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backport: fix windows file preallocation issue

This commit is contained in:
Andrei Kurushin 2017-09-28 17:45:01 +03:00 committed by Arvid Norberg
parent d0067eafe0
commit c8d51689bb
1 changed files with 1 additions and 44 deletions
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43
src/file.cpp
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@ -2075,49 +2075,7 @@ typedef struct _FILE_ALLOCATED_RANGE_BUFFER {
ec.assign(GetLastError(), system_category()); ec.assign(GetLastError(), system_category());
return false; return false;
} }
}
#if _WIN32_WINNT >= 0x0600 // only if Windows Vista or newer
if ((m_open_mode & sparse) == 0) if ((m_open_mode & sparse) == 0)
{
typedef DWORD (WINAPI *GetFileInformationByHandleEx_t)(HANDLE hFile
, FILE_INFO_BY_HANDLE_CLASS FileInformationClass
, LPVOID lpFileInformation
, DWORD dwBufferSize);
static GetFileInformationByHandleEx_t GetFileInformationByHandleEx_ = NULL;
static bool failed_kernel32 = false;
if ((GetFileInformationByHandleEx_ == NULL) && !failed_kernel32)
{
HMODULE kernel32 = LoadLibraryA("kernel32.dll");
if (kernel32)
{
GetFileInformationByHandleEx_ = (GetFileInformationByHandleEx_t)GetProcAddress(kernel32, "GetFileInformationByHandleEx");
}
else
{
failed_kernel32 = true;
}
}
offs.QuadPart = 0;
if (GetFileInformationByHandleEx_)
{
// only allocate the space if the file
// is not fully allocated
FILE_STANDARD_INFO inf;
if (GetFileInformationByHandleEx_(native_handle()
, FileStandardInfo, &inf, sizeof(inf)) == FALSE)
{
ec.assign(GetLastError(), system_category());
if (ec) return false;
}
offs = inf.AllocationSize;
}
if (offs.QuadPart < s)
{ {
// if the user has permissions, avoid filling // if the user has permissions, avoid filling
// the file with zeroes, but just fill it with // the file with zeroes, but just fill it with
@ -2125,7 +2083,6 @@ typedef struct _FILE_ALLOCATED_RANGE_BUFFER {
set_file_valid_data(m_file_handle, s); set_file_valid_data(m_file_handle, s);
} }
} }
#endif // if Windows Vista
#else // NON-WINDOWS #else // NON-WINDOWS
struct stat st; struct stat st;
if (fstat(native_handle(), &st) != 0) if (fstat(native_handle(), &st) != 0)