Am Montag, 21. September 2015, 16:44:14 schrieb Tadeusz Struk:
Hi Tadeusz,
>Add sg_len function which returns the total number of bytes in sg.
>
>Signed-off-by: Tadeusz Struk <tadeusz.struk@xxxxxxxxx>
>---
> include/linux/scatterlist.h | 1 +
> lib/scatterlist.c | 18 ++++++++++++++++++
> 2 files changed, 19 insertions(+)
>
>diff --git a/include/linux/scatterlist.h b/include/linux/scatterlist.h
>index 556ec1e..1ca63bd 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);
>+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..dc71f27 100644
>--- a/lib/scatterlist.c
>+++ b/lib/scatterlist.c
>@@ -57,6 +57,24 @@ 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 how the total size of bytes in sg, taking into acount
>+ * chaining as well
>+ **/
>+int sg_len(struct scatterlist *sg)
>+{
>+ int len;
Is there a reason why unsigned int is not used? Note, this applies to the
users of that function too.
>+
>+ 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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Ciao
Stephan
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