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(I'm so sorry!) Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel os linux
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#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); }}
/* * io-wq may still hold a reference if the issue completed async. If so, the * last put completes the request, so that file drop and CQE visibility are * ordered. The last reference stays for the free path to put, a linked * timeout may still look at the request until then. */static inline bool io_req_complete_ready(struct io_kiocb *req){ if (!(req->flags & REQ_F_REFCOUNT) || (req->flags & REQ_F_REISSUE)) return true; if (atomic_read(&req->refs) == 1) return true; if (!req_ref_put_and_test(req)) return false; /* the other put raced us, ours was the last after all */ atomic_set(&req->refs, 1); return true;}
/* io-wq still holds a reference, the request can't be completed yet */static inline bool io_req_shared(struct io_kiocb *req){ if (!(req->flags & REQ_F_REFCOUNT) || (req->flags & REQ_F_REISSUE)) return false; return atomic_read(&req->refs) > 1;}
static inline void io_req_set_refcount(struct io_kiocb *req){ __io_req_set_refcount(req, 1);}#endif