Merge tag 'ceph-for-4.9-rc2' of git://github.com/ceph/ceph-client

Pull Ceph fixes from Ilya Dryomov:
 "An rbd exclusive-lock edge case fix and several filesystem fixups.

  Nikolay's error path patch is tagged for stable, everything else but
  readdir vs frags race was introduced in this merge window"

* tag 'ceph-for-4.9-rc2' of git://github.com/ceph/ceph-client:
  ceph: fix non static symbol warning
  ceph: fix uninitialized dentry pointer in ceph_real_mount()
  ceph: fix readdir vs fragmentation race
  ceph: fix error handling in ceph_read_iter
  rbd: don't retry watch reregistration if header object is gone
  rbd: don't wait for the lock forever if blacklisted