[PATCH v2 30/51] block: introduce bvec_get_last_page()

Ming Lei
2017-06-26T12:17:58Z

BTRFS and guard_bio_eod() need to get the last page, so introduce
this helper to make them happy.

Signed-off-by: Ming Lei <ming.lei@redhat.com>
---
include/linux/bvec.h | 14 ++++++++++++++
1 file changed, 14 insertions(+)

diff --git a/include/linux/bvec.h b/include/linux/bvec.h
index 7addceea9828..6673e3c0b7eb 100644
--- a/include/linux/bvec.h
+++ b/include/linux/bvec.h
@@ -206,4 +206,18 @@ static inline void bvec_iter_advance_mp(const struct bio_vec *bv,
#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)

+/*
+ * get the last page from the multipage bvec and store it
+ * in @sp_bv
+ */
+static inline void bvec_get_last_page(struct bio_vec *mp_bv,
+ struct bio_vec *sp_bv)
+{
+ struct bvec_iter iter;
+
+ *sp_bv = *mp_bv;
+ bvec_for_each_sp_bvec(*sp_bv, mp_bv, iter)
+ ;
+}
+
#endif /* __LINUX_BVEC_ITER_H */
--
2.9.4