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Date: Mon, 6 Jan 2014 14:39:04 -0800 From: Greg Kroah-Hartman <gregkh@...uxfoundation.org> To: linux-kernel@...r.kernel.org Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, stable@...r.kernel.org, Josh Durgin <josh.durgin@...tank.com>, Alex Elder <elder@...aro.org> Subject: [PATCH 3.10 115/129] rbd: make rbd_obj_notify_ack() synchronous 3.10-stable review patch. If anyone has any objections, please let me know. ------------------ From: Josh Durgin <josh.durgin@...tank.com> commit 20e0af67ce88c657d0601977b9941a2256afbdaa upstream. The only user of rbd_obj_notify_ack() is rbd_watch_cb(). It used asynchronously with no tracking of when the notify ack completes, so it may still be in progress when the osd_client is shut down. This results in a BUG() since the osd client assumes no requests are in flight when it stops. Since all notifies are flushed before the osd_client is stopped, waiting for the notify ack to complete before returning from the watch callback ensures there are no notify acks in flight during shutdown. Rename rbd_obj_notify_ack() to rbd_obj_notify_ack_sync() to reflect its new synchronous nature. Signed-off-by: Josh Durgin <josh.durgin@...tank.com> Reviewed-by: Alex Elder <elder@...aro.org> Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org> --- drivers/block/rbd.c | 11 ++++++----- 1 file changed, 6 insertions(+), 5 deletions(-) --- a/drivers/block/rbd.c +++ b/drivers/block/rbd.c @@ -2819,7 +2819,7 @@ out_err: obj_request_done_set(obj_request); } -static int rbd_obj_notify_ack(struct rbd_device *rbd_dev, u64 notify_id) +static int rbd_obj_notify_ack_sync(struct rbd_device *rbd_dev, u64 notify_id) { struct rbd_obj_request *obj_request; struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; @@ -2834,16 +2834,17 @@ static int rbd_obj_notify_ack(struct rbd obj_request->osd_req = rbd_osd_req_create(rbd_dev, false, obj_request); if (!obj_request->osd_req) goto out; - obj_request->callback = rbd_obj_request_put; osd_req_op_watch_init(obj_request->osd_req, 0, CEPH_OSD_OP_NOTIFY_ACK, notify_id, 0, 0); rbd_osd_req_format_read(obj_request); ret = rbd_obj_request_submit(osdc, obj_request); -out: if (ret) - rbd_obj_request_put(obj_request); + goto out; + ret = rbd_obj_request_wait(obj_request); +out: + rbd_obj_request_put(obj_request); return ret; } @@ -2863,7 +2864,7 @@ static void rbd_watch_cb(u64 ver, u64 no if (ret) rbd_warn(rbd_dev, ": header refresh error (%d)\n", ret); - rbd_obj_notify_ack(rbd_dev, notify_id); + rbd_obj_notify_ack_sync(rbd_dev, notify_id); } /* -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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