linux-kernel - [PATCH 5.19 312/365] md/raid5: Make logic blocking check consistent with logic that blocks

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Message-Id: <20220823080131.232792593@linuxfoundation.org>
Date:   Tue, 23 Aug 2022 10:03:33 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Logan Gunthorpe <logang@...tatee.com>,
        Song Liu <song@...nel.org>, Jens Axboe <axboe@...nel.dk>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.19 312/365] md/raid5: Make logic blocking check consistent with logic that blocks

From: Logan Gunthorpe <logang@...tatee.com>

[ Upstream commit 6e3f50d30af847bebce072182bd735e90a294c6a ]

The check in raid5_make_request differs very slightly from the logic
that causes it to block lower down. This likely does not cause a bug
as the check is fuzzy anyway (as reshape may move on between the first
check and the subsequent check). However, make it consistent so it can
be cleaned up in a subsequent patch.

The condition which causes the schedule is:

 !(mddev->reshape_backwards ? logical_sector < conf->reshape_progress :
   logical_sector >= conf->reshape_progress) &&
  (mddev->reshape_backwards ? logical_sector < conf->reshape_safe :
   logical_sector >= conf->reshape_safe)

The condition that causes the early bailout is made to match this.

Signed-off-by: Logan Gunthorpe <logang@...tatee.com>
Signed-off-by: Song Liu <song@...nel.org>
Signed-off-by: Jens Axboe <axboe@...nel.dk>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/md/raid5.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c
index c8539d0e12dd..45482cebacdb 100644
--- a/drivers/md/raid5.c
+++ b/drivers/md/raid5.c
@@ -5841,7 +5841,7 @@ static bool raid5_make_request(struct mddev *mddev, struct bio * bi)
 	if ((bi->bi_opf & REQ_NOWAIT) &&
 	    (conf->reshape_progress != MaxSector) &&
 	    (mddev->reshape_backwards
-	    ? (logical_sector > conf->reshape_progress && logical_sector <= conf->reshape_safe)
+	    ? (logical_sector >= conf->reshape_progress && logical_sector < conf->reshape_safe)
 	    : (logical_sector >= conf->reshape_safe && logical_sector < conf->reshape_progress))) {
 		bio_wouldblock_error(bi);
 		if (rw == WRITE)
-- 
2.35.1