the-tree/io_uring/tctx.h

0001 // SPDX-License-Identifier: GPL-2.0
0002
0003 struct io_tctx_node {
0004     struct list_head    ctx_node;
0005     struct task_struct  *task;
0006     struct io_ring_ctx  *ctx;
0007 };
0008
0009 int io_uring_alloc_task_context(struct task_struct *task,
0010                 struct io_ring_ctx *ctx);
0011 void io_uring_del_tctx_node(unsigned long index);
0012 int __io_uring_add_tctx_node(struct io_ring_ctx *ctx, bool submitter);
0013 void io_uring_clean_tctx(struct io_uring_task *tctx);
0014
0015 void io_uring_unreg_ringfd(void);
0016 int io_ringfd_register(struct io_ring_ctx *ctx, void __user *__arg,
0017                unsigned nr_args);
0018 int io_ringfd_unregister(struct io_ring_ctx *ctx, void __user *__arg,
0019              unsigned nr_args);
0020
0021 /*
0022  * Note that this task has used io_uring. We use it for cancelation purposes.
0023  */
0024 static inline int io_uring_add_tctx_node(struct io_ring_ctx *ctx)
0025 {
0026     struct io_uring_task *tctx = current->io_uring;
0027
0028     if (likely(tctx && tctx->last == ctx))
0029         return 0;
0030     return __io_uring_add_tctx_node(ctx, true);
0031 }