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use dd and lmdd for proper direct/buffered IO on linux and irix
Merge of master-melb:xfs-cmds:29214a by kenmcd.

##/bin/sh
#
# Copyright (c) 2007 Silicon Graphics, Inc.  All Rights Reserved.
#
# Core of filestreams tests.
#

_check_filestreams_support()
{
	local irix_timeout_sysvar="xfs_mfstream_timeout"
	local linux_timeout_procvar="/proc/sys/fs/xfs/filestream_centisecs"
	local streams_avail=""
	if [ "$HOSTOS" == "IRIX" ]; then
		# check for the filestreams timeout systune variable in irix
		streams_avail=`systune $irix_timeout_sysvar 2>&1 |
			perl -ne 'if (/'$irix_timeout_sysvar'\s+=\s+\d+/) {print "true"}'`
	else
		# check for the filestreams timeout proc entry in linux
		[ -f $linux_timeout_procvar ] && streams_avail="true"
	fi

	if [ "$streams_avail" == "true" ]; then
		return 0
	else
		return 1
	fi
}

_set_stream_timeout_centisecs()
{
	local new_timeout_csecs=$1
	local irix_timeout_sysvar="xfs_mfstream_timeout"
	local linux_timeout_procvar="/proc/sys/fs/xfs/filestream_centisecs"
	if [ "$HOSTOS" == "IRIX" ]; then
		echo y | systune -r $irix_timeout_sysvar $new_timeout_csecs >/dev/null
	else
		echo $new_timeout_csecs > $linux_timeout_procvar
	fi
}

_do_stream()
{
	local directory_name=$1
	local files=$2
	local file_size=$3
	local bsize=$4
	local iflag=$5
	local dio=$6
	local blocks_in_file=`expr $file_size / $bsize`

	mkdir $directory_name
	if [ "$iflag" = "1" -a "$HOSTOS" != "IRIX" ]; then
		$XFS_IO_PROG -x -c "chattr +S" $directory_name \
			|| _fail "chattr of filestream flag"
	fi
	cd $directory_name

	local dd_cmd=""
	if [ "$HOSTOS" == "IRIX" ]; then
		# for irix use lmdd
		dd_cmd="lmdd"
		[ "$dio" = "1" ] && dd_cmd="$dd_cmd odirect=1"
	else
		# for linux use dd
		dd_cmd="dd"
		[ "$dio" = "1" ] && dd_cmd="$dd_cmd oflag=direct"
	fi
	dd_cmd="$dd_cmd if=/dev/zero bs=${bsize} count=${blocks_in_file}"

	local i=1
	while [ $i -le $files ]; do
		$dd_cmd of=frame-${i} 2>&1 | grep -v records | grep -v secs
		i=`expr $i + 1`
	done
}

_filter_agno()
{
        # the ag number is in column 4 of xfs_bmap output
        perl -ne '
                $ag = (split /\s+/)[4] ;
		if ($ag =~ /\d+/) {print "$ag "} ;
        '
}

_get_stream_ags()
{
        local directory_name=$1
        local stream_ags=`xfs_bmap -vp ${directory_name}/* | _filter_agno`
        echo $stream_ags
}

_check_for_dupes()
{
        # check for duplicate numbers between two space seperated vars
        local num_str_one=$1
        local num_str_two=$2

        local this_num_one
        local this_num_two
        for this_num_one in $num_str_one; do
                for this_num_two in $num_str_two; do
                        if [ "$this_num_one" == "$this_num_two" ]; then
				echo "duplicate AG $this_num_one found" \
					>> $here/$seq.full
				return 1
			fi
                done
        done
        return 0
}

_test_streams() {

	echo "# testing $* ...."
	local agcount="$1"
	local agsize="$2" # in MB
	local stream_count="$3"
	local stream_files="$4"
	local stream_file_size=`expr $5 \* 1024 \* 1024`
	local use_iflag="$6"
	local use_directio="$7"
	local expected_result="$8"	# "fail" if failure is expected

	local size=`expr $agsize \* 1024 \* 1024 \* $agcount`
	_scratch_mkfs_xfs -dsize=$size,agcount=$agcount >/dev/null 2>&1 \
		|| _fail "mkfs failed"

	if [ "$use_iflag" = "0" -o "$HOSTOS" == "IRIX" ]; then
		# mount using filestreams mount option
		_scratch_mount "-o filestreams" \
			|| _fail "filestreams mount failed"
	else
		# test will set inode flag
		_scratch_mount || _fail "mount failed"
	fi

	cd $SCRATCH_MNT

	# start $stream_count streams
	# each stream writes ($stream_files x $stream_file_size)M
	echo "# streaming"
	local stream_pids=""
	local stream_index=1
	while [ $stream_index -le $stream_count ]; do
		_do_stream stream${stream_index}-dir $stream_files \
			$stream_file_size 1048576 $use_iflag $use_directio &
		stream_pids="$stream_pids $!"
		stream_index=`expr $stream_index + 1`
	done

	# wait for streams to finish
	# XXX wait here not needed? -dgc
	wait $stream_pids

	# sync the buffered streams out in parallel
	# _get_stream_ags does a xfs_bmap which syncs delayed allocations
	echo "# sync AGs..."
	local ag_sync_pids=""
	stream_index=1
	while [ $stream_index -le $stream_count ]; do
		_get_stream_ags stream${stream_index}-dir > /dev/null 2>&1 &
		ag_sync_pids="$ag_sync_pids $!"
		stream_index=`expr $stream_index + 1`
	done

	# wait for syncs to finish
	wait $ag_sync_pids

	# confirm streams are in seperate AGs
	echo "# checking stream AGs..."
	local this_stream_ags=""
	local ags_seen=""
	local num_streams_with_matching_ags=0
	stream_index=1
	while [ $stream_index -le $stream_count ]; do
		this_stream_ags=`_get_stream_ags stream${stream_index}-dir`
		echo "stream $stream_index AGs: $this_stream_ags" >> $here/$seq.full
		_check_for_dupes "$ags_seen" "$this_stream_ags"
		if [ $? -ne 0 ]; then
			# this stream is not in seperate AGs to previous streams
			num_streams_with_matching_ags=`expr $num_streams_with_matching_ags + 1`
		fi
		ags_seen="$ags_seen $this_stream_ags"
		stream_index=`expr $stream_index + 1`
	done

	_cleanup_streams_umount
	if [ "$expected_result" != "fail" ]; then
		if [ $num_streams_with_matching_ags -eq 0 ]; then
			# all streams in seperate AGs, as expected
			echo "+ passed, streams are in seperate AGs"
		else
			# streams with matching AGs, should be seperate
			_fail "- failed, $num_streams_with_matching_ags streams with matching AGs"
		fi
	else
		# expecting streams to have overlapped
		if [ $num_streams_with_matching_ags -eq 0 ]; then
			# all streams in seperate AGs, should have overlapped
			_fail "- streams are in seperate AGs, expected _matching_"
		else
			# streams with matching AGs, as expected
			echo "+ expected failure, matching AGs"
		fi
	fi
	return 0
}

_cleanup_streams_umount()
{
	cd /
	rm -rf ${SCRATCH_MNT}/stream*
	umount $SCRATCH_DEV 2>/dev/null
}