f2fs: avoid to drop nat entries due to the negative nr_shrink

The try_to_free_nats should not receive the negative nr_shrink.
Otherwise, it can drop all the nat entries by the while loop.

Signed-off-by: Jaegeuk Kim <jaegeuk.kim@samsung.com>

diff --git a/fs/f2fs/node.c b/fs/f2fs/node.c
index 9a6d8bbf0bd73281ed10bf99b4812ae1492e482f..d27e65a1fb0bf585b4d6ff1fb0891e6e732dc87a 100644 (file)
--- a/fs/f2fs/node.c
+++ b/fs/f2fs/node.c
@@ -208,7 +208,7 @@ int try_to_free_nats(struct f2fs_sb_info *sbi, int nr_shrink)
 {
        struct f2fs_nm_info *nm_i = NM_I(sbi);
 
-       if (nm_i->nat_cnt <= NM_WOUT_THRESHOLD)
+       if (nm_i->nat_cnt <= NM_WOUT_THRESHOLD || nr_shrink <= 0)
                return 0;
 
        write_lock(&nm_i->nat_tree_lock);