Re: NFS_UNSTABLE vs. FILE and DATA sync.

[Chuck Lever <chuck.lever@oracle.com>]

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Wim Colgate wrote:
> If I have a soft mount, and open a file with O_DIRECT and O_SYNC, should 
> I ever expect a callback (nfs_writeback_done) with a successful 
> task->tk_status (i.e >= 0) with the committed state 
> (resp->verf->committed) set to NFS_UNSTABLE?

Yes, this can happen if the server decides to return NFS_UNSTABLE. 
Rare, but possible.

> A secondary question: if the above is expected, does this occur because 
> someone is caching the write and is there a mechanism to disable this 
> effect?

Servers can return NFS_UNSTABLE to any WRITE request, so I can't think 
of a way this might be disabled.

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