Re: [NFS] Missing handling for NFS4ERR_OLD_STATEID in nfs4_handle_exception?

[Jeff Layton <jlayton@poochiereds.net>]

Trond Myklebust wrote:
> 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
> 

Ahh that makes sense. I must have misunderstood the circumstances where 
I was seeing it. Thanks for clarifying.

-- Jeff