function associates a vnode with a mount.
This includes updating
for the vnode, and inserting the vnode into the mounts vnode list.
The mount reference count is incremented for each vnode added to the
mount, and that reference is decremented by
The mounts interlock is held while the vnode is inserted.
For MP-safe file systems, the vnode must be exclusively locked.
on the supplied vnode, and then drops the vnode lock and reference.
If more elaborated cleanup after
failure is needed, the
function may be used instead.
argument is a pointer to a function that is called on failure.
This function may perform any custom cleanup.
The vnode pointer is supplied as the first argument to
argument is the second, supplying any additional context needed.