.

wcfs/internal/wcfs_virtmem.cpp

@@ -31,16 +31,26 @@ using dict = std::unordered_map<Key, Value>;
 #include <stdint.h>
 
 typedef uint64_t Tid;   // XXX ok?
+typedef uint64_t Oid;   // XXX ok?
+
+// XXX ok?
+struct IContext {
+    virtual chan<structZ> done() = 0;
+};
 
 struct Conn;
 struct _File;
 
+// WCFS represents filesystem-level connection to wcfs server.
 // XXX doc
 struct WCFS {
 
     Conn *connect(Tid at);
 };
 
+// Conn represents logical connection that provides view of data on wcfs
+// filesystem as of particular database state.
+//
 // XXX doc
 struct Conn {
     WCFS    *_wc;
@@ -48,9 +58,15 @@ struct Conn {
     // _wlink
 
     sync::Mutex        _filemu;
-    dict<Tid, _File*>  _filetab; // {} foid -> _file
+    dict<Oid, _File*>  _filetab; // {} foid -> _file
+
+
+private:
+    void _pinner(IContext *ctx);
 };
 
+// _File represent isolated file view under Conn.
+//
 // XXX doc
 struct _File {
     // XXX
@@ -59,6 +75,7 @@ struct _File {
 // XXX struct Mapping
 
 
+// connect creates new Conn viewing WCFS state as of @at.
 Conn *WCFS::connect(Tid at) {
     WCFS *wc = this;
 
@@ -77,3 +94,10 @@ Conn *WCFS::connect(Tid at) {
 
     return wconn;
 }
+
+// XXX Conn::close
+
+// _pinner receives pin messages from wcfs and adjusts wconn mappings.
+void Conn::_pinner(IContext *ctx) {
+    Conn *wconn = this;
+}