Re: [PATCH 5/8] lib/scatterlist: Add sg_len helper
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From: Stephan Mueller <hidden>
Date: 2015-09-09 16:27:11
Am Mittwoch, 9. September 2015, 09:15:26 schrieb Tadeusz Struk: Hi Tadeusz,
quoted hunk ↗ jump to hunk
Add sg_len function which returns the total number of bytes in sg. Signed-off-by: Tadeusz Struk <redacted> --- 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 9b1ef0c..7c82fc1 100644 --- a/include/linux/scatterlist.h +++ b/include/linux/scatterlist.h@@ -246,6 +246,7 @@ 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 d105a9f..71324bb 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)
unsigned int?
+{
+ 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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