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/*
* flushb.c --- This routine flushes the disk buffers for a disk
*
* Copyright 1997, 2000, by Theodore Ts'o.
*
* WARNING: use of flushb on some older 2.2 kernels on a heavily loaded
* system will corrupt filesystems. This program is not really useful
* beyond for benchmarking scripts.
*
* %Begin-Header%
* This file may be redistributed under the terms of the GNU Public
* License.
* %End-Header%
*/
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <stdlib.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#include <sys/mount.h>
#include "../misc/nls-enable.h"
/* For Linux, define BLKFLSBUF if necessary */
#if (!defined(BLKFLSBUF) && defined(__linux__))
#define BLKFLSBUF _IO(0x12,97) /* flush buffer cache */
#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);
}
/*
* Note: to reread the partition table, use the ioctl
* BLKRRPART instead of BLKFSLBUF.
*/
#ifdef BLKFLSBUF
if (ioctl(fd, BLKFLSBUF, 0) < 0) {
perror("ioctl BLKFLSBUF");
exit(1);
}
return 0;
#else
fprintf(stderr,
_("BLKFLSBUF ioctl not supported! Can't flush buffers.\n"));
return 1;
#endif
}
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