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 <linux/slab.h>
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,
26 opt_barrier, opt_nobarrier,
27 opt_force, opt_err
28 };
29
30 static const match_table_t tokens = {
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" },
41 { opt_barrier, "barrier" },
42 { opt_nobarrier, "nobarrier" },
43 { opt_force, "force" },
44 { opt_err, NULL }
45 };
46
47 /* Initialize an options object to reasonable defaults */
hfsplus_fill_defaults(struct hfsplus_sb_info * opts)48 void hfsplus_fill_defaults(struct hfsplus_sb_info *opts)
49 {
50 if (!opts)
51 return;
52
53 opts->creator = HFSPLUS_DEF_CR_TYPE;
54 opts->type = HFSPLUS_DEF_CR_TYPE;
55 opts->umask = current_umask();
56 opts->uid = current_uid();
57 opts->gid = current_gid();
58 opts->part = -1;
59 opts->session = -1;
60 }
61
62 /* convert a "four byte character" to a 32 bit int with error checks */
match_fourchar(substring_t * arg,u32 * result)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
hfsplus_parse_options_remount(char * input,int * force)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)
78 return 0;
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
97 /* Parse options from mount. Returns 0 on failure */
98 /* input is the options passed to mount() as a string */
hfsplus_parse_options(char * input,struct hfsplus_sb_info * sbi)99 int hfsplus_parse_options(char *input, struct hfsplus_sb_info *sbi)
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)) {
116 printk(KERN_ERR "hfs: creator requires a 4 character value\n");
117 return 0;
118 }
119 break;
120 case opt_type:
121 if (match_fourchar(&args[0], &sbi->type)) {
122 printk(KERN_ERR "hfs: type requires a 4 character value\n");
123 return 0;
124 }
125 break;
126 case opt_umask:
127 if (match_octal(&args[0], &tmp)) {
128 printk(KERN_ERR "hfs: umask requires a value\n");
129 return 0;
130 }
131 sbi->umask = (umode_t)tmp;
132 break;
133 case opt_uid:
134 if (match_int(&args[0], &tmp)) {
135 printk(KERN_ERR "hfs: uid requires an argument\n");
136 return 0;
137 }
138 sbi->uid = (uid_t)tmp;
139 break;
140 case opt_gid:
141 if (match_int(&args[0], &tmp)) {
142 printk(KERN_ERR "hfs: gid requires an argument\n");
143 return 0;
144 }
145 sbi->gid = (gid_t)tmp;
146 break;
147 case opt_part:
148 if (match_int(&args[0], &sbi->part)) {
149 printk(KERN_ERR "hfs: part requires an argument\n");
150 return 0;
151 }
152 break;
153 case opt_session:
154 if (match_int(&args[0], &sbi->session)) {
155 printk(KERN_ERR "hfs: session requires an argument\n");
156 return 0;
157 }
158 break;
159 case opt_nls:
160 if (sbi->nls) {
161 printk(KERN_ERR "hfs: unable to change nls mapping\n");
162 return 0;
163 }
164 p = match_strdup(&args[0]);
165 if (p)
166 sbi->nls = load_nls(p);
167 if (!sbi->nls) {
168 printk(KERN_ERR "hfs: unable to load "
169 "nls mapping \"%s\"\n",
170 p);
171 kfree(p);
172 return 0;
173 }
174 kfree(p);
175 break;
176 case opt_decompose:
177 clear_bit(HFSPLUS_SB_NODECOMPOSE, &sbi->flags);
178 break;
179 case opt_nodecompose:
180 set_bit(HFSPLUS_SB_NODECOMPOSE, &sbi->flags);
181 break;
182 case opt_barrier:
183 clear_bit(HFSPLUS_SB_NOBARRIER, &sbi->flags);
184 break;
185 case opt_nobarrier:
186 set_bit(HFSPLUS_SB_NOBARRIER, &sbi->flags);
187 break;
188 case opt_force:
189 set_bit(HFSPLUS_SB_FORCE, &sbi->flags);
190 break;
191 default:
192 return 0;
193 }
194 }
195
196 done:
197 if (!sbi->nls) {
198 /* try utf8 first, as this is the old default behaviour */
199 sbi->nls = load_nls("utf8");
200 if (!sbi->nls)
201 sbi->nls = load_nls_default();
202 if (!sbi->nls)
203 return 0;
204 }
205
206 return 1;
207 }
208
hfsplus_show_options(struct seq_file * seq,struct vfsmount * mnt)209 int hfsplus_show_options(struct seq_file *seq, struct vfsmount *mnt)
210 {
211 struct hfsplus_sb_info *sbi = HFSPLUS_SB(mnt->mnt_sb);
212
213 if (sbi->creator != HFSPLUS_DEF_CR_TYPE)
214 seq_printf(seq, ",creator=%.4s", (char *)&sbi->creator);
215 if (sbi->type != HFSPLUS_DEF_CR_TYPE)
216 seq_printf(seq, ",type=%.4s", (char *)&sbi->type);
217 seq_printf(seq, ",umask=%o,uid=%u,gid=%u", sbi->umask,
218 sbi->uid, sbi->gid);
219 if (sbi->part >= 0)
220 seq_printf(seq, ",part=%u", sbi->part);
221 if (sbi->session >= 0)
222 seq_printf(seq, ",session=%u", sbi->session);
223 if (sbi->nls)
224 seq_printf(seq, ",nls=%s", sbi->nls->charset);
225 if (test_bit(HFSPLUS_SB_NODECOMPOSE, &sbi->flags))
226 seq_printf(seq, ",nodecompose");
227 if (test_bit(HFSPLUS_SB_NOBARRIER, &sbi->flags))
228 seq_printf(seq, ",nobarrier");
229 return 0;
230 }
231