Hello,
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.
Regards
YZ
---
diff -r e28d2b80d0f4 ctree.c
--- a/ctree.c Thu Jan 31 16:45:07 2008 -0500
+++ b/ctree.c Sat Feb 02 00:24:53 2008 +0800
@@ -720,6 +720,9 @@ static int balance_level(struct btrfs_tr
/* promote the child to a root */
child = read_node_slot(root, mid, 0);
BUG_ON(!child);
+ ret = btrfs_cow_block(trans, root, child, mid, 0, &child);
+ BUG_ON(ret);
+
root->node = child;
path->nodes[level] = NULL;
clean_tree_block(trans, root, mid);
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