From patchwork Sat Apr 6 09:09:16 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Yu Kuai X-Patchwork-Id: 13619749 Received: from dggsgout12.his.huawei.com (dggsgout12.his.huawei.com [45.249.212.56]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id EE75E2C868; Sat, 6 Apr 2024 09:17:49 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=45.249.212.56 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1712395072; cv=none; b=q8egXkNuWy9O8WAg30VHo6cnX2psNdHgBsITil9vuiVd6BcXNjKrF79y4JzP/23fziEFiBXH4LUxGWSNWazUYLiELTJhLAq/Mr5BIJspLmDCV23ElPP3eji6WgjQP1IQWUym7+L7Ccb0qc8cT82glZmRe4tsueBFLcAz0PE70UM= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1712395072; c=relaxed/simple; bh=zUIO1SUiCKW2XfTdRsFxc2S0V/jDhjXrjWEbfQuXH5E=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=NDLGy7VXIrG6oIa2hLXDiX+5v6BGbxnS/TIzbWh7hokZGMbJwMVFlu5u9JyHNzvIXtLkOs/ipAENhQHWS+T+AUj8lwC6emwMyed/EN9XXEx053EXYutORc+UDZKshEywK0Mc4Az2in1O/FnHJ7GKFSSVYh3MvEgA2+5l4GIq3f4= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=huaweicloud.com; spf=pass smtp.mailfrom=huaweicloud.com; arc=none smtp.client-ip=45.249.212.56 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=huaweicloud.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=huaweicloud.com Received: from mail.maildlp.com (unknown [172.19.163.216]) by dggsgout12.his.huawei.com (SkyGuard) with ESMTP id 4VBVBD3ZqZz4f3khj; Sat, 6 Apr 2024 17:17:40 +0800 (CST) Received: from mail02.huawei.com (unknown [10.116.40.112]) by mail.maildlp.com (Postfix) with ESMTP id 29EF51A0C9B; Sat, 6 Apr 2024 17:17:47 +0800 (CST) Received: from huaweicloud.com (unknown [10.175.104.67]) by APP1 (Coremail) with SMTP id cCh0CgAn+REyExFm0JDpJA--.50223S16; Sat, 06 Apr 2024 17:17:46 +0800 (CST) From: Yu Kuai To: jack@suse.cz, hch@lst.de, brauner@kernel.org, viro@zeniv.linux.org.uk, axboe@kernel.dk Cc: linux-fsdevel@vger.kernel.org, linux-block@vger.kernel.org, yi.zhang@huawei.com, yangerkun@huawei.com, yukuai3@huawei.com Subject: [PATCH vfs.all 12/26] ext4: remove block_device_ejected() Date: Sat, 6 Apr 2024 17:09:16 +0800 Message-Id: <20240406090930.2252838-13-yukuai1@huaweicloud.com> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20240406090930.2252838-1-yukuai1@huaweicloud.com> References: <20240406090930.2252838-1-yukuai1@huaweicloud.com> Precedence: bulk X-Mailing-List: linux-block@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-CM-TRANSID: cCh0CgAn+REyExFm0JDpJA--.50223S16 X-Coremail-Antispam: 1UD129KBjvJXoW7Kr4UGw1xJF1fWr48KFy3urg_yoW8tF1Up3 y3uw1fJrW8urn29ayxJr4xWry0qa92yay0gFyxur1Fgrn7JryIqF4ktr1Iya40vrZ3uw4F qF1UCrWxur1UCrDanT9S1TB71UUUUUUqnTZGkaVYY2UrUUUUjbIjqfuFe4nvWSU5nxnvy2 9KBjDU0xBIdaVrnRJUUUBSb4IE77IF4wAFF20E14v26rWj6s0DM7CY07I20VC2zVCF04k2 6cxKx2IYs7xG6rWj6s0DM7CIcVAFz4kK6r1j6r18M28IrcIa0xkI8VA2jI8067AKxVWUAV Cq3wA2048vs2IY020Ec7CjxVAFwI0_Xr0E3s1l8cAvFVAK0II2c7xJM28CjxkF64kEwVA0 rcxSw2x7M28EF7xvwVC0I7IYx2IY67AKxVWDJVCq3wA2z4x0Y4vE2Ix0cI8IcVCY1x0267 AKxVW8Jr0_Cr1UM28EF7xvwVC2z280aVAFwI0_GcCE3s1l84ACjcxK6I8E87Iv6xkF7I0E 14v26rxl6s0DM2AIxVAIcxkEcVAq07x20xvEncxIr21l5I8CrVACY4xI64kE6c02F40Ex7 xfMcIj6xIIjxv20xvE14v26r1j6r18McIj6I8E87Iv67AKxVWUJVW8JwAm72CE4IkC6x0Y z7v_Jr0_Gr1lF7xvr2IYc2Ij64vIr41lFIxGxcIEc7CjxVA2Y2ka0xkIwI1l42xK82IYc2 Ij64vIr41l4I8I3I0E4IkC6x0Yz7v_Jr0_Gr1lx2IqxVAqx4xG67AKxVWUJVWUGwC20s02 6x8GjcxK67AKxVWUGVWUWwC2zVAF1VAY17CE14v26r1q6r43MIIYrxkI7VAKI48JMIIF0x vE2Ix0cI8IcVAFwI0_Gr0_Xr1lIxAIcVC0I7IYx2IY6xkF7I0E14v26r4UJVWxJr1lIxAI cVCF04k26cxKx2IYs7xG6r1j6r1xMIIF0xvEx4A2jsIE14v26r4j6F4UMIIF0xvEx4A2js IEc7CjxVAFwI0_Gr1j6F4UJbIYCTnIWIevJa73UjIFyTuYvjxUFgAwUUUUU X-CM-SenderInfo: 51xn3trlr6x35dzhxuhorxvhhfrp/ From: Yu Kuai block_device_ejected() is added by commit bdfe0cbd746a ("Revert "ext4: remove block_device_ejected"") in 2015. At that time 'bdi->wb' is destroyed synchronized from del_gendisk(), hence if ext4 is still mounted, and then mark_buffer_dirty() will reference destroyed 'wb'. However, such problem doesn't exist anymore: - commit d03f6cdc1fc4 ("block: Dynamically allocate and refcount backing_dev_info") switch bdi to use refcounting; - commit 13eec2363ef0 ("fs: Get proper reference for s_bdi"), will grab additional reference of bdi while mounting, so that 'bdi->wb' will not be destroyed until generic_shutdown_super(). Hence remove this dead function block_device_ejected(). Signed-off-by: Yu Kuai Reviewed-by: Jan Kara Reviewed-by: Christoph Hellwig --- fs/ext4/super.c | 18 ------------------ 1 file changed, 18 deletions(-) diff --git a/fs/ext4/super.c b/fs/ext4/super.c index 3fce1b80c419..cf4666b04d2e 100644 --- a/fs/ext4/super.c +++ b/fs/ext4/super.c @@ -492,22 +492,6 @@ static void ext4_maybe_update_superblock(struct super_block *sb) schedule_work(&EXT4_SB(sb)->s_sb_upd_work); } -/* - * The del_gendisk() function uninitializes the disk-specific data - * structures, including the bdi structure, without telling anyone - * else. Once this happens, any attempt to call mark_buffer_dirty() - * (for example, by ext4_commit_super), will cause a kernel OOPS. - * This is a kludge to prevent these oops until we can put in a proper - * hook in del_gendisk() to inform the VFS and file system layers. - */ -static int block_device_ejected(struct super_block *sb) -{ - struct inode *bd_inode = sb->s_bdev->bd_inode; - struct backing_dev_info *bdi = inode_to_bdi(bd_inode); - - return bdi->dev == NULL; -} - static void ext4_journal_commit_callback(journal_t *journal, transaction_t *txn) { struct super_block *sb = journal->j_private; @@ -6168,8 +6152,6 @@ static int ext4_commit_super(struct super_block *sb) if (!sbh) return -EINVAL; - if (block_device_ejected(sb)) - return -ENODEV; ext4_update_super(sb);