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" |
fec577fb | 28 | |
0b86a832 | 29 | #define BLOCK_GROUP_DATA EXTENT_WRITEBACK |
96b5179d | 30 | #define BLOCK_GROUP_METADATA EXTENT_UPTODATE |
0b86a832 CM |
31 | #define BLOCK_GROUP_SYSTEM EXTENT_NEW |
32 | ||
96b5179d CM |
33 | #define BLOCK_GROUP_DIRTY EXTENT_DIRTY |
34 | ||
e089f05c CM |
35 | static int finish_current_insert(struct btrfs_trans_handle *trans, struct |
36 | btrfs_root *extent_root); | |
e20d96d6 CM |
37 | static int del_pending_extents(struct btrfs_trans_handle *trans, struct |
38 | btrfs_root *extent_root); | |
d548ee51 | 39 | |
fec577fb | 40 | |
e37c9e69 CM |
41 | static int cache_block_group(struct btrfs_root *root, |
42 | struct btrfs_block_group_cache *block_group) | |
43 | { | |
44 | struct btrfs_path *path; | |
45 | int ret; | |
46 | struct btrfs_key key; | |
5f39d397 | 47 | struct extent_buffer *leaf; |
d1310b2e | 48 | struct extent_io_tree *free_space_cache; |
e37c9e69 | 49 | int slot; |
e37c9e69 CM |
50 | u64 last = 0; |
51 | u64 hole_size; | |
7d7d6068 | 52 | u64 first_free; |
e37c9e69 CM |
53 | int found = 0; |
54 | ||
00f5c795 CM |
55 | if (!block_group) |
56 | return 0; | |
57 | ||
e37c9e69 | 58 | root = root->fs_info->extent_root; |
f510cfec | 59 | free_space_cache = &root->fs_info->free_space_cache; |
e37c9e69 CM |
60 | |
61 | if (block_group->cached) | |
62 | return 0; | |
f510cfec | 63 | |
e37c9e69 CM |
64 | path = btrfs_alloc_path(); |
65 | if (!path) | |
66 | return -ENOMEM; | |
7d7d6068 | 67 | |
2cc58cf2 | 68 | path->reada = 2; |
7d7d6068 | 69 | first_free = block_group->key.objectid; |
e37c9e69 | 70 | key.objectid = block_group->key.objectid; |
e37c9e69 CM |
71 | key.offset = 0; |
72 | btrfs_set_key_type(&key, BTRFS_EXTENT_ITEM_KEY); | |
73 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); | |
74 | if (ret < 0) | |
75 | return ret; | |
0b86a832 | 76 | ret = btrfs_previous_item(root, path, 0, BTRFS_EXTENT_ITEM_KEY); |
d548ee51 Y |
77 | if (ret < 0) |
78 | return ret; | |
79 | if (ret == 0) { | |
80 | leaf = path->nodes[0]; | |
81 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); | |
82 | if (key.objectid + key.offset > first_free) | |
83 | first_free = key.objectid + key.offset; | |
84 | } | |
e37c9e69 | 85 | while(1) { |
5f39d397 | 86 | leaf = path->nodes[0]; |
e37c9e69 | 87 | slot = path->slots[0]; |
5f39d397 | 88 | if (slot >= btrfs_header_nritems(leaf)) { |
e37c9e69 | 89 | ret = btrfs_next_leaf(root, path); |
54aa1f4d CM |
90 | if (ret < 0) |
91 | goto err; | |
de428b63 | 92 | if (ret == 0) { |
e37c9e69 | 93 | continue; |
de428b63 | 94 | } else { |
e37c9e69 CM |
95 | break; |
96 | } | |
97 | } | |
5f39d397 | 98 | btrfs_item_key_to_cpu(leaf, &key, slot); |
7d7d6068 | 99 | if (key.objectid < block_group->key.objectid) { |
7d7d6068 Y |
100 | goto next; |
101 | } | |
e37c9e69 CM |
102 | if (key.objectid >= block_group->key.objectid + |
103 | block_group->key.offset) { | |
e37c9e69 CM |
104 | break; |
105 | } | |
7d7d6068 | 106 | |
e37c9e69 CM |
107 | if (btrfs_key_type(&key) == BTRFS_EXTENT_ITEM_KEY) { |
108 | if (!found) { | |
7d7d6068 | 109 | last = first_free; |
e37c9e69 | 110 | found = 1; |
e37c9e69 | 111 | } |
f510cfec CM |
112 | if (key.objectid > last) { |
113 | hole_size = key.objectid - last; | |
114 | set_extent_dirty(free_space_cache, last, | |
115 | last + hole_size - 1, | |
116 | GFP_NOFS); | |
7d7d6068 Y |
117 | } |
118 | last = key.objectid + key.offset; | |
e37c9e69 | 119 | } |
7d7d6068 | 120 | next: |
e37c9e69 CM |
121 | path->slots[0]++; |
122 | } | |
123 | ||
7d7d6068 Y |
124 | if (!found) |
125 | last = first_free; | |
126 | if (block_group->key.objectid + | |
127 | block_group->key.offset > last) { | |
128 | hole_size = block_group->key.objectid + | |
129 | block_group->key.offset - last; | |
f510cfec CM |
130 | set_extent_dirty(free_space_cache, last, |
131 | last + hole_size - 1, GFP_NOFS); | |
7d7d6068 | 132 | } |
e37c9e69 | 133 | block_group->cached = 1; |
54aa1f4d | 134 | err: |
e37c9e69 CM |
135 | btrfs_free_path(path); |
136 | return 0; | |
137 | } | |
138 | ||
5276aeda CM |
139 | struct btrfs_block_group_cache *btrfs_lookup_block_group(struct |
140 | btrfs_fs_info *info, | |
db94535d | 141 | u64 bytenr) |
be744175 | 142 | { |
d1310b2e | 143 | struct extent_io_tree *block_group_cache; |
96b5179d CM |
144 | struct btrfs_block_group_cache *block_group = NULL; |
145 | u64 ptr; | |
146 | u64 start; | |
147 | u64 end; | |
be744175 CM |
148 | int ret; |
149 | ||
a061fc8d CM |
150 | bytenr = max_t(u64, bytenr, |
151 | BTRFS_SUPER_INFO_OFFSET + BTRFS_SUPER_INFO_SIZE); | |
96b5179d CM |
152 | block_group_cache = &info->block_group_cache; |
153 | ret = find_first_extent_bit(block_group_cache, | |
db94535d | 154 | bytenr, &start, &end, |
0b86a832 CM |
155 | BLOCK_GROUP_DATA | BLOCK_GROUP_METADATA | |
156 | BLOCK_GROUP_SYSTEM); | |
be744175 | 157 | if (ret) { |
96b5179d | 158 | return NULL; |
be744175 | 159 | } |
96b5179d CM |
160 | ret = get_state_private(block_group_cache, start, &ptr); |
161 | if (ret) | |
162 | return NULL; | |
163 | ||
ae2f5411 | 164 | block_group = (struct btrfs_block_group_cache *)(unsigned long)ptr; |
5cf66426 | 165 | if (block_group->key.objectid <= bytenr && bytenr < |
96b5179d CM |
166 | block_group->key.objectid + block_group->key.offset) |
167 | return block_group; | |
be744175 CM |
168 | return NULL; |
169 | } | |
0b86a832 CM |
170 | |
171 | static int block_group_bits(struct btrfs_block_group_cache *cache, u64 bits) | |
172 | { | |
593060d7 | 173 | return (cache->flags & bits) == bits; |
0b86a832 CM |
174 | } |
175 | ||
176 | static int noinline find_search_start(struct btrfs_root *root, | |
98ed5174 | 177 | struct btrfs_block_group_cache **cache_ret, |
0b86a832 | 178 | u64 *start_ret, int num, int data) |
e37c9e69 | 179 | { |
e37c9e69 CM |
180 | int ret; |
181 | struct btrfs_block_group_cache *cache = *cache_ret; | |
d7fc640e | 182 | struct extent_io_tree *free_space_cache; |
7d1660d4 | 183 | struct extent_state *state; |
e19caa5f | 184 | u64 last; |
f510cfec | 185 | u64 start = 0; |
257d0ce3 | 186 | u64 cache_miss = 0; |
c31f8830 | 187 | u64 total_fs_bytes; |
0b86a832 | 188 | u64 search_start = *start_ret; |
f84a8b36 | 189 | int wrapped = 0; |
e37c9e69 | 190 | |
0b86a832 | 191 | if (!cache) |
1a2b2ac7 | 192 | goto out; |
8f18cf13 | 193 | |
c31f8830 | 194 | total_fs_bytes = btrfs_super_total_bytes(&root->fs_info->super_copy); |
d7fc640e CM |
195 | free_space_cache = &root->fs_info->free_space_cache; |
196 | ||
e37c9e69 | 197 | again: |
54aa1f4d CM |
198 | ret = cache_block_group(root, cache); |
199 | if (ret) | |
200 | goto out; | |
f84a8b36 | 201 | |
e19caa5f | 202 | last = max(search_start, cache->key.objectid); |
8f18cf13 | 203 | if (!block_group_bits(cache, data) || cache->ro) { |
0b86a832 CM |
204 | goto new_group; |
205 | } | |
e19caa5f | 206 | |
7d1660d4 CM |
207 | spin_lock_irq(&free_space_cache->lock); |
208 | state = find_first_extent_bit_state(free_space_cache, last, EXTENT_DIRTY); | |
e37c9e69 | 209 | while(1) { |
7d1660d4 | 210 | if (!state) { |
257d0ce3 CM |
211 | if (!cache_miss) |
212 | cache_miss = last; | |
7d1660d4 | 213 | spin_unlock_irq(&free_space_cache->lock); |
e19caa5f CM |
214 | goto new_group; |
215 | } | |
f510cfec | 216 | |
7d1660d4 CM |
217 | start = max(last, state->start); |
218 | last = state->end + 1; | |
257d0ce3 CM |
219 | if (last - start < num) { |
220 | if (last == cache->key.objectid + cache->key.offset) | |
221 | cache_miss = start; | |
7d1660d4 CM |
222 | do { |
223 | state = extent_state_next(state); | |
224 | } while(state && !(state->state & EXTENT_DIRTY)); | |
f510cfec | 225 | continue; |
257d0ce3 | 226 | } |
7d1660d4 | 227 | spin_unlock_irq(&free_space_cache->lock); |
8f18cf13 CM |
228 | if (cache->ro) |
229 | goto new_group; | |
0b86a832 | 230 | if (start + num > cache->key.objectid + cache->key.offset) |
e37c9e69 | 231 | goto new_group; |
c31f8830 CM |
232 | if (start + num > total_fs_bytes) |
233 | goto new_group; | |
8790d502 | 234 | if (!block_group_bits(cache, data)) { |
611f0e00 | 235 | printk("block group bits don't match %Lu %d\n", cache->flags, data); |
8790d502 | 236 | } |
0b86a832 CM |
237 | *start_ret = start; |
238 | return 0; | |
8790d502 CM |
239 | } |
240 | out: | |
1a2b2ac7 CM |
241 | cache = btrfs_lookup_block_group(root->fs_info, search_start); |
242 | if (!cache) { | |
0b86a832 | 243 | printk("Unable to find block group for %Lu\n", search_start); |
1a2b2ac7 | 244 | WARN_ON(1); |
1a2b2ac7 | 245 | } |
0b86a832 | 246 | return -ENOSPC; |
e37c9e69 CM |
247 | |
248 | new_group: | |
e19caa5f | 249 | last = cache->key.objectid + cache->key.offset; |
f84a8b36 | 250 | wrapped: |
e19caa5f | 251 | cache = btrfs_lookup_block_group(root->fs_info, last); |
c31f8830 | 252 | if (!cache || cache->key.objectid >= total_fs_bytes) { |
0e4de584 | 253 | no_cache: |
f84a8b36 CM |
254 | if (!wrapped) { |
255 | wrapped = 1; | |
256 | last = search_start; | |
f84a8b36 CM |
257 | goto wrapped; |
258 | } | |
1a2b2ac7 | 259 | goto out; |
e37c9e69 | 260 | } |
257d0ce3 CM |
261 | if (cache_miss && !cache->cached) { |
262 | cache_block_group(root, cache); | |
263 | last = cache_miss; | |
257d0ce3 CM |
264 | cache = btrfs_lookup_block_group(root->fs_info, last); |
265 | } | |
1a2b2ac7 | 266 | cache = btrfs_find_block_group(root, cache, last, data, 0); |
0e4de584 CM |
267 | if (!cache) |
268 | goto no_cache; | |
e37c9e69 | 269 | *cache_ret = cache; |
257d0ce3 | 270 | cache_miss = 0; |
e37c9e69 CM |
271 | goto again; |
272 | } | |
273 | ||
84f54cfa CM |
274 | static u64 div_factor(u64 num, int factor) |
275 | { | |
257d0ce3 CM |
276 | if (factor == 10) |
277 | return num; | |
84f54cfa CM |
278 | num *= factor; |
279 | do_div(num, 10); | |
280 | return num; | |
281 | } | |
282 | ||
6324fbf3 CM |
283 | static int block_group_state_bits(u64 flags) |
284 | { | |
285 | int bits = 0; | |
286 | if (flags & BTRFS_BLOCK_GROUP_DATA) | |
287 | bits |= BLOCK_GROUP_DATA; | |
288 | if (flags & BTRFS_BLOCK_GROUP_METADATA) | |
289 | bits |= BLOCK_GROUP_METADATA; | |
290 | if (flags & BTRFS_BLOCK_GROUP_SYSTEM) | |
291 | bits |= BLOCK_GROUP_SYSTEM; | |
292 | return bits; | |
293 | } | |
294 | ||
31f3c99b CM |
295 | struct btrfs_block_group_cache *btrfs_find_block_group(struct btrfs_root *root, |
296 | struct btrfs_block_group_cache | |
be744175 | 297 | *hint, u64 search_start, |
de428b63 | 298 | int data, int owner) |
cd1bc465 | 299 | { |
96b5179d | 300 | struct btrfs_block_group_cache *cache; |
d1310b2e | 301 | struct extent_io_tree *block_group_cache; |
31f3c99b | 302 | struct btrfs_block_group_cache *found_group = NULL; |
cd1bc465 CM |
303 | struct btrfs_fs_info *info = root->fs_info; |
304 | u64 used; | |
31f3c99b CM |
305 | u64 last = 0; |
306 | u64 hint_last; | |
96b5179d CM |
307 | u64 start; |
308 | u64 end; | |
309 | u64 free_check; | |
310 | u64 ptr; | |
c31f8830 | 311 | u64 total_fs_bytes; |
96b5179d | 312 | int bit; |
cd1bc465 | 313 | int ret; |
31f3c99b | 314 | int full_search = 0; |
bce4eae9 | 315 | int factor = 10; |
de428b63 | 316 | |
96b5179d | 317 | block_group_cache = &info->block_group_cache; |
c31f8830 | 318 | total_fs_bytes = btrfs_super_total_bytes(&root->fs_info->super_copy); |
96b5179d | 319 | |
a236aed1 CM |
320 | if (data & BTRFS_BLOCK_GROUP_METADATA) |
321 | factor = 9; | |
be744175 | 322 | |
6324fbf3 | 323 | bit = block_group_state_bits(data); |
be744175 | 324 | |
c31f8830 | 325 | if (search_start && search_start < total_fs_bytes) { |
be744175 | 326 | struct btrfs_block_group_cache *shint; |
5276aeda | 327 | shint = btrfs_lookup_block_group(info, search_start); |
8f18cf13 | 328 | if (shint && block_group_bits(shint, data) && !shint->ro) { |
be744175 | 329 | used = btrfs_block_group_used(&shint->item); |
324ae4df Y |
330 | if (used + shint->pinned < |
331 | div_factor(shint->key.offset, factor)) { | |
be744175 CM |
332 | return shint; |
333 | } | |
334 | } | |
335 | } | |
8f18cf13 | 336 | if (hint && !hint->ro && block_group_bits(hint, data) && |
0b86a832 | 337 | hint->key.objectid < total_fs_bytes) { |
31f3c99b | 338 | used = btrfs_block_group_used(&hint->item); |
324ae4df Y |
339 | if (used + hint->pinned < |
340 | div_factor(hint->key.offset, factor)) { | |
31f3c99b CM |
341 | return hint; |
342 | } | |
e19caa5f | 343 | last = hint->key.objectid + hint->key.offset; |
31f3c99b CM |
344 | hint_last = last; |
345 | } else { | |
e37c9e69 CM |
346 | if (hint) |
347 | hint_last = max(hint->key.objectid, search_start); | |
348 | else | |
349 | hint_last = search_start; | |
350 | ||
c31f8830 CM |
351 | if (hint_last >= total_fs_bytes) |
352 | hint_last = search_start; | |
e37c9e69 | 353 | last = hint_last; |
31f3c99b | 354 | } |
31f3c99b | 355 | again: |
cd1bc465 | 356 | while(1) { |
96b5179d CM |
357 | ret = find_first_extent_bit(block_group_cache, last, |
358 | &start, &end, bit); | |
359 | if (ret) | |
cd1bc465 | 360 | break; |
96b5179d CM |
361 | |
362 | ret = get_state_private(block_group_cache, start, &ptr); | |
363 | if (ret) | |
364 | break; | |
365 | ||
ae2f5411 | 366 | cache = (struct btrfs_block_group_cache *)(unsigned long)ptr; |
96b5179d CM |
367 | last = cache->key.objectid + cache->key.offset; |
368 | used = btrfs_block_group_used(&cache->item); | |
369 | ||
c31f8830 CM |
370 | if (cache->key.objectid > total_fs_bytes) |
371 | break; | |
372 | ||
8f18cf13 | 373 | if (!cache->ro && block_group_bits(cache, data)) { |
8790d502 CM |
374 | if (full_search) |
375 | free_check = cache->key.offset; | |
376 | else | |
377 | free_check = div_factor(cache->key.offset, | |
378 | factor); | |
6324fbf3 | 379 | |
8790d502 CM |
380 | if (used + cache->pinned < free_check) { |
381 | found_group = cache; | |
382 | goto found; | |
383 | } | |
6324fbf3 | 384 | } |
de428b63 | 385 | cond_resched(); |
cd1bc465 | 386 | } |
31f3c99b | 387 | if (!full_search) { |
be744175 | 388 | last = search_start; |
31f3c99b CM |
389 | full_search = 1; |
390 | goto again; | |
391 | } | |
be744175 | 392 | found: |
31f3c99b | 393 | return found_group; |
cd1bc465 CM |
394 | } |
395 | ||
7bb86316 | 396 | static u64 hash_extent_ref(u64 root_objectid, u64 ref_generation, |
74493f7a CM |
397 | u64 owner, u64 owner_offset) |
398 | { | |
399 | u32 high_crc = ~(u32)0; | |
400 | u32 low_crc = ~(u32)0; | |
401 | __le64 lenum; | |
74493f7a | 402 | lenum = cpu_to_le64(root_objectid); |
a5eb62e3 | 403 | high_crc = btrfs_crc32c(high_crc, &lenum, sizeof(lenum)); |
7bb86316 | 404 | lenum = cpu_to_le64(ref_generation); |
a5eb62e3 | 405 | low_crc = btrfs_crc32c(low_crc, &lenum, sizeof(lenum)); |
21a4989d CM |
406 | if (owner >= BTRFS_FIRST_FREE_OBJECTID) { |
407 | lenum = cpu_to_le64(owner); | |
a5eb62e3 | 408 | low_crc = btrfs_crc32c(low_crc, &lenum, sizeof(lenum)); |
21a4989d | 409 | lenum = cpu_to_le64(owner_offset); |
a5eb62e3 | 410 | low_crc = btrfs_crc32c(low_crc, &lenum, sizeof(lenum)); |
21a4989d | 411 | } |
74493f7a CM |
412 | return ((u64)high_crc << 32) | (u64)low_crc; |
413 | } | |
414 | ||
7bb86316 CM |
415 | static int match_extent_ref(struct extent_buffer *leaf, |
416 | struct btrfs_extent_ref *disk_ref, | |
417 | struct btrfs_extent_ref *cpu_ref) | |
418 | { | |
419 | int ret; | |
420 | int len; | |
421 | ||
422 | if (cpu_ref->objectid) | |
423 | len = sizeof(*cpu_ref); | |
424 | else | |
425 | len = 2 * sizeof(u64); | |
426 | ret = memcmp_extent_buffer(leaf, cpu_ref, (unsigned long)disk_ref, | |
427 | len); | |
428 | return ret == 0; | |
429 | } | |
430 | ||
98ed5174 CM |
431 | static int noinline lookup_extent_backref(struct btrfs_trans_handle *trans, |
432 | struct btrfs_root *root, | |
433 | struct btrfs_path *path, u64 bytenr, | |
434 | u64 root_objectid, | |
435 | u64 ref_generation, u64 owner, | |
436 | u64 owner_offset, int del) | |
74493f7a CM |
437 | { |
438 | u64 hash; | |
439 | struct btrfs_key key; | |
7bb86316 | 440 | struct btrfs_key found_key; |
74493f7a | 441 | struct btrfs_extent_ref ref; |
7bb86316 CM |
442 | struct extent_buffer *leaf; |
443 | struct btrfs_extent_ref *disk_ref; | |
444 | int ret; | |
445 | int ret2; | |
446 | ||
447 | btrfs_set_stack_ref_root(&ref, root_objectid); | |
448 | btrfs_set_stack_ref_generation(&ref, ref_generation); | |
449 | btrfs_set_stack_ref_objectid(&ref, owner); | |
450 | btrfs_set_stack_ref_offset(&ref, owner_offset); | |
451 | ||
452 | hash = hash_extent_ref(root_objectid, ref_generation, owner, | |
453 | owner_offset); | |
454 | key.offset = hash; | |
455 | key.objectid = bytenr; | |
456 | key.type = BTRFS_EXTENT_REF_KEY; | |
457 | ||
458 | while (1) { | |
459 | ret = btrfs_search_slot(trans, root, &key, path, | |
460 | del ? -1 : 0, del); | |
461 | if (ret < 0) | |
462 | goto out; | |
463 | leaf = path->nodes[0]; | |
464 | if (ret != 0) { | |
465 | u32 nritems = btrfs_header_nritems(leaf); | |
466 | if (path->slots[0] >= nritems) { | |
467 | ret2 = btrfs_next_leaf(root, path); | |
468 | if (ret2) | |
469 | goto out; | |
470 | leaf = path->nodes[0]; | |
471 | } | |
472 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); | |
473 | if (found_key.objectid != bytenr || | |
474 | found_key.type != BTRFS_EXTENT_REF_KEY) | |
475 | goto out; | |
476 | key.offset = found_key.offset; | |
477 | if (del) { | |
478 | btrfs_release_path(root, path); | |
479 | continue; | |
480 | } | |
481 | } | |
482 | disk_ref = btrfs_item_ptr(path->nodes[0], | |
483 | path->slots[0], | |
484 | struct btrfs_extent_ref); | |
485 | if (match_extent_ref(path->nodes[0], disk_ref, &ref)) { | |
486 | ret = 0; | |
487 | goto out; | |
488 | } | |
489 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); | |
490 | key.offset = found_key.offset + 1; | |
491 | btrfs_release_path(root, path); | |
492 | } | |
493 | out: | |
494 | return ret; | |
495 | } | |
496 | ||
d8d5f3e1 CM |
497 | /* |
498 | * Back reference rules. Back refs have three main goals: | |
499 | * | |
500 | * 1) differentiate between all holders of references to an extent so that | |
501 | * when a reference is dropped we can make sure it was a valid reference | |
502 | * before freeing the extent. | |
503 | * | |
504 | * 2) Provide enough information to quickly find the holders of an extent | |
505 | * if we notice a given block is corrupted or bad. | |
506 | * | |
507 | * 3) Make it easy to migrate blocks for FS shrinking or storage pool | |
508 | * maintenance. This is actually the same as #2, but with a slightly | |
509 | * different use case. | |
510 | * | |
511 | * File extents can be referenced by: | |
512 | * | |
513 | * - multiple snapshots, subvolumes, or different generations in one subvol | |
514 | * - different files inside a single subvolume (in theory, not implemented yet) | |
515 | * - different offsets inside a file (bookend extents in file.c) | |
516 | * | |
517 | * The extent ref structure has fields for: | |
518 | * | |
519 | * - Objectid of the subvolume root | |
520 | * - Generation number of the tree holding the reference | |
521 | * - objectid of the file holding the reference | |
522 | * - offset in the file corresponding to the key holding the reference | |
523 | * | |
524 | * When a file extent is allocated the fields are filled in: | |
525 | * (root_key.objectid, trans->transid, inode objectid, offset in file) | |
526 | * | |
527 | * When a leaf is cow'd new references are added for every file extent found | |
528 | * in the leaf. It looks the same as the create case, but trans->transid | |
529 | * will be different when the block is cow'd. | |
530 | * | |
531 | * (root_key.objectid, trans->transid, inode objectid, offset in file) | |
532 | * | |
533 | * When a file extent is removed either during snapshot deletion or file | |
534 | * truncation, the corresponding back reference is found | |
535 | * by searching for: | |
536 | * | |
537 | * (btrfs_header_owner(leaf), btrfs_header_generation(leaf), | |
538 | * inode objectid, offset in file) | |
539 | * | |
540 | * Btree extents can be referenced by: | |
541 | * | |
542 | * - Different subvolumes | |
543 | * - Different generations of the same subvolume | |
544 | * | |
545 | * Storing sufficient information for a full reverse mapping of a btree | |
546 | * block would require storing the lowest key of the block in the backref, | |
547 | * and it would require updating that lowest key either before write out or | |
548 | * every time it changed. Instead, the objectid of the lowest key is stored | |
549 | * along with the level of the tree block. This provides a hint | |
550 | * about where in the btree the block can be found. Searches through the | |
551 | * btree only need to look for a pointer to that block, so they stop one | |
552 | * level higher than the level recorded in the backref. | |
553 | * | |
554 | * Some btrees do not do reference counting on their extents. These | |
555 | * include the extent tree and the tree of tree roots. Backrefs for these | |
556 | * trees always have a generation of zero. | |
557 | * | |
558 | * When a tree block is created, back references are inserted: | |
559 | * | |
f6dbff55 | 560 | * (root->root_key.objectid, trans->transid or zero, level, lowest_key_objectid) |
d8d5f3e1 CM |
561 | * |
562 | * When a tree block is cow'd in a reference counted root, | |
563 | * new back references are added for all the blocks it points to. | |
564 | * These are of the form (trans->transid will have increased since creation): | |
565 | * | |
f6dbff55 | 566 | * (root->root_key.objectid, trans->transid, level, lowest_key_objectid) |
d8d5f3e1 CM |
567 | * |
568 | * Because the lowest_key_objectid and the level are just hints | |
569 | * they are not used when backrefs are deleted. When a backref is deleted: | |
570 | * | |
571 | * if backref was for a tree root: | |
572 | * root_objectid = root->root_key.objectid | |
573 | * else | |
574 | * root_objectid = btrfs_header_owner(parent) | |
575 | * | |
576 | * (root_objectid, btrfs_header_generation(parent) or zero, 0, 0) | |
577 | * | |
578 | * Back Reference Key hashing: | |
579 | * | |
580 | * Back references have four fields, each 64 bits long. Unfortunately, | |
581 | * This is hashed into a single 64 bit number and placed into the key offset. | |
582 | * The key objectid corresponds to the first byte in the extent, and the | |
583 | * key type is set to BTRFS_EXTENT_REF_KEY | |
584 | */ | |
7bb86316 CM |
585 | int btrfs_insert_extent_backref(struct btrfs_trans_handle *trans, |
586 | struct btrfs_root *root, | |
587 | struct btrfs_path *path, u64 bytenr, | |
588 | u64 root_objectid, u64 ref_generation, | |
589 | u64 owner, u64 owner_offset) | |
590 | { | |
591 | u64 hash; | |
592 | struct btrfs_key key; | |
593 | struct btrfs_extent_ref ref; | |
594 | struct btrfs_extent_ref *disk_ref; | |
74493f7a CM |
595 | int ret; |
596 | ||
597 | btrfs_set_stack_ref_root(&ref, root_objectid); | |
7bb86316 | 598 | btrfs_set_stack_ref_generation(&ref, ref_generation); |
74493f7a CM |
599 | btrfs_set_stack_ref_objectid(&ref, owner); |
600 | btrfs_set_stack_ref_offset(&ref, owner_offset); | |
601 | ||
7bb86316 CM |
602 | hash = hash_extent_ref(root_objectid, ref_generation, owner, |
603 | owner_offset); | |
74493f7a CM |
604 | key.offset = hash; |
605 | key.objectid = bytenr; | |
606 | key.type = BTRFS_EXTENT_REF_KEY; | |
607 | ||
608 | ret = btrfs_insert_empty_item(trans, root, path, &key, sizeof(ref)); | |
609 | while (ret == -EEXIST) { | |
7bb86316 CM |
610 | disk_ref = btrfs_item_ptr(path->nodes[0], path->slots[0], |
611 | struct btrfs_extent_ref); | |
612 | if (match_extent_ref(path->nodes[0], disk_ref, &ref)) | |
613 | goto out; | |
614 | key.offset++; | |
615 | btrfs_release_path(root, path); | |
616 | ret = btrfs_insert_empty_item(trans, root, path, &key, | |
617 | sizeof(ref)); | |
74493f7a | 618 | } |
7bb86316 CM |
619 | if (ret) |
620 | goto out; | |
621 | disk_ref = btrfs_item_ptr(path->nodes[0], path->slots[0], | |
622 | struct btrfs_extent_ref); | |
623 | write_extent_buffer(path->nodes[0], &ref, (unsigned long)disk_ref, | |
624 | sizeof(ref)); | |
625 | btrfs_mark_buffer_dirty(path->nodes[0]); | |
626 | out: | |
627 | btrfs_release_path(root, path); | |
628 | return ret; | |
74493f7a CM |
629 | } |
630 | ||
b18c6685 CM |
631 | int btrfs_inc_extent_ref(struct btrfs_trans_handle *trans, |
632 | struct btrfs_root *root, | |
74493f7a | 633 | u64 bytenr, u64 num_bytes, |
7bb86316 | 634 | u64 root_objectid, u64 ref_generation, |
74493f7a | 635 | u64 owner, u64 owner_offset) |
02217ed2 | 636 | { |
5caf2a00 | 637 | struct btrfs_path *path; |
02217ed2 | 638 | int ret; |
e2fa7227 | 639 | struct btrfs_key key; |
5f39d397 | 640 | struct extent_buffer *l; |
234b63a0 | 641 | struct btrfs_extent_item *item; |
cf27e1ee | 642 | u32 refs; |
037e6390 | 643 | |
db94535d | 644 | WARN_ON(num_bytes < root->sectorsize); |
5caf2a00 | 645 | path = btrfs_alloc_path(); |
54aa1f4d CM |
646 | if (!path) |
647 | return -ENOMEM; | |
26b8003f | 648 | |
3c12ac72 | 649 | path->reada = 1; |
db94535d | 650 | key.objectid = bytenr; |
62e2749e | 651 | btrfs_set_key_type(&key, BTRFS_EXTENT_ITEM_KEY); |
db94535d | 652 | key.offset = num_bytes; |
5caf2a00 | 653 | ret = btrfs_search_slot(trans, root->fs_info->extent_root, &key, path, |
9f5fae2f | 654 | 0, 1); |
54aa1f4d CM |
655 | if (ret < 0) |
656 | return ret; | |
a429e513 | 657 | if (ret != 0) { |
a28ec197 | 658 | BUG(); |
a429e513 | 659 | } |
02217ed2 | 660 | BUG_ON(ret != 0); |
5f39d397 | 661 | l = path->nodes[0]; |
5caf2a00 | 662 | item = btrfs_item_ptr(l, path->slots[0], struct btrfs_extent_item); |
5f39d397 CM |
663 | refs = btrfs_extent_refs(l, item); |
664 | btrfs_set_extent_refs(l, item, refs + 1); | |
5caf2a00 | 665 | btrfs_mark_buffer_dirty(path->nodes[0]); |
a28ec197 | 666 | |
5caf2a00 | 667 | btrfs_release_path(root->fs_info->extent_root, path); |
7bb86316 | 668 | |
3c12ac72 | 669 | path->reada = 1; |
7bb86316 CM |
670 | ret = btrfs_insert_extent_backref(trans, root->fs_info->extent_root, |
671 | path, bytenr, root_objectid, | |
672 | ref_generation, owner, owner_offset); | |
673 | BUG_ON(ret); | |
9f5fae2f | 674 | finish_current_insert(trans, root->fs_info->extent_root); |
e20d96d6 | 675 | del_pending_extents(trans, root->fs_info->extent_root); |
74493f7a CM |
676 | |
677 | btrfs_free_path(path); | |
02217ed2 CM |
678 | return 0; |
679 | } | |
680 | ||
e9d0b13b CM |
681 | int btrfs_extent_post_op(struct btrfs_trans_handle *trans, |
682 | struct btrfs_root *root) | |
683 | { | |
684 | finish_current_insert(trans, root->fs_info->extent_root); | |
685 | del_pending_extents(trans, root->fs_info->extent_root); | |
686 | return 0; | |
687 | } | |
688 | ||
b18c6685 | 689 | static int lookup_extent_ref(struct btrfs_trans_handle *trans, |
db94535d CM |
690 | struct btrfs_root *root, u64 bytenr, |
691 | u64 num_bytes, u32 *refs) | |
a28ec197 | 692 | { |
5caf2a00 | 693 | struct btrfs_path *path; |
a28ec197 | 694 | int ret; |
e2fa7227 | 695 | struct btrfs_key key; |
5f39d397 | 696 | struct extent_buffer *l; |
234b63a0 | 697 | struct btrfs_extent_item *item; |
5caf2a00 | 698 | |
db94535d | 699 | WARN_ON(num_bytes < root->sectorsize); |
5caf2a00 | 700 | path = btrfs_alloc_path(); |
3c12ac72 | 701 | path->reada = 1; |
db94535d CM |
702 | key.objectid = bytenr; |
703 | key.offset = num_bytes; | |
62e2749e | 704 | btrfs_set_key_type(&key, BTRFS_EXTENT_ITEM_KEY); |
5caf2a00 | 705 | ret = btrfs_search_slot(trans, root->fs_info->extent_root, &key, path, |
9f5fae2f | 706 | 0, 0); |
54aa1f4d CM |
707 | if (ret < 0) |
708 | goto out; | |
5f39d397 CM |
709 | if (ret != 0) { |
710 | btrfs_print_leaf(root, path->nodes[0]); | |
db94535d | 711 | printk("failed to find block number %Lu\n", bytenr); |
a28ec197 | 712 | BUG(); |
5f39d397 CM |
713 | } |
714 | l = path->nodes[0]; | |
5caf2a00 | 715 | item = btrfs_item_ptr(l, path->slots[0], struct btrfs_extent_item); |
5f39d397 | 716 | *refs = btrfs_extent_refs(l, item); |
54aa1f4d | 717 | out: |
5caf2a00 | 718 | btrfs_free_path(path); |
a28ec197 CM |
719 | return 0; |
720 | } | |
721 | ||
be20aa9d CM |
722 | u32 btrfs_count_snapshots_in_path(struct btrfs_root *root, |
723 | struct btrfs_path *count_path, | |
724 | u64 first_extent) | |
725 | { | |
726 | struct btrfs_root *extent_root = root->fs_info->extent_root; | |
727 | struct btrfs_path *path; | |
728 | u64 bytenr; | |
729 | u64 found_objectid; | |
56b453c9 | 730 | u64 root_objectid = root->root_key.objectid; |
be20aa9d CM |
731 | u32 total_count = 0; |
732 | u32 cur_count; | |
be20aa9d CM |
733 | u32 nritems; |
734 | int ret; | |
735 | struct btrfs_key key; | |
736 | struct btrfs_key found_key; | |
737 | struct extent_buffer *l; | |
738 | struct btrfs_extent_item *item; | |
739 | struct btrfs_extent_ref *ref_item; | |
740 | int level = -1; | |
741 | ||
742 | path = btrfs_alloc_path(); | |
743 | again: | |
744 | if (level == -1) | |
745 | bytenr = first_extent; | |
746 | else | |
747 | bytenr = count_path->nodes[level]->start; | |
748 | ||
749 | cur_count = 0; | |
750 | key.objectid = bytenr; | |
751 | key.offset = 0; | |
752 | ||
753 | btrfs_set_key_type(&key, BTRFS_EXTENT_ITEM_KEY); | |
754 | ret = btrfs_search_slot(NULL, extent_root, &key, path, 0, 0); | |
755 | if (ret < 0) | |
756 | goto out; | |
757 | BUG_ON(ret == 0); | |
758 | ||
759 | l = path->nodes[0]; | |
760 | btrfs_item_key_to_cpu(l, &found_key, path->slots[0]); | |
761 | ||
762 | if (found_key.objectid != bytenr || | |
763 | found_key.type != BTRFS_EXTENT_ITEM_KEY) { | |
764 | goto out; | |
765 | } | |
766 | ||
767 | item = btrfs_item_ptr(l, path->slots[0], struct btrfs_extent_item); | |
be20aa9d | 768 | while (1) { |
bd09835d | 769 | l = path->nodes[0]; |
be20aa9d CM |
770 | nritems = btrfs_header_nritems(l); |
771 | if (path->slots[0] >= nritems) { | |
772 | ret = btrfs_next_leaf(extent_root, path); | |
773 | if (ret == 0) | |
774 | continue; | |
775 | break; | |
776 | } | |
777 | btrfs_item_key_to_cpu(l, &found_key, path->slots[0]); | |
778 | if (found_key.objectid != bytenr) | |
779 | break; | |
bd09835d | 780 | |
be20aa9d CM |
781 | if (found_key.type != BTRFS_EXTENT_REF_KEY) { |
782 | path->slots[0]++; | |
783 | continue; | |
784 | } | |
785 | ||
786 | cur_count++; | |
787 | ref_item = btrfs_item_ptr(l, path->slots[0], | |
788 | struct btrfs_extent_ref); | |
789 | found_objectid = btrfs_ref_root(l, ref_item); | |
790 | ||
56b453c9 CM |
791 | if (found_objectid != root_objectid) { |
792 | total_count = 2; | |
4313b399 | 793 | goto out; |
56b453c9 CM |
794 | } |
795 | total_count = 1; | |
be20aa9d CM |
796 | path->slots[0]++; |
797 | } | |
798 | if (cur_count == 0) { | |
799 | total_count = 0; | |
800 | goto out; | |
801 | } | |
be20aa9d CM |
802 | if (level >= 0 && root->node == count_path->nodes[level]) |
803 | goto out; | |
804 | level++; | |
805 | btrfs_release_path(root, path); | |
806 | goto again; | |
807 | ||
808 | out: | |
809 | btrfs_free_path(path); | |
810 | return total_count; | |
be20aa9d | 811 | } |
c5739bba | 812 | int btrfs_inc_root_ref(struct btrfs_trans_handle *trans, |
7bb86316 | 813 | struct btrfs_root *root, u64 owner_objectid) |
c5739bba | 814 | { |
7bb86316 CM |
815 | u64 generation; |
816 | u64 key_objectid; | |
817 | u64 level; | |
818 | u32 nritems; | |
819 | struct btrfs_disk_key disk_key; | |
820 | ||
821 | level = btrfs_header_level(root->node); | |
822 | generation = trans->transid; | |
823 | nritems = btrfs_header_nritems(root->node); | |
824 | if (nritems > 0) { | |
825 | if (level == 0) | |
826 | btrfs_item_key(root->node, &disk_key, 0); | |
827 | else | |
828 | btrfs_node_key(root->node, &disk_key, 0); | |
829 | key_objectid = btrfs_disk_key_objectid(&disk_key); | |
830 | } else { | |
831 | key_objectid = 0; | |
832 | } | |
db94535d | 833 | return btrfs_inc_extent_ref(trans, root, root->node->start, |
7bb86316 | 834 | root->node->len, owner_objectid, |
f6dbff55 | 835 | generation, level, key_objectid); |
c5739bba CM |
836 | } |
837 | ||
e089f05c | 838 | int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root, |
5f39d397 | 839 | struct extent_buffer *buf) |
02217ed2 | 840 | { |
db94535d | 841 | u64 bytenr; |
5f39d397 CM |
842 | u32 nritems; |
843 | struct btrfs_key key; | |
6407bf6d | 844 | struct btrfs_file_extent_item *fi; |
02217ed2 | 845 | int i; |
db94535d | 846 | int level; |
6407bf6d | 847 | int ret; |
54aa1f4d | 848 | int faili; |
a28ec197 | 849 | |
3768f368 | 850 | if (!root->ref_cows) |
a28ec197 | 851 | return 0; |
5f39d397 | 852 | |
db94535d | 853 | level = btrfs_header_level(buf); |
5f39d397 CM |
854 | nritems = btrfs_header_nritems(buf); |
855 | for (i = 0; i < nritems; i++) { | |
db94535d CM |
856 | if (level == 0) { |
857 | u64 disk_bytenr; | |
5f39d397 CM |
858 | btrfs_item_key_to_cpu(buf, &key, i); |
859 | if (btrfs_key_type(&key) != BTRFS_EXTENT_DATA_KEY) | |
6407bf6d | 860 | continue; |
5f39d397 | 861 | fi = btrfs_item_ptr(buf, i, |
6407bf6d | 862 | struct btrfs_file_extent_item); |
5f39d397 | 863 | if (btrfs_file_extent_type(buf, fi) == |
236454df CM |
864 | BTRFS_FILE_EXTENT_INLINE) |
865 | continue; | |
db94535d CM |
866 | disk_bytenr = btrfs_file_extent_disk_bytenr(buf, fi); |
867 | if (disk_bytenr == 0) | |
3a686375 | 868 | continue; |
db94535d | 869 | ret = btrfs_inc_extent_ref(trans, root, disk_bytenr, |
7bb86316 CM |
870 | btrfs_file_extent_disk_num_bytes(buf, fi), |
871 | root->root_key.objectid, trans->transid, | |
872 | key.objectid, key.offset); | |
54aa1f4d CM |
873 | if (ret) { |
874 | faili = i; | |
875 | goto fail; | |
876 | } | |
6407bf6d | 877 | } else { |
db94535d | 878 | bytenr = btrfs_node_blockptr(buf, i); |
6caab489 | 879 | btrfs_node_key_to_cpu(buf, &key, i); |
db94535d | 880 | ret = btrfs_inc_extent_ref(trans, root, bytenr, |
7bb86316 CM |
881 | btrfs_level_size(root, level - 1), |
882 | root->root_key.objectid, | |
f6dbff55 CM |
883 | trans->transid, |
884 | level - 1, key.objectid); | |
54aa1f4d CM |
885 | if (ret) { |
886 | faili = i; | |
887 | goto fail; | |
888 | } | |
6407bf6d | 889 | } |
02217ed2 CM |
890 | } |
891 | return 0; | |
54aa1f4d | 892 | fail: |
ccd467d6 | 893 | WARN_ON(1); |
7bb86316 | 894 | #if 0 |
54aa1f4d | 895 | for (i =0; i < faili; i++) { |
db94535d CM |
896 | if (level == 0) { |
897 | u64 disk_bytenr; | |
5f39d397 CM |
898 | btrfs_item_key_to_cpu(buf, &key, i); |
899 | if (btrfs_key_type(&key) != BTRFS_EXTENT_DATA_KEY) | |
54aa1f4d | 900 | continue; |
5f39d397 | 901 | fi = btrfs_item_ptr(buf, i, |
54aa1f4d | 902 | struct btrfs_file_extent_item); |
5f39d397 | 903 | if (btrfs_file_extent_type(buf, fi) == |
54aa1f4d CM |
904 | BTRFS_FILE_EXTENT_INLINE) |
905 | continue; | |
db94535d CM |
906 | disk_bytenr = btrfs_file_extent_disk_bytenr(buf, fi); |
907 | if (disk_bytenr == 0) | |
54aa1f4d | 908 | continue; |
db94535d CM |
909 | err = btrfs_free_extent(trans, root, disk_bytenr, |
910 | btrfs_file_extent_disk_num_bytes(buf, | |
5f39d397 | 911 | fi), 0); |
54aa1f4d CM |
912 | BUG_ON(err); |
913 | } else { | |
db94535d CM |
914 | bytenr = btrfs_node_blockptr(buf, i); |
915 | err = btrfs_free_extent(trans, root, bytenr, | |
916 | btrfs_level_size(root, level - 1), 0); | |
54aa1f4d CM |
917 | BUG_ON(err); |
918 | } | |
919 | } | |
7bb86316 | 920 | #endif |
54aa1f4d | 921 | return ret; |
02217ed2 CM |
922 | } |
923 | ||
9078a3e1 CM |
924 | static int write_one_cache_group(struct btrfs_trans_handle *trans, |
925 | struct btrfs_root *root, | |
926 | struct btrfs_path *path, | |
927 | struct btrfs_block_group_cache *cache) | |
928 | { | |
929 | int ret; | |
930 | int pending_ret; | |
931 | struct btrfs_root *extent_root = root->fs_info->extent_root; | |
5f39d397 CM |
932 | unsigned long bi; |
933 | struct extent_buffer *leaf; | |
9078a3e1 | 934 | |
9078a3e1 | 935 | ret = btrfs_search_slot(trans, extent_root, &cache->key, path, 0, 1); |
54aa1f4d CM |
936 | if (ret < 0) |
937 | goto fail; | |
9078a3e1 | 938 | BUG_ON(ret); |
5f39d397 CM |
939 | |
940 | leaf = path->nodes[0]; | |
941 | bi = btrfs_item_ptr_offset(leaf, path->slots[0]); | |
942 | write_extent_buffer(leaf, &cache->item, bi, sizeof(cache->item)); | |
943 | btrfs_mark_buffer_dirty(leaf); | |
9078a3e1 | 944 | btrfs_release_path(extent_root, path); |
54aa1f4d | 945 | fail: |
9078a3e1 CM |
946 | finish_current_insert(trans, extent_root); |
947 | pending_ret = del_pending_extents(trans, extent_root); | |
948 | if (ret) | |
949 | return ret; | |
950 | if (pending_ret) | |
951 | return pending_ret; | |
952 | return 0; | |
953 | ||
954 | } | |
955 | ||
96b5179d CM |
956 | int btrfs_write_dirty_block_groups(struct btrfs_trans_handle *trans, |
957 | struct btrfs_root *root) | |
9078a3e1 | 958 | { |
d1310b2e | 959 | struct extent_io_tree *block_group_cache; |
96b5179d | 960 | struct btrfs_block_group_cache *cache; |
9078a3e1 CM |
961 | int ret; |
962 | int err = 0; | |
963 | int werr = 0; | |
9078a3e1 | 964 | struct btrfs_path *path; |
96b5179d CM |
965 | u64 last = 0; |
966 | u64 start; | |
967 | u64 end; | |
968 | u64 ptr; | |
9078a3e1 | 969 | |
96b5179d | 970 | block_group_cache = &root->fs_info->block_group_cache; |
9078a3e1 CM |
971 | path = btrfs_alloc_path(); |
972 | if (!path) | |
973 | return -ENOMEM; | |
974 | ||
975 | while(1) { | |
96b5179d CM |
976 | ret = find_first_extent_bit(block_group_cache, last, |
977 | &start, &end, BLOCK_GROUP_DIRTY); | |
978 | if (ret) | |
9078a3e1 | 979 | break; |
54aa1f4d | 980 | |
96b5179d CM |
981 | last = end + 1; |
982 | ret = get_state_private(block_group_cache, start, &ptr); | |
983 | if (ret) | |
984 | break; | |
ae2f5411 | 985 | cache = (struct btrfs_block_group_cache *)(unsigned long)ptr; |
96b5179d CM |
986 | err = write_one_cache_group(trans, root, |
987 | path, cache); | |
988 | /* | |
989 | * if we fail to write the cache group, we want | |
990 | * to keep it marked dirty in hopes that a later | |
991 | * write will work | |
992 | */ | |
993 | if (err) { | |
994 | werr = err; | |
995 | continue; | |
9078a3e1 | 996 | } |
96b5179d CM |
997 | clear_extent_bits(block_group_cache, start, end, |
998 | BLOCK_GROUP_DIRTY, GFP_NOFS); | |
9078a3e1 CM |
999 | } |
1000 | btrfs_free_path(path); | |
1001 | return werr; | |
1002 | } | |
1003 | ||
6324fbf3 CM |
1004 | static struct btrfs_space_info *__find_space_info(struct btrfs_fs_info *info, |
1005 | u64 flags) | |
1006 | { | |
1007 | struct list_head *head = &info->space_info; | |
1008 | struct list_head *cur; | |
1009 | struct btrfs_space_info *found; | |
1010 | list_for_each(cur, head) { | |
1011 | found = list_entry(cur, struct btrfs_space_info, list); | |
1012 | if (found->flags == flags) | |
1013 | return found; | |
1014 | } | |
1015 | return NULL; | |
1016 | ||
1017 | } | |
1018 | ||
593060d7 CM |
1019 | static int update_space_info(struct btrfs_fs_info *info, u64 flags, |
1020 | u64 total_bytes, u64 bytes_used, | |
1021 | struct btrfs_space_info **space_info) | |
1022 | { | |
1023 | struct btrfs_space_info *found; | |
1024 | ||
1025 | found = __find_space_info(info, flags); | |
1026 | if (found) { | |
1027 | found->total_bytes += total_bytes; | |
1028 | found->bytes_used += bytes_used; | |
8f18cf13 | 1029 | found->full = 0; |
593060d7 CM |
1030 | WARN_ON(found->total_bytes < found->bytes_used); |
1031 | *space_info = found; | |
1032 | return 0; | |
1033 | } | |
1034 | found = kmalloc(sizeof(*found), GFP_NOFS); | |
1035 | if (!found) | |
1036 | return -ENOMEM; | |
1037 | ||
1038 | list_add(&found->list, &info->space_info); | |
1039 | found->flags = flags; | |
1040 | found->total_bytes = total_bytes; | |
1041 | found->bytes_used = bytes_used; | |
1042 | found->bytes_pinned = 0; | |
1043 | found->full = 0; | |
1044 | *space_info = found; | |
1045 | return 0; | |
1046 | } | |
1047 | ||
8790d502 CM |
1048 | static void set_avail_alloc_bits(struct btrfs_fs_info *fs_info, u64 flags) |
1049 | { | |
1050 | u64 extra_flags = flags & (BTRFS_BLOCK_GROUP_RAID0 | | |
611f0e00 | 1051 | BTRFS_BLOCK_GROUP_RAID1 | |
321aecc6 | 1052 | BTRFS_BLOCK_GROUP_RAID10 | |
611f0e00 | 1053 | BTRFS_BLOCK_GROUP_DUP); |
8790d502 CM |
1054 | if (extra_flags) { |
1055 | if (flags & BTRFS_BLOCK_GROUP_DATA) | |
1056 | fs_info->avail_data_alloc_bits |= extra_flags; | |
1057 | if (flags & BTRFS_BLOCK_GROUP_METADATA) | |
1058 | fs_info->avail_metadata_alloc_bits |= extra_flags; | |
1059 | if (flags & BTRFS_BLOCK_GROUP_SYSTEM) | |
1060 | fs_info->avail_system_alloc_bits |= extra_flags; | |
1061 | } | |
1062 | } | |
593060d7 | 1063 | |
a061fc8d | 1064 | static u64 reduce_alloc_profile(struct btrfs_root *root, u64 flags) |
ec44a35c | 1065 | { |
a061fc8d CM |
1066 | u64 num_devices = root->fs_info->fs_devices->num_devices; |
1067 | ||
1068 | if (num_devices == 1) | |
1069 | flags &= ~(BTRFS_BLOCK_GROUP_RAID1 | BTRFS_BLOCK_GROUP_RAID0); | |
1070 | if (num_devices < 4) | |
1071 | flags &= ~BTRFS_BLOCK_GROUP_RAID10; | |
1072 | ||
ec44a35c CM |
1073 | if ((flags & BTRFS_BLOCK_GROUP_DUP) && |
1074 | (flags & (BTRFS_BLOCK_GROUP_RAID1 | | |
a061fc8d | 1075 | BTRFS_BLOCK_GROUP_RAID10))) { |
ec44a35c | 1076 | flags &= ~BTRFS_BLOCK_GROUP_DUP; |
a061fc8d | 1077 | } |
ec44a35c CM |
1078 | |
1079 | if ((flags & BTRFS_BLOCK_GROUP_RAID1) && | |
a061fc8d | 1080 | (flags & BTRFS_BLOCK_GROUP_RAID10)) { |
ec44a35c | 1081 | flags &= ~BTRFS_BLOCK_GROUP_RAID1; |
a061fc8d | 1082 | } |
ec44a35c CM |
1083 | |
1084 | if ((flags & BTRFS_BLOCK_GROUP_RAID0) && | |
1085 | ((flags & BTRFS_BLOCK_GROUP_RAID1) | | |
1086 | (flags & BTRFS_BLOCK_GROUP_RAID10) | | |
1087 | (flags & BTRFS_BLOCK_GROUP_DUP))) | |
1088 | flags &= ~BTRFS_BLOCK_GROUP_RAID0; | |
1089 | return flags; | |
1090 | } | |
1091 | ||
6324fbf3 CM |
1092 | static int do_chunk_alloc(struct btrfs_trans_handle *trans, |
1093 | struct btrfs_root *extent_root, u64 alloc_bytes, | |
1094 | u64 flags) | |
1095 | { | |
1096 | struct btrfs_space_info *space_info; | |
1097 | u64 thresh; | |
1098 | u64 start; | |
1099 | u64 num_bytes; | |
1100 | int ret; | |
1101 | ||
a061fc8d | 1102 | flags = reduce_alloc_profile(extent_root, flags); |
ec44a35c | 1103 | |
6324fbf3 | 1104 | space_info = __find_space_info(extent_root->fs_info, flags); |
593060d7 CM |
1105 | if (!space_info) { |
1106 | ret = update_space_info(extent_root->fs_info, flags, | |
1107 | 0, 0, &space_info); | |
1108 | BUG_ON(ret); | |
1109 | } | |
6324fbf3 CM |
1110 | BUG_ON(!space_info); |
1111 | ||
1112 | if (space_info->full) | |
1113 | return 0; | |
1114 | ||
8790d502 | 1115 | thresh = div_factor(space_info->total_bytes, 6); |
6324fbf3 CM |
1116 | if ((space_info->bytes_used + space_info->bytes_pinned + alloc_bytes) < |
1117 | thresh) | |
1118 | return 0; | |
1119 | ||
1120 | ret = btrfs_alloc_chunk(trans, extent_root, &start, &num_bytes, flags); | |
1121 | if (ret == -ENOSPC) { | |
1122 | printk("space info full %Lu\n", flags); | |
1123 | space_info->full = 1; | |
1124 | return 0; | |
1125 | } | |
1126 | ||
1127 | BUG_ON(ret); | |
1128 | ||
1129 | ret = btrfs_make_block_group(trans, extent_root, 0, flags, | |
e17cade2 | 1130 | BTRFS_FIRST_CHUNK_TREE_OBJECTID, start, num_bytes); |
6324fbf3 | 1131 | BUG_ON(ret); |
593060d7 | 1132 | |
6324fbf3 CM |
1133 | return 0; |
1134 | } | |
1135 | ||
9078a3e1 CM |
1136 | static int update_block_group(struct btrfs_trans_handle *trans, |
1137 | struct btrfs_root *root, | |
db94535d | 1138 | u64 bytenr, u64 num_bytes, int alloc, |
0b86a832 | 1139 | int mark_free) |
9078a3e1 CM |
1140 | { |
1141 | struct btrfs_block_group_cache *cache; | |
1142 | struct btrfs_fs_info *info = root->fs_info; | |
db94535d | 1143 | u64 total = num_bytes; |
9078a3e1 | 1144 | u64 old_val; |
db94535d | 1145 | u64 byte_in_group; |
96b5179d CM |
1146 | u64 start; |
1147 | u64 end; | |
3e1ad54f | 1148 | |
9078a3e1 | 1149 | while(total) { |
db94535d | 1150 | cache = btrfs_lookup_block_group(info, bytenr); |
3e1ad54f | 1151 | if (!cache) { |
9078a3e1 | 1152 | return -1; |
cd1bc465 | 1153 | } |
db94535d CM |
1154 | byte_in_group = bytenr - cache->key.objectid; |
1155 | WARN_ON(byte_in_group > cache->key.offset); | |
96b5179d CM |
1156 | start = cache->key.objectid; |
1157 | end = start + cache->key.offset - 1; | |
1158 | set_extent_bits(&info->block_group_cache, start, end, | |
1159 | BLOCK_GROUP_DIRTY, GFP_NOFS); | |
9078a3e1 CM |
1160 | |
1161 | old_val = btrfs_block_group_used(&cache->item); | |
db94535d | 1162 | num_bytes = min(total, cache->key.offset - byte_in_group); |
cd1bc465 | 1163 | if (alloc) { |
db94535d | 1164 | old_val += num_bytes; |
6324fbf3 | 1165 | cache->space_info->bytes_used += num_bytes; |
cd1bc465 | 1166 | } else { |
db94535d | 1167 | old_val -= num_bytes; |
6324fbf3 | 1168 | cache->space_info->bytes_used -= num_bytes; |
f510cfec CM |
1169 | if (mark_free) { |
1170 | set_extent_dirty(&info->free_space_cache, | |
db94535d | 1171 | bytenr, bytenr + num_bytes - 1, |
f510cfec | 1172 | GFP_NOFS); |
e37c9e69 | 1173 | } |
cd1bc465 | 1174 | } |
9078a3e1 | 1175 | btrfs_set_block_group_used(&cache->item, old_val); |
db94535d CM |
1176 | total -= num_bytes; |
1177 | bytenr += num_bytes; | |
9078a3e1 CM |
1178 | } |
1179 | return 0; | |
1180 | } | |
6324fbf3 | 1181 | |
a061fc8d CM |
1182 | static u64 first_logical_byte(struct btrfs_root *root, u64 search_start) |
1183 | { | |
1184 | u64 start; | |
1185 | u64 end; | |
1186 | int ret; | |
1187 | ret = find_first_extent_bit(&root->fs_info->block_group_cache, | |
1188 | search_start, &start, &end, | |
1189 | BLOCK_GROUP_DATA | BLOCK_GROUP_METADATA | | |
1190 | BLOCK_GROUP_SYSTEM); | |
1191 | if (ret) | |
1192 | return 0; | |
1193 | return start; | |
1194 | } | |
1195 | ||
1196 | ||
324ae4df Y |
1197 | static int update_pinned_extents(struct btrfs_root *root, |
1198 | u64 bytenr, u64 num, int pin) | |
1199 | { | |
1200 | u64 len; | |
1201 | struct btrfs_block_group_cache *cache; | |
1202 | struct btrfs_fs_info *fs_info = root->fs_info; | |
1203 | ||
1204 | if (pin) { | |
1205 | set_extent_dirty(&fs_info->pinned_extents, | |
1206 | bytenr, bytenr + num - 1, GFP_NOFS); | |
1207 | } else { | |
1208 | clear_extent_dirty(&fs_info->pinned_extents, | |
1209 | bytenr, bytenr + num - 1, GFP_NOFS); | |
1210 | } | |
1211 | while (num > 0) { | |
1212 | cache = btrfs_lookup_block_group(fs_info, bytenr); | |
a061fc8d CM |
1213 | if (!cache) { |
1214 | u64 first = first_logical_byte(root, bytenr); | |
1215 | WARN_ON(first < bytenr); | |
1216 | len = min(first - bytenr, num); | |
1217 | } else { | |
1218 | len = min(num, cache->key.offset - | |
1219 | (bytenr - cache->key.objectid)); | |
1220 | } | |
324ae4df | 1221 | if (pin) { |
a061fc8d CM |
1222 | if (cache) { |
1223 | cache->pinned += len; | |
1224 | cache->space_info->bytes_pinned += len; | |
1225 | } | |
324ae4df Y |
1226 | fs_info->total_pinned += len; |
1227 | } else { | |
a061fc8d CM |
1228 | if (cache) { |
1229 | cache->pinned -= len; | |
1230 | cache->space_info->bytes_pinned -= len; | |
1231 | } | |
324ae4df Y |
1232 | fs_info->total_pinned -= len; |
1233 | } | |
1234 | bytenr += len; | |
1235 | num -= len; | |
1236 | } | |
1237 | return 0; | |
1238 | } | |
9078a3e1 | 1239 | |
d1310b2e | 1240 | int btrfs_copy_pinned(struct btrfs_root *root, struct extent_io_tree *copy) |
ccd467d6 | 1241 | { |
ccd467d6 | 1242 | u64 last = 0; |
1a5bc167 CM |
1243 | u64 start; |
1244 | u64 end; | |
d1310b2e | 1245 | struct extent_io_tree *pinned_extents = &root->fs_info->pinned_extents; |
ccd467d6 | 1246 | int ret; |
ccd467d6 CM |
1247 | |
1248 | while(1) { | |
1a5bc167 CM |
1249 | ret = find_first_extent_bit(pinned_extents, last, |
1250 | &start, &end, EXTENT_DIRTY); | |
1251 | if (ret) | |
ccd467d6 | 1252 | break; |
1a5bc167 CM |
1253 | set_extent_dirty(copy, start, end, GFP_NOFS); |
1254 | last = end + 1; | |
ccd467d6 CM |
1255 | } |
1256 | return 0; | |
1257 | } | |
1258 | ||
1259 | int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans, | |
1260 | struct btrfs_root *root, | |
d1310b2e | 1261 | struct extent_io_tree *unpin) |
a28ec197 | 1262 | { |
1a5bc167 CM |
1263 | u64 start; |
1264 | u64 end; | |
a28ec197 | 1265 | int ret; |
d1310b2e | 1266 | struct extent_io_tree *free_space_cache; |
f510cfec | 1267 | free_space_cache = &root->fs_info->free_space_cache; |
a28ec197 CM |
1268 | |
1269 | while(1) { | |
1a5bc167 CM |
1270 | ret = find_first_extent_bit(unpin, 0, &start, &end, |
1271 | EXTENT_DIRTY); | |
1272 | if (ret) | |
a28ec197 | 1273 | break; |
324ae4df | 1274 | update_pinned_extents(root, start, end + 1 - start, 0); |
1a5bc167 CM |
1275 | clear_extent_dirty(unpin, start, end, GFP_NOFS); |
1276 | set_extent_dirty(free_space_cache, start, end, GFP_NOFS); | |
a28ec197 CM |
1277 | } |
1278 | return 0; | |
1279 | } | |
1280 | ||
98ed5174 CM |
1281 | static int finish_current_insert(struct btrfs_trans_handle *trans, |
1282 | struct btrfs_root *extent_root) | |
037e6390 | 1283 | { |
7bb86316 CM |
1284 | u64 start; |
1285 | u64 end; | |
1286 | struct btrfs_fs_info *info = extent_root->fs_info; | |
d8d5f3e1 | 1287 | struct extent_buffer *eb; |
7bb86316 | 1288 | struct btrfs_path *path; |
e2fa7227 | 1289 | struct btrfs_key ins; |
d8d5f3e1 | 1290 | struct btrfs_disk_key first; |
234b63a0 | 1291 | struct btrfs_extent_item extent_item; |
037e6390 | 1292 | int ret; |
d8d5f3e1 | 1293 | int level; |
1a5bc167 | 1294 | int err = 0; |
037e6390 | 1295 | |
5f39d397 | 1296 | btrfs_set_stack_extent_refs(&extent_item, 1); |
62e2749e | 1297 | btrfs_set_key_type(&ins, BTRFS_EXTENT_ITEM_KEY); |
7bb86316 | 1298 | path = btrfs_alloc_path(); |
037e6390 | 1299 | |
26b8003f | 1300 | while(1) { |
1a5bc167 CM |
1301 | ret = find_first_extent_bit(&info->extent_ins, 0, &start, |
1302 | &end, EXTENT_LOCKED); | |
1303 | if (ret) | |
26b8003f CM |
1304 | break; |
1305 | ||
1a5bc167 CM |
1306 | ins.objectid = start; |
1307 | ins.offset = end + 1 - start; | |
1308 | err = btrfs_insert_item(trans, extent_root, &ins, | |
1309 | &extent_item, sizeof(extent_item)); | |
1310 | clear_extent_bits(&info->extent_ins, start, end, EXTENT_LOCKED, | |
1311 | GFP_NOFS); | |
d8d5f3e1 CM |
1312 | eb = read_tree_block(extent_root, ins.objectid, ins.offset); |
1313 | level = btrfs_header_level(eb); | |
1314 | if (level == 0) { | |
1315 | btrfs_item_key(eb, &first, 0); | |
1316 | } else { | |
1317 | btrfs_node_key(eb, &first, 0); | |
1318 | } | |
7bb86316 CM |
1319 | err = btrfs_insert_extent_backref(trans, extent_root, path, |
1320 | start, extent_root->root_key.objectid, | |
f6dbff55 CM |
1321 | 0, level, |
1322 | btrfs_disk_key_objectid(&first)); | |
7bb86316 | 1323 | BUG_ON(err); |
d8d5f3e1 | 1324 | free_extent_buffer(eb); |
037e6390 | 1325 | } |
7bb86316 | 1326 | btrfs_free_path(path); |
037e6390 CM |
1327 | return 0; |
1328 | } | |
1329 | ||
db94535d CM |
1330 | static int pin_down_bytes(struct btrfs_root *root, u64 bytenr, u32 num_bytes, |
1331 | int pending) | |
e20d96d6 | 1332 | { |
1a5bc167 | 1333 | int err = 0; |
5f39d397 | 1334 | struct extent_buffer *buf; |
8ef97622 | 1335 | |
f4b9aa8d | 1336 | if (!pending) { |
db94535d | 1337 | buf = btrfs_find_tree_block(root, bytenr, num_bytes); |
5f39d397 CM |
1338 | if (buf) { |
1339 | if (btrfs_buffer_uptodate(buf)) { | |
2c90e5d6 CM |
1340 | u64 transid = |
1341 | root->fs_info->running_transaction->transid; | |
dc17ff8f CM |
1342 | u64 header_transid = |
1343 | btrfs_header_generation(buf); | |
6bc34676 CM |
1344 | if (header_transid == transid && |
1345 | !btrfs_header_flag(buf, | |
1346 | BTRFS_HEADER_FLAG_WRITTEN)) { | |
55c69072 | 1347 | clean_tree_block(NULL, root, buf); |
5f39d397 | 1348 | free_extent_buffer(buf); |
c549228f | 1349 | return 1; |
2c90e5d6 | 1350 | } |
f4b9aa8d | 1351 | } |
5f39d397 | 1352 | free_extent_buffer(buf); |
8ef97622 | 1353 | } |
324ae4df | 1354 | update_pinned_extents(root, bytenr, num_bytes, 1); |
f4b9aa8d | 1355 | } else { |
1a5bc167 | 1356 | set_extent_bits(&root->fs_info->pending_del, |
db94535d CM |
1357 | bytenr, bytenr + num_bytes - 1, |
1358 | EXTENT_LOCKED, GFP_NOFS); | |
f4b9aa8d | 1359 | } |
be744175 | 1360 | BUG_ON(err < 0); |
e20d96d6 CM |
1361 | return 0; |
1362 | } | |
1363 | ||
fec577fb | 1364 | /* |
a28ec197 | 1365 | * remove an extent from the root, returns 0 on success |
fec577fb | 1366 | */ |
e089f05c | 1367 | static int __free_extent(struct btrfs_trans_handle *trans, struct btrfs_root |
7bb86316 CM |
1368 | *root, u64 bytenr, u64 num_bytes, |
1369 | u64 root_objectid, u64 ref_generation, | |
1370 | u64 owner_objectid, u64 owner_offset, int pin, | |
e37c9e69 | 1371 | int mark_free) |
a28ec197 | 1372 | { |
5caf2a00 | 1373 | struct btrfs_path *path; |
e2fa7227 | 1374 | struct btrfs_key key; |
1261ec42 CM |
1375 | struct btrfs_fs_info *info = root->fs_info; |
1376 | struct btrfs_root *extent_root = info->extent_root; | |
5f39d397 | 1377 | struct extent_buffer *leaf; |
a28ec197 | 1378 | int ret; |
952fccac CM |
1379 | int extent_slot = 0; |
1380 | int found_extent = 0; | |
1381 | int num_to_del = 1; | |
234b63a0 | 1382 | struct btrfs_extent_item *ei; |
cf27e1ee | 1383 | u32 refs; |
037e6390 | 1384 | |
db94535d | 1385 | key.objectid = bytenr; |
62e2749e | 1386 | btrfs_set_key_type(&key, BTRFS_EXTENT_ITEM_KEY); |
db94535d | 1387 | key.offset = num_bytes; |
5caf2a00 | 1388 | path = btrfs_alloc_path(); |
54aa1f4d CM |
1389 | if (!path) |
1390 | return -ENOMEM; | |
5f26f772 | 1391 | |
3c12ac72 | 1392 | path->reada = 1; |
7bb86316 CM |
1393 | ret = lookup_extent_backref(trans, extent_root, path, |
1394 | bytenr, root_objectid, | |
1395 | ref_generation, | |
1396 | owner_objectid, owner_offset, 1); | |
1397 | if (ret == 0) { | |
952fccac CM |
1398 | struct btrfs_key found_key; |
1399 | extent_slot = path->slots[0]; | |
1400 | while(extent_slot > 0) { | |
1401 | extent_slot--; | |
1402 | btrfs_item_key_to_cpu(path->nodes[0], &found_key, | |
1403 | extent_slot); | |
1404 | if (found_key.objectid != bytenr) | |
1405 | break; | |
1406 | if (found_key.type == BTRFS_EXTENT_ITEM_KEY && | |
1407 | found_key.offset == num_bytes) { | |
1408 | found_extent = 1; | |
1409 | break; | |
1410 | } | |
1411 | if (path->slots[0] - extent_slot > 5) | |
1412 | break; | |
1413 | } | |
1414 | if (!found_extent) | |
1415 | ret = btrfs_del_item(trans, extent_root, path); | |
7bb86316 CM |
1416 | } else { |
1417 | btrfs_print_leaf(extent_root, path->nodes[0]); | |
1418 | WARN_ON(1); | |
1419 | printk("Unable to find ref byte nr %Lu root %Lu " | |
1420 | " gen %Lu owner %Lu offset %Lu\n", bytenr, | |
1421 | root_objectid, ref_generation, owner_objectid, | |
1422 | owner_offset); | |
1423 | } | |
952fccac CM |
1424 | if (!found_extent) { |
1425 | btrfs_release_path(extent_root, path); | |
1426 | ret = btrfs_search_slot(trans, extent_root, &key, path, -1, 1); | |
1427 | if (ret < 0) | |
1428 | return ret; | |
1429 | BUG_ON(ret); | |
1430 | extent_slot = path->slots[0]; | |
1431 | } | |
5f39d397 CM |
1432 | |
1433 | leaf = path->nodes[0]; | |
952fccac | 1434 | ei = btrfs_item_ptr(leaf, extent_slot, |
123abc88 | 1435 | struct btrfs_extent_item); |
5f39d397 CM |
1436 | refs = btrfs_extent_refs(leaf, ei); |
1437 | BUG_ON(refs == 0); | |
1438 | refs -= 1; | |
1439 | btrfs_set_extent_refs(leaf, ei, refs); | |
952fccac | 1440 | |
5f39d397 CM |
1441 | btrfs_mark_buffer_dirty(leaf); |
1442 | ||
952fccac CM |
1443 | if (refs == 0 && found_extent && path->slots[0] == extent_slot + 1) { |
1444 | /* if the back ref and the extent are next to each other | |
1445 | * they get deleted below in one shot | |
1446 | */ | |
1447 | path->slots[0] = extent_slot; | |
1448 | num_to_del = 2; | |
1449 | } else if (found_extent) { | |
1450 | /* otherwise delete the extent back ref */ | |
1451 | ret = btrfs_del_item(trans, extent_root, path); | |
1452 | BUG_ON(ret); | |
1453 | /* if refs are 0, we need to setup the path for deletion */ | |
1454 | if (refs == 0) { | |
1455 | btrfs_release_path(extent_root, path); | |
1456 | ret = btrfs_search_slot(trans, extent_root, &key, path, | |
1457 | -1, 1); | |
1458 | if (ret < 0) | |
1459 | return ret; | |
1460 | BUG_ON(ret); | |
1461 | } | |
1462 | } | |
1463 | ||
cf27e1ee | 1464 | if (refs == 0) { |
db94535d CM |
1465 | u64 super_used; |
1466 | u64 root_used; | |
78fae27e CM |
1467 | |
1468 | if (pin) { | |
db94535d | 1469 | ret = pin_down_bytes(root, bytenr, num_bytes, 0); |
c549228f Y |
1470 | if (ret > 0) |
1471 | mark_free = 1; | |
1472 | BUG_ON(ret < 0); | |
78fae27e CM |
1473 | } |
1474 | ||
58176a96 | 1475 | /* block accounting for super block */ |
db94535d CM |
1476 | super_used = btrfs_super_bytes_used(&info->super_copy); |
1477 | btrfs_set_super_bytes_used(&info->super_copy, | |
1478 | super_used - num_bytes); | |
58176a96 JB |
1479 | |
1480 | /* block accounting for root item */ | |
db94535d | 1481 | root_used = btrfs_root_used(&root->root_item); |
5f39d397 | 1482 | btrfs_set_root_used(&root->root_item, |
db94535d | 1483 | root_used - num_bytes); |
952fccac CM |
1484 | ret = btrfs_del_items(trans, extent_root, path, path->slots[0], |
1485 | num_to_del); | |
54aa1f4d CM |
1486 | if (ret) { |
1487 | return ret; | |
1488 | } | |
db94535d | 1489 | ret = update_block_group(trans, root, bytenr, num_bytes, 0, |
0b86a832 | 1490 | mark_free); |
9078a3e1 | 1491 | BUG_ON(ret); |
a28ec197 | 1492 | } |
5caf2a00 | 1493 | btrfs_free_path(path); |
e089f05c | 1494 | finish_current_insert(trans, extent_root); |
a28ec197 CM |
1495 | return ret; |
1496 | } | |
1497 | ||
a28ec197 CM |
1498 | /* |
1499 | * find all the blocks marked as pending in the radix tree and remove | |
1500 | * them from the extent map | |
1501 | */ | |
e089f05c CM |
1502 | static int del_pending_extents(struct btrfs_trans_handle *trans, struct |
1503 | btrfs_root *extent_root) | |
a28ec197 CM |
1504 | { |
1505 | int ret; | |
e20d96d6 | 1506 | int err = 0; |
1a5bc167 CM |
1507 | u64 start; |
1508 | u64 end; | |
d1310b2e CM |
1509 | struct extent_io_tree *pending_del; |
1510 | struct extent_io_tree *pinned_extents; | |
8ef97622 | 1511 | |
1a5bc167 CM |
1512 | pending_del = &extent_root->fs_info->pending_del; |
1513 | pinned_extents = &extent_root->fs_info->pinned_extents; | |
a28ec197 CM |
1514 | |
1515 | while(1) { | |
1a5bc167 CM |
1516 | ret = find_first_extent_bit(pending_del, 0, &start, &end, |
1517 | EXTENT_LOCKED); | |
1518 | if (ret) | |
a28ec197 | 1519 | break; |
324ae4df | 1520 | update_pinned_extents(extent_root, start, end + 1 - start, 1); |
1a5bc167 CM |
1521 | clear_extent_bits(pending_del, start, end, EXTENT_LOCKED, |
1522 | GFP_NOFS); | |
1523 | ret = __free_extent(trans, extent_root, | |
7bb86316 CM |
1524 | start, end + 1 - start, |
1525 | extent_root->root_key.objectid, | |
1526 | 0, 0, 0, 0, 0); | |
1a5bc167 CM |
1527 | if (ret) |
1528 | err = ret; | |
fec577fb | 1529 | } |
e20d96d6 | 1530 | return err; |
fec577fb CM |
1531 | } |
1532 | ||
1533 | /* | |
1534 | * remove an extent from the root, returns 0 on success | |
1535 | */ | |
e089f05c | 1536 | int btrfs_free_extent(struct btrfs_trans_handle *trans, struct btrfs_root |
7bb86316 CM |
1537 | *root, u64 bytenr, u64 num_bytes, |
1538 | u64 root_objectid, u64 ref_generation, | |
1539 | u64 owner_objectid, u64 owner_offset, int pin) | |
fec577fb | 1540 | { |
9f5fae2f | 1541 | struct btrfs_root *extent_root = root->fs_info->extent_root; |
fec577fb CM |
1542 | int pending_ret; |
1543 | int ret; | |
a28ec197 | 1544 | |
db94535d | 1545 | WARN_ON(num_bytes < root->sectorsize); |
7bb86316 CM |
1546 | if (!root->ref_cows) |
1547 | ref_generation = 0; | |
1548 | ||
fec577fb | 1549 | if (root == extent_root) { |
db94535d | 1550 | pin_down_bytes(root, bytenr, num_bytes, 1); |
fec577fb CM |
1551 | return 0; |
1552 | } | |
7bb86316 CM |
1553 | ret = __free_extent(trans, root, bytenr, num_bytes, root_objectid, |
1554 | ref_generation, owner_objectid, owner_offset, | |
1555 | pin, pin == 0); | |
e20d96d6 | 1556 | pending_ret = del_pending_extents(trans, root->fs_info->extent_root); |
fec577fb CM |
1557 | return ret ? ret : pending_ret; |
1558 | } | |
1559 | ||
87ee04eb CM |
1560 | static u64 stripe_align(struct btrfs_root *root, u64 val) |
1561 | { | |
1562 | u64 mask = ((u64)root->stripesize - 1); | |
1563 | u64 ret = (val + mask) & ~mask; | |
1564 | return ret; | |
1565 | } | |
1566 | ||
fec577fb CM |
1567 | /* |
1568 | * walks the btree of allocated extents and find a hole of a given size. | |
1569 | * The key ins is changed to record the hole: | |
1570 | * ins->objectid == block start | |
62e2749e | 1571 | * ins->flags = BTRFS_EXTENT_ITEM_KEY |
fec577fb CM |
1572 | * ins->offset == number of blocks |
1573 | * Any available blocks before search_start are skipped. | |
1574 | */ | |
98ed5174 CM |
1575 | static int noinline find_free_extent(struct btrfs_trans_handle *trans, |
1576 | struct btrfs_root *orig_root, | |
1577 | u64 num_bytes, u64 empty_size, | |
1578 | u64 search_start, u64 search_end, | |
1579 | u64 hint_byte, struct btrfs_key *ins, | |
1580 | u64 exclude_start, u64 exclude_nr, | |
1581 | int data) | |
fec577fb | 1582 | { |
87ee04eb | 1583 | int ret; |
a061fc8d | 1584 | u64 orig_search_start; |
9f5fae2f | 1585 | struct btrfs_root * root = orig_root->fs_info->extent_root; |
f2458e1d | 1586 | struct btrfs_fs_info *info = root->fs_info; |
db94535d | 1587 | u64 total_needed = num_bytes; |
239b14b3 | 1588 | u64 *last_ptr = NULL; |
be08c1b9 | 1589 | struct btrfs_block_group_cache *block_group; |
be744175 | 1590 | int full_scan = 0; |
fbdc762b | 1591 | int wrapped = 0; |
239b14b3 | 1592 | int empty_cluster = 2 * 1024 * 1024; |
fec577fb | 1593 | |
db94535d | 1594 | WARN_ON(num_bytes < root->sectorsize); |
b1a4d965 CM |
1595 | btrfs_set_key_type(ins, BTRFS_EXTENT_ITEM_KEY); |
1596 | ||
239b14b3 CM |
1597 | if (data & BTRFS_BLOCK_GROUP_METADATA) { |
1598 | last_ptr = &root->fs_info->last_alloc; | |
8790d502 | 1599 | empty_cluster = 256 * 1024; |
239b14b3 CM |
1600 | } |
1601 | ||
1602 | if ((data & BTRFS_BLOCK_GROUP_DATA) && btrfs_test_opt(root, SSD)) { | |
1603 | last_ptr = &root->fs_info->last_data_alloc; | |
1604 | } | |
1605 | ||
1606 | if (last_ptr) { | |
1607 | if (*last_ptr) | |
1608 | hint_byte = *last_ptr; | |
1609 | else { | |
1610 | empty_size += empty_cluster; | |
1611 | } | |
1612 | } | |
1613 | ||
a061fc8d CM |
1614 | search_start = max(search_start, first_logical_byte(root, 0)); |
1615 | orig_search_start = search_start; | |
1616 | ||
7f93bf8d CM |
1617 | if (search_end == (u64)-1) |
1618 | search_end = btrfs_super_total_bytes(&info->super_copy); | |
0b86a832 | 1619 | |
db94535d CM |
1620 | if (hint_byte) { |
1621 | block_group = btrfs_lookup_block_group(info, hint_byte); | |
1a2b2ac7 CM |
1622 | if (!block_group) |
1623 | hint_byte = search_start; | |
be744175 | 1624 | block_group = btrfs_find_block_group(root, block_group, |
db94535d | 1625 | hint_byte, data, 1); |
239b14b3 CM |
1626 | if (last_ptr && *last_ptr == 0 && block_group) |
1627 | hint_byte = block_group->key.objectid; | |
be744175 CM |
1628 | } else { |
1629 | block_group = btrfs_find_block_group(root, | |
1a2b2ac7 CM |
1630 | trans->block_group, |
1631 | search_start, data, 1); | |
be744175 | 1632 | } |
239b14b3 | 1633 | search_start = max(search_start, hint_byte); |
be744175 | 1634 | |
6702ed49 | 1635 | total_needed += empty_size; |
0b86a832 | 1636 | |
be744175 | 1637 | check_failed: |
70b043f0 CM |
1638 | if (!block_group) { |
1639 | block_group = btrfs_lookup_block_group(info, search_start); | |
1640 | if (!block_group) | |
1641 | block_group = btrfs_lookup_block_group(info, | |
1642 | orig_search_start); | |
1643 | } | |
0b86a832 CM |
1644 | ret = find_search_start(root, &block_group, &search_start, |
1645 | total_needed, data); | |
239b14b3 CM |
1646 | if (ret == -ENOSPC && last_ptr && *last_ptr) { |
1647 | *last_ptr = 0; | |
1648 | block_group = btrfs_lookup_block_group(info, | |
1649 | orig_search_start); | |
1650 | search_start = orig_search_start; | |
1651 | ret = find_search_start(root, &block_group, &search_start, | |
1652 | total_needed, data); | |
1653 | } | |
1654 | if (ret == -ENOSPC) | |
1655 | goto enospc; | |
0b86a832 | 1656 | if (ret) |
d548ee51 | 1657 | goto error; |
e19caa5f | 1658 | |
239b14b3 CM |
1659 | if (last_ptr && *last_ptr && search_start != *last_ptr) { |
1660 | *last_ptr = 0; | |
1661 | if (!empty_size) { | |
1662 | empty_size += empty_cluster; | |
1663 | total_needed += empty_size; | |
1664 | } | |
1665 | block_group = btrfs_lookup_block_group(info, | |
1666 | orig_search_start); | |
1667 | search_start = orig_search_start; | |
1668 | ret = find_search_start(root, &block_group, | |
1669 | &search_start, total_needed, data); | |
1670 | if (ret == -ENOSPC) | |
1671 | goto enospc; | |
1672 | if (ret) | |
1673 | goto error; | |
1674 | } | |
1675 | ||
0b86a832 CM |
1676 | search_start = stripe_align(root, search_start); |
1677 | ins->objectid = search_start; | |
1678 | ins->offset = num_bytes; | |
e37c9e69 | 1679 | |
db94535d | 1680 | if (ins->objectid + num_bytes >= search_end) |
cf67582b | 1681 | goto enospc; |
0b86a832 CM |
1682 | |
1683 | if (ins->objectid + num_bytes > | |
1684 | block_group->key.objectid + block_group->key.offset) { | |
e19caa5f CM |
1685 | search_start = block_group->key.objectid + |
1686 | block_group->key.offset; | |
1687 | goto new_group; | |
1688 | } | |
0b86a832 | 1689 | |
1a5bc167 | 1690 | if (test_range_bit(&info->extent_ins, ins->objectid, |
db94535d CM |
1691 | ins->objectid + num_bytes -1, EXTENT_LOCKED, 0)) { |
1692 | search_start = ins->objectid + num_bytes; | |
1a5bc167 CM |
1693 | goto new_group; |
1694 | } | |
0b86a832 | 1695 | |
1a5bc167 | 1696 | if (test_range_bit(&info->pinned_extents, ins->objectid, |
db94535d CM |
1697 | ins->objectid + num_bytes -1, EXTENT_DIRTY, 0)) { |
1698 | search_start = ins->objectid + num_bytes; | |
1a5bc167 | 1699 | goto new_group; |
fec577fb | 1700 | } |
0b86a832 | 1701 | |
db94535d | 1702 | if (exclude_nr > 0 && (ins->objectid + num_bytes > exclude_start && |
f2654de4 CM |
1703 | ins->objectid < exclude_start + exclude_nr)) { |
1704 | search_start = exclude_start + exclude_nr; | |
1705 | goto new_group; | |
1706 | } | |
0b86a832 | 1707 | |
6324fbf3 | 1708 | if (!(data & BTRFS_BLOCK_GROUP_DATA)) { |
5276aeda | 1709 | block_group = btrfs_lookup_block_group(info, ins->objectid); |
26b8003f CM |
1710 | if (block_group) |
1711 | trans->block_group = block_group; | |
f2458e1d | 1712 | } |
db94535d | 1713 | ins->offset = num_bytes; |
239b14b3 CM |
1714 | if (last_ptr) { |
1715 | *last_ptr = ins->objectid + ins->offset; | |
1716 | if (*last_ptr == | |
1717 | btrfs_super_total_bytes(&root->fs_info->super_copy)) { | |
1718 | *last_ptr = 0; | |
1719 | } | |
1720 | } | |
fec577fb | 1721 | return 0; |
be744175 CM |
1722 | |
1723 | new_group: | |
db94535d | 1724 | if (search_start + num_bytes >= search_end) { |
cf67582b | 1725 | enospc: |
be744175 | 1726 | search_start = orig_search_start; |
fbdc762b CM |
1727 | if (full_scan) { |
1728 | ret = -ENOSPC; | |
1729 | goto error; | |
1730 | } | |
6702ed49 CM |
1731 | if (wrapped) { |
1732 | if (!full_scan) | |
1733 | total_needed -= empty_size; | |
fbdc762b | 1734 | full_scan = 1; |
6702ed49 | 1735 | } else |
fbdc762b | 1736 | wrapped = 1; |
be744175 | 1737 | } |
5276aeda | 1738 | block_group = btrfs_lookup_block_group(info, search_start); |
fbdc762b | 1739 | cond_resched(); |
1a2b2ac7 CM |
1740 | block_group = btrfs_find_block_group(root, block_group, |
1741 | search_start, data, 0); | |
be744175 CM |
1742 | goto check_failed; |
1743 | ||
0f70abe2 | 1744 | error: |
0f70abe2 | 1745 | return ret; |
fec577fb | 1746 | } |
ec44a35c | 1747 | |
fec577fb CM |
1748 | /* |
1749 | * finds a free extent and does all the dirty work required for allocation | |
1750 | * returns the key for the extent through ins, and a tree buffer for | |
1751 | * the first block of the extent through buf. | |
1752 | * | |
1753 | * returns 0 if everything worked, non-zero otherwise. | |
1754 | */ | |
4d775673 | 1755 | int btrfs_alloc_extent(struct btrfs_trans_handle *trans, |
7bb86316 | 1756 | struct btrfs_root *root, |
98d20f67 CM |
1757 | u64 num_bytes, u64 min_alloc_size, |
1758 | u64 root_objectid, u64 ref_generation, | |
7bb86316 CM |
1759 | u64 owner, u64 owner_offset, |
1760 | u64 empty_size, u64 hint_byte, | |
ec44a35c | 1761 | u64 search_end, struct btrfs_key *ins, u64 data) |
fec577fb CM |
1762 | { |
1763 | int ret; | |
1764 | int pending_ret; | |
c31f8830 CM |
1765 | u64 super_used; |
1766 | u64 root_used; | |
fbdc762b | 1767 | u64 search_start = 0; |
8790d502 | 1768 | u64 alloc_profile; |
47e4bb98 | 1769 | u32 sizes[2]; |
1261ec42 CM |
1770 | struct btrfs_fs_info *info = root->fs_info; |
1771 | struct btrfs_root *extent_root = info->extent_root; | |
47e4bb98 CM |
1772 | struct btrfs_extent_item *extent_item; |
1773 | struct btrfs_extent_ref *ref; | |
7bb86316 | 1774 | struct btrfs_path *path; |
47e4bb98 | 1775 | struct btrfs_key keys[2]; |
8f662a76 | 1776 | |
6324fbf3 | 1777 | if (data) { |
8790d502 CM |
1778 | alloc_profile = info->avail_data_alloc_bits & |
1779 | info->data_alloc_profile; | |
1780 | data = BTRFS_BLOCK_GROUP_DATA | alloc_profile; | |
6324fbf3 | 1781 | } else if (root == root->fs_info->chunk_root) { |
8790d502 CM |
1782 | alloc_profile = info->avail_system_alloc_bits & |
1783 | info->system_alloc_profile; | |
1784 | data = BTRFS_BLOCK_GROUP_SYSTEM | alloc_profile; | |
6324fbf3 | 1785 | } else { |
8790d502 CM |
1786 | alloc_profile = info->avail_metadata_alloc_bits & |
1787 | info->metadata_alloc_profile; | |
1788 | data = BTRFS_BLOCK_GROUP_METADATA | alloc_profile; | |
6324fbf3 | 1789 | } |
98d20f67 | 1790 | again: |
a061fc8d | 1791 | data = reduce_alloc_profile(root, data); |
3bf3d9e9 | 1792 | if (root->ref_cows) { |
593060d7 | 1793 | if (!(data & BTRFS_BLOCK_GROUP_METADATA)) { |
6324fbf3 | 1794 | ret = do_chunk_alloc(trans, root->fs_info->extent_root, |
239b14b3 | 1795 | 2 * 1024 * 1024, |
593060d7 | 1796 | BTRFS_BLOCK_GROUP_METADATA | |
8790d502 CM |
1797 | (info->metadata_alloc_profile & |
1798 | info->avail_metadata_alloc_bits)); | |
6324fbf3 CM |
1799 | BUG_ON(ret); |
1800 | } | |
1801 | ret = do_chunk_alloc(trans, root->fs_info->extent_root, | |
8790d502 | 1802 | num_bytes + 2 * 1024 * 1024, data); |
6324fbf3 CM |
1803 | BUG_ON(ret); |
1804 | } | |
0b86a832 | 1805 | |
db94535d CM |
1806 | WARN_ON(num_bytes < root->sectorsize); |
1807 | ret = find_free_extent(trans, root, num_bytes, empty_size, | |
1808 | search_start, search_end, hint_byte, ins, | |
26b8003f CM |
1809 | trans->alloc_exclude_start, |
1810 | trans->alloc_exclude_nr, data); | |
3b951516 | 1811 | |
98d20f67 CM |
1812 | if (ret == -ENOSPC && num_bytes > min_alloc_size) { |
1813 | num_bytes = num_bytes >> 1; | |
1814 | num_bytes = max(num_bytes, min_alloc_size); | |
1815 | goto again; | |
1816 | } | |
ec44a35c CM |
1817 | if (ret) { |
1818 | printk("allocation failed flags %Lu\n", data); | |
1819 | } | |
ccd467d6 | 1820 | BUG_ON(ret); |
f2654de4 CM |
1821 | if (ret) |
1822 | return ret; | |
fec577fb | 1823 | |
58176a96 | 1824 | /* block accounting for super block */ |
db94535d CM |
1825 | super_used = btrfs_super_bytes_used(&info->super_copy); |
1826 | btrfs_set_super_bytes_used(&info->super_copy, super_used + num_bytes); | |
26b8003f | 1827 | |
58176a96 | 1828 | /* block accounting for root item */ |
db94535d CM |
1829 | root_used = btrfs_root_used(&root->root_item); |
1830 | btrfs_set_root_used(&root->root_item, root_used + num_bytes); | |
58176a96 | 1831 | |
f510cfec CM |
1832 | clear_extent_dirty(&root->fs_info->free_space_cache, |
1833 | ins->objectid, ins->objectid + ins->offset - 1, | |
1834 | GFP_NOFS); | |
1835 | ||
26b8003f | 1836 | if (root == extent_root) { |
1a5bc167 CM |
1837 | set_extent_bits(&root->fs_info->extent_ins, ins->objectid, |
1838 | ins->objectid + ins->offset - 1, | |
1839 | EXTENT_LOCKED, GFP_NOFS); | |
26b8003f CM |
1840 | goto update_block; |
1841 | } | |
1842 | ||
1843 | WARN_ON(trans->alloc_exclude_nr); | |
1844 | trans->alloc_exclude_start = ins->objectid; | |
1845 | trans->alloc_exclude_nr = ins->offset; | |
037e6390 | 1846 | |
47e4bb98 CM |
1847 | memcpy(&keys[0], ins, sizeof(*ins)); |
1848 | keys[1].offset = hash_extent_ref(root_objectid, ref_generation, | |
1849 | owner, owner_offset); | |
1850 | keys[1].objectid = ins->objectid; | |
1851 | keys[1].type = BTRFS_EXTENT_REF_KEY; | |
1852 | sizes[0] = sizeof(*extent_item); | |
1853 | sizes[1] = sizeof(*ref); | |
7bb86316 CM |
1854 | |
1855 | path = btrfs_alloc_path(); | |
1856 | BUG_ON(!path); | |
47e4bb98 CM |
1857 | |
1858 | ret = btrfs_insert_empty_items(trans, extent_root, path, keys, | |
1859 | sizes, 2); | |
26b8003f | 1860 | |
ccd467d6 | 1861 | BUG_ON(ret); |
47e4bb98 CM |
1862 | extent_item = btrfs_item_ptr(path->nodes[0], path->slots[0], |
1863 | struct btrfs_extent_item); | |
1864 | btrfs_set_extent_refs(path->nodes[0], extent_item, 1); | |
1865 | ref = btrfs_item_ptr(path->nodes[0], path->slots[0] + 1, | |
1866 | struct btrfs_extent_ref); | |
1867 | ||
1868 | btrfs_set_ref_root(path->nodes[0], ref, root_objectid); | |
1869 | btrfs_set_ref_generation(path->nodes[0], ref, ref_generation); | |
1870 | btrfs_set_ref_objectid(path->nodes[0], ref, owner); | |
1871 | btrfs_set_ref_offset(path->nodes[0], ref, owner_offset); | |
1872 | ||
1873 | btrfs_mark_buffer_dirty(path->nodes[0]); | |
1874 | ||
1875 | trans->alloc_exclude_start = 0; | |
1876 | trans->alloc_exclude_nr = 0; | |
7bb86316 | 1877 | btrfs_free_path(path); |
e089f05c | 1878 | finish_current_insert(trans, extent_root); |
e20d96d6 | 1879 | pending_ret = del_pending_extents(trans, extent_root); |
f510cfec | 1880 | |
e37c9e69 | 1881 | if (ret) { |
037e6390 | 1882 | return ret; |
e37c9e69 CM |
1883 | } |
1884 | if (pending_ret) { | |
037e6390 | 1885 | return pending_ret; |
e37c9e69 | 1886 | } |
26b8003f CM |
1887 | |
1888 | update_block: | |
0b86a832 | 1889 | ret = update_block_group(trans, root, ins->objectid, ins->offset, 1, 0); |
f5947066 CM |
1890 | if (ret) { |
1891 | printk("update block group failed for %Lu %Lu\n", | |
1892 | ins->objectid, ins->offset); | |
1893 | BUG(); | |
1894 | } | |
037e6390 | 1895 | return 0; |
fec577fb CM |
1896 | } |
1897 | ||
1898 | /* | |
1899 | * helper function to allocate a block for a given tree | |
1900 | * returns the tree buffer or NULL. | |
1901 | */ | |
5f39d397 | 1902 | struct extent_buffer *btrfs_alloc_free_block(struct btrfs_trans_handle *trans, |
db94535d | 1903 | struct btrfs_root *root, |
7bb86316 CM |
1904 | u32 blocksize, |
1905 | u64 root_objectid, u64 hint, | |
1906 | u64 empty_size) | |
1907 | { | |
1908 | u64 ref_generation; | |
1909 | ||
1910 | if (root->ref_cows) | |
1911 | ref_generation = trans->transid; | |
1912 | else | |
1913 | ref_generation = 0; | |
1914 | ||
1915 | ||
1916 | return __btrfs_alloc_free_block(trans, root, blocksize, root_objectid, | |
1917 | ref_generation, 0, 0, hint, empty_size); | |
1918 | } | |
1919 | ||
1920 | /* | |
1921 | * helper function to allocate a block for a given tree | |
1922 | * returns the tree buffer or NULL. | |
1923 | */ | |
1924 | struct extent_buffer *__btrfs_alloc_free_block(struct btrfs_trans_handle *trans, | |
1925 | struct btrfs_root *root, | |
1926 | u32 blocksize, | |
1927 | u64 root_objectid, | |
1928 | u64 ref_generation, | |
1929 | u64 first_objectid, | |
1930 | int level, | |
1931 | u64 hint, | |
5f39d397 | 1932 | u64 empty_size) |
fec577fb | 1933 | { |
e2fa7227 | 1934 | struct btrfs_key ins; |
fec577fb | 1935 | int ret; |
5f39d397 | 1936 | struct extent_buffer *buf; |
fec577fb | 1937 | |
98d20f67 | 1938 | ret = btrfs_alloc_extent(trans, root, blocksize, blocksize, |
7bb86316 | 1939 | root_objectid, ref_generation, |
f6dbff55 | 1940 | level, first_objectid, empty_size, hint, |
db94535d | 1941 | (u64)-1, &ins, 0); |
fec577fb | 1942 | if (ret) { |
54aa1f4d CM |
1943 | BUG_ON(ret > 0); |
1944 | return ERR_PTR(ret); | |
fec577fb | 1945 | } |
db94535d | 1946 | buf = btrfs_find_create_tree_block(root, ins.objectid, blocksize); |
54aa1f4d | 1947 | if (!buf) { |
7bb86316 CM |
1948 | btrfs_free_extent(trans, root, ins.objectid, blocksize, |
1949 | root->root_key.objectid, ref_generation, | |
1950 | 0, 0, 0); | |
54aa1f4d CM |
1951 | return ERR_PTR(-ENOMEM); |
1952 | } | |
55c69072 CM |
1953 | btrfs_set_header_generation(buf, trans->transid); |
1954 | clean_tree_block(trans, root, buf); | |
5f39d397 | 1955 | btrfs_set_buffer_uptodate(buf); |
55c69072 CM |
1956 | |
1957 | if (PageDirty(buf->first_page)) { | |
1958 | printk("page %lu dirty\n", buf->first_page->index); | |
1959 | WARN_ON(1); | |
1960 | } | |
1961 | ||
5f39d397 CM |
1962 | set_extent_dirty(&trans->transaction->dirty_pages, buf->start, |
1963 | buf->start + buf->len - 1, GFP_NOFS); | |
9afbb0b7 CM |
1964 | if (!btrfs_test_opt(root, SSD)) |
1965 | btrfs_set_buffer_defrag(buf); | |
d3c2fdcf | 1966 | trans->blocks_used++; |
fec577fb CM |
1967 | return buf; |
1968 | } | |
a28ec197 | 1969 | |
98ed5174 CM |
1970 | static int noinline drop_leaf_ref(struct btrfs_trans_handle *trans, |
1971 | struct btrfs_root *root, | |
1972 | struct extent_buffer *leaf) | |
6407bf6d | 1973 | { |
7bb86316 CM |
1974 | u64 leaf_owner; |
1975 | u64 leaf_generation; | |
5f39d397 | 1976 | struct btrfs_key key; |
6407bf6d CM |
1977 | struct btrfs_file_extent_item *fi; |
1978 | int i; | |
1979 | int nritems; | |
1980 | int ret; | |
1981 | ||
5f39d397 CM |
1982 | BUG_ON(!btrfs_is_leaf(leaf)); |
1983 | nritems = btrfs_header_nritems(leaf); | |
7bb86316 CM |
1984 | leaf_owner = btrfs_header_owner(leaf); |
1985 | leaf_generation = btrfs_header_generation(leaf); | |
1986 | ||
6407bf6d | 1987 | for (i = 0; i < nritems; i++) { |
db94535d | 1988 | u64 disk_bytenr; |
5f39d397 CM |
1989 | |
1990 | btrfs_item_key_to_cpu(leaf, &key, i); | |
1991 | if (btrfs_key_type(&key) != BTRFS_EXTENT_DATA_KEY) | |
6407bf6d CM |
1992 | continue; |
1993 | fi = btrfs_item_ptr(leaf, i, struct btrfs_file_extent_item); | |
5f39d397 CM |
1994 | if (btrfs_file_extent_type(leaf, fi) == |
1995 | BTRFS_FILE_EXTENT_INLINE) | |
236454df | 1996 | continue; |
6407bf6d CM |
1997 | /* |
1998 | * FIXME make sure to insert a trans record that | |
1999 | * repeats the snapshot del on crash | |
2000 | */ | |
db94535d CM |
2001 | disk_bytenr = btrfs_file_extent_disk_bytenr(leaf, fi); |
2002 | if (disk_bytenr == 0) | |
3a686375 | 2003 | continue; |
db94535d | 2004 | ret = btrfs_free_extent(trans, root, disk_bytenr, |
7bb86316 CM |
2005 | btrfs_file_extent_disk_num_bytes(leaf, fi), |
2006 | leaf_owner, leaf_generation, | |
2007 | key.objectid, key.offset, 0); | |
6407bf6d CM |
2008 | BUG_ON(ret); |
2009 | } | |
2010 | return 0; | |
2011 | } | |
2012 | ||
98ed5174 | 2013 | static void noinline reada_walk_down(struct btrfs_root *root, |
bea495e5 CM |
2014 | struct extent_buffer *node, |
2015 | int slot) | |
e011599b | 2016 | { |
db94535d | 2017 | u64 bytenr; |
bea495e5 CM |
2018 | u64 last = 0; |
2019 | u32 nritems; | |
e011599b | 2020 | u32 refs; |
db94535d | 2021 | u32 blocksize; |
bea495e5 CM |
2022 | int ret; |
2023 | int i; | |
2024 | int level; | |
2025 | int skipped = 0; | |
e011599b | 2026 | |
5f39d397 | 2027 | nritems = btrfs_header_nritems(node); |
db94535d | 2028 | level = btrfs_header_level(node); |
bea495e5 CM |
2029 | if (level) |
2030 | return; | |
2031 | ||
2032 | for (i = slot; i < nritems && skipped < 32; i++) { | |
db94535d | 2033 | bytenr = btrfs_node_blockptr(node, i); |
bea495e5 CM |
2034 | if (last && ((bytenr > last && bytenr - last > 32 * 1024) || |
2035 | (last > bytenr && last - bytenr > 32 * 1024))) { | |
2036 | skipped++; | |
e011599b | 2037 | continue; |
bea495e5 CM |
2038 | } |
2039 | blocksize = btrfs_level_size(root, level - 1); | |
2040 | if (i != slot) { | |
2041 | ret = lookup_extent_ref(NULL, root, bytenr, | |
2042 | blocksize, &refs); | |
2043 | BUG_ON(ret); | |
2044 | if (refs != 1) { | |
2045 | skipped++; | |
2046 | continue; | |
2047 | } | |
2048 | } | |
409eb95d | 2049 | mutex_unlock(&root->fs_info->fs_mutex); |
db94535d | 2050 | ret = readahead_tree_block(root, bytenr, blocksize); |
bea495e5 | 2051 | last = bytenr + blocksize; |
409eb95d CM |
2052 | cond_resched(); |
2053 | mutex_lock(&root->fs_info->fs_mutex); | |
e011599b CM |
2054 | if (ret) |
2055 | break; | |
2056 | } | |
2057 | } | |
2058 | ||
9aca1d51 CM |
2059 | /* |
2060 | * helper function for drop_snapshot, this walks down the tree dropping ref | |
2061 | * counts as it goes. | |
2062 | */ | |
98ed5174 CM |
2063 | static int noinline walk_down_tree(struct btrfs_trans_handle *trans, |
2064 | struct btrfs_root *root, | |
2065 | struct btrfs_path *path, int *level) | |
20524f02 | 2066 | { |
7bb86316 CM |
2067 | u64 root_owner; |
2068 | u64 root_gen; | |
2069 | u64 bytenr; | |
5f39d397 CM |
2070 | struct extent_buffer *next; |
2071 | struct extent_buffer *cur; | |
7bb86316 | 2072 | struct extent_buffer *parent; |
db94535d | 2073 | u32 blocksize; |
20524f02 CM |
2074 | int ret; |
2075 | u32 refs; | |
2076 | ||
5caf2a00 CM |
2077 | WARN_ON(*level < 0); |
2078 | WARN_ON(*level >= BTRFS_MAX_LEVEL); | |
5f39d397 | 2079 | ret = lookup_extent_ref(trans, root, |
db94535d CM |
2080 | path->nodes[*level]->start, |
2081 | path->nodes[*level]->len, &refs); | |
20524f02 CM |
2082 | BUG_ON(ret); |
2083 | if (refs > 1) | |
2084 | goto out; | |
e011599b | 2085 | |
9aca1d51 CM |
2086 | /* |
2087 | * walk down to the last node level and free all the leaves | |
2088 | */ | |
6407bf6d | 2089 | while(*level >= 0) { |
5caf2a00 CM |
2090 | WARN_ON(*level < 0); |
2091 | WARN_ON(*level >= BTRFS_MAX_LEVEL); | |
20524f02 | 2092 | cur = path->nodes[*level]; |
e011599b | 2093 | |
5f39d397 | 2094 | if (btrfs_header_level(cur) != *level) |
2c90e5d6 | 2095 | WARN_ON(1); |
e011599b | 2096 | |
7518a238 | 2097 | if (path->slots[*level] >= |
5f39d397 | 2098 | btrfs_header_nritems(cur)) |
20524f02 | 2099 | break; |
6407bf6d CM |
2100 | if (*level == 0) { |
2101 | ret = drop_leaf_ref(trans, root, cur); | |
2102 | BUG_ON(ret); | |
2103 | break; | |
2104 | } | |
db94535d CM |
2105 | bytenr = btrfs_node_blockptr(cur, path->slots[*level]); |
2106 | blocksize = btrfs_level_size(root, *level - 1); | |
2107 | ret = lookup_extent_ref(trans, root, bytenr, blocksize, &refs); | |
6407bf6d CM |
2108 | BUG_ON(ret); |
2109 | if (refs != 1) { | |
7bb86316 CM |
2110 | parent = path->nodes[*level]; |
2111 | root_owner = btrfs_header_owner(parent); | |
2112 | root_gen = btrfs_header_generation(parent); | |
20524f02 | 2113 | path->slots[*level]++; |
db94535d | 2114 | ret = btrfs_free_extent(trans, root, bytenr, |
7bb86316 CM |
2115 | blocksize, root_owner, |
2116 | root_gen, 0, 0, 1); | |
20524f02 CM |
2117 | BUG_ON(ret); |
2118 | continue; | |
2119 | } | |
db94535d | 2120 | next = btrfs_find_tree_block(root, bytenr, blocksize); |
5f39d397 CM |
2121 | if (!next || !btrfs_buffer_uptodate(next)) { |
2122 | free_extent_buffer(next); | |
bea495e5 | 2123 | reada_walk_down(root, cur, path->slots[*level]); |
8790d502 CM |
2124 | |
2125 | mutex_unlock(&root->fs_info->fs_mutex); | |
db94535d | 2126 | next = read_tree_block(root, bytenr, blocksize); |
8790d502 | 2127 | mutex_lock(&root->fs_info->fs_mutex); |
e9d0b13b | 2128 | |
8790d502 | 2129 | /* we've dropped the lock, double check */ |
db94535d CM |
2130 | ret = lookup_extent_ref(trans, root, bytenr, |
2131 | blocksize, &refs); | |
e9d0b13b CM |
2132 | BUG_ON(ret); |
2133 | if (refs != 1) { | |
7bb86316 CM |
2134 | parent = path->nodes[*level]; |
2135 | root_owner = btrfs_header_owner(parent); | |
2136 | root_gen = btrfs_header_generation(parent); | |
2137 | ||
e9d0b13b | 2138 | path->slots[*level]++; |
5f39d397 | 2139 | free_extent_buffer(next); |
7bb86316 CM |
2140 | ret = btrfs_free_extent(trans, root, bytenr, |
2141 | blocksize, | |
2142 | root_owner, | |
2143 | root_gen, 0, 0, 1); | |
e9d0b13b CM |
2144 | BUG_ON(ret); |
2145 | continue; | |
2146 | } | |
0999df54 CM |
2147 | } else if (next) { |
2148 | btrfs_verify_block_csum(root, next); | |
e9d0b13b | 2149 | } |
5caf2a00 | 2150 | WARN_ON(*level <= 0); |
83e15a28 | 2151 | if (path->nodes[*level-1]) |
5f39d397 | 2152 | free_extent_buffer(path->nodes[*level-1]); |
20524f02 | 2153 | path->nodes[*level-1] = next; |
5f39d397 | 2154 | *level = btrfs_header_level(next); |
20524f02 CM |
2155 | path->slots[*level] = 0; |
2156 | } | |
2157 | out: | |
5caf2a00 CM |
2158 | WARN_ON(*level < 0); |
2159 | WARN_ON(*level >= BTRFS_MAX_LEVEL); | |
7bb86316 CM |
2160 | |
2161 | if (path->nodes[*level] == root->node) { | |
2162 | root_owner = root->root_key.objectid; | |
2163 | parent = path->nodes[*level]; | |
2164 | } else { | |
2165 | parent = path->nodes[*level + 1]; | |
2166 | root_owner = btrfs_header_owner(parent); | |
2167 | } | |
2168 | ||
2169 | root_gen = btrfs_header_generation(parent); | |
db94535d | 2170 | ret = btrfs_free_extent(trans, root, path->nodes[*level]->start, |
7bb86316 CM |
2171 | path->nodes[*level]->len, |
2172 | root_owner, root_gen, 0, 0, 1); | |
5f39d397 | 2173 | free_extent_buffer(path->nodes[*level]); |
20524f02 CM |
2174 | path->nodes[*level] = NULL; |
2175 | *level += 1; | |
2176 | BUG_ON(ret); | |
2177 | return 0; | |
2178 | } | |
2179 | ||
9aca1d51 CM |
2180 | /* |
2181 | * helper for dropping snapshots. This walks back up the tree in the path | |
2182 | * to find the first node higher up where we haven't yet gone through | |
2183 | * all the slots | |
2184 | */ | |
98ed5174 CM |
2185 | static int noinline walk_up_tree(struct btrfs_trans_handle *trans, |
2186 | struct btrfs_root *root, | |
2187 | struct btrfs_path *path, int *level) | |
20524f02 | 2188 | { |
7bb86316 CM |
2189 | u64 root_owner; |
2190 | u64 root_gen; | |
2191 | struct btrfs_root_item *root_item = &root->root_item; | |
20524f02 CM |
2192 | int i; |
2193 | int slot; | |
2194 | int ret; | |
9f3a7427 | 2195 | |
234b63a0 | 2196 | for(i = *level; i < BTRFS_MAX_LEVEL - 1 && path->nodes[i]; i++) { |
20524f02 | 2197 | slot = path->slots[i]; |
5f39d397 CM |
2198 | if (slot < btrfs_header_nritems(path->nodes[i]) - 1) { |
2199 | struct extent_buffer *node; | |
2200 | struct btrfs_disk_key disk_key; | |
2201 | node = path->nodes[i]; | |
20524f02 CM |
2202 | path->slots[i]++; |
2203 | *level = i; | |
9f3a7427 | 2204 | WARN_ON(*level == 0); |
5f39d397 | 2205 | btrfs_node_key(node, &disk_key, path->slots[i]); |
9f3a7427 | 2206 | memcpy(&root_item->drop_progress, |
5f39d397 | 2207 | &disk_key, sizeof(disk_key)); |
9f3a7427 | 2208 | root_item->drop_level = i; |
20524f02 CM |
2209 | return 0; |
2210 | } else { | |
7bb86316 CM |
2211 | if (path->nodes[*level] == root->node) { |
2212 | root_owner = root->root_key.objectid; | |
2213 | root_gen = | |
2214 | btrfs_header_generation(path->nodes[*level]); | |
2215 | } else { | |
2216 | struct extent_buffer *node; | |
2217 | node = path->nodes[*level + 1]; | |
2218 | root_owner = btrfs_header_owner(node); | |
2219 | root_gen = btrfs_header_generation(node); | |
2220 | } | |
e089f05c | 2221 | ret = btrfs_free_extent(trans, root, |
db94535d | 2222 | path->nodes[*level]->start, |
7bb86316 CM |
2223 | path->nodes[*level]->len, |
2224 | root_owner, root_gen, 0, 0, 1); | |
6407bf6d | 2225 | BUG_ON(ret); |
5f39d397 | 2226 | free_extent_buffer(path->nodes[*level]); |
83e15a28 | 2227 | path->nodes[*level] = NULL; |
20524f02 | 2228 | *level = i + 1; |
20524f02 CM |
2229 | } |
2230 | } | |
2231 | return 1; | |
2232 | } | |
2233 | ||
9aca1d51 CM |
2234 | /* |
2235 | * drop the reference count on the tree rooted at 'snap'. This traverses | |
2236 | * the tree freeing any blocks that have a ref count of zero after being | |
2237 | * decremented. | |
2238 | */ | |
e089f05c | 2239 | int btrfs_drop_snapshot(struct btrfs_trans_handle *trans, struct btrfs_root |
9f3a7427 | 2240 | *root) |
20524f02 | 2241 | { |
3768f368 | 2242 | int ret = 0; |
9aca1d51 | 2243 | int wret; |
20524f02 | 2244 | int level; |
5caf2a00 | 2245 | struct btrfs_path *path; |
20524f02 CM |
2246 | int i; |
2247 | int orig_level; | |
9f3a7427 | 2248 | struct btrfs_root_item *root_item = &root->root_item; |
20524f02 | 2249 | |
5caf2a00 CM |
2250 | path = btrfs_alloc_path(); |
2251 | BUG_ON(!path); | |
20524f02 | 2252 | |
5f39d397 | 2253 | level = btrfs_header_level(root->node); |
20524f02 | 2254 | orig_level = level; |
9f3a7427 CM |
2255 | if (btrfs_disk_key_objectid(&root_item->drop_progress) == 0) { |
2256 | path->nodes[level] = root->node; | |
f510cfec | 2257 | extent_buffer_get(root->node); |
9f3a7427 CM |
2258 | path->slots[level] = 0; |
2259 | } else { | |
2260 | struct btrfs_key key; | |
5f39d397 CM |
2261 | struct btrfs_disk_key found_key; |
2262 | struct extent_buffer *node; | |
6702ed49 | 2263 | |
9f3a7427 | 2264 | btrfs_disk_key_to_cpu(&key, &root_item->drop_progress); |
6702ed49 CM |
2265 | level = root_item->drop_level; |
2266 | path->lowest_level = level; | |
9f3a7427 | 2267 | wret = btrfs_search_slot(NULL, root, &key, path, 0, 0); |
6702ed49 | 2268 | if (wret < 0) { |
9f3a7427 CM |
2269 | ret = wret; |
2270 | goto out; | |
2271 | } | |
5f39d397 CM |
2272 | node = path->nodes[level]; |
2273 | btrfs_node_key(node, &found_key, path->slots[level]); | |
2274 | WARN_ON(memcmp(&found_key, &root_item->drop_progress, | |
2275 | sizeof(found_key))); | |
9f3a7427 | 2276 | } |
20524f02 | 2277 | while(1) { |
5caf2a00 | 2278 | wret = walk_down_tree(trans, root, path, &level); |
9aca1d51 | 2279 | if (wret > 0) |
20524f02 | 2280 | break; |
9aca1d51 CM |
2281 | if (wret < 0) |
2282 | ret = wret; | |
2283 | ||
5caf2a00 | 2284 | wret = walk_up_tree(trans, root, path, &level); |
9aca1d51 | 2285 | if (wret > 0) |
20524f02 | 2286 | break; |
9aca1d51 CM |
2287 | if (wret < 0) |
2288 | ret = wret; | |
409eb95d | 2289 | ret = -EAGAIN; |
409eb95d | 2290 | break; |
20524f02 | 2291 | } |
83e15a28 | 2292 | for (i = 0; i <= orig_level; i++) { |
5caf2a00 | 2293 | if (path->nodes[i]) { |
5f39d397 | 2294 | free_extent_buffer(path->nodes[i]); |
0f82731f | 2295 | path->nodes[i] = NULL; |
83e15a28 | 2296 | } |
20524f02 | 2297 | } |
9f3a7427 | 2298 | out: |
5caf2a00 | 2299 | btrfs_free_path(path); |
9aca1d51 | 2300 | return ret; |
20524f02 | 2301 | } |
9078a3e1 | 2302 | |
96b5179d | 2303 | int btrfs_free_block_groups(struct btrfs_fs_info *info) |
9078a3e1 | 2304 | { |
96b5179d CM |
2305 | u64 start; |
2306 | u64 end; | |
b97f9203 | 2307 | u64 ptr; |
9078a3e1 | 2308 | int ret; |
9078a3e1 | 2309 | while(1) { |
96b5179d CM |
2310 | ret = find_first_extent_bit(&info->block_group_cache, 0, |
2311 | &start, &end, (unsigned int)-1); | |
2312 | if (ret) | |
9078a3e1 | 2313 | break; |
b97f9203 Y |
2314 | ret = get_state_private(&info->block_group_cache, start, &ptr); |
2315 | if (!ret) | |
2316 | kfree((void *)(unsigned long)ptr); | |
96b5179d CM |
2317 | clear_extent_bits(&info->block_group_cache, start, |
2318 | end, (unsigned int)-1, GFP_NOFS); | |
9078a3e1 | 2319 | } |
e37c9e69 | 2320 | while(1) { |
f510cfec CM |
2321 | ret = find_first_extent_bit(&info->free_space_cache, 0, |
2322 | &start, &end, EXTENT_DIRTY); | |
2323 | if (ret) | |
e37c9e69 | 2324 | break; |
f510cfec CM |
2325 | clear_extent_dirty(&info->free_space_cache, start, |
2326 | end, GFP_NOFS); | |
e37c9e69 | 2327 | } |
be744175 CM |
2328 | return 0; |
2329 | } | |
2330 | ||
8e7bf94f CM |
2331 | static unsigned long calc_ra(unsigned long start, unsigned long last, |
2332 | unsigned long nr) | |
2333 | { | |
2334 | return min(last, start + nr - 1); | |
2335 | } | |
2336 | ||
98ed5174 CM |
2337 | static int noinline relocate_inode_pages(struct inode *inode, u64 start, |
2338 | u64 len) | |
edbd8d4e CM |
2339 | { |
2340 | u64 page_start; | |
2341 | u64 page_end; | |
edbd8d4e | 2342 | unsigned long last_index; |
edbd8d4e CM |
2343 | unsigned long i; |
2344 | struct page *page; | |
d1310b2e | 2345 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; |
4313b399 | 2346 | struct file_ra_state *ra; |
8e7bf94f CM |
2347 | unsigned long total_read = 0; |
2348 | unsigned long ra_pages; | |
a061fc8d | 2349 | struct btrfs_trans_handle *trans; |
4313b399 CM |
2350 | |
2351 | ra = kzalloc(sizeof(*ra), GFP_NOFS); | |
edbd8d4e CM |
2352 | |
2353 | mutex_lock(&inode->i_mutex); | |
4313b399 | 2354 | i = start >> PAGE_CACHE_SHIFT; |
edbd8d4e CM |
2355 | last_index = (start + len - 1) >> PAGE_CACHE_SHIFT; |
2356 | ||
8e7bf94f CM |
2357 | ra_pages = BTRFS_I(inode)->root->fs_info->bdi.ra_pages; |
2358 | ||
4313b399 | 2359 | file_ra_state_init(ra, inode->i_mapping); |
edbd8d4e | 2360 | |
4313b399 | 2361 | for (; i <= last_index; i++) { |
8e7bf94f CM |
2362 | if (total_read % ra_pages == 0) { |
2363 | btrfs_force_ra(inode->i_mapping, ra, NULL, i, | |
2364 | calc_ra(i, last_index, ra_pages)); | |
2365 | } | |
2366 | total_read++; | |
a061fc8d CM |
2367 | if (((u64)i << PAGE_CACHE_SHIFT) > inode->i_size) |
2368 | goto truncate_racing; | |
2369 | ||
edbd8d4e | 2370 | page = grab_cache_page(inode->i_mapping, i); |
a061fc8d | 2371 | if (!page) { |
edbd8d4e | 2372 | goto out_unlock; |
a061fc8d | 2373 | } |
edbd8d4e CM |
2374 | if (!PageUptodate(page)) { |
2375 | btrfs_readpage(NULL, page); | |
2376 | lock_page(page); | |
2377 | if (!PageUptodate(page)) { | |
2378 | unlock_page(page); | |
2379 | page_cache_release(page); | |
2380 | goto out_unlock; | |
2381 | } | |
2382 | } | |
ec44a35c CM |
2383 | #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,18) |
2384 | ClearPageDirty(page); | |
2385 | #else | |
2386 | cancel_dirty_page(page, PAGE_CACHE_SIZE); | |
2387 | #endif | |
2388 | wait_on_page_writeback(page); | |
2389 | set_page_extent_mapped(page); | |
edbd8d4e CM |
2390 | page_start = (u64)page->index << PAGE_CACHE_SHIFT; |
2391 | page_end = page_start + PAGE_CACHE_SIZE - 1; | |
2392 | ||
d1310b2e | 2393 | lock_extent(io_tree, page_start, page_end, GFP_NOFS); |
edbd8d4e | 2394 | |
d1310b2e | 2395 | set_extent_delalloc(io_tree, page_start, |
edbd8d4e | 2396 | page_end, GFP_NOFS); |
a061fc8d | 2397 | set_page_dirty(page); |
edbd8d4e | 2398 | |
d1310b2e | 2399 | unlock_extent(io_tree, page_start, page_end, GFP_NOFS); |
edbd8d4e CM |
2400 | unlock_page(page); |
2401 | page_cache_release(page); | |
2402 | } | |
a061fc8d CM |
2403 | balance_dirty_pages_ratelimited_nr(inode->i_mapping, |
2404 | total_read); | |
edbd8d4e CM |
2405 | |
2406 | out_unlock: | |
ec44a35c | 2407 | kfree(ra); |
a061fc8d CM |
2408 | trans = btrfs_start_transaction(BTRFS_I(inode)->root, 1); |
2409 | if (trans) { | |
2410 | btrfs_add_ordered_inode(inode); | |
2411 | btrfs_end_transaction(trans, BTRFS_I(inode)->root); | |
2412 | mark_inode_dirty(inode); | |
2413 | } | |
edbd8d4e CM |
2414 | mutex_unlock(&inode->i_mutex); |
2415 | return 0; | |
a061fc8d CM |
2416 | |
2417 | truncate_racing: | |
2418 | vmtruncate(inode, inode->i_size); | |
2419 | balance_dirty_pages_ratelimited_nr(inode->i_mapping, | |
2420 | total_read); | |
2421 | goto out_unlock; | |
edbd8d4e CM |
2422 | } |
2423 | ||
bf4ef679 CM |
2424 | /* |
2425 | * The back references tell us which tree holds a ref on a block, | |
2426 | * but it is possible for the tree root field in the reference to | |
2427 | * reflect the original root before a snapshot was made. In this | |
2428 | * case we should search through all the children of a given root | |
2429 | * to find potential holders of references on a block. | |
2430 | * | |
2431 | * Instead, we do something a little less fancy and just search | |
2432 | * all the roots for a given key/block combination. | |
2433 | */ | |
2434 | static int find_root_for_ref(struct btrfs_root *root, | |
2435 | struct btrfs_path *path, | |
2436 | struct btrfs_key *key0, | |
2437 | int level, | |
2438 | int file_key, | |
2439 | struct btrfs_root **found_root, | |
2440 | u64 bytenr) | |
2441 | { | |
2442 | struct btrfs_key root_location; | |
2443 | struct btrfs_root *cur_root = *found_root; | |
2444 | struct btrfs_file_extent_item *file_extent; | |
2445 | u64 root_search_start = BTRFS_FS_TREE_OBJECTID; | |
2446 | u64 found_bytenr; | |
2447 | int ret; | |
2448 | int i; | |
2449 | ||
2450 | root_location.offset = (u64)-1; | |
2451 | root_location.type = BTRFS_ROOT_ITEM_KEY; | |
2452 | path->lowest_level = level; | |
2453 | path->reada = 0; | |
2454 | while(1) { | |
2455 | ret = btrfs_search_slot(NULL, cur_root, key0, path, 0, 0); | |
2456 | found_bytenr = 0; | |
2457 | if (ret == 0 && file_key) { | |
2458 | struct extent_buffer *leaf = path->nodes[0]; | |
2459 | file_extent = btrfs_item_ptr(leaf, path->slots[0], | |
2460 | struct btrfs_file_extent_item); | |
2461 | if (btrfs_file_extent_type(leaf, file_extent) == | |
2462 | BTRFS_FILE_EXTENT_REG) { | |
2463 | found_bytenr = | |
2464 | btrfs_file_extent_disk_bytenr(leaf, | |
2465 | file_extent); | |
2466 | } | |
2467 | } else if (ret == 0) { | |
2468 | if (path->nodes[level]) | |
2469 | found_bytenr = path->nodes[level]->start; | |
2470 | } | |
2471 | ||
2472 | for (i = level; i < BTRFS_MAX_LEVEL; i++) { | |
2473 | if (!path->nodes[i]) | |
2474 | break; | |
2475 | free_extent_buffer(path->nodes[i]); | |
2476 | path->nodes[i] = NULL; | |
2477 | } | |
2478 | btrfs_release_path(cur_root, path); | |
2479 | ||
2480 | if (found_bytenr == bytenr) { | |
2481 | *found_root = cur_root; | |
2482 | ret = 0; | |
2483 | goto out; | |
2484 | } | |
2485 | ret = btrfs_search_root(root->fs_info->tree_root, | |
2486 | root_search_start, &root_search_start); | |
2487 | if (ret) | |
2488 | break; | |
2489 | ||
2490 | root_location.objectid = root_search_start; | |
2491 | cur_root = btrfs_read_fs_root_no_name(root->fs_info, | |
2492 | &root_location); | |
2493 | if (!cur_root) { | |
2494 | ret = 1; | |
2495 | break; | |
2496 | } | |
2497 | } | |
2498 | out: | |
2499 | path->lowest_level = 0; | |
2500 | return ret; | |
2501 | } | |
2502 | ||
4313b399 CM |
2503 | /* |
2504 | * note, this releases the path | |
2505 | */ | |
98ed5174 | 2506 | static int noinline relocate_one_reference(struct btrfs_root *extent_root, |
edbd8d4e | 2507 | struct btrfs_path *path, |
4313b399 | 2508 | struct btrfs_key *extent_key) |
edbd8d4e CM |
2509 | { |
2510 | struct inode *inode; | |
2511 | struct btrfs_root *found_root; | |
bf4ef679 CM |
2512 | struct btrfs_key root_location; |
2513 | struct btrfs_key found_key; | |
4313b399 CM |
2514 | struct btrfs_extent_ref *ref; |
2515 | u64 ref_root; | |
2516 | u64 ref_gen; | |
2517 | u64 ref_objectid; | |
2518 | u64 ref_offset; | |
edbd8d4e | 2519 | int ret; |
bf4ef679 | 2520 | int level; |
edbd8d4e | 2521 | |
4313b399 CM |
2522 | ref = btrfs_item_ptr(path->nodes[0], path->slots[0], |
2523 | struct btrfs_extent_ref); | |
2524 | ref_root = btrfs_ref_root(path->nodes[0], ref); | |
2525 | ref_gen = btrfs_ref_generation(path->nodes[0], ref); | |
2526 | ref_objectid = btrfs_ref_objectid(path->nodes[0], ref); | |
2527 | ref_offset = btrfs_ref_offset(path->nodes[0], ref); | |
2528 | btrfs_release_path(extent_root, path); | |
2529 | ||
bf4ef679 | 2530 | root_location.objectid = ref_root; |
edbd8d4e | 2531 | if (ref_gen == 0) |
bf4ef679 | 2532 | root_location.offset = 0; |
edbd8d4e | 2533 | else |
bf4ef679 CM |
2534 | root_location.offset = (u64)-1; |
2535 | root_location.type = BTRFS_ROOT_ITEM_KEY; | |
edbd8d4e CM |
2536 | |
2537 | found_root = btrfs_read_fs_root_no_name(extent_root->fs_info, | |
bf4ef679 | 2538 | &root_location); |
edbd8d4e CM |
2539 | BUG_ON(!found_root); |
2540 | ||
2541 | if (ref_objectid >= BTRFS_FIRST_FREE_OBJECTID) { | |
bf4ef679 CM |
2542 | found_key.objectid = ref_objectid; |
2543 | found_key.type = BTRFS_EXTENT_DATA_KEY; | |
2544 | found_key.offset = ref_offset; | |
2545 | level = 0; | |
2546 | ||
2547 | ret = find_root_for_ref(extent_root, path, &found_key, | |
2548 | level, 1, &found_root, | |
2549 | extent_key->objectid); | |
2550 | ||
2551 | if (ret) | |
2552 | goto out; | |
2553 | ||
edbd8d4e CM |
2554 | mutex_unlock(&extent_root->fs_info->fs_mutex); |
2555 | inode = btrfs_iget_locked(extent_root->fs_info->sb, | |
2556 | ref_objectid, found_root); | |
2557 | if (inode->i_state & I_NEW) { | |
2558 | /* the inode and parent dir are two different roots */ | |
2559 | BTRFS_I(inode)->root = found_root; | |
2560 | BTRFS_I(inode)->location.objectid = ref_objectid; | |
2561 | BTRFS_I(inode)->location.type = BTRFS_INODE_ITEM_KEY; | |
2562 | BTRFS_I(inode)->location.offset = 0; | |
2563 | btrfs_read_locked_inode(inode); | |
2564 | unlock_new_inode(inode); | |
2565 | ||
2566 | } | |
2567 | /* this can happen if the reference is not against | |
2568 | * the latest version of the tree root | |
2569 | */ | |
2570 | if (is_bad_inode(inode)) { | |
2571 | mutex_lock(&extent_root->fs_info->fs_mutex); | |
2572 | goto out; | |
2573 | } | |
2574 | relocate_inode_pages(inode, ref_offset, extent_key->offset); | |
edbd8d4e CM |
2575 | iput(inode); |
2576 | mutex_lock(&extent_root->fs_info->fs_mutex); | |
2577 | } else { | |
2578 | struct btrfs_trans_handle *trans; | |
edbd8d4e | 2579 | struct extent_buffer *eb; |
edbd8d4e CM |
2580 | int i; |
2581 | ||
edbd8d4e CM |
2582 | eb = read_tree_block(found_root, extent_key->objectid, |
2583 | extent_key->offset); | |
2584 | level = btrfs_header_level(eb); | |
2585 | ||
2586 | if (level == 0) | |
2587 | btrfs_item_key_to_cpu(eb, &found_key, 0); | |
2588 | else | |
2589 | btrfs_node_key_to_cpu(eb, &found_key, 0); | |
2590 | ||
2591 | free_extent_buffer(eb); | |
2592 | ||
bf4ef679 CM |
2593 | ret = find_root_for_ref(extent_root, path, &found_key, |
2594 | level, 0, &found_root, | |
2595 | extent_key->objectid); | |
2596 | ||
2597 | if (ret) | |
2598 | goto out; | |
2599 | ||
2600 | trans = btrfs_start_transaction(found_root, 1); | |
2601 | ||
edbd8d4e | 2602 | path->lowest_level = level; |
8f662a76 | 2603 | path->reada = 2; |
edbd8d4e CM |
2604 | ret = btrfs_search_slot(trans, found_root, &found_key, path, |
2605 | 0, 1); | |
2606 | path->lowest_level = 0; | |
2607 | for (i = level; i < BTRFS_MAX_LEVEL; i++) { | |
2608 | if (!path->nodes[i]) | |
2609 | break; | |
2610 | free_extent_buffer(path->nodes[i]); | |
2611 | path->nodes[i] = NULL; | |
2612 | } | |
2613 | btrfs_release_path(found_root, path); | |
2614 | btrfs_end_transaction(trans, found_root); | |
2615 | } | |
2616 | ||
2617 | out: | |
2618 | return 0; | |
2619 | } | |
2620 | ||
a061fc8d CM |
2621 | static int noinline del_extent_zero(struct btrfs_root *extent_root, |
2622 | struct btrfs_path *path, | |
2623 | struct btrfs_key *extent_key) | |
2624 | { | |
2625 | int ret; | |
2626 | struct btrfs_trans_handle *trans; | |
2627 | ||
2628 | trans = btrfs_start_transaction(extent_root, 1); | |
2629 | ret = btrfs_search_slot(trans, extent_root, extent_key, path, -1, 1); | |
2630 | if (ret > 0) { | |
2631 | ret = -EIO; | |
2632 | goto out; | |
2633 | } | |
2634 | if (ret < 0) | |
2635 | goto out; | |
2636 | ret = btrfs_del_item(trans, extent_root, path); | |
2637 | out: | |
2638 | btrfs_end_transaction(trans, extent_root); | |
2639 | return ret; | |
2640 | } | |
2641 | ||
98ed5174 CM |
2642 | static int noinline relocate_one_extent(struct btrfs_root *extent_root, |
2643 | struct btrfs_path *path, | |
2644 | struct btrfs_key *extent_key) | |
edbd8d4e CM |
2645 | { |
2646 | struct btrfs_key key; | |
2647 | struct btrfs_key found_key; | |
edbd8d4e | 2648 | struct extent_buffer *leaf; |
edbd8d4e CM |
2649 | u32 nritems; |
2650 | u32 item_size; | |
2651 | int ret = 0; | |
2652 | ||
a061fc8d CM |
2653 | if (extent_key->objectid == 0) { |
2654 | ret = del_extent_zero(extent_root, path, extent_key); | |
2655 | goto out; | |
2656 | } | |
edbd8d4e CM |
2657 | key.objectid = extent_key->objectid; |
2658 | key.type = BTRFS_EXTENT_REF_KEY; | |
2659 | key.offset = 0; | |
2660 | ||
2661 | while(1) { | |
2662 | ret = btrfs_search_slot(NULL, extent_root, &key, path, 0, 0); | |
2663 | ||
edbd8d4e CM |
2664 | if (ret < 0) |
2665 | goto out; | |
2666 | ||
2667 | ret = 0; | |
2668 | leaf = path->nodes[0]; | |
2669 | nritems = btrfs_header_nritems(leaf); | |
a061fc8d CM |
2670 | if (path->slots[0] == nritems) { |
2671 | ret = btrfs_next_leaf(extent_root, path); | |
2672 | if (ret > 0) { | |
2673 | ret = 0; | |
2674 | goto out; | |
2675 | } | |
2676 | if (ret < 0) | |
2677 | goto out; | |
bf4ef679 | 2678 | leaf = path->nodes[0]; |
a061fc8d | 2679 | } |
edbd8d4e CM |
2680 | |
2681 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); | |
a061fc8d | 2682 | if (found_key.objectid != extent_key->objectid) { |
edbd8d4e | 2683 | break; |
a061fc8d | 2684 | } |
edbd8d4e | 2685 | |
a061fc8d | 2686 | if (found_key.type != BTRFS_EXTENT_REF_KEY) { |
edbd8d4e | 2687 | break; |
a061fc8d | 2688 | } |
edbd8d4e CM |
2689 | |
2690 | key.offset = found_key.offset + 1; | |
2691 | item_size = btrfs_item_size_nr(leaf, path->slots[0]); | |
2692 | ||
4313b399 | 2693 | ret = relocate_one_reference(extent_root, path, extent_key); |
edbd8d4e CM |
2694 | if (ret) |
2695 | goto out; | |
2696 | } | |
2697 | ret = 0; | |
2698 | out: | |
2699 | btrfs_release_path(extent_root, path); | |
2700 | return ret; | |
2701 | } | |
2702 | ||
ec44a35c CM |
2703 | static u64 update_block_group_flags(struct btrfs_root *root, u64 flags) |
2704 | { | |
2705 | u64 num_devices; | |
2706 | u64 stripped = BTRFS_BLOCK_GROUP_RAID0 | | |
2707 | BTRFS_BLOCK_GROUP_RAID1 | BTRFS_BLOCK_GROUP_RAID10; | |
2708 | ||
a061fc8d | 2709 | num_devices = root->fs_info->fs_devices->num_devices; |
ec44a35c CM |
2710 | if (num_devices == 1) { |
2711 | stripped |= BTRFS_BLOCK_GROUP_DUP; | |
2712 | stripped = flags & ~stripped; | |
2713 | ||
2714 | /* turn raid0 into single device chunks */ | |
2715 | if (flags & BTRFS_BLOCK_GROUP_RAID0) | |
2716 | return stripped; | |
2717 | ||
2718 | /* turn mirroring into duplication */ | |
2719 | if (flags & (BTRFS_BLOCK_GROUP_RAID1 | | |
2720 | BTRFS_BLOCK_GROUP_RAID10)) | |
2721 | return stripped | BTRFS_BLOCK_GROUP_DUP; | |
2722 | return flags; | |
2723 | } else { | |
2724 | /* they already had raid on here, just return */ | |
ec44a35c CM |
2725 | if (flags & stripped) |
2726 | return flags; | |
2727 | ||
2728 | stripped |= BTRFS_BLOCK_GROUP_DUP; | |
2729 | stripped = flags & ~stripped; | |
2730 | ||
2731 | /* switch duplicated blocks with raid1 */ | |
2732 | if (flags & BTRFS_BLOCK_GROUP_DUP) | |
2733 | return stripped | BTRFS_BLOCK_GROUP_RAID1; | |
2734 | ||
2735 | /* turn single device chunks into raid0 */ | |
2736 | return stripped | BTRFS_BLOCK_GROUP_RAID0; | |
2737 | } | |
2738 | return flags; | |
2739 | } | |
2740 | ||
8f18cf13 | 2741 | int btrfs_shrink_extent_tree(struct btrfs_root *root, u64 shrink_start) |
edbd8d4e CM |
2742 | { |
2743 | struct btrfs_trans_handle *trans; | |
2744 | struct btrfs_root *tree_root = root->fs_info->tree_root; | |
2745 | struct btrfs_path *path; | |
2746 | u64 cur_byte; | |
2747 | u64 total_found; | |
8f18cf13 | 2748 | u64 shrink_last_byte; |
ec44a35c | 2749 | u64 new_alloc_flags; |
8f18cf13 | 2750 | struct btrfs_block_group_cache *shrink_block_group; |
edbd8d4e | 2751 | struct btrfs_fs_info *info = root->fs_info; |
edbd8d4e | 2752 | struct btrfs_key key; |
73e48b27 | 2753 | struct btrfs_key found_key; |
edbd8d4e CM |
2754 | struct extent_buffer *leaf; |
2755 | u32 nritems; | |
2756 | int ret; | |
a061fc8d | 2757 | int progress; |
edbd8d4e | 2758 | |
8f18cf13 CM |
2759 | shrink_block_group = btrfs_lookup_block_group(root->fs_info, |
2760 | shrink_start); | |
2761 | BUG_ON(!shrink_block_group); | |
2762 | ||
2763 | shrink_last_byte = shrink_start + shrink_block_group->key.offset; | |
2764 | ||
2765 | shrink_block_group->space_info->total_bytes -= | |
2766 | shrink_block_group->key.offset; | |
edbd8d4e CM |
2767 | path = btrfs_alloc_path(); |
2768 | root = root->fs_info->extent_root; | |
8f662a76 | 2769 | path->reada = 2; |
edbd8d4e CM |
2770 | |
2771 | again: | |
ec44a35c CM |
2772 | if (btrfs_block_group_used(&shrink_block_group->item) > 0) { |
2773 | trans = btrfs_start_transaction(root, 1); | |
2774 | new_alloc_flags = update_block_group_flags(root, | |
2775 | shrink_block_group->flags); | |
2776 | do_chunk_alloc(trans, root->fs_info->extent_root, | |
8f18cf13 | 2777 | btrfs_block_group_used(&shrink_block_group->item) + |
ec44a35c CM |
2778 | 2 * 1024 * 1024, new_alloc_flags); |
2779 | btrfs_end_transaction(trans, root); | |
2780 | } | |
8f18cf13 CM |
2781 | shrink_block_group->ro = 1; |
2782 | ||
edbd8d4e | 2783 | total_found = 0; |
a061fc8d | 2784 | progress = 0; |
8f18cf13 | 2785 | key.objectid = shrink_start; |
edbd8d4e CM |
2786 | key.offset = 0; |
2787 | key.type = 0; | |
73e48b27 | 2788 | cur_byte = key.objectid; |
4313b399 | 2789 | |
73e48b27 Y |
2790 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); |
2791 | if (ret < 0) | |
2792 | goto out; | |
2793 | ||
0b86a832 | 2794 | ret = btrfs_previous_item(root, path, 0, BTRFS_EXTENT_ITEM_KEY); |
73e48b27 Y |
2795 | if (ret < 0) |
2796 | goto out; | |
8f18cf13 | 2797 | |
73e48b27 Y |
2798 | if (ret == 0) { |
2799 | leaf = path->nodes[0]; | |
2800 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); | |
8f18cf13 CM |
2801 | if (found_key.objectid + found_key.offset > shrink_start && |
2802 | found_key.objectid < shrink_last_byte) { | |
73e48b27 Y |
2803 | cur_byte = found_key.objectid; |
2804 | key.objectid = cur_byte; | |
2805 | } | |
2806 | } | |
2807 | btrfs_release_path(root, path); | |
2808 | ||
2809 | while(1) { | |
edbd8d4e CM |
2810 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); |
2811 | if (ret < 0) | |
2812 | goto out; | |
73e48b27 | 2813 | |
edbd8d4e | 2814 | leaf = path->nodes[0]; |
73e48b27 Y |
2815 | nritems = btrfs_header_nritems(leaf); |
2816 | next: | |
2817 | if (path->slots[0] >= nritems) { | |
2818 | ret = btrfs_next_leaf(root, path); | |
2819 | if (ret < 0) | |
2820 | goto out; | |
2821 | if (ret == 1) { | |
2822 | ret = 0; | |
2823 | break; | |
edbd8d4e | 2824 | } |
73e48b27 Y |
2825 | leaf = path->nodes[0]; |
2826 | nritems = btrfs_header_nritems(leaf); | |
edbd8d4e | 2827 | } |
73e48b27 Y |
2828 | |
2829 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); | |
725c8463 | 2830 | |
8f18cf13 CM |
2831 | if (found_key.objectid >= shrink_last_byte) |
2832 | break; | |
2833 | ||
725c8463 CM |
2834 | if (progress && need_resched()) { |
2835 | memcpy(&key, &found_key, sizeof(key)); | |
2836 | mutex_unlock(&root->fs_info->fs_mutex); | |
2837 | cond_resched(); | |
2838 | mutex_lock(&root->fs_info->fs_mutex); | |
2839 | btrfs_release_path(root, path); | |
2840 | btrfs_search_slot(NULL, root, &key, path, 0, 0); | |
2841 | progress = 0; | |
2842 | goto next; | |
2843 | } | |
2844 | progress = 1; | |
2845 | ||
73e48b27 Y |
2846 | if (btrfs_key_type(&found_key) != BTRFS_EXTENT_ITEM_KEY || |
2847 | found_key.objectid + found_key.offset <= cur_byte) { | |
edbd8d4e | 2848 | path->slots[0]++; |
edbd8d4e CM |
2849 | goto next; |
2850 | } | |
73e48b27 | 2851 | |
edbd8d4e CM |
2852 | total_found++; |
2853 | cur_byte = found_key.objectid + found_key.offset; | |
2854 | key.objectid = cur_byte; | |
2855 | btrfs_release_path(root, path); | |
2856 | ret = relocate_one_extent(root, path, &found_key); | |
2857 | } | |
2858 | ||
2859 | btrfs_release_path(root, path); | |
2860 | ||
2861 | if (total_found > 0) { | |
2862 | trans = btrfs_start_transaction(tree_root, 1); | |
2863 | btrfs_commit_transaction(trans, tree_root); | |
2864 | ||
2865 | mutex_unlock(&root->fs_info->fs_mutex); | |
2866 | btrfs_clean_old_snapshots(tree_root); | |
2867 | mutex_lock(&root->fs_info->fs_mutex); | |
2868 | ||
2869 | trans = btrfs_start_transaction(tree_root, 1); | |
2870 | btrfs_commit_transaction(trans, tree_root); | |
2871 | goto again; | |
2872 | } | |
2873 | ||
8f18cf13 CM |
2874 | /* |
2875 | * we've freed all the extents, now remove the block | |
2876 | * group item from the tree | |
2877 | */ | |
edbd8d4e | 2878 | trans = btrfs_start_transaction(root, 1); |
8f18cf13 | 2879 | memcpy(&key, &shrink_block_group->key, sizeof(key)); |
1372f8e6 | 2880 | |
8f18cf13 CM |
2881 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); |
2882 | if (ret > 0) | |
2883 | ret = -EIO; | |
2884 | if (ret < 0) | |
2885 | goto out; | |
73e48b27 | 2886 | |
8f18cf13 CM |
2887 | leaf = path->nodes[0]; |
2888 | nritems = btrfs_header_nritems(leaf); | |
2889 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); | |
2890 | kfree(shrink_block_group); | |
edbd8d4e | 2891 | |
8f18cf13 CM |
2892 | clear_extent_bits(&info->block_group_cache, found_key.objectid, |
2893 | found_key.objectid + found_key.offset - 1, | |
2894 | (unsigned int)-1, GFP_NOFS); | |
edbd8d4e | 2895 | |
8f18cf13 CM |
2896 | btrfs_del_item(trans, root, path); |
2897 | clear_extent_dirty(&info->free_space_cache, | |
2898 | shrink_start, shrink_last_byte - 1, | |
edbd8d4e CM |
2899 | GFP_NOFS); |
2900 | btrfs_commit_transaction(trans, root); | |
2901 | out: | |
2902 | btrfs_free_path(path); | |
2903 | return ret; | |
2904 | } | |
2905 | ||
0b86a832 CM |
2906 | int find_first_block_group(struct btrfs_root *root, struct btrfs_path *path, |
2907 | struct btrfs_key *key) | |
2908 | { | |
2909 | int ret; | |
2910 | struct btrfs_key found_key; | |
2911 | struct extent_buffer *leaf; | |
2912 | int slot; | |
edbd8d4e | 2913 | |
0b86a832 CM |
2914 | ret = btrfs_search_slot(NULL, root, key, path, 0, 0); |
2915 | if (ret < 0) | |
2916 | return ret; | |
2917 | while(1) { | |
2918 | slot = path->slots[0]; | |
edbd8d4e | 2919 | leaf = path->nodes[0]; |
0b86a832 CM |
2920 | if (slot >= btrfs_header_nritems(leaf)) { |
2921 | ret = btrfs_next_leaf(root, path); | |
2922 | if (ret == 0) | |
2923 | continue; | |
2924 | if (ret < 0) | |
2925 | goto error; | |
2926 | break; | |
edbd8d4e | 2927 | } |
0b86a832 | 2928 | btrfs_item_key_to_cpu(leaf, &found_key, slot); |
edbd8d4e | 2929 | |
0b86a832 CM |
2930 | if (found_key.objectid >= key->objectid && |
2931 | found_key.type == BTRFS_BLOCK_GROUP_ITEM_KEY) | |
2932 | return 0; | |
2933 | path->slots[0]++; | |
edbd8d4e | 2934 | } |
0b86a832 CM |
2935 | ret = -ENOENT; |
2936 | error: | |
2937 | return ret; | |
edbd8d4e CM |
2938 | } |
2939 | ||
9078a3e1 CM |
2940 | int btrfs_read_block_groups(struct btrfs_root *root) |
2941 | { | |
2942 | struct btrfs_path *path; | |
2943 | int ret; | |
96b5179d | 2944 | int bit; |
9078a3e1 | 2945 | struct btrfs_block_group_cache *cache; |
be744175 | 2946 | struct btrfs_fs_info *info = root->fs_info; |
6324fbf3 | 2947 | struct btrfs_space_info *space_info; |
d1310b2e | 2948 | struct extent_io_tree *block_group_cache; |
9078a3e1 CM |
2949 | struct btrfs_key key; |
2950 | struct btrfs_key found_key; | |
5f39d397 | 2951 | struct extent_buffer *leaf; |
96b5179d CM |
2952 | |
2953 | block_group_cache = &info->block_group_cache; | |
be744175 | 2954 | root = info->extent_root; |
9078a3e1 | 2955 | key.objectid = 0; |
0b86a832 | 2956 | key.offset = 0; |
9078a3e1 | 2957 | btrfs_set_key_type(&key, BTRFS_BLOCK_GROUP_ITEM_KEY); |
9078a3e1 CM |
2958 | path = btrfs_alloc_path(); |
2959 | if (!path) | |
2960 | return -ENOMEM; | |
2961 | ||
2962 | while(1) { | |
0b86a832 CM |
2963 | ret = find_first_block_group(root, path, &key); |
2964 | if (ret > 0) { | |
2965 | ret = 0; | |
2966 | goto error; | |
9078a3e1 | 2967 | } |
0b86a832 CM |
2968 | if (ret != 0) |
2969 | goto error; | |
2970 | ||
5f39d397 CM |
2971 | leaf = path->nodes[0]; |
2972 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); | |
8f18cf13 | 2973 | cache = kzalloc(sizeof(*cache), GFP_NOFS); |
9078a3e1 | 2974 | if (!cache) { |
0b86a832 | 2975 | ret = -ENOMEM; |
9078a3e1 CM |
2976 | break; |
2977 | } | |
3e1ad54f | 2978 | |
5f39d397 CM |
2979 | read_extent_buffer(leaf, &cache->item, |
2980 | btrfs_item_ptr_offset(leaf, path->slots[0]), | |
2981 | sizeof(cache->item)); | |
9078a3e1 | 2982 | memcpy(&cache->key, &found_key, sizeof(found_key)); |
0b86a832 | 2983 | |
9078a3e1 CM |
2984 | key.objectid = found_key.objectid + found_key.offset; |
2985 | btrfs_release_path(root, path); | |
0b86a832 CM |
2986 | cache->flags = btrfs_block_group_flags(&cache->item); |
2987 | bit = 0; | |
2988 | if (cache->flags & BTRFS_BLOCK_GROUP_DATA) { | |
96b5179d | 2989 | bit = BLOCK_GROUP_DATA; |
0b86a832 CM |
2990 | } else if (cache->flags & BTRFS_BLOCK_GROUP_SYSTEM) { |
2991 | bit = BLOCK_GROUP_SYSTEM; | |
2992 | } else if (cache->flags & BTRFS_BLOCK_GROUP_METADATA) { | |
96b5179d | 2993 | bit = BLOCK_GROUP_METADATA; |
31f3c99b | 2994 | } |
8790d502 | 2995 | set_avail_alloc_bits(info, cache->flags); |
96b5179d | 2996 | |
6324fbf3 CM |
2997 | ret = update_space_info(info, cache->flags, found_key.offset, |
2998 | btrfs_block_group_used(&cache->item), | |
2999 | &space_info); | |
3000 | BUG_ON(ret); | |
3001 | cache->space_info = space_info; | |
3002 | ||
96b5179d CM |
3003 | /* use EXTENT_LOCKED to prevent merging */ |
3004 | set_extent_bits(block_group_cache, found_key.objectid, | |
3005 | found_key.objectid + found_key.offset - 1, | |
3006 | bit | EXTENT_LOCKED, GFP_NOFS); | |
3007 | set_state_private(block_group_cache, found_key.objectid, | |
ae2f5411 | 3008 | (unsigned long)cache); |
96b5179d | 3009 | |
9078a3e1 | 3010 | if (key.objectid >= |
db94535d | 3011 | btrfs_super_total_bytes(&info->super_copy)) |
9078a3e1 CM |
3012 | break; |
3013 | } | |
0b86a832 CM |
3014 | ret = 0; |
3015 | error: | |
9078a3e1 | 3016 | btrfs_free_path(path); |
0b86a832 | 3017 | return ret; |
9078a3e1 | 3018 | } |
6324fbf3 CM |
3019 | |
3020 | int btrfs_make_block_group(struct btrfs_trans_handle *trans, | |
3021 | struct btrfs_root *root, u64 bytes_used, | |
e17cade2 | 3022 | u64 type, u64 chunk_objectid, u64 chunk_offset, |
6324fbf3 CM |
3023 | u64 size) |
3024 | { | |
3025 | int ret; | |
3026 | int bit = 0; | |
3027 | struct btrfs_root *extent_root; | |
3028 | struct btrfs_block_group_cache *cache; | |
3029 | struct extent_io_tree *block_group_cache; | |
3030 | ||
3031 | extent_root = root->fs_info->extent_root; | |
3032 | block_group_cache = &root->fs_info->block_group_cache; | |
3033 | ||
8f18cf13 | 3034 | cache = kzalloc(sizeof(*cache), GFP_NOFS); |
6324fbf3 | 3035 | BUG_ON(!cache); |
e17cade2 | 3036 | cache->key.objectid = chunk_offset; |
6324fbf3 | 3037 | cache->key.offset = size; |
e17cade2 | 3038 | |
6324fbf3 CM |
3039 | btrfs_set_key_type(&cache->key, BTRFS_BLOCK_GROUP_ITEM_KEY); |
3040 | memset(&cache->item, 0, sizeof(cache->item)); | |
3041 | btrfs_set_block_group_used(&cache->item, bytes_used); | |
6324fbf3 CM |
3042 | btrfs_set_block_group_chunk_objectid(&cache->item, chunk_objectid); |
3043 | cache->flags = type; | |
3044 | btrfs_set_block_group_flags(&cache->item, type); | |
3045 | ||
3046 | ret = update_space_info(root->fs_info, cache->flags, size, bytes_used, | |
3047 | &cache->space_info); | |
3048 | BUG_ON(ret); | |
3049 | ||
d18a2c44 | 3050 | bit = block_group_state_bits(type); |
e17cade2 CM |
3051 | set_extent_bits(block_group_cache, chunk_offset, |
3052 | chunk_offset + size - 1, | |
6324fbf3 | 3053 | bit | EXTENT_LOCKED, GFP_NOFS); |
6324fbf3 | 3054 | |
e17cade2 CM |
3055 | set_state_private(block_group_cache, chunk_offset, |
3056 | (unsigned long)cache); | |
6324fbf3 CM |
3057 | ret = btrfs_insert_item(trans, extent_root, &cache->key, &cache->item, |
3058 | sizeof(cache->item)); | |
3059 | BUG_ON(ret); | |
3060 | ||
3061 | finish_current_insert(trans, extent_root); | |
3062 | ret = del_pending_extents(trans, extent_root); | |
3063 | BUG_ON(ret); | |
d18a2c44 | 3064 | set_avail_alloc_bits(extent_root->fs_info, type); |
6324fbf3 CM |
3065 | return 0; |
3066 | } |