ceph-for-5.6-rc1

We have:

- a set of patches that fixes various corner cases in mount and umount
  code (Xiubo Li).  This has to do with choosing an MDS, distinguishing
  between laggy and down MDSes and parsing the server path.

- inode initialization fixes (Jeff Layton).  The one included here
  mostly concerns things like open_by_handle() and there is another
  one that will come through Al.

- copy_file_range() now uses the new copy-from2 op (Luis Henriques).
  The existing copy-from op turned out to be infeasible for generic
  filesystem use; we disable the copy offload if OSDs don't support
  copy-from2.

- a patch to link "rbd" and "block" devices together in sysfs (Hannes
  Reinecke)

And a smattering of cleanups from Xiubo, Jeff and Chengguang.
-----BEGIN PGP SIGNATURE-----

iQFHBAABCAAxFiEEydHwtzie9C7TfviiSn/eOAIR84sFAl47PUcTHGlkcnlvbW92
QGdtYWlsLmNvbQAKCRBKf944AhHzi6LoCACmVli5N6bgnBE4sTixi/jz6aCCbk32
ZPlKiSesHnOGkY6KXHJT58JYy0paITBRik5ypdz06J8aCOtWyPLbn3uCemF9CYn2
g6dId2Lf5vGFrgSm4YSiqp9a86IZmYSDG41LbJD/IJWFDWdMWqNPMDqji6yaIO5O
NJI5N0tk+VFXdV+JyjV9X/FnP1r1D2ReZzz21ZiqTJXSmE8YIkioLjkq36QTMMG7
Gm5qdlc1x2r4qfzA1g+OiWgRQCUMgkuYerFzus4mVbW4hrphsavH2DArbOwFmsXF
46hOq+1uGVVyZILLJfKNiktf1GExBF0icbSREJtmjUHbQvNR8BH0C+fV
=vvIc
-----END PGP SIGNATURE-----