qemu-iotests: Add regression test for b7ab0fea

It turned out that the change in b7ab0fea was actually a real qcow2
corruption fix. This is a reproducer for the bug.
Signed-off-by: NKevin Wolf <kwolf@redhat.com>
Signed-off-by: NStefan Hajnoczi <stefanha@redhat.com>

tests/qemu-iotests/047

+#!/bin/bash
+#
+# Regression test for commit b7ab0fea (which was a corruption fix,
+# despite the commit message claiming otherwise)
+#
+# Copyright (C) 2013 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 qcow2
+_supported_proto generic
+_supported_os Linux
+
+size=128M
+
+_make_test_img $size
+
+function qemu_io_cmds()
+{
+cat <<EOF
+write -P 0x66 0 320k
+write 320k 128k
+write -P 0x55 1M 128k
+write -P 0x88 448k 128k
+discard 320k 128k
+aio_flush
+
+write -P 0x77 0 480k
+aio_flush
+
+read -P 0x77 0 480k
+read -P 0x88 480k 96k
+read -P 0x55 1M 128k
+EOF
+}
+
+qemu_io_cmds | $QEMU_IO $TEST_IMG | _filter_qemu_io
+_check_test_img
+
+# success, all done
+echo "*** done"
+rm -f $seq.full
+status=0

tests/qemu-iotests/047.out

+QA output created by 047
+Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=134217728 
+qemu-io> wrote 327680/327680 bytes at offset 0
+320 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+qemu-io> wrote 131072/131072 bytes at offset 327680
+128 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+qemu-io> wrote 131072/131072 bytes at offset 1048576
+128 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+qemu-io> wrote 131072/131072 bytes at offset 458752
+128 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+qemu-io> discard 131072/131072 bytes at offset 327680
+128 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+qemu-io> qemu-io> qemu-io> wrote 491520/491520 bytes at offset 0
+480 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+qemu-io> qemu-io> qemu-io> read 491520/491520 bytes at offset 0
+480 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+qemu-io> read 98304/98304 bytes at offset 491520
+96 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+qemu-io> read 131072/131072 bytes at offset 1048576
+128 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+qemu-io> No errors were found on the image.
+*** done

tests/qemu-iotests/group

@@ -53,3 +53,4 @@
 044 rw auto
 045 rw auto
 046 rw auto aio
+047 rw auto