[Sheepdog] [PATCH v2 0/5] introduce SD_STATUS_HALT to stop serving IO

[Liu Yuan]

This patch set introduce a new cluster status into sheepdog, whichi is supposed
to prevent sheepdog from serving IO when lack of redundant nodes.

Changes from v1 to v2 are:

 - refactor's get_cluster_status() to prepare the code for change.
 - address Kazutaka's comments.
 - make cluster 'halt' optionally.

Liu Yuan (5):
      sheep: refactor get_cluster_status()
      sheep: remove wrong 'unknown message' in the log
      sheep: introduce SD_STATUS_HALT
      sheep: add a helper function to get nr_zones
      sheep: use SD_STATUS_HALT to stop serving IO

 collie/cluster.c         |   14 +++-
 collie/collie.c          |    1 +
 include/sheep.h          |    1 +
 include/sheepdog_proto.h |    1 +
 sheep/group.c            |  209 +++++++++++++++++++++++++++++-----------------
 sheep/sheep_priv.h       |    3 +
 6 files changed, 150 insertions(+), 79 deletions(-)

Thanks,
Yuan