linux-kernel - Re: [f2fs-dev] [PATCH 3/3 v2] f2fs: clean up /sys/fs/f2fs/<disk>/features

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Message-ID: <YL5QLFl4RKpL/vAR@google.com>
Date:   Mon, 7 Jun 2021 09:58:20 -0700
From:   Jaegeuk Kim <jaegeuk@...nel.org>
To:     Chao Yu <chao@...nel.org>
Cc:     linux-kernel@...r.kernel.org,
        linux-f2fs-devel@...ts.sourceforge.net
Subject: Re: [f2fs-dev] [PATCH 3/3 v2] f2fs: clean up
 /sys/fs/f2fs/<disk>/features

On 06/07, Chao Yu wrote:
> On 2021/6/6 13:36, Jaegeuk Kim wrote:
> > Let's create /sys/fs/f2fs/<disk>/feature_list/ to meet sysfs rule.
> > 
> > Note that there are three feature list entries:
> > 1) /sys/fs/f2fs/features
> >    : shows runtime features supported by in-kernel f2fs along with Kconfig.
> >      - ref. F2FS_FEATURE_RO_ATTR()
> > 
> > 2) /sys/fs/f2fs/$s_id/features <deprecated>
> >    : shows on-disk features enabled by mkfs.f2fs, used for old kernels. This
> >      won't add new feature anymore, and thus, users should check entries in 3)
> >      instead of this 2).
> > 
> > 3) /sys/fs/f2fs/$s_id/feature_list
> >    : shows on-disk features enabled by mkfs.f2fs per instance, which follows
> >      sysfs entry rule where each entry should expose single value.
> >      This list covers old feature list provided by 2) and beyond. Therefore,
> >      please add new on-disk feature in this list only.
> >      - ref. F2FS_SB_FEATURE_RO_ATTR()
> > 
> > Signed-off-by: Jaegeuk Kim <jaegeuk@...nel.org>
> 
> Reviewed-by: Chao Yu <yuchao0@...wei.com>
> 
> > +static struct kobj_type f2fs_feature_list_ktype = {
> > +	.default_groups = f2fs_sb_feat_groups,
> > +	.sysfs_ops	= &f2fs_feature_list_attr_ops,
> > +	.release	= f2fs_feature_list_kobj_release,
> > +};
> > +
> > +
> 
> Nitpick, one redundant blank line.

Done.

> 
> Thanks,