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=-10.2 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS,USER_AGENT_SANE_1 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 F1E0AC56202 for ; Thu, 26 Nov 2020 17:52:13 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 5149320665 for ; Thu, 26 Nov 2020 17:52:13 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 5149320665 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=lst.de Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id A8BFB6B0075; Thu, 26 Nov 2020 12:52:12 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id A3BCC6B0078; Thu, 26 Nov 2020 12:52:12 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 97AE76B007B; Thu, 26 Nov 2020 12:52:12 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0056.hostedemail.com [216.40.44.56]) by kanga.kvack.org (Postfix) with ESMTP id 81E236B0075 for ; Thu, 26 Nov 2020 12:52:12 -0500 (EST) Received: from smtpin06.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay03.hostedemail.com (Postfix) with ESMTP id 4043F824999B for ; Thu, 26 Nov 2020 17:52:12 +0000 (UTC) X-FDA: 77527313304.06.size08_131247027381 Received: from filter.hostedemail.com (10.5.16.251.rfc1918.com [10.5.16.251]) by smtpin06.hostedemail.com (Postfix) with ESMTP id 1B2F21003F33D for ; Thu, 26 Nov 2020 17:52:12 +0000 (UTC) X-HE-Tag: size08_131247027381 X-Filterd-Recvd-Size: 2844 Received: from verein.lst.de (verein.lst.de [213.95.11.211]) by imf50.hostedemail.com (Postfix) with ESMTP for ; Thu, 26 Nov 2020 17:52:11 +0000 (UTC) Received: by verein.lst.de (Postfix, from userid 2407) id 7355A68B05; Thu, 26 Nov 2020 18:52:08 +0100 (CET) Date: Thu, 26 Nov 2020 18:52:08 +0100 From: Christoph Hellwig To: Jan Kara Cc: Christoph Hellwig , Jens Axboe , Tejun Heo , Josef Bacik , Coly Li , Mike Snitzer , Greg Kroah-Hartman , Johannes Thumshirn , dm-devel@redhat.com, Jan Kara , linux-block@vger.kernel.org, linux-bcache@vger.kernel.org, linux-mtd@lists.infradead.org, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org, Chao Yu Subject: Re: [PATCH 29/44] block: remove the nr_sects field in struct hd_struct Message-ID: <20201126175208.GA24843@lst.de> References: <20201126130422.92945-1-hch@lst.de> <20201126130422.92945-30-hch@lst.de> <20201126165036.GO422@quack2.suse.cz> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20201126165036.GO422@quack2.suse.cz> User-Agent: Mutt/1.5.17 (2007-11-01) X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Thu, Nov 26, 2020 at 05:50:36PM +0100, Jan Kara wrote: > > + if (size == capacity || > > + (disk->flags & (GENHD_FL_UP | GENHD_FL_HIDDEN)) != GENHD_FL_UP) > > + return false; > > + pr_info("%s: detected capacity change from %lld to %lld\n", > > + disk->disk_name, size, capacity); > > + kobject_uevent_env(&disk_to_dev(disk)->kobj, KOBJ_CHANGE, envp); > > I think we don't want to generate resize event for changes from / to 0... Didn't you ask for that in the last round? > Also the return value of this function is now different. It returns true if it did send an uevent, which is what the callers rely on. > > diff --git a/drivers/target/target_core_pscsi.c b/drivers/target/target_core_pscsi.c > > index 4e37fa9b409d52..a70c33c49f0960 100644 > > --- a/drivers/target/target_core_pscsi.c > > +++ b/drivers/target/target_core_pscsi.c > > @@ -1027,12 +1027,7 @@ static u32 pscsi_get_device_type(struct se_device *dev) > > > > static sector_t pscsi_get_blocks(struct se_device *dev) > > { > > - struct pscsi_dev_virt *pdv = PSCSI_DEV(dev); > > - > > - if (pdv->pdv_bd && pdv->pdv_bd->bd_part) > > - return pdv->pdv_bd->bd_part->nr_sects; > > - > > - return 0; > > + return bdev_nr_sectors(PSCSI_DEV(dev)->pdv_bd); > > I pdv_bd guaranteed to be non-NULL in pscsi_dev_virt? Looking at the code - only for disk devices. And while ->get_blocks should only be called for those I'd rather err on the safe side and will add the check back.