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bb58e6188a
More on-disk format consolidation. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Dave Chinner <dchinner@redhat.com> Signed-off-by: Dave Chinner <david@fromorbit.com>
1105 lines
28 KiB
C
1105 lines
28 KiB
C
/*
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* Copyright (c) 2000-2003 Silicon Graphics, Inc.
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* All Rights Reserved.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it would be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "xfs.h"
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#include "xfs_fs.h"
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#include "xfs_format.h"
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#include "xfs_log_format.h"
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#include "xfs_shared.h"
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#include "xfs_trans_resv.h"
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#include "xfs_bit.h"
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#include "xfs_mount.h"
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#include "xfs_inode.h"
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#include "xfs_bmap.h"
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#include "xfs_bmap_util.h"
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#include "xfs_alloc.h"
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#include "xfs_quota.h"
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#include "xfs_error.h"
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#include "xfs_trans.h"
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#include "xfs_buf_item.h"
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#include "xfs_trans_space.h"
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#include "xfs_trans_priv.h"
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#include "xfs_qm.h"
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#include "xfs_cksum.h"
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#include "xfs_trace.h"
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#include "xfs_log.h"
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#include "xfs_bmap_btree.h"
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/*
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* Lock order:
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*
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* ip->i_lock
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* qi->qi_tree_lock
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* dquot->q_qlock (xfs_dqlock() and friends)
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* dquot->q_flush (xfs_dqflock() and friends)
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* qi->qi_lru_lock
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*
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* If two dquots need to be locked the order is user before group/project,
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* otherwise by the lowest id first, see xfs_dqlock2.
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*/
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#ifdef DEBUG
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xfs_buftarg_t *xfs_dqerror_target;
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int xfs_do_dqerror;
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int xfs_dqreq_num;
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int xfs_dqerror_mod = 33;
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#endif
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struct kmem_zone *xfs_qm_dqtrxzone;
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static struct kmem_zone *xfs_qm_dqzone;
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static struct lock_class_key xfs_dquot_group_class;
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static struct lock_class_key xfs_dquot_project_class;
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/*
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* This is called to free all the memory associated with a dquot
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*/
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void
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xfs_qm_dqdestroy(
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xfs_dquot_t *dqp)
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{
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ASSERT(list_empty(&dqp->q_lru));
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mutex_destroy(&dqp->q_qlock);
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kmem_zone_free(xfs_qm_dqzone, dqp);
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XFS_STATS_DEC(xs_qm_dquot);
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}
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/*
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* If default limits are in force, push them into the dquot now.
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* We overwrite the dquot limits only if they are zero and this
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* is not the root dquot.
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*/
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void
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xfs_qm_adjust_dqlimits(
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struct xfs_mount *mp,
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struct xfs_dquot *dq)
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{
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struct xfs_quotainfo *q = mp->m_quotainfo;
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struct xfs_disk_dquot *d = &dq->q_core;
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int prealloc = 0;
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ASSERT(d->d_id);
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if (q->qi_bsoftlimit && !d->d_blk_softlimit) {
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d->d_blk_softlimit = cpu_to_be64(q->qi_bsoftlimit);
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prealloc = 1;
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}
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if (q->qi_bhardlimit && !d->d_blk_hardlimit) {
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d->d_blk_hardlimit = cpu_to_be64(q->qi_bhardlimit);
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prealloc = 1;
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}
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if (q->qi_isoftlimit && !d->d_ino_softlimit)
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d->d_ino_softlimit = cpu_to_be64(q->qi_isoftlimit);
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if (q->qi_ihardlimit && !d->d_ino_hardlimit)
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d->d_ino_hardlimit = cpu_to_be64(q->qi_ihardlimit);
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if (q->qi_rtbsoftlimit && !d->d_rtb_softlimit)
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d->d_rtb_softlimit = cpu_to_be64(q->qi_rtbsoftlimit);
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if (q->qi_rtbhardlimit && !d->d_rtb_hardlimit)
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d->d_rtb_hardlimit = cpu_to_be64(q->qi_rtbhardlimit);
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if (prealloc)
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xfs_dquot_set_prealloc_limits(dq);
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}
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/*
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* Check the limits and timers of a dquot and start or reset timers
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* if necessary.
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* This gets called even when quota enforcement is OFF, which makes our
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* life a little less complicated. (We just don't reject any quota
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* reservations in that case, when enforcement is off).
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* We also return 0 as the values of the timers in Q_GETQUOTA calls, when
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* enforcement's off.
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* In contrast, warnings are a little different in that they don't
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* 'automatically' get started when limits get exceeded. They do
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* get reset to zero, however, when we find the count to be under
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* the soft limit (they are only ever set non-zero via userspace).
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*/
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void
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xfs_qm_adjust_dqtimers(
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xfs_mount_t *mp,
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xfs_disk_dquot_t *d)
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{
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ASSERT(d->d_id);
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#ifdef DEBUG
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if (d->d_blk_hardlimit)
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ASSERT(be64_to_cpu(d->d_blk_softlimit) <=
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be64_to_cpu(d->d_blk_hardlimit));
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if (d->d_ino_hardlimit)
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ASSERT(be64_to_cpu(d->d_ino_softlimit) <=
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be64_to_cpu(d->d_ino_hardlimit));
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if (d->d_rtb_hardlimit)
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ASSERT(be64_to_cpu(d->d_rtb_softlimit) <=
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be64_to_cpu(d->d_rtb_hardlimit));
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#endif
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if (!d->d_btimer) {
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if ((d->d_blk_softlimit &&
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(be64_to_cpu(d->d_bcount) >
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be64_to_cpu(d->d_blk_softlimit))) ||
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(d->d_blk_hardlimit &&
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(be64_to_cpu(d->d_bcount) >
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be64_to_cpu(d->d_blk_hardlimit)))) {
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d->d_btimer = cpu_to_be32(get_seconds() +
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mp->m_quotainfo->qi_btimelimit);
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} else {
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d->d_bwarns = 0;
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}
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} else {
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if ((!d->d_blk_softlimit ||
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(be64_to_cpu(d->d_bcount) <=
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be64_to_cpu(d->d_blk_softlimit))) &&
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(!d->d_blk_hardlimit ||
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(be64_to_cpu(d->d_bcount) <=
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be64_to_cpu(d->d_blk_hardlimit)))) {
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d->d_btimer = 0;
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}
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}
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if (!d->d_itimer) {
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if ((d->d_ino_softlimit &&
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(be64_to_cpu(d->d_icount) >
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be64_to_cpu(d->d_ino_softlimit))) ||
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(d->d_ino_hardlimit &&
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(be64_to_cpu(d->d_icount) >
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be64_to_cpu(d->d_ino_hardlimit)))) {
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d->d_itimer = cpu_to_be32(get_seconds() +
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mp->m_quotainfo->qi_itimelimit);
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} else {
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d->d_iwarns = 0;
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}
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} else {
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if ((!d->d_ino_softlimit ||
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(be64_to_cpu(d->d_icount) <=
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be64_to_cpu(d->d_ino_softlimit))) &&
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(!d->d_ino_hardlimit ||
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(be64_to_cpu(d->d_icount) <=
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be64_to_cpu(d->d_ino_hardlimit)))) {
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d->d_itimer = 0;
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}
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}
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if (!d->d_rtbtimer) {
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if ((d->d_rtb_softlimit &&
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(be64_to_cpu(d->d_rtbcount) >
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be64_to_cpu(d->d_rtb_softlimit))) ||
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(d->d_rtb_hardlimit &&
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(be64_to_cpu(d->d_rtbcount) >
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be64_to_cpu(d->d_rtb_hardlimit)))) {
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d->d_rtbtimer = cpu_to_be32(get_seconds() +
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mp->m_quotainfo->qi_rtbtimelimit);
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} else {
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d->d_rtbwarns = 0;
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}
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} else {
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if ((!d->d_rtb_softlimit ||
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(be64_to_cpu(d->d_rtbcount) <=
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be64_to_cpu(d->d_rtb_softlimit))) &&
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(!d->d_rtb_hardlimit ||
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(be64_to_cpu(d->d_rtbcount) <=
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be64_to_cpu(d->d_rtb_hardlimit)))) {
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d->d_rtbtimer = 0;
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}
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}
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}
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/*
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* initialize a buffer full of dquots and log the whole thing
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*/
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STATIC void
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xfs_qm_init_dquot_blk(
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xfs_trans_t *tp,
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xfs_mount_t *mp,
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xfs_dqid_t id,
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uint type,
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xfs_buf_t *bp)
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{
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struct xfs_quotainfo *q = mp->m_quotainfo;
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xfs_dqblk_t *d;
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int curid, i;
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ASSERT(tp);
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ASSERT(xfs_buf_islocked(bp));
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d = bp->b_addr;
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/*
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* ID of the first dquot in the block - id's are zero based.
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*/
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curid = id - (id % q->qi_dqperchunk);
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ASSERT(curid >= 0);
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memset(d, 0, BBTOB(q->qi_dqchunklen));
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for (i = 0; i < q->qi_dqperchunk; i++, d++, curid++) {
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d->dd_diskdq.d_magic = cpu_to_be16(XFS_DQUOT_MAGIC);
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d->dd_diskdq.d_version = XFS_DQUOT_VERSION;
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d->dd_diskdq.d_id = cpu_to_be32(curid);
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d->dd_diskdq.d_flags = type;
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if (xfs_sb_version_hascrc(&mp->m_sb)) {
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uuid_copy(&d->dd_uuid, &mp->m_sb.sb_uuid);
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xfs_update_cksum((char *)d, sizeof(struct xfs_dqblk),
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XFS_DQUOT_CRC_OFF);
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}
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}
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xfs_trans_dquot_buf(tp, bp,
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(type & XFS_DQ_USER ? XFS_BLF_UDQUOT_BUF :
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((type & XFS_DQ_PROJ) ? XFS_BLF_PDQUOT_BUF :
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XFS_BLF_GDQUOT_BUF)));
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xfs_trans_log_buf(tp, bp, 0, BBTOB(q->qi_dqchunklen) - 1);
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}
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/*
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* Initialize the dynamic speculative preallocation thresholds. The lo/hi
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* watermarks correspond to the soft and hard limits by default. If a soft limit
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* is not specified, we use 95% of the hard limit.
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*/
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void
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xfs_dquot_set_prealloc_limits(struct xfs_dquot *dqp)
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{
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__uint64_t space;
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dqp->q_prealloc_hi_wmark = be64_to_cpu(dqp->q_core.d_blk_hardlimit);
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dqp->q_prealloc_lo_wmark = be64_to_cpu(dqp->q_core.d_blk_softlimit);
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if (!dqp->q_prealloc_lo_wmark) {
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dqp->q_prealloc_lo_wmark = dqp->q_prealloc_hi_wmark;
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do_div(dqp->q_prealloc_lo_wmark, 100);
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dqp->q_prealloc_lo_wmark *= 95;
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}
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space = dqp->q_prealloc_hi_wmark;
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do_div(space, 100);
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dqp->q_low_space[XFS_QLOWSP_1_PCNT] = space;
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dqp->q_low_space[XFS_QLOWSP_3_PCNT] = space * 3;
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dqp->q_low_space[XFS_QLOWSP_5_PCNT] = space * 5;
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}
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/*
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* Allocate a block and fill it with dquots.
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* This is called when the bmapi finds a hole.
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*/
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STATIC int
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xfs_qm_dqalloc(
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xfs_trans_t **tpp,
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xfs_mount_t *mp,
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xfs_dquot_t *dqp,
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xfs_inode_t *quotip,
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xfs_fileoff_t offset_fsb,
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xfs_buf_t **O_bpp)
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{
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xfs_fsblock_t firstblock;
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xfs_bmap_free_t flist;
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xfs_bmbt_irec_t map;
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int nmaps, error, committed;
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xfs_buf_t *bp;
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xfs_trans_t *tp = *tpp;
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ASSERT(tp != NULL);
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trace_xfs_dqalloc(dqp);
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/*
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* Initialize the bmap freelist prior to calling bmapi code.
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*/
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xfs_bmap_init(&flist, &firstblock);
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xfs_ilock(quotip, XFS_ILOCK_EXCL);
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/*
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* Return if this type of quotas is turned off while we didn't
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* have an inode lock
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*/
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if (!xfs_this_quota_on(dqp->q_mount, dqp->dq_flags)) {
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xfs_iunlock(quotip, XFS_ILOCK_EXCL);
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return -ESRCH;
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}
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xfs_trans_ijoin(tp, quotip, XFS_ILOCK_EXCL);
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nmaps = 1;
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error = xfs_bmapi_write(tp, quotip, offset_fsb,
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XFS_DQUOT_CLUSTER_SIZE_FSB, XFS_BMAPI_METADATA,
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&firstblock, XFS_QM_DQALLOC_SPACE_RES(mp),
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&map, &nmaps, &flist);
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if (error)
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goto error0;
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ASSERT(map.br_blockcount == XFS_DQUOT_CLUSTER_SIZE_FSB);
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ASSERT(nmaps == 1);
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ASSERT((map.br_startblock != DELAYSTARTBLOCK) &&
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(map.br_startblock != HOLESTARTBLOCK));
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/*
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* Keep track of the blkno to save a lookup later
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*/
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dqp->q_blkno = XFS_FSB_TO_DADDR(mp, map.br_startblock);
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/* now we can just get the buffer (there's nothing to read yet) */
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bp = xfs_trans_get_buf(tp, mp->m_ddev_targp,
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dqp->q_blkno,
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mp->m_quotainfo->qi_dqchunklen,
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0);
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if (!bp) {
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error = -ENOMEM;
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goto error1;
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}
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bp->b_ops = &xfs_dquot_buf_ops;
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/*
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* Make a chunk of dquots out of this buffer and log
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* the entire thing.
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*/
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xfs_qm_init_dquot_blk(tp, mp, be32_to_cpu(dqp->q_core.d_id),
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dqp->dq_flags & XFS_DQ_ALLTYPES, bp);
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|
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/*
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* xfs_bmap_finish() may commit the current transaction and
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* start a second transaction if the freelist is not empty.
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*
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* Since we still want to modify this buffer, we need to
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* ensure that the buffer is not released on commit of
|
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* the first transaction and ensure the buffer is added to the
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* second transaction.
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*
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* If there is only one transaction then don't stop the buffer
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* from being released when it commits later on.
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*/
|
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xfs_trans_bhold(tp, bp);
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if ((error = xfs_bmap_finish(tpp, &flist, &committed))) {
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goto error1;
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}
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if (committed) {
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tp = *tpp;
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xfs_trans_bjoin(tp, bp);
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} else {
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xfs_trans_bhold_release(tp, bp);
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}
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*O_bpp = bp;
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return 0;
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error1:
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xfs_bmap_cancel(&flist);
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error0:
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xfs_iunlock(quotip, XFS_ILOCK_EXCL);
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return error;
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}
|
|
|
|
STATIC int
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|
xfs_qm_dqrepair(
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struct xfs_mount *mp,
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struct xfs_trans *tp,
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struct xfs_dquot *dqp,
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xfs_dqid_t firstid,
|
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struct xfs_buf **bpp)
|
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{
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int error;
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struct xfs_disk_dquot *ddq;
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struct xfs_dqblk *d;
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int i;
|
|
|
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/*
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* Read the buffer without verification so we get the corrupted
|
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* buffer returned to us. make sure we verify it on write, though.
|
|
*/
|
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error = xfs_trans_read_buf(mp, tp, mp->m_ddev_targp, dqp->q_blkno,
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mp->m_quotainfo->qi_dqchunklen,
|
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0, bpp, NULL);
|
|
|
|
if (error) {
|
|
ASSERT(*bpp == NULL);
|
|
return error;
|
|
}
|
|
(*bpp)->b_ops = &xfs_dquot_buf_ops;
|
|
|
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ASSERT(xfs_buf_islocked(*bpp));
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|
d = (struct xfs_dqblk *)(*bpp)->b_addr;
|
|
|
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/* Do the actual repair of dquots in this buffer */
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for (i = 0; i < mp->m_quotainfo->qi_dqperchunk; i++) {
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ddq = &d[i].dd_diskdq;
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error = xfs_dqcheck(mp, ddq, firstid + i,
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dqp->dq_flags & XFS_DQ_ALLTYPES,
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XFS_QMOPT_DQREPAIR, "xfs_qm_dqrepair");
|
|
if (error) {
|
|
/* repair failed, we're screwed */
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xfs_trans_brelse(tp, *bpp);
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|
return -EIO;
|
|
}
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}
|
|
|
|
return 0;
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|
}
|
|
|
|
/*
|
|
* 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)
|
|
{
|
|
struct xfs_bmbt_irec map;
|
|
int nmaps = 1, error;
|
|
struct xfs_buf *bp;
|
|
struct xfs_inode *quotip = xfs_dq_to_quota_inode(dqp);
|
|
struct xfs_mount *mp = dqp->q_mount;
|
|
xfs_dqid_t id = be32_to_cpu(dqp->q_core.d_id);
|
|
struct xfs_trans *tp = (tpp ? *tpp : NULL);
|
|
uint lock_mode;
|
|
|
|
dqp->q_fileoffset = (xfs_fileoff_t)id / mp->m_quotainfo->qi_dqperchunk;
|
|
|
|
lock_mode = xfs_ilock_data_map_shared(quotip);
|
|
if (!xfs_this_quota_on(dqp->q_mount, dqp->dq_flags)) {
|
|
/*
|
|
* Return if this type of quotas is turned off while we
|
|
* didn't have the quota inode lock.
|
|
*/
|
|
xfs_iunlock(quotip, lock_mode);
|
|
return -ESRCH;
|
|
}
|
|
|
|
/*
|
|
* Find the block map; no allocations yet
|
|
*/
|
|
error = xfs_bmapi_read(quotip, dqp->q_fileoffset,
|
|
XFS_DQUOT_CLUSTER_SIZE_FSB, &map, &nmaps, 0);
|
|
|
|
xfs_iunlock(quotip, lock_mode);
|
|
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 % mp->m_quotainfo->qi_dqperchunk) *
|
|
sizeof(xfs_dqblk_t);
|
|
|
|
ASSERT(map.br_startblock != DELAYSTARTBLOCK);
|
|
if (map.br_startblock == HOLESTARTBLOCK) {
|
|
/*
|
|
* We don't allocate unless we're asked to
|
|
*/
|
|
if (!(flags & XFS_QMOPT_DQALLOC))
|
|
return -ENOENT;
|
|
|
|
ASSERT(tp);
|
|
error = xfs_qm_dqalloc(tpp, mp, dqp, quotip,
|
|
dqp->q_fileoffset, &bp);
|
|
if (error)
|
|
return error;
|
|
tp = *tpp;
|
|
} else {
|
|
trace_xfs_dqtobp_read(dqp);
|
|
|
|
/*
|
|
* 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);
|
|
|
|
error = xfs_trans_read_buf(mp, tp, mp->m_ddev_targp,
|
|
dqp->q_blkno,
|
|
mp->m_quotainfo->qi_dqchunklen,
|
|
0, &bp, &xfs_dquot_buf_ops);
|
|
|
|
if (error == -EFSCORRUPTED && (flags & XFS_QMOPT_DQREPAIR)) {
|
|
xfs_dqid_t firstid = (xfs_dqid_t)map.br_startoff *
|
|
mp->m_quotainfo->qi_dqperchunk;
|
|
ASSERT(bp == NULL);
|
|
error = xfs_qm_dqrepair(mp, tp, dqp, firstid, &bp);
|
|
}
|
|
|
|
if (error) {
|
|
ASSERT(bp == NULL);
|
|
return error;
|
|
}
|
|
}
|
|
|
|
ASSERT(xfs_buf_islocked(bp));
|
|
*O_bpp = bp;
|
|
*O_ddpp = bp->b_addr + dqp->q_bufoffset;
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
/*
|
|
* Read in the ondisk dquot using dqtobp() then copy it to an incore version,
|
|
* and release the buffer immediately.
|
|
*
|
|
* If XFS_QMOPT_DQALLOC is set, allocate a dquot on disk if it needed.
|
|
*/
|
|
int
|
|
xfs_qm_dqread(
|
|
struct xfs_mount *mp,
|
|
xfs_dqid_t id,
|
|
uint type,
|
|
uint flags,
|
|
struct xfs_dquot **O_dqpp)
|
|
{
|
|
struct xfs_dquot *dqp;
|
|
struct xfs_disk_dquot *ddqp;
|
|
struct xfs_buf *bp;
|
|
struct xfs_trans *tp = NULL;
|
|
int error;
|
|
int cancelflags = 0;
|
|
|
|
|
|
dqp = kmem_zone_zalloc(xfs_qm_dqzone, KM_SLEEP);
|
|
|
|
dqp->dq_flags = type;
|
|
dqp->q_core.d_id = cpu_to_be32(id);
|
|
dqp->q_mount = mp;
|
|
INIT_LIST_HEAD(&dqp->q_lru);
|
|
mutex_init(&dqp->q_qlock);
|
|
init_waitqueue_head(&dqp->q_pinwait);
|
|
|
|
/*
|
|
* Because we want to use a counting completion, complete
|
|
* the flush completion once to allow a single access to
|
|
* the flush completion without blocking.
|
|
*/
|
|
init_completion(&dqp->q_flush);
|
|
complete(&dqp->q_flush);
|
|
|
|
/*
|
|
* Make sure group quotas have a different lock class than user
|
|
* quotas.
|
|
*/
|
|
switch (type) {
|
|
case XFS_DQ_USER:
|
|
/* uses the default lock class */
|
|
break;
|
|
case XFS_DQ_GROUP:
|
|
lockdep_set_class(&dqp->q_qlock, &xfs_dquot_group_class);
|
|
break;
|
|
case XFS_DQ_PROJ:
|
|
lockdep_set_class(&dqp->q_qlock, &xfs_dquot_project_class);
|
|
break;
|
|
default:
|
|
ASSERT(0);
|
|
break;
|
|
}
|
|
|
|
XFS_STATS_INC(xs_qm_dquot);
|
|
|
|
trace_xfs_dqread(dqp);
|
|
|
|
if (flags & XFS_QMOPT_DQALLOC) {
|
|
tp = xfs_trans_alloc(mp, XFS_TRANS_QM_DQALLOC);
|
|
error = xfs_trans_reserve(tp, &M_RES(mp)->tr_qm_dqalloc,
|
|
XFS_QM_DQALLOC_SPACE_RES(mp), 0);
|
|
if (error)
|
|
goto error1;
|
|
cancelflags = XFS_TRANS_RELEASE_LOG_RES;
|
|
}
|
|
|
|
/*
|
|
* get a pointer to the on-disk dquot and the buffer containing it
|
|
* dqp already knows its own type (GROUP/USER).
|
|
*/
|
|
error = xfs_qm_dqtobp(&tp, dqp, &ddqp, &bp, flags);
|
|
if (error) {
|
|
/*
|
|
* This can happen if quotas got turned off (ESRCH),
|
|
* or if the dquot didn't exist on disk and we ask to
|
|
* allocate (ENOENT).
|
|
*/
|
|
trace_xfs_dqread_fail(dqp);
|
|
cancelflags |= XFS_TRANS_ABORT;
|
|
goto error1;
|
|
}
|
|
|
|
/* copy everything from disk dquot to the incore dquot */
|
|
memcpy(&dqp->q_core, ddqp, sizeof(xfs_disk_dquot_t));
|
|
xfs_qm_dquot_logitem_init(dqp);
|
|
|
|
/*
|
|
* Reservation counters are defined as reservation plus current usage
|
|
* to avoid having to add every time.
|
|
*/
|
|
dqp->q_res_bcount = be64_to_cpu(ddqp->d_bcount);
|
|
dqp->q_res_icount = be64_to_cpu(ddqp->d_icount);
|
|
dqp->q_res_rtbcount = be64_to_cpu(ddqp->d_rtbcount);
|
|
|
|
/* initialize the dquot speculative prealloc thresholds */
|
|
xfs_dquot_set_prealloc_limits(dqp);
|
|
|
|
/* Mark the buf so that this will stay incore a little longer */
|
|
xfs_buf_set_ref(bp, 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_islocked(bp));
|
|
xfs_trans_brelse(tp, bp);
|
|
|
|
if (tp) {
|
|
error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES);
|
|
if (error)
|
|
goto error0;
|
|
}
|
|
|
|
*O_dqpp = dqp;
|
|
return error;
|
|
|
|
error1:
|
|
if (tp)
|
|
xfs_trans_cancel(tp, cancelflags);
|
|
error0:
|
|
xfs_qm_dqdestroy(dqp);
|
|
*O_dqpp = NULL;
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* 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 */
|
|
{
|
|
struct xfs_quotainfo *qi = mp->m_quotainfo;
|
|
struct radix_tree_root *tree = xfs_dquot_tree(qi, type);
|
|
struct xfs_dquot *dqp;
|
|
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;
|
|
}
|
|
|
|
#ifdef DEBUG
|
|
if (xfs_do_dqerror) {
|
|
if ((xfs_dqerror_target == mp->m_ddev_targp) &&
|
|
(xfs_dqreq_num++ % xfs_dqerror_mod) == 0) {
|
|
xfs_debug(mp, "Returning error in dqget");
|
|
return -EIO;
|
|
}
|
|
}
|
|
|
|
ASSERT(type == XFS_DQ_USER ||
|
|
type == XFS_DQ_PROJ ||
|
|
type == XFS_DQ_GROUP);
|
|
if (ip) {
|
|
ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
|
|
ASSERT(xfs_inode_dquot(ip, type) == NULL);
|
|
}
|
|
#endif
|
|
|
|
restart:
|
|
mutex_lock(&qi->qi_tree_lock);
|
|
dqp = radix_tree_lookup(tree, id);
|
|
if (dqp) {
|
|
xfs_dqlock(dqp);
|
|
if (dqp->dq_flags & XFS_DQ_FREEING) {
|
|
xfs_dqunlock(dqp);
|
|
mutex_unlock(&qi->qi_tree_lock);
|
|
trace_xfs_dqget_freeing(dqp);
|
|
delay(1);
|
|
goto restart;
|
|
}
|
|
|
|
dqp->q_nrefs++;
|
|
mutex_unlock(&qi->qi_tree_lock);
|
|
|
|
trace_xfs_dqget_hit(dqp);
|
|
XFS_STATS_INC(xs_qm_dqcachehits);
|
|
*O_dqpp = dqp;
|
|
return 0;
|
|
}
|
|
mutex_unlock(&qi->qi_tree_lock);
|
|
XFS_STATS_INC(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);
|
|
|
|
error = xfs_qm_dqread(mp, id, type, flags, &dqp);
|
|
|
|
if (ip)
|
|
xfs_ilock(ip, XFS_ILOCK_EXCL);
|
|
|
|
if (error)
|
|
return error;
|
|
|
|
if (ip) {
|
|
/*
|
|
* A dquot could be attached to this inode by now, since
|
|
* we had dropped the ilock.
|
|
*/
|
|
if (xfs_this_quota_on(mp, type)) {
|
|
struct xfs_dquot *dqp1;
|
|
|
|
dqp1 = xfs_inode_dquot(ip, type);
|
|
if (dqp1) {
|
|
xfs_qm_dqdestroy(dqp);
|
|
dqp = dqp1;
|
|
xfs_dqlock(dqp);
|
|
goto dqret;
|
|
}
|
|
} else {
|
|
/* inode stays locked on return */
|
|
xfs_qm_dqdestroy(dqp);
|
|
return -ESRCH;
|
|
}
|
|
}
|
|
|
|
mutex_lock(&qi->qi_tree_lock);
|
|
error = radix_tree_insert(tree, id, dqp);
|
|
if (unlikely(error)) {
|
|
WARN_ON(error != -EEXIST);
|
|
|
|
/*
|
|
* Duplicate found. Just throw away the new dquot and start
|
|
* over.
|
|
*/
|
|
mutex_unlock(&qi->qi_tree_lock);
|
|
trace_xfs_dqget_dup(dqp);
|
|
xfs_qm_dqdestroy(dqp);
|
|
XFS_STATS_INC(xs_qm_dquot_dups);
|
|
goto restart;
|
|
}
|
|
|
|
/*
|
|
* We return a locked dquot to the caller, with a reference taken
|
|
*/
|
|
xfs_dqlock(dqp);
|
|
dqp->q_nrefs = 1;
|
|
|
|
qi->qi_dquots++;
|
|
mutex_unlock(&qi->qi_tree_lock);
|
|
|
|
dqret:
|
|
ASSERT((ip == NULL) || xfs_isilocked(ip, XFS_ILOCK_EXCL));
|
|
trace_xfs_dqget_miss(dqp);
|
|
*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(
|
|
struct xfs_dquot *dqp)
|
|
{
|
|
ASSERT(dqp->q_nrefs > 0);
|
|
ASSERT(XFS_DQ_IS_LOCKED(dqp));
|
|
|
|
trace_xfs_dqput(dqp);
|
|
|
|
if (--dqp->q_nrefs == 0) {
|
|
struct xfs_quotainfo *qi = dqp->q_mount->m_quotainfo;
|
|
trace_xfs_dqput_free(dqp);
|
|
|
|
if (list_lru_add(&qi->qi_lru, &dqp->q_lru))
|
|
XFS_STATS_INC(xs_qm_dquot_unused);
|
|
}
|
|
xfs_dqunlock(dqp);
|
|
}
|
|
|
|
/*
|
|
* Release a dquot. Flush it if dirty, then dqput() it.
|
|
* dquot must not be locked.
|
|
*/
|
|
void
|
|
xfs_qm_dqrele(
|
|
xfs_dquot_t *dqp)
|
|
{
|
|
if (!dqp)
|
|
return;
|
|
|
|
trace_xfs_dqrele(dqp);
|
|
|
|
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);
|
|
}
|
|
|
|
/*
|
|
* 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..
|
|
*/
|
|
STATIC void
|
|
xfs_qm_dqflush_done(
|
|
struct xfs_buf *bp,
|
|
struct xfs_log_item *lip)
|
|
{
|
|
xfs_dq_logitem_t *qip = (struct xfs_dq_logitem *)lip;
|
|
xfs_dquot_t *dqp = qip->qli_dquot;
|
|
struct xfs_ail *ailp = lip->li_ailp;
|
|
|
|
/*
|
|
* 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 ((lip->li_flags & XFS_LI_IN_AIL) &&
|
|
lip->li_lsn == qip->qli_flush_lsn) {
|
|
|
|
/* xfs_trans_ail_delete() drops the AIL lock. */
|
|
spin_lock(&ailp->xa_lock);
|
|
if (lip->li_lsn == qip->qli_flush_lsn)
|
|
xfs_trans_ail_delete(ailp, lip, SHUTDOWN_CORRUPT_INCORE);
|
|
else
|
|
spin_unlock(&ailp->xa_lock);
|
|
}
|
|
|
|
/*
|
|
* Release the dq's flush lock since we're done with it.
|
|
*/
|
|
xfs_dqfunlock(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(
|
|
struct xfs_dquot *dqp,
|
|
struct xfs_buf **bpp)
|
|
{
|
|
struct xfs_mount *mp = dqp->q_mount;
|
|
struct xfs_buf *bp;
|
|
struct xfs_disk_dquot *ddqp;
|
|
int error;
|
|
|
|
ASSERT(XFS_DQ_IS_LOCKED(dqp));
|
|
ASSERT(!completion_done(&dqp->q_flush));
|
|
|
|
trace_xfs_dqflush(dqp);
|
|
|
|
*bpp = NULL;
|
|
|
|
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.
|
|
*
|
|
* We also have to remove the log item from the AIL in this case,
|
|
* as we wait for an emptry AIL as part of the unmount process.
|
|
*/
|
|
if (XFS_FORCED_SHUTDOWN(mp)) {
|
|
struct xfs_log_item *lip = &dqp->q_logitem.qli_item;
|
|
dqp->dq_flags &= ~XFS_DQ_DIRTY;
|
|
|
|
spin_lock(&mp->m_ail->xa_lock);
|
|
if (lip->li_flags & XFS_LI_IN_AIL)
|
|
xfs_trans_ail_delete(mp->m_ail, lip,
|
|
SHUTDOWN_CORRUPT_INCORE);
|
|
else
|
|
spin_unlock(&mp->m_ail->xa_lock);
|
|
error = -EIO;
|
|
goto out_unlock;
|
|
}
|
|
|
|
/*
|
|
* Get the buffer containing the on-disk dquot
|
|
*/
|
|
error = xfs_trans_read_buf(mp, NULL, mp->m_ddev_targp, dqp->q_blkno,
|
|
mp->m_quotainfo->qi_dqchunklen, 0, &bp,
|
|
&xfs_dquot_buf_ops);
|
|
if (error)
|
|
goto out_unlock;
|
|
|
|
/*
|
|
* Calculate the location of the dquot inside the buffer.
|
|
*/
|
|
ddqp = bp->b_addr + dqp->q_bufoffset;
|
|
|
|
/*
|
|
* A simple sanity check in case we got a corrupted dquot..
|
|
*/
|
|
error = xfs_dqcheck(mp, &dqp->q_core, be32_to_cpu(ddqp->d_id), 0,
|
|
XFS_QMOPT_DOWARN, "dqflush (incore copy)");
|
|
if (error) {
|
|
xfs_buf_relse(bp);
|
|
xfs_dqfunlock(dqp);
|
|
xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE);
|
|
return -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;
|
|
|
|
xfs_trans_ail_copy_lsn(mp->m_ail, &dqp->q_logitem.qli_flush_lsn,
|
|
&dqp->q_logitem.qli_item.li_lsn);
|
|
|
|
/*
|
|
* copy the lsn into the on-disk dquot now while we have the in memory
|
|
* dquot here. This can't be done later in the write verifier as we
|
|
* can't get access to the log item at that point in time.
|
|
*
|
|
* We also calculate the CRC here so that the on-disk dquot in the
|
|
* buffer always has a valid CRC. This ensures there is no possibility
|
|
* of a dquot without an up-to-date CRC getting to disk.
|
|
*/
|
|
if (xfs_sb_version_hascrc(&mp->m_sb)) {
|
|
struct xfs_dqblk *dqb = (struct xfs_dqblk *)ddqp;
|
|
|
|
dqb->dd_lsn = cpu_to_be64(dqp->q_logitem.qli_item.li_lsn);
|
|
xfs_update_cksum((char *)dqb, sizeof(struct xfs_dqblk),
|
|
XFS_DQUOT_CRC_OFF);
|
|
}
|
|
|
|
/*
|
|
* 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, 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)) {
|
|
trace_xfs_dqflush_force(dqp);
|
|
xfs_log_force(mp, 0);
|
|
}
|
|
|
|
trace_xfs_dqflush_done(dqp);
|
|
*bpp = bp;
|
|
return 0;
|
|
|
|
out_unlock:
|
|
xfs_dqfunlock(dqp);
|
|
return -EIO;
|
|
}
|
|
|
|
/*
|
|
* Lock two xfs_dquot structures.
|
|
*
|
|
* To avoid deadlocks we always lock the quota structure with
|
|
* the lowerd id first.
|
|
*/
|
|
void
|
|
xfs_dqlock2(
|
|
xfs_dquot_t *d1,
|
|
xfs_dquot_t *d2)
|
|
{
|
|
if (d1 && d2) {
|
|
ASSERT(d1 != d2);
|
|
if (be32_to_cpu(d1->q_core.d_id) >
|
|
be32_to_cpu(d2->q_core.d_id)) {
|
|
mutex_lock(&d2->q_qlock);
|
|
mutex_lock_nested(&d1->q_qlock, XFS_QLOCK_NESTED);
|
|
} else {
|
|
mutex_lock(&d1->q_qlock);
|
|
mutex_lock_nested(&d2->q_qlock, XFS_QLOCK_NESTED);
|
|
}
|
|
} else if (d1) {
|
|
mutex_lock(&d1->q_qlock);
|
|
} else if (d2) {
|
|
mutex_lock(&d2->q_qlock);
|
|
}
|
|
}
|
|
|
|
int __init
|
|
xfs_qm_init(void)
|
|
{
|
|
xfs_qm_dqzone =
|
|
kmem_zone_init(sizeof(struct xfs_dquot), "xfs_dquot");
|
|
if (!xfs_qm_dqzone)
|
|
goto out;
|
|
|
|
xfs_qm_dqtrxzone =
|
|
kmem_zone_init(sizeof(struct xfs_dquot_acct), "xfs_dqtrx");
|
|
if (!xfs_qm_dqtrxzone)
|
|
goto out_free_dqzone;
|
|
|
|
return 0;
|
|
|
|
out_free_dqzone:
|
|
kmem_zone_destroy(xfs_qm_dqzone);
|
|
out:
|
|
return -ENOMEM;
|
|
}
|
|
|
|
void
|
|
xfs_qm_exit(void)
|
|
{
|
|
kmem_zone_destroy(xfs_qm_dqtrxzone);
|
|
kmem_zone_destroy(xfs_qm_dqzone);
|
|
}
|