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
40off_t
41mkuz_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