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Merge branch 'fixes-for-v4.9-rc2' of http://git.agner.ch/git/linux-drm-fsl-dcu into...
[mirror_ubuntu-artful-kernel.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_accounting() 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 (!test_bit(BTRFS_FS_QUOTA_ENABLED, &fs_info->flags))
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, marked as inconsistent");
364 }
365 fs_info->qgroup_flags = btrfs_qgroup_status_flags(l,
366 ptr);
367 rescan_progress = btrfs_qgroup_status_rescan(l, ptr);
368 goto next1;
369 }
370
371 if (found_key.type != BTRFS_QGROUP_INFO_KEY &&
372 found_key.type != BTRFS_QGROUP_LIMIT_KEY)
373 goto next1;
374
375 qgroup = find_qgroup_rb(fs_info, found_key.offset);
376 if ((qgroup && found_key.type == BTRFS_QGROUP_INFO_KEY) ||
377 (!qgroup && found_key.type == BTRFS_QGROUP_LIMIT_KEY)) {
378 btrfs_err(fs_info, "inconsistent qgroup config");
379 flags |= BTRFS_QGROUP_STATUS_FLAG_INCONSISTENT;
380 }
381 if (!qgroup) {
382 qgroup = add_qgroup_rb(fs_info, found_key.offset);
383 if (IS_ERR(qgroup)) {
384 ret = PTR_ERR(qgroup);
385 goto out;
386 }
387 }
388 switch (found_key.type) {
389 case BTRFS_QGROUP_INFO_KEY: {
390 struct btrfs_qgroup_info_item *ptr;
391
392 ptr = btrfs_item_ptr(l, slot,
393 struct btrfs_qgroup_info_item);
394 qgroup->rfer = btrfs_qgroup_info_rfer(l, ptr);
395 qgroup->rfer_cmpr = btrfs_qgroup_info_rfer_cmpr(l, ptr);
396 qgroup->excl = btrfs_qgroup_info_excl(l, ptr);
397 qgroup->excl_cmpr = btrfs_qgroup_info_excl_cmpr(l, ptr);
398 /* generation currently unused */
399 break;
400 }
401 case BTRFS_QGROUP_LIMIT_KEY: {
402 struct btrfs_qgroup_limit_item *ptr;
403
404 ptr = btrfs_item_ptr(l, slot,
405 struct btrfs_qgroup_limit_item);
406 qgroup->lim_flags = btrfs_qgroup_limit_flags(l, ptr);
407 qgroup->max_rfer = btrfs_qgroup_limit_max_rfer(l, ptr);
408 qgroup->max_excl = btrfs_qgroup_limit_max_excl(l, ptr);
409 qgroup->rsv_rfer = btrfs_qgroup_limit_rsv_rfer(l, ptr);
410 qgroup->rsv_excl = btrfs_qgroup_limit_rsv_excl(l, ptr);
411 break;
412 }
413 }
414 next1:
415 ret = btrfs_next_item(quota_root, path);
416 if (ret < 0)
417 goto out;
418 if (ret)
419 break;
420 }
421 btrfs_release_path(path);
422
423 /*
424 * pass 2: read all qgroup relations
425 */
426 key.objectid = 0;
427 key.type = BTRFS_QGROUP_RELATION_KEY;
428 key.offset = 0;
429 ret = btrfs_search_slot_for_read(quota_root, &key, path, 1, 0);
430 if (ret)
431 goto out;
432 while (1) {
433 slot = path->slots[0];
434 l = path->nodes[0];
435 btrfs_item_key_to_cpu(l, &found_key, slot);
436
437 if (found_key.type != BTRFS_QGROUP_RELATION_KEY)
438 goto next2;
439
440 if (found_key.objectid > found_key.offset) {
441 /* parent <- member, not needed to build config */
442 /* FIXME should we omit the key completely? */
443 goto next2;
444 }
445
446 ret = add_relation_rb(fs_info, found_key.objectid,
447 found_key.offset);
448 if (ret == -ENOENT) {
449 btrfs_warn(fs_info,
450 "orphan qgroup relation 0x%llx->0x%llx",
451 found_key.objectid, found_key.offset);
452 ret = 0; /* ignore the error */
453 }
454 if (ret)
455 goto out;
456 next2:
457 ret = btrfs_next_item(quota_root, path);
458 if (ret < 0)
459 goto out;
460 if (ret)
461 break;
462 }
463 out:
464 fs_info->qgroup_flags |= flags;
465 if (!(fs_info->qgroup_flags & BTRFS_QGROUP_STATUS_FLAG_ON))
466 clear_bit(BTRFS_FS_QUOTA_ENABLED, &fs_info->flags);
467 else if (fs_info->qgroup_flags & BTRFS_QGROUP_STATUS_FLAG_RESCAN &&
468 ret >= 0)
469 ret = qgroup_rescan_init(fs_info, rescan_progress, 0);
470 btrfs_free_path(path);
471
472 if (ret < 0) {
473 ulist_free(fs_info->qgroup_ulist);
474 fs_info->qgroup_ulist = NULL;
475 fs_info->qgroup_flags &= ~BTRFS_QGROUP_STATUS_FLAG_RESCAN;
476 }
477
478 return ret < 0 ? ret : 0;
479 }
480
481 /*
482 * This is called from close_ctree() or open_ctree() or btrfs_quota_disable(),
483 * first two are in single-threaded paths.And for the third one, we have set
484 * quota_root to be null with qgroup_lock held before, so it is safe to clean
485 * up the in-memory structures without qgroup_lock held.
486 */
487 void btrfs_free_qgroup_config(struct btrfs_fs_info *fs_info)
488 {
489 struct rb_node *n;
490 struct btrfs_qgroup *qgroup;
491
492 while ((n = rb_first(&fs_info->qgroup_tree))) {
493 qgroup = rb_entry(n, struct btrfs_qgroup, node);
494 rb_erase(n, &fs_info->qgroup_tree);
495 __del_qgroup_rb(qgroup);
496 }
497 /*
498 * we call btrfs_free_qgroup_config() when umounting
499 * filesystem and disabling quota, so we set qgroup_ulist
500 * to be null here to avoid double free.
501 */
502 ulist_free(fs_info->qgroup_ulist);
503 fs_info->qgroup_ulist = NULL;
504 }
505
506 static int add_qgroup_relation_item(struct btrfs_trans_handle *trans,
507 struct btrfs_root *quota_root,
508 u64 src, u64 dst)
509 {
510 int ret;
511 struct btrfs_path *path;
512 struct btrfs_key key;
513
514 path = btrfs_alloc_path();
515 if (!path)
516 return -ENOMEM;
517
518 key.objectid = src;
519 key.type = BTRFS_QGROUP_RELATION_KEY;
520 key.offset = dst;
521
522 ret = btrfs_insert_empty_item(trans, quota_root, path, &key, 0);
523
524 btrfs_mark_buffer_dirty(path->nodes[0]);
525
526 btrfs_free_path(path);
527 return ret;
528 }
529
530 static int del_qgroup_relation_item(struct btrfs_trans_handle *trans,
531 struct btrfs_root *quota_root,
532 u64 src, u64 dst)
533 {
534 int ret;
535 struct btrfs_path *path;
536 struct btrfs_key key;
537
538 path = btrfs_alloc_path();
539 if (!path)
540 return -ENOMEM;
541
542 key.objectid = src;
543 key.type = BTRFS_QGROUP_RELATION_KEY;
544 key.offset = dst;
545
546 ret = btrfs_search_slot(trans, quota_root, &key, path, -1, 1);
547 if (ret < 0)
548 goto out;
549
550 if (ret > 0) {
551 ret = -ENOENT;
552 goto out;
553 }
554
555 ret = btrfs_del_item(trans, quota_root, path);
556 out:
557 btrfs_free_path(path);
558 return ret;
559 }
560
561 static int add_qgroup_item(struct btrfs_trans_handle *trans,
562 struct btrfs_root *quota_root, u64 qgroupid)
563 {
564 int ret;
565 struct btrfs_path *path;
566 struct btrfs_qgroup_info_item *qgroup_info;
567 struct btrfs_qgroup_limit_item *qgroup_limit;
568 struct extent_buffer *leaf;
569 struct btrfs_key key;
570
571 if (btrfs_is_testing(quota_root->fs_info))
572 return 0;
573
574 path = btrfs_alloc_path();
575 if (!path)
576 return -ENOMEM;
577
578 key.objectid = 0;
579 key.type = BTRFS_QGROUP_INFO_KEY;
580 key.offset = qgroupid;
581
582 /*
583 * Avoid a transaction abort by catching -EEXIST here. In that
584 * case, we proceed by re-initializing the existing structure
585 * on disk.
586 */
587
588 ret = btrfs_insert_empty_item(trans, quota_root, path, &key,
589 sizeof(*qgroup_info));
590 if (ret && ret != -EEXIST)
591 goto out;
592
593 leaf = path->nodes[0];
594 qgroup_info = btrfs_item_ptr(leaf, path->slots[0],
595 struct btrfs_qgroup_info_item);
596 btrfs_set_qgroup_info_generation(leaf, qgroup_info, trans->transid);
597 btrfs_set_qgroup_info_rfer(leaf, qgroup_info, 0);
598 btrfs_set_qgroup_info_rfer_cmpr(leaf, qgroup_info, 0);
599 btrfs_set_qgroup_info_excl(leaf, qgroup_info, 0);
600 btrfs_set_qgroup_info_excl_cmpr(leaf, qgroup_info, 0);
601
602 btrfs_mark_buffer_dirty(leaf);
603
604 btrfs_release_path(path);
605
606 key.type = BTRFS_QGROUP_LIMIT_KEY;
607 ret = btrfs_insert_empty_item(trans, quota_root, path, &key,
608 sizeof(*qgroup_limit));
609 if (ret && ret != -EEXIST)
610 goto out;
611
612 leaf = path->nodes[0];
613 qgroup_limit = btrfs_item_ptr(leaf, path->slots[0],
614 struct btrfs_qgroup_limit_item);
615 btrfs_set_qgroup_limit_flags(leaf, qgroup_limit, 0);
616 btrfs_set_qgroup_limit_max_rfer(leaf, qgroup_limit, 0);
617 btrfs_set_qgroup_limit_max_excl(leaf, qgroup_limit, 0);
618 btrfs_set_qgroup_limit_rsv_rfer(leaf, qgroup_limit, 0);
619 btrfs_set_qgroup_limit_rsv_excl(leaf, qgroup_limit, 0);
620
621 btrfs_mark_buffer_dirty(leaf);
622
623 ret = 0;
624 out:
625 btrfs_free_path(path);
626 return ret;
627 }
628
629 static int del_qgroup_item(struct btrfs_trans_handle *trans,
630 struct btrfs_root *quota_root, u64 qgroupid)
631 {
632 int ret;
633 struct btrfs_path *path;
634 struct btrfs_key key;
635
636 path = btrfs_alloc_path();
637 if (!path)
638 return -ENOMEM;
639
640 key.objectid = 0;
641 key.type = BTRFS_QGROUP_INFO_KEY;
642 key.offset = qgroupid;
643 ret = btrfs_search_slot(trans, quota_root, &key, path, -1, 1);
644 if (ret < 0)
645 goto out;
646
647 if (ret > 0) {
648 ret = -ENOENT;
649 goto out;
650 }
651
652 ret = btrfs_del_item(trans, quota_root, path);
653 if (ret)
654 goto out;
655
656 btrfs_release_path(path);
657
658 key.type = BTRFS_QGROUP_LIMIT_KEY;
659 ret = btrfs_search_slot(trans, quota_root, &key, path, -1, 1);
660 if (ret < 0)
661 goto out;
662
663 if (ret > 0) {
664 ret = -ENOENT;
665 goto out;
666 }
667
668 ret = btrfs_del_item(trans, quota_root, path);
669
670 out:
671 btrfs_free_path(path);
672 return ret;
673 }
674
675 static int update_qgroup_limit_item(struct btrfs_trans_handle *trans,
676 struct btrfs_root *root,
677 struct btrfs_qgroup *qgroup)
678 {
679 struct btrfs_path *path;
680 struct btrfs_key key;
681 struct extent_buffer *l;
682 struct btrfs_qgroup_limit_item *qgroup_limit;
683 int ret;
684 int slot;
685
686 key.objectid = 0;
687 key.type = BTRFS_QGROUP_LIMIT_KEY;
688 key.offset = qgroup->qgroupid;
689
690 path = btrfs_alloc_path();
691 if (!path)
692 return -ENOMEM;
693
694 ret = btrfs_search_slot(trans, root, &key, path, 0, 1);
695 if (ret > 0)
696 ret = -ENOENT;
697
698 if (ret)
699 goto out;
700
701 l = path->nodes[0];
702 slot = path->slots[0];
703 qgroup_limit = btrfs_item_ptr(l, slot, struct btrfs_qgroup_limit_item);
704 btrfs_set_qgroup_limit_flags(l, qgroup_limit, qgroup->lim_flags);
705 btrfs_set_qgroup_limit_max_rfer(l, qgroup_limit, qgroup->max_rfer);
706 btrfs_set_qgroup_limit_max_excl(l, qgroup_limit, qgroup->max_excl);
707 btrfs_set_qgroup_limit_rsv_rfer(l, qgroup_limit, qgroup->rsv_rfer);
708 btrfs_set_qgroup_limit_rsv_excl(l, qgroup_limit, qgroup->rsv_excl);
709
710 btrfs_mark_buffer_dirty(l);
711
712 out:
713 btrfs_free_path(path);
714 return ret;
715 }
716
717 static int update_qgroup_info_item(struct btrfs_trans_handle *trans,
718 struct btrfs_root *root,
719 struct btrfs_qgroup *qgroup)
720 {
721 struct btrfs_path *path;
722 struct btrfs_key key;
723 struct extent_buffer *l;
724 struct btrfs_qgroup_info_item *qgroup_info;
725 int ret;
726 int slot;
727
728 if (btrfs_is_testing(root->fs_info))
729 return 0;
730
731 key.objectid = 0;
732 key.type = BTRFS_QGROUP_INFO_KEY;
733 key.offset = qgroup->qgroupid;
734
735 path = btrfs_alloc_path();
736 if (!path)
737 return -ENOMEM;
738
739 ret = btrfs_search_slot(trans, root, &key, path, 0, 1);
740 if (ret > 0)
741 ret = -ENOENT;
742
743 if (ret)
744 goto out;
745
746 l = path->nodes[0];
747 slot = path->slots[0];
748 qgroup_info = btrfs_item_ptr(l, slot, struct btrfs_qgroup_info_item);
749 btrfs_set_qgroup_info_generation(l, qgroup_info, trans->transid);
750 btrfs_set_qgroup_info_rfer(l, qgroup_info, qgroup->rfer);
751 btrfs_set_qgroup_info_rfer_cmpr(l, qgroup_info, qgroup->rfer_cmpr);
752 btrfs_set_qgroup_info_excl(l, qgroup_info, qgroup->excl);
753 btrfs_set_qgroup_info_excl_cmpr(l, qgroup_info, qgroup->excl_cmpr);
754
755 btrfs_mark_buffer_dirty(l);
756
757 out:
758 btrfs_free_path(path);
759 return ret;
760 }
761
762 static int update_qgroup_status_item(struct btrfs_trans_handle *trans,
763 struct btrfs_fs_info *fs_info,
764 struct btrfs_root *root)
765 {
766 struct btrfs_path *path;
767 struct btrfs_key key;
768 struct extent_buffer *l;
769 struct btrfs_qgroup_status_item *ptr;
770 int ret;
771 int slot;
772
773 key.objectid = 0;
774 key.type = BTRFS_QGROUP_STATUS_KEY;
775 key.offset = 0;
776
777 path = btrfs_alloc_path();
778 if (!path)
779 return -ENOMEM;
780
781 ret = btrfs_search_slot(trans, root, &key, path, 0, 1);
782 if (ret > 0)
783 ret = -ENOENT;
784
785 if (ret)
786 goto out;
787
788 l = path->nodes[0];
789 slot = path->slots[0];
790 ptr = btrfs_item_ptr(l, slot, struct btrfs_qgroup_status_item);
791 btrfs_set_qgroup_status_flags(l, ptr, fs_info->qgroup_flags);
792 btrfs_set_qgroup_status_generation(l, ptr, trans->transid);
793 btrfs_set_qgroup_status_rescan(l, ptr,
794 fs_info->qgroup_rescan_progress.objectid);
795
796 btrfs_mark_buffer_dirty(l);
797
798 out:
799 btrfs_free_path(path);
800 return ret;
801 }
802
803 /*
804 * called with qgroup_lock held
805 */
806 static int btrfs_clean_quota_tree(struct btrfs_trans_handle *trans,
807 struct btrfs_root *root)
808 {
809 struct btrfs_path *path;
810 struct btrfs_key key;
811 struct extent_buffer *leaf = NULL;
812 int ret;
813 int nr = 0;
814
815 path = btrfs_alloc_path();
816 if (!path)
817 return -ENOMEM;
818
819 path->leave_spinning = 1;
820
821 key.objectid = 0;
822 key.offset = 0;
823 key.type = 0;
824
825 while (1) {
826 ret = btrfs_search_slot(trans, root, &key, path, -1, 1);
827 if (ret < 0)
828 goto out;
829 leaf = path->nodes[0];
830 nr = btrfs_header_nritems(leaf);
831 if (!nr)
832 break;
833 /*
834 * delete the leaf one by one
835 * since the whole tree is going
836 * to be deleted.
837 */
838 path->slots[0] = 0;
839 ret = btrfs_del_items(trans, root, path, 0, nr);
840 if (ret)
841 goto out;
842
843 btrfs_release_path(path);
844 }
845 ret = 0;
846 out:
847 set_bit(BTRFS_FS_QUOTA_DISABLING, &root->fs_info->flags);
848 btrfs_free_path(path);
849 return ret;
850 }
851
852 int btrfs_quota_enable(struct btrfs_trans_handle *trans,
853 struct btrfs_fs_info *fs_info)
854 {
855 struct btrfs_root *quota_root;
856 struct btrfs_root *tree_root = fs_info->tree_root;
857 struct btrfs_path *path = NULL;
858 struct btrfs_qgroup_status_item *ptr;
859 struct extent_buffer *leaf;
860 struct btrfs_key key;
861 struct btrfs_key found_key;
862 struct btrfs_qgroup *qgroup = NULL;
863 int ret = 0;
864 int slot;
865
866 mutex_lock(&fs_info->qgroup_ioctl_lock);
867 if (fs_info->quota_root) {
868 set_bit(BTRFS_FS_QUOTA_ENABLING, &fs_info->flags);
869 goto out;
870 }
871
872 fs_info->qgroup_ulist = ulist_alloc(GFP_NOFS);
873 if (!fs_info->qgroup_ulist) {
874 ret = -ENOMEM;
875 goto out;
876 }
877
878 /*
879 * initially create the quota tree
880 */
881 quota_root = btrfs_create_tree(trans, fs_info,
882 BTRFS_QUOTA_TREE_OBJECTID);
883 if (IS_ERR(quota_root)) {
884 ret = PTR_ERR(quota_root);
885 goto out;
886 }
887
888 path = btrfs_alloc_path();
889 if (!path) {
890 ret = -ENOMEM;
891 goto out_free_root;
892 }
893
894 key.objectid = 0;
895 key.type = BTRFS_QGROUP_STATUS_KEY;
896 key.offset = 0;
897
898 ret = btrfs_insert_empty_item(trans, quota_root, path, &key,
899 sizeof(*ptr));
900 if (ret)
901 goto out_free_path;
902
903 leaf = path->nodes[0];
904 ptr = btrfs_item_ptr(leaf, path->slots[0],
905 struct btrfs_qgroup_status_item);
906 btrfs_set_qgroup_status_generation(leaf, ptr, trans->transid);
907 btrfs_set_qgroup_status_version(leaf, ptr, BTRFS_QGROUP_STATUS_VERSION);
908 fs_info->qgroup_flags = BTRFS_QGROUP_STATUS_FLAG_ON |
909 BTRFS_QGROUP_STATUS_FLAG_INCONSISTENT;
910 btrfs_set_qgroup_status_flags(leaf, ptr, fs_info->qgroup_flags);
911 btrfs_set_qgroup_status_rescan(leaf, ptr, 0);
912
913 btrfs_mark_buffer_dirty(leaf);
914
915 key.objectid = 0;
916 key.type = BTRFS_ROOT_REF_KEY;
917 key.offset = 0;
918
919 btrfs_release_path(path);
920 ret = btrfs_search_slot_for_read(tree_root, &key, path, 1, 0);
921 if (ret > 0)
922 goto out_add_root;
923 if (ret < 0)
924 goto out_free_path;
925
926
927 while (1) {
928 slot = path->slots[0];
929 leaf = path->nodes[0];
930 btrfs_item_key_to_cpu(leaf, &found_key, slot);
931
932 if (found_key.type == BTRFS_ROOT_REF_KEY) {
933 ret = add_qgroup_item(trans, quota_root,
934 found_key.offset);
935 if (ret)
936 goto out_free_path;
937
938 qgroup = add_qgroup_rb(fs_info, found_key.offset);
939 if (IS_ERR(qgroup)) {
940 ret = PTR_ERR(qgroup);
941 goto out_free_path;
942 }
943 }
944 ret = btrfs_next_item(tree_root, path);
945 if (ret < 0)
946 goto out_free_path;
947 if (ret)
948 break;
949 }
950
951 out_add_root:
952 btrfs_release_path(path);
953 ret = add_qgroup_item(trans, quota_root, BTRFS_FS_TREE_OBJECTID);
954 if (ret)
955 goto out_free_path;
956
957 qgroup = add_qgroup_rb(fs_info, BTRFS_FS_TREE_OBJECTID);
958 if (IS_ERR(qgroup)) {
959 ret = PTR_ERR(qgroup);
960 goto out_free_path;
961 }
962 spin_lock(&fs_info->qgroup_lock);
963 fs_info->quota_root = quota_root;
964 set_bit(BTRFS_FS_QUOTA_ENABLING, &fs_info->flags);
965 spin_unlock(&fs_info->qgroup_lock);
966 out_free_path:
967 btrfs_free_path(path);
968 out_free_root:
969 if (ret) {
970 free_extent_buffer(quota_root->node);
971 free_extent_buffer(quota_root->commit_root);
972 kfree(quota_root);
973 }
974 out:
975 if (ret) {
976 ulist_free(fs_info->qgroup_ulist);
977 fs_info->qgroup_ulist = NULL;
978 }
979 mutex_unlock(&fs_info->qgroup_ioctl_lock);
980 return ret;
981 }
982
983 int btrfs_quota_disable(struct btrfs_trans_handle *trans,
984 struct btrfs_fs_info *fs_info)
985 {
986 struct btrfs_root *tree_root = fs_info->tree_root;
987 struct btrfs_root *quota_root;
988 int ret = 0;
989
990 mutex_lock(&fs_info->qgroup_ioctl_lock);
991 if (!fs_info->quota_root)
992 goto out;
993 clear_bit(BTRFS_FS_QUOTA_ENABLED, &fs_info->flags);
994 set_bit(BTRFS_FS_QUOTA_DISABLING, &fs_info->flags);
995 btrfs_qgroup_wait_for_completion(fs_info, false);
996 spin_lock(&fs_info->qgroup_lock);
997 quota_root = fs_info->quota_root;
998 fs_info->quota_root = NULL;
999 fs_info->qgroup_flags &= ~BTRFS_QGROUP_STATUS_FLAG_ON;
1000 spin_unlock(&fs_info->qgroup_lock);
1001
1002 btrfs_free_qgroup_config(fs_info);
1003
1004 ret = btrfs_clean_quota_tree(trans, quota_root);
1005 if (ret)
1006 goto out;
1007
1008 ret = btrfs_del_root(trans, tree_root, &quota_root->root_key);
1009 if (ret)
1010 goto out;
1011
1012 list_del(&quota_root->dirty_list);
1013
1014 btrfs_tree_lock(quota_root->node);
1015 clean_tree_block(trans, tree_root->fs_info, quota_root->node);
1016 btrfs_tree_unlock(quota_root->node);
1017 btrfs_free_tree_block(trans, quota_root, quota_root->node, 0, 1);
1018
1019 free_extent_buffer(quota_root->node);
1020 free_extent_buffer(quota_root->commit_root);
1021 kfree(quota_root);
1022 out:
1023 mutex_unlock(&fs_info->qgroup_ioctl_lock);
1024 return ret;
1025 }
1026
1027 static void qgroup_dirty(struct btrfs_fs_info *fs_info,
1028 struct btrfs_qgroup *qgroup)
1029 {
1030 if (list_empty(&qgroup->dirty))
1031 list_add(&qgroup->dirty, &fs_info->dirty_qgroups);
1032 }
1033
1034 /*
1035 * The easy accounting, if we are adding/removing the only ref for an extent
1036 * then this qgroup and all of the parent qgroups get their reference and
1037 * exclusive counts adjusted.
1038 *
1039 * Caller should hold fs_info->qgroup_lock.
1040 */
1041 static int __qgroup_excl_accounting(struct btrfs_fs_info *fs_info,
1042 struct ulist *tmp, u64 ref_root,
1043 u64 num_bytes, int sign)
1044 {
1045 struct btrfs_qgroup *qgroup;
1046 struct btrfs_qgroup_list *glist;
1047 struct ulist_node *unode;
1048 struct ulist_iterator uiter;
1049 int ret = 0;
1050
1051 qgroup = find_qgroup_rb(fs_info, ref_root);
1052 if (!qgroup)
1053 goto out;
1054
1055 qgroup->rfer += sign * num_bytes;
1056 qgroup->rfer_cmpr += sign * num_bytes;
1057
1058 WARN_ON(sign < 0 && qgroup->excl < num_bytes);
1059 qgroup->excl += sign * num_bytes;
1060 qgroup->excl_cmpr += sign * num_bytes;
1061 if (sign > 0)
1062 qgroup->reserved -= num_bytes;
1063
1064 qgroup_dirty(fs_info, qgroup);
1065
1066 /* Get all of the parent groups that contain this qgroup */
1067 list_for_each_entry(glist, &qgroup->groups, next_group) {
1068 ret = ulist_add(tmp, glist->group->qgroupid,
1069 ptr_to_u64(glist->group), GFP_ATOMIC);
1070 if (ret < 0)
1071 goto out;
1072 }
1073
1074 /* Iterate all of the parents and adjust their reference counts */
1075 ULIST_ITER_INIT(&uiter);
1076 while ((unode = ulist_next(tmp, &uiter))) {
1077 qgroup = u64_to_ptr(unode->aux);
1078 qgroup->rfer += sign * num_bytes;
1079 qgroup->rfer_cmpr += sign * num_bytes;
1080 WARN_ON(sign < 0 && qgroup->excl < num_bytes);
1081 qgroup->excl += sign * num_bytes;
1082 if (sign > 0)
1083 qgroup->reserved -= num_bytes;
1084 qgroup->excl_cmpr += sign * num_bytes;
1085 qgroup_dirty(fs_info, qgroup);
1086
1087 /* Add any parents of the parents */
1088 list_for_each_entry(glist, &qgroup->groups, next_group) {
1089 ret = ulist_add(tmp, glist->group->qgroupid,
1090 ptr_to_u64(glist->group), GFP_ATOMIC);
1091 if (ret < 0)
1092 goto out;
1093 }
1094 }
1095 ret = 0;
1096 out:
1097 return ret;
1098 }
1099
1100
1101 /*
1102 * Quick path for updating qgroup with only excl refs.
1103 *
1104 * In that case, just update all parent will be enough.
1105 * Or we needs to do a full rescan.
1106 * Caller should also hold fs_info->qgroup_lock.
1107 *
1108 * Return 0 for quick update, return >0 for need to full rescan
1109 * and mark INCONSISTENT flag.
1110 * Return < 0 for other error.
1111 */
1112 static int quick_update_accounting(struct btrfs_fs_info *fs_info,
1113 struct ulist *tmp, u64 src, u64 dst,
1114 int sign)
1115 {
1116 struct btrfs_qgroup *qgroup;
1117 int ret = 1;
1118 int err = 0;
1119
1120 qgroup = find_qgroup_rb(fs_info, src);
1121 if (!qgroup)
1122 goto out;
1123 if (qgroup->excl == qgroup->rfer) {
1124 ret = 0;
1125 err = __qgroup_excl_accounting(fs_info, tmp, dst,
1126 qgroup->excl, sign);
1127 if (err < 0) {
1128 ret = err;
1129 goto out;
1130 }
1131 }
1132 out:
1133 if (ret)
1134 fs_info->qgroup_flags |= BTRFS_QGROUP_STATUS_FLAG_INCONSISTENT;
1135 return ret;
1136 }
1137
1138 int btrfs_add_qgroup_relation(struct btrfs_trans_handle *trans,
1139 struct btrfs_fs_info *fs_info, u64 src, u64 dst)
1140 {
1141 struct btrfs_root *quota_root;
1142 struct btrfs_qgroup *parent;
1143 struct btrfs_qgroup *member;
1144 struct btrfs_qgroup_list *list;
1145 struct ulist *tmp;
1146 int ret = 0;
1147
1148 /* Check the level of src and dst first */
1149 if (btrfs_qgroup_level(src) >= btrfs_qgroup_level(dst))
1150 return -EINVAL;
1151
1152 tmp = ulist_alloc(GFP_NOFS);
1153 if (!tmp)
1154 return -ENOMEM;
1155
1156 mutex_lock(&fs_info->qgroup_ioctl_lock);
1157 quota_root = fs_info->quota_root;
1158 if (!quota_root) {
1159 ret = -EINVAL;
1160 goto out;
1161 }
1162 member = find_qgroup_rb(fs_info, src);
1163 parent = find_qgroup_rb(fs_info, dst);
1164 if (!member || !parent) {
1165 ret = -EINVAL;
1166 goto out;
1167 }
1168
1169 /* check if such qgroup relation exist firstly */
1170 list_for_each_entry(list, &member->groups, next_group) {
1171 if (list->group == parent) {
1172 ret = -EEXIST;
1173 goto out;
1174 }
1175 }
1176
1177 ret = add_qgroup_relation_item(trans, quota_root, src, dst);
1178 if (ret)
1179 goto out;
1180
1181 ret = add_qgroup_relation_item(trans, quota_root, dst, src);
1182 if (ret) {
1183 del_qgroup_relation_item(trans, quota_root, src, dst);
1184 goto out;
1185 }
1186
1187 spin_lock(&fs_info->qgroup_lock);
1188 ret = add_relation_rb(quota_root->fs_info, src, dst);
1189 if (ret < 0) {
1190 spin_unlock(&fs_info->qgroup_lock);
1191 goto out;
1192 }
1193 ret = quick_update_accounting(fs_info, tmp, src, dst, 1);
1194 spin_unlock(&fs_info->qgroup_lock);
1195 out:
1196 mutex_unlock(&fs_info->qgroup_ioctl_lock);
1197 ulist_free(tmp);
1198 return ret;
1199 }
1200
1201 int __del_qgroup_relation(struct btrfs_trans_handle *trans,
1202 struct btrfs_fs_info *fs_info, u64 src, u64 dst)
1203 {
1204 struct btrfs_root *quota_root;
1205 struct btrfs_qgroup *parent;
1206 struct btrfs_qgroup *member;
1207 struct btrfs_qgroup_list *list;
1208 struct ulist *tmp;
1209 int ret = 0;
1210 int err;
1211
1212 tmp = ulist_alloc(GFP_NOFS);
1213 if (!tmp)
1214 return -ENOMEM;
1215
1216 quota_root = fs_info->quota_root;
1217 if (!quota_root) {
1218 ret = -EINVAL;
1219 goto out;
1220 }
1221
1222 member = find_qgroup_rb(fs_info, src);
1223 parent = find_qgroup_rb(fs_info, dst);
1224 if (!member || !parent) {
1225 ret = -EINVAL;
1226 goto out;
1227 }
1228
1229 /* check if such qgroup relation exist firstly */
1230 list_for_each_entry(list, &member->groups, next_group) {
1231 if (list->group == parent)
1232 goto exist;
1233 }
1234 ret = -ENOENT;
1235 goto out;
1236 exist:
1237 ret = del_qgroup_relation_item(trans, quota_root, src, dst);
1238 err = del_qgroup_relation_item(trans, quota_root, dst, src);
1239 if (err && !ret)
1240 ret = err;
1241
1242 spin_lock(&fs_info->qgroup_lock);
1243 del_relation_rb(fs_info, src, dst);
1244 ret = quick_update_accounting(fs_info, tmp, src, dst, -1);
1245 spin_unlock(&fs_info->qgroup_lock);
1246 out:
1247 ulist_free(tmp);
1248 return ret;
1249 }
1250
1251 int btrfs_del_qgroup_relation(struct btrfs_trans_handle *trans,
1252 struct btrfs_fs_info *fs_info, u64 src, u64 dst)
1253 {
1254 int ret = 0;
1255
1256 mutex_lock(&fs_info->qgroup_ioctl_lock);
1257 ret = __del_qgroup_relation(trans, fs_info, src, dst);
1258 mutex_unlock(&fs_info->qgroup_ioctl_lock);
1259
1260 return ret;
1261 }
1262
1263 int btrfs_create_qgroup(struct btrfs_trans_handle *trans,
1264 struct btrfs_fs_info *fs_info, u64 qgroupid)
1265 {
1266 struct btrfs_root *quota_root;
1267 struct btrfs_qgroup *qgroup;
1268 int ret = 0;
1269
1270 mutex_lock(&fs_info->qgroup_ioctl_lock);
1271 quota_root = fs_info->quota_root;
1272 if (!quota_root) {
1273 ret = -EINVAL;
1274 goto out;
1275 }
1276 qgroup = find_qgroup_rb(fs_info, qgroupid);
1277 if (qgroup) {
1278 ret = -EEXIST;
1279 goto out;
1280 }
1281
1282 ret = add_qgroup_item(trans, quota_root, qgroupid);
1283 if (ret)
1284 goto out;
1285
1286 spin_lock(&fs_info->qgroup_lock);
1287 qgroup = add_qgroup_rb(fs_info, qgroupid);
1288 spin_unlock(&fs_info->qgroup_lock);
1289
1290 if (IS_ERR(qgroup))
1291 ret = PTR_ERR(qgroup);
1292 out:
1293 mutex_unlock(&fs_info->qgroup_ioctl_lock);
1294 return ret;
1295 }
1296
1297 int btrfs_remove_qgroup(struct btrfs_trans_handle *trans,
1298 struct btrfs_fs_info *fs_info, u64 qgroupid)
1299 {
1300 struct btrfs_root *quota_root;
1301 struct btrfs_qgroup *qgroup;
1302 struct btrfs_qgroup_list *list;
1303 int ret = 0;
1304
1305 mutex_lock(&fs_info->qgroup_ioctl_lock);
1306 quota_root = fs_info->quota_root;
1307 if (!quota_root) {
1308 ret = -EINVAL;
1309 goto out;
1310 }
1311
1312 qgroup = find_qgroup_rb(fs_info, qgroupid);
1313 if (!qgroup) {
1314 ret = -ENOENT;
1315 goto out;
1316 } else {
1317 /* check if there are no children of this qgroup */
1318 if (!list_empty(&qgroup->members)) {
1319 ret = -EBUSY;
1320 goto out;
1321 }
1322 }
1323 ret = del_qgroup_item(trans, quota_root, qgroupid);
1324
1325 while (!list_empty(&qgroup->groups)) {
1326 list = list_first_entry(&qgroup->groups,
1327 struct btrfs_qgroup_list, next_group);
1328 ret = __del_qgroup_relation(trans, fs_info,
1329 qgroupid,
1330 list->group->qgroupid);
1331 if (ret)
1332 goto out;
1333 }
1334
1335 spin_lock(&fs_info->qgroup_lock);
1336 del_qgroup_rb(quota_root->fs_info, qgroupid);
1337 spin_unlock(&fs_info->qgroup_lock);
1338 out:
1339 mutex_unlock(&fs_info->qgroup_ioctl_lock);
1340 return ret;
1341 }
1342
1343 int btrfs_limit_qgroup(struct btrfs_trans_handle *trans,
1344 struct btrfs_fs_info *fs_info, u64 qgroupid,
1345 struct btrfs_qgroup_limit *limit)
1346 {
1347 struct btrfs_root *quota_root;
1348 struct btrfs_qgroup *qgroup;
1349 int ret = 0;
1350 /* Sometimes we would want to clear the limit on this qgroup.
1351 * To meet this requirement, we treat the -1 as a special value
1352 * which tell kernel to clear the limit on this qgroup.
1353 */
1354 const u64 CLEAR_VALUE = -1;
1355
1356 mutex_lock(&fs_info->qgroup_ioctl_lock);
1357 quota_root = fs_info->quota_root;
1358 if (!quota_root) {
1359 ret = -EINVAL;
1360 goto out;
1361 }
1362
1363 qgroup = find_qgroup_rb(fs_info, qgroupid);
1364 if (!qgroup) {
1365 ret = -ENOENT;
1366 goto out;
1367 }
1368
1369 spin_lock(&fs_info->qgroup_lock);
1370 if (limit->flags & BTRFS_QGROUP_LIMIT_MAX_RFER) {
1371 if (limit->max_rfer == CLEAR_VALUE) {
1372 qgroup->lim_flags &= ~BTRFS_QGROUP_LIMIT_MAX_RFER;
1373 limit->flags &= ~BTRFS_QGROUP_LIMIT_MAX_RFER;
1374 qgroup->max_rfer = 0;
1375 } else {
1376 qgroup->max_rfer = limit->max_rfer;
1377 }
1378 }
1379 if (limit->flags & BTRFS_QGROUP_LIMIT_MAX_EXCL) {
1380 if (limit->max_excl == CLEAR_VALUE) {
1381 qgroup->lim_flags &= ~BTRFS_QGROUP_LIMIT_MAX_EXCL;
1382 limit->flags &= ~BTRFS_QGROUP_LIMIT_MAX_EXCL;
1383 qgroup->max_excl = 0;
1384 } else {
1385 qgroup->max_excl = limit->max_excl;
1386 }
1387 }
1388 if (limit->flags & BTRFS_QGROUP_LIMIT_RSV_RFER) {
1389 if (limit->rsv_rfer == CLEAR_VALUE) {
1390 qgroup->lim_flags &= ~BTRFS_QGROUP_LIMIT_RSV_RFER;
1391 limit->flags &= ~BTRFS_QGROUP_LIMIT_RSV_RFER;
1392 qgroup->rsv_rfer = 0;
1393 } else {
1394 qgroup->rsv_rfer = limit->rsv_rfer;
1395 }
1396 }
1397 if (limit->flags & BTRFS_QGROUP_LIMIT_RSV_EXCL) {
1398 if (limit->rsv_excl == CLEAR_VALUE) {
1399 qgroup->lim_flags &= ~BTRFS_QGROUP_LIMIT_RSV_EXCL;
1400 limit->flags &= ~BTRFS_QGROUP_LIMIT_RSV_EXCL;
1401 qgroup->rsv_excl = 0;
1402 } else {
1403 qgroup->rsv_excl = limit->rsv_excl;
1404 }
1405 }
1406 qgroup->lim_flags |= limit->flags;
1407
1408 spin_unlock(&fs_info->qgroup_lock);
1409
1410 ret = update_qgroup_limit_item(trans, quota_root, qgroup);
1411 if (ret) {
1412 fs_info->qgroup_flags |= BTRFS_QGROUP_STATUS_FLAG_INCONSISTENT;
1413 btrfs_info(fs_info, "unable to update quota limit for %llu",
1414 qgroupid);
1415 }
1416
1417 out:
1418 mutex_unlock(&fs_info->qgroup_ioctl_lock);
1419 return ret;
1420 }
1421
1422 int btrfs_qgroup_prepare_account_extents(struct btrfs_trans_handle *trans,
1423 struct btrfs_fs_info *fs_info)
1424 {
1425 struct btrfs_qgroup_extent_record *record;
1426 struct btrfs_delayed_ref_root *delayed_refs;
1427 struct rb_node *node;
1428 u64 qgroup_to_skip;
1429 int ret = 0;
1430
1431 delayed_refs = &trans->transaction->delayed_refs;
1432 qgroup_to_skip = delayed_refs->qgroup_to_skip;
1433
1434 /*
1435 * No need to do lock, since this function will only be called in
1436 * btrfs_commit_transaction().
1437 */
1438 node = rb_first(&delayed_refs->dirty_extent_root);
1439 while (node) {
1440 record = rb_entry(node, struct btrfs_qgroup_extent_record,
1441 node);
1442 ret = btrfs_find_all_roots(NULL, fs_info, record->bytenr, 0,
1443 &record->old_roots);
1444 if (ret < 0)
1445 break;
1446 if (qgroup_to_skip)
1447 ulist_del(record->old_roots, qgroup_to_skip, 0);
1448 node = rb_next(node);
1449 }
1450 return ret;
1451 }
1452
1453 int btrfs_qgroup_insert_dirty_extent_nolock(struct btrfs_fs_info *fs_info,
1454 struct btrfs_delayed_ref_root *delayed_refs,
1455 struct btrfs_qgroup_extent_record *record)
1456 {
1457 struct rb_node **p = &delayed_refs->dirty_extent_root.rb_node;
1458 struct rb_node *parent_node = NULL;
1459 struct btrfs_qgroup_extent_record *entry;
1460 u64 bytenr = record->bytenr;
1461
1462 assert_spin_locked(&delayed_refs->lock);
1463 trace_btrfs_qgroup_insert_dirty_extent(fs_info, record);
1464
1465 while (*p) {
1466 parent_node = *p;
1467 entry = rb_entry(parent_node, struct btrfs_qgroup_extent_record,
1468 node);
1469 if (bytenr < entry->bytenr)
1470 p = &(*p)->rb_left;
1471 else if (bytenr > entry->bytenr)
1472 p = &(*p)->rb_right;
1473 else
1474 return 1;
1475 }
1476
1477 rb_link_node(&record->node, parent_node, p);
1478 rb_insert_color(&record->node, &delayed_refs->dirty_extent_root);
1479 return 0;
1480 }
1481
1482 int btrfs_qgroup_insert_dirty_extent(struct btrfs_trans_handle *trans,
1483 struct btrfs_fs_info *fs_info, u64 bytenr, u64 num_bytes,
1484 gfp_t gfp_flag)
1485 {
1486 struct btrfs_qgroup_extent_record *record;
1487 struct btrfs_delayed_ref_root *delayed_refs;
1488 int ret;
1489
1490 if (!test_bit(BTRFS_FS_QUOTA_ENABLED, &fs_info->flags)
1491 || bytenr == 0 || num_bytes == 0)
1492 return 0;
1493 if (WARN_ON(trans == NULL))
1494 return -EINVAL;
1495 record = kmalloc(sizeof(*record), gfp_flag);
1496 if (!record)
1497 return -ENOMEM;
1498
1499 delayed_refs = &trans->transaction->delayed_refs;
1500 record->bytenr = bytenr;
1501 record->num_bytes = num_bytes;
1502 record->old_roots = NULL;
1503
1504 spin_lock(&delayed_refs->lock);
1505 ret = btrfs_qgroup_insert_dirty_extent_nolock(fs_info, delayed_refs,
1506 record);
1507 spin_unlock(&delayed_refs->lock);
1508 if (ret > 0)
1509 kfree(record);
1510 return 0;
1511 }
1512
1513 #define UPDATE_NEW 0
1514 #define UPDATE_OLD 1
1515 /*
1516 * Walk all of the roots that points to the bytenr and adjust their refcnts.
1517 */
1518 static int qgroup_update_refcnt(struct btrfs_fs_info *fs_info,
1519 struct ulist *roots, struct ulist *tmp,
1520 struct ulist *qgroups, u64 seq, int update_old)
1521 {
1522 struct ulist_node *unode;
1523 struct ulist_iterator uiter;
1524 struct ulist_node *tmp_unode;
1525 struct ulist_iterator tmp_uiter;
1526 struct btrfs_qgroup *qg;
1527 int ret = 0;
1528
1529 if (!roots)
1530 return 0;
1531 ULIST_ITER_INIT(&uiter);
1532 while ((unode = ulist_next(roots, &uiter))) {
1533 qg = find_qgroup_rb(fs_info, unode->val);
1534 if (!qg)
1535 continue;
1536
1537 ulist_reinit(tmp);
1538 ret = ulist_add(qgroups, qg->qgroupid, ptr_to_u64(qg),
1539 GFP_ATOMIC);
1540 if (ret < 0)
1541 return ret;
1542 ret = ulist_add(tmp, qg->qgroupid, ptr_to_u64(qg), GFP_ATOMIC);
1543 if (ret < 0)
1544 return ret;
1545 ULIST_ITER_INIT(&tmp_uiter);
1546 while ((tmp_unode = ulist_next(tmp, &tmp_uiter))) {
1547 struct btrfs_qgroup_list *glist;
1548
1549 qg = u64_to_ptr(tmp_unode->aux);
1550 if (update_old)
1551 btrfs_qgroup_update_old_refcnt(qg, seq, 1);
1552 else
1553 btrfs_qgroup_update_new_refcnt(qg, seq, 1);
1554 list_for_each_entry(glist, &qg->groups, next_group) {
1555 ret = ulist_add(qgroups, glist->group->qgroupid,
1556 ptr_to_u64(glist->group),
1557 GFP_ATOMIC);
1558 if (ret < 0)
1559 return ret;
1560 ret = ulist_add(tmp, glist->group->qgroupid,
1561 ptr_to_u64(glist->group),
1562 GFP_ATOMIC);
1563 if (ret < 0)
1564 return ret;
1565 }
1566 }
1567 }
1568 return 0;
1569 }
1570
1571 /*
1572 * Update qgroup rfer/excl counters.
1573 * Rfer update is easy, codes can explain themselves.
1574 *
1575 * Excl update is tricky, the update is split into 2 part.
1576 * Part 1: Possible exclusive <-> sharing detect:
1577 * | A | !A |
1578 * -------------------------------------
1579 * B | * | - |
1580 * -------------------------------------
1581 * !B | + | ** |
1582 * -------------------------------------
1583 *
1584 * Conditions:
1585 * A: cur_old_roots < nr_old_roots (not exclusive before)
1586 * !A: cur_old_roots == nr_old_roots (possible exclusive before)
1587 * B: cur_new_roots < nr_new_roots (not exclusive now)
1588 * !B: cur_new_roots == nr_new_roots (possible exclusive now)
1589 *
1590 * Results:
1591 * +: Possible sharing -> exclusive -: Possible exclusive -> sharing
1592 * *: Definitely not changed. **: Possible unchanged.
1593 *
1594 * For !A and !B condition, the exception is cur_old/new_roots == 0 case.
1595 *
1596 * To make the logic clear, we first use condition A and B to split
1597 * combination into 4 results.
1598 *
1599 * Then, for result "+" and "-", check old/new_roots == 0 case, as in them
1600 * only on variant maybe 0.
1601 *
1602 * Lastly, check result **, since there are 2 variants maybe 0, split them
1603 * again(2x2).
1604 * But this time we don't need to consider other things, the codes and logic
1605 * is easy to understand now.
1606 */
1607 static int qgroup_update_counters(struct btrfs_fs_info *fs_info,
1608 struct ulist *qgroups,
1609 u64 nr_old_roots,
1610 u64 nr_new_roots,
1611 u64 num_bytes, u64 seq)
1612 {
1613 struct ulist_node *unode;
1614 struct ulist_iterator uiter;
1615 struct btrfs_qgroup *qg;
1616 u64 cur_new_count, cur_old_count;
1617
1618 ULIST_ITER_INIT(&uiter);
1619 while ((unode = ulist_next(qgroups, &uiter))) {
1620 bool dirty = false;
1621
1622 qg = u64_to_ptr(unode->aux);
1623 cur_old_count = btrfs_qgroup_get_old_refcnt(qg, seq);
1624 cur_new_count = btrfs_qgroup_get_new_refcnt(qg, seq);
1625
1626 trace_qgroup_update_counters(fs_info, qg->qgroupid,
1627 cur_old_count, cur_new_count);
1628
1629 /* Rfer update part */
1630 if (cur_old_count == 0 && cur_new_count > 0) {
1631 qg->rfer += num_bytes;
1632 qg->rfer_cmpr += num_bytes;
1633 dirty = true;
1634 }
1635 if (cur_old_count > 0 && cur_new_count == 0) {
1636 qg->rfer -= num_bytes;
1637 qg->rfer_cmpr -= num_bytes;
1638 dirty = true;
1639 }
1640
1641 /* Excl update part */
1642 /* Exclusive/none -> shared case */
1643 if (cur_old_count == nr_old_roots &&
1644 cur_new_count < nr_new_roots) {
1645 /* Exclusive -> shared */
1646 if (cur_old_count != 0) {
1647 qg->excl -= num_bytes;
1648 qg->excl_cmpr -= num_bytes;
1649 dirty = true;
1650 }
1651 }
1652
1653 /* Shared -> exclusive/none case */
1654 if (cur_old_count < nr_old_roots &&
1655 cur_new_count == nr_new_roots) {
1656 /* Shared->exclusive */
1657 if (cur_new_count != 0) {
1658 qg->excl += num_bytes;
1659 qg->excl_cmpr += num_bytes;
1660 dirty = true;
1661 }
1662 }
1663
1664 /* Exclusive/none -> exclusive/none case */
1665 if (cur_old_count == nr_old_roots &&
1666 cur_new_count == nr_new_roots) {
1667 if (cur_old_count == 0) {
1668 /* None -> exclusive/none */
1669
1670 if (cur_new_count != 0) {
1671 /* None -> exclusive */
1672 qg->excl += num_bytes;
1673 qg->excl_cmpr += num_bytes;
1674 dirty = true;
1675 }
1676 /* None -> none, nothing changed */
1677 } else {
1678 /* Exclusive -> exclusive/none */
1679
1680 if (cur_new_count == 0) {
1681 /* Exclusive -> none */
1682 qg->excl -= num_bytes;
1683 qg->excl_cmpr -= num_bytes;
1684 dirty = true;
1685 }
1686 /* Exclusive -> exclusive, nothing changed */
1687 }
1688 }
1689
1690 if (dirty)
1691 qgroup_dirty(fs_info, qg);
1692 }
1693 return 0;
1694 }
1695
1696 int
1697 btrfs_qgroup_account_extent(struct btrfs_trans_handle *trans,
1698 struct btrfs_fs_info *fs_info,
1699 u64 bytenr, u64 num_bytes,
1700 struct ulist *old_roots, struct ulist *new_roots)
1701 {
1702 struct ulist *qgroups = NULL;
1703 struct ulist *tmp = NULL;
1704 u64 seq;
1705 u64 nr_new_roots = 0;
1706 u64 nr_old_roots = 0;
1707 int ret = 0;
1708
1709 if (new_roots)
1710 nr_new_roots = new_roots->nnodes;
1711 if (old_roots)
1712 nr_old_roots = old_roots->nnodes;
1713
1714 if (!test_bit(BTRFS_FS_QUOTA_ENABLED, &fs_info->flags))
1715 goto out_free;
1716 BUG_ON(!fs_info->quota_root);
1717
1718 trace_btrfs_qgroup_account_extent(fs_info, bytenr, num_bytes,
1719 nr_old_roots, nr_new_roots);
1720
1721 qgroups = ulist_alloc(GFP_NOFS);
1722 if (!qgroups) {
1723 ret = -ENOMEM;
1724 goto out_free;
1725 }
1726 tmp = ulist_alloc(GFP_NOFS);
1727 if (!tmp) {
1728 ret = -ENOMEM;
1729 goto out_free;
1730 }
1731
1732 mutex_lock(&fs_info->qgroup_rescan_lock);
1733 if (fs_info->qgroup_flags & BTRFS_QGROUP_STATUS_FLAG_RESCAN) {
1734 if (fs_info->qgroup_rescan_progress.objectid <= bytenr) {
1735 mutex_unlock(&fs_info->qgroup_rescan_lock);
1736 ret = 0;
1737 goto out_free;
1738 }
1739 }
1740 mutex_unlock(&fs_info->qgroup_rescan_lock);
1741
1742 spin_lock(&fs_info->qgroup_lock);
1743 seq = fs_info->qgroup_seq;
1744
1745 /* Update old refcnts using old_roots */
1746 ret = qgroup_update_refcnt(fs_info, old_roots, tmp, qgroups, seq,
1747 UPDATE_OLD);
1748 if (ret < 0)
1749 goto out;
1750
1751 /* Update new refcnts using new_roots */
1752 ret = qgroup_update_refcnt(fs_info, new_roots, tmp, qgroups, seq,
1753 UPDATE_NEW);
1754 if (ret < 0)
1755 goto out;
1756
1757 qgroup_update_counters(fs_info, qgroups, nr_old_roots, nr_new_roots,
1758 num_bytes, seq);
1759
1760 /*
1761 * Bump qgroup_seq to avoid seq overlap
1762 */
1763 fs_info->qgroup_seq += max(nr_old_roots, nr_new_roots) + 1;
1764 out:
1765 spin_unlock(&fs_info->qgroup_lock);
1766 out_free:
1767 ulist_free(tmp);
1768 ulist_free(qgroups);
1769 ulist_free(old_roots);
1770 ulist_free(new_roots);
1771 return ret;
1772 }
1773
1774 int btrfs_qgroup_account_extents(struct btrfs_trans_handle *trans,
1775 struct btrfs_fs_info *fs_info)
1776 {
1777 struct btrfs_qgroup_extent_record *record;
1778 struct btrfs_delayed_ref_root *delayed_refs;
1779 struct ulist *new_roots = NULL;
1780 struct rb_node *node;
1781 u64 qgroup_to_skip;
1782 int ret = 0;
1783
1784 delayed_refs = &trans->transaction->delayed_refs;
1785 qgroup_to_skip = delayed_refs->qgroup_to_skip;
1786 while ((node = rb_first(&delayed_refs->dirty_extent_root))) {
1787 record = rb_entry(node, struct btrfs_qgroup_extent_record,
1788 node);
1789
1790 trace_btrfs_qgroup_account_extents(fs_info, record);
1791
1792 if (!ret) {
1793 /*
1794 * Use (u64)-1 as time_seq to do special search, which
1795 * doesn't lock tree or delayed_refs and search current
1796 * root. It's safe inside commit_transaction().
1797 */
1798 ret = btrfs_find_all_roots(trans, fs_info,
1799 record->bytenr, (u64)-1, &new_roots);
1800 if (ret < 0)
1801 goto cleanup;
1802 if (qgroup_to_skip)
1803 ulist_del(new_roots, qgroup_to_skip, 0);
1804 ret = btrfs_qgroup_account_extent(trans, fs_info,
1805 record->bytenr, record->num_bytes,
1806 record->old_roots, new_roots);
1807 record->old_roots = NULL;
1808 new_roots = NULL;
1809 }
1810 cleanup:
1811 ulist_free(record->old_roots);
1812 ulist_free(new_roots);
1813 new_roots = NULL;
1814 rb_erase(node, &delayed_refs->dirty_extent_root);
1815 kfree(record);
1816
1817 }
1818 return ret;
1819 }
1820
1821 /*
1822 * called from commit_transaction. Writes all changed qgroups to disk.
1823 */
1824 int btrfs_run_qgroups(struct btrfs_trans_handle *trans,
1825 struct btrfs_fs_info *fs_info)
1826 {
1827 struct btrfs_root *quota_root = fs_info->quota_root;
1828 int ret = 0;
1829 int start_rescan_worker = 0;
1830
1831 if (!quota_root)
1832 goto out;
1833
1834 if (!test_bit(BTRFS_FS_QUOTA_ENABLED, &fs_info->flags) &&
1835 test_bit(BTRFS_FS_QUOTA_ENABLING, &fs_info->flags))
1836 start_rescan_worker = 1;
1837
1838 if (test_and_clear_bit(BTRFS_FS_QUOTA_ENABLING, &fs_info->flags))
1839 set_bit(BTRFS_FS_QUOTA_ENABLED, &fs_info->flags);
1840 if (test_and_clear_bit(BTRFS_FS_QUOTA_DISABLING, &fs_info->flags))
1841 clear_bit(BTRFS_FS_QUOTA_ENABLED, &fs_info->flags);
1842
1843 spin_lock(&fs_info->qgroup_lock);
1844 while (!list_empty(&fs_info->dirty_qgroups)) {
1845 struct btrfs_qgroup *qgroup;
1846 qgroup = list_first_entry(&fs_info->dirty_qgroups,
1847 struct btrfs_qgroup, dirty);
1848 list_del_init(&qgroup->dirty);
1849 spin_unlock(&fs_info->qgroup_lock);
1850 ret = update_qgroup_info_item(trans, quota_root, qgroup);
1851 if (ret)
1852 fs_info->qgroup_flags |=
1853 BTRFS_QGROUP_STATUS_FLAG_INCONSISTENT;
1854 ret = update_qgroup_limit_item(trans, quota_root, qgroup);
1855 if (ret)
1856 fs_info->qgroup_flags |=
1857 BTRFS_QGROUP_STATUS_FLAG_INCONSISTENT;
1858 spin_lock(&fs_info->qgroup_lock);
1859 }
1860 if (test_bit(BTRFS_FS_QUOTA_ENABLED, &fs_info->flags))
1861 fs_info->qgroup_flags |= BTRFS_QGROUP_STATUS_FLAG_ON;
1862 else
1863 fs_info->qgroup_flags &= ~BTRFS_QGROUP_STATUS_FLAG_ON;
1864 spin_unlock(&fs_info->qgroup_lock);
1865
1866 ret = update_qgroup_status_item(trans, fs_info, quota_root);
1867 if (ret)
1868 fs_info->qgroup_flags |= BTRFS_QGROUP_STATUS_FLAG_INCONSISTENT;
1869
1870 if (!ret && start_rescan_worker) {
1871 ret = qgroup_rescan_init(fs_info, 0, 1);
1872 if (!ret) {
1873 qgroup_rescan_zero_tracking(fs_info);
1874 btrfs_queue_work(fs_info->qgroup_rescan_workers,
1875 &fs_info->qgroup_rescan_work);
1876 }
1877 ret = 0;
1878 }
1879
1880 out:
1881
1882 return ret;
1883 }
1884
1885 /*
1886 * Copy the accounting information between qgroups. This is necessary
1887 * when a snapshot or a subvolume is created. Throwing an error will
1888 * cause a transaction abort so we take extra care here to only error
1889 * when a readonly fs is a reasonable outcome.
1890 */
1891 int btrfs_qgroup_inherit(struct btrfs_trans_handle *trans,
1892 struct btrfs_fs_info *fs_info, u64 srcid, u64 objectid,
1893 struct btrfs_qgroup_inherit *inherit)
1894 {
1895 int ret = 0;
1896 int i;
1897 u64 *i_qgroups;
1898 struct btrfs_root *quota_root = fs_info->quota_root;
1899 struct btrfs_qgroup *srcgroup;
1900 struct btrfs_qgroup *dstgroup;
1901 u32 level_size = 0;
1902 u64 nums;
1903
1904 mutex_lock(&fs_info->qgroup_ioctl_lock);
1905 if (!test_bit(BTRFS_FS_QUOTA_ENABLED, &fs_info->flags))
1906 goto out;
1907
1908 if (!quota_root) {
1909 ret = -EINVAL;
1910 goto out;
1911 }
1912
1913 if (inherit) {
1914 i_qgroups = (u64 *)(inherit + 1);
1915 nums = inherit->num_qgroups + 2 * inherit->num_ref_copies +
1916 2 * inherit->num_excl_copies;
1917 for (i = 0; i < nums; ++i) {
1918 srcgroup = find_qgroup_rb(fs_info, *i_qgroups);
1919
1920 /*
1921 * Zero out invalid groups so we can ignore
1922 * them later.
1923 */
1924 if (!srcgroup ||
1925 ((srcgroup->qgroupid >> 48) <= (objectid >> 48)))
1926 *i_qgroups = 0ULL;
1927
1928 ++i_qgroups;
1929 }
1930 }
1931
1932 /*
1933 * create a tracking group for the subvol itself
1934 */
1935 ret = add_qgroup_item(trans, quota_root, objectid);
1936 if (ret)
1937 goto out;
1938
1939 if (srcid) {
1940 struct btrfs_root *srcroot;
1941 struct btrfs_key srckey;
1942
1943 srckey.objectid = srcid;
1944 srckey.type = BTRFS_ROOT_ITEM_KEY;
1945 srckey.offset = (u64)-1;
1946 srcroot = btrfs_read_fs_root_no_name(fs_info, &srckey);
1947 if (IS_ERR(srcroot)) {
1948 ret = PTR_ERR(srcroot);
1949 goto out;
1950 }
1951
1952 rcu_read_lock();
1953 level_size = srcroot->nodesize;
1954 rcu_read_unlock();
1955 }
1956
1957 /*
1958 * add qgroup to all inherited groups
1959 */
1960 if (inherit) {
1961 i_qgroups = (u64 *)(inherit + 1);
1962 for (i = 0; i < inherit->num_qgroups; ++i, ++i_qgroups) {
1963 if (*i_qgroups == 0)
1964 continue;
1965 ret = add_qgroup_relation_item(trans, quota_root,
1966 objectid, *i_qgroups);
1967 if (ret && ret != -EEXIST)
1968 goto out;
1969 ret = add_qgroup_relation_item(trans, quota_root,
1970 *i_qgroups, objectid);
1971 if (ret && ret != -EEXIST)
1972 goto out;
1973 }
1974 ret = 0;
1975 }
1976
1977
1978 spin_lock(&fs_info->qgroup_lock);
1979
1980 dstgroup = add_qgroup_rb(fs_info, objectid);
1981 if (IS_ERR(dstgroup)) {
1982 ret = PTR_ERR(dstgroup);
1983 goto unlock;
1984 }
1985
1986 if (inherit && inherit->flags & BTRFS_QGROUP_INHERIT_SET_LIMITS) {
1987 dstgroup->lim_flags = inherit->lim.flags;
1988 dstgroup->max_rfer = inherit->lim.max_rfer;
1989 dstgroup->max_excl = inherit->lim.max_excl;
1990 dstgroup->rsv_rfer = inherit->lim.rsv_rfer;
1991 dstgroup->rsv_excl = inherit->lim.rsv_excl;
1992
1993 ret = update_qgroup_limit_item(trans, quota_root, dstgroup);
1994 if (ret) {
1995 fs_info->qgroup_flags |= BTRFS_QGROUP_STATUS_FLAG_INCONSISTENT;
1996 btrfs_info(fs_info,
1997 "unable to update quota limit for %llu",
1998 dstgroup->qgroupid);
1999 goto unlock;
2000 }
2001 }
2002
2003 if (srcid) {
2004 srcgroup = find_qgroup_rb(fs_info, srcid);
2005 if (!srcgroup)
2006 goto unlock;
2007
2008 /*
2009 * We call inherit after we clone the root in order to make sure
2010 * our counts don't go crazy, so at this point the only
2011 * difference between the two roots should be the root node.
2012 */
2013 dstgroup->rfer = srcgroup->rfer;
2014 dstgroup->rfer_cmpr = srcgroup->rfer_cmpr;
2015 dstgroup->excl = level_size;
2016 dstgroup->excl_cmpr = level_size;
2017 srcgroup->excl = level_size;
2018 srcgroup->excl_cmpr = level_size;
2019
2020 /* inherit the limit info */
2021 dstgroup->lim_flags = srcgroup->lim_flags;
2022 dstgroup->max_rfer = srcgroup->max_rfer;
2023 dstgroup->max_excl = srcgroup->max_excl;
2024 dstgroup->rsv_rfer = srcgroup->rsv_rfer;
2025 dstgroup->rsv_excl = srcgroup->rsv_excl;
2026
2027 qgroup_dirty(fs_info, dstgroup);
2028 qgroup_dirty(fs_info, srcgroup);
2029 }
2030
2031 if (!inherit)
2032 goto unlock;
2033
2034 i_qgroups = (u64 *)(inherit + 1);
2035 for (i = 0; i < inherit->num_qgroups; ++i) {
2036 if (*i_qgroups) {
2037 ret = add_relation_rb(quota_root->fs_info, objectid,
2038 *i_qgroups);
2039 if (ret)
2040 goto unlock;
2041 }
2042 ++i_qgroups;
2043 }
2044
2045 for (i = 0; i < inherit->num_ref_copies; ++i, i_qgroups += 2) {
2046 struct btrfs_qgroup *src;
2047 struct btrfs_qgroup *dst;
2048
2049 if (!i_qgroups[0] || !i_qgroups[1])
2050 continue;
2051
2052 src = find_qgroup_rb(fs_info, i_qgroups[0]);
2053 dst = find_qgroup_rb(fs_info, i_qgroups[1]);
2054
2055 if (!src || !dst) {
2056 ret = -EINVAL;
2057 goto unlock;
2058 }
2059
2060 dst->rfer = src->rfer - level_size;
2061 dst->rfer_cmpr = src->rfer_cmpr - level_size;
2062 }
2063 for (i = 0; i < inherit->num_excl_copies; ++i, i_qgroups += 2) {
2064 struct btrfs_qgroup *src;
2065 struct btrfs_qgroup *dst;
2066
2067 if (!i_qgroups[0] || !i_qgroups[1])
2068 continue;
2069
2070 src = find_qgroup_rb(fs_info, i_qgroups[0]);
2071 dst = find_qgroup_rb(fs_info, i_qgroups[1]);
2072
2073 if (!src || !dst) {
2074 ret = -EINVAL;
2075 goto unlock;
2076 }
2077
2078 dst->excl = src->excl + level_size;
2079 dst->excl_cmpr = src->excl_cmpr + level_size;
2080 }
2081
2082 unlock:
2083 spin_unlock(&fs_info->qgroup_lock);
2084 out:
2085 mutex_unlock(&fs_info->qgroup_ioctl_lock);
2086 return ret;
2087 }
2088
2089 static int qgroup_reserve(struct btrfs_root *root, u64 num_bytes)
2090 {
2091 struct btrfs_root *quota_root;
2092 struct btrfs_qgroup *qgroup;
2093 struct btrfs_fs_info *fs_info = root->fs_info;
2094 u64 ref_root = root->root_key.objectid;
2095 int ret = 0;
2096 struct ulist_node *unode;
2097 struct ulist_iterator uiter;
2098
2099 if (!is_fstree(ref_root))
2100 return 0;
2101
2102 if (num_bytes == 0)
2103 return 0;
2104
2105 spin_lock(&fs_info->qgroup_lock);
2106 quota_root = fs_info->quota_root;
2107 if (!quota_root)
2108 goto out;
2109
2110 qgroup = find_qgroup_rb(fs_info, ref_root);
2111 if (!qgroup)
2112 goto out;
2113
2114 /*
2115 * in a first step, we check all affected qgroups if any limits would
2116 * be exceeded
2117 */
2118 ulist_reinit(fs_info->qgroup_ulist);
2119 ret = ulist_add(fs_info->qgroup_ulist, qgroup->qgroupid,
2120 (uintptr_t)qgroup, GFP_ATOMIC);
2121 if (ret < 0)
2122 goto out;
2123 ULIST_ITER_INIT(&uiter);
2124 while ((unode = ulist_next(fs_info->qgroup_ulist, &uiter))) {
2125 struct btrfs_qgroup *qg;
2126 struct btrfs_qgroup_list *glist;
2127
2128 qg = u64_to_ptr(unode->aux);
2129
2130 if ((qg->lim_flags & BTRFS_QGROUP_LIMIT_MAX_RFER) &&
2131 qg->reserved + (s64)qg->rfer + num_bytes >
2132 qg->max_rfer) {
2133 ret = -EDQUOT;
2134 goto out;
2135 }
2136
2137 if ((qg->lim_flags & BTRFS_QGROUP_LIMIT_MAX_EXCL) &&
2138 qg->reserved + (s64)qg->excl + num_bytes >
2139 qg->max_excl) {
2140 ret = -EDQUOT;
2141 goto out;
2142 }
2143
2144 list_for_each_entry(glist, &qg->groups, next_group) {
2145 ret = ulist_add(fs_info->qgroup_ulist,
2146 glist->group->qgroupid,
2147 (uintptr_t)glist->group, GFP_ATOMIC);
2148 if (ret < 0)
2149 goto out;
2150 }
2151 }
2152 ret = 0;
2153 /*
2154 * no limits exceeded, now record the reservation into all qgroups
2155 */
2156 ULIST_ITER_INIT(&uiter);
2157 while ((unode = ulist_next(fs_info->qgroup_ulist, &uiter))) {
2158 struct btrfs_qgroup *qg;
2159
2160 qg = u64_to_ptr(unode->aux);
2161
2162 qg->reserved += num_bytes;
2163 }
2164
2165 out:
2166 spin_unlock(&fs_info->qgroup_lock);
2167 return ret;
2168 }
2169
2170 void btrfs_qgroup_free_refroot(struct btrfs_fs_info *fs_info,
2171 u64 ref_root, u64 num_bytes)
2172 {
2173 struct btrfs_root *quota_root;
2174 struct btrfs_qgroup *qgroup;
2175 struct ulist_node *unode;
2176 struct ulist_iterator uiter;
2177 int ret = 0;
2178
2179 if (!is_fstree(ref_root))
2180 return;
2181
2182 if (num_bytes == 0)
2183 return;
2184
2185 spin_lock(&fs_info->qgroup_lock);
2186
2187 quota_root = fs_info->quota_root;
2188 if (!quota_root)
2189 goto out;
2190
2191 qgroup = find_qgroup_rb(fs_info, ref_root);
2192 if (!qgroup)
2193 goto out;
2194
2195 ulist_reinit(fs_info->qgroup_ulist);
2196 ret = ulist_add(fs_info->qgroup_ulist, qgroup->qgroupid,
2197 (uintptr_t)qgroup, GFP_ATOMIC);
2198 if (ret < 0)
2199 goto out;
2200 ULIST_ITER_INIT(&uiter);
2201 while ((unode = ulist_next(fs_info->qgroup_ulist, &uiter))) {
2202 struct btrfs_qgroup *qg;
2203 struct btrfs_qgroup_list *glist;
2204
2205 qg = u64_to_ptr(unode->aux);
2206
2207 qg->reserved -= num_bytes;
2208
2209 list_for_each_entry(glist, &qg->groups, next_group) {
2210 ret = ulist_add(fs_info->qgroup_ulist,
2211 glist->group->qgroupid,
2212 (uintptr_t)glist->group, GFP_ATOMIC);
2213 if (ret < 0)
2214 goto out;
2215 }
2216 }
2217
2218 out:
2219 spin_unlock(&fs_info->qgroup_lock);
2220 }
2221
2222 static inline void qgroup_free(struct btrfs_root *root, u64 num_bytes)
2223 {
2224 return btrfs_qgroup_free_refroot(root->fs_info, root->objectid,
2225 num_bytes);
2226 }
2227 void assert_qgroups_uptodate(struct btrfs_trans_handle *trans)
2228 {
2229 if (list_empty(&trans->qgroup_ref_list) && !trans->delayed_ref_elem.seq)
2230 return;
2231 btrfs_err(trans->fs_info,
2232 "qgroups not uptodate in trans handle %p: list is%s empty, seq is %#x.%x",
2233 trans, list_empty(&trans->qgroup_ref_list) ? "" : " not",
2234 (u32)(trans->delayed_ref_elem.seq >> 32),
2235 (u32)trans->delayed_ref_elem.seq);
2236 BUG();
2237 }
2238
2239 /*
2240 * returns < 0 on error, 0 when more leafs are to be scanned.
2241 * returns 1 when done.
2242 */
2243 static int
2244 qgroup_rescan_leaf(struct btrfs_fs_info *fs_info, struct btrfs_path *path,
2245 struct btrfs_trans_handle *trans)
2246 {
2247 struct btrfs_key found;
2248 struct extent_buffer *scratch_leaf = NULL;
2249 struct ulist *roots = NULL;
2250 struct seq_list tree_mod_seq_elem = SEQ_LIST_INIT(tree_mod_seq_elem);
2251 u64 num_bytes;
2252 int slot;
2253 int ret;
2254
2255 mutex_lock(&fs_info->qgroup_rescan_lock);
2256 ret = btrfs_search_slot_for_read(fs_info->extent_root,
2257 &fs_info->qgroup_rescan_progress,
2258 path, 1, 0);
2259
2260 btrfs_debug(fs_info,
2261 "current progress key (%llu %u %llu), search_slot ret %d",
2262 fs_info->qgroup_rescan_progress.objectid,
2263 fs_info->qgroup_rescan_progress.type,
2264 fs_info->qgroup_rescan_progress.offset, ret);
2265
2266 if (ret) {
2267 /*
2268 * The rescan is about to end, we will not be scanning any
2269 * further blocks. We cannot unset the RESCAN flag here, because
2270 * we want to commit the transaction if everything went well.
2271 * To make the live accounting work in this phase, we set our
2272 * scan progress pointer such that every real extent objectid
2273 * will be smaller.
2274 */
2275 fs_info->qgroup_rescan_progress.objectid = (u64)-1;
2276 btrfs_release_path(path);
2277 mutex_unlock(&fs_info->qgroup_rescan_lock);
2278 return ret;
2279 }
2280
2281 btrfs_item_key_to_cpu(path->nodes[0], &found,
2282 btrfs_header_nritems(path->nodes[0]) - 1);
2283 fs_info->qgroup_rescan_progress.objectid = found.objectid + 1;
2284
2285 btrfs_get_tree_mod_seq(fs_info, &tree_mod_seq_elem);
2286 scratch_leaf = btrfs_clone_extent_buffer(path->nodes[0]);
2287 if (!scratch_leaf) {
2288 ret = -ENOMEM;
2289 mutex_unlock(&fs_info->qgroup_rescan_lock);
2290 goto out;
2291 }
2292 extent_buffer_get(scratch_leaf);
2293 btrfs_tree_read_lock(scratch_leaf);
2294 btrfs_set_lock_blocking_rw(scratch_leaf, BTRFS_READ_LOCK);
2295 slot = path->slots[0];
2296 btrfs_release_path(path);
2297 mutex_unlock(&fs_info->qgroup_rescan_lock);
2298
2299 for (; slot < btrfs_header_nritems(scratch_leaf); ++slot) {
2300 btrfs_item_key_to_cpu(scratch_leaf, &found, slot);
2301 if (found.type != BTRFS_EXTENT_ITEM_KEY &&
2302 found.type != BTRFS_METADATA_ITEM_KEY)
2303 continue;
2304 if (found.type == BTRFS_METADATA_ITEM_KEY)
2305 num_bytes = fs_info->extent_root->nodesize;
2306 else
2307 num_bytes = found.offset;
2308
2309 ret = btrfs_find_all_roots(NULL, fs_info, found.objectid, 0,
2310 &roots);
2311 if (ret < 0)
2312 goto out;
2313 /* For rescan, just pass old_roots as NULL */
2314 ret = btrfs_qgroup_account_extent(trans, fs_info,
2315 found.objectid, num_bytes, NULL, roots);
2316 if (ret < 0)
2317 goto out;
2318 }
2319 out:
2320 if (scratch_leaf) {
2321 btrfs_tree_read_unlock_blocking(scratch_leaf);
2322 free_extent_buffer(scratch_leaf);
2323 }
2324 btrfs_put_tree_mod_seq(fs_info, &tree_mod_seq_elem);
2325
2326 return ret;
2327 }
2328
2329 static void btrfs_qgroup_rescan_worker(struct btrfs_work *work)
2330 {
2331 struct btrfs_fs_info *fs_info = container_of(work, struct btrfs_fs_info,
2332 qgroup_rescan_work);
2333 struct btrfs_path *path;
2334 struct btrfs_trans_handle *trans = NULL;
2335 int err = -ENOMEM;
2336 int ret = 0;
2337
2338 mutex_lock(&fs_info->qgroup_rescan_lock);
2339 fs_info->qgroup_rescan_running = true;
2340 mutex_unlock(&fs_info->qgroup_rescan_lock);
2341
2342 path = btrfs_alloc_path();
2343 if (!path)
2344 goto out;
2345
2346 err = 0;
2347 while (!err && !btrfs_fs_closing(fs_info)) {
2348 trans = btrfs_start_transaction(fs_info->fs_root, 0);
2349 if (IS_ERR(trans)) {
2350 err = PTR_ERR(trans);
2351 break;
2352 }
2353 if (!test_bit(BTRFS_FS_QUOTA_ENABLED, &fs_info->flags)) {
2354 err = -EINTR;
2355 } else {
2356 err = qgroup_rescan_leaf(fs_info, path, trans);
2357 }
2358 if (err > 0)
2359 btrfs_commit_transaction(trans, fs_info->fs_root);
2360 else
2361 btrfs_end_transaction(trans, fs_info->fs_root);
2362 }
2363
2364 out:
2365 btrfs_free_path(path);
2366
2367 mutex_lock(&fs_info->qgroup_rescan_lock);
2368 if (!btrfs_fs_closing(fs_info))
2369 fs_info->qgroup_flags &= ~BTRFS_QGROUP_STATUS_FLAG_RESCAN;
2370
2371 if (err > 0 &&
2372 fs_info->qgroup_flags & BTRFS_QGROUP_STATUS_FLAG_INCONSISTENT) {
2373 fs_info->qgroup_flags &= ~BTRFS_QGROUP_STATUS_FLAG_INCONSISTENT;
2374 } else if (err < 0) {
2375 fs_info->qgroup_flags |= BTRFS_QGROUP_STATUS_FLAG_INCONSISTENT;
2376 }
2377 mutex_unlock(&fs_info->qgroup_rescan_lock);
2378
2379 /*
2380 * only update status, since the previous part has already updated the
2381 * qgroup info.
2382 */
2383 trans = btrfs_start_transaction(fs_info->quota_root, 1);
2384 if (IS_ERR(trans)) {
2385 err = PTR_ERR(trans);
2386 btrfs_err(fs_info,
2387 "fail to start transaction for status update: %d\n",
2388 err);
2389 goto done;
2390 }
2391 ret = update_qgroup_status_item(trans, fs_info, fs_info->quota_root);
2392 if (ret < 0) {
2393 err = ret;
2394 btrfs_err(fs_info, "fail to update qgroup status: %d", err);
2395 }
2396 btrfs_end_transaction(trans, fs_info->quota_root);
2397
2398 if (btrfs_fs_closing(fs_info)) {
2399 btrfs_info(fs_info, "qgroup scan paused");
2400 } else if (err >= 0) {
2401 btrfs_info(fs_info, "qgroup scan completed%s",
2402 err > 0 ? " (inconsistency flag cleared)" : "");
2403 } else {
2404 btrfs_err(fs_info, "qgroup scan failed with %d", err);
2405 }
2406
2407 done:
2408 mutex_lock(&fs_info->qgroup_rescan_lock);
2409 fs_info->qgroup_rescan_running = false;
2410 mutex_unlock(&fs_info->qgroup_rescan_lock);
2411 complete_all(&fs_info->qgroup_rescan_completion);
2412 }
2413
2414 /*
2415 * Checks that (a) no rescan is running and (b) quota is enabled. Allocates all
2416 * memory required for the rescan context.
2417 */
2418 static int
2419 qgroup_rescan_init(struct btrfs_fs_info *fs_info, u64 progress_objectid,
2420 int init_flags)
2421 {
2422 int ret = 0;
2423
2424 if (!init_flags &&
2425 (!(fs_info->qgroup_flags & BTRFS_QGROUP_STATUS_FLAG_RESCAN) ||
2426 !(fs_info->qgroup_flags & BTRFS_QGROUP_STATUS_FLAG_ON))) {
2427 ret = -EINVAL;
2428 goto err;
2429 }
2430
2431 mutex_lock(&fs_info->qgroup_rescan_lock);
2432 spin_lock(&fs_info->qgroup_lock);
2433
2434 if (init_flags) {
2435 if (fs_info->qgroup_flags & BTRFS_QGROUP_STATUS_FLAG_RESCAN)
2436 ret = -EINPROGRESS;
2437 else if (!(fs_info->qgroup_flags & BTRFS_QGROUP_STATUS_FLAG_ON))
2438 ret = -EINVAL;
2439
2440 if (ret) {
2441 spin_unlock(&fs_info->qgroup_lock);
2442 mutex_unlock(&fs_info->qgroup_rescan_lock);
2443 goto err;
2444 }
2445 fs_info->qgroup_flags |= BTRFS_QGROUP_STATUS_FLAG_RESCAN;
2446 }
2447
2448 memset(&fs_info->qgroup_rescan_progress, 0,
2449 sizeof(fs_info->qgroup_rescan_progress));
2450 fs_info->qgroup_rescan_progress.objectid = progress_objectid;
2451 init_completion(&fs_info->qgroup_rescan_completion);
2452
2453 spin_unlock(&fs_info->qgroup_lock);
2454 mutex_unlock(&fs_info->qgroup_rescan_lock);
2455
2456 memset(&fs_info->qgroup_rescan_work, 0,
2457 sizeof(fs_info->qgroup_rescan_work));
2458 btrfs_init_work(&fs_info->qgroup_rescan_work,
2459 btrfs_qgroup_rescan_helper,
2460 btrfs_qgroup_rescan_worker, NULL, NULL);
2461
2462 if (ret) {
2463 err:
2464 btrfs_info(fs_info, "qgroup_rescan_init failed with %d", ret);
2465 return ret;
2466 }
2467
2468 return 0;
2469 }
2470
2471 static void
2472 qgroup_rescan_zero_tracking(struct btrfs_fs_info *fs_info)
2473 {
2474 struct rb_node *n;
2475 struct btrfs_qgroup *qgroup;
2476
2477 spin_lock(&fs_info->qgroup_lock);
2478 /* clear all current qgroup tracking information */
2479 for (n = rb_first(&fs_info->qgroup_tree); n; n = rb_next(n)) {
2480 qgroup = rb_entry(n, struct btrfs_qgroup, node);
2481 qgroup->rfer = 0;
2482 qgroup->rfer_cmpr = 0;
2483 qgroup->excl = 0;
2484 qgroup->excl_cmpr = 0;
2485 }
2486 spin_unlock(&fs_info->qgroup_lock);
2487 }
2488
2489 int
2490 btrfs_qgroup_rescan(struct btrfs_fs_info *fs_info)
2491 {
2492 int ret = 0;
2493 struct btrfs_trans_handle *trans;
2494
2495 ret = qgroup_rescan_init(fs_info, 0, 1);
2496 if (ret)
2497 return ret;
2498
2499 /*
2500 * We have set the rescan_progress to 0, which means no more
2501 * delayed refs will be accounted by btrfs_qgroup_account_ref.
2502 * However, btrfs_qgroup_account_ref may be right after its call
2503 * to btrfs_find_all_roots, in which case it would still do the
2504 * accounting.
2505 * To solve this, we're committing the transaction, which will
2506 * ensure we run all delayed refs and only after that, we are
2507 * going to clear all tracking information for a clean start.
2508 */
2509
2510 trans = btrfs_join_transaction(fs_info->fs_root);
2511 if (IS_ERR(trans)) {
2512 fs_info->qgroup_flags &= ~BTRFS_QGROUP_STATUS_FLAG_RESCAN;
2513 return PTR_ERR(trans);
2514 }
2515 ret = btrfs_commit_transaction(trans, fs_info->fs_root);
2516 if (ret) {
2517 fs_info->qgroup_flags &= ~BTRFS_QGROUP_STATUS_FLAG_RESCAN;
2518 return ret;
2519 }
2520
2521 qgroup_rescan_zero_tracking(fs_info);
2522
2523 btrfs_queue_work(fs_info->qgroup_rescan_workers,
2524 &fs_info->qgroup_rescan_work);
2525
2526 return 0;
2527 }
2528
2529 int btrfs_qgroup_wait_for_completion(struct btrfs_fs_info *fs_info,
2530 bool interruptible)
2531 {
2532 int running;
2533 int ret = 0;
2534
2535 mutex_lock(&fs_info->qgroup_rescan_lock);
2536 spin_lock(&fs_info->qgroup_lock);
2537 running = fs_info->qgroup_rescan_running;
2538 spin_unlock(&fs_info->qgroup_lock);
2539 mutex_unlock(&fs_info->qgroup_rescan_lock);
2540
2541 if (!running)
2542 return 0;
2543
2544 if (interruptible)
2545 ret = wait_for_completion_interruptible(
2546 &fs_info->qgroup_rescan_completion);
2547 else
2548 wait_for_completion(&fs_info->qgroup_rescan_completion);
2549
2550 return ret;
2551 }
2552
2553 /*
2554 * this is only called from open_ctree where we're still single threaded, thus
2555 * locking is omitted here.
2556 */
2557 void
2558 btrfs_qgroup_rescan_resume(struct btrfs_fs_info *fs_info)
2559 {
2560 if (fs_info->qgroup_flags & BTRFS_QGROUP_STATUS_FLAG_RESCAN)
2561 btrfs_queue_work(fs_info->qgroup_rescan_workers,
2562 &fs_info->qgroup_rescan_work);
2563 }
2564
2565 /*
2566 * Reserve qgroup space for range [start, start + len).
2567 *
2568 * This function will either reserve space from related qgroups or doing
2569 * nothing if the range is already reserved.
2570 *
2571 * Return 0 for successful reserve
2572 * Return <0 for error (including -EQUOT)
2573 *
2574 * NOTE: this function may sleep for memory allocation.
2575 */
2576 int btrfs_qgroup_reserve_data(struct inode *inode, u64 start, u64 len)
2577 {
2578 struct btrfs_root *root = BTRFS_I(inode)->root;
2579 struct extent_changeset changeset;
2580 struct ulist_node *unode;
2581 struct ulist_iterator uiter;
2582 int ret;
2583
2584 if (!test_bit(BTRFS_FS_QUOTA_ENABLED, &root->fs_info->flags) ||
2585 !is_fstree(root->objectid) || len == 0)
2586 return 0;
2587
2588 changeset.bytes_changed = 0;
2589 changeset.range_changed = ulist_alloc(GFP_NOFS);
2590 ret = set_record_extent_bits(&BTRFS_I(inode)->io_tree, start,
2591 start + len -1, EXTENT_QGROUP_RESERVED, &changeset);
2592 trace_btrfs_qgroup_reserve_data(inode, start, len,
2593 changeset.bytes_changed,
2594 QGROUP_RESERVE);
2595 if (ret < 0)
2596 goto cleanup;
2597 ret = qgroup_reserve(root, changeset.bytes_changed);
2598 if (ret < 0)
2599 goto cleanup;
2600
2601 ulist_free(changeset.range_changed);
2602 return ret;
2603
2604 cleanup:
2605 /* cleanup already reserved ranges */
2606 ULIST_ITER_INIT(&uiter);
2607 while ((unode = ulist_next(changeset.range_changed, &uiter)))
2608 clear_extent_bit(&BTRFS_I(inode)->io_tree, unode->val,
2609 unode->aux, EXTENT_QGROUP_RESERVED, 0, 0, NULL,
2610 GFP_NOFS);
2611 ulist_free(changeset.range_changed);
2612 return ret;
2613 }
2614
2615 static int __btrfs_qgroup_release_data(struct inode *inode, u64 start, u64 len,
2616 int free)
2617 {
2618 struct extent_changeset changeset;
2619 int trace_op = QGROUP_RELEASE;
2620 int ret;
2621
2622 changeset.bytes_changed = 0;
2623 changeset.range_changed = ulist_alloc(GFP_NOFS);
2624 if (!changeset.range_changed)
2625 return -ENOMEM;
2626
2627 ret = clear_record_extent_bits(&BTRFS_I(inode)->io_tree, start,
2628 start + len -1, EXTENT_QGROUP_RESERVED, &changeset);
2629 if (ret < 0)
2630 goto out;
2631
2632 if (free) {
2633 qgroup_free(BTRFS_I(inode)->root, changeset.bytes_changed);
2634 trace_op = QGROUP_FREE;
2635 }
2636 trace_btrfs_qgroup_release_data(inode, start, len,
2637 changeset.bytes_changed, trace_op);
2638 out:
2639 ulist_free(changeset.range_changed);
2640 return ret;
2641 }
2642
2643 /*
2644 * Free a reserved space range from io_tree and related qgroups
2645 *
2646 * Should be called when a range of pages get invalidated before reaching disk.
2647 * Or for error cleanup case.
2648 *
2649 * For data written to disk, use btrfs_qgroup_release_data().
2650 *
2651 * NOTE: This function may sleep for memory allocation.
2652 */
2653 int btrfs_qgroup_free_data(struct inode *inode, u64 start, u64 len)
2654 {
2655 return __btrfs_qgroup_release_data(inode, start, len, 1);
2656 }
2657
2658 /*
2659 * Release a reserved space range from io_tree only.
2660 *
2661 * Should be called when a range of pages get written to disk and corresponding
2662 * FILE_EXTENT is inserted into corresponding root.
2663 *
2664 * Since new qgroup accounting framework will only update qgroup numbers at
2665 * commit_transaction() time, its reserved space shouldn't be freed from
2666 * related qgroups.
2667 *
2668 * But we should release the range from io_tree, to allow further write to be
2669 * COWed.
2670 *
2671 * NOTE: This function may sleep for memory allocation.
2672 */
2673 int btrfs_qgroup_release_data(struct inode *inode, u64 start, u64 len)
2674 {
2675 return __btrfs_qgroup_release_data(inode, start, len, 0);
2676 }
2677
2678 int btrfs_qgroup_reserve_meta(struct btrfs_root *root, int num_bytes)
2679 {
2680 int ret;
2681
2682 if (!test_bit(BTRFS_FS_QUOTA_ENABLED, &root->fs_info->flags) ||
2683 !is_fstree(root->objectid) || num_bytes == 0)
2684 return 0;
2685
2686 BUG_ON(num_bytes != round_down(num_bytes, root->nodesize));
2687 ret = qgroup_reserve(root, num_bytes);
2688 if (ret < 0)
2689 return ret;
2690 atomic_add(num_bytes, &root->qgroup_meta_rsv);
2691 return ret;
2692 }
2693
2694 void btrfs_qgroup_free_meta_all(struct btrfs_root *root)
2695 {
2696 int reserved;
2697
2698 if (!test_bit(BTRFS_FS_QUOTA_ENABLED, &root->fs_info->flags) ||
2699 !is_fstree(root->objectid))
2700 return;
2701
2702 reserved = atomic_xchg(&root->qgroup_meta_rsv, 0);
2703 if (reserved == 0)
2704 return;
2705 qgroup_free(root, reserved);
2706 }
2707
2708 void btrfs_qgroup_free_meta(struct btrfs_root *root, int num_bytes)
2709 {
2710 if (!test_bit(BTRFS_FS_QUOTA_ENABLED, &root->fs_info->flags) ||
2711 !is_fstree(root->objectid))
2712 return;
2713
2714 BUG_ON(num_bytes != round_down(num_bytes, root->nodesize));
2715 WARN_ON(atomic_read(&root->qgroup_meta_rsv) < num_bytes);
2716 atomic_sub(num_bytes, &root->qgroup_meta_rsv);
2717 qgroup_free(root, num_bytes);
2718 }
2719
2720 /*
2721 * Check qgroup reserved space leaking, normally at destroy inode
2722 * time
2723 */
2724 void btrfs_qgroup_check_reserved_leak(struct inode *inode)
2725 {
2726 struct extent_changeset changeset;
2727 struct ulist_node *unode;
2728 struct ulist_iterator iter;
2729 int ret;
2730
2731 changeset.bytes_changed = 0;
2732 changeset.range_changed = ulist_alloc(GFP_NOFS);
2733 if (WARN_ON(!changeset.range_changed))
2734 return;
2735
2736 ret = clear_record_extent_bits(&BTRFS_I(inode)->io_tree, 0, (u64)-1,
2737 EXTENT_QGROUP_RESERVED, &changeset);
2738
2739 WARN_ON(ret < 0);
2740 if (WARN_ON(changeset.bytes_changed)) {
2741 ULIST_ITER_INIT(&iter);
2742 while ((unode = ulist_next(changeset.range_changed, &iter))) {
2743 btrfs_warn(BTRFS_I(inode)->root->fs_info,
2744 "leaking qgroup reserved space, ino: %lu, start: %llu, end: %llu",
2745 inode->i_ino, unode->val, unode->aux);
2746 }
2747 qgroup_free(BTRFS_I(inode)->root, changeset.bytes_changed);
2748 }
2749 ulist_free(changeset.range_changed);
2750 }
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