[Cluster-devel] [RFC PATCH dlm/next 00/16] fs: dlm: introduce dlm retransmission layer

[Alexander Aring <aahringo@redhat.com>]

Hi,

this is the final patch-series to make dlm reliable when reconnection
occurs. You can easily generate a couple of reconnections by running:

tcpkill -9 -i $IFACE port 21064

on your own to test these patches. At some time dlm will detect message
drops and will retransmit messages if necessary. It introduces a new dlm
protocol behaviour and increases the dlm protocol version. I tested it
with SCTP as well and tried to be backwardscompatible with dlm protocol
version 3.1. However I don't recommend at all to not mix these versions
in a setup since dlm version 3.2 fixes long-term issues.

- Alex

Alexander Aring (16):
  fs: dlm: add errno handling to check callback
  fs: dlm: add check if dlm is currently running
  fs: dlm: add check for minimum allocation length
  fs: dlm: public utils header utils
  fs: dlm: use GFP_ZERO for page buffer
  fs: dlm: simplify writequeue handling
  fs: dlm: add more midcomms hooks
  fs: dlm: make buffer handling per msg
  fs: dlm: make new buffer handling softirq ready
  fs: dlm: add functionality to retransmit a message
  fs: dlm: move out some hash functionality
  fs: dlm: remove unaligned memory access handling
  fs: dlm: check on minimum header size
  fs: dlm: add union in dlm header for lockspace id
  fs: dlm: add reliable connection if reconnect
  fs: dlm: don't allow half transmitted messages

 fs/dlm/config.c       |   60 ++-
 fs/dlm/dlm_internal.h |   32 +-
 fs/dlm/lock.c         |   16 +-
 fs/dlm/lockspace.c    |    5 +-
 fs/dlm/lowcomms.c     |  273 +++++++---
 fs/dlm/lowcomms.h     |   25 +-
 fs/dlm/member.c       |   16 +
 fs/dlm/member.h       |    1 +
 fs/dlm/midcomms.c     | 1094 +++++++++++++++++++++++++++++++++++++++--
 fs/dlm/midcomms.h     |   10 +
 fs/dlm/rcom.c         |   61 ++-
 fs/dlm/recoverd.c     |    4 +
 fs/dlm/util.c         |   10 +-
 fs/dlm/util.h         |    2 +
 14 files changed, 1438 insertions(+), 171 deletions(-)

-- 
2.26.2