From: Dave Kleikamp <dave.kleikamp@oracle.com>
Date: Thu, 12 Jan 2012 21:38:31 +0000 (-0600)
Subject: bio: add bvec_length(), like iov_length()
X-Git-Tag: v2.6.39-400.9.0~594^2~6
X-Git-Url: https://www.infradead.org/git/?a=commitdiff_plain;h=bfca85b7edc009956b4a187ddab737cf907557f7;p=users%2Fjedix%2Flinux-maple.git

bio: add bvec_length(), like iov_length()

Signed-off-by: Zach Brown <zach.brown@oracle.com>
---

diff --git a/include/linux/bio.h b/include/linux/bio.h
index ce33e6868a2f5..428058f6cb953 100644
--- a/include/linux/bio.h
+++ b/include/linux/bio.h
@@ -268,6 +268,14 @@ extern struct bio_vec *bvec_alloc_bs(gfp_t, int, unsigned long *, struct bio_set
 extern void bvec_free_bs(struct bio_set *, struct bio_vec *, unsigned int);
 extern unsigned int bvec_nr_vecs(unsigned short idx);
 
+static inline ssize_t bvec_length(const struct bio_vec *bvec, unsigned long nr)
+{
+	ssize_t bytes = 0;
+	while (nr--)
+		bytes += (bvec++)->bv_len;
+	return bytes;
+}
+
 /*
  * Allow queuer to specify a completion CPU for this bio
  */