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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
21enum {
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
30static 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
48void 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
63static 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
71int 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 1;
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
98
99int 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 pr_err("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 pr_err("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 pr_err("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 pr_err("uid requires an argument\n");
136 return 0;
137 }
138 sbi->uid = make_kuid(current_user_ns(), (uid_t)tmp);
139 if (!uid_valid(sbi->uid)) {
140 pr_err("invalid uid specified\n");
141 return 0;
142 }
143 break;
144 case opt_gid:
145 if (match_int(&args[0], &tmp)) {
146 pr_err("gid requires an argument\n");
147 return 0;
148 }
149 sbi->gid = make_kgid(current_user_ns(), (gid_t)tmp);
150 if (!gid_valid(sbi->gid)) {
151 pr_err("invalid gid specified\n");
152 return 0;
153 }
154 break;
155 case opt_part:
156 if (match_int(&args[0], &sbi->part)) {
157 pr_err("part requires an argument\n");
158 return 0;
159 }
160 break;
161 case opt_session:
162 if (match_int(&args[0], &sbi->session)) {
163 pr_err("session requires an argument\n");
164 return 0;
165 }
166 break;
167 case opt_nls:
168 if (sbi->nls) {
169 pr_err("unable to change nls mapping\n");
170 return 0;
171 }
172 p = match_strdup(&args[0]);
173 if (p)
174 sbi->nls = load_nls(p);
175 if (!sbi->nls) {
176 pr_err("unable to load nls mapping \"%s\"\n",
177 p);
178 kfree(p);
179 return 0;
180 }
181 kfree(p);
182 break;
183 case opt_decompose:
184 clear_bit(HFSPLUS_SB_NODECOMPOSE, &sbi->flags);
185 break;
186 case opt_nodecompose:
187 set_bit(HFSPLUS_SB_NODECOMPOSE, &sbi->flags);
188 break;
189 case opt_barrier:
190 clear_bit(HFSPLUS_SB_NOBARRIER, &sbi->flags);
191 break;
192 case opt_nobarrier:
193 set_bit(HFSPLUS_SB_NOBARRIER, &sbi->flags);
194 break;
195 case opt_force:
196 set_bit(HFSPLUS_SB_FORCE, &sbi->flags);
197 break;
198 default:
199 return 0;
200 }
201 }
202
203done:
204 if (!sbi->nls) {
205
206 sbi->nls = load_nls("utf8");
207 if (!sbi->nls)
208 sbi->nls = load_nls_default();
209 if (!sbi->nls)
210 return 0;
211 }
212
213 return 1;
214}
215
216int hfsplus_show_options(struct seq_file *seq, struct dentry *root)
217{
218 struct hfsplus_sb_info *sbi = HFSPLUS_SB(root->d_sb);
219
220 if (sbi->creator != HFSPLUS_DEF_CR_TYPE)
221 seq_show_option_n(seq, "creator", (char *)&sbi->creator, 4);
222 if (sbi->type != HFSPLUS_DEF_CR_TYPE)
223 seq_show_option_n(seq, "type", (char *)&sbi->type, 4);
224 seq_printf(seq, ",umask=%o,uid=%u,gid=%u", sbi->umask,
225 from_kuid_munged(&init_user_ns, sbi->uid),
226 from_kgid_munged(&init_user_ns, sbi->gid));
227 if (sbi->part >= 0)
228 seq_printf(seq, ",part=%u", sbi->part);
229 if (sbi->session >= 0)
230 seq_printf(seq, ",session=%u", sbi->session);
231 if (sbi->nls)
232 seq_printf(seq, ",nls=%s", sbi->nls->charset);
233 if (test_bit(HFSPLUS_SB_NODECOMPOSE, &sbi->flags))
234 seq_puts(seq, ",nodecompose");
235 if (test_bit(HFSPLUS_SB_NOBARRIER, &sbi->flags))
236 seq_puts(seq, ",nobarrier");
237 return 0;
238}
239
