iotests: Add test for qcow2's cache options

Add a test which tests various combinations of qcow2's cache options
(some of which are valid, some of which are not).
Signed-off-by: NMax Reitz <mreitz@redhat.com>
Signed-off-by: NKevin Wolf <kwolf@redhat.com>

tests/qemu-iotests/103

+#!/bin/bash
+#
+# Test case for qcow2 metadata cache size specification
+#
+# Copyright (C) 2014 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=mreitz@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 qcow2
+_supported_proto file
+_supported_os Linux
+
+IMG_SIZE=64K
+
+_make_test_img $IMG_SIZE
+$QEMU_IO -c 'write -P 42 0 64k' "$TEST_IMG" | _filter_qemu_io
+
+echo
+echo '=== Testing invalid option combinations ==='
+echo
+
+# all sizes set at the same time
+$QEMU_IO -c "open -o cache-size=1.25M,l2-cache-size=1M,refcount-cache-size=0.25M $TEST_IMG" \
+    2>&1 | _filter_testdir | _filter_imgfmt
+# l2-cache-size may not exceed cache-size
+$QEMU_IO -c "open -o cache-size=1M,l2-cache-size=2M $TEST_IMG" 2>&1 \
+    | _filter_testdir | _filter_imgfmt
+# refcount-cache-size may not exceed cache-size
+$QEMU_IO -c "open -o cache-size=1M,refcount-cache-size=2M $TEST_IMG" 2>&1 \
+    | _filter_testdir | _filter_imgfmt
+# 0 should be a valid size (e.g. for enforcing the minimum), so this should not
+# work
+$QEMU_IO -c "open -o cache-size=0,l2-cache-size=0,refcount-cache-size=0 $TEST_IMG" \
+    2>&1 | _filter_testdir | _filter_imgfmt
+
+echo
+echo '=== Testing valid option combinations ==='
+echo
+
+# There should be a reasonable and working minimum
+$QEMU_IO -c "open -o cache-size=0 $TEST_IMG" -c 'read -P 42 0 64k' \
+    | _filter_qemu_io
+$QEMU_IO -c "open -o l2-cache-size=0 $TEST_IMG" -c 'read -P 42 0 64k' \
+    | _filter_qemu_io
+$QEMU_IO -c "open -o refcount-cache-size=0 $TEST_IMG" -c 'read -P 42 0 64k' \
+    | _filter_qemu_io
+
+# Derive cache sizes from combined size (with a reasonable ratio, but we cannot
+# test that)
+$QEMU_IO -c "open -o cache-size=2M $TEST_IMG" -c 'read -P 42 0 64k' \
+    | _filter_qemu_io
+# Fix one cache, derive the other
+$QEMU_IO -c "open -o cache-size=2M,l2-cache-size=1M $TEST_IMG" \
+         -c 'read -P 42 0 64k' \
+    | _filter_qemu_io
+$QEMU_IO -c "open -o cache-size=2M,refcount-cache-size=1M $TEST_IMG" \
+         -c 'read -P 42 0 64k' \
+    | _filter_qemu_io
+# Directly set both caches
+$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
+
+# success, all done
+echo '*** done'
+rm -f $seq.full
+status=0

tests/qemu-iotests/103.out

+QA output created by 103
+Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=65536 
+wrote 65536/65536 bytes at offset 0
+64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+
+=== Testing invalid option combinations ===
+
+qemu-io: can't open device TEST_DIR/t.IMGFMT: cache-size, l2-cache-size and refcount-cache-size may not be set the same time
+qemu-io: can't open device TEST_DIR/t.IMGFMT: l2-cache-size may not exceed cache-size
+qemu-io: can't open device TEST_DIR/t.IMGFMT: refcount-cache-size may not exceed cache-size
+qemu-io: can't open device TEST_DIR/t.IMGFMT: cache-size, l2-cache-size and refcount-cache-size may not be set the same time
+
+=== Testing valid option combinations ===
+
+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)
+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)
+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)
+read 65536/65536 bytes at offset 0
+64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+*** done

tests/qemu-iotests/group

@@ -100,3 +100,4 @@
 091 rw auto quick
 092 rw auto quick
 095 rw auto quick
+103 rw auto quick