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Diffstat (limited to 'tests/qemu-iotests/179')
| -rwxr-xr-x | tests/qemu-iotests/179 | 130 |
1 files changed, 130 insertions, 0 deletions
diff --git a/tests/qemu-iotests/179 b/tests/qemu-iotests/179 new file mode 100755 index 0000000000..7bc8db8fe0 --- /dev/null +++ b/tests/qemu-iotests/179 @@ -0,0 +1,130 @@ +#!/bin/bash +# +# Test case for write zeroes with unmap +# +# 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=eblake@redhat.com + +seq="$(basename $0)" +echo "QA output created by $seq" + +here="$PWD" +status=1 # failure is the default! + +_cleanup() +{ + _cleanup_test_img +} +trap "_cleanup; exit \$status" 0 1 2 3 15 + +# get standard environment, filters and checks +. ./common.rc +. ./common.filter + +_supported_fmt qcow2 +_supported_proto file +_supported_os Linux + +# v2 images can't mark clusters as zero +_unsupported_imgopts compat=0.10 + +echo +echo '=== Testing write zeroes with unmap ===' +echo + +TEST_IMG="$TEST_IMG.base" _make_test_img 64M +_make_test_img -b "$TEST_IMG.base" + +# Offsets chosen at or near 2M boundaries so test works at all cluster sizes +# 8k and larger (smaller clusters fail due to non-contiguous allocations) + +# Aligned writes to unallocated cluster should not allocate mapping, but must +# mark cluster as zero, whether or not unmap was requested +$QEMU_IO -c "write -z -u 2M 2M" "$TEST_IMG.base" | _filter_qemu_io +$QEMU_IO -c "write -z 6M 2M" "$TEST_IMG.base" | _filter_qemu_io +$QEMU_IO -c "map" "$TEST_IMG.base" | _filter_qemu_io +$QEMU_IMG map --output=json "$TEST_IMG.base" | _filter_qemu_img_map + +# Unaligned writes need not allocate mapping if the cluster already reads +# as zero, but must mark cluster as zero, whether or not unmap was requested +$QEMU_IO -c "write -z -u 10485761 2097150" "$TEST_IMG.base" | _filter_qemu_io +$QEMU_IO -c "write -z 14680065 2097150" "$TEST_IMG.base" | _filter_qemu_io +$QEMU_IO -c "map" "$TEST_IMG.base" | _filter_qemu_io +$QEMU_IMG map --output=json "$TEST_IMG.base" | _filter_qemu_img_map + +# Requesting unmap of normal data must deallocate; omitting unmap should +# preserve the mapping +$QEMU_IO -c "write 18M 14M" "$TEST_IMG.base" | _filter_qemu_io +$QEMU_IO -c "write -z -u 20M 2M" "$TEST_IMG.base" | _filter_qemu_io +$QEMU_IO -c "write -z 24M 6M" "$TEST_IMG.base" | _filter_qemu_io +$QEMU_IO -c "map" "$TEST_IMG.base" | _filter_qemu_io +$QEMU_IMG map --output=json "$TEST_IMG.base" | _filter_qemu_img_map + +# Likewise when writing on already-mapped zero data +$QEMU_IO -c "write -z -u 26M 2M" "$TEST_IMG.base" | _filter_qemu_io +$QEMU_IO -c "write -z 28M 2M" "$TEST_IMG.base" | _filter_qemu_io +$QEMU_IO -c "map" "$TEST_IMG.base" | _filter_qemu_io +$QEMU_IMG map --output=json "$TEST_IMG.base" | _filter_qemu_img_map + +# Writing on unmapped zeroes does not allocate +$QEMU_IO -c "write -z 32M 8M" "$TEST_IMG.base" | _filter_qemu_io +$QEMU_IO -c "write -z -u 34M 2M" "$TEST_IMG.base" | _filter_qemu_io +$QEMU_IO -c "write -z 36M 2M" "$TEST_IMG.base" | _filter_qemu_io +$QEMU_IO -c "map" "$TEST_IMG.base" | _filter_qemu_io +$QEMU_IMG map --output=json "$TEST_IMG.base" | _filter_qemu_img_map + +# Writing zero overrides a backing file, regardless of backing cluster type +$QEMU_IO -c "write -z 40M 8M" "$TEST_IMG.base" | _filter_qemu_io +$QEMU_IO -c "write 48M 8M" "$TEST_IMG.base" | _filter_qemu_io +$QEMU_IO -c "write -z -u 42M 2M" "$TEST_IMG" | _filter_qemu_io +$QEMU_IO -c "write -z 44M 2M" "$TEST_IMG" | _filter_qemu_io +$QEMU_IO -c "write -z -u 50M 2M" "$TEST_IMG" | _filter_qemu_io +$QEMU_IO -c "write -z 52M 2M" "$TEST_IMG" | _filter_qemu_io +$QEMU_IO -c "write -z -u 58M 2M" "$TEST_IMG" | _filter_qemu_io +$QEMU_IO -c "write -z 60M 2M" "$TEST_IMG" | _filter_qemu_io +$QEMU_IO -c "map" "$TEST_IMG" | _filter_qemu_io +$QEMU_IMG map --output=json "$TEST_IMG" | _filter_qemu_img_map + +# Final check that mappings are correct and images are still sane +TEST_IMG="$TEST_IMG.base" _check_test_img +_check_test_img + +echo +echo '=== Testing cache optimization ===' +echo + +BLKDBG_TEST_IMG="blkdebug:$TEST_DIR/blkdebug.conf:$TEST_IMG.base" + +cat > "$TEST_DIR/blkdebug.conf" <<EOF +[inject-error] +event = "l2_update" +errno = "5" +immediately = "on" +once = "off" +EOF + +# None of the following writes should trigger an L2 update, because the +# cluster already reads as zero, and we don't have to change allocation +$QEMU_IO -c "w -z -u 20M 2M" "$BLKDBG_TEST_IMG" | _filter_qemu_io +$QEMU_IO -c "w -z 20M 2M" "$BLKDBG_TEST_IMG" | _filter_qemu_io +$QEMU_IO -c "w -z 28M 2M" "$BLKDBG_TEST_IMG" | _filter_qemu_io + +# success, all done +echo '*** done' +status=0 |