From 677ce49c04cc07d9ef2a8919988ff57cef5ea99e Mon Sep 17 00:00:00 2001 From: Max Reitz Date: Wed, 17 Jun 2015 12:42:55 +0200 Subject: [PATCH 7/9] iotests: qcow2 COW with minimal L2 cache size Message-id: <1434544976-15816-3-git-send-email-mreitz@redhat.com> Patchwork-id: 66282 O-Subject: [RHEV-7.2 qemu-kvm-rhev PATCH 2/3] iotests: qcow2 COW with minimal L2 cache size Bugzilla: 1226996 RH-Acked-by: Fam Zheng RH-Acked-by: Kevin Wolf RH-Acked-by: Stefan Hajnoczi BZ: 1226996 This adds a test case to test 103 for performing a COW operation in a qcow2 image using an L2 cache with minimal size (which should be at least two clusters so the COW can access both source and destination simultaneously). Signed-off-by: Max Reitz Reviewed-by: Alberto Garcia Signed-off-by: Kevin Wolf (cherry picked from commit a4291eafc597c0944057930acf3e51d899f79c2e) Signed-off-by: Max Reitz Signed-off-by: Miroslav Rezanina --- tests/qemu-iotests/103 | 10 ++++++++++ tests/qemu-iotests/103.out | 5 +++++ 2 files changed, 15 insertions(+) diff --git a/tests/qemu-iotests/103 b/tests/qemu-iotests/103 index ccab551..fa9a3c1 100755 --- a/tests/qemu-iotests/103 +++ b/tests/qemu-iotests/103 @@ -93,6 +93,16 @@ $QEMU_IO -c "open -o l2-cache-size=1M,refcount-cache-size=0.25M $TEST_IMG" \ -c 'read -P 42 0 64k' \ | _filter_qemu_io +echo +echo '=== Testing minimal L2 cache and COW ===' +echo + +$QEMU_IMG snapshot -c foo "$TEST_IMG" +# This requires a COW operation, which accesses two L2 tables simultaneously +# (COW source and destination), so there must be enough space in the cache to +# place both tables there (and qemu should not crash) +$QEMU_IO -c "open -o cache-size=0 $TEST_IMG" -c 'write 0 64k' | _filter_qemu_io + # success, all done echo '*** done' rm -f $seq.full diff --git a/tests/qemu-iotests/103.out b/tests/qemu-iotests/103.out index ee705b0..d05f49f 100644 --- a/tests/qemu-iotests/103.out +++ b/tests/qemu-iotests/103.out @@ -26,4 +26,9 @@ read 65536/65536 bytes at offset 0 64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec) read 65536/65536 bytes at offset 0 64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec) + +=== Testing minimal L2 cache and COW === + +wrote 65536/65536 bytes at offset 0 +64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec) *** done -- 1.8.3.1