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