svn commit: r192463 - head/sys/fs/nfsserver

Rick Macklem rmacklem at
Wed May 20 21:35:30 UTC 2009

On Wed, 20 May 2009, Juli Mallett wrote:

> When client ids have been run out of, does that put something into a
> dangerous state (insecure or crash-prone)?  Isn't it better to let the
> administrator make the decision of when to reboot the machine?
Well, first off, this will "never" happen in practice. the clientid
generator is a 32bit unsigned, which means it will wrap around in 13.6
years if there is an average rate of 10 new clientids/sec. Since a new
clientid only typically happens once per mount (some clients might even
do less), it seems highly unlikely that an "average rate of 10/sec"
could happen even on the busiest server with clients doing short term
mounts. (There was talk of a client inside a web browser, but I don't
know that it has ever been written.)

When the 32bit # wraps around, rebooting would be the only solution,
since re-issuing the same clientid is verboten by the RFC.

If it was something I will see happen in my lifetime, I would be more
concerned about it.

The only reason I put it in is so no one can argue I can violate the RFC.

Have fun, rick

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