jfs_xattr.h

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/*
 *   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

/*
 * 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 int jfs_setxattr(struct dentry *, const char *, const void *, size_t,
            int);
extern ssize_t __jfs_getxattr(struct inode *, const char *, void *, size_t);
extern ssize_t jfs_getxattr(struct dentry *, const char *, void *, size_t);
extern ssize_t jfs_listxattr(struct dentry *, char *, size_t);
extern int jfs_removexattr(struct dentry *, const char *);

#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 */