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NTDirectoryFileSystem: CreateFile: Workaround for using FILE_NO_INTERMEDIATE_BUFFERING and FILE_APPEND_DATA together

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Tal Aloni 2017-07-26 20:52:37 +03:00
parent e5eb4e2f81
commit fdaafdfa9c
1 changed files with 8 additions and 0 deletions
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8
SMBLibrary/Win32/NTFileStore/NTDirectoryFileSystem.cs
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@ -161,6 +161,14 @@ namespace SMBLibrary.Win32
createOptions &= ~CreateOptions.FILE_SYNCHRONOUS_IO_NONALERT;
createOptions |= CreateOptions.FILE_SYNCHRONOUS_IO_ALERT;
if ((createOptions & CreateOptions.FILE_NO_INTERMEDIATE_BUFFERING) > 0 &&
(desiredAccess.File & FileAccessMask.FILE_APPEND_DATA) > 0)
{
// FILE_NO_INTERMEDIATE_BUFFERING is incompatible with FILE_APPEND_DATA
// [MS-SMB2] 3.3.5.9 suggests setting FILE_APPEND_DATA to zero in this case.
desiredAccess = (AccessMask)((uint)desiredAccess & (uint)~FileAccessMask.FILE_APPEND_DATA);
}
NTStatus status = CreateFile(out fileHandle, out fileStatus, nativePath, desiredAccess, 0, fileAttributes, shareAccess, createDisposition, createOptions);
handle = fileHandle;
return status;