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Message-ID: <20160524085343.GC8121@infradead.org>
Date:	Tue, 24 May 2016 01:53:43 -0700
From:	Christoph Hellwig <hch@...radead.org>
To:	Jaegeuk Kim <jaegeuk@...nel.org>
Cc:	Viacheslav Dubeyko <slava@...eyko.com>,
	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	linux-f2fs-devel@...ts.sourceforge.net,
	Vyacheslav.Dubeyko@...t.com, Cyril.Guyot@...t.com,
	Adam.Manzanares@...t.com, Damien.LeMoal@...t.com
Subject: Re: [PATCH] f2fs: introduce on-disk layout version checking
 functionality

On Mon, May 23, 2016 at 02:13:57PM -0700, Jaegeuk Kim wrote:
> As Christoph mentioned, how about checking the feature only like this?
> 
> 1. if the feature is ON,
>  - go 64 bits   , when compiled w/  F2FS_MIN_16TB_VOLUME_SUPPORT
>  - fail to mount, when compiled w/o F2FS_MIN_16TB_VOLUME_SUPPORT
> 
> 2. if the feature is OFF,
>  - fail to mount, when compiled w/  F2FS_MIN_16TB_VOLUME_SUPPORT
>  - go 32 bits   , when compiled w/o F2FS_MIN_16TB_VOLUME_SUPPORT
> 
> Thoughts?

That goes on to the next question: why do we even need a config option
for 16TB+ volume support?

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