#! /bin/bash
# FS QA Test No. generic/064
#
# Test multiple fallocate insert/collapse range calls on same file.
# Call insert range on alternate blocks multiple times until the file
# is left with 50 extents and as many holes. Then call collapse range
# on the previously inserted ranges to test merge code of collapse
# range. Also check for data integrity and file system consistency.
#-----------------------------------------------------------------------
# Copyright (c) 2015 Samsung Electronics.  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
#
#-----------------------------------------------------------------------
#

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

here=`pwd`
tmp=/tmp/$$
status=1	# failure is the default!
trap "rm -f $tmp.*; exit \$status" 0 1 2 3 15

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

# real QA test starts here
_supported_fs generic
_supported_os Linux

_require_scratch
_require_xfs_io_command "fiemap"
_require_xfs_io_command "finsert"
_require_xfs_io_command "fcollapse"
src=$SCRATCH_MNT/testfile
dest=$SCRATCH_MNT/testfile.dest
BLOCKS=100
BSIZE=`get_block_size $SCRATCH_MNT`
rm -f $seqres.full

_scratch_mkfs >> $seqres.full 2>&1 || _fail "mkfs failed"
_scratch_mount || _fail "mount failed"
length=$(($BLOCKS * $BSIZE))

# Write file
_do "$XFS_IO_PROG -f -c \"pwrite 0 $length\" -c fsync $src"
cp $src $dest
extent_before=`_count_extents $dest`

# Insert alternate blocks
for (( j=0; j < $(($BLOCKS/2)); j++ )); do
	offset=$((($j*$BSIZE)*2))
	_do "$XFS_IO_PROG -c \"finsert $offset $BSIZE\" $dest"
done

# Check if 50 extents are present, allowing some slop for file systems
# that don't have ideal allocation behavior
num_extents=`_count_extents $dest`
_within_tolerance "Extent count after inserts" $num_extents 50 0 6% -v

_check_scratch_fs
if [ $? -ne 0 ]; then
	status=1
	exit
fi

# Collapse alternate blocks
for (( j=0; j < $(($BLOCKS/2)); j++ )); do
	offset=$((($j*$BSIZE)))
	_do "$XFS_IO_PROG -c \"fcollapse $offset $BSIZE\" $dest"
done

extent_after=`_count_extents $dest`
if [ $extent_before -ne $extent_after ]; then
	echo "extents mismatched before = $extent_before after = $extent_after"
fi

# compare original file and test file.
cmp $src $dest || _fail "file bytes check failed"

# success, all done
status=0
exit
