[PATCH] f2fs: Use nm_i->next_scan_nid as default for next_free_nid

[Huang Ying <ying.huang@intel.com>]

Now, if there is no free nid in nm_i->free_nid_list, 0 may be saved
into next_free_nid of checkpoint, this may cause useless scanning for
next mount.  nm_i->next_scan_nid should be a better default value than
0.

Signed-off-by: Huang, Ying <ying.huang@intel.com>
---
 fs/f2fs/checkpoint.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/fs/f2fs/checkpoint.c
+++ b/fs/f2fs/checkpoint.c
@@ -802,7 +802,8 @@ static void do_checkpoint(struct f2fs_sb
 {
 	struct f2fs_checkpoint *ckpt = F2FS_CKPT(sbi);
 	struct curseg_info *curseg = CURSEG_I(sbi, CURSEG_WARM_NODE);
-	nid_t last_nid = 0;
+	struct f2fs_nm_info *nm_i = NM_I(sbi);
+	nid_t last_nid = nm_i->next_scan_nid;
 	block_t start_blk;
 	struct page *cp_page;
 	unsigned int data_sum_blocks, orphan_blocks;

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