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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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>
Roman Zippel717dd80e2005-09-06 15:18:48 -070016#include <linux/mount.h>
17#include <linux/seq_file.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070018#include "hfsplus_fs.h"
19
20enum {
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
28static 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 */
Roman Zippel717dd80e2005-09-06 15:18:48 -070043void hfsplus_fill_defaults(struct hfsplus_sb_info *opts)
Linus Torvalds1da177e2005-04-16 15:20:36 -070044{
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 */
58static 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 */
Roman Zippel717dd80e2005-09-06 15:18:48 -070068int hfsplus_parse_options(char *input, struct hfsplus_sb_info *sbi)
Linus Torvalds1da177e2005-04-16 15:20:36 -070069{
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
153done:
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}
Roman Zippel717dd80e2005-09-06 15:18:48 -0700165
166int 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}