/*      $NetBSD: rump_nqmfs.c,v 1.3 2010/03/31 14:54:07 pooka Exp $     */

/*
* Copyright (c) 2010 Antti Kantee.  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 OR CONTRIBUTORS 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.
*/

/*
* Not Quite MFS.  Instead of allocating memory and creating a FFS file system
* there, mmap a file (which should contain ffs) and use that as the backend.
* You can also give a newly created image as the file ...
*/

#include <sys/types.h>
#include <sys/mman.h>
#include <sys/mount.h>
#include <sys/stat.h>

#include <ufs/ufs/ufsmount.h>

#include <err.h>
#include <mntopts.h>
#include <puffs.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>

#include <rump/p2k.h>
#include <rump/ukfs.h>

const struct mntopt mopts[] = {
       MOPT_STDOPTS,
       MOPT_NULL,
};

static void
usage(void)
{

       fprintf(stderr, "%s: [-o args] fspec mountpoint\n", getprogname());
       exit(1);
}

static struct mfs_args args;
static char *mntpath, *mntfile;
static int mntflags, altflags;

int
main(int argc, char *argv[])
{
       struct stat sb;
       mntoptparse_t mp;
       void *membase;
       int ch, fd, rdonly, shared;

       setprogname(argv[0]);
       puffs_unmountonsignal(SIGINT, true);
       puffs_unmountonsignal(SIGTERM, true);

       shared = mntflags = altflags = 0;

       memset(&args, 0, sizeof(args));
       while ((ch = getopt(argc, argv, "o:s")) != -1) {
               switch (ch) {
               case 'o':
                       mp = getmntopts(optarg, mopts, &mntflags, &altflags);
                       if (mp == NULL)
                               err(1, "getmntopts");
                       freemntopts(mp);
                       break;
               case 's':
                       shared = 1;
                       break;
               default:
                       usage();
                       break;
               }
       }
       argc -= optind;
       argv += optind;

       if (argc != 2)
               usage();
       mntfile = argv[0];
       mntpath = argv[1];
       rdonly = mntflags & MNT_RDONLY;

       if (stat(mntfile, &sb) == -1)
               err(1, "stat fspec");
       if (!S_ISREG(sb.st_mode))
               errx(1, "fspec must be a regular file");

       fd = open(mntfile, rdonly ? O_RDONLY: O_RDWR);
       if (fd == -1)
               err(1, "open fspec");

       membase = mmap(NULL, sb.st_size, PROT_READ | (rdonly ? 0 : PROT_WRITE),
           MAP_FILE | (shared ? MAP_SHARED : MAP_PRIVATE), fd, 0);
       if (membase == MAP_FAILED)
               err(1, "cannot mmap fspec");

       args.fspec = mntfile;
       args.base = membase;
       args.size = sb.st_size;

       if (p2k_run_fs(MOUNT_MFS, "/swabbie", mntpath,
           0, &args, sizeof(args), 0) == -1)
               err(1, "p2k");

       return 0;
}