linux-ext4 - Re: [PATCH 3/9] xfs: factor out everything but the filemap_write_and_wait from xfs_file

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Message-ID: <20121121100913.GF23339@infradead.org>
Date:	Wed, 21 Nov 2012 05:09:13 -0500
From:	Christoph Hellwig <hch@...radead.org>
To:	"Darrick J. Wong" <darrick.wong@...cle.com>
Cc:	axboe@...nel.dk, tytso@....edu, david@...morbit.com,
	jmoyer@...hat.com, bpm@....com, viro@...iv.linux.org.uk,
	jack@...e.cz, linux-fsdevel@...r.kernel.org, hch@...radead.org,
	linux-ext4@...r.kernel.org, linux-kernel@...r.kernel.org,
	xfs@....sgi.com
Subject: Re: [PATCH 3/9] xfs: factor out everything but the
 filemap_write_and_wait from xfs_file_fsync

On Mon, Nov 19, 2012 at 11:41:38PM -0800, Darrick J. Wong wrote:
> Hi,
> 
> Fsyncing is tricky business, so factor out the bits of the xfs_file_fsync
> function that can be used from the I/O post-processing path.

Why would we need to skip the filemap_write_and_wait_range call here?
If we're doing direct I/O we should not have any pages in this regions
anyway.  You're also not skipping it in the generic implementation as
far as I can see, so I see no point in doing it just in XFS.
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