xref: /qemu/tests/qemu-iotests/033 (revision 00382fa8) 
1#!/bin/bash
2#
3# Test aligned and misaligned write zeroes operations.
4#
5# Copyright (C) 2012 Red Hat, Inc.
6#
7# This program is free software; you can redistribute it and/or modify
8# it under the terms of the GNU General Public License as published by
9# the Free Software Foundation; either version 2 of the License, or
10# (at your option) any later version.
11#
12# This program is distributed in the hope that it will be useful,
13# but WITHOUT ANY WARRANTY; without even the implied warranty of
14# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15# GNU General Public License for more details.
16#
17# You should have received a copy of the GNU General Public License
18# along with this program.  If not, see <http://www.gnu.org/licenses/>.
19#
20
21# creator
22owner=pbonzini@redhat.com
23
24seq=`basename $0`
25echo "QA output created by $seq"
26
27status=1	# failure is the default!
28
29_cleanup()
30{
31	_cleanup_test_img
32}
33trap "_cleanup; exit \$status" 0 1 2 3 15
34
35# get standard environment, filters and checks
36. ./common.rc
37. ./common.filter
38
39_supported_fmt generic
40_supported_proto generic
41_supported_os Linux
42
43
44size=128M
45_make_test_img $size
46
47do_test()
48{
49	local align=$1
50	local iocmd=$2
51	local img=$3
52	if [ "$IMGOPTSSYNTAX" = "true" ]
53	then
54	    IO_OPEN_ARG="$img"
55	    IO_EXTRA_ARGS="--image-opts"
56	else
57	    IO_OPEN_ARG="-o driver=$IMGFMT,file.align=$align blkdebug::$img"
58	    IO_EXTRA_ARGS=""
59	fi
60	{
61		echo "open $IO_OPEN_ARG"
62		echo $iocmd
63	} | $QEMU_IO $IO_EXTRA_ARGS
64}
65
66echo
67echo "=== Test aligned and misaligned write zeroes operations ==="
68
69for write_zero_cmd in "write -z" "aio_write -z"; do
70for align in 512 4k; do
71	echo
72	echo "== preparing image =="
73	do_test $align "write -P 0xa 0x200 0x400" "$TEST_IMG" | _filter_qemu_io
74	do_test $align "write -P 0xa 0x20000 0x600" "$TEST_IMG" | _filter_qemu_io
75	do_test $align "$write_zero_cmd 0x400 0x20000" "$TEST_IMG" | _filter_qemu_io
76
77	echo
78	echo "== verifying patterns (1) =="
79	do_test $align "read -P 0xa 0x200 0x200" "$TEST_IMG" | _filter_qemu_io
80	do_test $align "read -P 0x0 0x400 0x20000" "$TEST_IMG" | _filter_qemu_io
81	do_test $align "read -P 0xa 0x20400 0x200" "$TEST_IMG" | _filter_qemu_io
82
83	echo
84	echo "== rewriting zeroes =="
85	do_test $align "write -P 0xb 0x10000 0x10000" "$TEST_IMG" | _filter_qemu_io
86	do_test $align "$write_zero_cmd 0x10000 0x10000" "$TEST_IMG" | _filter_qemu_io
87
88	echo
89	echo "== verifying patterns (2) =="
90	do_test $align "read -P 0x0 0x400 0x20000" "$TEST_IMG" | _filter_qemu_io
91
92	echo
93	echo "== rewriting unaligned zeroes =="
94	do_test $align "write -P 0xb 0x0 0x1000" "$TEST_IMG" | _filter_qemu_io
95	do_test $align "$write_zero_cmd 0x200 0x200" "$TEST_IMG" | _filter_qemu_io
96
97	echo
98	echo "== verifying patterns (3) =="
99	do_test $align "read -P 0xb 0x0 0x200" "$TEST_IMG" | _filter_qemu_io
100	do_test $align "read -P 0x0 0x200 0x200" "$TEST_IMG" | _filter_qemu_io
101	do_test $align "read -P 0xb 0x400 0xc00" "$TEST_IMG" | _filter_qemu_io
102
103	echo
104done
105done
106
107_cleanup_test_img
108
109# Trigger truncate that would shrink qcow2 L1 table, which is done by
110#   clearing one entry (8 bytes) with bdrv_co_pwrite_zeroes()
111
112echo
113echo "=== Test misaligned write zeroes via truncate ==="
114echo
115
116# any size will do, but the smaller the size the smaller the required image
117CLUSTER_SIZE=$((4 * 1024))
118L2_COVERAGE=$(($CLUSTER_SIZE * $CLUSTER_SIZE / 8))
119_make_test_img $(($L2_COVERAGE * 2))
120
121do_test 512 "write -P 1 0 0x200" "$TEST_IMG" | _filter_qemu_io
122# next L2 table
123do_test 512 "write -P 1 $L2_COVERAGE 0x200" "$TEST_IMG" | _filter_qemu_io
124
125# only interested in qcow2 here; also other formats might respond with
126#  "not supported" error message
127if [ $IMGFMT = "qcow2" ]; then
128    do_test 512 "truncate $L2_COVERAGE" "$TEST_IMG" | _filter_qemu_io
129fi
130
131do_test 512 "read -P 1 0 0x200" "$TEST_IMG" | _filter_qemu_io
132
133# success, all done
134echo
135echo "*** done"
136rm -f $seq.full
137status=0
138