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Date:   Mon, 29 May 2017 10:18:34 +0900
From:   Hyunchul Lee <hyc.lee@...il.com>
To:     Richard Weinberger <richard@....at>
Cc:     Artem Bityutskiy <dedekind1@...il.com>,
        linux-kernel@...r.kernel.org, adrian.hunter@...el.com,
        kernel-team@....com, linux-mtd@...ts.infradead.org,
        linux-fsdevel@...r.kernel.org
Subject: Re: [PATCH] ubifs: Add freeze support

Hi, Richard.

On Fri, May 26, 2017 at 11:52:42AM +0200, Richard Weinberger wrote:
> Hyunchul,
> 
> Am 26.05.2017 um 01:30 schrieb Hyunchul Lee:
> > From: Hyunchul Lee <cheol.lee@....com>
> > 
> > for un/freeze support, implement freeze_super and un/freeze_fs
> > of super_operations.
> > ubifs_freeze_super just calls freeze_super. because freeze_super always
> > succeeds if file system is read-only,  UBIFS errors should be checked.
> > if there are errors, UBIFS is switched to read-only mode.
> > ubifs_freeze_fs runs commit if TNC/LPT isn't clean. though all writes
> > are blocked and sync_fs is called before, if commit alreay was started
> > before writes are blocked, TNC/LPT might have dirty COW nodes.
> 
> you explain how you implement that feature, but not why.
> What is the use-case?
> I always thought this interface is only being used by LVM.

Sorry, I forgot this. I implement this to make a backup of some files, and
support fsfreeze utility and SysRq's freeze/thaw commmand.

> 
> Thanks,
> //richard
> 
> ______________________________________________________
> Linux MTD discussion mailing list
> http://lists.infradead.org/mailman/listinfo/linux-mtd/

-- 

Thanks,
Hyunchul

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