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
32 static int thread_cnt;
33 static const int max_thread_cnt = 32;
34 static const char fname[] = "tst_ofd_locks";
35 const int writes_num = 100;
36 const int write_size = 4096;
37
setup(void)38 static void setup(void)
39 {
40 thread_cnt = tst_ncpus_conf() * 3;
41 if (thread_cnt > max_thread_cnt)
42 thread_cnt = max_thread_cnt;
43 }
44
spawn_threads(pthread_t * id,void * (* thread_fn)(void *))45 static void spawn_threads(pthread_t *id, void *(*thread_fn)(void *))
46 {
47 intptr_t i;
48
49 tst_res(TINFO, "spawning '%d' threads", thread_cnt);
50 for (i = 0; i < thread_cnt; ++i)
51 SAFE_PTHREAD_CREATE(id + i, NULL, thread_fn, (void *)i);
52 }
53
wait_threads(pthread_t * id)54 static void wait_threads(pthread_t *id)
55 {
56 int i;
57
58 tst_res(TINFO, "waiting for '%d' threads", thread_cnt);
59 for (i = 0; i < thread_cnt; ++i)
60 SAFE_PTHREAD_JOIN(id[i], NULL);
61 }
62
thread_fn_01(void * arg)63 void *thread_fn_01(void *arg)
64 {
65 int i;
66 unsigned char buf[write_size];
67 int fd = SAFE_OPEN(fname, O_RDWR);
68
69 memset(buf, (intptr_t)arg, write_size);
70
71 struct flock64 lck = {
72 .l_whence = SEEK_SET,
73 .l_start = 0,
74 .l_len = 1,
75 };
76
77 for (i = 0; i < writes_num; ++i) {
78 lck.l_type = F_WRLCK;
79 SAFE_FCNTL(fd, F_OFD_SETLKW, &lck);
80
81 SAFE_LSEEK(fd, 0, SEEK_END);
82 SAFE_WRITE(1, fd, buf, write_size);
83
84 lck.l_type = F_UNLCK;
85 SAFE_FCNTL(fd, F_OFD_SETLKW, &lck);
86
87 sched_yield();
88 }
89
90 SAFE_CLOSE(fd);
91
92 return NULL;
93 }
94
test01(void)95 static void test01(void)
96 {
97 intptr_t i;
98 int k;
99 pthread_t id[thread_cnt];
100 int res[thread_cnt];
101 unsigned char buf[write_size];
102
103 tst_res(TINFO, "write to a file inside threads with OFD locks");
104
105 int fd = SAFE_OPEN(fname, O_CREAT | O_TRUNC | O_RDWR, 0600);
106
107 memset(res, 0, sizeof(res));
108
109 spawn_threads(id, thread_fn_01);
110 wait_threads(id);
111
112 tst_res(TINFO, "verifying file's data");
113 SAFE_LSEEK(fd, 0, SEEK_SET);
114 for (i = 0; i < writes_num * thread_cnt; ++i) {
115 SAFE_READ(1, fd, buf, write_size);
116
117 if (buf[0] >= thread_cnt) {
118 tst_res(TFAIL, "unexpected data read");
119 return;
120 }
121
122 ++res[buf[0]];
123
124 for (k = 1; k < write_size; ++k) {
125 if (buf[0] != buf[k]) {
126 tst_res(TFAIL, "unexpected data read");
127 return;
128 }
129 }
130 }
131
132 for (i = 0; i < thread_cnt; ++i) {
133 if (res[i] != writes_num) {
134 tst_res(TFAIL, "corrupted data found");
135 return;
136 }
137 }
138 SAFE_CLOSE(fd);
139
140 tst_res(TPASS, "OFD locks synchronized access between threads");
141 }
142
143 static struct tst_test test = {
144 .min_kver = "3.15.0",
145 .needs_tmpdir = 1,
146 .test_all = test01,
147 .setup = setup
148 };
149