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

From: Jaegeuk Kim
Date: Tue Oct 11 2016 - 13:26:59 EST


Hi Chao,

On Tue, Oct 11, 2016 at 10:31:32PM +0800, Chao Yu wrote:
> From: Chao Yu <yuchao0@xxxxxxxxxx>
>
> 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@xxxxxxxxxx>
> ---
> 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