org.apache.ignite.internal.processors.compress

Class FileSystemUtils

java.lang.Object

org.apache.ignite.internal.processors.compress.FileSystemUtils

public final class FileSystemUtils
extends Object

Native file system API.

Constructor Summary

Constructors

Constructor and Description
FileSystemUtils()

Method Summary

Modifier and Type	Method and Description
static void	checkSupported()
static int	getFileSystemBlockSize(int fd)
static int	getFileSystemBlockSize(Path path)
static long	getSparseFileSize(int fd) !!!
static long	punchHole(int fd, long off, long len, int fsBlockSize)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

FileSystemUtils

public FileSystemUtils()

Method Detail

checkSupported

public static void checkSupported()

getFileSystemBlockSize

public static int getFileSystemBlockSize(Path path)

Parameters:

path - File system path.

Returns:

File system block size or negative value if not supported.

getFileSystemBlockSize

public static int getFileSystemBlockSize(int fd)

Parameters:

fd - Native file descriptor.

Returns:

File system block size or negative value if not supported.

getSparseFileSize

public static long getSparseFileSize(int fd)

!!! Use with caution. May produce unexpected results. Known to work correctly on Linux EXT4 and Btrfs, while on XSF it returns meaningful result only after file reopening.

Parameters:

fd - Native file descriptor.

Returns:

Approximate system dependent size of the sparse file or negative value if not supported.

punchHole

public static long punchHole(int fd,
                             long off,
                             long len,
                             int fsBlockSize)

Parameters:

fd - Native file descriptor.

off - Offset of the hole.

len - Length of the hole.

fsBlockSize - File system block size.

Returns:

Actual punched hole size.