#! /bin/bash
# SPDX-License-Identifier: GPL-2.0
# Copyright (c) 2016 Red Hat, inc.  All Rights Reserved.
#
# FS QA Test 118
#
# Test xfs_fsr's handling of 2-extent files with preallocation
#
# An error in xfs_swap_extent_forks() incorrectly set up the
# temporary inode's if_extents pointer to inline, leading to
# in-memory corruption when the temporary inode was released
# and torn down; i_itemp and d_ops got overwritten with zeros,
# which led to an oops in xfs_trans_log_inode down the fput path.
#
# Fixed upstream by proper nextents counting using
# ip->i_df.if_bytes not ip->i_d.di_nextents in xfs_swap_extent_forks
#
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 -f $tmp.*
}

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

# remove previous $seqres.full before test
rm -f $seqres.full

_supported_fs xfs

_require_scratch
_require_command "$XFS_FSR_PROG" "xfs_fsr"

# 50M
_scratch_mkfs_sized $((50 * 1024 * 1024)) >> $seqres.full 2>&1
_scratch_mount

echo "Silence is golden"

# Fragment freespace
# The aim is to create a fragmented two-extent file *with* prealloc
# so make the free holes big enough that a 2-extent file will have
# preallocation added.  Let's say... 64k free chunks.

$XFS_IO_PROG -fs -c "falloc 0 40000k" $SCRATCH_MNT/fill >> $seqres.full 2>&1
sync

dd if=/dev/zero of=$SCRATCH_MNT/remainder oflag=direct > /dev/null 2>&1

# Free up a bunch of 64k chunks
for i in `seq 0 68 40000`; do
	$XFS_IO_PROG -fs -c "unresvsp ${i}k 64k" $SCRATCH_MNT/fill
done

# Create 2-extent files w/ preallocation (via extending writes)
for I in `seq 1 64`; do
	$XFS_IO_PROG -f -c "pwrite 0 64k" $SCRATCH_MNT/newfile-$I \
						 >> $seqres.full 2>&1
	$XFS_IO_PROG -f -c "pwrite 64k 64k" $SCRATCH_MNT/newfile-$I \
						>> $seqres.full 2>&1
done
# sync to get extents on disk so fsr sees them
sync

# Free up some space for defragmentation temp file
rm -f $SCRATCH_MNT/fill

$XFS_FSR_PROG -vd $SCRATCH_MNT/newfile* >> $seqres.full 2>&1

# success, all done
status=0
exit