Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756812AbcCVGOQ (ORCPT ); Tue, 22 Mar 2016 02:14:16 -0400 Received: from mail-pf0-f195.google.com ([209.85.192.195]:33909 "EHLO mail-pf0-f195.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753264AbcCVGNE (ORCPT ); Tue, 22 Mar 2016 02:13:04 -0400 From: Ming Lei To: Jens Axboe , linux-kernel@vger.kernel.org Cc: linux-block@vger.kernel.org, Christoph Hellwig , Al Viro , Anton Altaparmakov , xfs@oss.sgi.com, Dave Chinner , drbd-dev@lists.linbit.com, Philipp Reisner , Lars Ellenberg , Boaz Harrosh , Ming Lei Subject: [PATCH 7/8] block: drbd: avoid to use BIO_MAX_SIZE Date: Tue, 22 Mar 2016 14:12:28 +0800 Message-Id: <1458627149-12988-8-git-send-email-ming.lei@canonical.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1458627149-12988-1-git-send-email-ming.lei@canonical.com> References: <1458627149-12988-1-git-send-email-ming.lei@canonical.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1112 Lines: 31 drbd is the only user of BIO_MAX_SIZE, so use BIO_MAX_PAGES instead. Signed-off-by: Ming Lei --- drivers/block/drbd/drbd_int.h | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/block/drbd/drbd_int.h b/drivers/block/drbd/drbd_int.h index c227fd4..10bfff1 100644 --- a/drivers/block/drbd/drbd_int.h +++ b/drivers/block/drbd/drbd_int.h @@ -1327,14 +1327,14 @@ struct bm_extent { #endif #endif -/* BIO_MAX_SIZE is 256 * PAGE_CACHE_SIZE, +/* Estimate max bio size as 256 * PAGE_CACHE_SIZE, * so for typical PAGE_CACHE_SIZE of 4k, that is (1<<20) Byte. * Since we may live in a mixed-platform cluster, * we limit us to a platform agnostic constant here for now. * A followup commit may allow even bigger BIO sizes, * once we thought that through. */ #define DRBD_MAX_BIO_SIZE (1U << 20) -#if DRBD_MAX_BIO_SIZE > BIO_MAX_SIZE +#if DRBD_MAX_BIO_SIZE > (BIO_MAX_PAGES << PAGE_CACHE_SHIFT) #error Architecture not supported: DRBD_MAX_BIO_SIZE > BIO_MAX_SIZE #endif #define DRBD_MAX_BIO_SIZE_SAFE (1U << 12) /* Works always = 4k */ -- 1.9.1