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rbd: cancel watch request when releasing the device 

We were missing this cleanup, so when a device was released
the osd didn't clean up its watchers list, so following notifications
could be slow as osd needed to timeout on the client.

Signed-off-by: Yehuda Sadeh <yehuda@hq.newdream.net>
This commit is contained in:
Yehuda Sadeh 2011-07-12 16:56:57 -07:00 committed by Sage Weil
parent 2f90b852e3
commit 79e3057c4c
1 changed files with 30 additions and 1 deletions
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31
drivers/block/rbd.c
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@ -1253,6 +1253,35 @@ fail:
return ret;
}
/*
* Request sync osd unwatch
*/
static int rbd_req_sync_unwatch(struct rbd_device *dev,
const char *obj)
{
struct ceph_osd_req_op *ops;
int ret = rbd_create_rw_ops(&ops, 1, CEPH_OSD_OP_WATCH, 0);
if (ret < 0)
return ret;
ops[0].watch.ver = 0;
ops[0].watch.cookie = cpu_to_le64(dev->watch_event->cookie);
ops[0].watch.flag = 0;
ret = rbd_req_sync_op(dev, NULL,
CEPH_NOSNAP,
0,
CEPH_OSD_FLAG_WRITE | CEPH_OSD_FLAG_ONDISK,
ops,
1, obj, 0, 0, NULL, NULL, NULL);
rbd_destroy_ops(ops);
ceph_osdc_cancel_event(dev->watch_event);
dev->watch_event = NULL;
return ret;
}
struct rbd_notify_info {
struct rbd_device *dev;
};
@ -2290,7 +2319,7 @@ static void rbd_dev_release(struct device *dev)
ceph_osdc_unregister_linger_request(&rbd_dev->client->osdc,
rbd_dev->watch_request);
if (rbd_dev->watch_event)
ceph_osdc_cancel_event(rbd_dev->watch_event);
rbd_req_sync_unwatch(rbd_dev, rbd_dev->obj_md_name);
rbd_put_client(rbd_dev);