[mirror_ubuntu-bionic-kernel.git] / fs / jfs / jfs_xattr.h

/*
 *   Copyright (C) International Business Machines Corp., 2000-2002
 *
 *   This program is free software;  you can redistribute it and/or modify
 *   it under the terms of the GNU General Public License as published by
 *   the Free Software Foundation; either version 2 of the License, or
 *   (at your option) any later version.
 *
 *   This program is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY;  without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
 *   the GNU General Public License for more details.
 *
 *   You should have received a copy of the GNU General Public License
 *   along with this program;  if not, write to the Free Software
 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */

#ifndef H_JFS_XATTR
#define H_JFS_XATTR

#include <linux/xattr.h>

/*
 * jfs_ea_list describe the on-disk format of the extended attributes.
 * I know the null-terminator is redundant since namelen is stored, but
 * I am maintaining compatibility with OS/2 where possible.
 */
struct jfs_ea {
	u8 flag;	/* Unused? */
	u8 namelen;	/* Length of name */
	__le16 valuelen;	/* Length of value */
	char name[0];	/* Attribute name (includes null-terminator) */
};			/* Value immediately follows name */

struct jfs_ea_list {
	__le32 size;		/* overall size */
	struct jfs_ea ea[0];	/* Variable length list */
};

/* Macros for defining maxiumum number of bytes supported for EAs */
#define MAXEASIZE	65535
#define MAXEALISTSIZE	MAXEASIZE

/*
 * some macros for dealing with variable length EA lists.
 */
#define EA_SIZE(ea) \
	(sizeof (struct jfs_ea) + (ea)->namelen + 1 + \
	 le16_to_cpu((ea)->valuelen))
#define	NEXT_EA(ea) ((struct jfs_ea *) (((char *) (ea)) + (EA_SIZE (ea))))
#define	FIRST_EA(ealist) ((ealist)->ea)
#define	EALIST_SIZE(ealist) le32_to_cpu((ealist)->size)
#define	END_EALIST(ealist) \
	((struct jfs_ea *) (((char *) (ealist)) + EALIST_SIZE(ealist)))

extern int __jfs_setxattr(tid_t, struct inode *, const char *, const void *,
			  size_t, int);
extern ssize_t __jfs_getxattr(struct inode *, const char *, void *, size_t);
extern ssize_t jfs_listxattr(struct dentry *, char *, size_t);

extern const struct xattr_handler *jfs_xattr_handlers[];

#ifdef CONFIG_JFS_SECURITY
extern int jfs_init_security(tid_t, struct inode *, struct inode *,
			     const struct qstr *);
#else
static inline int jfs_init_security(tid_t tid, struct inode *inode,
				    struct inode *dir, const struct qstr *qstr)
{
	return 0;
}
#endif

#endif	/* H_JFS_XATTR */
Commit	Line	Data
1da177e4	1	/*
63f83c9f	2	* Copyright (C) International Business Machines Corp., 2000-2002
1da177e4 LT	3	*
	4	* This program is free software; you can redistribute it and/or modify
	5	* it under the terms of the GNU General Public License as published by
	6	* the Free Software Foundation; either version 2 of the License, or
	7	* (at your option) any later version.
	8	*
	9	* This program is distributed in the hope that it will be useful,
	10	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	11	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
	12	* the GNU General Public License for more details.
	13	*
	14	* You should have received a copy of the GNU General Public License
	15	* along with this program; if not, write to the Free Software
	16	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	17	*/
	18
	19	#ifndef H_JFS_XATTR
	20	#define H_JFS_XATTR
	21
c8b6056a AG	22	#include <linux/xattr.h>
c8b6056a AG	23
1da177e4 LT	24	/*
	25	* jfs_ea_list describe the on-disk format of the extended attributes.
	26	* I know the null-terminator is redundant since namelen is stored, but
	27	* I am maintaining compatibility with OS/2 where possible.
	28	*/
	29	struct jfs_ea {
	30	u8 flag; /* Unused? */
	31	u8 namelen; /* Length of name */
	32	__le16 valuelen; /* Length of value */
	33	char name[0]; /* Attribute name (includes null-terminator) */
	34	}; /* Value immediately follows name */
	35
	36	struct jfs_ea_list {
	37	__le32 size; /* overall size */
	38	struct jfs_ea ea[0]; /* Variable length list */
	39	};
	40
	41	/* Macros for defining maxiumum number of bytes supported for EAs */
	42	#define MAXEASIZE 65535
	43	#define MAXEALISTSIZE MAXEASIZE
	44
	45	/*
	46	* some macros for dealing with variable length EA lists.
	47	*/
	48	#define EA_SIZE(ea) \
	49	(sizeof (struct jfs_ea) + (ea)->namelen + 1 + \
	50	le16_to_cpu((ea)->valuelen))
	51	#define NEXT_EA(ea) ((struct jfs_ea ) (((char ) (ea)) + (EA_SIZE (ea))))
	52	#define FIRST_EA(ealist) ((ealist)->ea)
	53	#define EALIST_SIZE(ealist) le32_to_cpu((ealist)->size)
	54	#define END_EALIST(ealist) \
	55	((struct jfs_ea ) (((char ) (ealist)) + EALIST_SIZE(ealist)))
	56
4f4b401b DK	57	extern int __jfs_setxattr(tid_t, struct inode , const char , const void *,
4f4b401b DK	58	size_t, int);
1da177e4	59	extern ssize_t __jfs_getxattr(struct inode , const char , void *, size_t);
1da177e4	60	extern ssize_t jfs_listxattr(struct dentry , char , size_t);
1da177e4	61
2cc6a5a0 CH	62	extern const struct xattr_handler *jfs_xattr_handlers[];
2cc6a5a0 CH	63
1d15b10f	64	#ifdef CONFIG_JFS_SECURITY
2a7dba39 EP	65	extern int jfs_init_security(tid_t, struct inode , struct inode ,
2a7dba39 EP	66	const struct qstr *);
1d15b10f DK	67	#else
1d15b10f DK	68	static inline int jfs_init_security(tid_t tid, struct inode *inode,
2a7dba39	69	struct inode dir, const struct qstr qstr)
1d15b10f DK	70	{
	71	return 0;
	72	}
	73	#endif
	74
1da177e4	75	#endif /* H_JFS_XATTR */