From 6bef71f8edb55c1c60630fc00a21001f59b9fb35 Mon Sep 17 00:00:00 2001
From: David du Colombier <0intro@gmail.com>
Date: Tue, 23 Mar 1993 00:00:00 +0000
Subject: [PATCH] Plan 9 from Bell Labs 1993-03-23

---
 port/dev.c     | 4 ++++
 port/devmnt.c  | 5 +++--
 port/net.c     | 2 ++
 port/portdat.h | 1 +
 4 files changed, 10 insertions(+), 2 deletions(-)

diff --git a/port/dev.c b/port/dev.c
index b97ec88f98fb08e698aba0709785fedfc4883a68..6f6365e772d0303d85d5db9f581f5a519561c998 100644
--- a/port/dev.c
+++ b/port/dev.c
@@ -41,6 +41,8 @@ devdir(Chan *c, Qid qid, char *n, long length, char *user, long perm, Dir *db)
 		db->mode = CHDIR|perm;
 	else
 		db->mode = perm;
+	if(c->flag&CMSG)
+		db->mode |= CHMOUNT;
 	db->atime = seconds();
 	db->mtime = kerndate;
 	db->hlength = 0;
@@ -144,6 +146,8 @@ devstat(Chan *c, char *db, Dirtab *tab, int ntab, Devgen *gen)
 			error(Enonexist);
 		case 1:
 			if(eqqid(c->qid, dir.qid)) {
+				if(c->flag&CMSG)
+					dir.mode |= CHMOUNT;
 				convD2M(&dir, db);
 				return;
 			}
diff --git a/port/devmnt.c b/port/devmnt.c
index 5909d2328d1dddc988a5793b5c68a7b15ca1ea91..ce4c7733cfdcda92301dfbbcdd03beb64fc24f90 100644
--- a/port/devmnt.c
+++ b/port/devmnt.c
@@ -160,9 +160,10 @@ mntattach(char *muxattach)
 	c = mattach(m, bogus.spec, bogus.serv);
 
 	mc = m->c;
-	if(mc->type == devno('M', 0)) {
+	if(mc->type == devno('M', 0) && (c->qid.path&CHDIR) == 0) {
+		c->qid.path |= CHDIR;
 		c->mntptr = mc->mntptr;
-		c->mchan = c->mntptr->c;
+		c->mchan = mc->mntptr->c;
 		c->mqid = c->qid;
 		incref(c->mntptr);
 		mclose(m);
diff --git a/port/net.c b/port/net.c
index 91f677c17b265fb4f5b6450b0f0f337db1139eab..0d9728108bfd192853e7fb2aefc0a7764d7de56f 100644
--- a/port/net.c
+++ b/port/net.c
@@ -157,6 +157,8 @@ netstat(Chan *c, char *db, Network *np)
 			break;
 		case 1:
 			if(eqqid(c->qid, dir.qid)){
+				if(c->flag&CMSG)
+					dir.mode |= CHMOUNT;
 				convD2M(&dir, db);
 				return;
 			}
diff --git a/port/portdat.h b/port/portdat.h
index 24242c8af9e4373713b345ac354b1cedcea8c7cf..a4e9323696208185f662e948b4ef3f12ef786df7 100644
--- a/port/portdat.h
+++ b/port/portdat.h
@@ -766,6 +766,7 @@ enum
 	CHDIR =		0x80000000L,
 	CHAPPEND = 	0x40000000L,
 	CHEXCL =	0x20000000L,
+	CHMOUNT	=	0x10000000L,
 };
 
 /*