1#!/usr/bin/env bash 2# group: rw quick 3# 4# Test case for copy-on-read into qcow2, using the COR filter driver 5# 6# Copyright (C) 2018 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 22seq="$(basename $0)" 23echo "QA output created by $seq" 24 25status=1 # failure is the default! 26 27# get standard environment, filters and checks 28. ./common.rc 29. ./common.filter 30 31TEST_WRAP="$TEST_DIR/t.wrap.qcow2" 32BLKDBG_CONF="$TEST_DIR/blkdebug.conf" 33 34# Sanity check: our use of blkdebug fails if $TEST_DIR contains spaces 35# or other problems 36case "$TEST_DIR" in 37 *[^-_a-zA-Z0-9/]*) 38 _notrun "Suspicious TEST_DIR='$TEST_DIR', cowardly refusing to run" ;; 39esac 40 41_cleanup() 42{ 43 _cleanup_test_img 44 _rm_test_img "$TEST_WRAP" 45 rm -f "$BLKDBG_CONF" 46} 47trap "_cleanup; exit \$status" 0 1 2 3 15 48 49# Test is supported for any backing file; but we force qcow2 for our wrapper. 50_supported_fmt generic 51_supported_proto generic 52# LUKS support may be possible, but it complicates things. 53_unsupported_fmt luks 54_unsupported_imgopts "subformat=streamOptimized" 55 56echo 57echo '=== Copy-on-read ===' 58echo 59 60# Prep the images 61# VPC rounds image sizes to a specific geometry, force a specific size. 62if [ "$IMGFMT" = "vpc" ]; then 63 IMGOPTS=$(_optstr_add "$IMGOPTS" "force_size") 64fi 65_make_test_img 4G 66$QEMU_IO -c "write -P 55 3G 1k" "$TEST_IMG" | _filter_qemu_io 67IMGPROTO=file IMGFMT=qcow2 TEST_IMG_FILE="$TEST_WRAP" \ 68 _make_test_img --no-opts -F "$IMGFMT" -b "$TEST_IMG" | _filter_img_create 69$QEMU_IO -f qcow2 -c "write -z -u 1M 64k" "$TEST_WRAP" | _filter_qemu_io 70 71# Ensure that a read of two clusters, but where one is already allocated, 72# does not re-write the allocated cluster 73cat > "$BLKDBG_CONF" <<EOF 74[inject-error] 75event = "cor_write" 76sector = "2048" 77EOF 78$QEMU_IO -c "open \ 79 -o driver=copy-on-read,file.driver=blkdebug,file.config=$BLKDBG_CONF,file.image.driver=qcow2 $TEST_WRAP" \ 80 -c "read -P 0 1M 128k" | _filter_qemu_io 81 82# Read the areas we want copied. A zero-length read should still be a 83# no-op. The next read is under 2G, but aligned so that rounding to 84# clusters copies more than 2G of zeroes. The final read will pick up 85# the non-zero data in the same cluster. Since a 2G read may exhaust 86# memory on some machines (particularly 32-bit), we skip the test if 87# that fails due to memory pressure. 88$QEMU_IO \ 89 -c "open -o driver=copy-on-read,file.driver=qcow2 $TEST_WRAP" \ 90 -c "read 0 0" \ 91 | _filter_qemu_io 92output=$($QEMU_IO \ 93 -c "open -o driver=copy-on-read,file.driver=qcow2 $TEST_WRAP" \ 94 -c "read -P 0 1k $((2*1024*1024*1024 - 512))" \ 95 2>&1 | _filter_qemu_io) 96case $output in 97 *allocate*) 98 _notrun "Insufficent memory to run test" ;; 99 *) printf '%s\n' "$output" ;; 100esac 101$QEMU_IO \ 102 -c "open -o driver=copy-on-read,file.driver=qcow2 $TEST_WRAP" \ 103 -c "read -P 0 $((3*1024*1024*1024 + 1024)) 1k" \ 104 | _filter_qemu_io 105 106# Copy-on-read is incompatible with read-only 107$QEMU_IO \ 108 -c "open -r -o driver=copy-on-read,file.driver=qcow2 $TEST_WRAP" \ 109 2>&1 | _filter_testdir 110 111# Break the backing chain, and show that images are identical, and that 112# we properly copied over explicit zeros. 113$QEMU_IMG rebase -u -b "" -f qcow2 "$TEST_WRAP" 114$QEMU_IO -f qcow2 -c map "$TEST_WRAP" 115_check_test_img 116$QEMU_IMG compare -f $IMGFMT -F qcow2 "$TEST_IMG" "$TEST_WRAP" 117 118# success, all done 119echo '*** done' 120status=0 121