write_pos
#define write_pos fssh_write_pos
write_pos(int fd, off_t pos, const void *buffer, size_t bufferSize)
write_pos(int fd, off_t offset, const void *buffer, size_t bufferSize)
write_pos(int fd, off_t pos, const void *buffer, size_t bufferSize)
void write_pos() {}
void write_pos() {}
# define write_pos(fd, pos, buffer, size) pwrite(fd, buffer, size, pos)
#undef write_pos
#define write_pos block_cache_write_pos