mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-26 19:00:25 +00:00
239 lines
5.4 KiB
C
239 lines
5.4 KiB
C
/*
|
|
* 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 <linux/mount.h>
|
|
#include <linux/seq_file.h>
|
|
#include <linux/slab.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_barrier, opt_nobarrier,
|
|
opt_force, opt_err
|
|
};
|
|
|
|
static const 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_barrier, "barrier" },
|
|
{ opt_nobarrier, "nobarrier" },
|
|
{ opt_force, "force" },
|
|
{ opt_err, NULL }
|
|
};
|
|
|
|
/* Initialize an options object to reasonable defaults */
|
|
void hfsplus_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_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;
|
|
}
|
|
|
|
int hfsplus_parse_options_remount(char *input, int *force)
|
|
{
|
|
char *p;
|
|
substring_t args[MAX_OPT_ARGS];
|
|
int token;
|
|
|
|
if (!input)
|
|
return 0;
|
|
|
|
while ((p = strsep(&input, ",")) != NULL) {
|
|
if (!*p)
|
|
continue;
|
|
|
|
token = match_token(p, tokens, args);
|
|
switch (token) {
|
|
case opt_force:
|
|
*force = 1;
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
|
|
return 1;
|
|
}
|
|
|
|
/* Parse options from mount. Returns 0 on failure */
|
|
/* input is the options passed to mount() as a string */
|
|
int hfsplus_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(KERN_ERR "hfs: creator requires a 4 character value\n");
|
|
return 0;
|
|
}
|
|
break;
|
|
case opt_type:
|
|
if (match_fourchar(&args[0], &sbi->type)) {
|
|
printk(KERN_ERR "hfs: type requires a 4 character value\n");
|
|
return 0;
|
|
}
|
|
break;
|
|
case opt_umask:
|
|
if (match_octal(&args[0], &tmp)) {
|
|
printk(KERN_ERR "hfs: umask requires a value\n");
|
|
return 0;
|
|
}
|
|
sbi->umask = (umode_t)tmp;
|
|
break;
|
|
case opt_uid:
|
|
if (match_int(&args[0], &tmp)) {
|
|
printk(KERN_ERR "hfs: uid requires an argument\n");
|
|
return 0;
|
|
}
|
|
sbi->uid = make_kuid(current_user_ns(), (uid_t)tmp);
|
|
if (!uid_valid(sbi->uid)) {
|
|
printk(KERN_ERR "hfs: invalid uid specified\n");
|
|
return 0;
|
|
}
|
|
break;
|
|
case opt_gid:
|
|
if (match_int(&args[0], &tmp)) {
|
|
printk(KERN_ERR "hfs: gid requires an argument\n");
|
|
return 0;
|
|
}
|
|
sbi->gid = make_kgid(current_user_ns(), (gid_t)tmp);
|
|
if (!gid_valid(sbi->gid)) {
|
|
printk(KERN_ERR "hfs: invalid gid specified\n");
|
|
return 0;
|
|
}
|
|
break;
|
|
case opt_part:
|
|
if (match_int(&args[0], &sbi->part)) {
|
|
printk(KERN_ERR "hfs: part requires an argument\n");
|
|
return 0;
|
|
}
|
|
break;
|
|
case opt_session:
|
|
if (match_int(&args[0], &sbi->session)) {
|
|
printk(KERN_ERR "hfs: session requires an argument\n");
|
|
return 0;
|
|
}
|
|
break;
|
|
case opt_nls:
|
|
if (sbi->nls) {
|
|
printk(KERN_ERR "hfs: unable to change nls mapping\n");
|
|
return 0;
|
|
}
|
|
p = match_strdup(&args[0]);
|
|
if (p)
|
|
sbi->nls = load_nls(p);
|
|
if (!sbi->nls) {
|
|
printk(KERN_ERR "hfs: unable to load "
|
|
"nls mapping \"%s\"\n",
|
|
p);
|
|
kfree(p);
|
|
return 0;
|
|
}
|
|
kfree(p);
|
|
break;
|
|
case opt_decompose:
|
|
clear_bit(HFSPLUS_SB_NODECOMPOSE, &sbi->flags);
|
|
break;
|
|
case opt_nodecompose:
|
|
set_bit(HFSPLUS_SB_NODECOMPOSE, &sbi->flags);
|
|
break;
|
|
case opt_barrier:
|
|
clear_bit(HFSPLUS_SB_NOBARRIER, &sbi->flags);
|
|
break;
|
|
case opt_nobarrier:
|
|
set_bit(HFSPLUS_SB_NOBARRIER, &sbi->flags);
|
|
break;
|
|
case opt_force:
|
|
set_bit(HFSPLUS_SB_FORCE, &sbi->flags);
|
|
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;
|
|
}
|
|
|
|
int hfsplus_show_options(struct seq_file *seq, struct dentry *root)
|
|
{
|
|
struct hfsplus_sb_info *sbi = HFSPLUS_SB(root->d_sb);
|
|
|
|
if (sbi->creator != HFSPLUS_DEF_CR_TYPE)
|
|
seq_printf(seq, ",creator=%.4s", (char *)&sbi->creator);
|
|
if (sbi->type != HFSPLUS_DEF_CR_TYPE)
|
|
seq_printf(seq, ",type=%.4s", (char *)&sbi->type);
|
|
seq_printf(seq, ",umask=%o,uid=%u,gid=%u", sbi->umask,
|
|
from_kuid_munged(&init_user_ns, sbi->uid),
|
|
from_kgid_munged(&init_user_ns, sbi->gid));
|
|
if (sbi->part >= 0)
|
|
seq_printf(seq, ",part=%u", sbi->part);
|
|
if (sbi->session >= 0)
|
|
seq_printf(seq, ",session=%u", sbi->session);
|
|
if (sbi->nls)
|
|
seq_printf(seq, ",nls=%s", sbi->nls->charset);
|
|
if (test_bit(HFSPLUS_SB_NODECOMPOSE, &sbi->flags))
|
|
seq_printf(seq, ",nodecompose");
|
|
if (test_bit(HFSPLUS_SB_NOBARRIER, &sbi->flags))
|
|
seq_printf(seq, ",nobarrier");
|
|
return 0;
|
|
}
|