Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.
Let it rip!
diff --git a/fs/xfs/quota/xfs_dquot.c b/fs/xfs/quota/xfs_dquot.c
new file mode 100644
index 0000000..740d20d
--- /dev/null
+++ b/fs/xfs/quota/xfs_dquot.c
@@ -0,0 +1,1648 @@
+/*
+ * 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.
+ */
+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.
+ */
+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 {
+ 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 {
+ 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 {
+ 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;
+ }
+ }
+}
+
+/*
+ * Increment or reset warnings of a given dquot.
+ */
+int
+xfs_qm_dqwarn(
+ xfs_disk_dquot_t *d,
+ uint flags)
+{
+ int warned;
+
+ /*
+ * root's limits are not real limits.
+ */
+ if (!d->d_id)
+ return (0);
+
+ warned = 0;
+ if (INT_GET(d->d_blk_softlimit, ARCH_CONVERT) &&
+ (INT_GET(d->d_bcount, ARCH_CONVERT) >=
+ INT_GET(d->d_blk_softlimit, ARCH_CONVERT))) {
+ if (flags & XFS_QMOPT_DOWARN) {
+ INT_MOD(d->d_bwarns, ARCH_CONVERT, +1);
+ warned++;
+ }
+ } else {
+ if (!d->d_blk_softlimit ||
+ (INT_GET(d->d_bcount, ARCH_CONVERT) <
+ INT_GET(d->d_blk_softlimit, ARCH_CONVERT))) {
+ d->d_bwarns = 0;
+ }
+ }
+
+ if (INT_GET(d->d_ino_softlimit, ARCH_CONVERT) > 0 &&
+ (INT_GET(d->d_icount, ARCH_CONVERT) >=
+ INT_GET(d->d_ino_softlimit, ARCH_CONVERT))) {
+ if (flags & XFS_QMOPT_DOWARN) {
+ INT_MOD(d->d_iwarns, ARCH_CONVERT, +1);
+ warned++;
+ }
+ } else {
+ if (!d->d_ino_softlimit ||
+ (INT_GET(d->d_icount, ARCH_CONVERT) <
+ INT_GET(d->d_ino_softlimit, ARCH_CONVERT))) {
+ d->d_iwarns = 0;
+ }
+ }
+#ifdef QUOTADEBUG
+ if (INT_GET(d->d_iwarns, ARCH_CONVERT))
+ cmn_err(CE_DEBUG,
+ "--------@@Inode warnings running : %Lu >= %Lu",
+ INT_GET(d->d_icount, ARCH_CONVERT),
+ INT_GET(d->d_ino_softlimit, ARCH_CONVERT));
+ if (INT_GET(d->d_bwarns, ARCH_CONVERT))
+ cmn_err(CE_DEBUG,
+ "--------@@Blks warnings running : %Lu >= %Lu",
+ INT_GET(d->d_bcount, ARCH_CONVERT),
+ INT_GET(d->d_blk_softlimit, ARCH_CONVERT));
+#endif
+ return (warned);
+}
+
+
+/*
+ * 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 :
+ 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 *tp,
+ 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;
+
+ 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_USER|XFS_DQ_GROUP),
+ bp);
+
+ if ((error = xfs_bmap_finish(&tp, &flist, firstblock, &committed))) {
+ goto error1;
+ }
+
+ *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 *tp,
+ 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;
+
+ 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(tp, mp, dqp, quotip,
+ dqp->q_fileoffset, &bp)))
+ return (error);
+ 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_USER|XFS_DQ_GROUP),
+ 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 *tp,
+ 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;
+
+ /*
+ * 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(tp, dqp, &ddqp, &bp, flags))) {
+ return (error);
+ }
+
+ /* 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, /* gid or uid, depending on type */
+ uint type, /* UDQUOT or GDQUOT */
+ 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_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_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",
+ XFS_QM_ISUDQ(dqp) ? "USR" : "GRP");
+ 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);
+}
