drbd: serialize admin requests for new verify run with pending bitmap io

This is an addendum to
 drbd: serialize admin requests for new resync with pending bitmap io

It avoids a race that could trigger "FIXME" assert log messages.

Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com>
Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>

1 files changed, 5 insertions, 0 deletions

diff --git a/drivers/block/drbd/drbd_nl.c b/drivers/block/drbd/drbd_nl.c
index bc0bcb964603..87aaa7fc4d27 100644
--- a/drivers/block/drbd/drbd_nl.c
+++ b/drivers/block/drbd/drbd_nl.c
@@ -2106,6 +2106,11 @@ static int drbd_nl_start_ov(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
                 reply->ret_code = ERR_MANDATORY_TAG;
                 return 0;
         }
+
+        /* If there is still bitmap IO pending, e.g. previous resync or verify
+         * just being finished, wait for it before requesting a new resync. */
+        wait_event(mdev->misc_wait, !test_bit(BITMAP_IO, &mdev->flags));
+
         /* w_make_ov_request expects position to be aligned */
         mdev->ov_start_sector = args.start_sector & ~BM_SECT_PER_BIT;
         reply->ret_code = drbd_request_state(mdev,NS(conn,C_VERIFY_S));