[linux.git] / fs / hfsplus / options.c

// SPDX-License-Identifier: GPL-2.0
/*
 *  linux/fs/hfsplus/options.c
 *
 * Copyright (C) 2001
 * Brad Boyer ([email protected])
 * (C) 2003 Ardis Technologies <[email protected]>
 *
 * 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
b2441318	1	// SPDX-License-Identifier: GPL-2.0
1da177e4 LT	2	/*
	3	* linux/fs/hfsplus/options.c
	4	*
	5	* Copyright (C) 2001
	6	* Brad Boyer ([email protected])
	7	* (C) 2003 Ardis Technologies <[email protected]>
	8	*
	9	* Option parsing
	10	*/
	11
	12	#include <linux/string.h>
	13	#include <linux/kernel.h>
	14	#include <linux/sched.h>
	15	#include <linux/parser.h>
	16	#include <linux/nls.h>
717dd80e RZ	17	#include <linux/mount.h>
717dd80e RZ	18	#include <linux/seq_file.h>
5a0e3ad6	19	#include <linux/slab.h>
1da177e4 LT	20	#include "hfsplus_fs.h"
	21
	22	enum {
	23	opt_creator, opt_type,
	24	opt_umask, opt_uid, opt_gid,
	25	opt_part, opt_session, opt_nls,
	26	opt_nodecompose, opt_decompose,
34a2d313	27	opt_barrier, opt_nobarrier,
b0b623c3	28	opt_force, opt_err
1da177e4 LT	29	};
1da177e4 LT	30
a447c093	31	static const match_table_t tokens = {
1da177e4 LT	32	{ opt_creator, "creator=%s" },
	33	{ opt_type, "type=%s" },
	34	{ opt_umask, "umask=%o" },
	35	{ opt_uid, "uid=%u" },
	36	{ opt_gid, "gid=%u" },
	37	{ opt_part, "part=%u" },
	38	{ opt_session, "session=%u" },
	39	{ opt_nls, "nls=%s" },
	40	{ opt_decompose, "decompose" },
	41	{ opt_nodecompose, "nodecompose" },
34a2d313 CH	42	{ opt_barrier, "barrier" },
34a2d313 CH	43	{ opt_nobarrier, "nobarrier" },
b0b623c3	44	{ opt_force, "force" },
1da177e4 LT	45	{ opt_err, NULL }
	46	};
	47
	48	/* Initialize an options object to reasonable defaults */
717dd80e	49	void hfsplus_fill_defaults(struct hfsplus_sb_info *opts)
1da177e4 LT	50	{
	51	if (!opts)
	52	return;
	53
	54	opts->creator = HFSPLUS_DEF_CR_TYPE;
	55	opts->type = HFSPLUS_DEF_CR_TYPE;
ce3b0f8d	56	opts->umask = current_umask();
4ac8489a DH	57	opts->uid = current_uid();
4ac8489a DH	58	opts->gid = current_gid();
1da177e4 LT	59	opts->part = -1;
	60	opts->session = -1;
	61	}
	62
	63	/* convert a "four byte character" to a 32 bit int with error checks */
	64	static inline int match_fourchar(substring_t arg, u32 result)
	65	{
	66	if (arg->to - arg->from != 4)
	67	return -EINVAL;
	68	memcpy(result, arg->from, 4);
	69	return 0;
	70	}
	71
6f80dfe5 CH	72	int hfsplus_parse_options_remount(char input, int force)
	73	{
	74	char *p;
	75	substring_t args[MAX_OPT_ARGS];
	76	int token;
	77
	78	if (!input)
bd2c0035	79	return 1;
6f80dfe5 CH	80
	81	while ((p = strsep(&input, ",")) != NULL) {
	82	if (!*p)
	83	continue;
	84
	85	token = match_token(p, tokens, args);
	86	switch (token) {
	87	case opt_force:
	88	*force = 1;
	89	break;
	90	default:
	91	break;
	92	}
	93	}
	94
	95	return 1;
	96	}
	97
1da177e4 LT	98	/* Parse options from mount. Returns 0 on failure */
1da177e4 LT	99	/* input is the options passed to mount() as a string */
717dd80e	100	int hfsplus_parse_options(char input, struct hfsplus_sb_info sbi)
1da177e4 LT	101	{
	102	char *p;
	103	substring_t args[MAX_OPT_ARGS];
	104	int tmp, token;
	105
	106	if (!input)
	107	goto done;
	108
	109	while ((p = strsep(&input, ",")) != NULL) {
	110	if (!*p)
	111	continue;
	112
	113	token = match_token(p, tokens, args);
	114	switch (token) {
	115	case opt_creator:
	116	if (match_fourchar(&args[0], &sbi->creator)) {
d6142673	117	pr_err("creator requires a 4 character value\n");
1da177e4 LT	118	return 0;
	119	}
	120	break;
	121	case opt_type:
	122	if (match_fourchar(&args[0], &sbi->type)) {
d6142673	123	pr_err("type requires a 4 character value\n");
1da177e4 LT	124	return 0;
	125	}
	126	break;
	127	case opt_umask:
	128	if (match_octal(&args[0], &tmp)) {
d6142673	129	pr_err("umask requires a value\n");
1da177e4 LT	130	return 0;
	131	}
	132	sbi->umask = (umode_t)tmp;
	133	break;
	134	case opt_uid:
	135	if (match_int(&args[0], &tmp)) {
d6142673	136	pr_err("uid requires an argument\n");
1da177e4 LT	137	return 0;
1da177e4 LT	138	}
16525e3f EB	139	sbi->uid = make_kuid(current_user_ns(), (uid_t)tmp);
16525e3f EB	140	if (!uid_valid(sbi->uid)) {
d6142673	141	pr_err("invalid uid specified\n");
16525e3f EB	142	return 0;
16525e3f EB	143	}
1da177e4 LT	144	break;
	145	case opt_gid:
	146	if (match_int(&args[0], &tmp)) {
d6142673	147	pr_err("gid requires an argument\n");
1da177e4 LT	148	return 0;
1da177e4 LT	149	}
16525e3f EB	150	sbi->gid = make_kgid(current_user_ns(), (gid_t)tmp);
16525e3f EB	151	if (!gid_valid(sbi->gid)) {
d6142673	152	pr_err("invalid gid specified\n");
16525e3f EB	153	return 0;
16525e3f EB	154	}
1da177e4 LT	155	break;
	156	case opt_part:
	157	if (match_int(&args[0], &sbi->part)) {
d6142673	158	pr_err("part requires an argument\n");
1da177e4 LT	159	return 0;
	160	}
	161	break;
	162	case opt_session:
	163	if (match_int(&args[0], &sbi->session)) {
d6142673	164	pr_err("session requires an argument\n");
1da177e4 LT	165	return 0;
	166	}
	167	break;
	168	case opt_nls:
	169	if (sbi->nls) {
d6142673	170	pr_err("unable to change nls mapping\n");
1da177e4 LT	171	return 0;
	172	}
	173	p = match_strdup(&args[0]);
cd6fda36 JM	174	if (p)
cd6fda36 JM	175	sbi->nls = load_nls(p);
1da177e4	176	if (!sbi->nls) {
d8983ca0 FF	177	pr_err("unable to load nls mapping \"%s\"\n",
d8983ca0 FF	178	p);
1da177e4 LT	179	kfree(p);
	180	return 0;
	181	}
	182	kfree(p);
	183	break;
	184	case opt_decompose:
84adede3	185	clear_bit(HFSPLUS_SB_NODECOMPOSE, &sbi->flags);
1da177e4 LT	186	break;
1da177e4 LT	187	case opt_nodecompose:
84adede3	188	set_bit(HFSPLUS_SB_NODECOMPOSE, &sbi->flags);
1da177e4	189	break;
34a2d313 CH	190	case opt_barrier:
	191	clear_bit(HFSPLUS_SB_NOBARRIER, &sbi->flags);
	192	break;
	193	case opt_nobarrier:
	194	set_bit(HFSPLUS_SB_NOBARRIER, &sbi->flags);
	195	break;
b0b623c3	196	case opt_force:
84adede3	197	set_bit(HFSPLUS_SB_FORCE, &sbi->flags);
b0b623c3	198	break;
1da177e4 LT	199	default:
	200	return 0;
	201	}
	202	}
	203
	204	done:
	205	if (!sbi->nls) {
	206	/* try utf8 first, as this is the old default behaviour */
	207	sbi->nls = load_nls("utf8");
	208	if (!sbi->nls)
	209	sbi->nls = load_nls_default();
	210	if (!sbi->nls)
	211	return 0;
	212	}
	213
	214	return 1;
	215	}
717dd80e	216
34c80b1d	217	int hfsplus_show_options(struct seq_file seq, struct dentry root)
717dd80e	218	{
34c80b1d	219	struct hfsplus_sb_info *sbi = HFSPLUS_SB(root->d_sb);
717dd80e RZ	220
717dd80e RZ	221	if (sbi->creator != HFSPLUS_DEF_CR_TYPE)
a068acf2	222	seq_show_option_n(seq, "creator", (char *)&sbi->creator, 4);
717dd80e	223	if (sbi->type != HFSPLUS_DEF_CR_TYPE)
a068acf2	224	seq_show_option_n(seq, "type", (char *)&sbi->type, 4);
2753cc28	225	seq_printf(seq, ",umask=%o,uid=%u,gid=%u", sbi->umask,
16525e3f EB	226	from_kuid_munged(&init_user_ns, sbi->uid),
16525e3f EB	227	from_kgid_munged(&init_user_ns, sbi->gid));
717dd80e RZ	228	if (sbi->part >= 0)
	229	seq_printf(seq, ",part=%u", sbi->part);
	230	if (sbi->session >= 0)
	231	seq_printf(seq, ",session=%u", sbi->session);
	232	if (sbi->nls)
	233	seq_printf(seq, ",nls=%s", sbi->nls->charset);
84adede3	234	if (test_bit(HFSPLUS_SB_NODECOMPOSE, &sbi->flags))
d8983ca0	235	seq_puts(seq, ",nodecompose");
34a2d313	236	if (test_bit(HFSPLUS_SB_NOBARRIER, &sbi->flags))
d8983ca0	237	seq_puts(seq, ",nobarrier");
717dd80e RZ	238	return 0;
717dd80e RZ	239	}