e6e8db0337
If we use growth_mode = metadata, it is very much possible that the file uses more disk space after we have written something to the added area. We did indeed want to test for this case, but unfortunately we evidently just copied the code from the "Test creation preallocation" section and forgot to replace "$create_mode" by "$growth_mode". We never noticed because we only read the first number from qemu-img info's "disk size" output -- and that is effectively useless, because qemu-img prints a human-readable value (which generally includes a decimal point). That will be fixed in the patch after the next one. Signed-off-by: Max Reitz <mreitz@redhat.com> Message-id: 20190925183231.11196-2-mreitz@redhat.com Reviewed-by: Eric Blake <eblake@redhat.com> Signed-off-by: Max Reitz <mreitz@redhat.com>
132 lines
4.6 KiB
Bash
Executable file
132 lines
4.6 KiB
Bash
Executable file
#!/usr/bin/env bash
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#
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# Test preallocated growth of qcow2 images
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#
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# Copyright (C) 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 $seq"
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status=1 # failure is the default!
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_cleanup()
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{
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_cleanup_test_img
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}
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trap "_cleanup; exit \$status" 0 1 2 3 15
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get_image_size_on_host()
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{
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$QEMU_IMG info -f "$IMGFMT" "$TEST_IMG" | grep "disk size" \
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| sed -e 's/^[^0-9]*\([0-9]\+\).*$/\1/'
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}
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# get standard environment and filters
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. ./common.rc
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. ./common.filter
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_supported_fmt qcow2
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_supported_proto file
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if [ -z "$TEST_IMG_FILE" ]; then
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TEST_IMG_FILE=$TEST_IMG
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fi
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# Generally, we create some image with or without existing preallocation and
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# then resize it. Then we write some data into the image and verify that its
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# size does not change if we have used preallocation.
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# With a cluster size of 512 B, one L2 table covers 64 * 512 B = 32 kB.
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# One cluster of the L1 table covers 64 * 32 kB = 2 MB.
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# There are multiple cases we want to test:
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# (1) Grow an image without having to allocate a new L2 table.
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# (2) Grow an image, having to allocate a new L2 table.
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# (3) Grow an image, having to grow the L1 table.
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# Therefore, we create an image that is 48 kB below 2 MB. Then:
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# (1) We resize it to 2 MB - 32 kB. (+ 16 kB)
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# (2) We resize it to 2 MB. (+ 48 kB)
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# (3) We resize it to 2 MB + 32 kB. (+ 80 kB)
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# in B
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CREATION_SIZE=$((2 * 1024 * 1024 - 48 * 1024))
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# 512 is the actual test -- but it's good to test 64k as well, just to be sure.
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for cluster_size in 512 64k; do
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# in kB
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for GROWTH_SIZE in 16 48 80; do
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for create_mode in off metadata falloc full; do
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for growth_mode in off metadata falloc full; do
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echo "--- cluster_size=$cluster_size growth_size=$GROWTH_SIZE create_mode=$create_mode growth_mode=$growth_mode ---"
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IMGOPTS="preallocation=$create_mode,cluster_size=$cluster_size" _make_test_img ${CREATION_SIZE}
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$QEMU_IMG resize -f "$IMGFMT" --preallocation=$growth_mode "$TEST_IMG" +${GROWTH_SIZE}K
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host_size_0=$(get_image_size_on_host)
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file_length_0=$(stat -c '%s' "$TEST_IMG_FILE")
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$QEMU_IO -c "write 0 $CREATION_SIZE" "$TEST_IMG" | _filter_qemu_io
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host_size_1=$(get_image_size_on_host)
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file_length_1=$(stat -c '%s' "$TEST_IMG_FILE")
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$QEMU_IO -c "write $CREATION_SIZE ${GROWTH_SIZE}K" "$TEST_IMG" | _filter_qemu_io
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host_size_2=$(get_image_size_on_host)
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file_length_2=$(stat -c '%s' "$TEST_IMG_FILE")
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# Test creation preallocation: Compare #0 against #1
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if [ $create_mode != off ]; then
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# The image length should not have grown
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if [ $file_length_1 -gt $file_length_0 ]; then
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echo "ERROR (create): Image length has grown from $file_length_0 to $file_length_1"
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fi
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if [ $create_mode != metadata ]; then
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# The host size should not have grown either
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if [ $host_size_1 -gt $host_size_0 ]; then
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echo "ERROR (create): Host size has grown from $host_size_0 to $host_size_1"
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fi
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fi
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fi
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# Test resize preallocation: Compare #2 against #1
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if [ $growth_mode != off ]; then
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# The image length should not have grown
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if [ $file_length_2 -gt $file_length_1 ]; then
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echo "ERROR (grow): Image length has grown from $file_length_1 to $file_length_2"
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fi
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if [ $growth_mode != metadata ]; then
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# The host size should not have grown either
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if [ $host_size_2 -gt $host_size_1 ]; then
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echo "ERROR (grow): Host size has grown from $host_size_1 to $host_size_2"
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fi
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fi
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fi
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echo
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done
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done
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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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