1 files changed, 162 insertions, 0 deletions
diff --git a/tests/qemu-iotests/028 b/tests/qemu-iotests/028
new file mode 100755
index 000000000..8c391f2ad
--- /dev/null
+++ b/tests/qemu-iotests/028
@@ -0,0 +1,162 @@
+#!/usr/bin/env bash
+# group: rw backing quick
+#
+# Test that backing files can be smaller than the image
+#
+# Copyright (C) 2010 IBM, Corp.
+#
+# Based on 017:
+# Copyright (C) 2009 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=stefanha@linux.vnet.ibm.com
+
+seq=`basename $0`
+echo "QA output created by $seq"
+
+status=1	# failure is the default!
+
+_cleanup()
+{
+    _cleanup_qemu
+    _rm_test_img "${TEST_IMG}.copy"
+    _cleanup_test_img
+}
+trap "_cleanup; exit \$status" 0 1 2 3 15
+
+# get standard environment, filters and checks
+. ./common.rc
+. ./common.filter
+. ./common.pattern
+. ./common.qemu
+
+# Any format supporting backing files except vmdk and qcow which do not support
+# smaller backing files.
+_supported_fmt qcow2 qed
+_supported_proto file fuse
+_supported_os Linux
+
+# Choose a size that is not necessarily a cluster size multiple for image
+# formats that use clusters.  This will ensure that the base image doesn't end
+# precisely on a cluster boundary (the easy case).
+image_size=$(( 4 * 1024 * 1024 * 1024 + 3 * 512 ))
+
+# The base image is smaller than the image file
+base_size=$(( image_size - 1024 * 1024 * 1024 ))
+
+offset=$(( base_size - 32 * 1024 ))
+
+TEST_IMG_SAVE="$TEST_IMG"
+TEST_IMG="$TEST_IMG.base"
+
+_make_test_img $base_size
+
+echo "Filling base image"
+echo
+
+# Fill end of base image with a pattern, skipping every other sector
+io writev $offset 512 1024 32
+
+_check_test_img
+
+echo "Creating test image with backing file"
+echo
+
+TEST_IMG="$TEST_IMG_SAVE"
+_make_test_img -b "$TEST_IMG.base" -F $IMGFMT $image_size
+
+echo "Filling test image"
+echo
+
+# Write every other sector around where the base image ends
+io writev $(( offset + 512 )) 512 1024 64
+
+_check_test_img
+
+echo "Reading"
+echo
+
+# Base image sectors
+io readv $(( offset )) 512 1024 32
+
+# Image sectors
+io readv $(( offset + 512 )) 512 1024 64
+
+# Zero sectors beyond end of base image
+io_zero readv $(( offset + 32 * 1024 )) 512 1024 32
+
+_check_test_img
+
+# Rebase it on top of its base image
+$QEMU_IMG rebase -b "$TEST_IMG.base" -F $IMGFMT "$TEST_IMG"
+
+echo
+echo block-backup
+echo
+
+qemu_comm_method="monitor"
+_launch_qemu -drive file="${TEST_IMG}",cache=${CACHEMODE},aio=${AIOMODE},id=disk
+h=$QEMU_HANDLE
+if [ "${VALGRIND_QEMU}" == "y" ]; then
+    QEMU_COMM_TIMEOUT=7
+else
+    QEMU_COMM_TIMEOUT=1
+fi
+
+TEST_IMG="$TEST_IMG.copy" _make_test_img $image_size
+_send_qemu_cmd $h "drive_backup -n disk ${TEST_IMG}.copy" "(qemu)" \
+    | _filter_imgfmt
+
+silent=y qemu_cmd_repeat=20 _send_qemu_cmd $h "info block-jobs" "No active jobs"
+_send_qemu_cmd $h "info block-jobs" "No active jobs"
+_send_qemu_cmd $h 'quit' ""
+
+# Base image sectors
+TEST_IMG="${TEST_IMG}.copy" io readv $(( offset )) 512 1024 32
+
+# Image sectors
+TEST_IMG="${TEST_IMG}.copy" io readv $(( offset + 512 )) 512 1024 64
+
+# Zero sectors beyond end of base image
+TEST_IMG="${TEST_IMG}.copy" io_zero readv $(( offset + 32 * 1024 )) 512 1024 32
+
+
+_check_test_img
+
+echo
+echo '=== Reading across backing EOF in one operation ==='
+echo
+
+# Use a cluster boundary as the base end here
+base_size=$((3 * 1024 * 1024 * 1024))
+
+TEST_IMG="$TEST_IMG.base" _make_test_img $base_size
+_make_test_img -b "$TEST_IMG.base" -F $IMGFMT $image_size
+
+# Write 16 times 42 at the end of the base image
+$QEMU_IO -c "write -P 42 $((base_size - 16)) 16" "$TEST_IMG.base" \
+    | _filter_qemu_io
+
+# Read 32 bytes across the base EOF from the top;
+# should be 16 times 0x2a, then 16 times 0x00
+$QEMU_IO -c "read -v $((base_size - 16)) 32" "$TEST_IMG" \
+    | _filter_qemu_io
+
+# success, all done
+echo "*** done"
+rm -f $seq.full
+status=0