linux-kernel - [PATCH V8 16/33] bio: add bvec_length(), like iov

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Date:	Thu, 25 Jul 2013 12:50:42 -0500
From:	Dave Kleikamp <dave.kleikamp@...cle.com>
To:	linux-kernel@...r.kernel.org
Cc:	linux-fsdevel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	"Maxim V. Patlasov" <mpatlasov@...allels.com>,
	Zach Brown <zab@...bo.net>,
	Dave Kleikamp <dave.kleikamp@...cle.com>
Subject: [PATCH V8 16/33] bio: add bvec_length(), like iov_length()

From: Zach Brown <zab@...bo.net>

Signed-off-by: Dave Kleikamp <dave.kleikamp@...cle.com>
Cc: Zach Brown <zab@...bo.net>
---
 include/linux/bio.h | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/include/linux/bio.h b/include/linux/bio.h
index ec48bac..4fd5253 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);
-- 
1.8.3.4

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