rbd: add rbd_obj_watch_request_helper() helper
In the past, rbd_dev_header_watch_sync() used to handle both watch and
unwatch requests and was entangled and leaky. Commit b30a01f2a307
("rbd: fix osd_request memory leak in __rbd_dev_header_watch_sync()")
split it into two separate functions. This commit cleanly abstracts
the common bits, relying on the fixed rbd_obj_request_wait().
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 20147ae..02cf7ab 100644
--- a/drivers/block/rbd.c
+++ b/drivers/block/rbd.c
@@ -2971,6 +2971,59 @@
}
/*
+ * Send a (un)watch request and wait for the ack. Return a request
+ * with a ref held on success or error.
+ */
+static struct rbd_obj_request *rbd_obj_watch_request_helper(
+ struct rbd_device *rbd_dev,
+ bool watch)
+{
+ struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc;
+ struct rbd_obj_request *obj_request;
+ int ret;
+
+ obj_request = rbd_obj_request_create(rbd_dev->header_name, 0, 0,
+ OBJ_REQUEST_NODATA);
+ if (!obj_request)
+ return ERR_PTR(-ENOMEM);
+
+ obj_request->osd_req = rbd_osd_req_create(rbd_dev, true, 1,
+ obj_request);
+ if (!obj_request->osd_req) {
+ ret = -ENOMEM;
+ goto out;
+ }
+
+ osd_req_op_watch_init(obj_request->osd_req, 0, CEPH_OSD_OP_WATCH,
+ rbd_dev->watch_event->cookie, 0, watch);
+ rbd_osd_req_format_write(obj_request);
+
+ if (watch)
+ ceph_osdc_set_request_linger(osdc, obj_request->osd_req);
+
+ ret = rbd_obj_request_submit(osdc, obj_request);
+ if (ret)
+ goto out;
+
+ ret = rbd_obj_request_wait(obj_request);
+ if (ret)
+ goto out;
+
+ ret = obj_request->result;
+ if (ret) {
+ if (watch)
+ rbd_obj_request_end(obj_request);
+ goto out;
+ }
+
+ return obj_request;
+
+out:
+ rbd_obj_request_put(obj_request);
+ return ERR_PTR(ret);
+}
+
+/*
* Initiate a watch request, synchronously.
*/
static int rbd_dev_header_watch_sync(struct rbd_device *rbd_dev)
