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 41 extern 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 45 extern int file_reader(__u64 offset, char *buf, int len, void *arg); 46 extern 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 52 extern int write_cow_header(char *cow_file, int fd, char *backing_file, 53 int sectorsize, int alignment, 54 unsigned long long *size); 55 56 extern 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