On Oct 20, 2010, at 3:17 AM, Neil Brown wrote: > > > If I don't have any network configured (except loop-back), and try an NFSv3 > mount, then it fails quickly: > > > .... > mount.nfs: portmap query failed: RPC: Remote system error - Network is unreachable > mount.nfs: Network is unreachable > > > If I try the same thing with a NFSv4 mount, it times out before it fails, > making a much longer delay. > > This is because mount.nfs doesn't do a portmap lookup but just leaves > everything to the kernel. > The kernel does an 'rpc_ping()' which sets RPC_TASK_SOFTCONN. > So at least it doesn't retry after the timeout. But given that we have a > clear error, we shouldn't timeout at all. > > Unfortunately I cannot see an easy way to fix this. > > The place where ENETUNREACH is in xs_tcp_setup_socket. The comment there > says "Retry with the same socket after a delay". The "delay" bit is correct, > the "retry" isn't. > > It would seem that we should just add a 'goto out' there if RPC_TASK_SOFTCONN > was set. However we cannot see the task at this point - in fact it seems > that there could be a queue of tasks waiting on this connection. I guess > some could be soft, and some not. ??? > > So: An suggestions how to get a ENETUNREACH (or ECONNREFUSED or similar) to > fail immediately when RPC_TASK_SOFTCONN is set ??? ECONNREFUSED should already fail immediately in this case. If it's not failing immediately, that's a bug. I agree that ENETUNREACH seems appropriate for quick failure if RPC_TASK_SOFTCONN is set. (I thought it already worked this way, but maybe I'm mistaken). > This affects people who upgrade from openSUSE11.2 (which didn't support v4 > mounts) to openSUSE11.3 (which defaults to v4) and who use network-manager > (which configures networks late) and have NFS mounts in /etc/fstab with > either explicit IP addresses or host names that can be resolved without the > network. > This config will work because when the network comes up, network-manager will > re-run the 'init.d/nfs' script. However since 11.3 there is an unpleasant > pause before boot completes. -- chuck[dot]lever[at]oracle[dot]com -- 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
