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
);
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
);