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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>
*/
#ifndef _POSIX_ACL_XATTR_H
#define _POSIX_ACL_XATTR_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)
/* ACL entry e_tag field values */
#define ACL_USER_OBJ (0x01)
#define ACL_USER (0x02)
#define ACL_GROUP_OBJ (0x04)
#define ACL_GROUP (0x08)
#define ACL_MASK (0x10)
#define ACL_OTHER (0x20)
/* ACL entry e_perm bitfield values */
#define ACL_READ (0x04)
#define ACL_WRITE (0x02)
#define ACL_EXECUTE (0x01)
typedef struct {
__u16 e_tag;
__u16 e_perm;
__u32 e_id;
} posix_acl_xattr_entry;
typedef struct {
__u32 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);
}
#endif /* _POSIX_ACL_XATTR_H */
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