1 files changed, 102 insertions, 0 deletions
diff --git a/lib/ext2fs/read_bb.c b/lib/ext2fs/read_bb.c
new file mode 100644
index 0000000..e58b7cb
--- /dev/null
+++ b/lib/ext2fs/read_bb.c
@@ -0,0 +1,102 @@
+/*
+ * read_bb --- read the bad blocks inode
+ *
+ * Copyright (C) 1994 Theodore Ts'o.
+ *
+ * %Begin-Header%
+ * This file may be redistributed under the terms of the GNU Library
+ * General Public License, version 2.
+ * %End-Header%
+ */
+
+#include "config.h"
+#include <stdio.h>
+#include <string.h>
+#if HAVE_UNISTD_H
+#include <unistd.h>
+#endif
+#include <fcntl.h>
+#include <time.h>
+#if HAVE_SYS_STAT_H
+#include <sys/stat.h>
+#endif
+#if HAVE_SYS_TYPES_H
+#include <sys/types.h>
+#endif
+
+#include "ext2_fs.h"
+#include "ext2fs.h"
+
+struct read_bb_record {
+	ext2_badblocks_list	bb_list;
+	errcode_t	err;
+};
+
+/*
+ * Helper function for ext2fs_read_bb_inode()
+ */
+#ifdef __TURBOC__
+ #pragma argsused
+#endif
+static int mark_bad_block(ext2_filsys fs, blk_t *block_nr,
+			  e2_blkcnt_t blockcnt EXT2FS_ATTR((unused)),
+			  blk_t ref_block EXT2FS_ATTR((unused)),
+			  int ref_offset EXT2FS_ATTR((unused)),
+			  void *priv_data)
+{
+	struct read_bb_record *rb = (struct read_bb_record *) priv_data;
+
+	if (blockcnt < 0)
+		return 0;
+
+	if ((*block_nr < fs->super->s_first_data_block) ||
+	    (*block_nr >= ext2fs_blocks_count(fs->super)))
+		return 0;	/* Ignore illegal blocks */
+
+	rb->err = ext2fs_badblocks_list_add(rb->bb_list, *block_nr);
+	if (rb->err)
+		return BLOCK_ABORT;
+	return 0;
+}
+
+/*
+ * Reads the current bad blocks from the bad blocks inode.
+ */
+errcode_t ext2fs_read_bb_inode(ext2_filsys fs, ext2_badblocks_list *bb_list)
+{
+	errcode_t	retval;
+	struct read_bb_record rb;
+	struct ext2_inode inode;
+	blk_t	numblocks;
+
+	EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);
+
+	if (!*bb_list) {
+		retval = ext2fs_read_inode(fs, EXT2_BAD_INO, &inode);
+		if (retval)
+			return retval;
+		numblocks = inode.i_blocks;
+		if (!(ext2fs_has_feature_huge_file(fs->super) &&
+		      (inode.i_flags & EXT4_HUGE_FILE_FL)))
+			numblocks = numblocks / (fs->blocksize / 512);
+		numblocks += 20;
+		if (numblocks < 50)
+			numblocks = 50;
+		if (numblocks > 50000)
+			numblocks = 500;
+		retval = ext2fs_badblocks_list_create(bb_list, numblocks);
+		if (retval)
+			return retval;
+	}
+
+	rb.bb_list = *bb_list;
+	rb.err = 0;
+	retval = ext2fs_block_iterate2(fs, EXT2_BAD_INO, BLOCK_FLAG_READ_ONLY,
+				       0, mark_bad_block, &rb);
+	if (retval)
+		return retval;
+
+	return rb.err;
+}
+
+