.

wcfs/internal/wcfs_virtmem.cpp

@@ -57,6 +57,10 @@ typedef uint64_t Oid;   // XXX ok?
 // TidHead is invalid Tid which is larged Tid value and means @head
 const Tid TidHead = -1ULL;
 
+string h(uint64_t v); // v -> 016x hex representation
+#define h_(v)   (h(v).c_str())
+
+
 // XXX ok?
 struct IContext {
     virtual chan<structZ> done() = 0;
@@ -250,7 +254,7 @@ error _Mapping::_remmapblk(int64_t blk, Tid at) {
     else {
         // TODO share @rev fd until wconn is resynced?
         tie(fsfile, err) = f->wconn->_wc->_open(
-                fmt::sprintf("@%s/bigfile/%s", h(at), h(f->foid), "rb");
+                fmt::sprintf("@%s/bigfile/%s", h_(at), h_(f->foid)), "rb");
         if (err != nil)
             return err;
         defer(fsfile.close);
@@ -290,3 +294,10 @@ tuple<os::File, error> WCFS::_open(const string &path/*, XXX mode*/) {
     string path_ = wc->_path(path);
     return os::open(path_/*, XXX mode*/);
 }
+
+
+// ---- misc ----
+
+string h(uint64_t v) {
+    return fmt::sprintf("%016x", v);
+}