From e0a86d8c1896ecefcbfb884e9857a0b958bef703 Mon Sep 17 00:00:00 2001
From: Alasdair Kergon <agk@redhat.com>
Date: Wed, 12 May 2004 20:43:34 +0000
Subject: [PATCH] Ensure presence of virtual targets before attempting
 activation.

---
 WHATS_NEW                  |  2 ++
 lib/activate/dev_manager.c | 17 ++++++++++++++++-
 2 files changed, 18 insertions(+), 1 deletion(-)

diff --git a/WHATS_NEW b/WHATS_NEW
index 4776c6460..e3b32e74e 100644
--- a/WHATS_NEW
+++ b/WHATS_NEW
@@ -1,5 +1,7 @@
 Version 2.00.16 - 
 =============================
+  Ensure presence of virtual targets before attempting activating.
+  Attempt to fix resizing of snapshot origins.
   Restructure lvresize, bringing it closer to lvcreate.
   A quick sanity check on vg_disk struct when read in.  More checks needed.
   Only include visible LVs in active/open counts.
diff --git a/lib/activate/dev_manager.c b/lib/activate/dev_manager.c
index bb022ab92..778fe5ab9 100644
--- a/lib/activate/dev_manager.c
+++ b/lib/activate/dev_manager.c
@@ -2048,8 +2048,9 @@ static int _remove_suspended_lvs(struct dev_manager *dm,
 static int _targets_present(struct dev_manager *dm, struct list *lvs)
 {
 	struct logical_volume *lv;
-	struct list *lvh;
+	struct list *lvh, *segh;
 	struct segment_type *segtype;
+	struct lv_segment *seg;
 	int snapshots = 0, mirrors = 0;
 
 	list_iterate(lvh, lvs) {
@@ -2062,6 +2063,20 @@ static int _targets_present(struct dev_manager *dm, struct list *lvs)
 		if (!mirrors)
 			if (lv->status & PVMOVE)
 				mirrors = 1;
+
+		if (lv->status & VIRTUAL) {
+			list_iterate(segh, &lv->segments) {
+				seg = list_item(segh, struct lv_segment);
+				if (seg->segtype->ops->target_present &&
+		    		    !seg->segtype->ops->target_present()) {
+					log_error("Can't expand LV: %s target "
+						  "support missing "
+				  	  	  "from kernel?",
+						  seg->segtype->name);
+					return 0;
+				}
+			}
+		}
 	}
 
 	if (mirrors) {