Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757443AbYLDRxY (ORCPT ); Thu, 4 Dec 2008 12:53:24 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1754846AbYLDRxO (ORCPT ); Thu, 4 Dec 2008 12:53:14 -0500 Received: from bombadil.infradead.org ([18.85.46.34]:57288 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754844AbYLDRxO (ORCPT ); Thu, 4 Dec 2008 12:53:14 -0500 Date: Thu, 4 Dec 2008 12:53:07 -0500 From: Christoph Hellwig To: Andi Kleen Cc: Mikulas Patocka , Andi Kleen , linux-kernel@vger.kernel.org, xfs@oss.sgi.com, Alasdair G Kergon , Milan Broz Subject: Re: Device loses barrier support (was: Fixed patch for simple barriers.) Message-ID: <20081204175306.GA24196@infradead.org> References: <20081204100050.GN6703@one.firstfloor.org> <20081204142015.GQ6703@one.firstfloor.org> <20081204145810.GR6703@one.firstfloor.org> <20081204174838.GS6703@one.firstfloor.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20081204174838.GS6703@one.firstfloor.org> User-Agent: Mutt/1.5.18 (2008-05-17) X-SRS-Rewrite: SMTP reverse-path rewritten from by bombadil.infradead.org See http://www.infradead.org/rpr.html Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 648 Lines: 14 On Thu, Dec 04, 2008 at 06:48:38PM +0100, Andi Kleen wrote: > I think. Just the low level xfs_buf interface happens to use the asynchronous > callbacks instead of calling into the block layer directly like jbd et.al. > do. Only delwri buffers are delayed in XFS, but the journaling code only uses async buffers which *synchronously* call into the block layer, but just don't wait for it to complete.. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/