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
usage(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
main(int argc,char * argv[])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