query on VFS busy inode

Hello All, Can some one please help me to understand meaning of below code <snip> if (!list_empty <http://lxr.free-electrons.com/ident?i=list_empty>(&sb <http://lxr.free-electrons.com/ident?i=sb>->s_inodes)) {406 <http://lxr.free-electrons.com/source/fs/super.c#L406> printk <http://lxr.free-electrons.com/ident?i=printk>(*"VFS: Busy inodes after unmount of %s. "*407 <http://lxr.free-electrons.com/source/fs/super.c#L407> *"Self-destruct in 5 seconds. Have a nice day...\n"*,408 <http://lxr.free-electrons.com/source/fs/super.c#L408> sb <http://lxr.free-electrons.com/ident?i=sb>->s_id);409 <http://lxr.free-electrons.com/source/fs/super.c#L409> } </snip> Are we doing here? Thanks, Dave