diff --git a/tests/qemu-iotests/013.out b/tests/qemu-iotests/013.out
index 3073e3f..0d57187 100644
--- a/tests/qemu-iotests/013.out
+++ b/tests/qemu-iotests/013.out
@@ -1,5 +1,5 @@
 QA output created by 013
-Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=6442450944 cluster_size=4096 
+Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=6442450944 
 Testing empty image
 
 At offset 0:
diff --git a/tests/qemu-iotests/014.out b/tests/qemu-iotests/014.out
index 8045613..0258d75 100644
--- a/tests/qemu-iotests/014.out
+++ b/tests/qemu-iotests/014.out
@@ -1,5 +1,5 @@
 QA output created by 014
-Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=6442450944 cluster_size=4096 
+Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=6442450944 
 Testing empty image:
 test2: With offset 0
 === Clusters to be compressed [1]
diff --git a/tests/qemu-iotests/015.out b/tests/qemu-iotests/015.out
index 3ba723d..d4b961c 100644
--- a/tests/qemu-iotests/015.out
+++ b/tests/qemu-iotests/015.out
@@ -1,7 +1,7 @@
 QA output created by 015
 
 creating image
-Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=37748736 cluster_size=1024 
+Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=37748736 
 creating first snapshot
 wrote 37748736/37748736 bytes at offset 0
 36 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
diff --git a/tests/qemu-iotests/019.out b/tests/qemu-iotests/019.out
index 241d30c..b51224b 100644
--- a/tests/qemu-iotests/019.out
+++ b/tests/qemu-iotests/019.out
@@ -1,5 +1,5 @@
 QA output created by 019
-Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=6442450944 cluster_size=65536 
+Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=6442450944 
 Filling base image
 
 === IO: pattern 42
@@ -269,7 +269,7 @@ qemu-io> wrote 65536/65536 bytes at offset 4296015872
 qemu-io> No errors were found on the image.
 Creating test image with backing file
 
-Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=6442450944 backing_file='TEST_DIR/t.IMGFMT.base' cluster_size=65536 
+Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=6442450944 backing_file='TEST_DIR/t.IMGFMT.base' 
 Filling test image
 
 === IO: pattern 43
diff --git a/tests/qemu-iotests/022.out b/tests/qemu-iotests/022.out
index b900c71..aed86d5 100644
--- a/tests/qemu-iotests/022.out
+++ b/tests/qemu-iotests/022.out
@@ -1,5 +1,5 @@
 QA output created by 022
-Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=6442450944 cluster_size=4096 
+Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=6442450944 
 Testing empty image
 
 At offset 10485760:
diff --git a/tests/qemu-iotests/023.out b/tests/qemu-iotests/023.out
index 138434e..8a7c5b2 100644
--- a/tests/qemu-iotests/023.out
+++ b/tests/qemu-iotests/023.out
@@ -1,7 +1,7 @@
 QA output created by 023
 Creating new image; cluster size: 1024
 
-Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=8589934592 cluster_size=1024 
+Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=8589934592 
 Testing empty image
 
 At offset 0:
@@ -5664,7 +5664,7 @@ qemu-io> read 3072/3072 bytes at offset 4295491072
 qemu-io> No errors were found on the image.
 Creating another new image
 
-Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=8589934592 cluster_size=1024 
+Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=8589934592 
 More complex patterns
 
 test2: With offset 0
@@ -5887,7 +5887,7 @@ qemu-io> read 2048/2048 bytes at offset 4295001088
 qemu-io> No errors were found on the image.
 Creating new image; cluster size: 4096
 
-Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=8589934592 cluster_size=4096 
+Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=8589934592 
 Testing empty image
 
 At offset 0:
@@ -12270,7 +12270,7 @@ qemu-io> read 12288/12288 bytes at offset 4301256704
 qemu-io> No errors were found on the image.
 Creating another new image
 
-Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=8589934592 cluster_size=4096 
+Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=8589934592 
 More complex patterns
 
 test2: With offset 0
@@ -12493,7 +12493,7 @@ qemu-io> read 8192/8192 bytes at offset 4295102464
 qemu-io> No errors were found on the image.
 Creating new image; cluster size: 16384
 
-Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=8589934592 cluster_size=16384 
+Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=8589934592 
 Testing empty image
 
 At offset 0:
@@ -18876,7 +18876,7 @@ qemu-io> read 49152/49152 bytes at offset 4395622400
 qemu-io> No errors were found on the image.
 Creating another new image
 
-Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=8589934592 cluster_size=16384 
+Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=8589934592 
 More complex patterns
 
 test2: With offset 0
@@ -19099,7 +19099,7 @@ qemu-io> read 32768/32768 bytes at offset 4295507968
 qemu-io> No errors were found on the image.
 Creating new image; cluster size: 65536
 
-Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=8589934592 cluster_size=65536 
+Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=8589934592 
 Testing empty image
 
 At offset 0:
@@ -25482,7 +25482,7 @@ qemu-io> read 196608/196608 bytes at offset 5905547264
 qemu-io> No errors were found on the image.
 Creating another new image
 
-Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=8589934592 cluster_size=65536 
+Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=8589934592 
 More complex patterns
 
 test2: With offset 0
diff --git a/tests/qemu-iotests/024.out b/tests/qemu-iotests/024.out
index 4cee216..072207c 100644
--- a/tests/qemu-iotests/024.out
+++ b/tests/qemu-iotests/024.out
@@ -1,7 +1,7 @@
 QA output created by 024
 Creating backing file
 
-Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 cluster_size=65536 
+Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 
 === IO: pattern 0x11
 qemu-io> wrote 65536/65536 bytes at offset 0
 64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
@@ -21,7 +21,7 @@ qemu-io> wrote 65536/65536 bytes at offset 917504
 64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
 qemu-io> Creating new backing file
 
-Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 cluster_size=65536 
+Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 
 === IO: pattern 0x22
 qemu-io> wrote 131072/131072 bytes at offset 0
 128 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
@@ -33,7 +33,7 @@ qemu-io> wrote 131072/131072 bytes at offset 786432
 128 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
 qemu-io> Creating COW image
 
-Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 backing_file='TEST_DIR/t.IMGFMT.base_old' cluster_size=65536 
+Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 backing_file='TEST_DIR/t.IMGFMT.base_old' 
 === IO: pattern 0x33
 qemu-io> wrote 262144/262144 bytes at offset 0
 256 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
diff --git a/tests/qemu-iotests/026.out b/tests/qemu-iotests/026.out
index b503cf2..fb4f20e 100644
--- a/tests/qemu-iotests/026.out
+++ b/tests/qemu-iotests/026.out
@@ -1,63 +1,63 @@
 QA output created by 026
 Errors while writing 128 kB
 
-Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 cluster_size=1024 
+Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 
 
 Event: l1_update; errno: 5; imm: off; once: on; write 
 write failed: Input/output error
 
 1 leaked clusters were found on the image.
 This means waste of disk space, but no harm to data.
-Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 cluster_size=1024 
+Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 
 
 Event: l1_update; errno: 5; imm: off; once: on; write -b
 write failed: Input/output error
 
 1 leaked clusters were found on the image.
 This means waste of disk space, but no harm to data.
-Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 cluster_size=1024 
+Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 
 
 Event: l1_update; errno: 5; imm: off; once: off; write 
 write failed: Input/output error
 
 1 leaked clusters were found on the image.
 This means waste of disk space, but no harm to data.
-Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 cluster_size=1024 
+Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 
 
 Event: l1_update; errno: 5; imm: off; once: off; write -b
 write failed: Input/output error
 
 1 leaked clusters were found on the image.
 This means waste of disk space, but no harm to data.
-Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 cluster_size=1024 
+Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 
 
 Event: l1_update; errno: 28; imm: off; once: on; write 
 write failed: No space left on device
 
 1 leaked clusters were found on the image.
 This means waste of disk space, but no harm to data.
-Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 cluster_size=1024 
+Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 
 
 Event: l1_update; errno: 28; imm: off; once: on; write -b
 write failed: No space left on device
 
 1 leaked clusters were found on the image.
 This means waste of disk space, but no harm to data.
-Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 cluster_size=1024 
+Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 
 
 Event: l1_update; errno: 28; imm: off; once: off; write 
 write failed: No space left on device
 
 1 leaked clusters were found on the image.
 This means waste of disk space, but no harm to data.
-Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 cluster_size=1024 
+Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 
 
 Event: l1_update; errno: 28; imm: off; once: off; write -b
 write failed: No space left on device
 
 1 leaked clusters were found on the image.
 This means waste of disk space, but no harm to data.
-Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 cluster_size=1024 
+Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 
 
 Event: l2_load; errno: 5; imm: off; once: on; write 
 wrote 131072/131072 bytes at offset 0
@@ -65,7 +65,7 @@ wrote 131072/131072 bytes at offset 0
 write failed: Input/output error
 read failed: Input/output error
 No errors were found on the image.
-Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 cluster_size=1024 
+Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 
 
 Event: l2_load; errno: 5; imm: off; once: on; write -b
 wrote 131072/131072 bytes at offset 0
@@ -73,7 +73,7 @@ wrote 131072/131072 bytes at offset 0
 write failed: Input/output error
 read failed: Input/output error
 No errors were found on the image.
-Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 cluster_size=1024 
+Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 
 
 Event: l2_load; errno: 5; imm: off; once: off; write 
 wrote 131072/131072 bytes at offset 0
@@ -81,7 +81,7 @@ wrote 131072/131072 bytes at offset 0
 write failed: Input/output error
 read failed: Input/output error
 No errors were found on the image.
-Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 cluster_size=1024 
+Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 
 
 Event: l2_load; errno: 5; imm: off; once: off; write -b
 wrote 131072/131072 bytes at offset 0
@@ -89,7 +89,7 @@ wrote 131072/131072 bytes at offset 0
 write failed: Input/output error
 read failed: Input/output error
 No errors were found on the image.
-Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 cluster_size=1024 
+Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 
 
 Event: l2_load; errno: 28; imm: off; once: on; write 
 wrote 131072/131072 bytes at offset 0
@@ -97,7 +97,7 @@ wrote 131072/131072 bytes at offset 0
 write failed: No space left on device
 read failed: No space left on device
 No errors were found on the image.
-Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 cluster_size=1024 
+Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 
 
 Event: l2_load; errno: 28; imm: off; once: on; write -b
 wrote 131072/131072 bytes at offset 0
@@ -105,7 +105,7 @@ wrote 131072/131072 bytes at offset 0
 write failed: No space left on device
 read failed: No space left on device
 No errors were found on the image.
-Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 cluster_size=1024 
+Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 
 
 Event: l2_load; errno: 28; imm: off; once: off; write 
 wrote 131072/131072 bytes at offset 0
@@ -113,7 +113,7 @@ wrote 131072/131072 bytes at offset 0
 write failed: No space left on device
 read failed: No space left on device
 No errors were found on the image.
-Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 cluster_size=1024 
+Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 
 
 Event: l2_load; errno: 28; imm: off; once: off; write -b
 wrote 131072/131072 bytes at offset 0
@@ -121,306 +121,306 @@ wrote 131072/131072 bytes at offset 0
 write failed: No space left on device
 read failed: No space left on device
 No errors were found on the image.
-Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 cluster_size=1024 
+Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 
 
 Event: l2_update; errno: 5; imm: off; once: on; write 
 write failed: Input/output error
 
 128 leaked clusters were found on the image.
 This means waste of disk space, but no harm to data.
-Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 cluster_size=1024 
+Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 
 
 Event: l2_update; errno: 5; imm: off; once: on; write -b
 write failed: Input/output error
 
 128 leaked clusters were found on the image.
 This means waste of disk space, but no harm to data.
-Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 cluster_size=1024 
+Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 
 
 Event: l2_update; errno: 5; imm: off; once: off; write 
 write failed: Input/output error
 
 128 leaked clusters were found on the image.
 This means waste of disk space, but no harm to data.
-Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 cluster_size=1024 
+Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 
 
 Event: l2_update; errno: 5; imm: off; once: off; write -b
 write failed: Input/output error
 
 128 leaked clusters were found on the image.
 This means waste of disk space, but no harm to data.
-Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 cluster_size=1024 
+Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 
 
 Event: l2_update; errno: 28; imm: off; once: on; write 
 write failed: No space left on device
 
 128 leaked clusters were found on the image.
 This means waste of disk space, but no harm to data.
-Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 cluster_size=1024 
+Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 
 
 Event: l2_update; errno: 28; imm: off; once: on; write -b
 write failed: No space left on device
 
 128 leaked clusters were found on the image.
 This means waste of disk space, but no harm to data.
-Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 cluster_size=1024 
+Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 
 
 Event: l2_update; errno: 28; imm: off; once: off; write 
 write failed: No space left on device
 
 128 leaked clusters were found on the image.
 This means waste of disk space, but no harm to data.
-Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 cluster_size=1024 
+Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 
 
 Event: l2_update; errno: 28; imm: off; once: off; write -b
 write failed: No space left on device
 
 128 leaked clusters were found on the image.
 This means waste of disk space, but no harm to data.
-Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 cluster_size=1024 
+Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 
 
 Event: l2_alloc.write; errno: 5; imm: off; once: on; write 
 write failed: Input/output error
 No errors were found on the image.
-Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 cluster_size=1024 
+Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 
 
 Event: l2_alloc.write; errno: 5; imm: off; once: on; write -b
 write failed: Input/output error
 
 1 leaked clusters were found on the image.
 This means waste of disk space, but no harm to data.
-Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 cluster_size=1024 
+Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 
 
 Event: l2_alloc.write; errno: 5; imm: off; once: off; write 
 write failed: Input/output error
 No errors were found on the image.
-Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 cluster_size=1024 
+Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 
 
 Event: l2_alloc.write; errno: 5; imm: off; once: off; write -b
 write failed: Input/output error
 
 1 leaked clusters were found on the image.
 This means waste of disk space, but no harm to data.
-Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 cluster_size=1024 
+Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 
 
 Event: l2_alloc.write; errno: 28; imm: off; once: on; write 
 write failed: No space left on device
 No errors were found on the image.
-Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 cluster_size=1024 
+Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 
 
 Event: l2_alloc.write; errno: 28; imm: off; once: on; write -b
 write failed: No space left on device
 
 1 leaked clusters were found on the image.
 This means waste of disk space, but no harm to data.
-Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 cluster_size=1024 
+Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 
 
 Event: l2_alloc.write; errno: 28; imm: off; once: off; write 
 write failed: No space left on device
 No errors were found on the image.
-Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 cluster_size=1024 
+Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 
 
 Event: l2_alloc.write; errno: 28; imm: off; once: off; write -b
 write failed: No space left on device
 
 1 leaked clusters were found on the image.
 This means waste of disk space, but no harm to data.
-Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 cluster_size=1024 
+Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 
 
 Event: write_aio; errno: 5; imm: off; once: on; write 
 write failed: Input/output error
 No errors were found on the image.
-Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 cluster_size=1024 
+Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 
 
 Event: write_aio; errno: 5; imm: off; once: on; write -b
 write failed: Input/output error
 No errors were found on the image.
-Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 cluster_size=1024 
+Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 
 
 Event: write_aio; errno: 5; imm: off; once: off; write 
 write failed: Input/output error
 No errors were found on the image.
-Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 cluster_size=1024 
+Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 
 
 Event: write_aio; errno: 5; imm: off; once: off; write -b
 write failed: Input/output error
 No errors were found on the image.
-Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 cluster_size=1024 
+Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 
 
 Event: write_aio; errno: 28; imm: off; once: on; write 
 write failed: No space left on device
 No errors were found on the image.
-Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 cluster_size=1024 
+Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 
 
 Event: write_aio; errno: 28; imm: off; once: on; write -b
 write failed: No space left on device
 No errors were found on the image.
-Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 cluster_size=1024 
+Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 
 
 Event: write_aio; errno: 28; imm: off; once: off; write 
 write failed: No space left on device
 No errors were found on the image.
-Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 cluster_size=1024 
+Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 
 
 Event: write_aio; errno: 28; imm: off; once: off; write -b
 write failed: No space left on device
 No errors were found on the image.
-Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 cluster_size=1024 
+Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 
 
 Event: refblock_load; errno: 5; imm: off; once: on; write 
 write failed: Input/output error
 No errors were found on the image.
-Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 cluster_size=1024 
+Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 
 
 Event: refblock_load; errno: 5; imm: off; once: on; write -b
 write failed: Input/output error
 No errors were found on the image.
-Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 cluster_size=1024 
+Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 
 
 Event: refblock_load; errno: 5; imm: off; once: off; write 
 write failed: Input/output error
 No errors were found on the image.
-Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 cluster_size=1024 
+Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 
 
 Event: refblock_load; errno: 5; imm: off; once: off; write -b
 write failed: Input/output error
 No errors were found on the image.
-Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 cluster_size=1024 
+Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 
 
 Event: refblock_load; errno: 28; imm: off; once: on; write 
 write failed: No space left on device
 No errors were found on the image.
-Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 cluster_size=1024 
+Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 
 
 Event: refblock_load; errno: 28; imm: off; once: on; write -b
 write failed: No space left on device
 No errors were found on the image.
-Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 cluster_size=1024 
+Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 
 
 Event: refblock_load; errno: 28; imm: off; once: off; write 
 write failed: No space left on device
 No errors were found on the image.
-Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 cluster_size=1024 
+Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 
 
 Event: refblock_load; errno: 28; imm: off; once: off; write -b
 write failed: No space left on device
 No errors were found on the image.
-Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 cluster_size=1024 
+Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 
 
 Event: refblock_update_part; errno: 5; imm: off; once: on; write 
 write failed: Input/output error
 No errors were found on the image.
-Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 cluster_size=1024 
+Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 
 
 Event: refblock_update_part; errno: 5; imm: off; once: on; write -b
 write failed: Input/output error
 No errors were found on the image.
-Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 cluster_size=1024 
+Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 
 
 Event: refblock_update_part; errno: 5; imm: off; once: off; write 
 write failed: Input/output error
 No errors were found on the image.
-Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 cluster_size=1024 
+Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 
 
 Event: refblock_update_part; errno: 5; imm: off; once: off; write -b
 write failed: Input/output error
 No errors were found on the image.
-Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 cluster_size=1024 
+Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 
 
 Event: refblock_update_part; errno: 28; imm: off; once: on; write 
 write failed: No space left on device
 No errors were found on the image.
-Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 cluster_size=1024 
+Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 
 
 Event: refblock_update_part; errno: 28; imm: off; once: on; write -b
 write failed: No space left on device
 No errors were found on the image.
-Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 cluster_size=1024 
+Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 
 
 Event: refblock_update_part; errno: 28; imm: off; once: off; write 
 write failed: No space left on device
 No errors were found on the image.
-Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 cluster_size=1024 
+Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 
 
 Event: refblock_update_part; errno: 28; imm: off; once: off; write -b
 write failed: No space left on device
 No errors were found on the image.
-Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 cluster_size=1024 
+Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 
 
 Event: refblock_alloc; errno: 5; imm: off; once: on; write 
 write failed: Input/output error
 No errors were found on the image.
-Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 cluster_size=1024 
+Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 
 
 Event: refblock_alloc; errno: 5; imm: off; once: on; write -b
 write failed: Input/output error
 No errors were found on the image.
-Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 cluster_size=1024 
+Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 
 
 Event: refblock_alloc; errno: 5; imm: off; once: off; write 
 write failed: Input/output error
 No errors were found on the image.
-Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 cluster_size=1024 
+Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 
 
 Event: refblock_alloc; errno: 5; imm: off; once: off; write -b
 write failed: Input/output error
 No errors were found on the image.
-Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 cluster_size=1024 
+Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 
 
 Event: refblock_alloc; errno: 28; imm: off; once: on; write 
 write failed: No space left on device
 No errors were found on the image.
-Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 cluster_size=1024 
+Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 
 
 Event: refblock_alloc; errno: 28; imm: off; once: on; write -b
 write failed: No space left on device
 No errors were found on the image.
-Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 cluster_size=1024 
+Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 
 
 Event: refblock_alloc; errno: 28; imm: off; once: off; write 
 write failed: No space left on device
 No errors were found on the image.
-Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 cluster_size=1024 
+Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 
 
 Event: refblock_alloc; errno: 28; imm: off; once: off; write -b
 write failed: No space left on device
 No errors were found on the image.
-Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 cluster_size=1024 
+Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 
 
 Event: cluster_alloc; errno: 5; imm: off; once: on; write 
 write failed: Input/output error
 No errors were found on the image.
-Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 cluster_size=1024 
+Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 
 
 Event: cluster_alloc; errno: 5; imm: off; once: on; write -b
 write failed: Input/output error
 No errors were found on the image.
-Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 cluster_size=1024 
+Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 
 
 Event: cluster_alloc; errno: 5; imm: off; once: off; write 
 write failed: Input/output error
 No errors were found on the image.
-Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 cluster_size=1024 
+Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 
 
 Event: cluster_alloc; errno: 5; imm: off; once: off; write -b
 write failed: Input/output error
 No errors were found on the image.
-Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 cluster_size=1024 
+Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 
 
 Event: cluster_alloc; errno: 28; imm: off; once: on; write 
 write failed: No space left on device
 No errors were found on the image.
-Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 cluster_size=1024 
+Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 
 
 Event: cluster_alloc; errno: 28; imm: off; once: on; write -b
 write failed: No space left on device
 No errors were found on the image.
-Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 cluster_size=1024 
+Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 
 
 Event: cluster_alloc; errno: 28; imm: off; once: off; write 
 write failed: No space left on device
 No errors were found on the image.
-Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 cluster_size=1024 
+Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 
 
 Event: cluster_alloc; errno: 28; imm: off; once: off; write -b
 write failed: No space left on device
@@ -428,116 +428,116 @@ No errors were found on the image.
 
 === Refcout table growth tests ===
 
-Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 cluster_size=512 
+Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 
 
 Event: refblock_alloc.hookup; errno: 28; imm: off; once: on; write 
 write failed: No space left on device
 No errors were found on the image.
-Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 cluster_size=512 
+Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 
 
 Event: refblock_alloc.hookup; errno: 28; imm: off; once: on; write -b
 write failed: No space left on device
 No errors were found on the image.
-Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 cluster_size=512 
+Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 
 
 Event: refblock_alloc.hookup; errno: 28; imm: off; once: off; write 
 write failed: No space left on device
 
 55 leaked clusters were found on the image.
 This means waste of disk space, but no harm to data.
-Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 cluster_size=512 
+Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 
 
 Event: refblock_alloc.hookup; errno: 28; imm: off; once: off; write -b
 write failed: No space left on device
 
 251 leaked clusters were found on the image.
 This means waste of disk space, but no harm to data.
-Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 cluster_size=512 
+Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 
 
 Event: refblock_alloc.write; errno: 28; imm: off; once: on; write 
 write failed: No space left on device
 No errors were found on the image.
-Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 cluster_size=512 
+Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 
 
 Event: refblock_alloc.write; errno: 28; imm: off; once: on; write -b
 write failed: No space left on device
 No errors were found on the image.
-Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 cluster_size=512 
+Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 
 
 Event: refblock_alloc.write; errno: 28; imm: off; once: off; write 
 write failed: No space left on device
 No errors were found on the image.
-Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 cluster_size=512 
+Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 
 
 Event: refblock_alloc.write; errno: 28; imm: off; once: off; write -b
 write failed: No space left on device
 No errors were found on the image.
-Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 cluster_size=512 
+Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 
 
 Event: refblock_alloc.write_blocks; errno: 28; imm: off; once: on; write 
 write failed: No space left on device
 No errors were found on the image.
-Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 cluster_size=512 
+Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 
 
 Event: refblock_alloc.write_blocks; errno: 28; imm: off; once: on; write -b
 write failed: No space left on device
 No errors were found on the image.
-Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 cluster_size=512 
+Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 
 
 Event: refblock_alloc.write_blocks; errno: 28; imm: off; once: off; write 
 write failed: No space left on device
 
 10 leaked clusters were found on the image.
 This means waste of disk space, but no harm to data.
-Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 cluster_size=512 
+Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 
 
 Event: refblock_alloc.write_blocks; errno: 28; imm: off; once: off; write -b
 write failed: No space left on device
 
 23 leaked clusters were found on the image.
 This means waste of disk space, but no harm to data.
-Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 cluster_size=512 
+Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 
 
 Event: refblock_alloc.write_table; errno: 28; imm: off; once: on; write 
 write failed: No space left on device
 No errors were found on the image.
-Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 cluster_size=512 
+Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 
 
 Event: refblock_alloc.write_table; errno: 28; imm: off; once: on; write -b
 write failed: No space left on device
 No errors were found on the image.
-Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 cluster_size=512 
+Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 
 
 Event: refblock_alloc.write_table; errno: 28; imm: off; once: off; write 
 write failed: No space left on device
 
 10 leaked clusters were found on the image.
 This means waste of disk space, but no harm to data.
-Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 cluster_size=512 
+Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 
 
 Event: refblock_alloc.write_table; errno: 28; imm: off; once: off; write -b
 write failed: No space left on device
 
 23 leaked clusters were found on the image.
 This means waste of disk space, but no harm to data.
-Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 cluster_size=512 
+Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 
 
 Event: refblock_alloc.switch_table; errno: 28; imm: off; once: on; write 
 write failed: No space left on device
 No errors were found on the image.
-Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 cluster_size=512 
+Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 
 
 Event: refblock_alloc.switch_table; errno: 28; imm: off; once: on; write -b
 write failed: No space left on device
 No errors were found on the image.
-Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 cluster_size=512 
+Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 
 
 Event: refblock_alloc.switch_table; errno: 28; imm: off; once: off; write 
 write failed: No space left on device
 
 10 leaked clusters were found on the image.
 This means waste of disk space, but no harm to data.
-Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 cluster_size=512 
+Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 
 
 Event: refblock_alloc.switch_table; errno: 28; imm: off; once: off; write -b
 write failed: No space left on device
@@ -547,54 +547,54 @@ This means waste of disk space, but no harm to data.
 
 === L1 growth tests ===
 
-Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 cluster_size=1024 
+Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 
 
 Event: l1_grow.alloc_table; errno: 5; imm: off; once: on
 write failed: Input/output error
 No errors were found on the image.
-Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 cluster_size=1024 
+Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 
 
 Event: l1_grow.alloc_table; errno: 5; imm: off; once: off
 write failed: Input/output error
 No errors were found on the image.
-Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 cluster_size=1024 
+Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 
 
 Event: l1_grow.alloc_table; errno: 28; imm: off; once: on
 write failed: No space left on device
 No errors were found on the image.
-Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 cluster_size=1024 
+Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 
 
 Event: l1_grow.alloc_table; errno: 28; imm: off; once: off
 write failed: No space left on device
 No errors were found on the image.
-Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 cluster_size=1024 
+Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 
 
 Event: l1_grow.write_table; errno: 5; imm: off; once: on
 write failed: Input/output error
 No errors were found on the image.
-Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 cluster_size=1024 
+Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 
 
 Event: l1_grow.write_table; errno: 5; imm: off; once: off
 qcow2_free_clusters failed: Input/output error
 write failed: Input/output error
 No errors were found on the image.
-Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 cluster_size=1024 
+Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 
 
 Event: l1_grow.write_table; errno: 28; imm: off; once: on
 write failed: No space left on device
 No errors were found on the image.
-Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 cluster_size=1024 
+Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 
 
 Event: l1_grow.write_table; errno: 28; imm: off; once: off
 qcow2_free_clusters failed: No space left on device
 write failed: No space left on device
 No errors were found on the image.
-Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 cluster_size=1024 
+Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 
 
 Event: l1_grow.activate_table; errno: 5; imm: off; once: on
 write failed: Input/output error
 No errors were found on the image.
-Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 cluster_size=1024 
+Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 
 
 Event: l1_grow.activate_table; errno: 5; imm: off; once: off
 qcow2_free_clusters failed: Input/output error
@@ -602,12 +602,12 @@ write failed: Input/output error
 
 96 leaked clusters were found on the image.
 This means waste of disk space, but no harm to data.
-Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 cluster_size=1024 
+Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 
 
 Event: l1_grow.activate_table; errno: 28; imm: off; once: on
 write failed: No space left on device
 No errors were found on the image.
-Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 cluster_size=1024 
+Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 
 
 Event: l1_grow.activate_table; errno: 28; imm: off; once: off
 qcow2_free_clusters failed: No space left on device
diff --git a/tests/qemu-iotests/029.out b/tests/qemu-iotests/029.out
index c2ad30c..0eedb3a 100644
--- a/tests/qemu-iotests/029.out
+++ b/tests/qemu-iotests/029.out
@@ -1,9 +1,9 @@
 QA output created by 029
-Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=67108864 cluster_size=65536 
+Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=67108864 
 wrote 4096/4096 bytes at offset 0
 4 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
 No errors were found on the image.
-Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=16777216 cluster_size=1024 
+Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=16777216 
 wrote 4194304/4194304 bytes at offset 0
 4 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
 No errors were found on the image.
diff --git a/tests/qemu-iotests/031.out b/tests/qemu-iotests/031.out
index 0f1bf68..e1a536e 100644
--- a/tests/qemu-iotests/031.out
+++ b/tests/qemu-iotests/031.out
@@ -2,7 +2,7 @@ QA output created by 031
 
 === Create image with unknown header extension ===
 
-Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=67108864 cluster_size=65536 
+Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=67108864 
 magic                     0x514649fb
 version                   2
 backing_file_offset       0x0
diff --git a/tests/qemu-iotests/common.rc b/tests/qemu-iotests/common.rc
index 4cb8dae..00ee754 100644
--- a/tests/qemu-iotests/common.rc
+++ b/tests/qemu-iotests/common.rc
@@ -58,7 +58,6 @@ _make_test_img()
     # extra qemu-img options can be added by tests
     # at least one argument (the image size) needs to be added
     local extra_img_options=""
-    local cluster_size_filter="s# cluster_size=[0-9]\\+##g"
     local image_size=$*
 
     if [ "$1" = "-b" ]; then
@@ -67,7 +66,6 @@ _make_test_img()
     fi
     if [ \( "$IMGFMT" = "qcow2" -o "$IMGFMT" = "qed" \) -a -n "$CLUSTER_SIZE" ]; then
         extra_img_options="-o cluster_size=$CLUSTER_SIZE $extra_img_options"
-        cluster_size_filter=""
     fi
 
     # XXX(hch): have global image options?
@@ -76,7 +74,7 @@ _make_test_img()
     	sed -e "s#$TEST_DIR#TEST_DIR#g" | \
     	sed -e "s#$IMGFMT#IMGFMT#g" | \
 	sed -e "s# encryption=off##g" | \
-	sed -e "$cluster_size_filter" | \
+	sed -e "s# cluster_size=[0-9]\\+##g" | \
 	sed -e "s# table_size=0##g" | \
 	sed -e "s# compat6=off##g" | \
 	sed -e "s# static=off##g"
