1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 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 #include <sys/param.h> 32 #include <sys/mount.h> 33 #include <sys/disklabel.h> 34 #include <sys/stat.h> 35 36 #include <ufs/ufs/extattr.h> 37 #include <ufs/ufs/quota.h> 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_mine & MINE_NAME) { 65 free((char *)(uintptr_t)disk->d_name); 66 disk->d_name = NULL; 67 } 68 if (disk->d_si != NULL) { 69 free(disk->d_si->si_csp); 70 free(disk->d_si); 71 disk->d_si = NULL; 72 } 73 return (0); 74 } 75 76 int 77 ufs_disk_fillout(struct uufsd *disk, const char *name) 78 { 79 if (ufs_disk_fillout_blank(disk, name) == -1) { 80 return (-1); 81 } 82 if (sbread(disk) == -1) { 83 ERROR(disk, "could not read superblock to fill out disk"); 84 ufs_disk_close(disk); 85 return (-1); 86 } 87 return (0); 88 } 89 90 int 91 ufs_disk_fillout_blank(struct uufsd *disk, const char *name) 92 { 93 struct stat st; 94 struct fstab *fs; 95 struct statfs sfs; 96 const char *oname; 97 char dev[MAXPATHLEN]; 98 int fd, ret; 99 100 ERROR(disk, NULL); 101 102 oname = name; 103 again: if ((ret = stat(name, &st)) < 0) { 104 if (*name != '/') { 105 snprintf(dev, sizeof(dev), "%s%s", _PATH_DEV, name); 106 name = dev; 107 goto again; 108 } 109 /* 110 * The given object doesn't exist, but don't panic just yet - 111 * it may be still mount point listed in /etc/fstab, but without 112 * existing corresponding directory. 113 */ 114 name = oname; 115 } 116 if (ret >= 0 && S_ISREG(st.st_mode)) { 117 /* Possibly a disk image, give it a try. */ 118 ; 119 } else if (ret >= 0 && S_ISCHR(st.st_mode)) { 120 /* This is what we need, do nothing. */ 121 ; 122 } else if ((fs = getfsfile(name)) != NULL) { 123 /* 124 * The given mount point is listed in /etc/fstab. 125 * It is possible that someone unmounted file system by hand 126 * and different file system is mounted on this mount point, 127 * but we still prefer /etc/fstab entry, because on the other 128 * hand, there could be /etc/fstab entry for this mount 129 * point, but file system is not mounted yet (eg. noauto) and 130 * statfs(2) will point us at different file system. 131 */ 132 name = fs->fs_spec; 133 } else if (ret >= 0 && S_ISDIR(st.st_mode)) { 134 /* 135 * The mount point is not listed in /etc/fstab, so it may be 136 * file system mounted by hand. 137 */ 138 if (statfs(name, &sfs) < 0) { 139 ERROR(disk, "could not find special device"); 140 return (-1); 141 } 142 strlcpy(dev, sfs.f_mntfromname, sizeof(dev)); 143 name = dev; 144 } else { 145 ERROR(disk, "could not find special device"); 146 return (-1); 147 } 148 fd = open(name, O_RDONLY); 149 if (fd == -1) { 150 ERROR(disk, "could not open special device"); 151 return (-1); 152 } 153 154 if (((uintptr_t)disk & ~(LIBUFS_BUFALIGN - 1)) != (uintptr_t)disk) { 155 ERROR(disk, "uufsd structure must be aligned to " 156 "LIBUFS_BUFALIGN byte boundry, see ufs_disk_fillout(3)"); 157 close(fd); 158 return (-1); 159 } 160 161 disk->d_bsize = 1; 162 disk->d_ccg = 0; 163 disk->d_fd = fd; 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 disk->d_sblockloc = UFS_STDSB; 172 disk->d_lookupflags = 0; 173 174 if (oname != name) { 175 name = strdup(name); 176 if (name == NULL) { 177 ERROR(disk, "could not allocate memory for disk name"); 178 return (-1); 179 } 180 disk->d_mine |= MINE_NAME; 181 } 182 disk->d_name = name; 183 184 return (0); 185 } 186 187 int 188 ufs_disk_write(struct uufsd *disk) 189 { 190 int fd; 191 192 ERROR(disk, NULL); 193 194 if (disk->d_mine & MINE_WRITE) 195 return (0); 196 197 fd = open(disk->d_name, O_RDWR); 198 if (fd < 0) { 199 ERROR(disk, "failed to open disk for writing"); 200 return (-1); 201 } 202 203 close(disk->d_fd); 204 disk->d_fd = fd; 205 disk->d_mine |= MINE_WRITE; 206 207 return (0); 208 } 209