From e28345d703c7fb80b9c440c147f60886efd3a135 Mon Sep 17 00:00:00 2001
From: David du Colombier <0intro@gmail.com>
Date: Wed, 9 Aug 2000 00:00:00 +0000
Subject: [PATCH] Plan 9 from Bell Labs 2000-08-09

---
 alphapc/sd.h |  3 ++-
 pc/vgas3.c   |  4 ++--
 port/devsd.c | 31 ++++++++++++++++++++++---------
 port/sd.h    |  3 ++-
 4 files changed, 28 insertions(+), 13 deletions(-)

diff --git a/alphapc/sd.h b/alphapc/sd.h
index e0eb1675b358b3204ef6c860031d560b9ef1c96c..469c9a4e99c657acafa3d9791cc8c54b923c95b1 100644
--- a/alphapc/sd.h
+++ b/alphapc/sd.h
@@ -32,7 +32,8 @@ typedef struct SDunit {
 	QLock	ctl;
 	ulong	sectors;
 	ulong	secsize;
-	SDpart*	part;			/* nil or array of size SDnpart */
+	SDpart*	part;			/* nil or array of size npart */
+	int	npart;
 	ulong	vers;
 	SDperm	ctlperm;
 
diff --git a/pc/vgas3.c b/pc/vgas3.c
index bc214dd069dd007a64bcf3d2943538549f28facd..624a42d18b55e506559169e10905f048dfe7973a 100644
--- a/pc/vgas3.c
+++ b/pc/vgas3.c
@@ -193,7 +193,7 @@ s3load(VGAscr* scr, Cursor* curs)
 
 	opage = 0;
 	p = KADDR(scr->aperture);
-	id = (vgaxi(Crtx, 0x30)<<8)|vgaxi(Crtx, 0x2E);
+	id = (vgaxi(Crtx, 0x2D)<<8)|vgaxi(Crtx, 0x2E);
 	switch(id){
 
 	case 0x5631:				/* ViRGE */
@@ -531,7 +531,7 @@ s3drawinit(VGAscr *scr)
 {
 	ulong id;
 
-	id = (vgaxi(Crtx, 0x30)<<8)|vgaxi(Crtx, 0x2E);
+	id = (vgaxi(Crtx, 0x2D)<<8)|vgaxi(Crtx, 0x2E);
 	scr->id = id;
 
 	/*
diff --git a/port/devsd.c b/port/devsd.c
index 66e3b544206cee309bf2102d8761a1f7b49da7d4..d7a92a386cde0cb1bd25a12d115efb529e8f7ee1 100644
--- a/port/devsd.c
+++ b/port/devsd.c
@@ -55,7 +55,7 @@ sdaddpart(SDunit* unit, char* name, ulong start, ulong end)
 	 */
 	if(unit->part != nil){
 		partno = -1;
-		for(i = 0; i < SDnpart; i++){
+		for(i = 0; i < unit->npart; i++){
 			pp = &unit->part[i];
 			if(!pp->valid){
 				if(partno == -1)
@@ -72,14 +72,27 @@ sdaddpart(SDunit* unit, char* name, ulong start, ulong end)
 	else{
 		if((unit->part = malloc(sizeof(SDpart)*SDnpart)) == nil)
 			error(Enomem);
+		unit->npart = SDnpart;
 		partno = 0;
 	}
 
 	/*
-	 * Check there is a free slot and size and extent are valid.
+	 * If no free slot found then increase the
+	 * array size (can't get here with unit->part == nil).
+	 */
+	if(partno == -1){
+		if((pp = malloc(sizeof(SDpart)*(unit->npart+SDnpart))) == nil)
+			error(Enomem);
+		memmove(pp, unit->part, sizeof(SDpart)*unit->npart);
+		free(unit->part);
+		unit->part = pp;
+		partno = unit->npart;
+		unit->npart += SDnpart;
+	}
+
+	/*
+	 * Check size and extent are valid.
 	 */
-	if(partno == -1)
-		error(Ebadctl);
 	if(start > end || end > unit->sectors)
 		error(Eio);
 	pp = &unit->part[partno];
@@ -102,12 +115,12 @@ sddelpart(SDunit* unit,  char* name)
 	 * Can't delete if someone still has it open.
 	 */
 	pp = unit->part;
-	for(i = 0; i < SDnpart; i++){
+	for(i = 0; i < unit->npart; i++){
 		if(strncmp(name, pp->name, NAMELEN) == 0)
 			break;
 		pp++;
 	}
-	if(i >= SDnpart)
+	if(i >= unit->npart)
 		error(Ebadctl);
 	if(strncmp(up->user, pp->user, NAMELEN) && !iseve())
 		error(Eperm);
@@ -125,7 +138,7 @@ sdinitpart(SDunit* unit)
 	unit->vers++;
 	unit->sectors = unit->secsize = 0;
 	if(unit->part){
-		for(i = 0; i < SDnpart; i++){
+		for(i = 0; i < unit->npart; i++){
 			unit->part[i].valid = 0;
 			unit->part[i].vers++;
 		}
@@ -420,7 +433,7 @@ sdgen(Chan* c, Dirtab*, int, int s, Dir* dp)
 			return r;
 		}
 		i -= Qpart;
-		if(unit->part == nil || i >= SDnpart){
+		if(unit->part == nil || i >= unit->npart){
 			qunlock(&unit->ctl);
 			break;
 		}
@@ -749,7 +762,7 @@ sdread(Chan *c, void *a, long n, vlong off)
 					"geometry %ld %ld\n",
 					unit->sectors, unit->secsize);
 			pp = unit->part;
-			for(i = 0; i < SDnpart; i++){
+			for(i = 0; i < unit->npart; i++){
 				if(pp->valid)
 					l += snprint(p+l, READSTR-l,
 						"part %.*s %lud %lud\n",
diff --git a/port/sd.h b/port/sd.h
index e0eb1675b358b3204ef6c860031d560b9ef1c96c..469c9a4e99c657acafa3d9791cc8c54b923c95b1 100644
--- a/port/sd.h
+++ b/port/sd.h
@@ -32,7 +32,8 @@ typedef struct SDunit {
 	QLock	ctl;
 	ulong	sectors;
 	ulong	secsize;
-	SDpart*	part;			/* nil or array of size SDnpart */
+	SDpart*	part;			/* nil or array of size npart */
+	int	npart;
 	ulong	vers;
 	SDperm	ctlperm;