4 # Test how 'qemu-io -c discard' behaves on v2 and v3 qcow2 images
6 # Copyright (C) 2020 Igalia, S.L.
7 # Author: Alberto Garcia <berto@igalia.com>
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.
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.
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/>.
24 owner=berto@igalia.com
27 echo "QA output created by $seq"
29 status=1 # failure is the default!
35 trap "_cleanup; exit \$status" 0 1 2 3 15
37 # get standard environment, filters and checks
42 _supported_proto file fuse
44 _unsupported_imgopts 'compat=0.10' refcount_bits data_file compression_type
47 echo "### Test 'qemu-io -c discard' on a QCOW2 image without a backing file"
49 for qcow2_compat in 0.10 1.1; do
50 echo "# Create an image with compat=$qcow2_compat without a backing file"
51 _make_test_img -o "compat=$qcow2_compat" 128k
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
57 echo "# Read the data from the discarded clusters"
58 $QEMU_IO -c 'read -P 0x00 0 128k' "$TEST_IMG" | _filter_qemu_io
60 echo "# Output of qemu-img map"
61 $QEMU_IMG map "$TEST_IMG" | _filter_testdir
65 echo "### Test 'qemu-io -c discard' on a QCOW2 image with a backing file"
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
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
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
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
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
91 echo "# Output of qemu-img map"
92 $QEMU_IMG map "$TEST_IMG" | _filter_testdir