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_force, opt_err 27 }; 28 29 static const match_table_t tokens = { 30 { opt_creator, "creator=%s" }, 31 { opt_type, "type=%s" }, 32 { opt_umask, "umask=%o" }, 33 { opt_uid, "uid=%u" }, 34 { opt_gid, "gid=%u" }, 35 { opt_part, "part=%u" }, 36 { opt_session, "session=%u" }, 37 { opt_nls, "nls=%s" }, 38 { opt_decompose, "decompose" }, 39 { opt_nodecompose, "nodecompose" }, 40 { opt_force, "force" }, 41 { opt_err, NULL } 42 }; 43 44 /* Initialize an options object to reasonable defaults */ 45 void hfsplus_fill_defaults(struct hfsplus_sb_info *opts) 46 { 47 if (!opts) 48 return; 49 50 opts->creator = HFSPLUS_DEF_CR_TYPE; 51 opts->type = HFSPLUS_DEF_CR_TYPE; 52 opts->umask = current_umask(); 53 opts->uid = current_uid(); 54 opts->gid = current_gid(); 55 opts->part = -1; 56 opts->session = -1; 57 } 58 59 /* convert a "four byte character" to a 32 bit int with error checks */ 60 static inline int match_fourchar(substring_t *arg, u32 *result) 61 { 62 if (arg->to - arg->from != 4) 63 return -EINVAL; 64 memcpy(result, arg->from, 4); 65 return 0; 66 } 67 68 /* Parse options from mount. Returns 0 on failure */ 69 /* input is the options passed to mount() as a string */ 70 int hfsplus_parse_options(char *input, struct hfsplus_sb_info *sbi) 71 { 72 char *p; 73 substring_t args[MAX_OPT_ARGS]; 74 int tmp, token; 75 76 if (!input) 77 goto done; 78 79 while ((p = strsep(&input, ",")) != NULL) { 80 if (!*p) 81 continue; 82 83 token = match_token(p, tokens, args); 84 switch (token) { 85 case opt_creator: 86 if (match_fourchar(&args[0], &sbi->creator)) { 87 printk(KERN_ERR "hfs: creator requires a 4 character value\n"); 88 return 0; 89 } 90 break; 91 case opt_type: 92 if (match_fourchar(&args[0], &sbi->type)) { 93 printk(KERN_ERR "hfs: type requires a 4 character value\n"); 94 return 0; 95 } 96 break; 97 case opt_umask: 98 if (match_octal(&args[0], &tmp)) { 99 printk(KERN_ERR "hfs: umask requires a value\n"); 100 return 0; 101 } 102 sbi->umask = (umode_t)tmp; 103 break; 104 case opt_uid: 105 if (match_int(&args[0], &tmp)) { 106 printk(KERN_ERR "hfs: uid requires an argument\n"); 107 return 0; 108 } 109 sbi->uid = (uid_t)tmp; 110 break; 111 case opt_gid: 112 if (match_int(&args[0], &tmp)) { 113 printk(KERN_ERR "hfs: gid requires an argument\n"); 114 return 0; 115 } 116 sbi->gid = (gid_t)tmp; 117 break; 118 case opt_part: 119 if (match_int(&args[0], &sbi->part)) { 120 printk(KERN_ERR "hfs: part requires an argument\n"); 121 return 0; 122 } 123 break; 124 case opt_session: 125 if (match_int(&args[0], &sbi->session)) { 126 printk(KERN_ERR "hfs: session requires an argument\n"); 127 return 0; 128 } 129 break; 130 case opt_nls: 131 if (sbi->nls) { 132 printk(KERN_ERR "hfs: unable to change nls mapping\n"); 133 return 0; 134 } 135 p = match_strdup(&args[0]); 136 if (p) 137 sbi->nls = load_nls(p); 138 if (!sbi->nls) { 139 printk(KERN_ERR "hfs: unable to load nls mapping \"%s\"\n", p); 140 kfree(p); 141 return 0; 142 } 143 kfree(p); 144 break; 145 case opt_decompose: 146 sbi->flags &= ~HFSPLUS_SB_NODECOMPOSE; 147 break; 148 case opt_nodecompose: 149 sbi->flags |= HFSPLUS_SB_NODECOMPOSE; 150 break; 151 case opt_force: 152 sbi->flags |= HFSPLUS_SB_FORCE; 153 break; 154 default: 155 return 0; 156 } 157 } 158 159 done: 160 if (!sbi->nls) { 161 /* try utf8 first, as this is the old default behaviour */ 162 sbi->nls = load_nls("utf8"); 163 if (!sbi->nls) 164 sbi->nls = load_nls_default(); 165 if (!sbi->nls) 166 return 0; 167 } 168 169 return 1; 170 } 171 172 int hfsplus_show_options(struct seq_file *seq, struct vfsmount *mnt) 173 { 174 struct hfsplus_sb_info *sbi = &HFSPLUS_SB(mnt->mnt_sb); 175 176 if (sbi->creator != HFSPLUS_DEF_CR_TYPE) 177 seq_printf(seq, ",creator=%.4s", (char *)&sbi->creator); 178 if (sbi->type != HFSPLUS_DEF_CR_TYPE) 179 seq_printf(seq, ",type=%.4s", (char *)&sbi->type); 180 seq_printf(seq, ",umask=%o,uid=%u,gid=%u", sbi->umask, sbi->uid, sbi->gid); 181 if (sbi->part >= 0) 182 seq_printf(seq, ",part=%u", sbi->part); 183 if (sbi->session >= 0) 184 seq_printf(seq, ",session=%u", sbi->session); 185 if (sbi->nls) 186 seq_printf(seq, ",nls=%s", sbi->nls->charset); 187 if (sbi->flags & HFSPLUS_SB_NODECOMPOSE) 188 seq_printf(seq, ",nodecompose"); 189 return 0; 190 } 191