From: Zach Brown <zab@xxxxxxxxx>
Signed-off-by: Dave Kleikamp <dave.kleikamp@xxxxxxxxxx>
Cc: Zach Brown <zab@xxxxxxxxx>
---
include/linux/bio.h | 8 ++++++++
1 file changed, 8 insertions(+)
diff --git a/include/linux/bio.h b/include/linux/bio.h
index 129a9c0..913087d 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;
+}
+
/*
* bio_set is used to allow other portions of the IO system to
* allocate their own private memory pools for bio and iovec structures.
--
1.7.9.2
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