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