From patchwork Wed Jul 26 23:58:06 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Goldwyn Rodrigues X-Patchwork-Id: 9866053 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 6FB5860225 for ; Wed, 26 Jul 2017 23:59:21 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 61D95287B4 for ; Wed, 26 Jul 2017 23:59:21 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 5131C287C9; Wed, 26 Jul 2017 23:59:21 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.9 required=2.0 tests=BAYES_00,RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id E5C81287DB for ; Wed, 26 Jul 2017 23:59:20 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751529AbdGZX6s (ORCPT ); Wed, 26 Jul 2017 19:58:48 -0400 Received: from mx2.suse.de ([195.135.220.15]:46157 "EHLO mx1.suse.de" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1751472AbdGZX6q (ORCPT ); Wed, 26 Jul 2017 19:58:46 -0400 X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay2.suse.de (charybdis-ext.suse.de [195.135.220.254]) by mx1.suse.de (Postfix) with ESMTP id C605FAEAA; Wed, 26 Jul 2017 23:58:44 +0000 (UTC) From: Goldwyn Rodrigues To: linux-block@vger.kernel.org Cc: hch@infradead.org, jack@suse.cz, linux-raid@vger.kernel.org, dm-devel@redhat.com, Goldwyn Rodrigues Subject: [PATCH 9/9] dm-mpath: Add nowait support Date: Wed, 26 Jul 2017 18:58:06 -0500 Message-Id: <20170726235806.12148-10-rgoldwyn@suse.de> X-Mailer: git-send-email 2.12.3 In-Reply-To: <20170726235806.12148-1-rgoldwyn@suse.de> References: <20170726235806.12148-1-rgoldwyn@suse.de> Sender: linux-block-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-block@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP From: Goldwyn Rodrigues If there are no queues, bail if REQ_NOWAIT is set instead of queueing up I/O. Signed-off-by: Goldwyn Rodrigues --- drivers/md/dm-mpath.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/drivers/md/dm-mpath.c b/drivers/md/dm-mpath.c index 0e8ab5bb3575..c6572a9967dc 100644 --- a/drivers/md/dm-mpath.c +++ b/drivers/md/dm-mpath.c @@ -543,6 +543,11 @@ static int __multipath_map_bio(struct multipath *m, struct bio *bio, struct dm_m if ((pgpath && queue_io) || (!pgpath && test_bit(MPATHF_QUEUE_IF_NO_PATH, &m->flags))) { + /* Bail if nowait is set */ + if (bio->bi_opf & REQ_NOWAIT) { + bio_wouldblock_error(bio); + return DM_MAPIO_SUBMITTED; + } /* Queue for the daemon to resubmit */ spin_lock_irqsave(&m->lock, flags); bio_list_add(&m->queued_bios, bio);