mirror of
https://github.com/linux-apfs/apfstests.git
synced 2026-05-01 15:01:44 -07:00
Amir Goldstein
cf0e25209d
Overlayfs directory inodes are constant across copy up, but not persistent on mount cycle. Compare the inode numbers before and after mount cycle. Signed-off-by: Amir Goldstein <amir73il@gmail.com> Reviewed-by: Eryu Guan <eguan@redhat.com> Signed-off-by: Eryu Guan <eguan@redhat.com>
152 lines
3.7 KiB
Bash
Executable File
152 lines
3.7 KiB
Bash
Executable File
#! /bin/bash
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# FSQA Test No. 017
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#
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# Test constant inode numbers
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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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# and if inode numbers persist after rename, drop caches and
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# mount cycle.
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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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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/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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_require_test_program "af_unix"
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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, when hardlinks are broken they
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# should not preserve the inode number.
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lowerdir=$OVL_BASE_SCRATCH_MNT/$OVL_LOWER
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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 $lowerdir/fifo p
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$here/src/af_unix $lowerdir/socket
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FILES="dir file symlink chrdev blkdev fifo socket"
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# Record inode numbers in format <ino> <basename>
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function record_inode_numbers()
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{
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dir=$1
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outfile=$2
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for f in $FILES; do
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ls -id $dir/$f
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done | \
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while read ino file; do
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echo $ino `basename $file` >> $outfile
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done
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}
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# Check inode numbers match recorder inode numbers
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function check_inode_numbers()
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{
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dir=$1
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before=$2
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after=$3
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record_inode_numbers $dir $after
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# Test constant stat(2) st_ino -
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# Compare before..after - expect silence
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# We use diff -u so out.bad will tell us which stage failed
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diff -u $before $after
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# Test constant readdir(3)/getdents(2) d_ino -
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# Expect to find file by inode number
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cat $before | while read ino f; do
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find $dir/ -maxdepth 1 -inum $ino | grep -q $f || \
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echo "$f not found by ino $ino (from $before)"
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done
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}
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_scratch_mount
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rm -f $tmp.*
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testdir=$SCRATCH_MNT/test
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mkdir -p $testdir
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# Record inode numbers before copy up
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record_inode_numbers $SCRATCH_MNT $tmp.before
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for f in $FILES; do
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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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done
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# Compare inode numbers before/after copy up
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check_inode_numbers $SCRATCH_MNT $tmp.before $tmp.after_copyup
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for f in $FILES; do
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# move to another dir
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mv $SCRATCH_MNT/$f $testdir/
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done
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echo 3 > /proc/sys/vm/drop_caches
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# Compare inode numbers before/after rename and drop caches
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check_inode_numbers $testdir $tmp.after_copyup $tmp.after_move
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# Verify that the inode numbers survive a mount cycle
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_scratch_cycle_mount
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# Compare inode numbers before/after mount cycle
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check_inode_numbers $testdir $tmp.after_move $tmp.after_cycle
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echo "Silence is golden"
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status=0
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exit
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