1#!/usr/bin/env bash 2# 3# Test case for preallocated zero clusters in qcow2 4# 5# Copyright (C) 2013 Red Hat, Inc. 6# 7# This program is free software; you can redistribute it and/or modify 8# it under the terms of the GNU General Public License as published by 9# the Free Software Foundation; either version 2 of the License, or 10# (at your option) any later version. 11# 12# This program is distributed in the hope that it will be useful, 13# but WITHOUT ANY WARRANTY; without even the implied warranty of 14# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15# GNU General Public License for more details. 16# 17# You should have received a copy of the GNU General Public License 18# along with this program. If not, see <http://www.gnu.org/licenses/>. 19# 20 21# creator 22owner=mreitz@redhat.com 23 24seq="$(basename $0)" 25echo "QA output created by $seq" 26 27status=1 # failure is the default! 28 29_cleanup() 30{ 31 _cleanup_test_img 32} 33trap "_cleanup; exit \$status" 0 1 2 3 15 34 35# get standard environment, filters and checks 36. ./common.rc 37. ./common.filter 38 39# This tests qocw2-specific low-level functionality 40_supported_fmt qcow2 41_supported_proto generic 42 43# Intentionally create an unaligned image 44IMGOPTS="compat=1.1" 45IMG_SIZE=$((64 * 1024 * 1024 + 512)) 46 47echo 48echo "=== Testing cluster discards ===" 49echo 50_make_test_img $IMG_SIZE 51# Write some normal clusters, zero some of them (creating preallocated 52# zero clusters) and discard everything. Everything should now read as 0. 53$QEMU_IO -c "write 0 256k" -c "write -z 0 256k" -c "write 64M 512" \ 54 -c "discard 0 $IMG_SIZE" -c "read -P 0 0 $IMG_SIZE" "$TEST_IMG" \ 55 | _filter_qemu_io 56 57# Check the image (there shouldn't be any leaks) 58_check_test_img 59# Map the image (we want all clusters to be gone) 60$QEMU_IMG map "$TEST_IMG" 61 62_cleanup_test_img 63 64 65echo 66echo '=== Writing to preallocated zero clusters ===' 67echo 68 69_make_test_img $IMG_SIZE 70 71# Create data clusters (not aligned to an L2 table) 72$QEMU_IO -c 'write -P 42 1M 256k' "$TEST_IMG" | _filter_qemu_io 73orig_map=$($QEMU_IMG map --output=json "$TEST_IMG") 74 75# Convert the data clusters to preallocated zero clusters 76$QEMU_IO -c 'write -z 1M 256k' "$TEST_IMG" | _filter_qemu_io 77 78# Now write to them (with a COW needed for the head and tail) 79$QEMU_IO -c "write -P 23 $(((1024 + 32) * 1024)) 192k" "$TEST_IMG" \ 80 | _filter_qemu_io 81 82# Check metadata correctness 83_check_test_img 84 85# Check data correctness 86$QEMU_IO -c "read -P 0 $(( 1024 * 1024)) 32k" \ 87 -c "read -P 23 $(((1024 + 32) * 1024)) 192k" \ 88 -c "read -P 0 $(((1024 + 32 + 192) * 1024)) 32k" \ 89 "$TEST_IMG" \ 90 | _filter_qemu_io 91 92# Check that we have actually reused the original area 93new_map=$($QEMU_IMG map --output=json "$TEST_IMG") 94if [ "$new_map" = "$orig_map" ]; then 95 echo 'Successfully reused original clusters.' 96else 97 echo 'Failed to reuse original clusters.' 98 echo 'Original map:' 99 echo "$orig_map" 100 echo 'New map:' 101 echo "$new_map" 102fi 103 104_cleanup_test_img 105 106 107echo 108echo '=== Writing to a snapshotted preallocated zero cluster ===' 109echo 110 111_make_test_img 64k 112 113# Create a preallocated zero cluster 114$QEMU_IO -c 'write -P 42 0 64k' -c 'write -z 0 64k' "$TEST_IMG" \ 115 | _filter_qemu_io 116 117# Snapshot it 118$QEMU_IMG snapshot -c foo "$TEST_IMG" 119 120# Write to the cluster 121$QEMU_IO -c 'write -P 23 0 64k' "$TEST_IMG" | _filter_qemu_io 122 123# Check metadata correctness 124_check_test_img 125 126# Check data correctness 127$QEMU_IO -c 'read -P 23 0 64k' "$TEST_IMG" | _filter_qemu_io 128$QEMU_IMG snapshot -a foo "$TEST_IMG" 129$QEMU_IO -c 'read -P 0 0 64k' "$TEST_IMG" | _filter_qemu_io 130 131_cleanup_test_img 132 133 134echo 135echo '=== Consecutive write to a preallocated zero cluster ===' 136echo 137 138_make_test_img 192k 139 140# Create three normal clusters 141$QEMU_IO -c 'write -P 42 0 192k' "$TEST_IMG" | _filter_qemu_io 142orig_map=$($QEMU_IMG map --output=json "$TEST_IMG") 143 144# Make the middle cluster a preallocated zero cluster 145$QEMU_IO -c 'write -z 64k 64k' "$TEST_IMG" | _filter_qemu_io 146 147# Try to overwrite everything: This should reuse the whole range. To test that 148# this only issues a single continuous write request, use blkdebug. 149$QEMU_IO -c 'write -P 42 0 192k' \ 150 "json:{ 151 'driver': '$IMGFMT', 152 'file': { 153 'driver': 'blkdebug', 154 'image.filename': '$TEST_IMG', 155 'set-state': [{ 156 'event': 'write_aio', 157 'new_state': 2 158 }], 159 'inject-error': [{ 160 'event': 'write_aio', 161 'state': 2 162 }] 163 } 164 }" \ 165 | _filter_qemu_io 166 167# Check metadata correctness 168_check_test_img 169 170# Check that we have actually reused the original area 171new_map=$($QEMU_IMG map --output=json "$TEST_IMG") 172if [ "$new_map" = "$orig_map" ]; then 173 echo 'Successfully reused original clusters.' 174else 175 echo 'Failed to reuse original clusters.' 176 echo 'Original map:' 177 echo "$orig_map" 178 echo 'New map:' 179 echo "$new_map" 180fi 181 182_cleanup_test_img 183 184 185# success, all done 186echo "*** done" 187rm -f $seq.full 188status=0 189