From e5126b09222138c70d295478f8de10033ba933d3 Mon Sep 17 00:00:00 2001
From: David du Colombier <0intro@gmail.com>
Date: Mon, 11 Oct 1993 00:00:00 +0000
Subject: [PATCH] Plan 9 from Bell Labs 1993-10-11

---
 port/cache.c  | 31 +++++++++++++++++++++++++++++++
 port/devmnt.c | 10 ++++------
 port/swap.c   |  8 +++++---
 3 files changed, 40 insertions(+), 9 deletions(-)
 create mode 100644 port/cache.c

diff --git a/port/cache.c b/port/cache.c
new file mode 100644
index 0000000000000000000000000000000000000000..ab667d9f98a85bd79021b535c800a920161f22bc
--- /dev/null
+++ b/port/cache.c
@@ -0,0 +1,31 @@
+#include	"u.h"
+#include	"../port/lib.h"
+#include	"mem.h"
+#include	"dat.h"
+#include	"fns.h"
+#include	"../port/error.h"
+#include	"devtab.h"
+
+typedef struct Fcache Fcache;
+typedef struct Fcalloc Fcalloc;
+struct Fcache
+{
+	QLock;
+	Qid;
+	Page*	alloc;
+	Fcache*	hash;
+	Fcache*	next;
+};
+
+struct Fcalloc
+{
+	ulong	start;
+	short	len;
+	Page*	data;
+};
+
+Fcache*
+clook(Qid *qid)
+{
+
+}
diff --git a/port/devmnt.c b/port/devmnt.c
index eedc73fca4c09a681e2762b0c7bd831c9db7f55c..92d69976dd24fd399b4b8a91a1c88719fe3cb416 100644
--- a/port/devmnt.c
+++ b/port/devmnt.c
@@ -56,11 +56,9 @@ Chan*	mntchan(void);
 
 enum
 {
-	Tagspace = 1,
-	Tagfls = 0x8000,
-	Tagend = 0xfffe,
-
-	ALIGN = 256,		/* Vme block mode alignment */
+	Tagspace	= 1,
+	Tagfls		= 0x8000,
+	Tagend		= 0xfffe,
 };
 
 void
@@ -862,7 +860,7 @@ mntchk(Chan *c)
 		error(Eshutdown);
 
 	/*
-	 * Try and get the channel back
+	 * Try and get the channel back after a crash
 	 */
 	if((c->flag&CRECOV) && m->recprog == 0)
 		recoverchan(m, c);
diff --git a/port/swap.c b/port/swap.c
index 4a1a970399a6aa623cabeeaf294034139e4c56cd..8e6cf6fb6d24ef22ffe2117bf295f4482983251f 100644
--- a/port/swap.c
+++ b/port/swap.c
@@ -94,9 +94,10 @@ kickpager(void)
 void
 pager(void *junk)
 {
-	Proc *p, *ep;
-	Segment *s;
 	int i;
+	Image *img;
+	Segment *s;
+	Proc *p, *ep;
 
 	if(waserror()) 
 		panic("pager: os error\n");
@@ -115,7 +116,8 @@ loop:
 			p = proctab(0);
 
 		/* don't swap out programs from devroot.c */
-		if(devchar[p->seg[SG_TEXT]->image->c->type] == '/')
+		img = p->seg[SG_TEXT]->image;
+		if(img && devchar[img->c->type] == '/')
 			continue;
 
 		if(p->state == Dead || p->kp)