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/param.h> 31 #include <sys/mount.h> 32 #include <sys/disklabel.h> 33 #include <sys/stat.h> 34 35 #include <ufs/ufs/extattr.h> 36 #include <ufs/ufs/quota.h> 37 #include <ufs/ufs/ufsmount.h> 38 #include <ufs/ufs/dinode.h> 39 #include <ufs/ffs/fs.h> 40 41 #include <errno.h> 42 #include <fcntl.h> 43 #include <fstab.h> 44 #include <paths.h> 45 #include <stdio.h> 46 #include <stdlib.h> 47 #include <string.h> 48 #include <unistd.h> 49 50 #include <libufs.h> 51 52 /* Internally, track the 'name' value, it's ours. */ 53 #define MINE_NAME 0x01 54 /* Track if its fd points to a writable device. */ 55 #define MINE_WRITE 0x02 56 57 int 58 ufs_disk_close(struct uufsd *disk) 59 { 60 ERROR(disk, NULL); 61 close(disk->d_fd); 62 disk->d_fd = -1; 63 if (disk->d_mine & MINE_NAME) { 64 free((char *)(uintptr_t)disk->d_name); 65 disk->d_name = NULL; 66 } 67 if (disk->d_si != NULL) { 68 free(disk->d_si->si_csp); 69 free(disk->d_si); 70 disk->d_si = NULL; 71 } 72 return (0); 73 } 74 75 int 76 ufs_disk_fillout(struct uufsd *disk, const char *name) 77 { 78 if (ufs_disk_fillout_blank(disk, name) == -1) { 79 return (-1); 80 } 81 if (sbread(disk) == -1) { 82 ERROR(disk, "could not read superblock to fill out disk"); 83 ufs_disk_close(disk); 84 return (-1); 85 } 86 return (0); 87 } 88 89 int 90 ufs_disk_fillout_blank(struct uufsd *disk, const char *name) 91 { 92 struct stat st; 93 struct fstab *fs; 94 struct statfs sfs; 95 const char *oname; 96 char dev[MAXPATHLEN]; 97 int fd, ret; 98 99 ERROR(disk, NULL); 100 101 oname = name; 102 again: if ((ret = stat(name, &st)) < 0) { 103 if (*name != '/') { 104 snprintf(dev, sizeof(dev), "%s%s", _PATH_DEV, name); 105 name = dev; 106 goto again; 107 } 108 /* 109 * The given object doesn't exist, but don't panic just yet - 110 * it may be still mount point listed in /etc/fstab, but without 111 * existing corresponding directory. 112 */ 113 name = oname; 114 } 115 if (ret >= 0 && S_ISREG(st.st_mode)) { 116 /* Possibly a disk image, give it a try. */ 117 ; 118 } else if (ret >= 0 && S_ISCHR(st.st_mode)) { 119 /* This is what we need, do nothing. */ 120 ; 121 } else if ((fs = getfsfile(name)) != NULL) { 122 /* 123 * The given mount point is listed in /etc/fstab. 124 * It is possible that someone unmounted file system by hand 125 * and different file system is mounted on this mount point, 126 * but we still prefer /etc/fstab entry, because on the other 127 * hand, there could be /etc/fstab entry for this mount 128 * point, but file system is not mounted yet (eg. noauto) and 129 * statfs(2) will point us at different file system. 130 */ 131 name = fs->fs_spec; 132 } else if (ret >= 0 && S_ISDIR(st.st_mode)) { 133 /* 134 * The mount point is not listed in /etc/fstab, so it may be 135 * file system mounted by hand. 136 */ 137 if (statfs(name, &sfs) < 0) { 138 ERROR(disk, "could not find special device"); 139 return (-1); 140 } 141 strlcpy(dev, sfs.f_mntfromname, sizeof(dev)); 142 name = dev; 143 } else { 144 ERROR(disk, "could not find special device"); 145 return (-1); 146 } 147 fd = open(name, O_RDONLY); 148 if (fd == -1) { 149 ERROR(disk, "could not open special device"); 150 return (-1); 151 } 152 153 if (((uintptr_t)disk & ~(LIBUFS_BUFALIGN - 1)) != (uintptr_t)disk) { 154 ERROR(disk, "uufsd structure must be aligned to " 155 "LIBUFS_BUFALIGN byte boundry, see ufs_disk_fillout(3)"); 156 close(fd); 157 return (-1); 158 } 159 160 disk->d_bsize = 1; 161 disk->d_ccg = 0; 162 disk->d_fd = fd; 163 disk->d_inomin = 0; 164 disk->d_inomax = 0; 165 disk->d_lcg = 0; 166 disk->d_mine = 0; 167 disk->d_ufs = 0; 168 disk->d_error = NULL; 169 disk->d_si = NULL; 170 disk->d_sblockloc = UFS_STDSB; 171 disk->d_lookupflags = 0; 172 173 if (oname != name) { 174 name = strdup(name); 175 if (name == NULL) { 176 ERROR(disk, "could not allocate memory for disk name"); 177 return (-1); 178 } 179 disk->d_mine |= MINE_NAME; 180 } 181 disk->d_name = name; 182 183 return (0); 184 } 185 186 int 187 ufs_disk_write(struct uufsd *disk) 188 { 189 int fd; 190 191 ERROR(disk, NULL); 192 193 if (disk->d_mine & MINE_WRITE) 194 return (0); 195 196 fd = open(disk->d_name, O_RDWR); 197 if (fd < 0) { 198 ERROR(disk, "failed to open disk for writing"); 199 return (-1); 200 } 201 202 close(disk->d_fd); 203 disk->d_fd = fd; 204 disk->d_mine |= MINE_WRITE; 205 206 return (0); 207 } 208