RFC: in-memory btree simplifications

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Hi Darrick,

this series has a bunch of simplifications for the xfbtree code I came
up with while reviewing it and trying to understand the logic.

The series is against the djwong-wtf with everything and the kitchen
sink, and will need some heavy rebasing.  As always I'll offer to it
if the changes themselves look good.  I'll probably have a few more
invasive bits in this area when I get further.

Diffstat:
 Documentation/filesystems/xfs-online-fsck-design.rst |    5 
 fs/xfs/libxfs/xfs_bmap.c                             |   27 -
 fs/xfs/libxfs/xfs_bmap_btree.c                       |   14 
 fs/xfs/libxfs/xfs_btree.c                            |   52 +--
 fs/xfs/libxfs/xfs_btree.h                            |   13 
 fs/xfs/libxfs/xfs_btree_mem.h                        |   38 --
 fs/xfs/libxfs/xfs_rmap_btree.c                       |   17 -
 fs/xfs/libxfs/xfs_rmap_btree.h                       |    5 
 fs/xfs/libxfs/xfs_rtrefcount_btree.c                 |   10 
 fs/xfs/libxfs/xfs_rtrmap_btree.c                     |   27 -
 fs/xfs/libxfs/xfs_rtrmap_btree.h                     |    5 
 fs/xfs/scrub/rcbag.c                                 |   47 --
 fs/xfs/scrub/rcbag_btree.c                           |   15 
 fs/xfs/scrub/rcbag_btree.h                           |    5 
 fs/xfs/scrub/rmap_repair.c                           |   55 ---
 fs/xfs/scrub/rtrmap_repair.c                         |   49 ---
 fs/xfs/scrub/trace.h                                 |   13 
 fs/xfs/scrub/xfbtree.c                               |  306 ++-----------------
 fs/xfs/scrub/xfbtree.h                               |   34 --
 19 files changed, 154 insertions(+), 583 deletions(-)




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