cli/glusterd: add/remove brick fixes for arbiter volumes

Backport of: http://review.gluster.org/14126

1.Provide a command to convert replica 2 volumes to arbiter volumes.
Existing self-heal logic will automatically heal the file hierarchy into
the arbiter brick, the progress of which can be monitored using the
heal info command.

Syntax: gluster volume add-brick <VOLNAME> replica 3 arbiter 1
<HOST:arbiter-brick-path>

2. Add checks when removing bricks from arbiter volumes:
- When converting from arbiter to replica 2 volume, allow only arbiter
  brick to be removed.
- When converting from arbiter to plain distribute volume, allow only if
  arbiter is one of the bricks that is removed.

3. Some clean-up:
- Use GD_MSG_DICT_GET_SUCCESS instead of GD_MSG_DICT_GET_FAILED to
log messages that are not failures.
- Remove unused variable `brick_list`
- Move 'brickinfo->group' related functions to glusted-utils.

Change-Id: Ifa75d137c67ffddde7dcb8e0df0873163e713119
BUG: 1337387
Signed-off-by: Ravishankar N <ravishankar@redhat.com>
Reviewed-on: http://review.gluster.org/14502
Smoke: Gluster Build System <jenkins@build.gluster.com>
NetBSD-regression: NetBSD Build System <jenkins@build.gluster.org>
CentOS-regression: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Atin Mukherjee <amukherj@redhat.com>

1 files changed, 6 insertions, 0 deletions

diff --git a/xlators/mgmt/glusterd/src/glusterd-utils.h b/xlators/mgmt/glusterd/src/glusterd-utils.h
index e6436eff419..5f4bb6d251b 100644
--- a/xlators/mgmt/glusterd/src/glusterd-utils.h
+++ b/xlators/mgmt/glusterd/src/glusterd-utils.h
@@ -708,4 +708,10 @@ int
 glusterd_handle_replicate_brick_ops (glusterd_volinfo_t *volinfo,
                                      glusterd_brickinfo_t *brickinfo,
                                      glusterd_op_t op);
+void
+assign_brick_groups (glusterd_volinfo_t *volinfo);
+
+glusterd_brickinfo_t*
+get_last_brick_of_brick_group (glusterd_volinfo_t *volinfo,
+                               glusterd_brickinfo_t *brickinfo);
 #endif