linux-ext4 - Re: [PATCH] ext4: introduce per-inode DAX flag

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Message-ID: <20170825154032.GA1827@infradead.org>
Date:   Fri, 25 Aug 2017 08:40:32 -0700
From:   Christoph Hellwig <hch@...radead.org>
To:     Theodore Ts'o <tytso@....edu>
Cc:     Christoph Hellwig <hch@...radead.org>, linux-ext4@...r.kernel.org,
        Lukas Czerner <lczerner@...hat.com>, linux-xfs@...r.kernel.org
Subject: Re: [PATCH] ext4: introduce per-inode DAX flag

On Fri, Aug 25, 2017 at 11:14:45AM -0400, Theodore Ts'o wrote:
> > I don't know of anyone that actually uses the flag.  If someone did
> > that would probably run into problems like changing that changing it
> > on a file that's currently mmaped would crash an burn badly.
> 
> Crash and burn meaning the *kernel* will crash and burn?  Or will data
> be damaged?
> 
> Given that, maybe XFS should withdraw support for the DAX and hope no
> one is actually using it?

Nah, -o dax works very well.  It's just the flag instead of the -o dax
option or rather switching it on a mapped file will probably be very dangerous.

> 
> 					- Ted
> 
> 
> 
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