1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
|
/*
* flushb.c --- This routine flushes the disk buffers for a disk
*
* Copyright 1997, 2000, by Theodore Ts'o.
*
* This program may be used under the provisions of the GNU Public
* License, *EXCEPT* that a binary copy of the executable may not be
* packaged as a part of binary package which is distributed as part
* of a Linux distribution. (Yes, this violates the Debian Free
* Software Guidelines of restricting its field of use. That's the
* point. I don't want this program being distributed in Debian,
* because I don't care to support it, and the maintainer, Yann
* Dirson, doesn't seem to pay attention to my wishes on this matter.
* So I'm deliberately adding this clause so it violates the Debian
* Free Software Guidelines to force him to take it out. (What part
* of THIS IS FOR MY OWN USE don't you understand? And no, I'm going
* to write a man page for it either. And don't file a bug about it
* or bug me about it.) If this doesn't work, I'll have to remove it
* from the upstream source distribution at the next release. End of
* Rant. :-)
*
* (BTW, use of flushb on some older 2.2 kernels on a heavily loaded
* system will corrupt filesystems.)
*/
#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
}
|
