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[23.128.96.18]) by mx.google.com with ESMTP id f7si8612175jat.42.2021.07.16.03.43.31; Fri, 16 Jul 2021 03:43:43 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18; Authentication-Results: mx.google.com; dkim=pass header.i=@redhat.com header.s=mimecast20190719 header.b=KONg+0p7; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=redhat.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S239113AbhGPKpK (ORCPT + 99 others); Fri, 16 Jul 2021 06:45:10 -0400 Received: from us-smtp-delivery-124.mimecast.com ([170.10.133.124]:34344 "EHLO us-smtp-delivery-124.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S238809AbhGPKpJ (ORCPT ); Fri, 16 Jul 2021 06:45:09 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1626432134; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=eYv2Aol5Hptlza4XzCigRKb4M7GsMoM5cZVrcTu70PQ=; b=KONg+0p7EcGvEiIo25z6zIUXusijP0poCUQqudf+C2NO2jJJX/RarejFXny03oqXVSGo6P B7brB2NzVnnoZ0obyC+bNwIesE0suTTmdHydxPi9Osp9ZfH6ru+LFue8tZcC1Lb1yRT8N1 5h5XZMdKLSqU/klshKSn7T9W+HFMOps= 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-348-cY1zEBD4NcGFDboNVED5bw-1; Fri, 16 Jul 2021 06:42:13 -0400 X-MC-Unique: cY1zEBD4NcGFDboNVED5bw-1 Received: from smtp.corp.redhat.com (int-mx04.intmail.prod.int.phx2.redhat.com [10.5.11.14]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 44CFC8030B5; Fri, 16 Jul 2021 10:42:11 +0000 (UTC) Received: from T590 (ovpn-12-46.pek2.redhat.com [10.72.12.46]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 622B6752A0; Fri, 16 Jul 2021 10:41:57 +0000 (UTC) Date: Fri, 16 Jul 2021 18:41:52 +0800 From: Ming Lei To: Oleksandr Natalenko Cc: linux-kernel@vger.kernel.org, Jens Axboe , Christoph Hellwig , Sagi Grimberg , linux-nvme@lists.infradead.org, David Jeffery , Laurence Oberman , Paolo Valente , Jan Kara , Sasha Levin , Greg Kroah-Hartman , Keith Busch Subject: Re: New warning in nvme_setup_discard Message-ID: References: <4729812.CpyZKHjjVO@natalenko.name> <81322754.HEIg0oD171@natalenko.name> <2455133.St5lIfLNcX@natalenko.name> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <2455133.St5lIfLNcX@natalenko.name> X-Scanned-By: MIMEDefang 2.79 on 10.5.11.14 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri, Jul 16, 2021 at 12:03:43PM +0200, Oleksandr Natalenko wrote: > Hello. > > On pátek 16. července 2021 11:33:05 CEST Ming Lei wrote: > > Can you test the following patch? > > Sure, building it at the moment, and will give it a try. Also please see my > comments and questions below. > > > > > diff --git a/block/bfq-iosched.c b/block/bfq-iosched.c > > index 727955918563..673a634eadd9 100644 > > --- a/block/bfq-iosched.c > > +++ b/block/bfq-iosched.c > > @@ -2361,6 +2361,9 @@ static int bfq_request_merge(struct request_queue *q, > > struct request **req, __rq = bfq_find_rq_fmerge(bfqd, bio, q); > > if (__rq && elv_bio_merge_ok(__rq, bio)) { > > *req = __rq; > > + > > + if (blk_discard_mergable(__rq)) > > + return ELEVATOR_DISCARD_MERGE; > > return ELEVATOR_FRONT_MERGE; > > } > > > > diff --git a/block/blk-merge.c b/block/blk-merge.c > > index a11b3b53717e..f8707ff7e2fc 100644 > > --- a/block/blk-merge.c > > +++ b/block/blk-merge.c > > @@ -705,22 +705,6 @@ static void blk_account_io_merge_request(struct request > > *req) } > > } > > > > -/* > > - * Two cases of handling DISCARD merge: > > - * If max_discard_segments > 1, the driver takes every bio > > - * as a range and send them to controller together. The ranges > > - * needn't to be contiguous. > > - * Otherwise, the bios/requests will be handled as same as > > - * others which should be contiguous. > > - */ > > -static inline bool blk_discard_mergable(struct request *req) > > -{ > > - if (req_op(req) == REQ_OP_DISCARD && > > - queue_max_discard_segments(req->q) > 1) > > - return true; > > - return false; > > -} > > - > > static enum elv_merge blk_try_req_merge(struct request *req, > > struct request *next) > > { > > diff --git a/block/elevator.c b/block/elevator.c > > index 52ada14cfe45..a5fe2615ec0f 100644 > > --- a/block/elevator.c > > +++ b/block/elevator.c > > @@ -336,6 +336,9 @@ enum elv_merge elv_merge(struct request_queue *q, struct > > request **req, __rq = elv_rqhash_find(q, bio->bi_iter.bi_sector); > > if (__rq && elv_bio_merge_ok(__rq, bio)) { > > *req = __rq; > > + > > + if (blk_discard_mergable(__rq)) > > + return ELEVATOR_DISCARD_MERGE; > > return ELEVATOR_BACK_MERGE; > > } > > > > diff --git a/block/mq-deadline-main.c b/block/mq-deadline-main.c > > index 6f612e6dc82b..294be0c0db65 100644 > > --- a/block/mq-deadline-main.c > > +++ b/block/mq-deadline-main.c > > I had to adjust this against v5.13 because there's no mq-deadline-main.c, only > mq-deadline.c (due to Bart series, I assume). I hope this is fine as the patch > applies cleanly. > > > @@ -677,6 +677,8 @@ static int dd_request_merge(struct request_queue *q, > > struct request **rq, > > > > if (elv_bio_merge_ok(__rq, bio)) { > > *rq = __rq; > > + if (blk_discard_mergable(__rq)) > > + return ELEVATOR_DISCARD_MERGE; > > return ELEVATOR_FRONT_MERGE; > > } > > } > > diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h > > index 3177181c4326..87f00292fd7a 100644 > > --- a/include/linux/blkdev.h > > +++ b/include/linux/blkdev.h > > @@ -1521,6 +1521,22 @@ static inline int > > queue_limit_discard_alignment(struct queue_limits *lim, sector return > > offset << SECTOR_SHIFT; > > } > > > > +/* > > + * Two cases of handling DISCARD merge: > > + * If max_discard_segments > 1, the driver takes every bio > > + * as a range and send them to controller together. The ranges > > + * needn't to be contiguous. > > + * Otherwise, the bios/requests will be handled as same as > > + * others which should be contiguous. > > + */ > > +static inline bool blk_discard_mergable(struct request *req) > > +{ > > + if (req_op(req) == REQ_OP_DISCARD && > > + queue_max_discard_segments(req->q) > 1) > > + return true; > > + return false; > > +} > > + > > static inline int bdev_discard_alignment(struct block_device *bdev) > > { > > struct request_queue *q = bdev_get_queue(bdev); > > Do I understand correctly that this will be something like: > > Fixes: 2705dfb209 ("block: fix discard request merge") > > ? > > Because as the bisection progresses, I've bumped into this commit only. > Without it the issue is not reproducible, at least so far. It could be. So can you just test v5.14-rc1? Thanks, Ming