[mirror_ubuntu-artful-kernel.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_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 1;

	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)) {
				pr_err("creator requires a 4 character value\n");
				return 0;
			}
			break;
		case opt_type:
			if (match_fourchar(&args[0], &sbi->type)) {
				pr_err("type requires a 4 character value\n");
				return 0;
			}
			break;
		case opt_umask:
			if (match_octal(&args[0], &tmp)) {
				pr_err("umask requires a value\n");
				return 0;
			}
			sbi->umask = (umode_t)tmp;
			break;
		case opt_uid:
			if (match_int(&args[0], &tmp)) {
				pr_err("uid requires an argument\n");
				return 0;
			}
			sbi->uid = make_kuid(current_user_ns(), (uid_t)tmp);
			if (!uid_valid(sbi->uid)) {
				pr_err("invalid uid specified\n");
				return 0;
			}
			break;
		case opt_gid:
			if (match_int(&args[0], &tmp)) {
				pr_err("gid requires an argument\n");
				return 0;
			}
			sbi->gid = make_kgid(current_user_ns(), (gid_t)tmp);
			if (!gid_valid(sbi->gid)) {
				pr_err("invalid gid specified\n");
				return 0;
			}
			break;
		case opt_part:
			if (match_int(&args[0], &sbi->part)) {
				pr_err("part requires an argument\n");
				return 0;
			}
			break;
		case opt_session:
			if (match_int(&args[0], &sbi->session)) {
				pr_err("session requires an argument\n");
				return 0;
			}
			break;
		case opt_nls:
			if (sbi->nls) {
				pr_err("unable to change nls mapping\n");
				return 0;
			}
			p = match_strdup(&args[0]);
			if (p)
				sbi->nls = load_nls(p);
			if (!sbi->nls) {
				pr_err("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_show_option_n(seq, "creator", (char *)&sbi->creator, 4);
	if (sbi->type != HFSPLUS_DEF_CR_TYPE)
		seq_show_option_n(seq, "type", (char *)&sbi->type, 4);
	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_puts(seq, ",nodecompose");
	if (test_bit(HFSPLUS_SB_NOBARRIER, &sbi->flags))
		seq_puts(seq, ",nobarrier");
	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,
34a2d313	26	opt_barrier, opt_nobarrier,
b0b623c3	27	opt_force, opt_err
1da177e4 LT	28	};
1da177e4 LT	29
a447c093	30	static const match_table_t tokens = {
1da177e4 LT	31	{ opt_creator, "creator=%s" },
	32	{ opt_type, "type=%s" },
	33	{ opt_umask, "umask=%o" },
	34	{ opt_uid, "uid=%u" },
	35	{ opt_gid, "gid=%u" },
	36	{ opt_part, "part=%u" },
	37	{ opt_session, "session=%u" },
	38	{ opt_nls, "nls=%s" },
	39	{ opt_decompose, "decompose" },
	40	{ opt_nodecompose, "nodecompose" },
34a2d313 CH	41	{ opt_barrier, "barrier" },
34a2d313 CH	42	{ opt_nobarrier, "nobarrier" },
b0b623c3	43	{ opt_force, "force" },
1da177e4 LT	44	{ opt_err, NULL }
	45	};
	46
	47	/* Initialize an options object to reasonable defaults */
717dd80e	48	void hfsplus_fill_defaults(struct hfsplus_sb_info *opts)
1da177e4 LT	49	{
	50	if (!opts)
	51	return;
	52
	53	opts->creator = HFSPLUS_DEF_CR_TYPE;
	54	opts->type = HFSPLUS_DEF_CR_TYPE;
ce3b0f8d	55	opts->umask = current_umask();
4ac8489a DH	56	opts->uid = current_uid();
4ac8489a DH	57	opts->gid = current_gid();
1da177e4 LT	58	opts->part = -1;
	59	opts->session = -1;
	60	}
	61
	62	/* convert a "four byte character" to a 32 bit int with error checks */
	63	static inline int match_fourchar(substring_t arg, u32 result)
	64	{
	65	if (arg->to - arg->from != 4)
	66	return -EINVAL;
	67	memcpy(result, arg->from, 4);
	68	return 0;
	69	}
	70
6f80dfe5 CH	71	int hfsplus_parse_options_remount(char input, int force)
	72	{
	73	char *p;
	74	substring_t args[MAX_OPT_ARGS];
	75	int token;
	76
	77	if (!input)
bd2c0035	78	return 1;
6f80dfe5 CH	79
	80	while ((p = strsep(&input, ",")) != NULL) {
	81	if (!*p)
	82	continue;
	83
	84	token = match_token(p, tokens, args);
	85	switch (token) {
	86	case opt_force:
	87	*force = 1;
	88	break;
	89	default:
	90	break;
	91	}
	92	}
	93
	94	return 1;
	95	}
	96
1da177e4 LT	97	/* Parse options from mount. Returns 0 on failure */
1da177e4 LT	98	/* input is the options passed to mount() as a string */
717dd80e	99	int hfsplus_parse_options(char input, struct hfsplus_sb_info sbi)
1da177e4 LT	100	{
	101	char *p;
	102	substring_t args[MAX_OPT_ARGS];
	103	int tmp, token;
	104
	105	if (!input)
	106	goto done;
	107
	108	while ((p = strsep(&input, ",")) != NULL) {
	109	if (!*p)
	110	continue;
	111
	112	token = match_token(p, tokens, args);
	113	switch (token) {
	114	case opt_creator:
	115	if (match_fourchar(&args[0], &sbi->creator)) {
d6142673	116	pr_err("creator requires a 4 character value\n");
1da177e4 LT	117	return 0;
	118	}
	119	break;
	120	case opt_type:
	121	if (match_fourchar(&args[0], &sbi->type)) {
d6142673	122	pr_err("type requires a 4 character value\n");
1da177e4 LT	123	return 0;
	124	}
	125	break;
	126	case opt_umask:
	127	if (match_octal(&args[0], &tmp)) {
d6142673	128	pr_err("umask requires a value\n");
1da177e4 LT	129	return 0;
	130	}
	131	sbi->umask = (umode_t)tmp;
	132	break;
	133	case opt_uid:
	134	if (match_int(&args[0], &tmp)) {
d6142673	135	pr_err("uid requires an argument\n");
1da177e4 LT	136	return 0;
1da177e4 LT	137	}
16525e3f EB	138	sbi->uid = make_kuid(current_user_ns(), (uid_t)tmp);
16525e3f EB	139	if (!uid_valid(sbi->uid)) {
d6142673	140	pr_err("invalid uid specified\n");
16525e3f EB	141	return 0;
16525e3f EB	142	}
1da177e4 LT	143	break;
	144	case opt_gid:
	145	if (match_int(&args[0], &tmp)) {
d6142673	146	pr_err("gid requires an argument\n");
1da177e4 LT	147	return 0;
1da177e4 LT	148	}
16525e3f EB	149	sbi->gid = make_kgid(current_user_ns(), (gid_t)tmp);
16525e3f EB	150	if (!gid_valid(sbi->gid)) {
d6142673	151	pr_err("invalid gid specified\n");
16525e3f EB	152	return 0;
16525e3f EB	153	}
1da177e4 LT	154	break;
	155	case opt_part:
	156	if (match_int(&args[0], &sbi->part)) {
d6142673	157	pr_err("part requires an argument\n");
1da177e4 LT	158	return 0;
	159	}
	160	break;
	161	case opt_session:
	162	if (match_int(&args[0], &sbi->session)) {
d6142673	163	pr_err("session requires an argument\n");
1da177e4 LT	164	return 0;
	165	}
	166	break;
	167	case opt_nls:
	168	if (sbi->nls) {
d6142673	169	pr_err("unable to change nls mapping\n");
1da177e4 LT	170	return 0;
	171	}
	172	p = match_strdup(&args[0]);
cd6fda36 JM	173	if (p)
cd6fda36 JM	174	sbi->nls = load_nls(p);
1da177e4	175	if (!sbi->nls) {
d8983ca0 FF	176	pr_err("unable to load nls mapping \"%s\"\n",
d8983ca0 FF	177	p);
1da177e4 LT	178	kfree(p);
	179	return 0;
	180	}
	181	kfree(p);
	182	break;
	183	case opt_decompose:
84adede3	184	clear_bit(HFSPLUS_SB_NODECOMPOSE, &sbi->flags);
1da177e4 LT	185	break;
1da177e4 LT	186	case opt_nodecompose:
84adede3	187	set_bit(HFSPLUS_SB_NODECOMPOSE, &sbi->flags);
1da177e4	188	break;
34a2d313 CH	189	case opt_barrier:
	190	clear_bit(HFSPLUS_SB_NOBARRIER, &sbi->flags);
	191	break;
	192	case opt_nobarrier:
	193	set_bit(HFSPLUS_SB_NOBARRIER, &sbi->flags);
	194	break;
b0b623c3	195	case opt_force:
84adede3	196	set_bit(HFSPLUS_SB_FORCE, &sbi->flags);
b0b623c3	197	break;
1da177e4 LT	198	default:
	199	return 0;
	200	}
	201	}
	202
	203	done:
	204	if (!sbi->nls) {
	205	/* try utf8 first, as this is the old default behaviour */
	206	sbi->nls = load_nls("utf8");
	207	if (!sbi->nls)
	208	sbi->nls = load_nls_default();
	209	if (!sbi->nls)
	210	return 0;
	211	}
	212
	213	return 1;
	214	}
717dd80e	215
34c80b1d	216	int hfsplus_show_options(struct seq_file seq, struct dentry root)
717dd80e	217	{
34c80b1d	218	struct hfsplus_sb_info *sbi = HFSPLUS_SB(root->d_sb);
717dd80e RZ	219
717dd80e RZ	220	if (sbi->creator != HFSPLUS_DEF_CR_TYPE)
a068acf2	221	seq_show_option_n(seq, "creator", (char *)&sbi->creator, 4);
717dd80e	222	if (sbi->type != HFSPLUS_DEF_CR_TYPE)
a068acf2	223	seq_show_option_n(seq, "type", (char *)&sbi->type, 4);
2753cc28	224	seq_printf(seq, ",umask=%o,uid=%u,gid=%u", sbi->umask,
16525e3f EB	225	from_kuid_munged(&init_user_ns, sbi->uid),
16525e3f EB	226	from_kgid_munged(&init_user_ns, sbi->gid));
717dd80e RZ	227	if (sbi->part >= 0)
	228	seq_printf(seq, ",part=%u", sbi->part);
	229	if (sbi->session >= 0)
	230	seq_printf(seq, ",session=%u", sbi->session);
	231	if (sbi->nls)
	232	seq_printf(seq, ",nls=%s", sbi->nls->charset);
84adede3	233	if (test_bit(HFSPLUS_SB_NODECOMPOSE, &sbi->flags))
d8983ca0	234	seq_puts(seq, ",nodecompose");
34a2d313	235	if (test_bit(HFSPLUS_SB_NOBARRIER, &sbi->flags))
d8983ca0	236	seq_puts(seq, ",nobarrier");
717dd80e RZ	237	return 0;
717dd80e RZ	238	}