mirror of
https://github.com/linux-apfs/apfstests.git
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93 lines
2.4 KiB
Bash
93 lines
2.4 KiB
Bash
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#! /bin/bash
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# SPDX-License-Identifier: GPL-2.0
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# Copyright (c) 2018 Red Hat Inc. All Rights Reserved.
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#
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# FS QA Test No. 500
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#
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# Race test running out of data space with concurrent discard operation on
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# dm-thin.
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#
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# If a user constructs a test that loops repeatedly over below steps on
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# dm-thin, block allocation can fail due to discards not having completed
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# yet (Fixed by a685557 dm thin: handle running out of data space vs
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# concurrent discard):
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# 1) fill thin device via filesystem file
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# 2) remove file
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# 3) fstrim
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#
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# And this maybe cause a deadlock when racing a fstrim with a filesystem
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# (XFS) shutdown. (Fixed by 8c81dd46ef3c Force log to disk before reading
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# the AGF during a fstrim)
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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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_dmthin_cleanup
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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/dmthin
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# remove previous $seqres.full before test
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rm -f $seqres.full
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# real QA test starts here
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_supported_fs generic
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_supported_os Linux
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_require_scratch_nocheck
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_require_dm_target thin-pool
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# Require underlying device support discard
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_scratch_mkfs >>$seqres.full 2>&1
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_scratch_mount
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_require_batched_discard $SCRATCH_MNT
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_scratch_unmount
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# Create a thin pool and a *slightly smaller* thin volume, it's helpful
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# to reproduce the bug
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BACKING_SIZE=$((128 * 1024 * 1024 / 512)) # 128M
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VIRTUAL_SIZE=$((BACKING_SIZE + 1024)) # 128M + 1k
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CLUSTER_SIZE=$((64 * 1024 / 512)) # 64K
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_dmthin_init $BACKING_SIZE $VIRTUAL_SIZE $CLUSTER_SIZE 0
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_dmthin_set_fail
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_mkfs_dev $DMTHIN_VOL_DEV
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_dmthin_mount
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# There're two bugs at here, one is dm-thin bug, the other is filesystem
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# (XFS especially) bug. The dm-thin bug can't handle running out of data
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# space with concurrent discard well. Then the dm-thin bug cause fs unmount
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# hang when racing a fstrim with a filesystem shutdown.
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#
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# If both of two bugs haven't been fixed, below test maybe cause deadlock.
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# Else if the fs bug has been fixed, but the dm-thin bug hasn't. below test
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# will cause the test fail (no deadlock).
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# Else the test will pass.
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for ((i=0; i<20; i++)); do
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$XFS_IO_PROG -f -c "pwrite -b 64k 0 256M" \
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$SCRATCH_MNT/testfile &>/dev/null
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rm -f $SCRATCH_MNT/testfile
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$FSTRIM_PROG $SCRATCH_MNT
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done
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_dmthin_check_fs
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_dmthin_cleanup
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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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