1*1da177e4SLinus Torvalds #ifndef __COW_H__ 2*1da177e4SLinus Torvalds #define __COW_H__ 3*1da177e4SLinus Torvalds 4*1da177e4SLinus Torvalds #include <asm/types.h> 5*1da177e4SLinus Torvalds 6*1da177e4SLinus Torvalds #if __BYTE_ORDER == __BIG_ENDIAN 7*1da177e4SLinus Torvalds # define ntohll(x) (x) 8*1da177e4SLinus Torvalds # define htonll(x) (x) 9*1da177e4SLinus Torvalds #elif __BYTE_ORDER == __LITTLE_ENDIAN 10*1da177e4SLinus Torvalds # define ntohll(x) bswap_64(x) 11*1da177e4SLinus Torvalds # define htonll(x) bswap_64(x) 12*1da177e4SLinus Torvalds #else 13*1da177e4SLinus Torvalds #error "__BYTE_ORDER not defined" 14*1da177e4SLinus Torvalds #endif 15*1da177e4SLinus Torvalds 16*1da177e4SLinus Torvalds extern int init_cow_file(int fd, char *cow_file, char *backing_file, 17*1da177e4SLinus Torvalds int sectorsize, int alignment, int *bitmap_offset_out, 18*1da177e4SLinus Torvalds unsigned long *bitmap_len_out, int *data_offset_out); 19*1da177e4SLinus Torvalds 20*1da177e4SLinus Torvalds extern int file_reader(__u64 offset, char *buf, int len, void *arg); 21*1da177e4SLinus Torvalds extern int read_cow_header(int (*reader)(__u64, char *, int, void *), 22*1da177e4SLinus Torvalds void *arg, __u32 *version_out, 23*1da177e4SLinus Torvalds char **backing_file_out, time_t *mtime_out, 24*1da177e4SLinus Torvalds unsigned long long *size_out, int *sectorsize_out, 25*1da177e4SLinus Torvalds __u32 *align_out, int *bitmap_offset_out); 26*1da177e4SLinus Torvalds 27*1da177e4SLinus Torvalds extern int write_cow_header(char *cow_file, int fd, char *backing_file, 28*1da177e4SLinus Torvalds int sectorsize, int alignment, 29*1da177e4SLinus Torvalds unsigned long long *size); 30*1da177e4SLinus Torvalds 31*1da177e4SLinus Torvalds extern void cow_sizes(int version, __u64 size, int sectorsize, int align, 32*1da177e4SLinus Torvalds int bitmap_offset, unsigned long *bitmap_len_out, 33*1da177e4SLinus Torvalds int *data_offset_out); 34*1da177e4SLinus Torvalds 35*1da177e4SLinus Torvalds #endif 36*1da177e4SLinus Torvalds 37*1da177e4SLinus Torvalds /* 38*1da177e4SLinus Torvalds * --------------------------------------------------------------------------- 39*1da177e4SLinus Torvalds * Local variables: 40*1da177e4SLinus Torvalds * c-file-style: "linux" 41*1da177e4SLinus Torvalds * End: 42*1da177e4SLinus Torvalds */ 43