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2ec7e8a946
Three test cases:
(1) Adding a qcow2 (metadata) file to an existing data file, see whether
we can read the existing data through the qcow2 image.
(2) Append data to the data file, grow the qcow2 image accordingly, see
whether we can read the new data through the qcow2 image.
(3) At runtime, add a backing image to a freshly created qcow2 image
with an external data file (with data-file-raw). Reading data from
the qcow2 image must return the same result as reading data from the
data file, so everything in the backing image must be ignored.
(This did not use to be the case, because without the L2 tables
preallocated, all clusters would appear as unallocated, and so the
qcow2 driver would fall through to the backing file.)
Signed-off-by: Max Reitz <mreitz@redhat.com>
Message-Id: <20210326145509.163455-3-mreitz@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
378 lines
11 KiB
Bash
Executable File
378 lines
11 KiB
Bash
Executable File
#!/usr/bin/env bash
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# group: rw auto quick
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#
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# Test qcow2 with external data files
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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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# creator
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owner=kwolf@redhat.com
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seq=$(basename $0)
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echo "QA output created by $seq"
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status=1 # failure is the default!
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_cleanup()
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{
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_cleanup_test_img
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_rm_test_img "$TEST_IMG.data"
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_rm_test_img "$TEST_IMG.src"
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}
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trap "_cleanup; exit \$status" 0 1 2 3 15
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# get standard environment, filters and checks
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. ./common.rc
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. ./common.filter
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. ./common.qemu
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_supported_fmt qcow2
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_supported_proto file
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_supported_os Linux
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# External data files do not work with compat=0.10, and because we use
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# our own external data file, we cannot let the user specify one
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_unsupported_imgopts 'compat=0.10' data_file
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echo
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echo "=== Create and open image with external data file ==="
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echo
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echo "With data file name in the image:"
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_make_test_img -o "data_file=$TEST_IMG.data" 64M
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_check_test_img
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$QEMU_IO -c "open $TEST_IMG" -c "read -P 0 0 64k" 2>&1 | _filter_qemu_io | _filter_testdir
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$QEMU_IO -c "open -odata-file.filename=$TEST_IMG.data $TEST_IMG" -c "read -P 0 0 64k" 2>&1 | _filter_qemu_io | _filter_testdir
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$QEMU_IO -c "open -odata-file.filename=inexistent $TEST_IMG" -c "read -P 0 0 64k" 2>&1 | _filter_qemu_io | _filter_testdir
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echo
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echo "Data file required, but without data file name in the image:"
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$QEMU_IMG amend -odata_file= $TEST_IMG
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$QEMU_IO -c "open $TEST_IMG" -c "read -P 0 0 64k" 2>&1 | _filter_qemu_io | _filter_testdir
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$QEMU_IO -c "open -odata-file.filename=$TEST_IMG.data $TEST_IMG" -c "read -P 0 0 64k" 2>&1 | _filter_qemu_io | _filter_testdir
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$QEMU_IO -c "open -odata-file.filename=inexistent $TEST_IMG" -c "read -P 0 0 64k" 2>&1 | _filter_qemu_io | _filter_testdir
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echo
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echo "Setting data-file for an image with internal data:"
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_make_test_img 64M
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$QEMU_IO -c "open -odata-file.filename=$TEST_IMG.data $TEST_IMG" -c "read -P 0 0 64k" 2>&1 | _filter_qemu_io | _filter_testdir
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$QEMU_IO -c "open -odata-file.filename=inexistent $TEST_IMG" -c "read -P 0 0 64k" 2>&1 | _filter_qemu_io | _filter_testdir
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echo
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echo "=== Conflicting features ==="
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echo
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echo "Convert to compressed target with data file:"
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TEST_IMG="$TEST_IMG.src" _make_test_img 64M
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$QEMU_IO -c 'write -P 0x11 0 1M' \
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-f $IMGFMT "$TEST_IMG.src" |
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_filter_qemu_io
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$QEMU_IMG convert -f $IMGFMT -O $IMGFMT -c -odata_file="$TEST_IMG.data" \
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"$TEST_IMG.src" "$TEST_IMG"
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echo
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echo "Convert uncompressed, then write compressed data manually:"
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$QEMU_IMG convert -f $IMGFMT -O $IMGFMT -odata_file="$TEST_IMG.data" \
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"$TEST_IMG.src" "$TEST_IMG"
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$QEMU_IMG compare "$TEST_IMG.src" "$TEST_IMG"
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$QEMU_IO -c 'write -c -P 0x22 0 1M' \
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-f $IMGFMT "$TEST_IMG" |
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_filter_qemu_io
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_check_test_img
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echo
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echo "Take an internal snapshot:"
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$QEMU_IMG snapshot -c test "$TEST_IMG"
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_check_test_img
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echo
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echo "=== Standalone image with external data file (efficient) ==="
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echo
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_make_test_img -o "data_file=$TEST_IMG.data" 64M
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echo -n "qcow2 file size before I/O: "
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du -b $TEST_IMG | cut -f1
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# Create image with the following layout
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# 0-1 MB: Unallocated
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# 1-2 MB: Written (pattern 0x11)
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# 2-3 MB: Discarded
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# 3-4 MB: Zero write over discarded space
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# 4-5 MB: Zero write over written space
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# 5-6 MB: Zero write over unallocated space
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echo
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$QEMU_IO -c 'write -P 0x11 1M 4M' \
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-c 'discard 2M 2M' \
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-c 'write -z 3M 3M' \
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-f $IMGFMT "$TEST_IMG" |
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_filter_qemu_io
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_check_test_img
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echo
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$QEMU_IMG map --output=json "$TEST_IMG"
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echo
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$QEMU_IO -c 'read -P 0 0 1M' \
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-c 'read -P 0x11 1M 1M' \
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-c 'read -P 0 2M 4M' \
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-f $IMGFMT "$TEST_IMG" |
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_filter_qemu_io
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# Zero clusters are only marked as such in the qcow2 metadata, but contain
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# stale data in the external data file
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echo
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$QEMU_IO -c 'read -P 0 0 1M' \
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-c 'read -P 0x11 1M 1M' \
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-c 'read -P 0x11 4M 1M' \
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-c 'read -P 0 5M 1M' \
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-f raw "$TEST_IMG.data" |
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_filter_qemu_io
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echo -n "qcow2 file size after I/O: "
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du -b $TEST_IMG | cut -f1
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echo
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echo "=== Standalone image with external data file (valid raw) ==="
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echo
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_make_test_img -o "data_file=$TEST_IMG.data,data_file_raw=on" 64M
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echo -n "qcow2 file size before I/O: "
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du -b $TEST_IMG | cut -f1
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echo
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$QEMU_IO -c 'write -P 0x11 1M 4M' \
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-c 'discard 2M 2M' \
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-c 'write -z 3M 3M' \
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-f $IMGFMT "$TEST_IMG" |
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_filter_qemu_io
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_check_test_img
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echo
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$QEMU_IMG map --output=json "$TEST_IMG"
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echo
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$QEMU_IO -c 'read -P 0 0 1M' \
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-c 'read -P 0x11 1M 1M' \
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-c 'read -P 0 2M 4M' \
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-f $IMGFMT "$TEST_IMG" |
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_filter_qemu_io
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# Discarded clusters are only marked as such in the qcow2 metadata, but
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# they can contain stale data in the external data file. Instead, zero
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# clusters must be zeroed in the external data file too.
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echo
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$QEMU_IO -c 'read -P 0 0 1M' \
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-c 'read -P 0x11 1M 1M' \
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-c 'read -P 0 3M 3M' \
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-f raw "$TEST_IMG".data |
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_filter_qemu_io
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echo -n "qcow2 file size after I/O: "
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du -b $TEST_IMG | cut -f1
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echo
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echo "=== bdrv_co_block_status test for file and offset=0 ==="
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echo
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_make_test_img -o "data_file=$TEST_IMG.data" 64M
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$QEMU_IO -c 'write -P 0x11 0 1M' -f $IMGFMT "$TEST_IMG" | _filter_qemu_io
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$QEMU_IO -c 'read -P 0x11 0 1M' -f $IMGFMT "$TEST_IMG" | _filter_qemu_io
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$QEMU_IMG map --output=human "$TEST_IMG" | _filter_testdir
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$QEMU_IMG map --output=json "$TEST_IMG"
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echo
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echo "=== Copy offloading ==="
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echo
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# Make use of copy offloading if the test host can provide it
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_make_test_img -o "data_file=$TEST_IMG.data" 64M
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$QEMU_IMG convert -f $IMGFMT -O $IMGFMT -n -C "$TEST_IMG.src" "$TEST_IMG"
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$QEMU_IMG compare -f $IMGFMT -F $IMGFMT "$TEST_IMG.src" "$TEST_IMG"
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# blkdebug doesn't support copy offloading, so this tests the error path
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$QEMU_IMG amend -f $IMGFMT -o "data_file=blkdebug::$TEST_IMG.data" "$TEST_IMG"
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$QEMU_IMG convert -f $IMGFMT -O $IMGFMT -n -C "$TEST_IMG.src" "$TEST_IMG"
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$QEMU_IMG compare -f $IMGFMT -F $IMGFMT "$TEST_IMG.src" "$TEST_IMG"
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echo
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echo "=== Flushing should flush the data file ==="
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echo
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# We are going to flush a qcow2 file with a blkdebug node inserted
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# between the qcow2 node and its data file node. The blkdebug node
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# will return an error for all flushes and so we if the data file is
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# flushed, we will see qemu-io return an error.
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# We need to write something or the flush will not do anything; we
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# also need -t writeback so the write is not done as a FUA write
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# (which would then fail thanks to the implicit flush)
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$QEMU_IO -c 'write 0 512' -c flush \
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-t writeback \
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"json:{
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'driver': 'qcow2',
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'file': {
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'driver': 'file',
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'filename': '$TEST_IMG'
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},
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'data-file': {
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'driver': 'blkdebug',
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'inject-error': [{
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'event': 'none',
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'iotype': 'flush'
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}],
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'image': {
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'driver': 'file',
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'filename': '$TEST_IMG.data'
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}
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}
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}" \
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| _filter_qemu_io
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result=${PIPESTATUS[0]}
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echo
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case $result in
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0)
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echo "ERROR: qemu-io succeeded, so the data file was not flushed"
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;;
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1)
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echo "Success: qemu-io failed, so the data file was flushed"
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;;
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*)
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echo "ERROR: qemu-io returned unknown exit code $result"
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;;
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esac
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echo
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echo '=== Preallocation with data-file-raw ==='
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echo
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echo '--- Using a non-zeroed data file ---'
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# Using data-file-raw must enforce at least metadata preallocation so
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# that it does not matter whether one reads the raw file or the qcow2
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# file
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# Pre-create the data file, write some data. Real-world use cases for
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# this are adding a qcow2 metadata file to a block device (i.e., using
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# the device as the data file) or adding qcow2 features to pre-existing
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# raw images (e.g. because the user now wants persistent dirty bitmaps).
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truncate -s 1M "$TEST_IMG.data"
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$QEMU_IO -f raw -c 'write -P 42 0 1M' "$TEST_IMG.data" | _filter_qemu_io
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# We cannot use qemu-img to create the qcow2 image, because it would
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# clear the data file. Use the blockdev-create job instead, which will
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# only format the qcow2 image file.
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touch "$TEST_IMG"
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_launch_qemu \
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-blockdev file,node-name=data,filename="$TEST_IMG.data" \
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-blockdev file,node-name=meta,filename="$TEST_IMG"
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_send_qemu_cmd $QEMU_HANDLE '{ "execute": "qmp_capabilities" }' 'return'
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_send_qemu_cmd $QEMU_HANDLE \
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'{ "execute": "blockdev-create",
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"arguments": {
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"job-id": "create",
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"options": {
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"driver": "qcow2",
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"size": '"$((1 * 1024 * 1024))"',
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"file": "meta",
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"data-file": "data",
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"data-file-raw": true
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} } }' \
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'"status": "concluded"'
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_send_qemu_cmd $QEMU_HANDLE \
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'{ "execute": "job-dismiss", "arguments": { "id": "create" } }' \
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'return'
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_cleanup_qemu
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echo
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echo 'Comparing pattern:'
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# Reading from either the qcow2 file or the data file should return
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# the same result:
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$QEMU_IO -f raw -c 'read -P 42 0 1M' "$TEST_IMG.data" | _filter_qemu_io
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$QEMU_IO -f $IMGFMT -c 'read -P 42 0 1M' "$TEST_IMG" | _filter_qemu_io
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# For good measure
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$QEMU_IMG compare -f raw "$TEST_IMG.data" "$TEST_IMG"
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echo
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echo '--- Truncation (growing) ---'
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# Append some new data to the raw file, then resize the qcow2 image
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# accordingly and see whether the new data is visible. Technically
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# that is not allowed, but it is reasonable behavior, so test it.
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truncate -s 2M "$TEST_IMG.data"
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$QEMU_IO -f raw -c 'write -P 84 1M 1M' "$TEST_IMG.data" | _filter_qemu_io
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$QEMU_IMG resize "$TEST_IMG" 2M
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echo
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echo 'Comparing pattern:'
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$QEMU_IO -f raw -c 'read -P 42 0 1M' -c 'read -P 84 1M 1M' "$TEST_IMG.data" \
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| _filter_qemu_io
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$QEMU_IO -f $IMGFMT -c 'read -P 42 0 1M' -c 'read -P 84 1M 1M' "$TEST_IMG" \
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| _filter_qemu_io
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$QEMU_IMG compare -f raw "$TEST_IMG.data" "$TEST_IMG"
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echo
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echo '--- Giving a backing file at runtime ---'
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# qcow2 files with data-file-raw cannot have backing files given by
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# their image header, but qemu will allow you to set a backing node at
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# runtime -- it should not have any effect, though (because reading
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# from the qcow2 node should return the same data as reading from the
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# raw node).
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_make_test_img -o "data_file=$TEST_IMG.data,data_file_raw=on" 1M
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TEST_IMG="$TEST_IMG.base" _make_test_img 1M
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# Write something that is not zero into the base image
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$QEMU_IO -c 'write -P 42 0 1M' "$TEST_IMG.base" | _filter_qemu_io
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echo
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echo 'Comparing qcow2 image and raw data file:'
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# $TEST_IMG and $TEST_IMG.data must show the same data at all times;
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# that is, the qcow2 node must not fall through to the backing image
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# at any point
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$QEMU_IMG compare --image-opts \
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"driver=raw,file.filename=$TEST_IMG.data" \
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"file.filename=$TEST_IMG,backing.file.filename=$TEST_IMG.base"
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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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