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