2807746ff1
The contents of a qcow2 bitmap are rounded up to a size that
matches the number of bits available for the granularity, but
that granularity differs for 32-bit hosts (our default 64k
cluster allows for 2M bitmap coverage per 'long') and 64-bit
hosts (4M bitmap per 'long'). If the image is a multiple of
2M but not 4M, then the number of bytes occupied by the array
of longs in memory differs between architecture, thus
resulting in different SHA256 hashes.
Furthermore (but untested by me), if our computation of the
SHA256 hash is at all endian-dependent because of how we store
data in memory, that's another variable we'd have to account
for (ideally, we specified the bitmap stored in qcow2 as
fixed-endian on disk, because the same qcow2 file must be
usable across any architecture; but that says nothing about
how we represent things in memory). But we already have test
165 to validate that bitmaps are stored correctly on disk,
while this test is merely testing that the bitmap exists.
So for this test, the easiest solution is to filter out the
actual hash value. Broken in commit 4096974e.
Reported-by: Max Reitz <mreitz@redhat.com>
Signed-off-by: Eric Blake <eblake@redhat.com>
Message-id: 20171117190422.23626-1-eblake@redhat.com
Reviewed-by: John Snow <jsnow@redhat.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
Signed-off-by: Max Reitz <mreitz@redhat.com>
174 lines
6 KiB
Bash
Executable file
174 lines
6 KiB
Bash
Executable file
#!/bin/bash
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#
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# Commit changes into backing chains and empty the top image if the
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# backing image is not explicitly specified.
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#
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# Variant of 097, which includes snapshots and persistent bitmaps, to
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# tickle the slow codepath in qcow2. See also 198, for another feature
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# that tickles the slow codepath.
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#
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# Copyright (C) 2014, 2017 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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# creator
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owner=mreitz@redhat.com
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seq="$(basename $0)"
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echo "QA output created by $seq"
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here="$PWD"
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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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_rm_test_img "$TEST_IMG.itmd"
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}
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trap "_cleanup; exit \$status" 0 1 2 3 15
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# get standard environment, filters and checks
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. ./common.rc
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. ./common.filter
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. ./common.pattern
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# This test is specific to qcow2
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_supported_fmt qcow2
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_supported_proto file
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_supported_os Linux
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function run_qemu()
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{
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$QEMU -nographic -qmp stdio -serial none "$@" 2>&1 \
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| _filter_testdir | _filter_qmp | _filter_qemu \
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| sed 's/"sha256": ".\{64\}"/"sha256": HASH/'
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}
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for reason in snapshot bitmap; do
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# Four passes:
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# 0: Two-layer backing chain, commit to upper backing file (implicitly)
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# (in this case, the top image will be emptied)
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# 1: Two-layer backing chain, commit to upper backing file (explicitly)
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# (in this case, the top image will implicitly stay unchanged)
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# 2: Two-layer backing chain, commit to upper backing file (implicitly with -d)
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# (in this case, the top image will explicitly stay unchanged)
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# 3: Two-layer backing chain, commit to lower backing file
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# (in this case, the top image will implicitly stay unchanged)
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#
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# 020 already tests committing, so this only tests whether image chains are
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# working properly and that all images above the base are emptied; therefore,
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# no complicated patterns are necessary. Check near the 2G mark, as qcow2
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# has been buggy at that boundary in the past.
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for i in 0 1 2 3; do
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echo
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echo "=== Test pass $reason.$i ==="
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echo
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len=$((2100 * 1024 * 1024 + 512)) # larger than 2G, and not cluster aligned
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TEST_IMG="$TEST_IMG.base" _make_test_img $len
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TEST_IMG="$TEST_IMG.itmd" _make_test_img -b "$TEST_IMG.base" $len
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_make_test_img -b "$TEST_IMG.itmd" $len
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# Update the top image to use a feature that is incompatible with fast path
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case $reason in
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snapshot) $QEMU_IMG snapshot -c snap "$TEST_IMG" ;;
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bitmap)
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run_qemu <<EOF
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{ "execute": "qmp_capabilities" }
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{ "execute": "blockdev-add",
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"arguments": { "driver": "qcow2", "node-name": "drive0",
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"file": { "driver": "file", "filename": "$TEST_IMG" } } }
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{ "execute": "block-dirty-bitmap-add",
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"arguments": { "node": "drive0", "name": "bitmap0",
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"persistent": true, "autoload": true } }
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{ "execute": "quit" }
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EOF
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;;
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esac
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$QEMU_IO -c "write -P 1 0x7ffd0000 192k" "$TEST_IMG.base" | _filter_qemu_io
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$QEMU_IO -c "write -P 2 0x7ffe0000 128k" "$TEST_IMG.itmd" | _filter_qemu_io
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$QEMU_IO -c "write -P 3 0x7fff0000 64k" "$TEST_IMG" | _filter_qemu_io
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$QEMU_IO -c "write -P 4 $(($len - 512)) 512" "$TEST_IMG" | _filter_qemu_io
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if [ $i -lt 3 ]; then
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if [ $i == 0 ]; then
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# -b "$TEST_IMG.itmd" should be the default (that is, committing to the
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# first backing file in the chain)
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$QEMU_IMG commit "$TEST_IMG"
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elif [ $i == 1 ]; then
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# explicitly specify the commit target (this should imply -d)
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$QEMU_IMG commit -b "$TEST_IMG.itmd" "$TEST_IMG"
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else
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# do not explicitly specify the commit target, but use -d to leave the
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# top image unchanged
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$QEMU_IMG commit -d "$TEST_IMG"
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fi
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# Bottom should be unchanged
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$QEMU_IO -c 'read -P 1 0x7ffd0000 192k' "$TEST_IMG.base" | _filter_qemu_io
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$QEMU_IO -c "read -P 0 $((len - 512)) 512" "$TEST_IMG.base" | _filter_qemu_io
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# Intermediate should contain changes from top
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$QEMU_IO -c 'read -P 1 0x7ffd0000 64k' "$TEST_IMG.itmd" | _filter_qemu_io
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$QEMU_IO -c 'read -P 2 0x7ffe0000 64k' "$TEST_IMG.itmd" | _filter_qemu_io
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$QEMU_IO -c 'read -P 3 0x7fff0000 64k' "$TEST_IMG.itmd" | _filter_qemu_io
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$QEMU_IO -c "read -P 4 $((len - 512)) 512" "$TEST_IMG.itmd" | _filter_qemu_io
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# And in pass 0, the top image should be empty, whereas in both other passes
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# it should be unchanged (which is both checked by qemu-img map)
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else
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$QEMU_IMG commit -b "$TEST_IMG.base" "$TEST_IMG"
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# Bottom should contain all changes
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$QEMU_IO -c 'read -P 1 0x7ffd0000 64k' "$TEST_IMG.base" | _filter_qemu_io
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$QEMU_IO -c 'read -P 2 0x7ffe0000 64k' "$TEST_IMG.base" | _filter_qemu_io
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$QEMU_IO -c 'read -P 3 0x7fff0000 64k' "$TEST_IMG.base" | _filter_qemu_io
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$QEMU_IO -c "read -P 4 $((len - 512)) 512" "$TEST_IMG.base" | _filter_qemu_io
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# Both top and intermediate should be unchanged
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fi
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$QEMU_IMG map "$TEST_IMG.base" | _filter_qemu_img_map
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$QEMU_IMG map "$TEST_IMG.itmd" | _filter_qemu_img_map
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$QEMU_IMG map "$TEST_IMG" | _filter_qemu_img_map
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# Check that the reason for slow path is still present, as appropriate
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case $reason in
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snapshot)
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$QEMU_IMG snapshot -l "$TEST_IMG" |
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sed 's/^\(.\{20\}\).*/\1/; s/ *$//' ;;
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bitmap)
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run_qemu <<EOF
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{ "execute": "qmp_capabilities" }
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{ "execute": "blockdev-add",
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"arguments": { "driver": "qcow2", "node-name": "drive0",
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"file": { "driver": "file", "filename": "$TEST_IMG" } } }
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{ "execute": "x-debug-block-dirty-bitmap-sha256",
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"arguments": { "node": "drive0", "name": "bitmap0" } }
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{ "execute": "quit" }
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EOF
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;;
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esac
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done
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done
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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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