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#include "../config-host.h"
/* SPDX-License-Identifier: MIT */
/*
* Test fixed buffer merging/skipping
*
* Taken from: https://github.com/axboe/liburing/issues/994
*
*/
#include <stdio.h>
#include <string.h>
#include <fcntl.h>
#include <stdlib.h>
#include <unistd.h>
#include "liburing.h"
#include "helpers.h"
int main(int argc, char *argv[])
{
int ret, i, fd, initial_offset = 4096, num_requests = 3;
struct io_uring ring;
struct io_uring_sqe *sqe;
struct io_uring_cqe *cqe;
struct iovec iov;
char *buffer, *to_free;
unsigned head;
char filename[64];
ret = io_uring_queue_init(4, &ring, 0);
if (ret) {
fprintf(stderr, "queue_init: %d\n", ret);
return T_EXIT_FAIL;
}
sprintf(filename, ".fixed-buf-%d", getpid());
t_create_file(filename, 4 * 4096);
fd = open(filename, O_RDONLY | O_DIRECT, 0644);
if (fd < 0) {
perror("open");
goto err_unlink;
}
to_free = buffer = aligned_alloc(4096, 128 * 4096);
if (!buffer) {
perror("aligned_alloc");
goto err_unlink;
}
/* Register buffer */
iov.iov_base = buffer;
iov.iov_len = 128 * 4096;
ret = io_uring_register_buffers(&ring, &iov, 1);
if (ret) {
fprintf(stderr, "buf register: %d\n", ret);
goto err_unlink;
}
/* Prepare read requests */
buffer += initial_offset;
for (i = 0; i < num_requests; i++) {
sqe = io_uring_get_sqe(&ring);
io_uring_prep_read_fixed(sqe, fd, buffer, 4096, 4096 * i, 0);
buffer += 4096;
}
/* Submit requests and reap completions */
ret = io_uring_submit_and_wait(&ring, num_requests);
if (ret != num_requests) {
fprintf(stderr, "Submit and wait: %d\n", ret);
goto err_unlink;
}
i = 0;
io_uring_for_each_cqe(&ring, head, cqe) {
if (cqe->res != 4096) {
fprintf(stderr, "cqe: %d\n", cqe->res);
goto err_unlink;
}
i++;
}
if (i != num_requests) {
fprintf(stderr, "Got %d completions\n", i);
goto err_unlink;
}
io_uring_cq_advance(&ring, i);
io_uring_queue_exit(&ring);
close(fd);
free(to_free);
unlink(filename);
return T_EXIT_PASS;
err_unlink:
unlink(filename);
return T_EXIT_FAIL;
}
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