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 "hfsplus_fs.h"
  19
  20enum {
  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
  28static 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 */
  44void 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->fs->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 */
  59static 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 */
  69int 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                        sbi->nls = load_nls(p);
 136                        if (!sbi->nls) {
 137                                printk(KERN_ERR "hfs: unable to load nls mapping \"%s\"\n", p);
 138                                kfree(p);
 139                                return 0;
 140                        }
 141                        kfree(p);
 142                        break;
 143                case opt_decompose:
 144                        sbi->flags &= ~HFSPLUS_SB_NODECOMPOSE;
 145                        break;
 146                case opt_nodecompose:
 147                        sbi->flags |= HFSPLUS_SB_NODECOMPOSE;
 148                        break;
 149                case opt_force:
 150                        sbi->flags |= HFSPLUS_SB_FORCE;
 151                        break;
 152                default:
 153                        return 0;
 154                }
 155        }
 156
 157done:
 158        if (!sbi->nls) {
 159                /* try utf8 first, as this is the old default behaviour */
 160                sbi->nls = load_nls("utf8");
 161                if (!sbi->nls)
 162                        sbi->nls = load_nls_default();
 163                if (!sbi->nls)
 164                        return 0;
 165        }
 166
 167        return 1;
 168}
 169
 170int hfsplus_show_options(struct seq_file *seq, struct vfsmount *mnt)
 171{
 172        struct hfsplus_sb_info *sbi = &HFSPLUS_SB(mnt->mnt_sb);
 173
 174        if (sbi->creator != HFSPLUS_DEF_CR_TYPE)
 175                seq_printf(seq, ",creator=%.4s", (char *)&sbi->creator);
 176        if (sbi->type != HFSPLUS_DEF_CR_TYPE)
 177                seq_printf(seq, ",type=%.4s", (char *)&sbi->type);
 178        seq_printf(seq, ",umask=%o,uid=%u,gid=%u", sbi->umask, sbi->uid, sbi->gid);
 179        if (sbi->part >= 0)
 180                seq_printf(seq, ",part=%u", sbi->part);
 181        if (sbi->session >= 0)
 182                seq_printf(seq, ",session=%u", sbi->session);
 183        if (sbi->nls)
 184                seq_printf(seq, ",nls=%s", sbi->nls->charset);
 185        if (sbi->flags & HFSPLUS_SB_NODECOMPOSE)
 186                seq_printf(seq, ",nodecompose");
 187        return 0;
 188}
 189