mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-29 15:43:59 +08:00
io_uring: don't propagate io_comp_state
There is no reason to drag io_comp_state into opcode handlers, we just need a flag and the actual work will be done in __io_queue_sqe(). Signed-off-by: Pavel Begunkov <asml.silence@gmail.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Pavel Begunkov
Jens Axboe
parent
61e9820304
commit
889fca7328
164
fs/io_uring.c
164
fs/io_uring.c
@ -189,6 +189,7 @@ struct io_rings {
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enum io_uring_cmd_flags {
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IO_URING_F_NONBLOCK = 1,
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IO_URING_F_COMPLETE_DEFER = 2,
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};
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struct io_mapped_ubuf {
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@ -1018,7 +1019,7 @@ static void init_fixed_file_ref_node(struct io_ring_ctx *ctx,
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struct fixed_rsrc_ref_node *ref_node);
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static void __io_complete_rw(struct io_kiocb *req, long res, long res2,
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struct io_comp_state *cs);
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unsigned int issue_flags);
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static void io_cqring_fill_event(struct io_kiocb *req, long res);
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static void io_put_req(struct io_kiocb *req);
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static void io_put_req_deferred(struct io_kiocb *req, int nr);
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@ -1957,7 +1958,7 @@ static void io_submit_flush_completions(struct io_comp_state *cs)
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}
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static void io_req_complete_state(struct io_kiocb *req, long res,
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unsigned int cflags, struct io_comp_state *cs)
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unsigned int cflags)
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{
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io_clean_op(req);
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req->result = res;
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@ -1965,18 +1966,18 @@ static void io_req_complete_state(struct io_kiocb *req, long res,
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req->flags |= REQ_F_COMPLETE_INLINE;
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}
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static inline void __io_req_complete(struct io_kiocb *req, long res,
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unsigned cflags, struct io_comp_state *cs)
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static inline void __io_req_complete(struct io_kiocb *req, unsigned issue_flags,
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long res, unsigned cflags)
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{
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if (!cs)
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io_req_complete_nostate(req, res, cflags);
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if (issue_flags & IO_URING_F_COMPLETE_DEFER)
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io_req_complete_state(req, res, cflags);
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else
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io_req_complete_state(req, res, cflags, cs);
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io_req_complete_nostate(req, res, cflags);
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}
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static inline void io_req_complete(struct io_kiocb *req, long res)
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{
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__io_req_complete(req, res, 0, NULL);
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__io_req_complete(req, 0, res, 0);
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}
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static inline bool io_is_fallback_req(struct io_kiocb *req)
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@ -2449,7 +2450,7 @@ static void io_iopoll_queue(struct list_head *again)
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do {
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req = list_first_entry(again, struct io_kiocb, inflight_entry);
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list_del(&req->inflight_entry);
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__io_complete_rw(req, -EAGAIN, 0, NULL);
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__io_complete_rw(req, -EAGAIN, 0, 0);
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} while (!list_empty(again));
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}
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@ -2662,7 +2663,7 @@ static void kiocb_end_write(struct io_kiocb *req)
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}
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static void io_complete_rw_common(struct kiocb *kiocb, long res,
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struct io_comp_state *cs)
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unsigned int issue_flags)
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{
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struct io_kiocb *req = container_of(kiocb, struct io_kiocb, rw.kiocb);
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int cflags = 0;
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@ -2674,7 +2675,7 @@ static void io_complete_rw_common(struct kiocb *kiocb, long res,
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req_set_fail_links(req);
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if (req->flags & REQ_F_BUFFER_SELECTED)
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cflags = io_put_rw_kbuf(req);
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__io_req_complete(req, res, cflags, cs);
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__io_req_complete(req, issue_flags, res, cflags);
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}
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#ifdef CONFIG_BLOCK
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@ -2741,17 +2742,17 @@ static bool io_rw_reissue(struct io_kiocb *req, long res)
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}
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static void __io_complete_rw(struct io_kiocb *req, long res, long res2,
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struct io_comp_state *cs)
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unsigned int issue_flags)
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{
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if (!io_rw_reissue(req, res))
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io_complete_rw_common(&req->rw.kiocb, res, cs);
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io_complete_rw_common(&req->rw.kiocb, res, issue_flags);
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}
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static void io_complete_rw(struct kiocb *kiocb, long res, long res2)
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{
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struct io_kiocb *req = container_of(kiocb, struct io_kiocb, rw.kiocb);
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__io_complete_rw(req, res, res2, NULL);
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__io_complete_rw(req, res, res2, 0);
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}
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static void io_complete_rw_iopoll(struct kiocb *kiocb, long res, long res2)
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@ -2970,7 +2971,7 @@ static inline void io_rw_done(struct kiocb *kiocb, ssize_t ret)
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}
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static void kiocb_done(struct kiocb *kiocb, ssize_t ret,
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struct io_comp_state *cs)
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unsigned int issue_flags)
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{
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struct io_kiocb *req = container_of(kiocb, struct io_kiocb, rw.kiocb);
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struct io_async_rw *io = req->async_data;
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@ -2986,7 +2987,7 @@ static void kiocb_done(struct kiocb *kiocb, ssize_t ret,
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if (req->flags & REQ_F_CUR_POS)
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req->file->f_pos = kiocb->ki_pos;
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if (ret >= 0 && kiocb->ki_complete == io_complete_rw)
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__io_complete_rw(req, ret, 0, cs);
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__io_complete_rw(req, ret, 0, issue_flags);
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else
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io_rw_done(kiocb, ret);
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}
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@ -3481,8 +3482,7 @@ static int io_iter_do_read(struct io_kiocb *req, struct iov_iter *iter)
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return -EINVAL;
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}
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static int io_read(struct io_kiocb *req, unsigned int issue_flags,
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struct io_comp_state *cs)
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static int io_read(struct io_kiocb *req, unsigned int issue_flags)
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{
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struct iovec inline_vecs[UIO_FASTIOV], *iovec = inline_vecs;
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struct kiocb *kiocb = &req->rw.kiocb;
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@ -3572,7 +3572,7 @@ static int io_read(struct io_kiocb *req, unsigned int issue_flags,
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/* we got some bytes, but not all. retry. */
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} while (ret > 0 && ret < io_size);
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done:
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kiocb_done(kiocb, ret, cs);
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kiocb_done(kiocb, ret, issue_flags);
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return 0;
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}
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@ -3593,8 +3593,7 @@ static int io_write_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
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return io_rw_prep_async(req, WRITE);
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}
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static int io_write(struct io_kiocb *req, unsigned int issue_flags,
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struct io_comp_state *cs)
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static int io_write(struct io_kiocb *req, unsigned int issue_flags)
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{
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struct iovec inline_vecs[UIO_FASTIOV], *iovec = inline_vecs;
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struct kiocb *kiocb = &req->rw.kiocb;
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@ -3668,7 +3667,7 @@ static int io_write(struct io_kiocb *req, unsigned int issue_flags,
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if ((req->ctx->flags & IORING_SETUP_IOPOLL) && ret2 == -EAGAIN)
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goto copy_iov;
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done:
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kiocb_done(kiocb, ret2, cs);
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kiocb_done(kiocb, ret2, issue_flags);
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} else {
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copy_iov:
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/* some cases will consume bytes even on error returns */
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@ -3917,15 +3916,14 @@ static int io_splice(struct io_kiocb *req, unsigned int issue_flags)
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/*
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* IORING_OP_NOP just posts a completion event, nothing else.
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*/
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static int io_nop(struct io_kiocb *req, unsigned int issue_flags,
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struct io_comp_state *cs)
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static int io_nop(struct io_kiocb *req, unsigned int issue_flags)
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{
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struct io_ring_ctx *ctx = req->ctx;
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if (unlikely(ctx->flags & IORING_SETUP_IOPOLL))
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return -EINVAL;
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__io_req_complete(req, 0, 0, cs);
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__io_req_complete(req, issue_flags, 0, 0);
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return 0;
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}
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@ -4166,8 +4164,7 @@ static int __io_remove_buffers(struct io_ring_ctx *ctx, struct io_buffer *buf,
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return i;
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}
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static int io_remove_buffers(struct io_kiocb *req, unsigned int issue_flags,
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struct io_comp_state *cs)
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static int io_remove_buffers(struct io_kiocb *req, unsigned int issue_flags)
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{
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struct io_provide_buf *p = &req->pbuf;
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struct io_ring_ctx *ctx = req->ctx;
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@ -4188,11 +4185,11 @@ static int io_remove_buffers(struct io_kiocb *req, unsigned int issue_flags,
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/* need to hold the lock to complete IOPOLL requests */
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if (ctx->flags & IORING_SETUP_IOPOLL) {
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__io_req_complete(req, ret, 0, cs);
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__io_req_complete(req, issue_flags, ret, 0);
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io_ring_submit_unlock(ctx, !force_nonblock);
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} else {
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io_ring_submit_unlock(ctx, !force_nonblock);
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__io_req_complete(req, ret, 0, cs);
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__io_req_complete(req, issue_flags, ret, 0);
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}
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return 0;
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}
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@ -4251,8 +4248,7 @@ static int io_add_buffers(struct io_provide_buf *pbuf, struct io_buffer **head)
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return i ? i : -ENOMEM;
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}
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static int io_provide_buffers(struct io_kiocb *req, unsigned int issue_flags,
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struct io_comp_state *cs)
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static int io_provide_buffers(struct io_kiocb *req, unsigned int issue_flags)
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{
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struct io_provide_buf *p = &req->pbuf;
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struct io_ring_ctx *ctx = req->ctx;
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@ -4284,11 +4280,11 @@ out:
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/* need to hold the lock to complete IOPOLL requests */
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if (ctx->flags & IORING_SETUP_IOPOLL) {
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__io_req_complete(req, ret, 0, cs);
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__io_req_complete(req, issue_flags, ret, 0);
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io_ring_submit_unlock(ctx, !force_nonblock);
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} else {
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io_ring_submit_unlock(ctx, !force_nonblock);
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__io_req_complete(req, ret, 0, cs);
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__io_req_complete(req, issue_flags, ret, 0);
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}
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return 0;
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}
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@ -4320,8 +4316,7 @@ static int io_epoll_ctl_prep(struct io_kiocb *req,
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#endif
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}
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static int io_epoll_ctl(struct io_kiocb *req, unsigned int issue_flags,
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struct io_comp_state *cs)
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static int io_epoll_ctl(struct io_kiocb *req, unsigned int issue_flags)
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{
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#if defined(CONFIG_EPOLL)
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struct io_epoll *ie = &req->epoll;
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@ -4334,7 +4329,7 @@ static int io_epoll_ctl(struct io_kiocb *req, unsigned int issue_flags,
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if (ret < 0)
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req_set_fail_links(req);
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__io_req_complete(req, ret, 0, cs);
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__io_req_complete(req, issue_flags, ret, 0);
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return 0;
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#else
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return -EOPNOTSUPP;
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@ -4466,8 +4461,7 @@ static int io_close_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
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return 0;
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}
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static int io_close(struct io_kiocb *req, unsigned int issue_flags,
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struct io_comp_state *cs)
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static int io_close(struct io_kiocb *req, unsigned int issue_flags)
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{
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struct files_struct *files = current->files;
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struct io_close *close = &req->close;
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@ -4516,7 +4510,7 @@ err:
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req_set_fail_links(req);
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if (file)
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fput(file);
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__io_req_complete(req, ret, 0, cs);
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__io_req_complete(req, issue_flags, ret, 0);
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return 0;
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}
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@ -4612,8 +4606,7 @@ static int io_sendmsg_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
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return ret;
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}
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static int io_sendmsg(struct io_kiocb *req, unsigned int issue_flags,
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struct io_comp_state *cs)
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static int io_sendmsg(struct io_kiocb *req, unsigned int issue_flags)
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{
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struct io_async_msghdr iomsg, *kmsg;
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struct socket *sock;
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@ -4650,12 +4643,11 @@ static int io_sendmsg(struct io_kiocb *req, unsigned int issue_flags,
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req->flags &= ~REQ_F_NEED_CLEANUP;
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if (ret < 0)
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req_set_fail_links(req);
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__io_req_complete(req, ret, 0, cs);
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__io_req_complete(req, issue_flags, ret, 0);
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return 0;
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}
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static int io_send(struct io_kiocb *req, unsigned int issue_flags,
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struct io_comp_state *cs)
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static int io_send(struct io_kiocb *req, unsigned int issue_flags)
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{
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struct io_sr_msg *sr = &req->sr_msg;
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struct msghdr msg;
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@ -4692,7 +4684,7 @@ static int io_send(struct io_kiocb *req, unsigned int issue_flags,
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if (ret < 0)
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req_set_fail_links(req);
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__io_req_complete(req, ret, 0, cs);
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__io_req_complete(req, issue_flags, ret, 0);
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return 0;
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}
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@ -4833,8 +4825,7 @@ static int io_recvmsg_prep(struct io_kiocb *req,
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return ret;
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}
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static int io_recvmsg(struct io_kiocb *req, unsigned int issue_flags,
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struct io_comp_state *cs)
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static int io_recvmsg(struct io_kiocb *req, unsigned int issue_flags)
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{
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struct io_async_msghdr iomsg, *kmsg;
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struct socket *sock;
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@ -4886,12 +4877,11 @@ static int io_recvmsg(struct io_kiocb *req, unsigned int issue_flags,
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req->flags &= ~REQ_F_NEED_CLEANUP;
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if (ret < 0)
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req_set_fail_links(req);
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__io_req_complete(req, ret, cflags, cs);
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__io_req_complete(req, issue_flags, ret, cflags);
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return 0;
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}
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static int io_recv(struct io_kiocb *req, unsigned int issue_flags,
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struct io_comp_state *cs)
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static int io_recv(struct io_kiocb *req, unsigned int issue_flags)
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{
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struct io_buffer *kbuf;
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struct io_sr_msg *sr = &req->sr_msg;
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@ -4941,7 +4931,7 @@ out_free:
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cflags = io_put_recv_kbuf(req);
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if (ret < 0)
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req_set_fail_links(req);
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__io_req_complete(req, ret, cflags, cs);
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__io_req_complete(req, issue_flags, ret, cflags);
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return 0;
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}
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@ -4961,8 +4951,7 @@ static int io_accept_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
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return 0;
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}
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static int io_accept(struct io_kiocb *req, unsigned int issue_flags,
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struct io_comp_state *cs)
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static int io_accept(struct io_kiocb *req, unsigned int issue_flags)
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{
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struct io_accept *accept = &req->accept;
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bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK;
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@ -4982,7 +4971,7 @@ static int io_accept(struct io_kiocb *req, unsigned int issue_flags,
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ret = -EINTR;
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req_set_fail_links(req);
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}
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__io_req_complete(req, ret, 0, cs);
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__io_req_complete(req, issue_flags, ret, 0);
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return 0;
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}
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@ -5006,8 +4995,7 @@ static int io_connect_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
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&io->address);
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}
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static int io_connect(struct io_kiocb *req, unsigned int issue_flags,
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struct io_comp_state *cs)
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static int io_connect(struct io_kiocb *req, unsigned int issue_flags)
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{
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struct io_async_connect __io, *io;
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unsigned file_flags;
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@ -5045,7 +5033,7 @@ static int io_connect(struct io_kiocb *req, unsigned int issue_flags,
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out:
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if (ret < 0)
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req_set_fail_links(req);
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__io_req_complete(req, ret, 0, cs);
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__io_req_complete(req, issue_flags, ret, 0);
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return 0;
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}
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#else /* !CONFIG_NET */
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@ -5054,14 +5042,12 @@ static int io_sendmsg_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
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return -EOPNOTSUPP;
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}
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static int io_sendmsg(struct io_kiocb *req, unsigned int issue_flags,
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struct io_comp_state *cs)
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static int io_sendmsg(struct io_kiocb *req, unsigned int issue_flags)
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{
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return -EOPNOTSUPP;
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}
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static int io_send(struct io_kiocb *req, unsigned int issue_flags,
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struct io_comp_state *cs)
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static int io_send(struct io_kiocb *req, unsigned int issue_flags)
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{
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return -EOPNOTSUPP;
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}
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@ -5072,14 +5058,12 @@ static int io_recvmsg_prep(struct io_kiocb *req,
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return -EOPNOTSUPP;
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}
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static int io_recvmsg(struct io_kiocb *req, unsigned int issue_flags,
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struct io_comp_state *cs)
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static int io_recvmsg(struct io_kiocb *req, unsigned int issue_flags)
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{
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return -EOPNOTSUPP;
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}
|
||||
|
||||
static int io_recv(struct io_kiocb *req, unsigned int issue_flags,
|
||||
struct io_comp_state *cs)
|
||||
static int io_recv(struct io_kiocb *req, unsigned int issue_flags)
|
||||
{
|
||||
return -EOPNOTSUPP;
|
||||
}
|
||||
@ -5089,8 +5073,7 @@ static int io_accept_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
|
||||
return -EOPNOTSUPP;
|
||||
}
|
||||
|
||||
static int io_accept(struct io_kiocb *req, unsigned int issue_flags,
|
||||
struct io_comp_state *cs)
|
||||
static int io_accept(struct io_kiocb *req, unsigned int issue_flags)
|
||||
{
|
||||
return -EOPNOTSUPP;
|
||||
}
|
||||
@ -5100,8 +5083,7 @@ static int io_connect_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
|
||||
return -EOPNOTSUPP;
|
||||
}
|
||||
|
||||
static int io_connect(struct io_kiocb *req, unsigned int issue_flags,
|
||||
struct io_comp_state *cs)
|
||||
static int io_connect(struct io_kiocb *req, unsigned int issue_flags)
|
||||
{
|
||||
return -EOPNOTSUPP;
|
||||
}
|
||||
@ -5978,8 +5960,7 @@ static int io_rsrc_update_prep(struct io_kiocb *req,
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int io_files_update(struct io_kiocb *req, unsigned int issue_flags,
|
||||
struct io_comp_state *cs)
|
||||
static int io_files_update(struct io_kiocb *req, unsigned int issue_flags)
|
||||
{
|
||||
struct io_ring_ctx *ctx = req->ctx;
|
||||
struct io_uring_rsrc_update up;
|
||||
@ -5997,7 +5978,7 @@ static int io_files_update(struct io_kiocb *req, unsigned int issue_flags,
|
||||
|
||||
if (ret < 0)
|
||||
req_set_fail_links(req);
|
||||
__io_req_complete(req, ret, 0, cs);
|
||||
__io_req_complete(req, issue_flags, ret, 0);
|
||||
return 0;
|
||||
}
|
||||
|
||||
@ -6204,25 +6185,24 @@ static void __io_clean_op(struct io_kiocb *req)
|
||||
}
|
||||
}
|
||||
|
||||
static int io_issue_sqe(struct io_kiocb *req, unsigned int issue_flags,
|
||||
struct io_comp_state *cs)
|
||||
static int io_issue_sqe(struct io_kiocb *req, unsigned int issue_flags)
|
||||
{
|
||||
struct io_ring_ctx *ctx = req->ctx;
|
||||
int ret;
|
||||
|
||||
switch (req->opcode) {
|
||||
case IORING_OP_NOP:
|
||||
ret = io_nop(req, issue_flags, cs);
|
||||
ret = io_nop(req, issue_flags);
|
||||
break;
|
||||
case IORING_OP_READV:
|
||||
case IORING_OP_READ_FIXED:
|
||||
case IORING_OP_READ:
|
||||
ret = io_read(req, issue_flags, cs);
|
||||
ret = io_read(req, issue_flags);
|
||||
break;
|
||||
case IORING_OP_WRITEV:
|
||||
case IORING_OP_WRITE_FIXED:
|
||||
case IORING_OP_WRITE:
|
||||
ret = io_write(req, issue_flags, cs);
|
||||
ret = io_write(req, issue_flags);
|
||||
break;
|
||||
case IORING_OP_FSYNC:
|
||||
ret = io_fsync(req, issue_flags);
|
||||
@ -6237,16 +6217,16 @@ static int io_issue_sqe(struct io_kiocb *req, unsigned int issue_flags,
|
||||
ret = io_sync_file_range(req, issue_flags);
|
||||
break;
|
||||
case IORING_OP_SENDMSG:
|
||||
ret = io_sendmsg(req, issue_flags, cs);
|
||||
ret = io_sendmsg(req, issue_flags);
|
||||
break;
|
||||
case IORING_OP_SEND:
|
||||
ret = io_send(req, issue_flags, cs);
|
||||
ret = io_send(req, issue_flags);
|
||||
break;
|
||||
case IORING_OP_RECVMSG:
|
||||
ret = io_recvmsg(req, issue_flags, cs);
|
||||
ret = io_recvmsg(req, issue_flags);
|
||||
break;
|
||||
case IORING_OP_RECV:
|
||||
ret = io_recv(req, issue_flags, cs);
|
||||
ret = io_recv(req, issue_flags);
|
||||
break;
|
||||
case IORING_OP_TIMEOUT:
|
||||
ret = io_timeout(req, issue_flags);
|
||||
@ -6255,10 +6235,10 @@ static int io_issue_sqe(struct io_kiocb *req, unsigned int issue_flags,
|
||||
ret = io_timeout_remove(req, issue_flags);
|
||||
break;
|
||||
case IORING_OP_ACCEPT:
|
||||
ret = io_accept(req, issue_flags, cs);
|
||||
ret = io_accept(req, issue_flags);
|
||||
break;
|
||||
case IORING_OP_CONNECT:
|
||||
ret = io_connect(req, issue_flags, cs);
|
||||
ret = io_connect(req, issue_flags);
|
||||
break;
|
||||
case IORING_OP_ASYNC_CANCEL:
|
||||
ret = io_async_cancel(req, issue_flags);
|
||||
@ -6270,10 +6250,10 @@ static int io_issue_sqe(struct io_kiocb *req, unsigned int issue_flags,
|
||||
ret = io_openat(req, issue_flags);
|
||||
break;
|
||||
case IORING_OP_CLOSE:
|
||||
ret = io_close(req, issue_flags, cs);
|
||||
ret = io_close(req, issue_flags);
|
||||
break;
|
||||
case IORING_OP_FILES_UPDATE:
|
||||
ret = io_files_update(req, issue_flags, cs);
|
||||
ret = io_files_update(req, issue_flags);
|
||||
break;
|
||||
case IORING_OP_STATX:
|
||||
ret = io_statx(req, issue_flags);
|
||||
@ -6288,16 +6268,16 @@ static int io_issue_sqe(struct io_kiocb *req, unsigned int issue_flags,
|
||||
ret = io_openat2(req, issue_flags);
|
||||
break;
|
||||
case IORING_OP_EPOLL_CTL:
|
||||
ret = io_epoll_ctl(req, issue_flags, cs);
|
||||
ret = io_epoll_ctl(req, issue_flags);
|
||||
break;
|
||||
case IORING_OP_SPLICE:
|
||||
ret = io_splice(req, issue_flags);
|
||||
break;
|
||||
case IORING_OP_PROVIDE_BUFFERS:
|
||||
ret = io_provide_buffers(req, issue_flags, cs);
|
||||
ret = io_provide_buffers(req, issue_flags);
|
||||
break;
|
||||
case IORING_OP_REMOVE_BUFFERS:
|
||||
ret = io_remove_buffers(req, issue_flags, cs);
|
||||
ret = io_remove_buffers(req, issue_flags);
|
||||
break;
|
||||
case IORING_OP_TEE:
|
||||
ret = io_tee(req, issue_flags);
|
||||
@ -6351,7 +6331,7 @@ static void io_wq_submit_work(struct io_wq_work *work)
|
||||
|
||||
if (!ret) {
|
||||
do {
|
||||
ret = io_issue_sqe(req, 0, NULL);
|
||||
ret = io_issue_sqe(req, 0);
|
||||
/*
|
||||
* We can get EAGAIN for polled IO even though we're
|
||||
* forcing a sync submission from here, since we can't
|
||||
@ -6498,8 +6478,10 @@ static void __io_queue_sqe(struct io_kiocb *req, struct io_comp_state *cs)
|
||||
{
|
||||
struct io_kiocb *linked_timeout;
|
||||
const struct cred *old_creds = NULL;
|
||||
int ret;
|
||||
int ret, issue_flags = IO_URING_F_NONBLOCK;
|
||||
|
||||
if (cs)
|
||||
issue_flags |= IO_URING_F_COMPLETE_DEFER;
|
||||
again:
|
||||
linked_timeout = io_prep_linked_timeout(req);
|
||||
|
||||
@ -6514,7 +6496,7 @@ again:
|
||||
old_creds = override_creds(req->work.identity->creds);
|
||||
}
|
||||
|
||||
ret = io_issue_sqe(req, IO_URING_F_NONBLOCK, cs);
|
||||
ret = io_issue_sqe(req, issue_flags);
|
||||
|
||||
/*
|
||||
* We async punt it if the file wasn't marked NOWAIT, or if the file
|
||||
|
||||
Loading…
Reference in New Issue
Block a user