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mdconfig.c revision 1.7 
      1 /*	$NetBSD: mdconfig.c,v 1.7 2020/08/18 19:26:29 christos 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 1.7 2020/08/18 19:26:29 christos 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/errno.h>
     41 #include <sys/ioctl.h>
     42 #include <sys/mman.h>
     43 #include <sys/param.h>
     44 #include <sys/types.h>
     45 
     46 #include <dev/md.h>
     47 
     48 #include <assert.h>
     49 #include <err.h>
     50 #include <errno.h>
     51 #include <fcntl.h>
     52 #include <stdio.h>
     53 #include <stdlib.h>
     54 #include <util.h>
     55 
     56 int
     57 main(int argc, char *argv[])
     58 {
     59 	struct md_conf md;
     60 	char fname[MAXPATHLEN];
     61 	int64_t num;
     62 	size_t blks, bytes;
     63 	int fd;
     64 
     65 	setprogname(argv[0]);
     66 
     67 	if (argc != 3) {
     68 		(void)fprintf(stderr, "Usage: %s <device> <%d-byte-blocks>\n",
     69 		    getprogname(), DEV_BSIZE);
     70 		return EXIT_FAILURE;
     71 	}
     72 
     73 	if (dehumanize_number(argv[2], &num) == -1)
     74 		goto bad_num;
     75 
     76 	blks = (size_t)num;
     77 	bytes = blks << DEV_BSHIFT;
     78 	if (num <= 0 || bytes >> DEV_BSHIFT != blks) {
     79 bad_num:	err(EXIT_FAILURE, "blocks: `%s'", argv[2]);
     80 	}
     81 	md.md_size = bytes;
     82 
     83 	fd = opendisk(argv[1], O_RDWR, fname, sizeof(fname), 0);
     84 	if (fd == -1)
     85 		err(EXIT_FAILURE, "Can't open `%s'", argv[1]);
     86 
     87 	md.md_addr = mmap(NULL, md.md_size, PROT_READ | PROT_WRITE,
     88 	    MAP_ANON | MAP_PRIVATE, -1, 0);
     89 	if (md.md_addr == MAP_FAILED)
     90 		err(EXIT_FAILURE, "mmap");
     91 
     92 	/* Become server! */
     93 	md.md_type = MD_UMEM_SERVER;
     94 	if (ioctl(fd, MD_SETCONF, &md) == -1)
     95 		err(EXIT_FAILURE, "ioctl");
     96 
     97 	return EXIT_SUCCESS;
     98 }
     99