Initial stab at Venti.

src/cmd/venti/zeropart.c

@@ -0,0 +1,28 @@
+#include "stdinc.h"
+#include "dat.h"
+#include "fns.h"
+
+void
+zeropart(Part *part, int blocksize)
+{
+	ZBlock *b;
+	u64int addr;
+	int w;
+
+	fprint(2, "clearing the partition\n");
+
+	b = alloczblock(MaxIoSize, 1);
+
+	w = 0;
+	for(addr = PartBlank; addr + MaxIoSize <= part->size; addr += MaxIoSize){
+		if(writepart(part, addr, b->data, MaxIoSize) < 0)
+			sysfatal("can't initialize %s, writing block %d failed: %r", part->name, w);
+		w++;
+	}
+
+	for(; addr + blocksize <= part->size; addr += blocksize)
+		if(writepart(part, addr, b->data, blocksize) < 0)
+			sysfatal("can't initialize %s: %r", part->name);
+
+	freezblock(b);
+}