xref: /openbmc/qemu/tests/qemu-iotests/176 (revision 8f0a3716)
1#!/bin/bash
2#
3# Commit changes into backing chains and empty the top image if the
4# backing image is not explicitly specified.
5#
6# Variant of 097, which includes snapshots and persistent bitmaps, to
7# tickle the slow codepath in qcow2. See also 198, for another feature
8# that tickles the slow codepath.
9#
10# Copyright (C) 2014, 2017 Red Hat, Inc.
11#
12# This program is free software; you can redistribute it and/or modify
13# it under the terms of the GNU General Public License as published by
14# the Free Software Foundation; either version 2 of the License, or
15# (at your option) any later version.
16#
17# This program is distributed in the hope that it will be useful,
18# but WITHOUT ANY WARRANTY; without even the implied warranty of
19# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
20# GNU General Public License for more details.
21#
22# You should have received a copy of the GNU General Public License
23# along with this program.  If not, see <http://www.gnu.org/licenses/>.
24#
25
26# creator
27owner=mreitz@redhat.com
28
29seq="$(basename $0)"
30echo "QA output created by $seq"
31
32here="$PWD"
33status=1	# failure is the default!
34
35_cleanup()
36{
37    _cleanup_test_img
38    _rm_test_img "$TEST_IMG.itmd"
39}
40trap "_cleanup; exit \$status" 0 1 2 3 15
41
42# get standard environment, filters and checks
43. ./common.rc
44. ./common.filter
45. ./common.pattern
46
47# This test is specific to qcow2
48_supported_fmt qcow2
49_supported_proto file
50_supported_os Linux
51# Persistent dirty bitmaps require compat=1.1
52_unsupported_imgopts 'compat=0.10'
53
54function run_qemu()
55{
56    $QEMU -nographic -qmp stdio -serial none "$@" 2>&1 \
57	| _filter_testdir | _filter_qmp | _filter_qemu \
58        | sed 's/"sha256": ".\{64\}"/"sha256": HASH/'
59}
60
61for reason in snapshot bitmap; do
62
63# Four passes:
64#  0: Two-layer backing chain, commit to upper backing file (implicitly)
65#     (in this case, the top image will be emptied)
66#  1: Two-layer backing chain, commit to upper backing file (explicitly)
67#     (in this case, the top image will implicitly stay unchanged)
68#  2: Two-layer backing chain, commit to upper backing file (implicitly with -d)
69#     (in this case, the top image will explicitly stay unchanged)
70#  3: Two-layer backing chain, commit to lower backing file
71#     (in this case, the top image will implicitly stay unchanged)
72#
73# 020 already tests committing, so this only tests whether image chains are
74# working properly and that all images above the base are emptied; therefore,
75# no complicated patterns are necessary.  Check near the 2G mark, as qcow2
76# has been buggy at that boundary in the past.
77for i in 0 1 2 3; do
78
79echo
80echo "=== Test pass $reason.$i ==="
81echo
82
83len=$((2100 * 1024 * 1024 + 512)) # larger than 2G, and not cluster aligned
84TEST_IMG="$TEST_IMG.base" _make_test_img $len
85TEST_IMG="$TEST_IMG.itmd" _make_test_img -b "$TEST_IMG.base" $len
86_make_test_img -b "$TEST_IMG.itmd" $len
87# Update the top image to use a feature that is incompatible with fast path
88case $reason in
89    snapshot) $QEMU_IMG snapshot -c snap "$TEST_IMG" ;;
90    bitmap)
91	run_qemu <<EOF
92{ "execute": "qmp_capabilities" }
93{ "execute": "blockdev-add",
94  "arguments": { "driver": "qcow2", "node-name": "drive0",
95     "file": { "driver": "file", "filename": "$TEST_IMG" } } }
96{ "execute": "block-dirty-bitmap-add",
97  "arguments": { "node": "drive0", "name": "bitmap0",
98     "persistent": true, "autoload": true } }
99{ "execute": "quit" }
100EOF
101	;;
102esac
103
104$QEMU_IO -c "write -P 1 0x7ffd0000 192k" "$TEST_IMG.base" | _filter_qemu_io
105$QEMU_IO -c "write -P 2 0x7ffe0000 128k" "$TEST_IMG.itmd" | _filter_qemu_io
106$QEMU_IO -c "write -P 3 0x7fff0000 64k" "$TEST_IMG" | _filter_qemu_io
107$QEMU_IO -c "write -P 4 $(($len - 512)) 512" "$TEST_IMG" | _filter_qemu_io
108
109if [ $i -lt 3 ]; then
110    if [ $i == 0 ]; then
111        # -b "$TEST_IMG.itmd" should be the default (that is, committing to the
112        # first backing file in the chain)
113        $QEMU_IMG commit "$TEST_IMG"
114    elif [ $i == 1 ]; then
115        # explicitly specify the commit target (this should imply -d)
116        $QEMU_IMG commit -b "$TEST_IMG.itmd" "$TEST_IMG"
117    else
118        # do not explicitly specify the commit target, but use -d to leave the
119        # top image unchanged
120        $QEMU_IMG commit -d "$TEST_IMG"
121    fi
122
123    # Bottom should be unchanged
124    $QEMU_IO -c 'read -P 1 0x7ffd0000 192k' "$TEST_IMG.base" | _filter_qemu_io
125    $QEMU_IO -c "read -P 0 $((len - 512)) 512" "$TEST_IMG.base" | _filter_qemu_io
126
127    # Intermediate should contain changes from top
128    $QEMU_IO -c 'read -P 1 0x7ffd0000 64k' "$TEST_IMG.itmd" | _filter_qemu_io
129    $QEMU_IO -c 'read -P 2 0x7ffe0000 64k' "$TEST_IMG.itmd" | _filter_qemu_io
130    $QEMU_IO -c 'read -P 3 0x7fff0000 64k' "$TEST_IMG.itmd" | _filter_qemu_io
131    $QEMU_IO -c "read -P 4 $((len - 512)) 512" "$TEST_IMG.itmd" | _filter_qemu_io
132
133    # And in pass 0, the top image should be empty, whereas in both other passes
134    # it should be unchanged (which is both checked by qemu-img map)
135else
136    $QEMU_IMG commit -b "$TEST_IMG.base" "$TEST_IMG"
137
138    # Bottom should contain all changes
139    $QEMU_IO -c 'read -P 1 0x7ffd0000 64k' "$TEST_IMG.base" | _filter_qemu_io
140    $QEMU_IO -c 'read -P 2 0x7ffe0000 64k' "$TEST_IMG.base" | _filter_qemu_io
141    $QEMU_IO -c 'read -P 3 0x7fff0000 64k' "$TEST_IMG.base" | _filter_qemu_io
142    $QEMU_IO -c "read -P 4 $((len - 512)) 512" "$TEST_IMG.base" | _filter_qemu_io
143
144    # Both top and intermediate should be unchanged
145fi
146
147$QEMU_IMG map "$TEST_IMG.base" | _filter_qemu_img_map
148$QEMU_IMG map "$TEST_IMG.itmd" | _filter_qemu_img_map
149$QEMU_IMG map "$TEST_IMG" | _filter_qemu_img_map
150
151# Check that the reason for slow path is still present, as appropriate
152case $reason in
153    snapshot)
154	$QEMU_IMG snapshot -l "$TEST_IMG" |
155	    sed 's/^\(.\{20\}\).*/\1/; s/ *$//' ;;
156    bitmap)
157	run_qemu <<EOF
158{ "execute": "qmp_capabilities" }
159{ "execute": "blockdev-add",
160  "arguments": { "driver": "qcow2", "node-name": "drive0",
161     "file": { "driver": "file", "filename": "$TEST_IMG" } } }
162{ "execute": "x-debug-block-dirty-bitmap-sha256",
163  "arguments": { "node": "drive0", "name": "bitmap0" } }
164{ "execute": "quit" }
165EOF
166	;;
167esac
168
169done
170done
171
172# success, all done
173echo "*** done"
174rm -f $seq.full
175status=0
176