = 0; |
593060d7 CM |
1182 | WARN_ON(found->total_bytes < found->bytes_used); |
1183 | *space_info = found; | |
1184 | return 0; | |
1185 | } | |
1186 | found = kmalloc(sizeof(*found), GFP_NOFS); | |
1187 | if (!found) | |
1188 | return -ENOMEM; | |
1189 | ||
1190 | list_add(&found->list, &info->space_info); | |
1191 | found->flags = flags; | |
1192 | found->total_bytes = total_bytes; | |
1193 | found->bytes_used = bytes_used; | |
1194 | found->bytes_pinned = 0; | |
1195 | found->full = 0; | |
0ef3e66b | 1196 | found->force_alloc = 0; |
593060d7 CM |
1197 | *space_info = found; |
1198 | return 0; | |
1199 | } | |
1200 | ||
8790d502 CM |
1201 | static void set_avail_alloc_bits(struct btrfs_fs_info *fs_info, u64 flags) |
1202 | { | |
1203 | u64 extra_flags = flags & (BTRFS_BLOCK_GROUP_RAID0 | | |
611f0e00 | 1204 | BTRFS_BLOCK_GROUP_RAID1 | |
321aecc6 | 1205 | BTRFS_BLOCK_GROUP_RAID10 | |
611f0e00 | 1206 | BTRFS_BLOCK_GROUP_DUP); |
8790d502 CM |
1207 | if (extra_flags) { |
1208 | if (flags & BTRFS_BLOCK_GROUP_DATA) | |
1209 | fs_info->avail_data_alloc_bits |= extra_flags; | |
1210 | if (flags & BTRFS_BLOCK_GROUP_METADATA) | |
1211 | fs_info->avail_metadata_alloc_bits |= extra_flags; | |
1212 | if (flags & BTRFS_BLOCK_GROUP_SYSTEM) | |
1213 | fs_info->avail_system_alloc_bits |= extra_flags; | |
1214 | } | |
1215 | } | |
593060d7 | 1216 | |
a061fc8d | 1217 | static u64 reduce_alloc_profile(struct btrfs_root *root, u64 flags) |
ec44a35c | 1218 | { |
a061fc8d CM |
1219 | u64 num_devices = root->fs_info->fs_devices->num_devices; |
1220 | ||
1221 | if (num_devices == 1) | |
1222 | flags &= ~(BTRFS_BLOCK_GROUP_RAID1 | BTRFS_BLOCK_GROUP_RAID0); | |
1223 | if (num_devices < 4) | |
1224 | flags &= ~BTRFS_BLOCK_GROUP_RAID10; | |
1225 | ||
ec44a35c CM |
1226 | if ((flags & BTRFS_BLOCK_GROUP_DUP) && |
1227 | (flags & (BTRFS_BLOCK_GROUP_RAID1 | | |
a061fc8d | 1228 | BTRFS_BLOCK_GROUP_RAID10))) { |
ec44a35c | 1229 | flags &= ~BTRFS_BLOCK_GROUP_DUP; |
a061fc8d | 1230 | } |
ec44a35c CM |
1231 | |
1232 | if ((flags & BTRFS_BLOCK_GROUP_RAID1) && | |
a061fc8d | 1233 | (flags & BTRFS_BLOCK_GROUP_RAID10)) { |
ec44a35c | 1234 | flags &= ~BTRFS_BLOCK_GROUP_RAID1; |
a061fc8d | 1235 | } |
ec44a35c CM |
1236 | |
1237 | if ((flags & BTRFS_BLOCK_GROUP_RAID0) && | |
1238 | ((flags & BTRFS_BLOCK_GROUP_RAID1) | | |
1239 | (flags & BTRFS_BLOCK_GROUP_RAID10) | | |
1240 | (flags & BTRFS_BLOCK_GROUP_DUP))) | |
1241 | flags &= ~BTRFS_BLOCK_GROUP_RAID0; | |
1242 | return flags; | |
1243 | } | |
1244 | ||
6324fbf3 CM |
1245 | static int do_chunk_alloc(struct btrfs_trans_handle *trans, |
1246 | struct btrfs_root *extent_root, u64 alloc_bytes, | |
0ef3e66b | 1247 | u64 flags, int force) |
6324fbf3 CM |
1248 | { |
1249 | struct btrfs_space_info *space_info; | |
1250 | u64 thresh; | |
1251 | u64 start; | |
1252 | u64 num_bytes; | |
1253 | int ret; | |
1254 | ||
a061fc8d | 1255 | flags = reduce_alloc_profile(extent_root, flags); |
ec44a35c | 1256 | |
6324fbf3 | 1257 | space_info = __find_space_info(extent_root->fs_info, flags); |
593060d7 CM |
1258 | if (!space_info) { |
1259 | ret = update_space_info(extent_root->fs_info, flags, | |
1260 | 0, 0, &space_info); | |
1261 | BUG_ON(ret); | |
1262 | } | |
6324fbf3 CM |
1263 | BUG_ON(!space_info); |
1264 | ||
0ef3e66b CM |
1265 | if (space_info->force_alloc) { |
1266 | force = 1; | |
1267 | space_info->force_alloc = 0; | |
1268 | } | |
6324fbf3 | 1269 | if (space_info->full) |
925baedd | 1270 | goto out; |
6324fbf3 | 1271 | |
8790d502 | 1272 | thresh = div_factor(space_info->total_bytes, 6); |
0ef3e66b CM |
1273 | if (!force && |
1274 | (space_info->bytes_used + space_info->bytes_pinned + alloc_bytes) < | |
6324fbf3 | 1275 | thresh) |
925baedd | 1276 | goto out; |
6324fbf3 | 1277 | |
925baedd | 1278 | mutex_lock(&extent_root->fs_info->chunk_mutex); |
6324fbf3 CM |
1279 | ret = btrfs_alloc_chunk(trans, extent_root, &start, &num_bytes, flags); |
1280 | if (ret == -ENOSPC) { | |
1281 | printk("space info full %Lu\n", flags); | |
1282 | space_info->full = 1; | |
a74a4b97 | 1283 | goto out_unlock; |
6324fbf3 | 1284 | } |
6324fbf3 CM |
1285 | BUG_ON(ret); |
1286 | ||
1287 | ret = btrfs_make_block_group(trans, extent_root, 0, flags, | |
e17cade2 | 1288 | BTRFS_FIRST_CHUNK_TREE_OBJECTID, start, num_bytes); |
6324fbf3 | 1289 | BUG_ON(ret); |
a74a4b97 | 1290 | out_unlock: |
333db94c | 1291 | mutex_unlock(&extent_root->fs_info->chunk_mutex); |
a74a4b97 | 1292 | out: |
6324fbf3 CM |
1293 | return 0; |
1294 | } | |
1295 | ||
9078a3e1 CM |
1296 | static int update_block_group(struct btrfs_trans_handle *trans, |
1297 | struct btrfs_root *root, | |
db94535d | 1298 | u64 bytenr, u64 num_bytes, int alloc, |
0b86a832 | 1299 | int mark_free) |
9078a3e1 CM |
1300 | { |
1301 | struct btrfs_block_group_cache *cache; | |
1302 | struct btrfs_fs_info *info = root->fs_info; | |
db94535d | 1303 | u64 total = num_bytes; |
9078a3e1 | 1304 | u64 old_val; |
db94535d | 1305 | u64 byte_in_group; |
96b5179d CM |
1306 | u64 start; |
1307 | u64 end; | |
3e1ad54f | 1308 | |
7d9eb12c | 1309 | WARN_ON(!mutex_is_locked(&root->fs_info->alloc_mutex)); |
9078a3e1 | 1310 | while(total) { |
db94535d | 1311 | cache = btrfs_lookup_block_group(info, bytenr); |
3e1ad54f | 1312 | if (!cache) { |
9078a3e1 | 1313 | return -1; |
cd1bc465 | 1314 | } |
db94535d CM |
1315 | byte_in_group = bytenr - cache->key.objectid; |
1316 | WARN_ON(byte_in_group > cache->key.offset); | |
96b5179d CM |
1317 | start = cache->key.objectid; |
1318 | end = start + cache->key.offset - 1; | |
1319 | set_extent_bits(&info->block_group_cache, start, end, | |
1320 | BLOCK_GROUP_DIRTY, GFP_NOFS); | |
9078a3e1 | 1321 | |
c286ac48 | 1322 | spin_lock(&cache->lock); |
9078a3e1 | 1323 | old_val = btrfs_block_group_used(&cache->item); |
db94535d | 1324 | num_bytes = min(total, cache->key.offset - byte_in_group); |
cd1bc465 | 1325 | if (alloc) { |
db94535d | 1326 | old_val += num_bytes; |
6324fbf3 | 1327 | cache->space_info->bytes_used += num_bytes; |
c286ac48 CM |
1328 | btrfs_set_block_group_used(&cache->item, old_val); |
1329 | spin_unlock(&cache->lock); | |
cd1bc465 | 1330 | } else { |
db94535d | 1331 | old_val -= num_bytes; |
6324fbf3 | 1332 | cache->space_info->bytes_used -= num_bytes; |
c286ac48 CM |
1333 | btrfs_set_block_group_used(&cache->item, old_val); |
1334 | spin_unlock(&cache->lock); | |
f510cfec CM |
1335 | if (mark_free) { |
1336 | set_extent_dirty(&info->free_space_cache, | |
db94535d | 1337 | bytenr, bytenr + num_bytes - 1, |
f510cfec | 1338 | GFP_NOFS); |
e37c9e69 | 1339 | } |
cd1bc465 | 1340 | } |
db94535d CM |
1341 | total -= num_bytes; |
1342 | bytenr += num_bytes; | |
9078a3e1 CM |
1343 | } |
1344 | return 0; | |
1345 | } | |
6324fbf3 | 1346 | |
a061fc8d CM |
1347 | static u64 first_logical_byte(struct btrfs_root *root, u64 search_start) |
1348 | { | |
1349 | u64 start; | |
1350 | u64 end; | |
1351 | int ret; | |
1352 | ret = find_first_extent_bit(&root->fs_info->block_group_cache, | |
1353 | search_start, &start, &end, | |
1354 | BLOCK_GROUP_DATA | BLOCK_GROUP_METADATA | | |
1355 | BLOCK_GROUP_SYSTEM); | |
1356 | if (ret) | |
1357 | return 0; | |
1358 | return start; | |
1359 | } | |
1360 | ||
1361 | ||
324ae4df Y |
1362 | static int update_pinned_extents(struct btrfs_root *root, |
1363 | u64 bytenr, u64 num, int pin) | |
1364 | { | |
1365 | u64 len; | |
1366 | struct btrfs_block_group_cache *cache; | |
1367 | struct btrfs_fs_info *fs_info = root->fs_info; | |
1368 | ||
7d9eb12c | 1369 | WARN_ON(!mutex_is_locked(&root->fs_info->alloc_mutex)); |
324ae4df Y |
1370 | if (pin) { |
1371 | set_extent_dirty(&fs_info->pinned_extents, | |
1372 | bytenr, bytenr + num - 1, GFP_NOFS); | |
1373 | } else { | |
1374 | clear_extent_dirty(&fs_info->pinned_extents, | |
1375 | bytenr, bytenr + num - 1, GFP_NOFS); | |
1376 | } | |
1377 | while (num > 0) { | |
1378 | cache = btrfs_lookup_block_group(fs_info, bytenr); | |
a061fc8d CM |
1379 | if (!cache) { |
1380 | u64 first = first_logical_byte(root, bytenr); | |
1381 | WARN_ON(first < bytenr); | |
1382 | len = min(first - bytenr, num); | |
1383 | } else { | |
1384 | len = min(num, cache->key.offset - | |
1385 | (bytenr - cache->key.objectid)); | |
1386 | } | |
324ae4df | 1387 | if (pin) { |
a061fc8d | 1388 | if (cache) { |
c286ac48 | 1389 | spin_lock(&cache->lock); |
a061fc8d CM |
1390 | cache->pinned += len; |
1391 | cache->space_info->bytes_pinned += len; | |
c286ac48 | 1392 | spin_unlock(&cache->lock); |
a061fc8d | 1393 | } |
324ae4df Y |
1394 | fs_info->total_pinned += len; |
1395 | } else { | |
a061fc8d | 1396 | if (cache) { |
c286ac48 | 1397 | spin_lock(&cache->lock); |
a061fc8d CM |
1398 | cache->pinned -= len; |
1399 | cache->space_info->bytes_pinned -= len; | |
c286ac48 | 1400 | spin_unlock(&cache->lock); |
a061fc8d | 1401 | } |
324ae4df Y |
1402 | fs_info->total_pinned -= len; |
1403 | } | |
1404 | bytenr += len; | |
1405 | num -= len; | |
1406 | } | |
1407 | return 0; | |
1408 | } | |
9078a3e1 | 1409 | |
d1310b2e | 1410 | int btrfs_copy_pinned(struct btrfs_root *root, struct extent_io_tree *copy) |
ccd467d6 | 1411 | { |
ccd467d6 | 1412 | u64 last = 0; |
1a5bc167 CM |
1413 | u64 start; |
1414 | u64 end; | |
d1310b2e | 1415 | struct extent_io_tree *pinned_extents = &root->fs_info->pinned_extents; |
ccd467d6 | 1416 | int ret; |
ccd467d6 CM |
1417 | |
1418 | while(1) { | |
1a5bc167 CM |
1419 | ret = find_first_extent_bit(pinned_extents, last, |
1420 | &start, &end, EXTENT_DIRTY); | |
1421 | if (ret) | |
ccd467d6 | 1422 | break; |
1a5bc167 CM |
1423 | set_extent_dirty(copy, start, end, GFP_NOFS); |
1424 | last = end + 1; | |
ccd467d6 CM |
1425 | } |
1426 | return 0; | |
1427 | } | |
1428 | ||
1429 | int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans, | |
1430 | struct btrfs_root *root, | |
d1310b2e | 1431 | struct extent_io_tree *unpin) |
a28ec197 | 1432 | { |
1a5bc167 CM |
1433 | u64 start; |
1434 | u64 end; | |
a28ec197 | 1435 | int ret; |
d1310b2e | 1436 | struct extent_io_tree *free_space_cache; |
f510cfec | 1437 | free_space_cache = &root->fs_info->free_space_cache; |
a28ec197 | 1438 | |
925baedd | 1439 | mutex_lock(&root->fs_info->alloc_mutex); |
a28ec197 | 1440 | while(1) { |
1a5bc167 CM |
1441 | ret = find_first_extent_bit(unpin, 0, &start, &end, |
1442 | EXTENT_DIRTY); | |
1443 | if (ret) | |
a28ec197 | 1444 | break; |
324ae4df | 1445 | update_pinned_extents(root, start, end + 1 - start, 0); |
1a5bc167 CM |
1446 | clear_extent_dirty(unpin, start, end, GFP_NOFS); |
1447 | set_extent_dirty(free_space_cache, start, end, GFP_NOFS); | |
c286ac48 CM |
1448 | if (need_resched()) { |
1449 | mutex_unlock(&root->fs_info->alloc_mutex); | |
1450 | cond_resched(); | |
1451 | mutex_lock(&root->fs_info->alloc_mutex); | |
1452 | } | |
a28ec197 | 1453 | } |
925baedd | 1454 | mutex_unlock(&root->fs_info->alloc_mutex); |
a28ec197 CM |
1455 | return 0; |
1456 | } | |
1457 | ||
98ed5174 CM |
1458 | static int finish_current_insert(struct btrfs_trans_handle *trans, |
1459 | struct btrfs_root *extent_root) | |
037e6390 | 1460 | { |
7bb86316 CM |
1461 | u64 start; |
1462 | u64 end; | |
1463 | struct btrfs_fs_info *info = extent_root->fs_info; | |
d8d5f3e1 | 1464 | struct extent_buffer *eb; |
7bb86316 | 1465 | struct btrfs_path *path; |
e2fa7227 | 1466 | struct btrfs_key ins; |
d8d5f3e1 | 1467 | struct btrfs_disk_key first; |
234b63a0 | 1468 | struct btrfs_extent_item extent_item; |
037e6390 | 1469 | int ret; |
d8d5f3e1 | 1470 | int level; |
1a5bc167 | 1471 | int err = 0; |
037e6390 | 1472 | |
7d9eb12c | 1473 | WARN_ON(!mutex_is_locked(&extent_root->fs_info->alloc_mutex)); |
5f39d397 | 1474 | btrfs_set_stack_extent_refs(&extent_item, 1); |
62e2749e | 1475 | btrfs_set_key_type(&ins, BTRFS_EXTENT_ITEM_KEY); |
7bb86316 | 1476 | path = btrfs_alloc_path(); |
037e6390 | 1477 | |
26b8003f | 1478 | while(1) { |
1a5bc167 CM |
1479 | ret = find_first_extent_bit(&info->extent_ins, 0, &start, |
1480 | &end, EXTENT_LOCKED); | |
1481 | if (ret) | |
26b8003f CM |
1482 | break; |
1483 | ||
1a5bc167 CM |
1484 | ins.objectid = start; |
1485 | ins.offset = end + 1 - start; | |
1486 | err = btrfs_insert_item(trans, extent_root, &ins, | |
1487 | &extent_item, sizeof(extent_item)); | |
1488 | clear_extent_bits(&info->extent_ins, start, end, EXTENT_LOCKED, | |
1489 | GFP_NOFS); | |
c286ac48 CM |
1490 | |
1491 | eb = btrfs_find_tree_block(extent_root, ins.objectid, | |
1492 | ins.offset); | |
1493 | ||
1494 | if (!btrfs_buffer_uptodate(eb, trans->transid)) { | |
1495 | mutex_unlock(&extent_root->fs_info->alloc_mutex); | |
1496 | btrfs_read_buffer(eb, trans->transid); | |
1497 | mutex_lock(&extent_root->fs_info->alloc_mutex); | |
1498 | } | |
1499 | ||
925baedd | 1500 | btrfs_tree_lock(eb); |
d8d5f3e1 CM |
1501 | level = btrfs_header_level(eb); |
1502 | if (level == 0) { | |
1503 | btrfs_item_key(eb, &first, 0); | |
1504 | } else { | |
1505 | btrfs_node_key(eb, &first, 0); | |
1506 | } | |
925baedd CM |
1507 | btrfs_tree_unlock(eb); |
1508 | free_extent_buffer(eb); | |
1509 | /* | |
1510 | * the first key is just a hint, so the race we've created | |
1511 | * against reading it is fine | |
1512 | */ | |
7bb86316 CM |
1513 | err = btrfs_insert_extent_backref(trans, extent_root, path, |
1514 | start, extent_root->root_key.objectid, | |
f6dbff55 CM |
1515 | 0, level, |
1516 | btrfs_disk_key_objectid(&first)); | |
7bb86316 | 1517 | BUG_ON(err); |
c286ac48 CM |
1518 | if (need_resched()) { |
1519 | mutex_unlock(&extent_root->fs_info->alloc_mutex); | |
1520 | cond_resched(); | |
1521 | mutex_lock(&extent_root->fs_info->alloc_mutex); | |
1522 | } | |
037e6390 | 1523 | } |
7bb86316 | 1524 | btrfs_free_path(path); |
037e6390 CM |
1525 | return 0; |
1526 | } | |
1527 | ||
db94535d CM |
1528 | static int pin_down_bytes(struct btrfs_root *root, u64 bytenr, u32 num_bytes, |
1529 | int pending) | |
e20d96d6 | 1530 | { |
1a5bc167 | 1531 | int err = 0; |
8ef97622 | 1532 | |
7d9eb12c | 1533 | WARN_ON(!mutex_is_locked(&root->fs_info->alloc_mutex)); |
f4b9aa8d | 1534 | if (!pending) { |
925baedd | 1535 | struct extent_buffer *buf; |
db94535d | 1536 | buf = btrfs_find_tree_block(root, bytenr, num_bytes); |
5f39d397 | 1537 | if (buf) { |
974e35a8 Y |
1538 | if (btrfs_buffer_uptodate(buf, 0) && |
1539 | btrfs_try_tree_lock(buf)) { | |
2c90e5d6 CM |
1540 | u64 transid = |
1541 | root->fs_info->running_transaction->transid; | |
dc17ff8f CM |
1542 | u64 header_transid = |
1543 | btrfs_header_generation(buf); | |
6bc34676 CM |
1544 | if (header_transid == transid && |
1545 | !btrfs_header_flag(buf, | |
1546 | BTRFS_HEADER_FLAG_WRITTEN)) { | |
55c69072 | 1547 | clean_tree_block(NULL, root, buf); |
925baedd | 1548 | btrfs_tree_unlock(buf); |
5f39d397 | 1549 | free_extent_buffer(buf); |
c549228f | 1550 | return 1; |
2c90e5d6 | 1551 | } |
925baedd | 1552 | btrfs_tree_unlock(buf); |
f4b9aa8d | 1553 | } |
5f39d397 | 1554 | free_extent_buffer(buf); |
8ef97622 | 1555 | } |
324ae4df | 1556 | update_pinned_extents(root, bytenr, num_bytes, 1); |
f4b9aa8d | 1557 | } else { |
1a5bc167 | 1558 | set_extent_bits(&root->fs_info->pending_del, |
db94535d CM |
1559 | bytenr, bytenr + num_bytes - 1, |
1560 | EXTENT_LOCKED, GFP_NOFS); | |
f4b9aa8d | 1561 | } |
be744175 | 1562 | BUG_ON(err < 0); |
e20d96d6 CM |
1563 | return 0; |
1564 | } | |
1565 | ||
fec577fb | 1566 | /* |
a28ec197 | 1567 | * remove an extent from the root, returns 0 on success |
fec577fb | 1568 | */ |
e089f05c | 1569 | static int __free_extent(struct btrfs_trans_handle *trans, struct btrfs_root |
7bb86316 CM |
1570 | *root, u64 bytenr, u64 num_bytes, |
1571 | u64 root_objectid, u64 ref_generation, | |
1572 | u64 owner_objectid, u64 owner_offset, int pin, | |
e37c9e69 | 1573 | int mark_free) |
a28ec197 | 1574 | { |
5caf2a00 | 1575 | struct btrfs_path *path; |
e2fa7227 | 1576 | struct btrfs_key key; |
1261ec42 CM |
1577 | struct btrfs_fs_info *info = root->fs_info; |
1578 | struct btrfs_root *extent_root = info->extent_root; | |
5f39d397 | 1579 | struct extent_buffer *leaf; |
a28ec197 | 1580 | int ret; |
952fccac CM |
1581 | int extent_slot = 0; |
1582 | int found_extent = 0; | |
1583 | int num_to_del = 1; | |
234b63a0 | 1584 | struct btrfs_extent_item *ei; |
cf27e1ee | 1585 | u32 refs; |
037e6390 | 1586 | |
7d9eb12c | 1587 | WARN_ON(!mutex_is_locked(&root->fs_info->alloc_mutex)); |
db94535d | 1588 | key.objectid = bytenr; |
62e2749e | 1589 | btrfs_set_key_type(&key, BTRFS_EXTENT_ITEM_KEY); |
db94535d | 1590 | key.offset = num_bytes; |
5caf2a00 | 1591 | path = btrfs_alloc_path(); |
54aa1f4d CM |
1592 | if (!path) |
1593 | return -ENOMEM; | |
5f26f772 | 1594 | |
3c12ac72 | 1595 | path->reada = 1; |
7bb86316 CM |
1596 | ret = lookup_extent_backref(trans, extent_root, path, |
1597 | bytenr, root_objectid, | |
1598 | ref_generation, | |
1599 | owner_objectid, owner_offset, 1); | |
1600 | if (ret == 0) { | |
952fccac CM |
1601 | struct btrfs_key found_key; |
1602 | extent_slot = path->slots[0]; | |
1603 | while(extent_slot > 0) { | |
1604 | extent_slot--; | |
1605 | btrfs_item_key_to_cpu(path->nodes[0], &found_key, | |
1606 | extent_slot); | |
1607 | if (found_key.objectid != bytenr) | |
1608 | break; | |
1609 | if (found_key.type == BTRFS_EXTENT_ITEM_KEY && | |
1610 | found_key.offset == num_bytes) { | |
1611 | found_extent = 1; | |
1612 | break; | |
1613 | } | |
1614 | if (path->slots[0] - extent_slot > 5) | |
1615 | break; | |
1616 | } | |
1617 | if (!found_extent) | |
1618 | ret = btrfs_del_item(trans, extent_root, path); | |
7bb86316 CM |
1619 | } else { |
1620 | btrfs_print_leaf(extent_root, path->nodes[0]); | |
1621 | WARN_ON(1); | |
1622 | printk("Unable to find ref byte nr %Lu root %Lu " | |
1623 | " gen %Lu owner %Lu offset %Lu\n", bytenr, | |
1624 | root_objectid, ref_generation, owner_objectid, | |
1625 | owner_offset); | |
1626 | } | |
952fccac CM |
1627 | if (!found_extent) { |
1628 | btrfs_release_path(extent_root, path); | |
1629 | ret = btrfs_search_slot(trans, extent_root, &key, path, -1, 1); | |
1630 | if (ret < 0) | |
1631 | return ret; | |
1632 | BUG_ON(ret); | |
1633 | extent_slot = path->slots[0]; | |
1634 | } | |
5f39d397 CM |
1635 | |
1636 | leaf = path->nodes[0]; | |
952fccac | 1637 | ei = btrfs_item_ptr(leaf, extent_slot, |
123abc88 | 1638 | struct btrfs_extent_item); |
5f39d397 CM |
1639 | refs = btrfs_extent_refs(leaf, ei); |
1640 | BUG_ON(refs == 0); | |
1641 | refs -= 1; | |
1642 | btrfs_set_extent_refs(leaf, ei, refs); | |
952fccac | 1643 | |
5f39d397 CM |
1644 | btrfs_mark_buffer_dirty(leaf); |
1645 | ||
952fccac CM |
1646 | if (refs == 0 && found_extent && path->slots[0] == extent_slot + 1) { |
1647 | /* if the back ref and the extent are next to each other | |
1648 | * they get deleted below in one shot | |
1649 | */ | |
1650 | path->slots[0] = extent_slot; | |
1651 | num_to_del = 2; | |
1652 | } else if (found_extent) { | |
1653 | /* otherwise delete the extent back ref */ | |
1654 | ret = btrfs_del_item(trans, extent_root, path); | |
1655 | BUG_ON(ret); | |
1656 | /* if refs are 0, we need to setup the path for deletion */ | |
1657 | if (refs == 0) { | |
1658 | btrfs_release_path(extent_root, path); | |
1659 | ret = btrfs_search_slot(trans, extent_root, &key, path, | |
1660 | -1, 1); | |
1661 | if (ret < 0) | |
1662 | return ret; | |
1663 | BUG_ON(ret); | |
1664 | } | |
1665 | } | |
1666 | ||
cf27e1ee | 1667 | if (refs == 0) { |
db94535d CM |
1668 | u64 super_used; |
1669 | u64 root_used; | |
78fae27e CM |
1670 | |
1671 | if (pin) { | |
db94535d | 1672 | ret = pin_down_bytes(root, bytenr, num_bytes, 0); |
c549228f Y |
1673 | if (ret > 0) |
1674 | mark_free = 1; | |
1675 | BUG_ON(ret < 0); | |
78fae27e CM |
1676 | } |
1677 | ||
58176a96 | 1678 | /* block accounting for super block */ |
a2135011 | 1679 | spin_lock_irq(&info->delalloc_lock); |
db94535d CM |
1680 | super_used = btrfs_super_bytes_used(&info->super_copy); |
1681 | btrfs_set_super_bytes_used(&info->super_copy, | |
1682 | super_used - num_bytes); | |
a2135011 | 1683 | spin_unlock_irq(&info->delalloc_lock); |
58176a96 JB |
1684 | |
1685 | /* block accounting for root item */ | |
db94535d | 1686 | root_used = btrfs_root_used(&root->root_item); |
5f39d397 | 1687 | btrfs_set_root_used(&root->root_item, |
db94535d | 1688 | root_used - num_bytes); |
952fccac CM |
1689 | ret = btrfs_del_items(trans, extent_root, path, path->slots[0], |
1690 | num_to_del); | |
54aa1f4d CM |
1691 | if (ret) { |
1692 | return ret; | |
1693 | } | |
db94535d | 1694 | ret = update_block_group(trans, root, bytenr, num_bytes, 0, |
0b86a832 | 1695 | mark_free); |
9078a3e1 | 1696 | BUG_ON(ret); |
a28ec197 | 1697 | } |
5caf2a00 | 1698 | btrfs_free_path(path); |
e089f05c | 1699 | finish_current_insert(trans, extent_root); |
a28ec197 CM |
1700 | return ret; |
1701 | } | |
1702 | ||
a28ec197 CM |
1703 | /* |
1704 | * find all the blocks marked as pending in the radix tree and remove | |
1705 | * them from the extent map | |
1706 | */ | |
e089f05c CM |
1707 | static int del_pending_extents(struct btrfs_trans_handle *trans, struct |
1708 | btrfs_root *extent_root) | |
a28ec197 CM |
1709 | { |
1710 | int ret; | |
e20d96d6 | 1711 | int err = 0; |
1a5bc167 CM |
1712 | u64 start; |
1713 | u64 end; | |
d1310b2e CM |
1714 | struct extent_io_tree *pending_del; |
1715 | struct extent_io_tree *pinned_extents; | |
8ef97622 | 1716 | |
7d9eb12c | 1717 | WARN_ON(!mutex_is_locked(&extent_root->fs_info->alloc_mutex)); |
1a5bc167 CM |
1718 | pending_del = &extent_root->fs_info->pending_del; |
1719 | pinned_extents = &extent_root->fs_info->pinned_extents; | |
a28ec197 CM |
1720 | |
1721 | while(1) { | |
1a5bc167 CM |
1722 | ret = find_first_extent_bit(pending_del, 0, &start, &end, |
1723 | EXTENT_LOCKED); | |
1724 | if (ret) | |
a28ec197 | 1725 | break; |
1a5bc167 CM |
1726 | clear_extent_bits(pending_del, start, end, EXTENT_LOCKED, |
1727 | GFP_NOFS); | |
c286ac48 CM |
1728 | if (!test_range_bit(&extent_root->fs_info->extent_ins, |
1729 | start, end, EXTENT_LOCKED, 0)) { | |
1730 | update_pinned_extents(extent_root, start, | |
1731 | end + 1 - start, 1); | |
1732 | ret = __free_extent(trans, extent_root, | |
1733 | start, end + 1 - start, | |
1734 | extent_root->root_key.objectid, | |
1735 | 0, 0, 0, 0, 0); | |
1736 | } else { | |
1737 | clear_extent_bits(&extent_root->fs_info->extent_ins, | |
1738 | start, end, EXTENT_LOCKED, GFP_NOFS); | |
1739 | } | |
1a5bc167 CM |
1740 | if (ret) |
1741 | err = ret; | |
c286ac48 CM |
1742 | |
1743 | if (need_resched()) { | |
1744 | mutex_unlock(&extent_root->fs_info->alloc_mutex); | |
1745 | cond_resched(); | |
1746 | mutex_lock(&extent_root->fs_info->alloc_mutex); | |
1747 | } | |
fec577fb | 1748 | } |
e20d96d6 | 1749 | return err; |
fec577fb CM |
1750 | } |
1751 | ||
1752 | /* | |
1753 | * remove an extent from the root, returns 0 on success | |
1754 | */ | |
925baedd CM |
1755 | static int __btrfs_free_extent(struct btrfs_trans_handle *trans, |
1756 | struct btrfs_root *root, u64 bytenr, | |
1757 | u64 num_bytes, u64 root_objectid, | |
1758 | u64 ref_generation, u64 owner_objectid, | |
1759 | u64 owner_offset, int pin) | |
fec577fb | 1760 | { |
9f5fae2f | 1761 | struct btrfs_root *extent_root = root->fs_info->extent_root; |
fec577fb CM |
1762 | int pending_ret; |
1763 | int ret; | |
a28ec197 | 1764 | |
db94535d | 1765 | WARN_ON(num_bytes < root->sectorsize); |
7bb86316 CM |
1766 | if (!root->ref_cows) |
1767 | ref_generation = 0; | |
1768 | ||
fec577fb | 1769 | if (root == extent_root) { |
db94535d | 1770 | pin_down_bytes(root, bytenr, num_bytes, 1); |
fec577fb CM |
1771 | return 0; |
1772 | } | |
7bb86316 CM |
1773 | ret = __free_extent(trans, root, bytenr, num_bytes, root_objectid, |
1774 | ref_generation, owner_objectid, owner_offset, | |
1775 | pin, pin == 0); | |
ee6e6504 CM |
1776 | |
1777 | finish_current_insert(trans, root->fs_info->extent_root); | |
e20d96d6 | 1778 | pending_ret = del_pending_extents(trans, root->fs_info->extent_root); |
fec577fb CM |
1779 | return ret ? ret : pending_ret; |
1780 | } | |
1781 | ||
925baedd CM |
1782 | int btrfs_free_extent(struct btrfs_trans_handle *trans, |
1783 | struct btrfs_root *root, u64 bytenr, | |
1784 | u64 num_bytes, u64 root_objectid, | |
1785 | u64 ref_generation, u64 owner_objectid, | |
1786 | u64 owner_offset, int pin) | |
1787 | { | |
1788 | int ret; | |
1789 | ||
1790 | maybe_lock_mutex(root); | |
1791 | ret = __btrfs_free_extent(trans, root, bytenr, num_bytes, | |
1792 | root_objectid, ref_generation, | |
1793 | owner_objectid, owner_offset, pin); | |
1794 | maybe_unlock_mutex(root); | |
1795 | return ret; | |
1796 | } | |
1797 | ||
87ee04eb CM |
1798 | static u64 stripe_align(struct btrfs_root *root, u64 val) |
1799 | { | |
1800 | u64 mask = ((u64)root->stripesize - 1); | |
1801 | u64 ret = (val + mask) & ~mask; | |
1802 | return ret; | |
1803 | } | |
1804 | ||
fec577fb CM |
1805 | /* |
1806 | * walks the btree of allocated extents and find a hole of a given size. | |
1807 | * The key ins is changed to record the hole: | |
1808 | * ins->objectid == block start | |
62e2749e | 1809 | * ins->flags = BTRFS_EXTENT_ITEM_KEY |
fec577fb CM |
1810 | * ins->offset == number of blocks |
1811 | * Any available blocks before search_start are skipped. | |
1812 | */ | |
98ed5174 CM |
1813 | static int noinline find_free_extent(struct btrfs_trans_handle *trans, |
1814 | struct btrfs_root *orig_root, | |
1815 | u64 num_bytes, u64 empty_size, | |
1816 | u64 search_start, u64 search_end, | |
1817 | u64 hint_byte, struct btrfs_key *ins, | |
1818 | u64 exclude_start, u64 exclude_nr, | |
1819 | int data) | |
fec577fb | 1820 | { |
87ee04eb | 1821 | int ret; |
a061fc8d | 1822 | u64 orig_search_start; |
9f5fae2f | 1823 | struct btrfs_root * root = orig_root->fs_info->extent_root; |
f2458e1d | 1824 | struct btrfs_fs_info *info = root->fs_info; |
db94535d | 1825 | u64 total_needed = num_bytes; |
239b14b3 | 1826 | u64 *last_ptr = NULL; |
be08c1b9 | 1827 | struct btrfs_block_group_cache *block_group; |
be744175 | 1828 | int full_scan = 0; |
fbdc762b | 1829 | int wrapped = 0; |
0ef3e66b | 1830 | int chunk_alloc_done = 0; |
239b14b3 | 1831 | int empty_cluster = 2 * 1024 * 1024; |
0ef3e66b | 1832 | int allowed_chunk_alloc = 0; |
fec577fb | 1833 | |
db94535d | 1834 | WARN_ON(num_bytes < root->sectorsize); |
b1a4d965 CM |
1835 | btrfs_set_key_type(ins, BTRFS_EXTENT_ITEM_KEY); |
1836 | ||
0ef3e66b CM |
1837 | if (orig_root->ref_cows || empty_size) |
1838 | allowed_chunk_alloc = 1; | |
1839 | ||
239b14b3 CM |
1840 | if (data & BTRFS_BLOCK_GROUP_METADATA) { |
1841 | last_ptr = &root->fs_info->last_alloc; | |
8790d502 | 1842 | empty_cluster = 256 * 1024; |
239b14b3 CM |
1843 | } |
1844 | ||
1845 | if ((data & BTRFS_BLOCK_GROUP_DATA) && btrfs_test_opt(root, SSD)) { | |
1846 | last_ptr = &root->fs_info->last_data_alloc; | |
1847 | } | |
1848 | ||
1849 | if (last_ptr) { | |
1850 | if (*last_ptr) | |
1851 | hint_byte = *last_ptr; | |
1852 | else { | |
1853 | empty_size += empty_cluster; | |
1854 | } | |
1855 | } | |
1856 | ||
a061fc8d CM |
1857 | search_start = max(search_start, first_logical_byte(root, 0)); |
1858 | orig_search_start = search_start; | |
1859 | ||
7f93bf8d CM |
1860 | if (search_end == (u64)-1) |
1861 | search_end = btrfs_super_total_bytes(&info->super_copy); | |
0b86a832 | 1862 | |
db94535d | 1863 | if (hint_byte) { |
0ef3e66b | 1864 | block_group = btrfs_lookup_first_block_group(info, hint_byte); |
1a2b2ac7 CM |
1865 | if (!block_group) |
1866 | hint_byte = search_start; | |
c286ac48 | 1867 | block_group = btrfs_find_block_group(root, block_group, |
db94535d | 1868 | hint_byte, data, 1); |
239b14b3 CM |
1869 | if (last_ptr && *last_ptr == 0 && block_group) |
1870 | hint_byte = block_group->key.objectid; | |
be744175 | 1871 | } else { |
c286ac48 | 1872 | block_group = btrfs_find_block_group(root, |
1a2b2ac7 CM |
1873 | trans->block_group, |
1874 | search_start, data, 1); | |
be744175 | 1875 | } |
239b14b3 | 1876 | search_start = max(search_start, hint_byte); |
be744175 | 1877 | |
6702ed49 | 1878 | total_needed += empty_size; |
0b86a832 | 1879 | |
be744175 | 1880 | check_failed: |
70b043f0 | 1881 | if (!block_group) { |
0ef3e66b CM |
1882 | block_group = btrfs_lookup_first_block_group(info, |
1883 | search_start); | |
70b043f0 | 1884 | if (!block_group) |
0ef3e66b | 1885 | block_group = btrfs_lookup_first_block_group(info, |
70b043f0 CM |
1886 | orig_search_start); |
1887 | } | |
0ef3e66b CM |
1888 | if (full_scan && !chunk_alloc_done) { |
1889 | if (allowed_chunk_alloc) { | |
1890 | do_chunk_alloc(trans, root, | |
1891 | num_bytes + 2 * 1024 * 1024, data, 1); | |
1892 | allowed_chunk_alloc = 0; | |
1893 | } else if (block_group && block_group_bits(block_group, data)) { | |
1894 | block_group->space_info->force_alloc = 1; | |
1895 | } | |
1896 | chunk_alloc_done = 1; | |
1897 | } | |
0b86a832 CM |
1898 | ret = find_search_start(root, &block_group, &search_start, |
1899 | total_needed, data); | |
239b14b3 CM |
1900 | if (ret == -ENOSPC && last_ptr && *last_ptr) { |
1901 | *last_ptr = 0; | |
0ef3e66b CM |
1902 | block_group = btrfs_lookup_first_block_group(info, |
1903 | orig_search_start); | |
239b14b3 CM |
1904 | search_start = orig_search_start; |
1905 | ret = find_search_start(root, &block_group, &search_start, | |
1906 | total_needed, data); | |
1907 | } | |
1908 | if (ret == -ENOSPC) | |
1909 | goto enospc; | |
0b86a832 | 1910 | if (ret) |
d548ee51 | 1911 | goto error; |
e19caa5f | 1912 | |
239b14b3 CM |
1913 | if (last_ptr && *last_ptr && search_start != *last_ptr) { |
1914 | *last_ptr = 0; | |
1915 | if (!empty_size) { | |
1916 | empty_size += empty_cluster; | |
1917 | total_needed += empty_size; | |
1918 | } | |
0ef3e66b | 1919 | block_group = btrfs_lookup_first_block_group(info, |
239b14b3 CM |
1920 | orig_search_start); |
1921 | search_start = orig_search_start; | |
1922 | ret = find_search_start(root, &block_group, | |
1923 | &search_start, total_needed, data); | |
1924 | if (ret == -ENOSPC) | |
1925 | goto enospc; | |
1926 | if (ret) | |
1927 | goto error; | |
1928 | } | |
1929 | ||
0b86a832 CM |
1930 | search_start = stripe_align(root, search_start); |
1931 | ins->objectid = search_start; | |
1932 | ins->offset = num_bytes; | |
e37c9e69 | 1933 | |
db94535d | 1934 | if (ins->objectid + num_bytes >= search_end) |
cf67582b | 1935 | goto enospc; |
0b86a832 CM |
1936 | |
1937 | if (ins->objectid + num_bytes > | |
1938 | block_group->key.objectid + block_group->key.offset) { | |
e19caa5f CM |
1939 | search_start = block_group->key.objectid + |
1940 | block_group->key.offset; | |
1941 | goto new_group; | |
1942 | } | |
0b86a832 | 1943 | |
1a5bc167 | 1944 | if (test_range_bit(&info->extent_ins, ins->objectid, |
db94535d CM |
1945 | ins->objectid + num_bytes -1, EXTENT_LOCKED, 0)) { |
1946 | search_start = ins->objectid + num_bytes; | |
1a5bc167 CM |
1947 | goto new_group; |
1948 | } | |
0b86a832 | 1949 | |
1a5bc167 | 1950 | if (test_range_bit(&info->pinned_extents, ins->objectid, |
db94535d CM |
1951 | ins->objectid + num_bytes -1, EXTENT_DIRTY, 0)) { |
1952 | search_start = ins->objectid + num_bytes; | |
1a5bc167 | 1953 | goto new_group; |
fec577fb | 1954 | } |
0b86a832 | 1955 | |
db94535d | 1956 | if (exclude_nr > 0 && (ins->objectid + num_bytes > exclude_start && |
f2654de4 CM |
1957 | ins->objectid < exclude_start + exclude_nr)) { |
1958 | search_start = exclude_start + exclude_nr; | |
1959 | goto new_group; | |
1960 | } | |
0b86a832 | 1961 | |
6324fbf3 | 1962 | if (!(data & BTRFS_BLOCK_GROUP_DATA)) { |
5276aeda | 1963 | block_group = btrfs_lookup_block_group(info, ins->objectid); |
26b8003f CM |
1964 | if (block_group) |
1965 | trans->block_group = block_group; | |
f2458e1d | 1966 | } |
db94535d | 1967 | ins->offset = num_bytes; |
239b14b3 CM |
1968 | if (last_ptr) { |
1969 | *last_ptr = ins->objectid + ins->offset; | |
1970 | if (*last_ptr == | |
1971 | btrfs_super_total_bytes(&root->fs_info->super_copy)) { | |
1972 | *last_ptr = 0; | |
1973 | } | |
1974 | } | |
fec577fb | 1975 | return 0; |
be744175 CM |
1976 | |
1977 | new_group: | |
db94535d | 1978 | if (search_start + num_bytes >= search_end) { |
cf67582b | 1979 | enospc: |
be744175 | 1980 | search_start = orig_search_start; |
fbdc762b CM |
1981 | if (full_scan) { |
1982 | ret = -ENOSPC; | |
1983 | goto error; | |
1984 | } | |
6702ed49 CM |
1985 | if (wrapped) { |
1986 | if (!full_scan) | |
1987 | total_needed -= empty_size; | |
fbdc762b | 1988 | full_scan = 1; |
6702ed49 | 1989 | } else |
fbdc762b | 1990 | wrapped = 1; |
be744175 | 1991 | } |
0ef3e66b | 1992 | block_group = btrfs_lookup_first_block_group(info, search_start); |
fbdc762b | 1993 | cond_resched(); |
c286ac48 | 1994 | block_group = btrfs_find_block_group(root, block_group, |
1a2b2ac7 | 1995 | search_start, data, 0); |
be744175 CM |
1996 | goto check_failed; |
1997 | ||
0f70abe2 | 1998 | error: |
0f70abe2 | 1999 | return ret; |
fec577fb | 2000 | } |
ec44a35c | 2001 | |
e6dcd2dc CM |
2002 | static int __btrfs_reserve_extent(struct btrfs_trans_handle *trans, |
2003 | struct btrfs_root *root, | |
2004 | u64 num_bytes, u64 min_alloc_size, | |
2005 | u64 empty_size, u64 hint_byte, | |
2006 | u64 search_end, struct btrfs_key *ins, | |
2007 | u64 data) | |
fec577fb CM |
2008 | { |
2009 | int ret; | |
fbdc762b | 2010 | u64 search_start = 0; |
8790d502 | 2011 | u64 alloc_profile; |
1261ec42 | 2012 | struct btrfs_fs_info *info = root->fs_info; |
925baedd | 2013 | |
6324fbf3 | 2014 | if (data) { |
8790d502 CM |
2015 | alloc_profile = info->avail_data_alloc_bits & |
2016 | info->data_alloc_profile; | |
2017 | data = BTRFS_BLOCK_GROUP_DATA | alloc_profile; | |
6324fbf3 | 2018 | } else if (root == root->fs_info->chunk_root) { |
8790d502 CM |
2019 | alloc_profile = info->avail_system_alloc_bits & |
2020 | info->system_alloc_profile; | |
2021 | data = BTRFS_BLOCK_GROUP_SYSTEM | alloc_profile; | |
6324fbf3 | 2022 | } else { |
8790d502 CM |
2023 | alloc_profile = info->avail_metadata_alloc_bits & |
2024 | info->metadata_alloc_profile; | |
2025 | data = BTRFS_BLOCK_GROUP_METADATA | alloc_profile; | |
6324fbf3 | 2026 | } |
98d20f67 | 2027 | again: |
a061fc8d | 2028 | data = reduce_alloc_profile(root, data); |
0ef3e66b CM |
2029 | /* |
2030 | * the only place that sets empty_size is btrfs_realloc_node, which | |
2031 | * is not called recursively on allocations | |
2032 | */ | |
2033 | if (empty_size || root->ref_cows) { | |
593060d7 | 2034 | if (!(data & BTRFS_BLOCK_GROUP_METADATA)) { |
6324fbf3 | 2035 | ret = do_chunk_alloc(trans, root->fs_info->extent_root, |
0ef3e66b CM |
2036 | 2 * 1024 * 1024, |
2037 | BTRFS_BLOCK_GROUP_METADATA | | |
2038 | (info->metadata_alloc_profile & | |
2039 | info->avail_metadata_alloc_bits), 0); | |
6324fbf3 CM |
2040 | BUG_ON(ret); |
2041 | } | |
2042 | ret = do_chunk_alloc(trans, root->fs_info->extent_root, | |
0ef3e66b | 2043 | num_bytes + 2 * 1024 * 1024, data, 0); |
6324fbf3 CM |
2044 | BUG_ON(ret); |
2045 | } | |
0b86a832 | 2046 | |
db94535d CM |
2047 | WARN_ON(num_bytes < root->sectorsize); |
2048 | ret = find_free_extent(trans, root, num_bytes, empty_size, | |
2049 | search_start, search_end, hint_byte, ins, | |
26b8003f CM |
2050 | trans->alloc_exclude_start, |
2051 | trans->alloc_exclude_nr, data); | |
3b951516 | 2052 | |
98d20f67 CM |
2053 | if (ret == -ENOSPC && num_bytes > min_alloc_size) { |
2054 | num_bytes = num_bytes >> 1; | |
2055 | num_bytes = max(num_bytes, min_alloc_size); | |
0ef3e66b CM |
2056 | do_chunk_alloc(trans, root->fs_info->extent_root, |
2057 | num_bytes, data, 1); | |
98d20f67 CM |
2058 | goto again; |
2059 | } | |
ec44a35c CM |
2060 | if (ret) { |
2061 | printk("allocation failed flags %Lu\n", data); | |
925baedd | 2062 | BUG(); |
925baedd | 2063 | } |
e6dcd2dc CM |
2064 | clear_extent_dirty(&root->fs_info->free_space_cache, |
2065 | ins->objectid, ins->objectid + ins->offset - 1, | |
2066 | GFP_NOFS); | |
2067 | return 0; | |
2068 | } | |
2069 | ||
2070 | int btrfs_reserve_extent(struct btrfs_trans_handle *trans, | |
2071 | struct btrfs_root *root, | |
2072 | u64 num_bytes, u64 min_alloc_size, | |
2073 | u64 empty_size, u64 hint_byte, | |
2074 | u64 search_end, struct btrfs_key *ins, | |
2075 | u64 data) | |
2076 | { | |
2077 | int ret; | |
2078 | maybe_lock_mutex(root); | |
2079 | ret = __btrfs_reserve_extent(trans, root, num_bytes, min_alloc_size, | |
2080 | empty_size, hint_byte, search_end, ins, | |
2081 | data); | |
2082 | maybe_unlock_mutex(root); | |
2083 | return ret; | |
2084 | } | |
2085 | ||
2086 | static int __btrfs_alloc_reserved_extent(struct btrfs_trans_handle *trans, | |
2087 | struct btrfs_root *root, | |
2088 | u64 root_objectid, u64 ref_generation, | |
2089 | u64 owner, u64 owner_offset, | |
2090 | struct btrfs_key *ins) | |
2091 | { | |
2092 | int ret; | |
2093 | int pending_ret; | |
2094 | u64 super_used; | |
2095 | u64 root_used; | |
2096 | u64 num_bytes = ins->offset; | |
2097 | u32 sizes[2]; | |
2098 | struct btrfs_fs_info *info = root->fs_info; | |
2099 | struct btrfs_root *extent_root = info->extent_root; | |
2100 | struct btrfs_extent_item *extent_item; | |
2101 | struct btrfs_extent_ref *ref; | |
2102 | struct btrfs_path *path; | |
2103 | struct btrfs_key keys[2]; | |
fec577fb | 2104 | |
58176a96 | 2105 | /* block accounting for super block */ |
a2135011 | 2106 | spin_lock_irq(&info->delalloc_lock); |
db94535d CM |
2107 | super_used = btrfs_super_bytes_used(&info->super_copy); |
2108 | btrfs_set_super_bytes_used(&info->super_copy, super_used + num_bytes); | |
a2135011 | 2109 | spin_unlock_irq(&info->delalloc_lock); |
26b8003f | 2110 | |
58176a96 | 2111 | /* block accounting for root item */ |
db94535d CM |
2112 | root_used = btrfs_root_used(&root->root_item); |
2113 | btrfs_set_root_used(&root->root_item, root_used + num_bytes); | |
58176a96 | 2114 | |
26b8003f | 2115 | if (root == extent_root) { |
1a5bc167 CM |
2116 | set_extent_bits(&root->fs_info->extent_ins, ins->objectid, |
2117 | ins->objectid + ins->offset - 1, | |
2118 | EXTENT_LOCKED, GFP_NOFS); | |
26b8003f CM |
2119 | goto update_block; |
2120 | } | |
2121 | ||
47e4bb98 CM |
2122 | memcpy(&keys[0], ins, sizeof(*ins)); |
2123 | keys[1].offset = hash_extent_ref(root_objectid, ref_generation, | |
2124 | owner, owner_offset); | |
2125 | keys[1].objectid = ins->objectid; | |
2126 | keys[1].type = BTRFS_EXTENT_REF_KEY; | |
2127 | sizes[0] = sizeof(*extent_item); | |
2128 | sizes[1] = sizeof(*ref); | |
7bb86316 CM |
2129 | |
2130 | path = btrfs_alloc_path(); | |
2131 | BUG_ON(!path); | |
47e4bb98 CM |
2132 | |
2133 | ret = btrfs_insert_empty_items(trans, extent_root, path, keys, | |
2134 | sizes, 2); | |
26b8003f | 2135 | |
ccd467d6 | 2136 | BUG_ON(ret); |
47e4bb98 CM |
2137 | extent_item = btrfs_item_ptr(path->nodes[0], path->slots[0], |
2138 | struct btrfs_extent_item); | |
2139 | btrfs_set_extent_refs(path->nodes[0], extent_item, 1); | |
2140 | ref = btrfs_item_ptr(path->nodes[0], path->slots[0] + 1, | |
2141 | struct btrfs_extent_ref); | |
2142 | ||
2143 | btrfs_set_ref_root(path->nodes[0], ref, root_objectid); | |
2144 | btrfs_set_ref_generation(path->nodes[0], ref, ref_generation); | |
2145 | btrfs_set_ref_objectid(path->nodes[0], ref, owner); | |
2146 | btrfs_set_ref_offset(path->nodes[0], ref, owner_offset); | |
2147 | ||
2148 | btrfs_mark_buffer_dirty(path->nodes[0]); | |
2149 | ||
2150 | trans->alloc_exclude_start = 0; | |
2151 | trans->alloc_exclude_nr = 0; | |
7bb86316 | 2152 | btrfs_free_path(path); |
e089f05c | 2153 | finish_current_insert(trans, extent_root); |
e20d96d6 | 2154 | pending_ret = del_pending_extents(trans, extent_root); |
f510cfec | 2155 | |
925baedd CM |
2156 | if (ret) |
2157 | goto out; | |
e37c9e69 | 2158 | if (pending_ret) { |
925baedd CM |
2159 | ret = pending_ret; |
2160 | goto out; | |
e37c9e69 | 2161 | } |
26b8003f CM |
2162 | |
2163 | update_block: | |
0b86a832 | 2164 | ret = update_block_group(trans, root, ins->objectid, ins->offset, 1, 0); |
f5947066 CM |
2165 | if (ret) { |
2166 | printk("update block group failed for %Lu %Lu\n", | |
2167 | ins->objectid, ins->offset); | |
2168 | BUG(); | |
2169 | } | |
925baedd | 2170 | out: |
e6dcd2dc CM |
2171 | return ret; |
2172 | } | |
2173 | ||
2174 | int btrfs_alloc_reserved_extent(struct btrfs_trans_handle *trans, | |
2175 | struct btrfs_root *root, | |
2176 | u64 root_objectid, u64 ref_generation, | |
2177 | u64 owner, u64 owner_offset, | |
2178 | struct btrfs_key *ins) | |
2179 | { | |
2180 | int ret; | |
2181 | maybe_lock_mutex(root); | |
2182 | ret = __btrfs_alloc_reserved_extent(trans, root, root_objectid, | |
2183 | ref_generation, owner, | |
2184 | owner_offset, ins); | |
2185 | maybe_unlock_mutex(root); | |
2186 | return ret; | |
2187 | } | |
2188 | /* | |
2189 | * finds a free extent and does all the dirty work required for allocation | |
2190 | * returns the key for the extent through ins, and a tree buffer for | |
2191 | * the first block of the extent through buf. | |
2192 | * | |
2193 | * returns 0 if everything worked, non-zero otherwise. | |
2194 | */ | |
2195 | int btrfs_alloc_extent(struct btrfs_trans_handle *trans, | |
2196 | struct btrfs_root *root, | |
2197 | u64 num_bytes, u64 min_alloc_size, | |
2198 | u64 root_objectid, u64 ref_generation, | |
2199 | u64 owner, u64 owner_offset, | |
2200 | u64 empty_size, u64 hint_byte, | |
2201 | u64 search_end, struct btrfs_key *ins, u64 data) | |
2202 | { | |
2203 | int ret; | |
2204 | ||
2205 | maybe_lock_mutex(root); | |
2206 | ||
2207 | ret = __btrfs_reserve_extent(trans, root, num_bytes, | |
2208 | min_alloc_size, empty_size, hint_byte, | |
2209 | search_end, ins, data); | |
2210 | BUG_ON(ret); | |
2211 | ret = __btrfs_alloc_reserved_extent(trans, root, root_objectid, | |
2212 | ref_generation, owner, | |
2213 | owner_offset, ins); | |
2214 | BUG_ON(ret); | |
2215 | ||
925baedd CM |
2216 | maybe_unlock_mutex(root); |
2217 | return ret; | |
fec577fb | 2218 | } |
fec577fb CM |
2219 | /* |
2220 | * helper function to allocate a block for a given tree | |
2221 | * returns the tree buffer or NULL. | |
2222 | */ | |
5f39d397 | 2223 | struct extent_buffer *btrfs_alloc_free_block(struct btrfs_trans_handle *trans, |
7bb86316 CM |
2224 | struct btrfs_root *root, |
2225 | u32 blocksize, | |
2226 | u64 root_objectid, | |
2227 | u64 ref_generation, | |
2228 | u64 first_objectid, | |
2229 | int level, | |
2230 | u64 hint, | |
5f39d397 | 2231 | u64 empty_size) |
fec577fb | 2232 | { |
e2fa7227 | 2233 | struct btrfs_key ins; |
fec577fb | 2234 | int ret; |
5f39d397 | 2235 | struct extent_buffer *buf; |
fec577fb | 2236 | |
98d20f67 | 2237 | ret = btrfs_alloc_extent(trans, root, blocksize, blocksize, |
7bb86316 | 2238 | root_objectid, ref_generation, |
f6dbff55 | 2239 | level, first_objectid, empty_size, hint, |
db94535d | 2240 | (u64)-1, &ins, 0); |
fec577fb | 2241 | if (ret) { |
54aa1f4d CM |
2242 | BUG_ON(ret > 0); |
2243 | return ERR_PTR(ret); | |
fec577fb | 2244 | } |
db94535d | 2245 | buf = btrfs_find_create_tree_block(root, ins.objectid, blocksize); |
54aa1f4d | 2246 | if (!buf) { |
7bb86316 CM |
2247 | btrfs_free_extent(trans, root, ins.objectid, blocksize, |
2248 | root->root_key.objectid, ref_generation, | |
2249 | 0, 0, 0); | |
54aa1f4d CM |
2250 | return ERR_PTR(-ENOMEM); |
2251 | } | |
55c69072 | 2252 | btrfs_set_header_generation(buf, trans->transid); |
925baedd | 2253 | btrfs_tree_lock(buf); |
55c69072 | 2254 | clean_tree_block(trans, root, buf); |
5f39d397 | 2255 | btrfs_set_buffer_uptodate(buf); |
55c69072 CM |
2256 | |
2257 | if (PageDirty(buf->first_page)) { | |
2258 | printk("page %lu dirty\n", buf->first_page->index); | |
2259 | WARN_ON(1); | |
2260 | } | |
2261 | ||
5f39d397 CM |
2262 | set_extent_dirty(&trans->transaction->dirty_pages, buf->start, |
2263 | buf->start + buf->len - 1, GFP_NOFS); | |
d3c2fdcf | 2264 | trans->blocks_used++; |
fec577fb CM |
2265 | return buf; |
2266 | } | |
a28ec197 | 2267 | |
31153d81 YZ |
2268 | static int noinline drop_leaf_ref_no_cache(struct btrfs_trans_handle *trans, |
2269 | struct btrfs_root *root, | |
2270 | struct extent_buffer *leaf) | |
6407bf6d | 2271 | { |
7bb86316 CM |
2272 | u64 leaf_owner; |
2273 | u64 leaf_generation; | |
5f39d397 | 2274 | struct btrfs_key key; |
6407bf6d CM |
2275 | struct btrfs_file_extent_item *fi; |
2276 | int i; | |
2277 | int nritems; | |
2278 | int ret; | |
2279 | ||
5f39d397 CM |
2280 | BUG_ON(!btrfs_is_leaf(leaf)); |
2281 | nritems = btrfs_header_nritems(leaf); | |
7bb86316 CM |
2282 | leaf_owner = btrfs_header_owner(leaf); |
2283 | leaf_generation = btrfs_header_generation(leaf); | |
2284 | ||
4a096752 CM |
2285 | mutex_unlock(&root->fs_info->alloc_mutex); |
2286 | ||
6407bf6d | 2287 | for (i = 0; i < nritems; i++) { |
db94535d | 2288 | u64 disk_bytenr; |
e34a5b4f | 2289 | cond_resched(); |
5f39d397 CM |
2290 | |
2291 | btrfs_item_key_to_cpu(leaf, &key, i); | |
2292 | if (btrfs_key_type(&key) != BTRFS_EXTENT_DATA_KEY) | |
6407bf6d CM |
2293 | continue; |
2294 | fi = btrfs_item_ptr(leaf, i, struct btrfs_file_extent_item); | |
5f39d397 CM |
2295 | if (btrfs_file_extent_type(leaf, fi) == |
2296 | BTRFS_FILE_EXTENT_INLINE) | |
236454df | 2297 | continue; |
6407bf6d CM |
2298 | /* |
2299 | * FIXME make sure to insert a trans record that | |
2300 | * repeats the snapshot del on crash | |
2301 | */ | |
db94535d CM |
2302 | disk_bytenr = btrfs_file_extent_disk_bytenr(leaf, fi); |
2303 | if (disk_bytenr == 0) | |
3a686375 | 2304 | continue; |
4a096752 CM |
2305 | |
2306 | mutex_lock(&root->fs_info->alloc_mutex); | |
925baedd | 2307 | ret = __btrfs_free_extent(trans, root, disk_bytenr, |
7bb86316 CM |
2308 | btrfs_file_extent_disk_num_bytes(leaf, fi), |
2309 | leaf_owner, leaf_generation, | |
2310 | key.objectid, key.offset, 0); | |
4a096752 | 2311 | mutex_unlock(&root->fs_info->alloc_mutex); |
6407bf6d CM |
2312 | BUG_ON(ret); |
2313 | } | |
4a096752 CM |
2314 | |
2315 | mutex_lock(&root->fs_info->alloc_mutex); | |
6407bf6d CM |
2316 | return 0; |
2317 | } | |
2318 | ||
31153d81 YZ |
2319 | static int noinline drop_leaf_ref(struct btrfs_trans_handle *trans, |
2320 | struct btrfs_root *root, | |
2321 | struct btrfs_leaf_ref *ref) | |
2322 | { | |
2323 | int i; | |
2324 | int ret; | |
2325 | struct btrfs_extent_info *info = ref->extents; | |
2326 | ||
2327 | mutex_unlock(&root->fs_info->alloc_mutex); | |
2328 | for (i = 0; i < ref->nritems; i++) { | |
2329 | mutex_lock(&root->fs_info->alloc_mutex); | |
2330 | ret = __btrfs_free_extent(trans, root, | |
2331 | info->bytenr, info->num_bytes, | |
2332 | ref->owner, ref->generation, | |
2333 | info->objectid, info->offset, 0); | |
2334 | mutex_unlock(&root->fs_info->alloc_mutex); | |
2335 | BUG_ON(ret); | |
2336 | info++; | |
2337 | } | |
2338 | mutex_lock(&root->fs_info->alloc_mutex); | |
2339 | ||
2340 | return 0; | |
2341 | } | |
2342 | ||
98ed5174 | 2343 | static void noinline reada_walk_down(struct btrfs_root *root, |
bea495e5 CM |
2344 | struct extent_buffer *node, |
2345 | int slot) | |
e011599b | 2346 | { |
db94535d | 2347 | u64 bytenr; |
bea495e5 CM |
2348 | u64 last = 0; |
2349 | u32 nritems; | |
e011599b | 2350 | u32 refs; |
db94535d | 2351 | u32 blocksize; |
bea495e5 CM |
2352 | int ret; |
2353 | int i; | |
2354 | int level; | |
2355 | int skipped = 0; | |
e011599b | 2356 | |
5f39d397 | 2357 | nritems = btrfs_header_nritems(node); |
db94535d | 2358 | level = btrfs_header_level(node); |
bea495e5 CM |
2359 | if (level) |
2360 | return; | |
2361 | ||
2362 | for (i = slot; i < nritems && skipped < 32; i++) { | |
db94535d | 2363 | bytenr = btrfs_node_blockptr(node, i); |
bea495e5 CM |
2364 | if (last && ((bytenr > last && bytenr - last > 32 * 1024) || |
2365 | (last > bytenr && last - bytenr > 32 * 1024))) { | |
2366 | skipped++; | |
e011599b | 2367 | continue; |
bea495e5 CM |
2368 | } |
2369 | blocksize = btrfs_level_size(root, level - 1); | |
2370 | if (i != slot) { | |
2371 | ret = lookup_extent_ref(NULL, root, bytenr, | |
2372 | blocksize, &refs); | |
2373 | BUG_ON(ret); | |
2374 | if (refs != 1) { | |
2375 | skipped++; | |
2376 | continue; | |
2377 | } | |
2378 | } | |
ca7a79ad CM |
2379 | ret = readahead_tree_block(root, bytenr, blocksize, |
2380 | btrfs_node_ptr_generation(node, i)); | |
bea495e5 | 2381 | last = bytenr + blocksize; |
409eb95d | 2382 | cond_resched(); |
e011599b CM |
2383 | if (ret) |
2384 | break; | |
2385 | } | |
2386 | } | |
2387 | ||
333db94c CM |
2388 | int drop_snap_lookup_refcount(struct btrfs_root *root, u64 start, u64 len, |
2389 | u32 *refs) | |
2390 | { | |
017e5369 | 2391 | int ret; |
333db94c | 2392 | mutex_unlock(&root->fs_info->alloc_mutex); |
017e5369 | 2393 | ret = lookup_extent_ref(NULL, root, start, len, refs); |
e7a84565 | 2394 | cond_resched(); |
333db94c | 2395 | mutex_lock(&root->fs_info->alloc_mutex); |
017e5369 | 2396 | return ret; |
333db94c CM |
2397 | } |
2398 | ||
9aca1d51 CM |
2399 | /* |
2400 | * helper function for drop_snapshot, this walks down the tree dropping ref | |
2401 | * counts as it goes. | |
2402 | */ | |
98ed5174 CM |
2403 | static int noinline walk_down_tree(struct btrfs_trans_handle *trans, |
2404 | struct btrfs_root *root, | |
2405 | struct btrfs_path *path, int *level) | |
20524f02 | 2406 | { |
7bb86316 CM |
2407 | u64 root_owner; |
2408 | u64 root_gen; | |
2409 | u64 bytenr; | |
ca7a79ad | 2410 | u64 ptr_gen; |
5f39d397 CM |
2411 | struct extent_buffer *next; |
2412 | struct extent_buffer *cur; | |
7bb86316 | 2413 | struct extent_buffer *parent; |
31153d81 | 2414 | struct btrfs_leaf_ref *ref; |
db94535d | 2415 | u32 blocksize; |
20524f02 CM |
2416 | int ret; |
2417 | u32 refs; | |
2418 | ||
925baedd CM |
2419 | mutex_lock(&root->fs_info->alloc_mutex); |
2420 | ||
5caf2a00 CM |
2421 | WARN_ON(*level < 0); |
2422 | WARN_ON(*level >= BTRFS_MAX_LEVEL); | |
333db94c | 2423 | ret = drop_snap_lookup_refcount(root, path->nodes[*level]->start, |
db94535d | 2424 | path->nodes[*level]->len, &refs); |
20524f02 CM |
2425 | BUG_ON(ret); |
2426 | if (refs > 1) | |
2427 | goto out; | |
e011599b | 2428 | |
9aca1d51 CM |
2429 | /* |
2430 | * walk down to the last node level and free all the leaves | |
2431 | */ | |
6407bf6d | 2432 | while(*level >= 0) { |
5caf2a00 CM |
2433 | WARN_ON(*level < 0); |
2434 | WARN_ON(*level >= BTRFS_MAX_LEVEL); | |
20524f02 | 2435 | cur = path->nodes[*level]; |
e011599b | 2436 | |
5f39d397 | 2437 | if (btrfs_header_level(cur) != *level) |
2c90e5d6 | 2438 | WARN_ON(1); |
e011599b | 2439 | |
7518a238 | 2440 | if (path->slots[*level] >= |
5f39d397 | 2441 | btrfs_header_nritems(cur)) |
20524f02 | 2442 | break; |
6407bf6d | 2443 | if (*level == 0) { |
31153d81 | 2444 | ret = drop_leaf_ref_no_cache(trans, root, cur); |
6407bf6d CM |
2445 | BUG_ON(ret); |
2446 | break; | |
2447 | } | |
db94535d | 2448 | bytenr = btrfs_node_blockptr(cur, path->slots[*level]); |
ca7a79ad | 2449 | ptr_gen = btrfs_node_ptr_generation(cur, path->slots[*level]); |
db94535d | 2450 | blocksize = btrfs_level_size(root, *level - 1); |
925baedd | 2451 | |
333db94c | 2452 | ret = drop_snap_lookup_refcount(root, bytenr, blocksize, &refs); |
6407bf6d CM |
2453 | BUG_ON(ret); |
2454 | if (refs != 1) { | |
7bb86316 CM |
2455 | parent = path->nodes[*level]; |
2456 | root_owner = btrfs_header_owner(parent); | |
2457 | root_gen = btrfs_header_generation(parent); | |
20524f02 | 2458 | path->slots[*level]++; |
925baedd | 2459 | ret = __btrfs_free_extent(trans, root, bytenr, |
7bb86316 CM |
2460 | blocksize, root_owner, |
2461 | root_gen, 0, 0, 1); | |
20524f02 CM |
2462 | BUG_ON(ret); |
2463 | continue; | |
2464 | } | |
017e5369 | 2465 | |
31153d81 YZ |
2466 | if (*level == 1) { |
2467 | struct btrfs_key key; | |
2468 | btrfs_node_key_to_cpu(cur, &key, path->slots[*level]); | |
017e5369 | 2469 | ref = btrfs_lookup_leaf_ref(root, bytenr); |
31153d81 YZ |
2470 | if (ref) { |
2471 | ret = drop_leaf_ref(trans, root, ref); | |
2472 | BUG_ON(ret); | |
2473 | btrfs_remove_leaf_ref(root, ref); | |
2474 | btrfs_free_leaf_ref(ref); | |
2475 | *level = 0; | |
2476 | break; | |
2477 | } | |
2478 | } | |
db94535d | 2479 | next = btrfs_find_tree_block(root, bytenr, blocksize); |
1259ab75 | 2480 | if (!next || !btrfs_buffer_uptodate(next, ptr_gen)) { |
5f39d397 | 2481 | free_extent_buffer(next); |
333db94c CM |
2482 | mutex_unlock(&root->fs_info->alloc_mutex); |
2483 | ||
a74a4b97 CM |
2484 | if (path->slots[*level] == 0) |
2485 | reada_walk_down(root, cur, path->slots[*level]); | |
ca7a79ad CM |
2486 | next = read_tree_block(root, bytenr, blocksize, |
2487 | ptr_gen); | |
e7a84565 | 2488 | cond_resched(); |
925baedd | 2489 | mutex_lock(&root->fs_info->alloc_mutex); |
e9d0b13b | 2490 | |
8790d502 | 2491 | /* we've dropped the lock, double check */ |
e6dcd2dc CM |
2492 | ret = lookup_extent_ref(NULL, root, bytenr, blocksize, |
2493 | &refs); | |
e9d0b13b CM |
2494 | BUG_ON(ret); |
2495 | if (refs != 1) { | |
7bb86316 CM |
2496 | parent = path->nodes[*level]; |
2497 | root_owner = btrfs_header_owner(parent); | |
2498 | root_gen = btrfs_header_generation(parent); | |
2499 | ||
e9d0b13b | 2500 | path->slots[*level]++; |
5f39d397 | 2501 | free_extent_buffer(next); |
925baedd | 2502 | ret = __btrfs_free_extent(trans, root, bytenr, |
7bb86316 CM |
2503 | blocksize, |
2504 | root_owner, | |
2505 | root_gen, 0, 0, 1); | |
e9d0b13b CM |
2506 | BUG_ON(ret); |
2507 | continue; | |
2508 | } | |
2509 | } | |
5caf2a00 | 2510 | WARN_ON(*level <= 0); |
83e15a28 | 2511 | if (path->nodes[*level-1]) |
5f39d397 | 2512 | free_extent_buffer(path->nodes[*level-1]); |
20524f02 | 2513 | path->nodes[*level-1] = next; |
5f39d397 | 2514 | *level = btrfs_header_level(next); |
20524f02 CM |
2515 | path->slots[*level] = 0; |
2516 | } | |
2517 | out: | |
5caf2a00 CM |
2518 | WARN_ON(*level < 0); |
2519 | WARN_ON(*level >= BTRFS_MAX_LEVEL); | |
7bb86316 CM |
2520 | |
2521 | if (path->nodes[*level] == root->node) { | |
7bb86316 | 2522 | parent = path->nodes[*level]; |
31153d81 | 2523 | bytenr = path->nodes[*level]->start; |
7bb86316 CM |
2524 | } else { |
2525 | parent = path->nodes[*level + 1]; | |
31153d81 | 2526 | bytenr = btrfs_node_blockptr(parent, path->slots[*level + 1]); |
7bb86316 CM |
2527 | } |
2528 | ||
31153d81 YZ |
2529 | blocksize = btrfs_level_size(root, *level); |
2530 | root_owner = btrfs_header_owner(parent); | |
7bb86316 | 2531 | root_gen = btrfs_header_generation(parent); |
31153d81 YZ |
2532 | |
2533 | ret = __btrfs_free_extent(trans, root, bytenr, blocksize, | |
2534 | root_owner, root_gen, 0, 0, 1); | |
5f39d397 | 2535 | free_extent_buffer(path->nodes[*level]); |
20524f02 CM |
2536 | path->nodes[*level] = NULL; |
2537 | *level += 1; | |
2538 | BUG_ON(ret); | |
925baedd | 2539 | mutex_unlock(&root->fs_info->alloc_mutex); |
e7a84565 | 2540 | cond_resched(); |
20524f02 CM |
2541 | return 0; |
2542 | } | |
2543 | ||
9aca1d51 CM |
2544 | /* |
2545 | * helper for dropping snapshots. This walks back up the tree in the path | |
2546 | * to find the first node higher up where we haven't yet gone through | |
2547 | * all the slots | |
2548 | */ | |
98ed5174 CM |
2549 | static int noinline walk_up_tree(struct btrfs_trans_handle *trans, |
2550 | struct btrfs_root *root, | |
2551 | struct btrfs_path *path, int *level) | |
20524f02 | 2552 | { |
7bb86316 CM |
2553 | u64 root_owner; |
2554 | u64 root_gen; | |
2555 | struct btrfs_root_item *root_item = &root->root_item; | |
20524f02 CM |
2556 | int i; |
2557 | int slot; | |
2558 | int ret; | |
9f3a7427 | 2559 | |
234b63a0 | 2560 | for(i = *level; i < BTRFS_MAX_LEVEL - 1 && path->nodes[i]; i++) { |
20524f02 | 2561 | slot = path->slots[i]; |
5f39d397 CM |
2562 | if (slot < btrfs_header_nritems(path->nodes[i]) - 1) { |
2563 | struct extent_buffer *node; | |
2564 | struct btrfs_disk_key disk_key; | |
2565 | node = path->nodes[i]; | |
20524f02 CM |
2566 | path->slots[i]++; |
2567 | *level = i; | |
9f3a7427 | 2568 | WARN_ON(*level == 0); |
5f39d397 | 2569 | btrfs_node_key(node, &disk_key, path->slots[i]); |
9f3a7427 | 2570 | memcpy(&root_item->drop_progress, |
5f39d397 | 2571 | &disk_key, sizeof(disk_key)); |
9f3a7427 | 2572 | root_item->drop_level = i; |
20524f02 CM |
2573 | return 0; |
2574 | } else { | |
7bb86316 CM |
2575 | if (path->nodes[*level] == root->node) { |
2576 | root_owner = root->root_key.objectid; | |
2577 | root_gen = | |
2578 | btrfs_header_generation(path->nodes[*level]); | |
2579 | } else { | |
2580 | struct extent_buffer *node; | |
2581 | node = path->nodes[*level + 1]; | |
2582 | root_owner = btrfs_header_owner(node); | |
2583 | root_gen = btrfs_header_generation(node); | |
2584 | } | |
e089f05c | 2585 | ret = btrfs_free_extent(trans, root, |
db94535d | 2586 | path->nodes[*level]->start, |
7bb86316 CM |
2587 | path->nodes[*level]->len, |
2588 | root_owner, root_gen, 0, 0, 1); | |
6407bf6d | 2589 | BUG_ON(ret); |
5f39d397 | 2590 | free_extent_buffer(path->nodes[*level]); |
83e15a28 | 2591 | path->nodes[*level] = NULL; |
20524f02 | 2592 | *level = i + 1; |
20524f02 CM |
2593 | } |
2594 | } | |
2595 | return 1; | |
2596 | } | |
2597 | ||
9aca1d51 CM |
2598 | /* |
2599 | * drop the reference count on the tree rooted at 'snap'. This traverses | |
2600 | * the tree freeing any blocks that have a ref count of zero after being | |
2601 | * decremented. | |
2602 | */ | |
e089f05c | 2603 | int btrfs_drop_snapshot(struct btrfs_trans_handle *trans, struct btrfs_root |
9f3a7427 | 2604 | *root) |
20524f02 | 2605 | { |
3768f368 | 2606 | int ret = 0; |
9aca1d51 | 2607 | int wret; |
20524f02 | 2608 | int level; |
5caf2a00 | 2609 | struct btrfs_path *path; |
20524f02 CM |
2610 | int i; |
2611 | int orig_level; | |
9f3a7427 | 2612 | struct btrfs_root_item *root_item = &root->root_item; |
20524f02 | 2613 | |
a2135011 | 2614 | WARN_ON(!mutex_is_locked(&root->fs_info->drop_mutex)); |
5caf2a00 CM |
2615 | path = btrfs_alloc_path(); |
2616 | BUG_ON(!path); | |
20524f02 | 2617 | |
5f39d397 | 2618 | level = btrfs_header_level(root->node); |
20524f02 | 2619 | orig_level = level; |
9f3a7427 CM |
2620 | if (btrfs_disk_key_objectid(&root_item->drop_progress) == 0) { |
2621 | path->nodes[level] = root->node; | |
f510cfec | 2622 | extent_buffer_get(root->node); |
9f3a7427 CM |
2623 | path->slots[level] = 0; |
2624 | } else { | |
2625 | struct btrfs_key key; | |
5f39d397 CM |
2626 | struct btrfs_disk_key found_key; |
2627 | struct extent_buffer *node; | |
6702ed49 | 2628 | |
9f3a7427 | 2629 | btrfs_disk_key_to_cpu(&key, &root_item->drop_progress); |
6702ed49 CM |
2630 | level = root_item->drop_level; |
2631 | path->lowest_level = level; | |
9f3a7427 | 2632 | wret = btrfs_search_slot(NULL, root, &key, path, 0, 0); |
6702ed49 | 2633 | if (wret < 0) { |
9f3a7427 CM |
2634 | ret = wret; |
2635 | goto out; | |
2636 | } | |
5f39d397 CM |
2637 | node = path->nodes[level]; |
2638 | btrfs_node_key(node, &found_key, path->slots[level]); | |
2639 | WARN_ON(memcmp(&found_key, &root_item->drop_progress, | |
2640 | sizeof(found_key))); | |
7d9eb12c CM |
2641 | /* |
2642 | * unlock our path, this is safe because only this | |
2643 | * function is allowed to delete this snapshot | |
2644 | */ | |
925baedd CM |
2645 | for (i = 0; i < BTRFS_MAX_LEVEL; i++) { |
2646 | if (path->nodes[i] && path->locks[i]) { | |
2647 | path->locks[i] = 0; | |
2648 | btrfs_tree_unlock(path->nodes[i]); | |
2649 | } | |
2650 | } | |
9f3a7427 | 2651 | } |
20524f02 | 2652 | while(1) { |
ab78c84d | 2653 | atomic_inc(&root->fs_info->throttle_gen); |
5caf2a00 | 2654 | wret = walk_down_tree(trans, root, path, &level); |
9aca1d51 | 2655 | if (wret > 0) |
20524f02 | 2656 | break; |
9aca1d51 CM |
2657 | if (wret < 0) |
2658 | ret = wret; | |
2659 | ||
5caf2a00 | 2660 | wret = walk_up_tree(trans, root, path, &level); |
9aca1d51 | 2661 | if (wret > 0) |
20524f02 | 2662 | break; |
9aca1d51 CM |
2663 | if (wret < 0) |
2664 | ret = wret; | |
e7a84565 CM |
2665 | if (trans->transaction->in_commit) { |
2666 | ret = -EAGAIN; | |
2667 | break; | |
2668 | } | |
017e5369 | 2669 | wake_up(&root->fs_info->transaction_throttle); |
20524f02 | 2670 | } |
83e15a28 | 2671 | for (i = 0; i <= orig_level; i++) { |
5caf2a00 | 2672 | if (path->nodes[i]) { |
5f39d397 | 2673 | free_extent_buffer(path->nodes[i]); |
0f82731f | 2674 | path->nodes[i] = NULL; |
83e15a28 | 2675 | } |
20524f02 | 2676 | } |
9f3a7427 | 2677 | out: |
5caf2a00 | 2678 | btrfs_free_path(path); |
9aca1d51 | 2679 | return ret; |
20524f02 | 2680 | } |
9078a3e1 | 2681 | |
96b5179d | 2682 | int btrfs_free_block_groups(struct btrfs_fs_info *info) |
9078a3e1 | 2683 | { |
96b5179d CM |
2684 | u64 start; |
2685 | u64 end; | |
b97f9203 | 2686 | u64 ptr; |
9078a3e1 | 2687 | int ret; |
925baedd CM |
2688 | |
2689 | mutex_lock(&info->alloc_mutex); | |
9078a3e1 | 2690 | while(1) { |
96b5179d CM |
2691 | ret = find_first_extent_bit(&info->block_group_cache, 0, |
2692 | &start, &end, (unsigned int)-1); | |
2693 | if (ret) | |
9078a3e1 | 2694 | break; |
b97f9203 Y |
2695 | ret = get_state_private(&info->block_group_cache, start, &ptr); |
2696 | if (!ret) | |
2697 | kfree((void *)(unsigned long)ptr); | |
96b5179d CM |
2698 | clear_extent_bits(&info->block_group_cache, start, |
2699 | end, (unsigned int)-1, GFP_NOFS); | |
9078a3e1 | 2700 | } |
e37c9e69 | 2701 | while(1) { |
f510cfec CM |
2702 | ret = find_first_extent_bit(&info->free_space_cache, 0, |
2703 | &start, &end, EXTENT_DIRTY); | |
2704 | if (ret) | |
e37c9e69 | 2705 | break; |
f510cfec CM |
2706 | clear_extent_dirty(&info->free_space_cache, start, |
2707 | end, GFP_NOFS); | |
e37c9e69 | 2708 | } |
925baedd | 2709 | mutex_unlock(&info->alloc_mutex); |
be744175 CM |
2710 | return 0; |
2711 | } | |
2712 | ||
8e7bf94f CM |
2713 | static unsigned long calc_ra(unsigned long start, unsigned long last, |
2714 | unsigned long nr) | |
2715 | { | |
2716 | return min(last, start + nr - 1); | |
2717 | } | |
2718 | ||
98ed5174 CM |
2719 | static int noinline relocate_inode_pages(struct inode *inode, u64 start, |
2720 | u64 len) | |
edbd8d4e CM |
2721 | { |
2722 | u64 page_start; | |
2723 | u64 page_end; | |
edbd8d4e | 2724 | unsigned long last_index; |
edbd8d4e CM |
2725 | unsigned long i; |
2726 | struct page *page; | |
d1310b2e | 2727 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; |
4313b399 | 2728 | struct file_ra_state *ra; |
8e7bf94f CM |
2729 | unsigned long total_read = 0; |
2730 | unsigned long ra_pages; | |
3eaa2885 | 2731 | struct btrfs_ordered_extent *ordered; |
a061fc8d | 2732 | struct btrfs_trans_handle *trans; |
4313b399 CM |
2733 | |
2734 | ra = kzalloc(sizeof(*ra), GFP_NOFS); | |
edbd8d4e CM |
2735 | |
2736 | mutex_lock(&inode->i_mutex); | |
4313b399 | 2737 | i = start >> PAGE_CACHE_SHIFT; |
edbd8d4e CM |
2738 | last_index = (start + len - 1) >> PAGE_CACHE_SHIFT; |
2739 | ||
8e7bf94f CM |
2740 | ra_pages = BTRFS_I(inode)->root->fs_info->bdi.ra_pages; |
2741 | ||
4313b399 | 2742 | file_ra_state_init(ra, inode->i_mapping); |
edbd8d4e | 2743 | |
4313b399 | 2744 | for (; i <= last_index; i++) { |
8e7bf94f CM |
2745 | if (total_read % ra_pages == 0) { |
2746 | btrfs_force_ra(inode->i_mapping, ra, NULL, i, | |
2747 | calc_ra(i, last_index, ra_pages)); | |
2748 | } | |
2749 | total_read++; | |
3eaa2885 CM |
2750 | again: |
2751 | if (((u64)i << PAGE_CACHE_SHIFT) > i_size_read(inode)) | |
a061fc8d | 2752 | goto truncate_racing; |
edbd8d4e | 2753 | page = grab_cache_page(inode->i_mapping, i); |
a061fc8d | 2754 | if (!page) { |
edbd8d4e | 2755 | goto out_unlock; |
a061fc8d | 2756 | } |
edbd8d4e CM |
2757 | if (!PageUptodate(page)) { |
2758 | btrfs_readpage(NULL, page); | |
2759 | lock_page(page); | |
2760 | if (!PageUptodate(page)) { | |
2761 | unlock_page(page); | |
2762 | page_cache_release(page); | |
2763 | goto out_unlock; | |
2764 | } | |
2765 | } | |
ec44a35c | 2766 | wait_on_page_writeback(page); |
3eaa2885 | 2767 | |
edbd8d4e CM |
2768 | page_start = (u64)page->index << PAGE_CACHE_SHIFT; |
2769 | page_end = page_start + PAGE_CACHE_SIZE - 1; | |
d1310b2e | 2770 | lock_extent(io_tree, page_start, page_end, GFP_NOFS); |
edbd8d4e | 2771 | |
3eaa2885 CM |
2772 | ordered = btrfs_lookup_ordered_extent(inode, page_start); |
2773 | if (ordered) { | |
2774 | unlock_extent(io_tree, page_start, page_end, GFP_NOFS); | |
2775 | unlock_page(page); | |
2776 | page_cache_release(page); | |
2777 | btrfs_start_ordered_extent(inode, ordered, 1); | |
2778 | btrfs_put_ordered_extent(ordered); | |
2779 | goto again; | |
2780 | } | |
2781 | set_page_extent_mapped(page); | |
2782 | ||
2783 | ||
d1310b2e | 2784 | set_extent_delalloc(io_tree, page_start, |
edbd8d4e | 2785 | page_end, GFP_NOFS); |
a061fc8d | 2786 | set_page_dirty(page); |
edbd8d4e | 2787 | |
d1310b2e | 2788 | unlock_extent(io_tree, page_start, page_end, GFP_NOFS); |
edbd8d4e CM |
2789 | unlock_page(page); |
2790 | page_cache_release(page); | |
2791 | } | |
2792 | ||
2793 | out_unlock: | |
3eaa2885 CM |
2794 | /* we have to start the IO in order to get the ordered extents |
2795 | * instantiated. This allows the relocation to code to wait | |
2796 | * for all the ordered extents to hit the disk. | |
2797 | * | |
2798 | * Otherwise, it would constantly loop over the same extents | |
2799 | * because the old ones don't get deleted until the IO is | |
2800 | * started | |
2801 | */ | |
2802 | btrfs_fdatawrite_range(inode->i_mapping, start, start + len - 1, | |
2803 | WB_SYNC_NONE); | |
ec44a35c | 2804 | kfree(ra); |
a061fc8d CM |
2805 | trans = btrfs_start_transaction(BTRFS_I(inode)->root, 1); |
2806 | if (trans) { | |
a061fc8d CM |
2807 | btrfs_end_transaction(trans, BTRFS_I(inode)->root); |
2808 | mark_inode_dirty(inode); | |
2809 | } | |
edbd8d4e CM |
2810 | mutex_unlock(&inode->i_mutex); |
2811 | return 0; | |
a061fc8d CM |
2812 | |
2813 | truncate_racing: | |
2814 | vmtruncate(inode, inode->i_size); | |
2815 | balance_dirty_pages_ratelimited_nr(inode->i_mapping, | |
2816 | total_read); | |
2817 | goto out_unlock; | |
edbd8d4e CM |
2818 | } |
2819 | ||
bf4ef679 CM |
2820 | /* |
2821 | * The back references tell us which tree holds a ref on a block, | |
2822 | * but it is possible for the tree root field in the reference to | |
2823 | * reflect the original root before a snapshot was made. In this | |
2824 | * case we should search through all the children of a given root | |
2825 | * to find potential holders of references on a block. | |
2826 | * | |
2827 | * Instead, we do something a little less fancy and just search | |
2828 | * all the roots for a given key/block combination. | |
2829 | */ | |
2830 | static int find_root_for_ref(struct btrfs_root *root, | |
2831 | struct btrfs_path *path, | |
2832 | struct btrfs_key *key0, | |
2833 | int level, | |
2834 | int file_key, | |
2835 | struct btrfs_root **found_root, | |
2836 | u64 bytenr) | |
2837 | { | |
2838 | struct btrfs_key root_location; | |
2839 | struct btrfs_root *cur_root = *found_root; | |
2840 | struct btrfs_file_extent_item *file_extent; | |
2841 | u64 root_search_start = BTRFS_FS_TREE_OBJECTID; | |
2842 | u64 found_bytenr; | |
2843 | int ret; | |
bf4ef679 CM |
2844 | |
2845 | root_location.offset = (u64)-1; | |
2846 | root_location.type = BTRFS_ROOT_ITEM_KEY; | |
2847 | path->lowest_level = level; | |
2848 | path->reada = 0; | |
2849 | while(1) { | |
2850 | ret = btrfs_search_slot(NULL, cur_root, key0, path, 0, 0); | |
2851 | found_bytenr = 0; | |
2852 | if (ret == 0 && file_key) { | |
2853 | struct extent_buffer *leaf = path->nodes[0]; | |
2854 | file_extent = btrfs_item_ptr(leaf, path->slots[0], | |
2855 | struct btrfs_file_extent_item); | |
2856 | if (btrfs_file_extent_type(leaf, file_extent) == | |
2857 | BTRFS_FILE_EXTENT_REG) { | |
2858 | found_bytenr = | |
2859 | btrfs_file_extent_disk_bytenr(leaf, | |
2860 | file_extent); | |
2861 | } | |
323da79c | 2862 | } else if (!file_key) { |
bf4ef679 CM |
2863 | if (path->nodes[level]) |
2864 | found_bytenr = path->nodes[level]->start; | |
2865 | } | |
2866 | ||
bf4ef679 CM |
2867 | btrfs_release_path(cur_root, path); |
2868 | ||
2869 | if (found_bytenr == bytenr) { | |
2870 | *found_root = cur_root; | |
2871 | ret = 0; | |
2872 | goto out; | |
2873 | } | |
2874 | ret = btrfs_search_root(root->fs_info->tree_root, | |
2875 | root_search_start, &root_search_start); | |
2876 | if (ret) | |
2877 | break; | |
2878 | ||
2879 | root_location.objectid = root_search_start; | |
2880 | cur_root = btrfs_read_fs_root_no_name(root->fs_info, | |
2881 | &root_location); | |
2882 | if (!cur_root) { | |
2883 | ret = 1; | |
2884 | break; | |
2885 | } | |
2886 | } | |
2887 | out: | |
2888 | path->lowest_level = 0; | |
2889 | return ret; | |
2890 | } | |
2891 | ||
4313b399 CM |
2892 | /* |
2893 | * note, this releases the path | |
2894 | */ | |
98ed5174 | 2895 | static int noinline relocate_one_reference(struct btrfs_root *extent_root, |
edbd8d4e | 2896 | struct btrfs_path *path, |
0ef3e66b CM |
2897 | struct btrfs_key *extent_key, |
2898 | u64 *last_file_objectid, | |
2899 | u64 *last_file_offset, | |
2900 | u64 *last_file_root, | |
2901 | u64 last_extent) | |
edbd8d4e CM |
2902 | { |
2903 | struct inode *inode; | |
2904 | struct btrfs_root *found_root; | |
bf4ef679 CM |
2905 | struct btrfs_key root_location; |
2906 | struct btrfs_key found_key; | |
4313b399 CM |
2907 | struct btrfs_extent_ref *ref; |
2908 | u64 ref_root; | |
2909 | u64 ref_gen; | |
2910 | u64 ref_objectid; | |
2911 | u64 ref_offset; | |
edbd8d4e | 2912 | int ret; |
bf4ef679 | 2913 | int level; |
edbd8d4e | 2914 | |
7d9eb12c CM |
2915 | WARN_ON(!mutex_is_locked(&extent_root->fs_info->alloc_mutex)); |
2916 | ||
4313b399 CM |
2917 | ref = btrfs_item_ptr(path->nodes[0], path->slots[0], |
2918 | struct btrfs_extent_ref); | |
2919 | ref_root = btrfs_ref_root(path->nodes[0], ref); | |
2920 | ref_gen = btrfs_ref_generation(path->nodes[0], ref); | |
2921 | ref_objectid = btrfs_ref_objectid(path->nodes[0], ref); | |
2922 | ref_offset = btrfs_ref_offset(path->nodes[0], ref); | |
2923 | btrfs_release_path(extent_root, path); | |
2924 | ||
bf4ef679 | 2925 | root_location.objectid = ref_root; |
edbd8d4e | 2926 | if (ref_gen == 0) |
bf4ef679 | 2927 | root_location.offset = 0; |
edbd8d4e | 2928 | else |
bf4ef679 CM |
2929 | root_location.offset = (u64)-1; |
2930 | root_location.type = BTRFS_ROOT_ITEM_KEY; | |
edbd8d4e CM |
2931 | |
2932 | found_root = btrfs_read_fs_root_no_name(extent_root->fs_info, | |
bf4ef679 | 2933 | &root_location); |
edbd8d4e | 2934 | BUG_ON(!found_root); |
7d9eb12c | 2935 | mutex_unlock(&extent_root->fs_info->alloc_mutex); |
edbd8d4e CM |
2936 | |
2937 | if (ref_objectid >= BTRFS_FIRST_FREE_OBJECTID) { | |
bf4ef679 CM |
2938 | found_key.objectid = ref_objectid; |
2939 | found_key.type = BTRFS_EXTENT_DATA_KEY; | |
2940 | found_key.offset = ref_offset; | |
2941 | level = 0; | |
2942 | ||
0ef3e66b CM |
2943 | if (last_extent == extent_key->objectid && |
2944 | *last_file_objectid == ref_objectid && | |
2945 | *last_file_offset == ref_offset && | |
2946 | *last_file_root == ref_root) | |
2947 | goto out; | |
2948 | ||
bf4ef679 CM |
2949 | ret = find_root_for_ref(extent_root, path, &found_key, |
2950 | level, 1, &found_root, | |
2951 | extent_key->objectid); | |
2952 | ||
2953 | if (ret) | |
2954 | goto out; | |
2955 | ||
0ef3e66b CM |
2956 | if (last_extent == extent_key->objectid && |
2957 | *last_file_objectid == ref_objectid && | |
2958 | *last_file_offset == ref_offset && | |
2959 | *last_file_root == ref_root) | |
2960 | goto out; | |
2961 | ||
edbd8d4e CM |
2962 | inode = btrfs_iget_locked(extent_root->fs_info->sb, |
2963 | ref_objectid, found_root); | |
2964 | if (inode->i_state & I_NEW) { | |
2965 | /* the inode and parent dir are two different roots */ | |
2966 | BTRFS_I(inode)->root = found_root; | |
2967 | BTRFS_I(inode)->location.objectid = ref_objectid; | |
2968 | BTRFS_I(inode)->location.type = BTRFS_INODE_ITEM_KEY; | |
2969 | BTRFS_I(inode)->location.offset = 0; | |
2970 | btrfs_read_locked_inode(inode); | |
2971 | unlock_new_inode(inode); | |
2972 | ||
2973 | } | |
2974 | /* this can happen if the reference is not against | |
2975 | * the latest version of the tree root | |
2976 | */ | |
7d9eb12c | 2977 | if (is_bad_inode(inode)) |
edbd8d4e | 2978 | goto out; |
7d9eb12c | 2979 | |
0ef3e66b CM |
2980 | *last_file_objectid = inode->i_ino; |
2981 | *last_file_root = found_root->root_key.objectid; | |
2982 | *last_file_offset = ref_offset; | |
2983 | ||
edbd8d4e | 2984 | relocate_inode_pages(inode, ref_offset, extent_key->offset); |
edbd8d4e | 2985 | iput(inode); |
edbd8d4e CM |
2986 | } else { |
2987 | struct btrfs_trans_handle *trans; | |
edbd8d4e | 2988 | struct extent_buffer *eb; |
7d9eb12c | 2989 | int needs_lock = 0; |
edbd8d4e | 2990 | |
edbd8d4e | 2991 | eb = read_tree_block(found_root, extent_key->objectid, |
ca7a79ad | 2992 | extent_key->offset, 0); |
925baedd | 2993 | btrfs_tree_lock(eb); |
edbd8d4e CM |
2994 | level = btrfs_header_level(eb); |
2995 | ||
2996 | if (level == 0) | |
2997 | btrfs_item_key_to_cpu(eb, &found_key, 0); | |
2998 | else | |
2999 | btrfs_node_key_to_cpu(eb, &found_key, 0); | |
3000 | ||
925baedd | 3001 | btrfs_tree_unlock(eb); |
edbd8d4e CM |
3002 | free_extent_buffer(eb); |
3003 | ||
bf4ef679 CM |
3004 | ret = find_root_for_ref(extent_root, path, &found_key, |
3005 | level, 0, &found_root, | |
3006 | extent_key->objectid); | |
3007 | ||
3008 | if (ret) | |
3009 | goto out; | |
3010 | ||
7d9eb12c CM |
3011 | /* |
3012 | * right here almost anything could happen to our key, | |
3013 | * but that's ok. The cow below will either relocate it | |
3014 | * or someone else will have relocated it. Either way, | |
3015 | * it is in a different spot than it was before and | |
3016 | * we're happy. | |
3017 | */ | |
3018 | ||
bf4ef679 CM |
3019 | trans = btrfs_start_transaction(found_root, 1); |
3020 | ||
7d9eb12c CM |
3021 | if (found_root == extent_root->fs_info->extent_root || |
3022 | found_root == extent_root->fs_info->chunk_root || | |
3023 | found_root == extent_root->fs_info->dev_root) { | |
3024 | needs_lock = 1; | |
3025 | mutex_lock(&extent_root->fs_info->alloc_mutex); | |
3026 | } | |
3027 | ||
edbd8d4e | 3028 | path->lowest_level = level; |
8f662a76 | 3029 | path->reada = 2; |
edbd8d4e CM |
3030 | ret = btrfs_search_slot(trans, found_root, &found_key, path, |
3031 | 0, 1); | |
3032 | path->lowest_level = 0; | |
edbd8d4e | 3033 | btrfs_release_path(found_root, path); |
7d9eb12c | 3034 | |
0ef3e66b CM |
3035 | if (found_root == found_root->fs_info->extent_root) |
3036 | btrfs_extent_post_op(trans, found_root); | |
7d9eb12c CM |
3037 | if (needs_lock) |
3038 | mutex_unlock(&extent_root->fs_info->alloc_mutex); | |
3039 | ||
edbd8d4e | 3040 | btrfs_end_transaction(trans, found_root); |
edbd8d4e | 3041 | |
7d9eb12c | 3042 | } |
edbd8d4e | 3043 | out: |
7d9eb12c | 3044 | mutex_lock(&extent_root->fs_info->alloc_mutex); |
edbd8d4e CM |
3045 | return 0; |
3046 | } | |
3047 | ||
a061fc8d CM |
3048 | static int noinline del_extent_zero(struct btrfs_root *extent_root, |
3049 | struct btrfs_path *path, | |
3050 | struct btrfs_key *extent_key) | |
3051 | { | |
3052 | int ret; | |
3053 | struct btrfs_trans_handle *trans; | |
3054 | ||
3055 | trans = btrfs_start_transaction(extent_root, 1); | |
3056 | ret = btrfs_search_slot(trans, extent_root, extent_key, path, -1, 1); | |
3057 | if (ret > 0) { | |
3058 | ret = -EIO; | |
3059 | goto out; | |
3060 | } | |
3061 | if (ret < 0) | |
3062 | goto out; | |
3063 | ret = btrfs_del_item(trans, extent_root, path); | |
3064 | out: | |
3065 | btrfs_end_transaction(trans, extent_root); | |
3066 | return ret; | |
3067 | } | |
3068 | ||
98ed5174 CM |
3069 | static int noinline relocate_one_extent(struct btrfs_root *extent_root, |
3070 | struct btrfs_path *path, | |
3071 | struct btrfs_key *extent_key) | |
edbd8d4e CM |
3072 | { |
3073 | struct btrfs_key key; | |
3074 | struct btrfs_key found_key; | |
edbd8d4e | 3075 | struct extent_buffer *leaf; |
0ef3e66b CM |
3076 | u64 last_file_objectid = 0; |
3077 | u64 last_file_root = 0; | |
3078 | u64 last_file_offset = (u64)-1; | |
3079 | u64 last_extent = 0; | |
edbd8d4e CM |
3080 | u32 nritems; |
3081 | u32 item_size; | |
3082 | int ret = 0; | |
3083 | ||
a061fc8d CM |
3084 | if (extent_key->objectid == 0) { |
3085 | ret = del_extent_zero(extent_root, path, extent_key); | |
3086 | goto out; | |
3087 | } | |
edbd8d4e CM |
3088 | key.objectid = extent_key->objectid; |
3089 | key.type = BTRFS_EXTENT_REF_KEY; | |
3090 | key.offset = 0; | |
3091 | ||
3092 | while(1) { | |
3093 | ret = btrfs_search_slot(NULL, extent_root, &key, path, 0, 0); | |
3094 | ||
edbd8d4e CM |
3095 | if (ret < 0) |
3096 | goto out; | |
3097 | ||
3098 | ret = 0; | |
3099 | leaf = path->nodes[0]; | |
3100 | nritems = btrfs_header_nritems(leaf); | |
a061fc8d CM |
3101 | if (path->slots[0] == nritems) { |
3102 | ret = btrfs_next_leaf(extent_root, path); | |
3103 | if (ret > 0) { | |
3104 | ret = 0; | |
3105 | goto out; | |
3106 | } | |
3107 | if (ret < 0) | |
3108 | goto out; | |
bf4ef679 | 3109 | leaf = path->nodes[0]; |
a061fc8d | 3110 | } |
edbd8d4e CM |
3111 | |
3112 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); | |
a061fc8d | 3113 | if (found_key.objectid != extent_key->objectid) { |
edbd8d4e | 3114 | break; |
a061fc8d | 3115 | } |
edbd8d4e | 3116 | |
a061fc8d | 3117 | if (found_key.type != BTRFS_EXTENT_REF_KEY) { |
edbd8d4e | 3118 | break; |
a061fc8d | 3119 | } |
edbd8d4e CM |
3120 | |
3121 | key.offset = found_key.offset + 1; | |
3122 | item_size = btrfs_item_size_nr(leaf, path->slots[0]); | |
3123 | ||
0ef3e66b CM |
3124 | ret = relocate_one_reference(extent_root, path, extent_key, |
3125 | &last_file_objectid, | |
3126 | &last_file_offset, | |
3127 | &last_file_root, last_extent); | |
edbd8d4e CM |
3128 | if (ret) |
3129 | goto out; | |
0ef3e66b | 3130 | last_extent = extent_key->objectid; |
edbd8d4e CM |
3131 | } |
3132 | ret = 0; | |
3133 | out: | |
3134 | btrfs_release_path(extent_root, path); | |
3135 | return ret; | |
3136 | } | |
3137 | ||
ec44a35c CM |
3138 | static u64 update_block_group_flags(struct btrfs_root *root, u64 flags) |
3139 | { | |
3140 | u64 num_devices; | |
3141 | u64 stripped = BTRFS_BLOCK_GROUP_RAID0 | | |
3142 | BTRFS_BLOCK_GROUP_RAID1 | BTRFS_BLOCK_GROUP_RAID10; | |
3143 | ||
a061fc8d | 3144 | num_devices = root->fs_info->fs_devices->num_devices; |
ec44a35c CM |
3145 | if (num_devices == 1) { |
3146 | stripped |= BTRFS_BLOCK_GROUP_DUP; | |
3147 | stripped = flags & ~stripped; | |
3148 | ||
3149 | /* turn raid0 into single device chunks */ | |
3150 | if (flags & BTRFS_BLOCK_GROUP_RAID0) | |
3151 | return stripped; | |
3152 | ||
3153 | /* turn mirroring into duplication */ | |
3154 | if (flags & (BTRFS_BLOCK_GROUP_RAID1 | | |
3155 | BTRFS_BLOCK_GROUP_RAID10)) | |
3156 | return stripped | BTRFS_BLOCK_GROUP_DUP; | |
3157 | return flags; | |
3158 | } else { | |
3159 | /* they already had raid on here, just return */ | |
ec44a35c CM |
3160 | if (flags & stripped) |
3161 | return flags; | |
3162 | ||
3163 | stripped |= BTRFS_BLOCK_GROUP_DUP; | |
3164 | stripped = flags & ~stripped; | |
3165 | ||
3166 | /* switch duplicated blocks with raid1 */ | |
3167 | if (flags & BTRFS_BLOCK_GROUP_DUP) | |
3168 | return stripped | BTRFS_BLOCK_GROUP_RAID1; | |
3169 | ||
3170 | /* turn single device chunks into raid0 */ | |
3171 | return stripped | BTRFS_BLOCK_GROUP_RAID0; | |
3172 | } | |
3173 | return flags; | |
3174 | } | |
3175 | ||
0ef3e66b CM |
3176 | int __alloc_chunk_for_shrink(struct btrfs_root *root, |
3177 | struct btrfs_block_group_cache *shrink_block_group, | |
3178 | int force) | |
3179 | { | |
3180 | struct btrfs_trans_handle *trans; | |
3181 | u64 new_alloc_flags; | |
3182 | u64 calc; | |
3183 | ||
c286ac48 | 3184 | spin_lock(&shrink_block_group->lock); |
0ef3e66b | 3185 | if (btrfs_block_group_used(&shrink_block_group->item) > 0) { |
c286ac48 | 3186 | spin_unlock(&shrink_block_group->lock); |
7d9eb12c | 3187 | mutex_unlock(&root->fs_info->alloc_mutex); |
c286ac48 | 3188 | |
0ef3e66b | 3189 | trans = btrfs_start_transaction(root, 1); |
7d9eb12c | 3190 | mutex_lock(&root->fs_info->alloc_mutex); |
c286ac48 | 3191 | spin_lock(&shrink_block_group->lock); |
7d9eb12c | 3192 | |
0ef3e66b CM |
3193 | new_alloc_flags = update_block_group_flags(root, |
3194 | shrink_block_group->flags); | |
3195 | if (new_alloc_flags != shrink_block_group->flags) { | |
3196 | calc = | |
3197 | btrfs_block_group_used(&shrink_block_group->item); | |
3198 | } else { | |
3199 | calc = shrink_block_group->key.offset; | |
3200 | } | |
c286ac48 CM |
3201 | spin_unlock(&shrink_block_group->lock); |
3202 | ||
0ef3e66b CM |
3203 | do_chunk_alloc(trans, root->fs_info->extent_root, |
3204 | calc + 2 * 1024 * 1024, new_alloc_flags, force); | |
7d9eb12c CM |
3205 | |
3206 | mutex_unlock(&root->fs_info->alloc_mutex); | |
0ef3e66b | 3207 | btrfs_end_transaction(trans, root); |
7d9eb12c | 3208 | mutex_lock(&root->fs_info->alloc_mutex); |
c286ac48 CM |
3209 | } else |
3210 | spin_unlock(&shrink_block_group->lock); | |
0ef3e66b CM |
3211 | return 0; |
3212 | } | |
3213 | ||
8f18cf13 | 3214 | int btrfs_shrink_extent_tree(struct btrfs_root *root, u64 shrink_start) |
edbd8d4e CM |
3215 | { |
3216 | struct btrfs_trans_handle *trans; | |
3217 | struct btrfs_root *tree_root = root->fs_info->tree_root; | |
3218 | struct btrfs_path *path; | |
3219 | u64 cur_byte; | |
3220 | u64 total_found; | |
8f18cf13 CM |
3221 | u64 shrink_last_byte; |
3222 | struct btrfs_block_group_cache *shrink_block_group; | |
edbd8d4e | 3223 | struct btrfs_fs_info *info = root->fs_info; |
edbd8d4e | 3224 | struct btrfs_key key; |
73e48b27 | 3225 | struct btrfs_key found_key; |
edbd8d4e CM |
3226 | struct extent_buffer *leaf; |
3227 | u32 nritems; | |
3228 | int ret; | |
a061fc8d | 3229 | int progress; |
edbd8d4e | 3230 | |
925baedd | 3231 | mutex_lock(&root->fs_info->alloc_mutex); |
8f18cf13 CM |
3232 | shrink_block_group = btrfs_lookup_block_group(root->fs_info, |
3233 | shrink_start); | |
3234 | BUG_ON(!shrink_block_group); | |
3235 | ||
0ef3e66b CM |
3236 | shrink_last_byte = shrink_block_group->key.objectid + |
3237 | shrink_block_group->key.offset; | |
8f18cf13 CM |
3238 | |
3239 | shrink_block_group->space_info->total_bytes -= | |
3240 | shrink_block_group->key.offset; | |
edbd8d4e CM |
3241 | path = btrfs_alloc_path(); |
3242 | root = root->fs_info->extent_root; | |
8f662a76 | 3243 | path->reada = 2; |
edbd8d4e | 3244 | |
323da79c CM |
3245 | printk("btrfs relocating block group %llu flags %llu\n", |
3246 | (unsigned long long)shrink_start, | |
3247 | (unsigned long long)shrink_block_group->flags); | |
3248 | ||
0ef3e66b CM |
3249 | __alloc_chunk_for_shrink(root, shrink_block_group, 1); |
3250 | ||
edbd8d4e | 3251 | again: |
323da79c | 3252 | |
8f18cf13 CM |
3253 | shrink_block_group->ro = 1; |
3254 | ||
edbd8d4e | 3255 | total_found = 0; |
a061fc8d | 3256 | progress = 0; |
8f18cf13 | 3257 | key.objectid = shrink_start; |
edbd8d4e CM |
3258 | key.offset = 0; |
3259 | key.type = 0; | |
73e48b27 | 3260 | cur_byte = key.objectid; |
4313b399 | 3261 | |
73e48b27 Y |
3262 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); |
3263 | if (ret < 0) | |
3264 | goto out; | |
3265 | ||
0b86a832 | 3266 | ret = btrfs_previous_item(root, path, 0, BTRFS_EXTENT_ITEM_KEY); |
73e48b27 Y |
3267 | if (ret < 0) |
3268 | goto out; | |
8f18cf13 | 3269 | |
73e48b27 Y |
3270 | if (ret == 0) { |
3271 | leaf = path->nodes[0]; | |
3272 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); | |
8f18cf13 CM |
3273 | if (found_key.objectid + found_key.offset > shrink_start && |
3274 | found_key.objectid < shrink_last_byte) { | |
73e48b27 Y |
3275 | cur_byte = found_key.objectid; |
3276 | key.objectid = cur_byte; | |
3277 | } | |
3278 | } | |
3279 | btrfs_release_path(root, path); | |
3280 | ||
3281 | while(1) { | |
edbd8d4e CM |
3282 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); |
3283 | if (ret < 0) | |
3284 | goto out; | |
73e48b27 | 3285 | |
7d9eb12c | 3286 | next: |
edbd8d4e | 3287 | leaf = path->nodes[0]; |
73e48b27 | 3288 | nritems = btrfs_header_nritems(leaf); |
73e48b27 Y |
3289 | if (path->slots[0] >= nritems) { |
3290 | ret = btrfs_next_leaf(root, path); | |
3291 | if (ret < 0) | |
3292 | goto out; | |
3293 | if (ret == 1) { | |
3294 | ret = 0; | |
3295 | break; | |
edbd8d4e | 3296 | } |
73e48b27 Y |
3297 | leaf = path->nodes[0]; |
3298 | nritems = btrfs_header_nritems(leaf); | |
edbd8d4e | 3299 | } |
73e48b27 Y |
3300 | |
3301 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); | |
725c8463 | 3302 | |
8f18cf13 CM |
3303 | if (found_key.objectid >= shrink_last_byte) |
3304 | break; | |
3305 | ||
725c8463 CM |
3306 | if (progress && need_resched()) { |
3307 | memcpy(&key, &found_key, sizeof(key)); | |
725c8463 | 3308 | cond_resched(); |
725c8463 CM |
3309 | btrfs_release_path(root, path); |
3310 | btrfs_search_slot(NULL, root, &key, path, 0, 0); | |
3311 | progress = 0; | |
3312 | goto next; | |
3313 | } | |
3314 | progress = 1; | |
3315 | ||
73e48b27 Y |
3316 | if (btrfs_key_type(&found_key) != BTRFS_EXTENT_ITEM_KEY || |
3317 | found_key.objectid + found_key.offset <= cur_byte) { | |
0ef3e66b CM |
3318 | memcpy(&key, &found_key, sizeof(key)); |
3319 | key.offset++; | |
edbd8d4e | 3320 | path->slots[0]++; |
edbd8d4e CM |
3321 | goto next; |
3322 | } | |
73e48b27 | 3323 | |
edbd8d4e CM |
3324 | total_found++; |
3325 | cur_byte = found_key.objectid + found_key.offset; | |
3326 | key.objectid = cur_byte; | |
3327 | btrfs_release_path(root, path); | |
3328 | ret = relocate_one_extent(root, path, &found_key); | |
0ef3e66b | 3329 | __alloc_chunk_for_shrink(root, shrink_block_group, 0); |
edbd8d4e CM |
3330 | } |
3331 | ||
3332 | btrfs_release_path(root, path); | |
3333 | ||
3334 | if (total_found > 0) { | |
323da79c CM |
3335 | printk("btrfs relocate found %llu last extent was %llu\n", |
3336 | (unsigned long long)total_found, | |
3337 | (unsigned long long)found_key.objectid); | |
7d9eb12c | 3338 | mutex_unlock(&root->fs_info->alloc_mutex); |
edbd8d4e CM |
3339 | trans = btrfs_start_transaction(tree_root, 1); |
3340 | btrfs_commit_transaction(trans, tree_root); | |
3341 | ||
edbd8d4e | 3342 | btrfs_clean_old_snapshots(tree_root); |
edbd8d4e | 3343 | |
3eaa2885 CM |
3344 | btrfs_wait_ordered_extents(tree_root); |
3345 | ||
edbd8d4e CM |
3346 | trans = btrfs_start_transaction(tree_root, 1); |
3347 | btrfs_commit_transaction(trans, tree_root); | |
7d9eb12c | 3348 | mutex_lock(&root->fs_info->alloc_mutex); |
edbd8d4e CM |
3349 | goto again; |
3350 | } | |
3351 | ||
8f18cf13 CM |
3352 | /* |
3353 | * we've freed all the extents, now remove the block | |
3354 | * group item from the tree | |
3355 | */ | |
7d9eb12c CM |
3356 | mutex_unlock(&root->fs_info->alloc_mutex); |
3357 | ||
edbd8d4e | 3358 | trans = btrfs_start_transaction(root, 1); |
c286ac48 | 3359 | |
7d9eb12c | 3360 | mutex_lock(&root->fs_info->alloc_mutex); |
8f18cf13 | 3361 | memcpy(&key, &shrink_block_group->key, sizeof(key)); |
1372f8e6 | 3362 | |
8f18cf13 CM |
3363 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); |
3364 | if (ret > 0) | |
3365 | ret = -EIO; | |
8e8a1e31 JB |
3366 | if (ret < 0) { |
3367 | btrfs_end_transaction(trans, root); | |
8f18cf13 | 3368 | goto out; |
8e8a1e31 | 3369 | } |
73e48b27 | 3370 | |
0ef3e66b CM |
3371 | clear_extent_bits(&info->block_group_cache, key.objectid, |
3372 | key.objectid + key.offset - 1, | |
8f18cf13 | 3373 | (unsigned int)-1, GFP_NOFS); |
edbd8d4e | 3374 | |
0ef3e66b CM |
3375 | |
3376 | clear_extent_bits(&info->free_space_cache, | |
3377 | key.objectid, key.objectid + key.offset - 1, | |
3378 | (unsigned int)-1, GFP_NOFS); | |
3379 | ||
3380 | memset(shrink_block_group, 0, sizeof(*shrink_block_group)); | |
3381 | kfree(shrink_block_group); | |
3382 | ||
8f18cf13 | 3383 | btrfs_del_item(trans, root, path); |
7d9eb12c CM |
3384 | btrfs_release_path(root, path); |
3385 | mutex_unlock(&root->fs_info->alloc_mutex); | |
edbd8d4e | 3386 | btrfs_commit_transaction(trans, root); |
0ef3e66b | 3387 | |
7d9eb12c CM |
3388 | mutex_lock(&root->fs_info->alloc_mutex); |
3389 | ||
0ef3e66b CM |
3390 | /* the code to unpin extents might set a few bits in the free |
3391 | * space cache for this range again | |
3392 | */ | |
3393 | clear_extent_bits(&info->free_space_cache, | |
3394 | key.objectid, key.objectid + key.offset - 1, | |
3395 | (unsigned int)-1, GFP_NOFS); | |
edbd8d4e CM |
3396 | out: |
3397 | btrfs_free_path(path); | |
925baedd | 3398 | mutex_unlock(&root->fs_info->alloc_mutex); |
edbd8d4e CM |
3399 | return ret; |
3400 | } | |
3401 | ||
0b86a832 CM |
3402 | int find_first_block_group(struct btrfs_root *root, struct btrfs_path *path, |
3403 | struct btrfs_key *key) | |
3404 | { | |
925baedd | 3405 | int ret = 0; |
0b86a832 CM |
3406 | struct btrfs_key found_key; |
3407 | struct extent_buffer *leaf; | |
3408 | int slot; | |
edbd8d4e | 3409 | |
0b86a832 CM |
3410 | ret = btrfs_search_slot(NULL, root, key, path, 0, 0); |
3411 | if (ret < 0) | |
925baedd CM |
3412 | goto out; |
3413 | ||
0b86a832 CM |
3414 | while(1) { |
3415 | slot = path->slots[0]; | |
edbd8d4e | 3416 | leaf = path->nodes[0]; |
0b86a832 CM |
3417 | if (slot >= btrfs_header_nritems(leaf)) { |
3418 | ret = btrfs_next_leaf(root, path); | |
3419 | if (ret == 0) | |
3420 | continue; | |
3421 | if (ret < 0) | |
925baedd | 3422 | goto out; |
0b86a832 | 3423 | break; |
edbd8d4e | 3424 | } |
0b86a832 | 3425 | btrfs_item_key_to_cpu(leaf, &found_key, slot); |
edbd8d4e | 3426 | |
0b86a832 | 3427 | if (found_key.objectid >= key->objectid && |
925baedd CM |
3428 | found_key.type == BTRFS_BLOCK_GROUP_ITEM_KEY) { |
3429 | ret = 0; | |
3430 | goto out; | |
3431 | } | |
0b86a832 | 3432 | path->slots[0]++; |
edbd8d4e | 3433 | } |
0b86a832 | 3434 | ret = -ENOENT; |
925baedd | 3435 | out: |
0b86a832 | 3436 | return ret; |
edbd8d4e CM |
3437 | } |
3438 | ||
9078a3e1 CM |
3439 | int btrfs_read_block_groups(struct btrfs_root *root) |
3440 | { | |
3441 | struct btrfs_path *path; | |
3442 | int ret; | |
96b5179d | 3443 | int bit; |
9078a3e1 | 3444 | struct btrfs_block_group_cache *cache; |
be744175 | 3445 | struct btrfs_fs_info *info = root->fs_info; |
6324fbf3 | 3446 | struct btrfs_space_info *space_info; |
d1310b2e | 3447 | struct extent_io_tree *block_group_cache; |
9078a3e1 CM |
3448 | struct btrfs_key key; |
3449 | struct btrfs_key found_key; | |
5f39d397 | 3450 | struct extent_buffer *leaf; |
96b5179d CM |
3451 | |
3452 | block_group_cache = &info->block_group_cache; | |
be744175 | 3453 | root = info->extent_root; |
9078a3e1 | 3454 | key.objectid = 0; |
0b86a832 | 3455 | key.offset = 0; |
9078a3e1 | 3456 | btrfs_set_key_type(&key, BTRFS_BLOCK_GROUP_ITEM_KEY); |
9078a3e1 CM |
3457 | path = btrfs_alloc_path(); |
3458 | if (!path) | |
3459 | return -ENOMEM; | |
3460 | ||
925baedd | 3461 | mutex_lock(&root->fs_info->alloc_mutex); |
9078a3e1 | 3462 | while(1) { |
0b86a832 CM |
3463 | ret = find_first_block_group(root, path, &key); |
3464 | if (ret > 0) { | |
3465 | ret = 0; | |
3466 | goto error; | |
9078a3e1 | 3467 | } |
0b86a832 CM |
3468 | if (ret != 0) |
3469 | goto error; | |
3470 | ||
5f39d397 CM |
3471 | leaf = path->nodes[0]; |
3472 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); | |
8f18cf13 | 3473 | cache = kzalloc(sizeof(*cache), GFP_NOFS); |
9078a3e1 | 3474 | if (!cache) { |
0b86a832 | 3475 | ret = -ENOMEM; |
9078a3e1 CM |
3476 | break; |
3477 | } | |
3e1ad54f | 3478 | |
c286ac48 | 3479 | spin_lock_init(&cache->lock); |
5f39d397 CM |
3480 | read_extent_buffer(leaf, &cache->item, |
3481 | btrfs_item_ptr_offset(leaf, path->slots[0]), | |
3482 | sizeof(cache->item)); | |
9078a3e1 | 3483 | memcpy(&cache->key, &found_key, sizeof(found_key)); |
0b86a832 | 3484 | |
9078a3e1 CM |
3485 | key.objectid = found_key.objectid + found_key.offset; |
3486 | btrfs_release_path(root, path); | |
0b86a832 CM |
3487 | cache->flags = btrfs_block_group_flags(&cache->item); |
3488 | bit = 0; | |
3489 | if (cache->flags & BTRFS_BLOCK_GROUP_DATA) { | |
96b5179d | 3490 | bit = BLOCK_GROUP_DATA; |
0b86a832 CM |
3491 | } else if (cache->flags & BTRFS_BLOCK_GROUP_SYSTEM) { |
3492 | bit = BLOCK_GROUP_SYSTEM; | |
3493 | } else if (cache->flags & BTRFS_BLOCK_GROUP_METADATA) { | |
96b5179d | 3494 | bit = BLOCK_GROUP_METADATA; |
31f3c99b | 3495 | } |
8790d502 | 3496 | set_avail_alloc_bits(info, cache->flags); |
96b5179d | 3497 | |
6324fbf3 CM |
3498 | ret = update_space_info(info, cache->flags, found_key.offset, |
3499 | btrfs_block_group_used(&cache->item), | |
3500 | &space_info); | |
3501 | BUG_ON(ret); | |
3502 | cache->space_info = space_info; | |
3503 | ||
96b5179d CM |
3504 | /* use EXTENT_LOCKED to prevent merging */ |
3505 | set_extent_bits(block_group_cache, found_key.objectid, | |
3506 | found_key.objectid + found_key.offset - 1, | |
c286ac48 | 3507 | EXTENT_LOCKED, GFP_NOFS); |
96b5179d | 3508 | set_state_private(block_group_cache, found_key.objectid, |
ae2f5411 | 3509 | (unsigned long)cache); |
c286ac48 CM |
3510 | set_extent_bits(block_group_cache, found_key.objectid, |
3511 | found_key.objectid + found_key.offset - 1, | |
3512 | bit | EXTENT_LOCKED, GFP_NOFS); | |
9078a3e1 | 3513 | if (key.objectid >= |
db94535d | 3514 | btrfs_super_total_bytes(&info->super_copy)) |
9078a3e1 CM |
3515 | break; |
3516 | } | |
0b86a832 CM |
3517 | ret = 0; |
3518 | error: | |
9078a3e1 | 3519 | btrfs_free_path(path); |
925baedd | 3520 | mutex_unlock(&root->fs_info->alloc_mutex); |
0b86a832 | 3521 | return ret; |
9078a3e1 | 3522 | } |
6324fbf3 CM |
3523 | |
3524 | int btrfs_make_block_group(struct btrfs_trans_handle *trans, | |
3525 | struct btrfs_root *root, u64 bytes_used, | |
e17cade2 | 3526 | u64 type, u64 chunk_objectid, u64 chunk_offset, |
6324fbf3 CM |
3527 | u64 size) |
3528 | { | |
3529 | int ret; | |
3530 | int bit = 0; | |
3531 | struct btrfs_root *extent_root; | |
3532 | struct btrfs_block_group_cache *cache; | |
3533 | struct extent_io_tree *block_group_cache; | |
3534 | ||
7d9eb12c | 3535 | WARN_ON(!mutex_is_locked(&root->fs_info->alloc_mutex)); |
6324fbf3 CM |
3536 | extent_root = root->fs_info->extent_root; |
3537 | block_group_cache = &root->fs_info->block_group_cache; | |
3538 | ||
8f18cf13 | 3539 | cache = kzalloc(sizeof(*cache), GFP_NOFS); |
6324fbf3 | 3540 | BUG_ON(!cache); |
e17cade2 | 3541 | cache->key.objectid = chunk_offset; |
6324fbf3 | 3542 | cache->key.offset = size; |
c286ac48 | 3543 | spin_lock_init(&cache->lock); |
6324fbf3 | 3544 | btrfs_set_key_type(&cache->key, BTRFS_BLOCK_GROUP_ITEM_KEY); |
0ef3e66b | 3545 | |
6324fbf3 | 3546 | btrfs_set_block_group_used(&cache->item, bytes_used); |
6324fbf3 CM |
3547 | btrfs_set_block_group_chunk_objectid(&cache->item, chunk_objectid); |
3548 | cache->flags = type; | |
3549 | btrfs_set_block_group_flags(&cache->item, type); | |
3550 | ||
3551 | ret = update_space_info(root->fs_info, cache->flags, size, bytes_used, | |
3552 | &cache->space_info); | |
3553 | BUG_ON(ret); | |
3554 | ||
d18a2c44 | 3555 | bit = block_group_state_bits(type); |
e17cade2 CM |
3556 | set_extent_bits(block_group_cache, chunk_offset, |
3557 | chunk_offset + size - 1, | |
c286ac48 | 3558 | EXTENT_LOCKED, GFP_NOFS); |
e17cade2 CM |
3559 | set_state_private(block_group_cache, chunk_offset, |
3560 | (unsigned long)cache); | |
c286ac48 CM |
3561 | set_extent_bits(block_group_cache, chunk_offset, |
3562 | chunk_offset + size - 1, | |
3563 | bit | EXTENT_LOCKED, GFP_NOFS); | |
3564 | ||
6324fbf3 CM |
3565 | ret = btrfs_insert_item(trans, extent_root, &cache->key, &cache->item, |
3566 | sizeof(cache->item)); | |
3567 | BUG_ON(ret); | |
3568 | ||
3569 | finish_current_insert(trans, extent_root); | |
3570 | ret = del_pending_extents(trans, extent_root); | |
3571 | BUG_ON(ret); | |
d18a2c44 | 3572 | set_avail_alloc_bits(extent_root->fs_info, type); |
925baedd | 3573 | |
6324fbf3 CM |
3574 | return 0; |
3575 | } |