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_dir2.h"
  27 #include "xfs_alloc.h"
  28 #include "xfs_dmapi.h"
  29 #include "xfs_quota.h"
  30 #include "xfs_mount.h"
  31 #include "xfs_bmap_btree.h"
  32 #include "xfs_alloc_btree.h"
  33 #include "xfs_ialloc_btree.h"
  34 #include "xfs_dir2_sf.h"
  35 #include "xfs_attr_sf.h"
  36 #include "xfs_dinode.h"
  37 #include "xfs_inode.h"
  38 #include "xfs_ialloc.h"
  39 #include "xfs_itable.h"
  40 #include "xfs_btree.h"
  41 #include "xfs_bmap.h"
  42 #include "xfs_rtalloc.h"
  43 #include "xfs_error.h"
  44 #include "xfs_rw.h"
  45 #include "xfs_attr.h"
  46 #include "xfs_buf_item.h"
  47 #include "xfs_qm.h"
  48
  49
  50 STATIC void
  51 xfs_fill_statvfs_from_dquot(
  52         struct kstatfs          *statp,
  53         xfs_disk_dquot_t        *dp)
  54 {
  55         __uint64_t              limit;
  56
  57         limit = dp->d_blk_softlimit ?
  58                 be64_to_cpu(dp->d_blk_softlimit) :
  59                 be64_to_cpu(dp->d_blk_hardlimit);
  60         if (limit && statp->f_blocks > limit) {
  61                 statp->f_blocks = limit;
  62                 statp->f_bfree =
  63                         (statp->f_blocks > be64_to_cpu(dp->d_bcount)) ?
  64                          (statp->f_blocks - be64_to_cpu(dp->d_bcount)) : 0;
  65         }
  66
  67         limit = dp->d_ino_softlimit ?
  68                 be64_to_cpu(dp->d_ino_softlimit) :
  69                 be64_to_cpu(dp->d_ino_hardlimit);
  70         if (limit && statp->f_files > limit) {
  71                 statp->f_files = limit;
  72                 statp->f_ffree =
  73                         (statp->f_files > be64_to_cpu(dp->d_icount)) ?
  74                          (statp->f_ffree - be64_to_cpu(dp->d_icount)) : 0;
  75         }
  76 }
  77
  78
  79 /*
  80  * Directory tree accounting is implemented using project quotas, where
  81  * the project identifier is inherited from parent directories.
  82  * A statvfs (df, etc.) of a directory that is using project quota should
  83  * return a statvfs of the project, not the entire filesystem.
  84  * This makes such trees appear as if they are filesystems in themselves.
  85  */
  86 void
  87 xfs_qm_statvfs(
  88         xfs_inode_t             *ip,
  89         struct kstatfs          *statp)
  90 {
  91         xfs_mount_t             *mp = ip->i_mount;
  92         xfs_dquot_t             *dqp;
  93
  94         if (!xfs_qm_dqget(mp, NULL, ip->i_d.di_projid, XFS_DQ_PROJ, 0, &dqp)) {
  95                 xfs_fill_statvfs_from_dquot(statp, &dqp->q_core);
  96                 xfs_qm_dqput(dqp);
  97         }
  98 }
  99
 100 int
 101 xfs_qm_newmount(
 102         xfs_mount_t     *mp,
 103         uint            *needquotamount,
 104         uint            *quotaflags)
 105 {
 106         uint            quotaondisk;
 107         uint            uquotaondisk = 0, gquotaondisk = 0, pquotaondisk = 0;
 108
 109         quotaondisk = xfs_sb_version_hasquota(&mp->m_sb) &&
 110                                 (mp->m_sb.sb_qflags & XFS_ALL_QUOTA_ACCT);
 111
 112         if (quotaondisk) {
 113                 uquotaondisk = mp->m_sb.sb_qflags & XFS_UQUOTA_ACCT;
 114                 pquotaondisk = mp->m_sb.sb_qflags & XFS_PQUOTA_ACCT;
 115                 gquotaondisk = mp->m_sb.sb_qflags & XFS_GQUOTA_ACCT;
 116         }
 117
 118         /*
 119          * If the device itself is read-only, we can't allow
 120          * the user to change the state of quota on the mount -
 121          * this would generate a transaction on the ro device,
 122          * which would lead to an I/O error and shutdown
 123          */
 124
 125         if (((uquotaondisk && !XFS_IS_UQUOTA_ON(mp)) ||
 126             (!uquotaondisk &&  XFS_IS_UQUOTA_ON(mp)) ||
 127              (pquotaondisk && !XFS_IS_PQUOTA_ON(mp)) ||
 128             (!pquotaondisk &&  XFS_IS_PQUOTA_ON(mp)) ||
 129              (gquotaondisk && !XFS_IS_GQUOTA_ON(mp)) ||
 130             (!gquotaondisk &&  XFS_IS_OQUOTA_ON(mp)))  &&
 131             xfs_dev_is_read_only(mp, "changing quota state")) {
 132                 cmn_err(CE_WARN,
 133                         "XFS: please mount with%s%s%s%s.",
 134                         (!quotaondisk ? "out quota" : ""),
 135                         (uquotaondisk ? " usrquota" : ""),
 136                         (pquotaondisk ? " prjquota" : ""),
 137                         (gquotaondisk ? " grpquota" : ""));
 138                 return XFS_ERROR(EPERM);
 139         }
 140
 141         if (XFS_IS_QUOTA_ON(mp) || quotaondisk) {
 142                 /*
 143                  * Call mount_quotas at this point only if we won't have to do
 144                  * a quotacheck.
 145                  */
 146                 if (quotaondisk && !XFS_QM_NEED_QUOTACHECK(mp)) {
 147                         /*
 148                          * If an error occured, qm_mount_quotas code
 149                          * has already disabled quotas. So, just finish
 150                          * mounting, and get on with the boring life
 151                          * without disk quotas.
 152                          */
 153                         xfs_qm_mount_quotas(mp);
 154                 } else {
 155                         /*
 156                          * Clear the quota flags, but remember them. This
 157                          * is so that the quota code doesn't get invoked
 158                          * before we're ready. This can happen when an
 159                          * inode goes inactive and wants to free blocks,
 160                          * or via xfs_log_mount_finish.
 161                          */
 162                         *needquotamount = B_TRUE;
 163                         *quotaflags = mp->m_qflags;
 164                         mp->m_qflags = 0;
 165                 }
 166         }
 167
 168         return 0;
 169 }
 170
 171 void __init
 172 xfs_qm_init(void)
 173 {
 174         printk(KERN_INFO "SGI XFS Quota Management subsystem\n");
 175         mutex_init(&xfs_Gqm_lock);
 176         xfs_qm_init_procfs();
 177 }
 178
 179 void __exit
 180 xfs_qm_exit(void)
 181 {
 182         xfs_qm_cleanup_procfs();
 183         if (qm_dqzone)
 184                 kmem_zone_destroy(qm_dqzone);
 185         if (qm_dqtrxzone)
 186                 kmem_zone_destroy(qm_dqtrxzone);
 187 }