Commit | Line | Data |
---|---|---|
2e635a27 | 1 | #include <linux/module.h> |
fec577fb CM |
2 | #include "ctree.h" |
3 | #include "disk-io.h" | |
4 | #include "print-tree.h" | |
e089f05c | 5 | #include "transaction.h" |
fec577fb | 6 | |
e089f05c CM |
7 | static int find_free_extent(struct btrfs_trans_handle *trans, struct btrfs_root |
8 | *orig_root, u64 num_blocks, u64 search_start, u64 | |
be08c1b9 | 9 | search_end, struct btrfs_key *ins, int data); |
e089f05c CM |
10 | static int finish_current_insert(struct btrfs_trans_handle *trans, struct |
11 | btrfs_root *extent_root); | |
e20d96d6 CM |
12 | static int del_pending_extents(struct btrfs_trans_handle *trans, struct |
13 | btrfs_root *extent_root); | |
fec577fb | 14 | |
de428b63 CM |
15 | static void reada_extent_leaves(struct btrfs_root *root, |
16 | struct btrfs_path *path, u64 limit) | |
17 | { | |
18 | struct btrfs_node *node; | |
19 | int i; | |
20 | int nritems; | |
21 | u64 item_objectid; | |
22 | u64 blocknr; | |
23 | int slot; | |
24 | int ret; | |
25 | ||
26 | if (!path->nodes[1]) | |
27 | return; | |
28 | node = btrfs_buffer_node(path->nodes[1]); | |
29 | slot = path->slots[1] + 1; | |
30 | nritems = btrfs_header_nritems(&node->header); | |
31 | for (i = slot; i < nritems && i < slot + 8; i++) { | |
32 | item_objectid = btrfs_disk_key_objectid(&node->ptrs[i].key); | |
33 | if (item_objectid > limit) | |
34 | break; | |
35 | blocknr = btrfs_node_blockptr(node, i); | |
36 | ret = readahead_tree_block(root, blocknr); | |
37 | if (ret) | |
38 | break; | |
39 | } | |
40 | } | |
41 | ||
e37c9e69 CM |
42 | static int cache_block_group(struct btrfs_root *root, |
43 | struct btrfs_block_group_cache *block_group) | |
44 | { | |
45 | struct btrfs_path *path; | |
46 | int ret; | |
47 | struct btrfs_key key; | |
48 | struct btrfs_leaf *leaf; | |
49 | struct radix_tree_root *extent_radix; | |
50 | int slot; | |
51 | u64 i; | |
52 | u64 last = 0; | |
53 | u64 hole_size; | |
de428b63 | 54 | u64 limit; |
e37c9e69 CM |
55 | int found = 0; |
56 | ||
57 | root = root->fs_info->extent_root; | |
58 | extent_radix = &root->fs_info->extent_map_radix; | |
59 | ||
60 | if (block_group->cached) | |
61 | return 0; | |
62 | if (block_group->data) | |
63 | return 0; | |
64 | path = btrfs_alloc_path(); | |
65 | if (!path) | |
66 | return -ENOMEM; | |
67 | printk("cache block group %Lu\n", block_group->key.objectid); | |
68 | key.objectid = block_group->key.objectid; | |
69 | key.flags = 0; | |
70 | key.offset = 0; | |
71 | btrfs_set_key_type(&key, BTRFS_EXTENT_ITEM_KEY); | |
72 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); | |
73 | if (ret < 0) | |
74 | return ret; | |
75 | if (ret && path->slots[0] > 0) | |
76 | path->slots[0]--; | |
de428b63 CM |
77 | limit = block_group->key.objectid + block_group->key.offset; |
78 | reada_extent_leaves(root, path, limit); | |
e37c9e69 CM |
79 | while(1) { |
80 | leaf = btrfs_buffer_leaf(path->nodes[0]); | |
81 | slot = path->slots[0]; | |
82 | if (slot >= btrfs_header_nritems(&leaf->header)) { | |
de428b63 | 83 | reada_extent_leaves(root, path, limit); |
e37c9e69 | 84 | ret = btrfs_next_leaf(root, path); |
de428b63 | 85 | if (ret == 0) { |
e37c9e69 | 86 | continue; |
de428b63 | 87 | } else { |
e37c9e69 CM |
88 | if (found) { |
89 | hole_size = block_group->key.objectid + | |
90 | block_group->key.offset - last; | |
91 | } else { | |
92 | last = block_group->key.objectid; | |
93 | hole_size = block_group->key.offset; | |
94 | } | |
95 | for (i = 0; i < hole_size; i++) { | |
96 | set_radix_bit(extent_radix, | |
97 | last + i); | |
98 | } | |
99 | break; | |
100 | } | |
101 | } | |
102 | btrfs_disk_key_to_cpu(&key, &leaf->items[slot].key); | |
103 | if (key.objectid >= block_group->key.objectid + | |
104 | block_group->key.offset) { | |
105 | if (found) { | |
106 | hole_size = block_group->key.objectid + | |
107 | block_group->key.offset - last; | |
108 | } else { | |
109 | last = block_group->key.objectid; | |
110 | hole_size = block_group->key.offset; | |
111 | } | |
112 | for (i = 0; i < hole_size; i++) { | |
113 | set_radix_bit(extent_radix, last + i); | |
114 | } | |
115 | break; | |
116 | } | |
117 | if (btrfs_key_type(&key) == BTRFS_EXTENT_ITEM_KEY) { | |
118 | if (!found) { | |
119 | last = key.objectid + key.offset; | |
120 | found = 1; | |
121 | } else { | |
122 | hole_size = key.objectid - last; | |
123 | for (i = 0; i < hole_size; i++) { | |
124 | set_radix_bit(extent_radix, last + i); | |
125 | } | |
126 | last = key.objectid + key.offset; | |
127 | } | |
128 | } | |
129 | path->slots[0]++; | |
130 | } | |
131 | ||
132 | block_group->cached = 1; | |
133 | btrfs_free_path(path); | |
134 | return 0; | |
135 | } | |
136 | ||
be744175 CM |
137 | static struct btrfs_block_group_cache *lookup_block_group(struct |
138 | btrfs_fs_info *info, | |
139 | u64 blocknr) | |
140 | { | |
141 | struct btrfs_block_group_cache *block_group; | |
142 | int ret; | |
143 | ||
144 | ret = radix_tree_gang_lookup(&info->block_group_radix, | |
145 | (void **)&block_group, | |
146 | blocknr, 1); | |
147 | if (ret) { | |
3e1ad54f | 148 | if (block_group->key.objectid <= blocknr && blocknr <= |
be744175 CM |
149 | block_group->key.objectid + block_group->key.offset) |
150 | return block_group; | |
151 | } | |
152 | ret = radix_tree_gang_lookup(&info->block_group_data_radix, | |
153 | (void **)&block_group, | |
154 | blocknr, 1); | |
155 | if (ret) { | |
3e1ad54f | 156 | if (block_group->key.objectid <= blocknr && blocknr <= |
be744175 CM |
157 | block_group->key.objectid + block_group->key.offset) |
158 | return block_group; | |
159 | } | |
3e1ad54f CM |
160 | WARN_ON(1); |
161 | printk("lookup_block_group fails for blocknr %Lu\n", blocknr); | |
162 | printk("last ret was %d\n", ret); | |
163 | if (ret) { | |
164 | printk("last block group was %Lu %Lu\n", block_group->key.objectid, block_group->key.offset); | |
165 | } | |
be744175 CM |
166 | return NULL; |
167 | } | |
168 | ||
e37c9e69 CM |
169 | static u64 leaf_range(struct btrfs_root *root) |
170 | { | |
171 | u64 size = BTRFS_LEAF_DATA_SIZE(root); | |
172 | size = size / (sizeof(struct btrfs_extent_item) + | |
173 | sizeof(struct btrfs_item)); | |
174 | return size; | |
175 | } | |
176 | ||
177 | static u64 find_search_start(struct btrfs_root *root, | |
178 | struct btrfs_block_group_cache **cache_ret, | |
179 | u64 search_start, int num) | |
180 | { | |
181 | unsigned long gang[8]; | |
182 | int ret; | |
183 | struct btrfs_block_group_cache *cache = *cache_ret; | |
184 | u64 last = max(search_start, cache->key.objectid); | |
185 | ||
186 | if (cache->data) | |
187 | goto out; | |
188 | if (num > 1) { | |
189 | last = max(last, cache->last_prealloc); | |
190 | } | |
191 | again: | |
192 | cache_block_group(root, cache); | |
193 | while(1) { | |
194 | ret = find_first_radix_bit(&root->fs_info->extent_map_radix, | |
195 | gang, last, ARRAY_SIZE(gang)); | |
196 | if (!ret) | |
197 | goto out; | |
198 | last = gang[ret-1] + 1; | |
199 | if (num > 1) { | |
200 | if (ret != ARRAY_SIZE(gang)) { | |
201 | goto new_group; | |
202 | } | |
203 | if (gang[ret-1] - gang[0] > leaf_range(root)) { | |
204 | continue; | |
205 | } | |
206 | } | |
207 | if (gang[0] >= cache->key.objectid + cache->key.offset) { | |
208 | goto new_group; | |
209 | } | |
210 | return gang[0]; | |
211 | } | |
212 | out: | |
213 | return max(cache->last_alloc, search_start); | |
214 | ||
215 | new_group: | |
216 | cache = lookup_block_group(root->fs_info, last + cache->key.offset - 1); | |
217 | if (!cache) { | |
218 | return max((*cache_ret)->last_alloc, search_start); | |
219 | } | |
220 | cache = btrfs_find_block_group(root, cache, | |
de428b63 | 221 | last + cache->key.offset - 1, 0, 0); |
e37c9e69 CM |
222 | *cache_ret = cache; |
223 | goto again; | |
224 | } | |
225 | ||
31f3c99b CM |
226 | struct btrfs_block_group_cache *btrfs_find_block_group(struct btrfs_root *root, |
227 | struct btrfs_block_group_cache | |
be744175 | 228 | *hint, u64 search_start, |
de428b63 | 229 | int data, int owner) |
cd1bc465 CM |
230 | { |
231 | struct btrfs_block_group_cache *cache[8]; | |
31f3c99b | 232 | struct btrfs_block_group_cache *found_group = NULL; |
cd1bc465 | 233 | struct btrfs_fs_info *info = root->fs_info; |
be744175 | 234 | struct radix_tree_root *radix; |
cd1bc465 | 235 | u64 used; |
31f3c99b CM |
236 | u64 last = 0; |
237 | u64 hint_last; | |
cd1bc465 CM |
238 | int i; |
239 | int ret; | |
31f3c99b | 240 | int full_search = 0; |
de428b63 CM |
241 | int factor = 8; |
242 | ||
243 | if (!owner) | |
244 | factor = 5; | |
be744175 CM |
245 | |
246 | if (data) | |
247 | radix = &info->block_group_data_radix; | |
248 | else | |
249 | radix = &info->block_group_radix; | |
250 | ||
251 | if (search_start) { | |
252 | struct btrfs_block_group_cache *shint; | |
253 | shint = lookup_block_group(info, search_start); | |
254 | if (shint->data == data) { | |
255 | used = btrfs_block_group_used(&shint->item); | |
256 | if (used + shint->pinned < | |
de428b63 | 257 | (shint->key.offset * factor) / 10) { |
be744175 CM |
258 | return shint; |
259 | } | |
260 | } | |
261 | } | |
262 | if (hint && hint->data == data) { | |
31f3c99b | 263 | used = btrfs_block_group_used(&hint->item); |
de428b63 | 264 | if (used + hint->pinned < (hint->key.offset * factor) / 10) { |
31f3c99b CM |
265 | return hint; |
266 | } | |
be744175 CM |
267 | if (used >= (hint->key.offset * 8) / 10) { |
268 | radix_tree_tag_clear(radix, | |
269 | hint->key.objectid + | |
270 | hint->key.offset - 1, | |
271 | BTRFS_BLOCK_GROUP_AVAIL); | |
272 | } | |
8d7be552 | 273 | last = hint->key.offset * 3; |
be744175 | 274 | if (hint->key.objectid >= last) |
e37c9e69 CM |
275 | last = max(search_start + hint->key.offset - 1, |
276 | hint->key.objectid - last); | |
be744175 CM |
277 | else |
278 | last = hint->key.objectid + hint->key.offset; | |
31f3c99b CM |
279 | hint_last = last; |
280 | } else { | |
e37c9e69 CM |
281 | if (hint) |
282 | hint_last = max(hint->key.objectid, search_start); | |
283 | else | |
284 | hint_last = search_start; | |
285 | ||
286 | last = hint_last; | |
31f3c99b | 287 | } |
cd1bc465 | 288 | while(1) { |
be744175 | 289 | ret = radix_tree_gang_lookup_tag(radix, (void **)cache, |
cd1bc465 | 290 | last, ARRAY_SIZE(cache), |
31f3c99b | 291 | BTRFS_BLOCK_GROUP_AVAIL); |
cd1bc465 CM |
292 | if (!ret) |
293 | break; | |
294 | for (i = 0; i < ret; i++) { | |
be08c1b9 CM |
295 | last = cache[i]->key.objectid + |
296 | cache[i]->key.offset; | |
cd1bc465 | 297 | used = btrfs_block_group_used(&cache[i]->item); |
be744175 | 298 | if (used + cache[i]->pinned < |
de428b63 | 299 | (cache[i]->key.offset * factor) / 10) { |
31f3c99b CM |
300 | found_group = cache[i]; |
301 | goto found; | |
cd1bc465 | 302 | } |
be744175 CM |
303 | if (used >= (cache[i]->key.offset * 8) / 10) { |
304 | radix_tree_tag_clear(radix, | |
305 | cache[i]->key.objectid + | |
306 | cache[i]->key.offset - 1, | |
307 | BTRFS_BLOCK_GROUP_AVAIL); | |
308 | } | |
cd1bc465 | 309 | } |
de428b63 | 310 | cond_resched(); |
cd1bc465 | 311 | } |
31f3c99b CM |
312 | last = hint_last; |
313 | again: | |
cd1bc465 | 314 | while(1) { |
be744175 CM |
315 | ret = radix_tree_gang_lookup(radix, (void **)cache, |
316 | last, ARRAY_SIZE(cache)); | |
cd1bc465 CM |
317 | if (!ret) |
318 | break; | |
319 | for (i = 0; i < ret; i++) { | |
be08c1b9 CM |
320 | last = cache[i]->key.objectid + |
321 | cache[i]->key.offset; | |
cd1bc465 | 322 | used = btrfs_block_group_used(&cache[i]->item); |
be744175 | 323 | if (used + cache[i]->pinned < cache[i]->key.offset) { |
31f3c99b CM |
324 | found_group = cache[i]; |
325 | goto found; | |
cd1bc465 | 326 | } |
be744175 CM |
327 | if (used >= cache[i]->key.offset) { |
328 | radix_tree_tag_clear(radix, | |
329 | cache[i]->key.objectid + | |
330 | cache[i]->key.offset - 1, | |
331 | BTRFS_BLOCK_GROUP_AVAIL); | |
332 | } | |
cd1bc465 | 333 | } |
de428b63 | 334 | cond_resched(); |
cd1bc465 | 335 | } |
31f3c99b | 336 | if (!full_search) { |
de428b63 | 337 | printk("find block group doing full search data %d start %Lu\n", data, search_start); |
be744175 | 338 | last = search_start; |
31f3c99b CM |
339 | full_search = 1; |
340 | goto again; | |
341 | } | |
31f3c99b | 342 | if (!found_group) { |
de428b63 | 343 | printk("find block group bailing to zero data %d\n", data); |
be744175 | 344 | ret = radix_tree_gang_lookup(radix, |
31f3c99b CM |
345 | (void **)&found_group, 0, 1); |
346 | BUG_ON(ret != 1); | |
347 | } | |
be744175 | 348 | found: |
31f3c99b | 349 | return found_group; |
cd1bc465 CM |
350 | } |
351 | ||
b18c6685 CM |
352 | int btrfs_inc_extent_ref(struct btrfs_trans_handle *trans, |
353 | struct btrfs_root *root, | |
354 | u64 blocknr, u64 num_blocks) | |
02217ed2 | 355 | { |
5caf2a00 | 356 | struct btrfs_path *path; |
02217ed2 | 357 | int ret; |
e2fa7227 | 358 | struct btrfs_key key; |
234b63a0 CM |
359 | struct btrfs_leaf *l; |
360 | struct btrfs_extent_item *item; | |
e2fa7227 | 361 | struct btrfs_key ins; |
cf27e1ee | 362 | u32 refs; |
037e6390 | 363 | |
9f5fae2f | 364 | find_free_extent(trans, root->fs_info->extent_root, 0, 0, (u64)-1, |
be08c1b9 | 365 | &ins, 0); |
5caf2a00 CM |
366 | path = btrfs_alloc_path(); |
367 | BUG_ON(!path); | |
368 | btrfs_init_path(path); | |
02217ed2 CM |
369 | key.objectid = blocknr; |
370 | key.flags = 0; | |
62e2749e | 371 | btrfs_set_key_type(&key, BTRFS_EXTENT_ITEM_KEY); |
6407bf6d | 372 | key.offset = num_blocks; |
5caf2a00 | 373 | ret = btrfs_search_slot(trans, root->fs_info->extent_root, &key, path, |
9f5fae2f | 374 | 0, 1); |
a429e513 CM |
375 | if (ret != 0) { |
376 | printk("can't find block %Lu %Lu\n", blocknr, num_blocks); | |
a28ec197 | 377 | BUG(); |
a429e513 | 378 | } |
02217ed2 | 379 | BUG_ON(ret != 0); |
5caf2a00 CM |
380 | l = btrfs_buffer_leaf(path->nodes[0]); |
381 | item = btrfs_item_ptr(l, path->slots[0], struct btrfs_extent_item); | |
cf27e1ee CM |
382 | refs = btrfs_extent_refs(item); |
383 | btrfs_set_extent_refs(item, refs + 1); | |
5caf2a00 | 384 | btrfs_mark_buffer_dirty(path->nodes[0]); |
a28ec197 | 385 | |
5caf2a00 CM |
386 | btrfs_release_path(root->fs_info->extent_root, path); |
387 | btrfs_free_path(path); | |
9f5fae2f | 388 | finish_current_insert(trans, root->fs_info->extent_root); |
e20d96d6 | 389 | del_pending_extents(trans, root->fs_info->extent_root); |
02217ed2 CM |
390 | return 0; |
391 | } | |
392 | ||
b18c6685 CM |
393 | static int lookup_extent_ref(struct btrfs_trans_handle *trans, |
394 | struct btrfs_root *root, u64 blocknr, | |
395 | u64 num_blocks, u32 *refs) | |
a28ec197 | 396 | { |
5caf2a00 | 397 | struct btrfs_path *path; |
a28ec197 | 398 | int ret; |
e2fa7227 | 399 | struct btrfs_key key; |
234b63a0 CM |
400 | struct btrfs_leaf *l; |
401 | struct btrfs_extent_item *item; | |
5caf2a00 CM |
402 | |
403 | path = btrfs_alloc_path(); | |
404 | btrfs_init_path(path); | |
a28ec197 | 405 | key.objectid = blocknr; |
6407bf6d | 406 | key.offset = num_blocks; |
62e2749e CM |
407 | key.flags = 0; |
408 | btrfs_set_key_type(&key, BTRFS_EXTENT_ITEM_KEY); | |
5caf2a00 | 409 | ret = btrfs_search_slot(trans, root->fs_info->extent_root, &key, path, |
9f5fae2f | 410 | 0, 0); |
a28ec197 CM |
411 | if (ret != 0) |
412 | BUG(); | |
5caf2a00 CM |
413 | l = btrfs_buffer_leaf(path->nodes[0]); |
414 | item = btrfs_item_ptr(l, path->slots[0], struct btrfs_extent_item); | |
cf27e1ee | 415 | *refs = btrfs_extent_refs(item); |
5caf2a00 CM |
416 | btrfs_release_path(root->fs_info->extent_root, path); |
417 | btrfs_free_path(path); | |
a28ec197 CM |
418 | return 0; |
419 | } | |
420 | ||
c5739bba CM |
421 | int btrfs_inc_root_ref(struct btrfs_trans_handle *trans, |
422 | struct btrfs_root *root) | |
423 | { | |
b18c6685 | 424 | return btrfs_inc_extent_ref(trans, root, bh_blocknr(root->node), 1); |
c5739bba CM |
425 | } |
426 | ||
e089f05c | 427 | int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root, |
e20d96d6 | 428 | struct buffer_head *buf) |
02217ed2 CM |
429 | { |
430 | u64 blocknr; | |
e20d96d6 | 431 | struct btrfs_node *buf_node; |
6407bf6d CM |
432 | struct btrfs_leaf *buf_leaf; |
433 | struct btrfs_disk_key *key; | |
434 | struct btrfs_file_extent_item *fi; | |
02217ed2 | 435 | int i; |
6407bf6d CM |
436 | int leaf; |
437 | int ret; | |
a28ec197 | 438 | |
3768f368 | 439 | if (!root->ref_cows) |
a28ec197 | 440 | return 0; |
e20d96d6 | 441 | buf_node = btrfs_buffer_node(buf); |
6407bf6d CM |
442 | leaf = btrfs_is_leaf(buf_node); |
443 | buf_leaf = btrfs_buffer_leaf(buf); | |
e20d96d6 | 444 | for (i = 0; i < btrfs_header_nritems(&buf_node->header); i++) { |
6407bf6d CM |
445 | if (leaf) { |
446 | key = &buf_leaf->items[i].key; | |
447 | if (btrfs_disk_key_type(key) != BTRFS_EXTENT_DATA_KEY) | |
448 | continue; | |
449 | fi = btrfs_item_ptr(buf_leaf, i, | |
450 | struct btrfs_file_extent_item); | |
236454df CM |
451 | if (btrfs_file_extent_type(fi) == |
452 | BTRFS_FILE_EXTENT_INLINE) | |
453 | continue; | |
b18c6685 | 454 | ret = btrfs_inc_extent_ref(trans, root, |
6407bf6d CM |
455 | btrfs_file_extent_disk_blocknr(fi), |
456 | btrfs_file_extent_disk_num_blocks(fi)); | |
457 | BUG_ON(ret); | |
458 | } else { | |
459 | blocknr = btrfs_node_blockptr(buf_node, i); | |
b18c6685 | 460 | ret = btrfs_inc_extent_ref(trans, root, blocknr, 1); |
6407bf6d CM |
461 | BUG_ON(ret); |
462 | } | |
02217ed2 CM |
463 | } |
464 | return 0; | |
465 | } | |
466 | ||
9078a3e1 CM |
467 | static int write_one_cache_group(struct btrfs_trans_handle *trans, |
468 | struct btrfs_root *root, | |
469 | struct btrfs_path *path, | |
470 | struct btrfs_block_group_cache *cache) | |
471 | { | |
472 | int ret; | |
473 | int pending_ret; | |
474 | struct btrfs_root *extent_root = root->fs_info->extent_root; | |
475 | struct btrfs_block_group_item *bi; | |
476 | struct btrfs_key ins; | |
477 | ||
be08c1b9 | 478 | find_free_extent(trans, extent_root, 0, 0, (u64)-1, &ins, 0); |
9078a3e1 CM |
479 | ret = btrfs_search_slot(trans, extent_root, &cache->key, path, 0, 1); |
480 | BUG_ON(ret); | |
481 | bi = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]), path->slots[0], | |
482 | struct btrfs_block_group_item); | |
483 | memcpy(bi, &cache->item, sizeof(*bi)); | |
484 | mark_buffer_dirty(path->nodes[0]); | |
485 | btrfs_release_path(extent_root, path); | |
486 | ||
487 | finish_current_insert(trans, extent_root); | |
488 | pending_ret = del_pending_extents(trans, extent_root); | |
489 | if (ret) | |
490 | return ret; | |
491 | if (pending_ret) | |
492 | return pending_ret; | |
be744175 CM |
493 | if (cache->data) |
494 | cache->last_alloc = cache->first_free; | |
9078a3e1 CM |
495 | return 0; |
496 | ||
497 | } | |
498 | ||
be744175 CM |
499 | static int write_dirty_block_radix(struct btrfs_trans_handle *trans, |
500 | struct btrfs_root *root, | |
501 | struct radix_tree_root *radix) | |
9078a3e1 CM |
502 | { |
503 | struct btrfs_block_group_cache *cache[8]; | |
504 | int ret; | |
505 | int err = 0; | |
506 | int werr = 0; | |
9078a3e1 CM |
507 | int i; |
508 | struct btrfs_path *path; | |
509 | ||
510 | path = btrfs_alloc_path(); | |
511 | if (!path) | |
512 | return -ENOMEM; | |
513 | ||
514 | while(1) { | |
515 | ret = radix_tree_gang_lookup_tag(radix, (void **)cache, | |
516 | 0, ARRAY_SIZE(cache), | |
517 | BTRFS_BLOCK_GROUP_DIRTY); | |
518 | if (!ret) | |
519 | break; | |
520 | for (i = 0; i < ret; i++) { | |
521 | radix_tree_tag_clear(radix, cache[i]->key.objectid + | |
522 | cache[i]->key.offset - 1, | |
523 | BTRFS_BLOCK_GROUP_DIRTY); | |
524 | err = write_one_cache_group(trans, root, | |
525 | path, cache[i]); | |
526 | if (err) | |
527 | werr = err; | |
528 | } | |
529 | } | |
530 | btrfs_free_path(path); | |
531 | return werr; | |
532 | } | |
533 | ||
be744175 CM |
534 | int btrfs_write_dirty_block_groups(struct btrfs_trans_handle *trans, |
535 | struct btrfs_root *root) | |
536 | { | |
537 | int ret; | |
538 | int ret2; | |
539 | ret = write_dirty_block_radix(trans, root, | |
540 | &root->fs_info->block_group_radix); | |
541 | ret2 = write_dirty_block_radix(trans, root, | |
542 | &root->fs_info->block_group_data_radix); | |
543 | if (ret) | |
544 | return ret; | |
545 | if (ret2) | |
546 | return ret2; | |
547 | return 0; | |
548 | } | |
549 | ||
9078a3e1 CM |
550 | static int update_block_group(struct btrfs_trans_handle *trans, |
551 | struct btrfs_root *root, | |
e37c9e69 | 552 | u64 blocknr, u64 num, int alloc, int mark_free) |
9078a3e1 CM |
553 | { |
554 | struct btrfs_block_group_cache *cache; | |
555 | struct btrfs_fs_info *info = root->fs_info; | |
556 | u64 total = num; | |
557 | u64 old_val; | |
558 | u64 block_in_group; | |
e37c9e69 | 559 | u64 i; |
3e1ad54f | 560 | |
9078a3e1 | 561 | while(total) { |
3e1ad54f CM |
562 | cache = lookup_block_group(info, blocknr); |
563 | if (!cache) { | |
cd1bc465 CM |
564 | printk(KERN_CRIT "blocknr %Lu lookup failed\n", |
565 | blocknr); | |
9078a3e1 | 566 | return -1; |
cd1bc465 | 567 | } |
9078a3e1 CM |
568 | block_in_group = blocknr - cache->key.objectid; |
569 | WARN_ON(block_in_group > cache->key.offset); | |
3e1ad54f | 570 | radix_tree_tag_set(cache->radix, cache->key.objectid + |
be744175 | 571 | cache->key.offset - 1, |
9078a3e1 CM |
572 | BTRFS_BLOCK_GROUP_DIRTY); |
573 | ||
574 | old_val = btrfs_block_group_used(&cache->item); | |
575 | num = min(total, cache->key.offset - block_in_group); | |
cd1bc465 | 576 | if (alloc) { |
9078a3e1 | 577 | old_val += num; |
cd1bc465 CM |
578 | if (blocknr > cache->last_alloc) |
579 | cache->last_alloc = blocknr; | |
e37c9e69 CM |
580 | if (!cache->data) { |
581 | for (i = 0; i < num; i++) { | |
582 | clear_radix_bit(&info->extent_map_radix, | |
583 | blocknr + i); | |
584 | } | |
585 | } | |
cd1bc465 | 586 | } else { |
9078a3e1 | 587 | old_val -= num; |
cd1bc465 CM |
588 | if (blocknr < cache->first_free) |
589 | cache->first_free = blocknr; | |
e37c9e69 CM |
590 | if (!cache->data && mark_free) { |
591 | for (i = 0; i < num; i++) { | |
592 | set_radix_bit(&info->extent_map_radix, | |
593 | blocknr + i); | |
594 | } | |
595 | } | |
de428b63 CM |
596 | if (old_val < (cache->key.offset * 5) / 10 && |
597 | old_val + num >= (cache->key.offset * 5) / 10) { | |
e37c9e69 CM |
598 | printk("group %Lu now available\n", cache->key.objectid); |
599 | radix_tree_tag_set(cache->radix, | |
600 | cache->key.objectid + | |
601 | cache->key.offset - 1, | |
602 | BTRFS_BLOCK_GROUP_AVAIL); | |
603 | } | |
cd1bc465 | 604 | } |
9078a3e1 | 605 | btrfs_set_block_group_used(&cache->item, old_val); |
e37c9e69 CM |
606 | total -= num; |
607 | blocknr += num; | |
9078a3e1 CM |
608 | } |
609 | return 0; | |
610 | } | |
611 | ||
be08c1b9 CM |
612 | static int try_remove_page(struct address_space *mapping, unsigned long index) |
613 | { | |
614 | int ret; | |
615 | ret = invalidate_mapping_pages(mapping, index, index); | |
616 | return ret; | |
617 | } | |
618 | ||
e089f05c CM |
619 | int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans, struct |
620 | btrfs_root *root) | |
a28ec197 | 621 | { |
8ef97622 | 622 | unsigned long gang[8]; |
be08c1b9 | 623 | struct inode *btree_inode = root->fs_info->btree_inode; |
be744175 | 624 | struct btrfs_block_group_cache *block_group; |
88fd146c | 625 | u64 first = 0; |
a28ec197 CM |
626 | int ret; |
627 | int i; | |
8ef97622 | 628 | struct radix_tree_root *pinned_radix = &root->fs_info->pinned_radix; |
e37c9e69 | 629 | struct radix_tree_root *extent_radix = &root->fs_info->extent_map_radix; |
a28ec197 CM |
630 | |
631 | while(1) { | |
e37c9e69 | 632 | ret = find_first_radix_bit(pinned_radix, gang, 0, |
8ef97622 | 633 | ARRAY_SIZE(gang)); |
a28ec197 CM |
634 | if (!ret) |
635 | break; | |
88fd146c | 636 | if (!first) |
8ef97622 | 637 | first = gang[0]; |
0579da42 | 638 | for (i = 0; i < ret; i++) { |
8ef97622 | 639 | clear_radix_bit(pinned_radix, gang[i]); |
be744175 CM |
640 | block_group = lookup_block_group(root->fs_info, |
641 | gang[i]); | |
642 | if (block_group) { | |
643 | WARN_ON(block_group->pinned == 0); | |
644 | block_group->pinned--; | |
645 | if (gang[i] < block_group->last_alloc) | |
646 | block_group->last_alloc = gang[i]; | |
e37c9e69 CM |
647 | if (gang[i] < block_group->last_prealloc) |
648 | block_group->last_prealloc = gang[i]; | |
649 | if (!block_group->data) | |
650 | set_radix_bit(extent_radix, gang[i]); | |
be744175 | 651 | } |
be08c1b9 CM |
652 | try_remove_page(btree_inode->i_mapping, |
653 | gang[i] << (PAGE_CACHE_SHIFT - | |
654 | btree_inode->i_blkbits)); | |
0579da42 | 655 | } |
a28ec197 CM |
656 | } |
657 | return 0; | |
658 | } | |
659 | ||
e089f05c CM |
660 | static int finish_current_insert(struct btrfs_trans_handle *trans, struct |
661 | btrfs_root *extent_root) | |
037e6390 | 662 | { |
e2fa7227 | 663 | struct btrfs_key ins; |
234b63a0 | 664 | struct btrfs_extent_item extent_item; |
037e6390 CM |
665 | int i; |
666 | int ret; | |
1261ec42 CM |
667 | u64 super_blocks_used; |
668 | struct btrfs_fs_info *info = extent_root->fs_info; | |
037e6390 | 669 | |
cf27e1ee | 670 | btrfs_set_extent_refs(&extent_item, 1); |
037e6390 CM |
671 | ins.offset = 1; |
672 | ins.flags = 0; | |
62e2749e | 673 | btrfs_set_key_type(&ins, BTRFS_EXTENT_ITEM_KEY); |
5d0c3e60 | 674 | btrfs_set_extent_owner(&extent_item, extent_root->root_key.objectid); |
037e6390 | 675 | |
f2458e1d CM |
676 | for (i = 0; i < extent_root->fs_info->extent_tree_insert_nr; i++) { |
677 | ins.objectid = extent_root->fs_info->extent_tree_insert[i]; | |
1261ec42 CM |
678 | super_blocks_used = btrfs_super_blocks_used(info->disk_super); |
679 | btrfs_set_super_blocks_used(info->disk_super, | |
680 | super_blocks_used + 1); | |
e089f05c CM |
681 | ret = btrfs_insert_item(trans, extent_root, &ins, &extent_item, |
682 | sizeof(extent_item)); | |
037e6390 CM |
683 | BUG_ON(ret); |
684 | } | |
f2458e1d CM |
685 | extent_root->fs_info->extent_tree_insert_nr = 0; |
686 | extent_root->fs_info->extent_tree_prealloc_nr = 0; | |
037e6390 CM |
687 | return 0; |
688 | } | |
689 | ||
8ef97622 | 690 | static int pin_down_block(struct btrfs_root *root, u64 blocknr, int pending) |
e20d96d6 CM |
691 | { |
692 | int err; | |
78fae27e | 693 | struct btrfs_header *header; |
8ef97622 CM |
694 | struct buffer_head *bh; |
695 | ||
f4b9aa8d | 696 | if (!pending) { |
d98237b3 | 697 | bh = btrfs_find_tree_block(root, blocknr); |
2c90e5d6 CM |
698 | if (bh) { |
699 | if (buffer_uptodate(bh)) { | |
700 | u64 transid = | |
701 | root->fs_info->running_transaction->transid; | |
702 | header = btrfs_buffer_header(bh); | |
703 | if (btrfs_header_generation(header) == | |
704 | transid) { | |
705 | btrfs_block_release(root, bh); | |
706 | return 0; | |
707 | } | |
f4b9aa8d | 708 | } |
d6025579 | 709 | btrfs_block_release(root, bh); |
8ef97622 | 710 | } |
8ef97622 | 711 | err = set_radix_bit(&root->fs_info->pinned_radix, blocknr); |
be744175 CM |
712 | if (!err) { |
713 | struct btrfs_block_group_cache *cache; | |
714 | cache = lookup_block_group(root->fs_info, blocknr); | |
715 | if (cache) | |
716 | cache->pinned++; | |
717 | } | |
f4b9aa8d CM |
718 | } else { |
719 | err = set_radix_bit(&root->fs_info->pending_del_radix, blocknr); | |
720 | } | |
be744175 | 721 | BUG_ON(err < 0); |
e20d96d6 CM |
722 | return 0; |
723 | } | |
724 | ||
fec577fb | 725 | /* |
a28ec197 | 726 | * remove an extent from the root, returns 0 on success |
fec577fb | 727 | */ |
e089f05c | 728 | static int __free_extent(struct btrfs_trans_handle *trans, struct btrfs_root |
e37c9e69 CM |
729 | *root, u64 blocknr, u64 num_blocks, int pin, |
730 | int mark_free) | |
a28ec197 | 731 | { |
5caf2a00 | 732 | struct btrfs_path *path; |
e2fa7227 | 733 | struct btrfs_key key; |
1261ec42 CM |
734 | struct btrfs_fs_info *info = root->fs_info; |
735 | struct btrfs_root *extent_root = info->extent_root; | |
a28ec197 | 736 | int ret; |
234b63a0 | 737 | struct btrfs_extent_item *ei; |
e2fa7227 | 738 | struct btrfs_key ins; |
cf27e1ee | 739 | u32 refs; |
037e6390 | 740 | |
a28ec197 CM |
741 | key.objectid = blocknr; |
742 | key.flags = 0; | |
62e2749e | 743 | btrfs_set_key_type(&key, BTRFS_EXTENT_ITEM_KEY); |
a28ec197 CM |
744 | key.offset = num_blocks; |
745 | ||
be08c1b9 | 746 | find_free_extent(trans, root, 0, 0, (u64)-1, &ins, 0); |
5caf2a00 CM |
747 | path = btrfs_alloc_path(); |
748 | BUG_ON(!path); | |
749 | btrfs_init_path(path); | |
5f26f772 | 750 | |
5caf2a00 | 751 | ret = btrfs_search_slot(trans, extent_root, &key, path, -1, 1); |
a28ec197 | 752 | if (ret) { |
2e635a27 | 753 | printk("failed to find %Lu\n", key.objectid); |
234b63a0 | 754 | btrfs_print_tree(extent_root, extent_root->node); |
2e635a27 | 755 | printk("failed to find %Lu\n", key.objectid); |
a28ec197 CM |
756 | BUG(); |
757 | } | |
5caf2a00 | 758 | ei = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]), path->slots[0], |
123abc88 | 759 | struct btrfs_extent_item); |
a28ec197 | 760 | BUG_ON(ei->refs == 0); |
cf27e1ee CM |
761 | refs = btrfs_extent_refs(ei) - 1; |
762 | btrfs_set_extent_refs(ei, refs); | |
5caf2a00 | 763 | btrfs_mark_buffer_dirty(path->nodes[0]); |
cf27e1ee | 764 | if (refs == 0) { |
1261ec42 | 765 | u64 super_blocks_used; |
78fae27e CM |
766 | |
767 | if (pin) { | |
8ef97622 | 768 | ret = pin_down_block(root, blocknr, 0); |
78fae27e CM |
769 | BUG_ON(ret); |
770 | } | |
771 | ||
1261ec42 CM |
772 | super_blocks_used = btrfs_super_blocks_used(info->disk_super); |
773 | btrfs_set_super_blocks_used(info->disk_super, | |
774 | super_blocks_used - num_blocks); | |
5caf2a00 | 775 | ret = btrfs_del_item(trans, extent_root, path); |
a28ec197 CM |
776 | if (ret) |
777 | BUG(); | |
e37c9e69 CM |
778 | ret = update_block_group(trans, root, blocknr, num_blocks, 0, |
779 | mark_free); | |
9078a3e1 | 780 | BUG_ON(ret); |
a28ec197 | 781 | } |
5caf2a00 | 782 | btrfs_free_path(path); |
e089f05c | 783 | finish_current_insert(trans, extent_root); |
a28ec197 CM |
784 | return ret; |
785 | } | |
786 | ||
a28ec197 CM |
787 | /* |
788 | * find all the blocks marked as pending in the radix tree and remove | |
789 | * them from the extent map | |
790 | */ | |
e089f05c CM |
791 | static int del_pending_extents(struct btrfs_trans_handle *trans, struct |
792 | btrfs_root *extent_root) | |
a28ec197 CM |
793 | { |
794 | int ret; | |
e20d96d6 CM |
795 | int wret; |
796 | int err = 0; | |
8ef97622 | 797 | unsigned long gang[4]; |
a28ec197 | 798 | int i; |
8ef97622 CM |
799 | struct radix_tree_root *pending_radix; |
800 | struct radix_tree_root *pinned_radix; | |
be744175 | 801 | struct btrfs_block_group_cache *cache; |
8ef97622 CM |
802 | |
803 | pending_radix = &extent_root->fs_info->pending_del_radix; | |
804 | pinned_radix = &extent_root->fs_info->pinned_radix; | |
a28ec197 CM |
805 | |
806 | while(1) { | |
e37c9e69 | 807 | ret = find_first_radix_bit(pending_radix, gang, 0, |
8ef97622 | 808 | ARRAY_SIZE(gang)); |
a28ec197 CM |
809 | if (!ret) |
810 | break; | |
811 | for (i = 0; i < ret; i++) { | |
8ef97622 | 812 | wret = set_radix_bit(pinned_radix, gang[i]); |
be744175 CM |
813 | if (wret == 0) { |
814 | cache = lookup_block_group(extent_root->fs_info, | |
815 | gang[i]); | |
816 | if (cache) | |
817 | cache->pinned++; | |
818 | } | |
819 | if (wret < 0) { | |
820 | printk(KERN_CRIT "set_radix_bit, err %d\n", | |
821 | wret); | |
822 | BUG_ON(wret < 0); | |
823 | } | |
8ef97622 CM |
824 | wret = clear_radix_bit(pending_radix, gang[i]); |
825 | BUG_ON(wret); | |
d5719762 | 826 | wret = __free_extent(trans, extent_root, |
e37c9e69 | 827 | gang[i], 1, 0, 0); |
e20d96d6 CM |
828 | if (wret) |
829 | err = wret; | |
fec577fb CM |
830 | } |
831 | } | |
e20d96d6 | 832 | return err; |
fec577fb CM |
833 | } |
834 | ||
835 | /* | |
836 | * remove an extent from the root, returns 0 on success | |
837 | */ | |
e089f05c CM |
838 | int btrfs_free_extent(struct btrfs_trans_handle *trans, struct btrfs_root |
839 | *root, u64 blocknr, u64 num_blocks, int pin) | |
fec577fb | 840 | { |
9f5fae2f | 841 | struct btrfs_root *extent_root = root->fs_info->extent_root; |
fec577fb CM |
842 | int pending_ret; |
843 | int ret; | |
a28ec197 | 844 | |
fec577fb | 845 | if (root == extent_root) { |
8ef97622 | 846 | pin_down_block(root, blocknr, 1); |
fec577fb CM |
847 | return 0; |
848 | } | |
e37c9e69 | 849 | ret = __free_extent(trans, root, blocknr, num_blocks, pin, pin == 0); |
e20d96d6 | 850 | pending_ret = del_pending_extents(trans, root->fs_info->extent_root); |
fec577fb CM |
851 | return ret ? ret : pending_ret; |
852 | } | |
853 | ||
854 | /* | |
855 | * walks the btree of allocated extents and find a hole of a given size. | |
856 | * The key ins is changed to record the hole: | |
857 | * ins->objectid == block start | |
62e2749e | 858 | * ins->flags = BTRFS_EXTENT_ITEM_KEY |
fec577fb CM |
859 | * ins->offset == number of blocks |
860 | * Any available blocks before search_start are skipped. | |
861 | */ | |
e089f05c CM |
862 | static int find_free_extent(struct btrfs_trans_handle *trans, struct btrfs_root |
863 | *orig_root, u64 num_blocks, u64 search_start, u64 | |
be08c1b9 | 864 | search_end, struct btrfs_key *ins, int data) |
fec577fb | 865 | { |
5caf2a00 | 866 | struct btrfs_path *path; |
e2fa7227 | 867 | struct btrfs_key key; |
fec577fb CM |
868 | int ret; |
869 | u64 hole_size = 0; | |
870 | int slot = 0; | |
e20d96d6 | 871 | u64 last_block = 0; |
037e6390 | 872 | u64 test_block; |
be744175 | 873 | u64 orig_search_start = search_start; |
fec577fb | 874 | int start_found; |
234b63a0 | 875 | struct btrfs_leaf *l; |
9f5fae2f | 876 | struct btrfs_root * root = orig_root->fs_info->extent_root; |
f2458e1d | 877 | struct btrfs_fs_info *info = root->fs_info; |
0579da42 | 878 | int total_needed = num_blocks; |
f2458e1d CM |
879 | int total_found = 0; |
880 | int fill_prealloc = 0; | |
e20d96d6 | 881 | int level; |
be08c1b9 | 882 | struct btrfs_block_group_cache *block_group; |
be744175 | 883 | int full_scan = 0; |
de428b63 | 884 | u64 limit; |
fec577fb | 885 | |
b1a4d965 CM |
886 | path = btrfs_alloc_path(); |
887 | ins->flags = 0; | |
888 | btrfs_set_key_type(ins, BTRFS_EXTENT_ITEM_KEY); | |
889 | ||
e20d96d6 | 890 | level = btrfs_header_level(btrfs_buffer_header(root->node)); |
f2458e1d CM |
891 | if (num_blocks == 0) { |
892 | fill_prealloc = 1; | |
893 | num_blocks = 1; | |
308535a0 | 894 | total_needed = (min(level + 1, BTRFS_MAX_LEVEL) + 2) * 3; |
f2458e1d | 895 | } |
3e1ad54f CM |
896 | if (search_end == (u64)-1) |
897 | search_end = btrfs_super_total_blocks(info->disk_super); | |
be744175 CM |
898 | if (search_start) { |
899 | block_group = lookup_block_group(info, search_start); | |
900 | block_group = btrfs_find_block_group(root, block_group, | |
de428b63 | 901 | search_start, data, 1); |
be744175 CM |
902 | } else { |
903 | block_group = btrfs_find_block_group(root, | |
904 | trans->block_group, 0, | |
de428b63 | 905 | data, 1); |
be744175 CM |
906 | } |
907 | ||
908 | check_failed: | |
3e1ad54f | 909 | if (!full_scan && block_group->data != data) |
be744175 | 910 | WARN_ON(1); |
e37c9e69 CM |
911 | |
912 | if (!data) | |
913 | search_start = find_search_start(root, &block_group, | |
914 | search_start, total_needed); | |
915 | else | |
916 | search_start = max(block_group->last_alloc, search_start); | |
917 | ||
5caf2a00 | 918 | btrfs_init_path(path); |
fec577fb CM |
919 | ins->objectid = search_start; |
920 | ins->offset = 0; | |
fec577fb | 921 | start_found = 0; |
e37c9e69 | 922 | |
5caf2a00 | 923 | ret = btrfs_search_slot(trans, root, ins, path, 0, 0); |
0f70abe2 CM |
924 | if (ret < 0) |
925 | goto error; | |
aa5d6bed | 926 | |
e37c9e69 | 927 | if (path->slots[0] > 0) { |
5caf2a00 | 928 | path->slots[0]--; |
e37c9e69 CM |
929 | } |
930 | ||
931 | l = btrfs_buffer_leaf(path->nodes[0]); | |
932 | btrfs_disk_key_to_cpu(&key, &l->items[path->slots[0]].key); | |
933 | /* | |
934 | * a rare case, go back one key if we hit a block group item | |
935 | * instead of an extent item | |
936 | */ | |
937 | if (btrfs_key_type(&key) != BTRFS_EXTENT_ITEM_KEY && | |
938 | key.objectid + key.offset >= search_start) { | |
939 | ins->objectid = key.objectid; | |
940 | ins->offset = key.offset - 1; | |
941 | btrfs_release_path(root, path); | |
942 | ret = btrfs_search_slot(trans, root, ins, path, 0, 0); | |
943 | if (ret < 0) | |
944 | goto error; | |
945 | ||
946 | if (path->slots[0] > 0) { | |
947 | path->slots[0]--; | |
948 | } | |
949 | } | |
0579da42 | 950 | |
fec577fb | 951 | while (1) { |
5caf2a00 CM |
952 | l = btrfs_buffer_leaf(path->nodes[0]); |
953 | slot = path->slots[0]; | |
7518a238 | 954 | if (slot >= btrfs_header_nritems(&l->header)) { |
f2458e1d CM |
955 | if (fill_prealloc) { |
956 | info->extent_tree_prealloc_nr = 0; | |
957 | total_found = 0; | |
958 | } | |
de428b63 CM |
959 | if (start_found) |
960 | limit = last_block + | |
961 | block_group->key.offset / 2; | |
962 | else | |
963 | limit = search_start + | |
964 | block_group->key.offset / 2; | |
5caf2a00 | 965 | ret = btrfs_next_leaf(root, path); |
fec577fb CM |
966 | if (ret == 0) |
967 | continue; | |
0f70abe2 CM |
968 | if (ret < 0) |
969 | goto error; | |
fec577fb CM |
970 | if (!start_found) { |
971 | ins->objectid = search_start; | |
3e1ad54f | 972 | ins->offset = search_end - search_start; |
fec577fb CM |
973 | start_found = 1; |
974 | goto check_pending; | |
975 | } | |
976 | ins->objectid = last_block > search_start ? | |
977 | last_block : search_start; | |
3e1ad54f | 978 | ins->offset = search_end - ins->objectid; |
fec577fb CM |
979 | goto check_pending; |
980 | } | |
e37c9e69 | 981 | |
e2fa7227 | 982 | btrfs_disk_key_to_cpu(&key, &l->items[slot].key); |
e37c9e69 CM |
983 | if (key.objectid >= search_start && key.objectid > last_block && |
984 | start_found) { | |
985 | if (last_block < search_start) | |
986 | last_block = search_start; | |
987 | hole_size = key.objectid - last_block; | |
988 | if (hole_size >= num_blocks) { | |
989 | ins->objectid = last_block; | |
990 | ins->offset = hole_size; | |
991 | goto check_pending; | |
0579da42 | 992 | } |
fec577fb | 993 | } |
e37c9e69 CM |
994 | |
995 | if (btrfs_key_type(&key) != BTRFS_EXTENT_ITEM_KEY) | |
996 | goto next; | |
997 | ||
0579da42 | 998 | start_found = 1; |
e2fa7227 | 999 | last_block = key.objectid + key.offset; |
be744175 CM |
1000 | if (last_block >= block_group->key.objectid + |
1001 | block_group->key.offset) { | |
1002 | btrfs_release_path(root, path); | |
1003 | search_start = block_group->key.objectid + | |
1004 | block_group->key.offset * 2; | |
1005 | goto new_group; | |
1006 | } | |
9078a3e1 | 1007 | next: |
5caf2a00 | 1008 | path->slots[0]++; |
de428b63 | 1009 | cond_resched(); |
fec577fb CM |
1010 | } |
1011 | // FIXME -ENOSPC | |
1012 | check_pending: | |
1013 | /* we have to make sure we didn't find an extent that has already | |
1014 | * been allocated by the map tree or the original allocation | |
1015 | */ | |
5caf2a00 | 1016 | btrfs_release_path(root, path); |
fec577fb | 1017 | BUG_ON(ins->objectid < search_start); |
e37c9e69 | 1018 | |
3e1ad54f | 1019 | if (ins->objectid + num_blocks >= search_end) { |
be744175 | 1020 | if (full_scan) |
06a2f9fa | 1021 | return -ENOSPC; |
be744175 CM |
1022 | search_start = orig_search_start; |
1023 | full_scan = 1; | |
1024 | goto new_group; | |
06a2f9fa | 1025 | } |
037e6390 | 1026 | for (test_block = ins->objectid; |
f2458e1d CM |
1027 | test_block < ins->objectid + num_blocks; test_block++) { |
1028 | if (test_radix_bit(&info->pinned_radix, test_block)) { | |
037e6390 | 1029 | search_start = test_block + 1; |
be744175 | 1030 | goto new_group; |
fec577fb CM |
1031 | } |
1032 | } | |
f2458e1d CM |
1033 | if (!fill_prealloc && info->extent_tree_insert_nr) { |
1034 | u64 last = | |
1035 | info->extent_tree_insert[info->extent_tree_insert_nr - 1]; | |
1036 | if (ins->objectid + num_blocks > | |
1037 | info->extent_tree_insert[0] && | |
1038 | ins->objectid <= last) { | |
1039 | search_start = last + 1; | |
e37c9e69 | 1040 | WARN_ON(!full_scan); |
be744175 | 1041 | goto new_group; |
f2458e1d CM |
1042 | } |
1043 | } | |
1044 | if (!fill_prealloc && info->extent_tree_prealloc_nr) { | |
1045 | u64 first = | |
1046 | info->extent_tree_prealloc[info->extent_tree_prealloc_nr - 1]; | |
1047 | if (ins->objectid + num_blocks > first && | |
1048 | ins->objectid <= info->extent_tree_prealloc[0]) { | |
1049 | search_start = info->extent_tree_prealloc[0] + 1; | |
e37c9e69 | 1050 | WARN_ON(!full_scan); |
be744175 | 1051 | goto new_group; |
f2458e1d CM |
1052 | } |
1053 | } | |
1054 | if (fill_prealloc) { | |
1055 | int nr; | |
1056 | test_block = ins->objectid; | |
e37c9e69 CM |
1057 | if (test_block - info->extent_tree_prealloc[total_needed - 1] >= |
1058 | leaf_range(root)) { | |
1059 | total_found = 0; | |
1060 | info->extent_tree_prealloc_nr = total_found; | |
1061 | } | |
f2458e1d CM |
1062 | while(test_block < ins->objectid + ins->offset && |
1063 | total_found < total_needed) { | |
1064 | nr = total_needed - total_found - 1; | |
1065 | BUG_ON(nr < 0); | |
cd1bc465 | 1066 | info->extent_tree_prealloc[nr] = test_block; |
f2458e1d CM |
1067 | total_found++; |
1068 | test_block++; | |
1069 | } | |
1070 | if (total_found < total_needed) { | |
1071 | search_start = test_block; | |
be744175 | 1072 | goto new_group; |
f2458e1d | 1073 | } |
cd1bc465 CM |
1074 | info->extent_tree_prealloc_nr = total_found; |
1075 | } | |
e37c9e69 CM |
1076 | if (!data) { |
1077 | block_group = lookup_block_group(info, ins->objectid); | |
1078 | if (block_group) { | |
1079 | if (fill_prealloc) | |
1080 | block_group->last_prealloc = | |
1081 | info->extent_tree_prealloc[total_needed-1]; | |
1082 | else | |
1083 | trans->block_group = block_group; | |
1084 | } | |
f2458e1d | 1085 | } |
037e6390 | 1086 | ins->offset = num_blocks; |
5caf2a00 | 1087 | btrfs_free_path(path); |
fec577fb | 1088 | return 0; |
be744175 CM |
1089 | |
1090 | new_group: | |
3e1ad54f | 1091 | if (search_start + num_blocks >= search_end) { |
be744175 | 1092 | search_start = orig_search_start; |
e37c9e69 | 1093 | printk("doing full scan!\n"); |
be744175 CM |
1094 | full_scan = 1; |
1095 | } | |
1096 | block_group = lookup_block_group(info, search_start); | |
1097 | if (!full_scan) | |
1098 | block_group = btrfs_find_block_group(root, block_group, | |
de428b63 CM |
1099 | search_start, data, 0); |
1100 | cond_resched(); | |
be744175 CM |
1101 | goto check_failed; |
1102 | ||
0f70abe2 | 1103 | error: |
5caf2a00 CM |
1104 | btrfs_release_path(root, path); |
1105 | btrfs_free_path(path); | |
0f70abe2 | 1106 | return ret; |
fec577fb | 1107 | } |
fec577fb CM |
1108 | /* |
1109 | * finds a free extent and does all the dirty work required for allocation | |
1110 | * returns the key for the extent through ins, and a tree buffer for | |
1111 | * the first block of the extent through buf. | |
1112 | * | |
1113 | * returns 0 if everything worked, non-zero otherwise. | |
1114 | */ | |
4d775673 CM |
1115 | int btrfs_alloc_extent(struct btrfs_trans_handle *trans, |
1116 | struct btrfs_root *root, u64 owner, | |
c62a1920 | 1117 | u64 num_blocks, u64 search_start, |
be08c1b9 | 1118 | u64 search_end, struct btrfs_key *ins, int data) |
fec577fb CM |
1119 | { |
1120 | int ret; | |
1121 | int pending_ret; | |
1261ec42 CM |
1122 | u64 super_blocks_used; |
1123 | struct btrfs_fs_info *info = root->fs_info; | |
1124 | struct btrfs_root *extent_root = info->extent_root; | |
234b63a0 | 1125 | struct btrfs_extent_item extent_item; |
f2458e1d | 1126 | struct btrfs_key prealloc_key; |
037e6390 | 1127 | |
cf27e1ee | 1128 | btrfs_set_extent_refs(&extent_item, 1); |
4d775673 | 1129 | btrfs_set_extent_owner(&extent_item, owner); |
fec577fb | 1130 | |
037e6390 | 1131 | if (root == extent_root) { |
f2458e1d CM |
1132 | int nr; |
1133 | BUG_ON(info->extent_tree_prealloc_nr == 0); | |
037e6390 | 1134 | BUG_ON(num_blocks != 1); |
037e6390 | 1135 | ins->offset = 1; |
f2458e1d CM |
1136 | info->extent_tree_prealloc_nr--; |
1137 | nr = info->extent_tree_prealloc_nr; | |
1138 | ins->objectid = info->extent_tree_prealloc[nr]; | |
1139 | info->extent_tree_insert[info->extent_tree_insert_nr++] = | |
1140 | ins->objectid; | |
9078a3e1 | 1141 | ret = update_block_group(trans, root, |
e37c9e69 | 1142 | ins->objectid, ins->offset, 1, 0); |
9078a3e1 | 1143 | BUG_ON(ret); |
fec577fb CM |
1144 | return 0; |
1145 | } | |
e37c9e69 CM |
1146 | |
1147 | /* | |
1148 | * if we're doing a data allocation, preallocate room in the | |
1149 | * extent tree first. This way the extent tree blocks end up | |
1150 | * in the correct block group. | |
1151 | */ | |
1152 | if (data) { | |
de428b63 | 1153 | ret = find_free_extent(trans, root, 0, 0, |
e37c9e69 CM |
1154 | search_end, &prealloc_key, 0); |
1155 | if (ret) { | |
1156 | return ret; | |
1157 | } | |
1158 | if (prealloc_key.objectid + prealloc_key.offset >= search_end) { | |
1159 | int nr = info->extent_tree_prealloc_nr; | |
1160 | search_end = info->extent_tree_prealloc[nr - 1] - 1; | |
1161 | } else { | |
1162 | search_start = info->extent_tree_prealloc[0] + 1; | |
1163 | } | |
1164 | } | |
f2458e1d | 1165 | /* do the real allocation */ |
e089f05c | 1166 | ret = find_free_extent(trans, root, num_blocks, search_start, |
be08c1b9 | 1167 | search_end, ins, data); |
e37c9e69 | 1168 | if (ret) { |
037e6390 | 1169 | return ret; |
e37c9e69 | 1170 | } |
fec577fb | 1171 | |
e37c9e69 CM |
1172 | /* |
1173 | * if we're doing a metadata allocation, preallocate space in the | |
1174 | * extent tree second. This way, we don't create a tiny hole | |
1175 | * in the allocation map between any unused preallocation blocks | |
1176 | * and the metadata block we're actually allocating. On disk, | |
1177 | * it'll go: | |
1178 | * [block we've allocated], [used prealloc 1], [ unused prealloc ] | |
1179 | * The unused prealloc will get reused the next time around. | |
1180 | */ | |
1181 | if (!data) { | |
1182 | if (ins->objectid + ins->offset >= search_end) | |
1183 | search_end = ins->objectid - 1; | |
1184 | else | |
1185 | search_start = ins->objectid + ins->offset; | |
3e1ad54f | 1186 | |
e37c9e69 CM |
1187 | ret = find_free_extent(trans, root, 0, search_start, |
1188 | search_end, &prealloc_key, 0); | |
1189 | if (ret) { | |
1190 | return ret; | |
1191 | } | |
1192 | } | |
f2458e1d | 1193 | |
1261ec42 CM |
1194 | super_blocks_used = btrfs_super_blocks_used(info->disk_super); |
1195 | btrfs_set_super_blocks_used(info->disk_super, super_blocks_used + | |
1196 | num_blocks); | |
e089f05c CM |
1197 | ret = btrfs_insert_item(trans, extent_root, ins, &extent_item, |
1198 | sizeof(extent_item)); | |
037e6390 | 1199 | |
e089f05c | 1200 | finish_current_insert(trans, extent_root); |
e20d96d6 | 1201 | pending_ret = del_pending_extents(trans, extent_root); |
e37c9e69 | 1202 | if (ret) { |
037e6390 | 1203 | return ret; |
e37c9e69 CM |
1204 | } |
1205 | if (pending_ret) { | |
037e6390 | 1206 | return pending_ret; |
e37c9e69 CM |
1207 | } |
1208 | ret = update_block_group(trans, root, ins->objectid, ins->offset, 1, 0); | |
037e6390 | 1209 | return 0; |
fec577fb CM |
1210 | } |
1211 | ||
1212 | /* | |
1213 | * helper function to allocate a block for a given tree | |
1214 | * returns the tree buffer or NULL. | |
1215 | */ | |
e20d96d6 | 1216 | struct buffer_head *btrfs_alloc_free_block(struct btrfs_trans_handle *trans, |
31f3c99b | 1217 | struct btrfs_root *root, u64 hint) |
fec577fb | 1218 | { |
e2fa7227 | 1219 | struct btrfs_key ins; |
fec577fb | 1220 | int ret; |
e20d96d6 | 1221 | struct buffer_head *buf; |
fec577fb | 1222 | |
4d775673 | 1223 | ret = btrfs_alloc_extent(trans, root, root->root_key.objectid, |
de428b63 | 1224 | 1, hint, (unsigned long)-1, &ins, 0); |
fec577fb CM |
1225 | if (ret) { |
1226 | BUG(); | |
1227 | return NULL; | |
1228 | } | |
9078a3e1 | 1229 | BUG_ON(ret); |
d98237b3 | 1230 | buf = btrfs_find_create_tree_block(root, ins.objectid); |
df2ce34c | 1231 | set_buffer_uptodate(buf); |
090d1875 | 1232 | set_buffer_checked(buf); |
7c4452b9 | 1233 | set_radix_bit(&trans->transaction->dirty_pages, buf->b_page->index); |
fec577fb CM |
1234 | return buf; |
1235 | } | |
a28ec197 | 1236 | |
6407bf6d CM |
1237 | static int drop_leaf_ref(struct btrfs_trans_handle *trans, |
1238 | struct btrfs_root *root, struct buffer_head *cur) | |
1239 | { | |
1240 | struct btrfs_disk_key *key; | |
1241 | struct btrfs_leaf *leaf; | |
1242 | struct btrfs_file_extent_item *fi; | |
1243 | int i; | |
1244 | int nritems; | |
1245 | int ret; | |
1246 | ||
1247 | BUG_ON(!btrfs_is_leaf(btrfs_buffer_node(cur))); | |
1248 | leaf = btrfs_buffer_leaf(cur); | |
1249 | nritems = btrfs_header_nritems(&leaf->header); | |
1250 | for (i = 0; i < nritems; i++) { | |
1251 | key = &leaf->items[i].key; | |
1252 | if (btrfs_disk_key_type(key) != BTRFS_EXTENT_DATA_KEY) | |
1253 | continue; | |
1254 | fi = btrfs_item_ptr(leaf, i, struct btrfs_file_extent_item); | |
236454df CM |
1255 | if (btrfs_file_extent_type(fi) == BTRFS_FILE_EXTENT_INLINE) |
1256 | continue; | |
6407bf6d CM |
1257 | /* |
1258 | * FIXME make sure to insert a trans record that | |
1259 | * repeats the snapshot del on crash | |
1260 | */ | |
1261 | ret = btrfs_free_extent(trans, root, | |
1262 | btrfs_file_extent_disk_blocknr(fi), | |
1263 | btrfs_file_extent_disk_num_blocks(fi), | |
1264 | 0); | |
1265 | BUG_ON(ret); | |
1266 | } | |
1267 | return 0; | |
1268 | } | |
1269 | ||
9aca1d51 CM |
1270 | /* |
1271 | * helper function for drop_snapshot, this walks down the tree dropping ref | |
1272 | * counts as it goes. | |
1273 | */ | |
e089f05c CM |
1274 | static int walk_down_tree(struct btrfs_trans_handle *trans, struct btrfs_root |
1275 | *root, struct btrfs_path *path, int *level) | |
20524f02 | 1276 | { |
e20d96d6 CM |
1277 | struct buffer_head *next; |
1278 | struct buffer_head *cur; | |
20524f02 CM |
1279 | u64 blocknr; |
1280 | int ret; | |
1281 | u32 refs; | |
1282 | ||
5caf2a00 CM |
1283 | WARN_ON(*level < 0); |
1284 | WARN_ON(*level >= BTRFS_MAX_LEVEL); | |
b18c6685 | 1285 | ret = lookup_extent_ref(trans, root, bh_blocknr(path->nodes[*level]), |
6407bf6d | 1286 | 1, &refs); |
20524f02 CM |
1287 | BUG_ON(ret); |
1288 | if (refs > 1) | |
1289 | goto out; | |
9aca1d51 CM |
1290 | /* |
1291 | * walk down to the last node level and free all the leaves | |
1292 | */ | |
6407bf6d | 1293 | while(*level >= 0) { |
5caf2a00 CM |
1294 | WARN_ON(*level < 0); |
1295 | WARN_ON(*level >= BTRFS_MAX_LEVEL); | |
20524f02 | 1296 | cur = path->nodes[*level]; |
2c90e5d6 CM |
1297 | if (btrfs_header_level(btrfs_buffer_header(cur)) != *level) |
1298 | WARN_ON(1); | |
7518a238 | 1299 | if (path->slots[*level] >= |
e20d96d6 | 1300 | btrfs_header_nritems(btrfs_buffer_header(cur))) |
20524f02 | 1301 | break; |
6407bf6d CM |
1302 | if (*level == 0) { |
1303 | ret = drop_leaf_ref(trans, root, cur); | |
1304 | BUG_ON(ret); | |
1305 | break; | |
1306 | } | |
e20d96d6 CM |
1307 | blocknr = btrfs_node_blockptr(btrfs_buffer_node(cur), |
1308 | path->slots[*level]); | |
b18c6685 | 1309 | ret = lookup_extent_ref(trans, root, blocknr, 1, &refs); |
6407bf6d CM |
1310 | BUG_ON(ret); |
1311 | if (refs != 1) { | |
20524f02 | 1312 | path->slots[*level]++; |
e089f05c | 1313 | ret = btrfs_free_extent(trans, root, blocknr, 1, 1); |
20524f02 CM |
1314 | BUG_ON(ret); |
1315 | continue; | |
1316 | } | |
20524f02 | 1317 | next = read_tree_block(root, blocknr); |
5caf2a00 | 1318 | WARN_ON(*level <= 0); |
83e15a28 | 1319 | if (path->nodes[*level-1]) |
234b63a0 | 1320 | btrfs_block_release(root, path->nodes[*level-1]); |
20524f02 | 1321 | path->nodes[*level-1] = next; |
e20d96d6 | 1322 | *level = btrfs_header_level(btrfs_buffer_header(next)); |
20524f02 CM |
1323 | path->slots[*level] = 0; |
1324 | } | |
1325 | out: | |
5caf2a00 CM |
1326 | WARN_ON(*level < 0); |
1327 | WARN_ON(*level >= BTRFS_MAX_LEVEL); | |
6407bf6d | 1328 | ret = btrfs_free_extent(trans, root, |
7eccb903 | 1329 | bh_blocknr(path->nodes[*level]), 1, 1); |
234b63a0 | 1330 | btrfs_block_release(root, path->nodes[*level]); |
20524f02 CM |
1331 | path->nodes[*level] = NULL; |
1332 | *level += 1; | |
1333 | BUG_ON(ret); | |
1334 | return 0; | |
1335 | } | |
1336 | ||
9aca1d51 CM |
1337 | /* |
1338 | * helper for dropping snapshots. This walks back up the tree in the path | |
1339 | * to find the first node higher up where we haven't yet gone through | |
1340 | * all the slots | |
1341 | */ | |
e089f05c CM |
1342 | static int walk_up_tree(struct btrfs_trans_handle *trans, struct btrfs_root |
1343 | *root, struct btrfs_path *path, int *level) | |
20524f02 CM |
1344 | { |
1345 | int i; | |
1346 | int slot; | |
1347 | int ret; | |
234b63a0 | 1348 | for(i = *level; i < BTRFS_MAX_LEVEL - 1 && path->nodes[i]; i++) { |
20524f02 | 1349 | slot = path->slots[i]; |
e20d96d6 CM |
1350 | if (slot < btrfs_header_nritems( |
1351 | btrfs_buffer_header(path->nodes[i])) - 1) { | |
20524f02 CM |
1352 | path->slots[i]++; |
1353 | *level = i; | |
1354 | return 0; | |
1355 | } else { | |
e089f05c | 1356 | ret = btrfs_free_extent(trans, root, |
7eccb903 | 1357 | bh_blocknr(path->nodes[*level]), |
e089f05c | 1358 | 1, 1); |
6407bf6d | 1359 | BUG_ON(ret); |
234b63a0 | 1360 | btrfs_block_release(root, path->nodes[*level]); |
83e15a28 | 1361 | path->nodes[*level] = NULL; |
20524f02 | 1362 | *level = i + 1; |
20524f02 CM |
1363 | } |
1364 | } | |
1365 | return 1; | |
1366 | } | |
1367 | ||
9aca1d51 CM |
1368 | /* |
1369 | * drop the reference count on the tree rooted at 'snap'. This traverses | |
1370 | * the tree freeing any blocks that have a ref count of zero after being | |
1371 | * decremented. | |
1372 | */ | |
e089f05c | 1373 | int btrfs_drop_snapshot(struct btrfs_trans_handle *trans, struct btrfs_root |
e20d96d6 | 1374 | *root, struct buffer_head *snap) |
20524f02 | 1375 | { |
3768f368 | 1376 | int ret = 0; |
9aca1d51 | 1377 | int wret; |
20524f02 | 1378 | int level; |
5caf2a00 | 1379 | struct btrfs_path *path; |
20524f02 CM |
1380 | int i; |
1381 | int orig_level; | |
1382 | ||
5caf2a00 CM |
1383 | path = btrfs_alloc_path(); |
1384 | BUG_ON(!path); | |
1385 | btrfs_init_path(path); | |
20524f02 | 1386 | |
e20d96d6 | 1387 | level = btrfs_header_level(btrfs_buffer_header(snap)); |
20524f02 | 1388 | orig_level = level; |
5caf2a00 CM |
1389 | path->nodes[level] = snap; |
1390 | path->slots[level] = 0; | |
20524f02 | 1391 | while(1) { |
5caf2a00 | 1392 | wret = walk_down_tree(trans, root, path, &level); |
9aca1d51 | 1393 | if (wret > 0) |
20524f02 | 1394 | break; |
9aca1d51 CM |
1395 | if (wret < 0) |
1396 | ret = wret; | |
1397 | ||
5caf2a00 | 1398 | wret = walk_up_tree(trans, root, path, &level); |
9aca1d51 | 1399 | if (wret > 0) |
20524f02 | 1400 | break; |
9aca1d51 CM |
1401 | if (wret < 0) |
1402 | ret = wret; | |
35b7e476 | 1403 | btrfs_btree_balance_dirty(root); |
20524f02 | 1404 | } |
83e15a28 | 1405 | for (i = 0; i <= orig_level; i++) { |
5caf2a00 CM |
1406 | if (path->nodes[i]) { |
1407 | btrfs_block_release(root, path->nodes[i]); | |
83e15a28 | 1408 | } |
20524f02 | 1409 | } |
5caf2a00 | 1410 | btrfs_free_path(path); |
9aca1d51 | 1411 | return ret; |
20524f02 | 1412 | } |
9078a3e1 | 1413 | |
be744175 | 1414 | static int free_block_group_radix(struct radix_tree_root *radix) |
9078a3e1 CM |
1415 | { |
1416 | int ret; | |
1417 | struct btrfs_block_group_cache *cache[8]; | |
1418 | int i; | |
1419 | ||
1420 | while(1) { | |
be744175 | 1421 | ret = radix_tree_gang_lookup(radix, (void **)cache, 0, |
9078a3e1 CM |
1422 | ARRAY_SIZE(cache)); |
1423 | if (!ret) | |
1424 | break; | |
1425 | for (i = 0; i < ret; i++) { | |
be744175 | 1426 | radix_tree_delete(radix, cache[i]->key.objectid + |
9078a3e1 CM |
1427 | cache[i]->key.offset - 1); |
1428 | kfree(cache[i]); | |
1429 | } | |
1430 | } | |
1431 | return 0; | |
1432 | } | |
1433 | ||
be744175 CM |
1434 | int btrfs_free_block_groups(struct btrfs_fs_info *info) |
1435 | { | |
1436 | int ret; | |
1437 | int ret2; | |
e37c9e69 CM |
1438 | unsigned long gang[16]; |
1439 | int i; | |
be744175 CM |
1440 | |
1441 | ret = free_block_group_radix(&info->block_group_radix); | |
1442 | ret2 = free_block_group_radix(&info->block_group_data_radix); | |
1443 | if (ret) | |
1444 | return ret; | |
1445 | if (ret2) | |
1446 | return ret2; | |
e37c9e69 CM |
1447 | |
1448 | while(1) { | |
1449 | ret = find_first_radix_bit(&info->extent_map_radix, | |
1450 | gang, 0, ARRAY_SIZE(gang)); | |
1451 | if (!ret) | |
1452 | break; | |
1453 | for (i = 0; i < ret; i++) { | |
1454 | clear_radix_bit(&info->extent_map_radix, gang[i]); | |
1455 | } | |
1456 | } | |
be744175 CM |
1457 | return 0; |
1458 | } | |
1459 | ||
9078a3e1 CM |
1460 | int btrfs_read_block_groups(struct btrfs_root *root) |
1461 | { | |
1462 | struct btrfs_path *path; | |
1463 | int ret; | |
1464 | int err = 0; | |
1465 | struct btrfs_block_group_item *bi; | |
1466 | struct btrfs_block_group_cache *cache; | |
be744175 CM |
1467 | struct btrfs_fs_info *info = root->fs_info; |
1468 | struct radix_tree_root *radix; | |
9078a3e1 CM |
1469 | struct btrfs_key key; |
1470 | struct btrfs_key found_key; | |
1471 | struct btrfs_leaf *leaf; | |
1472 | u64 group_size_blocks = BTRFS_BLOCK_GROUP_SIZE / root->blocksize; | |
31f3c99b | 1473 | u64 used; |
be744175 | 1474 | u64 nr = 0; |
9078a3e1 | 1475 | |
be744175 | 1476 | root = info->extent_root; |
9078a3e1 CM |
1477 | key.objectid = 0; |
1478 | key.offset = group_size_blocks; | |
1479 | key.flags = 0; | |
1480 | btrfs_set_key_type(&key, BTRFS_BLOCK_GROUP_ITEM_KEY); | |
1481 | ||
1482 | path = btrfs_alloc_path(); | |
1483 | if (!path) | |
1484 | return -ENOMEM; | |
1485 | ||
1486 | while(1) { | |
be744175 | 1487 | ret = btrfs_search_slot(NULL, info->extent_root, |
9078a3e1 CM |
1488 | &key, path, 0, 0); |
1489 | if (ret != 0) { | |
1490 | err = ret; | |
1491 | break; | |
1492 | } | |
1493 | leaf = btrfs_buffer_leaf(path->nodes[0]); | |
1494 | btrfs_disk_key_to_cpu(&found_key, | |
1495 | &leaf->items[path->slots[0]].key); | |
1496 | cache = kmalloc(sizeof(*cache), GFP_NOFS); | |
1497 | if (!cache) { | |
1498 | err = -1; | |
1499 | break; | |
1500 | } | |
3e1ad54f | 1501 | |
e37c9e69 | 1502 | if (nr % 3) |
3e1ad54f CM |
1503 | radix = &info->block_group_data_radix; |
1504 | else | |
1505 | radix = &info->block_group_radix; | |
1506 | ||
9078a3e1 CM |
1507 | bi = btrfs_item_ptr(leaf, path->slots[0], |
1508 | struct btrfs_block_group_item); | |
1509 | memcpy(&cache->item, bi, sizeof(*bi)); | |
1510 | memcpy(&cache->key, &found_key, sizeof(found_key)); | |
31f3c99b CM |
1511 | cache->last_alloc = cache->key.objectid; |
1512 | cache->first_free = cache->key.objectid; | |
e37c9e69 | 1513 | cache->last_prealloc = cache->key.objectid; |
be744175 | 1514 | cache->pinned = 0; |
e37c9e69 CM |
1515 | cache->cached = 0; |
1516 | ||
1517 | if (nr % 3) | |
1518 | cache->data = 1; | |
1519 | else | |
1520 | cache->data = 0; | |
3e1ad54f CM |
1521 | cache->radix = radix; |
1522 | ||
9078a3e1 CM |
1523 | key.objectid = found_key.objectid + found_key.offset; |
1524 | btrfs_release_path(root, path); | |
be744175 | 1525 | ret = radix_tree_insert(radix, found_key.objectid + |
9078a3e1 CM |
1526 | found_key.offset - 1, |
1527 | (void *)cache); | |
1528 | BUG_ON(ret); | |
31f3c99b | 1529 | used = btrfs_block_group_used(bi); |
be744175 CM |
1530 | if (used < (key.offset * 8) / 10) { |
1531 | radix_tree_tag_set(radix, found_key.objectid + | |
31f3c99b CM |
1532 | found_key.offset - 1, |
1533 | BTRFS_BLOCK_GROUP_AVAIL); | |
1534 | } | |
9078a3e1 | 1535 | if (key.objectid >= |
be744175 | 1536 | btrfs_super_total_blocks(info->disk_super)) |
9078a3e1 | 1537 | break; |
be744175 | 1538 | nr++; |
9078a3e1 CM |
1539 | } |
1540 | ||
1541 | btrfs_free_path(path); | |
1542 | return 0; | |
1543 | } |