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" |
fec577fb | 29 | |
0b86a832 | 30 | #define BLOCK_GROUP_DATA EXTENT_WRITEBACK |
96b5179d | 31 | #define BLOCK_GROUP_METADATA EXTENT_UPTODATE |
0b86a832 CM |
32 | #define BLOCK_GROUP_SYSTEM EXTENT_NEW |
33 | ||
96b5179d CM |
34 | #define BLOCK_GROUP_DIRTY EXTENT_DIRTY |
35 | ||
e089f05c CM |
36 | static int finish_current_insert(struct btrfs_trans_handle *trans, struct |
37 | btrfs_root *extent_root); | |
e20d96d6 CM |
38 | static int del_pending_extents(struct btrfs_trans_handle *trans, struct |
39 | btrfs_root *extent_root); | |
925baedd CM |
40 | static struct btrfs_block_group_cache * |
41 | __btrfs_find_block_group(struct btrfs_root *root, | |
42 | struct btrfs_block_group_cache *hint, | |
43 | u64 search_start, int data, int owner); | |
d548ee51 | 44 | |
925baedd CM |
45 | void maybe_lock_mutex(struct btrfs_root *root) |
46 | { | |
47 | if (root != root->fs_info->extent_root && | |
48 | root != root->fs_info->chunk_root && | |
49 | root != root->fs_info->dev_root) { | |
50 | mutex_lock(&root->fs_info->alloc_mutex); | |
51 | } | |
52 | } | |
53 | ||
54 | void maybe_unlock_mutex(struct btrfs_root *root) | |
55 | { | |
56 | if (root != root->fs_info->extent_root && | |
57 | root != root->fs_info->chunk_root && | |
58 | root != root->fs_info->dev_root) { | |
59 | mutex_unlock(&root->fs_info->alloc_mutex); | |
60 | } | |
61 | } | |
fec577fb | 62 | |
e37c9e69 CM |
63 | static int cache_block_group(struct btrfs_root *root, |
64 | struct btrfs_block_group_cache *block_group) | |
65 | { | |
66 | struct btrfs_path *path; | |
67 | int ret; | |
68 | struct btrfs_key key; | |
5f39d397 | 69 | struct extent_buffer *leaf; |
d1310b2e | 70 | struct extent_io_tree *free_space_cache; |
e37c9e69 | 71 | int slot; |
e37c9e69 CM |
72 | u64 last = 0; |
73 | u64 hole_size; | |
7d7d6068 | 74 | u64 first_free; |
e37c9e69 CM |
75 | int found = 0; |
76 | ||
00f5c795 CM |
77 | if (!block_group) |
78 | return 0; | |
79 | ||
e37c9e69 | 80 | root = root->fs_info->extent_root; |
f510cfec | 81 | free_space_cache = &root->fs_info->free_space_cache; |
e37c9e69 CM |
82 | |
83 | if (block_group->cached) | |
84 | return 0; | |
f510cfec | 85 | |
e37c9e69 CM |
86 | path = btrfs_alloc_path(); |
87 | if (!path) | |
88 | return -ENOMEM; | |
7d7d6068 | 89 | |
2cc58cf2 | 90 | path->reada = 2; |
7d7d6068 | 91 | first_free = block_group->key.objectid; |
e37c9e69 | 92 | key.objectid = block_group->key.objectid; |
e37c9e69 CM |
93 | key.offset = 0; |
94 | btrfs_set_key_type(&key, BTRFS_EXTENT_ITEM_KEY); | |
95 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); | |
96 | if (ret < 0) | |
97 | return ret; | |
0b86a832 | 98 | ret = btrfs_previous_item(root, path, 0, BTRFS_EXTENT_ITEM_KEY); |
d548ee51 Y |
99 | if (ret < 0) |
100 | return ret; | |
101 | if (ret == 0) { | |
102 | leaf = path->nodes[0]; | |
103 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); | |
104 | if (key.objectid + key.offset > first_free) | |
105 | first_free = key.objectid + key.offset; | |
106 | } | |
e37c9e69 | 107 | while(1) { |
5f39d397 | 108 | leaf = path->nodes[0]; |
e37c9e69 | 109 | slot = path->slots[0]; |
5f39d397 | 110 | if (slot >= btrfs_header_nritems(leaf)) { |
e37c9e69 | 111 | ret = btrfs_next_leaf(root, path); |
54aa1f4d CM |
112 | if (ret < 0) |
113 | goto err; | |
de428b63 | 114 | if (ret == 0) { |
e37c9e69 | 115 | continue; |
de428b63 | 116 | } else { |
e37c9e69 CM |
117 | break; |
118 | } | |
119 | } | |
5f39d397 | 120 | btrfs_item_key_to_cpu(leaf, &key, slot); |
7d7d6068 | 121 | if (key.objectid < block_group->key.objectid) { |
7d7d6068 Y |
122 | goto next; |
123 | } | |
e37c9e69 CM |
124 | if (key.objectid >= block_group->key.objectid + |
125 | block_group->key.offset) { | |
e37c9e69 CM |
126 | break; |
127 | } | |
7d7d6068 | 128 | |
e37c9e69 CM |
129 | if (btrfs_key_type(&key) == BTRFS_EXTENT_ITEM_KEY) { |
130 | if (!found) { | |
7d7d6068 | 131 | last = first_free; |
e37c9e69 | 132 | found = 1; |
e37c9e69 | 133 | } |
f510cfec CM |
134 | if (key.objectid > last) { |
135 | hole_size = key.objectid - last; | |
136 | set_extent_dirty(free_space_cache, last, | |
137 | last + hole_size - 1, | |
138 | GFP_NOFS); | |
7d7d6068 Y |
139 | } |
140 | last = key.objectid + key.offset; | |
e37c9e69 | 141 | } |
7d7d6068 | 142 | next: |
e37c9e69 CM |
143 | path->slots[0]++; |
144 | } | |
145 | ||
7d7d6068 Y |
146 | if (!found) |
147 | last = first_free; | |
148 | if (block_group->key.objectid + | |
149 | block_group->key.offset > last) { | |
150 | hole_size = block_group->key.objectid + | |
151 | block_group->key.offset - last; | |
f510cfec CM |
152 | set_extent_dirty(free_space_cache, last, |
153 | last + hole_size - 1, GFP_NOFS); | |
7d7d6068 | 154 | } |
e37c9e69 | 155 | block_group->cached = 1; |
54aa1f4d | 156 | err: |
e37c9e69 CM |
157 | btrfs_free_path(path); |
158 | return 0; | |
159 | } | |
160 | ||
0ef3e66b CM |
161 | struct btrfs_block_group_cache *btrfs_lookup_first_block_group(struct |
162 | btrfs_fs_info *info, | |
163 | u64 bytenr) | |
164 | { | |
165 | struct extent_io_tree *block_group_cache; | |
166 | struct btrfs_block_group_cache *block_group = NULL; | |
167 | u64 ptr; | |
168 | u64 start; | |
169 | u64 end; | |
170 | int ret; | |
171 | ||
172 | bytenr = max_t(u64, bytenr, | |
173 | BTRFS_SUPER_INFO_OFFSET + BTRFS_SUPER_INFO_SIZE); | |
174 | block_group_cache = &info->block_group_cache; | |
175 | ret = find_first_extent_bit(block_group_cache, | |
176 | bytenr, &start, &end, | |
177 | BLOCK_GROUP_DATA | BLOCK_GROUP_METADATA | | |
178 | BLOCK_GROUP_SYSTEM); | |
179 | if (ret) { | |
180 | return NULL; | |
181 | } | |
182 | ret = get_state_private(block_group_cache, start, &ptr); | |
183 | if (ret) | |
184 | return NULL; | |
185 | ||
186 | block_group = (struct btrfs_block_group_cache *)(unsigned long)ptr; | |
187 | return block_group; | |
188 | } | |
189 | ||
5276aeda CM |
190 | struct btrfs_block_group_cache *btrfs_lookup_block_group(struct |
191 | btrfs_fs_info *info, | |
db94535d | 192 | u64 bytenr) |
be744175 | 193 | { |
d1310b2e | 194 | struct extent_io_tree *block_group_cache; |
96b5179d CM |
195 | struct btrfs_block_group_cache *block_group = NULL; |
196 | u64 ptr; | |
197 | u64 start; | |
198 | u64 end; | |
be744175 CM |
199 | int ret; |
200 | ||
a061fc8d CM |
201 | bytenr = max_t(u64, bytenr, |
202 | BTRFS_SUPER_INFO_OFFSET + BTRFS_SUPER_INFO_SIZE); | |
96b5179d CM |
203 | block_group_cache = &info->block_group_cache; |
204 | ret = find_first_extent_bit(block_group_cache, | |
db94535d | 205 | bytenr, &start, &end, |
0b86a832 CM |
206 | BLOCK_GROUP_DATA | BLOCK_GROUP_METADATA | |
207 | BLOCK_GROUP_SYSTEM); | |
be744175 | 208 | if (ret) { |
96b5179d | 209 | return NULL; |
be744175 | 210 | } |
96b5179d CM |
211 | ret = get_state_private(block_group_cache, start, &ptr); |
212 | if (ret) | |
213 | return NULL; | |
214 | ||
ae2f5411 | 215 | block_group = (struct btrfs_block_group_cache *)(unsigned long)ptr; |
5cf66426 | 216 | if (block_group->key.objectid <= bytenr && bytenr < |
96b5179d CM |
217 | block_group->key.objectid + block_group->key.offset) |
218 | return block_group; | |
be744175 CM |
219 | return NULL; |
220 | } | |
0b86a832 CM |
221 | |
222 | static int block_group_bits(struct btrfs_block_group_cache *cache, u64 bits) | |
223 | { | |
593060d7 | 224 | return (cache->flags & bits) == bits; |
0b86a832 CM |
225 | } |
226 | ||
227 | static int noinline find_search_start(struct btrfs_root *root, | |
98ed5174 | 228 | struct btrfs_block_group_cache **cache_ret, |
0ef3e66b | 229 | u64 *start_ret, u64 num, int data) |
e37c9e69 | 230 | { |
e37c9e69 CM |
231 | int ret; |
232 | struct btrfs_block_group_cache *cache = *cache_ret; | |
d7fc640e | 233 | struct extent_io_tree *free_space_cache; |
7d1660d4 | 234 | struct extent_state *state; |
e19caa5f | 235 | u64 last; |
f510cfec | 236 | u64 start = 0; |
257d0ce3 | 237 | u64 cache_miss = 0; |
c31f8830 | 238 | u64 total_fs_bytes; |
0b86a832 | 239 | u64 search_start = *start_ret; |
f84a8b36 | 240 | int wrapped = 0; |
e37c9e69 | 241 | |
c31f8830 | 242 | total_fs_bytes = btrfs_super_total_bytes(&root->fs_info->super_copy); |
d7fc640e CM |
243 | free_space_cache = &root->fs_info->free_space_cache; |
244 | ||
0ef3e66b CM |
245 | if (!cache) |
246 | goto out; | |
247 | ||
e37c9e69 | 248 | again: |
54aa1f4d | 249 | ret = cache_block_group(root, cache); |
0ef3e66b | 250 | if (ret) { |
54aa1f4d | 251 | goto out; |
0ef3e66b | 252 | } |
f84a8b36 | 253 | |
e19caa5f | 254 | last = max(search_start, cache->key.objectid); |
0ef3e66b | 255 | if (!block_group_bits(cache, data) || cache->ro) |
0b86a832 | 256 | goto new_group; |
e19caa5f | 257 | |
7d1660d4 CM |
258 | spin_lock_irq(&free_space_cache->lock); |
259 | state = find_first_extent_bit_state(free_space_cache, last, EXTENT_DIRTY); | |
e37c9e69 | 260 | while(1) { |
7d1660d4 | 261 | if (!state) { |
257d0ce3 CM |
262 | if (!cache_miss) |
263 | cache_miss = last; | |
7d1660d4 | 264 | spin_unlock_irq(&free_space_cache->lock); |
e19caa5f CM |
265 | goto new_group; |
266 | } | |
f510cfec | 267 | |
7d1660d4 CM |
268 | start = max(last, state->start); |
269 | last = state->end + 1; | |
257d0ce3 | 270 | if (last - start < num) { |
7d1660d4 CM |
271 | do { |
272 | state = extent_state_next(state); | |
273 | } while(state && !(state->state & EXTENT_DIRTY)); | |
f510cfec | 274 | continue; |
257d0ce3 | 275 | } |
7d1660d4 | 276 | spin_unlock_irq(&free_space_cache->lock); |
0ef3e66b | 277 | if (cache->ro) { |
8f18cf13 | 278 | goto new_group; |
0ef3e66b | 279 | } |
0b86a832 | 280 | if (start + num > cache->key.objectid + cache->key.offset) |
e37c9e69 | 281 | goto new_group; |
8790d502 | 282 | if (!block_group_bits(cache, data)) { |
611f0e00 | 283 | printk("block group bits don't match %Lu %d\n", cache->flags, data); |
8790d502 | 284 | } |
0b86a832 CM |
285 | *start_ret = start; |
286 | return 0; | |
8790d502 CM |
287 | } |
288 | out: | |
1a2b2ac7 CM |
289 | cache = btrfs_lookup_block_group(root->fs_info, search_start); |
290 | if (!cache) { | |
0b86a832 | 291 | printk("Unable to find block group for %Lu\n", search_start); |
1a2b2ac7 | 292 | WARN_ON(1); |
1a2b2ac7 | 293 | } |
0b86a832 | 294 | return -ENOSPC; |
e37c9e69 CM |
295 | |
296 | new_group: | |
e19caa5f | 297 | last = cache->key.objectid + cache->key.offset; |
f84a8b36 | 298 | wrapped: |
0ef3e66b | 299 | cache = btrfs_lookup_first_block_group(root->fs_info, last); |
c31f8830 | 300 | if (!cache || cache->key.objectid >= total_fs_bytes) { |
0e4de584 | 301 | no_cache: |
f84a8b36 CM |
302 | if (!wrapped) { |
303 | wrapped = 1; | |
304 | last = search_start; | |
f84a8b36 CM |
305 | goto wrapped; |
306 | } | |
1a2b2ac7 | 307 | goto out; |
e37c9e69 | 308 | } |
257d0ce3 CM |
309 | if (cache_miss && !cache->cached) { |
310 | cache_block_group(root, cache); | |
311 | last = cache_miss; | |
0ef3e66b | 312 | cache = btrfs_lookup_first_block_group(root->fs_info, last); |
257d0ce3 | 313 | } |
0ef3e66b | 314 | cache_miss = 0; |
925baedd | 315 | cache = __btrfs_find_block_group(root, cache, last, data, 0); |
0e4de584 CM |
316 | if (!cache) |
317 | goto no_cache; | |
e37c9e69 CM |
318 | *cache_ret = cache; |
319 | goto again; | |
320 | } | |
321 | ||
84f54cfa CM |
322 | static u64 div_factor(u64 num, int factor) |
323 | { | |
257d0ce3 CM |
324 | if (factor == 10) |
325 | return num; | |
84f54cfa CM |
326 | num *= factor; |
327 | do_div(num, 10); | |
328 | return num; | |
329 | } | |
330 | ||
6324fbf3 CM |
331 | static int block_group_state_bits(u64 flags) |
332 | { | |
333 | int bits = 0; | |
334 | if (flags & BTRFS_BLOCK_GROUP_DATA) | |
335 | bits |= BLOCK_GROUP_DATA; | |
336 | if (flags & BTRFS_BLOCK_GROUP_METADATA) | |
337 | bits |= BLOCK_GROUP_METADATA; | |
338 | if (flags & BTRFS_BLOCK_GROUP_SYSTEM) | |
339 | bits |= BLOCK_GROUP_SYSTEM; | |
340 | return bits; | |
341 | } | |
342 | ||
925baedd CM |
343 | static struct btrfs_block_group_cache * |
344 | __btrfs_find_block_group(struct btrfs_root *root, | |
345 | struct btrfs_block_group_cache *hint, | |
346 | u64 search_start, int data, int owner) | |
cd1bc465 | 347 | { |
96b5179d | 348 | struct btrfs_block_group_cache *cache; |
d1310b2e | 349 | struct extent_io_tree *block_group_cache; |
31f3c99b | 350 | struct btrfs_block_group_cache *found_group = NULL; |
cd1bc465 CM |
351 | struct btrfs_fs_info *info = root->fs_info; |
352 | u64 used; | |
31f3c99b | 353 | u64 last = 0; |
96b5179d CM |
354 | u64 start; |
355 | u64 end; | |
356 | u64 free_check; | |
357 | u64 ptr; | |
358 | int bit; | |
cd1bc465 | 359 | int ret; |
31f3c99b | 360 | int full_search = 0; |
bce4eae9 | 361 | int factor = 10; |
0ef3e66b | 362 | int wrapped = 0; |
de428b63 | 363 | |
96b5179d CM |
364 | block_group_cache = &info->block_group_cache; |
365 | ||
a236aed1 CM |
366 | if (data & BTRFS_BLOCK_GROUP_METADATA) |
367 | factor = 9; | |
be744175 | 368 | |
6324fbf3 | 369 | bit = block_group_state_bits(data); |
be744175 | 370 | |
0ef3e66b | 371 | if (search_start) { |
be744175 | 372 | struct btrfs_block_group_cache *shint; |
0ef3e66b | 373 | shint = btrfs_lookup_first_block_group(info, search_start); |
8f18cf13 | 374 | if (shint && block_group_bits(shint, data) && !shint->ro) { |
be744175 | 375 | used = btrfs_block_group_used(&shint->item); |
324ae4df Y |
376 | if (used + shint->pinned < |
377 | div_factor(shint->key.offset, factor)) { | |
be744175 CM |
378 | return shint; |
379 | } | |
380 | } | |
381 | } | |
0ef3e66b | 382 | if (hint && !hint->ro && block_group_bits(hint, data)) { |
31f3c99b | 383 | used = btrfs_block_group_used(&hint->item); |
324ae4df Y |
384 | if (used + hint->pinned < |
385 | div_factor(hint->key.offset, factor)) { | |
31f3c99b CM |
386 | return hint; |
387 | } | |
e19caa5f | 388 | last = hint->key.objectid + hint->key.offset; |
31f3c99b | 389 | } else { |
e37c9e69 | 390 | if (hint) |
0ef3e66b | 391 | last = max(hint->key.objectid, search_start); |
e37c9e69 | 392 | else |
0ef3e66b | 393 | last = search_start; |
31f3c99b | 394 | } |
31f3c99b | 395 | again: |
cd1bc465 | 396 | while(1) { |
96b5179d CM |
397 | ret = find_first_extent_bit(block_group_cache, last, |
398 | &start, &end, bit); | |
399 | if (ret) | |
cd1bc465 | 400 | break; |
96b5179d CM |
401 | |
402 | ret = get_state_private(block_group_cache, start, &ptr); | |
0ef3e66b CM |
403 | if (ret) { |
404 | last = end + 1; | |
405 | continue; | |
406 | } | |
96b5179d | 407 | |
ae2f5411 | 408 | cache = (struct btrfs_block_group_cache *)(unsigned long)ptr; |
96b5179d CM |
409 | last = cache->key.objectid + cache->key.offset; |
410 | used = btrfs_block_group_used(&cache->item); | |
411 | ||
8f18cf13 | 412 | if (!cache->ro && block_group_bits(cache, data)) { |
0ef3e66b | 413 | free_check = div_factor(cache->key.offset, factor); |
8790d502 CM |
414 | if (used + cache->pinned < free_check) { |
415 | found_group = cache; | |
416 | goto found; | |
417 | } | |
6324fbf3 | 418 | } |
de428b63 | 419 | cond_resched(); |
cd1bc465 | 420 | } |
0ef3e66b CM |
421 | if (!wrapped) { |
422 | last = search_start; | |
423 | wrapped = 1; | |
424 | goto again; | |
425 | } | |
426 | if (!full_search && factor < 10) { | |
be744175 | 427 | last = search_start; |
31f3c99b | 428 | full_search = 1; |
0ef3e66b | 429 | factor = 10; |
31f3c99b CM |
430 | goto again; |
431 | } | |
be744175 | 432 | found: |
31f3c99b | 433 | return found_group; |
cd1bc465 CM |
434 | } |
435 | ||
925baedd CM |
436 | struct btrfs_block_group_cache *btrfs_find_block_group(struct btrfs_root *root, |
437 | struct btrfs_block_group_cache | |
438 | *hint, u64 search_start, | |
439 | int data, int owner) | |
440 | { | |
441 | ||
442 | struct btrfs_block_group_cache *ret; | |
443 | mutex_lock(&root->fs_info->alloc_mutex); | |
444 | ret = __btrfs_find_block_group(root, hint, search_start, data, owner); | |
445 | mutex_unlock(&root->fs_info->alloc_mutex); | |
446 | return ret; | |
447 | } | |
7bb86316 | 448 | static u64 hash_extent_ref(u64 root_objectid, u64 ref_generation, |
74493f7a CM |
449 | u64 owner, u64 owner_offset) |
450 | { | |
451 | u32 high_crc = ~(u32)0; | |
452 | u32 low_crc = ~(u32)0; | |
453 | __le64 lenum; | |
74493f7a | 454 | lenum = cpu_to_le64(root_objectid); |
a5eb62e3 | 455 | high_crc = btrfs_crc32c(high_crc, &lenum, sizeof(lenum)); |
7bb86316 | 456 | lenum = cpu_to_le64(ref_generation); |
a5eb62e3 | 457 | low_crc = btrfs_crc32c(low_crc, &lenum, sizeof(lenum)); |
21a4989d CM |
458 | if (owner >= BTRFS_FIRST_FREE_OBJECTID) { |
459 | lenum = cpu_to_le64(owner); | |
a5eb62e3 | 460 | low_crc = btrfs_crc32c(low_crc, &lenum, sizeof(lenum)); |
21a4989d | 461 | lenum = cpu_to_le64(owner_offset); |
a5eb62e3 | 462 | low_crc = btrfs_crc32c(low_crc, &lenum, sizeof(lenum)); |
21a4989d | 463 | } |
74493f7a CM |
464 | return ((u64)high_crc << 32) | (u64)low_crc; |
465 | } | |
466 | ||
7bb86316 CM |
467 | static int match_extent_ref(struct extent_buffer *leaf, |
468 | struct btrfs_extent_ref *disk_ref, | |
469 | struct btrfs_extent_ref *cpu_ref) | |
470 | { | |
471 | int ret; | |
472 | int len; | |
473 | ||
474 | if (cpu_ref->objectid) | |
475 | len = sizeof(*cpu_ref); | |
476 | else | |
477 | len = 2 * sizeof(u64); | |
478 | ret = memcmp_extent_buffer(leaf, cpu_ref, (unsigned long)disk_ref, | |
479 | len); | |
480 | return ret == 0; | |
481 | } | |
482 | ||
98ed5174 CM |
483 | static int noinline lookup_extent_backref(struct btrfs_trans_handle *trans, |
484 | struct btrfs_root *root, | |
485 | struct btrfs_path *path, u64 bytenr, | |
486 | u64 root_objectid, | |
487 | u64 ref_generation, u64 owner, | |
488 | u64 owner_offset, int del) | |
74493f7a CM |
489 | { |
490 | u64 hash; | |
491 | struct btrfs_key key; | |
7bb86316 | 492 | struct btrfs_key found_key; |
74493f7a | 493 | struct btrfs_extent_ref ref; |
7bb86316 CM |
494 | struct extent_buffer *leaf; |
495 | struct btrfs_extent_ref *disk_ref; | |
496 | int ret; | |
497 | int ret2; | |
498 | ||
499 | btrfs_set_stack_ref_root(&ref, root_objectid); | |
500 | btrfs_set_stack_ref_generation(&ref, ref_generation); | |
501 | btrfs_set_stack_ref_objectid(&ref, owner); | |
502 | btrfs_set_stack_ref_offset(&ref, owner_offset); | |
503 | ||
504 | hash = hash_extent_ref(root_objectid, ref_generation, owner, | |
505 | owner_offset); | |
506 | key.offset = hash; | |
507 | key.objectid = bytenr; | |
508 | key.type = BTRFS_EXTENT_REF_KEY; | |
509 | ||
510 | while (1) { | |
511 | ret = btrfs_search_slot(trans, root, &key, path, | |
512 | del ? -1 : 0, del); | |
513 | if (ret < 0) | |
514 | goto out; | |
515 | leaf = path->nodes[0]; | |
516 | if (ret != 0) { | |
517 | u32 nritems = btrfs_header_nritems(leaf); | |
518 | if (path->slots[0] >= nritems) { | |
519 | ret2 = btrfs_next_leaf(root, path); | |
520 | if (ret2) | |
521 | goto out; | |
522 | leaf = path->nodes[0]; | |
523 | } | |
524 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); | |
525 | if (found_key.objectid != bytenr || | |
526 | found_key.type != BTRFS_EXTENT_REF_KEY) | |
527 | goto out; | |
528 | key.offset = found_key.offset; | |
529 | if (del) { | |
530 | btrfs_release_path(root, path); | |
531 | continue; | |
532 | } | |
533 | } | |
534 | disk_ref = btrfs_item_ptr(path->nodes[0], | |
535 | path->slots[0], | |
536 | struct btrfs_extent_ref); | |
537 | if (match_extent_ref(path->nodes[0], disk_ref, &ref)) { | |
538 | ret = 0; | |
539 | goto out; | |
540 | } | |
541 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); | |
542 | key.offset = found_key.offset + 1; | |
543 | btrfs_release_path(root, path); | |
544 | } | |
545 | out: | |
546 | return ret; | |
547 | } | |
548 | ||
d8d5f3e1 CM |
549 | /* |
550 | * Back reference rules. Back refs have three main goals: | |
551 | * | |
552 | * 1) differentiate between all holders of references to an extent so that | |
553 | * when a reference is dropped we can make sure it was a valid reference | |
554 | * before freeing the extent. | |
555 | * | |
556 | * 2) Provide enough information to quickly find the holders of an extent | |
557 | * if we notice a given block is corrupted or bad. | |
558 | * | |
559 | * 3) Make it easy to migrate blocks for FS shrinking or storage pool | |
560 | * maintenance. This is actually the same as #2, but with a slightly | |
561 | * different use case. | |
562 | * | |
563 | * File extents can be referenced by: | |
564 | * | |
565 | * - multiple snapshots, subvolumes, or different generations in one subvol | |
566 | * - different files inside a single subvolume (in theory, not implemented yet) | |
567 | * - different offsets inside a file (bookend extents in file.c) | |
568 | * | |
569 | * The extent ref structure has fields for: | |
570 | * | |
571 | * - Objectid of the subvolume root | |
572 | * - Generation number of the tree holding the reference | |
573 | * - objectid of the file holding the reference | |
574 | * - offset in the file corresponding to the key holding the reference | |
575 | * | |
576 | * When a file extent is allocated the fields are filled in: | |
577 | * (root_key.objectid, trans->transid, inode objectid, offset in file) | |
578 | * | |
579 | * When a leaf is cow'd new references are added for every file extent found | |
580 | * in the leaf. It looks the same as the create case, but trans->transid | |
581 | * will be different when the block is cow'd. | |
582 | * | |
583 | * (root_key.objectid, trans->transid, inode objectid, offset in file) | |
584 | * | |
585 | * When a file extent is removed either during snapshot deletion or file | |
586 | * truncation, the corresponding back reference is found | |
587 | * by searching for: | |
588 | * | |
589 | * (btrfs_header_owner(leaf), btrfs_header_generation(leaf), | |
590 | * inode objectid, offset in file) | |
591 | * | |
592 | * Btree extents can be referenced by: | |
593 | * | |
594 | * - Different subvolumes | |
595 | * - Different generations of the same subvolume | |
596 | * | |
597 | * Storing sufficient information for a full reverse mapping of a btree | |
598 | * block would require storing the lowest key of the block in the backref, | |
599 | * and it would require updating that lowest key either before write out or | |
600 | * every time it changed. Instead, the objectid of the lowest key is stored | |
601 | * along with the level of the tree block. This provides a hint | |
602 | * about where in the btree the block can be found. Searches through the | |
603 | * btree only need to look for a pointer to that block, so they stop one | |
604 | * level higher than the level recorded in the backref. | |
605 | * | |
606 | * Some btrees do not do reference counting on their extents. These | |
607 | * include the extent tree and the tree of tree roots. Backrefs for these | |
608 | * trees always have a generation of zero. | |
609 | * | |
610 | * When a tree block is created, back references are inserted: | |
611 | * | |
f6dbff55 | 612 | * (root->root_key.objectid, trans->transid or zero, level, lowest_key_objectid) |
d8d5f3e1 CM |
613 | * |
614 | * When a tree block is cow'd in a reference counted root, | |
615 | * new back references are added for all the blocks it points to. | |
616 | * These are of the form (trans->transid will have increased since creation): | |
617 | * | |
f6dbff55 | 618 | * (root->root_key.objectid, trans->transid, level, lowest_key_objectid) |
d8d5f3e1 CM |
619 | * |
620 | * Because the lowest_key_objectid and the level are just hints | |
621 | * they are not used when backrefs are deleted. When a backref is deleted: | |
622 | * | |
623 | * if backref was for a tree root: | |
624 | * root_objectid = root->root_key.objectid | |
625 | * else | |
626 | * root_objectid = btrfs_header_owner(parent) | |
627 | * | |
628 | * (root_objectid, btrfs_header_generation(parent) or zero, 0, 0) | |
629 | * | |
630 | * Back Reference Key hashing: | |
631 | * | |
632 | * Back references have four fields, each 64 bits long. Unfortunately, | |
633 | * This is hashed into a single 64 bit number and placed into the key offset. | |
634 | * The key objectid corresponds to the first byte in the extent, and the | |
635 | * key type is set to BTRFS_EXTENT_REF_KEY | |
636 | */ | |
7bb86316 CM |
637 | int btrfs_insert_extent_backref(struct btrfs_trans_handle *trans, |
638 | struct btrfs_root *root, | |
639 | struct btrfs_path *path, u64 bytenr, | |
640 | u64 root_objectid, u64 ref_generation, | |
641 | u64 owner, u64 owner_offset) | |
642 | { | |
643 | u64 hash; | |
644 | struct btrfs_key key; | |
645 | struct btrfs_extent_ref ref; | |
646 | struct btrfs_extent_ref *disk_ref; | |
74493f7a CM |
647 | int ret; |
648 | ||
649 | btrfs_set_stack_ref_root(&ref, root_objectid); | |
7bb86316 | 650 | btrfs_set_stack_ref_generation(&ref, ref_generation); |
74493f7a CM |
651 | btrfs_set_stack_ref_objectid(&ref, owner); |
652 | btrfs_set_stack_ref_offset(&ref, owner_offset); | |
653 | ||
7bb86316 CM |
654 | hash = hash_extent_ref(root_objectid, ref_generation, owner, |
655 | owner_offset); | |
74493f7a CM |
656 | key.offset = hash; |
657 | key.objectid = bytenr; | |
658 | key.type = BTRFS_EXTENT_REF_KEY; | |
659 | ||
660 | ret = btrfs_insert_empty_item(trans, root, path, &key, sizeof(ref)); | |
661 | while (ret == -EEXIST) { | |
7bb86316 CM |
662 | disk_ref = btrfs_item_ptr(path->nodes[0], path->slots[0], |
663 | struct btrfs_extent_ref); | |
664 | if (match_extent_ref(path->nodes[0], disk_ref, &ref)) | |
665 | goto out; | |
666 | key.offset++; | |
667 | btrfs_release_path(root, path); | |
668 | ret = btrfs_insert_empty_item(trans, root, path, &key, | |
669 | sizeof(ref)); | |
74493f7a | 670 | } |
7bb86316 CM |
671 | if (ret) |
672 | goto out; | |
673 | disk_ref = btrfs_item_ptr(path->nodes[0], path->slots[0], | |
674 | struct btrfs_extent_ref); | |
675 | write_extent_buffer(path->nodes[0], &ref, (unsigned long)disk_ref, | |
676 | sizeof(ref)); | |
677 | btrfs_mark_buffer_dirty(path->nodes[0]); | |
678 | out: | |
679 | btrfs_release_path(root, path); | |
680 | return ret; | |
74493f7a CM |
681 | } |
682 | ||
925baedd | 683 | static int __btrfs_inc_extent_ref(struct btrfs_trans_handle *trans, |
b18c6685 | 684 | struct btrfs_root *root, |
74493f7a | 685 | u64 bytenr, u64 num_bytes, |
7bb86316 | 686 | u64 root_objectid, u64 ref_generation, |
74493f7a | 687 | u64 owner, u64 owner_offset) |
02217ed2 | 688 | { |
5caf2a00 | 689 | struct btrfs_path *path; |
02217ed2 | 690 | int ret; |
e2fa7227 | 691 | struct btrfs_key key; |
5f39d397 | 692 | struct extent_buffer *l; |
234b63a0 | 693 | struct btrfs_extent_item *item; |
cf27e1ee | 694 | u32 refs; |
037e6390 | 695 | |
db94535d | 696 | WARN_ON(num_bytes < root->sectorsize); |
5caf2a00 | 697 | path = btrfs_alloc_path(); |
54aa1f4d CM |
698 | if (!path) |
699 | return -ENOMEM; | |
26b8003f | 700 | |
3c12ac72 | 701 | path->reada = 1; |
db94535d | 702 | key.objectid = bytenr; |
62e2749e | 703 | btrfs_set_key_type(&key, BTRFS_EXTENT_ITEM_KEY); |
db94535d | 704 | key.offset = num_bytes; |
5caf2a00 | 705 | ret = btrfs_search_slot(trans, root->fs_info->extent_root, &key, path, |
9f5fae2f | 706 | 0, 1); |
54aa1f4d CM |
707 | if (ret < 0) |
708 | return ret; | |
a429e513 | 709 | if (ret != 0) { |
a28ec197 | 710 | BUG(); |
a429e513 | 711 | } |
02217ed2 | 712 | BUG_ON(ret != 0); |
5f39d397 | 713 | l = path->nodes[0]; |
5caf2a00 | 714 | item = btrfs_item_ptr(l, path->slots[0], struct btrfs_extent_item); |
5f39d397 CM |
715 | refs = btrfs_extent_refs(l, item); |
716 | btrfs_set_extent_refs(l, item, refs + 1); | |
5caf2a00 | 717 | btrfs_mark_buffer_dirty(path->nodes[0]); |
a28ec197 | 718 | |
5caf2a00 | 719 | btrfs_release_path(root->fs_info->extent_root, path); |
7bb86316 | 720 | |
3c12ac72 | 721 | path->reada = 1; |
7bb86316 CM |
722 | ret = btrfs_insert_extent_backref(trans, root->fs_info->extent_root, |
723 | path, bytenr, root_objectid, | |
724 | ref_generation, owner, owner_offset); | |
725 | BUG_ON(ret); | |
9f5fae2f | 726 | finish_current_insert(trans, root->fs_info->extent_root); |
e20d96d6 | 727 | del_pending_extents(trans, root->fs_info->extent_root); |
74493f7a CM |
728 | |
729 | btrfs_free_path(path); | |
02217ed2 CM |
730 | return 0; |
731 | } | |
732 | ||
925baedd CM |
733 | int btrfs_inc_extent_ref(struct btrfs_trans_handle *trans, |
734 | struct btrfs_root *root, | |
735 | u64 bytenr, u64 num_bytes, | |
736 | u64 root_objectid, u64 ref_generation, | |
737 | u64 owner, u64 owner_offset) | |
738 | { | |
739 | int ret; | |
740 | ||
741 | mutex_lock(&root->fs_info->alloc_mutex); | |
742 | ret = __btrfs_inc_extent_ref(trans, root, bytenr, num_bytes, | |
743 | root_objectid, ref_generation, | |
744 | owner, owner_offset); | |
745 | mutex_unlock(&root->fs_info->alloc_mutex); | |
746 | return ret; | |
747 | } | |
748 | ||
e9d0b13b CM |
749 | int btrfs_extent_post_op(struct btrfs_trans_handle *trans, |
750 | struct btrfs_root *root) | |
751 | { | |
752 | finish_current_insert(trans, root->fs_info->extent_root); | |
753 | del_pending_extents(trans, root->fs_info->extent_root); | |
754 | return 0; | |
755 | } | |
756 | ||
b18c6685 | 757 | static int lookup_extent_ref(struct btrfs_trans_handle *trans, |
db94535d CM |
758 | struct btrfs_root *root, u64 bytenr, |
759 | u64 num_bytes, u32 *refs) | |
a28ec197 | 760 | { |
5caf2a00 | 761 | struct btrfs_path *path; |
a28ec197 | 762 | int ret; |
e2fa7227 | 763 | struct btrfs_key key; |
5f39d397 | 764 | struct extent_buffer *l; |
234b63a0 | 765 | struct btrfs_extent_item *item; |
5caf2a00 | 766 | |
db94535d | 767 | WARN_ON(num_bytes < root->sectorsize); |
5caf2a00 | 768 | path = btrfs_alloc_path(); |
3c12ac72 | 769 | path->reada = 1; |
db94535d CM |
770 | key.objectid = bytenr; |
771 | key.offset = num_bytes; | |
62e2749e | 772 | btrfs_set_key_type(&key, BTRFS_EXTENT_ITEM_KEY); |
5caf2a00 | 773 | ret = btrfs_search_slot(trans, root->fs_info->extent_root, &key, path, |
9f5fae2f | 774 | 0, 0); |
54aa1f4d CM |
775 | if (ret < 0) |
776 | goto out; | |
5f39d397 CM |
777 | if (ret != 0) { |
778 | btrfs_print_leaf(root, path->nodes[0]); | |
db94535d | 779 | printk("failed to find block number %Lu\n", bytenr); |
a28ec197 | 780 | BUG(); |
5f39d397 CM |
781 | } |
782 | l = path->nodes[0]; | |
5caf2a00 | 783 | item = btrfs_item_ptr(l, path->slots[0], struct btrfs_extent_item); |
5f39d397 | 784 | *refs = btrfs_extent_refs(l, item); |
54aa1f4d | 785 | out: |
5caf2a00 | 786 | btrfs_free_path(path); |
a28ec197 CM |
787 | return 0; |
788 | } | |
789 | ||
be20aa9d CM |
790 | u32 btrfs_count_snapshots_in_path(struct btrfs_root *root, |
791 | struct btrfs_path *count_path, | |
a68d5933 | 792 | u64 expected_owner, |
be20aa9d CM |
793 | u64 first_extent) |
794 | { | |
795 | struct btrfs_root *extent_root = root->fs_info->extent_root; | |
796 | struct btrfs_path *path; | |
797 | u64 bytenr; | |
798 | u64 found_objectid; | |
a68d5933 | 799 | u64 found_owner; |
56b453c9 | 800 | u64 root_objectid = root->root_key.objectid; |
be20aa9d | 801 | u32 total_count = 0; |
bbaf549e | 802 | u32 extent_refs; |
be20aa9d | 803 | u32 cur_count; |
be20aa9d CM |
804 | u32 nritems; |
805 | int ret; | |
806 | struct btrfs_key key; | |
807 | struct btrfs_key found_key; | |
808 | struct extent_buffer *l; | |
809 | struct btrfs_extent_item *item; | |
810 | struct btrfs_extent_ref *ref_item; | |
811 | int level = -1; | |
812 | ||
925baedd CM |
813 | /* FIXME, needs locking */ |
814 | BUG(); | |
815 | ||
816 | mutex_lock(&root->fs_info->alloc_mutex); | |
be20aa9d CM |
817 | path = btrfs_alloc_path(); |
818 | again: | |
819 | if (level == -1) | |
820 | bytenr = first_extent; | |
821 | else | |
822 | bytenr = count_path->nodes[level]->start; | |
823 | ||
824 | cur_count = 0; | |
825 | key.objectid = bytenr; | |
826 | key.offset = 0; | |
827 | ||
828 | btrfs_set_key_type(&key, BTRFS_EXTENT_ITEM_KEY); | |
829 | ret = btrfs_search_slot(NULL, extent_root, &key, path, 0, 0); | |
830 | if (ret < 0) | |
831 | goto out; | |
832 | BUG_ON(ret == 0); | |
833 | ||
834 | l = path->nodes[0]; | |
835 | btrfs_item_key_to_cpu(l, &found_key, path->slots[0]); | |
836 | ||
837 | if (found_key.objectid != bytenr || | |
838 | found_key.type != BTRFS_EXTENT_ITEM_KEY) { | |
839 | goto out; | |
840 | } | |
841 | ||
842 | item = btrfs_item_ptr(l, path->slots[0], struct btrfs_extent_item); | |
bbaf549e | 843 | extent_refs = btrfs_extent_refs(l, item); |
be20aa9d | 844 | while (1) { |
bd09835d | 845 | l = path->nodes[0]; |
be20aa9d CM |
846 | nritems = btrfs_header_nritems(l); |
847 | if (path->slots[0] >= nritems) { | |
848 | ret = btrfs_next_leaf(extent_root, path); | |
849 | if (ret == 0) | |
850 | continue; | |
851 | break; | |
852 | } | |
853 | btrfs_item_key_to_cpu(l, &found_key, path->slots[0]); | |
854 | if (found_key.objectid != bytenr) | |
855 | break; | |
bd09835d | 856 | |
be20aa9d CM |
857 | if (found_key.type != BTRFS_EXTENT_REF_KEY) { |
858 | path->slots[0]++; | |
859 | continue; | |
860 | } | |
861 | ||
862 | cur_count++; | |
863 | ref_item = btrfs_item_ptr(l, path->slots[0], | |
864 | struct btrfs_extent_ref); | |
865 | found_objectid = btrfs_ref_root(l, ref_item); | |
866 | ||
56b453c9 CM |
867 | if (found_objectid != root_objectid) { |
868 | total_count = 2; | |
4313b399 | 869 | goto out; |
56b453c9 | 870 | } |
a68d5933 CM |
871 | if (level == -1) { |
872 | found_owner = btrfs_ref_objectid(l, ref_item); | |
873 | if (found_owner != expected_owner) { | |
874 | total_count = 2; | |
875 | goto out; | |
876 | } | |
bbaf549e CM |
877 | /* |
878 | * nasty. we don't count a reference held by | |
879 | * the running transaction. This allows nodatacow | |
880 | * to avoid cow most of the time | |
881 | */ | |
882 | if (found_owner >= BTRFS_FIRST_FREE_OBJECTID && | |
883 | btrfs_ref_generation(l, ref_item) == | |
884 | root->fs_info->generation) { | |
885 | extent_refs--; | |
886 | } | |
a68d5933 | 887 | } |
56b453c9 | 888 | total_count = 1; |
be20aa9d CM |
889 | path->slots[0]++; |
890 | } | |
bbaf549e CM |
891 | /* |
892 | * if there is more than one reference against a data extent, | |
893 | * we have to assume the other ref is another snapshot | |
894 | */ | |
895 | if (level == -1 && extent_refs > 1) { | |
896 | total_count = 2; | |
897 | goto out; | |
898 | } | |
be20aa9d CM |
899 | if (cur_count == 0) { |
900 | total_count = 0; | |
901 | goto out; | |
902 | } | |
be20aa9d CM |
903 | if (level >= 0 && root->node == count_path->nodes[level]) |
904 | goto out; | |
905 | level++; | |
906 | btrfs_release_path(root, path); | |
907 | goto again; | |
908 | ||
909 | out: | |
910 | btrfs_free_path(path); | |
925baedd | 911 | mutex_unlock(&root->fs_info->alloc_mutex); |
be20aa9d | 912 | return total_count; |
be20aa9d | 913 | } |
c5739bba | 914 | |
e089f05c | 915 | int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root, |
5f39d397 | 916 | struct extent_buffer *buf) |
02217ed2 | 917 | { |
db94535d | 918 | u64 bytenr; |
5f39d397 CM |
919 | u32 nritems; |
920 | struct btrfs_key key; | |
6407bf6d | 921 | struct btrfs_file_extent_item *fi; |
02217ed2 | 922 | int i; |
db94535d | 923 | int level; |
6407bf6d | 924 | int ret; |
54aa1f4d | 925 | int faili; |
a28ec197 | 926 | |
3768f368 | 927 | if (!root->ref_cows) |
a28ec197 | 928 | return 0; |
5f39d397 | 929 | |
925baedd | 930 | mutex_lock(&root->fs_info->alloc_mutex); |
db94535d | 931 | level = btrfs_header_level(buf); |
5f39d397 CM |
932 | nritems = btrfs_header_nritems(buf); |
933 | for (i = 0; i < nritems; i++) { | |
db94535d CM |
934 | if (level == 0) { |
935 | u64 disk_bytenr; | |
5f39d397 CM |
936 | btrfs_item_key_to_cpu(buf, &key, i); |
937 | if (btrfs_key_type(&key) != BTRFS_EXTENT_DATA_KEY) | |
6407bf6d | 938 | continue; |
5f39d397 | 939 | fi = btrfs_item_ptr(buf, i, |
6407bf6d | 940 | struct btrfs_file_extent_item); |
5f39d397 | 941 | if (btrfs_file_extent_type(buf, fi) == |
236454df CM |
942 | BTRFS_FILE_EXTENT_INLINE) |
943 | continue; | |
db94535d CM |
944 | disk_bytenr = btrfs_file_extent_disk_bytenr(buf, fi); |
945 | if (disk_bytenr == 0) | |
3a686375 | 946 | continue; |
925baedd | 947 | ret = __btrfs_inc_extent_ref(trans, root, disk_bytenr, |
7bb86316 CM |
948 | btrfs_file_extent_disk_num_bytes(buf, fi), |
949 | root->root_key.objectid, trans->transid, | |
950 | key.objectid, key.offset); | |
54aa1f4d CM |
951 | if (ret) { |
952 | faili = i; | |
953 | goto fail; | |
954 | } | |
6407bf6d | 955 | } else { |
db94535d | 956 | bytenr = btrfs_node_blockptr(buf, i); |
6caab489 | 957 | btrfs_node_key_to_cpu(buf, &key, i); |
925baedd | 958 | ret = __btrfs_inc_extent_ref(trans, root, bytenr, |
7bb86316 CM |
959 | btrfs_level_size(root, level - 1), |
960 | root->root_key.objectid, | |
f6dbff55 CM |
961 | trans->transid, |
962 | level - 1, key.objectid); | |
54aa1f4d CM |
963 | if (ret) { |
964 | faili = i; | |
965 | goto fail; | |
966 | } | |
6407bf6d | 967 | } |
02217ed2 | 968 | } |
925baedd | 969 | mutex_unlock(&root->fs_info->alloc_mutex); |
02217ed2 | 970 | return 0; |
54aa1f4d | 971 | fail: |
ccd467d6 | 972 | WARN_ON(1); |
7bb86316 | 973 | #if 0 |
54aa1f4d | 974 | for (i =0; i < faili; i++) { |
db94535d CM |
975 | if (level == 0) { |
976 | u64 disk_bytenr; | |
5f39d397 CM |
977 | btrfs_item_key_to_cpu(buf, &key, i); |
978 | if (btrfs_key_type(&key) != BTRFS_EXTENT_DATA_KEY) | |
54aa1f4d | 979 | continue; |
5f39d397 | 980 | fi = btrfs_item_ptr(buf, i, |
54aa1f4d | 981 | struct btrfs_file_extent_item); |
5f39d397 | 982 | if (btrfs_file_extent_type(buf, fi) == |
54aa1f4d CM |
983 | BTRFS_FILE_EXTENT_INLINE) |
984 | continue; | |
db94535d CM |
985 | disk_bytenr = btrfs_file_extent_disk_bytenr(buf, fi); |
986 | if (disk_bytenr == 0) | |
54aa1f4d | 987 | continue; |
db94535d CM |
988 | err = btrfs_free_extent(trans, root, disk_bytenr, |
989 | btrfs_file_extent_disk_num_bytes(buf, | |
5f39d397 | 990 | fi), 0); |
54aa1f4d CM |
991 | BUG_ON(err); |
992 | } else { | |
db94535d CM |
993 | bytenr = btrfs_node_blockptr(buf, i); |
994 | err = btrfs_free_extent(trans, root, bytenr, | |
995 | btrfs_level_size(root, level - 1), 0); | |
54aa1f4d CM |
996 | BUG_ON(err); |
997 | } | |
998 | } | |
7bb86316 | 999 | #endif |
925baedd | 1000 | mutex_unlock(&root->fs_info->alloc_mutex); |
54aa1f4d | 1001 | return ret; |
02217ed2 CM |
1002 | } |
1003 | ||
9078a3e1 CM |
1004 | static int write_one_cache_group(struct btrfs_trans_handle *trans, |
1005 | struct btrfs_root *root, | |
1006 | struct btrfs_path *path, | |
1007 | struct btrfs_block_group_cache *cache) | |
1008 | { | |
1009 | int ret; | |
1010 | int pending_ret; | |
1011 | struct btrfs_root *extent_root = root->fs_info->extent_root; | |
5f39d397 CM |
1012 | unsigned long bi; |
1013 | struct extent_buffer *leaf; | |
9078a3e1 | 1014 | |
9078a3e1 | 1015 | ret = btrfs_search_slot(trans, extent_root, &cache->key, path, 0, 1); |
54aa1f4d CM |
1016 | if (ret < 0) |
1017 | goto fail; | |
9078a3e1 | 1018 | BUG_ON(ret); |
5f39d397 CM |
1019 | |
1020 | leaf = path->nodes[0]; | |
1021 | bi = btrfs_item_ptr_offset(leaf, path->slots[0]); | |
1022 | write_extent_buffer(leaf, &cache->item, bi, sizeof(cache->item)); | |
1023 | btrfs_mark_buffer_dirty(leaf); | |
9078a3e1 | 1024 | btrfs_release_path(extent_root, path); |
54aa1f4d | 1025 | fail: |
9078a3e1 CM |
1026 | finish_current_insert(trans, extent_root); |
1027 | pending_ret = del_pending_extents(trans, extent_root); | |
1028 | if (ret) | |
1029 | return ret; | |
1030 | if (pending_ret) | |
1031 | return pending_ret; | |
1032 | return 0; | |
1033 | ||
1034 | } | |
1035 | ||
96b5179d CM |
1036 | int btrfs_write_dirty_block_groups(struct btrfs_trans_handle *trans, |
1037 | struct btrfs_root *root) | |
9078a3e1 | 1038 | { |
d1310b2e | 1039 | struct extent_io_tree *block_group_cache; |
96b5179d | 1040 | struct btrfs_block_group_cache *cache; |
9078a3e1 CM |
1041 | int ret; |
1042 | int err = 0; | |
1043 | int werr = 0; | |
9078a3e1 | 1044 | struct btrfs_path *path; |
96b5179d CM |
1045 | u64 last = 0; |
1046 | u64 start; | |
1047 | u64 end; | |
1048 | u64 ptr; | |
9078a3e1 | 1049 | |
96b5179d | 1050 | block_group_cache = &root->fs_info->block_group_cache; |
9078a3e1 CM |
1051 | path = btrfs_alloc_path(); |
1052 | if (!path) | |
1053 | return -ENOMEM; | |
1054 | ||
925baedd | 1055 | mutex_lock(&root->fs_info->alloc_mutex); |
9078a3e1 | 1056 | while(1) { |
96b5179d CM |
1057 | ret = find_first_extent_bit(block_group_cache, last, |
1058 | &start, &end, BLOCK_GROUP_DIRTY); | |
1059 | if (ret) | |
9078a3e1 | 1060 | break; |
54aa1f4d | 1061 | |
96b5179d CM |
1062 | last = end + 1; |
1063 | ret = get_state_private(block_group_cache, start, &ptr); | |
1064 | if (ret) | |
1065 | break; | |
ae2f5411 | 1066 | cache = (struct btrfs_block_group_cache *)(unsigned long)ptr; |
96b5179d CM |
1067 | err = write_one_cache_group(trans, root, |
1068 | path, cache); | |
1069 | /* | |
1070 | * if we fail to write the cache group, we want | |
1071 | * to keep it marked dirty in hopes that a later | |
1072 | * write will work | |
1073 | */ | |
1074 | if (err) { | |
1075 | werr = err; | |
1076 | continue; | |
9078a3e1 | 1077 | } |
96b5179d CM |
1078 | clear_extent_bits(block_group_cache, start, end, |
1079 | BLOCK_GROUP_DIRTY, GFP_NOFS); | |
9078a3e1 CM |
1080 | } |
1081 | btrfs_free_path(path); | |
925baedd | 1082 | mutex_unlock(&root->fs_info->alloc_mutex); |
9078a3e1 CM |
1083 | return werr; |
1084 | } | |
1085 | ||
6324fbf3 CM |
1086 | static struct btrfs_space_info *__find_space_info(struct btrfs_fs_info *info, |
1087 | u64 flags) | |
1088 | { | |
1089 | struct list_head *head = &info->space_info; | |
1090 | struct list_head *cur; | |
1091 | struct btrfs_space_info *found; | |
1092 | list_for_each(cur, head) { | |
1093 | found = list_entry(cur, struct btrfs_space_info, list); | |
1094 | if (found->flags == flags) | |
1095 | return found; | |
1096 | } | |
1097 | return NULL; | |
1098 | ||
1099 | } | |
1100 | ||
593060d7 CM |
1101 | static int update_space_info(struct btrfs_fs_info *info, u64 flags, |
1102 | u64 total_bytes, u64 bytes_used, | |
1103 | struct btrfs_space_info **space_info) | |
1104 | { | |
1105 | struct btrfs_space_info *found; | |
1106 | ||
1107 | found = __find_space_info(info, flags); | |
1108 | if (found) { | |
1109 | found->total_bytes += total_bytes; | |
1110 | found->bytes_used += bytes_used; | |
8f18cf13 | 1111 | found->full = 0; |
593060d7 CM |
1112 | WARN_ON(found->total_bytes < found->bytes_used); |
1113 | *space_info = found; | |
1114 | return 0; | |
1115 | } | |
1116 | found = kmalloc(sizeof(*found), GFP_NOFS); | |
1117 | if (!found) | |
1118 | return -ENOMEM; | |
1119 | ||
1120 | list_add(&found->list, &info->space_info); | |
1121 | found->flags = flags; | |
1122 | found->total_bytes = total_bytes; | |
1123 | found->bytes_used = bytes_used; | |
1124 | found->bytes_pinned = 0; | |
1125 | found->full = 0; | |
0ef3e66b | 1126 | found->force_alloc = 0; |
593060d7 CM |
1127 | *space_info = found; |
1128 | return 0; | |
1129 | } | |
1130 | ||
8790d502 CM |
1131 | static void set_avail_alloc_bits(struct btrfs_fs_info *fs_info, u64 flags) |
1132 | { | |
1133 | u64 extra_flags = flags & (BTRFS_BLOCK_GROUP_RAID0 | | |
611f0e00 | 1134 | BTRFS_BLOCK_GROUP_RAID1 | |
321aecc6 | 1135 | BTRFS_BLOCK_GROUP_RAID10 | |
611f0e00 | 1136 | BTRFS_BLOCK_GROUP_DUP); |
8790d502 CM |
1137 | if (extra_flags) { |
1138 | if (flags & BTRFS_BLOCK_GROUP_DATA) | |
1139 | fs_info->avail_data_alloc_bits |= extra_flags; | |
1140 | if (flags & BTRFS_BLOCK_GROUP_METADATA) | |
1141 | fs_info->avail_metadata_alloc_bits |= extra_flags; | |
1142 | if (flags & BTRFS_BLOCK_GROUP_SYSTEM) | |
1143 | fs_info->avail_system_alloc_bits |= extra_flags; | |
1144 | } | |
1145 | } | |
593060d7 | 1146 | |
a061fc8d | 1147 | static u64 reduce_alloc_profile(struct btrfs_root *root, u64 flags) |
ec44a35c | 1148 | { |
a061fc8d CM |
1149 | u64 num_devices = root->fs_info->fs_devices->num_devices; |
1150 | ||
1151 | if (num_devices == 1) | |
1152 | flags &= ~(BTRFS_BLOCK_GROUP_RAID1 | BTRFS_BLOCK_GROUP_RAID0); | |
1153 | if (num_devices < 4) | |
1154 | flags &= ~BTRFS_BLOCK_GROUP_RAID10; | |
1155 | ||
ec44a35c CM |
1156 | if ((flags & BTRFS_BLOCK_GROUP_DUP) && |
1157 | (flags & (BTRFS_BLOCK_GROUP_RAID1 | | |
a061fc8d | 1158 | BTRFS_BLOCK_GROUP_RAID10))) { |
ec44a35c | 1159 | flags &= ~BTRFS_BLOCK_GROUP_DUP; |
a061fc8d | 1160 | } |
ec44a35c CM |
1161 | |
1162 | if ((flags & BTRFS_BLOCK_GROUP_RAID1) && | |
a061fc8d | 1163 | (flags & BTRFS_BLOCK_GROUP_RAID10)) { |
ec44a35c | 1164 | flags &= ~BTRFS_BLOCK_GROUP_RAID1; |
a061fc8d | 1165 | } |
ec44a35c CM |
1166 | |
1167 | if ((flags & BTRFS_BLOCK_GROUP_RAID0) && | |
1168 | ((flags & BTRFS_BLOCK_GROUP_RAID1) | | |
1169 | (flags & BTRFS_BLOCK_GROUP_RAID10) | | |
1170 | (flags & BTRFS_BLOCK_GROUP_DUP))) | |
1171 | flags &= ~BTRFS_BLOCK_GROUP_RAID0; | |
1172 | return flags; | |
1173 | } | |
1174 | ||
6324fbf3 CM |
1175 | static int do_chunk_alloc(struct btrfs_trans_handle *trans, |
1176 | struct btrfs_root *extent_root, u64 alloc_bytes, | |
0ef3e66b | 1177 | u64 flags, int force) |
6324fbf3 CM |
1178 | { |
1179 | struct btrfs_space_info *space_info; | |
1180 | u64 thresh; | |
1181 | u64 start; | |
1182 | u64 num_bytes; | |
1183 | int ret; | |
1184 | ||
a061fc8d | 1185 | flags = reduce_alloc_profile(extent_root, flags); |
ec44a35c | 1186 | |
6324fbf3 | 1187 | space_info = __find_space_info(extent_root->fs_info, flags); |
593060d7 CM |
1188 | if (!space_info) { |
1189 | ret = update_space_info(extent_root->fs_info, flags, | |
1190 | 0, 0, &space_info); | |
1191 | BUG_ON(ret); | |
1192 | } | |
6324fbf3 CM |
1193 | BUG_ON(!space_info); |
1194 | ||
0ef3e66b CM |
1195 | if (space_info->force_alloc) { |
1196 | force = 1; | |
1197 | space_info->force_alloc = 0; | |
1198 | } | |
6324fbf3 | 1199 | if (space_info->full) |
925baedd | 1200 | goto out; |
6324fbf3 | 1201 | |
8790d502 | 1202 | thresh = div_factor(space_info->total_bytes, 6); |
0ef3e66b CM |
1203 | if (!force && |
1204 | (space_info->bytes_used + space_info->bytes_pinned + alloc_bytes) < | |
6324fbf3 | 1205 | thresh) |
925baedd | 1206 | goto out; |
6324fbf3 | 1207 | |
925baedd | 1208 | mutex_lock(&extent_root->fs_info->chunk_mutex); |
6324fbf3 CM |
1209 | ret = btrfs_alloc_chunk(trans, extent_root, &start, &num_bytes, flags); |
1210 | if (ret == -ENOSPC) { | |
1211 | printk("space info full %Lu\n", flags); | |
1212 | space_info->full = 1; | |
925baedd | 1213 | goto out; |
6324fbf3 | 1214 | } |
6324fbf3 CM |
1215 | BUG_ON(ret); |
1216 | ||
1217 | ret = btrfs_make_block_group(trans, extent_root, 0, flags, | |
e17cade2 | 1218 | BTRFS_FIRST_CHUNK_TREE_OBJECTID, start, num_bytes); |
6324fbf3 | 1219 | BUG_ON(ret); |
925baedd CM |
1220 | mutex_unlock(&extent_root->fs_info->chunk_mutex); |
1221 | out: | |
6324fbf3 CM |
1222 | return 0; |
1223 | } | |
1224 | ||
9078a3e1 CM |
1225 | static int update_block_group(struct btrfs_trans_handle *trans, |
1226 | struct btrfs_root *root, | |
db94535d | 1227 | u64 bytenr, u64 num_bytes, int alloc, |
0b86a832 | 1228 | int mark_free) |
9078a3e1 CM |
1229 | { |
1230 | struct btrfs_block_group_cache *cache; | |
1231 | struct btrfs_fs_info *info = root->fs_info; | |
db94535d | 1232 | u64 total = num_bytes; |
9078a3e1 | 1233 | u64 old_val; |
db94535d | 1234 | u64 byte_in_group; |
96b5179d CM |
1235 | u64 start; |
1236 | u64 end; | |
3e1ad54f | 1237 | |
9078a3e1 | 1238 | while(total) { |
db94535d | 1239 | cache = btrfs_lookup_block_group(info, bytenr); |
3e1ad54f | 1240 | if (!cache) { |
9078a3e1 | 1241 | return -1; |
cd1bc465 | 1242 | } |
db94535d CM |
1243 | byte_in_group = bytenr - cache->key.objectid; |
1244 | WARN_ON(byte_in_group > cache->key.offset); | |
96b5179d CM |
1245 | start = cache->key.objectid; |
1246 | end = start + cache->key.offset - 1; | |
1247 | set_extent_bits(&info->block_group_cache, start, end, | |
1248 | BLOCK_GROUP_DIRTY, GFP_NOFS); | |
9078a3e1 CM |
1249 | |
1250 | old_val = btrfs_block_group_used(&cache->item); | |
db94535d | 1251 | num_bytes = min(total, cache->key.offset - byte_in_group); |
cd1bc465 | 1252 | if (alloc) { |
db94535d | 1253 | old_val += num_bytes; |
6324fbf3 | 1254 | cache->space_info->bytes_used += num_bytes; |
cd1bc465 | 1255 | } else { |
db94535d | 1256 | old_val -= num_bytes; |
6324fbf3 | 1257 | cache->space_info->bytes_used -= num_bytes; |
f510cfec CM |
1258 | if (mark_free) { |
1259 | set_extent_dirty(&info->free_space_cache, | |
db94535d | 1260 | bytenr, bytenr + num_bytes - 1, |
f510cfec | 1261 | GFP_NOFS); |
e37c9e69 | 1262 | } |
cd1bc465 | 1263 | } |
9078a3e1 | 1264 | btrfs_set_block_group_used(&cache->item, old_val); |
db94535d CM |
1265 | total -= num_bytes; |
1266 | bytenr += num_bytes; | |
9078a3e1 CM |
1267 | } |
1268 | return 0; | |
1269 | } | |
6324fbf3 | 1270 | |
a061fc8d CM |
1271 | static u64 first_logical_byte(struct btrfs_root *root, u64 search_start) |
1272 | { | |
1273 | u64 start; | |
1274 | u64 end; | |
1275 | int ret; | |
1276 | ret = find_first_extent_bit(&root->fs_info->block_group_cache, | |
1277 | search_start, &start, &end, | |
1278 | BLOCK_GROUP_DATA | BLOCK_GROUP_METADATA | | |
1279 | BLOCK_GROUP_SYSTEM); | |
1280 | if (ret) | |
1281 | return 0; | |
1282 | return start; | |
1283 | } | |
1284 | ||
1285 | ||
324ae4df Y |
1286 | static int update_pinned_extents(struct btrfs_root *root, |
1287 | u64 bytenr, u64 num, int pin) | |
1288 | { | |
1289 | u64 len; | |
1290 | struct btrfs_block_group_cache *cache; | |
1291 | struct btrfs_fs_info *fs_info = root->fs_info; | |
1292 | ||
1293 | if (pin) { | |
1294 | set_extent_dirty(&fs_info->pinned_extents, | |
1295 | bytenr, bytenr + num - 1, GFP_NOFS); | |
1296 | } else { | |
1297 | clear_extent_dirty(&fs_info->pinned_extents, | |
1298 | bytenr, bytenr + num - 1, GFP_NOFS); | |
1299 | } | |
1300 | while (num > 0) { | |
1301 | cache = btrfs_lookup_block_group(fs_info, bytenr); | |
a061fc8d CM |
1302 | if (!cache) { |
1303 | u64 first = first_logical_byte(root, bytenr); | |
1304 | WARN_ON(first < bytenr); | |
1305 | len = min(first - bytenr, num); | |
1306 | } else { | |
1307 | len = min(num, cache->key.offset - | |
1308 | (bytenr - cache->key.objectid)); | |
1309 | } | |
324ae4df | 1310 | if (pin) { |
a061fc8d CM |
1311 | if (cache) { |
1312 | cache->pinned += len; | |
1313 | cache->space_info->bytes_pinned += len; | |
1314 | } | |
324ae4df Y |
1315 | fs_info->total_pinned += len; |
1316 | } else { | |
a061fc8d CM |
1317 | if (cache) { |
1318 | cache->pinned -= len; | |
1319 | cache->space_info->bytes_pinned -= len; | |
1320 | } | |
324ae4df Y |
1321 | fs_info->total_pinned -= len; |
1322 | } | |
1323 | bytenr += len; | |
1324 | num -= len; | |
1325 | } | |
1326 | return 0; | |
1327 | } | |
9078a3e1 | 1328 | |
d1310b2e | 1329 | int btrfs_copy_pinned(struct btrfs_root *root, struct extent_io_tree *copy) |
ccd467d6 | 1330 | { |
ccd467d6 | 1331 | u64 last = 0; |
1a5bc167 CM |
1332 | u64 start; |
1333 | u64 end; | |
d1310b2e | 1334 | struct extent_io_tree *pinned_extents = &root->fs_info->pinned_extents; |
ccd467d6 | 1335 | int ret; |
ccd467d6 CM |
1336 | |
1337 | while(1) { | |
1a5bc167 CM |
1338 | ret = find_first_extent_bit(pinned_extents, last, |
1339 | &start, &end, EXTENT_DIRTY); | |
1340 | if (ret) | |
ccd467d6 | 1341 | break; |
1a5bc167 CM |
1342 | set_extent_dirty(copy, start, end, GFP_NOFS); |
1343 | last = end + 1; | |
ccd467d6 CM |
1344 | } |
1345 | return 0; | |
1346 | } | |
1347 | ||
1348 | int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans, | |
1349 | struct btrfs_root *root, | |
d1310b2e | 1350 | struct extent_io_tree *unpin) |
a28ec197 | 1351 | { |
1a5bc167 CM |
1352 | u64 start; |
1353 | u64 end; | |
a28ec197 | 1354 | int ret; |
d1310b2e | 1355 | struct extent_io_tree *free_space_cache; |
f510cfec | 1356 | free_space_cache = &root->fs_info->free_space_cache; |
a28ec197 | 1357 | |
925baedd | 1358 | mutex_lock(&root->fs_info->alloc_mutex); |
a28ec197 | 1359 | while(1) { |
1a5bc167 CM |
1360 | ret = find_first_extent_bit(unpin, 0, &start, &end, |
1361 | EXTENT_DIRTY); | |
1362 | if (ret) | |
a28ec197 | 1363 | break; |
324ae4df | 1364 | update_pinned_extents(root, start, end + 1 - start, 0); |
1a5bc167 CM |
1365 | clear_extent_dirty(unpin, start, end, GFP_NOFS); |
1366 | set_extent_dirty(free_space_cache, start, end, GFP_NOFS); | |
a28ec197 | 1367 | } |
925baedd | 1368 | mutex_unlock(&root->fs_info->alloc_mutex); |
a28ec197 CM |
1369 | return 0; |
1370 | } | |
1371 | ||
98ed5174 CM |
1372 | static int finish_current_insert(struct btrfs_trans_handle *trans, |
1373 | struct btrfs_root *extent_root) | |
037e6390 | 1374 | { |
7bb86316 CM |
1375 | u64 start; |
1376 | u64 end; | |
1377 | struct btrfs_fs_info *info = extent_root->fs_info; | |
d8d5f3e1 | 1378 | struct extent_buffer *eb; |
7bb86316 | 1379 | struct btrfs_path *path; |
e2fa7227 | 1380 | struct btrfs_key ins; |
d8d5f3e1 | 1381 | struct btrfs_disk_key first; |
234b63a0 | 1382 | struct btrfs_extent_item extent_item; |
037e6390 | 1383 | int ret; |
d8d5f3e1 | 1384 | int level; |
1a5bc167 | 1385 | int err = 0; |
037e6390 | 1386 | |
5f39d397 | 1387 | btrfs_set_stack_extent_refs(&extent_item, 1); |
62e2749e | 1388 | btrfs_set_key_type(&ins, BTRFS_EXTENT_ITEM_KEY); |
7bb86316 | 1389 | path = btrfs_alloc_path(); |
037e6390 | 1390 | |
26b8003f | 1391 | while(1) { |
1a5bc167 CM |
1392 | ret = find_first_extent_bit(&info->extent_ins, 0, &start, |
1393 | &end, EXTENT_LOCKED); | |
1394 | if (ret) | |
26b8003f CM |
1395 | break; |
1396 | ||
1a5bc167 CM |
1397 | ins.objectid = start; |
1398 | ins.offset = end + 1 - start; | |
1399 | err = btrfs_insert_item(trans, extent_root, &ins, | |
1400 | &extent_item, sizeof(extent_item)); | |
1401 | clear_extent_bits(&info->extent_ins, start, end, EXTENT_LOCKED, | |
1402 | GFP_NOFS); | |
ca7a79ad CM |
1403 | eb = read_tree_block(extent_root, ins.objectid, ins.offset, |
1404 | trans->transid); | |
925baedd | 1405 | btrfs_tree_lock(eb); |
d8d5f3e1 CM |
1406 | level = btrfs_header_level(eb); |
1407 | if (level == 0) { | |
1408 | btrfs_item_key(eb, &first, 0); | |
1409 | } else { | |
1410 | btrfs_node_key(eb, &first, 0); | |
1411 | } | |
925baedd CM |
1412 | btrfs_tree_unlock(eb); |
1413 | free_extent_buffer(eb); | |
1414 | /* | |
1415 | * the first key is just a hint, so the race we've created | |
1416 | * against reading it is fine | |
1417 | */ | |
7bb86316 CM |
1418 | err = btrfs_insert_extent_backref(trans, extent_root, path, |
1419 | start, extent_root->root_key.objectid, | |
f6dbff55 CM |
1420 | 0, level, |
1421 | btrfs_disk_key_objectid(&first)); | |
7bb86316 | 1422 | BUG_ON(err); |
037e6390 | 1423 | } |
7bb86316 | 1424 | btrfs_free_path(path); |
037e6390 CM |
1425 | return 0; |
1426 | } | |
1427 | ||
db94535d CM |
1428 | static int pin_down_bytes(struct btrfs_root *root, u64 bytenr, u32 num_bytes, |
1429 | int pending) | |
e20d96d6 | 1430 | { |
1a5bc167 | 1431 | int err = 0; |
8ef97622 | 1432 | |
f4b9aa8d | 1433 | if (!pending) { |
925baedd CM |
1434 | #if 0 |
1435 | struct extent_buffer *buf; | |
db94535d | 1436 | buf = btrfs_find_tree_block(root, bytenr, num_bytes); |
5f39d397 | 1437 | if (buf) { |
925baedd CM |
1438 | if (!btrfs_try_tree_lock(buf) && |
1439 | btrfs_buffer_uptodate(buf, 0)) { | |
2c90e5d6 CM |
1440 | u64 transid = |
1441 | root->fs_info->running_transaction->transid; | |
dc17ff8f CM |
1442 | u64 header_transid = |
1443 | btrfs_header_generation(buf); | |
6bc34676 CM |
1444 | if (header_transid == transid && |
1445 | !btrfs_header_flag(buf, | |
1446 | BTRFS_HEADER_FLAG_WRITTEN)) { | |
55c69072 | 1447 | clean_tree_block(NULL, root, buf); |
925baedd | 1448 | btrfs_tree_unlock(buf); |
5f39d397 | 1449 | free_extent_buffer(buf); |
c549228f | 1450 | return 1; |
2c90e5d6 | 1451 | } |
925baedd | 1452 | btrfs_tree_unlock(buf); |
f4b9aa8d | 1453 | } |
5f39d397 | 1454 | free_extent_buffer(buf); |
8ef97622 | 1455 | } |
925baedd | 1456 | #endif |
324ae4df | 1457 | update_pinned_extents(root, bytenr, num_bytes, 1); |
f4b9aa8d | 1458 | } else { |
1a5bc167 | 1459 | set_extent_bits(&root->fs_info->pending_del, |
db94535d CM |
1460 | bytenr, bytenr + num_bytes - 1, |
1461 | EXTENT_LOCKED, GFP_NOFS); | |
f4b9aa8d | 1462 | } |
be744175 | 1463 | BUG_ON(err < 0); |
e20d96d6 CM |
1464 | return 0; |
1465 | } | |
1466 | ||
fec577fb | 1467 | /* |
a28ec197 | 1468 | * remove an extent from the root, returns 0 on success |
fec577fb | 1469 | */ |
e089f05c | 1470 | static int __free_extent(struct btrfs_trans_handle *trans, struct btrfs_root |
7bb86316 CM |
1471 | *root, u64 bytenr, u64 num_bytes, |
1472 | u64 root_objectid, u64 ref_generation, | |
1473 | u64 owner_objectid, u64 owner_offset, int pin, | |
e37c9e69 | 1474 | int mark_free) |
a28ec197 | 1475 | { |
5caf2a00 | 1476 | struct btrfs_path *path; |
e2fa7227 | 1477 | struct btrfs_key key; |
1261ec42 CM |
1478 | struct btrfs_fs_info *info = root->fs_info; |
1479 | struct btrfs_root *extent_root = info->extent_root; | |
5f39d397 | 1480 | struct extent_buffer *leaf; |
a28ec197 | 1481 | int ret; |
952fccac CM |
1482 | int extent_slot = 0; |
1483 | int found_extent = 0; | |
1484 | int num_to_del = 1; | |
234b63a0 | 1485 | struct btrfs_extent_item *ei; |
cf27e1ee | 1486 | u32 refs; |
037e6390 | 1487 | |
db94535d | 1488 | key.objectid = bytenr; |
62e2749e | 1489 | btrfs_set_key_type(&key, BTRFS_EXTENT_ITEM_KEY); |
db94535d | 1490 | key.offset = num_bytes; |
5caf2a00 | 1491 | path = btrfs_alloc_path(); |
54aa1f4d CM |
1492 | if (!path) |
1493 | return -ENOMEM; | |
5f26f772 | 1494 | |
3c12ac72 | 1495 | path->reada = 1; |
7bb86316 CM |
1496 | ret = lookup_extent_backref(trans, extent_root, path, |
1497 | bytenr, root_objectid, | |
1498 | ref_generation, | |
1499 | owner_objectid, owner_offset, 1); | |
1500 | if (ret == 0) { | |
952fccac CM |
1501 | struct btrfs_key found_key; |
1502 | extent_slot = path->slots[0]; | |
1503 | while(extent_slot > 0) { | |
1504 | extent_slot--; | |
1505 | btrfs_item_key_to_cpu(path->nodes[0], &found_key, | |
1506 | extent_slot); | |
1507 | if (found_key.objectid != bytenr) | |
1508 | break; | |
1509 | if (found_key.type == BTRFS_EXTENT_ITEM_KEY && | |
1510 | found_key.offset == num_bytes) { | |
1511 | found_extent = 1; | |
1512 | break; | |
1513 | } | |
1514 | if (path->slots[0] - extent_slot > 5) | |
1515 | break; | |
1516 | } | |
1517 | if (!found_extent) | |
1518 | ret = btrfs_del_item(trans, extent_root, path); | |
7bb86316 CM |
1519 | } else { |
1520 | btrfs_print_leaf(extent_root, path->nodes[0]); | |
1521 | WARN_ON(1); | |
1522 | printk("Unable to find ref byte nr %Lu root %Lu " | |
1523 | " gen %Lu owner %Lu offset %Lu\n", bytenr, | |
1524 | root_objectid, ref_generation, owner_objectid, | |
1525 | owner_offset); | |
1526 | } | |
952fccac CM |
1527 | if (!found_extent) { |
1528 | btrfs_release_path(extent_root, path); | |
1529 | ret = btrfs_search_slot(trans, extent_root, &key, path, -1, 1); | |
1530 | if (ret < 0) | |
1531 | return ret; | |
1532 | BUG_ON(ret); | |
1533 | extent_slot = path->slots[0]; | |
1534 | } | |
5f39d397 CM |
1535 | |
1536 | leaf = path->nodes[0]; | |
952fccac | 1537 | ei = btrfs_item_ptr(leaf, extent_slot, |
123abc88 | 1538 | struct btrfs_extent_item); |
5f39d397 CM |
1539 | refs = btrfs_extent_refs(leaf, ei); |
1540 | BUG_ON(refs == 0); | |
1541 | refs -= 1; | |
1542 | btrfs_set_extent_refs(leaf, ei, refs); | |
952fccac | 1543 | |
5f39d397 CM |
1544 | btrfs_mark_buffer_dirty(leaf); |
1545 | ||
952fccac CM |
1546 | if (refs == 0 && found_extent && path->slots[0] == extent_slot + 1) { |
1547 | /* if the back ref and the extent are next to each other | |
1548 | * they get deleted below in one shot | |
1549 | */ | |
1550 | path->slots[0] = extent_slot; | |
1551 | num_to_del = 2; | |
1552 | } else if (found_extent) { | |
1553 | /* otherwise delete the extent back ref */ | |
1554 | ret = btrfs_del_item(trans, extent_root, path); | |
1555 | BUG_ON(ret); | |
1556 | /* if refs are 0, we need to setup the path for deletion */ | |
1557 | if (refs == 0) { | |
1558 | btrfs_release_path(extent_root, path); | |
1559 | ret = btrfs_search_slot(trans, extent_root, &key, path, | |
1560 | -1, 1); | |
1561 | if (ret < 0) | |
1562 | return ret; | |
1563 | BUG_ON(ret); | |
1564 | } | |
1565 | } | |
1566 | ||
cf27e1ee | 1567 | if (refs == 0) { |
db94535d CM |
1568 | u64 super_used; |
1569 | u64 root_used; | |
78fae27e CM |
1570 | |
1571 | if (pin) { | |
db94535d | 1572 | ret = pin_down_bytes(root, bytenr, num_bytes, 0); |
c549228f Y |
1573 | if (ret > 0) |
1574 | mark_free = 1; | |
1575 | BUG_ON(ret < 0); | |
78fae27e CM |
1576 | } |
1577 | ||
58176a96 | 1578 | /* block accounting for super block */ |
a2135011 | 1579 | spin_lock_irq(&info->delalloc_lock); |
db94535d CM |
1580 | super_used = btrfs_super_bytes_used(&info->super_copy); |
1581 | btrfs_set_super_bytes_used(&info->super_copy, | |
1582 | super_used - num_bytes); | |
a2135011 | 1583 | spin_unlock_irq(&info->delalloc_lock); |
58176a96 JB |
1584 | |
1585 | /* block accounting for root item */ | |
db94535d | 1586 | root_used = btrfs_root_used(&root->root_item); |
5f39d397 | 1587 | btrfs_set_root_used(&root->root_item, |
db94535d | 1588 | root_used - num_bytes); |
952fccac CM |
1589 | ret = btrfs_del_items(trans, extent_root, path, path->slots[0], |
1590 | num_to_del); | |
54aa1f4d CM |
1591 | if (ret) { |
1592 | return ret; | |
1593 | } | |
db94535d | 1594 | ret = update_block_group(trans, root, bytenr, num_bytes, 0, |
0b86a832 | 1595 | mark_free); |
9078a3e1 | 1596 | BUG_ON(ret); |
a28ec197 | 1597 | } |
5caf2a00 | 1598 | btrfs_free_path(path); |
e089f05c | 1599 | finish_current_insert(trans, extent_root); |
a28ec197 CM |
1600 | return ret; |
1601 | } | |
1602 | ||
a28ec197 CM |
1603 | /* |
1604 | * find all the blocks marked as pending in the radix tree and remove | |
1605 | * them from the extent map | |
1606 | */ | |
e089f05c CM |
1607 | static int del_pending_extents(struct btrfs_trans_handle *trans, struct |
1608 | btrfs_root *extent_root) | |
a28ec197 CM |
1609 | { |
1610 | int ret; | |
e20d96d6 | 1611 | int err = 0; |
1a5bc167 CM |
1612 | u64 start; |
1613 | u64 end; | |
d1310b2e CM |
1614 | struct extent_io_tree *pending_del; |
1615 | struct extent_io_tree *pinned_extents; | |
8ef97622 | 1616 | |
1a5bc167 CM |
1617 | pending_del = &extent_root->fs_info->pending_del; |
1618 | pinned_extents = &extent_root->fs_info->pinned_extents; | |
a28ec197 CM |
1619 | |
1620 | while(1) { | |
1a5bc167 CM |
1621 | ret = find_first_extent_bit(pending_del, 0, &start, &end, |
1622 | EXTENT_LOCKED); | |
1623 | if (ret) | |
a28ec197 | 1624 | break; |
324ae4df | 1625 | update_pinned_extents(extent_root, start, end + 1 - start, 1); |
1a5bc167 CM |
1626 | clear_extent_bits(pending_del, start, end, EXTENT_LOCKED, |
1627 | GFP_NOFS); | |
1628 | ret = __free_extent(trans, extent_root, | |
7bb86316 CM |
1629 | start, end + 1 - start, |
1630 | extent_root->root_key.objectid, | |
1631 | 0, 0, 0, 0, 0); | |
1a5bc167 CM |
1632 | if (ret) |
1633 | err = ret; | |
fec577fb | 1634 | } |
e20d96d6 | 1635 | return err; |
fec577fb CM |
1636 | } |
1637 | ||
1638 | /* | |
1639 | * remove an extent from the root, returns 0 on success | |
1640 | */ | |
925baedd CM |
1641 | static int __btrfs_free_extent(struct btrfs_trans_handle *trans, |
1642 | struct btrfs_root *root, u64 bytenr, | |
1643 | u64 num_bytes, u64 root_objectid, | |
1644 | u64 ref_generation, u64 owner_objectid, | |
1645 | u64 owner_offset, int pin) | |
fec577fb | 1646 | { |
9f5fae2f | 1647 | struct btrfs_root *extent_root = root->fs_info->extent_root; |
fec577fb CM |
1648 | int pending_ret; |
1649 | int ret; | |
a28ec197 | 1650 | |
db94535d | 1651 | WARN_ON(num_bytes < root->sectorsize); |
7bb86316 CM |
1652 | if (!root->ref_cows) |
1653 | ref_generation = 0; | |
1654 | ||
fec577fb | 1655 | if (root == extent_root) { |
db94535d | 1656 | pin_down_bytes(root, bytenr, num_bytes, 1); |
fec577fb CM |
1657 | return 0; |
1658 | } | |
7bb86316 CM |
1659 | ret = __free_extent(trans, root, bytenr, num_bytes, root_objectid, |
1660 | ref_generation, owner_objectid, owner_offset, | |
1661 | pin, pin == 0); | |
e20d96d6 | 1662 | pending_ret = del_pending_extents(trans, root->fs_info->extent_root); |
fec577fb CM |
1663 | return ret ? ret : pending_ret; |
1664 | } | |
1665 | ||
925baedd CM |
1666 | int btrfs_free_extent(struct btrfs_trans_handle *trans, |
1667 | struct btrfs_root *root, u64 bytenr, | |
1668 | u64 num_bytes, u64 root_objectid, | |
1669 | u64 ref_generation, u64 owner_objectid, | |
1670 | u64 owner_offset, int pin) | |
1671 | { | |
1672 | int ret; | |
1673 | ||
1674 | maybe_lock_mutex(root); | |
1675 | ret = __btrfs_free_extent(trans, root, bytenr, num_bytes, | |
1676 | root_objectid, ref_generation, | |
1677 | owner_objectid, owner_offset, pin); | |
1678 | maybe_unlock_mutex(root); | |
1679 | return ret; | |
1680 | } | |
1681 | ||
87ee04eb CM |
1682 | static u64 stripe_align(struct btrfs_root *root, u64 val) |
1683 | { | |
1684 | u64 mask = ((u64)root->stripesize - 1); | |
1685 | u64 ret = (val + mask) & ~mask; | |
1686 | return ret; | |
1687 | } | |
1688 | ||
fec577fb CM |
1689 | /* |
1690 | * walks the btree of allocated extents and find a hole of a given size. | |
1691 | * The key ins is changed to record the hole: | |
1692 | * ins->objectid == block start | |
62e2749e | 1693 | * ins->flags = BTRFS_EXTENT_ITEM_KEY |
fec577fb CM |
1694 | * ins->offset == number of blocks |
1695 | * Any available blocks before search_start are skipped. | |
1696 | */ | |
98ed5174 CM |
1697 | static int noinline find_free_extent(struct btrfs_trans_handle *trans, |
1698 | struct btrfs_root *orig_root, | |
1699 | u64 num_bytes, u64 empty_size, | |
1700 | u64 search_start, u64 search_end, | |
1701 | u64 hint_byte, struct btrfs_key *ins, | |
1702 | u64 exclude_start, u64 exclude_nr, | |
1703 | int data) | |
fec577fb | 1704 | { |
87ee04eb | 1705 | int ret; |
a061fc8d | 1706 | u64 orig_search_start; |
9f5fae2f | 1707 | struct btrfs_root * root = orig_root->fs_info->extent_root; |
f2458e1d | 1708 | struct btrfs_fs_info *info = root->fs_info; |
db94535d | 1709 | u64 total_needed = num_bytes; |
239b14b3 | 1710 | u64 *last_ptr = NULL; |
be08c1b9 | 1711 | struct btrfs_block_group_cache *block_group; |
be744175 | 1712 | int full_scan = 0; |
fbdc762b | 1713 | int wrapped = 0; |
0ef3e66b | 1714 | int chunk_alloc_done = 0; |
239b14b3 | 1715 | int empty_cluster = 2 * 1024 * 1024; |
0ef3e66b | 1716 | int allowed_chunk_alloc = 0; |
fec577fb | 1717 | |
db94535d | 1718 | WARN_ON(num_bytes < root->sectorsize); |
b1a4d965 CM |
1719 | btrfs_set_key_type(ins, BTRFS_EXTENT_ITEM_KEY); |
1720 | ||
0ef3e66b CM |
1721 | if (orig_root->ref_cows || empty_size) |
1722 | allowed_chunk_alloc = 1; | |
1723 | ||
239b14b3 CM |
1724 | if (data & BTRFS_BLOCK_GROUP_METADATA) { |
1725 | last_ptr = &root->fs_info->last_alloc; | |
8790d502 | 1726 | empty_cluster = 256 * 1024; |
239b14b3 CM |
1727 | } |
1728 | ||
1729 | if ((data & BTRFS_BLOCK_GROUP_DATA) && btrfs_test_opt(root, SSD)) { | |
1730 | last_ptr = &root->fs_info->last_data_alloc; | |
1731 | } | |
1732 | ||
1733 | if (last_ptr) { | |
1734 | if (*last_ptr) | |
1735 | hint_byte = *last_ptr; | |
1736 | else { | |
1737 | empty_size += empty_cluster; | |
1738 | } | |
1739 | } | |
1740 | ||
a061fc8d CM |
1741 | search_start = max(search_start, first_logical_byte(root, 0)); |
1742 | orig_search_start = search_start; | |
1743 | ||
7f93bf8d CM |
1744 | if (search_end == (u64)-1) |
1745 | search_end = btrfs_super_total_bytes(&info->super_copy); | |
0b86a832 | 1746 | |
db94535d | 1747 | if (hint_byte) { |
0ef3e66b | 1748 | block_group = btrfs_lookup_first_block_group(info, hint_byte); |
1a2b2ac7 CM |
1749 | if (!block_group) |
1750 | hint_byte = search_start; | |
925baedd | 1751 | block_group = __btrfs_find_block_group(root, block_group, |
db94535d | 1752 | hint_byte, data, 1); |
239b14b3 CM |
1753 | if (last_ptr && *last_ptr == 0 && block_group) |
1754 | hint_byte = block_group->key.objectid; | |
be744175 | 1755 | } else { |
925baedd | 1756 | block_group = __btrfs_find_block_group(root, |
1a2b2ac7 CM |
1757 | trans->block_group, |
1758 | search_start, data, 1); | |
be744175 | 1759 | } |
239b14b3 | 1760 | search_start = max(search_start, hint_byte); |
be744175 | 1761 | |
6702ed49 | 1762 | total_needed += empty_size; |
0b86a832 | 1763 | |
be744175 | 1764 | check_failed: |
70b043f0 | 1765 | if (!block_group) { |
0ef3e66b CM |
1766 | block_group = btrfs_lookup_first_block_group(info, |
1767 | search_start); | |
70b043f0 | 1768 | if (!block_group) |
0ef3e66b | 1769 | block_group = btrfs_lookup_first_block_group(info, |
70b043f0 CM |
1770 | orig_search_start); |
1771 | } | |
0ef3e66b CM |
1772 | if (full_scan && !chunk_alloc_done) { |
1773 | if (allowed_chunk_alloc) { | |
1774 | do_chunk_alloc(trans, root, | |
1775 | num_bytes + 2 * 1024 * 1024, data, 1); | |
1776 | allowed_chunk_alloc = 0; | |
1777 | } else if (block_group && block_group_bits(block_group, data)) { | |
1778 | block_group->space_info->force_alloc = 1; | |
1779 | } | |
1780 | chunk_alloc_done = 1; | |
1781 | } | |
0b86a832 CM |
1782 | ret = find_search_start(root, &block_group, &search_start, |
1783 | total_needed, data); | |
239b14b3 CM |
1784 | if (ret == -ENOSPC && last_ptr && *last_ptr) { |
1785 | *last_ptr = 0; | |
0ef3e66b CM |
1786 | block_group = btrfs_lookup_first_block_group(info, |
1787 | orig_search_start); | |
239b14b3 CM |
1788 | search_start = orig_search_start; |
1789 | ret = find_search_start(root, &block_group, &search_start, | |
1790 | total_needed, data); | |
1791 | } | |
1792 | if (ret == -ENOSPC) | |
1793 | goto enospc; | |
0b86a832 | 1794 | if (ret) |
d548ee51 | 1795 | goto error; |
e19caa5f | 1796 | |
239b14b3 CM |
1797 | if (last_ptr && *last_ptr && search_start != *last_ptr) { |
1798 | *last_ptr = 0; | |
1799 | if (!empty_size) { | |
1800 | empty_size += empty_cluster; | |
1801 | total_needed += empty_size; | |
1802 | } | |
0ef3e66b | 1803 | block_group = btrfs_lookup_first_block_group(info, |
239b14b3 CM |
1804 | orig_search_start); |
1805 | search_start = orig_search_start; | |
1806 | ret = find_search_start(root, &block_group, | |
1807 | &search_start, total_needed, data); | |
1808 | if (ret == -ENOSPC) | |
1809 | goto enospc; | |
1810 | if (ret) | |
1811 | goto error; | |
1812 | } | |
1813 | ||
0b86a832 CM |
1814 | search_start = stripe_align(root, search_start); |
1815 | ins->objectid = search_start; | |
1816 | ins->offset = num_bytes; | |
e37c9e69 | 1817 | |
db94535d | 1818 | if (ins->objectid + num_bytes >= search_end) |
cf67582b | 1819 | goto enospc; |
0b86a832 CM |
1820 | |
1821 | if (ins->objectid + num_bytes > | |
1822 | block_group->key.objectid + block_group->key.offset) { | |
e19caa5f CM |
1823 | search_start = block_group->key.objectid + |
1824 | block_group->key.offset; | |
1825 | goto new_group; | |
1826 | } | |
0b86a832 | 1827 | |
1a5bc167 | 1828 | if (test_range_bit(&info->extent_ins, ins->objectid, |
db94535d CM |
1829 | ins->objectid + num_bytes -1, EXTENT_LOCKED, 0)) { |
1830 | search_start = ins->objectid + num_bytes; | |
1a5bc167 CM |
1831 | goto new_group; |
1832 | } | |
0b86a832 | 1833 | |
1a5bc167 | 1834 | if (test_range_bit(&info->pinned_extents, ins->objectid, |
db94535d CM |
1835 | ins->objectid + num_bytes -1, EXTENT_DIRTY, 0)) { |
1836 | search_start = ins->objectid + num_bytes; | |
1a5bc167 | 1837 | goto new_group; |
fec577fb | 1838 | } |
0b86a832 | 1839 | |
db94535d | 1840 | if (exclude_nr > 0 && (ins->objectid + num_bytes > exclude_start && |
f2654de4 CM |
1841 | ins->objectid < exclude_start + exclude_nr)) { |
1842 | search_start = exclude_start + exclude_nr; | |
1843 | goto new_group; | |
1844 | } | |
0b86a832 | 1845 | |
6324fbf3 | 1846 | if (!(data & BTRFS_BLOCK_GROUP_DATA)) { |
5276aeda | 1847 | block_group = btrfs_lookup_block_group(info, ins->objectid); |
26b8003f CM |
1848 | if (block_group) |
1849 | trans->block_group = block_group; | |
f2458e1d | 1850 | } |
db94535d | 1851 | ins->offset = num_bytes; |
239b14b3 CM |
1852 | if (last_ptr) { |
1853 | *last_ptr = ins->objectid + ins->offset; | |
1854 | if (*last_ptr == | |
1855 | btrfs_super_total_bytes(&root->fs_info->super_copy)) { | |
1856 | *last_ptr = 0; | |
1857 | } | |
1858 | } | |
fec577fb | 1859 | return 0; |
be744175 CM |
1860 | |
1861 | new_group: | |
db94535d | 1862 | if (search_start + num_bytes >= search_end) { |
cf67582b | 1863 | enospc: |
be744175 | 1864 | search_start = orig_search_start; |
fbdc762b CM |
1865 | if (full_scan) { |
1866 | ret = -ENOSPC; | |
1867 | goto error; | |
1868 | } | |
6702ed49 CM |
1869 | if (wrapped) { |
1870 | if (!full_scan) | |
1871 | total_needed -= empty_size; | |
fbdc762b | 1872 | full_scan = 1; |
6702ed49 | 1873 | } else |
fbdc762b | 1874 | wrapped = 1; |
be744175 | 1875 | } |
0ef3e66b | 1876 | block_group = btrfs_lookup_first_block_group(info, search_start); |
fbdc762b | 1877 | cond_resched(); |
925baedd | 1878 | block_group = __btrfs_find_block_group(root, block_group, |
1a2b2ac7 | 1879 | search_start, data, 0); |
be744175 CM |
1880 | goto check_failed; |
1881 | ||
0f70abe2 | 1882 | error: |
0f70abe2 | 1883 | return ret; |
fec577fb | 1884 | } |
ec44a35c | 1885 | |
fec577fb CM |
1886 | /* |
1887 | * finds a free extent and does all the dirty work required for allocation | |
1888 | * returns the key for the extent through ins, and a tree buffer for | |
1889 | * the first block of the extent through buf. | |
1890 | * | |
1891 | * returns 0 if everything worked, non-zero otherwise. | |
1892 | */ | |
4d775673 | 1893 | int btrfs_alloc_extent(struct btrfs_trans_handle *trans, |
7bb86316 | 1894 | struct btrfs_root *root, |
98d20f67 CM |
1895 | u64 num_bytes, u64 min_alloc_size, |
1896 | u64 root_objectid, u64 ref_generation, | |
7bb86316 CM |
1897 | u64 owner, u64 owner_offset, |
1898 | u64 empty_size, u64 hint_byte, | |
ec44a35c | 1899 | u64 search_end, struct btrfs_key *ins, u64 data) |
fec577fb CM |
1900 | { |
1901 | int ret; | |
1902 | int pending_ret; | |
c31f8830 CM |
1903 | u64 super_used; |
1904 | u64 root_used; | |
fbdc762b | 1905 | u64 search_start = 0; |
8790d502 | 1906 | u64 alloc_profile; |
47e4bb98 | 1907 | u32 sizes[2]; |
1261ec42 CM |
1908 | struct btrfs_fs_info *info = root->fs_info; |
1909 | struct btrfs_root *extent_root = info->extent_root; | |
47e4bb98 CM |
1910 | struct btrfs_extent_item *extent_item; |
1911 | struct btrfs_extent_ref *ref; | |
7bb86316 | 1912 | struct btrfs_path *path; |
47e4bb98 | 1913 | struct btrfs_key keys[2]; |
8f662a76 | 1914 | |
925baedd CM |
1915 | maybe_lock_mutex(root); |
1916 | ||
6324fbf3 | 1917 | if (data) { |
8790d502 CM |
1918 | alloc_profile = info->avail_data_alloc_bits & |
1919 | info->data_alloc_profile; | |
1920 | data = BTRFS_BLOCK_GROUP_DATA | alloc_profile; | |
6324fbf3 | 1921 | } else if (root == root->fs_info->chunk_root) { |
8790d502 CM |
1922 | alloc_profile = info->avail_system_alloc_bits & |
1923 | info->system_alloc_profile; | |
1924 | data = BTRFS_BLOCK_GROUP_SYSTEM | alloc_profile; | |
6324fbf3 | 1925 | } else { |
8790d502 CM |
1926 | alloc_profile = info->avail_metadata_alloc_bits & |
1927 | info->metadata_alloc_profile; | |
1928 | data = BTRFS_BLOCK_GROUP_METADATA | alloc_profile; | |
6324fbf3 | 1929 | } |
98d20f67 | 1930 | again: |
a061fc8d | 1931 | data = reduce_alloc_profile(root, data); |
0ef3e66b CM |
1932 | /* |
1933 | * the only place that sets empty_size is btrfs_realloc_node, which | |
1934 | * is not called recursively on allocations | |
1935 | */ | |
1936 | if (empty_size || root->ref_cows) { | |
593060d7 | 1937 | if (!(data & BTRFS_BLOCK_GROUP_METADATA)) { |
6324fbf3 | 1938 | ret = do_chunk_alloc(trans, root->fs_info->extent_root, |
0ef3e66b CM |
1939 | 2 * 1024 * 1024, |
1940 | BTRFS_BLOCK_GROUP_METADATA | | |
1941 | (info->metadata_alloc_profile & | |
1942 | info->avail_metadata_alloc_bits), 0); | |
6324fbf3 CM |
1943 | BUG_ON(ret); |
1944 | } | |
1945 | ret = do_chunk_alloc(trans, root->fs_info->extent_root, | |
0ef3e66b | 1946 | num_bytes + 2 * 1024 * 1024, data, 0); |
6324fbf3 CM |
1947 | BUG_ON(ret); |
1948 | } | |
0b86a832 | 1949 | |
db94535d CM |
1950 | WARN_ON(num_bytes < root->sectorsize); |
1951 | ret = find_free_extent(trans, root, num_bytes, empty_size, | |
1952 | search_start, search_end, hint_byte, ins, | |
26b8003f CM |
1953 | trans->alloc_exclude_start, |
1954 | trans->alloc_exclude_nr, data); | |
3b951516 | 1955 | |
98d20f67 CM |
1956 | if (ret == -ENOSPC && num_bytes > min_alloc_size) { |
1957 | num_bytes = num_bytes >> 1; | |
1958 | num_bytes = max(num_bytes, min_alloc_size); | |
0ef3e66b CM |
1959 | do_chunk_alloc(trans, root->fs_info->extent_root, |
1960 | num_bytes, data, 1); | |
98d20f67 CM |
1961 | goto again; |
1962 | } | |
ec44a35c CM |
1963 | if (ret) { |
1964 | printk("allocation failed flags %Lu\n", data); | |
1965 | } | |
925baedd CM |
1966 | if (ret) { |
1967 | BUG(); | |
1968 | goto out; | |
1969 | } | |
fec577fb | 1970 | |
58176a96 | 1971 | /* block accounting for super block */ |
a2135011 | 1972 | spin_lock_irq(&info->delalloc_lock); |
db94535d CM |
1973 | super_used = btrfs_super_bytes_used(&info->super_copy); |
1974 | btrfs_set_super_bytes_used(&info->super_copy, super_used + num_bytes); | |
a2135011 | 1975 | spin_unlock_irq(&info->delalloc_lock); |
26b8003f | 1976 | |
58176a96 | 1977 | /* block accounting for root item */ |
db94535d CM |
1978 | root_used = btrfs_root_used(&root->root_item); |
1979 | btrfs_set_root_used(&root->root_item, root_used + num_bytes); | |
58176a96 | 1980 | |
f510cfec CM |
1981 | clear_extent_dirty(&root->fs_info->free_space_cache, |
1982 | ins->objectid, ins->objectid + ins->offset - 1, | |
1983 | GFP_NOFS); | |
1984 | ||
26b8003f | 1985 | if (root == extent_root) { |
1a5bc167 CM |
1986 | set_extent_bits(&root->fs_info->extent_ins, ins->objectid, |
1987 | ins->objectid + ins->offset - 1, | |
1988 | EXTENT_LOCKED, GFP_NOFS); | |
26b8003f CM |
1989 | goto update_block; |
1990 | } | |
1991 | ||
1992 | WARN_ON(trans->alloc_exclude_nr); | |
1993 | trans->alloc_exclude_start = ins->objectid; | |
1994 | trans->alloc_exclude_nr = ins->offset; | |
037e6390 | 1995 | |
47e4bb98 CM |
1996 | memcpy(&keys[0], ins, sizeof(*ins)); |
1997 | keys[1].offset = hash_extent_ref(root_objectid, ref_generation, | |
1998 | owner, owner_offset); | |
1999 | keys[1].objectid = ins->objectid; | |
2000 | keys[1].type = BTRFS_EXTENT_REF_KEY; | |
2001 | sizes[0] = sizeof(*extent_item); | |
2002 | sizes[1] = sizeof(*ref); | |
7bb86316 CM |
2003 | |
2004 | path = btrfs_alloc_path(); | |
2005 | BUG_ON(!path); | |
47e4bb98 CM |
2006 | |
2007 | ret = btrfs_insert_empty_items(trans, extent_root, path, keys, | |
2008 | sizes, 2); | |
26b8003f | 2009 | |
ccd467d6 | 2010 | BUG_ON(ret); |
47e4bb98 CM |
2011 | extent_item = btrfs_item_ptr(path->nodes[0], path->slots[0], |
2012 | struct btrfs_extent_item); | |
2013 | btrfs_set_extent_refs(path->nodes[0], extent_item, 1); | |
2014 | ref = btrfs_item_ptr(path->nodes[0], path->slots[0] + 1, | |
2015 | struct btrfs_extent_ref); | |
2016 | ||
2017 | btrfs_set_ref_root(path->nodes[0], ref, root_objectid); | |
2018 | btrfs_set_ref_generation(path->nodes[0], ref, ref_generation); | |
2019 | btrfs_set_ref_objectid(path->nodes[0], ref, owner); | |
2020 | btrfs_set_ref_offset(path->nodes[0], ref, owner_offset); | |
2021 | ||
2022 | btrfs_mark_buffer_dirty(path->nodes[0]); | |
2023 | ||
2024 | trans->alloc_exclude_start = 0; | |
2025 | trans->alloc_exclude_nr = 0; | |
7bb86316 | 2026 | btrfs_free_path(path); |
e089f05c | 2027 | finish_current_insert(trans, extent_root); |
e20d96d6 | 2028 | pending_ret = del_pending_extents(trans, extent_root); |
f510cfec | 2029 | |
925baedd CM |
2030 | if (ret) |
2031 | goto out; | |
e37c9e69 | 2032 | if (pending_ret) { |
925baedd CM |
2033 | ret = pending_ret; |
2034 | goto out; | |
e37c9e69 | 2035 | } |
26b8003f CM |
2036 | |
2037 | update_block: | |
0b86a832 | 2038 | ret = update_block_group(trans, root, ins->objectid, ins->offset, 1, 0); |
f5947066 CM |
2039 | if (ret) { |
2040 | printk("update block group failed for %Lu %Lu\n", | |
2041 | ins->objectid, ins->offset); | |
2042 | BUG(); | |
2043 | } | |
925baedd CM |
2044 | out: |
2045 | maybe_unlock_mutex(root); | |
2046 | return ret; | |
fec577fb | 2047 | } |
fec577fb CM |
2048 | /* |
2049 | * helper function to allocate a block for a given tree | |
2050 | * returns the tree buffer or NULL. | |
2051 | */ | |
5f39d397 | 2052 | struct extent_buffer *btrfs_alloc_free_block(struct btrfs_trans_handle *trans, |
7bb86316 CM |
2053 | struct btrfs_root *root, |
2054 | u32 blocksize, | |
2055 | u64 root_objectid, | |
2056 | u64 ref_generation, | |
2057 | u64 first_objectid, | |
2058 | int level, | |
2059 | u64 hint, | |
5f39d397 | 2060 | u64 empty_size) |
fec577fb | 2061 | { |
e2fa7227 | 2062 | struct btrfs_key ins; |
fec577fb | 2063 | int ret; |
5f39d397 | 2064 | struct extent_buffer *buf; |
fec577fb | 2065 | |
98d20f67 | 2066 | ret = btrfs_alloc_extent(trans, root, blocksize, blocksize, |
7bb86316 | 2067 | root_objectid, ref_generation, |
f6dbff55 | 2068 | level, first_objectid, empty_size, hint, |
db94535d | 2069 | (u64)-1, &ins, 0); |
fec577fb | 2070 | if (ret) { |
54aa1f4d CM |
2071 | BUG_ON(ret > 0); |
2072 | return ERR_PTR(ret); | |
fec577fb | 2073 | } |
db94535d | 2074 | buf = btrfs_find_create_tree_block(root, ins.objectid, blocksize); |
54aa1f4d | 2075 | if (!buf) { |
7bb86316 CM |
2076 | btrfs_free_extent(trans, root, ins.objectid, blocksize, |
2077 | root->root_key.objectid, ref_generation, | |
2078 | 0, 0, 0); | |
54aa1f4d CM |
2079 | return ERR_PTR(-ENOMEM); |
2080 | } | |
55c69072 | 2081 | btrfs_set_header_generation(buf, trans->transid); |
925baedd | 2082 | btrfs_tree_lock(buf); |
55c69072 | 2083 | clean_tree_block(trans, root, buf); |
5f39d397 | 2084 | btrfs_set_buffer_uptodate(buf); |
55c69072 CM |
2085 | |
2086 | if (PageDirty(buf->first_page)) { | |
2087 | printk("page %lu dirty\n", buf->first_page->index); | |
2088 | WARN_ON(1); | |
2089 | } | |
2090 | ||
5f39d397 CM |
2091 | set_extent_dirty(&trans->transaction->dirty_pages, buf->start, |
2092 | buf->start + buf->len - 1, GFP_NOFS); | |
9afbb0b7 CM |
2093 | if (!btrfs_test_opt(root, SSD)) |
2094 | btrfs_set_buffer_defrag(buf); | |
d3c2fdcf | 2095 | trans->blocks_used++; |
fec577fb CM |
2096 | return buf; |
2097 | } | |
a28ec197 | 2098 | |
98ed5174 CM |
2099 | static int noinline drop_leaf_ref(struct btrfs_trans_handle *trans, |
2100 | struct btrfs_root *root, | |
2101 | struct extent_buffer *leaf) | |
6407bf6d | 2102 | { |
7bb86316 CM |
2103 | u64 leaf_owner; |
2104 | u64 leaf_generation; | |
5f39d397 | 2105 | struct btrfs_key key; |
6407bf6d CM |
2106 | struct btrfs_file_extent_item *fi; |
2107 | int i; | |
2108 | int nritems; | |
2109 | int ret; | |
2110 | ||
5f39d397 CM |
2111 | BUG_ON(!btrfs_is_leaf(leaf)); |
2112 | nritems = btrfs_header_nritems(leaf); | |
7bb86316 CM |
2113 | leaf_owner = btrfs_header_owner(leaf); |
2114 | leaf_generation = btrfs_header_generation(leaf); | |
2115 | ||
6407bf6d | 2116 | for (i = 0; i < nritems; i++) { |
db94535d | 2117 | u64 disk_bytenr; |
5f39d397 CM |
2118 | |
2119 | btrfs_item_key_to_cpu(leaf, &key, i); | |
2120 | if (btrfs_key_type(&key) != BTRFS_EXTENT_DATA_KEY) | |
6407bf6d CM |
2121 | continue; |
2122 | fi = btrfs_item_ptr(leaf, i, struct btrfs_file_extent_item); | |
5f39d397 CM |
2123 | if (btrfs_file_extent_type(leaf, fi) == |
2124 | BTRFS_FILE_EXTENT_INLINE) | |
236454df | 2125 | continue; |
6407bf6d CM |
2126 | /* |
2127 | * FIXME make sure to insert a trans record that | |
2128 | * repeats the snapshot del on crash | |
2129 | */ | |
db94535d CM |
2130 | disk_bytenr = btrfs_file_extent_disk_bytenr(leaf, fi); |
2131 | if (disk_bytenr == 0) | |
3a686375 | 2132 | continue; |
925baedd | 2133 | ret = __btrfs_free_extent(trans, root, disk_bytenr, |
7bb86316 CM |
2134 | btrfs_file_extent_disk_num_bytes(leaf, fi), |
2135 | leaf_owner, leaf_generation, | |
2136 | key.objectid, key.offset, 0); | |
6407bf6d CM |
2137 | BUG_ON(ret); |
2138 | } | |
2139 | return 0; | |
2140 | } | |
2141 | ||
98ed5174 | 2142 | static void noinline reada_walk_down(struct btrfs_root *root, |
bea495e5 CM |
2143 | struct extent_buffer *node, |
2144 | int slot) | |
e011599b | 2145 | { |
db94535d | 2146 | u64 bytenr; |
bea495e5 CM |
2147 | u64 last = 0; |
2148 | u32 nritems; | |
e011599b | 2149 | u32 refs; |
db94535d | 2150 | u32 blocksize; |
bea495e5 CM |
2151 | int ret; |
2152 | int i; | |
2153 | int level; | |
2154 | int skipped = 0; | |
e011599b | 2155 | |
5f39d397 | 2156 | nritems = btrfs_header_nritems(node); |
db94535d | 2157 | level = btrfs_header_level(node); |
bea495e5 CM |
2158 | if (level) |
2159 | return; | |
2160 | ||
2161 | for (i = slot; i < nritems && skipped < 32; i++) { | |
db94535d | 2162 | bytenr = btrfs_node_blockptr(node, i); |
bea495e5 CM |
2163 | if (last && ((bytenr > last && bytenr - last > 32 * 1024) || |
2164 | (last > bytenr && last - bytenr > 32 * 1024))) { | |
2165 | skipped++; | |
e011599b | 2166 | continue; |
bea495e5 CM |
2167 | } |
2168 | blocksize = btrfs_level_size(root, level - 1); | |
2169 | if (i != slot) { | |
2170 | ret = lookup_extent_ref(NULL, root, bytenr, | |
2171 | blocksize, &refs); | |
2172 | BUG_ON(ret); | |
2173 | if (refs != 1) { | |
2174 | skipped++; | |
2175 | continue; | |
2176 | } | |
2177 | } | |
a2135011 | 2178 | mutex_unlock(&root->fs_info->alloc_mutex); |
ca7a79ad CM |
2179 | ret = readahead_tree_block(root, bytenr, blocksize, |
2180 | btrfs_node_ptr_generation(node, i)); | |
bea495e5 | 2181 | last = bytenr + blocksize; |
409eb95d | 2182 | cond_resched(); |
a2135011 | 2183 | mutex_lock(&root->fs_info->alloc_mutex); |
e011599b CM |
2184 | if (ret) |
2185 | break; | |
2186 | } | |
2187 | } | |
2188 | ||
9aca1d51 CM |
2189 | /* |
2190 | * helper function for drop_snapshot, this walks down the tree dropping ref | |
2191 | * counts as it goes. | |
2192 | */ | |
98ed5174 CM |
2193 | static int noinline walk_down_tree(struct btrfs_trans_handle *trans, |
2194 | struct btrfs_root *root, | |
2195 | struct btrfs_path *path, int *level) | |
20524f02 | 2196 | { |
7bb86316 CM |
2197 | u64 root_owner; |
2198 | u64 root_gen; | |
2199 | u64 bytenr; | |
ca7a79ad | 2200 | u64 ptr_gen; |
5f39d397 CM |
2201 | struct extent_buffer *next; |
2202 | struct extent_buffer *cur; | |
7bb86316 | 2203 | struct extent_buffer *parent; |
db94535d | 2204 | u32 blocksize; |
20524f02 CM |
2205 | int ret; |
2206 | u32 refs; | |
2207 | ||
925baedd CM |
2208 | mutex_lock(&root->fs_info->alloc_mutex); |
2209 | ||
5caf2a00 CM |
2210 | WARN_ON(*level < 0); |
2211 | WARN_ON(*level >= BTRFS_MAX_LEVEL); | |
5f39d397 | 2212 | ret = lookup_extent_ref(trans, root, |
db94535d CM |
2213 | path->nodes[*level]->start, |
2214 | path->nodes[*level]->len, &refs); | |
20524f02 CM |
2215 | BUG_ON(ret); |
2216 | if (refs > 1) | |
2217 | goto out; | |
e011599b | 2218 | |
9aca1d51 CM |
2219 | /* |
2220 | * walk down to the last node level and free all the leaves | |
2221 | */ | |
6407bf6d | 2222 | while(*level >= 0) { |
5caf2a00 CM |
2223 | WARN_ON(*level < 0); |
2224 | WARN_ON(*level >= BTRFS_MAX_LEVEL); | |
20524f02 | 2225 | cur = path->nodes[*level]; |
e011599b | 2226 | |
5f39d397 | 2227 | if (btrfs_header_level(cur) != *level) |
2c90e5d6 | 2228 | WARN_ON(1); |
e011599b | 2229 | |
7518a238 | 2230 | if (path->slots[*level] >= |
5f39d397 | 2231 | btrfs_header_nritems(cur)) |
20524f02 | 2232 | break; |
6407bf6d CM |
2233 | if (*level == 0) { |
2234 | ret = drop_leaf_ref(trans, root, cur); | |
2235 | BUG_ON(ret); | |
2236 | break; | |
2237 | } | |
db94535d | 2238 | bytenr = btrfs_node_blockptr(cur, path->slots[*level]); |
ca7a79ad | 2239 | ptr_gen = btrfs_node_ptr_generation(cur, path->slots[*level]); |
db94535d | 2240 | blocksize = btrfs_level_size(root, *level - 1); |
925baedd | 2241 | |
db94535d | 2242 | ret = lookup_extent_ref(trans, root, bytenr, blocksize, &refs); |
6407bf6d CM |
2243 | BUG_ON(ret); |
2244 | if (refs != 1) { | |
7bb86316 CM |
2245 | parent = path->nodes[*level]; |
2246 | root_owner = btrfs_header_owner(parent); | |
2247 | root_gen = btrfs_header_generation(parent); | |
20524f02 | 2248 | path->slots[*level]++; |
925baedd | 2249 | ret = __btrfs_free_extent(trans, root, bytenr, |
7bb86316 CM |
2250 | blocksize, root_owner, |
2251 | root_gen, 0, 0, 1); | |
20524f02 CM |
2252 | BUG_ON(ret); |
2253 | continue; | |
2254 | } | |
db94535d | 2255 | next = btrfs_find_tree_block(root, bytenr, blocksize); |
1259ab75 | 2256 | if (!next || !btrfs_buffer_uptodate(next, ptr_gen)) { |
5f39d397 | 2257 | free_extent_buffer(next); |
bea495e5 | 2258 | reada_walk_down(root, cur, path->slots[*level]); |
8790d502 | 2259 | |
925baedd | 2260 | mutex_unlock(&root->fs_info->alloc_mutex); |
ca7a79ad CM |
2261 | next = read_tree_block(root, bytenr, blocksize, |
2262 | ptr_gen); | |
925baedd | 2263 | mutex_lock(&root->fs_info->alloc_mutex); |
e9d0b13b | 2264 | |
8790d502 | 2265 | /* we've dropped the lock, double check */ |
db94535d CM |
2266 | ret = lookup_extent_ref(trans, root, bytenr, |
2267 | blocksize, &refs); | |
e9d0b13b CM |
2268 | BUG_ON(ret); |
2269 | if (refs != 1) { | |
7bb86316 CM |
2270 | parent = path->nodes[*level]; |
2271 | root_owner = btrfs_header_owner(parent); | |
2272 | root_gen = btrfs_header_generation(parent); | |
2273 | ||
e9d0b13b | 2274 | path->slots[*level]++; |
5f39d397 | 2275 | free_extent_buffer(next); |
925baedd | 2276 | ret = __btrfs_free_extent(trans, root, bytenr, |
7bb86316 CM |
2277 | blocksize, |
2278 | root_owner, | |
2279 | root_gen, 0, 0, 1); | |
e9d0b13b CM |
2280 | BUG_ON(ret); |
2281 | continue; | |
2282 | } | |
2283 | } | |
5caf2a00 | 2284 | WARN_ON(*level <= 0); |
83e15a28 | 2285 | if (path->nodes[*level-1]) |
5f39d397 | 2286 | free_extent_buffer(path->nodes[*level-1]); |
20524f02 | 2287 | path->nodes[*level-1] = next; |
5f39d397 | 2288 | *level = btrfs_header_level(next); |
20524f02 CM |
2289 | path->slots[*level] = 0; |
2290 | } | |
2291 | out: | |
5caf2a00 CM |
2292 | WARN_ON(*level < 0); |
2293 | WARN_ON(*level >= BTRFS_MAX_LEVEL); | |
7bb86316 CM |
2294 | |
2295 | if (path->nodes[*level] == root->node) { | |
2296 | root_owner = root->root_key.objectid; | |
2297 | parent = path->nodes[*level]; | |
2298 | } else { | |
2299 | parent = path->nodes[*level + 1]; | |
2300 | root_owner = btrfs_header_owner(parent); | |
2301 | } | |
2302 | ||
2303 | root_gen = btrfs_header_generation(parent); | |
925baedd | 2304 | ret = __btrfs_free_extent(trans, root, path->nodes[*level]->start, |
7bb86316 CM |
2305 | path->nodes[*level]->len, |
2306 | root_owner, root_gen, 0, 0, 1); | |
5f39d397 | 2307 | free_extent_buffer(path->nodes[*level]); |
20524f02 CM |
2308 | path->nodes[*level] = NULL; |
2309 | *level += 1; | |
2310 | BUG_ON(ret); | |
925baedd | 2311 | mutex_unlock(&root->fs_info->alloc_mutex); |
20524f02 CM |
2312 | return 0; |
2313 | } | |
2314 | ||
9aca1d51 CM |
2315 | /* |
2316 | * helper for dropping snapshots. This walks back up the tree in the path | |
2317 | * to find the first node higher up where we haven't yet gone through | |
2318 | * all the slots | |
2319 | */ | |
98ed5174 CM |
2320 | static int noinline walk_up_tree(struct btrfs_trans_handle *trans, |
2321 | struct btrfs_root *root, | |
2322 | struct btrfs_path *path, int *level) | |
20524f02 | 2323 | { |
7bb86316 CM |
2324 | u64 root_owner; |
2325 | u64 root_gen; | |
2326 | struct btrfs_root_item *root_item = &root->root_item; | |
20524f02 CM |
2327 | int i; |
2328 | int slot; | |
2329 | int ret; | |
9f3a7427 | 2330 | |
234b63a0 | 2331 | for(i = *level; i < BTRFS_MAX_LEVEL - 1 && path->nodes[i]; i++) { |
20524f02 | 2332 | slot = path->slots[i]; |
5f39d397 CM |
2333 | if (slot < btrfs_header_nritems(path->nodes[i]) - 1) { |
2334 | struct extent_buffer *node; | |
2335 | struct btrfs_disk_key disk_key; | |
2336 | node = path->nodes[i]; | |
20524f02 CM |
2337 | path->slots[i]++; |
2338 | *level = i; | |
9f3a7427 | 2339 | WARN_ON(*level == 0); |
5f39d397 | 2340 | btrfs_node_key(node, &disk_key, path->slots[i]); |
9f3a7427 | 2341 | memcpy(&root_item->drop_progress, |
5f39d397 | 2342 | &disk_key, sizeof(disk_key)); |
9f3a7427 | 2343 | root_item->drop_level = i; |
20524f02 CM |
2344 | return 0; |
2345 | } else { | |
7bb86316 CM |
2346 | if (path->nodes[*level] == root->node) { |
2347 | root_owner = root->root_key.objectid; | |
2348 | root_gen = | |
2349 | btrfs_header_generation(path->nodes[*level]); | |
2350 | } else { | |
2351 | struct extent_buffer *node; | |
2352 | node = path->nodes[*level + 1]; | |
2353 | root_owner = btrfs_header_owner(node); | |
2354 | root_gen = btrfs_header_generation(node); | |
2355 | } | |
e089f05c | 2356 | ret = btrfs_free_extent(trans, root, |
db94535d | 2357 | path->nodes[*level]->start, |
7bb86316 CM |
2358 | path->nodes[*level]->len, |
2359 | root_owner, root_gen, 0, 0, 1); | |
6407bf6d | 2360 | BUG_ON(ret); |
5f39d397 | 2361 | free_extent_buffer(path->nodes[*level]); |
83e15a28 | 2362 | path->nodes[*level] = NULL; |
20524f02 | 2363 | *level = i + 1; |
20524f02 CM |
2364 | } |
2365 | } | |
2366 | return 1; | |
2367 | } | |
2368 | ||
9aca1d51 CM |
2369 | /* |
2370 | * drop the reference count on the tree rooted at 'snap'. This traverses | |
2371 | * the tree freeing any blocks that have a ref count of zero after being | |
2372 | * decremented. | |
2373 | */ | |
e089f05c | 2374 | int btrfs_drop_snapshot(struct btrfs_trans_handle *trans, struct btrfs_root |
9f3a7427 | 2375 | *root) |
20524f02 | 2376 | { |
3768f368 | 2377 | int ret = 0; |
9aca1d51 | 2378 | int wret; |
20524f02 | 2379 | int level; |
5caf2a00 | 2380 | struct btrfs_path *path; |
20524f02 CM |
2381 | int i; |
2382 | int orig_level; | |
9f3a7427 | 2383 | struct btrfs_root_item *root_item = &root->root_item; |
20524f02 | 2384 | |
a2135011 | 2385 | WARN_ON(!mutex_is_locked(&root->fs_info->drop_mutex)); |
5caf2a00 CM |
2386 | path = btrfs_alloc_path(); |
2387 | BUG_ON(!path); | |
20524f02 | 2388 | |
5f39d397 | 2389 | level = btrfs_header_level(root->node); |
20524f02 | 2390 | orig_level = level; |
9f3a7427 CM |
2391 | if (btrfs_disk_key_objectid(&root_item->drop_progress) == 0) { |
2392 | path->nodes[level] = root->node; | |
f510cfec | 2393 | extent_buffer_get(root->node); |
9f3a7427 CM |
2394 | path->slots[level] = 0; |
2395 | } else { | |
2396 | struct btrfs_key key; | |
5f39d397 CM |
2397 | struct btrfs_disk_key found_key; |
2398 | struct extent_buffer *node; | |
6702ed49 | 2399 | |
9f3a7427 | 2400 | btrfs_disk_key_to_cpu(&key, &root_item->drop_progress); |
6702ed49 CM |
2401 | level = root_item->drop_level; |
2402 | path->lowest_level = level; | |
9f3a7427 | 2403 | wret = btrfs_search_slot(NULL, root, &key, path, 0, 0); |
6702ed49 | 2404 | if (wret < 0) { |
9f3a7427 CM |
2405 | ret = wret; |
2406 | goto out; | |
2407 | } | |
5f39d397 CM |
2408 | node = path->nodes[level]; |
2409 | btrfs_node_key(node, &found_key, path->slots[level]); | |
2410 | WARN_ON(memcmp(&found_key, &root_item->drop_progress, | |
2411 | sizeof(found_key))); | |
925baedd CM |
2412 | for (i = 0; i < BTRFS_MAX_LEVEL; i++) { |
2413 | if (path->nodes[i] && path->locks[i]) { | |
2414 | path->locks[i] = 0; | |
2415 | btrfs_tree_unlock(path->nodes[i]); | |
2416 | } | |
2417 | } | |
9f3a7427 | 2418 | } |
20524f02 | 2419 | while(1) { |
5caf2a00 | 2420 | wret = walk_down_tree(trans, root, path, &level); |
9aca1d51 | 2421 | if (wret > 0) |
20524f02 | 2422 | break; |
9aca1d51 CM |
2423 | if (wret < 0) |
2424 | ret = wret; | |
2425 | ||
5caf2a00 | 2426 | wret = walk_up_tree(trans, root, path, &level); |
9aca1d51 | 2427 | if (wret > 0) |
20524f02 | 2428 | break; |
9aca1d51 CM |
2429 | if (wret < 0) |
2430 | ret = wret; | |
409eb95d | 2431 | ret = -EAGAIN; |
409eb95d | 2432 | break; |
20524f02 | 2433 | } |
83e15a28 | 2434 | for (i = 0; i <= orig_level; i++) { |
5caf2a00 | 2435 | if (path->nodes[i]) { |
5f39d397 | 2436 | free_extent_buffer(path->nodes[i]); |
0f82731f | 2437 | path->nodes[i] = NULL; |
83e15a28 | 2438 | } |
20524f02 | 2439 | } |
9f3a7427 | 2440 | out: |
5caf2a00 | 2441 | btrfs_free_path(path); |
9aca1d51 | 2442 | return ret; |
20524f02 | 2443 | } |
9078a3e1 | 2444 | |
96b5179d | 2445 | int btrfs_free_block_groups(struct btrfs_fs_info *info) |
9078a3e1 | 2446 | { |
96b5179d CM |
2447 | u64 start; |
2448 | u64 end; | |
b97f9203 | 2449 | u64 ptr; |
9078a3e1 | 2450 | int ret; |
925baedd CM |
2451 | |
2452 | mutex_lock(&info->alloc_mutex); | |
9078a3e1 | 2453 | while(1) { |
96b5179d CM |
2454 | ret = find_first_extent_bit(&info->block_group_cache, 0, |
2455 | &start, &end, (unsigned int)-1); | |
2456 | if (ret) | |
9078a3e1 | 2457 | break; |
b97f9203 Y |
2458 | ret = get_state_private(&info->block_group_cache, start, &ptr); |
2459 | if (!ret) | |
2460 | kfree((void *)(unsigned long)ptr); | |
96b5179d CM |
2461 | clear_extent_bits(&info->block_group_cache, start, |
2462 | end, (unsigned int)-1, GFP_NOFS); | |
9078a3e1 | 2463 | } |
e37c9e69 | 2464 | while(1) { |
f510cfec CM |
2465 | ret = find_first_extent_bit(&info->free_space_cache, 0, |
2466 | &start, &end, EXTENT_DIRTY); | |
2467 | if (ret) | |
e37c9e69 | 2468 | break; |
f510cfec CM |
2469 | clear_extent_dirty(&info->free_space_cache, start, |
2470 | end, GFP_NOFS); | |
e37c9e69 | 2471 | } |
925baedd | 2472 | mutex_unlock(&info->alloc_mutex); |
be744175 CM |
2473 | return 0; |
2474 | } | |
2475 | ||
8e7bf94f CM |
2476 | static unsigned long calc_ra(unsigned long start, unsigned long last, |
2477 | unsigned long nr) | |
2478 | { | |
2479 | return min(last, start + nr - 1); | |
2480 | } | |
2481 | ||
98ed5174 CM |
2482 | static int noinline relocate_inode_pages(struct inode *inode, u64 start, |
2483 | u64 len) | |
edbd8d4e CM |
2484 | { |
2485 | u64 page_start; | |
2486 | u64 page_end; | |
edbd8d4e | 2487 | unsigned long last_index; |
edbd8d4e CM |
2488 | unsigned long i; |
2489 | struct page *page; | |
d1310b2e | 2490 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; |
4313b399 | 2491 | struct file_ra_state *ra; |
8e7bf94f CM |
2492 | unsigned long total_read = 0; |
2493 | unsigned long ra_pages; | |
a061fc8d | 2494 | struct btrfs_trans_handle *trans; |
4313b399 CM |
2495 | |
2496 | ra = kzalloc(sizeof(*ra), GFP_NOFS); | |
edbd8d4e CM |
2497 | |
2498 | mutex_lock(&inode->i_mutex); | |
4313b399 | 2499 | i = start >> PAGE_CACHE_SHIFT; |
edbd8d4e CM |
2500 | last_index = (start + len - 1) >> PAGE_CACHE_SHIFT; |
2501 | ||
8e7bf94f CM |
2502 | ra_pages = BTRFS_I(inode)->root->fs_info->bdi.ra_pages; |
2503 | ||
4313b399 | 2504 | file_ra_state_init(ra, inode->i_mapping); |
edbd8d4e | 2505 | |
4313b399 | 2506 | for (; i <= last_index; i++) { |
8e7bf94f CM |
2507 | if (total_read % ra_pages == 0) { |
2508 | btrfs_force_ra(inode->i_mapping, ra, NULL, i, | |
2509 | calc_ra(i, last_index, ra_pages)); | |
2510 | } | |
2511 | total_read++; | |
a061fc8d CM |
2512 | if (((u64)i << PAGE_CACHE_SHIFT) > inode->i_size) |
2513 | goto truncate_racing; | |
2514 | ||
edbd8d4e | 2515 | page = grab_cache_page(inode->i_mapping, i); |
a061fc8d | 2516 | if (!page) { |
edbd8d4e | 2517 | goto out_unlock; |
a061fc8d | 2518 | } |
edbd8d4e CM |
2519 | if (!PageUptodate(page)) { |
2520 | btrfs_readpage(NULL, page); | |
2521 | lock_page(page); | |
2522 | if (!PageUptodate(page)) { | |
2523 | unlock_page(page); | |
2524 | page_cache_release(page); | |
2525 | goto out_unlock; | |
2526 | } | |
2527 | } | |
ec44a35c CM |
2528 | #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,18) |
2529 | ClearPageDirty(page); | |
2530 | #else | |
2531 | cancel_dirty_page(page, PAGE_CACHE_SIZE); | |
2532 | #endif | |
2533 | wait_on_page_writeback(page); | |
2534 | set_page_extent_mapped(page); | |
edbd8d4e CM |
2535 | page_start = (u64)page->index << PAGE_CACHE_SHIFT; |
2536 | page_end = page_start + PAGE_CACHE_SIZE - 1; | |
2537 | ||
d1310b2e | 2538 | lock_extent(io_tree, page_start, page_end, GFP_NOFS); |
edbd8d4e | 2539 | |
d1310b2e | 2540 | set_extent_delalloc(io_tree, page_start, |
edbd8d4e | 2541 | page_end, GFP_NOFS); |
a061fc8d | 2542 | set_page_dirty(page); |
edbd8d4e | 2543 | |
d1310b2e | 2544 | unlock_extent(io_tree, page_start, page_end, GFP_NOFS); |
edbd8d4e CM |
2545 | unlock_page(page); |
2546 | page_cache_release(page); | |
2547 | } | |
a061fc8d CM |
2548 | balance_dirty_pages_ratelimited_nr(inode->i_mapping, |
2549 | total_read); | |
edbd8d4e CM |
2550 | |
2551 | out_unlock: | |
ec44a35c | 2552 | kfree(ra); |
a061fc8d CM |
2553 | trans = btrfs_start_transaction(BTRFS_I(inode)->root, 1); |
2554 | if (trans) { | |
2555 | btrfs_add_ordered_inode(inode); | |
2556 | btrfs_end_transaction(trans, BTRFS_I(inode)->root); | |
2557 | mark_inode_dirty(inode); | |
2558 | } | |
edbd8d4e CM |
2559 | mutex_unlock(&inode->i_mutex); |
2560 | return 0; | |
a061fc8d CM |
2561 | |
2562 | truncate_racing: | |
2563 | vmtruncate(inode, inode->i_size); | |
2564 | balance_dirty_pages_ratelimited_nr(inode->i_mapping, | |
2565 | total_read); | |
2566 | goto out_unlock; | |
edbd8d4e CM |
2567 | } |
2568 | ||
bf4ef679 CM |
2569 | /* |
2570 | * The back references tell us which tree holds a ref on a block, | |
2571 | * but it is possible for the tree root field in the reference to | |
2572 | * reflect the original root before a snapshot was made. In this | |
2573 | * case we should search through all the children of a given root | |
2574 | * to find potential holders of references on a block. | |
2575 | * | |
2576 | * Instead, we do something a little less fancy and just search | |
2577 | * all the roots for a given key/block combination. | |
2578 | */ | |
2579 | static int find_root_for_ref(struct btrfs_root *root, | |
2580 | struct btrfs_path *path, | |
2581 | struct btrfs_key *key0, | |
2582 | int level, | |
2583 | int file_key, | |
2584 | struct btrfs_root **found_root, | |
2585 | u64 bytenr) | |
2586 | { | |
2587 | struct btrfs_key root_location; | |
2588 | struct btrfs_root *cur_root = *found_root; | |
2589 | struct btrfs_file_extent_item *file_extent; | |
2590 | u64 root_search_start = BTRFS_FS_TREE_OBJECTID; | |
2591 | u64 found_bytenr; | |
2592 | int ret; | |
2593 | int i; | |
2594 | ||
2595 | root_location.offset = (u64)-1; | |
2596 | root_location.type = BTRFS_ROOT_ITEM_KEY; | |
2597 | path->lowest_level = level; | |
2598 | path->reada = 0; | |
2599 | while(1) { | |
2600 | ret = btrfs_search_slot(NULL, cur_root, key0, path, 0, 0); | |
2601 | found_bytenr = 0; | |
2602 | if (ret == 0 && file_key) { | |
2603 | struct extent_buffer *leaf = path->nodes[0]; | |
2604 | file_extent = btrfs_item_ptr(leaf, path->slots[0], | |
2605 | struct btrfs_file_extent_item); | |
2606 | if (btrfs_file_extent_type(leaf, file_extent) == | |
2607 | BTRFS_FILE_EXTENT_REG) { | |
2608 | found_bytenr = | |
2609 | btrfs_file_extent_disk_bytenr(leaf, | |
2610 | file_extent); | |
2611 | } | |
323da79c | 2612 | } else if (!file_key) { |
bf4ef679 CM |
2613 | if (path->nodes[level]) |
2614 | found_bytenr = path->nodes[level]->start; | |
2615 | } | |
2616 | ||
2617 | for (i = level; i < BTRFS_MAX_LEVEL; i++) { | |
2618 | if (!path->nodes[i]) | |
2619 | break; | |
2620 | free_extent_buffer(path->nodes[i]); | |
2621 | path->nodes[i] = NULL; | |
2622 | } | |
2623 | btrfs_release_path(cur_root, path); | |
2624 | ||
2625 | if (found_bytenr == bytenr) { | |
2626 | *found_root = cur_root; | |
2627 | ret = 0; | |
2628 | goto out; | |
2629 | } | |
2630 | ret = btrfs_search_root(root->fs_info->tree_root, | |
2631 | root_search_start, &root_search_start); | |
2632 | if (ret) | |
2633 | break; | |
2634 | ||
2635 | root_location.objectid = root_search_start; | |
2636 | cur_root = btrfs_read_fs_root_no_name(root->fs_info, | |
2637 | &root_location); | |
2638 | if (!cur_root) { | |
2639 | ret = 1; | |
2640 | break; | |
2641 | } | |
2642 | } | |
2643 | out: | |
2644 | path->lowest_level = 0; | |
2645 | return ret; | |
2646 | } | |
2647 | ||
4313b399 CM |
2648 | /* |
2649 | * note, this releases the path | |
2650 | */ | |
98ed5174 | 2651 | static int noinline relocate_one_reference(struct btrfs_root *extent_root, |
edbd8d4e | 2652 | struct btrfs_path *path, |
0ef3e66b CM |
2653 | struct btrfs_key *extent_key, |
2654 | u64 *last_file_objectid, | |
2655 | u64 *last_file_offset, | |
2656 | u64 *last_file_root, | |
2657 | u64 last_extent) | |
edbd8d4e CM |
2658 | { |
2659 | struct inode *inode; | |
2660 | struct btrfs_root *found_root; | |
bf4ef679 CM |
2661 | struct btrfs_key root_location; |
2662 | struct btrfs_key found_key; | |
4313b399 CM |
2663 | struct btrfs_extent_ref *ref; |
2664 | u64 ref_root; | |
2665 | u64 ref_gen; | |
2666 | u64 ref_objectid; | |
2667 | u64 ref_offset; | |
edbd8d4e | 2668 | int ret; |
bf4ef679 | 2669 | int level; |
edbd8d4e | 2670 | |
4313b399 CM |
2671 | ref = btrfs_item_ptr(path->nodes[0], path->slots[0], |
2672 | struct btrfs_extent_ref); | |
2673 | ref_root = btrfs_ref_root(path->nodes[0], ref); | |
2674 | ref_gen = btrfs_ref_generation(path->nodes[0], ref); | |
2675 | ref_objectid = btrfs_ref_objectid(path->nodes[0], ref); | |
2676 | ref_offset = btrfs_ref_offset(path->nodes[0], ref); | |
2677 | btrfs_release_path(extent_root, path); | |
2678 | ||
bf4ef679 | 2679 | root_location.objectid = ref_root; |
edbd8d4e | 2680 | if (ref_gen == 0) |
bf4ef679 | 2681 | root_location.offset = 0; |
edbd8d4e | 2682 | else |
bf4ef679 CM |
2683 | root_location.offset = (u64)-1; |
2684 | root_location.type = BTRFS_ROOT_ITEM_KEY; | |
edbd8d4e CM |
2685 | |
2686 | found_root = btrfs_read_fs_root_no_name(extent_root->fs_info, | |
bf4ef679 | 2687 | &root_location); |
edbd8d4e CM |
2688 | BUG_ON(!found_root); |
2689 | ||
2690 | if (ref_objectid >= BTRFS_FIRST_FREE_OBJECTID) { | |
bf4ef679 CM |
2691 | found_key.objectid = ref_objectid; |
2692 | found_key.type = BTRFS_EXTENT_DATA_KEY; | |
2693 | found_key.offset = ref_offset; | |
2694 | level = 0; | |
2695 | ||
0ef3e66b CM |
2696 | if (last_extent == extent_key->objectid && |
2697 | *last_file_objectid == ref_objectid && | |
2698 | *last_file_offset == ref_offset && | |
2699 | *last_file_root == ref_root) | |
2700 | goto out; | |
2701 | ||
bf4ef679 CM |
2702 | ret = find_root_for_ref(extent_root, path, &found_key, |
2703 | level, 1, &found_root, | |
2704 | extent_key->objectid); | |
2705 | ||
2706 | if (ret) | |
2707 | goto out; | |
2708 | ||
0ef3e66b CM |
2709 | if (last_extent == extent_key->objectid && |
2710 | *last_file_objectid == ref_objectid && | |
2711 | *last_file_offset == ref_offset && | |
2712 | *last_file_root == ref_root) | |
2713 | goto out; | |
2714 | ||
edbd8d4e CM |
2715 | inode = btrfs_iget_locked(extent_root->fs_info->sb, |
2716 | ref_objectid, found_root); | |
2717 | if (inode->i_state & I_NEW) { | |
2718 | /* the inode and parent dir are two different roots */ | |
2719 | BTRFS_I(inode)->root = found_root; | |
2720 | BTRFS_I(inode)->location.objectid = ref_objectid; | |
2721 | BTRFS_I(inode)->location.type = BTRFS_INODE_ITEM_KEY; | |
2722 | BTRFS_I(inode)->location.offset = 0; | |
2723 | btrfs_read_locked_inode(inode); | |
2724 | unlock_new_inode(inode); | |
2725 | ||
2726 | } | |
2727 | /* this can happen if the reference is not against | |
2728 | * the latest version of the tree root | |
2729 | */ | |
2730 | if (is_bad_inode(inode)) { | |
edbd8d4e CM |
2731 | goto out; |
2732 | } | |
0ef3e66b CM |
2733 | *last_file_objectid = inode->i_ino; |
2734 | *last_file_root = found_root->root_key.objectid; | |
2735 | *last_file_offset = ref_offset; | |
2736 | ||
edbd8d4e | 2737 | relocate_inode_pages(inode, ref_offset, extent_key->offset); |
edbd8d4e | 2738 | iput(inode); |
edbd8d4e CM |
2739 | } else { |
2740 | struct btrfs_trans_handle *trans; | |
edbd8d4e | 2741 | struct extent_buffer *eb; |
edbd8d4e CM |
2742 | int i; |
2743 | ||
edbd8d4e | 2744 | eb = read_tree_block(found_root, extent_key->objectid, |
ca7a79ad | 2745 | extent_key->offset, 0); |
925baedd | 2746 | btrfs_tree_lock(eb); |
edbd8d4e CM |
2747 | level = btrfs_header_level(eb); |
2748 | ||
2749 | if (level == 0) | |
2750 | btrfs_item_key_to_cpu(eb, &found_key, 0); | |
2751 | else | |
2752 | btrfs_node_key_to_cpu(eb, &found_key, 0); | |
2753 | ||
925baedd | 2754 | btrfs_tree_unlock(eb); |
edbd8d4e CM |
2755 | free_extent_buffer(eb); |
2756 | ||
bf4ef679 CM |
2757 | ret = find_root_for_ref(extent_root, path, &found_key, |
2758 | level, 0, &found_root, | |
2759 | extent_key->objectid); | |
2760 | ||
2761 | if (ret) | |
2762 | goto out; | |
2763 | ||
2764 | trans = btrfs_start_transaction(found_root, 1); | |
2765 | ||
edbd8d4e | 2766 | path->lowest_level = level; |
8f662a76 | 2767 | path->reada = 2; |
edbd8d4e CM |
2768 | ret = btrfs_search_slot(trans, found_root, &found_key, path, |
2769 | 0, 1); | |
2770 | path->lowest_level = 0; | |
2771 | for (i = level; i < BTRFS_MAX_LEVEL; i++) { | |
2772 | if (!path->nodes[i]) | |
2773 | break; | |
2774 | free_extent_buffer(path->nodes[i]); | |
2775 | path->nodes[i] = NULL; | |
2776 | } | |
2777 | btrfs_release_path(found_root, path); | |
0ef3e66b CM |
2778 | if (found_root == found_root->fs_info->extent_root) |
2779 | btrfs_extent_post_op(trans, found_root); | |
edbd8d4e CM |
2780 | btrfs_end_transaction(trans, found_root); |
2781 | } | |
2782 | ||
2783 | out: | |
2784 | return 0; | |
2785 | } | |
2786 | ||
a061fc8d CM |
2787 | static int noinline del_extent_zero(struct btrfs_root *extent_root, |
2788 | struct btrfs_path *path, | |
2789 | struct btrfs_key *extent_key) | |
2790 | { | |
2791 | int ret; | |
2792 | struct btrfs_trans_handle *trans; | |
2793 | ||
2794 | trans = btrfs_start_transaction(extent_root, 1); | |
2795 | ret = btrfs_search_slot(trans, extent_root, extent_key, path, -1, 1); | |
2796 | if (ret > 0) { | |
2797 | ret = -EIO; | |
2798 | goto out; | |
2799 | } | |
2800 | if (ret < 0) | |
2801 | goto out; | |
2802 | ret = btrfs_del_item(trans, extent_root, path); | |
2803 | out: | |
2804 | btrfs_end_transaction(trans, extent_root); | |
2805 | return ret; | |
2806 | } | |
2807 | ||
98ed5174 CM |
2808 | static int noinline relocate_one_extent(struct btrfs_root *extent_root, |
2809 | struct btrfs_path *path, | |
2810 | struct btrfs_key *extent_key) | |
edbd8d4e CM |
2811 | { |
2812 | struct btrfs_key key; | |
2813 | struct btrfs_key found_key; | |
edbd8d4e | 2814 | struct extent_buffer *leaf; |
0ef3e66b CM |
2815 | u64 last_file_objectid = 0; |
2816 | u64 last_file_root = 0; | |
2817 | u64 last_file_offset = (u64)-1; | |
2818 | u64 last_extent = 0; | |
edbd8d4e CM |
2819 | u32 nritems; |
2820 | u32 item_size; | |
2821 | int ret = 0; | |
2822 | ||
a061fc8d CM |
2823 | if (extent_key->objectid == 0) { |
2824 | ret = del_extent_zero(extent_root, path, extent_key); | |
2825 | goto out; | |
2826 | } | |
edbd8d4e CM |
2827 | key.objectid = extent_key->objectid; |
2828 | key.type = BTRFS_EXTENT_REF_KEY; | |
2829 | key.offset = 0; | |
2830 | ||
2831 | while(1) { | |
2832 | ret = btrfs_search_slot(NULL, extent_root, &key, path, 0, 0); | |
2833 | ||
edbd8d4e CM |
2834 | if (ret < 0) |
2835 | goto out; | |
2836 | ||
2837 | ret = 0; | |
2838 | leaf = path->nodes[0]; | |
2839 | nritems = btrfs_header_nritems(leaf); | |
a061fc8d CM |
2840 | if (path->slots[0] == nritems) { |
2841 | ret = btrfs_next_leaf(extent_root, path); | |
2842 | if (ret > 0) { | |
2843 | ret = 0; | |
2844 | goto out; | |
2845 | } | |
2846 | if (ret < 0) | |
2847 | goto out; | |
bf4ef679 | 2848 | leaf = path->nodes[0]; |
a061fc8d | 2849 | } |
edbd8d4e CM |
2850 | |
2851 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); | |
a061fc8d | 2852 | if (found_key.objectid != extent_key->objectid) { |
edbd8d4e | 2853 | break; |
a061fc8d | 2854 | } |
edbd8d4e | 2855 | |
a061fc8d | 2856 | if (found_key.type != BTRFS_EXTENT_REF_KEY) { |
edbd8d4e | 2857 | break; |
a061fc8d | 2858 | } |
edbd8d4e CM |
2859 | |
2860 | key.offset = found_key.offset + 1; | |
2861 | item_size = btrfs_item_size_nr(leaf, path->slots[0]); | |
2862 | ||
0ef3e66b CM |
2863 | ret = relocate_one_reference(extent_root, path, extent_key, |
2864 | &last_file_objectid, | |
2865 | &last_file_offset, | |
2866 | &last_file_root, last_extent); | |
edbd8d4e CM |
2867 | if (ret) |
2868 | goto out; | |
0ef3e66b | 2869 | last_extent = extent_key->objectid; |
edbd8d4e CM |
2870 | } |
2871 | ret = 0; | |
2872 | out: | |
2873 | btrfs_release_path(extent_root, path); | |
2874 | return ret; | |
2875 | } | |
2876 | ||
ec44a35c CM |
2877 | static u64 update_block_group_flags(struct btrfs_root *root, u64 flags) |
2878 | { | |
2879 | u64 num_devices; | |
2880 | u64 stripped = BTRFS_BLOCK_GROUP_RAID0 | | |
2881 | BTRFS_BLOCK_GROUP_RAID1 | BTRFS_BLOCK_GROUP_RAID10; | |
2882 | ||
a061fc8d | 2883 | num_devices = root->fs_info->fs_devices->num_devices; |
ec44a35c CM |
2884 | if (num_devices == 1) { |
2885 | stripped |= BTRFS_BLOCK_GROUP_DUP; | |
2886 | stripped = flags & ~stripped; | |
2887 | ||
2888 | /* turn raid0 into single device chunks */ | |
2889 | if (flags & BTRFS_BLOCK_GROUP_RAID0) | |
2890 | return stripped; | |
2891 | ||
2892 | /* turn mirroring into duplication */ | |
2893 | if (flags & (BTRFS_BLOCK_GROUP_RAID1 | | |
2894 | BTRFS_BLOCK_GROUP_RAID10)) | |
2895 | return stripped | BTRFS_BLOCK_GROUP_DUP; | |
2896 | return flags; | |
2897 | } else { | |
2898 | /* they already had raid on here, just return */ | |
ec44a35c CM |
2899 | if (flags & stripped) |
2900 | return flags; | |
2901 | ||
2902 | stripped |= BTRFS_BLOCK_GROUP_DUP; | |
2903 | stripped = flags & ~stripped; | |
2904 | ||
2905 | /* switch duplicated blocks with raid1 */ | |
2906 | if (flags & BTRFS_BLOCK_GROUP_DUP) | |
2907 | return stripped | BTRFS_BLOCK_GROUP_RAID1; | |
2908 | ||
2909 | /* turn single device chunks into raid0 */ | |
2910 | return stripped | BTRFS_BLOCK_GROUP_RAID0; | |
2911 | } | |
2912 | return flags; | |
2913 | } | |
2914 | ||
0ef3e66b CM |
2915 | int __alloc_chunk_for_shrink(struct btrfs_root *root, |
2916 | struct btrfs_block_group_cache *shrink_block_group, | |
2917 | int force) | |
2918 | { | |
2919 | struct btrfs_trans_handle *trans; | |
2920 | u64 new_alloc_flags; | |
2921 | u64 calc; | |
2922 | ||
2923 | if (btrfs_block_group_used(&shrink_block_group->item) > 0) { | |
2924 | ||
2925 | trans = btrfs_start_transaction(root, 1); | |
2926 | new_alloc_flags = update_block_group_flags(root, | |
2927 | shrink_block_group->flags); | |
2928 | if (new_alloc_flags != shrink_block_group->flags) { | |
2929 | calc = | |
2930 | btrfs_block_group_used(&shrink_block_group->item); | |
2931 | } else { | |
2932 | calc = shrink_block_group->key.offset; | |
2933 | } | |
2934 | do_chunk_alloc(trans, root->fs_info->extent_root, | |
2935 | calc + 2 * 1024 * 1024, new_alloc_flags, force); | |
2936 | btrfs_end_transaction(trans, root); | |
2937 | } | |
2938 | return 0; | |
2939 | } | |
2940 | ||
8f18cf13 | 2941 | int btrfs_shrink_extent_tree(struct btrfs_root *root, u64 shrink_start) |
edbd8d4e CM |
2942 | { |
2943 | struct btrfs_trans_handle *trans; | |
2944 | struct btrfs_root *tree_root = root->fs_info->tree_root; | |
2945 | struct btrfs_path *path; | |
2946 | u64 cur_byte; | |
2947 | u64 total_found; | |
8f18cf13 CM |
2948 | u64 shrink_last_byte; |
2949 | struct btrfs_block_group_cache *shrink_block_group; | |
edbd8d4e | 2950 | struct btrfs_fs_info *info = root->fs_info; |
edbd8d4e | 2951 | struct btrfs_key key; |
73e48b27 | 2952 | struct btrfs_key found_key; |
edbd8d4e CM |
2953 | struct extent_buffer *leaf; |
2954 | u32 nritems; | |
2955 | int ret; | |
a061fc8d | 2956 | int progress; |
edbd8d4e | 2957 | |
925baedd | 2958 | mutex_lock(&root->fs_info->alloc_mutex); |
8f18cf13 CM |
2959 | shrink_block_group = btrfs_lookup_block_group(root->fs_info, |
2960 | shrink_start); | |
2961 | BUG_ON(!shrink_block_group); | |
2962 | ||
0ef3e66b CM |
2963 | shrink_last_byte = shrink_block_group->key.objectid + |
2964 | shrink_block_group->key.offset; | |
8f18cf13 CM |
2965 | |
2966 | shrink_block_group->space_info->total_bytes -= | |
2967 | shrink_block_group->key.offset; | |
edbd8d4e CM |
2968 | path = btrfs_alloc_path(); |
2969 | root = root->fs_info->extent_root; | |
8f662a76 | 2970 | path->reada = 2; |
edbd8d4e | 2971 | |
323da79c CM |
2972 | printk("btrfs relocating block group %llu flags %llu\n", |
2973 | (unsigned long long)shrink_start, | |
2974 | (unsigned long long)shrink_block_group->flags); | |
2975 | ||
0ef3e66b CM |
2976 | __alloc_chunk_for_shrink(root, shrink_block_group, 1); |
2977 | ||
edbd8d4e | 2978 | again: |
323da79c | 2979 | |
8f18cf13 CM |
2980 | shrink_block_group->ro = 1; |
2981 | ||
edbd8d4e | 2982 | total_found = 0; |
a061fc8d | 2983 | progress = 0; |
8f18cf13 | 2984 | key.objectid = shrink_start; |
edbd8d4e CM |
2985 | key.offset = 0; |
2986 | key.type = 0; | |
73e48b27 | 2987 | cur_byte = key.objectid; |
4313b399 | 2988 | |
73e48b27 Y |
2989 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); |
2990 | if (ret < 0) | |
2991 | goto out; | |
2992 | ||
0b86a832 | 2993 | ret = btrfs_previous_item(root, path, 0, BTRFS_EXTENT_ITEM_KEY); |
73e48b27 Y |
2994 | if (ret < 0) |
2995 | goto out; | |
8f18cf13 | 2996 | |
73e48b27 Y |
2997 | if (ret == 0) { |
2998 | leaf = path->nodes[0]; | |
2999 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); | |
8f18cf13 CM |
3000 | if (found_key.objectid + found_key.offset > shrink_start && |
3001 | found_key.objectid < shrink_last_byte) { | |
73e48b27 Y |
3002 | cur_byte = found_key.objectid; |
3003 | key.objectid = cur_byte; | |
3004 | } | |
3005 | } | |
3006 | btrfs_release_path(root, path); | |
3007 | ||
3008 | while(1) { | |
edbd8d4e CM |
3009 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); |
3010 | if (ret < 0) | |
3011 | goto out; | |
73e48b27 | 3012 | |
edbd8d4e | 3013 | leaf = path->nodes[0]; |
73e48b27 Y |
3014 | nritems = btrfs_header_nritems(leaf); |
3015 | next: | |
3016 | if (path->slots[0] >= nritems) { | |
3017 | ret = btrfs_next_leaf(root, path); | |
3018 | if (ret < 0) | |
3019 | goto out; | |
3020 | if (ret == 1) { | |
3021 | ret = 0; | |
3022 | break; | |
edbd8d4e | 3023 | } |
73e48b27 Y |
3024 | leaf = path->nodes[0]; |
3025 | nritems = btrfs_header_nritems(leaf); | |
edbd8d4e | 3026 | } |
73e48b27 Y |
3027 | |
3028 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); | |
725c8463 | 3029 | |
8f18cf13 CM |
3030 | if (found_key.objectid >= shrink_last_byte) |
3031 | break; | |
3032 | ||
725c8463 CM |
3033 | if (progress && need_resched()) { |
3034 | memcpy(&key, &found_key, sizeof(key)); | |
725c8463 | 3035 | cond_resched(); |
725c8463 CM |
3036 | btrfs_release_path(root, path); |
3037 | btrfs_search_slot(NULL, root, &key, path, 0, 0); | |
3038 | progress = 0; | |
3039 | goto next; | |
3040 | } | |
3041 | progress = 1; | |
3042 | ||
73e48b27 Y |
3043 | if (btrfs_key_type(&found_key) != BTRFS_EXTENT_ITEM_KEY || |
3044 | found_key.objectid + found_key.offset <= cur_byte) { | |
0ef3e66b CM |
3045 | memcpy(&key, &found_key, sizeof(key)); |
3046 | key.offset++; | |
edbd8d4e | 3047 | path->slots[0]++; |
edbd8d4e CM |
3048 | goto next; |
3049 | } | |
73e48b27 | 3050 | |
edbd8d4e CM |
3051 | total_found++; |
3052 | cur_byte = found_key.objectid + found_key.offset; | |
3053 | key.objectid = cur_byte; | |
3054 | btrfs_release_path(root, path); | |
3055 | ret = relocate_one_extent(root, path, &found_key); | |
0ef3e66b | 3056 | __alloc_chunk_for_shrink(root, shrink_block_group, 0); |
edbd8d4e CM |
3057 | } |
3058 | ||
3059 | btrfs_release_path(root, path); | |
3060 | ||
3061 | if (total_found > 0) { | |
323da79c CM |
3062 | printk("btrfs relocate found %llu last extent was %llu\n", |
3063 | (unsigned long long)total_found, | |
3064 | (unsigned long long)found_key.objectid); | |
edbd8d4e CM |
3065 | trans = btrfs_start_transaction(tree_root, 1); |
3066 | btrfs_commit_transaction(trans, tree_root); | |
3067 | ||
edbd8d4e | 3068 | btrfs_clean_old_snapshots(tree_root); |
edbd8d4e CM |
3069 | |
3070 | trans = btrfs_start_transaction(tree_root, 1); | |
3071 | btrfs_commit_transaction(trans, tree_root); | |
3072 | goto again; | |
3073 | } | |
3074 | ||
8f18cf13 CM |
3075 | /* |
3076 | * we've freed all the extents, now remove the block | |
3077 | * group item from the tree | |
3078 | */ | |
edbd8d4e | 3079 | trans = btrfs_start_transaction(root, 1); |
8f18cf13 | 3080 | memcpy(&key, &shrink_block_group->key, sizeof(key)); |
1372f8e6 | 3081 | |
8f18cf13 CM |
3082 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); |
3083 | if (ret > 0) | |
3084 | ret = -EIO; | |
3085 | if (ret < 0) | |
3086 | goto out; | |
73e48b27 | 3087 | |
0ef3e66b CM |
3088 | clear_extent_bits(&info->block_group_cache, key.objectid, |
3089 | key.objectid + key.offset - 1, | |
8f18cf13 | 3090 | (unsigned int)-1, GFP_NOFS); |
edbd8d4e | 3091 | |
0ef3e66b CM |
3092 | |
3093 | clear_extent_bits(&info->free_space_cache, | |
3094 | key.objectid, key.objectid + key.offset - 1, | |
3095 | (unsigned int)-1, GFP_NOFS); | |
3096 | ||
3097 | memset(shrink_block_group, 0, sizeof(*shrink_block_group)); | |
3098 | kfree(shrink_block_group); | |
3099 | ||
8f18cf13 | 3100 | btrfs_del_item(trans, root, path); |
edbd8d4e | 3101 | btrfs_commit_transaction(trans, root); |
0ef3e66b CM |
3102 | |
3103 | /* the code to unpin extents might set a few bits in the free | |
3104 | * space cache for this range again | |
3105 | */ | |
3106 | clear_extent_bits(&info->free_space_cache, | |
3107 | key.objectid, key.objectid + key.offset - 1, | |
3108 | (unsigned int)-1, GFP_NOFS); | |
edbd8d4e CM |
3109 | out: |
3110 | btrfs_free_path(path); | |
925baedd | 3111 | mutex_unlock(&root->fs_info->alloc_mutex); |
edbd8d4e CM |
3112 | return ret; |
3113 | } | |
3114 | ||
0b86a832 CM |
3115 | int find_first_block_group(struct btrfs_root *root, struct btrfs_path *path, |
3116 | struct btrfs_key *key) | |
3117 | { | |
925baedd | 3118 | int ret = 0; |
0b86a832 CM |
3119 | struct btrfs_key found_key; |
3120 | struct extent_buffer *leaf; | |
3121 | int slot; | |
edbd8d4e | 3122 | |
0b86a832 CM |
3123 | ret = btrfs_search_slot(NULL, root, key, path, 0, 0); |
3124 | if (ret < 0) | |
925baedd CM |
3125 | goto out; |
3126 | ||
0b86a832 CM |
3127 | while(1) { |
3128 | slot = path->slots[0]; | |
edbd8d4e | 3129 | leaf = path->nodes[0]; |
0b86a832 CM |
3130 | if (slot >= btrfs_header_nritems(leaf)) { |
3131 | ret = btrfs_next_leaf(root, path); | |
3132 | if (ret == 0) | |
3133 | continue; | |
3134 | if (ret < 0) | |
925baedd | 3135 | goto out; |
0b86a832 | 3136 | break; |
edbd8d4e | 3137 | } |
0b86a832 | 3138 | btrfs_item_key_to_cpu(leaf, &found_key, slot); |
edbd8d4e | 3139 | |
0b86a832 | 3140 | if (found_key.objectid >= key->objectid && |
925baedd CM |
3141 | found_key.type == BTRFS_BLOCK_GROUP_ITEM_KEY) { |
3142 | ret = 0; | |
3143 | goto out; | |
3144 | } | |
0b86a832 | 3145 | path->slots[0]++; |
edbd8d4e | 3146 | } |
0b86a832 | 3147 | ret = -ENOENT; |
925baedd | 3148 | out: |
0b86a832 | 3149 | return ret; |
edbd8d4e CM |
3150 | } |
3151 | ||
9078a3e1 CM |
3152 | int btrfs_read_block_groups(struct btrfs_root *root) |
3153 | { | |
3154 | struct btrfs_path *path; | |
3155 | int ret; | |
96b5179d | 3156 | int bit; |
9078a3e1 | 3157 | struct btrfs_block_group_cache *cache; |
be744175 | 3158 | struct btrfs_fs_info *info = root->fs_info; |
6324fbf3 | 3159 | struct btrfs_space_info *space_info; |
d1310b2e | 3160 | struct extent_io_tree *block_group_cache; |
9078a3e1 CM |
3161 | struct btrfs_key key; |
3162 | struct btrfs_key found_key; | |
5f39d397 | 3163 | struct extent_buffer *leaf; |
96b5179d CM |
3164 | |
3165 | block_group_cache = &info->block_group_cache; | |
be744175 | 3166 | root = info->extent_root; |
9078a3e1 | 3167 | key.objectid = 0; |
0b86a832 | 3168 | key.offset = 0; |
9078a3e1 | 3169 | btrfs_set_key_type(&key, BTRFS_BLOCK_GROUP_ITEM_KEY); |
9078a3e1 CM |
3170 | path = btrfs_alloc_path(); |
3171 | if (!path) | |
3172 | return -ENOMEM; | |
3173 | ||
925baedd | 3174 | mutex_lock(&root->fs_info->alloc_mutex); |
9078a3e1 | 3175 | while(1) { |
0b86a832 CM |
3176 | ret = find_first_block_group(root, path, &key); |
3177 | if (ret > 0) { | |
3178 | ret = 0; | |
3179 | goto error; | |
9078a3e1 | 3180 | } |
0b86a832 CM |
3181 | if (ret != 0) |
3182 | goto error; | |
3183 | ||
5f39d397 CM |
3184 | leaf = path->nodes[0]; |
3185 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); | |
8f18cf13 | 3186 | cache = kzalloc(sizeof(*cache), GFP_NOFS); |
9078a3e1 | 3187 | if (!cache) { |
0b86a832 | 3188 | ret = -ENOMEM; |
9078a3e1 CM |
3189 | break; |
3190 | } | |
3e1ad54f | 3191 | |
5f39d397 CM |
3192 | read_extent_buffer(leaf, &cache->item, |
3193 | btrfs_item_ptr_offset(leaf, path->slots[0]), | |
3194 | sizeof(cache->item)); | |
9078a3e1 | 3195 | memcpy(&cache->key, &found_key, sizeof(found_key)); |
0b86a832 | 3196 | |
9078a3e1 CM |
3197 | key.objectid = found_key.objectid + found_key.offset; |
3198 | btrfs_release_path(root, path); | |
0b86a832 CM |
3199 | cache->flags = btrfs_block_group_flags(&cache->item); |
3200 | bit = 0; | |
3201 | if (cache->flags & BTRFS_BLOCK_GROUP_DATA) { | |
96b5179d | 3202 | bit = BLOCK_GROUP_DATA; |
0b86a832 CM |
3203 | } else if (cache->flags & BTRFS_BLOCK_GROUP_SYSTEM) { |
3204 | bit = BLOCK_GROUP_SYSTEM; | |
3205 | } else if (cache->flags & BTRFS_BLOCK_GROUP_METADATA) { | |
96b5179d | 3206 | bit = BLOCK_GROUP_METADATA; |
31f3c99b | 3207 | } |
8790d502 | 3208 | set_avail_alloc_bits(info, cache->flags); |
96b5179d | 3209 | |
6324fbf3 CM |
3210 | ret = update_space_info(info, cache->flags, found_key.offset, |
3211 | btrfs_block_group_used(&cache->item), | |
3212 | &space_info); | |
3213 | BUG_ON(ret); | |
3214 | cache->space_info = space_info; | |
3215 | ||
96b5179d CM |
3216 | /* use EXTENT_LOCKED to prevent merging */ |
3217 | set_extent_bits(block_group_cache, found_key.objectid, | |
3218 | found_key.objectid + found_key.offset - 1, | |
3219 | bit | EXTENT_LOCKED, GFP_NOFS); | |
3220 | set_state_private(block_group_cache, found_key.objectid, | |
ae2f5411 | 3221 | (unsigned long)cache); |
96b5179d | 3222 | |
9078a3e1 | 3223 | if (key.objectid >= |
db94535d | 3224 | btrfs_super_total_bytes(&info->super_copy)) |
9078a3e1 CM |
3225 | break; |
3226 | } | |
0b86a832 CM |
3227 | ret = 0; |
3228 | error: | |
9078a3e1 | 3229 | btrfs_free_path(path); |
925baedd | 3230 | mutex_unlock(&root->fs_info->alloc_mutex); |
0b86a832 | 3231 | return ret; |
9078a3e1 | 3232 | } |
6324fbf3 CM |
3233 | |
3234 | int btrfs_make_block_group(struct btrfs_trans_handle *trans, | |
3235 | struct btrfs_root *root, u64 bytes_used, | |
e17cade2 | 3236 | u64 type, u64 chunk_objectid, u64 chunk_offset, |
6324fbf3 CM |
3237 | u64 size) |
3238 | { | |
3239 | int ret; | |
3240 | int bit = 0; | |
3241 | struct btrfs_root *extent_root; | |
3242 | struct btrfs_block_group_cache *cache; | |
3243 | struct extent_io_tree *block_group_cache; | |
3244 | ||
3245 | extent_root = root->fs_info->extent_root; | |
3246 | block_group_cache = &root->fs_info->block_group_cache; | |
3247 | ||
8f18cf13 | 3248 | cache = kzalloc(sizeof(*cache), GFP_NOFS); |
6324fbf3 | 3249 | BUG_ON(!cache); |
e17cade2 | 3250 | cache->key.objectid = chunk_offset; |
6324fbf3 | 3251 | cache->key.offset = size; |
6324fbf3 | 3252 | btrfs_set_key_type(&cache->key, BTRFS_BLOCK_GROUP_ITEM_KEY); |
0ef3e66b | 3253 | |
6324fbf3 | 3254 | btrfs_set_block_group_used(&cache->item, bytes_used); |
6324fbf3 CM |
3255 | btrfs_set_block_group_chunk_objectid(&cache->item, chunk_objectid); |
3256 | cache->flags = type; | |
3257 | btrfs_set_block_group_flags(&cache->item, type); | |
3258 | ||
3259 | ret = update_space_info(root->fs_info, cache->flags, size, bytes_used, | |
3260 | &cache->space_info); | |
3261 | BUG_ON(ret); | |
3262 | ||
d18a2c44 | 3263 | bit = block_group_state_bits(type); |
e17cade2 CM |
3264 | set_extent_bits(block_group_cache, chunk_offset, |
3265 | chunk_offset + size - 1, | |
6324fbf3 | 3266 | bit | EXTENT_LOCKED, GFP_NOFS); |
6324fbf3 | 3267 | |
e17cade2 CM |
3268 | set_state_private(block_group_cache, chunk_offset, |
3269 | (unsigned long)cache); | |
6324fbf3 CM |
3270 | ret = btrfs_insert_item(trans, extent_root, &cache->key, &cache->item, |
3271 | sizeof(cache->item)); | |
3272 | BUG_ON(ret); | |
3273 | ||
3274 | finish_current_insert(trans, extent_root); | |
3275 | ret = del_pending_extents(trans, extent_root); | |
3276 | BUG_ON(ret); | |
d18a2c44 | 3277 | set_avail_alloc_bits(extent_root->fs_info, type); |
925baedd | 3278 | |
6324fbf3 CM |
3279 | return 0; |
3280 | } |