1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 2002 Juli Mallett. All rights reserved. 5 * 6 * This software was written by Juli Mallett <jmallett@FreeBSD.org> for the 7 * FreeBSD project. Redistribution and use in source and binary forms, with 8 * or without modification, are permitted provided that the following 9 * conditions are met: 10 * 11 * 1. Redistribution of source code must retain the above copyright notice, 12 * this list of conditions and the following disclaimer. 13 * 2. Redistribution in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 19 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 20 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, 21 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 22 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 23 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 25 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING 26 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 27 * POSSIBILITY OF SUCH DAMAGE. 28 */ 29 30 #include <sys/cdefs.h> 31 __FBSDID("$FreeBSD$"); 32 33 #include <sys/param.h> 34 #include <sys/mount.h> 35 #include <sys/disklabel.h> 36 #include <sys/stat.h> 37 38 #include <ufs/ufs/ufsmount.h> 39 #include <ufs/ufs/dinode.h> 40 #include <ufs/ffs/fs.h> 41 42 #include <errno.h> 43 #include <fcntl.h> 44 #include <fstab.h> 45 #include <paths.h> 46 #include <stdio.h> 47 #include <stdlib.h> 48 #include <string.h> 49 #include <unistd.h> 50 51 #include <libufs.h> 52 53 /* Internally, track the 'name' value, it's ours. */ 54 #define MINE_NAME 0x01 55 /* Track if its fd points to a writable device. */ 56 #define MINE_WRITE 0x02 57 58 int 59 ufs_disk_close(struct uufsd *disk) 60 { 61 ERROR(disk, NULL); 62 close(disk->d_fd); 63 disk->d_fd = -1; 64 if (disk->d_inoblock != NULL) { 65 free(disk->d_inoblock); 66 disk->d_inoblock = NULL; 67 } 68 if (disk->d_mine & MINE_NAME) { 69 free((char *)(uintptr_t)disk->d_name); 70 disk->d_name = NULL; 71 } 72 if (disk->d_si != NULL) { 73 free(disk->d_si->si_csp); 74 free(disk->d_si); 75 disk->d_si = NULL; 76 } 77 return (0); 78 } 79 80 int 81 ufs_disk_fillout(struct uufsd *disk, const char *name) 82 { 83 if (ufs_disk_fillout_blank(disk, name) == -1) { 84 return (-1); 85 } 86 if (sbread(disk) == -1) { 87 ERROR(disk, "could not read superblock to fill out disk"); 88 ufs_disk_close(disk); 89 return (-1); 90 } 91 return (0); 92 } 93 94 int 95 ufs_disk_fillout_blank(struct uufsd *disk, const char *name) 96 { 97 struct stat st; 98 struct fstab *fs; 99 struct statfs sfs; 100 const char *oname; 101 char dev[MAXPATHLEN]; 102 int fd, ret; 103 104 ERROR(disk, NULL); 105 106 oname = name; 107 again: if ((ret = stat(name, &st)) < 0) { 108 if (*name != '/') { 109 snprintf(dev, sizeof(dev), "%s%s", _PATH_DEV, name); 110 name = dev; 111 goto again; 112 } 113 /* 114 * The given object doesn't exist, but don't panic just yet - 115 * it may be still mount point listed in /etc/fstab, but without 116 * existing corresponding directory. 117 */ 118 name = oname; 119 } 120 if (ret >= 0 && S_ISREG(st.st_mode)) { 121 /* Possibly a disk image, give it a try. */ 122 ; 123 } else if (ret >= 0 && S_ISCHR(st.st_mode)) { 124 /* This is what we need, do nothing. */ 125 ; 126 } else if ((fs = getfsfile(name)) != NULL) { 127 /* 128 * The given mount point is listed in /etc/fstab. 129 * It is possible that someone unmounted file system by hand 130 * and different file system is mounted on this mount point, 131 * but we still prefer /etc/fstab entry, because on the other 132 * hand, there could be /etc/fstab entry for this mount 133 * point, but file system is not mounted yet (eg. noauto) and 134 * statfs(2) will point us at different file system. 135 */ 136 name = fs->fs_spec; 137 } else if (ret >= 0 && S_ISDIR(st.st_mode)) { 138 /* 139 * The mount point is not listed in /etc/fstab, so it may be 140 * file system mounted by hand. 141 */ 142 if (statfs(name, &sfs) < 0) { 143 ERROR(disk, "could not find special device"); 144 return (-1); 145 } 146 strlcpy(dev, sfs.f_mntfromname, sizeof(dev)); 147 name = dev; 148 } else { 149 ERROR(disk, "could not find special device"); 150 return (-1); 151 } 152 fd = open(name, O_RDONLY); 153 if (fd == -1) { 154 ERROR(disk, "could not open special device"); 155 return (-1); 156 } 157 158 disk->d_bsize = 1; 159 disk->d_ccg = 0; 160 disk->d_fd = fd; 161 disk->d_inoblock = NULL; 162 disk->d_inomin = 0; 163 disk->d_inomax = 0; 164 disk->d_lcg = 0; 165 disk->d_mine = 0; 166 disk->d_ufs = 0; 167 disk->d_error = NULL; 168 disk->d_si = NULL; 169 170 if (oname != name) { 171 name = strdup(name); 172 if (name == NULL) { 173 ERROR(disk, "could not allocate memory for disk name"); 174 return (-1); 175 } 176 disk->d_mine |= MINE_NAME; 177 } 178 disk->d_name = name; 179 180 return (0); 181 } 182 183 int 184 ufs_disk_write(struct uufsd *disk) 185 { 186 int fd; 187 188 ERROR(disk, NULL); 189 190 if (disk->d_mine & MINE_WRITE) 191 return (0); 192 193 fd = open(disk->d_name, O_RDWR); 194 if (fd < 0) { 195 ERROR(disk, "failed to open disk for writing"); 196 return (-1); 197 } 198 199 close(disk->d_fd); 200 disk->d_fd = fd; 201 disk->d_mine |= MINE_WRITE; 202 203 return (0); 204 } 205