nfsd: add a usermodehelper upcall for NFSv4 client ID tracking
authorJeff Layton <jlayton@redhat.com>
Mon, 12 Nov 2012 20:00:48 +0000 (15:00 -0500)
committerJ. Bruce Fields <bfields@redhat.com>
Mon, 12 Nov 2012 23:55:10 +0000 (18:55 -0500)
Add a new client tracker upcall type that uses call_usermodehelper to
call out to a program. This seems to be the preferred method of
calling out to usermode these days for seldom-called upcalls. It's
simple and doesn't require a running daemon, so it should "just work"
as long as the binary is installed.

The client tracking exit operation is also changed to check for a
NULL pointer before running. The UMH upcall doesn't need to do anything
at module teardown time.

Signed-off-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>

No differences found