Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757117AbZDANEN (ORCPT ); Wed, 1 Apr 2009 09:04:13 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1754175AbZDAND6 (ORCPT ); Wed, 1 Apr 2009 09:03:58 -0400 Received: from hera.kernel.org ([140.211.167.34]:56574 "EHLO hera.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753016AbZDAND5 (ORCPT ); Wed, 1 Apr 2009 09:03:57 -0400 Message-ID: <49D3662B.3000801@kernel.org> Date: Wed, 01 Apr 2009 22:03:39 +0900 From: Tejun Heo User-Agent: Thunderbird 2.0.0.19 (X11/20081227) MIME-Version: 1.0 To: FUJITA Tomonori CC: axboe@kernel.dk, bharrosh@panasas.com, linux-kernel@vger.kernel.org, tj@kenel.org Subject: Re: [PATCH 8/8] blk-map: reimplement blk_rq_map_user() using blk_rq_map_user_iov() References: <1238583884-13517-9-git-send-email-tj@kernel.org> <20090401214415W.fujita.tomonori@lab.ntt.co.jp> <49D36329.20004@kernel.org> <20090401215933S.fujita.tomonori@lab.ntt.co.jp> In-Reply-To: <20090401215933S.fujita.tomonori@lab.ntt.co.jp> X-Enigmail-Version: 0.95.7 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.0 (hera.kernel.org [127.0.0.1]); Wed, 01 Apr 2009 13:03:43 +0000 (UTC) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 880 Lines: 22 FUJITA Tomonori wrote: > No, we are not talking about blk_rq_append_bio(). > > We are talking about the multiple bio handling in blk_rq_map_user, > which is the feature that Mike added long time ago. The feature is > surely necessary for some users. So you can't remote it. How would someone use that without blk_rq_append_bio()? The only reason blk_rq_map_user() had multiple bio chaining was to work around BIO_MAX_SIZE. blk_rq_map_user_iov() doesn't support multiple bio chaining, so sans blk_rq_append_bio() or playing with rq/bio internals directly, there's no way to use or even know about multiple bios. Thanks. -- tejun -- 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/