linux-kernel - Re: [PATCH v11 00/21] Add support for NV-DIMMs to ext4

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Message-ID: <20140930144854.GA5098@wil.cx>
Date:	Tue, 30 Sep 2014 10:48:54 -0400
From:	Matthew Wilcox <willy@...ux.intel.com>
To:	Valdis.Kletnieks@...edu
Cc:	Matthew Wilcox <matthew.r.wilcox@...el.com>,
	linux-fsdevel@...r.kernel.org, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org,
	Matthew Wilcox <willy@...ux.intel.com>
Subject: Re: [PATCH v11 00/21] Add support for NV-DIMMs to ext4

On Tue, Sep 30, 2014 at 05:45:01AM -0400, Valdis.Kletnieks@...edu wrote:
> On Thu, 25 Sep 2014 16:33:17 -0400, Matthew Wilcox said:
> 
> > Patch 19 adds some DAX infrastructure to support ext4.
> >
> > Patch 20 adds DAX support to ext4.  It is broadly similar to ext2's DAX
> > support, but it is more efficient than ext4's due to its support for
> > unwritten extents.
> 
> I don't currently have a use case for NV-DIMM support.
> 
> However, it would be nice if this code could be leveraged to support
> 'force O_DIRECT on all I/O to this file' - that I *do* have a use
> case for.  Patch 20 looks to my untrained eye like it *almost* gets
> there.
> 
> (And if in fact it *does* do the whole enchilada, the Changelog etc should
> mention it :)

No, it doesn't try to do that.  Wouldn't you be better served with an
LD_PRELOAD that forces O_DIRECT on?

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