The patch titled
Subject: scatterlist: add sg_nents
has been added to the -mm tree. Its filename is
scatterlist-add-sg_nents.patch
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------------------------------------------------------
From: Maxim Levitsky <maximlevitsky@xxxxxxxxx>
Subject: scatterlist: add sg_nents
Useful helper to know the number of entries in scatterlist.
Signed-off-by: Maxim Levitsky <maximlevitsky@xxxxxxxxx>
Cc: Alex Dubov <oakad@xxxxxxxxx>
Acked-by: Tejun Heo <tj@xxxxxxxxxx>
Cc: Jens Axboe <axboe@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/linux/scatterlist.h | 1 +
lib/scatterlist.c | 22 ++++++++++++++++++++++
2 files changed, 23 insertions(+)
diff -puN include/linux/scatterlist.h~scatterlist-add-sg_nents include/linux/scatterlist.h
--- a/include/linux/scatterlist.h~scatterlist-add-sg_nents
+++ a/include/linux/scatterlist.h
@@ -201,6 +201,7 @@ static inline void *sg_virt(struct scatt
return page_address(sg_page(sg)) + sg->offset;
}
+int sg_nents(struct scatterlist *sg);
struct scatterlist *sg_next(struct scatterlist *);
struct scatterlist *sg_last(struct scatterlist *s, unsigned int);
void sg_init_table(struct scatterlist *, unsigned int);
diff -puN lib/scatterlist.c~scatterlist-add-sg_nents lib/scatterlist.c
--- a/lib/scatterlist.c~scatterlist-add-sg_nents
+++ a/lib/scatterlist.c
@@ -39,6 +39,28 @@ struct scatterlist *sg_next(struct scatt
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
* @nents: Number of entries in the scatterlist
_
Patches currently in -mm which might be from maximlevitsky@xxxxxxxxx are
scatterlist-atomic-sg_mapping_iter-no-longer-needs-disabled-irqs.patch
scatterlist-add-sg_nents.patch
memstick-add-support-for-legacy-memorysticks.patch
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