apfstests/203

#! /bin/bash
# FS QA Test No. 203
#
# Test out reallocation of the extent array in xfs_io.
# Based on a testcase from Tomasz Majkowski <moosh009@gmail.com>.
#
#-----------------------------------------------------------------------
# Copyright (c) 2009 Christoph Hellwig.
#
# 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.
#
# This program is distributed in the hope that it would 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, write the Free Software Foundation,
# Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
#-----------------------------------------------------------------------
#
# creator
owner=hch@lst.de

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

here=`pwd`
tmp=/tmp/$$
status=1	# failure is the default!

_write_holes()
{
	file=$1
	holes=$2
	let writes=$holes+1
	let fsize=$(($writes * 0x100000))

	# prevent EOF preallocation from affecting results
	xfs_io -f $file -c "truncate $fsize"

	offset=0
	for i in `seq 0 $writes`; do
		xfs_io -f $file -c "pwrite -q $offset 64k"
		let offset=$offset+0x100000
	done
}

#       0: [0..7]: 104..111
#       1: [8..2047]: hole
_filter_bmap()
{
	_filter_scratch |
	awk '$3 ~ /hole/ { print $1, $2, $3; next }
             {print $1, $2; next}'
}

_cleanup()
{
	rm -f $SCRATCH_MNT/r??
}
trap "_cleanup; exit \$status" 0 1 2 3 15

rm -f $seq.full

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

# real QA test starts here
_supported_fs xfs
_supported_os Linux
_require_scratch
_scratch_mkfs > /dev/null 2>&1
_scratch_mount > /dev/null 2>&1

for i in 10 14 15 16 17 28 29 30 31; do
        rm -f $SCRATCH_MNT/hole_file
	_write_holes $SCRATCH_MNT/hole_file${i} ${i}
done

for i in 10 14 15 16 17 28 29 30 31; do
        xfs_bmap $SCRATCH_MNT/hole_file${i} | _filter_bmap
	echo
done

# success, all done
echo "*** done"
status=0