174 lines
3.1 KiB
C
174 lines
3.1 KiB
C
/* Disk protection for HP/DELL machines.
|
|
*
|
|
* Copyright 2008 Eric Piel
|
|
* Copyright 2009 Pavel Machek <pavel@ucw.cz>
|
|
* Copyright 2012 Sonal Santan
|
|
* Copyright 2014 Pali Rohár <pali.rohar@gmail.com>
|
|
*
|
|
* GPLv2.
|
|
*/
|
|
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <unistd.h>
|
|
#include <fcntl.h>
|
|
#include <sys/stat.h>
|
|
#include <sys/types.h>
|
|
#include <string.h>
|
|
#include <stdint.h>
|
|
#include <errno.h>
|
|
#include <signal.h>
|
|
#include <sys/mman.h>
|
|
#include <sched.h>
|
|
#include <syslog.h>
|
|
|
|
static int noled;
|
|
static char unload_heads_path[64];
|
|
static char device_path[32];
|
|
static const char app_name[] = "FREE FALL";
|
|
|
|
static int set_unload_heads_path(char *device)
|
|
{
|
|
if (strlen(device) <= 5 || strncmp(device, "/dev/", 5) != 0)
|
|
return -EINVAL;
|
|
strncpy(device_path, device, sizeof(device_path) - 1);
|
|
|
|
snprintf(unload_heads_path, sizeof(unload_heads_path) - 1,
|
|
"/sys/block/%s/device/unload_heads", device+5);
|
|
return 0;
|
|
}
|
|
|
|
static 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;
|
|
}
|
|
|
|
static void write_int(char *path, int i)
|
|
{
|
|
char buf[1024];
|
|
int fd = open(path, O_RDWR);
|
|
|
|
if (fd < 0) {
|
|
perror("open");
|
|
exit(1);
|
|
}
|
|
|
|
sprintf(buf, "%d", i);
|
|
|
|
if (write(fd, buf, strlen(buf)) != strlen(buf)) {
|
|
perror("write");
|
|
exit(1);
|
|
}
|
|
|
|
close(fd);
|
|
}
|
|
|
|
static void set_led(int on)
|
|
{
|
|
if (noled)
|
|
return;
|
|
write_int("/sys/class/leds/hp::hddprotect/brightness", on);
|
|
}
|
|
|
|
static void protect(int seconds)
|
|
{
|
|
const char *str = (seconds == 0) ? "Unparked" : "Parked";
|
|
|
|
write_int(unload_heads_path, seconds*1000);
|
|
syslog(LOG_INFO, "%s %s disk head\n", str, device_path);
|
|
}
|
|
|
|
static int on_ac(void)
|
|
{
|
|
/* /sys/class/power_supply/AC0/online */
|
|
return 1;
|
|
}
|
|
|
|
static int lid_open(void)
|
|
{
|
|
/* /proc/acpi/button/lid/LID/state */
|
|
return 1;
|
|
}
|
|
|
|
static void ignore_me(int signum)
|
|
{
|
|
protect(0);
|
|
set_led(0);
|
|
}
|
|
|
|
int main(int argc, char **argv)
|
|
{
|
|
int fd, ret;
|
|
struct stat st;
|
|
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("/dev/freefall");
|
|
return EXIT_FAILURE;
|
|
}
|
|
|
|
if (stat("/sys/class/leds/hp::hddprotect/brightness", &st))
|
|
noled = 1;
|
|
|
|
if (daemon(0, 0) != 0) {
|
|
perror("daemon");
|
|
return EXIT_FAILURE;
|
|
}
|
|
|
|
openlog(app_name, LOG_CONS | LOG_PID | LOG_NDELAY, LOG_LOCAL1);
|
|
|
|
param.sched_priority = sched_get_priority_max(SCHED_FIFO);
|
|
sched_setscheduler(0, SCHED_FIFO, ¶m);
|
|
mlockall(MCL_CURRENT|MCL_FUTURE);
|
|
|
|
signal(SIGALRM, ignore_me);
|
|
|
|
for (;;) {
|
|
unsigned char count;
|
|
|
|
ret = read(fd, &count, sizeof(count));
|
|
alarm(0);
|
|
if ((ret == -1) && (errno == EINTR)) {
|
|
/* Alarm expired, time to unpark the heads */
|
|
continue;
|
|
}
|
|
|
|
if (ret != sizeof(count)) {
|
|
perror("read");
|
|
break;
|
|
}
|
|
|
|
protect(21);
|
|
set_led(1);
|
|
if (1 || on_ac() || lid_open())
|
|
alarm(2);
|
|
else
|
|
alarm(20);
|
|
}
|
|
|
|
closelog();
|
|
close(fd);
|
|
return EXIT_SUCCESS;
|
|
}
|