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Date:   Tue, 14 May 2019 09:28:38 -0600
From:   Andreas Dilger <adilger@...ger.ca>
To:     Zorro Lang <zlang@...hat.com>
Cc:     fstests@...r.kernel.org, linux-ext4@...r.kernel.org,
        linux-xfs@...r.kernel.org
Subject: Re: [PATCH] generic: test statfs on project quota directory

On May 12, 2019, at 7:49 PM, Zorro Lang <zlang@...hat.com> wrote:
> 
> There's a bug on xfs cause statfs get negative f_ffree value from
> a project quota directory. It's fixed by "de7243057 fs/xfs: fix
> f_ffree value for statfs when project quota is set". So add statfs
> testing on project quota block and inode count limit.
> 
> For testing foreign fs quota, change _qmount() function, turn on
> project if quotaon support.
> 
> Signed-off-by: Zorro Lang <zlang@...hat.com>
> ---
> 
> Hi,
> 
> (Long time passed, re-send this patch again to get reviewing)
> 
> There's one thing I don't understand, so CC ext4 mail list. Please
> feel free to reply, if anyone knows that:
> 
> $ mkfs.ext4 $SCRATCH_DEV
> $ tune2fs -O quota,project $SCRATCH_DEV
> $ mount $SCRATCH_DEV $SCRATCH_MNT -o prjquota
> $ quotaon -P $SCRATCH_MNT
> $ mkdir $SCRATCH_MNT/t
> $ xfs_quota -f -x -c "project -p $SCRATCH_MNT/t -s 42" $SCRATCH_MNT
> $ xfs_quota -f -x -c "limit -p bsoft=100m answer" $SCRATCH_MNT
> $ df -k $SCRATCH_MNT/t
> Filesystem    1K-blocks  Used Available Use% Mounted on
> SCRATCH_DEV    102400     4    102396   1% SCRATCH_MNT
> 
> On XFS, the 'Used' field always shows '0'. But why ext4 always has
> more 4k? Is it a bug or expected.

Each directory in ext4 consumes a 4KB block, so setting the project
quota on a directory always consumes at least one block.

Cheers, Andreas

> common/quota          |  4 +++
> tests/generic/999     | 74 +++++++++++++++++++++++++++++++++++++++++++
> tests/generic/999.out |  3 ++
> tests/generic/group   |  1 +
> 4 files changed, 82 insertions(+)
> create mode 100755 tests/generic/999
> create mode 100644 tests/generic/999.out
> 
> diff --git a/common/quota b/common/quota
> index f19f81a1..315df8cb 100644
> --- a/common/quota
> +++ b/common/quota
> @@ -200,6 +200,10 @@ _qmount()
>    if [ "$FSTYP" != "xfs" ]; then
>        quotacheck -ug $SCRATCH_MNT >>$seqres.full 2>&1
>        quotaon -ug $SCRATCH_MNT >>$seqres.full 2>&1
> +	# try to turn on project quota if it's supported
> +	if quotaon --help 2>&1 | grep -q '\-\-project'; then
> +		quotaon --project $SCRATCH_MNT >>$seqres.full 2>&1
> +	fi
>    fi
>    chmod ugo+rwx $SCRATCH_MNT
> }
> diff --git a/tests/generic/999 b/tests/generic/999
> new file mode 100755
> index 00000000..555341f1
> --- /dev/null
> +++ b/tests/generic/999
> @@ -0,0 +1,74 @@
> +#! /bin/bash
> +# SPDX-License-Identifier: GPL-2.0
> +# Copyright (c) 2019 Red Hat, Inc.  All Rights Reserved.
> +#
> +# FS QA Test No. 999
> +#
> +# Test statfs when project quota is set.
> +# Uncover de7243057 fs/xfs: fix f_ffree value for statfs when project quota is set
> +#
> +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 /
> +	_scratch_unmount
> +	rm -f $tmp.*
> +}
> +
> +# get standard environment, filters and checks
> +. ./common/rc
> +. ./common/filter
> +. ./common/quota
> +
> +# remove previous $seqres.full before test
> +rm -f $seqres.full
> +
> +# real QA test starts here
> +_supported_fs generic
> +_supported_os Linux
> +_require_scratch
> +_require_quota
> +_require_xfs_quota_foreign
> +
> +_scratch_mkfs >/dev/null 2>&1
> +_scratch_enable_pquota
> +_qmount_option "prjquota"
> +_qmount
> +_require_prjquota $SCRATCH_DEV
> +
> +# Create a directory to be project object, and create a file to take 64k space
> +mkdir $SCRATCH_MNT/t
> +$XFS_IO_PROG -f -c "pwrite 0 65536" -c sync $SCRATCH_MNT/t/file >>$seqres.full
> +
> +# Setup temporary replacements for /etc/projects and /etc/projid
> +cat >$tmp.projects <<EOF
> +42:$SCRATCH_MNT/t
> +EOF
> +
> +cat >$tmp.projid <<EOF
> +answer:42
> +EOF
> +
> +quota_cmd="$XFS_QUOTA_PROG -D $tmp.projects -P $tmp.projid"
> +$quota_cmd -x -c 'project -s answer' $SCRATCH_MNT >/dev/null 2>&1
> +$quota_cmd -x -c 'limit -p isoft=53 bsoft=100m answer' $SCRATCH_MNT
> +
> +# The itotal and size should be 53 and 102400(k), as above project quota limit.
> +# The isued and used should be 2 and 64(k), as this case takes. But ext4 always
> +# shows more 4k 'used' space than XFS, it prints 68k at here. So filter the
> +# 6[48] at the end.
> +df -k --output=file,itotal,iused,size,used $SCRATCH_MNT/t | \
> +	_filter_scratch | _filter_spaces | \
> +	sed -e "/SCRATCH_MNT/s/6[48]/N/"
> +
> +# success, all done
> +status=0
> +exit
> diff --git a/tests/generic/999.out b/tests/generic/999.out
> new file mode 100644
> index 00000000..1bebabd4
> --- /dev/null
> +++ b/tests/generic/999.out
> @@ -0,0 +1,3 @@
> +QA output created by 999
> +File Inodes IUsed 1K-blocks Used
> +SCRATCH_MNT/t 53 2 102400 N
> diff --git a/tests/generic/group b/tests/generic/group
> index 9f4845c6..35da10a5 100644
> --- a/tests/generic/group
> +++ b/tests/generic/group
> @@ -542,3 +542,4 @@
> 537 auto quick trim
> 538 auto quick aio
> 539 auto quick punch seek
> +999 auto quick quota
> --
> 2.17.2
> 


Cheers, Andreas








Cheers, Andreas






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