block: make gendisk hold a reference to its queue
[linux-2.6.git] / fs / xfs / xfs_quotaops.c
1 /*
2  * Copyright (c) 2008, Christoph Hellwig
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_sb.h"
20 #include "xfs_inum.h"
21 #include "xfs_log.h"
22 #include "xfs_ag.h"
23 #include "xfs_mount.h"
24 #include "xfs_quota.h"
25 #include "xfs_trans.h"
26 #include "xfs_bmap_btree.h"
27 #include "xfs_inode.h"
28 #include "xfs_qm.h"
29 #include <linux/quota.h>
30
31
32 STATIC int
33 xfs_quota_type(int type)
34 {
35         switch (type) {
36         case USRQUOTA:
37                 return XFS_DQ_USER;
38         case GRPQUOTA:
39                 return XFS_DQ_GROUP;
40         default:
41                 return XFS_DQ_PROJ;
42         }
43 }
44
45 STATIC int
46 xfs_fs_get_xstate(
47         struct super_block      *sb,
48         struct fs_quota_stat    *fqs)
49 {
50         struct xfs_mount        *mp = XFS_M(sb);
51
52         if (!XFS_IS_QUOTA_RUNNING(mp))
53                 return -ENOSYS;
54         return -xfs_qm_scall_getqstat(mp, fqs);
55 }
56
57 STATIC int
58 xfs_fs_set_xstate(
59         struct super_block      *sb,
60         unsigned int            uflags,
61         int                     op)
62 {
63         struct xfs_mount        *mp = XFS_M(sb);
64         unsigned int            flags = 0;
65
66         if (sb->s_flags & MS_RDONLY)
67                 return -EROFS;
68         if (op != Q_XQUOTARM && !XFS_IS_QUOTA_RUNNING(mp))
69                 return -ENOSYS;
70
71         if (uflags & FS_QUOTA_UDQ_ACCT)
72                 flags |= XFS_UQUOTA_ACCT;
73         if (uflags & FS_QUOTA_PDQ_ACCT)
74                 flags |= XFS_PQUOTA_ACCT;
75         if (uflags & FS_QUOTA_GDQ_ACCT)
76                 flags |= XFS_GQUOTA_ACCT;
77         if (uflags & FS_QUOTA_UDQ_ENFD)
78                 flags |= XFS_UQUOTA_ENFD;
79         if (uflags & (FS_QUOTA_PDQ_ENFD|FS_QUOTA_GDQ_ENFD))
80                 flags |= XFS_OQUOTA_ENFD;
81
82         switch (op) {
83         case Q_XQUOTAON:
84                 return -xfs_qm_scall_quotaon(mp, flags);
85         case Q_XQUOTAOFF:
86                 if (!XFS_IS_QUOTA_ON(mp))
87                         return -EINVAL;
88                 return -xfs_qm_scall_quotaoff(mp, flags);
89         case Q_XQUOTARM:
90                 if (XFS_IS_QUOTA_ON(mp))
91                         return -EINVAL;
92                 return -xfs_qm_scall_trunc_qfiles(mp, flags);
93         }
94
95         return -EINVAL;
96 }
97
98 STATIC int
99 xfs_fs_get_dqblk(
100         struct super_block      *sb,
101         int                     type,
102         qid_t                   id,
103         struct fs_disk_quota    *fdq)
104 {
105         struct xfs_mount        *mp = XFS_M(sb);
106
107         if (!XFS_IS_QUOTA_RUNNING(mp))
108                 return -ENOSYS;
109         if (!XFS_IS_QUOTA_ON(mp))
110                 return -ESRCH;
111
112         return -xfs_qm_scall_getquota(mp, id, xfs_quota_type(type), fdq);
113 }
114
115 STATIC int
116 xfs_fs_set_dqblk(
117         struct super_block      *sb,
118         int                     type,
119         qid_t                   id,
120         struct fs_disk_quota    *fdq)
121 {
122         struct xfs_mount        *mp = XFS_M(sb);
123
124         if (sb->s_flags & MS_RDONLY)
125                 return -EROFS;
126         if (!XFS_IS_QUOTA_RUNNING(mp))
127                 return -ENOSYS;
128         if (!XFS_IS_QUOTA_ON(mp))
129                 return -ESRCH;
130
131         return -xfs_qm_scall_setqlim(mp, id, xfs_quota_type(type), fdq);
132 }
133
134 const struct quotactl_ops xfs_quotactl_operations = {
135         .get_xstate             = xfs_fs_get_xstate,
136         .set_xstate             = xfs_fs_set_xstate,
137         .get_dqblk              = xfs_fs_get_dqblk,
138         .set_dqblk              = xfs_fs_set_dqblk,
139 };