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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 static void btrfs_qgroup_update_old_refcnt(struct btrfs_qgroup *qg, u64 seq,
51 int mod)
52 {
53 if (qg->old_refcnt < seq)
54 qg->old_refcnt = seq;
55 qg->old_refcnt += mod;
56 }
57
58 static void btrfs_qgroup_update_new_refcnt(struct btrfs_qgroup *qg, u64 seq,
59 int mod)
60 {
61 if (qg->new_refcnt < seq)
62 qg->new_refcnt = seq;
63 qg->new_refcnt += mod;
64 }
65
66 static inline u64 btrfs_qgroup_get_old_refcnt(struct btrfs_qgroup *qg, u64 seq)
67 {
68 if (qg->old_refcnt < seq)
69 return 0;
70 return qg->old_refcnt - seq;
71 }
72
73 static inline u64 btrfs_qgroup_get_new_refcnt(struct btrfs_qgroup *qg, u64 seq)
74 {
75 if (qg->new_refcnt < seq)
76 return 0;
77 return qg->new_refcnt - seq;
78 }
79
80 /*
81 * glue structure to represent the relations between qgroups.
82 */
83 struct btrfs_qgroup_list {
84 struct list_head next_group;
85 struct list_head next_member;
86 struct btrfs_qgroup *group;
87 struct btrfs_qgroup *member;
88 };
89
90 static inline u64 qgroup_to_aux(struct btrfs_qgroup *qg)
91 {
92 return (u64)(uintptr_t)qg;
93 }
94
95 static inline struct btrfs_qgroup* unode_aux_to_qgroup(struct ulist_node *n)
96 {
97 return (struct btrfs_qgroup *)(uintptr_t)n->aux;
98 }
99
100 static int
101 qgroup_rescan_init(struct btrfs_fs_info *fs_info, u64 progress_objectid,
102 int init_flags);
103 static void qgroup_rescan_zero_tracking(struct btrfs_fs_info *fs_info);
104
105 /* must be called with qgroup_ioctl_lock held */
106 static struct btrfs_qgroup *find_qgroup_rb(struct btrfs_fs_info *fs_info,
107 u64 qgroupid)
108 {
109 struct rb_node *n = fs_info->qgroup_tree.rb_node;
110 struct btrfs_qgroup *qgroup;
111
112 while (n) {
113 qgroup = rb_entry(n, struct btrfs_qgroup, node);
114 if (qgroup->qgroupid < qgroupid)
115 n = n->rb_left;
116 else if (qgroup->qgroupid > qgroupid)
117 n = n->rb_right;
118 else
119 return qgroup;
120 }
121 return NULL;
122 }
123
124 /* must be called with qgroup_lock held */
125 static struct btrfs_qgroup *add_qgroup_rb(struct btrfs_fs_info *fs_info,
126 u64 qgroupid)
127 {
128 struct rb_node **p = &fs_info->qgroup_tree.rb_node;
129 struct rb_node *parent = NULL;
130 struct btrfs_qgroup *qgroup;
131
132 while (*p) {
133 parent = *p;
134 qgroup = rb_entry(parent, struct btrfs_qgroup, node);
135
136 if (qgroup->qgroupid < qgroupid)
137 p = &(*p)->rb_left;
138 else if (qgroup->qgroupid > qgroupid)
139 p = &(*p)->rb_right;
140 else
141 return qgroup;
142 }
143
144 qgroup = kzalloc(sizeof(*qgroup), GFP_ATOMIC);
145 if (!qgroup)
146 return ERR_PTR(-ENOMEM);
147
148 qgroup->qgroupid = qgroupid;
149 INIT_LIST_HEAD(&qgroup->groups);
150 INIT_LIST_HEAD(&qgroup->members);
151 INIT_LIST_HEAD(&qgroup->dirty);
152
153 rb_link_node(&qgroup->node, parent, p);
154 rb_insert_color(&qgroup->node, &fs_info->qgroup_tree);
155
156 return qgroup;
157 }
158
159 static void __del_qgroup_rb(struct btrfs_qgroup *qgroup)
160 {
161 struct btrfs_qgroup_list *list;
162
163 list_del(&qgroup->dirty);
164 while (!list_empty(&qgroup->groups)) {
165 list = list_first_entry(&qgroup->groups,
166 struct btrfs_qgroup_list, next_group);
167 list_del(&list->next_group);
168 list_del(&list->next_member);
169 kfree(list);
170 }
171
172 while (!list_empty(&qgroup->members)) {
173 list = list_first_entry(&qgroup->members,
174 struct btrfs_qgroup_list, next_member);
175 list_del(&list->next_group);
176 list_del(&list->next_member);
177 kfree(list);
178 }
179 kfree(qgroup);
180 }
181
182 /* must be called with qgroup_lock held */
183 static int del_qgroup_rb(struct btrfs_fs_info *fs_info, u64 qgroupid)
184 {
185 struct btrfs_qgroup *qgroup = find_qgroup_rb(fs_info, qgroupid);
186
187 if (!qgroup)
188 return -ENOENT;
189
190 rb_erase(&qgroup->node, &fs_info->qgroup_tree);
191 __del_qgroup_rb(qgroup);
192 return 0;
193 }
194
195 /* must be called with qgroup_lock held */
196 static int add_relation_rb(struct btrfs_fs_info *fs_info,
197 u64 memberid, u64 parentid)
198 {
199 struct btrfs_qgroup *member;
200 struct btrfs_qgroup *parent;
201 struct btrfs_qgroup_list *list;
202
203 member = find_qgroup_rb(fs_info, memberid);
204 parent = find_qgroup_rb(fs_info, parentid);
205 if (!member || !parent)
206 return -ENOENT;
207
208 list = kzalloc(sizeof(*list), GFP_ATOMIC);
209 if (!list)
210 return -ENOMEM;
211
212 list->group = parent;
213 list->member = member;
214 list_add_tail(&list->next_group, &member->groups);
215 list_add_tail(&list->next_member, &parent->members);
216
217 return 0;
218 }
219
220 /* must be called with qgroup_lock held */
221 static int del_relation_rb(struct btrfs_fs_info *fs_info,
222 u64 memberid, u64 parentid)
223 {
224 struct btrfs_qgroup *member;
225 struct btrfs_qgroup *parent;
226 struct btrfs_qgroup_list *list;
227
228 member = find_qgroup_rb(fs_info, memberid);
229 parent = find_qgroup_rb(fs_info, parentid);
230 if (!member || !parent)
231 return -ENOENT;
232
233 list_for_each_entry(list, &member->groups, next_group) {
234 if (list->group == parent) {
235 list_del(&list->next_group);
236 list_del(&list->next_member);
237 kfree(list);
238 return 0;
239 }
240 }
241 return -ENOENT;
242 }
243
244 #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
245 int btrfs_verify_qgroup_counts(struct btrfs_fs_info *fs_info, u64 qgroupid,
246 u64 rfer, u64 excl)
247 {
248 struct btrfs_qgroup *qgroup;
249
250 qgroup = find_qgroup_rb(fs_info, qgroupid);
251 if (!qgroup)
252 return -EINVAL;
253 if (qgroup->rfer != rfer || qgroup->excl != excl)
254 return -EINVAL;
255 return 0;
256 }
257 #endif
258
259 /*
260 * The full config is read in one go, only called from open_ctree()
261 * It doesn't use any locking, as at this point we're still single-threaded
262 */
263 int btrfs_read_qgroup_config(struct btrfs_fs_info *fs_info)
264 {
265 struct btrfs_key key;
266 struct btrfs_key found_key;
267 struct btrfs_root *quota_root = fs_info->quota_root;
268 struct btrfs_path *path = NULL;
269 struct extent_buffer *l;
270 int slot;
271 int ret = 0;
272 u64 flags = 0;
273 u64 rescan_progress = 0;
274
275 if (!test_bit(BTRFS_FS_QUOTA_ENABLED, &fs_info->flags))
276 return 0;
277
278 fs_info->qgroup_ulist = ulist_alloc(GFP_KERNEL);
279 if (!fs_info->qgroup_ulist) {
280 ret = -ENOMEM;
281 goto out;
282 }
283
284 path = btrfs_alloc_path();
285 if (!path) {
286 ret = -ENOMEM;
287 goto out;
288 }
289
290 /* default this to quota off, in case no status key is found */
291 fs_info->qgroup_flags = 0;
292
293 /*
294 * pass 1: read status, all qgroup infos and limits
295 */
296 key.objectid = 0;
297 key.type = 0;
298 key.offset = 0;
299 ret = btrfs_search_slot_for_read(quota_root, &key, path, 1, 1);
300 if (ret)
301 goto out;
302
303 while (1) {
304 struct btrfs_qgroup *qgroup;
305
306 slot = path->slots[0];
307 l = path->nodes[0];
308 btrfs_item_key_to_cpu(l, &found_key, slot);
309
310 if (found_key.type == BTRFS_QGROUP_STATUS_KEY) {
311 struct btrfs_qgroup_status_item *ptr;
312
313 ptr = btrfs_item_ptr(l, slot,
314 struct btrfs_qgroup_status_item);
315
316 if (btrfs_qgroup_status_version(l, ptr) !=
317 BTRFS_QGROUP_STATUS_VERSION) {
318 btrfs_err(fs_info,
319 "old qgroup version, quota disabled");
320 goto out;
321 }
322 if (btrfs_qgroup_status_generation(l, ptr) !=
323 fs_info->generation) {
324 flags |= BTRFS_QGROUP_STATUS_FLAG_INCONSISTENT;
325 btrfs_err(fs_info,
326 "qgroup generation mismatch, marked as inconsistent");
327 }
328 fs_info->qgroup_flags = btrfs_qgroup_status_flags(l,
329 ptr);
330 rescan_progress = btrfs_qgroup_status_rescan(l, ptr);
331 goto next1;
332 }
333
334 if (found_key.type != BTRFS_QGROUP_INFO_KEY &&
335 found_key.type != BTRFS_QGROUP_LIMIT_KEY)
336 goto next1;
337
338 qgroup = find_qgroup_rb(fs_info, found_key.offset);
339 if ((qgroup && found_key.type == BTRFS_QGROUP_INFO_KEY) ||
340 (!qgroup && found_key.type == BTRFS_QGROUP_LIMIT_KEY)) {
341 btrfs_err(fs_info, "inconsistent qgroup config");
342 flags |= BTRFS_QGROUP_STATUS_FLAG_INCONSISTENT;
343 }
344 if (!qgroup) {
345 qgroup = add_qgroup_rb(fs_info, found_key.offset);
346 if (IS_ERR(qgroup)) {
347 ret = PTR_ERR(qgroup);
348 goto out;
349 }
350 }
351 switch (found_key.type) {
352 case BTRFS_QGROUP_INFO_KEY: {
353 struct btrfs_qgroup_info_item *ptr;
354
355 ptr = btrfs_item_ptr(l, slot,
356 struct btrfs_qgroup_info_item);
357 qgroup->rfer = btrfs_qgroup_info_rfer(l, ptr);
358 qgroup->rfer_cmpr = btrfs_qgroup_info_rfer_cmpr(l, ptr);
359 qgroup->excl = btrfs_qgroup_info_excl(l, ptr);
360 qgroup->excl_cmpr = btrfs_qgroup_info_excl_cmpr(l, ptr);
361 /* generation currently unused */
362 break;
363 }
364 case BTRFS_QGROUP_LIMIT_KEY: {
365 struct btrfs_qgroup_limit_item *ptr;
366
367 ptr = btrfs_item_ptr(l, slot,
368 struct btrfs_qgroup_limit_item);
369 qgroup->lim_flags = btrfs_qgroup_limit_flags(l, ptr);
370 qgroup->max_rfer = btrfs_qgroup_limit_max_rfer(l, ptr);
371 qgroup->max_excl = btrfs_qgroup_limit_max_excl(l, ptr);
372 qgroup->rsv_rfer = btrfs_qgroup_limit_rsv_rfer(l, ptr);
373 qgroup->rsv_excl = btrfs_qgroup_limit_rsv_excl(l, ptr);
374 break;
375 }
376 }
377 next1:
378 ret = btrfs_next_item(quota_root, path);
379 if (ret < 0)
380 goto out;
381 if (ret)
382 break;
383 }
384 btrfs_release_path(path);
385
386 /*
387 * pass 2: read all qgroup relations
388 */
389 key.objectid = 0;
390 key.type = BTRFS_QGROUP_RELATION_KEY;
391 key.offset = 0;
392 ret = btrfs_search_slot_for_read(quota_root, &key, path, 1, 0);
393 if (ret)
394 goto out;
395 while (1) {
396 slot = path->slots[0];
397 l = path->nodes[0];
398 btrfs_item_key_to_cpu(l, &found_key, slot);
399
400 if (found_key.type != BTRFS_QGROUP_RELATION_KEY)
401 goto next2;
402
403 if (found_key.objectid > found_key.offset) {
404 /* parent <- member, not needed to build config */
405 /* FIXME should we omit the key completely? */
406 goto next2;
407 }
408
409 ret = add_relation_rb(fs_info, found_key.objectid,
410 found_key.offset);
411 if (ret == -ENOENT) {
412 btrfs_warn(fs_info,
413 "orphan qgroup relation 0x%llx->0x%llx",
414 found_key.objectid, found_key.offset);
415 ret = 0; /* ignore the error */
416 }
417 if (ret)
418 goto out;
419 next2:
420 ret = btrfs_next_item(quota_root, path);
421 if (ret < 0)
422 goto out;
423 if (ret)
424 break;
425 }
426 out:
427 fs_info->qgroup_flags |= flags;
428 if (!(fs_info->qgroup_flags & BTRFS_QGROUP_STATUS_FLAG_ON))
429 clear_bit(BTRFS_FS_QUOTA_ENABLED, &fs_info->flags);
430 else if (fs_info->qgroup_flags & BTRFS_QGROUP_STATUS_FLAG_RESCAN &&
431 ret >= 0)
432 ret = qgroup_rescan_init(fs_info, rescan_progress, 0);
433 btrfs_free_path(path);
434
435 if (ret < 0) {
436 ulist_free(fs_info->qgroup_ulist);
437 fs_info->qgroup_ulist = NULL;
438 fs_info->qgroup_flags &= ~BTRFS_QGROUP_STATUS_FLAG_RESCAN;
439 }
440
441 return ret < 0 ? ret : 0;
442 }
443
444 /*
445 * This is called from close_ctree() or open_ctree() or btrfs_quota_disable(),
446 * first two are in single-threaded paths.And for the third one, we have set
447 * quota_root to be null with qgroup_lock held before, so it is safe to clean
448 * up the in-memory structures without qgroup_lock held.
449 */
450 void btrfs_free_qgroup_config(struct btrfs_fs_info *fs_info)
451 {
452 struct rb_node *n;
453 struct btrfs_qgroup *qgroup;
454
455 while ((n = rb_first(&fs_info->qgroup_tree))) {
456 qgroup = rb_entry(n, struct btrfs_qgroup, node);
457 rb_erase(n, &fs_info->qgroup_tree);
458 __del_qgroup_rb(qgroup);
459 }
460 /*
461 * we call btrfs_free_qgroup_config() when umounting
462 * filesystem and disabling quota, so we set qgroup_ulist
463 * to be null here to avoid double free.
464 */
465 ulist_free(fs_info->qgroup_ulist);
466 fs_info->qgroup_ulist = NULL;
467 }
468
469 static int add_qgroup_relation_item(struct btrfs_trans_handle *trans,
470 struct btrfs_root *quota_root,
471 u64 src, u64 dst)
472 {
473 int ret;
474 struct btrfs_path *path;
475 struct btrfs_key key;
476
477 path = btrfs_alloc_path();
478 if (!path)
479 return -ENOMEM;
480
481 key.objectid = src;
482 key.type = BTRFS_QGROUP_RELATION_KEY;
483 key.offset = dst;
484
485 ret = btrfs_insert_empty_item(trans, quota_root, path, &key, 0);
486
487 btrfs_mark_buffer_dirty(path->nodes[0]);
488
489 btrfs_free_path(path);
490 return ret;
491 }
492
493 static int del_qgroup_relation_item(struct btrfs_trans_handle *trans,
494 struct btrfs_root *quota_root,
495 u64 src, u64 dst)
496 {
497 int ret;
498 struct btrfs_path *path;
499 struct btrfs_key key;
500
501 path = btrfs_alloc_path();
502 if (!path)
503 return -ENOMEM;
504
505 key.objectid = src;
506 key.type = BTRFS_QGROUP_RELATION_KEY;
507 key.offset = dst;
508
509 ret = btrfs_search_slot(trans, quota_root, &key, path, -1, 1);
510 if (ret < 0)
511 goto out;
512
513 if (ret > 0) {
514 ret = -ENOENT;
515 goto out;
516 }
517
518 ret = btrfs_del_item(trans, quota_root, path);
519 out:
520 btrfs_free_path(path);
521 return ret;
522 }
523
524 static int add_qgroup_item(struct btrfs_trans_handle *trans,
525 struct btrfs_root *quota_root, u64 qgroupid)
526 {
527 int ret;
528 struct btrfs_path *path;
529 struct btrfs_qgroup_info_item *qgroup_info;
530 struct btrfs_qgroup_limit_item *qgroup_limit;
531 struct extent_buffer *leaf;
532 struct btrfs_key key;
533
534 if (btrfs_is_testing(quota_root->fs_info))
535 return 0;
536
537 path = btrfs_alloc_path();
538 if (!path)
539 return -ENOMEM;
540
541 key.objectid = 0;
542 key.type = BTRFS_QGROUP_INFO_KEY;
543 key.offset = qgroupid;
544
545 /*
546 * Avoid a transaction abort by catching -EEXIST here. In that
547 * case, we proceed by re-initializing the existing structure
548 * on disk.
549 */
550
551 ret = btrfs_insert_empty_item(trans, quota_root, path, &key,
552 sizeof(*qgroup_info));
553 if (ret && ret != -EEXIST)
554 goto out;
555
556 leaf = path->nodes[0];
557 qgroup_info = btrfs_item_ptr(leaf, path->slots[0],
558 struct btrfs_qgroup_info_item);
559 btrfs_set_qgroup_info_generation(leaf, qgroup_info, trans->transid);
560 btrfs_set_qgroup_info_rfer(leaf, qgroup_info, 0);
561 btrfs_set_qgroup_info_rfer_cmpr(leaf, qgroup_info, 0);
562 btrfs_set_qgroup_info_excl(leaf, qgroup_info, 0);
563 btrfs_set_qgroup_info_excl_cmpr(leaf, qgroup_info, 0);
564
565 btrfs_mark_buffer_dirty(leaf);
566
567 btrfs_release_path(path);
568
569 key.type = BTRFS_QGROUP_LIMIT_KEY;
570 ret = btrfs_insert_empty_item(trans, quota_root, path, &key,
571 sizeof(*qgroup_limit));
572 if (ret && ret != -EEXIST)
573 goto out;
574
575 leaf = path->nodes[0];
576 qgroup_limit = btrfs_item_ptr(leaf, path->slots[0],
577 struct btrfs_qgroup_limit_item);
578 btrfs_set_qgroup_limit_flags(leaf, qgroup_limit, 0);
579 btrfs_set_qgroup_limit_max_rfer(leaf, qgroup_limit, 0);
580 btrfs_set_qgroup_limit_max_excl(leaf, qgroup_limit, 0);
581 btrfs_set_qgroup_limit_rsv_rfer(leaf, qgroup_limit, 0);
582 btrfs_set_qgroup_limit_rsv_excl(leaf, qgroup_limit, 0);
583
584 btrfs_mark_buffer_dirty(leaf);
585
586 ret = 0;
587 out:
588 btrfs_free_path(path);
589 return ret;
590 }
591
592 static int del_qgroup_item(struct btrfs_trans_handle *trans,
593 struct btrfs_root *quota_root, u64 qgroupid)
594 {
595 int ret;
596 struct btrfs_path *path;
597 struct btrfs_key key;
598
599 path = btrfs_alloc_path();
600 if (!path)
601 return -ENOMEM;
602
603 key.objectid = 0;
604 key.type = BTRFS_QGROUP_INFO_KEY;
605 key.offset = qgroupid;
606 ret = btrfs_search_slot(trans, quota_root, &key, path, -1, 1);
607 if (ret < 0)
608 goto out;
609
610 if (ret > 0) {
611 ret = -ENOENT;
612 goto out;
613 }
614
615 ret = btrfs_del_item(trans, quota_root, path);
616 if (ret)
617 goto out;
618
619 btrfs_release_path(path);
620
621 key.type = BTRFS_QGROUP_LIMIT_KEY;
622 ret = btrfs_search_slot(trans, quota_root, &key, path, -1, 1);
623 if (ret < 0)
624 goto out;
625
626 if (ret > 0) {
627 ret = -ENOENT;
628 goto out;
629 }
630
631 ret = btrfs_del_item(trans, quota_root, path);
632
633 out:
634 btrfs_free_path(path);
635 return ret;
636 }
637
638 static int update_qgroup_limit_item(struct btrfs_trans_handle *trans,
639 struct btrfs_root *root,
640 struct btrfs_qgroup *qgroup)
641 {
642 struct btrfs_path *path;
643 struct btrfs_key key;
644 struct extent_buffer *l;
645 struct btrfs_qgroup_limit_item *qgroup_limit;
646 int ret;
647 int slot;
648
649 key.objectid = 0;
650 key.type = BTRFS_QGROUP_LIMIT_KEY;
651 key.offset = qgroup->qgroupid;
652
653 path = btrfs_alloc_path();
654 if (!path)
655 return -ENOMEM;
656
657 ret = btrfs_search_slot(trans, root, &key, path, 0, 1);
658 if (ret > 0)
659 ret = -ENOENT;
660
661 if (ret)
662 goto out;
663
664 l = path->nodes[0];
665 slot = path->slots[0];
666 qgroup_limit = btrfs_item_ptr(l, slot, struct btrfs_qgroup_limit_item);
667 btrfs_set_qgroup_limit_flags(l, qgroup_limit, qgroup->lim_flags);
668 btrfs_set_qgroup_limit_max_rfer(l, qgroup_limit, qgroup->max_rfer);
669 btrfs_set_qgroup_limit_max_excl(l, qgroup_limit, qgroup->max_excl);
670 btrfs_set_qgroup_limit_rsv_rfer(l, qgroup_limit, qgroup->rsv_rfer);
671 btrfs_set_qgroup_limit_rsv_excl(l, qgroup_limit, qgroup->rsv_excl);
672
673 btrfs_mark_buffer_dirty(l);
674
675 out:
676 btrfs_free_path(path);
677 return ret;
678 }
679
680 static int update_qgroup_info_item(struct btrfs_trans_handle *trans,
681 struct btrfs_root *root,
682 struct btrfs_qgroup *qgroup)
683 {
684 struct btrfs_path *path;
685 struct btrfs_key key;
686 struct extent_buffer *l;
687 struct btrfs_qgroup_info_item *qgroup_info;
688 int ret;
689 int slot;
690
691 if (btrfs_is_testing(root->fs_info))
692 return 0;
693
694 key.objectid = 0;
695 key.type = BTRFS_QGROUP_INFO_KEY;
696 key.offset = qgroup->qgroupid;
697
698 path = btrfs_alloc_path();
699 if (!path)
700 return -ENOMEM;
701
702 ret = btrfs_search_slot(trans, root, &key, path, 0, 1);
703 if (ret > 0)
704 ret = -ENOENT;
705
706 if (ret)
707 goto out;
708
709 l = path->nodes[0];
710 slot = path->slots[0];
711 qgroup_info = btrfs_item_ptr(l, slot, struct btrfs_qgroup_info_item);
712 btrfs_set_qgroup_info_generation(l, qgroup_info, trans->transid);
713 btrfs_set_qgroup_info_rfer(l, qgroup_info, qgroup->rfer);
714 btrfs_set_qgroup_info_rfer_cmpr(l, qgroup_info, qgroup->rfer_cmpr);
715 btrfs_set_qgroup_info_excl(l, qgroup_info, qgroup->excl);
716 btrfs_set_qgroup_info_excl_cmpr(l, qgroup_info, qgroup->excl_cmpr);
717
718 btrfs_mark_buffer_dirty(l);
719
720 out:
721 btrfs_free_path(path);
722 return ret;
723 }
724
725 static int update_qgroup_status_item(struct btrfs_trans_handle *trans,
726 struct btrfs_fs_info *fs_info,
727 struct btrfs_root *root)
728 {
729 struct btrfs_path *path;
730 struct btrfs_key key;
731 struct extent_buffer *l;
732 struct btrfs_qgroup_status_item *ptr;
733 int ret;
734 int slot;
735
736 key.objectid = 0;
737 key.type = BTRFS_QGROUP_STATUS_KEY;
738 key.offset = 0;
739
740 path = btrfs_alloc_path();
741 if (!path)
742 return -ENOMEM;
743
744 ret = btrfs_search_slot(trans, root, &key, path, 0, 1);
745 if (ret > 0)
746 ret = -ENOENT;
747
748 if (ret)
749 goto out;
750
751 l = path->nodes[0];
752 slot = path->slots[0];
753 ptr = btrfs_item_ptr(l, slot, struct btrfs_qgroup_status_item);
754 btrfs_set_qgroup_status_flags(l, ptr, fs_info->qgroup_flags);
755 btrfs_set_qgroup_status_generation(l, ptr, trans->transid);
756 btrfs_set_qgroup_status_rescan(l, ptr,
757 fs_info->qgroup_rescan_progress.objectid);
758
759 btrfs_mark_buffer_dirty(l);
760
761 out:
762 btrfs_free_path(path);
763 return ret;
764 }
765
766 /*
767 * called with qgroup_lock held
768 */
769 static int btrfs_clean_quota_tree(struct btrfs_trans_handle *trans,
770 struct btrfs_root *root)
771 {
772 struct btrfs_path *path;
773 struct btrfs_key key;
774 struct extent_buffer *leaf = NULL;
775 int ret;
776 int nr = 0;
777
778 path = btrfs_alloc_path();
779 if (!path)
780 return -ENOMEM;
781
782 path->leave_spinning = 1;
783
784 key.objectid = 0;
785 key.offset = 0;
786 key.type = 0;
787
788 while (1) {
789 ret = btrfs_search_slot(trans, root, &key, path, -1, 1);
790 if (ret < 0)
791 goto out;
792 leaf = path->nodes[0];
793 nr = btrfs_header_nritems(leaf);
794 if (!nr)
795 break;
796 /*
797 * delete the leaf one by one
798 * since the whole tree is going
799 * to be deleted.
800 */
801 path->slots[0] = 0;
802 ret = btrfs_del_items(trans, root, path, 0, nr);
803 if (ret)
804 goto out;
805
806 btrfs_release_path(path);
807 }
808 ret = 0;
809 out:
810 btrfs_free_path(path);
811 return ret;
812 }
813
814 int btrfs_quota_enable(struct btrfs_trans_handle *trans,
815 struct btrfs_fs_info *fs_info)
816 {
817 struct btrfs_root *quota_root;
818 struct btrfs_root *tree_root = fs_info->tree_root;
819 struct btrfs_path *path = NULL;
820 struct btrfs_qgroup_status_item *ptr;
821 struct extent_buffer *leaf;
822 struct btrfs_key key;
823 struct btrfs_key found_key;
824 struct btrfs_qgroup *qgroup = NULL;
825 int ret = 0;
826 int slot;
827
828 mutex_lock(&fs_info->qgroup_ioctl_lock);
829 if (fs_info->quota_root) {
830 set_bit(BTRFS_FS_QUOTA_ENABLING, &fs_info->flags);
831 goto out;
832 }
833
834 fs_info->qgroup_ulist = ulist_alloc(GFP_KERNEL);
835 if (!fs_info->qgroup_ulist) {
836 ret = -ENOMEM;
837 goto out;
838 }
839
840 /*
841 * initially create the quota tree
842 */
843 quota_root = btrfs_create_tree(trans, fs_info,
844 BTRFS_QUOTA_TREE_OBJECTID);
845 if (IS_ERR(quota_root)) {
846 ret = PTR_ERR(quota_root);
847 goto out;
848 }
849
850 path = btrfs_alloc_path();
851 if (!path) {
852 ret = -ENOMEM;
853 goto out_free_root;
854 }
855
856 key.objectid = 0;
857 key.type = BTRFS_QGROUP_STATUS_KEY;
858 key.offset = 0;
859
860 ret = btrfs_insert_empty_item(trans, quota_root, path, &key,
861 sizeof(*ptr));
862 if (ret)
863 goto out_free_path;
864
865 leaf = path->nodes[0];
866 ptr = btrfs_item_ptr(leaf, path->slots[0],
867 struct btrfs_qgroup_status_item);
868 btrfs_set_qgroup_status_generation(leaf, ptr, trans->transid);
869 btrfs_set_qgroup_status_version(leaf, ptr, BTRFS_QGROUP_STATUS_VERSION);
870 fs_info->qgroup_flags = BTRFS_QGROUP_STATUS_FLAG_ON |
871 BTRFS_QGROUP_STATUS_FLAG_INCONSISTENT;
872 btrfs_set_qgroup_status_flags(leaf, ptr, fs_info->qgroup_flags);
873 btrfs_set_qgroup_status_rescan(leaf, ptr, 0);
874
875 btrfs_mark_buffer_dirty(leaf);
876
877 key.objectid = 0;
878 key.type = BTRFS_ROOT_REF_KEY;
879 key.offset = 0;
880
881 btrfs_release_path(path);
882 ret = btrfs_search_slot_for_read(tree_root, &key, path, 1, 0);
883 if (ret > 0)
884 goto out_add_root;
885 if (ret < 0)
886 goto out_free_path;
887
888
889 while (1) {
890 slot = path->slots[0];
891 leaf = path->nodes[0];
892 btrfs_item_key_to_cpu(leaf, &found_key, slot);
893
894 if (found_key.type == BTRFS_ROOT_REF_KEY) {
895 ret = add_qgroup_item(trans, quota_root,
896 found_key.offset);
897 if (ret)
898 goto out_free_path;
899
900 qgroup = add_qgroup_rb(fs_info, found_key.offset);
901 if (IS_ERR(qgroup)) {
902 ret = PTR_ERR(qgroup);
903 goto out_free_path;
904 }
905 }
906 ret = btrfs_next_item(tree_root, path);
907 if (ret < 0)
908 goto out_free_path;
909 if (ret)
910 break;
911 }
912
913 out_add_root:
914 btrfs_release_path(path);
915 ret = add_qgroup_item(trans, quota_root, BTRFS_FS_TREE_OBJECTID);
916 if (ret)
917 goto out_free_path;
918
919 qgroup = add_qgroup_rb(fs_info, BTRFS_FS_TREE_OBJECTID);
920 if (IS_ERR(qgroup)) {
921 ret = PTR_ERR(qgroup);
922 goto out_free_path;
923 }
924 spin_lock(&fs_info->qgroup_lock);
925 fs_info->quota_root = quota_root;
926 set_bit(BTRFS_FS_QUOTA_ENABLING, &fs_info->flags);
927 spin_unlock(&fs_info->qgroup_lock);
928 out_free_path:
929 btrfs_free_path(path);
930 out_free_root:
931 if (ret) {
932 free_extent_buffer(quota_root->node);
933 free_extent_buffer(quota_root->commit_root);
934 kfree(quota_root);
935 }
936 out:
937 if (ret) {
938 ulist_free(fs_info->qgroup_ulist);
939 fs_info->qgroup_ulist = NULL;
940 }
941 mutex_unlock(&fs_info->qgroup_ioctl_lock);
942 return ret;
943 }
944
945 int btrfs_quota_disable(struct btrfs_trans_handle *trans,
946 struct btrfs_fs_info *fs_info)
947 {
948 struct btrfs_root *quota_root;
949 int ret = 0;
950
951 mutex_lock(&fs_info->qgroup_ioctl_lock);
952 if (!fs_info->quota_root)
953 goto out;
954 clear_bit(BTRFS_FS_QUOTA_ENABLED, &fs_info->flags);
955 btrfs_qgroup_wait_for_completion(fs_info, false);
956 spin_lock(&fs_info->qgroup_lock);
957 quota_root = fs_info->quota_root;
958 fs_info->quota_root = NULL;
959 fs_info->qgroup_flags &= ~BTRFS_QGROUP_STATUS_FLAG_ON;
960 spin_unlock(&fs_info->qgroup_lock);
961
962 btrfs_free_qgroup_config(fs_info);
963
964 ret = btrfs_clean_quota_tree(trans, quota_root);
965 if (ret)
966 goto out;
967
968 ret = btrfs_del_root(trans, fs_info, &quota_root->root_key);
969 if (ret)
970 goto out;
971
972 list_del(&quota_root->dirty_list);
973
974 btrfs_tree_lock(quota_root->node);
975 clean_tree_block(fs_info, quota_root->node);
976 btrfs_tree_unlock(quota_root->node);
977 btrfs_free_tree_block(trans, quota_root, quota_root->node, 0, 1);
978
979 free_extent_buffer(quota_root->node);
980 free_extent_buffer(quota_root->commit_root);
981 kfree(quota_root);
982 out:
983 mutex_unlock(&fs_info->qgroup_ioctl_lock);
984 return ret;
985 }
986
987 static void qgroup_dirty(struct btrfs_fs_info *fs_info,
988 struct btrfs_qgroup *qgroup)
989 {
990 if (list_empty(&qgroup->dirty))
991 list_add(&qgroup->dirty, &fs_info->dirty_qgroups);
992 }
993
994 static void report_reserved_underflow(struct btrfs_fs_info *fs_info,
995 struct btrfs_qgroup *qgroup,
996 u64 num_bytes)
997 {
998 #ifdef CONFIG_BTRFS_DEBUG
999 WARN_ON(qgroup->reserved < num_bytes);
1000 btrfs_debug(fs_info,
1001 "qgroup %llu reserved space underflow, have: %llu, to free: %llu",
1002 qgroup->qgroupid, qgroup->reserved, num_bytes);
1003 #endif
1004 qgroup->reserved = 0;
1005 }
1006 /*
1007 * The easy accounting, if we are adding/removing the only ref for an extent
1008 * then this qgroup and all of the parent qgroups get their reference and
1009 * exclusive counts adjusted.
1010 *
1011 * Caller should hold fs_info->qgroup_lock.
1012 */
1013 static int __qgroup_excl_accounting(struct btrfs_fs_info *fs_info,
1014 struct ulist *tmp, u64 ref_root,
1015 u64 num_bytes, int sign)
1016 {
1017 struct btrfs_qgroup *qgroup;
1018 struct btrfs_qgroup_list *glist;
1019 struct ulist_node *unode;
1020 struct ulist_iterator uiter;
1021 int ret = 0;
1022
1023 qgroup = find_qgroup_rb(fs_info, ref_root);
1024 if (!qgroup)
1025 goto out;
1026
1027 qgroup->rfer += sign * num_bytes;
1028 qgroup->rfer_cmpr += sign * num_bytes;
1029
1030 WARN_ON(sign < 0 && qgroup->excl < num_bytes);
1031 qgroup->excl += sign * num_bytes;
1032 qgroup->excl_cmpr += sign * num_bytes;
1033 if (sign > 0) {
1034 trace_qgroup_update_reserve(fs_info, qgroup, -(s64)num_bytes);
1035 if (qgroup->reserved < num_bytes)
1036 report_reserved_underflow(fs_info, qgroup, num_bytes);
1037 else
1038 qgroup->reserved -= num_bytes;
1039 }
1040
1041 qgroup_dirty(fs_info, qgroup);
1042
1043 /* Get all of the parent groups that contain this qgroup */
1044 list_for_each_entry(glist, &qgroup->groups, next_group) {
1045 ret = ulist_add(tmp, glist->group->qgroupid,
1046 qgroup_to_aux(glist->group), GFP_ATOMIC);
1047 if (ret < 0)
1048 goto out;
1049 }
1050
1051 /* Iterate all of the parents and adjust their reference counts */
1052 ULIST_ITER_INIT(&uiter);
1053 while ((unode = ulist_next(tmp, &uiter))) {
1054 qgroup = unode_aux_to_qgroup(unode);
1055 qgroup->rfer += sign * num_bytes;
1056 qgroup->rfer_cmpr += sign * num_bytes;
1057 WARN_ON(sign < 0 && qgroup->excl < num_bytes);
1058 qgroup->excl += sign * num_bytes;
1059 if (sign > 0) {
1060 trace_qgroup_update_reserve(fs_info, qgroup,
1061 -(s64)num_bytes);
1062 if (qgroup->reserved < num_bytes)
1063 report_reserved_underflow(fs_info, qgroup,
1064 num_bytes);
1065 else
1066 qgroup->reserved -= num_bytes;
1067 }
1068 qgroup->excl_cmpr += sign * num_bytes;
1069 qgroup_dirty(fs_info, qgroup);
1070
1071 /* Add any parents of the parents */
1072 list_for_each_entry(glist, &qgroup->groups, next_group) {
1073 ret = ulist_add(tmp, glist->group->qgroupid,
1074 qgroup_to_aux(glist->group), GFP_ATOMIC);
1075 if (ret < 0)
1076 goto out;
1077 }
1078 }
1079 ret = 0;
1080 out:
1081 return ret;
1082 }
1083
1084
1085 /*
1086 * Quick path for updating qgroup with only excl refs.
1087 *
1088 * In that case, just update all parent will be enough.
1089 * Or we needs to do a full rescan.
1090 * Caller should also hold fs_info->qgroup_lock.
1091 *
1092 * Return 0 for quick update, return >0 for need to full rescan
1093 * and mark INCONSISTENT flag.
1094 * Return < 0 for other error.
1095 */
1096 static int quick_update_accounting(struct btrfs_fs_info *fs_info,
1097 struct ulist *tmp, u64 src, u64 dst,
1098 int sign)
1099 {
1100 struct btrfs_qgroup *qgroup;
1101 int ret = 1;
1102 int err = 0;
1103
1104 qgroup = find_qgroup_rb(fs_info, src);
1105 if (!qgroup)
1106 goto out;
1107 if (qgroup->excl == qgroup->rfer) {
1108 ret = 0;
1109 err = __qgroup_excl_accounting(fs_info, tmp, dst,
1110 qgroup->excl, sign);
1111 if (err < 0) {
1112 ret = err;
1113 goto out;
1114 }
1115 }
1116 out:
1117 if (ret)
1118 fs_info->qgroup_flags |= BTRFS_QGROUP_STATUS_FLAG_INCONSISTENT;
1119 return ret;
1120 }
1121
1122 int btrfs_add_qgroup_relation(struct btrfs_trans_handle *trans,
1123 struct btrfs_fs_info *fs_info, u64 src, u64 dst)
1124 {
1125 struct btrfs_root *quota_root;
1126 struct btrfs_qgroup *parent;
1127 struct btrfs_qgroup *member;
1128 struct btrfs_qgroup_list *list;
1129 struct ulist *tmp;
1130 int ret = 0;
1131
1132 /* Check the level of src and dst first */
1133 if (btrfs_qgroup_level(src) >= btrfs_qgroup_level(dst))
1134 return -EINVAL;
1135
1136 tmp = ulist_alloc(GFP_KERNEL);
1137 if (!tmp)
1138 return -ENOMEM;
1139
1140 mutex_lock(&fs_info->qgroup_ioctl_lock);
1141 quota_root = fs_info->quota_root;
1142 if (!quota_root) {
1143 ret = -EINVAL;
1144 goto out;
1145 }
1146 member = find_qgroup_rb(fs_info, src);
1147 parent = find_qgroup_rb(fs_info, dst);
1148 if (!member || !parent) {
1149 ret = -EINVAL;
1150 goto out;
1151 }
1152
1153 /* check if such qgroup relation exist firstly */
1154 list_for_each_entry(list, &member->groups, next_group) {
1155 if (list->group == parent) {
1156 ret = -EEXIST;
1157 goto out;
1158 }
1159 }
1160
1161 ret = add_qgroup_relation_item(trans, quota_root, src, dst);
1162 if (ret)
1163 goto out;
1164
1165 ret = add_qgroup_relation_item(trans, quota_root, dst, src);
1166 if (ret) {
1167 del_qgroup_relation_item(trans, quota_root, src, dst);
1168 goto out;
1169 }
1170
1171 spin_lock(&fs_info->qgroup_lock);
1172 ret = add_relation_rb(fs_info, src, dst);
1173 if (ret < 0) {
1174 spin_unlock(&fs_info->qgroup_lock);
1175 goto out;
1176 }
1177 ret = quick_update_accounting(fs_info, tmp, src, dst, 1);
1178 spin_unlock(&fs_info->qgroup_lock);
1179 out:
1180 mutex_unlock(&fs_info->qgroup_ioctl_lock);
1181 ulist_free(tmp);
1182 return ret;
1183 }
1184
1185 static int __del_qgroup_relation(struct btrfs_trans_handle *trans,
1186 struct btrfs_fs_info *fs_info, u64 src, u64 dst)
1187 {
1188 struct btrfs_root *quota_root;
1189 struct btrfs_qgroup *parent;
1190 struct btrfs_qgroup *member;
1191 struct btrfs_qgroup_list *list;
1192 struct ulist *tmp;
1193 int ret = 0;
1194 int err;
1195
1196 tmp = ulist_alloc(GFP_KERNEL);
1197 if (!tmp)
1198 return -ENOMEM;
1199
1200 quota_root = fs_info->quota_root;
1201 if (!quota_root) {
1202 ret = -EINVAL;
1203 goto out;
1204 }
1205
1206 member = find_qgroup_rb(fs_info, src);
1207 parent = find_qgroup_rb(fs_info, dst);
1208 if (!member || !parent) {
1209 ret = -EINVAL;
1210 goto out;
1211 }
1212
1213 /* check if such qgroup relation exist firstly */
1214 list_for_each_entry(list, &member->groups, next_group) {
1215 if (list->group == parent)
1216 goto exist;
1217 }
1218 ret = -ENOENT;
1219 goto out;
1220 exist:
1221 ret = del_qgroup_relation_item(trans, quota_root, src, dst);
1222 err = del_qgroup_relation_item(trans, quota_root, dst, src);
1223 if (err && !ret)
1224 ret = err;
1225
1226 spin_lock(&fs_info->qgroup_lock);
1227 del_relation_rb(fs_info, src, dst);
1228 ret = quick_update_accounting(fs_info, tmp, src, dst, -1);
1229 spin_unlock(&fs_info->qgroup_lock);
1230 out:
1231 ulist_free(tmp);
1232 return ret;
1233 }
1234
1235 int btrfs_del_qgroup_relation(struct btrfs_trans_handle *trans,
1236 struct btrfs_fs_info *fs_info, u64 src, u64 dst)
1237 {
1238 int ret = 0;
1239
1240 mutex_lock(&fs_info->qgroup_ioctl_lock);
1241 ret = __del_qgroup_relation(trans, fs_info, src, dst);
1242 mutex_unlock(&fs_info->qgroup_ioctl_lock);
1243
1244 return ret;
1245 }
1246
1247 int btrfs_create_qgroup(struct btrfs_trans_handle *trans,
1248 struct btrfs_fs_info *fs_info, u64 qgroupid)
1249 {
1250 struct btrfs_root *quota_root;
1251 struct btrfs_qgroup *qgroup;
1252 int ret = 0;
1253
1254 mutex_lock(&fs_info->qgroup_ioctl_lock);
1255 quota_root = fs_info->quota_root;
1256 if (!quota_root) {
1257 ret = -EINVAL;
1258 goto out;
1259 }
1260 qgroup = find_qgroup_rb(fs_info, qgroupid);
1261 if (qgroup) {
1262 ret = -EEXIST;
1263 goto out;
1264 }
1265
1266 ret = add_qgroup_item(trans, quota_root, qgroupid);
1267 if (ret)
1268 goto out;
1269
1270 spin_lock(&fs_info->qgroup_lock);
1271 qgroup = add_qgroup_rb(fs_info, qgroupid);
1272 spin_unlock(&fs_info->qgroup_lock);
1273
1274 if (IS_ERR(qgroup))
1275 ret = PTR_ERR(qgroup);
1276 out:
1277 mutex_unlock(&fs_info->qgroup_ioctl_lock);
1278 return ret;
1279 }
1280
1281 int btrfs_remove_qgroup(struct btrfs_trans_handle *trans,
1282 struct btrfs_fs_info *fs_info, u64 qgroupid)
1283 {
1284 struct btrfs_root *quota_root;
1285 struct btrfs_qgroup *qgroup;
1286 struct btrfs_qgroup_list *list;
1287 int ret = 0;
1288
1289 mutex_lock(&fs_info->qgroup_ioctl_lock);
1290 quota_root = fs_info->quota_root;
1291 if (!quota_root) {
1292 ret = -EINVAL;
1293 goto out;
1294 }
1295
1296 qgroup = find_qgroup_rb(fs_info, qgroupid);
1297 if (!qgroup) {
1298 ret = -ENOENT;
1299 goto out;
1300 } else {
1301 /* check if there are no children of this qgroup */
1302 if (!list_empty(&qgroup->members)) {
1303 ret = -EBUSY;
1304 goto out;
1305 }
1306 }
1307 ret = del_qgroup_item(trans, quota_root, qgroupid);
1308 if (ret && ret != -ENOENT)
1309 goto out;
1310
1311 while (!list_empty(&qgroup->groups)) {
1312 list = list_first_entry(&qgroup->groups,
1313 struct btrfs_qgroup_list, next_group);
1314 ret = __del_qgroup_relation(trans, fs_info,
1315 qgroupid,
1316 list->group->qgroupid);
1317 if (ret)
1318 goto out;
1319 }
1320
1321 spin_lock(&fs_info->qgroup_lock);
1322 del_qgroup_rb(fs_info, qgroupid);
1323 spin_unlock(&fs_info->qgroup_lock);
1324 out:
1325 mutex_unlock(&fs_info->qgroup_ioctl_lock);
1326 return ret;
1327 }
1328
1329 int btrfs_limit_qgroup(struct btrfs_trans_handle *trans,
1330 struct btrfs_fs_info *fs_info, u64 qgroupid,
1331 struct btrfs_qgroup_limit *limit)
1332 {
1333 struct btrfs_root *quota_root;
1334 struct btrfs_qgroup *qgroup;
1335 int ret = 0;
1336 /* Sometimes we would want to clear the limit on this qgroup.
1337 * To meet this requirement, we treat the -1 as a special value
1338 * which tell kernel to clear the limit on this qgroup.
1339 */
1340 const u64 CLEAR_VALUE = -1;
1341
1342 mutex_lock(&fs_info->qgroup_ioctl_lock);
1343 quota_root = fs_info->quota_root;
1344 if (!quota_root) {
1345 ret = -EINVAL;
1346 goto out;
1347 }
1348
1349 qgroup = find_qgroup_rb(fs_info, qgroupid);
1350 if (!qgroup) {
1351 ret = -ENOENT;
1352 goto out;
1353 }
1354
1355 spin_lock(&fs_info->qgroup_lock);
1356 if (limit->flags & BTRFS_QGROUP_LIMIT_MAX_RFER) {
1357 if (limit->max_rfer == CLEAR_VALUE) {
1358 qgroup->lim_flags &= ~BTRFS_QGROUP_LIMIT_MAX_RFER;
1359 limit->flags &= ~BTRFS_QGROUP_LIMIT_MAX_RFER;
1360 qgroup->max_rfer = 0;
1361 } else {
1362 qgroup->max_rfer = limit->max_rfer;
1363 }
1364 }
1365 if (limit->flags & BTRFS_QGROUP_LIMIT_MAX_EXCL) {
1366 if (limit->max_excl == CLEAR_VALUE) {
1367 qgroup->lim_flags &= ~BTRFS_QGROUP_LIMIT_MAX_EXCL;
1368 limit->flags &= ~BTRFS_QGROUP_LIMIT_MAX_EXCL;
1369 qgroup->max_excl = 0;
1370 } else {
1371 qgroup->max_excl = limit->max_excl;
1372 }
1373 }
1374 if (limit->flags & BTRFS_QGROUP_LIMIT_RSV_RFER) {
1375 if (limit->rsv_rfer == CLEAR_VALUE) {
1376 qgroup->lim_flags &= ~BTRFS_QGROUP_LIMIT_RSV_RFER;
1377 limit->flags &= ~BTRFS_QGROUP_LIMIT_RSV_RFER;
1378 qgroup->rsv_rfer = 0;
1379 } else {
1380 qgroup->rsv_rfer = limit->rsv_rfer;
1381 }
1382 }
1383 if (limit->flags & BTRFS_QGROUP_LIMIT_RSV_EXCL) {
1384 if (limit->rsv_excl == CLEAR_VALUE) {
1385 qgroup->lim_flags &= ~BTRFS_QGROUP_LIMIT_RSV_EXCL;
1386 limit->flags &= ~BTRFS_QGROUP_LIMIT_RSV_EXCL;
1387 qgroup->rsv_excl = 0;
1388 } else {
1389 qgroup->rsv_excl = limit->rsv_excl;
1390 }
1391 }
1392 qgroup->lim_flags |= limit->flags;
1393
1394 spin_unlock(&fs_info->qgroup_lock);
1395
1396 ret = update_qgroup_limit_item(trans, quota_root, qgroup);
1397 if (ret) {
1398 fs_info->qgroup_flags |= BTRFS_QGROUP_STATUS_FLAG_INCONSISTENT;
1399 btrfs_info(fs_info, "unable to update quota limit for %llu",
1400 qgroupid);
1401 }
1402
1403 out:
1404 mutex_unlock(&fs_info->qgroup_ioctl_lock);
1405 return ret;
1406 }
1407
1408 int btrfs_qgroup_trace_extent_nolock(struct btrfs_fs_info *fs_info,
1409 struct btrfs_delayed_ref_root *delayed_refs,
1410 struct btrfs_qgroup_extent_record *record)
1411 {
1412 struct rb_node **p = &delayed_refs->dirty_extent_root.rb_node;
1413 struct rb_node *parent_node = NULL;
1414 struct btrfs_qgroup_extent_record *entry;
1415 u64 bytenr = record->bytenr;
1416
1417 assert_spin_locked(&delayed_refs->lock);
1418 trace_btrfs_qgroup_trace_extent(fs_info, record);
1419
1420 while (*p) {
1421 parent_node = *p;
1422 entry = rb_entry(parent_node, struct btrfs_qgroup_extent_record,
1423 node);
1424 if (bytenr < entry->bytenr)
1425 p = &(*p)->rb_left;
1426 else if (bytenr > entry->bytenr)
1427 p = &(*p)->rb_right;
1428 else
1429 return 1;
1430 }
1431
1432 rb_link_node(&record->node, parent_node, p);
1433 rb_insert_color(&record->node, &delayed_refs->dirty_extent_root);
1434 return 0;
1435 }
1436
1437 int btrfs_qgroup_trace_extent_post(struct btrfs_fs_info *fs_info,
1438 struct btrfs_qgroup_extent_record *qrecord)
1439 {
1440 struct ulist *old_root;
1441 u64 bytenr = qrecord->bytenr;
1442 int ret;
1443
1444 ret = btrfs_find_all_roots(NULL, fs_info, bytenr, 0, &old_root, false);
1445 if (ret < 0)
1446 return ret;
1447
1448 /*
1449 * Here we don't need to get the lock of
1450 * trans->transaction->delayed_refs, since inserted qrecord won't
1451 * be deleted, only qrecord->node may be modified (new qrecord insert)
1452 *
1453 * So modifying qrecord->old_roots is safe here
1454 */
1455 qrecord->old_roots = old_root;
1456 return 0;
1457 }
1458
1459 int btrfs_qgroup_trace_extent(struct btrfs_trans_handle *trans,
1460 struct btrfs_fs_info *fs_info, u64 bytenr, u64 num_bytes,
1461 gfp_t gfp_flag)
1462 {
1463 struct btrfs_qgroup_extent_record *record;
1464 struct btrfs_delayed_ref_root *delayed_refs;
1465 int ret;
1466
1467 if (!test_bit(BTRFS_FS_QUOTA_ENABLED, &fs_info->flags)
1468 || bytenr == 0 || num_bytes == 0)
1469 return 0;
1470 if (WARN_ON(trans == NULL))
1471 return -EINVAL;
1472 record = kmalloc(sizeof(*record), gfp_flag);
1473 if (!record)
1474 return -ENOMEM;
1475
1476 delayed_refs = &trans->transaction->delayed_refs;
1477 record->bytenr = bytenr;
1478 record->num_bytes = num_bytes;
1479 record->old_roots = NULL;
1480
1481 spin_lock(&delayed_refs->lock);
1482 ret = btrfs_qgroup_trace_extent_nolock(fs_info, delayed_refs, record);
1483 spin_unlock(&delayed_refs->lock);
1484 if (ret > 0) {
1485 kfree(record);
1486 return 0;
1487 }
1488 return btrfs_qgroup_trace_extent_post(fs_info, record);
1489 }
1490
1491 int btrfs_qgroup_trace_leaf_items(struct btrfs_trans_handle *trans,
1492 struct btrfs_fs_info *fs_info,
1493 struct extent_buffer *eb)
1494 {
1495 int nr = btrfs_header_nritems(eb);
1496 int i, extent_type, ret;
1497 struct btrfs_key key;
1498 struct btrfs_file_extent_item *fi;
1499 u64 bytenr, num_bytes;
1500
1501 /* We can be called directly from walk_up_proc() */
1502 if (!test_bit(BTRFS_FS_QUOTA_ENABLED, &fs_info->flags))
1503 return 0;
1504
1505 for (i = 0; i < nr; i++) {
1506 btrfs_item_key_to_cpu(eb, &key, i);
1507
1508 if (key.type != BTRFS_EXTENT_DATA_KEY)
1509 continue;
1510
1511 fi = btrfs_item_ptr(eb, i, struct btrfs_file_extent_item);
1512 /* filter out non qgroup-accountable extents */
1513 extent_type = btrfs_file_extent_type(eb, fi);
1514
1515 if (extent_type == BTRFS_FILE_EXTENT_INLINE)
1516 continue;
1517
1518 bytenr = btrfs_file_extent_disk_bytenr(eb, fi);
1519 if (!bytenr)
1520 continue;
1521
1522 num_bytes = btrfs_file_extent_disk_num_bytes(eb, fi);
1523
1524 ret = btrfs_qgroup_trace_extent(trans, fs_info, bytenr,
1525 num_bytes, GFP_NOFS);
1526 if (ret)
1527 return ret;
1528 }
1529 cond_resched();
1530 return 0;
1531 }
1532
1533 /*
1534 * Walk up the tree from the bottom, freeing leaves and any interior
1535 * nodes which have had all slots visited. If a node (leaf or
1536 * interior) is freed, the node above it will have it's slot
1537 * incremented. The root node will never be freed.
1538 *
1539 * At the end of this function, we should have a path which has all
1540 * slots incremented to the next position for a search. If we need to
1541 * read a new node it will be NULL and the node above it will have the
1542 * correct slot selected for a later read.
1543 *
1544 * If we increment the root nodes slot counter past the number of
1545 * elements, 1 is returned to signal completion of the search.
1546 */
1547 static int adjust_slots_upwards(struct btrfs_path *path, int root_level)
1548 {
1549 int level = 0;
1550 int nr, slot;
1551 struct extent_buffer *eb;
1552
1553 if (root_level == 0)
1554 return 1;
1555
1556 while (level <= root_level) {
1557 eb = path->nodes[level];
1558 nr = btrfs_header_nritems(eb);
1559 path->slots[level]++;
1560 slot = path->slots[level];
1561 if (slot >= nr || level == 0) {
1562 /*
1563 * Don't free the root - we will detect this
1564 * condition after our loop and return a
1565 * positive value for caller to stop walking the tree.
1566 */
1567 if (level != root_level) {
1568 btrfs_tree_unlock_rw(eb, path->locks[level]);
1569 path->locks[level] = 0;
1570
1571 free_extent_buffer(eb);
1572 path->nodes[level] = NULL;
1573 path->slots[level] = 0;
1574 }
1575 } else {
1576 /*
1577 * We have a valid slot to walk back down
1578 * from. Stop here so caller can process these
1579 * new nodes.
1580 */
1581 break;
1582 }
1583
1584 level++;
1585 }
1586
1587 eb = path->nodes[root_level];
1588 if (path->slots[root_level] >= btrfs_header_nritems(eb))
1589 return 1;
1590
1591 return 0;
1592 }
1593
1594 int btrfs_qgroup_trace_subtree(struct btrfs_trans_handle *trans,
1595 struct btrfs_root *root,
1596 struct extent_buffer *root_eb,
1597 u64 root_gen, int root_level)
1598 {
1599 struct btrfs_fs_info *fs_info = root->fs_info;
1600 int ret = 0;
1601 int level;
1602 struct extent_buffer *eb = root_eb;
1603 struct btrfs_path *path = NULL;
1604
1605 BUG_ON(root_level < 0 || root_level >= BTRFS_MAX_LEVEL);
1606 BUG_ON(root_eb == NULL);
1607
1608 if (!test_bit(BTRFS_FS_QUOTA_ENABLED, &fs_info->flags))
1609 return 0;
1610
1611 if (!extent_buffer_uptodate(root_eb)) {
1612 ret = btrfs_read_buffer(root_eb, root_gen);
1613 if (ret)
1614 goto out;
1615 }
1616
1617 if (root_level == 0) {
1618 ret = btrfs_qgroup_trace_leaf_items(trans, fs_info, root_eb);
1619 goto out;
1620 }
1621
1622 path = btrfs_alloc_path();
1623 if (!path)
1624 return -ENOMEM;
1625
1626 /*
1627 * Walk down the tree. Missing extent blocks are filled in as
1628 * we go. Metadata is accounted every time we read a new
1629 * extent block.
1630 *
1631 * When we reach a leaf, we account for file extent items in it,
1632 * walk back up the tree (adjusting slot pointers as we go)
1633 * and restart the search process.
1634 */
1635 extent_buffer_get(root_eb); /* For path */
1636 path->nodes[root_level] = root_eb;
1637 path->slots[root_level] = 0;
1638 path->locks[root_level] = 0; /* so release_path doesn't try to unlock */
1639 walk_down:
1640 level = root_level;
1641 while (level >= 0) {
1642 if (path->nodes[level] == NULL) {
1643 int parent_slot;
1644 u64 child_gen;
1645 u64 child_bytenr;
1646
1647 /*
1648 * We need to get child blockptr/gen from parent before
1649 * we can read it.
1650 */
1651 eb = path->nodes[level + 1];
1652 parent_slot = path->slots[level + 1];
1653 child_bytenr = btrfs_node_blockptr(eb, parent_slot);
1654 child_gen = btrfs_node_ptr_generation(eb, parent_slot);
1655
1656 eb = read_tree_block(fs_info, child_bytenr, child_gen);
1657 if (IS_ERR(eb)) {
1658 ret = PTR_ERR(eb);
1659 goto out;
1660 } else if (!extent_buffer_uptodate(eb)) {
1661 free_extent_buffer(eb);
1662 ret = -EIO;
1663 goto out;
1664 }
1665
1666 path->nodes[level] = eb;
1667 path->slots[level] = 0;
1668
1669 btrfs_tree_read_lock(eb);
1670 btrfs_set_lock_blocking_rw(eb, BTRFS_READ_LOCK);
1671 path->locks[level] = BTRFS_READ_LOCK_BLOCKING;
1672
1673 ret = btrfs_qgroup_trace_extent(trans, fs_info,
1674 child_bytenr,
1675 fs_info->nodesize,
1676 GFP_NOFS);
1677 if (ret)
1678 goto out;
1679 }
1680
1681 if (level == 0) {
1682 ret = btrfs_qgroup_trace_leaf_items(trans,fs_info,
1683 path->nodes[level]);
1684 if (ret)
1685 goto out;
1686
1687 /* Nonzero return here means we completed our search */
1688 ret = adjust_slots_upwards(path, root_level);
1689 if (ret)
1690 break;
1691
1692 /* Restart search with new slots */
1693 goto walk_down;
1694 }
1695
1696 level--;
1697 }
1698
1699 ret = 0;
1700 out:
1701 btrfs_free_path(path);
1702
1703 return ret;
1704 }
1705
1706 #define UPDATE_NEW 0
1707 #define UPDATE_OLD 1
1708 /*
1709 * Walk all of the roots that points to the bytenr and adjust their refcnts.
1710 */
1711 static int qgroup_update_refcnt(struct btrfs_fs_info *fs_info,
1712 struct ulist *roots, struct ulist *tmp,
1713 struct ulist *qgroups, u64 seq, int update_old)
1714 {
1715 struct ulist_node *unode;
1716 struct ulist_iterator uiter;
1717 struct ulist_node *tmp_unode;
1718 struct ulist_iterator tmp_uiter;
1719 struct btrfs_qgroup *qg;
1720 int ret = 0;
1721
1722 if (!roots)
1723 return 0;
1724 ULIST_ITER_INIT(&uiter);
1725 while ((unode = ulist_next(roots, &uiter))) {
1726 qg = find_qgroup_rb(fs_info, unode->val);
1727 if (!qg)
1728 continue;
1729
1730 ulist_reinit(tmp);
1731 ret = ulist_add(qgroups, qg->qgroupid, qgroup_to_aux(qg),
1732 GFP_ATOMIC);
1733 if (ret < 0)
1734 return ret;
1735 ret = ulist_add(tmp, qg->qgroupid, qgroup_to_aux(qg), GFP_ATOMIC);
1736 if (ret < 0)
1737 return ret;
1738 ULIST_ITER_INIT(&tmp_uiter);
1739 while ((tmp_unode = ulist_next(tmp, &tmp_uiter))) {
1740 struct btrfs_qgroup_list *glist;
1741
1742 qg = unode_aux_to_qgroup(tmp_unode);
1743 if (update_old)
1744 btrfs_qgroup_update_old_refcnt(qg, seq, 1);
1745 else
1746 btrfs_qgroup_update_new_refcnt(qg, seq, 1);
1747 list_for_each_entry(glist, &qg->groups, next_group) {
1748 ret = ulist_add(qgroups, glist->group->qgroupid,
1749 qgroup_to_aux(glist->group),
1750 GFP_ATOMIC);
1751 if (ret < 0)
1752 return ret;
1753 ret = ulist_add(tmp, glist->group->qgroupid,
1754 qgroup_to_aux(glist->group),
1755 GFP_ATOMIC);
1756 if (ret < 0)
1757 return ret;
1758 }
1759 }
1760 }
1761 return 0;
1762 }
1763
1764 /*
1765 * Update qgroup rfer/excl counters.
1766 * Rfer update is easy, codes can explain themselves.
1767 *
1768 * Excl update is tricky, the update is split into 2 part.
1769 * Part 1: Possible exclusive <-> sharing detect:
1770 * | A | !A |
1771 * -------------------------------------
1772 * B | * | - |
1773 * -------------------------------------
1774 * !B | + | ** |
1775 * -------------------------------------
1776 *
1777 * Conditions:
1778 * A: cur_old_roots < nr_old_roots (not exclusive before)
1779 * !A: cur_old_roots == nr_old_roots (possible exclusive before)
1780 * B: cur_new_roots < nr_new_roots (not exclusive now)
1781 * !B: cur_new_roots == nr_new_roots (possible exclusive now)
1782 *
1783 * Results:
1784 * +: Possible sharing -> exclusive -: Possible exclusive -> sharing
1785 * *: Definitely not changed. **: Possible unchanged.
1786 *
1787 * For !A and !B condition, the exception is cur_old/new_roots == 0 case.
1788 *
1789 * To make the logic clear, we first use condition A and B to split
1790 * combination into 4 results.
1791 *
1792 * Then, for result "+" and "-", check old/new_roots == 0 case, as in them
1793 * only on variant maybe 0.
1794 *
1795 * Lastly, check result **, since there are 2 variants maybe 0, split them
1796 * again(2x2).
1797 * But this time we don't need to consider other things, the codes and logic
1798 * is easy to understand now.
1799 */
1800 static int qgroup_update_counters(struct btrfs_fs_info *fs_info,
1801 struct ulist *qgroups,
1802 u64 nr_old_roots,
1803 u64 nr_new_roots,
1804 u64 num_bytes, u64 seq)
1805 {
1806 struct ulist_node *unode;
1807 struct ulist_iterator uiter;
1808 struct btrfs_qgroup *qg;
1809 u64 cur_new_count, cur_old_count;
1810
1811 ULIST_ITER_INIT(&uiter);
1812 while ((unode = ulist_next(qgroups, &uiter))) {
1813 bool dirty = false;
1814
1815 qg = unode_aux_to_qgroup(unode);
1816 cur_old_count = btrfs_qgroup_get_old_refcnt(qg, seq);
1817 cur_new_count = btrfs_qgroup_get_new_refcnt(qg, seq);
1818
1819 trace_qgroup_update_counters(fs_info, qg->qgroupid,
1820 cur_old_count, cur_new_count);
1821
1822 /* Rfer update part */
1823 if (cur_old_count == 0 && cur_new_count > 0) {
1824 qg->rfer += num_bytes;
1825 qg->rfer_cmpr += num_bytes;
1826 dirty = true;
1827 }
1828 if (cur_old_count > 0 && cur_new_count == 0) {
1829 qg->rfer -= num_bytes;
1830 qg->rfer_cmpr -= num_bytes;
1831 dirty = true;
1832 }
1833
1834 /* Excl update part */
1835 /* Exclusive/none -> shared case */
1836 if (cur_old_count == nr_old_roots &&
1837 cur_new_count < nr_new_roots) {
1838 /* Exclusive -> shared */
1839 if (cur_old_count != 0) {
1840 qg->excl -= num_bytes;
1841 qg->excl_cmpr -= num_bytes;
1842 dirty = true;
1843 }
1844 }
1845
1846 /* Shared -> exclusive/none case */
1847 if (cur_old_count < nr_old_roots &&
1848 cur_new_count == nr_new_roots) {
1849 /* Shared->exclusive */
1850 if (cur_new_count != 0) {
1851 qg->excl += num_bytes;
1852 qg->excl_cmpr += num_bytes;
1853 dirty = true;
1854 }
1855 }
1856
1857 /* Exclusive/none -> exclusive/none case */
1858 if (cur_old_count == nr_old_roots &&
1859 cur_new_count == nr_new_roots) {
1860 if (cur_old_count == 0) {
1861 /* None -> exclusive/none */
1862
1863 if (cur_new_count != 0) {
1864 /* None -> exclusive */
1865 qg->excl += num_bytes;
1866 qg->excl_cmpr += num_bytes;
1867 dirty = true;
1868 }
1869 /* None -> none, nothing changed */
1870 } else {
1871 /* Exclusive -> exclusive/none */
1872
1873 if (cur_new_count == 0) {
1874 /* Exclusive -> none */
1875 qg->excl -= num_bytes;
1876 qg->excl_cmpr -= num_bytes;
1877 dirty = true;
1878 }
1879 /* Exclusive -> exclusive, nothing changed */
1880 }
1881 }
1882
1883 if (dirty)
1884 qgroup_dirty(fs_info, qg);
1885 }
1886 return 0;
1887 }
1888
1889 /*
1890 * Check if the @roots potentially is a list of fs tree roots
1891 *
1892 * Return 0 for definitely not a fs/subvol tree roots ulist
1893 * Return 1 for possible fs/subvol tree roots in the list (considering an empty
1894 * one as well)
1895 */
1896 static int maybe_fs_roots(struct ulist *roots)
1897 {
1898 struct ulist_node *unode;
1899 struct ulist_iterator uiter;
1900
1901 /* Empty one, still possible for fs roots */
1902 if (!roots || roots->nnodes == 0)
1903 return 1;
1904
1905 ULIST_ITER_INIT(&uiter);
1906 unode = ulist_next(roots, &uiter);
1907 if (!unode)
1908 return 1;
1909
1910 /*
1911 * If it contains fs tree roots, then it must belong to fs/subvol
1912 * trees.
1913 * If it contains a non-fs tree, it won't be shared with fs/subvol trees.
1914 */
1915 return is_fstree(unode->val);
1916 }
1917
1918 int
1919 btrfs_qgroup_account_extent(struct btrfs_trans_handle *trans,
1920 struct btrfs_fs_info *fs_info,
1921 u64 bytenr, u64 num_bytes,
1922 struct ulist *old_roots, struct ulist *new_roots)
1923 {
1924 struct ulist *qgroups = NULL;
1925 struct ulist *tmp = NULL;
1926 u64 seq;
1927 u64 nr_new_roots = 0;
1928 u64 nr_old_roots = 0;
1929 int ret = 0;
1930
1931 if (!test_bit(BTRFS_FS_QUOTA_ENABLED, &fs_info->flags))
1932 return 0;
1933
1934 if (new_roots) {
1935 if (!maybe_fs_roots(new_roots))
1936 goto out_free;
1937 nr_new_roots = new_roots->nnodes;
1938 }
1939 if (old_roots) {
1940 if (!maybe_fs_roots(old_roots))
1941 goto out_free;
1942 nr_old_roots = old_roots->nnodes;
1943 }
1944
1945 /* Quick exit, either not fs tree roots, or won't affect any qgroup */
1946 if (nr_old_roots == 0 && nr_new_roots == 0)
1947 goto out_free;
1948
1949 BUG_ON(!fs_info->quota_root);
1950
1951 trace_btrfs_qgroup_account_extent(fs_info, bytenr, num_bytes,
1952 nr_old_roots, nr_new_roots);
1953
1954 qgroups = ulist_alloc(GFP_NOFS);
1955 if (!qgroups) {
1956 ret = -ENOMEM;
1957 goto out_free;
1958 }
1959 tmp = ulist_alloc(GFP_NOFS);
1960 if (!tmp) {
1961 ret = -ENOMEM;
1962 goto out_free;
1963 }
1964
1965 mutex_lock(&fs_info->qgroup_rescan_lock);
1966 if (fs_info->qgroup_flags & BTRFS_QGROUP_STATUS_FLAG_RESCAN) {
1967 if (fs_info->qgroup_rescan_progress.objectid <= bytenr) {
1968 mutex_unlock(&fs_info->qgroup_rescan_lock);
1969 ret = 0;
1970 goto out_free;
1971 }
1972 }
1973 mutex_unlock(&fs_info->qgroup_rescan_lock);
1974
1975 spin_lock(&fs_info->qgroup_lock);
1976 seq = fs_info->qgroup_seq;
1977
1978 /* Update old refcnts using old_roots */
1979 ret = qgroup_update_refcnt(fs_info, old_roots, tmp, qgroups, seq,
1980 UPDATE_OLD);
1981 if (ret < 0)
1982 goto out;
1983
1984 /* Update new refcnts using new_roots */
1985 ret = qgroup_update_refcnt(fs_info, new_roots, tmp, qgroups, seq,
1986 UPDATE_NEW);
1987 if (ret < 0)
1988 goto out;
1989
1990 qgroup_update_counters(fs_info, qgroups, nr_old_roots, nr_new_roots,
1991 num_bytes, seq);
1992
1993 /*
1994 * Bump qgroup_seq to avoid seq overlap
1995 */
1996 fs_info->qgroup_seq += max(nr_old_roots, nr_new_roots) + 1;
1997 out:
1998 spin_unlock(&fs_info->qgroup_lock);
1999 out_free:
2000 ulist_free(tmp);
2001 ulist_free(qgroups);
2002 ulist_free(old_roots);
2003 ulist_free(new_roots);
2004 return ret;
2005 }
2006
2007 int btrfs_qgroup_account_extents(struct btrfs_trans_handle *trans,
2008 struct btrfs_fs_info *fs_info)
2009 {
2010 struct btrfs_qgroup_extent_record *record;
2011 struct btrfs_delayed_ref_root *delayed_refs;
2012 struct ulist *new_roots = NULL;
2013 struct rb_node *node;
2014 u64 qgroup_to_skip;
2015 int ret = 0;
2016
2017 delayed_refs = &trans->transaction->delayed_refs;
2018 qgroup_to_skip = delayed_refs->qgroup_to_skip;
2019 while ((node = rb_first(&delayed_refs->dirty_extent_root))) {
2020 record = rb_entry(node, struct btrfs_qgroup_extent_record,
2021 node);
2022
2023 trace_btrfs_qgroup_account_extents(fs_info, record);
2024
2025 if (!ret) {
2026 /*
2027 * Old roots should be searched when inserting qgroup
2028 * extent record
2029 */
2030 if (WARN_ON(!record->old_roots)) {
2031 /* Search commit root to find old_roots */
2032 ret = btrfs_find_all_roots(NULL, fs_info,
2033 record->bytenr, 0,
2034 &record->old_roots, false);
2035 if (ret < 0)
2036 goto cleanup;
2037 }
2038
2039 /*
2040 * Use SEQ_LAST as time_seq to do special search, which
2041 * doesn't lock tree or delayed_refs and search current
2042 * root. It's safe inside commit_transaction().
2043 */
2044 ret = btrfs_find_all_roots(trans, fs_info,
2045 record->bytenr, SEQ_LAST, &new_roots, false);
2046 if (ret < 0)
2047 goto cleanup;
2048 if (qgroup_to_skip) {
2049 ulist_del(new_roots, qgroup_to_skip, 0);
2050 ulist_del(record->old_roots, qgroup_to_skip,
2051 0);
2052 }
2053 ret = btrfs_qgroup_account_extent(trans, fs_info,
2054 record->bytenr, record->num_bytes,
2055 record->old_roots, new_roots);
2056 record->old_roots = NULL;
2057 new_roots = NULL;
2058 }
2059 cleanup:
2060 ulist_free(record->old_roots);
2061 ulist_free(new_roots);
2062 new_roots = NULL;
2063 rb_erase(node, &delayed_refs->dirty_extent_root);
2064 kfree(record);
2065
2066 }
2067 return ret;
2068 }
2069
2070 /*
2071 * called from commit_transaction. Writes all changed qgroups to disk.
2072 */
2073 int btrfs_run_qgroups(struct btrfs_trans_handle *trans,
2074 struct btrfs_fs_info *fs_info)
2075 {
2076 struct btrfs_root *quota_root = fs_info->quota_root;
2077 int ret = 0;
2078 int start_rescan_worker = 0;
2079
2080 if (!quota_root)
2081 goto out;
2082
2083 if (!test_bit(BTRFS_FS_QUOTA_ENABLED, &fs_info->flags) &&
2084 test_bit(BTRFS_FS_QUOTA_ENABLING, &fs_info->flags))
2085 start_rescan_worker = 1;
2086
2087 if (test_and_clear_bit(BTRFS_FS_QUOTA_ENABLING, &fs_info->flags))
2088 set_bit(BTRFS_FS_QUOTA_ENABLED, &fs_info->flags);
2089
2090 spin_lock(&fs_info->qgroup_lock);
2091 while (!list_empty(&fs_info->dirty_qgroups)) {
2092 struct btrfs_qgroup *qgroup;
2093 qgroup = list_first_entry(&fs_info->dirty_qgroups,
2094 struct btrfs_qgroup, dirty);
2095 list_del_init(&qgroup->dirty);
2096 spin_unlock(&fs_info->qgroup_lock);
2097 ret = update_qgroup_info_item(trans, quota_root, qgroup);
2098 if (ret)
2099 fs_info->qgroup_flags |=
2100 BTRFS_QGROUP_STATUS_FLAG_INCONSISTENT;
2101 ret = update_qgroup_limit_item(trans, quota_root, qgroup);
2102 if (ret)
2103 fs_info->qgroup_flags |=
2104 BTRFS_QGROUP_STATUS_FLAG_INCONSISTENT;
2105 spin_lock(&fs_info->qgroup_lock);
2106 }
2107 if (test_bit(BTRFS_FS_QUOTA_ENABLED, &fs_info->flags))
2108 fs_info->qgroup_flags |= BTRFS_QGROUP_STATUS_FLAG_ON;
2109 else
2110 fs_info->qgroup_flags &= ~BTRFS_QGROUP_STATUS_FLAG_ON;
2111 spin_unlock(&fs_info->qgroup_lock);
2112
2113 ret = update_qgroup_status_item(trans, fs_info, quota_root);
2114 if (ret)
2115 fs_info->qgroup_flags |= BTRFS_QGROUP_STATUS_FLAG_INCONSISTENT;
2116
2117 if (!ret && start_rescan_worker) {
2118 ret = qgroup_rescan_init(fs_info, 0, 1);
2119 if (!ret) {
2120 qgroup_rescan_zero_tracking(fs_info);
2121 btrfs_queue_work(fs_info->qgroup_rescan_workers,
2122 &fs_info->qgroup_rescan_work);
2123 }
2124 ret = 0;
2125 }
2126
2127 out:
2128
2129 return ret;
2130 }
2131
2132 /*
2133 * Copy the accounting information between qgroups. This is necessary
2134 * when a snapshot or a subvolume is created. Throwing an error will
2135 * cause a transaction abort so we take extra care here to only error
2136 * when a readonly fs is a reasonable outcome.
2137 */
2138 int btrfs_qgroup_inherit(struct btrfs_trans_handle *trans,
2139 struct btrfs_fs_info *fs_info, u64 srcid, u64 objectid,
2140 struct btrfs_qgroup_inherit *inherit)
2141 {
2142 int ret = 0;
2143 int i;
2144 u64 *i_qgroups;
2145 struct btrfs_root *quota_root = fs_info->quota_root;
2146 struct btrfs_qgroup *srcgroup;
2147 struct btrfs_qgroup *dstgroup;
2148 u32 level_size = 0;
2149 u64 nums;
2150
2151 mutex_lock(&fs_info->qgroup_ioctl_lock);
2152 if (!test_bit(BTRFS_FS_QUOTA_ENABLED, &fs_info->flags))
2153 goto out;
2154
2155 if (!quota_root) {
2156 ret = -EINVAL;
2157 goto out;
2158 }
2159
2160 if (inherit) {
2161 i_qgroups = (u64 *)(inherit + 1);
2162 nums = inherit->num_qgroups + 2 * inherit->num_ref_copies +
2163 2 * inherit->num_excl_copies;
2164 for (i = 0; i < nums; ++i) {
2165 srcgroup = find_qgroup_rb(fs_info, *i_qgroups);
2166
2167 /*
2168 * Zero out invalid groups so we can ignore
2169 * them later.
2170 */
2171 if (!srcgroup ||
2172 ((srcgroup->qgroupid >> 48) <= (objectid >> 48)))
2173 *i_qgroups = 0ULL;
2174
2175 ++i_qgroups;
2176 }
2177 }
2178
2179 /*
2180 * create a tracking group for the subvol itself
2181 */
2182 ret = add_qgroup_item(trans, quota_root, objectid);
2183 if (ret)
2184 goto out;
2185
2186 if (srcid) {
2187 struct btrfs_root *srcroot;
2188 struct btrfs_key srckey;
2189
2190 srckey.objectid = srcid;
2191 srckey.type = BTRFS_ROOT_ITEM_KEY;
2192 srckey.offset = (u64)-1;
2193 srcroot = btrfs_read_fs_root_no_name(fs_info, &srckey);
2194 if (IS_ERR(srcroot)) {
2195 ret = PTR_ERR(srcroot);
2196 goto out;
2197 }
2198
2199 level_size = fs_info->nodesize;
2200 }
2201
2202 /*
2203 * add qgroup to all inherited groups
2204 */
2205 if (inherit) {
2206 i_qgroups = (u64 *)(inherit + 1);
2207 for (i = 0; i < inherit->num_qgroups; ++i, ++i_qgroups) {
2208 if (*i_qgroups == 0)
2209 continue;
2210 ret = add_qgroup_relation_item(trans, quota_root,
2211 objectid, *i_qgroups);
2212 if (ret && ret != -EEXIST)
2213 goto out;
2214 ret = add_qgroup_relation_item(trans, quota_root,
2215 *i_qgroups, objectid);
2216 if (ret && ret != -EEXIST)
2217 goto out;
2218 }
2219 ret = 0;
2220 }
2221
2222
2223 spin_lock(&fs_info->qgroup_lock);
2224
2225 dstgroup = add_qgroup_rb(fs_info, objectid);
2226 if (IS_ERR(dstgroup)) {
2227 ret = PTR_ERR(dstgroup);
2228 goto unlock;
2229 }
2230
2231 if (inherit && inherit->flags & BTRFS_QGROUP_INHERIT_SET_LIMITS) {
2232 dstgroup->lim_flags = inherit->lim.flags;
2233 dstgroup->max_rfer = inherit->lim.max_rfer;
2234 dstgroup->max_excl = inherit->lim.max_excl;
2235 dstgroup->rsv_rfer = inherit->lim.rsv_rfer;
2236 dstgroup->rsv_excl = inherit->lim.rsv_excl;
2237
2238 ret = update_qgroup_limit_item(trans, quota_root, dstgroup);
2239 if (ret) {
2240 fs_info->qgroup_flags |= BTRFS_QGROUP_STATUS_FLAG_INCONSISTENT;
2241 btrfs_info(fs_info,
2242 "unable to update quota limit for %llu",
2243 dstgroup->qgroupid);
2244 goto unlock;
2245 }
2246 }
2247
2248 if (srcid) {
2249 srcgroup = find_qgroup_rb(fs_info, srcid);
2250 if (!srcgroup)
2251 goto unlock;
2252
2253 /*
2254 * We call inherit after we clone the root in order to make sure
2255 * our counts don't go crazy, so at this point the only
2256 * difference between the two roots should be the root node.
2257 */
2258 dstgroup->rfer = srcgroup->rfer;
2259 dstgroup->rfer_cmpr = srcgroup->rfer_cmpr;
2260 dstgroup->excl = level_size;
2261 dstgroup->excl_cmpr = level_size;
2262 srcgroup->excl = level_size;
2263 srcgroup->excl_cmpr = level_size;
2264
2265 /* inherit the limit info */
2266 dstgroup->lim_flags = srcgroup->lim_flags;
2267 dstgroup->max_rfer = srcgroup->max_rfer;
2268 dstgroup->max_excl = srcgroup->max_excl;
2269 dstgroup->rsv_rfer = srcgroup->rsv_rfer;
2270 dstgroup->rsv_excl = srcgroup->rsv_excl;
2271
2272 qgroup_dirty(fs_info, dstgroup);
2273 qgroup_dirty(fs_info, srcgroup);
2274 }
2275
2276 if (!inherit)
2277 goto unlock;
2278
2279 i_qgroups = (u64 *)(inherit + 1);
2280 for (i = 0; i < inherit->num_qgroups; ++i) {
2281 if (*i_qgroups) {
2282 ret = add_relation_rb(fs_info, objectid, *i_qgroups);
2283 if (ret)
2284 goto unlock;
2285 }
2286 ++i_qgroups;
2287 }
2288
2289 for (i = 0; i < inherit->num_ref_copies; ++i, i_qgroups += 2) {
2290 struct btrfs_qgroup *src;
2291 struct btrfs_qgroup *dst;
2292
2293 if (!i_qgroups[0] || !i_qgroups[1])
2294 continue;
2295
2296 src = find_qgroup_rb(fs_info, i_qgroups[0]);
2297 dst = find_qgroup_rb(fs_info, i_qgroups[1]);
2298
2299 if (!src || !dst) {
2300 ret = -EINVAL;
2301 goto unlock;
2302 }
2303
2304 dst->rfer = src->rfer - level_size;
2305 dst->rfer_cmpr = src->rfer_cmpr - level_size;
2306 }
2307 for (i = 0; i < inherit->num_excl_copies; ++i, i_qgroups += 2) {
2308 struct btrfs_qgroup *src;
2309 struct btrfs_qgroup *dst;
2310
2311 if (!i_qgroups[0] || !i_qgroups[1])
2312 continue;
2313
2314 src = find_qgroup_rb(fs_info, i_qgroups[0]);
2315 dst = find_qgroup_rb(fs_info, i_qgroups[1]);
2316
2317 if (!src || !dst) {
2318 ret = -EINVAL;
2319 goto unlock;
2320 }
2321
2322 dst->excl = src->excl + level_size;
2323 dst->excl_cmpr = src->excl_cmpr + level_size;
2324 }
2325
2326 unlock:
2327 spin_unlock(&fs_info->qgroup_lock);
2328 out:
2329 mutex_unlock(&fs_info->qgroup_ioctl_lock);
2330 return ret;
2331 }
2332
2333 static bool qgroup_check_limits(const struct btrfs_qgroup *qg, u64 num_bytes)
2334 {
2335 if ((qg->lim_flags & BTRFS_QGROUP_LIMIT_MAX_RFER) &&
2336 qg->reserved + (s64)qg->rfer + num_bytes > qg->max_rfer)
2337 return false;
2338
2339 if ((qg->lim_flags & BTRFS_QGROUP_LIMIT_MAX_EXCL) &&
2340 qg->reserved + (s64)qg->excl + num_bytes > qg->max_excl)
2341 return false;
2342
2343 return true;
2344 }
2345
2346 static int qgroup_reserve(struct btrfs_root *root, u64 num_bytes, bool enforce)
2347 {
2348 struct btrfs_root *quota_root;
2349 struct btrfs_qgroup *qgroup;
2350 struct btrfs_fs_info *fs_info = root->fs_info;
2351 u64 ref_root = root->root_key.objectid;
2352 int ret = 0;
2353 int retried = 0;
2354 struct ulist_node *unode;
2355 struct ulist_iterator uiter;
2356
2357 if (!is_fstree(ref_root))
2358 return 0;
2359
2360 if (num_bytes == 0)
2361 return 0;
2362
2363 if (test_bit(BTRFS_FS_QUOTA_OVERRIDE, &fs_info->flags) &&
2364 capable(CAP_SYS_RESOURCE))
2365 enforce = false;
2366
2367 retry:
2368 spin_lock(&fs_info->qgroup_lock);
2369 quota_root = fs_info->quota_root;
2370 if (!quota_root)
2371 goto out;
2372
2373 qgroup = find_qgroup_rb(fs_info, ref_root);
2374 if (!qgroup)
2375 goto out;
2376
2377 /*
2378 * in a first step, we check all affected qgroups if any limits would
2379 * be exceeded
2380 */
2381 ulist_reinit(fs_info->qgroup_ulist);
2382 ret = ulist_add(fs_info->qgroup_ulist, qgroup->qgroupid,
2383 (uintptr_t)qgroup, GFP_ATOMIC);
2384 if (ret < 0)
2385 goto out;
2386 ULIST_ITER_INIT(&uiter);
2387 while ((unode = ulist_next(fs_info->qgroup_ulist, &uiter))) {
2388 struct btrfs_qgroup *qg;
2389 struct btrfs_qgroup_list *glist;
2390
2391 qg = unode_aux_to_qgroup(unode);
2392
2393 if (enforce && !qgroup_check_limits(qg, num_bytes)) {
2394 /*
2395 * Commit the tree and retry, since we may have
2396 * deletions which would free up space.
2397 */
2398 if (!retried && qg->reserved > 0) {
2399 struct btrfs_trans_handle *trans;
2400
2401 spin_unlock(&fs_info->qgroup_lock);
2402 ret = btrfs_start_delalloc_inodes(root, 0);
2403 if (ret)
2404 return ret;
2405 btrfs_wait_ordered_extents(root, U64_MAX, 0, (u64)-1);
2406 trans = btrfs_join_transaction(root);
2407 if (IS_ERR(trans))
2408 return PTR_ERR(trans);
2409 ret = btrfs_commit_transaction(trans);
2410 if (ret)
2411 return ret;
2412 retried++;
2413 goto retry;
2414 }
2415 ret = -EDQUOT;
2416 goto out;
2417 }
2418
2419 list_for_each_entry(glist, &qg->groups, next_group) {
2420 ret = ulist_add(fs_info->qgroup_ulist,
2421 glist->group->qgroupid,
2422 (uintptr_t)glist->group, GFP_ATOMIC);
2423 if (ret < 0)
2424 goto out;
2425 }
2426 }
2427 ret = 0;
2428 /*
2429 * no limits exceeded, now record the reservation into all qgroups
2430 */
2431 ULIST_ITER_INIT(&uiter);
2432 while ((unode = ulist_next(fs_info->qgroup_ulist, &uiter))) {
2433 struct btrfs_qgroup *qg;
2434
2435 qg = unode_aux_to_qgroup(unode);
2436
2437 trace_qgroup_update_reserve(fs_info, qg, num_bytes);
2438 qg->reserved += num_bytes;
2439 }
2440
2441 out:
2442 spin_unlock(&fs_info->qgroup_lock);
2443 return ret;
2444 }
2445
2446 void btrfs_qgroup_free_refroot(struct btrfs_fs_info *fs_info,
2447 u64 ref_root, u64 num_bytes)
2448 {
2449 struct btrfs_root *quota_root;
2450 struct btrfs_qgroup *qgroup;
2451 struct ulist_node *unode;
2452 struct ulist_iterator uiter;
2453 int ret = 0;
2454
2455 if (!is_fstree(ref_root))
2456 return;
2457
2458 if (num_bytes == 0)
2459 return;
2460
2461 spin_lock(&fs_info->qgroup_lock);
2462
2463 quota_root = fs_info->quota_root;
2464 if (!quota_root)
2465 goto out;
2466
2467 qgroup = find_qgroup_rb(fs_info, ref_root);
2468 if (!qgroup)
2469 goto out;
2470
2471 ulist_reinit(fs_info->qgroup_ulist);
2472 ret = ulist_add(fs_info->qgroup_ulist, qgroup->qgroupid,
2473 (uintptr_t)qgroup, GFP_ATOMIC);
2474 if (ret < 0)
2475 goto out;
2476 ULIST_ITER_INIT(&uiter);
2477 while ((unode = ulist_next(fs_info->qgroup_ulist, &uiter))) {
2478 struct btrfs_qgroup *qg;
2479 struct btrfs_qgroup_list *glist;
2480
2481 qg = unode_aux_to_qgroup(unode);
2482
2483 trace_qgroup_update_reserve(fs_info, qg, -(s64)num_bytes);
2484 if (qg->reserved < num_bytes)
2485 report_reserved_underflow(fs_info, qg, num_bytes);
2486 else
2487 qg->reserved -= num_bytes;
2488
2489 list_for_each_entry(glist, &qg->groups, next_group) {
2490 ret = ulist_add(fs_info->qgroup_ulist,
2491 glist->group->qgroupid,
2492 (uintptr_t)glist->group, GFP_ATOMIC);
2493 if (ret < 0)
2494 goto out;
2495 }
2496 }
2497
2498 out:
2499 spin_unlock(&fs_info->qgroup_lock);
2500 }
2501
2502 /*
2503 * Check if the leaf is the last leaf. Which means all node pointers
2504 * are at their last position.
2505 */
2506 static bool is_last_leaf(struct btrfs_path *path)
2507 {
2508 int i;
2509
2510 for (i = 1; i < BTRFS_MAX_LEVEL && path->nodes[i]; i++) {
2511 if (path->slots[i] != btrfs_header_nritems(path->nodes[i]) - 1)
2512 return false;
2513 }
2514 return true;
2515 }
2516
2517 /*
2518 * returns < 0 on error, 0 when more leafs are to be scanned.
2519 * returns 1 when done.
2520 */
2521 static int
2522 qgroup_rescan_leaf(struct btrfs_fs_info *fs_info, struct btrfs_path *path,
2523 struct btrfs_trans_handle *trans)
2524 {
2525 struct btrfs_key found;
2526 struct extent_buffer *scratch_leaf = NULL;
2527 struct ulist *roots = NULL;
2528 struct seq_list tree_mod_seq_elem = SEQ_LIST_INIT(tree_mod_seq_elem);
2529 u64 num_bytes;
2530 bool done;
2531 int slot;
2532 int ret;
2533
2534 mutex_lock(&fs_info->qgroup_rescan_lock);
2535 ret = btrfs_search_slot_for_read(fs_info->extent_root,
2536 &fs_info->qgroup_rescan_progress,
2537 path, 1, 0);
2538
2539 btrfs_debug(fs_info,
2540 "current progress key (%llu %u %llu), search_slot ret %d",
2541 fs_info->qgroup_rescan_progress.objectid,
2542 fs_info->qgroup_rescan_progress.type,
2543 fs_info->qgroup_rescan_progress.offset, ret);
2544
2545 if (ret) {
2546 /*
2547 * The rescan is about to end, we will not be scanning any
2548 * further blocks. We cannot unset the RESCAN flag here, because
2549 * we want to commit the transaction if everything went well.
2550 * To make the live accounting work in this phase, we set our
2551 * scan progress pointer such that every real extent objectid
2552 * will be smaller.
2553 */
2554 fs_info->qgroup_rescan_progress.objectid = (u64)-1;
2555 btrfs_release_path(path);
2556 mutex_unlock(&fs_info->qgroup_rescan_lock);
2557 return ret;
2558 }
2559 done = is_last_leaf(path);
2560
2561 btrfs_item_key_to_cpu(path->nodes[0], &found,
2562 btrfs_header_nritems(path->nodes[0]) - 1);
2563 fs_info->qgroup_rescan_progress.objectid = found.objectid + 1;
2564
2565 btrfs_get_tree_mod_seq(fs_info, &tree_mod_seq_elem);
2566 scratch_leaf = btrfs_clone_extent_buffer(path->nodes[0]);
2567 if (!scratch_leaf) {
2568 ret = -ENOMEM;
2569 mutex_unlock(&fs_info->qgroup_rescan_lock);
2570 goto out;
2571 }
2572 extent_buffer_get(scratch_leaf);
2573 btrfs_tree_read_lock(scratch_leaf);
2574 btrfs_set_lock_blocking_rw(scratch_leaf, BTRFS_READ_LOCK);
2575 slot = path->slots[0];
2576 btrfs_release_path(path);
2577 mutex_unlock(&fs_info->qgroup_rescan_lock);
2578
2579 for (; slot < btrfs_header_nritems(scratch_leaf); ++slot) {
2580 btrfs_item_key_to_cpu(scratch_leaf, &found, slot);
2581 if (found.type != BTRFS_EXTENT_ITEM_KEY &&
2582 found.type != BTRFS_METADATA_ITEM_KEY)
2583 continue;
2584 if (found.type == BTRFS_METADATA_ITEM_KEY)
2585 num_bytes = fs_info->nodesize;
2586 else
2587 num_bytes = found.offset;
2588
2589 ret = btrfs_find_all_roots(NULL, fs_info, found.objectid, 0,
2590 &roots, false);
2591 if (ret < 0)
2592 goto out;
2593 /* For rescan, just pass old_roots as NULL */
2594 ret = btrfs_qgroup_account_extent(trans, fs_info,
2595 found.objectid, num_bytes, NULL, roots);
2596 if (ret < 0)
2597 goto out;
2598 }
2599 out:
2600 if (scratch_leaf) {
2601 btrfs_tree_read_unlock_blocking(scratch_leaf);
2602 free_extent_buffer(scratch_leaf);
2603 }
2604 btrfs_put_tree_mod_seq(fs_info, &tree_mod_seq_elem);
2605
2606 if (done && !ret) {
2607 ret = 1;
2608 fs_info->qgroup_rescan_progress.objectid = (u64)-1;
2609 }
2610 return ret;
2611 }
2612
2613 static void btrfs_qgroup_rescan_worker(struct btrfs_work *work)
2614 {
2615 struct btrfs_fs_info *fs_info = container_of(work, struct btrfs_fs_info,
2616 qgroup_rescan_work);
2617 struct btrfs_path *path;
2618 struct btrfs_trans_handle *trans = NULL;
2619 int err = -ENOMEM;
2620 int ret = 0;
2621
2622 path = btrfs_alloc_path();
2623 if (!path)
2624 goto out;
2625
2626 err = 0;
2627 while (!err && !btrfs_fs_closing(fs_info)) {
2628 trans = btrfs_start_transaction(fs_info->fs_root, 0);
2629 if (IS_ERR(trans)) {
2630 err = PTR_ERR(trans);
2631 break;
2632 }
2633 if (!test_bit(BTRFS_FS_QUOTA_ENABLED, &fs_info->flags)) {
2634 err = -EINTR;
2635 } else {
2636 err = qgroup_rescan_leaf(fs_info, path, trans);
2637 }
2638 if (err > 0)
2639 btrfs_commit_transaction(trans);
2640 else
2641 btrfs_end_transaction(trans);
2642 }
2643
2644 out:
2645 btrfs_free_path(path);
2646
2647 mutex_lock(&fs_info->qgroup_rescan_lock);
2648 if (!btrfs_fs_closing(fs_info))
2649 fs_info->qgroup_flags &= ~BTRFS_QGROUP_STATUS_FLAG_RESCAN;
2650
2651 if (err > 0 &&
2652 fs_info->qgroup_flags & BTRFS_QGROUP_STATUS_FLAG_INCONSISTENT) {
2653 fs_info->qgroup_flags &= ~BTRFS_QGROUP_STATUS_FLAG_INCONSISTENT;
2654 } else if (err < 0) {
2655 fs_info->qgroup_flags |= BTRFS_QGROUP_STATUS_FLAG_INCONSISTENT;
2656 }
2657 mutex_unlock(&fs_info->qgroup_rescan_lock);
2658
2659 /*
2660 * only update status, since the previous part has already updated the
2661 * qgroup info.
2662 */
2663 trans = btrfs_start_transaction(fs_info->quota_root, 1);
2664 if (IS_ERR(trans)) {
2665 err = PTR_ERR(trans);
2666 btrfs_err(fs_info,
2667 "fail to start transaction for status update: %d",
2668 err);
2669 goto done;
2670 }
2671 ret = update_qgroup_status_item(trans, fs_info, fs_info->quota_root);
2672 if (ret < 0) {
2673 err = ret;
2674 btrfs_err(fs_info, "fail to update qgroup status: %d", err);
2675 }
2676 btrfs_end_transaction(trans);
2677
2678 if (btrfs_fs_closing(fs_info)) {
2679 btrfs_info(fs_info, "qgroup scan paused");
2680 } else if (err >= 0) {
2681 btrfs_info(fs_info, "qgroup scan completed%s",
2682 err > 0 ? " (inconsistency flag cleared)" : "");
2683 } else {
2684 btrfs_err(fs_info, "qgroup scan failed with %d", err);
2685 }
2686
2687 done:
2688 mutex_lock(&fs_info->qgroup_rescan_lock);
2689 fs_info->qgroup_rescan_running = false;
2690 mutex_unlock(&fs_info->qgroup_rescan_lock);
2691 complete_all(&fs_info->qgroup_rescan_completion);
2692 }
2693
2694 /*
2695 * Checks that (a) no rescan is running and (b) quota is enabled. Allocates all
2696 * memory required for the rescan context.
2697 */
2698 static int
2699 qgroup_rescan_init(struct btrfs_fs_info *fs_info, u64 progress_objectid,
2700 int init_flags)
2701 {
2702 int ret = 0;
2703
2704 if (!init_flags &&
2705 (!(fs_info->qgroup_flags & BTRFS_QGROUP_STATUS_FLAG_RESCAN) ||
2706 !(fs_info->qgroup_flags & BTRFS_QGROUP_STATUS_FLAG_ON))) {
2707 ret = -EINVAL;
2708 goto err;
2709 }
2710
2711 mutex_lock(&fs_info->qgroup_rescan_lock);
2712 spin_lock(&fs_info->qgroup_lock);
2713
2714 if (init_flags) {
2715 if (fs_info->qgroup_flags & BTRFS_QGROUP_STATUS_FLAG_RESCAN)
2716 ret = -EINPROGRESS;
2717 else if (!(fs_info->qgroup_flags & BTRFS_QGROUP_STATUS_FLAG_ON))
2718 ret = -EINVAL;
2719
2720 if (ret) {
2721 spin_unlock(&fs_info->qgroup_lock);
2722 mutex_unlock(&fs_info->qgroup_rescan_lock);
2723 goto err;
2724 }
2725 fs_info->qgroup_flags |= BTRFS_QGROUP_STATUS_FLAG_RESCAN;
2726 }
2727
2728 memset(&fs_info->qgroup_rescan_progress, 0,
2729 sizeof(fs_info->qgroup_rescan_progress));
2730 fs_info->qgroup_rescan_progress.objectid = progress_objectid;
2731 init_completion(&fs_info->qgroup_rescan_completion);
2732 fs_info->qgroup_rescan_running = true;
2733
2734 spin_unlock(&fs_info->qgroup_lock);
2735 mutex_unlock(&fs_info->qgroup_rescan_lock);
2736
2737 memset(&fs_info->qgroup_rescan_work, 0,
2738 sizeof(fs_info->qgroup_rescan_work));
2739 btrfs_init_work(&fs_info->qgroup_rescan_work,
2740 btrfs_qgroup_rescan_helper,
2741 btrfs_qgroup_rescan_worker, NULL, NULL);
2742
2743 if (ret) {
2744 err:
2745 btrfs_info(fs_info, "qgroup_rescan_init failed with %d", ret);
2746 return ret;
2747 }
2748
2749 return 0;
2750 }
2751
2752 static void
2753 qgroup_rescan_zero_tracking(struct btrfs_fs_info *fs_info)
2754 {
2755 struct rb_node *n;
2756 struct btrfs_qgroup *qgroup;
2757
2758 spin_lock(&fs_info->qgroup_lock);
2759 /* clear all current qgroup tracking information */
2760 for (n = rb_first(&fs_info->qgroup_tree); n; n = rb_next(n)) {
2761 qgroup = rb_entry(n, struct btrfs_qgroup, node);
2762 qgroup->rfer = 0;
2763 qgroup->rfer_cmpr = 0;
2764 qgroup->excl = 0;
2765 qgroup->excl_cmpr = 0;
2766 }
2767 spin_unlock(&fs_info->qgroup_lock);
2768 }
2769
2770 int
2771 btrfs_qgroup_rescan(struct btrfs_fs_info *fs_info)
2772 {
2773 int ret = 0;
2774 struct btrfs_trans_handle *trans;
2775
2776 ret = qgroup_rescan_init(fs_info, 0, 1);
2777 if (ret)
2778 return ret;
2779
2780 /*
2781 * We have set the rescan_progress to 0, which means no more
2782 * delayed refs will be accounted by btrfs_qgroup_account_ref.
2783 * However, btrfs_qgroup_account_ref may be right after its call
2784 * to btrfs_find_all_roots, in which case it would still do the
2785 * accounting.
2786 * To solve this, we're committing the transaction, which will
2787 * ensure we run all delayed refs and only after that, we are
2788 * going to clear all tracking information for a clean start.
2789 */
2790
2791 trans = btrfs_join_transaction(fs_info->fs_root);
2792 if (IS_ERR(trans)) {
2793 fs_info->qgroup_flags &= ~BTRFS_QGROUP_STATUS_FLAG_RESCAN;
2794 return PTR_ERR(trans);
2795 }
2796 ret = btrfs_commit_transaction(trans);
2797 if (ret) {
2798 fs_info->qgroup_flags &= ~BTRFS_QGROUP_STATUS_FLAG_RESCAN;
2799 return ret;
2800 }
2801
2802 qgroup_rescan_zero_tracking(fs_info);
2803
2804 btrfs_queue_work(fs_info->qgroup_rescan_workers,
2805 &fs_info->qgroup_rescan_work);
2806
2807 return 0;
2808 }
2809
2810 int btrfs_qgroup_wait_for_completion(struct btrfs_fs_info *fs_info,
2811 bool interruptible)
2812 {
2813 int running;
2814 int ret = 0;
2815
2816 mutex_lock(&fs_info->qgroup_rescan_lock);
2817 spin_lock(&fs_info->qgroup_lock);
2818 running = fs_info->qgroup_rescan_running;
2819 spin_unlock(&fs_info->qgroup_lock);
2820 mutex_unlock(&fs_info->qgroup_rescan_lock);
2821
2822 if (!running)
2823 return 0;
2824
2825 if (interruptible)
2826 ret = wait_for_completion_interruptible(
2827 &fs_info->qgroup_rescan_completion);
2828 else
2829 wait_for_completion(&fs_info->qgroup_rescan_completion);
2830
2831 return ret;
2832 }
2833
2834 /*
2835 * this is only called from open_ctree where we're still single threaded, thus
2836 * locking is omitted here.
2837 */
2838 void
2839 btrfs_qgroup_rescan_resume(struct btrfs_fs_info *fs_info)
2840 {
2841 if (fs_info->qgroup_flags & BTRFS_QGROUP_STATUS_FLAG_RESCAN)
2842 btrfs_queue_work(fs_info->qgroup_rescan_workers,
2843 &fs_info->qgroup_rescan_work);
2844 }
2845
2846 /*
2847 * Reserve qgroup space for range [start, start + len).
2848 *
2849 * This function will either reserve space from related qgroups or doing
2850 * nothing if the range is already reserved.
2851 *
2852 * Return 0 for successful reserve
2853 * Return <0 for error (including -EQUOT)
2854 *
2855 * NOTE: this function may sleep for memory allocation.
2856 * if btrfs_qgroup_reserve_data() is called multiple times with
2857 * same @reserved, caller must ensure when error happens it's OK
2858 * to free *ALL* reserved space.
2859 */
2860 int btrfs_qgroup_reserve_data(struct inode *inode,
2861 struct extent_changeset **reserved_ret, u64 start,
2862 u64 len)
2863 {
2864 struct btrfs_root *root = BTRFS_I(inode)->root;
2865 struct ulist_node *unode;
2866 struct ulist_iterator uiter;
2867 struct extent_changeset *reserved;
2868 u64 orig_reserved;
2869 u64 to_reserve;
2870 int ret;
2871
2872 if (!test_bit(BTRFS_FS_QUOTA_ENABLED, &root->fs_info->flags) ||
2873 !is_fstree(root->objectid) || len == 0)
2874 return 0;
2875
2876 /* @reserved parameter is mandatory for qgroup */
2877 if (WARN_ON(!reserved_ret))
2878 return -EINVAL;
2879 if (!*reserved_ret) {
2880 *reserved_ret = extent_changeset_alloc();
2881 if (!*reserved_ret)
2882 return -ENOMEM;
2883 }
2884 reserved = *reserved_ret;
2885 /* Record already reserved space */
2886 orig_reserved = reserved->bytes_changed;
2887 ret = set_record_extent_bits(&BTRFS_I(inode)->io_tree, start,
2888 start + len -1, EXTENT_QGROUP_RESERVED, reserved);
2889
2890 /* Newly reserved space */
2891 to_reserve = reserved->bytes_changed - orig_reserved;
2892 trace_btrfs_qgroup_reserve_data(inode, start, len,
2893 to_reserve, QGROUP_RESERVE);
2894 if (ret < 0)
2895 goto cleanup;
2896 ret = qgroup_reserve(root, to_reserve, true);
2897 if (ret < 0)
2898 goto cleanup;
2899
2900 return ret;
2901
2902 cleanup:
2903 /* cleanup *ALL* already reserved ranges */
2904 ULIST_ITER_INIT(&uiter);
2905 while ((unode = ulist_next(&reserved->range_changed, &uiter)))
2906 clear_extent_bit(&BTRFS_I(inode)->io_tree, unode->val,
2907 unode->aux, EXTENT_QGROUP_RESERVED, 0, 0, NULL,
2908 GFP_NOFS);
2909 extent_changeset_release(reserved);
2910 return ret;
2911 }
2912
2913 /* Free ranges specified by @reserved, normally in error path */
2914 static int qgroup_free_reserved_data(struct inode *inode,
2915 struct extent_changeset *reserved, u64 start, u64 len)
2916 {
2917 struct btrfs_root *root = BTRFS_I(inode)->root;
2918 struct ulist_node *unode;
2919 struct ulist_iterator uiter;
2920 struct extent_changeset changeset;
2921 int freed = 0;
2922 int ret;
2923
2924 extent_changeset_init(&changeset);
2925 len = round_up(start + len, root->fs_info->sectorsize);
2926 start = round_down(start, root->fs_info->sectorsize);
2927
2928 ULIST_ITER_INIT(&uiter);
2929 while ((unode = ulist_next(&reserved->range_changed, &uiter))) {
2930 u64 range_start = unode->val;
2931 /* unode->aux is the inclusive end */
2932 u64 range_len = unode->aux - range_start + 1;
2933 u64 free_start;
2934 u64 free_len;
2935
2936 extent_changeset_release(&changeset);
2937
2938 /* Only free range in range [start, start + len) */
2939 if (range_start >= start + len ||
2940 range_start + range_len <= start)
2941 continue;
2942 free_start = max(range_start, start);
2943 free_len = min(start + len, range_start + range_len) -
2944 free_start;
2945 /*
2946 * TODO: To also modify reserved->ranges_reserved to reflect
2947 * the modification.
2948 *
2949 * However as long as we free qgroup reserved according to
2950 * EXTENT_QGROUP_RESERVED, we won't double free.
2951 * So not need to rush.
2952 */
2953 ret = clear_record_extent_bits(&BTRFS_I(inode)->io_failure_tree,
2954 free_start, free_start + free_len - 1,
2955 EXTENT_QGROUP_RESERVED, &changeset);
2956 if (ret < 0)
2957 goto out;
2958 freed += changeset.bytes_changed;
2959 }
2960 btrfs_qgroup_free_refroot(root->fs_info, root->objectid, freed);
2961 ret = freed;
2962 out:
2963 extent_changeset_release(&changeset);
2964 return ret;
2965 }
2966
2967 static int __btrfs_qgroup_release_data(struct inode *inode,
2968 struct extent_changeset *reserved, u64 start, u64 len,
2969 int free)
2970 {
2971 struct extent_changeset changeset;
2972 int trace_op = QGROUP_RELEASE;
2973 int ret;
2974
2975 /* In release case, we shouldn't have @reserved */
2976 WARN_ON(!free && reserved);
2977 if (free && reserved)
2978 return qgroup_free_reserved_data(inode, reserved, start, len);
2979 extent_changeset_init(&changeset);
2980 ret = clear_record_extent_bits(&BTRFS_I(inode)->io_tree, start,
2981 start + len -1, EXTENT_QGROUP_RESERVED, &changeset);
2982 if (ret < 0)
2983 goto out;
2984
2985 if (free)
2986 trace_op = QGROUP_FREE;
2987 trace_btrfs_qgroup_release_data(inode, start, len,
2988 changeset.bytes_changed, trace_op);
2989 if (free)
2990 btrfs_qgroup_free_refroot(BTRFS_I(inode)->root->fs_info,
2991 BTRFS_I(inode)->root->objectid,
2992 changeset.bytes_changed);
2993 ret = changeset.bytes_changed;
2994 out:
2995 extent_changeset_release(&changeset);
2996 return ret;
2997 }
2998
2999 /*
3000 * Free a reserved space range from io_tree and related qgroups
3001 *
3002 * Should be called when a range of pages get invalidated before reaching disk.
3003 * Or for error cleanup case.
3004 * if @reserved is given, only reserved range in [@start, @start + @len) will
3005 * be freed.
3006 *
3007 * For data written to disk, use btrfs_qgroup_release_data().
3008 *
3009 * NOTE: This function may sleep for memory allocation.
3010 */
3011 int btrfs_qgroup_free_data(struct inode *inode,
3012 struct extent_changeset *reserved, u64 start, u64 len)
3013 {
3014 return __btrfs_qgroup_release_data(inode, reserved, start, len, 1);
3015 }
3016
3017 /*
3018 * Release a reserved space range from io_tree only.
3019 *
3020 * Should be called when a range of pages get written to disk and corresponding
3021 * FILE_EXTENT is inserted into corresponding root.
3022 *
3023 * Since new qgroup accounting framework will only update qgroup numbers at
3024 * commit_transaction() time, its reserved space shouldn't be freed from
3025 * related qgroups.
3026 *
3027 * But we should release the range from io_tree, to allow further write to be
3028 * COWed.
3029 *
3030 * NOTE: This function may sleep for memory allocation.
3031 */
3032 int btrfs_qgroup_release_data(struct inode *inode, u64 start, u64 len)
3033 {
3034 return __btrfs_qgroup_release_data(inode, NULL, start, len, 0);
3035 }
3036
3037 int btrfs_qgroup_reserve_meta(struct btrfs_root *root, int num_bytes,
3038 bool enforce)
3039 {
3040 struct btrfs_fs_info *fs_info = root->fs_info;
3041 int ret;
3042
3043 if (!test_bit(BTRFS_FS_QUOTA_ENABLED, &fs_info->flags) ||
3044 !is_fstree(root->objectid) || num_bytes == 0)
3045 return 0;
3046
3047 BUG_ON(num_bytes != round_down(num_bytes, fs_info->nodesize));
3048 trace_qgroup_meta_reserve(root, (s64)num_bytes);
3049 ret = qgroup_reserve(root, num_bytes, enforce);
3050 if (ret < 0)
3051 return ret;
3052 atomic64_add(num_bytes, &root->qgroup_meta_rsv);
3053 return ret;
3054 }
3055
3056 void btrfs_qgroup_free_meta_all(struct btrfs_root *root)
3057 {
3058 struct btrfs_fs_info *fs_info = root->fs_info;
3059 u64 reserved;
3060
3061 if (!test_bit(BTRFS_FS_QUOTA_ENABLED, &fs_info->flags) ||
3062 !is_fstree(root->objectid))
3063 return;
3064
3065 reserved = atomic64_xchg(&root->qgroup_meta_rsv, 0);
3066 if (reserved == 0)
3067 return;
3068 trace_qgroup_meta_reserve(root, -(s64)reserved);
3069 btrfs_qgroup_free_refroot(fs_info, root->objectid, reserved);
3070 }
3071
3072 void btrfs_qgroup_free_meta(struct btrfs_root *root, int num_bytes)
3073 {
3074 struct btrfs_fs_info *fs_info = root->fs_info;
3075
3076 if (!test_bit(BTRFS_FS_QUOTA_ENABLED, &fs_info->flags) ||
3077 !is_fstree(root->objectid))
3078 return;
3079
3080 BUG_ON(num_bytes != round_down(num_bytes, fs_info->nodesize));
3081 WARN_ON(atomic64_read(&root->qgroup_meta_rsv) < num_bytes);
3082 atomic64_sub(num_bytes, &root->qgroup_meta_rsv);
3083 trace_qgroup_meta_reserve(root, -(s64)num_bytes);
3084 btrfs_qgroup_free_refroot(fs_info, root->objectid, num_bytes);
3085 }
3086
3087 /*
3088 * Check qgroup reserved space leaking, normally at destroy inode
3089 * time
3090 */
3091 void btrfs_qgroup_check_reserved_leak(struct inode *inode)
3092 {
3093 struct extent_changeset changeset;
3094 struct ulist_node *unode;
3095 struct ulist_iterator iter;
3096 int ret;
3097
3098 extent_changeset_init(&changeset);
3099 ret = clear_record_extent_bits(&BTRFS_I(inode)->io_tree, 0, (u64)-1,
3100 EXTENT_QGROUP_RESERVED, &changeset);
3101
3102 WARN_ON(ret < 0);
3103 if (WARN_ON(changeset.bytes_changed)) {
3104 ULIST_ITER_INIT(&iter);
3105 while ((unode = ulist_next(&changeset.range_changed, &iter))) {
3106 btrfs_warn(BTRFS_I(inode)->root->fs_info,
3107 "leaking qgroup reserved space, ino: %lu, start: %llu, end: %llu",
3108 inode->i_ino, unode->val, unode->aux);
3109 }
3110 btrfs_qgroup_free_refroot(BTRFS_I(inode)->root->fs_info,
3111 BTRFS_I(inode)->root->objectid,
3112 changeset.bytes_changed);
3113
3114 }
3115 extent_changeset_release(&changeset);
3116 }
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