rbd: use rbd_obj_watch_request_helper() helper
Switch rbd_dev_header_{un,}watch_sync() to use the new helper and fix
rbd_dev_header_unwatch_sync() to destroy watch_request structures
before queuing watch-remove message while at it. This mistake slipped
into commit b30a01f2a307 ("rbd: fix osd_request memory leak in
__rbd_dev_header_watch_sync()") and could lead to "image still in use"
errors on image removal.
Signed-off-by: Ilya Dryomov <ilya.dryomov@inktank.com>
Reviewed-by: Alex Elder <elder@linaro.org>
diff --git a/drivers/block/rbd.c b/drivers/block/rbd.c
index 02cf7ab..d99aa81 100644
--- a/drivers/block/rbd.c
+++ b/drivers/block/rbd.c
@@ -3040,130 +3040,49 @@
if (ret < 0)
return ret;
- rbd_assert(rbd_dev->watch_event);
-
- obj_request = rbd_obj_request_create(rbd_dev->header_name, 0, 0,
- OBJ_REQUEST_NODATA);
- if (!obj_request) {
- ret = -ENOMEM;
- goto out_cancel;
+ obj_request = rbd_obj_watch_request_helper(rbd_dev, true);
+ if (IS_ERR(obj_request)) {
+ ceph_osdc_cancel_event(rbd_dev->watch_event);
+ rbd_dev->watch_event = NULL;
+ return PTR_ERR(obj_request);
}
- obj_request->osd_req = rbd_osd_req_create(rbd_dev, true, 1,
- obj_request);
- if (!obj_request->osd_req) {
- ret = -ENOMEM;
- goto out_put;
- }
-
- ceph_osdc_set_request_linger(osdc, obj_request->osd_req);
-
- osd_req_op_watch_init(obj_request->osd_req, 0, CEPH_OSD_OP_WATCH,
- rbd_dev->watch_event->cookie, 0, 1);
- rbd_osd_req_format_write(obj_request);
-
- ret = rbd_obj_request_submit(osdc, obj_request);
- if (ret)
- goto out_linger;
-
- ret = rbd_obj_request_wait(obj_request);
- if (ret)
- goto out_linger;
-
- ret = obj_request->result;
- if (ret)
- goto out_linger;
-
/*
* A watch request is set to linger, so the underlying osd
* request won't go away until we unregister it. We retain
* a pointer to the object request during that time (in
- * rbd_dev->watch_request), so we'll keep a reference to
- * it. We'll drop that reference (below) after we've
- * unregistered it.
+ * rbd_dev->watch_request), so we'll keep a reference to it.
+ * We'll drop that reference after we've unregistered it in
+ * rbd_dev_header_unwatch_sync().
*/
rbd_dev->watch_request = obj_request;
return 0;
-
-out_linger:
- ceph_osdc_unregister_linger_request(osdc, obj_request->osd_req);
-out_put:
- rbd_obj_request_put(obj_request);
-out_cancel:
- ceph_osdc_cancel_event(rbd_dev->watch_event);
- rbd_dev->watch_event = NULL;
-
- return ret;
}
/*
* Tear down a watch request, synchronously.
*/
-static int __rbd_dev_header_unwatch_sync(struct rbd_device *rbd_dev)
+static void rbd_dev_header_unwatch_sync(struct rbd_device *rbd_dev)
{
- struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc;
struct rbd_obj_request *obj_request;
- int ret;
rbd_assert(rbd_dev->watch_event);
rbd_assert(rbd_dev->watch_request);
- obj_request = rbd_obj_request_create(rbd_dev->header_name, 0, 0,
- OBJ_REQUEST_NODATA);
- if (!obj_request) {
- ret = -ENOMEM;
- goto out_cancel;
- }
-
- obj_request->osd_req = rbd_osd_req_create(rbd_dev, true, 1,
- obj_request);
- if (!obj_request->osd_req) {
- ret = -ENOMEM;
- goto out_put;
- }
-
- osd_req_op_watch_init(obj_request->osd_req, 0, CEPH_OSD_OP_WATCH,
- rbd_dev->watch_event->cookie, 0, 0);
- rbd_osd_req_format_write(obj_request);
-
- ret = rbd_obj_request_submit(osdc, obj_request);
- if (ret)
- goto out_put;
-
- ret = rbd_obj_request_wait(obj_request);
- if (ret)
- goto out_put;
-
- ret = obj_request->result;
- if (ret)
- goto out_put;
-
- /* We have successfully torn down the watch request */
-
- ceph_osdc_unregister_linger_request(osdc,
- rbd_dev->watch_request->osd_req);
+ rbd_obj_request_end(rbd_dev->watch_request);
rbd_obj_request_put(rbd_dev->watch_request);
rbd_dev->watch_request = NULL;
-out_put:
- rbd_obj_request_put(obj_request);
-out_cancel:
+ obj_request = rbd_obj_watch_request_helper(rbd_dev, false);
+ if (!IS_ERR(obj_request))
+ rbd_obj_request_put(obj_request);
+ else
+ rbd_warn(rbd_dev, "unable to tear down watch request (%ld)",
+ PTR_ERR(obj_request));
+
ceph_osdc_cancel_event(rbd_dev->watch_event);
rbd_dev->watch_event = NULL;
-
- return ret;
-}
-
-static void rbd_dev_header_unwatch_sync(struct rbd_device *rbd_dev)
-{
- int ret;
-
- ret = __rbd_dev_header_unwatch_sync(rbd_dev);
- if (ret) {
- rbd_warn(rbd_dev, "unable to tear down watch request: %d\n",
- ret);
- }
}
/*