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/*
* Copyright (c) 2014, 2025, 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
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
/* @test
* @bug 8054029 8313368
* @requires (os.family == "linux")
* @summary FileChannel.size() should be equal to RandomAccessFile.size() and > 0 for block devs on Linux
* @comment The test must be launched with sudo or the block devices listed in
* the BLK_FNAMES array must be readable by the user running the test.
* @library /test/lib
* @run main/manual BlockDeviceSize
*/
import java.io.RandomAccessFile;
import java.nio.file.Path;
import java.nio.channels.FileChannel;
import java.nio.file.AccessDeniedException;
import java.nio.file.NoSuchFileException;
import java.util.List;
import static java.nio.file.StandardOpenOption.*;
import jtreg.SkippedException;
public class BlockDeviceSize {
private static final List<String> BLK_FNAMES = List.of("/dev/sda1", "/dev/nvme0n1", "/dev/xvda1") ;
public static void main(String[] args) throws Throwable {
for (String blkFname: BLK_FNAMES) {
Path blkPath = Path.of(blkFname);
try (FileChannel ch = FileChannel.open(blkPath, READ);
RandomAccessFile file = new RandomAccessFile(blkFname, "r")) {
long size1 = ch.size();
long size2 = file.length();
if (size1 != size2) {
throw new RuntimeException("size differs when retrieved" +
" in different ways: " + size1 + " != " + size2);
}
if (size1 <= 0) {
throw new RuntimeException("size() for a block device size returns zero or a negative value");
}
System.out.println("OK");
} catch (NoSuchFileException nsfe) {
System.err.println("File " + blkFname + " not found." +
" Skipping test");
} catch (AccessDeniedException ade) {
throw new SkippedException("Access to " + blkFname + " is denied."
+ " Run test as root.", ade);
}
}
}
}
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