[PATCH 3/3] btrfs: fix failure of tests that use defrag on btrfs-progs v6.0+

[fdmanana@kernel.org]

From: Filipe Manana <fdmanana@suse.com>

Starting with btrfs-progs v6.0, the defrag command now prints to stdout
the full path of the files it processes. This makes test cases btrfs/021
and btrfs/256 fail because they don't expect any output from the defrag
command.

The change happened with the following commit in btrfs-progs:

  dd724f21803d ("btrfs-progs: add logic to handle LOG_DEFAULT messages")

So update the tests to ignore the stdout of the defrag command.

Signed-off-by: Filipe Manana <fdmanana@suse.com>
---
 tests/btrfs/021 | 4 +++-
 tests/btrfs/256 | 4 +++-
 2 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/tests/btrfs/021 b/tests/btrfs/021
index 5943da2f..1b55834a 100755
--- a/tests/btrfs/021
+++ b/tests/btrfs/021
@@ -22,8 +22,10 @@ run_test()
 
 	sleep 0.5
 
+	# In new versions of btrfs-progs (6.0+), the defrag command outputs to
+	# stdout the path of the files it operates on. So ignore that.
 	find $SCRATCH_MNT -type f -print0 | xargs -0 \
-	$BTRFS_UTIL_PROG filesystem defrag -f
+		$BTRFS_UTIL_PROG filesystem defrag -f > /dev/null
 
 	sync
 	wait
diff --git a/tests/btrfs/256 b/tests/btrfs/256
index 1360c2c2..acbbc6fa 100755
--- a/tests/btrfs/256
+++ b/tests/btrfs/256
@@ -50,7 +50,9 @@ $FSSUM_PROG -A -f -w "$checksums_file" "$SCRATCH_MNT"
 # Now defrag each file.
 for sz in ${file_sizes[@]}; do
 	echo "Defragging file with $sz bytes..." >> $seqres.full
-	$BTRFS_UTIL_PROG filesystem defragment "$SCRATCH_MNT/f_$sz"
+	# In new versions of btrfs-progs (6.0+), the defrag command outputs to
+	# stdout the path of the files it operates on. So ignore that.
+	$BTRFS_UTIL_PROG filesystem defragment "$SCRATCH_MNT/f_$sz" > /dev/null
 done
 
 # Verify the checksums after the defrag operations.
-- 
2.35.1