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=-11.3 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_SANE_1 autolearn=unavailable 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 6C0A7C2BBD1 for ; Thu, 17 Sep 2020 09:55:18 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 3D07220770 for ; Thu, 17 Sep 2020 09:55:18 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726566AbgIQJzL (ORCPT ); Thu, 17 Sep 2020 05:55:11 -0400 Received: from mx2.suse.de ([195.135.220.15]:58124 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726200AbgIQJzK (ORCPT ); Thu, 17 Sep 2020 05:55:10 -0400 X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay2.suse.de (unknown [195.135.221.27]) by mx2.suse.de (Postfix) with ESMTP id 40398AEC8; Thu, 17 Sep 2020 09:55:41 +0000 (UTC) Received: by quack2.suse.cz (Postfix, from userid 1000) id 0A4781E12E1; Thu, 17 Sep 2020 11:55:07 +0200 (CEST) Date: Thu, 17 Sep 2020 11:55:07 +0200 From: Jan Kara To: Christoph Hellwig Cc: Jens Axboe , Song Liu , Hans de Goede , Richard Weinberger , Minchan Kim , linux-mtd@lists.infradead.org, dm-devel@redhat.com, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org, drbd-dev@lists.linbit.com, linux-raid@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org, cgroups@vger.kernel.org, Johannes Thumshirn Subject: Re: [PATCH 03/12] drbd: remove RB_CONGESTED_REMOTE Message-ID: <20200917095507.GJ7347@quack2.suse.cz> References: <20200910144833.742260-1-hch@lst.de> <20200910144833.742260-4-hch@lst.de> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20200910144833.742260-4-hch@lst.de> User-Agent: Mutt/1.10.1 (2018-07-13) Precedence: bulk List-ID: X-Mailing-List: linux-raid@vger.kernel.org On Thu 10-09-20 16:48:23, Christoph Hellwig wrote: > This case isn't ever used. > > Signed-off-by: Christoph Hellwig > Reviewed-by: Johannes Thumshirn Are you sure it's never used? As far as I'm reading drdb code the contents of the disk_conf structure seems to be received through netlink (that code is really a macro hell) and so read_balancing attribute passed to remote_due_to_read_balancing() can have any value userspace passed to it. Honza > --- > drivers/block/drbd/drbd_req.c | 4 ---- > include/linux/drbd.h | 1 - > 2 files changed, 5 deletions(-) > > diff --git a/drivers/block/drbd/drbd_req.c b/drivers/block/drbd/drbd_req.c > index 5c975af9c15fb8..481bc34fcf386a 100644 > --- a/drivers/block/drbd/drbd_req.c > +++ b/drivers/block/drbd/drbd_req.c > @@ -901,13 +901,9 @@ static bool drbd_may_do_local_read(struct drbd_device *device, sector_t sector, > static bool remote_due_to_read_balancing(struct drbd_device *device, sector_t sector, > enum drbd_read_balancing rbm) > { > - struct backing_dev_info *bdi; > int stripe_shift; > > switch (rbm) { > - case RB_CONGESTED_REMOTE: > - bdi = device->ldev->backing_bdev->bd_disk->queue->backing_dev_info; > - return bdi_read_congested(bdi); > case RB_LEAST_PENDING: > return atomic_read(&device->local_cnt) > > atomic_read(&device->ap_pending_cnt) + atomic_read(&device->rs_pending_cnt); > diff --git a/include/linux/drbd.h b/include/linux/drbd.h > index 5755537b51b114..6a8286132751df 100644 > --- a/include/linux/drbd.h > +++ b/include/linux/drbd.h > @@ -94,7 +94,6 @@ enum drbd_read_balancing { > RB_PREFER_REMOTE, > RB_ROUND_ROBIN, > RB_LEAST_PENDING, > - RB_CONGESTED_REMOTE, > RB_32K_STRIPING, > RB_64K_STRIPING, > RB_128K_STRIPING, > -- > 2.28.0 > -- Jan Kara SUSE Labs, CR