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/* $Id: RTFileCopyPartEx-linux.cpp $ */
/** @file
* IPRT - RTFileCopyPartEx, linux specific implementation.
*/
/*
* Copyright (C) 2006-2023 Oracle and/or its affiliates.
*
* This file is part of VirtualBox base platform packages, as
* available from https://www.virtualbox.org.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation, in version 3 of the
* License.
*
* This program 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 for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see <https://www.gnu.org/licenses>.
*
* The contents of this file may alternatively be used under the terms
* of the Common Development and Distribution License Version 1.0
* (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
* in the VirtualBox distribution, in which case the provisions of the
* CDDL are applicable instead of those of the GPL.
*
* You may elect to license modified versions of this file under the
* terms and conditions of either the GPL or the CDDL or both.
*
* SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
*/
/*********************************************************************************************************************************
* Header Files *
*********************************************************************************************************************************/
#include <iprt/file.h>
#include "internal/iprt.h"
#include <iprt/asm.h>
#include <iprt/assert.h>
#include <iprt/err.h>
#include <errno.h>
#include <unistd.h>
#include <sys/syscall.h>
#ifndef __NR_copy_file_range
# if defined(RT_ARCH_X86)
# define __NR_copy_file_range 377
# elif defined(RT_ARCH_AMD64)
# define __NR_copy_file_range 326
# endif
#endif
#ifndef __NR_copy_file_range
# include "../../generic/RTFileCopyPartEx-generic.cpp"
#else /* __NR_copy_file_range - whole file */
/* Include the generic code as a fallback since copy_file_range is rather new . */
# define IPRT_FALLBACK_VERSION
# include "../../generic/RTFileCopyPartEx-generic.cpp"
# undef IPRT_FALLBACK_VERSION
/*********************************************************************************************************************************
* Global Variables *
*********************************************************************************************************************************/
static int32_t volatile g_fCopyFileRangeSupported = -1;
DECLINLINE(loff_t)
MyCopyFileRangeSysCall(int fdIn, loff_t *poffIn, int fdOut, loff_t *poffOut, size_t cbChunk, unsigned int fFlags)
{
return syscall(__NR_copy_file_range, fdIn, poffIn, fdOut, poffOut, cbChunk, fFlags);
}
DECL_NO_INLINE(static, bool) HasCopyFileRangeSyscallSlow(void)
{
errno = 0;
MyCopyFileRangeSysCall(-1, NULL, -1, NULL, 4096, 0);
if (errno != ENOSYS)
{
ASMAtomicWriteS32(&g_fCopyFileRangeSupported, 1);
return true;
}
ASMAtomicWriteS32(&g_fCopyFileRangeSupported, 0);
return false;
}
DECLINLINE(bool) HasCopyFileRangeSyscall(void)
{
int32_t i = ASMAtomicUoReadS32(&g_fCopyFileRangeSupported);
if (i != -1)
return i == 1;
return HasCopyFileRangeSyscallSlow();
}
RTDECL(int) RTFileCopyPartPrep(PRTFILECOPYPARTBUFSTATE pBufState, uint64_t cbToCopy)
{
if (HasCopyFileRangeSyscall())
{
pBufState->iAllocType = -42;
pBufState->pbBuf = NULL;
pBufState->cbBuf = 0;
pBufState->uMagic = RTFILECOPYPARTBUFSTATE_MAGIC;
return VINF_SUCCESS;
}
return rtFileCopyPartPrepFallback(pBufState, cbToCopy);
}
RTDECL(void) RTFileCopyPartCleanup(PRTFILECOPYPARTBUFSTATE pBufState)
{
return rtFileCopyPartCleanupFallback(pBufState);
}
RTDECL(int) RTFileCopyPartEx(RTFILE hFileSrc, RTFOFF offSrc, RTFILE hFileDst, RTFOFF offDst, uint64_t cbToCopy,
uint32_t fFlags, PRTFILECOPYPARTBUFSTATE pBufState, uint64_t *pcbCopied)
{
/*
* Validate input.
*/
if (pcbCopied)
*pcbCopied = 0;
AssertReturn(pBufState->uMagic == RTFILECOPYPARTBUFSTATE_MAGIC, VERR_INVALID_FLAGS);
if (pBufState->iAllocType == -42)
{ /* more and more likely as time goes */ }
else
return rtFileCopyPartExFallback(hFileSrc, offSrc, hFileDst, offDst, cbToCopy, fFlags, pBufState, pcbCopied);
AssertReturn(offSrc >= 0, VERR_NEGATIVE_SEEK);
AssertReturn(offDst >= 0, VERR_NEGATIVE_SEEK);
AssertReturn(!fFlags, VERR_INVALID_FLAGS);
/*
* If nothing to copy, return right away.
*/
if (!cbToCopy)
return VINF_SUCCESS;
/*
* Do the copying.
*/
uint64_t cbCopied = 0;
int rc = VINF_SUCCESS;
do
{
size_t cbThisCopy = (size_t)RT_MIN(cbToCopy - cbCopied, _1G);
loff_t offThisDst = offSrc + cbCopied;
loff_t offThisSrc = offDst + cbCopied;
ssize_t cbActual = MyCopyFileRangeSysCall((int)RTFileToNative(hFileSrc), &offThisSrc,
(int)RTFileToNative(hFileDst), &offThisDst,
cbThisCopy, 0);
if (cbActual < 0)
{
rc = errno;
Assert(rc != 0);
rc = rc != 0 ? RTErrConvertFromErrno(rc) : VERR_READ_ERROR;
if (rc != VERR_NOT_SAME_DEVICE || cbCopied != 0)
break;
/* Fall back to generic implementation if the syscall refuses to handle the case. */
rc = rtFileCopyPartPrepFallback(pBufState, cbToCopy);
if (RT_SUCCESS(rc))
return rtFileCopyPartExFallback(hFileSrc, offSrc, hFileDst, offDst, cbToCopy, fFlags, pBufState, pcbCopied);
return rc;
}
Assert(offThisSrc == offSrc + (int64_t)cbCopied + cbActual);
Assert(offThisDst == offDst + (int64_t)cbCopied + cbActual);
if (cbActual == 0)
{
if (!pcbCopied)
rc = VERR_EOF;
break;
}
cbCopied += cbActual;
} while (cbCopied < cbToCopy);
if (pcbCopied)
*pcbCopied = cbCopied;
return rc;
}
#endif /* __NR_copy_file_range */
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