linux-kernel - [PATCH v1 2/8] md/raid5: Move stripe_add_to_batch_list() call out of add_stripe

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Date:   Thu,  7 Apr 2022 10:45:05 -0600
From:   Logan Gunthorpe <logang@...tatee.com>
To:     linux-kernel@...r.kernel.org, linux-raid@...r.kernel.org,
        Song Liu <song@...nel.org>
Cc:     Shaohua Li <shli@...nel.org>,
        Guoqing Jiang <guoqing.jiang@...ux.dev>,
        Stephen Bates <sbates@...thlin.com>,
        Martin Oliveira <Martin.Oliveira@...eticom.com>,
        David Sloan <David.Sloan@...eticom.com>,
        Logan Gunthorpe <logang@...tatee.com>
Subject: [PATCH v1 2/8] md/raid5: Move stripe_add_to_batch_list() call out of add_stripe_bio()

stripe_add_to_batch_list() is better done in the loop in make_request
instead of inside add_stripe_bio(). This is clearer and allows for
storing the batch_head state outside the loop in a subsequent patch.

The call to add_stripe_bio() in retry_aligned_read() is for a read only
and thus wouldn't have added the batch anyway.

No functional changes intended.

Signed-off-by: Logan Gunthorpe <logang@...tatee.com>
---
 drivers/md/raid5.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c
index b794253efd15..e3c75b3b8923 100644
--- a/drivers/md/raid5.c
+++ b/drivers/md/raid5.c
@@ -3504,8 +3504,6 @@ static int add_stripe_bio(struct stripe_head *sh, struct bio *bi, int dd_idx,
 	}
 	spin_unlock_irq(&sh->stripe_lock);
 
-	if (stripe_can_batch(sh))
-		stripe_add_to_batch_list(conf, sh);
 	return 1;
 
  overlap:
@@ -5918,6 +5916,9 @@ static bool raid5_make_request(struct mddev *mddev, struct bio * bi)
 			goto retry;
 		}
 
+		if (stripe_can_batch(sh))
+			stripe_add_to_batch_list(conf, sh);
+
 		if (do_flush) {
 			set_bit(STRIPE_R5C_PREFLUSH, &sh->state);
 			/* we only need flush for one stripe */
-- 
2.30.2