From 995c4275a7e14b8752f301e4570831a108ae4303 Mon Sep 17 00:00:00 2001 From: NeilBrown <neilb@suse.de> Date: Fri, 23 Dec 2011 10:17:52 +1100 Subject: [PATCH] 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> --- drivers/md/raid5.c | 9 +-------- 1 file changed, 1 insertion(+), 8 deletions(-) diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c index 94bc35ba4c81..2d2aaf6e98e2 100644 --- 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);