mirror of
https://github.com/linux-apfs/apfstests.git
synced 2026-05-01 15:01:44 -07:00
Omar Sandoval
21616145d2
There have been a couple of logic bugs in `btrfs_get_extent()` which
could lead to spurious -EEXIST errors from read or write. This test
exercises those conditions by having two threads race to add an
extent to the extent map.
This is fixed by Linux commit 8dff9c853410 ("Btrfs: deal with
duplciates during extent_map insertion in btrfs_get_extent") and the
patch "Btrfs: deal with existing encompassing extent map in
btrfs_get_extent()"
(http://marc.info/?l=linux-btrfs&m=147873402311143&w=2).
Although the bug is Btrfs-specific, nothing about the test is.
Signed-off-by: Omar Sandoval <osandov@fb.com>
Reviewed-by: Eryu Guan <eguan@redhat.com>
Signed-off-by: Eryu Guan <eguan@redhat.com>
77 lines
2.1 KiB
Bash
Executable File
77 lines
2.1 KiB
Bash
Executable File
#! /bin/bash
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# FS QA Test 391
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#
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# Test two threads doing non-overlapping direct I/O in the same extents.
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# Motivated by a bug in Btrfs' direct I/O get_block function which would lead
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# to spurious -EEXIST failures from direct I/O reads.
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#
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#-----------------------------------------------------------------------
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# Copyright (c) 2016 Facebook. All Rights Reserved.
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#
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# This program is free software; you can redistribute it and/or
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# modify it under the terms of the GNU General Public License as
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# published by the Free Software Foundation.
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#
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# This program is distributed in the hope that it would be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write the Free Software Foundation,
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# Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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#-----------------------------------------------------------------------
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#
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seq=`basename $0`
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seqres=$RESULT_DIR/$seq
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echo "QA output created by $seq"
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here=`pwd`
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tmp=/tmp/$$
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status=1 # failure is the default!
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trap "_cleanup; exit \$status" 0 1 2 3 15
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_cleanup()
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{
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cd /
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rm -f $tmp.*
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rm -f "$testfile"
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}
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# get standard environment, filters and checks
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. ./common/rc
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. ./common/filter
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# remove previous $seqres.full before test
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rm -f $seqres.full
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# real QA test starts here
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_supported_fs generic
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_supported_os Linux
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_require_test
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_require_xfs_io_command "falloc"
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_require_test_program "dio-interleaved"
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extent_size="$(($(get_block_size "$TEST_DIR") * 2))"
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num_extents=1024
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testfile="$TEST_DIR/$$-testfile"
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$XFS_IO_PROG -fc "truncate 0" "$testfile"
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for ((off = 0; off < num_extents * extent_size; off += extent_size)); do
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$XFS_IO_PROG -c "falloc $off $extent_size" "$testfile"
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done
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# To reproduce the Btrfs bug, the extent map must not be cached in memory.
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sync
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echo 3 > /proc/sys/vm/drop_caches
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"$here/src/dio-interleaved" "$extent_size" "$num_extents" "$testfile"
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echo "Silence is golden"
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# success, all done
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status=0
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exit
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