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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 24 owner=berto@igalia.com 25 26 seq=`basename $0` 27 echo "QA output created by $seq" 28 29 status=1 # failure is the default! 30 31 _cleanup() 32 { 33 _cleanup_test_img 34 } 35 trap "_cleanup; exit \$status" 0 1 2 3 15 36 37 # get standard environment, filters and checks 38 . ./common.rc 39 . ./common.filter 40 41 _supported_fmt qcow2 42 _supported_proto file fuse 43 _supported_os Linux 44 _unsupported_imgopts 'compat=0.10' refcount_bits data_file compression_type 45 46 echo 47 echo "### Test 'qemu-io -c discard' on a QCOW2 image without a backing file" 48 echo 49 for qcow2_compat in 0.10 1.1; do 50 echo "# Create an image with compat=$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 62 done 63 64 echo 65 echo "### Test 'qemu-io -c discard' on a QCOW2 image with a backing file" 66 echo 67 68 echo "# Create a backing image and fill it with data" 69 BACKING_IMG="$TEST_IMG.base" 70 TEST_IMG="$BACKING_IMG" _make_test_img 128k 71 $QEMU_IO -c 'write -P 0xff 0 128k' "$BACKING_IMG" | _filter_qemu_io 72 73 for 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 93 done 94 95 # success, all done 96 echo "*** done" 97 rm -f $seq.full 98 status=0