From patchwork Tue Nov 24 13:27:22 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christoph Hellwig X-Patchwork-Id: 11928841 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=-16.6 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT 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 AFA4EC82584 for ; Tue, 24 Nov 2020 13:28:55 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 32532208C3 for ; Tue, 24 Nov 2020 13:28:55 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="PBlG+SI1" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 32532208C3 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 E80B66B00DB; Tue, 24 Nov 2020 08:28:38 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id E07486B00DC; Tue, 24 Nov 2020 08:28:38 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id CAB366B00DD; Tue, 24 Nov 2020 08:28:38 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0111.hostedemail.com [216.40.44.111]) by kanga.kvack.org (Postfix) with ESMTP id A7EFB6B00DB for ; Tue, 24 Nov 2020 08:28:38 -0500 (EST) Received: from smtpin28.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay03.hostedemail.com (Postfix) with ESMTP id 6C0AA8249980 for ; Tue, 24 Nov 2020 13:28:38 +0000 (UTC) X-FDA: 77519391516.28.wool07_210f8892736e Received: from filter.hostedemail.com (10.5.16.251.rfc1918.com [10.5.16.251]) by smtpin28.hostedemail.com (Postfix) with ESMTP id F30426D72 for ; Tue, 24 Nov 2020 13:28:37 +0000 (UTC) X-HE-Tag: wool07_210f8892736e X-Filterd-Recvd-Size: 4018 Received: from casper.infradead.org (casper.infradead.org [90.155.50.34]) by imf36.hostedemail.com (Postfix) with ESMTP for ; Tue, 24 Nov 2020 13:28:37 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=Content-Transfer-Encoding:MIME-Version: References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From:Sender:Reply-To: Content-Type:Content-ID:Content-Description; bh=aYwkX4I6zMx34nzrdb7tYezzW5eC03Czg70BjD05yqI=; b=PBlG+SI1LP3b7gr/lJlKmKFFJd bocVKBuspYZb9+bd6oRwQGEd0L7j3hQYuLx9nBobabPLesfL8HLab1E4KCm/5+LC3aeewsBsrF0Ec hulcbyCIFfsfA8vcNobuzkqbXhMEwxxlSaiC+PbDLVpuj7Vfeb4n/Hc03FWeCTlPALu7BKMacg7VB VdoUIV8XfOoQvjg+7Lpil7jQgfh2pOibzDF+EEKPx14W4pVYNFzWxgoqa5dOjKsd+dX8NOcHTR0xd r+KlCQy9eeFmFLAe7pGrffUSOJRf0kI5rzxEXRSylWdG/EZ+5D3kd5agpzXpiDKm6I3+ieiU+g83C 6CbAnNrA==; Received: from [2001:4bb8:180:5443:c70:4a89:bc61:3] (helo=localhost) by casper.infradead.org with esmtpsa (Exim 4.92.3 #3 (Red Hat Linux)) id 1khYMk-0006Xd-Im; Tue, 24 Nov 2020 13:28:19 +0000 From: Christoph Hellwig To: Jens Axboe Cc: Tejun Heo , Josef Bacik , Konrad Rzeszutek Wilk , Coly Li , Mike Snitzer , Greg Kroah-Hartman , Jan Kara , Johannes Thumshirn , 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: [PATCH 16/45] block: change the hash used for looking up block devices Date: Tue, 24 Nov 2020 14:27:22 +0100 Message-Id: <20201124132751.3747337-17-hch@lst.de> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20201124132751.3747337-1-hch@lst.de> References: <20201124132751.3747337-1-hch@lst.de> MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org. See http://www.infradead.org/rpr.html 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: 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 Reviewed-by: Greg Kroah-Hartman Reviewed-by: Jan Kara Acked-by: Tejun Heo --- 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 f6a2a06ad262fa..437f67e12b2838 100644 --- a/fs/block_dev.c +++ b/fs/block_dev.c @@ -863,35 +863,12 @@ 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; @@ -903,6 +880,7 @@ 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;