On 10/23/2012 09:55 PM, Jan Schmidt wrote:
> In get_old_root we grab a lock on the extent buffer before we obtain a
> reference on that buffer. That order is changed now.
>
Reviewed-by: Liu Bo <bo.li....@oracle.com>
thanks,
liubo
> Signed-off-by: Jan Schmidt <list.bt...@jan-o-sch.net>
> ---
> fs/btrfs/ctree.c | 2 +-
> 1 files changed, 1 insertions(+), 1 deletions(-)
>
> diff --git a/fs/btrfs/ctree.c b/fs/btrfs/ctree.c
> index 7093ff5..bed06e8 100644
> --- a/fs/btrfs/ctree.c
> +++ b/fs/btrfs/ctree.c
> @@ -1274,6 +1274,7 @@ get_old_root(struct btrfs_root *root, u64 time_seq)
> free_extent_buffer(root->node);
> if (!eb)
> return NULL;
> + extent_buffer_get(eb);
> btrfs_tree_read_lock(eb);
> if (old_root) {
> btrfs_set_header_bytenr(eb, eb->start);
> @@ -1286,7 +1287,6 @@ get_old_root(struct btrfs_root *root, u64 time_seq)
> __tree_mod_log_rewind(eb, time_seq, tm);
> else
> WARN_ON(btrfs_header_level(eb) != 0);
> - extent_buffer_get(eb);
> WARN_ON(btrfs_header_nritems(eb) > BTRFS_NODEPTRS_PER_BLOCK(root));
>
> return eb;
>
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