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1#!/usr/bin/env bash 2# group: rw auto 3# 4# Test qcow2 image compression 5# 6# Copyright (C) 2018 Igalia, S.L. 7# Author: Alberto Garcia <berto@igalia.com> 8# 9# This program is free software; you can redistribute it and/or modify 10# it under the terms of the GNU General Public License as published by 11# the Free Software Foundation; either version 2 of the License, or 12# (at your option) any later version. 13# 14# This program is distributed in the hope that it will be useful, 15# but WITHOUT ANY WARRANTY; without even the implied warranty of 16# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 17# GNU General Public License for more details. 18# 19# You should have received a copy of the GNU General Public License 20# along with this program. If not, see <http://www.gnu.org/licenses/>. 21# 22 23seq=$(basename "$0") 24echo "QA output created by $seq" 25 26status=1 # failure is the default! 27 28_cleanup() 29{ 30 _cleanup_test_img 31} 32trap "_cleanup; exit \$status" 0 1 2 3 15 33 34# get standard environment, filters and checks 35. ./common.rc 36. ./common.filter 37 38_supported_fmt qcow2 39_supported_proto file fuse 40 41# Repairing the corrupted image requires qemu-img check to store a 42# refcount up to 3, which requires at least two refcount bits. 43# External data files do not support compressed clusters. 44_unsupported_imgopts 'refcount_bits=1[^0-9]' data_file 45 46 47echo 48echo "=== Corrupted size field in compressed cluster descriptor ===" 49echo 50# Create an empty image and fill half of it with compressed data. 51# The L2 entries of the two compressed clusters are located at 52# 0x800000 and 0x800008, their original values are 0x4008000000a00000 53# and 0x4008000000a00802 (5 sectors for compressed data each). 54_make_test_img 8M -o cluster_size=2M 55$QEMU_IO -c "write -c -P 0x11 0 2M" -c "write -c -P 0x11 2M 2M" "$TEST_IMG" \ 56 2>&1 | _filter_qemu_io | _filter_testdir 57 58# Reduce size of compressed data to 4 sectors: this corrupts the image. 59poke_file "$TEST_IMG" $((0x800000)) "\x40\x06" 60$QEMU_IO -c "read -P 0x11 0 4M" "$TEST_IMG" 2>&1 | _filter_qemu_io | _filter_testdir 61 62# 'qemu-img check' however doesn't see anything wrong because it 63# doesn't try to decompress the data and the refcounts are consistent. 64# TODO: update qemu-img so this can be detected. 65_check_test_img 66 67# Increase size of compressed data to the maximum (8192 sectors). 68# This makes QEMU read more data (8192 sectors instead of 5, host 69# addresses [0xa00000, 0xdfffff]), but the decompression algorithm 70# stops once we have enough to restore the uncompressed cluster, so 71# the rest of the data is ignored. 72poke_file "$TEST_IMG" $((0x800000)) "\x7f\xfe" 73# Do it also for the second compressed cluster (L2 entry at 0x800008). 74# In this case the compressed data would span 3 host clusters 75# (host addresses: [0xa00802, 0xe00801]) 76poke_file "$TEST_IMG" $((0x800008)) "\x7f\xfe" 77 78# Here the image is too small so we're asking QEMU to read beyond the 79# end of the image. 80$QEMU_IO -c "read -P 0x11 0 4M" "$TEST_IMG" 2>&1 | _filter_qemu_io | _filter_testdir 81# But if we grow the image we won't be reading beyond its end anymore. 82$QEMU_IO -c "write -P 0x22 4M 4M" "$TEST_IMG" 2>&1 | _filter_qemu_io | _filter_testdir 83$QEMU_IO -c "read -P 0x11 0 4M" "$TEST_IMG" 2>&1 | _filter_qemu_io | _filter_testdir 84 85# The refcount data is however wrong because due to the increased size 86# of the compressed data it now reaches the following host clusters. 87# This can be repaired by qemu-img check by increasing the refcount of 88# those clusters. 89# TODO: update qemu-img to correct the compressed cluster size instead. 90_check_test_img -r all 91$QEMU_IO -c "read -P 0x11 0 4M" "$TEST_IMG" 2>&1 | _filter_qemu_io | _filter_testdir 92$QEMU_IO -c "read -P 0x22 4M 4M" "$TEST_IMG" 2>&1 | _filter_qemu_io | _filter_testdir 93 94echo 95echo "=== Write compressed data of multiple clusters ===" 96echo 97cluster_size=0x10000 98_make_test_img 2M -o cluster_size=$cluster_size 99 100echo "Write uncompressed data:" 101let data_size="8 * $cluster_size" 102$QEMU_IO -c "write -P 0xaa 0 $data_size" "$TEST_IMG" \ 103 2>&1 | _filter_qemu_io | _filter_testdir 104sizeA=$($QEMU_IMG info --output=json "$TEST_IMG" | 105 sed -n '/"actual-size":/ s/[^0-9]//gp') 106 107_make_test_img 2M -o cluster_size=$cluster_size 108echo "Write compressed data:" 109let data_size="3 * $cluster_size + $cluster_size / 2" 110# Set compress on. That will align the written data 111# by the cluster size and will write them compressed. 112QEMU_IO_OPTIONS=$QEMU_IO_OPTIONS_NO_FMT \ 113$QEMU_IO -c "write -P 0xbb 0 $data_size" --image-opts \ 114 "driver=compress,file.driver=$IMGFMT,file.file.driver=file,file.file.filename=$TEST_IMG" \ 115 2>&1 | _filter_qemu_io | _filter_testdir 116 117let offset="4 * $cluster_size + $cluster_size / 4" 118QEMU_IO_OPTIONS=$QEMU_IO_OPTIONS_NO_FMT \ 119$QEMU_IO -c "write -P 0xcc $offset $data_size" "json:{\ 120 'driver': 'compress', 121 'file': {'driver': '$IMGFMT', 122 'file': {'driver': 'file', 123 'filename': '$TEST_IMG'}}}" | \ 124 _filter_qemu_io | _filter_testdir 125 126sizeB=$($QEMU_IMG info --output=json "$TEST_IMG" | 127 sed -n '/"actual-size":/ s/[^0-9]//gp') 128 129if [ $sizeA -lt $sizeB ] 130then 131 echo "Compression ERROR ($sizeA < $sizeB)" 132fi 133 134$QEMU_IMG check --output=json "$TEST_IMG" | 135 sed -n 's/,$//; /"compressed-clusters":/ s/^ *//p' 136 137# success, all done 138echo '*** done' 139rm -f $seq.full 140status=0