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/* SPDX-License-Identifier: MIT */
/*
* Description: link <open file><read from file><close file> with an existing
* file present in the opened slot, verifying that we get the new file
* rather than the old one.
*
*/
#include <errno.h>
#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#include <fcntl.h>
#include "liburing.h"
#include "helpers.h"
#define MAX_FILES 8
#define FNAME1 ".slot.reuse.1"
#define FNAME2 ".slot.reuse.2"
#define PAT1 0xaa
#define PAT2 0x55
#define BSIZE 4096
static int test(struct io_uring *ring)
{
struct io_uring_cqe *cqe;
struct io_uring_sqe *sqe;
char buf[BSIZE];
int ret, i;
/* open FNAME1 in slot 0 */
sqe = io_uring_get_sqe(ring);
io_uring_prep_openat_direct(sqe, AT_FDCWD, FNAME1, O_RDONLY, 0, 0);
sqe->user_data = 1;
ret = io_uring_submit(ring);
if (ret != 1) {
fprintf(stderr, "sqe submit failed: %d\n", ret);
goto err;
}
ret = io_uring_wait_cqe(ring, &cqe);
if (ret < 0) {
fprintf(stderr, "wait completion %d\n", ret);
goto err;
}
if (cqe->res != 0) {
fprintf(stderr, "open res %d\n", ret);
goto err;
}
io_uring_cqe_seen(ring, cqe);
/*
* Now open FNAME2 in that same slot, verifying we get data from
* FNAME2 and not FNAME1.
*/
sqe = io_uring_get_sqe(ring);
io_uring_prep_openat_direct(sqe, AT_FDCWD, FNAME2, O_RDONLY, 0, 0);
sqe->flags |= IOSQE_IO_LINK;
sqe->user_data = 2;
sqe = io_uring_get_sqe(ring);
io_uring_prep_read(sqe, 0, buf, sizeof(buf), 0);
sqe->flags |= IOSQE_FIXED_FILE;
sqe->flags |= IOSQE_IO_LINK;
sqe->user_data = 3;
sqe = io_uring_get_sqe(ring);
io_uring_prep_close_direct(sqe, 0);
sqe->user_data = 4;
ret = io_uring_submit(ring);
if (ret != 3) {
fprintf(stderr, "sqe submit failed: %d\n", ret);
goto err;
}
for (i = 0; i < 3; i++) {
ret = io_uring_wait_cqe(ring, &cqe);
if (ret < 0) {
fprintf(stderr, "wait completion %d\n", ret);
goto err;
}
switch (cqe->user_data) {
case 2:
if (cqe->res) {
fprintf(stderr, "bad open %d\n", cqe->res);
goto err;
}
break;
case 3:
if (cqe->res != sizeof(buf)) {
fprintf(stderr, "bad read %d\n", cqe->res);
goto err;
}
break;
case 4:
if (cqe->res) {
fprintf(stderr, "bad close %d\n", cqe->res);
goto err;
}
break;
}
io_uring_cqe_seen(ring, cqe);
}
for (i = 0; i < sizeof(buf); i++) {
if (buf[i] == PAT2)
continue;
fprintf(stderr, "Bad pattern %x at %d\n", buf[i], i);
goto err;
}
return 0;
err:
return 1;
}
int main(int argc, char *argv[])
{
struct io_uring ring;
struct io_uring_params p = { };
int ret, files[MAX_FILES];
if (argc > 1)
return 0;
ret = io_uring_queue_init_params(8, &ring, &p);
if (ret) {
fprintf(stderr, "ring setup failed: %d\n", ret);
return 1;
}
if (!(p.features & IORING_FEAT_CQE_SKIP))
return 0;
memset(files, -1, sizeof(files));
ret = io_uring_register_files(&ring, files, ARRAY_SIZE(files));
if (ret) {
fprintf(stderr, "Failed registering files\n");
return 1;
}
t_create_file_pattern(FNAME1, 4096, PAT1);
t_create_file_pattern(FNAME2, 4096, PAT2);
ret = test(&ring);
if (ret) {
fprintf(stderr, "test failed\n");
goto err;
}
unlink(FNAME1);
unlink(FNAME2);
return 0;
err:
unlink(FNAME1);
unlink(FNAME2);
return 1;
}
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