forked from luck/tmp_suning_uos_patched
io_uring: add io_kiocb ref count
We'll use this for the POLL implementation. Regular requests will NOT be using references, so initialize it to 0. Any real use of the io_kiocb ref will initialize it to at least 2. Reviewed-by: Hannes Reinecke <hare@suse.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Jens Axboe <axboe@kernel.dk>
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c16361c1d8
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@ -184,6 +184,7 @@ struct io_kiocb {
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struct io_ring_ctx *ctx;
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struct list_head list;
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unsigned int flags;
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refcount_t refs;
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#define REQ_F_FORCE_NONBLOCK 1 /* inline submission attempt */
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#define REQ_F_IOPOLL_COMPLETED 2 /* polled IO has completed */
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#define REQ_F_FIXED_FILE 4 /* ctx owns file */
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@ -377,6 +378,7 @@ static struct io_kiocb *io_get_req(struct io_ring_ctx *ctx,
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req->ctx = ctx;
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req->flags = 0;
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refcount_set(&req->refs, 0);
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return req;
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out:
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io_ring_drop_ctx_refs(ctx, 1);
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@ -394,8 +396,10 @@ static void io_free_req_many(struct io_ring_ctx *ctx, void **reqs, int *nr)
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static void io_free_req(struct io_kiocb *req)
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{
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io_ring_drop_ctx_refs(req->ctx, 1);
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kmem_cache_free(req_cachep, req);
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if (!refcount_read(&req->refs) || refcount_dec_and_test(&req->refs)) {
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io_ring_drop_ctx_refs(req->ctx, 1);
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kmem_cache_free(req_cachep, req);
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}
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}
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/*
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