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84 lines
2.7 KiB
Plaintext
84 lines
2.7 KiB
Plaintext
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#!/usr/bin/env bash
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#
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# Test large write to a qcow2 image
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#
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# Copyright (C) 2019 Red Hat, Inc.
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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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seq=$(basename "$0")
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echo "QA output created by $seq"
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status=1 # failure is the default!
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_cleanup()
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{
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_cleanup_test_img
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}
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trap "_cleanup; exit \$status" 0 1 2 3 15
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# get standard environment, filters and checks
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. ./common.rc
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. ./common.filter
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# This is a qcow2 regression test
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_supported_fmt qcow2
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_supported_proto file
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_supported_os Linux
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# We use our own external data file and our own cluster size, and we
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# require v3 images
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_unsupported_imgopts data_file cluster_size 'compat=0.10'
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# We need a backing file so that handle_alloc_space() will not do
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# anything. (If it were to do anything, it would simply fail its
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# write-zeroes request because the request range is too large.)
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TEST_IMG="$TEST_IMG.base" _make_test_img 4G
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$QEMU_IO -c 'write 0 512' "$TEST_IMG.base" | _filter_qemu_io
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# (Use .orig because _cleanup_test_img will remove that file)
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# We need a large cluster size, see below for why (above the $QEMU_IO
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# invocation)
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_make_test_img -o cluster_size=2M,data_file="$TEST_IMG.orig" \
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-b "$TEST_IMG.base" 4G
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# We want a null-co as the data file, because it allows us to quickly
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# "write" 2G of data without using any space.
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# (qemu-img create does not like it, though, because null-co does not
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# support image creation.)
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$QEMU_IMG amend -o data_file="json:{'driver':'null-co',,'size':'4294967296'}" \
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"$TEST_IMG"
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# This gives us a range of:
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# 2^31 - 512 + 768 - 1 = 2^31 + 255 > 2^31
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# until the beginning of the end COW block. (The total allocation
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# size depends on the cluster size, but all that is important is that
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# it exceeds INT_MAX.)
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#
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# 2^31 - 512 is the maximum request size. We want this to result in a
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# single allocation, and because the qcow2 driver splits allocations
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# on L2 boundaries, we need large L2 tables; hence the cluster size of
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# 2 MB. (Anything from 256 kB should work, though, because then one L2
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# table covers 8 GB.)
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$QEMU_IO -c "write 768 $((2 ** 31 - 512))" "$TEST_IMG" | _filter_qemu_io
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_check_test_img
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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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