qemu-iotests: Try creating huge qcow2 image

It's supposed to fail gracefully instead of segfaulting.
Signed-off-by: NKevin Wolf <kwolf@redhat.com>

tests/qemu-iotests/054

+#!/bin/bash
+#
+# Test huge qcow2 images
+#
+# 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
+
+echo
+echo "creating too large image (1 EB)"
+_make_test_img $((1024*1024))T
+
+echo
+echo "creating too large image (1 EB) using qcow2.py"
+_make_test_img 4G
+./qcow2.py $TEST_IMG set-header size $((1024 ** 6))
+_check_test_img
+
+# success, all done
+echo "*** done"
+rm -f $seq.full
+status=0

tests/qemu-iotests/054.out

+QA output created by 054
+
+creating too large image (1 EB)
+qemu-img: The image size is too large for file format 'qcow2'
+Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1152921504606846976 
+
+creating too large image (1 EB) using qcow2.py
+Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=4294967296 
+qemu-img: Could not open 'TEST_DIR/t.qcow2': File too large
+*** done

tests/qemu-iotests/common.rc

@@ -167,7 +167,7 @@ _cleanup_test_img()
 
 _check_test_img()
 {
-    $QEMU_IMG check "$@" -f $IMGFMT $TEST_IMG 2>&1 | \
+    $QEMU_IMG check "$@" -f $IMGFMT $TEST_IMG 2>&1 | _filter_testdir | \
         sed -e '/allocated.*fragmented.*compressed clusters/d' \
             -e 's/qemu-img: This image format does not support checks/No errors were found on the image./' \
             -e '/Image end offset: [0-9]\+/d'

tests/qemu-iotests/group

@@ -60,3 +60,4 @@
 #051 rw auto
 052 rw auto backing
 053 rw auto
+054 rw auto