From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1764315AbZE1Uf3 (ORCPT ); Thu, 28 May 2009 16:35:29 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1758354AbZE1UfU (ORCPT ); Thu, 28 May 2009 16:35:20 -0400 Received: from bombadil.infradead.org ([18.85.46.34]:58148 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757899AbZE1UfT (ORCPT ); Thu, 28 May 2009 16:35:19 -0400 Subject: Re: [PATCH 0/11] Per-bdi writeback flusher threads v9 From: Peter Zijlstra To: Artem Bityutskiy Cc: Jens Axboe , linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org, tytso@mit.edu, chris.mason@oracle.com, david@fromorbit.com, hch@infradead.org, akpm@linux-foundation.org, jack@suse.cz, yanmin_zhang@linux.intel.com, richard@rsk.demon.co.uk, damien.wyart@free.fr In-Reply-To: <4A1E9D8B.8020908@gmail.com> References: <1243511204-2328-1-git-send-email-jens.axboe@oracle.com> <4A1E9D0B.4090402@gmail.com> <4A1E9D8B.8020908@gmail.com> Content-Type: text/plain Date: Thu, 28 May 2009 22:35:08 +0200 Message-Id: <1243542908.6645.104.camel@laptop> Mime-Version: 1.0 X-Mailer: Evolution 2.26.1 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, 2009-05-28 at 17:19 +0300, Artem Bityutskiy wrote: > Artem Bityutskiy wrote: > > question is - should it? 'bdi_register()' a block device, > > but we do not have one. > > Sorry, wanted to say: 'bdi_register()' registers a block > device. BDI stands for backing device info and is not related to block devices other than that block devices can also be (ok, always are) backing devices. If you want to do writeback, you need a backing device to write to. The BDI is the device abstraction for writeback.