io_uring: kill io_uring userspace examples

There are tons of io_uring tests and examples in liburing and on the
Internet. If you're looking for a benchmark, io_uring-bench.c is just an
acutely outdated version of fio/io_uring. And for basic condensed init
template for likes of selftests take a peek at io_uring_zerocopy_tx.c.

Kill tools/io_uring/, it's a burden keeping it here.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/7c740701d3b475dcad8c92602a551044f72176b4.1691543666.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>

1 files changed, 0 insertions, 283 deletions

diff --git a/tools/io_uring/io_uring-cp.c b/tools/io_uring/io_uring-cp.c
deleted file mode 100644
index d9bd6f5f8f46..000000000000
--- a/tools/io_uring/io_uring-cp.c
+++ /dev/null
@@ -1,283 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0
-/*
- * Simple test program that demonstrates a file copy through io_uring. This
- * uses the API exposed by liburing.
- *
- * Copyright (C) 2018-2019 Jens Axboe
- */
-#include <stdio.h>
-#include <fcntl.h>
-#include <string.h>
-#include <stdlib.h>
-#include <unistd.h>
-#include <assert.h>
-#include <errno.h>
-#include <inttypes.h>
-#include <sys/types.h>
-#include <sys/stat.h>
-#include <sys/ioctl.h>
-
-#include "liburing.h"
-
-#define QD	64
-#define BS	(32*1024)
-
-static int infd, outfd;
-
-struct io_data {
-	int read;
-	off_t first_offset, offset;
-	size_t first_len;
-	struct iovec iov;
-};
-
-static int setup_context(unsigned entries, struct io_uring *ring)
-{
-	int ret;
-
-	ret = io_uring_queue_init(entries, ring, 0);
-	if (ret < 0) {
-		fprintf(stderr, "queue_init: %s\n", strerror(-ret));
-		return -1;
-	}
-
-	return 0;
-}
-
-static int get_file_size(int fd, off_t *size)
-{
-	struct stat st;
-
-	if (fstat(fd, &st) < 0)
-		return -1;
-	if (S_ISREG(st.st_mode)) {
-		*size = st.st_size;
-		return 0;
-	} else if (S_ISBLK(st.st_mode)) {
-		unsigned long long bytes;
-
-		if (ioctl(fd, BLKGETSIZE64, &bytes) != 0)
-			return -1;
-
-		*size = bytes;
-		return 0;
-	}
-
-	return -1;
-}
-
-static void queue_prepped(struct io_uring *ring, struct io_data *data)
-{
-	struct io_uring_sqe *sqe;
-
-	sqe = io_uring_get_sqe(ring);
-	assert(sqe);
-
-	if (data->read)
-		io_uring_prep_readv(sqe, infd, &data->iov, 1, data->offset);
-	else
-		io_uring_prep_writev(sqe, outfd, &data->iov, 1, data->offset);
-
-	io_uring_sqe_set_data(sqe, data);
-}
-
-static int queue_read(struct io_uring *ring, off_t size, off_t offset)
-{
-	struct io_uring_sqe *sqe;
-	struct io_data *data;
-
-	data = malloc(size + sizeof(*data));
-	if (!data)
-		return 1;
-
-	sqe = io_uring_get_sqe(ring);
-	if (!sqe) {
-		free(data);
-		return 1;
-	}
-
-	data->read = 1;
-	data->offset = data->first_offset = offset;
-
-	data->iov.iov_base = data + 1;
-	data->iov.iov_len = size;
-	data->first_len = size;
-
-	io_uring_prep_readv(sqe, infd, &data->iov, 1, offset);
-	io_uring_sqe_set_data(sqe, data);
-	return 0;
-}
-
-static void queue_write(struct io_uring *ring, struct io_data *data)
-{
-	data->read = 0;
-	data->offset = data->first_offset;
-
-	data->iov.iov_base = data + 1;
-	data->iov.iov_len = data->first_len;
-
-	queue_prepped(ring, data);
-	io_uring_submit(ring);
-}
-
-static int copy_file(struct io_uring *ring, off_t insize)
-{
-	unsigned long reads, writes;
-	struct io_uring_cqe *cqe;
-	off_t write_left, offset;
-	int ret;
-
-	write_left = insize;
-	writes = reads = offset = 0;
-
-	while (insize || write_left) {
-		int had_reads, got_comp;
-
-		/*
-		 * Queue up as many reads as we can
-		 */
-		had_reads = reads;
-		while (insize) {
-			off_t this_size = insize;
-
-			if (reads + writes >= QD)
-				break;
-			if (this_size > BS)
-				this_size = BS;
-			else if (!this_size)
-				break;
-
-			if (queue_read(ring, this_size, offset))
-				break;
-
-			insize -= this_size;
-			offset += this_size;
-			reads++;
-		}
-
-		if (had_reads != reads) {
-			ret = io_uring_submit(ring);
-			if (ret < 0) {
-				fprintf(stderr, "io_uring_submit: %s\n", strerror(-ret));
-				break;
-			}
-		}
-
-		/*
-		 * Queue is full at this point. Find at least one completion.
-		 */
-		got_comp = 0;
-		while (write_left) {
-			struct io_data *data;
-
-			if (!got_comp) {
-				ret = io_uring_wait_cqe(ring, &cqe);
-				got_comp = 1;
-			} else {
-				ret = io_uring_peek_cqe(ring, &cqe);
-				if (ret == -EAGAIN) {
-					cqe = NULL;
-					ret = 0;
-				}
-			}
-			if (ret < 0) {
-				fprintf(stderr, "io_uring_peek_cqe: %s\n",
-							strerror(-ret));
-				return 1;
-			}
-			if (!cqe)
-				break;
-
-			data = io_uring_cqe_get_data(cqe);
-			if (cqe->res < 0) {
-				if (cqe->res == -EAGAIN) {
-					queue_prepped(ring, data);
-					io_uring_cqe_seen(ring, cqe);
-					continue;
-				}
-				fprintf(stderr, "cqe failed: %s\n",
-						strerror(-cqe->res));
-				return 1;
-			} else if (cqe->res != data->iov.iov_len) {
-				/* Short read/write, adjust and requeue */
-				data->iov.iov_base += cqe->res;
-				data->iov.iov_len -= cqe->res;
-				data->offset += cqe->res;
-				queue_prepped(ring, data);
-				io_uring_cqe_seen(ring, cqe);
-				continue;
-			}
-
-			/*
-			 * All done. if write, nothing else to do. if read,
-			 * queue up corresponding write.
-			 */
-			if (data->read) {
-				queue_write(ring, data);
-				write_left -= data->first_len;
-				reads--;
-				writes++;
-			} else {
-				free(data);
-				writes--;
-			}
-			io_uring_cqe_seen(ring, cqe);
-		}
-	}
-
-	/* wait out pending writes */
-	while (writes) {
-		struct io_data *data;
-
-		ret = io_uring_wait_cqe(ring, &cqe);
-		if (ret) {
-			fprintf(stderr, "wait_cqe=%d\n", ret);
-			return 1;
-		}
-		if (cqe->res < 0) {
-			fprintf(stderr, "write res=%d\n", cqe->res);
-			return 1;
-		}
-		data = io_uring_cqe_get_data(cqe);
-		free(data);
-		writes--;
-		io_uring_cqe_seen(ring, cqe);
-	}
-
-	return 0;
-}
-
-int main(int argc, char *argv[])
-{
-	struct io_uring ring;
-	off_t insize;
-	int ret;
-
-	if (argc < 3) {
-		printf("%s: infile outfile\n", argv[0]);
-		return 1;
-	}
-
-	infd = open(argv[1], O_RDONLY);
-	if (infd < 0) {
-		perror("open infile");
-		return 1;
-	}
-	outfd = open(argv[2], O_WRONLY | O_CREAT | O_TRUNC, 0644);
-	if (outfd < 0) {
-		perror("open outfile");
-		return 1;
-	}
-
-	if (setup_context(QD, &ring))
-		return 1;
-	if (get_file_size(infd, &insize))
-		return 1;
-
-	ret = copy_file(&ring, insize);
-
-	close(infd);
-	close(outfd);
-	io_uring_queue_exit(&ring);
-	return ret;
-}