type.c revision 110066
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: head/lib/libufs/type.c 110066 2003-01-29 23:19:46Z jmallett $"); 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 56struct uufsd * 57ufs_disk_ctor(const char *name) 58{ 59 struct uufsd *new; 60 61 new = NULL; 62 63 ERROR(new, NULL); 64 65 new = malloc(sizeof(*new)); 66 if (new == NULL) { 67 ERROR(new, "unable to allocate memory for disk"); 68 return NULL; 69 } 70 71 if (ufs_disk_fillout(new, name) == -1) { 72 ERROR(new, "could not fill out disk"); 73 free(new); 74 return NULL; 75 } 76 77 return new; 78} 79 80void 81ufs_disk_dtor(struct uufsd **diskp) 82{ 83 struct uufsd *disk; 84 85 if (diskp != NULL) 86 disk = *diskp; 87 else 88 return; 89 90 ERROR(disk, NULL); 91 92 ufs_disk_close(disk); 93 free(disk); 94 *diskp = NULL; 95} 96 97int 98ufs_disk_close(struct uufsd *disk) 99{ 100 ERROR(disk, NULL); 101 close(disk->d_fd); 102 if (disk->d_inoblock != NULL) { 103 free(disk->d_inoblock); 104 disk->d_inoblock = NULL; 105 } 106 if (disk->d_mine & MINE_NAME) { 107 free((char *)(uintptr_t)disk->d_name); 108 disk->d_name = NULL; 109 } 110 return 0; 111} 112 113int 114ufs_disk_fillout(struct uufsd *disk, const char *name) 115{ 116 if (ufs_disk_fillout_blank(disk, name) == -1) { 117 return -1; 118 } 119 if (sbread(disk) == -1) { 120 ERROR(disk, "could not read superblock to fill out disk"); 121 return -1; 122 } 123} 124 125int 126ufs_disk_fillout_blank(struct uufsd *disk, const char *name) 127{ 128 struct stat st; 129 struct fstab *fs; 130 const char *oname; 131 char dev[MAXPATHLEN]; 132 int fd; 133 134 ERROR(disk, NULL); 135 136 oname = name; 137 fs = getfsfile(name); 138 if (fs != NULL) 139 name = fs->fs_spec; 140again: if (stat(name, &st) < 0) { 141 if (*name != '/') { 142 if (*name == 'r') 143 name++; 144 snprintf(dev, sizeof(dev), "%s%s", _PATH_DEV, name); 145 name = dev; 146 goto again; 147 } 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; 167 168 if (oname != name) { 169 name = strdup(name); 170 if (name == NULL) { 171 ERROR(disk, "could not allocate memory for disk name"); 172 return -1; 173 } 174 disk->d_mine |= MINE_NAME; 175 } 176 disk->d_name = name; 177 178 return 0; 179} 180 181int 182ufs_disk_write(struct uufsd *disk) 183{ 184 int rofd; 185 186 ERROR(disk, NULL); 187 188 if (disk->d_mine & MINE_WRITE) 189 return 0; 190 191 rofd = disk->d_fd; 192 193 disk->d_fd = open(disk->d_name, O_RDWR); 194 if (disk->d_fd < 0) { 195 ERROR(disk, "failed to open disk for writing"); 196 disk->d_fd = rofd; 197 return -1; 198 } 199 200 disk->d_mine |= MINE_WRITE; 201 202 return 0; 203} 204