From patchwork Sat Jan 9 10:42:50 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christoph Hellwig X-Patchwork-Id: 12008093 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=-16.7 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT 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 BFF9AC433E0 for ; Sat, 9 Jan 2021 10:47:23 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 8699423A23 for ; Sat, 9 Jan 2021 10:47:23 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726638AbhAIKrW (ORCPT ); Sat, 9 Jan 2021 05:47:22 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:54374 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725956AbhAIKrV (ORCPT ); Sat, 9 Jan 2021 05:47:21 -0500 Received: from casper.infradead.org (casper.infradead.org [IPv6:2001:8b0:10b:1236::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 395FDC061786; Sat, 9 Jan 2021 02:46:41 -0800 (PST) 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=tm46/p8xGvJZrA4UFHRSRl5YybeqFScWDNcbf2u9WV4=; b=R8EsSubjYzfHWHOhcdFz8vIWtg s3ZErXQrg2WYLXyM/qkf31uicxMafacZNC4iJtvH8Z5VlB/0AyXTANnXVE35/Hjs1SkXIe2cOYF2c FfSxggotM9it9zEejl4i/elmHPVrj+0J9fruBDnwzTgR7iizE/g+r9dn2tPWiqtyDtL4uDVjcF6eS TtWPLTRHot6isJFtb8affiE8cHw2oiXPENfZxAdFhoG/mN5rmf5q3MQV2QbzR9TOiuoRhdNwux9cH WzFJ0V5d8gyhmz2fdODSCcpqqbU2hB+x/h2hUDmTrF6uM/kv4RmJztmeDBA5mzDmUdlAA9TGTZsJR qhOAFXLg==; Received: from [2001:4bb8:19b:e528:4197:a20:99de:e7b0] (helo=localhost) by casper.infradead.org with esmtpsa (Exim 4.94 #2 (Red Hat Linux)) id 1kyBjS-000T18-2X; Sat, 09 Jan 2021 10:44:50 +0000 From: Christoph Hellwig To: Jens Axboe Cc: "Martin K . Petersen" , Oleksii Kurochko , Sagi Grimberg , Mike Snitzer , Ilya Dryomov , Dongsheng Yang , ceph-devel@vger.kernel.org, dm-devel@redhat.com, linux-block@vger.kernel.org, linux-nvme@lists.infradead.org, Ming Lei Subject: [PATCH 2/6] block: remove the NULL bdev check in bdev_read_only Date: Sat, 9 Jan 2021 11:42:50 +0100 Message-Id: <20210109104254.1077093-3-hch@lst.de> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20210109104254.1077093-1-hch@lst.de> References: <20210109104254.1077093-1-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 Precedence: bulk List-ID: X-Mailing-List: linux-block@vger.kernel.org Only a single caller can end up in bdev_read_only, so move the check there. Signed-off-by: Christoph Hellwig Reviewed-by: Ming Lei Reviewed-by: Martin K. Petersen Reviewed-by: Chaitanya Kulkarni Reviewed-by: Hannes Reinecke --- block/genhd.c | 3 --- fs/super.c | 3 ++- 2 files changed, 2 insertions(+), 4 deletions(-) diff --git a/block/genhd.c b/block/genhd.c index 73faec438e49a8..4f90f80d7aa76d 100644 --- a/block/genhd.c +++ b/block/genhd.c @@ -1654,11 +1654,8 @@ EXPORT_SYMBOL(set_disk_ro); int bdev_read_only(struct block_device *bdev) { - if (!bdev) - return 0; return bdev->bd_read_only; } - EXPORT_SYMBOL(bdev_read_only); /* diff --git a/fs/super.c b/fs/super.c index 2c6cdea2ab2d9e..5a1f384ffc74f6 100644 --- a/fs/super.c +++ b/fs/super.c @@ -865,7 +865,8 @@ int reconfigure_super(struct fs_context *fc) if (fc->sb_flags_mask & SB_RDONLY) { #ifdef CONFIG_BLOCK - if (!(fc->sb_flags & SB_RDONLY) && bdev_read_only(sb->s_bdev)) + if (!(fc->sb_flags & SB_RDONLY) && sb->s_bdev && + bdev_read_only(sb->s_bdev)) return -EACCES; #endif