1#!/bin/bash 2# 3# Test case for copy-on-read into qcow2 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 $seq" 26 27status=1 # failure is the default! 28 29# get standard environment, filters and checks 30. ./common.rc 31. ./common.filter 32 33TEST_WRAP="$TEST_DIR/t.wrap.qcow2" 34BLKDBG_CONF="$TEST_DIR/blkdebug.conf" 35 36# Sanity check: our use of blkdebug fails if $TEST_DIR contains spaces 37# or other problems 38case "$TEST_DIR" in 39 *[^-_a-zA-Z0-9/]*) 40 _notrun "Suspicious TEST_DIR='$TEST_DIR', cowardly refusing to run" ;; 41esac 42 43_cleanup() 44{ 45 _cleanup_test_img 46 rm -f "$TEST_WRAP" 47 rm -f "$BLKDBG_CONF" 48} 49trap "_cleanup; exit \$status" 0 1 2 3 15 50 51# Test is supported for any backing file; but we force qcow2 for our wrapper. 52_supported_fmt generic 53_supported_proto generic 54_supported_os Linux 55# LUKS support may be possible, but it complicates things. 56_unsupported_fmt luks 57 58echo 59echo '=== Copy-on-read ===' 60echo 61 62# Prep the images 63# VPC rounds image sizes to a specific geometry, force a specific size. 64if [ "$IMGFMT" = "vpc" ]; then 65 IMGOPTS=$(_optstr_add "$IMGOPTS" "force_size") 66fi 67_make_test_img 4G 68$QEMU_IO -c "write -P 55 3G 1k" "$TEST_IMG" | _filter_qemu_io 69IMGPROTO=file IMGFMT=qcow2 IMGOPTS= TEST_IMG_FILE="$TEST_WRAP" \ 70 _make_test_img -F "$IMGFMT" -b "$TEST_IMG" | _filter_img_create 71$QEMU_IO -f qcow2 -c "write -z -u 1M 64k" "$TEST_WRAP" | _filter_qemu_io 72 73# Ensure that a read of two clusters, but where one is already allocated, 74# does not re-write the allocated cluster 75cat > "$BLKDBG_CONF" <<EOF 76[inject-error] 77event = "cor_write" 78sector = "2048" 79EOF 80$QEMU_IO -c "open -C \ 81 -o driver=blkdebug,config=$BLKDBG_CONF,image.driver=qcow2 $TEST_WRAP" \ 82 -c "read -P 0 1M 128k" | _filter_qemu_io 83 84# Read the areas we want copied. A zero-length read should still be a 85# no-op. The next read is under 2G, but aligned so that rounding to 86# clusters copies more than 2G of zeroes. The final read will pick up 87# the non-zero data in the same cluster. Since a 2G read may exhaust 88# memory on some machines (particularly 32-bit), we skip the test if 89# that fails due to memory pressure. 90$QEMU_IO -f qcow2 -C -c "read 0 0" "$TEST_WRAP" | _filter_qemu_io 91output=$($QEMU_IO -f qcow2 -C -c "read -P 0 1k $((2*1024*1024*1024 - 512))" \ 92 "$TEST_WRAP" 2>&1 | _filter_qemu_io) 93case $output in 94 *allocate*) 95 _notrun "Insufficent memory to run test" ;; 96 *) printf '%s\n' "$output" ;; 97esac 98$QEMU_IO -f qcow2 -C -c "read -P 0 $((3*1024*1024*1024 + 1024)) 1k" \ 99 "$TEST_WRAP" | _filter_qemu_io 100 101# Copy-on-read is incompatible with read-only 102$QEMU_IO -f qcow2 -C -r "$TEST_WRAP" 2>&1 | _filter_testdir 103 104# Break the backing chain, and show that images are identical, and that 105# we properly copied over explicit zeros. 106$QEMU_IMG rebase -u -b "" -f qcow2 "$TEST_WRAP" 107$QEMU_IO -f qcow2 -c map "$TEST_WRAP" 108_check_test_img 109$QEMU_IMG compare -f $IMGFMT -F qcow2 "$TEST_IMG" "$TEST_WRAP" 110 111echo 112echo '=== Partial final cluster ===' 113echo 114 115_make_test_img 1024 116$QEMU_IO -f $IMGFMT -C -c 'read 0 1024' "$TEST_IMG" | _filter_qemu_io 117$QEMU_IO -f $IMGFMT -c map "$TEST_IMG" 118_check_test_img 119 120# success, all done 121echo '*** done' 122status=0 123