[nfsv4] GETDEVICEINFO returning ENOENT

[Olga Kornievskaia <[e-mail]>]

Hi folks,

Is there anything in the spec or elsewhere to let the client decide if
NFS4ERR_NOENT is a temporary or a permanent error for GETDEVICEINFO
operation?

Right now a linux client treats it as a temporary error and triggers a
GETDEVICEINFO call before every IO call (until it gets a positive
answer). The client then proceeds to do the operations against the
MDS. But shouldn't ENOENT be equivalent to LAYOUTUNAVAILABLE error
which the client treats like a bit more permanent error and doesn't
ask for a layout on every IO after failing. It would seem logical that
if ENOENT means the server doesn't know this deviceid which was gotten
from a layout then should the client throw away the layout and ask
again for the layout?

Thank you.