.

wcfs/δftail.go

@@ -94,50 +94,13 @@ type ΔFile struct {
 }
 
 
-// XXX doc
-/*
-	// bindFile associates ZBlk as being used by file to store block #blk.
-	//
-	// A ZBlk may be bound to several blocks inside one file, and to
-	// several files.
-	//
-	// The information is preserved even when ZBlk comes to ghost
-	// state, but is lost if ZBlk is garbage collected.
-	//
-	// it is safe to call multiple bindFile simultaneously.
-	// it is not safe to call bindFile and boundTo simultaneously.
-	//
-	// XXX link to overview.
-	bindFile(file *BigFile, blk int64)
-
-	// XXX unbindFile
-	// XXX zfile -> bind map for it
-
-	// blkBoundTo returns ZBlk association with file(s)/#blk(s).
-	//
-	// The association returned is that was previously set by bindFile.
-	//
-	// blkBoundTo must not be called simultaneously wrt bindFile.
-	blkBoundTo() map[*BigFile]SetI64
-*/
-// XXX -> _IInΔFtail ?
-type _ZBlkInΔFtail interface {
-	// inΔFtail returns pointer to struct zblkInΔFtail embedded into this ZBlk.
-	//
-	// this structure is volatile in-RAM only and is used to track
-	// ZBlk->File|parent(XXX) relation for data blocks loaded with this ZBlk.
-	//
-	// XXX data stored by zBlkBase is transient - it is _not_ included into persistent state
-	inΔFtail() *zblkInΔFtail
-
-}
-
-// zblkInΔFtail is part of ΔFtail embedded into ZBlk*.
+// zblkInΔFtail is ΔFtail-related volatile data embedded into ZBlk*.
 //
-// The data stored by zblkInΔFtail is transient - it is _not_ included into
+// The data is preserved even when ZBlk comes to ghost state, but is lost if
+// ZBlk is garbage collected. The data is transient - it is _not_ included into
 // persistent state.
 type zblkInΔFtail struct {
-	mu  sync.Mutex          // used only for binding to support multiple loaders
+	mu sync.Mutex // to support multiple concurrent loaders
 
 	// XXX change vvv to intree_parent? {} Bucket -> set(#blk)
 	// (this is uniform with building in-RAM reverse child->parents relation for
@@ -147,6 +110,7 @@ type zblkInΔFtail struct {
 	infile map[*BigFile]SetI64 // {} file -> set(#blk)
 }
 
+type _ZBlkInΔFtail interface { inΔFtail() *zblkInΔFtail }
 func (z *zblkInΔFtail) inΔFtail() *zblkInΔFtail { return z }
 
 // NewΔFtail creates new ΔFtail object.