linux-kernel - [RFC PATCH 13/17] md/raid5: get rid of bio_fits

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Message-Id: <e35d37b66d621c51f2eb24ff024291bd1d53422e.1419241597.git.dongsu.park@profitbricks.com>
Date:	Mon, 22 Dec 2014 12:48:40 +0100
From:	Dongsu Park <dongsu.park@...fitbricks.com>
To:	linux-kernel@...r.kernel.org
Cc:	Jens Axboe <axboe@...nel.dk>, Kent Overstreet <kmo@...erainc.com>,
	Ming Lin <mlin@...ggr.net>,
	Dongsu Park <dongsu.park@...fitbricks.com>,
	Neil Brown <neilb@...e.de>, linux-raid@...r.kernel.org
Subject: [RFC PATCH 13/17] md/raid5: get rid of bio_fits_rdev()

From: Kent Overstreet <kmo@...erainc.com>

Remove bio_fits_rdev() completely, because ->merge_bvec_fn() has now
gone. There's no point in calling bio_fits_rdev() only for ensuring
aligned read from rdev.

Signed-off-by: Kent Overstreet <kmo@...erainc.com>
[dpark: add more description in commit message]
Signed-off-by: Dongsu Park <dongsu.park@...fitbricks.com>
Cc: Neil Brown <neilb@...e.de>
Cc: linux-raid@...r.kernel.org
---
 drivers/md/raid5.c | 23 +----------------------
 1 file changed, 1 insertion(+), 22 deletions(-)

diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c
index c1b0d52..40e464c 100644
--- a/drivers/md/raid5.c
+++ b/drivers/md/raid5.c
@@ -4218,25 +4218,6 @@ static void raid5_align_endio(struct bio *bi, int error)
 	add_bio_to_retry(raid_bi, conf);
 }
 
-static int bio_fits_rdev(struct bio *bi)
-{
-	struct request_queue *q = bdev_get_queue(bi->bi_bdev);
-
-	if (bio_sectors(bi) > queue_max_sectors(q))
-		return 0;
-	blk_recount_segments(q, bi);
-	if (bi->bi_phys_segments > queue_max_segments(q))
-		return 0;
-
-	if (q->merge_bvec_fn)
-		/* it's too hard to apply the merge_bvec_fn at this stage,
-		 * just just give up
-		 */
-		return 0;
-
-	return 1;
-}
-
 static int chunk_aligned_read(struct mddev *mddev, struct bio * raid_bio)
 {
 	struct r5conf *conf = mddev->private;
@@ -4290,11 +4271,9 @@ static int chunk_aligned_read(struct mddev *mddev, struct bio * raid_bio)
 		align_bi->bi_bdev =  rdev->bdev;
 		__clear_bit(BIO_SEG_VALID, &align_bi->bi_flags);
 
-		if (!bio_fits_rdev(align_bi) ||
-		    is_badblock(rdev, align_bi->bi_iter.bi_sector,
+		if (is_badblock(rdev, align_bi->bi_iter.bi_sector,
 				bio_sectors(align_bi),
 				&first_bad, &bad_sectors)) {
-			/* too big in some way, or has a known bad block */
 			bio_put(align_bi);
 			rdev_dec_pending(rdev, mddev);
 			return 0;
-- 
2.1.0

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