1#!/usr/bin/env bash 2# 3# Test how 'qemu-io -c discard' behaves on v2 and v3 qcow2 images 4# 5# Copyright (C) 2020 Igalia, S.L. 6# Author: Alberto Garcia <berto@igalia.com> 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=berto@igalia.com 24 25seq=`basename $0` 26echo "QA output created by $seq" 27 28status=1 # failure is the default! 29 30_cleanup() 31{ 32 _cleanup_test_img 33} 34trap "_cleanup; exit \$status" 0 1 2 3 15 35 36# get standard environment, filters and checks 37. ./common.rc 38. ./common.filter 39 40_supported_fmt qcow2 41_supported_proto file 42_supported_os Linux 43_unsupported_imgopts 'compat=0.10' refcount_bits data_file 44 45echo 46echo "### Test 'qemu-io -c discard' on a QCOW2 image without a backing file" 47echo 48for qcow2_compat in 0.10 1.1; do 49 echo "# Create an image with compat=$qcow2_compat without a backing file" 50 _make_test_img -o "compat=$qcow2_compat" 128k 51 52 echo "# Fill all clusters with data and then discard them" 53 $QEMU_IO -c 'write -P 0x01 0 128k' "$TEST_IMG" | _filter_qemu_io 54 $QEMU_IO -c 'discard 0 128k' "$TEST_IMG" | _filter_qemu_io 55 56 echo "# Read the data from the discarded clusters" 57 $QEMU_IO -c 'read -P 0x00 0 128k' "$TEST_IMG" | _filter_qemu_io 58 59 echo "# Output of qemu-img map" 60 $QEMU_IMG map "$TEST_IMG" | _filter_testdir 61done 62 63echo 64echo "### Test 'qemu-io -c discard' on a QCOW2 image with a backing file" 65echo 66 67echo "# Create a backing image and fill it with data" 68BACKING_IMG="$TEST_IMG.base" 69TEST_IMG="$BACKING_IMG" _make_test_img 128k 70$QEMU_IO -c 'write -P 0xff 0 128k' "$BACKING_IMG" | _filter_qemu_io 71 72for qcow2_compat in 0.10 1.1; do 73 echo "# Create an image with compat=$qcow2_compat and a backing file" 74 _make_test_img -o "compat=$qcow2_compat" -b "$BACKING_IMG" 75 76 echo "# Fill all clusters with data and then discard them" 77 $QEMU_IO -c 'write -P 0x01 0 128k' "$TEST_IMG" | _filter_qemu_io 78 $QEMU_IO -c 'discard 0 128k' "$TEST_IMG" | _filter_qemu_io 79 80 echo "# Read the data from the discarded clusters" 81 if [ "$qcow2_compat" = "1.1" ]; then 82 # In qcow2 v3 clusters are zeroed (with QCOW_OFLAG_ZERO) 83 $QEMU_IO -c 'read -P 0x00 0 128k' "$TEST_IMG" | _filter_qemu_io 84 else 85 # In qcow2 v2 if there's a backing image we cannot zero the clusters 86 # without exposing the backing file data so discard does nothing 87 $QEMU_IO -c 'read -P 0x01 0 128k' "$TEST_IMG" | _filter_qemu_io 88 fi 89 90 echo "# Output of qemu-img map" 91 $QEMU_IMG map "$TEST_IMG" | _filter_testdir 92done 93 94# success, all done 95echo "*** done" 96rm -f $seq.full 97status=0 98