xfs_qm_syscalls.c

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/*
 * Copyright (c) 2000-2005 Silicon Graphics, Inc.
 * All Rights Reserved.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms 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.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write the Free Software Foundation,
 * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 */

#include <linux/capability.h>

#include "xfs.h"
#include "xfs_fs.h"
#include "xfs_bit.h"
#include "xfs_log.h"
#include "xfs_trans.h"
#include "xfs_sb.h"
#include "xfs_ag.h"
#include "xfs_alloc.h"
#include "xfs_quota.h"
#include "xfs_mount.h"
#include "xfs_bmap_btree.h"
#include "xfs_inode.h"
#include "xfs_inode_item.h"
#include "xfs_itable.h"
#include "xfs_bmap.h"
#include "xfs_rtalloc.h"
#include "xfs_error.h"
#include "xfs_attr.h"
#include "xfs_buf_item.h"
#include "xfs_utils.h"
#include "xfs_qm.h"
#include "xfs_trace.h"

STATIC int  xfs_qm_log_quotaoff(xfs_mount_t *, xfs_qoff_logitem_t **, uint);
STATIC int  xfs_qm_log_quotaoff_end(xfs_mount_t *, xfs_qoff_logitem_t *,
                    uint);
STATIC uint xfs_qm_export_flags(uint);
STATIC uint xfs_qm_export_qtype_flags(uint);

/*
 * Turn off quota accounting and/or enforcement for all udquots and/or
 * gdquots. Called only at unmount time.
 *
 * This assumes that there are no dquots of this file system cached
 * incore, and modifies the ondisk dquot directly. Therefore, for example,
 * it is an error to call this twice, without purging the cache.
 */
int
xfs_qm_scall_quotaoff(
    xfs_mount_t     *mp,
    uint            flags)
{
    struct xfs_quotainfo    *q = mp->m_quotainfo;
    uint            dqtype;
    int         error;
    uint            inactivate_flags;
    xfs_qoff_logitem_t  *qoffstart;

    /*
     * No file system can have quotas enabled on disk but not in core.
     * Note that quota utilities (like quotaoff) _expect_
     * errno == EEXIST here.
     */
    if ((mp->m_qflags & flags) == 0)
        return XFS_ERROR(EEXIST);
    error = 0;

    flags &= (XFS_ALL_QUOTA_ACCT | XFS_ALL_QUOTA_ENFD);

    /*
     * We don't want to deal with two quotaoffs messing up each other,
     * so we're going to serialize it. quotaoff isn't exactly a performance
     * critical thing.
     * If quotaoff, then we must be dealing with the root filesystem.
     */
    ASSERT(q);
    mutex_lock(&q->qi_quotaofflock);

    /*
     * If we're just turning off quota enforcement, change mp and go.
     */
    if ((flags & XFS_ALL_QUOTA_ACCT) == 0) {
        mp->m_qflags &= ~(flags);

        spin_lock(&mp->m_sb_lock);
        mp->m_sb.sb_qflags = mp->m_qflags;
        spin_unlock(&mp->m_sb_lock);
        mutex_unlock(&q->qi_quotaofflock);

        /* XXX what to do if error ? Revert back to old vals incore ? */
        error = xfs_qm_write_sb_changes(mp, XFS_SB_QFLAGS);
        return (error);
    }

    dqtype = 0;
    inactivate_flags = 0;
    /*
     * If accounting is off, we must turn enforcement off, clear the
     * quota 'CHKD' certificate to make it known that we have to
     * do a quotacheck the next time this quota is turned on.
     */
    if (flags & XFS_UQUOTA_ACCT) {
        dqtype |= XFS_QMOPT_UQUOTA;
        flags |= (XFS_UQUOTA_CHKD | XFS_UQUOTA_ENFD);
        inactivate_flags |= XFS_UQUOTA_ACTIVE;
    }
    if (flags & XFS_GQUOTA_ACCT) {
        dqtype |= XFS_QMOPT_GQUOTA;
        flags |= (XFS_OQUOTA_CHKD | XFS_OQUOTA_ENFD);
        inactivate_flags |= XFS_GQUOTA_ACTIVE;
    } else if (flags & XFS_PQUOTA_ACCT) {
        dqtype |= XFS_QMOPT_PQUOTA;
        flags |= (XFS_OQUOTA_CHKD | XFS_OQUOTA_ENFD);
        inactivate_flags |= XFS_PQUOTA_ACTIVE;
    }

    /*
     * Nothing to do?  Don't complain. This happens when we're just
     * turning off quota enforcement.
     */
    if ((mp->m_qflags & flags) == 0)
        goto out_unlock;

    /*
     * Write the LI_QUOTAOFF log record, and do SB changes atomically,
     * and synchronously. If we fail to write, we should abort the
     * operation as it cannot be recovered safely if we crash.
     */
    error = xfs_qm_log_quotaoff(mp, &qoffstart, flags);
    if (error)
        goto out_unlock;

    /*
     * Next we clear the XFS_MOUNT_*DQ_ACTIVE bit(s) in the mount struct
     * to take care of the race between dqget and quotaoff. We don't take
     * any special locks to reset these bits. All processes need to check
     * these bits *after* taking inode lock(s) to see if the particular
     * quota type is in the process of being turned off. If *ACTIVE, it is
     * guaranteed that all dquot structures and all quotainode ptrs will all
     * stay valid as long as that inode is kept locked.
     *
     * There is no turning back after this.
     */
    mp->m_qflags &= ~inactivate_flags;

    /*
     * Give back all the dquot reference(s) held by inodes.
     * Here we go thru every single incore inode in this file system, and
     * do a dqrele on the i_udquot/i_gdquot that it may have.
     * Essentially, as long as somebody has an inode locked, this guarantees
     * that quotas will not be turned off. This is handy because in a
     * transaction once we lock the inode(s) and check for quotaon, we can
     * depend on the quota inodes (and other things) being valid as long as
     * we keep the lock(s).
     */
    xfs_qm_dqrele_all_inodes(mp, flags);

    /*
     * Next we make the changes in the quota flag in the mount struct.
     * This isn't protected by a particular lock directly, because we
     * don't want to take a mrlock every time we depend on quotas being on.
     */
    mp->m_qflags &= ~flags;

    /*
     * Go through all the dquots of this file system and purge them,
     * according to what was turned off.
     */
    xfs_qm_dqpurge_all(mp, dqtype);

    /*
     * Transactions that had started before ACTIVE state bit was cleared
     * could have logged many dquots, so they'd have higher LSNs than
     * the first QUOTAOFF log record does. If we happen to crash when
     * the tail of the log has gone past the QUOTAOFF record, but
     * before the last dquot modification, those dquots __will__
     * recover, and that's not good.
     *
     * So, we have QUOTAOFF start and end logitems; the start
     * logitem won't get overwritten until the end logitem appears...
     */
    error = xfs_qm_log_quotaoff_end(mp, qoffstart, flags);
    if (error) {
        /* We're screwed now. Shutdown is the only option. */
        xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE);
        goto out_unlock;
    }

    /*
     * If quotas is completely disabled, close shop.
     */
    if (((flags & XFS_MOUNT_QUOTA_ALL) == XFS_MOUNT_QUOTA_SET1) ||
        ((flags & XFS_MOUNT_QUOTA_ALL) == XFS_MOUNT_QUOTA_SET2)) {
        mutex_unlock(&q->qi_quotaofflock);
        xfs_qm_destroy_quotainfo(mp);
        return (0);
    }

    /*
     * Release our quotainode references if we don't need them anymore.
     */
    if ((dqtype & XFS_QMOPT_UQUOTA) && q->qi_uquotaip) {
        IRELE(q->qi_uquotaip);
        q->qi_uquotaip = NULL;
    }
    if ((dqtype & (XFS_QMOPT_GQUOTA|XFS_QMOPT_PQUOTA)) && q->qi_gquotaip) {
        IRELE(q->qi_gquotaip);
        q->qi_gquotaip = NULL;
    }

out_unlock:
    mutex_unlock(&q->qi_quotaofflock);
    return error;
}

STATIC int
xfs_qm_scall_trunc_qfile(
    struct xfs_mount    *mp,
    xfs_ino_t       ino)
{
    struct xfs_inode    *ip;
    struct xfs_trans    *tp;
    int         error;

    if (ino == NULLFSINO)
        return 0;

    error = xfs_iget(mp, NULL, ino, 0, 0, &ip);
    if (error)
        return error;

    xfs_ilock(ip, XFS_IOLOCK_EXCL);

    tp = xfs_trans_alloc(mp, XFS_TRANS_TRUNCATE_FILE);
    error = xfs_trans_reserve(tp, 0, XFS_ITRUNCATE_LOG_RES(mp), 0,
                  XFS_TRANS_PERM_LOG_RES,
                  XFS_ITRUNCATE_LOG_COUNT);
    if (error) {
        xfs_trans_cancel(tp, 0);
        xfs_iunlock(ip, XFS_IOLOCK_EXCL);
        goto out_put;
    }

    xfs_ilock(ip, XFS_ILOCK_EXCL);
    xfs_trans_ijoin(tp, ip, 0);

    ip->i_d.di_size = 0;
    xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);

    error = xfs_itruncate_extents(&tp, ip, XFS_DATA_FORK, 0);
    if (error) {
        xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES |
                     XFS_TRANS_ABORT);
        goto out_unlock;
    }

    ASSERT(ip->i_d.di_nextents == 0);

    xfs_trans_ichgtime(tp, ip, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG);
    error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES);

out_unlock:
    xfs_iunlock(ip, XFS_ILOCK_EXCL | XFS_IOLOCK_EXCL);
out_put:
    IRELE(ip);
    return error;
}

int
xfs_qm_scall_trunc_qfiles(
    xfs_mount_t *mp,
    uint        flags)
{
    int     error = 0, error2 = 0;

    if (!xfs_sb_version_hasquota(&mp->m_sb) || flags == 0) {
        xfs_debug(mp, "%s: flags=%x m_qflags=%x\n",
            __func__, flags, mp->m_qflags);
        return XFS_ERROR(EINVAL);
    }

    if (flags & XFS_DQ_USER)
        error = xfs_qm_scall_trunc_qfile(mp, mp->m_sb.sb_uquotino);
    if (flags & (XFS_DQ_GROUP|XFS_DQ_PROJ))
        error2 = xfs_qm_scall_trunc_qfile(mp, mp->m_sb.sb_gquotino);

    return error ? error : error2;
}

/*
 * Switch on (a given) quota enforcement for a filesystem.  This takes
 * effect immediately.
 * (Switching on quota accounting must be done at mount time.)
 */
int
xfs_qm_scall_quotaon(
    xfs_mount_t *mp,
    uint        flags)
{
    int     error;
    uint        qf;
    __int64_t   sbflags;

    flags &= (XFS_ALL_QUOTA_ACCT | XFS_ALL_QUOTA_ENFD);
    /*
     * Switching on quota accounting must be done at mount time.
     */
    flags &= ~(XFS_ALL_QUOTA_ACCT);

    sbflags = 0;

    if (flags == 0) {
        xfs_debug(mp, "%s: zero flags, m_qflags=%x\n",
            __func__, mp->m_qflags);
        return XFS_ERROR(EINVAL);
    }

    /* No fs can turn on quotas with a delayed effect */
    ASSERT((flags & XFS_ALL_QUOTA_ACCT) == 0);

    /*
     * Can't enforce without accounting. We check the superblock
     * qflags here instead of m_qflags because rootfs can have
     * quota acct on ondisk without m_qflags' knowing.
     */
    if (((flags & XFS_UQUOTA_ACCT) == 0 &&
        (mp->m_sb.sb_qflags & XFS_UQUOTA_ACCT) == 0 &&
        (flags & XFS_UQUOTA_ENFD))
        ||
        ((flags & XFS_PQUOTA_ACCT) == 0 &&
        (mp->m_sb.sb_qflags & XFS_PQUOTA_ACCT) == 0 &&
        (flags & XFS_GQUOTA_ACCT) == 0 &&
        (mp->m_sb.sb_qflags & XFS_GQUOTA_ACCT) == 0 &&
        (flags & XFS_OQUOTA_ENFD))) {
        xfs_debug(mp,
            "%s: Can't enforce without acct, flags=%x sbflags=%x\n",
            __func__, flags, mp->m_sb.sb_qflags);
        return XFS_ERROR(EINVAL);
    }
    /*
     * If everything's up to-date incore, then don't waste time.
     */
    if ((mp->m_qflags & flags) == flags)
        return XFS_ERROR(EEXIST);

    /*
     * Change sb_qflags on disk but not incore mp->qflags
     * if this is the root filesystem.
     */
    spin_lock(&mp->m_sb_lock);
    qf = mp->m_sb.sb_qflags;
    mp->m_sb.sb_qflags = qf | flags;
    spin_unlock(&mp->m_sb_lock);

    /*
     * There's nothing to change if it's the same.
     */
    if ((qf & flags) == flags && sbflags == 0)
        return XFS_ERROR(EEXIST);
    sbflags |= XFS_SB_QFLAGS;

    if ((error = xfs_qm_write_sb_changes(mp, sbflags)))
        return (error);
    /*
     * If we aren't trying to switch on quota enforcement, we are done.
     */
    if  (((mp->m_sb.sb_qflags & XFS_UQUOTA_ACCT) !=
         (mp->m_qflags & XFS_UQUOTA_ACCT)) ||
         ((mp->m_sb.sb_qflags & XFS_PQUOTA_ACCT) !=
         (mp->m_qflags & XFS_PQUOTA_ACCT)) ||
         ((mp->m_sb.sb_qflags & XFS_GQUOTA_ACCT) !=
         (mp->m_qflags & XFS_GQUOTA_ACCT)) ||
        (flags & XFS_ALL_QUOTA_ENFD) == 0)
        return (0);

    if (! XFS_IS_QUOTA_RUNNING(mp))
        return XFS_ERROR(ESRCH);

    /*
     * Switch on quota enforcement in core.
     */
    mutex_lock(&mp->m_quotainfo->qi_quotaofflock);
    mp->m_qflags |= (flags & XFS_ALL_QUOTA_ENFD);
    mutex_unlock(&mp->m_quotainfo->qi_quotaofflock);

    return (0);
}


/*
 * Return quota status information, such as uquota-off, enforcements, etc.
 */
int
xfs_qm_scall_getqstat(
    struct xfs_mount    *mp,
    struct fs_quota_stat    *out)
{
    struct xfs_quotainfo    *q = mp->m_quotainfo;
    struct xfs_inode    *uip, *gip;
    boolean_t       tempuqip, tempgqip;

    uip = gip = NULL;
    tempuqip = tempgqip = B_FALSE;
    memset(out, 0, sizeof(fs_quota_stat_t));

    out->qs_version = FS_QSTAT_VERSION;
    if (!xfs_sb_version_hasquota(&mp->m_sb)) {
        out->qs_uquota.qfs_ino = NULLFSINO;
        out->qs_gquota.qfs_ino = NULLFSINO;
        return (0);
    }
    out->qs_flags = (__uint16_t) xfs_qm_export_flags(mp->m_qflags &
                            (XFS_ALL_QUOTA_ACCT|
                             XFS_ALL_QUOTA_ENFD));
    out->qs_pad = 0;
    out->qs_uquota.qfs_ino = mp->m_sb.sb_uquotino;
    out->qs_gquota.qfs_ino = mp->m_sb.sb_gquotino;

    if (q) {
        uip = q->qi_uquotaip;
        gip = q->qi_gquotaip;
    }
    if (!uip && mp->m_sb.sb_uquotino != NULLFSINO) {
        if (xfs_iget(mp, NULL, mp->m_sb.sb_uquotino,
                    0, 0, &uip) == 0)
            tempuqip = B_TRUE;
    }
    if (!gip && mp->m_sb.sb_gquotino != NULLFSINO) {
        if (xfs_iget(mp, NULL, mp->m_sb.sb_gquotino,
                    0, 0, &gip) == 0)
            tempgqip = B_TRUE;
    }
    if (uip) {
        out->qs_uquota.qfs_nblks = uip->i_d.di_nblocks;
        out->qs_uquota.qfs_nextents = uip->i_d.di_nextents;
        if (tempuqip)
            IRELE(uip);
    }
    if (gip) {
        out->qs_gquota.qfs_nblks = gip->i_d.di_nblocks;
        out->qs_gquota.qfs_nextents = gip->i_d.di_nextents;
        if (tempgqip)
            IRELE(gip);
    }
    if (q) {
        out->qs_incoredqs = q->qi_dquots;
        out->qs_btimelimit = q->qi_btimelimit;
        out->qs_itimelimit = q->qi_itimelimit;
        out->qs_rtbtimelimit = q->qi_rtbtimelimit;
        out->qs_bwarnlimit = q->qi_bwarnlimit;
        out->qs_iwarnlimit = q->qi_iwarnlimit;
    }
    return 0;
}

#define XFS_DQ_MASK \
    (FS_DQ_LIMIT_MASK | FS_DQ_TIMER_MASK | FS_DQ_WARNS_MASK)

/*
 * Adjust quota limits, and start/stop timers accordingly.
 */
int
xfs_qm_scall_setqlim(
    xfs_mount_t     *mp,
    xfs_dqid_t      id,
    uint            type,
    fs_disk_quota_t     *newlim)
{
    struct xfs_quotainfo    *q = mp->m_quotainfo;
    xfs_disk_dquot_t    *ddq;
    xfs_dquot_t     *dqp;
    xfs_trans_t     *tp;
    int         error;
    xfs_qcnt_t      hard, soft;

    if (newlim->d_fieldmask & ~XFS_DQ_MASK)
        return EINVAL;
    if ((newlim->d_fieldmask & XFS_DQ_MASK) == 0)
        return 0;

    tp = xfs_trans_alloc(mp, XFS_TRANS_QM_SETQLIM);
    if ((error = xfs_trans_reserve(tp, 0, sizeof(xfs_disk_dquot_t) + 128,
                      0, 0, XFS_DEFAULT_LOG_COUNT))) {
        xfs_trans_cancel(tp, 0);
        return (error);
    }

    /*
     * We don't want to race with a quotaoff so take the quotaoff lock.
     * (We don't hold an inode lock, so there's nothing else to stop
     * a quotaoff from happening). (XXXThis doesn't currently happen
     * because we take the vfslock before calling xfs_qm_sysent).
     */
    mutex_lock(&q->qi_quotaofflock);

    /*
     * Get the dquot (locked), and join it to the transaction.
     * Allocate the dquot if this doesn't exist.
     */
    if ((error = xfs_qm_dqget(mp, NULL, id, type, XFS_QMOPT_DQALLOC, &dqp))) {
        xfs_trans_cancel(tp, XFS_TRANS_ABORT);
        ASSERT(error != ENOENT);
        goto out_unlock;
    }
    xfs_trans_dqjoin(tp, dqp);
    ddq = &dqp->q_core;

    /*
     * Make sure that hardlimits are >= soft limits before changing.
     */
    hard = (newlim->d_fieldmask & FS_DQ_BHARD) ?
        (xfs_qcnt_t) XFS_BB_TO_FSB(mp, newlim->d_blk_hardlimit) :
            be64_to_cpu(ddq->d_blk_hardlimit);
    soft = (newlim->d_fieldmask & FS_DQ_BSOFT) ?
        (xfs_qcnt_t) XFS_BB_TO_FSB(mp, newlim->d_blk_softlimit) :
            be64_to_cpu(ddq->d_blk_softlimit);
    if (hard == 0 || hard >= soft) {
        ddq->d_blk_hardlimit = cpu_to_be64(hard);
        ddq->d_blk_softlimit = cpu_to_be64(soft);
        if (id == 0) {
            q->qi_bhardlimit = hard;
            q->qi_bsoftlimit = soft;
        }
    } else {
        xfs_debug(mp, "blkhard %Ld < blksoft %Ld\n", hard, soft);
    }
    hard = (newlim->d_fieldmask & FS_DQ_RTBHARD) ?
        (xfs_qcnt_t) XFS_BB_TO_FSB(mp, newlim->d_rtb_hardlimit) :
            be64_to_cpu(ddq->d_rtb_hardlimit);
    soft = (newlim->d_fieldmask & FS_DQ_RTBSOFT) ?
        (xfs_qcnt_t) XFS_BB_TO_FSB(mp, newlim->d_rtb_softlimit) :
            be64_to_cpu(ddq->d_rtb_softlimit);
    if (hard == 0 || hard >= soft) {
        ddq->d_rtb_hardlimit = cpu_to_be64(hard);
        ddq->d_rtb_softlimit = cpu_to_be64(soft);
        if (id == 0) {
            q->qi_rtbhardlimit = hard;
            q->qi_rtbsoftlimit = soft;
        }
    } else {
        xfs_debug(mp, "rtbhard %Ld < rtbsoft %Ld\n", hard, soft);
    }

    hard = (newlim->d_fieldmask & FS_DQ_IHARD) ?
        (xfs_qcnt_t) newlim->d_ino_hardlimit :
            be64_to_cpu(ddq->d_ino_hardlimit);
    soft = (newlim->d_fieldmask & FS_DQ_ISOFT) ?
        (xfs_qcnt_t) newlim->d_ino_softlimit :
            be64_to_cpu(ddq->d_ino_softlimit);
    if (hard == 0 || hard >= soft) {
        ddq->d_ino_hardlimit = cpu_to_be64(hard);
        ddq->d_ino_softlimit = cpu_to_be64(soft);
        if (id == 0) {
            q->qi_ihardlimit = hard;
            q->qi_isoftlimit = soft;
        }
    } else {
        xfs_debug(mp, "ihard %Ld < isoft %Ld\n", hard, soft);
    }

    /*
     * Update warnings counter(s) if requested
     */
    if (newlim->d_fieldmask & FS_DQ_BWARNS)
        ddq->d_bwarns = cpu_to_be16(newlim->d_bwarns);
    if (newlim->d_fieldmask & FS_DQ_IWARNS)
        ddq->d_iwarns = cpu_to_be16(newlim->d_iwarns);
    if (newlim->d_fieldmask & FS_DQ_RTBWARNS)
        ddq->d_rtbwarns = cpu_to_be16(newlim->d_rtbwarns);

    if (id == 0) {
        /*
         * Timelimits for the super user set the relative time
         * the other users can be over quota for this file system.
         * If it is zero a default is used.  Ditto for the default
         * soft and hard limit values (already done, above), and
         * for warnings.
         */
        if (newlim->d_fieldmask & FS_DQ_BTIMER) {
            q->qi_btimelimit = newlim->d_btimer;
            ddq->d_btimer = cpu_to_be32(newlim->d_btimer);
        }
        if (newlim->d_fieldmask & FS_DQ_ITIMER) {
            q->qi_itimelimit = newlim->d_itimer;
            ddq->d_itimer = cpu_to_be32(newlim->d_itimer);
        }
        if (newlim->d_fieldmask & FS_DQ_RTBTIMER) {
            q->qi_rtbtimelimit = newlim->d_rtbtimer;
            ddq->d_rtbtimer = cpu_to_be32(newlim->d_rtbtimer);
        }
        if (newlim->d_fieldmask & FS_DQ_BWARNS)
            q->qi_bwarnlimit = newlim->d_bwarns;
        if (newlim->d_fieldmask & FS_DQ_IWARNS)
            q->qi_iwarnlimit = newlim->d_iwarns;
        if (newlim->d_fieldmask & FS_DQ_RTBWARNS)
            q->qi_rtbwarnlimit = newlim->d_rtbwarns;
    } else {
        /*
         * If the user is now over quota, start the timelimit.
         * The user will not be 'warned'.
         * Note that we keep the timers ticking, whether enforcement
         * is on or off. We don't really want to bother with iterating
         * over all ondisk dquots and turning the timers on/off.
         */
        xfs_qm_adjust_dqtimers(mp, ddq);
    }
    dqp->dq_flags |= XFS_DQ_DIRTY;
    xfs_trans_log_dquot(tp, dqp);

    error = xfs_trans_commit(tp, 0);
    xfs_qm_dqrele(dqp);

 out_unlock:
    mutex_unlock(&q->qi_quotaofflock);
    return error;
}

STATIC int
xfs_qm_log_quotaoff_end(
    xfs_mount_t     *mp,
    xfs_qoff_logitem_t  *startqoff,
    uint            flags)
{
    xfs_trans_t     *tp;
    int         error;
    xfs_qoff_logitem_t  *qoffi;

    tp = xfs_trans_alloc(mp, XFS_TRANS_QM_QUOTAOFF_END);

    if ((error = xfs_trans_reserve(tp, 0, sizeof(xfs_qoff_logitem_t) * 2,
                      0, 0, XFS_DEFAULT_LOG_COUNT))) {
        xfs_trans_cancel(tp, 0);
        return (error);
    }

    qoffi = xfs_trans_get_qoff_item(tp, startqoff,
                    flags & XFS_ALL_QUOTA_ACCT);
    xfs_trans_log_quotaoff_item(tp, qoffi);

    /*
     * We have to make sure that the transaction is secure on disk before we
     * return and actually stop quota accounting. So, make it synchronous.
     * We don't care about quotoff's performance.
     */
    xfs_trans_set_sync(tp);
    error = xfs_trans_commit(tp, 0);
    return (error);
}


STATIC int
xfs_qm_log_quotaoff(
    xfs_mount_t        *mp,
    xfs_qoff_logitem_t     **qoffstartp,
    uint               flags)
{
    xfs_trans_t        *tp;
    int         error;
    xfs_qoff_logitem_t     *qoffi=NULL;
    uint            oldsbqflag=0;

    tp = xfs_trans_alloc(mp, XFS_TRANS_QM_QUOTAOFF);
    if ((error = xfs_trans_reserve(tp, 0,
                      sizeof(xfs_qoff_logitem_t) * 2 +
                      mp->m_sb.sb_sectsize + 128,
                      0,
                      0,
                      XFS_DEFAULT_LOG_COUNT))) {
        goto error0;
    }

    qoffi = xfs_trans_get_qoff_item(tp, NULL, flags & XFS_ALL_QUOTA_ACCT);
    xfs_trans_log_quotaoff_item(tp, qoffi);

    spin_lock(&mp->m_sb_lock);
    oldsbqflag = mp->m_sb.sb_qflags;
    mp->m_sb.sb_qflags = (mp->m_qflags & ~(flags)) & XFS_MOUNT_QUOTA_ALL;
    spin_unlock(&mp->m_sb_lock);

    xfs_mod_sb(tp, XFS_SB_QFLAGS);

    /*
     * We have to make sure that the transaction is secure on disk before we
     * return and actually stop quota accounting. So, make it synchronous.
     * We don't care about quotoff's performance.
     */
    xfs_trans_set_sync(tp);
    error = xfs_trans_commit(tp, 0);

error0:
    if (error) {
        xfs_trans_cancel(tp, 0);
        /*
         * No one else is modifying sb_qflags, so this is OK.
         * We still hold the quotaofflock.
         */
        spin_lock(&mp->m_sb_lock);
        mp->m_sb.sb_qflags = oldsbqflag;
        spin_unlock(&mp->m_sb_lock);
    }
    *qoffstartp = qoffi;
    return (error);
}


int
xfs_qm_scall_getquota(
    struct xfs_mount    *mp,
    xfs_dqid_t      id,
    uint            type,
    struct fs_disk_quota    *dst)
{
    struct xfs_dquot    *dqp;
    int         error;

    /*
     * Try to get the dquot. We don't want it allocated on disk, so
     * we aren't passing the XFS_QMOPT_DOALLOC flag. If it doesn't
     * exist, we'll get ENOENT back.
     */
    error = xfs_qm_dqget(mp, NULL, id, type, 0, &dqp);
    if (error)
        return error;

    /*
     * If everything's NULL, this dquot doesn't quite exist as far as
     * our utility programs are concerned.
     */
    if (XFS_IS_DQUOT_UNINITIALIZED(dqp)) {
        error = XFS_ERROR(ENOENT);
        goto out_put;
    }

    memset(dst, 0, sizeof(*dst));
    dst->d_version = FS_DQUOT_VERSION;
    dst->d_flags = xfs_qm_export_qtype_flags(dqp->q_core.d_flags);
    dst->d_id = be32_to_cpu(dqp->q_core.d_id);
    dst->d_blk_hardlimit =
        XFS_FSB_TO_BB(mp, be64_to_cpu(dqp->q_core.d_blk_hardlimit));
    dst->d_blk_softlimit =
        XFS_FSB_TO_BB(mp, be64_to_cpu(dqp->q_core.d_blk_softlimit));
    dst->d_ino_hardlimit = be64_to_cpu(dqp->q_core.d_ino_hardlimit);
    dst->d_ino_softlimit = be64_to_cpu(dqp->q_core.d_ino_softlimit);
    dst->d_bcount = XFS_FSB_TO_BB(mp, dqp->q_res_bcount);
    dst->d_icount = dqp->q_res_icount;
    dst->d_btimer = be32_to_cpu(dqp->q_core.d_btimer);
    dst->d_itimer = be32_to_cpu(dqp->q_core.d_itimer);
    dst->d_iwarns = be16_to_cpu(dqp->q_core.d_iwarns);
    dst->d_bwarns = be16_to_cpu(dqp->q_core.d_bwarns);
    dst->d_rtb_hardlimit =
        XFS_FSB_TO_BB(mp, be64_to_cpu(dqp->q_core.d_rtb_hardlimit));
    dst->d_rtb_softlimit =
        XFS_FSB_TO_BB(mp, be64_to_cpu(dqp->q_core.d_rtb_softlimit));
    dst->d_rtbcount = XFS_FSB_TO_BB(mp, dqp->q_res_rtbcount);
    dst->d_rtbtimer = be32_to_cpu(dqp->q_core.d_rtbtimer);
    dst->d_rtbwarns = be16_to_cpu(dqp->q_core.d_rtbwarns);

    /*
     * Internally, we don't reset all the timers when quota enforcement
     * gets turned off. No need to confuse the user level code,
     * so return zeroes in that case.
     */
    if ((!XFS_IS_UQUOTA_ENFORCED(mp) && dqp->q_core.d_flags == XFS_DQ_USER) ||
        (!XFS_IS_OQUOTA_ENFORCED(mp) &&
            (dqp->q_core.d_flags & (XFS_DQ_PROJ | XFS_DQ_GROUP)))) {
        dst->d_btimer = 0;
        dst->d_itimer = 0;
        dst->d_rtbtimer = 0;
    }

#ifdef DEBUG
    if (((XFS_IS_UQUOTA_ENFORCED(mp) && dst->d_flags == FS_USER_QUOTA) ||
         (XFS_IS_OQUOTA_ENFORCED(mp) &&
            (dst->d_flags & (FS_PROJ_QUOTA | FS_GROUP_QUOTA)))) &&
        dst->d_id != 0) {
        if (((int) dst->d_bcount > (int) dst->d_blk_softlimit) &&
            (dst->d_blk_softlimit > 0)) {
            ASSERT(dst->d_btimer != 0);
        }
        if (((int) dst->d_icount > (int) dst->d_ino_softlimit) &&
            (dst->d_ino_softlimit > 0)) {
            ASSERT(dst->d_itimer != 0);
        }
    }
#endif
out_put:
    xfs_qm_dqput(dqp);
    return error;
}

STATIC uint
xfs_qm_export_qtype_flags(
    uint flags)
{
    /*
     * Can't be more than one, or none.
     */
    ASSERT((flags & (FS_PROJ_QUOTA | FS_USER_QUOTA)) !=
        (FS_PROJ_QUOTA | FS_USER_QUOTA));
    ASSERT((flags & (FS_PROJ_QUOTA | FS_GROUP_QUOTA)) !=
        (FS_PROJ_QUOTA | FS_GROUP_QUOTA));
    ASSERT((flags & (FS_USER_QUOTA | FS_GROUP_QUOTA)) !=
        (FS_USER_QUOTA | FS_GROUP_QUOTA));
    ASSERT((flags & (FS_PROJ_QUOTA|FS_USER_QUOTA|FS_GROUP_QUOTA)) != 0);

    return (flags & XFS_DQ_USER) ?
        FS_USER_QUOTA : (flags & XFS_DQ_PROJ) ?
            FS_PROJ_QUOTA : FS_GROUP_QUOTA;
}

STATIC uint
xfs_qm_export_flags(
    uint flags)
{
    uint uflags;

    uflags = 0;
    if (flags & XFS_UQUOTA_ACCT)
        uflags |= FS_QUOTA_UDQ_ACCT;
    if (flags & XFS_PQUOTA_ACCT)
        uflags |= FS_QUOTA_PDQ_ACCT;
    if (flags & XFS_GQUOTA_ACCT)
        uflags |= FS_QUOTA_GDQ_ACCT;
    if (flags & XFS_UQUOTA_ENFD)
        uflags |= FS_QUOTA_UDQ_ENFD;
    if (flags & (XFS_OQUOTA_ENFD)) {
        uflags |= (flags & XFS_GQUOTA_ACCT) ?
            FS_QUOTA_GDQ_ENFD : FS_QUOTA_PDQ_ENFD;
    }
    return (uflags);
}


STATIC int
xfs_dqrele_inode(
    struct xfs_inode    *ip,
    struct xfs_perag    *pag,
    int         flags)
{
    /* skip quota inodes */
    if (ip == ip->i_mount->m_quotainfo->qi_uquotaip ||
        ip == ip->i_mount->m_quotainfo->qi_gquotaip) {
        ASSERT(ip->i_udquot == NULL);
        ASSERT(ip->i_gdquot == NULL);
        return 0;
    }

    xfs_ilock(ip, XFS_ILOCK_EXCL);
    if ((flags & XFS_UQUOTA_ACCT) && ip->i_udquot) {
        xfs_qm_dqrele(ip->i_udquot);
        ip->i_udquot = NULL;
    }
    if (flags & (XFS_PQUOTA_ACCT|XFS_GQUOTA_ACCT) && ip->i_gdquot) {
        xfs_qm_dqrele(ip->i_gdquot);
        ip->i_gdquot = NULL;
    }
    xfs_iunlock(ip, XFS_ILOCK_EXCL);
    return 0;
}


/*
 * Go thru all the inodes in the file system, releasing their dquots.
 *
 * Note that the mount structure gets modified to indicate that quotas are off
 * AFTER this, in the case of quotaoff.
 */
void
xfs_qm_dqrele_all_inodes(
    struct xfs_mount *mp,
    uint         flags)
{
    ASSERT(mp->m_quotainfo);
    xfs_inode_ag_iterator(mp, xfs_dqrele_inode, flags);
}