!10781 nilfs2: fix kernel bug on rename operation of broken directory

struct nilfs_dir_entry *nilfs_dotdot(struct inode *dir, struct page **p)

{

	struct nilfs_dir_entry *de = nilfs_get_page(dir, 0, p);

	struct page *page;

	struct nilfs_dir_entry *de, *next_de;

	size_t limit;

	char *msg;

	de = nilfs_get_page(dir, 0, &page);

	if (IS_ERR(de))

		return NULL;

	return nilfs_next_entry(de);

	limit = nilfs_last_byte(dir, 0);  /* is a multiple of chunk size */

	if (unlikely(!limit || le64_to_cpu(de->inode) != dir->i_ino ||

		     !nilfs_match(1, ".", de))) {

		msg = "missing '.'";

		goto fail;

	}

	next_de = nilfs_next_entry(de);

	/*

	 * If "next_de" has not reached the end of the chunk, there is

	 * at least one more record.  Check whether it matches "..".

	 */

	if (unlikely((char *)next_de == (char *)de + nilfs_chunk_size(dir) ||

		     !nilfs_match(2, "..", next_de))) {

		msg = "missing '..'";

		goto fail;

	}

	*p = page;

	return next_de;

fail:

	nilfs_error(dir->i_sb, "directory #%lu %s", dir->i_ino, msg);

	nilfs_put_page(page);

	return NULL;

}

ino_t nilfs_inode_by_name(struct inode *dir, const struct qstr *qstr)