cache: remove the unused old gc primitives

Signed-off-by: Tonis Tiigi <tonistiigi@gmail.com>

cache/gc.go

@@ -1,27 +0,0 @@
-package cache
-
-import (
-	"context"
-	"errors"
-	"time"
-)
-
-// GCPolicy defines policy for garbage collection
-type GCPolicy struct {
-	MaxSize         uint64
-	MaxKeepDuration time.Duration
-}
-
-// // CachePolicy defines policy for keeping a resource in cache
-// type CachePolicy struct {
-// 	Priority int
-// 	LastUsed time.Time
-// }
-//
-// func defaultCachePolicy() CachePolicy {
-// 	return CachePolicy{Priority: 10, LastUsed: time.Now()}
-// }
-
-func (cm *cacheManager) GC(ctx context.Context) error {
-	return errors.New("GC not implemented")
-}

cache/manager.go

@@ -25,7 +25,6 @@ var (
 
 type ManagerOpt struct {
 	Snapshotter     snapshot.SnapshotterBase
-	GCPolicy        GCPolicy
 	MetadataStore   *metadata.Store
 	PruneRefChecker ExternalRefCheckerFunc
 }
@@ -40,7 +39,6 @@ type Accessor interface {
 type Controller interface {
 	DiskUsage(ctx context.Context, info client.DiskUsageInfo) ([]*client.UsageInfo, error)
 	Prune(ctx context.Context, ch chan client.UsageInfo, info ...client.PruneInfo) error
-	GC(ctx context.Context) error
 }
 
 type Manager interface {