xfs: online repair of AG btrees

This is the first part of the twenty-second revision of a patchset that
adds to XFS kernel support for online metadata scrubbing and repair.
There aren't any on-disk format changes.

New for this version is a rebase against 5.5-rc4, bulk loading of
btrees, integration with the health reporting subsystem, and the
explicit revalidation of all metadata structures that were rebuilt.

First, create a new data structure that provides an abstraction of a big
memory array by using linked lists.  This is where we store records for
btree reconstruction.  This first implementation is memory inefficient
and consumes a /lot/ of kernel memory, but lays the groundwork for a
later patch in the set to convert the implementation to use a (memfd)
swap file, which enables us to use pageable memory without pounding the
slab cache.

The three patches after that implement reconstruction of the free space
btrees, inode btrees, and reference count btree.  The reverse mapping
btree requires considerably more thought and will be covered later.
-----BEGIN PGP SIGNATURE-----
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=ftdZ
-----END PGP SIGNATURE-----