/*
* Copyright (c) 2004-2016 Maxim Sobolev <sobomax@FreeBSD.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
#include <sys/disk.h>
#include <sys/ioctl.h>
#include <sys/param.h>
#include <sys/mount.h>
#include <sys/stat.h>
#include <err.h>
#include <fcntl.h>
#include <unistd.h>
#include "mkuz_cfg.h"
#include "mkuz_insize.h"
off_t
mkuz_get_insize(struct mkuz_cfg *cfp)
{
int ffd;
off_t ms;
struct stat sb;
struct statfs statfsbuf;
if (fstat(cfp->fdr, &sb) != 0) {
warn("fstat(%s)", cfp->iname);
return (-1);
}
if ((sb.st_flags & SF_SNAPSHOT) != 0) {
if (fstatfs(cfp->fdr, &statfsbuf) != 0) {
warn("fstatfs(%s)", cfp->iname);
return (-1);
}
ffd = open(statfsbuf.f_mntfromname, O_RDONLY);
if (ffd < 0) {
warn("open(%s, O_RDONLY)", statfsbuf.f_mntfromname);
return (-1);
}
if (ioctl(ffd, DIOCGMEDIASIZE, &ms) < 0) {
warn("ioctl(DIOCGMEDIASIZE)");
close(ffd);
return (-1);
}
close(ffd);
sb.st_size = ms;
} else if (S_ISCHR(sb.st_mode)) {
if (ioctl(cfp->fdr, DIOCGMEDIASIZE, &ms) < 0) {
warn("ioctl(DIOCGMEDIASIZE)");
return (-1);
}
sb.st_size = ms;
} else if (!S_ISREG(sb.st_mode)) {
warnx("%s: not a character device or regular file\n",
cfp->iname);
return (-1);
}
return (sb.st_size);
}
plain