linux-kernel - Re: [PATCH 6/8] fs/ext3: use rbtree postorder iteration helper instead of opencoding

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Message-ID: <20131104142638.GD8566@quack.suse.cz>
Date:	Mon, 4 Nov 2013 15:26:38 +0100
From:	Jan Kara <jack@...e.cz>
To:	Cody P Schafer <cody@...ux.vnet.ibm.com>
Cc:	Andreas Dilger <adilger.kernel@...ger.ca>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Jan Kara <jack@...e.cz>, linux-ext4@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 6/8] fs/ext3: use rbtree postorder iteration helper
 instead of opencoding

On Fri 01-11-13 15:38:50, Cody P Schafer wrote:
> Use rbtree_postorder_for_each_entry_safe() to destroy the rbtree instead
> of opencoding an alternate postorder iteration that modifies the tree
  Thanks. I've merged the patch into my tree.

								Honza

> Signed-off-by: Cody P Schafer <cody@...ux.vnet.ibm.com>
> ---
>  fs/ext3/dir.c | 36 +++++-------------------------------
>  1 file changed, 5 insertions(+), 31 deletions(-)
> 
> diff --git a/fs/ext3/dir.c b/fs/ext3/dir.c
> index bafdd48..a331ad1 100644
> --- a/fs/ext3/dir.c
> +++ b/fs/ext3/dir.c
> @@ -309,43 +309,17 @@ struct fname {
>   */
>  static void free_rb_tree_fname(struct rb_root *root)
>  {
> -	struct rb_node	*n = root->rb_node;
> -	struct rb_node	*parent;
> -	struct fname	*fname;
> -
> -	while (n) {
> -		/* Do the node's children first */
> -		if (n->rb_left) {
> -			n = n->rb_left;
> -			continue;
> -		}
> -		if (n->rb_right) {
> -			n = n->rb_right;
> -			continue;
> -		}
> -		/*
> -		 * The node has no children; free it, and then zero
> -		 * out parent's link to it.  Finally go to the
> -		 * beginning of the loop and try to free the parent
> -		 * node.
> -		 */
> -		parent = rb_parent(n);
> -		fname = rb_entry(n, struct fname, rb_hash);
> +	struct fname *fname, *next;
> +
> +	rbtree_postorder_for_each_entry_safe(fname, next, root, rb_hash)
>  		while (fname) {
>  			struct fname * old = fname;
>  			fname = fname->next;
>  			kfree (old);
>  		}
> -		if (!parent)
> -			*root = RB_ROOT;
> -		else if (parent->rb_left == n)
> -			parent->rb_left = NULL;
> -		else if (parent->rb_right == n)
> -			parent->rb_right = NULL;
> -		n = parent;
> -	}
> -}
>  
> +	*root = RB_ROOT;
> +}
>  
>  static struct dir_private_info *ext3_htree_create_dir_info(struct file *filp,
>  							   loff_t pos)
> -- 
> 1.8.4.2
> 
-- 
Jan Kara <jack@...e.cz>
SUSE Labs, CR
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