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