From 876003dc44d92661773b1175768dd892b6d8bf87 Mon Sep 17 00:00:00 2001
From: Alasdair Kergon <agk@redhat.com>
Date: Wed, 16 Jan 2008 19:18:51 +0000
Subject: [PATCH] allow a mirror to contain only one mimage

---
 lib/activate/activate.c | 7 +++++++
 lib/metadata/mirror.c   | 2 +-
 lib/mirror/mirrored.c   | 5 +++++
 3 files changed, 13 insertions(+), 1 deletion(-)

diff --git a/lib/activate/activate.c b/lib/activate/activate.c
index 30fdaa475..785d3bb22 100644
--- a/lib/activate/activate.c
+++ b/lib/activate/activate.c
@@ -508,6 +508,13 @@ int lv_mirror_percent(struct cmd_context *cmd, struct logical_volume *lv,
 	struct dev_manager *dm;
 	struct lvinfo info;
 
+	/* If mirrored LV is temporarily shrinked to 1 area (= linear),
+	 * it should be considered in-sync. */
+	if (list_size(&lv->segments) == 1 && first_seg(lv)->area_count == 1) {
+		*percent = 100.0;
+		return 1;
+	}
+
 	if (!activation())
 		return 0;
 
diff --git a/lib/metadata/mirror.c b/lib/metadata/mirror.c
index be9e7ae78..21e00b945 100644
--- a/lib/metadata/mirror.c
+++ b/lib/metadata/mirror.c
@@ -956,7 +956,7 @@ float copy_percent(struct logical_volume *lv_mirr)
 	list_iterate_items(seg, &lv_mirr->segments) {
 		denominator += seg->area_len;
 
-		if (seg_is_mirrored(seg))
+		if (seg_is_mirrored(seg) && seg->area_count > 1)
 			numerator += seg->extents_copied;
 		else
 			numerator += seg->area_len;
diff --git a/lib/mirror/mirrored.c b/lib/mirror/mirrored.c
index 3a3df3316..917d0391a 100644
--- a/lib/mirror/mirrored.c
+++ b/lib/mirror/mirrored.c
@@ -283,6 +283,11 @@ static int _mirrored_add_target_line(struct dev_manager *dm, struct dm_pool *mem
 
 	mirr_state = *target_state;
 
+	/* Mirror segment could have only 1 area temporarily,
+	 * if the segment is under conversion. */
+ 	if (seg->area_count == 1)
+		mirror_status = MIRR_DISABLED;
+
 	/*
 	 * For pvmove, only have one mirror segment RUNNING at once.
 	 * Segments before this are COMPLETED and use 2nd area.