]>
Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * linux/fs/hfsplus/options.c | |
3 | * | |
4 | * Copyright (C) 2001 | |
5 | * Brad Boyer (flar@allandria.com) | |
6 | * (C) 2003 Ardis Technologies <roman@ardistech.com> | |
7 | * | |
8 | * Option parsing | |
9 | */ | |
10 | ||
11 | #include <linux/string.h> | |
12 | #include <linux/kernel.h> | |
13 | #include <linux/sched.h> | |
14 | #include <linux/parser.h> | |
15 | #include <linux/nls.h> | |
717dd80e RZ |
16 | #include <linux/mount.h> |
17 | #include <linux/seq_file.h> | |
5a0e3ad6 | 18 | #include <linux/slab.h> |
1da177e4 LT |
19 | #include "hfsplus_fs.h" |
20 | ||
21 | enum { | |
22 | opt_creator, opt_type, | |
23 | opt_umask, opt_uid, opt_gid, | |
24 | opt_part, opt_session, opt_nls, | |
25 | opt_nodecompose, opt_decompose, | |
34a2d313 | 26 | opt_barrier, opt_nobarrier, |
b0b623c3 | 27 | opt_force, opt_err |
1da177e4 LT |
28 | }; |
29 | ||
a447c093 | 30 | static const match_table_t tokens = { |
1da177e4 LT |
31 | { opt_creator, "creator=%s" }, |
32 | { opt_type, "type=%s" }, | |
33 | { opt_umask, "umask=%o" }, | |
34 | { opt_uid, "uid=%u" }, | |
35 | { opt_gid, "gid=%u" }, | |
36 | { opt_part, "part=%u" }, | |
37 | { opt_session, "session=%u" }, | |
38 | { opt_nls, "nls=%s" }, | |
39 | { opt_decompose, "decompose" }, | |
40 | { opt_nodecompose, "nodecompose" }, | |
34a2d313 CH |
41 | { opt_barrier, "barrier" }, |
42 | { opt_nobarrier, "nobarrier" }, | |
b0b623c3 | 43 | { opt_force, "force" }, |
1da177e4 LT |
44 | { opt_err, NULL } |
45 | }; | |
46 | ||
47 | /* Initialize an options object to reasonable defaults */ | |
717dd80e | 48 | void hfsplus_fill_defaults(struct hfsplus_sb_info *opts) |
1da177e4 LT |
49 | { |
50 | if (!opts) | |
51 | return; | |
52 | ||
53 | opts->creator = HFSPLUS_DEF_CR_TYPE; | |
54 | opts->type = HFSPLUS_DEF_CR_TYPE; | |
ce3b0f8d | 55 | opts->umask = current_umask(); |
4ac8489a DH |
56 | opts->uid = current_uid(); |
57 | opts->gid = current_gid(); | |
1da177e4 LT |
58 | opts->part = -1; |
59 | opts->session = -1; | |
60 | } | |
61 | ||
62 | /* convert a "four byte character" to a 32 bit int with error checks */ | |
63 | static inline int match_fourchar(substring_t *arg, u32 *result) | |
64 | { | |
65 | if (arg->to - arg->from != 4) | |
66 | return -EINVAL; | |
67 | memcpy(result, arg->from, 4); | |
68 | return 0; | |
69 | } | |
70 | ||
6f80dfe5 CH |
71 | int hfsplus_parse_options_remount(char *input, int *force) |
72 | { | |
73 | char *p; | |
74 | substring_t args[MAX_OPT_ARGS]; | |
75 | int token; | |
76 | ||
77 | if (!input) | |
bd2c0035 | 78 | return 1; |
6f80dfe5 CH |
79 | |
80 | while ((p = strsep(&input, ",")) != NULL) { | |
81 | if (!*p) | |
82 | continue; | |
83 | ||
84 | token = match_token(p, tokens, args); | |
85 | switch (token) { | |
86 | case opt_force: | |
87 | *force = 1; | |
88 | break; | |
89 | default: | |
90 | break; | |
91 | } | |
92 | } | |
93 | ||
94 | return 1; | |
95 | } | |
96 | ||
1da177e4 LT |
97 | /* Parse options from mount. Returns 0 on failure */ |
98 | /* input is the options passed to mount() as a string */ | |
717dd80e | 99 | int hfsplus_parse_options(char *input, struct hfsplus_sb_info *sbi) |
1da177e4 LT |
100 | { |
101 | char *p; | |
102 | substring_t args[MAX_OPT_ARGS]; | |
103 | int tmp, token; | |
104 | ||
105 | if (!input) | |
106 | goto done; | |
107 | ||
108 | while ((p = strsep(&input, ",")) != NULL) { | |
109 | if (!*p) | |
110 | continue; | |
111 | ||
112 | token = match_token(p, tokens, args); | |
113 | switch (token) { | |
114 | case opt_creator: | |
115 | if (match_fourchar(&args[0], &sbi->creator)) { | |
d6142673 | 116 | pr_err("creator requires a 4 character value\n"); |
1da177e4 LT |
117 | return 0; |
118 | } | |
119 | break; | |
120 | case opt_type: | |
121 | if (match_fourchar(&args[0], &sbi->type)) { | |
d6142673 | 122 | pr_err("type requires a 4 character value\n"); |
1da177e4 LT |
123 | return 0; |
124 | } | |
125 | break; | |
126 | case opt_umask: | |
127 | if (match_octal(&args[0], &tmp)) { | |
d6142673 | 128 | pr_err("umask requires a value\n"); |
1da177e4 LT |
129 | return 0; |
130 | } | |
131 | sbi->umask = (umode_t)tmp; | |
132 | break; | |
133 | case opt_uid: | |
134 | if (match_int(&args[0], &tmp)) { | |
d6142673 | 135 | pr_err("uid requires an argument\n"); |
1da177e4 LT |
136 | return 0; |
137 | } | |
16525e3f EB |
138 | sbi->uid = make_kuid(current_user_ns(), (uid_t)tmp); |
139 | if (!uid_valid(sbi->uid)) { | |
d6142673 | 140 | pr_err("invalid uid specified\n"); |
16525e3f EB |
141 | return 0; |
142 | } | |
1da177e4 LT |
143 | break; |
144 | case opt_gid: | |
145 | if (match_int(&args[0], &tmp)) { | |
d6142673 | 146 | pr_err("gid requires an argument\n"); |
1da177e4 LT |
147 | return 0; |
148 | } | |
16525e3f EB |
149 | sbi->gid = make_kgid(current_user_ns(), (gid_t)tmp); |
150 | if (!gid_valid(sbi->gid)) { | |
d6142673 | 151 | pr_err("invalid gid specified\n"); |
16525e3f EB |
152 | return 0; |
153 | } | |
1da177e4 LT |
154 | break; |
155 | case opt_part: | |
156 | if (match_int(&args[0], &sbi->part)) { | |
d6142673 | 157 | pr_err("part requires an argument\n"); |
1da177e4 LT |
158 | return 0; |
159 | } | |
160 | break; | |
161 | case opt_session: | |
162 | if (match_int(&args[0], &sbi->session)) { | |
d6142673 | 163 | pr_err("session requires an argument\n"); |
1da177e4 LT |
164 | return 0; |
165 | } | |
166 | break; | |
167 | case opt_nls: | |
168 | if (sbi->nls) { | |
d6142673 | 169 | pr_err("unable to change nls mapping\n"); |
1da177e4 LT |
170 | return 0; |
171 | } | |
172 | p = match_strdup(&args[0]); | |
cd6fda36 JM |
173 | if (p) |
174 | sbi->nls = load_nls(p); | |
1da177e4 | 175 | if (!sbi->nls) { |
d6142673 | 176 | pr_err("unable to load " |
2753cc28 AS |
177 | "nls mapping \"%s\"\n", |
178 | p); | |
1da177e4 LT |
179 | kfree(p); |
180 | return 0; | |
181 | } | |
182 | kfree(p); | |
183 | break; | |
184 | case opt_decompose: | |
84adede3 | 185 | clear_bit(HFSPLUS_SB_NODECOMPOSE, &sbi->flags); |
1da177e4 LT |
186 | break; |
187 | case opt_nodecompose: | |
84adede3 | 188 | set_bit(HFSPLUS_SB_NODECOMPOSE, &sbi->flags); |
1da177e4 | 189 | break; |
34a2d313 CH |
190 | case opt_barrier: |
191 | clear_bit(HFSPLUS_SB_NOBARRIER, &sbi->flags); | |
192 | break; | |
193 | case opt_nobarrier: | |
194 | set_bit(HFSPLUS_SB_NOBARRIER, &sbi->flags); | |
195 | break; | |
b0b623c3 | 196 | case opt_force: |
84adede3 | 197 | set_bit(HFSPLUS_SB_FORCE, &sbi->flags); |
b0b623c3 | 198 | break; |
1da177e4 LT |
199 | default: |
200 | return 0; | |
201 | } | |
202 | } | |
203 | ||
204 | done: | |
205 | if (!sbi->nls) { | |
206 | /* try utf8 first, as this is the old default behaviour */ | |
207 | sbi->nls = load_nls("utf8"); | |
208 | if (!sbi->nls) | |
209 | sbi->nls = load_nls_default(); | |
210 | if (!sbi->nls) | |
211 | return 0; | |
212 | } | |
213 | ||
214 | return 1; | |
215 | } | |
717dd80e | 216 | |
34c80b1d | 217 | int hfsplus_show_options(struct seq_file *seq, struct dentry *root) |
717dd80e | 218 | { |
34c80b1d | 219 | struct hfsplus_sb_info *sbi = HFSPLUS_SB(root->d_sb); |
717dd80e RZ |
220 | |
221 | if (sbi->creator != HFSPLUS_DEF_CR_TYPE) | |
222 | seq_printf(seq, ",creator=%.4s", (char *)&sbi->creator); | |
223 | if (sbi->type != HFSPLUS_DEF_CR_TYPE) | |
224 | seq_printf(seq, ",type=%.4s", (char *)&sbi->type); | |
2753cc28 | 225 | seq_printf(seq, ",umask=%o,uid=%u,gid=%u", sbi->umask, |
16525e3f EB |
226 | from_kuid_munged(&init_user_ns, sbi->uid), |
227 | from_kgid_munged(&init_user_ns, sbi->gid)); | |
717dd80e RZ |
228 | if (sbi->part >= 0) |
229 | seq_printf(seq, ",part=%u", sbi->part); | |
230 | if (sbi->session >= 0) | |
231 | seq_printf(seq, ",session=%u", sbi->session); | |
232 | if (sbi->nls) | |
233 | seq_printf(seq, ",nls=%s", sbi->nls->charset); | |
84adede3 | 234 | if (test_bit(HFSPLUS_SB_NODECOMPOSE, &sbi->flags)) |
717dd80e | 235 | seq_printf(seq, ",nodecompose"); |
34a2d313 CH |
236 | if (test_bit(HFSPLUS_SB_NOBARRIER, &sbi->flags)) |
237 | seq_printf(seq, ",nobarrier"); | |
717dd80e RZ |
238 | return 0; |
239 | } |