#ifndef __COW_H__
  #define __COW_H__
  
  #include <asm/types.h>

  extern int init_cow_file(int fd, char *cow_file, char *backing_file,
  			 int sectorsize, int alignment, int *bitmap_offset_out,
  			 unsigned long *bitmap_len_out, int *data_offset_out);
  
  extern int file_reader(__u64 offset, char *buf, int len, void *arg);
  extern int read_cow_header(int (*reader)(__u64, char *, int, void *),
  			   void *arg, __u32 *version_out,
  			   char **backing_file_out, time_t *mtime_out,

  			   unsigned long long *size_out, int *sectorsize_out,

  			   __u32 *align_out, int *bitmap_offset_out);
  
  extern int write_cow_header(char *cow_file, int fd, char *backing_file,
  			    int sectorsize, int alignment,
  			    unsigned long long *size);
  
  extern void cow_sizes(int version, __u64 size, int sectorsize, int align,
  		      int bitmap_offset, unsigned long *bitmap_len_out,
  		      int *data_offset_out);
  
  #endif
  
  /*
   * ---------------------------------------------------------------------------
   * Local variables:
   * c-file-style: "linux"
   * End:
   */