btrfs-progs: tests: Move code to create loop device to common

This code block is used several tests, move it to ./common and add a
helper.

Signed-off-by: Zhao Lei <zhaolei@cn.fujitsu.com>
Signed-off-by: David Sterba <dsterba@suse.com>

5 files changed, 20 insertions, 40 deletions

diff --git a/tests/common b/tests/common
index 899ec7b1..2d337b0b 100644
--- a/tests/common
+++ b/tests/common
@@ -142,3 +142,19 @@ setup_root_helper()
 	fi
 	SUDO_HELPER=root_helper
 }
+
+prepare_test_dev()
+{
+	# num[K/M/G/T...]
+	local size="$1"
+
+	[[ "$TEST_DEV" ]] && return
+	[[ "$size" ]] || size='1G'
+
+	echo "\$TEST_DEV not given, use $TOP/test/test.img as fallback" >> \
+		$RESULTS
+	TEST_DEV="$TOP/tests/test.img"
+
+	truncate -s "$size" "$TEST_DEV" || _not_run "create file for loop device failed"
+}
+
diff --git a/tests/fsck-tests/013-extent-tree-rebuild/test.sh b/tests/fsck-tests/013-extent-tree-rebuild/test.sh
index 3290cd72..88a66cc2 100755
--- a/tests/fsck-tests/013-extent-tree-rebuild/test.sh
+++ b/tests/fsck-tests/013-extent-tree-rebuild/test.sh
@@ -5,16 +5,7 @@ source $TOP/tests/common
 check_prereq btrfs-debug-tree
 check_prereq mkfs.btrfs
 setup_root_helper
-
-if [ -z $TEST_DEV ]; then
-	echo "\$TEST_DEV not given, use $TOP/test/test.img as fallback" >> \
-		$RESULTS
-	TEST_DEV="$TOP/tests/test.img"
-
-	# Need at least 1G to avoid mixed block group, which extent tree
-	# rebuild doesn't support.
-	run_check truncate -s 1G $TEST_DEV
-fi
+prepare_test_dev 1G
 
 if [ -z $TEST_MNT ];then
 	echo "    [NOTRUN] extent tree rebuild, need TEST_MNT variant"
diff --git a/tests/misc-tests/001-btrfstune-features/test.sh b/tests/misc-tests/001-btrfstune-features/test.sh
index c9981e6e..ea33954d 100755
--- a/tests/misc-tests/001-btrfstune-features/test.sh
+++ b/tests/misc-tests/001-btrfstune-features/test.sh
@@ -7,16 +7,7 @@ check_prereq btrfs-debug-tree
 check_prereq btrfs-show-super
 check_prereq mkfs.btrfs
 setup_root_helper
-
-if [ -z $TEST_DEV ]; then
-	echo "\$TEST_DEV not given, use $TOP/test/test.img as fallback" >> \
-		$RESULTS
-	TEST_DEV="$TOP/tests/test.img"
-
-	# Need at least 1G to avoid mixed block group, which extent tree
-	# rebuild doesn't support.
-	run_check truncate -s 1G $TEST_DEV
-fi
+prepare_test_dev
 
 if [ -z $TEST_MNT ];then
 	echo "    [NOTRUN] extent tree rebuild, need TEST_MNT variant"
diff --git a/tests/misc-tests/002-uuid-rewrite/test.sh b/tests/misc-tests/002-uuid-rewrite/test.sh
index 6c2a3930..bffa9b85 100755
--- a/tests/misc-tests/002-uuid-rewrite/test.sh
+++ b/tests/misc-tests/002-uuid-rewrite/test.sh
@@ -7,16 +7,7 @@ check_prereq btrfs-debug-tree
 check_prereq btrfs-show-super
 check_prereq mkfs.btrfs
 check_prereq btrfstune
-
-if [ -z $TEST_DEV ]; then
-	echo "\$TEST_DEV not given, use $TOP/test/test.img as fallback" >> \
-		$RESULTS
-	TEST_DEV="$TOP/tests/test.img"
-
-	# Need at least 1G to avoid mixed block group, which extent tree
-	# rebuild doesn't support.
-	run_check truncate -s 1G $TEST_DEV
-fi
+prepare_test_dev
 
 if [ -z $TEST_MNT ];then
 	echo "    [NOTRUN] extent tree rebuild, need TEST_MNT variant"
diff --git a/tests/misc-tests/003-zero-log/test.sh b/tests/misc-tests/003-zero-log/test.sh
index da5b3510..edab5dbc 100755
--- a/tests/misc-tests/003-zero-log/test.sh
+++ b/tests/misc-tests/003-zero-log/test.sh
@@ -6,16 +6,7 @@ source $TOP/tests/common
 check_prereq btrfs-show-super
 check_prereq mkfs.btrfs
 check_prereq btrfs
-
-if [ -z $TEST_DEV ]; then
-	echo "\$TEST_DEV not given, use $TOP/test/test.img as fallback" >> \
-		$RESULTS
-	TEST_DEV="$TOP/tests/test.img"
-
-	# Need at least 1G to avoid mixed block group, which extent tree
-	# rebuild doesn't support.
-	run_check truncate -s 1G $TEST_DEV
-fi
+prepare_test_dev
 
 if [ -z $TEST_MNT ];then
 	echo "    [NOTRUN] extent tree rebuild, need TEST_MNT variant"