.

bigfile/file_zodb.cpp

@@ -34,6 +34,9 @@ static void* zfile_mmap_setup_read(VMA *vma, BigFile *file, blk_t blk, size_t bl
     wcfs::Mapping mmap;
     error err;
 
+    if (fileh == nil)
+        panic("BUG: zfile_mmap_setup_read: ZBigFile.fileh_open did not set .wfileh");
+
     tie(mmap, err) = fileh->mmap(blk, blklen, vma);
     if (err != nil)
         panic("TODO");  // XXX

wcfs/internal/wcfs_virtmem.cpp

@@ -259,7 +259,7 @@ pair<FileH, error> _Conn::open(zodb::Oid foid) {
 
     FileH f; bool ok;
     tie(f, ok) = wconn._filehtab.get(foid);
-    if (f == nil) {
+    if (f != nil) {
         // XXX incref open count?
         return make_pair(f, nil);
     }