#! /bin/bash
# SPDX-License-Identifier: GPL-2.0
# Copyright (c) 2000-2002 Silicon Graphics, Inc.  All Rights Reserved.
#
# FS QA Test No. 042
#
# xfs_fsr QA tests
# create a large fragmented file and check that xfs_fsr doesn't corrupt
# it or the other contents of the filesystem
#
set +x

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

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

_cleanup()
{
    _scratch_unmount
    rm -f $tmp.*
}
trap "_cleanup ; exit \$status" 0 1 2 3 15

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

# real QA test starts here
_supported_fs xfs

_require_scratch

[ "$XFS_FSR_PROG" = "" ] && _notrun "xfs_fsr not found"

# Test performs several operations to produce a badly fragmented file, then
# create enough contiguous free space for xfs_fsr to defragment the fragmented
# file:
#
# - create fs with 3 minimum sized (16Mb) allocation groups
# - create 16x1MB contiguous files which will become large free space extents
#   when deleted
# - put a small "space" between each of the 16 contiuguous files to ensure we
#   have separated free space extents
# - fill the remaining free space with a "fill file"
# - mount/unmount/fill remaining free space with a pad file
# - punch alternate single block holes in the the "fill file" to create
#   fragmented free space.
# - use fill2 to generate a very large fragmented file
# - delete the 16 large contiguous files created initially
# - run xfs_fsr on the filesystem
# - check checksums for remaining files

rm -f $seqres.full
_do_die_on_error=message_only

echo -n "Make a 48 megabyte filesystem on SCRATCH_DEV and mount... "
_scratch_mkfs_xfs -dsize=48m,agcount=3 2>&1 >/dev/null || _fail "mkfs failed"
_scratch_mount

echo "done"

echo -n "Reserve 16 1Mb unfragmented regions... "
for i in 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
do
	_do "$XFS_IO_PROG -f -c \"resvsp 0 1m\" $SCRATCH_MNT/hole$i"
	_do "$XFS_IO_PROG -f -c \"resvsp 0 4k\" $SCRATCH_MNT/space$i"
	_do "xfs_bmap -vp $SCRATCH_MNT/hole$i"
done
echo "done" 

# set up filesystem
echo -n "Fill filesystem with fill file... "
for i in `seq 0 1 31`; do
	_do "$XFS_IO_PROG -f -c \"falloc ${i}m 1m\" $SCRATCH_MNT/fill"
done
_do "xfs_bmap -vp $SCRATCH_MNT/fill"
echo "done"
# flush the filesystem - make sure there is no space "lost" to pre-allocation
_do "_scratch_unmount"
_do "_try_scratch_mount"
echo -n "Use up any further available space... "
_do "$XFS_IO_PROG -f -c \"falloc 0 1m\" $SCRATCH_MNT/pad"
echo "done"

# create fragmented file
#_do "Delete every second file" "_cull_files"
echo -n "Punch every second 4k block... "
for i in `seq 0 8 32768`; do
	# This generates excessive output that significantly slows down the
	# test. It's not necessary for debug, so just bin it.
	$XFS_IO_PROG -f -c "unresvsp ${i}k 4k" $SCRATCH_MNT/fill \
								> /dev/null 2>&1
done
_do "xfs_bmap -vp $SCRATCH_MNT/fill"
_do "sum $SCRATCH_MNT/fill >$tmp.fillsum1"
echo "done"

echo -n "Create one very large file... "
_do "$here/src/fill2 -d nbytes=16000000,file=$SCRATCH_MNT/fragmented"
echo "done"
_do "xfs_bmap -v $SCRATCH_MNT/fragmented"
_do "sum $SCRATCH_MNT/fragmented >$tmp.sum1"
_do "Remove other files" "rm -rf $SCRATCH_MNT/{pad,hole*}"

# defragment
_do "Run xfs_fsr on filesystem" "$XFS_FSR_PROG -v $SCRATCH_MNT/fragmented"
_do "xfs_bmap -v $SCRATCH_MNT/fragmented"

echo -n "Check fill file... "
_do "sum $SCRATCH_MNT/fill >$tmp.fillsum2"
if ! _do "diff $tmp.fillsum1 $tmp.fillsum2"; then
    echo "fail"
    echo "Fill file is corrupt/missing after fsr. Test failed see $seqres.full"
    status=1; exit
fi
echo "done"

# check
echo -n "Check large file... "
_do "sum $SCRATCH_MNT/fragmented >$tmp.sum2"
if ! _do "diff $tmp.sum1 $tmp.sum2"; then
    echo "fail"
    echo "File is corrupt/missing after fsr. Test failed see $seqres.full"
    status=1; exit
fi
echo "done"

# success, all done
echo "xfs_fsr tests passed."
status=0 ; exit