linux-kernel - [PATCH 3.18 064/145] raid10: increment write counter after bio is split

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Date:   Sun, 16 Apr 2017 12:49:17 +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,
        Tomasz Majchrzak <tomasz.majchrzak@...el.com>,
        Artur Paszkiewicz <artur.paszkiewicz@...el.com>,
        Shaohua Li <shli@...com>
Subject: [PATCH 3.18 064/145] raid10: increment write counter after bio is split

3.18-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Tomasz Majchrzak <tomasz.majchrzak@...el.com>

commit 9b622e2bbcf049c82e2550d35fb54ac205965f50 upstream.

md pending write counter must be incremented after bio is split,
otherwise it gets decremented too many times in end bio callback and
becomes negative.

Signed-off-by: Tomasz Majchrzak <tomasz.majchrzak@...el.com>
Reviewed-by: Artur Paszkiewicz <artur.paszkiewicz@...el.com>
Signed-off-by: Shaohua Li <shli@...com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/md/raid10.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/drivers/md/raid10.c
+++ b/drivers/md/raid10.c
@@ -1171,6 +1171,8 @@ static void __make_request(struct mddev
 	int max_sectors;
 	int sectors;
 
+	md_write_start(mddev, bio);
+
 	/*
 	 * Register the new request and wait if the reconstruction
 	 * thread has put up a bar for new requests.
@@ -1556,8 +1558,6 @@ static void make_request(struct mddev *m
 		return;
 	}
 
-	md_write_start(mddev, bio);
-
 	do {
 
 		/*