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8264744: (fs) Use file cloning in Linux version of Files::copy method

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Reviewed-by: alanb
This commit is contained in:
Brian Burkhalter 2022-09-06 18:10:58 +00:00
parent 85d4b49151
commit da596182a4
4 changed files with 76 additions and 16 deletions
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39
src/java.base/linux/native/libnio/fs/LinuxFileSystem.c
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@ -35,9 +35,14 @@
#include <sys/sendfile.h>
#include <fcntl.h>
#include <dlfcn.h>
#include "sun_nio_fs_LinuxFileSystem.h"
typedef ssize_t copy_file_range_func(int, loff_t*, int, loff_t*, size_t,
unsigned int);
static copy_file_range_func* my_copy_file_range_func = NULL;
#define RESTARTABLE(_cmd, _result) do { \
do { \
_result = _cmd; \
@ -52,6 +57,14 @@ static void throwUnixException(JNIEnv* env, int errnum) {
}
}
JNIEXPORT void JNICALL
Java_sun_nio_fs_LinuxFileSystem_init
(JNIEnv* env, jclass this)
{
my_copy_file_range_func =
(copy_file_range_func*) dlsym(RTLD_DEFAULT, "copy_file_range");
}
// Copy all bytes from src to dst, within the kernel if possible,
// and return zero, otherwise return the appropriate status code.
//
@ -72,7 +85,33 @@ Java_sun_nio_fs_LinuxFileSystem_directCopy0
const size_t count = cancel != NULL ?
1048576 : // 1 MB to give cancellation a chance
0x7ffff000; // maximum number of bytes that sendfile() can transfer
ssize_t bytes_sent;
if (my_copy_file_range_func != NULL) {
do {
RESTARTABLE(my_copy_file_range_func(src, NULL, dst, NULL, count, 0),
bytes_sent);
if (bytes_sent < 0) {
switch (errno) {
case EINVAL:
case ENOSYS:
case EXDEV:
// ignore and try sendfile()
break;
default:
JNU_ThrowIOExceptionWithLastError(env, "Copy failed");
return IOS_THROWN;
}
}
if (cancel != NULL && *cancel != 0) {
throwUnixException(env, ECANCELED);
return IOS_THROWN;
}
} while (bytes_sent > 0);
if (bytes_sent == 0)
return 0;
}
do {
RESTARTABLE(sendfile64(dst, src, NULL, count), bytes_sent);