lib9p: limit the number of srv processes kept arround 8

2 files changed, 8 insertions, 0 deletions

diff --git a/sys/include/9p.h b/sys/include/9p.h
index 299d4316a..22d64c57f 100644
--- a/sys/include/9p.h
+++ b/sys/include/9p.h
@@ -236,6 +236,8 @@ struct Srv {
 	Ref	sref;	/* srvwork procs */
 	Ref	rref;	/* requests in flight */
 
+	int	spid;	/* pid of srv() caller */
+
 	void	(*free)(Srv*);
 };
 
diff --git a/sys/src/lib9p/srv.c b/sys/src/lib9p/srv.c
index 898961cab..779af8dd0 100644
--- a/sys/src/lib9p/srv.c
+++ b/sys/src/lib9p/srv.c
@@ -748,6 +748,11 @@ srvwork(void *v)
 		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 @@ srv(Srv *srv)
 	fmtinstall('D', dirfmt);
 	fmtinstall('F', fcallfmt);
 
+	srv->spid = getpid();
 	srv->sref.ref = 0;
 	srv->rref.ref = 0;