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From: Jens Staal <staal1978@gmail.com>
Date: Tue,  4 Oct 2011 21:51:18 +0200
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To: Fans of the OS Plan 9 from Bell Labs <9fans@9fans.net>
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Subject: Re: [9fans] copying over 9P using plan9port
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2011/10/4 Russ Cox <rsc@swtch.com>:
> To answer my question: the error message comes from 9pfuse.
> The extra bits are O_NOFOLLOW and O_LARGEFILE, both of
> which seem harmless in this context. =C2=A0Try this:
>
>
> diff -r 6db8fc2588f6 src/cmd/9pfuse/main.c
> --- a/src/cmd/9pfuse/main.c =C2=A0 =C2=A0 Mon Oct 03 18:16:09 2011 -0400
> +++ b/src/cmd/9pfuse/main.c =C2=A0 =C2=A0 Tue Oct 04 15:43:16 2011 -0400
> @@ -577,6 +577,13 @@
> =C2=A0 =C2=A0 =C2=A0 =C2=A0openmode =3D flags&3;
> =C2=A0 =C2=A0 =C2=A0 =C2=A0flags &=3D ~3;
> =C2=A0 =C2=A0 =C2=A0 =C2=A0flags &=3D ~(O_DIRECTORY|O_NONBLOCK|O_LARGEFIL=
E|O_CLOEXEC);
> +#ifdef O_NOFOLLOW
> + =C2=A0 =C2=A0 =C2=A0 flags &=3D ~O_NOFOLLOW
> +#endif
> +#ifdef O_LARGEFILE
> + =C2=A0 =C2=A0 =C2=A0 flags &=3D ~O_LARGEFILE
> +#endif
> +
> =C2=A0 =C2=A0 =C2=A0 =C2=A0/*
> =C2=A0 =C2=A0 =C2=A0 =C2=A0 * Discarding O_APPEND here is not completely =
wrong,
> =C2=A0 =C2=A0 =C2=A0 =C2=A0 * because the host kernel will rewrite the of=
fsets
> @@ -594,7 +601,7 @@
> =C2=A0 =C2=A0 =C2=A0 =C2=A0 * =C2=A0 =C2=A0 =C2=A0O_NONBLOCK -> ONONBLOCK
> =C2=A0 =C2=A0 =C2=A0 =C2=A0 */
> =C2=A0 =C2=A0 =C2=A0 =C2=A0if(flags){
> - =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 fprint(2, "unexpected =
open flags %#uo", (uint)in->flags);
> + =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 fprint(2, "unexpected =
open flags %#uo\n", (uint)in->flags);
> =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0replyfuseerrno(m, =
EACCES);
> =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0return;
> =C2=A0 =C2=A0 =C2=A0 =C2=A0}
>
>

Thanks I will try the patch as soon as I got time.

@ brian:

doing "cp -r" instead of "cp -ar" did not make a difference