Call btrfs_cow_block while lowering tree level.
When freeing root block of a tree, btrfs_free_extent' parameter 'ref_generation' is from root block itseft. When freeing non-root block, 'ref_generation' is from its parent. so when converting a non-root block to root block, we must guarantee its generation is equal to its parent's generation. Signed-off-by: Chris Mason <chris.mason@oracle.com>
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@ -720,6 +720,9 @@ static int balance_level(struct btrfs_trans_handle *trans,
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/* promote the child to a root */
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child = read_node_slot(root, mid, 0);
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BUG_ON(!child);
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ret = btrfs_cow_block(trans, root, child, mid, 0, &child);
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BUG_ON(ret);
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root->node = child;
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path->nodes[level] = NULL;
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clean_tree_block(trans, root, mid);
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