blob: dc36b222100b9abde780f996407a758f336afce4 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001#ifndef __COW_H__
2#define __COW_H__
3
4#include <asm/types.h>
5
Paolo 'Blaisorblade' Giarrusso028c0cc2005-10-09 21:37:45 +02006#if defined(__KERNEL__)
7
8# include <asm/byteorder.h>
9
10# if defined(__BIG_ENDIAN)
11# define ntohll(x) (x)
12# define htonll(x) (x)
13# elif defined(__LITTLE_ENDIAN)
14# define ntohll(x) be64_to_cpu(x)
15# define htonll(x) cpu_to_be64(x)
16# else
17# error "Could not determine byte order"
18# endif
19
20#else
21/* For the definition of ntohl, htonl and __BYTE_ORDER */
22#include <endian.h>
23#include <netinet/in.h>
24#if defined(__BYTE_ORDER)
25
Paolo 'Blaisorblade' Giarrusso52a2d3e2005-10-09 21:37:53 +020026# if __BYTE_ORDER == __BIG_ENDIAN
27# define ntohll(x) (x)
28# define htonll(x) (x)
29# elif __BYTE_ORDER == __LITTLE_ENDIAN
30# define ntohll(x) bswap_64(x)
31# define htonll(x) bswap_64(x)
32# else
33# error "Could not determine byte order: __BYTE_ORDER uncorrectly defined"
34# endif
Linus Torvalds1da177e2005-04-16 15:20:36 -070035
Paolo 'Blaisorblade' Giarrusso028c0cc2005-10-09 21:37:45 +020036#else /* ! defined(__BYTE_ORDER) */
37# error "Could not determine byte order: __BYTE_ORDER not defined"
38#endif
39#endif /* ! defined(__KERNEL__) */
40
Linus Torvalds1da177e2005-04-16 15:20:36 -070041extern int init_cow_file(int fd, char *cow_file, char *backing_file,
42 int sectorsize, int alignment, int *bitmap_offset_out,
43 unsigned long *bitmap_len_out, int *data_offset_out);
44
45extern int file_reader(__u64 offset, char *buf, int len, void *arg);
46extern int read_cow_header(int (*reader)(__u64, char *, int, void *),
47 void *arg, __u32 *version_out,
48 char **backing_file_out, time_t *mtime_out,
49 unsigned long long *size_out, int *sectorsize_out,
50 __u32 *align_out, int *bitmap_offset_out);
51
52extern int write_cow_header(char *cow_file, int fd, char *backing_file,
53 int sectorsize, int alignment,
54 unsigned long long *size);
55
56extern void cow_sizes(int version, __u64 size, int sectorsize, int align,
57 int bitmap_offset, unsigned long *bitmap_len_out,
58 int *data_offset_out);
59
60#endif
61
62/*
63 * ---------------------------------------------------------------------------
64 * Local variables:
65 * c-file-style: "linux"
66 * End:
67 */