linux-kernel - Re: Device loses barrier support

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Date:	Thu, 04 Dec 2008 21:26:57 -0600
From:	Eric Sandeen <sandeen@...deen.net>
To:	Mikulas Patocka <mpatocka@...hat.com>
CC:	Andi Kleen <andi@...stfloor.org>, Milan Broz <mbroz@...hat.com>,
	Andi Kleen <andi-suse@...stfloor.org>,
	linux-kernel@...r.kernel.org, Alasdair G Kergon <agk@...hat.com>,
	xfs@....sgi.com
Subject: Re: Device loses barrier support

Mikulas Patocka wrote:

> Another thing:
> 
> I'm wondering, where in fsync() does Linux wait for hardware disk cache to 
> be flushed? Isn't there a bug that fsync() will return before the cache is 
> flushed? I couldn't really find it. The last thing do_fsync calls is 
> filemap_fdatawait and it doesn't do cache flush (blkdev_issue_flush).

ext4, reiserfs, and xfs all call blkdev_issue_flush() in their ->fsync
file operations (or down that path).

-Eric
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