1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
|
// SPDX-License-Identifier: GPL-2.0
/*
* linux/fs/hfsplus/options.c
*
* Copyright (C) 2001
* Brad Boyer (flar@allandria.com)
* (C) 2003 Ardis Technologies <roman@ardistech.com>
*
* Option parsing
*/
#include <linux/string.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/fs_context.h>
#include <linux/fs_parser.h>
#include <linux/nls.h>
#include <linux/mount.h>
#include <linux/seq_file.h>
#include <linux/slab.h>
#include "hfsplus_fs.h"
enum {
opt_creator, opt_type,
opt_umask, opt_uid, opt_gid,
opt_part, opt_session, opt_nls,
opt_decompose, opt_barrier,
opt_force,
};
static const struct fs_parameter_spec hfs_param_spec[] = {
fsparam_string ("creator", opt_creator),
fsparam_string ("type", opt_type),
fsparam_u32oct ("umask", opt_umask),
fsparam_u32 ("uid", opt_uid),
fsparam_u32 ("gid", opt_gid),
fsparam_u32 ("part", opt_part),
fsparam_u32 ("session", opt_session),
fsparam_string ("nls", opt_nls),
fsparam_flag_no ("decompose", opt_decompose),
fsparam_flag_no ("barrier", opt_barrier),
fsparam_flag ("force", opt_force),
{}
};
/* Initialize an options object to reasonable defaults */
void hfsplus_fill_defaults(struct hfsplus_sb_info *opts)
{
if (!opts)
return;
opts->creator = HFSPLUS_DEF_CR_TYPE;
opts->type = HFSPLUS_DEF_CR_TYPE;
opts->umask = current_umask();
opts->uid = current_uid();
opts->gid = current_gid();
opts->part = -1;
opts->session = -1;
}
/* Parse options from mount. Returns nonzero errno on failure */
int hfsplus_parse_param(struct fs_context *fc, struct fs_parameter *param)
{
struct hfsplus_sb_info *sbi = fc->s_fs_info;
struct fs_parse_result result;
int opt;
/*
* Only the force option is examined during remount, all others
* are ignored.
*/
if (fc->purpose == FS_CONTEXT_FOR_RECONFIGURE &&
strncmp(param->key, "force", 5))
return 0;
opt = fs_parse(fc, hfs_param_spec, param, &result);
if (opt < 0)
return opt;
switch (opt) {
case opt_creator:
if (strlen(param->string) != 4) {
pr_err("creator requires a 4 character value\n");
return -EINVAL;
}
memcpy(&sbi->creator, param->string, 4);
break;
case opt_type:
if (strlen(param->string) != 4) {
pr_err("type requires a 4 character value\n");
return -EINVAL;
}
memcpy(&sbi->type, param->string, 4);
break;
case opt_umask:
sbi->umask = (umode_t)result.uint_32;
break;
case opt_uid:
sbi->uid = result.uid;
set_bit(HFSPLUS_SB_UID, &sbi->flags);
break;
case opt_gid:
sbi->gid = result.gid;
set_bit(HFSPLUS_SB_GID, &sbi->flags);
break;
case opt_part:
sbi->part = result.uint_32;
break;
case opt_session:
sbi->session = result.uint_32;
break;
case opt_nls:
if (sbi->nls) {
pr_err("unable to change nls mapping\n");
return -EINVAL;
}
sbi->nls = load_nls(param->string);
if (!sbi->nls) {
pr_err("unable to load nls mapping \"%s\"\n",
param->string);
return -EINVAL;
}
break;
case opt_decompose:
if (result.negated)
set_bit(HFSPLUS_SB_NODECOMPOSE, &sbi->flags);
else
clear_bit(HFSPLUS_SB_NODECOMPOSE, &sbi->flags);
break;
case opt_barrier:
if (result.negated)
set_bit(HFSPLUS_SB_NOBARRIER, &sbi->flags);
else
clear_bit(HFSPLUS_SB_NOBARRIER, &sbi->flags);
break;
case opt_force:
set_bit(HFSPLUS_SB_FORCE, &sbi->flags);
break;
default:
return -EINVAL;
}
return 0;
}
int hfsplus_show_options(struct seq_file *seq, struct dentry *root)
{
struct hfsplus_sb_info *sbi = HFSPLUS_SB(root->d_sb);
if (sbi->creator != HFSPLUS_DEF_CR_TYPE)
seq_show_option_n(seq, "creator", (char *)&sbi->creator, 4);
if (sbi->type != HFSPLUS_DEF_CR_TYPE)
seq_show_option_n(seq, "type", (char *)&sbi->type, 4);
seq_printf(seq, ",umask=%o,uid=%u,gid=%u", sbi->umask,
from_kuid_munged(&init_user_ns, sbi->uid),
from_kgid_munged(&init_user_ns, sbi->gid));
if (sbi->part >= 0)
seq_printf(seq, ",part=%u", sbi->part);
if (sbi->session >= 0)
seq_printf(seq, ",session=%u", sbi->session);
if (sbi->nls)
seq_printf(seq, ",nls=%s", sbi->nls->charset);
if (test_bit(HFSPLUS_SB_NODECOMPOSE, &sbi->flags))
seq_puts(seq, ",nodecompose");
if (test_bit(HFSPLUS_SB_NOBARRIER, &sbi->flags))
seq_puts(seq, ",nobarrier");
return 0;
}
|
