1#!/bin/bash
2#
3# Test lseek influence on qcow2 block-status
4#
5# Block layer may recursively check block_status in file child of qcow2, if
6# qcow2 driver returned DATA. There are several test cases to check influence
7# of lseek on block_status performance. To see real difference run on tmpfs.
8#
9# Copyright (c) 2019 Virtuozzo International GmbH. All rights reserved.
10#
11# Tests originally written by Kevin Wolf
12#
13# This program is free software; you can redistribute it and/or modify
14# it under the terms of the GNU General Public License as published by
15# the Free Software Foundation; either version 2 of the License, or
16# (at your option) any later version.
17#
18# This program is distributed in the hope that it will be useful,
19# but WITHOUT ANY WARRANTY; without even the implied warranty of
20# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
21# GNU General Public License for more details.
22#
23# You should have received a copy of the GNU General Public License
24# along with this program.  If not, see <http://www.gnu.org/licenses/>.
25#
26
27if [ "$#" -lt 1 ]; then
28    echo "Usage: $0 SOURCE_FILE"
29    exit 1
30fi
31
32ROOT_DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )/../../../.." >/dev/null 2>&1 && pwd )"
33QEMU_IMG="$ROOT_DIR/qemu-img"
34QEMU_IO="$ROOT_DIR/qemu-io"
35
36size=1G
37src="$1"
38
39# test-case plain
40
41(
42$QEMU_IMG create -f qcow2 "$src" $size
43for i in $(seq 16384 -1 0); do
44    echo "write $((i * 65536)) 64k"
45done | $QEMU_IO "$src"
46) > /dev/null
47
48echo -n "plain: "
49/usr/bin/time -f %e $QEMU_IMG convert -n "$src" null-co://
50
51# test-case forward
52
53(
54$QEMU_IMG create -f qcow2 "$src" $size
55for i in $(seq 0 2 16384); do
56    echo "write $((i * 65536)) 64k"
57done | $QEMU_IO "$src"
58for i in $(seq 1 2 16384); do
59    echo "write $((i * 65536)) 64k"
60done | $QEMU_IO "$src"
61) > /dev/null
62
63echo -n "forward: "
64/usr/bin/time -f %e $QEMU_IMG convert -n "$src" null-co://
65
66# test-case prealloc
67
68$QEMU_IMG create -f qcow2 -o preallocation=metadata "$src" $size > /dev/null
69
70echo -n "prealloc: "
71/usr/bin/time -f %e $QEMU_IMG convert -n "$src" null-co://
72