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>
---
drivers/block/rbd.c | 7 +++++++
1 files changed, 7 insertions(+), 0 deletions(-)
diff --git a/drivers/block/rbd.c b/drivers/block/rbd.c
index 8ab3362b..2223617 100644
--- a/drivers/block/rbd.c
+++ b/drivers/block/rbd.c
@@ -5190,6 +5190,13 @@ 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);
--
1.7.2.5
--
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