.

wcfs/wcfs.go

@@ -1828,7 +1828,8 @@ func (head *Head) bigopen(ctx context.Context, oid zodb.Oid) (_ *BigFile, err er
 		head.bfdir.δFtail.Track(f, -1, sizePath, nil)
 		head.bfdir.δFmu.Unlock()
 
-//		f.δtail = NewΔTailI64(zconn.At())
+		// FIXME: scan zfile.blktab - so that we can detect all btree changes
+		// see  "XXX building δFtail lazily ..." in notes.txt
 	}
 
 	return f, nil

wcfs/wcfs_test.py

@@ -296,6 +296,16 @@ class tDB:
         return "@at%d (%s)" % (i, h(at))
 
 
+    # zfiles returns ZBigFiles that were ever changed under t.
+    def zfiles(t):
+        zfs = set()
+        for dF in t.dFtail:
+            for zf in dF.byfile:
+                if zf not in zfs:
+                    zfs.add(zf)
+        return zfs
+
+
 
 # tFile provides testing environment for one bigfile on wcfs.
 #
@@ -702,7 +712,7 @@ def test_wcfs():
 
     # checkSetupWatch verifies setting up new watch for zf@at.
     def checkSetupWatch(zf, at):
-        print('C: check setup watch f<%s> %s' % (h(zf._p_oid), t.hat(at)))
+        print('\nC: check setup watch f<%s> %s' % (h(zf._p_oid), t.hat(at)))
 
         # all changes to zf
         vdf = [_.byfile[zf] for _ in t.dFtail if zf in _.byfile]
@@ -744,9 +754,8 @@ def test_wcfs():
 
         wg.wait()
 
-    # XXX for zf: check all revisions, even if zf was not changed in rev
+    for zf in t.zfiles():
         for dF in t.dFtail:
-        for zf in dF.byfile:
             checkSetupWatch(zf, dF.rev)