From: Amir Goldstein Date: Thu, 24 Nov 2016 20:12:12 +0000 (+0200) Subject: overlay: test ro/rw fd data inconsistecies X-Git-Tag: v2022.05.01~2290 X-Git-Url: http://git.apps.os.sepia.ceph.com/?p=xfstests-dev.git;a=commitdiff_plain;h=d04d4bc07dc5aad7fa2b174a010533d13502ab43 overlay: test ro/rw fd data inconsistecies Introduce a new test to 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 This issue is about to be fixed with a patch set by Miklos Szeredi. Signed-off-by: Amir Goldstein Reviewed-by: Eryu Guan Signed-off-by: Eryu Guan --- diff --git a/tests/overlay/016 b/tests/overlay/016 new file mode 100755 index 00000000..6d3e3399 --- /dev/null +++ b/tests/overlay/016 @@ -0,0 +1,98 @@ +#! /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 +# +# 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 + +rm -f $seqres.full + +_scratch_mkfs >>$seqres.full 2>&1 + +# Create our test files. +lowerdir=$SCRATCH_DEV/$OVERLAY_LOWER_DIR +mkdir -p $lowerdir +echo "This is old news" > $lowerdir/foo +echo "This is old news" > $lowerdir/bar + +_scratch_mount + +cd $SCRATCH_MNT + +# +# case #1: +# open file for read (rofd) +# open file for write (rwfd) +# write to rwfd +# read from rofd +# +$XFS_IO_PROG << EOF | _filter_xfs_io +open -r foo +open foo +pwrite -S 0x61 0 16 +file 0 +pread -v 0 16 +EOF + +# +# case #2: +# mmap MAP_SHARED|PROT_READ of rofd +# write to rwfd +# read from mapped memory +# +$XFS_IO_PROG << EOF | _filter_xfs_io +open -r bar +mmap -r 0 16 +open bar +pwrite -S 0x61 0 16 +mread -v 0 16 +EOF + +status=0 +exit diff --git a/tests/overlay/016.out b/tests/overlay/016.out new file mode 100644 index 00000000..52b8cd7f --- /dev/null +++ b/tests/overlay/016.out @@ -0,0 +1,12 @@ +QA output created by 016 +xfs_io> xfs_io> xfs_io> wrote 16/16 bytes at offset 0 +XXX Bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec) +xfs_io> [000] foo (foreign,non-sync,non-direct,read-only) + 001 foo (foreign,non-sync,non-direct,read-write) +xfs_io> 00000000: 61 61 61 61 61 61 61 61 61 61 61 61 61 61 61 61 aaaaaaaaaaaaaaaa +read 16/16 bytes at offset 0 +XXX Bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec) +xfs_io> xfs_io> xfs_io> xfs_io> xfs_io> wrote 16/16 bytes at offset 0 +XXX Bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec) +xfs_io> 00000000: 61 61 61 61 61 61 61 61 61 61 61 61 61 61 61 61 aaaaaaaaaaaaaaaa +xfs_io> \ No newline at end of file diff --git a/tests/overlay/group b/tests/overlay/group index 84850b19..5740d2a2 100644 --- a/tests/overlay/group +++ b/tests/overlay/group @@ -18,3 +18,4 @@ 013 auto quick 014 auto quick copyup 015 auto quick whiteout +016 auto quick