xref: /openbmc/qemu/tests/qemu-iotests/066 (revision 812b31d3)
1#!/usr/bin/env bash
2# group: rw auto quick
3#
4# Test case for preallocated zero clusters in qcow2
5#
6# Copyright (C) 2013 Red Hat, Inc.
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=mreitz@redhat.com
24
25seq="$(basename $0)"
26echo "QA output created by $seq"
27
28status=1	# failure is the default!
29
30_cleanup()
31{
32	_cleanup_test_img
33}
34trap "_cleanup; exit \$status" 0 1 2 3 15
35
36# get standard environment, filters and checks
37. ./common.rc
38. ./common.filter
39
40# This tests qcow2-specific low-level functionality
41_supported_fmt qcow2
42_supported_proto generic
43# We need zero clusters and snapshots
44# (TODO: Consider splitting the snapshot part into a separate test
45#        file, so this one runs with refcount_bits=1 and data_file)
46_unsupported_imgopts 'compat=0.10' 'refcount_bits=1[^0-9]' data_file
47
48# Intentionally create an unaligned image
49IMG_SIZE=$((64 * 1024 * 1024 + 512))
50
51echo
52echo "=== Testing cluster discards ==="
53echo
54_make_test_img $IMG_SIZE
55# Write some normal clusters, zero some of them (creating preallocated
56# zero clusters) and discard everything. Everything should now read as 0.
57$QEMU_IO -c "write 0 256k" -c "write -z 0 256k" -c "write 64M 512" \
58	 -c "discard 0 $IMG_SIZE" -c "read -P 0 0 $IMG_SIZE" "$TEST_IMG" \
59         | _filter_qemu_io
60
61# Check the image (there shouldn't be any leaks)
62_check_test_img
63# Map the image (we want all clusters to be gone)
64$QEMU_IMG map "$TEST_IMG"
65
66_cleanup_test_img
67
68
69echo
70echo '=== Writing to preallocated zero clusters ==='
71echo
72
73_make_test_img $IMG_SIZE
74
75# Create data clusters (not aligned to an L2 table)
76$QEMU_IO -c 'write -P 42 1M 256k' "$TEST_IMG" | _filter_qemu_io
77orig_map=$($QEMU_IMG map --output=json "$TEST_IMG")
78
79# Convert the data clusters to preallocated zero clusters
80$QEMU_IO -c 'write -z 1M 256k' "$TEST_IMG" | _filter_qemu_io
81
82# Now write to them (with a COW needed for the head and tail)
83$QEMU_IO -c "write -P 23 $(((1024 + 32) * 1024)) 192k" "$TEST_IMG" \
84    | _filter_qemu_io
85
86# Check metadata correctness
87_check_test_img
88
89# Check data correctness
90$QEMU_IO -c "read -P  0 $(( 1024             * 1024)) 32k" \
91         -c "read -P 23 $(((1024 + 32)       * 1024)) 192k" \
92         -c "read -P  0 $(((1024 + 32 + 192) * 1024)) 32k" \
93         "$TEST_IMG" \
94         | _filter_qemu_io
95
96# Check that we have actually reused the original area
97new_map=$($QEMU_IMG map --output=json "$TEST_IMG")
98if [ "$new_map" = "$orig_map" ]; then
99    echo 'Successfully reused original clusters.'
100else
101    echo 'Failed to reuse original clusters.'
102    echo 'Original map:'
103    echo "$orig_map"
104    echo 'New map:'
105    echo "$new_map"
106fi
107
108_cleanup_test_img
109
110
111echo
112echo '=== Writing to a snapshotted preallocated zero cluster ==='
113echo
114
115_make_test_img 64k
116
117# Create a preallocated zero cluster
118$QEMU_IO -c 'write -P 42 0 64k' -c 'write -z 0 64k' "$TEST_IMG" \
119    | _filter_qemu_io
120
121# Snapshot it
122$QEMU_IMG snapshot -c foo "$TEST_IMG"
123
124# Write to the cluster
125$QEMU_IO -c 'write -P 23 0 64k' "$TEST_IMG" | _filter_qemu_io
126
127# Check metadata correctness
128_check_test_img
129
130# Check data correctness
131$QEMU_IO -c 'read -P 23 0 64k' "$TEST_IMG" | _filter_qemu_io
132$QEMU_IMG snapshot -a foo "$TEST_IMG"
133$QEMU_IO -c 'read -P 0 0 64k' "$TEST_IMG" | _filter_qemu_io
134
135_cleanup_test_img
136
137
138echo
139echo '=== Consecutive write to a preallocated zero cluster ==='
140echo
141
142_make_test_img 192k
143
144# Create three normal clusters
145$QEMU_IO -c 'write -P 42 0 192k' "$TEST_IMG" | _filter_qemu_io
146orig_map=$($QEMU_IMG map --output=json "$TEST_IMG")
147
148# Make the middle cluster a preallocated zero cluster
149$QEMU_IO -c 'write -z 64k 64k' "$TEST_IMG" | _filter_qemu_io
150
151# Try to overwrite everything: This should reuse the whole range. To test that
152# this only issues a single continuous write request, use blkdebug.
153$QEMU_IO -c 'write -P 42 0 192k' \
154    "json:{
155        'driver': '$IMGFMT',
156        'file': {
157            'driver': 'blkdebug',
158            'image.filename': '$TEST_IMG',
159            'set-state': [{
160                'event': 'write_aio',
161                'new_state': 2
162            }],
163            'inject-error': [{
164                'event': 'write_aio',
165                'state': 2
166            }]
167        }
168    }" \
169    | _filter_qemu_io
170
171# Check metadata correctness
172_check_test_img
173
174# Check that we have actually reused the original area
175new_map=$($QEMU_IMG map --output=json "$TEST_IMG")
176if [ "$new_map" = "$orig_map" ]; then
177    echo 'Successfully reused original clusters.'
178else
179    echo 'Failed to reuse original clusters.'
180    echo 'Original map:'
181    echo "$orig_map"
182    echo 'New map:'
183    echo "$new_map"
184fi
185
186_cleanup_test_img
187
188
189# success, all done
190echo "*** done"
191rm -f $seq.full
192status=0
193