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 __FBSDID("$FreeBSD$");
29
30 #include <sys/disk.h>
31 #include <sys/ioctl.h>
32 #include <sys/param.h>
33 #include <sys/mount.h>
34 #include <sys/stat.h>
35 #include <err.h>
36 #include <fcntl.h>
37 #include <unistd.h>
38
39 #include "mkuz_cfg.h"
40 #include "mkuz_insize.h"
41
42 off_t
mkuz_get_insize(struct mkuz_cfg * cfp)43 mkuz_get_insize(struct mkuz_cfg *cfp)
44 {
45 int ffd;
46 off_t ms;
47 struct stat sb;
48 struct statfs statfsbuf;
49
50 if (fstat(cfp->fdr, &sb) != 0) {
51 warn("fstat(%s)", cfp->iname);
52 return (-1);
53 }
54 if ((sb.st_flags & SF_SNAPSHOT) != 0) {
55 if (fstatfs(cfp->fdr, &statfsbuf) != 0) {
56 warn("fstatfs(%s)", cfp->iname);
57 return (-1);
58 }
59 ffd = open(statfsbuf.f_mntfromname, O_RDONLY);
60 if (ffd < 0) {
61 warn("open(%s, O_RDONLY)", statfsbuf.f_mntfromname);
62 close(ffd);
63 return (-1);
64 }
65 if (ioctl(ffd, DIOCGMEDIASIZE, &ms) < 0) {
66 warn("ioctl(DIOCGMEDIASIZE)");
67 close(ffd);
68 return (-1);
69 }
70 close(ffd);
71 sb.st_size = ms;
72 } else if (S_ISCHR(sb.st_mode)) {
73 if (ioctl(cfp->fdr, DIOCGMEDIASIZE, &ms) < 0) {
74 warn("ioctl(DIOCGMEDIASIZE)");
75 return (-1);
76 }
77 sb.st_size = ms;
78 } else if (!S_ISREG(sb.st_mode)) {
79 warnx("%s: not a character device or regular file\n",
80 cfp->iname);
81 return (-1);
82 }
83 return (sb.st_size);
84 }
85