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 40 off_t 41 mkuz_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