From 1ec2c4ed8eb9fec1584a9d68b322643699849dda Mon Sep 17 00:00:00 2001
From: Alexander Barton <alex@barton.de>
Date: Tue, 1 Oct 2013 01:54:46 +0200
Subject: [PATCH] btrfs-mksnapshot: detect default subvolume on "/"

---
 btrfs/mksnapshot/btrfs-mksnapshot | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/btrfs/mksnapshot/btrfs-mksnapshot b/btrfs/mksnapshot/btrfs-mksnapshot
index 59b8c56..4528981 100755
--- a/btrfs/mksnapshot/btrfs-mksnapshot
+++ b/btrfs/mksnapshot/btrfs-mksnapshot
@@ -67,6 +67,9 @@ VOLUME_NAME=`grep " btrfs " /etc/fstab \
 	| grep "subvol=" \
 	| grep " $VOLUME_PATH " \
 	| sed -r 's|.*subvol=([[:alnum:]]*).*|\1|'`
+if [ -z "$VOLUME_NAME" -a "$VOLUME_PATH" = "/" ]; then
+	VOLUME_NAME=`btrfs subvolume get-default / | cut -d' ' -f9`
+fi
 if [ -z "$VOLUME_NAME" ]; then
 	echo "$NAME: Failed to detect btrfs subvolume name for \"$VOLUME_PATH\"!"
 	exit 1
-- 
2.39.2