BTRFS_PERSISTENT_ITEM_KEY
[BTRFS_PERSISTENT_ITEM_KEY] = "PERSISTENT_ITEM",
case BTRFS_PERSISTENT_ITEM_KEY:
key.type = BTRFS_PERSISTENT_ITEM_KEY;
key.type = BTRFS_PERSISTENT_ITEM_KEY;
key.type = BTRFS_PERSISTENT_ITEM_KEY;