[#9999] writecache: Drop unused

Signed-off-by: Dmitrii Stepanov <d.stepanov@yadro.com>

pkg/local_object_storage/writecache/cachebbolt.go

@@ -18,16 +18,9 @@ import (
 type cache struct {
 	options
 
-	// mtx protects statistics, counters and compressFlags.
-	mtx sync.RWMutex
-
 	mode    mode.Mode
 	modeMtx sync.RWMutex
 
-	// compressFlags maps address of a big object to boolean value indicating
-	// whether object should be compressed.
-	compressFlags map[string]struct{}
-
 	// flushCh is a channel with objects to flush.
 	flushCh chan objectInfo
 	// cancel is cancel function, protected by modeMtx in Close.
@@ -66,7 +59,6 @@ func New(opts ...Option) Cache {
 		flushCh: make(chan objectInfo),
 		mode:    mode.Disabled,
 
-		compressFlags: make(map[string]struct{}),
 		options: options{
 			log:             &logger.Logger{Logger: zap.NewNop()},
 			maxObjectSize:   defaultMaxObjectSize,

pkg/local_object_storage/writecache/put.go

@@ -115,11 +115,6 @@ func (c *cache) putBig(ctx context.Context, addr string, prm common.PutPrm) erro
 		return err
 	}
 
-	if compressor := c.blobstor.Compressor(); compressor != nil && compressor.NeedsCompression(prm.Object) {
-		c.mtx.Lock()
-		c.compressFlags[addr] = struct{}{}
-		c.mtx.Unlock()
-	}
 	storagelog.Write(c.log,
 		storagelog.AddressField(addr),
 		storagelog.StorageTypeField(wcStorageType),