Re: [9fans] u9fs

["Ronald G. Minnich" <rminnich@lanl.gov>]

On Tue, 18 Feb 2003, Russ Cox wrote:

> The only use of the attach spec in u9fs is that if you attach
> to the name "device" then you can access devices
> on the system.  Otherwise you're not allowed, so as
> to avoid blocking the (single-threaded) server.

ah, that is interesting. This is what happens when you re-do an
implementation from the man pages.

We actually make different use of the attach spec here. It lets you
restrict the domain of the server by basically making a fid for the attach
lower in the tree than '/'.

I guess I'll get the same effect by chroot'ing the server.

It's interesting seeing how much I did the same as Plan 9 from the man
pages, and how many little differences like this have crept in. I've been
using that attach spec for years (and truth to tell, I still like it, but
I'm going to stick with stock u9fs).

I ran into this just now for this reason: I am running v9fs2k (linux vfs
client for 9p2000) on the same laptop as u9fs. I am getting readdir
working.  The mount point for v9fs2k is /mnt. Things got messy when the
server walked over /mnt ... as in deadlock. I never had this type of thing
with my old 9p server that I wrote, since the attaches were always below
root.

Anyway, an easy workaround.

thanks

ron