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1/*
2 * Copyright (c) 2000-2005 Silicon Graphics, Inc.
3 * All Rights Reserved.
4 *
5 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU General Public License as
7 * published by the Free Software Foundation.
8 *
9 * This program is distributed in the hope that it would be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write the Free Software Foundation,
16 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
17 */
18#include "xfs.h"
19#include "xfs_fs.h"
20#include "xfs_bit.h"
21#include "xfs_log.h"
22#include "xfs_inum.h"
23#include "xfs_trans.h"
24#include "xfs_sb.h"
25#include "xfs_ag.h"
26#include "xfs_alloc.h"
27#include "xfs_quota.h"
28#include "xfs_mount.h"
29#include "xfs_bmap_btree.h"
30#include "xfs_ialloc_btree.h"
31#include "xfs_dinode.h"
32#include "xfs_inode.h"
33#include "xfs_ialloc.h"
34#include "xfs_itable.h"
35#include "xfs_rtalloc.h"
36#include "xfs_error.h"
37#include "xfs_bmap.h"
38#include "xfs_attr.h"
39#include "xfs_buf_item.h"
40#include "xfs_trans_space.h"
41#include "xfs_utils.h"
42#include "xfs_qm.h"
43#include "xfs_trace.h"
44
45/*
46 * The global quota manager. There is only one of these for the entire
47 * system, _not_ one per file system. XQM keeps track of the overall
48 * quota functionality, including maintaining the freelist and hash
49 * tables of dquots.
50 */
51struct mutex xfs_Gqm_lock;
52struct xfs_qm *xfs_Gqm;
53uint ndquot;
54
55kmem_zone_t *qm_dqzone;
56kmem_zone_t *qm_dqtrxzone;
57
58STATIC void xfs_qm_list_init(xfs_dqlist_t *, char *, int);
59STATIC void xfs_qm_list_destroy(xfs_dqlist_t *);
60
61STATIC int xfs_qm_init_quotainos(xfs_mount_t *);
62STATIC int xfs_qm_init_quotainfo(xfs_mount_t *);
63STATIC int xfs_qm_shake(struct shrinker *, struct shrink_control *);
64
65static struct shrinker xfs_qm_shaker = {
66 .shrink = xfs_qm_shake,
67 .seeks = DEFAULT_SEEKS,
68};
69
70/*
71 * Initialize the XQM structure.
72 * Note that there is not one quota manager per file system.
73 */
74STATIC struct xfs_qm *
75xfs_Gqm_init(void)
76{
77 xfs_dqhash_t *udqhash, *gdqhash;
78 xfs_qm_t *xqm;
79 size_t hsize;
80 uint i;
81
82 /*
83 * Initialize the dquot hash tables.
84 */
85 udqhash = kmem_zalloc_greedy(&hsize,
86 XFS_QM_HASHSIZE_LOW * sizeof(xfs_dqhash_t),
87 XFS_QM_HASHSIZE_HIGH * sizeof(xfs_dqhash_t));
88 if (!udqhash)
89 goto out;
90
91 gdqhash = kmem_zalloc_large(hsize);
92 if (!gdqhash)
93 goto out_free_udqhash;
94
95 hsize /= sizeof(xfs_dqhash_t);
96 ndquot = hsize << 8;
97
98 xqm = kmem_zalloc(sizeof(xfs_qm_t), KM_SLEEP);
99 xqm->qm_dqhashmask = hsize - 1;
100 xqm->qm_usr_dqhtable = udqhash;
101 xqm->qm_grp_dqhtable = gdqhash;
102 ASSERT(xqm->qm_usr_dqhtable != NULL);
103 ASSERT(xqm->qm_grp_dqhtable != NULL);
104
105 for (i = 0; i < hsize; i++) {
106 xfs_qm_list_init(&(xqm->qm_usr_dqhtable[i]), "uxdqh", i);
107 xfs_qm_list_init(&(xqm->qm_grp_dqhtable[i]), "gxdqh", i);
108 }
109
110 /*
111 * Freelist of all dquots of all file systems
112 */
113 INIT_LIST_HEAD(&xqm->qm_dqfrlist);
114 xqm->qm_dqfrlist_cnt = 0;
115 mutex_init(&xqm->qm_dqfrlist_lock);
116
117 /*
118 * dquot zone. we register our own low-memory callback.
119 */
120 if (!qm_dqzone) {
121 xqm->qm_dqzone = kmem_zone_init(sizeof(xfs_dquot_t),
122 "xfs_dquots");
123 qm_dqzone = xqm->qm_dqzone;
124 } else
125 xqm->qm_dqzone = qm_dqzone;
126
127 register_shrinker(&xfs_qm_shaker);
128
129 /*
130 * The t_dqinfo portion of transactions.
131 */
132 if (!qm_dqtrxzone) {
133 xqm->qm_dqtrxzone = kmem_zone_init(sizeof(xfs_dquot_acct_t),
134 "xfs_dqtrx");
135 qm_dqtrxzone = xqm->qm_dqtrxzone;
136 } else
137 xqm->qm_dqtrxzone = qm_dqtrxzone;
138
139 atomic_set(&xqm->qm_totaldquots, 0);
140 xqm->qm_dqfree_ratio = XFS_QM_DQFREE_RATIO;
141 xqm->qm_nrefs = 0;
142 return xqm;
143
144 out_free_udqhash:
145 kmem_free_large(udqhash);
146 out:
147 return NULL;
148}
149
150/*
151 * Destroy the global quota manager when its reference count goes to zero.
152 */
153STATIC void
154xfs_qm_destroy(
155 struct xfs_qm *xqm)
156{
157 struct xfs_dquot *dqp, *n;
158 int hsize, i;
159
160 ASSERT(xqm != NULL);
161 ASSERT(xqm->qm_nrefs == 0);
162 unregister_shrinker(&xfs_qm_shaker);
163 hsize = xqm->qm_dqhashmask + 1;
164 for (i = 0; i < hsize; i++) {
165 xfs_qm_list_destroy(&(xqm->qm_usr_dqhtable[i]));
166 xfs_qm_list_destroy(&(xqm->qm_grp_dqhtable[i]));
167 }
168 kmem_free_large(xqm->qm_usr_dqhtable);
169 kmem_free_large(xqm->qm_grp_dqhtable);
170 xqm->qm_usr_dqhtable = NULL;
171 xqm->qm_grp_dqhtable = NULL;
172 xqm->qm_dqhashmask = 0;
173
174 /* frlist cleanup */
175 mutex_lock(&xqm->qm_dqfrlist_lock);
176 list_for_each_entry_safe(dqp, n, &xqm->qm_dqfrlist, q_freelist) {
177 xfs_dqlock(dqp);
178 list_del_init(&dqp->q_freelist);
179 xfs_Gqm->qm_dqfrlist_cnt--;
180 xfs_dqunlock(dqp);
181 xfs_qm_dqdestroy(dqp);
182 }
183 mutex_unlock(&xqm->qm_dqfrlist_lock);
184 mutex_destroy(&xqm->qm_dqfrlist_lock);
185 kmem_free(xqm);
186}
187
188/*
189 * Called at mount time to let XQM know that another file system is
190 * starting quotas. This isn't crucial information as the individual mount
191 * structures are pretty independent, but it helps the XQM keep a
192 * global view of what's going on.
193 */
194/* ARGSUSED */
195STATIC int
196xfs_qm_hold_quotafs_ref(
197 struct xfs_mount *mp)
198{
199 /*
200 * Need to lock the xfs_Gqm structure for things like this. For example,
201 * the structure could disappear between the entry to this routine and
202 * a HOLD operation if not locked.
203 */
204 mutex_lock(&xfs_Gqm_lock);
205
206 if (!xfs_Gqm) {
207 xfs_Gqm = xfs_Gqm_init();
208 if (!xfs_Gqm) {
209 mutex_unlock(&xfs_Gqm_lock);
210 return ENOMEM;
211 }
212 }
213
214 /*
215 * We can keep a list of all filesystems with quotas mounted for
216 * debugging and statistical purposes, but ...
217 * Just take a reference and get out.
218 */
219 xfs_Gqm->qm_nrefs++;
220 mutex_unlock(&xfs_Gqm_lock);
221
222 return 0;
223}
224
225
226/*
227 * Release the reference that a filesystem took at mount time,
228 * so that we know when we need to destroy the entire quota manager.
229 */
230/* ARGSUSED */
231STATIC void
232xfs_qm_rele_quotafs_ref(
233 struct xfs_mount *mp)
234{
235 xfs_dquot_t *dqp, *n;
236
237 ASSERT(xfs_Gqm);
238 ASSERT(xfs_Gqm->qm_nrefs > 0);
239
240 /*
241 * Go thru the freelist and destroy all inactive dquots.
242 */
243 mutex_lock(&xfs_Gqm->qm_dqfrlist_lock);
244
245 list_for_each_entry_safe(dqp, n, &xfs_Gqm->qm_dqfrlist, q_freelist) {
246 xfs_dqlock(dqp);
247 if (dqp->dq_flags & XFS_DQ_INACTIVE) {
248 ASSERT(dqp->q_mount == NULL);
249 ASSERT(! XFS_DQ_IS_DIRTY(dqp));
250 ASSERT(list_empty(&dqp->q_hashlist));
251 ASSERT(list_empty(&dqp->q_mplist));
252 list_del_init(&dqp->q_freelist);
253 xfs_Gqm->qm_dqfrlist_cnt--;
254 xfs_dqunlock(dqp);
255 xfs_qm_dqdestroy(dqp);
256 } else {
257 xfs_dqunlock(dqp);
258 }
259 }
260 mutex_unlock(&xfs_Gqm->qm_dqfrlist_lock);
261
262 /*
263 * Destroy the entire XQM. If somebody mounts with quotaon, this'll
264 * be restarted.
265 */
266 mutex_lock(&xfs_Gqm_lock);
267 if (--xfs_Gqm->qm_nrefs == 0) {
268 xfs_qm_destroy(xfs_Gqm);
269 xfs_Gqm = NULL;
270 }
271 mutex_unlock(&xfs_Gqm_lock);
272}
273
274/*
275 * Just destroy the quotainfo structure.
276 */
277void
278xfs_qm_unmount(
279 struct xfs_mount *mp)
280{
281 if (mp->m_quotainfo) {
282 xfs_qm_dqpurge_all(mp, XFS_QMOPT_QUOTALL);
283 xfs_qm_destroy_quotainfo(mp);
284 }
285}
286
287
288/*
289 * This is called from xfs_mountfs to start quotas and initialize all
290 * necessary data structures like quotainfo. This is also responsible for
291 * running a quotacheck as necessary. We are guaranteed that the superblock
292 * is consistently read in at this point.
293 *
294 * If we fail here, the mount will continue with quota turned off. We don't
295 * need to inidicate success or failure at all.
296 */
297void
298xfs_qm_mount_quotas(
299 xfs_mount_t *mp)
300{
301 int error = 0;
302 uint sbf;
303
304 /*
305 * If quotas on realtime volumes is not supported, we disable
306 * quotas immediately.
307 */
308 if (mp->m_sb.sb_rextents) {
309 xfs_notice(mp, "Cannot turn on quotas for realtime filesystem");
310 mp->m_qflags = 0;
311 goto write_changes;
312 }
313
314 ASSERT(XFS_IS_QUOTA_RUNNING(mp));
315
316 /*
317 * Allocate the quotainfo structure inside the mount struct, and
318 * create quotainode(s), and change/rev superblock if necessary.
319 */
320 error = xfs_qm_init_quotainfo(mp);
321 if (error) {
322 /*
323 * We must turn off quotas.
324 */
325 ASSERT(mp->m_quotainfo == NULL);
326 mp->m_qflags = 0;
327 goto write_changes;
328 }
329 /*
330 * If any of the quotas are not consistent, do a quotacheck.
331 */
332 if (XFS_QM_NEED_QUOTACHECK(mp)) {
333 error = xfs_qm_quotacheck(mp);
334 if (error) {
335 /* Quotacheck failed and disabled quotas. */
336 return;
337 }
338 }
339 /*
340 * If one type of quotas is off, then it will lose its
341 * quotachecked status, since we won't be doing accounting for
342 * that type anymore.
343 */
344 if (!XFS_IS_UQUOTA_ON(mp))
345 mp->m_qflags &= ~XFS_UQUOTA_CHKD;
346 if (!(XFS_IS_GQUOTA_ON(mp) || XFS_IS_PQUOTA_ON(mp)))
347 mp->m_qflags &= ~XFS_OQUOTA_CHKD;
348
349 write_changes:
350 /*
351 * We actually don't have to acquire the m_sb_lock at all.
352 * This can only be called from mount, and that's single threaded. XXX
353 */
354 spin_lock(&mp->m_sb_lock);
355 sbf = mp->m_sb.sb_qflags;
356 mp->m_sb.sb_qflags = mp->m_qflags & XFS_MOUNT_QUOTA_ALL;
357 spin_unlock(&mp->m_sb_lock);
358
359 if (sbf != (mp->m_qflags & XFS_MOUNT_QUOTA_ALL)) {
360 if (xfs_qm_write_sb_changes(mp, XFS_SB_QFLAGS)) {
361 /*
362 * We could only have been turning quotas off.
363 * We aren't in very good shape actually because
364 * the incore structures are convinced that quotas are
365 * off, but the on disk superblock doesn't know that !
366 */
367 ASSERT(!(XFS_IS_QUOTA_RUNNING(mp)));
368 xfs_alert(mp, "%s: Superblock update failed!",
369 __func__);
370 }
371 }
372
373 if (error) {
374 xfs_warn(mp, "Failed to initialize disk quotas.");
375 return;
376 }
377}
378
379/*
380 * Called from the vfsops layer.
381 */
382void
383xfs_qm_unmount_quotas(
384 xfs_mount_t *mp)
385{
386 /*
387 * Release the dquots that root inode, et al might be holding,
388 * before we flush quotas and blow away the quotainfo structure.
389 */
390 ASSERT(mp->m_rootip);
391 xfs_qm_dqdetach(mp->m_rootip);
392 if (mp->m_rbmip)
393 xfs_qm_dqdetach(mp->m_rbmip);
394 if (mp->m_rsumip)
395 xfs_qm_dqdetach(mp->m_rsumip);
396
397 /*
398 * Release the quota inodes.
399 */
400 if (mp->m_quotainfo) {
401 if (mp->m_quotainfo->qi_uquotaip) {
402 IRELE(mp->m_quotainfo->qi_uquotaip);
403 mp->m_quotainfo->qi_uquotaip = NULL;
404 }
405 if (mp->m_quotainfo->qi_gquotaip) {
406 IRELE(mp->m_quotainfo->qi_gquotaip);
407 mp->m_quotainfo->qi_gquotaip = NULL;
408 }
409 }
410}
411
412/*
413 * Flush all dquots of the given file system to disk. The dquots are
414 * _not_ purged from memory here, just their data written to disk.
415 */
416STATIC int
417xfs_qm_dqflush_all(
418 struct xfs_mount *mp,
419 int sync_mode)
420{
421 struct xfs_quotainfo *q = mp->m_quotainfo;
422 int recl;
423 struct xfs_dquot *dqp;
424 int error;
425
426 if (!q)
427 return 0;
428again:
429 mutex_lock(&q->qi_dqlist_lock);
430 list_for_each_entry(dqp, &q->qi_dqlist, q_mplist) {
431 xfs_dqlock(dqp);
432 if (! XFS_DQ_IS_DIRTY(dqp)) {
433 xfs_dqunlock(dqp);
434 continue;
435 }
436
437 /* XXX a sentinel would be better */
438 recl = q->qi_dqreclaims;
439 if (!xfs_dqflock_nowait(dqp)) {
440 /*
441 * If we can't grab the flush lock then check
442 * to see if the dquot has been flushed delayed
443 * write. If so, grab its buffer and send it
444 * out immediately. We'll be able to acquire
445 * the flush lock when the I/O completes.
446 */
447 xfs_qm_dqflock_pushbuf_wait(dqp);
448 }
449 /*
450 * Let go of the mplist lock. We don't want to hold it
451 * across a disk write.
452 */
453 mutex_unlock(&q->qi_dqlist_lock);
454 error = xfs_qm_dqflush(dqp, sync_mode);
455 xfs_dqunlock(dqp);
456 if (error)
457 return error;
458
459 mutex_lock(&q->qi_dqlist_lock);
460 if (recl != q->qi_dqreclaims) {
461 mutex_unlock(&q->qi_dqlist_lock);
462 /* XXX restart limit */
463 goto again;
464 }
465 }
466
467 mutex_unlock(&q->qi_dqlist_lock);
468 /* return ! busy */
469 return 0;
470}
471/*
472 * Release the group dquot pointers the user dquots may be
473 * carrying around as a hint. mplist is locked on entry and exit.
474 */
475STATIC void
476xfs_qm_detach_gdquots(
477 struct xfs_mount *mp)
478{
479 struct xfs_quotainfo *q = mp->m_quotainfo;
480 struct xfs_dquot *dqp, *gdqp;
481 int nrecl;
482
483 again:
484 ASSERT(mutex_is_locked(&q->qi_dqlist_lock));
485 list_for_each_entry(dqp, &q->qi_dqlist, q_mplist) {
486 xfs_dqlock(dqp);
487 if ((gdqp = dqp->q_gdquot)) {
488 xfs_dqlock(gdqp);
489 dqp->q_gdquot = NULL;
490 }
491 xfs_dqunlock(dqp);
492
493 if (gdqp) {
494 /*
495 * Can't hold the mplist lock across a dqput.
496 * XXXmust convert to marker based iterations here.
497 */
498 nrecl = q->qi_dqreclaims;
499 mutex_unlock(&q->qi_dqlist_lock);
500 xfs_qm_dqput(gdqp);
501
502 mutex_lock(&q->qi_dqlist_lock);
503 if (nrecl != q->qi_dqreclaims)
504 goto again;
505 }
506 }
507}
508
509/*
510 * Go through all the incore dquots of this file system and take them
511 * off the mplist and hashlist, if the dquot type matches the dqtype
512 * parameter. This is used when turning off quota accounting for
513 * users and/or groups, as well as when the filesystem is unmounting.
514 */
515STATIC int
516xfs_qm_dqpurge_int(
517 struct xfs_mount *mp,
518 uint flags)
519{
520 struct xfs_quotainfo *q = mp->m_quotainfo;
521 struct xfs_dquot *dqp, *n;
522 uint dqtype;
523 int nrecl;
524 int nmisses;
525
526 if (!q)
527 return 0;
528
529 dqtype = (flags & XFS_QMOPT_UQUOTA) ? XFS_DQ_USER : 0;
530 dqtype |= (flags & XFS_QMOPT_PQUOTA) ? XFS_DQ_PROJ : 0;
531 dqtype |= (flags & XFS_QMOPT_GQUOTA) ? XFS_DQ_GROUP : 0;
532
533 mutex_lock(&q->qi_dqlist_lock);
534
535 /*
536 * In the first pass through all incore dquots of this filesystem,
537 * we release the group dquot pointers the user dquots may be
538 * carrying around as a hint. We need to do this irrespective of
539 * what's being turned off.
540 */
541 xfs_qm_detach_gdquots(mp);
542
543 again:
544 nmisses = 0;
545 ASSERT(mutex_is_locked(&q->qi_dqlist_lock));
546 /*
547 * Try to get rid of all of the unwanted dquots. The idea is to
548 * get them off mplist and hashlist, but leave them on freelist.
549 */
550 list_for_each_entry_safe(dqp, n, &q->qi_dqlist, q_mplist) {
551 /*
552 * It's OK to look at the type without taking dqlock here.
553 * We're holding the mplist lock here, and that's needed for
554 * a dqreclaim.
555 */
556 if ((dqp->dq_flags & dqtype) == 0)
557 continue;
558
559 if (!mutex_trylock(&dqp->q_hash->qh_lock)) {
560 nrecl = q->qi_dqreclaims;
561 mutex_unlock(&q->qi_dqlist_lock);
562 mutex_lock(&dqp->q_hash->qh_lock);
563 mutex_lock(&q->qi_dqlist_lock);
564
565 /*
566 * XXXTheoretically, we can get into a very long
567 * ping pong game here.
568 * No one can be adding dquots to the mplist at
569 * this point, but somebody might be taking things off.
570 */
571 if (nrecl != q->qi_dqreclaims) {
572 mutex_unlock(&dqp->q_hash->qh_lock);
573 goto again;
574 }
575 }
576
577 /*
578 * Take the dquot off the mplist and hashlist. It may remain on
579 * freelist in INACTIVE state.
580 */
581 nmisses += xfs_qm_dqpurge(dqp);
582 }
583 mutex_unlock(&q->qi_dqlist_lock);
584 return nmisses;
585}
586
587int
588xfs_qm_dqpurge_all(
589 xfs_mount_t *mp,
590 uint flags)
591{
592 int ndquots;
593
594 /*
595 * Purge the dquot cache.
596 * None of the dquots should really be busy at this point.
597 */
598 if (mp->m_quotainfo) {
599 while ((ndquots = xfs_qm_dqpurge_int(mp, flags))) {
600 delay(ndquots * 10);
601 }
602 }
603 return 0;
604}
605
606STATIC int
607xfs_qm_dqattach_one(
608 xfs_inode_t *ip,
609 xfs_dqid_t id,
610 uint type,
611 uint doalloc,
612 xfs_dquot_t *udqhint, /* hint */
613 xfs_dquot_t **IO_idqpp)
614{
615 xfs_dquot_t *dqp;
616 int error;
617
618 ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
619 error = 0;
620
621 /*
622 * See if we already have it in the inode itself. IO_idqpp is
623 * &i_udquot or &i_gdquot. This made the code look weird, but
624 * made the logic a lot simpler.
625 */
626 dqp = *IO_idqpp;
627 if (dqp) {
628 trace_xfs_dqattach_found(dqp);
629 return 0;
630 }
631
632 /*
633 * udqhint is the i_udquot field in inode, and is non-NULL only
634 * when the type arg is group/project. Its purpose is to save a
635 * lookup by dqid (xfs_qm_dqget) by caching a group dquot inside
636 * the user dquot.
637 */
638 if (udqhint) {
639 ASSERT(type == XFS_DQ_GROUP || type == XFS_DQ_PROJ);
640 xfs_dqlock(udqhint);
641
642 /*
643 * No need to take dqlock to look at the id.
644 *
645 * The ID can't change until it gets reclaimed, and it won't
646 * be reclaimed as long as we have a ref from inode and we
647 * hold the ilock.
648 */
649 dqp = udqhint->q_gdquot;
650 if (dqp && be32_to_cpu(dqp->q_core.d_id) == id) {
651 xfs_dqlock(dqp);
652 XFS_DQHOLD(dqp);
653 ASSERT(*IO_idqpp == NULL);
654 *IO_idqpp = dqp;
655
656 xfs_dqunlock(dqp);
657 xfs_dqunlock(udqhint);
658 return 0;
659 }
660
661 /*
662 * We can't hold a dquot lock when we call the dqget code.
663 * We'll deadlock in no time, because of (not conforming to)
664 * lock ordering - the inodelock comes before any dquot lock,
665 * and we may drop and reacquire the ilock in xfs_qm_dqget().
666 */
667 xfs_dqunlock(udqhint);
668 }
669
670 /*
671 * Find the dquot from somewhere. This bumps the
672 * reference count of dquot and returns it locked.
673 * This can return ENOENT if dquot didn't exist on
674 * disk and we didn't ask it to allocate;
675 * ESRCH if quotas got turned off suddenly.
676 */
677 error = xfs_qm_dqget(ip->i_mount, ip, id, type,
678 doalloc | XFS_QMOPT_DOWARN, &dqp);
679 if (error)
680 return error;
681
682 trace_xfs_dqattach_get(dqp);
683
684 /*
685 * dqget may have dropped and re-acquired the ilock, but it guarantees
686 * that the dquot returned is the one that should go in the inode.
687 */
688 *IO_idqpp = dqp;
689 xfs_dqunlock(dqp);
690 return 0;
691}
692
693
694/*
695 * Given a udquot and gdquot, attach a ptr to the group dquot in the
696 * udquot as a hint for future lookups. The idea sounds simple, but the
697 * execution isn't, because the udquot might have a group dquot attached
698 * already and getting rid of that gets us into lock ordering constraints.
699 * The process is complicated more by the fact that the dquots may or may not
700 * be locked on entry.
701 */
702STATIC void
703xfs_qm_dqattach_grouphint(
704 xfs_dquot_t *udq,
705 xfs_dquot_t *gdq)
706{
707 xfs_dquot_t *tmp;
708
709 xfs_dqlock(udq);
710
711 if ((tmp = udq->q_gdquot)) {
712 if (tmp == gdq) {
713 xfs_dqunlock(udq);
714 return;
715 }
716
717 udq->q_gdquot = NULL;
718 /*
719 * We can't keep any dqlocks when calling dqrele,
720 * because the freelist lock comes before dqlocks.
721 */
722 xfs_dqunlock(udq);
723 /*
724 * we took a hard reference once upon a time in dqget,
725 * so give it back when the udquot no longer points at it
726 * dqput() does the unlocking of the dquot.
727 */
728 xfs_qm_dqrele(tmp);
729
730 xfs_dqlock(udq);
731 xfs_dqlock(gdq);
732
733 } else {
734 ASSERT(XFS_DQ_IS_LOCKED(udq));
735 xfs_dqlock(gdq);
736 }
737
738 ASSERT(XFS_DQ_IS_LOCKED(udq));
739 ASSERT(XFS_DQ_IS_LOCKED(gdq));
740 /*
741 * Somebody could have attached a gdquot here,
742 * when we dropped the uqlock. If so, just do nothing.
743 */
744 if (udq->q_gdquot == NULL) {
745 XFS_DQHOLD(gdq);
746 udq->q_gdquot = gdq;
747 }
748
749 xfs_dqunlock(gdq);
750 xfs_dqunlock(udq);
751}
752
753
754/*
755 * Given a locked inode, attach dquot(s) to it, taking U/G/P-QUOTAON
756 * into account.
757 * If XFS_QMOPT_DQALLOC, the dquot(s) will be allocated if needed.
758 * Inode may get unlocked and relocked in here, and the caller must deal with
759 * the consequences.
760 */
761int
762xfs_qm_dqattach_locked(
763 xfs_inode_t *ip,
764 uint flags)
765{
766 xfs_mount_t *mp = ip->i_mount;
767 uint nquotas = 0;
768 int error = 0;
769
770 if (!XFS_IS_QUOTA_RUNNING(mp) ||
771 !XFS_IS_QUOTA_ON(mp) ||
772 !XFS_NOT_DQATTACHED(mp, ip) ||
773 ip->i_ino == mp->m_sb.sb_uquotino ||
774 ip->i_ino == mp->m_sb.sb_gquotino)
775 return 0;
776
777 ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
778
779 if (XFS_IS_UQUOTA_ON(mp)) {
780 error = xfs_qm_dqattach_one(ip, ip->i_d.di_uid, XFS_DQ_USER,
781 flags & XFS_QMOPT_DQALLOC,
782 NULL, &ip->i_udquot);
783 if (error)
784 goto done;
785 nquotas++;
786 }
787
788 ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
789 if (XFS_IS_OQUOTA_ON(mp)) {
790 error = XFS_IS_GQUOTA_ON(mp) ?
791 xfs_qm_dqattach_one(ip, ip->i_d.di_gid, XFS_DQ_GROUP,
792 flags & XFS_QMOPT_DQALLOC,
793 ip->i_udquot, &ip->i_gdquot) :
794 xfs_qm_dqattach_one(ip, xfs_get_projid(ip), XFS_DQ_PROJ,
795 flags & XFS_QMOPT_DQALLOC,
796 ip->i_udquot, &ip->i_gdquot);
797 /*
798 * Don't worry about the udquot that we may have
799 * attached above. It'll get detached, if not already.
800 */
801 if (error)
802 goto done;
803 nquotas++;
804 }
805
806 /*
807 * Attach this group quota to the user quota as a hint.
808 * This WON'T, in general, result in a thrash.
809 */
810 if (nquotas == 2) {
811 ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
812 ASSERT(ip->i_udquot);
813 ASSERT(ip->i_gdquot);
814
815 /*
816 * We may or may not have the i_udquot locked at this point,
817 * but this check is OK since we don't depend on the i_gdquot to
818 * be accurate 100% all the time. It is just a hint, and this
819 * will succeed in general.
820 */
821 if (ip->i_udquot->q_gdquot == ip->i_gdquot)
822 goto done;
823 /*
824 * Attach i_gdquot to the gdquot hint inside the i_udquot.
825 */
826 xfs_qm_dqattach_grouphint(ip->i_udquot, ip->i_gdquot);
827 }
828
829 done:
830#ifdef DEBUG
831 if (!error) {
832 if (XFS_IS_UQUOTA_ON(mp))
833 ASSERT(ip->i_udquot);
834 if (XFS_IS_OQUOTA_ON(mp))
835 ASSERT(ip->i_gdquot);
836 }
837 ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
838#endif
839 return error;
840}
841
842int
843xfs_qm_dqattach(
844 struct xfs_inode *ip,
845 uint flags)
846{
847 int error;
848
849 xfs_ilock(ip, XFS_ILOCK_EXCL);
850 error = xfs_qm_dqattach_locked(ip, flags);
851 xfs_iunlock(ip, XFS_ILOCK_EXCL);
852
853 return error;
854}
855
856/*
857 * Release dquots (and their references) if any.
858 * The inode should be locked EXCL except when this's called by
859 * xfs_ireclaim.
860 */
861void
862xfs_qm_dqdetach(
863 xfs_inode_t *ip)
864{
865 if (!(ip->i_udquot || ip->i_gdquot))
866 return;
867
868 trace_xfs_dquot_dqdetach(ip);
869
870 ASSERT(ip->i_ino != ip->i_mount->m_sb.sb_uquotino);
871 ASSERT(ip->i_ino != ip->i_mount->m_sb.sb_gquotino);
872 if (ip->i_udquot) {
873 xfs_qm_dqrele(ip->i_udquot);
874 ip->i_udquot = NULL;
875 }
876 if (ip->i_gdquot) {
877 xfs_qm_dqrele(ip->i_gdquot);
878 ip->i_gdquot = NULL;
879 }
880}
881
882int
883xfs_qm_sync(
884 struct xfs_mount *mp,
885 int flags)
886{
887 struct xfs_quotainfo *q = mp->m_quotainfo;
888 int recl, restarts;
889 struct xfs_dquot *dqp;
890 int error;
891
892 if (!XFS_IS_QUOTA_RUNNING(mp) || !XFS_IS_QUOTA_ON(mp))
893 return 0;
894
895 restarts = 0;
896
897 again:
898 mutex_lock(&q->qi_dqlist_lock);
899 /*
900 * dqpurge_all() also takes the mplist lock and iterate thru all dquots
901 * in quotaoff. However, if the QUOTA_ACTIVE bits are not cleared
902 * when we have the mplist lock, we know that dquots will be consistent
903 * as long as we have it locked.
904 */
905 if (!XFS_IS_QUOTA_ON(mp)) {
906 mutex_unlock(&q->qi_dqlist_lock);
907 return 0;
908 }
909 ASSERT(mutex_is_locked(&q->qi_dqlist_lock));
910 list_for_each_entry(dqp, &q->qi_dqlist, q_mplist) {
911 /*
912 * If this is vfs_sync calling, then skip the dquots that
913 * don't 'seem' to be dirty. ie. don't acquire dqlock.
914 * This is very similar to what xfs_sync does with inodes.
915 */
916 if (flags & SYNC_TRYLOCK) {
917 if (!XFS_DQ_IS_DIRTY(dqp))
918 continue;
919 if (!xfs_qm_dqlock_nowait(dqp))
920 continue;
921 } else {
922 xfs_dqlock(dqp);
923 }
924
925 /*
926 * Now, find out for sure if this dquot is dirty or not.
927 */
928 if (! XFS_DQ_IS_DIRTY(dqp)) {
929 xfs_dqunlock(dqp);
930 continue;
931 }
932
933 /* XXX a sentinel would be better */
934 recl = q->qi_dqreclaims;
935 if (!xfs_dqflock_nowait(dqp)) {
936 if (flags & SYNC_TRYLOCK) {
937 xfs_dqunlock(dqp);
938 continue;
939 }
940 /*
941 * If we can't grab the flush lock then if the caller
942 * really wanted us to give this our best shot, so
943 * see if we can give a push to the buffer before we wait
944 * on the flush lock. At this point, we know that
945 * even though the dquot is being flushed,
946 * it has (new) dirty data.
947 */
948 xfs_qm_dqflock_pushbuf_wait(dqp);
949 }
950 /*
951 * Let go of the mplist lock. We don't want to hold it
952 * across a disk write
953 */
954 mutex_unlock(&q->qi_dqlist_lock);
955 error = xfs_qm_dqflush(dqp, flags);
956 xfs_dqunlock(dqp);
957 if (error && XFS_FORCED_SHUTDOWN(mp))
958 return 0; /* Need to prevent umount failure */
959 else if (error)
960 return error;
961
962 mutex_lock(&q->qi_dqlist_lock);
963 if (recl != q->qi_dqreclaims) {
964 if (++restarts >= XFS_QM_SYNC_MAX_RESTARTS)
965 break;
966
967 mutex_unlock(&q->qi_dqlist_lock);
968 goto again;
969 }
970 }
971
972 mutex_unlock(&q->qi_dqlist_lock);
973 return 0;
974}
975
976/*
977 * The hash chains and the mplist use the same xfs_dqhash structure as
978 * their list head, but we can take the mplist qh_lock and one of the
979 * hash qh_locks at the same time without any problem as they aren't
980 * related.
981 */
982static struct lock_class_key xfs_quota_mplist_class;
983
984/*
985 * This initializes all the quota information that's kept in the
986 * mount structure
987 */
988STATIC int
989xfs_qm_init_quotainfo(
990 xfs_mount_t *mp)
991{
992 xfs_quotainfo_t *qinf;
993 int error;
994 xfs_dquot_t *dqp;
995
996 ASSERT(XFS_IS_QUOTA_RUNNING(mp));
997
998 /*
999 * Tell XQM that we exist as soon as possible.
1000 */
1001 if ((error = xfs_qm_hold_quotafs_ref(mp))) {
1002 return error;
1003 }
1004
1005 qinf = mp->m_quotainfo = kmem_zalloc(sizeof(xfs_quotainfo_t), KM_SLEEP);
1006
1007 /*
1008 * See if quotainodes are setup, and if not, allocate them,
1009 * and change the superblock accordingly.
1010 */
1011 if ((error = xfs_qm_init_quotainos(mp))) {
1012 kmem_free(qinf);
1013 mp->m_quotainfo = NULL;
1014 return error;
1015 }
1016
1017 INIT_LIST_HEAD(&qinf->qi_dqlist);
1018 mutex_init(&qinf->qi_dqlist_lock);
1019 lockdep_set_class(&qinf->qi_dqlist_lock, &xfs_quota_mplist_class);
1020
1021 qinf->qi_dqreclaims = 0;
1022
1023 /* mutex used to serialize quotaoffs */
1024 mutex_init(&qinf->qi_quotaofflock);
1025
1026 /* Precalc some constants */
1027 qinf->qi_dqchunklen = XFS_FSB_TO_BB(mp, XFS_DQUOT_CLUSTER_SIZE_FSB);
1028 ASSERT(qinf->qi_dqchunklen);
1029 qinf->qi_dqperchunk = BBTOB(qinf->qi_dqchunklen);
1030 do_div(qinf->qi_dqperchunk, sizeof(xfs_dqblk_t));
1031
1032 mp->m_qflags |= (mp->m_sb.sb_qflags & XFS_ALL_QUOTA_CHKD);
1033
1034 /*
1035 * We try to get the limits from the superuser's limits fields.
1036 * This is quite hacky, but it is standard quota practice.
1037 * We look at the USR dquot with id == 0 first, but if user quotas
1038 * are not enabled we goto the GRP dquot with id == 0.
1039 * We don't really care to keep separate default limits for user
1040 * and group quotas, at least not at this point.
1041 */
1042 error = xfs_qm_dqget(mp, NULL, (xfs_dqid_t)0,
1043 XFS_IS_UQUOTA_RUNNING(mp) ? XFS_DQ_USER :
1044 (XFS_IS_GQUOTA_RUNNING(mp) ? XFS_DQ_GROUP :
1045 XFS_DQ_PROJ),
1046 XFS_QMOPT_DQSUSER|XFS_QMOPT_DOWARN,
1047 &dqp);
1048 if (! error) {
1049 xfs_disk_dquot_t *ddqp = &dqp->q_core;
1050
1051 /*
1052 * The warnings and timers set the grace period given to
1053 * a user or group before he or she can not perform any
1054 * more writing. If it is zero, a default is used.
1055 */
1056 qinf->qi_btimelimit = ddqp->d_btimer ?
1057 be32_to_cpu(ddqp->d_btimer) : XFS_QM_BTIMELIMIT;
1058 qinf->qi_itimelimit = ddqp->d_itimer ?
1059 be32_to_cpu(ddqp->d_itimer) : XFS_QM_ITIMELIMIT;
1060 qinf->qi_rtbtimelimit = ddqp->d_rtbtimer ?
1061 be32_to_cpu(ddqp->d_rtbtimer) : XFS_QM_RTBTIMELIMIT;
1062 qinf->qi_bwarnlimit = ddqp->d_bwarns ?
1063 be16_to_cpu(ddqp->d_bwarns) : XFS_QM_BWARNLIMIT;
1064 qinf->qi_iwarnlimit = ddqp->d_iwarns ?
1065 be16_to_cpu(ddqp->d_iwarns) : XFS_QM_IWARNLIMIT;
1066 qinf->qi_rtbwarnlimit = ddqp->d_rtbwarns ?
1067 be16_to_cpu(ddqp->d_rtbwarns) : XFS_QM_RTBWARNLIMIT;
1068 qinf->qi_bhardlimit = be64_to_cpu(ddqp->d_blk_hardlimit);
1069 qinf->qi_bsoftlimit = be64_to_cpu(ddqp->d_blk_softlimit);
1070 qinf->qi_ihardlimit = be64_to_cpu(ddqp->d_ino_hardlimit);
1071 qinf->qi_isoftlimit = be64_to_cpu(ddqp->d_ino_softlimit);
1072 qinf->qi_rtbhardlimit = be64_to_cpu(ddqp->d_rtb_hardlimit);
1073 qinf->qi_rtbsoftlimit = be64_to_cpu(ddqp->d_rtb_softlimit);
1074
1075 /*
1076 * We sent the XFS_QMOPT_DQSUSER flag to dqget because
1077 * we don't want this dquot cached. We haven't done a
1078 * quotacheck yet, and quotacheck doesn't like incore dquots.
1079 */
1080 xfs_qm_dqdestroy(dqp);
1081 } else {
1082 qinf->qi_btimelimit = XFS_QM_BTIMELIMIT;
1083 qinf->qi_itimelimit = XFS_QM_ITIMELIMIT;
1084 qinf->qi_rtbtimelimit = XFS_QM_RTBTIMELIMIT;
1085 qinf->qi_bwarnlimit = XFS_QM_BWARNLIMIT;
1086 qinf->qi_iwarnlimit = XFS_QM_IWARNLIMIT;
1087 qinf->qi_rtbwarnlimit = XFS_QM_RTBWARNLIMIT;
1088 }
1089
1090 return 0;
1091}
1092
1093
1094/*
1095 * Gets called when unmounting a filesystem or when all quotas get
1096 * turned off.
1097 * This purges the quota inodes, destroys locks and frees itself.
1098 */
1099void
1100xfs_qm_destroy_quotainfo(
1101 xfs_mount_t *mp)
1102{
1103 xfs_quotainfo_t *qi;
1104
1105 qi = mp->m_quotainfo;
1106 ASSERT(qi != NULL);
1107 ASSERT(xfs_Gqm != NULL);
1108
1109 /*
1110 * Release the reference that XQM kept, so that we know
1111 * when the XQM structure should be freed. We cannot assume
1112 * that xfs_Gqm is non-null after this point.
1113 */
1114 xfs_qm_rele_quotafs_ref(mp);
1115
1116 ASSERT(list_empty(&qi->qi_dqlist));
1117 mutex_destroy(&qi->qi_dqlist_lock);
1118
1119 if (qi->qi_uquotaip) {
1120 IRELE(qi->qi_uquotaip);
1121 qi->qi_uquotaip = NULL; /* paranoia */
1122 }
1123 if (qi->qi_gquotaip) {
1124 IRELE(qi->qi_gquotaip);
1125 qi->qi_gquotaip = NULL;
1126 }
1127 mutex_destroy(&qi->qi_quotaofflock);
1128 kmem_free(qi);
1129 mp->m_quotainfo = NULL;
1130}
1131
1132
1133
1134/* ------------------- PRIVATE STATIC FUNCTIONS ----------------------- */
1135
1136/* ARGSUSED */
1137STATIC void
1138xfs_qm_list_init(
1139 xfs_dqlist_t *list,
1140 char *str,
1141 int n)
1142{
1143 mutex_init(&list->qh_lock);
1144 INIT_LIST_HEAD(&list->qh_list);
1145 list->qh_version = 0;
1146 list->qh_nelems = 0;
1147}
1148
1149STATIC void
1150xfs_qm_list_destroy(
1151 xfs_dqlist_t *list)
1152{
1153 mutex_destroy(&(list->qh_lock));
1154}
1155
1156/*
1157 * Create an inode and return with a reference already taken, but unlocked
1158 * This is how we create quota inodes
1159 */
1160STATIC int
1161xfs_qm_qino_alloc(
1162 xfs_mount_t *mp,
1163 xfs_inode_t **ip,
1164 __int64_t sbfields,
1165 uint flags)
1166{
1167 xfs_trans_t *tp;
1168 int error;
1169 int committed;
1170
1171 tp = xfs_trans_alloc(mp, XFS_TRANS_QM_QINOCREATE);
1172 if ((error = xfs_trans_reserve(tp,
1173 XFS_QM_QINOCREATE_SPACE_RES(mp),
1174 XFS_CREATE_LOG_RES(mp), 0,
1175 XFS_TRANS_PERM_LOG_RES,
1176 XFS_CREATE_LOG_COUNT))) {
1177 xfs_trans_cancel(tp, 0);
1178 return error;
1179 }
1180
1181 error = xfs_dir_ialloc(&tp, NULL, S_IFREG, 1, 0, 0, 1, ip, &committed);
1182 if (error) {
1183 xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES |
1184 XFS_TRANS_ABORT);
1185 return error;
1186 }
1187
1188 /*
1189 * Make the changes in the superblock, and log those too.
1190 * sbfields arg may contain fields other than *QUOTINO;
1191 * VERSIONNUM for example.
1192 */
1193 spin_lock(&mp->m_sb_lock);
1194 if (flags & XFS_QMOPT_SBVERSION) {
1195 ASSERT(!xfs_sb_version_hasquota(&mp->m_sb));
1196 ASSERT((sbfields & (XFS_SB_VERSIONNUM | XFS_SB_UQUOTINO |
1197 XFS_SB_GQUOTINO | XFS_SB_QFLAGS)) ==
1198 (XFS_SB_VERSIONNUM | XFS_SB_UQUOTINO |
1199 XFS_SB_GQUOTINO | XFS_SB_QFLAGS));
1200
1201 xfs_sb_version_addquota(&mp->m_sb);
1202 mp->m_sb.sb_uquotino = NULLFSINO;
1203 mp->m_sb.sb_gquotino = NULLFSINO;
1204
1205 /* qflags will get updated _after_ quotacheck */
1206 mp->m_sb.sb_qflags = 0;
1207 }
1208 if (flags & XFS_QMOPT_UQUOTA)
1209 mp->m_sb.sb_uquotino = (*ip)->i_ino;
1210 else
1211 mp->m_sb.sb_gquotino = (*ip)->i_ino;
1212 spin_unlock(&mp->m_sb_lock);
1213 xfs_mod_sb(tp, sbfields);
1214
1215 if ((error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES))) {
1216 xfs_alert(mp, "%s failed (error %d)!", __func__, error);
1217 return error;
1218 }
1219 return 0;
1220}
1221
1222
1223STATIC void
1224xfs_qm_reset_dqcounts(
1225 xfs_mount_t *mp,
1226 xfs_buf_t *bp,
1227 xfs_dqid_t id,
1228 uint type)
1229{
1230 xfs_disk_dquot_t *ddq;
1231 int j;
1232
1233 trace_xfs_reset_dqcounts(bp, _RET_IP_);
1234
1235 /*
1236 * Reset all counters and timers. They'll be
1237 * started afresh by xfs_qm_quotacheck.
1238 */
1239#ifdef DEBUG
1240 j = XFS_FSB_TO_B(mp, XFS_DQUOT_CLUSTER_SIZE_FSB);
1241 do_div(j, sizeof(xfs_dqblk_t));
1242 ASSERT(mp->m_quotainfo->qi_dqperchunk == j);
1243#endif
1244 ddq = bp->b_addr;
1245 for (j = 0; j < mp->m_quotainfo->qi_dqperchunk; j++) {
1246 /*
1247 * Do a sanity check, and if needed, repair the dqblk. Don't
1248 * output any warnings because it's perfectly possible to
1249 * find uninitialised dquot blks. See comment in xfs_qm_dqcheck.
1250 */
1251 (void) xfs_qm_dqcheck(mp, ddq, id+j, type, XFS_QMOPT_DQREPAIR,
1252 "xfs_quotacheck");
1253 ddq->d_bcount = 0;
1254 ddq->d_icount = 0;
1255 ddq->d_rtbcount = 0;
1256 ddq->d_btimer = 0;
1257 ddq->d_itimer = 0;
1258 ddq->d_rtbtimer = 0;
1259 ddq->d_bwarns = 0;
1260 ddq->d_iwarns = 0;
1261 ddq->d_rtbwarns = 0;
1262 ddq = (xfs_disk_dquot_t *) ((xfs_dqblk_t *)ddq + 1);
1263 }
1264}
1265
1266STATIC int
1267xfs_qm_dqiter_bufs(
1268 xfs_mount_t *mp,
1269 xfs_dqid_t firstid,
1270 xfs_fsblock_t bno,
1271 xfs_filblks_t blkcnt,
1272 uint flags)
1273{
1274 xfs_buf_t *bp;
1275 int error;
1276 int type;
1277
1278 ASSERT(blkcnt > 0);
1279 type = flags & XFS_QMOPT_UQUOTA ? XFS_DQ_USER :
1280 (flags & XFS_QMOPT_PQUOTA ? XFS_DQ_PROJ : XFS_DQ_GROUP);
1281 error = 0;
1282
1283 /*
1284 * Blkcnt arg can be a very big number, and might even be
1285 * larger than the log itself. So, we have to break it up into
1286 * manageable-sized transactions.
1287 * Note that we don't start a permanent transaction here; we might
1288 * not be able to get a log reservation for the whole thing up front,
1289 * and we don't really care to either, because we just discard
1290 * everything if we were to crash in the middle of this loop.
1291 */
1292 while (blkcnt--) {
1293 error = xfs_trans_read_buf(mp, NULL, mp->m_ddev_targp,
1294 XFS_FSB_TO_DADDR(mp, bno),
1295 mp->m_quotainfo->qi_dqchunklen, 0, &bp);
1296 if (error)
1297 break;
1298
1299 xfs_qm_reset_dqcounts(mp, bp, firstid, type);
1300 xfs_bdwrite(mp, bp);
1301 /*
1302 * goto the next block.
1303 */
1304 bno++;
1305 firstid += mp->m_quotainfo->qi_dqperchunk;
1306 }
1307 return error;
1308}
1309
1310/*
1311 * Iterate over all allocated USR/GRP/PRJ dquots in the system, calling a
1312 * caller supplied function for every chunk of dquots that we find.
1313 */
1314STATIC int
1315xfs_qm_dqiterate(
1316 xfs_mount_t *mp,
1317 xfs_inode_t *qip,
1318 uint flags)
1319{
1320 xfs_bmbt_irec_t *map;
1321 int i, nmaps; /* number of map entries */
1322 int error; /* return value */
1323 xfs_fileoff_t lblkno;
1324 xfs_filblks_t maxlblkcnt;
1325 xfs_dqid_t firstid;
1326 xfs_fsblock_t rablkno;
1327 xfs_filblks_t rablkcnt;
1328
1329 error = 0;
1330 /*
1331 * This looks racy, but we can't keep an inode lock across a
1332 * trans_reserve. But, this gets called during quotacheck, and that
1333 * happens only at mount time which is single threaded.
1334 */
1335 if (qip->i_d.di_nblocks == 0)
1336 return 0;
1337
1338 map = kmem_alloc(XFS_DQITER_MAP_SIZE * sizeof(*map), KM_SLEEP);
1339
1340 lblkno = 0;
1341 maxlblkcnt = XFS_B_TO_FSB(mp, (xfs_ufsize_t)XFS_MAXIOFFSET(mp));
1342 do {
1343 nmaps = XFS_DQITER_MAP_SIZE;
1344 /*
1345 * We aren't changing the inode itself. Just changing
1346 * some of its data. No new blocks are added here, and
1347 * the inode is never added to the transaction.
1348 */
1349 xfs_ilock(qip, XFS_ILOCK_SHARED);
1350 error = xfs_bmapi(NULL, qip, lblkno,
1351 maxlblkcnt - lblkno,
1352 XFS_BMAPI_METADATA,
1353 NULL,
1354 0, map, &nmaps, NULL);
1355 xfs_iunlock(qip, XFS_ILOCK_SHARED);
1356 if (error)
1357 break;
1358
1359 ASSERT(nmaps <= XFS_DQITER_MAP_SIZE);
1360 for (i = 0; i < nmaps; i++) {
1361 ASSERT(map[i].br_startblock != DELAYSTARTBLOCK);
1362 ASSERT(map[i].br_blockcount);
1363
1364
1365 lblkno += map[i].br_blockcount;
1366
1367 if (map[i].br_startblock == HOLESTARTBLOCK)
1368 continue;
1369
1370 firstid = (xfs_dqid_t) map[i].br_startoff *
1371 mp->m_quotainfo->qi_dqperchunk;
1372 /*
1373 * Do a read-ahead on the next extent.
1374 */
1375 if ((i+1 < nmaps) &&
1376 (map[i+1].br_startblock != HOLESTARTBLOCK)) {
1377 rablkcnt = map[i+1].br_blockcount;
1378 rablkno = map[i+1].br_startblock;
1379 while (rablkcnt--) {
1380 xfs_buf_readahead(mp->m_ddev_targp,
1381 XFS_FSB_TO_DADDR(mp, rablkno),
1382 mp->m_quotainfo->qi_dqchunklen);
1383 rablkno++;
1384 }
1385 }
1386 /*
1387 * Iterate thru all the blks in the extent and
1388 * reset the counters of all the dquots inside them.
1389 */
1390 if ((error = xfs_qm_dqiter_bufs(mp,
1391 firstid,
1392 map[i].br_startblock,
1393 map[i].br_blockcount,
1394 flags))) {
1395 break;
1396 }
1397 }
1398
1399 if (error)
1400 break;
1401 } while (nmaps > 0);
1402
1403 kmem_free(map);
1404
1405 return error;
1406}
1407
1408/*
1409 * Called by dqusage_adjust in doing a quotacheck.
1410 *
1411 * Given the inode, and a dquot id this updates both the incore dqout as well
1412 * as the buffer copy. This is so that once the quotacheck is done, we can
1413 * just log all the buffers, as opposed to logging numerous updates to
1414 * individual dquots.
1415 */
1416STATIC int
1417xfs_qm_quotacheck_dqadjust(
1418 struct xfs_inode *ip,
1419 xfs_dqid_t id,
1420 uint type,
1421 xfs_qcnt_t nblks,
1422 xfs_qcnt_t rtblks)
1423{
1424 struct xfs_mount *mp = ip->i_mount;
1425 struct xfs_dquot *dqp;
1426 int error;
1427
1428 error = xfs_qm_dqget(mp, ip, id, type,
1429 XFS_QMOPT_DQALLOC | XFS_QMOPT_DOWARN, &dqp);
1430 if (error) {
1431 /*
1432 * Shouldn't be able to turn off quotas here.
1433 */
1434 ASSERT(error != ESRCH);
1435 ASSERT(error != ENOENT);
1436 return error;
1437 }
1438
1439 trace_xfs_dqadjust(dqp);
1440
1441 /*
1442 * Adjust the inode count and the block count to reflect this inode's
1443 * resource usage.
1444 */
1445 be64_add_cpu(&dqp->q_core.d_icount, 1);
1446 dqp->q_res_icount++;
1447 if (nblks) {
1448 be64_add_cpu(&dqp->q_core.d_bcount, nblks);
1449 dqp->q_res_bcount += nblks;
1450 }
1451 if (rtblks) {
1452 be64_add_cpu(&dqp->q_core.d_rtbcount, rtblks);
1453 dqp->q_res_rtbcount += rtblks;
1454 }
1455
1456 /*
1457 * Set default limits, adjust timers (since we changed usages)
1458 *
1459 * There are no timers for the default values set in the root dquot.
1460 */
1461 if (dqp->q_core.d_id) {
1462 xfs_qm_adjust_dqlimits(mp, &dqp->q_core);
1463 xfs_qm_adjust_dqtimers(mp, &dqp->q_core);
1464 }
1465
1466 dqp->dq_flags |= XFS_DQ_DIRTY;
1467 xfs_qm_dqput(dqp);
1468 return 0;
1469}
1470
1471STATIC int
1472xfs_qm_get_rtblks(
1473 xfs_inode_t *ip,
1474 xfs_qcnt_t *O_rtblks)
1475{
1476 xfs_filblks_t rtblks; /* total rt blks */
1477 xfs_extnum_t idx; /* extent record index */
1478 xfs_ifork_t *ifp; /* inode fork pointer */
1479 xfs_extnum_t nextents; /* number of extent entries */
1480 int error;
1481
1482 ASSERT(XFS_IS_REALTIME_INODE(ip));
1483 ifp = XFS_IFORK_PTR(ip, XFS_DATA_FORK);
1484 if (!(ifp->if_flags & XFS_IFEXTENTS)) {
1485 if ((error = xfs_iread_extents(NULL, ip, XFS_DATA_FORK)))
1486 return error;
1487 }
1488 rtblks = 0;
1489 nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
1490 for (idx = 0; idx < nextents; idx++)
1491 rtblks += xfs_bmbt_get_blockcount(xfs_iext_get_ext(ifp, idx));
1492 *O_rtblks = (xfs_qcnt_t)rtblks;
1493 return 0;
1494}
1495
1496/*
1497 * callback routine supplied to bulkstat(). Given an inumber, find its
1498 * dquots and update them to account for resources taken by that inode.
1499 */
1500/* ARGSUSED */
1501STATIC int
1502xfs_qm_dqusage_adjust(
1503 xfs_mount_t *mp, /* mount point for filesystem */
1504 xfs_ino_t ino, /* inode number to get data for */
1505 void __user *buffer, /* not used */
1506 int ubsize, /* not used */
1507 int *ubused, /* not used */
1508 int *res) /* result code value */
1509{
1510 xfs_inode_t *ip;
1511 xfs_qcnt_t nblks, rtblks = 0;
1512 int error;
1513
1514 ASSERT(XFS_IS_QUOTA_RUNNING(mp));
1515
1516 /*
1517 * rootino must have its resources accounted for, not so with the quota
1518 * inodes.
1519 */
1520 if (ino == mp->m_sb.sb_uquotino || ino == mp->m_sb.sb_gquotino) {
1521 *res = BULKSTAT_RV_NOTHING;
1522 return XFS_ERROR(EINVAL);
1523 }
1524
1525 /*
1526 * We don't _need_ to take the ilock EXCL. However, the xfs_qm_dqget
1527 * interface expects the inode to be exclusively locked because that's
1528 * the case in all other instances. It's OK that we do this because
1529 * quotacheck is done only at mount time.
1530 */
1531 error = xfs_iget(mp, NULL, ino, 0, XFS_ILOCK_EXCL, &ip);
1532 if (error) {
1533 *res = BULKSTAT_RV_NOTHING;
1534 return error;
1535 }
1536
1537 ASSERT(ip->i_delayed_blks == 0);
1538
1539 if (XFS_IS_REALTIME_INODE(ip)) {
1540 /*
1541 * Walk thru the extent list and count the realtime blocks.
1542 */
1543 error = xfs_qm_get_rtblks(ip, &rtblks);
1544 if (error)
1545 goto error0;
1546 }
1547
1548 nblks = (xfs_qcnt_t)ip->i_d.di_nblocks - rtblks;
1549
1550 /*
1551 * Add the (disk blocks and inode) resources occupied by this
1552 * inode to its dquots. We do this adjustment in the incore dquot,
1553 * and also copy the changes to its buffer.
1554 * We don't care about putting these changes in a transaction
1555 * envelope because if we crash in the middle of a 'quotacheck'
1556 * we have to start from the beginning anyway.
1557 * Once we're done, we'll log all the dquot bufs.
1558 *
1559 * The *QUOTA_ON checks below may look pretty racy, but quotachecks
1560 * and quotaoffs don't race. (Quotachecks happen at mount time only).
1561 */
1562 if (XFS_IS_UQUOTA_ON(mp)) {
1563 error = xfs_qm_quotacheck_dqadjust(ip, ip->i_d.di_uid,
1564 XFS_DQ_USER, nblks, rtblks);
1565 if (error)
1566 goto error0;
1567 }
1568
1569 if (XFS_IS_GQUOTA_ON(mp)) {
1570 error = xfs_qm_quotacheck_dqadjust(ip, ip->i_d.di_gid,
1571 XFS_DQ_GROUP, nblks, rtblks);
1572 if (error)
1573 goto error0;
1574 }
1575
1576 if (XFS_IS_PQUOTA_ON(mp)) {
1577 error = xfs_qm_quotacheck_dqadjust(ip, xfs_get_projid(ip),
1578 XFS_DQ_PROJ, nblks, rtblks);
1579 if (error)
1580 goto error0;
1581 }
1582
1583 xfs_iunlock(ip, XFS_ILOCK_EXCL);
1584 IRELE(ip);
1585 *res = BULKSTAT_RV_DIDONE;
1586 return 0;
1587
1588error0:
1589 xfs_iunlock(ip, XFS_ILOCK_EXCL);
1590 IRELE(ip);
1591 *res = BULKSTAT_RV_GIVEUP;
1592 return error;
1593}
1594
1595/*
1596 * Walk thru all the filesystem inodes and construct a consistent view
1597 * of the disk quota world. If the quotacheck fails, disable quotas.
1598 */
1599int
1600xfs_qm_quotacheck(
1601 xfs_mount_t *mp)
1602{
1603 int done, count, error;
1604 xfs_ino_t lastino;
1605 size_t structsz;
1606 xfs_inode_t *uip, *gip;
1607 uint flags;
1608
1609 count = INT_MAX;
1610 structsz = 1;
1611 lastino = 0;
1612 flags = 0;
1613
1614 ASSERT(mp->m_quotainfo->qi_uquotaip || mp->m_quotainfo->qi_gquotaip);
1615 ASSERT(XFS_IS_QUOTA_RUNNING(mp));
1616
1617 /*
1618 * There should be no cached dquots. The (simplistic) quotacheck
1619 * algorithm doesn't like that.
1620 */
1621 ASSERT(list_empty(&mp->m_quotainfo->qi_dqlist));
1622
1623 xfs_notice(mp, "Quotacheck needed: Please wait.");
1624
1625 /*
1626 * First we go thru all the dquots on disk, USR and GRP/PRJ, and reset
1627 * their counters to zero. We need a clean slate.
1628 * We don't log our changes till later.
1629 */
1630 uip = mp->m_quotainfo->qi_uquotaip;
1631 if (uip) {
1632 error = xfs_qm_dqiterate(mp, uip, XFS_QMOPT_UQUOTA);
1633 if (error)
1634 goto error_return;
1635 flags |= XFS_UQUOTA_CHKD;
1636 }
1637
1638 gip = mp->m_quotainfo->qi_gquotaip;
1639 if (gip) {
1640 error = xfs_qm_dqiterate(mp, gip, XFS_IS_GQUOTA_ON(mp) ?
1641 XFS_QMOPT_GQUOTA : XFS_QMOPT_PQUOTA);
1642 if (error)
1643 goto error_return;
1644 flags |= XFS_OQUOTA_CHKD;
1645 }
1646
1647 do {
1648 /*
1649 * Iterate thru all the inodes in the file system,
1650 * adjusting the corresponding dquot counters in core.
1651 */
1652 error = xfs_bulkstat(mp, &lastino, &count,
1653 xfs_qm_dqusage_adjust,
1654 structsz, NULL, &done);
1655 if (error)
1656 break;
1657
1658 } while (!done);
1659
1660 /*
1661 * We've made all the changes that we need to make incore.
1662 * Flush them down to disk buffers if everything was updated
1663 * successfully.
1664 */
1665 if (!error)
1666 error = xfs_qm_dqflush_all(mp, 0);
1667
1668 /*
1669 * We can get this error if we couldn't do a dquot allocation inside
1670 * xfs_qm_dqusage_adjust (via bulkstat). We don't care about the
1671 * dirty dquots that might be cached, we just want to get rid of them
1672 * and turn quotaoff. The dquots won't be attached to any of the inodes
1673 * at this point (because we intentionally didn't in dqget_noattach).
1674 */
1675 if (error) {
1676 xfs_qm_dqpurge_all(mp, XFS_QMOPT_QUOTALL);
1677 goto error_return;
1678 }
1679
1680 /*
1681 * We didn't log anything, because if we crashed, we'll have to
1682 * start the quotacheck from scratch anyway. However, we must make
1683 * sure that our dquot changes are secure before we put the
1684 * quotacheck'd stamp on the superblock. So, here we do a synchronous
1685 * flush.
1686 */
1687 XFS_bflush(mp->m_ddev_targp);
1688
1689 /*
1690 * If one type of quotas is off, then it will lose its
1691 * quotachecked status, since we won't be doing accounting for
1692 * that type anymore.
1693 */
1694 mp->m_qflags &= ~(XFS_OQUOTA_CHKD | XFS_UQUOTA_CHKD);
1695 mp->m_qflags |= flags;
1696
1697 error_return:
1698 if (error) {
1699 xfs_warn(mp,
1700 "Quotacheck: Unsuccessful (Error %d): Disabling quotas.",
1701 error);
1702 /*
1703 * We must turn off quotas.
1704 */
1705 ASSERT(mp->m_quotainfo != NULL);
1706 ASSERT(xfs_Gqm != NULL);
1707 xfs_qm_destroy_quotainfo(mp);
1708 if (xfs_mount_reset_sbqflags(mp)) {
1709 xfs_warn(mp,
1710 "Quotacheck: Failed to reset quota flags.");
1711 }
1712 } else
1713 xfs_notice(mp, "Quotacheck: Done.");
1714 return (error);
1715}
1716
1717/*
1718 * This is called after the superblock has been read in and we're ready to
1719 * iget the quota inodes.
1720 */
1721STATIC int
1722xfs_qm_init_quotainos(
1723 xfs_mount_t *mp)
1724{
1725 xfs_inode_t *uip, *gip;
1726 int error;
1727 __int64_t sbflags;
1728 uint flags;
1729
1730 ASSERT(mp->m_quotainfo);
1731 uip = gip = NULL;
1732 sbflags = 0;
1733 flags = 0;
1734
1735 /*
1736 * Get the uquota and gquota inodes
1737 */
1738 if (xfs_sb_version_hasquota(&mp->m_sb)) {
1739 if (XFS_IS_UQUOTA_ON(mp) &&
1740 mp->m_sb.sb_uquotino != NULLFSINO) {
1741 ASSERT(mp->m_sb.sb_uquotino > 0);
1742 if ((error = xfs_iget(mp, NULL, mp->m_sb.sb_uquotino,
1743 0, 0, &uip)))
1744 return XFS_ERROR(error);
1745 }
1746 if (XFS_IS_OQUOTA_ON(mp) &&
1747 mp->m_sb.sb_gquotino != NULLFSINO) {
1748 ASSERT(mp->m_sb.sb_gquotino > 0);
1749 if ((error = xfs_iget(mp, NULL, mp->m_sb.sb_gquotino,
1750 0, 0, &gip))) {
1751 if (uip)
1752 IRELE(uip);
1753 return XFS_ERROR(error);
1754 }
1755 }
1756 } else {
1757 flags |= XFS_QMOPT_SBVERSION;
1758 sbflags |= (XFS_SB_VERSIONNUM | XFS_SB_UQUOTINO |
1759 XFS_SB_GQUOTINO | XFS_SB_QFLAGS);
1760 }
1761
1762 /*
1763 * Create the two inodes, if they don't exist already. The changes
1764 * made above will get added to a transaction and logged in one of
1765 * the qino_alloc calls below. If the device is readonly,
1766 * temporarily switch to read-write to do this.
1767 */
1768 if (XFS_IS_UQUOTA_ON(mp) && uip == NULL) {
1769 if ((error = xfs_qm_qino_alloc(mp, &uip,
1770 sbflags | XFS_SB_UQUOTINO,
1771 flags | XFS_QMOPT_UQUOTA)))
1772 return XFS_ERROR(error);
1773
1774 flags &= ~XFS_QMOPT_SBVERSION;
1775 }
1776 if (XFS_IS_OQUOTA_ON(mp) && gip == NULL) {
1777 flags |= (XFS_IS_GQUOTA_ON(mp) ?
1778 XFS_QMOPT_GQUOTA : XFS_QMOPT_PQUOTA);
1779 error = xfs_qm_qino_alloc(mp, &gip,
1780 sbflags | XFS_SB_GQUOTINO, flags);
1781 if (error) {
1782 if (uip)
1783 IRELE(uip);
1784
1785 return XFS_ERROR(error);
1786 }
1787 }
1788
1789 mp->m_quotainfo->qi_uquotaip = uip;
1790 mp->m_quotainfo->qi_gquotaip = gip;
1791
1792 return 0;
1793}
1794
1795
1796
1797/*
1798 * Just pop the least recently used dquot off the freelist and
1799 * recycle it. The returned dquot is locked.
1800 */
1801STATIC xfs_dquot_t *
1802xfs_qm_dqreclaim_one(void)
1803{
1804 xfs_dquot_t *dqpout;
1805 xfs_dquot_t *dqp;
1806 int restarts;
1807 int startagain;
1808
1809 restarts = 0;
1810 dqpout = NULL;
1811
1812 /* lockorder: hashchainlock, freelistlock, mplistlock, dqlock, dqflock */
1813again:
1814 startagain = 0;
1815 mutex_lock(&xfs_Gqm->qm_dqfrlist_lock);
1816
1817 list_for_each_entry(dqp, &xfs_Gqm->qm_dqfrlist, q_freelist) {
1818 struct xfs_mount *mp = dqp->q_mount;
1819 xfs_dqlock(dqp);
1820
1821 /*
1822 * We are racing with dqlookup here. Naturally we don't
1823 * want to reclaim a dquot that lookup wants. We release the
1824 * freelist lock and start over, so that lookup will grab
1825 * both the dquot and the freelistlock.
1826 */
1827 if (dqp->dq_flags & XFS_DQ_WANT) {
1828 ASSERT(! (dqp->dq_flags & XFS_DQ_INACTIVE));
1829
1830 trace_xfs_dqreclaim_want(dqp);
1831 XQM_STATS_INC(xqmstats.xs_qm_dqwants);
1832 restarts++;
1833 startagain = 1;
1834 goto dqunlock;
1835 }
1836
1837 /*
1838 * If the dquot is inactive, we are assured that it is
1839 * not on the mplist or the hashlist, and that makes our
1840 * life easier.
1841 */
1842 if (dqp->dq_flags & XFS_DQ_INACTIVE) {
1843 ASSERT(mp == NULL);
1844 ASSERT(! XFS_DQ_IS_DIRTY(dqp));
1845 ASSERT(list_empty(&dqp->q_hashlist));
1846 ASSERT(list_empty(&dqp->q_mplist));
1847 list_del_init(&dqp->q_freelist);
1848 xfs_Gqm->qm_dqfrlist_cnt--;
1849 dqpout = dqp;
1850 XQM_STATS_INC(xqmstats.xs_qm_dqinact_reclaims);
1851 goto dqunlock;
1852 }
1853
1854 ASSERT(dqp->q_hash);
1855 ASSERT(!list_empty(&dqp->q_mplist));
1856
1857 /*
1858 * Try to grab the flush lock. If this dquot is in the process
1859 * of getting flushed to disk, we don't want to reclaim it.
1860 */
1861 if (!xfs_dqflock_nowait(dqp))
1862 goto dqunlock;
1863
1864 /*
1865 * We have the flush lock so we know that this is not in the
1866 * process of being flushed. So, if this is dirty, flush it
1867 * DELWRI so that we don't get a freelist infested with
1868 * dirty dquots.
1869 */
1870 if (XFS_DQ_IS_DIRTY(dqp)) {
1871 int error;
1872
1873 trace_xfs_dqreclaim_dirty(dqp);
1874
1875 /*
1876 * We flush it delayed write, so don't bother
1877 * releasing the freelist lock.
1878 */
1879 error = xfs_qm_dqflush(dqp, 0);
1880 if (error) {
1881 xfs_warn(mp, "%s: dquot %p flush failed",
1882 __func__, dqp);
1883 }
1884 goto dqunlock;
1885 }
1886
1887 /*
1888 * We're trying to get the hashlock out of order. This races
1889 * with dqlookup; so, we giveup and goto the next dquot if
1890 * we couldn't get the hashlock. This way, we won't starve
1891 * a dqlookup process that holds the hashlock that is
1892 * waiting for the freelist lock.
1893 */
1894 if (!mutex_trylock(&dqp->q_hash->qh_lock)) {
1895 restarts++;
1896 goto dqfunlock;
1897 }
1898
1899 /*
1900 * This races with dquot allocation code as well as dqflush_all
1901 * and reclaim code. So, if we failed to grab the mplist lock,
1902 * giveup everything and start over.
1903 */
1904 if (!mutex_trylock(&mp->m_quotainfo->qi_dqlist_lock)) {
1905 restarts++;
1906 startagain = 1;
1907 goto qhunlock;
1908 }
1909
1910 ASSERT(dqp->q_nrefs == 0);
1911 list_del_init(&dqp->q_mplist);
1912 mp->m_quotainfo->qi_dquots--;
1913 mp->m_quotainfo->qi_dqreclaims++;
1914 list_del_init(&dqp->q_hashlist);
1915 dqp->q_hash->qh_version++;
1916 list_del_init(&dqp->q_freelist);
1917 xfs_Gqm->qm_dqfrlist_cnt--;
1918 dqpout = dqp;
1919 mutex_unlock(&mp->m_quotainfo->qi_dqlist_lock);
1920qhunlock:
1921 mutex_unlock(&dqp->q_hash->qh_lock);
1922dqfunlock:
1923 xfs_dqfunlock(dqp);
1924dqunlock:
1925 xfs_dqunlock(dqp);
1926 if (dqpout)
1927 break;
1928 if (restarts >= XFS_QM_RECLAIM_MAX_RESTARTS)
1929 break;
1930 if (startagain) {
1931 mutex_unlock(&xfs_Gqm->qm_dqfrlist_lock);
1932 goto again;
1933 }
1934 }
1935 mutex_unlock(&xfs_Gqm->qm_dqfrlist_lock);
1936 return dqpout;
1937}
1938
1939/*
1940 * Traverse the freelist of dquots and attempt to reclaim a maximum of
1941 * 'howmany' dquots. This operation races with dqlookup(), and attempts to
1942 * favor the lookup function ...
1943 */
1944STATIC int
1945xfs_qm_shake_freelist(
1946 int howmany)
1947{
1948 int nreclaimed = 0;
1949 xfs_dquot_t *dqp;
1950
1951 if (howmany <= 0)
1952 return 0;
1953
1954 while (nreclaimed < howmany) {
1955 dqp = xfs_qm_dqreclaim_one();
1956 if (!dqp)
1957 return nreclaimed;
1958 xfs_qm_dqdestroy(dqp);
1959 nreclaimed++;
1960 }
1961 return nreclaimed;
1962}
1963
1964/*
1965 * The kmem_shake interface is invoked when memory is running low.
1966 */
1967/* ARGSUSED */
1968STATIC int
1969xfs_qm_shake(
1970 struct shrinker *shrink,
1971 struct shrink_control *sc)
1972{
1973 int ndqused, nfree, n;
1974 gfp_t gfp_mask = sc->gfp_mask;
1975
1976 if (!kmem_shake_allow(gfp_mask))
1977 return 0;
1978 if (!xfs_Gqm)
1979 return 0;
1980
1981 nfree = xfs_Gqm->qm_dqfrlist_cnt; /* free dquots */
1982 /* incore dquots in all f/s's */
1983 ndqused = atomic_read(&xfs_Gqm->qm_totaldquots) - nfree;
1984
1985 ASSERT(ndqused >= 0);
1986
1987 if (nfree <= ndqused && nfree < ndquot)
1988 return 0;
1989
1990 ndqused *= xfs_Gqm->qm_dqfree_ratio; /* target # of free dquots */
1991 n = nfree - ndqused - ndquot; /* # over target */
1992
1993 return xfs_qm_shake_freelist(MAX(nfree, n));
1994}
1995
1996
1997/*------------------------------------------------------------------*/
1998
1999/*
2000 * Return a new incore dquot. Depending on the number of
2001 * dquots in the system, we either allocate a new one on the kernel heap,
2002 * or reclaim a free one.
2003 * Return value is B_TRUE if we allocated a new dquot, B_FALSE if we managed
2004 * to reclaim an existing one from the freelist.
2005 */
2006boolean_t
2007xfs_qm_dqalloc_incore(
2008 xfs_dquot_t **O_dqpp)
2009{
2010 xfs_dquot_t *dqp;
2011
2012 /*
2013 * Check against high water mark to see if we want to pop
2014 * a nincompoop dquot off the freelist.
2015 */
2016 if (atomic_read(&xfs_Gqm->qm_totaldquots) >= ndquot) {
2017 /*
2018 * Try to recycle a dquot from the freelist.
2019 */
2020 if ((dqp = xfs_qm_dqreclaim_one())) {
2021 XQM_STATS_INC(xqmstats.xs_qm_dqreclaims);
2022 /*
2023 * Just zero the core here. The rest will get
2024 * reinitialized by caller. XXX we shouldn't even
2025 * do this zero ...
2026 */
2027 memset(&dqp->q_core, 0, sizeof(dqp->q_core));
2028 *O_dqpp = dqp;
2029 return B_FALSE;
2030 }
2031 XQM_STATS_INC(xqmstats.xs_qm_dqreclaim_misses);
2032 }
2033
2034 /*
2035 * Allocate a brand new dquot on the kernel heap and return it
2036 * to the caller to initialize.
2037 */
2038 ASSERT(xfs_Gqm->qm_dqzone != NULL);
2039 *O_dqpp = kmem_zone_zalloc(xfs_Gqm->qm_dqzone, KM_SLEEP);
2040 atomic_inc(&xfs_Gqm->qm_totaldquots);
2041
2042 return B_TRUE;
2043}
2044
2045
2046/*
2047 * Start a transaction and write the incore superblock changes to
2048 * disk. flags parameter indicates which fields have changed.
2049 */
2050int
2051xfs_qm_write_sb_changes(
2052 xfs_mount_t *mp,
2053 __int64_t flags)
2054{
2055 xfs_trans_t *tp;
2056 int error;
2057
2058 tp = xfs_trans_alloc(mp, XFS_TRANS_QM_SBCHANGE);
2059 if ((error = xfs_trans_reserve(tp, 0,
2060 mp->m_sb.sb_sectsize + 128, 0,
2061 0,
2062 XFS_DEFAULT_LOG_COUNT))) {
2063 xfs_trans_cancel(tp, 0);
2064 return error;
2065 }
2066
2067 xfs_mod_sb(tp, flags);
2068 error = xfs_trans_commit(tp, 0);
2069
2070 return error;
2071}
2072
2073
2074/* --------------- utility functions for vnodeops ---------------- */
2075
2076
2077/*
2078 * Given an inode, a uid, gid and prid make sure that we have
2079 * allocated relevant dquot(s) on disk, and that we won't exceed inode
2080 * quotas by creating this file.
2081 * This also attaches dquot(s) to the given inode after locking it,
2082 * and returns the dquots corresponding to the uid and/or gid.
2083 *
2084 * in : inode (unlocked)
2085 * out : udquot, gdquot with references taken and unlocked
2086 */
2087int
2088xfs_qm_vop_dqalloc(
2089 struct xfs_inode *ip,
2090 uid_t uid,
2091 gid_t gid,
2092 prid_t prid,
2093 uint flags,
2094 struct xfs_dquot **O_udqpp,
2095 struct xfs_dquot **O_gdqpp)
2096{
2097 struct xfs_mount *mp = ip->i_mount;
2098 struct xfs_dquot *uq, *gq;
2099 int error;
2100 uint lockflags;
2101
2102 if (!XFS_IS_QUOTA_RUNNING(mp) || !XFS_IS_QUOTA_ON(mp))
2103 return 0;
2104
2105 lockflags = XFS_ILOCK_EXCL;
2106 xfs_ilock(ip, lockflags);
2107
2108 if ((flags & XFS_QMOPT_INHERIT) && XFS_INHERIT_GID(ip))
2109 gid = ip->i_d.di_gid;
2110
2111 /*
2112 * Attach the dquot(s) to this inode, doing a dquot allocation
2113 * if necessary. The dquot(s) will not be locked.
2114 */
2115 if (XFS_NOT_DQATTACHED(mp, ip)) {
2116 error = xfs_qm_dqattach_locked(ip, XFS_QMOPT_DQALLOC);
2117 if (error) {
2118 xfs_iunlock(ip, lockflags);
2119 return error;
2120 }
2121 }
2122
2123 uq = gq = NULL;
2124 if ((flags & XFS_QMOPT_UQUOTA) && XFS_IS_UQUOTA_ON(mp)) {
2125 if (ip->i_d.di_uid != uid) {
2126 /*
2127 * What we need is the dquot that has this uid, and
2128 * if we send the inode to dqget, the uid of the inode
2129 * takes priority over what's sent in the uid argument.
2130 * We must unlock inode here before calling dqget if
2131 * we're not sending the inode, because otherwise
2132 * we'll deadlock by doing trans_reserve while
2133 * holding ilock.
2134 */
2135 xfs_iunlock(ip, lockflags);
2136 if ((error = xfs_qm_dqget(mp, NULL, (xfs_dqid_t) uid,
2137 XFS_DQ_USER,
2138 XFS_QMOPT_DQALLOC |
2139 XFS_QMOPT_DOWARN,
2140 &uq))) {
2141 ASSERT(error != ENOENT);
2142 return error;
2143 }
2144 /*
2145 * Get the ilock in the right order.
2146 */
2147 xfs_dqunlock(uq);
2148 lockflags = XFS_ILOCK_SHARED;
2149 xfs_ilock(ip, lockflags);
2150 } else {
2151 /*
2152 * Take an extra reference, because we'll return
2153 * this to caller
2154 */
2155 ASSERT(ip->i_udquot);
2156 uq = ip->i_udquot;
2157 xfs_dqlock(uq);
2158 XFS_DQHOLD(uq);
2159 xfs_dqunlock(uq);
2160 }
2161 }
2162 if ((flags & XFS_QMOPT_GQUOTA) && XFS_IS_GQUOTA_ON(mp)) {
2163 if (ip->i_d.di_gid != gid) {
2164 xfs_iunlock(ip, lockflags);
2165 if ((error = xfs_qm_dqget(mp, NULL, (xfs_dqid_t)gid,
2166 XFS_DQ_GROUP,
2167 XFS_QMOPT_DQALLOC |
2168 XFS_QMOPT_DOWARN,
2169 &gq))) {
2170 if (uq)
2171 xfs_qm_dqrele(uq);
2172 ASSERT(error != ENOENT);
2173 return error;
2174 }
2175 xfs_dqunlock(gq);
2176 lockflags = XFS_ILOCK_SHARED;
2177 xfs_ilock(ip, lockflags);
2178 } else {
2179 ASSERT(ip->i_gdquot);
2180 gq = ip->i_gdquot;
2181 xfs_dqlock(gq);
2182 XFS_DQHOLD(gq);
2183 xfs_dqunlock(gq);
2184 }
2185 } else if ((flags & XFS_QMOPT_PQUOTA) && XFS_IS_PQUOTA_ON(mp)) {
2186 if (xfs_get_projid(ip) != prid) {
2187 xfs_iunlock(ip, lockflags);
2188 if ((error = xfs_qm_dqget(mp, NULL, (xfs_dqid_t)prid,
2189 XFS_DQ_PROJ,
2190 XFS_QMOPT_DQALLOC |
2191 XFS_QMOPT_DOWARN,
2192 &gq))) {
2193 if (uq)
2194 xfs_qm_dqrele(uq);
2195 ASSERT(error != ENOENT);
2196 return (error);
2197 }
2198 xfs_dqunlock(gq);
2199 lockflags = XFS_ILOCK_SHARED;
2200 xfs_ilock(ip, lockflags);
2201 } else {
2202 ASSERT(ip->i_gdquot);
2203 gq = ip->i_gdquot;
2204 xfs_dqlock(gq);
2205 XFS_DQHOLD(gq);
2206 xfs_dqunlock(gq);
2207 }
2208 }
2209 if (uq)
2210 trace_xfs_dquot_dqalloc(ip);
2211
2212 xfs_iunlock(ip, lockflags);
2213 if (O_udqpp)
2214 *O_udqpp = uq;
2215 else if (uq)
2216 xfs_qm_dqrele(uq);
2217 if (O_gdqpp)
2218 *O_gdqpp = gq;
2219 else if (gq)
2220 xfs_qm_dqrele(gq);
2221 return 0;
2222}
2223
2224/*
2225 * Actually transfer ownership, and do dquot modifications.
2226 * These were already reserved.
2227 */
2228xfs_dquot_t *
2229xfs_qm_vop_chown(
2230 xfs_trans_t *tp,
2231 xfs_inode_t *ip,
2232 xfs_dquot_t **IO_olddq,
2233 xfs_dquot_t *newdq)
2234{
2235 xfs_dquot_t *prevdq;
2236 uint bfield = XFS_IS_REALTIME_INODE(ip) ?
2237 XFS_TRANS_DQ_RTBCOUNT : XFS_TRANS_DQ_BCOUNT;
2238
2239
2240 ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
2241 ASSERT(XFS_IS_QUOTA_RUNNING(ip->i_mount));
2242
2243 /* old dquot */
2244 prevdq = *IO_olddq;
2245 ASSERT(prevdq);
2246 ASSERT(prevdq != newdq);
2247
2248 xfs_trans_mod_dquot(tp, prevdq, bfield, -(ip->i_d.di_nblocks));
2249 xfs_trans_mod_dquot(tp, prevdq, XFS_TRANS_DQ_ICOUNT, -1);
2250
2251 /* the sparkling new dquot */
2252 xfs_trans_mod_dquot(tp, newdq, bfield, ip->i_d.di_nblocks);
2253 xfs_trans_mod_dquot(tp, newdq, XFS_TRANS_DQ_ICOUNT, 1);
2254
2255 /*
2256 * Take an extra reference, because the inode
2257 * is going to keep this dquot pointer even
2258 * after the trans_commit.
2259 */
2260 xfs_dqlock(newdq);
2261 XFS_DQHOLD(newdq);
2262 xfs_dqunlock(newdq);
2263 *IO_olddq = newdq;
2264
2265 return prevdq;
2266}
2267
2268/*
2269 * Quota reservations for setattr(AT_UID|AT_GID|AT_PROJID).
2270 */
2271int
2272xfs_qm_vop_chown_reserve(
2273 xfs_trans_t *tp,
2274 xfs_inode_t *ip,
2275 xfs_dquot_t *udqp,
2276 xfs_dquot_t *gdqp,
2277 uint flags)
2278{
2279 xfs_mount_t *mp = ip->i_mount;
2280 uint delblks, blkflags, prjflags = 0;
2281 xfs_dquot_t *unresudq, *unresgdq, *delblksudq, *delblksgdq;
2282 int error;
2283
2284
2285 ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL|XFS_ILOCK_SHARED));
2286 ASSERT(XFS_IS_QUOTA_RUNNING(mp));
2287
2288 delblks = ip->i_delayed_blks;
2289 delblksudq = delblksgdq = unresudq = unresgdq = NULL;
2290 blkflags = XFS_IS_REALTIME_INODE(ip) ?
2291 XFS_QMOPT_RES_RTBLKS : XFS_QMOPT_RES_REGBLKS;
2292
2293 if (XFS_IS_UQUOTA_ON(mp) && udqp &&
2294 ip->i_d.di_uid != (uid_t)be32_to_cpu(udqp->q_core.d_id)) {
2295 delblksudq = udqp;
2296 /*
2297 * If there are delayed allocation blocks, then we have to
2298 * unreserve those from the old dquot, and add them to the
2299 * new dquot.
2300 */
2301 if (delblks) {
2302 ASSERT(ip->i_udquot);
2303 unresudq = ip->i_udquot;
2304 }
2305 }
2306 if (XFS_IS_OQUOTA_ON(ip->i_mount) && gdqp) {
2307 if (XFS_IS_PQUOTA_ON(ip->i_mount) &&
2308 xfs_get_projid(ip) != be32_to_cpu(gdqp->q_core.d_id))
2309 prjflags = XFS_QMOPT_ENOSPC;
2310
2311 if (prjflags ||
2312 (XFS_IS_GQUOTA_ON(ip->i_mount) &&
2313 ip->i_d.di_gid != be32_to_cpu(gdqp->q_core.d_id))) {
2314 delblksgdq = gdqp;
2315 if (delblks) {
2316 ASSERT(ip->i_gdquot);
2317 unresgdq = ip->i_gdquot;
2318 }
2319 }
2320 }
2321
2322 if ((error = xfs_trans_reserve_quota_bydquots(tp, ip->i_mount,
2323 delblksudq, delblksgdq, ip->i_d.di_nblocks, 1,
2324 flags | blkflags | prjflags)))
2325 return (error);
2326
2327 /*
2328 * Do the delayed blks reservations/unreservations now. Since, these
2329 * are done without the help of a transaction, if a reservation fails
2330 * its previous reservations won't be automatically undone by trans
2331 * code. So, we have to do it manually here.
2332 */
2333 if (delblks) {
2334 /*
2335 * Do the reservations first. Unreservation can't fail.
2336 */
2337 ASSERT(delblksudq || delblksgdq);
2338 ASSERT(unresudq || unresgdq);
2339 if ((error = xfs_trans_reserve_quota_bydquots(NULL, ip->i_mount,
2340 delblksudq, delblksgdq, (xfs_qcnt_t)delblks, 0,
2341 flags | blkflags | prjflags)))
2342 return (error);
2343 xfs_trans_reserve_quota_bydquots(NULL, ip->i_mount,
2344 unresudq, unresgdq, -((xfs_qcnt_t)delblks), 0,
2345 blkflags);
2346 }
2347
2348 return (0);
2349}
2350
2351int
2352xfs_qm_vop_rename_dqattach(
2353 struct xfs_inode **i_tab)
2354{
2355 struct xfs_mount *mp = i_tab[0]->i_mount;
2356 int i;
2357
2358 if (!XFS_IS_QUOTA_RUNNING(mp) || !XFS_IS_QUOTA_ON(mp))
2359 return 0;
2360
2361 for (i = 0; (i < 4 && i_tab[i]); i++) {
2362 struct xfs_inode *ip = i_tab[i];
2363 int error;
2364
2365 /*
2366 * Watch out for duplicate entries in the table.
2367 */
2368 if (i == 0 || ip != i_tab[i-1]) {
2369 if (XFS_NOT_DQATTACHED(mp, ip)) {
2370 error = xfs_qm_dqattach(ip, 0);
2371 if (error)
2372 return error;
2373 }
2374 }
2375 }
2376 return 0;
2377}
2378
2379void
2380xfs_qm_vop_create_dqattach(
2381 struct xfs_trans *tp,
2382 struct xfs_inode *ip,
2383 struct xfs_dquot *udqp,
2384 struct xfs_dquot *gdqp)
2385{
2386 struct xfs_mount *mp = tp->t_mountp;
2387
2388 if (!XFS_IS_QUOTA_RUNNING(mp) || !XFS_IS_QUOTA_ON(mp))
2389 return;
2390
2391 ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
2392 ASSERT(XFS_IS_QUOTA_RUNNING(mp));
2393
2394 if (udqp) {
2395 xfs_dqlock(udqp);
2396 XFS_DQHOLD(udqp);
2397 xfs_dqunlock(udqp);
2398 ASSERT(ip->i_udquot == NULL);
2399 ip->i_udquot = udqp;
2400 ASSERT(XFS_IS_UQUOTA_ON(mp));
2401 ASSERT(ip->i_d.di_uid == be32_to_cpu(udqp->q_core.d_id));
2402 xfs_trans_mod_dquot(tp, udqp, XFS_TRANS_DQ_ICOUNT, 1);
2403 }
2404 if (gdqp) {
2405 xfs_dqlock(gdqp);
2406 XFS_DQHOLD(gdqp);
2407 xfs_dqunlock(gdqp);
2408 ASSERT(ip->i_gdquot == NULL);
2409 ip->i_gdquot = gdqp;
2410 ASSERT(XFS_IS_OQUOTA_ON(mp));
2411 ASSERT((XFS_IS_GQUOTA_ON(mp) ?
2412 ip->i_d.di_gid : xfs_get_projid(ip)) ==
2413 be32_to_cpu(gdqp->q_core.d_id));
2414 xfs_trans_mod_dquot(tp, gdqp, XFS_TRANS_DQ_ICOUNT, 1);
2415 }
2416}
2417
generated by cgit v1.2.2 (git 2.25.0) at 2025-07-27 00:29:54 -0400