Move fallocate test to linux specific too. Check kernel

interface version.

fuse/loopback_linux_test.go

@@ -40,3 +40,31 @@ func clearStatfs(s *syscall.Statfs_t) {
 	// TODO - figure out what this is for.
 	s.Flags = 0
 }
+
+func TestFallocate(t *testing.T) {
+	ts := NewTestCase(t)
+	defer ts.Cleanup()
+
+	if ts.state.KernelSettings().Minor < 19 {
+		t.Log("FUSE does not support Fallocate.")
+		return
+	}
+
+	rwFile, err := os.OpenFile(ts.mnt+"/file", os.O_CREATE|os.O_WRONLY|os.O_TRUNC, 0666)
+	if err != nil {
+		t.Fatalf("OpenFile failed: %v", err)
+	}
+	defer rwFile.Close()
+	err = syscall.Fallocate(int(rwFile.Fd()), 0, 1024, 4096)
+	if err != nil {
+		t.Fatalf("FUSE Fallocate failed: %v", err)
+	}
+	fi, err := os.Lstat(ts.orig + "/file")
+	if err != nil {
+		t.Fatalf("Lstat failed: %v", err)
+	}
+	if fi.Size() < (1024 + 4096) {
+		t.Fatalf("fallocate should have changed file size. Got %d bytes",
+			fi.Size())
+	}
+}

fuse/loopback_test.go

@@ -979,25 +979,3 @@ func TestUmask(t *testing.T) {
 		t.Errorf("got %o, expect mode %o for file %s", got, expect, fn)
 	}
 }
-
-func TestFallocate(t *testing.T) {
-	ts := NewTestCase(t)
-	defer ts.Cleanup()
-	rwFile, err := os.OpenFile(ts.mnt+"/file", os.O_CREATE|os.O_WRONLY|os.O_TRUNC, 0666)
-	if err != nil {
-		t.Fatalf("OpenFile failed: %v", err)
-	}
-	defer rwFile.Close()
-	err = syscall.Fallocate(int(rwFile.Fd()), 0, 1024, 4096)
-	if err != nil {
-		t.Fatalf("Fallocate failed: %v", err)
-	}
-	fi, err := os.Lstat(ts.orig + "/file")
-	if err != nil {
-		t.Fatalf("Lstat failed: %v", err)
-	}
-	if fi.Size() < (1024 + 4096) {
-		t.Fatalf("fallocate should have changed file size. Got %d bytes",
-			fi.Size())
-	}
-}