for DOS "hidden" and &quo=
t;system" attributes was implemented in=C2=A0c5d72=
d29fe0e1a6ac1aaf622d8c4a6ca9422517a=C2=A0(this is in the NFSv4.1 specif=
ication) and ZFS supports both attributes via named attributes=
=C2=A0and therefore reports _PC_HAS_HIDDENSYSTEM and NFS server uses that t=
o decide whether to report this feature.
I'm not sure why this t=
ranslates to EPERM for writes, however. My earlier theory is that we transl=
ate it to SF_IMMUTABLE somehow, but looking at the code it doesn't appe=
ar to be the case :-/=C2=A0 Rick may be able to shed some light on this, th=
ough.
Cheers,
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