fs/xfs/xfs_qm_bhv.c

   1 /*
   2  * Copyright (c) 2000-2006 Silicon Graphics, Inc.
   3  * All Rights Reserved.
   4  *
   5  * This program is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU General Public License as
   7  * published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope that it would be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write the Free Software Foundation,
  16  * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  17  */
  18 #include "xfs.h"
  19 #include "xfs_fs.h"
  20 #include "xfs_format.h"
  21 #include "xfs_log_format.h"
  22 #include "xfs_trans_resv.h"
  23 #include "xfs_sb.h"
  24 #include "xfs_quota.h"
  25 #include "xfs_mount.h"
  26 #include "xfs_inode.h"
  27 #include "xfs_error.h"
  28 #include "xfs_trans.h"
  29 #include "xfs_qm.h"
  30
  31
  32 STATIC void
  33 xfs_fill_statvfs_from_dquot(
  34         struct kstatfs          *statp,
  35         struct xfs_dquot        *dqp)
  36 {
  37         __uint64_t              limit;
  38
  39         limit = dqp->q_core.d_blk_softlimit ?
  40                 be64_to_cpu(dqp->q_core.d_blk_softlimit) :
  41                 be64_to_cpu(dqp->q_core.d_blk_hardlimit);
  42         if (limit && statp->f_blocks > limit) {
  43                 statp->f_blocks = limit;
  44                 statp->f_bfree = statp->f_bavail =
  45                         (statp->f_blocks > dqp->q_res_bcount) ?
  46                          (statp->f_blocks - dqp->q_res_bcount) : 0;
  47         }
  48
  49         limit = dqp->q_core.d_ino_softlimit ?
  50                 be64_to_cpu(dqp->q_core.d_ino_softlimit) :
  51                 be64_to_cpu(dqp->q_core.d_ino_hardlimit);
  52         if (limit && statp->f_files > limit) {
  53                 statp->f_files = limit;
  54                 statp->f_ffree =
  55                         (statp->f_files > dqp->q_res_icount) ?
  56                          (statp->f_ffree - dqp->q_res_icount) : 0;
  57         }
  58 }
  59
  60
  61 /*
  62  * Directory tree accounting is implemented using project quotas, where
  63  * the project identifier is inherited from parent directories.
  64  * A statvfs (df, etc.) of a directory that is using project quota should
  65  * return a statvfs of the project, not the entire filesystem.
  66  * This makes such trees appear as if they are filesystems in themselves.
  67  */
  68 void
  69 xfs_qm_statvfs(
  70         xfs_inode_t             *ip,
  71         struct kstatfs          *statp)
  72 {
  73         xfs_mount_t             *mp = ip->i_mount;
  74         xfs_dquot_t             *dqp;
  75
  76         if (!xfs_qm_dqget(mp, NULL, xfs_get_projid(ip), XFS_DQ_PROJ, 0, &dqp)) {
  77                 xfs_fill_statvfs_from_dquot(statp, dqp);
  78                 xfs_qm_dqput(dqp);
  79         }
  80 }
  81
  82 int
  83 xfs_qm_newmount(
  84         xfs_mount_t     *mp,
  85         uint            *needquotamount,
  86         uint            *quotaflags)
  87 {
  88         uint            quotaondisk;
  89         uint            uquotaondisk = 0, gquotaondisk = 0, pquotaondisk = 0;
  90
  91         quotaondisk = xfs_sb_version_hasquota(&mp->m_sb) &&
  92                                 (mp->m_sb.sb_qflags & XFS_ALL_QUOTA_ACCT);
  93
  94         if (quotaondisk) {
  95                 uquotaondisk = mp->m_sb.sb_qflags & XFS_UQUOTA_ACCT;
  96                 pquotaondisk = mp->m_sb.sb_qflags & XFS_PQUOTA_ACCT;
  97                 gquotaondisk = mp->m_sb.sb_qflags & XFS_GQUOTA_ACCT;
  98         }
  99
 100         /*
 101          * If the device itself is read-only, we can't allow
 102          * the user to change the state of quota on the mount -
 103          * this would generate a transaction on the ro device,
 104          * which would lead to an I/O error and shutdown
 105          */
 106
 107         if (((uquotaondisk && !XFS_IS_UQUOTA_ON(mp)) ||
 108             (!uquotaondisk &&  XFS_IS_UQUOTA_ON(mp)) ||
 109              (gquotaondisk && !XFS_IS_GQUOTA_ON(mp)) ||
 110             (!gquotaondisk &&  XFS_IS_GQUOTA_ON(mp)) ||
 111              (pquotaondisk && !XFS_IS_PQUOTA_ON(mp)) ||
 112             (!pquotaondisk &&  XFS_IS_PQUOTA_ON(mp)))  &&
 113             xfs_dev_is_read_only(mp, "changing quota state")) {
 114                 xfs_warn(mp, "please mount with%s%s%s%s.",
 115                         (!quotaondisk ? "out quota" : ""),
 116                         (uquotaondisk ? " usrquota" : ""),
 117                         (gquotaondisk ? " grpquota" : ""),
 118                         (pquotaondisk ? " prjquota" : ""));
 119                 return -EPERM;
 120         }
 121
 122         if (XFS_IS_QUOTA_ON(mp) || quotaondisk) {
 123                 /*
 124                  * Call mount_quotas at this point only if we won't have to do
 125                  * a quotacheck.
 126                  */
 127                 if (quotaondisk && !XFS_QM_NEED_QUOTACHECK(mp)) {
 128                         /*
 129                          * If an error occurred, qm_mount_quotas code
 130                          * has already disabled quotas. So, just finish
 131                          * mounting, and get on with the boring life
 132                          * without disk quotas.
 133                          */
 134                         xfs_qm_mount_quotas(mp);
 135                 } else {
 136                         /*
 137                          * Clear the quota flags, but remember them. This
 138                          * is so that the quota code doesn't get invoked
 139                          * before we're ready. This can happen when an
 140                          * inode goes inactive and wants to free blocks,
 141                          * or via xfs_log_mount_finish.
 142                          */
 143                         *needquotamount = true;
 144                         *quotaflags = mp->m_qflags;
 145                         mp->m_qflags = 0;
 146                 }
 147         }
 148
 149         return 0;
 150 }