linux-ext4 - Re: + ext4-add-dax-functionality.patch added to -mm tree

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Message-ID: <20150218215922.GA2285@lst.de>
Date:	Wed, 18 Feb 2015 22:59:22 +0100
From:	"hch@....de" <hch@....de>
To:	Dave Chinner <david@...morbit.com>
Cc:	Jan Kara <jack@...e.cz>, Matthew Wilcox <willy@...ux.intel.com>,
	"Wilcox, Matthew R" <matthew.r.wilcox@...el.com>,
	"ross.zwisler@...ux.intel.com" <ross.zwisler@...ux.intel.com>,
	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
	"Dilger, Andreas" <andreas.dilger@...el.com>,
	"axboe@...nel.dk" <axboe@...nel.dk>,
	"boaz@...xistor.com" <boaz@...xistor.com>,
	"hch@....de" <hch@....de>,
	"kirill.shutemov@...ux.intel.com" <kirill.shutemov@...ux.intel.com>,
	"mathieu.desnoyers@...icios.com" <mathieu.desnoyers@...icios.com>,
	"rdunlap@...radead.org" <rdunlap@...radead.org>,
	"tytso@....edu" <tytso@....edu>,
	"mm-commits@...r.kernel.org" <mm-commits@...r.kernel.org>,
	"linux-ext4@...r.kernel.org" <linux-ext4@...r.kernel.org>,
	xfs@....sgi.com
Subject: Re: + ext4-add-dax-functionality.patch added to -mm tree

On Thu, Feb 19, 2015 at 08:55:23AM +1100, Dave Chinner wrote:
> And speaking of phony BHs, the pnfs block layout changes introduce
> an struct iomap and a "map_blocks" method to the export_ops in
> exportfs.h. This is the model what we should be using instead of
> phony BHs for block mapping/allocation operations...

I've got some WIP patches to move the direct I/O code over to that,
DAX would be another natural fit.
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