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
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
|
/* SPDX-License-Identifier: MIT */
/*
* Test reads that will punt to blocking context, with immediate overwrite
* of iovec->iov_base to NULL. If the kernel doesn't properly handle
* reuse of the iovec, we should get -EFAULT.
*/
#include <unistd.h>
#include <fcntl.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <pthread.h>
#include <sys/time.h>
#include "helpers.h"
#include "liburing.h"
#define STR_SIZE 32768
#define FILE_SIZE 65536
struct thread_data {
int fd1, fd2;
volatile int do_exit;
};
static void *flusher(void *__data)
{
struct thread_data *data = __data;
int i = 0;
while (!data->do_exit) {
posix_fadvise(data->fd1, 0, FILE_SIZE, POSIX_FADV_DONTNEED);
posix_fadvise(data->fd2, 0, FILE_SIZE, POSIX_FADV_DONTNEED);
usleep(10);
i++;
}
return NULL;
}
static char str1[STR_SIZE];
static char str2[STR_SIZE];
static struct io_uring ring;
static int no_stable;
static int prep(int fd, char *str, int split, int async)
{
struct io_uring_sqe *sqe;
struct iovec iovs[16];
int ret, i;
if (split) {
int vsize = STR_SIZE / 16;
void *ptr = str;
for (i = 0; i < 16; i++) {
iovs[i].iov_base = ptr;
iovs[i].iov_len = vsize;
ptr += vsize;
}
} else {
iovs[0].iov_base = str;
iovs[0].iov_len = STR_SIZE;
}
sqe = io_uring_get_sqe(&ring);
io_uring_prep_readv(sqe, fd, iovs, split ? 16 : 1, 0);
sqe->user_data = fd;
if (async)
sqe->flags = IOSQE_ASYNC;
ret = io_uring_submit(&ring);
if (ret != 1) {
fprintf(stderr, "submit got %d\n", ret);
return 1;
}
if (split) {
for (i = 0; i < 16; i++)
iovs[i].iov_base = NULL;
} else {
iovs[0].iov_base = NULL;
}
return 0;
}
static int wait_nr(int nr)
{
int i, ret;
for (i = 0; i < nr; i++) {
struct io_uring_cqe *cqe;
ret = io_uring_wait_cqe(&ring, &cqe);
if (ret)
return ret;
if (cqe->res < 0) {
fprintf(stderr, "cqe->res=%d\n", cqe->res);
return 1;
}
io_uring_cqe_seen(&ring, cqe);
}
return 0;
}
static unsigned long long mtime_since(const struct timeval *s,
const struct timeval *e)
{
long long sec, usec;
sec = e->tv_sec - s->tv_sec;
usec = (e->tv_usec - s->tv_usec);
if (sec > 0 && usec < 0) {
sec--;
usec += 1000000;
}
sec *= 1000;
usec /= 1000;
return sec + usec;
}
static unsigned long long mtime_since_now(struct timeval *tv)
{
struct timeval end;
gettimeofday(&end, NULL);
return mtime_since(tv, &end);
}
static int test_reuse(int argc, char *argv[], int split, int async)
{
struct thread_data data;
struct io_uring_params p = { };
int fd1, fd2, ret, i;
struct timeval tv;
pthread_t thread;
char *fname1 = ".reuse.1";
int do_unlink = 1;
void *tret;
if (argc > 1) {
fname1 = argv[1];
do_unlink = 0;
}
ret = io_uring_queue_init_params(32, &ring, &p);
if (ret) {
fprintf(stderr, "io_uring_queue_init: %d\n", ret);
return 1;
}
if (!(p.features & IORING_FEAT_SUBMIT_STABLE)) {
fprintf(stdout, "FEAT_SUBMIT_STABLE not there, skipping\n");
no_stable = 1;
return 0;
}
if (do_unlink)
t_create_file(fname1, FILE_SIZE);
t_create_file(".reuse.2", FILE_SIZE);
fd1 = open(fname1, O_RDONLY);
if (fd1 < 0) {
perror("open fname1");
goto err;
}
fd2 = open(".reuse.2", O_RDONLY);
if (fd2 < 0) {
perror("open .reuse.2");
goto err;
}
data.fd1 = fd1;
data.fd2 = fd2;
data.do_exit = 0;
pthread_create(&thread, NULL, flusher, &data);
usleep(10000);
gettimeofday(&tv, NULL);
for (i = 0; i < 1000; i++) {
ret = prep(fd1, str1, split, async);
if (ret) {
fprintf(stderr, "prep1 failed: %d\n", ret);
goto err;
}
ret = prep(fd2, str2, split, async);
if (ret) {
fprintf(stderr, "prep1 failed: %d\n", ret);
goto err;
}
ret = wait_nr(2);
if (ret) {
fprintf(stderr, "wait_nr: %d\n", ret);
goto err;
}
if (mtime_since_now(&tv) > 5000)
break;
}
data.do_exit = 1;
pthread_join(thread, &tret);
close(fd2);
close(fd1);
io_uring_queue_exit(&ring);
if (do_unlink)
unlink(fname1);
unlink(".reuse.2");
return 0;
err:
io_uring_queue_exit(&ring);
if (do_unlink)
unlink(fname1);
unlink(".reuse.2");
return 1;
}
int main(int argc, char *argv[])
{
int ret, i;
for (i = 0; i < 4; i++) {
int split, async;
split = (i & 1) != 0;
async = (i & 2) != 0;
ret = test_reuse(argc, argv, split, async);
if (ret) {
fprintf(stderr, "test_reuse %d %d failed\n", split, async);
return ret;
}
if (no_stable)
break;
}
return 0;
}
|
