1 /* 2 * Copyright (c) 2002 Juli Mallett. All rights reserved. 3 * 4 * This software was written by Juli Mallett <jmallett@FreeBSD.org> for the 5 * FreeBSD project. Redistribution and use in source and binary forms, with 6 * or without modification, are permitted provided that the following 7 * conditions are met: 8 * 9 * 1. Redistribution of source code must retain the above copyright notice, 10 * this list of conditions and the following disclaimer. 11 * 2. Redistribution in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 17 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 18 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, 19 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 20 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 21 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 23 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING 24 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 25 * POSSIBILITY OF SUCH DAMAGE. 26 */ 27 28 #include <sys/cdefs.h> 29 __FBSDID("$FreeBSD$"); 30 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/ufsmount.h> 37 #include <ufs/ufs/dinode.h> 38 #include <ufs/ffs/fs.h> 39 40 #include <errno.h> 41 #include <fcntl.h> 42 #include <fstab.h> 43 #include <paths.h> 44 #include <stdio.h> 45 #include <stdlib.h> 46 #include <string.h> 47 #include <unistd.h> 48 49 #include <libufs.h> 50 51 /* Internally, track the 'name' value, it's ours. */ 52 #define MINE_NAME 0x01 53 /* Track if its fd points to a writable device. */ 54 #define MINE_WRITE 0x02 55 56 int 57 ufs_disk_close(struct uufsd *disk) 58 { 59 ERROR(disk, NULL); 60 close(disk->d_fd); 61 if (disk->d_inoblock != NULL) { 62 free(disk->d_inoblock); 63 disk->d_inoblock = NULL; 64 } 65 if (disk->d_mine & MINE_NAME) { 66 free((char *)(uintptr_t)disk->d_name); 67 disk->d_name = NULL; 68 } 69 return (0); 70 } 71 72 int 73 ufs_disk_fillout(struct uufsd *disk, const char *name) 74 { 75 if (ufs_disk_fillout_blank(disk, name) == -1) { 76 return (-1); 77 } 78 if (sbread(disk) == -1) { 79 ERROR(disk, "could not read superblock to fill out disk"); 80 return (-1); 81 } 82 return (0); 83 } 84 85 int 86 ufs_disk_fillout_blank(struct uufsd *disk, const char *name) 87 { 88 struct stat st; 89 struct fstab *fs; 90 struct statfs sfs; 91 const char *oname; 92 char dev[MAXPATHLEN]; 93 int fd, ret; 94 95 ERROR(disk, NULL); 96 97 oname = name; 98 again: if ((ret = stat(name, &st)) < 0) { 99 if (*name != '/') { 100 snprintf(dev, sizeof(dev), "%s%s", _PATH_DEV, name); 101 name = dev; 102 goto again; 103 } 104 /* 105 * The given object doesn't exist, but don't panic just yet - 106 * it may be still mount point listed in /etc/fstab, but without 107 * existing corresponding directory. 108 */ 109 name = oname; 110 } 111 if (ret >= 0 && S_ISREG(st.st_mode)) { 112 /* Possibly a disk image, give it a try. */ 113 ; 114 } else if (ret >= 0 && S_ISCHR(st.st_mode)) { 115 /* This is what we need, do nothing. */ 116 ; 117 } else if ((fs = getfsfile(name)) != NULL) { 118 /* 119 * The given mount point is listed in /etc/fstab. 120 * It is possible that someone unmounted file system by hand 121 * and different file system is mounted on this mount point, 122 * but we still prefer /etc/fstab entry, because on the other 123 * hand, there could be /etc/fstab entry for this mount 124 * point, but file system is not mounted yet (eg. noauto) and 125 * statfs(2) will point us at different file system. 126 */ 127 name = fs->fs_spec; 128 } else if (ret >= 0 && S_ISDIR(st.st_mode)) { 129 /* 130 * The mount point is not listed in /etc/fstab, so it may be 131 * file system mounted by hand. 132 */ 133 if (statfs(name, &sfs) < 0) { 134 ERROR(disk, "could not find special device"); 135 return (-1); 136 } 137 strlcpy(dev, sfs.f_mntfromname, sizeof(dev)); 138 name = dev; 139 } else { 140 ERROR(disk, "could not find special device"); 141 return (-1); 142 } 143 fd = open(name, O_RDONLY); 144 if (fd == -1) { 145 ERROR(disk, "could not open special device"); 146 return (-1); 147 } 148 149 disk->d_bsize = 1; 150 disk->d_ccg = 0; 151 disk->d_fd = fd; 152 disk->d_inoblock = NULL; 153 disk->d_inomin = 0; 154 disk->d_inomax = 0; 155 disk->d_lcg = 0; 156 disk->d_mine = 0; 157 disk->d_ufs = 0; 158 disk->d_error = NULL; 159 160 if (oname != name) { 161 name = strdup(name); 162 if (name == NULL) { 163 ERROR(disk, "could not allocate memory for disk name"); 164 return (-1); 165 } 166 disk->d_mine |= MINE_NAME; 167 } 168 disk->d_name = name; 169 170 return (0); 171 } 172 173 int 174 ufs_disk_write(struct uufsd *disk) 175 { 176 ERROR(disk, NULL); 177 178 if (disk->d_mine & MINE_WRITE) 179 return (0); 180 181 close(disk->d_fd); 182 183 disk->d_fd = open(disk->d_name, O_RDWR); 184 if (disk->d_fd < 0) { 185 ERROR(disk, "failed to open disk for writing"); 186 return (-1); 187 } 188 189 disk->d_mine |= MINE_WRITE; 190 191 return (0); 192 } 193