From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mx1.redhat.com ([209.132.183.28]:50734 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753123AbdLHNPi (ORCPT ); Fri, 8 Dec 2017 08:15:38 -0500 From: Ming Lei To: Jens Axboe , linux-block@vger.kernel.org Cc: Christoph Hellwig , Ming Lei , Mike Snitzer Subject: [PATCH 06/10] dm: limit the max bio size as BIO_MAX_PAGES * PAGE_SIZE Date: Fri, 8 Dec 2017 21:14:05 +0800 Message-Id: <20171208131409.11889-7-ming.lei@redhat.com> In-Reply-To: <20171208131409.11889-1-ming.lei@redhat.com> References: <20171208131409.11889-1-ming.lei@redhat.com> Sender: linux-block-owner@vger.kernel.org List-Id: linux-block@vger.kernel.org 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