[LU-795] per-transaction commit callbacks (ORI-107 port)

• Type: Bug
• Resolution: Fixed
• Priority: Minor
• Fix Version/s: Lustre 2.2.0
• Assignee: Mikhail Pershin
• Reporter: Mikhail Pershin

Description

Port from orion branch to fix issue with synchronous SEQ update found by mds_survey runs.

• ability to add commit callback per transaction in addition to per-device
  hooks. Now it is much simpler if only commit callback is needed.
• rewrite commit callbacks for last_commit and new_client, add commit callback
  in seq manager
• cleanup not-needed code: old commit callbacks, txn_keys
• remove osd od_env_for_commit environment and env param from commit callbacks

Issue Links

• Trackbacks: Changelog 2.2 version 2.2.0 Support for networks: o2iblnd OFED 1.5.4 Server support for kernels: 2.6.32220.4.2.el6 (RHEL6) Client support for unpatched kernels: 2.6.18274.18.1.el5 (RHEL5) 2.6.32220.4.2.el6 (RHEL6) 2.6.32.360....