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https://github.com/linux-apfs/apfstests.git
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Brian Foster
e78ae074b2
This test is based on generic/033, which originally used zero range operations to reproduce indlen reservation problems. Zero range now includes a pagecache flush before it updates extents, which means generic/033 is no longer able to reproduce the problem it was originally written to test. Create a new test that uses an XFS-specific mechanism (in DEBUG mode) to induce delalloc extent splits and reproduce the problem originally reproduced by generic/033. In addition, update the test to include a larger buffered write pattern that is known to reproduce premature indlen exhaustion on delalloc extents. Signed-off-by: Brian Foster <bfoster@redhat.com> Reviewed-by: Eryu Guan <eguan@redhat.com> Signed-off-by: Eryu Guan <eguan@redhat.com>
110 lines
3.6 KiB
Bash
Executable File
110 lines
3.6 KiB
Bash
Executable File
#! /bin/bash
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# FS QA Test No. 196
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#
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# This test stresses indirect block reservation for delayed allocation extents.
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# XFS reserves extra blocks for deferred allocation of delalloc extents. These
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# reserved blocks can be divided among more extents than anticipated if the
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# original extent for which the blocks were reserved is split into multiple
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# delalloc extents. If this scenario repeats, eventually some extents are left
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# without any indirect block reservation whatsoever. This leads to assert
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# failures and possibly other problems in XFS.
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#
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#-----------------------------------------------------------------------
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# Copyright (c) 2017 Red Hat, Inc. 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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}
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# get standard environment, filters and checks
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. ./common/rc
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. ./common/punch
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# real QA test starts here
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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_scratch
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_require_xfs_sysfs $(_short_dev $TEST_DEV)/drop_writes
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_scratch_mkfs >/dev/null 2>&1
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_scratch_mount
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sdev=$(_short_dev $SCRATCH_DEV)
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file=$SCRATCH_MNT/file.$seq
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bytes=$((64 * 1024))
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# create sequential delayed allocation
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$XFS_IO_PROG -f -c "pwrite 0 $bytes" $file >> $seqres.full 2>&1
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# Enable write drops. All buffered writes are dropped from this point on.
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echo 1 > /sys/fs/xfs/$sdev/drop_writes
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# Write every other 4k range to split the larger delalloc extent into many more
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# smaller extents. Use pwrite because with write failures enabled, all
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# preexisting delalloc blocks in the range of the I/O are tossed without
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# discretion. This allows manipulation of the delalloc extent without conversion
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# to real blocks (and thus releasing the indirect reservation).
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endoff=$((bytes - 4096))
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for i in $(seq 0 8192 $endoff); do
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$XFS_IO_PROG -c "pwrite $i 4k" $file >> $seqres.full 2>&1
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done
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# now pwrite the opposite set to remove remaining delalloc extents
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for i in $(seq 4096 8192 $endoff); do
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$XFS_IO_PROG -c "pwrite $i 4k" $file >> $seqres.full 2>&1
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done
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echo 0 > /sys/fs/xfs/$sdev/drop_writes
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_scratch_cycle_mount
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$XFS_IO_PROG -c 'bmap -vp' $file | _filter_bmap
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# Now test a buffered write workload with larger extents. Write a 100m extent,
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# split it at the 3/4 mark, then write another 100m extent that is contiguous
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# with the 1/4 portion of the split extent. Repeat several times. This pattern
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# is known to prematurely exhaust indirect reservations and cause warnings and
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# assert failures.
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rm -f $file
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for offset in $(seq 0 100 500); do
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$XFS_IO_PROG -fc "pwrite ${offset}m 100m" $file >> $seqres.full 2>&1
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punchoffset=$((offset + 75))
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echo 1 > /sys/fs/xfs/$sdev/drop_writes
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$XFS_IO_PROG -c "pwrite ${punchoffset}m 4k" $file >> $seqres.full 2>&1
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echo 0 > /sys/fs/xfs/$sdev/drop_writes
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done
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echo "Silence is golden."
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status=0
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exit
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