1#!/usr/bin/env bash 2# 3# Test big discard in qcow2 shrink 4# 5# Copyright (c) 2019 Virtuozzo International GmbH. All rights reserved. 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=vsementsov@virtuozzo.com 23 24seq=`basename $0` 25echo "QA output created by $seq" 26 27status=1 # failure is the default! 28 29_cleanup() 30{ 31 _cleanup_test_img 32} 33trap "_cleanup; exit \$status" 0 1 2 3 15 34 35# get standard environment, filters and checks 36. ./common.rc 37. ./common.filter 38 39_supported_fmt qcow2 40_supported_proto file 41_supported_os Linux 42 43# This test checks that qcow2_process_discards does not truncate a discard 44# request > 2G. 45# To reproduce bug we need to overflow int by one sequential discard, so we 46# need size > 2G, bigger cluster size (as with default 64k we may have maximum 47# of 512M sequential data, corresponding to one L1 entry), and we need some 48# data of the beginning of the disk mapped to the end of file to prevent 49# bdrv_co_truncate(bs->file) call in qcow2_co_truncate(), which might succeed 50# anyway. 51 52disk_usage() 53{ 54 du --block-size=1 $1 | awk '{print $1}' 55} 56 57size=2100M 58IMGOPTS="cluster_size=1M,preallocation=metadata" 59 60_make_test_img $size 61$QEMU_IO -c 'discard 0 10M' -c 'discard 2090M 10M' \ 62 -c 'write 2090M 10M' -c 'write 0 10M' "$TEST_IMG" | _filter_qemu_io 63 64# Check that our trick with swapping first and last 10M chunks succeeded. 65# Otherwise test may pass even if bdrv_pdiscard() fails in 66# qcow2_process_discards() 67$QEMU_IMG map "$TEST_IMG" | _filter_testdir 68 69before=$(disk_usage "$TEST_IMG") 70$QEMU_IMG resize --shrink "$TEST_IMG" 5M 71after=$(disk_usage "$TEST_IMG") 72 73echo "Disk usage delta: $((before - after))" 74 75# success, all done 76echo "*** done" 77rm -f $seq.full 78status=0 79