linux-kernel - Re: [PATCH 4.19 062/114] f2fs: choose hardlimit when softlimit is larger than hardlimit in f2fs_statfs

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Message-ID: <20200103171213.GC14328@amd>
Date:   Fri, 3 Jan 2020 18:12:13 +0100
From:   Pavel Machek <pavel@...x.de>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        Chengguang Xu <cgxu519@...ernel.net>,
        Chao Yu <yuchao0@...wei.com>, Jaegeuk Kim <jaegeuk@...nel.org>,
        Sasha Levin <sashal@...nel.org>
Subject: Re: [PATCH 4.19 062/114] f2fs: choose hardlimit when softlimit is
 larger than hardlimit in f2fs_statfs_project()

Hi!

> From: Chengguang Xu <cgxu519@...ernel.net>
> 
> [ Upstream commit 909110c060f22e65756659ec6fa957ae75777e00 ]
> 
> Setting softlimit larger than hardlimit seems meaningless
> for disk quota but currently it is allowed. In this case,
> there may be a bit of comfusion for users when they run
> df comamnd to directory which has project quota.
> 
> For example, we set 20M softlimit and 10M hardlimit of
> block usage limit for project quota of test_dir(project id 123).

> Signed-off-by: Chengguang Xu <cgxu519@...ernel.net>
> Reviewed-by: Chao Yu <yuchao0@...wei.com>
> Signed-off-by: Jaegeuk Kim <jaegeuk@...nel.org>
> Signed-off-by: Sasha Levin <sashal@...nel.org>
> ---
>  fs/f2fs/super.c | 20 ++++++++++++++------
>  1 file changed, 14 insertions(+), 6 deletions(-)
> 
> diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
> index 7a9cc64f5ca3..662c7de58b99 100644
> --- a/fs/f2fs/super.c
> +++ b/fs/f2fs/super.c
> @@ -1148,9 +1148,13 @@ static int f2fs_statfs_project(struct super_block *sb,
>  		return PTR_ERR(dquot);
>  	spin_lock(&dquot->dq_dqb_lock);
>  
> -	limit = (dquot->dq_dqb.dqb_bsoftlimit ?
> -		 dquot->dq_dqb.dqb_bsoftlimit :
> -		 dquot->dq_dqb.dqb_bhardlimit) >> sb->s_blocksize_bits;
> +	limit = 0;
> +	if (dquot->dq_dqb.dqb_bsoftlimit)
> +		limit = dquot->dq_dqb.dqb_bsoftlimit;
> +	if (dquot->dq_dqb.dqb_bhardlimit &&
> +			(!limit || dquot->dq_dqb.dqb_bhardlimit < limit))
> +		limit = dquot->dq_dqb.dqb_bhardlimit;
> +
>  	if (limit && buf->f_blocks > limit) {

>> blocksize disappeared here. That can't be right.

Plus, is this just obfuscated way of saying

limit = min_not_zero(dquot->dq_dqb.dqb_bsoftlimit, dquot->dq_dqb.dqb_bhardlimit)?

Best regards,
								Pavel

-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

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