PARTIAL TAKE 904615 - Use buffer head flag set/clear routines

[Eric Sandeen <sandeen@xxxxxxxxxxxxxxxxxxxxxxxx>]

Use buffer head flag set/clear routines as in 2.6
kernel to reduce 2.4/2.6 differences in xfs

Date:  Thu Nov 13 14:40:38 PST 2003
Workarea:  penguin.americas.sgi.com:/src/eric/xfs-trees/xfs-kern-reconcile

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


Modid:  xfs-linux:slinx:161777a
pagebuf/page_buf.c - 1.139
        - Define buffer head flag set/clear routines as in 2.6

pagebuf/page_buf.h - 1.72
        - use set_buffer_FOO and clear_buffer_FOO macros

linux/xfs_linux.h - 1.116
        - emit BH_Unwritten flag handling macros

linux/xfs_aops.c - 1.55
        - use set_buffer_FOO and clear_buffer_FOO macros