merge from geom_vol_ffs.c rev 1.14 (avoid unaligned I/O requests)
merge from geom_vol_ffs.c rev 1.14 (avoid unaligned I/O requests)

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