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 if (disk->d_inoblock != NULL) { 64 free(disk->d_inoblock); 65 disk->d_inoblock = NULL; 66 } 67 if (disk->d_mine & MINE_NAME) { 68 free((char *)(uintptr_t)disk->d_name); 69 disk->d_name = NULL; 70 } 71 if (disk->d_sbcsum != NULL) { 72 free(disk->d_sbcsum); 73 disk->d_sbcsum = NULL; 74 } 75 return (0); 76 } 77 78 int 79 ufs_disk_fillout(struct uufsd *disk, const char *name) 80 { 81 if (ufs_disk_fillout_blank(disk, name) == -1) { 82 return (-1); 83 } 84 if (sbread(disk) == -1) { 85 ERROR(disk, "could not read superblock to fill out disk"); 86 ufs_disk_close(disk); 87 return (-1); 88 } 89 return (0); 90 } 91 92 int 93 ufs_disk_fillout_blank(struct uufsd *disk, const char *name) 94 { 95 struct stat st; 96 struct fstab *fs; 97 struct statfs sfs; 98 const char *oname; 99 char dev[MAXPATHLEN]; 100 int fd, ret; 101 102 ERROR(disk, NULL); 103 104 oname = name; 105 again: if ((ret = stat(name, &st)) < 0) { 106 if (*name != '/') { 107 snprintf(dev, sizeof(dev), "%s%s", _PATH_DEV, name); 108 name = dev; 109 goto again; 110 } 111 /* 112 * The given object doesn't exist, but don't panic just yet - 113 * it may be still mount point listed in /etc/fstab, but without 114 * existing corresponding directory. 115 */ 116 name = oname; 117 } 118 if (ret >= 0 && S_ISREG(st.st_mode)) { 119 /* Possibly a disk image, give it a try. */ 120 ; 121 } else if (ret >= 0 && S_ISCHR(st.st_mode)) { 122 /* This is what we need, do nothing. */ 123 ; 124 } else if ((fs = getfsfile(name)) != NULL) { 125 /* 126 * The given mount point is listed in /etc/fstab. 127 * It is possible that someone unmounted file system by hand 128 * and different file system is mounted on this mount point, 129 * but we still prefer /etc/fstab entry, because on the other 130 * hand, there could be /etc/fstab entry for this mount 131 * point, but file system is not mounted yet (eg. noauto) and 132 * statfs(2) will point us at different file system. 133 */ 134 name = fs->fs_spec; 135 } else if (ret >= 0 && S_ISDIR(st.st_mode)) { 136 /* 137 * The mount point is not listed in /etc/fstab, so it may be 138 * file system mounted by hand. 139 */ 140 if (statfs(name, &sfs) < 0) { 141 ERROR(disk, "could not find special device"); 142 return (-1); 143 } 144 strlcpy(dev, sfs.f_mntfromname, sizeof(dev)); 145 name = dev; 146 } else { 147 ERROR(disk, "could not find special device"); 148 return (-1); 149 } 150 fd = open(name, O_RDONLY); 151 if (fd == -1) { 152 ERROR(disk, "could not open special device"); 153 return (-1); 154 } 155 156 disk->d_bsize = 1; 157 disk->d_ccg = 0; 158 disk->d_fd = fd; 159 disk->d_inoblock = NULL; 160 disk->d_inomin = 0; 161 disk->d_inomax = 0; 162 disk->d_lcg = 0; 163 disk->d_mine = 0; 164 disk->d_ufs = 0; 165 disk->d_error = NULL; 166 disk->d_sbcsum = NULL; 167 168 if (oname != name) { 169 name = strdup(name); 170 if (name == NULL) { 171 ERROR(disk, "could not allocate memory for disk name"); 172 return (-1); 173 } 174 disk->d_mine |= MINE_NAME; 175 } 176 disk->d_name = name; 177 178 return (0); 179 } 180 181 int 182 ufs_disk_write(struct uufsd *disk) 183 { 184 ERROR(disk, NULL); 185 186 if (disk->d_mine & MINE_WRITE) 187 return (0); 188 189 close(disk->d_fd); 190 191 disk->d_fd = open(disk->d_name, O_RDWR); 192 if (disk->d_fd < 0) { 193 ERROR(disk, "failed to open disk for writing"); 194 return (-1); 195 } 196 197 disk->d_mine |= MINE_WRITE; 198 199 return (0); 200 } 201