2.1.2.3 REPARSE_GUID_DATA_BUFFER

The REPARSE_GUID_DATA_BUFFER data element stores data for a reparse point and associates a GUID with the reparse tag. This reparse data buffer MUST be used only with reparse tag values whose high bit is set to 0.

Reparse point GUIDs are assigned by the independent software vendor (ISV). An ISV MUST link one GUID to each assigned reparse point tag and MUST always use that GUID with that tag.

0	1	2	3	4	5	6	7	8	9	1 0	1	2	3	4	5	6	7	8	9	2 0	1	2	3	4	5	6	7	8	9	3 0	1
ReparseTag
ReparseDataLength																Reserved
ReparseGuid (16 bytes)
...
...
DataBuffer (variable)
...

ReparseTag (4 bytes): A 32-bit unsigned integer value containing the reparse point tag that uniquely identifies the owner of the reparse point.

ReparseDataLength (2 bytes): A 16-bit unsigned integer value containing the size, in bytes, of the reparse data in the DataBuffer member.

Reserved (2 bytes): A 16-bit field. This field SHOULD be set to 0 by the client, and MUST be ignored by the server.

ReparseGuid (16 bytes): A 16-byte GUID that uniquely identifies the owner of the reparse point. Reparse point GUIDs are not assigned by Microsoft. A reparse point implementer MUST select one GUID to be used with their assigned reparse point tag to uniquely identify that reparse point. For more information, see [REPARSE].

DataBuffer (variable): The content of this buffer is opaque to the file system. On receipt, its content MUST be preserved and properly returned to the caller.