--- src/hddown.c
+++ src/hddown.c	2007-06-05 14:37:50.248140535 +0200
@@ -18,6 +18,106 @@ char *v_hddown = "@(#)hddown.c  1.02  22
 #include <sys/ioctl.h>
 #include <linux/hdreg.h>
 
+#define USE_SYSFS
+#ifdef USE_SYSFS
+
+#include <limits.h>
+#include <errno.h>
+#define SYS_BLK		"/sys/block"
+#define DEV_BASE	"/dev"
+
+/*
+ *	Find all disks through /sys/block.
+ */
+static char *list_disks(DIR* blk)
+{
+	struct dirent *d;
+
+	while ((d = readdir(blk))) {
+		if (d->d_name[1] == 'd' && (d->d_name[0] == 'h' || d->d_name[0] == 's')) {
+			char buf[NAME_MAX+1];
+			int fd, ret;
+			FILE *fp;
+
+			ret = snprintf(buf, sizeof(buf), SYS_BLK "/%s/removable", d->d_name);
+			if ((ret >= sizeof(buf)) || (ret < 0))
+				goto empty;
+
+			fd = open(buf, O_RDONLY|O_NOCTTY);
+			if ((fd < 0) && (errno != ENOENT))
+				goto empty;
+
+			fp = fdopen(fd, "r");
+			if (fp == (FILE*)0) {
+				close(fd);
+				goto empty;
+			}
+
+			ret = getc(fp);
+			fclose(fp);
+
+			if (ret == '0') break;		/* found disk, out here */
+		}
+	}
+	if (d == (struct dirent*)0)
+		goto empty;
+	return d->d_name;
+empty:
+	return (char*)0;
+}
+
+/*
+ *	Put an disk in standby mode.
+ *	Code stolen from hdparm.c
+ */
+static int do_standby_idedisk(char *device)
+{
+#ifndef WIN_STANDBYNOW1
+#define WIN_STANDBYNOW1 0xE0
+#endif
+#ifndef WIN_STANDBYNOW2
+#define WIN_STANDBYNOW2 0x94
+#endif
+	unsigned char args1[4] = {WIN_STANDBYNOW1,0,0,0};
+	unsigned char args2[4] = {WIN_STANDBYNOW2,0,0,0};
+	char buf[NAME_MAX+1];
+	int fd, ret;
+
+	ret = snprintf(buf, sizeof(buf), DEV_BASE "/%s", device);
+	if ((ret >= sizeof(buf)) || (ret < 0))
+		return -1;
+
+	if ((fd = open(buf, O_RDWR)) < 0)
+		return -1;
+
+	ret = ioctl(fd, HDIO_DRIVE_CMD, &args1) &&
+	      ioctl(fd, HDIO_DRIVE_CMD, &args2);
+	close(fd);
+
+	if (ret)
+		return -1;
+	return 0;
+}
+
+/*
+ *	List all disks and put them in standby mode.
+ *	This has the side-effect of flushing the writecache,
+ *	which is exactly what we want on poweroff.
+ */
+int hddown(void)
+{
+	DIR *blk;
+	char *disk;
+
+	if ((blk = opendir(SYS_BLK)) == (DIR*)0)
+		return -1;
+
+	while ((disk = list_disks(blk)))
+		do_standby_idedisk(disk);
+
+	return closedir(blk);
+}
+#else /* ! USE_SYSFS */
 #define MAX_DISKS	64
 #define PROC_IDE	"/proc/ide"
 #define DEV_BASE	"/dev"
@@ -104,7 +204,7 @@ int hddown(void)
 
 	return 0;
 }
-
+#endif /* ! USE_SYSFS */
 #else /* __linux__ */
 
 int hddown(void)