mirror of
https://github.com/linux-apfs/apfstests.git
synced 2026-05-01 15:01:44 -07:00
Ross Zwisler
729b2bc764
This test creates a file and writes to it via an mmap(), but never syncs via fsync/msync. This process is tracked via dm-log-writes, then replayed. If MAP_SYNC is working the dm-log-writes replay will show the test file with 1 MiB of on-media block allocations. This is because each allocating page fault included an implicit metadata sync. If MAP_SYNC isn't working (which you can test by removing the "-S" flag to xfs_io mmap) the file will be smaller or missing entirely. Note that dm-log-writes doesn't track the data that we write via the mmap(), so we can't do any data integrity checking. We can only verify that the metadata writes for the page faults happened. [eguan: add comments on _require_log_writes_dax and fix its cleanup] Signed-off-by: Ross Zwisler <ross.zwisler@linux.intel.com> Reviewed-by: Eryu Guan <eguan@redhat.com> Signed-off-by: Eryu Guan <eguan@redhat.com>
84 lines
2.2 KiB
Bash
Executable File
84 lines
2.2 KiB
Bash
Executable File
#! /bin/bash
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# FS QA Test No. 470
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#
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# Use dm-log-writes to verify that MAP_SYNC actually syncs metadata during
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# page faults.
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#
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#-----------------------------------------------------------------------
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# Copyright (c) 2017 Intel Corporation. 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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tmp=/tmp/$$
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here=`pwd`
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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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_log_writes_cleanup
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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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. ./common/dmlogwrites
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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_scratch
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_require_log_writes_dax
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_require_xfs_io_command "mmap" "-S"
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_require_xfs_io_command "log_writes"
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_log_writes_init
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_log_writes_mkfs >> $seqres.full 2>&1
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_log_writes_mount -o dax
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LEN=$((1024 * 1024)) # 1 MiB
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$XFS_IO_PROG -t -c "truncate $LEN" -c "mmap -S 0 $LEN" -c "mwrite 0 $LEN" \
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-c "log_writes -d $LOGWRITES_NAME -m preunmap" \
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-f $SCRATCH_MNT/test
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# Unmount the scratch dir and tear down the log writes target
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_log_writes_unmount
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_log_writes_remove
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_check_scratch_fs
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# destroy previous filesystem so we can be sure our rebuild works
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_scratch_mkfs >> $seqres.full 2>&1
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# check pre-unmap state
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_log_writes_replay_log preunmap
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_scratch_mount
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# We should see $SCRATCH_MNT/test as having 1 MiB in block allocations
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du -sh $SCRATCH_MNT/test | _filter_scratch | _filter_spaces
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status=0
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exit
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