[RESEND PATCH V5 13/33] block: introduce rq_for_each_segment()

[Ming Lei]

There are still cases in which rq_for_each_segment() is required, for
example, loop.

Signed-off-by: Ming Lei <ming....@redhat.com>
---
 include/linux/blkdev.h | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index 1e8e9b430008..0b15bc625bd7 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -953,6 +953,10 @@ struct req_iterator {
        __rq_for_each_bio(_iter.bio, _rq)                       \
                bio_for_each_page(bvl, _iter.bio, _iter.iter)
 
+#define rq_for_each_segment(bvl, _rq, _iter)                   \
+       __rq_for_each_bio(_iter.bio, _rq)                       \
+               bio_for_each_segment(bvl, _iter.bio, _iter.iter)
+
 #define rq_iter_last(bvec, _iter)                              \
                (_iter.bio->bi_next == NULL &&                  \
                 bio_iter_last(bvec, _iter.iter))
-- 
2.9.5