/*
 * trigger the debugging ioctl 
 */

#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <stdlib.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#include <sys/mount.h>

/* For Linux, define BLKFLSBUF if necessary */
#if (!defined(EXT4_IOC_DEBUG_DELALLOC) && defined(__linux__))
#define EXT4_IOC_DEBUG_DELALLOC		_IO('f', 42)
#endif

const char *progname;

static void usage(void)
{
	fprintf(stderr, "Usage: %s disk\n", progname);
	exit(1);
}

int main(int argc, char **argv)
{
	int	fd;

	progname = argv[0];
	if (argc != 2)
		usage();

	fd = open(argv[1], O_RDONLY, 0);
	if (fd < 0) {
		perror("open");
		exit(1);
	}
#ifdef EXT4_IOC_DEBUG_DELALLOC
	if (ioctl(fd, EXT4_IOC_DEBUG_DELALLOC, 0) < 0) {
		perror("ioctl BLKFLSBUF");
		exit(1);
	}
	return 0;
#else
	fprintf(stderr,
		"EXT4_IOC_DEBUG_DELALLOC ioctl not supported!\n");
	return 1;
#endif
}