text: /* SPDX-License-Identifier: GPL-2.0 */
  /*
    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 <uapi/linux/xattr.h>
  #include <uapi/linux/posix_acl_xattr.h>
  #include <linux/posix_acl.h>
  
  static inline size_t
  posix_acl_xattr_size(int count)
  {
  	return (sizeof(struct posix_acl_xattr_header) +
  		(count * sizeof(struct posix_acl_xattr_entry)));
  }
  
  static inline int
  posix_acl_xattr_count(size_t size)
  {
  	if (size < sizeof(struct posix_acl_xattr_header))
  		return -1;
  	size -= sizeof(struct posix_acl_xattr_header);
  	if (size % sizeof(struct posix_acl_xattr_entry))
  		return -1;
  	return size / sizeof(struct posix_acl_xattr_entry);
  }
  
  #ifdef CONFIG_FS_POSIX_ACL
  void posix_acl_fix_xattr_from_user(struct user_namespace *mnt_userns,
  				   void *value, size_t size);
  void posix_acl_fix_xattr_to_user(struct user_namespace *mnt_userns,
  				 void *value, size_t size);
  #else
  static inline void posix_acl_fix_xattr_from_user(struct user_namespace *mnt_userns,
  						 void *value, size_t size)
  {
  }
  static inline void posix_acl_fix_xattr_to_user(struct user_namespace *mnt_userns,
  					       void *value, size_t size)
  {
  }
  #endif
  
  struct posix_acl *posix_acl_from_xattr(struct user_namespace *user_ns, 
  				       const void *value, size_t size);
  int posix_acl_to_xattr(struct user_namespace *user_ns,
  		       const struct posix_acl *acl, void *buffer, size_t size);
  
  extern const struct xattr_handler posix_acl_access_xattr_handler;
  extern const struct xattr_handler posix_acl_default_xattr_handler;
  
  #endif	/* _POSIX_ACL_XATTR_H */
  