zfs-weird.c

#include <fcntl.h>
#include <unistd.h>
#include <sys/stat.h>
#include <stdio.h>

int main()
{
	int fd = open("test", O_RDWR | O_CREAT | O_TRUNC, 0666);
	if (fd < 0)	
		return 1;
	ftruncate(fd, 0x100000);
	int c = 10;
	write(fd, &c, sizeof(c));
	pwrite(fd, &c, sizeof(c), 0x100000);
	fsync(fd);
	struct stat buf;
	fstat(fd, &buf);
	printf("Blocks: %lu\n", buf.st_blocks);
}