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
20 #include "xfs_format.h"
21 #include "xfs_log_format.h"
22 #include "xfs_shared.h"
23 #include "xfs_trans_resv.h"
25 #include "xfs_mount.h"
26 #include "xfs_inode.h"
28 #include "xfs_bmap_util.h"
29 #include "xfs_alloc.h"
30 #include "xfs_quota.h"
31 #include "xfs_error.h"
32 #include "xfs_trans.h"
33 #include "xfs_buf_item.h"
34 #include "xfs_trans_space.h"
35 #include "xfs_trans_priv.h"
37 #include "xfs_cksum.h"
38 #include "xfs_trace.h"
40 #include "xfs_bmap_btree.h"
47 * dquot->q_qlock (xfs_dqlock() and friends)
48 * dquot->q_flush (xfs_dqflock() and friends)
51 * If two dquots need to be locked the order is user before group/project,
52 * otherwise by the lowest id first, see xfs_dqlock2.
56 xfs_buftarg_t *xfs_dqerror_target;
59 int xfs_dqerror_mod = 33;
62 struct kmem_zone *xfs_qm_dqtrxzone;
63 static struct kmem_zone *xfs_qm_dqzone;
65 static struct lock_class_key xfs_dquot_group_class;
66 static struct lock_class_key xfs_dquot_project_class;
69 * This is called to free all the memory associated with a dquot
75 ASSERT(list_empty(&dqp->q_lru));
77 mutex_destroy(&dqp->q_qlock);
79 XFS_STATS_DEC(dqp->q_mount, xs_qm_dquot);
80 kmem_zone_free(xfs_qm_dqzone, dqp);
84 * If default limits are in force, push them into the dquot now.
85 * We overwrite the dquot limits only if they are zero and this
86 * is not the root dquot.
89 xfs_qm_adjust_dqlimits(
93 struct xfs_quotainfo *q = mp->m_quotainfo;
94 struct xfs_disk_dquot *d = &dq->q_core;
95 struct xfs_def_quota *defq;
99 defq = xfs_get_defquota(dq, q);
101 if (defq->bsoftlimit && !d->d_blk_softlimit) {
102 d->d_blk_softlimit = cpu_to_be64(defq->bsoftlimit);
105 if (defq->bhardlimit && !d->d_blk_hardlimit) {
106 d->d_blk_hardlimit = cpu_to_be64(defq->bhardlimit);
109 if (defq->isoftlimit && !d->d_ino_softlimit)
110 d->d_ino_softlimit = cpu_to_be64(defq->isoftlimit);
111 if (defq->ihardlimit && !d->d_ino_hardlimit)
112 d->d_ino_hardlimit = cpu_to_be64(defq->ihardlimit);
113 if (defq->rtbsoftlimit && !d->d_rtb_softlimit)
114 d->d_rtb_softlimit = cpu_to_be64(defq->rtbsoftlimit);
115 if (defq->rtbhardlimit && !d->d_rtb_hardlimit)
116 d->d_rtb_hardlimit = cpu_to_be64(defq->rtbhardlimit);
119 xfs_dquot_set_prealloc_limits(dq);
123 * Check the limits and timers of a dquot and start or reset timers
125 * This gets called even when quota enforcement is OFF, which makes our
126 * life a little less complicated. (We just don't reject any quota
127 * reservations in that case, when enforcement is off).
128 * We also return 0 as the values of the timers in Q_GETQUOTA calls, when
130 * In contrast, warnings are a little different in that they don't
131 * 'automatically' get started when limits get exceeded. They do
132 * get reset to zero, however, when we find the count to be under
133 * the soft limit (they are only ever set non-zero via userspace).
136 xfs_qm_adjust_dqtimers(
143 if (d->d_blk_hardlimit)
144 ASSERT(be64_to_cpu(d->d_blk_softlimit) <=
145 be64_to_cpu(d->d_blk_hardlimit));
146 if (d->d_ino_hardlimit)
147 ASSERT(be64_to_cpu(d->d_ino_softlimit) <=
148 be64_to_cpu(d->d_ino_hardlimit));
149 if (d->d_rtb_hardlimit)
150 ASSERT(be64_to_cpu(d->d_rtb_softlimit) <=
151 be64_to_cpu(d->d_rtb_hardlimit));
155 if ((d->d_blk_softlimit &&
156 (be64_to_cpu(d->d_bcount) >
157 be64_to_cpu(d->d_blk_softlimit))) ||
158 (d->d_blk_hardlimit &&
159 (be64_to_cpu(d->d_bcount) >
160 be64_to_cpu(d->d_blk_hardlimit)))) {
161 d->d_btimer = cpu_to_be32(get_seconds() +
162 mp->m_quotainfo->qi_btimelimit);
167 if ((!d->d_blk_softlimit ||
168 (be64_to_cpu(d->d_bcount) <=
169 be64_to_cpu(d->d_blk_softlimit))) &&
170 (!d->d_blk_hardlimit ||
171 (be64_to_cpu(d->d_bcount) <=
172 be64_to_cpu(d->d_blk_hardlimit)))) {
178 if ((d->d_ino_softlimit &&
179 (be64_to_cpu(d->d_icount) >
180 be64_to_cpu(d->d_ino_softlimit))) ||
181 (d->d_ino_hardlimit &&
182 (be64_to_cpu(d->d_icount) >
183 be64_to_cpu(d->d_ino_hardlimit)))) {
184 d->d_itimer = cpu_to_be32(get_seconds() +
185 mp->m_quotainfo->qi_itimelimit);
190 if ((!d->d_ino_softlimit ||
191 (be64_to_cpu(d->d_icount) <=
192 be64_to_cpu(d->d_ino_softlimit))) &&
193 (!d->d_ino_hardlimit ||
194 (be64_to_cpu(d->d_icount) <=
195 be64_to_cpu(d->d_ino_hardlimit)))) {
200 if (!d->d_rtbtimer) {
201 if ((d->d_rtb_softlimit &&
202 (be64_to_cpu(d->d_rtbcount) >
203 be64_to_cpu(d->d_rtb_softlimit))) ||
204 (d->d_rtb_hardlimit &&
205 (be64_to_cpu(d->d_rtbcount) >
206 be64_to_cpu(d->d_rtb_hardlimit)))) {
207 d->d_rtbtimer = cpu_to_be32(get_seconds() +
208 mp->m_quotainfo->qi_rtbtimelimit);
213 if ((!d->d_rtb_softlimit ||
214 (be64_to_cpu(d->d_rtbcount) <=
215 be64_to_cpu(d->d_rtb_softlimit))) &&
216 (!d->d_rtb_hardlimit ||
217 (be64_to_cpu(d->d_rtbcount) <=
218 be64_to_cpu(d->d_rtb_hardlimit)))) {
225 * initialize a buffer full of dquots and log the whole thing
228 xfs_qm_init_dquot_blk(
235 struct xfs_quotainfo *q = mp->m_quotainfo;
241 ASSERT(xfs_buf_islocked(bp));
246 * ID of the first dquot in the block - id's are zero based.
248 curid = id - (id % q->qi_dqperchunk);
249 memset(d, 0, BBTOB(q->qi_dqchunklen));
250 for (i = 0; i < q->qi_dqperchunk; i++, d++, curid++) {
251 d->dd_diskdq.d_magic = cpu_to_be16(XFS_DQUOT_MAGIC);
252 d->dd_diskdq.d_version = XFS_DQUOT_VERSION;
253 d->dd_diskdq.d_id = cpu_to_be32(curid);
254 d->dd_diskdq.d_flags = type;
255 if (xfs_sb_version_hascrc(&mp->m_sb)) {
256 uuid_copy(&d->dd_uuid, &mp->m_sb.sb_meta_uuid);
257 xfs_update_cksum((char *)d, sizeof(struct xfs_dqblk),
262 xfs_trans_dquot_buf(tp, bp,
263 (type & XFS_DQ_USER ? XFS_BLF_UDQUOT_BUF :
264 ((type & XFS_DQ_PROJ) ? XFS_BLF_PDQUOT_BUF :
265 XFS_BLF_GDQUOT_BUF)));
266 xfs_trans_log_buf(tp, bp, 0, BBTOB(q->qi_dqchunklen) - 1);
270 * Initialize the dynamic speculative preallocation thresholds. The lo/hi
271 * watermarks correspond to the soft and hard limits by default. If a soft limit
272 * is not specified, we use 95% of the hard limit.
275 xfs_dquot_set_prealloc_limits(struct xfs_dquot *dqp)
279 dqp->q_prealloc_hi_wmark = be64_to_cpu(dqp->q_core.d_blk_hardlimit);
280 dqp->q_prealloc_lo_wmark = be64_to_cpu(dqp->q_core.d_blk_softlimit);
281 if (!dqp->q_prealloc_lo_wmark) {
282 dqp->q_prealloc_lo_wmark = dqp->q_prealloc_hi_wmark;
283 do_div(dqp->q_prealloc_lo_wmark, 100);
284 dqp->q_prealloc_lo_wmark *= 95;
287 space = dqp->q_prealloc_hi_wmark;
290 dqp->q_low_space[XFS_QLOWSP_1_PCNT] = space;
291 dqp->q_low_space[XFS_QLOWSP_3_PCNT] = space * 3;
292 dqp->q_low_space[XFS_QLOWSP_5_PCNT] = space * 5;
296 * Allocate a block and fill it with dquots.
297 * This is called when the bmapi finds a hole.
305 xfs_fileoff_t offset_fsb,
308 xfs_fsblock_t firstblock;
309 xfs_bmap_free_t flist;
313 xfs_trans_t *tp = *tpp;
317 trace_xfs_dqalloc(dqp);
320 * Initialize the bmap freelist prior to calling bmapi code.
322 xfs_bmap_init(&flist, &firstblock);
323 xfs_ilock(quotip, XFS_ILOCK_EXCL);
325 * Return if this type of quotas is turned off while we didn't
328 if (!xfs_this_quota_on(dqp->q_mount, dqp->dq_flags)) {
329 xfs_iunlock(quotip, XFS_ILOCK_EXCL);
333 xfs_trans_ijoin(tp, quotip, XFS_ILOCK_EXCL);
335 error = xfs_bmapi_write(tp, quotip, offset_fsb,
336 XFS_DQUOT_CLUSTER_SIZE_FSB, XFS_BMAPI_METADATA,
337 &firstblock, XFS_QM_DQALLOC_SPACE_RES(mp),
338 &map, &nmaps, &flist);
341 ASSERT(map.br_blockcount == XFS_DQUOT_CLUSTER_SIZE_FSB);
343 ASSERT((map.br_startblock != DELAYSTARTBLOCK) &&
344 (map.br_startblock != HOLESTARTBLOCK));
347 * Keep track of the blkno to save a lookup later
349 dqp->q_blkno = XFS_FSB_TO_DADDR(mp, map.br_startblock);
351 /* now we can just get the buffer (there's nothing to read yet) */
352 bp = xfs_trans_get_buf(tp, mp->m_ddev_targp,
354 mp->m_quotainfo->qi_dqchunklen,
360 bp->b_ops = &xfs_dquot_buf_ops;
363 * Make a chunk of dquots out of this buffer and log
366 xfs_qm_init_dquot_blk(tp, mp, be32_to_cpu(dqp->q_core.d_id),
367 dqp->dq_flags & XFS_DQ_ALLTYPES, bp);
370 * xfs_bmap_finish() may commit the current transaction and
371 * start a second transaction if the freelist is not empty.
373 * Since we still want to modify this buffer, we need to
374 * ensure that the buffer is not released on commit of
375 * the first transaction and ensure the buffer is added to the
376 * second transaction.
378 * If there is only one transaction then don't stop the buffer
379 * from being released when it commits later on.
382 xfs_trans_bhold(tp, bp);
384 error = xfs_bmap_finish(tpp, &flist, NULL);
388 /* Transaction was committed? */
391 xfs_trans_bjoin(tp, bp);
393 xfs_trans_bhold_release(tp, bp);
400 xfs_bmap_cancel(&flist);
402 xfs_iunlock(quotip, XFS_ILOCK_EXCL);
409 struct xfs_mount *mp,
410 struct xfs_trans *tp,
411 struct xfs_dquot *dqp,
413 struct xfs_buf **bpp)
416 struct xfs_disk_dquot *ddq;
421 * Read the buffer without verification so we get the corrupted
422 * buffer returned to us. make sure we verify it on write, though.
424 error = xfs_trans_read_buf(mp, tp, mp->m_ddev_targp, dqp->q_blkno,
425 mp->m_quotainfo->qi_dqchunklen,
429 ASSERT(*bpp == NULL);
432 (*bpp)->b_ops = &xfs_dquot_buf_ops;
434 ASSERT(xfs_buf_islocked(*bpp));
435 d = (struct xfs_dqblk *)(*bpp)->b_addr;
437 /* Do the actual repair of dquots in this buffer */
438 for (i = 0; i < mp->m_quotainfo->qi_dqperchunk; i++) {
439 ddq = &d[i].dd_diskdq;
440 error = xfs_dqcheck(mp, ddq, firstid + i,
441 dqp->dq_flags & XFS_DQ_ALLTYPES,
442 XFS_QMOPT_DQREPAIR, "xfs_qm_dqrepair");
444 /* repair failed, we're screwed */
445 xfs_trans_brelse(tp, *bpp);
454 * Maps a dquot to the buffer containing its on-disk version.
455 * This returns a ptr to the buffer containing the on-disk dquot
456 * in the bpp param, and a ptr to the on-disk dquot within that buffer
462 xfs_disk_dquot_t **O_ddpp,
466 struct xfs_bmbt_irec map;
467 int nmaps = 1, error;
469 struct xfs_inode *quotip;
470 struct xfs_mount *mp = dqp->q_mount;
471 xfs_dqid_t id = be32_to_cpu(dqp->q_core.d_id);
472 struct xfs_trans *tp = (tpp ? *tpp : NULL);
475 quotip = xfs_quota_inode(dqp->q_mount, dqp->dq_flags);
476 dqp->q_fileoffset = (xfs_fileoff_t)id / mp->m_quotainfo->qi_dqperchunk;
478 lock_mode = xfs_ilock_data_map_shared(quotip);
479 if (!xfs_this_quota_on(dqp->q_mount, dqp->dq_flags)) {
481 * Return if this type of quotas is turned off while we
482 * didn't have the quota inode lock.
484 xfs_iunlock(quotip, lock_mode);
489 * Find the block map; no allocations yet
491 error = xfs_bmapi_read(quotip, dqp->q_fileoffset,
492 XFS_DQUOT_CLUSTER_SIZE_FSB, &map, &nmaps, 0);
494 xfs_iunlock(quotip, lock_mode);
499 ASSERT(map.br_blockcount == 1);
502 * Offset of dquot in the (fixed sized) dquot chunk.
504 dqp->q_bufoffset = (id % mp->m_quotainfo->qi_dqperchunk) *
507 ASSERT(map.br_startblock != DELAYSTARTBLOCK);
508 if (map.br_startblock == HOLESTARTBLOCK) {
510 * We don't allocate unless we're asked to
512 if (!(flags & XFS_QMOPT_DQALLOC))
516 error = xfs_qm_dqalloc(tpp, mp, dqp, quotip,
517 dqp->q_fileoffset, &bp);
522 trace_xfs_dqtobp_read(dqp);
525 * store the blkno etc so that we don't have to do the
526 * mapping all the time
528 dqp->q_blkno = XFS_FSB_TO_DADDR(mp, map.br_startblock);
530 error = xfs_trans_read_buf(mp, tp, mp->m_ddev_targp,
532 mp->m_quotainfo->qi_dqchunklen,
533 0, &bp, &xfs_dquot_buf_ops);
535 if (error == -EFSCORRUPTED && (flags & XFS_QMOPT_DQREPAIR)) {
536 xfs_dqid_t firstid = (xfs_dqid_t)map.br_startoff *
537 mp->m_quotainfo->qi_dqperchunk;
539 error = xfs_qm_dqrepair(mp, tp, dqp, firstid, &bp);
548 ASSERT(xfs_buf_islocked(bp));
550 *O_ddpp = bp->b_addr + dqp->q_bufoffset;
557 * Read in the ondisk dquot using dqtobp() then copy it to an incore version,
558 * and release the buffer immediately.
560 * If XFS_QMOPT_DQALLOC is set, allocate a dquot on disk if it needed.
564 struct xfs_mount *mp,
568 struct xfs_dquot **O_dqpp)
570 struct xfs_dquot *dqp;
571 struct xfs_disk_dquot *ddqp;
573 struct xfs_trans *tp = NULL;
576 dqp = kmem_zone_zalloc(xfs_qm_dqzone, KM_SLEEP);
578 dqp->dq_flags = type;
579 dqp->q_core.d_id = cpu_to_be32(id);
581 INIT_LIST_HEAD(&dqp->q_lru);
582 mutex_init(&dqp->q_qlock);
583 init_waitqueue_head(&dqp->q_pinwait);
586 * Because we want to use a counting completion, complete
587 * the flush completion once to allow a single access to
588 * the flush completion without blocking.
590 init_completion(&dqp->q_flush);
591 complete(&dqp->q_flush);
594 * Make sure group quotas have a different lock class than user
599 /* uses the default lock class */
602 lockdep_set_class(&dqp->q_qlock, &xfs_dquot_group_class);
605 lockdep_set_class(&dqp->q_qlock, &xfs_dquot_project_class);
612 XFS_STATS_INC(mp, xs_qm_dquot);
614 trace_xfs_dqread(dqp);
616 if (flags & XFS_QMOPT_DQALLOC) {
617 tp = xfs_trans_alloc(mp, XFS_TRANS_QM_DQALLOC);
618 error = xfs_trans_reserve(tp, &M_RES(mp)->tr_qm_dqalloc,
619 XFS_QM_DQALLOC_SPACE_RES(mp), 0);
625 * get a pointer to the on-disk dquot and the buffer containing it
626 * dqp already knows its own type (GROUP/USER).
628 error = xfs_qm_dqtobp(&tp, dqp, &ddqp, &bp, flags);
631 * This can happen if quotas got turned off (ESRCH),
632 * or if the dquot didn't exist on disk and we ask to
635 trace_xfs_dqread_fail(dqp);
639 /* copy everything from disk dquot to the incore dquot */
640 memcpy(&dqp->q_core, ddqp, sizeof(xfs_disk_dquot_t));
641 xfs_qm_dquot_logitem_init(dqp);
644 * Reservation counters are defined as reservation plus current usage
645 * to avoid having to add every time.
647 dqp->q_res_bcount = be64_to_cpu(ddqp->d_bcount);
648 dqp->q_res_icount = be64_to_cpu(ddqp->d_icount);
649 dqp->q_res_rtbcount = be64_to_cpu(ddqp->d_rtbcount);
651 /* initialize the dquot speculative prealloc thresholds */
652 xfs_dquot_set_prealloc_limits(dqp);
654 /* Mark the buf so that this will stay incore a little longer */
655 xfs_buf_set_ref(bp, XFS_DQUOT_REF);
658 * We got the buffer with a xfs_trans_read_buf() (in dqtobp())
659 * So we need to release with xfs_trans_brelse().
660 * The strategy here is identical to that of inodes; we lock
661 * the dquot in xfs_qm_dqget() before making it accessible to
662 * others. This is because dquots, like inodes, need a good level of
663 * concurrency, and we don't want to take locks on the entire buffers
664 * for dquot accesses.
665 * Note also that the dquot buffer may even be dirty at this point, if
666 * this particular dquot was repaired. We still aren't afraid to
667 * brelse it because we have the changes incore.
669 ASSERT(xfs_buf_islocked(bp));
670 xfs_trans_brelse(tp, bp);
673 error = xfs_trans_commit(tp);
683 xfs_trans_cancel(tp);
685 xfs_qm_dqdestroy(dqp);
691 * Advance to the next id in the current chunk, or if at the
692 * end of the chunk, skip ahead to first id in next allocated chunk
693 * using the SEEK_DATA interface.
702 struct xfs_inode *quotip;
712 /* If new ID is within the current chunk, advancing it sufficed */
713 if (next_id % mp->m_quotainfo->qi_dqperchunk) {
718 /* Nope, next_id is now past the current chunk, so find the next one */
719 start = (xfs_fsblock_t)next_id / mp->m_quotainfo->qi_dqperchunk;
721 quotip = xfs_quota_inode(mp, type);
722 lock = xfs_ilock_data_map_shared(quotip);
724 offset = __xfs_seek_hole_data(VFS_I(quotip), XFS_FSB_TO_B(mp, start),
729 xfs_iunlock(quotip, lock);
731 /* -ENXIO is essentially "no more data" */
733 return (error == -ENXIO ? -ENOENT: error);
735 /* Convert next data offset back to a quota id */
736 *id = XFS_B_TO_FSB(mp, offset) * mp->m_quotainfo->qi_dqperchunk;
741 * Given the file system, inode OR id, and type (UDQUOT/GDQUOT), return a
742 * a locked dquot, doing an allocation (if requested) as needed.
743 * When both an inode and an id are given, the inode's id takes precedence.
744 * That is, if the id changes while we don't hold the ilock inside this
745 * function, the new dquot is returned, not necessarily the one requested
746 * in the id argument.
751 xfs_inode_t *ip, /* locked inode (optional) */
752 xfs_dqid_t id, /* uid/projid/gid depending on type */
753 uint type, /* XFS_DQ_USER/XFS_DQ_PROJ/XFS_DQ_GROUP */
754 uint flags, /* DQALLOC, DQSUSER, DQREPAIR, DOWARN */
755 xfs_dquot_t **O_dqpp) /* OUT : locked incore dquot */
757 struct xfs_quotainfo *qi = mp->m_quotainfo;
758 struct radix_tree_root *tree = xfs_dquot_tree(qi, type);
759 struct xfs_dquot *dqp;
763 ASSERT(XFS_IS_QUOTA_RUNNING(mp));
764 if ((! XFS_IS_UQUOTA_ON(mp) && type == XFS_DQ_USER) ||
765 (! XFS_IS_PQUOTA_ON(mp) && type == XFS_DQ_PROJ) ||
766 (! XFS_IS_GQUOTA_ON(mp) && type == XFS_DQ_GROUP)) {
771 if (xfs_do_dqerror) {
772 if ((xfs_dqerror_target == mp->m_ddev_targp) &&
773 (xfs_dqreq_num++ % xfs_dqerror_mod) == 0) {
774 xfs_debug(mp, "Returning error in dqget");
779 ASSERT(type == XFS_DQ_USER ||
780 type == XFS_DQ_PROJ ||
781 type == XFS_DQ_GROUP);
783 ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
784 ASSERT(xfs_inode_dquot(ip, type) == NULL);
788 /* Get the end of the quota file if we need it */
789 if (flags & XFS_QMOPT_DQNEXT) {
790 struct xfs_inode *quotip;
794 quotip = xfs_quota_inode(mp, type);
795 lock_mode = xfs_ilock_data_map_shared(quotip);
796 error = xfs_bmap_last_offset(quotip, &last, XFS_DATA_FORK);
797 xfs_iunlock(quotip, lock_mode);
800 eof = XFS_FSB_TO_B(mp, last);
804 mutex_lock(&qi->qi_tree_lock);
805 dqp = radix_tree_lookup(tree, id);
808 if (dqp->dq_flags & XFS_DQ_FREEING) {
810 mutex_unlock(&qi->qi_tree_lock);
811 trace_xfs_dqget_freeing(dqp);
816 /* uninit / unused quota found in radix tree, keep looking */
817 if (flags & XFS_QMOPT_DQNEXT) {
818 if (XFS_IS_DQUOT_UNINITIALIZED(dqp)) {
820 mutex_unlock(&qi->qi_tree_lock);
821 error = xfs_dq_get_next_id(mp, type, &id, eof);
829 mutex_unlock(&qi->qi_tree_lock);
831 trace_xfs_dqget_hit(dqp);
832 XFS_STATS_INC(mp, xs_qm_dqcachehits);
836 mutex_unlock(&qi->qi_tree_lock);
837 XFS_STATS_INC(mp, xs_qm_dqcachemisses);
840 * Dquot cache miss. We don't want to keep the inode lock across
841 * a (potential) disk read. Also we don't want to deal with the lock
842 * ordering between quotainode and this inode. OTOH, dropping the inode
843 * lock here means dealing with a chown that can happen before
844 * we re-acquire the lock.
847 xfs_iunlock(ip, XFS_ILOCK_EXCL);
849 error = xfs_qm_dqread(mp, id, type, flags, &dqp);
852 xfs_ilock(ip, XFS_ILOCK_EXCL);
854 /* If we are asked to find next active id, keep looking */
855 if (error == -ENOENT && (flags & XFS_QMOPT_DQNEXT)) {
856 error = xfs_dq_get_next_id(mp, type, &id, eof);
866 * A dquot could be attached to this inode by now, since
867 * we had dropped the ilock.
869 if (xfs_this_quota_on(mp, type)) {
870 struct xfs_dquot *dqp1;
872 dqp1 = xfs_inode_dquot(ip, type);
874 xfs_qm_dqdestroy(dqp);
880 /* inode stays locked on return */
881 xfs_qm_dqdestroy(dqp);
886 mutex_lock(&qi->qi_tree_lock);
887 error = radix_tree_insert(tree, id, dqp);
888 if (unlikely(error)) {
889 WARN_ON(error != -EEXIST);
892 * Duplicate found. Just throw away the new dquot and start
895 mutex_unlock(&qi->qi_tree_lock);
896 trace_xfs_dqget_dup(dqp);
897 xfs_qm_dqdestroy(dqp);
898 XFS_STATS_INC(mp, xs_qm_dquot_dups);
903 * We return a locked dquot to the caller, with a reference taken
909 mutex_unlock(&qi->qi_tree_lock);
911 /* If we are asked to find next active id, keep looking */
912 if (flags & XFS_QMOPT_DQNEXT) {
913 if (XFS_IS_DQUOT_UNINITIALIZED(dqp)) {
915 error = xfs_dq_get_next_id(mp, type, &id, eof);
923 ASSERT((ip == NULL) || xfs_isilocked(ip, XFS_ILOCK_EXCL));
924 trace_xfs_dqget_miss(dqp);
930 * Release a reference to the dquot (decrement ref-count) and unlock it.
932 * If there is a group quota attached to this dquot, carefully release that
933 * too without tripping over deadlocks'n'stuff.
937 struct xfs_dquot *dqp)
939 ASSERT(dqp->q_nrefs > 0);
940 ASSERT(XFS_DQ_IS_LOCKED(dqp));
942 trace_xfs_dqput(dqp);
944 if (--dqp->q_nrefs == 0) {
945 struct xfs_quotainfo *qi = dqp->q_mount->m_quotainfo;
946 trace_xfs_dqput_free(dqp);
948 if (list_lru_add(&qi->qi_lru, &dqp->q_lru))
949 XFS_STATS_INC(dqp->q_mount, xs_qm_dquot_unused);
955 * Release a dquot. Flush it if dirty, then dqput() it.
956 * dquot must not be locked.
965 trace_xfs_dqrele(dqp);
969 * We don't care to flush it if the dquot is dirty here.
970 * That will create stutters that we want to avoid.
971 * Instead we do a delayed write when we try to reclaim
972 * a dirty dquot. Also xfs_sync will take part of the burden...
978 * This is the dquot flushing I/O completion routine. It is called
979 * from interrupt level when the buffer containing the dquot is
980 * flushed to disk. It is responsible for removing the dquot logitem
981 * from the AIL if it has not been re-logged, and unlocking the dquot's
982 * flush lock. This behavior is very similar to that of inodes..
987 struct xfs_log_item *lip)
989 xfs_dq_logitem_t *qip = (struct xfs_dq_logitem *)lip;
990 xfs_dquot_t *dqp = qip->qli_dquot;
991 struct xfs_ail *ailp = lip->li_ailp;
994 * We only want to pull the item from the AIL if its
995 * location in the log has not changed since we started the flush.
996 * Thus, we only bother if the dquot's lsn has
997 * not changed. First we check the lsn outside the lock
998 * since it's cheaper, and then we recheck while
999 * holding the lock before removing the dquot from the AIL.
1001 if ((lip->li_flags & XFS_LI_IN_AIL) &&
1002 lip->li_lsn == qip->qli_flush_lsn) {
1004 /* xfs_trans_ail_delete() drops the AIL lock. */
1005 spin_lock(&ailp->xa_lock);
1006 if (lip->li_lsn == qip->qli_flush_lsn)
1007 xfs_trans_ail_delete(ailp, lip, SHUTDOWN_CORRUPT_INCORE);
1009 spin_unlock(&ailp->xa_lock);
1013 * Release the dq's flush lock since we're done with it.
1019 * Write a modified dquot to disk.
1020 * The dquot must be locked and the flush lock too taken by caller.
1021 * The flush lock will not be unlocked until the dquot reaches the disk,
1022 * but the dquot is free to be unlocked and modified by the caller
1023 * in the interim. Dquot is still locked on return. This behavior is
1024 * identical to that of inodes.
1028 struct xfs_dquot *dqp,
1029 struct xfs_buf **bpp)
1031 struct xfs_mount *mp = dqp->q_mount;
1033 struct xfs_disk_dquot *ddqp;
1036 ASSERT(XFS_DQ_IS_LOCKED(dqp));
1037 ASSERT(!completion_done(&dqp->q_flush));
1039 trace_xfs_dqflush(dqp);
1043 xfs_qm_dqunpin_wait(dqp);
1046 * This may have been unpinned because the filesystem is shutting
1047 * down forcibly. If that's the case we must not write this dquot
1048 * to disk, because the log record didn't make it to disk.
1050 * We also have to remove the log item from the AIL in this case,
1051 * as we wait for an emptry AIL as part of the unmount process.
1053 if (XFS_FORCED_SHUTDOWN(mp)) {
1054 struct xfs_log_item *lip = &dqp->q_logitem.qli_item;
1055 dqp->dq_flags &= ~XFS_DQ_DIRTY;
1057 xfs_trans_ail_remove(lip, SHUTDOWN_CORRUPT_INCORE);
1064 * Get the buffer containing the on-disk dquot
1066 error = xfs_trans_read_buf(mp, NULL, mp->m_ddev_targp, dqp->q_blkno,
1067 mp->m_quotainfo->qi_dqchunklen, 0, &bp,
1068 &xfs_dquot_buf_ops);
1073 * Calculate the location of the dquot inside the buffer.
1075 ddqp = bp->b_addr + dqp->q_bufoffset;
1078 * A simple sanity check in case we got a corrupted dquot..
1080 error = xfs_dqcheck(mp, &dqp->q_core, be32_to_cpu(ddqp->d_id), 0,
1081 XFS_QMOPT_DOWARN, "dqflush (incore copy)");
1085 xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE);
1089 /* This is the only portion of data that needs to persist */
1090 memcpy(ddqp, &dqp->q_core, sizeof(xfs_disk_dquot_t));
1093 * Clear the dirty field and remember the flush lsn for later use.
1095 dqp->dq_flags &= ~XFS_DQ_DIRTY;
1097 xfs_trans_ail_copy_lsn(mp->m_ail, &dqp->q_logitem.qli_flush_lsn,
1098 &dqp->q_logitem.qli_item.li_lsn);
1101 * copy the lsn into the on-disk dquot now while we have the in memory
1102 * dquot here. This can't be done later in the write verifier as we
1103 * can't get access to the log item at that point in time.
1105 * We also calculate the CRC here so that the on-disk dquot in the
1106 * buffer always has a valid CRC. This ensures there is no possibility
1107 * of a dquot without an up-to-date CRC getting to disk.
1109 if (xfs_sb_version_hascrc(&mp->m_sb)) {
1110 struct xfs_dqblk *dqb = (struct xfs_dqblk *)ddqp;
1112 dqb->dd_lsn = cpu_to_be64(dqp->q_logitem.qli_item.li_lsn);
1113 xfs_update_cksum((char *)dqb, sizeof(struct xfs_dqblk),
1118 * Attach an iodone routine so that we can remove this dquot from the
1119 * AIL and release the flush lock once the dquot is synced to disk.
1121 xfs_buf_attach_iodone(bp, xfs_qm_dqflush_done,
1122 &dqp->q_logitem.qli_item);
1125 * If the buffer is pinned then push on the log so we won't
1126 * get stuck waiting in the write for too long.
1128 if (xfs_buf_ispinned(bp)) {
1129 trace_xfs_dqflush_force(dqp);
1130 xfs_log_force(mp, 0);
1133 trace_xfs_dqflush_done(dqp);
1143 * Lock two xfs_dquot structures.
1145 * To avoid deadlocks we always lock the quota structure with
1146 * the lowerd id first.
1155 if (be32_to_cpu(d1->q_core.d_id) >
1156 be32_to_cpu(d2->q_core.d_id)) {
1157 mutex_lock(&d2->q_qlock);
1158 mutex_lock_nested(&d1->q_qlock, XFS_QLOCK_NESTED);
1160 mutex_lock(&d1->q_qlock);
1161 mutex_lock_nested(&d2->q_qlock, XFS_QLOCK_NESTED);
1164 mutex_lock(&d1->q_qlock);
1166 mutex_lock(&d2->q_qlock);
1174 kmem_zone_init(sizeof(struct xfs_dquot), "xfs_dquot");
1179 kmem_zone_init(sizeof(struct xfs_dquot_acct), "xfs_dqtrx");
1180 if (!xfs_qm_dqtrxzone)
1181 goto out_free_dqzone;
1186 kmem_zone_destroy(xfs_qm_dqzone);
1194 kmem_zone_destroy(xfs_qm_dqtrxzone);
1195 kmem_zone_destroy(xfs_qm_dqzone);