On Mon, Mar 13, 2017 at 03:14:13PM -0700, Till Smejkal wrote:

+/**
+ * Create a new VAS segment.
+ *
+ * @param[in] name:		The name of the new VAS segment.
+ * @param[in] start:		The address where the VAS segment begins.
+ * @param[in] end:		The address where the VAS segment ends.
+ * @param[in] mode:		The access rights for the VAS segment.
+ *
+ * @returns:			The VAS segment ID on success, -ERRNO otherwise.
+ **/

Please follow the kernel-doc conventions, as described in
Documentation/doc-guide/kernel-doc.rst.  Also, function documentation
goes with the implementation, not the declaration.

+/**
+ * Get ID of the VAS segment belonging to a given name.
+ *
+ * @param[in] name:		The name of the VAS segment for which the ID
+ *				should be returned.
+ *
+ * @returns:			The VAS segment ID on success, -ERRNO
+ *				otherwise.
+ **/
+extern int vas_seg_find(const char *name);

So ... segments have names, and IDs ... and access permissions ...
Why isn't this a special purpose filesystem?