1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 3 * 4 * Copyright (c) 2007 Pawel Jakub Dawidek <pjd@FreeBSD.org> 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 29 #include <sys/param.h> 30 #include <sys/disk.h> 31 #include <sys/stat.h> 32 33 #include <stdio.h> 34 #include <fcntl.h> 35 #include <errno.h> 36 #include <stdint.h> 37 #include <unistd.h> 38 #include <string.h> 39 #include <stdlib.h> 40 #include <paths.h> 41 42 #include <libgeom.h> 43 44 static char *g_device_path_open(const char *, int *, int); 45 46 /* 47 * Open the given provider and at least check if this is a block device. 48 */ 49 int 50 g_open(const char *name, int dowrite) 51 { 52 char *path; 53 int fd; 54 55 path = g_device_path_open(name, &fd, dowrite); 56 if (path != NULL) 57 free(path); 58 return (fd); 59 } 60 61 int 62 g_close(int fd) 63 { 64 65 return (close(fd)); 66 } 67 68 static int 69 g_ioctl_arg(int fd, unsigned long cmd, void *arg) 70 { 71 int ret; 72 73 if (arg != NULL) 74 ret = ioctl(fd, cmd, arg); 75 else 76 ret = ioctl(fd, cmd); 77 return (ret >= 0 ? 0 : -1); 78 } 79 80 static int 81 g_ioctl(int fd, unsigned long cmd) 82 { 83 84 return (g_ioctl_arg(fd, cmd, NULL)); 85 } 86 87 /* 88 * Return media size of the given provider. 89 */ 90 off_t 91 g_mediasize(int fd) 92 { 93 off_t mediasize; 94 95 if (g_ioctl_arg(fd, DIOCGMEDIASIZE, &mediasize) == -1) 96 mediasize = -1; 97 return (mediasize); 98 } 99 100 /* 101 * Return sector size of the given provider. 102 */ 103 ssize_t 104 g_sectorsize(int fd) 105 { 106 u_int sectorsize; 107 108 if (g_ioctl_arg(fd, DIOCGSECTORSIZE, §orsize) == -1) 109 return (-1); 110 return ((ssize_t)sectorsize); 111 } 112 113 /* 114 * Return stripe size of the given provider. 115 */ 116 off_t 117 g_stripesize(int fd) 118 { 119 off_t stripesize; 120 121 if (g_ioctl_arg(fd, DIOCGSTRIPESIZE, &stripesize) == -1) 122 return (-1); 123 return (stripesize); 124 } 125 126 /* 127 * Return stripe size of the given provider. 128 */ 129 off_t 130 g_stripeoffset(int fd) 131 { 132 off_t stripeoffset; 133 134 if (g_ioctl_arg(fd, DIOCGSTRIPEOFFSET, &stripeoffset) == -1) 135 return (-1); 136 return (stripeoffset); 137 } 138 139 /* 140 * Return the correct provider name. 141 */ 142 char * 143 g_providername(int fd) 144 { 145 char name[MAXPATHLEN]; 146 147 if (g_ioctl_arg(fd, DIOCGPROVIDERNAME, name) == -1) 148 return (NULL); 149 return (strdup(name)); 150 } 151 152 /* 153 * Call BIO_FLUSH for the given provider. 154 */ 155 int 156 g_flush(int fd) 157 { 158 159 return (g_ioctl(fd, DIOCGFLUSH)); 160 } 161 162 /* 163 * Call BIO_DELETE for the given range. 164 */ 165 int 166 g_delete(int fd, off_t offset, off_t length) 167 { 168 off_t arg[2]; 169 170 arg[0] = offset; 171 arg[1] = length; 172 return (g_ioctl_arg(fd, DIOCGDELETE, arg)); 173 } 174 175 /* 176 * Return ID of the given provider. 177 */ 178 int 179 g_get_ident(int fd, char *ident, size_t size) 180 { 181 char lident[DISK_IDENT_SIZE]; 182 183 if (g_ioctl_arg(fd, DIOCGIDENT, lident) == -1) 184 return (-1); 185 if (lident[0] == '\0') { 186 errno = ENOENT; 187 return (-1); 188 } 189 if (strlcpy(ident, lident, size) >= size) { 190 errno = ENAMETOOLONG; 191 return (-1); 192 } 193 return (0); 194 } 195 196 /* 197 * Return name of the provider, which has the given ID. 198 */ 199 int 200 g_get_name(const char *ident, char *name, size_t size) 201 { 202 int fd; 203 204 fd = g_open_by_ident(ident, 0, name, size); 205 if (fd == -1) 206 return (-1); 207 g_close(fd); 208 return (0); 209 } 210 211 /* 212 * Find provider name by the given ID. 213 */ 214 int 215 g_open_by_ident(const char *ident, int dowrite, char *name, size_t size) 216 { 217 char lident[DISK_IDENT_SIZE]; 218 struct gmesh mesh; 219 struct gclass *mp; 220 struct ggeom *gp; 221 struct gprovider *pp; 222 int error, fd; 223 224 error = geom_gettree(&mesh); 225 if (error != 0) { 226 errno = error; 227 return (-1); 228 } 229 230 error = ENOENT; 231 fd = -1; 232 233 LIST_FOREACH(mp, &mesh.lg_class, lg_class) { 234 LIST_FOREACH(gp, &mp->lg_geom, lg_geom) { 235 LIST_FOREACH(pp, &gp->lg_provider, lg_provider) { 236 fd = g_open(pp->lg_name, dowrite); 237 if (fd == -1) 238 continue; 239 if (g_get_ident(fd, lident, 240 sizeof(lident)) == -1) { 241 g_close(fd); 242 continue; 243 } 244 if (strcmp(ident, lident) != 0) { 245 g_close(fd); 246 continue; 247 } 248 error = 0; 249 if (name != NULL && strlcpy(name, pp->lg_name, 250 size) >= size) { 251 error = ENAMETOOLONG; 252 g_close(fd); 253 } 254 goto end; 255 } 256 } 257 } 258 end: 259 geom_deletetree(&mesh); 260 if (error != 0) { 261 errno = error; 262 return (-1); 263 } 264 return (fd); 265 } 266 267 /* 268 * Return the device path device given a partial or full path to its node. 269 * A pointer can be provided, which will be set to an opened file descriptor of 270 * not NULL. 271 */ 272 static char * 273 g_device_path_open(const char *devpath, int *fdp, int dowrite) 274 { 275 char *path; 276 int fd; 277 278 /* Make sure that we can fail. */ 279 if (fdp != NULL) 280 *fdp = -1; 281 282 /* Use the device node if we're able to open it. */ 283 fd = open(devpath, dowrite ? O_RDWR : O_RDONLY); 284 if (fd != -1) { 285 if ((path = strdup(devpath)) == NULL) { 286 close(fd); 287 return (NULL); 288 } 289 goto fd_ok; 290 } 291 292 /* If we're not given an absolute path, assume /dev/ prefix. */ 293 if (*devpath == '/') 294 return (NULL); 295 296 asprintf(&path, "%s%s", _PATH_DEV, devpath); 297 if (path == NULL) 298 return (NULL); 299 fd = open(path, dowrite ? O_RDWR : O_RDONLY); 300 if (fd == -1) { 301 free(path); 302 return (NULL); 303 } 304 305 fd_ok: 306 /* 307 * Let try to get sectorsize, which will prove it is a GEOM provider. 308 */ 309 if (g_sectorsize(fd) == -1) { 310 free(path); 311 close(fd); 312 errno = EFTYPE; 313 return (NULL); 314 } 315 if (fdp != NULL) 316 *fdp = fd; 317 else 318 close(fd); 319 return (path); 320 } 321 322 char * 323 g_device_path(const char *devpath) 324 { 325 return (g_device_path_open(devpath, NULL, 0)); 326 } 327