New stuff for 5.3:

- Refactor inode geometry calculation into a single structure instead of
  open-coding pieces everywhere.
- Add online repair to build options.
- Remove unnecessary function call flags and functions.
- Claim maintainership of various loose xfs documentation and header
  files.
- Use struct bio directly for log buffer IOs instead of struct xfs_buf.
- Reduce log item boilerplate code requirements.
- Merge log item code spread across too many files.
- Further distinguish between log item commits and cancellations.
- Various small cleanups to the ag small allocator.
- Support cgroup-aware writeback
- libxfs refactoring for mkfs cleanup
- Remove unneeded #includes
- Fix a memory allocation miscalculation in the new log bio code
- Fix bisection problems
- Fix a crash in ioend processing caused by tripping over freeing of
  preallocated transactions
- Split out a generic inode walk mechanism from the bulkstat code, hook
  up all the internal users to use the walking code, then clean up
  bulkstat to serve only the bulkstat ioctls.
- Add a multithreaded iwalk implementation to speed up quotacheck on
  fast storage with many CPUs.
- Remove unnecessary return values in logging teardown functions.
- Supplement the bstat and inogrp structures with new bulkstat and
  inumbers structures that have all the fields we need for v5
  filesystem features and none of the padding problems of their
  predecessors.
- Wire up new ioctls that use the new structures with a much simpler
  bulk_ireq structure at the head instead of the pointerhappy mess we
  had before.
- Enable userspace to constrain bulkstat returns to a single AG or a
  single special inode so that we can phase out a lot of geometry
  guesswork in userspace.
- Reduce memory consumption and zeroing overhead in extended attribute
  scrub code.
- Fix some behavioral regressions in the new bulkstat backend code.
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