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[RFC,v4,linux-next,12/19] ext4: remove block_device_ejected()

Message ID 20240222124555.2049140-13-yukuai1@huaweicloud.com (mailing list archive)
State New
Headers show
Series fs & block: remove bdev->bd_inode | expand

Commit Message

Yu Kuai Feb. 22, 2024, 12:45 p.m. UTC
From: Yu Kuai <yukuai3@huawei.com>

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 <yukuai3@huawei.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Reviewed-by: Christoph Hellwig <hch@lst.de>
 fs/ext4/super.c | 18 ------------------
 1 file changed, 18 deletions(-)
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diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index e487623f9456..2d82b9d4b079 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)
- * 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;
@@ -6176,8 +6160,6 @@  static int ext4_commit_super(struct super_block *sb)
 	if (!sbh)
 		return -EINVAL;
-	if (block_device_ejected(sb))
-		return -ENODEV;