From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-oi0-f72.google.com (mail-oi0-f72.google.com [209.85.218.72]) by kanga.kvack.org (Postfix) with ESMTP id 4D9D46B0270 for ; Mon, 18 Dec 2017 07:24:30 -0500 (EST) Received: by mail-oi0-f72.google.com with SMTP id c85so7040891oib.13 for ; Mon, 18 Dec 2017 04:24:30 -0800 (PST) Received: from mx1.redhat.com (mx1.redhat.com. [209.132.183.28]) by mx.google.com with ESMTPS id d22si4220196otd.252.2017.12.18.04.24.29 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Mon, 18 Dec 2017 04:24:29 -0800 (PST) From: Ming Lei 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> Sender: owner-linux-mm@kvack.org List-ID: 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 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 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org