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/* SPDX-License-Identifier: MIT */
/*
* Description: read /proc/kallsyms. Mostly just here so that fops->read() can
* get exercised, with and without registered buffers
*/
#include <errno.h>
#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#include <fcntl.h>
#include <sys/types.h>
#include <poll.h>
#include <sys/eventfd.h>
#include <sys/resource.h>
#include "helpers.h"
#include "liburing.h"
#define FILE_SIZE (8 * 1024)
#define BS 8192
#define BUFFERS (FILE_SIZE / BS)
static struct iovec *vecs;
static int warned;
static int __test_io(const char *file, struct io_uring *ring, int fixed, int nonvec)
{
struct io_uring_sqe *sqe;
struct io_uring_cqe *cqe;
int open_flags;
int i, fd = -1, ret;
off_t offset;
open_flags = O_RDONLY;
if (fixed) {
ret = t_register_buffers(ring, vecs, BUFFERS);
if (ret == T_SETUP_SKIP)
return 0;
if (ret != T_SETUP_OK) {
fprintf(stderr, "buffer reg failed: %d\n", ret);
goto err;
}
}
fd = open(file, open_flags);
if (fd < 0) {
if (errno == EINVAL || errno == EPERM || errno == ENOENT)
return 0;
perror("file open");
goto err;
}
offset = 0;
for (i = 0; i < BUFFERS; i++) {
int do_fixed = fixed;
sqe = io_uring_get_sqe(ring);
if (!sqe) {
fprintf(stderr, "sqe get failed\n");
goto err;
}
if (fixed && (i & 1))
do_fixed = 0;
if (do_fixed) {
io_uring_prep_read_fixed(sqe, fd, vecs[i].iov_base,
vecs[i].iov_len, offset, i);
} else if (nonvec) {
io_uring_prep_read(sqe, fd, vecs[i].iov_base,
vecs[i].iov_len, offset);
} else {
io_uring_prep_readv(sqe, fd, &vecs[i], 1, offset);
}
sqe->user_data = i;
offset += BS;
}
ret = io_uring_submit(ring);
if (ret != BUFFERS) {
fprintf(stderr, "submit got %d, wanted %d\n", ret, BUFFERS);
goto err;
}
for (i = 0; i < BUFFERS; i++) {
ret = io_uring_wait_cqe(ring, &cqe);
if (ret) {
fprintf(stderr, "wait_cqe=%d\n", ret);
goto err;
}
if (cqe->res == -EINVAL && nonvec) {
if (!warned) {
fprintf(stdout, "Non-vectored IO not "
"supported, skipping\n");
warned = 1;
}
}
io_uring_cqe_seen(ring, cqe);
}
if (fixed) {
ret = io_uring_unregister_buffers(ring);
if (ret) {
fprintf(stderr, "buffer unreg failed: %d\n", ret);
goto err;
}
}
close(fd);
return 0;
err:
if (fd != -1)
close(fd);
return 1;
}
static int test_io(const char *file, int fixed, int nonvec)
{
struct io_uring ring;
int ret, ring_flags = 0;
ret = t_create_ring(64, &ring, ring_flags);
if (ret == T_SETUP_SKIP)
return 0;
if (ret != T_SETUP_OK) {
fprintf(stderr, "ring create failed: %d\n", ret);
return 1;
}
ret = __test_io(file, &ring, fixed, nonvec);
io_uring_queue_exit(&ring);
return ret;
}
static int has_nonvec_read(void)
{
struct io_uring_probe *p;
struct io_uring ring;
int ret;
ret = io_uring_queue_init(1, &ring, 0);
if (ret) {
fprintf(stderr, "queue init failed: %d\n", ret);
exit(ret);
}
p = t_calloc(1, sizeof(*p) + 256 * sizeof(struct io_uring_probe_op));
ret = io_uring_register_probe(&ring, p, 256);
/* if we don't have PROBE_REGISTER, we don't have OP_READ/WRITE */
if (ret == -EINVAL) {
out:
io_uring_queue_exit(&ring);
free(p);
return 0;
} else if (ret) {
fprintf(stderr, "register_probe: %d\n", ret);
goto out;
}
if (p->ops_len <= IORING_OP_READ)
goto out;
if (!(p->ops[IORING_OP_READ].flags & IO_URING_OP_SUPPORTED))
goto out;
io_uring_queue_exit(&ring);
free(p);
return 1;
}
int main(int argc, char *argv[])
{
int ret, nonvec;
if (argc > 1)
return T_EXIT_SKIP;
vecs = t_create_buffers(BUFFERS, BS);
/* if we don't have nonvec read, skip testing that */
nonvec = has_nonvec_read();
if (nonvec) {
ret = test_io("/proc/kallsyms", 0, 0);
if (ret)
goto err;
}
ret = test_io("/proc/kallsyms", 0, 1);
if (ret)
goto err;
if (nonvec) {
ret = test_io("/proc/kallsyms", 1, 0);
if (ret)
goto err;
}
ret = test_io("/proc/kallsyms", 1, 1);
if (ret)
goto err;
return 0;
err:
fprintf(stderr, "Reading kallsyms failed\n");
return 1;
}
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