Dump-like file system backup for Unix, built on Venti.

src/cmd/vbackup/diskcat.c

@@ -0,0 +1,54 @@
+#include <u.h>
+#include <libc.h>
+#include <diskfs.h>
+
+void
+usage(void)
+{
+	fprint(2, "usage: fscat fspartition\n");
+	exits("usage");
+}
+
+int
+main(int argc, char **argv)
+{
+	extern int nfilereads;
+	u8int *zero;
+	u32int i;
+	u32int n;
+	Block *b;
+	Disk *disk;
+	Fsys *fsys;
+
+	ARGBEGIN{
+	default:
+		usage();
+	}ARGEND
+
+	if(argc != 1)
+		usage();
+
+	if((disk = diskopenfile(argv[0])) == nil)
+		sysfatal("diskopen: %r");
+	if((disk = diskcache(disk, 16384, 16)) == nil)
+		sysfatal("diskcache: %r");
+	if((fsys = fsysopen(disk)) == nil)
+		sysfatal("ffsopen: %r");
+
+	zero = emalloc(fsys->blocksize);
+	fprint(2, "%d blocks total\n", fsys->nblock);
+	n = 0;
+	for(i=0; i<fsys->nblock; i++){
+		if((b = fsysreadblock(fsys, i)) != nil){
+			write(1, b->data, fsys->blocksize);
+			n++;
+			blockput(b);
+		}else
+			write(1, zero, fsys->blocksize);
+		if(b == nil && i < 2)
+			sysfatal("block %d not in use", i);
+	}
+	fprint(2, "%d blocks in use, %d file reads\n", n, nfilereads);
+	exits(nil);
+	return 0;
+}