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https://github.com/linux-apfs/apfstests.git
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Amir Goldstein
fa8ec339e6
Introduce a new test to demonstrate a known issue with overlayfs: - stat file A shows inode number X - modify A to trigger copy up - stat file A shows inode number Y != X Also test if d_ino of readdir entries changes after copy up. There is a POC patch by Miklos Szeredi that fixes this issue. Not dealing with hardlinks here, because there is more to test then stable inode number. Hardlinks will get a test of their own. Signed-off-by: Amir Goldstein <amir73il@gmail.com> Reviewed-by: Eryu Guan <eguan@redhat.com> Signed-off-by: Eryu Guan <eguan@redhat.com>
100 lines
2.5 KiB
Bash
Executable File
100 lines
2.5 KiB
Bash
Executable File
#! /bin/bash
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# FSQA Test No. 017
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#
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# Test unstable inode number
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#
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# This simple test demonstrates a known issue with overlayfs:
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# - stat file A shows inode number X
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# - modify A to trigger copy up
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# - stat file A shows inode number Y != X
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#
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# Also test if d_ino of readdir entries changes after copy up.
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#
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#-----------------------------------------------------------------------
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#
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# Copyright (C) 2016 CTERA Networks. All Rights Reserved.
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# Author: Amir Goldstein <amir73il@gmail.com>
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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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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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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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# real QA test starts here
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_supported_fs overlay
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_supported_os Linux
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_require_scratch
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rm -f $seqres.full
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_scratch_mkfs >>$seqres.full 2>&1
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# Create our test files.
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# Not dealing with hardlinks here, because there is more to test
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# then stable inode number.
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# Hardlinks will get a test of their own.
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lowerdir=$SCRATCH_DEV/$OVERLAY_LOWER_DIR
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mkdir -p $lowerdir
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mkdir $lowerdir/dir
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touch $lowerdir/file
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ln -s $lowerdir/file $lowerdir/symlink
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mknod $lowerdir/chrdev c 1 1
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mknod $lowerdir/blkdev b 1 1
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mknod $lowerdir/fifo p
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_scratch_mount
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rm -f $tmp.before $tmp.after
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# Test stable stat(2) st_ino
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# Record inode numbers before and after copy up
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for f in dir file symlink chrdev blkdev fifo; do
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ls -id $SCRATCH_MNT/$f >> $tmp.before
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# chown -h modifies all those file types
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chown -h 100 $SCRATCH_MNT/$f
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ls -id $SCRATCH_MNT/$f >> $tmp.after
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done
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# Test stable readdir(3)/getdents(2) d_ino
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# find by inode number - expect to find file by inode number
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cat $tmp.before | while read ino f; do
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find $f -inum $ino -maxdepth 0 | _filter_scratch
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done
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# Compare before..after - expect silence
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diff $tmp.before $tmp.after
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status=0
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exit
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