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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 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
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 "
177 "nls mapping \"%s\"\n",
178 p);
179 kfree(p);
180 return 0;
181 }
182 kfree(p);
183 break;
184 case opt_decompose:
185 clear_bit(HFSPLUS_SB_NODECOMPOSE, &sbi->flags);
186 break;
187 case opt_nodecompose:
188 set_bit(HFSPLUS_SB_NODECOMPOSE, &sbi->flags);
189 break;
190 case opt_barrier:
191 clear_bit(HFSPLUS_SB_NOBARRIER, &sbi->flags);
192 break;
193 case opt_nobarrier:
194 set_bit(HFSPLUS_SB_NOBARRIER, &sbi->flags);
195 break;
196 case opt_force:
197 set_bit(HFSPLUS_SB_FORCE, &sbi->flags);
198 break;
199 default:
200 return 0;
201 }
202 }
203
204done:
205 if (!sbi->nls) {
206
207 sbi->nls = load_nls("utf8");
208 if (!sbi->nls)
209 sbi->nls = load_nls_default();
210 if (!sbi->nls)
211 return 0;
212 }
213
214 return 1;
215}
216
217int hfsplus_show_options(struct seq_file *seq, struct dentry *root)
218{
219 struct hfsplus_sb_info *sbi = HFSPLUS_SB(root->d_sb);
220
221 if (sbi->creator != HFSPLUS_DEF_CR_TYPE)
222 seq_show_option_n(seq, "creator", (char *)&sbi->creator, 4);
223 if (sbi->type != HFSPLUS_DEF_CR_TYPE)
224 seq_show_option_n(seq, "type", (char *)&sbi->type, 4);
225 seq_printf(seq, ",umask=%o,uid=%u,gid=%u", sbi->umask,
226 from_kuid_munged(&init_user_ns, sbi->uid),
227 from_kgid_munged(&init_user_ns, sbi->gid));
228 if (sbi->part >= 0)
229 seq_printf(seq, ",part=%u", sbi->part);
230 if (sbi->session >= 0)
231 seq_printf(seq, ",session=%u", sbi->session);
232 if (sbi->nls)
233 seq_printf(seq, ",nls=%s", sbi->nls->charset);
234 if (test_bit(HFSPLUS_SB_NODECOMPOSE, &sbi->flags))
235 seq_printf(seq, ",nodecompose");
236 if (test_bit(HFSPLUS_SB_NOBARRIER, &sbi->flags))
237 seq_printf(seq, ",nobarrier");
238 return 0;
239}
240
