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 | 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 -- To unsubscribe from this list: send the line "unsubscribe linux-crypto" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html