> The thing is that I want to access the generation number from
> userland to write a regression test for tmpfs.  The test should
> verify that when a node is reused, it gets a different number.
> But there is actually no way to write this.

what you want to verify is filehandle uniqueness, isn't it?
if so, how about using getfh instead?

> Is the attached patch correct?  Any objections in adding this feature?

i object because the "feature" is somewhat pointless.

YAMAMOTO Takashi