LXR linux/include/linux/posix_acl

   1/*
   2  File: linux/posix_acl_xattr.h
   3
   4  Extended attribute system call representation of Access Control Lists.
   5
   6  Copyright (C) 2000 by Andreas Gruenbacher <a.gruenbacher@computer.org>
   7  Copyright (C) 2002 SGI - Silicon Graphics, Inc <linux-xfs@oss.sgi.com>
   8 */
   9#ifndef _POSIX_ACL_XATTR_H
  10#define _POSIX_ACL_XATTR_H
  11
  12#include <uapi/linux/xattr.h>
  13#include <uapi/linux/posix_acl_xattr.h>
  14#include <linux/posix_acl.h>
  15
  16static inline size_t
  17posix_acl_xattr_size(int count)
  18{
  19        return (sizeof(struct posix_acl_xattr_header) +
  20                (count * sizeof(struct posix_acl_xattr_entry)));
  21}
  22
  23static inline int
  24posix_acl_xattr_count(size_t size)
  25{
  26        if (size < sizeof(struct posix_acl_xattr_header))
  27                return -1;
  28        size -= sizeof(struct posix_acl_xattr_header);
  29        if (size % sizeof(struct posix_acl_xattr_entry))
  30                return -1;
  31        return size / sizeof(struct posix_acl_xattr_entry);
  32}
  33
  34#ifdef CONFIG_FS_POSIX_ACL
  35void posix_acl_fix_xattr_from_user(void *value, size_t size);
  36void posix_acl_fix_xattr_to_user(void *value, size_t size);
  37#else
  38static inline void posix_acl_fix_xattr_from_user(void *value, size_t size)
  39{
  40}
  41static inline void posix_acl_fix_xattr_to_user(void *value, size_t size)
  42{
  43}
  44#endif
  45
  46struct posix_acl *posix_acl_from_xattr(struct user_namespace *user_ns, 
  47                                       const void *value, size_t size);
  48int posix_acl_to_xattr(struct user_namespace *user_ns,
  49                       const struct posix_acl *acl, void *buffer, size_t size);
  50
  51extern const struct xattr_handler posix_acl_access_xattr_handler;
  52extern const struct xattr_handler posix_acl_default_xattr_handler;
  53
  54#endif  /* _POSIX_ACL_XATTR_H */
  55