raid10: increment write counter after bio is split

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@intel.com>
Reviewed-by: Artur Paszkiewicz <artur.paszkiewicz@intel.com>
Signed-off-by: Shaohua Li <shli@fb.com>

diff --git a/drivers/md/raid10.c b/drivers/md/raid10.c
index ed29fc899f068943203480d01e1401b6adabe167..1a632a8c80050b0ef632496ca51bdadec354e117 100644 (file)
--- a/drivers/md/raid10.c
+++ b/drivers/md/raid10.c
@@ -1064,6 +1064,8 @@ static void __make_request(struct mddev *mddev, struct bio *bio)
        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.
@@ -1445,8 +1447,6 @@ static void raid10_make_request(struct mddev *mddev, struct bio *bio)
                return;
        }
 
-       md_write_start(mddev, bio);
-
        do {
 
                /*