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Merge tag 'clk-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git...
[deliverable/linux.git] / fs / btrfs / qgroup.c
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>
26 #include <linux/btrfs.h>
27
28 #include "ctree.h"
29 #include "transaction.h"
30 #include "disk-io.h"
31 #include "locking.h"
32 #include "ulist.h"
33 #include "backref.h"
34 #include "extent_io.h"
35 #include "qgroup.h"
36
37
38 /* TODO XXX FIXME
39 * - subvol delete -> delete when ref goes to 0? delete limits also?
40 * - reorganize keys
41 * - compressed
42 * - sync
43 * - copy also limits on subvol creation
44 * - limit
45 * - caches fuer ulists
46 * - performance benchmarks
47 * - check all ioctl parameters
48 */
49
50 /*
51 * one struct for each qgroup, organized in fs_info->qgroup_tree.
52 */
53 struct btrfs_qgroup {
54 u64 qgroupid;
55
56 /*
57 * state
58 */
59 u64 rfer; /* referenced */
60 u64 rfer_cmpr; /* referenced compressed */
61 u64 excl; /* exclusive */
62 u64 excl_cmpr; /* exclusive compressed */
63
64 /*
65 * limits
66 */
67 u64 lim_flags; /* which limits are set */
68 u64 max_rfer;
69 u64 max_excl;
70 u64 rsv_rfer;
71 u64 rsv_excl;
72
73 /*
74 * reservation tracking
75 */
76 u64 reserved;
77
78 /*
79 * lists
80 */
81 struct list_head groups; /* groups this group is member of */
82 struct list_head members; /* groups that are members of this group */
83 struct list_head dirty; /* dirty groups */
84 struct rb_node node; /* tree of qgroups */
85
86 /*
87 * temp variables for accounting operations
88 * Refer to qgroup_shared_accouting() for details.
89 */
90 u64 old_refcnt;
91 u64 new_refcnt;
92 };
93
94 static void btrfs_qgroup_update_old_refcnt(struct btrfs_qgroup *qg, u64 seq,
95 int mod)
96 {
97 if (qg->old_refcnt < seq)
98 qg->old_refcnt = seq;
99 qg->old_refcnt += mod;
100 }
101
102 static void btrfs_qgroup_update_new_refcnt(struct btrfs_qgroup *qg, u64 seq,
103 int mod)
104 {
105 if (qg->new_refcnt < seq)
106 qg->new_refcnt = seq;
107 qg->new_refcnt += mod;
108 }
109
110 static inline u64 btrfs_qgroup_get_old_refcnt(struct btrfs_qgroup *qg, u64 seq)
111 {
112 if (qg->old_refcnt < seq)
113 return 0;
114 return qg->old_refcnt - seq;
115 }
116
117 static inline u64 btrfs_qgroup_get_new_refcnt(struct btrfs_qgroup *qg, u64 seq)
118 {
119 if (qg->new_refcnt < seq)
120 return 0;
121 return qg->new_refcnt - seq;
122 }
123
124 /*
125 * glue structure to represent the relations between qgroups.
126 */
127 struct btrfs_qgroup_list {
128 struct list_head next_group;
129 struct list_head next_member;
130 struct btrfs_qgroup *group;
131 struct btrfs_qgroup *member;
132 };
133
134 #define ptr_to_u64(x) ((u64)(uintptr_t)x)
135 #define u64_to_ptr(x) ((struct btrfs_qgroup *)(uintptr_t)x)
136
137 static int
138 qgroup_rescan_init(struct btrfs_fs_info *fs_info, u64 progress_objectid,
139 int init_flags);
140 static void qgroup_rescan_zero_tracking(struct btrfs_fs_info *fs_info);
141
142 /* must be called with qgroup_ioctl_lock held */
143 static struct btrfs_qgroup *find_qgroup_rb(struct btrfs_fs_info *fs_info,
144 u64 qgroupid)
145 {
146 struct rb_node *n = fs_info->qgroup_tree.rb_node;
147 struct btrfs_qgroup *qgroup;
148
149 while (n) {
150 qgroup = rb_entry(n, struct btrfs_qgroup, node);
151 if (qgroup->qgroupid < qgroupid)
152 n = n->rb_left;
153 else if (qgroup->qgroupid > qgroupid)
154 n = n->rb_right;
155 else
156 return qgroup;
157 }
158 return NULL;
159 }
160
161 /* must be called with qgroup_lock held */
162 static struct btrfs_qgroup *add_qgroup_rb(struct btrfs_fs_info *fs_info,
163 u64 qgroupid)
164 {
165 struct rb_node **p = &fs_info->qgroup_tree.rb_node;
166 struct rb_node *parent = NULL;
167 struct btrfs_qgroup *qgroup;
168
169 while (*p) {
170 parent = *p;
171 qgroup = rb_entry(parent, struct btrfs_qgroup, node);
172
173 if (qgroup->qgroupid < qgroupid)
174 p = &(*p)->rb_left;
175 else if (qgroup->qgroupid > qgroupid)
176 p = &(*p)->rb_right;
177 else
178 return qgroup;
179 }
180
181 qgroup = kzalloc(sizeof(*qgroup), GFP_ATOMIC);
182 if (!qgroup)
183 return ERR_PTR(-ENOMEM);
184
185 qgroup->qgroupid = qgroupid;
186 INIT_LIST_HEAD(&qgroup->groups);
187 INIT_LIST_HEAD(&qgroup->members);
188 INIT_LIST_HEAD(&qgroup->dirty);
189
190 rb_link_node(&qgroup->node, parent, p);
191 rb_insert_color(&qgroup->node, &fs_info->qgroup_tree);
192
193 return qgroup;
194 }
195
196 static void __del_qgroup_rb(struct btrfs_qgroup *qgroup)
197 {
198 struct btrfs_qgroup_list *list;
199
200 list_del(&qgroup->dirty);
201 while (!list_empty(&qgroup->groups)) {
202 list = list_first_entry(&qgroup->groups,
203 struct btrfs_qgroup_list, next_group);
204 list_del(&list->next_group);
205 list_del(&list->next_member);
206 kfree(list);
207 }
208
209 while (!list_empty(&qgroup->members)) {
210 list = list_first_entry(&qgroup->members,
211 struct btrfs_qgroup_list, next_member);
212 list_del(&list->next_group);
213 list_del(&list->next_member);
214 kfree(list);
215 }
216 kfree(qgroup);
217 }
218
219 /* must be called with qgroup_lock held */
220 static int del_qgroup_rb(struct btrfs_fs_info *fs_info, u64 qgroupid)
221 {
222 struct btrfs_qgroup *qgroup = find_qgroup_rb(fs_info, qgroupid);
223
224 if (!qgroup)
225 return -ENOENT;
226
227 rb_erase(&qgroup->node, &fs_info->qgroup_tree);
228 __del_qgroup_rb(qgroup);
229 return 0;
230 }
231
232 /* must be called with qgroup_lock held */
233 static int add_relation_rb(struct btrfs_fs_info *fs_info,
234 u64 memberid, u64 parentid)
235 {
236 struct btrfs_qgroup *member;
237 struct btrfs_qgroup *parent;
238 struct btrfs_qgroup_list *list;
239
240 member = find_qgroup_rb(fs_info, memberid);
241 parent = find_qgroup_rb(fs_info, parentid);
242 if (!member || !parent)
243 return -ENOENT;
244
245 list = kzalloc(sizeof(*list), GFP_ATOMIC);
246 if (!list)
247 return -ENOMEM;
248
249 list->group = parent;
250 list->member = member;
251 list_add_tail(&list->next_group, &member->groups);
252 list_add_tail(&list->next_member, &parent->members);
253
254 return 0;
255 }
256
257 /* must be called with qgroup_lock held */
258 static int del_relation_rb(struct btrfs_fs_info *fs_info,
259 u64 memberid, u64 parentid)
260 {
261 struct btrfs_qgroup *member;
262 struct btrfs_qgroup *parent;
263 struct btrfs_qgroup_list *list;
264
265 member = find_qgroup_rb(fs_info, memberid);
266 parent = find_qgroup_rb(fs_info, parentid);
267 if (!member || !parent)
268 return -ENOENT;
269
270 list_for_each_entry(list, &member->groups, next_group) {
271 if (list->group == parent) {
272 list_del(&list->next_group);
273 list_del(&list->next_member);
274 kfree(list);
275 return 0;
276 }
277 }
278 return -ENOENT;
279 }
280
281 #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
282 int btrfs_verify_qgroup_counts(struct btrfs_fs_info *fs_info, u64 qgroupid,
283 u64 rfer, u64 excl)
284 {
285 struct btrfs_qgroup *qgroup;
286
287 qgroup = find_qgroup_rb(fs_info, qgroupid);
288 if (!qgroup)
289 return -EINVAL;
290 if (qgroup->rfer != rfer || qgroup->excl != excl)
291 return -EINVAL;
292 return 0;
293 }
294 #endif
295
296 /*
297 * The full config is read in one go, only called from open_ctree()
298 * It doesn't use any locking, as at this point we're still single-threaded
299 */
300 int btrfs_read_qgroup_config(struct btrfs_fs_info *fs_info)
301 {
302 struct btrfs_key key;
303 struct btrfs_key found_key;
304 struct btrfs_root *quota_root = fs_info->quota_root;
305 struct btrfs_path *path = NULL;
306 struct extent_buffer *l;
307 int slot;
308 int ret = 0;
309 u64 flags = 0;
310 u64 rescan_progress = 0;
311
312 if (!fs_info->quota_enabled)
313 return 0;
314
315 fs_info->qgroup_ulist = ulist_alloc(GFP_NOFS);
316 if (!fs_info->qgroup_ulist) {
317 ret = -ENOMEM;
318 goto out;
319 }
320
321 path = btrfs_alloc_path();
322 if (!path) {
323 ret = -ENOMEM;
324 goto out;
325 }
326
327 /* default this to quota off, in case no status key is found */
328 fs_info->qgroup_flags = 0;
329
330 /*
331 * pass 1: read status, all qgroup infos and limits
332 */
333 key.objectid = 0;
334 key.type = 0;
335 key.offset = 0;
336 ret = btrfs_search_slot_for_read(quota_root, &key, path, 1, 1);
337 if (ret)
338 goto out;
339
340 while (1) {
341 struct btrfs_qgroup *qgroup;
342
343 slot = path->slots[0];
344 l = path->nodes[0];
345 btrfs_item_key_to_cpu(l, &found_key, slot);
346
347 if (found_key.type == BTRFS_QGROUP_STATUS_KEY) {
348 struct btrfs_qgroup_status_item *ptr;
349
350 ptr = btrfs_item_ptr(l, slot,
351 struct btrfs_qgroup_status_item);
352
353 if (btrfs_qgroup_status_version(l, ptr) !=
354 BTRFS_QGROUP_STATUS_VERSION) {
355 btrfs_err(fs_info,
356 "old qgroup version, quota disabled");
357 goto out;
358 }
359 if (btrfs_qgroup_status_generation(l, ptr) !=
360 fs_info->generation) {
361 flags |= BTRFS_QGROUP_STATUS_FLAG_INCONSISTENT;
362 btrfs_err(fs_info,
363 "qgroup generation mismatch, "
364 "marked as inconsistent");
365 }
366 fs_info->qgroup_flags = btrfs_qgroup_status_flags(l,
367 ptr);
368 rescan_progress = btrfs_qgroup_status_rescan(l, ptr);
369 goto next1;
370 }
371
372 if (found_key.type != BTRFS_QGROUP_INFO_KEY &&
373 found_key.type != BTRFS_QGROUP_LIMIT_KEY)
374 goto next1;
375
376 qgroup = find_qgroup_rb(fs_info, found_key.offset);
377 if ((qgroup && found_key.type == BTRFS_QGROUP_INFO_KEY) ||
378 (!qgroup && found_key.type == BTRFS_QGROUP_LIMIT_KEY)) {
379 btrfs_err(fs_info, "inconsistent qgroup config");
380 flags |= BTRFS_QGROUP_STATUS_FLAG_INCONSISTENT;
381 }
382 if (!qgroup) {
383 qgroup = add_qgroup_rb(fs_info, found_key.offset);
384 if (IS_ERR(qgroup)) {
385 ret = PTR_ERR(qgroup);
386 goto out;
387 }
388 }
389 switch (found_key.type) {
390 case BTRFS_QGROUP_INFO_KEY: {
391 struct btrfs_qgroup_info_item *ptr;
392
393 ptr = btrfs_item_ptr(l, slot,
394 struct btrfs_qgroup_info_item);
395 qgroup->rfer = btrfs_qgroup_info_rfer(l, ptr);
396 qgroup->rfer_cmpr = btrfs_qgroup_info_rfer_cmpr(l, ptr);
397 qgroup->excl = btrfs_qgroup_info_excl(l, ptr);
398 qgroup->excl_cmpr = btrfs_qgroup_info_excl_cmpr(l, ptr);
399 /* generation currently unused */
400 break;
401 }
402 case BTRFS_QGROUP_LIMIT_KEY: {
403 struct btrfs_qgroup_limit_item *ptr;
404
405 ptr = btrfs_item_ptr(l, slot,
406 struct btrfs_qgroup_limit_item);
407 qgroup->lim_flags = btrfs_qgroup_limit_flags(l, ptr);
408 qgroup->max_rfer = btrfs_qgroup_limit_max_rfer(l, ptr);
409 qgroup->max_excl = btrfs_qgroup_limit_max_excl(l, ptr);
410 qgroup->rsv_rfer = btrfs_qgroup_limit_rsv_rfer(l, ptr);
411 qgroup->rsv_excl = btrfs_qgroup_limit_rsv_excl(l, ptr);
412 break;
413 }
414 }
415 next1:
416 ret = btrfs_next_item(quota_root, path);
417 if (ret < 0)
418 goto out;
419 if (ret)
420 break;
421 }
422 btrfs_release_path(path);
423
424 /*
425 * pass 2: read all qgroup relations
426 */
427 key.objectid = 0;
428 key.type = BTRFS_QGROUP_RELATION_KEY;
429 key.offset = 0;
430 ret = btrfs_search_slot_for_read(quota_root, &key, path, 1, 0);
431 if (ret)
432 goto out;
433 while (1) {
434 slot = path->slots[0];
435 l = path->nodes[0];
436 btrfs_item_key_to_cpu(l, &found_key, slot);
437
438 if (found_key.type != BTRFS_QGROUP_RELATION_KEY)
439 goto next2;
440
441 if (found_key.objectid > found_key.offset) {
442 /* parent <- member, not needed to build config */
443 /* FIXME should we omit the key completely? */
444 goto next2;
445 }
446
447 ret = add_relation_rb(fs_info, found_key.objectid,
448 found_key.offset);
449 if (ret == -ENOENT) {
450 btrfs_warn(fs_info,
451 "orphan qgroup relation 0x%llx->0x%llx",
452 found_key.objectid, found_key.offset);
453 ret = 0; /* ignore the error */
454 }
455 if (ret)
456 goto out;
457 next2:
458 ret = btrfs_next_item(quota_root, path);
459 if (ret < 0)
460 goto out;
461 if (ret)
462 break;
463 }
464 out:
465 fs_info->qgroup_flags |= flags;
466 if (!(fs_info->qgroup_flags & BTRFS_QGROUP_STATUS_FLAG_ON)) {
467 fs_info->quota_enabled = 0;
468 fs_info->pending_quota_state = 0;
469 } else if (fs_info->qgroup_flags & BTRFS_QGROUP_STATUS_FLAG_RESCAN &&
470 ret >= 0) {
471 ret = qgroup_rescan_init(fs_info, rescan_progress, 0);
472 }
473 btrfs_free_path(path);
474
475 if (ret < 0) {
476 ulist_free(fs_info->qgroup_ulist);
477 fs_info->qgroup_ulist = NULL;
478 fs_info->qgroup_flags &= ~BTRFS_QGROUP_STATUS_FLAG_RESCAN;
479 }
480
481 return ret < 0 ? ret : 0;
482 }
483
484 /*
485 * This is called from close_ctree() or open_ctree() or btrfs_quota_disable(),
486 * first two are in single-threaded paths.And for the third one, we have set
487 * quota_root to be null with qgroup_lock held before, so it is safe to clean
488 * up the in-memory structures without qgroup_lock held.
489 */
490 void btrfs_free_qgroup_config(struct btrfs_fs_info *fs_info)
491 {
492 struct rb_node *n;
493 struct btrfs_qgroup *qgroup;
494
495 while ((n = rb_first(&fs_info->qgroup_tree))) {
496 qgroup = rb_entry(n, struct btrfs_qgroup, node);
497 rb_erase(n, &fs_info->qgroup_tree);
498 __del_qgroup_rb(qgroup);
499 }
500 /*
501 * we call btrfs_free_qgroup_config() when umounting
502 * filesystem and disabling quota, so we set qgroup_ulit
503 * to be null here to avoid double free.
504 */
505 ulist_free(fs_info->qgroup_ulist);
506 fs_info->qgroup_ulist = NULL;
507 }
508
509 static int add_qgroup_relation_item(struct btrfs_trans_handle *trans,
510 struct btrfs_root *quota_root,
511 u64 src, u64 dst)
512 {
513 int ret;
514 struct btrfs_path *path;
515 struct btrfs_key key;
516
517 path = btrfs_alloc_path();
518 if (!path)
519 return -ENOMEM;
520
521 key.objectid = src;
522 key.type = BTRFS_QGROUP_RELATION_KEY;
523 key.offset = dst;
524
525 ret = btrfs_insert_empty_item(trans, quota_root, path, &key, 0);
526
527 btrfs_mark_buffer_dirty(path->nodes[0]);
528
529 btrfs_free_path(path);
530 return ret;
531 }
532
533 static int del_qgroup_relation_item(struct btrfs_trans_handle *trans,
534 struct btrfs_root *quota_root,
535 u64 src, u64 dst)
536 {
537 int ret;
538 struct btrfs_path *path;
539 struct btrfs_key key;
540
541 path = btrfs_alloc_path();
542 if (!path)
543 return -ENOMEM;
544
545 key.objectid = src;
546 key.type = BTRFS_QGROUP_RELATION_KEY;
547 key.offset = dst;
548
549 ret = btrfs_search_slot(trans, quota_root, &key, path, -1, 1);
550 if (ret < 0)
551 goto out;
552
553 if (ret > 0) {
554 ret = -ENOENT;
555 goto out;
556 }
557
558 ret = btrfs_del_item(trans, quota_root, path);
559 out:
560 btrfs_free_path(path);
561 return ret;
562 }
563
564 static int add_qgroup_item(struct btrfs_trans_handle *trans,
565 struct btrfs_root *quota_root, u64 qgroupid)
566 {
567 int ret;
568 struct btrfs_path *path;
569 struct btrfs_qgroup_info_item *qgroup_info;
570 struct btrfs_qgroup_limit_item *qgroup_limit;
571 struct extent_buffer *leaf;
572 struct btrfs_key key;
573
574 if (btrfs_test_is_dummy_root(quota_root))
575 return 0;
576
577 path = btrfs_alloc_path();
578 if (!path)
579 return -ENOMEM;
580
581 key.objectid = 0;
582 key.type = BTRFS_QGROUP_INFO_KEY;
583 key.offset = qgroupid;
584
585 /*
586 * Avoid a transaction abort by catching -EEXIST here. In that
587 * case, we proceed by re-initializing the existing structure
588 * on disk.
589 */
590
591 ret = btrfs_insert_empty_item(trans, quota_root, path, &key,
592 sizeof(*qgroup_info));
593 if (ret && ret != -EEXIST)
594 goto out;
595
596 leaf = path->nodes[0];
597 qgroup_info = btrfs_item_ptr(leaf, path->slots[0],
598 struct btrfs_qgroup_info_item);
599 btrfs_set_qgroup_info_generation(leaf, qgroup_info, trans->transid);
600 btrfs_set_qgroup_info_rfer(leaf, qgroup_info, 0);
601 btrfs_set_qgroup_info_rfer_cmpr(leaf, qgroup_info, 0);
602 btrfs_set_qgroup_info_excl(leaf, qgroup_info, 0);
603 btrfs_set_qgroup_info_excl_cmpr(leaf, qgroup_info, 0);
604
605 btrfs_mark_buffer_dirty(leaf);
606
607 btrfs_release_path(path);
608
609 key.type = BTRFS_QGROUP_LIMIT_KEY;
610 ret = btrfs_insert_empty_item(trans, quota_root, path, &key,
611 sizeof(*qgroup_limit));
612 if (ret && ret != -EEXIST)
613 goto out;
614
615 leaf = path->nodes[0];
616 qgroup_limit = btrfs_item_ptr(leaf, path->slots[0],
617 struct btrfs_qgroup_limit_item);
618 btrfs_set_qgroup_limit_flags(leaf, qgroup_limit, 0);
619 btrfs_set_qgroup_limit_max_rfer(leaf, qgroup_limit, 0);
620 btrfs_set_qgroup_limit_max_excl(leaf, qgroup_limit, 0);
621 btrfs_set_qgroup_limit_rsv_rfer(leaf, qgroup_limit, 0);
622 btrfs_set_qgroup_limit_rsv_excl(leaf, qgroup_limit, 0);
623
624 btrfs_mark_buffer_dirty(leaf);
625
626 ret = 0;
627 out:
628 btrfs_free_path(path);
629 return ret;
630 }
631
632 static int del_qgroup_item(struct btrfs_trans_handle *trans,
633 struct btrfs_root *quota_root, u64 qgroupid)
634 {
635 int ret;
636 struct btrfs_path *path;
637 struct btrfs_key key;
638
639 path = btrfs_alloc_path();
640 if (!path)
641 return -ENOMEM;
642
643 key.objectid = 0;
644 key.type = BTRFS_QGROUP_INFO_KEY;
645 key.offset = qgroupid;
646 ret = btrfs_search_slot(trans, quota_root, &key, path, -1, 1);
647 if (ret < 0)
648 goto out;
649
650 if (ret > 0) {
651 ret = -ENOENT;
652 goto out;
653 }
654
655 ret = btrfs_del_item(trans, quota_root, path);
656 if (ret)
657 goto out;
658
659 btrfs_release_path(path);
660
661 key.type = BTRFS_QGROUP_LIMIT_KEY;
662 ret = btrfs_search_slot(trans, quota_root, &key, path, -1, 1);
663 if (ret < 0)
664 goto out;
665
666 if (ret > 0) {
667 ret = -ENOENT;
668 goto out;
669 }
670
671 ret = btrfs_del_item(trans, quota_root, path);
672
673 out:
674 btrfs_free_path(path);
675 return ret;
676 }
677
678 static int update_qgroup_limit_item(struct btrfs_trans_handle *trans,
679 struct btrfs_root *root,
680 struct btrfs_qgroup *qgroup)
681 {
682 struct btrfs_path *path;
683 struct btrfs_key key;
684 struct extent_buffer *l;
685 struct btrfs_qgroup_limit_item *qgroup_limit;
686 int ret;
687 int slot;
688
689 key.objectid = 0;
690 key.type = BTRFS_QGROUP_LIMIT_KEY;
691 key.offset = qgroup->qgroupid;
692
693 path = btrfs_alloc_path();
694 if (!path)
695 return -ENOMEM;
696
697 ret = btrfs_search_slot(trans, root, &key, path, 0, 1);
698 if (ret > 0)
699 ret = -ENOENT;
700
701 if (ret)
702 goto out;
703
704 l = path->nodes[0];
705 slot = path->slots[0];
706 qgroup_limit = btrfs_item_ptr(l, slot, struct btrfs_qgroup_limit_item);
707 btrfs_set_qgroup_limit_flags(l, qgroup_limit, qgroup->lim_flags);
708 btrfs_set_qgroup_limit_max_rfer(l, qgroup_limit, qgroup->max_rfer);
709 btrfs_set_qgroup_limit_max_excl(l, qgroup_limit, qgroup->max_excl);
710 btrfs_set_qgroup_limit_rsv_rfer(l, qgroup_limit, qgroup->rsv_rfer);
711 btrfs_set_qgroup_limit_rsv_excl(l, qgroup_limit, qgroup->rsv_excl);
712
713 btrfs_mark_buffer_dirty(l);
714
715 out:
716 btrfs_free_path(path);
717 return ret;
718 }
719
720 static int update_qgroup_info_item(struct btrfs_trans_handle *trans,
721 struct btrfs_root *root,
722 struct btrfs_qgroup *qgroup)
723 {
724 struct btrfs_path *path;
725 struct btrfs_key key;
726 struct extent_buffer *l;
727 struct btrfs_qgroup_info_item *qgroup_info;
728 int ret;
729 int slot;
730
731 if (btrfs_test_is_dummy_root(root))
732 return 0;
733
734 key.objectid = 0;
735 key.type = BTRFS_QGROUP_INFO_KEY;
736 key.offset = qgroup->qgroupid;
737
738 path = btrfs_alloc_path();
739 if (!path)
740 return -ENOMEM;
741
742 ret = btrfs_search_slot(trans, root, &key, path, 0, 1);
743 if (ret > 0)
744 ret = -ENOENT;
745
746 if (ret)
747 goto out;
748
749 l = path->nodes[0];
750 slot = path->slots[0];
751 qgroup_info = btrfs_item_ptr(l, slot, struct btrfs_qgroup_info_item);
752 btrfs_set_qgroup_info_generation(l, qgroup_info, trans->transid);
753 btrfs_set_qgroup_info_rfer(l, qgroup_info, qgroup->rfer);
754 btrfs_set_qgroup_info_rfer_cmpr(l, qgroup_info, qgroup->rfer_cmpr);
755 btrfs_set_qgroup_info_excl(l, qgroup_info, qgroup->excl);
756 btrfs_set_qgroup_info_excl_cmpr(l, qgroup_info, qgroup->excl_cmpr);
757
758 btrfs_mark_buffer_dirty(l);
759
760 out:
761 btrfs_free_path(path);
762 return ret;
763 }
764
765 static int update_qgroup_status_item(struct btrfs_trans_handle *trans,
766 struct btrfs_fs_info *fs_info,
767 struct btrfs_root *root)
768 {
769 struct btrfs_path *path;
770 struct btrfs_key key;
771 struct extent_buffer *l;
772 struct btrfs_qgroup_status_item *ptr;
773 int ret;
774 int slot;
775
776 key.objectid = 0;
777 key.type = BTRFS_QGROUP_STATUS_KEY;
778 key.offset = 0;
779
780 path = btrfs_alloc_path();
781 if (!path)
782 return -ENOMEM;
783
784 ret = btrfs_search_slot(trans, root, &key, path, 0, 1);
785 if (ret > 0)
786 ret = -ENOENT;
787
788 if (ret)
789 goto out;
790
791 l = path->nodes[0];
792 slot = path->slots[0];
793 ptr = btrfs_item_ptr(l, slot, struct btrfs_qgroup_status_item);
794 btrfs_set_qgroup_status_flags(l, ptr, fs_info->qgroup_flags);
795 btrfs_set_qgroup_status_generation(l, ptr, trans->transid);
796 btrfs_set_qgroup_status_rescan(l, ptr,
797 fs_info->qgroup_rescan_progress.objectid);
798
799 btrfs_mark_buffer_dirty(l);
800
801 out:
802 btrfs_free_path(path);
803 return ret;
804 }
805
806 /*
807 * called with qgroup_lock held
808 */
809 static int btrfs_clean_quota_tree(struct btrfs_trans_handle *trans,
810 struct btrfs_root *root)
811 {
812 struct btrfs_path *path;
813 struct btrfs_key key;
814 struct extent_buffer *leaf = NULL;
815 int ret;
816 int nr = 0;
817
818 path = btrfs_alloc_path();
819 if (!path)
820 return -ENOMEM;
821
822 path->leave_spinning = 1;
823
824 key.objectid = 0;
825 key.offset = 0;
826 key.type = 0;
827
828 while (1) {
829 ret = btrfs_search_slot(trans, root, &key, path, -1, 1);
830 if (ret < 0)
831 goto out;
832 leaf = path->nodes[0];
833 nr = btrfs_header_nritems(leaf);
834 if (!nr)
835 break;
836 /*
837 * delete the leaf one by one
838 * since the whole tree is going
839 * to be deleted.
840 */
841 path->slots[0] = 0;
842 ret = btrfs_del_items(trans, root, path, 0, nr);
843 if (ret)
844 goto out;
845
846 btrfs_release_path(path);
847 }
848 ret = 0;
849 out:
850 root->fs_info->pending_quota_state = 0;
851 btrfs_free_path(path);
852 return ret;
853 }
854
855 int btrfs_quota_enable(struct btrfs_trans_handle *trans,
856 struct btrfs_fs_info *fs_info)
857 {
858 struct btrfs_root *quota_root;
859 struct btrfs_root *tree_root = fs_info->tree_root;
860 struct btrfs_path *path = NULL;
861 struct btrfs_qgroup_status_item *ptr;
862 struct extent_buffer *leaf;
863 struct btrfs_key key;
864 struct btrfs_key found_key;
865 struct btrfs_qgroup *qgroup = NULL;
866 int ret = 0;
867 int slot;
868
869 mutex_lock(&fs_info->qgroup_ioctl_lock);
870 if (fs_info->quota_root) {
871 fs_info->pending_quota_state = 1;
872 goto out;
873 }
874
875 fs_info->qgroup_ulist = ulist_alloc(GFP_NOFS);
876 if (!fs_info->qgroup_ulist) {
877 ret = -ENOMEM;
878 goto out;
879 }
880
881 /*
882 * initially create the quota tree
883 */
884 quota_root = btrfs_create_tree(trans, fs_info,
885 BTRFS_QUOTA_TREE_OBJECTID);
886 if (IS_ERR(quota_root)) {
887 ret = PTR_ERR(quota_root);
888 goto out;
889 }
890
891 path = btrfs_alloc_path();
892 if (!path) {
893 ret = -ENOMEM;
894 goto out_free_root;
895 }
896
897 key.objectid = 0;
898 key.type = BTRFS_QGROUP_STATUS_KEY;
899 key.offset = 0;
900
901 ret = btrfs_insert_empty_item(trans, quota_root, path, &key,
902 sizeof(*ptr));
903 if (ret)
904 goto out_free_path;
905
906 leaf = path->nodes[0];
907 ptr = btrfs_item_ptr(leaf, path->slots[0],
908 struct btrfs_qgroup_status_item);
909 btrfs_set_qgroup_status_generation(leaf, ptr, trans->transid);
910 btrfs_set_qgroup_status_version(leaf, ptr, BTRFS_QGROUP_STATUS_VERSION);
911 fs_info->qgroup_flags = BTRFS_QGROUP_STATUS_FLAG_ON |
912 BTRFS_QGROUP_STATUS_FLAG_INCONSISTENT;
913 btrfs_set_qgroup_status_flags(leaf, ptr, fs_info->qgroup_flags);
914 btrfs_set_qgroup_status_rescan(leaf, ptr, 0);
915
916 btrfs_mark_buffer_dirty(leaf);
917
918 key.objectid = 0;
919 key.type = BTRFS_ROOT_REF_KEY;
920 key.offset = 0;
921
922 btrfs_release_path(path);
923 ret = btrfs_search_slot_for_read(tree_root, &key, path, 1, 0);
924 if (ret > 0)
925 goto out_add_root;
926 if (ret < 0)
927 goto out_free_path;
928
929
930 while (1) {
931 slot = path->slots[0];
932 leaf = path->nodes[0];
933 btrfs_item_key_to_cpu(leaf, &found_key, slot);
934
935 if (found_key.type == BTRFS_ROOT_REF_KEY) {
936 ret = add_qgroup_item(trans, quota_root,
937 found_key.offset);
938 if (ret)
939 goto out_free_path;
940
941 qgroup = add_qgroup_rb(fs_info, found_key.offset);
942 if (IS_ERR(qgroup)) {
943 ret = PTR_ERR(qgroup);
944 goto out_free_path;
945 }
946 }
947 ret = btrfs_next_item(tree_root, path);
948 if (ret < 0)
949 goto out_free_path;
950 if (ret)
951 break;
952 }
953
954 out_add_root:
955 btrfs_release_path(path);
956 ret = add_qgroup_item(trans, quota_root, BTRFS_FS_TREE_OBJECTID);
957 if (ret)
958 goto out_free_path;
959
960 qgroup = add_qgroup_rb(fs_info, BTRFS_FS_TREE_OBJECTID);
961 if (IS_ERR(qgroup)) {
962 ret = PTR_ERR(qgroup);
963 goto out_free_path;
964 }
965 spin_lock(&fs_info->qgroup_lock);
966 fs_info->quota_root = quota_root;
967 fs_info->pending_quota_state = 1;
968 spin_unlock(&fs_info->qgroup_lock);
969 out_free_path:
970 btrfs_free_path(path);
971 out_free_root:
972 if (ret) {
973 free_extent_buffer(quota_root->node);
974 free_extent_buffer(quota_root->commit_root);
975 kfree(quota_root);
976 }
977 out:
978 if (ret) {
979 ulist_free(fs_info->qgroup_ulist);
980 fs_info->qgroup_ulist = NULL;
981 }
982 mutex_unlock(&fs_info->qgroup_ioctl_lock);
983 return ret;
984 }
985
986 int btrfs_quota_disable(struct btrfs_trans_handle *trans,
987 struct btrfs_fs_info *fs_info)
988 {
989 struct btrfs_root *tree_root = fs_info->tree_root;
990 struct btrfs_root *quota_root;
991 int ret = 0;
992
993 mutex_lock(&fs_info->qgroup_ioctl_lock);
994 if (!fs_info->quota_root)
995 goto out;
996 fs_info->quota_enabled = 0;
997 fs_info->pending_quota_state = 0;
998 btrfs_qgroup_wait_for_completion(fs_info);
999 spin_lock(&fs_info->qgroup_lock);
1000 quota_root = fs_info->quota_root;
1001 fs_info->quota_root = NULL;
1002 fs_info->qgroup_flags &= ~BTRFS_QGROUP_STATUS_FLAG_ON;
1003 spin_unlock(&fs_info->qgroup_lock);
1004
1005 btrfs_free_qgroup_config(fs_info);
1006
1007 ret = btrfs_clean_quota_tree(trans, quota_root);
1008 if (ret)
1009 goto out;
1010
1011 ret = btrfs_del_root(trans, tree_root, &quota_root->root_key);
1012 if (ret)
1013 goto out;
1014
1015 list_del(&quota_root->dirty_list);
1016
1017 btrfs_tree_lock(quota_root->node);
1018 clean_tree_block(trans, tree_root->fs_info, quota_root->node);
1019 btrfs_tree_unlock(quota_root->node);
1020 btrfs_free_tree_block(trans, quota_root, quota_root->node, 0, 1);
1021
1022 free_extent_buffer(quota_root->node);
1023 free_extent_buffer(quota_root->commit_root);
1024 kfree(quota_root);
1025 out:
1026 mutex_unlock(&fs_info->qgroup_ioctl_lock);
1027 return ret;
1028 }
1029
1030 static void qgroup_dirty(struct btrfs_fs_info *fs_info,
1031 struct btrfs_qgroup *qgroup)
1032 {
1033 if (list_empty(&qgroup->dirty))
1034 list_add(&qgroup->dirty, &fs_info->dirty_qgroups);
1035 }
1036
1037 /*
1038 * The easy accounting, if we are adding/removing the only ref for an extent
1039 * then this qgroup and all of the parent qgroups get their refrence and
1040 * exclusive counts adjusted.
1041 *
1042 * Caller should hold fs_info->qgroup_lock.
1043 */
1044 static int __qgroup_excl_accounting(struct btrfs_fs_info *fs_info,
1045 struct ulist *tmp, u64 ref_root,
1046 u64 num_bytes, int sign)
1047 {
1048 struct btrfs_qgroup *qgroup;
1049 struct btrfs_qgroup_list *glist;
1050 struct ulist_node *unode;
1051 struct ulist_iterator uiter;
1052 int ret = 0;
1053
1054 qgroup = find_qgroup_rb(fs_info, ref_root);
1055 if (!qgroup)
1056 goto out;
1057
1058 qgroup->rfer += sign * num_bytes;
1059 qgroup->rfer_cmpr += sign * num_bytes;
1060
1061 WARN_ON(sign < 0 && qgroup->excl < num_bytes);
1062 qgroup->excl += sign * num_bytes;
1063 qgroup->excl_cmpr += sign * num_bytes;
1064 if (sign > 0)
1065 qgroup->reserved -= num_bytes;
1066
1067 qgroup_dirty(fs_info, qgroup);
1068
1069 /* Get all of the parent groups that contain this qgroup */
1070 list_for_each_entry(glist, &qgroup->groups, next_group) {
1071 ret = ulist_add(tmp, glist->group->qgroupid,
1072 ptr_to_u64(glist->group), GFP_ATOMIC);
1073 if (ret < 0)
1074 goto out;
1075 }
1076
1077 /* Iterate all of the parents and adjust their reference counts */
1078 ULIST_ITER_INIT(&uiter);
1079 while ((unode = ulist_next(tmp, &uiter))) {
1080 qgroup = u64_to_ptr(unode->aux);
1081 qgroup->rfer += sign * num_bytes;
1082 qgroup->rfer_cmpr += sign * num_bytes;
1083 WARN_ON(sign < 0 && qgroup->excl < num_bytes);
1084 qgroup->excl += sign * num_bytes;
1085 if (sign > 0)
1086 qgroup->reserved -= num_bytes;
1087 qgroup->excl_cmpr += sign * num_bytes;
1088 qgroup_dirty(fs_info, qgroup);
1089
1090 /* Add any parents of the parents */
1091 list_for_each_entry(glist, &qgroup->groups, next_group) {
1092 ret = ulist_add(tmp, glist->group->qgroupid,
1093 ptr_to_u64(glist->group), GFP_ATOMIC);
1094 if (ret < 0)
1095 goto out;
1096 }
1097 }
1098 ret = 0;
1099 out:
1100 return ret;
1101 }
1102
1103
1104 /*
1105 * Quick path for updating qgroup with only excl refs.
1106 *
1107 * In that case, just update all parent will be enough.
1108 * Or we needs to do a full rescan.
1109 * Caller should also hold fs_info->qgroup_lock.
1110 *
1111 * Return 0 for quick update, return >0 for need to full rescan
1112 * and mark INCONSISTENT flag.
1113 * Return < 0 for other error.
1114 */
1115 static int quick_update_accounting(struct btrfs_fs_info *fs_info,
1116 struct ulist *tmp, u64 src, u64 dst,
1117 int sign)
1118 {
1119 struct btrfs_qgroup *qgroup;
1120 int ret = 1;
1121 int err = 0;
1122
1123 qgroup = find_qgroup_rb(fs_info, src);
1124 if (!qgroup)
1125 goto out;
1126 if (qgroup->excl == qgroup->rfer) {
1127 ret = 0;
1128 err = __qgroup_excl_accounting(fs_info, tmp, dst,
1129 qgroup->excl, sign);
1130 if (err < 0) {
1131 ret = err;
1132 goto out;
1133 }
1134 }
1135 out:
1136 if (ret)
1137 fs_info->qgroup_flags |= BTRFS_QGROUP_STATUS_FLAG_INCONSISTENT;
1138 return ret;
1139 }
1140
1141 int btrfs_add_qgroup_relation(struct btrfs_trans_handle *trans,
1142 struct btrfs_fs_info *fs_info, u64 src, u64 dst)
1143 {
1144 struct btrfs_root *quota_root;
1145 struct btrfs_qgroup *parent;
1146 struct btrfs_qgroup *member;
1147 struct btrfs_qgroup_list *list;
1148 struct ulist *tmp;
1149 int ret = 0;
1150
1151 /* Check the level of src and dst first */
1152 if (btrfs_qgroup_level(src) >= btrfs_qgroup_level(dst))
1153 return -EINVAL;
1154
1155 tmp = ulist_alloc(GFP_NOFS);
1156 if (!tmp)
1157 return -ENOMEM;
1158
1159 mutex_lock(&fs_info->qgroup_ioctl_lock);
1160 quota_root = fs_info->quota_root;
1161 if (!quota_root) {
1162 ret = -EINVAL;
1163 goto out;
1164 }
1165 member = find_qgroup_rb(fs_info, src);
1166 parent = find_qgroup_rb(fs_info, dst);
1167 if (!member || !parent) {
1168 ret = -EINVAL;
1169 goto out;
1170 }
1171
1172 /* check if such qgroup relation exist firstly */
1173 list_for_each_entry(list, &member->groups, next_group) {
1174 if (list->group == parent) {
1175 ret = -EEXIST;
1176 goto out;
1177 }
1178 }
1179
1180 ret = add_qgroup_relation_item(trans, quota_root, src, dst);
1181 if (ret)
1182 goto out;
1183
1184 ret = add_qgroup_relation_item(trans, quota_root, dst, src);
1185 if (ret) {
1186 del_qgroup_relation_item(trans, quota_root, src, dst);
1187 goto out;
1188 }
1189
1190 spin_lock(&fs_info->qgroup_lock);
1191 ret = add_relation_rb(quota_root->fs_info, src, dst);
1192 if (ret < 0) {
1193 spin_unlock(&fs_info->qgroup_lock);
1194 goto out;
1195 }
1196 ret = quick_update_accounting(fs_info, tmp, src, dst, 1);
1197 spin_unlock(&fs_info->qgroup_lock);
1198 out:
1199 mutex_unlock(&fs_info->qgroup_ioctl_lock);
1200 ulist_free(tmp);
1201 return ret;
1202 }
1203
1204 int __del_qgroup_relation(struct btrfs_trans_handle *trans,
1205 struct btrfs_fs_info *fs_info, u64 src, u64 dst)
1206 {
1207 struct btrfs_root *quota_root;
1208 struct btrfs_qgroup *parent;
1209 struct btrfs_qgroup *member;
1210 struct btrfs_qgroup_list *list;
1211 struct ulist *tmp;
1212 int ret = 0;
1213 int err;
1214
1215 tmp = ulist_alloc(GFP_NOFS);
1216 if (!tmp)
1217 return -ENOMEM;
1218
1219 quota_root = fs_info->quota_root;
1220 if (!quota_root) {
1221 ret = -EINVAL;
1222 goto out;
1223 }
1224
1225 member = find_qgroup_rb(fs_info, src);
1226 parent = find_qgroup_rb(fs_info, dst);
1227 if (!member || !parent) {
1228 ret = -EINVAL;
1229 goto out;
1230 }
1231
1232 /* check if such qgroup relation exist firstly */
1233 list_for_each_entry(list, &member->groups, next_group) {
1234 if (list->group == parent)
1235 goto exist;
1236 }
1237 ret = -ENOENT;
1238 goto out;
1239 exist:
1240 ret = del_qgroup_relation_item(trans, quota_root, src, dst);
1241 err = del_qgroup_relation_item(trans, quota_root, dst, src);
1242 if (err && !ret)
1243 ret = err;
1244
1245 spin_lock(&fs_info->qgroup_lock);
1246 del_relation_rb(fs_info, src, dst);
1247 ret = quick_update_accounting(fs_info, tmp, src, dst, -1);
1248 spin_unlock(&fs_info->qgroup_lock);
1249 out:
1250 ulist_free(tmp);
1251 return ret;
1252 }
1253
1254 int btrfs_del_qgroup_relation(struct btrfs_trans_handle *trans,
1255 struct btrfs_fs_info *fs_info, u64 src, u64 dst)
1256 {
1257 int ret = 0;
1258
1259 mutex_lock(&fs_info->qgroup_ioctl_lock);
1260 ret = __del_qgroup_relation(trans, fs_info, src, dst);
1261 mutex_unlock(&fs_info->qgroup_ioctl_lock);
1262
1263 return ret;
1264 }
1265
1266 int btrfs_create_qgroup(struct btrfs_trans_handle *trans,
1267 struct btrfs_fs_info *fs_info, u64 qgroupid)
1268 {
1269 struct btrfs_root *quota_root;
1270 struct btrfs_qgroup *qgroup;
1271 int ret = 0;
1272
1273 mutex_lock(&fs_info->qgroup_ioctl_lock);
1274 quota_root = fs_info->quota_root;
1275 if (!quota_root) {
1276 ret = -EINVAL;
1277 goto out;
1278 }
1279 qgroup = find_qgroup_rb(fs_info, qgroupid);
1280 if (qgroup) {
1281 ret = -EEXIST;
1282 goto out;
1283 }
1284
1285 ret = add_qgroup_item(trans, quota_root, qgroupid);
1286 if (ret)
1287 goto out;
1288
1289 spin_lock(&fs_info->qgroup_lock);
1290 qgroup = add_qgroup_rb(fs_info, qgroupid);
1291 spin_unlock(&fs_info->qgroup_lock);
1292
1293 if (IS_ERR(qgroup))
1294 ret = PTR_ERR(qgroup);
1295 out:
1296 mutex_unlock(&fs_info->qgroup_ioctl_lock);
1297 return ret;
1298 }
1299
1300 int btrfs_remove_qgroup(struct btrfs_trans_handle *trans,
1301 struct btrfs_fs_info *fs_info, u64 qgroupid)
1302 {
1303 struct btrfs_root *quota_root;
1304 struct btrfs_qgroup *qgroup;
1305 struct btrfs_qgroup_list *list;
1306 int ret = 0;
1307
1308 mutex_lock(&fs_info->qgroup_ioctl_lock);
1309 quota_root = fs_info->quota_root;
1310 if (!quota_root) {
1311 ret = -EINVAL;
1312 goto out;
1313 }
1314
1315 qgroup = find_qgroup_rb(fs_info, qgroupid);
1316 if (!qgroup) {
1317 ret = -ENOENT;
1318 goto out;
1319 } else {
1320 /* check if there are no children of this qgroup */
1321 if (!list_empty(&qgroup->members)) {
1322 ret = -EBUSY;
1323 goto out;
1324 }
1325 }
1326 ret = del_qgroup_item(trans, quota_root, qgroupid);
1327
1328 while (!list_empty(&qgroup->groups)) {
1329 list = list_first_entry(&qgroup->groups,
1330 struct btrfs_qgroup_list, next_group);
1331 ret = __del_qgroup_relation(trans, fs_info,
1332 qgroupid,
1333 list->group->qgroupid);
1334 if (ret)
1335 goto out;
1336 }
1337
1338 spin_lock(&fs_info->qgroup_lock);
1339 del_qgroup_rb(quota_root->fs_info, qgroupid);
1340 spin_unlock(&fs_info->qgroup_lock);
1341 out:
1342 mutex_unlock(&fs_info->qgroup_ioctl_lock);
1343 return ret;
1344 }
1345
1346 int btrfs_limit_qgroup(struct btrfs_trans_handle *trans,
1347 struct btrfs_fs_info *fs_info, u64 qgroupid,
1348 struct btrfs_qgroup_limit *limit)
1349 {
1350 struct btrfs_root *quota_root;
1351 struct btrfs_qgroup *qgroup;
1352 int ret = 0;
1353 /* Sometimes we would want to clear the limit on this qgroup.
1354 * To meet this requirement, we treat the -1 as a special value
1355 * which tell kernel to clear the limit on this qgroup.
1356 */
1357 const u64 CLEAR_VALUE = -1;
1358
1359 mutex_lock(&fs_info->qgroup_ioctl_lock);
1360 quota_root = fs_info->quota_root;
1361 if (!quota_root) {
1362 ret = -EINVAL;
1363 goto out;
1364 }
1365
1366 qgroup = find_qgroup_rb(fs_info, qgroupid);
1367 if (!qgroup) {
1368 ret = -ENOENT;
1369 goto out;
1370 }
1371
1372 spin_lock(&fs_info->qgroup_lock);
1373 if (limit->flags & BTRFS_QGROUP_LIMIT_MAX_RFER) {
1374 if (limit->max_rfer == CLEAR_VALUE) {
1375 qgroup->lim_flags &= ~BTRFS_QGROUP_LIMIT_MAX_RFER;
1376 limit->flags &= ~BTRFS_QGROUP_LIMIT_MAX_RFER;
1377 qgroup->max_rfer = 0;
1378 } else {
1379 qgroup->max_rfer = limit->max_rfer;
1380 }
1381 }
1382 if (limit->flags & BTRFS_QGROUP_LIMIT_MAX_EXCL) {
1383 if (limit->max_excl == CLEAR_VALUE) {
1384 qgroup->lim_flags &= ~BTRFS_QGROUP_LIMIT_MAX_EXCL;
1385 limit->flags &= ~BTRFS_QGROUP_LIMIT_MAX_EXCL;
1386 qgroup->max_excl = 0;
1387 } else {
1388 qgroup->max_excl = limit->max_excl;
1389 }
1390 }
1391 if (limit->flags & BTRFS_QGROUP_LIMIT_RSV_RFER) {
1392 if (limit->rsv_rfer == CLEAR_VALUE) {
1393 qgroup->lim_flags &= ~BTRFS_QGROUP_LIMIT_RSV_RFER;
1394 limit->flags &= ~BTRFS_QGROUP_LIMIT_RSV_RFER;
1395 qgroup->rsv_rfer = 0;
1396 } else {
1397 qgroup->rsv_rfer = limit->rsv_rfer;
1398 }
1399 }
1400 if (limit->flags & BTRFS_QGROUP_LIMIT_RSV_EXCL) {
1401 if (limit->rsv_excl == CLEAR_VALUE) {
1402 qgroup->lim_flags &= ~BTRFS_QGROUP_LIMIT_RSV_EXCL;
1403 limit->flags &= ~BTRFS_QGROUP_LIMIT_RSV_EXCL;
1404 qgroup->rsv_excl = 0;
1405 } else {
1406 qgroup->rsv_excl = limit->rsv_excl;
1407 }
1408 }
1409 qgroup->lim_flags |= limit->flags;
1410
1411 spin_unlock(&fs_info->qgroup_lock);
1412
1413 ret = update_qgroup_limit_item(trans, quota_root, qgroup);
1414 if (ret) {
1415 fs_info->qgroup_flags |= BTRFS_QGROUP_STATUS_FLAG_INCONSISTENT;
1416 btrfs_info(fs_info, "unable to update quota limit for %llu",
1417 qgroupid);
1418 }
1419
1420 out:
1421 mutex_unlock(&fs_info->qgroup_ioctl_lock);
1422 return ret;
1423 }
1424
1425 int btrfs_qgroup_prepare_account_extents(struct btrfs_trans_handle *trans,
1426 struct btrfs_fs_info *fs_info)
1427 {
1428 struct btrfs_qgroup_extent_record *record;
1429 struct btrfs_delayed_ref_root *delayed_refs;
1430 struct rb_node *node;
1431 u64 qgroup_to_skip;
1432 int ret = 0;
1433
1434 delayed_refs = &trans->transaction->delayed_refs;
1435 qgroup_to_skip = delayed_refs->qgroup_to_skip;
1436
1437 /*
1438 * No need to do lock, since this function will only be called in
1439 * btrfs_commmit_transaction().
1440 */
1441 node = rb_first(&delayed_refs->dirty_extent_root);
1442 while (node) {
1443 record = rb_entry(node, struct btrfs_qgroup_extent_record,
1444 node);
1445 ret = btrfs_find_all_roots(NULL, fs_info, record->bytenr, 0,
1446 &record->old_roots);
1447 if (ret < 0)
1448 break;
1449 if (qgroup_to_skip)
1450 ulist_del(record->old_roots, qgroup_to_skip, 0);
1451 node = rb_next(node);
1452 }
1453 return ret;
1454 }
1455
1456 struct btrfs_qgroup_extent_record
1457 *btrfs_qgroup_insert_dirty_extent(struct btrfs_delayed_ref_root *delayed_refs,
1458 struct btrfs_qgroup_extent_record *record)
1459 {
1460 struct rb_node **p = &delayed_refs->dirty_extent_root.rb_node;
1461 struct rb_node *parent_node = NULL;
1462 struct btrfs_qgroup_extent_record *entry;
1463 u64 bytenr = record->bytenr;
1464
1465 assert_spin_locked(&delayed_refs->lock);
1466 trace_btrfs_qgroup_insert_dirty_extent(record);
1467
1468 while (*p) {
1469 parent_node = *p;
1470 entry = rb_entry(parent_node, struct btrfs_qgroup_extent_record,
1471 node);
1472 if (bytenr < entry->bytenr)
1473 p = &(*p)->rb_left;
1474 else if (bytenr > entry->bytenr)
1475 p = &(*p)->rb_right;
1476 else
1477 return entry;
1478 }
1479
1480 rb_link_node(&record->node, parent_node, p);
1481 rb_insert_color(&record->node, &delayed_refs->dirty_extent_root);
1482 return NULL;
1483 }
1484
1485 #define UPDATE_NEW 0
1486 #define UPDATE_OLD 1
1487 /*
1488 * Walk all of the roots that points to the bytenr and adjust their refcnts.
1489 */
1490 static int qgroup_update_refcnt(struct btrfs_fs_info *fs_info,
1491 struct ulist *roots, struct ulist *tmp,
1492 struct ulist *qgroups, u64 seq, int update_old)
1493 {
1494 struct ulist_node *unode;
1495 struct ulist_iterator uiter;
1496 struct ulist_node *tmp_unode;
1497 struct ulist_iterator tmp_uiter;
1498 struct btrfs_qgroup *qg;
1499 int ret = 0;
1500
1501 if (!roots)
1502 return 0;
1503 ULIST_ITER_INIT(&uiter);
1504 while ((unode = ulist_next(roots, &uiter))) {
1505 qg = find_qgroup_rb(fs_info, unode->val);
1506 if (!qg)
1507 continue;
1508
1509 ulist_reinit(tmp);
1510 ret = ulist_add(qgroups, qg->qgroupid, ptr_to_u64(qg),
1511 GFP_ATOMIC);
1512 if (ret < 0)
1513 return ret;
1514 ret = ulist_add(tmp, qg->qgroupid, ptr_to_u64(qg), GFP_ATOMIC);
1515 if (ret < 0)
1516 return ret;
1517 ULIST_ITER_INIT(&tmp_uiter);
1518 while ((tmp_unode = ulist_next(tmp, &tmp_uiter))) {
1519 struct btrfs_qgroup_list *glist;
1520
1521 qg = u64_to_ptr(tmp_unode->aux);
1522 if (update_old)
1523 btrfs_qgroup_update_old_refcnt(qg, seq, 1);
1524 else
1525 btrfs_qgroup_update_new_refcnt(qg, seq, 1);
1526 list_for_each_entry(glist, &qg->groups, next_group) {
1527 ret = ulist_add(qgroups, glist->group->qgroupid,
1528 ptr_to_u64(glist->group),
1529 GFP_ATOMIC);
1530 if (ret < 0)
1531 return ret;
1532 ret = ulist_add(tmp, glist->group->qgroupid,
1533 ptr_to_u64(glist->group),
1534 GFP_ATOMIC);
1535 if (ret < 0)
1536 return ret;
1537 }
1538 }
1539 }
1540 return 0;
1541 }
1542
1543 /*
1544 * Update qgroup rfer/excl counters.
1545 * Rfer update is easy, codes can explain themselves.
1546 *
1547 * Excl update is tricky, the update is split into 2 part.
1548 * Part 1: Possible exclusive <-> sharing detect:
1549 * | A | !A |
1550 * -------------------------------------
1551 * B | * | - |
1552 * -------------------------------------
1553 * !B | + | ** |
1554 * -------------------------------------
1555 *
1556 * Conditions:
1557 * A: cur_old_roots < nr_old_roots (not exclusive before)
1558 * !A: cur_old_roots == nr_old_roots (possible exclusive before)
1559 * B: cur_new_roots < nr_new_roots (not exclusive now)
1560 * !B: cur_new_roots == nr_new_roots (possible exclsuive now)
1561 *
1562 * Results:
1563 * +: Possible sharing -> exclusive -: Possible exclusive -> sharing
1564 * *: Definitely not changed. **: Possible unchanged.
1565 *
1566 * For !A and !B condition, the exception is cur_old/new_roots == 0 case.
1567 *
1568 * To make the logic clear, we first use condition A and B to split
1569 * combination into 4 results.
1570 *
1571 * Then, for result "+" and "-", check old/new_roots == 0 case, as in them
1572 * only on variant maybe 0.
1573 *
1574 * Lastly, check result **, since there are 2 variants maybe 0, split them
1575 * again(2x2).
1576 * But this time we don't need to consider other things, the codes and logic
1577 * is easy to understand now.
1578 */
1579 static int qgroup_update_counters(struct btrfs_fs_info *fs_info,
1580 struct ulist *qgroups,
1581 u64 nr_old_roots,
1582 u64 nr_new_roots,
1583 u64 num_bytes, u64 seq)
1584 {
1585 struct ulist_node *unode;
1586 struct ulist_iterator uiter;
1587 struct btrfs_qgroup *qg;
1588 u64 cur_new_count, cur_old_count;
1589
1590 ULIST_ITER_INIT(&uiter);
1591 while ((unode = ulist_next(qgroups, &uiter))) {
1592 bool dirty = false;
1593
1594 qg = u64_to_ptr(unode->aux);
1595 cur_old_count = btrfs_qgroup_get_old_refcnt(qg, seq);
1596 cur_new_count = btrfs_qgroup_get_new_refcnt(qg, seq);
1597
1598 trace_qgroup_update_counters(qg->qgroupid, cur_old_count,
1599 cur_new_count);
1600
1601 /* Rfer update part */
1602 if (cur_old_count == 0 && cur_new_count > 0) {
1603 qg->rfer += num_bytes;
1604 qg->rfer_cmpr += num_bytes;
1605 dirty = true;
1606 }
1607 if (cur_old_count > 0 && cur_new_count == 0) {
1608 qg->rfer -= num_bytes;
1609 qg->rfer_cmpr -= num_bytes;
1610 dirty = true;
1611 }
1612
1613 /* Excl update part */
1614 /* Exclusive/none -> shared case */
1615 if (cur_old_count == nr_old_roots &&
1616 cur_new_count < nr_new_roots) {
1617 /* Exclusive -> shared */
1618 if (cur_old_count != 0) {
1619 qg->excl -= num_bytes;
1620 qg->excl_cmpr -= num_bytes;
1621 dirty = true;
1622 }
1623 }
1624
1625 /* Shared -> exclusive/none case */
1626 if (cur_old_count < nr_old_roots &&
1627 cur_new_count == nr_new_roots) {
1628 /* Shared->exclusive */
1629 if (cur_new_count != 0) {
1630 qg->excl += num_bytes;
1631 qg->excl_cmpr += num_bytes;
1632 dirty = true;
1633 }
1634 }
1635
1636 /* Exclusive/none -> exclusive/none case */
1637 if (cur_old_count == nr_old_roots &&
1638 cur_new_count == nr_new_roots) {
1639 if (cur_old_count == 0) {
1640 /* None -> exclusive/none */
1641
1642 if (cur_new_count != 0) {
1643 /* None -> exclusive */
1644 qg->excl += num_bytes;
1645 qg->excl_cmpr += num_bytes;
1646 dirty = true;
1647 }
1648 /* None -> none, nothing changed */
1649 } else {
1650 /* Exclusive -> exclusive/none */
1651
1652 if (cur_new_count == 0) {
1653 /* Exclusive -> none */
1654 qg->excl -= num_bytes;
1655 qg->excl_cmpr -= num_bytes;
1656 dirty = true;
1657 }
1658 /* Exclusive -> exclusive, nothing changed */
1659 }
1660 }
1661
1662 if (dirty)
1663 qgroup_dirty(fs_info, qg);
1664 }
1665 return 0;
1666 }
1667
1668 int
1669 btrfs_qgroup_account_extent(struct btrfs_trans_handle *trans,
1670 struct btrfs_fs_info *fs_info,
1671 u64 bytenr, u64 num_bytes,
1672 struct ulist *old_roots, struct ulist *new_roots)
1673 {
1674 struct ulist *qgroups = NULL;
1675 struct ulist *tmp = NULL;
1676 u64 seq;
1677 u64 nr_new_roots = 0;
1678 u64 nr_old_roots = 0;
1679 int ret = 0;
1680
1681 if (new_roots)
1682 nr_new_roots = new_roots->nnodes;
1683 if (old_roots)
1684 nr_old_roots = old_roots->nnodes;
1685
1686 if (!fs_info->quota_enabled)
1687 goto out_free;
1688 BUG_ON(!fs_info->quota_root);
1689
1690 trace_btrfs_qgroup_account_extent(bytenr, num_bytes, nr_old_roots,
1691 nr_new_roots);
1692
1693 qgroups = ulist_alloc(GFP_NOFS);
1694 if (!qgroups) {
1695 ret = -ENOMEM;
1696 goto out_free;
1697 }
1698 tmp = ulist_alloc(GFP_NOFS);
1699 if (!tmp) {
1700 ret = -ENOMEM;
1701 goto out_free;
1702 }
1703
1704 mutex_lock(&fs_info->qgroup_rescan_lock);
1705 if (fs_info->qgroup_flags & BTRFS_QGROUP_STATUS_FLAG_RESCAN) {
1706 if (fs_info->qgroup_rescan_progress.objectid <= bytenr) {
1707 mutex_unlock(&fs_info->qgroup_rescan_lock);
1708 ret = 0;
1709 goto out_free;
1710 }
1711 }
1712 mutex_unlock(&fs_info->qgroup_rescan_lock);
1713
1714 spin_lock(&fs_info->qgroup_lock);
1715 seq = fs_info->qgroup_seq;
1716
1717 /* Update old refcnts using old_roots */
1718 ret = qgroup_update_refcnt(fs_info, old_roots, tmp, qgroups, seq,
1719 UPDATE_OLD);
1720 if (ret < 0)
1721 goto out;
1722
1723 /* Update new refcnts using new_roots */
1724 ret = qgroup_update_refcnt(fs_info, new_roots, tmp, qgroups, seq,
1725 UPDATE_NEW);
1726 if (ret < 0)
1727 goto out;
1728
1729 qgroup_update_counters(fs_info, qgroups, nr_old_roots, nr_new_roots,
1730 num_bytes, seq);
1731
1732 /*
1733 * Bump qgroup_seq to avoid seq overlap
1734 */
1735 fs_info->qgroup_seq += max(nr_old_roots, nr_new_roots) + 1;
1736 out:
1737 spin_unlock(&fs_info->qgroup_lock);
1738 out_free:
1739 ulist_free(tmp);
1740 ulist_free(qgroups);
1741 ulist_free(old_roots);
1742 ulist_free(new_roots);
1743 return ret;
1744 }
1745
1746 int btrfs_qgroup_account_extents(struct btrfs_trans_handle *trans,
1747 struct btrfs_fs_info *fs_info)
1748 {
1749 struct btrfs_qgroup_extent_record *record;
1750 struct btrfs_delayed_ref_root *delayed_refs;
1751 struct ulist *new_roots = NULL;
1752 struct rb_node *node;
1753 u64 qgroup_to_skip;
1754 int ret = 0;
1755
1756 delayed_refs = &trans->transaction->delayed_refs;
1757 qgroup_to_skip = delayed_refs->qgroup_to_skip;
1758 while ((node = rb_first(&delayed_refs->dirty_extent_root))) {
1759 record = rb_entry(node, struct btrfs_qgroup_extent_record,
1760 node);
1761
1762 trace_btrfs_qgroup_account_extents(record);
1763
1764 if (!ret) {
1765 /*
1766 * Use (u64)-1 as time_seq to do special search, which
1767 * doesn't lock tree or delayed_refs and search current
1768 * root. It's safe inside commit_transaction().
1769 */
1770 ret = btrfs_find_all_roots(trans, fs_info,
1771 record->bytenr, (u64)-1, &new_roots);
1772 if (ret < 0)
1773 goto cleanup;
1774 if (qgroup_to_skip)
1775 ulist_del(new_roots, qgroup_to_skip, 0);
1776 ret = btrfs_qgroup_account_extent(trans, fs_info,
1777 record->bytenr, record->num_bytes,
1778 record->old_roots, new_roots);
1779 record->old_roots = NULL;
1780 new_roots = NULL;
1781 }
1782 cleanup:
1783 ulist_free(record->old_roots);
1784 ulist_free(new_roots);
1785 new_roots = NULL;
1786 rb_erase(node, &delayed_refs->dirty_extent_root);
1787 kfree(record);
1788
1789 }
1790 return ret;
1791 }
1792
1793 /*
1794 * called from commit_transaction. Writes all changed qgroups to disk.
1795 */
1796 int btrfs_run_qgroups(struct btrfs_trans_handle *trans,
1797 struct btrfs_fs_info *fs_info)
1798 {
1799 struct btrfs_root *quota_root = fs_info->quota_root;
1800 int ret = 0;
1801 int start_rescan_worker = 0;
1802
1803 if (!quota_root)
1804 goto out;
1805
1806 if (!fs_info->quota_enabled && fs_info->pending_quota_state)
1807 start_rescan_worker = 1;
1808
1809 fs_info->quota_enabled = fs_info->pending_quota_state;
1810
1811 spin_lock(&fs_info->qgroup_lock);
1812 while (!list_empty(&fs_info->dirty_qgroups)) {
1813 struct btrfs_qgroup *qgroup;
1814 qgroup = list_first_entry(&fs_info->dirty_qgroups,
1815 struct btrfs_qgroup, dirty);
1816 list_del_init(&qgroup->dirty);
1817 spin_unlock(&fs_info->qgroup_lock);
1818 ret = update_qgroup_info_item(trans, quota_root, qgroup);
1819 if (ret)
1820 fs_info->qgroup_flags |=
1821 BTRFS_QGROUP_STATUS_FLAG_INCONSISTENT;
1822 ret = update_qgroup_limit_item(trans, quota_root, qgroup);
1823 if (ret)
1824 fs_info->qgroup_flags |=
1825 BTRFS_QGROUP_STATUS_FLAG_INCONSISTENT;
1826 spin_lock(&fs_info->qgroup_lock);
1827 }
1828 if (fs_info->quota_enabled)
1829 fs_info->qgroup_flags |= BTRFS_QGROUP_STATUS_FLAG_ON;
1830 else
1831 fs_info->qgroup_flags &= ~BTRFS_QGROUP_STATUS_FLAG_ON;
1832 spin_unlock(&fs_info->qgroup_lock);
1833
1834 ret = update_qgroup_status_item(trans, fs_info, quota_root);
1835 if (ret)
1836 fs_info->qgroup_flags |= BTRFS_QGROUP_STATUS_FLAG_INCONSISTENT;
1837
1838 if (!ret && start_rescan_worker) {
1839 ret = qgroup_rescan_init(fs_info, 0, 1);
1840 if (!ret) {
1841 qgroup_rescan_zero_tracking(fs_info);
1842 btrfs_queue_work(fs_info->qgroup_rescan_workers,
1843 &fs_info->qgroup_rescan_work);
1844 }
1845 ret = 0;
1846 }
1847
1848 out:
1849
1850 return ret;
1851 }
1852
1853 /*
1854 * Copy the acounting information between qgroups. This is necessary
1855 * when a snapshot or a subvolume is created. Throwing an error will
1856 * cause a transaction abort so we take extra care here to only error
1857 * when a readonly fs is a reasonable outcome.
1858 */
1859 int btrfs_qgroup_inherit(struct btrfs_trans_handle *trans,
1860 struct btrfs_fs_info *fs_info, u64 srcid, u64 objectid,
1861 struct btrfs_qgroup_inherit *inherit)
1862 {
1863 int ret = 0;
1864 int i;
1865 u64 *i_qgroups;
1866 struct btrfs_root *quota_root = fs_info->quota_root;
1867 struct btrfs_qgroup *srcgroup;
1868 struct btrfs_qgroup *dstgroup;
1869 u32 level_size = 0;
1870 u64 nums;
1871
1872 mutex_lock(&fs_info->qgroup_ioctl_lock);
1873 if (!fs_info->quota_enabled)
1874 goto out;
1875
1876 if (!quota_root) {
1877 ret = -EINVAL;
1878 goto out;
1879 }
1880
1881 if (inherit) {
1882 i_qgroups = (u64 *)(inherit + 1);
1883 nums = inherit->num_qgroups + 2 * inherit->num_ref_copies +
1884 2 * inherit->num_excl_copies;
1885 for (i = 0; i < nums; ++i) {
1886 srcgroup = find_qgroup_rb(fs_info, *i_qgroups);
1887
1888 /*
1889 * Zero out invalid groups so we can ignore
1890 * them later.
1891 */
1892 if (!srcgroup ||
1893 ((srcgroup->qgroupid >> 48) <= (objectid >> 48)))
1894 *i_qgroups = 0ULL;
1895
1896 ++i_qgroups;
1897 }
1898 }
1899
1900 /*
1901 * create a tracking group for the subvol itself
1902 */
1903 ret = add_qgroup_item(trans, quota_root, objectid);
1904 if (ret)
1905 goto out;
1906
1907 if (srcid) {
1908 struct btrfs_root *srcroot;
1909 struct btrfs_key srckey;
1910
1911 srckey.objectid = srcid;
1912 srckey.type = BTRFS_ROOT_ITEM_KEY;
1913 srckey.offset = (u64)-1;
1914 srcroot = btrfs_read_fs_root_no_name(fs_info, &srckey);
1915 if (IS_ERR(srcroot)) {
1916 ret = PTR_ERR(srcroot);
1917 goto out;
1918 }
1919
1920 rcu_read_lock();
1921 level_size = srcroot->nodesize;
1922 rcu_read_unlock();
1923 }
1924
1925 /*
1926 * add qgroup to all inherited groups
1927 */
1928 if (inherit) {
1929 i_qgroups = (u64 *)(inherit + 1);
1930 for (i = 0; i < inherit->num_qgroups; ++i, ++i_qgroups) {
1931 if (*i_qgroups == 0)
1932 continue;
1933 ret = add_qgroup_relation_item(trans, quota_root,
1934 objectid, *i_qgroups);
1935 if (ret && ret != -EEXIST)
1936 goto out;
1937 ret = add_qgroup_relation_item(trans, quota_root,
1938 *i_qgroups, objectid);
1939 if (ret && ret != -EEXIST)
1940 goto out;
1941 }
1942 ret = 0;
1943 }
1944
1945
1946 spin_lock(&fs_info->qgroup_lock);
1947
1948 dstgroup = add_qgroup_rb(fs_info, objectid);
1949 if (IS_ERR(dstgroup)) {
1950 ret = PTR_ERR(dstgroup);
1951 goto unlock;
1952 }
1953
1954 if (inherit && inherit->flags & BTRFS_QGROUP_INHERIT_SET_LIMITS) {
1955 dstgroup->lim_flags = inherit->lim.flags;
1956 dstgroup->max_rfer = inherit->lim.max_rfer;
1957 dstgroup->max_excl = inherit->lim.max_excl;
1958 dstgroup->rsv_rfer = inherit->lim.rsv_rfer;
1959 dstgroup->rsv_excl = inherit->lim.rsv_excl;
1960
1961 ret = update_qgroup_limit_item(trans, quota_root, dstgroup);
1962 if (ret) {
1963 fs_info->qgroup_flags |= BTRFS_QGROUP_STATUS_FLAG_INCONSISTENT;
1964 btrfs_info(fs_info, "unable to update quota limit for %llu",
1965 dstgroup->qgroupid);
1966 goto unlock;
1967 }
1968 }
1969
1970 if (srcid) {
1971 srcgroup = find_qgroup_rb(fs_info, srcid);
1972 if (!srcgroup)
1973 goto unlock;
1974
1975 /*
1976 * We call inherit after we clone the root in order to make sure
1977 * our counts don't go crazy, so at this point the only
1978 * difference between the two roots should be the root node.
1979 */
1980 dstgroup->rfer = srcgroup->rfer;
1981 dstgroup->rfer_cmpr = srcgroup->rfer_cmpr;
1982 dstgroup->excl = level_size;
1983 dstgroup->excl_cmpr = level_size;
1984 srcgroup->excl = level_size;
1985 srcgroup->excl_cmpr = level_size;
1986
1987 /* inherit the limit info */
1988 dstgroup->lim_flags = srcgroup->lim_flags;
1989 dstgroup->max_rfer = srcgroup->max_rfer;
1990 dstgroup->max_excl = srcgroup->max_excl;
1991 dstgroup->rsv_rfer = srcgroup->rsv_rfer;
1992 dstgroup->rsv_excl = srcgroup->rsv_excl;
1993
1994 qgroup_dirty(fs_info, dstgroup);
1995 qgroup_dirty(fs_info, srcgroup);
1996 }
1997
1998 if (!inherit)
1999 goto unlock;
2000
2001 i_qgroups = (u64 *)(inherit + 1);
2002 for (i = 0; i < inherit->num_qgroups; ++i) {
2003 if (*i_qgroups) {
2004 ret = add_relation_rb(quota_root->fs_info, objectid,
2005 *i_qgroups);
2006 if (ret)
2007 goto unlock;
2008 }
2009 ++i_qgroups;
2010 }
2011
2012 for (i = 0; i < inherit->num_ref_copies; ++i, i_qgroups += 2) {
2013 struct btrfs_qgroup *src;
2014 struct btrfs_qgroup *dst;
2015
2016 if (!i_qgroups[0] || !i_qgroups[1])
2017 continue;
2018
2019 src = find_qgroup_rb(fs_info, i_qgroups[0]);
2020 dst = find_qgroup_rb(fs_info, i_qgroups[1]);
2021
2022 if (!src || !dst) {
2023 ret = -EINVAL;
2024 goto unlock;
2025 }
2026
2027 dst->rfer = src->rfer - level_size;
2028 dst->rfer_cmpr = src->rfer_cmpr - level_size;
2029 }
2030 for (i = 0; i < inherit->num_excl_copies; ++i, i_qgroups += 2) {
2031 struct btrfs_qgroup *src;
2032 struct btrfs_qgroup *dst;
2033
2034 if (!i_qgroups[0] || !i_qgroups[1])
2035 continue;
2036
2037 src = find_qgroup_rb(fs_info, i_qgroups[0]);
2038 dst = find_qgroup_rb(fs_info, i_qgroups[1]);
2039
2040 if (!src || !dst) {
2041 ret = -EINVAL;
2042 goto unlock;
2043 }
2044
2045 dst->excl = src->excl + level_size;
2046 dst->excl_cmpr = src->excl_cmpr + level_size;
2047 }
2048
2049 unlock:
2050 spin_unlock(&fs_info->qgroup_lock);
2051 out:
2052 mutex_unlock(&fs_info->qgroup_ioctl_lock);
2053 return ret;
2054 }
2055
2056 static int qgroup_reserve(struct btrfs_root *root, u64 num_bytes)
2057 {
2058 struct btrfs_root *quota_root;
2059 struct btrfs_qgroup *qgroup;
2060 struct btrfs_fs_info *fs_info = root->fs_info;
2061 u64 ref_root = root->root_key.objectid;
2062 int ret = 0;
2063 struct ulist_node *unode;
2064 struct ulist_iterator uiter;
2065
2066 if (!is_fstree(ref_root))
2067 return 0;
2068
2069 if (num_bytes == 0)
2070 return 0;
2071
2072 spin_lock(&fs_info->qgroup_lock);
2073 quota_root = fs_info->quota_root;
2074 if (!quota_root)
2075 goto out;
2076
2077 qgroup = find_qgroup_rb(fs_info, ref_root);
2078 if (!qgroup)
2079 goto out;
2080
2081 /*
2082 * in a first step, we check all affected qgroups if any limits would
2083 * be exceeded
2084 */
2085 ulist_reinit(fs_info->qgroup_ulist);
2086 ret = ulist_add(fs_info->qgroup_ulist, qgroup->qgroupid,
2087 (uintptr_t)qgroup, GFP_ATOMIC);
2088 if (ret < 0)
2089 goto out;
2090 ULIST_ITER_INIT(&uiter);
2091 while ((unode = ulist_next(fs_info->qgroup_ulist, &uiter))) {
2092 struct btrfs_qgroup *qg;
2093 struct btrfs_qgroup_list *glist;
2094
2095 qg = u64_to_ptr(unode->aux);
2096
2097 if ((qg->lim_flags & BTRFS_QGROUP_LIMIT_MAX_RFER) &&
2098 qg->reserved + (s64)qg->rfer + num_bytes >
2099 qg->max_rfer) {
2100 ret = -EDQUOT;
2101 goto out;
2102 }
2103
2104 if ((qg->lim_flags & BTRFS_QGROUP_LIMIT_MAX_EXCL) &&
2105 qg->reserved + (s64)qg->excl + num_bytes >
2106 qg->max_excl) {
2107 ret = -EDQUOT;
2108 goto out;
2109 }
2110
2111 list_for_each_entry(glist, &qg->groups, next_group) {
2112 ret = ulist_add(fs_info->qgroup_ulist,
2113 glist->group->qgroupid,
2114 (uintptr_t)glist->group, GFP_ATOMIC);
2115 if (ret < 0)
2116 goto out;
2117 }
2118 }
2119 ret = 0;
2120 /*
2121 * no limits exceeded, now record the reservation into all qgroups
2122 */
2123 ULIST_ITER_INIT(&uiter);
2124 while ((unode = ulist_next(fs_info->qgroup_ulist, &uiter))) {
2125 struct btrfs_qgroup *qg;
2126
2127 qg = u64_to_ptr(unode->aux);
2128
2129 qg->reserved += num_bytes;
2130 }
2131
2132 out:
2133 spin_unlock(&fs_info->qgroup_lock);
2134 return ret;
2135 }
2136
2137 void btrfs_qgroup_free_refroot(struct btrfs_fs_info *fs_info,
2138 u64 ref_root, u64 num_bytes)
2139 {
2140 struct btrfs_root *quota_root;
2141 struct btrfs_qgroup *qgroup;
2142 struct ulist_node *unode;
2143 struct ulist_iterator uiter;
2144 int ret = 0;
2145
2146 if (!is_fstree(ref_root))
2147 return;
2148
2149 if (num_bytes == 0)
2150 return;
2151
2152 spin_lock(&fs_info->qgroup_lock);
2153
2154 quota_root = fs_info->quota_root;
2155 if (!quota_root)
2156 goto out;
2157
2158 qgroup = find_qgroup_rb(fs_info, ref_root);
2159 if (!qgroup)
2160 goto out;
2161
2162 ulist_reinit(fs_info->qgroup_ulist);
2163 ret = ulist_add(fs_info->qgroup_ulist, qgroup->qgroupid,
2164 (uintptr_t)qgroup, GFP_ATOMIC);
2165 if (ret < 0)
2166 goto out;
2167 ULIST_ITER_INIT(&uiter);
2168 while ((unode = ulist_next(fs_info->qgroup_ulist, &uiter))) {
2169 struct btrfs_qgroup *qg;
2170 struct btrfs_qgroup_list *glist;
2171
2172 qg = u64_to_ptr(unode->aux);
2173
2174 qg->reserved -= num_bytes;
2175
2176 list_for_each_entry(glist, &qg->groups, next_group) {
2177 ret = ulist_add(fs_info->qgroup_ulist,
2178 glist->group->qgroupid,
2179 (uintptr_t)glist->group, GFP_ATOMIC);
2180 if (ret < 0)
2181 goto out;
2182 }
2183 }
2184
2185 out:
2186 spin_unlock(&fs_info->qgroup_lock);
2187 }
2188
2189 static inline void qgroup_free(struct btrfs_root *root, u64 num_bytes)
2190 {
2191 return btrfs_qgroup_free_refroot(root->fs_info, root->objectid,
2192 num_bytes);
2193 }
2194 void assert_qgroups_uptodate(struct btrfs_trans_handle *trans)
2195 {
2196 if (list_empty(&trans->qgroup_ref_list) && !trans->delayed_ref_elem.seq)
2197 return;
2198 btrfs_err(trans->root->fs_info,
2199 "qgroups not uptodate in trans handle %p: list is%s empty, "
2200 "seq is %#x.%x",
2201 trans, list_empty(&trans->qgroup_ref_list) ? "" : " not",
2202 (u32)(trans->delayed_ref_elem.seq >> 32),
2203 (u32)trans->delayed_ref_elem.seq);
2204 BUG();
2205 }
2206
2207 /*
2208 * returns < 0 on error, 0 when more leafs are to be scanned.
2209 * returns 1 when done.
2210 */
2211 static int
2212 qgroup_rescan_leaf(struct btrfs_fs_info *fs_info, struct btrfs_path *path,
2213 struct btrfs_trans_handle *trans)
2214 {
2215 struct btrfs_key found;
2216 struct extent_buffer *scratch_leaf = NULL;
2217 struct ulist *roots = NULL;
2218 struct seq_list tree_mod_seq_elem = SEQ_LIST_INIT(tree_mod_seq_elem);
2219 u64 num_bytes;
2220 int slot;
2221 int ret;
2222
2223 mutex_lock(&fs_info->qgroup_rescan_lock);
2224 ret = btrfs_search_slot_for_read(fs_info->extent_root,
2225 &fs_info->qgroup_rescan_progress,
2226 path, 1, 0);
2227
2228 pr_debug("current progress key (%llu %u %llu), search_slot ret %d\n",
2229 fs_info->qgroup_rescan_progress.objectid,
2230 fs_info->qgroup_rescan_progress.type,
2231 fs_info->qgroup_rescan_progress.offset, ret);
2232
2233 if (ret) {
2234 /*
2235 * The rescan is about to end, we will not be scanning any
2236 * further blocks. We cannot unset the RESCAN flag here, because
2237 * we want to commit the transaction if everything went well.
2238 * To make the live accounting work in this phase, we set our
2239 * scan progress pointer such that every real extent objectid
2240 * will be smaller.
2241 */
2242 fs_info->qgroup_rescan_progress.objectid = (u64)-1;
2243 btrfs_release_path(path);
2244 mutex_unlock(&fs_info->qgroup_rescan_lock);
2245 return ret;
2246 }
2247
2248 btrfs_item_key_to_cpu(path->nodes[0], &found,
2249 btrfs_header_nritems(path->nodes[0]) - 1);
2250 fs_info->qgroup_rescan_progress.objectid = found.objectid + 1;
2251
2252 btrfs_get_tree_mod_seq(fs_info, &tree_mod_seq_elem);
2253 scratch_leaf = btrfs_clone_extent_buffer(path->nodes[0]);
2254 if (!scratch_leaf) {
2255 ret = -ENOMEM;
2256 mutex_unlock(&fs_info->qgroup_rescan_lock);
2257 goto out;
2258 }
2259 extent_buffer_get(scratch_leaf);
2260 btrfs_tree_read_lock(scratch_leaf);
2261 btrfs_set_lock_blocking_rw(scratch_leaf, BTRFS_READ_LOCK);
2262 slot = path->slots[0];
2263 btrfs_release_path(path);
2264 mutex_unlock(&fs_info->qgroup_rescan_lock);
2265
2266 for (; slot < btrfs_header_nritems(scratch_leaf); ++slot) {
2267 btrfs_item_key_to_cpu(scratch_leaf, &found, slot);
2268 if (found.type != BTRFS_EXTENT_ITEM_KEY &&
2269 found.type != BTRFS_METADATA_ITEM_KEY)
2270 continue;
2271 if (found.type == BTRFS_METADATA_ITEM_KEY)
2272 num_bytes = fs_info->extent_root->nodesize;
2273 else
2274 num_bytes = found.offset;
2275
2276 ret = btrfs_find_all_roots(NULL, fs_info, found.objectid, 0,
2277 &roots);
2278 if (ret < 0)
2279 goto out;
2280 /* For rescan, just pass old_roots as NULL */
2281 ret = btrfs_qgroup_account_extent(trans, fs_info,
2282 found.objectid, num_bytes, NULL, roots);
2283 if (ret < 0)
2284 goto out;
2285 }
2286 out:
2287 if (scratch_leaf) {
2288 btrfs_tree_read_unlock_blocking(scratch_leaf);
2289 free_extent_buffer(scratch_leaf);
2290 }
2291 btrfs_put_tree_mod_seq(fs_info, &tree_mod_seq_elem);
2292
2293 return ret;
2294 }
2295
2296 static void btrfs_qgroup_rescan_worker(struct btrfs_work *work)
2297 {
2298 struct btrfs_fs_info *fs_info = container_of(work, struct btrfs_fs_info,
2299 qgroup_rescan_work);
2300 struct btrfs_path *path;
2301 struct btrfs_trans_handle *trans = NULL;
2302 int err = -ENOMEM;
2303 int ret = 0;
2304
2305 path = btrfs_alloc_path();
2306 if (!path)
2307 goto out;
2308
2309 err = 0;
2310 while (!err && !btrfs_fs_closing(fs_info)) {
2311 trans = btrfs_start_transaction(fs_info->fs_root, 0);
2312 if (IS_ERR(trans)) {
2313 err = PTR_ERR(trans);
2314 break;
2315 }
2316 if (!fs_info->quota_enabled) {
2317 err = -EINTR;
2318 } else {
2319 err = qgroup_rescan_leaf(fs_info, path, trans);
2320 }
2321 if (err > 0)
2322 btrfs_commit_transaction(trans, fs_info->fs_root);
2323 else
2324 btrfs_end_transaction(trans, fs_info->fs_root);
2325 }
2326
2327 out:
2328 btrfs_free_path(path);
2329
2330 mutex_lock(&fs_info->qgroup_rescan_lock);
2331 if (!btrfs_fs_closing(fs_info))
2332 fs_info->qgroup_flags &= ~BTRFS_QGROUP_STATUS_FLAG_RESCAN;
2333
2334 if (err > 0 &&
2335 fs_info->qgroup_flags & BTRFS_QGROUP_STATUS_FLAG_INCONSISTENT) {
2336 fs_info->qgroup_flags &= ~BTRFS_QGROUP_STATUS_FLAG_INCONSISTENT;
2337 } else if (err < 0) {
2338 fs_info->qgroup_flags |= BTRFS_QGROUP_STATUS_FLAG_INCONSISTENT;
2339 }
2340 mutex_unlock(&fs_info->qgroup_rescan_lock);
2341
2342 /*
2343 * only update status, since the previous part has alreay updated the
2344 * qgroup info.
2345 */
2346 trans = btrfs_start_transaction(fs_info->quota_root, 1);
2347 if (IS_ERR(trans)) {
2348 err = PTR_ERR(trans);
2349 btrfs_err(fs_info,
2350 "fail to start transaction for status update: %d\n",
2351 err);
2352 goto done;
2353 }
2354 ret = update_qgroup_status_item(trans, fs_info, fs_info->quota_root);
2355 if (ret < 0) {
2356 err = ret;
2357 btrfs_err(fs_info, "fail to update qgroup status: %d\n", err);
2358 }
2359 btrfs_end_transaction(trans, fs_info->quota_root);
2360
2361 if (btrfs_fs_closing(fs_info)) {
2362 btrfs_info(fs_info, "qgroup scan paused");
2363 } else if (err >= 0) {
2364 btrfs_info(fs_info, "qgroup scan completed%s",
2365 err > 0 ? " (inconsistency flag cleared)" : "");
2366 } else {
2367 btrfs_err(fs_info, "qgroup scan failed with %d", err);
2368 }
2369
2370 done:
2371 complete_all(&fs_info->qgroup_rescan_completion);
2372 }
2373
2374 /*
2375 * Checks that (a) no rescan is running and (b) quota is enabled. Allocates all
2376 * memory required for the rescan context.
2377 */
2378 static int
2379 qgroup_rescan_init(struct btrfs_fs_info *fs_info, u64 progress_objectid,
2380 int init_flags)
2381 {
2382 int ret = 0;
2383
2384 if (!init_flags &&
2385 (!(fs_info->qgroup_flags & BTRFS_QGROUP_STATUS_FLAG_RESCAN) ||
2386 !(fs_info->qgroup_flags & BTRFS_QGROUP_STATUS_FLAG_ON))) {
2387 ret = -EINVAL;
2388 goto err;
2389 }
2390
2391 mutex_lock(&fs_info->qgroup_rescan_lock);
2392 spin_lock(&fs_info->qgroup_lock);
2393
2394 if (init_flags) {
2395 if (fs_info->qgroup_flags & BTRFS_QGROUP_STATUS_FLAG_RESCAN)
2396 ret = -EINPROGRESS;
2397 else if (!(fs_info->qgroup_flags & BTRFS_QGROUP_STATUS_FLAG_ON))
2398 ret = -EINVAL;
2399
2400 if (ret) {
2401 spin_unlock(&fs_info->qgroup_lock);
2402 mutex_unlock(&fs_info->qgroup_rescan_lock);
2403 goto err;
2404 }
2405 fs_info->qgroup_flags |= BTRFS_QGROUP_STATUS_FLAG_RESCAN;
2406 }
2407
2408 memset(&fs_info->qgroup_rescan_progress, 0,
2409 sizeof(fs_info->qgroup_rescan_progress));
2410 fs_info->qgroup_rescan_progress.objectid = progress_objectid;
2411 init_completion(&fs_info->qgroup_rescan_completion);
2412
2413 spin_unlock(&fs_info->qgroup_lock);
2414 mutex_unlock(&fs_info->qgroup_rescan_lock);
2415
2416 memset(&fs_info->qgroup_rescan_work, 0,
2417 sizeof(fs_info->qgroup_rescan_work));
2418 btrfs_init_work(&fs_info->qgroup_rescan_work,
2419 btrfs_qgroup_rescan_helper,
2420 btrfs_qgroup_rescan_worker, NULL, NULL);
2421
2422 if (ret) {
2423 err:
2424 btrfs_info(fs_info, "qgroup_rescan_init failed with %d", ret);
2425 return ret;
2426 }
2427
2428 return 0;
2429 }
2430
2431 static void
2432 qgroup_rescan_zero_tracking(struct btrfs_fs_info *fs_info)
2433 {
2434 struct rb_node *n;
2435 struct btrfs_qgroup *qgroup;
2436
2437 spin_lock(&fs_info->qgroup_lock);
2438 /* clear all current qgroup tracking information */
2439 for (n = rb_first(&fs_info->qgroup_tree); n; n = rb_next(n)) {
2440 qgroup = rb_entry(n, struct btrfs_qgroup, node);
2441 qgroup->rfer = 0;
2442 qgroup->rfer_cmpr = 0;
2443 qgroup->excl = 0;
2444 qgroup->excl_cmpr = 0;
2445 }
2446 spin_unlock(&fs_info->qgroup_lock);
2447 }
2448
2449 int
2450 btrfs_qgroup_rescan(struct btrfs_fs_info *fs_info)
2451 {
2452 int ret = 0;
2453 struct btrfs_trans_handle *trans;
2454
2455 ret = qgroup_rescan_init(fs_info, 0, 1);
2456 if (ret)
2457 return ret;
2458
2459 /*
2460 * We have set the rescan_progress to 0, which means no more
2461 * delayed refs will be accounted by btrfs_qgroup_account_ref.
2462 * However, btrfs_qgroup_account_ref may be right after its call
2463 * to btrfs_find_all_roots, in which case it would still do the
2464 * accounting.
2465 * To solve this, we're committing the transaction, which will
2466 * ensure we run all delayed refs and only after that, we are
2467 * going to clear all tracking information for a clean start.
2468 */
2469
2470 trans = btrfs_join_transaction(fs_info->fs_root);
2471 if (IS_ERR(trans)) {
2472 fs_info->qgroup_flags &= ~BTRFS_QGROUP_STATUS_FLAG_RESCAN;
2473 return PTR_ERR(trans);
2474 }
2475 ret = btrfs_commit_transaction(trans, fs_info->fs_root);
2476 if (ret) {
2477 fs_info->qgroup_flags &= ~BTRFS_QGROUP_STATUS_FLAG_RESCAN;
2478 return ret;
2479 }
2480
2481 qgroup_rescan_zero_tracking(fs_info);
2482
2483 btrfs_queue_work(fs_info->qgroup_rescan_workers,
2484 &fs_info->qgroup_rescan_work);
2485
2486 return 0;
2487 }
2488
2489 int btrfs_qgroup_wait_for_completion(struct btrfs_fs_info *fs_info)
2490 {
2491 int running;
2492 int ret = 0;
2493
2494 mutex_lock(&fs_info->qgroup_rescan_lock);
2495 spin_lock(&fs_info->qgroup_lock);
2496 running = fs_info->qgroup_flags & BTRFS_QGROUP_STATUS_FLAG_RESCAN;
2497 spin_unlock(&fs_info->qgroup_lock);
2498 mutex_unlock(&fs_info->qgroup_rescan_lock);
2499
2500 if (running)
2501 ret = wait_for_completion_interruptible(
2502 &fs_info->qgroup_rescan_completion);
2503
2504 return ret;
2505 }
2506
2507 /*
2508 * this is only called from open_ctree where we're still single threaded, thus
2509 * locking is omitted here.
2510 */
2511 void
2512 btrfs_qgroup_rescan_resume(struct btrfs_fs_info *fs_info)
2513 {
2514 if (fs_info->qgroup_flags & BTRFS_QGROUP_STATUS_FLAG_RESCAN)
2515 btrfs_queue_work(fs_info->qgroup_rescan_workers,
2516 &fs_info->qgroup_rescan_work);
2517 }
2518
2519 /*
2520 * Reserve qgroup space for range [start, start + len).
2521 *
2522 * This function will either reserve space from related qgroups or doing
2523 * nothing if the range is already reserved.
2524 *
2525 * Return 0 for successful reserve
2526 * Return <0 for error (including -EQUOT)
2527 *
2528 * NOTE: this function may sleep for memory allocation.
2529 */
2530 int btrfs_qgroup_reserve_data(struct inode *inode, u64 start, u64 len)
2531 {
2532 struct btrfs_root *root = BTRFS_I(inode)->root;
2533 struct extent_changeset changeset;
2534 struct ulist_node *unode;
2535 struct ulist_iterator uiter;
2536 int ret;
2537
2538 if (!root->fs_info->quota_enabled || !is_fstree(root->objectid) ||
2539 len == 0)
2540 return 0;
2541
2542 changeset.bytes_changed = 0;
2543 changeset.range_changed = ulist_alloc(GFP_NOFS);
2544 ret = set_record_extent_bits(&BTRFS_I(inode)->io_tree, start,
2545 start + len -1, EXTENT_QGROUP_RESERVED, GFP_NOFS,
2546 &changeset);
2547 trace_btrfs_qgroup_reserve_data(inode, start, len,
2548 changeset.bytes_changed,
2549 QGROUP_RESERVE);
2550 if (ret < 0)
2551 goto cleanup;
2552 ret = qgroup_reserve(root, changeset.bytes_changed);
2553 if (ret < 0)
2554 goto cleanup;
2555
2556 ulist_free(changeset.range_changed);
2557 return ret;
2558
2559 cleanup:
2560 /* cleanup already reserved ranges */
2561 ULIST_ITER_INIT(&uiter);
2562 while ((unode = ulist_next(changeset.range_changed, &uiter)))
2563 clear_extent_bit(&BTRFS_I(inode)->io_tree, unode->val,
2564 unode->aux, EXTENT_QGROUP_RESERVED, 0, 0, NULL,
2565 GFP_NOFS);
2566 ulist_free(changeset.range_changed);
2567 return ret;
2568 }
2569
2570 static int __btrfs_qgroup_release_data(struct inode *inode, u64 start, u64 len,
2571 int free)
2572 {
2573 struct extent_changeset changeset;
2574 int trace_op = QGROUP_RELEASE;
2575 int ret;
2576
2577 changeset.bytes_changed = 0;
2578 changeset.range_changed = ulist_alloc(GFP_NOFS);
2579 if (!changeset.range_changed)
2580 return -ENOMEM;
2581
2582 ret = clear_record_extent_bits(&BTRFS_I(inode)->io_tree, start,
2583 start + len -1, EXTENT_QGROUP_RESERVED, GFP_NOFS,
2584 &changeset);
2585 if (ret < 0)
2586 goto out;
2587
2588 if (free) {
2589 qgroup_free(BTRFS_I(inode)->root, changeset.bytes_changed);
2590 trace_op = QGROUP_FREE;
2591 }
2592 trace_btrfs_qgroup_release_data(inode, start, len,
2593 changeset.bytes_changed, trace_op);
2594 out:
2595 ulist_free(changeset.range_changed);
2596 return ret;
2597 }
2598
2599 /*
2600 * Free a reserved space range from io_tree and related qgroups
2601 *
2602 * Should be called when a range of pages get invalidated before reaching disk.
2603 * Or for error cleanup case.
2604 *
2605 * For data written to disk, use btrfs_qgroup_release_data().
2606 *
2607 * NOTE: This function may sleep for memory allocation.
2608 */
2609 int btrfs_qgroup_free_data(struct inode *inode, u64 start, u64 len)
2610 {
2611 return __btrfs_qgroup_release_data(inode, start, len, 1);
2612 }
2613
2614 /*
2615 * Release a reserved space range from io_tree only.
2616 *
2617 * Should be called when a range of pages get written to disk and corresponding
2618 * FILE_EXTENT is inserted into corresponding root.
2619 *
2620 * Since new qgroup accounting framework will only update qgroup numbers at
2621 * commit_transaction() time, its reserved space shouldn't be freed from
2622 * related qgroups.
2623 *
2624 * But we should release the range from io_tree, to allow further write to be
2625 * COWed.
2626 *
2627 * NOTE: This function may sleep for memory allocation.
2628 */
2629 int btrfs_qgroup_release_data(struct inode *inode, u64 start, u64 len)
2630 {
2631 return __btrfs_qgroup_release_data(inode, start, len, 0);
2632 }
2633
2634 int btrfs_qgroup_reserve_meta(struct btrfs_root *root, int num_bytes)
2635 {
2636 int ret;
2637
2638 if (!root->fs_info->quota_enabled || !is_fstree(root->objectid) ||
2639 num_bytes == 0)
2640 return 0;
2641
2642 BUG_ON(num_bytes != round_down(num_bytes, root->nodesize));
2643 ret = qgroup_reserve(root, num_bytes);
2644 if (ret < 0)
2645 return ret;
2646 atomic_add(num_bytes, &root->qgroup_meta_rsv);
2647 return ret;
2648 }
2649
2650 void btrfs_qgroup_free_meta_all(struct btrfs_root *root)
2651 {
2652 int reserved;
2653
2654 if (!root->fs_info->quota_enabled || !is_fstree(root->objectid))
2655 return;
2656
2657 reserved = atomic_xchg(&root->qgroup_meta_rsv, 0);
2658 if (reserved == 0)
2659 return;
2660 qgroup_free(root, reserved);
2661 }
2662
2663 void btrfs_qgroup_free_meta(struct btrfs_root *root, int num_bytes)
2664 {
2665 if (!root->fs_info->quota_enabled || !is_fstree(root->objectid))
2666 return;
2667
2668 BUG_ON(num_bytes != round_down(num_bytes, root->nodesize));
2669 WARN_ON(atomic_read(&root->qgroup_meta_rsv) < num_bytes);
2670 atomic_sub(num_bytes, &root->qgroup_meta_rsv);
2671 qgroup_free(root, num_bytes);
2672 }
2673
2674 /*
2675 * Check qgroup reserved space leaking, normally at destory inode
2676 * time
2677 */
2678 void btrfs_qgroup_check_reserved_leak(struct inode *inode)
2679 {
2680 struct extent_changeset changeset;
2681 struct ulist_node *unode;
2682 struct ulist_iterator iter;
2683 int ret;
2684
2685 changeset.bytes_changed = 0;
2686 changeset.range_changed = ulist_alloc(GFP_NOFS);
2687 if (WARN_ON(!changeset.range_changed))
2688 return;
2689
2690 ret = clear_record_extent_bits(&BTRFS_I(inode)->io_tree, 0, (u64)-1,
2691 EXTENT_QGROUP_RESERVED, GFP_NOFS, &changeset);
2692
2693 WARN_ON(ret < 0);
2694 if (WARN_ON(changeset.bytes_changed)) {
2695 ULIST_ITER_INIT(&iter);
2696 while ((unode = ulist_next(changeset.range_changed, &iter))) {
2697 btrfs_warn(BTRFS_I(inode)->root->fs_info,
2698 "leaking qgroup reserved space, ino: %lu, start: %llu, end: %llu",
2699 inode->i_ino, unode->val, unode->aux);
2700 }
2701 qgroup_free(BTRFS_I(inode)->root, changeset.bytes_changed);
2702 }
2703 ulist_free(changeset.range_changed);
2704 }
Linux kernel - Deliverables
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