2 * Copyright (c) 2000-2003 Silicon Graphics, Inc.
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.
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.
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
22 #include "xfs_trans.h"
25 #include "xfs_alloc.h"
26 #include "xfs_quota.h"
27 #include "xfs_mount.h"
28 #include "xfs_bmap_btree.h"
29 #include "xfs_inode.h"
31 #include "xfs_rtalloc.h"
32 #include "xfs_error.h"
33 #include "xfs_itable.h"
35 #include "xfs_buf_item.h"
36 #include "xfs_trans_space.h"
37 #include "xfs_trans_priv.h"
39 #include "xfs_trace.h"
46 * dquot->q_qlock (xfs_dqlock() and friends)
47 * dquot->q_flush (xfs_dqflock() and friends)
50 * If two dquots need to be locked the order is user before group/project,
51 * otherwise by the lowest id first, see xfs_dqlock2.
55 xfs_buftarg_t *xfs_dqerror_target;
58 int xfs_dqerror_mod = 33;
61 struct kmem_zone *xfs_qm_dqtrxzone;
62 static struct kmem_zone *xfs_qm_dqzone;
64 static struct lock_class_key xfs_dquot_other_class;
67 * This is called to free all the memory associated with a dquot
73 ASSERT(list_empty(&dqp->q_lru));
75 mutex_destroy(&dqp->q_qlock);
76 kmem_zone_free(xfs_qm_dqzone, dqp);
78 XFS_STATS_DEC(xs_qm_dquot);
82 * If default limits are in force, push them into the dquot now.
83 * We overwrite the dquot limits only if they are zero and this
84 * is not the root dquot.
87 xfs_qm_adjust_dqlimits(
91 xfs_quotainfo_t *q = mp->m_quotainfo;
95 if (q->qi_bsoftlimit && !d->d_blk_softlimit)
96 d->d_blk_softlimit = cpu_to_be64(q->qi_bsoftlimit);
97 if (q->qi_bhardlimit && !d->d_blk_hardlimit)
98 d->d_blk_hardlimit = cpu_to_be64(q->qi_bhardlimit);
99 if (q->qi_isoftlimit && !d->d_ino_softlimit)
100 d->d_ino_softlimit = cpu_to_be64(q->qi_isoftlimit);
101 if (q->qi_ihardlimit && !d->d_ino_hardlimit)
102 d->d_ino_hardlimit = cpu_to_be64(q->qi_ihardlimit);
103 if (q->qi_rtbsoftlimit && !d->d_rtb_softlimit)
104 d->d_rtb_softlimit = cpu_to_be64(q->qi_rtbsoftlimit);
105 if (q->qi_rtbhardlimit && !d->d_rtb_hardlimit)
106 d->d_rtb_hardlimit = cpu_to_be64(q->qi_rtbhardlimit);
110 * Check the limits and timers of a dquot and start or reset timers
112 * This gets called even when quota enforcement is OFF, which makes our
113 * life a little less complicated. (We just don't reject any quota
114 * reservations in that case, when enforcement is off).
115 * We also return 0 as the values of the timers in Q_GETQUOTA calls, when
117 * In contrast, warnings are a little different in that they don't
118 * 'automatically' get started when limits get exceeded. They do
119 * get reset to zero, however, when we find the count to be under
120 * the soft limit (they are only ever set non-zero via userspace).
123 xfs_qm_adjust_dqtimers(
130 if (d->d_blk_hardlimit)
131 ASSERT(be64_to_cpu(d->d_blk_softlimit) <=
132 be64_to_cpu(d->d_blk_hardlimit));
133 if (d->d_ino_hardlimit)
134 ASSERT(be64_to_cpu(d->d_ino_softlimit) <=
135 be64_to_cpu(d->d_ino_hardlimit));
136 if (d->d_rtb_hardlimit)
137 ASSERT(be64_to_cpu(d->d_rtb_softlimit) <=
138 be64_to_cpu(d->d_rtb_hardlimit));
142 if ((d->d_blk_softlimit &&
143 (be64_to_cpu(d->d_bcount) >
144 be64_to_cpu(d->d_blk_softlimit))) ||
145 (d->d_blk_hardlimit &&
146 (be64_to_cpu(d->d_bcount) >
147 be64_to_cpu(d->d_blk_hardlimit)))) {
148 d->d_btimer = cpu_to_be32(get_seconds() +
149 mp->m_quotainfo->qi_btimelimit);
154 if ((!d->d_blk_softlimit ||
155 (be64_to_cpu(d->d_bcount) <=
156 be64_to_cpu(d->d_blk_softlimit))) &&
157 (!d->d_blk_hardlimit ||
158 (be64_to_cpu(d->d_bcount) <=
159 be64_to_cpu(d->d_blk_hardlimit)))) {
165 if ((d->d_ino_softlimit &&
166 (be64_to_cpu(d->d_icount) >
167 be64_to_cpu(d->d_ino_softlimit))) ||
168 (d->d_ino_hardlimit &&
169 (be64_to_cpu(d->d_icount) >
170 be64_to_cpu(d->d_ino_hardlimit)))) {
171 d->d_itimer = cpu_to_be32(get_seconds() +
172 mp->m_quotainfo->qi_itimelimit);
177 if ((!d->d_ino_softlimit ||
178 (be64_to_cpu(d->d_icount) <=
179 be64_to_cpu(d->d_ino_softlimit))) &&
180 (!d->d_ino_hardlimit ||
181 (be64_to_cpu(d->d_icount) <=
182 be64_to_cpu(d->d_ino_hardlimit)))) {
187 if (!d->d_rtbtimer) {
188 if ((d->d_rtb_softlimit &&
189 (be64_to_cpu(d->d_rtbcount) >
190 be64_to_cpu(d->d_rtb_softlimit))) ||
191 (d->d_rtb_hardlimit &&
192 (be64_to_cpu(d->d_rtbcount) >
193 be64_to_cpu(d->d_rtb_hardlimit)))) {
194 d->d_rtbtimer = cpu_to_be32(get_seconds() +
195 mp->m_quotainfo->qi_rtbtimelimit);
200 if ((!d->d_rtb_softlimit ||
201 (be64_to_cpu(d->d_rtbcount) <=
202 be64_to_cpu(d->d_rtb_softlimit))) &&
203 (!d->d_rtb_hardlimit ||
204 (be64_to_cpu(d->d_rtbcount) <=
205 be64_to_cpu(d->d_rtb_hardlimit)))) {
212 * initialize a buffer full of dquots and log the whole thing
215 xfs_qm_init_dquot_blk(
222 struct xfs_quotainfo *q = mp->m_quotainfo;
227 ASSERT(xfs_buf_islocked(bp));
232 * ID of the first dquot in the block - id's are zero based.
234 curid = id - (id % q->qi_dqperchunk);
236 memset(d, 0, BBTOB(q->qi_dqchunklen));
237 for (i = 0; i < q->qi_dqperchunk; i++, d++, curid++) {
238 d->dd_diskdq.d_magic = cpu_to_be16(XFS_DQUOT_MAGIC);
239 d->dd_diskdq.d_version = XFS_DQUOT_VERSION;
240 d->dd_diskdq.d_id = cpu_to_be32(curid);
241 d->dd_diskdq.d_flags = type;
244 xfs_trans_dquot_buf(tp, bp,
245 (type & XFS_DQ_USER ? XFS_BLF_UDQUOT_BUF :
246 ((type & XFS_DQ_PROJ) ? XFS_BLF_PDQUOT_BUF :
247 XFS_BLF_GDQUOT_BUF)));
248 xfs_trans_log_buf(tp, bp, 0, BBTOB(q->qi_dqchunklen) - 1);
254 * Allocate a block and fill it with dquots.
255 * This is called when the bmapi finds a hole.
263 xfs_fileoff_t offset_fsb,
266 xfs_fsblock_t firstblock;
267 xfs_bmap_free_t flist;
269 int nmaps, error, committed;
271 xfs_trans_t *tp = *tpp;
275 trace_xfs_dqalloc(dqp);
278 * Initialize the bmap freelist prior to calling bmapi code.
280 xfs_bmap_init(&flist, &firstblock);
281 xfs_ilock(quotip, XFS_ILOCK_EXCL);
283 * Return if this type of quotas is turned off while we didn't
286 if (!xfs_this_quota_on(dqp->q_mount, dqp->dq_flags)) {
287 xfs_iunlock(quotip, XFS_ILOCK_EXCL);
291 xfs_trans_ijoin(tp, quotip, XFS_ILOCK_EXCL);
293 error = xfs_bmapi_write(tp, quotip, offset_fsb,
294 XFS_DQUOT_CLUSTER_SIZE_FSB, XFS_BMAPI_METADATA,
295 &firstblock, XFS_QM_DQALLOC_SPACE_RES(mp),
296 &map, &nmaps, &flist);
299 ASSERT(map.br_blockcount == XFS_DQUOT_CLUSTER_SIZE_FSB);
301 ASSERT((map.br_startblock != DELAYSTARTBLOCK) &&
302 (map.br_startblock != HOLESTARTBLOCK));
305 * Keep track of the blkno to save a lookup later
307 dqp->q_blkno = XFS_FSB_TO_DADDR(mp, map.br_startblock);
309 /* now we can just get the buffer (there's nothing to read yet) */
310 bp = xfs_trans_get_buf(tp, mp->m_ddev_targp,
312 mp->m_quotainfo->qi_dqchunklen,
315 error = xfs_buf_geterror(bp);
320 * Make a chunk of dquots out of this buffer and log
323 xfs_qm_init_dquot_blk(tp, mp, be32_to_cpu(dqp->q_core.d_id),
324 dqp->dq_flags & XFS_DQ_ALLTYPES, bp);
327 * xfs_bmap_finish() may commit the current transaction and
328 * start a second transaction if the freelist is not empty.
330 * Since we still want to modify this buffer, we need to
331 * ensure that the buffer is not released on commit of
332 * the first transaction and ensure the buffer is added to the
333 * second transaction.
335 * If there is only one transaction then don't stop the buffer
336 * from being released when it commits later on.
339 xfs_trans_bhold(tp, bp);
341 if ((error = xfs_bmap_finish(tpp, &flist, &committed))) {
347 xfs_trans_bjoin(tp, bp);
349 xfs_trans_bhold_release(tp, bp);
356 xfs_bmap_cancel(&flist);
358 xfs_iunlock(quotip, XFS_ILOCK_EXCL);
364 * Maps a dquot to the buffer containing its on-disk version.
365 * This returns a ptr to the buffer containing the on-disk dquot
366 * in the bpp param, and a ptr to the on-disk dquot within that buffer
372 xfs_disk_dquot_t **O_ddpp,
377 int nmaps = 1, error;
379 xfs_inode_t *quotip = XFS_DQ_TO_QIP(dqp);
380 xfs_mount_t *mp = dqp->q_mount;
381 xfs_disk_dquot_t *ddq;
382 xfs_dqid_t id = be32_to_cpu(dqp->q_core.d_id);
383 xfs_trans_t *tp = (tpp ? *tpp : NULL);
385 dqp->q_fileoffset = (xfs_fileoff_t)id / mp->m_quotainfo->qi_dqperchunk;
387 xfs_ilock(quotip, XFS_ILOCK_SHARED);
388 if (!xfs_this_quota_on(dqp->q_mount, dqp->dq_flags)) {
390 * Return if this type of quotas is turned off while we
391 * didn't have the quota inode lock.
393 xfs_iunlock(quotip, XFS_ILOCK_SHARED);
398 * Find the block map; no allocations yet
400 error = xfs_bmapi_read(quotip, dqp->q_fileoffset,
401 XFS_DQUOT_CLUSTER_SIZE_FSB, &map, &nmaps, 0);
403 xfs_iunlock(quotip, XFS_ILOCK_SHARED);
408 ASSERT(map.br_blockcount == 1);
411 * Offset of dquot in the (fixed sized) dquot chunk.
413 dqp->q_bufoffset = (id % mp->m_quotainfo->qi_dqperchunk) *
416 ASSERT(map.br_startblock != DELAYSTARTBLOCK);
417 if (map.br_startblock == HOLESTARTBLOCK) {
419 * We don't allocate unless we're asked to
421 if (!(flags & XFS_QMOPT_DQALLOC))
425 error = xfs_qm_dqalloc(tpp, mp, dqp, quotip,
426 dqp->q_fileoffset, &bp);
431 trace_xfs_dqtobp_read(dqp);
434 * store the blkno etc so that we don't have to do the
435 * mapping all the time
437 dqp->q_blkno = XFS_FSB_TO_DADDR(mp, map.br_startblock);
439 error = xfs_trans_read_buf(mp, tp, mp->m_ddev_targp,
441 mp->m_quotainfo->qi_dqchunklen,
444 return XFS_ERROR(error);
447 ASSERT(xfs_buf_islocked(bp));
450 * calculate the location of the dquot inside the buffer.
452 ddq = bp->b_addr + dqp->q_bufoffset;
455 * A simple sanity check in case we got a corrupted dquot...
457 error = xfs_qm_dqcheck(mp, ddq, id, dqp->dq_flags & XFS_DQ_ALLTYPES,
458 flags & (XFS_QMOPT_DQREPAIR|XFS_QMOPT_DOWARN),
461 if (!(flags & XFS_QMOPT_DQREPAIR)) {
462 xfs_trans_brelse(tp, bp);
463 return XFS_ERROR(EIO);
475 * Read in the ondisk dquot using dqtobp() then copy it to an incore version,
476 * and release the buffer immediately.
478 * If XFS_QMOPT_DQALLOC is set, allocate a dquot on disk if it needed.
482 struct xfs_mount *mp,
486 struct xfs_dquot **O_dqpp)
488 struct xfs_dquot *dqp;
489 struct xfs_disk_dquot *ddqp;
491 struct xfs_trans *tp = NULL;
496 dqp = kmem_zone_zalloc(xfs_qm_dqzone, KM_SLEEP);
498 dqp->dq_flags = type;
499 dqp->q_core.d_id = cpu_to_be32(id);
501 INIT_LIST_HEAD(&dqp->q_lru);
502 mutex_init(&dqp->q_qlock);
503 init_waitqueue_head(&dqp->q_pinwait);
506 * Because we want to use a counting completion, complete
507 * the flush completion once to allow a single access to
508 * the flush completion without blocking.
510 init_completion(&dqp->q_flush);
511 complete(&dqp->q_flush);
514 * Make sure group quotas have a different lock class than user
517 if (!(type & XFS_DQ_USER))
518 lockdep_set_class(&dqp->q_qlock, &xfs_dquot_other_class);
520 XFS_STATS_INC(xs_qm_dquot);
522 trace_xfs_dqread(dqp);
524 if (flags & XFS_QMOPT_DQALLOC) {
525 tp = xfs_trans_alloc(mp, XFS_TRANS_QM_DQALLOC);
526 error = xfs_trans_reserve(tp, XFS_QM_DQALLOC_SPACE_RES(mp),
527 XFS_WRITE_LOG_RES(mp) +
529 * Round the chunklen up to the next multiple
530 * of 128 (buf log item chunk size)).
532 BBTOB(mp->m_quotainfo->qi_dqchunklen) - 1 + 128,
534 XFS_TRANS_PERM_LOG_RES,
535 XFS_WRITE_LOG_COUNT);
538 cancelflags = XFS_TRANS_RELEASE_LOG_RES;
542 * get a pointer to the on-disk dquot and the buffer containing it
543 * dqp already knows its own type (GROUP/USER).
545 error = xfs_qm_dqtobp(&tp, dqp, &ddqp, &bp, flags);
548 * This can happen if quotas got turned off (ESRCH),
549 * or if the dquot didn't exist on disk and we ask to
552 trace_xfs_dqread_fail(dqp);
553 cancelflags |= XFS_TRANS_ABORT;
557 /* copy everything from disk dquot to the incore dquot */
558 memcpy(&dqp->q_core, ddqp, sizeof(xfs_disk_dquot_t));
559 xfs_qm_dquot_logitem_init(dqp);
562 * Reservation counters are defined as reservation plus current usage
563 * to avoid having to add every time.
565 dqp->q_res_bcount = be64_to_cpu(ddqp->d_bcount);
566 dqp->q_res_icount = be64_to_cpu(ddqp->d_icount);
567 dqp->q_res_rtbcount = be64_to_cpu(ddqp->d_rtbcount);
569 /* Mark the buf so that this will stay incore a little longer */
570 xfs_buf_set_ref(bp, XFS_DQUOT_REF);
573 * We got the buffer with a xfs_trans_read_buf() (in dqtobp())
574 * So we need to release with xfs_trans_brelse().
575 * The strategy here is identical to that of inodes; we lock
576 * the dquot in xfs_qm_dqget() before making it accessible to
577 * others. This is because dquots, like inodes, need a good level of
578 * concurrency, and we don't want to take locks on the entire buffers
579 * for dquot accesses.
580 * Note also that the dquot buffer may even be dirty at this point, if
581 * this particular dquot was repaired. We still aren't afraid to
582 * brelse it because we have the changes incore.
584 ASSERT(xfs_buf_islocked(bp));
585 xfs_trans_brelse(tp, bp);
588 error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES);
598 xfs_trans_cancel(tp, cancelflags);
600 xfs_qm_dqdestroy(dqp);
606 * Given the file system, inode OR id, and type (UDQUOT/GDQUOT), return a
607 * a locked dquot, doing an allocation (if requested) as needed.
608 * When both an inode and an id are given, the inode's id takes precedence.
609 * That is, if the id changes while we don't hold the ilock inside this
610 * function, the new dquot is returned, not necessarily the one requested
611 * in the id argument.
616 xfs_inode_t *ip, /* locked inode (optional) */
617 xfs_dqid_t id, /* uid/projid/gid depending on type */
618 uint type, /* XFS_DQ_USER/XFS_DQ_PROJ/XFS_DQ_GROUP */
619 uint flags, /* DQALLOC, DQSUSER, DQREPAIR, DOWARN */
620 xfs_dquot_t **O_dqpp) /* OUT : locked incore dquot */
622 struct xfs_quotainfo *qi = mp->m_quotainfo;
623 struct radix_tree_root *tree = XFS_DQUOT_TREE(qi, type);
624 struct xfs_dquot *dqp;
627 ASSERT(XFS_IS_QUOTA_RUNNING(mp));
628 if ((! XFS_IS_UQUOTA_ON(mp) && type == XFS_DQ_USER) ||
629 (! XFS_IS_PQUOTA_ON(mp) && type == XFS_DQ_PROJ) ||
630 (! XFS_IS_GQUOTA_ON(mp) && type == XFS_DQ_GROUP)) {
635 if (xfs_do_dqerror) {
636 if ((xfs_dqerror_target == mp->m_ddev_targp) &&
637 (xfs_dqreq_num++ % xfs_dqerror_mod) == 0) {
638 xfs_debug(mp, "Returning error in dqget");
643 ASSERT(type == XFS_DQ_USER ||
644 type == XFS_DQ_PROJ ||
645 type == XFS_DQ_GROUP);
647 ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
648 ASSERT(xfs_inode_dquot(ip, type) == NULL);
653 mutex_lock(&qi->qi_tree_lock);
654 dqp = radix_tree_lookup(tree, id);
657 if (dqp->dq_flags & XFS_DQ_FREEING) {
659 mutex_unlock(&qi->qi_tree_lock);
660 trace_xfs_dqget_freeing(dqp);
666 mutex_unlock(&qi->qi_tree_lock);
668 trace_xfs_dqget_hit(dqp);
669 XFS_STATS_INC(xs_qm_dqcachehits);
673 mutex_unlock(&qi->qi_tree_lock);
674 XFS_STATS_INC(xs_qm_dqcachemisses);
677 * Dquot cache miss. We don't want to keep the inode lock across
678 * a (potential) disk read. Also we don't want to deal with the lock
679 * ordering between quotainode and this inode. OTOH, dropping the inode
680 * lock here means dealing with a chown that can happen before
681 * we re-acquire the lock.
684 xfs_iunlock(ip, XFS_ILOCK_EXCL);
686 error = xfs_qm_dqread(mp, id, type, flags, &dqp);
689 xfs_ilock(ip, XFS_ILOCK_EXCL);
696 * A dquot could be attached to this inode by now, since
697 * we had dropped the ilock.
699 if (xfs_this_quota_on(mp, type)) {
700 struct xfs_dquot *dqp1;
702 dqp1 = xfs_inode_dquot(ip, type);
704 xfs_qm_dqdestroy(dqp);
710 /* inode stays locked on return */
711 xfs_qm_dqdestroy(dqp);
712 return XFS_ERROR(ESRCH);
716 mutex_lock(&qi->qi_tree_lock);
717 error = -radix_tree_insert(tree, id, dqp);
718 if (unlikely(error)) {
719 WARN_ON(error != EEXIST);
722 * Duplicate found. Just throw away the new dquot and start
725 mutex_unlock(&qi->qi_tree_lock);
726 trace_xfs_dqget_dup(dqp);
727 xfs_qm_dqdestroy(dqp);
728 XFS_STATS_INC(xs_qm_dquot_dups);
733 * We return a locked dquot to the caller, with a reference taken
739 mutex_unlock(&qi->qi_tree_lock);
742 ASSERT((ip == NULL) || xfs_isilocked(ip, XFS_ILOCK_EXCL));
743 trace_xfs_dqget_miss(dqp);
751 struct xfs_dquot *dqp)
753 struct xfs_quotainfo *qi = dqp->q_mount->m_quotainfo;
754 struct xfs_dquot *gdqp;
756 trace_xfs_dqput_free(dqp);
758 mutex_lock(&qi->qi_lru_lock);
759 if (list_empty(&dqp->q_lru)) {
760 list_add_tail(&dqp->q_lru, &qi->qi_lru_list);
762 XFS_STATS_INC(xs_qm_dquot_unused);
764 mutex_unlock(&qi->qi_lru_lock);
767 * If we just added a udquot to the freelist, then we want to release
768 * the gdquot reference that it (probably) has. Otherwise it'll keep
769 * the gdquot from getting reclaimed.
771 gdqp = dqp->q_gdquot;
774 dqp->q_gdquot = NULL;
779 * If we had a group quota hint, release it now.
786 * Release a reference to the dquot (decrement ref-count) and unlock it.
788 * If there is a group quota attached to this dquot, carefully release that
789 * too without tripping over deadlocks'n'stuff.
793 struct xfs_dquot *dqp)
795 ASSERT(dqp->q_nrefs > 0);
796 ASSERT(XFS_DQ_IS_LOCKED(dqp));
798 trace_xfs_dqput(dqp);
800 if (--dqp->q_nrefs > 0)
803 xfs_qm_dqput_final(dqp);
807 * Release a dquot. Flush it if dirty, then dqput() it.
808 * dquot must not be locked.
817 trace_xfs_dqrele(dqp);
821 * We don't care to flush it if the dquot is dirty here.
822 * That will create stutters that we want to avoid.
823 * Instead we do a delayed write when we try to reclaim
824 * a dirty dquot. Also xfs_sync will take part of the burden...
830 * This is the dquot flushing I/O completion routine. It is called
831 * from interrupt level when the buffer containing the dquot is
832 * flushed to disk. It is responsible for removing the dquot logitem
833 * from the AIL if it has not been re-logged, and unlocking the dquot's
834 * flush lock. This behavior is very similar to that of inodes..
839 struct xfs_log_item *lip)
841 xfs_dq_logitem_t *qip = (struct xfs_dq_logitem *)lip;
842 xfs_dquot_t *dqp = qip->qli_dquot;
843 struct xfs_ail *ailp = lip->li_ailp;
846 * We only want to pull the item from the AIL if its
847 * location in the log has not changed since we started the flush.
848 * Thus, we only bother if the dquot's lsn has
849 * not changed. First we check the lsn outside the lock
850 * since it's cheaper, and then we recheck while
851 * holding the lock before removing the dquot from the AIL.
853 if ((lip->li_flags & XFS_LI_IN_AIL) &&
854 lip->li_lsn == qip->qli_flush_lsn) {
856 /* xfs_trans_ail_delete() drops the AIL lock. */
857 spin_lock(&ailp->xa_lock);
858 if (lip->li_lsn == qip->qli_flush_lsn)
859 xfs_trans_ail_delete(ailp, lip, SHUTDOWN_CORRUPT_INCORE);
861 spin_unlock(&ailp->xa_lock);
865 * Release the dq's flush lock since we're done with it.
871 * Write a modified dquot to disk.
872 * The dquot must be locked and the flush lock too taken by caller.
873 * The flush lock will not be unlocked until the dquot reaches the disk,
874 * but the dquot is free to be unlocked and modified by the caller
875 * in the interim. Dquot is still locked on return. This behavior is
876 * identical to that of inodes.
880 struct xfs_dquot *dqp,
881 struct xfs_buf **bpp)
883 struct xfs_mount *mp = dqp->q_mount;
885 struct xfs_disk_dquot *ddqp;
888 ASSERT(XFS_DQ_IS_LOCKED(dqp));
889 ASSERT(!completion_done(&dqp->q_flush));
891 trace_xfs_dqflush(dqp);
895 xfs_qm_dqunpin_wait(dqp);
898 * This may have been unpinned because the filesystem is shutting
899 * down forcibly. If that's the case we must not write this dquot
900 * to disk, because the log record didn't make it to disk.
902 * We also have to remove the log item from the AIL in this case,
903 * as we wait for an emptry AIL as part of the unmount process.
905 if (XFS_FORCED_SHUTDOWN(mp)) {
906 struct xfs_log_item *lip = &dqp->q_logitem.qli_item;
907 dqp->dq_flags &= ~XFS_DQ_DIRTY;
909 spin_lock(&mp->m_ail->xa_lock);
910 if (lip->li_flags & XFS_LI_IN_AIL)
911 xfs_trans_ail_delete(mp->m_ail, lip,
912 SHUTDOWN_CORRUPT_INCORE);
914 spin_unlock(&mp->m_ail->xa_lock);
915 error = XFS_ERROR(EIO);
920 * Get the buffer containing the on-disk dquot
922 error = xfs_trans_read_buf(mp, NULL, mp->m_ddev_targp, dqp->q_blkno,
923 mp->m_quotainfo->qi_dqchunklen, 0, &bp, NULL);
928 * Calculate the location of the dquot inside the buffer.
930 ddqp = bp->b_addr + dqp->q_bufoffset;
933 * A simple sanity check in case we got a corrupted dquot..
935 error = xfs_qm_dqcheck(mp, &dqp->q_core, be32_to_cpu(ddqp->d_id), 0,
936 XFS_QMOPT_DOWARN, "dqflush (incore copy)");
940 xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE);
941 return XFS_ERROR(EIO);
944 /* This is the only portion of data that needs to persist */
945 memcpy(ddqp, &dqp->q_core, sizeof(xfs_disk_dquot_t));
948 * Clear the dirty field and remember the flush lsn for later use.
950 dqp->dq_flags &= ~XFS_DQ_DIRTY;
952 xfs_trans_ail_copy_lsn(mp->m_ail, &dqp->q_logitem.qli_flush_lsn,
953 &dqp->q_logitem.qli_item.li_lsn);
956 * Attach an iodone routine so that we can remove this dquot from the
957 * AIL and release the flush lock once the dquot is synced to disk.
959 xfs_buf_attach_iodone(bp, xfs_qm_dqflush_done,
960 &dqp->q_logitem.qli_item);
963 * If the buffer is pinned then push on the log so we won't
964 * get stuck waiting in the write for too long.
966 if (xfs_buf_ispinned(bp)) {
967 trace_xfs_dqflush_force(dqp);
968 xfs_log_force(mp, 0);
971 trace_xfs_dqflush_done(dqp);
977 return XFS_ERROR(EIO);
981 * Lock two xfs_dquot structures.
983 * To avoid deadlocks we always lock the quota structure with
984 * the lowerd id first.
993 if (be32_to_cpu(d1->q_core.d_id) >
994 be32_to_cpu(d2->q_core.d_id)) {
995 mutex_lock(&d2->q_qlock);
996 mutex_lock_nested(&d1->q_qlock, XFS_QLOCK_NESTED);
998 mutex_lock(&d1->q_qlock);
999 mutex_lock_nested(&d2->q_qlock, XFS_QLOCK_NESTED);
1002 mutex_lock(&d1->q_qlock);
1004 mutex_lock(&d2->q_qlock);
1012 kmem_zone_init(sizeof(struct xfs_dquot), "xfs_dquot");
1017 kmem_zone_init(sizeof(struct xfs_dquot_acct), "xfs_dqtrx");
1018 if (!xfs_qm_dqtrxzone)
1019 goto out_free_dqzone;
1024 kmem_zone_destroy(xfs_qm_dqzone);
1032 kmem_zone_destroy(xfs_qm_dqtrxzone);
1033 kmem_zone_destroy(xfs_qm_dqzone);