From patchwork Mon Aug 16 13:19:09 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christoph Hellwig X-Patchwork-Id: 498496 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 C979EC4320A for ; Mon, 16 Aug 2021 13:42:40 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id ADBCC6324D for ; Mon, 16 Aug 2021 13:42:40 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236889AbhHPNnL (ORCPT ); Mon, 16 Aug 2021 09:43:11 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:53176 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S237361AbhHPNnJ (ORCPT ); Mon, 16 Aug 2021 09:43:09 -0400 Received: from casper.infradead.org (casper.infradead.org [IPv6:2001:8b0:10b:1236::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 37C2BC06807D; Mon, 16 Aug 2021 06:30:54 -0700 (PDT) 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=Z9Yri10K8M6BGWsRMrTxjIL24t36teCRg8L/pCbSkH8=; b=oG5gOuW0HzJM1OtrDGoUAqkcm6 EUTmPZK9dTTxPIk9iHscmU26urUK0QQYRXEOBAi/bGIBXubzyJ2hvFjHMtCcIwa4IkxDIUDotxF/m OwKAGW3farxT2NRauRfLByQ2l4iDWaL92S+uvrZgItcNeqgbqc4Mxx63rD/lxVSukC+SfxjthoQ+E 7fdO9qh3k/mg72P44vGRuxmcYn5n951Wl3T/9zaRPovcHBXmz2e16zVs5xPAnRetAhYK3craFqxJa ACZ0gPNAU+9asBoBW+QM437oIlXha/0BqnfwvY8N6GegluALpo7QasyHEnppYNs/tB3YPmgzoOl+0 ARv0jBkw==; Received: from [2001:4bb8:188:1b1:3731:604a:a6cd:dc60] (helo=localhost) by casper.infradead.org with esmtpsa (Exim 4.94.2 #2 (Red Hat Linux)) id 1mFcfm-001PUw-0D; Mon, 16 Aug 2021 13:29:15 +0000 From: Christoph Hellwig To: Jens Axboe Cc: Stefan Haberland , Jan Hoeppner , "Martin K. Petersen" , Doug Gilbert , =?utf-8?q?Kai_M=C3=A4kisara?= , Luis Chamberlain , linux-block@vger.kernel.org, linux-nvme@lists.infradead.org, linux-s390@vger.kernel.org, linux-scsi@vger.kernel.org Subject: [PATCH 8/9] block: hold a request_queue reference for the lifetime of struct gendisk Date: Mon, 16 Aug 2021 15:19:09 +0200 Message-Id: <20210816131910.615153-9-hch@lst.de> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210816131910.615153-1-hch@lst.de> References: <20210816131910.615153-1-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-scsi@vger.kernel.org Acquire the queue ref dropped in disk_release in __blk_alloc_disk so any allocate gendisk always has a queue reference. Signed-off-by: Christoph Hellwig --- block/genhd.c | 19 +++++++------------ include/linux/genhd.h | 1 - 2 files changed, 7 insertions(+), 13 deletions(-) diff --git a/block/genhd.c b/block/genhd.c index f18122ee2778..6294517cebe6 100644 --- a/block/genhd.c +++ b/block/genhd.c @@ -551,15 +551,6 @@ void device_add_disk(struct device *parent, struct gendisk *disk, register_disk(parent, disk, groups); blk_register_queue(disk); - /* - * Take an extra ref on queue which will be put on disk_release() - * so that it sticks around as long as @disk is there. - */ - if (blk_get_queue(disk->queue)) - set_bit(GD_QUEUE_REF, &disk->state); - else - WARN_ON_ONCE(1); - disk_add_events(disk); blk_integrity_add(disk); } @@ -1087,8 +1078,7 @@ static void disk_release(struct device *dev) disk_release_events(disk); kfree(disk->random); xa_destroy(&disk->part_tbl); - if (test_bit(GD_QUEUE_REF, &disk->state) && disk->queue) - blk_put_queue(disk->queue); + blk_put_queue(disk->queue); iput(disk->part0->bd_inode); /* frees the disk */ } @@ -1259,9 +1249,12 @@ struct gendisk *__alloc_disk_node(struct request_queue *q, int node_id, { struct gendisk *disk; + if (!blk_get_queue(q)) + return NULL; + disk = kzalloc_node(sizeof(struct gendisk), GFP_KERNEL, node_id); if (!disk) - return NULL; + goto out_put_queue; disk->bdi = bdi_alloc(node_id); if (!disk->bdi) @@ -1296,6 +1289,8 @@ struct gendisk *__alloc_disk_node(struct request_queue *q, int node_id, bdi_put(disk->bdi); out_free_disk: kfree(disk); +out_put_queue: + blk_put_queue(q); return NULL; } EXPORT_SYMBOL(__alloc_disk_node); diff --git a/include/linux/genhd.h b/include/linux/genhd.h index 13e90e6231d8..55acefdd8a20 100644 --- a/include/linux/genhd.h +++ b/include/linux/genhd.h @@ -149,7 +149,6 @@ struct gendisk { unsigned long state; #define GD_NEED_PART_SCAN 0 #define GD_READ_ONLY 1 -#define GD_QUEUE_REF 2 struct mutex open_mutex; /* open/close mutex */ unsigned open_partitions; /* number of open partitions */