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1#!/usr/bin/env bash 2# group: rw auto quick 3# 4# Test for the regression fixed in commit c8bf9a9169 5# 6# Copyright (C) 2020 Igalia, S.L. 7# Author: Alberto Garcia <berto@igalia.com> 8# Based on a test case by Maxim Levitsky <mlevitsk@redhat.com> 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=berto@igalia.com 26 27seq=`basename $0` 28echo "QA output created by $seq" 29 30status=1 # failure is the default! 31 32_cleanup() 33{ 34 _cleanup_test_img 35} 36trap "_cleanup; exit \$status" 0 1 2 3 15 37 38# get standard environment, filters and checks 39. ./common.rc 40. ./common.filter 41 42_supported_fmt qcow2 43_supported_proto file 44_supported_os Linux 45_unsupported_imgopts cluster_size refcount_bits extended_l2 compat=0.10 data_file 46 47# The cluster size must be at least the granularity of the mirror job (4KB) 48# Note that larger cluster sizes will produce very large images (several GBs) 49cluster_size=4096 50refcount_bits=64 # Make it equal to the L2 entry size for convenience 51options="cluster_size=${cluster_size},refcount_bits=${refcount_bits}" 52 53# Number of refcount entries per refcount blocks 54ref_entries=$(( ${cluster_size} * 8 / ${refcount_bits} )) 55 56# Number of data clusters needed to fill a refcount block 57# Equals ${ref_entries} minus two (one L2 table and one refcount block) 58data_clusters_per_refblock=$(( ${ref_entries} - 2 )) 59 60# Number of entries in the refcount cache 61ref_blocks=4 62 63# Write enough data clusters to fill the refcount cache and allocate 64# one more refcount block. 65# Subtract 3 clusters from the total: qcow2 header, refcount table, L1 table 66total_data_clusters=$(( ${data_clusters_per_refblock} * ${ref_blocks} + 1 - 3 )) 67 68# Total size to write in bytes 69total_size=$(( ${total_data_clusters} * ${cluster_size} )) 70 71echo 72echo '### Create the image' 73echo 74TEST_IMG_FILE=$TEST_IMG.base _make_test_img -o $options $total_size | _filter_img_create_size 75 76echo 77echo '### Write data to allocate more refcount blocks than the cache can hold' 78echo 79$QEMU_IO -c "write -P 1 0 $total_size" $TEST_IMG.base | _filter_qemu_io 80 81echo 82echo '### Create an overlay' 83echo 84_make_test_img -F $IMGFMT -b $TEST_IMG.base -o $options | _filter_img_create_size 85 86echo 87echo '### Fill the overlay with zeroes' 88echo 89$QEMU_IO -c "write -z 0 $total_size" $TEST_IMG | _filter_qemu_io 90 91echo 92echo '### Commit changes to the base image' 93echo 94$QEMU_IMG commit $TEST_IMG 95 96echo 97echo '### Check the base image' 98echo 99$QEMU_IMG check $TEST_IMG.base 100 101# success, all done 102echo "*** done" 103rm -f $seq.full 104status=0