1#!/bin/bash 2# 3# Test that backing files can be smaller than the image 4# 5# Copyright (C) 2010 IBM, Corp. 6# 7# Based on 017: 8# Copyright (C) 2009 Red Hat, Inc. 9# 10# This program is free software; you can redistribute it and/or modify 11# it under the terms of the GNU General Public License as published by 12# the Free Software Foundation; either version 2 of the License, or 13# (at your option) any later version. 14# 15# This program is distributed in the hope that it will be useful, 16# but WITHOUT ANY WARRANTY; without even the implied warranty of 17# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 18# GNU General Public License for more details. 19# 20# You should have received a copy of the GNU General Public License 21# along with this program. If not, see <http://www.gnu.org/licenses/>. 22# 23 24# creator 25owner=stefanha@linux.vnet.ibm.com 26 27seq=`basename $0` 28echo "QA output created by $seq" 29 30here=`pwd` 31tmp=/tmp/$$ 32status=1 # failure is the default! 33 34_cleanup() 35{ 36 _cleanup_test_img 37} 38trap "_cleanup; exit \$status" 0 1 2 3 15 39 40# get standard environment, filters and checks 41. ./common.rc 42. ./common.filter 43. ./common.pattern 44 45# Any format supporting backing files except vmdk and qcow which do not support 46# smaller backing files. 47_supported_fmt qcow2 qed 48_supported_proto file 49_supported_os Linux 50 51# Choose a size that is not necessarily a cluster size multiple for image 52# formats that use clusters. This will ensure that the base image doesn't end 53# precisely on a cluster boundary (the easy case). 54image_size=$(( 4 * 1024 * 1024 * 1024 + 3 * 512 )) 55 56# The base image is smaller than the image file 57base_size=$(( image_size - 1024 * 1024 * 1024 )) 58 59offset=$(( base_size - 32 * 1024 )) 60 61_make_test_img $base_size 62 63echo "Filling base image" 64echo 65 66# Fill end of base image with a pattern, skipping every other sector 67io writev $offset 512 1024 32 68 69_check_test_img 70 71echo "Creating test image with backing file" 72echo 73 74mv "$TEST_IMG" "$TEST_IMG.base" 75_make_test_img -b "$TEST_IMG.base" $image_size 76 77echo "Filling test image" 78echo 79 80# Write every other sector around where the base image ends 81io writev $(( offset + 512 )) 512 1024 64 82 83_check_test_img 84 85echo "Reading" 86echo 87 88# Base image sectors 89io readv $(( offset )) 512 1024 32 90 91# Image sectors 92io readv $(( offset + 512 )) 512 1024 64 93 94# Zero sectors beyond end of base image 95io_zero readv $(( offset + 32 * 1024 )) 512 1024 32 96 97_check_test_img 98 99# Rebase it on top of its base image 100$QEMU_IMG rebase -b "$TEST_IMG.base" "$TEST_IMG" 101 102_check_test_img 103 104# success, all done 105echo "*** done" 106rm -f $seq.full 107status=0 108