arch/um/drivers/cow.h

   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                            __u64 *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  */