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
23 #include "xfs_trans.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_inode.h"
32 #include "xfs_rtalloc.h"
33 #include "xfs_error.h"
34 #include "xfs_itable.h"
36 #include "xfs_buf_item.h"
37 #include "xfs_trans_space.h"
38 #include "xfs_trans_priv.h"
40 #include "xfs_trace.h"
47 dquot hash-chain lock (hashlock)
48 xqm dquot freelist lock (freelistlock
49 mount's dquot list lock (mplistlock)
50 user dquot lock - lock ordering among dquots is based on the uid or gid
51 group dquot lock - similar to udquots. Between the two dquots, the udquot
52 has to be locked first.
53 pin lock - the dquot lock must be held to take this lock.
58 xfs_buftarg_t *xfs_dqerror_target;
61 int xfs_dqerror_mod = 33;
64 static struct lock_class_key xfs_dquot_other_class;
67 * Allocate and initialize a dquot. We don't always allocate fresh memory;
68 * we try to reclaim a free dquot if the number of incore dquots are above
70 * The only field inside the core that gets initialized at this point
71 * is the d_id field. The idea is to fill in the entire q_core
72 * when we read in the on disk dquot.
81 boolean_t brandnewdquot;
83 brandnewdquot = xfs_qm_dqalloc_incore(&dqp);
85 dqp->q_core.d_id = cpu_to_be32(id);
89 * No need to re-initialize these if this is a reclaimed dquot.
92 INIT_LIST_HEAD(&dqp->q_freelist);
93 mutex_init(&dqp->q_qlock);
94 init_waitqueue_head(&dqp->q_pinwait);
97 * Because we want to use a counting completion, complete
98 * the flush completion once to allow a single access to
99 * the flush completion without blocking.
101 init_completion(&dqp->q_flush);
102 complete(&dqp->q_flush);
104 trace_xfs_dqinit(dqp);
107 * Only the q_core portion was zeroed in dqreclaim_one().
108 * So, we need to reset others.
112 INIT_LIST_HEAD(&dqp->q_mplist);
113 INIT_LIST_HEAD(&dqp->q_hashlist);
114 dqp->q_bufoffset = 0;
115 dqp->q_fileoffset = 0;
116 dqp->q_transp = NULL;
117 dqp->q_gdquot = NULL;
118 dqp->q_res_bcount = 0;
119 dqp->q_res_icount = 0;
120 dqp->q_res_rtbcount = 0;
121 atomic_set(&dqp->q_pincount, 0);
123 ASSERT(list_empty(&dqp->q_freelist));
125 trace_xfs_dqreuse(dqp);
129 * In either case we need to make sure group quotas have a different
130 * lock class than user quotas, to make sure lockdep knows we can
131 * locks of one of each at the same time.
133 if (!(type & XFS_DQ_USER))
134 lockdep_set_class(&dqp->q_qlock, &xfs_dquot_other_class);
137 * log item gets initialized later
143 * This is called to free all the memory associated with a dquot
149 ASSERT(list_empty(&dqp->q_freelist));
151 mutex_destroy(&dqp->q_qlock);
152 kmem_zone_free(xfs_Gqm->qm_dqzone, dqp);
154 atomic_dec(&xfs_Gqm->qm_totaldquots);
158 * This is what a 'fresh' dquot inside a dquot chunk looks like on disk.
167 * Caller has zero'd the entire dquot 'chunk' already.
169 d->dd_diskdq.d_magic = cpu_to_be16(XFS_DQUOT_MAGIC);
170 d->dd_diskdq.d_version = XFS_DQUOT_VERSION;
171 d->dd_diskdq.d_id = cpu_to_be32(id);
172 d->dd_diskdq.d_flags = type;
176 * If default limits are in force, push them into the dquot now.
177 * We overwrite the dquot limits only if they are zero and this
178 * is not the root dquot.
181 xfs_qm_adjust_dqlimits(
185 xfs_quotainfo_t *q = mp->m_quotainfo;
189 if (q->qi_bsoftlimit && !d->d_blk_softlimit)
190 d->d_blk_softlimit = cpu_to_be64(q->qi_bsoftlimit);
191 if (q->qi_bhardlimit && !d->d_blk_hardlimit)
192 d->d_blk_hardlimit = cpu_to_be64(q->qi_bhardlimit);
193 if (q->qi_isoftlimit && !d->d_ino_softlimit)
194 d->d_ino_softlimit = cpu_to_be64(q->qi_isoftlimit);
195 if (q->qi_ihardlimit && !d->d_ino_hardlimit)
196 d->d_ino_hardlimit = cpu_to_be64(q->qi_ihardlimit);
197 if (q->qi_rtbsoftlimit && !d->d_rtb_softlimit)
198 d->d_rtb_softlimit = cpu_to_be64(q->qi_rtbsoftlimit);
199 if (q->qi_rtbhardlimit && !d->d_rtb_hardlimit)
200 d->d_rtb_hardlimit = cpu_to_be64(q->qi_rtbhardlimit);
204 * Check the limits and timers of a dquot and start or reset timers
206 * This gets called even when quota enforcement is OFF, which makes our
207 * life a little less complicated. (We just don't reject any quota
208 * reservations in that case, when enforcement is off).
209 * We also return 0 as the values of the timers in Q_GETQUOTA calls, when
211 * In contrast, warnings are a little different in that they don't
212 * 'automatically' get started when limits get exceeded. They do
213 * get reset to zero, however, when we find the count to be under
214 * the soft limit (they are only ever set non-zero via userspace).
217 xfs_qm_adjust_dqtimers(
224 if (d->d_blk_hardlimit)
225 ASSERT(be64_to_cpu(d->d_blk_softlimit) <=
226 be64_to_cpu(d->d_blk_hardlimit));
227 if (d->d_ino_hardlimit)
228 ASSERT(be64_to_cpu(d->d_ino_softlimit) <=
229 be64_to_cpu(d->d_ino_hardlimit));
230 if (d->d_rtb_hardlimit)
231 ASSERT(be64_to_cpu(d->d_rtb_softlimit) <=
232 be64_to_cpu(d->d_rtb_hardlimit));
236 if ((d->d_blk_softlimit &&
237 (be64_to_cpu(d->d_bcount) >=
238 be64_to_cpu(d->d_blk_softlimit))) ||
239 (d->d_blk_hardlimit &&
240 (be64_to_cpu(d->d_bcount) >=
241 be64_to_cpu(d->d_blk_hardlimit)))) {
242 d->d_btimer = cpu_to_be32(get_seconds() +
243 mp->m_quotainfo->qi_btimelimit);
248 if ((!d->d_blk_softlimit ||
249 (be64_to_cpu(d->d_bcount) <
250 be64_to_cpu(d->d_blk_softlimit))) &&
251 (!d->d_blk_hardlimit ||
252 (be64_to_cpu(d->d_bcount) <
253 be64_to_cpu(d->d_blk_hardlimit)))) {
259 if ((d->d_ino_softlimit &&
260 (be64_to_cpu(d->d_icount) >=
261 be64_to_cpu(d->d_ino_softlimit))) ||
262 (d->d_ino_hardlimit &&
263 (be64_to_cpu(d->d_icount) >=
264 be64_to_cpu(d->d_ino_hardlimit)))) {
265 d->d_itimer = cpu_to_be32(get_seconds() +
266 mp->m_quotainfo->qi_itimelimit);
271 if ((!d->d_ino_softlimit ||
272 (be64_to_cpu(d->d_icount) <
273 be64_to_cpu(d->d_ino_softlimit))) &&
274 (!d->d_ino_hardlimit ||
275 (be64_to_cpu(d->d_icount) <
276 be64_to_cpu(d->d_ino_hardlimit)))) {
281 if (!d->d_rtbtimer) {
282 if ((d->d_rtb_softlimit &&
283 (be64_to_cpu(d->d_rtbcount) >=
284 be64_to_cpu(d->d_rtb_softlimit))) ||
285 (d->d_rtb_hardlimit &&
286 (be64_to_cpu(d->d_rtbcount) >=
287 be64_to_cpu(d->d_rtb_hardlimit)))) {
288 d->d_rtbtimer = cpu_to_be32(get_seconds() +
289 mp->m_quotainfo->qi_rtbtimelimit);
294 if ((!d->d_rtb_softlimit ||
295 (be64_to_cpu(d->d_rtbcount) <
296 be64_to_cpu(d->d_rtb_softlimit))) &&
297 (!d->d_rtb_hardlimit ||
298 (be64_to_cpu(d->d_rtbcount) <
299 be64_to_cpu(d->d_rtb_hardlimit)))) {
306 * initialize a buffer full of dquots and log the whole thing
309 xfs_qm_init_dquot_blk(
316 struct xfs_quotainfo *q = mp->m_quotainfo;
321 ASSERT(xfs_buf_islocked(bp));
326 * ID of the first dquot in the block - id's are zero based.
328 curid = id - (id % q->qi_dqperchunk);
330 memset(d, 0, BBTOB(q->qi_dqchunklen));
331 for (i = 0; i < q->qi_dqperchunk; i++, d++, curid++)
332 xfs_qm_dqinit_core(curid, type, d);
333 xfs_trans_dquot_buf(tp, bp,
334 (type & XFS_DQ_USER ? XFS_BLF_UDQUOT_BUF :
335 ((type & XFS_DQ_PROJ) ? XFS_BLF_PDQUOT_BUF :
336 XFS_BLF_GDQUOT_BUF)));
337 xfs_trans_log_buf(tp, bp, 0, BBTOB(q->qi_dqchunklen) - 1);
343 * Allocate a block and fill it with dquots.
344 * This is called when the bmapi finds a hole.
352 xfs_fileoff_t offset_fsb,
355 xfs_fsblock_t firstblock;
356 xfs_bmap_free_t flist;
358 int nmaps, error, committed;
360 xfs_trans_t *tp = *tpp;
364 trace_xfs_dqalloc(dqp);
367 * Initialize the bmap freelist prior to calling bmapi code.
369 xfs_bmap_init(&flist, &firstblock);
370 xfs_ilock(quotip, XFS_ILOCK_EXCL);
372 * Return if this type of quotas is turned off while we didn't
375 if (XFS_IS_THIS_QUOTA_OFF(dqp)) {
376 xfs_iunlock(quotip, XFS_ILOCK_EXCL);
380 xfs_trans_ijoin_ref(tp, quotip, XFS_ILOCK_EXCL);
382 if ((error = xfs_bmapi(tp, quotip,
383 offset_fsb, XFS_DQUOT_CLUSTER_SIZE_FSB,
384 XFS_BMAPI_METADATA | XFS_BMAPI_WRITE,
386 XFS_QM_DQALLOC_SPACE_RES(mp),
387 &map, &nmaps, &flist))) {
390 ASSERT(map.br_blockcount == XFS_DQUOT_CLUSTER_SIZE_FSB);
392 ASSERT((map.br_startblock != DELAYSTARTBLOCK) &&
393 (map.br_startblock != HOLESTARTBLOCK));
396 * Keep track of the blkno to save a lookup later
398 dqp->q_blkno = XFS_FSB_TO_DADDR(mp, map.br_startblock);
400 /* now we can just get the buffer (there's nothing to read yet) */
401 bp = xfs_trans_get_buf(tp, mp->m_ddev_targp,
403 mp->m_quotainfo->qi_dqchunklen,
405 if (!bp || (error = xfs_buf_geterror(bp)))
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 * Maps a dquot to the buffer containing its on-disk version.
453 * This returns a ptr to the buffer containing the on-disk dquot
454 * in the bpp param, and a ptr to the on-disk dquot within that buffer
460 xfs_disk_dquot_t **O_ddpp,
465 int nmaps = 1, error;
467 xfs_inode_t *quotip = XFS_DQ_TO_QIP(dqp);
468 xfs_mount_t *mp = dqp->q_mount;
469 xfs_disk_dquot_t *ddq;
470 xfs_dqid_t id = be32_to_cpu(dqp->q_core.d_id);
471 xfs_trans_t *tp = (tpp ? *tpp : NULL);
473 dqp->q_fileoffset = (xfs_fileoff_t)id / mp->m_quotainfo->qi_dqperchunk;
475 xfs_ilock(quotip, XFS_ILOCK_SHARED);
476 if (XFS_IS_THIS_QUOTA_OFF(dqp)) {
478 * Return if this type of quotas is turned off while we
479 * didn't have the quota inode lock.
481 xfs_iunlock(quotip, XFS_ILOCK_SHARED);
486 * Find the block map; no allocations yet
488 error = xfs_bmapi(NULL, quotip, dqp->q_fileoffset,
489 XFS_DQUOT_CLUSTER_SIZE_FSB, XFS_BMAPI_METADATA,
490 NULL, 0, &map, &nmaps, NULL);
492 xfs_iunlock(quotip, XFS_ILOCK_SHARED);
497 ASSERT(map.br_blockcount == 1);
500 * Offset of dquot in the (fixed sized) dquot chunk.
502 dqp->q_bufoffset = (id % mp->m_quotainfo->qi_dqperchunk) *
505 ASSERT(map.br_startblock != DELAYSTARTBLOCK);
506 if (map.br_startblock == HOLESTARTBLOCK) {
508 * We don't allocate unless we're asked to
510 if (!(flags & XFS_QMOPT_DQALLOC))
514 error = xfs_qm_dqalloc(tpp, mp, dqp, quotip,
515 dqp->q_fileoffset, &bp);
520 trace_xfs_dqtobp_read(dqp);
523 * store the blkno etc so that we don't have to do the
524 * mapping all the time
526 dqp->q_blkno = XFS_FSB_TO_DADDR(mp, map.br_startblock);
528 error = xfs_trans_read_buf(mp, tp, mp->m_ddev_targp,
530 mp->m_quotainfo->qi_dqchunklen,
533 return XFS_ERROR(error);
536 ASSERT(xfs_buf_islocked(bp));
539 * calculate the location of the dquot inside the buffer.
541 ddq = bp->b_addr + dqp->q_bufoffset;
544 * A simple sanity check in case we got a corrupted dquot...
546 error = xfs_qm_dqcheck(mp, ddq, id, dqp->dq_flags & XFS_DQ_ALLTYPES,
547 flags & (XFS_QMOPT_DQREPAIR|XFS_QMOPT_DOWARN),
550 if (!(flags & XFS_QMOPT_DQREPAIR)) {
551 xfs_trans_brelse(tp, bp);
552 return XFS_ERROR(EIO);
564 * Read in the ondisk dquot using dqtobp() then copy it to an incore version,
565 * and release the buffer immediately.
573 xfs_dquot_t *dqp, /* dquot to get filled in */
576 xfs_disk_dquot_t *ddqp;
583 trace_xfs_dqread(dqp);
586 * get a pointer to the on-disk dquot and the buffer containing it
587 * dqp already knows its own type (GROUP/USER).
589 if ((error = xfs_qm_dqtobp(tpp, dqp, &ddqp, &bp, flags))) {
594 /* copy everything from disk dquot to the incore dquot */
595 memcpy(&dqp->q_core, ddqp, sizeof(xfs_disk_dquot_t));
596 ASSERT(be32_to_cpu(dqp->q_core.d_id) == id);
597 xfs_qm_dquot_logitem_init(dqp);
600 * Reservation counters are defined as reservation plus current usage
601 * to avoid having to add every time.
603 dqp->q_res_bcount = be64_to_cpu(ddqp->d_bcount);
604 dqp->q_res_icount = be64_to_cpu(ddqp->d_icount);
605 dqp->q_res_rtbcount = be64_to_cpu(ddqp->d_rtbcount);
607 /* Mark the buf so that this will stay incore a little longer */
608 XFS_BUF_SET_VTYPE_REF(bp, B_FS_DQUOT, XFS_DQUOT_REF);
611 * We got the buffer with a xfs_trans_read_buf() (in dqtobp())
612 * So we need to release with xfs_trans_brelse().
613 * The strategy here is identical to that of inodes; we lock
614 * the dquot in xfs_qm_dqget() before making it accessible to
615 * others. This is because dquots, like inodes, need a good level of
616 * concurrency, and we don't want to take locks on the entire buffers
617 * for dquot accesses.
618 * Note also that the dquot buffer may even be dirty at this point, if
619 * this particular dquot was repaired. We still aren't afraid to
620 * brelse it because we have the changes incore.
622 ASSERT(xfs_buf_islocked(bp));
623 xfs_trans_brelse(tp, bp);
630 * allocate an incore dquot from the kernel heap,
631 * and fill its core with quota information kept on disk.
632 * If XFS_QMOPT_DQALLOC is set, it'll allocate a dquot on disk
633 * if it wasn't already allocated.
638 xfs_dqid_t id, /* gid or uid, depending on type */
639 uint type, /* UDQUOT or GDQUOT */
640 uint flags, /* DQALLOC, DQREPAIR */
641 xfs_dquot_t **O_dqpp)/* OUT : incore dquot, not locked */
648 dqp = xfs_qm_dqinit(mp, id, type);
650 if (flags & XFS_QMOPT_DQALLOC) {
651 tp = xfs_trans_alloc(mp, XFS_TRANS_QM_DQALLOC);
652 error = xfs_trans_reserve(tp, XFS_QM_DQALLOC_SPACE_RES(mp),
653 XFS_WRITE_LOG_RES(mp) +
654 BBTOB(mp->m_quotainfo->qi_dqchunklen) - 1 +
657 XFS_TRANS_PERM_LOG_RES,
658 XFS_WRITE_LOG_COUNT);
663 cancelflags = XFS_TRANS_RELEASE_LOG_RES;
667 * Read it from disk; xfs_dqread() takes care of
668 * all the necessary initialization of dquot's fields (locks, etc)
670 if ((error = xfs_qm_dqread(&tp, id, dqp, flags))) {
672 * This can happen if quotas got turned off (ESRCH),
673 * or if the dquot didn't exist on disk and we ask to
676 trace_xfs_dqread_fail(dqp);
677 cancelflags |= XFS_TRANS_ABORT;
681 if ((error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES)))
691 xfs_trans_cancel(tp, cancelflags);
693 xfs_qm_dqdestroy(dqp);
699 * Lookup a dquot in the incore dquot hashtable. We keep two separate
700 * hashtables for user and group dquots; and, these are global tables
701 * inside the XQM, not per-filesystem tables.
702 * The hash chain must be locked by caller, and it is left locked
703 * on return. Returning dquot is locked.
710 xfs_dquot_t **O_dqpp)
715 ASSERT(mutex_is_locked(&qh->qh_lock));
717 flist_locked = B_FALSE;
720 * Traverse the hashchain looking for a match
722 list_for_each_entry(dqp, &qh->qh_list, q_hashlist) {
724 * We already have the hashlock. We don't need the
725 * dqlock to look at the id field of the dquot, since the
726 * id can't be modified without the hashlock anyway.
728 if (be32_to_cpu(dqp->q_core.d_id) == id && dqp->q_mount == mp) {
729 trace_xfs_dqlookup_found(dqp);
732 * All in core dquots must be on the dqlist of mp
734 ASSERT(!list_empty(&dqp->q_mplist));
737 if (dqp->q_nrefs == 0) {
738 ASSERT(!list_empty(&dqp->q_freelist));
739 if (!mutex_trylock(&xfs_Gqm->qm_dqfrlist_lock)) {
740 trace_xfs_dqlookup_want(dqp);
743 * We may have raced with dqreclaim_one()
744 * (and lost). So, flag that we don't
745 * want the dquot to be reclaimed.
747 dqp->dq_flags |= XFS_DQ_WANT;
749 mutex_lock(&xfs_Gqm->qm_dqfrlist_lock);
751 dqp->dq_flags &= ~(XFS_DQ_WANT);
753 flist_locked = B_TRUE;
757 * id couldn't have changed; we had the hashlock all
760 ASSERT(be32_to_cpu(dqp->q_core.d_id) == id);
763 if (dqp->q_nrefs != 0) {
764 mutex_unlock(&xfs_Gqm->qm_dqfrlist_lock);
765 flist_locked = B_FALSE;
767 /* take it off the freelist */
768 trace_xfs_dqlookup_freelist(dqp);
769 list_del_init(&dqp->q_freelist);
770 xfs_Gqm->qm_dqfrlist_cnt--;
777 mutex_unlock(&xfs_Gqm->qm_dqfrlist_lock);
779 * move the dquot to the front of the hashchain
781 ASSERT(mutex_is_locked(&qh->qh_lock));
782 list_move(&dqp->q_hashlist, &qh->qh_list);
783 trace_xfs_dqlookup_done(dqp);
790 ASSERT(mutex_is_locked(&qh->qh_lock));
795 * Given the file system, inode OR id, and type (UDQUOT/GDQUOT), return a
796 * a locked dquot, doing an allocation (if requested) as needed.
797 * When both an inode and an id are given, the inode's id takes precedence.
798 * That is, if the id changes while we don't hold the ilock inside this
799 * function, the new dquot is returned, not necessarily the one requested
800 * in the id argument.
805 xfs_inode_t *ip, /* locked inode (optional) */
806 xfs_dqid_t id, /* uid/projid/gid depending on type */
807 uint type, /* XFS_DQ_USER/XFS_DQ_PROJ/XFS_DQ_GROUP */
808 uint flags, /* DQALLOC, DQSUSER, DQREPAIR, DOWARN */
809 xfs_dquot_t **O_dqpp) /* OUT : locked incore dquot */
816 ASSERT(XFS_IS_QUOTA_RUNNING(mp));
817 if ((! XFS_IS_UQUOTA_ON(mp) && type == XFS_DQ_USER) ||
818 (! XFS_IS_PQUOTA_ON(mp) && type == XFS_DQ_PROJ) ||
819 (! XFS_IS_GQUOTA_ON(mp) && type == XFS_DQ_GROUP)) {
822 h = XFS_DQ_HASH(mp, id, type);
825 if (xfs_do_dqerror) {
826 if ((xfs_dqerror_target == mp->m_ddev_targp) &&
827 (xfs_dqreq_num++ % xfs_dqerror_mod) == 0) {
828 xfs_debug(mp, "Returning error in dqget");
837 ASSERT(type == XFS_DQ_USER ||
838 type == XFS_DQ_PROJ ||
839 type == XFS_DQ_GROUP);
841 ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
842 if (type == XFS_DQ_USER)
843 ASSERT(ip->i_udquot == NULL);
845 ASSERT(ip->i_gdquot == NULL);
848 mutex_lock(&h->qh_lock);
851 * Look in the cache (hashtable).
852 * The chain is kept locked during lookup.
854 if (xfs_qm_dqlookup(mp, id, h, O_dqpp) == 0) {
855 XQM_STATS_INC(xqmstats.xs_qm_dqcachehits);
857 * The dquot was found, moved to the front of the chain,
858 * taken off the freelist if it was on it, and locked
859 * at this point. Just unlock the hashchain and return.
862 ASSERT(XFS_DQ_IS_LOCKED(*O_dqpp));
863 mutex_unlock(&h->qh_lock);
864 trace_xfs_dqget_hit(*O_dqpp);
865 return (0); /* success */
867 XQM_STATS_INC(xqmstats.xs_qm_dqcachemisses);
870 * Dquot cache miss. We don't want to keep the inode lock across
871 * a (potential) disk read. Also we don't want to deal with the lock
872 * ordering between quotainode and this inode. OTOH, dropping the inode
873 * lock here means dealing with a chown that can happen before
874 * we re-acquire the lock.
877 xfs_iunlock(ip, XFS_ILOCK_EXCL);
879 * Save the hashchain version stamp, and unlock the chain, so that
880 * we don't keep the lock across a disk read
882 version = h->qh_version;
883 mutex_unlock(&h->qh_lock);
886 * Allocate the dquot on the kernel heap, and read the ondisk
887 * portion off the disk. Also, do all the necessary initialization
888 * This can return ENOENT if dquot didn't exist on disk and we didn't
889 * ask it to allocate; ESRCH if quotas got turned off suddenly.
891 if ((error = xfs_qm_idtodq(mp, id, type,
892 flags & (XFS_QMOPT_DQALLOC|XFS_QMOPT_DQREPAIR|
896 xfs_ilock(ip, XFS_ILOCK_EXCL);
901 * See if this is mount code calling to look at the overall quota limits
902 * which are stored in the id == 0 user or group's dquot.
903 * Since we may not have done a quotacheck by this point, just return
904 * the dquot without attaching it to any hashtables, lists, etc, or even
905 * taking a reference.
906 * The caller must dqdestroy this once done.
908 if (flags & XFS_QMOPT_DQSUSER) {
915 * Dquot lock comes after hashlock in the lock ordering
918 xfs_ilock(ip, XFS_ILOCK_EXCL);
921 * A dquot could be attached to this inode by now, since
922 * we had dropped the ilock.
924 if (type == XFS_DQ_USER) {
925 if (!XFS_IS_UQUOTA_ON(mp)) {
926 /* inode stays locked on return */
927 xfs_qm_dqdestroy(dqp);
928 return XFS_ERROR(ESRCH);
931 xfs_qm_dqdestroy(dqp);
937 if (!XFS_IS_OQUOTA_ON(mp)) {
938 /* inode stays locked on return */
939 xfs_qm_dqdestroy(dqp);
940 return XFS_ERROR(ESRCH);
943 xfs_qm_dqdestroy(dqp);
952 * Hashlock comes after ilock in lock order
954 mutex_lock(&h->qh_lock);
955 if (version != h->qh_version) {
958 * Now, see if somebody else put the dquot in the
959 * hashtable before us. This can happen because we didn't
960 * keep the hashchain lock. We don't have to worry about
961 * lock order between the two dquots here since dqp isn't
962 * on any findable lists yet.
964 if (xfs_qm_dqlookup(mp, id, h, &tmpdqp) == 0) {
966 * Duplicate found. Just throw away the new dquot
969 xfs_qm_dqput(tmpdqp);
970 mutex_unlock(&h->qh_lock);
971 xfs_qm_dqdestroy(dqp);
972 XQM_STATS_INC(xqmstats.xs_qm_dquot_dups);
978 * Put the dquot at the beginning of the hash-chain and mp's list
979 * LOCK ORDER: hashlock, freelistlock, mplistlock, udqlock, gdqlock ..
981 ASSERT(mutex_is_locked(&h->qh_lock));
983 list_add(&dqp->q_hashlist, &h->qh_list);
987 * Attach this dquot to this filesystem's list of all dquots,
988 * kept inside the mount structure in m_quotainfo field
990 mutex_lock(&mp->m_quotainfo->qi_dqlist_lock);
993 * We return a locked dquot to the caller, with a reference taken
998 list_add(&dqp->q_mplist, &mp->m_quotainfo->qi_dqlist);
999 mp->m_quotainfo->qi_dquots++;
1000 mutex_unlock(&mp->m_quotainfo->qi_dqlist_lock);
1001 mutex_unlock(&h->qh_lock);
1003 ASSERT((ip == NULL) || xfs_isilocked(ip, XFS_ILOCK_EXCL));
1004 trace_xfs_dqget_miss(dqp);
1011 * Release a reference to the dquot (decrement ref-count)
1012 * and unlock it. If there is a group quota attached to this
1013 * dquot, carefully release that too without tripping over
1014 * deadlocks'n'stuff.
1022 ASSERT(dqp->q_nrefs > 0);
1023 ASSERT(XFS_DQ_IS_LOCKED(dqp));
1025 trace_xfs_dqput(dqp);
1027 if (dqp->q_nrefs != 1) {
1034 * drop the dqlock and acquire the freelist and dqlock
1035 * in the right order; but try to get it out-of-order first
1037 if (!mutex_trylock(&xfs_Gqm->qm_dqfrlist_lock)) {
1038 trace_xfs_dqput_wait(dqp);
1040 mutex_lock(&xfs_Gqm->qm_dqfrlist_lock);
1047 /* We can't depend on nrefs being == 1 here */
1048 if (--dqp->q_nrefs == 0) {
1049 trace_xfs_dqput_free(dqp);
1051 list_add_tail(&dqp->q_freelist, &xfs_Gqm->qm_dqfrlist);
1052 xfs_Gqm->qm_dqfrlist_cnt++;
1055 * If we just added a udquot to the freelist, then
1056 * we want to release the gdquot reference that
1057 * it (probably) has. Otherwise it'll keep the
1058 * gdquot from getting reclaimed.
1060 if ((gdqp = dqp->q_gdquot)) {
1062 * Avoid a recursive dqput call
1065 dqp->q_gdquot = NULL;
1071 * If we had a group quota inside the user quota as a hint,
1078 mutex_unlock(&xfs_Gqm->qm_dqfrlist_lock);
1082 * Release a dquot. Flush it if dirty, then dqput() it.
1083 * dquot must not be locked.
1092 trace_xfs_dqrele(dqp);
1096 * We don't care to flush it if the dquot is dirty here.
1097 * That will create stutters that we want to avoid.
1098 * Instead we do a delayed write when we try to reclaim
1099 * a dirty dquot. Also xfs_sync will take part of the burden...
1105 * This is the dquot flushing I/O completion routine. It is called
1106 * from interrupt level when the buffer containing the dquot is
1107 * flushed to disk. It is responsible for removing the dquot logitem
1108 * from the AIL if it has not been re-logged, and unlocking the dquot's
1109 * flush lock. This behavior is very similar to that of inodes..
1112 xfs_qm_dqflush_done(
1114 struct xfs_log_item *lip)
1116 xfs_dq_logitem_t *qip = (struct xfs_dq_logitem *)lip;
1117 xfs_dquot_t *dqp = qip->qli_dquot;
1118 struct xfs_ail *ailp = lip->li_ailp;
1121 * We only want to pull the item from the AIL if its
1122 * location in the log has not changed since we started the flush.
1123 * Thus, we only bother if the dquot's lsn has
1124 * not changed. First we check the lsn outside the lock
1125 * since it's cheaper, and then we recheck while
1126 * holding the lock before removing the dquot from the AIL.
1128 if ((lip->li_flags & XFS_LI_IN_AIL) &&
1129 lip->li_lsn == qip->qli_flush_lsn) {
1131 /* xfs_trans_ail_delete() drops the AIL lock. */
1132 spin_lock(&ailp->xa_lock);
1133 if (lip->li_lsn == qip->qli_flush_lsn)
1134 xfs_trans_ail_delete(ailp, lip);
1136 spin_unlock(&ailp->xa_lock);
1140 * Release the dq's flush lock since we're done with it.
1146 * Write a modified dquot to disk.
1147 * The dquot must be locked and the flush lock too taken by caller.
1148 * The flush lock will not be unlocked until the dquot reaches the disk,
1149 * but the dquot is free to be unlocked and modified by the caller
1150 * in the interim. Dquot is still locked on return. This behavior is
1151 * identical to that of inodes.
1158 struct xfs_mount *mp = dqp->q_mount;
1160 struct xfs_disk_dquot *ddqp;
1163 ASSERT(XFS_DQ_IS_LOCKED(dqp));
1164 ASSERT(!completion_done(&dqp->q_flush));
1166 trace_xfs_dqflush(dqp);
1169 * If not dirty, or it's pinned and we are not supposed to block, nada.
1171 if (!XFS_DQ_IS_DIRTY(dqp) ||
1172 (!(flags & SYNC_WAIT) && atomic_read(&dqp->q_pincount) > 0)) {
1176 xfs_qm_dqunpin_wait(dqp);
1179 * This may have been unpinned because the filesystem is shutting
1180 * down forcibly. If that's the case we must not write this dquot
1181 * to disk, because the log record didn't make it to disk!
1183 if (XFS_FORCED_SHUTDOWN(mp)) {
1184 dqp->dq_flags &= ~XFS_DQ_DIRTY;
1186 return XFS_ERROR(EIO);
1190 * Get the buffer containing the on-disk dquot
1192 error = xfs_trans_read_buf(mp, NULL, mp->m_ddev_targp, dqp->q_blkno,
1193 mp->m_quotainfo->qi_dqchunklen, 0, &bp);
1195 ASSERT(error != ENOENT);
1201 * Calculate the location of the dquot inside the buffer.
1203 ddqp = bp->b_addr + dqp->q_bufoffset;
1206 * A simple sanity check in case we got a corrupted dquot..
1208 error = xfs_qm_dqcheck(mp, &dqp->q_core, be32_to_cpu(ddqp->d_id), 0,
1209 XFS_QMOPT_DOWARN, "dqflush (incore copy)");
1213 xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE);
1214 return XFS_ERROR(EIO);
1217 /* This is the only portion of data that needs to persist */
1218 memcpy(ddqp, &dqp->q_core, sizeof(xfs_disk_dquot_t));
1221 * Clear the dirty field and remember the flush lsn for later use.
1223 dqp->dq_flags &= ~XFS_DQ_DIRTY;
1225 xfs_trans_ail_copy_lsn(mp->m_ail, &dqp->q_logitem.qli_flush_lsn,
1226 &dqp->q_logitem.qli_item.li_lsn);
1229 * Attach an iodone routine so that we can remove this dquot from the
1230 * AIL and release the flush lock once the dquot is synced to disk.
1232 xfs_buf_attach_iodone(bp, xfs_qm_dqflush_done,
1233 &dqp->q_logitem.qli_item);
1236 * If the buffer is pinned then push on the log so we won't
1237 * get stuck waiting in the write for too long.
1239 if (xfs_buf_ispinned(bp)) {
1240 trace_xfs_dqflush_force(dqp);
1241 xfs_log_force(mp, 0);
1244 if (flags & SYNC_WAIT)
1245 error = xfs_bwrite(mp, bp);
1247 xfs_bdwrite(mp, bp);
1249 trace_xfs_dqflush_done(dqp);
1252 * dqp is still locked, but caller is free to unlock it now.
1259 xfs_qm_dqlock_nowait(
1262 return mutex_trylock(&dqp->q_qlock);
1269 mutex_lock(&dqp->q_qlock);
1276 mutex_unlock(&(dqp->q_qlock));
1277 if (dqp->q_logitem.qli_dquot == dqp) {
1278 /* Once was dqp->q_mount, but might just have been cleared */
1279 xfs_trans_unlocked_item(dqp->q_logitem.qli_item.li_ailp,
1280 (xfs_log_item_t*)&(dqp->q_logitem));
1286 xfs_dqunlock_nonotify(
1289 mutex_unlock(&(dqp->q_qlock));
1293 * Lock two xfs_dquot structures.
1295 * To avoid deadlocks we always lock the quota structure with
1296 * the lowerd id first.
1305 if (be32_to_cpu(d1->q_core.d_id) >
1306 be32_to_cpu(d2->q_core.d_id)) {
1307 mutex_lock(&d2->q_qlock);
1308 mutex_lock_nested(&d1->q_qlock, XFS_QLOCK_NESTED);
1310 mutex_lock(&d1->q_qlock);
1311 mutex_lock_nested(&d2->q_qlock, XFS_QLOCK_NESTED);
1314 mutex_lock(&d1->q_qlock);
1316 mutex_lock(&d2->q_qlock);
1322 * Take a dquot out of the mount's dqlist as well as the hashlist.
1323 * This is called via unmount as well as quotaoff, and the purge
1324 * will always succeed unless there are soft (temp) references
1327 * This returns 0 if it was purged, 1 if it wasn't. It's not an error code
1328 * that we're returning! XXXsup - not cool.
1335 xfs_dqhash_t *qh = dqp->q_hash;
1336 xfs_mount_t *mp = dqp->q_mount;
1338 ASSERT(mutex_is_locked(&mp->m_quotainfo->qi_dqlist_lock));
1339 ASSERT(mutex_is_locked(&dqp->q_hash->qh_lock));
1343 * We really can't afford to purge a dquot that is
1344 * referenced, because these are hard refs.
1345 * It shouldn't happen in general because we went thru _all_ inodes in
1346 * dqrele_all_inodes before calling this and didn't let the mountlock go.
1347 * However it is possible that we have dquots with temporary
1348 * references that are not attached to an inode. e.g. see xfs_setattr().
1350 if (dqp->q_nrefs != 0) {
1352 mutex_unlock(&dqp->q_hash->qh_lock);
1356 ASSERT(!list_empty(&dqp->q_freelist));
1359 * If we're turning off quotas, we have to make sure that, for
1360 * example, we don't delete quota disk blocks while dquots are
1361 * in the process of getting written to those disk blocks.
1362 * This dquot might well be on AIL, and we can't leave it there
1363 * if we're turning off quotas. Basically, we need this flush
1364 * lock, and are willing to block on it.
1366 if (!xfs_dqflock_nowait(dqp)) {
1368 * Block on the flush lock after nudging dquot buffer,
1371 xfs_qm_dqflock_pushbuf_wait(dqp);
1375 * XXXIf we're turning this type of quotas off, we don't care
1376 * about the dirty metadata sitting in this dquot. OTOH, if
1377 * we're unmounting, we do care, so we flush it and wait.
1379 if (XFS_DQ_IS_DIRTY(dqp)) {
1382 /* dqflush unlocks dqflock */
1384 * Given that dqpurge is a very rare occurrence, it is OK
1385 * that we're holding the hashlist and mplist locks
1386 * across the disk write. But, ... XXXsup
1388 * We don't care about getting disk errors here. We need
1389 * to purge this dquot anyway, so we go ahead regardless.
1391 error = xfs_qm_dqflush(dqp, SYNC_WAIT);
1393 xfs_warn(mp, "%s: dquot %p flush failed",
1397 ASSERT(atomic_read(&dqp->q_pincount) == 0);
1398 ASSERT(XFS_FORCED_SHUTDOWN(mp) ||
1399 !(dqp->q_logitem.qli_item.li_flags & XFS_LI_IN_AIL));
1401 list_del_init(&dqp->q_hashlist);
1403 list_del_init(&dqp->q_mplist);
1404 mp->m_quotainfo->qi_dqreclaims++;
1405 mp->m_quotainfo->qi_dquots--;
1407 * XXX Move this to the front of the freelist, if we can get the
1410 ASSERT(!list_empty(&dqp->q_freelist));
1412 dqp->q_mount = NULL;
1414 dqp->dq_flags = XFS_DQ_INACTIVE;
1415 memset(&dqp->q_core, 0, sizeof(dqp->q_core));
1418 mutex_unlock(&qh->qh_lock);
1424 * Give the buffer a little push if it is incore and
1425 * wait on the flush lock.
1428 xfs_qm_dqflock_pushbuf_wait(
1431 xfs_mount_t *mp = dqp->q_mount;
1435 * Check to see if the dquot has been flushed delayed
1436 * write. If so, grab its buffer and send it
1437 * out immediately. We'll be able to acquire
1438 * the flush lock when the I/O completes.
1440 bp = xfs_incore(mp->m_ddev_targp, dqp->q_blkno,
1441 mp->m_quotainfo->qi_dqchunklen, XBF_TRYLOCK);
1445 if (XFS_BUF_ISDELAYWRITE(bp)) {
1446 if (xfs_buf_ispinned(bp))
1447 xfs_log_force(mp, 0);
1448 xfs_buf_delwri_promote(bp);
1449 wake_up_process(bp->b_target->bt_task);