Re: [PATCH 4.19 062/114] f2fs: choose hardlimit when softlimit is larger than hardlimit in f2fs_statfs_project()

Pavel Machek
2020-01-03T17:12:20Z

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Hi!

> From: Chengguang Xu <cgxu519@mykernel.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@mykernel.net>
> Reviewed-by: Chao Yu <yuchao0@huawei.com>
> Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
> Signed-off-by: Sasha Levin <sashal@kernel.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

--
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