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    Subject[PATCH 13/15] block: add helper function for iteration of bip's bvec
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    bip_for_each_vec() performs the iteration in a page unit.

    Since a bio_vec of bip is composed of multi-page in the block, a macro
    that can be carried out in multi-page units has been added.

    Cc: Christoph Hellwig <hch@lst.de>
    Cc: Martin K. Petersen <martin.petersen@oracle.com>

    Signed-off-by: Jinyoung Choi <j-young.choi@samsung.com>
    ---
    include/linux/bio.h | 4 ++++
    include/linux/bvec.h | 6 ++++++
    2 files changed, 10 insertions(+)

    diff --git a/include/linux/bio.h b/include/linux/bio.h
    index b53a595b519a..e3e437ce694c 100644
    --- a/include/linux/bio.h
    +++ b/include/linux/bio.h
    @@ -695,6 +695,10 @@ static inline bool bioset_initialized(struct bio_set *bs)

    #if defined(CONFIG_BLK_DEV_INTEGRITY)

    +/* iterate over multi-page bvec for integrity */
    +#define bip_for_each_mp_bvec(bvl, bip, iter) \
    + for_each_mp_bvec(bvl, (bip)->bip_vec, iter, (bip)->bip_iter)
    +
    #define bip_for_each_vec(bvl, bip, iter) \
    for_each_bvec(bvl, (bip)->bip_vec, iter, (bip)->bip_iter)

    diff --git a/include/linux/bvec.h b/include/linux/bvec.h
    index 555aae5448ae..9364c258513e 100644
    --- a/include/linux/bvec.h
    +++ b/include/linux/bvec.h
    @@ -184,6 +184,12 @@ static inline void bvec_iter_advance_single(const struct bio_vec *bv,
    ((bvl = bvec_iter_bvec((bio_vec), (iter))), 1); \
    bvec_iter_advance_single((bio_vec), &(iter), (bvl).bv_len))

    +#define for_each_mp_bvec(bvl, bio_vec, iter, start) \
    + for (iter = (start); \
    + (iter).bi_size && \
    + ((bvl = mp_bvec_iter_bvec((bio_vec), (iter))), 1); \
    + bvec_iter_advance_single((bio_vec), &(iter), (bvl).bv_len))
    +
    /* for iterating one bio from start to end */
    #define BVEC_ITER_ALL_INIT (struct bvec_iter) \
    { \
    --
    2.34.1
    \
     
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