ceph/ceph — pull request #2982 by athanatos (2014-11-22 00:17:33+00:00)
Title: PGLog: allow for empty pg log in update_range if log_tail == eversion_t(...

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Signed-off-by: Samuel Just
(cherry picked from commit 03c5344f74991ec351cdc8a55f6495d496479091)

Fixes: 10168