On Tue, Jan 07, 2014 at 05:25:19PM +0800, Wang Shilong wrote:
> --- a/fs/btrfs/transaction.c
> +++ b/fs/btrfs/transaction.c
> @@ -1971,6 +1971,19 @@ int btrfs_clean_one_deleted_snapshot(struct btrfs_root *root)
> }
> root = list_first_entry(&fs_info->dead_roots,
> struct btrfs_root, root_list);
You're pulling the root from dead_roots here ...
> + /*
> + * Make sure root is not involved in send,
... and there's no way to send such a thing.
> + * if we fail with first root, we return
> + * directly rather than continue.
> + */
> + spin_lock(&root->root_item_lock);
> + if (root->send_in_progress) {
> + spin_unlock(&fs_info->trans_lock);
> + spin_unlock(&root->root_item_lock);
> + return 0;
> + }
> + spin_unlock(&root->root_item_lock);
> +
> list_del_init(&root->root_list);
> spin_unlock(&fs_info->trans_lock);
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