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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 6E788C6379F for ; Tue, 17 Jan 2023 08:13:18 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236024AbjAQINP (ORCPT ); Tue, 17 Jan 2023 03:13:15 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:58738 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S236012AbjAQINK (ORCPT ); Tue, 17 Jan 2023 03:13:10 -0500 Received: from bombadil.infradead.org (bombadil.infradead.org [IPv6:2607:7c80:54:3::133]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 563A121953; Tue, 17 Jan 2023 00:13:10 -0800 (PST) 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=t79ScEKFFWGwdQXbMIOuqC6iBTrnY4NcEplu2ubT2eI=; b=sfva6z35Lhxf9ouEZtZ4gvh0ac HC4MIGpu/VW71iKICgMuzdywze3zYGBBNvR/6lKUuh9zdj6CvK2AIFrJbr4dWo0Slw8aXMdxy1seg cmFTKD1lky5aYubxisbZT+FXR7IPbLBAE7D9kaiYsZT1IFkdeVJLQwkEg+L6quFwdsA4V6gmkzXOd kOgZTJ5Uo0P36u/kUM+EenvutBj2AMrpCPv4D3lHOEVwLv34FHCJh+O8lu4BxUxQ5NIgdBw832G+u xg1Ra/+ME2UkpP4kyct5lKGL3StkY67z7uj5kJBbIJGYbWIhVvF/0diXAfQJQaXIeVlohE43+m5JM Y1a6S9Wg==; Received: from [2001:4bb8:19a:2039:eaa2:3b9e:be2e:bd2a] (helo=localhost) by bombadil.infradead.org with esmtpsa (Exim 4.94.2 #2 (Red Hat Linux)) id 1pHh5g-00DHhT-3G; Tue, 17 Jan 2023 08:13:08 +0000 From: Christoph Hellwig To: Jens Axboe , Tejun Heo , Josef Bacik Cc: linux-block@vger.kernel.org, cgroups@vger.kernel.org Subject: [PATCH 03/15] blk-cgroup: delay blk-cgroup initialization until add_disk Date: Tue, 17 Jan 2023 09:12:45 +0100 Message-Id: <20230117081257.3089859-4-hch@lst.de> X-Mailer: git-send-email 2.39.0 In-Reply-To: <20230117081257.3089859-1-hch@lst.de> References: <20230117081257.3089859-1-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 There is no need to initialize the group code before the disk is marked live. Moving the cgroup initialization earlier will help to have a fully initialized struct device in the gendisk for the cgroup code to use in the future. Similarly tear the cgroup information down in del_gendisk to be symmetric and because none of the cgroup tracking is needed once non-passthrough I/O stops. Signed-off-by: Christoph Hellwig --- block/genhd.c | 17 +++++++++-------- 1 file changed, 9 insertions(+), 8 deletions(-) diff --git a/block/genhd.c b/block/genhd.c index 23cf83b3331cde..705dec0800d62e 100644 --- a/block/genhd.c +++ b/block/genhd.c @@ -466,10 +466,14 @@ int __must_check device_add_disk(struct device *parent, struct gendisk *disk, */ pm_runtime_set_memalloc_noio(ddev, true); - ret = blk_integrity_add(disk); + ret = blkcg_init_disk(disk); if (ret) goto out_del_block_link; + ret = blk_integrity_add(disk); + if (ret) + goto out_blkcg_exit; + disk->part0->bd_holder_dir = kobject_create_and_add("holders", &ddev->kobj); if (!disk->part0->bd_holder_dir) { @@ -534,6 +538,8 @@ int __must_check device_add_disk(struct device *parent, struct gendisk *disk, kobject_put(disk->part0->bd_holder_dir); out_del_integrity: blk_integrity_del(disk); +out_blkcg_exit: + blkcg_exit_disk(disk); out_del_block_link: if (!sysfs_deprecated) sysfs_remove_link(block_depr, dev_name(ddev)); @@ -662,6 +668,8 @@ void del_gendisk(struct gendisk *disk) rq_qos_exit(q); blk_mq_unquiesce_queue(q); + blkcg_exit_disk(disk); + /* * If the disk does not own the queue, allow using passthrough requests * again. Else leave the queue frozen to fail all I/O. @@ -1171,8 +1179,6 @@ static void disk_release(struct device *dev) !test_bit(GD_ADDED, &disk->state)) blk_mq_exit_queue(disk->queue); - blkcg_exit_disk(disk); - bioset_exit(&disk->bio_split); disk_release_events(disk); @@ -1385,9 +1391,6 @@ struct gendisk *__alloc_disk_node(struct request_queue *q, int node_id, if (xa_insert(&disk->part_tbl, 0, disk->part0, GFP_KERNEL)) goto out_destroy_part_tbl; - if (blkcg_init_disk(disk)) - goto out_erase_part0; - rand_initialize_disk(disk); disk_to_dev(disk)->class = &block_class; disk_to_dev(disk)->type = &disk_type; @@ -1400,8 +1403,6 @@ struct gendisk *__alloc_disk_node(struct request_queue *q, int node_id, #endif return disk; -out_erase_part0: - xa_erase(&disk->part_tbl, 0); out_destroy_part_tbl: xa_destroy(&disk->part_tbl); disk->part0->bd_disk = NULL; -- 2.39.0