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

To: Dave Chinner <david@xxxxxxxxxxxxx>
Subject: Re: + ext4-add-dax-functionality.patch added to -mm tree
From: "hch@xxxxxx" <hch@xxxxxx>
Date: Wed, 18 Feb 2015 22:59:22 +0100
Cc: Jan Kara <jack@xxxxxxx>, Matthew Wilcox <willy@xxxxxxxxxxxxxxx>, "Wilcox, Matthew R" <matthew.r.wilcox@xxxxxxxxx>, "ross.zwisler@xxxxxxxxxxxxxxx" <ross.zwisler@xxxxxxxxxxxxxxx>, "akpm@xxxxxxxxxxxxxxxxxxxx" <akpm@xxxxxxxxxxxxxxxxxxxx>, "Dilger, Andreas" <andreas.dilger@xxxxxxxxx>, "axboe@xxxxxxxxx" <axboe@xxxxxxxxx>, "boaz@xxxxxxxxxxxxx" <boaz@xxxxxxxxxxxxx>, "hch@xxxxxx" <hch@xxxxxx>, "kirill.shutemov@xxxxxxxxxxxxxxx" <kirill.shutemov@xxxxxxxxxxxxxxx>, "mathieu.desnoyers@xxxxxxxxxxxx" <mathieu.desnoyers@xxxxxxxxxxxx>, "rdunlap@xxxxxxxxxxxxx" <rdunlap@xxxxxxxxxxxxx>, "tytso@xxxxxxx" <tytso@xxxxxxx>, "mm-commits@xxxxxxxxxxxxxxx" <mm-commits@xxxxxxxxxxxxxxx>, "linux-ext4@xxxxxxxxxxxxxxx" <linux-ext4@xxxxxxxxxxxxxxx>, xfs@xxxxxxxxxxx
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In-reply-to: <20150218215523.GO12722@dastard>
References: <54b45495.+RptMlNQorYE9TTf%akpm@xxxxxxxxxxxxxxxxxxxx> <20150115124106.GF12739@xxxxxxxxxxxxx> <100D68C7BA14664A8938383216E40DE040853440@xxxxxxxxxxxxxxxxxxxxxxxxxxxx> <20150119141858.GF5662@xxxxxxxxxxxxx> <20150217085200.GA23192@xxxxxxxxxxxxx> <20150217133745.GG3364@xxxxxx> <20150218104009.GB4614@xxxxxxxxxxxxx> <20150218215523.GO12722@dastard>
User-agent: Mutt/1.5.17 (2007-11-01)
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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