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      1 /*	$NetBSD: rump_nqmfs.c,v 1.3 2010/03/31 14:54:07 pooka Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 2010 Antti Kantee.  All Rights Reserved.
      5  *
      6  * Redistribution and use in source and binary forms, with or without
      7  * modification, are permitted provided that the following conditions
      8  * are met:
      9  * 1. Redistributions of source code must retain the above copyright
     10  *    notice, this list of conditions and the following disclaimer.
     11  * 2. Redistributions in binary form must reproduce the above copyright
     12  *    notice, this list of conditions and the following disclaimer in the
     13  *    documentation and/or other materials provided with the distribution.
     14  *
     15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
     16  * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
     17  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
     18  * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
     19  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     20  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
     21  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     22  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     23  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     24  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     25  * SUCH DAMAGE.
     26  */
     27 
     28 /*
     29  * Not Quite MFS.  Instead of allocating memory and creating a FFS file system
     30  * there, mmap a file (which should contain ffs) and use that as the backend.
     31  * You can also give a newly created image as the file ...
     32  */
     33 
     34 #include <sys/types.h>
     35 #include <sys/mman.h>
     36 #include <sys/mount.h>
     37 #include <sys/stat.h>
     38 
     39 #include <ufs/ufs/ufsmount.h>
     40 
     41 #include <err.h>
     42 #include <mntopts.h>
     43 #include <puffs.h>
     44 #include <stdio.h>
     45 #include <stdlib.h>
     46 #include <unistd.h>
     47 
     48 #include <rump/p2k.h>
     49 #include <rump/ukfs.h>
     50 
     51 const struct mntopt mopts[] = {
     52 	MOPT_STDOPTS,
     53 	MOPT_NULL,
     54 };
     55 
     56 static void
     57 usage(void)
     58 {
     59 
     60 	fprintf(stderr, "%s: [-o args] fspec mountpoint\n", getprogname());
     61 	exit(1);
     62 }
     63 
     64 static struct mfs_args args;
     65 static char *mntpath, *mntfile;
     66 static int mntflags, altflags;
     67 
     68 int
     69 main(int argc, char *argv[])
     70 {
     71 	struct stat sb;
     72 	mntoptparse_t mp;
     73 	void *membase;
     74 	int ch, fd, rdonly, shared;
     75 
     76 	setprogname(argv[0]);
     77 	puffs_unmountonsignal(SIGINT, true);
     78 	puffs_unmountonsignal(SIGTERM, true);
     79 
     80 	shared = mntflags = altflags = 0;
     81 
     82 	memset(&args, 0, sizeof(args));
     83 	while ((ch = getopt(argc, argv, "o:s")) != -1) {
     84 		switch (ch) {
     85 		case 'o':
     86 			mp = getmntopts(optarg, mopts, &mntflags, &altflags);
     87 			if (mp == NULL)
     88 				err(1, "getmntopts");
     89 			freemntopts(mp);
     90 			break;
     91 		case 's':
     92 			shared = 1;
     93 			break;
     94 		default:
     95 			usage();
     96 			break;
     97 		}
     98 	}
     99 	argc -= optind;
    100 	argv += optind;
    101 
    102 	if (argc != 2)
    103 		usage();
    104 	mntfile = argv[0];
    105 	mntpath = argv[1];
    106 	rdonly = mntflags & MNT_RDONLY;
    107 
    108 	if (stat(mntfile, &sb) == -1)
    109 		err(1, "stat fspec");
    110 	if (!S_ISREG(sb.st_mode))
    111 		errx(1, "fspec must be a regular file");
    112 
    113 	fd = open(mntfile, rdonly ? O_RDONLY: O_RDWR);
    114 	if (fd == -1)
    115 		err(1, "open fspec");
    116 
    117 	membase = mmap(NULL, sb.st_size, PROT_READ | (rdonly ? 0 : PROT_WRITE),
    118 	    MAP_FILE | (shared ? MAP_SHARED : MAP_PRIVATE), fd, 0);
    119 	if (membase == MAP_FAILED)
    120 		err(1, "cannot mmap fspec");
    121 
    122 	args.fspec = mntfile;
    123 	args.base = membase;
    124 	args.size = sb.st_size;
    125 
    126 	if (p2k_run_fs(MOUNT_MFS, "/swabbie", mntpath,
    127 	    0, &args, sizeof(args), 0) == -1)
    128 		err(1, "p2k");
    129 
    130 	return 0;
    131 }
    132