Index: uspace/srv/vfs/vfs.c
===================================================================
--- uspace/srv/vfs/vfs.c	(revision c952465d66582d062bb278ff1f23d914b2cc48a2)
+++ uspace/srv/vfs/vfs.c	(revision b3f598ebee650f391b5874155c1eb9e7f6457341)
@@ -42,4 +42,36 @@
 #include "vfs.h"
 
+static void vfs_register(ipc_callid_t iid, ipc_call_t *icall)
+{
+	ipc_callid_t callid;
+	ipc_call_t call;
+
+	callid = async_get_call(&call);
+	if (IPC_GET_METHOD(call) == IPC_M_DATA_SEND) {
+		size_t size = IPC_GET_ARG3(call);
+		if (size != sizeof(vfs_info_t)) {
+			/*
+			 * The client is sending us something, which cannot be
+			 * the info structure.
+			 */
+			ipc_answer_fast(iid, EINVAL, 0, 0);
+			ipc_answer_fast(callid, EINVAL, 0, 0);
+			return;
+		}
+		/*
+		 * XXX: continue here
+		 * Allocate an info structue, answer the call, check sanity
+		 * of the copied-in info structure, ...
+		 */
+	} else {
+		/*
+		 * The client doesn't obey the same protocol as we do.
+		 */ 
+		ipc_answer_fast(iid, EINVAL, 0, 0);
+		ipc_answer_fast(callid, EINVAL, 0, 0);
+		return;
+	}
+}
+
 static void vfs_connection(ipc_callid_t iid, ipc_call_t *icall)
 {
@@ -65,4 +97,6 @@
 	switch (iarg1) {
 	case VFS_REGISTER:
+		vfs_register(iid, icall);
+		break;
 	case VFS_MOUNT:
 	case VFS_UNMOUNT:
Index: uspace/srv/vfs/vfs.h
===================================================================
--- uspace/srv/vfs/vfs.h	(revision c952465d66582d062bb278ff1f23d914b2cc48a2)
+++ uspace/srv/vfs/vfs.h	(revision b3f598ebee650f391b5874155c1eb9e7f6457341)
@@ -35,9 +35,35 @@
 
 typedef enum {
-	VFS_REGISTER = 1,
+	VFS_REGISTER = 0,
 	VFS_MOUNT,
 	VFS_UNMOUNT,
-	VFS_OPEN
+	VFS_OPEN,
+	VFS_LAST,		/* keep this the last member of the enum */
 } vfs_request_t;
+
+
+/**
+ * An instance of this structure is associated with a particular FS operation.
+ * It tells VFS if the FS supports the operation or maybe if a default one
+ * should be used.
+ */
+typedef enum {
+	VFS_OP_NOTSUP = 0,
+	VFS_OP_DEFAULT,
+	VFS_OP_DEFINED
+} vfs_op_t;
+
+#define FS_NAME_MAXLEN	20
+
+/**
+ * A structure like this is passed to VFS by each individual FS upon its
+ * registration. It assosiates a human-readable identifier with each
+ * registered FS. More importantly, through this structure, the FS announces
+ * what operations it supports.
+ */
+typedef struct {
+	char fs_name[FS_NAME_MAXLEN];	/**< Unique identifier of the fs. */
+	vfs_op_t ops[VFS_LAST];		/**< Operations. */
+} vfs_info_t;
 
 #endif