Add sg_len function which returns the total number of bytes in sg.
Signed-off-by: Tadeusz Struk <[email protected]>
---
include/linux/scatterlist.h | 1 +
lib/scatterlist.c | 20 ++++++++++++++++++++
2 files changed, 21 insertions(+)
diff --git a/include/linux/scatterlist.h b/include/linux/scatterlist.h
index 556ec1e..dba8f78 100644
--- a/include/linux/scatterlist.h
+++ b/include/linux/scatterlist.h
@@ -242,6 +242,7 @@ static inline void *sg_virt(struct scatterlist *sg)
}
int sg_nents(struct scatterlist *sg);
+unsigned int sg_len(struct scatterlist *sg);
int sg_nents_for_len(struct scatterlist *sg, u64 len);
struct scatterlist *sg_next(struct scatterlist *);
struct scatterlist *sg_last(struct scatterlist *s, unsigned int);
diff --git a/lib/scatterlist.c b/lib/scatterlist.c
index bafa993..2ae4c53 100644
--- a/lib/scatterlist.c
+++ b/lib/scatterlist.c
@@ -57,6 +57,26 @@ int sg_nents(struct scatterlist *sg)
EXPORT_SYMBOL(sg_nents);
/**
+ * sg_len - return total size of bytes in the scatterlist
+ * @sg: The scatterlist
+ *
+ * Description:
+ * Allows to know the total size of bytes in an sg, taking into account
+ * chaining as well.
+ *
+ * Returns: total size of bytes in the scatterlist
+ **/
+unsigned int sg_len(struct scatterlist *sg)
+{
+ unsigned int len;
+
+ for (len = 0; sg; sg = sg_next(sg))
+ len += sg->length;
+ return len;
+}
+EXPORT_SYMBOL(sg_len);
+
+/**
* sg_nents_for_len - return total count of entries in scatterlist
* needed to satisfy the supplied length
* @sg: The scatterlist
--
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