[PATCH v4 3/4] btrfs-progs: test/common: Enhance prepare_test_dev to reset device size

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So prepare_test_dev() can be called several times in one test case, to
test different device sizes.

Signed-off-by: Qu Wenruo <wqu@xxxxxxxx>
---
 tests/common | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/tests/common b/tests/common
index 977bade201a6..63750dbfeffe 100644
--- a/tests/common
+++ b/tests/common
@@ -441,8 +441,12 @@ prepare_test_dev()
 	# num[K/M/G/T...]
 	local size="$1"
 
-	[[ "$TEST_DEV" ]] && return
 	[[ "$size" ]] || size='2G'
+	# Still truncate it to new size
+	if [[ "$TEST_DEV" ]]; then
+		truncate -s "$size" "$TEST_DEV"
+		return;
+	fi
 
 	echo "\$TEST_DEV not given, use $TOP/test/test.img as fallback" >> \
 		"$RESULTS"
-- 
2.14.3

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