linux-ext4 - Fallocate and DirectIO

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Message-ID: <20090612123112.GB25239@skywalker>
Date:	Fri, 12 Jun 2009 18:01:12 +0530
From:	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>
To:	"linux-ext4@...r.kernel.org" <linux-ext4@...r.kernel.org>,
	Theodore Tso <tytso@....edu>,
	Eric Sandeen <sandeen@...hat.com>,
	Andreas Dilger <adilger@....com>
Subject: Fallocate and DirectIO

Hi,

I noticed yesterday that a write to fallocate
space via directIO results in fallback to buffer_IO. ie the userspace
pages get copied to the page cache and then call a sync.

I guess this defeat the purpose of using directIO. May be we should
consider this a high priority bug.

-aneesh
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