TAKE - XFS I/O path tweaks

[Steve Lord <lord@xxxxxxx>]

cleanup delayed allocate write path a little and fix some
small bugs in there.


Date:  Mon Feb  3 12:10:40 PST 2003
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:138445a
linux/fs/xfs/linux/xfs_aops.c - 1.17
        - Improve documentation, fix the handling of buffer heads on
          the dirty list, and the vnode modified state when converting
          delalloc space to real space. 

linux/fs/xfs/linux/xfs_iomap.c - 1.5
        - Add support for a trylock case in the release page path.