/*      $NetBSD: mdconfig.c,v 1.7 2020/08/18 19:26:29 christos Exp $    */

/*
* Copyright (c) 1995 Gordon W. Ross
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
*    notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
*    notice, this list of conditions and the following disclaimer in the
*    documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/

#include <sys/cdefs.h>
#ifndef lint
__RCSID("$NetBSD: mdconfig.c,v 1.7 2020/08/18 19:26:29 christos Exp $");
#endif

/*
* This program exists for the sole purpose of providing
* user-space memory for the new memory-disk driver (md).
* The job done by this is similar to mount_mfs.
* (But this design allows any filesystem format!)
*/

#include <sys/errno.h>
#include <sys/ioctl.h>
#include <sys/mman.h>
#include <sys/param.h>
#include <sys/types.h>

#include <dev/md.h>

#include <assert.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <util.h>

int
main(int argc, char *argv[])
{
       struct md_conf md;
       char fname[MAXPATHLEN];
       int64_t num;
       size_t blks, bytes;
       int fd;

       setprogname(argv[0]);

       if (argc != 3) {
               (void)fprintf(stderr, "Usage: %s <device> <%d-byte-blocks>\n",
                   getprogname(), DEV_BSIZE);
               return EXIT_FAILURE;
       }

       if (dehumanize_number(argv[2], &num) == -1)
               goto bad_num;

       blks = (size_t)num;
       bytes = blks << DEV_BSHIFT;
       if (num <= 0 || bytes >> DEV_BSHIFT != blks) {
bad_num:        err(EXIT_FAILURE, "blocks: `%s'", argv[2]);
       }
       md.md_size = bytes;

       fd = opendisk(argv[1], O_RDWR, fname, sizeof(fname), 0);
       if (fd == -1)
               err(EXIT_FAILURE, "Can't open `%s'", argv[1]);

       md.md_addr = mmap(NULL, md.md_size, PROT_READ | PROT_WRITE,
           MAP_ANON | MAP_PRIVATE, -1, 0);
       if (md.md_addr == MAP_FAILED)
               err(EXIT_FAILURE, "mmap");

       /* Become server! */
       md.md_type = MD_UMEM_SERVER;
       if (ioctl(fd, MD_SETCONF, &md) == -1)
               err(EXIT_FAILURE, "ioctl");

       return EXIT_SUCCESS;
}