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1#!/usr/bin/env bash 2# group: rw quick 3# 4# Test big discard in qcow2 shrink 5# 6# Copyright (c) 2019 Virtuozzo International GmbH. All rights reserved. 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 22# creator 23owner=vsementsov@virtuozzo.com 24 25seq=`basename $0` 26echo "QA output created by $seq" 27 28status=1 # failure is the default! 29 30_cleanup() 31{ 32 _cleanup_test_img 33} 34trap "_cleanup; exit \$status" 0 1 2 3 15 35 36# get standard environment, filters and checks 37. ./common.rc 38. ./common.filter 39 40_supported_fmt qcow2 41_supported_proto file fuse 42_supported_os Linux 43# This test does not make much sense with external data files 44_unsupported_imgopts data_file 45 46# This test checks that qcow2_process_discards does not truncate a discard 47# request > 2G. 48# To reproduce bug we need to overflow int by one sequential discard, so we 49# need size > 2G, bigger cluster size (as with default 64k we may have maximum 50# of 512M sequential data, corresponding to one L1 entry), and we need some 51# data of the beginning of the disk mapped to the end of file to prevent 52# bdrv_co_truncate(bs->file) call in qcow2_co_truncate(), which might succeed 53# anyway. 54 55disk_usage() 56{ 57 du --block-size=1 $1 | awk '{print $1}' 58} 59 60size=2100M 61 62_make_test_img -o "cluster_size=1M,preallocation=metadata" $size 63$QEMU_IO -c 'discard 0 10M' -c 'discard 2090M 10M' \ 64 -c 'write 2090M 10M' -c 'write 0 10M' "$TEST_IMG" | _filter_qemu_io 65 66# Check that our trick with swapping first and last 10M chunks succeeded. 67# Otherwise test may pass even if bdrv_pdiscard() fails in 68# qcow2_process_discards() 69$QEMU_IMG map "$TEST_IMG" | _filter_testdir 70 71before=$(disk_usage "$TEST_IMG") 72$QEMU_IMG resize --shrink "$TEST_IMG" 5M 73after=$(disk_usage "$TEST_IMG") 74 75echo "Disk usage delta: $((before - after))" 76 77# success, all done 78echo "*** done" 79rm -f $seq.full 80status=0