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bed92eae AJ |
1 | /* |
2 | * Copyright (C) 2011 STRATO. 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 | ||
19 | #include <linux/sched.h> | |
20 | #include <linux/pagemap.h> | |
21 | #include <linux/writeback.h> | |
22 | #include <linux/blkdev.h> | |
23 | #include <linux/rbtree.h> | |
24 | #include <linux/slab.h> | |
25 | #include <linux/workqueue.h> | |
55e301fd | 26 | #include <linux/btrfs.h> |
bed92eae AJ |
27 | |
28 | #include "ctree.h" | |
29 | #include "transaction.h" | |
30 | #include "disk-io.h" | |
31 | #include "locking.h" | |
32 | #include "ulist.h" | |
bed92eae | 33 | #include "backref.h" |
2f232036 | 34 | #include "extent_io.h" |
fcebe456 | 35 | #include "qgroup.h" |
bed92eae AJ |
36 | |
37 | /* TODO XXX FIXME | |
38 | * - subvol delete -> delete when ref goes to 0? delete limits also? | |
39 | * - reorganize keys | |
40 | * - compressed | |
41 | * - sync | |
bed92eae AJ |
42 | * - copy also limits on subvol creation |
43 | * - limit | |
44 | * - caches fuer ulists | |
45 | * - performance benchmarks | |
46 | * - check all ioctl parameters | |
47 | */ | |
48 | ||
49 | /* | |
50 | * one struct for each qgroup, organized in fs_info->qgroup_tree. | |
51 | */ | |
52 | struct btrfs_qgroup { | |
53 | u64 qgroupid; | |
54 | ||
55 | /* | |
56 | * state | |
57 | */ | |
58 | u64 rfer; /* referenced */ | |
59 | u64 rfer_cmpr; /* referenced compressed */ | |
60 | u64 excl; /* exclusive */ | |
61 | u64 excl_cmpr; /* exclusive compressed */ | |
62 | ||
63 | /* | |
64 | * limits | |
65 | */ | |
66 | u64 lim_flags; /* which limits are set */ | |
67 | u64 max_rfer; | |
68 | u64 max_excl; | |
69 | u64 rsv_rfer; | |
70 | u64 rsv_excl; | |
71 | ||
72 | /* | |
73 | * reservation tracking | |
74 | */ | |
75 | u64 reserved; | |
76 | ||
77 | /* | |
78 | * lists | |
79 | */ | |
80 | struct list_head groups; /* groups this group is member of */ | |
81 | struct list_head members; /* groups that are members of this group */ | |
82 | struct list_head dirty; /* dirty groups */ | |
83 | struct rb_node node; /* tree of qgroups */ | |
84 | ||
85 | /* | |
86 | * temp variables for accounting operations | |
87 | */ | |
fcebe456 JB |
88 | u64 old_refcnt; |
89 | u64 new_refcnt; | |
bed92eae AJ |
90 | }; |
91 | ||
92 | /* | |
93 | * glue structure to represent the relations between qgroups. | |
94 | */ | |
95 | struct btrfs_qgroup_list { | |
96 | struct list_head next_group; | |
97 | struct list_head next_member; | |
98 | struct btrfs_qgroup *group; | |
99 | struct btrfs_qgroup *member; | |
100 | }; | |
101 | ||
fcebe456 JB |
102 | #define ptr_to_u64(x) ((u64)(uintptr_t)x) |
103 | #define u64_to_ptr(x) ((struct btrfs_qgroup *)(uintptr_t)x) | |
104 | ||
b382a324 JS |
105 | static int |
106 | qgroup_rescan_init(struct btrfs_fs_info *fs_info, u64 progress_objectid, | |
107 | int init_flags); | |
108 | static void qgroup_rescan_zero_tracking(struct btrfs_fs_info *fs_info); | |
2f232036 | 109 | |
58400fce | 110 | /* must be called with qgroup_ioctl_lock held */ |
bed92eae AJ |
111 | static struct btrfs_qgroup *find_qgroup_rb(struct btrfs_fs_info *fs_info, |
112 | u64 qgroupid) | |
113 | { | |
114 | struct rb_node *n = fs_info->qgroup_tree.rb_node; | |
115 | struct btrfs_qgroup *qgroup; | |
116 | ||
117 | while (n) { | |
118 | qgroup = rb_entry(n, struct btrfs_qgroup, node); | |
119 | if (qgroup->qgroupid < qgroupid) | |
120 | n = n->rb_left; | |
121 | else if (qgroup->qgroupid > qgroupid) | |
122 | n = n->rb_right; | |
123 | else | |
124 | return qgroup; | |
125 | } | |
126 | return NULL; | |
127 | } | |
128 | ||
129 | /* must be called with qgroup_lock held */ | |
130 | static struct btrfs_qgroup *add_qgroup_rb(struct btrfs_fs_info *fs_info, | |
131 | u64 qgroupid) | |
132 | { | |
133 | struct rb_node **p = &fs_info->qgroup_tree.rb_node; | |
134 | struct rb_node *parent = NULL; | |
135 | struct btrfs_qgroup *qgroup; | |
136 | ||
137 | while (*p) { | |
138 | parent = *p; | |
139 | qgroup = rb_entry(parent, struct btrfs_qgroup, node); | |
140 | ||
141 | if (qgroup->qgroupid < qgroupid) | |
142 | p = &(*p)->rb_left; | |
143 | else if (qgroup->qgroupid > qgroupid) | |
144 | p = &(*p)->rb_right; | |
145 | else | |
146 | return qgroup; | |
147 | } | |
148 | ||
149 | qgroup = kzalloc(sizeof(*qgroup), GFP_ATOMIC); | |
150 | if (!qgroup) | |
151 | return ERR_PTR(-ENOMEM); | |
152 | ||
153 | qgroup->qgroupid = qgroupid; | |
154 | INIT_LIST_HEAD(&qgroup->groups); | |
155 | INIT_LIST_HEAD(&qgroup->members); | |
156 | INIT_LIST_HEAD(&qgroup->dirty); | |
157 | ||
158 | rb_link_node(&qgroup->node, parent, p); | |
159 | rb_insert_color(&qgroup->node, &fs_info->qgroup_tree); | |
160 | ||
161 | return qgroup; | |
162 | } | |
163 | ||
4082bd3d | 164 | static void __del_qgroup_rb(struct btrfs_qgroup *qgroup) |
bed92eae | 165 | { |
bed92eae AJ |
166 | struct btrfs_qgroup_list *list; |
167 | ||
bed92eae | 168 | list_del(&qgroup->dirty); |
bed92eae AJ |
169 | while (!list_empty(&qgroup->groups)) { |
170 | list = list_first_entry(&qgroup->groups, | |
171 | struct btrfs_qgroup_list, next_group); | |
172 | list_del(&list->next_group); | |
173 | list_del(&list->next_member); | |
174 | kfree(list); | |
175 | } | |
176 | ||
177 | while (!list_empty(&qgroup->members)) { | |
178 | list = list_first_entry(&qgroup->members, | |
179 | struct btrfs_qgroup_list, next_member); | |
180 | list_del(&list->next_group); | |
181 | list_del(&list->next_member); | |
182 | kfree(list); | |
183 | } | |
184 | kfree(qgroup); | |
4082bd3d | 185 | } |
bed92eae | 186 | |
4082bd3d WS |
187 | /* must be called with qgroup_lock held */ |
188 | static int del_qgroup_rb(struct btrfs_fs_info *fs_info, u64 qgroupid) | |
189 | { | |
190 | struct btrfs_qgroup *qgroup = find_qgroup_rb(fs_info, qgroupid); | |
191 | ||
192 | if (!qgroup) | |
193 | return -ENOENT; | |
194 | ||
195 | rb_erase(&qgroup->node, &fs_info->qgroup_tree); | |
196 | __del_qgroup_rb(qgroup); | |
bed92eae AJ |
197 | return 0; |
198 | } | |
199 | ||
200 | /* must be called with qgroup_lock held */ | |
201 | static int add_relation_rb(struct btrfs_fs_info *fs_info, | |
202 | u64 memberid, u64 parentid) | |
203 | { | |
204 | struct btrfs_qgroup *member; | |
205 | struct btrfs_qgroup *parent; | |
206 | struct btrfs_qgroup_list *list; | |
207 | ||
208 | member = find_qgroup_rb(fs_info, memberid); | |
209 | parent = find_qgroup_rb(fs_info, parentid); | |
210 | if (!member || !parent) | |
211 | return -ENOENT; | |
212 | ||
213 | list = kzalloc(sizeof(*list), GFP_ATOMIC); | |
214 | if (!list) | |
215 | return -ENOMEM; | |
216 | ||
217 | list->group = parent; | |
218 | list->member = member; | |
219 | list_add_tail(&list->next_group, &member->groups); | |
220 | list_add_tail(&list->next_member, &parent->members); | |
221 | ||
222 | return 0; | |
223 | } | |
224 | ||
225 | /* must be called with qgroup_lock held */ | |
226 | static int del_relation_rb(struct btrfs_fs_info *fs_info, | |
227 | u64 memberid, u64 parentid) | |
228 | { | |
229 | struct btrfs_qgroup *member; | |
230 | struct btrfs_qgroup *parent; | |
231 | struct btrfs_qgroup_list *list; | |
232 | ||
233 | member = find_qgroup_rb(fs_info, memberid); | |
234 | parent = find_qgroup_rb(fs_info, parentid); | |
235 | if (!member || !parent) | |
236 | return -ENOENT; | |
237 | ||
238 | list_for_each_entry(list, &member->groups, next_group) { | |
239 | if (list->group == parent) { | |
240 | list_del(&list->next_group); | |
241 | list_del(&list->next_member); | |
242 | kfree(list); | |
243 | return 0; | |
244 | } | |
245 | } | |
246 | return -ENOENT; | |
247 | } | |
248 | ||
faa2dbf0 JB |
249 | #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS |
250 | int btrfs_verify_qgroup_counts(struct btrfs_fs_info *fs_info, u64 qgroupid, | |
251 | u64 rfer, u64 excl) | |
252 | { | |
253 | struct btrfs_qgroup *qgroup; | |
254 | ||
255 | qgroup = find_qgroup_rb(fs_info, qgroupid); | |
256 | if (!qgroup) | |
257 | return -EINVAL; | |
258 | if (qgroup->rfer != rfer || qgroup->excl != excl) | |
259 | return -EINVAL; | |
260 | return 0; | |
261 | } | |
262 | #endif | |
263 | ||
bed92eae AJ |
264 | /* |
265 | * The full config is read in one go, only called from open_ctree() | |
266 | * It doesn't use any locking, as at this point we're still single-threaded | |
267 | */ | |
268 | int btrfs_read_qgroup_config(struct btrfs_fs_info *fs_info) | |
269 | { | |
270 | struct btrfs_key key; | |
271 | struct btrfs_key found_key; | |
272 | struct btrfs_root *quota_root = fs_info->quota_root; | |
273 | struct btrfs_path *path = NULL; | |
274 | struct extent_buffer *l; | |
275 | int slot; | |
276 | int ret = 0; | |
277 | u64 flags = 0; | |
b382a324 | 278 | u64 rescan_progress = 0; |
bed92eae AJ |
279 | |
280 | if (!fs_info->quota_enabled) | |
281 | return 0; | |
282 | ||
1e8f9158 WS |
283 | fs_info->qgroup_ulist = ulist_alloc(GFP_NOFS); |
284 | if (!fs_info->qgroup_ulist) { | |
285 | ret = -ENOMEM; | |
286 | goto out; | |
287 | } | |
288 | ||
bed92eae AJ |
289 | path = btrfs_alloc_path(); |
290 | if (!path) { | |
291 | ret = -ENOMEM; | |
292 | goto out; | |
293 | } | |
294 | ||
295 | /* default this to quota off, in case no status key is found */ | |
296 | fs_info->qgroup_flags = 0; | |
297 | ||
298 | /* | |
299 | * pass 1: read status, all qgroup infos and limits | |
300 | */ | |
301 | key.objectid = 0; | |
302 | key.type = 0; | |
303 | key.offset = 0; | |
304 | ret = btrfs_search_slot_for_read(quota_root, &key, path, 1, 1); | |
305 | if (ret) | |
306 | goto out; | |
307 | ||
308 | while (1) { | |
309 | struct btrfs_qgroup *qgroup; | |
310 | ||
311 | slot = path->slots[0]; | |
312 | l = path->nodes[0]; | |
313 | btrfs_item_key_to_cpu(l, &found_key, slot); | |
314 | ||
315 | if (found_key.type == BTRFS_QGROUP_STATUS_KEY) { | |
316 | struct btrfs_qgroup_status_item *ptr; | |
317 | ||
318 | ptr = btrfs_item_ptr(l, slot, | |
319 | struct btrfs_qgroup_status_item); | |
320 | ||
321 | if (btrfs_qgroup_status_version(l, ptr) != | |
322 | BTRFS_QGROUP_STATUS_VERSION) { | |
efe120a0 FH |
323 | btrfs_err(fs_info, |
324 | "old qgroup version, quota disabled"); | |
bed92eae AJ |
325 | goto out; |
326 | } | |
327 | if (btrfs_qgroup_status_generation(l, ptr) != | |
328 | fs_info->generation) { | |
329 | flags |= BTRFS_QGROUP_STATUS_FLAG_INCONSISTENT; | |
efe120a0 FH |
330 | btrfs_err(fs_info, |
331 | "qgroup generation mismatch, " | |
332 | "marked as inconsistent"); | |
bed92eae AJ |
333 | } |
334 | fs_info->qgroup_flags = btrfs_qgroup_status_flags(l, | |
335 | ptr); | |
b382a324 | 336 | rescan_progress = btrfs_qgroup_status_rescan(l, ptr); |
bed92eae AJ |
337 | goto next1; |
338 | } | |
339 | ||
340 | if (found_key.type != BTRFS_QGROUP_INFO_KEY && | |
341 | found_key.type != BTRFS_QGROUP_LIMIT_KEY) | |
342 | goto next1; | |
343 | ||
344 | qgroup = find_qgroup_rb(fs_info, found_key.offset); | |
345 | if ((qgroup && found_key.type == BTRFS_QGROUP_INFO_KEY) || | |
346 | (!qgroup && found_key.type == BTRFS_QGROUP_LIMIT_KEY)) { | |
efe120a0 | 347 | btrfs_err(fs_info, "inconsitent qgroup config"); |
bed92eae AJ |
348 | flags |= BTRFS_QGROUP_STATUS_FLAG_INCONSISTENT; |
349 | } | |
350 | if (!qgroup) { | |
351 | qgroup = add_qgroup_rb(fs_info, found_key.offset); | |
352 | if (IS_ERR(qgroup)) { | |
353 | ret = PTR_ERR(qgroup); | |
354 | goto out; | |
355 | } | |
356 | } | |
357 | switch (found_key.type) { | |
358 | case BTRFS_QGROUP_INFO_KEY: { | |
359 | struct btrfs_qgroup_info_item *ptr; | |
360 | ||
361 | ptr = btrfs_item_ptr(l, slot, | |
362 | struct btrfs_qgroup_info_item); | |
363 | qgroup->rfer = btrfs_qgroup_info_rfer(l, ptr); | |
364 | qgroup->rfer_cmpr = btrfs_qgroup_info_rfer_cmpr(l, ptr); | |
365 | qgroup->excl = btrfs_qgroup_info_excl(l, ptr); | |
366 | qgroup->excl_cmpr = btrfs_qgroup_info_excl_cmpr(l, ptr); | |
367 | /* generation currently unused */ | |
368 | break; | |
369 | } | |
370 | case BTRFS_QGROUP_LIMIT_KEY: { | |
371 | struct btrfs_qgroup_limit_item *ptr; | |
372 | ||
373 | ptr = btrfs_item_ptr(l, slot, | |
374 | struct btrfs_qgroup_limit_item); | |
375 | qgroup->lim_flags = btrfs_qgroup_limit_flags(l, ptr); | |
376 | qgroup->max_rfer = btrfs_qgroup_limit_max_rfer(l, ptr); | |
377 | qgroup->max_excl = btrfs_qgroup_limit_max_excl(l, ptr); | |
378 | qgroup->rsv_rfer = btrfs_qgroup_limit_rsv_rfer(l, ptr); | |
379 | qgroup->rsv_excl = btrfs_qgroup_limit_rsv_excl(l, ptr); | |
380 | break; | |
381 | } | |
382 | } | |
383 | next1: | |
384 | ret = btrfs_next_item(quota_root, path); | |
385 | if (ret < 0) | |
386 | goto out; | |
387 | if (ret) | |
388 | break; | |
389 | } | |
390 | btrfs_release_path(path); | |
391 | ||
392 | /* | |
393 | * pass 2: read all qgroup relations | |
394 | */ | |
395 | key.objectid = 0; | |
396 | key.type = BTRFS_QGROUP_RELATION_KEY; | |
397 | key.offset = 0; | |
398 | ret = btrfs_search_slot_for_read(quota_root, &key, path, 1, 0); | |
399 | if (ret) | |
400 | goto out; | |
401 | while (1) { | |
402 | slot = path->slots[0]; | |
403 | l = path->nodes[0]; | |
404 | btrfs_item_key_to_cpu(l, &found_key, slot); | |
405 | ||
406 | if (found_key.type != BTRFS_QGROUP_RELATION_KEY) | |
407 | goto next2; | |
408 | ||
409 | if (found_key.objectid > found_key.offset) { | |
410 | /* parent <- member, not needed to build config */ | |
411 | /* FIXME should we omit the key completely? */ | |
412 | goto next2; | |
413 | } | |
414 | ||
415 | ret = add_relation_rb(fs_info, found_key.objectid, | |
416 | found_key.offset); | |
ff24858c | 417 | if (ret == -ENOENT) { |
efe120a0 FH |
418 | btrfs_warn(fs_info, |
419 | "orphan qgroup relation 0x%llx->0x%llx", | |
c1c9ff7c | 420 | found_key.objectid, found_key.offset); |
ff24858c AJ |
421 | ret = 0; /* ignore the error */ |
422 | } | |
bed92eae AJ |
423 | if (ret) |
424 | goto out; | |
425 | next2: | |
426 | ret = btrfs_next_item(quota_root, path); | |
427 | if (ret < 0) | |
428 | goto out; | |
429 | if (ret) | |
430 | break; | |
431 | } | |
432 | out: | |
433 | fs_info->qgroup_flags |= flags; | |
434 | if (!(fs_info->qgroup_flags & BTRFS_QGROUP_STATUS_FLAG_ON)) { | |
435 | fs_info->quota_enabled = 0; | |
436 | fs_info->pending_quota_state = 0; | |
b382a324 JS |
437 | } else if (fs_info->qgroup_flags & BTRFS_QGROUP_STATUS_FLAG_RESCAN && |
438 | ret >= 0) { | |
439 | ret = qgroup_rescan_init(fs_info, rescan_progress, 0); | |
bed92eae AJ |
440 | } |
441 | btrfs_free_path(path); | |
442 | ||
eb1716af | 443 | if (ret < 0) { |
1e8f9158 | 444 | ulist_free(fs_info->qgroup_ulist); |
eb1716af | 445 | fs_info->qgroup_ulist = NULL; |
b382a324 | 446 | fs_info->qgroup_flags &= ~BTRFS_QGROUP_STATUS_FLAG_RESCAN; |
eb1716af | 447 | } |
1e8f9158 | 448 | |
bed92eae AJ |
449 | return ret < 0 ? ret : 0; |
450 | } | |
451 | ||
452 | /* | |
e685da14 WS |
453 | * This is called from close_ctree() or open_ctree() or btrfs_quota_disable(), |
454 | * first two are in single-threaded paths.And for the third one, we have set | |
455 | * quota_root to be null with qgroup_lock held before, so it is safe to clean | |
456 | * up the in-memory structures without qgroup_lock held. | |
bed92eae AJ |
457 | */ |
458 | void btrfs_free_qgroup_config(struct btrfs_fs_info *fs_info) | |
459 | { | |
460 | struct rb_node *n; | |
461 | struct btrfs_qgroup *qgroup; | |
bed92eae AJ |
462 | |
463 | while ((n = rb_first(&fs_info->qgroup_tree))) { | |
464 | qgroup = rb_entry(n, struct btrfs_qgroup, node); | |
465 | rb_erase(n, &fs_info->qgroup_tree); | |
4082bd3d | 466 | __del_qgroup_rb(qgroup); |
bed92eae | 467 | } |
1e7bac1e WS |
468 | /* |
469 | * we call btrfs_free_qgroup_config() when umounting | |
470 | * filesystem and disabling quota, so we set qgroup_ulit | |
471 | * to be null here to avoid double free. | |
472 | */ | |
1e8f9158 | 473 | ulist_free(fs_info->qgroup_ulist); |
1e7bac1e | 474 | fs_info->qgroup_ulist = NULL; |
bed92eae AJ |
475 | } |
476 | ||
477 | static int add_qgroup_relation_item(struct btrfs_trans_handle *trans, | |
478 | struct btrfs_root *quota_root, | |
479 | u64 src, u64 dst) | |
480 | { | |
481 | int ret; | |
482 | struct btrfs_path *path; | |
483 | struct btrfs_key key; | |
484 | ||
485 | path = btrfs_alloc_path(); | |
486 | if (!path) | |
487 | return -ENOMEM; | |
488 | ||
489 | key.objectid = src; | |
490 | key.type = BTRFS_QGROUP_RELATION_KEY; | |
491 | key.offset = dst; | |
492 | ||
493 | ret = btrfs_insert_empty_item(trans, quota_root, path, &key, 0); | |
494 | ||
495 | btrfs_mark_buffer_dirty(path->nodes[0]); | |
496 | ||
497 | btrfs_free_path(path); | |
498 | return ret; | |
499 | } | |
500 | ||
501 | static int del_qgroup_relation_item(struct btrfs_trans_handle *trans, | |
502 | struct btrfs_root *quota_root, | |
503 | u64 src, u64 dst) | |
504 | { | |
505 | int ret; | |
506 | struct btrfs_path *path; | |
507 | struct btrfs_key key; | |
508 | ||
509 | path = btrfs_alloc_path(); | |
510 | if (!path) | |
511 | return -ENOMEM; | |
512 | ||
513 | key.objectid = src; | |
514 | key.type = BTRFS_QGROUP_RELATION_KEY; | |
515 | key.offset = dst; | |
516 | ||
517 | ret = btrfs_search_slot(trans, quota_root, &key, path, -1, 1); | |
518 | if (ret < 0) | |
519 | goto out; | |
520 | ||
521 | if (ret > 0) { | |
522 | ret = -ENOENT; | |
523 | goto out; | |
524 | } | |
525 | ||
526 | ret = btrfs_del_item(trans, quota_root, path); | |
527 | out: | |
528 | btrfs_free_path(path); | |
529 | return ret; | |
530 | } | |
531 | ||
532 | static int add_qgroup_item(struct btrfs_trans_handle *trans, | |
533 | struct btrfs_root *quota_root, u64 qgroupid) | |
534 | { | |
535 | int ret; | |
536 | struct btrfs_path *path; | |
537 | struct btrfs_qgroup_info_item *qgroup_info; | |
538 | struct btrfs_qgroup_limit_item *qgroup_limit; | |
539 | struct extent_buffer *leaf; | |
540 | struct btrfs_key key; | |
541 | ||
fccb84c9 | 542 | if (btrfs_test_is_dummy_root(quota_root)) |
faa2dbf0 | 543 | return 0; |
fccb84c9 | 544 | |
bed92eae AJ |
545 | path = btrfs_alloc_path(); |
546 | if (!path) | |
547 | return -ENOMEM; | |
548 | ||
549 | key.objectid = 0; | |
550 | key.type = BTRFS_QGROUP_INFO_KEY; | |
551 | key.offset = qgroupid; | |
552 | ||
0b4699dc MF |
553 | /* |
554 | * Avoid a transaction abort by catching -EEXIST here. In that | |
555 | * case, we proceed by re-initializing the existing structure | |
556 | * on disk. | |
557 | */ | |
558 | ||
bed92eae AJ |
559 | ret = btrfs_insert_empty_item(trans, quota_root, path, &key, |
560 | sizeof(*qgroup_info)); | |
0b4699dc | 561 | if (ret && ret != -EEXIST) |
bed92eae AJ |
562 | goto out; |
563 | ||
564 | leaf = path->nodes[0]; | |
565 | qgroup_info = btrfs_item_ptr(leaf, path->slots[0], | |
566 | struct btrfs_qgroup_info_item); | |
567 | btrfs_set_qgroup_info_generation(leaf, qgroup_info, trans->transid); | |
568 | btrfs_set_qgroup_info_rfer(leaf, qgroup_info, 0); | |
569 | btrfs_set_qgroup_info_rfer_cmpr(leaf, qgroup_info, 0); | |
570 | btrfs_set_qgroup_info_excl(leaf, qgroup_info, 0); | |
571 | btrfs_set_qgroup_info_excl_cmpr(leaf, qgroup_info, 0); | |
572 | ||
573 | btrfs_mark_buffer_dirty(leaf); | |
574 | ||
575 | btrfs_release_path(path); | |
576 | ||
577 | key.type = BTRFS_QGROUP_LIMIT_KEY; | |
578 | ret = btrfs_insert_empty_item(trans, quota_root, path, &key, | |
579 | sizeof(*qgroup_limit)); | |
0b4699dc | 580 | if (ret && ret != -EEXIST) |
bed92eae AJ |
581 | goto out; |
582 | ||
583 | leaf = path->nodes[0]; | |
584 | qgroup_limit = btrfs_item_ptr(leaf, path->slots[0], | |
585 | struct btrfs_qgroup_limit_item); | |
586 | btrfs_set_qgroup_limit_flags(leaf, qgroup_limit, 0); | |
587 | btrfs_set_qgroup_limit_max_rfer(leaf, qgroup_limit, 0); | |
588 | btrfs_set_qgroup_limit_max_excl(leaf, qgroup_limit, 0); | |
589 | btrfs_set_qgroup_limit_rsv_rfer(leaf, qgroup_limit, 0); | |
590 | btrfs_set_qgroup_limit_rsv_excl(leaf, qgroup_limit, 0); | |
591 | ||
592 | btrfs_mark_buffer_dirty(leaf); | |
593 | ||
594 | ret = 0; | |
595 | out: | |
596 | btrfs_free_path(path); | |
597 | return ret; | |
598 | } | |
599 | ||
600 | static int del_qgroup_item(struct btrfs_trans_handle *trans, | |
601 | struct btrfs_root *quota_root, u64 qgroupid) | |
602 | { | |
603 | int ret; | |
604 | struct btrfs_path *path; | |
605 | struct btrfs_key key; | |
606 | ||
607 | path = btrfs_alloc_path(); | |
608 | if (!path) | |
609 | return -ENOMEM; | |
610 | ||
611 | key.objectid = 0; | |
612 | key.type = BTRFS_QGROUP_INFO_KEY; | |
613 | key.offset = qgroupid; | |
614 | ret = btrfs_search_slot(trans, quota_root, &key, path, -1, 1); | |
615 | if (ret < 0) | |
616 | goto out; | |
617 | ||
618 | if (ret > 0) { | |
619 | ret = -ENOENT; | |
620 | goto out; | |
621 | } | |
622 | ||
623 | ret = btrfs_del_item(trans, quota_root, path); | |
624 | if (ret) | |
625 | goto out; | |
626 | ||
627 | btrfs_release_path(path); | |
628 | ||
629 | key.type = BTRFS_QGROUP_LIMIT_KEY; | |
630 | ret = btrfs_search_slot(trans, quota_root, &key, path, -1, 1); | |
631 | if (ret < 0) | |
632 | goto out; | |
633 | ||
634 | if (ret > 0) { | |
635 | ret = -ENOENT; | |
636 | goto out; | |
637 | } | |
638 | ||
639 | ret = btrfs_del_item(trans, quota_root, path); | |
640 | ||
641 | out: | |
642 | btrfs_free_path(path); | |
643 | return ret; | |
644 | } | |
645 | ||
646 | static int update_qgroup_limit_item(struct btrfs_trans_handle *trans, | |
1510e71c DY |
647 | struct btrfs_root *root, |
648 | struct btrfs_qgroup *qgroup) | |
bed92eae AJ |
649 | { |
650 | struct btrfs_path *path; | |
651 | struct btrfs_key key; | |
652 | struct extent_buffer *l; | |
653 | struct btrfs_qgroup_limit_item *qgroup_limit; | |
654 | int ret; | |
655 | int slot; | |
656 | ||
657 | key.objectid = 0; | |
658 | key.type = BTRFS_QGROUP_LIMIT_KEY; | |
1510e71c | 659 | key.offset = qgroup->qgroupid; |
bed92eae AJ |
660 | |
661 | path = btrfs_alloc_path(); | |
84cbe2f7 WS |
662 | if (!path) |
663 | return -ENOMEM; | |
664 | ||
bed92eae AJ |
665 | ret = btrfs_search_slot(trans, root, &key, path, 0, 1); |
666 | if (ret > 0) | |
667 | ret = -ENOENT; | |
668 | ||
669 | if (ret) | |
670 | goto out; | |
671 | ||
672 | l = path->nodes[0]; | |
673 | slot = path->slots[0]; | |
a3df41ee | 674 | qgroup_limit = btrfs_item_ptr(l, slot, struct btrfs_qgroup_limit_item); |
1510e71c DY |
675 | btrfs_set_qgroup_limit_flags(l, qgroup_limit, qgroup->lim_flags); |
676 | btrfs_set_qgroup_limit_max_rfer(l, qgroup_limit, qgroup->max_rfer); | |
677 | btrfs_set_qgroup_limit_max_excl(l, qgroup_limit, qgroup->max_excl); | |
678 | btrfs_set_qgroup_limit_rsv_rfer(l, qgroup_limit, qgroup->rsv_rfer); | |
679 | btrfs_set_qgroup_limit_rsv_excl(l, qgroup_limit, qgroup->rsv_excl); | |
bed92eae AJ |
680 | |
681 | btrfs_mark_buffer_dirty(l); | |
682 | ||
683 | out: | |
684 | btrfs_free_path(path); | |
685 | return ret; | |
686 | } | |
687 | ||
688 | static int update_qgroup_info_item(struct btrfs_trans_handle *trans, | |
689 | struct btrfs_root *root, | |
690 | struct btrfs_qgroup *qgroup) | |
691 | { | |
692 | struct btrfs_path *path; | |
693 | struct btrfs_key key; | |
694 | struct extent_buffer *l; | |
695 | struct btrfs_qgroup_info_item *qgroup_info; | |
696 | int ret; | |
697 | int slot; | |
698 | ||
fccb84c9 | 699 | if (btrfs_test_is_dummy_root(root)) |
faa2dbf0 | 700 | return 0; |
fccb84c9 | 701 | |
bed92eae AJ |
702 | key.objectid = 0; |
703 | key.type = BTRFS_QGROUP_INFO_KEY; | |
704 | key.offset = qgroup->qgroupid; | |
705 | ||
706 | path = btrfs_alloc_path(); | |
84cbe2f7 WS |
707 | if (!path) |
708 | return -ENOMEM; | |
709 | ||
bed92eae AJ |
710 | ret = btrfs_search_slot(trans, root, &key, path, 0, 1); |
711 | if (ret > 0) | |
712 | ret = -ENOENT; | |
713 | ||
714 | if (ret) | |
715 | goto out; | |
716 | ||
717 | l = path->nodes[0]; | |
718 | slot = path->slots[0]; | |
a3df41ee | 719 | qgroup_info = btrfs_item_ptr(l, slot, struct btrfs_qgroup_info_item); |
bed92eae AJ |
720 | btrfs_set_qgroup_info_generation(l, qgroup_info, trans->transid); |
721 | btrfs_set_qgroup_info_rfer(l, qgroup_info, qgroup->rfer); | |
722 | btrfs_set_qgroup_info_rfer_cmpr(l, qgroup_info, qgroup->rfer_cmpr); | |
723 | btrfs_set_qgroup_info_excl(l, qgroup_info, qgroup->excl); | |
724 | btrfs_set_qgroup_info_excl_cmpr(l, qgroup_info, qgroup->excl_cmpr); | |
725 | ||
726 | btrfs_mark_buffer_dirty(l); | |
727 | ||
728 | out: | |
729 | btrfs_free_path(path); | |
730 | return ret; | |
731 | } | |
732 | ||
733 | static int update_qgroup_status_item(struct btrfs_trans_handle *trans, | |
734 | struct btrfs_fs_info *fs_info, | |
735 | struct btrfs_root *root) | |
736 | { | |
737 | struct btrfs_path *path; | |
738 | struct btrfs_key key; | |
739 | struct extent_buffer *l; | |
740 | struct btrfs_qgroup_status_item *ptr; | |
741 | int ret; | |
742 | int slot; | |
743 | ||
744 | key.objectid = 0; | |
745 | key.type = BTRFS_QGROUP_STATUS_KEY; | |
746 | key.offset = 0; | |
747 | ||
748 | path = btrfs_alloc_path(); | |
84cbe2f7 WS |
749 | if (!path) |
750 | return -ENOMEM; | |
751 | ||
bed92eae AJ |
752 | ret = btrfs_search_slot(trans, root, &key, path, 0, 1); |
753 | if (ret > 0) | |
754 | ret = -ENOENT; | |
755 | ||
756 | if (ret) | |
757 | goto out; | |
758 | ||
759 | l = path->nodes[0]; | |
760 | slot = path->slots[0]; | |
761 | ptr = btrfs_item_ptr(l, slot, struct btrfs_qgroup_status_item); | |
762 | btrfs_set_qgroup_status_flags(l, ptr, fs_info->qgroup_flags); | |
763 | btrfs_set_qgroup_status_generation(l, ptr, trans->transid); | |
2f232036 JS |
764 | btrfs_set_qgroup_status_rescan(l, ptr, |
765 | fs_info->qgroup_rescan_progress.objectid); | |
bed92eae AJ |
766 | |
767 | btrfs_mark_buffer_dirty(l); | |
768 | ||
769 | out: | |
770 | btrfs_free_path(path); | |
771 | return ret; | |
772 | } | |
773 | ||
774 | /* | |
775 | * called with qgroup_lock held | |
776 | */ | |
777 | static int btrfs_clean_quota_tree(struct btrfs_trans_handle *trans, | |
778 | struct btrfs_root *root) | |
779 | { | |
780 | struct btrfs_path *path; | |
781 | struct btrfs_key key; | |
06b3a860 | 782 | struct extent_buffer *leaf = NULL; |
bed92eae | 783 | int ret; |
06b3a860 | 784 | int nr = 0; |
bed92eae | 785 | |
bed92eae AJ |
786 | path = btrfs_alloc_path(); |
787 | if (!path) | |
788 | return -ENOMEM; | |
789 | ||
06b3a860 WS |
790 | path->leave_spinning = 1; |
791 | ||
792 | key.objectid = 0; | |
793 | key.offset = 0; | |
794 | key.type = 0; | |
bed92eae | 795 | |
06b3a860 | 796 | while (1) { |
bed92eae | 797 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); |
06b3a860 WS |
798 | if (ret < 0) |
799 | goto out; | |
800 | leaf = path->nodes[0]; | |
801 | nr = btrfs_header_nritems(leaf); | |
802 | if (!nr) | |
bed92eae | 803 | break; |
06b3a860 WS |
804 | /* |
805 | * delete the leaf one by one | |
806 | * since the whole tree is going | |
807 | * to be deleted. | |
808 | */ | |
809 | path->slots[0] = 0; | |
810 | ret = btrfs_del_items(trans, root, path, 0, nr); | |
bed92eae AJ |
811 | if (ret) |
812 | goto out; | |
06b3a860 | 813 | |
bed92eae AJ |
814 | btrfs_release_path(path); |
815 | } | |
816 | ret = 0; | |
817 | out: | |
818 | root->fs_info->pending_quota_state = 0; | |
819 | btrfs_free_path(path); | |
820 | return ret; | |
821 | } | |
822 | ||
823 | int btrfs_quota_enable(struct btrfs_trans_handle *trans, | |
824 | struct btrfs_fs_info *fs_info) | |
825 | { | |
826 | struct btrfs_root *quota_root; | |
7708f029 | 827 | struct btrfs_root *tree_root = fs_info->tree_root; |
bed92eae AJ |
828 | struct btrfs_path *path = NULL; |
829 | struct btrfs_qgroup_status_item *ptr; | |
830 | struct extent_buffer *leaf; | |
831 | struct btrfs_key key; | |
7708f029 WS |
832 | struct btrfs_key found_key; |
833 | struct btrfs_qgroup *qgroup = NULL; | |
bed92eae | 834 | int ret = 0; |
7708f029 | 835 | int slot; |
bed92eae | 836 | |
f2f6ed3d | 837 | mutex_lock(&fs_info->qgroup_ioctl_lock); |
bed92eae AJ |
838 | if (fs_info->quota_root) { |
839 | fs_info->pending_quota_state = 1; | |
bed92eae AJ |
840 | goto out; |
841 | } | |
bed92eae | 842 | |
1e8f9158 WS |
843 | fs_info->qgroup_ulist = ulist_alloc(GFP_NOFS); |
844 | if (!fs_info->qgroup_ulist) { | |
845 | ret = -ENOMEM; | |
846 | goto out; | |
847 | } | |
848 | ||
bed92eae AJ |
849 | /* |
850 | * initially create the quota tree | |
851 | */ | |
852 | quota_root = btrfs_create_tree(trans, fs_info, | |
853 | BTRFS_QUOTA_TREE_OBJECTID); | |
854 | if (IS_ERR(quota_root)) { | |
855 | ret = PTR_ERR(quota_root); | |
856 | goto out; | |
857 | } | |
858 | ||
859 | path = btrfs_alloc_path(); | |
5b7ff5b3 TI |
860 | if (!path) { |
861 | ret = -ENOMEM; | |
862 | goto out_free_root; | |
863 | } | |
bed92eae AJ |
864 | |
865 | key.objectid = 0; | |
866 | key.type = BTRFS_QGROUP_STATUS_KEY; | |
867 | key.offset = 0; | |
868 | ||
869 | ret = btrfs_insert_empty_item(trans, quota_root, path, &key, | |
870 | sizeof(*ptr)); | |
871 | if (ret) | |
5b7ff5b3 | 872 | goto out_free_path; |
bed92eae AJ |
873 | |
874 | leaf = path->nodes[0]; | |
875 | ptr = btrfs_item_ptr(leaf, path->slots[0], | |
876 | struct btrfs_qgroup_status_item); | |
877 | btrfs_set_qgroup_status_generation(leaf, ptr, trans->transid); | |
878 | btrfs_set_qgroup_status_version(leaf, ptr, BTRFS_QGROUP_STATUS_VERSION); | |
879 | fs_info->qgroup_flags = BTRFS_QGROUP_STATUS_FLAG_ON | | |
880 | BTRFS_QGROUP_STATUS_FLAG_INCONSISTENT; | |
881 | btrfs_set_qgroup_status_flags(leaf, ptr, fs_info->qgroup_flags); | |
2f232036 | 882 | btrfs_set_qgroup_status_rescan(leaf, ptr, 0); |
bed92eae AJ |
883 | |
884 | btrfs_mark_buffer_dirty(leaf); | |
885 | ||
7708f029 WS |
886 | key.objectid = 0; |
887 | key.type = BTRFS_ROOT_REF_KEY; | |
888 | key.offset = 0; | |
889 | ||
890 | btrfs_release_path(path); | |
891 | ret = btrfs_search_slot_for_read(tree_root, &key, path, 1, 0); | |
892 | if (ret > 0) | |
893 | goto out_add_root; | |
894 | if (ret < 0) | |
895 | goto out_free_path; | |
896 | ||
897 | ||
898 | while (1) { | |
899 | slot = path->slots[0]; | |
900 | leaf = path->nodes[0]; | |
901 | btrfs_item_key_to_cpu(leaf, &found_key, slot); | |
902 | ||
903 | if (found_key.type == BTRFS_ROOT_REF_KEY) { | |
904 | ret = add_qgroup_item(trans, quota_root, | |
905 | found_key.offset); | |
906 | if (ret) | |
907 | goto out_free_path; | |
908 | ||
7708f029 WS |
909 | qgroup = add_qgroup_rb(fs_info, found_key.offset); |
910 | if (IS_ERR(qgroup)) { | |
7708f029 WS |
911 | ret = PTR_ERR(qgroup); |
912 | goto out_free_path; | |
913 | } | |
7708f029 WS |
914 | } |
915 | ret = btrfs_next_item(tree_root, path); | |
916 | if (ret < 0) | |
917 | goto out_free_path; | |
918 | if (ret) | |
919 | break; | |
920 | } | |
921 | ||
922 | out_add_root: | |
923 | btrfs_release_path(path); | |
924 | ret = add_qgroup_item(trans, quota_root, BTRFS_FS_TREE_OBJECTID); | |
925 | if (ret) | |
926 | goto out_free_path; | |
927 | ||
7708f029 WS |
928 | qgroup = add_qgroup_rb(fs_info, BTRFS_FS_TREE_OBJECTID); |
929 | if (IS_ERR(qgroup)) { | |
7708f029 WS |
930 | ret = PTR_ERR(qgroup); |
931 | goto out_free_path; | |
932 | } | |
58400fce | 933 | spin_lock(&fs_info->qgroup_lock); |
bed92eae AJ |
934 | fs_info->quota_root = quota_root; |
935 | fs_info->pending_quota_state = 1; | |
936 | spin_unlock(&fs_info->qgroup_lock); | |
5b7ff5b3 | 937 | out_free_path: |
bed92eae | 938 | btrfs_free_path(path); |
5b7ff5b3 TI |
939 | out_free_root: |
940 | if (ret) { | |
941 | free_extent_buffer(quota_root->node); | |
942 | free_extent_buffer(quota_root->commit_root); | |
943 | kfree(quota_root); | |
944 | } | |
945 | out: | |
eb1716af | 946 | if (ret) { |
1e8f9158 | 947 | ulist_free(fs_info->qgroup_ulist); |
eb1716af JS |
948 | fs_info->qgroup_ulist = NULL; |
949 | } | |
f2f6ed3d | 950 | mutex_unlock(&fs_info->qgroup_ioctl_lock); |
bed92eae AJ |
951 | return ret; |
952 | } | |
953 | ||
954 | int btrfs_quota_disable(struct btrfs_trans_handle *trans, | |
955 | struct btrfs_fs_info *fs_info) | |
956 | { | |
957 | struct btrfs_root *tree_root = fs_info->tree_root; | |
958 | struct btrfs_root *quota_root; | |
959 | int ret = 0; | |
960 | ||
f2f6ed3d | 961 | mutex_lock(&fs_info->qgroup_ioctl_lock); |
58400fce | 962 | if (!fs_info->quota_root) |
f2f6ed3d | 963 | goto out; |
58400fce | 964 | spin_lock(&fs_info->qgroup_lock); |
bed92eae AJ |
965 | fs_info->quota_enabled = 0; |
966 | fs_info->pending_quota_state = 0; | |
967 | quota_root = fs_info->quota_root; | |
968 | fs_info->quota_root = NULL; | |
bed92eae AJ |
969 | spin_unlock(&fs_info->qgroup_lock); |
970 | ||
e685da14 WS |
971 | btrfs_free_qgroup_config(fs_info); |
972 | ||
bed92eae AJ |
973 | ret = btrfs_clean_quota_tree(trans, quota_root); |
974 | if (ret) | |
975 | goto out; | |
976 | ||
977 | ret = btrfs_del_root(trans, tree_root, "a_root->root_key); | |
978 | if (ret) | |
979 | goto out; | |
980 | ||
981 | list_del("a_root->dirty_list); | |
982 | ||
983 | btrfs_tree_lock(quota_root->node); | |
01d58472 | 984 | clean_tree_block(trans, tree_root->fs_info, quota_root->node); |
bed92eae AJ |
985 | btrfs_tree_unlock(quota_root->node); |
986 | btrfs_free_tree_block(trans, quota_root, quota_root->node, 0, 1); | |
987 | ||
988 | free_extent_buffer(quota_root->node); | |
989 | free_extent_buffer(quota_root->commit_root); | |
990 | kfree(quota_root); | |
991 | out: | |
f2f6ed3d | 992 | mutex_unlock(&fs_info->qgroup_ioctl_lock); |
bed92eae AJ |
993 | return ret; |
994 | } | |
995 | ||
2f232036 JS |
996 | static void qgroup_dirty(struct btrfs_fs_info *fs_info, |
997 | struct btrfs_qgroup *qgroup) | |
bed92eae | 998 | { |
2f232036 JS |
999 | if (list_empty(&qgroup->dirty)) |
1000 | list_add(&qgroup->dirty, &fs_info->dirty_qgroups); | |
bed92eae AJ |
1001 | } |
1002 | ||
1003 | int btrfs_add_qgroup_relation(struct btrfs_trans_handle *trans, | |
1004 | struct btrfs_fs_info *fs_info, u64 src, u64 dst) | |
1005 | { | |
1006 | struct btrfs_root *quota_root; | |
b7fef4f5 WS |
1007 | struct btrfs_qgroup *parent; |
1008 | struct btrfs_qgroup *member; | |
534e6623 | 1009 | struct btrfs_qgroup_list *list; |
bed92eae AJ |
1010 | int ret = 0; |
1011 | ||
f2f6ed3d | 1012 | mutex_lock(&fs_info->qgroup_ioctl_lock); |
bed92eae | 1013 | quota_root = fs_info->quota_root; |
f2f6ed3d WS |
1014 | if (!quota_root) { |
1015 | ret = -EINVAL; | |
1016 | goto out; | |
1017 | } | |
b7fef4f5 WS |
1018 | member = find_qgroup_rb(fs_info, src); |
1019 | parent = find_qgroup_rb(fs_info, dst); | |
1020 | if (!member || !parent) { | |
1021 | ret = -EINVAL; | |
1022 | goto out; | |
1023 | } | |
bed92eae | 1024 | |
534e6623 WS |
1025 | /* check if such qgroup relation exist firstly */ |
1026 | list_for_each_entry(list, &member->groups, next_group) { | |
1027 | if (list->group == parent) { | |
1028 | ret = -EEXIST; | |
1029 | goto out; | |
1030 | } | |
1031 | } | |
1032 | ||
bed92eae AJ |
1033 | ret = add_qgroup_relation_item(trans, quota_root, src, dst); |
1034 | if (ret) | |
f2f6ed3d | 1035 | goto out; |
bed92eae AJ |
1036 | |
1037 | ret = add_qgroup_relation_item(trans, quota_root, dst, src); | |
1038 | if (ret) { | |
1039 | del_qgroup_relation_item(trans, quota_root, src, dst); | |
f2f6ed3d | 1040 | goto out; |
bed92eae AJ |
1041 | } |
1042 | ||
1043 | spin_lock(&fs_info->qgroup_lock); | |
1044 | ret = add_relation_rb(quota_root->fs_info, src, dst); | |
1045 | spin_unlock(&fs_info->qgroup_lock); | |
f2f6ed3d WS |
1046 | out: |
1047 | mutex_unlock(&fs_info->qgroup_ioctl_lock); | |
bed92eae AJ |
1048 | return ret; |
1049 | } | |
1050 | ||
1051 | int btrfs_del_qgroup_relation(struct btrfs_trans_handle *trans, | |
1052 | struct btrfs_fs_info *fs_info, u64 src, u64 dst) | |
1053 | { | |
1054 | struct btrfs_root *quota_root; | |
534e6623 WS |
1055 | struct btrfs_qgroup *parent; |
1056 | struct btrfs_qgroup *member; | |
1057 | struct btrfs_qgroup_list *list; | |
bed92eae AJ |
1058 | int ret = 0; |
1059 | int err; | |
1060 | ||
f2f6ed3d | 1061 | mutex_lock(&fs_info->qgroup_ioctl_lock); |
bed92eae | 1062 | quota_root = fs_info->quota_root; |
f2f6ed3d WS |
1063 | if (!quota_root) { |
1064 | ret = -EINVAL; | |
1065 | goto out; | |
1066 | } | |
bed92eae | 1067 | |
534e6623 WS |
1068 | member = find_qgroup_rb(fs_info, src); |
1069 | parent = find_qgroup_rb(fs_info, dst); | |
1070 | if (!member || !parent) { | |
1071 | ret = -EINVAL; | |
1072 | goto out; | |
1073 | } | |
1074 | ||
1075 | /* check if such qgroup relation exist firstly */ | |
1076 | list_for_each_entry(list, &member->groups, next_group) { | |
1077 | if (list->group == parent) | |
1078 | goto exist; | |
1079 | } | |
1080 | ret = -ENOENT; | |
1081 | goto out; | |
1082 | exist: | |
bed92eae AJ |
1083 | ret = del_qgroup_relation_item(trans, quota_root, src, dst); |
1084 | err = del_qgroup_relation_item(trans, quota_root, dst, src); | |
1085 | if (err && !ret) | |
1086 | ret = err; | |
1087 | ||
1088 | spin_lock(&fs_info->qgroup_lock); | |
1089 | del_relation_rb(fs_info, src, dst); | |
bed92eae | 1090 | spin_unlock(&fs_info->qgroup_lock); |
f2f6ed3d WS |
1091 | out: |
1092 | mutex_unlock(&fs_info->qgroup_ioctl_lock); | |
bed92eae AJ |
1093 | return ret; |
1094 | } | |
1095 | ||
1096 | int btrfs_create_qgroup(struct btrfs_trans_handle *trans, | |
4087cf24 | 1097 | struct btrfs_fs_info *fs_info, u64 qgroupid) |
bed92eae AJ |
1098 | { |
1099 | struct btrfs_root *quota_root; | |
1100 | struct btrfs_qgroup *qgroup; | |
1101 | int ret = 0; | |
1102 | ||
f2f6ed3d | 1103 | mutex_lock(&fs_info->qgroup_ioctl_lock); |
bed92eae | 1104 | quota_root = fs_info->quota_root; |
f2f6ed3d WS |
1105 | if (!quota_root) { |
1106 | ret = -EINVAL; | |
1107 | goto out; | |
1108 | } | |
534e6623 WS |
1109 | qgroup = find_qgroup_rb(fs_info, qgroupid); |
1110 | if (qgroup) { | |
1111 | ret = -EEXIST; | |
1112 | goto out; | |
1113 | } | |
bed92eae AJ |
1114 | |
1115 | ret = add_qgroup_item(trans, quota_root, qgroupid); | |
534e6623 WS |
1116 | if (ret) |
1117 | goto out; | |
bed92eae AJ |
1118 | |
1119 | spin_lock(&fs_info->qgroup_lock); | |
1120 | qgroup = add_qgroup_rb(fs_info, qgroupid); | |
1121 | spin_unlock(&fs_info->qgroup_lock); | |
1122 | ||
1123 | if (IS_ERR(qgroup)) | |
1124 | ret = PTR_ERR(qgroup); | |
f2f6ed3d WS |
1125 | out: |
1126 | mutex_unlock(&fs_info->qgroup_ioctl_lock); | |
bed92eae AJ |
1127 | return ret; |
1128 | } | |
1129 | ||
1130 | int btrfs_remove_qgroup(struct btrfs_trans_handle *trans, | |
1131 | struct btrfs_fs_info *fs_info, u64 qgroupid) | |
1132 | { | |
1133 | struct btrfs_root *quota_root; | |
2cf68703 | 1134 | struct btrfs_qgroup *qgroup; |
bed92eae AJ |
1135 | int ret = 0; |
1136 | ||
f2f6ed3d | 1137 | mutex_lock(&fs_info->qgroup_ioctl_lock); |
bed92eae | 1138 | quota_root = fs_info->quota_root; |
f2f6ed3d WS |
1139 | if (!quota_root) { |
1140 | ret = -EINVAL; | |
1141 | goto out; | |
1142 | } | |
bed92eae | 1143 | |
2cf68703 | 1144 | qgroup = find_qgroup_rb(fs_info, qgroupid); |
534e6623 WS |
1145 | if (!qgroup) { |
1146 | ret = -ENOENT; | |
1147 | goto out; | |
1148 | } else { | |
1149 | /* check if there are no relations to this qgroup */ | |
1150 | if (!list_empty(&qgroup->groups) || | |
1151 | !list_empty(&qgroup->members)) { | |
f2f6ed3d WS |
1152 | ret = -EBUSY; |
1153 | goto out; | |
2cf68703 AJ |
1154 | } |
1155 | } | |
bed92eae AJ |
1156 | ret = del_qgroup_item(trans, quota_root, qgroupid); |
1157 | ||
1158 | spin_lock(&fs_info->qgroup_lock); | |
1159 | del_qgroup_rb(quota_root->fs_info, qgroupid); | |
bed92eae | 1160 | spin_unlock(&fs_info->qgroup_lock); |
f2f6ed3d WS |
1161 | out: |
1162 | mutex_unlock(&fs_info->qgroup_ioctl_lock); | |
bed92eae AJ |
1163 | return ret; |
1164 | } | |
1165 | ||
1166 | int btrfs_limit_qgroup(struct btrfs_trans_handle *trans, | |
1167 | struct btrfs_fs_info *fs_info, u64 qgroupid, | |
1168 | struct btrfs_qgroup_limit *limit) | |
1169 | { | |
f2f6ed3d | 1170 | struct btrfs_root *quota_root; |
bed92eae AJ |
1171 | struct btrfs_qgroup *qgroup; |
1172 | int ret = 0; | |
1173 | ||
f2f6ed3d WS |
1174 | mutex_lock(&fs_info->qgroup_ioctl_lock); |
1175 | quota_root = fs_info->quota_root; | |
1176 | if (!quota_root) { | |
1177 | ret = -EINVAL; | |
1178 | goto out; | |
1179 | } | |
bed92eae | 1180 | |
ddb47afa WS |
1181 | qgroup = find_qgroup_rb(fs_info, qgroupid); |
1182 | if (!qgroup) { | |
1183 | ret = -ENOENT; | |
1184 | goto out; | |
1185 | } | |
bed92eae | 1186 | |
58400fce | 1187 | spin_lock(&fs_info->qgroup_lock); |
03477d94 DY |
1188 | if (limit->flags & BTRFS_QGROUP_LIMIT_MAX_RFER) |
1189 | qgroup->max_rfer = limit->max_rfer; | |
1190 | if (limit->flags & BTRFS_QGROUP_LIMIT_MAX_EXCL) | |
1191 | qgroup->max_excl = limit->max_excl; | |
1192 | if (limit->flags & BTRFS_QGROUP_LIMIT_RSV_RFER) | |
1193 | qgroup->rsv_rfer = limit->rsv_rfer; | |
1194 | if (limit->flags & BTRFS_QGROUP_LIMIT_RSV_EXCL) | |
1195 | qgroup->rsv_excl = limit->rsv_excl; | |
1196 | qgroup->lim_flags |= limit->flags; | |
1197 | ||
bed92eae | 1198 | spin_unlock(&fs_info->qgroup_lock); |
1510e71c DY |
1199 | |
1200 | ret = update_qgroup_limit_item(trans, quota_root, qgroup); | |
1201 | if (ret) { | |
1202 | fs_info->qgroup_flags |= BTRFS_QGROUP_STATUS_FLAG_INCONSISTENT; | |
1203 | btrfs_info(fs_info, "unable to update quota limit for %llu", | |
1204 | qgroupid); | |
1205 | } | |
1206 | ||
f2f6ed3d WS |
1207 | out: |
1208 | mutex_unlock(&fs_info->qgroup_ioctl_lock); | |
bed92eae AJ |
1209 | return ret; |
1210 | } | |
1152651a MF |
1211 | |
1212 | static int comp_oper_exist(struct btrfs_qgroup_operation *oper1, | |
1213 | struct btrfs_qgroup_operation *oper2) | |
1214 | { | |
1215 | /* | |
1216 | * Ignore seq and type here, we're looking for any operation | |
1217 | * at all related to this extent on that root. | |
1218 | */ | |
1219 | if (oper1->bytenr < oper2->bytenr) | |
1220 | return -1; | |
1221 | if (oper1->bytenr > oper2->bytenr) | |
1222 | return 1; | |
1223 | if (oper1->ref_root < oper2->ref_root) | |
1224 | return -1; | |
1225 | if (oper1->ref_root > oper2->ref_root) | |
1226 | return 1; | |
1227 | return 0; | |
1228 | } | |
1229 | ||
1230 | static int qgroup_oper_exists(struct btrfs_fs_info *fs_info, | |
1231 | struct btrfs_qgroup_operation *oper) | |
1232 | { | |
1233 | struct rb_node *n; | |
1234 | struct btrfs_qgroup_operation *cur; | |
1235 | int cmp; | |
1236 | ||
1237 | spin_lock(&fs_info->qgroup_op_lock); | |
1238 | n = fs_info->qgroup_op_tree.rb_node; | |
1239 | while (n) { | |
1240 | cur = rb_entry(n, struct btrfs_qgroup_operation, n); | |
1241 | cmp = comp_oper_exist(cur, oper); | |
1242 | if (cmp < 0) { | |
1243 | n = n->rb_right; | |
1244 | } else if (cmp) { | |
1245 | n = n->rb_left; | |
1246 | } else { | |
1247 | spin_unlock(&fs_info->qgroup_op_lock); | |
1248 | return -EEXIST; | |
1249 | } | |
1250 | } | |
1251 | spin_unlock(&fs_info->qgroup_op_lock); | |
1252 | return 0; | |
1253 | } | |
1254 | ||
fcebe456 JB |
1255 | static int comp_oper(struct btrfs_qgroup_operation *oper1, |
1256 | struct btrfs_qgroup_operation *oper2) | |
1257 | { | |
1258 | if (oper1->bytenr < oper2->bytenr) | |
1259 | return -1; | |
1260 | if (oper1->bytenr > oper2->bytenr) | |
1261 | return 1; | |
fcebe456 JB |
1262 | if (oper1->ref_root < oper2->ref_root) |
1263 | return -1; | |
1264 | if (oper1->ref_root > oper2->ref_root) | |
1265 | return 1; | |
bf691960 FM |
1266 | if (oper1->seq < oper2->seq) |
1267 | return -1; | |
1268 | if (oper1->seq > oper2->seq) | |
1269 | return 1; | |
fcebe456 JB |
1270 | if (oper1->type < oper2->type) |
1271 | return -1; | |
1272 | if (oper1->type > oper2->type) | |
1273 | return 1; | |
1274 | return 0; | |
1275 | } | |
1276 | ||
1277 | static int insert_qgroup_oper(struct btrfs_fs_info *fs_info, | |
1278 | struct btrfs_qgroup_operation *oper) | |
1279 | { | |
1280 | struct rb_node **p; | |
1281 | struct rb_node *parent = NULL; | |
1282 | struct btrfs_qgroup_operation *cur; | |
1283 | int cmp; | |
1284 | ||
1285 | spin_lock(&fs_info->qgroup_op_lock); | |
1286 | p = &fs_info->qgroup_op_tree.rb_node; | |
1287 | while (*p) { | |
1288 | parent = *p; | |
1289 | cur = rb_entry(parent, struct btrfs_qgroup_operation, n); | |
1290 | cmp = comp_oper(cur, oper); | |
1291 | if (cmp < 0) { | |
1292 | p = &(*p)->rb_right; | |
1293 | } else if (cmp) { | |
1294 | p = &(*p)->rb_left; | |
1295 | } else { | |
1296 | spin_unlock(&fs_info->qgroup_op_lock); | |
1297 | return -EEXIST; | |
1298 | } | |
1299 | } | |
1300 | rb_link_node(&oper->n, parent, p); | |
1301 | rb_insert_color(&oper->n, &fs_info->qgroup_op_tree); | |
1302 | spin_unlock(&fs_info->qgroup_op_lock); | |
1303 | return 0; | |
1304 | } | |
bed92eae | 1305 | |
bed92eae | 1306 | /* |
fcebe456 JB |
1307 | * Record a quota operation for processing later on. |
1308 | * @trans: the transaction we are adding the delayed op to. | |
1309 | * @fs_info: the fs_info for this fs. | |
1310 | * @ref_root: the root of the reference we are acting on, | |
1311 | * @bytenr: the bytenr we are acting on. | |
1312 | * @num_bytes: the number of bytes in the reference. | |
1313 | * @type: the type of operation this is. | |
1314 | * @mod_seq: do we need to get a sequence number for looking up roots. | |
1315 | * | |
1316 | * We just add it to our trans qgroup_ref_list and carry on and process these | |
1317 | * operations in order at some later point. If the reference root isn't a fs | |
1318 | * root then we don't bother with doing anything. | |
1319 | * | |
1320 | * MUST BE HOLDING THE REF LOCK. | |
bed92eae AJ |
1321 | */ |
1322 | int btrfs_qgroup_record_ref(struct btrfs_trans_handle *trans, | |
fcebe456 JB |
1323 | struct btrfs_fs_info *fs_info, u64 ref_root, |
1324 | u64 bytenr, u64 num_bytes, | |
1325 | enum btrfs_qgroup_operation_type type, int mod_seq) | |
bed92eae | 1326 | { |
fcebe456 JB |
1327 | struct btrfs_qgroup_operation *oper; |
1328 | int ret; | |
bed92eae | 1329 | |
fcebe456 JB |
1330 | if (!is_fstree(ref_root) || !fs_info->quota_enabled) |
1331 | return 0; | |
1332 | ||
1333 | oper = kmalloc(sizeof(*oper), GFP_NOFS); | |
1334 | if (!oper) | |
bed92eae AJ |
1335 | return -ENOMEM; |
1336 | ||
fcebe456 JB |
1337 | oper->ref_root = ref_root; |
1338 | oper->bytenr = bytenr; | |
1339 | oper->num_bytes = num_bytes; | |
1340 | oper->type = type; | |
1341 | oper->seq = atomic_inc_return(&fs_info->qgroup_op_seq); | |
1342 | INIT_LIST_HEAD(&oper->elem.list); | |
1343 | oper->elem.seq = 0; | |
1152651a | 1344 | |
d3982100 MF |
1345 | trace_btrfs_qgroup_record_ref(oper); |
1346 | ||
1152651a MF |
1347 | if (type == BTRFS_QGROUP_OPER_SUB_SUBTREE) { |
1348 | /* | |
1349 | * If any operation for this bytenr/ref_root combo | |
1350 | * exists, then we know it's not exclusively owned and | |
1351 | * shouldn't be queued up. | |
1352 | * | |
1353 | * This also catches the case where we have a cloned | |
1354 | * extent that gets queued up multiple times during | |
1355 | * drop snapshot. | |
1356 | */ | |
1357 | if (qgroup_oper_exists(fs_info, oper)) { | |
1358 | kfree(oper); | |
1359 | return 0; | |
1360 | } | |
1361 | } | |
1362 | ||
fcebe456 JB |
1363 | ret = insert_qgroup_oper(fs_info, oper); |
1364 | if (ret) { | |
1365 | /* Shouldn't happen so have an assert for developers */ | |
1366 | ASSERT(0); | |
1367 | kfree(oper); | |
1368 | return ret; | |
1369 | } | |
1370 | list_add_tail(&oper->list, &trans->qgroup_ref_list); | |
1371 | ||
1372 | if (mod_seq) | |
1373 | btrfs_get_tree_mod_seq(fs_info, &oper->elem); | |
bed92eae AJ |
1374 | |
1375 | return 0; | |
1376 | } | |
1377 | ||
fcebe456 JB |
1378 | /* |
1379 | * The easy accounting, if we are adding/removing the only ref for an extent | |
1380 | * then this qgroup and all of the parent qgroups get their refrence and | |
1381 | * exclusive counts adjusted. | |
1382 | */ | |
1383 | static int qgroup_excl_accounting(struct btrfs_fs_info *fs_info, | |
1384 | struct btrfs_qgroup_operation *oper) | |
1385 | { | |
1386 | struct btrfs_qgroup *qgroup; | |
1387 | struct ulist *tmp; | |
1388 | struct btrfs_qgroup_list *glist; | |
1389 | struct ulist_node *unode; | |
1390 | struct ulist_iterator uiter; | |
1391 | int sign = 0; | |
1392 | int ret = 0; | |
1393 | ||
1394 | tmp = ulist_alloc(GFP_NOFS); | |
1395 | if (!tmp) | |
1396 | return -ENOMEM; | |
1397 | ||
1398 | spin_lock(&fs_info->qgroup_lock); | |
1399 | if (!fs_info->quota_root) | |
1400 | goto out; | |
1401 | qgroup = find_qgroup_rb(fs_info, oper->ref_root); | |
1402 | if (!qgroup) | |
1403 | goto out; | |
1404 | switch (oper->type) { | |
1405 | case BTRFS_QGROUP_OPER_ADD_EXCL: | |
1406 | sign = 1; | |
1407 | break; | |
1408 | case BTRFS_QGROUP_OPER_SUB_EXCL: | |
1409 | sign = -1; | |
1410 | break; | |
1411 | default: | |
1412 | ASSERT(0); | |
1413 | } | |
1414 | qgroup->rfer += sign * oper->num_bytes; | |
1415 | qgroup->rfer_cmpr += sign * oper->num_bytes; | |
1416 | ||
1417 | WARN_ON(sign < 0 && qgroup->excl < oper->num_bytes); | |
1418 | qgroup->excl += sign * oper->num_bytes; | |
1419 | qgroup->excl_cmpr += sign * oper->num_bytes; | |
1420 | ||
1421 | qgroup_dirty(fs_info, qgroup); | |
1422 | ||
1423 | /* Get all of the parent groups that contain this qgroup */ | |
1424 | list_for_each_entry(glist, &qgroup->groups, next_group) { | |
1425 | ret = ulist_add(tmp, glist->group->qgroupid, | |
1426 | ptr_to_u64(glist->group), GFP_ATOMIC); | |
1427 | if (ret < 0) | |
1428 | goto out; | |
1429 | } | |
1430 | ||
1431 | /* Iterate all of the parents and adjust their reference counts */ | |
1432 | ULIST_ITER_INIT(&uiter); | |
1433 | while ((unode = ulist_next(tmp, &uiter))) { | |
1434 | qgroup = u64_to_ptr(unode->aux); | |
1435 | qgroup->rfer += sign * oper->num_bytes; | |
1436 | qgroup->rfer_cmpr += sign * oper->num_bytes; | |
0ee13fe2 | 1437 | WARN_ON(sign < 0 && qgroup->excl < oper->num_bytes); |
fcebe456 | 1438 | qgroup->excl += sign * oper->num_bytes; |
fcebe456 JB |
1439 | qgroup->excl_cmpr += sign * oper->num_bytes; |
1440 | qgroup_dirty(fs_info, qgroup); | |
1441 | ||
1442 | /* Add any parents of the parents */ | |
1443 | list_for_each_entry(glist, &qgroup->groups, next_group) { | |
1444 | ret = ulist_add(tmp, glist->group->qgroupid, | |
1445 | ptr_to_u64(glist->group), GFP_ATOMIC); | |
1446 | if (ret < 0) | |
1447 | goto out; | |
1448 | } | |
1449 | } | |
1450 | ret = 0; | |
1451 | out: | |
1452 | spin_unlock(&fs_info->qgroup_lock); | |
1453 | ulist_free(tmp); | |
1454 | return ret; | |
1455 | } | |
1456 | ||
1457 | /* | |
1458 | * Walk all of the roots that pointed to our bytenr and adjust their refcnts as | |
1459 | * properly. | |
1460 | */ | |
1461 | static int qgroup_calc_old_refcnt(struct btrfs_fs_info *fs_info, | |
1462 | u64 root_to_skip, struct ulist *tmp, | |
1463 | struct ulist *roots, struct ulist *qgroups, | |
1464 | u64 seq, int *old_roots, int rescan) | |
46b665ce JS |
1465 | { |
1466 | struct ulist_node *unode; | |
1467 | struct ulist_iterator uiter; | |
1468 | struct ulist_node *tmp_unode; | |
1469 | struct ulist_iterator tmp_uiter; | |
1470 | struct btrfs_qgroup *qg; | |
1471 | int ret; | |
1472 | ||
1473 | ULIST_ITER_INIT(&uiter); | |
1474 | while ((unode = ulist_next(roots, &uiter))) { | |
fcebe456 JB |
1475 | /* We don't count our current root here */ |
1476 | if (unode->val == root_to_skip) | |
1477 | continue; | |
46b665ce JS |
1478 | qg = find_qgroup_rb(fs_info, unode->val); |
1479 | if (!qg) | |
1480 | continue; | |
fcebe456 JB |
1481 | /* |
1482 | * We could have a pending removal of this same ref so we may | |
1483 | * not have actually found our ref root when doing | |
1484 | * btrfs_find_all_roots, so we need to keep track of how many | |
1485 | * old roots we find in case we removed ours and added a | |
1486 | * different one at the same time. I don't think this could | |
1487 | * happen in practice but that sort of thinking leads to pain | |
1488 | * and suffering and to the dark side. | |
1489 | */ | |
1490 | (*old_roots)++; | |
46b665ce JS |
1491 | |
1492 | ulist_reinit(tmp); | |
fcebe456 JB |
1493 | ret = ulist_add(qgroups, qg->qgroupid, ptr_to_u64(qg), |
1494 | GFP_ATOMIC); | |
1495 | if (ret < 0) | |
1496 | return ret; | |
1497 | ret = ulist_add(tmp, qg->qgroupid, ptr_to_u64(qg), GFP_ATOMIC); | |
46b665ce JS |
1498 | if (ret < 0) |
1499 | return ret; | |
1500 | ULIST_ITER_INIT(&tmp_uiter); | |
1501 | while ((tmp_unode = ulist_next(tmp, &tmp_uiter))) { | |
1502 | struct btrfs_qgroup_list *glist; | |
1503 | ||
fcebe456 JB |
1504 | qg = u64_to_ptr(tmp_unode->aux); |
1505 | /* | |
1506 | * We use this sequence number to keep from having to | |
1507 | * run the whole list and 0 out the refcnt every time. | |
1508 | * We basically use sequnce as the known 0 count and | |
1509 | * then add 1 everytime we see a qgroup. This is how we | |
1510 | * get how many of the roots actually point up to the | |
1511 | * upper level qgroups in order to determine exclusive | |
1512 | * counts. | |
1513 | * | |
1514 | * For rescan we want to set old_refcnt to seq so our | |
1515 | * exclusive calculations end up correct. | |
1516 | */ | |
1517 | if (rescan) | |
1518 | qg->old_refcnt = seq; | |
1519 | else if (qg->old_refcnt < seq) | |
1520 | qg->old_refcnt = seq + 1; | |
46b665ce | 1521 | else |
fcebe456 | 1522 | qg->old_refcnt++; |
46b665ce | 1523 | |
fcebe456 JB |
1524 | if (qg->new_refcnt < seq) |
1525 | qg->new_refcnt = seq + 1; | |
1526 | else | |
1527 | qg->new_refcnt++; | |
46b665ce | 1528 | list_for_each_entry(glist, &qg->groups, next_group) { |
fcebe456 JB |
1529 | ret = ulist_add(qgroups, glist->group->qgroupid, |
1530 | ptr_to_u64(glist->group), | |
1531 | GFP_ATOMIC); | |
1532 | if (ret < 0) | |
1533 | return ret; | |
46b665ce | 1534 | ret = ulist_add(tmp, glist->group->qgroupid, |
fcebe456 | 1535 | ptr_to_u64(glist->group), |
46b665ce JS |
1536 | GFP_ATOMIC); |
1537 | if (ret < 0) | |
1538 | return ret; | |
1539 | } | |
1540 | } | |
1541 | } | |
fcebe456 JB |
1542 | return 0; |
1543 | } | |
46b665ce | 1544 | |
fcebe456 JB |
1545 | /* |
1546 | * We need to walk forward in our operation tree and account for any roots that | |
1547 | * were deleted after we made this operation. | |
1548 | */ | |
1549 | static int qgroup_account_deleted_refs(struct btrfs_fs_info *fs_info, | |
1550 | struct btrfs_qgroup_operation *oper, | |
1551 | struct ulist *tmp, | |
1552 | struct ulist *qgroups, u64 seq, | |
1553 | int *old_roots) | |
1554 | { | |
1555 | struct ulist_node *unode; | |
1556 | struct ulist_iterator uiter; | |
1557 | struct btrfs_qgroup *qg; | |
1558 | struct btrfs_qgroup_operation *tmp_oper; | |
1559 | struct rb_node *n; | |
1560 | int ret; | |
1561 | ||
1562 | ulist_reinit(tmp); | |
1563 | ||
1564 | /* | |
1565 | * We only walk forward in the tree since we're only interested in | |
1566 | * removals that happened _after_ our operation. | |
1567 | */ | |
1568 | spin_lock(&fs_info->qgroup_op_lock); | |
1569 | n = rb_next(&oper->n); | |
1570 | spin_unlock(&fs_info->qgroup_op_lock); | |
1571 | if (!n) | |
1572 | return 0; | |
1573 | tmp_oper = rb_entry(n, struct btrfs_qgroup_operation, n); | |
1574 | while (tmp_oper->bytenr == oper->bytenr) { | |
1575 | /* | |
1576 | * If it's not a removal we don't care, additions work out | |
1577 | * properly with our refcnt tracking. | |
1578 | */ | |
1579 | if (tmp_oper->type != BTRFS_QGROUP_OPER_SUB_SHARED && | |
1580 | tmp_oper->type != BTRFS_QGROUP_OPER_SUB_EXCL) | |
1581 | goto next; | |
1582 | qg = find_qgroup_rb(fs_info, tmp_oper->ref_root); | |
1583 | if (!qg) | |
1584 | goto next; | |
1585 | ret = ulist_add(qgroups, qg->qgroupid, ptr_to_u64(qg), | |
1586 | GFP_ATOMIC); | |
1587 | if (ret) { | |
1588 | if (ret < 0) | |
1589 | return ret; | |
1590 | /* | |
1591 | * We only want to increase old_roots if this qgroup is | |
1592 | * not already in the list of qgroups. If it is already | |
1593 | * there then that means it must have been re-added or | |
1594 | * the delete will be discarded because we had an | |
1595 | * existing ref that we haven't looked up yet. In this | |
1596 | * case we don't want to increase old_roots. So if ret | |
1597 | * == 1 then we know that this is the first time we've | |
1598 | * seen this qgroup and we can bump the old_roots. | |
1599 | */ | |
1600 | (*old_roots)++; | |
1601 | ret = ulist_add(tmp, qg->qgroupid, ptr_to_u64(qg), | |
1602 | GFP_ATOMIC); | |
1603 | if (ret < 0) | |
1604 | return ret; | |
1605 | } | |
1606 | next: | |
1607 | spin_lock(&fs_info->qgroup_op_lock); | |
1608 | n = rb_next(&tmp_oper->n); | |
1609 | spin_unlock(&fs_info->qgroup_op_lock); | |
1610 | if (!n) | |
1611 | break; | |
1612 | tmp_oper = rb_entry(n, struct btrfs_qgroup_operation, n); | |
1613 | } | |
1614 | ||
1615 | /* Ok now process the qgroups we found */ | |
1616 | ULIST_ITER_INIT(&uiter); | |
1617 | while ((unode = ulist_next(tmp, &uiter))) { | |
1618 | struct btrfs_qgroup_list *glist; | |
1619 | ||
1620 | qg = u64_to_ptr(unode->aux); | |
1621 | if (qg->old_refcnt < seq) | |
1622 | qg->old_refcnt = seq + 1; | |
1623 | else | |
1624 | qg->old_refcnt++; | |
1625 | if (qg->new_refcnt < seq) | |
1626 | qg->new_refcnt = seq + 1; | |
1627 | else | |
1628 | qg->new_refcnt++; | |
1629 | list_for_each_entry(glist, &qg->groups, next_group) { | |
1630 | ret = ulist_add(qgroups, glist->group->qgroupid, | |
1631 | ptr_to_u64(glist->group), GFP_ATOMIC); | |
1632 | if (ret < 0) | |
1633 | return ret; | |
1634 | ret = ulist_add(tmp, glist->group->qgroupid, | |
1635 | ptr_to_u64(glist->group), GFP_ATOMIC); | |
1636 | if (ret < 0) | |
1637 | return ret; | |
1638 | } | |
1639 | } | |
46b665ce JS |
1640 | return 0; |
1641 | } | |
1642 | ||
fcebe456 JB |
1643 | /* Add refcnt for the newly added reference. */ |
1644 | static int qgroup_calc_new_refcnt(struct btrfs_fs_info *fs_info, | |
1645 | struct btrfs_qgroup_operation *oper, | |
1646 | struct btrfs_qgroup *qgroup, | |
1647 | struct ulist *tmp, struct ulist *qgroups, | |
1648 | u64 seq) | |
46b665ce JS |
1649 | { |
1650 | struct ulist_node *unode; | |
1651 | struct ulist_iterator uiter; | |
1652 | struct btrfs_qgroup *qg; | |
46b665ce JS |
1653 | int ret; |
1654 | ||
1655 | ulist_reinit(tmp); | |
fcebe456 JB |
1656 | ret = ulist_add(qgroups, qgroup->qgroupid, ptr_to_u64(qgroup), |
1657 | GFP_ATOMIC); | |
1658 | if (ret < 0) | |
1659 | return ret; | |
1660 | ret = ulist_add(tmp, qgroup->qgroupid, ptr_to_u64(qgroup), | |
1661 | GFP_ATOMIC); | |
46b665ce JS |
1662 | if (ret < 0) |
1663 | return ret; | |
46b665ce JS |
1664 | ULIST_ITER_INIT(&uiter); |
1665 | while ((unode = ulist_next(tmp, &uiter))) { | |
fcebe456 | 1666 | struct btrfs_qgroup_list *glist; |
46b665ce | 1667 | |
fcebe456 JB |
1668 | qg = u64_to_ptr(unode->aux); |
1669 | if (oper->type == BTRFS_QGROUP_OPER_ADD_SHARED) { | |
1670 | if (qg->new_refcnt < seq) | |
1671 | qg->new_refcnt = seq + 1; | |
1672 | else | |
1673 | qg->new_refcnt++; | |
1674 | } else { | |
1675 | if (qg->old_refcnt < seq) | |
1676 | qg->old_refcnt = seq + 1; | |
1677 | else | |
1678 | qg->old_refcnt++; | |
1679 | } | |
46b665ce JS |
1680 | list_for_each_entry(glist, &qg->groups, next_group) { |
1681 | ret = ulist_add(tmp, glist->group->qgroupid, | |
fcebe456 JB |
1682 | ptr_to_u64(glist->group), GFP_ATOMIC); |
1683 | if (ret < 0) | |
1684 | return ret; | |
1685 | ret = ulist_add(qgroups, glist->group->qgroupid, | |
1686 | ptr_to_u64(glist->group), GFP_ATOMIC); | |
46b665ce JS |
1687 | if (ret < 0) |
1688 | return ret; | |
1689 | } | |
1690 | } | |
46b665ce JS |
1691 | return 0; |
1692 | } | |
1693 | ||
fcebe456 JB |
1694 | /* |
1695 | * This adjusts the counters for all referenced qgroups if need be. | |
1696 | */ | |
1697 | static int qgroup_adjust_counters(struct btrfs_fs_info *fs_info, | |
1698 | u64 root_to_skip, u64 num_bytes, | |
1699 | struct ulist *qgroups, u64 seq, | |
1700 | int old_roots, int new_roots, int rescan) | |
46b665ce JS |
1701 | { |
1702 | struct ulist_node *unode; | |
1703 | struct ulist_iterator uiter; | |
1704 | struct btrfs_qgroup *qg; | |
fcebe456 | 1705 | u64 cur_new_count, cur_old_count; |
46b665ce JS |
1706 | |
1707 | ULIST_ITER_INIT(&uiter); | |
fcebe456 JB |
1708 | while ((unode = ulist_next(qgroups, &uiter))) { |
1709 | bool dirty = false; | |
46b665ce | 1710 | |
fcebe456 JB |
1711 | qg = u64_to_ptr(unode->aux); |
1712 | /* | |
1713 | * Wasn't referenced before but is now, add to the reference | |
1714 | * counters. | |
1715 | */ | |
1716 | if (qg->old_refcnt <= seq && qg->new_refcnt > seq) { | |
1717 | qg->rfer += num_bytes; | |
1718 | qg->rfer_cmpr += num_bytes; | |
1719 | dirty = true; | |
1720 | } | |
46b665ce | 1721 | |
fcebe456 JB |
1722 | /* |
1723 | * Was referenced before but isn't now, subtract from the | |
1724 | * reference counters. | |
1725 | */ | |
1726 | if (qg->old_refcnt > seq && qg->new_refcnt <= seq) { | |
1727 | qg->rfer -= num_bytes; | |
1728 | qg->rfer_cmpr -= num_bytes; | |
1729 | dirty = true; | |
1730 | } | |
46b665ce | 1731 | |
fcebe456 JB |
1732 | if (qg->old_refcnt < seq) |
1733 | cur_old_count = 0; | |
1734 | else | |
1735 | cur_old_count = qg->old_refcnt - seq; | |
1736 | if (qg->new_refcnt < seq) | |
1737 | cur_new_count = 0; | |
1738 | else | |
1739 | cur_new_count = qg->new_refcnt - seq; | |
46b665ce | 1740 | |
fcebe456 JB |
1741 | /* |
1742 | * If our refcount was the same as the roots previously but our | |
1743 | * new count isn't the same as the number of roots now then we | |
1744 | * went from having a exclusive reference on this range to not. | |
1745 | */ | |
1746 | if (old_roots && cur_old_count == old_roots && | |
1747 | (cur_new_count != new_roots || new_roots == 0)) { | |
1748 | WARN_ON(cur_new_count != new_roots && new_roots == 0); | |
1749 | qg->excl -= num_bytes; | |
1750 | qg->excl_cmpr -= num_bytes; | |
1751 | dirty = true; | |
1752 | } | |
46b665ce | 1753 | |
fcebe456 JB |
1754 | /* |
1755 | * If we didn't reference all the roots before but now we do we | |
1756 | * have an exclusive reference to this range. | |
1757 | */ | |
1758 | if ((!old_roots || (old_roots && cur_old_count != old_roots)) | |
1759 | && cur_new_count == new_roots) { | |
1760 | qg->excl += num_bytes; | |
1761 | qg->excl_cmpr += num_bytes; | |
1762 | dirty = true; | |
46b665ce | 1763 | } |
46b665ce | 1764 | |
fcebe456 JB |
1765 | if (dirty) |
1766 | qgroup_dirty(fs_info, qg); | |
1767 | } | |
46b665ce JS |
1768 | return 0; |
1769 | } | |
1770 | ||
bed92eae | 1771 | /* |
fcebe456 JB |
1772 | * If we removed a data extent and there were other references for that bytenr |
1773 | * then we need to lookup all referenced roots to make sure we still don't | |
1774 | * reference this bytenr. If we do then we can just discard this operation. | |
bed92eae | 1775 | */ |
fcebe456 JB |
1776 | static int check_existing_refs(struct btrfs_trans_handle *trans, |
1777 | struct btrfs_fs_info *fs_info, | |
1778 | struct btrfs_qgroup_operation *oper) | |
bed92eae | 1779 | { |
bed92eae | 1780 | struct ulist *roots = NULL; |
fcebe456 JB |
1781 | struct ulist_node *unode; |
1782 | struct ulist_iterator uiter; | |
bed92eae | 1783 | int ret = 0; |
bed92eae | 1784 | |
fcebe456 JB |
1785 | ret = btrfs_find_all_roots(trans, fs_info, oper->bytenr, |
1786 | oper->elem.seq, &roots); | |
1787 | if (ret < 0) | |
1788 | return ret; | |
1789 | ret = 0; | |
bed92eae | 1790 | |
fcebe456 JB |
1791 | ULIST_ITER_INIT(&uiter); |
1792 | while ((unode = ulist_next(roots, &uiter))) { | |
1793 | if (unode->val == oper->ref_root) { | |
1794 | ret = 1; | |
1795 | break; | |
1796 | } | |
bed92eae | 1797 | } |
fcebe456 JB |
1798 | ulist_free(roots); |
1799 | btrfs_put_tree_mod_seq(fs_info, &oper->elem); | |
bed92eae | 1800 | |
fcebe456 JB |
1801 | return ret; |
1802 | } | |
bed92eae | 1803 | |
fcebe456 JB |
1804 | /* |
1805 | * If we share a reference across multiple roots then we may need to adjust | |
1806 | * various qgroups referenced and exclusive counters. The basic premise is this | |
1807 | * | |
1808 | * 1) We have seq to represent a 0 count. Instead of looping through all of the | |
1809 | * qgroups and resetting their refcount to 0 we just constantly bump this | |
1810 | * sequence number to act as the base reference count. This means that if | |
1811 | * anybody is equal to or below this sequence they were never referenced. We | |
1812 | * jack this sequence up by the number of roots we found each time in order to | |
1813 | * make sure we don't have any overlap. | |
1814 | * | |
1815 | * 2) We first search all the roots that reference the area _except_ the root | |
1816 | * we're acting on currently. This makes up the old_refcnt of all the qgroups | |
1817 | * before. | |
1818 | * | |
1819 | * 3) We walk all of the qgroups referenced by the root we are currently acting | |
1820 | * on, and will either adjust old_refcnt in the case of a removal or the | |
1821 | * new_refcnt in the case of an addition. | |
1822 | * | |
1823 | * 4) Finally we walk all the qgroups that are referenced by this range | |
1824 | * including the root we are acting on currently. We will adjust the counters | |
1825 | * based on the number of roots we had and will have after this operation. | |
1826 | * | |
1827 | * Take this example as an illustration | |
1828 | * | |
1829 | * [qgroup 1/0] | |
1830 | * / | \ | |
1831 | * [qg 0/0] [qg 0/1] [qg 0/2] | |
1832 | * \ | / | |
1833 | * [ extent ] | |
1834 | * | |
1835 | * Say we are adding a reference that is covered by qg 0/0. The first step | |
1836 | * would give a refcnt of 1 to qg 0/1 and 0/2 and a refcnt of 2 to qg 1/0 with | |
1837 | * old_roots being 2. Because it is adding new_roots will be 1. We then go | |
1838 | * through qg 0/0 which will get the new_refcnt set to 1 and add 1 to qg 1/0's | |
1839 | * new_refcnt, bringing it to 3. We then walk through all of the qgroups, we | |
1840 | * notice that the old refcnt for qg 0/0 < the new refcnt, so we added a | |
1841 | * reference and thus must add the size to the referenced bytes. Everything | |
1842 | * else is the same so nothing else changes. | |
1843 | */ | |
1844 | static int qgroup_shared_accounting(struct btrfs_trans_handle *trans, | |
1845 | struct btrfs_fs_info *fs_info, | |
1846 | struct btrfs_qgroup_operation *oper) | |
1847 | { | |
1848 | struct ulist *roots = NULL; | |
1849 | struct ulist *qgroups, *tmp; | |
1850 | struct btrfs_qgroup *qgroup; | |
3284da7b | 1851 | struct seq_list elem = SEQ_LIST_INIT(elem); |
fcebe456 JB |
1852 | u64 seq; |
1853 | int old_roots = 0; | |
1854 | int new_roots = 0; | |
1855 | int ret = 0; | |
bed92eae | 1856 | |
fcebe456 JB |
1857 | if (oper->elem.seq) { |
1858 | ret = check_existing_refs(trans, fs_info, oper); | |
1859 | if (ret < 0) | |
1860 | return ret; | |
1861 | if (ret) | |
2f232036 | 1862 | return 0; |
2f232036 | 1863 | } |
2f232036 | 1864 | |
fcebe456 JB |
1865 | qgroups = ulist_alloc(GFP_NOFS); |
1866 | if (!qgroups) | |
1867 | return -ENOMEM; | |
2f232036 | 1868 | |
fcebe456 | 1869 | tmp = ulist_alloc(GFP_NOFS); |
d7372780 ES |
1870 | if (!tmp) { |
1871 | ulist_free(qgroups); | |
fcebe456 | 1872 | return -ENOMEM; |
d7372780 | 1873 | } |
bed92eae | 1874 | |
fcebe456 JB |
1875 | btrfs_get_tree_mod_seq(fs_info, &elem); |
1876 | ret = btrfs_find_all_roots(trans, fs_info, oper->bytenr, elem.seq, | |
1877 | &roots); | |
1878 | btrfs_put_tree_mod_seq(fs_info, &elem); | |
1879 | if (ret < 0) { | |
1880 | ulist_free(qgroups); | |
1881 | ulist_free(tmp); | |
1882 | return ret; | |
1883 | } | |
1884 | spin_lock(&fs_info->qgroup_lock); | |
1885 | qgroup = find_qgroup_rb(fs_info, oper->ref_root); | |
bed92eae | 1886 | if (!qgroup) |
fcebe456 JB |
1887 | goto out; |
1888 | seq = fs_info->qgroup_seq; | |
bed92eae AJ |
1889 | |
1890 | /* | |
fcebe456 JB |
1891 | * So roots is the list of all the roots currently pointing at the |
1892 | * bytenr, including the ref we are adding if we are adding, or not if | |
1893 | * we are removing a ref. So we pass in the ref_root to skip that root | |
1894 | * in our calculations. We set old_refnct and new_refcnt cause who the | |
1895 | * hell knows what everything looked like before, and it doesn't matter | |
1896 | * except... | |
bed92eae | 1897 | */ |
fcebe456 JB |
1898 | ret = qgroup_calc_old_refcnt(fs_info, oper->ref_root, tmp, roots, qgroups, |
1899 | seq, &old_roots, 0); | |
1900 | if (ret < 0) | |
1901 | goto out; | |
bed92eae | 1902 | |
fcebe456 JB |
1903 | /* |
1904 | * Now adjust the refcounts of the qgroups that care about this | |
1905 | * reference, either the old_count in the case of removal or new_count | |
1906 | * in the case of an addition. | |
1907 | */ | |
1908 | ret = qgroup_calc_new_refcnt(fs_info, oper, qgroup, tmp, qgroups, | |
1909 | seq); | |
1910 | if (ret < 0) | |
1911 | goto out; | |
bed92eae AJ |
1912 | |
1913 | /* | |
fcebe456 JB |
1914 | * ...in the case of removals. If we had a removal before we got around |
1915 | * to processing this operation then we need to find that guy and count | |
1916 | * his references as if they really existed so we don't end up screwing | |
1917 | * up the exclusive counts. Then whenever we go to process the delete | |
1918 | * everything will be grand and we can account for whatever exclusive | |
1919 | * changes need to be made there. We also have to pass in old_roots so | |
1920 | * we have an accurate count of the roots as it pertains to this | |
1921 | * operations view of the world. | |
bed92eae | 1922 | */ |
fcebe456 JB |
1923 | ret = qgroup_account_deleted_refs(fs_info, oper, tmp, qgroups, seq, |
1924 | &old_roots); | |
1925 | if (ret < 0) | |
1926 | goto out; | |
bed92eae AJ |
1927 | |
1928 | /* | |
fcebe456 JB |
1929 | * We are adding our root, need to adjust up the number of roots, |
1930 | * otherwise old_roots is the number of roots we want. | |
bed92eae | 1931 | */ |
fcebe456 JB |
1932 | if (oper->type == BTRFS_QGROUP_OPER_ADD_SHARED) { |
1933 | new_roots = old_roots + 1; | |
1934 | } else { | |
1935 | new_roots = old_roots; | |
1936 | old_roots++; | |
1937 | } | |
1938 | fs_info->qgroup_seq += old_roots + 1; | |
bed92eae | 1939 | |
fcebe456 JB |
1940 | |
1941 | /* | |
1942 | * And now the magic happens, bless Arne for having a pretty elegant | |
1943 | * solution for this. | |
1944 | */ | |
1945 | qgroup_adjust_counters(fs_info, oper->ref_root, oper->num_bytes, | |
1946 | qgroups, seq, old_roots, new_roots, 0); | |
1947 | out: | |
bed92eae | 1948 | spin_unlock(&fs_info->qgroup_lock); |
fcebe456 | 1949 | ulist_free(qgroups); |
bed92eae | 1950 | ulist_free(roots); |
fcebe456 JB |
1951 | ulist_free(tmp); |
1952 | return ret; | |
1953 | } | |
1954 | ||
1152651a MF |
1955 | /* |
1956 | * Process a reference to a shared subtree. This type of operation is | |
1957 | * queued during snapshot removal when we encounter extents which are | |
1958 | * shared between more than one root. | |
1959 | */ | |
1960 | static int qgroup_subtree_accounting(struct btrfs_trans_handle *trans, | |
1961 | struct btrfs_fs_info *fs_info, | |
1962 | struct btrfs_qgroup_operation *oper) | |
1963 | { | |
1964 | struct ulist *roots = NULL; | |
1965 | struct ulist_node *unode; | |
1966 | struct ulist_iterator uiter; | |
1967 | struct btrfs_qgroup_list *glist; | |
1968 | struct ulist *parents; | |
1969 | int ret = 0; | |
f90e579c | 1970 | int err; |
1152651a MF |
1971 | struct btrfs_qgroup *qg; |
1972 | u64 root_obj = 0; | |
3284da7b | 1973 | struct seq_list elem = SEQ_LIST_INIT(elem); |
1152651a MF |
1974 | |
1975 | parents = ulist_alloc(GFP_NOFS); | |
1976 | if (!parents) | |
1977 | return -ENOMEM; | |
1978 | ||
1979 | btrfs_get_tree_mod_seq(fs_info, &elem); | |
1980 | ret = btrfs_find_all_roots(trans, fs_info, oper->bytenr, | |
1981 | elem.seq, &roots); | |
1982 | btrfs_put_tree_mod_seq(fs_info, &elem); | |
1983 | if (ret < 0) | |
a3c10895 | 1984 | goto out; |
1152651a MF |
1985 | |
1986 | if (roots->nnodes != 1) | |
1987 | goto out; | |
1988 | ||
1989 | ULIST_ITER_INIT(&uiter); | |
1990 | unode = ulist_next(roots, &uiter); /* Only want 1 so no need to loop */ | |
1991 | /* | |
1992 | * If we find our ref root then that means all refs | |
1993 | * this extent has to the root have not yet been | |
1994 | * deleted. In that case, we do nothing and let the | |
1995 | * last ref for this bytenr drive our update. | |
1996 | * | |
1997 | * This can happen for example if an extent is | |
1998 | * referenced multiple times in a snapshot (clone, | |
1999 | * etc). If we are in the middle of snapshot removal, | |
2000 | * queued updates for such an extent will find the | |
2001 | * root if we have not yet finished removing the | |
2002 | * snapshot. | |
2003 | */ | |
2004 | if (unode->val == oper->ref_root) | |
2005 | goto out; | |
2006 | ||
2007 | root_obj = unode->val; | |
2008 | BUG_ON(!root_obj); | |
2009 | ||
2010 | spin_lock(&fs_info->qgroup_lock); | |
2011 | qg = find_qgroup_rb(fs_info, root_obj); | |
2012 | if (!qg) | |
2013 | goto out_unlock; | |
2014 | ||
2015 | qg->excl += oper->num_bytes; | |
2016 | qg->excl_cmpr += oper->num_bytes; | |
2017 | qgroup_dirty(fs_info, qg); | |
2018 | ||
2019 | /* | |
2020 | * Adjust counts for parent groups. First we find all | |
2021 | * parents, then in the 2nd loop we do the adjustment | |
2022 | * while adding parents of the parents to our ulist. | |
2023 | */ | |
2024 | list_for_each_entry(glist, &qg->groups, next_group) { | |
f90e579c | 2025 | err = ulist_add(parents, glist->group->qgroupid, |
1152651a | 2026 | ptr_to_u64(glist->group), GFP_ATOMIC); |
f90e579c MF |
2027 | if (err < 0) { |
2028 | ret = err; | |
1152651a | 2029 | goto out_unlock; |
f90e579c | 2030 | } |
1152651a MF |
2031 | } |
2032 | ||
2033 | ULIST_ITER_INIT(&uiter); | |
2034 | while ((unode = ulist_next(parents, &uiter))) { | |
2035 | qg = u64_to_ptr(unode->aux); | |
2036 | qg->excl += oper->num_bytes; | |
2037 | qg->excl_cmpr += oper->num_bytes; | |
2038 | qgroup_dirty(fs_info, qg); | |
2039 | ||
2040 | /* Add any parents of the parents */ | |
2041 | list_for_each_entry(glist, &qg->groups, next_group) { | |
f90e579c | 2042 | err = ulist_add(parents, glist->group->qgroupid, |
1152651a | 2043 | ptr_to_u64(glist->group), GFP_ATOMIC); |
f90e579c MF |
2044 | if (err < 0) { |
2045 | ret = err; | |
1152651a | 2046 | goto out_unlock; |
f90e579c | 2047 | } |
1152651a MF |
2048 | } |
2049 | } | |
2050 | ||
2051 | out_unlock: | |
2052 | spin_unlock(&fs_info->qgroup_lock); | |
2053 | ||
2054 | out: | |
2055 | ulist_free(roots); | |
2056 | ulist_free(parents); | |
2057 | return ret; | |
2058 | } | |
2059 | ||
fcebe456 JB |
2060 | /* |
2061 | * btrfs_qgroup_account_ref is called for every ref that is added to or deleted | |
2062 | * from the fs. First, all roots referencing the extent are searched, and | |
2063 | * then the space is accounted accordingly to the different roots. The | |
2064 | * accounting algorithm works in 3 steps documented inline. | |
2065 | */ | |
2066 | static int btrfs_qgroup_account(struct btrfs_trans_handle *trans, | |
2067 | struct btrfs_fs_info *fs_info, | |
2068 | struct btrfs_qgroup_operation *oper) | |
2069 | { | |
2070 | int ret = 0; | |
2071 | ||
2072 | if (!fs_info->quota_enabled) | |
2073 | return 0; | |
2074 | ||
2075 | BUG_ON(!fs_info->quota_root); | |
2076 | ||
2077 | mutex_lock(&fs_info->qgroup_rescan_lock); | |
2078 | if (fs_info->qgroup_flags & BTRFS_QGROUP_STATUS_FLAG_RESCAN) { | |
2079 | if (fs_info->qgroup_rescan_progress.objectid <= oper->bytenr) { | |
2080 | mutex_unlock(&fs_info->qgroup_rescan_lock); | |
2081 | return 0; | |
2082 | } | |
2083 | } | |
2084 | mutex_unlock(&fs_info->qgroup_rescan_lock); | |
2085 | ||
2086 | ASSERT(is_fstree(oper->ref_root)); | |
2087 | ||
d3982100 MF |
2088 | trace_btrfs_qgroup_account(oper); |
2089 | ||
fcebe456 JB |
2090 | switch (oper->type) { |
2091 | case BTRFS_QGROUP_OPER_ADD_EXCL: | |
2092 | case BTRFS_QGROUP_OPER_SUB_EXCL: | |
2093 | ret = qgroup_excl_accounting(fs_info, oper); | |
2094 | break; | |
2095 | case BTRFS_QGROUP_OPER_ADD_SHARED: | |
2096 | case BTRFS_QGROUP_OPER_SUB_SHARED: | |
2097 | ret = qgroup_shared_accounting(trans, fs_info, oper); | |
2098 | break; | |
1152651a MF |
2099 | case BTRFS_QGROUP_OPER_SUB_SUBTREE: |
2100 | ret = qgroup_subtree_accounting(trans, fs_info, oper); | |
2101 | break; | |
fcebe456 JB |
2102 | default: |
2103 | ASSERT(0); | |
2104 | } | |
2105 | return ret; | |
2106 | } | |
bed92eae | 2107 | |
fcebe456 JB |
2108 | /* |
2109 | * Needs to be called everytime we run delayed refs, even if there is an error | |
2110 | * in order to cleanup outstanding operations. | |
2111 | */ | |
2112 | int btrfs_delayed_qgroup_accounting(struct btrfs_trans_handle *trans, | |
2113 | struct btrfs_fs_info *fs_info) | |
2114 | { | |
2115 | struct btrfs_qgroup_operation *oper; | |
2116 | int ret = 0; | |
2117 | ||
2118 | while (!list_empty(&trans->qgroup_ref_list)) { | |
2119 | oper = list_first_entry(&trans->qgroup_ref_list, | |
2120 | struct btrfs_qgroup_operation, list); | |
2121 | list_del_init(&oper->list); | |
2122 | if (!ret || !trans->aborted) | |
2123 | ret = btrfs_qgroup_account(trans, fs_info, oper); | |
2124 | spin_lock(&fs_info->qgroup_op_lock); | |
2125 | rb_erase(&oper->n, &fs_info->qgroup_op_tree); | |
2126 | spin_unlock(&fs_info->qgroup_op_lock); | |
2127 | btrfs_put_tree_mod_seq(fs_info, &oper->elem); | |
2128 | kfree(oper); | |
2129 | } | |
bed92eae AJ |
2130 | return ret; |
2131 | } | |
2132 | ||
2133 | /* | |
2134 | * called from commit_transaction. Writes all changed qgroups to disk. | |
2135 | */ | |
2136 | int btrfs_run_qgroups(struct btrfs_trans_handle *trans, | |
2137 | struct btrfs_fs_info *fs_info) | |
2138 | { | |
2139 | struct btrfs_root *quota_root = fs_info->quota_root; | |
2140 | int ret = 0; | |
3d7b5a28 | 2141 | int start_rescan_worker = 0; |
bed92eae AJ |
2142 | |
2143 | if (!quota_root) | |
2144 | goto out; | |
2145 | ||
3d7b5a28 JS |
2146 | if (!fs_info->quota_enabled && fs_info->pending_quota_state) |
2147 | start_rescan_worker = 1; | |
2148 | ||
bed92eae AJ |
2149 | fs_info->quota_enabled = fs_info->pending_quota_state; |
2150 | ||
2151 | spin_lock(&fs_info->qgroup_lock); | |
2152 | while (!list_empty(&fs_info->dirty_qgroups)) { | |
2153 | struct btrfs_qgroup *qgroup; | |
2154 | qgroup = list_first_entry(&fs_info->dirty_qgroups, | |
2155 | struct btrfs_qgroup, dirty); | |
2156 | list_del_init(&qgroup->dirty); | |
2157 | spin_unlock(&fs_info->qgroup_lock); | |
2158 | ret = update_qgroup_info_item(trans, quota_root, qgroup); | |
d3001ed3 DY |
2159 | if (ret) |
2160 | fs_info->qgroup_flags |= | |
2161 | BTRFS_QGROUP_STATUS_FLAG_INCONSISTENT; | |
2162 | ret = update_qgroup_limit_item(trans, quota_root, qgroup); | |
bed92eae AJ |
2163 | if (ret) |
2164 | fs_info->qgroup_flags |= | |
2165 | BTRFS_QGROUP_STATUS_FLAG_INCONSISTENT; | |
2166 | spin_lock(&fs_info->qgroup_lock); | |
2167 | } | |
2168 | if (fs_info->quota_enabled) | |
2169 | fs_info->qgroup_flags |= BTRFS_QGROUP_STATUS_FLAG_ON; | |
2170 | else | |
2171 | fs_info->qgroup_flags &= ~BTRFS_QGROUP_STATUS_FLAG_ON; | |
2172 | spin_unlock(&fs_info->qgroup_lock); | |
2173 | ||
2174 | ret = update_qgroup_status_item(trans, fs_info, quota_root); | |
2175 | if (ret) | |
2176 | fs_info->qgroup_flags |= BTRFS_QGROUP_STATUS_FLAG_INCONSISTENT; | |
2177 | ||
3d7b5a28 | 2178 | if (!ret && start_rescan_worker) { |
b382a324 JS |
2179 | ret = qgroup_rescan_init(fs_info, 0, 1); |
2180 | if (!ret) { | |
2181 | qgroup_rescan_zero_tracking(fs_info); | |
fc97fab0 QW |
2182 | btrfs_queue_work(fs_info->qgroup_rescan_workers, |
2183 | &fs_info->qgroup_rescan_work); | |
b382a324 | 2184 | } |
3d7b5a28 JS |
2185 | ret = 0; |
2186 | } | |
2187 | ||
bed92eae AJ |
2188 | out: |
2189 | ||
2190 | return ret; | |
2191 | } | |
2192 | ||
2193 | /* | |
2194 | * copy the acounting information between qgroups. This is necessary when a | |
2195 | * snapshot or a subvolume is created | |
2196 | */ | |
2197 | int btrfs_qgroup_inherit(struct btrfs_trans_handle *trans, | |
2198 | struct btrfs_fs_info *fs_info, u64 srcid, u64 objectid, | |
2199 | struct btrfs_qgroup_inherit *inherit) | |
2200 | { | |
2201 | int ret = 0; | |
2202 | int i; | |
2203 | u64 *i_qgroups; | |
2204 | struct btrfs_root *quota_root = fs_info->quota_root; | |
2205 | struct btrfs_qgroup *srcgroup; | |
2206 | struct btrfs_qgroup *dstgroup; | |
2207 | u32 level_size = 0; | |
3f5e2d3b | 2208 | u64 nums; |
bed92eae | 2209 | |
f2f6ed3d | 2210 | mutex_lock(&fs_info->qgroup_ioctl_lock); |
bed92eae | 2211 | if (!fs_info->quota_enabled) |
f2f6ed3d | 2212 | goto out; |
bed92eae | 2213 | |
f2f6ed3d WS |
2214 | if (!quota_root) { |
2215 | ret = -EINVAL; | |
2216 | goto out; | |
2217 | } | |
bed92eae | 2218 | |
3f5e2d3b WS |
2219 | if (inherit) { |
2220 | i_qgroups = (u64 *)(inherit + 1); | |
2221 | nums = inherit->num_qgroups + 2 * inherit->num_ref_copies + | |
2222 | 2 * inherit->num_excl_copies; | |
2223 | for (i = 0; i < nums; ++i) { | |
2224 | srcgroup = find_qgroup_rb(fs_info, *i_qgroups); | |
2225 | if (!srcgroup) { | |
2226 | ret = -EINVAL; | |
2227 | goto out; | |
2228 | } | |
2229 | ++i_qgroups; | |
2230 | } | |
2231 | } | |
2232 | ||
bed92eae AJ |
2233 | /* |
2234 | * create a tracking group for the subvol itself | |
2235 | */ | |
2236 | ret = add_qgroup_item(trans, quota_root, objectid); | |
2237 | if (ret) | |
2238 | goto out; | |
2239 | ||
bed92eae AJ |
2240 | if (srcid) { |
2241 | struct btrfs_root *srcroot; | |
2242 | struct btrfs_key srckey; | |
bed92eae AJ |
2243 | |
2244 | srckey.objectid = srcid; | |
2245 | srckey.type = BTRFS_ROOT_ITEM_KEY; | |
2246 | srckey.offset = (u64)-1; | |
2247 | srcroot = btrfs_read_fs_root_no_name(fs_info, &srckey); | |
2248 | if (IS_ERR(srcroot)) { | |
2249 | ret = PTR_ERR(srcroot); | |
2250 | goto out; | |
2251 | } | |
2252 | ||
2253 | rcu_read_lock(); | |
707e8a07 | 2254 | level_size = srcroot->nodesize; |
bed92eae AJ |
2255 | rcu_read_unlock(); |
2256 | } | |
2257 | ||
2258 | /* | |
2259 | * add qgroup to all inherited groups | |
2260 | */ | |
2261 | if (inherit) { | |
2262 | i_qgroups = (u64 *)(inherit + 1); | |
2263 | for (i = 0; i < inherit->num_qgroups; ++i) { | |
2264 | ret = add_qgroup_relation_item(trans, quota_root, | |
2265 | objectid, *i_qgroups); | |
2266 | if (ret) | |
2267 | goto out; | |
2268 | ret = add_qgroup_relation_item(trans, quota_root, | |
2269 | *i_qgroups, objectid); | |
2270 | if (ret) | |
2271 | goto out; | |
2272 | ++i_qgroups; | |
2273 | } | |
2274 | } | |
2275 | ||
2276 | ||
2277 | spin_lock(&fs_info->qgroup_lock); | |
2278 | ||
2279 | dstgroup = add_qgroup_rb(fs_info, objectid); | |
57a5a882 DC |
2280 | if (IS_ERR(dstgroup)) { |
2281 | ret = PTR_ERR(dstgroup); | |
bed92eae | 2282 | goto unlock; |
57a5a882 | 2283 | } |
bed92eae | 2284 | |
e8c8541a | 2285 | if (inherit && inherit->flags & BTRFS_QGROUP_INHERIT_SET_LIMITS) { |
e8c8541a DY |
2286 | dstgroup->lim_flags = inherit->lim.flags; |
2287 | dstgroup->max_rfer = inherit->lim.max_rfer; | |
2288 | dstgroup->max_excl = inherit->lim.max_excl; | |
2289 | dstgroup->rsv_rfer = inherit->lim.rsv_rfer; | |
2290 | dstgroup->rsv_excl = inherit->lim.rsv_excl; | |
1510e71c DY |
2291 | |
2292 | ret = update_qgroup_limit_item(trans, quota_root, dstgroup); | |
2293 | if (ret) { | |
2294 | fs_info->qgroup_flags |= BTRFS_QGROUP_STATUS_FLAG_INCONSISTENT; | |
2295 | btrfs_info(fs_info, "unable to update quota limit for %llu", | |
2296 | dstgroup->qgroupid); | |
2297 | goto unlock; | |
2298 | } | |
e8c8541a DY |
2299 | } |
2300 | ||
bed92eae AJ |
2301 | if (srcid) { |
2302 | srcgroup = find_qgroup_rb(fs_info, srcid); | |
f3a87f1b | 2303 | if (!srcgroup) |
bed92eae | 2304 | goto unlock; |
fcebe456 JB |
2305 | |
2306 | /* | |
2307 | * We call inherit after we clone the root in order to make sure | |
2308 | * our counts don't go crazy, so at this point the only | |
2309 | * difference between the two roots should be the root node. | |
2310 | */ | |
2311 | dstgroup->rfer = srcgroup->rfer; | |
2312 | dstgroup->rfer_cmpr = srcgroup->rfer_cmpr; | |
2313 | dstgroup->excl = level_size; | |
2314 | dstgroup->excl_cmpr = level_size; | |
bed92eae AJ |
2315 | srcgroup->excl = level_size; |
2316 | srcgroup->excl_cmpr = level_size; | |
3eeb4d59 DY |
2317 | |
2318 | /* inherit the limit info */ | |
2319 | dstgroup->lim_flags = srcgroup->lim_flags; | |
2320 | dstgroup->max_rfer = srcgroup->max_rfer; | |
2321 | dstgroup->max_excl = srcgroup->max_excl; | |
2322 | dstgroup->rsv_rfer = srcgroup->rsv_rfer; | |
2323 | dstgroup->rsv_excl = srcgroup->rsv_excl; | |
2324 | ||
bed92eae AJ |
2325 | qgroup_dirty(fs_info, dstgroup); |
2326 | qgroup_dirty(fs_info, srcgroup); | |
2327 | } | |
2328 | ||
f3a87f1b | 2329 | if (!inherit) |
bed92eae AJ |
2330 | goto unlock; |
2331 | ||
2332 | i_qgroups = (u64 *)(inherit + 1); | |
2333 | for (i = 0; i < inherit->num_qgroups; ++i) { | |
2334 | ret = add_relation_rb(quota_root->fs_info, objectid, | |
2335 | *i_qgroups); | |
2336 | if (ret) | |
2337 | goto unlock; | |
2338 | ++i_qgroups; | |
2339 | } | |
2340 | ||
2341 | for (i = 0; i < inherit->num_ref_copies; ++i) { | |
2342 | struct btrfs_qgroup *src; | |
2343 | struct btrfs_qgroup *dst; | |
2344 | ||
2345 | src = find_qgroup_rb(fs_info, i_qgroups[0]); | |
2346 | dst = find_qgroup_rb(fs_info, i_qgroups[1]); | |
2347 | ||
2348 | if (!src || !dst) { | |
2349 | ret = -EINVAL; | |
2350 | goto unlock; | |
2351 | } | |
2352 | ||
2353 | dst->rfer = src->rfer - level_size; | |
2354 | dst->rfer_cmpr = src->rfer_cmpr - level_size; | |
2355 | i_qgroups += 2; | |
2356 | } | |
2357 | for (i = 0; i < inherit->num_excl_copies; ++i) { | |
2358 | struct btrfs_qgroup *src; | |
2359 | struct btrfs_qgroup *dst; | |
2360 | ||
2361 | src = find_qgroup_rb(fs_info, i_qgroups[0]); | |
2362 | dst = find_qgroup_rb(fs_info, i_qgroups[1]); | |
2363 | ||
2364 | if (!src || !dst) { | |
2365 | ret = -EINVAL; | |
2366 | goto unlock; | |
2367 | } | |
2368 | ||
2369 | dst->excl = src->excl + level_size; | |
2370 | dst->excl_cmpr = src->excl_cmpr + level_size; | |
2371 | i_qgroups += 2; | |
2372 | } | |
2373 | ||
2374 | unlock: | |
2375 | spin_unlock(&fs_info->qgroup_lock); | |
2376 | out: | |
f2f6ed3d | 2377 | mutex_unlock(&fs_info->qgroup_ioctl_lock); |
bed92eae AJ |
2378 | return ret; |
2379 | } | |
2380 | ||
2381 | /* | |
2382 | * reserve some space for a qgroup and all its parents. The reservation takes | |
2383 | * place with start_transaction or dealloc_reserve, similar to ENOSPC | |
2384 | * accounting. If not enough space is available, EDQUOT is returned. | |
2385 | * We assume that the requested space is new for all qgroups. | |
2386 | */ | |
2387 | int btrfs_qgroup_reserve(struct btrfs_root *root, u64 num_bytes) | |
2388 | { | |
2389 | struct btrfs_root *quota_root; | |
2390 | struct btrfs_qgroup *qgroup; | |
2391 | struct btrfs_fs_info *fs_info = root->fs_info; | |
2392 | u64 ref_root = root->root_key.objectid; | |
2393 | int ret = 0; | |
bed92eae AJ |
2394 | struct ulist_node *unode; |
2395 | struct ulist_iterator uiter; | |
2396 | ||
2397 | if (!is_fstree(ref_root)) | |
2398 | return 0; | |
2399 | ||
2400 | if (num_bytes == 0) | |
2401 | return 0; | |
2402 | ||
2403 | spin_lock(&fs_info->qgroup_lock); | |
2404 | quota_root = fs_info->quota_root; | |
2405 | if (!quota_root) | |
2406 | goto out; | |
2407 | ||
2408 | qgroup = find_qgroup_rb(fs_info, ref_root); | |
2409 | if (!qgroup) | |
2410 | goto out; | |
2411 | ||
2412 | /* | |
2413 | * in a first step, we check all affected qgroups if any limits would | |
2414 | * be exceeded | |
2415 | */ | |
1e8f9158 WS |
2416 | ulist_reinit(fs_info->qgroup_ulist); |
2417 | ret = ulist_add(fs_info->qgroup_ulist, qgroup->qgroupid, | |
3c97185c WS |
2418 | (uintptr_t)qgroup, GFP_ATOMIC); |
2419 | if (ret < 0) | |
2420 | goto out; | |
bed92eae | 2421 | ULIST_ITER_INIT(&uiter); |
1e8f9158 | 2422 | while ((unode = ulist_next(fs_info->qgroup_ulist, &uiter))) { |
bed92eae AJ |
2423 | struct btrfs_qgroup *qg; |
2424 | struct btrfs_qgroup_list *glist; | |
2425 | ||
fcebe456 | 2426 | qg = u64_to_ptr(unode->aux); |
bed92eae AJ |
2427 | |
2428 | if ((qg->lim_flags & BTRFS_QGROUP_LIMIT_MAX_RFER) && | |
b4fcd6be | 2429 | qg->reserved + (s64)qg->rfer + num_bytes > |
720f1e20 | 2430 | qg->max_rfer) { |
bed92eae | 2431 | ret = -EDQUOT; |
720f1e20 WS |
2432 | goto out; |
2433 | } | |
bed92eae AJ |
2434 | |
2435 | if ((qg->lim_flags & BTRFS_QGROUP_LIMIT_MAX_EXCL) && | |
b4fcd6be | 2436 | qg->reserved + (s64)qg->excl + num_bytes > |
720f1e20 | 2437 | qg->max_excl) { |
bed92eae | 2438 | ret = -EDQUOT; |
720f1e20 WS |
2439 | goto out; |
2440 | } | |
bed92eae AJ |
2441 | |
2442 | list_for_each_entry(glist, &qg->groups, next_group) { | |
1e8f9158 WS |
2443 | ret = ulist_add(fs_info->qgroup_ulist, |
2444 | glist->group->qgroupid, | |
3c97185c WS |
2445 | (uintptr_t)glist->group, GFP_ATOMIC); |
2446 | if (ret < 0) | |
2447 | goto out; | |
bed92eae AJ |
2448 | } |
2449 | } | |
3c97185c | 2450 | ret = 0; |
bed92eae AJ |
2451 | /* |
2452 | * no limits exceeded, now record the reservation into all qgroups | |
2453 | */ | |
2454 | ULIST_ITER_INIT(&uiter); | |
1e8f9158 | 2455 | while ((unode = ulist_next(fs_info->qgroup_ulist, &uiter))) { |
bed92eae AJ |
2456 | struct btrfs_qgroup *qg; |
2457 | ||
fcebe456 | 2458 | qg = u64_to_ptr(unode->aux); |
bed92eae AJ |
2459 | |
2460 | qg->reserved += num_bytes; | |
2461 | } | |
2462 | ||
2463 | out: | |
2464 | spin_unlock(&fs_info->qgroup_lock); | |
bed92eae AJ |
2465 | return ret; |
2466 | } | |
2467 | ||
2468 | void btrfs_qgroup_free(struct btrfs_root *root, u64 num_bytes) | |
2469 | { | |
2470 | struct btrfs_root *quota_root; | |
2471 | struct btrfs_qgroup *qgroup; | |
2472 | struct btrfs_fs_info *fs_info = root->fs_info; | |
bed92eae AJ |
2473 | struct ulist_node *unode; |
2474 | struct ulist_iterator uiter; | |
2475 | u64 ref_root = root->root_key.objectid; | |
3c97185c | 2476 | int ret = 0; |
bed92eae AJ |
2477 | |
2478 | if (!is_fstree(ref_root)) | |
2479 | return; | |
2480 | ||
2481 | if (num_bytes == 0) | |
2482 | return; | |
2483 | ||
2484 | spin_lock(&fs_info->qgroup_lock); | |
2485 | ||
2486 | quota_root = fs_info->quota_root; | |
2487 | if (!quota_root) | |
2488 | goto out; | |
2489 | ||
2490 | qgroup = find_qgroup_rb(fs_info, ref_root); | |
2491 | if (!qgroup) | |
2492 | goto out; | |
2493 | ||
1e8f9158 WS |
2494 | ulist_reinit(fs_info->qgroup_ulist); |
2495 | ret = ulist_add(fs_info->qgroup_ulist, qgroup->qgroupid, | |
3c97185c WS |
2496 | (uintptr_t)qgroup, GFP_ATOMIC); |
2497 | if (ret < 0) | |
2498 | goto out; | |
bed92eae | 2499 | ULIST_ITER_INIT(&uiter); |
1e8f9158 | 2500 | while ((unode = ulist_next(fs_info->qgroup_ulist, &uiter))) { |
bed92eae AJ |
2501 | struct btrfs_qgroup *qg; |
2502 | struct btrfs_qgroup_list *glist; | |
2503 | ||
fcebe456 | 2504 | qg = u64_to_ptr(unode->aux); |
bed92eae AJ |
2505 | |
2506 | qg->reserved -= num_bytes; | |
2507 | ||
2508 | list_for_each_entry(glist, &qg->groups, next_group) { | |
1e8f9158 WS |
2509 | ret = ulist_add(fs_info->qgroup_ulist, |
2510 | glist->group->qgroupid, | |
3c97185c WS |
2511 | (uintptr_t)glist->group, GFP_ATOMIC); |
2512 | if (ret < 0) | |
2513 | goto out; | |
bed92eae AJ |
2514 | } |
2515 | } | |
2516 | ||
2517 | out: | |
2518 | spin_unlock(&fs_info->qgroup_lock); | |
bed92eae AJ |
2519 | } |
2520 | ||
2521 | void assert_qgroups_uptodate(struct btrfs_trans_handle *trans) | |
2522 | { | |
2523 | if (list_empty(&trans->qgroup_ref_list) && !trans->delayed_ref_elem.seq) | |
2524 | return; | |
efe120a0 FH |
2525 | btrfs_err(trans->root->fs_info, |
2526 | "qgroups not uptodate in trans handle %p: list is%s empty, " | |
2527 | "seq is %#x.%x", | |
bed92eae | 2528 | trans, list_empty(&trans->qgroup_ref_list) ? "" : " not", |
fc36ed7e JS |
2529 | (u32)(trans->delayed_ref_elem.seq >> 32), |
2530 | (u32)trans->delayed_ref_elem.seq); | |
bed92eae AJ |
2531 | BUG(); |
2532 | } | |
2f232036 JS |
2533 | |
2534 | /* | |
2535 | * returns < 0 on error, 0 when more leafs are to be scanned. | |
2536 | * returns 1 when done, 2 when done and FLAG_INCONSISTENT was cleared. | |
2537 | */ | |
2538 | static int | |
b382a324 | 2539 | qgroup_rescan_leaf(struct btrfs_fs_info *fs_info, struct btrfs_path *path, |
fcebe456 JB |
2540 | struct btrfs_trans_handle *trans, struct ulist *qgroups, |
2541 | struct ulist *tmp, struct extent_buffer *scratch_leaf) | |
2f232036 JS |
2542 | { |
2543 | struct btrfs_key found; | |
2f232036 | 2544 | struct ulist *roots = NULL; |
3284da7b | 2545 | struct seq_list tree_mod_seq_elem = SEQ_LIST_INIT(tree_mod_seq_elem); |
fcebe456 | 2546 | u64 num_bytes; |
2f232036 | 2547 | u64 seq; |
fcebe456 | 2548 | int new_roots; |
2f232036 JS |
2549 | int slot; |
2550 | int ret; | |
2551 | ||
2552 | path->leave_spinning = 1; | |
2553 | mutex_lock(&fs_info->qgroup_rescan_lock); | |
2554 | ret = btrfs_search_slot_for_read(fs_info->extent_root, | |
2555 | &fs_info->qgroup_rescan_progress, | |
2556 | path, 1, 0); | |
2557 | ||
2558 | pr_debug("current progress key (%llu %u %llu), search_slot ret %d\n", | |
c1c9ff7c | 2559 | fs_info->qgroup_rescan_progress.objectid, |
2f232036 | 2560 | fs_info->qgroup_rescan_progress.type, |
c1c9ff7c | 2561 | fs_info->qgroup_rescan_progress.offset, ret); |
2f232036 JS |
2562 | |
2563 | if (ret) { | |
2564 | /* | |
2565 | * The rescan is about to end, we will not be scanning any | |
2566 | * further blocks. We cannot unset the RESCAN flag here, because | |
2567 | * we want to commit the transaction if everything went well. | |
2568 | * To make the live accounting work in this phase, we set our | |
2569 | * scan progress pointer such that every real extent objectid | |
2570 | * will be smaller. | |
2571 | */ | |
2572 | fs_info->qgroup_rescan_progress.objectid = (u64)-1; | |
2573 | btrfs_release_path(path); | |
2574 | mutex_unlock(&fs_info->qgroup_rescan_lock); | |
2575 | return ret; | |
2576 | } | |
2577 | ||
2578 | btrfs_item_key_to_cpu(path->nodes[0], &found, | |
2579 | btrfs_header_nritems(path->nodes[0]) - 1); | |
2580 | fs_info->qgroup_rescan_progress.objectid = found.objectid + 1; | |
2581 | ||
2582 | btrfs_get_tree_mod_seq(fs_info, &tree_mod_seq_elem); | |
2583 | memcpy(scratch_leaf, path->nodes[0], sizeof(*scratch_leaf)); | |
2584 | slot = path->slots[0]; | |
2585 | btrfs_release_path(path); | |
2586 | mutex_unlock(&fs_info->qgroup_rescan_lock); | |
2587 | ||
2588 | for (; slot < btrfs_header_nritems(scratch_leaf); ++slot) { | |
2589 | btrfs_item_key_to_cpu(scratch_leaf, &found, slot); | |
3a6d75e8 JB |
2590 | if (found.type != BTRFS_EXTENT_ITEM_KEY && |
2591 | found.type != BTRFS_METADATA_ITEM_KEY) | |
2f232036 | 2592 | continue; |
3a6d75e8 | 2593 | if (found.type == BTRFS_METADATA_ITEM_KEY) |
707e8a07 | 2594 | num_bytes = fs_info->extent_root->nodesize; |
3a6d75e8 JB |
2595 | else |
2596 | num_bytes = found.offset; | |
2597 | ||
fcebe456 JB |
2598 | ulist_reinit(qgroups); |
2599 | ret = btrfs_find_all_roots(NULL, fs_info, found.objectid, 0, | |
2600 | &roots); | |
2f232036 JS |
2601 | if (ret < 0) |
2602 | goto out; | |
2603 | spin_lock(&fs_info->qgroup_lock); | |
2604 | seq = fs_info->qgroup_seq; | |
2605 | fs_info->qgroup_seq += roots->nnodes + 1; /* max refcnt */ | |
2606 | ||
fcebe456 JB |
2607 | new_roots = 0; |
2608 | ret = qgroup_calc_old_refcnt(fs_info, 0, tmp, roots, qgroups, | |
2609 | seq, &new_roots, 1); | |
2610 | if (ret < 0) { | |
2f232036 JS |
2611 | spin_unlock(&fs_info->qgroup_lock); |
2612 | ulist_free(roots); | |
2613 | goto out; | |
2614 | } | |
2615 | ||
fcebe456 JB |
2616 | ret = qgroup_adjust_counters(fs_info, 0, num_bytes, qgroups, |
2617 | seq, 0, new_roots, 1); | |
2618 | if (ret < 0) { | |
2619 | spin_unlock(&fs_info->qgroup_lock); | |
2620 | ulist_free(roots); | |
2621 | goto out; | |
2f232036 | 2622 | } |
2f232036 JS |
2623 | spin_unlock(&fs_info->qgroup_lock); |
2624 | ulist_free(roots); | |
2f232036 | 2625 | } |
2f232036 JS |
2626 | out: |
2627 | btrfs_put_tree_mod_seq(fs_info, &tree_mod_seq_elem); | |
2628 | ||
2629 | return ret; | |
2630 | } | |
2631 | ||
d458b054 | 2632 | static void btrfs_qgroup_rescan_worker(struct btrfs_work *work) |
2f232036 | 2633 | { |
b382a324 JS |
2634 | struct btrfs_fs_info *fs_info = container_of(work, struct btrfs_fs_info, |
2635 | qgroup_rescan_work); | |
2f232036 JS |
2636 | struct btrfs_path *path; |
2637 | struct btrfs_trans_handle *trans = NULL; | |
fcebe456 | 2638 | struct ulist *tmp = NULL, *qgroups = NULL; |
2f232036 JS |
2639 | struct extent_buffer *scratch_leaf = NULL; |
2640 | int err = -ENOMEM; | |
2641 | ||
2642 | path = btrfs_alloc_path(); | |
2643 | if (!path) | |
2644 | goto out; | |
fcebe456 JB |
2645 | qgroups = ulist_alloc(GFP_NOFS); |
2646 | if (!qgroups) | |
2647 | goto out; | |
2f232036 JS |
2648 | tmp = ulist_alloc(GFP_NOFS); |
2649 | if (!tmp) | |
2650 | goto out; | |
2651 | scratch_leaf = kmalloc(sizeof(*scratch_leaf), GFP_NOFS); | |
2652 | if (!scratch_leaf) | |
2653 | goto out; | |
2654 | ||
2655 | err = 0; | |
2656 | while (!err) { | |
2657 | trans = btrfs_start_transaction(fs_info->fs_root, 0); | |
2658 | if (IS_ERR(trans)) { | |
2659 | err = PTR_ERR(trans); | |
2660 | break; | |
2661 | } | |
2662 | if (!fs_info->quota_enabled) { | |
2663 | err = -EINTR; | |
2664 | } else { | |
b382a324 | 2665 | err = qgroup_rescan_leaf(fs_info, path, trans, |
fcebe456 | 2666 | qgroups, tmp, scratch_leaf); |
2f232036 JS |
2667 | } |
2668 | if (err > 0) | |
2669 | btrfs_commit_transaction(trans, fs_info->fs_root); | |
2670 | else | |
2671 | btrfs_end_transaction(trans, fs_info->fs_root); | |
2672 | } | |
2673 | ||
2674 | out: | |
2675 | kfree(scratch_leaf); | |
fcebe456 | 2676 | ulist_free(qgroups); |
2a108409 | 2677 | ulist_free(tmp); |
2f232036 | 2678 | btrfs_free_path(path); |
2f232036 JS |
2679 | |
2680 | mutex_lock(&fs_info->qgroup_rescan_lock); | |
2681 | fs_info->qgroup_flags &= ~BTRFS_QGROUP_STATUS_FLAG_RESCAN; | |
2682 | ||
2683 | if (err == 2 && | |
2684 | fs_info->qgroup_flags & BTRFS_QGROUP_STATUS_FLAG_INCONSISTENT) { | |
2685 | fs_info->qgroup_flags &= ~BTRFS_QGROUP_STATUS_FLAG_INCONSISTENT; | |
2686 | } else if (err < 0) { | |
2687 | fs_info->qgroup_flags |= BTRFS_QGROUP_STATUS_FLAG_INCONSISTENT; | |
2688 | } | |
2689 | mutex_unlock(&fs_info->qgroup_rescan_lock); | |
2690 | ||
2691 | if (err >= 0) { | |
efe120a0 | 2692 | btrfs_info(fs_info, "qgroup scan completed%s", |
2f232036 JS |
2693 | err == 2 ? " (inconsistency flag cleared)" : ""); |
2694 | } else { | |
efe120a0 | 2695 | btrfs_err(fs_info, "qgroup scan failed with %d", err); |
2f232036 | 2696 | } |
57254b6e JS |
2697 | |
2698 | complete_all(&fs_info->qgroup_rescan_completion); | |
2f232036 JS |
2699 | } |
2700 | ||
b382a324 JS |
2701 | /* |
2702 | * Checks that (a) no rescan is running and (b) quota is enabled. Allocates all | |
2703 | * memory required for the rescan context. | |
2704 | */ | |
2705 | static int | |
2706 | qgroup_rescan_init(struct btrfs_fs_info *fs_info, u64 progress_objectid, | |
2707 | int init_flags) | |
2f232036 JS |
2708 | { |
2709 | int ret = 0; | |
2f232036 | 2710 | |
b382a324 JS |
2711 | if (!init_flags && |
2712 | (!(fs_info->qgroup_flags & BTRFS_QGROUP_STATUS_FLAG_RESCAN) || | |
2713 | !(fs_info->qgroup_flags & BTRFS_QGROUP_STATUS_FLAG_ON))) { | |
2714 | ret = -EINVAL; | |
2715 | goto err; | |
2716 | } | |
2f232036 JS |
2717 | |
2718 | mutex_lock(&fs_info->qgroup_rescan_lock); | |
2719 | spin_lock(&fs_info->qgroup_lock); | |
b382a324 JS |
2720 | |
2721 | if (init_flags) { | |
2722 | if (fs_info->qgroup_flags & BTRFS_QGROUP_STATUS_FLAG_RESCAN) | |
2723 | ret = -EINPROGRESS; | |
2724 | else if (!(fs_info->qgroup_flags & BTRFS_QGROUP_STATUS_FLAG_ON)) | |
2725 | ret = -EINVAL; | |
2726 | ||
2727 | if (ret) { | |
2728 | spin_unlock(&fs_info->qgroup_lock); | |
2729 | mutex_unlock(&fs_info->qgroup_rescan_lock); | |
2730 | goto err; | |
2731 | } | |
2732 | ||
2733 | fs_info->qgroup_flags |= BTRFS_QGROUP_STATUS_FLAG_RESCAN; | |
2f232036 JS |
2734 | } |
2735 | ||
2f232036 JS |
2736 | memset(&fs_info->qgroup_rescan_progress, 0, |
2737 | sizeof(fs_info->qgroup_rescan_progress)); | |
b382a324 JS |
2738 | fs_info->qgroup_rescan_progress.objectid = progress_objectid; |
2739 | ||
2740 | spin_unlock(&fs_info->qgroup_lock); | |
2741 | mutex_unlock(&fs_info->qgroup_rescan_lock); | |
2742 | ||
57254b6e | 2743 | init_completion(&fs_info->qgroup_rescan_completion); |
2f232036 | 2744 | |
b382a324 JS |
2745 | memset(&fs_info->qgroup_rescan_work, 0, |
2746 | sizeof(fs_info->qgroup_rescan_work)); | |
fc97fab0 | 2747 | btrfs_init_work(&fs_info->qgroup_rescan_work, |
9e0af237 | 2748 | btrfs_qgroup_rescan_helper, |
fc97fab0 | 2749 | btrfs_qgroup_rescan_worker, NULL, NULL); |
b382a324 JS |
2750 | |
2751 | if (ret) { | |
2752 | err: | |
efe120a0 | 2753 | btrfs_info(fs_info, "qgroup_rescan_init failed with %d", ret); |
b382a324 JS |
2754 | return ret; |
2755 | } | |
2756 | ||
2757 | return 0; | |
2758 | } | |
2759 | ||
2760 | static void | |
2761 | qgroup_rescan_zero_tracking(struct btrfs_fs_info *fs_info) | |
2762 | { | |
2763 | struct rb_node *n; | |
2764 | struct btrfs_qgroup *qgroup; | |
2765 | ||
2766 | spin_lock(&fs_info->qgroup_lock); | |
2f232036 JS |
2767 | /* clear all current qgroup tracking information */ |
2768 | for (n = rb_first(&fs_info->qgroup_tree); n; n = rb_next(n)) { | |
2769 | qgroup = rb_entry(n, struct btrfs_qgroup, node); | |
2770 | qgroup->rfer = 0; | |
2771 | qgroup->rfer_cmpr = 0; | |
2772 | qgroup->excl = 0; | |
2773 | qgroup->excl_cmpr = 0; | |
2774 | } | |
2775 | spin_unlock(&fs_info->qgroup_lock); | |
b382a324 | 2776 | } |
2f232036 | 2777 | |
b382a324 JS |
2778 | int |
2779 | btrfs_qgroup_rescan(struct btrfs_fs_info *fs_info) | |
2780 | { | |
2781 | int ret = 0; | |
2782 | struct btrfs_trans_handle *trans; | |
2783 | ||
2784 | ret = qgroup_rescan_init(fs_info, 0, 1); | |
2785 | if (ret) | |
2786 | return ret; | |
2787 | ||
2788 | /* | |
2789 | * We have set the rescan_progress to 0, which means no more | |
2790 | * delayed refs will be accounted by btrfs_qgroup_account_ref. | |
2791 | * However, btrfs_qgroup_account_ref may be right after its call | |
2792 | * to btrfs_find_all_roots, in which case it would still do the | |
2793 | * accounting. | |
2794 | * To solve this, we're committing the transaction, which will | |
2795 | * ensure we run all delayed refs and only after that, we are | |
2796 | * going to clear all tracking information for a clean start. | |
2797 | */ | |
2798 | ||
2799 | trans = btrfs_join_transaction(fs_info->fs_root); | |
2800 | if (IS_ERR(trans)) { | |
2801 | fs_info->qgroup_flags &= ~BTRFS_QGROUP_STATUS_FLAG_RESCAN; | |
2802 | return PTR_ERR(trans); | |
2803 | } | |
2804 | ret = btrfs_commit_transaction(trans, fs_info->fs_root); | |
2805 | if (ret) { | |
2806 | fs_info->qgroup_flags &= ~BTRFS_QGROUP_STATUS_FLAG_RESCAN; | |
2807 | return ret; | |
2808 | } | |
2809 | ||
2810 | qgroup_rescan_zero_tracking(fs_info); | |
2811 | ||
fc97fab0 QW |
2812 | btrfs_queue_work(fs_info->qgroup_rescan_workers, |
2813 | &fs_info->qgroup_rescan_work); | |
2f232036 JS |
2814 | |
2815 | return 0; | |
2816 | } | |
57254b6e JS |
2817 | |
2818 | int btrfs_qgroup_wait_for_completion(struct btrfs_fs_info *fs_info) | |
2819 | { | |
2820 | int running; | |
2821 | int ret = 0; | |
2822 | ||
2823 | mutex_lock(&fs_info->qgroup_rescan_lock); | |
2824 | spin_lock(&fs_info->qgroup_lock); | |
2825 | running = fs_info->qgroup_flags & BTRFS_QGROUP_STATUS_FLAG_RESCAN; | |
2826 | spin_unlock(&fs_info->qgroup_lock); | |
2827 | mutex_unlock(&fs_info->qgroup_rescan_lock); | |
2828 | ||
2829 | if (running) | |
2830 | ret = wait_for_completion_interruptible( | |
2831 | &fs_info->qgroup_rescan_completion); | |
2832 | ||
2833 | return ret; | |
2834 | } | |
b382a324 JS |
2835 | |
2836 | /* | |
2837 | * this is only called from open_ctree where we're still single threaded, thus | |
2838 | * locking is omitted here. | |
2839 | */ | |
2840 | void | |
2841 | btrfs_qgroup_rescan_resume(struct btrfs_fs_info *fs_info) | |
2842 | { | |
2843 | if (fs_info->qgroup_flags & BTRFS_QGROUP_STATUS_FLAG_RESCAN) | |
fc97fab0 QW |
2844 | btrfs_queue_work(fs_info->qgroup_rescan_workers, |
2845 | &fs_info->qgroup_rescan_work); | |
b382a324 | 2846 | } |