raid5: need to set STRIPE_HANDLE for batch head

[ Upstream commit a7ede3d16808b8f3915c8572d783530a82b2f027 ]

With commit 6ce220dd2f8ea71d6afc29b9a7524c12e39f374a ("raid5: don't set
STRIPE_HANDLE to stripe which is in batch list"), we don't want to set
STRIPE_HANDLE flag for sh which is already in batch list.

However, the stripe which is the head of batch list should set this flag,
otherwise panic could happen inside init_stripe at BUG_ON(sh->batch_head),
it is reproducible with raid5 on top of nvdimm devices per Xiao oberserved.

Thanks for Xiao's effort to verify the change.

Fixes: 6ce220dd2f8ea ("raid5: don't set STRIPE_HANDLE to stripe which is in batch list")
Reported-by: Xiao Ni <xni@redhat.com>
Tested-by: Xiao Ni <xni@redhat.com>
Signed-off-by: Guoqing Jiang <guoqing.jiang@cloud.ionos.com>
Signed-off-by: Song Liu <songliubraving@fb.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c
index 4c49bed40f1fb4486a9e59257048fd5dc694d490..d5c14d56a71418bc0ee18a887494475711bf2378 100644 (file)
--- a/drivers/md/raid5.c
+++ b/drivers/md/raid5.c
@@ -5721,7 +5721,7 @@ static bool raid5_make_request(struct mddev *mddev, struct bio * bi)
                                do_flush = false;
                        }
 
-                       if (!sh->batch_head)
+                       if (!sh->batch_head || sh == sh->batch_head)
                                set_bit(STRIPE_HANDLE, &sh->state);
                        clear_bit(STRIPE_DELAYED, &sh->state);
                        if ((!sh->batch_head || sh == sh->batch_head) &&