[LTP] io_uring: Add test for READV and WRITEV operations

[linuxtestproject.agent@gmail.com]

Hi Sachin,

On Thu, 16 Apr 2026, Sachin Sant wrote:
> io_uring: Add test for READV and WRITEV operations

> Additionally merge io_uring_init_buffer_pattern() into unified
> init_iovec_buffers() function that supports both rotating and
> simple character patterns

This mixes two logical changes in one commit. io_uring_init_buffer_pattern()
was unused by any existing test; its removal should be a separate preceding
commit, e.g. "io_uring: remove unused io_uring_init_buffer_pattern()".

[...]

> +static void setup(void)
> +{
> +	io_uring_setup_supported_by_kernel();
> +	sigemptyset(&sig);
> +	memset(&s, 0, sizeof(s));
> +	io_uring_setup_queue(&s, QUEUE_DEPTH, 0);
> +	init_iovec_buffers(write_iovs, NUM_VECS, 'A', 1);
> +	clear_iovec_buffers(read_iovs, NUM_VECS);
> +}

read_iovs is modified by READV in run() but only cleared in setup(). With
-i, the second iteration starts with stale data. Add
clear_iovec_buffers(read_iovs, NUM_VECS) at the top of run().

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