jfs_xattr.h 2.51 KB
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/*
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 *   Copyright (C) International Business Machines Corp., 2000-2002
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 *
 *   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

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#include <linux/xattr.h>

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/*
 * 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)))

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

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extern const struct xattr_handler *jfs_xattr_handlers[];

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

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#endif	/* H_JFS_XATTR */