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kernel_samsung_sm7125/fs/xfs/quota/xfs_dquot.c

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/*
* Copyright (c) 2000-2003 Silicon Graphics, Inc. All Rights Reserved.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of version 2 of the GNU General Public License as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it would be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
*
* Further, this software is distributed without any warranty that it is
* free of the rightful claim of any third person regarding infringement
* or the like. Any license provided herein, whether implied or
* otherwise, applies only to this software file. Patent licenses, if
* any, provided herein do not apply to combinations of this program with
* other software, or any other product whatsoever.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write the Free Software Foundation, Inc., 59
* Temple Place - Suite 330, Boston MA 02111-1307, USA.
*
* Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy,
* Mountain View, CA 94043, or:
*
* http://www.sgi.com
*
* For further information regarding this notice, see:
*
* http://oss.sgi.com/projects/GenInfo/SGIGPLNoticeExplan/
*/
#include "xfs.h"
#include "xfs_fs.h"
#include "xfs_inum.h"
#include "xfs_log.h"
#include "xfs_trans.h"
#include "xfs_sb.h"
#include "xfs_ag.h"
#include "xfs_dir.h"
#include "xfs_dir2.h"
#include "xfs_alloc.h"
#include "xfs_dmapi.h"
#include "xfs_quota.h"
#include "xfs_mount.h"
#include "xfs_alloc_btree.h"
#include "xfs_bmap_btree.h"
#include "xfs_ialloc_btree.h"
#include "xfs_btree.h"
#include "xfs_ialloc.h"
#include "xfs_attr_sf.h"
#include "xfs_dir_sf.h"
#include "xfs_dir2_sf.h"
#include "xfs_dinode.h"
#include "xfs_inode.h"
#include "xfs_bmap.h"
#include "xfs_bit.h"
#include "xfs_rtalloc.h"
#include "xfs_error.h"
#include "xfs_itable.h"
#include "xfs_rw.h"
#include "xfs_acl.h"
#include "xfs_cap.h"
#include "xfs_mac.h"
#include "xfs_attr.h"
#include "xfs_buf_item.h"
#include "xfs_trans_space.h"
#include "xfs_trans_priv.h"
#include "xfs_qm.h"
/*
LOCK ORDER
inode lock (ilock)
dquot hash-chain lock (hashlock)
xqm dquot freelist lock (freelistlock
mount's dquot list lock (mplistlock)
user dquot lock - lock ordering among dquots is based on the uid or gid
group dquot lock - similar to udquots. Between the two dquots, the udquot
has to be locked first.
pin lock - the dquot lock must be held to take this lock.
flush lock - ditto.
*/
STATIC void xfs_qm_dqflush_done(xfs_buf_t *, xfs_dq_logitem_t *);
#ifdef DEBUG
xfs_buftarg_t *xfs_dqerror_target;
int xfs_do_dqerror;
int xfs_dqreq_num;
int xfs_dqerror_mod = 33;
#endif
/*
* Allocate and initialize a dquot. We don't always allocate fresh memory;
* we try to reclaim a free dquot if the number of incore dquots are above
* a threshold.
* The only field inside the core that gets initialized at this point
* is the d_id field. The idea is to fill in the entire q_core
* when we read in the on disk dquot.
*/
STATIC xfs_dquot_t *
xfs_qm_dqinit(
xfs_mount_t *mp,
xfs_dqid_t id,
uint type)
{
xfs_dquot_t *dqp;
boolean_t brandnewdquot;
brandnewdquot = xfs_qm_dqalloc_incore(&dqp);
dqp->dq_flags = type;
INT_SET(dqp->q_core.d_id, ARCH_CONVERT, id);
dqp->q_mount = mp;
/*
* No need to re-initialize these if this is a reclaimed dquot.
*/
if (brandnewdquot) {
dqp->dq_flnext = dqp->dq_flprev = dqp;
mutex_init(&dqp->q_qlock, MUTEX_DEFAULT, "xdq");
initnsema(&dqp->q_flock, 1, "fdq");
sv_init(&dqp->q_pinwait, SV_DEFAULT, "pdq");
#ifdef XFS_DQUOT_TRACE
dqp->q_trace = ktrace_alloc(DQUOT_TRACE_SIZE, KM_SLEEP);
xfs_dqtrace_entry(dqp, "DQINIT");
#endif
} else {
/*
* Only the q_core portion was zeroed in dqreclaim_one().
* So, we need to reset others.
*/
dqp->q_nrefs = 0;
dqp->q_blkno = 0;
dqp->MPL_NEXT = dqp->HL_NEXT = NULL;
dqp->HL_PREVP = dqp->MPL_PREVP = NULL;
dqp->q_bufoffset = 0;
dqp->q_fileoffset = 0;
dqp->q_transp = NULL;
dqp->q_gdquot = NULL;
dqp->q_res_bcount = 0;
dqp->q_res_icount = 0;
dqp->q_res_rtbcount = 0;
dqp->q_pincount = 0;
dqp->q_hash = NULL;
ASSERT(dqp->dq_flnext == dqp->dq_flprev);
#ifdef XFS_DQUOT_TRACE
ASSERT(dqp->q_trace);
xfs_dqtrace_entry(dqp, "DQRECLAIMED_INIT");
#endif
}
/*
* log item gets initialized later
*/
return (dqp);
}
/*
* This is called to free all the memory associated with a dquot
*/
void
xfs_qm_dqdestroy(
xfs_dquot_t *dqp)
{
ASSERT(! XFS_DQ_IS_ON_FREELIST(dqp));
mutex_destroy(&dqp->q_qlock);
freesema(&dqp->q_flock);
sv_destroy(&dqp->q_pinwait);
#ifdef XFS_DQUOT_TRACE
if (dqp->q_trace)
ktrace_free(dqp->q_trace);
dqp->q_trace = NULL;
#endif
kmem_zone_free(xfs_Gqm->qm_dqzone, dqp);
atomic_dec(&xfs_Gqm->qm_totaldquots);
}
/*
* This is what a 'fresh' dquot inside a dquot chunk looks like on disk.
*/
STATIC void
xfs_qm_dqinit_core(
xfs_dqid_t id,
uint type,
xfs_dqblk_t *d)
{
/*
* Caller has zero'd the entire dquot 'chunk' already.
*/
INT_SET(d->dd_diskdq.d_magic, ARCH_CONVERT, XFS_DQUOT_MAGIC);
INT_SET(d->dd_diskdq.d_version, ARCH_CONVERT, XFS_DQUOT_VERSION);
INT_SET(d->dd_diskdq.d_id, ARCH_CONVERT, id);
INT_SET(d->dd_diskdq.d_flags, ARCH_CONVERT, type);
}
#ifdef XFS_DQUOT_TRACE
/*
* Dquot tracing for debugging.
*/
/* ARGSUSED */
void
__xfs_dqtrace_entry(
xfs_dquot_t *dqp,
char *func,
void *retaddr,
xfs_inode_t *ip)
{
xfs_dquot_t *udqp = NULL;
xfs_ino_t ino = 0;
ASSERT(dqp->q_trace);
if (ip) {
ino = ip->i_ino;
udqp = ip->i_udquot;
}
ktrace_enter(dqp->q_trace,
(void *)(__psint_t)DQUOT_KTRACE_ENTRY,
(void *)func,
(void *)(__psint_t)dqp->q_nrefs,
(void *)(__psint_t)dqp->dq_flags,
(void *)(__psint_t)dqp->q_res_bcount,
(void *)(__psint_t)INT_GET(dqp->q_core.d_bcount,
ARCH_CONVERT),
(void *)(__psint_t)INT_GET(dqp->q_core.d_icount,
ARCH_CONVERT),
(void *)(__psint_t)INT_GET(dqp->q_core.d_blk_hardlimit,
ARCH_CONVERT),
(void *)(__psint_t)INT_GET(dqp->q_core.d_blk_softlimit,
ARCH_CONVERT),
(void *)(__psint_t)INT_GET(dqp->q_core.d_ino_hardlimit,
ARCH_CONVERT),
(void *)(__psint_t)INT_GET(dqp->q_core.d_ino_softlimit,
ARCH_CONVERT),
(void *)(__psint_t)INT_GET(dqp->q_core.d_id, ARCH_CONVERT),
(void *)(__psint_t)current_pid(),
(void *)(__psint_t)ino,
(void *)(__psint_t)retaddr,
(void *)(__psint_t)udqp);
return;
}
#endif
/*
* If default limits are in force, push them into the dquot now.
* We overwrite the dquot limits only if they are zero and this
* is not the root dquot.
*/
void
xfs_qm_adjust_dqlimits(
xfs_mount_t *mp,
xfs_disk_dquot_t *d)
{
xfs_quotainfo_t *q = mp->m_quotainfo;
ASSERT(d->d_id);
if (q->qi_bsoftlimit && !d->d_blk_softlimit)
INT_SET(d->d_blk_softlimit, ARCH_CONVERT, q->qi_bsoftlimit);
if (q->qi_bhardlimit && !d->d_blk_hardlimit)
INT_SET(d->d_blk_hardlimit, ARCH_CONVERT, q->qi_bhardlimit);
if (q->qi_isoftlimit && !d->d_ino_softlimit)
INT_SET(d->d_ino_softlimit, ARCH_CONVERT, q->qi_isoftlimit);
if (q->qi_ihardlimit && !d->d_ino_hardlimit)
INT_SET(d->d_ino_hardlimit, ARCH_CONVERT, q->qi_ihardlimit);
if (q->qi_rtbsoftlimit && !d->d_rtb_softlimit)
INT_SET(d->d_rtb_softlimit, ARCH_CONVERT, q->qi_rtbsoftlimit);
if (q->qi_rtbhardlimit && !d->d_rtb_hardlimit)
INT_SET(d->d_rtb_hardlimit, ARCH_CONVERT, q->qi_rtbhardlimit);
}
/*
* Check the limits and timers of a dquot and start or reset timers
* if necessary.
* This gets called even when quota enforcement is OFF, which makes our
* life a little less complicated. (We just don't reject any quota
* reservations in that case, when enforcement is off).
* We also return 0 as the values of the timers in Q_GETQUOTA calls, when
* enforcement's off.
* In contrast, warnings are a little different in that they don't
* 'automatically' get started when limits get exceeded. They do
* get reset to zero, however, when we find the count to be under
* the soft limit (they are only ever set non-zero via userspace).
*/
void
xfs_qm_adjust_dqtimers(
xfs_mount_t *mp,
xfs_disk_dquot_t *d)
{
ASSERT(d->d_id);
#ifdef QUOTADEBUG
if (INT_GET(d->d_blk_hardlimit, ARCH_CONVERT))
ASSERT(INT_GET(d->d_blk_softlimit, ARCH_CONVERT) <=
INT_GET(d->d_blk_hardlimit, ARCH_CONVERT));
if (INT_GET(d->d_ino_hardlimit, ARCH_CONVERT))
ASSERT(INT_GET(d->d_ino_softlimit, ARCH_CONVERT) <=
INT_GET(d->d_ino_hardlimit, ARCH_CONVERT));
if (INT_GET(d->d_rtb_hardlimit, ARCH_CONVERT))
ASSERT(INT_GET(d->d_rtb_softlimit, ARCH_CONVERT) <=
INT_GET(d->d_rtb_hardlimit, ARCH_CONVERT));
#endif
if (!d->d_btimer) {
if ((INT_GET(d->d_blk_softlimit, ARCH_CONVERT) &&
(INT_GET(d->d_bcount, ARCH_CONVERT) >=
INT_GET(d->d_blk_softlimit, ARCH_CONVERT))) ||
(INT_GET(d->d_blk_hardlimit, ARCH_CONVERT) &&
(INT_GET(d->d_bcount, ARCH_CONVERT) >=
INT_GET(d->d_blk_hardlimit, ARCH_CONVERT)))) {
INT_SET(d->d_btimer, ARCH_CONVERT,
get_seconds() + XFS_QI_BTIMELIMIT(mp));
} else {
d->d_bwarns = 0;
}
} else {
if ((!d->d_blk_softlimit ||
(INT_GET(d->d_bcount, ARCH_CONVERT) <
INT_GET(d->d_blk_softlimit, ARCH_CONVERT))) &&
(!d->d_blk_hardlimit ||
(INT_GET(d->d_bcount, ARCH_CONVERT) <
INT_GET(d->d_blk_hardlimit, ARCH_CONVERT)))) {
d->d_btimer = 0;
}
}
if (!d->d_itimer) {
if ((INT_GET(d->d_ino_softlimit, ARCH_CONVERT) &&
(INT_GET(d->d_icount, ARCH_CONVERT) >=
INT_GET(d->d_ino_softlimit, ARCH_CONVERT))) ||
(INT_GET(d->d_ino_hardlimit, ARCH_CONVERT) &&
(INT_GET(d->d_icount, ARCH_CONVERT) >=
INT_GET(d->d_ino_hardlimit, ARCH_CONVERT)))) {
INT_SET(d->d_itimer, ARCH_CONVERT,
get_seconds() + XFS_QI_ITIMELIMIT(mp));
} else {
d->d_iwarns = 0;
}
} else {
if ((!d->d_ino_softlimit ||
(INT_GET(d->d_icount, ARCH_CONVERT) <
INT_GET(d->d_ino_softlimit, ARCH_CONVERT))) &&
(!d->d_ino_hardlimit ||
(INT_GET(d->d_icount, ARCH_CONVERT) <
INT_GET(d->d_ino_hardlimit, ARCH_CONVERT)))) {
d->d_itimer = 0;
}
}
if (!d->d_rtbtimer) {
if ((INT_GET(d->d_rtb_softlimit, ARCH_CONVERT) &&
(INT_GET(d->d_rtbcount, ARCH_CONVERT) >=
INT_GET(d->d_rtb_softlimit, ARCH_CONVERT))) ||
(INT_GET(d->d_rtb_hardlimit, ARCH_CONVERT) &&
(INT_GET(d->d_rtbcount, ARCH_CONVERT) >=
INT_GET(d->d_rtb_hardlimit, ARCH_CONVERT)))) {
INT_SET(d->d_rtbtimer, ARCH_CONVERT,
get_seconds() + XFS_QI_RTBTIMELIMIT(mp));
} else {
d->d_rtbwarns = 0;
}
} else {
if ((!d->d_rtb_softlimit ||
(INT_GET(d->d_rtbcount, ARCH_CONVERT) <
INT_GET(d->d_rtb_softlimit, ARCH_CONVERT))) &&
(!d->d_rtb_hardlimit ||
(INT_GET(d->d_rtbcount, ARCH_CONVERT) <
INT_GET(d->d_rtb_hardlimit, ARCH_CONVERT)))) {
d->d_rtbtimer = 0;
}
}
}
/*
* initialize a buffer full of dquots and log the whole thing
*/
STATIC void
xfs_qm_init_dquot_blk(
xfs_trans_t *tp,
xfs_mount_t *mp,
xfs_dqid_t id,
uint type,
xfs_buf_t *bp)
{
xfs_dqblk_t *d;
int curid, i;
ASSERT(tp);
ASSERT(XFS_BUF_ISBUSY(bp));
ASSERT(XFS_BUF_VALUSEMA(bp) <= 0);
d = (xfs_dqblk_t *)XFS_BUF_PTR(bp);
/*
* ID of the first dquot in the block - id's are zero based.
*/
curid = id - (id % XFS_QM_DQPERBLK(mp));
ASSERT(curid >= 0);
memset(d, 0, BBTOB(XFS_QI_DQCHUNKLEN(mp)));
for (i = 0; i < XFS_QM_DQPERBLK(mp); i++, d++, curid++)
xfs_qm_dqinit_core(curid, type, d);
xfs_trans_dquot_buf(tp, bp,
(type & XFS_DQ_USER ? XFS_BLI_UDQUOT_BUF :
((type & XFS_DQ_PROJ) ? XFS_BLI_PDQUOT_BUF :
XFS_BLI_GDQUOT_BUF)));
xfs_trans_log_buf(tp, bp, 0, BBTOB(XFS_QI_DQCHUNKLEN(mp)) - 1);
}
/*
* Allocate a block and fill it with dquots.
* This is called when the bmapi finds a hole.
*/
STATIC int
xfs_qm_dqalloc(
xfs_trans_t **tpp,
xfs_mount_t *mp,
xfs_dquot_t *dqp,
xfs_inode_t *quotip,
xfs_fileoff_t offset_fsb,
xfs_buf_t **O_bpp)
{
xfs_fsblock_t firstblock;
xfs_bmap_free_t flist;
xfs_bmbt_irec_t map;
int nmaps, error, committed;
xfs_buf_t *bp;
xfs_trans_t *tp = *tpp;
ASSERT(tp != NULL);
xfs_dqtrace_entry(dqp, "DQALLOC");
/*
* Initialize the bmap freelist prior to calling bmapi code.
*/
XFS_BMAP_INIT(&flist, &firstblock);
xfs_ilock(quotip, XFS_ILOCK_EXCL);
/*
* Return if this type of quotas is turned off while we didn't
* have an inode lock
*/
if (XFS_IS_THIS_QUOTA_OFF(dqp)) {
xfs_iunlock(quotip, XFS_ILOCK_EXCL);
return (ESRCH);
}
/*
* xfs_trans_commit normally decrements the vnode ref count
* when it unlocks the inode. Since we want to keep the quota
* inode around, we bump the vnode ref count now.
*/
VN_HOLD(XFS_ITOV(quotip));
xfs_trans_ijoin(tp, quotip, XFS_ILOCK_EXCL);
nmaps = 1;
if ((error = xfs_bmapi(tp, quotip,
offset_fsb, XFS_DQUOT_CLUSTER_SIZE_FSB,
XFS_BMAPI_METADATA | XFS_BMAPI_WRITE,
&firstblock,
XFS_QM_DQALLOC_SPACE_RES(mp),
&map, &nmaps, &flist))) {
goto error0;
}
ASSERT(map.br_blockcount == XFS_DQUOT_CLUSTER_SIZE_FSB);
ASSERT(nmaps == 1);
ASSERT((map.br_startblock != DELAYSTARTBLOCK) &&
(map.br_startblock != HOLESTARTBLOCK));
/*
* Keep track of the blkno to save a lookup later
*/
dqp->q_blkno = XFS_FSB_TO_DADDR(mp, map.br_startblock);
/* now we can just get the buffer (there's nothing to read yet) */
bp = xfs_trans_get_buf(tp, mp->m_ddev_targp,
dqp->q_blkno,
XFS_QI_DQCHUNKLEN(mp),
0);
if (!bp || (error = XFS_BUF_GETERROR(bp)))
goto error1;
/*
* Make a chunk of dquots out of this buffer and log
* the entire thing.
*/
xfs_qm_init_dquot_blk(tp, mp, INT_GET(dqp->q_core.d_id, ARCH_CONVERT),
dqp->dq_flags & XFS_DQ_ALLTYPES, bp);
/*
* xfs_bmap_finish() may commit the current transaction and
* start a second transaction if the freelist is not empty.
*
* Since we still want to modify this buffer, we need to
* ensure that the buffer is not released on commit of
* the first transaction and ensure the buffer is added to the
* second transaction.
*
* If there is only one transaction then don't stop the buffer
* from being released when it commits later on.
*/
xfs_trans_bhold(tp, bp);
if ((error = xfs_bmap_finish(tpp, &flist, firstblock, &committed))) {
goto error1;
}
if (committed) {
tp = *tpp;
xfs_trans_bjoin(tp, bp);
} else {
xfs_trans_bhold_release(tp, bp);
}
*O_bpp = bp;
return 0;
error1:
xfs_bmap_cancel(&flist);
error0:
xfs_iunlock(quotip, XFS_ILOCK_EXCL);
return (error);
}
/*
* Maps a dquot to the buffer containing its on-disk version.
* This returns a ptr to the buffer containing the on-disk dquot
* in the bpp param, and a ptr to the on-disk dquot within that buffer
*/
STATIC int
xfs_qm_dqtobp(
xfs_trans_t **tpp,
xfs_dquot_t *dqp,
xfs_disk_dquot_t **O_ddpp,
xfs_buf_t **O_bpp,
uint flags)
{
xfs_bmbt_irec_t map;
int nmaps, error;
xfs_buf_t *bp;
xfs_inode_t *quotip;
xfs_mount_t *mp;
xfs_disk_dquot_t *ddq;
xfs_dqid_t id;
boolean_t newdquot;
xfs_trans_t *tp = (tpp ? *tpp : NULL);
mp = dqp->q_mount;
id = INT_GET(dqp->q_core.d_id, ARCH_CONVERT);
nmaps = 1;
newdquot = B_FALSE;
/*
* If we don't know where the dquot lives, find out.
*/
if (dqp->q_blkno == (xfs_daddr_t) 0) {
/* We use the id as an index */
dqp->q_fileoffset = (xfs_fileoff_t) ((uint)id /
XFS_QM_DQPERBLK(mp));
nmaps = 1;
quotip = XFS_DQ_TO_QIP(dqp);
xfs_ilock(quotip, XFS_ILOCK_SHARED);
/*
* Return if this type of quotas is turned off while we didn't
* have an inode lock
*/
if (XFS_IS_THIS_QUOTA_OFF(dqp)) {
xfs_iunlock(quotip, XFS_ILOCK_SHARED);
return (ESRCH);
}
/*
* Find the block map; no allocations yet
*/
error = xfs_bmapi(NULL, quotip, dqp->q_fileoffset,
XFS_DQUOT_CLUSTER_SIZE_FSB,
XFS_BMAPI_METADATA,
NULL, 0, &map, &nmaps, NULL);
xfs_iunlock(quotip, XFS_ILOCK_SHARED);
if (error)
return (error);
ASSERT(nmaps == 1);
ASSERT(map.br_blockcount == 1);
/*
* offset of dquot in the (fixed sized) dquot chunk.
*/
dqp->q_bufoffset = (id % XFS_QM_DQPERBLK(mp)) *
sizeof(xfs_dqblk_t);
if (map.br_startblock == HOLESTARTBLOCK) {
/*
* We don't allocate unless we're asked to
*/
if (!(flags & XFS_QMOPT_DQALLOC))
return (ENOENT);
ASSERT(tp);
if ((error = xfs_qm_dqalloc(tpp, mp, dqp, quotip,
dqp->q_fileoffset, &bp)))
return (error);
tp = *tpp;
newdquot = B_TRUE;
} else {
/*
* store the blkno etc so that we don't have to do the
* mapping all the time
*/
dqp->q_blkno = XFS_FSB_TO_DADDR(mp, map.br_startblock);
}
}
ASSERT(dqp->q_blkno != DELAYSTARTBLOCK);
ASSERT(dqp->q_blkno != HOLESTARTBLOCK);
/*
* Read in the buffer, unless we've just done the allocation
* (in which case we already have the buf).
*/
if (! newdquot) {
xfs_dqtrace_entry(dqp, "DQTOBP READBUF");
if ((error = xfs_trans_read_buf(mp, tp, mp->m_ddev_targp,
dqp->q_blkno,
XFS_QI_DQCHUNKLEN(mp),
0, &bp))) {
return (error);
}
if (error || !bp)
return XFS_ERROR(error);
}
ASSERT(XFS_BUF_ISBUSY(bp));
ASSERT(XFS_BUF_VALUSEMA(bp) <= 0);
/*
* calculate the location of the dquot inside the buffer.
*/
ddq = (xfs_disk_dquot_t *)((char *)XFS_BUF_PTR(bp) + dqp->q_bufoffset);
/*
* A simple sanity check in case we got a corrupted dquot...
*/
if (xfs_qm_dqcheck(ddq, id, dqp->dq_flags & XFS_DQ_ALLTYPES,
flags & (XFS_QMOPT_DQREPAIR|XFS_QMOPT_DOWARN),
"dqtobp")) {
if (!(flags & XFS_QMOPT_DQREPAIR)) {
xfs_trans_brelse(tp, bp);
return XFS_ERROR(EIO);
}
XFS_BUF_BUSY(bp); /* We dirtied this */
}
*O_bpp = bp;
*O_ddpp = ddq;
return (0);
}
/*
* Read in the ondisk dquot using dqtobp() then copy it to an incore version,
* and release the buffer immediately.
*
*/
/* ARGSUSED */
STATIC int
xfs_qm_dqread(
xfs_trans_t **tpp,
xfs_dqid_t id,
xfs_dquot_t *dqp, /* dquot to get filled in */
uint flags)
{
xfs_disk_dquot_t *ddqp;
xfs_buf_t *bp;
int error;
xfs_trans_t *tp;
ASSERT(tpp);
/*
* get a pointer to the on-disk dquot and the buffer containing it
* dqp already knows its own type (GROUP/USER).
*/
xfs_dqtrace_entry(dqp, "DQREAD");
if ((error = xfs_qm_dqtobp(tpp, dqp, &ddqp, &bp, flags))) {
return (error);
}
tp = *tpp;
/* copy everything from disk dquot to the incore dquot */
memcpy(&dqp->q_core, ddqp, sizeof(xfs_disk_dquot_t));
ASSERT(INT_GET(dqp->q_core.d_id, ARCH_CONVERT) == id);
xfs_qm_dquot_logitem_init(dqp);
/*
* Reservation counters are defined as reservation plus current usage
* to avoid having to add everytime.
*/
dqp->q_res_bcount = INT_GET(ddqp->d_bcount, ARCH_CONVERT);
dqp->q_res_icount = INT_GET(ddqp->d_icount, ARCH_CONVERT);
dqp->q_res_rtbcount = INT_GET(ddqp->d_rtbcount, ARCH_CONVERT);
/* Mark the buf so that this will stay incore a little longer */
XFS_BUF_SET_VTYPE_REF(bp, B_FS_DQUOT, XFS_DQUOT_REF);
/*
* We got the buffer with a xfs_trans_read_buf() (in dqtobp())
* So we need to release with xfs_trans_brelse().
* The strategy here is identical to that of inodes; we lock
* the dquot in xfs_qm_dqget() before making it accessible to
* others. This is because dquots, like inodes, need a good level of
* concurrency, and we don't want to take locks on the entire buffers
* for dquot accesses.
* Note also that the dquot buffer may even be dirty at this point, if
* this particular dquot was repaired. We still aren't afraid to
* brelse it because we have the changes incore.
*/
ASSERT(XFS_BUF_ISBUSY(bp));
ASSERT(XFS_BUF_VALUSEMA(bp) <= 0);
xfs_trans_brelse(tp, bp);
return (error);
}
/*
* allocate an incore dquot from the kernel heap,
* and fill its core with quota information kept on disk.
* If XFS_QMOPT_DQALLOC is set, it'll allocate a dquot on disk
* if it wasn't already allocated.
*/
STATIC int
xfs_qm_idtodq(
xfs_mount_t *mp,
xfs_dqid_t id, /* gid or uid, depending on type */
uint type, /* UDQUOT or GDQUOT */
uint flags, /* DQALLOC, DQREPAIR */
xfs_dquot_t **O_dqpp)/* OUT : incore dquot, not locked */
{
xfs_dquot_t *dqp;
int error;
xfs_trans_t *tp;
int cancelflags=0;
dqp = xfs_qm_dqinit(mp, id, type);
tp = NULL;
if (flags & XFS_QMOPT_DQALLOC) {
tp = xfs_trans_alloc(mp, XFS_TRANS_QM_DQALLOC);
if ((error = xfs_trans_reserve(tp,
XFS_QM_DQALLOC_SPACE_RES(mp),
XFS_WRITE_LOG_RES(mp) +
BBTOB(XFS_QI_DQCHUNKLEN(mp)) - 1 +
128,
0,
XFS_TRANS_PERM_LOG_RES,
XFS_WRITE_LOG_COUNT))) {
cancelflags = 0;
goto error0;
}
cancelflags = XFS_TRANS_RELEASE_LOG_RES;
}
/*
* Read it from disk; xfs_dqread() takes care of
* all the necessary initialization of dquot's fields (locks, etc)
*/
if ((error = xfs_qm_dqread(&tp, id, dqp, flags))) {
/*
* This can happen if quotas got turned off (ESRCH),
* or if the dquot didn't exist on disk and we ask to
* allocate (ENOENT).
*/
xfs_dqtrace_entry(dqp, "DQREAD FAIL");
cancelflags |= XFS_TRANS_ABORT;
goto error0;
}
if (tp) {
if ((error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES,
NULL)))
goto error1;
}
*O_dqpp = dqp;
return (0);
error0:
ASSERT(error);
if (tp)
xfs_trans_cancel(tp, cancelflags);
error1:
xfs_qm_dqdestroy(dqp);
*O_dqpp = NULL;
return (error);
}
/*
* Lookup a dquot in the incore dquot hashtable. We keep two separate
* hashtables for user and group dquots; and, these are global tables
* inside the XQM, not per-filesystem tables.
* The hash chain must be locked by caller, and it is left locked
* on return. Returning dquot is locked.
*/
STATIC int
xfs_qm_dqlookup(
xfs_mount_t *mp,
xfs_dqid_t id,
xfs_dqhash_t *qh,
xfs_dquot_t **O_dqpp)
{
xfs_dquot_t *dqp;
uint flist_locked;
xfs_dquot_t *d;
ASSERT(XFS_DQ_IS_HASH_LOCKED(qh));
flist_locked = B_FALSE;
/*
* Traverse the hashchain looking for a match
*/
for (dqp = qh->qh_next; dqp != NULL; dqp = dqp->HL_NEXT) {
/*
* We already have the hashlock. We don't need the
* dqlock to look at the id field of the dquot, since the
* id can't be modified without the hashlock anyway.
*/
if (INT_GET(dqp->q_core.d_id, ARCH_CONVERT) == id && dqp->q_mount == mp) {
xfs_dqtrace_entry(dqp, "DQFOUND BY LOOKUP");
/*
* All in core dquots must be on the dqlist of mp
*/
ASSERT(dqp->MPL_PREVP != NULL);
xfs_dqlock(dqp);
if (dqp->q_nrefs == 0) {
ASSERT (XFS_DQ_IS_ON_FREELIST(dqp));
if (! xfs_qm_freelist_lock_nowait(xfs_Gqm)) {
xfs_dqtrace_entry(dqp, "DQLOOKUP: WANT");
/*
* We may have raced with dqreclaim_one()
* (and lost). So, flag that we don't
* want the dquot to be reclaimed.
*/
dqp->dq_flags |= XFS_DQ_WANT;
xfs_dqunlock(dqp);
xfs_qm_freelist_lock(xfs_Gqm);
xfs_dqlock(dqp);
dqp->dq_flags &= ~(XFS_DQ_WANT);
}
flist_locked = B_TRUE;
}
/*
* id couldn't have changed; we had the hashlock all
* along
*/
ASSERT(INT_GET(dqp->q_core.d_id, ARCH_CONVERT) == id);
if (flist_locked) {
if (dqp->q_nrefs != 0) {
xfs_qm_freelist_unlock(xfs_Gqm);
flist_locked = B_FALSE;
} else {
/*
* take it off the freelist
*/
xfs_dqtrace_entry(dqp,
"DQLOOKUP: TAKEOFF FL");
XQM_FREELIST_REMOVE(dqp);
/* xfs_qm_freelist_print(&(xfs_Gqm->
qm_dqfreelist),
"after removal"); */
}
}
/*
* grab a reference
*/
XFS_DQHOLD(dqp);
if (flist_locked)
xfs_qm_freelist_unlock(xfs_Gqm);
/*
* move the dquot to the front of the hashchain
*/
ASSERT(XFS_DQ_IS_HASH_LOCKED(qh));
if (dqp->HL_PREVP != &qh->qh_next) {
xfs_dqtrace_entry(dqp,
"DQLOOKUP: HASH MOVETOFRONT");
if ((d = dqp->HL_NEXT))
d->HL_PREVP = dqp->HL_PREVP;
*(dqp->HL_PREVP) = d;
d = qh->qh_next;
d->HL_PREVP = &dqp->HL_NEXT;
dqp->HL_NEXT = d;
dqp->HL_PREVP = &qh->qh_next;
qh->qh_next = dqp;
}
xfs_dqtrace_entry(dqp, "LOOKUP END");
*O_dqpp = dqp;
ASSERT(XFS_DQ_IS_HASH_LOCKED(qh));
return (0);
}
}
*O_dqpp = NULL;
ASSERT(XFS_DQ_IS_HASH_LOCKED(qh));
return (1);
}
/*
* Given the file system, inode OR id, and type (UDQUOT/GDQUOT), return a
* a locked dquot, doing an allocation (if requested) as needed.
* When both an inode and an id are given, the inode's id takes precedence.
* That is, if the id changes while we don't hold the ilock inside this
* function, the new dquot is returned, not necessarily the one requested
* in the id argument.
*/
int
xfs_qm_dqget(
xfs_mount_t *mp,
xfs_inode_t *ip, /* locked inode (optional) */
xfs_dqid_t id, /* uid/projid/gid depending on type */
uint type, /* XFS_DQ_USER/XFS_DQ_PROJ/XFS_DQ_GROUP */
uint flags, /* DQALLOC, DQSUSER, DQREPAIR, DOWARN */
xfs_dquot_t **O_dqpp) /* OUT : locked incore dquot */
{
xfs_dquot_t *dqp;
xfs_dqhash_t *h;
uint version;
int error;
ASSERT(XFS_IS_QUOTA_RUNNING(mp));
if ((! XFS_IS_UQUOTA_ON(mp) && type == XFS_DQ_USER) ||
(! XFS_IS_PQUOTA_ON(mp) && type == XFS_DQ_PROJ) ||
(! XFS_IS_GQUOTA_ON(mp) && type == XFS_DQ_GROUP)) {
return (ESRCH);
}
h = XFS_DQ_HASH(mp, id, type);
#ifdef DEBUG
if (xfs_do_dqerror) {
if ((xfs_dqerror_target == mp->m_ddev_targp) &&
(xfs_dqreq_num++ % xfs_dqerror_mod) == 0) {
cmn_err(CE_DEBUG, "Returning error in dqget");
return (EIO);
}
}
#endif
again:
#ifdef DEBUG
ASSERT(type == XFS_DQ_USER ||
type == XFS_DQ_PROJ ||
type == XFS_DQ_GROUP);
if (ip) {
ASSERT(XFS_ISLOCKED_INODE_EXCL(ip));
if (type == XFS_DQ_USER)
ASSERT(ip->i_udquot == NULL);
else
ASSERT(ip->i_gdquot == NULL);
}
#endif
XFS_DQ_HASH_LOCK(h);
/*
* Look in the cache (hashtable).
* The chain is kept locked during lookup.
*/
if (xfs_qm_dqlookup(mp, id, h, O_dqpp) == 0) {
XQM_STATS_INC(xqmstats.xs_qm_dqcachehits);
/*
* The dquot was found, moved to the front of the chain,
* taken off the freelist if it was on it, and locked
* at this point. Just unlock the hashchain and return.
*/
ASSERT(*O_dqpp);
ASSERT(XFS_DQ_IS_LOCKED(*O_dqpp));
XFS_DQ_HASH_UNLOCK(h);
xfs_dqtrace_entry(*O_dqpp, "DQGET DONE (FROM CACHE)");
return (0); /* success */
}
XQM_STATS_INC(xqmstats.xs_qm_dqcachemisses);
/*
* Dquot cache miss. We don't want to keep the inode lock across
* a (potential) disk read. Also we don't want to deal with the lock
* ordering between quotainode and this inode. OTOH, dropping the inode
* lock here means dealing with a chown that can happen before
* we re-acquire the lock.
*/
if (ip)
xfs_iunlock(ip, XFS_ILOCK_EXCL);
/*
* Save the hashchain version stamp, and unlock the chain, so that
* we don't keep the lock across a disk read
*/
version = h->qh_version;
XFS_DQ_HASH_UNLOCK(h);
/*
* Allocate the dquot on the kernel heap, and read the ondisk
* portion off the disk. Also, do all the necessary initialization
* This can return ENOENT if dquot didn't exist on disk and we didn't
* ask it to allocate; ESRCH if quotas got turned off suddenly.
*/
if ((error = xfs_qm_idtodq(mp, id, type,
flags & (XFS_QMOPT_DQALLOC|XFS_QMOPT_DQREPAIR|
XFS_QMOPT_DOWARN),
&dqp))) {
if (ip)
xfs_ilock(ip, XFS_ILOCK_EXCL);
return (error);
}
/*
* See if this is mount code calling to look at the overall quota limits
* which are stored in the id == 0 user or group's dquot.
* Since we may not have done a quotacheck by this point, just return
* the dquot without attaching it to any hashtables, lists, etc, or even
* taking a reference.
* The caller must dqdestroy this once done.
*/
if (flags & XFS_QMOPT_DQSUSER) {
ASSERT(id == 0);
ASSERT(! ip);
goto dqret;
}
/*
* Dquot lock comes after hashlock in the lock ordering
*/
if (ip) {
xfs_ilock(ip, XFS_ILOCK_EXCL);
if (! XFS_IS_DQTYPE_ON(mp, type)) {
/* inode stays locked on return */
xfs_qm_dqdestroy(dqp);
return XFS_ERROR(ESRCH);
}
/*
* A dquot could be attached to this inode by now, since
* we had dropped the ilock.
*/
if (type == XFS_DQ_USER) {
if (ip->i_udquot) {
xfs_qm_dqdestroy(dqp);
dqp = ip->i_udquot;
xfs_dqlock(dqp);
goto dqret;
}
} else {
if (ip->i_gdquot) {
xfs_qm_dqdestroy(dqp);
dqp = ip->i_gdquot;
xfs_dqlock(dqp);
goto dqret;
}
}
}
/*
* Hashlock comes after ilock in lock order
*/
XFS_DQ_HASH_LOCK(h);
if (version != h->qh_version) {
xfs_dquot_t *tmpdqp;
/*
* Now, see if somebody else put the dquot in the
* hashtable before us. This can happen because we didn't
* keep the hashchain lock. We don't have to worry about
* lock order between the two dquots here since dqp isn't
* on any findable lists yet.
*/
if (xfs_qm_dqlookup(mp, id, h, &tmpdqp) == 0) {
/*
* Duplicate found. Just throw away the new dquot
* and start over.
*/
xfs_qm_dqput(tmpdqp);
XFS_DQ_HASH_UNLOCK(h);
xfs_qm_dqdestroy(dqp);
XQM_STATS_INC(xqmstats.xs_qm_dquot_dups);
goto again;
}
}
/*
* Put the dquot at the beginning of the hash-chain and mp's list
* LOCK ORDER: hashlock, freelistlock, mplistlock, udqlock, gdqlock ..
*/
ASSERT(XFS_DQ_IS_HASH_LOCKED(h));
dqp->q_hash = h;
XQM_HASHLIST_INSERT(h, dqp);
/*
* Attach this dquot to this filesystem's list of all dquots,
* kept inside the mount structure in m_quotainfo field
*/
xfs_qm_mplist_lock(mp);
/*
* We return a locked dquot to the caller, with a reference taken
*/
xfs_dqlock(dqp);
dqp->q_nrefs = 1;
XQM_MPLIST_INSERT(&(XFS_QI_MPL_LIST(mp)), dqp);
xfs_qm_mplist_unlock(mp);
XFS_DQ_HASH_UNLOCK(h);
dqret:
ASSERT((ip == NULL) || XFS_ISLOCKED_INODE_EXCL(ip));
xfs_dqtrace_entry(dqp, "DQGET DONE");
*O_dqpp = dqp;
return (0);
}
/*
* Release a reference to the dquot (decrement ref-count)
* and unlock it. If there is a group quota attached to this
* dquot, carefully release that too without tripping over
* deadlocks'n'stuff.
*/
void
xfs_qm_dqput(
xfs_dquot_t *dqp)
{
xfs_dquot_t *gdqp;
ASSERT(dqp->q_nrefs > 0);
ASSERT(XFS_DQ_IS_LOCKED(dqp));
xfs_dqtrace_entry(dqp, "DQPUT");
if (dqp->q_nrefs != 1) {
dqp->q_nrefs--;
xfs_dqunlock(dqp);
return;
}
/*
* drop the dqlock and acquire the freelist and dqlock
* in the right order; but try to get it out-of-order first
*/
if (! xfs_qm_freelist_lock_nowait(xfs_Gqm)) {
xfs_dqtrace_entry(dqp, "DQPUT: FLLOCK-WAIT");
xfs_dqunlock(dqp);
xfs_qm_freelist_lock(xfs_Gqm);
xfs_dqlock(dqp);
}
while (1) {
gdqp = NULL;
/* We can't depend on nrefs being == 1 here */
if (--dqp->q_nrefs == 0) {
xfs_dqtrace_entry(dqp, "DQPUT: ON FREELIST");
/*
* insert at end of the freelist.
*/
XQM_FREELIST_INSERT(&(xfs_Gqm->qm_dqfreelist), dqp);
/*
* If we just added a udquot to the freelist, then
* we want to release the gdquot reference that
* it (probably) has. Otherwise it'll keep the
* gdquot from getting reclaimed.
*/
if ((gdqp = dqp->q_gdquot)) {
/*
* Avoid a recursive dqput call
*/
xfs_dqlock(gdqp);
dqp->q_gdquot = NULL;
}
/* xfs_qm_freelist_print(&(xfs_Gqm->qm_dqfreelist),
"@@@@@++ Free list (after append) @@@@@+");
*/
}
xfs_dqunlock(dqp);
/*
* If we had a group quota inside the user quota as a hint,
* release it now.
*/
if (! gdqp)
break;
dqp = gdqp;
}
xfs_qm_freelist_unlock(xfs_Gqm);
}
/*
* Release a dquot. Flush it if dirty, then dqput() it.
* dquot must not be locked.
*/
void
xfs_qm_dqrele(
xfs_dquot_t *dqp)
{
ASSERT(dqp);
xfs_dqtrace_entry(dqp, "DQRELE");
xfs_dqlock(dqp);
/*
* We don't care to flush it if the dquot is dirty here.
* That will create stutters that we want to avoid.
* Instead we do a delayed write when we try to reclaim
* a dirty dquot. Also xfs_sync will take part of the burden...
*/
xfs_qm_dqput(dqp);
}
/*
* Write a modified dquot to disk.
* The dquot must be locked and the flush lock too taken by caller.
* The flush lock will not be unlocked until the dquot reaches the disk,
* but the dquot is free to be unlocked and modified by the caller
* in the interim. Dquot is still locked on return. This behavior is
* identical to that of inodes.
*/
int
xfs_qm_dqflush(
xfs_dquot_t *dqp,
uint flags)
{
xfs_mount_t *mp;
xfs_buf_t *bp;
xfs_disk_dquot_t *ddqp;
int error;
SPLDECL(s);
ASSERT(XFS_DQ_IS_LOCKED(dqp));
ASSERT(XFS_DQ_IS_FLUSH_LOCKED(dqp));
xfs_dqtrace_entry(dqp, "DQFLUSH");
/*
* If not dirty, nada.
*/
if (!XFS_DQ_IS_DIRTY(dqp)) {
xfs_dqfunlock(dqp);
return (0);
}
/*
* Cant flush a pinned dquot. Wait for it.
*/
xfs_qm_dqunpin_wait(dqp);
/*
* This may have been unpinned because the filesystem is shutting
* down forcibly. If that's the case we must not write this dquot
* to disk, because the log record didn't make it to disk!
*/
if (XFS_FORCED_SHUTDOWN(dqp->q_mount)) {
dqp->dq_flags &= ~(XFS_DQ_DIRTY);
xfs_dqfunlock(dqp);
return XFS_ERROR(EIO);
}
/*
* Get the buffer containing the on-disk dquot
* We don't need a transaction envelope because we know that the
* the ondisk-dquot has already been allocated for.
*/
if ((error = xfs_qm_dqtobp(NULL, dqp, &ddqp, &bp, XFS_QMOPT_DOWARN))) {
xfs_dqtrace_entry(dqp, "DQTOBP FAIL");
ASSERT(error != ENOENT);
/*
* Quotas could have gotten turned off (ESRCH)
*/
xfs_dqfunlock(dqp);
return (error);
}
if (xfs_qm_dqcheck(&dqp->q_core, INT_GET(ddqp->d_id, ARCH_CONVERT),
0, XFS_QMOPT_DOWARN, "dqflush (incore copy)")) {
xfs_force_shutdown(dqp->q_mount, XFS_CORRUPT_INCORE);
return XFS_ERROR(EIO);
}
/* This is the only portion of data that needs to persist */
memcpy(ddqp, &(dqp->q_core), sizeof(xfs_disk_dquot_t));
/*
* Clear the dirty field and remember the flush lsn for later use.
*/
dqp->dq_flags &= ~(XFS_DQ_DIRTY);
mp = dqp->q_mount;
/* lsn is 64 bits */
AIL_LOCK(mp, s);
dqp->q_logitem.qli_flush_lsn = dqp->q_logitem.qli_item.li_lsn;
AIL_UNLOCK(mp, s);
/*
* Attach an iodone routine so that we can remove this dquot from the
* AIL and release the flush lock once the dquot is synced to disk.
*/
xfs_buf_attach_iodone(bp, (void(*)(xfs_buf_t *, xfs_log_item_t *))
xfs_qm_dqflush_done, &(dqp->q_logitem.qli_item));
/*
* If the buffer is pinned then push on the log so we won't
* get stuck waiting in the write for too long.
*/
if (XFS_BUF_ISPINNED(bp)) {
xfs_dqtrace_entry(dqp, "DQFLUSH LOG FORCE");
xfs_log_force(mp, (xfs_lsn_t)0, XFS_LOG_FORCE);
}
if (flags & XFS_QMOPT_DELWRI) {
xfs_bdwrite(mp, bp);
} else if (flags & XFS_QMOPT_ASYNC) {
xfs_bawrite(mp, bp);
} else {
error = xfs_bwrite(mp, bp);
}
xfs_dqtrace_entry(dqp, "DQFLUSH END");
/*
* dqp is still locked, but caller is free to unlock it now.
*/
return (error);
}
/*
* This is the dquot flushing I/O completion routine. It is called
* from interrupt level when the buffer containing the dquot is
* flushed to disk. It is responsible for removing the dquot logitem
* from the AIL if it has not been re-logged, and unlocking the dquot's
* flush lock. This behavior is very similar to that of inodes..
*/
/*ARGSUSED*/
STATIC void
xfs_qm_dqflush_done(
xfs_buf_t *bp,
xfs_dq_logitem_t *qip)
{
xfs_dquot_t *dqp;
SPLDECL(s);
dqp = qip->qli_dquot;
/*
* We only want to pull the item from the AIL if its
* location in the log has not changed since we started the flush.
* Thus, we only bother if the dquot's lsn has
* not changed. First we check the lsn outside the lock
* since it's cheaper, and then we recheck while
* holding the lock before removing the dquot from the AIL.
*/
if ((qip->qli_item.li_flags & XFS_LI_IN_AIL) &&
qip->qli_item.li_lsn == qip->qli_flush_lsn) {
AIL_LOCK(dqp->q_mount, s);
/*
* xfs_trans_delete_ail() drops the AIL lock.
*/
if (qip->qli_item.li_lsn == qip->qli_flush_lsn)
xfs_trans_delete_ail(dqp->q_mount,
(xfs_log_item_t*)qip, s);
else
AIL_UNLOCK(dqp->q_mount, s);
}
/*
* Release the dq's flush lock since we're done with it.
*/
xfs_dqfunlock(dqp);
}
int
xfs_qm_dqflock_nowait(
xfs_dquot_t *dqp)
{
int locked;
locked = cpsema(&((dqp)->q_flock));
/* XXX ifdef these out */
if (locked)
(dqp)->dq_flags |= XFS_DQ_FLOCKED;
return (locked);
}
int
xfs_qm_dqlock_nowait(
xfs_dquot_t *dqp)
{
return (mutex_trylock(&((dqp)->q_qlock)));
}
void
xfs_dqlock(
xfs_dquot_t *dqp)
{
mutex_lock(&(dqp->q_qlock), PINOD);
}
void
xfs_dqunlock(
xfs_dquot_t *dqp)
{
mutex_unlock(&(dqp->q_qlock));
if (dqp->q_logitem.qli_dquot == dqp) {
/* Once was dqp->q_mount, but might just have been cleared */
xfs_trans_unlocked_item(dqp->q_logitem.qli_item.li_mountp,
(xfs_log_item_t*)&(dqp->q_logitem));
}
}
void
xfs_dqunlock_nonotify(
xfs_dquot_t *dqp)
{
mutex_unlock(&(dqp->q_qlock));
}
void
xfs_dqlock2(
xfs_dquot_t *d1,
xfs_dquot_t *d2)
{
if (d1 && d2) {
ASSERT(d1 != d2);
if (INT_GET(d1->q_core.d_id, ARCH_CONVERT) >
INT_GET(d2->q_core.d_id, ARCH_CONVERT)) {
xfs_dqlock(d2);
xfs_dqlock(d1);
} else {
xfs_dqlock(d1);
xfs_dqlock(d2);
}
} else {
if (d1) {
xfs_dqlock(d1);
} else if (d2) {
xfs_dqlock(d2);
}
}
}
/*
* Take a dquot out of the mount's dqlist as well as the hashlist.
* This is called via unmount as well as quotaoff, and the purge
* will always succeed unless there are soft (temp) references
* outstanding.
*
* This returns 0 if it was purged, 1 if it wasn't. It's not an error code
* that we're returning! XXXsup - not cool.
*/
/* ARGSUSED */
int
xfs_qm_dqpurge(
xfs_dquot_t *dqp,
uint flags)
{
xfs_dqhash_t *thishash;
xfs_mount_t *mp;
mp = dqp->q_mount;
ASSERT(XFS_QM_IS_MPLIST_LOCKED(mp));
ASSERT(XFS_DQ_IS_HASH_LOCKED(dqp->q_hash));
xfs_dqlock(dqp);
/*
* We really can't afford to purge a dquot that is
* referenced, because these are hard refs.
* It shouldn't happen in general because we went thru _all_ inodes in
* dqrele_all_inodes before calling this and didn't let the mountlock go.
* However it is possible that we have dquots with temporary
* references that are not attached to an inode. e.g. see xfs_setattr().
*/
if (dqp->q_nrefs != 0) {
xfs_dqunlock(dqp);
XFS_DQ_HASH_UNLOCK(dqp->q_hash);
return (1);
}
ASSERT(XFS_DQ_IS_ON_FREELIST(dqp));
/*
* If we're turning off quotas, we have to make sure that, for
* example, we don't delete quota disk blocks while dquots are
* in the process of getting written to those disk blocks.
* This dquot might well be on AIL, and we can't leave it there
* if we're turning off quotas. Basically, we need this flush
* lock, and are willing to block on it.
*/
if (! xfs_qm_dqflock_nowait(dqp)) {
/*
* Block on the flush lock after nudging dquot buffer,
* if it is incore.
*/
xfs_qm_dqflock_pushbuf_wait(dqp);
}
/*
* XXXIf we're turning this type of quotas off, we don't care
* about the dirty metadata sitting in this dquot. OTOH, if
* we're unmounting, we do care, so we flush it and wait.
*/
if (XFS_DQ_IS_DIRTY(dqp)) {
xfs_dqtrace_entry(dqp, "DQPURGE ->DQFLUSH: DQDIRTY");
/* dqflush unlocks dqflock */
/*
* Given that dqpurge is a very rare occurrence, it is OK
* that we're holding the hashlist and mplist locks
* across the disk write. But, ... XXXsup
*
* We don't care about getting disk errors here. We need
* to purge this dquot anyway, so we go ahead regardless.
*/
(void) xfs_qm_dqflush(dqp, XFS_QMOPT_SYNC);
xfs_dqflock(dqp);
}
ASSERT(dqp->q_pincount == 0);
ASSERT(XFS_FORCED_SHUTDOWN(mp) ||
!(dqp->q_logitem.qli_item.li_flags & XFS_LI_IN_AIL));
thishash = dqp->q_hash;
XQM_HASHLIST_REMOVE(thishash, dqp);
XQM_MPLIST_REMOVE(&(XFS_QI_MPL_LIST(mp)), dqp);
/*
* XXX Move this to the front of the freelist, if we can get the
* freelist lock.
*/
ASSERT(XFS_DQ_IS_ON_FREELIST(dqp));
dqp->q_mount = NULL;
dqp->q_hash = NULL;
dqp->dq_flags = XFS_DQ_INACTIVE;
memset(&dqp->q_core, 0, sizeof(dqp->q_core));
xfs_dqfunlock(dqp);
xfs_dqunlock(dqp);
XFS_DQ_HASH_UNLOCK(thishash);
return (0);
}
#ifdef QUOTADEBUG
void
xfs_qm_dqprint(xfs_dquot_t *dqp)
{
cmn_err(CE_DEBUG, "-----------KERNEL DQUOT----------------");
cmn_err(CE_DEBUG, "---- dquotID = %d",
(int)INT_GET(dqp->q_core.d_id, ARCH_CONVERT));
cmn_err(CE_DEBUG, "---- type = %s", DQFLAGTO_TYPESTR(dqp));
cmn_err(CE_DEBUG, "---- fs = 0x%p", dqp->q_mount);
cmn_err(CE_DEBUG, "---- blkno = 0x%x", (int) dqp->q_blkno);
cmn_err(CE_DEBUG, "---- boffset = 0x%x", (int) dqp->q_bufoffset);
cmn_err(CE_DEBUG, "---- blkhlimit = %Lu (0x%x)",
INT_GET(dqp->q_core.d_blk_hardlimit, ARCH_CONVERT),
(int) INT_GET(dqp->q_core.d_blk_hardlimit, ARCH_CONVERT));
cmn_err(CE_DEBUG, "---- blkslimit = %Lu (0x%x)",
INT_GET(dqp->q_core.d_blk_softlimit, ARCH_CONVERT),
(int)INT_GET(dqp->q_core.d_blk_softlimit, ARCH_CONVERT));
cmn_err(CE_DEBUG, "---- inohlimit = %Lu (0x%x)",
INT_GET(dqp->q_core.d_ino_hardlimit, ARCH_CONVERT),
(int)INT_GET(dqp->q_core.d_ino_hardlimit, ARCH_CONVERT));
cmn_err(CE_DEBUG, "---- inoslimit = %Lu (0x%x)",
INT_GET(dqp->q_core.d_ino_softlimit, ARCH_CONVERT),
(int)INT_GET(dqp->q_core.d_ino_softlimit, ARCH_CONVERT));
cmn_err(CE_DEBUG, "---- bcount = %Lu (0x%x)",
INT_GET(dqp->q_core.d_bcount, ARCH_CONVERT),
(int)INT_GET(dqp->q_core.d_bcount, ARCH_CONVERT));
cmn_err(CE_DEBUG, "---- icount = %Lu (0x%x)",
INT_GET(dqp->q_core.d_icount, ARCH_CONVERT),
(int)INT_GET(dqp->q_core.d_icount, ARCH_CONVERT));
cmn_err(CE_DEBUG, "---- btimer = %d",
(int)INT_GET(dqp->q_core.d_btimer, ARCH_CONVERT));
cmn_err(CE_DEBUG, "---- itimer = %d",
(int)INT_GET(dqp->q_core.d_itimer, ARCH_CONVERT));
cmn_err(CE_DEBUG, "---------------------------");
}
#endif
/*
* Give the buffer a little push if it is incore and
* wait on the flush lock.
*/
void
xfs_qm_dqflock_pushbuf_wait(
xfs_dquot_t *dqp)
{
xfs_buf_t *bp;
/*
* Check to see if the dquot has been flushed delayed
* write. If so, grab its buffer and send it
* out immediately. We'll be able to acquire
* the flush lock when the I/O completes.
*/
bp = xfs_incore(dqp->q_mount->m_ddev_targp, dqp->q_blkno,
XFS_QI_DQCHUNKLEN(dqp->q_mount),
XFS_INCORE_TRYLOCK);
if (bp != NULL) {
if (XFS_BUF_ISDELAYWRITE(bp)) {
if (XFS_BUF_ISPINNED(bp)) {
xfs_log_force(dqp->q_mount,
(xfs_lsn_t)0,
XFS_LOG_FORCE);
}
xfs_bawrite(dqp->q_mount, bp);
} else {
xfs_buf_relse(bp);
}
}
xfs_dqflock(dqp);
}