CIFS Open Action Encoding
In a server response to a client open or create request, the server encodes the action taken in a 16-bit open action field.
The open action field has the following bit format:
1111 11 5432 1098 7654 3210 Lrrr rrrr rrrr rrOO
L
Value Description 0 File opened by another or mode not supported. 1 File opened only by this user at the present time. r
Reserved. Must be 0 (zero).O
Existence of the file.Value Description 0 The file existed and was opened 1 The file did not exist and was created. 2 The file existed and was truncated.