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3dd3e248 VSO |
1 | #!/usr/bin/env bash |
2 | # | |
3 | # Test big discard in qcow2 shrink | |
4 | # | |
5 | # Copyright (c) 2019 Virtuozzo International GmbH. All rights reserved. | |
6 | # | |
7 | # This program is free software; you can redistribute it and/or modify | |
8 | # it under the terms of the GNU General Public License as published by | |
9 | # the Free Software Foundation; either version 2 of the License, or | |
10 | # (at your option) any later version. | |
11 | # | |
12 | # This program is distributed in the hope that it will be useful, | |
13 | # but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | # GNU General Public License for more details. | |
16 | # | |
17 | # You should have received a copy of the GNU General Public License | |
18 | # along with this program. If not, see <http://www.gnu.org/licenses/>. | |
19 | # | |
20 | ||
21 | # creator | |
22 | owner=vsementsov@virtuozzo.com | |
23 | ||
24 | seq=`basename $0` | |
25 | echo "QA output created by $seq" | |
26 | ||
27 | status=1 # failure is the default! | |
28 | ||
29 | _cleanup() | |
30 | { | |
31 | _cleanup_test_img | |
32 | } | |
33 | trap "_cleanup; exit \$status" 0 1 2 3 15 | |
34 | ||
35 | # get standard environment, filters and checks | |
36 | . ./common.rc | |
37 | . ./common.filter | |
38 | ||
39 | _supported_fmt qcow2 | |
40 | _supported_proto file | |
41 | _supported_os Linux | |
3be2024a HR |
42 | # This test does not make much sense with external data files |
43 | _unsupported_imgopts data_file | |
3dd3e248 VSO |
44 | |
45 | # This test checks that qcow2_process_discards does not truncate a discard | |
46 | # request > 2G. | |
47 | # To reproduce bug we need to overflow int by one sequential discard, so we | |
48 | # need size > 2G, bigger cluster size (as with default 64k we may have maximum | |
49 | # of 512M sequential data, corresponding to one L1 entry), and we need some | |
50 | # data of the beginning of the disk mapped to the end of file to prevent | |
51 | # bdrv_co_truncate(bs->file) call in qcow2_co_truncate(), which might succeed | |
52 | # anyway. | |
53 | ||
54 | disk_usage() | |
55 | { | |
56 | du --block-size=1 $1 | awk '{print $1}' | |
57 | } | |
58 | ||
59 | size=2100M | |
3dd3e248 | 60 | |
407fb56a | 61 | _make_test_img -o "cluster_size=1M,preallocation=metadata" $size |
3dd3e248 VSO |
62 | $QEMU_IO -c 'discard 0 10M' -c 'discard 2090M 10M' \ |
63 | -c 'write 2090M 10M' -c 'write 0 10M' "$TEST_IMG" | _filter_qemu_io | |
64 | ||
65 | # Check that our trick with swapping first and last 10M chunks succeeded. | |
66 | # Otherwise test may pass even if bdrv_pdiscard() fails in | |
67 | # qcow2_process_discards() | |
68 | $QEMU_IMG map "$TEST_IMG" | _filter_testdir | |
69 | ||
70 | before=$(disk_usage "$TEST_IMG") | |
71 | $QEMU_IMG resize --shrink "$TEST_IMG" 5M | |
72 | after=$(disk_usage "$TEST_IMG") | |
73 | ||
74 | echo "Disk usage delta: $((before - after))" | |
75 | ||
76 | # success, all done | |
77 | echo "*** done" | |
78 | rm -f $seq.full | |
79 | status=0 |