/arch/um/drivers/cow.h

 1#ifndef __COW_H__
 2#define __COW_H__
 3
 4#include <asm/types.h>
 5
 6#if __BYTE_ORDER == __BIG_ENDIAN
 7# define ntohll(x) (x)
 8# define htonll(x) (x)
 9#elif __BYTE_ORDER == __LITTLE_ENDIAN
10# define ntohll(x)  bswap_64(x)
11# define htonll(x)  bswap_64(x)
12#else
13#error "__BYTE_ORDER not defined"
14#endif
15
16extern int init_cow_file(int fd, char *cow_file, char *backing_file,
17			 int sectorsize, int alignment, int *bitmap_offset_out,
18			 unsigned long *bitmap_len_out, int *data_offset_out);
19
20extern int file_reader(__u64 offset, char *buf, int len, void *arg);
21extern int read_cow_header(int (*reader)(__u64, char *, int, void *),
22			   void *arg, __u32 *version_out,
23			   char **backing_file_out, time_t *mtime_out,
24			   unsigned long long *size_out, int *sectorsize_out,
25			   __u32 *align_out, int *bitmap_offset_out);
26
27extern int write_cow_header(char *cow_file, int fd, char *backing_file,
28			    int sectorsize, int alignment,
29			    unsigned long long *size);
30
31extern void cow_sizes(int version, __u64 size, int sectorsize, int align,
32		      int bitmap_offset, unsigned long *bitmap_len_out,
33		      int *data_offset_out);
34
35#endif
36
37/*
38 * ---------------------------------------------------------------------------
39 * Local variables:
40 * c-file-style: "linux"
41 * End:
42 */