| #!/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=v.sementsov-og@mail.ru | |
| 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. | |
| 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 |