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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 23 owner=v.sementsov-og@mail.ru 24 25 seq=`basename $0` 26 echo "QA output created by $seq" 27 28 status=1 # failure is the default! 29 30 _cleanup() 31 { 32 _cleanup_test_img 33 } 34 trap "_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 55 disk_usage() 56 { 57 du --block-size=1 $1 | awk '{print $1}' 58 } 59 60 size=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 71 before=$(disk_usage "$TEST_IMG") 72 $QEMU_IMG resize --shrink "$TEST_IMG" 5M 73 after=$(disk_usage "$TEST_IMG") 74 75 echo "Disk usage delta: $((before - after))" 76 77 # success, all done 78 echo "*** done" 79 rm -f $seq.full 80 status=0