1#!/usr/bin/env bash 2# group: rw backing quick 3# 4# Test that backing files can be smaller than the image 5# 6# Copyright (C) 2010 IBM, Corp. 7# 8# Based on 017: 9# Copyright (C) 2009 Red Hat, Inc. 10# 11# This program is free software; you can redistribute it and/or modify 12# it under the terms of the GNU General Public License as published by 13# the Free Software Foundation; either version 2 of the License, or 14# (at your option) any later version. 15# 16# This program is distributed in the hope that it will be useful, 17# but WITHOUT ANY WARRANTY; without even the implied warranty of 18# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 19# GNU General Public License for more details. 20# 21# You should have received a copy of the GNU General Public License 22# along with this program. If not, see <http://www.gnu.org/licenses/>. 23# 24 25# creator 26owner=stefanha@redhat.com 27 28seq=`basename $0` 29echo "QA output created by $seq" 30 31status=1 # failure is the default! 32 33_cleanup() 34{ 35 _cleanup_qemu 36 _rm_test_img "${TEST_IMG}.copy" 37 _cleanup_test_img 38} 39trap "_cleanup; exit \$status" 0 1 2 3 15 40 41# get standard environment, filters and checks 42. ./common.rc 43. ./common.filter 44. ./common.pattern 45. ./common.qemu 46 47# Any format supporting backing files except vmdk and qcow which do not support 48# smaller backing files. 49_supported_fmt qcow2 qed 50_supported_proto file fuse 51_supported_os Linux 52 53# Choose a size that is not necessarily a cluster size multiple for image 54# formats that use clusters. This will ensure that the base image doesn't end 55# precisely on a cluster boundary (the easy case). 56image_size=$(( 4 * 1024 * 1024 * 1024 + 3 * 512 )) 57 58# The base image is smaller than the image file 59base_size=$(( image_size - 1024 * 1024 * 1024 )) 60 61offset=$(( base_size - 32 * 1024 )) 62 63TEST_IMG_SAVE="$TEST_IMG" 64TEST_IMG="$TEST_IMG.base" 65 66_make_test_img $base_size 67 68echo "Filling base image" 69echo 70 71# Fill end of base image with a pattern, skipping every other sector 72io writev $offset 512 1024 32 73 74_check_test_img 75 76echo "Creating test image with backing file" 77echo 78 79TEST_IMG="$TEST_IMG_SAVE" 80_make_test_img -b "$TEST_IMG.base" -F $IMGFMT $image_size 81 82echo "Filling test image" 83echo 84 85# Write every other sector around where the base image ends 86io writev $(( offset + 512 )) 512 1024 64 87 88_check_test_img 89 90echo "Reading" 91echo 92 93# Base image sectors 94io readv $(( offset )) 512 1024 32 95 96# Image sectors 97io readv $(( offset + 512 )) 512 1024 64 98 99# Zero sectors beyond end of base image 100io_zero readv $(( offset + 32 * 1024 )) 512 1024 32 101 102_check_test_img 103 104# Rebase it on top of its base image 105$QEMU_IMG rebase -b "$TEST_IMG.base" -F $IMGFMT "$TEST_IMG" 106 107echo 108echo block-backup 109echo 110 111qemu_comm_method="monitor" 112_launch_qemu -drive file="${TEST_IMG}",cache=${CACHEMODE},aio=${AIOMODE},id=disk 113h=$QEMU_HANDLE 114if [ "${VALGRIND_QEMU}" == "y" ]; then 115 QEMU_COMM_TIMEOUT=7 116else 117 QEMU_COMM_TIMEOUT=1 118fi 119 120TEST_IMG="$TEST_IMG.copy" _make_test_img $image_size 121_send_qemu_cmd $h "drive_backup -n disk ${TEST_IMG}.copy" "(qemu)" \ 122 | _filter_imgfmt 123 124silent=y qemu_cmd_repeat=20 _send_qemu_cmd $h "info block-jobs" "No active jobs" 125_send_qemu_cmd $h "info block-jobs" "No active jobs" 126_send_qemu_cmd $h 'quit' "" 127 128# Base image sectors 129TEST_IMG="${TEST_IMG}.copy" io readv $(( offset )) 512 1024 32 130 131# Image sectors 132TEST_IMG="${TEST_IMG}.copy" io readv $(( offset + 512 )) 512 1024 64 133 134# Zero sectors beyond end of base image 135TEST_IMG="${TEST_IMG}.copy" io_zero readv $(( offset + 32 * 1024 )) 512 1024 32 136 137 138_check_test_img 139 140echo 141echo '=== Reading across backing EOF in one operation ===' 142echo 143 144# Use a cluster boundary as the base end here 145base_size=$((3 * 1024 * 1024 * 1024)) 146 147TEST_IMG="$TEST_IMG.base" _make_test_img $base_size 148_make_test_img -b "$TEST_IMG.base" -F $IMGFMT $image_size 149 150# Write 16 times 42 at the end of the base image 151$QEMU_IO -c "write -P 42 $((base_size - 16)) 16" "$TEST_IMG.base" \ 152 | _filter_qemu_io 153 154# Read 32 bytes across the base EOF from the top; 155# should be 16 times 0x2a, then 16 times 0x00 156$QEMU_IO -c "read -v $((base_size - 16)) 32" "$TEST_IMG" \ 157 | _filter_qemu_io 158 159# success, all done 160echo "*** done" 161rm -f $seq.full 162status=0 163