common/defrag

##/bin/bash
#
# Copyright (c) 2009 Eric Sandeen
# All Rights Reserved.
#
# 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
#
#
# Functions useful for defragmentation tests
#

_require_defrag()
{
    case "$FSTYP" in
    xfs)
        DEFRAG_PROG="$XFS_FSR_PROG"
	;;
    ext4|ext4dev)
	testfile="$TEST_DIR/$$-test.defrag"
	donorfile="$TEST_DIR/$$-donor.defrag"
	bsize=`_get_block_size $TEST_DIR`
	$XFS_IO_PROG -f -c "pwrite -b $bsize 0 $bsize" $testfile > /dev/null
	cp $testfile $donorfile
	echo $testfile | $here/src/e4compact -v -f $donorfile | \
		grep -q "err:95"
	if [ $? -eq 0 ]; then
		rm -f $testfile $donorfile 2>&1 > /dev/null
		_notrun "$FSTYP test filesystem doesn't support online defrag"
	fi
	rm -f $testfile $donorfile 2>&1 > /dev/null
	DEFRAG_PROG="$E4DEFRAG_PROG"
	;;
    btrfs)
	DEFRAG_PROG="$BTRFS_UTIL_PROG filesystem defragment"
	;;
    *)
        _notrun "defragmentation not supported for fstype \"$FSTYP\""
	;;
    esac

    _require_command "$DEFRAG_PROG" defragment
    _require_xfs_io_command "fiemap"
}

_extent_count()
{
	$XFS_IO_PROG -c "fiemap" $1  >> $seqres.full 2>&1
	$XFS_IO_PROG -c "fiemap" $1 | tail -n +2 | grep -v hole | wc -l| $AWK_PROG '{print $1}'
}

_check_extent_count()
{
	min=$1
	max=$2
	ext_cnt=$3

	# Return failure if $3 isn't between $1 and $2; let caller decide
	# action if it's not, we just return status here.
	if [ "$min" -gt "$ext_cnt" ]; then
		echo "Found $ext_cnt extents  min:$max"
		return 1;
	fi
	if [ "$max" -ne -1 ] && [ "$ext_cnt" -gt "$max" ]; then
		echo "Found $ext_cnt max: $max"
		return 1;
	fi

	if [ $max -ne $min ]; then
	    echo "in_range($min, $max)"
	else
	    echo "$ext_cnt"
	fi
	# success
	return 0
}

# Defrag file, check it, and remove it.
_defrag()
{
	min_before=0
	max_before=-1
	min_after=0
	max_after=-1
	csum=1
	mtime=1

	while [ $# -gt 1 ]
	do
            case $1
		in
		--min_before)
		    [ -z "$2" ] && _fail "missing argument for --min_before"
		    min_before=$2
		    shift
		    ;;
		--max_before)
		    [ -z "$2" ] && _fail "missing argument for --max_before"
		    max_before=$2
		    shift
		    ;;
		--min_after)
		    [ -z "$2" ] && _fail "missing argument for --min_after"
		    min_after=$2
		    shift
		    ;;
		--max_after)
		    [ -z "$2" ] && _fail "missing argument for --max_after"
		    max_after=$2
		    shift
		    ;;
		--before)
		    [ -z "$2" ] && _fail "missing argument for --before"
		    min_before=$2
		    max_before=$2
		    shift
		    ;;
		--after)
		    [ -z "$2" ] && _fail "missing argument for --after"
		    min_after=$2
		    max_after=$2
		    shift
		    ;;
		--no_csum)
		    csum=
		    ;;
		--no_mtime)
		    mtime=
		    ;;
		--no_unlink)
		    no_unlink=1
		    ;;
		*)
		    _fail "invalid argument to common/dump function: $1"
		    ;;
            esac
	    shift
	done

	echo -n "Before: "
	ext_before=$(_extent_count $1)
	_check_extent_count $min_before $max_before $ext_before
	[ $? -eq 0 ] || _notrun "Could not adequately fragment file"

	[ ! -z $csum ] && CSUM_BEFORE=`md5sum $1`
	STAT_BEFORE=`stat -c "a: %x m: %y c: %z" $1`
	$DEFRAG_PROG -v $1 >> $seqres.full 2>&1

	_scratch_cycle_mount
	STAT_AFTER=`stat -c "a: %x m: %y c: %z" $1`
	[ ! -z $csum ] && CSUM_AFTER=`md5sum $1`

	echo -n "After: "
	ext_after=$(_extent_count $1)
	_check_extent_count $min_after $max_after $ext_after
	[ $? -eq 0 ] || _fail "Failed to adequately defragment file"

	[ "$ext_before" -lt "$ext_after" ] && \
		_fail "Number of extents increased after defragmentation," \
		      " before:$ext_before, after:$ext_after"
	if [ ! -z $csum ] && [ "$CSUM_BEFORE" != "$CSUM_AFTER" ]; then
		_fail "file checksum changed post-defrag ($CSUM_BEFORE/$CSUM_AFTER)"
	fi
	if [ ! -z $mtime ] && [ "$STAT_BEFORE" != "$STAT_AFTER" ]; then
		_fail "file timestamps changed post-defrag:\n$STAT_BEFORE\n$STAT_AFTER"
	fi
	[ -z $no_unlink ] && rm -f $1
}