bcachefs: remove_backpointer() now checks if dirent points to inode

static int remove_backpointer(struct btree_trans *trans,

			      struct bch_inode_unpacked *inode)

{

	struct btree_iter iter;

	struct bkey_s_c_dirent d;

	int ret;

	if (!inode->bi_dir)

		return 0;

	d = bch2_bkey_get_iter_typed(trans, &iter, BTREE_ID_dirents,

				     POS(inode->bi_dir, inode->bi_dir_offset), 0,

	struct bch_fs *c = trans->c;

	struct btree_iter iter;

	struct bkey_s_c_dirent d =

		bch2_bkey_get_iter_typed(trans, &iter, BTREE_ID_dirents,

				     SPOS(inode->bi_dir, inode->bi_dir_offset, inode->bi_snapshot), 0,

				     dirent);

	ret =   bkey_err(d) ?:

	int ret =   bkey_err(d) ?:

		dirent_points_to_inode(c, d, inode) ?:

		__remove_dirent(trans, d.k->p);

	bch2_trans_iter_exit(trans, &iter);

	return ret;