Pull sim-fixes into release branch
[linux-2.6] / fs / hfsplus / options.c
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 <linux/mount.h>
17 #include <linux/seq_file.h>
18 #include "hfsplus_fs.h"
19
20 enum {
21         opt_creator, opt_type,
22         opt_umask, opt_uid, opt_gid,
23         opt_part, opt_session, opt_nls,
24         opt_nodecompose, opt_decompose,
25         opt_err
26 };
27
28 static match_table_t tokens = {
29         { opt_creator, "creator=%s" },
30         { opt_type, "type=%s" },
31         { opt_umask, "umask=%o" },
32         { opt_uid, "uid=%u" },
33         { opt_gid, "gid=%u" },
34         { opt_part, "part=%u" },
35         { opt_session, "session=%u" },
36         { opt_nls, "nls=%s" },
37         { opt_decompose, "decompose" },
38         { opt_nodecompose, "nodecompose" },
39         { opt_err, NULL }
40 };
41
42 /* Initialize an options object to reasonable defaults */
43 void hfsplus_fill_defaults(struct hfsplus_sb_info *opts)
44 {
45         if (!opts)
46                 return;
47
48         opts->creator = HFSPLUS_DEF_CR_TYPE;
49         opts->type = HFSPLUS_DEF_CR_TYPE;
50         opts->umask = current->fs->umask;
51         opts->uid = current->uid;
52         opts->gid = current->gid;
53         opts->part = -1;
54         opts->session = -1;
55 }
56
57 /* convert a "four byte character" to a 32 bit int with error checks */
58 static inline int match_fourchar(substring_t *arg, u32 *result)
59 {
60         if (arg->to - arg->from != 4)
61                 return -EINVAL;
62         memcpy(result, arg->from, 4);
63         return 0;
64 }
65
66 /* Parse options from mount. Returns 0 on failure */
67 /* input is the options passed to mount() as a string */
68 int hfsplus_parse_options(char *input, struct hfsplus_sb_info *sbi)
69 {
70         char *p;
71         substring_t args[MAX_OPT_ARGS];
72         int tmp, token;
73
74         if (!input)
75                 goto done;
76
77         while ((p = strsep(&input, ",")) != NULL) {
78                 if (!*p)
79                         continue;
80
81                 token = match_token(p, tokens, args);
82                 switch (token) {
83                 case opt_creator:
84                         if (match_fourchar(&args[0], &sbi->creator)) {
85                                 printk("HFS+-fs: creator requires a 4 character value\n");
86                                 return 0;
87                         }
88                         break;
89                 case opt_type:
90                         if (match_fourchar(&args[0], &sbi->type)) {
91                                 printk("HFS+-fs: type requires a 4 character value\n");
92                                 return 0;
93                         }
94                         break;
95                 case opt_umask:
96                         if (match_octal(&args[0], &tmp)) {
97                                 printk("HFS+-fs: umask requires a value\n");
98                                 return 0;
99                         }
100                         sbi->umask = (umode_t)tmp;
101                         break;
102                 case opt_uid:
103                         if (match_int(&args[0], &tmp)) {
104                                 printk("HFS+-fs: uid requires an argument\n");
105                                 return 0;
106                         }
107                         sbi->uid = (uid_t)tmp;
108                         break;
109                 case opt_gid:
110                         if (match_int(&args[0], &tmp)) {
111                                 printk("HFS+-fs: gid requires an argument\n");
112                                 return 0;
113                         }
114                         sbi->gid = (gid_t)tmp;
115                         break;
116                 case opt_part:
117                         if (match_int(&args[0], &sbi->part)) {
118                                 printk("HFS+-fs: part requires an argument\n");
119                                 return 0;
120                         }
121                         break;
122                 case opt_session:
123                         if (match_int(&args[0], &sbi->session)) {
124                                 printk("HFS+-fs: session requires an argument\n");
125                                 return 0;
126                         }
127                         break;
128                 case opt_nls:
129                         if (sbi->nls) {
130                                 printk("HFS+-fs: unable to change nls mapping\n");
131                                 return 0;
132                         }
133                         p = match_strdup(&args[0]);
134                         sbi->nls = load_nls(p);
135                         if (!sbi->nls) {
136                                 printk("HFS+-fs: unable to load nls mapping \"%s\"\n", p);
137                                 kfree(p);
138                                 return 0;
139                         }
140                         kfree(p);
141                         break;
142                 case opt_decompose:
143                         sbi->flags &= ~HFSPLUS_SB_NODECOMPOSE;
144                         break;
145                 case opt_nodecompose:
146                         sbi->flags |= HFSPLUS_SB_NODECOMPOSE;
147                         break;
148                 default:
149                         return 0;
150                 }
151         }
152
153 done:
154         if (!sbi->nls) {
155                 /* try utf8 first, as this is the old default behaviour */
156                 sbi->nls = load_nls("utf8");
157                 if (!sbi->nls)
158                         sbi->nls = load_nls_default();
159                 if (!sbi->nls)
160                         return 0;
161         }
162
163         return 1;
164 }
165
166 int hfsplus_show_options(struct seq_file *seq, struct vfsmount *mnt)
167 {
168         struct hfsplus_sb_info *sbi = &HFSPLUS_SB(mnt->mnt_sb);
169
170         if (sbi->creator != HFSPLUS_DEF_CR_TYPE)
171                 seq_printf(seq, ",creator=%.4s", (char *)&sbi->creator);
172         if (sbi->type != HFSPLUS_DEF_CR_TYPE)
173                 seq_printf(seq, ",type=%.4s", (char *)&sbi->type);
174         seq_printf(seq, ",umask=%o,uid=%u,gid=%u", sbi->umask, sbi->uid, sbi->gid);
175         if (sbi->part >= 0)
176                 seq_printf(seq, ",part=%u", sbi->part);
177         if (sbi->session >= 0)
178                 seq_printf(seq, ",session=%u", sbi->session);
179         if (sbi->nls)
180                 seq_printf(seq, ",nls=%s", sbi->nls->charset);
181         if (sbi->flags & HFSPLUS_SB_NODECOMPOSE)
182                 seq_printf(seq, ",nodecompose");
183         return 0;
184 }