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https://github.com/linux-apfs/apfstests.git
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Ross Zwisler
d2f9bf265f
This adds a regression test for the following series: [PATCH v4 0/2] ext4: fix DAX dma vs truncate/hole-punch https://lists.01.org/pipermail/linux-nvdimm/2018-July/016842.html which adds synchronization between DAX DMA in ext4 and truncate/hole-punch. The intention of the test is to test those specific changes, but it runs fine both with XFS and without DAX so I've put it in the generic tests instead of ext4 and not restricted it to only DAX configurations. When run with v4.18-rc6 + DAX + ext4, this test will hit the following WARN_ON_ONCE() in dax_disassociate_entry(): WARN_ON_ONCE(trunc && page_ref_count(page) > 1); If you change this to a WARN_ON() instead, you can see that each of the four paths being exercised in this test hits that condition many times in the one second that the subtest is being run. Signed-off-by: Ross Zwisler <ross.zwisler@linux.intel.com> Reviewed-by: Eryu Guan <guaneryu@gmail.com> Signed-off-by: Eryu Guan <guaneryu@gmail.com>
65 lines
1.8 KiB
Bash
Executable File
65 lines
1.8 KiB
Bash
Executable File
#! /bin/bash
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# SPDX-License-Identifier: GPL-2.0
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# Copyright (c) 2018 Intel Corporation. All Rights Reserved.
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#
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# FS QA Test No. 503
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#
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# This is a regression test for kernel patch:
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# ext4: handle layout changes to pinned DAX mapping
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#
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# This test exercises each of the DAX paths in ext4 which remove blocks from
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# an inode's block map. This includes things like hole punch, truncate down,
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# etc. This test was written to regression test errors seen with an ext4 +
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# DAX setup, but the test runs fine with or without DAX and with XFS so we
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# don't require the DAX mount option or a specific filesystem for the test.
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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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}
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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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# Modify as appropriate.
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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_scratch
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_require_test_program "t_mmap_collision"
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_require_xfs_io_command "falloc"
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_require_xfs_io_command "fpunch"
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_require_xfs_io_command "fcollapse"
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_require_xfs_io_command "fzero"
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_scratch_mkfs >> $seqres.full 2>&1
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# To get the failure we turn off DAX on our SCRATCH_MNT so we can get O_DIRECT
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# behavior. We will continue to use unmodified mount options for the test
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# TEST_DIR. The failures fixed by the above mentioned kernel patch trigger
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# when those mount options include "-o dax", but the test runs fine without
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# that option so we don't require it.
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export MOUNT_OPTIONS=""
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_scratch_mount >> $seqres.full 2>&1
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# real QA test starts here
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$here/src/t_mmap_collision $TEST_DIR/testfile $SCRATCH_MNT/testfile
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# success, all done
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echo "Silence is golden"
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status=0
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exit
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