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iotests: qcow2 COW with minimal L2 cache size 

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>
This commit is contained in:
Max Reitz 2015-06-01 18:09:18 +02:00 committed by Kevin Wolf
parent 57e2166959
commit a4291eafc5
2 changed files with 15 additions and 0 deletions
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10
tests/qemu-iotests/103
View File

@ -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

5
tests/qemu-iotests/103.out
View File

@ -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