#! /bin/bash
# SPDX-License-Identifier: GPL-2.0
# Copyright (c) 2016 Fujitsu.  All Rights Reserved.
#
# FS QA Test 021
#
# Regression test for commit:
# 688f869 ext4: Initialize fsync transaction ids in ext4_new_inode()
#
. ./common/preamble
_begin_fstest auto quick

# Import common functions.

# real QA test starts here
_supported_fs ext4
_require_scratch
_require_dumpe2fs

_scratch_mkfs >> $seqres.full 2>&1
_scratch_mount
blocksize=$(_get_block_size $SCRATCH_MNT)
_scratch_unmount

# With 4k block size, this amounts to 10M FS instance.
fssize=$((2560 * $blocksize))
_scratch_mkfs_sized $fssize >> $seqres.full 2>&1
_require_metadata_journaling $SCRATCH_DEV

offset=0
found=0
# this is the jbd2 journal superblock magic number on disk, in big endian
magic="c0 3b 39 98"

while [ $offset -lt $fssize ]; do
	if od -j $offset -N 4 -t x1 $SCRATCH_DEV | \
	   grep -i "$magic" >/dev/null; then
		echo "Found journal: $offset" >> $seqres.full
		found=1
		break
	fi
	offset=$((offset + blocksize))
done
if [ $found -ne 1 ]; then
	echo "Found no journal"
	exit
fi

# Overwrite journal.s_squence to 0x 81d1a480
# 0x81d1a480 is hex form of 2178000000, and jbd2 journal is big endian on
# disk, the s_squence offset to the beginning of journal superblock is 24
# we do this to let jbd2 start to run with a initial big transaction id,
# which will reduce the time taken to trigger this bug.
$XFS_IO_PROG -c "pwrite -S 0x81 $((offset+24)) 1" \
	-c "pwrite -S 0xd1 $((offset+25)) 1" \
	-c "pwrite -S 0xa4 $((offset+26)) 1" \
	-c "pwrite -S 0x80 $((offset+27)) 1" $SCRATCH_DEV >> $seqres.full 2>&1

trans_id=`$DUMPE2FS_PROG $SCRATCH_DEV 2>/dev/null | grep "Journal sequence" | \
	awk '{print $NF}'`
echo "Initial transaction id is $trans_id"
_scratch_mount

do_fdatasync_work()
{
	# Wait for running subcommand before exitting so that
	# mountpoint is not busy when we try to unmount it
	trap "wait; exit" SIGTERM

	while [ 1 ]; do
		$XFS_IO_PROG -f -c "fdatasync" $SCRATCH_MNT/testfile
	done
}

do_fdatasync_work &
datasync_work_pid=$!
sleep 10
kill $datasync_work_pid >/dev/null 2>&1
wait

# success, all done
status=0
exit