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
42off_t
43mkuz_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			return (-1);
63		}
64		if (ioctl(ffd, DIOCGMEDIASIZE, &ms) < 0) {
65			warn("ioctl(DIOCGMEDIASIZE)");
66			close(ffd);
67			return (-1);
68		}
69		close(ffd);
70		sb.st_size = ms;
71	} else if (S_ISCHR(sb.st_mode)) {
72		if (ioctl(cfp->fdr, DIOCGMEDIASIZE, &ms) < 0) {
73			warn("ioctl(DIOCGMEDIASIZE)");
74			return (-1);
75		}
76		sb.st_size = ms;
77	} else if (!S_ISREG(sb.st_mode)) {
78		warnx("%s: not a character device or regular file\n",
79			cfp->iname);
80		return (-1);
81	}
82	return (sb.st_size);
83}
84