HID: hiddev: Fix slab-out-of-bounds write in hiddev_ioctl_usage()

[linux/fpc-iii.git] / fs / xfs / xfs_trans_dquot.c

/*
 * Copyright (c) 2000-2002 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 "xfs.h"
#include "xfs_fs.h"
#include "xfs_shared.h"
#include "xfs_format.h"
#include "xfs_log_format.h"
#include "xfs_trans_resv.h"
#include "xfs_mount.h"
#include "xfs_inode.h"
#include "xfs_error.h"
#include "xfs_trans.h"
#include "xfs_trans_priv.h"
#include "xfs_quota.h"
#include "xfs_qm.h"

STATIC void     xfs_trans_alloc_dqinfo(xfs_trans_t *);

/*
 * Add the locked dquot to the transaction.
 * The dquot must be locked, and it cannot be associated with any
 * transaction.
 */
void
xfs_trans_dqjoin(
        xfs_trans_t     *tp,
        xfs_dquot_t     *dqp)
{
        ASSERT(dqp->q_transp != tp);
        ASSERT(XFS_DQ_IS_LOCKED(dqp));
        ASSERT(dqp->q_logitem.qli_dquot == dqp);

        /*
         * Get a log_item_desc to point at the new item.
         */
        xfs_trans_add_item(tp, &dqp->q_logitem.qli_item);

        /*
         * Initialize d_transp so we can later determine if this dquot is
         * associated with this transaction.
         */
        dqp->q_transp = tp;
}


/*
 * This is called to mark the dquot as needing
 * to be logged when the transaction is committed.  The dquot must
 * already be associated with the given transaction.
 * Note that it marks the entire transaction as dirty. In the ordinary
 * case, this gets called via xfs_trans_commit, after the transaction
 * is already dirty. However, there's nothing stop this from getting
 * called directly, as done by xfs_qm_scall_setqlim. Hence, the TRANS_DIRTY
 * flag.
 */
void
xfs_trans_log_dquot(
        xfs_trans_t     *tp,
        xfs_dquot_t     *dqp)
{
        ASSERT(dqp->q_transp == tp);
        ASSERT(XFS_DQ_IS_LOCKED(dqp));

        tp->t_flags |= XFS_TRANS_DIRTY;
        dqp->q_logitem.qli_item.li_desc->lid_flags |= XFS_LID_DIRTY;
}

/*
 * Carry forward whatever is left of the quota blk reservation to
 * the spanky new transaction
 */
void
xfs_trans_dup_dqinfo(
        xfs_trans_t     *otp,
        xfs_trans_t     *ntp)
{
        xfs_dqtrx_t     *oq, *nq;
        int             i, j;
        xfs_dqtrx_t     *oqa, *nqa;
        ulong           blk_res_used;

        if (!otp->t_dqinfo)
                return;

        xfs_trans_alloc_dqinfo(ntp);

        /*
         * Because the quota blk reservation is carried forward,
         * it is also necessary to carry forward the DQ_DIRTY flag.
         */
        if (otp->t_flags & XFS_TRANS_DQ_DIRTY)
                ntp->t_flags |= XFS_TRANS_DQ_DIRTY;

        for (j = 0; j < XFS_QM_TRANS_DQTYPES; j++) {
                oqa = otp->t_dqinfo->dqs[j];
                nqa = ntp->t_dqinfo->dqs[j];
                for (i = 0; i < XFS_QM_TRANS_MAXDQS; i++) {
                        blk_res_used = 0;

                        if (oqa[i].qt_dquot == NULL)
                                break;
                        oq = &oqa[i];
                        nq = &nqa[i];

                        if (oq->qt_blk_res && oq->qt_bcount_delta > 0)
                                blk_res_used = oq->qt_bcount_delta;

                        nq->qt_dquot = oq->qt_dquot;
                        nq->qt_bcount_delta = nq->qt_icount_delta = 0;
                        nq->qt_rtbcount_delta = 0;

                        /*
                         * Transfer whatever is left of the reservations.
                         */
                        nq->qt_blk_res = oq->qt_blk_res - blk_res_used;
                        oq->qt_blk_res = blk_res_used;

                        nq->qt_rtblk_res = oq->qt_rtblk_res -
                                oq->qt_rtblk_res_used;
                        oq->qt_rtblk_res = oq->qt_rtblk_res_used;

                        nq->qt_ino_res = oq->qt_ino_res - oq->qt_ino_res_used;
                        oq->qt_ino_res = oq->qt_ino_res_used;

                }
        }
}

/*
 * Wrap around mod_dquot to account for both user and group quotas.
 */
void
xfs_trans_mod_dquot_byino(
        xfs_trans_t     *tp,
        xfs_inode_t     *ip,
        uint            field,
        long            delta)
{
        xfs_mount_t     *mp = tp->t_mountp;

        if (!XFS_IS_QUOTA_RUNNING(mp) ||
            !XFS_IS_QUOTA_ON(mp) ||
            xfs_is_quota_inode(&mp->m_sb, ip->i_ino))
                return;

        if (tp->t_dqinfo == NULL)
                xfs_trans_alloc_dqinfo(tp);

        if (XFS_IS_UQUOTA_ON(mp) && ip->i_udquot)
                (void) xfs_trans_mod_dquot(tp, ip->i_udquot, field, delta);
        if (XFS_IS_GQUOTA_ON(mp) && ip->i_gdquot)
                (void) xfs_trans_mod_dquot(tp, ip->i_gdquot, field, delta);
        if (XFS_IS_PQUOTA_ON(mp) && ip->i_pdquot)
                (void) xfs_trans_mod_dquot(tp, ip->i_pdquot, field, delta);
}

STATIC struct xfs_dqtrx *
xfs_trans_get_dqtrx(
        struct xfs_trans        *tp,
        struct xfs_dquot        *dqp)
{
        int                     i;
        struct xfs_dqtrx        *qa;

        if (XFS_QM_ISUDQ(dqp))
                qa = tp->t_dqinfo->dqs[XFS_QM_TRANS_USR];
        else if (XFS_QM_ISGDQ(dqp))
                qa = tp->t_dqinfo->dqs[XFS_QM_TRANS_GRP];
        else if (XFS_QM_ISPDQ(dqp))
                qa = tp->t_dqinfo->dqs[XFS_QM_TRANS_PRJ];
        else
                return NULL;

        for (i = 0; i < XFS_QM_TRANS_MAXDQS; i++) {
                if (qa[i].qt_dquot == NULL ||
                    qa[i].qt_dquot == dqp)
                        return &qa[i];
        }

        return NULL;
}

/*
 * Make the changes in the transaction structure.
 * The moral equivalent to xfs_trans_mod_sb().
 * We don't touch any fields in the dquot, so we don't care
 * if it's locked or not (most of the time it won't be).
 */
void
xfs_trans_mod_dquot(
        xfs_trans_t     *tp,
        xfs_dquot_t     *dqp,
        uint            field,
        long            delta)
{
        xfs_dqtrx_t     *qtrx;

        ASSERT(tp);
        ASSERT(XFS_IS_QUOTA_RUNNING(tp->t_mountp));
        qtrx = NULL;

        if (tp->t_dqinfo == NULL)
                xfs_trans_alloc_dqinfo(tp);
        /*
         * Find either the first free slot or the slot that belongs
         * to this dquot.
         */
        qtrx = xfs_trans_get_dqtrx(tp, dqp);
        ASSERT(qtrx);
        if (qtrx->qt_dquot == NULL)
                qtrx->qt_dquot = dqp;

        switch (field) {

                /*
                 * regular disk blk reservation
                 */
              case XFS_TRANS_DQ_RES_BLKS:
                qtrx->qt_blk_res += (ulong)delta;
                break;

                /*
                 * inode reservation
                 */
              case XFS_TRANS_DQ_RES_INOS:
                qtrx->qt_ino_res += (ulong)delta;
                break;

                /*
                 * disk blocks used.
                 */
              case XFS_TRANS_DQ_BCOUNT:
                qtrx->qt_bcount_delta += delta;
                break;

              case XFS_TRANS_DQ_DELBCOUNT:
                qtrx->qt_delbcnt_delta += delta;
                break;

                /*
                 * Inode Count
                 */
              case XFS_TRANS_DQ_ICOUNT:
                if (qtrx->qt_ino_res && delta > 0) {
                        qtrx->qt_ino_res_used += (ulong)delta;
                        ASSERT(qtrx->qt_ino_res >= qtrx->qt_ino_res_used);
                }
                qtrx->qt_icount_delta += delta;
                break;

                /*
                 * rtblk reservation
                 */
              case XFS_TRANS_DQ_RES_RTBLKS:
                qtrx->qt_rtblk_res += (ulong)delta;
                break;

                /*
                 * rtblk count
                 */
              case XFS_TRANS_DQ_RTBCOUNT:
                if (qtrx->qt_rtblk_res && delta > 0) {
                        qtrx->qt_rtblk_res_used += (ulong)delta;
                        ASSERT(qtrx->qt_rtblk_res >= qtrx->qt_rtblk_res_used);
                }
                qtrx->qt_rtbcount_delta += delta;
                break;

              case XFS_TRANS_DQ_DELRTBCOUNT:
                qtrx->qt_delrtb_delta += delta;
                break;

              default:
                ASSERT(0);
        }
        tp->t_flags |= XFS_TRANS_DQ_DIRTY;
}


/*
 * Given an array of dqtrx structures, lock all the dquots associated and join
 * them to the transaction, provided they have been modified.  We know that the
 * highest number of dquots of one type - usr, grp and prj - involved in a
 * transaction is 3 so we don't need to make this very generic.
 */
STATIC void
xfs_trans_dqlockedjoin(
        xfs_trans_t     *tp,
        xfs_dqtrx_t     *q)
{
        ASSERT(q[0].qt_dquot != NULL);
        if (q[1].qt_dquot == NULL) {
                xfs_dqlock(q[0].qt_dquot);
                xfs_trans_dqjoin(tp, q[0].qt_dquot);
        } else {
                ASSERT(XFS_QM_TRANS_MAXDQS == 2);
                xfs_dqlock2(q[0].qt_dquot, q[1].qt_dquot);
                xfs_trans_dqjoin(tp, q[0].qt_dquot);
                xfs_trans_dqjoin(tp, q[1].qt_dquot);
        }
}


/*
 * Called by xfs_trans_commit() and similar in spirit to
 * xfs_trans_apply_sb_deltas().
 * Go thru all the dquots belonging to this transaction and modify the
 * INCORE dquot to reflect the actual usages.
 * Unreserve just the reservations done by this transaction.
 * dquot is still left locked at exit.
 */
void
xfs_trans_apply_dquot_deltas(
        struct xfs_trans        *tp)
{
        int                     i, j;
        struct xfs_dquot        *dqp;
        struct xfs_dqtrx        *qtrx, *qa;
        struct xfs_disk_dquot   *d;
        long                    totalbdelta;
        long                    totalrtbdelta;

        if (!(tp->t_flags & XFS_TRANS_DQ_DIRTY))
                return;

        ASSERT(tp->t_dqinfo);
        for (j = 0; j < XFS_QM_TRANS_DQTYPES; j++) {
                qa = tp->t_dqinfo->dqs[j];
                if (qa[0].qt_dquot == NULL)
                        continue;

                /*
                 * Lock all of the dquots and join them to the transaction.
                 */
                xfs_trans_dqlockedjoin(tp, qa);

                for (i = 0; i < XFS_QM_TRANS_MAXDQS; i++) {
                        qtrx = &qa[i];
                        /*
                         * The array of dquots is filled
                         * sequentially, not sparsely.
                         */
                        if ((dqp = qtrx->qt_dquot) == NULL)
                                break;

                        ASSERT(XFS_DQ_IS_LOCKED(dqp));
                        ASSERT(dqp->q_transp == tp);

                        /*
                         * adjust the actual number of blocks used
                         */
                        d = &dqp->q_core;

                        /*
                         * The issue here is - sometimes we don't make a blkquota
                         * reservation intentionally to be fair to users
                         * (when the amount is small). On the other hand,
                         * delayed allocs do make reservations, but that's
                         * outside of a transaction, so we have no
                         * idea how much was really reserved.
                         * So, here we've accumulated delayed allocation blks and
                         * non-delay blks. The assumption is that the
                         * delayed ones are always reserved (outside of a
                         * transaction), and the others may or may not have
                         * quota reservations.
                         */
                        totalbdelta = qtrx->qt_bcount_delta +
                                qtrx->qt_delbcnt_delta;
                        totalrtbdelta = qtrx->qt_rtbcount_delta +
                                qtrx->qt_delrtb_delta;
#ifdef DEBUG
                        if (totalbdelta < 0)
                                ASSERT(be64_to_cpu(d->d_bcount) >=
                                       -totalbdelta);

                        if (totalrtbdelta < 0)
                                ASSERT(be64_to_cpu(d->d_rtbcount) >=
                                       -totalrtbdelta);

                        if (qtrx->qt_icount_delta < 0)
                                ASSERT(be64_to_cpu(d->d_icount) >=
                                       -qtrx->qt_icount_delta);
#endif
                        if (totalbdelta)
                                be64_add_cpu(&d->d_bcount, (xfs_qcnt_t)totalbdelta);

                        if (qtrx->qt_icount_delta)
                                be64_add_cpu(&d->d_icount, (xfs_qcnt_t)qtrx->qt_icount_delta);

                        if (totalrtbdelta)
                                be64_add_cpu(&d->d_rtbcount, (xfs_qcnt_t)totalrtbdelta);

                        /*
                         * Get any default limits in use.
                         * Start/reset the timer(s) if needed.
                         */
                        if (d->d_id) {
                                xfs_qm_adjust_dqlimits(tp->t_mountp, dqp);
                                xfs_qm_adjust_dqtimers(tp->t_mountp, d);
                        }

                        dqp->dq_flags |= XFS_DQ_DIRTY;
                        /*
                         * add this to the list of items to get logged
                         */
                        xfs_trans_log_dquot(tp, dqp);
                        /*
                         * Take off what's left of the original reservation.
                         * In case of delayed allocations, there's no
                         * reservation that a transaction structure knows of.
                         */
                        if (qtrx->qt_blk_res != 0) {
                                ulong blk_res_used = 0;

                                if (qtrx->qt_bcount_delta > 0)
                                        blk_res_used = qtrx->qt_bcount_delta;

                                if (qtrx->qt_blk_res != blk_res_used) {
                                        if (qtrx->qt_blk_res > blk_res_used)
                                                dqp->q_res_bcount -= (xfs_qcnt_t)
                                                        (qtrx->qt_blk_res -
                                                         blk_res_used);
                                        else
                                                dqp->q_res_bcount -= (xfs_qcnt_t)
                                                        (blk_res_used -
                                                         qtrx->qt_blk_res);
                                }
                        } else {
                                /*
                                 * These blks were never reserved, either inside
                                 * a transaction or outside one (in a delayed
                                 * allocation). Also, this isn't always a
                                 * negative number since we sometimes
                                 * deliberately skip quota reservations.
                                 */
                                if (qtrx->qt_bcount_delta) {
                                        dqp->q_res_bcount +=
                                              (xfs_qcnt_t)qtrx->qt_bcount_delta;
                                }
                        }
                        /*
                         * Adjust the RT reservation.
                         */
                        if (qtrx->qt_rtblk_res != 0) {
                                if (qtrx->qt_rtblk_res != qtrx->qt_rtblk_res_used) {
                                        if (qtrx->qt_rtblk_res >
                                            qtrx->qt_rtblk_res_used)
                                               dqp->q_res_rtbcount -= (xfs_qcnt_t)
                                                       (qtrx->qt_rtblk_res -
                                                        qtrx->qt_rtblk_res_used);
                                        else
                                               dqp->q_res_rtbcount -= (xfs_qcnt_t)
                                                       (qtrx->qt_rtblk_res_used -
                                                        qtrx->qt_rtblk_res);
                                }
                        } else {
                                if (qtrx->qt_rtbcount_delta)
                                        dqp->q_res_rtbcount +=
                                            (xfs_qcnt_t)qtrx->qt_rtbcount_delta;
                        }

                        /*
                         * Adjust the inode reservation.
                         */
                        if (qtrx->qt_ino_res != 0) {
                                ASSERT(qtrx->qt_ino_res >=
                                       qtrx->qt_ino_res_used);
                                if (qtrx->qt_ino_res > qtrx->qt_ino_res_used)
                                        dqp->q_res_icount -= (xfs_qcnt_t)
                                                (qtrx->qt_ino_res -
                                                 qtrx->qt_ino_res_used);
                        } else {
                                if (qtrx->qt_icount_delta)
                                        dqp->q_res_icount +=
                                            (xfs_qcnt_t)qtrx->qt_icount_delta;
                        }

                        ASSERT(dqp->q_res_bcount >=
                                be64_to_cpu(dqp->q_core.d_bcount));
                        ASSERT(dqp->q_res_icount >=
                                be64_to_cpu(dqp->q_core.d_icount));
                        ASSERT(dqp->q_res_rtbcount >=
                                be64_to_cpu(dqp->q_core.d_rtbcount));
                }
        }
}

/*
 * Release the reservations, and adjust the dquots accordingly.
 * This is called only when the transaction is being aborted. If by
 * any chance we have done dquot modifications incore (ie. deltas) already,
 * we simply throw those away, since that's the expected behavior
 * when a transaction is curtailed without a commit.
 */
void
xfs_trans_unreserve_and_mod_dquots(
        xfs_trans_t             *tp)
{
        int                     i, j;
        xfs_dquot_t             *dqp;
        xfs_dqtrx_t             *qtrx, *qa;
        bool                    locked;

        if (!tp->t_dqinfo || !(tp->t_flags & XFS_TRANS_DQ_DIRTY))
                return;

        for (j = 0; j < XFS_QM_TRANS_DQTYPES; j++) {
                qa = tp->t_dqinfo->dqs[j];

                for (i = 0; i < XFS_QM_TRANS_MAXDQS; i++) {
                        qtrx = &qa[i];
                        /*
                         * We assume that the array of dquots is filled
                         * sequentially, not sparsely.
                         */
                        if ((dqp = qtrx->qt_dquot) == NULL)
                                break;
                        /*
                         * Unreserve the original reservation. We don't care
                         * about the number of blocks used field, or deltas.
                         * Also we don't bother to zero the fields.
                         */
                        locked = false;
                        if (qtrx->qt_blk_res) {
                                xfs_dqlock(dqp);
                                locked = true;
                                dqp->q_res_bcount -=
                                        (xfs_qcnt_t)qtrx->qt_blk_res;
                        }
                        if (qtrx->qt_ino_res) {
                                if (!locked) {
                                        xfs_dqlock(dqp);
                                        locked = true;
                                }
                                dqp->q_res_icount -=
                                        (xfs_qcnt_t)qtrx->qt_ino_res;
                        }

                        if (qtrx->qt_rtblk_res) {
                                if (!locked) {
                                        xfs_dqlock(dqp);
                                        locked = true;
                                }
                                dqp->q_res_rtbcount -=
                                        (xfs_qcnt_t)qtrx->qt_rtblk_res;
                        }
                        if (locked)
                                xfs_dqunlock(dqp);

                }
        }
}

STATIC void
xfs_quota_warn(
        struct xfs_mount        *mp,
        struct xfs_dquot        *dqp,
        int                     type)
{
        /* no warnings for project quotas - we just return ENOSPC later */
        if (dqp->dq_flags & XFS_DQ_PROJ)
                return;
        quota_send_warning(make_kqid(&init_user_ns,
                                     (dqp->dq_flags & XFS_DQ_USER) ?
                                     USRQUOTA : GRPQUOTA,
                                     be32_to_cpu(dqp->q_core.d_id)),
                           mp->m_super->s_dev, type);
}

/*
 * This reserves disk blocks and inodes against a dquot.
 * Flags indicate if the dquot is to be locked here and also
 * if the blk reservation is for RT or regular blocks.
 * Sending in XFS_QMOPT_FORCE_RES flag skips the quota check.
 */
STATIC int
xfs_trans_dqresv(
        xfs_trans_t     *tp,
        xfs_mount_t     *mp,
        xfs_dquot_t     *dqp,
        long            nblks,
        long            ninos,
        uint            flags)
{
        xfs_qcnt_t      hardlimit;
        xfs_qcnt_t      softlimit;
        time_t          timer;
        xfs_qwarncnt_t  warns;
        xfs_qwarncnt_t  warnlimit;
        xfs_qcnt_t      total_count;
        xfs_qcnt_t      *resbcountp;
        xfs_quotainfo_t *q = mp->m_quotainfo;


        xfs_dqlock(dqp);

        if (flags & XFS_TRANS_DQ_RES_BLKS) {
                hardlimit = be64_to_cpu(dqp->q_core.d_blk_hardlimit);
                if (!hardlimit)
                        hardlimit = q->qi_bhardlimit;
                softlimit = be64_to_cpu(dqp->q_core.d_blk_softlimit);
                if (!softlimit)
                        softlimit = q->qi_bsoftlimit;
                timer = be32_to_cpu(dqp->q_core.d_btimer);
                warns = be16_to_cpu(dqp->q_core.d_bwarns);
                warnlimit = dqp->q_mount->m_quotainfo->qi_bwarnlimit;
                resbcountp = &dqp->q_res_bcount;
        } else {
                ASSERT(flags & XFS_TRANS_DQ_RES_RTBLKS);
                hardlimit = be64_to_cpu(dqp->q_core.d_rtb_hardlimit);
                if (!hardlimit)
                        hardlimit = q->qi_rtbhardlimit;
                softlimit = be64_to_cpu(dqp->q_core.d_rtb_softlimit);
                if (!softlimit)
                        softlimit = q->qi_rtbsoftlimit;
                timer = be32_to_cpu(dqp->q_core.d_rtbtimer);
                warns = be16_to_cpu(dqp->q_core.d_rtbwarns);
                warnlimit = dqp->q_mount->m_quotainfo->qi_rtbwarnlimit;
                resbcountp = &dqp->q_res_rtbcount;
        }

        if ((flags & XFS_QMOPT_FORCE_RES) == 0 &&
            dqp->q_core.d_id &&
            ((XFS_IS_UQUOTA_ENFORCED(dqp->q_mount) && XFS_QM_ISUDQ(dqp)) ||
             (XFS_IS_GQUOTA_ENFORCED(dqp->q_mount) && XFS_QM_ISGDQ(dqp)) ||
             (XFS_IS_PQUOTA_ENFORCED(dqp->q_mount) && XFS_QM_ISPDQ(dqp)))) {
                if (nblks > 0) {
                        /*
                         * dquot is locked already. See if we'd go over the
                         * hardlimit or exceed the timelimit if we allocate
                         * nblks.
                         */
                        total_count = *resbcountp + nblks;
                        if (hardlimit && total_count > hardlimit) {
                                xfs_quota_warn(mp, dqp, QUOTA_NL_BHARDWARN);
                                goto error_return;
                        }
                        if (softlimit && total_count > softlimit) {
                                if ((timer != 0 && get_seconds() > timer) ||
                                    (warns != 0 && warns >= warnlimit)) {
                                        xfs_quota_warn(mp, dqp,
                                                       QUOTA_NL_BSOFTLONGWARN);
                                        goto error_return;
                                }

                                xfs_quota_warn(mp, dqp, QUOTA_NL_BSOFTWARN);
                        }
                }
                if (ninos > 0) {
                        total_count = dqp->q_res_icount + ninos;
                        timer = be32_to_cpu(dqp->q_core.d_itimer);
                        warns = be16_to_cpu(dqp->q_core.d_iwarns);
                        warnlimit = dqp->q_mount->m_quotainfo->qi_iwarnlimit;
                        hardlimit = be64_to_cpu(dqp->q_core.d_ino_hardlimit);
                        if (!hardlimit)
                                hardlimit = q->qi_ihardlimit;
                        softlimit = be64_to_cpu(dqp->q_core.d_ino_softlimit);
                        if (!softlimit)
                                softlimit = q->qi_isoftlimit;

                        if (hardlimit && total_count > hardlimit) {
                                xfs_quota_warn(mp, dqp, QUOTA_NL_IHARDWARN);
                                goto error_return;
                        }
                        if (softlimit && total_count > softlimit) {
                                if  ((timer != 0 && get_seconds() > timer) ||
                                     (warns != 0 && warns >= warnlimit)) {
                                        xfs_quota_warn(mp, dqp,
                                                       QUOTA_NL_ISOFTLONGWARN);
                                        goto error_return;
                                }
                                xfs_quota_warn(mp, dqp, QUOTA_NL_ISOFTWARN);
                        }
                }
        }

        /*
         * Change the reservation, but not the actual usage.
         * Note that q_res_bcount = q_core.d_bcount + resv
         */
        (*resbcountp) += (xfs_qcnt_t)nblks;
        if (ninos != 0)
                dqp->q_res_icount += (xfs_qcnt_t)ninos;

        /*
         * note the reservation amt in the trans struct too,
         * so that the transaction knows how much was reserved by
         * it against this particular dquot.
         * We don't do this when we are reserving for a delayed allocation,
         * because we don't have the luxury of a transaction envelope then.
         */
        if (tp) {
                ASSERT(tp->t_dqinfo);
                ASSERT(flags & XFS_QMOPT_RESBLK_MASK);
                if (nblks != 0)
                        xfs_trans_mod_dquot(tp, dqp,
                                            flags & XFS_QMOPT_RESBLK_MASK,
                                            nblks);
                if (ninos != 0)
                        xfs_trans_mod_dquot(tp, dqp,
                                            XFS_TRANS_DQ_RES_INOS,
                                            ninos);
        }
        ASSERT(dqp->q_res_bcount >= be64_to_cpu(dqp->q_core.d_bcount));
        ASSERT(dqp->q_res_rtbcount >= be64_to_cpu(dqp->q_core.d_rtbcount));
        ASSERT(dqp->q_res_icount >= be64_to_cpu(dqp->q_core.d_icount));

        xfs_dqunlock(dqp);
        return 0;

error_return:
        xfs_dqunlock(dqp);
        if (flags & XFS_QMOPT_ENOSPC)
                return -ENOSPC;
        return -EDQUOT;
}


/*
 * Given dquot(s), make disk block and/or inode reservations against them.
 * The fact that this does the reservation against user, group and
 * project quotas is important, because this follows a all-or-nothing
 * approach.
 *
 * flags = XFS_QMOPT_FORCE_RES evades limit enforcement. Used by chown.
 *         XFS_QMOPT_ENOSPC returns ENOSPC not EDQUOT.  Used by pquota.
 *         XFS_TRANS_DQ_RES_BLKS reserves regular disk blocks
 *         XFS_TRANS_DQ_RES_RTBLKS reserves realtime disk blocks
 * dquots are unlocked on return, if they were not locked by caller.
 */
int
xfs_trans_reserve_quota_bydquots(
        struct xfs_trans        *tp,
        struct xfs_mount        *mp,
        struct xfs_dquot        *udqp,
        struct xfs_dquot        *gdqp,
        struct xfs_dquot        *pdqp,
        long                    nblks,
        long                    ninos,
        uint                    flags)
{
        int             error;

        if (!XFS_IS_QUOTA_RUNNING(mp) || !XFS_IS_QUOTA_ON(mp))
                return 0;

        if (tp && tp->t_dqinfo == NULL)
                xfs_trans_alloc_dqinfo(tp);

        ASSERT(flags & XFS_QMOPT_RESBLK_MASK);

        if (udqp) {
                error = xfs_trans_dqresv(tp, mp, udqp, nblks, ninos,
                                        (flags & ~XFS_QMOPT_ENOSPC));
                if (error)
                        return error;
        }

        if (gdqp) {
                error = xfs_trans_dqresv(tp, mp, gdqp, nblks, ninos, flags);
                if (error)
                        goto unwind_usr;
        }

        if (pdqp) {
                error = xfs_trans_dqresv(tp, mp, pdqp, nblks, ninos, flags);
                if (error)
                        goto unwind_grp;
        }

        /*
         * Didn't change anything critical, so, no need to log
         */
        return 0;

unwind_grp:
        flags |= XFS_QMOPT_FORCE_RES;
        if (gdqp)
                xfs_trans_dqresv(tp, mp, gdqp, -nblks, -ninos, flags);
unwind_usr:
        flags |= XFS_QMOPT_FORCE_RES;
        if (udqp)
                xfs_trans_dqresv(tp, mp, udqp, -nblks, -ninos, flags);
        return error;
}


/*
 * Lock the dquot and change the reservation if we can.
 * This doesn't change the actual usage, just the reservation.
 * The inode sent in is locked.
 */
int
xfs_trans_reserve_quota_nblks(
        struct xfs_trans        *tp,
        struct xfs_inode        *ip,
        long                    nblks,
        long                    ninos,
        uint                    flags)
{
        struct xfs_mount        *mp = ip->i_mount;

        if (!XFS_IS_QUOTA_RUNNING(mp) || !XFS_IS_QUOTA_ON(mp))
                return 0;
        if (XFS_IS_PQUOTA_ON(mp))
                flags |= XFS_QMOPT_ENOSPC;

        ASSERT(!xfs_is_quota_inode(&mp->m_sb, ip->i_ino));

        ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
        ASSERT((flags & ~(XFS_QMOPT_FORCE_RES | XFS_QMOPT_ENOSPC)) ==
                                XFS_TRANS_DQ_RES_RTBLKS ||
               (flags & ~(XFS_QMOPT_FORCE_RES | XFS_QMOPT_ENOSPC)) ==
                                XFS_TRANS_DQ_RES_BLKS);

        /*
         * Reserve nblks against these dquots, with trans as the mediator.
         */
        return xfs_trans_reserve_quota_bydquots(tp, mp,
                                                ip->i_udquot, ip->i_gdquot,
                                                ip->i_pdquot,
                                                nblks, ninos, flags);
}

/*
 * This routine is called to allocate a quotaoff log item.
 */
xfs_qoff_logitem_t *
xfs_trans_get_qoff_item(
        xfs_trans_t             *tp,
        xfs_qoff_logitem_t      *startqoff,
        uint                    flags)
{
        xfs_qoff_logitem_t      *q;

        ASSERT(tp != NULL);

        q = xfs_qm_qoff_logitem_init(tp->t_mountp, startqoff, flags);
        ASSERT(q != NULL);

        /*
         * Get a log_item_desc to point at the new item.
         */
        xfs_trans_add_item(tp, &q->qql_item);
        return q;
}


/*
 * This is called to mark the quotaoff logitem as needing
 * to be logged when the transaction is committed.  The logitem must
 * already be associated with the given transaction.
 */
void
xfs_trans_log_quotaoff_item(
        xfs_trans_t             *tp,
        xfs_qoff_logitem_t      *qlp)
{
        tp->t_flags |= XFS_TRANS_DIRTY;
        qlp->qql_item.li_desc->lid_flags |= XFS_LID_DIRTY;
}

STATIC void
xfs_trans_alloc_dqinfo(
        xfs_trans_t     *tp)
{
        tp->t_dqinfo = kmem_zone_zalloc(xfs_qm_dqtrxzone, KM_SLEEP);
}

void
xfs_trans_free_dqinfo(
        xfs_trans_t     *tp)
{
        if (!tp->t_dqinfo)
                return;
        kmem_zone_free(xfs_qm_dqtrxzone, tp->t_dqinfo);
        tp->t_dqinfo = NULL;
}