linux-kernel - Re: [PATCH v3] f2fs: add symbolic link to kobject in sysfs

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Message-ID: <CACOAw_yweR--34vBXBV07xEGxGhO2r9o_XYVw6h9dMP=C6zp5Q@mail.gmail.com>
Date:   Mon, 6 Jul 2020 08:47:07 +0900
From:   Daeho Jeong <daeho43@...il.com>
To:     Greg KH <gregkh@...uxfoundation.org>
Cc:     linux-kernel@...r.kernel.org,
        linux-f2fs-devel@...ts.sourceforge.net, kernel-team@...roid.com,
        Daeho Jeong <daehojeong@...gle.com>
Subject: Re: [PATCH v3] f2fs: add symbolic link to kobject in sysfs

> No Documentation/ABI/ entry for your new sysfs file/link?

This is for adding a symbolic link to a pre-existed
/sys/fs/f2fs/<disk> directory and it means /sys/fs/f2fs/<mount> points
to /sys/fs/f2fs/<disk>. I already added the description of this in
Documentation/filesystems/f2fs.rst.

>
> And what does this help with?

Some system daemons in Android access with the pre-defined sysfs entry
name in the json file. So whenever the project changes and the
partition layout is changed, we have to follow up the changes and
modify /sys/fs/f2fs/<disk> name in the json file accordingly.

This will help them access all the f2fs sysfs entries consistently
without requiring to know those changes.

>
> If it's really needed, why don't we do this for all filesystem types?

This is for the daemon to change the mode of only F2FS with the power
hint of Android.

>
> thanks,
>
> greg k-h