xref: /qemu/tests/qemu-iotests/033 (revision 727385c4) 
1#!/usr/bin/env bash
2# group: rw auto quick
3#
4# Test aligned and misaligned write zeroes operations.
5#
6# Copyright (C) 2012 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=pbonzini@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}
34trap "_cleanup; exit \$status" 0 1 2 3 15
35
36# get standard environment, filters and checks
37. ./common.rc
38. ./common.filter
39
40_supported_fmt generic
41_supported_proto generic
42_unsupported_imgopts "subformat=streamOptimized"
43
44
45size=128M
46_make_test_img $size
47
48do_test()
49{
50	local align=$1
51	local iocmd=$2
52	local img=$3
53	if [ "$IMGOPTSSYNTAX" = "true" ]
54	then
55	    IO_OPEN_ARG="$img"
56	    IO_EXTRA_ARGS="--image-opts"
57	else
58	    IO_OPEN_ARG="-o driver=$IMGFMT,file.align=$align blkdebug::$img"
59	    IO_EXTRA_ARGS=""
60	fi
61	{
62		echo "open $IO_OPEN_ARG"
63		echo $iocmd
64	} | $QEMU_IO $IO_EXTRA_ARGS
65}
66
67echo
68echo "=== Test aligned and misaligned write zeroes operations ==="
69
70for write_zero_cmd in "write -z" "aio_write -z"; do
71for align in 512 4k; do
72	echo
73	echo "== preparing image =="
74	do_test $align "write -P 0xa 0x200 0x400" "$TEST_IMG" | _filter_qemu_io
75	do_test $align "write -P 0xa 0x20000 0x600" "$TEST_IMG" | _filter_qemu_io
76	do_test $align "$write_zero_cmd 0x400 0x20000" "$TEST_IMG" | _filter_qemu_io
77
78	echo
79	echo "== verifying patterns (1) =="
80	do_test $align "read -P 0xa 0x200 0x200" "$TEST_IMG" | _filter_qemu_io
81	do_test $align "read -P 0x0 0x400 0x20000" "$TEST_IMG" | _filter_qemu_io
82	do_test $align "read -P 0xa 0x20400 0x200" "$TEST_IMG" | _filter_qemu_io
83
84	echo
85	echo "== rewriting zeroes =="
86	do_test $align "write -P 0xb 0x10000 0x10000" "$TEST_IMG" | _filter_qemu_io
87	do_test $align "$write_zero_cmd 0x10000 0x10000" "$TEST_IMG" | _filter_qemu_io
88
89	echo
90	echo "== verifying patterns (2) =="
91	do_test $align "read -P 0x0 0x400 0x20000" "$TEST_IMG" | _filter_qemu_io
92
93	echo
94	echo "== rewriting unaligned zeroes =="
95	do_test $align "write -P 0xb 0x0 0x1000" "$TEST_IMG" | _filter_qemu_io
96	do_test $align "$write_zero_cmd 0x200 0x200" "$TEST_IMG" | _filter_qemu_io
97
98	echo
99	echo "== verifying patterns (3) =="
100	do_test $align "read -P 0xb 0x0 0x200" "$TEST_IMG" | _filter_qemu_io
101	do_test $align "read -P 0x0 0x200 0x200" "$TEST_IMG" | _filter_qemu_io
102	do_test $align "read -P 0xb 0x400 0xc00" "$TEST_IMG" | _filter_qemu_io
103
104	echo
105done
106done
107
108_cleanup_test_img
109
110# Trigger truncate that would shrink qcow2 L1 table, which is done by
111#   clearing one entry (8 bytes) with bdrv_co_pwrite_zeroes()
112
113echo
114echo "=== Test misaligned write zeroes via truncate ==="
115echo
116
117# any size will do, but the smaller the size the smaller the required image
118CLUSTER_SIZE=$((4 * 1024))
119L2_COVERAGE=$(($CLUSTER_SIZE * $CLUSTER_SIZE / 8))
120_make_test_img $(($L2_COVERAGE * 2))
121
122do_test 512 "write -P 1 0 0x200" "$TEST_IMG" | _filter_qemu_io
123# next L2 table
124do_test 512 "write -P 1 $L2_COVERAGE 0x200" "$TEST_IMG" | _filter_qemu_io
125
126# only interested in qcow2 here; also other formats might respond with
127#  "not supported" error message
128if [ $IMGFMT = "qcow2" ]; then
129    do_test 512 "truncate $L2_COVERAGE" "$TEST_IMG" | _filter_qemu_io
130fi
131
132do_test 512 "read -P 1 0 0x200" "$TEST_IMG" | _filter_qemu_io
133
134# success, all done
135echo
136echo "*** done"
137rm -f $seq.full
138status=0
139