[PATCH 5/5] fs: assert that open_mutex isn't held over holder ops

[Christoph Hellwig <hch@lst.de>]

From: Christian Brauner <brauner@kernel.org>

With recent block level changes we should never be in a situation where
we hold disk->open_mutex when calling into these helpers. So assert that
in the code.

Signed-off-by: Christian Brauner <brauner@kernel.org>
Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 fs/super.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/fs/super.c b/fs/super.c
index 26b96191e9b3ca..ce54cfcecaa156 100644
--- a/fs/super.c
+++ b/fs/super.c
@@ -1443,6 +1443,7 @@ static void fs_bdev_mark_dead(struct block_device *bdev, bool surprise)
 
 	/* bd_holder_lock ensures that the sb isn't freed */
 	lockdep_assert_held(&bdev->bd_holder_lock);
+	lockdep_assert_not_held(&bdev->bd_disk->open_mutex);
 
 	if (!super_lock_shared_active(sb))
 		return;
@@ -1462,6 +1463,7 @@ static void fs_bdev_sync(struct block_device *bdev)
 	struct super_block *sb = bdev->bd_holder;
 
 	lockdep_assert_held(&bdev->bd_holder_lock);
+	lockdep_assert_not_held(&bdev->bd_disk->open_mutex);
 
 	if (!super_lock_shared_active(sb))
 		return;
-- 
2.39.2