trivial: doc: hpfall: accept disk device to unload as argument
Allows users who use an IDE driver for their disk to use hpfall without having to modify the source. By default /dev/sda is used. Suggested by Christian Thaeter in http://lkml.org/lkml/2009/3/25/505. While we're add it, improve error message if opening /dev/freefall fails. Signed-off-by: Frans Pop <elendil@planet.nl> Cc: Christian Thaeter <ct@pipapo.org> Acked-by: Pavel Machek <pavel@ucw.cz> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
This commit is contained in:
parent
2bace8b951
commit
be3990b7ef
|
@ -19,6 +19,32 @@
|
|||
#include <sys/mman.h>
|
||||
#include <sched.h>
|
||||
|
||||
char unload_heads_path[64];
|
||||
|
||||
int set_unload_heads_path(char *device)
|
||||
{
|
||||
char devname[64];
|
||||
|
||||
if (strlen(device) <= 5 || strncmp(device, "/dev/", 5) != 0)
|
||||
return -EINVAL;
|
||||
strncpy(devname, device + 5, sizeof(devname));
|
||||
|
||||
snprintf(unload_heads_path, sizeof(unload_heads_path),
|
||||
"/sys/block/%s/device/unload_heads", devname);
|
||||
return 0;
|
||||
}
|
||||
int valid_disk(void)
|
||||
{
|
||||
int fd = open(unload_heads_path, O_RDONLY);
|
||||
if (fd < 0) {
|
||||
perror(unload_heads_path);
|
||||
return 0;
|
||||
}
|
||||
|
||||
close(fd);
|
||||
return 1;
|
||||
}
|
||||
|
||||
void write_int(char *path, int i)
|
||||
{
|
||||
char buf[1024];
|
||||
|
@ -42,7 +68,7 @@ void set_led(int on)
|
|||
|
||||
void protect(int seconds)
|
||||
{
|
||||
write_int("/sys/block/sda/device/unload_heads", seconds*1000);
|
||||
write_int(unload_heads_path, seconds*1000);
|
||||
}
|
||||
|
||||
int on_ac(void)
|
||||
|
@ -61,14 +87,27 @@ void ignore_me(void)
|
|||
set_led(0);
|
||||
}
|
||||
|
||||
int main(int argc, char *argv[])
|
||||
int main(int argc, char **argv)
|
||||
{
|
||||
int fd, ret;
|
||||
struct sched_param param;
|
||||
|
||||
if (argc == 1)
|
||||
ret = set_unload_heads_path("/dev/sda");
|
||||
else if (argc == 2)
|
||||
ret = set_unload_heads_path(argv[1]);
|
||||
else
|
||||
ret = -EINVAL;
|
||||
|
||||
if (ret || !valid_disk()) {
|
||||
fprintf(stderr, "usage: %s <device> (default: /dev/sda)\n",
|
||||
argv[0]);
|
||||
exit(1);
|
||||
}
|
||||
|
||||
fd = open("/dev/freefall", O_RDONLY);
|
||||
if (fd < 0) {
|
||||
perror("open");
|
||||
perror("/dev/freefall");
|
||||
return EXIT_FAILURE;
|
||||
}
|
||||
|
||||
|
|
Loading…
Reference in a new issue