Don't hold hash bucket lock when free a dentry. This should fix the ls hang on greenfield.
Don't hold hash bucket lock when free a dentry. This should fix the
ls hang on greenfield.

pscedu/slash2-stable,pscedu/slash2-stable,pscedu/slash2-stable,pscedu/slash2-stable,pscedu/slash2-stable,pscedu/slash2-stable,pscedu/slash2-stable