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=-16.8 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 39BC0C433E3 for ; Tue, 30 Mar 2021 16:18:47 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 0DAF6619DD for ; Tue, 30 Mar 2021 16:18:47 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232259AbhC3QSL (ORCPT ); Tue, 30 Mar 2021 12:18:11 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:40854 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232057AbhC3QRv (ORCPT ); Tue, 30 Mar 2021 12:17:51 -0400 Received: from bombadil.infradead.org (bombadil.infradead.org [IPv6:2607:7c80:54:e::133]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 4A04CC061762; Tue, 30 Mar 2021 09:17:51 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20210309; 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=2cGt9xT944F9z97CftgWxJIJ2NbgYHlJKGjrwdV7j/4=; b=EoFPFG7j4+JD/o23ZlBdavhIhl h1IElVK5cadV2jfQnre4Ey+P/82f+6weVFspmAplX3Vh1aGetjcbhiJDQj2pM122oZ3Rhfy6KOCix FRboh8qGwpkfqKiaGYR5xGAeGcN3ukNHNj0LwhuZ42eDcfHs/WIrqFnE+TuCTKzusU14lxZCxAoSL x44XFclxLIPFhNRN2scry2/nAzlGoZ9lZDORKU0MwRWKJBp88Fs9RkgIhnsNU1CtoD1IWnel+ekZF gBi0tU6/9tUNxwppPl+axGWXyW2746qKyC/AA/rYAzuvPYxCpVTtrCXUOs/dEutnXYcNeUkfvr+p/ s95WUcjg==; Received: from [185.12.131.45] (helo=localhost) by bombadil.infradead.org with esmtpsa (Exim 4.94 #2 (Red Hat Linux)) id 1lRH3r-008aKb-Lw; Tue, 30 Mar 2021 16:17:48 +0000 From: Christoph Hellwig To: Jens Axboe , Song Liu Cc: Konrad Rzeszutek Wilk , =?UTF-8?q?Roger=20Pau=20Monn=C3=A9?= , Minchan Kim , Nitin Gupta , Stefan Haberland , Jan Hoeppner , linux-block@vger.kernel.org, linux-raid@vger.kernel.org, linux-s390@vger.kernel.org, linux-scsi@vger.kernel.org Subject: [PATCH 06/15] md: do not return existing mddevs from mddev_find_or_alloc Date: Tue, 30 Mar 2021 18:17:18 +0200 Message-Id: <20210330161727.2297292-7-hch@lst.de> X-Mailer: git-send-email 2.30.1 In-Reply-To: <20210330161727.2297292-1-hch@lst.de> References: <20210330161727.2297292-1-hch@lst.de> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-SRS-Rewrite: SMTP reverse-path rewritten from by bombadil.infradead.org. See http://www.infradead.org/rpr.html Precedence: bulk List-ID: X-Mailing-List: linux-block@vger.kernel.org Instead of returning an existing mddev, just for it to be discarded later directly return -EEXIST. Rename the function to mddev_alloc now that it doesn't find an existing mddev. Signed-off-by: Christoph Hellwig --- drivers/md/md.c | 46 +++++++++++++++++++++++----------------------- 1 file changed, 23 insertions(+), 23 deletions(-) diff --git a/drivers/md/md.c b/drivers/md/md.c index ea9c92c113619b..e614c40ca58974 100644 --- a/drivers/md/md.c +++ b/drivers/md/md.c @@ -782,26 +782,24 @@ static struct mddev *mddev_find(dev_t unit) return mddev; } -static struct mddev *mddev_find_or_alloc(dev_t unit) +static struct mddev *mddev_alloc(dev_t unit) { - struct mddev *mddev = NULL, *new; + struct mddev *new; + int error; if (unit && MAJOR(unit) != MD_MAJOR) unit &= ~((1 << MdpMinorShift) - 1); new = kzalloc(sizeof(*new), GFP_KERNEL); if (!new) - return NULL; + return ERR_PTR(-ENOMEM); mddev_init(new); spin_lock(&all_mddevs_lock); if (unit) { - mddev = mddev_find_locked(unit); - if (mddev) { - mddev_get(mddev); + error = -EEXIST; + if (mddev_find_locked(unit)) goto out_free_new; - } - new->unit = unit; if (MAJOR(unit) == MD_MAJOR) new->md_minor = MINOR(unit); @@ -809,6 +807,7 @@ static struct mddev *mddev_find_or_alloc(dev_t unit) new->md_minor = MINOR(unit) >> MdpMinorShift; new->hold_active = UNTIL_IOCTL; } else { + error = -ENODEV; new->unit = mddev_alloc_unit(); if (!new->unit) goto out_free_new; @@ -822,7 +821,7 @@ static struct mddev *mddev_find_or_alloc(dev_t unit) out_free_new: spin_unlock(&all_mddevs_lock); kfree(new); - return mddev; + return ERR_PTR(error); } static struct attribute_group md_redundancy_group; @@ -5661,29 +5660,29 @@ static int md_alloc(dev_t dev, char *name) * writing to /sys/module/md_mod/parameters/new_array. */ static DEFINE_MUTEX(disks_mutex); - struct mddev *mddev = mddev_find_or_alloc(dev); + struct mddev *mddev; struct gendisk *disk; int partitioned; int shift; int unit; - int error; + int error ; - if (!mddev) - return -ENODEV; - - partitioned = (MAJOR(mddev->unit) != MD_MAJOR); - shift = partitioned ? MdpMinorShift : 0; - unit = MINOR(mddev->unit) >> shift; - - /* wait for any previous instance of this device to be - * completely removed (mddev_delayed_delete). + /* + * Wait for any previous instance of this device to be completely + * removed (mddev_delayed_delete). */ flush_workqueue(md_misc_wq); mutex_lock(&disks_mutex); - error = -EEXIST; - if (mddev->gendisk) - goto abort; + mddev = mddev_alloc(dev); + if (IS_ERR(mddev)) { + mutex_unlock(&disks_mutex); + return PTR_ERR(mddev); + } + + partitioned = (MAJOR(mddev->unit) != MD_MAJOR); + shift = partitioned ? MdpMinorShift : 0; + unit = MINOR(mddev->unit) >> shift; if (name && !dev) { /* Need to ensure that 'name' is not a duplicate. @@ -5695,6 +5694,7 @@ static int md_alloc(dev_t dev, char *name) if (mddev2->gendisk && strcmp(mddev2->gendisk->disk_name, name) == 0) { spin_unlock(&all_mddevs_lock); + error = -EEXIST; goto abort; } spin_unlock(&all_mddevs_lock); -- 2.30.1