On Tue, Mar 10, 2015 at 7:46 AM, Qu Wenruo <quwenruo@xxxxxxxxxxxxxx> wrote:
> [Problem]
> Since commit fcebe4562dec83b3f8d308 ("Btrfs: rework qgroup accounting"),
> quota data update is delayed after delayed_ref calculation, and lacks
> correct protection to detect root reference which shouldn't be counted
> in current sequence number but already written into extent backref.
>
> This makes exclusive reference not decreased correctly and give incorrect
> result.
>
> [Test procedure]
> 1. Create a btrfs with 3 subvolumes, quota enabled and rescanned.
> 2. Create a file in 1st subvolume
> 3. Clone the file to 2nd and 3rd subvolume
> 4. Sync the fs to reflect the changes in qgroup.
> 5. Check the qgroup data
>
> [Expected result]
> None of the subvolume has exclusive reference to the file.
>
> [Actual result]
> The first subvolume still have exclusive reference to the file.
>
> Signed-off-by: Qu Wenruo <quwenruo@xxxxxxxxxxxxxx>
> ---
> tests/btrfs/083 | 76 +++++++++++++++++++++++++++++++++++++++++++++++++++++
> tests/btrfs/083.out | 5 ++++
> tests/btrfs/group | 1 +
> 3 files changed, 82 insertions(+)
> create mode 100755 tests/btrfs/083
> create mode 100644 tests/btrfs/083.out
>
> diff --git a/tests/btrfs/083 b/tests/btrfs/083
> new file mode 100755
> index 0000000..17fd30b
> --- /dev/null
> +++ b/tests/btrfs/083
> @@ -0,0 +1,76 @@
> +#! /bin/bash
> +# FS QA Test No. 083
> +#
> +# Test for incorrect exclusive reference count after cloning file
> +# between subvolumes.
> +#
> +#-----------------------------------------------------------------------
> +# Copyright (c) 2015 Fujitsu. All Rights Reserved.
> +#
> +# 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()
> +{
> + rm -f $tmp.*
> +}
> +
> +# get standard environment, filters and checks
> +. ./common/rc
> +. ./common/filter
> +
> +# real QA test starts here
> +
> +# Modify as appropriate.
> +_need_to_be_root
> +_supported_fs btrfs
> +_supported_os Linux
> +_require_scratch
> +_require_cp_reflink
> +
> +run_check _scratch_mkfs "--nodesize 4096"
--nodesize 65536
Otherwise the test fails (unnecessarily) on platforms with a page size > 4Kb.
> +
> +# inode cache will also take space in fs tree, disable them to get consistent
> +# result.
> +run_check _scratch_mount "-o noinode_cache"
-o noinode_cache, unlike -o inode_cache, is still a relatively new
mount option (early 2014). Won't the test fail on older kernels that
don't recognize this mount option?
> +
> +_run_btrfs_util_prog subvolume create $SCRATCH_MNT/subv1
> +_run_btrfs_util_prog subvolume create $SCRATCH_MNT/subv2
> +_run_btrfs_util_prog subvolume create $SCRATCH_MNT/subv3
> +
> +_run_btrfs_util_prog quota enable $SCRATCH_MNT
> +_run_btrfs_util_prog quota rescan -w $SCRATCH_MNT
> +
> +dd if=/dev/zero of=$SCRATCH_MNT/subv1/file1 bs=4K count=64 &> /dev/null
Why ignore dd failures? Normally we want the output (specially errors)
to be matched against the golden output.
> +cp --reflink $SCRATCH_MNT/subv1/file1 $SCRATCH_MNT/subv2/file1
> +cp --reflink $SCRATCH_MNT/subv1/file1 $SCRATCH_MNT/subv3/file1
> +_run_btrfs_util_prog filesystem sync $SCRATCH_MNT
Plain old 'sync' should work here as well.
thanks Qu
> +
> +units=`_btrfs_qgroup_units`
> +$BTRFS_UTIL_PROG qgroup show $units $SCRATCH_MNT | $SED_PROG -n '/[0-9]/p' \
> + | $AWK_PROG '{print $2" "$3}'
> +
> +# success, all done
> +status=0
> +exit
> diff --git a/tests/btrfs/083.out b/tests/btrfs/083.out
> new file mode 100644
> index 0000000..359b4a0
> --- /dev/null
> +++ b/tests/btrfs/083.out
> @@ -0,0 +1,5 @@
> +QA output created by 083
> +4096 4096
> +266240 4096
> +266240 4096
> +266240 4096
> diff --git a/tests/btrfs/group b/tests/btrfs/group
> index fd2fa76..04d5d67 100644
> --- a/tests/btrfs/group
> +++ b/tests/btrfs/group
> @@ -85,3 +85,4 @@
> 080 auto snapshot
> 081 auto quick clone
> 082 auto quick remount
> +083 auto quick qgroup
> --
> 2.3.1
>
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