linux-kernel - Re: [patch] ceph: tidy ceph_mdsmap

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Date:	Wed, 29 May 2013 09:17:21 +0200
From:	walter harms <wharms@....de>
To:	Dan Carpenter <dan.carpenter@...cle.com>
CC:	Sage Weil <sage@...tank.com>, ceph-devel@...r.kernel.org,
	linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org,
	Emil Goode <emilgoode@...il.com>
Subject: Re: [patch] ceph: tidy ceph_mdsmap_decode() a little



Am 29.05.2013 08:22, schrieb Dan Carpenter:
> I introduced a new temporary variable "info" instead of
> "m->m_info[mds]".  Also I reversed the if condition and pulled
> everything in one indent level.
> 
> Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>
> ---
> This goes on top of Emil Goode's patch.
> 
> diff --git a/fs/ceph/mdsmap.c b/fs/ceph/mdsmap.c
> index d4d3897..132b64e 100644
> --- a/fs/ceph/mdsmap.c
> +++ b/fs/ceph/mdsmap.c
> @@ -92,6 +92,7 @@ struct ceph_mdsmap *ceph_mdsmap_decode(void **p, void *end)
>  		u32 num_export_targets;
>  		void *pexport_targets = NULL;
>  		struct ceph_timespec laggy_since;
> +		struct ceph_mds_info *info;
>  
>  		ceph_decode_need(p, end, sizeof(u64)*2 + 1 + sizeof(u32), bad);
>  		global_id = ceph_decode_64(p);
> @@ -126,26 +127,27 @@ struct ceph_mdsmap *ceph_mdsmap_decode(void **p, void *end)
>  		     i+1, n, global_id, mds, inc,
>  		     ceph_pr_addr(&addr.in_addr),
>  		     ceph_mds_state_name(state));
> -		if (mds >= 0 && mds < m->m_max_mds && state > 0) {
> -			m->m_info[mds].global_id = global_id;
> -			m->m_info[mds].state = state;
> -			m->m_info[mds].addr = addr;
> -			m->m_info[mds].laggy =
> -				(laggy_since.tv_sec != 0 ||
> -				 laggy_since.tv_nsec != 0);
> -			m->m_info[mds].num_export_targets = num_export_targets;
> -			if (num_export_targets) {
> -				m->m_info[mds].export_targets =
> -					kcalloc(num_export_targets, sizeof(u32),
> -						GFP_NOFS);
> -				if (m->m_info[mds].export_targets == NULL)
> -					goto badmem;
> -				for (j = 0; j < num_export_targets; j++)
> -					m->m_info[mds].export_targets[j] =
> -					       ceph_decode_32(&pexport_targets);
> -			} else {
> -				m->m_info[mds].export_targets = NULL;
> -			}
> +
> +		if (mds < 0 || mds >= m->m_max_mds || state <= 0)
> +			continue;
> +
> +		info = &m->m_info[mds];
> +		info->global_id = global_id;
> +		info->state = state;
> +		info->addr = addr;
> +		info->laggy = (laggy_since.tv_sec != 0 ||
> +			       laggy_since.tv_nsec != 0);
> +		info->num_export_targets = num_export_targets;
personally i would go for:
		info->export_targets = NULL;
and remove the else below.

hope that helps,

re,
 wh

> +		if (num_export_targets) {
> +			info->export_targets = kcalloc(num_export_targets,
> +						       sizeof(u32), GFP_NOFS);
> +			if (info->export_targets == NULL)
> +				goto badmem;
> +			for (j = 0; j < num_export_targets; j++)
> +				info->export_targets[j] =
> +				       ceph_decode_32(&pexport_targets);
> +		} else {
> +			info->export_targets = NULL;
>  		}
>  	}
>  
> --
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