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    Subject[RFC PATCH v2 14/21] bio: add bvec_length(), like iov_length()
    Date
    From: Zach Brown <zab@zabbo.net>

    Signed-off-by: Dave Kleikamp <dave.kleikamp@oracle.com>
    Cc: Zach Brown <zab@zabbo.net>
    ---
    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.
    --
    1.7.9.5


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