arch/um/drivers/cow.h

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