f2fs_drop_nlink   843 fs/f2fs/dir.c  		f2fs_drop_nlink(dir, inode);
f2fs_drop_nlink  2984 fs/f2fs/f2fs.h void f2fs_drop_nlink(struct inode *dir, struct inode *inode);
f2fs_drop_nlink   635 fs/f2fs/inline.c 		f2fs_drop_nlink(dir, inode);