[PATCH 13/17] watch_queue: Implement mount topology and attribute change notifications [ver #5]

[David Howells]

Miklos Szeredi <miklos at szeredi.hu> wrote:

> OTOH mount notification is way smaller and IMO a more mature
> interface.  So just picking the unique ID patch into this set might
> make sense.

But userspace can't retrieve the unique ID without fsinfo() as things stand.

I'm changing it so that the fields are 64-bit, but initialised with the
existing mount ID in the notifications set.  The fsinfo set changes that to a
unique ID.  I'm tempted to make the unique IDs start at UINT_MAX+1 to
disambiguate them.

David