From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-15.9 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 683E1C48BE6 for ; Wed, 16 Jun 2021 13:07:10 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 53A9B61359 for ; Wed, 16 Jun 2021 13:07:10 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233240AbhFPNJO (ORCPT ); Wed, 16 Jun 2021 09:09:14 -0400 Received: from us-smtp-delivery-124.mimecast.com ([216.205.24.124]:33622 "EHLO us-smtp-delivery-124.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233218AbhFPNJL (ORCPT ); Wed, 16 Jun 2021 09:09:11 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1623848824; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=YIkgsb2GruWXtknprN6c4/O3dDtMstZMPs68M+U4+/o=; b=MsKD02dZSVfy2HaxY74qQSm7DYE2njyQKnzJ0gZ97Dfkye5XfTufBWaWBvn9ZQjzbB7bGF sCmfWQYIJ71nBFdeOfSDrOpbwB4yObPjHADHooiccmv7dKovAy14ggyhO8hC61QSvy5hQR 2WhyMOl0SHYUmond0mtqdCSst9sYivE= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-253-SslDtkamOtGAtFJjL0R2lw-1; Wed, 16 Jun 2021 09:07:02 -0400 X-MC-Unique: SslDtkamOtGAtFJjL0R2lw-1 Received: from smtp.corp.redhat.com (int-mx02.intmail.prod.int.phx2.redhat.com [10.5.11.12]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id F1EDCA40DB; Wed, 16 Jun 2021 13:07:00 +0000 (UTC) Received: from localhost (ovpn-12-48.pek2.redhat.com [10.72.12.48]) by smtp.corp.redhat.com (Postfix) with ESMTP id 4723860C13; Wed, 16 Jun 2021 13:06:59 +0000 (UTC) From: Ming Lei To: Jens Axboe , Mike Snitzer Cc: linux-block@vger.kernel.org, Jeffle Xu , dm-devel@redhat.com, Hannes Reinecke , Christoph Hellwig , Ming Lei Subject: [RFC PATCH 3/4] block: add ->poll_bio to block_device_operations Date: Wed, 16 Jun 2021 21:05:32 +0800 Message-Id: <20210616130533.754248-4-ming.lei@redhat.com> In-Reply-To: <20210616130533.754248-1-ming.lei@redhat.com> References: <20210616130533.754248-1-ming.lei@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Scanned-By: MIMEDefang 2.79 on 10.5.11.12 Precedence: bulk List-ID: X-Mailing-List: linux-block@vger.kernel.org Prepare for supporting IO polling for bio based driver. Add ->poll_bio callback so that bio driver can provide their own logic for polling bio. Signed-off-by: Ming Lei --- block/blk-core.c | 18 +++++++++++++----- block/genhd.c | 3 +++ include/linux/blkdev.h | 2 ++ 3 files changed, 18 insertions(+), 5 deletions(-) diff --git a/block/blk-core.c b/block/blk-core.c index 1e24c71c6738..a1552ec8d608 100644 --- a/block/blk-core.c +++ b/block/blk-core.c @@ -1113,11 +1113,13 @@ EXPORT_SYMBOL(submit_bio); */ int bio_poll(struct bio *bio, unsigned int flags) { - struct request_queue *q = bio->bi_bdev->bd_disk->queue; + struct gendisk *disk = bio->bi_bdev->bd_disk; + struct request_queue *q = disk->queue; blk_qc_t cookie = READ_ONCE(bio->bi_cookie); int ret; - if (cookie == BLK_QC_T_NONE || !blk_queue_poll(q)) + if ((queue_is_mq(q) && cookie == BLK_QC_T_NONE) || + !blk_queue_poll(q)) return 0; if (current->plug) @@ -1125,10 +1127,16 @@ int bio_poll(struct bio *bio, unsigned int flags) if (blk_queue_enter(q, BLK_MQ_REQ_NOWAIT)) return 0; - if (WARN_ON_ONCE(!queue_is_mq(q))) - ret = 0; /* not yet implemented, should not happen */ - else + if (!queue_is_mq(q)) { + if (disk->fops->poll_bio) { + ret = disk->fops->poll_bio(bio, flags); + } else { + WARN_ON_ONCE(1); + ret = 0; + } + } else { ret = blk_mq_poll(q, cookie, flags); + } blk_queue_exit(q); return ret; } diff --git a/block/genhd.c b/block/genhd.c index 5f5628216295..042dfa5b3f79 100644 --- a/block/genhd.c +++ b/block/genhd.c @@ -471,6 +471,9 @@ static void __device_add_disk(struct device *parent, struct gendisk *disk, { int ret; + /* ->poll_bio is only for bio based driver */ + WARN_ON_ONCE(queue_is_mq(disk->queue) && disk->fops->poll_bio); + /* * The disk queue should now be all set with enough information about * the device for the elevator code to pick an adequate default diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h index fc0ba0b80776..6da6fb120148 100644 --- a/include/linux/blkdev.h +++ b/include/linux/blkdev.h @@ -1858,6 +1858,8 @@ static inline void blk_ksm_unregister(struct request_queue *q) { } struct block_device_operations { void (*submit_bio)(struct bio *bio); + /* ->poll_bio is for bio driver only */ + int (*poll_bio)(struct bio *bio, unsigned int flags); int (*open) (struct block_device *, fmode_t); void (*release) (struct gendisk *, fmode_t); int (*rw_page)(struct block_device *, sector_t, struct page *, unsigned int); -- 2.31.1