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

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Message-ID: <15705.1412070301@turing-police.cc.vt.edu>
Date:	Tue, 30 Sep 2014 05:45:01 -0400
From:	Valdis.Kletnieks@...edu
To:	Matthew Wilcox <matthew.r.wilcox@...el.com>
Cc:	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 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 :)


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