1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef __COW_H__ 3 #define __COW_H__ 4 5 #include <asm/types.h> 6 7 extern int init_cow_file(int fd, char *cow_file, char *backing_file, 8 int sectorsize, int alignment, int *bitmap_offset_out, 9 unsigned long *bitmap_len_out, int *data_offset_out); 10 11 extern int file_reader(__u64 offset, char *buf, int len, void *arg); 12 extern int read_cow_header(int (*reader)(__u64, char *, int, void *), 13 void *arg, __u32 *version_out, 14 char **backing_file_out, long long *mtime_out, 15 unsigned long long *size_out, int *sectorsize_out, 16 __u32 *align_out, int *bitmap_offset_out); 17 18 extern int write_cow_header(char *cow_file, int fd, char *backing_file, 19 int sectorsize, int alignment, 20 unsigned long long *size); 21 22 extern void cow_sizes(int version, __u64 size, int sectorsize, int align, 23 int bitmap_offset, unsigned long *bitmap_len_out, 24 int *data_offset_out); 25 26 #endif 27