1#ifndef __COW_H__ 2#define __COW_H__ 3 4#include <asm/types.h> 5 6#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 26# 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 35 36#else /* ! defined(__BYTE_ORDER) */ 37# error "Could not determine byte order: __BYTE_ORDER not defined" 38#endif 39#endif /* ! defined(__KERNEL__) */ 40 41extern 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 */ 68