| #! /bin/bash |
| # FSQA Test No. 016 |
| # |
| # Test ro/rw fd data inconsistecies |
| # |
| # This simple test demonstrates a known issue with overlayfs: |
| # - process A opens file F for read |
| # - process B writes new data to file F |
| # - process A reads old data from file F |
| # |
| #----------------------------------------------------------------------- |
| # |
| # 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" |
| |
| 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_xfs_io_command "open" |
| |
| rm -f $seqres.full |
| |
| _scratch_mkfs >>$seqres.full 2>&1 |
| |
| # Create our test files. |
| lowerdir=$OVL_BASE_SCRATCH_MNT/$OVL_LOWER |
| mkdir -p $lowerdir |
| echo "This is old news" > $lowerdir/foo |
| echo "This is old news" > $lowerdir/bar |
| |
| _scratch_mount |
| |
| |
| # |
| # case #1: |
| # open file for read (rofd) |
| # open file for write (rwfd) |
| # write to rwfd |
| # read from rofd |
| # |
| $XFS_IO_PROG -r $SCRATCH_MNT/foo \ |
| -C "open $SCRATCH_MNT/foo" \ |
| -C "pwrite -S 0x61 0 16" \ |
| -C "file 0" \ |
| -C "pread -v 0 16" \ |
| | _filter_xfs_io | _filter_scratch |
| |
| # |
| # case #2: |
| # mmap MAP_SHARED|PROT_READ of rofd |
| # write to rwfd |
| # read from mapped memory |
| # |
| $XFS_IO_PROG -r $SCRATCH_MNT/bar \ |
| -C "mmap -r 0 16" \ |
| -C "open $SCRATCH_MNT/bar" \ |
| -C "pwrite -S 0x61 0 16" \ |
| -C "mread -v 0 16" \ |
| | _filter_xfs_io | _filter_scratch |
| |
| status=0 |
| exit |