On Wed, Mar 14, 2018 at 09:16:18AM -0400, Vivek Goyal wrote:
> Typically, when following absolute redirect, if an opauqe dentry is
> found, lookup in further lower directories is stopped. But if a
> child dentry has another absolute redirect, then lookup in further
> lower layers should continue.
>
> Say, following is example setup.
> upper: /redirect (redirect=/a/b/c)
> lower1: /a/[b]/c ([b] is opaque) (c has absolute redirect=/a/b/d/)
> lower0: /a/b/d/foo
>
> "redirect" directory in upper should merge with lower1:/a/b/c/ and
> lower0:/a/b/d/, despite lower1:/a/b/ being opaque.
>
> This example and kernel fix has come from Amir Goldstein. I am just putting
> a test for it to make sure its not broken down the line.
>
> v3: Took care of more comments from amir.
> - Added some comments.
> - Added _overlay_check_scratch_dirs call.
>
> Signed-off-by: Vivek Goyal <vgoyal@xxxxxxxxxx>
> ---
> tests/overlay/057 | 100 ++++++++++++++++++++++++++++++++++++++++++++++++++
> tests/overlay/057.out | 2 +
> tests/overlay/group | 1
> 3 files changed, 103 insertions(+)
>
> Index: xfstests-dev/tests/overlay/057
> ===================================================================
> --- /dev/null 1970-01-01 00:00:00.000000000 +0000
> +++ xfstests-dev/tests/overlay/057 2018-03-14 09:10:00.577179042 -0400
> @@ -0,0 +1,100 @@
> +#! /bin/bash
> +# FS QA Test No. 057
> +#
> +# Test absolute redirect is followed even if ancestor is opaque
> +#
> +# Typically, when following absolute redirect, if an opauqe dentry is
> +# found, lookup in further lower directories is stopped. But if a
> +# child dentry has another absolute redirect, then lookup in further
> +# lower layers should continue.
> +#
> +# Say, following is example setup.
> +# upper: /redirect (redirect=/a/b/c)
> +# lower1: /a/[b]/c ([b] is opaque) (c has absolute redirect=/a/b/d/)
> +# lower0: /a/b/d/foo
> +#
> +# "redirect" directory in upper should merge with lower1:/a/b/c/ and
> +# lower0:/a/b/d/, despite lower1:/a/b/ being opaque.
> +#
> +#-----------------------------------------------------------------------
> +# Copyright (C) 2018 Red Hat, Inc. All Rights Reserved.
> +# Author: Vivek Goyal <vgoyal@xxxxxxxxxx>
> +#
> +# 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
> +
> +# remove previous $seqres.full before test
> +rm -f $seqres.full
> +
> +# real QA test starts here
> +_supported_fs overlay
> +_supported_os Linux
> +# We use non-default scratch underlying overlay dirs, we need to check
> +# them explicity after test.
> +_require_scratch_nocheck
> +_require_scratch_overlay_features redirect_dir
> +
> +# remove all files from previous tests
> +_scratch_mkfs
> +
> +# Create test directories
> +lowerdir=$OVL_BASE_SCRATCH_MNT/lower
> +lowerdir2=$OVL_BASE_SCRATCH_MNT/lower2
> +upperdir=$OVL_BASE_SCRATCH_MNT/upper
> +workdir=$OVL_BASE_SCRATCH_MNT/workdir
> +workdir2=$OVL_BASE_SCRATCH_MNT/workdir2
> +
> +mkdir -p $lowerdir $lowerdir2 $upperdir $workdir $workdir2
> +mkdir -p $lowerdir/origin
> +touch $lowerdir/origin/foo
> +_overlay_scratch_mount_dirs $lowerdir $lowerdir2 $workdir2 -o redirect_dir=on
> +
> +# Create opaque parent with absolute redirect child in middle layer
> +mkdir $SCRATCH_MNT/pure
> +mv $SCRATCH_MNT/origin $SCRATCH_MNT/pure/redirect
> +$UMOUNT_PROG $SCRATCH_MNT
> +_overlay_scratch_mount_dirs $lowerdir2:$lowerdir $upperdir $workdir -o redirect_dir=on
> +mv $SCRATCH_MNT/pure/redirect $SCRATCH_MNT/redirect
I think we'd better do a "ls $SCRATCH_MNT/redirect/" here too, right
after the rename and before mount cycle, to make sure 'foo' is there as
well. I can add it on commit (and change the .out file too) if this
change looks OK to you.
BTW, I stopped using eguan@xxxxxxxxxx, please refer to the following
email (though it's not so obvious..)
[ANNOUNCE] fstests: master branch updated to 5e6514523342, and Eryu's comming role change
https://www.spinics.net/lists/fstests/msg09052.html
Thanks,
Eryu
> +
> +# Verify that redirects are followed after mount cycle
> +$UMOUNT_PROG $SCRATCH_MNT
> +_overlay_scratch_mount_dirs $lowerdir2:$lowerdir $upperdir $workdir -o redirect_dir=on
> +ls $SCRATCH_MNT/redirect/
> +
> +# check overlayfs
> +_overlay_check_scratch_dirs "$lowerdir2:$lowerdir" $upperdir $workdir -o redirect_dir=on
> +
> +# success, all done
> +status=0
> +exit
> Index: xfstests-dev/tests/overlay/group
> ===================================================================
> --- xfstests-dev.orig/tests/overlay/group 2018-02-28 15:27:29.981693615 -0500
> +++ xfstests-dev/tests/overlay/group 2018-03-12 09:31:45.692818432 -0400
> @@ -59,3 +59,4 @@
> 054 auto quick copyup redirect exportfs
> 055 auto quick copyup redirect exportfs nonsamefs
> 056 auto quick fsck
> +057 auto quick redirect
> Index: xfstests-dev/tests/overlay/057.out
> ===================================================================
> --- /dev/null 1970-01-01 00:00:00.000000000 +0000
> +++ xfstests-dev/tests/overlay/057.out 2018-03-12 13:09:42.061818432 -0400
> @@ -0,0 +1,2 @@
> +QA output created by 057
> +foo
> --
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