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 sv_destroy(&dqp->q_pinwait);
153 kmem_zone_free(xfs_Gqm->qm_dqzone, dqp);
155 atomic_dec(&xfs_Gqm->qm_totaldquots);
159 * This is what a 'fresh' dquot inside a dquot chunk looks like on disk.
168 * Caller has zero'd the entire dquot 'chunk' already.
170 d->dd_diskdq.d_magic = cpu_to_be16(XFS_DQUOT_MAGIC);
171 d->dd_diskdq.d_version = XFS_DQUOT_VERSION;
172 d->dd_diskdq.d_id = cpu_to_be32(id);
173 d->dd_diskdq.d_flags = type;
177 * If default limits are in force, push them into the dquot now.
178 * We overwrite the dquot limits only if they are zero and this
179 * is not the root dquot.
182 xfs_qm_adjust_dqlimits(
186 xfs_quotainfo_t *q = mp->m_quotainfo;
190 if (q->qi_bsoftlimit && !d->d_blk_softlimit)
191 d->d_blk_softlimit = cpu_to_be64(q->qi_bsoftlimit);
192 if (q->qi_bhardlimit && !d->d_blk_hardlimit)
193 d->d_blk_hardlimit = cpu_to_be64(q->qi_bhardlimit);
194 if (q->qi_isoftlimit && !d->d_ino_softlimit)
195 d->d_ino_softlimit = cpu_to_be64(q->qi_isoftlimit);
196 if (q->qi_ihardlimit && !d->d_ino_hardlimit)
197 d->d_ino_hardlimit = cpu_to_be64(q->qi_ihardlimit);
198 if (q->qi_rtbsoftlimit && !d->d_rtb_softlimit)
199 d->d_rtb_softlimit = cpu_to_be64(q->qi_rtbsoftlimit);
200 if (q->qi_rtbhardlimit && !d->d_rtb_hardlimit)
201 d->d_rtb_hardlimit = cpu_to_be64(q->qi_rtbhardlimit);
205 * Check the limits and timers of a dquot and start or reset timers
207 * This gets called even when quota enforcement is OFF, which makes our
208 * life a little less complicated. (We just don't reject any quota
209 * reservations in that case, when enforcement is off).
210 * We also return 0 as the values of the timers in Q_GETQUOTA calls, when
212 * In contrast, warnings are a little different in that they don't
213 * 'automatically' get started when limits get exceeded. They do
214 * get reset to zero, however, when we find the count to be under
215 * the soft limit (they are only ever set non-zero via userspace).
218 xfs_qm_adjust_dqtimers(
225 if (d->d_blk_hardlimit)
226 ASSERT(be64_to_cpu(d->d_blk_softlimit) <=
227 be64_to_cpu(d->d_blk_hardlimit));
228 if (d->d_ino_hardlimit)
229 ASSERT(be64_to_cpu(d->d_ino_softlimit) <=
230 be64_to_cpu(d->d_ino_hardlimit));
231 if (d->d_rtb_hardlimit)
232 ASSERT(be64_to_cpu(d->d_rtb_softlimit) <=
233 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_ISBUSY(bp));
322 ASSERT(XFS_BUF_VALUSEMA(bp) <= 0);
324 d = (xfs_dqblk_t *)XFS_BUF_PTR(bp);
327 * ID of the first dquot in the block - id's are zero based.
329 curid = id - (id % q->qi_dqperchunk);
331 memset(d, 0, BBTOB(q->qi_dqchunklen));
332 for (i = 0; i < q->qi_dqperchunk; i++, d++, curid++)
333 xfs_qm_dqinit_core(curid, type, d);
334 xfs_trans_dquot_buf(tp, bp,
335 (type & XFS_DQ_USER ? XFS_BLF_UDQUOT_BUF :
336 ((type & XFS_DQ_PROJ) ? XFS_BLF_PDQUOT_BUF :
337 XFS_BLF_GDQUOT_BUF)));
338 xfs_trans_log_buf(tp, bp, 0, BBTOB(q->qi_dqchunklen) - 1);
344 * Allocate a block and fill it with dquots.
345 * This is called when the bmapi finds a hole.
353 xfs_fileoff_t offset_fsb,
356 xfs_fsblock_t firstblock;
357 xfs_bmap_free_t flist;
359 int nmaps, error, committed;
361 xfs_trans_t *tp = *tpp;
365 trace_xfs_dqalloc(dqp);
368 * Initialize the bmap freelist prior to calling bmapi code.
370 xfs_bmap_init(&flist, &firstblock);
371 xfs_ilock(quotip, XFS_ILOCK_EXCL);
373 * Return if this type of quotas is turned off while we didn't
376 if (XFS_IS_THIS_QUOTA_OFF(dqp)) {
377 xfs_iunlock(quotip, XFS_ILOCK_EXCL);
381 xfs_trans_ijoin_ref(tp, quotip, XFS_ILOCK_EXCL);
383 if ((error = xfs_bmapi(tp, quotip,
384 offset_fsb, XFS_DQUOT_CLUSTER_SIZE_FSB,
385 XFS_BMAPI_METADATA | XFS_BMAPI_WRITE,
387 XFS_QM_DQALLOC_SPACE_RES(mp),
388 &map, &nmaps, &flist))) {
391 ASSERT(map.br_blockcount == XFS_DQUOT_CLUSTER_SIZE_FSB);
393 ASSERT((map.br_startblock != DELAYSTARTBLOCK) &&
394 (map.br_startblock != HOLESTARTBLOCK));
397 * Keep track of the blkno to save a lookup later
399 dqp->q_blkno = XFS_FSB_TO_DADDR(mp, map.br_startblock);
401 /* now we can just get the buffer (there's nothing to read yet) */
402 bp = xfs_trans_get_buf(tp, mp->m_ddev_targp,
404 mp->m_quotainfo->qi_dqchunklen,
406 if (!bp || (error = XFS_BUF_GETERROR(bp)))
409 * Make a chunk of dquots out of this buffer and log
412 xfs_qm_init_dquot_blk(tp, mp, be32_to_cpu(dqp->q_core.d_id),
413 dqp->dq_flags & XFS_DQ_ALLTYPES, bp);
416 * xfs_bmap_finish() may commit the current transaction and
417 * start a second transaction if the freelist is not empty.
419 * Since we still want to modify this buffer, we need to
420 * ensure that the buffer is not released on commit of
421 * the first transaction and ensure the buffer is added to the
422 * second transaction.
424 * If there is only one transaction then don't stop the buffer
425 * from being released when it commits later on.
428 xfs_trans_bhold(tp, bp);
430 if ((error = xfs_bmap_finish(tpp, &flist, &committed))) {
436 xfs_trans_bjoin(tp, bp);
438 xfs_trans_bhold_release(tp, bp);
445 xfs_bmap_cancel(&flist);
447 xfs_iunlock(quotip, XFS_ILOCK_EXCL);
453 * Maps a dquot to the buffer containing its on-disk version.
454 * This returns a ptr to the buffer containing the on-disk dquot
455 * in the bpp param, and a ptr to the on-disk dquot within that buffer
461 xfs_disk_dquot_t **O_ddpp,
466 int nmaps = 1, error;
468 xfs_inode_t *quotip = XFS_DQ_TO_QIP(dqp);
469 xfs_mount_t *mp = dqp->q_mount;
470 xfs_disk_dquot_t *ddq;
471 xfs_dqid_t id = be32_to_cpu(dqp->q_core.d_id);
472 xfs_trans_t *tp = (tpp ? *tpp : NULL);
474 dqp->q_fileoffset = (xfs_fileoff_t)id / mp->m_quotainfo->qi_dqperchunk;
476 xfs_ilock(quotip, XFS_ILOCK_SHARED);
477 if (XFS_IS_THIS_QUOTA_OFF(dqp)) {
479 * Return if this type of quotas is turned off while we
480 * didn't have the quota inode lock.
482 xfs_iunlock(quotip, XFS_ILOCK_SHARED);
487 * Find the block map; no allocations yet
489 error = xfs_bmapi(NULL, quotip, dqp->q_fileoffset,
490 XFS_DQUOT_CLUSTER_SIZE_FSB, XFS_BMAPI_METADATA,
491 NULL, 0, &map, &nmaps, NULL);
493 xfs_iunlock(quotip, XFS_ILOCK_SHARED);
498 ASSERT(map.br_blockcount == 1);
501 * Offset of dquot in the (fixed sized) dquot chunk.
503 dqp->q_bufoffset = (id % mp->m_quotainfo->qi_dqperchunk) *
506 ASSERT(map.br_startblock != DELAYSTARTBLOCK);
507 if (map.br_startblock == HOLESTARTBLOCK) {
509 * We don't allocate unless we're asked to
511 if (!(flags & XFS_QMOPT_DQALLOC))
515 error = xfs_qm_dqalloc(tpp, mp, dqp, quotip,
516 dqp->q_fileoffset, &bp);
521 trace_xfs_dqtobp_read(dqp);
524 * store the blkno etc so that we don't have to do the
525 * mapping all the time
527 dqp->q_blkno = XFS_FSB_TO_DADDR(mp, map.br_startblock);
529 error = xfs_trans_read_buf(mp, tp, mp->m_ddev_targp,
531 mp->m_quotainfo->qi_dqchunklen,
534 return XFS_ERROR(error);
537 ASSERT(XFS_BUF_ISBUSY(bp));
538 ASSERT(XFS_BUF_VALUSEMA(bp) <= 0);
541 * calculate the location of the dquot inside the buffer.
543 ddq = (struct xfs_disk_dquot *)(XFS_BUF_PTR(bp) + dqp->q_bufoffset);
546 * A simple sanity check in case we got a corrupted dquot...
548 if (xfs_qm_dqcheck(ddq, id, dqp->dq_flags & XFS_DQ_ALLTYPES,
549 flags & (XFS_QMOPT_DQREPAIR|XFS_QMOPT_DOWARN),
551 if (!(flags & XFS_QMOPT_DQREPAIR)) {
552 xfs_trans_brelse(tp, bp);
553 return XFS_ERROR(EIO);
555 XFS_BUF_BUSY(bp); /* We dirtied this */
566 * Read in the ondisk dquot using dqtobp() then copy it to an incore version,
567 * and release the buffer immediately.
575 xfs_dquot_t *dqp, /* dquot to get filled in */
578 xfs_disk_dquot_t *ddqp;
585 trace_xfs_dqread(dqp);
588 * get a pointer to the on-disk dquot and the buffer containing it
589 * dqp already knows its own type (GROUP/USER).
591 if ((error = xfs_qm_dqtobp(tpp, dqp, &ddqp, &bp, flags))) {
596 /* copy everything from disk dquot to the incore dquot */
597 memcpy(&dqp->q_core, ddqp, sizeof(xfs_disk_dquot_t));
598 ASSERT(be32_to_cpu(dqp->q_core.d_id) == id);
599 xfs_qm_dquot_logitem_init(dqp);
602 * Reservation counters are defined as reservation plus current usage
603 * to avoid having to add everytime.
605 dqp->q_res_bcount = be64_to_cpu(ddqp->d_bcount);
606 dqp->q_res_icount = be64_to_cpu(ddqp->d_icount);
607 dqp->q_res_rtbcount = be64_to_cpu(ddqp->d_rtbcount);
609 /* Mark the buf so that this will stay incore a little longer */
610 XFS_BUF_SET_VTYPE_REF(bp, B_FS_DQUOT, XFS_DQUOT_REF);
613 * We got the buffer with a xfs_trans_read_buf() (in dqtobp())
614 * So we need to release with xfs_trans_brelse().
615 * The strategy here is identical to that of inodes; we lock
616 * the dquot in xfs_qm_dqget() before making it accessible to
617 * others. This is because dquots, like inodes, need a good level of
618 * concurrency, and we don't want to take locks on the entire buffers
619 * for dquot accesses.
620 * Note also that the dquot buffer may even be dirty at this point, if
621 * this particular dquot was repaired. We still aren't afraid to
622 * brelse it because we have the changes incore.
624 ASSERT(XFS_BUF_ISBUSY(bp));
625 ASSERT(XFS_BUF_VALUSEMA(bp) <= 0);
626 xfs_trans_brelse(tp, bp);
633 * allocate an incore dquot from the kernel heap,
634 * and fill its core with quota information kept on disk.
635 * If XFS_QMOPT_DQALLOC is set, it'll allocate a dquot on disk
636 * if it wasn't already allocated.
641 xfs_dqid_t id, /* gid or uid, depending on type */
642 uint type, /* UDQUOT or GDQUOT */
643 uint flags, /* DQALLOC, DQREPAIR */
644 xfs_dquot_t **O_dqpp)/* OUT : incore dquot, not locked */
651 dqp = xfs_qm_dqinit(mp, id, type);
653 if (flags & XFS_QMOPT_DQALLOC) {
654 tp = xfs_trans_alloc(mp, XFS_TRANS_QM_DQALLOC);
655 error = xfs_trans_reserve(tp, XFS_QM_DQALLOC_SPACE_RES(mp),
656 XFS_WRITE_LOG_RES(mp) +
657 BBTOB(mp->m_quotainfo->qi_dqchunklen) - 1 +
660 XFS_TRANS_PERM_LOG_RES,
661 XFS_WRITE_LOG_COUNT);
666 cancelflags = XFS_TRANS_RELEASE_LOG_RES;
670 * Read it from disk; xfs_dqread() takes care of
671 * all the necessary initialization of dquot's fields (locks, etc)
673 if ((error = xfs_qm_dqread(&tp, id, dqp, flags))) {
675 * This can happen if quotas got turned off (ESRCH),
676 * or if the dquot didn't exist on disk and we ask to
679 trace_xfs_dqread_fail(dqp);
680 cancelflags |= XFS_TRANS_ABORT;
684 if ((error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES)))
694 xfs_trans_cancel(tp, cancelflags);
696 xfs_qm_dqdestroy(dqp);
702 * Lookup a dquot in the incore dquot hashtable. We keep two separate
703 * hashtables for user and group dquots; and, these are global tables
704 * inside the XQM, not per-filesystem tables.
705 * The hash chain must be locked by caller, and it is left locked
706 * on return. Returning dquot is locked.
713 xfs_dquot_t **O_dqpp)
718 ASSERT(mutex_is_locked(&qh->qh_lock));
720 flist_locked = B_FALSE;
723 * Traverse the hashchain looking for a match
725 list_for_each_entry(dqp, &qh->qh_list, q_hashlist) {
727 * We already have the hashlock. We don't need the
728 * dqlock to look at the id field of the dquot, since the
729 * id can't be modified without the hashlock anyway.
731 if (be32_to_cpu(dqp->q_core.d_id) == id && dqp->q_mount == mp) {
732 trace_xfs_dqlookup_found(dqp);
735 * All in core dquots must be on the dqlist of mp
737 ASSERT(!list_empty(&dqp->q_mplist));
740 if (dqp->q_nrefs == 0) {
741 ASSERT(!list_empty(&dqp->q_freelist));
742 if (!mutex_trylock(&xfs_Gqm->qm_dqfrlist_lock)) {
743 trace_xfs_dqlookup_want(dqp);
746 * We may have raced with dqreclaim_one()
747 * (and lost). So, flag that we don't
748 * want the dquot to be reclaimed.
750 dqp->dq_flags |= XFS_DQ_WANT;
752 mutex_lock(&xfs_Gqm->qm_dqfrlist_lock);
754 dqp->dq_flags &= ~(XFS_DQ_WANT);
756 flist_locked = B_TRUE;
760 * id couldn't have changed; we had the hashlock all
763 ASSERT(be32_to_cpu(dqp->q_core.d_id) == id);
766 if (dqp->q_nrefs != 0) {
767 mutex_unlock(&xfs_Gqm->qm_dqfrlist_lock);
768 flist_locked = B_FALSE;
770 /* take it off the freelist */
771 trace_xfs_dqlookup_freelist(dqp);
772 list_del_init(&dqp->q_freelist);
773 xfs_Gqm->qm_dqfrlist_cnt--;
780 mutex_unlock(&xfs_Gqm->qm_dqfrlist_lock);
782 * move the dquot to the front of the hashchain
784 ASSERT(mutex_is_locked(&qh->qh_lock));
785 list_move(&dqp->q_hashlist, &qh->qh_list);
786 trace_xfs_dqlookup_done(dqp);
793 ASSERT(mutex_is_locked(&qh->qh_lock));
798 * Given the file system, inode OR id, and type (UDQUOT/GDQUOT), return a
799 * a locked dquot, doing an allocation (if requested) as needed.
800 * When both an inode and an id are given, the inode's id takes precedence.
801 * That is, if the id changes while we don't hold the ilock inside this
802 * function, the new dquot is returned, not necessarily the one requested
803 * in the id argument.
808 xfs_inode_t *ip, /* locked inode (optional) */
809 xfs_dqid_t id, /* uid/projid/gid depending on type */
810 uint type, /* XFS_DQ_USER/XFS_DQ_PROJ/XFS_DQ_GROUP */
811 uint flags, /* DQALLOC, DQSUSER, DQREPAIR, DOWARN */
812 xfs_dquot_t **O_dqpp) /* OUT : locked incore dquot */
819 ASSERT(XFS_IS_QUOTA_RUNNING(mp));
820 if ((! XFS_IS_UQUOTA_ON(mp) && type == XFS_DQ_USER) ||
821 (! XFS_IS_PQUOTA_ON(mp) && type == XFS_DQ_PROJ) ||
822 (! XFS_IS_GQUOTA_ON(mp) && type == XFS_DQ_GROUP)) {
825 h = XFS_DQ_HASH(mp, id, type);
828 if (xfs_do_dqerror) {
829 if ((xfs_dqerror_target == mp->m_ddev_targp) &&
830 (xfs_dqreq_num++ % xfs_dqerror_mod) == 0) {
831 cmn_err(CE_DEBUG, "Returning error in dqget");
840 ASSERT(type == XFS_DQ_USER ||
841 type == XFS_DQ_PROJ ||
842 type == XFS_DQ_GROUP);
844 ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
845 if (type == XFS_DQ_USER)
846 ASSERT(ip->i_udquot == NULL);
848 ASSERT(ip->i_gdquot == NULL);
851 mutex_lock(&h->qh_lock);
854 * Look in the cache (hashtable).
855 * The chain is kept locked during lookup.
857 if (xfs_qm_dqlookup(mp, id, h, O_dqpp) == 0) {
858 XQM_STATS_INC(xqmstats.xs_qm_dqcachehits);
860 * The dquot was found, moved to the front of the chain,
861 * taken off the freelist if it was on it, and locked
862 * at this point. Just unlock the hashchain and return.
865 ASSERT(XFS_DQ_IS_LOCKED(*O_dqpp));
866 mutex_unlock(&h->qh_lock);
867 trace_xfs_dqget_hit(*O_dqpp);
868 return (0); /* success */
870 XQM_STATS_INC(xqmstats.xs_qm_dqcachemisses);
873 * Dquot cache miss. We don't want to keep the inode lock across
874 * a (potential) disk read. Also we don't want to deal with the lock
875 * ordering between quotainode and this inode. OTOH, dropping the inode
876 * lock here means dealing with a chown that can happen before
877 * we re-acquire the lock.
880 xfs_iunlock(ip, XFS_ILOCK_EXCL);
882 * Save the hashchain version stamp, and unlock the chain, so that
883 * we don't keep the lock across a disk read
885 version = h->qh_version;
886 mutex_unlock(&h->qh_lock);
889 * Allocate the dquot on the kernel heap, and read the ondisk
890 * portion off the disk. Also, do all the necessary initialization
891 * This can return ENOENT if dquot didn't exist on disk and we didn't
892 * ask it to allocate; ESRCH if quotas got turned off suddenly.
894 if ((error = xfs_qm_idtodq(mp, id, type,
895 flags & (XFS_QMOPT_DQALLOC|XFS_QMOPT_DQREPAIR|
899 xfs_ilock(ip, XFS_ILOCK_EXCL);
904 * See if this is mount code calling to look at the overall quota limits
905 * which are stored in the id == 0 user or group's dquot.
906 * Since we may not have done a quotacheck by this point, just return
907 * the dquot without attaching it to any hashtables, lists, etc, or even
908 * taking a reference.
909 * The caller must dqdestroy this once done.
911 if (flags & XFS_QMOPT_DQSUSER) {
918 * Dquot lock comes after hashlock in the lock ordering
921 xfs_ilock(ip, XFS_ILOCK_EXCL);
924 * A dquot could be attached to this inode by now, since
925 * we had dropped the ilock.
927 if (type == XFS_DQ_USER) {
928 if (!XFS_IS_UQUOTA_ON(mp)) {
929 /* inode stays locked on return */
930 xfs_qm_dqdestroy(dqp);
931 return XFS_ERROR(ESRCH);
934 xfs_qm_dqdestroy(dqp);
940 if (!XFS_IS_OQUOTA_ON(mp)) {
941 /* inode stays locked on return */
942 xfs_qm_dqdestroy(dqp);
943 return XFS_ERROR(ESRCH);
946 xfs_qm_dqdestroy(dqp);
955 * Hashlock comes after ilock in lock order
957 mutex_lock(&h->qh_lock);
958 if (version != h->qh_version) {
961 * Now, see if somebody else put the dquot in the
962 * hashtable before us. This can happen because we didn't
963 * keep the hashchain lock. We don't have to worry about
964 * lock order between the two dquots here since dqp isn't
965 * on any findable lists yet.
967 if (xfs_qm_dqlookup(mp, id, h, &tmpdqp) == 0) {
969 * Duplicate found. Just throw away the new dquot
972 xfs_qm_dqput(tmpdqp);
973 mutex_unlock(&h->qh_lock);
974 xfs_qm_dqdestroy(dqp);
975 XQM_STATS_INC(xqmstats.xs_qm_dquot_dups);
981 * Put the dquot at the beginning of the hash-chain and mp's list
982 * LOCK ORDER: hashlock, freelistlock, mplistlock, udqlock, gdqlock ..
984 ASSERT(mutex_is_locked(&h->qh_lock));
986 list_add(&dqp->q_hashlist, &h->qh_list);
990 * Attach this dquot to this filesystem's list of all dquots,
991 * kept inside the mount structure in m_quotainfo field
993 mutex_lock(&mp->m_quotainfo->qi_dqlist_lock);
996 * We return a locked dquot to the caller, with a reference taken
1001 list_add(&dqp->q_mplist, &mp->m_quotainfo->qi_dqlist);
1002 mp->m_quotainfo->qi_dquots++;
1003 mutex_unlock(&mp->m_quotainfo->qi_dqlist_lock);
1004 mutex_unlock(&h->qh_lock);
1006 ASSERT((ip == NULL) || xfs_isilocked(ip, XFS_ILOCK_EXCL));
1007 trace_xfs_dqget_miss(dqp);
1014 * Release a reference to the dquot (decrement ref-count)
1015 * and unlock it. If there is a group quota attached to this
1016 * dquot, carefully release that too without tripping over
1017 * deadlocks'n'stuff.
1025 ASSERT(dqp->q_nrefs > 0);
1026 ASSERT(XFS_DQ_IS_LOCKED(dqp));
1028 trace_xfs_dqput(dqp);
1030 if (dqp->q_nrefs != 1) {
1037 * drop the dqlock and acquire the freelist and dqlock
1038 * in the right order; but try to get it out-of-order first
1040 if (!mutex_trylock(&xfs_Gqm->qm_dqfrlist_lock)) {
1041 trace_xfs_dqput_wait(dqp);
1043 mutex_lock(&xfs_Gqm->qm_dqfrlist_lock);
1050 /* We can't depend on nrefs being == 1 here */
1051 if (--dqp->q_nrefs == 0) {
1052 trace_xfs_dqput_free(dqp);
1054 list_add_tail(&dqp->q_freelist, &xfs_Gqm->qm_dqfrlist);
1055 xfs_Gqm->qm_dqfrlist_cnt++;
1058 * If we just added a udquot to the freelist, then
1059 * we want to release the gdquot reference that
1060 * it (probably) has. Otherwise it'll keep the
1061 * gdquot from getting reclaimed.
1063 if ((gdqp = dqp->q_gdquot)) {
1065 * Avoid a recursive dqput call
1068 dqp->q_gdquot = NULL;
1074 * If we had a group quota inside the user quota as a hint,
1081 mutex_unlock(&xfs_Gqm->qm_dqfrlist_lock);
1085 * Release a dquot. Flush it if dirty, then dqput() it.
1086 * dquot must not be locked.
1095 trace_xfs_dqrele(dqp);
1099 * We don't care to flush it if the dquot is dirty here.
1100 * That will create stutters that we want to avoid.
1101 * Instead we do a delayed write when we try to reclaim
1102 * a dirty dquot. Also xfs_sync will take part of the burden...
1108 * This is the dquot flushing I/O completion routine. It is called
1109 * from interrupt level when the buffer containing the dquot is
1110 * flushed to disk. It is responsible for removing the dquot logitem
1111 * from the AIL if it has not been re-logged, and unlocking the dquot's
1112 * flush lock. This behavior is very similar to that of inodes..
1115 xfs_qm_dqflush_done(
1117 struct xfs_log_item *lip)
1119 xfs_dq_logitem_t *qip = (struct xfs_dq_logitem *)lip;
1120 xfs_dquot_t *dqp = qip->qli_dquot;
1121 struct xfs_ail *ailp = lip->li_ailp;
1124 * We only want to pull the item from the AIL if its
1125 * location in the log has not changed since we started the flush.
1126 * Thus, we only bother if the dquot's lsn has
1127 * not changed. First we check the lsn outside the lock
1128 * since it's cheaper, and then we recheck while
1129 * holding the lock before removing the dquot from the AIL.
1131 if ((lip->li_flags & XFS_LI_IN_AIL) &&
1132 lip->li_lsn == qip->qli_flush_lsn) {
1134 /* xfs_trans_ail_delete() drops the AIL lock. */
1135 spin_lock(&ailp->xa_lock);
1136 if (lip->li_lsn == qip->qli_flush_lsn)
1137 xfs_trans_ail_delete(ailp, lip);
1139 spin_unlock(&ailp->xa_lock);
1143 * Release the dq's flush lock since we're done with it.
1149 * Write a modified dquot to disk.
1150 * The dquot must be locked and the flush lock too taken by caller.
1151 * The flush lock will not be unlocked until the dquot reaches the disk,
1152 * but the dquot is free to be unlocked and modified by the caller
1153 * in the interim. Dquot is still locked on return. This behavior is
1154 * identical to that of inodes.
1161 struct xfs_mount *mp = dqp->q_mount;
1163 struct xfs_disk_dquot *ddqp;
1166 ASSERT(XFS_DQ_IS_LOCKED(dqp));
1167 ASSERT(!completion_done(&dqp->q_flush));
1169 trace_xfs_dqflush(dqp);
1172 * If not dirty, or it's pinned and we are not supposed to block, nada.
1174 if (!XFS_DQ_IS_DIRTY(dqp) ||
1175 (!(flags & SYNC_WAIT) && atomic_read(&dqp->q_pincount) > 0)) {
1179 xfs_qm_dqunpin_wait(dqp);
1182 * This may have been unpinned because the filesystem is shutting
1183 * down forcibly. If that's the case we must not write this dquot
1184 * to disk, because the log record didn't make it to disk!
1186 if (XFS_FORCED_SHUTDOWN(mp)) {
1187 dqp->dq_flags &= ~XFS_DQ_DIRTY;
1189 return XFS_ERROR(EIO);
1193 * Get the buffer containing the on-disk dquot
1195 error = xfs_trans_read_buf(mp, NULL, mp->m_ddev_targp, dqp->q_blkno,
1196 mp->m_quotainfo->qi_dqchunklen, 0, &bp);
1198 ASSERT(error != ENOENT);
1204 * Calculate the location of the dquot inside the buffer.
1206 ddqp = (struct xfs_disk_dquot *)(XFS_BUF_PTR(bp) + dqp->q_bufoffset);
1209 * A simple sanity check in case we got a corrupted dquot..
1211 if (xfs_qm_dqcheck(&dqp->q_core, be32_to_cpu(ddqp->d_id), 0,
1212 XFS_QMOPT_DOWARN, "dqflush (incore copy)")) {
1215 xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE);
1216 return XFS_ERROR(EIO);
1219 /* This is the only portion of data that needs to persist */
1220 memcpy(ddqp, &dqp->q_core, sizeof(xfs_disk_dquot_t));
1223 * Clear the dirty field and remember the flush lsn for later use.
1225 dqp->dq_flags &= ~XFS_DQ_DIRTY;
1227 xfs_trans_ail_copy_lsn(mp->m_ail, &dqp->q_logitem.qli_flush_lsn,
1228 &dqp->q_logitem.qli_item.li_lsn);
1231 * Attach an iodone routine so that we can remove this dquot from the
1232 * AIL and release the flush lock once the dquot is synced to disk.
1234 xfs_buf_attach_iodone(bp, xfs_qm_dqflush_done,
1235 &dqp->q_logitem.qli_item);
1238 * If the buffer is pinned then push on the log so we won't
1239 * get stuck waiting in the write for too long.
1241 if (XFS_BUF_ISPINNED(bp)) {
1242 trace_xfs_dqflush_force(dqp);
1243 xfs_log_force(mp, 0);
1246 if (flags & SYNC_WAIT)
1247 error = xfs_bwrite(mp, bp);
1249 xfs_bdwrite(mp, bp);
1251 trace_xfs_dqflush_done(dqp);
1254 * dqp is still locked, but caller is free to unlock it now.
1261 xfs_qm_dqlock_nowait(
1264 return mutex_trylock(&dqp->q_qlock);
1271 mutex_lock(&dqp->q_qlock);
1278 mutex_unlock(&(dqp->q_qlock));
1279 if (dqp->q_logitem.qli_dquot == dqp) {
1280 /* Once was dqp->q_mount, but might just have been cleared */
1281 xfs_trans_unlocked_item(dqp->q_logitem.qli_item.li_ailp,
1282 (xfs_log_item_t*)&(dqp->q_logitem));
1288 xfs_dqunlock_nonotify(
1291 mutex_unlock(&(dqp->q_qlock));
1295 * Lock two xfs_dquot structures.
1297 * To avoid deadlocks we always lock the quota structure with
1298 * the lowerd id first.
1307 if (be32_to_cpu(d1->q_core.d_id) >
1308 be32_to_cpu(d2->q_core.d_id)) {
1309 mutex_lock(&d2->q_qlock);
1310 mutex_lock_nested(&d1->q_qlock, XFS_QLOCK_NESTED);
1312 mutex_lock(&d1->q_qlock);
1313 mutex_lock_nested(&d2->q_qlock, XFS_QLOCK_NESTED);
1316 mutex_lock(&d1->q_qlock);
1318 mutex_lock(&d2->q_qlock);
1324 * Take a dquot out of the mount's dqlist as well as the hashlist.
1325 * This is called via unmount as well as quotaoff, and the purge
1326 * will always succeed unless there are soft (temp) references
1329 * This returns 0 if it was purged, 1 if it wasn't. It's not an error code
1330 * that we're returning! XXXsup - not cool.
1337 xfs_dqhash_t *qh = dqp->q_hash;
1338 xfs_mount_t *mp = dqp->q_mount;
1340 ASSERT(mutex_is_locked(&mp->m_quotainfo->qi_dqlist_lock));
1341 ASSERT(mutex_is_locked(&dqp->q_hash->qh_lock));
1345 * We really can't afford to purge a dquot that is
1346 * referenced, because these are hard refs.
1347 * It shouldn't happen in general because we went thru _all_ inodes in
1348 * dqrele_all_inodes before calling this and didn't let the mountlock go.
1349 * However it is possible that we have dquots with temporary
1350 * references that are not attached to an inode. e.g. see xfs_setattr().
1352 if (dqp->q_nrefs != 0) {
1354 mutex_unlock(&dqp->q_hash->qh_lock);
1358 ASSERT(!list_empty(&dqp->q_freelist));
1361 * If we're turning off quotas, we have to make sure that, for
1362 * example, we don't delete quota disk blocks while dquots are
1363 * in the process of getting written to those disk blocks.
1364 * This dquot might well be on AIL, and we can't leave it there
1365 * if we're turning off quotas. Basically, we need this flush
1366 * lock, and are willing to block on it.
1368 if (!xfs_dqflock_nowait(dqp)) {
1370 * Block on the flush lock after nudging dquot buffer,
1373 xfs_qm_dqflock_pushbuf_wait(dqp);
1377 * XXXIf we're turning this type of quotas off, we don't care
1378 * about the dirty metadata sitting in this dquot. OTOH, if
1379 * we're unmounting, we do care, so we flush it and wait.
1381 if (XFS_DQ_IS_DIRTY(dqp)) {
1384 /* dqflush unlocks dqflock */
1386 * Given that dqpurge is a very rare occurrence, it is OK
1387 * that we're holding the hashlist and mplist locks
1388 * across the disk write. But, ... XXXsup
1390 * We don't care about getting disk errors here. We need
1391 * to purge this dquot anyway, so we go ahead regardless.
1393 error = xfs_qm_dqflush(dqp, SYNC_WAIT);
1395 xfs_fs_cmn_err(CE_WARN, mp,
1396 "xfs_qm_dqpurge: dquot %p flush failed", dqp);
1399 ASSERT(atomic_read(&dqp->q_pincount) == 0);
1400 ASSERT(XFS_FORCED_SHUTDOWN(mp) ||
1401 !(dqp->q_logitem.qli_item.li_flags & XFS_LI_IN_AIL));
1403 list_del_init(&dqp->q_hashlist);
1405 list_del_init(&dqp->q_mplist);
1406 mp->m_quotainfo->qi_dqreclaims++;
1407 mp->m_quotainfo->qi_dquots--;
1409 * XXX Move this to the front of the freelist, if we can get the
1412 ASSERT(!list_empty(&dqp->q_freelist));
1414 dqp->q_mount = NULL;
1416 dqp->dq_flags = XFS_DQ_INACTIVE;
1417 memset(&dqp->q_core, 0, sizeof(dqp->q_core));
1420 mutex_unlock(&qh->qh_lock);
1427 xfs_qm_dqprint(xfs_dquot_t *dqp)
1429 cmn_err(CE_DEBUG, "-----------KERNEL DQUOT----------------");
1430 cmn_err(CE_DEBUG, "---- dquotID = %d",
1431 (int)be32_to_cpu(dqp->q_core.d_id));
1432 cmn_err(CE_DEBUG, "---- type = %s", DQFLAGTO_TYPESTR(dqp));
1433 cmn_err(CE_DEBUG, "---- fs = 0x%p", dqp->q_mount);
1434 cmn_err(CE_DEBUG, "---- blkno = 0x%x", (int) dqp->q_blkno);
1435 cmn_err(CE_DEBUG, "---- boffset = 0x%x", (int) dqp->q_bufoffset);
1436 cmn_err(CE_DEBUG, "---- blkhlimit = %Lu (0x%x)",
1437 be64_to_cpu(dqp->q_core.d_blk_hardlimit),
1438 (int)be64_to_cpu(dqp->q_core.d_blk_hardlimit));
1439 cmn_err(CE_DEBUG, "---- blkslimit = %Lu (0x%x)",
1440 be64_to_cpu(dqp->q_core.d_blk_softlimit),
1441 (int)be64_to_cpu(dqp->q_core.d_blk_softlimit));
1442 cmn_err(CE_DEBUG, "---- inohlimit = %Lu (0x%x)",
1443 be64_to_cpu(dqp->q_core.d_ino_hardlimit),
1444 (int)be64_to_cpu(dqp->q_core.d_ino_hardlimit));
1445 cmn_err(CE_DEBUG, "---- inoslimit = %Lu (0x%x)",
1446 be64_to_cpu(dqp->q_core.d_ino_softlimit),
1447 (int)be64_to_cpu(dqp->q_core.d_ino_softlimit));
1448 cmn_err(CE_DEBUG, "---- bcount = %Lu (0x%x)",
1449 be64_to_cpu(dqp->q_core.d_bcount),
1450 (int)be64_to_cpu(dqp->q_core.d_bcount));
1451 cmn_err(CE_DEBUG, "---- icount = %Lu (0x%x)",
1452 be64_to_cpu(dqp->q_core.d_icount),
1453 (int)be64_to_cpu(dqp->q_core.d_icount));
1454 cmn_err(CE_DEBUG, "---- btimer = %d",
1455 (int)be32_to_cpu(dqp->q_core.d_btimer));
1456 cmn_err(CE_DEBUG, "---- itimer = %d",
1457 (int)be32_to_cpu(dqp->q_core.d_itimer));
1458 cmn_err(CE_DEBUG, "---------------------------");
1463 * Give the buffer a little push if it is incore and
1464 * wait on the flush lock.
1467 xfs_qm_dqflock_pushbuf_wait(
1470 xfs_mount_t *mp = dqp->q_mount;
1474 * Check to see if the dquot has been flushed delayed
1475 * write. If so, grab its buffer and send it
1476 * out immediately. We'll be able to acquire
1477 * the flush lock when the I/O completes.
1479 bp = xfs_incore(mp->m_ddev_targp, dqp->q_blkno,
1480 mp->m_quotainfo->qi_dqchunklen, XBF_TRYLOCK);
1484 if (XFS_BUF_ISDELAYWRITE(bp)) {
1485 if (XFS_BUF_ISPINNED(bp))
1486 xfs_log_force(mp, 0);
1487 xfs_buf_delwri_promote(bp);
1488 wake_up_process(bp->b_target->bt_task);