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 (at) 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 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 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 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 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 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
