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 struct xfs_quotainfo *q = mp->m_quotainfo;
92 struct xfs_disk_dquot *d = &dq->q_core;
97 if (q->qi_bsoftlimit && !d->d_blk_softlimit) {
98 d->d_blk_softlimit = cpu_to_be64(q->qi_bsoftlimit);
101 if (q->qi_bhardlimit && !d->d_blk_hardlimit) {
102 d->d_blk_hardlimit = cpu_to_be64(q->qi_bhardlimit);
105 if (q->qi_isoftlimit && !d->d_ino_softlimit)
106 d->d_ino_softlimit = cpu_to_be64(q->qi_isoftlimit);
107 if (q->qi_ihardlimit && !d->d_ino_hardlimit)
108 d->d_ino_hardlimit = cpu_to_be64(q->qi_ihardlimit);
109 if (q->qi_rtbsoftlimit && !d->d_rtb_softlimit)
110 d->d_rtb_softlimit = cpu_to_be64(q->qi_rtbsoftlimit);
111 if (q->qi_rtbhardlimit && !d->d_rtb_hardlimit)
112 d->d_rtb_hardlimit = cpu_to_be64(q->qi_rtbhardlimit);
115 xfs_dquot_set_prealloc_limits(dq);
119 * Check the limits and timers of a dquot and start or reset timers
121 * This gets called even when quota enforcement is OFF, which makes our
122 * life a little less complicated. (We just don't reject any quota
123 * reservations in that case, when enforcement is off).
124 * We also return 0 as the values of the timers in Q_GETQUOTA calls, when
126 * In contrast, warnings are a little different in that they don't
127 * 'automatically' get started when limits get exceeded. They do
128 * get reset to zero, however, when we find the count to be under
129 * the soft limit (they are only ever set non-zero via userspace).
132 xfs_qm_adjust_dqtimers(
139 if (d->d_blk_hardlimit)
140 ASSERT(be64_to_cpu(d->d_blk_softlimit) <=
141 be64_to_cpu(d->d_blk_hardlimit));
142 if (d->d_ino_hardlimit)
143 ASSERT(be64_to_cpu(d->d_ino_softlimit) <=
144 be64_to_cpu(d->d_ino_hardlimit));
145 if (d->d_rtb_hardlimit)
146 ASSERT(be64_to_cpu(d->d_rtb_softlimit) <=
147 be64_to_cpu(d->d_rtb_hardlimit));
151 if ((d->d_blk_softlimit &&
152 (be64_to_cpu(d->d_bcount) >
153 be64_to_cpu(d->d_blk_softlimit))) ||
154 (d->d_blk_hardlimit &&
155 (be64_to_cpu(d->d_bcount) >
156 be64_to_cpu(d->d_blk_hardlimit)))) {
157 d->d_btimer = cpu_to_be32(get_seconds() +
158 mp->m_quotainfo->qi_btimelimit);
163 if ((!d->d_blk_softlimit ||
164 (be64_to_cpu(d->d_bcount) <=
165 be64_to_cpu(d->d_blk_softlimit))) &&
166 (!d->d_blk_hardlimit ||
167 (be64_to_cpu(d->d_bcount) <=
168 be64_to_cpu(d->d_blk_hardlimit)))) {
174 if ((d->d_ino_softlimit &&
175 (be64_to_cpu(d->d_icount) >
176 be64_to_cpu(d->d_ino_softlimit))) ||
177 (d->d_ino_hardlimit &&
178 (be64_to_cpu(d->d_icount) >
179 be64_to_cpu(d->d_ino_hardlimit)))) {
180 d->d_itimer = cpu_to_be32(get_seconds() +
181 mp->m_quotainfo->qi_itimelimit);
186 if ((!d->d_ino_softlimit ||
187 (be64_to_cpu(d->d_icount) <=
188 be64_to_cpu(d->d_ino_softlimit))) &&
189 (!d->d_ino_hardlimit ||
190 (be64_to_cpu(d->d_icount) <=
191 be64_to_cpu(d->d_ino_hardlimit)))) {
196 if (!d->d_rtbtimer) {
197 if ((d->d_rtb_softlimit &&
198 (be64_to_cpu(d->d_rtbcount) >
199 be64_to_cpu(d->d_rtb_softlimit))) ||
200 (d->d_rtb_hardlimit &&
201 (be64_to_cpu(d->d_rtbcount) >
202 be64_to_cpu(d->d_rtb_hardlimit)))) {
203 d->d_rtbtimer = cpu_to_be32(get_seconds() +
204 mp->m_quotainfo->qi_rtbtimelimit);
209 if ((!d->d_rtb_softlimit ||
210 (be64_to_cpu(d->d_rtbcount) <=
211 be64_to_cpu(d->d_rtb_softlimit))) &&
212 (!d->d_rtb_hardlimit ||
213 (be64_to_cpu(d->d_rtbcount) <=
214 be64_to_cpu(d->d_rtb_hardlimit)))) {
221 * initialize a buffer full of dquots and log the whole thing
224 xfs_qm_init_dquot_blk(
231 struct xfs_quotainfo *q = mp->m_quotainfo;
236 ASSERT(xfs_buf_islocked(bp));
241 * ID of the first dquot in the block - id's are zero based.
243 curid = id - (id % q->qi_dqperchunk);
245 memset(d, 0, BBTOB(q->qi_dqchunklen));
246 for (i = 0; i < q->qi_dqperchunk; i++, d++, curid++) {
247 d->dd_diskdq.d_magic = cpu_to_be16(XFS_DQUOT_MAGIC);
248 d->dd_diskdq.d_version = XFS_DQUOT_VERSION;
249 d->dd_diskdq.d_id = cpu_to_be32(curid);
250 d->dd_diskdq.d_flags = type;
253 xfs_trans_dquot_buf(tp, bp,
254 (type & XFS_DQ_USER ? XFS_BLF_UDQUOT_BUF :
255 ((type & XFS_DQ_PROJ) ? XFS_BLF_PDQUOT_BUF :
256 XFS_BLF_GDQUOT_BUF)));
257 xfs_trans_log_buf(tp, bp, 0, BBTOB(q->qi_dqchunklen) - 1);
261 * Initialize the dynamic speculative preallocation thresholds. The lo/hi
262 * watermarks correspond to the soft and hard limits by default. If a soft limit
263 * is not specified, we use 95% of the hard limit.
266 xfs_dquot_set_prealloc_limits(struct xfs_dquot *dqp)
270 dqp->q_prealloc_hi_wmark = be64_to_cpu(dqp->q_core.d_blk_hardlimit);
271 dqp->q_prealloc_lo_wmark = be64_to_cpu(dqp->q_core.d_blk_softlimit);
272 if (!dqp->q_prealloc_lo_wmark) {
273 dqp->q_prealloc_lo_wmark = dqp->q_prealloc_hi_wmark;
274 do_div(dqp->q_prealloc_lo_wmark, 100);
275 dqp->q_prealloc_lo_wmark *= 95;
278 space = dqp->q_prealloc_hi_wmark;
281 dqp->q_low_space[XFS_QLOWSP_1_PCNT] = space;
282 dqp->q_low_space[XFS_QLOWSP_3_PCNT] = space * 3;
283 dqp->q_low_space[XFS_QLOWSP_5_PCNT] = space * 5;
287 xfs_dquot_buf_verify(
290 struct xfs_mount *mp = bp->b_target->bt_mount;
291 struct xfs_dqblk *d = (struct xfs_dqblk *)bp->b_addr;
292 struct xfs_disk_dquot *ddq;
297 * On the first read of the buffer, verify that each dquot is valid.
298 * We don't know what the id of the dquot is supposed to be, just that
299 * they should be increasing monotonically within the buffer. If the
300 * first id is corrupt, then it will fail on the second dquot in the
301 * buffer so corruptions could point to the wrong dquot in this case.
303 for (i = 0; i < mp->m_quotainfo->qi_dqperchunk; i++) {
306 ddq = &d[i].dd_diskdq;
309 id = be32_to_cpu(ddq->d_id);
311 error = xfs_qm_dqcheck(mp, ddq, id + i, 0, XFS_QMOPT_DOWARN,
312 "xfs_dquot_read_verify");
314 XFS_CORRUPTION_ERROR(__func__, XFS_ERRLEVEL_LOW, mp, d);
315 xfs_buf_ioerror(bp, EFSCORRUPTED);
322 xfs_dquot_buf_read_verify(
325 xfs_dquot_buf_verify(bp);
329 xfs_dquot_buf_write_verify(
332 xfs_dquot_buf_verify(bp);
335 const struct xfs_buf_ops xfs_dquot_buf_ops = {
336 .verify_read = xfs_dquot_buf_read_verify,
337 .verify_write = xfs_dquot_buf_write_verify,
341 * Allocate a block and fill it with dquots.
342 * This is called when the bmapi finds a hole.
350 xfs_fileoff_t offset_fsb,
353 xfs_fsblock_t firstblock;
354 xfs_bmap_free_t flist;
356 int nmaps, error, committed;
358 xfs_trans_t *tp = *tpp;
362 trace_xfs_dqalloc(dqp);
365 * Initialize the bmap freelist prior to calling bmapi code.
367 xfs_bmap_init(&flist, &firstblock);
368 xfs_ilock(quotip, XFS_ILOCK_EXCL);
370 * Return if this type of quotas is turned off while we didn't
373 if (!xfs_this_quota_on(dqp->q_mount, dqp->dq_flags)) {
374 xfs_iunlock(quotip, XFS_ILOCK_EXCL);
378 xfs_trans_ijoin(tp, quotip, XFS_ILOCK_EXCL);
380 error = xfs_bmapi_write(tp, quotip, offset_fsb,
381 XFS_DQUOT_CLUSTER_SIZE_FSB, XFS_BMAPI_METADATA,
382 &firstblock, XFS_QM_DQALLOC_SPACE_RES(mp),
383 &map, &nmaps, &flist);
386 ASSERT(map.br_blockcount == XFS_DQUOT_CLUSTER_SIZE_FSB);
388 ASSERT((map.br_startblock != DELAYSTARTBLOCK) &&
389 (map.br_startblock != HOLESTARTBLOCK));
392 * Keep track of the blkno to save a lookup later
394 dqp->q_blkno = XFS_FSB_TO_DADDR(mp, map.br_startblock);
396 /* now we can just get the buffer (there's nothing to read yet) */
397 bp = xfs_trans_get_buf(tp, mp->m_ddev_targp,
399 mp->m_quotainfo->qi_dqchunklen,
402 error = xfs_buf_geterror(bp);
405 bp->b_ops = &xfs_dquot_buf_ops;
408 * Make a chunk of dquots out of this buffer and log
411 xfs_qm_init_dquot_blk(tp, mp, be32_to_cpu(dqp->q_core.d_id),
412 dqp->dq_flags & XFS_DQ_ALLTYPES, bp);
415 * xfs_bmap_finish() may commit the current transaction and
416 * start a second transaction if the freelist is not empty.
418 * Since we still want to modify this buffer, we need to
419 * ensure that the buffer is not released on commit of
420 * the first transaction and ensure the buffer is added to the
421 * second transaction.
423 * If there is only one transaction then don't stop the buffer
424 * from being released when it commits later on.
427 xfs_trans_bhold(tp, bp);
429 if ((error = xfs_bmap_finish(tpp, &flist, &committed))) {
435 xfs_trans_bjoin(tp, bp);
437 xfs_trans_bhold_release(tp, bp);
444 xfs_bmap_cancel(&flist);
446 xfs_iunlock(quotip, XFS_ILOCK_EXCL);
452 struct xfs_mount *mp,
453 struct xfs_trans *tp,
454 struct xfs_dquot *dqp,
456 struct xfs_buf **bpp)
459 struct xfs_disk_dquot *ddq;
464 * Read the buffer without verification so we get the corrupted
465 * buffer returned to us. make sure we verify it on write, though.
467 error = xfs_trans_read_buf(mp, tp, mp->m_ddev_targp, dqp->q_blkno,
468 mp->m_quotainfo->qi_dqchunklen,
472 ASSERT(*bpp == NULL);
473 return XFS_ERROR(error);
475 (*bpp)->b_ops = &xfs_dquot_buf_ops;
477 ASSERT(xfs_buf_islocked(*bpp));
478 d = (struct xfs_dqblk *)(*bpp)->b_addr;
480 /* Do the actual repair of dquots in this buffer */
481 for (i = 0; i < mp->m_quotainfo->qi_dqperchunk; i++) {
482 ddq = &d[i].dd_diskdq;
483 error = xfs_qm_dqcheck(mp, ddq, firstid + i,
484 dqp->dq_flags & XFS_DQ_ALLTYPES,
485 XFS_QMOPT_DQREPAIR, "xfs_qm_dqrepair");
487 /* repair failed, we're screwed */
488 xfs_trans_brelse(tp, *bpp);
489 return XFS_ERROR(EIO);
497 * Maps a dquot to the buffer containing its on-disk version.
498 * This returns a ptr to the buffer containing the on-disk dquot
499 * in the bpp param, and a ptr to the on-disk dquot within that buffer
505 xfs_disk_dquot_t **O_ddpp,
510 int nmaps = 1, error;
512 xfs_inode_t *quotip = XFS_DQ_TO_QIP(dqp);
513 xfs_mount_t *mp = dqp->q_mount;
514 xfs_dqid_t id = be32_to_cpu(dqp->q_core.d_id);
515 xfs_trans_t *tp = (tpp ? *tpp : NULL);
517 dqp->q_fileoffset = (xfs_fileoff_t)id / mp->m_quotainfo->qi_dqperchunk;
519 xfs_ilock(quotip, XFS_ILOCK_SHARED);
520 if (!xfs_this_quota_on(dqp->q_mount, dqp->dq_flags)) {
522 * Return if this type of quotas is turned off while we
523 * didn't have the quota inode lock.
525 xfs_iunlock(quotip, XFS_ILOCK_SHARED);
530 * Find the block map; no allocations yet
532 error = xfs_bmapi_read(quotip, dqp->q_fileoffset,
533 XFS_DQUOT_CLUSTER_SIZE_FSB, &map, &nmaps, 0);
535 xfs_iunlock(quotip, XFS_ILOCK_SHARED);
540 ASSERT(map.br_blockcount == 1);
543 * Offset of dquot in the (fixed sized) dquot chunk.
545 dqp->q_bufoffset = (id % mp->m_quotainfo->qi_dqperchunk) *
548 ASSERT(map.br_startblock != DELAYSTARTBLOCK);
549 if (map.br_startblock == HOLESTARTBLOCK) {
551 * We don't allocate unless we're asked to
553 if (!(flags & XFS_QMOPT_DQALLOC))
557 error = xfs_qm_dqalloc(tpp, mp, dqp, quotip,
558 dqp->q_fileoffset, &bp);
563 trace_xfs_dqtobp_read(dqp);
566 * store the blkno etc so that we don't have to do the
567 * mapping all the time
569 dqp->q_blkno = XFS_FSB_TO_DADDR(mp, map.br_startblock);
571 error = xfs_trans_read_buf(mp, tp, mp->m_ddev_targp,
573 mp->m_quotainfo->qi_dqchunklen,
574 0, &bp, &xfs_dquot_buf_ops);
576 if (error == EFSCORRUPTED && (flags & XFS_QMOPT_DQREPAIR)) {
577 xfs_dqid_t firstid = (xfs_dqid_t)map.br_startoff *
578 mp->m_quotainfo->qi_dqperchunk;
580 error = xfs_qm_dqrepair(mp, tp, dqp, firstid, &bp);
585 return XFS_ERROR(error);
589 ASSERT(xfs_buf_islocked(bp));
591 *O_ddpp = bp->b_addr + dqp->q_bufoffset;
598 * Read in the ondisk dquot using dqtobp() then copy it to an incore version,
599 * and release the buffer immediately.
601 * If XFS_QMOPT_DQALLOC is set, allocate a dquot on disk if it needed.
605 struct xfs_mount *mp,
609 struct xfs_dquot **O_dqpp)
611 struct xfs_dquot *dqp;
612 struct xfs_disk_dquot *ddqp;
614 struct xfs_trans *tp = NULL;
619 dqp = kmem_zone_zalloc(xfs_qm_dqzone, KM_SLEEP);
621 dqp->dq_flags = type;
622 dqp->q_core.d_id = cpu_to_be32(id);
624 INIT_LIST_HEAD(&dqp->q_lru);
625 mutex_init(&dqp->q_qlock);
626 init_waitqueue_head(&dqp->q_pinwait);
629 * Because we want to use a counting completion, complete
630 * the flush completion once to allow a single access to
631 * the flush completion without blocking.
633 init_completion(&dqp->q_flush);
634 complete(&dqp->q_flush);
637 * Make sure group quotas have a different lock class than user
640 if (!(type & XFS_DQ_USER))
641 lockdep_set_class(&dqp->q_qlock, &xfs_dquot_other_class);
643 XFS_STATS_INC(xs_qm_dquot);
645 trace_xfs_dqread(dqp);
647 if (flags & XFS_QMOPT_DQALLOC) {
648 tp = xfs_trans_alloc(mp, XFS_TRANS_QM_DQALLOC);
649 error = xfs_trans_reserve(tp, XFS_QM_DQALLOC_SPACE_RES(mp),
650 XFS_QM_DQALLOC_LOG_RES(mp), 0,
651 XFS_TRANS_PERM_LOG_RES,
652 XFS_WRITE_LOG_COUNT);
655 cancelflags = XFS_TRANS_RELEASE_LOG_RES;
659 * get a pointer to the on-disk dquot and the buffer containing it
660 * dqp already knows its own type (GROUP/USER).
662 error = xfs_qm_dqtobp(&tp, dqp, &ddqp, &bp, flags);
665 * This can happen if quotas got turned off (ESRCH),
666 * or if the dquot didn't exist on disk and we ask to
669 trace_xfs_dqread_fail(dqp);
670 cancelflags |= XFS_TRANS_ABORT;
674 /* copy everything from disk dquot to the incore dquot */
675 memcpy(&dqp->q_core, ddqp, sizeof(xfs_disk_dquot_t));
676 xfs_qm_dquot_logitem_init(dqp);
679 * Reservation counters are defined as reservation plus current usage
680 * to avoid having to add every time.
682 dqp->q_res_bcount = be64_to_cpu(ddqp->d_bcount);
683 dqp->q_res_icount = be64_to_cpu(ddqp->d_icount);
684 dqp->q_res_rtbcount = be64_to_cpu(ddqp->d_rtbcount);
686 /* initialize the dquot speculative prealloc thresholds */
687 xfs_dquot_set_prealloc_limits(dqp);
689 /* Mark the buf so that this will stay incore a little longer */
690 xfs_buf_set_ref(bp, XFS_DQUOT_REF);
693 * We got the buffer with a xfs_trans_read_buf() (in dqtobp())
694 * So we need to release with xfs_trans_brelse().
695 * The strategy here is identical to that of inodes; we lock
696 * the dquot in xfs_qm_dqget() before making it accessible to
697 * others. This is because dquots, like inodes, need a good level of
698 * concurrency, and we don't want to take locks on the entire buffers
699 * for dquot accesses.
700 * Note also that the dquot buffer may even be dirty at this point, if
701 * this particular dquot was repaired. We still aren't afraid to
702 * brelse it because we have the changes incore.
704 ASSERT(xfs_buf_islocked(bp));
705 xfs_trans_brelse(tp, bp);
708 error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES);
718 xfs_trans_cancel(tp, cancelflags);
720 xfs_qm_dqdestroy(dqp);
726 * Given the file system, inode OR id, and type (UDQUOT/GDQUOT), return a
727 * a locked dquot, doing an allocation (if requested) as needed.
728 * When both an inode and an id are given, the inode's id takes precedence.
729 * That is, if the id changes while we don't hold the ilock inside this
730 * function, the new dquot is returned, not necessarily the one requested
731 * in the id argument.
736 xfs_inode_t *ip, /* locked inode (optional) */
737 xfs_dqid_t id, /* uid/projid/gid depending on type */
738 uint type, /* XFS_DQ_USER/XFS_DQ_PROJ/XFS_DQ_GROUP */
739 uint flags, /* DQALLOC, DQSUSER, DQREPAIR, DOWARN */
740 xfs_dquot_t **O_dqpp) /* OUT : locked incore dquot */
742 struct xfs_quotainfo *qi = mp->m_quotainfo;
743 struct radix_tree_root *tree = XFS_DQUOT_TREE(qi, type);
744 struct xfs_dquot *dqp;
747 ASSERT(XFS_IS_QUOTA_RUNNING(mp));
748 if ((! XFS_IS_UQUOTA_ON(mp) && type == XFS_DQ_USER) ||
749 (! XFS_IS_PQUOTA_ON(mp) && type == XFS_DQ_PROJ) ||
750 (! XFS_IS_GQUOTA_ON(mp) && type == XFS_DQ_GROUP)) {
755 if (xfs_do_dqerror) {
756 if ((xfs_dqerror_target == mp->m_ddev_targp) &&
757 (xfs_dqreq_num++ % xfs_dqerror_mod) == 0) {
758 xfs_debug(mp, "Returning error in dqget");
763 ASSERT(type == XFS_DQ_USER ||
764 type == XFS_DQ_PROJ ||
765 type == XFS_DQ_GROUP);
767 ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
768 ASSERT(xfs_inode_dquot(ip, type) == NULL);
773 mutex_lock(&qi->qi_tree_lock);
774 dqp = radix_tree_lookup(tree, id);
777 if (dqp->dq_flags & XFS_DQ_FREEING) {
779 mutex_unlock(&qi->qi_tree_lock);
780 trace_xfs_dqget_freeing(dqp);
786 mutex_unlock(&qi->qi_tree_lock);
788 trace_xfs_dqget_hit(dqp);
789 XFS_STATS_INC(xs_qm_dqcachehits);
793 mutex_unlock(&qi->qi_tree_lock);
794 XFS_STATS_INC(xs_qm_dqcachemisses);
797 * Dquot cache miss. We don't want to keep the inode lock across
798 * a (potential) disk read. Also we don't want to deal with the lock
799 * ordering between quotainode and this inode. OTOH, dropping the inode
800 * lock here means dealing with a chown that can happen before
801 * we re-acquire the lock.
804 xfs_iunlock(ip, XFS_ILOCK_EXCL);
806 error = xfs_qm_dqread(mp, id, type, flags, &dqp);
809 xfs_ilock(ip, XFS_ILOCK_EXCL);
816 * A dquot could be attached to this inode by now, since
817 * we had dropped the ilock.
819 if (xfs_this_quota_on(mp, type)) {
820 struct xfs_dquot *dqp1;
822 dqp1 = xfs_inode_dquot(ip, type);
824 xfs_qm_dqdestroy(dqp);
830 /* inode stays locked on return */
831 xfs_qm_dqdestroy(dqp);
832 return XFS_ERROR(ESRCH);
836 mutex_lock(&qi->qi_tree_lock);
837 error = -radix_tree_insert(tree, id, dqp);
838 if (unlikely(error)) {
839 WARN_ON(error != EEXIST);
842 * Duplicate found. Just throw away the new dquot and start
845 mutex_unlock(&qi->qi_tree_lock);
846 trace_xfs_dqget_dup(dqp);
847 xfs_qm_dqdestroy(dqp);
848 XFS_STATS_INC(xs_qm_dquot_dups);
853 * We return a locked dquot to the caller, with a reference taken
859 mutex_unlock(&qi->qi_tree_lock);
862 ASSERT((ip == NULL) || xfs_isilocked(ip, XFS_ILOCK_EXCL));
863 trace_xfs_dqget_miss(dqp);
871 struct xfs_dquot *dqp)
873 struct xfs_quotainfo *qi = dqp->q_mount->m_quotainfo;
874 struct xfs_dquot *gdqp;
876 trace_xfs_dqput_free(dqp);
878 mutex_lock(&qi->qi_lru_lock);
879 if (list_empty(&dqp->q_lru)) {
880 list_add_tail(&dqp->q_lru, &qi->qi_lru_list);
882 XFS_STATS_INC(xs_qm_dquot_unused);
884 mutex_unlock(&qi->qi_lru_lock);
887 * If we just added a udquot to the freelist, then we want to release
888 * the gdquot reference that it (probably) has. Otherwise it'll keep
889 * the gdquot from getting reclaimed.
891 gdqp = dqp->q_gdquot;
894 dqp->q_gdquot = NULL;
899 * If we had a group quota hint, release it now.
906 * Release a reference to the dquot (decrement ref-count) and unlock it.
908 * If there is a group quota attached to this dquot, carefully release that
909 * too without tripping over deadlocks'n'stuff.
913 struct xfs_dquot *dqp)
915 ASSERT(dqp->q_nrefs > 0);
916 ASSERT(XFS_DQ_IS_LOCKED(dqp));
918 trace_xfs_dqput(dqp);
920 if (--dqp->q_nrefs > 0)
923 xfs_qm_dqput_final(dqp);
927 * Release a dquot. Flush it if dirty, then dqput() it.
928 * dquot must not be locked.
937 trace_xfs_dqrele(dqp);
941 * We don't care to flush it if the dquot is dirty here.
942 * That will create stutters that we want to avoid.
943 * Instead we do a delayed write when we try to reclaim
944 * a dirty dquot. Also xfs_sync will take part of the burden...
950 * This is the dquot flushing I/O completion routine. It is called
951 * from interrupt level when the buffer containing the dquot is
952 * flushed to disk. It is responsible for removing the dquot logitem
953 * from the AIL if it has not been re-logged, and unlocking the dquot's
954 * flush lock. This behavior is very similar to that of inodes..
959 struct xfs_log_item *lip)
961 xfs_dq_logitem_t *qip = (struct xfs_dq_logitem *)lip;
962 xfs_dquot_t *dqp = qip->qli_dquot;
963 struct xfs_ail *ailp = lip->li_ailp;
966 * We only want to pull the item from the AIL if its
967 * location in the log has not changed since we started the flush.
968 * Thus, we only bother if the dquot's lsn has
969 * not changed. First we check the lsn outside the lock
970 * since it's cheaper, and then we recheck while
971 * holding the lock before removing the dquot from the AIL.
973 if ((lip->li_flags & XFS_LI_IN_AIL) &&
974 lip->li_lsn == qip->qli_flush_lsn) {
976 /* xfs_trans_ail_delete() drops the AIL lock. */
977 spin_lock(&ailp->xa_lock);
978 if (lip->li_lsn == qip->qli_flush_lsn)
979 xfs_trans_ail_delete(ailp, lip, SHUTDOWN_CORRUPT_INCORE);
981 spin_unlock(&ailp->xa_lock);
985 * Release the dq's flush lock since we're done with it.
991 * Write a modified dquot to disk.
992 * The dquot must be locked and the flush lock too taken by caller.
993 * The flush lock will not be unlocked until the dquot reaches the disk,
994 * but the dquot is free to be unlocked and modified by the caller
995 * in the interim. Dquot is still locked on return. This behavior is
996 * identical to that of inodes.
1000 struct xfs_dquot *dqp,
1001 struct xfs_buf **bpp)
1003 struct xfs_mount *mp = dqp->q_mount;
1005 struct xfs_disk_dquot *ddqp;
1008 ASSERT(XFS_DQ_IS_LOCKED(dqp));
1009 ASSERT(!completion_done(&dqp->q_flush));
1011 trace_xfs_dqflush(dqp);
1015 xfs_qm_dqunpin_wait(dqp);
1018 * This may have been unpinned because the filesystem is shutting
1019 * down forcibly. If that's the case we must not write this dquot
1020 * to disk, because the log record didn't make it to disk.
1022 * We also have to remove the log item from the AIL in this case,
1023 * as we wait for an emptry AIL as part of the unmount process.
1025 if (XFS_FORCED_SHUTDOWN(mp)) {
1026 struct xfs_log_item *lip = &dqp->q_logitem.qli_item;
1027 dqp->dq_flags &= ~XFS_DQ_DIRTY;
1029 spin_lock(&mp->m_ail->xa_lock);
1030 if (lip->li_flags & XFS_LI_IN_AIL)
1031 xfs_trans_ail_delete(mp->m_ail, lip,
1032 SHUTDOWN_CORRUPT_INCORE);
1034 spin_unlock(&mp->m_ail->xa_lock);
1035 error = XFS_ERROR(EIO);
1040 * Get the buffer containing the on-disk dquot
1042 error = xfs_trans_read_buf(mp, NULL, mp->m_ddev_targp, dqp->q_blkno,
1043 mp->m_quotainfo->qi_dqchunklen, 0, &bp, NULL);
1048 * Calculate the location of the dquot inside the buffer.
1050 ddqp = bp->b_addr + dqp->q_bufoffset;
1053 * A simple sanity check in case we got a corrupted dquot..
1055 error = xfs_qm_dqcheck(mp, &dqp->q_core, be32_to_cpu(ddqp->d_id), 0,
1056 XFS_QMOPT_DOWARN, "dqflush (incore copy)");
1060 xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE);
1061 return XFS_ERROR(EIO);
1064 /* This is the only portion of data that needs to persist */
1065 memcpy(ddqp, &dqp->q_core, sizeof(xfs_disk_dquot_t));
1068 * Clear the dirty field and remember the flush lsn for later use.
1070 dqp->dq_flags &= ~XFS_DQ_DIRTY;
1072 xfs_trans_ail_copy_lsn(mp->m_ail, &dqp->q_logitem.qli_flush_lsn,
1073 &dqp->q_logitem.qli_item.li_lsn);
1076 * Attach an iodone routine so that we can remove this dquot from the
1077 * AIL and release the flush lock once the dquot is synced to disk.
1079 xfs_buf_attach_iodone(bp, xfs_qm_dqflush_done,
1080 &dqp->q_logitem.qli_item);
1083 * If the buffer is pinned then push on the log so we won't
1084 * get stuck waiting in the write for too long.
1086 if (xfs_buf_ispinned(bp)) {
1087 trace_xfs_dqflush_force(dqp);
1088 xfs_log_force(mp, 0);
1091 trace_xfs_dqflush_done(dqp);
1097 return XFS_ERROR(EIO);
1101 * Lock two xfs_dquot structures.
1103 * To avoid deadlocks we always lock the quota structure with
1104 * the lowerd id first.
1113 if (be32_to_cpu(d1->q_core.d_id) >
1114 be32_to_cpu(d2->q_core.d_id)) {
1115 mutex_lock(&d2->q_qlock);
1116 mutex_lock_nested(&d1->q_qlock, XFS_QLOCK_NESTED);
1118 mutex_lock(&d1->q_qlock);
1119 mutex_lock_nested(&d2->q_qlock, XFS_QLOCK_NESTED);
1122 mutex_lock(&d1->q_qlock);
1124 mutex_lock(&d2->q_qlock);
1132 kmem_zone_init(sizeof(struct xfs_dquot), "xfs_dquot");
1137 kmem_zone_init(sizeof(struct xfs_dquot_acct), "xfs_dqtrx");
1138 if (!xfs_qm_dqtrxzone)
1139 goto out_free_dqzone;
1144 kmem_zone_destroy(xfs_qm_dqzone);
1152 kmem_zone_destroy(xfs_qm_dqtrxzone);
1153 kmem_zone_destroy(xfs_qm_dqzone);