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/*
  File: linux/xattr_acl.h

  (extended attribute representation of access control lists)

  (C) 2000 Andreas Gruenbacher, <a.gruenbacher@computer.org>
*/

#ifndef _LINUX_XATTR_ACL_H
#define _LINUX_XATTR_ACL_H

#include <linux/posix_acl.h>

#define XATTR_NAME_ACL_ACCESS   "system.posix_acl_access"
#define XATTR_NAME_ACL_DEFAULT  "system.posix_acl_default"

#define XATTR_ACL_VERSION       0x0002

typedef struct {
        __u16           e_tag;
        __u16           e_perm;
        __u32           e_id;
} xattr_acl_entry;

typedef struct {
        __u32           a_version;
        xattr_acl_entry a_entries[0];
} xattr_acl_header;

static inline size_t xattr_acl_size(int count)
{
        return sizeof(xattr_acl_header) + count * sizeof(xattr_acl_entry);
}

static inline int xattr_acl_count(size_t size)
{
        if (size < sizeof(xattr_acl_header))
                return -1;
        size -= sizeof(xattr_acl_header);
        if (size % sizeof(xattr_acl_entry))
                return -1;
        return size / sizeof(xattr_acl_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 /* _LINUX_XATTR_ACL_H */