From 292fd30c299230aa76a13395a8771ac554c76ffc Mon Sep 17 00:00:00 2001
From: Max Reitz <mreitz@redhat.com>
Date: Wed, 17 Jun 2015 12:42:55 +0200
Subject: [PATCH 013/217] 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 <famz@redhat.com>
RH-Acked-by: Kevin Wolf <kwolf@redhat.com>
RH-Acked-by: Stefan Hajnoczi <stefanha@redhat.com>
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 <mreitz@redhat.com>
Reviewed-by: Alberto Garcia <berto@igalia.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
(cherry picked from commit a4291eafc597c0944057930acf3e51d899f79c2e)
Signed-off-by: Max Reitz <mreitz@redhat.com>
Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
---
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