xref: /openbmc/qemu/tests/qemu-iotests/290 (revision 6e0bc06e)
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 $seq"
28
29status=1    # failure is the default!
30
31_cleanup()
32{
33    _cleanup_test_img
34}
35trap "_cleanup; exit \$status" 0 1 2 3 15
36
37# get standard environment, filters and checks
38. ./common.rc
39. ./common.filter
40
41_supported_fmt qcow2
42_supported_proto file fuse
43_supported_os Linux
44_unsupported_imgopts 'compat=0.10' refcount_bits data_file
45
46echo
47echo "### Test 'qemu-io -c discard' on a QCOW2 image without a backing file"
48echo
49for qcow2_compat in 0.10 1.1; do
50    echo "# Create an image with compat=$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