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_cksum.h"
40 #include "xfs_trace.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_other_class
;
68 * This is called to free all the memory associated with a dquot
74 ASSERT(list_empty(&dqp
->q_lru
));
76 mutex_destroy(&dqp
->q_qlock
);
77 kmem_zone_free(xfs_qm_dqzone
, dqp
);
79 XFS_STATS_DEC(xs_qm_dquot
);
83 * If default limits are in force, push them into the dquot now.
84 * We overwrite the dquot limits only if they are zero and this
85 * is not the root dquot.
88 xfs_qm_adjust_dqlimits(
92 struct xfs_quotainfo
*q
= mp
->m_quotainfo
;
93 struct xfs_disk_dquot
*d
= &dq
->q_core
;
98 if (q
->qi_bsoftlimit
&& !d
->d_blk_softlimit
) {
99 d
->d_blk_softlimit
= cpu_to_be64(q
->qi_bsoftlimit
);
102 if (q
->qi_bhardlimit
&& !d
->d_blk_hardlimit
) {
103 d
->d_blk_hardlimit
= cpu_to_be64(q
->qi_bhardlimit
);
106 if (q
->qi_isoftlimit
&& !d
->d_ino_softlimit
)
107 d
->d_ino_softlimit
= cpu_to_be64(q
->qi_isoftlimit
);
108 if (q
->qi_ihardlimit
&& !d
->d_ino_hardlimit
)
109 d
->d_ino_hardlimit
= cpu_to_be64(q
->qi_ihardlimit
);
110 if (q
->qi_rtbsoftlimit
&& !d
->d_rtb_softlimit
)
111 d
->d_rtb_softlimit
= cpu_to_be64(q
->qi_rtbsoftlimit
);
112 if (q
->qi_rtbhardlimit
&& !d
->d_rtb_hardlimit
)
113 d
->d_rtb_hardlimit
= cpu_to_be64(q
->qi_rtbhardlimit
);
116 xfs_dquot_set_prealloc_limits(dq
);
120 * Check the limits and timers of a dquot and start or reset timers
122 * This gets called even when quota enforcement is OFF, which makes our
123 * life a little less complicated. (We just don't reject any quota
124 * reservations in that case, when enforcement is off).
125 * We also return 0 as the values of the timers in Q_GETQUOTA calls, when
127 * In contrast, warnings are a little different in that they don't
128 * 'automatically' get started when limits get exceeded. They do
129 * get reset to zero, however, when we find the count to be under
130 * the soft limit (they are only ever set non-zero via userspace).
133 xfs_qm_adjust_dqtimers(
140 if (d
->d_blk_hardlimit
)
141 ASSERT(be64_to_cpu(d
->d_blk_softlimit
) <=
142 be64_to_cpu(d
->d_blk_hardlimit
));
143 if (d
->d_ino_hardlimit
)
144 ASSERT(be64_to_cpu(d
->d_ino_softlimit
) <=
145 be64_to_cpu(d
->d_ino_hardlimit
));
146 if (d
->d_rtb_hardlimit
)
147 ASSERT(be64_to_cpu(d
->d_rtb_softlimit
) <=
148 be64_to_cpu(d
->d_rtb_hardlimit
));
152 if ((d
->d_blk_softlimit
&&
153 (be64_to_cpu(d
->d_bcount
) >
154 be64_to_cpu(d
->d_blk_softlimit
))) ||
155 (d
->d_blk_hardlimit
&&
156 (be64_to_cpu(d
->d_bcount
) >
157 be64_to_cpu(d
->d_blk_hardlimit
)))) {
158 d
->d_btimer
= cpu_to_be32(get_seconds() +
159 mp
->m_quotainfo
->qi_btimelimit
);
164 if ((!d
->d_blk_softlimit
||
165 (be64_to_cpu(d
->d_bcount
) <=
166 be64_to_cpu(d
->d_blk_softlimit
))) &&
167 (!d
->d_blk_hardlimit
||
168 (be64_to_cpu(d
->d_bcount
) <=
169 be64_to_cpu(d
->d_blk_hardlimit
)))) {
175 if ((d
->d_ino_softlimit
&&
176 (be64_to_cpu(d
->d_icount
) >
177 be64_to_cpu(d
->d_ino_softlimit
))) ||
178 (d
->d_ino_hardlimit
&&
179 (be64_to_cpu(d
->d_icount
) >
180 be64_to_cpu(d
->d_ino_hardlimit
)))) {
181 d
->d_itimer
= cpu_to_be32(get_seconds() +
182 mp
->m_quotainfo
->qi_itimelimit
);
187 if ((!d
->d_ino_softlimit
||
188 (be64_to_cpu(d
->d_icount
) <=
189 be64_to_cpu(d
->d_ino_softlimit
))) &&
190 (!d
->d_ino_hardlimit
||
191 (be64_to_cpu(d
->d_icount
) <=
192 be64_to_cpu(d
->d_ino_hardlimit
)))) {
197 if (!d
->d_rtbtimer
) {
198 if ((d
->d_rtb_softlimit
&&
199 (be64_to_cpu(d
->d_rtbcount
) >
200 be64_to_cpu(d
->d_rtb_softlimit
))) ||
201 (d
->d_rtb_hardlimit
&&
202 (be64_to_cpu(d
->d_rtbcount
) >
203 be64_to_cpu(d
->d_rtb_hardlimit
)))) {
204 d
->d_rtbtimer
= cpu_to_be32(get_seconds() +
205 mp
->m_quotainfo
->qi_rtbtimelimit
);
210 if ((!d
->d_rtb_softlimit
||
211 (be64_to_cpu(d
->d_rtbcount
) <=
212 be64_to_cpu(d
->d_rtb_softlimit
))) &&
213 (!d
->d_rtb_hardlimit
||
214 (be64_to_cpu(d
->d_rtbcount
) <=
215 be64_to_cpu(d
->d_rtb_hardlimit
)))) {
222 * initialize a buffer full of dquots and log the whole thing
225 xfs_qm_init_dquot_blk(
232 struct xfs_quotainfo
*q
= mp
->m_quotainfo
;
237 ASSERT(xfs_buf_islocked(bp
));
242 * ID of the first dquot in the block - id's are zero based.
244 curid
= id
- (id
% q
->qi_dqperchunk
);
246 memset(d
, 0, BBTOB(q
->qi_dqchunklen
));
247 for (i
= 0; i
< q
->qi_dqperchunk
; i
++, d
++, curid
++) {
248 d
->dd_diskdq
.d_magic
= cpu_to_be16(XFS_DQUOT_MAGIC
);
249 d
->dd_diskdq
.d_version
= XFS_DQUOT_VERSION
;
250 d
->dd_diskdq
.d_id
= cpu_to_be32(curid
);
251 d
->dd_diskdq
.d_flags
= type
;
252 if (xfs_sb_version_hascrc(&mp
->m_sb
))
253 uuid_copy(&d
->dd_uuid
, &mp
->m_sb
.sb_uuid
);
256 xfs_trans_dquot_buf(tp
, bp
,
257 (type
& XFS_DQ_USER
? XFS_BLF_UDQUOT_BUF
:
258 ((type
& XFS_DQ_PROJ
) ? XFS_BLF_PDQUOT_BUF
:
259 XFS_BLF_GDQUOT_BUF
)));
260 xfs_trans_log_buf(tp
, bp
, 0, BBTOB(q
->qi_dqchunklen
) - 1);
264 * Initialize the dynamic speculative preallocation thresholds. The lo/hi
265 * watermarks correspond to the soft and hard limits by default. If a soft limit
266 * is not specified, we use 95% of the hard limit.
269 xfs_dquot_set_prealloc_limits(struct xfs_dquot
*dqp
)
273 dqp
->q_prealloc_hi_wmark
= be64_to_cpu(dqp
->q_core
.d_blk_hardlimit
);
274 dqp
->q_prealloc_lo_wmark
= be64_to_cpu(dqp
->q_core
.d_blk_softlimit
);
275 if (!dqp
->q_prealloc_lo_wmark
) {
276 dqp
->q_prealloc_lo_wmark
= dqp
->q_prealloc_hi_wmark
;
277 do_div(dqp
->q_prealloc_lo_wmark
, 100);
278 dqp
->q_prealloc_lo_wmark
*= 95;
281 space
= dqp
->q_prealloc_hi_wmark
;
284 dqp
->q_low_space
[XFS_QLOWSP_1_PCNT
] = space
;
285 dqp
->q_low_space
[XFS_QLOWSP_3_PCNT
] = space
* 3;
286 dqp
->q_low_space
[XFS_QLOWSP_5_PCNT
] = space
* 5;
290 xfs_dquot_buf_calc_crc(
291 struct xfs_mount
*mp
,
294 struct xfs_dqblk
*d
= (struct xfs_dqblk
*)bp
->b_addr
;
297 if (!xfs_sb_version_hascrc(&mp
->m_sb
))
300 for (i
= 0; i
< mp
->m_quotainfo
->qi_dqperchunk
; i
++, d
++) {
301 xfs_update_cksum((char *)d
, sizeof(struct xfs_dqblk
),
302 offsetof(struct xfs_dqblk
, dd_crc
));
307 xfs_dquot_buf_verify_crc(
308 struct xfs_mount
*mp
,
311 struct xfs_dqblk
*d
= (struct xfs_dqblk
*)bp
->b_addr
;
315 if (!xfs_sb_version_hascrc(&mp
->m_sb
))
319 * if we are in log recovery, the quota subsystem has not been
320 * initialised so we have no quotainfo structure. In that case, we need
321 * to manually calculate the number of dquots in the buffer.
324 ndquots
= mp
->m_quotainfo
->qi_dqperchunk
;
326 ndquots
= xfs_qm_calc_dquots_per_chunk(mp
,
327 XFS_BB_TO_FSB(mp
, bp
->b_length
));
329 for (i
= 0; i
< ndquots
; i
++, d
++) {
330 if (!xfs_verify_cksum((char *)d
, sizeof(struct xfs_dqblk
),
331 offsetof(struct xfs_dqblk
, dd_crc
)))
333 if (!uuid_equal(&d
->dd_uuid
, &mp
->m_sb
.sb_uuid
))
341 xfs_dquot_buf_verify(
342 struct xfs_mount
*mp
,
345 struct xfs_dqblk
*d
= (struct xfs_dqblk
*)bp
->b_addr
;
351 * if we are in log recovery, the quota subsystem has not been
352 * initialised so we have no quotainfo structure. In that case, we need
353 * to manually calculate the number of dquots in the buffer.
356 ndquots
= mp
->m_quotainfo
->qi_dqperchunk
;
358 ndquots
= xfs_qm_calc_dquots_per_chunk(mp
, bp
->b_length
);
361 * On the first read of the buffer, verify that each dquot is valid.
362 * We don't know what the id of the dquot is supposed to be, just that
363 * they should be increasing monotonically within the buffer. If the
364 * first id is corrupt, then it will fail on the second dquot in the
365 * buffer so corruptions could point to the wrong dquot in this case.
367 for (i
= 0; i
< ndquots
; i
++) {
368 struct xfs_disk_dquot
*ddq
;
371 ddq
= &d
[i
].dd_diskdq
;
374 id
= be32_to_cpu(ddq
->d_id
);
376 error
= xfs_qm_dqcheck(mp
, ddq
, id
+ i
, 0, XFS_QMOPT_DOWARN
,
377 "xfs_dquot_buf_verify");
385 xfs_dquot_buf_read_verify(
388 struct xfs_mount
*mp
= bp
->b_target
->bt_mount
;
390 if (!xfs_dquot_buf_verify_crc(mp
, bp
) || !xfs_dquot_buf_verify(mp
, bp
)) {
391 XFS_CORRUPTION_ERROR(__func__
, XFS_ERRLEVEL_LOW
, mp
, bp
->b_addr
);
392 xfs_buf_ioerror(bp
, EFSCORRUPTED
);
397 xfs_dquot_buf_write_verify(
400 struct xfs_mount
*mp
= bp
->b_target
->bt_mount
;
402 if (!xfs_dquot_buf_verify(mp
, bp
)) {
403 XFS_CORRUPTION_ERROR(__func__
, XFS_ERRLEVEL_LOW
, mp
, bp
->b_addr
);
404 xfs_buf_ioerror(bp
, EFSCORRUPTED
);
407 xfs_dquot_buf_calc_crc(mp
, bp
);
410 const struct xfs_buf_ops xfs_dquot_buf_ops
= {
411 .verify_read
= xfs_dquot_buf_read_verify
,
412 .verify_write
= xfs_dquot_buf_write_verify
,
416 * Allocate a block and fill it with dquots.
417 * This is called when the bmapi finds a hole.
425 xfs_fileoff_t offset_fsb
,
428 xfs_fsblock_t firstblock
;
429 xfs_bmap_free_t flist
;
431 int nmaps
, error
, committed
;
433 xfs_trans_t
*tp
= *tpp
;
437 trace_xfs_dqalloc(dqp
);
440 * Initialize the bmap freelist prior to calling bmapi code.
442 xfs_bmap_init(&flist
, &firstblock
);
443 xfs_ilock(quotip
, XFS_ILOCK_EXCL
);
445 * Return if this type of quotas is turned off while we didn't
448 if (!xfs_this_quota_on(dqp
->q_mount
, dqp
->dq_flags
)) {
449 xfs_iunlock(quotip
, XFS_ILOCK_EXCL
);
453 xfs_trans_ijoin(tp
, quotip
, XFS_ILOCK_EXCL
);
455 error
= xfs_bmapi_write(tp
, quotip
, offset_fsb
,
456 XFS_DQUOT_CLUSTER_SIZE_FSB
, XFS_BMAPI_METADATA
,
457 &firstblock
, XFS_QM_DQALLOC_SPACE_RES(mp
),
458 &map
, &nmaps
, &flist
);
461 ASSERT(map
.br_blockcount
== XFS_DQUOT_CLUSTER_SIZE_FSB
);
463 ASSERT((map
.br_startblock
!= DELAYSTARTBLOCK
) &&
464 (map
.br_startblock
!= HOLESTARTBLOCK
));
467 * Keep track of the blkno to save a lookup later
469 dqp
->q_blkno
= XFS_FSB_TO_DADDR(mp
, map
.br_startblock
);
471 /* now we can just get the buffer (there's nothing to read yet) */
472 bp
= xfs_trans_get_buf(tp
, mp
->m_ddev_targp
,
474 mp
->m_quotainfo
->qi_dqchunklen
,
477 error
= xfs_buf_geterror(bp
);
480 bp
->b_ops
= &xfs_dquot_buf_ops
;
483 * Make a chunk of dquots out of this buffer and log
486 xfs_qm_init_dquot_blk(tp
, mp
, be32_to_cpu(dqp
->q_core
.d_id
),
487 dqp
->dq_flags
& XFS_DQ_ALLTYPES
, bp
);
490 * xfs_bmap_finish() may commit the current transaction and
491 * start a second transaction if the freelist is not empty.
493 * Since we still want to modify this buffer, we need to
494 * ensure that the buffer is not released on commit of
495 * the first transaction and ensure the buffer is added to the
496 * second transaction.
498 * If there is only one transaction then don't stop the buffer
499 * from being released when it commits later on.
502 xfs_trans_bhold(tp
, bp
);
504 if ((error
= xfs_bmap_finish(tpp
, &flist
, &committed
))) {
510 xfs_trans_bjoin(tp
, bp
);
512 xfs_trans_bhold_release(tp
, bp
);
519 xfs_bmap_cancel(&flist
);
521 xfs_iunlock(quotip
, XFS_ILOCK_EXCL
);
527 struct xfs_mount
*mp
,
528 struct xfs_trans
*tp
,
529 struct xfs_dquot
*dqp
,
531 struct xfs_buf
**bpp
)
534 struct xfs_disk_dquot
*ddq
;
539 * Read the buffer without verification so we get the corrupted
540 * buffer returned to us. make sure we verify it on write, though.
542 error
= xfs_trans_read_buf(mp
, tp
, mp
->m_ddev_targp
, dqp
->q_blkno
,
543 mp
->m_quotainfo
->qi_dqchunklen
,
547 ASSERT(*bpp
== NULL
);
548 return XFS_ERROR(error
);
550 (*bpp
)->b_ops
= &xfs_dquot_buf_ops
;
552 ASSERT(xfs_buf_islocked(*bpp
));
553 d
= (struct xfs_dqblk
*)(*bpp
)->b_addr
;
555 /* Do the actual repair of dquots in this buffer */
556 for (i
= 0; i
< mp
->m_quotainfo
->qi_dqperchunk
; i
++) {
557 ddq
= &d
[i
].dd_diskdq
;
558 error
= xfs_qm_dqcheck(mp
, ddq
, firstid
+ i
,
559 dqp
->dq_flags
& XFS_DQ_ALLTYPES
,
560 XFS_QMOPT_DQREPAIR
, "xfs_qm_dqrepair");
562 /* repair failed, we're screwed */
563 xfs_trans_brelse(tp
, *bpp
);
564 return XFS_ERROR(EIO
);
572 * Maps a dquot to the buffer containing its on-disk version.
573 * This returns a ptr to the buffer containing the on-disk dquot
574 * in the bpp param, and a ptr to the on-disk dquot within that buffer
580 xfs_disk_dquot_t
**O_ddpp
,
585 int nmaps
= 1, error
;
587 xfs_inode_t
*quotip
= XFS_DQ_TO_QIP(dqp
);
588 xfs_mount_t
*mp
= dqp
->q_mount
;
589 xfs_dqid_t id
= be32_to_cpu(dqp
->q_core
.d_id
);
590 xfs_trans_t
*tp
= (tpp
? *tpp
: NULL
);
592 dqp
->q_fileoffset
= (xfs_fileoff_t
)id
/ mp
->m_quotainfo
->qi_dqperchunk
;
594 xfs_ilock(quotip
, XFS_ILOCK_SHARED
);
595 if (!xfs_this_quota_on(dqp
->q_mount
, dqp
->dq_flags
)) {
597 * Return if this type of quotas is turned off while we
598 * didn't have the quota inode lock.
600 xfs_iunlock(quotip
, XFS_ILOCK_SHARED
);
605 * Find the block map; no allocations yet
607 error
= xfs_bmapi_read(quotip
, dqp
->q_fileoffset
,
608 XFS_DQUOT_CLUSTER_SIZE_FSB
, &map
, &nmaps
, 0);
610 xfs_iunlock(quotip
, XFS_ILOCK_SHARED
);
615 ASSERT(map
.br_blockcount
== 1);
618 * Offset of dquot in the (fixed sized) dquot chunk.
620 dqp
->q_bufoffset
= (id
% mp
->m_quotainfo
->qi_dqperchunk
) *
623 ASSERT(map
.br_startblock
!= DELAYSTARTBLOCK
);
624 if (map
.br_startblock
== HOLESTARTBLOCK
) {
626 * We don't allocate unless we're asked to
628 if (!(flags
& XFS_QMOPT_DQALLOC
))
632 error
= xfs_qm_dqalloc(tpp
, mp
, dqp
, quotip
,
633 dqp
->q_fileoffset
, &bp
);
638 trace_xfs_dqtobp_read(dqp
);
641 * store the blkno etc so that we don't have to do the
642 * mapping all the time
644 dqp
->q_blkno
= XFS_FSB_TO_DADDR(mp
, map
.br_startblock
);
646 error
= xfs_trans_read_buf(mp
, tp
, mp
->m_ddev_targp
,
648 mp
->m_quotainfo
->qi_dqchunklen
,
649 0, &bp
, &xfs_dquot_buf_ops
);
651 if (error
== EFSCORRUPTED
&& (flags
& XFS_QMOPT_DQREPAIR
)) {
652 xfs_dqid_t firstid
= (xfs_dqid_t
)map
.br_startoff
*
653 mp
->m_quotainfo
->qi_dqperchunk
;
655 error
= xfs_qm_dqrepair(mp
, tp
, dqp
, firstid
, &bp
);
660 return XFS_ERROR(error
);
664 ASSERT(xfs_buf_islocked(bp
));
666 *O_ddpp
= bp
->b_addr
+ dqp
->q_bufoffset
;
673 * Read in the ondisk dquot using dqtobp() then copy it to an incore version,
674 * and release the buffer immediately.
676 * If XFS_QMOPT_DQALLOC is set, allocate a dquot on disk if it needed.
680 struct xfs_mount
*mp
,
684 struct xfs_dquot
**O_dqpp
)
686 struct xfs_dquot
*dqp
;
687 struct xfs_disk_dquot
*ddqp
;
689 struct xfs_trans
*tp
= NULL
;
694 dqp
= kmem_zone_zalloc(xfs_qm_dqzone
, KM_SLEEP
);
696 dqp
->dq_flags
= type
;
697 dqp
->q_core
.d_id
= cpu_to_be32(id
);
699 INIT_LIST_HEAD(&dqp
->q_lru
);
700 mutex_init(&dqp
->q_qlock
);
701 init_waitqueue_head(&dqp
->q_pinwait
);
704 * Because we want to use a counting completion, complete
705 * the flush completion once to allow a single access to
706 * the flush completion without blocking.
708 init_completion(&dqp
->q_flush
);
709 complete(&dqp
->q_flush
);
712 * Make sure group quotas have a different lock class than user
715 if (!(type
& XFS_DQ_USER
))
716 lockdep_set_class(&dqp
->q_qlock
, &xfs_dquot_other_class
);
718 XFS_STATS_INC(xs_qm_dquot
);
720 trace_xfs_dqread(dqp
);
722 if (flags
& XFS_QMOPT_DQALLOC
) {
723 tp
= xfs_trans_alloc(mp
, XFS_TRANS_QM_DQALLOC
);
724 error
= xfs_trans_reserve(tp
, XFS_QM_DQALLOC_SPACE_RES(mp
),
725 XFS_QM_DQALLOC_LOG_RES(mp
), 0,
726 XFS_TRANS_PERM_LOG_RES
,
727 XFS_WRITE_LOG_COUNT
);
730 cancelflags
= XFS_TRANS_RELEASE_LOG_RES
;
734 * get a pointer to the on-disk dquot and the buffer containing it
735 * dqp already knows its own type (GROUP/USER).
737 error
= xfs_qm_dqtobp(&tp
, dqp
, &ddqp
, &bp
, flags
);
740 * This can happen if quotas got turned off (ESRCH),
741 * or if the dquot didn't exist on disk and we ask to
744 trace_xfs_dqread_fail(dqp
);
745 cancelflags
|= XFS_TRANS_ABORT
;
749 /* copy everything from disk dquot to the incore dquot */
750 memcpy(&dqp
->q_core
, ddqp
, sizeof(xfs_disk_dquot_t
));
751 xfs_qm_dquot_logitem_init(dqp
);
754 * Reservation counters are defined as reservation plus current usage
755 * to avoid having to add every time.
757 dqp
->q_res_bcount
= be64_to_cpu(ddqp
->d_bcount
);
758 dqp
->q_res_icount
= be64_to_cpu(ddqp
->d_icount
);
759 dqp
->q_res_rtbcount
= be64_to_cpu(ddqp
->d_rtbcount
);
761 /* initialize the dquot speculative prealloc thresholds */
762 xfs_dquot_set_prealloc_limits(dqp
);
764 /* Mark the buf so that this will stay incore a little longer */
765 xfs_buf_set_ref(bp
, XFS_DQUOT_REF
);
768 * We got the buffer with a xfs_trans_read_buf() (in dqtobp())
769 * So we need to release with xfs_trans_brelse().
770 * The strategy here is identical to that of inodes; we lock
771 * the dquot in xfs_qm_dqget() before making it accessible to
772 * others. This is because dquots, like inodes, need a good level of
773 * concurrency, and we don't want to take locks on the entire buffers
774 * for dquot accesses.
775 * Note also that the dquot buffer may even be dirty at this point, if
776 * this particular dquot was repaired. We still aren't afraid to
777 * brelse it because we have the changes incore.
779 ASSERT(xfs_buf_islocked(bp
));
780 xfs_trans_brelse(tp
, bp
);
783 error
= xfs_trans_commit(tp
, XFS_TRANS_RELEASE_LOG_RES
);
793 xfs_trans_cancel(tp
, cancelflags
);
795 xfs_qm_dqdestroy(dqp
);
801 * Given the file system, inode OR id, and type (UDQUOT/GDQUOT), return a
802 * a locked dquot, doing an allocation (if requested) as needed.
803 * When both an inode and an id are given, the inode's id takes precedence.
804 * That is, if the id changes while we don't hold the ilock inside this
805 * function, the new dquot is returned, not necessarily the one requested
806 * in the id argument.
811 xfs_inode_t
*ip
, /* locked inode (optional) */
812 xfs_dqid_t id
, /* uid/projid/gid depending on type */
813 uint type
, /* XFS_DQ_USER/XFS_DQ_PROJ/XFS_DQ_GROUP */
814 uint flags
, /* DQALLOC, DQSUSER, DQREPAIR, DOWARN */
815 xfs_dquot_t
**O_dqpp
) /* OUT : locked incore dquot */
817 struct xfs_quotainfo
*qi
= mp
->m_quotainfo
;
818 struct radix_tree_root
*tree
= XFS_DQUOT_TREE(qi
, type
);
819 struct xfs_dquot
*dqp
;
822 ASSERT(XFS_IS_QUOTA_RUNNING(mp
));
823 if ((! XFS_IS_UQUOTA_ON(mp
) && type
== XFS_DQ_USER
) ||
824 (! XFS_IS_PQUOTA_ON(mp
) && type
== XFS_DQ_PROJ
) ||
825 (! XFS_IS_GQUOTA_ON(mp
) && type
== XFS_DQ_GROUP
)) {
830 if (xfs_do_dqerror
) {
831 if ((xfs_dqerror_target
== mp
->m_ddev_targp
) &&
832 (xfs_dqreq_num
++ % xfs_dqerror_mod
) == 0) {
833 xfs_debug(mp
, "Returning error in dqget");
838 ASSERT(type
== XFS_DQ_USER
||
839 type
== XFS_DQ_PROJ
||
840 type
== XFS_DQ_GROUP
);
842 ASSERT(xfs_isilocked(ip
, XFS_ILOCK_EXCL
));
843 ASSERT(xfs_inode_dquot(ip
, type
) == NULL
);
848 mutex_lock(&qi
->qi_tree_lock
);
849 dqp
= radix_tree_lookup(tree
, id
);
852 if (dqp
->dq_flags
& XFS_DQ_FREEING
) {
854 mutex_unlock(&qi
->qi_tree_lock
);
855 trace_xfs_dqget_freeing(dqp
);
861 mutex_unlock(&qi
->qi_tree_lock
);
863 trace_xfs_dqget_hit(dqp
);
864 XFS_STATS_INC(xs_qm_dqcachehits
);
868 mutex_unlock(&qi
->qi_tree_lock
);
869 XFS_STATS_INC(xs_qm_dqcachemisses
);
872 * Dquot cache miss. We don't want to keep the inode lock across
873 * a (potential) disk read. Also we don't want to deal with the lock
874 * ordering between quotainode and this inode. OTOH, dropping the inode
875 * lock here means dealing with a chown that can happen before
876 * we re-acquire the lock.
879 xfs_iunlock(ip
, XFS_ILOCK_EXCL
);
881 error
= xfs_qm_dqread(mp
, id
, type
, flags
, &dqp
);
884 xfs_ilock(ip
, XFS_ILOCK_EXCL
);
891 * A dquot could be attached to this inode by now, since
892 * we had dropped the ilock.
894 if (xfs_this_quota_on(mp
, type
)) {
895 struct xfs_dquot
*dqp1
;
897 dqp1
= xfs_inode_dquot(ip
, type
);
899 xfs_qm_dqdestroy(dqp
);
905 /* inode stays locked on return */
906 xfs_qm_dqdestroy(dqp
);
907 return XFS_ERROR(ESRCH
);
911 mutex_lock(&qi
->qi_tree_lock
);
912 error
= -radix_tree_insert(tree
, id
, dqp
);
913 if (unlikely(error
)) {
914 WARN_ON(error
!= EEXIST
);
917 * Duplicate found. Just throw away the new dquot and start
920 mutex_unlock(&qi
->qi_tree_lock
);
921 trace_xfs_dqget_dup(dqp
);
922 xfs_qm_dqdestroy(dqp
);
923 XFS_STATS_INC(xs_qm_dquot_dups
);
928 * We return a locked dquot to the caller, with a reference taken
934 mutex_unlock(&qi
->qi_tree_lock
);
937 ASSERT((ip
== NULL
) || xfs_isilocked(ip
, XFS_ILOCK_EXCL
));
938 trace_xfs_dqget_miss(dqp
);
946 struct xfs_dquot
*dqp
)
948 struct xfs_quotainfo
*qi
= dqp
->q_mount
->m_quotainfo
;
949 struct xfs_dquot
*gdqp
;
951 trace_xfs_dqput_free(dqp
);
953 mutex_lock(&qi
->qi_lru_lock
);
954 if (list_empty(&dqp
->q_lru
)) {
955 list_add_tail(&dqp
->q_lru
, &qi
->qi_lru_list
);
957 XFS_STATS_INC(xs_qm_dquot_unused
);
959 mutex_unlock(&qi
->qi_lru_lock
);
962 * If we just added a udquot to the freelist, then we want to release
963 * the gdquot reference that it (probably) has. Otherwise it'll keep
964 * the gdquot from getting reclaimed.
966 gdqp
= dqp
->q_gdquot
;
969 dqp
->q_gdquot
= NULL
;
974 * If we had a group quota hint, release it now.
981 * Release a reference to the dquot (decrement ref-count) and unlock it.
983 * If there is a group quota attached to this dquot, carefully release that
984 * too without tripping over deadlocks'n'stuff.
988 struct xfs_dquot
*dqp
)
990 ASSERT(dqp
->q_nrefs
> 0);
991 ASSERT(XFS_DQ_IS_LOCKED(dqp
));
993 trace_xfs_dqput(dqp
);
995 if (--dqp
->q_nrefs
> 0)
998 xfs_qm_dqput_final(dqp
);
1002 * Release a dquot. Flush it if dirty, then dqput() it.
1003 * dquot must not be locked.
1012 trace_xfs_dqrele(dqp
);
1016 * We don't care to flush it if the dquot is dirty here.
1017 * That will create stutters that we want to avoid.
1018 * Instead we do a delayed write when we try to reclaim
1019 * a dirty dquot. Also xfs_sync will take part of the burden...
1025 * This is the dquot flushing I/O completion routine. It is called
1026 * from interrupt level when the buffer containing the dquot is
1027 * flushed to disk. It is responsible for removing the dquot logitem
1028 * from the AIL if it has not been re-logged, and unlocking the dquot's
1029 * flush lock. This behavior is very similar to that of inodes..
1032 xfs_qm_dqflush_done(
1034 struct xfs_log_item
*lip
)
1036 xfs_dq_logitem_t
*qip
= (struct xfs_dq_logitem
*)lip
;
1037 xfs_dquot_t
*dqp
= qip
->qli_dquot
;
1038 struct xfs_ail
*ailp
= lip
->li_ailp
;
1041 * We only want to pull the item from the AIL if its
1042 * location in the log has not changed since we started the flush.
1043 * Thus, we only bother if the dquot's lsn has
1044 * not changed. First we check the lsn outside the lock
1045 * since it's cheaper, and then we recheck while
1046 * holding the lock before removing the dquot from the AIL.
1048 if ((lip
->li_flags
& XFS_LI_IN_AIL
) &&
1049 lip
->li_lsn
== qip
->qli_flush_lsn
) {
1051 /* xfs_trans_ail_delete() drops the AIL lock. */
1052 spin_lock(&ailp
->xa_lock
);
1053 if (lip
->li_lsn
== qip
->qli_flush_lsn
)
1054 xfs_trans_ail_delete(ailp
, lip
, SHUTDOWN_CORRUPT_INCORE
);
1056 spin_unlock(&ailp
->xa_lock
);
1060 * Release the dq's flush lock since we're done with it.
1066 * Write a modified dquot to disk.
1067 * The dquot must be locked and the flush lock too taken by caller.
1068 * The flush lock will not be unlocked until the dquot reaches the disk,
1069 * but the dquot is free to be unlocked and modified by the caller
1070 * in the interim. Dquot is still locked on return. This behavior is
1071 * identical to that of inodes.
1075 struct xfs_dquot
*dqp
,
1076 struct xfs_buf
**bpp
)
1078 struct xfs_mount
*mp
= dqp
->q_mount
;
1080 struct xfs_disk_dquot
*ddqp
;
1083 ASSERT(XFS_DQ_IS_LOCKED(dqp
));
1084 ASSERT(!completion_done(&dqp
->q_flush
));
1086 trace_xfs_dqflush(dqp
);
1090 xfs_qm_dqunpin_wait(dqp
);
1093 * This may have been unpinned because the filesystem is shutting
1094 * down forcibly. If that's the case we must not write this dquot
1095 * to disk, because the log record didn't make it to disk.
1097 * We also have to remove the log item from the AIL in this case,
1098 * as we wait for an emptry AIL as part of the unmount process.
1100 if (XFS_FORCED_SHUTDOWN(mp
)) {
1101 struct xfs_log_item
*lip
= &dqp
->q_logitem
.qli_item
;
1102 dqp
->dq_flags
&= ~XFS_DQ_DIRTY
;
1104 spin_lock(&mp
->m_ail
->xa_lock
);
1105 if (lip
->li_flags
& XFS_LI_IN_AIL
)
1106 xfs_trans_ail_delete(mp
->m_ail
, lip
,
1107 SHUTDOWN_CORRUPT_INCORE
);
1109 spin_unlock(&mp
->m_ail
->xa_lock
);
1110 error
= XFS_ERROR(EIO
);
1115 * Get the buffer containing the on-disk dquot
1117 error
= xfs_trans_read_buf(mp
, NULL
, mp
->m_ddev_targp
, dqp
->q_blkno
,
1118 mp
->m_quotainfo
->qi_dqchunklen
, 0, &bp
, NULL
);
1123 * Calculate the location of the dquot inside the buffer.
1125 ddqp
= bp
->b_addr
+ dqp
->q_bufoffset
;
1128 * A simple sanity check in case we got a corrupted dquot..
1130 error
= xfs_qm_dqcheck(mp
, &dqp
->q_core
, be32_to_cpu(ddqp
->d_id
), 0,
1131 XFS_QMOPT_DOWARN
, "dqflush (incore copy)");
1135 xfs_force_shutdown(mp
, SHUTDOWN_CORRUPT_INCORE
);
1136 return XFS_ERROR(EIO
);
1139 /* This is the only portion of data that needs to persist */
1140 memcpy(ddqp
, &dqp
->q_core
, sizeof(xfs_disk_dquot_t
));
1143 * Clear the dirty field and remember the flush lsn for later use.
1145 dqp
->dq_flags
&= ~XFS_DQ_DIRTY
;
1147 xfs_trans_ail_copy_lsn(mp
->m_ail
, &dqp
->q_logitem
.qli_flush_lsn
,
1148 &dqp
->q_logitem
.qli_item
.li_lsn
);
1151 * copy the lsn into the on-disk dquot now while we have the in memory
1152 * dquot here. This can't be done later in the write verifier as we
1153 * can't get access to the log item at that point in time.
1155 if (xfs_sb_version_hascrc(&mp
->m_sb
)) {
1156 struct xfs_dqblk
*dqb
= (struct xfs_dqblk
*)ddqp
;
1158 dqb
->dd_lsn
= cpu_to_be64(dqp
->q_logitem
.qli_item
.li_lsn
);
1162 * Attach an iodone routine so that we can remove this dquot from the
1163 * AIL and release the flush lock once the dquot is synced to disk.
1165 xfs_buf_attach_iodone(bp
, xfs_qm_dqflush_done
,
1166 &dqp
->q_logitem
.qli_item
);
1169 * If the buffer is pinned then push on the log so we won't
1170 * get stuck waiting in the write for too long.
1172 if (xfs_buf_ispinned(bp
)) {
1173 trace_xfs_dqflush_force(dqp
);
1174 xfs_log_force(mp
, 0);
1177 trace_xfs_dqflush_done(dqp
);
1183 return XFS_ERROR(EIO
);
1187 * Lock two xfs_dquot structures.
1189 * To avoid deadlocks we always lock the quota structure with
1190 * the lowerd id first.
1199 if (be32_to_cpu(d1
->q_core
.d_id
) >
1200 be32_to_cpu(d2
->q_core
.d_id
)) {
1201 mutex_lock(&d2
->q_qlock
);
1202 mutex_lock_nested(&d1
->q_qlock
, XFS_QLOCK_NESTED
);
1204 mutex_lock(&d1
->q_qlock
);
1205 mutex_lock_nested(&d2
->q_qlock
, XFS_QLOCK_NESTED
);
1208 mutex_lock(&d1
->q_qlock
);
1210 mutex_lock(&d2
->q_qlock
);
1218 kmem_zone_init(sizeof(struct xfs_dquot
), "xfs_dquot");
1223 kmem_zone_init(sizeof(struct xfs_dquot_acct
), "xfs_dqtrx");
1224 if (!xfs_qm_dqtrxzone
)
1225 goto out_free_dqzone
;
1230 kmem_zone_destroy(xfs_qm_dqzone
);
1238 kmem_zone_destroy(xfs_qm_dqtrxzone
);
1239 kmem_zone_destroy(xfs_qm_dqzone
);