From: Zach Brown <zab@zabbo.net>
Date: Fri, 14 Jun 2013 20:54:19 +0000 (-0500)
Subject: bio: add bvec_length(), like iov_length()
X-Git-Tag: next-20130919~60^2~17
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=10b345c214c5d151c55dc0665456de7c3ace5fb5;p=karo-tx-linux.git

bio: add bvec_length(), like iov_length()

Signed-off-by: Zach Brown <zab@zabbo.net>
Signed-off-by: Dave Kleikamp <dave.kleikamp@oracle.com>
Tested-by: Sedat Dilek <sedat.dilek@gmail.com>
---

diff --git a/include/linux/bio.h b/include/linux/bio.h
index ec48bac5b039..4fd525342596 100644
--- a/include/linux/bio.h
+++ b/include/linux/bio.h
@@ -307,6 +307,14 @@ extern struct bio_vec *bvec_alloc(gfp_t, int, unsigned long *, mempool_t *);
 extern void bvec_free(mempool_t *, 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;
+}
+
 #ifdef CONFIG_BLK_CGROUP
 int bio_associate_current(struct bio *bio);
 void bio_disassociate_task(struct bio *bio);