[net-next-2.6.git] / fs / hfsplus / options.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_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_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;
}

/* 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 = (uid_t)tmp;
			break;
		case opt_gid:
			if (match_int(&args[0], &tmp)) {
				printk(KERN_ERR "hfs: gid requires an argument\n");
				return 0;
			}
			sbi->gid = (gid_t)tmp;
			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_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 vfsmount *mnt)
{
	struct hfsplus_sb_info *sbi = HFSPLUS_SB(mnt->mnt_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, sbi->uid, 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");
	return 0;
}
Commit	Line	Data
1da177e4 LT	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>
717dd80e RZ	16	#include <linux/mount.h>
717dd80e RZ	17	#include <linux/seq_file.h>
5a0e3ad6	18	#include <linux/slab.h>
1da177e4 LT	19	#include "hfsplus_fs.h"
	20
	21	enum {
	22	opt_creator, opt_type,
	23	opt_umask, opt_uid, opt_gid,
	24	opt_part, opt_session, opt_nls,
	25	opt_nodecompose, opt_decompose,
b0b623c3	26	opt_force, opt_err
1da177e4 LT	27	};
1da177e4 LT	28
a447c093	29	static const match_table_t tokens = {
1da177e4 LT	30	{ opt_creator, "creator=%s" },
	31	{ opt_type, "type=%s" },
	32	{ opt_umask, "umask=%o" },
	33	{ opt_uid, "uid=%u" },
	34	{ opt_gid, "gid=%u" },
	35	{ opt_part, "part=%u" },
	36	{ opt_session, "session=%u" },
	37	{ opt_nls, "nls=%s" },
	38	{ opt_decompose, "decompose" },
	39	{ opt_nodecompose, "nodecompose" },
b0b623c3	40	{ opt_force, "force" },
1da177e4 LT	41	{ opt_err, NULL }
	42	};
	43
	44	/* Initialize an options object to reasonable defaults */
717dd80e	45	void hfsplus_fill_defaults(struct hfsplus_sb_info *opts)
1da177e4 LT	46	{
	47	if (!opts)
	48	return;
	49
	50	opts->creator = HFSPLUS_DEF_CR_TYPE;
	51	opts->type = HFSPLUS_DEF_CR_TYPE;
ce3b0f8d	52	opts->umask = current_umask();
4ac8489a DH	53	opts->uid = current_uid();
4ac8489a DH	54	opts->gid = current_gid();
1da177e4 LT	55	opts->part = -1;
	56	opts->session = -1;
	57	}
	58
	59	/* convert a "four byte character" to a 32 bit int with error checks */
	60	static inline int match_fourchar(substring_t arg, u32 result)
	61	{
	62	if (arg->to - arg->from != 4)
	63	return -EINVAL;
	64	memcpy(result, arg->from, 4);
	65	return 0;
	66	}
	67
	68	/* Parse options from mount. Returns 0 on failure */
	69	/* input is the options passed to mount() as a string */
717dd80e	70	int hfsplus_parse_options(char input, struct hfsplus_sb_info sbi)
1da177e4 LT	71	{
	72	char *p;
	73	substring_t args[MAX_OPT_ARGS];
	74	int tmp, token;
	75
	76	if (!input)
	77	goto done;
	78
	79	while ((p = strsep(&input, ",")) != NULL) {
	80	if (!*p)
	81	continue;
	82
	83	token = match_token(p, tokens, args);
	84	switch (token) {
	85	case opt_creator:
	86	if (match_fourchar(&args[0], &sbi->creator)) {
634725a9	87	printk(KERN_ERR "hfs: creator requires a 4 character value\n");
1da177e4 LT	88	return 0;
	89	}
	90	break;
	91	case opt_type:
	92	if (match_fourchar(&args[0], &sbi->type)) {
634725a9	93	printk(KERN_ERR "hfs: type requires a 4 character value\n");
1da177e4 LT	94	return 0;
	95	}
	96	break;
	97	case opt_umask:
	98	if (match_octal(&args[0], &tmp)) {
634725a9	99	printk(KERN_ERR "hfs: umask requires a value\n");
1da177e4 LT	100	return 0;
	101	}
	102	sbi->umask = (umode_t)tmp;
	103	break;
	104	case opt_uid:
	105	if (match_int(&args[0], &tmp)) {
634725a9	106	printk(KERN_ERR "hfs: uid requires an argument\n");
1da177e4 LT	107	return 0;
	108	}
	109	sbi->uid = (uid_t)tmp;
	110	break;
	111	case opt_gid:
	112	if (match_int(&args[0], &tmp)) {
634725a9	113	printk(KERN_ERR "hfs: gid requires an argument\n");
1da177e4 LT	114	return 0;
	115	}
	116	sbi->gid = (gid_t)tmp;
	117	break;
	118	case opt_part:
	119	if (match_int(&args[0], &sbi->part)) {
634725a9	120	printk(KERN_ERR "hfs: part requires an argument\n");
1da177e4 LT	121	return 0;
	122	}
	123	break;
	124	case opt_session:
	125	if (match_int(&args[0], &sbi->session)) {
634725a9	126	printk(KERN_ERR "hfs: session requires an argument\n");
1da177e4 LT	127	return 0;
	128	}
	129	break;
	130	case opt_nls:
	131	if (sbi->nls) {
634725a9	132	printk(KERN_ERR "hfs: unable to change nls mapping\n");
1da177e4 LT	133	return 0;
	134	}
	135	p = match_strdup(&args[0]);
cd6fda36 JM	136	if (p)
cd6fda36 JM	137	sbi->nls = load_nls(p);
1da177e4	138	if (!sbi->nls) {
634725a9	139	printk(KERN_ERR "hfs: unable to load nls mapping \"%s\"\n", p);
1da177e4 LT	140	kfree(p);
	141	return 0;
	142	}
	143	kfree(p);
	144	break;
	145	case opt_decompose:
84adede3	146	clear_bit(HFSPLUS_SB_NODECOMPOSE, &sbi->flags);
1da177e4 LT	147	break;
1da177e4 LT	148	case opt_nodecompose:
84adede3	149	set_bit(HFSPLUS_SB_NODECOMPOSE, &sbi->flags);
1da177e4	150	break;
b0b623c3	151	case opt_force:
84adede3	152	set_bit(HFSPLUS_SB_FORCE, &sbi->flags);
b0b623c3	153	break;
1da177e4 LT	154	default:
	155	return 0;
	156	}
	157	}
	158
	159	done:
	160	if (!sbi->nls) {
	161	/* try utf8 first, as this is the old default behaviour */
	162	sbi->nls = load_nls("utf8");
	163	if (!sbi->nls)
	164	sbi->nls = load_nls_default();
	165	if (!sbi->nls)
	166	return 0;
	167	}
	168
	169	return 1;
	170	}
717dd80e RZ	171
	172	int hfsplus_show_options(struct seq_file seq, struct vfsmount mnt)
	173	{
dd73a01a	174	struct hfsplus_sb_info *sbi = HFSPLUS_SB(mnt->mnt_sb);
717dd80e RZ	175
	176	if (sbi->creator != HFSPLUS_DEF_CR_TYPE)
	177	seq_printf(seq, ",creator=%.4s", (char *)&sbi->creator);
	178	if (sbi->type != HFSPLUS_DEF_CR_TYPE)
	179	seq_printf(seq, ",type=%.4s", (char *)&sbi->type);
	180	seq_printf(seq, ",umask=%o,uid=%u,gid=%u", sbi->umask, sbi->uid, sbi->gid);
	181	if (sbi->part >= 0)
	182	seq_printf(seq, ",part=%u", sbi->part);
	183	if (sbi->session >= 0)
	184	seq_printf(seq, ",session=%u", sbi->session);
	185	if (sbi->nls)
	186	seq_printf(seq, ",nls=%s", sbi->nls->charset);
84adede3	187	if (test_bit(HFSPLUS_SB_NODECOMPOSE, &sbi->flags))
717dd80e RZ	188	seq_printf(seq, ",nodecompose");
	189	return 0;
	190	}