arch/um/drivers/cow.h

   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