md/raid5: remove redundant bio initialisations.

We current initialise some fields of a bio when preparing a
stripe_head, and again just before submitting the request.

Remove the duplication by only setting the fields that lower level
devices don't touch in raid5_build_block, and only set the changeable
fields in ops_run_io.

Reviewed-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: NeilBrown <neilb@suse.de>

diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c
index 94bc35b..2d2aaf6 100644 (file)
--- a/drivers/md/raid5.c
+++ b/drivers/md/raid5.c
@@ -574,10 +574,7 @@ static void ops_run_io(struct stripe_head *sh, struct stripe_head_state *s)
                        atomic_inc(&sh->count);
                        bi->bi_sector = sh->sector + rdev->data_offset;
                        bi->bi_flags = 1 << BIO_UPTODATE;
-                       bi->bi_vcnt = 1;
-                       bi->bi_max_vecs = 1;
                        bi->bi_idx = 0;
-                       bi->bi_io_vec = &sh->dev[i].vec;
                        bi->bi_io_vec[0].bv_len = STRIPE_SIZE;
                        bi->bi_io_vec[0].bv_offset = 0;
                        bi->bi_size = STRIPE_SIZE;
@@ -1720,12 +1717,8 @@ static void raid5_build_block(struct stripe_head *sh, int i, int previous)
        dev->req.bi_io_vec = &dev->vec;
        dev->req.bi_vcnt++;
        dev->req.bi_max_vecs++;
-       dev->vec.bv_page = dev->page;
-       dev->vec.bv_len = STRIPE_SIZE;
-       dev->vec.bv_offset = 0;
-
-       dev->req.bi_sector = sh->sector;
        dev->req.bi_private = sh;
+       dev->vec.bv_page = dev->page;
 
        dev->flags = 0;
        dev->sector = compute_blocknr(sh, i, previous);