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Merge tag 'csky-for-linus-5.6-rc3' of git://github.com/c-sky/csky-linux
[mirror_ubuntu-jammy-kernel.git] / fs / btrfs / qgroup.c
1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Copyright (C) 2011 STRATO. All rights reserved.
4 */
5
6 #include <linux/sched.h>
7 #include <linux/pagemap.h>
8 #include <linux/writeback.h>
9 #include <linux/blkdev.h>
10 #include <linux/rbtree.h>
11 #include <linux/slab.h>
12 #include <linux/workqueue.h>
13 #include <linux/btrfs.h>
14 #include <linux/sizes.h>
15
16 #include "ctree.h"
17 #include "transaction.h"
18 #include "disk-io.h"
19 #include "locking.h"
20 #include "ulist.h"
21 #include "backref.h"
22 #include "extent_io.h"
23 #include "qgroup.h"
24 #include "block-group.h"
25
26 /* TODO XXX FIXME
27 * - subvol delete -> delete when ref goes to 0? delete limits also?
28 * - reorganize keys
29 * - compressed
30 * - sync
31 * - copy also limits on subvol creation
32 * - limit
33 * - caches for ulists
34 * - performance benchmarks
35 * - check all ioctl parameters
36 */
37
38 /*
39 * Helpers to access qgroup reservation
40 *
41 * Callers should ensure the lock context and type are valid
42 */
43
44 static u64 qgroup_rsv_total(const struct btrfs_qgroup *qgroup)
45 {
46 u64 ret = 0;
47 int i;
48
49 for (i = 0; i < BTRFS_QGROUP_RSV_LAST; i++)
50 ret += qgroup->rsv.values[i];
51
52 return ret;
53 }
54
55 #ifdef CONFIG_BTRFS_DEBUG
56 static const char *qgroup_rsv_type_str(enum btrfs_qgroup_rsv_type type)
57 {
58 if (type == BTRFS_QGROUP_RSV_DATA)
59 return "data";
60 if (type == BTRFS_QGROUP_RSV_META_PERTRANS)
61 return "meta_pertrans";
62 if (type == BTRFS_QGROUP_RSV_META_PREALLOC)
63 return "meta_prealloc";
64 return NULL;
65 }
66 #endif
67
68 static void qgroup_rsv_add(struct btrfs_fs_info *fs_info,
69 struct btrfs_qgroup *qgroup, u64 num_bytes,
70 enum btrfs_qgroup_rsv_type type)
71 {
72 trace_qgroup_update_reserve(fs_info, qgroup, num_bytes, type);
73 qgroup->rsv.values[type] += num_bytes;
74 }
75
76 static void qgroup_rsv_release(struct btrfs_fs_info *fs_info,
77 struct btrfs_qgroup *qgroup, u64 num_bytes,
78 enum btrfs_qgroup_rsv_type type)
79 {
80 trace_qgroup_update_reserve(fs_info, qgroup, -(s64)num_bytes, type);
81 if (qgroup->rsv.values[type] >= num_bytes) {
82 qgroup->rsv.values[type] -= num_bytes;
83 return;
84 }
85 #ifdef CONFIG_BTRFS_DEBUG
86 WARN_RATELIMIT(1,
87 "qgroup %llu %s reserved space underflow, have %llu to free %llu",
88 qgroup->qgroupid, qgroup_rsv_type_str(type),
89 qgroup->rsv.values[type], num_bytes);
90 #endif
91 qgroup->rsv.values[type] = 0;
92 }
93
94 static void qgroup_rsv_add_by_qgroup(struct btrfs_fs_info *fs_info,
95 struct btrfs_qgroup *dest,
96 struct btrfs_qgroup *src)
97 {
98 int i;
99
100 for (i = 0; i < BTRFS_QGROUP_RSV_LAST; i++)
101 qgroup_rsv_add(fs_info, dest, src->rsv.values[i], i);
102 }
103
104 static void qgroup_rsv_release_by_qgroup(struct btrfs_fs_info *fs_info,
105 struct btrfs_qgroup *dest,
106 struct btrfs_qgroup *src)
107 {
108 int i;
109
110 for (i = 0; i < BTRFS_QGROUP_RSV_LAST; i++)
111 qgroup_rsv_release(fs_info, dest, src->rsv.values[i], i);
112 }
113
114 static void btrfs_qgroup_update_old_refcnt(struct btrfs_qgroup *qg, u64 seq,
115 int mod)
116 {
117 if (qg->old_refcnt < seq)
118 qg->old_refcnt = seq;
119 qg->old_refcnt += mod;
120 }
121
122 static void btrfs_qgroup_update_new_refcnt(struct btrfs_qgroup *qg, u64 seq,
123 int mod)
124 {
125 if (qg->new_refcnt < seq)
126 qg->new_refcnt = seq;
127 qg->new_refcnt += mod;
128 }
129
130 static inline u64 btrfs_qgroup_get_old_refcnt(struct btrfs_qgroup *qg, u64 seq)
131 {
132 if (qg->old_refcnt < seq)
133 return 0;
134 return qg->old_refcnt - seq;
135 }
136
137 static inline u64 btrfs_qgroup_get_new_refcnt(struct btrfs_qgroup *qg, u64 seq)
138 {
139 if (qg->new_refcnt < seq)
140 return 0;
141 return qg->new_refcnt - seq;
142 }
143
144 /*
145 * glue structure to represent the relations between qgroups.
146 */
147 struct btrfs_qgroup_list {
148 struct list_head next_group;
149 struct list_head next_member;
150 struct btrfs_qgroup *group;
151 struct btrfs_qgroup *member;
152 };
153
154 static inline u64 qgroup_to_aux(struct btrfs_qgroup *qg)
155 {
156 return (u64)(uintptr_t)qg;
157 }
158
159 static inline struct btrfs_qgroup* unode_aux_to_qgroup(struct ulist_node *n)
160 {
161 return (struct btrfs_qgroup *)(uintptr_t)n->aux;
162 }
163
164 static int
165 qgroup_rescan_init(struct btrfs_fs_info *fs_info, u64 progress_objectid,
166 int init_flags);
167 static void qgroup_rescan_zero_tracking(struct btrfs_fs_info *fs_info);
168
169 /* must be called with qgroup_ioctl_lock held */
170 static struct btrfs_qgroup *find_qgroup_rb(struct btrfs_fs_info *fs_info,
171 u64 qgroupid)
172 {
173 struct rb_node *n = fs_info->qgroup_tree.rb_node;
174 struct btrfs_qgroup *qgroup;
175
176 while (n) {
177 qgroup = rb_entry(n, struct btrfs_qgroup, node);
178 if (qgroup->qgroupid < qgroupid)
179 n = n->rb_left;
180 else if (qgroup->qgroupid > qgroupid)
181 n = n->rb_right;
182 else
183 return qgroup;
184 }
185 return NULL;
186 }
187
188 /* must be called with qgroup_lock held */
189 static struct btrfs_qgroup *add_qgroup_rb(struct btrfs_fs_info *fs_info,
190 u64 qgroupid)
191 {
192 struct rb_node **p = &fs_info->qgroup_tree.rb_node;
193 struct rb_node *parent = NULL;
194 struct btrfs_qgroup *qgroup;
195
196 while (*p) {
197 parent = *p;
198 qgroup = rb_entry(parent, struct btrfs_qgroup, node);
199
200 if (qgroup->qgroupid < qgroupid)
201 p = &(*p)->rb_left;
202 else if (qgroup->qgroupid > qgroupid)
203 p = &(*p)->rb_right;
204 else
205 return qgroup;
206 }
207
208 qgroup = kzalloc(sizeof(*qgroup), GFP_ATOMIC);
209 if (!qgroup)
210 return ERR_PTR(-ENOMEM);
211
212 qgroup->qgroupid = qgroupid;
213 INIT_LIST_HEAD(&qgroup->groups);
214 INIT_LIST_HEAD(&qgroup->members);
215 INIT_LIST_HEAD(&qgroup->dirty);
216
217 rb_link_node(&qgroup->node, parent, p);
218 rb_insert_color(&qgroup->node, &fs_info->qgroup_tree);
219
220 return qgroup;
221 }
222
223 static void __del_qgroup_rb(struct btrfs_qgroup *qgroup)
224 {
225 struct btrfs_qgroup_list *list;
226
227 list_del(&qgroup->dirty);
228 while (!list_empty(&qgroup->groups)) {
229 list = list_first_entry(&qgroup->groups,
230 struct btrfs_qgroup_list, next_group);
231 list_del(&list->next_group);
232 list_del(&list->next_member);
233 kfree(list);
234 }
235
236 while (!list_empty(&qgroup->members)) {
237 list = list_first_entry(&qgroup->members,
238 struct btrfs_qgroup_list, next_member);
239 list_del(&list->next_group);
240 list_del(&list->next_member);
241 kfree(list);
242 }
243 kfree(qgroup);
244 }
245
246 /* must be called with qgroup_lock held */
247 static int del_qgroup_rb(struct btrfs_fs_info *fs_info, u64 qgroupid)
248 {
249 struct btrfs_qgroup *qgroup = find_qgroup_rb(fs_info, qgroupid);
250
251 if (!qgroup)
252 return -ENOENT;
253
254 rb_erase(&qgroup->node, &fs_info->qgroup_tree);
255 __del_qgroup_rb(qgroup);
256 return 0;
257 }
258
259 /* must be called with qgroup_lock held */
260 static int add_relation_rb(struct btrfs_fs_info *fs_info,
261 u64 memberid, u64 parentid)
262 {
263 struct btrfs_qgroup *member;
264 struct btrfs_qgroup *parent;
265 struct btrfs_qgroup_list *list;
266
267 member = find_qgroup_rb(fs_info, memberid);
268 parent = find_qgroup_rb(fs_info, parentid);
269 if (!member || !parent)
270 return -ENOENT;
271
272 list = kzalloc(sizeof(*list), GFP_ATOMIC);
273 if (!list)
274 return -ENOMEM;
275
276 list->group = parent;
277 list->member = member;
278 list_add_tail(&list->next_group, &member->groups);
279 list_add_tail(&list->next_member, &parent->members);
280
281 return 0;
282 }
283
284 /* must be called with qgroup_lock held */
285 static int del_relation_rb(struct btrfs_fs_info *fs_info,
286 u64 memberid, u64 parentid)
287 {
288 struct btrfs_qgroup *member;
289 struct btrfs_qgroup *parent;
290 struct btrfs_qgroup_list *list;
291
292 member = find_qgroup_rb(fs_info, memberid);
293 parent = find_qgroup_rb(fs_info, parentid);
294 if (!member || !parent)
295 return -ENOENT;
296
297 list_for_each_entry(list, &member->groups, next_group) {
298 if (list->group == parent) {
299 list_del(&list->next_group);
300 list_del(&list->next_member);
301 kfree(list);
302 return 0;
303 }
304 }
305 return -ENOENT;
306 }
307
308 #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
309 int btrfs_verify_qgroup_counts(struct btrfs_fs_info *fs_info, u64 qgroupid,
310 u64 rfer, u64 excl)
311 {
312 struct btrfs_qgroup *qgroup;
313
314 qgroup = find_qgroup_rb(fs_info, qgroupid);
315 if (!qgroup)
316 return -EINVAL;
317 if (qgroup->rfer != rfer || qgroup->excl != excl)
318 return -EINVAL;
319 return 0;
320 }
321 #endif
322
323 /*
324 * The full config is read in one go, only called from open_ctree()
325 * It doesn't use any locking, as at this point we're still single-threaded
326 */
327 int btrfs_read_qgroup_config(struct btrfs_fs_info *fs_info)
328 {
329 struct btrfs_key key;
330 struct btrfs_key found_key;
331 struct btrfs_root *quota_root = fs_info->quota_root;
332 struct btrfs_path *path = NULL;
333 struct extent_buffer *l;
334 int slot;
335 int ret = 0;
336 u64 flags = 0;
337 u64 rescan_progress = 0;
338
339 if (!test_bit(BTRFS_FS_QUOTA_ENABLED, &fs_info->flags))
340 return 0;
341
342 fs_info->qgroup_ulist = ulist_alloc(GFP_KERNEL);
343 if (!fs_info->qgroup_ulist) {
344 ret = -ENOMEM;
345 goto out;
346 }
347
348 path = btrfs_alloc_path();
349 if (!path) {
350 ret = -ENOMEM;
351 goto out;
352 }
353
354 /* default this to quota off, in case no status key is found */
355 fs_info->qgroup_flags = 0;
356
357 /*
358 * pass 1: read status, all qgroup infos and limits
359 */
360 key.objectid = 0;
361 key.type = 0;
362 key.offset = 0;
363 ret = btrfs_search_slot_for_read(quota_root, &key, path, 1, 1);
364 if (ret)
365 goto out;
366
367 while (1) {
368 struct btrfs_qgroup *qgroup;
369
370 slot = path->slots[0];
371 l = path->nodes[0];
372 btrfs_item_key_to_cpu(l, &found_key, slot);
373
374 if (found_key.type == BTRFS_QGROUP_STATUS_KEY) {
375 struct btrfs_qgroup_status_item *ptr;
376
377 ptr = btrfs_item_ptr(l, slot,
378 struct btrfs_qgroup_status_item);
379
380 if (btrfs_qgroup_status_version(l, ptr) !=
381 BTRFS_QGROUP_STATUS_VERSION) {
382 btrfs_err(fs_info,
383 "old qgroup version, quota disabled");
384 goto out;
385 }
386 if (btrfs_qgroup_status_generation(l, ptr) !=
387 fs_info->generation) {
388 flags |= BTRFS_QGROUP_STATUS_FLAG_INCONSISTENT;
389 btrfs_err(fs_info,
390 "qgroup generation mismatch, marked as inconsistent");
391 }
392 fs_info->qgroup_flags = btrfs_qgroup_status_flags(l,
393 ptr);
394 rescan_progress = btrfs_qgroup_status_rescan(l, ptr);
395 goto next1;
396 }
397
398 if (found_key.type != BTRFS_QGROUP_INFO_KEY &&
399 found_key.type != BTRFS_QGROUP_LIMIT_KEY)
400 goto next1;
401
402 qgroup = find_qgroup_rb(fs_info, found_key.offset);
403 if ((qgroup && found_key.type == BTRFS_QGROUP_INFO_KEY) ||
404 (!qgroup && found_key.type == BTRFS_QGROUP_LIMIT_KEY)) {
405 btrfs_err(fs_info, "inconsistent qgroup config");
406 flags |= BTRFS_QGROUP_STATUS_FLAG_INCONSISTENT;
407 }
408 if (!qgroup) {
409 qgroup = add_qgroup_rb(fs_info, found_key.offset);
410 if (IS_ERR(qgroup)) {
411 ret = PTR_ERR(qgroup);
412 goto out;
413 }
414 }
415 switch (found_key.type) {
416 case BTRFS_QGROUP_INFO_KEY: {
417 struct btrfs_qgroup_info_item *ptr;
418
419 ptr = btrfs_item_ptr(l, slot,
420 struct btrfs_qgroup_info_item);
421 qgroup->rfer = btrfs_qgroup_info_rfer(l, ptr);
422 qgroup->rfer_cmpr = btrfs_qgroup_info_rfer_cmpr(l, ptr);
423 qgroup->excl = btrfs_qgroup_info_excl(l, ptr);
424 qgroup->excl_cmpr = btrfs_qgroup_info_excl_cmpr(l, ptr);
425 /* generation currently unused */
426 break;
427 }
428 case BTRFS_QGROUP_LIMIT_KEY: {
429 struct btrfs_qgroup_limit_item *ptr;
430
431 ptr = btrfs_item_ptr(l, slot,
432 struct btrfs_qgroup_limit_item);
433 qgroup->lim_flags = btrfs_qgroup_limit_flags(l, ptr);
434 qgroup->max_rfer = btrfs_qgroup_limit_max_rfer(l, ptr);
435 qgroup->max_excl = btrfs_qgroup_limit_max_excl(l, ptr);
436 qgroup->rsv_rfer = btrfs_qgroup_limit_rsv_rfer(l, ptr);
437 qgroup->rsv_excl = btrfs_qgroup_limit_rsv_excl(l, ptr);
438 break;
439 }
440 }
441 next1:
442 ret = btrfs_next_item(quota_root, path);
443 if (ret < 0)
444 goto out;
445 if (ret)
446 break;
447 }
448 btrfs_release_path(path);
449
450 /*
451 * pass 2: read all qgroup relations
452 */
453 key.objectid = 0;
454 key.type = BTRFS_QGROUP_RELATION_KEY;
455 key.offset = 0;
456 ret = btrfs_search_slot_for_read(quota_root, &key, path, 1, 0);
457 if (ret)
458 goto out;
459 while (1) {
460 slot = path->slots[0];
461 l = path->nodes[0];
462 btrfs_item_key_to_cpu(l, &found_key, slot);
463
464 if (found_key.type != BTRFS_QGROUP_RELATION_KEY)
465 goto next2;
466
467 if (found_key.objectid > found_key.offset) {
468 /* parent <- member, not needed to build config */
469 /* FIXME should we omit the key completely? */
470 goto next2;
471 }
472
473 ret = add_relation_rb(fs_info, found_key.objectid,
474 found_key.offset);
475 if (ret == -ENOENT) {
476 btrfs_warn(fs_info,
477 "orphan qgroup relation 0x%llx->0x%llx",
478 found_key.objectid, found_key.offset);
479 ret = 0; /* ignore the error */
480 }
481 if (ret)
482 goto out;
483 next2:
484 ret = btrfs_next_item(quota_root, path);
485 if (ret < 0)
486 goto out;
487 if (ret)
488 break;
489 }
490 out:
491 fs_info->qgroup_flags |= flags;
492 if (!(fs_info->qgroup_flags & BTRFS_QGROUP_STATUS_FLAG_ON))
493 clear_bit(BTRFS_FS_QUOTA_ENABLED, &fs_info->flags);
494 else if (fs_info->qgroup_flags & BTRFS_QGROUP_STATUS_FLAG_RESCAN &&
495 ret >= 0)
496 ret = qgroup_rescan_init(fs_info, rescan_progress, 0);
497 btrfs_free_path(path);
498
499 if (ret < 0) {
500 ulist_free(fs_info->qgroup_ulist);
501 fs_info->qgroup_ulist = NULL;
502 fs_info->qgroup_flags &= ~BTRFS_QGROUP_STATUS_FLAG_RESCAN;
503 }
504
505 return ret < 0 ? ret : 0;
506 }
507
508 /*
509 * This is called from close_ctree() or open_ctree() or btrfs_quota_disable(),
510 * first two are in single-threaded paths.And for the third one, we have set
511 * quota_root to be null with qgroup_lock held before, so it is safe to clean
512 * up the in-memory structures without qgroup_lock held.
513 */
514 void btrfs_free_qgroup_config(struct btrfs_fs_info *fs_info)
515 {
516 struct rb_node *n;
517 struct btrfs_qgroup *qgroup;
518
519 while ((n = rb_first(&fs_info->qgroup_tree))) {
520 qgroup = rb_entry(n, struct btrfs_qgroup, node);
521 rb_erase(n, &fs_info->qgroup_tree);
522 __del_qgroup_rb(qgroup);
523 }
524 /*
525 * We call btrfs_free_qgroup_config() when unmounting
526 * filesystem and disabling quota, so we set qgroup_ulist
527 * to be null here to avoid double free.
528 */
529 ulist_free(fs_info->qgroup_ulist);
530 fs_info->qgroup_ulist = NULL;
531 }
532
533 static int add_qgroup_relation_item(struct btrfs_trans_handle *trans, u64 src,
534 u64 dst)
535 {
536 int ret;
537 struct btrfs_root *quota_root = trans->fs_info->quota_root;
538 struct btrfs_path *path;
539 struct btrfs_key key;
540
541 path = btrfs_alloc_path();
542 if (!path)
543 return -ENOMEM;
544
545 key.objectid = src;
546 key.type = BTRFS_QGROUP_RELATION_KEY;
547 key.offset = dst;
548
549 ret = btrfs_insert_empty_item(trans, quota_root, path, &key, 0);
550
551 btrfs_mark_buffer_dirty(path->nodes[0]);
552
553 btrfs_free_path(path);
554 return ret;
555 }
556
557 static int del_qgroup_relation_item(struct btrfs_trans_handle *trans, u64 src,
558 u64 dst)
559 {
560 int ret;
561 struct btrfs_root *quota_root = trans->fs_info->quota_root;
562 struct btrfs_path *path;
563 struct btrfs_key key;
564
565 path = btrfs_alloc_path();
566 if (!path)
567 return -ENOMEM;
568
569 key.objectid = src;
570 key.type = BTRFS_QGROUP_RELATION_KEY;
571 key.offset = dst;
572
573 ret = btrfs_search_slot(trans, quota_root, &key, path, -1, 1);
574 if (ret < 0)
575 goto out;
576
577 if (ret > 0) {
578 ret = -ENOENT;
579 goto out;
580 }
581
582 ret = btrfs_del_item(trans, quota_root, path);
583 out:
584 btrfs_free_path(path);
585 return ret;
586 }
587
588 static int add_qgroup_item(struct btrfs_trans_handle *trans,
589 struct btrfs_root *quota_root, u64 qgroupid)
590 {
591 int ret;
592 struct btrfs_path *path;
593 struct btrfs_qgroup_info_item *qgroup_info;
594 struct btrfs_qgroup_limit_item *qgroup_limit;
595 struct extent_buffer *leaf;
596 struct btrfs_key key;
597
598 if (btrfs_is_testing(quota_root->fs_info))
599 return 0;
600
601 path = btrfs_alloc_path();
602 if (!path)
603 return -ENOMEM;
604
605 key.objectid = 0;
606 key.type = BTRFS_QGROUP_INFO_KEY;
607 key.offset = qgroupid;
608
609 /*
610 * Avoid a transaction abort by catching -EEXIST here. In that
611 * case, we proceed by re-initializing the existing structure
612 * on disk.
613 */
614
615 ret = btrfs_insert_empty_item(trans, quota_root, path, &key,
616 sizeof(*qgroup_info));
617 if (ret && ret != -EEXIST)
618 goto out;
619
620 leaf = path->nodes[0];
621 qgroup_info = btrfs_item_ptr(leaf, path->slots[0],
622 struct btrfs_qgroup_info_item);
623 btrfs_set_qgroup_info_generation(leaf, qgroup_info, trans->transid);
624 btrfs_set_qgroup_info_rfer(leaf, qgroup_info, 0);
625 btrfs_set_qgroup_info_rfer_cmpr(leaf, qgroup_info, 0);
626 btrfs_set_qgroup_info_excl(leaf, qgroup_info, 0);
627 btrfs_set_qgroup_info_excl_cmpr(leaf, qgroup_info, 0);
628
629 btrfs_mark_buffer_dirty(leaf);
630
631 btrfs_release_path(path);
632
633 key.type = BTRFS_QGROUP_LIMIT_KEY;
634 ret = btrfs_insert_empty_item(trans, quota_root, path, &key,
635 sizeof(*qgroup_limit));
636 if (ret && ret != -EEXIST)
637 goto out;
638
639 leaf = path->nodes[0];
640 qgroup_limit = btrfs_item_ptr(leaf, path->slots[0],
641 struct btrfs_qgroup_limit_item);
642 btrfs_set_qgroup_limit_flags(leaf, qgroup_limit, 0);
643 btrfs_set_qgroup_limit_max_rfer(leaf, qgroup_limit, 0);
644 btrfs_set_qgroup_limit_max_excl(leaf, qgroup_limit, 0);
645 btrfs_set_qgroup_limit_rsv_rfer(leaf, qgroup_limit, 0);
646 btrfs_set_qgroup_limit_rsv_excl(leaf, qgroup_limit, 0);
647
648 btrfs_mark_buffer_dirty(leaf);
649
650 ret = 0;
651 out:
652 btrfs_free_path(path);
653 return ret;
654 }
655
656 static int del_qgroup_item(struct btrfs_trans_handle *trans, u64 qgroupid)
657 {
658 int ret;
659 struct btrfs_root *quota_root = trans->fs_info->quota_root;
660 struct btrfs_path *path;
661 struct btrfs_key key;
662
663 path = btrfs_alloc_path();
664 if (!path)
665 return -ENOMEM;
666
667 key.objectid = 0;
668 key.type = BTRFS_QGROUP_INFO_KEY;
669 key.offset = qgroupid;
670 ret = btrfs_search_slot(trans, quota_root, &key, path, -1, 1);
671 if (ret < 0)
672 goto out;
673
674 if (ret > 0) {
675 ret = -ENOENT;
676 goto out;
677 }
678
679 ret = btrfs_del_item(trans, quota_root, path);
680 if (ret)
681 goto out;
682
683 btrfs_release_path(path);
684
685 key.type = BTRFS_QGROUP_LIMIT_KEY;
686 ret = btrfs_search_slot(trans, quota_root, &key, path, -1, 1);
687 if (ret < 0)
688 goto out;
689
690 if (ret > 0) {
691 ret = -ENOENT;
692 goto out;
693 }
694
695 ret = btrfs_del_item(trans, quota_root, path);
696
697 out:
698 btrfs_free_path(path);
699 return ret;
700 }
701
702 static int update_qgroup_limit_item(struct btrfs_trans_handle *trans,
703 struct btrfs_qgroup *qgroup)
704 {
705 struct btrfs_root *quota_root = trans->fs_info->quota_root;
706 struct btrfs_path *path;
707 struct btrfs_key key;
708 struct extent_buffer *l;
709 struct btrfs_qgroup_limit_item *qgroup_limit;
710 int ret;
711 int slot;
712
713 key.objectid = 0;
714 key.type = BTRFS_QGROUP_LIMIT_KEY;
715 key.offset = qgroup->qgroupid;
716
717 path = btrfs_alloc_path();
718 if (!path)
719 return -ENOMEM;
720
721 ret = btrfs_search_slot(trans, quota_root, &key, path, 0, 1);
722 if (ret > 0)
723 ret = -ENOENT;
724
725 if (ret)
726 goto out;
727
728 l = path->nodes[0];
729 slot = path->slots[0];
730 qgroup_limit = btrfs_item_ptr(l, slot, struct btrfs_qgroup_limit_item);
731 btrfs_set_qgroup_limit_flags(l, qgroup_limit, qgroup->lim_flags);
732 btrfs_set_qgroup_limit_max_rfer(l, qgroup_limit, qgroup->max_rfer);
733 btrfs_set_qgroup_limit_max_excl(l, qgroup_limit, qgroup->max_excl);
734 btrfs_set_qgroup_limit_rsv_rfer(l, qgroup_limit, qgroup->rsv_rfer);
735 btrfs_set_qgroup_limit_rsv_excl(l, qgroup_limit, qgroup->rsv_excl);
736
737 btrfs_mark_buffer_dirty(l);
738
739 out:
740 btrfs_free_path(path);
741 return ret;
742 }
743
744 static int update_qgroup_info_item(struct btrfs_trans_handle *trans,
745 struct btrfs_qgroup *qgroup)
746 {
747 struct btrfs_fs_info *fs_info = trans->fs_info;
748 struct btrfs_root *quota_root = fs_info->quota_root;
749 struct btrfs_path *path;
750 struct btrfs_key key;
751 struct extent_buffer *l;
752 struct btrfs_qgroup_info_item *qgroup_info;
753 int ret;
754 int slot;
755
756 if (btrfs_is_testing(fs_info))
757 return 0;
758
759 key.objectid = 0;
760 key.type = BTRFS_QGROUP_INFO_KEY;
761 key.offset = qgroup->qgroupid;
762
763 path = btrfs_alloc_path();
764 if (!path)
765 return -ENOMEM;
766
767 ret = btrfs_search_slot(trans, quota_root, &key, path, 0, 1);
768 if (ret > 0)
769 ret = -ENOENT;
770
771 if (ret)
772 goto out;
773
774 l = path->nodes[0];
775 slot = path->slots[0];
776 qgroup_info = btrfs_item_ptr(l, slot, struct btrfs_qgroup_info_item);
777 btrfs_set_qgroup_info_generation(l, qgroup_info, trans->transid);
778 btrfs_set_qgroup_info_rfer(l, qgroup_info, qgroup->rfer);
779 btrfs_set_qgroup_info_rfer_cmpr(l, qgroup_info, qgroup->rfer_cmpr);
780 btrfs_set_qgroup_info_excl(l, qgroup_info, qgroup->excl);
781 btrfs_set_qgroup_info_excl_cmpr(l, qgroup_info, qgroup->excl_cmpr);
782
783 btrfs_mark_buffer_dirty(l);
784
785 out:
786 btrfs_free_path(path);
787 return ret;
788 }
789
790 static int update_qgroup_status_item(struct btrfs_trans_handle *trans)
791 {
792 struct btrfs_fs_info *fs_info = trans->fs_info;
793 struct btrfs_root *quota_root = fs_info->quota_root;
794 struct btrfs_path *path;
795 struct btrfs_key key;
796 struct extent_buffer *l;
797 struct btrfs_qgroup_status_item *ptr;
798 int ret;
799 int slot;
800
801 key.objectid = 0;
802 key.type = BTRFS_QGROUP_STATUS_KEY;
803 key.offset = 0;
804
805 path = btrfs_alloc_path();
806 if (!path)
807 return -ENOMEM;
808
809 ret = btrfs_search_slot(trans, quota_root, &key, path, 0, 1);
810 if (ret > 0)
811 ret = -ENOENT;
812
813 if (ret)
814 goto out;
815
816 l = path->nodes[0];
817 slot = path->slots[0];
818 ptr = btrfs_item_ptr(l, slot, struct btrfs_qgroup_status_item);
819 btrfs_set_qgroup_status_flags(l, ptr, fs_info->qgroup_flags);
820 btrfs_set_qgroup_status_generation(l, ptr, trans->transid);
821 btrfs_set_qgroup_status_rescan(l, ptr,
822 fs_info->qgroup_rescan_progress.objectid);
823
824 btrfs_mark_buffer_dirty(l);
825
826 out:
827 btrfs_free_path(path);
828 return ret;
829 }
830
831 /*
832 * called with qgroup_lock held
833 */
834 static int btrfs_clean_quota_tree(struct btrfs_trans_handle *trans,
835 struct btrfs_root *root)
836 {
837 struct btrfs_path *path;
838 struct btrfs_key key;
839 struct extent_buffer *leaf = NULL;
840 int ret;
841 int nr = 0;
842
843 path = btrfs_alloc_path();
844 if (!path)
845 return -ENOMEM;
846
847 path->leave_spinning = 1;
848
849 key.objectid = 0;
850 key.offset = 0;
851 key.type = 0;
852
853 while (1) {
854 ret = btrfs_search_slot(trans, root, &key, path, -1, 1);
855 if (ret < 0)
856 goto out;
857 leaf = path->nodes[0];
858 nr = btrfs_header_nritems(leaf);
859 if (!nr)
860 break;
861 /*
862 * delete the leaf one by one
863 * since the whole tree is going
864 * to be deleted.
865 */
866 path->slots[0] = 0;
867 ret = btrfs_del_items(trans, root, path, 0, nr);
868 if (ret)
869 goto out;
870
871 btrfs_release_path(path);
872 }
873 ret = 0;
874 out:
875 btrfs_free_path(path);
876 return ret;
877 }
878
879 int btrfs_quota_enable(struct btrfs_fs_info *fs_info)
880 {
881 struct btrfs_root *quota_root;
882 struct btrfs_root *tree_root = fs_info->tree_root;
883 struct btrfs_path *path = NULL;
884 struct btrfs_qgroup_status_item *ptr;
885 struct extent_buffer *leaf;
886 struct btrfs_key key;
887 struct btrfs_key found_key;
888 struct btrfs_qgroup *qgroup = NULL;
889 struct btrfs_trans_handle *trans = NULL;
890 int ret = 0;
891 int slot;
892
893 mutex_lock(&fs_info->qgroup_ioctl_lock);
894 if (fs_info->quota_root)
895 goto out;
896
897 fs_info->qgroup_ulist = ulist_alloc(GFP_KERNEL);
898 if (!fs_info->qgroup_ulist) {
899 ret = -ENOMEM;
900 goto out;
901 }
902
903 /*
904 * 1 for quota root item
905 * 1 for BTRFS_QGROUP_STATUS item
906 *
907 * Yet we also need 2*n items for a QGROUP_INFO/QGROUP_LIMIT items
908 * per subvolume. However those are not currently reserved since it
909 * would be a lot of overkill.
910 */
911 trans = btrfs_start_transaction(tree_root, 2);
912 if (IS_ERR(trans)) {
913 ret = PTR_ERR(trans);
914 trans = NULL;
915 goto out;
916 }
917
918 /*
919 * initially create the quota tree
920 */
921 quota_root = btrfs_create_tree(trans, BTRFS_QUOTA_TREE_OBJECTID);
922 if (IS_ERR(quota_root)) {
923 ret = PTR_ERR(quota_root);
924 btrfs_abort_transaction(trans, ret);
925 goto out;
926 }
927
928 path = btrfs_alloc_path();
929 if (!path) {
930 ret = -ENOMEM;
931 btrfs_abort_transaction(trans, ret);
932 goto out_free_root;
933 }
934
935 key.objectid = 0;
936 key.type = BTRFS_QGROUP_STATUS_KEY;
937 key.offset = 0;
938
939 ret = btrfs_insert_empty_item(trans, quota_root, path, &key,
940 sizeof(*ptr));
941 if (ret) {
942 btrfs_abort_transaction(trans, ret);
943 goto out_free_path;
944 }
945
946 leaf = path->nodes[0];
947 ptr = btrfs_item_ptr(leaf, path->slots[0],
948 struct btrfs_qgroup_status_item);
949 btrfs_set_qgroup_status_generation(leaf, ptr, trans->transid);
950 btrfs_set_qgroup_status_version(leaf, ptr, BTRFS_QGROUP_STATUS_VERSION);
951 fs_info->qgroup_flags = BTRFS_QGROUP_STATUS_FLAG_ON |
952 BTRFS_QGROUP_STATUS_FLAG_INCONSISTENT;
953 btrfs_set_qgroup_status_flags(leaf, ptr, fs_info->qgroup_flags);
954 btrfs_set_qgroup_status_rescan(leaf, ptr, 0);
955
956 btrfs_mark_buffer_dirty(leaf);
957
958 key.objectid = 0;
959 key.type = BTRFS_ROOT_REF_KEY;
960 key.offset = 0;
961
962 btrfs_release_path(path);
963 ret = btrfs_search_slot_for_read(tree_root, &key, path, 1, 0);
964 if (ret > 0)
965 goto out_add_root;
966 if (ret < 0) {
967 btrfs_abort_transaction(trans, ret);
968 goto out_free_path;
969 }
970
971 while (1) {
972 slot = path->slots[0];
973 leaf = path->nodes[0];
974 btrfs_item_key_to_cpu(leaf, &found_key, slot);
975
976 if (found_key.type == BTRFS_ROOT_REF_KEY) {
977 ret = add_qgroup_item(trans, quota_root,
978 found_key.offset);
979 if (ret) {
980 btrfs_abort_transaction(trans, ret);
981 goto out_free_path;
982 }
983
984 qgroup = add_qgroup_rb(fs_info, found_key.offset);
985 if (IS_ERR(qgroup)) {
986 ret = PTR_ERR(qgroup);
987 btrfs_abort_transaction(trans, ret);
988 goto out_free_path;
989 }
990 }
991 ret = btrfs_next_item(tree_root, path);
992 if (ret < 0) {
993 btrfs_abort_transaction(trans, ret);
994 goto out_free_path;
995 }
996 if (ret)
997 break;
998 }
999
1000 out_add_root:
1001 btrfs_release_path(path);
1002 ret = add_qgroup_item(trans, quota_root, BTRFS_FS_TREE_OBJECTID);
1003 if (ret) {
1004 btrfs_abort_transaction(trans, ret);
1005 goto out_free_path;
1006 }
1007
1008 qgroup = add_qgroup_rb(fs_info, BTRFS_FS_TREE_OBJECTID);
1009 if (IS_ERR(qgroup)) {
1010 ret = PTR_ERR(qgroup);
1011 btrfs_abort_transaction(trans, ret);
1012 goto out_free_path;
1013 }
1014
1015 ret = btrfs_commit_transaction(trans);
1016 trans = NULL;
1017 if (ret)
1018 goto out_free_path;
1019
1020 /*
1021 * Set quota enabled flag after committing the transaction, to avoid
1022 * deadlocks on fs_info->qgroup_ioctl_lock with concurrent snapshot
1023 * creation.
1024 */
1025 spin_lock(&fs_info->qgroup_lock);
1026 fs_info->quota_root = quota_root;
1027 set_bit(BTRFS_FS_QUOTA_ENABLED, &fs_info->flags);
1028 spin_unlock(&fs_info->qgroup_lock);
1029
1030 ret = qgroup_rescan_init(fs_info, 0, 1);
1031 if (!ret) {
1032 qgroup_rescan_zero_tracking(fs_info);
1033 btrfs_queue_work(fs_info->qgroup_rescan_workers,
1034 &fs_info->qgroup_rescan_work);
1035 }
1036
1037 out_free_path:
1038 btrfs_free_path(path);
1039 out_free_root:
1040 if (ret) {
1041 free_extent_buffer(quota_root->node);
1042 free_extent_buffer(quota_root->commit_root);
1043 kfree(quota_root);
1044 }
1045 out:
1046 if (ret) {
1047 ulist_free(fs_info->qgroup_ulist);
1048 fs_info->qgroup_ulist = NULL;
1049 if (trans)
1050 btrfs_end_transaction(trans);
1051 }
1052 mutex_unlock(&fs_info->qgroup_ioctl_lock);
1053 return ret;
1054 }
1055
1056 int btrfs_quota_disable(struct btrfs_fs_info *fs_info)
1057 {
1058 struct btrfs_root *quota_root;
1059 struct btrfs_trans_handle *trans = NULL;
1060 int ret = 0;
1061
1062 mutex_lock(&fs_info->qgroup_ioctl_lock);
1063 if (!fs_info->quota_root)
1064 goto out;
1065
1066 /*
1067 * 1 For the root item
1068 *
1069 * We should also reserve enough items for the quota tree deletion in
1070 * btrfs_clean_quota_tree but this is not done.
1071 */
1072 trans = btrfs_start_transaction(fs_info->tree_root, 1);
1073 if (IS_ERR(trans)) {
1074 ret = PTR_ERR(trans);
1075 goto out;
1076 }
1077
1078 clear_bit(BTRFS_FS_QUOTA_ENABLED, &fs_info->flags);
1079 btrfs_qgroup_wait_for_completion(fs_info, false);
1080 spin_lock(&fs_info->qgroup_lock);
1081 quota_root = fs_info->quota_root;
1082 fs_info->quota_root = NULL;
1083 fs_info->qgroup_flags &= ~BTRFS_QGROUP_STATUS_FLAG_ON;
1084 spin_unlock(&fs_info->qgroup_lock);
1085
1086 btrfs_free_qgroup_config(fs_info);
1087
1088 ret = btrfs_clean_quota_tree(trans, quota_root);
1089 if (ret) {
1090 btrfs_abort_transaction(trans, ret);
1091 goto end_trans;
1092 }
1093
1094 ret = btrfs_del_root(trans, &quota_root->root_key);
1095 if (ret) {
1096 btrfs_abort_transaction(trans, ret);
1097 goto end_trans;
1098 }
1099
1100 list_del(&quota_root->dirty_list);
1101
1102 btrfs_tree_lock(quota_root->node);
1103 btrfs_clean_tree_block(quota_root->node);
1104 btrfs_tree_unlock(quota_root->node);
1105 btrfs_free_tree_block(trans, quota_root, quota_root->node, 0, 1);
1106
1107 free_extent_buffer(quota_root->node);
1108 free_extent_buffer(quota_root->commit_root);
1109 kfree(quota_root);
1110
1111 end_trans:
1112 ret = btrfs_end_transaction(trans);
1113 out:
1114 mutex_unlock(&fs_info->qgroup_ioctl_lock);
1115 return ret;
1116 }
1117
1118 static void qgroup_dirty(struct btrfs_fs_info *fs_info,
1119 struct btrfs_qgroup *qgroup)
1120 {
1121 if (list_empty(&qgroup->dirty))
1122 list_add(&qgroup->dirty, &fs_info->dirty_qgroups);
1123 }
1124
1125 /*
1126 * The easy accounting, we're updating qgroup relationship whose child qgroup
1127 * only has exclusive extents.
1128 *
1129 * In this case, all exclusive extents will also be exclusive for parent, so
1130 * excl/rfer just get added/removed.
1131 *
1132 * So is qgroup reservation space, which should also be added/removed to
1133 * parent.
1134 * Or when child tries to release reservation space, parent will underflow its
1135 * reservation (for relationship adding case).
1136 *
1137 * Caller should hold fs_info->qgroup_lock.
1138 */
1139 static int __qgroup_excl_accounting(struct btrfs_fs_info *fs_info,
1140 struct ulist *tmp, u64 ref_root,
1141 struct btrfs_qgroup *src, int sign)
1142 {
1143 struct btrfs_qgroup *qgroup;
1144 struct btrfs_qgroup_list *glist;
1145 struct ulist_node *unode;
1146 struct ulist_iterator uiter;
1147 u64 num_bytes = src->excl;
1148 int ret = 0;
1149
1150 qgroup = find_qgroup_rb(fs_info, ref_root);
1151 if (!qgroup)
1152 goto out;
1153
1154 qgroup->rfer += sign * num_bytes;
1155 qgroup->rfer_cmpr += sign * num_bytes;
1156
1157 WARN_ON(sign < 0 && qgroup->excl < num_bytes);
1158 qgroup->excl += sign * num_bytes;
1159 qgroup->excl_cmpr += sign * num_bytes;
1160
1161 if (sign > 0)
1162 qgroup_rsv_add_by_qgroup(fs_info, qgroup, src);
1163 else
1164 qgroup_rsv_release_by_qgroup(fs_info, qgroup, src);
1165
1166 qgroup_dirty(fs_info, qgroup);
1167
1168 /* Get all of the parent groups that contain this qgroup */
1169 list_for_each_entry(glist, &qgroup->groups, next_group) {
1170 ret = ulist_add(tmp, glist->group->qgroupid,
1171 qgroup_to_aux(glist->group), GFP_ATOMIC);
1172 if (ret < 0)
1173 goto out;
1174 }
1175
1176 /* Iterate all of the parents and adjust their reference counts */
1177 ULIST_ITER_INIT(&uiter);
1178 while ((unode = ulist_next(tmp, &uiter))) {
1179 qgroup = unode_aux_to_qgroup(unode);
1180 qgroup->rfer += sign * num_bytes;
1181 qgroup->rfer_cmpr += sign * num_bytes;
1182 WARN_ON(sign < 0 && qgroup->excl < num_bytes);
1183 qgroup->excl += sign * num_bytes;
1184 if (sign > 0)
1185 qgroup_rsv_add_by_qgroup(fs_info, qgroup, src);
1186 else
1187 qgroup_rsv_release_by_qgroup(fs_info, qgroup, src);
1188 qgroup->excl_cmpr += sign * num_bytes;
1189 qgroup_dirty(fs_info, qgroup);
1190
1191 /* Add any parents of the parents */
1192 list_for_each_entry(glist, &qgroup->groups, next_group) {
1193 ret = ulist_add(tmp, glist->group->qgroupid,
1194 qgroup_to_aux(glist->group), GFP_ATOMIC);
1195 if (ret < 0)
1196 goto out;
1197 }
1198 }
1199 ret = 0;
1200 out:
1201 return ret;
1202 }
1203
1204
1205 /*
1206 * Quick path for updating qgroup with only excl refs.
1207 *
1208 * In that case, just update all parent will be enough.
1209 * Or we needs to do a full rescan.
1210 * Caller should also hold fs_info->qgroup_lock.
1211 *
1212 * Return 0 for quick update, return >0 for need to full rescan
1213 * and mark INCONSISTENT flag.
1214 * Return < 0 for other error.
1215 */
1216 static int quick_update_accounting(struct btrfs_fs_info *fs_info,
1217 struct ulist *tmp, u64 src, u64 dst,
1218 int sign)
1219 {
1220 struct btrfs_qgroup *qgroup;
1221 int ret = 1;
1222 int err = 0;
1223
1224 qgroup = find_qgroup_rb(fs_info, src);
1225 if (!qgroup)
1226 goto out;
1227 if (qgroup->excl == qgroup->rfer) {
1228 ret = 0;
1229 err = __qgroup_excl_accounting(fs_info, tmp, dst,
1230 qgroup, sign);
1231 if (err < 0) {
1232 ret = err;
1233 goto out;
1234 }
1235 }
1236 out:
1237 if (ret)
1238 fs_info->qgroup_flags |= BTRFS_QGROUP_STATUS_FLAG_INCONSISTENT;
1239 return ret;
1240 }
1241
1242 int btrfs_add_qgroup_relation(struct btrfs_trans_handle *trans, u64 src,
1243 u64 dst)
1244 {
1245 struct btrfs_fs_info *fs_info = trans->fs_info;
1246 struct btrfs_qgroup *parent;
1247 struct btrfs_qgroup *member;
1248 struct btrfs_qgroup_list *list;
1249 struct ulist *tmp;
1250 int ret = 0;
1251
1252 /* Check the level of src and dst first */
1253 if (btrfs_qgroup_level(src) >= btrfs_qgroup_level(dst))
1254 return -EINVAL;
1255
1256 tmp = ulist_alloc(GFP_KERNEL);
1257 if (!tmp)
1258 return -ENOMEM;
1259
1260 mutex_lock(&fs_info->qgroup_ioctl_lock);
1261 if (!fs_info->quota_root) {
1262 ret = -ENOTCONN;
1263 goto out;
1264 }
1265 member = find_qgroup_rb(fs_info, src);
1266 parent = find_qgroup_rb(fs_info, dst);
1267 if (!member || !parent) {
1268 ret = -EINVAL;
1269 goto out;
1270 }
1271
1272 /* check if such qgroup relation exist firstly */
1273 list_for_each_entry(list, &member->groups, next_group) {
1274 if (list->group == parent) {
1275 ret = -EEXIST;
1276 goto out;
1277 }
1278 }
1279
1280 ret = add_qgroup_relation_item(trans, src, dst);
1281 if (ret)
1282 goto out;
1283
1284 ret = add_qgroup_relation_item(trans, dst, src);
1285 if (ret) {
1286 del_qgroup_relation_item(trans, src, dst);
1287 goto out;
1288 }
1289
1290 spin_lock(&fs_info->qgroup_lock);
1291 ret = add_relation_rb(fs_info, src, dst);
1292 if (ret < 0) {
1293 spin_unlock(&fs_info->qgroup_lock);
1294 goto out;
1295 }
1296 ret = quick_update_accounting(fs_info, tmp, src, dst, 1);
1297 spin_unlock(&fs_info->qgroup_lock);
1298 out:
1299 mutex_unlock(&fs_info->qgroup_ioctl_lock);
1300 ulist_free(tmp);
1301 return ret;
1302 }
1303
1304 static int __del_qgroup_relation(struct btrfs_trans_handle *trans, u64 src,
1305 u64 dst)
1306 {
1307 struct btrfs_fs_info *fs_info = trans->fs_info;
1308 struct btrfs_qgroup *parent;
1309 struct btrfs_qgroup *member;
1310 struct btrfs_qgroup_list *list;
1311 struct ulist *tmp;
1312 bool found = false;
1313 int ret = 0;
1314 int ret2;
1315
1316 tmp = ulist_alloc(GFP_KERNEL);
1317 if (!tmp)
1318 return -ENOMEM;
1319
1320 if (!fs_info->quota_root) {
1321 ret = -ENOTCONN;
1322 goto out;
1323 }
1324
1325 member = find_qgroup_rb(fs_info, src);
1326 parent = find_qgroup_rb(fs_info, dst);
1327 /*
1328 * The parent/member pair doesn't exist, then try to delete the dead
1329 * relation items only.
1330 */
1331 if (!member || !parent)
1332 goto delete_item;
1333
1334 /* check if such qgroup relation exist firstly */
1335 list_for_each_entry(list, &member->groups, next_group) {
1336 if (list->group == parent) {
1337 found = true;
1338 break;
1339 }
1340 }
1341
1342 delete_item:
1343 ret = del_qgroup_relation_item(trans, src, dst);
1344 if (ret < 0 && ret != -ENOENT)
1345 goto out;
1346 ret2 = del_qgroup_relation_item(trans, dst, src);
1347 if (ret2 < 0 && ret2 != -ENOENT)
1348 goto out;
1349
1350 /* At least one deletion succeeded, return 0 */
1351 if (!ret || !ret2)
1352 ret = 0;
1353
1354 if (found) {
1355 spin_lock(&fs_info->qgroup_lock);
1356 del_relation_rb(fs_info, src, dst);
1357 ret = quick_update_accounting(fs_info, tmp, src, dst, -1);
1358 spin_unlock(&fs_info->qgroup_lock);
1359 }
1360 out:
1361 ulist_free(tmp);
1362 return ret;
1363 }
1364
1365 int btrfs_del_qgroup_relation(struct btrfs_trans_handle *trans, u64 src,
1366 u64 dst)
1367 {
1368 struct btrfs_fs_info *fs_info = trans->fs_info;
1369 int ret = 0;
1370
1371 mutex_lock(&fs_info->qgroup_ioctl_lock);
1372 ret = __del_qgroup_relation(trans, src, dst);
1373 mutex_unlock(&fs_info->qgroup_ioctl_lock);
1374
1375 return ret;
1376 }
1377
1378 int btrfs_create_qgroup(struct btrfs_trans_handle *trans, u64 qgroupid)
1379 {
1380 struct btrfs_fs_info *fs_info = trans->fs_info;
1381 struct btrfs_root *quota_root;
1382 struct btrfs_qgroup *qgroup;
1383 int ret = 0;
1384
1385 mutex_lock(&fs_info->qgroup_ioctl_lock);
1386 if (!fs_info->quota_root) {
1387 ret = -ENOTCONN;
1388 goto out;
1389 }
1390 quota_root = fs_info->quota_root;
1391 qgroup = find_qgroup_rb(fs_info, qgroupid);
1392 if (qgroup) {
1393 ret = -EEXIST;
1394 goto out;
1395 }
1396
1397 ret = add_qgroup_item(trans, quota_root, qgroupid);
1398 if (ret)
1399 goto out;
1400
1401 spin_lock(&fs_info->qgroup_lock);
1402 qgroup = add_qgroup_rb(fs_info, qgroupid);
1403 spin_unlock(&fs_info->qgroup_lock);
1404
1405 if (IS_ERR(qgroup))
1406 ret = PTR_ERR(qgroup);
1407 out:
1408 mutex_unlock(&fs_info->qgroup_ioctl_lock);
1409 return ret;
1410 }
1411
1412 int btrfs_remove_qgroup(struct btrfs_trans_handle *trans, u64 qgroupid)
1413 {
1414 struct btrfs_fs_info *fs_info = trans->fs_info;
1415 struct btrfs_qgroup *qgroup;
1416 struct btrfs_qgroup_list *list;
1417 int ret = 0;
1418
1419 mutex_lock(&fs_info->qgroup_ioctl_lock);
1420 if (!fs_info->quota_root) {
1421 ret = -ENOTCONN;
1422 goto out;
1423 }
1424
1425 qgroup = find_qgroup_rb(fs_info, qgroupid);
1426 if (!qgroup) {
1427 ret = -ENOENT;
1428 goto out;
1429 }
1430
1431 /* Check if there are no children of this qgroup */
1432 if (!list_empty(&qgroup->members)) {
1433 ret = -EBUSY;
1434 goto out;
1435 }
1436
1437 ret = del_qgroup_item(trans, qgroupid);
1438 if (ret && ret != -ENOENT)
1439 goto out;
1440
1441 while (!list_empty(&qgroup->groups)) {
1442 list = list_first_entry(&qgroup->groups,
1443 struct btrfs_qgroup_list, next_group);
1444 ret = __del_qgroup_relation(trans, qgroupid,
1445 list->group->qgroupid);
1446 if (ret)
1447 goto out;
1448 }
1449
1450 spin_lock(&fs_info->qgroup_lock);
1451 del_qgroup_rb(fs_info, qgroupid);
1452 spin_unlock(&fs_info->qgroup_lock);
1453 out:
1454 mutex_unlock(&fs_info->qgroup_ioctl_lock);
1455 return ret;
1456 }
1457
1458 int btrfs_limit_qgroup(struct btrfs_trans_handle *trans, u64 qgroupid,
1459 struct btrfs_qgroup_limit *limit)
1460 {
1461 struct btrfs_fs_info *fs_info = trans->fs_info;
1462 struct btrfs_qgroup *qgroup;
1463 int ret = 0;
1464 /* Sometimes we would want to clear the limit on this qgroup.
1465 * To meet this requirement, we treat the -1 as a special value
1466 * which tell kernel to clear the limit on this qgroup.
1467 */
1468 const u64 CLEAR_VALUE = -1;
1469
1470 mutex_lock(&fs_info->qgroup_ioctl_lock);
1471 if (!fs_info->quota_root) {
1472 ret = -ENOTCONN;
1473 goto out;
1474 }
1475
1476 qgroup = find_qgroup_rb(fs_info, qgroupid);
1477 if (!qgroup) {
1478 ret = -ENOENT;
1479 goto out;
1480 }
1481
1482 spin_lock(&fs_info->qgroup_lock);
1483 if (limit->flags & BTRFS_QGROUP_LIMIT_MAX_RFER) {
1484 if (limit->max_rfer == CLEAR_VALUE) {
1485 qgroup->lim_flags &= ~BTRFS_QGROUP_LIMIT_MAX_RFER;
1486 limit->flags &= ~BTRFS_QGROUP_LIMIT_MAX_RFER;
1487 qgroup->max_rfer = 0;
1488 } else {
1489 qgroup->max_rfer = limit->max_rfer;
1490 }
1491 }
1492 if (limit->flags & BTRFS_QGROUP_LIMIT_MAX_EXCL) {
1493 if (limit->max_excl == CLEAR_VALUE) {
1494 qgroup->lim_flags &= ~BTRFS_QGROUP_LIMIT_MAX_EXCL;
1495 limit->flags &= ~BTRFS_QGROUP_LIMIT_MAX_EXCL;
1496 qgroup->max_excl = 0;
1497 } else {
1498 qgroup->max_excl = limit->max_excl;
1499 }
1500 }
1501 if (limit->flags & BTRFS_QGROUP_LIMIT_RSV_RFER) {
1502 if (limit->rsv_rfer == CLEAR_VALUE) {
1503 qgroup->lim_flags &= ~BTRFS_QGROUP_LIMIT_RSV_RFER;
1504 limit->flags &= ~BTRFS_QGROUP_LIMIT_RSV_RFER;
1505 qgroup->rsv_rfer = 0;
1506 } else {
1507 qgroup->rsv_rfer = limit->rsv_rfer;
1508 }
1509 }
1510 if (limit->flags & BTRFS_QGROUP_LIMIT_RSV_EXCL) {
1511 if (limit->rsv_excl == CLEAR_VALUE) {
1512 qgroup->lim_flags &= ~BTRFS_QGROUP_LIMIT_RSV_EXCL;
1513 limit->flags &= ~BTRFS_QGROUP_LIMIT_RSV_EXCL;
1514 qgroup->rsv_excl = 0;
1515 } else {
1516 qgroup->rsv_excl = limit->rsv_excl;
1517 }
1518 }
1519 qgroup->lim_flags |= limit->flags;
1520
1521 spin_unlock(&fs_info->qgroup_lock);
1522
1523 ret = update_qgroup_limit_item(trans, qgroup);
1524 if (ret) {
1525 fs_info->qgroup_flags |= BTRFS_QGROUP_STATUS_FLAG_INCONSISTENT;
1526 btrfs_info(fs_info, "unable to update quota limit for %llu",
1527 qgroupid);
1528 }
1529
1530 out:
1531 mutex_unlock(&fs_info->qgroup_ioctl_lock);
1532 return ret;
1533 }
1534
1535 int btrfs_qgroup_trace_extent_nolock(struct btrfs_fs_info *fs_info,
1536 struct btrfs_delayed_ref_root *delayed_refs,
1537 struct btrfs_qgroup_extent_record *record)
1538 {
1539 struct rb_node **p = &delayed_refs->dirty_extent_root.rb_node;
1540 struct rb_node *parent_node = NULL;
1541 struct btrfs_qgroup_extent_record *entry;
1542 u64 bytenr = record->bytenr;
1543
1544 lockdep_assert_held(&delayed_refs->lock);
1545 trace_btrfs_qgroup_trace_extent(fs_info, record);
1546
1547 while (*p) {
1548 parent_node = *p;
1549 entry = rb_entry(parent_node, struct btrfs_qgroup_extent_record,
1550 node);
1551 if (bytenr < entry->bytenr) {
1552 p = &(*p)->rb_left;
1553 } else if (bytenr > entry->bytenr) {
1554 p = &(*p)->rb_right;
1555 } else {
1556 if (record->data_rsv && !entry->data_rsv) {
1557 entry->data_rsv = record->data_rsv;
1558 entry->data_rsv_refroot =
1559 record->data_rsv_refroot;
1560 }
1561 return 1;
1562 }
1563 }
1564
1565 rb_link_node(&record->node, parent_node, p);
1566 rb_insert_color(&record->node, &delayed_refs->dirty_extent_root);
1567 return 0;
1568 }
1569
1570 int btrfs_qgroup_trace_extent_post(struct btrfs_fs_info *fs_info,
1571 struct btrfs_qgroup_extent_record *qrecord)
1572 {
1573 struct ulist *old_root;
1574 u64 bytenr = qrecord->bytenr;
1575 int ret;
1576
1577 ret = btrfs_find_all_roots(NULL, fs_info, bytenr, 0, &old_root, false);
1578 if (ret < 0) {
1579 fs_info->qgroup_flags |= BTRFS_QGROUP_STATUS_FLAG_INCONSISTENT;
1580 btrfs_warn(fs_info,
1581 "error accounting new delayed refs extent (err code: %d), quota inconsistent",
1582 ret);
1583 return 0;
1584 }
1585
1586 /*
1587 * Here we don't need to get the lock of
1588 * trans->transaction->delayed_refs, since inserted qrecord won't
1589 * be deleted, only qrecord->node may be modified (new qrecord insert)
1590 *
1591 * So modifying qrecord->old_roots is safe here
1592 */
1593 qrecord->old_roots = old_root;
1594 return 0;
1595 }
1596
1597 int btrfs_qgroup_trace_extent(struct btrfs_trans_handle *trans, u64 bytenr,
1598 u64 num_bytes, gfp_t gfp_flag)
1599 {
1600 struct btrfs_fs_info *fs_info = trans->fs_info;
1601 struct btrfs_qgroup_extent_record *record;
1602 struct btrfs_delayed_ref_root *delayed_refs;
1603 int ret;
1604
1605 if (!test_bit(BTRFS_FS_QUOTA_ENABLED, &fs_info->flags)
1606 || bytenr == 0 || num_bytes == 0)
1607 return 0;
1608 record = kzalloc(sizeof(*record), gfp_flag);
1609 if (!record)
1610 return -ENOMEM;
1611
1612 delayed_refs = &trans->transaction->delayed_refs;
1613 record->bytenr = bytenr;
1614 record->num_bytes = num_bytes;
1615 record->old_roots = NULL;
1616
1617 spin_lock(&delayed_refs->lock);
1618 ret = btrfs_qgroup_trace_extent_nolock(fs_info, delayed_refs, record);
1619 spin_unlock(&delayed_refs->lock);
1620 if (ret > 0) {
1621 kfree(record);
1622 return 0;
1623 }
1624 return btrfs_qgroup_trace_extent_post(fs_info, record);
1625 }
1626
1627 int btrfs_qgroup_trace_leaf_items(struct btrfs_trans_handle *trans,
1628 struct extent_buffer *eb)
1629 {
1630 struct btrfs_fs_info *fs_info = trans->fs_info;
1631 int nr = btrfs_header_nritems(eb);
1632 int i, extent_type, ret;
1633 struct btrfs_key key;
1634 struct btrfs_file_extent_item *fi;
1635 u64 bytenr, num_bytes;
1636
1637 /* We can be called directly from walk_up_proc() */
1638 if (!test_bit(BTRFS_FS_QUOTA_ENABLED, &fs_info->flags))
1639 return 0;
1640
1641 for (i = 0; i < nr; i++) {
1642 btrfs_item_key_to_cpu(eb, &key, i);
1643
1644 if (key.type != BTRFS_EXTENT_DATA_KEY)
1645 continue;
1646
1647 fi = btrfs_item_ptr(eb, i, struct btrfs_file_extent_item);
1648 /* filter out non qgroup-accountable extents */
1649 extent_type = btrfs_file_extent_type(eb, fi);
1650
1651 if (extent_type == BTRFS_FILE_EXTENT_INLINE)
1652 continue;
1653
1654 bytenr = btrfs_file_extent_disk_bytenr(eb, fi);
1655 if (!bytenr)
1656 continue;
1657
1658 num_bytes = btrfs_file_extent_disk_num_bytes(eb, fi);
1659
1660 ret = btrfs_qgroup_trace_extent(trans, bytenr, num_bytes,
1661 GFP_NOFS);
1662 if (ret)
1663 return ret;
1664 }
1665 cond_resched();
1666 return 0;
1667 }
1668
1669 /*
1670 * Walk up the tree from the bottom, freeing leaves and any interior
1671 * nodes which have had all slots visited. If a node (leaf or
1672 * interior) is freed, the node above it will have it's slot
1673 * incremented. The root node will never be freed.
1674 *
1675 * At the end of this function, we should have a path which has all
1676 * slots incremented to the next position for a search. If we need to
1677 * read a new node it will be NULL and the node above it will have the
1678 * correct slot selected for a later read.
1679 *
1680 * If we increment the root nodes slot counter past the number of
1681 * elements, 1 is returned to signal completion of the search.
1682 */
1683 static int adjust_slots_upwards(struct btrfs_path *path, int root_level)
1684 {
1685 int level = 0;
1686 int nr, slot;
1687 struct extent_buffer *eb;
1688
1689 if (root_level == 0)
1690 return 1;
1691
1692 while (level <= root_level) {
1693 eb = path->nodes[level];
1694 nr = btrfs_header_nritems(eb);
1695 path->slots[level]++;
1696 slot = path->slots[level];
1697 if (slot >= nr || level == 0) {
1698 /*
1699 * Don't free the root - we will detect this
1700 * condition after our loop and return a
1701 * positive value for caller to stop walking the tree.
1702 */
1703 if (level != root_level) {
1704 btrfs_tree_unlock_rw(eb, path->locks[level]);
1705 path->locks[level] = 0;
1706
1707 free_extent_buffer(eb);
1708 path->nodes[level] = NULL;
1709 path->slots[level] = 0;
1710 }
1711 } else {
1712 /*
1713 * We have a valid slot to walk back down
1714 * from. Stop here so caller can process these
1715 * new nodes.
1716 */
1717 break;
1718 }
1719
1720 level++;
1721 }
1722
1723 eb = path->nodes[root_level];
1724 if (path->slots[root_level] >= btrfs_header_nritems(eb))
1725 return 1;
1726
1727 return 0;
1728 }
1729
1730 /*
1731 * Helper function to trace a subtree tree block swap.
1732 *
1733 * The swap will happen in highest tree block, but there may be a lot of
1734 * tree blocks involved.
1735 *
1736 * For example:
1737 * OO = Old tree blocks
1738 * NN = New tree blocks allocated during balance
1739 *
1740 * File tree (257) Reloc tree for 257
1741 * L2 OO NN
1742 * / \ / \
1743 * L1 OO OO (a) OO NN (a)
1744 * / \ / \ / \ / \
1745 * L0 OO OO OO OO OO OO NN NN
1746 * (b) (c) (b) (c)
1747 *
1748 * When calling qgroup_trace_extent_swap(), we will pass:
1749 * @src_eb = OO(a)
1750 * @dst_path = [ nodes[1] = NN(a), nodes[0] = NN(c) ]
1751 * @dst_level = 0
1752 * @root_level = 1
1753 *
1754 * In that case, qgroup_trace_extent_swap() will search from OO(a) to
1755 * reach OO(c), then mark both OO(c) and NN(c) as qgroup dirty.
1756 *
1757 * The main work of qgroup_trace_extent_swap() can be split into 3 parts:
1758 *
1759 * 1) Tree search from @src_eb
1760 * It should acts as a simplified btrfs_search_slot().
1761 * The key for search can be extracted from @dst_path->nodes[dst_level]
1762 * (first key).
1763 *
1764 * 2) Mark the final tree blocks in @src_path and @dst_path qgroup dirty
1765 * NOTE: In above case, OO(a) and NN(a) won't be marked qgroup dirty.
1766 * They should be marked during previous (@dst_level = 1) iteration.
1767 *
1768 * 3) Mark file extents in leaves dirty
1769 * We don't have good way to pick out new file extents only.
1770 * So we still follow the old method by scanning all file extents in
1771 * the leave.
1772 *
1773 * This function can free us from keeping two paths, thus later we only need
1774 * to care about how to iterate all new tree blocks in reloc tree.
1775 */
1776 static int qgroup_trace_extent_swap(struct btrfs_trans_handle* trans,
1777 struct extent_buffer *src_eb,
1778 struct btrfs_path *dst_path,
1779 int dst_level, int root_level,
1780 bool trace_leaf)
1781 {
1782 struct btrfs_key key;
1783 struct btrfs_path *src_path;
1784 struct btrfs_fs_info *fs_info = trans->fs_info;
1785 u32 nodesize = fs_info->nodesize;
1786 int cur_level = root_level;
1787 int ret;
1788
1789 BUG_ON(dst_level > root_level);
1790 /* Level mismatch */
1791 if (btrfs_header_level(src_eb) != root_level)
1792 return -EINVAL;
1793
1794 src_path = btrfs_alloc_path();
1795 if (!src_path) {
1796 ret = -ENOMEM;
1797 goto out;
1798 }
1799
1800 if (dst_level)
1801 btrfs_node_key_to_cpu(dst_path->nodes[dst_level], &key, 0);
1802 else
1803 btrfs_item_key_to_cpu(dst_path->nodes[dst_level], &key, 0);
1804
1805 /* For src_path */
1806 atomic_inc(&src_eb->refs);
1807 src_path->nodes[root_level] = src_eb;
1808 src_path->slots[root_level] = dst_path->slots[root_level];
1809 src_path->locks[root_level] = 0;
1810
1811 /* A simplified version of btrfs_search_slot() */
1812 while (cur_level >= dst_level) {
1813 struct btrfs_key src_key;
1814 struct btrfs_key dst_key;
1815
1816 if (src_path->nodes[cur_level] == NULL) {
1817 struct btrfs_key first_key;
1818 struct extent_buffer *eb;
1819 int parent_slot;
1820 u64 child_gen;
1821 u64 child_bytenr;
1822
1823 eb = src_path->nodes[cur_level + 1];
1824 parent_slot = src_path->slots[cur_level + 1];
1825 child_bytenr = btrfs_node_blockptr(eb, parent_slot);
1826 child_gen = btrfs_node_ptr_generation(eb, parent_slot);
1827 btrfs_node_key_to_cpu(eb, &first_key, parent_slot);
1828
1829 eb = read_tree_block(fs_info, child_bytenr, child_gen,
1830 cur_level, &first_key);
1831 if (IS_ERR(eb)) {
1832 ret = PTR_ERR(eb);
1833 goto out;
1834 } else if (!extent_buffer_uptodate(eb)) {
1835 free_extent_buffer(eb);
1836 ret = -EIO;
1837 goto out;
1838 }
1839
1840 src_path->nodes[cur_level] = eb;
1841
1842 btrfs_tree_read_lock(eb);
1843 btrfs_set_lock_blocking_read(eb);
1844 src_path->locks[cur_level] = BTRFS_READ_LOCK_BLOCKING;
1845 }
1846
1847 src_path->slots[cur_level] = dst_path->slots[cur_level];
1848 if (cur_level) {
1849 btrfs_node_key_to_cpu(dst_path->nodes[cur_level],
1850 &dst_key, dst_path->slots[cur_level]);
1851 btrfs_node_key_to_cpu(src_path->nodes[cur_level],
1852 &src_key, src_path->slots[cur_level]);
1853 } else {
1854 btrfs_item_key_to_cpu(dst_path->nodes[cur_level],
1855 &dst_key, dst_path->slots[cur_level]);
1856 btrfs_item_key_to_cpu(src_path->nodes[cur_level],
1857 &src_key, src_path->slots[cur_level]);
1858 }
1859 /* Content mismatch, something went wrong */
1860 if (btrfs_comp_cpu_keys(&dst_key, &src_key)) {
1861 ret = -ENOENT;
1862 goto out;
1863 }
1864 cur_level--;
1865 }
1866
1867 /*
1868 * Now both @dst_path and @src_path have been populated, record the tree
1869 * blocks for qgroup accounting.
1870 */
1871 ret = btrfs_qgroup_trace_extent(trans, src_path->nodes[dst_level]->start,
1872 nodesize, GFP_NOFS);
1873 if (ret < 0)
1874 goto out;
1875 ret = btrfs_qgroup_trace_extent(trans,
1876 dst_path->nodes[dst_level]->start,
1877 nodesize, GFP_NOFS);
1878 if (ret < 0)
1879 goto out;
1880
1881 /* Record leaf file extents */
1882 if (dst_level == 0 && trace_leaf) {
1883 ret = btrfs_qgroup_trace_leaf_items(trans, src_path->nodes[0]);
1884 if (ret < 0)
1885 goto out;
1886 ret = btrfs_qgroup_trace_leaf_items(trans, dst_path->nodes[0]);
1887 }
1888 out:
1889 btrfs_free_path(src_path);
1890 return ret;
1891 }
1892
1893 /*
1894 * Helper function to do recursive generation-aware depth-first search, to
1895 * locate all new tree blocks in a subtree of reloc tree.
1896 *
1897 * E.g. (OO = Old tree blocks, NN = New tree blocks, whose gen == last_snapshot)
1898 * reloc tree
1899 * L2 NN (a)
1900 * / \
1901 * L1 OO NN (b)
1902 * / \ / \
1903 * L0 OO OO OO NN
1904 * (c) (d)
1905 * If we pass:
1906 * @dst_path = [ nodes[1] = NN(b), nodes[0] = NULL ],
1907 * @cur_level = 1
1908 * @root_level = 1
1909 *
1910 * We will iterate through tree blocks NN(b), NN(d) and info qgroup to trace
1911 * above tree blocks along with their counter parts in file tree.
1912 * While during search, old tree blocks OO(c) will be skipped as tree block swap
1913 * won't affect OO(c).
1914 */
1915 static int qgroup_trace_new_subtree_blocks(struct btrfs_trans_handle* trans,
1916 struct extent_buffer *src_eb,
1917 struct btrfs_path *dst_path,
1918 int cur_level, int root_level,
1919 u64 last_snapshot, bool trace_leaf)
1920 {
1921 struct btrfs_fs_info *fs_info = trans->fs_info;
1922 struct extent_buffer *eb;
1923 bool need_cleanup = false;
1924 int ret = 0;
1925 int i;
1926
1927 /* Level sanity check */
1928 if (cur_level < 0 || cur_level >= BTRFS_MAX_LEVEL - 1 ||
1929 root_level < 0 || root_level >= BTRFS_MAX_LEVEL - 1 ||
1930 root_level < cur_level) {
1931 btrfs_err_rl(fs_info,
1932 "%s: bad levels, cur_level=%d root_level=%d",
1933 __func__, cur_level, root_level);
1934 return -EUCLEAN;
1935 }
1936
1937 /* Read the tree block if needed */
1938 if (dst_path->nodes[cur_level] == NULL) {
1939 struct btrfs_key first_key;
1940 int parent_slot;
1941 u64 child_gen;
1942 u64 child_bytenr;
1943
1944 /*
1945 * dst_path->nodes[root_level] must be initialized before
1946 * calling this function.
1947 */
1948 if (cur_level == root_level) {
1949 btrfs_err_rl(fs_info,
1950 "%s: dst_path->nodes[%d] not initialized, root_level=%d cur_level=%d",
1951 __func__, root_level, root_level, cur_level);
1952 return -EUCLEAN;
1953 }
1954
1955 /*
1956 * We need to get child blockptr/gen from parent before we can
1957 * read it.
1958 */
1959 eb = dst_path->nodes[cur_level + 1];
1960 parent_slot = dst_path->slots[cur_level + 1];
1961 child_bytenr = btrfs_node_blockptr(eb, parent_slot);
1962 child_gen = btrfs_node_ptr_generation(eb, parent_slot);
1963 btrfs_node_key_to_cpu(eb, &first_key, parent_slot);
1964
1965 /* This node is old, no need to trace */
1966 if (child_gen < last_snapshot)
1967 goto out;
1968
1969 eb = read_tree_block(fs_info, child_bytenr, child_gen,
1970 cur_level, &first_key);
1971 if (IS_ERR(eb)) {
1972 ret = PTR_ERR(eb);
1973 goto out;
1974 } else if (!extent_buffer_uptodate(eb)) {
1975 free_extent_buffer(eb);
1976 ret = -EIO;
1977 goto out;
1978 }
1979
1980 dst_path->nodes[cur_level] = eb;
1981 dst_path->slots[cur_level] = 0;
1982
1983 btrfs_tree_read_lock(eb);
1984 btrfs_set_lock_blocking_read(eb);
1985 dst_path->locks[cur_level] = BTRFS_READ_LOCK_BLOCKING;
1986 need_cleanup = true;
1987 }
1988
1989 /* Now record this tree block and its counter part for qgroups */
1990 ret = qgroup_trace_extent_swap(trans, src_eb, dst_path, cur_level,
1991 root_level, trace_leaf);
1992 if (ret < 0)
1993 goto cleanup;
1994
1995 eb = dst_path->nodes[cur_level];
1996
1997 if (cur_level > 0) {
1998 /* Iterate all child tree blocks */
1999 for (i = 0; i < btrfs_header_nritems(eb); i++) {
2000 /* Skip old tree blocks as they won't be swapped */
2001 if (btrfs_node_ptr_generation(eb, i) < last_snapshot)
2002 continue;
2003 dst_path->slots[cur_level] = i;
2004
2005 /* Recursive call (at most 7 times) */
2006 ret = qgroup_trace_new_subtree_blocks(trans, src_eb,
2007 dst_path, cur_level - 1, root_level,
2008 last_snapshot, trace_leaf);
2009 if (ret < 0)
2010 goto cleanup;
2011 }
2012 }
2013
2014 cleanup:
2015 if (need_cleanup) {
2016 /* Clean up */
2017 btrfs_tree_unlock_rw(dst_path->nodes[cur_level],
2018 dst_path->locks[cur_level]);
2019 free_extent_buffer(dst_path->nodes[cur_level]);
2020 dst_path->nodes[cur_level] = NULL;
2021 dst_path->slots[cur_level] = 0;
2022 dst_path->locks[cur_level] = 0;
2023 }
2024 out:
2025 return ret;
2026 }
2027
2028 static int qgroup_trace_subtree_swap(struct btrfs_trans_handle *trans,
2029 struct extent_buffer *src_eb,
2030 struct extent_buffer *dst_eb,
2031 u64 last_snapshot, bool trace_leaf)
2032 {
2033 struct btrfs_fs_info *fs_info = trans->fs_info;
2034 struct btrfs_path *dst_path = NULL;
2035 int level;
2036 int ret;
2037
2038 if (!test_bit(BTRFS_FS_QUOTA_ENABLED, &fs_info->flags))
2039 return 0;
2040
2041 /* Wrong parameter order */
2042 if (btrfs_header_generation(src_eb) > btrfs_header_generation(dst_eb)) {
2043 btrfs_err_rl(fs_info,
2044 "%s: bad parameter order, src_gen=%llu dst_gen=%llu", __func__,
2045 btrfs_header_generation(src_eb),
2046 btrfs_header_generation(dst_eb));
2047 return -EUCLEAN;
2048 }
2049
2050 if (!extent_buffer_uptodate(src_eb) || !extent_buffer_uptodate(dst_eb)) {
2051 ret = -EIO;
2052 goto out;
2053 }
2054
2055 level = btrfs_header_level(dst_eb);
2056 dst_path = btrfs_alloc_path();
2057 if (!dst_path) {
2058 ret = -ENOMEM;
2059 goto out;
2060 }
2061 /* For dst_path */
2062 atomic_inc(&dst_eb->refs);
2063 dst_path->nodes[level] = dst_eb;
2064 dst_path->slots[level] = 0;
2065 dst_path->locks[level] = 0;
2066
2067 /* Do the generation aware breadth-first search */
2068 ret = qgroup_trace_new_subtree_blocks(trans, src_eb, dst_path, level,
2069 level, last_snapshot, trace_leaf);
2070 if (ret < 0)
2071 goto out;
2072 ret = 0;
2073
2074 out:
2075 btrfs_free_path(dst_path);
2076 if (ret < 0)
2077 fs_info->qgroup_flags |= BTRFS_QGROUP_STATUS_FLAG_INCONSISTENT;
2078 return ret;
2079 }
2080
2081 int btrfs_qgroup_trace_subtree(struct btrfs_trans_handle *trans,
2082 struct extent_buffer *root_eb,
2083 u64 root_gen, int root_level)
2084 {
2085 struct btrfs_fs_info *fs_info = trans->fs_info;
2086 int ret = 0;
2087 int level;
2088 struct extent_buffer *eb = root_eb;
2089 struct btrfs_path *path = NULL;
2090
2091 BUG_ON(root_level < 0 || root_level >= BTRFS_MAX_LEVEL);
2092 BUG_ON(root_eb == NULL);
2093
2094 if (!test_bit(BTRFS_FS_QUOTA_ENABLED, &fs_info->flags))
2095 return 0;
2096
2097 if (!extent_buffer_uptodate(root_eb)) {
2098 ret = btrfs_read_buffer(root_eb, root_gen, root_level, NULL);
2099 if (ret)
2100 goto out;
2101 }
2102
2103 if (root_level == 0) {
2104 ret = btrfs_qgroup_trace_leaf_items(trans, root_eb);
2105 goto out;
2106 }
2107
2108 path = btrfs_alloc_path();
2109 if (!path)
2110 return -ENOMEM;
2111
2112 /*
2113 * Walk down the tree. Missing extent blocks are filled in as
2114 * we go. Metadata is accounted every time we read a new
2115 * extent block.
2116 *
2117 * When we reach a leaf, we account for file extent items in it,
2118 * walk back up the tree (adjusting slot pointers as we go)
2119 * and restart the search process.
2120 */
2121 atomic_inc(&root_eb->refs); /* For path */
2122 path->nodes[root_level] = root_eb;
2123 path->slots[root_level] = 0;
2124 path->locks[root_level] = 0; /* so release_path doesn't try to unlock */
2125 walk_down:
2126 level = root_level;
2127 while (level >= 0) {
2128 if (path->nodes[level] == NULL) {
2129 struct btrfs_key first_key;
2130 int parent_slot;
2131 u64 child_gen;
2132 u64 child_bytenr;
2133
2134 /*
2135 * We need to get child blockptr/gen from parent before
2136 * we can read it.
2137 */
2138 eb = path->nodes[level + 1];
2139 parent_slot = path->slots[level + 1];
2140 child_bytenr = btrfs_node_blockptr(eb, parent_slot);
2141 child_gen = btrfs_node_ptr_generation(eb, parent_slot);
2142 btrfs_node_key_to_cpu(eb, &first_key, parent_slot);
2143
2144 eb = read_tree_block(fs_info, child_bytenr, child_gen,
2145 level, &first_key);
2146 if (IS_ERR(eb)) {
2147 ret = PTR_ERR(eb);
2148 goto out;
2149 } else if (!extent_buffer_uptodate(eb)) {
2150 free_extent_buffer(eb);
2151 ret = -EIO;
2152 goto out;
2153 }
2154
2155 path->nodes[level] = eb;
2156 path->slots[level] = 0;
2157
2158 btrfs_tree_read_lock(eb);
2159 btrfs_set_lock_blocking_read(eb);
2160 path->locks[level] = BTRFS_READ_LOCK_BLOCKING;
2161
2162 ret = btrfs_qgroup_trace_extent(trans, child_bytenr,
2163 fs_info->nodesize,
2164 GFP_NOFS);
2165 if (ret)
2166 goto out;
2167 }
2168
2169 if (level == 0) {
2170 ret = btrfs_qgroup_trace_leaf_items(trans,
2171 path->nodes[level]);
2172 if (ret)
2173 goto out;
2174
2175 /* Nonzero return here means we completed our search */
2176 ret = adjust_slots_upwards(path, root_level);
2177 if (ret)
2178 break;
2179
2180 /* Restart search with new slots */
2181 goto walk_down;
2182 }
2183
2184 level--;
2185 }
2186
2187 ret = 0;
2188 out:
2189 btrfs_free_path(path);
2190
2191 return ret;
2192 }
2193
2194 #define UPDATE_NEW 0
2195 #define UPDATE_OLD 1
2196 /*
2197 * Walk all of the roots that points to the bytenr and adjust their refcnts.
2198 */
2199 static int qgroup_update_refcnt(struct btrfs_fs_info *fs_info,
2200 struct ulist *roots, struct ulist *tmp,
2201 struct ulist *qgroups, u64 seq, int update_old)
2202 {
2203 struct ulist_node *unode;
2204 struct ulist_iterator uiter;
2205 struct ulist_node *tmp_unode;
2206 struct ulist_iterator tmp_uiter;
2207 struct btrfs_qgroup *qg;
2208 int ret = 0;
2209
2210 if (!roots)
2211 return 0;
2212 ULIST_ITER_INIT(&uiter);
2213 while ((unode = ulist_next(roots, &uiter))) {
2214 qg = find_qgroup_rb(fs_info, unode->val);
2215 if (!qg)
2216 continue;
2217
2218 ulist_reinit(tmp);
2219 ret = ulist_add(qgroups, qg->qgroupid, qgroup_to_aux(qg),
2220 GFP_ATOMIC);
2221 if (ret < 0)
2222 return ret;
2223 ret = ulist_add(tmp, qg->qgroupid, qgroup_to_aux(qg), GFP_ATOMIC);
2224 if (ret < 0)
2225 return ret;
2226 ULIST_ITER_INIT(&tmp_uiter);
2227 while ((tmp_unode = ulist_next(tmp, &tmp_uiter))) {
2228 struct btrfs_qgroup_list *glist;
2229
2230 qg = unode_aux_to_qgroup(tmp_unode);
2231 if (update_old)
2232 btrfs_qgroup_update_old_refcnt(qg, seq, 1);
2233 else
2234 btrfs_qgroup_update_new_refcnt(qg, seq, 1);
2235 list_for_each_entry(glist, &qg->groups, next_group) {
2236 ret = ulist_add(qgroups, glist->group->qgroupid,
2237 qgroup_to_aux(glist->group),
2238 GFP_ATOMIC);
2239 if (ret < 0)
2240 return ret;
2241 ret = ulist_add(tmp, glist->group->qgroupid,
2242 qgroup_to_aux(glist->group),
2243 GFP_ATOMIC);
2244 if (ret < 0)
2245 return ret;
2246 }
2247 }
2248 }
2249 return 0;
2250 }
2251
2252 /*
2253 * Update qgroup rfer/excl counters.
2254 * Rfer update is easy, codes can explain themselves.
2255 *
2256 * Excl update is tricky, the update is split into 2 part.
2257 * Part 1: Possible exclusive <-> sharing detect:
2258 * | A | !A |
2259 * -------------------------------------
2260 * B | * | - |
2261 * -------------------------------------
2262 * !B | + | ** |
2263 * -------------------------------------
2264 *
2265 * Conditions:
2266 * A: cur_old_roots < nr_old_roots (not exclusive before)
2267 * !A: cur_old_roots == nr_old_roots (possible exclusive before)
2268 * B: cur_new_roots < nr_new_roots (not exclusive now)
2269 * !B: cur_new_roots == nr_new_roots (possible exclusive now)
2270 *
2271 * Results:
2272 * +: Possible sharing -> exclusive -: Possible exclusive -> sharing
2273 * *: Definitely not changed. **: Possible unchanged.
2274 *
2275 * For !A and !B condition, the exception is cur_old/new_roots == 0 case.
2276 *
2277 * To make the logic clear, we first use condition A and B to split
2278 * combination into 4 results.
2279 *
2280 * Then, for result "+" and "-", check old/new_roots == 0 case, as in them
2281 * only on variant maybe 0.
2282 *
2283 * Lastly, check result **, since there are 2 variants maybe 0, split them
2284 * again(2x2).
2285 * But this time we don't need to consider other things, the codes and logic
2286 * is easy to understand now.
2287 */
2288 static int qgroup_update_counters(struct btrfs_fs_info *fs_info,
2289 struct ulist *qgroups,
2290 u64 nr_old_roots,
2291 u64 nr_new_roots,
2292 u64 num_bytes, u64 seq)
2293 {
2294 struct ulist_node *unode;
2295 struct ulist_iterator uiter;
2296 struct btrfs_qgroup *qg;
2297 u64 cur_new_count, cur_old_count;
2298
2299 ULIST_ITER_INIT(&uiter);
2300 while ((unode = ulist_next(qgroups, &uiter))) {
2301 bool dirty = false;
2302
2303 qg = unode_aux_to_qgroup(unode);
2304 cur_old_count = btrfs_qgroup_get_old_refcnt(qg, seq);
2305 cur_new_count = btrfs_qgroup_get_new_refcnt(qg, seq);
2306
2307 trace_qgroup_update_counters(fs_info, qg, cur_old_count,
2308 cur_new_count);
2309
2310 /* Rfer update part */
2311 if (cur_old_count == 0 && cur_new_count > 0) {
2312 qg->rfer += num_bytes;
2313 qg->rfer_cmpr += num_bytes;
2314 dirty = true;
2315 }
2316 if (cur_old_count > 0 && cur_new_count == 0) {
2317 qg->rfer -= num_bytes;
2318 qg->rfer_cmpr -= num_bytes;
2319 dirty = true;
2320 }
2321
2322 /* Excl update part */
2323 /* Exclusive/none -> shared case */
2324 if (cur_old_count == nr_old_roots &&
2325 cur_new_count < nr_new_roots) {
2326 /* Exclusive -> shared */
2327 if (cur_old_count != 0) {
2328 qg->excl -= num_bytes;
2329 qg->excl_cmpr -= num_bytes;
2330 dirty = true;
2331 }
2332 }
2333
2334 /* Shared -> exclusive/none case */
2335 if (cur_old_count < nr_old_roots &&
2336 cur_new_count == nr_new_roots) {
2337 /* Shared->exclusive */
2338 if (cur_new_count != 0) {
2339 qg->excl += num_bytes;
2340 qg->excl_cmpr += num_bytes;
2341 dirty = true;
2342 }
2343 }
2344
2345 /* Exclusive/none -> exclusive/none case */
2346 if (cur_old_count == nr_old_roots &&
2347 cur_new_count == nr_new_roots) {
2348 if (cur_old_count == 0) {
2349 /* None -> exclusive/none */
2350
2351 if (cur_new_count != 0) {
2352 /* None -> exclusive */
2353 qg->excl += num_bytes;
2354 qg->excl_cmpr += num_bytes;
2355 dirty = true;
2356 }
2357 /* None -> none, nothing changed */
2358 } else {
2359 /* Exclusive -> exclusive/none */
2360
2361 if (cur_new_count == 0) {
2362 /* Exclusive -> none */
2363 qg->excl -= num_bytes;
2364 qg->excl_cmpr -= num_bytes;
2365 dirty = true;
2366 }
2367 /* Exclusive -> exclusive, nothing changed */
2368 }
2369 }
2370
2371 if (dirty)
2372 qgroup_dirty(fs_info, qg);
2373 }
2374 return 0;
2375 }
2376
2377 /*
2378 * Check if the @roots potentially is a list of fs tree roots
2379 *
2380 * Return 0 for definitely not a fs/subvol tree roots ulist
2381 * Return 1 for possible fs/subvol tree roots in the list (considering an empty
2382 * one as well)
2383 */
2384 static int maybe_fs_roots(struct ulist *roots)
2385 {
2386 struct ulist_node *unode;
2387 struct ulist_iterator uiter;
2388
2389 /* Empty one, still possible for fs roots */
2390 if (!roots || roots->nnodes == 0)
2391 return 1;
2392
2393 ULIST_ITER_INIT(&uiter);
2394 unode = ulist_next(roots, &uiter);
2395 if (!unode)
2396 return 1;
2397
2398 /*
2399 * If it contains fs tree roots, then it must belong to fs/subvol
2400 * trees.
2401 * If it contains a non-fs tree, it won't be shared with fs/subvol trees.
2402 */
2403 return is_fstree(unode->val);
2404 }
2405
2406 int btrfs_qgroup_account_extent(struct btrfs_trans_handle *trans, u64 bytenr,
2407 u64 num_bytes, struct ulist *old_roots,
2408 struct ulist *new_roots)
2409 {
2410 struct btrfs_fs_info *fs_info = trans->fs_info;
2411 struct ulist *qgroups = NULL;
2412 struct ulist *tmp = NULL;
2413 u64 seq;
2414 u64 nr_new_roots = 0;
2415 u64 nr_old_roots = 0;
2416 int ret = 0;
2417
2418 /*
2419 * If quotas get disabled meanwhile, the resouces need to be freed and
2420 * we can't just exit here.
2421 */
2422 if (!test_bit(BTRFS_FS_QUOTA_ENABLED, &fs_info->flags))
2423 goto out_free;
2424
2425 if (new_roots) {
2426 if (!maybe_fs_roots(new_roots))
2427 goto out_free;
2428 nr_new_roots = new_roots->nnodes;
2429 }
2430 if (old_roots) {
2431 if (!maybe_fs_roots(old_roots))
2432 goto out_free;
2433 nr_old_roots = old_roots->nnodes;
2434 }
2435
2436 /* Quick exit, either not fs tree roots, or won't affect any qgroup */
2437 if (nr_old_roots == 0 && nr_new_roots == 0)
2438 goto out_free;
2439
2440 BUG_ON(!fs_info->quota_root);
2441
2442 trace_btrfs_qgroup_account_extent(fs_info, trans->transid, bytenr,
2443 num_bytes, nr_old_roots, nr_new_roots);
2444
2445 qgroups = ulist_alloc(GFP_NOFS);
2446 if (!qgroups) {
2447 ret = -ENOMEM;
2448 goto out_free;
2449 }
2450 tmp = ulist_alloc(GFP_NOFS);
2451 if (!tmp) {
2452 ret = -ENOMEM;
2453 goto out_free;
2454 }
2455
2456 mutex_lock(&fs_info->qgroup_rescan_lock);
2457 if (fs_info->qgroup_flags & BTRFS_QGROUP_STATUS_FLAG_RESCAN) {
2458 if (fs_info->qgroup_rescan_progress.objectid <= bytenr) {
2459 mutex_unlock(&fs_info->qgroup_rescan_lock);
2460 ret = 0;
2461 goto out_free;
2462 }
2463 }
2464 mutex_unlock(&fs_info->qgroup_rescan_lock);
2465
2466 spin_lock(&fs_info->qgroup_lock);
2467 seq = fs_info->qgroup_seq;
2468
2469 /* Update old refcnts using old_roots */
2470 ret = qgroup_update_refcnt(fs_info, old_roots, tmp, qgroups, seq,
2471 UPDATE_OLD);
2472 if (ret < 0)
2473 goto out;
2474
2475 /* Update new refcnts using new_roots */
2476 ret = qgroup_update_refcnt(fs_info, new_roots, tmp, qgroups, seq,
2477 UPDATE_NEW);
2478 if (ret < 0)
2479 goto out;
2480
2481 qgroup_update_counters(fs_info, qgroups, nr_old_roots, nr_new_roots,
2482 num_bytes, seq);
2483
2484 /*
2485 * Bump qgroup_seq to avoid seq overlap
2486 */
2487 fs_info->qgroup_seq += max(nr_old_roots, nr_new_roots) + 1;
2488 out:
2489 spin_unlock(&fs_info->qgroup_lock);
2490 out_free:
2491 ulist_free(tmp);
2492 ulist_free(qgroups);
2493 ulist_free(old_roots);
2494 ulist_free(new_roots);
2495 return ret;
2496 }
2497
2498 int btrfs_qgroup_account_extents(struct btrfs_trans_handle *trans)
2499 {
2500 struct btrfs_fs_info *fs_info = trans->fs_info;
2501 struct btrfs_qgroup_extent_record *record;
2502 struct btrfs_delayed_ref_root *delayed_refs;
2503 struct ulist *new_roots = NULL;
2504 struct rb_node *node;
2505 u64 num_dirty_extents = 0;
2506 u64 qgroup_to_skip;
2507 int ret = 0;
2508
2509 delayed_refs = &trans->transaction->delayed_refs;
2510 qgroup_to_skip = delayed_refs->qgroup_to_skip;
2511 while ((node = rb_first(&delayed_refs->dirty_extent_root))) {
2512 record = rb_entry(node, struct btrfs_qgroup_extent_record,
2513 node);
2514
2515 num_dirty_extents++;
2516 trace_btrfs_qgroup_account_extents(fs_info, record);
2517
2518 if (!ret) {
2519 /*
2520 * Old roots should be searched when inserting qgroup
2521 * extent record
2522 */
2523 if (WARN_ON(!record->old_roots)) {
2524 /* Search commit root to find old_roots */
2525 ret = btrfs_find_all_roots(NULL, fs_info,
2526 record->bytenr, 0,
2527 &record->old_roots, false);
2528 if (ret < 0)
2529 goto cleanup;
2530 }
2531
2532 /* Free the reserved data space */
2533 btrfs_qgroup_free_refroot(fs_info,
2534 record->data_rsv_refroot,
2535 record->data_rsv,
2536 BTRFS_QGROUP_RSV_DATA);
2537 /*
2538 * Use SEQ_LAST as time_seq to do special search, which
2539 * doesn't lock tree or delayed_refs and search current
2540 * root. It's safe inside commit_transaction().
2541 */
2542 ret = btrfs_find_all_roots(trans, fs_info,
2543 record->bytenr, SEQ_LAST, &new_roots, false);
2544 if (ret < 0)
2545 goto cleanup;
2546 if (qgroup_to_skip) {
2547 ulist_del(new_roots, qgroup_to_skip, 0);
2548 ulist_del(record->old_roots, qgroup_to_skip,
2549 0);
2550 }
2551 ret = btrfs_qgroup_account_extent(trans, record->bytenr,
2552 record->num_bytes,
2553 record->old_roots,
2554 new_roots);
2555 record->old_roots = NULL;
2556 new_roots = NULL;
2557 }
2558 cleanup:
2559 ulist_free(record->old_roots);
2560 ulist_free(new_roots);
2561 new_roots = NULL;
2562 rb_erase(node, &delayed_refs->dirty_extent_root);
2563 kfree(record);
2564
2565 }
2566 trace_qgroup_num_dirty_extents(fs_info, trans->transid,
2567 num_dirty_extents);
2568 return ret;
2569 }
2570
2571 /*
2572 * called from commit_transaction. Writes all changed qgroups to disk.
2573 */
2574 int btrfs_run_qgroups(struct btrfs_trans_handle *trans)
2575 {
2576 struct btrfs_fs_info *fs_info = trans->fs_info;
2577 int ret = 0;
2578
2579 if (!fs_info->quota_root)
2580 return ret;
2581
2582 spin_lock(&fs_info->qgroup_lock);
2583 while (!list_empty(&fs_info->dirty_qgroups)) {
2584 struct btrfs_qgroup *qgroup;
2585 qgroup = list_first_entry(&fs_info->dirty_qgroups,
2586 struct btrfs_qgroup, dirty);
2587 list_del_init(&qgroup->dirty);
2588 spin_unlock(&fs_info->qgroup_lock);
2589 ret = update_qgroup_info_item(trans, qgroup);
2590 if (ret)
2591 fs_info->qgroup_flags |=
2592 BTRFS_QGROUP_STATUS_FLAG_INCONSISTENT;
2593 ret = update_qgroup_limit_item(trans, qgroup);
2594 if (ret)
2595 fs_info->qgroup_flags |=
2596 BTRFS_QGROUP_STATUS_FLAG_INCONSISTENT;
2597 spin_lock(&fs_info->qgroup_lock);
2598 }
2599 if (test_bit(BTRFS_FS_QUOTA_ENABLED, &fs_info->flags))
2600 fs_info->qgroup_flags |= BTRFS_QGROUP_STATUS_FLAG_ON;
2601 else
2602 fs_info->qgroup_flags &= ~BTRFS_QGROUP_STATUS_FLAG_ON;
2603 spin_unlock(&fs_info->qgroup_lock);
2604
2605 ret = update_qgroup_status_item(trans);
2606 if (ret)
2607 fs_info->qgroup_flags |= BTRFS_QGROUP_STATUS_FLAG_INCONSISTENT;
2608
2609 return ret;
2610 }
2611
2612 /*
2613 * Copy the accounting information between qgroups. This is necessary
2614 * when a snapshot or a subvolume is created. Throwing an error will
2615 * cause a transaction abort so we take extra care here to only error
2616 * when a readonly fs is a reasonable outcome.
2617 */
2618 int btrfs_qgroup_inherit(struct btrfs_trans_handle *trans, u64 srcid,
2619 u64 objectid, struct btrfs_qgroup_inherit *inherit)
2620 {
2621 int ret = 0;
2622 int i;
2623 u64 *i_qgroups;
2624 bool committing = false;
2625 struct btrfs_fs_info *fs_info = trans->fs_info;
2626 struct btrfs_root *quota_root;
2627 struct btrfs_qgroup *srcgroup;
2628 struct btrfs_qgroup *dstgroup;
2629 u32 level_size = 0;
2630 u64 nums;
2631
2632 /*
2633 * There are only two callers of this function.
2634 *
2635 * One in create_subvol() in the ioctl context, which needs to hold
2636 * the qgroup_ioctl_lock.
2637 *
2638 * The other one in create_pending_snapshot() where no other qgroup
2639 * code can modify the fs as they all need to either start a new trans
2640 * or hold a trans handler, thus we don't need to hold
2641 * qgroup_ioctl_lock.
2642 * This would avoid long and complex lock chain and make lockdep happy.
2643 */
2644 spin_lock(&fs_info->trans_lock);
2645 if (trans->transaction->state == TRANS_STATE_COMMIT_DOING)
2646 committing = true;
2647 spin_unlock(&fs_info->trans_lock);
2648
2649 if (!committing)
2650 mutex_lock(&fs_info->qgroup_ioctl_lock);
2651 if (!test_bit(BTRFS_FS_QUOTA_ENABLED, &fs_info->flags))
2652 goto out;
2653
2654 quota_root = fs_info->quota_root;
2655 if (!quota_root) {
2656 ret = -EINVAL;
2657 goto out;
2658 }
2659
2660 if (inherit) {
2661 i_qgroups = (u64 *)(inherit + 1);
2662 nums = inherit->num_qgroups + 2 * inherit->num_ref_copies +
2663 2 * inherit->num_excl_copies;
2664 for (i = 0; i < nums; ++i) {
2665 srcgroup = find_qgroup_rb(fs_info, *i_qgroups);
2666
2667 /*
2668 * Zero out invalid groups so we can ignore
2669 * them later.
2670 */
2671 if (!srcgroup ||
2672 ((srcgroup->qgroupid >> 48) <= (objectid >> 48)))
2673 *i_qgroups = 0ULL;
2674
2675 ++i_qgroups;
2676 }
2677 }
2678
2679 /*
2680 * create a tracking group for the subvol itself
2681 */
2682 ret = add_qgroup_item(trans, quota_root, objectid);
2683 if (ret)
2684 goto out;
2685
2686 /*
2687 * add qgroup to all inherited groups
2688 */
2689 if (inherit) {
2690 i_qgroups = (u64 *)(inherit + 1);
2691 for (i = 0; i < inherit->num_qgroups; ++i, ++i_qgroups) {
2692 if (*i_qgroups == 0)
2693 continue;
2694 ret = add_qgroup_relation_item(trans, objectid,
2695 *i_qgroups);
2696 if (ret && ret != -EEXIST)
2697 goto out;
2698 ret = add_qgroup_relation_item(trans, *i_qgroups,
2699 objectid);
2700 if (ret && ret != -EEXIST)
2701 goto out;
2702 }
2703 ret = 0;
2704 }
2705
2706
2707 spin_lock(&fs_info->qgroup_lock);
2708
2709 dstgroup = add_qgroup_rb(fs_info, objectid);
2710 if (IS_ERR(dstgroup)) {
2711 ret = PTR_ERR(dstgroup);
2712 goto unlock;
2713 }
2714
2715 if (inherit && inherit->flags & BTRFS_QGROUP_INHERIT_SET_LIMITS) {
2716 dstgroup->lim_flags = inherit->lim.flags;
2717 dstgroup->max_rfer = inherit->lim.max_rfer;
2718 dstgroup->max_excl = inherit->lim.max_excl;
2719 dstgroup->rsv_rfer = inherit->lim.rsv_rfer;
2720 dstgroup->rsv_excl = inherit->lim.rsv_excl;
2721
2722 ret = update_qgroup_limit_item(trans, dstgroup);
2723 if (ret) {
2724 fs_info->qgroup_flags |= BTRFS_QGROUP_STATUS_FLAG_INCONSISTENT;
2725 btrfs_info(fs_info,
2726 "unable to update quota limit for %llu",
2727 dstgroup->qgroupid);
2728 goto unlock;
2729 }
2730 }
2731
2732 if (srcid) {
2733 srcgroup = find_qgroup_rb(fs_info, srcid);
2734 if (!srcgroup)
2735 goto unlock;
2736
2737 /*
2738 * We call inherit after we clone the root in order to make sure
2739 * our counts don't go crazy, so at this point the only
2740 * difference between the two roots should be the root node.
2741 */
2742 level_size = fs_info->nodesize;
2743 dstgroup->rfer = srcgroup->rfer;
2744 dstgroup->rfer_cmpr = srcgroup->rfer_cmpr;
2745 dstgroup->excl = level_size;
2746 dstgroup->excl_cmpr = level_size;
2747 srcgroup->excl = level_size;
2748 srcgroup->excl_cmpr = level_size;
2749
2750 /* inherit the limit info */
2751 dstgroup->lim_flags = srcgroup->lim_flags;
2752 dstgroup->max_rfer = srcgroup->max_rfer;
2753 dstgroup->max_excl = srcgroup->max_excl;
2754 dstgroup->rsv_rfer = srcgroup->rsv_rfer;
2755 dstgroup->rsv_excl = srcgroup->rsv_excl;
2756
2757 qgroup_dirty(fs_info, dstgroup);
2758 qgroup_dirty(fs_info, srcgroup);
2759 }
2760
2761 if (!inherit)
2762 goto unlock;
2763
2764 i_qgroups = (u64 *)(inherit + 1);
2765 for (i = 0; i < inherit->num_qgroups; ++i) {
2766 if (*i_qgroups) {
2767 ret = add_relation_rb(fs_info, objectid, *i_qgroups);
2768 if (ret)
2769 goto unlock;
2770 }
2771 ++i_qgroups;
2772 }
2773
2774 for (i = 0; i < inherit->num_ref_copies; ++i, i_qgroups += 2) {
2775 struct btrfs_qgroup *src;
2776 struct btrfs_qgroup *dst;
2777
2778 if (!i_qgroups[0] || !i_qgroups[1])
2779 continue;
2780
2781 src = find_qgroup_rb(fs_info, i_qgroups[0]);
2782 dst = find_qgroup_rb(fs_info, i_qgroups[1]);
2783
2784 if (!src || !dst) {
2785 ret = -EINVAL;
2786 goto unlock;
2787 }
2788
2789 dst->rfer = src->rfer - level_size;
2790 dst->rfer_cmpr = src->rfer_cmpr - level_size;
2791 }
2792 for (i = 0; i < inherit->num_excl_copies; ++i, i_qgroups += 2) {
2793 struct btrfs_qgroup *src;
2794 struct btrfs_qgroup *dst;
2795
2796 if (!i_qgroups[0] || !i_qgroups[1])
2797 continue;
2798
2799 src = find_qgroup_rb(fs_info, i_qgroups[0]);
2800 dst = find_qgroup_rb(fs_info, i_qgroups[1]);
2801
2802 if (!src || !dst) {
2803 ret = -EINVAL;
2804 goto unlock;
2805 }
2806
2807 dst->excl = src->excl + level_size;
2808 dst->excl_cmpr = src->excl_cmpr + level_size;
2809 }
2810
2811 unlock:
2812 spin_unlock(&fs_info->qgroup_lock);
2813 out:
2814 if (!committing)
2815 mutex_unlock(&fs_info->qgroup_ioctl_lock);
2816 return ret;
2817 }
2818
2819 /*
2820 * Two limits to commit transaction in advance.
2821 *
2822 * For RATIO, it will be 1/RATIO of the remaining limit as threshold.
2823 * For SIZE, it will be in byte unit as threshold.
2824 */
2825 #define QGROUP_FREE_RATIO 32
2826 #define QGROUP_FREE_SIZE SZ_32M
2827 static bool qgroup_check_limits(struct btrfs_fs_info *fs_info,
2828 const struct btrfs_qgroup *qg, u64 num_bytes)
2829 {
2830 u64 free;
2831 u64 threshold;
2832
2833 if ((qg->lim_flags & BTRFS_QGROUP_LIMIT_MAX_RFER) &&
2834 qgroup_rsv_total(qg) + (s64)qg->rfer + num_bytes > qg->max_rfer)
2835 return false;
2836
2837 if ((qg->lim_flags & BTRFS_QGROUP_LIMIT_MAX_EXCL) &&
2838 qgroup_rsv_total(qg) + (s64)qg->excl + num_bytes > qg->max_excl)
2839 return false;
2840
2841 /*
2842 * Even if we passed the check, it's better to check if reservation
2843 * for meta_pertrans is pushing us near limit.
2844 * If there is too much pertrans reservation or it's near the limit,
2845 * let's try commit transaction to free some, using transaction_kthread
2846 */
2847 if ((qg->lim_flags & (BTRFS_QGROUP_LIMIT_MAX_RFER |
2848 BTRFS_QGROUP_LIMIT_MAX_EXCL))) {
2849 if (qg->lim_flags & BTRFS_QGROUP_LIMIT_MAX_EXCL) {
2850 free = qg->max_excl - qgroup_rsv_total(qg) - qg->excl;
2851 threshold = min_t(u64, qg->max_excl / QGROUP_FREE_RATIO,
2852 QGROUP_FREE_SIZE);
2853 } else {
2854 free = qg->max_rfer - qgroup_rsv_total(qg) - qg->rfer;
2855 threshold = min_t(u64, qg->max_rfer / QGROUP_FREE_RATIO,
2856 QGROUP_FREE_SIZE);
2857 }
2858
2859 /*
2860 * Use transaction_kthread to commit transaction, so we no
2861 * longer need to bother nested transaction nor lock context.
2862 */
2863 if (free < threshold)
2864 btrfs_commit_transaction_locksafe(fs_info);
2865 }
2866
2867 return true;
2868 }
2869
2870 static int qgroup_reserve(struct btrfs_root *root, u64 num_bytes, bool enforce,
2871 enum btrfs_qgroup_rsv_type type)
2872 {
2873 struct btrfs_qgroup *qgroup;
2874 struct btrfs_fs_info *fs_info = root->fs_info;
2875 u64 ref_root = root->root_key.objectid;
2876 int ret = 0;
2877 struct ulist_node *unode;
2878 struct ulist_iterator uiter;
2879
2880 if (!is_fstree(ref_root))
2881 return 0;
2882
2883 if (num_bytes == 0)
2884 return 0;
2885
2886 if (test_bit(BTRFS_FS_QUOTA_OVERRIDE, &fs_info->flags) &&
2887 capable(CAP_SYS_RESOURCE))
2888 enforce = false;
2889
2890 spin_lock(&fs_info->qgroup_lock);
2891 if (!fs_info->quota_root)
2892 goto out;
2893
2894 qgroup = find_qgroup_rb(fs_info, ref_root);
2895 if (!qgroup)
2896 goto out;
2897
2898 /*
2899 * in a first step, we check all affected qgroups if any limits would
2900 * be exceeded
2901 */
2902 ulist_reinit(fs_info->qgroup_ulist);
2903 ret = ulist_add(fs_info->qgroup_ulist, qgroup->qgroupid,
2904 qgroup_to_aux(qgroup), GFP_ATOMIC);
2905 if (ret < 0)
2906 goto out;
2907 ULIST_ITER_INIT(&uiter);
2908 while ((unode = ulist_next(fs_info->qgroup_ulist, &uiter))) {
2909 struct btrfs_qgroup *qg;
2910 struct btrfs_qgroup_list *glist;
2911
2912 qg = unode_aux_to_qgroup(unode);
2913
2914 if (enforce && !qgroup_check_limits(fs_info, qg, num_bytes)) {
2915 ret = -EDQUOT;
2916 goto out;
2917 }
2918
2919 list_for_each_entry(glist, &qg->groups, next_group) {
2920 ret = ulist_add(fs_info->qgroup_ulist,
2921 glist->group->qgroupid,
2922 qgroup_to_aux(glist->group), GFP_ATOMIC);
2923 if (ret < 0)
2924 goto out;
2925 }
2926 }
2927 ret = 0;
2928 /*
2929 * no limits exceeded, now record the reservation into all qgroups
2930 */
2931 ULIST_ITER_INIT(&uiter);
2932 while ((unode = ulist_next(fs_info->qgroup_ulist, &uiter))) {
2933 struct btrfs_qgroup *qg;
2934
2935 qg = unode_aux_to_qgroup(unode);
2936
2937 qgroup_rsv_add(fs_info, qg, num_bytes, type);
2938 }
2939
2940 out:
2941 spin_unlock(&fs_info->qgroup_lock);
2942 return ret;
2943 }
2944
2945 /*
2946 * Free @num_bytes of reserved space with @type for qgroup. (Normally level 0
2947 * qgroup).
2948 *
2949 * Will handle all higher level qgroup too.
2950 *
2951 * NOTE: If @num_bytes is (u64)-1, this means to free all bytes of this qgroup.
2952 * This special case is only used for META_PERTRANS type.
2953 */
2954 void btrfs_qgroup_free_refroot(struct btrfs_fs_info *fs_info,
2955 u64 ref_root, u64 num_bytes,
2956 enum btrfs_qgroup_rsv_type type)
2957 {
2958 struct btrfs_qgroup *qgroup;
2959 struct ulist_node *unode;
2960 struct ulist_iterator uiter;
2961 int ret = 0;
2962
2963 if (!is_fstree(ref_root))
2964 return;
2965
2966 if (num_bytes == 0)
2967 return;
2968
2969 if (num_bytes == (u64)-1 && type != BTRFS_QGROUP_RSV_META_PERTRANS) {
2970 WARN(1, "%s: Invalid type to free", __func__);
2971 return;
2972 }
2973 spin_lock(&fs_info->qgroup_lock);
2974
2975 if (!fs_info->quota_root)
2976 goto out;
2977
2978 qgroup = find_qgroup_rb(fs_info, ref_root);
2979 if (!qgroup)
2980 goto out;
2981
2982 if (num_bytes == (u64)-1)
2983 /*
2984 * We're freeing all pertrans rsv, get reserved value from
2985 * level 0 qgroup as real num_bytes to free.
2986 */
2987 num_bytes = qgroup->rsv.values[type];
2988
2989 ulist_reinit(fs_info->qgroup_ulist);
2990 ret = ulist_add(fs_info->qgroup_ulist, qgroup->qgroupid,
2991 qgroup_to_aux(qgroup), GFP_ATOMIC);
2992 if (ret < 0)
2993 goto out;
2994 ULIST_ITER_INIT(&uiter);
2995 while ((unode = ulist_next(fs_info->qgroup_ulist, &uiter))) {
2996 struct btrfs_qgroup *qg;
2997 struct btrfs_qgroup_list *glist;
2998
2999 qg = unode_aux_to_qgroup(unode);
3000
3001 qgroup_rsv_release(fs_info, qg, num_bytes, type);
3002
3003 list_for_each_entry(glist, &qg->groups, next_group) {
3004 ret = ulist_add(fs_info->qgroup_ulist,
3005 glist->group->qgroupid,
3006 qgroup_to_aux(glist->group), GFP_ATOMIC);
3007 if (ret < 0)
3008 goto out;
3009 }
3010 }
3011
3012 out:
3013 spin_unlock(&fs_info->qgroup_lock);
3014 }
3015
3016 /*
3017 * Check if the leaf is the last leaf. Which means all node pointers
3018 * are at their last position.
3019 */
3020 static bool is_last_leaf(struct btrfs_path *path)
3021 {
3022 int i;
3023
3024 for (i = 1; i < BTRFS_MAX_LEVEL && path->nodes[i]; i++) {
3025 if (path->slots[i] != btrfs_header_nritems(path->nodes[i]) - 1)
3026 return false;
3027 }
3028 return true;
3029 }
3030
3031 /*
3032 * returns < 0 on error, 0 when more leafs are to be scanned.
3033 * returns 1 when done.
3034 */
3035 static int qgroup_rescan_leaf(struct btrfs_trans_handle *trans,
3036 struct btrfs_path *path)
3037 {
3038 struct btrfs_fs_info *fs_info = trans->fs_info;
3039 struct btrfs_key found;
3040 struct extent_buffer *scratch_leaf = NULL;
3041 struct ulist *roots = NULL;
3042 u64 num_bytes;
3043 bool done;
3044 int slot;
3045 int ret;
3046
3047 mutex_lock(&fs_info->qgroup_rescan_lock);
3048 ret = btrfs_search_slot_for_read(fs_info->extent_root,
3049 &fs_info->qgroup_rescan_progress,
3050 path, 1, 0);
3051
3052 btrfs_debug(fs_info,
3053 "current progress key (%llu %u %llu), search_slot ret %d",
3054 fs_info->qgroup_rescan_progress.objectid,
3055 fs_info->qgroup_rescan_progress.type,
3056 fs_info->qgroup_rescan_progress.offset, ret);
3057
3058 if (ret) {
3059 /*
3060 * The rescan is about to end, we will not be scanning any
3061 * further blocks. We cannot unset the RESCAN flag here, because
3062 * we want to commit the transaction if everything went well.
3063 * To make the live accounting work in this phase, we set our
3064 * scan progress pointer such that every real extent objectid
3065 * will be smaller.
3066 */
3067 fs_info->qgroup_rescan_progress.objectid = (u64)-1;
3068 btrfs_release_path(path);
3069 mutex_unlock(&fs_info->qgroup_rescan_lock);
3070 return ret;
3071 }
3072 done = is_last_leaf(path);
3073
3074 btrfs_item_key_to_cpu(path->nodes[0], &found,
3075 btrfs_header_nritems(path->nodes[0]) - 1);
3076 fs_info->qgroup_rescan_progress.objectid = found.objectid + 1;
3077
3078 scratch_leaf = btrfs_clone_extent_buffer(path->nodes[0]);
3079 if (!scratch_leaf) {
3080 ret = -ENOMEM;
3081 mutex_unlock(&fs_info->qgroup_rescan_lock);
3082 goto out;
3083 }
3084 slot = path->slots[0];
3085 btrfs_release_path(path);
3086 mutex_unlock(&fs_info->qgroup_rescan_lock);
3087
3088 for (; slot < btrfs_header_nritems(scratch_leaf); ++slot) {
3089 btrfs_item_key_to_cpu(scratch_leaf, &found, slot);
3090 if (found.type != BTRFS_EXTENT_ITEM_KEY &&
3091 found.type != BTRFS_METADATA_ITEM_KEY)
3092 continue;
3093 if (found.type == BTRFS_METADATA_ITEM_KEY)
3094 num_bytes = fs_info->nodesize;
3095 else
3096 num_bytes = found.offset;
3097
3098 ret = btrfs_find_all_roots(NULL, fs_info, found.objectid, 0,
3099 &roots, false);
3100 if (ret < 0)
3101 goto out;
3102 /* For rescan, just pass old_roots as NULL */
3103 ret = btrfs_qgroup_account_extent(trans, found.objectid,
3104 num_bytes, NULL, roots);
3105 if (ret < 0)
3106 goto out;
3107 }
3108 out:
3109 if (scratch_leaf)
3110 free_extent_buffer(scratch_leaf);
3111
3112 if (done && !ret) {
3113 ret = 1;
3114 fs_info->qgroup_rescan_progress.objectid = (u64)-1;
3115 }
3116 return ret;
3117 }
3118
3119 static void btrfs_qgroup_rescan_worker(struct btrfs_work *work)
3120 {
3121 struct btrfs_fs_info *fs_info = container_of(work, struct btrfs_fs_info,
3122 qgroup_rescan_work);
3123 struct btrfs_path *path;
3124 struct btrfs_trans_handle *trans = NULL;
3125 int err = -ENOMEM;
3126 int ret = 0;
3127
3128 path = btrfs_alloc_path();
3129 if (!path)
3130 goto out;
3131 /*
3132 * Rescan should only search for commit root, and any later difference
3133 * should be recorded by qgroup
3134 */
3135 path->search_commit_root = 1;
3136 path->skip_locking = 1;
3137
3138 err = 0;
3139 while (!err && !btrfs_fs_closing(fs_info)) {
3140 trans = btrfs_start_transaction(fs_info->fs_root, 0);
3141 if (IS_ERR(trans)) {
3142 err = PTR_ERR(trans);
3143 break;
3144 }
3145 if (!test_bit(BTRFS_FS_QUOTA_ENABLED, &fs_info->flags)) {
3146 err = -EINTR;
3147 } else {
3148 err = qgroup_rescan_leaf(trans, path);
3149 }
3150 if (err > 0)
3151 btrfs_commit_transaction(trans);
3152 else
3153 btrfs_end_transaction(trans);
3154 }
3155
3156 out:
3157 btrfs_free_path(path);
3158
3159 mutex_lock(&fs_info->qgroup_rescan_lock);
3160 if (err > 0 &&
3161 fs_info->qgroup_flags & BTRFS_QGROUP_STATUS_FLAG_INCONSISTENT) {
3162 fs_info->qgroup_flags &= ~BTRFS_QGROUP_STATUS_FLAG_INCONSISTENT;
3163 } else if (err < 0) {
3164 fs_info->qgroup_flags |= BTRFS_QGROUP_STATUS_FLAG_INCONSISTENT;
3165 }
3166 mutex_unlock(&fs_info->qgroup_rescan_lock);
3167
3168 /*
3169 * only update status, since the previous part has already updated the
3170 * qgroup info.
3171 */
3172 trans = btrfs_start_transaction(fs_info->quota_root, 1);
3173 if (IS_ERR(trans)) {
3174 err = PTR_ERR(trans);
3175 trans = NULL;
3176 btrfs_err(fs_info,
3177 "fail to start transaction for status update: %d",
3178 err);
3179 }
3180
3181 mutex_lock(&fs_info->qgroup_rescan_lock);
3182 if (!btrfs_fs_closing(fs_info))
3183 fs_info->qgroup_flags &= ~BTRFS_QGROUP_STATUS_FLAG_RESCAN;
3184 if (trans) {
3185 ret = update_qgroup_status_item(trans);
3186 if (ret < 0) {
3187 err = ret;
3188 btrfs_err(fs_info, "fail to update qgroup status: %d",
3189 err);
3190 }
3191 }
3192 fs_info->qgroup_rescan_running = false;
3193 complete_all(&fs_info->qgroup_rescan_completion);
3194 mutex_unlock(&fs_info->qgroup_rescan_lock);
3195
3196 if (!trans)
3197 return;
3198
3199 btrfs_end_transaction(trans);
3200
3201 if (btrfs_fs_closing(fs_info)) {
3202 btrfs_info(fs_info, "qgroup scan paused");
3203 } else if (err >= 0) {
3204 btrfs_info(fs_info, "qgroup scan completed%s",
3205 err > 0 ? " (inconsistency flag cleared)" : "");
3206 } else {
3207 btrfs_err(fs_info, "qgroup scan failed with %d", err);
3208 }
3209 }
3210
3211 /*
3212 * Checks that (a) no rescan is running and (b) quota is enabled. Allocates all
3213 * memory required for the rescan context.
3214 */
3215 static int
3216 qgroup_rescan_init(struct btrfs_fs_info *fs_info, u64 progress_objectid,
3217 int init_flags)
3218 {
3219 int ret = 0;
3220
3221 if (!init_flags) {
3222 /* we're resuming qgroup rescan at mount time */
3223 if (!(fs_info->qgroup_flags &
3224 BTRFS_QGROUP_STATUS_FLAG_RESCAN)) {
3225 btrfs_warn(fs_info,
3226 "qgroup rescan init failed, qgroup rescan is not queued");
3227 ret = -EINVAL;
3228 } else if (!(fs_info->qgroup_flags &
3229 BTRFS_QGROUP_STATUS_FLAG_ON)) {
3230 btrfs_warn(fs_info,
3231 "qgroup rescan init failed, qgroup is not enabled");
3232 ret = -EINVAL;
3233 }
3234
3235 if (ret)
3236 return ret;
3237 }
3238
3239 mutex_lock(&fs_info->qgroup_rescan_lock);
3240 spin_lock(&fs_info->qgroup_lock);
3241
3242 if (init_flags) {
3243 if (fs_info->qgroup_flags & BTRFS_QGROUP_STATUS_FLAG_RESCAN) {
3244 btrfs_warn(fs_info,
3245 "qgroup rescan is already in progress");
3246 ret = -EINPROGRESS;
3247 } else if (!(fs_info->qgroup_flags &
3248 BTRFS_QGROUP_STATUS_FLAG_ON)) {
3249 btrfs_warn(fs_info,
3250 "qgroup rescan init failed, qgroup is not enabled");
3251 ret = -EINVAL;
3252 }
3253
3254 if (ret) {
3255 spin_unlock(&fs_info->qgroup_lock);
3256 mutex_unlock(&fs_info->qgroup_rescan_lock);
3257 return ret;
3258 }
3259 fs_info->qgroup_flags |= BTRFS_QGROUP_STATUS_FLAG_RESCAN;
3260 }
3261
3262 memset(&fs_info->qgroup_rescan_progress, 0,
3263 sizeof(fs_info->qgroup_rescan_progress));
3264 fs_info->qgroup_rescan_progress.objectid = progress_objectid;
3265 init_completion(&fs_info->qgroup_rescan_completion);
3266 fs_info->qgroup_rescan_running = true;
3267
3268 spin_unlock(&fs_info->qgroup_lock);
3269 mutex_unlock(&fs_info->qgroup_rescan_lock);
3270
3271 btrfs_init_work(&fs_info->qgroup_rescan_work,
3272 btrfs_qgroup_rescan_worker, NULL, NULL);
3273 return 0;
3274 }
3275
3276 static void
3277 qgroup_rescan_zero_tracking(struct btrfs_fs_info *fs_info)
3278 {
3279 struct rb_node *n;
3280 struct btrfs_qgroup *qgroup;
3281
3282 spin_lock(&fs_info->qgroup_lock);
3283 /* clear all current qgroup tracking information */
3284 for (n = rb_first(&fs_info->qgroup_tree); n; n = rb_next(n)) {
3285 qgroup = rb_entry(n, struct btrfs_qgroup, node);
3286 qgroup->rfer = 0;
3287 qgroup->rfer_cmpr = 0;
3288 qgroup->excl = 0;
3289 qgroup->excl_cmpr = 0;
3290 qgroup_dirty(fs_info, qgroup);
3291 }
3292 spin_unlock(&fs_info->qgroup_lock);
3293 }
3294
3295 int
3296 btrfs_qgroup_rescan(struct btrfs_fs_info *fs_info)
3297 {
3298 int ret = 0;
3299 struct btrfs_trans_handle *trans;
3300
3301 ret = qgroup_rescan_init(fs_info, 0, 1);
3302 if (ret)
3303 return ret;
3304
3305 /*
3306 * We have set the rescan_progress to 0, which means no more
3307 * delayed refs will be accounted by btrfs_qgroup_account_ref.
3308 * However, btrfs_qgroup_account_ref may be right after its call
3309 * to btrfs_find_all_roots, in which case it would still do the
3310 * accounting.
3311 * To solve this, we're committing the transaction, which will
3312 * ensure we run all delayed refs and only after that, we are
3313 * going to clear all tracking information for a clean start.
3314 */
3315
3316 trans = btrfs_join_transaction(fs_info->fs_root);
3317 if (IS_ERR(trans)) {
3318 fs_info->qgroup_flags &= ~BTRFS_QGROUP_STATUS_FLAG_RESCAN;
3319 return PTR_ERR(trans);
3320 }
3321 ret = btrfs_commit_transaction(trans);
3322 if (ret) {
3323 fs_info->qgroup_flags &= ~BTRFS_QGROUP_STATUS_FLAG_RESCAN;
3324 return ret;
3325 }
3326
3327 qgroup_rescan_zero_tracking(fs_info);
3328
3329 btrfs_queue_work(fs_info->qgroup_rescan_workers,
3330 &fs_info->qgroup_rescan_work);
3331
3332 return 0;
3333 }
3334
3335 int btrfs_qgroup_wait_for_completion(struct btrfs_fs_info *fs_info,
3336 bool interruptible)
3337 {
3338 int running;
3339 int ret = 0;
3340
3341 mutex_lock(&fs_info->qgroup_rescan_lock);
3342 spin_lock(&fs_info->qgroup_lock);
3343 running = fs_info->qgroup_rescan_running;
3344 spin_unlock(&fs_info->qgroup_lock);
3345 mutex_unlock(&fs_info->qgroup_rescan_lock);
3346
3347 if (!running)
3348 return 0;
3349
3350 if (interruptible)
3351 ret = wait_for_completion_interruptible(
3352 &fs_info->qgroup_rescan_completion);
3353 else
3354 wait_for_completion(&fs_info->qgroup_rescan_completion);
3355
3356 return ret;
3357 }
3358
3359 /*
3360 * this is only called from open_ctree where we're still single threaded, thus
3361 * locking is omitted here.
3362 */
3363 void
3364 btrfs_qgroup_rescan_resume(struct btrfs_fs_info *fs_info)
3365 {
3366 if (fs_info->qgroup_flags & BTRFS_QGROUP_STATUS_FLAG_RESCAN)
3367 btrfs_queue_work(fs_info->qgroup_rescan_workers,
3368 &fs_info->qgroup_rescan_work);
3369 }
3370
3371 /*
3372 * Reserve qgroup space for range [start, start + len).
3373 *
3374 * This function will either reserve space from related qgroups or doing
3375 * nothing if the range is already reserved.
3376 *
3377 * Return 0 for successful reserve
3378 * Return <0 for error (including -EQUOT)
3379 *
3380 * NOTE: this function may sleep for memory allocation.
3381 * if btrfs_qgroup_reserve_data() is called multiple times with
3382 * same @reserved, caller must ensure when error happens it's OK
3383 * to free *ALL* reserved space.
3384 */
3385 int btrfs_qgroup_reserve_data(struct inode *inode,
3386 struct extent_changeset **reserved_ret, u64 start,
3387 u64 len)
3388 {
3389 struct btrfs_root *root = BTRFS_I(inode)->root;
3390 struct ulist_node *unode;
3391 struct ulist_iterator uiter;
3392 struct extent_changeset *reserved;
3393 u64 orig_reserved;
3394 u64 to_reserve;
3395 int ret;
3396
3397 if (!test_bit(BTRFS_FS_QUOTA_ENABLED, &root->fs_info->flags) ||
3398 !is_fstree(root->root_key.objectid) || len == 0)
3399 return 0;
3400
3401 /* @reserved parameter is mandatory for qgroup */
3402 if (WARN_ON(!reserved_ret))
3403 return -EINVAL;
3404 if (!*reserved_ret) {
3405 *reserved_ret = extent_changeset_alloc();
3406 if (!*reserved_ret)
3407 return -ENOMEM;
3408 }
3409 reserved = *reserved_ret;
3410 /* Record already reserved space */
3411 orig_reserved = reserved->bytes_changed;
3412 ret = set_record_extent_bits(&BTRFS_I(inode)->io_tree, start,
3413 start + len -1, EXTENT_QGROUP_RESERVED, reserved);
3414
3415 /* Newly reserved space */
3416 to_reserve = reserved->bytes_changed - orig_reserved;
3417 trace_btrfs_qgroup_reserve_data(inode, start, len,
3418 to_reserve, QGROUP_RESERVE);
3419 if (ret < 0)
3420 goto cleanup;
3421 ret = qgroup_reserve(root, to_reserve, true, BTRFS_QGROUP_RSV_DATA);
3422 if (ret < 0)
3423 goto cleanup;
3424
3425 return ret;
3426
3427 cleanup:
3428 /* cleanup *ALL* already reserved ranges */
3429 ULIST_ITER_INIT(&uiter);
3430 while ((unode = ulist_next(&reserved->range_changed, &uiter)))
3431 clear_extent_bit(&BTRFS_I(inode)->io_tree, unode->val,
3432 unode->aux, EXTENT_QGROUP_RESERVED, 0, 0, NULL);
3433 /* Also free data bytes of already reserved one */
3434 btrfs_qgroup_free_refroot(root->fs_info, root->root_key.objectid,
3435 orig_reserved, BTRFS_QGROUP_RSV_DATA);
3436 extent_changeset_release(reserved);
3437 return ret;
3438 }
3439
3440 /* Free ranges specified by @reserved, normally in error path */
3441 static int qgroup_free_reserved_data(struct inode *inode,
3442 struct extent_changeset *reserved, u64 start, u64 len)
3443 {
3444 struct btrfs_root *root = BTRFS_I(inode)->root;
3445 struct ulist_node *unode;
3446 struct ulist_iterator uiter;
3447 struct extent_changeset changeset;
3448 int freed = 0;
3449 int ret;
3450
3451 extent_changeset_init(&changeset);
3452 len = round_up(start + len, root->fs_info->sectorsize);
3453 start = round_down(start, root->fs_info->sectorsize);
3454
3455 ULIST_ITER_INIT(&uiter);
3456 while ((unode = ulist_next(&reserved->range_changed, &uiter))) {
3457 u64 range_start = unode->val;
3458 /* unode->aux is the inclusive end */
3459 u64 range_len = unode->aux - range_start + 1;
3460 u64 free_start;
3461 u64 free_len;
3462
3463 extent_changeset_release(&changeset);
3464
3465 /* Only free range in range [start, start + len) */
3466 if (range_start >= start + len ||
3467 range_start + range_len <= start)
3468 continue;
3469 free_start = max(range_start, start);
3470 free_len = min(start + len, range_start + range_len) -
3471 free_start;
3472 /*
3473 * TODO: To also modify reserved->ranges_reserved to reflect
3474 * the modification.
3475 *
3476 * However as long as we free qgroup reserved according to
3477 * EXTENT_QGROUP_RESERVED, we won't double free.
3478 * So not need to rush.
3479 */
3480 ret = clear_record_extent_bits(&BTRFS_I(inode)->io_tree,
3481 free_start, free_start + free_len - 1,
3482 EXTENT_QGROUP_RESERVED, &changeset);
3483 if (ret < 0)
3484 goto out;
3485 freed += changeset.bytes_changed;
3486 }
3487 btrfs_qgroup_free_refroot(root->fs_info, root->root_key.objectid, freed,
3488 BTRFS_QGROUP_RSV_DATA);
3489 ret = freed;
3490 out:
3491 extent_changeset_release(&changeset);
3492 return ret;
3493 }
3494
3495 static int __btrfs_qgroup_release_data(struct inode *inode,
3496 struct extent_changeset *reserved, u64 start, u64 len,
3497 int free)
3498 {
3499 struct extent_changeset changeset;
3500 int trace_op = QGROUP_RELEASE;
3501 int ret;
3502
3503 if (!test_bit(BTRFS_FS_QUOTA_ENABLED,
3504 &BTRFS_I(inode)->root->fs_info->flags))
3505 return 0;
3506
3507 /* In release case, we shouldn't have @reserved */
3508 WARN_ON(!free && reserved);
3509 if (free && reserved)
3510 return qgroup_free_reserved_data(inode, reserved, start, len);
3511 extent_changeset_init(&changeset);
3512 ret = clear_record_extent_bits(&BTRFS_I(inode)->io_tree, start,
3513 start + len -1, EXTENT_QGROUP_RESERVED, &changeset);
3514 if (ret < 0)
3515 goto out;
3516
3517 if (free)
3518 trace_op = QGROUP_FREE;
3519 trace_btrfs_qgroup_release_data(inode, start, len,
3520 changeset.bytes_changed, trace_op);
3521 if (free)
3522 btrfs_qgroup_free_refroot(BTRFS_I(inode)->root->fs_info,
3523 BTRFS_I(inode)->root->root_key.objectid,
3524 changeset.bytes_changed, BTRFS_QGROUP_RSV_DATA);
3525 ret = changeset.bytes_changed;
3526 out:
3527 extent_changeset_release(&changeset);
3528 return ret;
3529 }
3530
3531 /*
3532 * Free a reserved space range from io_tree and related qgroups
3533 *
3534 * Should be called when a range of pages get invalidated before reaching disk.
3535 * Or for error cleanup case.
3536 * if @reserved is given, only reserved range in [@start, @start + @len) will
3537 * be freed.
3538 *
3539 * For data written to disk, use btrfs_qgroup_release_data().
3540 *
3541 * NOTE: This function may sleep for memory allocation.
3542 */
3543 int btrfs_qgroup_free_data(struct inode *inode,
3544 struct extent_changeset *reserved, u64 start, u64 len)
3545 {
3546 return __btrfs_qgroup_release_data(inode, reserved, start, len, 1);
3547 }
3548
3549 /*
3550 * Release a reserved space range from io_tree only.
3551 *
3552 * Should be called when a range of pages get written to disk and corresponding
3553 * FILE_EXTENT is inserted into corresponding root.
3554 *
3555 * Since new qgroup accounting framework will only update qgroup numbers at
3556 * commit_transaction() time, its reserved space shouldn't be freed from
3557 * related qgroups.
3558 *
3559 * But we should release the range from io_tree, to allow further write to be
3560 * COWed.
3561 *
3562 * NOTE: This function may sleep for memory allocation.
3563 */
3564 int btrfs_qgroup_release_data(struct inode *inode, u64 start, u64 len)
3565 {
3566 return __btrfs_qgroup_release_data(inode, NULL, start, len, 0);
3567 }
3568
3569 static void add_root_meta_rsv(struct btrfs_root *root, int num_bytes,
3570 enum btrfs_qgroup_rsv_type type)
3571 {
3572 if (type != BTRFS_QGROUP_RSV_META_PREALLOC &&
3573 type != BTRFS_QGROUP_RSV_META_PERTRANS)
3574 return;
3575 if (num_bytes == 0)
3576 return;
3577
3578 spin_lock(&root->qgroup_meta_rsv_lock);
3579 if (type == BTRFS_QGROUP_RSV_META_PREALLOC)
3580 root->qgroup_meta_rsv_prealloc += num_bytes;
3581 else
3582 root->qgroup_meta_rsv_pertrans += num_bytes;
3583 spin_unlock(&root->qgroup_meta_rsv_lock);
3584 }
3585
3586 static int sub_root_meta_rsv(struct btrfs_root *root, int num_bytes,
3587 enum btrfs_qgroup_rsv_type type)
3588 {
3589 if (type != BTRFS_QGROUP_RSV_META_PREALLOC &&
3590 type != BTRFS_QGROUP_RSV_META_PERTRANS)
3591 return 0;
3592 if (num_bytes == 0)
3593 return 0;
3594
3595 spin_lock(&root->qgroup_meta_rsv_lock);
3596 if (type == BTRFS_QGROUP_RSV_META_PREALLOC) {
3597 num_bytes = min_t(u64, root->qgroup_meta_rsv_prealloc,
3598 num_bytes);
3599 root->qgroup_meta_rsv_prealloc -= num_bytes;
3600 } else {
3601 num_bytes = min_t(u64, root->qgroup_meta_rsv_pertrans,
3602 num_bytes);
3603 root->qgroup_meta_rsv_pertrans -= num_bytes;
3604 }
3605 spin_unlock(&root->qgroup_meta_rsv_lock);
3606 return num_bytes;
3607 }
3608
3609 int __btrfs_qgroup_reserve_meta(struct btrfs_root *root, int num_bytes,
3610 enum btrfs_qgroup_rsv_type type, bool enforce)
3611 {
3612 struct btrfs_fs_info *fs_info = root->fs_info;
3613 int ret;
3614
3615 if (!test_bit(BTRFS_FS_QUOTA_ENABLED, &fs_info->flags) ||
3616 !is_fstree(root->root_key.objectid) || num_bytes == 0)
3617 return 0;
3618
3619 BUG_ON(num_bytes != round_down(num_bytes, fs_info->nodesize));
3620 trace_qgroup_meta_reserve(root, (s64)num_bytes, type);
3621 ret = qgroup_reserve(root, num_bytes, enforce, type);
3622 if (ret < 0)
3623 return ret;
3624 /*
3625 * Record what we have reserved into root.
3626 *
3627 * To avoid quota disabled->enabled underflow.
3628 * In that case, we may try to free space we haven't reserved
3629 * (since quota was disabled), so record what we reserved into root.
3630 * And ensure later release won't underflow this number.
3631 */
3632 add_root_meta_rsv(root, num_bytes, type);
3633 return ret;
3634 }
3635
3636 void btrfs_qgroup_free_meta_all_pertrans(struct btrfs_root *root)
3637 {
3638 struct btrfs_fs_info *fs_info = root->fs_info;
3639
3640 if (!test_bit(BTRFS_FS_QUOTA_ENABLED, &fs_info->flags) ||
3641 !is_fstree(root->root_key.objectid))
3642 return;
3643
3644 /* TODO: Update trace point to handle such free */
3645 trace_qgroup_meta_free_all_pertrans(root);
3646 /* Special value -1 means to free all reserved space */
3647 btrfs_qgroup_free_refroot(fs_info, root->root_key.objectid, (u64)-1,
3648 BTRFS_QGROUP_RSV_META_PERTRANS);
3649 }
3650
3651 void __btrfs_qgroup_free_meta(struct btrfs_root *root, int num_bytes,
3652 enum btrfs_qgroup_rsv_type type)
3653 {
3654 struct btrfs_fs_info *fs_info = root->fs_info;
3655
3656 if (!test_bit(BTRFS_FS_QUOTA_ENABLED, &fs_info->flags) ||
3657 !is_fstree(root->root_key.objectid))
3658 return;
3659
3660 /*
3661 * reservation for META_PREALLOC can happen before quota is enabled,
3662 * which can lead to underflow.
3663 * Here ensure we will only free what we really have reserved.
3664 */
3665 num_bytes = sub_root_meta_rsv(root, num_bytes, type);
3666 BUG_ON(num_bytes != round_down(num_bytes, fs_info->nodesize));
3667 trace_qgroup_meta_reserve(root, -(s64)num_bytes, type);
3668 btrfs_qgroup_free_refroot(fs_info, root->root_key.objectid,
3669 num_bytes, type);
3670 }
3671
3672 static void qgroup_convert_meta(struct btrfs_fs_info *fs_info, u64 ref_root,
3673 int num_bytes)
3674 {
3675 struct btrfs_qgroup *qgroup;
3676 struct ulist_node *unode;
3677 struct ulist_iterator uiter;
3678 int ret = 0;
3679
3680 if (num_bytes == 0)
3681 return;
3682 if (!fs_info->quota_root)
3683 return;
3684
3685 spin_lock(&fs_info->qgroup_lock);
3686 qgroup = find_qgroup_rb(fs_info, ref_root);
3687 if (!qgroup)
3688 goto out;
3689 ulist_reinit(fs_info->qgroup_ulist);
3690 ret = ulist_add(fs_info->qgroup_ulist, qgroup->qgroupid,
3691 qgroup_to_aux(qgroup), GFP_ATOMIC);
3692 if (ret < 0)
3693 goto out;
3694 ULIST_ITER_INIT(&uiter);
3695 while ((unode = ulist_next(fs_info->qgroup_ulist, &uiter))) {
3696 struct btrfs_qgroup *qg;
3697 struct btrfs_qgroup_list *glist;
3698
3699 qg = unode_aux_to_qgroup(unode);
3700
3701 qgroup_rsv_release(fs_info, qg, num_bytes,
3702 BTRFS_QGROUP_RSV_META_PREALLOC);
3703 qgroup_rsv_add(fs_info, qg, num_bytes,
3704 BTRFS_QGROUP_RSV_META_PERTRANS);
3705 list_for_each_entry(glist, &qg->groups, next_group) {
3706 ret = ulist_add(fs_info->qgroup_ulist,
3707 glist->group->qgroupid,
3708 qgroup_to_aux(glist->group), GFP_ATOMIC);
3709 if (ret < 0)
3710 goto out;
3711 }
3712 }
3713 out:
3714 spin_unlock(&fs_info->qgroup_lock);
3715 }
3716
3717 void btrfs_qgroup_convert_reserved_meta(struct btrfs_root *root, int num_bytes)
3718 {
3719 struct btrfs_fs_info *fs_info = root->fs_info;
3720
3721 if (!test_bit(BTRFS_FS_QUOTA_ENABLED, &fs_info->flags) ||
3722 !is_fstree(root->root_key.objectid))
3723 return;
3724 /* Same as btrfs_qgroup_free_meta_prealloc() */
3725 num_bytes = sub_root_meta_rsv(root, num_bytes,
3726 BTRFS_QGROUP_RSV_META_PREALLOC);
3727 trace_qgroup_meta_convert(root, num_bytes);
3728 qgroup_convert_meta(fs_info, root->root_key.objectid, num_bytes);
3729 }
3730
3731 /*
3732 * Check qgroup reserved space leaking, normally at destroy inode
3733 * time
3734 */
3735 void btrfs_qgroup_check_reserved_leak(struct inode *inode)
3736 {
3737 struct extent_changeset changeset;
3738 struct ulist_node *unode;
3739 struct ulist_iterator iter;
3740 int ret;
3741
3742 extent_changeset_init(&changeset);
3743 ret = clear_record_extent_bits(&BTRFS_I(inode)->io_tree, 0, (u64)-1,
3744 EXTENT_QGROUP_RESERVED, &changeset);
3745
3746 WARN_ON(ret < 0);
3747 if (WARN_ON(changeset.bytes_changed)) {
3748 ULIST_ITER_INIT(&iter);
3749 while ((unode = ulist_next(&changeset.range_changed, &iter))) {
3750 btrfs_warn(BTRFS_I(inode)->root->fs_info,
3751 "leaking qgroup reserved space, ino: %lu, start: %llu, end: %llu",
3752 inode->i_ino, unode->val, unode->aux);
3753 }
3754 btrfs_qgroup_free_refroot(BTRFS_I(inode)->root->fs_info,
3755 BTRFS_I(inode)->root->root_key.objectid,
3756 changeset.bytes_changed, BTRFS_QGROUP_RSV_DATA);
3757
3758 }
3759 extent_changeset_release(&changeset);
3760 }
3761
3762 void btrfs_qgroup_init_swapped_blocks(
3763 struct btrfs_qgroup_swapped_blocks *swapped_blocks)
3764 {
3765 int i;
3766
3767 spin_lock_init(&swapped_blocks->lock);
3768 for (i = 0; i < BTRFS_MAX_LEVEL; i++)
3769 swapped_blocks->blocks[i] = RB_ROOT;
3770 swapped_blocks->swapped = false;
3771 }
3772
3773 /*
3774 * Delete all swapped blocks record of @root.
3775 * Every record here means we skipped a full subtree scan for qgroup.
3776 *
3777 * Gets called when committing one transaction.
3778 */
3779 void btrfs_qgroup_clean_swapped_blocks(struct btrfs_root *root)
3780 {
3781 struct btrfs_qgroup_swapped_blocks *swapped_blocks;
3782 int i;
3783
3784 swapped_blocks = &root->swapped_blocks;
3785
3786 spin_lock(&swapped_blocks->lock);
3787 if (!swapped_blocks->swapped)
3788 goto out;
3789 for (i = 0; i < BTRFS_MAX_LEVEL; i++) {
3790 struct rb_root *cur_root = &swapped_blocks->blocks[i];
3791 struct btrfs_qgroup_swapped_block *entry;
3792 struct btrfs_qgroup_swapped_block *next;
3793
3794 rbtree_postorder_for_each_entry_safe(entry, next, cur_root,
3795 node)
3796 kfree(entry);
3797 swapped_blocks->blocks[i] = RB_ROOT;
3798 }
3799 swapped_blocks->swapped = false;
3800 out:
3801 spin_unlock(&swapped_blocks->lock);
3802 }
3803
3804 /*
3805 * Add subtree roots record into @subvol_root.
3806 *
3807 * @subvol_root: tree root of the subvolume tree get swapped
3808 * @bg: block group under balance
3809 * @subvol_parent/slot: pointer to the subtree root in subvolume tree
3810 * @reloc_parent/slot: pointer to the subtree root in reloc tree
3811 * BOTH POINTERS ARE BEFORE TREE SWAP
3812 * @last_snapshot: last snapshot generation of the subvolume tree
3813 */
3814 int btrfs_qgroup_add_swapped_blocks(struct btrfs_trans_handle *trans,
3815 struct btrfs_root *subvol_root,
3816 struct btrfs_block_group *bg,
3817 struct extent_buffer *subvol_parent, int subvol_slot,
3818 struct extent_buffer *reloc_parent, int reloc_slot,
3819 u64 last_snapshot)
3820 {
3821 struct btrfs_fs_info *fs_info = subvol_root->fs_info;
3822 struct btrfs_qgroup_swapped_blocks *blocks = &subvol_root->swapped_blocks;
3823 struct btrfs_qgroup_swapped_block *block;
3824 struct rb_node **cur;
3825 struct rb_node *parent = NULL;
3826 int level = btrfs_header_level(subvol_parent) - 1;
3827 int ret = 0;
3828
3829 if (!test_bit(BTRFS_FS_QUOTA_ENABLED, &fs_info->flags))
3830 return 0;
3831
3832 if (btrfs_node_ptr_generation(subvol_parent, subvol_slot) >
3833 btrfs_node_ptr_generation(reloc_parent, reloc_slot)) {
3834 btrfs_err_rl(fs_info,
3835 "%s: bad parameter order, subvol_gen=%llu reloc_gen=%llu",
3836 __func__,
3837 btrfs_node_ptr_generation(subvol_parent, subvol_slot),
3838 btrfs_node_ptr_generation(reloc_parent, reloc_slot));
3839 return -EUCLEAN;
3840 }
3841
3842 block = kmalloc(sizeof(*block), GFP_NOFS);
3843 if (!block) {
3844 ret = -ENOMEM;
3845 goto out;
3846 }
3847
3848 /*
3849 * @reloc_parent/slot is still before swap, while @block is going to
3850 * record the bytenr after swap, so we do the swap here.
3851 */
3852 block->subvol_bytenr = btrfs_node_blockptr(reloc_parent, reloc_slot);
3853 block->subvol_generation = btrfs_node_ptr_generation(reloc_parent,
3854 reloc_slot);
3855 block->reloc_bytenr = btrfs_node_blockptr(subvol_parent, subvol_slot);
3856 block->reloc_generation = btrfs_node_ptr_generation(subvol_parent,
3857 subvol_slot);
3858 block->last_snapshot = last_snapshot;
3859 block->level = level;
3860
3861 /*
3862 * If we have bg == NULL, we're called from btrfs_recover_relocation(),
3863 * no one else can modify tree blocks thus we qgroup will not change
3864 * no matter the value of trace_leaf.
3865 */
3866 if (bg && bg->flags & BTRFS_BLOCK_GROUP_DATA)
3867 block->trace_leaf = true;
3868 else
3869 block->trace_leaf = false;
3870 btrfs_node_key_to_cpu(reloc_parent, &block->first_key, reloc_slot);
3871
3872 /* Insert @block into @blocks */
3873 spin_lock(&blocks->lock);
3874 cur = &blocks->blocks[level].rb_node;
3875 while (*cur) {
3876 struct btrfs_qgroup_swapped_block *entry;
3877
3878 parent = *cur;
3879 entry = rb_entry(parent, struct btrfs_qgroup_swapped_block,
3880 node);
3881
3882 if (entry->subvol_bytenr < block->subvol_bytenr) {
3883 cur = &(*cur)->rb_left;
3884 } else if (entry->subvol_bytenr > block->subvol_bytenr) {
3885 cur = &(*cur)->rb_right;
3886 } else {
3887 if (entry->subvol_generation !=
3888 block->subvol_generation ||
3889 entry->reloc_bytenr != block->reloc_bytenr ||
3890 entry->reloc_generation !=
3891 block->reloc_generation) {
3892 /*
3893 * Duplicated but mismatch entry found.
3894 * Shouldn't happen.
3895 *
3896 * Marking qgroup inconsistent should be enough
3897 * for end users.
3898 */
3899 WARN_ON(IS_ENABLED(CONFIG_BTRFS_DEBUG));
3900 ret = -EEXIST;
3901 }
3902 kfree(block);
3903 goto out_unlock;
3904 }
3905 }
3906 rb_link_node(&block->node, parent, cur);
3907 rb_insert_color(&block->node, &blocks->blocks[level]);
3908 blocks->swapped = true;
3909 out_unlock:
3910 spin_unlock(&blocks->lock);
3911 out:
3912 if (ret < 0)
3913 fs_info->qgroup_flags |=
3914 BTRFS_QGROUP_STATUS_FLAG_INCONSISTENT;
3915 return ret;
3916 }
3917
3918 /*
3919 * Check if the tree block is a subtree root, and if so do the needed
3920 * delayed subtree trace for qgroup.
3921 *
3922 * This is called during btrfs_cow_block().
3923 */
3924 int btrfs_qgroup_trace_subtree_after_cow(struct btrfs_trans_handle *trans,
3925 struct btrfs_root *root,
3926 struct extent_buffer *subvol_eb)
3927 {
3928 struct btrfs_fs_info *fs_info = root->fs_info;
3929 struct btrfs_qgroup_swapped_blocks *blocks = &root->swapped_blocks;
3930 struct btrfs_qgroup_swapped_block *block;
3931 struct extent_buffer *reloc_eb = NULL;
3932 struct rb_node *node;
3933 bool found = false;
3934 bool swapped = false;
3935 int level = btrfs_header_level(subvol_eb);
3936 int ret = 0;
3937 int i;
3938
3939 if (!test_bit(BTRFS_FS_QUOTA_ENABLED, &fs_info->flags))
3940 return 0;
3941 if (!is_fstree(root->root_key.objectid) || !root->reloc_root)
3942 return 0;
3943
3944 spin_lock(&blocks->lock);
3945 if (!blocks->swapped) {
3946 spin_unlock(&blocks->lock);
3947 return 0;
3948 }
3949 node = blocks->blocks[level].rb_node;
3950
3951 while (node) {
3952 block = rb_entry(node, struct btrfs_qgroup_swapped_block, node);
3953 if (block->subvol_bytenr < subvol_eb->start) {
3954 node = node->rb_left;
3955 } else if (block->subvol_bytenr > subvol_eb->start) {
3956 node = node->rb_right;
3957 } else {
3958 found = true;
3959 break;
3960 }
3961 }
3962 if (!found) {
3963 spin_unlock(&blocks->lock);
3964 goto out;
3965 }
3966 /* Found one, remove it from @blocks first and update blocks->swapped */
3967 rb_erase(&block->node, &blocks->blocks[level]);
3968 for (i = 0; i < BTRFS_MAX_LEVEL; i++) {
3969 if (RB_EMPTY_ROOT(&blocks->blocks[i])) {
3970 swapped = true;
3971 break;
3972 }
3973 }
3974 blocks->swapped = swapped;
3975 spin_unlock(&blocks->lock);
3976
3977 /* Read out reloc subtree root */
3978 reloc_eb = read_tree_block(fs_info, block->reloc_bytenr,
3979 block->reloc_generation, block->level,
3980 &block->first_key);
3981 if (IS_ERR(reloc_eb)) {
3982 ret = PTR_ERR(reloc_eb);
3983 reloc_eb = NULL;
3984 goto free_out;
3985 }
3986 if (!extent_buffer_uptodate(reloc_eb)) {
3987 ret = -EIO;
3988 goto free_out;
3989 }
3990
3991 ret = qgroup_trace_subtree_swap(trans, reloc_eb, subvol_eb,
3992 block->last_snapshot, block->trace_leaf);
3993 free_out:
3994 kfree(block);
3995 free_extent_buffer(reloc_eb);
3996 out:
3997 if (ret < 0) {
3998 btrfs_err_rl(fs_info,
3999 "failed to account subtree at bytenr %llu: %d",
4000 subvol_eb->start, ret);
4001 fs_info->qgroup_flags |= BTRFS_QGROUP_STATUS_FLAG_INCONSISTENT;
4002 }
4003 return ret;
4004 }
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