1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
|
#include "../config-host.h"
/* 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;
}
|
