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8293121: (fs) Refactor UnixFileSystem copying into generic Unix, Linux, and BSD implementations

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Reviewed-by: alanb
This commit is contained in:
Brian Burkhalter 2022-09-01 22:21:21 +00:00
parent 032be168b5
commit 0a4d0cee9f
11 changed files with 1051 additions and 854 deletions
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62
src/java.base/linux/classes/sun/nio/fs/LinuxFileSystem.java
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@ -1,5 +1,5 @@
/*
* Copyright (c) 2008, 2019, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 2008, 2022, 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
@ -25,10 +25,16 @@
package sun.nio.fs;
import java.nio.file.*;
import java.nio.file.FileStore;
import java.nio.file.WatchService;
import java.io.IOException;
import java.util.*;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
import static sun.nio.fs.LinuxNativeDispatcher.*;
import static sun.nio.fs.UnixConstants.*;
/**
* Linux implementation of FileSystem
@ -121,10 +127,56 @@ class LinuxFileSystem extends UnixFileSystem {
return getMountEntries("/etc/mtab");
}
@Override
FileStore getFileStore(UnixMountEntry entry) throws IOException {
return new LinuxFileStore(this, entry);
}
// --- file copying ---
@Override
void bufferedCopy(int dst, int src, long address,
int size, long addressToPollForCancel)
throws UnixException
{
int advice = POSIX_FADV_SEQUENTIAL | // sequential data access
POSIX_FADV_NOREUSE | // will access only once
POSIX_FADV_WILLNEED; // will access in near future
posix_fadvise(src, 0, 0, advice);
super.bufferedCopy(dst, src, address, size, addressToPollForCancel);
}
@Override
int directCopy(int dst, int src, long addressToPollForCancel)
throws UnixException
{
int advice = POSIX_FADV_SEQUENTIAL | // sequential data access
POSIX_FADV_NOREUSE | // will access only once
POSIX_FADV_WILLNEED; // will access in near future
posix_fadvise(src, 0, 0, advice);
return directCopy0(dst, src, addressToPollForCancel);
}
// -- native methods --
/**
* Copies data between file descriptors {@code src} and {@code dst} using
* a platform-specific function or system call possibly having kernel
* support.
*
* @param dst destination file descriptor
* @param src source file descriptor
* @param addressToPollForCancel address to check for cancellation
* (a non-zero value written to this address indicates cancel)
*
* @return 0 on success, UNAVAILABLE if the platform function would block,
* UNSUPPORTED_CASE if the call does not work with the given
* parameters, or UNSUPPORTED if direct copying is not supported
* on this platform
*/
private static native int directCopy0(int dst, int src,
long addressToPollForCancel)
throws UnixException;
}