11da177e4SLinus Torvalds #ifndef __COW_H__ 21da177e4SLinus Torvalds #define __COW_H__ 31da177e4SLinus Torvalds 41da177e4SLinus Torvalds #include <asm/types.h> 51da177e4SLinus Torvalds 6028c0cc1SPaolo 'Blaisorblade' Giarrusso #if defined(__KERNEL__) 7028c0cc1SPaolo 'Blaisorblade' Giarrusso 8028c0cc1SPaolo 'Blaisorblade' Giarrusso # include <asm/byteorder.h> 9028c0cc1SPaolo 'Blaisorblade' Giarrusso 10028c0cc1SPaolo 'Blaisorblade' Giarrusso # if defined(__BIG_ENDIAN) 11028c0cc1SPaolo 'Blaisorblade' Giarrusso # define ntohll(x) (x) 12028c0cc1SPaolo 'Blaisorblade' Giarrusso # define htonll(x) (x) 13028c0cc1SPaolo 'Blaisorblade' Giarrusso # elif defined(__LITTLE_ENDIAN) 14028c0cc1SPaolo 'Blaisorblade' Giarrusso # define ntohll(x) be64_to_cpu(x) 15028c0cc1SPaolo 'Blaisorblade' Giarrusso # define htonll(x) cpu_to_be64(x) 16028c0cc1SPaolo 'Blaisorblade' Giarrusso # else 17028c0cc1SPaolo 'Blaisorblade' Giarrusso # error "Could not determine byte order" 18028c0cc1SPaolo 'Blaisorblade' Giarrusso # endif 19028c0cc1SPaolo 'Blaisorblade' Giarrusso 20028c0cc1SPaolo 'Blaisorblade' Giarrusso #else 21028c0cc1SPaolo 'Blaisorblade' Giarrusso /* For the definition of ntohl, htonl and __BYTE_ORDER */ 22028c0cc1SPaolo 'Blaisorblade' Giarrusso #include <endian.h> 23028c0cc1SPaolo 'Blaisorblade' Giarrusso #include <netinet/in.h> 24028c0cc1SPaolo 'Blaisorblade' Giarrusso #if defined(__BYTE_ORDER) 25028c0cc1SPaolo 'Blaisorblade' Giarrusso 26855ec613SPaolo 'Blaisorblade' Giarrusso # if __BYTE_ORDER == __BIG_ENDIAN 271da177e4SLinus Torvalds # define ntohll(x) (x) 281da177e4SLinus Torvalds # define htonll(x) (x) 29855ec613SPaolo 'Blaisorblade' Giarrusso # elif __BYTE_ORDER == __LITTLE_ENDIAN 301da177e4SLinus Torvalds # define ntohll(x) bswap_64(x) 311da177e4SLinus Torvalds # define htonll(x) bswap_64(x) 321da177e4SLinus Torvalds # else 33028c0cc1SPaolo 'Blaisorblade' Giarrusso # error "Could not determine byte order: __BYTE_ORDER uncorrectly defined" 341da177e4SLinus Torvalds # endif 351da177e4SLinus Torvalds 36028c0cc1SPaolo 'Blaisorblade' Giarrusso #else /* ! defined(__BYTE_ORDER) */ 37028c0cc1SPaolo 'Blaisorblade' Giarrusso # error "Could not determine byte order: __BYTE_ORDER not defined" 38028c0cc1SPaolo 'Blaisorblade' Giarrusso #endif 39028c0cc1SPaolo 'Blaisorblade' Giarrusso #endif /* ! defined(__KERNEL__) */ 40028c0cc1SPaolo 'Blaisorblade' Giarrusso 411da177e4SLinus Torvalds extern int init_cow_file(int fd, char *cow_file, char *backing_file, 421da177e4SLinus Torvalds int sectorsize, int alignment, int *bitmap_offset_out, 431da177e4SLinus Torvalds unsigned long *bitmap_len_out, int *data_offset_out); 441da177e4SLinus Torvalds 451da177e4SLinus Torvalds extern int file_reader(__u64 offset, char *buf, int len, void *arg); 461da177e4SLinus Torvalds extern int read_cow_header(int (*reader)(__u64, char *, int, void *), 471da177e4SLinus Torvalds void *arg, __u32 *version_out, 481da177e4SLinus Torvalds char **backing_file_out, time_t *mtime_out, 49*52c73782SPaolo 'Blaisorblade' Giarrusso unsigned long long *size_out, int *sectorsize_out, 501da177e4SLinus Torvalds __u32 *align_out, int *bitmap_offset_out); 511da177e4SLinus Torvalds 521da177e4SLinus Torvalds extern int write_cow_header(char *cow_file, int fd, char *backing_file, 531da177e4SLinus Torvalds int sectorsize, int alignment, 541da177e4SLinus Torvalds unsigned long long *size); 551da177e4SLinus Torvalds 561da177e4SLinus Torvalds extern void cow_sizes(int version, __u64 size, int sectorsize, int align, 571da177e4SLinus Torvalds int bitmap_offset, unsigned long *bitmap_len_out, 581da177e4SLinus Torvalds int *data_offset_out); 591da177e4SLinus Torvalds 601da177e4SLinus Torvalds #endif 611da177e4SLinus Torvalds 621da177e4SLinus Torvalds /* 631da177e4SLinus Torvalds * --------------------------------------------------------------------------- 641da177e4SLinus Torvalds * Local variables: 651da177e4SLinus Torvalds * c-file-style: "linux" 661da177e4SLinus Torvalds * End: 671da177e4SLinus Torvalds */ 68