usr.sbin/mdconfig/mdconfig.c

   1 /*      $NetBSD: mdconfig.c,v 1.4 2005/11/01 01:42:29 chs Exp $ */
   2
   3 /*
   4  * Copyright (c) 1995 Gordon W. Ross
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  *
  16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  17  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  18  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  19  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  20  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  21  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  22  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  23  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  24  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  25  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  26  */
  27
  28 #include <sys/cdefs.h>
  29 #ifndef lint
  30 __RCSID("$NetBSD: mdconfig.c,v 1.4 2005/11/01 01:42:29 chs Exp $");
  31 #endif
  32
  33 /*
  34  * This program exists for the sole purpose of providing
  35  * user-space memory for the new memory-disk driver (md).
  36  * The job done by this is similar to mount_mfs.
  37  * (But this design allows any filesystem format!)
  38  */
  39
  40 #include <sys/types.h>
  41 #include <sys/ioctl.h>
  42 #include <sys/mman.h>
  43 #include <sys/param.h>
  44
  45 #include <dev/md.h>
  46
  47 #include <fcntl.h>
  48 #include <stdio.h>
  49 #include <stdlib.h>
  50
  51 int main __P((int, char **));
  52
  53 int
  54 main(argc, argv)
  55         int argc;
  56         char **argv;
  57 {
  58         struct md_conf md;
  59         size_t nblks;
  60         int fd;
  61
  62         if (argc <= 2) {
  63                 fprintf(stderr, "usage: mdconfig <device> <%d-byte-blocks>\n",
  64                                 DEV_BSIZE);
  65                 exit(1);
  66         }
  67
  68         nblks = (size_t)strtoul(argv[2], NULL, 0);
  69         if (nblks == 0) {
  70                 fprintf(stderr, "invalid number of blocks\n");
  71                 exit(1);
  72         }
  73         md.md_size = nblks << DEV_BSHIFT;
  74
  75         fd = open(argv[1], O_RDWR, 0);
  76         if (fd < 0) {
  77                 perror(argv[1]);
  78                 exit(1);
  79         }
  80
  81         md.md_addr = mmap(NULL, md.md_size,
  82                                 PROT_READ | PROT_WRITE,
  83                                 MAP_ANON | MAP_PRIVATE,
  84                                 -1, 0);
  85         if (md.md_addr == MAP_FAILED) {
  86                 perror("mmap");
  87                 exit(1);
  88         }
  89
  90         /* Become server! */
  91         md.md_type = MD_UMEM_SERVER;
  92         if (ioctl(fd, MD_SETCONF, &md)) {
  93                 perror("ioctl");
  94                 exit(1);
  95         }
  96
  97         exit(0);
  98 }