On Thu, Mar 8, 2012 at 3:50 PM, Myklebust, Trond <Trond.Myklebust@xxxxxxxxxx> wrote: > On Thu, 2012-03-08 at 15:42 -0500, J. Bruce Fields wrote: >> On Thu, Mar 08, 2012 at 03:23:34PM -0500, Olga Kornievskaia wrote: >> > On Thu, Mar 8, 2012 at 1:15 PM, Myklebust, Trond >> > <Trond.Myklebust@xxxxxxxxxx> wrote: >> > > On Thu, 2012-03-08 at 12:52 -0500, Olga Kornievskaia wrote: >> > >> wouldn't it be better for you to proactively return a read delegation >> > >> then unnecessarily erroring? >> > > >> > > If nobody else holds a delegation, then the NFS client is actually >> > > allowed to keep its read delegation while writing to the file. It does >> > > admittedly need to request an OPEN stateid for write in that case... >> > > (See section 10.4 of RFC3530bis draft 16) >> > >> > If we both agree that there has to be a request for an open stateid for >> > a write, then instead of returning the read delegation if the client receives >> > err_openmode (when it send the request with read delegation stateid >> > as you said per 3560bis), can't the client resend the setattr with the open >> > stateid? The ordering of the stateid usage is a "should" and not a "must". >> > >> > In rfc5661, it really doesn't make sense to ever send a setattr with >> > a read delegation stateid. According to 9.1.2, the server "MUST" return >> > err_open_mode" error in that case. >> > >> > I gather you are in this case dealing with 4.0 delegations. But I wonder >> > if you'll do something else for 4.1 delegation then? >> >> 3530bis has the same language ("...must verify that the access mode >> allows writing and return an NFS4ERR_OPENMODE error if it does not"). > > OK, so we shouldn't send the delegation stateid either for v4 or v4.1. > However should we pre-emptively return the delegation? I've been > assuming not. It would be nice not to pre-emptively return delegations but for that we need server implementors to get on board with the idea. -- To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html