Re: [PATCH] ceph: add a new test for cross quota realms renames

[Eryu Guan <guan@eryu.me>]

On Thu, Nov 19, 2020 at 02:19:56PM +0000, Luis Henriques wrote:
> For the moment cross quota realms renames has been disabled in CephFS
> after a bug has been found while renaming files created and truncated.
> This allowed clients to easily circumvent quotas.
> 
> Link: https://tracker.ceph.com/issues/48203
> Signed-off-by: Luis Henriques <lhenriques@suse.de>

Thanks for the test! It'd be great if ceph folks could help review &
test it as well, as I don't have a cephfs test env yet..

Some minor comments below.

> ---
>  tests/ceph/004     | 94 ++++++++++++++++++++++++++++++++++++++++++++++
>  tests/ceph/004.out |  2 +
>  tests/ceph/group   |  1 +
>  3 files changed, 97 insertions(+)
>  create mode 100755 tests/ceph/004
>  create mode 100644 tests/ceph/004.out
> 
> diff --git a/tests/ceph/004 b/tests/ceph/004
> new file mode 100755
> index 000000000000..4021666b138e
> --- /dev/null
> +++ b/tests/ceph/004
> @@ -0,0 +1,94 @@
> +#! /bin/bash
> +# SPDX-License-Identifier: GPL-2.0
> +# Copyright (c) 2020 SUSE Linux Products GmbH. All Rights Reserved.
> +#
> +# FS QA Test 004
> +#
> +# Tests a bug fix found in cephfs quotas handling.  Here's a simplified testcase
> +# that *should* fail:
> +#
> +#    mkdir files limit
> +#    truncate files/file -s 10G
> +#    setfattr limit -n ceph.quota.max_bytes -v 1000000
> +#    mv files limit/
> +#
> +# Because we're creating a new file and truncating it, we have Fx caps and thus
> +# the truncate operation will be cached.  This prevents the MDSs from updating
> +# the quota realms and thus the client will allow the above rename(2) to happen.
> +#
> +# The bug resulted in dropping support for cross quota-realms renames, reverting
> +# kernel commit dffdcd71458e ("ceph: allow rename operation under different
> +# quota realms").
> +#
> +# So, the above test will now fail with a -EXDEV or, in the future (when we have
> +# a proper fix), with -EDQUOT.
> +#
> +# This bug was tracker here:
> +#
> +#   https://tracker.ceph.com/issues/48203
> +#
> +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
> +. ./common/attr
> +
> +# remove previous $seqres.full before test
> +rm -f $seqres.full
> +
> +# real QA test starts here
> +
> +_supported_fs ceph
> +_require_attrs
> +_require_test

Need '_require_test_program "rename"' as well.

> +
> +workdir=$TEST_DIR/test-$seq
> +
> +orig1=$workdir/orig1
> +orig2=$workdir/orig2
> +file1=$orig1/file
> +file2=$orig2/file
> +dest=$workdir/dest
> +
> +rm -rf $workdir
> +mkdir $workdir
> +mkdir $orig1 $orig2 $dest
> +
> +# set quota to 1m
> +$SETFATTR_PROG -n ceph.quota.max_bytes -v 1000000 $dest
> +# set quota to 20g
> +$SETFATTR_PROG -n ceph.quota.max_bytes -v 20000000000 $orig2
> +
> +#
> +# The following 2 testcases shall fail with either -EXDEV or -EDQUOT
> +#
> +
> +# from 'root' realm to $dest realm
> +$XFS_IO_PROG -f -c "truncate 10G" $file1
> +$here/src/rename $orig1 $dest/new1 >> $seqres.full 2>&1
> +[ $? -ne 1 ] && _fatal "cross quota realms rename succeeded"

Use _fail instead of _fatal in test, _fatal is usually used in common
helpers, to report internal errors such as wrong usage of helpers.

> +
> +# from $orig2 realm to $dest realm
> +$XFS_IO_PROG -f -c "truncate 10G" $file2
> +$here/src/rename $orig2 $dest/new2 >> $seqres.full 2>&1
> +[ $? -ne 1 ] && _fatal "cross quota realms rename succeeded"

Same here.

Thanks,
Eryu

> +
> +echo "Silence is golden"
> +
> +# success, all done
> +status=0
> +exit
> diff --git a/tests/ceph/004.out b/tests/ceph/004.out
> new file mode 100644
> index 000000000000..af8614ae45ac
> --- /dev/null
> +++ b/tests/ceph/004.out
> @@ -0,0 +1,2 @@
> +QA output created by 004
> +Silence is golden
> diff --git a/tests/ceph/group b/tests/ceph/group
> index adbf61547766..47903d21966c 100644
> --- a/tests/ceph/group
> +++ b/tests/ceph/group
> @@ -1,3 +1,4 @@
>  001 auto quick copy
>  002 auto quick copy
>  003 auto quick copy
> +004 auto quick quota