1#!/usr/bin/env bash 2# group: rw auto quick 3# 4# Test case for write zeroes with unmap 5# 6# Copyright (C) 2017 Red Hat, Inc. 7# 8# This program is free software; you can redistribute it and/or modify 9# it under the terms of the GNU General Public License as published by 10# the Free Software Foundation; either version 2 of the License, or 11# (at your option) any later version. 12# 13# This program is distributed in the hope that it will be useful, 14# but WITHOUT ANY WARRANTY; without even the implied warranty of 15# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16# GNU General Public License for more details. 17# 18# You should have received a copy of the GNU General Public License 19# along with this program. If not, see <http://www.gnu.org/licenses/>. 20# 21 22# creator 23owner=eblake@redhat.com 24 25seq="$(basename $0)" 26echo "QA output created by $seq" 27 28status=1 # failure is the default! 29 30_cleanup() 31{ 32 _cleanup_test_img 33 rm -f "$TEST_DIR/blkdebug.conf" 34} 35trap "_cleanup; exit \$status" 0 1 2 3 15 36 37# get standard environment, filters and checks 38. ./common.rc 39. ./common.filter 40 41_supported_fmt qcow2 42_supported_proto file fuse 43_supported_os Linux 44 45# v2 images can't mark clusters as zero 46_unsupported_imgopts compat=0.10 47 48echo 49echo '=== Testing write zeroes with unmap ===' 50echo 51 52TEST_IMG="$TEST_IMG.base" _make_test_img 64M 53_make_test_img -b "$TEST_IMG.base" -F $IMGFMT 54 55# Offsets chosen at or near 2M boundaries so test works at all cluster sizes 56# 8k and larger (smaller clusters fail due to non-contiguous allocations) 57 58# Aligned writes to unallocated cluster should not allocate mapping, but must 59# mark cluster as zero, whether or not unmap was requested 60$QEMU_IO -c "write -z -u 2M 2M" "$TEST_IMG.base" | _filter_qemu_io 61$QEMU_IO -c "write -z 6M 2M" "$TEST_IMG.base" | _filter_qemu_io 62$QEMU_IO -c "map" "$TEST_IMG.base" | _filter_qemu_io 63$QEMU_IMG map --output=json "$TEST_IMG.base" | _filter_qemu_img_map 64 65# Unaligned writes need not allocate mapping if the cluster already reads 66# as zero, but must mark cluster as zero, whether or not unmap was requested 67$QEMU_IO -c "write -z -u 10485761 2097150" "$TEST_IMG.base" | _filter_qemu_io 68$QEMU_IO -c "write -z 14680065 2097150" "$TEST_IMG.base" | _filter_qemu_io 69$QEMU_IO -c "map" "$TEST_IMG.base" | _filter_qemu_io 70$QEMU_IMG map --output=json "$TEST_IMG.base" | _filter_qemu_img_map 71 72# Requesting unmap of normal data must deallocate; omitting unmap should 73# preserve the mapping 74$QEMU_IO -c "write 18M 14M" "$TEST_IMG.base" | _filter_qemu_io 75$QEMU_IO -c "write -z -u 20M 2M" "$TEST_IMG.base" | _filter_qemu_io 76$QEMU_IO -c "write -z 24M 6M" "$TEST_IMG.base" | _filter_qemu_io 77$QEMU_IO -c "map" "$TEST_IMG.base" | _filter_qemu_io 78$QEMU_IMG map --output=json "$TEST_IMG.base" | _filter_qemu_img_map 79 80# Likewise when writing on already-mapped zero data 81$QEMU_IO -c "write -z -u 26M 2M" "$TEST_IMG.base" | _filter_qemu_io 82$QEMU_IO -c "write -z 28M 2M" "$TEST_IMG.base" | _filter_qemu_io 83$QEMU_IO -c "map" "$TEST_IMG.base" | _filter_qemu_io 84$QEMU_IMG map --output=json "$TEST_IMG.base" | _filter_qemu_img_map 85 86# Writing on unmapped zeroes does not allocate 87$QEMU_IO -c "write -z 32M 8M" "$TEST_IMG.base" | _filter_qemu_io 88$QEMU_IO -c "write -z -u 34M 2M" "$TEST_IMG.base" | _filter_qemu_io 89$QEMU_IO -c "write -z 36M 2M" "$TEST_IMG.base" | _filter_qemu_io 90$QEMU_IO -c "map" "$TEST_IMG.base" | _filter_qemu_io 91$QEMU_IMG map --output=json "$TEST_IMG.base" | _filter_qemu_img_map 92 93# Writing zero overrides a backing file, regardless of backing cluster type 94$QEMU_IO -c "write -z 40M 8M" "$TEST_IMG.base" | _filter_qemu_io 95$QEMU_IO -c "write 48M 8M" "$TEST_IMG.base" | _filter_qemu_io 96$QEMU_IO -c "write -z -u 42M 2M" "$TEST_IMG" | _filter_qemu_io 97$QEMU_IO -c "write -z 44M 2M" "$TEST_IMG" | _filter_qemu_io 98$QEMU_IO -c "write -z -u 50M 2M" "$TEST_IMG" | _filter_qemu_io 99$QEMU_IO -c "write -z 52M 2M" "$TEST_IMG" | _filter_qemu_io 100$QEMU_IO -c "write -z -u 58M 2M" "$TEST_IMG" | _filter_qemu_io 101$QEMU_IO -c "write -z 60M 2M" "$TEST_IMG" | _filter_qemu_io 102$QEMU_IO -c "map" "$TEST_IMG" | _filter_qemu_io 103$QEMU_IMG map --output=json "$TEST_IMG" | _filter_qemu_img_map 104 105# Final check that mappings are correct and images are still sane 106TEST_IMG="$TEST_IMG.base" _check_test_img 107_check_test_img 108 109echo 110echo '=== Testing cache optimization ===' 111echo 112 113BLKDBG_TEST_IMG="blkdebug:$TEST_DIR/blkdebug.conf:$TEST_IMG.base" 114 115cat > "$TEST_DIR/blkdebug.conf" <<EOF 116[inject-error] 117event = "l2_update" 118errno = "5" 119immediately = "on" 120once = "off" 121EOF 122 123# None of the following writes should trigger an L2 update, because the 124# cluster already reads as zero, and we don't have to change allocation 125$QEMU_IO -c "w -z -u 20M 2M" "$BLKDBG_TEST_IMG" | _filter_qemu_io 126$QEMU_IO -c "w -z 20M 2M" "$BLKDBG_TEST_IMG" | _filter_qemu_io 127$QEMU_IO -c "w -z 28M 2M" "$BLKDBG_TEST_IMG" | _filter_qemu_io 128 129# success, all done 130echo '*** done' 131status=0 132