qemu/tests/qemu-iotests/175

#!/usr/bin/env bash
#
# Test creating raw image preallocation mode
#
# Copyright (C) 2017 Nir Soffer <nirsof@gmail.com>
#
# 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=nirsof@gmail.com

seq=`basename $0`
echo "QA output created by $seq"

status=1	# failure is the default!

_cleanup()
{
    _cleanup_test_img
    rm -f "$TEST_DIR/empty"
}
trap "_cleanup; exit \$status" 0 1 2 3 15

# Some file systems sometimes allocate extra blocks independently of
# the file size.  This function hides the resulting difference in the
# stat -c '%b' output.
# Parameter 1: Number of blocks an empty file occupies
# Parameter 2: Image size in bytes
_filter_blocks()
{
    extra_blocks=$1
    img_size=$2

    sed -e "s/blocks=$extra_blocks\\(\$\\|[^0-9]\\)/nothing allocated/" \
        -e "s/blocks=$((extra_blocks + img_size / 512))\\(\$\\|[^0-9]\\)/everything allocated/"
}

# get standard environment, filters and checks
. ./common.rc
. ./common.filter

_supported_fmt raw
_supported_proto file
_supported_os Linux

size=$((1 * 1024 * 1024))

touch "$TEST_DIR/empty"
extra_blocks=$(stat -c '%b' "$TEST_DIR/empty")

echo
echo "== creating image with default preallocation =="
_make_test_img $size | _filter_imgfmt
stat -c "size=%s, blocks=%b" $TEST_IMG | _filter_blocks $extra_blocks $size

for mode in off full falloc; do
    echo
    echo "== creating image with preallocation $mode =="
    IMGOPTS=preallocation=$mode _make_test_img $size | _filter_imgfmt
    stat -c "size=%s, blocks=%b" $TEST_IMG | _filter_blocks $extra_blocks $size
done

# success, all done
echo "*** done"
rm -f $seq.full
status=0