linux-ext4 - per inode fsync optimization question

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Message-ID: <8738v7r8xx.fsf@openvz.org>
Date:	Wed, 03 Apr 2013 18:21:46 +0400
From:	Dmitry Monakhov <dmonakhov@...nvz.org>
To:	ext4 development <linux-ext4@...r.kernel.org>,
	Jan Kara <jack@...e.cz>
Subject: per inode fsync optimization question

inode store i_sync_tid and i_datasync_tid  in order to optimize journal
flushes and wait for commits only when necessary, but
fields are declared as tid_t(not atomic_t as it done in ext3) so we
have not synchronization between readers and writers, so gcc and cpu
is allowed to perform prefetch, cache and other stuff.
Looks like a bug, right?

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