[PATCH 003 of 11] knfsd: call lockd_down when closing a socket via a write to nfsd/portlist

[NeilBrown <neilb@suse.de>]

The refcount that nfsd holds on lockd is based on the number
of open sockets.
So when we close a socket, we should decrement the ref (with lockd_down).

Currently when a socket is closed via writing to the portlist
file, that doesn't happen.

So: make sure we get an error return if the socket that was requested
does is not found, and call lockd_down if it was.

Cc: "J. Bruce Fields" <bfields@fieldses.org>
Signed-off-by: Neil Brown <neilb@suse.de>

### Diffstat output
 ./fs/nfsd/nfsctl.c     |    2 ++
 ./net/sunrpc/svcsock.c |    2 ++
 2 files changed, 4 insertions(+)

diff .prev/fs/nfsd/nfsctl.c ./fs/nfsd/nfsctl.c
--- .prev/fs/nfsd/nfsctl.c	2006-08-24 16:24:21.000000000 +1000
+++ ./fs/nfsd/nfsctl.c	2006-08-24 16:24:21.000000000 +1000
@@ -545,6 +545,8 @@ static ssize_t write_ports(struct file *
 		if (nfsd_serv)
 			len = svc_sock_names(buf, nfsd_serv, toclose);
 		unlock_kernel();
+		if (len >= 0)
+			lockd_down();
 		kfree(toclose);
 		return len;
 	}

diff .prev/net/sunrpc/svcsock.c ./net/sunrpc/svcsock.c
--- .prev/net/sunrpc/svcsock.c	2006-08-24 16:23:37.000000000 +1000
+++ ./net/sunrpc/svcsock.c	2006-08-24 16:24:21.000000000 +1000
@@ -493,6 +493,8 @@ svc_sock_names(char *buf, struct svc_ser
 	spin_unlock(&serv->sv_lock);
 	if (closesk)
 		svc_delete_socket(closesk);
+	else if (toclose)
+		return -ENOENT;
 	return len;
 }
 EXPORT_SYMBOL(svc_sock_names);