Fix issues with multipart upload

pkg/donut/cache/data/data.go

@@ -85,8 +85,6 @@ func (r *Cache) SetMaxSize(maxSize uint64) {
 
 // Stats get current cache statistics
 func (r *Cache) Stats() Stats {
-	r.Lock()
-	defer r.Unlock()
 	return Stats{
 		Bytes:   r.currentSize,
 		Items:   r.items.Len(),

pkg/donut/donut-v2.go

@@ -113,7 +113,12 @@ func New() (Interface, error) {
 			return nil, iodine.New(err, nil)
 		}
 		for k, v := range buckets {
-			a.storedBuckets.Set(k, v)
+			var newBucket = storedBucket{}
+			newBucket.objectMetadata = make(map[string]ObjectMetadata)
+			newBucket.multiPartSession = make(map[string]MultiPartSession)
+			newBucket.partMetadata = make(map[int]PartMetadata)
+			newBucket.bucketMetadata = v
+			a.storedBuckets.Set(k, newBucket)
 		}
 	}
 	return a, nil

pkg/donut/donut-v2_test.go

@@ -22,6 +22,8 @@ import (
 	"encoding/base64"
 	"encoding/hex"
 	"io/ioutil"
+	"os"
+	"path/filepath"
 	"testing"
 
 	. "github.com/minio/check"
@@ -29,13 +31,20 @@ import (
 
 func TestCache(t *testing.T) { TestingT(t) }
 
-type MyCacheSuite struct{}
+type MyCacheSuite struct {
+	root string
+}
 
 var _ = Suite(&MyCacheSuite{})
 
 var dc Interface
 
 func (s *MyCacheSuite) SetUpSuite(c *C) {
+	root, err := ioutil.TempDir(os.TempDir(), "donut-")
+	c.Assert(err, IsNil)
+	s.root = root
+
+	customConfigPath = filepath.Join(root, "donut.json")
 	var err error
 	dc, err = New()
 	c.Assert(err, IsNil)
@@ -46,6 +55,10 @@ func (s *MyCacheSuite) SetUpSuite(c *C) {
 	c.Assert(len(buckets), Equals, 0)
 }
 
+func (s *MyDonutSuite) TearDownSuite(c *C) {
+	os.RemoveAll(s.root)
+}
+
 // test make bucket without name
 func (s *MyCacheSuite) TestBucketWithoutNameFails(c *C) {
 	// fail to create new bucket without a name