tree 15e0cf4514999c4fb9596adece9e22adfaee2a31
parent 012da158f636347c4eb28fd1e1cca020fef5e54d
author Chuck Lever <chuck.lever@oracle.com> 1259873936 -0500
committer Trond Myklebust <Trond.Myklebust@netapp.com> 1259873936 -0500

SUNRPC: Use soft connect semantics when performing RPC ping

Currently, if a remote RPC service is unreachable, an RPC ping will
hang until the underlying transport connect attempt times out.  A more
desirable behavior might be to have the ping fail immediately so upper
layers can recover appropriately.

In the case of an NFS mount, for instance, this would mean the
mount(2) system call could fail immediately if the server isn't
listening, rather than hanging uninterruptibly for more than 3
minutes.

Change rpc_ping() so that it fails immediately for connection-oriented
transports.  rpc_create() will then fail immediately for such
transports if an RPC ping was requested.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>