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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>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090018#include <linux/slab.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070019#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,
Christoph Hellwig34a2d312010-11-23 14:38:21 +010026 opt_barrier, opt_nobarrier,
Roman Zippelb0b623c2005-11-29 19:34:41 -080027 opt_force, opt_err
Linus Torvalds1da177e2005-04-16 15:20:36 -070028};
29
Steven Whitehousea447c092008-10-13 10:46:57 +010030static const match_table_t tokens = {
Linus Torvalds1da177e2005-04-16 15:20:36 -070031 { 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" },
Christoph Hellwig34a2d312010-11-23 14:38:21 +010041 { opt_barrier, "barrier" },
42 { opt_nobarrier, "nobarrier" },
Roman Zippelb0b623c2005-11-29 19:34:41 -080043 { opt_force, "force" },
Linus Torvalds1da177e2005-04-16 15:20:36 -070044 { opt_err, NULL }
45};
46
47/* Initialize an options object to reasonable defaults */
Roman Zippel717dd80e2005-09-06 15:18:48 -070048void hfsplus_fill_defaults(struct hfsplus_sb_info *opts)
Linus Torvalds1da177e2005-04-16 15:20:36 -070049{
50 if (!opts)
51 return;
52
53 opts->creator = HFSPLUS_DEF_CR_TYPE;
54 opts->type = HFSPLUS_DEF_CR_TYPE;
Al Viroce3b0f82009-03-29 19:08:22 -040055 opts->umask = current_umask();
David Howells4ac84892008-11-14 10:38:54 +110056 opts->uid = current_uid();
57 opts->gid = current_gid();
Linus Torvalds1da177e2005-04-16 15:20:36 -070058 opts->part = -1;
59 opts->session = -1;
60}
61
62/* convert a "four byte character" to a 32 bit int with error checks */
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
Christoph Hellwig6f80dfe2010-11-07 23:01:17 +010071int 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
Linus Torvalds1da177e2005-04-16 15:20:36 -070097/* Parse options from mount. Returns 0 on failure */
98/* input is the options passed to mount() as a string */
Roman Zippel717dd80e2005-09-06 15:18:48 -070099int hfsplus_parse_options(char *input, struct hfsplus_sb_info *sbi)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700100{
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)) {
Joe Perchesd6142672013-04-30 15:27:55 -0700116 pr_err("creator requires a 4 character value\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700117 return 0;
118 }
119 break;
120 case opt_type:
121 if (match_fourchar(&args[0], &sbi->type)) {
Joe Perchesd6142672013-04-30 15:27:55 -0700122 pr_err("type requires a 4 character value\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700123 return 0;
124 }
125 break;
126 case opt_umask:
127 if (match_octal(&args[0], &tmp)) {
Joe Perchesd6142672013-04-30 15:27:55 -0700128 pr_err("umask requires a value\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700129 return 0;
130 }
131 sbi->umask = (umode_t)tmp;
132 break;
133 case opt_uid:
134 if (match_int(&args[0], &tmp)) {
Joe Perchesd6142672013-04-30 15:27:55 -0700135 pr_err("uid requires an argument\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700136 return 0;
137 }
Eric W. Biederman16525e32012-02-07 16:27:17 -0800138 sbi->uid = make_kuid(current_user_ns(), (uid_t)tmp);
139 if (!uid_valid(sbi->uid)) {
Joe Perchesd6142672013-04-30 15:27:55 -0700140 pr_err("invalid uid specified\n");
Eric W. Biederman16525e32012-02-07 16:27:17 -0800141 return 0;
142 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700143 break;
144 case opt_gid:
145 if (match_int(&args[0], &tmp)) {
Joe Perchesd6142672013-04-30 15:27:55 -0700146 pr_err("gid requires an argument\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700147 return 0;
148 }
Eric W. Biederman16525e32012-02-07 16:27:17 -0800149 sbi->gid = make_kgid(current_user_ns(), (gid_t)tmp);
150 if (!gid_valid(sbi->gid)) {
Joe Perchesd6142672013-04-30 15:27:55 -0700151 pr_err("invalid gid specified\n");
Eric W. Biederman16525e32012-02-07 16:27:17 -0800152 return 0;
153 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700154 break;
155 case opt_part:
156 if (match_int(&args[0], &sbi->part)) {
Joe Perchesd6142672013-04-30 15:27:55 -0700157 pr_err("part requires an argument\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700158 return 0;
159 }
160 break;
161 case opt_session:
162 if (match_int(&args[0], &sbi->session)) {
Joe Perchesd6142672013-04-30 15:27:55 -0700163 pr_err("session requires an argument\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700164 return 0;
165 }
166 break;
167 case opt_nls:
168 if (sbi->nls) {
Joe Perchesd6142672013-04-30 15:27:55 -0700169 pr_err("unable to change nls mapping\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700170 return 0;
171 }
172 p = match_strdup(&args[0]);
Jim Meyeringcd6fda32008-04-29 00:59:08 -0700173 if (p)
174 sbi->nls = load_nls(p);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700175 if (!sbi->nls) {
Joe Perchesd6142672013-04-30 15:27:55 -0700176 pr_err("unable to load "
Anton Salikhmetov2753cc22010-12-16 18:08:38 +0200177 "nls mapping \"%s\"\n",
178 p);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700179 kfree(p);
180 return 0;
181 }
182 kfree(p);
183 break;
184 case opt_decompose:
Christoph Hellwig84adede2010-10-01 05:45:20 +0200185 clear_bit(HFSPLUS_SB_NODECOMPOSE, &sbi->flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700186 break;
187 case opt_nodecompose:
Christoph Hellwig84adede2010-10-01 05:45:20 +0200188 set_bit(HFSPLUS_SB_NODECOMPOSE, &sbi->flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700189 break;
Christoph Hellwig34a2d312010-11-23 14:38:21 +0100190 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;
Roman Zippelb0b623c2005-11-29 19:34:41 -0800196 case opt_force:
Christoph Hellwig84adede2010-10-01 05:45:20 +0200197 set_bit(HFSPLUS_SB_FORCE, &sbi->flags);
Roman Zippelb0b623c2005-11-29 19:34:41 -0800198 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700199 default:
200 return 0;
201 }
202 }
203
204done:
205 if (!sbi->nls) {
206 /* try utf8 first, as this is the old default behaviour */
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}
Roman Zippel717dd80e2005-09-06 15:18:48 -0700216
Al Viro34c80b12011-12-08 21:32:45 -0500217int hfsplus_show_options(struct seq_file *seq, struct dentry *root)
Roman Zippel717dd80e2005-09-06 15:18:48 -0700218{
Al Viro34c80b12011-12-08 21:32:45 -0500219 struct hfsplus_sb_info *sbi = HFSPLUS_SB(root->d_sb);
Roman Zippel717dd80e2005-09-06 15:18:48 -0700220
221 if (sbi->creator != HFSPLUS_DEF_CR_TYPE)
222 seq_printf(seq, ",creator=%.4s", (char *)&sbi->creator);
223 if (sbi->type != HFSPLUS_DEF_CR_TYPE)
224 seq_printf(seq, ",type=%.4s", (char *)&sbi->type);
Anton Salikhmetov2753cc22010-12-16 18:08:38 +0200225 seq_printf(seq, ",umask=%o,uid=%u,gid=%u", sbi->umask,
Eric W. Biederman16525e32012-02-07 16:27:17 -0800226 from_kuid_munged(&init_user_ns, sbi->uid),
227 from_kgid_munged(&init_user_ns, sbi->gid));
Roman Zippel717dd80e2005-09-06 15:18:48 -0700228 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);
Christoph Hellwig84adede2010-10-01 05:45:20 +0200234 if (test_bit(HFSPLUS_SB_NODECOMPOSE, &sbi->flags))
Roman Zippel717dd80e2005-09-06 15:18:48 -0700235 seq_printf(seq, ",nodecompose");
Christoph Hellwig34a2d312010-11-23 14:38:21 +0100236 if (test_bit(HFSPLUS_SB_NOBARRIER, &sbi->flags))
237 seq_printf(seq, ",nobarrier");
Roman Zippel717dd80e2005-09-06 15:18:48 -0700238 return 0;
239}