/* SPDX-License-Identifier: GPL-2.0 */
  /*
    File: fs/ext2/acl.h
  
    (C) 2001 Andreas Gruenbacher, <a.gruenbacher@computer.org>
  */
  
  #include <linux/posix_acl_xattr.h>
  
  #define EXT2_ACL_VERSION	0x0001
  
  typedef struct {
  	__le16		e_tag;
  	__le16		e_perm;
  	__le32		e_id;
  } ext2_acl_entry;
  
  typedef struct {
  	__le16		e_tag;
  	__le16		e_perm;
  } ext2_acl_entry_short;
  
  typedef struct {
  	__le32		a_version;
  } ext2_acl_header;
  
  static inline size_t ext2_acl_size(int count)
  {
  	if (count <= 4) {
  		return sizeof(ext2_acl_header) +
  		       count * sizeof(ext2_acl_entry_short);
  	} else {
  		return sizeof(ext2_acl_header) +
  		       4 * sizeof(ext2_acl_entry_short) +
  		       (count - 4) * sizeof(ext2_acl_entry);
  	}
  }
  
  static inline int ext2_acl_count(size_t size)
  {
  	ssize_t s;
  	size -= sizeof(ext2_acl_header);
  	s = size - 4 * sizeof(ext2_acl_entry_short);
  	if (s < 0) {
  		if (size % sizeof(ext2_acl_entry_short))
  			return -1;
  		return size / sizeof(ext2_acl_entry_short);
  	} else {
  		if (s % sizeof(ext2_acl_entry))
  			return -1;
  		return s / sizeof(ext2_acl_entry) + 4;
  	}
  }
  
  #ifdef CONFIG_EXT2_FS_POSIX_ACL
  
  /* acl.c */
  extern struct posix_acl *ext2_get_acl(struct inode *inode, int type);
  extern int ext2_set_acl(struct inode *inode, struct posix_acl *acl, int type);
  extern int ext2_init_acl (struct inode *, struct inode *);
  
  #else
  #include <linux/sched.h>
  #define ext2_get_acl	NULL
  #define ext2_set_acl	NULL
  
  static inline int ext2_init_acl (struct inode *inode, struct inode *dir)
  {
  	return 0;
  }
  #endif