From f6347b44fcb2d6b17d12f9f7f833cd0b55333b69 Mon Sep 17 00:00:00 2001
From: David du Colombier <0intro@gmail.com>
Date: Wed, 12 Sep 2001 00:00:00 +0000
Subject: [PATCH] Plan 9 from Bell Labs 2001-09-12

---
 bitsy/etherwavelan.c |  6 +++++-
 pc/etherwavelan.c    | 12 +++++++++++-
 port/chan.c          | 15 +++++++++++----
 port/sysfile.c       |  8 +++++++-
 4 files changed, 34 insertions(+), 7 deletions(-)

diff --git a/bitsy/etherwavelan.c b/bitsy/etherwavelan.c
index 38ca8d7016de19fcfdb68079217122ae65300385..25433f31dd10b0466abc1f8ab13e7254310be6a5 100644
--- a/bitsy/etherwavelan.c
+++ b/bitsy/etherwavelan.c
@@ -105,7 +105,6 @@ enum
 	WTyp_NodeName	= 0xfc0e,
 	WTyp_Crypt	= 0xfc20,
 	WTyp_XClear	= 0xfc22,
-	WTyp_Tick	= 0xfce0,
  	WTyp_CreateIBSS	= 0xfc81,
 	WTyp_RtsThres	= 0xfc83,
 	WTyp_TxRate	= 0xfc84,
@@ -115,10 +114,12 @@ enum
 	WTyp_Prom	= 0xfc85,
 	WTyp_Keys	= 0xfcb0,
 	WTyp_TxKey	= 0xfcb1,
+	WTyp_StationID	= 0xfd20,
 	WTyp_CurName	= 0xfd41,
 	WTyp_BaseID	= 0xfd42,	// ID of the currently connected-to base station
 	WTyp_CurTxRate	= 0xfd44,	// Current TX rate
 	WTyp_HasCrypt	= 0xfd4f,
+	WTyp_Tick	= 0xfce0,
 };
 
 // Controller
@@ -435,7 +436,10 @@ ltv_outstr(Ctlr* ctlr, int type, char* val)
 	memset(&ltv, 0, sizeof(ltv));
 	ltv.len = (sizeof(ltv.type)+sizeof(ltv.slen)+sizeof(ltv.s))/2;
 	ltv.type = type;
+
+//	This should be ltv.slen = len; according to Axel Belinfante
 	ltv.slen = (len+1) & ~1;
+
 	strncpy(ltv.s, val, len);
 	w_outltv(ctlr, &ltv);
 }
diff --git a/pc/etherwavelan.c b/pc/etherwavelan.c
index 472b6cfa95880e1dec5df9301587c95530c73a48..d952917396573759280e88aacc38a71bff3b2c08 100644
--- a/pc/etherwavelan.c
+++ b/pc/etherwavelan.c
@@ -105,7 +105,7 @@ enum
 	WTyp_NodeName	= 0xfc0e,
 	WTyp_Crypt	= 0xfc20,
 	WTyp_XClear	= 0xfc22,
-	WTyp_Tick	= 0xfce0,
+ 	WTyp_CreateIBSS	= 0xfc81,
 	WTyp_RtsThres	= 0xfc83,
 	WTyp_TxRate	= 0xfc84,
 		WTx1Mbps	= 0x0,
@@ -119,6 +119,7 @@ enum
 	WTyp_BaseID	= 0xfd42,	// ID of the currently connected-to base station
 	WTyp_CurTxRate	= 0xfd44,	// Current TX rate
 	WTyp_HasCrypt	= 0xfd4f,
+	WTyp_Tick	= 0xfce0,
 };
 
 // Controller
@@ -274,6 +275,7 @@ struct Ctlr
 	int	attached;
 	int	slot;
 	int	iob;
+ 	int	createibss;
 	int	ptype;
 	int	apdensity;
 	int	rtsthres;
@@ -541,6 +543,7 @@ w_enable(Ether* ether)
 	ltv_outs(ctlr, WTyp_Tick, 8);
 	ltv_outs(ctlr, WTyp_MaxLen, ctlr->maxlen);
 	ltv_outs(ctlr, WTyp_Ptype, ctlr->ptype);
+ 	ltv_outs(ctlr, WTyp_CreateIBSS, ctlr->createibss);
 	ltv_outs(ctlr, WTyp_RtsThres, ctlr->rtsthres);
 	ltv_outs(ctlr, WTyp_TxRate, ctlr->txrate);
 	ltv_outs(ctlr, WTyp_ApDens, ctlr->apdensity);
@@ -1050,6 +1053,12 @@ option(Ctlr* ctlr, char* buf, long n)
 		else
 			r = -1;
 	}
+	else if(cistrcmp(cb->f[0], "ibss") == 0){
+		if(cistrcmp(cb->f[1], "on") == 0)
+			ctlr->createibss = 1;
+		else
+			ctlr->createibss = 0;
+	}
 	else if(cistrcmp(cb->f[0], "crypt") == 0){
 		if(cistrcmp(cb->f[1], "off") == 0)
 			ctlr->crypt = 0;
@@ -1218,6 +1227,7 @@ reset(Ether* ether)
 	ctlr->chan = 0;
 	ctlr->ptype = WDfltPType;
 	ctlr->txkey = 0;
+	ctlr->createibss = 0;
 	ctlr->keys.len = sizeof(WKey)*WNKeys/2 + 1;
 	ctlr->keys.type = WTyp_Keys;
 	if(ctlr->hascrypt = ltv_ins(ctlr, WTyp_HasCrypt))
diff --git a/port/chan.c b/port/chan.c
index 494dcea91509614d5b4f15d02b65c9f36648b598..10489f6c53b6a2f65f1c5d43f23501235011370a 100644
--- a/port/chan.c
+++ b/port/chan.c
@@ -546,10 +546,17 @@ cunmount(Chan *mnt, Chan *mounted)
 	Mhead *m, **l;
 	Mount *f, **p;
 
-if(mnt->umh)	/* should not happen */
-	print("cunmount newp extra umh %p has %p\n", mnt, mnt->umh);
-if(mounted && mounted->umh)
-	print("cunmount old extra umh %p has %p\n", mounted, mounted->umh);
+	if(mnt->umh)	/* should not happen */
+		print("cunmount newp extra umh %p has %p\n", mnt, mnt->umh);
+
+	/*
+	 * It _can_ happen that mounted->umh is non-nil, 
+	 * because mounted is the result of namec(Aopen)
+	 * (see sysfile.c:/^sysunmount).
+	 * If we open a union directory, it will have a umh.
+	 * Although surprising, this is okay, since the
+	 * cclose will take care of freeing the umh.
+	 */
 
 	pg = up->pgrp;
 	wlock(&pg->ns);
diff --git a/port/sysfile.c b/port/sysfile.c
index 50f24da8440298cbab715741f47ad4fc9940750a..e42c607a1183cc73d43b1e8cccfca6cc2c2ef5d7 100644
--- a/port/sysfile.c
+++ b/port/sysfile.c
@@ -784,7 +784,13 @@ sysunmount(ulong *arg)
 			nexterror();
 		}
 		validaddr(arg[0], 1, 0);
-		cmounted = namec((char*)arg[0], Aaccess, OREAD, 0);
+		/*
+		 * This has to be namec(..., Aopen, ...) because
+		 * if arg[0] is something like /srv/cs or /fd/0,
+		 * opening it is the only way to get at the real
+		 * Chan underneath.
+		 */
+		cmounted = namec((char*)arg[0], Aopen, OREAD, 0);
 		poperror();
 	}