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>

diff --git a/fs/io_uring.c b/fs/io_uring.c
index ac233d04ee712f21888ef0e7f3b19d225f882735..273ebbac065462420f0c648c857eb8a25a217d4d 100644 (file)
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -189,6 +189,7 @@ struct io_rings {
 
 enum io_uring_cmd_flags {
        IO_URING_F_NONBLOCK             = 1,
+       IO_URING_F_COMPLETE_DEFER       = 2,
 };
 
 struct io_mapped_ubuf {
@@ -1018,7 +1019,7 @@ static void init_fixed_file_ref_node(struct io_ring_ctx *ctx,
                                     struct fixed_rsrc_ref_node *ref_node);
 
 static void __io_complete_rw(struct io_kiocb *req, long res, long res2,
-                            struct io_comp_state *cs);
+                            unsigned int issue_flags);
 static void io_cqring_fill_event(struct io_kiocb *req, long res);
 static void io_put_req(struct io_kiocb *req);
 static void io_put_req_deferred(struct io_kiocb *req, int nr);
@@ -1957,7 +1958,7 @@ static void io_submit_flush_completions(struct io_comp_state *cs)
 }
 
 static void io_req_complete_state(struct io_kiocb *req, long res,
-                                 unsigned int cflags, struct io_comp_state *cs)
+                                 unsigned int cflags)
 {
        io_clean_op(req);
        req->result = res;
@@ -1965,18 +1966,18 @@ static void io_req_complete_state(struct io_kiocb *req, long res,
        req->flags |= REQ_F_COMPLETE_INLINE;
 }
 
-static inline void __io_req_complete(struct io_kiocb *req, long res,
-                                    unsigned cflags, struct io_comp_state *cs)
+static inline void __io_req_complete(struct io_kiocb *req, unsigned issue_flags,
+                                    long res, unsigned cflags)
 {
-       if (!cs)
-               io_req_complete_nostate(req, res, cflags);
+       if (issue_flags & IO_URING_F_COMPLETE_DEFER)
+               io_req_complete_state(req, res, cflags);
        else
-               io_req_complete_state(req, res, cflags, cs);
+               io_req_complete_nostate(req, res, cflags);
 }
 
 static inline void io_req_complete(struct io_kiocb *req, long res)
 {
-       __io_req_complete(req, res, 0, NULL);
+       __io_req_complete(req, 0, res, 0);
 }
 
 static inline bool io_is_fallback_req(struct io_kiocb *req)
@@ -2449,7 +2450,7 @@ static void io_iopoll_queue(struct list_head *again)
        do {
                req = list_first_entry(again, struct io_kiocb, inflight_entry);
                list_del(&req->inflight_entry);
-               __io_complete_rw(req, -EAGAIN, 0, NULL);
+               __io_complete_rw(req, -EAGAIN, 0, 0);
        } while (!list_empty(again));
 }
 
@@ -2662,7 +2663,7 @@ static void kiocb_end_write(struct io_kiocb *req)
 }
 
 static void io_complete_rw_common(struct kiocb *kiocb, long res,
-                                 struct io_comp_state *cs)
+                                 unsigned int issue_flags)
 {
        struct io_kiocb *req = container_of(kiocb, struct io_kiocb, rw.kiocb);
        int cflags = 0;
@@ -2674,7 +2675,7 @@ static void io_complete_rw_common(struct kiocb *kiocb, long res,
                req_set_fail_links(req);
        if (req->flags & REQ_F_BUFFER_SELECTED)
                cflags = io_put_rw_kbuf(req);
-       __io_req_complete(req, res, cflags, cs);
+       __io_req_complete(req, issue_flags, res, cflags);
 }
 
 #ifdef CONFIG_BLOCK
@@ -2741,17 +2742,17 @@ static bool io_rw_reissue(struct io_kiocb *req, long res)
 }
 
 static void __io_complete_rw(struct io_kiocb *req, long res, long res2,
-                            struct io_comp_state *cs)
+                            unsigned int issue_flags)
 {
        if (!io_rw_reissue(req, res))
-               io_complete_rw_common(&req->rw.kiocb, res, cs);
+               io_complete_rw_common(&req->rw.kiocb, res, issue_flags);
 }
 
 static void io_complete_rw(struct kiocb *kiocb, long res, long res2)
 {
        struct io_kiocb *req = container_of(kiocb, struct io_kiocb, rw.kiocb);
 
-       __io_complete_rw(req, res, res2, NULL);
+       __io_complete_rw(req, res, res2, 0);
 }
 
 static void io_complete_rw_iopoll(struct kiocb *kiocb, long res, long res2)
@@ -2970,7 +2971,7 @@ static inline void io_rw_done(struct kiocb *kiocb, ssize_t ret)
 }
 
 static void kiocb_done(struct kiocb *kiocb, ssize_t ret,
-                      struct io_comp_state *cs)
+                      unsigned int issue_flags)
 {
        struct io_kiocb *req = container_of(kiocb, struct io_kiocb, rw.kiocb);
        struct io_async_rw *io = req->async_data;
@@ -2986,7 +2987,7 @@ static void kiocb_done(struct kiocb *kiocb, ssize_t ret,
        if (req->flags & REQ_F_CUR_POS)
                req->file->f_pos = kiocb->ki_pos;
        if (ret >= 0 && kiocb->ki_complete == io_complete_rw)
-               __io_complete_rw(req, ret, 0, cs);
+               __io_complete_rw(req, ret, 0, issue_flags);
        else
                io_rw_done(kiocb, ret);
 }
@@ -3481,8 +3482,7 @@ static int io_iter_do_read(struct io_kiocb *req, struct iov_iter *iter)
                return -EINVAL;
 }
 
-static int io_read(struct io_kiocb *req, unsigned int issue_flags,
-                  struct io_comp_state *cs)
+static int io_read(struct io_kiocb *req, unsigned int issue_flags)
 {
        struct iovec inline_vecs[UIO_FASTIOV], *iovec = inline_vecs;
        struct kiocb *kiocb = &req->rw.kiocb;
@@ -3572,7 +3572,7 @@ static int io_read(struct io_kiocb *req, unsigned int issue_flags,
                /* we got some bytes, but not all. retry. */
        } while (ret > 0 && ret < io_size);
 done:
-       kiocb_done(kiocb, ret, cs);
+       kiocb_done(kiocb, ret, issue_flags);
        return 0;
 }
 
@@ -3593,8 +3593,7 @@ static int io_write_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
        return io_rw_prep_async(req, WRITE);
 }
 
-static int io_write(struct io_kiocb *req, unsigned int issue_flags,
-                   struct io_comp_state *cs)
+static int io_write(struct io_kiocb *req, unsigned int issue_flags)
 {
        struct iovec inline_vecs[UIO_FASTIOV], *iovec = inline_vecs;
        struct kiocb *kiocb = &req->rw.kiocb;
@@ -3668,7 +3667,7 @@ static int io_write(struct io_kiocb *req, unsigned int issue_flags,
                if ((req->ctx->flags & IORING_SETUP_IOPOLL) && ret2 == -EAGAIN)
                        goto copy_iov;
 done:
-               kiocb_done(kiocb, ret2, cs);
+               kiocb_done(kiocb, ret2, issue_flags);
        } else {
 copy_iov:
                /* some cases will consume bytes even on error returns */
@@ -3917,15 +3916,14 @@ static int io_splice(struct io_kiocb *req, unsigned int issue_flags)
 /*
  * IORING_OP_NOP just posts a completion event, nothing else.
  */
-static int io_nop(struct io_kiocb *req, unsigned int issue_flags,
-                 struct io_comp_state *cs)
+static int io_nop(struct io_kiocb *req, unsigned int issue_flags)
 {
        struct io_ring_ctx *ctx = req->ctx;
 
        if (unlikely(ctx->flags & IORING_SETUP_IOPOLL))
                return -EINVAL;
 
-       __io_req_complete(req, 0, 0, cs);
+       __io_req_complete(req, issue_flags, 0, 0);
        return 0;
 }
 
@@ -4166,8 +4164,7 @@ static int __io_remove_buffers(struct io_ring_ctx *ctx, struct io_buffer *buf,
        return i;
 }
 
-static int io_remove_buffers(struct io_kiocb *req, unsigned int issue_flags,
-                            struct io_comp_state *cs)
+static int io_remove_buffers(struct io_kiocb *req, unsigned int issue_flags)
 {
        struct io_provide_buf *p = &req->pbuf;
        struct io_ring_ctx *ctx = req->ctx;
@@ -4188,11 +4185,11 @@ static int io_remove_buffers(struct io_kiocb *req, unsigned int issue_flags,
 
        /* need to hold the lock to complete IOPOLL requests */
        if (ctx->flags & IORING_SETUP_IOPOLL) {
-               __io_req_complete(req, ret, 0, cs);
+               __io_req_complete(req, issue_flags, ret, 0);
                io_ring_submit_unlock(ctx, !force_nonblock);
        } else {
                io_ring_submit_unlock(ctx, !force_nonblock);
-               __io_req_complete(req, ret, 0, cs);
+               __io_req_complete(req, issue_flags, ret, 0);
        }
        return 0;
 }
@@ -4251,8 +4248,7 @@ static int io_add_buffers(struct io_provide_buf *pbuf, struct io_buffer **head)
        return i ? i : -ENOMEM;
 }
 
-static int io_provide_buffers(struct io_kiocb *req, unsigned int issue_flags,
-                             struct io_comp_state *cs)
+static int io_provide_buffers(struct io_kiocb *req, unsigned int issue_flags)
 {
        struct io_provide_buf *p = &req->pbuf;
        struct io_ring_ctx *ctx = req->ctx;
@@ -4284,11 +4280,11 @@ out:
 
        /* need to hold the lock to complete IOPOLL requests */
        if (ctx->flags & IORING_SETUP_IOPOLL) {
-               __io_req_complete(req, ret, 0, cs);
+               __io_req_complete(req, issue_flags, ret, 0);
                io_ring_submit_unlock(ctx, !force_nonblock);
        } else {
                io_ring_submit_unlock(ctx, !force_nonblock);
-               __io_req_complete(req, ret, 0, cs);
+               __io_req_complete(req, issue_flags, ret, 0);
        }
        return 0;
 }
@@ -4320,8 +4316,7 @@ static int io_epoll_ctl_prep(struct io_kiocb *req,
 #endif
 }
 
-static int io_epoll_ctl(struct io_kiocb *req, unsigned int issue_flags,
-                       struct io_comp_state *cs)
+static int io_epoll_ctl(struct io_kiocb *req, unsigned int issue_flags)
 {
 #if defined(CONFIG_EPOLL)
        struct io_epoll *ie = &req->epoll;
@@ -4334,7 +4329,7 @@ static int io_epoll_ctl(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;
 #else
        return -EOPNOTSUPP;
@@ -4466,8 +4461,7 @@ static int io_close_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
        return 0;
 }
 
-static int io_close(struct io_kiocb *req, unsigned int issue_flags,
-                   struct io_comp_state *cs)
+static int io_close(struct io_kiocb *req, unsigned int issue_flags)
 {
        struct files_struct *files = current->files;
        struct io_close *close = &req->close;
@@ -4516,7 +4510,7 @@ err:
                req_set_fail_links(req);
        if (file)
                fput(file);
-       __io_req_complete(req, ret, 0, cs);
+       __io_req_complete(req, issue_flags, ret, 0);
        return 0;
 }
 
@@ -4612,8 +4606,7 @@ static int io_sendmsg_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
        return ret;
 }
 
-static int io_sendmsg(struct io_kiocb *req, unsigned int issue_flags,
-                     struct io_comp_state *cs)
+static int io_sendmsg(struct io_kiocb *req, unsigned int issue_flags)
 {
        struct io_async_msghdr iomsg, *kmsg;
        struct socket *sock;
@@ -4650,12 +4643,11 @@ static int io_sendmsg(struct io_kiocb *req, unsigned int issue_flags,
        req->flags &= ~REQ_F_NEED_CLEANUP;
        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;
 }
 
-static int io_send(struct io_kiocb *req, unsigned int issue_flags,
-                  struct io_comp_state *cs)
+static int io_send(struct io_kiocb *req, unsigned int issue_flags)
 {
        struct io_sr_msg *sr = &req->sr_msg;
        struct msghdr msg;
@@ -4692,7 +4684,7 @@ static int io_send(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;
 }
 
@@ -4833,8 +4825,7 @@ static int io_recvmsg_prep(struct io_kiocb *req,
        return ret;
 }
 
-static int io_recvmsg(struct io_kiocb *req, unsigned int issue_flags,
-                     struct io_comp_state *cs)
+static int io_recvmsg(struct io_kiocb *req, unsigned int issue_flags)
 {
        struct io_async_msghdr iomsg, *kmsg;
        struct socket *sock;
@@ -4886,12 +4877,11 @@ static int io_recvmsg(struct io_kiocb *req, unsigned int issue_flags,
        req->flags &= ~REQ_F_NEED_CLEANUP;
        if (ret < 0)
                req_set_fail_links(req);
-       __io_req_complete(req, ret, cflags, cs);
+       __io_req_complete(req, issue_flags, ret, cflags);
        return 0;
 }
 
-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)
 {
        struct io_buffer *kbuf;
        struct io_sr_msg *sr = &req->sr_msg;
@@ -4941,7 +4931,7 @@ out_free:
                cflags = io_put_recv_kbuf(req);
        if (ret < 0)
                req_set_fail_links(req);
-       __io_req_complete(req, ret, cflags, cs);
+       __io_req_complete(req, issue_flags, ret, cflags);
        return 0;
 }
 
@@ -4961,8 +4951,7 @@ static int io_accept_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
        return 0;
 }
 
-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)
 {
        struct io_accept *accept = &req->accept;
        bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK;
@@ -4982,7 +4971,7 @@ static int io_accept(struct io_kiocb *req, unsigned int issue_flags,
                        ret = -EINTR;
                req_set_fail_links(req);
        }
-       __io_req_complete(req, ret, 0, cs);
+       __io_req_complete(req, issue_flags, ret, 0);
        return 0;
 }
 
@@ -5006,8 +4995,7 @@ static int io_connect_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
                                        &io->address);
 }
 
-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)
 {
        struct io_async_connect __io, *io;
        unsigned file_flags;
@@ -5045,7 +5033,7 @@ static int io_connect(struct io_kiocb *req, unsigned int issue_flags,
 out:
        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;
 }
 #else /* !CONFIG_NET */
@@ -5054,14 +5042,12 @@ static int io_sendmsg_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
        return -EOPNOTSUPP;
 }
 
-static int io_sendmsg(struct io_kiocb *req, unsigned int issue_flags,
-                     struct io_comp_state *cs)
+static int io_sendmsg(struct io_kiocb *req, unsigned int issue_flags)
 {
        return -EOPNOTSUPP;
 }
 
-static int io_send(struct io_kiocb *req, unsigned int issue_flags,
-                  struct io_comp_state *cs)
+static int io_send(struct io_kiocb *req, unsigned int issue_flags)
 {
        return -EOPNOTSUPP;
 }
@@ -5072,14 +5058,12 @@ static int io_recvmsg_prep(struct io_kiocb *req,
        return -EOPNOTSUPP;
 }
 
-static int io_recvmsg(struct io_kiocb *req, unsigned int issue_flags,
-                     struct io_comp_state *cs)
+static int io_recvmsg(struct io_kiocb *req, unsigned int issue_flags)
 {
        return -EOPNOTSUPP;
 }
 
-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