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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)) {
Roman Zippel634725a2006-01-18 17:43:05 -0800116 printk(KERN_ERR "hfs: 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)) {
Roman Zippel634725a2006-01-18 17:43:05 -0800122 printk(KERN_ERR "hfs: 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)) {
Roman Zippel634725a2006-01-18 17:43:05 -0800128 printk(KERN_ERR "hfs: 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)) {
Roman Zippel634725a2006-01-18 17:43:05 -0800135 printk(KERN_ERR "hfs: uid requires an argument\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700136 return 0;
137 }
138 sbi->uid = (uid_t)tmp;
139 break;
140 case opt_gid:
141 if (match_int(&args[0], &tmp)) {
Roman Zippel634725a2006-01-18 17:43:05 -0800142 printk(KERN_ERR "hfs: gid requires an argument\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700143 return 0;
144 }
145 sbi->gid = (gid_t)tmp;
146 break;
147 case opt_part:
148 if (match_int(&args[0], &sbi->part)) {
Roman Zippel634725a2006-01-18 17:43:05 -0800149 printk(KERN_ERR "hfs: part requires an argument\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700150 return 0;
151 }
152 break;
153 case opt_session:
154 if (match_int(&args[0], &sbi->session)) {
Roman Zippel634725a2006-01-18 17:43:05 -0800155 printk(KERN_ERR "hfs: session requires an argument\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700156 return 0;
157 }
158 break;
159 case opt_nls:
160 if (sbi->nls) {
Roman Zippel634725a2006-01-18 17:43:05 -0800161 printk(KERN_ERR "hfs: unable to change nls mapping\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700162 return 0;
163 }
164 p = match_strdup(&args[0]);
Jim Meyeringcd6fda32008-04-29 00:59:08 -0700165 if (p)
166 sbi->nls = load_nls(p);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700167 if (!sbi->nls) {
Anton Salikhmetov2753cc22010-12-16 18:08:38 +0200168 printk(KERN_ERR "hfs: unable to load "
169 "nls mapping \"%s\"\n",
170 p);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700171 kfree(p);
172 return 0;
173 }
174 kfree(p);
175 break;
176 case opt_decompose:
Christoph Hellwig84adede2010-10-01 05:45:20 +0200177 clear_bit(HFSPLUS_SB_NODECOMPOSE, &sbi->flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700178 break;
179 case opt_nodecompose:
Christoph Hellwig84adede2010-10-01 05:45:20 +0200180 set_bit(HFSPLUS_SB_NODECOMPOSE, &sbi->flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700181 break;
Christoph Hellwig34a2d312010-11-23 14:38:21 +0100182 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;
Roman Zippelb0b623c2005-11-29 19:34:41 -0800188 case opt_force:
Christoph Hellwig84adede2010-10-01 05:45:20 +0200189 set_bit(HFSPLUS_SB_FORCE, &sbi->flags);
Roman Zippelb0b623c2005-11-29 19:34:41 -0800190 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700191 default:
192 return 0;
193 }
194 }
195
196done:
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}
Roman Zippel717dd80e2005-09-06 15:18:48 -0700208
Al Viro34c80b12011-12-08 21:32:45 -0500209int hfsplus_show_options(struct seq_file *seq, struct dentry *root)
Roman Zippel717dd80e2005-09-06 15:18:48 -0700210{
Al Viro34c80b12011-12-08 21:32:45 -0500211 struct hfsplus_sb_info *sbi = HFSPLUS_SB(root->d_sb);
Roman Zippel717dd80e2005-09-06 15:18:48 -0700212
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);
Anton Salikhmetov2753cc22010-12-16 18:08:38 +0200217 seq_printf(seq, ",umask=%o,uid=%u,gid=%u", sbi->umask,
218 sbi->uid, sbi->gid);
Roman Zippel717dd80e2005-09-06 15:18:48 -0700219 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);
Christoph Hellwig84adede2010-10-01 05:45:20 +0200225 if (test_bit(HFSPLUS_SB_NODECOMPOSE, &sbi->flags))
Roman Zippel717dd80e2005-09-06 15:18:48 -0700226 seq_printf(seq, ",nodecompose");
Christoph Hellwig34a2d312010-11-23 14:38:21 +0100227 if (test_bit(HFSPLUS_SB_NOBARRIER, &sbi->flags))
228 seq_printf(seq, ",nobarrier");
Roman Zippel717dd80e2005-09-06 15:18:48 -0700229 return 0;
230}