8313368: (fc) FileChannel.size returns 0 on block special files

Reviewed-by: vtewari, alanb

Author: Brian Burkhalter

src/java.base/unix/native/libnio/ch/UnixFileDispatcherImpl.c

@@ -45,6 +45,11 @@
 #define fstatvfs64 fstatvfs
 #endif
 
+#if defined(__linux__)
+#include <linux/fs.h>
+#include <sys/ioctl.h>
+#endif
+
 #include "jni.h"
 #include "nio.h"
 #include "nio_util.h"
@@ -169,7 +174,7 @@ Java_sun_nio_ch_UnixFileDispatcherImpl_size0(JNIEnv *env, jobject this, jobject
     if (fstat64(fd, &fbuf) < 0)
         return handle(env, -1, "Size failed");
 
-#ifdef BLKGETSIZE64
+#if defined(__linux__)
     if (S_ISBLK(fbuf.st_mode)) {
         uint64_t size;
         if (ioctl(fd, BLKGETSIZE64, &size) < 0)

test/jdk/java/nio/channels/FileChannel/BlockDeviceSize.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2014, 2021, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2014, 2023, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -22,9 +22,10 @@
  */
 
 /* @test
- * @bug 8054029
+ * @bug 8054029 8313368
  * @requires (os.family == "linux")
  * @summary Block devices should not report size=0 on Linux
+ * @run main/manual BlockDeviceSize
  */
 
 import java.io.RandomAccessFile;
@@ -56,8 +57,8 @@ public static void main(String[] args) throws Throwable {
             System.err.println("File " + BLK_FNAME + " not found." +
                     " Skipping test");
         } catch (AccessDeniedException ade) {
-            System.err.println("Access to " + BLK_FNAME + " is denied." +
-                    " Run test as root.");
+            throw new RuntimeException("Access to " + BLK_FNAME + " is denied."
+                    + " Run test as root.", ade);
         }
     }
 }