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auth/factotum: bound the number of srv processes to 16, error the 9p rpc when it is over limit

--- a/sys/src/cmd/auth/factotum/fs.c

+++ b/sys/src/cmd/auth/factotum/fs.c

@@ -491,6 +491,10 @@

 	fss = r->fid->aux;

 	srv = r->srv;

+	if(srv->sref.ref == 1 && srv->rref.ref > 16){

+		respond(r, "too much activity");

+		return;

+	}

 	srvrelease(srv);

 	qlock(fss);

 	if(r->ifcall.type == Tread)