qemu-iotests: test loading internal snapshots

Test loading internal snapshots where the L1 table of the snapshot
is smaller than the current L1 table.
Signed-off-by: NKevin Wolf <kwolf@redhat.com>
Signed-off-by: NChristoph Hellwig <hch@lst.de>

tests/qemu-iotests/029

+#!/bin/bash
+#
+# Test loading internal snapshots where the L1 table of the snapshot
+# is smaller than the current L1 table.
+#
+# Copyright (C) 2011 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
+. ./common.pattern
+
+# Any format supporting intenal snapshots
+_supported_fmt qcow2
+_supported_proto generic
+_supported_os Linux
+
+CLUSTER_SIZE=65536
+_make_test_img 64M
+$QEMU_IMG snapshot -c foo $TEST_IMG
+$QEMU_IO -c 'write -b 0 4k' $TEST_IMG | _filter_qemu_io
+$QEMU_IMG snapshot -a foo $TEST_IMG
+_check_test_img
+
+CLUSTER_SIZE=1024
+_make_test_img 16M
+$QEMU_IMG snapshot -c foo $TEST_IMG
+$QEMU_IO -c 'write -b 0 4M' $TEST_IMG | _filter_qemu_io
+$QEMU_IMG snapshot -a foo $TEST_IMG
+_check_test_img
+
+# success, all done
+echo "*** done"
+rm -f $seq.full
+status=0

tests/qemu-iotests/029.out

+QA output created by 029
+Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=67108864 cluster_size=65536 
+wrote 4096/4096 bytes at offset 0
+4 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+No errors were found on the image.
+Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=16777216 cluster_size=1024 
+wrote 4194304/4194304 bytes at offset 0
+4 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+No errors were found on the image.
+*** done

tests/qemu-iotests/group

@@ -35,3 +35,4 @@
 026 rw blkdbg auto
 027 rw auto
 028 rw backing auto
+029 rw auto