This helper can be used to iterate each singlepage bvec
from one multipage bvec.
Signed-off-by: Ming Lei <[email protected]>
---
include/linux/bvec.h | 10 ++++++++++
1 file changed, 10 insertions(+)
diff --git a/include/linux/bvec.h b/include/linux/bvec.h
index e12ce6bd63d7..510d1d2d79f1 100644
--- a/include/linux/bvec.h
+++ b/include/linux/bvec.h
@@ -191,4 +191,14 @@ static inline void bvec_iter_advance_mp(const struct bio_vec *bv,
.bi_bvec_done = 0, \
}
+#define __bvec_for_each_sp_bvec(sp_bvl, mp_bvec, iter, start) \
+ for (iter = start, \
+ (iter).bi_size = (mp_bvec)->bv_len; \
+ (iter).bi_size && \
+ ((sp_bvl = bvec_iter_bvec((mp_bvec), (iter))), 1); \
+ bvec_iter_advance((mp_bvec), &(iter), (sp_bvl).bv_len))
+
+#define bvec_for_each_sp_bvec(sp_bvl, mp_bvec, iter) \
+ __bvec_for_each_sp_bvec(sp_bvl, mp_bvec, iter, BVEC_ITER_ALL_INIT)
+
#endif /* __LINUX_BVEC_ITER_H */
--
2.7.4