Re: [PATCH v2] f2fs: fix race condition in between free nid allocator/initializer

[Jaegeuk Kim <jaegeuk@kernel.org>]

Hi Chao,

On 03/21, Chao Yu wrote:
> In below concurrent case, allocated nid can be loaded into free nid cache
> and be allocated again.
> 
> Thread A				Thread B
> - f2fs_create
>  - f2fs_new_inode
>   - alloc_nid
>    - __insert_nid_to_list(ALLOC_NID_LIST)
> 					- f2fs_balance_fs_bg
> 					 - build_free_nids
> 					  - __build_free_nids
> 					   - scan_nat_page
> 					    - add_free_nid
> 					     - __lookup_nat_cache
>  - f2fs_add_link
>   - init_inode_metadata
>    - new_inode_page
>     - new_node_page
>      - set_node_addr
>  - alloc_nid_done
>   - __remove_nid_from_list(ALLOC_NID_LIST)
> 					     - __insert_nid_to_list(FREE_NID_LIST)
> 
> This patch uses build_lock covering free nid allocation and initialization
> to avoid this race condition.

I have a concern about mutex contention.
How about this?

---
 fs/f2fs/node.c | 60 ++++++++++++++++++++++++++++++++++++++++------------------
 1 file changed, 42 insertions(+), 18 deletions(-)

diff --git a/fs/f2fs/node.c b/fs/f2fs/node.c
index 347aa30ef0cf..25bc47087f91 100644
--- a/fs/f2fs/node.c
+++ b/fs/f2fs/node.c
@@ -1759,40 +1759,64 @@ static void __remove_nid_from_list(struct f2fs_sb_info *sbi,
 static bool add_free_nid(struct f2fs_sb_info *sbi, nid_t nid, bool build)
 {
 	struct f2fs_nm_info *nm_i = NM_I(sbi);
-	struct free_nid *i;
+	struct free_nid *i, *e;
 	struct nat_entry *ne;
-	int err;
+	int err = -EINVAL;
+	bool ret = false;
 
 	/* 0 nid should not be used */
 	if (unlikely(nid == 0))
 		return false;
 
-	if (build) {
-		/* do not add allocated nids */
-		ne = __lookup_nat_cache(nm_i, nid);
-		if (ne && (!get_nat_flag(ne, IS_CHECKPOINTED) ||
-				nat_get_blkaddr(ne) != NULL_ADDR))
-			return false;
-	}
-
 	i = f2fs_kmem_cache_alloc(free_nid_slab, GFP_NOFS);
 	i->nid = nid;
 	i->state = NID_NEW;
 
-	if (radix_tree_preload(GFP_NOFS)) {
-		kmem_cache_free(free_nid_slab, i);
-		return true;
-	}
+	if (radix_tree_preload(GFP_NOFS))
+		goto err;
 
 	spin_lock(&nm_i->nid_list_lock);
+
+	if (build) {
+		/*
+		 *   Thread A             Thread B
+		 *  - f2fs_create
+		 *   - f2fs_new_inode
+		 *    - alloc_nid
+		 *     - __insert_nid_to_list(ALLOC_NID_LIST)
+		 *                     - f2fs_balance_fs_bg
+		 *                      - build_free_nids
+		 *                       - __build_free_nids
+		 *                        - scan_nat_page
+		 *                         - add_free_nid
+		 *                          - __lookup_nat_cache
+		 *  - f2fs_add_link
+		 *   - init_inode_metadata
+		 *    - new_inode_page
+		 *     - new_node_page
+		 *      - set_node_addr
+		 *  - alloc_nid_done
+		 *   - __remove_nid_from_list(ALLOC_NID_LIST)
+		 *                         - __insert_nid_to_list(FREE_NID_LIST)
+		 */
+		ne = __lookup_nat_cache(nm_i, nid);
+		if (ne && (!get_nat_flag(ne, IS_CHECKPOINTED) ||
+				nat_get_blkaddr(ne) != NULL_ADDR))
+			goto err_out;
+
+		e = __lookup_free_nid_list(nm_i, nid);
+		if (e && e->state == NID_ALLOC)
+			goto err_out;
+	}
+	ret = true;
 	err = __insert_nid_to_list(sbi, i, FREE_NID_LIST, true);
+err_out:
 	spin_unlock(&nm_i->nid_list_lock);
 	radix_tree_preload_end();
-	if (err) {
+err:
+	if (err)
 		kmem_cache_free(free_nid_slab, i);
-		return true;
-	}
-	return true;
+	return ret;
 }
 
 static void remove_free_nid(struct f2fs_sb_info *sbi, nid_t nid)
-- 
2.11.0


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