XFS changes for 4.21:

- Fix CoW remapping of extremely fragmented file areas
- Fix a zero-length symlink verifier error
- Constify some of the rmap owner structures for per-AG metadata
- Precalculate inode geometry for later use
- Fix scrub counting problems
- Don't crash when rtsummary inode is null
- Fix x32 ioctl operation
- Fix enum->string mappings for ftrace output
-----BEGIN PGP SIGNATURE-----
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=WGqj
-----END PGP SIGNATURE-----