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