Re: [9fans] 9pserve question

[Russ Cox <rsc@swtch.com>]

> why does 9pserve.c:451
>
>                 case Topenfd:
>                         if(m->tx.mode&~(OTRUNC|3)){
>                                 err(m, "bad openfd mode");
>                                 continue;
>                         }
>
> dissallow OTRUNC?

Because it doesn't make sense.  Trust me on this.
That's case Topenfd not case Topen.  See the
description of openfd in the 9pclient(3) man page.

Topenfd is a special message only recognized by
9pserve and only emitted by the 9pclient library.
It's not used by anything else.

> this means that
>
> ; mount $home/9/upasfs
> ; echo delete mbox 24 > $home/9/upasfs/ctl
>
> and
>
> ; mount $home/9/factotum
> ; echo delkey > $home/9/factotum/ctl
>
> don't work. you need to replace '>' with '>>'.

I can't imagine why mounting (presumably this is Linux)
would cause the kernel to issue Topenfds.  Your
problem is probably elsewhere.  Perhaps the v9fs
module is sending a Tcreate and then when that fails
not trying a Topen OTRUNC as a fallback.

If you set verbose9pserve=1 in your environment
before starting one of these programs, then you can
see the messages going in and out.

Russ