linux-ext4 - Re: [PATCH 2/4 v2] avoid perform unwritten convertion for direct IO over non fallocated space

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Message-ID: <20091104021026.GG6510@mit.edu>
Date:	Tue, 3 Nov 2009 21:10:26 -0500
From:	Theodore Tso <tytso@....edu>
To:	Mingming <cmm@...ibm.com>
Cc:	Curt Wohlgemuth <curtw@...gle.com>,
	ext4 development <linux-ext4@...r.kernel.org>
Subject: Re: [PATCH 2/4 v2] avoid perform unwritten convertion for direct
	IO over non fallocated space

I fixed up some white space issues, and rewrote the patch description
as follows:

ext4: skip conversion of uninit extents after direct IO if there isn't any

At the end of direct I/O operation, ext4_ext_direct_IO() always called
ext4_convert_unwritten_extents(), regardless of whether there were any
unwritten extents involved in the I/O or not.

This commit adds a state flag so that ext4_ext_direct_IO() only calls
ext4_convert_unwritten_extents() when necessary.

Signed-off-by: Mingming Cao <cmm@...ibm.com>
Signed-off-by: "Theodore Ts'o" <tytso@....edu>

Added to the patch queue.

						- Ted
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