From 902223bdbbf298e8860e9f2ec6b831eb5d62cee0 Mon Sep 17 00:00:00 2001
From: Theodore Ts'o <tytso@mit.edu>
Date: Mon, 29 Feb 2016 10:18:17 +1100
Subject: [PATCH] defrag: require extents support for ext4 defrag

The e4defrag program requires the use of fallocate, which in turn
means that the file system must have extents.  Enforce this
requirement so we don't get test failure noise when testing ext4's
ext3 compatibility.

Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Dave Chinner <david@fromorbit.com>
---
 common/defrag | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/common/defrag b/common/defrag
index 942593e1..6fbf8304 100644
--- a/common/defrag
+++ b/common/defrag
@@ -27,7 +27,9 @@ _require_defrag()
         DEFRAG_PROG="$XFS_FSR_PROG"
 	;;
     ext4|ext4dev)
-        DEFRAG_PROG="$E4DEFRAG_PROG"
+	DEFRAG_PROG="$E4DEFRAG_PROG"
+	dumpe2fs -h $SCRATCH_DEV 2> /dev/null | grep -wq extent || \
+	     _notrun "file system does not have extents, needed for defrag"
 	;;
     btrfs)
 	DEFRAG_PROG="$BTRFS_UTIL_PROG filesystem defragment"
-- 
2.39.5