support for de-commissioning a node using 'remove-brick'

to achieve this, we now create volume-file with
'decommissioned-nodes' option in distribute volume, then just
perform the rebalance set of operations (with 'force' flag set).

now onwards, the 'remove-brick' (with 'start' option) operation tries
to migrate data from removed bricks to existing bricks.

'remove-brick' also supports similar options as of replace-brick.

* (no options) -> works as 'force', will have the current behavior
         of remove-brick, ie., no data-migration, volume changes.

* start  (starts remove-brick with data-migration/draining process,
          which takes care of migrating data and once complete, will
          commit the changes to volume file)
* pause  (stop data migration, but keep the volume file intact with
          extra options whatever is set)
* abort  (stop data-migration, and fall back to old configuration)
* commit (if volume is stopped, commits the changes to volumefile)
* force  (stops the data-migration and commits the changes to
          volume file)

Change-Id: I3952bcfbe604a0952e68b6accace7014d5e401d3
BUG: 1952
Reviewed-on: http://review.gluster.com/118
Tested-by: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Vijay Bellur <vijay@gluster.com>

1 files changed, 24 insertions, 1 deletions

diff --git a/rpc/xdr/src/cli1-xdr.x b/rpc/xdr/src/cli1-xdr.x
index 9fc9f02d29d..ff2f09af3f6 100644
--- a/rpc/xdr/src/cli1-xdr.x
+++ b/rpc/xdr/src/cli1-xdr.x
@@ -4,7 +4,20 @@
         GF_DEFRAG_CMD_STATUS,
         GF_DEFRAG_CMD_START_LAYOUT_FIX,
         GF_DEFRAG_CMD_START_MIGRATE_DATA,
-        GF_DEFRAG_CMD_START_MIGRATE_DATA_FORCE
+        GF_DEFRAG_CMD_START_MIGRATE_DATA_FORCE,
+        GF_DEFRAG_CMD_START_FORCE /* used by remove-brick data migration */
+} ;
+
+ enum gf_defrag_status_t {
+        GF_DEFRAG_STATUS_NOT_STARTED,
+        GF_DEFRAG_STATUS_LAYOUT_FIX_STARTED,
+        GF_DEFRAG_STATUS_MIGRATE_DATA_STARTED,
+        GF_DEFRAG_STATUS_STOPPED,
+        GF_DEFRAG_STATUS_COMPLETE,
+        GF_DEFRAG_STATUS_FAILED,
+        GF_DEFRAG_STATUS_LAYOUT_FIX_COMPLETE,
+        GF_DEFRAG_STATUS_MIGRATE_DATA_COMPLETE,
+        GF_DEFRAG_STATUS_PAUSED
 } ;
 
  enum gf1_cluster_type {
@@ -24,6 +37,16 @@
         GF_REPLACE_OP_COMMIT_FORCE
 } ;
 
+ enum gf1_op_commands {
+        GF_OP_CMD_NONE = 0,
+        GF_OP_CMD_START,
+        GF_OP_CMD_COMMIT,
+        GF_OP_CMD_PAUSE,
+        GF_OP_CMD_ABORT,
+        GF_OP_CMD_STATUS,
+        GF_OP_CMD_COMMIT_FORCE
+} ;
+
 enum gf_quota_type {
         GF_QUOTA_OPTION_TYPE_NONE = 0,
         GF_QUOTA_OPTION_TYPE_ENABLE,