101 lines
1.6 KiB
C
101 lines
1.6 KiB
C
/* diskctl - control disk device driver parameters - by D.C. van Moolenbroek */
|
|
#include <stdlib.h>
|
|
#include <stdio.h>
|
|
#include <sys/ioctl.h>
|
|
#include <unistd.h>
|
|
#include <fcntl.h>
|
|
|
|
static char *name, *dev;
|
|
|
|
static void usage(void)
|
|
{
|
|
fprintf(stderr, "usage: %s <device> <command> [args]\n"
|
|
"\n"
|
|
"supported commands:\n"
|
|
" getwcache return write cache status\n"
|
|
" setwcache [on|off] set write cache status\n"
|
|
" flush flush write cache\n",
|
|
name);
|
|
|
|
exit(EXIT_FAILURE);
|
|
}
|
|
|
|
static int open_dev(int flags)
|
|
{
|
|
int fd;
|
|
|
|
fd = open(dev, flags);
|
|
|
|
if (fd < 0) {
|
|
perror("open");
|
|
|
|
exit(EXIT_FAILURE);
|
|
}
|
|
|
|
return fd;
|
|
}
|
|
|
|
int main(int argc, char **argv)
|
|
{
|
|
int fd, val;
|
|
|
|
name = argv[0];
|
|
|
|
if (argc < 3) usage();
|
|
|
|
dev = argv[1];
|
|
|
|
if (!strcasecmp(argv[2], "getwcache")) {
|
|
if (argc != 3) usage();
|
|
|
|
fd = open_dev(O_RDONLY);
|
|
|
|
if (ioctl(fd, DIOCGETWC, &val) != 0) {
|
|
perror("ioctl");
|
|
|
|
return EXIT_FAILURE;
|
|
}
|
|
|
|
close(fd);
|
|
|
|
printf("write cache is %s\n", val ? "on" : "off");
|
|
}
|
|
else if (!strcasecmp(argv[2], "setwcache")) {
|
|
if (argc != 4) usage();
|
|
|
|
fd = open_dev(O_WRONLY);
|
|
|
|
if (!strcasecmp(argv[3], "on")) val = 1;
|
|
else if (!strcasecmp(argv[3], "off")) val = 0;
|
|
else usage();
|
|
|
|
if (ioctl(fd, DIOCSETWC, &val) != 0) {
|
|
perror("ioctl");
|
|
|
|
return EXIT_FAILURE;
|
|
}
|
|
|
|
close(fd);
|
|
|
|
printf("write cache %sabled\n", val ? "en" : "dis");
|
|
}
|
|
else if (!strcasecmp(argv[2], "flush")) {
|
|
if (argc != 3) usage();
|
|
|
|
fd = open_dev(O_WRONLY);
|
|
|
|
if (ioctl(fd, DIOCFLUSH, NULL) != 0) {
|
|
perror("ioctl");
|
|
|
|
return EXIT_FAILURE;
|
|
}
|
|
|
|
close(fd);
|
|
|
|
printf("write cache flushed\n");
|
|
}
|
|
else usage();
|
|
|
|
return EXIT_SUCCESS;
|
|
}
|