linux-kernel - [PATCH v3 08/15] md/raid5: Move read_seqcount_begin() into make_stripe

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Date:   Thu, 16 Jun 2022 13:19:38 -0600
From:   Logan Gunthorpe <logang@...tatee.com>
To:     linux-kernel@...r.kernel.org, linux-raid@...r.kernel.org,
        Song Liu <song@...nel.org>
Cc:     Christoph Hellwig <hch@...radead.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>,
        Christoph Hellwig <hch@....de>
Subject: [PATCH v3 08/15] md/raid5: Move read_seqcount_begin() into make_stripe_request()

Now that prepare_to_wait() isn't in the way, move read_sequcount_begin()
into make_stripe_request().

No functional changes intended.

Signed-off-by: Logan Gunthorpe <logang@...tatee.com>
Reviewed-by: Christoph Hellwig <hch@....de>
Reviewed-by: Guoqing Jiang <guoqing.jiang@...ux.dev>
---
 drivers/md/raid5.c | 12 +++++-------
 1 file changed, 5 insertions(+), 7 deletions(-)

diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c
index c58e70db204a..345350d34623 100644
--- a/drivers/md/raid5.c
+++ b/drivers/md/raid5.c
@@ -5800,14 +5800,16 @@ struct stripe_request_ctx {
 
 static enum stripe_result make_stripe_request(struct mddev *mddev,
 		struct r5conf *conf, struct stripe_request_ctx *ctx,
-		sector_t logical_sector, struct bio *bi, int seq)
+		sector_t logical_sector, struct bio *bi)
 {
 	const int rw = bio_data_dir(bi);
 	enum stripe_result ret;
 	struct stripe_head *sh;
 	sector_t new_sector;
 	int previous = 0;
-	int dd_idx;
+	int seq, dd_idx;
+
+	seq = read_seqcount_begin(&conf->gen_lock);
 
 	if (unlikely(conf->reshape_progress != MaxSector)) {
 		/*
@@ -5973,13 +5975,9 @@ static bool raid5_make_request(struct mddev *mddev, struct bio * bi)
 	md_account_bio(mddev, &bi);
 	prepare_to_wait(&conf->wait_for_overlap, &w, TASK_UNINTERRUPTIBLE);
 	for (; logical_sector < last_sector; logical_sector += RAID5_STRIPE_SECTORS(conf)) {
-		int seq;
-
 	retry:
-		seq = read_seqcount_begin(&conf->gen_lock);
-
 		res = make_stripe_request(mddev, conf, &ctx, logical_sector,
-					  bi, seq);
+					  bi);
 		if (res == STRIPE_FAIL)
 			break;
 
-- 
2.30.2