[PATCH 4/6] block: set .bi_max_vecs as actual allocated vector number

[Ming Lei]

bvec_alloc() may allocate more bio vectors than requested, so set .bi_max_vecs 
as
actual allocated vector number, instead of the requested number. This way can 
help
fs build bigger bio because new bio often won't be allocated until the current 
one
becomes full.

Signed-off-by: Ming Lei <ming....@redhat.com>
---
 block/bio.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/block/bio.c b/block/bio.c
index 3991a5aab1bc..e567feb380b6 100644
--- a/block/bio.c
+++ b/block/bio.c
@@ -502,12 +502,13 @@ struct bio *bio_alloc_bioset(gfp_t gfp_mask, unsigned int 
nr_iovecs,
                        goto err_free;
 
                bio->bi_flags |= idx << BVEC_POOL_OFFSET;
+               bio->bi_max_vecs = bvec_nr_vecs(idx);
        } else if (nr_iovecs) {
                bvl = bio->bi_inline_vecs;
+               bio->bi_max_vecs = inline_vecs;
        }
 
        bio->bi_pool = bs;
-       bio->bi_max_vecs = nr_iovecs;
        bio->bi_io_vec = bvl;
        return bio;
 
-- 
2.28.0