Branch next 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