#if defined(XVFS_MODE_FLEXIBLE) || defined(XVFS_MODE_SERVER)
#define XVFS_INTERNAL_SERVER_MAGIC "\xD4\xF3\x05\x96\x25\xCF\xAF\xFE"
#define XVFS_INTERNAL_SERVER_MAGIC_LEN 8

struct xvfs_tclfs_server_info {
	char magic[XVFS_INTERNAL_SERVER_MAGIC_LEN];
	int protocolVersion;
	const char *rootMountpoint;
	int (*registerProc)(Tcl_Interp *interp, struct Xvfs_FSInfo *fsInfo);
};
#endif /* XVFS_MODE_FLEXIBLE || XVFS_MODE_SERVER */

#if defined(XVFS_MODE_SERVER) || defined(XVFS_MODE_STANDALONE) || defined(XVFS_MODE_FLEXIBLE)
#ifndef XVFS_ROOT_MOUNTPOINT
#  define XVFS_ROOT_MOUNTPOINT "//xvfs:/"

	fsHandlerData = (struct xvfs_tclfs_server_info *) fsHandlerDataRaw;

	/*
	 * XXX:TODO: What is the chance that the handler for //xvfs:/ hold
	 * client data smaller than XVFS_INTERNAL_SERVER_MAGIC_LEN ?
	 */
	if (memcmp(fsHandlerData->magic, XVFS_INTERNAL_SERVER_MAGIC, sizeof(fsHandlerData->magic)) == 0) {
		/*
		 * Refuse to talk to the in-core implementation if it is a lower
		 * version.
		 */
		XVFS_DEBUG_PUTS("Found a server handler, checking for compatible version");
		if (fsHandlerData->protocolVersion >= XVFS_PROTOCOL_VERSION) {
			XVFS_DEBUG_PUTS("Found a server handler with a compatible version, checking for compatible root");
			if (strcmp(XVFS_ROOT_MOUNTPOINT, fsHandlerData->rootMountpoint) == 0) {
				XVFS_DEBUG_PUTS("Found a server handler with a compatible version and checking for compatible root");

				xvfs_register = fsHandlerData->registerProc;
			}
		}
	}

	if (xvfs_register == &xvfs_standalone_register) {
		XVFS_DEBUG_PUTS("Using xvfs_standalone_register");
	} else {
		XVFS_DEBUG_PUTS("Using Xvfs_Register from Xvfs Server Core");
	}

	XVFS_DEBUG_LEAVE;

	return(xvfs_register(interp, fsInfo));
}
#endif /* XVFS_MODE_FLEXIBLE */

#if defined(XVFS_MODE_SERVER)
static Tcl_Filesystem xvfs_tclfs_dispatch_fs;
static Tcl_HashTable xvfs_tclfs_dispatch_map;
static struct xvfs_tclfs_server_info xvfs_tclfs_dispatch_fsdata;

static int xvfs_tclfs_dispatch_pathInXVFS(Tcl_Obj *path) {
	const char *pathStr, *rootStr;
	int pathLen, rootLen;

	XVFS_DEBUG_ENTER;

	XVFS_DEBUG_PRINTF("Verifying that \"%s\" belongs in XVFS ...", Tcl_GetString(path));

	int rootLen;
	char *pathStr, *fsName, *fsNameEnds, origSep;

	XVFS_DEBUG_ENTER;

	path = xvfs_absolutePath(path);

	if (xvfs_tclfs_dispatch_pathInXVFS(path) != TCL_OK) {
		Tcl_DecrRefCount(path);

		XVFS_DEBUG_LEAVE;

		return(NULL);
	}

	 * UNREACH: We do no need the more specific check because we
	 * claim everything under the root, but we want to suppress
	 * a warning about it not being used.
	 */
	xvfs_tclfs_pathInFilesystem(NULL, NULL, NULL);
	return(NULL);
}

static int xvfs_tclfs_dispatch_pathInFS(Tcl_Obj *path, ClientData *dataPtr) {
	struct xvfs_tclfs_instance_info *instanceInfo;

	instanceInfo = xvfs_tclfs_dispatch_pathToInfo(path);
	if (!instanceInfo) {
		return(-1);
	}

	return(TCL_OK);
}

static int xvfs_tclfs_dispatch_stat(Tcl_Obj *path, Tcl_StatBuf *statBuf) {
	struct xvfs_tclfs_instance_info *instanceInfo;

	instanceInfo = xvfs_tclfs_dispatch_pathToInfo(path);
	if (!instanceInfo) {
		Tcl_SetErrno(xvfs_errorToErrno(XVFS_RV_ERR_ENOENT));

	xvfs_tclfs_dispatch_fs.copyDirectoryProc          = NULL;
	xvfs_tclfs_dispatch_fs.lstatProc                  = NULL;
	xvfs_tclfs_dispatch_fs.loadFileProc               = NULL;
	xvfs_tclfs_dispatch_fs.getCwdProc                 = NULL;
	xvfs_tclfs_dispatch_fs.chdirProc                  = NULL;

	memcpy(xvfs_tclfs_dispatch_fsdata.magic, XVFS_INTERNAL_SERVER_MAGIC, XVFS_INTERNAL_SERVER_MAGIC_LEN);
	xvfs_tclfs_dispatch_fsdata.registerProc    = Xvfs_Register;
	xvfs_tclfs_dispatch_fsdata.protocolVersion = XVFS_PROTOCOL_VERSION;
	xvfs_tclfs_dispatch_fsdata.rootMountpoint  = XVFS_ROOT_MOUNTPOINT;

	tclRet = Tcl_FSRegister((ClientData) &xvfs_tclfs_dispatch_fsdata, &xvfs_tclfs_dispatch_fs);
	if (tclRet != TCL_OK) {
		if (interp) {
			Tcl_SetResult(interp, "Tcl_FSRegister() failed", NULL);
		}