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lib9p: limit the number of srv processes kept arround 8

--- a/sys/include/9p.h

+++ b/sys/include/9p.h

@@ -236,6 +236,8 @@

 	Ref	sref;	/* srvwork procs */

 	Ref	rref;	/* requests in flight */

+	int	spid;	/* pid of srv() caller */

+

 	void	(*free)(Srv*);

 };

--- a/sys/src/lib9p/srv.c

+++ b/sys/src/lib9p/srv.c

@@ -748,6 +748,11 @@

 		case Tstat:	sstat(srv, r);	break;

 		case Twstat:	swstat(srv, r);	break;

 		}

+		if(srv->sref.ref > 8 && srv->spid != getpid()){

+			decref(&srv->sref);

+			qunlock(&srv->slock);

+			return;

+		}

 		qunlock(&srv->slock);

 	}

@@ -803,6 +808,7 @@

 	fmtinstall('D', dirfmt);

 	fmtinstall('F', fcallfmt);

+	srv->spid = getpid();

 	srv->sref.ref = 0;

 	srv->rref.ref = 0;