From 41a496fe998f5d5d18df89c60c7272b33e2c4908 Mon Sep 17 00:00:00 2001
From: Andrea Mazzoleni <amadvance@gmail.com>
Date: Mon, 19 Jan 2015 22:22:36 +0100
Subject: [PATCH] Add a new list count operation to TommyDS

---
 cmdline/device.c    |  6 +-----
 tommyds/tommylist.h | 17 +++++++++++++++++
 2 files changed, 18 insertions(+), 5 deletions(-)

diff --git a/cmdline/device.c b/cmdline/device.c
index ae8d72a0..8e439578 100644
--- a/cmdline/device.c
+++ b/cmdline/device.c
@@ -517,11 +517,7 @@ void state_device(struct snapraid_state* state, int operation)
 #endif
 
 	if (operation == DEVICE_SMART) {
-		/* count the logical disks forming the array */
-		unsigned count = state->level;
-		for (i = state->disklist; i != 0; i = i->next)
-			++count;
-		state_smart(count, &low);
+		state_smart(state->level + tommy_list_count(&state->disklist), &low);
 	}
 
 	tommy_list_foreach(&high, free);
diff --git a/tommyds/tommylist.h b/tommyds/tommylist.h
index ccee71af..8004a44a 100644
--- a/tommyds/tommylist.h
+++ b/tommyds/tommylist.h
@@ -298,6 +298,23 @@ tommy_inline tommy_bool_t tommy_list_empty(tommy_list* list)
 	return tommy_list_head(list) == 0;
 }
 
+/**
+ * Gets the number of elements.
+ * \note This operation is O(n).
+ */
+tommy_inline tommy_count_t tommy_list_count(tommy_list* list)
+{
+	tommy_count_t count = 0;
+	tommy_node* i = tommy_list_head(list);
+
+	while (i) {
+		++count;
+		i = i->next;
+	}
+
+	return count;
+}
+
 /**
  * Calls the specified function for each element in the list.
  *