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>

diff --git a/drivers/block/drbd/drbd_nl.c b/drivers/block/drbd/drbd_nl.c
index bc0bcb9..87aaa7f 100644 (file)
--- 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));