]> git.proxmox.com Git - mirror_ubuntu-hirsute-kernel.git/blob - fs/btrfs/qgroup.c
projects / mirror_ubuntu-hirsute-kernel.git / blob
? search:
summary | shortlog | log | commit | commitdiff | tree
blame | history | raw | HEAD
mm: vmalloc: show number of vmalloc pages in /proc/meminfo
[mirror_ubuntu-hirsute-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
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_root *quota_root;
1247 struct btrfs_qgroup *parent;
1248 struct btrfs_qgroup *member;
1249 struct btrfs_qgroup_list *list;
1250 struct ulist *tmp;
1251 int ret = 0;
1252
1253 /* Check the level of src and dst first */
1254 if (btrfs_qgroup_level(src) >= btrfs_qgroup_level(dst))
1255 return -EINVAL;
1256
1257 tmp = ulist_alloc(GFP_KERNEL);
1258 if (!tmp)
1259 return -ENOMEM;
1260
1261 mutex_lock(&fs_info->qgroup_ioctl_lock);
1262 quota_root = fs_info->quota_root;
1263 if (!quota_root) {
1264 ret = -EINVAL;
1265 goto out;
1266 }
1267 member = find_qgroup_rb(fs_info, src);
1268 parent = find_qgroup_rb(fs_info, dst);
1269 if (!member || !parent) {
1270 ret = -EINVAL;
1271 goto out;
1272 }
1273
1274 /* check if such qgroup relation exist firstly */
1275 list_for_each_entry(list, &member->groups, next_group) {
1276 if (list->group == parent) {
1277 ret = -EEXIST;
1278 goto out;
1279 }
1280 }
1281
1282 ret = add_qgroup_relation_item(trans, src, dst);
1283 if (ret)
1284 goto out;
1285
1286 ret = add_qgroup_relation_item(trans, dst, src);
1287 if (ret) {
1288 del_qgroup_relation_item(trans, src, dst);
1289 goto out;
1290 }
1291
1292 spin_lock(&fs_info->qgroup_lock);
1293 ret = add_relation_rb(fs_info, src, dst);
1294 if (ret < 0) {
1295 spin_unlock(&fs_info->qgroup_lock);
1296 goto out;
1297 }
1298 ret = quick_update_accounting(fs_info, tmp, src, dst, 1);
1299 spin_unlock(&fs_info->qgroup_lock);
1300 out:
1301 mutex_unlock(&fs_info->qgroup_ioctl_lock);
1302 ulist_free(tmp);
1303 return ret;
1304 }
1305
1306 static int __del_qgroup_relation(struct btrfs_trans_handle *trans, u64 src,
1307 u64 dst)
1308 {
1309 struct btrfs_fs_info *fs_info = trans->fs_info;
1310 struct btrfs_root *quota_root;
1311 struct btrfs_qgroup *parent;
1312 struct btrfs_qgroup *member;
1313 struct btrfs_qgroup_list *list;
1314 struct ulist *tmp;
1315 int ret = 0;
1316 int err;
1317
1318 tmp = ulist_alloc(GFP_KERNEL);
1319 if (!tmp)
1320 return -ENOMEM;
1321
1322 quota_root = fs_info->quota_root;
1323 if (!quota_root) {
1324 ret = -EINVAL;
1325 goto out;
1326 }
1327
1328 member = find_qgroup_rb(fs_info, src);
1329 parent = find_qgroup_rb(fs_info, dst);
1330 if (!member || !parent) {
1331 ret = -EINVAL;
1332 goto out;
1333 }
1334
1335 /* check if such qgroup relation exist firstly */
1336 list_for_each_entry(list, &member->groups, next_group) {
1337 if (list->group == parent)
1338 goto exist;
1339 }
1340 ret = -ENOENT;
1341 goto out;
1342 exist:
1343 ret = del_qgroup_relation_item(trans, src, dst);
1344 err = del_qgroup_relation_item(trans, dst, src);
1345 if (err && !ret)
1346 ret = err;
1347
1348 spin_lock(&fs_info->qgroup_lock);
1349 del_relation_rb(fs_info, src, dst);
1350 ret = quick_update_accounting(fs_info, tmp, src, dst, -1);
1351 spin_unlock(&fs_info->qgroup_lock);
1352 out:
1353 ulist_free(tmp);
1354 return ret;
1355 }
1356
1357 int btrfs_del_qgroup_relation(struct btrfs_trans_handle *trans, u64 src,
1358 u64 dst)
1359 {
1360 struct btrfs_fs_info *fs_info = trans->fs_info;
1361 int ret = 0;
1362
1363 mutex_lock(&fs_info->qgroup_ioctl_lock);
1364 ret = __del_qgroup_relation(trans, src, dst);
1365 mutex_unlock(&fs_info->qgroup_ioctl_lock);
1366
1367 return ret;
1368 }
1369
1370 int btrfs_create_qgroup(struct btrfs_trans_handle *trans, u64 qgroupid)
1371 {
1372 struct btrfs_fs_info *fs_info = trans->fs_info;
1373 struct btrfs_root *quota_root;
1374 struct btrfs_qgroup *qgroup;
1375 int ret = 0;
1376
1377 mutex_lock(&fs_info->qgroup_ioctl_lock);
1378 quota_root = fs_info->quota_root;
1379 if (!quota_root) {
1380 ret = -EINVAL;
1381 goto out;
1382 }
1383 qgroup = find_qgroup_rb(fs_info, qgroupid);
1384 if (qgroup) {
1385 ret = -EEXIST;
1386 goto out;
1387 }
1388
1389 ret = add_qgroup_item(trans, quota_root, qgroupid);
1390 if (ret)
1391 goto out;
1392
1393 spin_lock(&fs_info->qgroup_lock);
1394 qgroup = add_qgroup_rb(fs_info, qgroupid);
1395 spin_unlock(&fs_info->qgroup_lock);
1396
1397 if (IS_ERR(qgroup))
1398 ret = PTR_ERR(qgroup);
1399 out:
1400 mutex_unlock(&fs_info->qgroup_ioctl_lock);
1401 return ret;
1402 }
1403
1404 int btrfs_remove_qgroup(struct btrfs_trans_handle *trans, u64 qgroupid)
1405 {
1406 struct btrfs_fs_info *fs_info = trans->fs_info;
1407 struct btrfs_root *quota_root;
1408 struct btrfs_qgroup *qgroup;
1409 struct btrfs_qgroup_list *list;
1410 int ret = 0;
1411
1412 mutex_lock(&fs_info->qgroup_ioctl_lock);
1413 quota_root = fs_info->quota_root;
1414 if (!quota_root) {
1415 ret = -EINVAL;
1416 goto out;
1417 }
1418
1419 qgroup = find_qgroup_rb(fs_info, qgroupid);
1420 if (!qgroup) {
1421 ret = -ENOENT;
1422 goto out;
1423 }
1424
1425 /* Check if there are no children of this qgroup */
1426 if (!list_empty(&qgroup->members)) {
1427 ret = -EBUSY;
1428 goto out;
1429 }
1430
1431 ret = del_qgroup_item(trans, qgroupid);
1432 if (ret && ret != -ENOENT)
1433 goto out;
1434
1435 while (!list_empty(&qgroup->groups)) {
1436 list = list_first_entry(&qgroup->groups,
1437 struct btrfs_qgroup_list, next_group);
1438 ret = __del_qgroup_relation(trans, qgroupid,
1439 list->group->qgroupid);
1440 if (ret)
1441 goto out;
1442 }
1443
1444 spin_lock(&fs_info->qgroup_lock);
1445 del_qgroup_rb(fs_info, qgroupid);
1446 spin_unlock(&fs_info->qgroup_lock);
1447 out:
1448 mutex_unlock(&fs_info->qgroup_ioctl_lock);
1449 return ret;
1450 }
1451
1452 int btrfs_limit_qgroup(struct btrfs_trans_handle *trans, u64 qgroupid,
1453 struct btrfs_qgroup_limit *limit)
1454 {
1455 struct btrfs_fs_info *fs_info = trans->fs_info;
1456 struct btrfs_root *quota_root;
1457 struct btrfs_qgroup *qgroup;
1458 int ret = 0;
1459 /* Sometimes we would want to clear the limit on this qgroup.
1460 * To meet this requirement, we treat the -1 as a special value
1461 * which tell kernel to clear the limit on this qgroup.
1462 */
1463 const u64 CLEAR_VALUE = -1;
1464
1465 mutex_lock(&fs_info->qgroup_ioctl_lock);
1466 quota_root = fs_info->quota_root;
1467 if (!quota_root) {
1468 ret = -EINVAL;
1469 goto out;
1470 }
1471
1472 qgroup = find_qgroup_rb(fs_info, qgroupid);
1473 if (!qgroup) {
1474 ret = -ENOENT;
1475 goto out;
1476 }
1477
1478 spin_lock(&fs_info->qgroup_lock);
1479 if (limit->flags & BTRFS_QGROUP_LIMIT_MAX_RFER) {
1480 if (limit->max_rfer == CLEAR_VALUE) {
1481 qgroup->lim_flags &= ~BTRFS_QGROUP_LIMIT_MAX_RFER;
1482 limit->flags &= ~BTRFS_QGROUP_LIMIT_MAX_RFER;
1483 qgroup->max_rfer = 0;
1484 } else {
1485 qgroup->max_rfer = limit->max_rfer;
1486 }
1487 }
1488 if (limit->flags & BTRFS_QGROUP_LIMIT_MAX_EXCL) {
1489 if (limit->max_excl == CLEAR_VALUE) {
1490 qgroup->lim_flags &= ~BTRFS_QGROUP_LIMIT_MAX_EXCL;
1491 limit->flags &= ~BTRFS_QGROUP_LIMIT_MAX_EXCL;
1492 qgroup->max_excl = 0;
1493 } else {
1494 qgroup->max_excl = limit->max_excl;
1495 }
1496 }
1497 if (limit->flags & BTRFS_QGROUP_LIMIT_RSV_RFER) {
1498 if (limit->rsv_rfer == CLEAR_VALUE) {
1499 qgroup->lim_flags &= ~BTRFS_QGROUP_LIMIT_RSV_RFER;
1500 limit->flags &= ~BTRFS_QGROUP_LIMIT_RSV_RFER;
1501 qgroup->rsv_rfer = 0;
1502 } else {
1503 qgroup->rsv_rfer = limit->rsv_rfer;
1504 }
1505 }
1506 if (limit->flags & BTRFS_QGROUP_LIMIT_RSV_EXCL) {
1507 if (limit->rsv_excl == CLEAR_VALUE) {
1508 qgroup->lim_flags &= ~BTRFS_QGROUP_LIMIT_RSV_EXCL;
1509 limit->flags &= ~BTRFS_QGROUP_LIMIT_RSV_EXCL;
1510 qgroup->rsv_excl = 0;
1511 } else {
1512 qgroup->rsv_excl = limit->rsv_excl;
1513 }
1514 }
1515 qgroup->lim_flags |= limit->flags;
1516
1517 spin_unlock(&fs_info->qgroup_lock);
1518
1519 ret = update_qgroup_limit_item(trans, qgroup);
1520 if (ret) {
1521 fs_info->qgroup_flags |= BTRFS_QGROUP_STATUS_FLAG_INCONSISTENT;
1522 btrfs_info(fs_info, "unable to update quota limit for %llu",
1523 qgroupid);
1524 }
1525
1526 out:
1527 mutex_unlock(&fs_info->qgroup_ioctl_lock);
1528 return ret;
1529 }
1530
1531 int btrfs_qgroup_trace_extent_nolock(struct btrfs_fs_info *fs_info,
1532 struct btrfs_delayed_ref_root *delayed_refs,
1533 struct btrfs_qgroup_extent_record *record)
1534 {
1535 struct rb_node **p = &delayed_refs->dirty_extent_root.rb_node;
1536 struct rb_node *parent_node = NULL;
1537 struct btrfs_qgroup_extent_record *entry;
1538 u64 bytenr = record->bytenr;
1539
1540 lockdep_assert_held(&delayed_refs->lock);
1541 trace_btrfs_qgroup_trace_extent(fs_info, record);
1542
1543 while (*p) {
1544 parent_node = *p;
1545 entry = rb_entry(parent_node, struct btrfs_qgroup_extent_record,
1546 node);
1547 if (bytenr < entry->bytenr) {
1548 p = &(*p)->rb_left;
1549 } else if (bytenr > entry->bytenr) {
1550 p = &(*p)->rb_right;
1551 } else {
1552 if (record->data_rsv && !entry->data_rsv) {
1553 entry->data_rsv = record->data_rsv;
1554 entry->data_rsv_refroot =
1555 record->data_rsv_refroot;
1556 }
1557 return 1;
1558 }
1559 }
1560
1561 rb_link_node(&record->node, parent_node, p);
1562 rb_insert_color(&record->node, &delayed_refs->dirty_extent_root);
1563 return 0;
1564 }
1565
1566 int btrfs_qgroup_trace_extent_post(struct btrfs_fs_info *fs_info,
1567 struct btrfs_qgroup_extent_record *qrecord)
1568 {
1569 struct ulist *old_root;
1570 u64 bytenr = qrecord->bytenr;
1571 int ret;
1572
1573 ret = btrfs_find_all_roots(NULL, fs_info, bytenr, 0, &old_root, false);
1574 if (ret < 0) {
1575 fs_info->qgroup_flags |= BTRFS_QGROUP_STATUS_FLAG_INCONSISTENT;
1576 btrfs_warn(fs_info,
1577 "error accounting new delayed refs extent (err code: %d), quota inconsistent",
1578 ret);
1579 return 0;
1580 }
1581
1582 /*
1583 * Here we don't need to get the lock of
1584 * trans->transaction->delayed_refs, since inserted qrecord won't
1585 * be deleted, only qrecord->node may be modified (new qrecord insert)
1586 *
1587 * So modifying qrecord->old_roots is safe here
1588 */
1589 qrecord->old_roots = old_root;
1590 return 0;
1591 }
1592
1593 int btrfs_qgroup_trace_extent(struct btrfs_trans_handle *trans, u64 bytenr,
1594 u64 num_bytes, gfp_t gfp_flag)
1595 {
1596 struct btrfs_fs_info *fs_info = trans->fs_info;
1597 struct btrfs_qgroup_extent_record *record;
1598 struct btrfs_delayed_ref_root *delayed_refs;
1599 int ret;
1600
1601 if (!test_bit(BTRFS_FS_QUOTA_ENABLED, &fs_info->flags)
1602 || bytenr == 0 || num_bytes == 0)
1603 return 0;
1604 record = kzalloc(sizeof(*record), gfp_flag);
1605 if (!record)
1606 return -ENOMEM;
1607
1608 delayed_refs = &trans->transaction->delayed_refs;
1609 record->bytenr = bytenr;
1610 record->num_bytes = num_bytes;
1611 record->old_roots = NULL;
1612
1613 spin_lock(&delayed_refs->lock);
1614 ret = btrfs_qgroup_trace_extent_nolock(fs_info, delayed_refs, record);
1615 spin_unlock(&delayed_refs->lock);
1616 if (ret > 0) {
1617 kfree(record);
1618 return 0;
1619 }
1620 return btrfs_qgroup_trace_extent_post(fs_info, record);
1621 }
1622
1623 int btrfs_qgroup_trace_leaf_items(struct btrfs_trans_handle *trans,
1624 struct extent_buffer *eb)
1625 {
1626 struct btrfs_fs_info *fs_info = trans->fs_info;
1627 int nr = btrfs_header_nritems(eb);
1628 int i, extent_type, ret;
1629 struct btrfs_key key;
1630 struct btrfs_file_extent_item *fi;
1631 u64 bytenr, num_bytes;
1632
1633 /* We can be called directly from walk_up_proc() */
1634 if (!test_bit(BTRFS_FS_QUOTA_ENABLED, &fs_info->flags))
1635 return 0;
1636
1637 for (i = 0; i < nr; i++) {
1638 btrfs_item_key_to_cpu(eb, &key, i);
1639
1640 if (key.type != BTRFS_EXTENT_DATA_KEY)
1641 continue;
1642
1643 fi = btrfs_item_ptr(eb, i, struct btrfs_file_extent_item);
1644 /* filter out non qgroup-accountable extents */
1645 extent_type = btrfs_file_extent_type(eb, fi);
1646
1647 if (extent_type == BTRFS_FILE_EXTENT_INLINE)
1648 continue;
1649
1650 bytenr = btrfs_file_extent_disk_bytenr(eb, fi);
1651 if (!bytenr)
1652 continue;
1653
1654 num_bytes = btrfs_file_extent_disk_num_bytes(eb, fi);
1655
1656 ret = btrfs_qgroup_trace_extent(trans, bytenr, num_bytes,
1657 GFP_NOFS);
1658 if (ret)
1659 return ret;
1660 }
1661 cond_resched();
1662 return 0;
1663 }
1664
1665 /*
1666 * Walk up the tree from the bottom, freeing leaves and any interior
1667 * nodes which have had all slots visited. If a node (leaf or
1668 * interior) is freed, the node above it will have it's slot
1669 * incremented. The root node will never be freed.
1670 *
1671 * At the end of this function, we should have a path which has all
1672 * slots incremented to the next position for a search. If we need to
1673 * read a new node it will be NULL and the node above it will have the
1674 * correct slot selected for a later read.
1675 *
1676 * If we increment the root nodes slot counter past the number of
1677 * elements, 1 is returned to signal completion of the search.
1678 */
1679 static int adjust_slots_upwards(struct btrfs_path *path, int root_level)
1680 {
1681 int level = 0;
1682 int nr, slot;
1683 struct extent_buffer *eb;
1684
1685 if (root_level == 0)
1686 return 1;
1687
1688 while (level <= root_level) {
1689 eb = path->nodes[level];
1690 nr = btrfs_header_nritems(eb);
1691 path->slots[level]++;
1692 slot = path->slots[level];
1693 if (slot >= nr || level == 0) {
1694 /*
1695 * Don't free the root - we will detect this
1696 * condition after our loop and return a
1697 * positive value for caller to stop walking the tree.
1698 */
1699 if (level != root_level) {
1700 btrfs_tree_unlock_rw(eb, path->locks[level]);
1701 path->locks[level] = 0;
1702
1703 free_extent_buffer(eb);
1704 path->nodes[level] = NULL;
1705 path->slots[level] = 0;
1706 }
1707 } else {
1708 /*
1709 * We have a valid slot to walk back down
1710 * from. Stop here so caller can process these
1711 * new nodes.
1712 */
1713 break;
1714 }
1715
1716 level++;
1717 }
1718
1719 eb = path->nodes[root_level];
1720 if (path->slots[root_level] >= btrfs_header_nritems(eb))
1721 return 1;
1722
1723 return 0;
1724 }
1725
1726 /*
1727 * Helper function to trace a subtree tree block swap.
1728 *
1729 * The swap will happen in highest tree block, but there may be a lot of
1730 * tree blocks involved.
1731 *
1732 * For example:
1733 * OO = Old tree blocks
1734 * NN = New tree blocks allocated during balance
1735 *
1736 * File tree (257) Reloc tree for 257
1737 * L2 OO NN
1738 * / \ / \
1739 * L1 OO OO (a) OO NN (a)
1740 * / \ / \ / \ / \
1741 * L0 OO OO OO OO OO OO NN NN
1742 * (b) (c) (b) (c)
1743 *
1744 * When calling qgroup_trace_extent_swap(), we will pass:
1745 * @src_eb = OO(a)
1746 * @dst_path = [ nodes[1] = NN(a), nodes[0] = NN(c) ]
1747 * @dst_level = 0
1748 * @root_level = 1
1749 *
1750 * In that case, qgroup_trace_extent_swap() will search from OO(a) to
1751 * reach OO(c), then mark both OO(c) and NN(c) as qgroup dirty.
1752 *
1753 * The main work of qgroup_trace_extent_swap() can be split into 3 parts:
1754 *
1755 * 1) Tree search from @src_eb
1756 * It should acts as a simplified btrfs_search_slot().
1757 * The key for search can be extracted from @dst_path->nodes[dst_level]
1758 * (first key).
1759 *
1760 * 2) Mark the final tree blocks in @src_path and @dst_path qgroup dirty
1761 * NOTE: In above case, OO(a) and NN(a) won't be marked qgroup dirty.
1762 * They should be marked during previous (@dst_level = 1) iteration.
1763 *
1764 * 3) Mark file extents in leaves dirty
1765 * We don't have good way to pick out new file extents only.
1766 * So we still follow the old method by scanning all file extents in
1767 * the leave.
1768 *
1769 * This function can free us from keeping two paths, thus later we only need
1770 * to care about how to iterate all new tree blocks in reloc tree.
1771 */
1772 static int qgroup_trace_extent_swap(struct btrfs_trans_handle* trans,
1773 struct extent_buffer *src_eb,
1774 struct btrfs_path *dst_path,
1775 int dst_level, int root_level,
1776 bool trace_leaf)
1777 {
1778 struct btrfs_key key;
1779 struct btrfs_path *src_path;
1780 struct btrfs_fs_info *fs_info = trans->fs_info;
1781 u32 nodesize = fs_info->nodesize;
1782 int cur_level = root_level;
1783 int ret;
1784
1785 BUG_ON(dst_level > root_level);
1786 /* Level mismatch */
1787 if (btrfs_header_level(src_eb) != root_level)
1788 return -EINVAL;
1789
1790 src_path = btrfs_alloc_path();
1791 if (!src_path) {
1792 ret = -ENOMEM;
1793 goto out;
1794 }
1795
1796 if (dst_level)
1797 btrfs_node_key_to_cpu(dst_path->nodes[dst_level], &key, 0);
1798 else
1799 btrfs_item_key_to_cpu(dst_path->nodes[dst_level], &key, 0);
1800
1801 /* For src_path */
1802 extent_buffer_get(src_eb);
1803 src_path->nodes[root_level] = src_eb;
1804 src_path->slots[root_level] = dst_path->slots[root_level];
1805 src_path->locks[root_level] = 0;
1806
1807 /* A simplified version of btrfs_search_slot() */
1808 while (cur_level >= dst_level) {
1809 struct btrfs_key src_key;
1810 struct btrfs_key dst_key;
1811
1812 if (src_path->nodes[cur_level] == NULL) {
1813 struct btrfs_key first_key;
1814 struct extent_buffer *eb;
1815 int parent_slot;
1816 u64 child_gen;
1817 u64 child_bytenr;
1818
1819 eb = src_path->nodes[cur_level + 1];
1820 parent_slot = src_path->slots[cur_level + 1];
1821 child_bytenr = btrfs_node_blockptr(eb, parent_slot);
1822 child_gen = btrfs_node_ptr_generation(eb, parent_slot);
1823 btrfs_node_key_to_cpu(eb, &first_key, parent_slot);
1824
1825 eb = read_tree_block(fs_info, child_bytenr, child_gen,
1826 cur_level, &first_key);
1827 if (IS_ERR(eb)) {
1828 ret = PTR_ERR(eb);
1829 goto out;
1830 } else if (!extent_buffer_uptodate(eb)) {
1831 free_extent_buffer(eb);
1832 ret = -EIO;
1833 goto out;
1834 }
1835
1836 src_path->nodes[cur_level] = eb;
1837
1838 btrfs_tree_read_lock(eb);
1839 btrfs_set_lock_blocking_read(eb);
1840 src_path->locks[cur_level] = BTRFS_READ_LOCK_BLOCKING;
1841 }
1842
1843 src_path->slots[cur_level] = dst_path->slots[cur_level];
1844 if (cur_level) {
1845 btrfs_node_key_to_cpu(dst_path->nodes[cur_level],
1846 &dst_key, dst_path->slots[cur_level]);
1847 btrfs_node_key_to_cpu(src_path->nodes[cur_level],
1848 &src_key, src_path->slots[cur_level]);
1849 } else {
1850 btrfs_item_key_to_cpu(dst_path->nodes[cur_level],
1851 &dst_key, dst_path->slots[cur_level]);
1852 btrfs_item_key_to_cpu(src_path->nodes[cur_level],
1853 &src_key, src_path->slots[cur_level]);
1854 }
1855 /* Content mismatch, something went wrong */
1856 if (btrfs_comp_cpu_keys(&dst_key, &src_key)) {
1857 ret = -ENOENT;
1858 goto out;
1859 }
1860 cur_level--;
1861 }
1862
1863 /*
1864 * Now both @dst_path and @src_path have been populated, record the tree
1865 * blocks for qgroup accounting.
1866 */
1867 ret = btrfs_qgroup_trace_extent(trans, src_path->nodes[dst_level]->start,
1868 nodesize, GFP_NOFS);
1869 if (ret < 0)
1870 goto out;
1871 ret = btrfs_qgroup_trace_extent(trans,
1872 dst_path->nodes[dst_level]->start,
1873 nodesize, GFP_NOFS);
1874 if (ret < 0)
1875 goto out;
1876
1877 /* Record leaf file extents */
1878 if (dst_level == 0 && trace_leaf) {
1879 ret = btrfs_qgroup_trace_leaf_items(trans, src_path->nodes[0]);
1880 if (ret < 0)
1881 goto out;
1882 ret = btrfs_qgroup_trace_leaf_items(trans, dst_path->nodes[0]);
1883 }
1884 out:
1885 btrfs_free_path(src_path);
1886 return ret;
1887 }
1888
1889 /*
1890 * Helper function to do recursive generation-aware depth-first search, to
1891 * locate all new tree blocks in a subtree of reloc tree.
1892 *
1893 * E.g. (OO = Old tree blocks, NN = New tree blocks, whose gen == last_snapshot)
1894 * reloc tree
1895 * L2 NN (a)
1896 * / \
1897 * L1 OO NN (b)
1898 * / \ / \
1899 * L0 OO OO OO NN
1900 * (c) (d)
1901 * If we pass:
1902 * @dst_path = [ nodes[1] = NN(b), nodes[0] = NULL ],
1903 * @cur_level = 1
1904 * @root_level = 1
1905 *
1906 * We will iterate through tree blocks NN(b), NN(d) and info qgroup to trace
1907 * above tree blocks along with their counter parts in file tree.
1908 * While during search, old tree blocks OO(c) will be skipped as tree block swap
1909 * won't affect OO(c).
1910 */
1911 static int qgroup_trace_new_subtree_blocks(struct btrfs_trans_handle* trans,
1912 struct extent_buffer *src_eb,
1913 struct btrfs_path *dst_path,
1914 int cur_level, int root_level,
1915 u64 last_snapshot, bool trace_leaf)
1916 {
1917 struct btrfs_fs_info *fs_info = trans->fs_info;
1918 struct extent_buffer *eb;
1919 bool need_cleanup = false;
1920 int ret = 0;
1921 int i;
1922
1923 /* Level sanity check */
1924 if (cur_level < 0 || cur_level >= BTRFS_MAX_LEVEL - 1 ||
1925 root_level < 0 || root_level >= BTRFS_MAX_LEVEL - 1 ||
1926 root_level < cur_level) {
1927 btrfs_err_rl(fs_info,
1928 "%s: bad levels, cur_level=%d root_level=%d",
1929 __func__, cur_level, root_level);
1930 return -EUCLEAN;
1931 }
1932
1933 /* Read the tree block if needed */
1934 if (dst_path->nodes[cur_level] == NULL) {
1935 struct btrfs_key first_key;
1936 int parent_slot;
1937 u64 child_gen;
1938 u64 child_bytenr;
1939
1940 /*
1941 * dst_path->nodes[root_level] must be initialized before
1942 * calling this function.
1943 */
1944 if (cur_level == root_level) {
1945 btrfs_err_rl(fs_info,
1946 "%s: dst_path->nodes[%d] not initialized, root_level=%d cur_level=%d",
1947 __func__, root_level, root_level, cur_level);
1948 return -EUCLEAN;
1949 }
1950
1951 /*
1952 * We need to get child blockptr/gen from parent before we can
1953 * read it.
1954 */
1955 eb = dst_path->nodes[cur_level + 1];
1956 parent_slot = dst_path->slots[cur_level + 1];
1957 child_bytenr = btrfs_node_blockptr(eb, parent_slot);
1958 child_gen = btrfs_node_ptr_generation(eb, parent_slot);
1959 btrfs_node_key_to_cpu(eb, &first_key, parent_slot);
1960
1961 /* This node is old, no need to trace */
1962 if (child_gen < last_snapshot)
1963 goto out;
1964
1965 eb = read_tree_block(fs_info, child_bytenr, child_gen,
1966 cur_level, &first_key);
1967 if (IS_ERR(eb)) {
1968 ret = PTR_ERR(eb);
1969 goto out;
1970 } else if (!extent_buffer_uptodate(eb)) {
1971 free_extent_buffer(eb);
1972 ret = -EIO;
1973 goto out;
1974 }
1975
1976 dst_path->nodes[cur_level] = eb;
1977 dst_path->slots[cur_level] = 0;
1978
1979 btrfs_tree_read_lock(eb);
1980 btrfs_set_lock_blocking_read(eb);
1981 dst_path->locks[cur_level] = BTRFS_READ_LOCK_BLOCKING;
1982 need_cleanup = true;
1983 }
1984
1985 /* Now record this tree block and its counter part for qgroups */
1986 ret = qgroup_trace_extent_swap(trans, src_eb, dst_path, cur_level,
1987 root_level, trace_leaf);
1988 if (ret < 0)
1989 goto cleanup;
1990
1991 eb = dst_path->nodes[cur_level];
1992
1993 if (cur_level > 0) {
1994 /* Iterate all child tree blocks */
1995 for (i = 0; i < btrfs_header_nritems(eb); i++) {
1996 /* Skip old tree blocks as they won't be swapped */
1997 if (btrfs_node_ptr_generation(eb, i) < last_snapshot)
1998 continue;
1999 dst_path->slots[cur_level] = i;
2000
2001 /* Recursive call (at most 7 times) */
2002 ret = qgroup_trace_new_subtree_blocks(trans, src_eb,
2003 dst_path, cur_level - 1, root_level,
2004 last_snapshot, trace_leaf);
2005 if (ret < 0)
2006 goto cleanup;
2007 }
2008 }
2009
2010 cleanup:
2011 if (need_cleanup) {
2012 /* Clean up */
2013 btrfs_tree_unlock_rw(dst_path->nodes[cur_level],
2014 dst_path->locks[cur_level]);
2015 free_extent_buffer(dst_path->nodes[cur_level]);
2016 dst_path->nodes[cur_level] = NULL;
2017 dst_path->slots[cur_level] = 0;
2018 dst_path->locks[cur_level] = 0;
2019 }
2020 out:
2021 return ret;
2022 }
2023
2024 static int qgroup_trace_subtree_swap(struct btrfs_trans_handle *trans,
2025 struct extent_buffer *src_eb,
2026 struct extent_buffer *dst_eb,
2027 u64 last_snapshot, bool trace_leaf)
2028 {
2029 struct btrfs_fs_info *fs_info = trans->fs_info;
2030 struct btrfs_path *dst_path = NULL;
2031 int level;
2032 int ret;
2033
2034 if (!test_bit(BTRFS_FS_QUOTA_ENABLED, &fs_info->flags))
2035 return 0;
2036
2037 /* Wrong parameter order */
2038 if (btrfs_header_generation(src_eb) > btrfs_header_generation(dst_eb)) {
2039 btrfs_err_rl(fs_info,
2040 "%s: bad parameter order, src_gen=%llu dst_gen=%llu", __func__,
2041 btrfs_header_generation(src_eb),
2042 btrfs_header_generation(dst_eb));
2043 return -EUCLEAN;
2044 }
2045
2046 if (!extent_buffer_uptodate(src_eb) || !extent_buffer_uptodate(dst_eb)) {
2047 ret = -EIO;
2048 goto out;
2049 }
2050
2051 level = btrfs_header_level(dst_eb);
2052 dst_path = btrfs_alloc_path();
2053 if (!dst_path) {
2054 ret = -ENOMEM;
2055 goto out;
2056 }
2057 /* For dst_path */
2058 extent_buffer_get(dst_eb);
2059 dst_path->nodes[level] = dst_eb;
2060 dst_path->slots[level] = 0;
2061 dst_path->locks[level] = 0;
2062
2063 /* Do the generation aware breadth-first search */
2064 ret = qgroup_trace_new_subtree_blocks(trans, src_eb, dst_path, level,
2065 level, last_snapshot, trace_leaf);
2066 if (ret < 0)
2067 goto out;
2068 ret = 0;
2069
2070 out:
2071 btrfs_free_path(dst_path);
2072 if (ret < 0)
2073 fs_info->qgroup_flags |= BTRFS_QGROUP_STATUS_FLAG_INCONSISTENT;
2074 return ret;
2075 }
2076
2077 int btrfs_qgroup_trace_subtree(struct btrfs_trans_handle *trans,
2078 struct extent_buffer *root_eb,
2079 u64 root_gen, int root_level)
2080 {
2081 struct btrfs_fs_info *fs_info = trans->fs_info;
2082 int ret = 0;
2083 int level;
2084 struct extent_buffer *eb = root_eb;
2085 struct btrfs_path *path = NULL;
2086
2087 BUG_ON(root_level < 0 || root_level >= BTRFS_MAX_LEVEL);
2088 BUG_ON(root_eb == NULL);
2089
2090 if (!test_bit(BTRFS_FS_QUOTA_ENABLED, &fs_info->flags))
2091 return 0;
2092
2093 if (!extent_buffer_uptodate(root_eb)) {
2094 ret = btrfs_read_buffer(root_eb, root_gen, root_level, NULL);
2095 if (ret)
2096 goto out;
2097 }
2098
2099 if (root_level == 0) {
2100 ret = btrfs_qgroup_trace_leaf_items(trans, root_eb);
2101 goto out;
2102 }
2103
2104 path = btrfs_alloc_path();
2105 if (!path)
2106 return -ENOMEM;
2107
2108 /*
2109 * Walk down the tree. Missing extent blocks are filled in as
2110 * we go. Metadata is accounted every time we read a new
2111 * extent block.
2112 *
2113 * When we reach a leaf, we account for file extent items in it,
2114 * walk back up the tree (adjusting slot pointers as we go)
2115 * and restart the search process.
2116 */
2117 extent_buffer_get(root_eb); /* For path */
2118 path->nodes[root_level] = root_eb;
2119 path->slots[root_level] = 0;
2120 path->locks[root_level] = 0; /* so release_path doesn't try to unlock */
2121 walk_down:
2122 level = root_level;
2123 while (level >= 0) {
2124 if (path->nodes[level] == NULL) {
2125 struct btrfs_key first_key;
2126 int parent_slot;
2127 u64 child_gen;
2128 u64 child_bytenr;
2129
2130 /*
2131 * We need to get child blockptr/gen from parent before
2132 * we can read it.
2133 */
2134 eb = path->nodes[level + 1];
2135 parent_slot = path->slots[level + 1];
2136 child_bytenr = btrfs_node_blockptr(eb, parent_slot);
2137 child_gen = btrfs_node_ptr_generation(eb, parent_slot);
2138 btrfs_node_key_to_cpu(eb, &first_key, parent_slot);
2139
2140 eb = read_tree_block(fs_info, child_bytenr, child_gen,
2141 level, &first_key);
2142 if (IS_ERR(eb)) {
2143 ret = PTR_ERR(eb);
2144 goto out;
2145 } else if (!extent_buffer_uptodate(eb)) {
2146 free_extent_buffer(eb);
2147 ret = -EIO;
2148 goto out;
2149 }
2150
2151 path->nodes[level] = eb;
2152 path->slots[level] = 0;
2153
2154 btrfs_tree_read_lock(eb);
2155 btrfs_set_lock_blocking_read(eb);
2156 path->locks[level] = BTRFS_READ_LOCK_BLOCKING;
2157
2158 ret = btrfs_qgroup_trace_extent(trans, child_bytenr,
2159 fs_info->nodesize,
2160 GFP_NOFS);
2161 if (ret)
2162 goto out;
2163 }
2164
2165 if (level == 0) {
2166 ret = btrfs_qgroup_trace_leaf_items(trans,
2167 path->nodes[level]);
2168 if (ret)
2169 goto out;
2170
2171 /* Nonzero return here means we completed our search */
2172 ret = adjust_slots_upwards(path, root_level);
2173 if (ret)
2174 break;
2175
2176 /* Restart search with new slots */
2177 goto walk_down;
2178 }
2179
2180 level--;
2181 }
2182
2183 ret = 0;
2184 out:
2185 btrfs_free_path(path);
2186
2187 return ret;
2188 }
2189
2190 #define UPDATE_NEW 0
2191 #define UPDATE_OLD 1
2192 /*
2193 * Walk all of the roots that points to the bytenr and adjust their refcnts.
2194 */
2195 static int qgroup_update_refcnt(struct btrfs_fs_info *fs_info,
2196 struct ulist *roots, struct ulist *tmp,
2197 struct ulist *qgroups, u64 seq, int update_old)
2198 {
2199 struct ulist_node *unode;
2200 struct ulist_iterator uiter;
2201 struct ulist_node *tmp_unode;
2202 struct ulist_iterator tmp_uiter;
2203 struct btrfs_qgroup *qg;
2204 int ret = 0;
2205
2206 if (!roots)
2207 return 0;
2208 ULIST_ITER_INIT(&uiter);
2209 while ((unode = ulist_next(roots, &uiter))) {
2210 qg = find_qgroup_rb(fs_info, unode->val);
2211 if (!qg)
2212 continue;
2213
2214 ulist_reinit(tmp);
2215 ret = ulist_add(qgroups, qg->qgroupid, qgroup_to_aux(qg),
2216 GFP_ATOMIC);
2217 if (ret < 0)
2218 return ret;
2219 ret = ulist_add(tmp, qg->qgroupid, qgroup_to_aux(qg), GFP_ATOMIC);
2220 if (ret < 0)
2221 return ret;
2222 ULIST_ITER_INIT(&tmp_uiter);
2223 while ((tmp_unode = ulist_next(tmp, &tmp_uiter))) {
2224 struct btrfs_qgroup_list *glist;
2225
2226 qg = unode_aux_to_qgroup(tmp_unode);
2227 if (update_old)
2228 btrfs_qgroup_update_old_refcnt(qg, seq, 1);
2229 else
2230 btrfs_qgroup_update_new_refcnt(qg, seq, 1);
2231 list_for_each_entry(glist, &qg->groups, next_group) {
2232 ret = ulist_add(qgroups, glist->group->qgroupid,
2233 qgroup_to_aux(glist->group),
2234 GFP_ATOMIC);
2235 if (ret < 0)
2236 return ret;
2237 ret = ulist_add(tmp, glist->group->qgroupid,
2238 qgroup_to_aux(glist->group),
2239 GFP_ATOMIC);
2240 if (ret < 0)
2241 return ret;
2242 }
2243 }
2244 }
2245 return 0;
2246 }
2247
2248 /*
2249 * Update qgroup rfer/excl counters.
2250 * Rfer update is easy, codes can explain themselves.
2251 *
2252 * Excl update is tricky, the update is split into 2 part.
2253 * Part 1: Possible exclusive <-> sharing detect:
2254 * | A | !A |
2255 * -------------------------------------
2256 * B | * | - |
2257 * -------------------------------------
2258 * !B | + | ** |
2259 * -------------------------------------
2260 *
2261 * Conditions:
2262 * A: cur_old_roots < nr_old_roots (not exclusive before)
2263 * !A: cur_old_roots == nr_old_roots (possible exclusive before)
2264 * B: cur_new_roots < nr_new_roots (not exclusive now)
2265 * !B: cur_new_roots == nr_new_roots (possible exclusive now)
2266 *
2267 * Results:
2268 * +: Possible sharing -> exclusive -: Possible exclusive -> sharing
2269 * *: Definitely not changed. **: Possible unchanged.
2270 *
2271 * For !A and !B condition, the exception is cur_old/new_roots == 0 case.
2272 *
2273 * To make the logic clear, we first use condition A and B to split
2274 * combination into 4 results.
2275 *
2276 * Then, for result "+" and "-", check old/new_roots == 0 case, as in them
2277 * only on variant maybe 0.
2278 *
2279 * Lastly, check result **, since there are 2 variants maybe 0, split them
2280 * again(2x2).
2281 * But this time we don't need to consider other things, the codes and logic
2282 * is easy to understand now.
2283 */
2284 static int qgroup_update_counters(struct btrfs_fs_info *fs_info,
2285 struct ulist *qgroups,
2286 u64 nr_old_roots,
2287 u64 nr_new_roots,
2288 u64 num_bytes, u64 seq)
2289 {
2290 struct ulist_node *unode;
2291 struct ulist_iterator uiter;
2292 struct btrfs_qgroup *qg;
2293 u64 cur_new_count, cur_old_count;
2294
2295 ULIST_ITER_INIT(&uiter);
2296 while ((unode = ulist_next(qgroups, &uiter))) {
2297 bool dirty = false;
2298
2299 qg = unode_aux_to_qgroup(unode);
2300 cur_old_count = btrfs_qgroup_get_old_refcnt(qg, seq);
2301 cur_new_count = btrfs_qgroup_get_new_refcnt(qg, seq);
2302
2303 trace_qgroup_update_counters(fs_info, qg, cur_old_count,
2304 cur_new_count);
2305
2306 /* Rfer update part */
2307 if (cur_old_count == 0 && cur_new_count > 0) {
2308 qg->rfer += num_bytes;
2309 qg->rfer_cmpr += num_bytes;
2310 dirty = true;
2311 }
2312 if (cur_old_count > 0 && cur_new_count == 0) {
2313 qg->rfer -= num_bytes;
2314 qg->rfer_cmpr -= num_bytes;
2315 dirty = true;
2316 }
2317
2318 /* Excl update part */
2319 /* Exclusive/none -> shared case */
2320 if (cur_old_count == nr_old_roots &&
2321 cur_new_count < nr_new_roots) {
2322 /* Exclusive -> shared */
2323 if (cur_old_count != 0) {
2324 qg->excl -= num_bytes;
2325 qg->excl_cmpr -= num_bytes;
2326 dirty = true;
2327 }
2328 }
2329
2330 /* Shared -> exclusive/none case */
2331 if (cur_old_count < nr_old_roots &&
2332 cur_new_count == nr_new_roots) {
2333 /* Shared->exclusive */
2334 if (cur_new_count != 0) {
2335 qg->excl += num_bytes;
2336 qg->excl_cmpr += num_bytes;
2337 dirty = true;
2338 }
2339 }
2340
2341 /* Exclusive/none -> exclusive/none case */
2342 if (cur_old_count == nr_old_roots &&
2343 cur_new_count == nr_new_roots) {
2344 if (cur_old_count == 0) {
2345 /* None -> exclusive/none */
2346
2347 if (cur_new_count != 0) {
2348 /* None -> exclusive */
2349 qg->excl += num_bytes;
2350 qg->excl_cmpr += num_bytes;
2351 dirty = true;
2352 }
2353 /* None -> none, nothing changed */
2354 } else {
2355 /* Exclusive -> exclusive/none */
2356
2357 if (cur_new_count == 0) {
2358 /* Exclusive -> none */
2359 qg->excl -= num_bytes;
2360 qg->excl_cmpr -= num_bytes;
2361 dirty = true;
2362 }
2363 /* Exclusive -> exclusive, nothing changed */
2364 }
2365 }
2366
2367 if (dirty)
2368 qgroup_dirty(fs_info, qg);
2369 }
2370 return 0;
2371 }
2372
2373 /*
2374 * Check if the @roots potentially is a list of fs tree roots
2375 *
2376 * Return 0 for definitely not a fs/subvol tree roots ulist
2377 * Return 1 for possible fs/subvol tree roots in the list (considering an empty
2378 * one as well)
2379 */
2380 static int maybe_fs_roots(struct ulist *roots)
2381 {
2382 struct ulist_node *unode;
2383 struct ulist_iterator uiter;
2384
2385 /* Empty one, still possible for fs roots */
2386 if (!roots || roots->nnodes == 0)
2387 return 1;
2388
2389 ULIST_ITER_INIT(&uiter);
2390 unode = ulist_next(roots, &uiter);
2391 if (!unode)
2392 return 1;
2393
2394 /*
2395 * If it contains fs tree roots, then it must belong to fs/subvol
2396 * trees.
2397 * If it contains a non-fs tree, it won't be shared with fs/subvol trees.
2398 */
2399 return is_fstree(unode->val);
2400 }
2401
2402 int btrfs_qgroup_account_extent(struct btrfs_trans_handle *trans, u64 bytenr,
2403 u64 num_bytes, struct ulist *old_roots,
2404 struct ulist *new_roots)
2405 {
2406 struct btrfs_fs_info *fs_info = trans->fs_info;
2407 struct ulist *qgroups = NULL;
2408 struct ulist *tmp = NULL;
2409 u64 seq;
2410 u64 nr_new_roots = 0;
2411 u64 nr_old_roots = 0;
2412 int ret = 0;
2413
2414 if (!test_bit(BTRFS_FS_QUOTA_ENABLED, &fs_info->flags))
2415 return 0;
2416
2417 if (new_roots) {
2418 if (!maybe_fs_roots(new_roots))
2419 goto out_free;
2420 nr_new_roots = new_roots->nnodes;
2421 }
2422 if (old_roots) {
2423 if (!maybe_fs_roots(old_roots))
2424 goto out_free;
2425 nr_old_roots = old_roots->nnodes;
2426 }
2427
2428 /* Quick exit, either not fs tree roots, or won't affect any qgroup */
2429 if (nr_old_roots == 0 && nr_new_roots == 0)
2430 goto out_free;
2431
2432 BUG_ON(!fs_info->quota_root);
2433
2434 trace_btrfs_qgroup_account_extent(fs_info, trans->transid, bytenr,
2435 num_bytes, nr_old_roots, nr_new_roots);
2436
2437 qgroups = ulist_alloc(GFP_NOFS);
2438 if (!qgroups) {
2439 ret = -ENOMEM;
2440 goto out_free;
2441 }
2442 tmp = ulist_alloc(GFP_NOFS);
2443 if (!tmp) {
2444 ret = -ENOMEM;
2445 goto out_free;
2446 }
2447
2448 mutex_lock(&fs_info->qgroup_rescan_lock);
2449 if (fs_info->qgroup_flags & BTRFS_QGROUP_STATUS_FLAG_RESCAN) {
2450 if (fs_info->qgroup_rescan_progress.objectid <= bytenr) {
2451 mutex_unlock(&fs_info->qgroup_rescan_lock);
2452 ret = 0;
2453 goto out_free;
2454 }
2455 }
2456 mutex_unlock(&fs_info->qgroup_rescan_lock);
2457
2458 spin_lock(&fs_info->qgroup_lock);
2459 seq = fs_info->qgroup_seq;
2460
2461 /* Update old refcnts using old_roots */
2462 ret = qgroup_update_refcnt(fs_info, old_roots, tmp, qgroups, seq,
2463 UPDATE_OLD);
2464 if (ret < 0)
2465 goto out;
2466
2467 /* Update new refcnts using new_roots */
2468 ret = qgroup_update_refcnt(fs_info, new_roots, tmp, qgroups, seq,
2469 UPDATE_NEW);
2470 if (ret < 0)
2471 goto out;
2472
2473 qgroup_update_counters(fs_info, qgroups, nr_old_roots, nr_new_roots,
2474 num_bytes, seq);
2475
2476 /*
2477 * Bump qgroup_seq to avoid seq overlap
2478 */
2479 fs_info->qgroup_seq += max(nr_old_roots, nr_new_roots) + 1;
2480 out:
2481 spin_unlock(&fs_info->qgroup_lock);
2482 out_free:
2483 ulist_free(tmp);
2484 ulist_free(qgroups);
2485 ulist_free(old_roots);
2486 ulist_free(new_roots);
2487 return ret;
2488 }
2489
2490 int btrfs_qgroup_account_extents(struct btrfs_trans_handle *trans)
2491 {
2492 struct btrfs_fs_info *fs_info = trans->fs_info;
2493 struct btrfs_qgroup_extent_record *record;
2494 struct btrfs_delayed_ref_root *delayed_refs;
2495 struct ulist *new_roots = NULL;
2496 struct rb_node *node;
2497 u64 num_dirty_extents = 0;
2498 u64 qgroup_to_skip;
2499 int ret = 0;
2500
2501 delayed_refs = &trans->transaction->delayed_refs;
2502 qgroup_to_skip = delayed_refs->qgroup_to_skip;
2503 while ((node = rb_first(&delayed_refs->dirty_extent_root))) {
2504 record = rb_entry(node, struct btrfs_qgroup_extent_record,
2505 node);
2506
2507 num_dirty_extents++;
2508 trace_btrfs_qgroup_account_extents(fs_info, record);
2509
2510 if (!ret) {
2511 /*
2512 * Old roots should be searched when inserting qgroup
2513 * extent record
2514 */
2515 if (WARN_ON(!record->old_roots)) {
2516 /* Search commit root to find old_roots */
2517 ret = btrfs_find_all_roots(NULL, fs_info,
2518 record->bytenr, 0,
2519 &record->old_roots, false);
2520 if (ret < 0)
2521 goto cleanup;
2522 }
2523
2524 /* Free the reserved data space */
2525 btrfs_qgroup_free_refroot(fs_info,
2526 record->data_rsv_refroot,
2527 record->data_rsv,
2528 BTRFS_QGROUP_RSV_DATA);
2529 /*
2530 * Use SEQ_LAST as time_seq to do special search, which
2531 * doesn't lock tree or delayed_refs and search current
2532 * root. It's safe inside commit_transaction().
2533 */
2534 ret = btrfs_find_all_roots(trans, fs_info,
2535 record->bytenr, SEQ_LAST, &new_roots, false);
2536 if (ret < 0)
2537 goto cleanup;
2538 if (qgroup_to_skip) {
2539 ulist_del(new_roots, qgroup_to_skip, 0);
2540 ulist_del(record->old_roots, qgroup_to_skip,
2541 0);
2542 }
2543 ret = btrfs_qgroup_account_extent(trans, record->bytenr,
2544 record->num_bytes,
2545 record->old_roots,
2546 new_roots);
2547 record->old_roots = NULL;
2548 new_roots = NULL;
2549 }
2550 cleanup:
2551 ulist_free(record->old_roots);
2552 ulist_free(new_roots);
2553 new_roots = NULL;
2554 rb_erase(node, &delayed_refs->dirty_extent_root);
2555 kfree(record);
2556
2557 }
2558 trace_qgroup_num_dirty_extents(fs_info, trans->transid,
2559 num_dirty_extents);
2560 return ret;
2561 }
2562
2563 /*
2564 * called from commit_transaction. Writes all changed qgroups to disk.
2565 */
2566 int btrfs_run_qgroups(struct btrfs_trans_handle *trans)
2567 {
2568 struct btrfs_fs_info *fs_info = trans->fs_info;
2569 struct btrfs_root *quota_root = fs_info->quota_root;
2570 int ret = 0;
2571
2572 if (!quota_root)
2573 return ret;
2574
2575 spin_lock(&fs_info->qgroup_lock);
2576 while (!list_empty(&fs_info->dirty_qgroups)) {
2577 struct btrfs_qgroup *qgroup;
2578 qgroup = list_first_entry(&fs_info->dirty_qgroups,
2579 struct btrfs_qgroup, dirty);
2580 list_del_init(&qgroup->dirty);
2581 spin_unlock(&fs_info->qgroup_lock);
2582 ret = update_qgroup_info_item(trans, qgroup);
2583 if (ret)
2584 fs_info->qgroup_flags |=
2585 BTRFS_QGROUP_STATUS_FLAG_INCONSISTENT;
2586 ret = update_qgroup_limit_item(trans, qgroup);
2587 if (ret)
2588 fs_info->qgroup_flags |=
2589 BTRFS_QGROUP_STATUS_FLAG_INCONSISTENT;
2590 spin_lock(&fs_info->qgroup_lock);
2591 }
2592 if (test_bit(BTRFS_FS_QUOTA_ENABLED, &fs_info->flags))
2593 fs_info->qgroup_flags |= BTRFS_QGROUP_STATUS_FLAG_ON;
2594 else
2595 fs_info->qgroup_flags &= ~BTRFS_QGROUP_STATUS_FLAG_ON;
2596 spin_unlock(&fs_info->qgroup_lock);
2597
2598 ret = update_qgroup_status_item(trans);
2599 if (ret)
2600 fs_info->qgroup_flags |= BTRFS_QGROUP_STATUS_FLAG_INCONSISTENT;
2601
2602 return ret;
2603 }
2604
2605 /*
2606 * Copy the accounting information between qgroups. This is necessary
2607 * when a snapshot or a subvolume is created. Throwing an error will
2608 * cause a transaction abort so we take extra care here to only error
2609 * when a readonly fs is a reasonable outcome.
2610 */
2611 int btrfs_qgroup_inherit(struct btrfs_trans_handle *trans, u64 srcid,
2612 u64 objectid, struct btrfs_qgroup_inherit *inherit)
2613 {
2614 int ret = 0;
2615 int i;
2616 u64 *i_qgroups;
2617 struct btrfs_fs_info *fs_info = trans->fs_info;
2618 struct btrfs_root *quota_root;
2619 struct btrfs_qgroup *srcgroup;
2620 struct btrfs_qgroup *dstgroup;
2621 u32 level_size = 0;
2622 u64 nums;
2623
2624 mutex_lock(&fs_info->qgroup_ioctl_lock);
2625 if (!test_bit(BTRFS_FS_QUOTA_ENABLED, &fs_info->flags))
2626 goto out;
2627
2628 quota_root = fs_info->quota_root;
2629 if (!quota_root) {
2630 ret = -EINVAL;
2631 goto out;
2632 }
2633
2634 if (inherit) {
2635 i_qgroups = (u64 *)(inherit + 1);
2636 nums = inherit->num_qgroups + 2 * inherit->num_ref_copies +
2637 2 * inherit->num_excl_copies;
2638 for (i = 0; i < nums; ++i) {
2639 srcgroup = find_qgroup_rb(fs_info, *i_qgroups);
2640
2641 /*
2642 * Zero out invalid groups so we can ignore
2643 * them later.
2644 */
2645 if (!srcgroup ||
2646 ((srcgroup->qgroupid >> 48) <= (objectid >> 48)))
2647 *i_qgroups = 0ULL;
2648
2649 ++i_qgroups;
2650 }
2651 }
2652
2653 /*
2654 * create a tracking group for the subvol itself
2655 */
2656 ret = add_qgroup_item(trans, quota_root, objectid);
2657 if (ret)
2658 goto out;
2659
2660 /*
2661 * add qgroup to all inherited groups
2662 */
2663 if (inherit) {
2664 i_qgroups = (u64 *)(inherit + 1);
2665 for (i = 0; i < inherit->num_qgroups; ++i, ++i_qgroups) {
2666 if (*i_qgroups == 0)
2667 continue;
2668 ret = add_qgroup_relation_item(trans, objectid,
2669 *i_qgroups);
2670 if (ret && ret != -EEXIST)
2671 goto out;
2672 ret = add_qgroup_relation_item(trans, *i_qgroups,
2673 objectid);
2674 if (ret && ret != -EEXIST)
2675 goto out;
2676 }
2677 ret = 0;
2678 }
2679
2680
2681 spin_lock(&fs_info->qgroup_lock);
2682
2683 dstgroup = add_qgroup_rb(fs_info, objectid);
2684 if (IS_ERR(dstgroup)) {
2685 ret = PTR_ERR(dstgroup);
2686 goto unlock;
2687 }
2688
2689 if (inherit && inherit->flags & BTRFS_QGROUP_INHERIT_SET_LIMITS) {
2690 dstgroup->lim_flags = inherit->lim.flags;
2691 dstgroup->max_rfer = inherit->lim.max_rfer;
2692 dstgroup->max_excl = inherit->lim.max_excl;
2693 dstgroup->rsv_rfer = inherit->lim.rsv_rfer;
2694 dstgroup->rsv_excl = inherit->lim.rsv_excl;
2695
2696 ret = update_qgroup_limit_item(trans, dstgroup);
2697 if (ret) {
2698 fs_info->qgroup_flags |= BTRFS_QGROUP_STATUS_FLAG_INCONSISTENT;
2699 btrfs_info(fs_info,
2700 "unable to update quota limit for %llu",
2701 dstgroup->qgroupid);
2702 goto unlock;
2703 }
2704 }
2705
2706 if (srcid) {
2707 srcgroup = find_qgroup_rb(fs_info, srcid);
2708 if (!srcgroup)
2709 goto unlock;
2710
2711 /*
2712 * We call inherit after we clone the root in order to make sure
2713 * our counts don't go crazy, so at this point the only
2714 * difference between the two roots should be the root node.
2715 */
2716 level_size = fs_info->nodesize;
2717 dstgroup->rfer = srcgroup->rfer;
2718 dstgroup->rfer_cmpr = srcgroup->rfer_cmpr;
2719 dstgroup->excl = level_size;
2720 dstgroup->excl_cmpr = level_size;
2721 srcgroup->excl = level_size;
2722 srcgroup->excl_cmpr = level_size;
2723
2724 /* inherit the limit info */
2725 dstgroup->lim_flags = srcgroup->lim_flags;
2726 dstgroup->max_rfer = srcgroup->max_rfer;
2727 dstgroup->max_excl = srcgroup->max_excl;
2728 dstgroup->rsv_rfer = srcgroup->rsv_rfer;
2729 dstgroup->rsv_excl = srcgroup->rsv_excl;
2730
2731 qgroup_dirty(fs_info, dstgroup);
2732 qgroup_dirty(fs_info, srcgroup);
2733 }
2734
2735 if (!inherit)
2736 goto unlock;
2737
2738 i_qgroups = (u64 *)(inherit + 1);
2739 for (i = 0; i < inherit->num_qgroups; ++i) {
2740 if (*i_qgroups) {
2741 ret = add_relation_rb(fs_info, objectid, *i_qgroups);
2742 if (ret)
2743 goto unlock;
2744 }
2745 ++i_qgroups;
2746 }
2747
2748 for (i = 0; i < inherit->num_ref_copies; ++i, i_qgroups += 2) {
2749 struct btrfs_qgroup *src;
2750 struct btrfs_qgroup *dst;
2751
2752 if (!i_qgroups[0] || !i_qgroups[1])
2753 continue;
2754
2755 src = find_qgroup_rb(fs_info, i_qgroups[0]);
2756 dst = find_qgroup_rb(fs_info, i_qgroups[1]);
2757
2758 if (!src || !dst) {
2759 ret = -EINVAL;
2760 goto unlock;
2761 }
2762
2763 dst->rfer = src->rfer - level_size;
2764 dst->rfer_cmpr = src->rfer_cmpr - level_size;
2765 }
2766 for (i = 0; i < inherit->num_excl_copies; ++i, i_qgroups += 2) {
2767 struct btrfs_qgroup *src;
2768 struct btrfs_qgroup *dst;
2769
2770 if (!i_qgroups[0] || !i_qgroups[1])
2771 continue;
2772
2773 src = find_qgroup_rb(fs_info, i_qgroups[0]);
2774 dst = find_qgroup_rb(fs_info, i_qgroups[1]);
2775
2776 if (!src || !dst) {
2777 ret = -EINVAL;
2778 goto unlock;
2779 }
2780
2781 dst->excl = src->excl + level_size;
2782 dst->excl_cmpr = src->excl_cmpr + level_size;
2783 }
2784
2785 unlock:
2786 spin_unlock(&fs_info->qgroup_lock);
2787 out:
2788 mutex_unlock(&fs_info->qgroup_ioctl_lock);
2789 return ret;
2790 }
2791
2792 /*
2793 * Two limits to commit transaction in advance.
2794 *
2795 * For RATIO, it will be 1/RATIO of the remaining limit as threshold.
2796 * For SIZE, it will be in byte unit as threshold.
2797 */
2798 #define QGROUP_FREE_RATIO 32
2799 #define QGROUP_FREE_SIZE SZ_32M
2800 static bool qgroup_check_limits(struct btrfs_fs_info *fs_info,
2801 const struct btrfs_qgroup *qg, u64 num_bytes)
2802 {
2803 u64 free;
2804 u64 threshold;
2805
2806 if ((qg->lim_flags & BTRFS_QGROUP_LIMIT_MAX_RFER) &&
2807 qgroup_rsv_total(qg) + (s64)qg->rfer + num_bytes > qg->max_rfer)
2808 return false;
2809
2810 if ((qg->lim_flags & BTRFS_QGROUP_LIMIT_MAX_EXCL) &&
2811 qgroup_rsv_total(qg) + (s64)qg->excl + num_bytes > qg->max_excl)
2812 return false;
2813
2814 /*
2815 * Even if we passed the check, it's better to check if reservation
2816 * for meta_pertrans is pushing us near limit.
2817 * If there is too much pertrans reservation or it's near the limit,
2818 * let's try commit transaction to free some, using transaction_kthread
2819 */
2820 if ((qg->lim_flags & (BTRFS_QGROUP_LIMIT_MAX_RFER |
2821 BTRFS_QGROUP_LIMIT_MAX_EXCL))) {
2822 if (qg->lim_flags & BTRFS_QGROUP_LIMIT_MAX_EXCL) {
2823 free = qg->max_excl - qgroup_rsv_total(qg) - qg->excl;
2824 threshold = min_t(u64, qg->max_excl / QGROUP_FREE_RATIO,
2825 QGROUP_FREE_SIZE);
2826 } else {
2827 free = qg->max_rfer - qgroup_rsv_total(qg) - qg->rfer;
2828 threshold = min_t(u64, qg->max_rfer / QGROUP_FREE_RATIO,
2829 QGROUP_FREE_SIZE);
2830 }
2831
2832 /*
2833 * Use transaction_kthread to commit transaction, so we no
2834 * longer need to bother nested transaction nor lock context.
2835 */
2836 if (free < threshold)
2837 btrfs_commit_transaction_locksafe(fs_info);
2838 }
2839
2840 return true;
2841 }
2842
2843 static int qgroup_reserve(struct btrfs_root *root, u64 num_bytes, bool enforce,
2844 enum btrfs_qgroup_rsv_type type)
2845 {
2846 struct btrfs_root *quota_root;
2847 struct btrfs_qgroup *qgroup;
2848 struct btrfs_fs_info *fs_info = root->fs_info;
2849 u64 ref_root = root->root_key.objectid;
2850 int ret = 0;
2851 struct ulist_node *unode;
2852 struct ulist_iterator uiter;
2853
2854 if (!is_fstree(ref_root))
2855 return 0;
2856
2857 if (num_bytes == 0)
2858 return 0;
2859
2860 if (test_bit(BTRFS_FS_QUOTA_OVERRIDE, &fs_info->flags) &&
2861 capable(CAP_SYS_RESOURCE))
2862 enforce = false;
2863
2864 spin_lock(&fs_info->qgroup_lock);
2865 quota_root = fs_info->quota_root;
2866 if (!quota_root)
2867 goto out;
2868
2869 qgroup = find_qgroup_rb(fs_info, ref_root);
2870 if (!qgroup)
2871 goto out;
2872
2873 /*
2874 * in a first step, we check all affected qgroups if any limits would
2875 * be exceeded
2876 */
2877 ulist_reinit(fs_info->qgroup_ulist);
2878 ret = ulist_add(fs_info->qgroup_ulist, qgroup->qgroupid,
2879 qgroup_to_aux(qgroup), GFP_ATOMIC);
2880 if (ret < 0)
2881 goto out;
2882 ULIST_ITER_INIT(&uiter);
2883 while ((unode = ulist_next(fs_info->qgroup_ulist, &uiter))) {
2884 struct btrfs_qgroup *qg;
2885 struct btrfs_qgroup_list *glist;
2886
2887 qg = unode_aux_to_qgroup(unode);
2888
2889 if (enforce && !qgroup_check_limits(fs_info, qg, num_bytes)) {
2890 ret = -EDQUOT;
2891 goto out;
2892 }
2893
2894 list_for_each_entry(glist, &qg->groups, next_group) {
2895 ret = ulist_add(fs_info->qgroup_ulist,
2896 glist->group->qgroupid,
2897 qgroup_to_aux(glist->group), GFP_ATOMIC);
2898 if (ret < 0)
2899 goto out;
2900 }
2901 }
2902 ret = 0;
2903 /*
2904 * no limits exceeded, now record the reservation into all qgroups
2905 */
2906 ULIST_ITER_INIT(&uiter);
2907 while ((unode = ulist_next(fs_info->qgroup_ulist, &uiter))) {
2908 struct btrfs_qgroup *qg;
2909
2910 qg = unode_aux_to_qgroup(unode);
2911
2912 qgroup_rsv_add(fs_info, qg, num_bytes, type);
2913 }
2914
2915 out:
2916 spin_unlock(&fs_info->qgroup_lock);
2917 return ret;
2918 }
2919
2920 /*
2921 * Free @num_bytes of reserved space with @type for qgroup. (Normally level 0
2922 * qgroup).
2923 *
2924 * Will handle all higher level qgroup too.
2925 *
2926 * NOTE: If @num_bytes is (u64)-1, this means to free all bytes of this qgroup.
2927 * This special case is only used for META_PERTRANS type.
2928 */
2929 void btrfs_qgroup_free_refroot(struct btrfs_fs_info *fs_info,
2930 u64 ref_root, u64 num_bytes,
2931 enum btrfs_qgroup_rsv_type type)
2932 {
2933 struct btrfs_root *quota_root;
2934 struct btrfs_qgroup *qgroup;
2935 struct ulist_node *unode;
2936 struct ulist_iterator uiter;
2937 int ret = 0;
2938
2939 if (!is_fstree(ref_root))
2940 return;
2941
2942 if (num_bytes == 0)
2943 return;
2944
2945 if (num_bytes == (u64)-1 && type != BTRFS_QGROUP_RSV_META_PERTRANS) {
2946 WARN(1, "%s: Invalid type to free", __func__);
2947 return;
2948 }
2949 spin_lock(&fs_info->qgroup_lock);
2950
2951 quota_root = fs_info->quota_root;
2952 if (!quota_root)
2953 goto out;
2954
2955 qgroup = find_qgroup_rb(fs_info, ref_root);
2956 if (!qgroup)
2957 goto out;
2958
2959 if (num_bytes == (u64)-1)
2960 /*
2961 * We're freeing all pertrans rsv, get reserved value from
2962 * level 0 qgroup as real num_bytes to free.
2963 */
2964 num_bytes = qgroup->rsv.values[type];
2965
2966 ulist_reinit(fs_info->qgroup_ulist);
2967 ret = ulist_add(fs_info->qgroup_ulist, qgroup->qgroupid,
2968 qgroup_to_aux(qgroup), GFP_ATOMIC);
2969 if (ret < 0)
2970 goto out;
2971 ULIST_ITER_INIT(&uiter);
2972 while ((unode = ulist_next(fs_info->qgroup_ulist, &uiter))) {
2973 struct btrfs_qgroup *qg;
2974 struct btrfs_qgroup_list *glist;
2975
2976 qg = unode_aux_to_qgroup(unode);
2977
2978 qgroup_rsv_release(fs_info, qg, num_bytes, type);
2979
2980 list_for_each_entry(glist, &qg->groups, next_group) {
2981 ret = ulist_add(fs_info->qgroup_ulist,
2982 glist->group->qgroupid,
2983 qgroup_to_aux(glist->group), GFP_ATOMIC);
2984 if (ret < 0)
2985 goto out;
2986 }
2987 }
2988
2989 out:
2990 spin_unlock(&fs_info->qgroup_lock);
2991 }
2992
2993 /*
2994 * Check if the leaf is the last leaf. Which means all node pointers
2995 * are at their last position.
2996 */
2997 static bool is_last_leaf(struct btrfs_path *path)
2998 {
2999 int i;
3000
3001 for (i = 1; i < BTRFS_MAX_LEVEL && path->nodes[i]; i++) {
3002 if (path->slots[i] != btrfs_header_nritems(path->nodes[i]) - 1)
3003 return false;
3004 }
3005 return true;
3006 }
3007
3008 /*
3009 * returns < 0 on error, 0 when more leafs are to be scanned.
3010 * returns 1 when done.
3011 */
3012 static int qgroup_rescan_leaf(struct btrfs_trans_handle *trans,
3013 struct btrfs_path *path)
3014 {
3015 struct btrfs_fs_info *fs_info = trans->fs_info;
3016 struct btrfs_key found;
3017 struct extent_buffer *scratch_leaf = NULL;
3018 struct ulist *roots = NULL;
3019 u64 num_bytes;
3020 bool done;
3021 int slot;
3022 int ret;
3023
3024 mutex_lock(&fs_info->qgroup_rescan_lock);
3025 ret = btrfs_search_slot_for_read(fs_info->extent_root,
3026 &fs_info->qgroup_rescan_progress,
3027 path, 1, 0);
3028
3029 btrfs_debug(fs_info,
3030 "current progress key (%llu %u %llu), search_slot ret %d",
3031 fs_info->qgroup_rescan_progress.objectid,
3032 fs_info->qgroup_rescan_progress.type,
3033 fs_info->qgroup_rescan_progress.offset, ret);
3034
3035 if (ret) {
3036 /*
3037 * The rescan is about to end, we will not be scanning any
3038 * further blocks. We cannot unset the RESCAN flag here, because
3039 * we want to commit the transaction if everything went well.
3040 * To make the live accounting work in this phase, we set our
3041 * scan progress pointer such that every real extent objectid
3042 * will be smaller.
3043 */
3044 fs_info->qgroup_rescan_progress.objectid = (u64)-1;
3045 btrfs_release_path(path);
3046 mutex_unlock(&fs_info->qgroup_rescan_lock);
3047 return ret;
3048 }
3049 done = is_last_leaf(path);
3050
3051 btrfs_item_key_to_cpu(path->nodes[0], &found,
3052 btrfs_header_nritems(path->nodes[0]) - 1);
3053 fs_info->qgroup_rescan_progress.objectid = found.objectid + 1;
3054
3055 scratch_leaf = btrfs_clone_extent_buffer(path->nodes[0]);
3056 if (!scratch_leaf) {
3057 ret = -ENOMEM;
3058 mutex_unlock(&fs_info->qgroup_rescan_lock);
3059 goto out;
3060 }
3061 slot = path->slots[0];
3062 btrfs_release_path(path);
3063 mutex_unlock(&fs_info->qgroup_rescan_lock);
3064
3065 for (; slot < btrfs_header_nritems(scratch_leaf); ++slot) {
3066 btrfs_item_key_to_cpu(scratch_leaf, &found, slot);
3067 if (found.type != BTRFS_EXTENT_ITEM_KEY &&
3068 found.type != BTRFS_METADATA_ITEM_KEY)
3069 continue;
3070 if (found.type == BTRFS_METADATA_ITEM_KEY)
3071 num_bytes = fs_info->nodesize;
3072 else
3073 num_bytes = found.offset;
3074
3075 ret = btrfs_find_all_roots(NULL, fs_info, found.objectid, 0,
3076 &roots, false);
3077 if (ret < 0)
3078 goto out;
3079 /* For rescan, just pass old_roots as NULL */
3080 ret = btrfs_qgroup_account_extent(trans, found.objectid,
3081 num_bytes, NULL, roots);
3082 if (ret < 0)
3083 goto out;
3084 }
3085 out:
3086 if (scratch_leaf)
3087 free_extent_buffer(scratch_leaf);
3088
3089 if (done && !ret) {
3090 ret = 1;
3091 fs_info->qgroup_rescan_progress.objectid = (u64)-1;
3092 }
3093 return ret;
3094 }
3095
3096 static void btrfs_qgroup_rescan_worker(struct btrfs_work *work)
3097 {
3098 struct btrfs_fs_info *fs_info = container_of(work, struct btrfs_fs_info,
3099 qgroup_rescan_work);
3100 struct btrfs_path *path;
3101 struct btrfs_trans_handle *trans = NULL;
3102 int err = -ENOMEM;
3103 int ret = 0;
3104
3105 path = btrfs_alloc_path();
3106 if (!path)
3107 goto out;
3108 /*
3109 * Rescan should only search for commit root, and any later difference
3110 * should be recorded by qgroup
3111 */
3112 path->search_commit_root = 1;
3113 path->skip_locking = 1;
3114
3115 err = 0;
3116 while (!err && !btrfs_fs_closing(fs_info)) {
3117 trans = btrfs_start_transaction(fs_info->fs_root, 0);
3118 if (IS_ERR(trans)) {
3119 err = PTR_ERR(trans);
3120 break;
3121 }
3122 if (!test_bit(BTRFS_FS_QUOTA_ENABLED, &fs_info->flags)) {
3123 err = -EINTR;
3124 } else {
3125 err = qgroup_rescan_leaf(trans, path);
3126 }
3127 if (err > 0)
3128 btrfs_commit_transaction(trans);
3129 else
3130 btrfs_end_transaction(trans);
3131 }
3132
3133 out:
3134 btrfs_free_path(path);
3135
3136 mutex_lock(&fs_info->qgroup_rescan_lock);
3137 if (!btrfs_fs_closing(fs_info))
3138 fs_info->qgroup_flags &= ~BTRFS_QGROUP_STATUS_FLAG_RESCAN;
3139
3140 if (err > 0 &&
3141 fs_info->qgroup_flags & BTRFS_QGROUP_STATUS_FLAG_INCONSISTENT) {
3142 fs_info->qgroup_flags &= ~BTRFS_QGROUP_STATUS_FLAG_INCONSISTENT;
3143 } else if (err < 0) {
3144 fs_info->qgroup_flags |= BTRFS_QGROUP_STATUS_FLAG_INCONSISTENT;
3145 }
3146 mutex_unlock(&fs_info->qgroup_rescan_lock);
3147
3148 /*
3149 * only update status, since the previous part has already updated the
3150 * qgroup info.
3151 */
3152 trans = btrfs_start_transaction(fs_info->quota_root, 1);
3153 if (IS_ERR(trans)) {
3154 err = PTR_ERR(trans);
3155 btrfs_err(fs_info,
3156 "fail to start transaction for status update: %d",
3157 err);
3158 goto done;
3159 }
3160 ret = update_qgroup_status_item(trans);
3161 if (ret < 0) {
3162 err = ret;
3163 btrfs_err(fs_info, "fail to update qgroup status: %d", err);
3164 }
3165 btrfs_end_transaction(trans);
3166
3167 if (btrfs_fs_closing(fs_info)) {
3168 btrfs_info(fs_info, "qgroup scan paused");
3169 } else if (err >= 0) {
3170 btrfs_info(fs_info, "qgroup scan completed%s",
3171 err > 0 ? " (inconsistency flag cleared)" : "");
3172 } else {
3173 btrfs_err(fs_info, "qgroup scan failed with %d", err);
3174 }
3175
3176 done:
3177 mutex_lock(&fs_info->qgroup_rescan_lock);
3178 fs_info->qgroup_rescan_running = false;
3179 mutex_unlock(&fs_info->qgroup_rescan_lock);
3180 complete_all(&fs_info->qgroup_rescan_completion);
3181 }
3182
3183 /*
3184 * Checks that (a) no rescan is running and (b) quota is enabled. Allocates all
3185 * memory required for the rescan context.
3186 */
3187 static int
3188 qgroup_rescan_init(struct btrfs_fs_info *fs_info, u64 progress_objectid,
3189 int init_flags)
3190 {
3191 int ret = 0;
3192
3193 if (!init_flags) {
3194 /* we're resuming qgroup rescan at mount time */
3195 if (!(fs_info->qgroup_flags &
3196 BTRFS_QGROUP_STATUS_FLAG_RESCAN)) {
3197 btrfs_warn(fs_info,
3198 "qgroup rescan init failed, qgroup is not enabled");
3199 ret = -EINVAL;
3200 } else if (!(fs_info->qgroup_flags &
3201 BTRFS_QGROUP_STATUS_FLAG_ON)) {
3202 btrfs_warn(fs_info,
3203 "qgroup rescan init failed, qgroup rescan is not queued");
3204 ret = -EINVAL;
3205 }
3206
3207 if (ret)
3208 return ret;
3209 }
3210
3211 mutex_lock(&fs_info->qgroup_rescan_lock);
3212 spin_lock(&fs_info->qgroup_lock);
3213
3214 if (init_flags) {
3215 if (fs_info->qgroup_flags & BTRFS_QGROUP_STATUS_FLAG_RESCAN) {
3216 btrfs_warn(fs_info,
3217 "qgroup rescan is already in progress");
3218 ret = -EINPROGRESS;
3219 } else if (!(fs_info->qgroup_flags &
3220 BTRFS_QGROUP_STATUS_FLAG_ON)) {
3221 btrfs_warn(fs_info,
3222 "qgroup rescan init failed, qgroup is not enabled");
3223 ret = -EINVAL;
3224 }
3225
3226 if (ret) {
3227 spin_unlock(&fs_info->qgroup_lock);
3228 mutex_unlock(&fs_info->qgroup_rescan_lock);
3229 return ret;
3230 }
3231 fs_info->qgroup_flags |= BTRFS_QGROUP_STATUS_FLAG_RESCAN;
3232 }
3233
3234 memset(&fs_info->qgroup_rescan_progress, 0,
3235 sizeof(fs_info->qgroup_rescan_progress));
3236 fs_info->qgroup_rescan_progress.objectid = progress_objectid;
3237 init_completion(&fs_info->qgroup_rescan_completion);
3238 fs_info->qgroup_rescan_running = true;
3239
3240 spin_unlock(&fs_info->qgroup_lock);
3241 mutex_unlock(&fs_info->qgroup_rescan_lock);
3242
3243 memset(&fs_info->qgroup_rescan_work, 0,
3244 sizeof(fs_info->qgroup_rescan_work));
3245 btrfs_init_work(&fs_info->qgroup_rescan_work,
3246 btrfs_qgroup_rescan_helper,
3247 btrfs_qgroup_rescan_worker, NULL, NULL);
3248 return 0;
3249 }
3250
3251 static void
3252 qgroup_rescan_zero_tracking(struct btrfs_fs_info *fs_info)
3253 {
3254 struct rb_node *n;
3255 struct btrfs_qgroup *qgroup;
3256
3257 spin_lock(&fs_info->qgroup_lock);
3258 /* clear all current qgroup tracking information */
3259 for (n = rb_first(&fs_info->qgroup_tree); n; n = rb_next(n)) {
3260 qgroup = rb_entry(n, struct btrfs_qgroup, node);
3261 qgroup->rfer = 0;
3262 qgroup->rfer_cmpr = 0;
3263 qgroup->excl = 0;
3264 qgroup->excl_cmpr = 0;
3265 qgroup_dirty(fs_info, qgroup);
3266 }
3267 spin_unlock(&fs_info->qgroup_lock);
3268 }
3269
3270 int
3271 btrfs_qgroup_rescan(struct btrfs_fs_info *fs_info)
3272 {
3273 int ret = 0;
3274 struct btrfs_trans_handle *trans;
3275
3276 ret = qgroup_rescan_init(fs_info, 0, 1);
3277 if (ret)
3278 return ret;
3279
3280 /*
3281 * We have set the rescan_progress to 0, which means no more
3282 * delayed refs will be accounted by btrfs_qgroup_account_ref.
3283 * However, btrfs_qgroup_account_ref may be right after its call
3284 * to btrfs_find_all_roots, in which case it would still do the
3285 * accounting.
3286 * To solve this, we're committing the transaction, which will
3287 * ensure we run all delayed refs and only after that, we are
3288 * going to clear all tracking information for a clean start.
3289 */
3290
3291 trans = btrfs_join_transaction(fs_info->fs_root);
3292 if (IS_ERR(trans)) {
3293 fs_info->qgroup_flags &= ~BTRFS_QGROUP_STATUS_FLAG_RESCAN;
3294 return PTR_ERR(trans);
3295 }
3296 ret = btrfs_commit_transaction(trans);
3297 if (ret) {
3298 fs_info->qgroup_flags &= ~BTRFS_QGROUP_STATUS_FLAG_RESCAN;
3299 return ret;
3300 }
3301
3302 qgroup_rescan_zero_tracking(fs_info);
3303
3304 btrfs_queue_work(fs_info->qgroup_rescan_workers,
3305 &fs_info->qgroup_rescan_work);
3306
3307 return 0;
3308 }
3309
3310 int btrfs_qgroup_wait_for_completion(struct btrfs_fs_info *fs_info,
3311 bool interruptible)
3312 {
3313 int running;
3314 int ret = 0;
3315
3316 mutex_lock(&fs_info->qgroup_rescan_lock);
3317 spin_lock(&fs_info->qgroup_lock);
3318 running = fs_info->qgroup_rescan_running;
3319 spin_unlock(&fs_info->qgroup_lock);
3320 mutex_unlock(&fs_info->qgroup_rescan_lock);
3321
3322 if (!running)
3323 return 0;
3324
3325 if (interruptible)
3326 ret = wait_for_completion_interruptible(
3327 &fs_info->qgroup_rescan_completion);
3328 else
3329 wait_for_completion(&fs_info->qgroup_rescan_completion);
3330
3331 return ret;
3332 }
3333
3334 /*
3335 * this is only called from open_ctree where we're still single threaded, thus
3336 * locking is omitted here.
3337 */
3338 void
3339 btrfs_qgroup_rescan_resume(struct btrfs_fs_info *fs_info)
3340 {
3341 if (fs_info->qgroup_flags & BTRFS_QGROUP_STATUS_FLAG_RESCAN)
3342 btrfs_queue_work(fs_info->qgroup_rescan_workers,
3343 &fs_info->qgroup_rescan_work);
3344 }
3345
3346 /*
3347 * Reserve qgroup space for range [start, start + len).
3348 *
3349 * This function will either reserve space from related qgroups or doing
3350 * nothing if the range is already reserved.
3351 *
3352 * Return 0 for successful reserve
3353 * Return <0 for error (including -EQUOT)
3354 *
3355 * NOTE: this function may sleep for memory allocation.
3356 * if btrfs_qgroup_reserve_data() is called multiple times with
3357 * same @reserved, caller must ensure when error happens it's OK
3358 * to free *ALL* reserved space.
3359 */
3360 int btrfs_qgroup_reserve_data(struct inode *inode,
3361 struct extent_changeset **reserved_ret, u64 start,
3362 u64 len)
3363 {
3364 struct btrfs_root *root = BTRFS_I(inode)->root;
3365 struct ulist_node *unode;
3366 struct ulist_iterator uiter;
3367 struct extent_changeset *reserved;
3368 u64 orig_reserved;
3369 u64 to_reserve;
3370 int ret;
3371
3372 if (!test_bit(BTRFS_FS_QUOTA_ENABLED, &root->fs_info->flags) ||
3373 !is_fstree(root->root_key.objectid) || len == 0)
3374 return 0;
3375
3376 /* @reserved parameter is mandatory for qgroup */
3377 if (WARN_ON(!reserved_ret))
3378 return -EINVAL;
3379 if (!*reserved_ret) {
3380 *reserved_ret = extent_changeset_alloc();
3381 if (!*reserved_ret)
3382 return -ENOMEM;
3383 }
3384 reserved = *reserved_ret;
3385 /* Record already reserved space */
3386 orig_reserved = reserved->bytes_changed;
3387 ret = set_record_extent_bits(&BTRFS_I(inode)->io_tree, start,
3388 start + len -1, EXTENT_QGROUP_RESERVED, reserved);
3389
3390 /* Newly reserved space */
3391 to_reserve = reserved->bytes_changed - orig_reserved;
3392 trace_btrfs_qgroup_reserve_data(inode, start, len,
3393 to_reserve, QGROUP_RESERVE);
3394 if (ret < 0)
3395 goto cleanup;
3396 ret = qgroup_reserve(root, to_reserve, true, BTRFS_QGROUP_RSV_DATA);
3397 if (ret < 0)
3398 goto cleanup;
3399
3400 return ret;
3401
3402 cleanup:
3403 /* cleanup *ALL* already reserved ranges */
3404 ULIST_ITER_INIT(&uiter);
3405 while ((unode = ulist_next(&reserved->range_changed, &uiter)))
3406 clear_extent_bit(&BTRFS_I(inode)->io_tree, unode->val,
3407 unode->aux, EXTENT_QGROUP_RESERVED, 0, 0, NULL);
3408 extent_changeset_release(reserved);
3409 return ret;
3410 }
3411
3412 /* Free ranges specified by @reserved, normally in error path */
3413 static int qgroup_free_reserved_data(struct inode *inode,
3414 struct extent_changeset *reserved, u64 start, u64 len)
3415 {
3416 struct btrfs_root *root = BTRFS_I(inode)->root;
3417 struct ulist_node *unode;
3418 struct ulist_iterator uiter;
3419 struct extent_changeset changeset;
3420 int freed = 0;
3421 int ret;
3422
3423 extent_changeset_init(&changeset);
3424 len = round_up(start + len, root->fs_info->sectorsize);
3425 start = round_down(start, root->fs_info->sectorsize);
3426
3427 ULIST_ITER_INIT(&uiter);
3428 while ((unode = ulist_next(&reserved->range_changed, &uiter))) {
3429 u64 range_start = unode->val;
3430 /* unode->aux is the inclusive end */
3431 u64 range_len = unode->aux - range_start + 1;
3432 u64 free_start;
3433 u64 free_len;
3434
3435 extent_changeset_release(&changeset);
3436
3437 /* Only free range in range [start, start + len) */
3438 if (range_start >= start + len ||
3439 range_start + range_len <= start)
3440 continue;
3441 free_start = max(range_start, start);
3442 free_len = min(start + len, range_start + range_len) -
3443 free_start;
3444 /*
3445 * TODO: To also modify reserved->ranges_reserved to reflect
3446 * the modification.
3447 *
3448 * However as long as we free qgroup reserved according to
3449 * EXTENT_QGROUP_RESERVED, we won't double free.
3450 * So not need to rush.
3451 */
3452 ret = clear_record_extent_bits(&BTRFS_I(inode)->io_failure_tree,
3453 free_start, free_start + free_len - 1,
3454 EXTENT_QGROUP_RESERVED, &changeset);
3455 if (ret < 0)
3456 goto out;
3457 freed += changeset.bytes_changed;
3458 }
3459 btrfs_qgroup_free_refroot(root->fs_info, root->root_key.objectid, freed,
3460 BTRFS_QGROUP_RSV_DATA);
3461 ret = freed;
3462 out:
3463 extent_changeset_release(&changeset);
3464 return ret;
3465 }
3466
3467 static int __btrfs_qgroup_release_data(struct inode *inode,
3468 struct extent_changeset *reserved, u64 start, u64 len,
3469 int free)
3470 {
3471 struct extent_changeset changeset;
3472 int trace_op = QGROUP_RELEASE;
3473 int ret;
3474
3475 if (!test_bit(BTRFS_FS_QUOTA_ENABLED,
3476 &BTRFS_I(inode)->root->fs_info->flags))
3477 return 0;
3478
3479 /* In release case, we shouldn't have @reserved */
3480 WARN_ON(!free && reserved);
3481 if (free && reserved)
3482 return qgroup_free_reserved_data(inode, reserved, start, len);
3483 extent_changeset_init(&changeset);
3484 ret = clear_record_extent_bits(&BTRFS_I(inode)->io_tree, start,
3485 start + len -1, EXTENT_QGROUP_RESERVED, &changeset);
3486 if (ret < 0)
3487 goto out;
3488
3489 if (free)
3490 trace_op = QGROUP_FREE;
3491 trace_btrfs_qgroup_release_data(inode, start, len,
3492 changeset.bytes_changed, trace_op);
3493 if (free)
3494 btrfs_qgroup_free_refroot(BTRFS_I(inode)->root->fs_info,
3495 BTRFS_I(inode)->root->root_key.objectid,
3496 changeset.bytes_changed, BTRFS_QGROUP_RSV_DATA);
3497 ret = changeset.bytes_changed;
3498 out:
3499 extent_changeset_release(&changeset);
3500 return ret;
3501 }
3502
3503 /*
3504 * Free a reserved space range from io_tree and related qgroups
3505 *
3506 * Should be called when a range of pages get invalidated before reaching disk.
3507 * Or for error cleanup case.
3508 * if @reserved is given, only reserved range in [@start, @start + @len) will
3509 * be freed.
3510 *
3511 * For data written to disk, use btrfs_qgroup_release_data().
3512 *
3513 * NOTE: This function may sleep for memory allocation.
3514 */
3515 int btrfs_qgroup_free_data(struct inode *inode,
3516 struct extent_changeset *reserved, u64 start, u64 len)
3517 {
3518 return __btrfs_qgroup_release_data(inode, reserved, start, len, 1);
3519 }
3520
3521 /*
3522 * Release a reserved space range from io_tree only.
3523 *
3524 * Should be called when a range of pages get written to disk and corresponding
3525 * FILE_EXTENT is inserted into corresponding root.
3526 *
3527 * Since new qgroup accounting framework will only update qgroup numbers at
3528 * commit_transaction() time, its reserved space shouldn't be freed from
3529 * related qgroups.
3530 *
3531 * But we should release the range from io_tree, to allow further write to be
3532 * COWed.
3533 *
3534 * NOTE: This function may sleep for memory allocation.
3535 */
3536 int btrfs_qgroup_release_data(struct inode *inode, u64 start, u64 len)
3537 {
3538 return __btrfs_qgroup_release_data(inode, NULL, start, len, 0);
3539 }
3540
3541 static void add_root_meta_rsv(struct btrfs_root *root, int num_bytes,
3542 enum btrfs_qgroup_rsv_type type)
3543 {
3544 if (type != BTRFS_QGROUP_RSV_META_PREALLOC &&
3545 type != BTRFS_QGROUP_RSV_META_PERTRANS)
3546 return;
3547 if (num_bytes == 0)
3548 return;
3549
3550 spin_lock(&root->qgroup_meta_rsv_lock);
3551 if (type == BTRFS_QGROUP_RSV_META_PREALLOC)
3552 root->qgroup_meta_rsv_prealloc += num_bytes;
3553 else
3554 root->qgroup_meta_rsv_pertrans += num_bytes;
3555 spin_unlock(&root->qgroup_meta_rsv_lock);
3556 }
3557
3558 static int sub_root_meta_rsv(struct btrfs_root *root, int num_bytes,
3559 enum btrfs_qgroup_rsv_type type)
3560 {
3561 if (type != BTRFS_QGROUP_RSV_META_PREALLOC &&
3562 type != BTRFS_QGROUP_RSV_META_PERTRANS)
3563 return 0;
3564 if (num_bytes == 0)
3565 return 0;
3566
3567 spin_lock(&root->qgroup_meta_rsv_lock);
3568 if (type == BTRFS_QGROUP_RSV_META_PREALLOC) {
3569 num_bytes = min_t(u64, root->qgroup_meta_rsv_prealloc,
3570 num_bytes);
3571 root->qgroup_meta_rsv_prealloc -= num_bytes;
3572 } else {
3573 num_bytes = min_t(u64, root->qgroup_meta_rsv_pertrans,
3574 num_bytes);
3575 root->qgroup_meta_rsv_pertrans -= num_bytes;
3576 }
3577 spin_unlock(&root->qgroup_meta_rsv_lock);
3578 return num_bytes;
3579 }
3580
3581 int __btrfs_qgroup_reserve_meta(struct btrfs_root *root, int num_bytes,
3582 enum btrfs_qgroup_rsv_type type, bool enforce)
3583 {
3584 struct btrfs_fs_info *fs_info = root->fs_info;
3585 int ret;
3586
3587 if (!test_bit(BTRFS_FS_QUOTA_ENABLED, &fs_info->flags) ||
3588 !is_fstree(root->root_key.objectid) || num_bytes == 0)
3589 return 0;
3590
3591 BUG_ON(num_bytes != round_down(num_bytes, fs_info->nodesize));
3592 trace_qgroup_meta_reserve(root, type, (s64)num_bytes);
3593 ret = qgroup_reserve(root, num_bytes, enforce, type);
3594 if (ret < 0)
3595 return ret;
3596 /*
3597 * Record what we have reserved into root.
3598 *
3599 * To avoid quota disabled->enabled underflow.
3600 * In that case, we may try to free space we haven't reserved
3601 * (since quota was disabled), so record what we reserved into root.
3602 * And ensure later release won't underflow this number.
3603 */
3604 add_root_meta_rsv(root, num_bytes, type);
3605 return ret;
3606 }
3607
3608 void btrfs_qgroup_free_meta_all_pertrans(struct btrfs_root *root)
3609 {
3610 struct btrfs_fs_info *fs_info = root->fs_info;
3611
3612 if (!test_bit(BTRFS_FS_QUOTA_ENABLED, &fs_info->flags) ||
3613 !is_fstree(root->root_key.objectid))
3614 return;
3615
3616 /* TODO: Update trace point to handle such free */
3617 trace_qgroup_meta_free_all_pertrans(root);
3618 /* Special value -1 means to free all reserved space */
3619 btrfs_qgroup_free_refroot(fs_info, root->root_key.objectid, (u64)-1,
3620 BTRFS_QGROUP_RSV_META_PERTRANS);
3621 }
3622
3623 void __btrfs_qgroup_free_meta(struct btrfs_root *root, int num_bytes,
3624 enum btrfs_qgroup_rsv_type type)
3625 {
3626 struct btrfs_fs_info *fs_info = root->fs_info;
3627
3628 if (!test_bit(BTRFS_FS_QUOTA_ENABLED, &fs_info->flags) ||
3629 !is_fstree(root->root_key.objectid))
3630 return;
3631
3632 /*
3633 * reservation for META_PREALLOC can happen before quota is enabled,
3634 * which can lead to underflow.
3635 * Here ensure we will only free what we really have reserved.
3636 */
3637 num_bytes = sub_root_meta_rsv(root, num_bytes, type);
3638 BUG_ON(num_bytes != round_down(num_bytes, fs_info->nodesize));
3639 trace_qgroup_meta_reserve(root, type, -(s64)num_bytes);
3640 btrfs_qgroup_free_refroot(fs_info, root->root_key.objectid,
3641 num_bytes, type);
3642 }
3643
3644 static void qgroup_convert_meta(struct btrfs_fs_info *fs_info, u64 ref_root,
3645 int num_bytes)
3646 {
3647 struct btrfs_root *quota_root = fs_info->quota_root;
3648 struct btrfs_qgroup *qgroup;
3649 struct ulist_node *unode;
3650 struct ulist_iterator uiter;
3651 int ret = 0;
3652
3653 if (num_bytes == 0)
3654 return;
3655 if (!quota_root)
3656 return;
3657
3658 spin_lock(&fs_info->qgroup_lock);
3659 qgroup = find_qgroup_rb(fs_info, ref_root);
3660 if (!qgroup)
3661 goto out;
3662 ulist_reinit(fs_info->qgroup_ulist);
3663 ret = ulist_add(fs_info->qgroup_ulist, qgroup->qgroupid,
3664 qgroup_to_aux(qgroup), GFP_ATOMIC);
3665 if (ret < 0)
3666 goto out;
3667 ULIST_ITER_INIT(&uiter);
3668 while ((unode = ulist_next(fs_info->qgroup_ulist, &uiter))) {
3669 struct btrfs_qgroup *qg;
3670 struct btrfs_qgroup_list *glist;
3671
3672 qg = unode_aux_to_qgroup(unode);
3673
3674 qgroup_rsv_release(fs_info, qg, num_bytes,
3675 BTRFS_QGROUP_RSV_META_PREALLOC);
3676 qgroup_rsv_add(fs_info, qg, num_bytes,
3677 BTRFS_QGROUP_RSV_META_PERTRANS);
3678 list_for_each_entry(glist, &qg->groups, next_group) {
3679 ret = ulist_add(fs_info->qgroup_ulist,
3680 glist->group->qgroupid,
3681 qgroup_to_aux(glist->group), GFP_ATOMIC);
3682 if (ret < 0)
3683 goto out;
3684 }
3685 }
3686 out:
3687 spin_unlock(&fs_info->qgroup_lock);
3688 }
3689
3690 void btrfs_qgroup_convert_reserved_meta(struct btrfs_root *root, int num_bytes)
3691 {
3692 struct btrfs_fs_info *fs_info = root->fs_info;
3693
3694 if (!test_bit(BTRFS_FS_QUOTA_ENABLED, &fs_info->flags) ||
3695 !is_fstree(root->root_key.objectid))
3696 return;
3697 /* Same as btrfs_qgroup_free_meta_prealloc() */
3698 num_bytes = sub_root_meta_rsv(root, num_bytes,
3699 BTRFS_QGROUP_RSV_META_PREALLOC);
3700 trace_qgroup_meta_convert(root, num_bytes);
3701 qgroup_convert_meta(fs_info, root->root_key.objectid, num_bytes);
3702 }
3703
3704 /*
3705 * Check qgroup reserved space leaking, normally at destroy inode
3706 * time
3707 */
3708 void btrfs_qgroup_check_reserved_leak(struct inode *inode)
3709 {
3710 struct extent_changeset changeset;
3711 struct ulist_node *unode;
3712 struct ulist_iterator iter;
3713 int ret;
3714
3715 extent_changeset_init(&changeset);
3716 ret = clear_record_extent_bits(&BTRFS_I(inode)->io_tree, 0, (u64)-1,
3717 EXTENT_QGROUP_RESERVED, &changeset);
3718
3719 WARN_ON(ret < 0);
3720 if (WARN_ON(changeset.bytes_changed)) {
3721 ULIST_ITER_INIT(&iter);
3722 while ((unode = ulist_next(&changeset.range_changed, &iter))) {
3723 btrfs_warn(BTRFS_I(inode)->root->fs_info,
3724 "leaking qgroup reserved space, ino: %lu, start: %llu, end: %llu",
3725 inode->i_ino, unode->val, unode->aux);
3726 }
3727 btrfs_qgroup_free_refroot(BTRFS_I(inode)->root->fs_info,
3728 BTRFS_I(inode)->root->root_key.objectid,
3729 changeset.bytes_changed, BTRFS_QGROUP_RSV_DATA);
3730
3731 }
3732 extent_changeset_release(&changeset);
3733 }
3734
3735 void btrfs_qgroup_init_swapped_blocks(
3736 struct btrfs_qgroup_swapped_blocks *swapped_blocks)
3737 {
3738 int i;
3739
3740 spin_lock_init(&swapped_blocks->lock);
3741 for (i = 0; i < BTRFS_MAX_LEVEL; i++)
3742 swapped_blocks->blocks[i] = RB_ROOT;
3743 swapped_blocks->swapped = false;
3744 }
3745
3746 /*
3747 * Delete all swapped blocks record of @root.
3748 * Every record here means we skipped a full subtree scan for qgroup.
3749 *
3750 * Gets called when committing one transaction.
3751 */
3752 void btrfs_qgroup_clean_swapped_blocks(struct btrfs_root *root)
3753 {
3754 struct btrfs_qgroup_swapped_blocks *swapped_blocks;
3755 int i;
3756
3757 swapped_blocks = &root->swapped_blocks;
3758
3759 spin_lock(&swapped_blocks->lock);
3760 if (!swapped_blocks->swapped)
3761 goto out;
3762 for (i = 0; i < BTRFS_MAX_LEVEL; i++) {
3763 struct rb_root *cur_root = &swapped_blocks->blocks[i];
3764 struct btrfs_qgroup_swapped_block *entry;
3765 struct btrfs_qgroup_swapped_block *next;
3766
3767 rbtree_postorder_for_each_entry_safe(entry, next, cur_root,
3768 node)
3769 kfree(entry);
3770 swapped_blocks->blocks[i] = RB_ROOT;
3771 }
3772 swapped_blocks->swapped = false;
3773 out:
3774 spin_unlock(&swapped_blocks->lock);
3775 }
3776
3777 /*
3778 * Add subtree roots record into @subvol_root.
3779 *
3780 * @subvol_root: tree root of the subvolume tree get swapped
3781 * @bg: block group under balance
3782 * @subvol_parent/slot: pointer to the subtree root in subvolume tree
3783 * @reloc_parent/slot: pointer to the subtree root in reloc tree
3784 * BOTH POINTERS ARE BEFORE TREE SWAP
3785 * @last_snapshot: last snapshot generation of the subvolume tree
3786 */
3787 int btrfs_qgroup_add_swapped_blocks(struct btrfs_trans_handle *trans,
3788 struct btrfs_root *subvol_root,
3789 struct btrfs_block_group_cache *bg,
3790 struct extent_buffer *subvol_parent, int subvol_slot,
3791 struct extent_buffer *reloc_parent, int reloc_slot,
3792 u64 last_snapshot)
3793 {
3794 struct btrfs_fs_info *fs_info = subvol_root->fs_info;
3795 struct btrfs_qgroup_swapped_blocks *blocks = &subvol_root->swapped_blocks;
3796 struct btrfs_qgroup_swapped_block *block;
3797 struct rb_node **cur;
3798 struct rb_node *parent = NULL;
3799 int level = btrfs_header_level(subvol_parent) - 1;
3800 int ret = 0;
3801
3802 if (!test_bit(BTRFS_FS_QUOTA_ENABLED, &fs_info->flags))
3803 return 0;
3804
3805 if (btrfs_node_ptr_generation(subvol_parent, subvol_slot) >
3806 btrfs_node_ptr_generation(reloc_parent, reloc_slot)) {
3807 btrfs_err_rl(fs_info,
3808 "%s: bad parameter order, subvol_gen=%llu reloc_gen=%llu",
3809 __func__,
3810 btrfs_node_ptr_generation(subvol_parent, subvol_slot),
3811 btrfs_node_ptr_generation(reloc_parent, reloc_slot));
3812 return -EUCLEAN;
3813 }
3814
3815 block = kmalloc(sizeof(*block), GFP_NOFS);
3816 if (!block) {
3817 ret = -ENOMEM;
3818 goto out;
3819 }
3820
3821 /*
3822 * @reloc_parent/slot is still before swap, while @block is going to
3823 * record the bytenr after swap, so we do the swap here.
3824 */
3825 block->subvol_bytenr = btrfs_node_blockptr(reloc_parent, reloc_slot);
3826 block->subvol_generation = btrfs_node_ptr_generation(reloc_parent,
3827 reloc_slot);
3828 block->reloc_bytenr = btrfs_node_blockptr(subvol_parent, subvol_slot);
3829 block->reloc_generation = btrfs_node_ptr_generation(subvol_parent,
3830 subvol_slot);
3831 block->last_snapshot = last_snapshot;
3832 block->level = level;
3833
3834 /*
3835 * If we have bg == NULL, we're called from btrfs_recover_relocation(),
3836 * no one else can modify tree blocks thus we qgroup will not change
3837 * no matter the value of trace_leaf.
3838 */
3839 if (bg && bg->flags & BTRFS_BLOCK_GROUP_DATA)
3840 block->trace_leaf = true;
3841 else
3842 block->trace_leaf = false;
3843 btrfs_node_key_to_cpu(reloc_parent, &block->first_key, reloc_slot);
3844
3845 /* Insert @block into @blocks */
3846 spin_lock(&blocks->lock);
3847 cur = &blocks->blocks[level].rb_node;
3848 while (*cur) {
3849 struct btrfs_qgroup_swapped_block *entry;
3850
3851 parent = *cur;
3852 entry = rb_entry(parent, struct btrfs_qgroup_swapped_block,
3853 node);
3854
3855 if (entry->subvol_bytenr < block->subvol_bytenr) {
3856 cur = &(*cur)->rb_left;
3857 } else if (entry->subvol_bytenr > block->subvol_bytenr) {
3858 cur = &(*cur)->rb_right;
3859 } else {
3860 if (entry->subvol_generation !=
3861 block->subvol_generation ||
3862 entry->reloc_bytenr != block->reloc_bytenr ||
3863 entry->reloc_generation !=
3864 block->reloc_generation) {
3865 /*
3866 * Duplicated but mismatch entry found.
3867 * Shouldn't happen.
3868 *
3869 * Marking qgroup inconsistent should be enough
3870 * for end users.
3871 */
3872 WARN_ON(IS_ENABLED(CONFIG_BTRFS_DEBUG));
3873 ret = -EEXIST;
3874 }
3875 kfree(block);
3876 goto out_unlock;
3877 }
3878 }
3879 rb_link_node(&block->node, parent, cur);
3880 rb_insert_color(&block->node, &blocks->blocks[level]);
3881 blocks->swapped = true;
3882 out_unlock:
3883 spin_unlock(&blocks->lock);
3884 out:
3885 if (ret < 0)
3886 fs_info->qgroup_flags |=
3887 BTRFS_QGROUP_STATUS_FLAG_INCONSISTENT;
3888 return ret;
3889 }
3890
3891 /*
3892 * Check if the tree block is a subtree root, and if so do the needed
3893 * delayed subtree trace for qgroup.
3894 *
3895 * This is called during btrfs_cow_block().
3896 */
3897 int btrfs_qgroup_trace_subtree_after_cow(struct btrfs_trans_handle *trans,
3898 struct btrfs_root *root,
3899 struct extent_buffer *subvol_eb)
3900 {
3901 struct btrfs_fs_info *fs_info = root->fs_info;
3902 struct btrfs_qgroup_swapped_blocks *blocks = &root->swapped_blocks;
3903 struct btrfs_qgroup_swapped_block *block;
3904 struct extent_buffer *reloc_eb = NULL;
3905 struct rb_node *node;
3906 bool found = false;
3907 bool swapped = false;
3908 int level = btrfs_header_level(subvol_eb);
3909 int ret = 0;
3910 int i;
3911
3912 if (!test_bit(BTRFS_FS_QUOTA_ENABLED, &fs_info->flags))
3913 return 0;
3914 if (!is_fstree(root->root_key.objectid) || !root->reloc_root)
3915 return 0;
3916
3917 spin_lock(&blocks->lock);
3918 if (!blocks->swapped) {
3919 spin_unlock(&blocks->lock);
3920 return 0;
3921 }
3922 node = blocks->blocks[level].rb_node;
3923
3924 while (node) {
3925 block = rb_entry(node, struct btrfs_qgroup_swapped_block, node);
3926 if (block->subvol_bytenr < subvol_eb->start) {
3927 node = node->rb_left;
3928 } else if (block->subvol_bytenr > subvol_eb->start) {
3929 node = node->rb_right;
3930 } else {
3931 found = true;
3932 break;
3933 }
3934 }
3935 if (!found) {
3936 spin_unlock(&blocks->lock);
3937 goto out;
3938 }
3939 /* Found one, remove it from @blocks first and update blocks->swapped */
3940 rb_erase(&block->node, &blocks->blocks[level]);
3941 for (i = 0; i < BTRFS_MAX_LEVEL; i++) {
3942 if (RB_EMPTY_ROOT(&blocks->blocks[i])) {
3943 swapped = true;
3944 break;
3945 }
3946 }
3947 blocks->swapped = swapped;
3948 spin_unlock(&blocks->lock);
3949
3950 /* Read out reloc subtree root */
3951 reloc_eb = read_tree_block(fs_info, block->reloc_bytenr,
3952 block->reloc_generation, block->level,
3953 &block->first_key);
3954 if (IS_ERR(reloc_eb)) {
3955 ret = PTR_ERR(reloc_eb);
3956 reloc_eb = NULL;
3957 goto free_out;
3958 }
3959 if (!extent_buffer_uptodate(reloc_eb)) {
3960 ret = -EIO;
3961 goto free_out;
3962 }
3963
3964 ret = qgroup_trace_subtree_swap(trans, reloc_eb, subvol_eb,
3965 block->last_snapshot, block->trace_leaf);
3966 free_out:
3967 kfree(block);
3968 free_extent_buffer(reloc_eb);
3969 out:
3970 if (ret < 0) {
3971 btrfs_err_rl(fs_info,
3972 "failed to account subtree at bytenr %llu: %d",
3973 subvol_eb->start, ret);
3974 fs_info->qgroup_flags |= BTRFS_QGROUP_STATUS_FLAG_INCONSISTENT;
3975 }
3976 return ret;
3977 }
Ubuntu Hirsute Linux kernel mirror