Home | History | Annotate | Line # | Download | only in mdconfig
mdconfig.c revision 1.6 
      1 /*	$NetBSD: mdconfig.c,v 1.6 2018/01/23 21:06:25 sevan 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 1.6 2018/01/23 21:06:25 sevan 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
     52 main(int argc, char *argv[])
     53 {
     54 	struct md_conf md;
     55 	size_t nblks;
     56 	int fd;
     57 
     58 	if (argc <= 2) {
     59 		fprintf(stderr, "usage: mdconfig <device> <%d-byte-blocks>\n",
     60 				DEV_BSIZE);
     61 		exit(1);
     62 	}
     63 
     64 	nblks = (size_t)strtoul(argv[2], NULL, 0);
     65 	if (nblks == 0) {
     66 		fprintf(stderr, "invalid number of blocks\n");
     67 		exit(1);
     68 	}
     69 	md.md_size = nblks << DEV_BSHIFT;
     70 
     71 	fd = open(argv[1], O_RDWR, 0);
     72 	if (fd < 0) {
     73 		perror(argv[1]);
     74 		exit(1);
     75 	}
     76 
     77 	md.md_addr = mmap(NULL, md.md_size,
     78 				PROT_READ | PROT_WRITE,
     79 				MAP_ANON | MAP_PRIVATE,
     80 				-1, 0);
     81 	if (md.md_addr == MAP_FAILED) {
     82 		perror("mmap");
     83 		exit(1);
     84 	}
     85 
     86 	/* Become server! */
     87 	md.md_type = MD_UMEM_SERVER;
     88 	if (ioctl(fd, MD_SETCONF, &md)) {
     89 		perror("ioctl");
     90 		exit(1);
     91 	}
     92 
     93 	exit(0);
     94 }
     95