[deliverable/linux.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;
}

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 = (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
6f80dfe5 CH	68	int hfsplus_parse_options_remount(char input, int force)
	69	{
	70	char *p;
	71	substring_t args[MAX_OPT_ARGS];
	72	int token;
	73
	74	if (!input)
	75	return 0;
	76
	77	while ((p = strsep(&input, ",")) != NULL) {
	78	if (!*p)
	79	continue;
	80
	81	token = match_token(p, tokens, args);
	82	switch (token) {
	83	case opt_force:
	84	*force = 1;
	85	break;
	86	default:
	87	break;
	88	}
	89	}
	90
	91	return 1;
	92	}
	93
1da177e4 LT	94	/* Parse options from mount. Returns 0 on failure */
1da177e4 LT	95	/* input is the options passed to mount() as a string */
717dd80e	96	int hfsplus_parse_options(char input, struct hfsplus_sb_info sbi)
1da177e4 LT	97	{
	98	char *p;
	99	substring_t args[MAX_OPT_ARGS];
	100	int tmp, token;
	101
	102	if (!input)
	103	goto done;
	104
	105	while ((p = strsep(&input, ",")) != NULL) {
	106	if (!*p)
	107	continue;
	108
	109	token = match_token(p, tokens, args);
	110	switch (token) {
	111	case opt_creator:
	112	if (match_fourchar(&args[0], &sbi->creator)) {
634725a9	113	printk(KERN_ERR "hfs: creator requires a 4 character value\n");
1da177e4 LT	114	return 0;
	115	}
	116	break;
	117	case opt_type:
	118	if (match_fourchar(&args[0], &sbi->type)) {
634725a9	119	printk(KERN_ERR "hfs: type requires a 4 character value\n");
1da177e4 LT	120	return 0;
	121	}
	122	break;
	123	case opt_umask:
	124	if (match_octal(&args[0], &tmp)) {
634725a9	125	printk(KERN_ERR "hfs: umask requires a value\n");
1da177e4 LT	126	return 0;
	127	}
	128	sbi->umask = (umode_t)tmp;
	129	break;
	130	case opt_uid:
	131	if (match_int(&args[0], &tmp)) {
634725a9	132	printk(KERN_ERR "hfs: uid requires an argument\n");
1da177e4 LT	133	return 0;
	134	}
	135	sbi->uid = (uid_t)tmp;
	136	break;
	137	case opt_gid:
	138	if (match_int(&args[0], &tmp)) {
634725a9	139	printk(KERN_ERR "hfs: gid requires an argument\n");
1da177e4 LT	140	return 0;
	141	}
	142	sbi->gid = (gid_t)tmp;
	143	break;
	144	case opt_part:
	145	if (match_int(&args[0], &sbi->part)) {
634725a9	146	printk(KERN_ERR "hfs: part requires an argument\n");
1da177e4 LT	147	return 0;
	148	}
	149	break;
	150	case opt_session:
	151	if (match_int(&args[0], &sbi->session)) {
634725a9	152	printk(KERN_ERR "hfs: session requires an argument\n");
1da177e4 LT	153	return 0;
	154	}
	155	break;
	156	case opt_nls:
	157	if (sbi->nls) {
634725a9	158	printk(KERN_ERR "hfs: unable to change nls mapping\n");
1da177e4 LT	159	return 0;
	160	}
	161	p = match_strdup(&args[0]);
cd6fda36 JM	162	if (p)
cd6fda36 JM	163	sbi->nls = load_nls(p);
1da177e4	164	if (!sbi->nls) {
634725a9	165	printk(KERN_ERR "hfs: unable to load nls mapping \"%s\"\n", p);
1da177e4 LT	166	kfree(p);
	167	return 0;
	168	}
	169	kfree(p);
	170	break;
	171	case opt_decompose:
84adede3	172	clear_bit(HFSPLUS_SB_NODECOMPOSE, &sbi->flags);
1da177e4 LT	173	break;
1da177e4 LT	174	case opt_nodecompose:
84adede3	175	set_bit(HFSPLUS_SB_NODECOMPOSE, &sbi->flags);
1da177e4	176	break;
b0b623c3	177	case opt_force:
84adede3	178	set_bit(HFSPLUS_SB_FORCE, &sbi->flags);
b0b623c3	179	break;
1da177e4 LT	180	default:
	181	return 0;
	182	}
	183	}
	184
	185	done:
	186	if (!sbi->nls) {
	187	/* try utf8 first, as this is the old default behaviour */
	188	sbi->nls = load_nls("utf8");
	189	if (!sbi->nls)
	190	sbi->nls = load_nls_default();
	191	if (!sbi->nls)
	192	return 0;
	193	}
	194
	195	return 1;
	196	}
717dd80e RZ	197
	198	int hfsplus_show_options(struct seq_file seq, struct vfsmount mnt)
	199	{
dd73a01a	200	struct hfsplus_sb_info *sbi = HFSPLUS_SB(mnt->mnt_sb);
717dd80e RZ	201
	202	if (sbi->creator != HFSPLUS_DEF_CR_TYPE)
	203	seq_printf(seq, ",creator=%.4s", (char *)&sbi->creator);
	204	if (sbi->type != HFSPLUS_DEF_CR_TYPE)
	205	seq_printf(seq, ",type=%.4s", (char *)&sbi->type);
	206	seq_printf(seq, ",umask=%o,uid=%u,gid=%u", sbi->umask, sbi->uid, sbi->gid);
	207	if (sbi->part >= 0)
	208	seq_printf(seq, ",part=%u", sbi->part);
	209	if (sbi->session >= 0)
	210	seq_printf(seq, ",session=%u", sbi->session);
	211	if (sbi->nls)
	212	seq_printf(seq, ",nls=%s", sbi->nls->charset);
84adede3	213	if (test_bit(HFSPLUS_SB_NODECOMPOSE, &sbi->flags))
717dd80e RZ	214	seq_printf(seq, ",nodecompose");
	215	return 0;
	216	}