1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
|
#!/usr/bin/env bash
#
# Test that backing files can be smaller than the image
#
# Copyright (C) 2010 IBM, Corp.
#
# Based on 017:
# Copyright (C) 2009 Red Hat, Inc.
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
#
# creator
owner=stefanha@linux.vnet.ibm.com
seq=`basename $0`
echo "QA output created by $seq"
status=1 # failure is the default!
_cleanup()
{
_cleanup_qemu
_rm_test_img "${TEST_IMG}.copy"
_cleanup_test_img
}
trap "_cleanup; exit \$status" 0 1 2 3 15
# get standard environment, filters and checks
. ./common.rc
. ./common.filter
. ./common.pattern
. ./common.qemu
# Any format supporting backing files except vmdk and qcow which do not support
# smaller backing files.
_supported_fmt qcow2 qed
_supported_proto file
_supported_os Linux
# Choose a size that is not necessarily a cluster size multiple for image
# formats that use clusters. This will ensure that the base image doesn't end
# precisely on a cluster boundary (the easy case).
image_size=$(( 4 * 1024 * 1024 * 1024 + 3 * 512 ))
# The base image is smaller than the image file
base_size=$(( image_size - 1024 * 1024 * 1024 ))
offset=$(( base_size - 32 * 1024 ))
TEST_IMG_SAVE="$TEST_IMG"
TEST_IMG="$TEST_IMG.base"
_make_test_img $base_size
echo "Filling base image"
echo
# Fill end of base image with a pattern, skipping every other sector
io writev $offset 512 1024 32
_check_test_img
echo "Creating test image with backing file"
echo
TEST_IMG="$TEST_IMG_SAVE"
_make_test_img -b "$TEST_IMG.base" -F $IMGFMT $image_size
echo "Filling test image"
echo
# Write every other sector around where the base image ends
io writev $(( offset + 512 )) 512 1024 64
_check_test_img
echo "Reading"
echo
# Base image sectors
io readv $(( offset )) 512 1024 32
# Image sectors
io readv $(( offset + 512 )) 512 1024 64
# Zero sectors beyond end of base image
io_zero readv $(( offset + 32 * 1024 )) 512 1024 32
_check_test_img
# Rebase it on top of its base image
$QEMU_IMG rebase -b "$TEST_IMG.base" -F $IMGFMT "$TEST_IMG"
echo
echo block-backup
echo
qemu_comm_method="monitor"
_launch_qemu -drive file="${TEST_IMG}",cache=${CACHEMODE},aio=${AIOMODE},id=disk
h=$QEMU_HANDLE
if [ "${VALGRIND_QEMU}" == "y" ]; then
QEMU_COMM_TIMEOUT=7
else
QEMU_COMM_TIMEOUT=1
fi
# Silence output since it contains the disk image path and QEMU's readline
# character echoing makes it very hard to filter the output. Plus, there
# is no telling how many times the command will repeat before succeeding.
# (Note that creating the image results in a "Formatting..." message over
# stdout, which is the same channel the monitor uses. We cannot reliably
# wait for it because the monitor output may interact with it in such a
# way that _timed_wait_for cannot read it. However, once the block job is
# done, we know that the "Formatting..." message must have appeared
# already, so the output is still deterministic.)
silent=y _send_qemu_cmd $h "drive_backup disk ${TEST_IMG}.copy" "(qemu)"
silent=y qemu_cmd_repeat=20 _send_qemu_cmd $h "info block-jobs" "No active jobs"
_send_qemu_cmd $h "info block-jobs" "No active jobs"
_send_qemu_cmd $h 'quit' ""
# Base image sectors
TEST_IMG="${TEST_IMG}.copy" io readv $(( offset )) 512 1024 32
# Image sectors
TEST_IMG="${TEST_IMG}.copy" io readv $(( offset + 512 )) 512 1024 64
# Zero sectors beyond end of base image
TEST_IMG="${TEST_IMG}.copy" io_zero readv $(( offset + 32 * 1024 )) 512 1024 32
_check_test_img
echo
echo '=== Reading across backing EOF in one operation ==='
echo
# Use a cluster boundary as the base end here
base_size=$((3 * 1024 * 1024 * 1024))
TEST_IMG="$TEST_IMG.base" _make_test_img $base_size
_make_test_img -b "$TEST_IMG.base" -F $IMGFMT $image_size
# Write 16 times 42 at the end of the base image
$QEMU_IO -c "write -P 42 $((base_size - 16)) 16" "$TEST_IMG.base" \
| _filter_qemu_io
# Read 32 bytes across the base EOF from the top;
# should be 16 times 0x2a, then 16 times 0x00
$QEMU_IO -c "read -v $((base_size - 16)) 32" "$TEST_IMG" \
| _filter_qemu_io
# success, all done
echo "*** done"
rm -f $seq.full
status=0
|
