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

On Mon, 2020-08-03 at 13:31 +0100, David Howells wrote:

Ian Kent [off-list ref] wrote:

quoted

quoted

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.

quoted

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.

Ha, either or, I don't think it will be a problem, there's
bound to be a few changes so the components using this will
need to change a bit before it's finalized, shouldn't be a
big deal I think. At least not for me and shouldn't be much
for libmount either I think.

Ian