From patchwork Thu Jul 16 01:13:46 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Martin K. Petersen" X-Patchwork-Id: 6801321 Return-Path: X-Original-To: patchwork-linux-scsi@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork1.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork1.web.kernel.org (Postfix) with ESMTP id 42BAE9F2F0 for ; Thu, 16 Jul 2015 01:14:24 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 57DF4205D1 for ; Thu, 16 Jul 2015 01:14:23 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 0961C20555 for ; Thu, 16 Jul 2015 01:14:22 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753364AbbGPBOT (ORCPT ); Wed, 15 Jul 2015 21:14:19 -0400 Received: from aserp1040.oracle.com ([141.146.126.69]:36932 "EHLO aserp1040.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753609AbbGPBN6 (ORCPT ); Wed, 15 Jul 2015 21:13:58 -0400 Received: from aserv0022.oracle.com (aserv0022.oracle.com [141.146.126.234]) by aserp1040.oracle.com (Sentrion-MTA-4.3.2/Sentrion-MTA-4.3.2) with ESMTP id t6G1DvHp018024 (version=TLSv1 cipher=DHE-RSA-AES256-SHA bits=256 verify=OK); Thu, 16 Jul 2015 01:13:57 GMT Received: from userv0122.oracle.com (userv0122.oracle.com [156.151.31.75]) by aserv0022.oracle.com (8.13.8/8.13.8) with ESMTP id t6G1Dvw1007640 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=FAIL); Thu, 16 Jul 2015 01:13:57 GMT Received: from abhmp0007.oracle.com (abhmp0007.oracle.com [141.146.116.13]) by userv0122.oracle.com (8.13.8/8.13.8) with ESMTP id t6G1DuR4013611; Thu, 16 Jul 2015 01:13:56 GMT Received: from ca-mkp.ca.oracle.com (/10.156.108.201) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Wed, 15 Jul 2015 18:13:56 -0700 From: "Martin K. Petersen" To: linux-scsi@vger.kernel.org Cc: "Martin K. Petersen" , Subject: [PATCH] sd: Fix maximum I/O size for BLOCK_PC requests Date: Wed, 15 Jul 2015 21:13:46 -0400 Message-Id: <1437009226-599-1-git-send-email-martin.petersen@oracle.com> X-Mailer: git-send-email 2.4.3 In-Reply-To: <5581759A.4080009@linux.vnet.ibm.com> References: <5581759A.4080009@linux.vnet.ibm.com> X-Source-IP: aserv0022.oracle.com [141.146.126.234] Sender: linux-scsi-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org X-Spam-Status: No, score=-8.3 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Commit bcdb247c6b6a ("sd: Limit transfer length") clamped the maximum size of an I/O request to the MAXIMUM TRANSFER LENGTH field in the BLOCK LIMITS VPD. This had the unfortunate effect of also limiting the maximum size of non-filesystem requests sent to the device through sg/bsg. Avoid using blk_queue_max_hw_sectors() and set the max_sectors queue limit directly. Also update the comment in blk_limits_max_hw_sectors() to clarify that max_hw_sectors defines the limit for the I/O controller only. Signed-off-by: Martin K. Petersen Reported-by: Brian King Tested-by: Brian King Cc: # 3.17+ Reviewed-by: Hannes Reinecke --- block/blk-settings.c | 4 ++-- drivers/scsi/sd.c | 6 +++--- 2 files changed, 5 insertions(+), 5 deletions(-) diff --git a/block/blk-settings.c b/block/blk-settings.c index 12600bfffca9..e0057d035200 100644 --- a/block/blk-settings.c +++ b/block/blk-settings.c @@ -241,8 +241,8 @@ EXPORT_SYMBOL(blk_queue_bounce_limit); * Description: * Enables a low level driver to set a hard upper limit, * max_hw_sectors, on the size of requests. max_hw_sectors is set by - * the device driver based upon the combined capabilities of I/O - * controller and storage device. + * the device driver based upon the capabilities of the I/O + * controller. * * max_sectors is a soft limit imposed by the block layer for * filesystem type requests. This value can be overridden on a diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c index 3b2fcb4fada0..a20da8c25b4f 100644 --- a/drivers/scsi/sd.c +++ b/drivers/scsi/sd.c @@ -2770,9 +2770,9 @@ static int sd_revalidate_disk(struct gendisk *disk) max_xfer = sdkp->max_xfer_blocks; max_xfer <<= ilog2(sdp->sector_size) - 9; - max_xfer = min_not_zero(queue_max_hw_sectors(sdkp->disk->queue), - max_xfer); - blk_queue_max_hw_sectors(sdkp->disk->queue, max_xfer); + sdkp->disk->queue->limits.max_sectors = + min_not_zero(queue_max_hw_sectors(sdkp->disk->queue), max_xfer); + set_capacity(disk, sdkp->capacity); sd_config_write_same(sdkp); kfree(buffer);