[PATCH 1/8] f2fs: reuse nid if it was cached only

[Jaegeuk Kim]

If nid's block address is assigned as:
 NULL_ADDR -> NEW_ADDR -> NULL_ADDR, we can reset this nid, since its node page
has never written back.

Signed-off-by: Jaegeuk Kim <jaeg...@kernel.org>
---
 fs/f2fs/node.c | 14 ++++++++++----
 1 file changed, 10 insertions(+), 4 deletions(-)

diff --git a/fs/f2fs/node.c b/fs/f2fs/node.c
index 16532b3..15f55ae 100644
--- a/fs/f2fs/node.c
+++ b/fs/f2fs/node.c
@@ -317,10 +317,16 @@ static void set_node_addr(struct f2fs_sb_info *sbi, 
struct node_info *ni,
        }
 
        /* change address */
-       nat_set_blkaddr(e, new_blkaddr);
-       if (new_blkaddr == NEW_ADDR || new_blkaddr == NULL_ADDR)
-               set_nat_flag(e, IS_CHECKPOINTED, false);
-       __set_nat_cache_dirty(nm_i, e);
+       if (nat_get_blkaddr(e) == NEW_ADDR && new_blkaddr == NULL_ADDR) {
+               nat_set_blkaddr(e, new_blkaddr);
+               nat_reset_flag(e);
+               __clear_nat_cache_dirty(nm_i, e);
+       } else {
+               nat_set_blkaddr(e, new_blkaddr);
+               if (new_blkaddr == NEW_ADDR || new_blkaddr == NULL_ADDR)
+                       set_nat_flag(e, IS_CHECKPOINTED, false);
+               __set_nat_cache_dirty(nm_i, e);
+       }
 
        /* update fsync_mark if its inode nat entry is still alive */
        if (ni->nid != ni->ino)
-- 
2.6.3