int btrfs_subvolid_resolve(int fd, char *path, size_t path_len, u64 subvol_id);
+/*
+ * DEPRECATED: the functions path_cat and path_cat3 are unsafe and should not
+ * be used, use the _out variants and always check the return code.
+ */
+__attribute__((deprecated))
char *path_cat(const char *p1, const char *p2);
+__attribute__((deprecated))
char *path_cat3(const char *p1, const char *p2, const char *p3);
+int path_cat_out(char *out, const char *p1, const char *p2);
+int path_cat3_out(char *out, const char *p1, const char *p2, const char *p3);
+
#ifdef __cplusplus
}
#endif