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
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
|
// 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/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_nodecompose, opt_decompose,
opt_barrier, opt_nobarrier,
opt_force, opt_err
};
static const match_table_t tokens = {
{ opt_creator, "creator=%s" },
{ opt_type, "type=%s" },
{ opt_umask, "umask=%o" },
{ opt_uid, "uid=%u" },
{ opt_gid, "gid=%u" },
{ opt_part, "part=%u" },
{ opt_session, "session=%u" },
{ opt_nls, "nls=%s" },
{ opt_decompose, "decompose" },
{ opt_nodecompose, "nodecompose" },
{ opt_barrier, "barrier" },
{ opt_nobarrier, "nobarrier" },
{ opt_force, "force" },
{ opt_err, NULL }
};
/* 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;
}
/* convert a "four byte character" to a 32 bit int with error checks */
static inline int match_fourchar(substring_t *arg, u32 *result)
{
if (arg->to - arg->from != 4)
return -EINVAL;
memcpy(result, arg->from, 4);
return 0;
}
int hfsplus_parse_options_remount(char *input, int *force)
{
char *p;
substring_t args[MAX_OPT_ARGS];
int token;
if (!input)
return 1;
while ((p = strsep(&input, ",")) != NULL) {
if (!*p)
continue;
token = match_token(p, tokens, args);
switch (token) {
case opt_force:
*force = 1;
break;
default:
break;
}
}
return 1;
}
/* Parse options from mount. Returns 0 on failure */
/* input is the options passed to mount() as a string */
int hfsplus_parse_options(char *input, struct hfsplus_sb_info *sbi)
{
char *p;
substring_t args[MAX_OPT_ARGS];
int tmp, token;
if (!input)
goto done;
while ((p = strsep(&input, ",")) != NULL) {
if (!*p)
continue;
token = match_token(p, tokens, args);
switch (token) {
case opt_creator:
if (match_fourchar(&args[0], &sbi->creator)) {
pr_err("creator requires a 4 character value\n");
return 0;
}
break;
case opt_type:
if (match_fourchar(&args[0], &sbi->type)) {
pr_err("type requires a 4 character value\n");
return 0;
}
break;
case opt_umask:
if (match_octal(&args[0], &tmp)) {
pr_err("umask requires a value\n");
return 0;
}
sbi->umask = (umode_t)tmp;
break;
case opt_uid:
if (match_int(&args[0], &tmp)) {
pr_err("uid requires an argument\n");
return 0;
}
sbi->uid = make_kuid(current_user_ns(), (uid_t)tmp);
if (!uid_valid(sbi->uid)) {
pr_err("invalid uid specified\n");
return 0;
}
break;
case opt_gid:
if (match_int(&args[0], &tmp)) {
pr_err("gid requires an argument\n");
return 0;
}
sbi->gid = make_kgid(current_user_ns(), (gid_t)tmp);
if (!gid_valid(sbi->gid)) {
pr_err("invalid gid specified\n");
return 0;
}
break;
case opt_part:
if (match_int(&args[0], &sbi->part)) {
pr_err("part requires an argument\n");
return 0;
}
break;
case opt_session:
if (match_int(&args[0], &sbi->session)) {
pr_err("session requires an argument\n");
return 0;
}
break;
case opt_nls:
if (sbi->nls) {
pr_err("unable to change nls mapping\n");
return 0;
}
p = match_strdup(&args[0]);
if (p)
sbi->nls = load_nls(p);
if (!sbi->nls) {
pr_err("unable to load nls mapping \"%s\"\n",
p);
kfree(p);
return 0;
}
kfree(p);
break;
case opt_decompose:
clear_bit(HFSPLUS_SB_NODECOMPOSE, &sbi->flags);
break;
case opt_nodecompose:
set_bit(HFSPLUS_SB_NODECOMPOSE, &sbi->flags);
break;
case opt_barrier:
clear_bit(HFSPLUS_SB_NOBARRIER, &sbi->flags);
break;
case opt_nobarrier:
set_bit(HFSPLUS_SB_NOBARRIER, &sbi->flags);
break;
case opt_force:
set_bit(HFSPLUS_SB_FORCE, &sbi->flags);
break;
default:
return 0;
}
}
done:
if (!sbi->nls) {
/* try utf8 first, as this is the old default behaviour */
sbi->nls = load_nls("utf8");
if (!sbi->nls)
sbi->nls = load_nls_default();
if (!sbi->nls)
return 0;
}
return 1;
}
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;
}
|
