linux-kernel - Re: [PATCH 3/7] f2fs: rename free nid cache operation

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Message-ID: <20161011171903.GB82199@jaegeuk>
Date:   Tue, 11 Oct 2016 10:19:03 -0700
From:   Jaegeuk Kim <jaegeuk@...nel.org>
To:     Chao Yu <chao@...nel.org>
Cc:     linux-f2fs-devel@...ts.sourceforge.net,
        linux-kernel@...r.kernel.org, Chao Yu <yuchao0@...wei.com>
Subject: Re: [PATCH 3/7] f2fs: rename free nid cache operation

Hi Chao,

On Tue, Oct 11, 2016 at 10:31:32PM +0800, Chao Yu wrote:
> From: Chao Yu <yuchao0@...wei.com>
> 
> Rename free nid cache operation for readability, no functionality change.

Well, I don't think this can be a *cache*, since there is no cache-related
operations such as reordering by cache hit, whereas it is more likely to
be a singled one-way list.

Thanks,

> 
> Signed-off-by: Chao Yu <yuchao0@...wei.com>
> ---
>  fs/f2fs/node.c | 28 +++++++++++++++++-----------
>  1 file changed, 17 insertions(+), 11 deletions(-)
> 
> diff --git a/fs/f2fs/node.c b/fs/f2fs/node.c
> index ea9ff8c..92c9aa4 100644
> --- a/fs/f2fs/node.c
> +++ b/fs/f2fs/node.c
> @@ -1689,13 +1689,19 @@ const struct address_space_operations f2fs_node_aops = {
>  #endif
>  };
>  
> -static struct free_nid *__lookup_free_nid_list(struct f2fs_nm_info *nm_i,
> +static struct free_nid *__lookup_free_nid_cache(struct f2fs_nm_info *nm_i,
>  						nid_t n)
>  {
>  	return radix_tree_lookup(&nm_i->free_nid_root, n);
>  }
>  
> -static void __del_from_free_nid_list(struct f2fs_nm_info *nm_i,
> +static int __insert_to_free_nid_cache(struct f2fs_nm_info *nm_i,
> +						struct free_nid *i)
> +{
> +	return radix_tree_insert(&nm_i->free_nid_root, i->nid, i);
> +}
> +
> +static void __del_from_free_nid_cache(struct f2fs_nm_info *nm_i,
>  						struct free_nid *i)
>  {
>  	radix_tree_delete(&nm_i->free_nid_root, i->nid);
> @@ -1763,7 +1769,7 @@ static int add_free_nid(struct f2fs_sb_info *sbi, nid_t nid, bool build)
>  	}
>  
>  	spin_lock(&nm_i->free_nid_list_lock);
> -	if (radix_tree_insert(&nm_i->free_nid_root, i->nid, i)) {
> +	if (__insert_to_free_nid_cache(nm_i, i)) {
>  		spin_unlock(&nm_i->free_nid_list_lock);
>  		radix_tree_preload_end();
>  		kmem_cache_free(free_nid_slab, i);
> @@ -1782,10 +1788,10 @@ static void remove_free_nid(struct f2fs_sb_info *sbi, nid_t nid)
>  	bool need_free = false;
>  
>  	spin_lock(&nm_i->free_nid_list_lock);
> -	i = __lookup_free_nid_list(nm_i, nid);
> +	i = __lookup_free_nid_cache(nm_i, nid);
>  	if (i && i->state == NID_NEW) {
>  		__remove_nid_from_list(sbi, i, FREE_NID_LIST);
> -		__del_from_free_nid_list(nm_i, i);
> +		__del_from_free_nid_cache(nm_i, i);
>  		need_free = true;
>  	}
>  	spin_unlock(&nm_i->free_nid_list_lock);
> @@ -1922,10 +1928,10 @@ void alloc_nid_done(struct f2fs_sb_info *sbi, nid_t nid)
>  	struct free_nid *i;
>  
>  	spin_lock(&nm_i->free_nid_list_lock);
> -	i = __lookup_free_nid_list(nm_i, nid);
> +	i = __lookup_free_nid_cache(nm_i, nid);
>  	f2fs_bug_on(sbi, !i);
>  	__remove_nid_from_list(sbi, i, ALLOC_NID_LIST);
> -	__del_from_free_nid_list(nm_i, i);
> +	__del_from_free_nid_cache(nm_i, i);
>  	spin_unlock(&nm_i->free_nid_list_lock);
>  
>  	kmem_cache_free(free_nid_slab, i);
> @@ -1944,13 +1950,13 @@ void alloc_nid_failed(struct f2fs_sb_info *sbi, nid_t nid)
>  		return;
>  
>  	spin_lock(&nm_i->free_nid_list_lock);
> -	i = __lookup_free_nid_list(nm_i, nid);
> +	i = __lookup_free_nid_cache(nm_i, nid);
>  	f2fs_bug_on(sbi, !i);
>  
>  	__remove_nid_from_list(sbi, i, ALLOC_NID_LIST);
>  
>  	if (!available_free_memory(sbi, FREE_NIDS)) {
> -		__del_from_free_nid_list(nm_i, i);
> +		__del_from_free_nid_cache(nm_i, i);
>  		need_free = true;
>  	} else {
>  		i->state = NID_NEW;
> @@ -1980,7 +1986,7 @@ int try_to_free_nids(struct f2fs_sb_info *sbi, int nr_shrink)
>  			break;
>  
>  		__remove_nid_from_list(sbi, i, FREE_NID_LIST);
> -		__del_from_free_nid_list(nm_i, i);
> +		__del_from_free_nid_cache(nm_i, i);
>  
>  		kmem_cache_free(free_nid_slab, i);
>  		nr_shrink--;
> @@ -2368,7 +2374,7 @@ void destroy_node_manager(struct f2fs_sb_info *sbi)
>  	spin_lock(&nm_i->free_nid_list_lock);
>  	list_for_each_entry_safe(i, next_i, &nm_i->free_nid_list, list) {
>  		__remove_nid_from_list(sbi, i, FREE_NID_LIST);
> -		__del_from_free_nid_list(nm_i, i);
> +		__del_from_free_nid_cache(nm_i, i);
>  		spin_unlock(&nm_i->free_nid_list_lock);
>  		kmem_cache_free(free_nid_slab, i);
>  		spin_lock(&nm_i->free_nid_list_lock);
> -- 
> 2.10.1