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 #include "xfs_clnt.h"
  32
  33
  34 STATIC struct xfs_dquot *
  35 xfs_dqvopchown_default(
  36         struct xfs_trans        *tp,
  37         struct xfs_inode        *ip,
  38         struct xfs_dquot        **dqp,
  39         struct xfs_dquot        *dq)
  40 {
  41         return NULL;
  42 }
  43
  44 /*
  45  * Clear the quotaflags in memory and in the superblock.
  46  */
  47 int
  48 xfs_mount_reset_sbqflags(xfs_mount_t *mp)
  49 {
  50         int                     error;
  51         xfs_trans_t             *tp;
  52         unsigned long           s;
  53
  54         mp->m_qflags = 0;
  55         /*
  56          * It is OK to look at sb_qflags here in mount path,
  57          * without SB_LOCK.
  58          */
  59         if (mp->m_sb.sb_qflags == 0)
  60                 return 0;
  61         s = XFS_SB_LOCK(mp);
  62         mp->m_sb.sb_qflags = 0;
  63         XFS_SB_UNLOCK(mp, s);
  64
  65         /*
  66          * if the fs is readonly, let the incore superblock run
  67          * with quotas off but don't flush the update out to disk
  68          */
  69         if (XFS_MTOVFS(mp)->vfs_flag & VFS_RDONLY)
  70                 return 0;
  71 #ifdef QUOTADEBUG
  72         xfs_fs_cmn_err(CE_NOTE, mp, "Writing superblock quota changes");
  73 #endif
  74         tp = xfs_trans_alloc(mp, XFS_TRANS_QM_SBCHANGE);
  75         if ((error = xfs_trans_reserve(tp, 0, mp->m_sb.sb_sectsize + 128, 0, 0,
  76                                       XFS_DEFAULT_LOG_COUNT))) {
  77                 xfs_trans_cancel(tp, 0);
  78                 xfs_fs_cmn_err(CE_ALERT, mp,
  79                         "xfs_mount_reset_sbqflags: Superblock update failed!");
  80                 return error;
  81         }
  82         xfs_mod_sb(tp, XFS_SB_QFLAGS);
  83         error = xfs_trans_commit(tp, 0);
  84         return error;
  85 }
  86
  87 STATIC int
  88 xfs_noquota_init(
  89         xfs_mount_t     *mp,
  90         uint            *needquotamount,
  91         uint            *quotaflags)
  92 {
  93         int             error = 0;
  94
  95         *quotaflags = 0;
  96         *needquotamount = B_FALSE;
  97
  98         ASSERT(!XFS_IS_QUOTA_ON(mp));
  99
 100         /*
 101          * If a file system had quotas running earlier, but decided to
 102          * mount without -o uquota/pquota/gquota options, revoke the
 103          * quotachecked license.
 104          */
 105         if (mp->m_sb.sb_qflags & XFS_ALL_QUOTA_ACCT) {
 106                 cmn_err(CE_NOTE,
 107                         "XFS resetting qflags for filesystem %s",
 108                         mp->m_fsname);
 109
 110                 error = xfs_mount_reset_sbqflags(mp);
 111         }
 112         return error;
 113 }
 114
 115 static struct xfs_qmops xfs_qmcore_stub = {
 116         .xfs_qminit             = (xfs_qminit_t) xfs_noquota_init,
 117         .xfs_qmdone             = (xfs_qmdone_t) fs_noerr,
 118         .xfs_qmmount            = (xfs_qmmount_t) fs_noerr,
 119         .xfs_qmunmount          = (xfs_qmunmount_t) fs_noerr,
 120         .xfs_dqrele             = (xfs_dqrele_t) fs_noerr,
 121         .xfs_dqattach           = (xfs_dqattach_t) fs_noerr,
 122         .xfs_dqdetach           = (xfs_dqdetach_t) fs_noerr,
 123         .xfs_dqpurgeall         = (xfs_dqpurgeall_t) fs_noerr,
 124         .xfs_dqvopalloc         = (xfs_dqvopalloc_t) fs_noerr,
 125         .xfs_dqvopcreate        = (xfs_dqvopcreate_t) fs_noerr,
 126         .xfs_dqvoprename        = (xfs_dqvoprename_t) fs_noerr,
 127         .xfs_dqvopchown         = xfs_dqvopchown_default,
 128         .xfs_dqvopchownresv     = (xfs_dqvopchownresv_t) fs_noerr,
 129         .xfs_dqstatvfs          = (xfs_dqstatvfs_t) fs_noval,
 130         .xfs_dqsync             = (xfs_dqsync_t) fs_noerr,
 131         .xfs_quotactl           = (xfs_quotactl_t) fs_nosys,
 132 };
 133
 134 int
 135 xfs_qmops_get(struct xfs_mount *mp, struct xfs_mount_args *args)
 136 {
 137         if (args->flags & (XFSMNT_UQUOTA | XFSMNT_PQUOTA | XFSMNT_GQUOTA)) {
 138                 struct xfs_qmops *ops;
 139
 140                 ops = symbol_get(xfs_qmcore_xfs);
 141                 if (!ops) {
 142                         request_module("xfs_quota");
 143                         ops = symbol_get(xfs_qmcore_xfs);
 144                 }
 145
 146                 if (!ops) {
 147                         cmn_err(CE_WARN, "XFS: no quota support available.");
 148                         return EINVAL;
 149                 }
 150                 mp->m_qm_ops = ops;
 151         } else {
 152                 mp->m_qm_ops = &xfs_qmcore_stub;
 153         }
 154
 155         return 0;
 156 }
 157
 158 void
 159 xfs_qmops_put(struct xfs_mount *mp)
 160 {
 161         if (mp->m_qm_ops != &xfs_qmcore_stub)
 162                 symbol_put(xfs_qmcore_xfs);
 163 }