From: Christoph Hellwig <hch@infradead.org>
Subject: Re: [PATCH v2 2/9] ext2: tell DAX the size of allocation holes
Date: Sat, 10 Sep 2016 00:42:28 -0700
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Cc: Christoph Hellwig <hch@infradead.org>,
	Ross Zwisler <ross.zwisler@linux.intel.com>,
	Theodore Ts'o <tytso@mit.edu>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	Andrew Morton <akpm@linux-foundation.org>,
	"linux-nvdimm@ml01.01.org" <linux-nvdimm@ml01.01.org>,
	Dave Chinner <david@fromorbit.com>,
	"linux-mm@kvack.org" <linux-mm@kvack.org>,
	Andreas Dilger <adilger.kernel@dilger.ca>,
	Alexander Viro <viro@zeniv.linux.org.uk>, Jan Kara <jack@suse.com>,
	"linux-fsdevel@vger.kernel.org" <linux-fsdevel@vger.kernel.org>,
	"linux-ext4@vger.kernel.org" <linux-ext4@vger.kernel.org>
To: Matthew Wilcox <mawilcox@microsoft.com>
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On Sat, Sep 10, 2016 at 07:33:18AM +0000, Matthew Wilcox wrote:
> > caller specific is unaceptable.  That being said your idea doesn't sounds
> > unreasonable, but will require a bit more work and has no real short-term
> > need.
> 
> So your proposal is to remove buffer_heads from ext2?

No, the proposal is to remove buffer_heads from XFS first, then GFS2
and then maybe others like ext4.  I'd like to remove buffer_heads from
the DAX path for ext2 and ext4 entitrely for sure (and direct I/O next).

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