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// SPDX-License-Identifier: GPL-2.0
/*
* Arbitrary limit, can be raised if need be
*/
#define IO_RINGFD_REG_MAX 16
struct io_uring_task {
/* submission side */
int cached_refs;
const struct io_ring_ctx *last;
struct io_wq *io_wq;
struct file *registered_rings[IO_RINGFD_REG_MAX];
struct xarray xa;
struct wait_queue_head wait;
atomic_t in_idle;
atomic_t inflight_tracked;
struct percpu_counter inflight;
struct { /* task_work */
spinlock_t task_lock;
bool task_running;
struct io_wq_work_list task_list;
struct callback_head task_work;
} ____cacheline_aligned_in_smp;
};
struct io_tctx_node {
struct list_head ctx_node;
struct task_struct *task;
struct io_ring_ctx *ctx;
};
int io_uring_alloc_task_context(struct task_struct *task,
struct io_ring_ctx *ctx);
void io_uring_del_tctx_node(unsigned long index);
int __io_uring_add_tctx_node(struct io_ring_ctx *ctx, bool submitter);
void io_uring_clean_tctx(struct io_uring_task *tctx);
void io_uring_unreg_ringfd(void);
int io_ringfd_register(struct io_ring_ctx *ctx, void __user *__arg,
unsigned nr_args);
int io_ringfd_unregister(struct io_ring_ctx *ctx, void __user *__arg,
unsigned nr_args);
/*
* Note that this task has used io_uring. We use it for cancelation purposes.
*/
static inline int io_uring_add_tctx_node(struct io_ring_ctx *ctx)
{
struct io_uring_task *tctx = current->io_uring;
if (likely(tctx && tctx->last == ctx))
return 0;
return __io_uring_add_tctx_node(ctx, true);
}
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