1 /*- 2 * Copyright (c) 2007 Pawel Jakub Dawidek <pjd@FreeBSD.org> 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 */ 26 27 #include <sys/cdefs.h> 28 __FBSDID("$FreeBSD$"); 29 30 #include <sys/param.h> 31 #include <sys/disk.h> 32 #include <sys/stat.h> 33 34 #include <stdio.h> 35 #include <fcntl.h> 36 #include <errno.h> 37 #include <stdint.h> 38 #include <unistd.h> 39 #include <string.h> 40 #include <stdlib.h> 41 #include <paths.h> 42 43 #include <libgeom.h> 44 45 static char *g_device_path_open(const char *, int *, int); 46 47 /* 48 * Open the given provider and at least check if this is a block device. 49 */ 50 int 51 g_open(const char *name, int dowrite) 52 { 53 char *path; 54 int fd; 55 56 path = g_device_path_open(name, &fd, dowrite); 57 if (path != NULL) 58 free(path); 59 if (fd == -1) 60 return (-1); 61 return (fd); 62 } 63 64 int 65 g_close(int fd) 66 { 67 68 return (close(fd)); 69 } 70 71 static int 72 g_ioctl_arg(int fd, unsigned long cmd, void *arg) 73 { 74 int ret; 75 76 if (arg != NULL) 77 ret = ioctl(fd, cmd, arg); 78 else 79 ret = ioctl(fd, cmd); 80 return (ret >= 0 ? 0 : -1); 81 } 82 83 static int 84 g_ioctl(int fd, unsigned long cmd) 85 { 86 87 return (g_ioctl_arg(fd, cmd, NULL)); 88 } 89 90 /* 91 * Return media size of the given provider. 92 */ 93 off_t 94 g_mediasize(int fd) 95 { 96 off_t mediasize; 97 98 if (g_ioctl_arg(fd, DIOCGMEDIASIZE, &mediasize) == -1) 99 mediasize = -1; 100 return (mediasize); 101 } 102 103 /* 104 * Return sector size of the given provider. 105 */ 106 ssize_t 107 g_sectorsize(int fd) 108 { 109 u_int sectorsize; 110 111 if (g_ioctl_arg(fd, DIOCGSECTORSIZE, §orsize) == -1) 112 return (-1); 113 return ((ssize_t)sectorsize); 114 } 115 116 /* 117 * Return the correct provider name. 118 */ 119 char * 120 g_providername(int fd) 121 { 122 char name[MAXPATHLEN]; 123 124 if (g_ioctl_arg(fd, DIOCGPROVIDERNAME, name) == -1) 125 return (NULL); 126 return (strdup(name)); 127 } 128 129 /* 130 * Call BIO_FLUSH for the given provider. 131 */ 132 int 133 g_flush(int fd) 134 { 135 136 return (g_ioctl(fd, DIOCGFLUSH)); 137 } 138 139 /* 140 * Call BIO_DELETE for the given range. 141 */ 142 int 143 g_delete(int fd, off_t offset, off_t length) 144 { 145 off_t arg[2]; 146 147 arg[0] = offset; 148 arg[1] = length; 149 return (g_ioctl_arg(fd, DIOCGDELETE, arg)); 150 } 151 152 /* 153 * Return ID of the given provider. 154 */ 155 int 156 g_get_ident(int fd, char *ident, size_t size) 157 { 158 char lident[DISK_IDENT_SIZE]; 159 160 if (g_ioctl_arg(fd, DIOCGIDENT, lident) == -1) 161 return (-1); 162 if (lident[0] == '\0') { 163 errno = ENOENT; 164 return (-1); 165 } 166 if (strlcpy(ident, lident, size) >= size) { 167 errno = ENAMETOOLONG; 168 return (-1); 169 } 170 return (0); 171 } 172 173 /* 174 * Return name of the provider, which has the given ID. 175 */ 176 int 177 g_get_name(const char *ident, char *name, size_t size) 178 { 179 int fd; 180 181 fd = g_open_by_ident(ident, 0, name, size); 182 if (fd == -1) 183 return (-1); 184 g_close(fd); 185 return (0); 186 } 187 188 /* 189 * Find provider name by the given ID. 190 */ 191 int 192 g_open_by_ident(const char *ident, int dowrite, char *name, size_t size) 193 { 194 char lident[DISK_IDENT_SIZE]; 195 struct gmesh mesh; 196 struct gclass *mp; 197 struct ggeom *gp; 198 struct gprovider *pp; 199 int error, fd; 200 201 error = geom_gettree(&mesh); 202 if (error != 0) { 203 errno = error; 204 return (-1); 205 } 206 207 error = ENOENT; 208 fd = -1; 209 210 LIST_FOREACH(mp, &mesh.lg_class, lg_class) { 211 LIST_FOREACH(gp, &mp->lg_geom, lg_geom) { 212 LIST_FOREACH(pp, &gp->lg_provider, lg_provider) { 213 fd = g_open(pp->lg_name, dowrite); 214 if (fd == -1) 215 continue; 216 if (g_get_ident(fd, lident, 217 sizeof(lident)) == -1) { 218 g_close(fd); 219 continue; 220 } 221 if (strcmp(ident, lident) != 0) { 222 g_close(fd); 223 continue; 224 } 225 error = 0; 226 if (name != NULL && strlcpy(name, pp->lg_name, 227 size) >= size) { 228 error = ENAMETOOLONG; 229 g_close(fd); 230 } 231 goto end; 232 } 233 } 234 } 235 end: 236 geom_deletetree(&mesh); 237 if (error != 0) { 238 errno = error; 239 return (-1); 240 } 241 return (fd); 242 } 243 244 /* 245 * Return the device path device given a partial or full path to its node. 246 * A pointer can be provided, which will be set to an opened file descriptor of 247 * not NULL. 248 */ 249 static char * 250 g_device_path_open(const char *devpath, int *fdp, int dowrite) 251 { 252 char *path; 253 int fd; 254 255 /* Make sure that we can fail. */ 256 if (fdp != NULL) 257 *fdp = -1; 258 /* Use the device node if we're able to open it. */ 259 do { 260 fd = open(devpath, dowrite ? O_RDWR : O_RDONLY); 261 if (fd == -1) 262 break; 263 /* 264 * Let try to get sectorsize, which will prove it is a GEOM 265 * provider. 266 */ 267 if (g_sectorsize(fd) == -1) { 268 close(fd); 269 errno = EFTYPE; 270 return (NULL); 271 } 272 if ((path = strdup(devpath)) == NULL) { 273 close(fd); 274 return (NULL); 275 } 276 if (fdp != NULL) 277 *fdp = fd; 278 else 279 close(fd); 280 return (path); 281 } while (0); 282 283 /* If we're not given an absolute path, assume /dev/ prefix. */ 284 if (*devpath != '/') { 285 asprintf(&path, "%s%s", _PATH_DEV, devpath); 286 if (path == NULL) 287 return (NULL); 288 fd = open(path, dowrite ? O_RDWR : O_RDONLY); 289 if (fd == -1) { 290 free(path); 291 return (NULL); 292 } 293 /* 294 * Let try to get sectorsize, which will prove it is a GEOM 295 * provider. 296 */ 297 if (g_sectorsize(fd) == -1) { 298 free(path); 299 close(fd); 300 errno = EFTYPE; 301 return (NULL); 302 } 303 if (fdp != NULL) 304 *fdp = fd; 305 else 306 close(fd); 307 return (path); 308 } 309 return (NULL); 310 } 311 312 char * 313 g_device_path(const char *devpath) 314 { 315 return (g_device_path_open(devpath, NULL, 0)); 316 } 317