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rbd: complete notifies before cleaning up osd_client and rbd_dev

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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@inktank.com>
Reviewed-by: Alex Elder <elder@linaro.org>
This commit is contained in:
Josh Durgin 2013-08-29 17:31:03 -07:00
parent dd935f44a4
commit 9abc59908e
1 changed files with 7 additions and 0 deletions
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7
drivers/block/rbd.c
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@ -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);