| 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 | size=2100M |
| 56 | |
| 57 | _make_test_img -o "cluster_size=1M,preallocation=metadata" $size |
| 58 | $QEMU_IO -c 'discard 0 10M' -c 'discard 2090M 10M' \ |
| 59 | -c 'write 2090M 10M' -c 'write 0 10M' "$TEST_IMG" | _filter_qemu_io |
| 60 | |
| 61 | # Check that our trick with swapping first and last 10M chunks succeeded. |
| 62 | # Otherwise test may pass even if bdrv_pdiscard() fails in |
| 63 | # qcow2_process_discards() |
| 64 | $QEMU_IMG map "$TEST_IMG" | _filter_testdir |
| 65 | |
| 66 | before=$(disk_usage "$TEST_IMG") |
| 67 | $QEMU_IMG resize --shrink "$TEST_IMG" 5M |
| 68 | after=$(disk_usage "$TEST_IMG") |
| 69 | |
| 70 | echo "Disk usage delta: $((before - after))" |
| 71 | |
| 72 | # success, all done |
| 73 | echo "*** done" |
| 74 | rm -f $seq.full |
| 75 | status=0 |