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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>
hifive-unleashed-5.1
Yan 2008-02-01 14:58:07 -05:00 committed by Chris Mason
parent 60cde612c8
commit 2f375ab9c5
1 changed files with 3 additions and 0 deletions
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3
fs/btrfs/ctree.c
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@ -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);