fs/xfs/quota/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_bit.h"
  21 #include "xfs_log.h"
  22 #include "xfs_inum.h"
  23 #include "xfs_trans.h"
  24 #include "xfs_sb.h"
  25 #include "xfs_ag.h"
  26 #include "xfs_alloc.h"
  27 #include "xfs_quota.h"
  28 #include "xfs_mount.h"
  29 #include "xfs_bmap_btree.h"
  30 #include "xfs_inode.h"
  31 #include "xfs_itable.h"
  32 #include "xfs_bmap.h"
  33 #include "xfs_rtalloc.h"
  34 #include "xfs_error.h"
  35 #include "xfs_attr.h"
  36 #include "xfs_buf_item.h"
  37 #include "xfs_qm.h"
  38
  39
  40 STATIC void
  41 xfs_fill_statvfs_from_dquot(
  42         struct kstatfs          *statp,
  43         xfs_disk_dquot_t        *dp)
  44 {
  45         __uint64_t              limit;
  46
  47         limit = dp->d_blk_softlimit ?
  48                 be64_to_cpu(dp->d_blk_softlimit) :
  49                 be64_to_cpu(dp->d_blk_hardlimit);
  50         if (limit && statp->f_blocks > limit) {
  51                 statp->f_blocks = limit;
  52                 statp->f_bfree = statp->f_bavail =
  53                         (statp->f_blocks > be64_to_cpu(dp->d_bcount)) ?
  54                          (statp->f_blocks - be64_to_cpu(dp->d_bcount)) : 0;
  55         }
  56
  57         limit = dp->d_ino_softlimit ?
  58                 be64_to_cpu(dp->d_ino_softlimit) :
  59                 be64_to_cpu(dp->d_ino_hardlimit);
  60         if (limit && statp->f_files > limit) {
  61                 statp->f_files = limit;
  62                 statp->f_ffree =
  63                         (statp->f_files > be64_to_cpu(dp->d_icount)) ?
  64                          (statp->f_ffree - be64_to_cpu(dp->d_icount)) : 0;
  65         }
  66 }
  67
  68
  69 /*
  70  * Directory tree accounting is implemented using project quotas, where
  71  * the project identifier is inherited from parent directories.
  72  * A statvfs (df, etc.) of a directory that is using project quota should
  73  * return a statvfs of the project, not the entire filesystem.
  74  * This makes such trees appear as if they are filesystems in themselves.
  75  */
  76 void
  77 xfs_qm_statvfs(
  78         xfs_inode_t             *ip,
  79         struct kstatfs          *statp)
  80 {
  81         xfs_mount_t             *mp = ip->i_mount;
  82         xfs_dquot_t             *dqp;
  83
  84         if (!xfs_qm_dqget(mp, NULL, xfs_get_projid(ip), XFS_DQ_PROJ, 0, &dqp)) {
  85                 xfs_fill_statvfs_from_dquot(statp, &dqp->q_core);
  86                 xfs_qm_dqput(dqp);
  87         }
  88 }
  89
  90 int
  91 xfs_qm_newmount(
  92         xfs_mount_t     *mp,
  93         uint            *needquotamount,
  94         uint            *quotaflags)
  95 {
  96         uint            quotaondisk;
  97         uint            uquotaondisk = 0, gquotaondisk = 0, pquotaondisk = 0;
  98
  99         quotaondisk = xfs_sb_version_hasquota(&mp->m_sb) &&
 100                                 (mp->m_sb.sb_qflags & XFS_ALL_QUOTA_ACCT);
 101
 102         if (quotaondisk) {
 103                 uquotaondisk = mp->m_sb.sb_qflags & XFS_UQUOTA_ACCT;
 104                 pquotaondisk = mp->m_sb.sb_qflags & XFS_PQUOTA_ACCT;
 105                 gquotaondisk = mp->m_sb.sb_qflags & XFS_GQUOTA_ACCT;
 106         }
 107
 108         /*
 109          * If the device itself is read-only, we can't allow
 110          * the user to change the state of quota on the mount -
 111          * this would generate a transaction on the ro device,
 112          * which would lead to an I/O error and shutdown
 113          */
 114
 115         if (((uquotaondisk && !XFS_IS_UQUOTA_ON(mp)) ||
 116             (!uquotaondisk &&  XFS_IS_UQUOTA_ON(mp)) ||
 117              (pquotaondisk && !XFS_IS_PQUOTA_ON(mp)) ||
 118             (!pquotaondisk &&  XFS_IS_PQUOTA_ON(mp)) ||
 119              (gquotaondisk && !XFS_IS_GQUOTA_ON(mp)) ||
 120             (!gquotaondisk &&  XFS_IS_OQUOTA_ON(mp)))  &&
 121             xfs_dev_is_read_only(mp, "changing quota state")) {
 122                 xfs_warn(mp, "please mount with%s%s%s%s.",
 123                         (!quotaondisk ? "out quota" : ""),
 124                         (uquotaondisk ? " usrquota" : ""),
 125                         (pquotaondisk ? " prjquota" : ""),
 126                         (gquotaondisk ? " grpquota" : ""));
 127                 return XFS_ERROR(EPERM);
 128         }
 129
 130         if (XFS_IS_QUOTA_ON(mp) || quotaondisk) {
 131                 /*
 132                  * Call mount_quotas at this point only if we won't have to do
 133                  * a quotacheck.
 134                  */
 135                 if (quotaondisk && !XFS_QM_NEED_QUOTACHECK(mp)) {
 136                         /*
 137                          * If an error occured, qm_mount_quotas code
 138                          * has already disabled quotas. So, just finish
 139                          * mounting, and get on with the boring life
 140                          * without disk quotas.
 141                          */
 142                         xfs_qm_mount_quotas(mp);
 143                 } else {
 144                         /*
 145                          * Clear the quota flags, but remember them. This
 146                          * is so that the quota code doesn't get invoked
 147                          * before we're ready. This can happen when an
 148                          * inode goes inactive and wants to free blocks,
 149                          * or via xfs_log_mount_finish.
 150                          */
 151                         *needquotamount = B_TRUE;
 152                         *quotaflags = mp->m_qflags;
 153                         mp->m_qflags = 0;
 154                 }
 155         }
 156
 157         return 0;
 158 }
 159
 160 void __init
 161 xfs_qm_init(void)
 162 {
 163         printk(KERN_INFO "SGI XFS Quota Management subsystem\n");
 164         mutex_init(&xfs_Gqm_lock);
 165         xfs_qm_init_procfs();
 166 }
 167
 168 void __exit
 169 xfs_qm_exit(void)
 170 {
 171         xfs_qm_cleanup_procfs();
 172         if (qm_dqzone)
 173                 kmem_zone_destroy(qm_dqzone);
 174         if (qm_dqtrxzone)
 175                 kmem_zone_destroy(qm_dqtrxzone);
 176 }