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TAKE - optimize xfs bitmap operations

Speed up the bitmap operations and use more core
linux functionality. Andi Kleen again.

Steve

Date:  Fri May 24 07:39:39 PDT 2002
Workarea:  jen.americas.sgi.com:/src/lord/xfs-linux.2.4

The following file(s) were checked into:
  bonnie.engr.sgi.com:/isms/slinx/2.4.x-xfs


Modid:  2.4.x-xfs:slinx:120155a
linux/fs/xfs/xfs_buf_item.c - 1.118
linux/fs/xfs/xfs_bit.h - 1.8
linux/fs/xfs/xfs_bit.c - 1.14
linux/fs/xfs/xfs_log_recover.c - 1.228
linux/fs/xfs/xfs_rtbit.c - 1.8