mirror of https://gitee.com/openkylin/qemu.git
81 lines
2.4 KiB
Bash
Executable File
81 lines
2.4 KiB
Bash
Executable File
#!/usr/bin/env bash
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# group: rw quick
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#
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# Test big discard in qcow2 shrink
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#
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# Copyright (c) 2019 Virtuozzo International GmbH. All rights reserved.
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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#
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# creator
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owner=vsementsov@virtuozzo.com
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seq=`basename $0`
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echo "QA output created by $seq"
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status=1 # failure is the default!
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_cleanup()
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{
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_cleanup_test_img
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}
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trap "_cleanup; exit \$status" 0 1 2 3 15
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# get standard environment, filters and checks
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. ./common.rc
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. ./common.filter
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_supported_fmt qcow2
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_supported_proto file fuse
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_supported_os Linux
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# This test does not make much sense with external data files
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_unsupported_imgopts data_file
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# This test checks that qcow2_process_discards does not truncate a discard
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# request > 2G.
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# To reproduce bug we need to overflow int by one sequential discard, so we
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# need size > 2G, bigger cluster size (as with default 64k we may have maximum
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# of 512M sequential data, corresponding to one L1 entry), and we need some
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# data of the beginning of the disk mapped to the end of file to prevent
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# bdrv_co_truncate(bs->file) call in qcow2_co_truncate(), which might succeed
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# anyway.
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disk_usage()
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{
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du --block-size=1 $1 | awk '{print $1}'
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}
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size=2100M
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_make_test_img -o "cluster_size=1M,preallocation=metadata" $size
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$QEMU_IO -c 'discard 0 10M' -c 'discard 2090M 10M' \
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-c 'write 2090M 10M' -c 'write 0 10M' "$TEST_IMG" | _filter_qemu_io
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# Check that our trick with swapping first and last 10M chunks succeeded.
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# Otherwise test may pass even if bdrv_pdiscard() fails in
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# qcow2_process_discards()
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$QEMU_IMG map "$TEST_IMG" | _filter_testdir
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before=$(disk_usage "$TEST_IMG")
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$QEMU_IMG resize --shrink "$TEST_IMG" 5M
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after=$(disk_usage "$TEST_IMG")
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echo "Disk usage delta: $((before - after))"
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# success, all done
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echo "*** done"
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rm -f $seq.full
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status=0
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