Bio flags

Hi, I am porting some of file system related code from 3.0.101 kernel to 4.4.13 kernel and found that the number of bio flags have been reduced from 13 to 8 and some of the which been removed are : BIO_UPTODATE BIO_RW_BLOCK BIO_EOF BIO_EOPNOTSUPP ... I was unable to find much in the documentation sections regarding the flags. Can someone please help providing inputs or pointers over this change. Thank you for your help. Regards, ~Praveen.