Пример #1
0
  @Test
  public void preallocateGrowShrink() throws Exception {
    FileIO fio = FileIO.open(file, EnumSet.of(OpenOption.CREATE, OpenOption.PREALLOCATE));
    for (long len = 0; len <= 50_000L; len += 5000L) {
      fio.setLength(len);
      assertEquals(len, fio.length());
    }
    for (long len = 50_000L; len >= 0; len -= 5000L) {
      fio.setLength(len);
      assertEquals(len, fio.length());
    }

    fio.close();
  }
Пример #2
0
  @Ignore
  @Test
  public void crash() throws Exception {
    // Reproduces SIGBUS crash. Requires writing direct buffers
    // to a mapped file when there is not enough space left. To avoid having
    // to fill up a primary device use a small ramdisk, or loop device. E.g.
    //   $ dd if=/dev/zero of=file.img bs=1M count=100
    //   $ losetup /dev/loop0 file.img
    //   $ mkfs.ext4 /dev/loop0
    //   $ mkdir -p root
    //   $ mount -t ext4 /dev/loop0 root

    assumeTrue(Platform.isLinux());
    File f = new File("root/test.file");
    if (f.exists()) f.delete();

    FileIO fio = FileIO.open(f, EnumSet.of(OpenOption.CREATE, OpenOption.PREALLOCATE));
    final long len = f.getTotalSpace() * 5L;
    fio.setLength(len);
    fio.map();

    ByteBuffer bb = ByteBuffer.allocateDirect(4097);
    for (long pos = 0; pos < len - bb.remaining(); pos += 512) {
      fio.write(pos, bb);
      bb.flip();
    }

    fio.close();
  }
Пример #3
0
  @Test
  public void preallocateTooLarge() throws Exception {
    assumeTrue(Platform.isLinux());
    FileIO fio =
        FileIO.open(file, EnumSet.of(OpenOption.CREATE, OpenOption.MAPPED, OpenOption.PREALLOCATE));

    FileStore fs = Files.getFileStore(file.toPath());
    assumeTrue("ext4".equals(fs.type()) && !fs.name().contains("docker"));

    long len = file.getTotalSpace() * 100L;
    // setLength traps the IOException and prevents resizing / remapping. Not remapping avoids
    // the SIGBUS issue.
    fio.setLength(len);
    assertEquals(0, fio.length());

    fio.close();
  }
Пример #4
0
  @Test
  public void preallocate() throws Exception {
    // Assuming a filesystem with delayed block allocation,
    // e.g. ext3 / ext4 on Linux.
    assumeTrue(Platform.isLinux() || Platform.isMac());

    long len = 100L * (1 << 20); // 100 MB
    FileIO fio = FileIO.open(file, EnumSet.of(OpenOption.CREATE, OpenOption.PREALLOCATE));
    long startFree = file.getFreeSpace();

    fio.setLength(len);
    long alloc = startFree - file.getFreeSpace();

    // Free space should be reduced. Pad expectation since external
    // events may interfere.
    assertTrue(alloc > (len >> 1));

    fio.close();
  }