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.h"
  22 #include "xfs_trans.h"
  23 #include "xfs_sb.h"
  24 #include "xfs_ag.h"
  25 #include "xfs_alloc.h"
  26 #include "xfs_quota.h"
  27 #include "xfs_mount.h"
  28 #include "xfs_bmap_btree.h"
  29 #include "xfs_inode.h"
  30 #include "xfs_itable.h"
  31 #include "xfs_bmap.h"
  32 #include "xfs_rtalloc.h"
  33 #include "xfs_error.h"
  34 #include "xfs_attr.h"
  35 #include "xfs_buf_item.h"
  36 #include "xfs_qm.h"
  37
  38
  39 STATIC void
  40 xfs_fill_statvfs_from_dquot(
  41         struct kstatfs          *statp,
  42         struct xfs_dquot        *dqp)
  43 {
  44         __uint64_t              limit;
  45
  46         limit = dqp->q_core.d_blk_softlimit ?
  47                 be64_to_cpu(dqp->q_core.d_blk_softlimit) :
  48                 be64_to_cpu(dqp->q_core.d_blk_hardlimit);
  49         if (limit && statp->f_blocks > limit) {
  50                 statp->f_blocks = limit;
  51                 statp->f_bfree = statp->f_bavail =
  52                         (statp->f_blocks > dqp->q_res_bcount) ?
  53                          (statp->f_blocks - dqp->q_res_bcount) : 0;
  54         }
  55
  56         limit = dqp->q_core.d_ino_softlimit ?
  57                 be64_to_cpu(dqp->q_core.d_ino_softlimit) :
  58                 be64_to_cpu(dqp->q_core.d_ino_hardlimit);
  59         if (limit && statp->f_files > limit) {
  60                 statp->f_files = limit;
  61                 statp->f_ffree =
  62                         (statp->f_files > dqp->q_res_icount) ?
  63                          (statp->f_ffree - dqp->q_res_icount) : 0;
  64         }
  65 }
  66
  67
  68 /*
  69  * Directory tree accounting is implemented using project quotas, where
  70  * the project identifier is inherited from parent directories.
  71  * A statvfs (df, etc.) of a directory that is using project quota should
  72  * return a statvfs of the project, not the entire filesystem.
  73  * This makes such trees appear as if they are filesystems in themselves.
  74  */
  75 void
  76 xfs_qm_statvfs(
  77         xfs_inode_t             *ip,
  78         struct kstatfs          *statp)
  79 {
  80         xfs_mount_t             *mp = ip->i_mount;
  81         xfs_dquot_t             *dqp;
  82
  83         if (!xfs_qm_dqget(mp, NULL, xfs_get_projid(ip), XFS_DQ_PROJ, 0, &dqp)) {
  84                 xfs_fill_statvfs_from_dquot(statp, dqp);
  85                 xfs_qm_dqput(dqp);
  86         }
  87 }
  88
  89 int
  90 xfs_qm_newmount(
  91         xfs_mount_t     *mp,
  92         uint            *needquotamount,
  93         uint            *quotaflags)
  94 {
  95         uint            quotaondisk;
  96         uint            uquotaondisk = 0, gquotaondisk = 0, pquotaondisk = 0;
  97
  98         quotaondisk = xfs_sb_version_hasquota(&mp->m_sb) &&
  99                                 (mp->m_sb.sb_qflags & XFS_ALL_QUOTA_ACCT);
 100
 101         if (quotaondisk) {
 102                 uquotaondisk = mp->m_sb.sb_qflags & XFS_UQUOTA_ACCT;
 103                 pquotaondisk = mp->m_sb.sb_qflags & XFS_PQUOTA_ACCT;
 104                 gquotaondisk = mp->m_sb.sb_qflags & XFS_GQUOTA_ACCT;
 105         }
 106
 107         /*
 108          * If the device itself is read-only, we can't allow
 109          * the user to change the state of quota on the mount -
 110          * this would generate a transaction on the ro device,
 111          * which would lead to an I/O error and shutdown
 112          */
 113
 114         if (((uquotaondisk && !XFS_IS_UQUOTA_ON(mp)) ||
 115             (!uquotaondisk &&  XFS_IS_UQUOTA_ON(mp)) ||
 116              (gquotaondisk && !XFS_IS_GQUOTA_ON(mp)) ||
 117             (!gquotaondisk &&  XFS_IS_GQUOTA_ON(mp)) ||
 118              (pquotaondisk && !XFS_IS_PQUOTA_ON(mp)) ||
 119             (!pquotaondisk &&  XFS_IS_PQUOTA_ON(mp)))  &&
 120             xfs_dev_is_read_only(mp, "changing quota state")) {
 121                 xfs_warn(mp, "please mount with%s%s%s%s.",
 122                         (!quotaondisk ? "out quota" : ""),
 123                         (uquotaondisk ? " usrquota" : ""),
 124                         (gquotaondisk ? " grpquota" : ""),
 125                         (pquotaondisk ? " prjquota" : ""));
 126                 return XFS_ERROR(EPERM);
 127         }
 128
 129         if (XFS_IS_QUOTA_ON(mp) || quotaondisk) {
 130                 /*
 131                  * Call mount_quotas at this point only if we won't have to do
 132                  * a quotacheck.
 133                  */
 134                 if (quotaondisk && !XFS_QM_NEED_QUOTACHECK(mp)) {
 135                         /*
 136                          * If an error occurred, qm_mount_quotas code
 137                          * has already disabled quotas. So, just finish
 138                          * mounting, and get on with the boring life
 139                          * without disk quotas.
 140                          */
 141                         xfs_qm_mount_quotas(mp);
 142                 } else {
 143                         /*
 144                          * Clear the quota flags, but remember them. This
 145                          * is so that the quota code doesn't get invoked
 146                          * before we're ready. This can happen when an
 147                          * inode goes inactive and wants to free blocks,
 148                          * or via xfs_log_mount_finish.
 149                          */
 150                         *needquotamount = true;
 151                         *quotaflags = mp->m_qflags;
 152                         mp->m_qflags = 0;
 153                 }
 154         }
 155
 156         return 0;
 157 }