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This test checks bug in qcow2_process_discards, fixed by previous commit. Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
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#!/usr/bin/env bash | ||
# | ||
# 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/>. | ||
# | ||
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# creator | ||
owner=vsementsov@virtuozzo.com | ||
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seq=`basename $0` | ||
echo "QA output created by $seq" | ||
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status=1 # failure is the default! | ||
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_cleanup() | ||
{ | ||
_cleanup_test_img | ||
} | ||
trap "_cleanup; exit \$status" 0 1 2 3 15 | ||
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# get standard environment, filters and checks | ||
. ./common.rc | ||
. ./common.filter | ||
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_supported_fmt qcow2 | ||
_supported_proto file | ||
_supported_os Linux | ||
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# 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. | ||
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disk_usage() | ||
{ | ||
du --block-size=1 $1 | awk '{print $1}' | ||
} | ||
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size=2100M | ||
IMGOPTS="cluster_size=1M,preallocation=metadata" | ||
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_make_test_img $size | ||
$QEMU_IO -c 'discard 0 10M' -c 'discard 2090M 10M' \ | ||
-c 'write 2090M 10M' -c 'write 0 10M' "$TEST_IMG" | _filter_qemu_io | ||
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# 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 | ||
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before=$(disk_usage "$TEST_IMG") | ||
$QEMU_IMG resize --shrink "$TEST_IMG" 5M | ||
after=$(disk_usage "$TEST_IMG") | ||
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echo "Disk usage delta: $((before - after))" | ||
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# success, all done | ||
echo "*** done" | ||
rm -f $seq.full | ||
status=0 |
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QA output created by 250 | ||
Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=2202009600 preallocation=metadata | ||
discard 10485760/10485760 bytes at offset 0 | ||
10 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec) | ||
discard 10485760/10485760 bytes at offset 2191523840 | ||
10 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec) | ||
wrote 10485760/10485760 bytes at offset 2191523840 | ||
10 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec) | ||
wrote 10485760/10485760 bytes at offset 0 | ||
10 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec) | ||
Offset Length Mapped to File | ||
0 0xa00000 0x82f00000 TEST_DIR/t.qcow2 | ||
0x82a00000 0xa00000 0x500000 TEST_DIR/t.qcow2 | ||
Image resized. | ||
Disk usage delta: 15728640 | ||
*** done |
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