Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1765403AbZFQJUR (ORCPT ); Wed, 17 Jun 2009 05:20:17 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1755888AbZFQJUE (ORCPT ); Wed, 17 Jun 2009 05:20:04 -0400 Received: from hera.kernel.org ([140.211.167.34]:40702 "EHLO hera.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1758092AbZFQJUD (ORCPT ); Wed, 17 Jun 2009 05:20:03 -0400 Message-ID: <4A38B52A.5040304@kernel.org> Date: Wed, 17 Jun 2009 18:19:38 +0900 From: Tejun Heo User-Agent: Thunderbird 2.0.0.19 (X11/20081227) MIME-Version: 1.0 To: Boaz Harrosh CC: Kiyoshi Ueda , Jens Axboe , linux-kernel@vger.kernel.org, device-mapper development , "Jun'ichi Nomura" Subject: Re: [PATCH block#for-2.6.31] block: add request clone interface References: <4A2E1490.7060902@ct.jp.nec.com> <20090609180344.GQ11363@kernel.dk> <4A2F1741.8090100@ct.jp.nec.com> <4A2F66ED.80206@panasas.com> In-Reply-To: <4A2F66ED.80206@panasas.com> X-Enigmail-Version: 0.95.7 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.0 (hera.kernel.org [127.0.0.1]); Wed, 17 Jun 2009 09:19:42 +0000 (UTC) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 651 Lines: 22 Hello, Boaz. Boaz Harrosh wrote: > dst->buffer is always NULL in my path so I don't know > what that is. Tejun? Sorry about late reply. It points to the head of the data buffer (bio) if the address is in addressable range (actually gets bogus value if not) and is used mostly by PIO-only drivers. It's set in blk_rq_bio_prep(), gets updated on merge and partial request completion. 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/