Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933109AbdLRMYd (ORCPT ); Mon, 18 Dec 2017 07:24:33 -0500 Received: from mx1.redhat.com ([209.132.183.28]:39368 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932873AbdLRMY3 (ORCPT ); Mon, 18 Dec 2017 07:24:29 -0500 From: Ming Lei To: Jens Axboe , Christoph Hellwig , Alexander Viro , Kent Overstreet Cc: Huang Ying , linux-kernel@vger.kernel.org, linux-block@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org, "Theodore Ts'o" , "Darrick J . Wong" , Coly Li , Filipe Manana , Ming Lei , Mike Snitzer Subject: [PATCH V4 06/45] dm: limit the max bio size as BIO_MAX_PAGES * PAGE_SIZE Date: Mon, 18 Dec 2017 20:22:08 +0800 Message-Id: <20171218122247.3488-7-ming.lei@redhat.com> In-Reply-To: <20171218122247.3488-1-ming.lei@redhat.com> References: <20171218122247.3488-1-ming.lei@redhat.com> X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.30]); Mon, 18 Dec 2017 12:24:28 +0000 (UTC) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1001 Lines: 34 For BIO based DM, some targets aren't ready for dealing with bigger incoming bio than 1Mbyte, such as crypt target. Cc: Mike Snitzer Cc:dm-devel@redhat.com Reviewed-by: Christoph Hellwig Signed-off-by: Ming Lei --- drivers/md/dm.c | 10 +++++++++- 1 file changed, 9 insertions(+), 1 deletion(-) diff --git a/drivers/md/dm.c b/drivers/md/dm.c index de17b7193299..7475739fee49 100644 --- a/drivers/md/dm.c +++ b/drivers/md/dm.c @@ -920,7 +920,15 @@ int dm_set_target_max_io_len(struct dm_target *ti, sector_t len) return -EINVAL; } - ti->max_io_len = (uint32_t) len; + /* + * BIO based queue uses its own splitting. When multipage bvecs + * is switched on, size of the incoming bio may be too big to + * be handled in some targets, such as crypt. + * + * When these targets are ready for the big bio, we can remove + * the limit. + */ + ti->max_io_len = min_t(uint32_t, len, BIO_MAX_PAGES * PAGE_SIZE); return 0; } -- 2.9.5