ganesha library: update of export counter and rados object url index object racy

[Ramana Raja]

The ganesha library updates of Ceph RADOS objects, ganesha_rados_export_counter [1] and ganesha_rados_export_index [2], that could be shared by multiple manila driver instances using the ganesha library aren't atomic. For now, this affects multiple instances of CephFS (NFS) driver that are directed at the same NFS-Ganesha over CephFS backend. The fix could will require changes to the ganesha library (in manila) and the ceph_volume_client library (in Ceph).

[1] https://github.com/ajarr/manila/commit/e19ac2e103c8b00455a50c962ff1f1ea57059cf7#diff-ccc750d6512ac97d2a7c2744b0991f1bR538

[2] https://github.com/ajarr/manila/commit/e19ac2e103c8b00455a50c962ff1f1ea57059cf7#diff-ccc750d6512ac97d2a7c2744b0991f1bR416

[Ramana Raja (rraja)]

The ceph_volume_client RFE is here,
https://tracker.ceph.com/issues/24173

[Jason Grosso (jgrosso)]

Ramana any update or milestone that can be set so we can address this issue?

[Vida Haririan (vhariria)]

Additional comments http://eavesdrop.openstack.org/meetings/manila/2020/manila.2020-06-18-15.01.log.html