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>

3 files changed, 75 insertions, 1 deletions

diff --git a/rpc/xdr/src/cli1-xdr.c b/rpc/xdr/src/cli1-xdr.c
index 250efc93575..9030d3067e7 100644
--- a/rpc/xdr/src/cli1-xdr.c
+++ b/rpc/xdr/src/cli1-xdr.c
@@ -38,6 +38,17 @@ xdr_gf_cli_defrag_type (XDR *xdrs, gf_cli_defrag_type *objp)
 }
 
 bool_t
+xdr_gf_defrag_status_t (XDR *xdrs, gf_defrag_status_t *objp)
+{
+	register int32_t *buf;
+        buf = NULL;
+
+	 if (!xdr_enum (xdrs, (enum_t *) objp))
+		 return FALSE;
+	return TRUE;
+}
+
+bool_t
 xdr_gf1_cluster_type (XDR *xdrs, gf1_cluster_type *objp)
 {
 	register int32_t *buf;
@@ -60,6 +71,17 @@ xdr_gf1_cli_replace_op (XDR *xdrs, gf1_cli_replace_op *objp)
 }
 
 bool_t
+xdr_gf1_op_commands (XDR *xdrs, gf1_op_commands *objp)
+{
+	register int32_t *buf;
+        buf = NULL;
+
+	 if (!xdr_enum (xdrs, (enum_t *) objp))
+		 return FALSE;
+	return TRUE;
+}
+
+bool_t
 xdr_gf_quota_type (XDR *xdrs, gf_quota_type *objp)
 {
 	register int32_t *buf;
diff --git a/rpc/xdr/src/cli1-xdr.h b/rpc/xdr/src/cli1-xdr.h
index 0d606e79ff6..d502c30b491 100644
--- a/rpc/xdr/src/cli1-xdr.h
+++ b/rpc/xdr/src/cli1-xdr.h
@@ -42,9 +42,23 @@ enum gf_cli_defrag_type {
 	GF_DEFRAG_CMD_START_LAYOUT_FIX = 1 + 3,
 	GF_DEFRAG_CMD_START_MIGRATE_DATA = 1 + 4,
 	GF_DEFRAG_CMD_START_MIGRATE_DATA_FORCE = 1 + 5,
+	GF_DEFRAG_CMD_START_FORCE = 1 + 6,
 };
 typedef enum gf_cli_defrag_type gf_cli_defrag_type;
 
+enum gf_defrag_status_t {
+	GF_DEFRAG_STATUS_NOT_STARTED = 0,
+	GF_DEFRAG_STATUS_LAYOUT_FIX_STARTED = 1,
+	GF_DEFRAG_STATUS_MIGRATE_DATA_STARTED = 2,
+	GF_DEFRAG_STATUS_STOPPED = 3,
+	GF_DEFRAG_STATUS_COMPLETE = 4,
+	GF_DEFRAG_STATUS_FAILED = 5,
+	GF_DEFRAG_STATUS_LAYOUT_FIX_COMPLETE = 6,
+	GF_DEFRAG_STATUS_MIGRATE_DATA_COMPLETE = 7,
+	GF_DEFRAG_STATUS_PAUSED = 8,
+};
+typedef enum gf_defrag_status_t gf_defrag_status_t;
+
 enum gf1_cluster_type {
 	GF_CLUSTER_TYPE_NONE = 0,
 	GF_CLUSTER_TYPE_STRIPE = 0 + 1,
@@ -64,6 +78,17 @@ enum gf1_cli_replace_op {
 };
 typedef enum gf1_cli_replace_op gf1_cli_replace_op;
 
+enum gf1_op_commands {
+	GF_OP_CMD_NONE = 0,
+	GF_OP_CMD_START = 0 + 1,
+	GF_OP_CMD_COMMIT = 0 + 2,
+	GF_OP_CMD_PAUSE = 0 + 3,
+	GF_OP_CMD_ABORT = 0 + 4,
+	GF_OP_CMD_STATUS = 0 + 5,
+	GF_OP_CMD_COMMIT_FORCE = 0 + 6,
+};
+typedef enum gf1_op_commands gf1_op_commands;
+
 enum gf_quota_type {
 	GF_QUOTA_OPTION_TYPE_NONE = 0,
 	GF_QUOTA_OPTION_TYPE_ENABLE = 0 + 1,
@@ -593,8 +618,10 @@ typedef struct gf1_cli_umount_rsp gf1_cli_umount_rsp;
 
 #if defined(__STDC__) || defined(__cplusplus)
 extern  bool_t xdr_gf_cli_defrag_type (XDR *, gf_cli_defrag_type*);
+extern  bool_t xdr_gf_defrag_status_t (XDR *, gf_defrag_status_t*);
 extern  bool_t xdr_gf1_cluster_type (XDR *, gf1_cluster_type*);
 extern  bool_t xdr_gf1_cli_replace_op (XDR *, gf1_cli_replace_op*);
+extern  bool_t xdr_gf1_op_commands (XDR *, gf1_op_commands*);
 extern  bool_t xdr_gf_quota_type (XDR *, gf_quota_type*);
 extern  bool_t xdr_gf1_cli_friends_list (XDR *, gf1_cli_friends_list*);
 extern  bool_t xdr_gf1_cli_get_volume (XDR *, gf1_cli_get_volume*);
@@ -663,8 +690,10 @@ extern  bool_t xdr_gf1_cli_umount_rsp (XDR *, gf1_cli_umount_rsp*);
 
 #else /* K&R C */
 extern bool_t xdr_gf_cli_defrag_type ();
+extern bool_t xdr_gf_defrag_status_t ();
 extern bool_t xdr_gf1_cluster_type ();
 extern bool_t xdr_gf1_cli_replace_op ();
+extern bool_t xdr_gf1_op_commands ();
 extern bool_t xdr_gf_quota_type ();
 extern bool_t xdr_gf1_cli_friends_list ();
 extern bool_t xdr_gf1_cli_get_volume ();
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,