lustre/tests/openclose.c

   1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
   2  * vim:expandtab:shiftwidth=8:tabstop=8:
   3  */
   4
   5 /* for O_DIRECT */
   6 #define _GNU_SOURCE
   7
   8 #include <stdlib.h>
   9 #include <stdio.h>
  10 #include <unistd.h>
  11 #include <sys/types.h>
  12 #include <sys/stat.h>
  13 #include <fcntl.h>
  14 #include <errno.h>
  15 #include <string.h>
  16 #include <sys/wait.h>
  17 #include <sys/ioctl.h>
  18
  19 #include <lustre/lustre_user.h>
  20 #ifndef O_DIRECT
  21 #define O_DIRECT 0
  22 #endif
  23
  24 int main(int argc, char *argv[])
  25 {
  26         char filename[1024];
  27         unsigned long count, i;
  28         int thread = 0;
  29         int threads = 0;
  30         int rc = 0;
  31         int fd, ioctl_flags = 0;
  32
  33         if (argc < 3 || argc > 4) {
  34                 fprintf(stderr, "usage: %s <filename> <iterations> [threads]\n",
  35                         argv[0]);
  36                 exit(1);
  37         }
  38
  39         count = strtoul(argv[2], NULL, 0);
  40         if (argc == 4)
  41                 threads = strtoul(argv[3], NULL, 0);
  42
  43         for (i = 1; i <= threads; i++) {
  44                 rc = fork();
  45                 if (rc < 0) {
  46                         fprintf(stderr, "error: %s: #%ld - %s\n", argv[0], i,
  47                                 strerror(rc = errno));
  48                         break;
  49                 } else if (rc == 0) {
  50                         thread = i;
  51                         argv[2] = "--device";
  52                         break;
  53                 } else
  54                         printf("%s: thread #%ld (PID %d) started\n",
  55                                argv[0], i, rc);
  56                 rc = 0;
  57         }
  58
  59         if (threads && thread == 0) {        /* parent process */
  60                 int live_threads = threads;
  61
  62                 while (live_threads > 0) {
  63                         int status;
  64                         pid_t ret;
  65
  66                         ret = waitpid(0, &status, 0);
  67                         if (ret == 0)
  68                                 continue;
  69
  70                         if (ret < 0) {
  71                                 if (!rc)
  72                                         rc = errno;
  73                                 fprintf(stderr, "error: %s: wait - %s\n",
  74                                         argv[0], strerror(rc));
  75                         } else {
  76                                 /*
  77                                  * This is a hack.  We _should_ be able to use
  78                                  * WIFEXITED(status) to see if there was an
  79                                  * error, but it appears to be broken and it
  80                                  * always returns 1 (OK).  See wait(2).
  81                                  */
  82                                 int err = WEXITSTATUS(status);
  83                                 if (err || WIFSIGNALED(status))
  84                                         fprintf(stderr,
  85                                                 "%s: PID %d had rc=%d\n",
  86                                                 argv[0], ret, err);
  87                                 if (!rc)
  88                                         rc = err;
  89                         }
  90                         live_threads--;
  91                 }
  92         } else {
  93                 if (threads)
  94                         sprintf(filename, "%s-%d", argv[1], thread);
  95                 else
  96                         strcpy(filename, argv[1]);
  97
  98                 fd = open(filename, O_RDWR|O_CREAT, 0644);
  99                 if (fd < 0) {
 100                         rc = errno;
 101                         fprintf(stderr, "open(%s, O_CREAT): %s\n", filename,
 102                                 strerror(rc));
 103                         exit(rc);
 104                 }
 105                 if (close(fd) < 0) {
 106                         rc = errno;
 107                         fprintf(stderr, "close(): %s\n", strerror(rc));
 108                         goto unlink;
 109                 }
 110
 111                 for (i = 0; i < count; i++) {
 112                         fd = open(filename, O_RDWR|O_LARGEFILE|O_DIRECT);
 113                         if (fd < 0) {
 114                                 rc = errno;
 115                                 fprintf(stderr, "open(%s, O_RDWR): %s\n",
 116                                         filename, strerror(rc));
 117                                 break;
 118                         }
 119                         if (ioctl(fd, LL_IOC_SETFLAGS, &ioctl_flags) < 0 &&
 120                             errno != ENOTTY) {
 121                                 rc = errno;
 122                                 fprintf(stderr, "ioctl(): %s\n", strerror(rc));
 123                                 break;
 124                         }
 125                         if (close(fd) < 0) {
 126                                 rc = errno;
 127                                 fprintf(stderr, "close(): %s\n", strerror(rc));
 128                                 break;
 129                         }
 130                 }
 131         unlink:
 132                 if (unlink(filename) < 0) {
 133                         rc = errno;
 134                         fprintf(stderr, "unlink(%s): %s\n", filename,
 135                                 strerror(rc));
 136                 }
 137                 if (threads)
 138                         printf("Thread %d done: rc = %d\n", thread, rc);
 139                 else
 140                         printf("Done: rc = %d\n", rc);
 141         }
 142         return rc;
 143 }