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