1#!/usr/bin/env bash 2# group: rw quick 3# 4# Test case for copy-on-read into qcow2 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 $seq" 27 28status=1 # failure is the default! 29 30# get standard environment, filters and checks 31. ./common.rc 32. ./common.filter 33 34TEST_WRAP="$TEST_DIR/t.wrap.qcow2" 35BLKDBG_CONF="$TEST_DIR/blkdebug.conf" 36 37# Sanity check: our use of blkdebug fails if $TEST_DIR contains spaces 38# or other problems 39case "$TEST_DIR" in 40 *[^-_a-zA-Z0-9/]*) 41 _notrun "Suspicious TEST_DIR='$TEST_DIR', cowardly refusing to run" ;; 42esac 43 44_cleanup() 45{ 46 _cleanup_test_img 47 _rm_test_img "$TEST_WRAP" 48 rm -f "$BLKDBG_CONF" 49} 50trap "_cleanup; exit \$status" 0 1 2 3 15 51 52# Test is supported for any backing file; but we force qcow2 for our wrapper. 53_supported_fmt generic 54_supported_proto generic 55# LUKS support may be possible, but it complicates things. 56_unsupported_fmt luks 57_unsupported_imgopts "subformat=streamOptimized" 58 59echo 60echo '=== Copy-on-read ===' 61echo 62 63# Prep the images 64# VPC rounds image sizes to a specific geometry, force a specific size. 65if [ "$IMGFMT" = "vpc" ]; then 66 IMGOPTS=$(_optstr_add "$IMGOPTS" "force_size") 67fi 68_make_test_img 4G 69$QEMU_IO -c "write -P 55 3G 1k" "$TEST_IMG" | _filter_qemu_io 70IMGPROTO=file IMGFMT=qcow2 TEST_IMG_FILE="$TEST_WRAP" \ 71 _make_test_img --no-opts -F "$IMGFMT" -b "$TEST_IMG" | _filter_img_create 72$QEMU_IO -f qcow2 -c "write -z -u 1M 64k" "$TEST_WRAP" | _filter_qemu_io 73 74# Ensure that a read of two clusters, but where one is already allocated, 75# does not re-write the allocated cluster 76cat > "$BLKDBG_CONF" <<EOF 77[inject-error] 78event = "cor_write" 79sector = "2048" 80EOF 81$QEMU_IO -c "open -C \ 82 -o driver=blkdebug,config=$BLKDBG_CONF,image.driver=qcow2 $TEST_WRAP" \ 83 -c "read -P 0 1M 128k" | _filter_qemu_io 84 85# Read the areas we want copied. A zero-length read should still be a 86# no-op. The next read is under 2G, but aligned so that rounding to 87# clusters copies more than 2G of zeroes. The final read will pick up 88# the non-zero data in the same cluster. Since a 2G read may exhaust 89# memory on some machines (particularly 32-bit), we skip the test if 90# that fails due to memory pressure. 91$QEMU_IO -f qcow2 -C -c "read 0 0" "$TEST_WRAP" | _filter_qemu_io 92output=$($QEMU_IO -f qcow2 -C -c "read -P 0 1k $((2*1024*1024*1024 - 512))" \ 93 "$TEST_WRAP" 2>&1 | _filter_qemu_io) 94case $output in 95 *allocate*) 96 _notrun "Insufficent memory to run test" ;; 97 *) printf '%s\n' "$output" ;; 98esac 99$QEMU_IO -f qcow2 -C -c "read -P 0 $((3*1024*1024*1024 + 1024)) 1k" \ 100 "$TEST_WRAP" | _filter_qemu_io 101 102# Copy-on-read is incompatible with read-only 103$QEMU_IO -f qcow2 -C -r "$TEST_WRAP" 2>&1 | _filter_testdir 104 105# Break the backing chain, and show that images are identical, and that 106# we properly copied over explicit zeros. 107$QEMU_IMG rebase -u -b "" -f qcow2 "$TEST_WRAP" 108$QEMU_IO -f qcow2 -c map "$TEST_WRAP" 109_check_test_img 110$QEMU_IMG compare -f $IMGFMT -F qcow2 "$TEST_IMG" "$TEST_WRAP" 111 112echo 113echo '=== Partial final cluster ===' 114echo 115 116# Force compat=1.1, because writing zeroes on a v2 image without a 117# backing file would just result in an unallocated cluster 118# (Also, note that this is really a pure qcow2 test.) 119IMGPROTO=file IMGFMT=qcow2 TEST_IMG_FILE="$TEST_WRAP" \ 120 _make_test_img --no-opts -o compat=1.1 1024 121$QEMU_IO -f qcow2 -C -c 'read 0 1024' "$TEST_WRAP" | _filter_qemu_io 122$QEMU_IO -f qcow2 -c map "$TEST_WRAP" 123_check_test_img 124 125echo 126echo '=== Copy-on-read with subclusters ===' 127echo 128 129# Create base and top images 64K (1 cluster) each. Make subclusters enabled 130# for the top image 131_make_test_img 64K 132IMGPROTO=file IMGFMT=qcow2 TEST_IMG_FILE="$TEST_WRAP" \ 133 _make_test_img --no-opts -o extended_l2=true -F "$IMGFMT" -b "$TEST_IMG" \ 134 64K | _filter_img_create 135 136$QEMU_IO -c "write -P 0xaa 0 64k" "$TEST_IMG" | _filter_qemu_io 137 138# Allocate individual subclusters in the top image, and not the whole cluster 139$QEMU_IO -c "write -P 0xbb 28K 2K" -c "write -P 0xcc 34K 2K" "$TEST_WRAP" \ 140 | _filter_qemu_io 141 142# Only 2 subclusters should be allocated in the top image at this point 143$QEMU_IMG map "$TEST_WRAP" | _filter_qemu_img_map 144 145# Actual copy-on-read operation 146$QEMU_IO -C -c "read -P 0xaa 30K 4K" "$TEST_WRAP" | _filter_qemu_io 147 148# And here we should have 4 subclusters allocated right in the middle of the 149# top image. Make sure the whole cluster remains unallocated 150$QEMU_IMG map "$TEST_WRAP" | _filter_qemu_img_map 151 152_check_test_img 153 154# success, all done 155echo '*** done' 156status=0 157