/* SPDX-License-Identifier: GPL-2.0 */#ifndef IOU_REQ_REF_H#define IOU_REQ_REF_H #include <linux/atomic.h>#include <linux/io_uring_types.h> /* * Shamelessly stolen from the mm implementation of page reference checking, * see commit f958d7b528b1 for details. */#define req_ref_zero_or_close_to_overflow(req)	\	((unsigned int) atomic_read(&(req->refs)) + 127u <= 127u) static inline bool req_ref_inc_not_zero(struct io_kiocb *req){	WARN_ON_ONCE(!(req->flags & REQ_F_REFCOUNT));	return atomic_inc_not_zero(&req->refs);} static inline bool req_ref_put_and_test_atomic(struct io_kiocb *req){	WARN_ON_ONCE(!(data_race(req->flags) & REQ_F_REFCOUNT));	WARN_ON_ONCE(req_ref_zero_or_close_to_overflow(req));	return atomic_dec_and_test(&req->refs);} static inline bool req_ref_put_and_test(struct io_kiocb *req){	if (likely(!(req->flags & REQ_F_REFCOUNT)))		return true; 	WARN_ON_ONCE(req_ref_zero_or_close_to_overflow(req));	return atomic_dec_and_test(&req->refs);} static inline void req_ref_get(struct io_kiocb *req){	WARN_ON_ONCE(!(req->flags & REQ_F_REFCOUNT));	WARN_ON_ONCE(req_ref_zero_or_close_to_overflow(req));	atomic_inc(&req->refs);} static inline void req_ref_put(struct io_kiocb *req){	WARN_ON_ONCE(!(req->flags & REQ_F_REFCOUNT));	WARN_ON_ONCE(req_ref_zero_or_close_to_overflow(req));	atomic_dec(&req->refs);} static inline void __io_req_set_refcount(struct io_kiocb *req, int nr){	if (!(req->flags & REQ_F_REFCOUNT)) {		req->flags |= REQ_F_REFCOUNT;		atomic_set(&req->refs, nr);	}} static inline void io_req_set_refcount(struct io_kiocb *req){	__io_req_set_refcount(req, 1);}#endif