#! /bin/bash
# SPDX-License-Identifier: GPL-2.0
# Copyright (c) 2024 Meta Platforms, Inc.  All Rights Reserved.
#
# FS QA Test No. 742
#
# Test fiemap into an mmaped buffer of the same file
#
# Create a reasonably large file, then run a program which mmaps it and uses
# that as a buffer for an fiemap call.  This is a regression test for btrfs
# where we used to hold a lock for the duration of the fiemap call which would
# result in a deadlock if we page faulted.
#
. ./common/preamble
_begin_fstest quick auto fiemap
[ $FSTYP == "btrfs" ] && \
	_fixed_by_kernel_commit b0ad381fa769 \
		"btrfs: fix deadlock with fiemap and extent locking"

_cleanup()
{
	rm -f $dst
	cd /
	rm -r -f $tmp.*
}

# real QA test starts here
_supported_fs generic
_require_test
_require_test_program "fiemap-fault"
_require_test_program "punch-alternating"
_require_xfs_io_command "fpunch"
_require_xfs_io_command "fiemap"

dst=$TEST_DIR/$seq/fiemap-fault

mkdir -p $TEST_DIR/$seq

echo "Silence is golden"

# Generate a file with lots of extents
blksz=$(_get_file_block_size $TEST_DIR)
$XFS_IO_PROG -f -c "pwrite -q 0 $((blksz * 10000))" $dst
$here/src/punch-alternating $dst

# Now run the reproducer
$here/src/fiemap-fault $dst

# success, all done
status=$?
exit