| #!/usr/bin/env bash |
| # group: rw quick |
| # |
| # Test big discard in qcow2 shrink |
| # |
| # Copyright (c) 2019 Virtuozzo International GmbH. All rights reserved. |
| # |
| # This program is free software; you can redistribute it and/or modify |
| # it under the terms of the GNU General Public License as published by |
| # the Free Software Foundation; either version 2 of the License, or |
| # (at your option) any later version. |
| # |
| # This program is distributed in the hope that it will be useful, |
| # but WITHOUT ANY WARRANTY; without even the implied warranty of |
| # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| # GNU General Public License for more details. |
| # |
| # You should have received a copy of the GNU General Public License |
| # along with this program. If not, see <http://www.gnu.org/licenses/>. |
| # |
| |
| # creator |
| owner=vsementsov@virtuozzo.com |
| |
| seq=`basename $0` |
| echo "QA output created by $seq" |
| |
| status=1 # failure is the default! |
| |
| _cleanup() |
| { |
| _cleanup_test_img |
| } |
| trap "_cleanup; exit \$status" 0 1 2 3 15 |
| |
| # get standard environment, filters and checks |
| . ./common.rc |
| . ./common.filter |
| |
| _supported_fmt qcow2 |
| _supported_proto file fuse |
| _supported_os Linux |
| # This test does not make much sense with external data files |
| _unsupported_imgopts data_file |
| |
| # This test checks that qcow2_process_discards does not truncate a discard |
| # request > 2G. |
| # To reproduce bug we need to overflow int by one sequential discard, so we |
| # need size > 2G, bigger cluster size (as with default 64k we may have maximum |
| # of 512M sequential data, corresponding to one L1 entry), and we need some |
| # data of the beginning of the disk mapped to the end of file to prevent |
| # bdrv_co_truncate(bs->file) call in qcow2_co_truncate(), which might succeed |
| # anyway. |
| |
| disk_usage() |
| { |
| du --block-size=1 $1 | awk '{print $1}' |
| } |
| |
| size=2100M |
| |
| _make_test_img -o "cluster_size=1M,preallocation=metadata" $size |
| $QEMU_IO -c 'discard 0 10M' -c 'discard 2090M 10M' \ |
| -c 'write 2090M 10M' -c 'write 0 10M' "$TEST_IMG" | _filter_qemu_io |
| |
| # Check that our trick with swapping first and last 10M chunks succeeded. |
| # Otherwise test may pass even if bdrv_pdiscard() fails in |
| # qcow2_process_discards() |
| $QEMU_IMG map "$TEST_IMG" | _filter_testdir |
| |
| before=$(disk_usage "$TEST_IMG") |
| $QEMU_IMG resize --shrink "$TEST_IMG" 5M |
| after=$(disk_usage "$TEST_IMG") |
| |
| echo "Disk usage delta: $((before - after))" |
| |
| # success, all done |
| echo "*** done" |
| rm -f $seq.full |
| status=0 |
