From a5fdcd5946971a2bbbecf26269c667aa6bf73966 Mon Sep 17 00:00:00 2001
From: Theodore Ts'o <tytso@mit.edu>
Date: Wed, 21 May 2003 17:58:36 -0400
Subject: unused.c (do_dump_unused): Add new command which dumps the 	unused
 blocks.  (Initial implementation; currently only 	dumps the output to
 stdout.)

---
 debugfs/unused.c | 53 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 53 insertions(+)
 create mode 100644 debugfs/unused.c

(limited to 'debugfs/unused.c')

diff --git a/debugfs/unused.c b/debugfs/unused.c
new file mode 100644
index 00000000..c055db7d
--- /dev/null
+++ b/debugfs/unused.c
@@ -0,0 +1,53 @@
+/*
+ * unused.c --- quick and dirty unused space dumper
+ * 
+ * Copyright (C) 1997 Theodore Ts'o.  This file may be redistributed
+ * under the terms of the GNU Public License.
+ */
+
+#include <stdio.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <ctype.h>
+#include <string.h>
+#include <time.h>
+#ifdef HAVE_ERRNO_H
+#include <errno.h>
+#endif
+#include <sys/types.h>
+#ifdef HAVE_GETOPT_H
+#include <getopt.h>
+#else 
+extern int optind;
+extern char *optarg;
+#endif
+
+#include "debugfs.h"
+
+void do_dump_unused(int argc, char **argv)
+{
+	unsigned long	blk;
+	unsigned char buf[32768];
+	int	i;
+	errcode_t	retval;
+
+	for (blk=current_fs->super->s_first_data_block;
+	     blk < current_fs->super->s_blocks_count; blk++) {
+		if (ext2fs_test_block_bitmap(current_fs->block_map,blk))
+			continue;
+		retval = io_channel_read_blk(current_fs->io, blk, 1, buf);
+		if (retval) {
+			com_err(argv[0], retval, "While reading block\n");
+			return;
+		}
+		for (i=0; i < current_fs->blocksize; i++)
+			if (buf[i])
+				break;
+		if (i >= current_fs->blocksize)
+			continue;
+		printf("\nUnused block %ld contains non-zero data:\n\n",
+		       blk);
+		for (i=0; i < current_fs->blocksize; i++)
+			fputc(buf[i], stdout);
+	}
+}
-- 
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