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https://github.com/linux-apfs/apfstests.git
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Darrick J. Wong
9184ca155d
Perform copy-on-writes at random offsets to stress the CoW allocation system. Assess the effectiveness of the extent size hint at combatting fragmentation via unshare, a rewrite, and no-op after the random writes. Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
108 lines
3.2 KiB
Bash
Executable File
108 lines
3.2 KiB
Bash
Executable File
#! /bin/bash
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# FS QA Test No. 182
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#
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# Test fragmentation after a lot of random CoW:
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# - Create two reflinked files. Set extsz hint on second file.
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# - Directio write to random offsets to scatter CoW reservations.
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# - Rewrite the whole file to use up reservations.
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# - Check the number of extents.
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#
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#-----------------------------------------------------------------------
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# Copyright (c) 2016, Oracle and/or its affiliates. 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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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 -rf $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/reflink
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# real QA test starts here
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_supported_os Linux
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_supported_fs xfs
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_require_scratch_reflink
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_require_cp_reflink
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_require_fiemap
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_require_xfs_io_command "cowextsize"
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_require_odirect
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rm -f $seqres.full
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echo "Format and mount"
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_scratch_mkfs > $seqres.full 2>&1
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_scratch_mount >> $seqres.full 2>&1
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testdir=$SCRATCH_MNT/test-$seq
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mkdir $testdir
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blksz=65536
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nr=128
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filesize=$((blksz * nr))
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bufnr=16
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bufsize=$((blksz * bufnr))
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_require_fs_space $SCRATCH_MNT $((filesize / 1024 * 3 * 5 / 4))
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real_blksz=$(stat -f -c '%S' $testdir)
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internal_blks=$((filesize / real_blksz))
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echo "Create the original files"
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$XFS_IO_PROG -f -c "pwrite -S 0x61 -b $bufsize 0 $((filesize + 1))" $testdir/file1 >> $seqres.full
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$XFS_IO_PROG -f -c "cowextsize $bufsize" $testdir/file2
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_cp_reflink $testdir/file1 $testdir/file2 >> $seqres.full
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_scratch_remount
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echo "Compare files"
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md5sum $testdir/file1 | _filter_scratch
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md5sum $testdir/file2 | _filter_scratch
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echo "CoW and unmount"
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$XFS_IO_PROG -f -c "cowextsize" $testdir/file2 >> $seqres.full
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$XFS_IO_PROG -d -f -c "pwrite -R -S 0x63 -b $real_blksz 0 $((filesize + 1))" $testdir/file2 >> $seqres.full
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$XFS_IO_PROG -d -f -c "pwrite -S 0x63 -b $real_blksz 0 $((filesize + 1))" $testdir/file2 >> $seqres.full
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_scratch_remount
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echo "Compare files"
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md5sum $testdir/file1 | _filter_scratch
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md5sum $testdir/file2 | _filter_scratch
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echo "Check extent counts"
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old_extents=$(_count_extents $testdir/file1)
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new_extents=$(_count_extents $testdir/file2)
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echo "old extents: $old_extents" >> $seqres.full
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echo "new extents: $new_extents" >> $seqres.full
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echo "maximum extents: $internal_blks" >> $seqres.full
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test $new_extents -lt $((internal_blks / 20)) || test $new_extents -lt 15 \
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|| echo "file2 badly fragmented"
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# success, all done
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status=0
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exit
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