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io_uring: add IORING_SETUP_SINGLE_ISSUER

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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>
This commit is contained in:
Pavel Begunkov
2022-06-16 10:22:08 +01:00
committed by Jens Axboe
parent 0ec6dca223
commit 97bbdc06a4
5 changed files with 36 additions and 8 deletions
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4
io_uring/tctx.h
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@@ -34,7 +34,7 @@ struct io_tctx_node {
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);
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);
@@ -52,5 +52,5 @@ static inline int io_uring_add_tctx_node(struct io_ring_ctx *ctx)
if (likely(tctx && tctx->last == ctx))
return 0;
return __io_uring_add_tctx_node(ctx);
return __io_uring_add_tctx_node(ctx, true);
}