| #! /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. |
| # |
| seq=`basename $0` |
| seqres=$RESULT_DIR/$seq |
| echo "QA output created by $seq" |
| |
| here=`pwd` |
| tmp=/tmp/$$ |
| status=1 # failure is the default! |
| trap "_cleanup; exit \$status" 0 1 2 3 15 |
| |
| _cleanup() |
| { |
| cd / |
| rm -f $tmp.* |
| rm -f "$testfile" |
| } |
| |
| # get standard environment, filters and checks |
| . ./common/rc |
| . ./common/filter |
| |
| # remove previous $seqres.full before test |
| rm -f $seqres.full |
| |
| # real QA test starts here |
| |
| _supported_fs generic |
| _require_test |
| _require_xfs_io_command "falloc" |
| _require_test_program "dio-interleaved" |
| _require_odirect |
| |
| extent_size="$(($(_get_block_size "$TEST_DIR") * 2))" |
| num_extents=1024 |
| testfile="$TEST_DIR/$$-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 |