1 /*
2 * Copyright (c) 2004-2016 Maxim Sobolev <sobomax@FreeBSD.org>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 */
26
27 #include <sys/cdefs.h>
28 #include <sys/disk.h>
29 #include <sys/ioctl.h>
30 #include <sys/param.h>
31 #include <sys/mount.h>
32 #include <sys/stat.h>
33 #include <err.h>
34 #include <fcntl.h>
35 #include <unistd.h>
36
37 #include "mkuz_cfg.h"
38 #include "mkuz_insize.h"
39
40 off_t
mkuz_get_insize(struct mkuz_cfg * cfp)41 mkuz_get_insize(struct mkuz_cfg *cfp)
42 {
43 int ffd;
44 off_t ms;
45 struct stat sb;
46 struct statfs statfsbuf;
47
48 if (fstat(cfp->fdr, &sb) != 0) {
49 warn("fstat(%s)", cfp->iname);
50 return (-1);
51 }
52 if ((sb.st_flags & SF_SNAPSHOT) != 0) {
53 if (fstatfs(cfp->fdr, &statfsbuf) != 0) {
54 warn("fstatfs(%s)", cfp->iname);
55 return (-1);
56 }
57 ffd = open(statfsbuf.f_mntfromname, O_RDONLY);
58 if (ffd < 0) {
59 warn("open(%s, O_RDONLY)", statfsbuf.f_mntfromname);
60 return (-1);
61 }
62 if (ioctl(ffd, DIOCGMEDIASIZE, &ms) < 0) {
63 warn("ioctl(DIOCGMEDIASIZE)");
64 close(ffd);
65 return (-1);
66 }
67 close(ffd);
68 sb.st_size = ms;
69 } else if (S_ISCHR(sb.st_mode)) {
70 if (ioctl(cfp->fdr, DIOCGMEDIASIZE, &ms) < 0) {
71 warn("ioctl(DIOCGMEDIASIZE)");
72 return (-1);
73 }
74 sb.st_size = ms;
75 } else if (!S_ISREG(sb.st_mode)) {
76 warnx("%s: not a character device or regular file\n",
77 cfp->iname);
78 return (-1);
79 }
80 return (sb.st_size);
81 }
82