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

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Message-ID: <CACOAw_y23emnXdmbUJT_QDdF42EGJ9p4-ZuC9caJBGTpLWbR=g@mail.gmail.com>
Date:   Fri, 3 Jul 2020 11:46:42 +0900
From:   Daeho Jeong <daeho43@...il.com>
To:     Chao Yu <yuchao0@...wei.com>
Cc:     linux-kernel@...r.kernel.org,
        linux-f2fs-devel@...ts.sourceforge.net, kernel-team@...roid.com,
        Daeho Jeong <daehojeong@...gle.com>
Subject: Re: [f2fs-dev] [PATCH] f2fs: add symbolic link to kobject in sysfs

Got it.

Thanks~

2020년 7월 3일 (금) 오전 11:02, Chao Yu <yuchao0@...wei.com>님이 작성:
>
> On 2020/7/1 20:12, Daeho Jeong wrote:
> >> On 2020/7/1 15:04, Daeho Jeong wrote:
> >>> Actually, I want to keep the mount number remaining to the same
> >>> number, even if it's re-mounted.
> >>
> >> Then once there is f2fs umounter, the order will be incorrect...
> >
> > Actually, we prepared this patch for a strictly controlled system like
> > Android to easily access the sysfs node for a specific partition like
> > userdata partition using a specific number.
>
> I'm not against Android defined interfaces, just be confused about the
> behavior that does not fully documented (at least, we should add this
> into f2fs doc, and specify this is android specified interface), something
> like once one mount point was umounted, that sequential number @x in
> 'mount_@x" could be reused by later newly mounted point, it breaks the
> description: "in the order of mounting filesystem".
>
> > In this system, we don't worry about another unexpected f2fs umounter
> > interfering in between unmounting and mounting a partition.
> >
> > When we are under the condition that we can keep track of how many
> > times the userdata partition has been re-mounted, we might as well use
> > the original partition name like "/sys/fs/f2fs/dm-9".
> > This is for when we couldn't do that.
> > .
> >