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/* SPDX-License-Identifier: MIT */
/*
* Description: tests linked requests failing during submission
*/
#include <errno.h>
#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#include <fcntl.h>
#include <assert.h>
#include "liburing.h"
#define DRAIN_USER_DATA 42
static int test_underprep_fail(bool hardlink, bool drain, bool link_last,
int link_size, int fail_idx)
{
const int invalid_fd = 42;
int link_flags = IOSQE_IO_LINK;
int total_submit = link_size;
struct io_uring ring;
struct io_uring_sqe *sqe;
struct io_uring_cqe *cqe;
char buffer[1] = { };
int i, ret, fds[2];
if (drain)
link_flags |= IOSQE_IO_DRAIN;
if (hardlink)
link_flags |= IOSQE_IO_HARDLINK;
assert(fail_idx < link_size);
assert(link_size < 40);
/* create a new ring as it leaves it dirty */
ret = io_uring_queue_init(8, &ring, 0);
if (ret) {
printf("ring setup failed\n");
return -1;
}
if (pipe(fds)) {
perror("pipe");
return -1;
}
if (drain) {
/* clog drain, so following reqs sent to draining */
sqe = io_uring_get_sqe(&ring);
io_uring_prep_read(sqe, fds[0], buffer, sizeof(buffer), 0);
sqe->user_data = DRAIN_USER_DATA;
sqe->flags |= IOSQE_IO_DRAIN;
total_submit++;
}
for (i = 0; i < link_size; i++) {
sqe = io_uring_get_sqe(&ring);
if (i == fail_idx) {
io_uring_prep_read(sqe, invalid_fd, buffer, 1, 0);
sqe->ioprio = (short) -1;
} else {
io_uring_prep_nop(sqe);
}
if (i != link_size - 1 || !link_last)
sqe->flags |= link_flags;
sqe->user_data = i;
}
ret = io_uring_submit(&ring);
if (ret != total_submit) {
/* Old behaviour, failed early and under-submitted */
if (ret == fail_idx + 1 + drain)
goto out;
fprintf(stderr, "submit failed: %d\n", ret);
return -1;
}
if (drain) {
/* unclog drain */
ret = write(fds[1], buffer, sizeof(buffer));
if (ret < 0) {
perror("write");
return 1;
}
}
for (i = 0; i < total_submit; i++) {
ret = io_uring_wait_cqe(&ring, &cqe);
if (ret) {
fprintf(stderr, "wait_cqe=%d\n", ret);
return 1;
}
ret = cqe->res;
if (cqe->user_data == DRAIN_USER_DATA) {
if (ret != 1) {
fprintf(stderr, "drain failed %d\n", ret);
return 1;
}
} else if (cqe->user_data == fail_idx) {
if (ret == 0 || ret == -ECANCELED) {
fprintf(stderr, "half-prep req unexpected return %d\n", ret);
return 1;
}
} else {
if (ret != -ECANCELED) {
fprintf(stderr, "cancel failed %d, ud %d\n", ret, (int)cqe->user_data);
return 1;
}
}
io_uring_cqe_seen(&ring, cqe);
}
out:
close(fds[0]);
close(fds[1]);
io_uring_queue_exit(&ring);
return 0;
}
int main(int argc, char *argv[])
{
int ret, link_size, fail_idx, i;
if (argc > 1)
return 0;
/*
* hardlink, size=3, fail_idx=1, drain=false -- kernel fault
* link, size=3, fail_idx=0, drain=true -- kernel fault
* link, size=3, fail_idx=1, drain=true -- invalid cqe->res
*/
for (link_size = 0; link_size < 3; link_size++) {
for (fail_idx = 0; fail_idx < link_size; fail_idx++) {
for (i = 0; i < 8; i++) {
bool hardlink = (i & 1) != 0;
bool drain = (i & 2) != 0;
bool link_last = (i & 4) != 0;
ret = test_underprep_fail(hardlink, drain, link_last,
link_size, fail_idx);
if (!ret)
continue;
fprintf(stderr, "failed %d, hard %d, drain %d,"
"link_last %d, size %d, idx %d\n",
ret, hardlink, drain, link_last,
link_size, fail_idx);
return 1;
}
}
}
return 0;
}
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