linux-kernel - Re: [PATCH 4/4] ext4: call blkdev_issue

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Message-ID: <20080520023454.GM15035@mit.edu>
Date:	Mon, 19 May 2008 22:34:55 -0400
From:	Theodore Tso <tytso@....EDU>
To:	Eric Sandeen <sandeen@...hat.com>
Cc:	ext4 development <linux-ext4@...r.kernel.org>,
	linux-kernel Mailing List <linux-kernel@...r.kernel.org>,
	linux-fsdevel <linux-fsdevel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Jamie Lokier <jamie@...reable.org>
Subject: Re: [PATCH 4/4] ext4: call blkdev_issue_flush on fsync

On Fri, May 16, 2008 at 02:09:56PM -0500, Eric Sandeen wrote:
> To ensure that bits are truly on-disk after an fsync,
> we should call blkdev_issue_flush if barriers are supported.

This patch isn't necessary, and in fact will cause a double flush.
When you call fsync(), it calls ext4_force_commit(), and we do a the
equivalent of a blkdev_issue_flush() today (which is what happenes
when you do a submit_bh(WRITE_BARRIER, bh), which is what setting
set_ordered_mode(bh) ends up causing.

						- Ted
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