Ask For Comment: add new API related to sg_miter_start in scatter list

[Hillf Danton]

Like sg_miter_start, the new API also init the __offset element of miter
with given parameter.
Then the precesure of sg_miter_start, sg_miter_next and sg_miter_stop
could be carried out as smoothly as sg_copy_buffer does,  with
all __xyz elements of miter untouched outside miter.

Signed-off-by: Hillf Danton <dhillf@xxxxxxxxx>
---

--- o/linux-2.6.36-rc4/include/linux/scatterlist.h	2010-09-13
07:07:38.000000000 +0800
+++ m/linux-2.6.36-rc4/include/linux/scatterlist.h	2010-10-03
20:45:12.000000000 +0800
@@ -264,4 +264,18 @@ void sg_miter_start(struct sg_mapping_it
 bool sg_miter_next(struct sg_mapping_iter *miter);
 void sg_miter_stop(struct sg_mapping_iter *miter);

+/*
+ * like sg_miter_start, plus setting the offset in sg
+ */
+static void
+sg_miter_start_offset(struct sg_mapping_iter *miter,
+			struct scatterlist *sgl,
+			unsigned int nents,
+			unsigned int flags,
+			unsigned int offset)
+{
+	sg_miter_start(miter, sgl, nents, flags);
+	miter->__offset = offset;
+}
+
 #endif /* _LINUX_SCATTERLIST_H */
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