From 6222635b38dd6c8c68cecef3679fa73e96e92411 Mon Sep 17 00:00:00 2001
From: Zdenek Kabelac <zkabelac@redhat.com>
Date: Fri, 21 May 2010 12:55:25 +0000
Subject: [PATCH] Replicator: add find_replicator_vgs

Adding find_replicator_vgs() function to find all needed
VGs for replicator-dev LV.

This function is later called before taking lock_vol().
---
 WHATS_NEW                        |  1 +
 lib/metadata/metadata-exported.h |  2 ++
 lib/metadata/replicator_manip.c  | 32 ++++++++++++++++++++++++++++++++
 3 files changed, 35 insertions(+)

diff --git a/WHATS_NEW b/WHATS_NEW
index d0539c462..0b8d7fb44 100644
--- a/WHATS_NEW
+++ b/WHATS_NEW
@@ -1,5 +1,6 @@
 Version 2.02.67 -
 ===============================
+  Add find_replicator_vgs() to discover all needed VGs for replicator-dev LV.
   Add functions for handling cmd_vg structure.
   Extend _lv_each_dependency() with Replicator dependencies.
   Add check_replicator_segment() for catching internal Replicator errors.
diff --git a/lib/metadata/metadata-exported.h b/lib/metadata/metadata-exported.h
index 37732a58d..5fde3835a 100644
--- a/lib/metadata/metadata-exported.h
+++ b/lib/metadata/metadata-exported.h
@@ -815,6 +815,8 @@ struct cmd_vg *cmd_vg_lookup(struct dm_list *cmd_vgs,
 int cmd_vg_read(struct cmd_context *cmd, struct dm_list *cmd_vgs);
 void cmd_vg_release(struct dm_list *cmd_vgs);
 
+int find_replicator_vgs(struct logical_volume *lv);
+
 struct logical_volume *find_pvmove_lv(struct volume_group *vg,
 				      struct device *dev, uint32_t lv_type);
 struct logical_volume *find_pvmove_lv_from_pvname(struct cmd_context *cmd,
diff --git a/lib/metadata/replicator_manip.c b/lib/metadata/replicator_manip.c
index 9bab6385c..dc14755e2 100644
--- a/lib/metadata/replicator_manip.c
+++ b/lib/metadata/replicator_manip.c
@@ -602,3 +602,35 @@ void cmd_vg_release(struct dm_list *cmd_vgs)
 		cvl->vg = NULL;
 	}
 }
+
+/**
+ * Find all needed remote VGs for processing given LV.
+ * Missing VGs are added to VG's cmd_vg list and flag cmd_missing_vgs is set.
+ */
+int find_replicator_vgs(struct logical_volume *lv)
+{
+	struct replicator_site *rsite;
+	int ret = 1;
+
+	if (!lv_is_replicator_dev(lv))
+		return 1;
+
+	dm_list_iterate_items(rsite, &first_seg(lv)->replicator->rsites) {
+		if (!rsite->vg_name || !lv->vg->cmd_vgs ||
+		    cmd_vg_lookup(lv->vg->cmd_vgs, rsite->vg_name, NULL))
+			continue;
+		ret = 0;
+		/* Using cmd memory pool for cmd_vg list allocation */
+		if (!cmd_vg_add(lv->vg->cmd->mem, lv->vg->cmd_vgs,
+				rsite->vg_name, NULL, 0)) {
+			lv->vg->cmd_missing_vgs = 0; /* do not retry */
+			stack;
+			break;
+		}
+
+		log_debug("VG: %s added as missing.", rsite->vg_name);
+		lv->vg->cmd_missing_vgs++;
+	}
+
+	return ret;
+}