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

From	Ming Lei <ming.lei@redhat.com>
Newsgroups	linux.kernel
Subject	[PATCH v2 30/51] block: introduce bvec_get_last_page()
Date	2017-06-26 14:20 +0200
Message-ID	<tWB9L-2fr-1@gated-at.bofh.it> (permalink)
References	<tWB9L-2fr-3@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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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

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[PATCH v2 30/51] block: introduce bvec_get_last_page() Ming Lei <ming.lei@redhat.com> - 2017-06-26 14:20 +0200

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