From 2e484610296b25f0a04b516bc144a00731d1d845 Mon Sep 17 00:00:00 2001
From: Maxim Levitsky <maximlevitsky@gmail.com>
Date: Thu, 27 Sep 2012 12:45:28 +0200
Subject: scatterlist: add sg_nents

Useful helper to know the number of entries in scatterlist.

Signed-off-by: Maxim Levitsky <maximlevitsky@gmail.com>
Cc: Alex Dubov <oakad@yahoo.com>
Acked-by: Tejun Heo <tj@kernel.org>
Cc: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
---
 lib/scatterlist.c | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

(limited to 'lib')

diff --git a/lib/scatterlist.c b/lib/scatterlist.c
index fadae774a20c..1bf60efb5e02 100644
--- a/lib/scatterlist.c
+++ b/lib/scatterlist.c
@@ -38,6 +38,28 @@ struct scatterlist *sg_next(struct scatterlist *sg)
 }
 EXPORT_SYMBOL(sg_next);
 
+/**
+ * sg_nents - return total count of entries in scatterlist
+ * @sg:		The scatterlist
+ *
+ * Description:
+ * Allows to know how many entries are in sg, taking into acount
+ * chaining as well
+ *
+ **/
+int sg_nents(struct scatterlist *sg)
+{
+	int nents = 0;
+	while (sg) {
+		nents++;
+		sg = sg_next(sg);
+	}
+
+	return nents;
+}
+EXPORT_SYMBOL(sg_nents);
+
+
 /**
  * sg_last - return the last scatterlist entry in a list
  * @sgl:	First entry in the scatterlist
-- 
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