f2fs: check nid == 0 in add_free_nid

It is more obvious that add_free_nid checks whether the free nid is zero or not.

Reviewed-by: Namjae Jeon <namjae.jeon@samsung.com>
Signed-off-by: Jaegeuk Kim <jaegeuk.kim@samsung.com>

diff --git a/fs/f2fs/node.c b/fs/f2fs/node.c
index a0aa0446a23789917f113a736876a55d77ed872a..c8f48d436487cbbafcde27f97e1467d44d1270ca 100644 (file)
--- a/fs/f2fs/node.c
+++ b/fs/f2fs/node.c
@@ -1245,6 +1245,10 @@ static int add_free_nid(struct f2fs_nm_info *nm_i, nid_t nid)
 
        if (nm_i->fcnt > 2 * MAX_FREE_NIDS)
                return 0;
+
+       /* 0 nid should not be used */
+       if (nid == 0)
+               return 0;
 retry:
        i = kmem_cache_alloc(free_nid_slab, GFP_NOFS);
        if (!i) {
@@ -1286,10 +1290,6 @@ static int scan_nat_page(struct f2fs_nm_info *nm_i,
        int fcnt = 0;
        int i;
 
-       /* 0 nid should not be used */
-       if (start_nid == 0)
-               ++start_nid;
-
        i = start_nid % NAT_ENTRY_PER_BLOCK;
 
        for (; i < NAT_ENTRY_PER_BLOCK; i++, start_nid++) {