int bch2_dirent_create_snapshot(struct btree_trans *trans,
			u64 dir, u32 snapshot,
			const struct bch_hash_info *hash_info,
			u8 type, const struct qstr *name, u64 dst_inum,
			u64 *dir_offset,
			bch_str_hash_flags_t str_hash_flags)
int bch2_dirent_create_snapshot(struct btree_trans *trans,
			u32 dir_subvol, u64 dir, u32 snapshot,
			const struct bch_hash_info *hash_info,
			u8 type, const struct qstr *name, u64 dst_inum,
			u64 *dir_offset,
			bch_str_hash_flags_t str_hash_flags)