/usr/include/linux/reiserfs_xattr.h is in linux-libc-dev 4.15.0-20.21.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 | /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
/*
  File: linux/reiserfs_xattr.h
*/
#ifndef _LINUX_REISERFS_XATTR_H
#define _LINUX_REISERFS_XATTR_H
#include <linux/types.h>
/* Magic value in header */
#define REISERFS_XATTR_MAGIC 0x52465841	/* "RFXA" */
struct reiserfs_xattr_header {
	__le32 h_magic;		/* magic number for identification */
	__le32 h_hash;		/* hash of the value */
};
struct reiserfs_security_handle {
	const char *name;
	void *value;
	size_t length;
};
#endif  /*  _LINUX_REISERFS_XATTR_H  */
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