release/src-rt-6.x/linux/linux-2.6/fs/xfs/xfs_qmops.c

   1 /*
   2  * Copyright (c) 2000-2005 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_types.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_dmapi.h"
  28 #include "xfs_mount.h"
  29 #include "xfs_quota.h"
  30 #include "xfs_error.h"
  31
  32 STATIC struct xfs_dquot *
  33 xfs_dqvopchown_default(
  34         struct xfs_trans        *tp,
  35         struct xfs_inode        *ip,
  36         struct xfs_dquot        **dqp,
  37         struct xfs_dquot        *dq)
  38 {
  39         return NULL;
  40 }
  41
  42 /*
  43  * Clear the quotaflags in memory and in the superblock.
  44  */
  45 int
  46 xfs_mount_reset_sbqflags(xfs_mount_t *mp)
  47 {
  48         int                     error;
  49         xfs_trans_t             *tp;
  50         unsigned long           s;
  51
  52         mp->m_qflags = 0;
  53         /*
  54          * It is OK to look at sb_qflags here in mount path,
  55          * without SB_LOCK.
  56          */
  57         if (mp->m_sb.sb_qflags == 0)
  58                 return 0;
  59         s = XFS_SB_LOCK(mp);
  60         mp->m_sb.sb_qflags = 0;
  61         XFS_SB_UNLOCK(mp, s);
  62
  63         /*
  64          * if the fs is readonly, let the incore superblock run
  65          * with quotas off but don't flush the update out to disk
  66          */
  67         if (XFS_MTOVFS(mp)->vfs_flag & VFS_RDONLY)
  68                 return 0;
  69 #ifdef QUOTADEBUG
  70         xfs_fs_cmn_err(CE_NOTE, mp, "Writing superblock quota changes");
  71 #endif
  72         tp = xfs_trans_alloc(mp, XFS_TRANS_QM_SBCHANGE);
  73         if ((error = xfs_trans_reserve(tp, 0, mp->m_sb.sb_sectsize + 128, 0, 0,
  74                                       XFS_DEFAULT_LOG_COUNT))) {
  75                 xfs_trans_cancel(tp, 0);
  76                 xfs_fs_cmn_err(CE_ALERT, mp,
  77                         "xfs_mount_reset_sbqflags: Superblock update failed!");
  78                 return error;
  79         }
  80         xfs_mod_sb(tp, XFS_SB_QFLAGS);
  81         error = xfs_trans_commit(tp, 0);
  82         return error;
  83 }
  84
  85 STATIC int
  86 xfs_noquota_init(
  87         xfs_mount_t     *mp,
  88         uint            *needquotamount,
  89         uint            *quotaflags)
  90 {
  91         int             error = 0;
  92
  93         *quotaflags = 0;
  94         *needquotamount = B_FALSE;
  95
  96         ASSERT(!XFS_IS_QUOTA_ON(mp));
  97
  98         /*
  99          * If a file system had quotas running earlier, but decided to
 100          * mount without -o uquota/pquota/gquota options, revoke the
 101          * quotachecked license.
 102          */
 103         if (mp->m_sb.sb_qflags & XFS_ALL_QUOTA_ACCT) {
 104                 cmn_err(CE_NOTE,
 105                         "XFS resetting qflags for filesystem %s",
 106                         mp->m_fsname);
 107
 108                 error = xfs_mount_reset_sbqflags(mp);
 109         }
 110         return error;
 111 }
 112
 113 xfs_qmops_t     xfs_qmcore_stub = {
 114         .xfs_qminit             = (xfs_qminit_t) xfs_noquota_init,
 115         .xfs_qmdone             = (xfs_qmdone_t) fs_noerr,
 116         .xfs_qmmount            = (xfs_qmmount_t) fs_noerr,
 117         .xfs_qmunmount          = (xfs_qmunmount_t) fs_noerr,
 118         .xfs_dqrele             = (xfs_dqrele_t) fs_noerr,
 119         .xfs_dqattach           = (xfs_dqattach_t) fs_noerr,
 120         .xfs_dqdetach           = (xfs_dqdetach_t) fs_noerr,
 121         .xfs_dqpurgeall         = (xfs_dqpurgeall_t) fs_noerr,
 122         .xfs_dqvopalloc         = (xfs_dqvopalloc_t) fs_noerr,
 123         .xfs_dqvopcreate        = (xfs_dqvopcreate_t) fs_noerr,
 124         .xfs_dqvoprename        = (xfs_dqvoprename_t) fs_noerr,
 125         .xfs_dqvopchown         = xfs_dqvopchown_default,
 126         .xfs_dqvopchownresv     = (xfs_dqvopchownresv_t) fs_noerr,
 127 };