4 # Test big discard in qcow2 shrink
6 # Copyright (c) 2019 Virtuozzo International GmbH. All rights reserved.
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
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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.
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23 owner=v.sementsov-og@mail.ru
26 echo "QA output created by $seq"
28 status=1 # failure is the default!
34 trap "_cleanup; exit \$status" 0 1 2 3 15
36 # get standard environment, filters and checks
41 _supported_proto file fuse
43 # This test does not make much sense with external data files
44 _unsupported_imgopts data_file
46 # This test checks that qcow2_process_discards does not truncate a discard
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
57 du --block-size=1 $1 | awk '{print $1}'
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
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
71 before=$(disk_usage "$TEST_IMG")
72 $QEMU_IMG resize --shrink "$TEST_IMG" 5M
73 after=$(disk_usage "$TEST_IMG")
75 echo "Disk usage delta: $((before - after))"