174 lines
3.1 KiB
C
174 lines
3.1 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/* Disk protection for HP/DELL machines.
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*
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* Copyright 2008 Eric Piel
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* Copyright 2009 Pavel Machek <pavel@ucw.cz>
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* Copyright 2012 Sonal Santan
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* Copyright 2014 Pali Rohár <pali@kernel.org>
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <string.h>
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#include <stdint.h>
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#include <errno.h>
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#include <signal.h>
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#include <sys/mman.h>
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#include <sched.h>
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#include <syslog.h>
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static int noled;
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static char unload_heads_path[64];
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static char device_path[32];
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static const char app_name[] = "FREE FALL";
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static int set_unload_heads_path(char *device)
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{
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if (strlen(device) <= 5 || strncmp(device, "/dev/", 5) != 0)
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return -EINVAL;
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strncpy(device_path, device, sizeof(device_path) - 1);
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snprintf(unload_heads_path, sizeof(unload_heads_path) - 1,
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"/sys/block/%s/device/unload_heads", device+5);
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return 0;
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}
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static int valid_disk(void)
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{
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int fd = open(unload_heads_path, O_RDONLY);
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if (fd < 0) {
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perror(unload_heads_path);
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return 0;
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}
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close(fd);
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return 1;
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}
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static void write_int(char *path, int i)
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{
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char buf[1024];
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int fd = open(path, O_RDWR);
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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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sprintf(buf, "%d", i);
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if (write(fd, buf, strlen(buf)) != strlen(buf)) {
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perror("write");
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exit(1);
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}
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close(fd);
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}
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static void set_led(int on)
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{
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if (noled)
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return;
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write_int("/sys/class/leds/hp::hddprotect/brightness", on);
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}
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static void protect(int seconds)
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{
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const char *str = (seconds == 0) ? "Unparked" : "Parked";
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write_int(unload_heads_path, seconds*1000);
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syslog(LOG_INFO, "%s %s disk head\n", str, device_path);
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}
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static int on_ac(void)
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{
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/* /sys/class/power_supply/AC0/online */
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return 1;
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}
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static int lid_open(void)
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{
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/* /proc/acpi/button/lid/LID/state */
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return 1;
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}
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static void ignore_me(int signum)
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{
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protect(0);
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set_led(0);
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}
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int main(int argc, char **argv)
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{
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int fd, ret;
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struct stat st;
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struct sched_param param;
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if (argc == 1)
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ret = set_unload_heads_path("/dev/sda");
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else if (argc == 2)
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ret = set_unload_heads_path(argv[1]);
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else
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ret = -EINVAL;
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if (ret || !valid_disk()) {
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fprintf(stderr, "usage: %s <device> (default: /dev/sda)\n",
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argv[0]);
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exit(1);
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}
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fd = open("/dev/freefall", O_RDONLY);
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if (fd < 0) {
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perror("/dev/freefall");
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return EXIT_FAILURE;
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}
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if (stat("/sys/class/leds/hp::hddprotect/brightness", &st))
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noled = 1;
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if (daemon(0, 0) != 0) {
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perror("daemon");
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return EXIT_FAILURE;
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}
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openlog(app_name, LOG_CONS | LOG_PID | LOG_NDELAY, LOG_LOCAL1);
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param.sched_priority = sched_get_priority_max(SCHED_FIFO);
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sched_setscheduler(0, SCHED_FIFO, ¶m);
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mlockall(MCL_CURRENT|MCL_FUTURE);
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signal(SIGALRM, ignore_me);
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for (;;) {
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unsigned char count;
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ret = read(fd, &count, sizeof(count));
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alarm(0);
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if ((ret == -1) && (errno == EINTR)) {
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/* Alarm expired, time to unpark the heads */
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continue;
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}
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if (ret != sizeof(count)) {
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perror("read");
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break;
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}
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protect(21);
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set_led(1);
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if (1 || on_ac() || lid_open())
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alarm(2);
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else
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alarm(20);
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}
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closelog();
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close(fd);
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return EXIT_SUCCESS;
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}
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