test/io-cancel.c - platform/external/liburing - Git at Google

 /* SPDX-License-Identifier: MIT */
 /*
  * Description: Basic IO cancel test
  */
 #include <errno.h>
 #include <stdio.h>
 #include <unistd.h>
 #include <stdlib.h>
 #include <string.h>
 #include <fcntl.h>
 #include <sys/types.h>
 #include <sys/time.h>
 #include <sys/wait.h>
 #include <sys/poll.h>

 #include "helpers.h"
 #include "liburing.h"

 #define FILE_SIZE	(128 * 1024)
 #define BS		4096
 #define BUFFERS		(FILE_SIZE / BS)

 static struct iovec *vecs;

 static unsigned long long utime_since(const struct timeval *s,
 				      const struct timeval *e)
 {
 	long long sec, usec;

 	sec = e->tv_sec - s->tv_sec;
 	usec = (e->tv_usec - s->tv_usec);
 	if (sec > 0 && usec < 0) {
 		sec--;
 		usec += 1000000;
 	}

 	sec *= 1000000;
 	return sec + usec;
 }

 static unsigned long long utime_since_now(struct timeval *tv)
 {
 	struct timeval end;

 	gettimeofday(&end, NULL);
 	return utime_since(tv, &end);
 }

 static int start_io(struct io_uring *ring, int fd, int do_write)
 {
 	struct io_uring_sqe *sqe;
 	int i, ret;

 	for (i = 0; i < BUFFERS; i++) {
 		off_t offset;

 		sqe = io_uring_get_sqe(ring);
 		if (!sqe) {
 			fprintf(stderr, "sqe get failed\n");
 			goto err;
 		}
 		offset = BS * (rand() % BUFFERS);
 		if (do_write) {
 			io_uring_prep_writev(sqe, fd, &vecs[i], 1, offset);
 		} else {
 			io_uring_prep_readv(sqe, fd, &vecs[i], 1, offset);
 		}
 		sqe->user_data = i + 1;
 	}

 	ret = io_uring_submit(ring);
 	if (ret != BUFFERS) {
 		fprintf(stderr, "submit got %d, wanted %d\n", ret, BUFFERS);
 		goto err;
 	}

 	return 0;
 err:
 	return 1;
 }

 static int wait_io(struct io_uring *ring, unsigned nr_io, int do_partial)
 {
 	struct io_uring_cqe *cqe;
 	int i, ret;

 	for (i = 0; i < nr_io; i++) {
 		ret = io_uring_wait_cqe(ring, &cqe);
 		if (ret) {
 			fprintf(stderr, "wait_cqe=%d\n", ret);
 			goto err;
 		}
 		if (do_partial && cqe->user_data) {
 			if (!(cqe->user_data & 1)) {
 				if (cqe->res != BS) {
 					fprintf(stderr, "IO %d wasn't cancelled but got error %d\n", (unsigned) cqe->user_data, cqe->res);
 					goto err;
 				}
 			}
 		}
 		io_uring_cqe_seen(ring, cqe);
 	}
 	return 0;
 err:
 	return 1;

 }

 static int do_io(struct io_uring *ring, int fd, int do_write)
 {
 	if (start_io(ring, fd, do_write))
 		return 1;
 	if (wait_io(ring, BUFFERS, 0))
 		return 1;
 	return 0;
 }

 static int start_cancel(struct io_uring *ring, int do_partial)
 {
 	struct io_uring_sqe *sqe;
 	int i, ret, submitted = 0;

 	for (i = 0; i < BUFFERS; i++) {
 		if (do_partial && (i & 1))
 			continue;
 		sqe = io_uring_get_sqe(ring);
 		if (!sqe) {
 			fprintf(stderr, "sqe get failed\n");
 			goto err;
 		}
 		io_uring_prep_cancel(sqe, (void *) (unsigned long) i + 1, 0);
 		sqe->user_data = 0;
 		submitted++;
 	}

 	ret = io_uring_submit(ring);
 	if (ret != submitted) {
 		fprintf(stderr, "submit got %d, wanted %d\n", ret, submitted);
 		goto err;
 	}
 	return 0;
 err:
 	return 1;
 }

 /*
  * Test cancels. If 'do_partial' is set, then we only attempt to cancel half of
  * the submitted IO. This is done to verify that cancelling one piece of IO doesn't
  * impact others.
  */
 static int test_io_cancel(const char *file, int do_write, int do_partial)
 {
 	struct io_uring ring;
 	struct timeval start_tv;
 	unsigned long usecs;
 	unsigned to_wait;
 	int fd, ret;

 	fd = open(file, O_RDWR | O_DIRECT);
 	if (fd < 0) {
 		perror("file open");
 		goto err;
 	}

 	ret = io_uring_queue_init(4 * BUFFERS, &ring, 0);
 	if (ret) {
 		fprintf(stderr, "ring create failed: %d\n", ret);
 		goto err;
 	}

 	if (do_io(&ring, fd, do_write))
 		goto err;
 	gettimeofday(&start_tv, NULL);
 	if (do_io(&ring, fd, do_write))
 		goto err;
 	usecs = utime_since_now(&start_tv);

 	if (start_io(&ring, fd, do_write))
 		goto err;
 	/* sleep for 1/3 of the total time, to allow some to start/complete */
 	usleep(usecs / 3);
 	if (start_cancel(&ring, do_partial))
 		goto err;
 	to_wait = BUFFERS;
 	if (do_partial)
 		to_wait += BUFFERS / 2;
 	else
 		to_wait += BUFFERS;
 	if (wait_io(&ring, to_wait, do_partial))
 		goto err;

 	io_uring_queue_exit(&ring);
 	close(fd);
 	return 0;
 err:
 	if (fd != -1)
 		close(fd);
 	return 1;
 }

 static int test_dont_cancel_another_ring(void)
 {
 	struct io_uring ring1, ring2;
 	struct io_uring_cqe *cqe;
 	struct io_uring_sqe *sqe;
 	char buffer[128];
 	int ret, fds[2];
 	struct __kernel_timespec ts = { .tv_sec = 0, .tv_nsec = 100000000, };

 	ret = io_uring_queue_init(8, &ring1, 0);
 	if (ret) {
 		fprintf(stderr, "ring create failed: %d\n", ret);
 		return 1;
 	}
 	ret = io_uring_queue_init(8, &ring2, 0);
 	if (ret) {
 		fprintf(stderr, "ring create failed: %d\n", ret);
 		return 1;
 	}
 	if (pipe(fds)) {
 		perror("pipe");
 		return 1;
 	}

 	sqe = io_uring_get_sqe(&ring1);
 	if (!sqe) {
 		fprintf(stderr, "%s: failed to get sqe\n", __FUNCTION__);
 		return 1;
 	}
 	io_uring_prep_read(sqe, fds[0], buffer, 10, 0);
 	sqe->flags |= IOSQE_ASYNC;
 	sqe->user_data = 1;

 	ret = io_uring_submit(&ring1);
 	if (ret != 1) {
 		fprintf(stderr, "%s: got %d, wanted 1\n", __FUNCTION__, ret);
 		return 1;
 	}

 	/* make sure it doesn't cancel requests of the other ctx */
 	sqe = io_uring_get_sqe(&ring2);
 	if (!sqe) {
 		fprintf(stderr, "%s: failed to get sqe\n", __FUNCTION__);
 		return 1;
 	}
 	io_uring_prep_cancel(sqe, (void *) (unsigned long)1, 0);
 	sqe->user_data = 2;

 	ret = io_uring_submit(&ring2);
 	if (ret != 1) {
 		fprintf(stderr, "%s: got %d, wanted 1\n", __FUNCTION__, ret);
 		return 1;
 	}

 	ret = io_uring_wait_cqe(&ring2, &cqe);
 	if (ret) {
 		fprintf(stderr, "wait_cqe=%d\n", ret);
 		return 1;
 	}
 	if (cqe->user_data != 2 || cqe->res != -ENOENT) {
 		fprintf(stderr, "error: cqe %i: res=%i, but expected -ENOENT\n",
 			(int)cqe->user_data, (int)cqe->res);
 		return 1;
 	}
 	io_uring_cqe_seen(&ring2, cqe);

 	ret = io_uring_wait_cqe_timeout(&ring1, &cqe, &ts);
 	if (ret != -ETIME) {
 		fprintf(stderr, "read got cancelled or wait failed\n");
 		return 1;
 	}
 	io_uring_cqe_seen(&ring1, cqe);

 	close(fds[0]);
 	close(fds[1]);
 	io_uring_queue_exit(&ring1);
 	io_uring_queue_exit(&ring2);
 	return 0;
 }

 static int test_cancel_req_across_fork(void)
 {
 	struct io_uring ring;
 	struct io_uring_cqe *cqe;
 	struct io_uring_sqe *sqe;
 	char buffer[128];
 	int ret, i, fds[2];
 	pid_t p;

 	ret = io_uring_queue_init(8, &ring, 0);
 	if (ret) {
 		fprintf(stderr, "ring create failed: %d\n", ret);
 		return 1;
 	}
 	if (pipe(fds)) {
 		perror("pipe");
 		return 1;
 	}
 	sqe = io_uring_get_sqe(&ring);
 	if (!sqe) {
 		fprintf(stderr, "%s: failed to get sqe\n", __FUNCTION__);
 		return 1;
 	}
 	io_uring_prep_read(sqe, fds[0], buffer, 10, 0);
 	sqe->flags |= IOSQE_ASYNC;
 	sqe->user_data = 1;

 	ret = io_uring_submit(&ring);
 	if (ret != 1) {
 		fprintf(stderr, "%s: got %d, wanted 1\n", __FUNCTION__, ret);
 		return 1;
 	}

 	p = fork();
 	if (p == -1) {
 		fprintf(stderr, "fork() failed\n");
 		return 1;
 	}

 	if (p == 0) {
 		sqe = io_uring_get_sqe(&ring);
 		if (!sqe) {
 			fprintf(stderr, "%s: failed to get sqe\n", __FUNCTION__);
 			return 1;
 		}
 		io_uring_prep_cancel(sqe, (void *) (unsigned long)1, 0);
 		sqe->user_data = 2;

 		ret = io_uring_submit(&ring);
 		if (ret != 1) {
 			fprintf(stderr, "%s: got %d, wanted 1\n", __FUNCTION__, ret);
 			return 1;
 		}

 		for (i = 0; i < 2; ++i) {
 			ret = io_uring_wait_cqe(&ring, &cqe);
 			if (ret) {
 				fprintf(stderr, "wait_cqe=%d\n", ret);
 				return 1;
 			}
 			if ((cqe->user_data == 1 && cqe->res != -EINTR) ||
 			    (cqe->user_data == 2 && cqe->res != -EALREADY)) {
 				fprintf(stderr, "%i %i\n", (int)cqe->user_data, cqe->res);
 				exit(1);
 			}

 			io_uring_cqe_seen(&ring, cqe);
 		}
 		exit(0);
 	} else {
 		int wstatus;

 		if (waitpid(p, &wstatus, 0) == (pid_t)-1) {
 			perror("waitpid()");
 			return 1;
 		}
 		if (!WIFEXITED(wstatus) || WEXITSTATUS(wstatus)) {
 			fprintf(stderr, "child failed %i\n", WEXITSTATUS(wstatus));
 			return 1;
 		}
 	}

 	close(fds[0]);
 	close(fds[1]);
 	io_uring_queue_exit(&ring);
 	return 0;
 }

 static int test_cancel_inflight_exit(void)
 {
 	struct __kernel_timespec ts = { .tv_sec = 1, .tv_nsec = 0, };
 	struct io_uring ring;
 	struct io_uring_cqe *cqe;
 	struct io_uring_sqe *sqe;
 	int ret, i;
 	pid_t p;

 	ret = io_uring_queue_init(8, &ring, 0);
 	if (ret) {
 		fprintf(stderr, "ring create failed: %d\n", ret);
 		return 1;
 	}
 	p = fork();
 	if (p == -1) {
 		fprintf(stderr, "fork() failed\n");
 		return 1;
 	}

 	if (p == 0) {
 		sqe = io_uring_get_sqe(&ring);
 		io_uring_prep_poll_add(sqe, ring.ring_fd, POLLIN);
 		sqe->user_data = 1;
 		sqe->flags |= IOSQE_IO_LINK;

 		sqe = io_uring_get_sqe(&ring);
 		io_uring_prep_timeout(sqe, &ts, 0, 0);
 		sqe->user_data = 2;

 		sqe = io_uring_get_sqe(&ring);
 		io_uring_prep_timeout(sqe, &ts, 0, 0);
 		sqe->user_data = 3;

 		ret = io_uring_submit(&ring);
 		if (ret != 3) {
 			fprintf(stderr, "io_uring_submit() failed %s, ret %i\n", __FUNCTION__, ret);
 			exit(1);
 		}
 		exit(0);
 	} else {
 		int wstatus;

 		if (waitpid(p, &wstatus, 0) == (pid_t)-1) {
 			perror("waitpid()");
 			return 1;
 		}
 		if (!WIFEXITED(wstatus) || WEXITSTATUS(wstatus)) {
 			fprintf(stderr, "child failed %i\n", WEXITSTATUS(wstatus));
 			return 1;
 		}
 	}

 	for (i = 0; i < 3; ++i) {
 		ret = io_uring_wait_cqe(&ring, &cqe);
 		if (ret) {
 			fprintf(stderr, "wait_cqe=%d\n", ret);
 			return 1;
 		}
 		if ((cqe->user_data == 1 && cqe->res != -ECANCELED) ||
 		    (cqe->user_data == 2 && cqe->res != -ECANCELED) ||
 		    (cqe->user_data == 3 && cqe->res != -ETIME)) {
 			fprintf(stderr, "%i %i\n", (int)cqe->user_data, cqe->res);
 			return 1;
 		}
 		io_uring_cqe_seen(&ring, cqe);
 	}

 	io_uring_queue_exit(&ring);
 	return 0;
 }

 static int test_sqpoll_cancel_iowq_requests(void)
 {
 	struct io_uring ring;
 	struct io_uring_sqe *sqe;
 	int ret, fds[2];
 	char buffer[16];

 	ret = io_uring_queue_init(8, &ring, IORING_SETUP_SQPOLL);
 	if (ret) {
 		fprintf(stderr, "ring create failed: %d\n", ret);
 		return 1;
 	}
 	if (pipe(fds)) {
 		perror("pipe");
 		return 1;
 	}
 	/* pin both pipe ends via io-wq */
 	sqe = io_uring_get_sqe(&ring);
 	io_uring_prep_read(sqe, fds[0], buffer, 10, 0);
 	sqe->flags |= IOSQE_ASYNC | IOSQE_IO_LINK;
 	sqe->user_data = 1;

 	sqe = io_uring_get_sqe(&ring);
 	io_uring_prep_write(sqe, fds[1], buffer, 10, 0);
 	sqe->flags |= IOSQE_ASYNC;
 	sqe->user_data = 2;
 	ret = io_uring_submit(&ring);
 	if (ret != 2) {
 		fprintf(stderr, "%s: got %d, wanted 1\n", __FUNCTION__, ret);
 		return 1;
 	}

 	/* wait for sqpoll to kick in and submit before exit */
 	sleep(1);
 	io_uring_queue_exit(&ring);

 	/* close the write end, so if ring is cancelled properly read() fails*/
 	close(fds[1]);
 	ret = read(fds[0], buffer, 10);
 	close(fds[0]);
 	return 0;
 }

 int main(int argc, char *argv[])
 {
 	int i, ret;

 	if (argc > 1)
 		return 0;

 	if (test_dont_cancel_another_ring()) {
 		fprintf(stderr, "test_dont_cancel_another_ring() failed\n");
 		return 1;
 	}

 	if (test_cancel_req_across_fork()) {
 		fprintf(stderr, "test_cancel_req_across_fork() failed\n");
 		return 1;
 	}

 	if (test_cancel_inflight_exit()) {
 		fprintf(stderr, "test_cancel_inflight_exit() failed\n");
 		return 1;
 	}

 	if (test_sqpoll_cancel_iowq_requests()) {
 		fprintf(stderr, "test_sqpoll_cancel_iowq_requests() failed\n");
 		return 1;
 	}

 	t_create_file(".basic-rw", FILE_SIZE);

 	vecs = t_create_buffers(BUFFERS, BS);

 	for (i = 0; i < 4; i++) {
 		int v1 = (i & 1) != 0;
 		int v2 = (i & 2) != 0;

 		ret = test_io_cancel(".basic-rw", v1, v2);
 		if (ret) {
 			fprintf(stderr, "test_io_cancel %d %d failed\n", v1, v2);
 			goto err;
 		}
 	}

 	unlink(".basic-rw");
 	return 0;
 err:
 	unlink(".basic-rw");
 	return 1;
 }
	/* SPDX-License-Identifier: MIT */
	/*
	* Description: Basic IO cancel test
	*/
	#include <errno.h>
	#include <stdio.h>
	#include <unistd.h>
	#include <stdlib.h>
	#include <string.h>
	#include <fcntl.h>
	#include <sys/types.h>
	#include <sys/time.h>
	#include <sys/wait.h>
	#include <sys/poll.h>

	#include "helpers.h"
	#include "liburing.h"

	#define FILE_SIZE (128 * 1024)
	#define BS 4096
	#define BUFFERS (FILE_SIZE / BS)

	static struct iovec *vecs;

	static unsigned long long utime_since(const struct timeval *s,
	const struct timeval *e)
	{
	long long sec, usec;

	sec = e->tv_sec - s->tv_sec;
	usec = (e->tv_usec - s->tv_usec);
	if (sec > 0 && usec < 0) {
	sec--;
	usec += 1000000;
	}

	sec *= 1000000;
	return sec + usec;
	}

	static unsigned long long utime_since_now(struct timeval *tv)
	{
	struct timeval end;

	gettimeofday(&end, NULL);
	return utime_since(tv, &end);
	}

	static int start_io(struct io_uring *ring, int fd, int do_write)
	{
	struct io_uring_sqe *sqe;
	int i, ret;

	for (i = 0; i < BUFFERS; i++) {
	off_t offset;

	sqe = io_uring_get_sqe(ring);
	if (!sqe) {
	fprintf(stderr, "sqe get failed\n");
	goto err;
	}
	offset = BS * (rand() % BUFFERS);
	if (do_write) {
	io_uring_prep_writev(sqe, fd, &vecs[i], 1, offset);
	} else {
	io_uring_prep_readv(sqe, fd, &vecs[i], 1, offset);
	}
	sqe->user_data = i + 1;
	}

	ret = io_uring_submit(ring);
	if (ret != BUFFERS) {
	fprintf(stderr, "submit got %d, wanted %d\n", ret, BUFFERS);
	goto err;
	}

	return 0;
	err:
	return 1;
	}

	static int wait_io(struct io_uring *ring, unsigned nr_io, int do_partial)
	{
	struct io_uring_cqe *cqe;
	int i, ret;

	for (i = 0; i < nr_io; i++) {
	ret = io_uring_wait_cqe(ring, &cqe);
	if (ret) {
	fprintf(stderr, "wait_cqe=%d\n", ret);
	goto err;
	}
	if (do_partial && cqe->user_data) {
	if (!(cqe->user_data & 1)) {
	if (cqe->res != BS) {
	fprintf(stderr, "IO %d wasn't cancelled but got error %d\n", (unsigned) cqe->user_data, cqe->res);
	goto err;
	}
	}
	}
	io_uring_cqe_seen(ring, cqe);
	}
	return 0;
	err:
	return 1;

	}

	static int do_io(struct io_uring *ring, int fd, int do_write)
	{
	if (start_io(ring, fd, do_write))
	return 1;
	if (wait_io(ring, BUFFERS, 0))
	return 1;
	return 0;
	}

	static int start_cancel(struct io_uring *ring, int do_partial)
	{
	struct io_uring_sqe *sqe;
	int i, ret, submitted = 0;

	for (i = 0; i < BUFFERS; i++) {
	if (do_partial && (i & 1))
	continue;
	sqe = io_uring_get_sqe(ring);
	if (!sqe) {
	fprintf(stderr, "sqe get failed\n");
	goto err;
	}
	io_uring_prep_cancel(sqe, (void *) (unsigned long) i + 1, 0);
	sqe->user_data = 0;
	submitted++;
	}

	ret = io_uring_submit(ring);
	if (ret != submitted) {
	fprintf(stderr, "submit got %d, wanted %d\n", ret, submitted);
	goto err;
	}
	return 0;
	err:
	return 1;
	}

	/*
	* Test cancels. If 'do_partial' is set, then we only attempt to cancel half of
	* the submitted IO. This is done to verify that cancelling one piece of IO doesn't
	* impact others.
	*/
	static int test_io_cancel(const char *file, int do_write, int do_partial)
	{
	struct io_uring ring;
	struct timeval start_tv;
	unsigned long usecs;
	unsigned to_wait;
	int fd, ret;

	fd = open(file, O_RDWR \| O_DIRECT);
	if (fd < 0) {
	perror("file open");
	goto err;
	}

	ret = io_uring_queue_init(4 * BUFFERS, &ring, 0);
	if (ret) {
	fprintf(stderr, "ring create failed: %d\n", ret);
	goto err;
	}

	if (do_io(&ring, fd, do_write))
	goto err;
	gettimeofday(&start_tv, NULL);
	if (do_io(&ring, fd, do_write))
	goto err;
	usecs = utime_since_now(&start_tv);

	if (start_io(&ring, fd, do_write))
	goto err;
	/* sleep for 1/3 of the total time, to allow some to start/complete */
	usleep(usecs / 3);
	if (start_cancel(&ring, do_partial))
	goto err;
	to_wait = BUFFERS;
	if (do_partial)
	to_wait += BUFFERS / 2;
	else
	to_wait += BUFFERS;
	if (wait_io(&ring, to_wait, do_partial))
	goto err;

	io_uring_queue_exit(&ring);
	close(fd);
	return 0;
	err:
	if (fd != -1)
	close(fd);
	return 1;
	}

	static int test_dont_cancel_another_ring(void)
	{
	struct io_uring ring1, ring2;
	struct io_uring_cqe *cqe;
	struct io_uring_sqe *sqe;
	char buffer[128];
	int ret, fds[2];
	struct __kernel_timespec ts = { .tv_sec = 0, .tv_nsec = 100000000, };

	ret = io_uring_queue_init(8, &ring1, 0);
	if (ret) {
	fprintf(stderr, "ring create failed: %d\n", ret);
	return 1;
	}
	ret = io_uring_queue_init(8, &ring2, 0);
	if (ret) {
	fprintf(stderr, "ring create failed: %d\n", ret);
	return 1;
	}
	if (pipe(fds)) {
	perror("pipe");
	return 1;
	}

	sqe = io_uring_get_sqe(&ring1);
	if (!sqe) {
	fprintf(stderr, "%s: failed to get sqe\n", __FUNCTION__);
	return 1;
	}
	io_uring_prep_read(sqe, fds[0], buffer, 10, 0);
	sqe->flags \|= IOSQE_ASYNC;
	sqe->user_data = 1;

	ret = io_uring_submit(&ring1);
	if (ret != 1) {
	fprintf(stderr, "%s: got %d, wanted 1\n", __FUNCTION__, ret);
	return 1;
	}

	/* make sure it doesn't cancel requests of the other ctx */
	sqe = io_uring_get_sqe(&ring2);
	if (!sqe) {
	fprintf(stderr, "%s: failed to get sqe\n", __FUNCTION__);
	return 1;
	}
	io_uring_prep_cancel(sqe, (void *) (unsigned long)1, 0);
	sqe->user_data = 2;

	ret = io_uring_submit(&ring2);
	if (ret != 1) {
	fprintf(stderr, "%s: got %d, wanted 1\n", __FUNCTION__, ret);
	return 1;
	}

	ret = io_uring_wait_cqe(&ring2, &cqe);
	if (ret) {
	fprintf(stderr, "wait_cqe=%d\n", ret);
	return 1;
	}
	if (cqe->user_data != 2 \|\| cqe->res != -ENOENT) {
	fprintf(stderr, "error: cqe %i: res=%i, but expected -ENOENT\n",
	(int)cqe->user_data, (int)cqe->res);
	return 1;
	}
	io_uring_cqe_seen(&ring2, cqe);

	ret = io_uring_wait_cqe_timeout(&ring1, &cqe, &ts);
	if (ret != -ETIME) {
	fprintf(stderr, "read got cancelled or wait failed\n");
	return 1;
	}
	io_uring_cqe_seen(&ring1, cqe);

	close(fds[0]);
	close(fds[1]);
	io_uring_queue_exit(&ring1);
	io_uring_queue_exit(&ring2);
	return 0;
	}

	static int test_cancel_req_across_fork(void)
	{
	struct io_uring ring;
	struct io_uring_cqe *cqe;
	struct io_uring_sqe *sqe;
	char buffer[128];
	int ret, i, fds[2];
	pid_t p;

	ret = io_uring_queue_init(8, &ring, 0);
	if (ret) {
	fprintf(stderr, "ring create failed: %d\n", ret);
	return 1;
	}
	if (pipe(fds)) {
	perror("pipe");
	return 1;
	}
	sqe = io_uring_get_sqe(&ring);
	if (!sqe) {
	fprintf(stderr, "%s: failed to get sqe\n", __FUNCTION__);
	return 1;
	}
	io_uring_prep_read(sqe, fds[0], buffer, 10, 0);
	sqe->flags \|= IOSQE_ASYNC;
	sqe->user_data = 1;

	ret = io_uring_submit(&ring);
	if (ret != 1) {
	fprintf(stderr, "%s: got %d, wanted 1\n", __FUNCTION__, ret);
	return 1;
	}

	p = fork();
	if (p == -1) {
	fprintf(stderr, "fork() failed\n");
	return 1;
	}

	if (p == 0) {
	sqe = io_uring_get_sqe(&ring);
	if (!sqe) {
	fprintf(stderr, "%s: failed to get sqe\n", __FUNCTION__);
	return 1;
	}
	io_uring_prep_cancel(sqe, (void *) (unsigned long)1, 0);
	sqe->user_data = 2;

	ret = io_uring_submit(&ring);
	if (ret != 1) {
	fprintf(stderr, "%s: got %d, wanted 1\n", __FUNCTION__, ret);
	return 1;
	}

	for (i = 0; i < 2; ++i) {
	ret = io_uring_wait_cqe(&ring, &cqe);
	if (ret) {
	fprintf(stderr, "wait_cqe=%d\n", ret);
	return 1;
	}
	if ((cqe->user_data == 1 && cqe->res != -EINTR) \|\|
	(cqe->user_data == 2 && cqe->res != -EALREADY)) {
	fprintf(stderr, "%i %i\n", (int)cqe->user_data, cqe->res);
	exit(1);
	}

	io_uring_cqe_seen(&ring, cqe);
	}
	exit(0);
	} else {
	int wstatus;

	if (waitpid(p, &wstatus, 0) == (pid_t)-1) {
	perror("waitpid()");
	return 1;
	}
	if (!WIFEXITED(wstatus) \|\| WEXITSTATUS(wstatus)) {
	fprintf(stderr, "child failed %i\n", WEXITSTATUS(wstatus));
	return 1;
	}
	}

	close(fds[0]);
	close(fds[1]);
	io_uring_queue_exit(&ring);
	return 0;
	}

	static int test_cancel_inflight_exit(void)
	{
	struct __kernel_timespec ts = { .tv_sec = 1, .tv_nsec = 0, };
	struct io_uring ring;
	struct io_uring_cqe *cqe;
	struct io_uring_sqe *sqe;
	int ret, i;
	pid_t p;

	ret = io_uring_queue_init(8, &ring, 0);
	if (ret) {
	fprintf(stderr, "ring create failed: %d\n", ret);
	return 1;
	}
	p = fork();
	if (p == -1) {
	fprintf(stderr, "fork() failed\n");
	return 1;
	}

	if (p == 0) {
	sqe = io_uring_get_sqe(&ring);
	io_uring_prep_poll_add(sqe, ring.ring_fd, POLLIN);
	sqe->user_data = 1;
	sqe->flags \|= IOSQE_IO_LINK;

	sqe = io_uring_get_sqe(&ring);
	io_uring_prep_timeout(sqe, &ts, 0, 0);
	sqe->user_data = 2;

	sqe = io_uring_get_sqe(&ring);
	io_uring_prep_timeout(sqe, &ts, 0, 0);
	sqe->user_data = 3;

	ret = io_uring_submit(&ring);
	if (ret != 3) {
	fprintf(stderr, "io_uring_submit() failed %s, ret %i\n", __FUNCTION__, ret);
	exit(1);
	}
	exit(0);
	} else {
	int wstatus;

	if (waitpid(p, &wstatus, 0) == (pid_t)-1) {
	perror("waitpid()");
	return 1;
	}
	if (!WIFEXITED(wstatus) \|\| WEXITSTATUS(wstatus)) {
	fprintf(stderr, "child failed %i\n", WEXITSTATUS(wstatus));
	return 1;
	}
	}

	for (i = 0; i < 3; ++i) {
	ret = io_uring_wait_cqe(&ring, &cqe);
	if (ret) {
	fprintf(stderr, "wait_cqe=%d\n", ret);
	return 1;
	}
	if ((cqe->user_data == 1 && cqe->res != -ECANCELED) \|\|
	(cqe->user_data == 2 && cqe->res != -ECANCELED) \|\|
	(cqe->user_data == 3 && cqe->res != -ETIME)) {
	fprintf(stderr, "%i %i\n", (int)cqe->user_data, cqe->res);
	return 1;
	}
	io_uring_cqe_seen(&ring, cqe);
	}

	io_uring_queue_exit(&ring);
	return 0;
	}

	static int test_sqpoll_cancel_iowq_requests(void)
	{
	struct io_uring ring;
	struct io_uring_sqe *sqe;
	int ret, fds[2];
	char buffer[16];

	ret = io_uring_queue_init(8, &ring, IORING_SETUP_SQPOLL);
	if (ret) {
	fprintf(stderr, "ring create failed: %d\n", ret);
	return 1;
	}
	if (pipe(fds)) {
	perror("pipe");
	return 1;
	}
	/* pin both pipe ends via io-wq */
	sqe = io_uring_get_sqe(&ring);
	io_uring_prep_read(sqe, fds[0], buffer, 10, 0);
	sqe->flags \|= IOSQE_ASYNC \| IOSQE_IO_LINK;
	sqe->user_data = 1;

	sqe = io_uring_get_sqe(&ring);
	io_uring_prep_write(sqe, fds[1], buffer, 10, 0);
	sqe->flags \|= IOSQE_ASYNC;
	sqe->user_data = 2;
	ret = io_uring_submit(&ring);
	if (ret != 2) {
	fprintf(stderr, "%s: got %d, wanted 1\n", __FUNCTION__, ret);
	return 1;
	}

	/* wait for sqpoll to kick in and submit before exit */
	sleep(1);
	io_uring_queue_exit(&ring);

	/* close the write end, so if ring is cancelled properly read() fails*/
	close(fds[1]);
	ret = read(fds[0], buffer, 10);
	close(fds[0]);
	return 0;
	}

	int main(int argc, char *argv[])
	{
	int i, ret;

	if (argc > 1)
	return 0;

	if (test_dont_cancel_another_ring()) {
	fprintf(stderr, "test_dont_cancel_another_ring() failed\n");
	return 1;
	}

	if (test_cancel_req_across_fork()) {
	fprintf(stderr, "test_cancel_req_across_fork() failed\n");
	return 1;
	}

	if (test_cancel_inflight_exit()) {
	fprintf(stderr, "test_cancel_inflight_exit() failed\n");
	return 1;
	}

	if (test_sqpoll_cancel_iowq_requests()) {
	fprintf(stderr, "test_sqpoll_cancel_iowq_requests() failed\n");
	return 1;
	}

	t_create_file(".basic-rw", FILE_SIZE);

	vecs = t_create_buffers(BUFFERS, BS);

	for (i = 0; i < 4; i++) {
	int v1 = (i & 1) != 0;
	int v2 = (i & 2) != 0;

	ret = test_io_cancel(".basic-rw", v1, v2);
	if (ret) {
	fprintf(stderr, "test_io_cancel %d %d failed\n", v1, v2);
	goto err;
	}
	}

	unlink(".basic-rw");
	return 0;
	err:
	unlink(".basic-rw");
	return 1;
	}