On 06/25/2014 12:16 PM, Ilya Dryomov wrote:
> 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().
Adding this without calling it leads to an unused function
warning in the build, I'm sure.
You could probably squash this into the next patch.
Reviewed-by: Alex Elder <elder@xxxxxxxxxx>
> Signed-off-by: Ilya Dryomov <ilya.dryomov@xxxxxxxxxxx>
> ---
> drivers/block/rbd.c | 53 +++++++++++++++++++++++++++++++++++++++++++++++++++
> 1 file changed, 53 insertions(+)
>
> diff --git a/drivers/block/rbd.c b/drivers/block/rbd.c
> index 20147aec86f3..02cf7aba7679 100644
> --- a/drivers/block/rbd.c
> +++ b/drivers/block/rbd.c
> @@ -2971,6 +2971,59 @@ static void rbd_watch_cb(u64 ver, u64 notify_id, u8 opcode, void *data)
> }
>
> /*
> + * 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)
>
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