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/extattr.h> 39 #include <ufs/ufs/quota.h> 40 #include <ufs/ufs/ufsmount.h> 41 #include <ufs/ufs/dinode.h> 42 #include <ufs/ffs/fs.h> 43 44 #include <errno.h> 45 #include <fcntl.h> 46 #include <fstab.h> 47 #include <paths.h> 48 #include <stdio.h> 49 #include <stdlib.h> 50 #include <string.h> 51 #include <unistd.h> 52 53 #include <libufs.h> 54 55 /* Internally, track the 'name' value, it's ours. */ 56 #define MINE_NAME 0x01 57 /* Track if its fd points to a writable device. */ 58 #define MINE_WRITE 0x02 59 60 int 61 ufs_disk_close(struct uufsd *disk) 62 { 63 ERROR(disk, NULL); 64 close(disk->d_fd); 65 disk->d_fd = -1; 66 if (disk->d_inoblock != NULL) { 67 free(disk->d_inoblock); 68 disk->d_inoblock = NULL; 69 } 70 if (disk->d_mine & MINE_NAME) { 71 free((char *)(uintptr_t)disk->d_name); 72 disk->d_name = NULL; 73 } 74 if (disk->d_si != NULL) { 75 free(disk->d_si->si_csp); 76 free(disk->d_si); 77 disk->d_si = NULL; 78 } 79 return (0); 80 } 81 82 int 83 ufs_disk_fillout(struct uufsd *disk, const char *name) 84 { 85 if (ufs_disk_fillout_blank(disk, name) == -1) { 86 return (-1); 87 } 88 if (sbread(disk) == -1) { 89 ERROR(disk, "could not read superblock to fill out disk"); 90 ufs_disk_close(disk); 91 return (-1); 92 } 93 return (0); 94 } 95 96 int 97 ufs_disk_fillout_blank(struct uufsd *disk, const char *name) 98 { 99 struct stat st; 100 struct fstab *fs; 101 struct statfs sfs; 102 const char *oname; 103 char dev[MAXPATHLEN]; 104 int fd, ret; 105 106 ERROR(disk, NULL); 107 108 oname = name; 109 again: if ((ret = stat(name, &st)) < 0) { 110 if (*name != '/') { 111 snprintf(dev, sizeof(dev), "%s%s", _PATH_DEV, name); 112 name = dev; 113 goto again; 114 } 115 /* 116 * The given object doesn't exist, but don't panic just yet - 117 * it may be still mount point listed in /etc/fstab, but without 118 * existing corresponding directory. 119 */ 120 name = oname; 121 } 122 if (ret >= 0 && S_ISREG(st.st_mode)) { 123 /* Possibly a disk image, give it a try. */ 124 ; 125 } else if (ret >= 0 && S_ISCHR(st.st_mode)) { 126 /* This is what we need, do nothing. */ 127 ; 128 } else if ((fs = getfsfile(name)) != NULL) { 129 /* 130 * The given mount point is listed in /etc/fstab. 131 * It is possible that someone unmounted file system by hand 132 * and different file system is mounted on this mount point, 133 * but we still prefer /etc/fstab entry, because on the other 134 * hand, there could be /etc/fstab entry for this mount 135 * point, but file system is not mounted yet (eg. noauto) and 136 * statfs(2) will point us at different file system. 137 */ 138 name = fs->fs_spec; 139 } else if (ret >= 0 && S_ISDIR(st.st_mode)) { 140 /* 141 * The mount point is not listed in /etc/fstab, so it may be 142 * file system mounted by hand. 143 */ 144 if (statfs(name, &sfs) < 0) { 145 ERROR(disk, "could not find special device"); 146 return (-1); 147 } 148 strlcpy(dev, sfs.f_mntfromname, sizeof(dev)); 149 name = dev; 150 } else { 151 ERROR(disk, "could not find special device"); 152 return (-1); 153 } 154 fd = open(name, O_RDONLY); 155 if (fd == -1) { 156 ERROR(disk, "could not open special device"); 157 return (-1); 158 } 159 160 disk->d_bsize = 1; 161 disk->d_ccg = 0; 162 disk->d_fd = fd; 163 disk->d_inoblock = NULL; 164 disk->d_inomin = 0; 165 disk->d_inomax = 0; 166 disk->d_lcg = 0; 167 disk->d_mine = 0; 168 disk->d_ufs = 0; 169 disk->d_error = NULL; 170 disk->d_si = NULL; 171 172 if (oname != name) { 173 name = strdup(name); 174 if (name == NULL) { 175 ERROR(disk, "could not allocate memory for disk name"); 176 return (-1); 177 } 178 disk->d_mine |= MINE_NAME; 179 } 180 disk->d_name = name; 181 182 return (0); 183 } 184 185 int 186 ufs_disk_write(struct uufsd *disk) 187 { 188 int fd; 189 190 ERROR(disk, NULL); 191 192 if (disk->d_mine & MINE_WRITE) 193 return (0); 194 195 fd = open(disk->d_name, O_RDWR); 196 if (fd < 0) { 197 ERROR(disk, "failed to open disk for writing"); 198 return (-1); 199 } 200 201 close(disk->d_fd); 202 disk->d_fd = fd; 203 disk->d_mine |= MINE_WRITE; 204 205 return (0); 206 } 207