Re: [PATCH 2/9] io_uring: add IORING_OP_PROVIDE_BUFFERS

[Jens Axboe <axboe@kernel.dk>]

On 3/10/20 9:04 AM, Jens Axboe wrote:
> +static int io_provide_buffers(struct io_kiocb *req, bool force_nonblock)
> +{
> +	struct io_provide_buf *p = &req->pbuf;
> +	struct io_ring_ctx *ctx = req->ctx;
> +	struct io_buffer *head, *list;
> +	int ret = 0;
> +
> +	/*
> +	 * "Normal" inline submissions always hold the uring_lock, since we
> +	 * grab it from the system call. Same is true for the SQPOLL offload.
> +	 * The only exception is when we've detached the request and issue it
> +	 * from an async worker thread, grab the lock for that case.
> +	 */
> +	if (!force_nonblock)
> +		mutex_lock(&ctx->uring_lock);

I mistakenly introduced io_ring_submit_lock() in patch 3 instead of this
one, I've corrected this mistake in the git branch.

-- 
Jens Axboe