linux-kernel - Re: [PATCH] ubifs: Add freeze support

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Message-ID: <CAOQ4uxgdTnDY2Vpo0S+oyZkFN37GX-G=om3qATwtC1WF1g_NDw@mail.gmail.com>
Date:   Mon, 29 May 2017 08:40:11 +0300
From:   Amir Goldstein <amir73il@...il.com>
To:     Hyunchul Lee <hyc.lee@...il.com>
Cc:     Richard Weinberger <richard@....at>,
        Artem Bityutskiy <dedekind1@...il.com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        linux-kernel <linux-kernel@...r.kernel.org>, kernel-team@....com,
        linux-mtd@...ts.infradead.org,
        linux-fsdevel <linux-fsdevel@...r.kernel.org>
Subject: Re: [PATCH] ubifs: Add freeze support

On Mon, May 29, 2017 at 7:40 AM, Hyunchul Lee <hyc.lee@...il.com> wrote:
>
> and I missed the following case.
>
> in some embedded systems, clean-up for shutdown should be fast.
> during this clean-up, freeze file system to guarantee integrity.
> umount with MNT_DETACH is not suitable because of not killing tasks.
>

Interesting point. It seems that good old "sync; reboot" does not cut
it anymore.
Not even emergency remount read-only sysrq trigger.

Some of you may have been following this thread on fsdevel:
https://www.spinics.net/lists/linux-xfs/msg06953.html

Probably less have been following this longer thread on xfs list:
https://www.spinics.net/lists/linux-xfs/msg06883.html