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=-13.7 required=3.0 tests=BAYES_00,DATE_IN_PAST_06_12, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,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 3A0FBC6379D for ; Wed, 18 Nov 2020 21:34:29 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id B5468246CA for ; Wed, 18 Nov 2020 21:34:28 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org B5468246CA Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=suse.cz Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 19DD56B0036; Wed, 18 Nov 2020 16:34:27 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id E873A6B0071; Wed, 18 Nov 2020 16:34:26 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id CA7D76B0068; Wed, 18 Nov 2020 16:34:26 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0091.hostedemail.com [216.40.44.91]) by kanga.kvack.org (Postfix) with ESMTP id 8B31B6B005C for ; Wed, 18 Nov 2020 16:34:26 -0500 (EST) Received: from smtpin24.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay03.hostedemail.com (Postfix) with ESMTP id 30B398249980 for ; Wed, 18 Nov 2020 21:34:26 +0000 (UTC) X-FDA: 77498842932.24.lift62_370a2352733d Received: from filter.hostedemail.com (10.5.16.251.rfc1918.com [10.5.16.251]) by smtpin24.hostedemail.com (Postfix) with ESMTP id 0F6221A4A0 for ; Wed, 18 Nov 2020 21:34:26 +0000 (UTC) X-HE-Tag: lift62_370a2352733d X-Filterd-Recvd-Size: 3489 Received: from mx2.suse.de (mx2.suse.de [195.135.220.15]) by imf41.hostedemail.com (Postfix) with ESMTP for ; Wed, 18 Nov 2020 21:34:25 +0000 (UTC) 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 EF58DAFFD; Wed, 18 Nov 2020 21:34:23 +0000 (UTC) Received: by quack2.suse.cz (Postfix, from userid 1000) id BC1911E1321; Wed, 18 Nov 2020 15:22:37 +0100 (CET) Date: Wed, 18 Nov 2020 15:22:37 +0100 From: Jan Kara To: Christoph Hellwig Cc: Jens Axboe , Tejun Heo , Josef Bacik , Konrad Rzeszutek Wilk , Coly Li , Mike Snitzer , dm-devel@redhat.com, Richard Weinberger , Jan Kara , linux-block@vger.kernel.org, xen-devel@lists.xenproject.org, linux-bcache@vger.kernel.org, linux-mtd@lists.infradead.org, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org Subject: Re: [PATCH 06/20] block: change the hash used for looking up block devices Message-ID: <20201118142237.GK1981@quack2.suse.cz> References: <20201118084800.2339180-1-hch@lst.de> <20201118084800.2339180-7-hch@lst.de> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20201118084800.2339180-7-hch@lst.de> User-Agent: Mutt/1.10.1 (2018-07-13) 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 Wed 18-11-20 09:47:46, Christoph Hellwig wrote: > Adding the minor to the major creates tons of pointless conflicts. Just > use the dev_t itself, which is 32-bits and thus is guaranteed to fit > into ino_t. > > Signed-off-by: Christoph Hellwig Fair enough. You can add: Reviewed-by: Jan Kara Honza > --- > fs/block_dev.c | 26 ++------------------------ > 1 file changed, 2 insertions(+), 24 deletions(-) > > diff --git a/fs/block_dev.c b/fs/block_dev.c > index d8664f5c1ff669..29db12c3bb501c 100644 > --- a/fs/block_dev.c > +++ b/fs/block_dev.c > @@ -870,35 +870,12 @@ void __init bdev_cache_init(void) > blockdev_superblock = bd_mnt->mnt_sb; /* For writeback */ > } > > -/* > - * Most likely _very_ bad one - but then it's hardly critical for small > - * /dev and can be fixed when somebody will need really large one. > - * Keep in mind that it will be fed through icache hash function too. > - */ > -static inline unsigned long hash(dev_t dev) > -{ > - return MAJOR(dev)+MINOR(dev); > -} > - > -static int bdev_test(struct inode *inode, void *data) > -{ > - return BDEV_I(inode)->bdev.bd_dev == *(dev_t *)data; > -} > - > -static int bdev_set(struct inode *inode, void *data) > -{ > - BDEV_I(inode)->bdev.bd_dev = *(dev_t *)data; > - return 0; > -} > - > static struct block_device *bdget(dev_t dev) > { > struct block_device *bdev; > struct inode *inode; > > - inode = iget5_locked(blockdev_superblock, hash(dev), > - bdev_test, bdev_set, &dev); > - > + inode = iget_locked(blockdev_superblock, dev); > if (!inode) > return NULL; > > @@ -910,6 +887,7 @@ static struct block_device *bdget(dev_t dev) > bdev->bd_super = NULL; > bdev->bd_inode = inode; > bdev->bd_part_count = 0; > + bdev->bd_dev = dev; > inode->i_mode = S_IFBLK; > inode->i_rdev = dev; > inode->i_bdev = bdev; > -- > 2.29.2 > -- Jan Kara SUSE Labs, CR