From: Lars Ellenberg Date: Thu, 6 Oct 2011 15:30:26 +0000 (+0200) Subject: drbd: fix spurious meta data IO "error" X-Git-Tag: firefly_0821_release~3680^2~2719^2^2~33 X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=a2e9138197405a4c051630416ceebf98158e631d;p=firefly-linux-kernel-4.4.55.git drbd: fix spurious meta data IO "error" When detaching, even cleanly detaching due to administrator request, we always go through D_FAILED before we become D_DISKLESS. Don't let that state change race with an in-flight meta data IO, or that one might think it actually experienced an IO error. Signed-off-by: Philipp Reisner Signed-off-by: Lars Ellenberg --- diff --git a/drivers/block/drbd/drbd_nl.c b/drivers/block/drbd/drbd_nl.c index 1a81d9ed1b24..00a82ab7ab98 100644 --- a/drivers/block/drbd/drbd_nl.c +++ b/drivers/block/drbd/drbd_nl.c @@ -1351,7 +1351,9 @@ static int drbd_nl_detach(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp, } drbd_suspend_io(mdev); /* so no-one is stuck in drbd_al_begin_io */ + drbd_md_get_buffer(mdev); /* make sure there is no in-flight meta-data IO */ retcode = drbd_request_state(mdev, NS(disk, D_FAILED)); + drbd_md_put_buffer(mdev); /* D_FAILED will transition to DISKLESS. */ ret = wait_event_interruptible(mdev->misc_wait, mdev->state.disk != D_FAILED);