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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> | |
16 | #include "hfsplus_fs.h" | |
17 | ||
18 | enum { | |
19 | opt_creator, opt_type, | |
20 | opt_umask, opt_uid, opt_gid, | |
21 | opt_part, opt_session, opt_nls, | |
22 | opt_nodecompose, opt_decompose, | |
23 | opt_err | |
24 | }; | |
25 | ||
26 | static match_table_t tokens = { | |
27 | { opt_creator, "creator=%s" }, | |
28 | { opt_type, "type=%s" }, | |
29 | { opt_umask, "umask=%o" }, | |
30 | { opt_uid, "uid=%u" }, | |
31 | { opt_gid, "gid=%u" }, | |
32 | { opt_part, "part=%u" }, | |
33 | { opt_session, "session=%u" }, | |
34 | { opt_nls, "nls=%s" }, | |
35 | { opt_decompose, "decompose" }, | |
36 | { opt_nodecompose, "nodecompose" }, | |
37 | { opt_err, NULL } | |
38 | }; | |
39 | ||
40 | /* Initialize an options object to reasonable defaults */ | |
41 | void fill_defaults(struct hfsplus_sb_info *opts) | |
42 | { | |
43 | if (!opts) | |
44 | return; | |
45 | ||
46 | opts->creator = HFSPLUS_DEF_CR_TYPE; | |
47 | opts->type = HFSPLUS_DEF_CR_TYPE; | |
48 | opts->umask = current->fs->umask; | |
49 | opts->uid = current->uid; | |
50 | opts->gid = current->gid; | |
51 | opts->part = -1; | |
52 | opts->session = -1; | |
53 | } | |
54 | ||
55 | /* convert a "four byte character" to a 32 bit int with error checks */ | |
56 | static inline int match_fourchar(substring_t *arg, u32 *result) | |
57 | { | |
58 | if (arg->to - arg->from != 4) | |
59 | return -EINVAL; | |
60 | memcpy(result, arg->from, 4); | |
61 | return 0; | |
62 | } | |
63 | ||
64 | /* Parse options from mount. Returns 0 on failure */ | |
65 | /* input is the options passed to mount() as a string */ | |
66 | int parse_options(char *input, struct hfsplus_sb_info *sbi) | |
67 | { | |
68 | char *p; | |
69 | substring_t args[MAX_OPT_ARGS]; | |
70 | int tmp, token; | |
71 | ||
72 | if (!input) | |
73 | goto done; | |
74 | ||
75 | while ((p = strsep(&input, ",")) != NULL) { | |
76 | if (!*p) | |
77 | continue; | |
78 | ||
79 | token = match_token(p, tokens, args); | |
80 | switch (token) { | |
81 | case opt_creator: | |
82 | if (match_fourchar(&args[0], &sbi->creator)) { | |
83 | printk("HFS+-fs: creator requires a 4 character value\n"); | |
84 | return 0; | |
85 | } | |
86 | break; | |
87 | case opt_type: | |
88 | if (match_fourchar(&args[0], &sbi->type)) { | |
89 | printk("HFS+-fs: type requires a 4 character value\n"); | |
90 | return 0; | |
91 | } | |
92 | break; | |
93 | case opt_umask: | |
94 | if (match_octal(&args[0], &tmp)) { | |
95 | printk("HFS+-fs: umask requires a value\n"); | |
96 | return 0; | |
97 | } | |
98 | sbi->umask = (umode_t)tmp; | |
99 | break; | |
100 | case opt_uid: | |
101 | if (match_int(&args[0], &tmp)) { | |
102 | printk("HFS+-fs: uid requires an argument\n"); | |
103 | return 0; | |
104 | } | |
105 | sbi->uid = (uid_t)tmp; | |
106 | break; | |
107 | case opt_gid: | |
108 | if (match_int(&args[0], &tmp)) { | |
109 | printk("HFS+-fs: gid requires an argument\n"); | |
110 | return 0; | |
111 | } | |
112 | sbi->gid = (gid_t)tmp; | |
113 | break; | |
114 | case opt_part: | |
115 | if (match_int(&args[0], &sbi->part)) { | |
116 | printk("HFS+-fs: part requires an argument\n"); | |
117 | return 0; | |
118 | } | |
119 | break; | |
120 | case opt_session: | |
121 | if (match_int(&args[0], &sbi->session)) { | |
122 | printk("HFS+-fs: session requires an argument\n"); | |
123 | return 0; | |
124 | } | |
125 | break; | |
126 | case opt_nls: | |
127 | if (sbi->nls) { | |
128 | printk("HFS+-fs: unable to change nls mapping\n"); | |
129 | return 0; | |
130 | } | |
131 | p = match_strdup(&args[0]); | |
132 | sbi->nls = load_nls(p); | |
133 | if (!sbi->nls) { | |
134 | printk("HFS+-fs: unable to load nls mapping \"%s\"\n", p); | |
135 | kfree(p); | |
136 | return 0; | |
137 | } | |
138 | kfree(p); | |
139 | break; | |
140 | case opt_decompose: | |
141 | sbi->flags &= ~HFSPLUS_SB_NODECOMPOSE; | |
142 | break; | |
143 | case opt_nodecompose: | |
144 | sbi->flags |= HFSPLUS_SB_NODECOMPOSE; | |
145 | break; | |
146 | default: | |
147 | return 0; | |
148 | } | |
149 | } | |
150 | ||
151 | done: | |
152 | if (!sbi->nls) { | |
153 | /* try utf8 first, as this is the old default behaviour */ | |
154 | sbi->nls = load_nls("utf8"); | |
155 | if (!sbi->nls) | |
156 | sbi->nls = load_nls_default(); | |
157 | if (!sbi->nls) | |
158 | return 0; | |
159 | } | |
160 | ||
161 | return 1; | |
162 | } |