[OpenAFS] namei interface lockf buggy on Solaris (and probably HP-UX and AIX)

[Robert Banz]

> Right, only that for a correct flock() emulation you'd also have to  
> hold the necessary locks to prevent another thread from seeking  
> away between the two calls... ideally something that is independent  
> of the namei locking. And the code would gain in readability had  
> the ifdefs been packed into a macro or subroutine.
>
> In this precise context however, and without wiping cleaner than  
> clean: why spend yet another system call on something that nobody  
> cares about.

Hmm.  Would it be advisable to switch to using flock or fcntl-style  
lock calls on systems which support it for full-file-locks rather  
than do the seek()/lock()?  At least on Solaris, you should be able  
to do an fcntl-style lock specifying the whole file in an atomic step...

-rob