From: Shaohua Li <shli@fb.com>
Date: Tue, 23 Aug 2016 04:14:02 +0000 (-0700)
Subject: raid5: avoid unnecessary bio data set
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=45c91d808ff989d950e260dab9f89e8f4a3c9c2c;p=linux-beck.git

raid5: avoid unnecessary bio data set

bio_reset doesn't change bi_io_vec and bi_max_vecs, so we don't need to
set them every time. bi_private will be set before the bio is
dispatched.

Signed-off-by: Shaohua Li <shli@fb.com>
---

diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c
index d1a279b1916b..62febe8d4919 100644
--- a/drivers/md/raid5.c
+++ b/drivers/md/raid5.c
@@ -2005,7 +2005,12 @@ static struct stripe_head *alloc_stripe(struct kmem_cache *sc, gfp_t gfp,
 			struct r5dev *dev = &sh->dev[i];
 
 			bio_init(&dev->req);
+			dev->req.bi_io_vec = &dev->vec;
+			dev->req.bi_max_vecs = 1;
+
 			bio_init(&dev->rreq);
+			dev->rreq.bi_io_vec = &dev->rvec;
+			dev->rreq.bi_max_vecs = 1;
 		}
 	}
 	return sh;
@@ -2507,14 +2512,6 @@ static void raid5_build_block(struct stripe_head *sh, int i, int previous)
 {
 	struct r5dev *dev = &sh->dev[i];
 
-	dev->req.bi_io_vec = &dev->vec;
-	dev->req.bi_max_vecs = 1;
-	dev->req.bi_private = sh;
-
-	dev->rreq.bi_io_vec = &dev->rvec;
-	dev->rreq.bi_max_vecs = 1;
-	dev->rreq.bi_private = sh;
-
 	dev->flags = 0;
 	dev->sector = raid5_compute_blocknr(sh, i, previous);
 }