From patchwork Fri Sep 5 16:51:25 2014 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Peter Lieven X-Patchwork-Id: 386461 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Received: from lists.gnu.org (lists.gnu.org [IPv6:2001:4830:134:3::11]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id A6B471400E9 for ; Sat, 6 Sep 2014 02:53:07 +1000 (EST) Received: from localhost ([::1]:59109 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1XPwkz-0000gh-79 for incoming@patchwork.ozlabs.org; Fri, 05 Sep 2014 12:53:05 -0400 Received: from eggs.gnu.org ([2001:4830:134:3::10]:54836) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1XPwkP-0008P6-GX for qemu-devel@nongnu.org; Fri, 05 Sep 2014 12:52:35 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1XPwkJ-0001z9-Qa for qemu-devel@nongnu.org; Fri, 05 Sep 2014 12:52:29 -0400 Received: from mx-v6.kamp.de ([2a02:248:0:51::16]:51860 helo=mx01.kamp.de) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1XPwkJ-0001yp-G7 for qemu-devel@nongnu.org; Fri, 05 Sep 2014 12:52:23 -0400 Received: (qmail 9295 invoked by uid 89); 5 Sep 2014 16:52:21 -0000 Received: from [82.141.1.145] by client-16-kamp (envelope-from , uid 89) with qmail-scanner-2010/03/19-MF (clamdscan: 0.98.4/19339. hbedv: 8.3.24.22/7.11.170.236. spamassassin: 3.4.0. Clear:RC:1(82.141.1.145):SA:0(-1.2/5.0):. Processed in 1.289157 secs); 05 Sep 2014 16:52:21 -0000 Received: from ns.kamp-intra.net (HELO dns.kamp-intra.net) ([82.141.1.145]) by mx01.kamp.de with SMTP; 5 Sep 2014 16:52:19 -0000 X-GL_Whitelist: yes Received: from lieven-pc.kamp-intra.net (lieven-pc.kamp-intra.net [172.21.12.60]) by dns.kamp-intra.net (Postfix) with ESMTP id 718962068F; Fri, 5 Sep 2014 18:51:29 +0200 (CEST) Received: by lieven-pc.kamp-intra.net (Postfix, from userid 1000) id 69A7061117; Fri, 5 Sep 2014 18:51:29 +0200 (CEST) From: Peter Lieven To: qemu-devel@nongnu.org Date: Fri, 5 Sep 2014 18:51:25 +0200 Message-Id: <1409935888-18552-2-git-send-email-pl@kamp.de> X-Mailer: git-send-email 1.7.9.5 In-Reply-To: <1409935888-18552-1-git-send-email-pl@kamp.de> References: <1409935888-18552-1-git-send-email-pl@kamp.de> X-detected-operating-system: by eggs.gnu.org: Error: Malformed IPv6 address (bad octet value). X-Received-From: 2a02:248:0:51::16 Cc: kwolf@redhat.com, stefanha@redhat.com, Peter Lieven , mreitz@redhat.com, ronniesahlberg@gmail.com, pbonzini@redhat.com Subject: [Qemu-devel] [PATCH 1/4] BlockLimits: introduce max_transfer_length X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Signed-off-by: Peter Lieven --- block.c | 4 ++++ include/block/block_int.h | 3 +++ 2 files changed, 7 insertions(+) diff --git a/block.c b/block.c index cb670fd..2c4a5de 100644 --- a/block.c +++ b/block.c @@ -529,6 +529,7 @@ void bdrv_refresh_limits(BlockDriverState *bs, Error **errp) return; } bs->bl.opt_transfer_length = bs->file->bl.opt_transfer_length; + bs->bl.max_transfer_length = bs->file->bl.max_transfer_length; bs->bl.opt_mem_alignment = bs->file->bl.opt_mem_alignment; } else { bs->bl.opt_mem_alignment = 512; @@ -543,6 +544,9 @@ void bdrv_refresh_limits(BlockDriverState *bs, Error **errp) bs->bl.opt_transfer_length = MAX(bs->bl.opt_transfer_length, bs->backing_hd->bl.opt_transfer_length); + bs->bl.max_transfer_length = + MIN(bs->bl.max_transfer_length, + bs->backing_hd->bl.max_transfer_length); bs->bl.opt_mem_alignment = MAX(bs->bl.opt_mem_alignment, bs->backing_hd->bl.opt_mem_alignment); diff --git a/include/block/block_int.h b/include/block/block_int.h index 8a61215..e178782 100644 --- a/include/block/block_int.h +++ b/include/block/block_int.h @@ -288,6 +288,9 @@ typedef struct BlockLimits { /* optimal transfer length in sectors */ int opt_transfer_length; + /* maximal transfer length in sectors */ + int max_transfer_length; + /* memory alignment so that no bounce buffer is needed */ size_t opt_mem_alignment; } BlockLimits;