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| author | Yan <yanzheng@21cn.com> | 2008-02-01 14:58:07 -0500 |
|---|---|---|
| committer | Chris Mason <chris.mason@oracle.com> | 2008-09-25 11:04:00 -0400 |
| commit | 2f375ab9c55bf22bf77ed9e3082b93e77ea10f55 (patch) | |
| tree | c51ceb5867351915e4466ecafbe88b8e8f575d89 /fs/btrfs/ctree.c | |
| parent | 60cde612c8eb51ba79dabb4088f149c6a9802fdf (diff) | |
| download | lwn-2f375ab9c55bf22bf77ed9e3082b93e77ea10f55.tar.gz lwn-2f375ab9c55bf22bf77ed9e3082b93e77ea10f55.zip | |
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>
Diffstat (limited to 'fs/btrfs/ctree.c')
| -rw-r--r-- | fs/btrfs/ctree.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/fs/btrfs/ctree.c b/fs/btrfs/ctree.c index cf32651876bf..ef8809c1e69c 100644 --- a/fs/btrfs/ctree.c +++ b/fs/btrfs/ctree.c @@ -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); |