nbd: fix how we set bd_invalidated

bd_invalidated is kind of a pain wrt partitions as it really only
triggers the partition rescan if it is set after bd_ops->open() runs, so
setting it when we reset the device isn't useful.  We also sporadically
would still have partitions left over in some disconnect cases, so fix
this by always setting bd_invalidated on open if there's no
configuration or if we've had a disconnect action happen, that way the
partition table gets invalidated and rescanned properly.

Signed-off-by: Josef Bacik <jbacik@fb.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

diff --git a/drivers/block/nbd.c b/drivers/block/nbd.c
index 06725ce..24788bd 100644 (file)
--- a/drivers/block/nbd.c
+++ b/drivers/block/nbd.c
@@ -964,10 +964,6 @@ static void nbd_bdev_reset(struct block_device *bdev)
        if (bdev->bd_openers > 1)
                return;
        bd_set_size(bdev, 0);
-       if (max_part > 0) {
-               blkdev_reread_part(bdev);
-               bdev->bd_invalidated = 1;
-       }
 }
 
 static void nbd_parse_flags(struct nbd_device *nbd)
@@ -1282,6 +1278,9 @@ static int nbd_open(struct block_device *bdev, fmode_t mode)
                refcount_set(&nbd->config_refs, 1);
                refcount_inc(&nbd->refs);
                mutex_unlock(&nbd->config_lock);
+               bdev->bd_invalidated = 1;
+       } else if (nbd_disconnected(nbd->config)) {
+               bdev->bd_invalidated = 1;
        }
 out:
        mutex_unlock(&nbd_index_mutex);