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