qemu/tests/qemu-iotests/221

#!/usr/bin/env bash
# group: rw quick
#
# Test qemu-img vs. unaligned images
# (See also 253, which is the O_DIRECT version)
#
# Copyright (C) 2018-2019 Red Hat, Inc.
#
# 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/>.
#

seq="$(basename $0)"
echo "QA output created by $seq"

status=1 # failure is the default!

_cleanup()
{
    _cleanup_test_img
}
trap "_cleanup; exit \$status" 0 1 2 3 15

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

_supported_fmt raw
_supported_proto file fuse
_supported_os Linux

_default_cache_mode writeback
_supported_cache_modes writeback writethrough unsafe

echo
echo "=== Check mapping of unaligned raw image ==="
echo

_make_test_img 65537 # qemu-img create rounds size up

# file-posix allocates the first block of any images when it is created;
# the size of this block depends on the host page size and the file
# system block size, none of which are constant.  Discard the whole
# image so we will not see this allocation in qemu-img map's output.
$QEMU_IO -c 'discard 0 65537' "$TEST_IMG" | _filter_qemu_io

$QEMU_IMG map --output=json "$TEST_IMG" | _filter_qemu_img_map

truncate --size=65537 "$TEST_IMG" # so we resize it and check again
$QEMU_IMG map --output=json "$TEST_IMG" | _filter_qemu_img_map

$QEMU_IO -c 'w 65536 1' "$TEST_IMG" | _filter_qemu_io # writing also rounds up
$QEMU_IMG map --output=json "$TEST_IMG" | _filter_qemu_img_map

truncate --size=65537 "$TEST_IMG" # so we resize it and check again
$QEMU_IMG map --output=json "$TEST_IMG" | _filter_qemu_img_map

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