quorum devices: add support to build system

Signed-off-by: Fabio M. Di Nitto <fdinitto@redhat.com>
Reviewed-by: Christine Caulfield <ccaulfie@redhat.com>
Reviewed-by: Jan Friesse <jfriesse@redhat.com>
votequorum: re-enable qdevice api

Signed-off-by: Fabio M. Di Nitto <fdinitto@redhat.com>
Reviewed-by: Christine Caulfield <ccaulfie@redhat.com>
Reviewed-by: Jan Friesse <jfriesse@redhat.com>
votequorum: rename NODE_FLAGS_QDEVICE to NODE_FLAGS_QDEVICE_REGISTERED

make the flag name explicit

Signed-off-by: Fabio M. Di Nitto <fdinitto@redhat.com>
Reviewed-by: Christine Caulfield <ccaulfie@redhat.com>
Reviewed-by: Jan Friesse <jfriesse@redhat.com>
votequorum: rename NODE_FLAGS_QDEVICE_STATE to NODE_FLAGS_QDEVICE_ALIVE

STATE is confusing and overloaded term in votequorum as it's used for nodes
and other bits.

make the name unique and ALIVE means that the qdevice is heartbeating
to votequorum.

improve display of the status in tools and tests.

Signed-off-by: Fabio M. Di Nitto <fdinitto@redhat.com>
Reviewed-by: Christine Caulfield <ccaulfie@redhat.com>
Reviewed-by: Jan Friesse <jfriesse@redhat.com>
votequorum: add qdevice CAST_VOTE status/flag

this is a preparation commit for the next changes. right now it is
no more than an alias to ALIVE.

CAST_VOTE is required to support master/slave feature from qdevice.

Effectively a quorum device can be:

Not registered / registered (connected to API but nothing else is happening)

if registered:

Not alive / alive (quorum device is petting the API via poll and timer is running)

if alive:

Not voting (slave) / voting (master)

Signed-off-by: Fabio M. Di Nitto <fdinitto@redhat.com>
Reviewed-by: Christine Caulfield <ccaulfie@redhat.com>
Reviewed-by: Jan Friesse <jfriesse@redhat.com>
votequorum: simply internal qdevice_getinfo function

as data are moving around we can drop lots of special cases

Signed-off-by: Fabio M. Di Nitto <fdinitto@redhat.com>
Reviewed-by: Christine Caulfield <ccaulfie@redhat.com>
Reviewed-by: Jan Friesse <jfriesse@redhat.com>
votequorum: use REGISTERED flag consistently

Signed-off-by: Fabio M. Di Nitto <fdinitto@redhat.com>
Reviewed-by: Christine Caulfield <ccaulfie@redhat.com>
Reviewed-by: Jan Friesse <jfriesse@redhat.com>
votequorum: simplify getinfo data and protect against call against quorum node

Signed-off-by: Fabio M. Di Nitto <fdinitto@redhat.com>
Reviewed-by: Christine Caulfield <ccaulfie@redhat.com>
Reviewed-by: Jan Friesse <jfriesse@redhat.com>
votequorum: move to the new flag structure

simplify different code path as checks are simpler, separate
ALIVE and CAST_VOTE

Signed-off-by: Fabio M. Di Nitto <fdinitto@redhat.com>
Reviewed-by: Christine Caulfield <ccaulfie@redhat.com>
Reviewed-by: Jan Friesse <jfriesse@redhat.com>
votequorum: several major bug fixes and code cleanup

- add a protection check to avoid spurious messages on membership
  change
- greately simplify processing of nodeinfo, since the only
  data that we send for qdevice over nodeinfo is the number of votes
- fix a flag check to trigger quorum calculation that would
  leave a cluster unquorate under certain conditions

Signed-off-by: Fabio M. Di Nitto <fdinitto@redhat.com>
Reviewed-by: Christine Caulfield <ccaulfie@redhat.com>
Reviewed-by: Jan Friesse <jfriesse@redhat.com>
votequorum: remove last instance of state and rename it to cast_vote

also align naming of vote to cast_vote for info calls

Signed-off-by: Fabio M. Di Nitto <fdinitto@redhat.com>
Reviewed-by: Christine Caulfield <ccaulfie@redhat.com>
Reviewed-by: Jan Friesse <jfriesse@redhat.com>
votequorum: fix flag check for qdevice votes propagation

and cleanup similar code to make it more readable

Signed-off-by: Fabio M. Di Nitto <fdinitto@redhat.com>
Reviewed-by: Christine Caulfield <ccaulfie@redhat.com>
Reviewed-by: Jan Friesse <jfriesse@redhat.com>
qdevice: implement master_wins partition

in previous incarnation of qdisk + cman, master_wins was restricted
to 2 node only.

In this new version it is possible to use master_wins for any cluster
size.

Let's assume a 4 node cluster. Each node votes 1, qdevice votes 3.

node 1 becomes qdevice master
node 2/3/4 no

In case of a split (let's assume 2/2):

partition 1: {4, 1}
partition 2: {1, 1}

node 2 in partition 1 would normally be unquorate, leaving effectively
only node 1 active.

master_wins allows node 2 to recognize to be part of a quorate partition
(since node1 is broadcasting that qdevice is voting) and retain
quorum.

node1 has never lost quorate status since qdevice is voting there.

Signed-off-by: Fabio M. Di Nitto <fdinitto@redhat.com>
Reviewed-by: Christine Caulfield <ccaulfie@redhat.com>
Reviewed-by: Jan Friesse <jfriesse@redhat.com>
votequorum: fix define name to match reality

Signed-off-by: Fabio M. Di Nitto <fdinitto@redhat.com>
Reviewed-by: Christine Caulfield <ccaulfie@redhat.com>
Reviewed-by: Jan Friesse <jfriesse@redhat.com>
votequorum: drop _FLAG_ from defines

those are all info flags.. it's redudant and inconsistent

Signed-off-by: Fabio M. Di Nitto <fdinitto@redhat.com>
Reviewed-by: Christine Caulfield <ccaulfie@redhat.com>
Reviewed-by: Jan Friesse <jfriesse@redhat.com>
votequorum: external defines should all be prefixed with VOTEQUORUM_

Signed-off-by: Fabio M. Di Nitto <fdinitto@redhat.com>
Reviewed-by: Christine Caulfield <ccaulfie@redhat.com>
Reviewed-by: Jan Friesse <jfriesse@redhat.com>
votequorum: drop votequorum_qdevice_getinfo and collapse data into getinfo

it's really pointless to have basically a duplicated API call
to transfer one value and one name.

Signed-off-by: Fabio M. Di Nitto <fdinitto@redhat.com>
Reviewed-by: Christine Caulfield <ccaulfie@redhat.com>
Reviewed-by: Jan Friesse <jfriesse@redhat.com>
votequorum: delegate qdevice_master_wins setting to qdevice

votequorum has no business to device if master_wins setting is correct or not.
only the qdevice can decide and should set the value for votequorum.

Logic is:

- user requests master_wins from config
- corosync starts
- qdevice starts
- qdevice reads cmap values / register with votequorum
- qdevice decides if the node can support master_wins or not and tells votequorum
- at this point votequorum can check if an unquorate node is part of the master_wins
  partition

it is the qdevice responsibility to keep that value up to date in votequorum and the
value can be changed at runtime.

this commit also exchange per node master_wins information to lay down the infrastructure
to verify discrepancies in node config for master_wins (coming next on this channel).

Signed-off-by: Fabio M. Di Nitto <fdinitto@redhat.com>
Reviewed-by: Christine Caulfield <ccaulfie@redhat.com>
Reviewed-by: Jan Friesse <jfriesse@redhat.com>
votequorum: fix library checks on qdevice name and readd qdevice_update

for some odd reasons qdevice_update was just gone.. totally...

Signed-off-by: Fabio M. Di Nitto <fdinitto@redhat.com>
Reviewed-by: Christine Caulfield <ccaulfie@redhat.com>
Reviewed-by: Jan Friesse <jfriesse@redhat.com>
votequorum: add ENTER/LEAVE for consistency

Signed-off-by: Fabio M. Di Nitto <fdinitto@redhat.com>
Reviewed-by: Christine Caulfield <ccaulfie@redhat.com>
Reviewed-by: Jan Friesse <jfriesse@redhat.com>