Add btrfs support

sv.d/misc.in

@@ -69,6 +69,11 @@ kill_all(){
 
 case "$1" in
     start)
+        if [[ -x "/bin/btrfs" ]]; then
+            stat_busy "Activating btrfs devices"
+            btrfs device scan
+            stat_done
+        fi
         stat_busy "Checking filesystems"
         do_fsck
         add_daemon misc

sv.d/udev.in

@@ -5,10 +5,15 @@
 
 case "$1" in
     start)
-        stat_busy "Starting udev daemon"
+        # check if runit already runs udevd
-        udevd --daemon || stat_die udev
+        if ! pgrep -f "runsv udevd" >/dev/null 2>&1; then
-        add_daemon udev
+            stat_busy "Starting udev daemon"
-        stat_done udev
+            udevd --daemon || stat_die udev
+            # Note: This is only needed for initialization, udev will
+            #       be controlled by runit on stage 2.
+            add_daemon udev
+            stat_done udev
+        fi
         ;;
     stop)
         stat_busy "Stopping udev"