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 "hfsplus_fs.h" 19 20 enum { 21 opt_creator, opt_type, 22 opt_umask, opt_uid, opt_gid, 23 opt_part, opt_session, opt_nls, 24 opt_nodecompose, opt_decompose, 25 opt_force, opt_err 26 }; 27 28 static const match_table_t tokens = { 29 { opt_creator, "creator=%s" }, 30 { opt_type, "type=%s" }, 31 { opt_umask, "umask=%o" }, 32 { opt_uid, "uid=%u" }, 33 { opt_gid, "gid=%u" }, 34 { opt_part, "part=%u" }, 35 { opt_session, "session=%u" }, 36 { opt_nls, "nls=%s" }, 37 { opt_decompose, "decompose" }, 38 { opt_nodecompose, "nodecompose" }, 39 { opt_force, "force" }, 40 { opt_err, NULL } 41 }; 42 43 /* Initialize an options object to reasonable defaults */ 44 void hfsplus_fill_defaults(struct hfsplus_sb_info *opts) 45 { 46 if (!opts) 47 return; 48 49 opts->creator = HFSPLUS_DEF_CR_TYPE; 50 opts->type = HFSPLUS_DEF_CR_TYPE; 51 opts->umask = current_umask(); 52 opts->uid = current_uid(); 53 opts->gid = current_gid(); 54 opts->part = -1; 55 opts->session = -1; 56 } 57 58 /* convert a "four byte character" to a 32 bit int with error checks */ 59 static inline int match_fourchar(substring_t *arg, u32 *result) 60 { 61 if (arg->to - arg->from != 4) 62 return -EINVAL; 63 memcpy(result, arg->from, 4); 64 return 0; 65 } 66 67 /* Parse options from mount. Returns 0 on failure */ 68 /* input is the options passed to mount() as a string */ 69 int hfsplus_parse_options(char *input, struct hfsplus_sb_info *sbi) 70 { 71 char *p; 72 substring_t args[MAX_OPT_ARGS]; 73 int tmp, token; 74 75 if (!input) 76 goto done; 77 78 while ((p = strsep(&input, ",")) != NULL) { 79 if (!*p) 80 continue; 81 82 token = match_token(p, tokens, args); 83 switch (token) { 84 case opt_creator: 85 if (match_fourchar(&args[0], &sbi->creator)) { 86 printk(KERN_ERR "hfs: creator requires a 4 character value\n"); 87 return 0; 88 } 89 break; 90 case opt_type: 91 if (match_fourchar(&args[0], &sbi->type)) { 92 printk(KERN_ERR "hfs: type requires a 4 character value\n"); 93 return 0; 94 } 95 break; 96 case opt_umask: 97 if (match_octal(&args[0], &tmp)) { 98 printk(KERN_ERR "hfs: umask requires a value\n"); 99 return 0; 100 } 101 sbi->umask = (umode_t)tmp; 102 break; 103 case opt_uid: 104 if (match_int(&args[0], &tmp)) { 105 printk(KERN_ERR "hfs: uid requires an argument\n"); 106 return 0; 107 } 108 sbi->uid = (uid_t)tmp; 109 break; 110 case opt_gid: 111 if (match_int(&args[0], &tmp)) { 112 printk(KERN_ERR "hfs: gid requires an argument\n"); 113 return 0; 114 } 115 sbi->gid = (gid_t)tmp; 116 break; 117 case opt_part: 118 if (match_int(&args[0], &sbi->part)) { 119 printk(KERN_ERR "hfs: part requires an argument\n"); 120 return 0; 121 } 122 break; 123 case opt_session: 124 if (match_int(&args[0], &sbi->session)) { 125 printk(KERN_ERR "hfs: session requires an argument\n"); 126 return 0; 127 } 128 break; 129 case opt_nls: 130 if (sbi->nls) { 131 printk(KERN_ERR "hfs: unable to change nls mapping\n"); 132 return 0; 133 } 134 p = match_strdup(&args[0]); 135 if (p) 136 sbi->nls = load_nls(p); 137 if (!sbi->nls) { 138 printk(KERN_ERR "hfs: unable to load nls mapping \"%s\"\n", p); 139 kfree(p); 140 return 0; 141 } 142 kfree(p); 143 break; 144 case opt_decompose: 145 sbi->flags &= ~HFSPLUS_SB_NODECOMPOSE; 146 break; 147 case opt_nodecompose: 148 sbi->flags |= HFSPLUS_SB_NODECOMPOSE; 149 break; 150 case opt_force: 151 sbi->flags |= HFSPLUS_SB_FORCE; 152 break; 153 default: 154 return 0; 155 } 156 } 157 158 done: 159 if (!sbi->nls) { 160 /* try utf8 first, as this is the old default behaviour */ 161 sbi->nls = load_nls("utf8"); 162 if (!sbi->nls) 163 sbi->nls = load_nls_default(); 164 if (!sbi->nls) 165 return 0; 166 } 167 168 return 1; 169 } 170 171 int hfsplus_show_options(struct seq_file *seq, struct vfsmount *mnt) 172 { 173 struct hfsplus_sb_info *sbi = &HFSPLUS_SB(mnt->mnt_sb); 174 175 if (sbi->creator != HFSPLUS_DEF_CR_TYPE) 176 seq_printf(seq, ",creator=%.4s", (char *)&sbi->creator); 177 if (sbi->type != HFSPLUS_DEF_CR_TYPE) 178 seq_printf(seq, ",type=%.4s", (char *)&sbi->type); 179 seq_printf(seq, ",umask=%o,uid=%u,gid=%u", sbi->umask, sbi->uid, sbi->gid); 180 if (sbi->part >= 0) 181 seq_printf(seq, ",part=%u", sbi->part); 182 if (sbi->session >= 0) 183 seq_printf(seq, ",session=%u", sbi->session); 184 if (sbi->nls) 185 seq_printf(seq, ",nls=%s", sbi->nls->charset); 186 if (sbi->flags & HFSPLUS_SB_NODECOMPOSE) 187 seq_printf(seq, ",nodecompose"); 188 return 0; 189 } 190