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f39130004d
Since commit 8f6c829491fe ("io_uring: remove struct io_tw_state::locked"),
io_req_complete_post() is only called from io-wq submit work, where the
request reference is guaranteed to be grabbed and won't drop to zero
in io_req_complete_post().
Kill the dead code, meantime add req_ref_put() to put the reference.
Cc: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Ming Lei <ming.lei@redhat.com>
Reviewed-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/1d8297e2046553153e763a52574f0e0f4d512f86.1712331455.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
56 lines
1.3 KiB
C
56 lines
1.3 KiB
C
#ifndef IOU_REQ_REF_H
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#define IOU_REQ_REF_H
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#include <linux/atomic.h>
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#include <linux/io_uring_types.h>
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/*
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* Shamelessly stolen from the mm implementation of page reference checking,
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* see commit f958d7b528b1 for details.
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*/
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#define req_ref_zero_or_close_to_overflow(req) \
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((unsigned int) atomic_read(&(req->refs)) + 127u <= 127u)
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static inline bool req_ref_inc_not_zero(struct io_kiocb *req)
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{
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WARN_ON_ONCE(!(req->flags & REQ_F_REFCOUNT));
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return atomic_inc_not_zero(&req->refs);
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}
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static inline bool req_ref_put_and_test(struct io_kiocb *req)
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{
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if (likely(!(req->flags & REQ_F_REFCOUNT)))
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return true;
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WARN_ON_ONCE(req_ref_zero_or_close_to_overflow(req));
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return atomic_dec_and_test(&req->refs);
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}
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static inline void req_ref_get(struct io_kiocb *req)
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{
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WARN_ON_ONCE(!(req->flags & REQ_F_REFCOUNT));
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WARN_ON_ONCE(req_ref_zero_or_close_to_overflow(req));
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atomic_inc(&req->refs);
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}
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static inline void req_ref_put(struct io_kiocb *req)
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{
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WARN_ON_ONCE(!(req->flags & REQ_F_REFCOUNT));
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WARN_ON_ONCE(req_ref_zero_or_close_to_overflow(req));
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atomic_dec(&req->refs);
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}
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static inline void __io_req_set_refcount(struct io_kiocb *req, int nr)
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{
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if (!(req->flags & REQ_F_REFCOUNT)) {
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req->flags |= REQ_F_REFCOUNT;
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atomic_set(&req->refs, nr);
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}
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}
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static inline void io_req_set_refcount(struct io_kiocb *req)
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{
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__io_req_set_refcount(req, 1);
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}
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#endif
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