1 /*
2 * flushb.c --- This routine flushes the disk buffers for a disk
3 *
4 * Copyright 1997, 2000, by Theodore Ts'o.
5 *
6 * WARNING: use of flushb on some older 2.2 kernels on a heavily loaded
7 * system will corrupt filesystems. This program is not really useful
8 * beyond for benchmarking scripts.
9 *
10 * %Begin-Header%
11 * This file may be redistributed under the terms of the GNU Public
12 * License.
13 * %End-Header%
14 */
15
16 #include "config.h"
17 #include <stdio.h>
18 #include <string.h>
19 #include <unistd.h>
20 #include <stdlib.h>
21 #include <fcntl.h>
22 #include <sys/ioctl.h>
23 #include <sys/mount.h>
24 #include "../misc/nls-enable.h"
25
26 /* For Linux, define BLKFLSBUF if necessary */
27 #if (!defined(BLKFLSBUF) && defined(__linux__))
28 #define BLKFLSBUF _IO(0x12,97) /* flush buffer cache */
29 #endif
30
31 const char *progname;
32
usage(void)33 static void usage(void)
34 {
35 fprintf(stderr, _("Usage: %s disk\n"), progname);
36 exit(1);
37 }
38
main(int argc,char ** argv)39 int main(int argc, char **argv)
40 {
41 int fd;
42
43 progname = argv[0];
44 if (argc != 2)
45 usage();
46
47 fd = open(argv[1], O_RDONLY, 0);
48 if (fd < 0) {
49 perror("open");
50 exit(1);
51 }
52 /*
53 * Note: to reread the partition table, use the ioctl
54 * BLKRRPART instead of BLKFSLBUF.
55 */
56 #ifdef BLKFLSBUF
57 if (ioctl(fd, BLKFLSBUF, 0) < 0) {
58 perror("ioctl BLKFLSBUF");
59 exit(1);
60 }
61 return 0;
62 #else
63 fprintf(stderr,
64 _("BLKFLSBUF ioctl not supported! Can't flush buffers.\n"));
65 return 1;
66 #endif
67 }
68