Background poll for lvconvert -M command.
The merging snapshot is removed when the merge finishes.

Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>

---
 tools/lvconvert.c |   54 ++++++++++++++++++++++++++++++++++++++++++++++++++++--
 1 file changed, 52 insertions(+), 2 deletions(-)

Index: LVM2.2.02.39/tools/lvconvert.c
===================================================================
--- LVM2.2.02.39.orig/tools/lvconvert.c	2008-07-06 21:56:21.000000000 +0200
+++ LVM2.2.02.39/tools/lvconvert.c	2008-07-06 21:56:24.000000000 +0200
@@ -326,6 +326,42 @@ static int _finish_lvconvert_mirror(stru
 	return 1;
 }
 
+static int _finish_lvconvert_merge(struct cmd_context *cmd,
+				   struct volume_group *vg,
+				   struct logical_volume *lv,
+				   struct list *lvs_changed __attribute((unused)))
+{
+	struct lv_segment *snap_seg = lv->merging_snapshot;
+	if (!snap_seg) {
+		log_error("Logical volume %s has no merging snapshot.", lv->name);
+		return 0;
+	}
+
+	log_print("Merge into logical volume %s finished.", lv->name);
+	if (!lv_remove_single(cmd, snap_seg->cow, DONT_PROMPT)) {
+		log_error("Could not remove snapshot %s merged into %s.", snap_seg->cow->name, lv->name);
+		return 0;
+	}
+
+	return 1;
+}
+
+static int _poll_merge_progress(struct cmd_context *cmd,
+ 				struct volume_group *vg,
+				struct logical_volume *lv,
+				struct daemon_parms *parms)
+{
+	float percent;
+	if (!lv_snapshot_percent(lv, &percent)) {
+		log_error("Failed to query for merging percentage of lv %s.", lv->name);
+		return PROGRESS_FINISHED;
+	}
+	printf("progress... %f\n", percent);
+/* !!! FIXME: don't use floating point math ; audit the whole lvm for it */
+	if (!percent) return PROGRESS_FINISHED;
+	return PROGRESS_TRY_AGAIN;
+}
+
 static struct poll_functions _lvconvert_mirror_fns = {
 	.get_copy_vg = _get_lvconvert_vg,
 	.get_copy_lv = _get_lvconvert_lv,
@@ -334,6 +370,13 @@ static struct poll_functions _lvconvert_
 	.finish_copy = _finish_lvconvert_mirror,
 };
 
+static struct poll_functions _lvconvert_merge_fns = {
+	.get_copy_vg = _get_lvconvert_vg,
+	.get_copy_lv = _get_lvconvert_lv,
+	.poll_progress = _poll_merge_progress,
+	.finish_copy = _finish_lvconvert_merge,
+};
+
 int lvconvert_poll(struct cmd_context *cmd, struct logical_volume *lv,
 		   unsigned background)
 {
@@ -344,8 +387,12 @@ int lvconvert_poll(struct cmd_context *c
 	if (!dm_snprintf(lv_full_name, len, "%s/%s",
 			 lv->vg->name, lv->name))
 		return_0;
-	return poll_daemon(cmd, lv_full_name, background, 0,
-			   &_lvconvert_mirror_fns, "Converted");
+	if (!lv->merging_snapshot)
+		return poll_daemon(cmd, lv_full_name, background, 0,
+				&_lvconvert_mirror_fns, "Converted");
+	else
+		return poll_daemon(cmd, lv_full_name, background, 0,
+				&_lvconvert_merge_fns, "Merged");
 }
 
 static int _insert_lvconvert_layer(struct cmd_context *cmd,
@@ -758,6 +805,9 @@ static int lvconvert_merge(struct cmd_co
 		return 0;
 	}
 
+	lp->need_polling = 1;
+	lp->lv_to_poll = origin;
+
 	log_print("Merging of volume %s started.", lv->name);
 
 	return 1;