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Date:   Mon, 30 Oct 2017 02:30:26 -0700
From:   Jaegeuk Kim <jaegeuk@...nel.org>
To:     Chao Yu <chao@...nel.org>
Cc:     Fan Li <fanofcode.li@...sung.com>, 'Chao Yu' <yuchao0@...wei.com>,
        linux-kernel@...r.kernel.org,
        linux-f2fs-devel@...ts.sourceforge.net
Subject: Re: [f2fs-dev] [PATCH] f2fs: add a function to move nid

On 10/28, Chao Yu wrote:
> On 2017/10/28 19:03, Fan Li wrote:
> > This patch add a new function to move nid from one state to another.
> > Move operation is heavily used, by adding a new function for it 
> > we can cut down some branches from several flow.
> > 
> > 
> > Signed-off-by: Fan li <fanofcode.li@...sung.com>
> > ---
> >  fs/f2fs/node.c | 51 ++++++++++++++++++++++++++++++---------------------
> >  1 file changed, 30 insertions(+), 21 deletions(-)
> > 
> > diff --git a/fs/f2fs/node.c b/fs/f2fs/node.c
> > index ac629d6..8116b50
> > --- a/fs/f2fs/node.c
> > +++ b/fs/f2fs/node.c
> > @@ -1763,15 +1763,13 @@ static struct free_nid *__lookup_free_nid_list(struct f2fs_nm_info *nm_i,
> >  }
> >  
> >  static int __insert_free_nid(struct f2fs_sb_info *sbi,
> > -			struct free_nid *i, enum nid_state state, bool new)
> > +			struct free_nid *i, enum nid_state state)
> >  {
> >  	struct f2fs_nm_info *nm_i = NM_I(sbi);
> >  
> > -	if (new) {
> > -		int err = radix_tree_insert(&nm_i->free_nid_root, i->nid, i);
> > -		if (err)
> > -			return err;
> > -	}
> > +	int err = radix_tree_insert(&nm_i->free_nid_root, i->nid, i);
> > +	if (err)
> > +		return err;
> >  
> >  	f2fs_bug_on(sbi, state != i->state);
> >  	nm_i->nid_cnt[state]++;
> > @@ -1781,7 +1779,7 @@ static int __insert_free_nid(struct f2fs_sb_info *sbi,
> >  }
> >  
> >  static void __remove_free_nid(struct f2fs_sb_info *sbi,
> > -			struct free_nid *i, enum nid_state state, bool reuse)
> > +			struct free_nid *i, enum nid_state state)
> >  {
> >  	struct f2fs_nm_info *nm_i = NM_I(sbi);
> >  
> > @@ -1789,8 +1787,23 @@ static void __remove_free_nid(struct f2fs_sb_info *sbi,
> >  	nm_i->nid_cnt[state]--;
> >  	if (state == FREE_NID)
> >  		list_del(&i->list);
> > -	if (!reuse)
> > -		radix_tree_delete(&nm_i->free_nid_root, i->nid);
> > +	radix_tree_delete(&nm_i->free_nid_root, i->nid);
> > +}
> > +
> > +static void __move_free_nid(struct f2fs_sb_info *sbi, struct free_nid *i,
> > +			enum nid_state org_state, enum nid_state dst_state)
> > +{
> > +	struct f2fs_nm_info *nm_i = NM_I(sbi);
> > +
> > +	f2fs_bug_on(sbi, org_state != i->state);
> > +	i->state = dst_state;
> > +	nm_i->nid_cnt[org_state]--;
> > +	nm_i->nid_cnt[dst_state]++;
> > +
> > +	if (org_state == FREE_NID)
> 
> Welcome back to community, Fan. :)
> 
> Minor, how about "if (dst_stat == PREALLOC_NID)" ?

How about this?

switch (dst_state) {
	case PREALLOC_NID:
		list_del(&i->list);
		break;
	case FREE_NID:
		list_add_tail(&i->list, &nm_i->free_nid_list);
		break;
	default:
		BUG_ON(1);
};

> 
> Otherwise this patch looks good to me, anyway, you can add:
> 
> Reviewed-by: Chao Yu <yuchao0@...wei.com>
> 
> Thanks,
> 
> > +		list_del(&i->list);
> > +	else if (dst_state == FREE_NID)
> > +		list_add_tail(&i->list, &nm_i->free_nid_list);
> >  }
> >  
> >  /* return if the nid is recognized as free */
> > @@ -1850,7 +1863,7 @@ static bool add_free_nid(struct f2fs_sb_info *sbi, nid_t nid, bool build)
> >  		}
> >  	}
> >  	ret = true;
> > -	err = __insert_free_nid(sbi, i, FREE_NID, true);
> > +	err = __insert_free_nid(sbi, i, FREE_NID);
> >  err_out:
> >  	spin_unlock(&nm_i->nid_list_lock);
> >  	radix_tree_preload_end();
> > @@ -1869,7 +1882,7 @@ static void remove_free_nid(struct f2fs_sb_info *sbi, nid_t nid)
> >  	spin_lock(&nm_i->nid_list_lock);
> >  	i = __lookup_free_nid_list(nm_i, nid);
> >  	if (i && i->state == FREE_NID) {
> > -		__remove_free_nid(sbi, i, FREE_NID, false);
> > +		__remove_free_nid(sbi, i, FREE_NID);
> >  		need_free = true;
> >  	}
> >  	spin_unlock(&nm_i->nid_list_lock);
> > @@ -2080,9 +2093,7 @@ bool alloc_nid(struct f2fs_sb_info *sbi, nid_t *nid)
> >  					struct free_nid, list);
> >  		*nid = i->nid;
> >  
> > -		__remove_free_nid(sbi, i, FREE_NID, true);
> > -		i->state = PREALLOC_NID;
> > -		__insert_free_nid(sbi, i, PREALLOC_NID, false);
> > +		__move_free_nid(sbi, i, FREE_NID, PREALLOC_NID);
> >  		nm_i->available_nids--;
> >  
> >  		update_free_nid_bitmap(sbi, *nid, false, false);
> > @@ -2108,7 +2119,7 @@ void alloc_nid_done(struct f2fs_sb_info *sbi, nid_t nid)
> >  	spin_lock(&nm_i->nid_list_lock);
> >  	i = __lookup_free_nid_list(nm_i, nid);
> >  	f2fs_bug_on(sbi, !i);
> > -	__remove_free_nid(sbi, i, PREALLOC_NID, false);
> > +	__remove_free_nid(sbi, i, PREALLOC_NID);
> >  	spin_unlock(&nm_i->nid_list_lock);
> >  
> >  	kmem_cache_free(free_nid_slab, i);
> > @@ -2131,12 +2142,10 @@ void alloc_nid_failed(struct f2fs_sb_info *sbi, nid_t nid)
> >  	f2fs_bug_on(sbi, !i);
> >  
> >  	if (!available_free_memory(sbi, FREE_NIDS)) {
> > -		__remove_free_nid(sbi, i, PREALLOC_NID, false);
> > +		__remove_free_nid(sbi, i, PREALLOC_NID);
> >  		need_free = true;
> >  	} else {
> > -		__remove_free_nid(sbi, i, PREALLOC_NID, true);
> > -		i->state = FREE_NID;
> > -		__insert_free_nid(sbi, i, FREE_NID, false);
> > +		__move_free_nid(sbi, i, PREALLOC_NID, FREE_NID);
> >  	}
> >  
> >  	nm_i->available_nids++;
> > @@ -2167,7 +2176,7 @@ int try_to_free_nids(struct f2fs_sb_info *sbi, int nr_shrink)
> >  				nm_i->nid_cnt[FREE_NID] <= MAX_FREE_NIDS)
> >  			break;
> >  
> > -		__remove_free_nid(sbi, i, FREE_NID, false);
> > +		__remove_free_nid(sbi, i, FREE_NID);
> >  		kmem_cache_free(free_nid_slab, i);
> >  		nr_shrink--;
> >  	}
> > @@ -2746,7 +2755,7 @@ void destroy_node_manager(struct f2fs_sb_info *sbi)
> >  	/* destroy free nid list */
> >  	spin_lock(&nm_i->nid_list_lock);
> >  	list_for_each_entry_safe(i, next_i, &nm_i->free_nid_list, list) {
> > -		__remove_free_nid(sbi, i, FREE_NID, false);
> > +		__remove_free_nid(sbi, i, FREE_NID);
> >  		spin_unlock(&nm_i->nid_list_lock);
> >  		kmem_cache_free(free_nid_slab, i);
> >  		spin_lock(&nm_i->nid_list_lock);
> > 

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