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_sbcsum != NULL) { 73 free(disk->d_sbcsum); 74 disk->d_sbcsum = NULL; 75 } 76 return (0); 77 } 78 79 int 80 ufs_disk_fillout(struct uufsd *disk, const char *name) 81 { 82 if (ufs_disk_fillout_blank(disk, name) == -1) { 83 return (-1); 84 } 85 if (sbread(disk) == -1) { 86 ERROR(disk, "could not read superblock to fill out disk"); 87 ufs_disk_close(disk); 88 return (-1); 89 } 90 return (0); 91 } 92 93 int 94 ufs_disk_fillout_blank(struct uufsd *disk, const char *name) 95 { 96 struct stat st; 97 struct fstab *fs; 98 struct statfs sfs; 99 const char *oname; 100 char dev[MAXPATHLEN]; 101 int fd, ret; 102 103 ERROR(disk, NULL); 104 105 oname = name; 106 again: if ((ret = stat(name, &st)) < 0) { 107 if (*name != '/') { 108 snprintf(dev, sizeof(dev), "%s%s", _PATH_DEV, name); 109 name = dev; 110 goto again; 111 } 112 /* 113 * The given object doesn't exist, but don't panic just yet - 114 * it may be still mount point listed in /etc/fstab, but without 115 * existing corresponding directory. 116 */ 117 name = oname; 118 } 119 if (ret >= 0 && S_ISREG(st.st_mode)) { 120 /* Possibly a disk image, give it a try. */ 121 ; 122 } else if (ret >= 0 && S_ISCHR(st.st_mode)) { 123 /* This is what we need, do nothing. */ 124 ; 125 } else if ((fs = getfsfile(name)) != NULL) { 126 /* 127 * The given mount point is listed in /etc/fstab. 128 * It is possible that someone unmounted file system by hand 129 * and different file system is mounted on this mount point, 130 * but we still prefer /etc/fstab entry, because on the other 131 * hand, there could be /etc/fstab entry for this mount 132 * point, but file system is not mounted yet (eg. noauto) and 133 * statfs(2) will point us at different file system. 134 */ 135 name = fs->fs_spec; 136 } else if (ret >= 0 && S_ISDIR(st.st_mode)) { 137 /* 138 * The mount point is not listed in /etc/fstab, so it may be 139 * file system mounted by hand. 140 */ 141 if (statfs(name, &sfs) < 0) { 142 ERROR(disk, "could not find special device"); 143 return (-1); 144 } 145 strlcpy(dev, sfs.f_mntfromname, sizeof(dev)); 146 name = dev; 147 } else { 148 ERROR(disk, "could not find special device"); 149 return (-1); 150 } 151 fd = open(name, O_RDONLY); 152 if (fd == -1) { 153 ERROR(disk, "could not open special device"); 154 return (-1); 155 } 156 157 disk->d_bsize = 1; 158 disk->d_ccg = 0; 159 disk->d_fd = fd; 160 disk->d_inoblock = NULL; 161 disk->d_inomin = 0; 162 disk->d_inomax = 0; 163 disk->d_lcg = 0; 164 disk->d_mine = 0; 165 disk->d_ufs = 0; 166 disk->d_error = NULL; 167 disk->d_sbcsum = NULL; 168 169 if (oname != name) { 170 name = strdup(name); 171 if (name == NULL) { 172 ERROR(disk, "could not allocate memory for disk name"); 173 return (-1); 174 } 175 disk->d_mine |= MINE_NAME; 176 } 177 disk->d_name = name; 178 179 return (0); 180 } 181 182 int 183 ufs_disk_write(struct uufsd *disk) 184 { 185 int fd; 186 187 ERROR(disk, NULL); 188 189 if (disk->d_mine & MINE_WRITE) 190 return (0); 191 192 fd = open(disk->d_name, O_RDWR); 193 if (fd < 0) { 194 ERROR(disk, "failed to open disk for writing"); 195 return (-1); 196 } 197 198 close(disk->d_fd); 199 disk->d_fd = fd; 200 disk->d_mine |= MINE_WRITE; 201 202 return (0); 203 } 204