| #! /bin/bash |
| # FSQA Test No. 017 |
| # |
| # Test constant inode numbers |
| # |
| # This simple test demonstrates 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 |
| # and if inode numbers persist after rename, drop caches and |
| # mount cycle. |
| # |
| #----------------------------------------------------------------------- |
| # |
| # Copyright (C) 2016 CTERA Networks. All Rights Reserved. |
| # Author: Amir Goldstein <amir73il@gmail.com> |
| # |
| # This program is free software; you can redistribute it and/or |
| # modify it under the terms of the GNU General Public License as |
| # published by the Free Software Foundation. |
| # |
| # This program is distributed in the hope that it would be useful, |
| # but WITHOUT ANY WARRANTY; without even the implied warranty of |
| # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| # GNU General Public License for more details. |
| # |
| # You should have received a copy of the GNU General Public License |
| # along with this program; if not, write the Free Software Foundation, |
| # Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
| #----------------------------------------------------------------------- |
| # |
| |
| seq=`basename $0` |
| seqres=$RESULT_DIR/$seq |
| echo "QA output created by $seq" |
| |
| here=`pwd` |
| tmp=/tmp/$$ |
| status=1 # failure is the default! |
| trap "_cleanup; exit \$status" 0 1 2 3 15 |
| |
| _cleanup() |
| { |
| cd / |
| rm -f $tmp.* |
| } |
| |
| # get standard environment, filters and checks |
| . ./common/rc |
| . ./common/filter |
| |
| # real QA test starts here |
| _supported_fs overlay |
| _supported_os Linux |
| _require_scratch |
| _require_test_program "af_unix" |
| _require_test_program "t_dir_type" |
| # Require redirect_dir for renaming a merge directory |
| _require_scratch_feature redirect_dir |
| |
| rm -f $seqres.full |
| |
| _scratch_mkfs >>$seqres.full 2>&1 |
| |
| # Create our test files. |
| lowerdir=$OVL_BASE_SCRATCH_MNT/$OVL_LOWER |
| mkdir -p $lowerdir |
| mkdir $lowerdir/dir |
| touch $lowerdir/file |
| ln -s $lowerdir/file $lowerdir/symlink |
| mknod $lowerdir/chrdev c 1 1 |
| mknod $lowerdir/blkdev b 1 1 |
| mknod $lowerdir/fifo p |
| $here/src/af_unix $lowerdir/socket |
| |
| FILES="dir file symlink chrdev blkdev fifo socket" |
| |
| # Record inode numbers in format <ino> <basename> |
| function record_inode_numbers() |
| { |
| dir=$1 |
| outfile=$2 |
| |
| for f in $FILES; do |
| ls -id $dir/$f |
| done | \ |
| while read ino file; do |
| echo $ino `basename $file` >> $outfile |
| done |
| } |
| |
| # Check inode numbers match recorder inode numbers |
| function check_inode_numbers() |
| { |
| dir=$1 |
| before=$2 |
| after=$3 |
| |
| record_inode_numbers $dir $after |
| |
| # Test constant stat(2) st_ino - |
| # Compare before..after - expect silence |
| # We use diff -u so out.bad will tell us which stage failed |
| diff -u $before $after |
| |
| # Test constant readdir(3)/getdents(2) d_ino - |
| # Expect to find file by inode number |
| cat $before | while read ino f; do |
| $here/src/t_dir_type $dir $ino | grep -q $f || \ |
| echo "$f not found by ino $ino (from $before)" |
| done |
| } |
| |
| # Enable redirect_dir for renaming a merge directory |
| _scratch_mount "-o redirect_dir=on" |
| |
| rm -f $tmp.* |
| testdir=$SCRATCH_MNT/test |
| mkdir -p $testdir |
| |
| # Record inode numbers before copy up |
| record_inode_numbers $SCRATCH_MNT $tmp.before |
| |
| for f in $FILES; do |
| # chown -h modifies all those file types |
| chown -h 100 $SCRATCH_MNT/$f |
| done |
| |
| # Compare inode numbers before/after copy up |
| check_inode_numbers $SCRATCH_MNT $tmp.before $tmp.after_copyup |
| |
| for f in $FILES; do |
| # move to another dir |
| mv $SCRATCH_MNT/$f $testdir/ |
| done |
| |
| echo 3 > /proc/sys/vm/drop_caches |
| |
| # Compare inode numbers before/after rename and drop caches |
| check_inode_numbers $testdir $tmp.after_copyup $tmp.after_move |
| |
| # Verify that the inode numbers survive a mount cycle |
| _scratch_cycle_mount "redirect_dir=on" |
| |
| # Compare inode numbers before/after mount cycle |
| check_inode_numbers $testdir $tmp.after_move $tmp.after_cycle |
| |
| echo "Silence is golden" |
| status=0 |
| exit |