#! /bin/bash
# SPDX-License-Identifier: GPL-2.0
#
# FS QA Test 738
#
# Test possible deadlock of umount and reclaim memory
# when there are EOF blocks in files.
#
. ./common/preamble
_begin_fstest auto quick freeze

_cleanup()
{
	xfs_freeze -u $SCRATCH_MNT 2>/dev/null
	wait
	cd /
	rm -r -f $tmp.*
}

_supported_fs generic
_require_scratch
_require_freeze

_scratch_mkfs >> $seqres.full
_scratch_mount

create_eof_block_file()
{
	# Create several EOF blocks in the new file
	for j in $(seq 1 5); do
		cat $SCRATCH_MNT/testfile >> $1
	done
}

$XFS_IO_PROG -fc "pwrite 0 64k" $SCRATCH_MNT/testfile >> $seqres.full
# Create enough files to make sure there is enough cache
for i in $(seq 0 1024); do
	create_eof_block_file $SCRATCH_MNT/$i
done
sync
xfs_freeze -f $SCRATCH_MNT

# This will hang if bug reproduces
echo 3 > /proc/sys/vm/drop_caches &

# Wait a while before exiting and unfreezing.
sleep 3

# success, all done
echo "Silence is golden"
status=0
exit