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#include "../config-host.h"
/* SPDX-License-Identifier: MIT */
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <errno.h>
#include <sys/resource.h>
#include <unistd.h>
#include "liburing.h"
#define DIE(...) \
do { \
fprintf(stderr, __VA_ARGS__); \
abort(); \
} while(0)
static const int RSIZE = 2;
static const int OPEN_FLAGS = O_RDWR | O_CREAT | O_LARGEFILE;
static const mode_t OPEN_MODE = S_IRUSR | S_IWUSR;
static int open_io_uring(struct io_uring *ring, int dfd, const char *fn)
{
struct io_uring_sqe *sqe;
struct io_uring_cqe *cqe;
int ret, fd;
sqe = io_uring_get_sqe(ring);
if (!sqe) {
fprintf(stderr, "failed to get sqe\n");
return 1;
}
io_uring_prep_openat(sqe, dfd, fn, OPEN_FLAGS, OPEN_MODE);
ret = io_uring_submit(ring);
if (ret < 0) {
fprintf(stderr, "failed to submit openat: %s\n", strerror(-ret));
return 1;
}
ret = io_uring_wait_cqe(ring, &cqe);
fd = cqe->res;
io_uring_cqe_seen(ring, cqe);
if (ret < 0) {
fprintf(stderr, "wait_cqe failed: %s\n", strerror(-ret));
return 1;
} else if (fd < 0) {
fprintf(stderr, "io_uring openat failed: %s\n", strerror(-fd));
return 1;
}
close(fd);
return 0;
}
static int prepare_file(int dfd, const char* fn)
{
const char buf[] = "foo";
int fd, res;
fd = openat(dfd, fn, OPEN_FLAGS, OPEN_MODE);
if (fd < 0) {
fprintf(stderr, "prepare/open: %s\n", strerror(errno));
return -1;
}
res = pwrite(fd, buf, sizeof(buf), 1ull << 32);
if (res < 0)
fprintf(stderr, "prepare/pwrite: %s\n", strerror(errno));
close(fd);
return res < 0 ? res : 0;
}
static int test_linked_files(int dfd, const char *fn, bool async)
{
struct io_uring ring;
struct io_uring_sqe *sqe;
char buffer[128];
struct iovec iov = {.iov_base = buffer, .iov_len = sizeof(buffer), };
int ret, fd;
int fds[2];
ret = io_uring_queue_init(10, &ring, 0);
if (ret < 0)
DIE("failed to init io_uring: %s\n", strerror(-ret));
if (pipe(fds)) {
perror("pipe");
return 1;
}
sqe = io_uring_get_sqe(&ring);
if (!sqe) {
printf("get sqe failed\n");
return -1;
}
io_uring_prep_readv(sqe, fds[0], &iov, 1, 0);
sqe->flags |= IOSQE_IO_LINK;
if (async)
sqe->flags |= IOSQE_ASYNC;
sqe = io_uring_get_sqe(&ring);
if (!sqe) {
fprintf(stderr, "failed to get sqe\n");
return 1;
}
io_uring_prep_openat(sqe, dfd, fn, OPEN_FLAGS, OPEN_MODE);
ret = io_uring_submit(&ring);
if (ret != 2) {
fprintf(stderr, "failed to submit openat: %s\n", strerror(-ret));
return 1;
}
fd = dup(ring.ring_fd);
if (fd < 0) {
fprintf(stderr, "dup() failed: %s\n", strerror(-fd));
return 1;
}
/* io_uring->flush() */
close(fd);
io_uring_queue_exit(&ring);
return 0;
}
static int test_drained_files(int dfd, const char *fn, bool linked, bool prepend)
{
struct io_uring ring;
struct io_uring_sqe *sqe;
char buffer[128];
struct iovec iov = {.iov_base = buffer, .iov_len = sizeof(buffer), };
int ret, fd, fds[2], to_cancel = 0;
ret = io_uring_queue_init(10, &ring, 0);
if (ret < 0)
DIE("failed to init io_uring: %s\n", strerror(-ret));
if (pipe(fds)) {
perror("pipe");
return 1;
}
sqe = io_uring_get_sqe(&ring);
if (!sqe) {
printf("get sqe failed\n");
return -1;
}
io_uring_prep_readv(sqe, fds[0], &iov, 1, 0);
sqe->user_data = 0;
if (prepend) {
sqe = io_uring_get_sqe(&ring);
if (!sqe) {
fprintf(stderr, "failed to get sqe\n");
return 1;
}
io_uring_prep_nop(sqe);
sqe->flags |= IOSQE_IO_DRAIN;
to_cancel++;
sqe->user_data = to_cancel;
}
if (linked) {
sqe = io_uring_get_sqe(&ring);
if (!sqe) {
fprintf(stderr, "failed to get sqe\n");
return 1;
}
io_uring_prep_nop(sqe);
sqe->flags |= IOSQE_IO_DRAIN | IOSQE_IO_LINK;
to_cancel++;
sqe->user_data = to_cancel;
}
sqe = io_uring_get_sqe(&ring);
if (!sqe) {
fprintf(stderr, "failed to get sqe\n");
return 1;
}
io_uring_prep_openat(sqe, dfd, fn, OPEN_FLAGS, OPEN_MODE);
sqe->flags |= IOSQE_IO_DRAIN;
to_cancel++;
sqe->user_data = to_cancel;
ret = io_uring_submit(&ring);
if (ret != 1 + to_cancel) {
fprintf(stderr, "failed to submit openat: %s\n", strerror(-ret));
return 1;
}
fd = dup(ring.ring_fd);
if (fd < 0) {
fprintf(stderr, "dup() failed: %s\n", strerror(-fd));
return 1;
}
/*
* close(), which triggers ->flush(), and io_uring_queue_exit()
* should successfully return and not hang.
*/
close(fd);
io_uring_queue_exit(&ring);
return 0;
}
int main(int argc, char *argv[])
{
const char *fn = "io_uring_openat_test";
struct io_uring ring;
int ret, dfd;
if (argc > 1)
return 0;
dfd = open("/tmp", O_PATH);
if (dfd < 0)
DIE("open /tmp: %s\n", strerror(errno));
ret = io_uring_queue_init(RSIZE, &ring, 0);
if (ret < 0)
DIE("failed to init io_uring: %s\n", strerror(-ret));
if (prepare_file(dfd, fn))
return 1;
ret = open_io_uring(&ring, dfd, fn);
if (ret) {
fprintf(stderr, "open_io_uring() failed\n");
goto out;
}
ret = test_linked_files(dfd, fn, false);
if (ret) {
fprintf(stderr, "test_linked_files() !async failed\n");
goto out;
}
ret = test_linked_files(dfd, fn, true);
if (ret) {
fprintf(stderr, "test_linked_files() async failed\n");
goto out;
}
ret = test_drained_files(dfd, fn, false, false);
if (ret) {
fprintf(stderr, "test_drained_files() failed\n");
goto out;
}
ret = test_drained_files(dfd, fn, false, true);
if (ret) {
fprintf(stderr, "test_drained_files() middle failed\n");
goto out;
}
ret = test_drained_files(dfd, fn, true, false);
if (ret) {
fprintf(stderr, "test_drained_files() linked failed\n");
goto out;
}
out:
io_uring_queue_exit(&ring);
close(dfd);
unlink("/tmp/io_uring_openat_test");
return ret;
}
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