Accessing write data within a DMAPI write event?

[jrc@xxxxxxxxxxxxxxxxxx]

Does the DMAPI provide a mechanism to access the about to be written
data from within the event handler for a write event?

I have looked at the XDSM API documentation and the sample DMAPI code 
in the xfstests but didn't find anything suitable.

DMAPI is new to me.  Any suggestions for further reading or example
code would be appreciated.

Thanks in anticipation
--
John Connett