linux-ext4 - fallocate vs O

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Message-ID: <20111116084256.GA22963@infradead.org>
Date:	Wed, 16 Nov 2011 03:42:56 -0500
From:	Christoph Hellwig <hch@...radead.org>
To:	linux-btrfs@...r.kernel.org, linux-ext4@...r.kernel.org,
	mfasheh@...e.com, jlbec@...lplan.org, cluster-devel@...hat.com
Subject: fallocate vs O_(D)SYNC

It seems all filesystems but XFS ignore O_SYNC for fallocate, and never
make sure the size update transaction made it to disk.

Given that a fallocate without FALLOC_FL_KEEP_SIZE very much is a data
operation (it adds new blocks that return zeroes) that seems like a
fairly nasty surprise for O_SYNC users.
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