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/* SPDX-License-Identifier: MIT */
/*
* Description: test reading a normal file with incremental buffer
* consumption. Some kernels had a bug where the initial part
* of the buffer got skipped, test for that.
*
*/
#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#include "liburing.h"
#include "helpers.h"
#define BUF_BGID 4
#define BUF_BID 8
static void arm_read(struct io_uring *ring, int fd, int offset)
{
struct io_uring_sqe *sqe;
sqe = io_uring_get_sqe(ring);
io_uring_prep_read(sqe, fd, NULL, 80, offset);
sqe->flags = IOSQE_BUFFER_SELECT;
sqe->buf_group = BUF_BGID;
io_uring_submit(ring);
}
static int create_test_file(const char *fname)
{
char buf[80], c;
int fd, i, ret;
fd = open(fname, O_WRONLY | O_CREAT | O_TRUNC, 0644);
if (fd < 0) {
perror("open");
return T_EXIT_FAIL;
}
c = 'a';
for (i = 0; i < 8; i++) {
memset(buf, c, sizeof(buf));
ret = write(fd, buf, sizeof(buf));
if (ret < 0) {
perror("write");
unlink(fname);
return T_EXIT_FAIL;
} else if (ret != sizeof(buf)) {
fprintf(stderr, "Short write: %d\n", ret);
unlink(fname);
return T_EXIT_FAIL;
}
c++;
}
close(fd);
return 0;
}
int main(int argc, char *argv[])
{
struct io_uring_buf_ring *br;
struct io_uring_params p = { };
struct io_uring_cqe *cqe;
struct io_uring ring;
int tret, ret, fd, i;
char fname[64];
char c = 'a';
char *buf;
void *ptr;
if (argc > 1)
return T_EXIT_SKIP;
sprintf(fname, ".buf-inc-file.%d", getpid());
if (create_test_file(fname))
return T_EXIT_FAIL;
fd = open(fname, O_RDONLY);
if (fd < 0) {
perror("open");
goto err;
}
ret = io_uring_queue_init_params(64, &ring, &p);
if (ret) {
fprintf(stderr, "ring setup failed: %d\n", ret);
goto err;
}
if (posix_memalign((void **) &buf, 4096, 65536))
goto err;
tret = T_EXIT_SKIP;
br = io_uring_setup_buf_ring(&ring, 32, BUF_BGID, IOU_PBUF_RING_INC, &ret);
if (!br) {
if (ret == -EINVAL)
goto out;
fprintf(stderr, "Buffer ring register failed %d\n", ret);
goto err;
}
tret = T_EXIT_PASS;
io_uring_buf_ring_add(br, buf, 65536, BUF_BID, 31, 0);
io_uring_buf_ring_advance(br, 1);
memset(buf, 0, 65536);
ptr = buf;
for (i = 0; i < 4; i++) {
int bid;
arm_read(&ring, fd, i * 80);
ret = io_uring_wait_cqe(&ring, &cqe);
if (ret) {
fprintf(stderr, "wait %d\n", ret);
goto err;
}
if (!(cqe->flags & IORING_CQE_F_BUFFER)) {
fprintf(stderr, "buffer not assigned\n");
goto err;
}
bid = cqe->flags >> IORING_CQE_BUFFER_SHIFT;
if (bid != BUF_BID) {
fprintf(stderr, "got wrong buffer bid %d\n", bid);
goto err;
}
if (cqe->res != 80) {
fprintf(stderr, "bad read size %d\n", ret);
goto err;
}
io_uring_cqe_seen(&ring, cqe);
if (!memchr(ptr, c, cqe->res)) {
fprintf(stderr, "fail buffer check loop %d\n", i);
goto err;
}
c++;
ptr += cqe->res;
}
io_uring_free_buf_ring(&ring, br, 32, BUF_BGID);
io_uring_queue_exit(&ring);
out:
free(buf);
unlink(fname);
return tret;
err:
unlink(fname);
return T_EXIT_FAIL;
}
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