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/*

  File: linux/posix_acl_xattr.h

  Extended attribute system call representation of Access Control Lists.

  Copyright (C) 2000 by Andreas Gruenbacher <a.gruenbacher@computer.org>

  Copyright (C) 2002 SGI - Silicon Graphics, Inc <linux-xfs@oss.sgi.com>

 */

#ifndef _POSIX_ACL_XATTR_H

#define _POSIX_ACL_XATTR_H

#include <linux/posix_acl.h>

/* Extended attribute names */

#define POSIX_ACL_XATTR_ACCESS  "system.posix_acl_access"

#define POSIX_ACL_XATTR_DEFAULT "system.posix_acl_default"

/* Supported ACL a_version fields */

#define POSIX_ACL_XATTR_VERSION 0x0002

/* An undefined entry e_id value */

#define ACL_UNDEFINED_ID        (-1)

typedef struct {

        __le16                  e_tag;

        __le16                  e_perm;

        __le32                  e_id;

} posix_acl_xattr_entry;

typedef struct {

        __le32                  a_version;

        posix_acl_xattr_entry   a_entries[0];

} posix_acl_xattr_header;

static inline size_t

posix_acl_xattr_size(int count)

{

        return (sizeof(posix_acl_xattr_header) +

                (count * sizeof(posix_acl_xattr_entry)));

}

static inline int

posix_acl_xattr_count(size_t size)

{

        if (size < sizeof(posix_acl_xattr_header))

                return -1;

        size -= sizeof(posix_acl_xattr_header);

        if (size % sizeof(posix_acl_xattr_entry))

                return -1;

        return size / sizeof(posix_acl_xattr_entry);

}

struct posix_acl *posix_acl_from_xattr(const void *value, size_t size);

int posix_acl_to_xattr(const struct posix_acl *acl, void *buffer, size_t size);

#endif  /* _POSIX_ACL_XATTR_H */