On Fri, Jan 09, 2015 at 08:51:30AM -0800, Jeff Layton wrote: > Ok, it'd be good to document that in some comments then for the sake of > posterity (maybe it is later in the set -- I haven't gotten to the end > yet). What kinds of comments do you expect? Not implementing unused features of a protocol should be the default for anything in Linux. > Now, that said...I think that your ROC semantics are wrong here. You > also have to take delegations into account. [1] > > Basically the semantics that you want are that nfsd should do all of > the ROC stuff on last close iff there are no outstanding delegations or > on delegreturn iff there are no opens. > > What we ended up doing in the unreleased code we have was to create a > new per-client and per-file object (that we creatively called an > "odstate"). An open stateid and a delegation stateid would hold a > reference to this object which is put when those stateids are freed. > When its refcount goes to zero, then we'd free any outstanding layouts > on the file for that client and free the object. > > You probably want to do something similar here. > > [1]: Tom and Trond mentioned that there's a RFC5661 errata pending for > this, but I don't see it right offhand. It would be good to look at the errata. While the idea of keeping layouts around longer makes sense, I would only expect to do this if they layout state was created based on a delegation stateid, not a lock or open stateid. In that case having the layouts hang off the "parent" stateid might be another option. -- To unsubscribe from this list: send the line "unsubscribe linux-nfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
