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Diffstat (limited to 'tests/qemu-iotests/125')
| -rwxr-xr-x | tests/qemu-iotests/125 | 203 |
1 files changed, 203 insertions, 0 deletions
diff --git a/tests/qemu-iotests/125 b/tests/qemu-iotests/125 new file mode 100755 index 000000000..bd390b3a9 --- /dev/null +++ b/tests/qemu-iotests/125 @@ -0,0 +1,203 @@ +#!/usr/bin/env bash +# group: rw +# +# Test preallocated growth of qcow2 images +# +# Copyright (C) 2017 Red Hat, Inc. +# +# This program is free software; you can redistribute it and/or modify +# it under the terms of the GNU General Public License as published by +# the Free Software Foundation; either version 2 of the License, or +# (at your option) any later version. +# +# This program is distributed in the hope that it will be useful, +# but WITHOUT ANY WARRANTY; without even the implied warranty of +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +# GNU General Public License for more details. +# +# You should have received a copy of the GNU General Public License +# along with this program. If not, see <http://www.gnu.org/licenses/>. +# + +# creator +owner=mreitz@redhat.com + +seq=$(basename $0) +echo "QA output created by $seq" + +status=1 # failure is the default! + +_cleanup() +{ + _cleanup_test_img +} +trap "_cleanup; exit \$status" 0 1 2 3 15 + +get_image_size_on_host() +{ + echo $(($(stat -c '%b * %B' "$TEST_IMG_FILE"))) +} + +# get standard environment and filters +. ./common.rc +. ./common.filter + +_supported_fmt qcow2 +_supported_proto file +# Growing a file with a backing file (without preallocation=full or +# =falloc) requires zeroing the newly added area, which is impossible +# to do quickly for v2 images, and hence is unsupported. +_unsupported_imgopts 'compat=0.10' + +if [ -z "$TEST_IMG_FILE" ]; then + TEST_IMG_FILE=$TEST_IMG +fi + +# Test whether we are running on a broken XFS version. There is this +# bug: + +# $ rm -f foo +# $ touch foo +# $ block_size=4096 # Your FS's block size +# $ fallocate -o $((block_size / 2)) -l $block_size foo +# $ LANG=C xfs_bmap foo | grep hole +# 1: [8..15]: hole +# +# The problem is that the XFS driver rounds down the offset and +# rounds up the length to the block size, but independently. As +# such, it only allocates the first block in the example above, +# even though it should allocate the first two blocks (because our +# request is to fallocate something that touches both the first +# two blocks). +# +# This means that when you then write to the beginning of the +# second block, the disk usage of the first two blocks grows. +# +# That is precisely what fallocate() promises, though: That when you +# write to an area that you have fallocated, no new blocks will have +# to be allocated. + +touch "$TEST_IMG_FILE" +# Assuming there is no FS with a block size greater than 64k +fallocate -o 65535 -l 2 "$TEST_IMG_FILE" +len0=$(get_image_size_on_host) + +# Write to something that in theory we have just fallocated +# (Thus, the on-disk size should not increase) +poke_file "$TEST_IMG_FILE" 65536 42 +len1=$(get_image_size_on_host) + +if [ $len1 -gt $len0 ]; then + _notrun "the test filesystem's fallocate() is broken" +fi + +rm -f "$TEST_IMG_FILE" + +# Generally, we create some image with or without existing preallocation and +# then resize it. Then we write some data into the image and verify that its +# size does not change if we have used preallocation. + +# With a cluster size of 512 B, one L2 table covers 64 * 512 B = 32 kB. +# One cluster of the L1 table covers 64 * 32 kB = 2 MB. +# There are multiple cases we want to test: +# (1) Grow an image without having to allocate a new L2 table. +# (2) Grow an image, having to allocate a new L2 table. +# (3) Grow an image, having to grow the L1 table. +# Therefore, we create an image that is 48 kB below 2 MB. Then: +# (1) We resize it to 2 MB - 32 kB. (+ 16 kB) +# (2) We resize it to 2 MB. (+ 48 kB) +# (3) We resize it to 2 MB + 32 kB. (+ 80 kB) + +# in B +CREATION_SIZE=$((2 * 1024 * 1024 - 48 * 1024)) + +# 512 is the actual test -- but it's good to test 64k as well, just to be sure. +for cluster_size in 512 64k; do +# in kB +for GROWTH_SIZE in 16 48 80; do + for create_mode in off metadata falloc full; do + for growth_mode in off metadata falloc full; do + echo "--- cluster_size=$cluster_size growth_size=$GROWTH_SIZE create_mode=$create_mode growth_mode=$growth_mode ---" + + _make_test_img -o "preallocation=$create_mode,cluster_size=$cluster_size" ${CREATION_SIZE} + $QEMU_IMG resize -f "$IMGFMT" --preallocation=$growth_mode "$TEST_IMG" +${GROWTH_SIZE}K + + host_size_0=$(get_image_size_on_host) + file_length_0=$(stat -c '%s' "$TEST_IMG_FILE") + + $QEMU_IO -c "write 0 $CREATION_SIZE" "$TEST_IMG" | _filter_qemu_io + + host_size_1=$(get_image_size_on_host) + file_length_1=$(stat -c '%s' "$TEST_IMG_FILE") + + $QEMU_IO -c "write $CREATION_SIZE ${GROWTH_SIZE}K" "$TEST_IMG" | _filter_qemu_io + + host_size_2=$(get_image_size_on_host) + file_length_2=$(stat -c '%s' "$TEST_IMG_FILE") + + # Test creation preallocation: Compare #0 against #1 + if [ $create_mode != off ]; then + # The image length should not have grown + if [ $file_length_1 -gt $file_length_0 ]; then + echo "ERROR (create): Image length has grown from $file_length_0 to $file_length_1" + fi + if [ $create_mode != metadata ]; then + # The host size should not have grown either + if [ $host_size_1 -gt $host_size_0 ]; then + echo "ERROR (create): Host size has grown from $host_size_0 to $host_size_1" + fi + fi + fi + + # Test resize preallocation: Compare #2 against #1 + if [ $growth_mode != off ]; then + # The image length should not have grown + if [ $file_length_2 -gt $file_length_1 ]; then + echo "ERROR (grow): Image length has grown from $file_length_1 to $file_length_2" + fi + if [ $growth_mode != metadata ]; then + # The host size should not have grown either + if [ $host_size_2 -gt $host_size_1 ]; then + echo "ERROR (grow): Host size has grown from $host_size_1 to $host_size_2" + fi + fi + fi + + echo + done + done +done +done + +# Test image resizing using preallocation and unaligned offsets +$QEMU_IMG create -f raw "$TEST_IMG.base" 128k | _filter_img_create +$QEMU_IO -c 'write -q -P 1 0 128k' -f raw "$TEST_IMG.base" +for orig_size in 31k 33k; do + for dst_size in 96k 128k; do + for prealloc in metadata full; do + echo "--- Resizing image from $orig_size to $dst_size (preallocation=$prealloc) ---" + _make_test_img -F raw -b "$TEST_IMG.base" -o cluster_size=64k "$orig_size" + $QEMU_IMG resize -f "$IMGFMT" --preallocation="$prealloc" "$TEST_IMG" "$dst_size" + # The first part of the image should contain data from the backing file + $QEMU_IO -c "read -q -P 1 0 ${orig_size}" "$TEST_IMG" + # The resized part of the image should contain zeroes + $QEMU_IO -c "read -q -P 0 ${orig_size} 63k" "$TEST_IMG" + # If the image does not have an external data file we can also verify its + # actual size. The resized image should have 7 clusters: + # header, L1 table, L2 table, refcount table, refcount block, 2 data clusters + if ! _get_data_file "$TEST_IMG" > /dev/null; then + expected_file_length=$((65536 * 7)) + file_length=$(stat -c '%s' "$TEST_IMG_FILE") + if [ "$file_length" != "$expected_file_length" ]; then + echo "ERROR: file length $file_length (expected $expected_file_length)" + fi + fi + echo + done + done +done + +# success, all done +echo '*** done' +rm -f $seq.full +status=0 |