fs: Re-implement object layer to remember the fd (#3509)

This patch re-writes FS backend to support shared backend sharing locks for safe concurrent access across multiple servers.

cmd/utils_test.go

@@ -126,48 +126,6 @@ func TestMaxObjectSize(t *testing.T) {
 	}
 }
 
-// Test urlPathSplit.
-func TestURLPathSplit(t *testing.T) {
-	type test struct {
-		urlPath    string
-		bucketName string
-		prefixName string
-	}
-
-	testCases := []test{
-		{
-			urlPath:    "/b/c/",
-			bucketName: "b",
-			prefixName: "c/",
-		},
-		{
-			urlPath:    "c/aa",
-			bucketName: "c",
-			prefixName: "aa",
-		},
-		{
-			urlPath:    "",
-			bucketName: "",
-			prefixName: "",
-		},
-		{
-			urlPath:    "/b",
-			bucketName: "b",
-			prefixName: "",
-		},
-	}
-
-	for i, testCase := range testCases {
-		bucketName, prefixName := urlPathSplit(testCase.urlPath)
-		if bucketName != testCase.bucketName {
-			t.Errorf("Tets %d: Expected %s, %s", i+1, testCase.bucketName, bucketName)
-		}
-		if prefixName != testCase.prefixName {
-			t.Errorf("Tets %d: Expected %s, %s", i+1, testCase.bucketName, bucketName)
-		}
-	}
-}
-
 // Tests minimum allowed part size.
 func TestMinAllowedPartSize(t *testing.T) {
 	sizes := []struct {