linux-kernel - Re: [PATCH 1/2] split original if-condition code into separate ones

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Date:   Tue, 25 Sep 2018 20:40:57 +0800
From:   Coly Li <colyli@...e.de>
To:     Dongbo Cao <cdbdyx@....com>
Cc:     kent.overstreet@...il.com, linux-bcache@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] split original if-condition code into separate ones


On 9/25/18 2:09 PM, Dongbo Cao wrote:
> to make it clearly to debug.
>
> Signed-off-by: Dongbo Cao <cdbdyx@....com>

The patch added to my for-next, with minor changes to fix checkpatch.pl 
warnings.

Thanks.


Coly Li


> ---
>   drivers/md/bcache/super.c | 81 +++++++++++++++++++++++++++++++--------
>   1 file changed, 66 insertions(+), 15 deletions(-)
>
> diff --git a/drivers/md/bcache/super.c b/drivers/md/bcache/super.c
> index fa4058e4..0c0f6d8f 100644
> --- a/drivers/md/bcache/super.c
> +++ b/drivers/md/bcache/super.c
> @@ -2017,6 +2017,8 @@ static int cache_alloc(struct cache *ca)
>   	size_t free;
>   	size_t btree_buckets;
>   	struct bucket *b;
> +	int ret = -ENOMEM;
> +	const char *err = NULL;
>   
>   	__module_get(THIS_MODULE);
>   	kobject_init(&ca->kobj, &bch_cache_ktype);
> @@ -2034,27 +2036,76 @@ static int cache_alloc(struct cache *ca)
>   	 */
>   	btree_buckets = ca->sb.njournal_buckets ?: 8;
>   	free = roundup_pow_of_two(ca->sb.nbuckets) >> 10;
> -
> -	if (!init_fifo(&ca->free[RESERVE_BTREE], btree_buckets, GFP_KERNEL) ||
> -	    !init_fifo_exact(&ca->free[RESERVE_PRIO], prio_buckets(ca), GFP_KERNEL) ||
> -	    !init_fifo(&ca->free[RESERVE_MOVINGGC], free, GFP_KERNEL) ||
> -	    !init_fifo(&ca->free[RESERVE_NONE], free, GFP_KERNEL) ||
> -	    !init_fifo(&ca->free_inc,	free << 2, GFP_KERNEL) ||
> -	    !init_heap(&ca->heap,	free << 3, GFP_KERNEL) ||
> -	    !(ca->buckets	= vzalloc(array_size(sizeof(struct bucket),
> -						     ca->sb.nbuckets))) ||
> -	    !(ca->prio_buckets	= kzalloc(array3_size(sizeof(uint64_t),
> -						      prio_buckets(ca), 2),
> -					  GFP_KERNEL)) ||
> -	    !(ca->disk_buckets	= alloc_bucket_pages(GFP_KERNEL, ca)))
> -		return -ENOMEM;
> +	
> +	if (!init_fifo(&ca->free[RESERVE_BTREE], btree_buckets,
> +						GFP_KERNEL)) {
> +		err = "ca->free[RESERVE_BTREE] alloc failed";
> +		goto err_btree_alloc;
> +	}
> +	if (!init_fifo_exact(&ca->free[RESERVE_PRIO], prio_buckets(ca),
> +							GFP_KERNEL)) {
> +		err = "ca->free[RESERVE_PRIO] alloc failed";
> +		goto err_prio_alloc;
> +	}
> +	if (!init_fifo(&ca->free[RESERVE_MOVINGGC], free, GFP_KERNEL)) {
> +		err = "ca->free[RESERVE_MOVINGGC] alloc failed";
> +		goto err_movinggc_alloc;
> +	}
> +	if (!init_fifo(&ca->free[RESERVE_NONE], free, GFP_KERNEL)) {
> +		err = "ca->free[RESERVE_NONE] alloc failed";
> +		goto err_none_alloc;
> +	}
> +	if (!init_fifo(&ca->free_inc, free << 2, GFP_KERNEL)) {
> +		err = "ca->free_inc alloc failed";
> +		goto err_free_inc_alloc;
> +	}
> +	if (!init_heap(&ca->heap, free << 3, GFP_KERNEL)) {
> +		err = "ca->heap alloc failed";
> +		goto err_heap_alloc;
> +	}
> +	if (!(ca->buckets = vzalloc(array_size(sizeof(struct bucket),
> +						ca->sb.nbuckets)))) {
> +		err = "ca->buckets alloc failed";
> +		goto err_buckets_alloc;
> +	}
> +	if (!(ca->prio_buckets = kzalloc(array3_size(sizeof(uint64_t),
> +						prio_buckets(ca), 2),
> +							GFP_KERNEL))) {
> +		err = "ca->prio_buckets alloc failed";
> +		goto err_prio_buckets_alloc;
> +	}
> +	if (!(ca->disk_buckets = alloc_bucket_pages(GFP_KERNEL, ca))) {
> +		err = "ca->disk_buckets alloc failed";
> +		goto err_disk_buckets_alloc;
> +	}
>   
>   	ca->prio_last_buckets = ca->prio_buckets + prio_buckets(ca);
>   
>   	for_each_bucket(b, ca)
>   		atomic_set(&b->pin, 0);
> -
>   	return 0;
> +
> +err_disk_buckets_alloc:
> +	kfree(ca->prio_buckets);
> +err_prio_buckets_alloc:
> +	vfree(ca->buckets);
> +err_buckets_alloc:
> +	free_heap(&ca->heap);
> +err_heap_alloc:
> +	free_fifo(&ca->free_inc);
> +err_free_inc_alloc:
> +	free_fifo(&ca->free[RESERVE_NONE]);
> +err_none_alloc:
> +	free_fifo(&ca->free[RESERVE_MOVINGGC]);
> +err_movinggc_alloc:
> +	free_fifo(&ca->free[RESERVE_PRIO]);
> +err_prio_alloc:
> +	free_fifo(&ca->free[RESERVE_BTREE]);
> +err_btree_alloc:
> +	module_put(THIS_MODULE);
> +	if (err)
> +		pr_notice("error %s: %s", ca->cache_dev_name, err);
> +	return ret;
>   }
>   
>   static int register_cache(struct cache_sb *sb, struct page *sb_page,