1#!/usr/bin/env bash 2# group: rw 3# 4# Test compressed write to a qcow2 image at an offset above 4 GB 5# 6# Copyright (C) 2019 Red Hat, Inc. 7# 8# This program is free software; you can redistribute it and/or modify 9# it under the terms of the GNU General Public License as published by 10# the Free Software Foundation; either version 2 of the License, or 11# (at your option) any later version. 12# 13# This program is distributed in the hope that it will be useful, 14# but WITHOUT ANY WARRANTY; without even the implied warranty of 15# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16# GNU General Public License for more details. 17# 18# You should have received a copy of the GNU General Public License 19# along with this program. If not, see <http://www.gnu.org/licenses/>. 20# 21 22seq=$(basename "$0") 23echo "QA output created by $seq" 24 25status=1 # failure is the default! 26 27_cleanup() 28{ 29 _cleanup_test_img 30} 31trap "_cleanup; exit \$status" 0 1 2 3 15 32 33# get standard environment, filters and checks 34. ./common.rc 35. ./common.filter 36 37# This is a qcow2 regression test 38_supported_fmt qcow2 39_supported_proto file fuse 40 41# External data files do not support compression; 42# We need an exact cluster size (2M) and refcount width (2) so we can 43# get this test quickly over with; and this in turn require 44# compat=1.1 45_unsupported_imgopts data_file cluster_size refcount_bits 'compat=0.10' 46 47# The idea is: Create an empty file, mark the first 4 GB as used, then 48# do a compressed write that thus must be put beyond 4 GB. 49# (This used to fail because the compressed sector mask was just a 50# 32 bit mask, so qemu-img check will count a cluster before 4 GB as 51# referenced twice.) 52 53# We would like to use refcount_bits=1 here, but then qemu-img check 54# will throw an error when trying to count a cluster as referenced 55# twice. 56_make_test_img -o cluster_size=2M,refcount_bits=2 64M 57 58reft_offs=$(peek_file_be "$TEST_IMG" 48 8) 59refb_offs=$(peek_file_be "$TEST_IMG" $reft_offs 8) 60 61# We want to cover 4 GB, those are 2048 clusters, equivalent to 62# 4096 bit = 512 B. 63truncate -s 4G "$TEST_IMG" 64for ((in_refb_offs = 0; in_refb_offs < 512; in_refb_offs += 8)); do 65 poke_file "$TEST_IMG" $((refb_offs + in_refb_offs)) \ 66 '\x55\x55\x55\x55\x55\x55\x55\x55' 67done 68 69$QEMU_IO -c 'write -c -P 42 0 2M' "$TEST_IMG" | _filter_qemu_io 70 71echo 72echo '--- Check ---' 73 74# This should only print the leaked clusters in the first 4 GB 75_check_test_img | grep -v '^Leaked cluster ' 76 77# success, all done 78echo "*** done" 79rm -f $seq.full 80status=0 81