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wcfs/δftail.go

@@ -92,6 +92,10 @@ func (δf *ΔFTail) Update(δZ *zodb.EventCommit) ΔFentry {
 //
 // XXX -> merge into ZBigFile.LoadBlk?
 // XXX ZBigFile.LoadBlk(blk) -> blkdata, rev
+//
+// XXX no - cannot merge - f.LastBlkRev is used for both @head (where we have
+// zblk.rev) and for @w.at, where we don't have zblk.rev because we was not
+// handling load and just need to pin watcher with the result.
 func (δf *ΔFTail) LastRevOf(file *BigFile, blk int64, at zodb.Tid) (_ zodb.Tid, exact bool) {
 	// revision of when blktab[blk] entry changed last.
 	treeKeyRev, exact := δf.ΔTail.LastRevOf(file.zfile.blktab, blk, at)	// XXX activate?