Deletion of subfolders of multipart (#6961)

Delete subfolders under multipart folder upon completion of CompleteMultipartUpload, AbortMultipartUpload and cleanupStaleMultipartUploads functions

cmd/fs-v1-multipart.go

@@ -682,6 +682,8 @@ func (fs *FSObjects) CompleteMultipartUpload(ctx context.Context, bucket string,
 		return oi, toObjectErr(err, bucket, object)
 	}
 	fsRemoveAll(ctx, uploadIDDir)
+	// It is safe to ignore any directory not empty error (in case there were multiple uploadIDs on the same object)
+	fsRemoveDir(ctx, fs.getMultipartSHADir(bucket, object))
 	fi, err := fsStatFile(ctx, pathJoin(fs.fsPath, bucket, object))
 	if err != nil {
 		return oi, toObjectErr(err, bucket, object)
@@ -769,6 +771,9 @@ func (fs *FSObjects) cleanupStaleMultipartUploads(ctx context.Context, cleanupIn
 					}
 					if now.Sub(fi.ModTime()) > expiry {
 						fsRemoveAll(ctx, pathJoin(fs.fsPath, minioMetaMultipartBucket, entry, uploadID))
+						// It is safe to ignore any directory not empty error (in case there were multiple uploadIDs on the same object)
+						fsRemoveDir(ctx, pathJoin(fs.fsPath, minioMetaMultipartBucket, entry))
+
 					}
 				}
 			}