kill xlog_in_core_2_t

[Christoph Hellwig <hch@lst.de>]

Hi all,

xlog_in_core_2_t is probably one of the most confusing types in the
kernel. Not only does it describe an on-disk format despite claiming
to be in-core in the name, but it is also has an extremely confusing
layout.  This series revamps our C representation of the underlying
data structures so that they hopefully make a lot more sense while
killing off xlog_in_core_2_t for good.

Diffstat:
 libxfs/xfs_log_format.h |   38 +++++-----
 libxfs/xfs_ondisk.h     |    6 +
 xfs_log.c               |  181 +++++++++++++++++-------------------------------
 xfs_log_cil.c           |    6 -
 xfs_log_priv.h          |   27 +++++--
 xfs_log_recover.c       |   45 ++++-------
 xfs_trace.h             |    2 
 7 files changed, 131 insertions(+), 174 deletions(-)