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#! /bin/bash
# SPDX-License-Identifier: GPL-2.0
# Copyright (c) 2016 Facebook. All Rights Reserved.
#
# FS QA Test 391
#
# Test two threads doing non-overlapping direct I/O in the same extents.
# Motivated by a bug in Btrfs' direct I/O get_block function which would lead
# to spurious -EEXIST failures from direct I/O reads.
#
. ./common/preamble
_begin_fstest auto quick rw prealloc
# Override the default cleanup function.
_cleanup()
{
cd /
rm -f $tmp.*
rm -f "$testfile"
}
# Import common functions.
. ./common/filter
# real QA test starts here
_supported_fs generic
_require_test
_require_xfs_io_command "falloc"
_require_test_program "dio-interleaved"
_require_odirect
extent_size="$(($(_get_block_size "$TEST_DIR") * 2))"
num_extents=1024
testfile="$TEST_DIR/$$-testfile"
$XFS_IO_PROG -fc "truncate 0" "$testfile"
for ((off = 0; off < num_extents * extent_size; off += extent_size)); do
$XFS_IO_PROG -c "falloc $off $extent_size" "$testfile"
done
# To reproduce the Btrfs bug, the extent map must not be cached in memory.
sync
echo 3 > /proc/sys/vm/drop_caches
"$here/src/dio-interleaved" "$extent_size" "$num_extents" "$testfile"
echo "Silence is golden"
# success, all done
status=0
exit
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