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Tag:V2.8-dev.6

Release Highlights

* Add liburcu

* Use urcu to manage rados recovery database

* fix invalid assert in mdcache_avl_lookup_ck()

* Remove idmap entry only if it is present in uid_tree

Signed-off-by: Frank S. Filz <ffilzlnx@mindspring.com>

Contents:

25876b6 Frank S. Filz V2.8-dev.6

937170a Trishali Nayar Remove idmap entry only if it is present in uid_tree

7b5dc3f Kinglong Mee MDCACHE: fix invalid assert in mdcache_avl_lookup_ck()

9199855 Jeff Layton rados_recov: convert rados_recov_old_oid to be rcu-managed refstr

9e98a27 Jeff Layton rados_recov: convert rados_recov_oid to be rcu-managed gsh_refstr

9c6e331 Jeff Layton support: add a gsh_refstr type and functions

a99892f Jeff Layton Have threads register and unregister with RCU

1c0c09b Jeff Layton cmake: always build in liburcu