From c04306471ad93f1daf60771a0373316d4c3494ae Mon Sep 17 00:00:00 2001 From: Alex Elder Date: Fri, 18 Jan 2013 12:31:09 -0600 Subject: [PATCH] rbd: don't retry setting up header watch When an rbd image is initially mapped a watch event is registered so we can do something if the header object changes. The code that does this currently loops if initiating the watch request results in an ERANGE error. The osds will never return ERANGE, so there's no reason to do this loop, so get rid of it. This resolves: http://tracker.newdream.net/issues/3860 Note that the problem this loop was intended to solve is a race between collecting image header information and setting up the watch on the header object. The real fix for that problem is described here: http://tracker.newdream.net/issues/3871 Signed-off-by: Alex Elder Reviewed-by: Josh Durgin --- drivers/block/rbd.c | 23 ++++------------------- 1 file changed, 4 insertions(+), 19 deletions(-) diff --git a/drivers/block/rbd.c b/drivers/block/rbd.c index 58d01e3a0fce..668936381ab0 100644 --- a/drivers/block/rbd.c +++ b/drivers/block/rbd.c @@ -1474,6 +1474,9 @@ static int rbd_req_sync_watch(struct rbd_device *rbd_dev, int start) struct ceph_osd_req_op *op; int ret = 0; + rbd_assert(start ^ !!rbd_dev->watch_event); + rbd_assert(start ^ !!rbd_dev->watch_request); + if (start) { struct ceph_osd_client *osdc; @@ -1482,8 +1485,6 @@ static int rbd_req_sync_watch(struct rbd_device *rbd_dev, int start) &rbd_dev->watch_event); if (ret < 0) return ret; - } else { - rbd_assert(rbd_dev->watch_request != NULL); } op = rbd_osd_req_op_create(CEPH_OSD_OP_WATCH, @@ -3023,22 +3024,6 @@ static void rbd_bus_del_dev(struct rbd_device *rbd_dev) device_unregister(&rbd_dev->dev); } -static int rbd_init_watch_dev(struct rbd_device *rbd_dev) -{ - int ret, rc; - - do { - ret = rbd_req_sync_watch(rbd_dev, 1); - if (ret == -ERANGE) { - rc = rbd_dev_refresh(rbd_dev, NULL); - if (rc < 0) - return rc; - } - } while (ret == -ERANGE); - - return ret; -} - static atomic64_t rbd_dev_id_max = ATOMIC64_INIT(0); /* @@ -3584,7 +3569,7 @@ static int rbd_dev_probe_finish(struct rbd_device *rbd_dev) if (ret) goto err_out_bus; - ret = rbd_init_watch_dev(rbd_dev); + ret = rbd_req_sync_watch(rbd_dev, 1); if (ret) goto err_out_bus; -- 2.39.5