private static unsafe void Preallocate(string fullPath, long preallocationSize, SafeFileHandle fileHandle)
{
var allocationInfo = new Interop.Kernel32.FILE_ALLOCATION_INFO
{
AllocationSize = preallocationSize
};
if (!Interop.Kernel32.SetFileInformationByHandle(
fileHandle,
Interop.Kernel32.FileAllocationInfo,
&allocationInfo,
(uint)sizeof(Interop.Kernel32.FILE_ALLOCATION_INFO)))
{
int errorCode = Marshal.GetLastPInvokeError();
// Only throw for errors that indicate there is not enough space.
if (errorCode == Interop.Errors.ERROR_DISK_FULL ||
errorCode == Interop.Errors.ERROR_FILE_TOO_LARGE)
{
fileHandle.Dispose();
// Delete the file we've created.
Interop.Kernel32.DeleteFile(fullPath);
throw new IOException(SR.Format(errorCode == Interop.Errors.ERROR_DISK_FULL
? SR.IO_DiskFull_Path_AllocationSize
: SR.IO_FileTooLarge_Path_AllocationSize,
fullPath, preallocationSize));
}
}
}
private static unsafe void Preallocate(string fullPath, long preallocationSize, SafeFileHandle fileHandle)
{
var allocationInfo = new Interop.Kernel32.FILE_ALLOCATION_INFO
{
AllocationSize = preallocationSize
};
if (!Interop.Kernel32.SetFileInformationByHandle(
fileHandle,
Interop.Kernel32.FileAllocationInfo,
&allocationInfo,
(uint)sizeof(Interop.Kernel32.FILE_ALLOCATION_INFO)))
{
int errorCode = Marshal.GetLastPInvokeError();
// we try to mimic the atomic NtCreateFile here:
// if preallocation fails, close the handle and delete the file
fileHandle.Dispose();
Interop.Kernel32.DeleteFile(fullPath);
switch (errorCode)
{
case Interop.Errors.ERROR_DISK_FULL:
throw new IOException(SR.Format(SR.IO_DiskFull_Path_AllocationSize, fullPath, preallocationSize));
case Interop.Errors.ERROR_FILE_TOO_LARGE:
throw new IOException(SR.Format(SR.IO_FileTooLarge_Path_AllocationSize, fullPath, preallocationSize));
default:
throw Win32Marshal.GetExceptionForWin32Error(errorCode, fullPath);
}
}
}
