linux-kernel - Re: [PATCH] make iunique use a do/while loop rather than its obscure goto loop

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Message-ID: <20070623080804.GD28898@infradead.org>
Date:	Sat, 23 Jun 2007 09:08:04 +0100
From:	Christoph Hellwig <hch@...radead.org>
To:	Jeffrey Layton <jlayton@...hat.com>
Cc:	akpm@...ux-foundation.org, hch@...radead.org,
	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org
Subject: Re: [PATCH] make iunique use a do/while loop rather than its obscure goto loop

On Wed, Apr 11, 2007 at 05:58:56PM -0400, Jeffrey Layton wrote:
> A while back, Christoph mentioned that he thought that iunique ought to be
> cleaned up to use a more conventional loop construct. This patch does that,
> turning the strange goto loop into a do/while.
> 
> Signed-off-by: Jeff Layton <jlayton@...hat.com>
> 
> diff --git a/fs/inode.c b/fs/inode.c
> index 23fc1fd..90e7587 100644
> --- a/fs/inode.c
> +++ b/fs/inode.c
> @@ -689,21 +689,18 @@ ino_t iunique(struct super_block *sb, ino_t max_reserved)
>  	struct inode *inode;
>  	struct hlist_head * head;
>  	ino_t res;
> +
>  	spin_lock(&inode_lock);
> -retry:
> -	if (counter > max_reserved) {
> -		head = inode_hashtable + hash(sb,counter);
> +	do {
> +		if (counter <= max_reserved)
> +			counter = max_reserved + 1;
>  		res = counter++;
> +		head = inode_hashtable + hash(sb, res);
>  		inode = find_inode_fast(sb, head, res);
> -		if (!inode) {
> -			spin_unlock(&inode_lock);
> -			return res;
> -		}
> -	} else {
> -		counter = max_reserved + 1;
> -	}
> -	goto retry;
> -	
> +	} while (inode != NULL);
> +	spin_unlock(&inode_lock);
> +
> +	return res;
>  }
>  
>  EXPORT_SYMBOL(iunique);
---end quoted text---
-
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