[Ocfs2-devel] [PATCH 07/10] ocfs2: Determine an extent tree's max_leaf_clusters in an et_op.

[TaoMa <tao.ma@oracle.com>]

Joel Becker wrote:
> Provide an optional extent_tree_operation to specify the
> max_leaf_clusters of an ocfs2_extent_tree.  If not provided, the value
> is 0 (unlimited).
>
> Signed-off-by: Joel Becker <joel.becker@oracle.com>
> ---
>  fs/ocfs2/alloc.c |   18 +++++++++++++++---
>  1 files changed, 15 insertions(+), 3 deletions(-)
>
> diff --git a/fs/ocfs2/alloc.c b/fs/ocfs2/alloc.c
> index 0b900f6..7c0721d 100644
> --- a/fs/ocfs2/alloc.c
> +++ b/fs/ocfs2/alloc.c
> @@ -76,6 +76,8 @@ struct ocfs2_extent_tree_operations {
>  	/* These are internal to ocfs2_extent_tree and don't have
>  	 * accessor functions */
>  	void (*eo_fill_root_el)(struct ocfs2_extent_tree *et);
> +	void (*eo_fill_max_leaf_clusters)(struct inode *inode,
> +					  struct ocfs2_extent_tree *et);
>  };
>  
>  struct ocfs2_extent_tree {
> @@ -205,6 +207,14 @@ static void ocfs2_xattr_tree_fill_root_el(struct ocfs2_extent_tree *et)
>  	et->et_root_el = &xb->xb_attrs.xb_root.xt_list;
>  }
>  
> +static void ocfs2_xattr_tree_fill_max_leaf_clusters(struct inode *inode,
> +						    struct ocfs2_extent_tree *et)
> +{
> +	et->et_max_leaf_clusters =
> +		ocfs2_clusters_for_bytes(inode->i_sb,
> +					 OCFS2_MAX_XATTR_TREE_LEAF_SIZE);
> +}
> +
>  static void ocfs2_xattr_tree_set_last_eb_blk(struct ocfs2_extent_tree *et,
>  					     u64 blkno)
>  {
> @@ -243,6 +253,7 @@ static struct ocfs2_extent_tree_operations ocfs2_xattr_tree_et_ops = {
>  	.eo_update_clusters	= ocfs2_xattr_tree_update_clusters,
>  	.eo_sanity_check	= ocfs2_xattr_tree_sanity_check,
>  	.eo_fill_root_el	= ocfs2_xattr_tree_fill_root_el,
> +	.eo_fill_max_leaf_clusters = ocfs2_xattr_tree_fill_max_leaf_clusters,
>  };
>  
>  static void ocfs2_get_extent_tree(struct ocfs2_extent_tree *et,
> @@ -254,7 +265,6 @@ static void ocfs2_get_extent_tree(struct ocfs2_extent_tree *et,
>  	et->et_type = et_type;
>  	get_bh(bh);
>  	et->et_root_bh = bh;
> -	et->et_max_leaf_clusters = 0;
>  	if (!obj)
>  		obj = (void *)bh->b_data;
>  	et->et_object = obj;
> @@ -265,11 +275,13 @@ static void ocfs2_get_extent_tree(struct ocfs2_extent_tree *et,
>  		et->et_ops = &ocfs2_xattr_et_ops;
>  	} else if (et_type == OCFS2_XATTR_TREE_EXTENT) {
>  		et->et_ops = &ocfs2_xattr_tree_et_ops;
> -		et->et_max_leaf_clusters = ocfs2_clusters_for_bytes(inode->i_sb,
> -						OCFS2_MAX_XATTR_TREE_LEAF_SIZE);
>  	}
>  
>  	et->et_ops->eo_fill_root_el(et);
> +	if (!et->et_ops->eo_fill_max_leaf_clusters)
> +		et->et_max_leaf_clusters = 0;
> +	else
> +		et->et_ops->eo_fill_max_leaf_clusters(inode, et);
>  }
>   
Like what you have done in patch 1/10, maybe we can add a small wrapper 
named ocfs2_et_fill_max_leaf_clusters for this?

Regards,
Tao