 - Lock access to the buffer_map with the vm_map lock.  In 4.x this was    done with splbio, in 5.x this was done with Giant.
 - Lock access to the buffer_map with the vm_map lock.  In 4.x this was
   done with splbio, in 5.x this was done with Giant.

Discussed with:		alc
Reported by:		julian, pho

jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase