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fs: Limit sys_mount to only request filesystem modules.
[deliverable/linux.git] / fs / btrfs / qgroup.c
CommitLineData
bed92eae
AJ		 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>
55e301fd 26#include <linux/btrfs.h>
bed92eae
AJ		 27
28#include "ctree.h"
29#include "transaction.h"
30#include "disk-io.h"
31#include "locking.h"
32#include "ulist.h"
bed92eae
AJ		 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 */
51struct 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 */
94struct 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 */
102static 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 */
121static 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 */
156static 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 */
188static 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 */
213static 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 */
240int 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 }
348next1:
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);
ff24858c
AJ		 382 if (ret == -ENOENT) {
383 printk(KERN_WARNING
384 "btrfs: orphan qgroup relation 0x%llx->0x%llx\n",
385 (unsigned long long)found_key.objectid,
386 (unsigned long long)found_key.offset);
387 ret = 0; /* ignore the error */
388 }
bed92eae
AJ		 389 if (ret)
390 goto out;
391next2:
392 ret = btrfs_next_item(quota_root, path);
393 if (ret < 0)
394 goto out;
395 if (ret)
396 break;
397 }
398out:
399 fs_info->qgroup_flags |= flags;
400 if (!(fs_info->qgroup_flags & BTRFS_QGROUP_STATUS_FLAG_ON)) {
401 fs_info->quota_enabled = 0;
402 fs_info->pending_quota_state = 0;
403 }
404 btrfs_free_path(path);
405
406 return ret < 0 ? ret : 0;
407}
408
409/*
410 * This is only called from close_ctree() or open_ctree(), both in single-
411 * treaded paths. Clean up the in-memory structures. No locking needed.
412 */
413void btrfs_free_qgroup_config(struct btrfs_fs_info *fs_info)
414{
415 struct rb_node *n;
416 struct btrfs_qgroup *qgroup;
417 struct btrfs_qgroup_list *list;
418
419 while ((n = rb_first(&fs_info->qgroup_tree))) {
420 qgroup = rb_entry(n, struct btrfs_qgroup, node);
421 rb_erase(n, &fs_info->qgroup_tree);
422
423 WARN_ON(!list_empty(&qgroup->dirty));
424
425 while (!list_empty(&qgroup->groups)) {
426 list = list_first_entry(&qgroup->groups,
427 struct btrfs_qgroup_list,
428 next_group);
429 list_del(&list->next_group);
430 list_del(&list->next_member);
431 kfree(list);
432 }
433
434 while (!list_empty(&qgroup->members)) {
435 list = list_first_entry(&qgroup->members,
436 struct btrfs_qgroup_list,
437 next_member);
438 list_del(&list->next_group);
439 list_del(&list->next_member);
440 kfree(list);
441 }
442 kfree(qgroup);
443 }
444}
445
446static int add_qgroup_relation_item(struct btrfs_trans_handle *trans,
447 struct btrfs_root *quota_root,
448 u64 src, u64 dst)
449{
450 int ret;
451 struct btrfs_path *path;
452 struct btrfs_key key;
453
454 path = btrfs_alloc_path();
455 if (!path)
456 return -ENOMEM;
457
458 key.objectid = src;
459 key.type = BTRFS_QGROUP_RELATION_KEY;
460 key.offset = dst;
461
462 ret = btrfs_insert_empty_item(trans, quota_root, path, &key, 0);
463
464 btrfs_mark_buffer_dirty(path->nodes[0]);
465
466 btrfs_free_path(path);
467 return ret;
468}
469
470static int del_qgroup_relation_item(struct btrfs_trans_handle *trans,
471 struct btrfs_root *quota_root,
472 u64 src, u64 dst)
473{
474 int ret;
475 struct btrfs_path *path;
476 struct btrfs_key key;
477
478 path = btrfs_alloc_path();
479 if (!path)
480 return -ENOMEM;
481
482 key.objectid = src;
483 key.type = BTRFS_QGROUP_RELATION_KEY;
484 key.offset = dst;
485
486 ret = btrfs_search_slot(trans, quota_root, &key, path, -1, 1);
487 if (ret < 0)
488 goto out;
489
490 if (ret > 0) {
491 ret = -ENOENT;
492 goto out;
493 }
494
495 ret = btrfs_del_item(trans, quota_root, path);
496out:
497 btrfs_free_path(path);
498 return ret;
499}
500
501static int add_qgroup_item(struct btrfs_trans_handle *trans,
502 struct btrfs_root *quota_root, u64 qgroupid)
503{
504 int ret;
505 struct btrfs_path *path;
506 struct btrfs_qgroup_info_item *qgroup_info;
507 struct btrfs_qgroup_limit_item *qgroup_limit;
508 struct extent_buffer *leaf;
509 struct btrfs_key key;
510
511 path = btrfs_alloc_path();
512 if (!path)
513 return -ENOMEM;
514
515 key.objectid = 0;
516 key.type = BTRFS_QGROUP_INFO_KEY;
517 key.offset = qgroupid;
518
519 ret = btrfs_insert_empty_item(trans, quota_root, path, &key,
520 sizeof(*qgroup_info));
521 if (ret)
522 goto out;
523
524 leaf = path->nodes[0];
525 qgroup_info = btrfs_item_ptr(leaf, path->slots[0],
526 struct btrfs_qgroup_info_item);
527 btrfs_set_qgroup_info_generation(leaf, qgroup_info, trans->transid);
528 btrfs_set_qgroup_info_rfer(leaf, qgroup_info, 0);
529 btrfs_set_qgroup_info_rfer_cmpr(leaf, qgroup_info, 0);
530 btrfs_set_qgroup_info_excl(leaf, qgroup_info, 0);
531 btrfs_set_qgroup_info_excl_cmpr(leaf, qgroup_info, 0);
532
533 btrfs_mark_buffer_dirty(leaf);
534
535 btrfs_release_path(path);
536
537 key.type = BTRFS_QGROUP_LIMIT_KEY;
538 ret = btrfs_insert_empty_item(trans, quota_root, path, &key,
539 sizeof(*qgroup_limit));
540 if (ret)
541 goto out;
542
543 leaf = path->nodes[0];
544 qgroup_limit = btrfs_item_ptr(leaf, path->slots[0],
545 struct btrfs_qgroup_limit_item);
546 btrfs_set_qgroup_limit_flags(leaf, qgroup_limit, 0);
547 btrfs_set_qgroup_limit_max_rfer(leaf, qgroup_limit, 0);
548 btrfs_set_qgroup_limit_max_excl(leaf, qgroup_limit, 0);
549 btrfs_set_qgroup_limit_rsv_rfer(leaf, qgroup_limit, 0);
550 btrfs_set_qgroup_limit_rsv_excl(leaf, qgroup_limit, 0);
551
552 btrfs_mark_buffer_dirty(leaf);
553
554 ret = 0;
555out:
556 btrfs_free_path(path);
557 return ret;
558}
559
560static int del_qgroup_item(struct btrfs_trans_handle *trans,
561 struct btrfs_root *quota_root, u64 qgroupid)
562{
563 int ret;
564 struct btrfs_path *path;
565 struct btrfs_key key;
566
567 path = btrfs_alloc_path();
568 if (!path)
569 return -ENOMEM;
570
571 key.objectid = 0;
572 key.type = BTRFS_QGROUP_INFO_KEY;
573 key.offset = qgroupid;
574 ret = btrfs_search_slot(trans, quota_root, &key, path, -1, 1);
575 if (ret < 0)
576 goto out;
577
578 if (ret > 0) {
579 ret = -ENOENT;
580 goto out;
581 }
582
583 ret = btrfs_del_item(trans, quota_root, path);
584 if (ret)
585 goto out;
586
587 btrfs_release_path(path);
588
589 key.type = BTRFS_QGROUP_LIMIT_KEY;
590 ret = btrfs_search_slot(trans, quota_root, &key, path, -1, 1);
591 if (ret < 0)
592 goto out;
593
594 if (ret > 0) {
595 ret = -ENOENT;
596 goto out;
597 }
598
599 ret = btrfs_del_item(trans, quota_root, path);
600
601out:
602 btrfs_free_path(path);
603 return ret;
604}
605
606static int update_qgroup_limit_item(struct btrfs_trans_handle *trans,
607 struct btrfs_root *root, u64 qgroupid,
608 u64 flags, u64 max_rfer, u64 max_excl,
609 u64 rsv_rfer, u64 rsv_excl)
610{
611 struct btrfs_path *path;
612 struct btrfs_key key;
613 struct extent_buffer *l;
614 struct btrfs_qgroup_limit_item *qgroup_limit;
615 int ret;
616 int slot;
617
618 key.objectid = 0;
619 key.type = BTRFS_QGROUP_LIMIT_KEY;
620 key.offset = qgroupid;
621
622 path = btrfs_alloc_path();
84cbe2f7
WS		 623 if (!path)
624 return -ENOMEM;
625
bed92eae
AJ		 626 ret = btrfs_search_slot(trans, root, &key, path, 0, 1);
627 if (ret > 0)
628 ret = -ENOENT;
629
630 if (ret)
631 goto out;
632
633 l = path->nodes[0];
634 slot = path->slots[0];
635 qgroup_limit = btrfs_item_ptr(l, path->slots[0],
636 struct btrfs_qgroup_limit_item);
637 btrfs_set_qgroup_limit_flags(l, qgroup_limit, flags);
638 btrfs_set_qgroup_limit_max_rfer(l, qgroup_limit, max_rfer);
639 btrfs_set_qgroup_limit_max_excl(l, qgroup_limit, max_excl);
640 btrfs_set_qgroup_limit_rsv_rfer(l, qgroup_limit, rsv_rfer);
641 btrfs_set_qgroup_limit_rsv_excl(l, qgroup_limit, rsv_excl);
642
643 btrfs_mark_buffer_dirty(l);
644
645out:
646 btrfs_free_path(path);
647 return ret;
648}
649
650static int update_qgroup_info_item(struct btrfs_trans_handle *trans,
651 struct btrfs_root *root,
652 struct btrfs_qgroup *qgroup)
653{
654 struct btrfs_path *path;
655 struct btrfs_key key;
656 struct extent_buffer *l;
657 struct btrfs_qgroup_info_item *qgroup_info;
658 int ret;
659 int slot;
660
661 key.objectid = 0;
662 key.type = BTRFS_QGROUP_INFO_KEY;
663 key.offset = qgroup->qgroupid;
664
665 path = btrfs_alloc_path();
84cbe2f7
WS		 666 if (!path)
667 return -ENOMEM;
668
bed92eae
AJ		 669 ret = btrfs_search_slot(trans, root, &key, path, 0, 1);
670 if (ret > 0)
671 ret = -ENOENT;
672
673 if (ret)
674 goto out;
675
676 l = path->nodes[0];
677 slot = path->slots[0];
678 qgroup_info = btrfs_item_ptr(l, path->slots[0],
679 struct btrfs_qgroup_info_item);
680 btrfs_set_qgroup_info_generation(l, qgroup_info, trans->transid);
681 btrfs_set_qgroup_info_rfer(l, qgroup_info, qgroup->rfer);
682 btrfs_set_qgroup_info_rfer_cmpr(l, qgroup_info, qgroup->rfer_cmpr);
683 btrfs_set_qgroup_info_excl(l, qgroup_info, qgroup->excl);
684 btrfs_set_qgroup_info_excl_cmpr(l, qgroup_info, qgroup->excl_cmpr);
685
686 btrfs_mark_buffer_dirty(l);
687
688out:
689 btrfs_free_path(path);
690 return ret;
691}
692
693static int update_qgroup_status_item(struct btrfs_trans_handle *trans,
694 struct btrfs_fs_info *fs_info,
695 struct btrfs_root *root)
696{
697 struct btrfs_path *path;
698 struct btrfs_key key;
699 struct extent_buffer *l;
700 struct btrfs_qgroup_status_item *ptr;
701 int ret;
702 int slot;
703
704 key.objectid = 0;
705 key.type = BTRFS_QGROUP_STATUS_KEY;
706 key.offset = 0;
707
708 path = btrfs_alloc_path();
84cbe2f7
WS		 709 if (!path)
710 return -ENOMEM;
711
bed92eae
AJ		 712 ret = btrfs_search_slot(trans, root, &key, path, 0, 1);
713 if (ret > 0)
714 ret = -ENOENT;
715
716 if (ret)
717 goto out;
718
719 l = path->nodes[0];
720 slot = path->slots[0];
721 ptr = btrfs_item_ptr(l, slot, struct btrfs_qgroup_status_item);
722 btrfs_set_qgroup_status_flags(l, ptr, fs_info->qgroup_flags);
723 btrfs_set_qgroup_status_generation(l, ptr, trans->transid);
724 /* XXX scan */
725
726 btrfs_mark_buffer_dirty(l);
727
728out:
729 btrfs_free_path(path);
730 return ret;
731}
732
733/*
734 * called with qgroup_lock held
735 */
736static int btrfs_clean_quota_tree(struct btrfs_trans_handle *trans,
737 struct btrfs_root *root)
738{
739 struct btrfs_path *path;
740 struct btrfs_key key;
06b3a860 741 struct extent_buffer *leaf = NULL;
bed92eae 742 int ret;
06b3a860 743 int nr = 0;
bed92eae 744
bed92eae
AJ		 745 path = btrfs_alloc_path();
746 if (!path)
747 return -ENOMEM;
748
06b3a860
WS		 749 path->leave_spinning = 1;
750
751 key.objectid = 0;
752 key.offset = 0;
753 key.type = 0;
bed92eae 754
06b3a860 755 while (1) {
bed92eae 756 ret = btrfs_search_slot(trans, root, &key, path, -1, 1);
06b3a860
WS		 757 if (ret < 0)
758 goto out;
759 leaf = path->nodes[0];
760 nr = btrfs_header_nritems(leaf);
761 if (!nr)
bed92eae 762 break;
06b3a860
WS		 763 /*
764 * delete the leaf one by one
765 * since the whole tree is going
766 * to be deleted.
767 */
768 path->slots[0] = 0;
769 ret = btrfs_del_items(trans, root, path, 0, nr);
bed92eae
AJ		 770 if (ret)
771 goto out;
06b3a860 772
bed92eae
AJ		 773 btrfs_release_path(path);
774 }
775 ret = 0;
776out:
777 root->fs_info->pending_quota_state = 0;
778 btrfs_free_path(path);
779 return ret;
780}
781
782int btrfs_quota_enable(struct btrfs_trans_handle *trans,
783 struct btrfs_fs_info *fs_info)
784{
785 struct btrfs_root *quota_root;
786 struct btrfs_path *path = NULL;
787 struct btrfs_qgroup_status_item *ptr;
788 struct extent_buffer *leaf;
789 struct btrfs_key key;
790 int ret = 0;
791
792 spin_lock(&fs_info->qgroup_lock);
793 if (fs_info->quota_root) {
794 fs_info->pending_quota_state = 1;
795 spin_unlock(&fs_info->qgroup_lock);
796 goto out;
797 }
798 spin_unlock(&fs_info->qgroup_lock);
799
800 /*
801 * initially create the quota tree
802 */
803 quota_root = btrfs_create_tree(trans, fs_info,
804 BTRFS_QUOTA_TREE_OBJECTID);
805 if (IS_ERR(quota_root)) {
806 ret = PTR_ERR(quota_root);
807 goto out;
808 }
809
810 path = btrfs_alloc_path();
5b7ff5b3
TI		 811 if (!path) {
812 ret = -ENOMEM;
813 goto out_free_root;
814 }
bed92eae
AJ		 815
816 key.objectid = 0;
817 key.type = BTRFS_QGROUP_STATUS_KEY;
818 key.offset = 0;
819
820 ret = btrfs_insert_empty_item(trans, quota_root, path, &key,
821 sizeof(*ptr));
822 if (ret)
5b7ff5b3 823 goto out_free_path;
bed92eae
AJ		 824
825 leaf = path->nodes[0];
826 ptr = btrfs_item_ptr(leaf, path->slots[0],
827 struct btrfs_qgroup_status_item);
828 btrfs_set_qgroup_status_generation(leaf, ptr, trans->transid);
829 btrfs_set_qgroup_status_version(leaf, ptr, BTRFS_QGROUP_STATUS_VERSION);
830 fs_info->qgroup_flags = BTRFS_QGROUP_STATUS_FLAG_ON |
831 BTRFS_QGROUP_STATUS_FLAG_INCONSISTENT;
832 btrfs_set_qgroup_status_flags(leaf, ptr, fs_info->qgroup_flags);
833 btrfs_set_qgroup_status_scan(leaf, ptr, 0);
834
835 btrfs_mark_buffer_dirty(leaf);
836
837 spin_lock(&fs_info->qgroup_lock);
838 fs_info->quota_root = quota_root;
839 fs_info->pending_quota_state = 1;
840 spin_unlock(&fs_info->qgroup_lock);
5b7ff5b3 841out_free_path:
bed92eae 842 btrfs_free_path(path);
5b7ff5b3
TI		 843out_free_root:
844 if (ret) {
845 free_extent_buffer(quota_root->node);
846 free_extent_buffer(quota_root->commit_root);
847 kfree(quota_root);
848 }
849out:
bed92eae
AJ		 850 return ret;
851}
852
853int btrfs_quota_disable(struct btrfs_trans_handle *trans,
854 struct btrfs_fs_info *fs_info)
855{
856 struct btrfs_root *tree_root = fs_info->tree_root;
857 struct btrfs_root *quota_root;
858 int ret = 0;
859
860 spin_lock(&fs_info->qgroup_lock);
683cebda
WS		 861 if (!fs_info->quota_root) {
862 spin_unlock(&fs_info->qgroup_lock);
863 return 0;
864 }
bed92eae
AJ		 865 fs_info->quota_enabled = 0;
866 fs_info->pending_quota_state = 0;
867 quota_root = fs_info->quota_root;
868 fs_info->quota_root = NULL;
869 btrfs_free_qgroup_config(fs_info);
870 spin_unlock(&fs_info->qgroup_lock);
871
872 if (!quota_root)
873 return -EINVAL;
874
875 ret = btrfs_clean_quota_tree(trans, quota_root);
876 if (ret)
877 goto out;
878
879 ret = btrfs_del_root(trans, tree_root, &quota_root->root_key);
880 if (ret)
881 goto out;
882
883 list_del(&quota_root->dirty_list);
884
885 btrfs_tree_lock(quota_root->node);
886 clean_tree_block(trans, tree_root, quota_root->node);
887 btrfs_tree_unlock(quota_root->node);
888 btrfs_free_tree_block(trans, quota_root, quota_root->node, 0, 1);
889
890 free_extent_buffer(quota_root->node);
891 free_extent_buffer(quota_root->commit_root);
892 kfree(quota_root);
893out:
894 return ret;
895}
896
897int btrfs_quota_rescan(struct btrfs_fs_info *fs_info)
898{
899 /* FIXME */
900 return 0;
901}
902
903int btrfs_add_qgroup_relation(struct btrfs_trans_handle *trans,
904 struct btrfs_fs_info *fs_info, u64 src, u64 dst)
905{
906 struct btrfs_root *quota_root;
907 int ret = 0;
908
909 quota_root = fs_info->quota_root;
910 if (!quota_root)
911 return -EINVAL;
912
913 ret = add_qgroup_relation_item(trans, quota_root, src, dst);
914 if (ret)
915 return ret;
916
917 ret = add_qgroup_relation_item(trans, quota_root, dst, src);
918 if (ret) {
919 del_qgroup_relation_item(trans, quota_root, src, dst);
920 return ret;
921 }
922
923 spin_lock(&fs_info->qgroup_lock);
924 ret = add_relation_rb(quota_root->fs_info, src, dst);
925 spin_unlock(&fs_info->qgroup_lock);
926
927 return ret;
928}
929
930int btrfs_del_qgroup_relation(struct btrfs_trans_handle *trans,
931 struct btrfs_fs_info *fs_info, u64 src, u64 dst)
932{
933 struct btrfs_root *quota_root;
934 int ret = 0;
935 int err;
936
937 quota_root = fs_info->quota_root;
938 if (!quota_root)
939 return -EINVAL;
940
941 ret = del_qgroup_relation_item(trans, quota_root, src, dst);
942 err = del_qgroup_relation_item(trans, quota_root, dst, src);
943 if (err && !ret)
944 ret = err;
945
946 spin_lock(&fs_info->qgroup_lock);
947 del_relation_rb(fs_info, src, dst);
948
949 spin_unlock(&fs_info->qgroup_lock);
950
951 return ret;
952}
953
954int btrfs_create_qgroup(struct btrfs_trans_handle *trans,
955 struct btrfs_fs_info *fs_info, u64 qgroupid, char *name)
956{
957 struct btrfs_root *quota_root;
958 struct btrfs_qgroup *qgroup;
959 int ret = 0;
960
961 quota_root = fs_info->quota_root;
962 if (!quota_root)
963 return -EINVAL;
964
965 ret = add_qgroup_item(trans, quota_root, qgroupid);
966
967 spin_lock(&fs_info->qgroup_lock);
968 qgroup = add_qgroup_rb(fs_info, qgroupid);
969 spin_unlock(&fs_info->qgroup_lock);
970
971 if (IS_ERR(qgroup))
972 ret = PTR_ERR(qgroup);
973
974 return ret;
975}
976
977int btrfs_remove_qgroup(struct btrfs_trans_handle *trans,
978 struct btrfs_fs_info *fs_info, u64 qgroupid)
979{
980 struct btrfs_root *quota_root;
2cf68703 981 struct btrfs_qgroup *qgroup;
bed92eae
AJ		 982 int ret = 0;
983
984 quota_root = fs_info->quota_root;
985 if (!quota_root)
986 return -EINVAL;
987
2cf68703
AJ		 988 /* check if there are no relations to this qgroup */
989 spin_lock(&fs_info->qgroup_lock);
990 qgroup = find_qgroup_rb(fs_info, qgroupid);
991 if (qgroup) {
992 if (!list_empty(&qgroup->groups) || !list_empty(&qgroup->members)) {
993 spin_unlock(&fs_info->qgroup_lock);
994 return -EBUSY;
995 }
996 }
997 spin_unlock(&fs_info->qgroup_lock);
998
bed92eae
AJ		 999 ret = del_qgroup_item(trans, quota_root, qgroupid);
1000
1001 spin_lock(&fs_info->qgroup_lock);
1002 del_qgroup_rb(quota_root->fs_info, qgroupid);
bed92eae
AJ		 1003 spin_unlock(&fs_info->qgroup_lock);
1004
1005 return ret;
1006}
1007
1008int btrfs_limit_qgroup(struct btrfs_trans_handle *trans,
1009 struct btrfs_fs_info *fs_info, u64 qgroupid,
1010 struct btrfs_qgroup_limit *limit)
1011{
1012 struct btrfs_root *quota_root = fs_info->quota_root;
1013 struct btrfs_qgroup *qgroup;
1014 int ret = 0;
1015
1016 if (!quota_root)
1017 return -EINVAL;
1018
1019 ret = update_qgroup_limit_item(trans, quota_root, qgroupid,
1020 limit->flags, limit->max_rfer,
1021 limit->max_excl, limit->rsv_rfer,
1022 limit->rsv_excl);
1023 if (ret) {
1024 fs_info->qgroup_flags |= BTRFS_QGROUP_STATUS_FLAG_INCONSISTENT;
1025 printk(KERN_INFO "unable to update quota limit for %llu\n",
1026 (unsigned long long)qgroupid);
1027 }
1028
1029 spin_lock(&fs_info->qgroup_lock);
1030
1031 qgroup = find_qgroup_rb(fs_info, qgroupid);
1032 if (!qgroup) {
1033 ret = -ENOENT;
1034 goto unlock;
1035 }
1036 qgroup->lim_flags = limit->flags;
1037 qgroup->max_rfer = limit->max_rfer;
1038 qgroup->max_excl = limit->max_excl;
1039 qgroup->rsv_rfer = limit->rsv_rfer;
1040 qgroup->rsv_excl = limit->rsv_excl;
1041
1042unlock:
1043 spin_unlock(&fs_info->qgroup_lock);
1044
1045 return ret;
1046}
1047
1048static void qgroup_dirty(struct btrfs_fs_info *fs_info,
1049 struct btrfs_qgroup *qgroup)
1050{
1051 if (list_empty(&qgroup->dirty))
1052 list_add(&qgroup->dirty, &fs_info->dirty_qgroups);
1053}
1054
1055/*
1056 * btrfs_qgroup_record_ref is called when the ref is added or deleted. it puts
1057 * the modification into a list that's later used by btrfs_end_transaction to
1058 * pass the recorded modifications on to btrfs_qgroup_account_ref.
1059 */
1060int btrfs_qgroup_record_ref(struct btrfs_trans_handle *trans,
1061 struct btrfs_delayed_ref_node *node,
1062 struct btrfs_delayed_extent_op *extent_op)
1063{
1064 struct qgroup_update *u;
1065
1066 BUG_ON(!trans->delayed_ref_elem.seq);
1067 u = kmalloc(sizeof(*u), GFP_NOFS);
1068 if (!u)
1069 return -ENOMEM;
1070
1071 u->node = node;
1072 u->extent_op = extent_op;
1073 list_add_tail(&u->list, &trans->qgroup_ref_list);
1074
1075 return 0;
1076}
1077
1078/*
1079 * btrfs_qgroup_account_ref is called for every ref that is added to or deleted
1080 * from the fs. First, all roots referencing the extent are searched, and
1081 * then the space is accounted accordingly to the different roots. The
1082 * accounting algorithm works in 3 steps documented inline.
1083 */
1084int btrfs_qgroup_account_ref(struct btrfs_trans_handle *trans,
1085 struct btrfs_fs_info *fs_info,
1086 struct btrfs_delayed_ref_node *node,
1087 struct btrfs_delayed_extent_op *extent_op)
1088{
1089 struct btrfs_key ins;
1090 struct btrfs_root *quota_root;
1091 u64 ref_root;
1092 struct btrfs_qgroup *qgroup;
1093 struct ulist_node *unode;
1094 struct ulist *roots = NULL;
1095 struct ulist *tmp = NULL;
1096 struct ulist_iterator uiter;
1097 u64 seq;
1098 int ret = 0;
1099 int sgn;
1100
1101 if (!fs_info->quota_enabled)
1102 return 0;
1103
1104 BUG_ON(!fs_info->quota_root);
1105
1106 ins.objectid = node->bytenr;
1107 ins.offset = node->num_bytes;
1108 ins.type = BTRFS_EXTENT_ITEM_KEY;
1109
1110 if (node->type == BTRFS_TREE_BLOCK_REF_KEY ||
1111 node->type == BTRFS_SHARED_BLOCK_REF_KEY) {
1112 struct btrfs_delayed_tree_ref *ref;
1113 ref = btrfs_delayed_node_to_tree_ref(node);
1114 ref_root = ref->root;
1115 } else if (node->type == BTRFS_EXTENT_DATA_REF_KEY ||
1116 node->type == BTRFS_SHARED_DATA_REF_KEY) {
1117 struct btrfs_delayed_data_ref *ref;
1118 ref = btrfs_delayed_node_to_data_ref(node);
1119 ref_root = ref->root;
1120 } else {
1121 BUG();
1122 }
1123
1124 if (!is_fstree(ref_root)) {
1125 /*
1126 * non-fs-trees are not being accounted
1127 */
1128 return 0;
1129 }
1130
1131 switch (node->action) {
1132 case BTRFS_ADD_DELAYED_REF:
1133 case BTRFS_ADD_DELAYED_EXTENT:
1134 sgn = 1;
1135 break;
1136 case BTRFS_DROP_DELAYED_REF:
1137 sgn = -1;
1138 break;
1139 case BTRFS_UPDATE_DELAYED_HEAD:
1140 return 0;
1141 default:
1142 BUG();
1143 }
1144
1145 /*
1146 * the delayed ref sequence number we pass depends on the direction of
1147 * the operation. for add operations, we pass (node->seq - 1) to skip
1148 * the delayed ref's current sequence number, because we need the state
1149 * of the tree before the add operation. for delete operations, we pass
1150 * (node->seq) to include the delayed ref's current sequence number,
1151 * because we need the state of the tree after the delete operation.
1152 */
1153 ret = btrfs_find_all_roots(trans, fs_info, node->bytenr,
1154 sgn > 0 ? node->seq - 1 : node->seq, &roots);
1155 if (ret < 0)
1156 goto out;
1157
1158 spin_lock(&fs_info->qgroup_lock);
1159 quota_root = fs_info->quota_root;
1160 if (!quota_root)
1161 goto unlock;
1162
1163 qgroup = find_qgroup_rb(fs_info, ref_root);
1164 if (!qgroup)
1165 goto unlock;
1166
1167 /*
1168 * step 1: for each old ref, visit all nodes once and inc refcnt
1169 */
1170 tmp = ulist_alloc(GFP_ATOMIC);
1171 if (!tmp) {
1172 ret = -ENOMEM;
1173 goto unlock;
1174 }
1175 seq = fs_info->qgroup_seq;
1176 fs_info->qgroup_seq += roots->nnodes + 1; /* max refcnt */
1177
1178 ULIST_ITER_INIT(&uiter);
1179 while ((unode = ulist_next(roots, &uiter))) {
1180 struct ulist_node *tmp_unode;
1181 struct ulist_iterator tmp_uiter;
1182 struct btrfs_qgroup *qg;
1183
1184 qg = find_qgroup_rb(fs_info, unode->val);
1185 if (!qg)
1186 continue;
1187
1188 ulist_reinit(tmp);
1189 /* XXX id not needed */
995e01b7 1190 ulist_add(tmp, qg->qgroupid, (u64)(uintptr_t)qg, GFP_ATOMIC);
bed92eae
AJ		 1191 ULIST_ITER_INIT(&tmp_uiter);
1192 while ((tmp_unode = ulist_next(tmp, &tmp_uiter))) {
1193 struct btrfs_qgroup_list *glist;
1194
995e01b7 1195 qg = (struct btrfs_qgroup *)(uintptr_t)tmp_unode->aux;
bed92eae
AJ		 1196 if (qg->refcnt < seq)
1197 qg->refcnt = seq + 1;
1198 else
1199 ++qg->refcnt;
1200
1201 list_for_each_entry(glist, &qg->groups, next_group) {
1202 ulist_add(tmp, glist->group->qgroupid,
995e01b7 1203 (u64)(uintptr_t)glist->group,
bed92eae
AJ		 1204 GFP_ATOMIC);
1205 }
1206 }
1207 }
1208
1209 /*
1210 * step 2: walk from the new root
1211 */
1212 ulist_reinit(tmp);
995e01b7 1213 ulist_add(tmp, qgroup->qgroupid, (uintptr_t)qgroup, GFP_ATOMIC);
bed92eae
AJ		 1214 ULIST_ITER_INIT(&uiter);
1215 while ((unode = ulist_next(tmp, &uiter))) {
1216 struct btrfs_qgroup *qg;
1217 struct btrfs_qgroup_list *glist;
1218
995e01b7 1219 qg = (struct btrfs_qgroup *)(uintptr_t)unode->aux;
bed92eae
AJ		 1220 if (qg->refcnt < seq) {
1221 /* not visited by step 1 */
1222 qg->rfer += sgn * node->num_bytes;
1223 qg->rfer_cmpr += sgn * node->num_bytes;
1224 if (roots->nnodes == 0) {
1225 qg->excl += sgn * node->num_bytes;
1226 qg->excl_cmpr += sgn * node->num_bytes;
1227 }
1228 qgroup_dirty(fs_info, qg);
1229 }
1230 WARN_ON(qg->tag >= seq);
1231 qg->tag = seq;
1232
1233 list_for_each_entry(glist, &qg->groups, next_group) {
1234 ulist_add(tmp, glist->group->qgroupid,
995e01b7 1235 (uintptr_t)glist->group, GFP_ATOMIC);
bed92eae
AJ		 1236 }
1237 }
1238
1239 /*
1240 * step 3: walk again from old refs
1241 */
1242 ULIST_ITER_INIT(&uiter);
1243 while ((unode = ulist_next(roots, &uiter))) {
1244 struct btrfs_qgroup *qg;
1245 struct ulist_node *tmp_unode;
1246 struct ulist_iterator tmp_uiter;
1247
1248 qg = find_qgroup_rb(fs_info, unode->val);
1249 if (!qg)
1250 continue;
1251
1252 ulist_reinit(tmp);
995e01b7 1253 ulist_add(tmp, qg->qgroupid, (uintptr_t)qg, GFP_ATOMIC);
bed92eae
AJ		 1254 ULIST_ITER_INIT(&tmp_uiter);
1255 while ((tmp_unode = ulist_next(tmp, &tmp_uiter))) {
1256 struct btrfs_qgroup_list *glist;
1257
995e01b7 1258 qg = (struct btrfs_qgroup *)(uintptr_t)tmp_unode->aux;
bed92eae
AJ		 1259 if (qg->tag == seq)
1260 continue;
1261
1262 if (qg->refcnt - seq == roots->nnodes) {
1263 qg->excl -= sgn * node->num_bytes;
1264 qg->excl_cmpr -= sgn * node->num_bytes;
1265 qgroup_dirty(fs_info, qg);
1266 }
1267
1268 list_for_each_entry(glist, &qg->groups, next_group) {
1269 ulist_add(tmp, glist->group->qgroupid,
995e01b7 1270 (uintptr_t)glist->group,
bed92eae
AJ		 1271 GFP_ATOMIC);
1272 }
1273 }
1274 }
1275 ret = 0;
1276unlock:
1277 spin_unlock(&fs_info->qgroup_lock);
1278out:
1279 ulist_free(roots);
1280 ulist_free(tmp);
1281
1282 return ret;
1283}
1284
1285/*
1286 * called from commit_transaction. Writes all changed qgroups to disk.
1287 */
1288int btrfs_run_qgroups(struct btrfs_trans_handle *trans,
1289 struct btrfs_fs_info *fs_info)
1290{
1291 struct btrfs_root *quota_root = fs_info->quota_root;
1292 int ret = 0;
1293
1294 if (!quota_root)
1295 goto out;
1296
1297 fs_info->quota_enabled = fs_info->pending_quota_state;
1298
1299 spin_lock(&fs_info->qgroup_lock);
1300 while (!list_empty(&fs_info->dirty_qgroups)) {
1301 struct btrfs_qgroup *qgroup;
1302 qgroup = list_first_entry(&fs_info->dirty_qgroups,
1303 struct btrfs_qgroup, dirty);
1304 list_del_init(&qgroup->dirty);
1305 spin_unlock(&fs_info->qgroup_lock);
1306 ret = update_qgroup_info_item(trans, quota_root, qgroup);
1307 if (ret)
1308 fs_info->qgroup_flags |=
1309 BTRFS_QGROUP_STATUS_FLAG_INCONSISTENT;
1310 spin_lock(&fs_info->qgroup_lock);
1311 }
1312 if (fs_info->quota_enabled)
1313 fs_info->qgroup_flags |= BTRFS_QGROUP_STATUS_FLAG_ON;
1314 else
1315 fs_info->qgroup_flags &= ~BTRFS_QGROUP_STATUS_FLAG_ON;
1316 spin_unlock(&fs_info->qgroup_lock);
1317
1318 ret = update_qgroup_status_item(trans, fs_info, quota_root);
1319 if (ret)
1320 fs_info->qgroup_flags |= BTRFS_QGROUP_STATUS_FLAG_INCONSISTENT;
1321
1322out:
1323
1324 return ret;
1325}
1326
1327/*
1328 * copy the acounting information between qgroups. This is necessary when a
1329 * snapshot or a subvolume is created
1330 */
1331int btrfs_qgroup_inherit(struct btrfs_trans_handle *trans,
1332 struct btrfs_fs_info *fs_info, u64 srcid, u64 objectid,
1333 struct btrfs_qgroup_inherit *inherit)
1334{
1335 int ret = 0;
1336 int i;
1337 u64 *i_qgroups;
1338 struct btrfs_root *quota_root = fs_info->quota_root;
1339 struct btrfs_qgroup *srcgroup;
1340 struct btrfs_qgroup *dstgroup;
1341 u32 level_size = 0;
1342
1343 if (!fs_info->quota_enabled)
1344 return 0;
1345
1346 if (!quota_root)
1347 return -EINVAL;
1348
1349 /*
1350 * create a tracking group for the subvol itself
1351 */
1352 ret = add_qgroup_item(trans, quota_root, objectid);
1353 if (ret)
1354 goto out;
1355
1356 if (inherit && inherit->flags & BTRFS_QGROUP_INHERIT_SET_LIMITS) {
1357 ret = update_qgroup_limit_item(trans, quota_root, objectid,
1358 inherit->lim.flags,
1359 inherit->lim.max_rfer,
1360 inherit->lim.max_excl,
1361 inherit->lim.rsv_rfer,
1362 inherit->lim.rsv_excl);
1363 if (ret)
1364 goto out;
1365 }
1366
1367 if (srcid) {
1368 struct btrfs_root *srcroot;
1369 struct btrfs_key srckey;
1370 int srcroot_level;
1371
1372 srckey.objectid = srcid;
1373 srckey.type = BTRFS_ROOT_ITEM_KEY;
1374 srckey.offset = (u64)-1;
1375 srcroot = btrfs_read_fs_root_no_name(fs_info, &srckey);
1376 if (IS_ERR(srcroot)) {
1377 ret = PTR_ERR(srcroot);
1378 goto out;
1379 }
1380
1381 rcu_read_lock();
1382 srcroot_level = btrfs_header_level(srcroot->node);
1383 level_size = btrfs_level_size(srcroot, srcroot_level);
1384 rcu_read_unlock();
1385 }
1386
1387 /*
1388 * add qgroup to all inherited groups
1389 */
1390 if (inherit) {
1391 i_qgroups = (u64 *)(inherit + 1);
1392 for (i = 0; i < inherit->num_qgroups; ++i) {
1393 ret = add_qgroup_relation_item(trans, quota_root,
1394 objectid, *i_qgroups);
1395 if (ret)
1396 goto out;
1397 ret = add_qgroup_relation_item(trans, quota_root,
1398 *i_qgroups, objectid);
1399 if (ret)
1400 goto out;
1401 ++i_qgroups;
1402 }
1403 }
1404
1405
1406 spin_lock(&fs_info->qgroup_lock);
1407
1408 dstgroup = add_qgroup_rb(fs_info, objectid);
57a5a882
DC		 1409 if (IS_ERR(dstgroup)) {
1410 ret = PTR_ERR(dstgroup);
bed92eae 1411 goto unlock;
57a5a882 1412 }
bed92eae
AJ		 1413
1414 if (srcid) {
1415 srcgroup = find_qgroup_rb(fs_info, srcid);
f3a87f1b 1416 if (!srcgroup)
bed92eae
AJ		 1417 goto unlock;
1418 dstgroup->rfer = srcgroup->rfer - level_size;
1419 dstgroup->rfer_cmpr = srcgroup->rfer_cmpr - level_size;
1420 srcgroup->excl = level_size;
1421 srcgroup->excl_cmpr = level_size;
1422 qgroup_dirty(fs_info, dstgroup);
1423 qgroup_dirty(fs_info, srcgroup);
1424 }
1425
f3a87f1b 1426 if (!inherit)
bed92eae
AJ		 1427 goto unlock;
1428
1429 i_qgroups = (u64 *)(inherit + 1);
1430 for (i = 0; i < inherit->num_qgroups; ++i) {
1431 ret = add_relation_rb(quota_root->fs_info, objectid,
1432 *i_qgroups);
1433 if (ret)
1434 goto unlock;
1435 ++i_qgroups;
1436 }
1437
1438 for (i = 0; i < inherit->num_ref_copies; ++i) {
1439 struct btrfs_qgroup *src;
1440 struct btrfs_qgroup *dst;
1441
1442 src = find_qgroup_rb(fs_info, i_qgroups[0]);
1443 dst = find_qgroup_rb(fs_info, i_qgroups[1]);
1444
1445 if (!src || !dst) {
1446 ret = -EINVAL;
1447 goto unlock;
1448 }
1449
1450 dst->rfer = src->rfer - level_size;
1451 dst->rfer_cmpr = src->rfer_cmpr - level_size;
1452 i_qgroups += 2;
1453 }
1454 for (i = 0; i < inherit->num_excl_copies; ++i) {
1455 struct btrfs_qgroup *src;
1456 struct btrfs_qgroup *dst;
1457
1458 src = find_qgroup_rb(fs_info, i_qgroups[0]);
1459 dst = find_qgroup_rb(fs_info, i_qgroups[1]);
1460
1461 if (!src || !dst) {
1462 ret = -EINVAL;
1463 goto unlock;
1464 }
1465
1466 dst->excl = src->excl + level_size;
1467 dst->excl_cmpr = src->excl_cmpr + level_size;
1468 i_qgroups += 2;
1469 }
1470
1471unlock:
1472 spin_unlock(&fs_info->qgroup_lock);
1473out:
1474 return ret;
1475}
1476
1477/*
1478 * reserve some space for a qgroup and all its parents. The reservation takes
1479 * place with start_transaction or dealloc_reserve, similar to ENOSPC
1480 * accounting. If not enough space is available, EDQUOT is returned.
1481 * We assume that the requested space is new for all qgroups.
1482 */
1483int btrfs_qgroup_reserve(struct btrfs_root *root, u64 num_bytes)
1484{
1485 struct btrfs_root *quota_root;
1486 struct btrfs_qgroup *qgroup;
1487 struct btrfs_fs_info *fs_info = root->fs_info;
1488 u64 ref_root = root->root_key.objectid;
1489 int ret = 0;
1490 struct ulist *ulist = NULL;
1491 struct ulist_node *unode;
1492 struct ulist_iterator uiter;
1493
1494 if (!is_fstree(ref_root))
1495 return 0;
1496
1497 if (num_bytes == 0)
1498 return 0;
1499
1500 spin_lock(&fs_info->qgroup_lock);
1501 quota_root = fs_info->quota_root;
1502 if (!quota_root)
1503 goto out;
1504
1505 qgroup = find_qgroup_rb(fs_info, ref_root);
1506 if (!qgroup)
1507 goto out;
1508
1509 /*
1510 * in a first step, we check all affected qgroups if any limits would
1511 * be exceeded
1512 */
1513 ulist = ulist_alloc(GFP_ATOMIC);
3d6b5c3b
TI		 1514 if (!ulist) {
1515 ret = -ENOMEM;
1516 goto out;
1517 }
995e01b7 1518 ulist_add(ulist, qgroup->qgroupid, (uintptr_t)qgroup, GFP_ATOMIC);
bed92eae
AJ		 1519 ULIST_ITER_INIT(&uiter);
1520 while ((unode = ulist_next(ulist, &uiter))) {
1521 struct btrfs_qgroup *qg;
1522 struct btrfs_qgroup_list *glist;
1523
995e01b7 1524 qg = (struct btrfs_qgroup *)(uintptr_t)unode->aux;
bed92eae
AJ		 1525
1526 if ((qg->lim_flags & BTRFS_QGROUP_LIMIT_MAX_RFER) &&
1527 qg->reserved + qg->rfer + num_bytes >
1528 qg->max_rfer)
1529 ret = -EDQUOT;
1530
1531 if ((qg->lim_flags & BTRFS_QGROUP_LIMIT_MAX_EXCL) &&
1532 qg->reserved + qg->excl + num_bytes >
1533 qg->max_excl)
1534 ret = -EDQUOT;
1535
1536 list_for_each_entry(glist, &qg->groups, next_group) {
1537 ulist_add(ulist, glist->group->qgroupid,
995e01b7 1538 (uintptr_t)glist->group, GFP_ATOMIC);
bed92eae
AJ		 1539 }
1540 }
1541 if (ret)
1542 goto out;
1543
1544 /*
1545 * no limits exceeded, now record the reservation into all qgroups
1546 */
1547 ULIST_ITER_INIT(&uiter);
1548 while ((unode = ulist_next(ulist, &uiter))) {
1549 struct btrfs_qgroup *qg;
1550
995e01b7 1551 qg = (struct btrfs_qgroup *)(uintptr_t)unode->aux;
bed92eae
AJ		 1552
1553 qg->reserved += num_bytes;
1554 }
1555
1556out:
1557 spin_unlock(&fs_info->qgroup_lock);
1558 ulist_free(ulist);
1559
1560 return ret;
1561}
1562
1563void btrfs_qgroup_free(struct btrfs_root *root, u64 num_bytes)
1564{
1565 struct btrfs_root *quota_root;
1566 struct btrfs_qgroup *qgroup;
1567 struct btrfs_fs_info *fs_info = root->fs_info;
1568 struct ulist *ulist = NULL;
1569 struct ulist_node *unode;
1570 struct ulist_iterator uiter;
1571 u64 ref_root = root->root_key.objectid;
1572
1573 if (!is_fstree(ref_root))
1574 return;
1575
1576 if (num_bytes == 0)
1577 return;
1578
1579 spin_lock(&fs_info->qgroup_lock);
1580
1581 quota_root = fs_info->quota_root;
1582 if (!quota_root)
1583 goto out;
1584
1585 qgroup = find_qgroup_rb(fs_info, ref_root);
1586 if (!qgroup)
1587 goto out;
1588
1589 ulist = ulist_alloc(GFP_ATOMIC);
3d6b5c3b
TI		 1590 if (!ulist) {
1591 btrfs_std_error(fs_info, -ENOMEM);
1592 goto out;
1593 }
995e01b7 1594 ulist_add(ulist, qgroup->qgroupid, (uintptr_t)qgroup, GFP_ATOMIC);
bed92eae
AJ		 1595 ULIST_ITER_INIT(&uiter);
1596 while ((unode = ulist_next(ulist, &uiter))) {
1597 struct btrfs_qgroup *qg;
1598 struct btrfs_qgroup_list *glist;
1599
995e01b7 1600 qg = (struct btrfs_qgroup *)(uintptr_t)unode->aux;
bed92eae
AJ		 1601
1602 qg->reserved -= num_bytes;
1603
1604 list_for_each_entry(glist, &qg->groups, next_group) {
1605 ulist_add(ulist, glist->group->qgroupid,
995e01b7 1606 (uintptr_t)glist->group, GFP_ATOMIC);
bed92eae
AJ		 1607 }
1608 }
1609
1610out:
1611 spin_unlock(&fs_info->qgroup_lock);
1612 ulist_free(ulist);
1613}
1614
1615void assert_qgroups_uptodate(struct btrfs_trans_handle *trans)
1616{
1617 if (list_empty(&trans->qgroup_ref_list) && !trans->delayed_ref_elem.seq)
1618 return;
1619 printk(KERN_ERR "btrfs: qgroups not uptodate in trans handle %p: list is%s empty, seq is %llu\n",
1620 trans, list_empty(&trans->qgroup_ref_list) ? "" : " not",
1621 trans->delayed_ref_elem.seq);
1622 BUG();
1623}
Linux kernel - Deliverables
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