[PATCH 6/7] iotests/common.rc: add disk_usage function

[Andrey Drobyshev <andrey.drobyshev@virtuozzo.com>]

Move the definition from iotests/250 to common.rc.  This is used to
detect real disk usage of sparse files.  In particular, we want to use
it for checking subclusters-based discards.

Signed-off-by: Andrey Drobyshev <andrey.drobyshev@virtuozzo.com>
---
 tests/qemu-iotests/250       | 5 -----
 tests/qemu-iotests/common.rc | 6 ++++++
 2 files changed, 6 insertions(+), 5 deletions(-)

diff --git a/tests/qemu-iotests/250 b/tests/qemu-iotests/250
index af48f83aba..c0a0dbc0ff 100755
--- a/tests/qemu-iotests/250
+++ b/tests/qemu-iotests/250
@@ -52,11 +52,6 @@ _unsupported_imgopts data_file
 # bdrv_co_truncate(bs->file) call in qcow2_co_truncate(), which might succeed
 # anyway.
 
-disk_usage()
-{
-    du --block-size=1 $1 | awk '{print $1}'
-}
-
 size=2100M
 
 _make_test_img -o "cluster_size=1M,preallocation=metadata" $size
diff --git a/tests/qemu-iotests/common.rc b/tests/qemu-iotests/common.rc
index 95c12577dd..5d2ea26c7f 100644
--- a/tests/qemu-iotests/common.rc
+++ b/tests/qemu-iotests/common.rc
@@ -140,6 +140,12 @@ _optstr_add()
     fi
 }
 
+# report real disk usage for sparse files
+disk_usage()
+{
+    du --block-size=1 $1 | awk '{print $1}'
+}
+
 # Set the variables to the empty string to turn Valgrind off
 # for specific processes, e.g.
 # $ VALGRIND_QEMU_IO= ./check -qcow2 -valgrind 015
-- 
2.39.3