![Roman Zippel](/assets/img/avatar_default.png)
Access to a journaled HFS+ volume is not officially supported under Linux, so mount such a volume read-only, but users can override this behaviour using the "force" mount option. The minimum requirement to relax this check is to at least check that the journal is empty and so nothing needs to be replayed to make sure the volume is consistent. Signed-off-by: Roman Zippel <zippel@linux-m68k.org> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
189 lines
4.3 KiB
C
189 lines
4.3 KiB
C
/*
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* linux/fs/hfsplus/options.c
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*
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* Copyright (C) 2001
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* Brad Boyer (flar@allandria.com)
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* (C) 2003 Ardis Technologies <roman@ardistech.com>
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*
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* Option parsing
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*/
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#include <linux/string.h>
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#include <linux/kernel.h>
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#include <linux/sched.h>
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#include <linux/parser.h>
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#include <linux/nls.h>
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#include <linux/mount.h>
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#include <linux/seq_file.h>
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#include "hfsplus_fs.h"
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enum {
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opt_creator, opt_type,
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opt_umask, opt_uid, opt_gid,
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opt_part, opt_session, opt_nls,
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opt_nodecompose, opt_decompose,
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opt_force, opt_err
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};
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static match_table_t tokens = {
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{ opt_creator, "creator=%s" },
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{ opt_type, "type=%s" },
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{ opt_umask, "umask=%o" },
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{ opt_uid, "uid=%u" },
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{ opt_gid, "gid=%u" },
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{ opt_part, "part=%u" },
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{ opt_session, "session=%u" },
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{ opt_nls, "nls=%s" },
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{ opt_decompose, "decompose" },
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{ opt_nodecompose, "nodecompose" },
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{ opt_force, "force" },
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{ opt_err, NULL }
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};
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/* Initialize an options object to reasonable defaults */
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void hfsplus_fill_defaults(struct hfsplus_sb_info *opts)
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{
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if (!opts)
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return;
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opts->creator = HFSPLUS_DEF_CR_TYPE;
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opts->type = HFSPLUS_DEF_CR_TYPE;
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opts->umask = current->fs->umask;
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opts->uid = current->uid;
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opts->gid = current->gid;
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opts->part = -1;
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opts->session = -1;
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}
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/* convert a "four byte character" to a 32 bit int with error checks */
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static inline int match_fourchar(substring_t *arg, u32 *result)
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{
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if (arg->to - arg->from != 4)
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return -EINVAL;
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memcpy(result, arg->from, 4);
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return 0;
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}
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/* Parse options from mount. Returns 0 on failure */
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/* input is the options passed to mount() as a string */
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int hfsplus_parse_options(char *input, struct hfsplus_sb_info *sbi)
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{
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char *p;
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substring_t args[MAX_OPT_ARGS];
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int tmp, token;
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if (!input)
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goto done;
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while ((p = strsep(&input, ",")) != NULL) {
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if (!*p)
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continue;
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token = match_token(p, tokens, args);
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switch (token) {
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case opt_creator:
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if (match_fourchar(&args[0], &sbi->creator)) {
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printk("HFS+-fs: creator requires a 4 character value\n");
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return 0;
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}
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break;
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case opt_type:
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if (match_fourchar(&args[0], &sbi->type)) {
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printk("HFS+-fs: type requires a 4 character value\n");
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return 0;
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}
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break;
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case opt_umask:
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if (match_octal(&args[0], &tmp)) {
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printk("HFS+-fs: umask requires a value\n");
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return 0;
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}
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sbi->umask = (umode_t)tmp;
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break;
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case opt_uid:
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if (match_int(&args[0], &tmp)) {
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printk("HFS+-fs: uid requires an argument\n");
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return 0;
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}
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sbi->uid = (uid_t)tmp;
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break;
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case opt_gid:
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if (match_int(&args[0], &tmp)) {
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printk("HFS+-fs: gid requires an argument\n");
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return 0;
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}
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sbi->gid = (gid_t)tmp;
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break;
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case opt_part:
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if (match_int(&args[0], &sbi->part)) {
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printk("HFS+-fs: part requires an argument\n");
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return 0;
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}
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break;
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case opt_session:
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if (match_int(&args[0], &sbi->session)) {
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printk("HFS+-fs: session requires an argument\n");
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return 0;
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}
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break;
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case opt_nls:
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if (sbi->nls) {
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printk("HFS+-fs: unable to change nls mapping\n");
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return 0;
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}
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p = match_strdup(&args[0]);
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sbi->nls = load_nls(p);
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if (!sbi->nls) {
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printk("HFS+-fs: unable to load nls mapping \"%s\"\n", p);
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kfree(p);
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return 0;
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}
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kfree(p);
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break;
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case opt_decompose:
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sbi->flags &= ~HFSPLUS_SB_NODECOMPOSE;
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break;
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case opt_nodecompose:
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sbi->flags |= HFSPLUS_SB_NODECOMPOSE;
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break;
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case opt_force:
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sbi->flags |= HFSPLUS_SB_FORCE;
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break;
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default:
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return 0;
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}
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}
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done:
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if (!sbi->nls) {
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/* try utf8 first, as this is the old default behaviour */
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sbi->nls = load_nls("utf8");
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if (!sbi->nls)
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sbi->nls = load_nls_default();
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if (!sbi->nls)
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return 0;
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}
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return 1;
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}
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int hfsplus_show_options(struct seq_file *seq, struct vfsmount *mnt)
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{
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struct hfsplus_sb_info *sbi = &HFSPLUS_SB(mnt->mnt_sb);
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if (sbi->creator != HFSPLUS_DEF_CR_TYPE)
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seq_printf(seq, ",creator=%.4s", (char *)&sbi->creator);
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if (sbi->type != HFSPLUS_DEF_CR_TYPE)
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seq_printf(seq, ",type=%.4s", (char *)&sbi->type);
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seq_printf(seq, ",umask=%o,uid=%u,gid=%u", sbi->umask, sbi->uid, sbi->gid);
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if (sbi->part >= 0)
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seq_printf(seq, ",part=%u", sbi->part);
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if (sbi->session >= 0)
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seq_printf(seq, ",session=%u", sbi->session);
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if (sbi->nls)
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seq_printf(seq, ",nls=%s", sbi->nls->charset);
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if (sbi->flags & HFSPLUS_SB_NODECOMPOSE)
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seq_printf(seq, ",nodecompose");
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return 0;
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}
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