Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753493AbZIUTng (ORCPT ); Mon, 21 Sep 2009 15:43:36 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1753359AbZIUTnf (ORCPT ); Mon, 21 Sep 2009 15:43:35 -0400 Received: from acsinet12.oracle.com ([141.146.126.234]:35889 "EHLO acsinet12.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752117AbZIUTne (ORCPT ); Mon, 21 Sep 2009 15:43:34 -0400 To: device-mapper development Cc: Jens Axboe , "Martin K. Petersen" , Mike Snitzer , Alasdair G Kergon , linux-kernel@vger.kernel.org Subject: Re: [dm-devel] [PATCH 1/3] block: Add blk_queue_copy_limits() From: "Martin K. Petersen" Organization: Oracle References: <4AB3B43D.9000802@ce.jp.nec.com> <4AB4F74E.7000908@ce.jp.nec.com> <4AB7AAE2.8000404@ce.jp.nec.com> Date: Mon, 21 Sep 2009 15:43:19 -0400 In-Reply-To: <4AB7AAE2.8000404@ce.jp.nec.com> (Jun'ichi Nomura's message of "Tue, 22 Sep 2009 01:33:38 +0900") Message-ID: User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/23.1 (gnu/linux) MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii X-Source-IP: abhmt013.oracle.com [141.146.116.22] X-Auth-Type: Internal IP X-CT-RefId: str=0001.0A090201.4AB7D75A.00F3:SCFSTAT5015188,ss=1,fgs=0 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1517 Lines: 39 >>>>> "Jun'ichi" == Jun'ichi Nomura writes: Jun'ichi> If we aren't sure, shouldn't we set its default to -1 or Jun'ichi> putting comments in blk_set_default_limits() at least to avoid Jun'ichi> possible confusion in future? Jens, what do you think about this? Goes on top of what you have queued... block: Do not clamp max_hw_sectors for stacking devices Stacking devices do not have an inherent max_hw_sector limit. Set the default to INT_MAX so we are bounded only by capabilities of the underlying storage. Signed-off-by: Martin K. Petersen --- diff --git a/block/blk-settings.c b/block/blk-settings.c index cd9b730..eaf122f 100644 --- a/block/blk-settings.c +++ b/block/blk-settings.c @@ -111,7 +111,8 @@ void blk_set_default_limits(struct queue_limits *lim) lim->max_hw_segments = MAX_HW_SEGMENTS; lim->seg_boundary_mask = BLK_SEG_BOUNDARY_MASK; lim->max_segment_size = MAX_SEGMENT_SIZE; - lim->max_sectors = lim->max_hw_sectors = BLK_DEF_MAX_SECTORS; + lim->max_sectors = BLK_DEF_MAX_SECTORS; + lim->max_hw_sectors = INT_MAX; lim->logical_block_size = lim->physical_block_size = lim->io_min = 512; lim->bounce_pfn = (unsigned long)(BLK_BOUNCE_ANY >> PAGE_SHIFT); lim->alignment_offset = 0; -- 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/