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#! /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
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