xfs_qm_bhv.c

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/*
 * Copyright (c) 2000-2006 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_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_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_qm.h"


STATIC void
xfs_fill_statvfs_from_dquot(
    struct kstatfs      *statp,
    struct xfs_dquot    *dqp)
{
    __uint64_t      limit;

    limit = dqp->q_core.d_blk_softlimit ?
        be64_to_cpu(dqp->q_core.d_blk_softlimit) :
        be64_to_cpu(dqp->q_core.d_blk_hardlimit);
    if (limit && statp->f_blocks > limit) {
        statp->f_blocks = limit;
        statp->f_bfree = statp->f_bavail =
            (statp->f_blocks > dqp->q_res_bcount) ?
             (statp->f_blocks - dqp->q_res_bcount) : 0;
    }

    limit = dqp->q_core.d_ino_softlimit ?
        be64_to_cpu(dqp->q_core.d_ino_softlimit) :
        be64_to_cpu(dqp->q_core.d_ino_hardlimit);
    if (limit && statp->f_files > limit) {
        statp->f_files = limit;
        statp->f_ffree =
            (statp->f_files > dqp->q_res_icount) ?
             (statp->f_ffree - dqp->q_res_icount) : 0;
    }
}


/*
 * Directory tree accounting is implemented using project quotas, where
 * the project identifier is inherited from parent directories.
 * A statvfs (df, etc.) of a directory that is using project quota should
 * return a statvfs of the project, not the entire filesystem.
 * This makes such trees appear as if they are filesystems in themselves.
 */
void
xfs_qm_statvfs(
    xfs_inode_t     *ip,
    struct kstatfs      *statp)
{
    xfs_mount_t     *mp = ip->i_mount;
    xfs_dquot_t     *dqp;

    if (!xfs_qm_dqget(mp, NULL, xfs_get_projid(ip), XFS_DQ_PROJ, 0, &dqp)) {
        xfs_fill_statvfs_from_dquot(statp, dqp);
        xfs_qm_dqput(dqp);
    }
}

int
xfs_qm_newmount(
    xfs_mount_t *mp,
    uint        *needquotamount,
    uint        *quotaflags)
{
    uint        quotaondisk;
    uint        uquotaondisk = 0, gquotaondisk = 0, pquotaondisk = 0;

    quotaondisk = xfs_sb_version_hasquota(&mp->m_sb) &&
                (mp->m_sb.sb_qflags & XFS_ALL_QUOTA_ACCT);

    if (quotaondisk) {
        uquotaondisk = mp->m_sb.sb_qflags & XFS_UQUOTA_ACCT;
        pquotaondisk = mp->m_sb.sb_qflags & XFS_PQUOTA_ACCT;
        gquotaondisk = mp->m_sb.sb_qflags & XFS_GQUOTA_ACCT;
    }

    /*
     * If the device itself is read-only, we can't allow
     * the user to change the state of quota on the mount -
     * this would generate a transaction on the ro device,
     * which would lead to an I/O error and shutdown
     */

    if (((uquotaondisk && !XFS_IS_UQUOTA_ON(mp)) ||
        (!uquotaondisk &&  XFS_IS_UQUOTA_ON(mp)) ||
         (pquotaondisk && !XFS_IS_PQUOTA_ON(mp)) ||
        (!pquotaondisk &&  XFS_IS_PQUOTA_ON(mp)) ||
         (gquotaondisk && !XFS_IS_GQUOTA_ON(mp)) ||
        (!gquotaondisk &&  XFS_IS_OQUOTA_ON(mp)))  &&
        xfs_dev_is_read_only(mp, "changing quota state")) {
        xfs_warn(mp, "please mount with%s%s%s%s.",
            (!quotaondisk ? "out quota" : ""),
            (uquotaondisk ? " usrquota" : ""),
            (pquotaondisk ? " prjquota" : ""),
            (gquotaondisk ? " grpquota" : ""));
        return XFS_ERROR(EPERM);
    }

    if (XFS_IS_QUOTA_ON(mp) || quotaondisk) {
        /*
         * Call mount_quotas at this point only if we won't have to do
         * a quotacheck.
         */
        if (quotaondisk && !XFS_QM_NEED_QUOTACHECK(mp)) {
            /*
             * If an error occurred, qm_mount_quotas code
             * has already disabled quotas. So, just finish
             * mounting, and get on with the boring life
             * without disk quotas.
             */
            xfs_qm_mount_quotas(mp);
        } else {
            /*
             * Clear the quota flags, but remember them. This
             * is so that the quota code doesn't get invoked
             * before we're ready. This can happen when an
             * inode goes inactive and wants to free blocks,
             * or via xfs_log_mount_finish.
             */
            *needquotamount = B_TRUE;
            *quotaflags = mp->m_qflags;
            mp->m_qflags = 0;
        }
    }

    return 0;
}