rbd: warn on update_snaps failure on notify

Signed-off-by: Sage Weil <sage@newdream.net>

diff --git a/drivers/block/rbd.c b/drivers/block/rbd.c
index 9712fad..78d0011 100644 (file)
--- a/drivers/block/rbd.c
+++ b/drivers/block/rbd.c
@@ -1191,14 +1191,19 @@ static int rbd_req_sync_notify_ack(struct rbd_device *dev,
 static void rbd_watch_cb(u64 ver, u64 notify_id, u8 opcode, void *data)
 {
        struct rbd_device *dev = (struct rbd_device *)data;
+       int rc;
+
        if (!dev)
                return;
 
        dout("rbd_watch_cb %s notify_id=%lld opcode=%d\n", dev->obj_md_name,
                notify_id, (int)opcode);
        mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING);
-       __rbd_update_snaps(dev);
+       rc = __rbd_update_snaps(dev);
        mutex_unlock(&ctl_mutex);
+       if (rc)
+               pr_warning(DRV_NAME "%d got notification but failed to update"
+                          " snaps: %d\n", dev->major, rc);
 
        rbd_req_sync_notify_ack(dev, ver, notify_id, dev->obj_md_name);
 }