1#!/bin/bash 2# 3# Test case for copy-on-read into qcow2, using the COR filter driver 4# 5# Copyright (C) 2018 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 21seq="$(basename $0)" 22echo "QA output created by $seq" 23 24status=1 # failure is the default! 25 26# get standard environment, filters and checks 27. ./common.rc 28. ./common.filter 29 30TEST_WRAP="$TEST_DIR/t.wrap.qcow2" 31BLKDBG_CONF="$TEST_DIR/blkdebug.conf" 32 33# Sanity check: our use of blkdebug fails if $TEST_DIR contains spaces 34# or other problems 35case "$TEST_DIR" in 36 *[^-_a-zA-Z0-9/]*) 37 _notrun "Suspicious TEST_DIR='$TEST_DIR', cowardly refusing to run" ;; 38esac 39 40_cleanup() 41{ 42 _cleanup_test_img 43 rm -f "$TEST_WRAP" 44 rm -f "$BLKDBG_CONF" 45} 46trap "_cleanup; exit \$status" 0 1 2 3 15 47 48# Test is supported for any backing file; but we force qcow2 for our wrapper. 49_supported_fmt generic 50_supported_proto generic 51_supported_os Linux 52# LUKS support may be possible, but it complicates things. 53_unsupported_fmt luks 54 55echo 56echo '=== Copy-on-read ===' 57echo 58 59# Prep the images 60# VPC rounds image sizes to a specific geometry, force a specific size. 61if [ "$IMGFMT" = "vpc" ]; then 62 IMGOPTS=$(_optstr_add "$IMGOPTS" "force_size") 63fi 64_make_test_img 4G 65$QEMU_IO -c "write -P 55 3G 1k" "$TEST_IMG" | _filter_qemu_io 66IMGPROTO=file IMGFMT=qcow2 IMGOPTS= TEST_IMG_FILE="$TEST_WRAP" \ 67 _make_test_img -F "$IMGFMT" -b "$TEST_IMG" | _filter_img_create 68$QEMU_IO -f qcow2 -c "write -z -u 1M 64k" "$TEST_WRAP" | _filter_qemu_io 69 70# Ensure that a read of two clusters, but where one is already allocated, 71# does not re-write the allocated cluster 72cat > "$BLKDBG_CONF" <<EOF 73[inject-error] 74event = "cor_write" 75sector = "2048" 76EOF 77$QEMU_IO -c "open \ 78 -o driver=copy-on-read,file.driver=blkdebug,file.config=$BLKDBG_CONF,file.image.driver=qcow2 $TEST_WRAP" \ 79 -c "read -P 0 1M 128k" | _filter_qemu_io 80 81# Read the areas we want copied. A zero-length read should still be a 82# no-op. The next read is under 2G, but aligned so that rounding to 83# clusters copies more than 2G of zeroes. The final read will pick up 84# the non-zero data in the same cluster. Since a 2G read may exhaust 85# memory on some machines (particularly 32-bit), we skip the test if 86# that fails due to memory pressure. 87$QEMU_IO \ 88 -c "open -o driver=copy-on-read,file.driver=qcow2 $TEST_WRAP" \ 89 -c "read 0 0" \ 90 | _filter_qemu_io 91output=$($QEMU_IO \ 92 -c "open -o driver=copy-on-read,file.driver=qcow2 $TEST_WRAP" \ 93 -c "read -P 0 1k $((2*1024*1024*1024 - 512))" \ 94 2>&1 | _filter_qemu_io) 95case $output in 96 *allocate*) 97 _notrun "Insufficent memory to run test" ;; 98 *) printf '%s\n' "$output" ;; 99esac 100$QEMU_IO \ 101 -c "open -o driver=copy-on-read,file.driver=qcow2 $TEST_WRAP" \ 102 -c "read -P 0 $((3*1024*1024*1024 + 1024)) 1k" \ 103 | _filter_qemu_io 104 105# Copy-on-read is incompatible with read-only 106$QEMU_IO \ 107 -c "open -r -o driver=copy-on-read,file.driver=qcow2 $TEST_WRAP" \ 108 2>&1 | _filter_testdir 109 110# Break the backing chain, and show that images are identical, and that 111# we properly copied over explicit zeros. 112$QEMU_IMG rebase -u -b "" -f qcow2 "$TEST_WRAP" 113$QEMU_IO -f qcow2 -c map "$TEST_WRAP" 114_check_test_img 115$QEMU_IMG compare -f $IMGFMT -F qcow2 "$TEST_IMG" "$TEST_WRAP" 116 117# success, all done 118echo '*** done' 119status=0 120