/*
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* flushb.c --- This routine flushes the disk buffers for a disk
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*
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* Copyright 1997, 2000, by Theodore Ts'o.
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*
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* WARNING: use of flushb on some older 2.2 kernels on a heavily loaded
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* system will corrupt filesystems. This program is not really useful
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* beyond for benchmarking scripts.
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*
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* %Begin-Header%
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* This file may be redistributed under the terms of the GNU Public
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* License.
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* %End-Header%
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*/
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#include "config.h"
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#include <stdio.h>
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#include <string.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <fcntl.h>
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#include <sys/ioctl.h>
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#include <sys/mount.h>
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#include "../misc/nls-enable.h"
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/* For Linux, define BLKFLSBUF if necessary */
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#if (!defined(BLKFLSBUF) && defined(__linux__))
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#define BLKFLSBUF _IO(0x12,97) /* flush buffer cache */
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#endif
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const char *progname;
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static void usage(void)
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{
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fprintf(stderr, _("Usage: %s disk\n"), progname);
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exit(1);
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}
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int main(int argc, char **argv)
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{
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int fd;
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progname = argv[0];
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if (argc != 2)
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usage();
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fd = open(argv[1], O_RDONLY, 0);
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if (fd < 0) {
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perror("open");
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exit(1);
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}
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/*
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* Note: to reread the partition table, use the ioctl
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* BLKRRPART instead of BLKFSLBUF.
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*/
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#ifdef BLKFLSBUF
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if (ioctl(fd, BLKFLSBUF, 0) < 0) {
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perror("ioctl BLKFLSBUF");
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exit(1);
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}
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return 0;
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#else
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fprintf(stderr,
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_("BLKFLSBUF ioctl not supported! Can't flush buffers.\n"));
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return 1;
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#endif
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}
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