1#!/usr/bin/env bash 2# 3# Test compressed write to a qcow2 image at an offset above 4 GB 4# 5# Copyright (C) 2019 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 21seq=$(basename "$0") 22echo "QA output created by $seq" 23 24status=1 # failure is the default! 25 26_cleanup() 27{ 28 _cleanup_test_img 29} 30trap "_cleanup; exit \$status" 0 1 2 3 15 31 32# get standard environment, filters and checks 33. ./common.rc 34. ./common.filter 35 36# This is a qcow2 regression test 37_supported_fmt qcow2 38_supported_proto file fuse 39 40# External data files do not support compression; 41# We need an exact cluster size (2M) and refcount width (2) so we can 42# get this test quickly over with; and this in turn require 43# compat=1.1 44_unsupported_imgopts data_file cluster_size refcount_bits 'compat=0.10' 45 46# The idea is: Create an empty file, mark the first 4 GB as used, then 47# do a compressed write that thus must be put beyond 4 GB. 48# (This used to fail because the compressed sector mask was just a 49# 32 bit mask, so qemu-img check will count a cluster before 4 GB as 50# referenced twice.) 51 52# We would like to use refcount_bits=1 here, but then qemu-img check 53# will throw an error when trying to count a cluster as referenced 54# twice. 55_make_test_img -o cluster_size=2M,refcount_bits=2 64M 56 57reft_offs=$(peek_file_be "$TEST_IMG" 48 8) 58refb_offs=$(peek_file_be "$TEST_IMG" $reft_offs 8) 59 60# We want to cover 4 GB, those are 2048 clusters, equivalent to 61# 4096 bit = 512 B. 62truncate -s 4G "$TEST_IMG" 63for ((in_refb_offs = 0; in_refb_offs < 512; in_refb_offs += 8)); do 64 poke_file "$TEST_IMG" $((refb_offs + in_refb_offs)) \ 65 '\x55\x55\x55\x55\x55\x55\x55\x55' 66done 67 68$QEMU_IO -c 'write -c -P 42 0 2M' "$TEST_IMG" | _filter_qemu_io 69 70echo 71echo '--- Check ---' 72 73# This should only print the leaked clusters in the first 4 GB 74_check_test_img | grep -v '^Leaked cluster ' 75 76# success, all done 77echo "*** done" 78rm -f $seq.full 79status=0 80