/* * linux/fs/hfsplus/options.c * * Copyright (C) 2001 * Brad Boyer (flar@allandria.com) * (C) 2003 Ardis Technologies <roman@ardistech.com> * * Option parsing */ #include <linux/string.h> #include <linux/kernel.h> #include <linux/sched.h> #include <linux/parser.h> #include <linux/nls.h> #include "hfsplus_fs.h" enum { opt_creator, opt_type, opt_umask, opt_uid, opt_gid, opt_part, opt_session, opt_nls, opt_nodecompose, opt_decompose, opt_err }; static match_table_t tokens = { { opt_creator, "creator=%s" }, { opt_type, "type=%s" }, { opt_umask, "umask=%o" }, { opt_uid, "uid=%u" }, { opt_gid, "gid=%u" }, { opt_part, "part=%u" }, { opt_session, "session=%u" }, { opt_nls, "nls=%s" }, { opt_decompose, "decompose" }, { opt_nodecompose, "nodecompose" }, { opt_err, NULL } }; /* Initialize an options object to reasonable defaults */ void fill_defaults(struct hfsplus_sb_info *opts) { if (!opts) return; opts->creator = HFSPLUS_DEF_CR_TYPE; opts->type = HFSPLUS_DEF_CR_TYPE; opts->umask = current->fs->umask; opts->uid = current->uid; opts->gid = current->gid; opts->part = -1; opts->session = -1; } /* convert a "four byte character" to a 32 bit int with error checks */ static inline int match_fourchar(substring_t *arg, u32 *result) { if (arg->to - arg->from != 4) return -EINVAL; memcpy(result, arg->from, 4); return 0; } /* Parse options from mount. Returns 0 on failure */ /* input is the options passed to mount() as a string */ int parse_options(char *input, struct hfsplus_sb_info *sbi) { char *p; substring_t args[MAX_OPT_ARGS]; int tmp, token; if (!input) goto done; while ((p = strsep(&input, ",")) != NULL) { if (!*p) continue; token = match_token(p, tokens, args); switch (token) { case opt_creator: if (match_fourchar(&args[0], &sbi->creator)) { printk("HFS+-fs: creator requires a 4 character value\n"); return 0; } break; case opt_type: if (match_fourchar(&args[0], &sbi->type)) { printk("HFS+-fs: type requires a 4 character value\n"); return 0; } break; case opt_umask: if (match_octal(&args[0], &tmp)) { printk("HFS+-fs: umask requires a value\n"); return 0; } sbi->umask = (umode_t)tmp; break; case opt_uid: if (match_int(&args[0], &tmp)) { printk("HFS+-fs: uid requires an argument\n"); return 0; } sbi->uid = (uid_t)tmp; break; case opt_gid: if (match_int(&args[0], &tmp)) { printk("HFS+-fs: gid requires an argument\n"); return 0; } sbi->gid = (gid_t)tmp; break; case opt_part: if (match_int(&args[0], &sbi->part)) { printk("HFS+-fs: part requires an argument\n"); return 0; } break; case opt_session: if (match_int(&args[0], &sbi->session)) { printk("HFS+-fs: session requires an argument\n"); return 0; } break; case opt_nls: if (sbi->nls) { printk("HFS+-fs: unable to change nls mapping\n"); return 0; } p = match_strdup(&args[0]); sbi->nls = load_nls(p); if (!sbi->nls) { printk("HFS+-fs: unable to load nls mapping \"%s\"\n", p); kfree(p); return 0; } kfree(p); break; case opt_decompose: sbi->flags &= ~HFSPLUS_SB_NODECOMPOSE; break; case opt_nodecompose: sbi->flags |= HFSPLUS_SB_NODECOMPOSE; break; default: return 0; } } done: if (!sbi->nls) { /* try utf8 first, as this is the old default behaviour */ sbi->nls = load_nls("utf8"); if (!sbi->nls) sbi->nls = load_nls_default(); if (!sbi->nls) return 0; } return 1; }