XL/mutltipart: fix partnumber to partname association. (#1739)

Fixes #1738

docs/backend/json-files/fs/fs.json

@@ -6,7 +6,7 @@
     },
     "parts": [
         {
-            "name": "object1",
+            "name": "object00001",
             "size": 29,
             "eTag": "",
         },

docs/backend/json-files/xl/xl.json

@@ -3,17 +3,17 @@
         {
             "size": 5242880,
             "etag": "3565c6e741e69a007a5ac7db893a62b5",
-            "name": "object1"
+            "name": "object00001"
         },
         {
             "size": 5242880,
             "etag": "d416712335c280ab1e39498552937764",
-            "name": "object2"
+            "name": "object00002"
         },
         {
             "size": 4338324,
             "etag": "8a98c5c54d81c6c95ed9bdcaeb941aaf",
-            "name": "object3"
+            "name": "object00003"
         }
     ],
     "meta": {

xl-v1-multipart.go

@@ -125,7 +125,7 @@ func (xl xlObjects) putObjectPartCommon(bucket string, object string, uploadID s
 	nsMutex.Lock(minioMetaBucket, pathJoin(mpartMetaPrefix, bucket, object, uploadID, strconv.Itoa(partID)))
 	defer nsMutex.Unlock(minioMetaBucket, pathJoin(mpartMetaPrefix, bucket, object, uploadID, strconv.Itoa(partID)))
 
-	partSuffix := fmt.Sprintf("object%d", partID)
+	partSuffix := fmt.Sprintf("object.%.5d", partID)
 	tmpPartPath := path.Join(tmpMetaPrefix, bucket, object, uploadID, partSuffix)
 	fileWriter, err := xl.erasureDisk.CreateFile(minioMetaBucket, tmpPartPath)
 	if err != nil {
@@ -318,7 +318,7 @@ func (xl xlObjects) CompleteMultipartUpload(bucket string, object string, upload
 	// Loop through all parts, validate them and then commit to disk.
 	for i, part := range parts {
 		// Construct part suffix.
-		partSuffix := fmt.Sprintf("object%d", part.PartNumber)
+		partSuffix := fmt.Sprintf("object.%.5d", part.PartNumber)
 		if xlMeta.SearchObjectPart(partSuffix, part.ETag) == -1 {
 			return "", InvalidPart{}
 		}

xl-v1-object.go

@@ -191,7 +191,7 @@ func (xl xlObjects) PutObject(bucket string, object string, size int64, data io.
 	nsMutex.Lock(bucket, object)
 	defer nsMutex.Unlock(bucket, object)
 
-	tempErasureObj := path.Join(tmpMetaPrefix, bucket, object, "object1")
+	tempErasureObj := path.Join(tmpMetaPrefix, bucket, object, "object00001")
 	tempObj := path.Join(tmpMetaPrefix, bucket, object)
 	fileWriter, err := xl.erasureDisk.CreateFile(minioMetaBucket, tempErasureObj)
 	if err != nil {
@@ -283,7 +283,7 @@ func (xl xlObjects) PutObject(bucket string, object string, size int64, data io.
 	xlMeta.Meta = metadata
 	xlMeta.Stat.Size = size
 	xlMeta.Stat.ModTime = modTime
-	xlMeta.AddObjectPart("object1", newMD5Hex, xlMeta.Stat.Size)
+	xlMeta.AddObjectPart("object00001", newMD5Hex, xlMeta.Stat.Size)
 	if err = xl.writeXLMetadata(bucket, object, xlMeta); err != nil {
 		return "", toObjectErr(err, bucket, object)
 	}