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97bbdc06a4
Add a new IORING_SETUP_SINGLE_ISSUER flag and the userspace visible part of it, i.e. put limitations of submitters. Also, don't allow it together with IOPOLL as we're not going to put it to good use. Signed-off-by: Pavel Begunkov <asml.silence@gmail.com> Link: https://lore.kernel.org/r/4bcc41ee467fdf04c8aab8baf6ce3ba21858c3d4.1655371007.git.asml.silence@gmail.com Reviewed-by: Hao Xu <howeyxu@tencent.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
56 lines
1.4 KiB
C
56 lines
1.4 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Arbitrary limit, can be raised if need be
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*/
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#define IO_RINGFD_REG_MAX 16
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struct io_uring_task {
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/* submission side */
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int cached_refs;
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struct xarray xa;
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struct wait_queue_head wait;
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const struct io_ring_ctx *last;
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struct io_wq *io_wq;
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struct percpu_counter inflight;
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atomic_t inflight_tracked;
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atomic_t in_idle;
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spinlock_t task_lock;
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struct io_wq_work_list task_list;
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struct io_wq_work_list prio_task_list;
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struct callback_head task_work;
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bool task_running;
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struct file *registered_rings[IO_RINGFD_REG_MAX];
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};
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struct io_tctx_node {
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struct list_head ctx_node;
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struct task_struct *task;
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struct io_ring_ctx *ctx;
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};
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int io_uring_alloc_task_context(struct task_struct *task,
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struct io_ring_ctx *ctx);
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void io_uring_del_tctx_node(unsigned long index);
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int __io_uring_add_tctx_node(struct io_ring_ctx *ctx, bool submitter);
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void io_uring_clean_tctx(struct io_uring_task *tctx);
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void io_uring_unreg_ringfd(void);
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int io_ringfd_register(struct io_ring_ctx *ctx, void __user *__arg,
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unsigned nr_args);
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int io_ringfd_unregister(struct io_ring_ctx *ctx, void __user *__arg,
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unsigned nr_args);
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/*
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* Note that this task has used io_uring. We use it for cancelation purposes.
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*/
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static inline int io_uring_add_tctx_node(struct io_ring_ctx *ctx)
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{
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struct io_uring_task *tctx = current->io_uring;
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if (likely(tctx && tctx->last == ctx))
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return 0;
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return __io_uring_add_tctx_node(ctx, true);
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}
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