tree 5e96e63fd69303162456549f12bff5f9b2ee2a22
parent da77005f0d64486cd760f43d9b7cc2379262a363
author Trond Myklebust <Trond.Myklebust@netapp.com> 1249845269 -0400
committer Trond Myklebust <Trond.Myklebust@netapp.com> 1249845269 -0400

SUNRPC: Allow the cache_detail to specify alternative upcall mechanisms

For events that are rare, such as referral DNS lookups, it makes limited
sense to have a daemon constantly listening for upcalls on a channel. An
alternative in those cases might simply be to run the app that fills the
cache using call_usermodehelper_exec() and friends.

The following patch allows the cache_detail to specify alternative upcall
mechanisms for these particular cases.

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>