TAKE - turn off concat_ok in cases of LVM device.

[Russell Cattelan <cattelan@xxxxxxxxxxxxxxxx>]

Date:  Wed Sep 13 11:23:07 PDT 2000
Workarea:  gibble.americas.sgi.com:/export/extra/x2.4-xfs

The following file(s) were checked into:
  bonnie.engr.sgi.com:/isms/slinx/2.4.0-test1-xfs


Modid:  2.4.0-test1-xfs:slinx:74318a
linux/fs/pagebuf/page_buf.c - 1.32
        - Turn off buffer head concatination in the case of and LVM device.
          it appears lvm wasn't doing the right things in case of differing 
request sizes.
          This should be fixed in later version but for now this appears to 
allow striped 
          devices to work correctly.