1 /*
2 * Copyright (c) 2016 Oracle and/or its affiliates. All Rights Reserved.
3 *
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License as
6 * published by the Free Software Foundation; either version 2 of
7 * the License, or (at your option) any later version.
8 *
9 * This program is distributed in the hope that it would be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program. If not, see <http://www.gnu.org/licenses/>.
16 *
17 * Author: Alexey Kodanev <alexey.kodanev@oracle.com>
18 *
19 */
20
21 #include <sys/types.h>
22 #include <sys/stat.h>
23 #include <unistd.h>
24 #include <fcntl.h>
25 #include <pthread.h>
26 #include <sched.h>
27
28 #include "lapi/fcntl.h"
29 #include "tst_safe_pthread.h"
30 #include "tst_test.h"
31 #include "fcntl_common.h"
32
33 static int thread_cnt;
34 static const int max_thread_cnt = 32;
35 static const char fname[] = "tst_ofd_locks";
36 const int writes_num = 100;
37 const int write_size = 4096;
38
setup(void)39 static void setup(void)
40 {
41 thread_cnt = tst_ncpus_conf() * 3;
42 if (thread_cnt > max_thread_cnt)
43 thread_cnt = max_thread_cnt;
44 }
45
spawn_threads(pthread_t * id,void * (* thread_fn)(void *))46 static void spawn_threads(pthread_t *id, void *(*thread_fn)(void *))
47 {
48 intptr_t i;
49
50 tst_res(TINFO, "spawning '%d' threads", thread_cnt);
51 for (i = 0; i < thread_cnt; ++i)
52 SAFE_PTHREAD_CREATE(id + i, NULL, thread_fn, (void *)i);
53 }
54
wait_threads(pthread_t * id)55 static void wait_threads(pthread_t *id)
56 {
57 int i;
58
59 tst_res(TINFO, "waiting for '%d' threads", thread_cnt);
60 for (i = 0; i < thread_cnt; ++i)
61 SAFE_PTHREAD_JOIN(id[i], NULL);
62 }
63
thread_fn_01(void * arg)64 void *thread_fn_01(void *arg)
65 {
66 int i;
67 unsigned char buf[write_size];
68 int fd = SAFE_OPEN(fname, O_RDWR);
69
70 memset(buf, (intptr_t)arg, write_size);
71
72 struct flock64 lck = {
73 .l_whence = SEEK_SET,
74 .l_start = 0,
75 .l_len = 1,
76 };
77
78 for (i = 0; i < writes_num; ++i) {
79 lck.l_type = F_WRLCK;
80 my_fcntl(fd, F_OFD_SETLKW, &lck);
81
82 SAFE_LSEEK(fd, 0, SEEK_END);
83 SAFE_WRITE(1, fd, buf, write_size);
84
85 lck.l_type = F_UNLCK;
86 my_fcntl(fd, F_OFD_SETLKW, &lck);
87
88 sched_yield();
89 }
90
91 SAFE_CLOSE(fd);
92
93 return NULL;
94 }
95
test01(void)96 static void test01(void)
97 {
98 intptr_t i;
99 int k;
100 pthread_t id[thread_cnt];
101 int res[thread_cnt];
102 unsigned char buf[write_size];
103
104 tst_res(TINFO, "write to a file inside threads with OFD locks");
105
106 int fd = SAFE_OPEN(fname, O_CREAT | O_TRUNC | O_RDWR, 0600);
107
108 memset(res, 0, sizeof(res));
109
110 spawn_threads(id, thread_fn_01);
111 wait_threads(id);
112
113 tst_res(TINFO, "verifying file's data");
114 SAFE_LSEEK(fd, 0, SEEK_SET);
115 for (i = 0; i < writes_num * thread_cnt; ++i) {
116 SAFE_READ(1, fd, buf, write_size);
117
118 if (buf[0] >= thread_cnt) {
119 tst_res(TFAIL, "unexpected data read");
120 return;
121 }
122
123 ++res[buf[0]];
124
125 for (k = 1; k < write_size; ++k) {
126 if (buf[0] != buf[k]) {
127 tst_res(TFAIL, "unexpected data read");
128 return;
129 }
130 }
131 }
132
133 for (i = 0; i < thread_cnt; ++i) {
134 if (res[i] != writes_num) {
135 tst_res(TFAIL, "corrupted data found");
136 return;
137 }
138 }
139 SAFE_CLOSE(fd);
140
141 tst_res(TPASS, "OFD locks synchronized access between threads");
142 }
143
144 static struct tst_test test = {
145 .min_kver = "3.15.0",
146 .needs_tmpdir = 1,
147 .test_all = test01,
148 .setup = setup
149 };
150