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 return (fd); 60 } 61 62 int 63 g_close(int fd) 64 { 65 66 return (close(fd)); 67 } 68 69 static int 70 g_ioctl_arg(int fd, unsigned long cmd, void *arg) 71 { 72 int ret; 73 74 if (arg != NULL) 75 ret = ioctl(fd, cmd, arg); 76 else 77 ret = ioctl(fd, cmd); 78 return (ret >= 0 ? 0 : -1); 79 } 80 81 static int 82 g_ioctl(int fd, unsigned long cmd) 83 { 84 85 return (g_ioctl_arg(fd, cmd, NULL)); 86 } 87 88 /* 89 * Return media size of the given provider. 90 */ 91 off_t 92 g_mediasize(int fd) 93 { 94 off_t mediasize; 95 96 if (g_ioctl_arg(fd, DIOCGMEDIASIZE, &mediasize) == -1) 97 mediasize = -1; 98 return (mediasize); 99 } 100 101 /* 102 * Return sector size of the given provider. 103 */ 104 ssize_t 105 g_sectorsize(int fd) 106 { 107 u_int sectorsize; 108 109 if (g_ioctl_arg(fd, DIOCGSECTORSIZE, §orsize) == -1) 110 return (-1); 111 return ((ssize_t)sectorsize); 112 } 113 114 /* 115 * Return stripe size of the given provider. 116 */ 117 off_t 118 g_stripesize(int fd) 119 { 120 off_t stripesize; 121 122 if (g_ioctl_arg(fd, DIOCGSTRIPESIZE, &stripesize) == -1) 123 return (-1); 124 return (stripesize); 125 } 126 127 /* 128 * Return stripe size of the given provider. 129 */ 130 off_t 131 g_stripeoffset(int fd) 132 { 133 off_t stripeoffset; 134 135 if (g_ioctl_arg(fd, DIOCGSTRIPEOFFSET, &stripeoffset) == -1) 136 return (-1); 137 return (stripeoffset); 138 } 139 140 /* 141 * Return the correct provider name. 142 */ 143 char * 144 g_providername(int fd) 145 { 146 char name[MAXPATHLEN]; 147 148 if (g_ioctl_arg(fd, DIOCGPROVIDERNAME, name) == -1) 149 return (NULL); 150 return (strdup(name)); 151 } 152 153 /* 154 * Call BIO_FLUSH for the given provider. 155 */ 156 int 157 g_flush(int fd) 158 { 159 160 return (g_ioctl(fd, DIOCGFLUSH)); 161 } 162 163 /* 164 * Call BIO_DELETE for the given range. 165 */ 166 int 167 g_delete(int fd, off_t offset, off_t length) 168 { 169 off_t arg[2]; 170 171 arg[0] = offset; 172 arg[1] = length; 173 return (g_ioctl_arg(fd, DIOCGDELETE, arg)); 174 } 175 176 /* 177 * Return ID of the given provider. 178 */ 179 int 180 g_get_ident(int fd, char *ident, size_t size) 181 { 182 char lident[DISK_IDENT_SIZE]; 183 184 if (g_ioctl_arg(fd, DIOCGIDENT, lident) == -1) 185 return (-1); 186 if (lident[0] == '\0') { 187 errno = ENOENT; 188 return (-1); 189 } 190 if (strlcpy(ident, lident, size) >= size) { 191 errno = ENAMETOOLONG; 192 return (-1); 193 } 194 return (0); 195 } 196 197 /* 198 * Return name of the provider, which has the given ID. 199 */ 200 int 201 g_get_name(const char *ident, char *name, size_t size) 202 { 203 int fd; 204 205 fd = g_open_by_ident(ident, 0, name, size); 206 if (fd == -1) 207 return (-1); 208 g_close(fd); 209 return (0); 210 } 211 212 /* 213 * Find provider name by the given ID. 214 */ 215 int 216 g_open_by_ident(const char *ident, int dowrite, char *name, size_t size) 217 { 218 char lident[DISK_IDENT_SIZE]; 219 struct gmesh mesh; 220 struct gclass *mp; 221 struct ggeom *gp; 222 struct gprovider *pp; 223 int error, fd; 224 225 error = geom_gettree(&mesh); 226 if (error != 0) { 227 errno = error; 228 return (-1); 229 } 230 231 error = ENOENT; 232 fd = -1; 233 234 LIST_FOREACH(mp, &mesh.lg_class, lg_class) { 235 LIST_FOREACH(gp, &mp->lg_geom, lg_geom) { 236 LIST_FOREACH(pp, &gp->lg_provider, lg_provider) { 237 fd = g_open(pp->lg_name, dowrite); 238 if (fd == -1) 239 continue; 240 if (g_get_ident(fd, lident, 241 sizeof(lident)) == -1) { 242 g_close(fd); 243 continue; 244 } 245 if (strcmp(ident, lident) != 0) { 246 g_close(fd); 247 continue; 248 } 249 error = 0; 250 if (name != NULL && strlcpy(name, pp->lg_name, 251 size) >= size) { 252 error = ENAMETOOLONG; 253 g_close(fd); 254 } 255 goto end; 256 } 257 } 258 } 259 end: 260 geom_deletetree(&mesh); 261 if (error != 0) { 262 errno = error; 263 return (-1); 264 } 265 return (fd); 266 } 267 268 /* 269 * Return the device path device given a partial or full path to its node. 270 * A pointer can be provided, which will be set to an opened file descriptor of 271 * not NULL. 272 */ 273 static char * 274 g_device_path_open(const char *devpath, int *fdp, int dowrite) 275 { 276 char *path; 277 int fd; 278 279 /* Make sure that we can fail. */ 280 if (fdp != NULL) 281 *fdp = -1; 282 283 /* Use the device node if we're able to open it. */ 284 fd = open(devpath, dowrite ? O_RDWR : O_RDONLY); 285 if (fd != -1) { 286 if ((path = strdup(devpath)) == NULL) { 287 close(fd); 288 return (NULL); 289 } 290 goto fd_ok; 291 } 292 293 /* If we're not given an absolute path, assume /dev/ prefix. */ 294 if (*devpath == '/') 295 return (NULL); 296 297 asprintf(&path, "%s%s", _PATH_DEV, devpath); 298 if (path == NULL) 299 return (NULL); 300 fd = open(path, dowrite ? O_RDWR : O_RDONLY); 301 if (fd == -1) { 302 free(path); 303 return (NULL); 304 } 305 306 fd_ok: 307 /* 308 * Let try to get sectorsize, which will prove it is a GEOM provider. 309 */ 310 if (g_sectorsize(fd) == -1) { 311 free(path); 312 close(fd); 313 errno = EFTYPE; 314 return (NULL); 315 } 316 if (fdp != NULL) 317 *fdp = fd; 318 else 319 close(fd); 320 return (path); 321 } 322 323 char * 324 g_device_path(const char *devpath) 325 { 326 return (g_device_path_open(devpath, NULL, 0)); 327 } 328