1 #include <linux/errno.h>
3 #include <linux/quota.h>
4 #include <linux/dqblk_v1.h>
5 #include <linux/quotaio_v1.h>
6 #include <linux/kernel.h>
7 #include <linux/init.h>
8 #include <linux/module.h>
10 #include <asm/uaccess.h>
11 #include <asm/byteorder.h>
13 MODULE_AUTHOR("Jan Kara");
14 MODULE_DESCRIPTION("Old quota format support");
15 MODULE_LICENSE("GPL");
17 static void v1_disk2mem_dqblk(struct mem_dqblk
*m
, struct v1_disk_dqblk
*d
)
19 m
->dqb_ihardlimit
= d
->dqb_ihardlimit
;
20 m
->dqb_isoftlimit
= d
->dqb_isoftlimit
;
21 m
->dqb_curinodes
= d
->dqb_curinodes
;
22 m
->dqb_bhardlimit
= d
->dqb_bhardlimit
;
23 m
->dqb_bsoftlimit
= d
->dqb_bsoftlimit
;
24 m
->dqb_curspace
= ((qsize_t
)d
->dqb_curblocks
) << QUOTABLOCK_BITS
;
25 m
->dqb_itime
= d
->dqb_itime
;
26 m
->dqb_btime
= d
->dqb_btime
;
29 static void v1_mem2disk_dqblk(struct v1_disk_dqblk
*d
, struct mem_dqblk
*m
)
31 d
->dqb_ihardlimit
= m
->dqb_ihardlimit
;
32 d
->dqb_isoftlimit
= m
->dqb_isoftlimit
;
33 d
->dqb_curinodes
= m
->dqb_curinodes
;
34 d
->dqb_bhardlimit
= m
->dqb_bhardlimit
;
35 d
->dqb_bsoftlimit
= m
->dqb_bsoftlimit
;
36 d
->dqb_curblocks
= toqb(m
->dqb_curspace
);
37 d
->dqb_itime
= m
->dqb_itime
;
38 d
->dqb_btime
= m
->dqb_btime
;
41 static int v1_read_dqblk(struct dquot
*dquot
)
43 int type
= dquot
->dq_type
;
47 struct v1_disk_dqblk dqblk
;
49 filp
= sb_dqopt(dquot
->dq_sb
)->files
[type
];
50 if (filp
== (struct file
*)NULL
)
53 /* Now we are sure filp is valid */
54 offset
= v1_dqoff(dquot
->dq_id
);
57 filp
->f_op
->read(filp
, (char *)&dqblk
, sizeof(struct v1_disk_dqblk
), &offset
);
60 v1_disk2mem_dqblk(&dquot
->dq_dqb
, &dqblk
);
61 if (dquot
->dq_dqb
.dqb_bhardlimit
== 0 && dquot
->dq_dqb
.dqb_bsoftlimit
== 0 &&
62 dquot
->dq_dqb
.dqb_ihardlimit
== 0 && dquot
->dq_dqb
.dqb_isoftlimit
== 0)
63 dquot
->dq_flags
|= DQ_FAKE
;
69 static int v1_commit_dqblk(struct dquot
*dquot
)
71 short type
= dquot
->dq_type
;
76 struct v1_disk_dqblk dqblk
;
78 filp
= sb_dqopt(dquot
->dq_sb
)->files
[type
];
79 offset
= v1_dqoff(dquot
->dq_id
);
84 * Note: clear the DQ_MOD flag unconditionally,
85 * so we don't loop forever on failure.
87 v1_mem2disk_dqblk(&dqblk
, &dquot
->dq_dqb
);
88 dquot
->dq_flags
&= ~DQ_MOD
;
89 if (dquot
->dq_id
== 0) {
90 dqblk
.dqb_btime
= sb_dqopt(dquot
->dq_sb
)->info
[type
].dqi_bgrace
;
91 dqblk
.dqb_itime
= sb_dqopt(dquot
->dq_sb
)->info
[type
].dqi_igrace
;
95 ret
= filp
->f_op
->write(filp
, (char *)&dqblk
,
96 sizeof(struct v1_disk_dqblk
), &offset
);
97 if (ret
!= sizeof(struct v1_disk_dqblk
)) {
98 printk(KERN_WARNING
"VFS: dquota write failed on dev %s\n",
113 /* Magics of new quota format */
114 #define V2_INITQMAGICS {\
115 0xd9c01f11, /* USRQUOTA */\
116 0xd9c01927 /* GRPQUOTA */\
119 /* Header of new quota format */
120 struct v2_disk_dqheader
{
121 __u32 dqh_magic
; /* Magic number identifying file */
122 __u32 dqh_version
; /* File version */
125 static int v1_check_quota_file(struct super_block
*sb
, int type
)
127 struct file
*f
= sb_dqopt(sb
)->files
[type
];
128 struct inode
*inode
= f
->f_dentry
->d_inode
;
131 struct v2_disk_dqheader dqhead
;
136 static const uint quota_magics
[] = V2_INITQMAGICS
;
138 isize
= i_size_read(inode
);
141 blocks
= isize
>> BLOCK_SIZE_BITS
;
142 off
= isize
& (BLOCK_SIZE
- 1);
143 if ((blocks
% sizeof(struct v1_disk_dqblk
) * BLOCK_SIZE
+ off
) % sizeof(struct v1_disk_dqblk
))
145 /* Doublecheck whether we didn't get file with new format - with old quotactl() this could happen */
148 size
= f
->f_op
->read(f
, (char *)&dqhead
, sizeof(struct v2_disk_dqheader
), &offset
);
150 if (size
!= sizeof(struct v2_disk_dqheader
))
151 return 1; /* Probably not new format */
152 if (le32_to_cpu(dqhead
.dqh_magic
) != quota_magics
[type
])
153 return 1; /* Definitely not new format */
154 printk(KERN_INFO
"VFS: %s: Refusing to turn on old quota format on given file. It probably contains newer quota format.\n", sb
->s_id
);
155 return 0; /* Seems like a new format file -> refuse it */
158 static int v1_read_file_info(struct super_block
*sb
, int type
)
160 struct quota_info
*dqopt
= sb_dqopt(sb
);
163 struct file
*filp
= dqopt
->files
[type
];
164 struct v1_disk_dqblk dqblk
;
167 offset
= v1_dqoff(0);
170 if ((ret
= filp
->f_op
->read(filp
, (char *)&dqblk
, sizeof(struct v1_disk_dqblk
), &offset
)) != sizeof(struct v1_disk_dqblk
)) {
176 dqopt
->info
[type
].dqi_igrace
= dqblk
.dqb_itime
? dqblk
.dqb_itime
: MAX_IQ_TIME
;
177 dqopt
->info
[type
].dqi_bgrace
= dqblk
.dqb_btime
? dqblk
.dqb_btime
: MAX_DQ_TIME
;
183 static int v1_write_file_info(struct super_block
*sb
, int type
)
185 struct quota_info
*dqopt
= sb_dqopt(sb
);
187 struct file
*filp
= dqopt
->files
[type
];
188 struct v1_disk_dqblk dqblk
;
192 dqopt
->info
[type
].dqi_flags
&= ~DQF_INFO_DIRTY
;
193 offset
= v1_dqoff(0);
196 if ((ret
= filp
->f_op
->read(filp
, (char *)&dqblk
, sizeof(struct v1_disk_dqblk
), &offset
)) != sizeof(struct v1_disk_dqblk
)) {
201 dqblk
.dqb_itime
= dqopt
->info
[type
].dqi_igrace
;
202 dqblk
.dqb_btime
= dqopt
->info
[type
].dqi_bgrace
;
203 offset
= v1_dqoff(0);
204 ret
= filp
->f_op
->write(filp
, (char *)&dqblk
, sizeof(struct v1_disk_dqblk
), &offset
);
205 if (ret
== sizeof(struct v1_disk_dqblk
))
214 static struct quota_format_ops v1_format_ops
= {
215 .check_quota_file
= v1_check_quota_file
,
216 .read_file_info
= v1_read_file_info
,
217 .write_file_info
= v1_write_file_info
,
218 .free_file_info
= NULL
,
219 .read_dqblk
= v1_read_dqblk
,
220 .commit_dqblk
= v1_commit_dqblk
,
223 static struct quota_format_type v1_quota_format
= {
224 .qf_fmt_id
= QFMT_VFS_OLD
,
225 .qf_ops
= &v1_format_ops
,
226 .qf_owner
= THIS_MODULE
229 static int __init
init_v1_quota_format(void)
231 return register_quota_format(&v1_quota_format
);
234 static void __exit
exit_v1_quota_format(void)
236 unregister_quota_format(&v1_quota_format
);
239 module_init(init_v1_quota_format
);
240 module_exit(exit_v1_quota_format
);