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Commit 2f375ab9 authored by Yan's avatar Yan Committed by Chris Mason
Browse files

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: default avatarChris Mason <chris.mason@oracle.com>
parent 60cde612

fs/btrfs/ctree.c

+3 −0
Original line number Diff line number Diff line
@@ -720,6 +720,9 @@ static int balance_level(struct btrfs_trans_handle *trans, 
		/* 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);