bring back RT delalloc support v3

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Hi all,

this series adds back delalloc support for RT inodes, at least if the RT
extent size is a single file system block.  This shows really nice
performance improvements for workloads that frequently rewrite or append
to files, and improves fragmentation for larger writes.  On other
workloads it sometimes shows small performance improvements or flat
performance.

Changes since v3:
 - drop gratuitous changes to xfs_mod_freecounter/xfs_add_freecounter
   that caused a warning to be logged when it shouldn't.
 - track delalloc rtextents instead of rtblocks in xfs_mount
 - fix commit message spelling an typos
 
Changes since v2:
 - keep casting to int64_t for xfs_mod_delalloc
 - add a patch to clarify and assert that the block delta in
   xfs_trans_unreserve_and_mod_sb can only be positive

Diffstat:
 libxfs/xfs_ag.c       |    4 -
 libxfs/xfs_ag_resv.c  |   24 ++---------
 libxfs/xfs_ag_resv.h  |    2 
 libxfs/xfs_alloc.c    |    4 -
 libxfs/xfs_bmap.c     |  102 ++++++++++++++++++++++++++++++--------------------
 libxfs/xfs_rtbitmap.c |   14 ++++++
 libxfs/xfs_shared.h   |    6 +-
 scrub/fscounters.c    |    4 +
 scrub/repair.c        |    5 --
 xfs_fsops.c           |   29 +++-----------
 xfs_fsops.h           |    2 
 xfs_inode.c           |    3 -
 xfs_iomap.c           |   44 ++++++++++++++-------
 xfs_iops.c            |    2 
 xfs_mount.c           |   74 +++++++++++++++++++-----------------
 xfs_mount.h           |   41 ++++++++++++++++----
 xfs_rtalloc.c         |    2 
 xfs_super.c           |   17 +++++---
 xfs_trace.h           |    1 
 xfs_trans.c           |   63 ++++++++++++++++--------------
 20 files changed, 255 insertions(+), 188 deletions(-)




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