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Date: Thu, 25 Aug 2016 00:57:28 -0700
From: Christoph Hellwig <hch@infradead.org>
Subject: Re: [PATCH v2 2/9] ext2: tell DAX the size of allocation holes
Message-ID: <20160825075728.GA11235@infradead.org>
References: <20160823220419.11717-1-ross.zwisler@linux.intel.com>
 <20160823220419.11717-3-ross.zwisler@linux.intel.com>
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In-Reply-To: <20160823220419.11717-3-ross.zwisler@linux.intel.com>
Sender: owner-linux-mm@kvack.org
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To: Ross Zwisler <ross.zwisler@linux.intel.com>
Cc: linux-kernel@vger.kernel.org, Theodore Ts'o <tytso@mit.edu>, Andrew Morton <akpm@linux-foundation.org>, linux-nvdimm@ml01.01.org, Matthew Wilcox <mawilcox@microsoft.com>, Dave Chinner <david@fromorbit.com>, 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-ext4@vger.kernel.org

Hi Ross,

can you take at my (fully working, but not fully cleaned up) version
of the iomap based DAX code here:

http://git.infradead.org/users/hch/vfs.git/shortlog/refs/heads/iomap-dax

By using iomap we don't even have the size hole problem and totally
get out of the reverse-engineer what buffer_heads are trying to tell
us business.  It also gets rid of the other warts of the DAX path
due to pretending to be like direct I/O, so this might be a better
way forward also for ext2/4.

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