iotests: Add test for qcow2 L1 table update

Updating the L1 table should not result in random data being written.
This adds a test for that.
Signed-off-by: NMax Reitz <mreitz@redhat.com>
Reviewed-by: NEric Blake <eblake@redhat.com>
Signed-off-by: NKevin Wolf <kwolf@redhat.com>

tests/qemu-iotests/107

+#!/bin/bash
+#
+# Tests updates of the qcow2 L1 table
+#
+# 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
+
+echo
+echo '=== Updates should not write random data ==='
+echo
+
+_make_test_img $IMG_SIZE
+$QEMU_IO -c 'write 0 64k' "$TEST_IMG" | _filter_qemu_io
+$QEMU_IO -c "open -o driver=raw $TEST_IMG" -c 'read -p -P 0 196616 65528' \
+    | _filter_qemu_io
+
+# success, all done
+echo "*** done"
+rm -f $seq.full
+status=0
+

tests/qemu-iotests/107.out

+QA output created by 107
+
+=== Updates should not write random data ===
+
+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)
+read 65528/65528 bytes at offset 196616
+63.992 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+*** done

tests/qemu-iotests/group

@@ -107,4 +107,5 @@
 103 rw auto quick
 104 rw auto
 105 rw auto quick
+107 rw auto quick
 108 rw auto quick