linux-kernel - Re: [PATCH 05/25] ubifs: implement ubifs_lpt_lookup using ubifs_pnode

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Date:   Mon, 13 Aug 2018 08:31:27 +0200
From:   Sascha Hauer <s.hauer@...gutronix.de>
To:     linux-mtd@...ts.infradead.org
Cc:     Richard Weinberger <richard@....at>,
        David Gstir <david@...ma-star.at>,
        linux-kernel@...r.kernel.org, kernel@...gutronix.de
Subject: Re: [PATCH 05/25] ubifs: implement ubifs_lpt_lookup using
 ubifs_pnode_lookup

On Wed, Jul 04, 2018 at 02:41:17PM +0200, Sascha Hauer wrote:
> ubifs_lpt_lookup() starts by looking up the nth pnode in the LPT. We
> already have this functionality in ubifs_pnode_lookup(). Use this
> function rather than open coding its functionality.
> 
> Signed-off-by: Sascha Hauer <s.hauer@...gutronix.de>
> ---
>  fs/ubifs/lpt.c | 20 ++------------------
>  1 file changed, 2 insertions(+), 18 deletions(-)
> 
> diff --git a/fs/ubifs/lpt.c b/fs/ubifs/lpt.c
> index 6cd6f23d4512..cde7b9484157 100644
> --- a/fs/ubifs/lpt.c
> +++ b/fs/ubifs/lpt.c
> @@ -1478,27 +1478,11 @@ struct ubifs_pnode *ubifs_pnode_lookup(struct ubifs_info *c, int i)
>   */
>  struct ubifs_lprops *ubifs_lpt_lookup(struct ubifs_info *c, int lnum)
>  {
> -	int err, i, h, iip, shft;
> -	struct ubifs_nnode *nnode;
> +	int i, iip;
>  	struct ubifs_pnode *pnode;
>  
> -	if (!c->nroot) {
> -		err = ubifs_read_nnode(c, NULL, 0);
> -		if (err)
> -			return ERR_PTR(err);
> -	}
> -	nnode = c->nroot;
>  	i = lnum - c->main_first;
> -	shft = c->lpt_hght * UBIFS_LPT_FANOUT_SHIFT;
> -	for (h = 1; h < c->lpt_hght; h++) {
> -		iip = ((i >> shft) & (UBIFS_LPT_FANOUT - 1));
> -		shft -= UBIFS_LPT_FANOUT_SHIFT;
> -		nnode = ubifs_get_nnode(c, nnode, iip);
> -		if (IS_ERR(nnode))
> -			return ERR_CAST(nnode);
> -	}
> -	iip = ((i >> shft) & (UBIFS_LPT_FANOUT - 1));
> -	pnode = ubifs_get_pnode(c, nnode, iip);
> +	pnode = ubifs_pnode_lookup(c, i);

This should be

	ubifs_pnode_lookup(c, i >> UBIFS_LPT_FANOUT_SHIFT);

Sascha

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