1#!/bin/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 $seq" 26 27here="$PWD" 28status=1 # failure is the default! 29 30_cleanup() 31{ 32 _cleanup_test_img 33} 34trap "_cleanup; exit \$status" 0 1 2 3 15 35 36# get standard environment, filters and checks 37. ./common.rc 38. ./common.filter 39 40# This tests qocw2-specific low-level functionality 41_supported_fmt qcow2 42_supported_proto generic 43_supported_os Linux 44 45# Intentionally create an unaligned image 46IMGOPTS="compat=1.1" 47IMG_SIZE=$((64 * 1024 * 1024 + 512)) 48 49echo 50echo "=== Testing cluster discards ===" 51echo 52_make_test_img $IMG_SIZE 53# Write some normal clusters, zero some of them (creating preallocated 54# zero clusters) and discard everything. Everything should now read as 0. 55$QEMU_IO -c "write 0 256k" -c "write -z 0 256k" -c "write 64M 512" \ 56 -c "discard 0 $IMG_SIZE" -c "read -P 0 0 $IMG_SIZE" "$TEST_IMG" \ 57 | _filter_qemu_io 58 59# Check the image (there shouldn't be any leaks) 60_check_test_img 61# Map the image (we want all clusters to be gone) 62$QEMU_IMG map "$TEST_IMG" 63 64_cleanup_test_img 65 66 67echo 68echo '=== Writing to preallocated zero clusters ===' 69echo 70 71_make_test_img $IMG_SIZE 72 73# Create data clusters (not aligned to an L2 table) 74$QEMU_IO -c 'write -P 42 1M 256k' "$TEST_IMG" | _filter_qemu_io 75orig_map=$($QEMU_IMG map --output=json "$TEST_IMG") 76 77# Convert the data clusters to preallocated zero clusters 78$QEMU_IO -c 'write -z 1M 256k' "$TEST_IMG" | _filter_qemu_io 79 80# Now write to them (with a COW needed for the head and tail) 81$QEMU_IO -c "write -P 23 $(((1024 + 32) * 1024)) 192k" "$TEST_IMG" \ 82 | _filter_qemu_io 83 84# Check metadata correctness 85_check_test_img 86 87# Check data correctness 88$QEMU_IO -c "read -P 0 $(( 1024 * 1024)) 32k" \ 89 -c "read -P 23 $(((1024 + 32) * 1024)) 192k" \ 90 -c "read -P 0 $(((1024 + 32 + 192) * 1024)) 32k" \ 91 "$TEST_IMG" \ 92 | _filter_qemu_io 93 94# Check that we have actually reused the original area 95new_map=$($QEMU_IMG map --output=json "$TEST_IMG") 96if [ "$new_map" = "$orig_map" ]; then 97 echo 'Successfully reused original clusters.' 98else 99 echo 'Failed to reuse original clusters.' 100 echo 'Original map:' 101 echo "$orig_map" 102 echo 'New map:' 103 echo "$new_map" 104fi 105 106_cleanup_test_img 107 108 109echo 110echo '=== Writing to a snapshotted preallocated zero cluster ===' 111echo 112 113_make_test_img 64k 114 115# Create a preallocated zero cluster 116$QEMU_IO -c 'write -P 42 0 64k' -c 'write -z 0 64k' "$TEST_IMG" \ 117 | _filter_qemu_io 118 119# Snapshot it 120$QEMU_IMG snapshot -c foo "$TEST_IMG" 121 122# Write to the cluster 123$QEMU_IO -c 'write -P 23 0 64k' "$TEST_IMG" | _filter_qemu_io 124 125# Check metadata correctness 126_check_test_img 127 128# Check data correctness 129$QEMU_IO -c 'read -P 23 0 64k' "$TEST_IMG" | _filter_qemu_io 130$QEMU_IMG snapshot -a foo "$TEST_IMG" 131$QEMU_IO -c 'read -P 0 0 64k' "$TEST_IMG" | _filter_qemu_io 132 133_cleanup_test_img 134 135 136echo 137echo '=== Consecutive write to a preallocated zero cluster ===' 138echo 139 140_make_test_img 192k 141 142# Create three normal clusters 143$QEMU_IO -c 'write -P 42 0 192k' "$TEST_IMG" | _filter_qemu_io 144orig_map=$($QEMU_IMG map --output=json "$TEST_IMG") 145 146# Make the middle cluster a preallocated zero cluster 147$QEMU_IO -c 'write -z 64k 64k' "$TEST_IMG" | _filter_qemu_io 148 149# Try to overwrite everything: This should reuse the whole range. To test that 150# this only issues a single continuous write request, use blkdebug. 151$QEMU_IO -c 'write -P 42 0 192k' \ 152 "json:{ 153 'driver': '$IMGFMT', 154 'file': { 155 'driver': 'blkdebug', 156 'image.filename': '$TEST_IMG', 157 'set-state': [{ 158 'event': 'write_aio', 159 'new_state': 2 160 }], 161 'inject-error': [{ 162 'event': 'write_aio', 163 'state': 2 164 }] 165 } 166 }" \ 167 | _filter_qemu_io 168 169# Check metadata correctness 170_check_test_img 171 172# Check that we have actually reused the original area 173new_map=$($QEMU_IMG map --output=json "$TEST_IMG") 174if [ "$new_map" = "$orig_map" ]; then 175 echo 'Successfully reused original clusters.' 176else 177 echo 'Failed to reuse original clusters.' 178 echo 'Original map:' 179 echo "$orig_map" 180 echo 'New map:' 181 echo "$new_map" 182fi 183 184_cleanup_test_img 185 186 187# success, all done 188echo "*** done" 189rm -f $seq.full 190status=0 191