1#!/usr/bin/env bash 2# group: rw auto quick 3# 4# Test how 'qemu-io -c discard' behaves on v2 and v3 qcow2 images 5# 6# Copyright (C) 2020 Igalia, S.L. 7# Author: Alberto Garcia <berto@igalia.com> 8# 9# This program is free software; you can redistribute it and/or modify 10# it under the terms of the GNU General Public License as published by 11# the Free Software Foundation; either version 2 of the License, or 12# (at your option) any later version. 13# 14# This program is distributed in the hope that it will be useful, 15# but WITHOUT ANY WARRANTY; without even the implied warranty of 16# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 17# GNU General Public License for more details. 18# 19# You should have received a copy of the GNU General Public License 20# along with this program. If not, see <http://www.gnu.org/licenses/>. 21# 22 23# creator 24owner=berto@igalia.com 25 26seq=`basename $0` 27echo "QA output created by $seq" 28 29status=1 # failure is the default! 30 31_cleanup() 32{ 33 _cleanup_test_img 34} 35trap "_cleanup; exit \$status" 0 1 2 3 15 36 37# get standard environment, filters and checks 38. ./common.rc 39. ./common.filter 40 41_supported_fmt qcow2 42_supported_proto file fuse 43_supported_os Linux 44_unsupported_imgopts 'compat=0.10' refcount_bits data_file compression_type 45 46echo 47echo "### Test 'qemu-io -c discard' on a QCOW2 image without a backing file" 48echo 49for qcow2_compat in 0.10 1.1; do 50 echo "# Create an image with compat=$qcow2_compat without a backing file" 51 _make_test_img -o "compat=$qcow2_compat" 128k 52 53 echo "# Fill all clusters with data and then discard them" 54 $QEMU_IO -c 'write -P 0x01 0 128k' "$TEST_IMG" | _filter_qemu_io 55 $QEMU_IO -c 'discard 0 128k' "$TEST_IMG" | _filter_qemu_io 56 57 echo "# Read the data from the discarded clusters" 58 $QEMU_IO -c 'read -P 0x00 0 128k' "$TEST_IMG" | _filter_qemu_io 59 60 echo "# Output of qemu-img map" 61 $QEMU_IMG map "$TEST_IMG" | _filter_testdir 62done 63 64echo 65echo "### Test 'qemu-io -c discard' on a QCOW2 image with a backing file" 66echo 67 68echo "# Create a backing image and fill it with data" 69BACKING_IMG="$TEST_IMG.base" 70TEST_IMG="$BACKING_IMG" _make_test_img 128k 71$QEMU_IO -c 'write -P 0xff 0 128k' "$BACKING_IMG" | _filter_qemu_io 72 73for qcow2_compat in 0.10 1.1; do 74 echo "# Create an image with compat=$qcow2_compat and a backing file" 75 _make_test_img -o "compat=$qcow2_compat" -b "$BACKING_IMG" -F $IMGFMT 76 77 echo "# Fill all clusters with data and then discard them" 78 $QEMU_IO -c 'write -P 0x01 0 128k' "$TEST_IMG" | _filter_qemu_io 79 $QEMU_IO -c 'discard 0 128k' "$TEST_IMG" | _filter_qemu_io 80 81 echo "# Read the data from the discarded clusters" 82 if [ "$qcow2_compat" = "1.1" ]; then 83 # In qcow2 v3 clusters are zeroed (with QCOW_OFLAG_ZERO) 84 $QEMU_IO -c 'read -P 0x00 0 128k' "$TEST_IMG" | _filter_qemu_io 85 else 86 # In qcow2 v2 if there's a backing image we cannot zero the clusters 87 # without exposing the backing file data so discard does nothing 88 $QEMU_IO -c 'read -P 0x01 0 128k' "$TEST_IMG" | _filter_qemu_io 89 fi 90 91 echo "# Output of qemu-img map" 92 $QEMU_IMG map "$TEST_IMG" | _filter_testdir 93done 94 95# success, all done 96echo "*** done" 97rm -f $seq.full 98status=0 99