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