3.11.10.3 -stable review patch. If anyone has any objections, please let me know.
------------------
From: Josh Durgin <josh.durgin@xxxxxxxxxxx>
commit 9abc59908e0c5f983aaa91150da32d5b62cf60b7 upstream.
To ensure rbd_dev is not used after it's released, flush all pending
notify callbacks before calling rbd_dev_image_release(). No new
notifies can be added to the queue at this point because the watch has
already be unregistered with the osd_client.
Signed-off-by: Josh Durgin <josh.durgin@xxxxxxxxxxx>
Reviewed-by: Alex Elder <elder@xxxxxxxxxx>
Signed-off-by: Luis Henriques <luis.henriques@xxxxxxxxxxxxx>
---
drivers/block/rbd.c | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/drivers/block/rbd.c b/drivers/block/rbd.c
index 853e622..16f6966 100644
--- a/drivers/block/rbd.c
+++ b/drivers/block/rbd.c
@@ -5163,6 +5163,13 @@ static ssize_t rbd_remove(struct bus_type *bus,
ret = rbd_dev_header_watch_sync(rbd_dev, false);
if (ret)
rbd_warn(rbd_dev, "failed to cancel watch event (%d)\n", ret);
+
+ /*
+ * flush remaining watch callbacks - these must be complete
+ * before the osd_client is shutdown
+ */
+ dout("%s: flushing notifies", __func__);
+ ceph_osdc_flush_notifies(&rbd_dev->rbd_client->client->osdc);
rbd_dev_image_release(rbd_dev);
module_put(THIS_MODULE);
--
1.8.3.2
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