xref: /openbmc/qemu/tests/qemu-iotests/097 (revision 2b74dd91)
1#!/usr/bin/env bash
2# group: rw auto backing
3#
4# Commit changes into backing chains and empty the top image if the
5# backing image is not explicitly specified
6#
7# Copyright (C) 2014 Red Hat, Inc.
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=hreitz@redhat.com
25
26seq="$(basename $0)"
27echo "QA output created by $seq"
28
29status=1	# failure is the default!
30
31_cleanup()
32{
33    _cleanup_test_img
34    _rm_test_img "$TEST_IMG.itmd"
35}
36trap "_cleanup; exit \$status" 0 1 2 3 15
37
38# get standard environment, filters and checks
39. ./common.rc
40. ./common.filter
41. ./common.pattern
42
43# Any format supporting backing files and bdrv_make_empty
44_supported_fmt qcow qcow2
45_supported_proto file fuse
46_supported_os Linux
47
48
49# Four main passes:
50#  0: Two-layer backing chain, commit to upper backing file (implicitly)
51#     (in this case, the top image will be emptied)
52#  1: Two-layer backing chain, commit to upper backing file (explicitly)
53#     (in this case, the top image will implicitly stay unchanged)
54#  2: Two-layer backing chain, commit to upper backing file (implicitly with -d)
55#     (in this case, the top image will explicitly stay unchanged)
56#  3: Two-layer backing chain, commit to lower backing file
57#     (in this case, the top image will implicitly stay unchanged)
58#
59# 020 already tests committing, so this only tests whether image chains are
60# working properly and that all images above the base are emptied; therefore,
61# no complicated patterns are necessary.  Check near the 2G mark, as qcow2
62# has been buggy at that boundary in the past.
63for i in 0 1 2 3; do
64
65echo
66echo "=== Test pass $i ==="
67echo
68
69len=$((2100 * 1024 * 1024 + 512)) # larger than 2G, and not cluster aligned
70TEST_IMG="$TEST_IMG.base" _make_test_img $len
71TEST_IMG="$TEST_IMG.itmd" _make_test_img -b "$TEST_IMG.base" -F $IMGFMT $len
72_make_test_img -b "$TEST_IMG.itmd" -F $IMGFMT $len
73
74$QEMU_IO -c "write -P 1 0x7ffd0000 192k" "$TEST_IMG.base" | _filter_qemu_io
75$QEMU_IO -c "write -P 2 0x7ffe0000 128k" "$TEST_IMG.itmd" | _filter_qemu_io
76$QEMU_IO -c "write -P 3 0x7fff0000 64k" "$TEST_IMG" | _filter_qemu_io
77$QEMU_IO -c "write -P 4 $(($len - 512)) 512" "$TEST_IMG" | _filter_qemu_io
78
79if [ $i -lt 3 ]; then
80    if [ $i == 0 ]; then
81        # -b "$TEST_IMG.itmd" should be the default (that is, committing to the
82        # first backing file in the chain)
83        $QEMU_IMG commit "$TEST_IMG"
84    elif [ $i == 1 ]; then
85        # explicitly specify the commit target (this should imply -d)
86        $QEMU_IMG commit -b "$TEST_IMG.itmd" "$TEST_IMG"
87    else
88        # do not explicitly specify the commit target, but use -d to leave the
89        # top image unchanged
90        $QEMU_IMG commit -d "$TEST_IMG"
91    fi
92
93    # Bottom should be unchanged
94    $QEMU_IO -c 'read -P 1 0x7ffd0000 192k' "$TEST_IMG.base" | _filter_qemu_io
95    $QEMU_IO -c "read -P 0 $((len - 512)) 512" "$TEST_IMG.base" | _filter_qemu_io
96
97    # Intermediate should contain changes from top
98    $QEMU_IO -c 'read -P 1 0x7ffd0000 64k' "$TEST_IMG.itmd" | _filter_qemu_io
99    $QEMU_IO -c 'read -P 2 0x7ffe0000 64k' "$TEST_IMG.itmd" | _filter_qemu_io
100    $QEMU_IO -c 'read -P 3 0x7fff0000 64k' "$TEST_IMG.itmd" | _filter_qemu_io
101    $QEMU_IO -c "read -P 4 $((len - 512)) 512" "$TEST_IMG.itmd" | _filter_qemu_io
102
103    # And in pass 0, the top image should be empty, whereas in both other passes
104    # it should be unchanged (which is both checked by qemu-img map)
105else
106    $QEMU_IMG commit -b "$TEST_IMG.base" "$TEST_IMG"
107
108    # Bottom should contain all changes
109    $QEMU_IO -c 'read -P 1 0x7ffd0000 64k' "$TEST_IMG.base" | _filter_qemu_io
110    $QEMU_IO -c 'read -P 2 0x7ffe0000 64k' "$TEST_IMG.base" | _filter_qemu_io
111    $QEMU_IO -c 'read -P 3 0x7fff0000 64k' "$TEST_IMG.base" | _filter_qemu_io
112    $QEMU_IO -c "read -P 4 $((len - 512)) 512" "$TEST_IMG.base" | _filter_qemu_io
113
114    # Both top and intermediate should be unchanged
115fi
116
117$QEMU_IMG map "$TEST_IMG.base" | _filter_qemu_img_map
118$QEMU_IMG map "$TEST_IMG.itmd" | _filter_qemu_img_map
119$QEMU_IMG map "$TEST_IMG" | _filter_qemu_img_map
120
121done
122
123
124# success, all done
125echo "*** done"
126rm -f $seq.full
127status=0
128