Index: util-linux-ng-2.12r+2.13pre7/mount/mount_by_label.c
===================================================================
--- util-linux-ng-2.12r+2.13pre7.orig/mount/mount_by_label.c
+++ util-linux-ng-2.12r+2.13pre7/mount/mount_by_label.c
@@ -18,6 +18,8 @@
  * - Added JFS v2 format support
  * 2002-07-26 Luciano Chavez <lnx1138@us.ibm.com>
  * - Added EVMS support
+ * 2004-08-11 Alasdair Kergon <agk@redhat.com>
+ * - Added LVM2/device-mapper support
  */
 
 #include <stdio.h>
@@ -39,6 +41,7 @@
 #define VG_DIR          "/proc/lvm/VGs"
 #define EVMS_VOLUME_NAME_SIZE  127
 #define PROC_EVMS_VOLUMES "/proc/evms/volumes"
+#define DEVICEMAPPERDIR "/dev/mapper"
 
 extern char *progname;
 
@@ -104,6 +107,34 @@ uuidcache_init_lvm(void) {
 	closedir(vg_dir);
 }
 
+/* LVM2/device-mapper support */
+static void
+uuidcache_init_dm(void) {
+	char lvm_device[PATH_MAX];
+	DIR *d;
+	struct dirent *lv_iter;
+	char uuid[16], *label;
+
+	if (!(d = opendir(DEVICEMAPPERDIR))) {
+		if (errno != ENOENT)
+			perror("mount (init_dm)");
+		return;
+	}
+
+	while ((lv_iter = readdir(d))) {
+		if (!strcmp(lv_iter->d_name, "control") ||
+		    !strcmp(lv_iter->d_name, ".") ||
+		    !strcmp(lv_iter->d_name, ".."))
+			continue;
+		snprintf(lvm_device, sizeof(lvm_device), "%s/%s",
+			 DEVICEMAPPERDIR, lv_iter->d_name);
+		if (!get_label_uuid(strdup(lvm_device), &label, uuid))
+				uuidcache_addentry(strdup(lvm_device),
+						   label, uuid);
+	}
+	closedir(d);
+}
+
 static int
 uuidcache_init_evms(void) {
 	FILE *procvol;
@@ -256,6 +287,8 @@ uuidcache_init(void) {
 	fclose(procpt);
 
 	uuidcache_init_lvm();
+
+	uuidcache_init_dm();
 }
 
 #define UUID   1