--- 10_archlinux.pristine	2014-01-29 01:46:35.000000000 +0700
+++ 10_archlinux.patched	2014-01-29 01:58:57.000000000 +0700
@@ -90,6 +90,14 @@
 
 [[ "${GRUB_LINUX_PARAMS}" == "" ]] && GRUB_LINUX_PARAMS="${GRUB_CMDLINE_LINUX} ${GRUB_CMDLINE_LINUX_DEFAULT}"
 
+if [ $GRUB_FS == "btrfs" ]; then
+    rootsubvol="`make_system_path_relative_to_its_root /`"
+    rootsubvol="${rootsubvol#/}"
+    if [ "x${rootsubvol}" != x ]; then
+        GRUB_LINUX_PARAMS="rootflags=subvol=${rootsubvol} ${GRUB_LINUX_PARAMS}"
+    fi
+fi
+
 for _KERNEL_ in ${list} ; do
     
     echo "Found linux image: ${_KERNEL_}" >&2