[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 "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 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->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 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("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;
}

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