Re: SMP/cc Cluster description

Alexander Viro
2001-12-06T22:49:55Z

On Thu, 6 Dec 2001, Larry McVoy wrote:

> I'm not sure what the point is. We've already agreed that the multiple OS
> instances will have synchonization to do for file operations, ftruncate
> being one of them.

That's nice. But said operation involves serious wanking with metadata
and _that_ would better have exclusion with write(2) and some warranties
about pageouts.

You can do lockless get_block() and truncate(). And it will be a hive
of races always ready to break out. We used to try that and it was
a fscking mess of unbelievable proportions - worse than that in full-blown
rename() support.