Remove config ioctl calls

While they were going to be the new way of interacting with the runtime config
I've decided to use toml based config for mergerfs v3. In that case all updates
will happen through the config file and ioctl will only be used to load/reload
the config rather than a key:value like API.

src/fuse_ioctl.cpp

@@ -40,15 +40,8 @@ using std::vector;
 
 typedef char IOCTL_BUF[4096];
 #define IOCTL_APP_TYPE 0xDF
-//#define IOCTL_READ_KEYS 0xD000DF00
-//#define IOCTL_READ_VAL  0xD000DF01
-//#define IOCTL_WRITE_VAL 0x5000DF02
-//#define IOCTL_FILE_INFO 0xD000DF03
-#define IOCTL_READ_KEYS _IOWR(IOCTL_APP_TYPE,0,IOCTL_BUF)
-#define IOCTL_READ_VAL  _IOWR(IOCTL_APP_TYPE,1,IOCTL_BUF)
-#define IOCTL_WRITE_VAL _IOW(IOCTL_APP_TYPE,2,IOCTL_BUF)
-#define IOCTL_FILE_INFO _IOWR(IOCTL_APP_TYPE,3,IOCTL_BUF)
-
+//#define IOCTL_FILE_INFO 0xD000DF00
+#define IOCTL_FILE_INFO _IOWR(IOCTL_APP_TYPE,0,IOCTL_BUF)
 
 #ifndef FS_IOC_GETFLAGS
 # define FS_IOC_GETFLAGS _IOR('f',1,long)
@@ -199,58 +192,6 @@ namespace l
     return s_.size();
   }
 
-  static
-  int
-  read_keys(void *data_)
-  {
-    Config::Read cfg;
-    std::string  keys;
-
-    cfg->keys(keys);
-
-    return l::strcpy(keys,data_);
-  }
-
-  static
-  int
-  read_val(void *data_)
-  {
-    Config::Read cfg;
-    int rv;
-    char *data;
-    std::string key;
-    std::string val;
-
-    data = (char*)data_;
-    data[sizeof(IOCTL_BUF) - 1] = '\0';
-
-    key = data;
-    rv = cfg->get(key,&val);
-    if(rv < 0)
-      return rv;
-
-    return l::strcpy(val,data_);
-  }
-
-  static
-  int
-  write_val(void *data_)
-  {
-    Config::Write cfg;
-    char *data;
-    std::string kv;
-    std::string key;
-    std::string val;
-
-    data = (char*)data_;
-    data[sizeof(IOCTL_BUF) - 1] = '\0';
-
-    kv = data;
-    str::splitkv(kv,'=',&key,&val);
-
-    return cfg->set(key,val);
-  }
-
   static
   int
   file_basepath(const Policy::Search &searchFunc_,
@@ -378,12 +319,6 @@ namespace FUSE
   {
     switch(cmd_)
       {
-      case IOCTL_READ_KEYS:
-        return l::read_keys(data_);
-      case IOCTL_READ_VAL:
-        return l::read_val(data_);
-      case IOCTL_WRITE_VAL:
-        return l::write_val(data_);
       case IOCTL_FILE_INFO:
         return l::file_info(ffi_,data_);
       }