#! /bin/bash
# SPDX-License-Identifier: GPL-2.0
# Copyright (c) 2016, Oracle and/or its affiliates.  All Rights Reserved.
#
# FS QA Test No. 328
#
# See how well xfs_fsr handles "defragging" a file with a hojillion extents.
#
seq=`basename "$0"`
seqres="$RESULT_DIR/$seq"
echo "QA output created by $seq"

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

_cleanup()
{
	cd /
	rm -rf "$tmp".*
}

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

# real QA test starts here
_supported_fs xfs
_require_scratch_reflink
_require_cp_reflink
_require_test_program "punch-alternating"
_require_xfs_io_command "falloc" # used in FSR
_require_command "$XFS_FSR_PROG" "xfs_fsr"

rm -f "$seqres.full"

echo "Format and mount"
_scratch_mkfs > "$seqres.full" 2>&1
_scratch_mount >> "$seqres.full" 2>&1

testdir="$SCRATCH_MNT/test-$seq"
mkdir "$testdir"

# Setup for 16000 blocks, but we'll accept stress testing down to
# 2^10 blocks... that should be plenty for anyone.
fnr=$((12 + LOAD_FACTOR))
free_blocks=$(stat -f -c '%a' "$testdir")
blksz=$(_get_file_block_size $testdir)
space_avail=$((free_blocks * blksz))
calc_space()
{
	blocks_needed=$(( 2 ** (fnr + 1) ))
	space_needed=$((blocks_needed * blksz * 5 / 4))
}
calc_space
while test $space_needed -gt $space_avail; do
	fnr=$((fnr - 1))
	calc_space
done
test $fnr -lt 10 && _notrun "Insufficient space for stress test; would only create $blocks_needed extents."
bytes=$((blocks_needed * blksz))

echo "Create a many-block file"
echo "creating $blocks_needed blocks..." >> "$seqres.full"
_pwrite_byte 0x62 0 $blksz $testdir/file0 >> $seqres.full
$XFS_IO_PROG -f -c "pwrite -S 0x61 -b 4194304 0 $bytes" "$testdir/file1" >> "$seqres.full"
echo "punching..." >> "$seqres.full"
"$here/src/punch-alternating" "$testdir/file1" >> "$seqres.full"
seq 0 2 $((2 ** (fnr + 1) )) | while read lblk; do
	_reflink_range $testdir/file0 0 $testdir/file1 $((lblk * blksz)) $blksz >> $seqres.full
done
echo "...done" >> "$seqres.full"
_scratch_cycle_mount

echo "Reflink the big file"
echo "reflinking $((blocks_needed / 2)) blocks, $((bytes / 2)) bytes" >> "$seqres.full"
_reflink_range "$testdir/file1" 0 "$testdir/file2" 0 $bytes >> "$seqres.full"

echo "Defrag the big file"
old_nextents=$(_count_extents $testdir/file1)
$XFS_FSR_PROG -v -d $testdir/file1 >> $seqres.full
new_nextents=$(_count_extents $testdir/file1)

echo "Check extent count"
$XFS_IO_PROG -c 'stat -v' $testdir/file1 >> $seqres.full
$XFS_IO_PROG -c 'stat -v' $testdir/file2 >> $seqres.full
echo "extents: $old_nextents -> $new_nextents" >> $seqres.full
test $old_nextents -gt $new_nextents || echo "FAIL: $old_nextents -> $new_nextents"

# success, all done
status=0
exit