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ARM: tegra: Rename tegra20 clock file
[linux-2.6.git] / fs / btrfs / qgroup.c
blob38b42e7bc91d0e258a7fd086d793aae3d43ac4c1
1 /*
2 * Copyright (C) 2011 STRATO. All rights reserved.
3 *
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public
6 * License v2 as published by the Free Software Foundation.
7 *
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
11 * General Public License for more details.
12 *
13 * You should have received a copy of the GNU General Public
14 * License along with this program; if not, write to the
15 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
16 * Boston, MA 021110-1307, USA.
17 */
18
19 #include <linux/sched.h>
20 #include <linux/pagemap.h>
21 #include <linux/writeback.h>
22 #include <linux/blkdev.h>
23 #include <linux/rbtree.h>
24 #include <linux/slab.h>
25 #include <linux/workqueue.h>
26
27 #include "ctree.h"
28 #include "transaction.h"
29 #include "disk-io.h"
30 #include "locking.h"
31 #include "ulist.h"
32 #include "ioctl.h"
33 #include "backref.h"
34
35 /* TODO XXX FIXME
36 * - subvol delete -> delete when ref goes to 0? delete limits also?
37 * - reorganize keys
38 * - compressed
39 * - sync
40 * - rescan
41 * - copy also limits on subvol creation
42 * - limit
43 * - caches fuer ulists
44 * - performance benchmarks
45 * - check all ioctl parameters
46 */
47
48 /*
49 * one struct for each qgroup, organized in fs_info->qgroup_tree.
50 */
51 struct btrfs_qgroup {
52 u64 qgroupid;
53
54 /*
55 * state
56 */
57 u64 rfer; /* referenced */
58 u64 rfer_cmpr; /* referenced compressed */
59 u64 excl; /* exclusive */
60 u64 excl_cmpr; /* exclusive compressed */
61
62 /*
63 * limits
64 */
65 u64 lim_flags; /* which limits are set */
66 u64 max_rfer;
67 u64 max_excl;
68 u64 rsv_rfer;
69 u64 rsv_excl;
70
71 /*
72 * reservation tracking
73 */
74 u64 reserved;
75
76 /*
77 * lists
78 */
79 struct list_head groups; /* groups this group is member of */
80 struct list_head members; /* groups that are members of this group */
81 struct list_head dirty; /* dirty groups */
82 struct rb_node node; /* tree of qgroups */
83
84 /*
85 * temp variables for accounting operations
86 */
87 u64 tag;
88 u64 refcnt;
89 };
90
91 /*
92 * glue structure to represent the relations between qgroups.
93 */
94 struct btrfs_qgroup_list {
95 struct list_head next_group;
96 struct list_head next_member;
97 struct btrfs_qgroup *group;
98 struct btrfs_qgroup *member;
99 };
100
101 /* must be called with qgroup_lock held */
102 static struct btrfs_qgroup *find_qgroup_rb(struct btrfs_fs_info *fs_info,
103 u64 qgroupid)
104 {
105 struct rb_node *n = fs_info->qgroup_tree.rb_node;
106 struct btrfs_qgroup *qgroup;
107
108 while (n) {
109 qgroup = rb_entry(n, struct btrfs_qgroup, node);
110 if (qgroup->qgroupid < qgroupid)
111 n = n->rb_left;
112 else if (qgroup->qgroupid > qgroupid)
113 n = n->rb_right;
114 else
115 return qgroup;
116 }
117 return NULL;
118 }
119
120 /* must be called with qgroup_lock held */
121 static struct btrfs_qgroup *add_qgroup_rb(struct btrfs_fs_info *fs_info,
122 u64 qgroupid)
123 {
124 struct rb_node **p = &fs_info->qgroup_tree.rb_node;
125 struct rb_node *parent = NULL;
126 struct btrfs_qgroup *qgroup;
127
128 while (*p) {
129 parent = *p;
130 qgroup = rb_entry(parent, struct btrfs_qgroup, node);
131
132 if (qgroup->qgroupid < qgroupid)
133 p = &(*p)->rb_left;
134 else if (qgroup->qgroupid > qgroupid)
135 p = &(*p)->rb_right;
136 else
137 return qgroup;
138 }
139
140 qgroup = kzalloc(sizeof(*qgroup), GFP_ATOMIC);
141 if (!qgroup)
142 return ERR_PTR(-ENOMEM);
143
144 qgroup->qgroupid = qgroupid;
145 INIT_LIST_HEAD(&qgroup->groups);
146 INIT_LIST_HEAD(&qgroup->members);
147 INIT_LIST_HEAD(&qgroup->dirty);
148
149 rb_link_node(&qgroup->node, parent, p);
150 rb_insert_color(&qgroup->node, &fs_info->qgroup_tree);
151
152 return qgroup;
153 }
154
155 /* must be called with qgroup_lock held */
156 static int del_qgroup_rb(struct btrfs_fs_info *fs_info, u64 qgroupid)
157 {
158 struct btrfs_qgroup *qgroup = find_qgroup_rb(fs_info, qgroupid);
159 struct btrfs_qgroup_list *list;
160
161 if (!qgroup)
162 return -ENOENT;
163
164 rb_erase(&qgroup->node, &fs_info->qgroup_tree);
165 list_del(&qgroup->dirty);
166
167 while (!list_empty(&qgroup->groups)) {
168 list = list_first_entry(&qgroup->groups,
169 struct btrfs_qgroup_list, next_group);
170 list_del(&list->next_group);
171 list_del(&list->next_member);
172 kfree(list);
173 }
174
175 while (!list_empty(&qgroup->members)) {
176 list = list_first_entry(&qgroup->members,
177 struct btrfs_qgroup_list, next_member);
178 list_del(&list->next_group);
179 list_del(&list->next_member);
180 kfree(list);
181 }
182 kfree(qgroup);
183
184 return 0;
185 }
186
187 /* must be called with qgroup_lock held */
188 static int add_relation_rb(struct btrfs_fs_info *fs_info,
189 u64 memberid, u64 parentid)
190 {
191 struct btrfs_qgroup *member;
192 struct btrfs_qgroup *parent;
193 struct btrfs_qgroup_list *list;
194
195 member = find_qgroup_rb(fs_info, memberid);
196 parent = find_qgroup_rb(fs_info, parentid);
197 if (!member || !parent)
198 return -ENOENT;
199
200 list = kzalloc(sizeof(*list), GFP_ATOMIC);
201 if (!list)
202 return -ENOMEM;
203
204 list->group = parent;
205 list->member = member;
206 list_add_tail(&list->next_group, &member->groups);
207 list_add_tail(&list->next_member, &parent->members);
208
209 return 0;
210 }
211
212 /* must be called with qgroup_lock held */
213 static int del_relation_rb(struct btrfs_fs_info *fs_info,
214 u64 memberid, u64 parentid)
215 {
216 struct btrfs_qgroup *member;
217 struct btrfs_qgroup *parent;
218 struct btrfs_qgroup_list *list;
219
220 member = find_qgroup_rb(fs_info, memberid);
221 parent = find_qgroup_rb(fs_info, parentid);
222 if (!member || !parent)
223 return -ENOENT;
224
225 list_for_each_entry(list, &member->groups, next_group) {
226 if (list->group == parent) {
227 list_del(&list->next_group);
228 list_del(&list->next_member);
229 kfree(list);
230 return 0;
231 }
232 }
233 return -ENOENT;
234 }
235
236 /*
237 * The full config is read in one go, only called from open_ctree()
238 * It doesn't use any locking, as at this point we're still single-threaded
239 */
240 int btrfs_read_qgroup_config(struct btrfs_fs_info *fs_info)
241 {
242 struct btrfs_key key;
243 struct btrfs_key found_key;
244 struct btrfs_root *quota_root = fs_info->quota_root;
245 struct btrfs_path *path = NULL;
246 struct extent_buffer *l;
247 int slot;
248 int ret = 0;
249 u64 flags = 0;
250
251 if (!fs_info->quota_enabled)
252 return 0;
253
254 path = btrfs_alloc_path();
255 if (!path) {
256 ret = -ENOMEM;
257 goto out;
258 }
259
260 /* default this to quota off, in case no status key is found */
261 fs_info->qgroup_flags = 0;
262
263 /*
264 * pass 1: read status, all qgroup infos and limits
265 */
266 key.objectid = 0;
267 key.type = 0;
268 key.offset = 0;
269 ret = btrfs_search_slot_for_read(quota_root, &key, path, 1, 1);
270 if (ret)
271 goto out;
272
273 while (1) {
274 struct btrfs_qgroup *qgroup;
275
276 slot = path->slots[0];
277 l = path->nodes[0];
278 btrfs_item_key_to_cpu(l, &found_key, slot);
279
280 if (found_key.type == BTRFS_QGROUP_STATUS_KEY) {
281 struct btrfs_qgroup_status_item *ptr;
282
283 ptr = btrfs_item_ptr(l, slot,
284 struct btrfs_qgroup_status_item);
285
286 if (btrfs_qgroup_status_version(l, ptr) !=
287 BTRFS_QGROUP_STATUS_VERSION) {
288 printk(KERN_ERR
289 "btrfs: old qgroup version, quota disabled\n");
290 goto out;
291 }
292 if (btrfs_qgroup_status_generation(l, ptr) !=
293 fs_info->generation) {
294 flags |= BTRFS_QGROUP_STATUS_FLAG_INCONSISTENT;
295 printk(KERN_ERR
296 "btrfs: qgroup generation mismatch, "
297 "marked as inconsistent\n");
298 }
299 fs_info->qgroup_flags = btrfs_qgroup_status_flags(l,
300 ptr);
301 /* FIXME read scan element */
302 goto next1;
303 }
304
305 if (found_key.type != BTRFS_QGROUP_INFO_KEY &&
306 found_key.type != BTRFS_QGROUP_LIMIT_KEY)
307 goto next1;
308
309 qgroup = find_qgroup_rb(fs_info, found_key.offset);
310 if ((qgroup && found_key.type == BTRFS_QGROUP_INFO_KEY) ||
311 (!qgroup && found_key.type == BTRFS_QGROUP_LIMIT_KEY)) {
312 printk(KERN_ERR "btrfs: inconsitent qgroup config\n");
313 flags |= BTRFS_QGROUP_STATUS_FLAG_INCONSISTENT;
314 }
315 if (!qgroup) {
316 qgroup = add_qgroup_rb(fs_info, found_key.offset);
317 if (IS_ERR(qgroup)) {
318 ret = PTR_ERR(qgroup);
319 goto out;
320 }
321 }
322 switch (found_key.type) {
323 case BTRFS_QGROUP_INFO_KEY: {
324 struct btrfs_qgroup_info_item *ptr;
325
326 ptr = btrfs_item_ptr(l, slot,
327 struct btrfs_qgroup_info_item);
328 qgroup->rfer = btrfs_qgroup_info_rfer(l, ptr);
329 qgroup->rfer_cmpr = btrfs_qgroup_info_rfer_cmpr(l, ptr);
330 qgroup->excl = btrfs_qgroup_info_excl(l, ptr);
331 qgroup->excl_cmpr = btrfs_qgroup_info_excl_cmpr(l, ptr);
332 /* generation currently unused */
333 break;
334 }
335 case BTRFS_QGROUP_LIMIT_KEY: {
336 struct btrfs_qgroup_limit_item *ptr;
337
338 ptr = btrfs_item_ptr(l, slot,
339 struct btrfs_qgroup_limit_item);
340 qgroup->lim_flags = btrfs_qgroup_limit_flags(l, ptr);
341 qgroup->max_rfer = btrfs_qgroup_limit_max_rfer(l, ptr);
342 qgroup->max_excl = btrfs_qgroup_limit_max_excl(l, ptr);
343 qgroup->rsv_rfer = btrfs_qgroup_limit_rsv_rfer(l, ptr);
344 qgroup->rsv_excl = btrfs_qgroup_limit_rsv_excl(l, ptr);
345 break;
346 }
347 }
348 next1:
349 ret = btrfs_next_item(quota_root, path);
350 if (ret < 0)
351 goto out;
352 if (ret)
353 break;
354 }
355 btrfs_release_path(path);
356
357 /*
358 * pass 2: read all qgroup relations
359 */
360 key.objectid = 0;
361 key.type = BTRFS_QGROUP_RELATION_KEY;
362 key.offset = 0;
363 ret = btrfs_search_slot_for_read(quota_root, &key, path, 1, 0);
364 if (ret)
365 goto out;
366 while (1) {
367 slot = path->slots[0];
368 l = path->nodes[0];
369 btrfs_item_key_to_cpu(l, &found_key, slot);
370
371 if (found_key.type != BTRFS_QGROUP_RELATION_KEY)
372 goto next2;
373
374 if (found_key.objectid > found_key.offset) {
375 /* parent <- member, not needed to build config */
376 /* FIXME should we omit the key completely? */
377 goto next2;
378 }
379
380 ret = add_relation_rb(fs_info, found_key.objectid,
381 found_key.offset);
382 if (ret)
383 goto out;
384 next2:
385 ret = btrfs_next_item(quota_root, path);
386 if (ret < 0)
387 goto out;
388 if (ret)
389 break;
390 }
391 out:
392 fs_info->qgroup_flags |= flags;
393 if (!(fs_info->qgroup_flags & BTRFS_QGROUP_STATUS_FLAG_ON)) {
394 fs_info->quota_enabled = 0;
395 fs_info->pending_quota_state = 0;
396 }
397 btrfs_free_path(path);
398
399 return ret < 0 ? ret : 0;
400 }
401
402 /*
403 * This is only called from close_ctree() or open_ctree(), both in single-
404 * treaded paths. Clean up the in-memory structures. No locking needed.
405 */
406 void btrfs_free_qgroup_config(struct btrfs_fs_info *fs_info)
407 {
408 struct rb_node *n;
409 struct btrfs_qgroup *qgroup;
410 struct btrfs_qgroup_list *list;
411
412 while ((n = rb_first(&fs_info->qgroup_tree))) {
413 qgroup = rb_entry(n, struct btrfs_qgroup, node);
414 rb_erase(n, &fs_info->qgroup_tree);
415
416 WARN_ON(!list_empty(&qgroup->dirty));
417
418 while (!list_empty(&qgroup->groups)) {
419 list = list_first_entry(&qgroup->groups,
420 struct btrfs_qgroup_list,
421 next_group);
422 list_del(&list->next_group);
423 list_del(&list->next_member);
424 kfree(list);
425 }
426
427 while (!list_empty(&qgroup->members)) {
428 list = list_first_entry(&qgroup->members,
429 struct btrfs_qgroup_list,
430 next_member);
431 list_del(&list->next_group);
432 list_del(&list->next_member);
433 kfree(list);
434 }
435 kfree(qgroup);
436 }
437 }
438
439 static int add_qgroup_relation_item(struct btrfs_trans_handle *trans,
440 struct btrfs_root *quota_root,
441 u64 src, u64 dst)
442 {
443 int ret;
444 struct btrfs_path *path;
445 struct btrfs_key key;
446
447 path = btrfs_alloc_path();
448 if (!path)
449 return -ENOMEM;
450
451 key.objectid = src;
452 key.type = BTRFS_QGROUP_RELATION_KEY;
453 key.offset = dst;
454
455 ret = btrfs_insert_empty_item(trans, quota_root, path, &key, 0);
456
457 btrfs_mark_buffer_dirty(path->nodes[0]);
458
459 btrfs_free_path(path);
460 return ret;
461 }
462
463 static int del_qgroup_relation_item(struct btrfs_trans_handle *trans,
464 struct btrfs_root *quota_root,
465 u64 src, u64 dst)
466 {
467 int ret;
468 struct btrfs_path *path;
469 struct btrfs_key key;
470
471 path = btrfs_alloc_path();
472 if (!path)
473 return -ENOMEM;
474
475 key.objectid = src;
476 key.type = BTRFS_QGROUP_RELATION_KEY;
477 key.offset = dst;
478
479 ret = btrfs_search_slot(trans, quota_root, &key, path, -1, 1);
480 if (ret < 0)
481 goto out;
482
483 if (ret > 0) {
484 ret = -ENOENT;
485 goto out;
486 }
487
488 ret = btrfs_del_item(trans, quota_root, path);
489 out:
490 btrfs_free_path(path);
491 return ret;
492 }
493
494 static int add_qgroup_item(struct btrfs_trans_handle *trans,
495 struct btrfs_root *quota_root, u64 qgroupid)
496 {
497 int ret;
498 struct btrfs_path *path;
499 struct btrfs_qgroup_info_item *qgroup_info;
500 struct btrfs_qgroup_limit_item *qgroup_limit;
501 struct extent_buffer *leaf;
502 struct btrfs_key key;
503
504 path = btrfs_alloc_path();
505 if (!path)
506 return -ENOMEM;
507
508 key.objectid = 0;
509 key.type = BTRFS_QGROUP_INFO_KEY;
510 key.offset = qgroupid;
511
512 ret = btrfs_insert_empty_item(trans, quota_root, path, &key,
513 sizeof(*qgroup_info));
514 if (ret)
515 goto out;
516
517 leaf = path->nodes[0];
518 qgroup_info = btrfs_item_ptr(leaf, path->slots[0],
519 struct btrfs_qgroup_info_item);
520 btrfs_set_qgroup_info_generation(leaf, qgroup_info, trans->transid);
521 btrfs_set_qgroup_info_rfer(leaf, qgroup_info, 0);
522 btrfs_set_qgroup_info_rfer_cmpr(leaf, qgroup_info, 0);
523 btrfs_set_qgroup_info_excl(leaf, qgroup_info, 0);
524 btrfs_set_qgroup_info_excl_cmpr(leaf, qgroup_info, 0);
525
526 btrfs_mark_buffer_dirty(leaf);
527
528 btrfs_release_path(path);
529
530 key.type = BTRFS_QGROUP_LIMIT_KEY;
531 ret = btrfs_insert_empty_item(trans, quota_root, path, &key,
532 sizeof(*qgroup_limit));
533 if (ret)
534 goto out;
535
536 leaf = path->nodes[0];
537 qgroup_limit = btrfs_item_ptr(leaf, path->slots[0],
538 struct btrfs_qgroup_limit_item);
539 btrfs_set_qgroup_limit_flags(leaf, qgroup_limit, 0);
540 btrfs_set_qgroup_limit_max_rfer(leaf, qgroup_limit, 0);
541 btrfs_set_qgroup_limit_max_excl(leaf, qgroup_limit, 0);
542 btrfs_set_qgroup_limit_rsv_rfer(leaf, qgroup_limit, 0);
543 btrfs_set_qgroup_limit_rsv_excl(leaf, qgroup_limit, 0);
544
545 btrfs_mark_buffer_dirty(leaf);
546
547 ret = 0;
548 out:
549 btrfs_free_path(path);
550 return ret;
551 }
552
553 static int del_qgroup_item(struct btrfs_trans_handle *trans,
554 struct btrfs_root *quota_root, u64 qgroupid)
555 {
556 int ret;
557 struct btrfs_path *path;
558 struct btrfs_key key;
559
560 path = btrfs_alloc_path();
561 if (!path)
562 return -ENOMEM;
563
564 key.objectid = 0;
565 key.type = BTRFS_QGROUP_INFO_KEY;
566 key.offset = qgroupid;
567 ret = btrfs_search_slot(trans, quota_root, &key, path, -1, 1);
568 if (ret < 0)
569 goto out;
570
571 if (ret > 0) {
572 ret = -ENOENT;
573 goto out;
574 }
575
576 ret = btrfs_del_item(trans, quota_root, path);
577 if (ret)
578 goto out;
579
580 btrfs_release_path(path);
581
582 key.type = BTRFS_QGROUP_LIMIT_KEY;
583 ret = btrfs_search_slot(trans, quota_root, &key, path, -1, 1);
584 if (ret < 0)
585 goto out;
586
587 if (ret > 0) {
588 ret = -ENOENT;
589 goto out;
590 }
591
592 ret = btrfs_del_item(trans, quota_root, path);
593
594 out:
595 btrfs_free_path(path);
596 return ret;
597 }
598
599 static int update_qgroup_limit_item(struct btrfs_trans_handle *trans,
600 struct btrfs_root *root, u64 qgroupid,
601 u64 flags, u64 max_rfer, u64 max_excl,
602 u64 rsv_rfer, u64 rsv_excl)
603 {
604 struct btrfs_path *path;
605 struct btrfs_key key;
606 struct extent_buffer *l;
607 struct btrfs_qgroup_limit_item *qgroup_limit;
608 int ret;
609 int slot;
610
611 key.objectid = 0;
612 key.type = BTRFS_QGROUP_LIMIT_KEY;
613 key.offset = qgroupid;
614
615 path = btrfs_alloc_path();
616 BUG_ON(!path);
617 ret = btrfs_search_slot(trans, root, &key, path, 0, 1);
618 if (ret > 0)
619 ret = -ENOENT;
620
621 if (ret)
622 goto out;
623
624 l = path->nodes[0];
625 slot = path->slots[0];
626 qgroup_limit = btrfs_item_ptr(l, path->slots[0],
627 struct btrfs_qgroup_limit_item);
628 btrfs_set_qgroup_limit_flags(l, qgroup_limit, flags);
629 btrfs_set_qgroup_limit_max_rfer(l, qgroup_limit, max_rfer);
630 btrfs_set_qgroup_limit_max_excl(l, qgroup_limit, max_excl);
631 btrfs_set_qgroup_limit_rsv_rfer(l, qgroup_limit, rsv_rfer);
632 btrfs_set_qgroup_limit_rsv_excl(l, qgroup_limit, rsv_excl);
633
634 btrfs_mark_buffer_dirty(l);
635
636 out:
637 btrfs_free_path(path);
638 return ret;
639 }
640
641 static int update_qgroup_info_item(struct btrfs_trans_handle *trans,
642 struct btrfs_root *root,
643 struct btrfs_qgroup *qgroup)
644 {
645 struct btrfs_path *path;
646 struct btrfs_key key;
647 struct extent_buffer *l;
648 struct btrfs_qgroup_info_item *qgroup_info;
649 int ret;
650 int slot;
651
652 key.objectid = 0;
653 key.type = BTRFS_QGROUP_INFO_KEY;
654 key.offset = qgroup->qgroupid;
655
656 path = btrfs_alloc_path();
657 BUG_ON(!path);
658 ret = btrfs_search_slot(trans, root, &key, path, 0, 1);
659 if (ret > 0)
660 ret = -ENOENT;
661
662 if (ret)
663 goto out;
664
665 l = path->nodes[0];
666 slot = path->slots[0];
667 qgroup_info = btrfs_item_ptr(l, path->slots[0],
668 struct btrfs_qgroup_info_item);
669 btrfs_set_qgroup_info_generation(l, qgroup_info, trans->transid);
670 btrfs_set_qgroup_info_rfer(l, qgroup_info, qgroup->rfer);
671 btrfs_set_qgroup_info_rfer_cmpr(l, qgroup_info, qgroup->rfer_cmpr);
672 btrfs_set_qgroup_info_excl(l, qgroup_info, qgroup->excl);
673 btrfs_set_qgroup_info_excl_cmpr(l, qgroup_info, qgroup->excl_cmpr);
674
675 btrfs_mark_buffer_dirty(l);
676
677 out:
678 btrfs_free_path(path);
679 return ret;
680 }
681
682 static int update_qgroup_status_item(struct btrfs_trans_handle *trans,
683 struct btrfs_fs_info *fs_info,
684 struct btrfs_root *root)
685 {
686 struct btrfs_path *path;
687 struct btrfs_key key;
688 struct extent_buffer *l;
689 struct btrfs_qgroup_status_item *ptr;
690 int ret;
691 int slot;
692
693 key.objectid = 0;
694 key.type = BTRFS_QGROUP_STATUS_KEY;
695 key.offset = 0;
696
697 path = btrfs_alloc_path();
698 BUG_ON(!path);
699 ret = btrfs_search_slot(trans, root, &key, path, 0, 1);
700 if (ret > 0)
701 ret = -ENOENT;
702
703 if (ret)
704 goto out;
705
706 l = path->nodes[0];
707 slot = path->slots[0];
708 ptr = btrfs_item_ptr(l, slot, struct btrfs_qgroup_status_item);
709 btrfs_set_qgroup_status_flags(l, ptr, fs_info->qgroup_flags);
710 btrfs_set_qgroup_status_generation(l, ptr, trans->transid);
711 /* XXX scan */
712
713 btrfs_mark_buffer_dirty(l);
714
715 out:
716 btrfs_free_path(path);
717 return ret;
718 }
719
720 /*
721 * called with qgroup_lock held
722 */
723 static int btrfs_clean_quota_tree(struct btrfs_trans_handle *trans,
724 struct btrfs_root *root)
725 {
726 struct btrfs_path *path;
727 struct btrfs_key key;
728 int ret;
729
730 if (!root)
731 return -EINVAL;
732
733 path = btrfs_alloc_path();
734 if (!path)
735 return -ENOMEM;
736
737 while (1) {
738 key.objectid = 0;
739 key.offset = 0;
740 key.type = 0;
741
742 path->leave_spinning = 1;
743 ret = btrfs_search_slot(trans, root, &key, path, -1, 1);
744 if (ret > 0) {
745 if (path->slots[0] == 0)
746 break;
747 path->slots[0]--;
748 } else if (ret < 0) {
749 break;
750 }
751
752 ret = btrfs_del_item(trans, root, path);
753 if (ret)
754 goto out;
755 btrfs_release_path(path);
756 }
757 ret = 0;
758 out:
759 root->fs_info->pending_quota_state = 0;
760 btrfs_free_path(path);
761 return ret;
762 }
763
764 int btrfs_quota_enable(struct btrfs_trans_handle *trans,
765 struct btrfs_fs_info *fs_info)
766 {
767 struct btrfs_root *quota_root;
768 struct btrfs_path *path = NULL;
769 struct btrfs_qgroup_status_item *ptr;
770 struct extent_buffer *leaf;
771 struct btrfs_key key;
772 int ret = 0;
773
774 spin_lock(&fs_info->qgroup_lock);
775 if (fs_info->quota_root) {
776 fs_info->pending_quota_state = 1;
777 spin_unlock(&fs_info->qgroup_lock);
778 goto out;
779 }
780 spin_unlock(&fs_info->qgroup_lock);
781
782 /*
783 * initially create the quota tree
784 */
785 quota_root = btrfs_create_tree(trans, fs_info,
786 BTRFS_QUOTA_TREE_OBJECTID);
787 if (IS_ERR(quota_root)) {
788 ret = PTR_ERR(quota_root);
789 goto out;
790 }
791
792 path = btrfs_alloc_path();
793 if (!path)
794 return -ENOMEM;
795
796 key.objectid = 0;
797 key.type = BTRFS_QGROUP_STATUS_KEY;
798 key.offset = 0;
799
800 ret = btrfs_insert_empty_item(trans, quota_root, path, &key,
801 sizeof(*ptr));
802 if (ret)
803 goto out;
804
805 leaf = path->nodes[0];
806 ptr = btrfs_item_ptr(leaf, path->slots[0],
807 struct btrfs_qgroup_status_item);
808 btrfs_set_qgroup_status_generation(leaf, ptr, trans->transid);
809 btrfs_set_qgroup_status_version(leaf, ptr, BTRFS_QGROUP_STATUS_VERSION);
810 fs_info->qgroup_flags = BTRFS_QGROUP_STATUS_FLAG_ON |
811 BTRFS_QGROUP_STATUS_FLAG_INCONSISTENT;
812 btrfs_set_qgroup_status_flags(leaf, ptr, fs_info->qgroup_flags);
813 btrfs_set_qgroup_status_scan(leaf, ptr, 0);
814
815 btrfs_mark_buffer_dirty(leaf);
816
817 spin_lock(&fs_info->qgroup_lock);
818 fs_info->quota_root = quota_root;
819 fs_info->pending_quota_state = 1;
820 spin_unlock(&fs_info->qgroup_lock);
821 out:
822 btrfs_free_path(path);
823 return ret;
824 }
825
826 int btrfs_quota_disable(struct btrfs_trans_handle *trans,
827 struct btrfs_fs_info *fs_info)
828 {
829 struct btrfs_root *tree_root = fs_info->tree_root;
830 struct btrfs_root *quota_root;
831 int ret = 0;
832
833 spin_lock(&fs_info->qgroup_lock);
834 fs_info->quota_enabled = 0;
835 fs_info->pending_quota_state = 0;
836 quota_root = fs_info->quota_root;
837 fs_info->quota_root = NULL;
838 btrfs_free_qgroup_config(fs_info);
839 spin_unlock(&fs_info->qgroup_lock);
840
841 if (!quota_root)
842 return -EINVAL;
843
844 ret = btrfs_clean_quota_tree(trans, quota_root);
845 if (ret)
846 goto out;
847
848 ret = btrfs_del_root(trans, tree_root, &quota_root->root_key);
849 if (ret)
850 goto out;
851
852 list_del(&quota_root->dirty_list);
853
854 btrfs_tree_lock(quota_root->node);
855 clean_tree_block(trans, tree_root, quota_root->node);
856 btrfs_tree_unlock(quota_root->node);
857 btrfs_free_tree_block(trans, quota_root, quota_root->node, 0, 1);
858
859 free_extent_buffer(quota_root->node);
860 free_extent_buffer(quota_root->commit_root);
861 kfree(quota_root);
862 out:
863 return ret;
864 }
865
866 int btrfs_quota_rescan(struct btrfs_fs_info *fs_info)
867 {
868 /* FIXME */
869 return 0;
870 }
871
872 int btrfs_add_qgroup_relation(struct btrfs_trans_handle *trans,
873 struct btrfs_fs_info *fs_info, u64 src, u64 dst)
874 {
875 struct btrfs_root *quota_root;
876 int ret = 0;
877
878 quota_root = fs_info->quota_root;
879 if (!quota_root)
880 return -EINVAL;
881
882 ret = add_qgroup_relation_item(trans, quota_root, src, dst);
883 if (ret)
884 return ret;
885
886 ret = add_qgroup_relation_item(trans, quota_root, dst, src);
887 if (ret) {
888 del_qgroup_relation_item(trans, quota_root, src, dst);
889 return ret;
890 }
891
892 spin_lock(&fs_info->qgroup_lock);
893 ret = add_relation_rb(quota_root->fs_info, src, dst);
894 spin_unlock(&fs_info->qgroup_lock);
895
896 return ret;
897 }
898
899 int btrfs_del_qgroup_relation(struct btrfs_trans_handle *trans,
900 struct btrfs_fs_info *fs_info, u64 src, u64 dst)
901 {
902 struct btrfs_root *quota_root;
903 int ret = 0;
904 int err;
905
906 quota_root = fs_info->quota_root;
907 if (!quota_root)
908 return -EINVAL;
909
910 ret = del_qgroup_relation_item(trans, quota_root, src, dst);
911 err = del_qgroup_relation_item(trans, quota_root, dst, src);
912 if (err && !ret)
913 ret = err;
914
915 spin_lock(&fs_info->qgroup_lock);
916 del_relation_rb(fs_info, src, dst);
917
918 spin_unlock(&fs_info->qgroup_lock);
919
920 return ret;
921 }
922
923 int btrfs_create_qgroup(struct btrfs_trans_handle *trans,
924 struct btrfs_fs_info *fs_info, u64 qgroupid, char *name)
925 {
926 struct btrfs_root *quota_root;
927 struct btrfs_qgroup *qgroup;
928 int ret = 0;
929
930 quota_root = fs_info->quota_root;
931 if (!quota_root)
932 return -EINVAL;
933
934 ret = add_qgroup_item(trans, quota_root, qgroupid);
935
936 spin_lock(&fs_info->qgroup_lock);
937 qgroup = add_qgroup_rb(fs_info, qgroupid);
938 spin_unlock(&fs_info->qgroup_lock);
939
940 if (IS_ERR(qgroup))
941 ret = PTR_ERR(qgroup);
942
943 return ret;
944 }
945
946 int btrfs_remove_qgroup(struct btrfs_trans_handle *trans,
947 struct btrfs_fs_info *fs_info, u64 qgroupid)
948 {
949 struct btrfs_root *quota_root;
950 int ret = 0;
951
952 quota_root = fs_info->quota_root;
953 if (!quota_root)
954 return -EINVAL;
955
956 ret = del_qgroup_item(trans, quota_root, qgroupid);
957
958 spin_lock(&fs_info->qgroup_lock);
959 del_qgroup_rb(quota_root->fs_info, qgroupid);
960
961 spin_unlock(&fs_info->qgroup_lock);
962
963 return ret;
964 }
965
966 int btrfs_limit_qgroup(struct btrfs_trans_handle *trans,
967 struct btrfs_fs_info *fs_info, u64 qgroupid,
968 struct btrfs_qgroup_limit *limit)
969 {
970 struct btrfs_root *quota_root = fs_info->quota_root;
971 struct btrfs_qgroup *qgroup;
972 int ret = 0;
973
974 if (!quota_root)
975 return -EINVAL;
976
977 ret = update_qgroup_limit_item(trans, quota_root, qgroupid,
978 limit->flags, limit->max_rfer,
979 limit->max_excl, limit->rsv_rfer,
980 limit->rsv_excl);
981 if (ret) {
982 fs_info->qgroup_flags |= BTRFS_QGROUP_STATUS_FLAG_INCONSISTENT;
983 printk(KERN_INFO "unable to update quota limit for %llu\n",
984 (unsigned long long)qgroupid);
985 }
986
987 spin_lock(&fs_info->qgroup_lock);
988
989 qgroup = find_qgroup_rb(fs_info, qgroupid);
990 if (!qgroup) {
991 ret = -ENOENT;
992 goto unlock;
993 }
994 qgroup->lim_flags = limit->flags;
995 qgroup->max_rfer = limit->max_rfer;
996 qgroup->max_excl = limit->max_excl;
997 qgroup->rsv_rfer = limit->rsv_rfer;
998 qgroup->rsv_excl = limit->rsv_excl;
999
1000 unlock:
1001 spin_unlock(&fs_info->qgroup_lock);
1002
1003 return ret;
1004 }
1005
1006 static void qgroup_dirty(struct btrfs_fs_info *fs_info,
1007 struct btrfs_qgroup *qgroup)
1008 {
1009 if (list_empty(&qgroup->dirty))
1010 list_add(&qgroup->dirty, &fs_info->dirty_qgroups);
1011 }
1012
1013 /*
1014 * btrfs_qgroup_record_ref is called when the ref is added or deleted. it puts
1015 * the modification into a list that's later used by btrfs_end_transaction to
1016 * pass the recorded modifications on to btrfs_qgroup_account_ref.
1017 */
1018 int btrfs_qgroup_record_ref(struct btrfs_trans_handle *trans,
1019 struct btrfs_delayed_ref_node *node,
1020 struct btrfs_delayed_extent_op *extent_op)
1021 {
1022 struct qgroup_update *u;
1023
1024 BUG_ON(!trans->delayed_ref_elem.seq);
1025 u = kmalloc(sizeof(*u), GFP_NOFS);
1026 if (!u)
1027 return -ENOMEM;
1028
1029 u->node = node;
1030 u->extent_op = extent_op;
1031 list_add_tail(&u->list, &trans->qgroup_ref_list);
1032
1033 return 0;
1034 }
1035
1036 /*
1037 * btrfs_qgroup_account_ref is called for every ref that is added to or deleted
1038 * from the fs. First, all roots referencing the extent are searched, and
1039 * then the space is accounted accordingly to the different roots. The
1040 * accounting algorithm works in 3 steps documented inline.
1041 */
1042 int btrfs_qgroup_account_ref(struct btrfs_trans_handle *trans,
1043 struct btrfs_fs_info *fs_info,
1044 struct btrfs_delayed_ref_node *node,
1045 struct btrfs_delayed_extent_op *extent_op)
1046 {
1047 struct btrfs_key ins;
1048 struct btrfs_root *quota_root;
1049 u64 ref_root;
1050 struct btrfs_qgroup *qgroup;
1051 struct ulist_node *unode;
1052 struct ulist *roots = NULL;
1053 struct ulist *tmp = NULL;
1054 struct ulist_iterator uiter;
1055 u64 seq;
1056 int ret = 0;
1057 int sgn;
1058
1059 if (!fs_info->quota_enabled)
1060 return 0;
1061
1062 BUG_ON(!fs_info->quota_root);
1063
1064 ins.objectid = node->bytenr;
1065 ins.offset = node->num_bytes;
1066 ins.type = BTRFS_EXTENT_ITEM_KEY;
1067
1068 if (node->type == BTRFS_TREE_BLOCK_REF_KEY ||
1069 node->type == BTRFS_SHARED_BLOCK_REF_KEY) {
1070 struct btrfs_delayed_tree_ref *ref;
1071 ref = btrfs_delayed_node_to_tree_ref(node);
1072 ref_root = ref->root;
1073 } else if (node->type == BTRFS_EXTENT_DATA_REF_KEY ||
1074 node->type == BTRFS_SHARED_DATA_REF_KEY) {
1075 struct btrfs_delayed_data_ref *ref;
1076 ref = btrfs_delayed_node_to_data_ref(node);
1077 ref_root = ref->root;
1078 } else {
1079 BUG();
1080 }
1081
1082 if (!is_fstree(ref_root)) {
1083 /*
1084 * non-fs-trees are not being accounted
1085 */
1086 return 0;
1087 }
1088
1089 switch (node->action) {
1090 case BTRFS_ADD_DELAYED_REF:
1091 case BTRFS_ADD_DELAYED_EXTENT:
1092 sgn = 1;
1093 break;
1094 case BTRFS_DROP_DELAYED_REF:
1095 sgn = -1;
1096 break;
1097 case BTRFS_UPDATE_DELAYED_HEAD:
1098 return 0;
1099 default:
1100 BUG();
1101 }
1102
1103 /*
1104 * the delayed ref sequence number we pass depends on the direction of
1105 * the operation. for add operations, we pass (node->seq - 1) to skip
1106 * the delayed ref's current sequence number, because we need the state
1107 * of the tree before the add operation. for delete operations, we pass
1108 * (node->seq) to include the delayed ref's current sequence number,
1109 * because we need the state of the tree after the delete operation.
1110 */
1111 ret = btrfs_find_all_roots(trans, fs_info, node->bytenr,
1112 sgn > 0 ? node->seq - 1 : node->seq, &roots);
1113 if (ret < 0)
1114 goto out;
1115
1116 spin_lock(&fs_info->qgroup_lock);
1117 quota_root = fs_info->quota_root;
1118 if (!quota_root)
1119 goto unlock;
1120
1121 qgroup = find_qgroup_rb(fs_info, ref_root);
1122 if (!qgroup)
1123 goto unlock;
1124
1125 /*
1126 * step 1: for each old ref, visit all nodes once and inc refcnt
1127 */
1128 tmp = ulist_alloc(GFP_ATOMIC);
1129 if (!tmp) {
1130 ret = -ENOMEM;
1131 goto unlock;
1132 }
1133 seq = fs_info->qgroup_seq;
1134 fs_info->qgroup_seq += roots->nnodes + 1; /* max refcnt */
1135
1136 ULIST_ITER_INIT(&uiter);
1137 while ((unode = ulist_next(roots, &uiter))) {
1138 struct ulist_node *tmp_unode;
1139 struct ulist_iterator tmp_uiter;
1140 struct btrfs_qgroup *qg;
1141
1142 qg = find_qgroup_rb(fs_info, unode->val);
1143 if (!qg)
1144 continue;
1145
1146 ulist_reinit(tmp);
1147 /* XXX id not needed */
1148 ulist_add(tmp, qg->qgroupid, (unsigned long)qg, GFP_ATOMIC);
1149 ULIST_ITER_INIT(&tmp_uiter);
1150 while ((tmp_unode = ulist_next(tmp, &tmp_uiter))) {
1151 struct btrfs_qgroup_list *glist;
1152
1153 qg = (struct btrfs_qgroup *)tmp_unode->aux;
1154 if (qg->refcnt < seq)
1155 qg->refcnt = seq + 1;
1156 else
1157 ++qg->refcnt;
1158
1159 list_for_each_entry(glist, &qg->groups, next_group) {
1160 ulist_add(tmp, glist->group->qgroupid,
1161 (unsigned long)glist->group,
1162 GFP_ATOMIC);
1163 }
1164 }
1165 }
1166
1167 /*
1168 * step 2: walk from the new root
1169 */
1170 ulist_reinit(tmp);
1171 ulist_add(tmp, qgroup->qgroupid, (unsigned long)qgroup, GFP_ATOMIC);
1172 ULIST_ITER_INIT(&uiter);
1173 while ((unode = ulist_next(tmp, &uiter))) {
1174 struct btrfs_qgroup *qg;
1175 struct btrfs_qgroup_list *glist;
1176
1177 qg = (struct btrfs_qgroup *)unode->aux;
1178 if (qg->refcnt < seq) {
1179 /* not visited by step 1 */
1180 qg->rfer += sgn * node->num_bytes;
1181 qg->rfer_cmpr += sgn * node->num_bytes;
1182 if (roots->nnodes == 0) {
1183 qg->excl += sgn * node->num_bytes;
1184 qg->excl_cmpr += sgn * node->num_bytes;
1185 }
1186 qgroup_dirty(fs_info, qg);
1187 }
1188 WARN_ON(qg->tag >= seq);
1189 qg->tag = seq;
1190
1191 list_for_each_entry(glist, &qg->groups, next_group) {
1192 ulist_add(tmp, glist->group->qgroupid,
1193 (unsigned long)glist->group, GFP_ATOMIC);
1194 }
1195 }
1196
1197 /*
1198 * step 3: walk again from old refs
1199 */
1200 ULIST_ITER_INIT(&uiter);
1201 while ((unode = ulist_next(roots, &uiter))) {
1202 struct btrfs_qgroup *qg;
1203 struct ulist_node *tmp_unode;
1204 struct ulist_iterator tmp_uiter;
1205
1206 qg = find_qgroup_rb(fs_info, unode->val);
1207 if (!qg)
1208 continue;
1209
1210 ulist_reinit(tmp);
1211 ulist_add(tmp, qg->qgroupid, (unsigned long)qg, GFP_ATOMIC);
1212 ULIST_ITER_INIT(&tmp_uiter);
1213 while ((tmp_unode = ulist_next(tmp, &tmp_uiter))) {
1214 struct btrfs_qgroup_list *glist;
1215
1216 qg = (struct btrfs_qgroup *)tmp_unode->aux;
1217 if (qg->tag == seq)
1218 continue;
1219
1220 if (qg->refcnt - seq == roots->nnodes) {
1221 qg->excl -= sgn * node->num_bytes;
1222 qg->excl_cmpr -= sgn * node->num_bytes;
1223 qgroup_dirty(fs_info, qg);
1224 }
1225
1226 list_for_each_entry(glist, &qg->groups, next_group) {
1227 ulist_add(tmp, glist->group->qgroupid,
1228 (unsigned long)glist->group,
1229 GFP_ATOMIC);
1230 }
1231 }
1232 }
1233 ret = 0;
1234 unlock:
1235 spin_unlock(&fs_info->qgroup_lock);
1236 out:
1237 ulist_free(roots);
1238 ulist_free(tmp);
1239
1240 return ret;
1241 }
1242
1243 /*
1244 * called from commit_transaction. Writes all changed qgroups to disk.
1245 */
1246 int btrfs_run_qgroups(struct btrfs_trans_handle *trans,
1247 struct btrfs_fs_info *fs_info)
1248 {
1249 struct btrfs_root *quota_root = fs_info->quota_root;
1250 int ret = 0;
1251
1252 if (!quota_root)
1253 goto out;
1254
1255 fs_info->quota_enabled = fs_info->pending_quota_state;
1256
1257 spin_lock(&fs_info->qgroup_lock);
1258 while (!list_empty(&fs_info->dirty_qgroups)) {
1259 struct btrfs_qgroup *qgroup;
1260 qgroup = list_first_entry(&fs_info->dirty_qgroups,
1261 struct btrfs_qgroup, dirty);
1262 list_del_init(&qgroup->dirty);
1263 spin_unlock(&fs_info->qgroup_lock);
1264 ret = update_qgroup_info_item(trans, quota_root, qgroup);
1265 if (ret)
1266 fs_info->qgroup_flags |=
1267 BTRFS_QGROUP_STATUS_FLAG_INCONSISTENT;
1268 spin_lock(&fs_info->qgroup_lock);
1269 }
1270 if (fs_info->quota_enabled)
1271 fs_info->qgroup_flags |= BTRFS_QGROUP_STATUS_FLAG_ON;
1272 else
1273 fs_info->qgroup_flags &= ~BTRFS_QGROUP_STATUS_FLAG_ON;
1274 spin_unlock(&fs_info->qgroup_lock);
1275
1276 ret = update_qgroup_status_item(trans, fs_info, quota_root);
1277 if (ret)
1278 fs_info->qgroup_flags |= BTRFS_QGROUP_STATUS_FLAG_INCONSISTENT;
1279
1280 out:
1281
1282 return ret;
1283 }
1284
1285 /*
1286 * copy the acounting information between qgroups. This is necessary when a
1287 * snapshot or a subvolume is created
1288 */
1289 int btrfs_qgroup_inherit(struct btrfs_trans_handle *trans,
1290 struct btrfs_fs_info *fs_info, u64 srcid, u64 objectid,
1291 struct btrfs_qgroup_inherit *inherit)
1292 {
1293 int ret = 0;
1294 int i;
1295 u64 *i_qgroups;
1296 struct btrfs_root *quota_root = fs_info->quota_root;
1297 struct btrfs_qgroup *srcgroup;
1298 struct btrfs_qgroup *dstgroup;
1299 u32 level_size = 0;
1300
1301 if (!fs_info->quota_enabled)
1302 return 0;
1303
1304 if (!quota_root)
1305 return -EINVAL;
1306
1307 /*
1308 * create a tracking group for the subvol itself
1309 */
1310 ret = add_qgroup_item(trans, quota_root, objectid);
1311 if (ret)
1312 goto out;
1313
1314 if (inherit && inherit->flags & BTRFS_QGROUP_INHERIT_SET_LIMITS) {
1315 ret = update_qgroup_limit_item(trans, quota_root, objectid,
1316 inherit->lim.flags,
1317 inherit->lim.max_rfer,
1318 inherit->lim.max_excl,
1319 inherit->lim.rsv_rfer,
1320 inherit->lim.rsv_excl);
1321 if (ret)
1322 goto out;
1323 }
1324
1325 if (srcid) {
1326 struct btrfs_root *srcroot;
1327 struct btrfs_key srckey;
1328 int srcroot_level;
1329
1330 srckey.objectid = srcid;
1331 srckey.type = BTRFS_ROOT_ITEM_KEY;
1332 srckey.offset = (u64)-1;
1333 srcroot = btrfs_read_fs_root_no_name(fs_info, &srckey);
1334 if (IS_ERR(srcroot)) {
1335 ret = PTR_ERR(srcroot);
1336 goto out;
1337 }
1338
1339 rcu_read_lock();
1340 srcroot_level = btrfs_header_level(srcroot->node);
1341 level_size = btrfs_level_size(srcroot, srcroot_level);
1342 rcu_read_unlock();
1343 }
1344
1345 /*
1346 * add qgroup to all inherited groups
1347 */
1348 if (inherit) {
1349 i_qgroups = (u64 *)(inherit + 1);
1350 for (i = 0; i < inherit->num_qgroups; ++i) {
1351 ret = add_qgroup_relation_item(trans, quota_root,
1352 objectid, *i_qgroups);
1353 if (ret)
1354 goto out;
1355 ret = add_qgroup_relation_item(trans, quota_root,
1356 *i_qgroups, objectid);
1357 if (ret)
1358 goto out;
1359 ++i_qgroups;
1360 }
1361 }
1362
1363
1364 spin_lock(&fs_info->qgroup_lock);
1365
1366 dstgroup = add_qgroup_rb(fs_info, objectid);
1367 if (IS_ERR(dstgroup)) {
1368 ret = PTR_ERR(dstgroup);
1369 goto unlock;
1370 }
1371
1372 if (srcid) {
1373 srcgroup = find_qgroup_rb(fs_info, srcid);
1374 if (!srcgroup) {
1375 ret = -EINVAL;
1376 goto unlock;
1377 }
1378 dstgroup->rfer = srcgroup->rfer - level_size;
1379 dstgroup->rfer_cmpr = srcgroup->rfer_cmpr - level_size;
1380 srcgroup->excl = level_size;
1381 srcgroup->excl_cmpr = level_size;
1382 qgroup_dirty(fs_info, dstgroup);
1383 qgroup_dirty(fs_info, srcgroup);
1384 }
1385
1386 if (!inherit) {
1387 ret = -EINVAL;
1388 goto unlock;
1389 }
1390
1391 i_qgroups = (u64 *)(inherit + 1);
1392 for (i = 0; i < inherit->num_qgroups; ++i) {
1393 ret = add_relation_rb(quota_root->fs_info, objectid,
1394 *i_qgroups);
1395 if (ret)
1396 goto unlock;
1397 ++i_qgroups;
1398 }
1399
1400 for (i = 0; i < inherit->num_ref_copies; ++i) {
1401 struct btrfs_qgroup *src;
1402 struct btrfs_qgroup *dst;
1403
1404 src = find_qgroup_rb(fs_info, i_qgroups[0]);
1405 dst = find_qgroup_rb(fs_info, i_qgroups[1]);
1406
1407 if (!src || !dst) {
1408 ret = -EINVAL;
1409 goto unlock;
1410 }
1411
1412 dst->rfer = src->rfer - level_size;
1413 dst->rfer_cmpr = src->rfer_cmpr - level_size;
1414 i_qgroups += 2;
1415 }
1416 for (i = 0; i < inherit->num_excl_copies; ++i) {
1417 struct btrfs_qgroup *src;
1418 struct btrfs_qgroup *dst;
1419
1420 src = find_qgroup_rb(fs_info, i_qgroups[0]);
1421 dst = find_qgroup_rb(fs_info, i_qgroups[1]);
1422
1423 if (!src || !dst) {
1424 ret = -EINVAL;
1425 goto unlock;
1426 }
1427
1428 dst->excl = src->excl + level_size;
1429 dst->excl_cmpr = src->excl_cmpr + level_size;
1430 i_qgroups += 2;
1431 }
1432
1433 unlock:
1434 spin_unlock(&fs_info->qgroup_lock);
1435 out:
1436 return ret;
1437 }
1438
1439 /*
1440 * reserve some space for a qgroup and all its parents. The reservation takes
1441 * place with start_transaction or dealloc_reserve, similar to ENOSPC
1442 * accounting. If not enough space is available, EDQUOT is returned.
1443 * We assume that the requested space is new for all qgroups.
1444 */
1445 int btrfs_qgroup_reserve(struct btrfs_root *root, u64 num_bytes)
1446 {
1447 struct btrfs_root *quota_root;
1448 struct btrfs_qgroup *qgroup;
1449 struct btrfs_fs_info *fs_info = root->fs_info;
1450 u64 ref_root = root->root_key.objectid;
1451 int ret = 0;
1452 struct ulist *ulist = NULL;
1453 struct ulist_node *unode;
1454 struct ulist_iterator uiter;
1455
1456 if (!is_fstree(ref_root))
1457 return 0;
1458
1459 if (num_bytes == 0)
1460 return 0;
1461
1462 spin_lock(&fs_info->qgroup_lock);
1463 quota_root = fs_info->quota_root;
1464 if (!quota_root)
1465 goto out;
1466
1467 qgroup = find_qgroup_rb(fs_info, ref_root);
1468 if (!qgroup)
1469 goto out;
1470
1471 /*
1472 * in a first step, we check all affected qgroups if any limits would
1473 * be exceeded
1474 */
1475 ulist = ulist_alloc(GFP_ATOMIC);
1476 ulist_add(ulist, qgroup->qgroupid, (unsigned long)qgroup, GFP_ATOMIC);
1477 ULIST_ITER_INIT(&uiter);
1478 while ((unode = ulist_next(ulist, &uiter))) {
1479 struct btrfs_qgroup *qg;
1480 struct btrfs_qgroup_list *glist;
1481
1482 qg = (struct btrfs_qgroup *)unode->aux;
1483
1484 if ((qg->lim_flags & BTRFS_QGROUP_LIMIT_MAX_RFER) &&
1485 qg->reserved + qg->rfer + num_bytes >
1486 qg->max_rfer)
1487 ret = -EDQUOT;
1488
1489 if ((qg->lim_flags & BTRFS_QGROUP_LIMIT_MAX_EXCL) &&
1490 qg->reserved + qg->excl + num_bytes >
1491 qg->max_excl)
1492 ret = -EDQUOT;
1493
1494 list_for_each_entry(glist, &qg->groups, next_group) {
1495 ulist_add(ulist, glist->group->qgroupid,
1496 (unsigned long)glist->group, GFP_ATOMIC);
1497 }
1498 }
1499 if (ret)
1500 goto out;
1501
1502 /*
1503 * no limits exceeded, now record the reservation into all qgroups
1504 */
1505 ULIST_ITER_INIT(&uiter);
1506 while ((unode = ulist_next(ulist, &uiter))) {
1507 struct btrfs_qgroup *qg;
1508
1509 qg = (struct btrfs_qgroup *)unode->aux;
1510
1511 qg->reserved += num_bytes;
1512 }
1513
1514 out:
1515 spin_unlock(&fs_info->qgroup_lock);
1516 ulist_free(ulist);
1517
1518 return ret;
1519 }
1520
1521 void btrfs_qgroup_free(struct btrfs_root *root, u64 num_bytes)
1522 {
1523 struct btrfs_root *quota_root;
1524 struct btrfs_qgroup *qgroup;
1525 struct btrfs_fs_info *fs_info = root->fs_info;
1526 struct ulist *ulist = NULL;
1527 struct ulist_node *unode;
1528 struct ulist_iterator uiter;
1529 u64 ref_root = root->root_key.objectid;
1530
1531 if (!is_fstree(ref_root))
1532 return;
1533
1534 if (num_bytes == 0)
1535 return;
1536
1537 spin_lock(&fs_info->qgroup_lock);
1538
1539 quota_root = fs_info->quota_root;
1540 if (!quota_root)
1541 goto out;
1542
1543 qgroup = find_qgroup_rb(fs_info, ref_root);
1544 if (!qgroup)
1545 goto out;
1546
1547 ulist = ulist_alloc(GFP_ATOMIC);
1548 ulist_add(ulist, qgroup->qgroupid, (unsigned long)qgroup, GFP_ATOMIC);
1549 ULIST_ITER_INIT(&uiter);
1550 while ((unode = ulist_next(ulist, &uiter))) {
1551 struct btrfs_qgroup *qg;
1552 struct btrfs_qgroup_list *glist;
1553
1554 qg = (struct btrfs_qgroup *)unode->aux;
1555
1556 qg->reserved -= num_bytes;
1557
1558 list_for_each_entry(glist, &qg->groups, next_group) {
1559 ulist_add(ulist, glist->group->qgroupid,
1560 (unsigned long)glist->group, GFP_ATOMIC);
1561 }
1562 }
1563
1564 out:
1565 spin_unlock(&fs_info->qgroup_lock);
1566 ulist_free(ulist);
1567 }
1568
1569 void assert_qgroups_uptodate(struct btrfs_trans_handle *trans)
1570 {
1571 if (list_empty(&trans->qgroup_ref_list) && !trans->delayed_ref_elem.seq)
1572 return;
1573 printk(KERN_ERR "btrfs: qgroups not uptodate in trans handle %p: list is%s empty, seq is %llu\n",
1574 trans, list_empty(&trans->qgroup_ref_list) ? "" : " not",
1575 trans->delayed_ref_elem.seq);
1576 BUG();
1577 }
Linus' kernel tree