Merge remote-tracking branch 'kwolf/for-anthony' into staging

* kwolf/for-anthony: (38 commits)
  qemu-iotests: Fix test 031 for qcow2 v3 support
  qemu-iotests: Add -o and make v3 the default for qcow2
  qcow2: Zero write support
  qemu-iotests: Test backing file COW with zero clusters
  qemu-iotests: add a simple test for write_zeroes
  qcow2: Support for feature table header extension
  qcow2: Support reading zero clusters
  qcow2: Version 3 images
  qcow2: Ignore reserved bits in check_refcounts
  qcow2: Ignore reserved bits in refcount table entries
  qcow2: Simplify count_cow_clusters
  qcow2: Refactor qcow2_free_any_clusters
  qcow2: Ignore reserved bits in L1/L2 entries
  qcow2: Fail write_compressed when overwriting data
  qcow2: Ignore reserved bits in count_contiguous_clusters()
  qcow2: Ignore reserved bits in get_cluster_offset
  qcow2: Save disk size in snapshot header
  Specification for qcow2 version 3
  qcow2: Fix refcount block allocation during qcow2_alloc_cluster_at()
  iotests: Resolve test failures caused by hostname
  ...

25 files changed, 798 insertions, 161 deletions

diff --git a/tests/qemu-iotests/005 b/tests/qemu-iotests/005
index 74537db..b7970e3 100755
--- a/tests/qemu-iotests/005
+++ b/tests/qemu-iotests/005
@@ -65,7 +65,7 @@ $QEMU_IO -c "read 1024 4096" $TEST_IMG | _filter_qemu_io
 
 echo
 echo "small write"
-$QEMU_IO -c "read 8192 4096" $TEST_IMG | _filter_qemu_io
+$QEMU_IO -c "write 8192 4096" $TEST_IMG | _filter_qemu_io
 
 # success, all done
 echo "*** done"
diff --git a/tests/qemu-iotests/005.out b/tests/qemu-iotests/005.out
index 718a185..2d3e7df 100644
--- a/tests/qemu-iotests/005.out
+++ b/tests/qemu-iotests/005.out
@@ -8,6 +8,6 @@ read 4096/4096 bytes at offset 1024
 4 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
 
 small write
-read 4096/4096 bytes at offset 8192
+wrote 4096/4096 bytes at offset 8192
 4 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
 *** done
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 b/tests/qemu-iotests/031
index 6365f28..2d5e3b1 100755
--- a/tests/qemu-iotests/031
+++ b/tests/qemu-iotests/031
@@ -45,26 +45,34 @@ _supported_proto generic
 _supported_os Linux
 
 CLUSTER_SIZE=65536
-echo
-echo === Create image with unknown header extension ===
-echo
-_make_test_img 64M
-./qcow2.py $TEST_IMG add-header-ext 0x12345678 "This is a test header extension"
-./qcow2.py $TEST_IMG dump-header
-_check_test_img
 
-echo
-echo === Rewrite header with no backing file ===
-echo
-$QEMU_IMG rebase -u -b "" $TEST_IMG
-./qcow2.py $TEST_IMG dump-header
-_check_test_img
+# qcow2.py output depends on the exact options used, so override the command
+# line here as an exception
+for IMGOPTS in "compat=0.10" "compat=1.1"; do
 
-echo
-echo === Add a backing file and format ===
-echo
-$QEMU_IMG rebase -u -b "/some/backing/file/path" -F host_device $TEST_IMG
-./qcow2.py $TEST_IMG dump-header
+    echo
+    echo ===== Testing with -o $IMGOPTS =====
+    echo
+    echo === Create image with unknown header extension ===
+    echo
+    _make_test_img 64M
+    ./qcow2.py $TEST_IMG add-header-ext 0x12345678 "This is a test header extension"
+    ./qcow2.py $TEST_IMG dump-header
+    _check_test_img
+
+    echo
+    echo === Rewrite header with no backing file ===
+    echo
+    $QEMU_IMG rebase -u -b "" $TEST_IMG
+    ./qcow2.py $TEST_IMG dump-header
+    _check_test_img
+
+    echo
+    echo === Add a backing file and format ===
+    echo
+    $QEMU_IMG rebase -u -b "/some/backing/file/path" -F host_device $TEST_IMG
+    ./qcow2.py $TEST_IMG dump-header
+done
 
 # success, all done
 echo "*** done"
diff --git a/tests/qemu-iotests/031.out b/tests/qemu-iotests/031.out
index 0f1bf68..d3cab30 100644
--- a/tests/qemu-iotests/031.out
+++ b/tests/qemu-iotests/031.out
@@ -1,8 +1,10 @@
 QA output created by 031
 
+===== Testing with -o compat=0.10 =====
+
 === 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
@@ -16,6 +18,11 @@ refcount_table_offset     0x10000
 refcount_table_clusters   1
 nb_snapshots              0
 snapshot_offset           0x0
+incompatible_features     0x0
+compatible_features       0x0
+autoclear_features        0x0
+refcount_order            4
+header_length             72
 
 Header extension:
 magic                     0x12345678
@@ -39,6 +46,16 @@ refcount_table_offset     0x10000
 refcount_table_clusters   1
 nb_snapshots              0
 snapshot_offset           0x0
+incompatible_features     0x0
+compatible_features       0x0
+autoclear_features        0x0
+refcount_order            4
+header_length             72
+
+Header extension:
+magic                     0x6803f857
+length                    0
+data                      ''
 
 Header extension:
 magic                     0x12345678
@@ -51,7 +68,7 @@ No errors were found on the image.
 
 magic                     0x514649fb
 version                   2
-backing_file_offset       0x90
+backing_file_offset       0x98
 backing_file_size         0x17
 cluster_bits              16
 size                      67108864
@@ -62,6 +79,11 @@ refcount_table_offset     0x10000
 refcount_table_clusters   1
 nb_snapshots              0
 snapshot_offset           0x0
+incompatible_features     0x0
+compatible_features       0x0
+autoclear_features        0x0
+refcount_order            4
+header_length             72
 
 Header extension:
 magic                     0xe2792aca
@@ -69,6 +91,112 @@ length                    11
 data                      'host_device'
 
 Header extension:
+magic                     0x6803f857
+length                    0
+data                      ''
+
+Header extension:
+magic                     0x12345678
+length                    31
+data                      'This is a test header extension'
+
+
+===== Testing with -o compat=1.1 =====
+
+=== Create image with unknown header extension ===
+
+Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=67108864 
+magic                     0x514649fb
+version                   3
+backing_file_offset       0x0
+backing_file_size         0x0
+cluster_bits              16
+size                      67108864
+crypt_method              0
+l1_size                   1
+l1_table_offset           0x30000
+refcount_table_offset     0x10000
+refcount_table_clusters   1
+nb_snapshots              0
+snapshot_offset           0x0
+incompatible_features     0x0
+compatible_features       0x0
+autoclear_features        0x0
+refcount_order            4
+header_length             104
+
+Header extension:
+magic                     0x12345678
+length                    31
+data                      'This is a test header extension'
+
+No errors were found on the image.
+
+=== Rewrite header with no backing file ===
+
+magic                     0x514649fb
+version                   3
+backing_file_offset       0x0
+backing_file_size         0x0
+cluster_bits              16
+size                      67108864
+crypt_method              0
+l1_size                   1
+l1_table_offset           0x30000
+refcount_table_offset     0x10000
+refcount_table_clusters   1
+nb_snapshots              0
+snapshot_offset           0x0
+incompatible_features     0x0
+compatible_features       0x0
+autoclear_features        0x0
+refcount_order            4
+header_length             104
+
+Header extension:
+magic                     0x6803f857
+length                    0
+data                      ''
+
+Header extension:
+magic                     0x12345678
+length                    31
+data                      'This is a test header extension'
+
+No errors were found on the image.
+
+=== Add a backing file and format ===
+
+magic                     0x514649fb
+version                   3
+backing_file_offset       0xb8
+backing_file_size         0x17
+cluster_bits              16
+size                      67108864
+crypt_method              0
+l1_size                   1
+l1_table_offset           0x30000
+refcount_table_offset     0x10000
+refcount_table_clusters   1
+nb_snapshots              0
+snapshot_offset           0x0
+incompatible_features     0x0
+compatible_features       0x0
+autoclear_features        0x0
+refcount_order            4
+header_length             104
+
+Header extension:
+magic                     0xe2792aca
+length                    11
+data                      'host_device'
+
+Header extension:
+magic                     0x6803f857
+length                    0
+data                      ''
+
+Header extension:
 magic                     0x12345678
 length                    31
 data                      'This is a test header extension'
diff --git a/tests/qemu-iotests/032 b/tests/qemu-iotests/032
new file mode 100755
index 0000000..7155568
--- /dev/null
+++ b/tests/qemu-iotests/032
@@ -0,0 +1,69 @@
+#!/bin/bash
+#
+# Test that AIO requests are drained before an image is closed. This used
+# to segfault because the request coroutine kept running even after the
+# BlockDriverState was freed.
+#
+# Copyright (C) 2011 Red Hat, Inc.
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+#
+
+# creator
+owner=kwolf@redhat.com
+
+seq=`basename $0`
+echo "QA output created by $seq"
+
+here=`pwd`
+tmp=/tmp/$$
+status=1	# failure is the default!
+
+_cleanup()
+{
+	_cleanup_test_img
+}
+trap "_cleanup; exit \$status" 0 1 2 3 15
+
+# get standard environment, filters and checks
+. ./common.rc
+. ./common.filter
+. ./common.pattern
+
+# This works for any image format (though unlikely to segfault for raw)
+_supported_fmt generic
+_supported_proto generic
+_supported_os Linux
+
+echo
+echo === Prepare image ===
+echo
+
+CLUSTER_SIZE=65536
+_make_test_img 64M
+
+# Allocate every other cluster so that afterwards a big write request will
+# actually loop a while and issue many I/O requests for the lower layer
+for i in $(seq 0 128 4096); do echo "write ${i}k 64k"; done | $QEMU_IO $TEST_IMG | _filter_qemu_io
+
+echo
+echo === AIO request during close ===
+echo
+$QEMU_IO -c "aio_write 0 4M" -c "close" $TEST_IMG | _filter_qemu_io
+_check_test_img
+
+# success, all done
+echo "*** done"
+rm -f $seq.full
+status=0
diff --git a/tests/qemu-iotests/032.out b/tests/qemu-iotests/032.out
new file mode 100644
index 0000000..7272ac2
--- /dev/null
+++ b/tests/qemu-iotests/032.out
@@ -0,0 +1,78 @@
+QA output created by 032
+
+=== Prepare image ===
+
+Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=67108864 
+qemu-io> wrote 65536/65536 bytes at offset 0
+64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+qemu-io> wrote 65536/65536 bytes at offset 131072
+64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+qemu-io> wrote 65536/65536 bytes at offset 262144
+64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+qemu-io> wrote 65536/65536 bytes at offset 393216
+64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+qemu-io> wrote 65536/65536 bytes at offset 524288
+64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+qemu-io> wrote 65536/65536 bytes at offset 655360
+64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+qemu-io> wrote 65536/65536 bytes at offset 786432
+64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+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> wrote 65536/65536 bytes at offset 1048576
+64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+qemu-io> wrote 65536/65536 bytes at offset 1179648
+64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+qemu-io> wrote 65536/65536 bytes at offset 1310720
+64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+qemu-io> wrote 65536/65536 bytes at offset 1441792
+64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+qemu-io> wrote 65536/65536 bytes at offset 1572864
+64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+qemu-io> wrote 65536/65536 bytes at offset 1703936
+64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+qemu-io> wrote 65536/65536 bytes at offset 1835008
+64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+qemu-io> wrote 65536/65536 bytes at offset 1966080
+64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+qemu-io> wrote 65536/65536 bytes at offset 2097152
+64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+qemu-io> wrote 65536/65536 bytes at offset 2228224
+64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+qemu-io> wrote 65536/65536 bytes at offset 2359296
+64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+qemu-io> wrote 65536/65536 bytes at offset 2490368
+64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+qemu-io> wrote 65536/65536 bytes at offset 2621440
+64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+qemu-io> wrote 65536/65536 bytes at offset 2752512
+64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+qemu-io> wrote 65536/65536 bytes at offset 2883584
+64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+qemu-io> wrote 65536/65536 bytes at offset 3014656
+64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+qemu-io> wrote 65536/65536 bytes at offset 3145728
+64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+qemu-io> wrote 65536/65536 bytes at offset 3276800
+64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+qemu-io> wrote 65536/65536 bytes at offset 3407872
+64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+qemu-io> wrote 65536/65536 bytes at offset 3538944
+64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+qemu-io> wrote 65536/65536 bytes at offset 3670016
+64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+qemu-io> wrote 65536/65536 bytes at offset 3801088
+64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+qemu-io> wrote 65536/65536 bytes at offset 3932160
+64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+qemu-io> wrote 65536/65536 bytes at offset 4063232
+64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+qemu-io> wrote 65536/65536 bytes at offset 4194304
+64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+qemu-io> 
+=== AIO request during close ===
+
+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.
+*** done
diff --git a/tests/qemu-iotests/033 b/tests/qemu-iotests/033
new file mode 100755
index 0000000..9aee078
--- /dev/null
+++ b/tests/qemu-iotests/033
@@ -0,0 +1,73 @@
+#!/bin/bash
+#
+# Test aligned and misaligned write zeroes operations.
+#
+# Copyright (C) 2012 Red Hat, Inc.
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+#
+
+# creator
+owner=pbonzini@redhat.com
+
+seq=`basename $0`
+echo "QA output created by $seq"
+
+here=`pwd`
+tmp=/tmp/$$
+status=1	# failure is the default!
+
+_cleanup()
+{
+	_cleanup_test_img
+}
+trap "_cleanup; exit \$status" 0 1 2 3 15
+
+# get standard environment, filters and checks
+. ./common.rc
+. ./common.filter
+
+_supported_fmt generic
+_supported_proto generic
+_supported_os Linux
+
+
+size=128M
+_make_test_img $size
+
+echo
+echo "== preparing image =="
+$QEMU_IO -c "write -P 0xa 0x200 0x400" $TEST_IMG | _filter_qemu_io
+$QEMU_IO -c "write -P 0xa 0x20000 0x600" $TEST_IMG | _filter_qemu_io
+$QEMU_IO -c "write -z 0x400 0x20000" $TEST_IMG | _filter_qemu_io
+
+echo
+echo "== verifying patterns (1) =="
+$QEMU_IO -c "read -P 0xa 0x200 0x200" $TEST_IMG | _filter_qemu_io
+$QEMU_IO -c "read -P 0x0 0x400 0x20000" $TEST_IMG | _filter_qemu_io
+$QEMU_IO -c "read -P 0xa 0x20400 0x200" $TEST_IMG | _filter_qemu_io
+
+echo
+echo "== rewriting zeroes =="
+$QEMU_IO -c "write -P 0xb 0x10000 0x10000" $TEST_IMG | _filter_qemu_io
+$QEMU_IO -c "write -z 0x10000 0x10000" $TEST_IMG | _filter_qemu_io
+
+echo
+echo "== verifying patterns (2) =="
+$QEMU_IO -c "read -P 0x0 0x400 0x20000" $TEST_IMG | _filter_qemu_io
+
+# success, all done
+echo "*** done"
+rm -f $seq.full
+status=0
diff --git a/tests/qemu-iotests/033.out b/tests/qemu-iotests/033.out
new file mode 100644
index 0000000..8934883
--- /dev/null
+++ b/tests/qemu-iotests/033.out
@@ -0,0 +1,29 @@
+QA output created by 033
+Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=134217728 
+
+== preparing image ==
+wrote 1024/1024 bytes at offset 512
+1 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+wrote 1536/1536 bytes at offset 131072
+2 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+wrote 131072/131072 bytes at offset 1024
+128 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+
+== verifying patterns (1) ==
+read 512/512 bytes at offset 512
+512.000000 bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+read 131072/131072 bytes at offset 1024
+128 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+read 512/512 bytes at offset 132096
+512.000000 bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+
+== rewriting zeroes ==
+wrote 65536/65536 bytes at offset 65536
+64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+wrote 65536/65536 bytes at offset 65536
+64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+
+== verifying patterns (2) ==
+read 131072/131072 bytes at offset 1024
+128 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+*** done
diff --git a/tests/qemu-iotests/034 b/tests/qemu-iotests/034
new file mode 100755
index 0000000..8254df8
--- /dev/null
+++ b/tests/qemu-iotests/034
@@ -0,0 +1,113 @@
+#!/bin/bash
+#
+# Test bdrv_write_zeroes with backing files
+#
+# Copyright (C) 2012 Red Hat, Inc.
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+#
+
+# creator
+owner=kwolf@redhat.com
+
+seq=`basename $0`
+echo "QA output created by $seq"
+
+here=`pwd`
+tmp=/tmp/$$
+status=1	# failure is the default!
+
+_cleanup()
+{
+	_cleanup_test_img
+}
+trap "_cleanup; exit \$status" 0 1 2 3 15
+
+# get standard environment, filters and checks
+. ./common.rc
+. ./common.filter
+
+_supported_fmt qcow qcow2 vmdk qed
+_supported_proto generic
+_supported_os Linux
+
+CLUSTER_SIZE=4k
+size=128M
+
+echo
+echo "== creating backing file for COW tests =="
+
+_make_test_img $size
+$QEMU_IO -c "write -P 0x55 0 1M" $TEST_IMG | _filter_qemu_io
+mv $TEST_IMG $TEST_IMG.base
+
+_make_test_img -b $TEST_IMG.base 6G
+
+echo
+echo "== zero write with backing file =="
+$QEMU_IO -c "write -z 64k 192k" $TEST_IMG | _filter_qemu_io
+$QEMU_IO -c "write -z 513k 13k" $TEST_IMG | _filter_qemu_io
+
+_check_test_img
+
+echo
+echo "== verifying patterns (3) =="
+$QEMU_IO -c "read -P 0x55 0 64k" $TEST_IMG | _filter_qemu_io
+$QEMU_IO -c "read -P 0x0 64k 192k" $TEST_IMG | _filter_qemu_io
+$QEMU_IO -c "read -P 0x55 256k 257k" $TEST_IMG | _filter_qemu_io
+$QEMU_IO -c "read -P 0x0 513k 13k" $TEST_IMG | _filter_qemu_io
+$QEMU_IO -c "read -P 0x55 526k 498k" $TEST_IMG | _filter_qemu_io
+
+echo
+echo "== overwriting zero cluster =="
+$QEMU_IO -c "write -P 0xa 60k 8k" $TEST_IMG | _filter_qemu_io
+$QEMU_IO -c "write -P 0xb 64k 8k" $TEST_IMG | _filter_qemu_io
+$QEMU_IO -c "write -P 0xc 76k 4k" $TEST_IMG | _filter_qemu_io
+$QEMU_IO -c "write -P 0xd 252k 8k" $TEST_IMG | _filter_qemu_io
+$QEMU_IO -c "write -P 0xe 248k 8k" $TEST_IMG | _filter_qemu_io
+
+_check_test_img
+
+echo
+echo "== verifying patterns (4) =="
+$QEMU_IO -c "read -P 0x55 0 60k" $TEST_IMG | _filter_qemu_io
+$QEMU_IO -c "read -P 0xa 60k 4k" $TEST_IMG | _filter_qemu_io
+$QEMU_IO -c "read -P 0xb 64k 8k" $TEST_IMG | _filter_qemu_io
+$QEMU_IO -c "read -P 0x0 72k 4k" $TEST_IMG | _filter_qemu_io
+$QEMU_IO -c "read -P 0xc 76k 4k" $TEST_IMG | _filter_qemu_io
+$QEMU_IO -c "read -P 0x0 80k 168k" $TEST_IMG | _filter_qemu_io
+$QEMU_IO -c "read -P 0xe 248k 8k" $TEST_IMG | _filter_qemu_io
+$QEMU_IO -c "read -P 0xd 256k 4k" $TEST_IMG | _filter_qemu_io
+$QEMU_IO -c "read -P 0x55 260k 64k" $TEST_IMG | _filter_qemu_io
+
+echo
+echo "== re-zeroing overwritten area =="
+$QEMU_IO -c "write -z 64k 192k" $TEST_IMG | _filter_qemu_io
+
+_check_test_img
+
+echo
+echo "== verifying patterns (5) =="
+$QEMU_IO -c "read -P 0x55 0 60k" $TEST_IMG | _filter_qemu_io
+$QEMU_IO -c "read -P 0xa 60k 4k" $TEST_IMG | _filter_qemu_io
+$QEMU_IO -c "read -P 0x0 64k 192k" $TEST_IMG | _filter_qemu_io
+$QEMU_IO -c "read -P 0xd 256k 4k" $TEST_IMG | _filter_qemu_io
+$QEMU_IO -c "read -P 0x55 260k 253k" $TEST_IMG | _filter_qemu_io
+$QEMU_IO -c "read -P 0x0 513k 13k" $TEST_IMG | _filter_qemu_io
+$QEMU_IO -c "read -P 0x55 526k 498k" $TEST_IMG | _filter_qemu_io
+
+# success, all done
+echo "*** done"
+rm -f $seq.full
+status=0
diff --git a/tests/qemu-iotests/034.out b/tests/qemu-iotests/034.out
new file mode 100644
index 0000000..e82dae5
--- /dev/null
+++ b/tests/qemu-iotests/034.out
@@ -0,0 +1,81 @@
+QA output created by 034
+
+== creating backing file for COW tests ==
+Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=134217728 
+wrote 1048576/1048576 bytes at offset 0
+1 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=6442450944 backing_file='TEST_DIR/t.IMGFMT.base' 
+
+== zero write with backing file ==
+wrote 196608/196608 bytes at offset 65536
+192 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+wrote 13312/13312 bytes at offset 525312
+13 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+No errors were found on the image.
+
+== verifying patterns (3) ==
+read 65536/65536 bytes at offset 0
+64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+read 196608/196608 bytes at offset 65536
+192 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+read 263168/263168 bytes at offset 262144
+257 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+read 13312/13312 bytes at offset 525312
+13 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+read 509952/509952 bytes at offset 538624
+498 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+
+== overwriting zero cluster ==
+wrote 8192/8192 bytes at offset 61440
+8 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+wrote 8192/8192 bytes at offset 65536
+8 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+wrote 4096/4096 bytes at offset 77824
+4 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+wrote 8192/8192 bytes at offset 258048
+8 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+wrote 8192/8192 bytes at offset 253952
+8 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+No errors were found on the image.
+
+== verifying patterns (4) ==
+read 61440/61440 bytes at offset 0
+60 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+read 4096/4096 bytes at offset 61440
+4 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+read 8192/8192 bytes at offset 65536
+8 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+read 4096/4096 bytes at offset 73728
+4 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+read 4096/4096 bytes at offset 77824
+4 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+read 172032/172032 bytes at offset 81920
+168 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+read 8192/8192 bytes at offset 253952
+8 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+read 4096/4096 bytes at offset 262144
+4 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+read 65536/65536 bytes at offset 266240
+64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+
+== re-zeroing overwritten area ==
+wrote 196608/196608 bytes at offset 65536
+192 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+No errors were found on the image.
+
+== verifying patterns (5) ==
+read 61440/61440 bytes at offset 0
+60 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+read 4096/4096 bytes at offset 61440
+4 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+read 196608/196608 bytes at offset 65536
+192 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+read 4096/4096 bytes at offset 262144
+4 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+read 259072/259072 bytes at offset 266240
+253 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+read 13312/13312 bytes at offset 525312
+13 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+read 509952/509952 bytes at offset 538624
+498 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+*** done
diff --git a/tests/qemu-iotests/check b/tests/qemu-iotests/check
index aae1378..432732c 100755
--- a/tests/qemu-iotests/check
+++ b/tests/qemu-iotests/check
@@ -41,9 +41,6 @@ then
     exit 1
 fi
 
-# we need common
-. ./common
-
 # we need common.rc
 if ! . ./common.rc
 then
@@ -51,6 +48,9 @@ then
     exit 1
 fi
 
+# we need common
+. ./common
+
 #if [ `id -u` -ne 0 ]
 #then
 #    echo "check: QA must be run as root"
diff --git a/tests/qemu-iotests/common b/tests/qemu-iotests/common
index c187f6c..eeb70cb 100644
--- a/tests/qemu-iotests/common
+++ b/tests/qemu-iotests/common
@@ -35,6 +35,7 @@ diff="diff -u"
 verbose=false
 group=false
 xgroup=false
+imgopts=false
 showme=false
 sortme=false
 expunge=true
@@ -44,6 +45,7 @@ rm -f $tmp.list $tmp.tmp $tmp.sed
 
 export IMGFMT=raw
 export IMGPROTO=file
+export IMGOPTS=""
 export QEMU_IO_OPTIONS=""
 
 for r
@@ -103,6 +105,13 @@ s/ .*//p
 	mv $tmp.tmp $tmp.list
 	xgroup=false
 	continue
+
+    elif $imgopts
+    then
+        IMGOPTS="$r"
+        imgopts=false
+        continue
+
     fi
 
     xpand=true
@@ -130,6 +139,7 @@ check options
     -nocache		use O_DIRECT on backing file
     -misalign		misalign memory allocations
     -n			show me, do not run tests
+    -o options          -o options to pass to qemu-img create/convert
     -T			output timestamps
     -r 			randomize test order
     
@@ -223,6 +233,10 @@ testlist options
 	    showme=true
 	    xpand=false
 	    ;;
+        -o)
+            imgopts=true
+            xpand=false
+            ;;
         -r)	# randomize test order
 	    randomize=true
 	    xpand=false
@@ -299,6 +313,9 @@ BEGIN	{ for (t='$start'; t<='$end'; t++) printf "%03d\n",t }' \
 
 done
 
+# Set default options for qemu-img create -o if they were not specified
+_set_default_imgopts
+
 if [ -s $tmp.list ]
 then
     # found some valid test numbers ... this is good
diff --git a/tests/qemu-iotests/common.config b/tests/qemu-iotests/common.config
index a220684..df082e7 100644
--- a/tests/qemu-iotests/common.config
+++ b/tests/qemu-iotests/common.config
@@ -36,7 +36,7 @@ export LANG=C
 
 PATH=".:$PATH"
 
-HOST=`hostname -s`
+HOST=`hostname -s 2> /dev/null`
 HOSTOS=`uname -s`
 
 EMAIL=root@localhost    # where auto-qa will send its status messages
diff --git a/tests/qemu-iotests/common.rc b/tests/qemu-iotests/common.rc
index 4cb8dae..4bc7420 100644
--- a/tests/qemu-iotests/common.rc
+++ b/tests/qemu-iotests/common.rc
@@ -53,21 +53,44 @@ else
     TEST_IMG=$IMGPROTO:$TEST_DIR/t.$IMGFMT
 fi
 
+_optstr_add()
+{
+    if [ -n "$1" ]; then
+        echo "$1,$2"
+    else
+        echo "$2"
+    fi
+}
+
+_set_default_imgopts()
+{
+    if [ "$IMGFMT" == "qcow2" ] && ! (echo "$IMGOPTS" | grep "compat=" > /dev/null); then
+        IMGOPTS=$(_optstr_add "$IMGOPTS" "compat=1.1")
+    fi
+}
+
 _make_test_img()
 {
     # extra qemu-img options can be added by tests
     # at least one argument (the image size) needs to be added
     local extra_img_options=""
-    local cluster_size_filter="s# cluster_size=[0-9]\\+##g"
     local image_size=$*
+    local optstr=""
+
+    if [ -n "$IMGOPTS" ]; then
+        optstr=$(_optstr_add "$optstr" "$IMGOPTS")
+    fi
 
     if [ "$1" = "-b" ]; then
         extra_img_options="$1 $2"
         image_size=$3
     fi
     if [ \( "$IMGFMT" = "qcow2" -o "$IMGFMT" = "qed" \) -a -n "$CLUSTER_SIZE" ]; then
-        extra_img_options="-o cluster_size=$CLUSTER_SIZE $extra_img_options"
-        cluster_size_filter=""
+        optstr=$(_optstr_add "$optstr" "cluster_size=$CLUSTER_SIZE")
+    fi
+
+    if [ -n "$optstr" ]; then
+        extra_img_options="-o $optstr $extra_img_options"
     fi
 
     # XXX(hch): have global image options?
@@ -76,8 +99,9 @@ _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# compat='[^']*'##g" | \
 	sed -e "s# compat6=off##g" | \
 	sed -e "s# static=off##g"
 }
@@ -270,7 +294,11 @@ _require_command()
 
 _full_imgfmt_details()
 {
-    echo "$IMGFMT"
+    if [ -n "$IMGOPTS" ]; then
+        echo "$IMGFMT ($IMGOPTS)"
+    else
+        echo "$IMGFMT"
+    fi
 }
 
 _full_imgproto_details()
diff --git a/tests/qemu-iotests/group b/tests/qemu-iotests/group
index 1742ede..5934829 100644
--- a/tests/qemu-iotests/group
+++ b/tests/qemu-iotests/group
@@ -38,3 +38,6 @@
 029 rw auto quick
 030 rw auto
 031 rw auto quick
+032 rw auto
+033 rw auto
+034 rw auto backing
diff --git a/tests/qemu-iotests/qcow2.py b/tests/qemu-iotests/qcow2.py
index bfb47e8..e27196a 100755
--- a/tests/qemu-iotests/qcow2.py
+++ b/tests/qemu-iotests/qcow2.py
@@ -35,6 +35,13 @@ class QcowHeader:
         [ uint32_t, '%d',   'refcount_table_clusters' ],
         [ uint32_t, '%d',   'nb_snapshots' ],
         [ uint64_t, '%#x',  'snapshot_offset' ],
+
+        # Version 3 header fields
+        [ uint64_t, '%#x',  'incompatible_features' ],
+        [ uint64_t, '%#x',  'compatible_features' ],
+        [ uint64_t, '%#x',  'autoclear_features' ],
+        [ uint32_t, '%d',   'refcount_order' ],
+        [ uint32_t, '%d',   'header_length' ],
     ];
 
     fmt = '>' + ''.join(field[0] for field in fields)
@@ -50,9 +57,10 @@ class QcowHeader:
         self.__dict__ = dict((field[2], header[i])
             for i, field in enumerate(QcowHeader.fields))
 
+        self.set_defaults()
         self.cluster_size = 1 << self.cluster_bits
 
-        fd.seek(self.get_header_length())
+        fd.seek(self.header_length)
         self.load_extensions(fd)
 
         if self.backing_file_offset:
@@ -61,11 +69,13 @@ class QcowHeader:
         else:
             self.backing_file = None
 
-    def get_header_length(self):
+    def set_defaults(self):
         if self.version == 2:
-            return 72
-        else:
-            raise Exception("version != 2 not supported")
+            self.incompatible_features = 0
+            self.compatible_features = 0
+            self.autoclear_features = 0
+            self.refcount_order = 4
+            self.header_length = 72
 
     def load_extensions(self, fd):
         self.extensions = []
@@ -86,7 +96,7 @@ class QcowHeader:
 
     def update_extensions(self, fd):
 
-        fd.seek(self.get_header_length())
+        fd.seek(self.header_length)
         extensions = self.extensions
         extensions.append(QcowHeaderExtension(0, 0, ""))
         for ex in extensions:
@@ -103,7 +113,7 @@ class QcowHeader:
 
 
     def update(self, fd):
-        header_bytes = self.get_header_length()
+        header_bytes = self.header_length
 
         self.update_extensions(fd)