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

[David Howells]

Ian Kent <raven at themaw.net> wrote:

> > 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.
> 
> Mmm ... so what would I use as a mount id that's not used, like NULL
> for strings?

Zero is skipped, so you could use that.

> I'm using -1 now but changing this will mean I need something
> different.

It's 64-bits, so you're not likely to see it reach -1, even if it does start
at UINT_MAX+1.

David