Summary: IMM: Failure to send completed to PBE defaulted to ccb-recovery [#1127]
Review request for Trac Ticket(s): 1127
Peer Reviewer(s): Neel
Pull request to: 
Affected branch(es): 4.3: 4.4; 4.5; default(4.6)
Development branch: 

--------------------------------
Impacted area       Impact y/n
--------------------------------
 Docs                    n
 Build system            n
 RPM/packaging           n
 Configuration files     n
 Startup scripts         n
 SAF services            y
 OpenSAF services        n
 Core libraries          n
 Samples                 n
 Tests                   n
 Other                   n


Comments (indicate scope for each "y" above):
---------------------------------------------

changeset 9f43733a20d973b066e87a0a1d3251c6f89afdb9
Author: Anders Bjornerstedt <[email protected]>
Date:   Wed, 24 Sep 2014 13:00:35 +0200

        IMM: Failure to send completed to PBE defaulted to ccb-recovery [#1127]

         The fix is mainly in immnd_evt_proc_ccb_apply, but also some cleanup in
        immnd_evt_proc_ccb_compl_rsp where part of the same problem was 
addressed by
        the earlier ticket: #1096.

        The general case is that the ccb has just gone critical in ImmModel (at 
all
        IMMNDs) and one IMMND is just about to send the completed callback to 
the
        PBE. The completed callback can be sent to PBE either in 
'proc_ccb_apply'
        when there are no regular OIs involved with the ccb; or in
        'proc_ccb_compl_rsp' if there are regular OIs and the reply from all of 
them
        has been received.

        Solution:

        The impossible case of the PBE-OI being known to ImmModel yet the
        client_node not existing is handled by osafassert.

        The rare but possible case of the client_node existing but being stale 
is
        handled by skipping over the send-attempt (which would fail) and letting
        ccb-recovery sort things out.

        The rare but possible case of the client_node being ok but the send 
over MDS
        resulting in an error return from MDS is also handled by letting ccb-
        recovery sort it out. Note that the handling an error code from MDS for 
this
        case as the send having been processed is safer, since the message could
        possibly have reached the PBE despite that MDS reported error.

        The client node stale case could in principle have been handled by 
aborting
        the CCB, but the ImmModel has entered the critical state for this ccb 
at all
        nodes and so such a solution would require a new message type: revert-
        critical-and-abort-ccb being broadcast. Just broadcasting the currenttly
        supported ccb-abort would not work because ccbs in critical will 
(correctly)
        discard such a request.


Complete diffstat:
------------------
 osaf/services/saf/immsv/immnd/immnd_evt.c |  63 
++++++++++++++++++++++++++++++++++++++++++---------------------
 1 files changed, 42 insertions(+), 21 deletions(-)


Testing Commands:
-----------------


Testing, Expected Results:
--------------------------

Conditions of Submission:
-------------------------
Ack from Neel


Arch      Built     Started    Linux distro
-------------------------------------------
mips        n          n
mips64      n          n
x86         n          n
x86_64      n          n
powerpc     n          n
powerpc64   n          n


Reviewer Checklist:
-------------------
[Submitters: make sure that your review doesn't trigger any checkmarks!]


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