Initial stab at Venti.

src/cmd/venti/fmtisect.c

@@ -0,0 +1,69 @@
+#include "stdinc.h"
+#include "dat.h"
+#include "fns.h"
+
+void
+usage(void)
+{
+	fprint(2, "usage: fmtisect [-Z] [-b blocksize] name file\n");
+	threadexitsall(0);
+}
+
+void
+threadmain(int argc, char *argv[])
+{
+	ISect *is;
+	Part *part;
+	char *file, *name;
+	int blocksize, setsize, zero;
+
+	fmtinstall('V', vtscorefmt);
+	statsinit();
+
+	blocksize = 8 * 1024;
+	setsize = 64 * 1024;
+	zero = 1;
+	ARGBEGIN{
+	case 'b':
+		blocksize = unittoull(ARGF());
+		if(blocksize == ~0)
+			usage();
+		if(blocksize > MaxDiskBlock){
+			fprint(2, "block size too large, max %d\n", MaxDiskBlock);
+			threadexitsall("usage");
+		}
+		break;
+	case 'Z':
+		zero = 0;
+		break;
+	default:
+		usage();
+		break;
+	}ARGEND
+
+	if(argc != 2)
+		usage();
+
+	name = argv[0];
+	file = argv[1];
+
+	if(nameok(name) < 0)
+		sysfatal("illegal name %s", name);
+
+	part = initpart(file, 0);
+	if(part == nil)
+		sysfatal("can't open partition %s: %r", file);
+
+	if(zero)
+		zeropart(part, blocksize);
+
+	fprint(2, "configuring index section %s with space for index config bytes=%d\n", name, setsize);
+	is = newisect(part, name, blocksize, setsize);
+	if(is == nil)
+		sysfatal("can't initialize new index: %r");
+
+	if(wbisect(is) < 0)
+		fprint(2, "can't write back index section header for %s: %r\n", file);
+
+	threadexitsall(0);
+}