mirror of https://github.com/vitalif/e2fsprogs
77 lines
2.1 KiB
C
77 lines
2.1 KiB
C
/*
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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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* This program may be used under the provisions of the GNU Public
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* License, *EXCEPT* that a binary copy of the executable may not be
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* packaged as a part of binary package which is distributed as part
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* of a Linux distribution. (Yes, this violates the Debian Free
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* Software Guidelines of restricting its field of use. That's the
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* point. I don't want this program being distributed in Debian,
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* because I don't care to support it, and the maintainer, Yann
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* Dirson, doesn't seem to pay attention to my wishes on this matter.
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* So I'm deliberately adding this clause so it violates the Debian
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* Free Software Guidelines to force him to take it out. (What part
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* of THIS IS FOR MY OWN USE don't you understand? And no, I'm going
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* to write a man page for it either. And don't file a bug about it
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* or bug me about it.) If this doesn't work, I'll have to remove it
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* from the upstream source distribution at the next release. End of
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* Rant. :-)
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*
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* (BTW, use of flushb on some older 2.2 kernels on a heavily loaded
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* system will corrupt filesystems.)
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*/
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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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