From 599aea272fcc70a5cc603918a2f7548db458a44c Mon Sep 17 00:00:00 2001
From: Alexander Barton <alex@barton.de>
Date: Sat, 27 Dec 2014 00:43:24 +0100
Subject: [PATCH] btrfs-mksnapshot: Enhance detection of btrfs filesystem name

---
 btrfs/mksnapshot/btrfs-mksnapshot | 15 +++++++++------
 1 file changed, 9 insertions(+), 6 deletions(-)

diff --git a/btrfs/mksnapshot/btrfs-mksnapshot b/btrfs/mksnapshot/btrfs-mksnapshot
index c4a4282..3386b47 100755
--- a/btrfs/mksnapshot/btrfs-mksnapshot
+++ b/btrfs/mksnapshot/btrfs-mksnapshot
@@ -49,12 +49,15 @@ done
 [ -z "$DRY_RUN" ] || echo "VOLUME_PATH=$VOLUME_PATH"
 
 # Detect btrfs filesystem
-FS_NAME=`grep " btrfs " /etc/fstab \
-	| grep "^LABEL=" \
-	| grep " $VOLUME_PATH " \
-	| cut -d'"' -f2 \
-	| cut -d'=' -f2- \
-	| cut -d' ' -f1`
+FS_NAME=`btrfs fi sh -m / 2>/dev/null | head -1 | cut -d"'" -f2`
+if [ -z "$FS_NAME" ]; then
+	FS_NAME=`grep " btrfs " /etc/fstab \
+		| grep "^LABEL=" \
+		| grep " $VOLUME_PATH " \
+		| cut -d'"' -f2 \
+		| cut -d'=' -f2- \
+		| cut -d' ' -f1`
+fi
 if [ -z "$FS_NAME" ]; then
 	echo "$NAME: Failed to detect btrfs filesystem label for \"$VOLUME_PATH\"!"
 	exit 1
-- 
2.39.2