From patchwork Tue Nov 15 14:10:51 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Yu Kuai X-Patchwork-Id: 13043739 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 3C936C4332F for ; Tue, 15 Nov 2022 13:49:42 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S238313AbiKONtk (ORCPT ); Tue, 15 Nov 2022 08:49:40 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:49698 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231163AbiKONth (ORCPT ); Tue, 15 Nov 2022 08:49:37 -0500 Received: from dggsgout12.his.huawei.com (unknown [45.249.212.56]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 0E12424F35; Tue, 15 Nov 2022 05:49:34 -0800 (PST) Received: from mail02.huawei.com (unknown [172.30.67.153]) by dggsgout12.his.huawei.com (SkyGuard) with ESMTP id 4NBSGK0N6Sz4f41hQ; Tue, 15 Nov 2022 21:49:29 +0800 (CST) Received: from huaweicloud.com (unknown [10.175.127.227]) by APP4 (Coremail) with SMTP id gCh0CgBni9jnmHNjrPFIAg--.61645S11; Tue, 15 Nov 2022 21:49:32 +0800 (CST) From: Yu Kuai To: hch@lst.de, axboe@kernel.dk, agk@redhat.com, snitzer@kernel.org, dm-devel@redhat.com Cc: linux-block@vger.kernel.org, linux-kernel@vger.kernel.org, yukuai3@huawei.com, yukuai1@huaweicloud.com, yi.zhang@huawei.com Subject: [PATCH v3 07/10] block: remove delayed holder registration Date: Tue, 15 Nov 2022 22:10:51 +0800 Message-Id: <20221115141054.1051801-8-yukuai1@huaweicloud.com> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20221115141054.1051801-1-yukuai1@huaweicloud.com> References: <20221115141054.1051801-1-yukuai1@huaweicloud.com> MIME-Version: 1.0 X-CM-TRANSID: gCh0CgBni9jnmHNjrPFIAg--.61645S11 X-Coremail-Antispam: 1UD129KBjvJXoW3GF1DZFyUur4fZr4rGryfZwb_yoW7Zr13pF W5GFWxtrW8JF4DuF4qqw47XF1Ygw1jg3WxCFWfKryI9rZxAr4v9F13Jry7XFyrtr92gF43 tF45XrWY9F10krJanT9S1TB71UUUUUUqnTZGkaVYY2UrUUUUjbIjqfuFe4nvWSU5nxnvy2 9KBjDU0xBIdaVrnRJUUUPF14x267AKxVWrJVCq3wAFc2x0x2IEx4CE42xK8VAvwI8IcIk0 rVWrJVCq3wAFIxvE14AKwVWUJVWUGwA2048vs2IY020E87I2jVAFwI0_JF0E3s1l82xGYI kIc2x26xkF7I0E14v26ryj6s0DM28lY4IEw2IIxxk0rwA2F7IY1VAKz4vEj48ve4kI8wA2 z4x0Y4vE2Ix0cI8IcVAFwI0_tr0E3s1l84ACjcxK6xIIjxv20xvEc7CjxVAFwI0_Gr1j6F 4UJwA2z4x0Y4vEx4A2jsIE14v26rxl6s0DM28EF7xvwVC2z280aVCY1x0267AKxVW0oVCq 3wAS0I0E0xvYzxvE52x082IY62kv0487Mc02F40EFcxC0VAKzVAqx4xG6I80ewAv7VC0I7 IYx2IY67AKxVWUJVWUGwAv7VC2z280aVAFwI0_Jr0_Gr1lOx8S6xCaFVCjc4AY6r1j6r4U M4x0Y48IcxkI7VAKI48JM4x0x7Aq67IIx4CEVc8vx2IErcIFxwACI402YVCY1x02628vn2 kIc2xKxwCF04k20xvY0x0EwIxGrwCFx2IqxVCFs4IE7xkEbVWUJVW8JwC20s026c02F40E 14v26r1j6r18MI8I3I0E7480Y4vE14v26r106r1rMI8E67AF67kF1VAFwI0_Jw0_GFylIx kGc2Ij64vIr41lIxAIcVC0I7IYx2IY67AKxVWUCVW8JwCI42IY6xIIjxv20xvEc7CjxVAF wI0_Cr0_Gr1UMIIF0xvE42xK8VAvwI8IcIk0rVWUJVWUCwCI42IY6I8E87Iv67AKxVWUJV W8JwCI42IY6I8E87Iv6xkF7I0E14v26r4j6r4UJbIYCTnIWIevJa73UjIFyTuYvjfUOBTY UUUUU X-CM-SenderInfo: 51xn3trlr6x35dzhxuhorxvhhfrp/ X-CFilter-Loop: Reflected Precedence: bulk List-ID: X-Mailing-List: linux-block@vger.kernel.org From: Christoph Hellwig Now that dm has been fixed to track of holder registrations before add_disk, the somewhat buggy block layer code can be safely removed. Signed-off-by: Christoph Hellwig Signed-off-by: Yu Kuai --- block/genhd.c | 4 --- block/holder.c | 72 ++++++++++++------------------------------ include/linux/blkdev.h | 5 --- 3 files changed, 21 insertions(+), 60 deletions(-) diff --git a/block/genhd.c b/block/genhd.c index e9501c66ba4d..dcf200bcbd3e 100644 --- a/block/genhd.c +++ b/block/genhd.c @@ -479,10 +479,6 @@ int __must_check device_add_disk(struct device *parent, struct gendisk *disk, goto out_put_holder_dir; } - ret = bd_register_pending_holders(disk); - if (ret < 0) - goto out_put_slave_dir; - ret = blk_register_queue(disk); if (ret) goto out_put_slave_dir; diff --git a/block/holder.c b/block/holder.c index 5283bc804cc1..dd9327b43ce0 100644 --- a/block/holder.c +++ b/block/holder.c @@ -29,19 +29,6 @@ static void del_symlink(struct kobject *from, struct kobject *to) sysfs_remove_link(from, kobject_name(to)); } -static int __link_disk_holder(struct block_device *bdev, struct gendisk *disk) -{ - int ret; - - ret = add_symlink(disk->slave_dir, bdev_kobj(bdev)); - if (ret) - return ret; - ret = add_symlink(bdev->bd_holder_dir, &disk_to_dev(disk)->kobj); - if (ret) - del_symlink(disk->slave_dir, bdev_kobj(bdev)); - return ret; -} - /** * bd_link_disk_holder - create symlinks between holding disk and slave bdev * @bdev: the claimed slave bdev @@ -75,6 +62,9 @@ int bd_link_disk_holder(struct block_device *bdev, struct gendisk *disk) struct bd_holder_disk *holder; int ret = 0; + if (WARN_ON_ONCE(!disk->slave_dir)) + return -EINVAL; + mutex_lock(&disk->open_mutex); WARN_ON_ONCE(!bdev->bd_holder); @@ -94,34 +84,32 @@ int bd_link_disk_holder(struct block_device *bdev, struct gendisk *disk) INIT_LIST_HEAD(&holder->list); holder->bdev = bdev; holder->refcnt = 1; - if (disk->slave_dir) { - ret = __link_disk_holder(bdev, disk); - if (ret) { - kfree(holder); - goto out_unlock; - } - } - + ret = add_symlink(disk->slave_dir, bdev_kobj(bdev)); + if (ret) + goto out_free_holder; + ret = add_symlink(bdev->bd_holder_dir, &disk_to_dev(disk)->kobj); + if (ret) + goto out_del_symlink; list_add(&holder->list, &disk->slave_bdevs); + /* * del_gendisk drops the initial reference to bd_holder_dir, so we need * to keep our own here to allow for cleanup past that point. */ kobject_get(bdev->bd_holder_dir); + mutex_unlock(&disk->open_mutex); + return 0; +out_del_symlink: + del_symlink(disk->slave_dir, bdev_kobj(bdev)); +out_free_holder: + kfree(holder); out_unlock: mutex_unlock(&disk->open_mutex); return ret; } EXPORT_SYMBOL_GPL(bd_link_disk_holder); -static void __unlink_disk_holder(struct block_device *bdev, - struct gendisk *disk) -{ - del_symlink(disk->slave_dir, bdev_kobj(bdev)); - del_symlink(bdev->bd_holder_dir, &disk_to_dev(disk)->kobj); -} - /** * bd_unlink_disk_holder - destroy symlinks created by bd_link_disk_holder() * @bdev: the calimed slave bdev @@ -136,11 +124,14 @@ void bd_unlink_disk_holder(struct block_device *bdev, struct gendisk *disk) { struct bd_holder_disk *holder; + if (WARN_ON_ONCE(!disk->slave_dir)) + return; + mutex_lock(&disk->open_mutex); holder = bd_find_holder_disk(bdev, disk); if (!WARN_ON_ONCE(holder == NULL) && !--holder->refcnt) { - if (disk->slave_dir) - __unlink_disk_holder(bdev, disk); + del_symlink(disk->slave_dir, bdev_kobj(bdev)); + del_symlink(bdev->bd_holder_dir, &disk_to_dev(disk)->kobj); kobject_put(bdev->bd_holder_dir); list_del_init(&holder->list); kfree(holder); @@ -148,24 +139,3 @@ void bd_unlink_disk_holder(struct block_device *bdev, struct gendisk *disk) mutex_unlock(&disk->open_mutex); } EXPORT_SYMBOL_GPL(bd_unlink_disk_holder); - -int bd_register_pending_holders(struct gendisk *disk) -{ - struct bd_holder_disk *holder; - int ret; - - mutex_lock(&disk->open_mutex); - list_for_each_entry(holder, &disk->slave_bdevs, list) { - ret = __link_disk_holder(holder->bdev, disk); - if (ret) - goto out_undo; - } - mutex_unlock(&disk->open_mutex); - return 0; - -out_undo: - list_for_each_entry_continue_reverse(holder, &disk->slave_bdevs, list) - __unlink_disk_holder(holder->bdev, disk); - mutex_unlock(&disk->open_mutex); - return ret; -} diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h index 9188aa3f6259..516e45246868 100644 --- a/include/linux/blkdev.h +++ b/include/linux/blkdev.h @@ -833,7 +833,6 @@ void set_capacity(struct gendisk *disk, sector_t size); #ifdef CONFIG_BLOCK_HOLDER_DEPRECATED int bd_link_disk_holder(struct block_device *bdev, struct gendisk *disk); void bd_unlink_disk_holder(struct block_device *bdev, struct gendisk *disk); -int bd_register_pending_holders(struct gendisk *disk); #else static inline int bd_link_disk_holder(struct block_device *bdev, struct gendisk *disk) @@ -844,10 +843,6 @@ static inline void bd_unlink_disk_holder(struct block_device *bdev, struct gendisk *disk) { } -static inline int bd_register_pending_holders(struct gendisk *disk) -{ - return 0; -} #endif /* CONFIG_BLOCK_HOLDER_DEPRECATED */ dev_t part_devt(struct gendisk *disk, u8 partno);