nfsd: allow passing in array of thread counts via netlink

Now that nfsd_svc can handle an array of thread counts, fix up the
netlink threads interface to construct one from the netlink call
and pass it through so we can start a pooled server the same way we
would start a normal one.

Note that any unspecified values in the array are considered zeroes,
so it's possible to shut down a pooled server by passing in a short
array that has only zeros, or even an empty array.

Signed-off-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>

1 files changed, 11 insertions, 1 deletions

diff --git a/fs/nfsd/nfssvc.c b/fs/nfsd/nfssvc.c
index 9aa23762394b..0bc8eaa5e009 100644
--- a/fs/nfsd/nfssvc.c
+++ b/fs/nfsd/nfssvc.c
@@ -769,8 +769,18 @@ int nfsd_set_nrthreads(int n, int *nthreads, struct net *net)
 					  &nn->nfsd_serv->sv_pools[i],
 					  nthreads[i]);
 		if (err)
-			break;
+			goto out;
 	}
+
+	/* Anything undefined in array is considered to be 0 */
+	for (i = n; i < nn->nfsd_serv->sv_nrpools; ++i) {
+		err = svc_set_num_threads(nn->nfsd_serv,
+					  &nn->nfsd_serv->sv_pools[i],
+					  0);
+		if (err)
+			goto out;
+	}
+out:
 	return err;
 }