linux/fs/hfsplus/options.c
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   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
  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/* Initialize an options object to reasonable defaults */
  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/* 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
  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/* Parse options from mount. Returns 0 on failure */
  98/* input is the options passed to mount() as a string */
  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                                printk(KERN_ERR "hfs: 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                                printk(KERN_ERR "hfs: 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                                printk(KERN_ERR "hfs: 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                                printk(KERN_ERR "hfs: 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                                printk(KERN_ERR "hfs: invalid uid specified\n");
 141                                return 0;
 142                        }
 143                        break;
 144                case opt_gid:
 145                        if (match_int(&args[0], &tmp)) {
 146                                printk(KERN_ERR "hfs: 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                                printk(KERN_ERR "hfs: invalid gid specified\n");
 152                                return 0;
 153                        }
 154                        break;
 155                case opt_part:
 156                        if (match_int(&args[0], &sbi->part)) {
 157                                printk(KERN_ERR "hfs: part requires an argument\n");
 158                                return 0;
 159                        }
 160                        break;
 161                case opt_session:
 162                        if (match_int(&args[0], &sbi->session)) {
 163                                printk(KERN_ERR "hfs: session requires an argument\n");
 164                                return 0;
 165                        }
 166                        break;
 167                case opt_nls:
 168                        if (sbi->nls) {
 169                                printk(KERN_ERR "hfs: 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                                printk(KERN_ERR "hfs: 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                /* 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}
 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_printf(seq, ",creator=%.4s", (char *)&sbi->creator);
 223        if (sbi->type != HFSPLUS_DEF_CR_TYPE)
 224                seq_printf(seq, ",type=%.4s", (char *)&sbi->type);
 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
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