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/* SPDX-License-Identifier: MIT */
/*
* Description: run various openat(2) tests
*
*/
#include <errno.h>
#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#include <fcntl.h>
#include <limits.h>
#include "helpers.h"
#include "liburing.h"
#define FDS 800
static int no_direct_pick;
static int submit_wait(struct io_uring *ring)
{
struct io_uring_cqe *cqe;
int ret;
ret = io_uring_submit(ring);
if (ret <= 0) {
fprintf(stderr, "sqe submit failed: %d\n", ret);
return 1;
}
ret = io_uring_wait_cqe(ring, &cqe);
if (ret < 0) {
fprintf(stderr, "wait completion %d\n", ret);
return 1;
}
ret = cqe->res;
io_uring_cqe_seen(ring, cqe);
return ret;
}
static inline int try_close(struct io_uring *ring, int slot)
{
struct io_uring_sqe *sqe;
sqe = io_uring_get_sqe(ring);
io_uring_prep_close_direct(sqe, slot);
return submit_wait(ring);
}
static int do_opens(struct io_uring *ring, const char *path, int nr,
int expect_enfile)
{
struct io_uring_cqe *cqe;
struct io_uring_sqe *sqe;
int i, ret;
for (i = 0; i < nr; i++) {
sqe = io_uring_get_sqe(ring);
if (!sqe) {
fprintf(stderr, "get sqe failed\n");
goto err;
}
io_uring_prep_openat_direct(sqe, -1, path, O_RDONLY, 0, 0);
sqe->file_index = UINT_MAX;
ret = io_uring_submit(ring);
if (ret <= 0) {
fprintf(stderr, "sqe submit failed: %d\n", ret);
goto err;
}
}
for (i = 0; i < nr; i++) {
ret = io_uring_wait_cqe(ring, &cqe);
if (ret < 0) {
fprintf(stderr, "wait completion %d\n", ret);
goto err;
}
ret = cqe->res;
if (ret < 0) {
if (!expect_enfile || ret != -ENFILE) {
printf("open=%d, %d\n", cqe->res, i);
goto err;
}
if (!i && ret == -EINVAL) {
no_direct_pick = 1;
return 0;
}
}
io_uring_cqe_seen(ring, cqe);
}
return 0;
err:
return 1;
}
static int test_openat(struct io_uring *ring, const char *path)
{
int ret, i;
/* open all */
ret = do_opens(ring, path, FDS, 0);
if (ret)
goto err;
if (no_direct_pick)
return 0;
/* now close 100 randomly */
for (i = 0; i < 100; i++) {
do {
int slot = rand() % FDS;
ret = try_close(ring, slot);
if (ret == -EBADF)
continue;
break;
} while (1);
}
/* opening 100 should work, we closed 100 */
ret = do_opens(ring, path, 100, 0);
if (ret)
goto err;
/* we should be full now, expect -ENFILE */
ret = do_opens(ring, path, 1, 1);
if (ret)
goto err;
return ret;
err:
fprintf(stderr,"%s: err=%d\n", __FUNCTION__, ret);
return -1;
}
int main(int argc, char *argv[])
{
struct io_uring ring;
const char *path;
int ret;
if (argc > 1)
return 0;
ret = io_uring_queue_init(8, &ring, 0);
if (ret) {
fprintf(stderr, "ring setup failed\n");
return 1;
}
ret = io_uring_register_files_sparse(&ring, FDS);
if (ret ) {
if (ret != -EINVAL) {
fprintf(stderr, "Sparse file registration failed\n");
return 1;
}
/* skip, kernel doesn't support sparse file array */
return 0;
}
path = "/tmp/.open.direct.pick";
t_create_file(path, 4096);
ret = test_openat(&ring, path);
if (ret < 0) {
if (ret == -EINVAL) {
fprintf(stdout, "Open not supported, skipping\n");
goto done;
}
fprintf(stderr, "test_openat absolute failed: %d\n", ret);
goto err;
}
done:
unlink(path);
return 0;
err:
unlink(path);
return 1;
}
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