/usr/include/repair/format.h is in libreiser4-dev 1.2.0-2.
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 26 27 28 29 30 31 32 33 34 35 36 | /*  Copyright 2001-2005 by Hans Reiser, licensing governed by
    reiser4progs/COPYING.
    
    repair/format.h -- reiserfs filesystem recovery structures and
    macros. */
#ifndef REPAIR_FORMAT_H
#define REPAIR_FORMAT_H
#include <reiser4/filesystem.h>
extern errno_t repair_format_check_struct(reiser4_fs_t *fs, 
					  uint8_t mode, uint32_t options);
extern errno_t repair_format_update(reiser4_format_t *format);
extern errno_t repair_format_pack(reiser4_format_t *format, 
				  aal_stream_t *stream);
extern reiser4_format_t *repair_format_unpack(reiser4_fs_t *fs,
					      aal_stream_t *stream);
extern void repair_format_print(reiser4_format_t *format, 
				aal_stream_t *stream);
extern errno_t repair_format_check_backup(aal_device_t *device, 
					  backup_hint_t *hint);
extern count_t repair_format_len_old(aal_device_t *device, 
				     uint32_t blksize);
extern errno_t repair_format_check_len_old(aal_device_t *device, 
					   uint32_t blksize, 
					   count_t blocks);
#endif
 |