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e4d7019e1a
After commit f01643fb8b when an image is
extended and BDRV_REQ_ZERO_WRITE is set then the new clusters are
zeroized.
The code however does not detect correctly situations when the old and
the new end of the image are within the same cluster. The problem can
be reproduced with these steps:
qemu-img create -f qcow2 backing.qcow2 1M
qemu-img create -f qcow2 -F qcow2 -b backing.qcow2 top.qcow2
qemu-img resize --shrink top.qcow2 520k
qemu-img resize top.qcow2 567k
In the last step offset - zero_start causes an integer wraparound.
Signed-off-by: Alberto Garcia <berto@igalia.com>
Message-Id: <20200504155217.10325-1-berto@igalia.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
74 lines
2.0 KiB
Bash
Executable File
74 lines
2.0 KiB
Bash
Executable File
#!/usr/bin/env bash
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#
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# Test resizing a qcow2 image with a backing file
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#
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# Copyright (C) 2020 Igalia, S.L.
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# Author: Alberto Garcia <berto@igalia.com>
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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=berto@igalia.com
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seq=`basename $0`
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echo "QA output created by $seq"
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status=1 # failure is the default!
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_cleanup()
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{
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_cleanup_test_img
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}
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trap "_cleanup; exit \$status" 0 1 2 3 15
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# get standard environment, filters and checks
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. ./common.rc
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. ./common.filter
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_supported_fmt qcow2
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_supported_proto file
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_supported_os Linux
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echo '### Create the backing image'
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BACKING_IMG="$TEST_IMG.base"
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TEST_IMG="$BACKING_IMG" _make_test_img 1M
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echo '### Fill the backing image with data (0x11)'
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$QEMU_IO -c 'write -P 0x11 0 1M' "$BACKING_IMG" | _filter_qemu_io
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echo '### Create the top image'
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_make_test_img -F "$IMGFMT" -b "$BACKING_IMG"
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echo '### Fill the top image with data (0x22)'
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$QEMU_IO -c 'write -P 0x22 0 1M' "$TEST_IMG" | _filter_qemu_io
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# Both offsets are part of the same cluster.
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echo '### Shrink the image to 520k'
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$QEMU_IMG resize --shrink "$TEST_IMG" 520k
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echo '### Grow the image to 567k'
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$QEMU_IMG resize "$TEST_IMG" 567k
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echo '### Check that the tail of the image reads as zeroes'
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$QEMU_IO -c 'read -P 0x22 0 520k' "$TEST_IMG" | _filter_qemu_io
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$QEMU_IO -c 'read -P 0x00 520k 47k' "$TEST_IMG" | _filter_qemu_io
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echo '### Show output of qemu-img map'
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$QEMU_IMG map "$TEST_IMG" | _filter_testdir
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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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