From mboxrd@z Thu Jan  1 00:00:00 1970
From: Christoph Hellwig <hch@infradead.org>
Subject: Re: [PATCH v2] Do a proper locking for mmap and block size change
Date: Fri, 30 Nov 2012 18:09:00 -0500
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Cc: Christoph Hellwig <hch@infradead.org>,
	Linus Torvalds <torvalds@linux-foundation.org>,
	Chris Mason <chris.mason@fusionio.com>,
	Chris Mason <clmason@fusionio.com>,
	Mikulas Patocka <mpatocka@redhat.com>,
	Al Viro <viro@zeniv.linux.org.uk>,
	Jens Axboe <axboe@kernel.dk>,
	Jeff Chua <jeff.chua.linux@gmail.com>,
	Lai Jiangshan <laijs@cn.fujitsu.com>, Jan Kara <jack@suse.cz>,
	lkml <linux-kernel@vger.kernel.org>,
	linux-fsdevel <linux-fsdevel@vger.kernel.org>
To: Dave Chinner <david@fromorbit.com>
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On Sat, Dec 01, 2012 at 09:40:41AM +1100, Dave Chinner wrote:
> So it was based on this interface?

Based on that.  I had dropped the inode operation as it's not really
a generic operation but a callback for either the buffered I/O code
or direct I/O and should be treated as such.  I've also split the
single multiplexer function into individual ones, but the underlying
data structure and fundamental operations are the same.

> (I went looking for this code on google a couple of days ago so I
> could point at it and say "we should be using an iomap structure,
> not buffer heads", but it looks like I never posted it to fsdevel or
> the xfs lists...)

Your version defintively was up on your kernel.org XFS tree, that's what
I started from.

I'll have a long plane right tonight, let's see if I can get the direct
I/O version updated.