Re: VFS + path walktrough

[Miklos Szeredi]

> > > >  Take a look at 9P walk - it does *not* give
> > > > you anything resembling stat, you just get qids of intermediates.
> > > 
> > > Which is exactly what's needed to populate the dentry tree, no?
> > 
> > No - you need inodes as well (i.e. as the absolute least you want
> > mode and ownership).  Which is to say, you need to issue stat on
> > each component in such situation anyway.  Not a win...

And actually even that *could* be a win, if the network latency is
large.  Because by doing the lookup first, the stats can be performed
in parallel.  So a path with an arbitrary number of components could
be resolved in just 2 RTTs.

Miklos
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