qemu-iotests: test qemu-img convert with backing file for the output image

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>

tests/qemu-iotests/019

@@ -0,0 +1,116 @@
+#!/bin/sh
+#
+# When using a backing file for the output image in qemu-img convert,
+# the backing file clusters must not copied. The data must still be
+# read correctly.
+#
+# 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, write to the Free Software
+# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307
+# USA
+#
+
+# 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
+    rm -f $TEST_IMG.base
+    rm -f $TEST_IMG.orig
+}
+trap "_cleanup; exit \$status" 0 1 2 3 15
+
+# get standard environment, filters and checks
+. ./common.rc
+. ./common.filter
+. ./common.pattern
+
+# Any format supporting backing files
+_supported_fmt qcow qcow2 vmdk
+_supported_os Linux
+
+TEST_OFFSETS="0 4294967296"
+
+_make_test_img 6G
+
+echo "Filling base image"
+echo
+
+for offset in $TEST_OFFSETS; do
+    # Some clusters with alternating backing file/image file reads
+    io writev $(( offset )) 512 1024 64
+
+    # Complete backing clusters
+    io writev $(( offset  + 1024 * 1024))  65536 65536 1
+done
+_check_test_img
+
+echo "Creating test image with backing file"
+echo
+
+mv $TEST_IMG $TEST_IMG.base
+_make_test_img -b $TEST_IMG.base 6G
+
+echo "Filling test image"
+echo
+
+for offset in $TEST_OFFSETS; do
+    # Some clusters with alternating backing file/image file reads
+    io writev $(( offset + 512 )) 512 1024 64
+
+    # Complete test image clusters
+    io writev $(( offset + 1024 * 1024 + 65536))  65536 65536 1
+done
+_check_test_img
+
+mv $TEST_IMG $TEST_IMG.orig
+$QEMU_IMG convert -O $IMGFMT -B $TEST_IMG.base $TEST_IMG.orig $TEST_IMG
+
+echo "Checking if backing clusters are allocated when they shouldn't"
+echo
+for offset in $TEST_OFFSETS; do
+    # Complete backing clusters
+    is_allocated $(( offset  + 1024 * 1024))  65536 65536 1
+done
+
+echo "Reading"
+echo
+
+for offset in $TEST_OFFSETS; do
+    # Some clusters with alternating backing file/image file reads
+    io readv $(( offset )) 512 1024 64
+    io readv $(( offset + 512 )) 512 1024 64
+
+    # Complete test image clusters
+    io readv $(( offset  + 1024 * 1024))  65536 65536 1
+    io readv $(( offset + 1024 * 1024 + 65536))  65536 65536 1
+
+    # Empty sectors
+    io_zero readv $(( offset + 1024 * 1024 + 65536 * 4 )) 65536 65536 1
+done
+_check_test_img
+
+# success, all done
+echo "*** done"
+rm -f $seq.full
+status=0

tests/qemu-iotests/common.pattern

@@ -18,6 +18,21 @@
 # USA
 #
 
+function do_is_allocated() {
+    local start=$1
+    local size=$(( $2 / 512))
+    local step=$3
+    local count=$4
+
+    for i in `seq 1 $count`; do
+        echo alloc $(( start + i * step )) $size
+    done
+}
+
+function is_allocated() {
+    do_is_allocated "$@" | $QEMU_IO $TEST_IMG | _filter_qemu_io
+}
+
 function do_io() {
     local op=$1
     local start=$2

tests/qemu-iotests/group

@@ -25,3 +25,4 @@
 016 rw auto
 017 rw backing auto
 018 rw backing auto
+019 rw backing auto