[NFS] Missing handling for NFS4ERR_OLD_STATEID in nfs4_handle_exception?

[Trond Myklebust]

On Thu, 2007-04-12 at 07:59 -0400, Jeff Layton wrote:

> This sounds sort of like addressing the symptom and not the real 
> problem, however. The real question ought to be why you're getting 
> OLD_STATEID errors back from the server here. There can be legit 
> reasons, but these errors ought to be fairly rare. I generally only have 
> seen them when processes are signalled while RPC requests are in flight.

OLD_STATEID usually occurs if an OPEN or an OPEN_DOWNGRADE gets sent
that changes the current stateid while a READ or WRITE to the same file
is in flight.

It is generally a rare event, and so it tends to be much easier to deal
with by simply resending the READ/WRITEs with the updated stateid rather
than adding an expensive locking scheme for excluding READ/WRITE while
the OPEN/OPEN_DOWNGRADE is in progress.

Cheers,
  Trond