.

bigfile/file_zodb.cpp

@@ -45,8 +45,11 @@ static void* zfile_mmap_setup_read(VMA *vma, BigFile *file, blk_t blk, size_t bl
 }
 
 static int zfile_remmap_blk_read(VMA *vma, BigFile *file, blk_t blk) {
-    wcfs::_Mapping *mmap = static_cast<wcfs::_Mapping*>(vma->mmap_overlay_server);
-    // XXX use file?
+    wcfs::_Mapping* mmap   = static_cast<wcfs::_Mapping*>(vma->mmap_overlay_server);
+    _ZBigFile*      _zfile = container_of(file, _ZBigFile, __pyx_base.file);
+
+    if (mmap->fileh != _zfile->wfileh)
+        panic("BUG: zfile_remmap_blk_read: vma and _zfile point to different wcfs::FileH");
 
     error err;
     err = mmap->remmap_blk(blk);
@@ -57,8 +60,13 @@ static int zfile_remmap_blk_read(VMA *vma, BigFile *file, blk_t blk) {
 
 
 static void zfile_munmap(VMA *vma, BigFile *file) {
+    wcfs::_Mapping* mmap   = static_cast<wcfs::_Mapping*>(vma->mmap_overlay_server);
+    _ZBigFile*      _zfile = container_of(file, _ZBigFile, __pyx_base.file);
+
+    if (mmap->fileh != _zfile->wfileh)
+        panic("BUG: zfile_remmap_blk_read: vma and _zfile point to different wcfs::FileH");
+
     error err;
-    wcfs::_Mapping *mmap = static_cast<wcfs::_Mapping*>(vma->mmap_overlay_server);
 
     err = mmap->unmap();
     if (err != nil)

wcfs/client/wcfs.cpp

@@ -46,6 +46,9 @@
 //
 
 // XXX locking -> explain atMu + slaves and refer to "Locking" in wcfs.go
+//
+// XXX link to bigfile/file_zodb.cpp to show how wcfs/client is used for
+// ZBigFile on client side.
 
 
 #include "wcfs_misc.h"