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Date: Wed, 18 Feb 2015 22:59:22 +0100
From: "hch@lst.de" <hch@lst.de>
Subject: Re: + ext4-add-dax-functionality.patch added to -mm tree
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To: Dave Chinner <david@fromorbit.com>
Cc: "axboe@kernel.dk" <axboe@kernel.dk>, "boaz@plexistor.com" <boaz@plexistor.com>, xfs@oss.sgi.com, Jan Kara <jack@suse.cz>, "rdunlap@infradead.org" <rdunlap@infradead.org>, "tytso@mit.edu" <tytso@mit.edu>, "hch@lst.de" <hch@lst.de>, "mathieu.desnoyers@efficios.com" <mathieu.desnoyers@efficios.com>, "Wilcox, Matthew R" <matthew.r.wilcox@intel.com>, "mm-commits@vger.kernel.org" <mm-commits@vger.kernel.org>, "Dilger, Andreas" <andreas.dilger@intel.com>, Matthew Wilcox <willy@linux.intel.com>, "ross.zwisler@linux.intel.com" <ross.zwisler@linux.intel.com>, "linux-ext4@vger.kernel.org" <linux-ext4@vger.kernel.org>, "akpm@linux-foundation.org" <akpm@linux-foundation.org>, "kirill.shutemov@linux.intel.com" <kirill.shutemov@linux.intel.com>

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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