| | 1 | /* |
| | 2 | * No copyright is claimed. This code is in the public domain; do with |
| | 3 | * it what you wish. |
| | 4 | * |
| | 5 | * Written by Karel Zak <kzak@redhat.com> [2011] |
| | 6 | */ |
| | 7 | #include <ctype.h> |
| | 8 | #include <libgen.h> |
| | 9 | #include <fcntl.h> |
| | 10 | #include <sys/stat.h> |
| | 11 | #include <unistd.h> |
| | 12 | |
| | 13 | #include "c.h" |
| | 14 | #include "cctype.h" |
| | 15 | #include "pathnames.h" |
| | 16 | #include "sysfs.h" |
| | 17 | #include "fileutils.h" |
| | 18 | #include "all-io.h" |
| | 19 | #include "debug.h" |
| | 20 | #include "strutils.h" |
| | 21 | #include "buffer.h" |
| | 22 | |
| | 23 | static void sysfs_blkdev_deinit_path(struct path_cxt *pc); |
| | 24 | static int sysfs_blkdev_enoent_redirect(struct path_cxt *pc, const char *path, int *dirfd); |
| | 25 | |
| | 26 | /* |
| | 27 | * Debug stuff (based on include/debug.h) |
| | 28 | */ |
| | 29 | static UL_DEBUG_DEFINE_MASK(ulsysfs); |
| | 30 | UL_DEBUG_DEFINE_MASKNAMES(ulsysfs) = UL_DEBUG_EMPTY_MASKNAMES; |
| | 31 | |
| | 32 | #define ULSYSFS_DEBUG_INIT (1 << 1) |
| | 33 | #define ULSYSFS_DEBUG_CXT (1 << 2) |
| | 34 | |
| | 35 | #define DBG(m, x) __UL_DBG(ulsysfs, ULSYSFS_DEBUG_, m, x) |
| | 36 | #define ON_DBG(m, x) __UL_DBG_CALL(ulsysfs, ULSYSFS_DEBUG_, m, x) |
| | 37 | |
| | 38 | #define UL_DEBUG_CURRENT_MASK UL_DEBUG_MASK(ulsysfs) |
| | 39 | #include "debugobj.h" |
| | 40 | |
| | 41 | void ul_sysfs_init_debug(void) |
| | 42 | { |
| | 43 | if (ulsysfs_debug_mask) |
| | 44 | return; |
| | 45 | __UL_INIT_DEBUG_FROM_ENV(ulsysfs, ULSYSFS_DEBUG_, 0, ULSYSFS_DEBUG); |
| | 46 | } |
| | 47 | |
| | 48 | struct path_cxt *ul_new_sysfs_path(dev_t devno, struct path_cxt *parent, const char *prefix) |
| | 49 | { |
| | 50 | struct path_cxt *pc = ul_new_path(NULL); |
| | 51 | |
| | 52 | if (!pc) |
| | 53 | return NULL; |
| | 54 | if (prefix) |
| | 55 | ul_path_set_prefix(pc, prefix); |
| | 56 | |
| | 57 | if (sysfs_blkdev_init_path(pc, devno, parent) != 0) { |
| | 58 | ul_unref_path(pc); |
| | 59 | return NULL; |
| | 60 | } |
| | 61 | |
| | 62 | DBG(CXT, ul_debugobj(pc, "alloc")); |
| | 63 | return pc; |
| | 64 | } |
| | 65 | |
| | 66 | /* |
| | 67 | * sysfs_blkdev_* is sysfs extension to ul_path_* API for block devices. |
| | 68 | * |
| | 69 | * The function is possible to call in loop and without sysfs_blkdev_deinit_path(). |
| | 70 | * The sysfs_blkdev_deinit_path() is automatically called by ul_unref_path(). |
| | 71 | * |
| | 72 | */ |
| | 73 | int sysfs_blkdev_init_path(struct path_cxt *pc, dev_t devno, struct path_cxt *parent) |
| | 74 | { |
| | 75 | struct sysfs_blkdev *blk; |
| | 76 | int rc; |
| | 77 | char buf[sizeof(_PATH_SYS_DEVBLOCK) |
| | 78 | + sizeof(stringify_value(UINT32_MAX)) * 2 |
| | 79 | + 3]; |
| | 80 | |
| | 81 | /* define path to devno stuff */ |
| | 82 | snprintf(buf, sizeof(buf), _PATH_SYS_DEVBLOCK "/%d:%d", major(devno), minor(devno)); |
| | 83 | rc = ul_path_set_dir(pc, buf); |
| | 84 | if (rc) |
| | 85 | return rc; |
| | 86 | |
| | 87 | /* make sure path exists */ |
| | 88 | rc = ul_path_get_dirfd(pc); |
| | 89 | if (rc < 0) |
| | 90 | return rc; |
| | 91 | |
| | 92 | /* initialize sysfs blkdev specific stuff */ |
| | 93 | blk = ul_path_get_dialect(pc); |
| | 94 | if (!blk) { |
| | 95 | DBG(CXT, ul_debugobj(pc, "alloc new sysfs handler")); |
| | 96 | blk = calloc(1, sizeof(struct sysfs_blkdev)); |
| | 97 | if (!blk) |
| | 98 | return -ENOMEM; |
| | 99 | |
| | 100 | ul_path_set_dialect(pc, blk, sysfs_blkdev_deinit_path); |
| | 101 | ul_path_set_enoent_redirect(pc, sysfs_blkdev_enoent_redirect); |
| | 102 | } |
| | 103 | |
| | 104 | DBG(CXT, ul_debugobj(pc, "init sysfs stuff")); |
| | 105 | |
| | 106 | blk->devno = devno; |
| | 107 | sysfs_blkdev_set_parent(pc, parent); |
| | 108 | |
| | 109 | return 0; |
| | 110 | } |
| | 111 | |
| | 112 | static void sysfs_blkdev_deinit_path(struct path_cxt *pc) |
| | 113 | { |
| | 114 | struct sysfs_blkdev *blk; |
| | 115 | |
| | 116 | if (!pc) |
| | 117 | return; |
| | 118 | |
| | 119 | DBG(CXT, ul_debugobj(pc, "deinit")); |
| | 120 | |
| | 121 | blk = ul_path_get_dialect(pc); |
| | 122 | if (!blk) |
| | 123 | return; |
| | 124 | |
| | 125 | ul_unref_path(blk->parent); |
| | 126 | free(blk); |
| | 127 | |
| | 128 | ul_path_set_dialect(pc, NULL, NULL); |
| | 129 | } |
| | 130 | |
| | 131 | int sysfs_blkdev_set_parent(struct path_cxt *pc, struct path_cxt *parent) |
| | 132 | { |
| | 133 | struct sysfs_blkdev *blk = ul_path_get_dialect(pc); |
| | 134 | |
| | 135 | if (!pc || !blk) |
| | 136 | return -EINVAL; |
| | 137 | |
| | 138 | if (blk->parent) { |
| | 139 | ul_unref_path(blk->parent); |
| | 140 | blk->parent = NULL; |
| | 141 | } |
| | 142 | |
| | 143 | if (parent) { |
| | 144 | ul_ref_path(parent); |
| | 145 | blk->parent = parent; |
| | 146 | } else |
| | 147 | blk->parent = NULL; |
| | 148 | |
| | 149 | DBG(CXT, ul_debugobj(pc, "new parent")); |
| | 150 | return 0; |
| | 151 | } |
| | 152 | |
| | 153 | struct path_cxt *sysfs_blkdev_get_parent(struct path_cxt *pc) |
| | 154 | { |
| | 155 | struct sysfs_blkdev *blk = ul_path_get_dialect(pc); |
| | 156 | return blk ? blk->parent : NULL; |
| | 157 | } |
| | 158 | |
| | 159 | /* |
| | 160 | * Redirects ENOENT errors to the parent. |
| | 161 | * For example |
| | 162 | * |
| | 163 | * /sys/dev/block/8:1/queue/logical_block_size redirects to |
| | 164 | * /sys/dev/block/8:0/queue/logical_block_size |
| | 165 | */ |
| | 166 | static int sysfs_blkdev_enoent_redirect(struct path_cxt *pc, const char *path, int *dirfd) |
| | 167 | { |
| | 168 | struct sysfs_blkdev *blk = ul_path_get_dialect(pc); |
| | 169 | |
| | 170 | if (blk && blk->parent && path) { |
| | 171 | *dirfd = ul_path_get_dirfd(blk->parent); |
| | 172 | if (*dirfd >= 0) { |
| | 173 | DBG(CXT, ul_debugobj(pc, "%s redirected to parent", path)); |
| | 174 | return 0; |
| | 175 | } |
| | 176 | } |
| | 177 | return 1; /* no redirect */ |
| | 178 | } |
| | 179 | |
| | 180 | char *sysfs_blkdev_get_name(struct path_cxt *pc, char *buf, size_t bufsiz) |
| | 181 | { |
| | 182 | char link[PATH_MAX]; |
| | 183 | char *name; |
| | 184 | ssize_t sz; |
| | 185 | |
| | 186 | /* read /sys/dev/block/<maj:min> link */ |
| | 187 | sz = ul_path_readlink(pc, link, sizeof(link), NULL); |
| | 188 | if (sz < 0) |
| | 189 | return NULL; |
| | 190 | |
| | 191 | name = strrchr(link, '/'); |
| | 192 | if (!name) |
| | 193 | return NULL; |
| | 194 | |
| | 195 | name++; |
| | 196 | sz = strlen(name); |
| | 197 | if ((size_t) sz + 1 > bufsiz) |
| | 198 | return NULL; |
| | 199 | |
| | 200 | memcpy(buf, name, sz + 1); |
| | 201 | sysfs_devname_sys_to_dev(buf); |
| | 202 | return buf; |
| | 203 | } |
| | 204 | |
| | 205 | int sysfs_blkdev_is_partition_dirent(DIR *dir, struct dirent *d, const char *parent_name) |
| | 206 | { |
| | 207 | char path[NAME_MAX + 6 + 1]; |
| | 208 | |
| | 209 | #ifdef _DIRENT_HAVE_D_TYPE |
| | 210 | if (d->d_type != DT_DIR && |
| | 211 | d->d_type != DT_LNK && |
| | 212 | d->d_type != DT_UNKNOWN) |
| | 213 | return 0; |
| | 214 | #endif |
| | 215 | size_t len = 0; |
| | 216 | |
| | 217 | if (parent_name) { |
| | 218 | const char *p = parent_name; |
| | 219 | |
| | 220 | /* /dev/sda --> "sda" */ |
| | 221 | if (*parent_name == '/') { |
| | 222 | p = strrchr(parent_name, '/'); |
| | 223 | if (!p) |
| | 224 | return 0; |
| | 225 | p++; |
| | 226 | } |
| | 227 | |
| | 228 | len = strlen(p); |
| | 229 | if ((strlen(d->d_name) <= len) || (strncmp(p, d->d_name, len) != 0)) |
| | 230 | len = 0; |
| | 231 | } |
| | 232 | |
| | 233 | if (len > 0) { |
| | 234 | /* partitions subdir name is |
| | 235 | * "<parent>[:digit:]" or "<parent>p[:digit:]" |
| | 236 | */ |
| | 237 | return ((*(d->d_name + len) == 'p' && isdigit(*(d->d_name + len + 1))) |
| | 238 | || isdigit(*(d->d_name + len))); |
| | 239 | } |
| | 240 | |
| | 241 | /* Cannot use /partition file, not supported on old sysfs */ |
| | 242 | snprintf(path, sizeof(path), "%s/start", d->d_name); |
| | 243 | |
| | 244 | return faccessat(dirfd(dir), path, R_OK, 0) == 0; |
| | 245 | } |
| | 246 | |
| | 247 | int sysfs_blkdev_count_partitions(struct path_cxt *pc, const char *devname) |
| | 248 | { |
| | 249 | DIR *dir; |
| | 250 | struct dirent *d; |
| | 251 | int r = 0; |
| | 252 | |
| | 253 | dir = ul_path_opendir(pc, NULL); |
| | 254 | if (!dir) |
| | 255 | return 0; |
| | 256 | |
| | 257 | while ((d = xreaddir(dir))) { |
| | 258 | if (sysfs_blkdev_is_partition_dirent(dir, d, devname)) |
| | 259 | r++; |
| | 260 | } |
| | 261 | |
| | 262 | closedir(dir); |
| | 263 | return r; |
| | 264 | } |
| | 265 | |
| | 266 | /* |
| | 267 | * Converts @partno (partition number) to devno of the partition. |
| | 268 | * The @pc handles wholedisk device. |
| | 269 | * |
| | 270 | * Note that this code does not expect any special format of the |
| | 271 | * partitions devnames. |
| | 272 | */ |
| | 273 | dev_t sysfs_blkdev_partno_to_devno(struct path_cxt *pc, int partno) |
| | 274 | { |
| | 275 | DIR *dir; |
| | 276 | struct dirent *d; |
| | 277 | dev_t devno = 0; |
| | 278 | |
| | 279 | dir = ul_path_opendir(pc, NULL); |
| | 280 | if (!dir) |
| | 281 | return 0; |
| | 282 | |
| | 283 | while ((d = xreaddir(dir))) { |
| | 284 | int n; |
| | 285 | |
| | 286 | if (!sysfs_blkdev_is_partition_dirent(dir, d, NULL)) |
| | 287 | continue; |
| | 288 | |
| | 289 | if (ul_path_readf_s32(pc, &n, "%s/partition", d->d_name)) |
| | 290 | continue; |
| | 291 | |
| | 292 | if (n == partno) { |
| | 293 | if (ul_path_readf_majmin(pc, &devno, "%s/dev", d->d_name) == 0) |
| | 294 | break; |
| | 295 | } |
| | 296 | } |
| | 297 | |
| | 298 | closedir(dir); |
| | 299 | DBG(CXT, ul_debugobj(pc, "partno (%d) -> devno (%d)", (int) partno, (int) devno)); |
| | 300 | return devno; |
| | 301 | } |
| | 302 | |
| | 303 | |
| | 304 | /* |
| | 305 | * Returns slave name if there is only one slave, otherwise returns NULL. |
| | 306 | * The result should be deallocated by free(). |
| | 307 | */ |
| | 308 | char *sysfs_blkdev_get_slave(struct path_cxt *pc) |
| | 309 | { |
| | 310 | DIR *dir; |
| | 311 | struct dirent *d; |
| | 312 | char *name = NULL; |
| | 313 | |
| | 314 | dir = ul_path_opendir(pc, "slaves"); |
| | 315 | if (!dir) |
| | 316 | return NULL; |
| | 317 | |
| | 318 | while ((d = xreaddir(dir))) { |
| | 319 | if (name) |
| | 320 | goto err; /* more slaves */ |
| | 321 | name = strdup(d->d_name); |
| | 322 | } |
| | 323 | |
| | 324 | closedir(dir); |
| | 325 | return name; |
| | 326 | err: |
| | 327 | free(name); |
| | 328 | closedir(dir); |
| | 329 | return NULL; |
| | 330 | } |
| | 331 | |
| | 332 | |
| | 333 | #define SUBSYSTEM_LINKNAME "/subsystem" |
| | 334 | |
| | 335 | /* |
| | 336 | * For example: |
| | 337 | * |
| | 338 | * chain: /sys/dev/block/../../devices/pci0000:00/0000:00:1a.0/usb1/1-1/1-1.2/ \ |
| | 339 | * 1-1.2:1.0/host65/target65:0:0/65:0:0:0/block/sdb |
| | 340 | * |
| | 341 | * The function check if <chain>/subsystem symlink exists, if yes then returns |
| | 342 | * basename of the readlink result, and remove the last subdirectory from the |
| | 343 | * <chain> path. |
| | 344 | */ |
| | 345 | static char *get_subsystem(char *chain, char *buf, size_t bufsz) |
| | 346 | { |
| | 347 | size_t len; |
| | 348 | char *p; |
| | 349 | |
| | 350 | if (!chain || !*chain) |
| | 351 | return NULL; |
| | 352 | |
| | 353 | len = strlen(chain); |
| | 354 | if (len + sizeof(SUBSYSTEM_LINKNAME) > PATH_MAX) |
| | 355 | return NULL; |
| | 356 | |
| | 357 | do { |
| | 358 | ssize_t sz; |
| | 359 | |
| | 360 | /* append "/subsystem" to the path */ |
| | 361 | memcpy(chain + len, SUBSYSTEM_LINKNAME, sizeof(SUBSYSTEM_LINKNAME)); |
| | 362 | |
| | 363 | /* try if subsystem symlink exists */ |
| | 364 | sz = readlink(chain, buf, bufsz - 1); |
| | 365 | |
| | 366 | /* remove last subsystem from chain */ |
| | 367 | chain[len] = '\0'; |
| | 368 | p = strrchr(chain, '/'); |
| | 369 | if (p) { |
| | 370 | *p = '\0'; |
| | 371 | len = p - chain; |
| | 372 | } |
| | 373 | |
| | 374 | if (sz > 0) { |
| | 375 | /* we found symlink to subsystem, return basename */ |
| | 376 | buf[sz] = '\0'; |
| | 377 | return basename(buf); |
| | 378 | } |
| | 379 | |
| | 380 | } while (p); |
| | 381 | |
| | 382 | return NULL; |
| | 383 | } |
| | 384 | |
| | 385 | /* |
| | 386 | * Returns complete path to the device, the path contains all subsystems |
| | 387 | * used for the device. |
| | 388 | */ |
| | 389 | char *sysfs_blkdev_get_devchain(struct path_cxt *pc, char *buf, size_t bufsz) |
| | 390 | { |
| | 391 | /* read /sys/dev/block/<maj>:<min> symlink */ |
| | 392 | ssize_t ssz; |
| | 393 | size_t sz = 0; |
| | 394 | struct ul_buffer tmp = UL_INIT_BUFFER; |
| | 395 | const char *p; |
| | 396 | char *res = NULL; |
| | 397 | |
| | 398 | ssz = ul_path_readlink(pc, buf, bufsz, NULL); |
| | 399 | if (ssz <= 0) |
| | 400 | return NULL; |
| | 401 | |
| | 402 | if ((p = ul_path_get_prefix(pc))) |
| | 403 | ul_buffer_append_string(&tmp, p); |
| | 404 | |
| | 405 | ul_buffer_append_string(&tmp, _PATH_SYS_DEVBLOCK "/"); |
| | 406 | ul_buffer_append_data(&tmp, buf, ssz); |
| | 407 | |
| | 408 | p = ul_buffer_get_string(&tmp, &sz, NULL); |
| | 409 | if (p && sz <= bufsz) { |
| | 410 | memcpy(buf, p, sz); |
| | 411 | res = buf; |
| | 412 | } |
| | 413 | ul_buffer_free_data(&tmp); |
| | 414 | return res; |
| | 415 | } |
| | 416 | |
| | 417 | /* |
| | 418 | * The @subsys returns the next subsystem in the chain. Function modifies |
| | 419 | * @devchain string. |
| | 420 | * |
| | 421 | * Returns: 0 in success, <0 on error, 1 on end of chain |
| | 422 | */ |
| | 423 | int sysfs_blkdev_next_subsystem(struct path_cxt *pc __attribute__((unused)), |
| | 424 | char *devchain, char **subsys) |
| | 425 | { |
| | 426 | char subbuf[PATH_MAX]; |
| | 427 | char *sub; |
| | 428 | |
| | 429 | if (!subsys || !devchain) |
| | 430 | return -EINVAL; |
| | 431 | |
| | 432 | *subsys = NULL; |
| | 433 | |
| | 434 | while ((sub = get_subsystem(devchain, subbuf, sizeof(subbuf)))) { |
| | 435 | *subsys = strdup(sub); |
| | 436 | if (!*subsys) |
| | 437 | return -ENOMEM; |
| | 438 | return 0; |
| | 439 | } |
| | 440 | |
| | 441 | return 1; |
| | 442 | } |
| | 443 | |
| | 444 | #define REMOVABLE_FILENAME "/removable" |
| | 445 | |
| | 446 | /* |
| | 447 | * For example: |
| | 448 | * |
| | 449 | * chain: /sys/dev/block/../../devices/pci0000:00/0000:00:1a.0/usb1/1-1/1-1.2/ \ |
| | 450 | * 1-1.2:1.0/host65/target65:0:0/65:0:0:0/block/sdb |
| | 451 | */ |
| | 452 | static int sysfs_devchain_is_removable(char *chain) |
| | 453 | { |
| | 454 | size_t len; |
| | 455 | char buf[20]; |
| | 456 | char *p; |
| | 457 | |
| | 458 | if (!chain || !*chain) |
| | 459 | return 0; |
| | 460 | |
| | 461 | len = strlen(chain); |
| | 462 | if (len + sizeof(REMOVABLE_FILENAME) > PATH_MAX) |
| | 463 | return 0; |
| | 464 | |
| | 465 | do { |
| | 466 | int fd, rc; |
| | 467 | |
| | 468 | /* append "/removable" to the path */ |
| | 469 | memcpy(chain + len, REMOVABLE_FILENAME, sizeof(REMOVABLE_FILENAME)); |
| | 470 | |
| | 471 | /* root of device hierarchy */ |
| | 472 | if (strcmp(chain, "/sys/dev/block" REMOVABLE_FILENAME) == 0) |
| | 473 | break; |
| | 474 | |
| | 475 | /* try to read it */ |
| | 476 | fd = open(chain, O_RDONLY); |
| | 477 | if (fd != -1) { |
| | 478 | rc = read_all(fd, buf, sizeof(buf)); |
| | 479 | close(fd); |
| | 480 | |
| | 481 | if (rc > 0) { |
| | 482 | if (strncmp(buf, "fixed", min(rc, 5)) == 0) { |
| | 483 | return 0; |
| | 484 | } else if (strncmp(buf, "removable", min(rc, 9)) == 0) { |
| | 485 | return 1; |
| | 486 | } |
| | 487 | } |
| | 488 | } |
| | 489 | |
| | 490 | /* remove last subsystem from chain */ |
| | 491 | chain[len] = '\0'; |
| | 492 | p = strrchr(chain, '/'); |
| | 493 | if (p) { |
| | 494 | *p = '\0'; |
| | 495 | len = p - chain; |
| | 496 | } |
| | 497 | |
| | 498 | } while (p); |
| | 499 | |
| | 500 | return 0; |
| | 501 | } |
| | 502 | |
| | 503 | int sysfs_blkdev_is_hotpluggable(struct path_cxt *pc) |
| | 504 | { |
| | 505 | char buf[PATH_MAX], *chain; |
| | 506 | |
| | 507 | chain = sysfs_blkdev_get_devchain(pc, buf, sizeof(buf)); |
| | 508 | return sysfs_devchain_is_removable(chain); |
| | 509 | } |
| | 510 | |
| | 511 | int sysfs_blkdev_is_removable(struct path_cxt *pc) |
| | 512 | { |
| | 513 | int rc = 0; |
| | 514 | |
| | 515 | // FIXME usb is not actually removable |
| | 516 | |
| | 517 | /* check /sys/dev/block/<maj>:<min>/removable attribute */ |
| | 518 | if (ul_path_read_s32(pc, &rc, "removable") == 0) |
| | 519 | return rc; |
| | 520 | |
| | 521 | return 0; |
| | 522 | } |
| | 523 | |
| | 524 | static int get_dm_wholedisk(struct path_cxt *pc, char *diskname, |
| | 525 | size_t len, dev_t *diskdevno) |
| | 526 | { |
| | 527 | int rc = 0; |
| | 528 | char *name; |
| | 529 | |
| | 530 | /* Note, sysfs_blkdev_get_slave() returns the first slave only, |
| | 531 | * if there is more slaves, then return NULL |
| | 532 | */ |
| | 533 | name = sysfs_blkdev_get_slave(pc); |
| | 534 | if (!name) |
| | 535 | return -1; |
| | 536 | |
| | 537 | if (diskname && len) |
| | 538 | xstrncpy(diskname, name, len); |
| | 539 | |
| | 540 | if (diskdevno) { |
| | 541 | *diskdevno = __sysfs_devname_to_devno(ul_path_get_prefix(pc), name, NULL); |
| | 542 | if (!*diskdevno) |
| | 543 | rc = -1; |
| | 544 | } |
| | 545 | |
| | 546 | free(name); |
| | 547 | return rc; |
| | 548 | } |
| | 549 | |
| | 550 | /* |
| | 551 | * Returns by @diskdevno whole disk device devno and (optionally) by |
| | 552 | * @diskname the whole disk device name. |
| | 553 | */ |
| | 554 | int sysfs_blkdev_get_wholedisk( struct path_cxt *pc, |
| | 555 | char *diskname, |
| | 556 | size_t len, |
| | 557 | dev_t *diskdevno) |
| | 558 | { |
| | 559 | int is_part = 0; |
| | 560 | |
| | 561 | if (!pc) |
| | 562 | return -1; |
| | 563 | |
| | 564 | is_part = ul_path_access(pc, F_OK, "partition") == 0; |
| | 565 | if (!is_part) { |
| | 566 | /* |
| | 567 | * Extra case for partitions mapped by device-mapper. |
| | 568 | * |
| | 569 | * All regular partitions (added by BLKPG ioctl or kernel PT |
| | 570 | * parser) have the /sys/.../partition file. The partitions |
| | 571 | * mapped by DM don't have such file, but they have "part" |
| | 572 | * prefix in DM UUID. |
| | 573 | */ |
| | 574 | char *uuid = NULL, *tmp, *prefix; |
| | 575 | |
| | 576 | ul_path_read_string(pc, &uuid, "dm/uuid"); |
| | 577 | tmp = uuid; |
| | 578 | prefix = uuid ? strsep(&tmp, "-") : NULL; |
| | 579 | |
| | 580 | if (prefix && c_strncasecmp(prefix, "part", 4) == 0) |
| | 581 | is_part = 1; |
| | 582 | free(uuid); |
| | 583 | |
| | 584 | if (is_part && |
| | 585 | get_dm_wholedisk(pc, diskname, len, diskdevno) == 0) |
| | 586 | /* |
| | 587 | * partitioned device, mapped by DM |
| | 588 | */ |
| | 589 | goto done; |
| | 590 | |
| | 591 | is_part = 0; |
| | 592 | } |
| | 593 | |
| | 594 | if (!is_part) { |
| | 595 | /* |
| | 596 | * unpartitioned device |
| | 597 | */ |
| | 598 | if (diskname && !sysfs_blkdev_get_name(pc, diskname, len)) |
| | 599 | goto err; |
| | 600 | if (diskdevno) |
| | 601 | *diskdevno = sysfs_blkdev_get_devno(pc); |
| | 602 | |
| | 603 | } else { |
| | 604 | /* |
| | 605 | * partitioned device |
| | 606 | * - readlink /sys/dev/block/8:1 = ../../block/sda/sda1 |
| | 607 | * - dirname ../../block/sda/sda1 = ../../block/sda |
| | 608 | * - basename ../../block/sda = sda |
| | 609 | */ |
| | 610 | char linkpath[PATH_MAX]; |
| | 611 | char *name; |
| | 612 | ssize_t linklen; |
| | 613 | |
| | 614 | linklen = ul_path_readlink(pc, linkpath, sizeof(linkpath), NULL); |
| | 615 | if (linklen < 0) |
| | 616 | goto err; |
| | 617 | |
| | 618 | stripoff_last_component(linkpath); /* dirname */ |
| | 619 | name = stripoff_last_component(linkpath); /* basename */ |
| | 620 | if (!name) |
| | 621 | goto err; |
| | 622 | |
| | 623 | sysfs_devname_sys_to_dev(name); |
| | 624 | if (diskname && len) |
| | 625 | xstrncpy(diskname, name, len); |
| | 626 | |
| | 627 | if (diskdevno) { |
| | 628 | *diskdevno = __sysfs_devname_to_devno(ul_path_get_prefix(pc), name, NULL); |
| | 629 | if (!*diskdevno) |
| | 630 | goto err; |
| | 631 | } |
| | 632 | } |
| | 633 | |
| | 634 | done: |
| | 635 | return 0; |
| | 636 | err: |
| | 637 | return -1; |
| | 638 | } |
| | 639 | |
| | 640 | int sysfs_devno_to_wholedisk(dev_t devno, char *diskname, |
| | 641 | size_t len, dev_t *diskdevno) |
| | 642 | { |
| | 643 | struct path_cxt *pc; |
| | 644 | int rc = 0; |
| | 645 | |
| | 646 | if (!devno) |
| | 647 | return -EINVAL; |
| | 648 | pc = ul_new_sysfs_path(devno, NULL, NULL); |
| | 649 | if (!pc) |
| | 650 | return -ENOMEM; |
| | 651 | |
| | 652 | rc = sysfs_blkdev_get_wholedisk(pc, diskname, len, diskdevno); |
| | 653 | ul_unref_path(pc); |
| | 654 | return rc; |
| | 655 | } |
| | 656 | |
| | 657 | /* |
| | 658 | * Returns 1 if the device is private device mapper device. The @uuid |
| | 659 | * (if not NULL) returns DM device UUID, use free() to deallocate. |
| | 660 | */ |
| | 661 | int sysfs_devno_is_dm_private(dev_t devno, char **uuid) |
| | 662 | { |
| | 663 | struct path_cxt *pc = NULL; |
| | 664 | char *id = NULL; |
| | 665 | int rc = 0; |
| | 666 | |
| | 667 | pc = ul_new_sysfs_path(devno, NULL, NULL); |
| | 668 | if (!pc) |
| | 669 | goto done; |
| | 670 | if (ul_path_read_string(pc, &id, "dm/uuid") <= 0 || !id) |
| | 671 | goto done; |
| | 672 | |
| | 673 | /* Private LVM devices use "LVM-<uuid>-<name>" uuid format (important |
| | 674 | * is the "LVM" prefix and "-<name>" postfix). |
| | 675 | */ |
| | 676 | if (strncmp(id, "LVM-", 4) == 0) { |
| | 677 | char *p = strrchr(id + 4, '-'); |
| | 678 | |
| | 679 | if (p && *(p + 1)) |
| | 680 | rc = 1; |
| | 681 | |
| | 682 | /* Private Stratis devices prefix the UUID with "stratis-1-private" |
| | 683 | */ |
| | 684 | } else if (strncmp(id, "stratis-1-private", 17) == 0) { |
| | 685 | rc = 1; |
| | 686 | } |
| | 687 | done: |
| | 688 | ul_unref_path(pc); |
| | 689 | if (uuid) |
| | 690 | *uuid = id; |
| | 691 | else |
| | 692 | free(id); |
| | 693 | return rc; |
| | 694 | } |
| | 695 | |
| | 696 | /* |
| | 697 | * Return 0 or 1, or < 0 in case of error |
| | 698 | */ |
| | 699 | int sysfs_devno_is_wholedisk(dev_t devno) |
| | 700 | { |
| | 701 | dev_t disk; |
| | 702 | |
| | 703 | if (sysfs_devno_to_wholedisk(devno, NULL, 0, &disk) != 0) |
| | 704 | return -1; |
| | 705 | |
| | 706 | return devno == disk; |
| | 707 | } |
| | 708 | |
| | 709 | |
| | 710 | int sysfs_blkdev_scsi_get_hctl(struct path_cxt *pc, int *h, int *c, int *t, int *l) |
| | 711 | { |
| | 712 | char buf[PATH_MAX], *hctl; |
| | 713 | struct sysfs_blkdev *blk; |
| | 714 | ssize_t len; |
| | 715 | |
| | 716 | blk = ul_path_get_dialect(pc); |
| | 717 | |
| | 718 | if (!blk || blk->hctl_error) |
| | 719 | return -EINVAL; |
| | 720 | if (blk->has_hctl) |
| | 721 | goto done; |
| | 722 | |
| | 723 | blk->hctl_error = 1; |
| | 724 | len = ul_path_readlink(pc, buf, sizeof(buf), "device"); |
| | 725 | if (len < 0) |
| | 726 | return len; |
| | 727 | |
| | 728 | hctl = strrchr(buf, '/'); |
| | 729 | if (!hctl) |
| | 730 | return -1; |
| | 731 | hctl++; |
| | 732 | |
| | 733 | if (sscanf(hctl, "%u:%u:%u:%u", &blk->scsi_host, &blk->scsi_channel, |
| | 734 | &blk->scsi_target, &blk->scsi_lun) != 4) |
| | 735 | return -1; |
| | 736 | |
| | 737 | blk->has_hctl = 1; |
| | 738 | done: |
| | 739 | if (h) |
| | 740 | *h = blk->scsi_host; |
| | 741 | if (c) |
| | 742 | *c = blk->scsi_channel; |
| | 743 | if (t) |
| | 744 | *t = blk->scsi_target; |
| | 745 | if (l) |
| | 746 | *l = blk->scsi_lun; |
| | 747 | |
| | 748 | blk->hctl_error = 0; |
| | 749 | return 0; |
| | 750 | } |
| | 751 | |
| | 752 | |
| | 753 | static char *scsi_host_attribute_path( |
| | 754 | struct path_cxt *pc, |
| | 755 | const char *type, |
| | 756 | char *buf, |
| | 757 | size_t bufsz, |
| | 758 | const char *attr) |
| | 759 | { |
| | 760 | int len; |
| | 761 | int host; |
| | 762 | const char *prefix; |
| | 763 | |
| | 764 | if (sysfs_blkdev_scsi_get_hctl(pc, &host, NULL, NULL, NULL)) |
| | 765 | return NULL; |
| | 766 | |
| | 767 | prefix = ul_path_get_prefix(pc); |
| | 768 | if (!prefix) |
| | 769 | prefix = ""; |
| | 770 | |
| | 771 | if (attr) |
| | 772 | len = snprintf(buf, bufsz, "%s%s/%s_host/host%d/%s", |
| | 773 | prefix, _PATH_SYS_CLASS, type, host, attr); |
| | 774 | else |
| | 775 | len = snprintf(buf, bufsz, "%s%s/%s_host/host%d", |
| | 776 | prefix, _PATH_SYS_CLASS, type, host); |
| | 777 | |
| | 778 | return (len < 0 || (size_t) len >= bufsz) ? NULL : buf; |
| | 779 | } |
| | 780 | |
| | 781 | char *sysfs_blkdev_scsi_host_strdup_attribute(struct path_cxt *pc, |
| | 782 | const char *type, const char *attr) |
| | 783 | { |
| | 784 | char buf[1024]; |
| | 785 | int rc; |
| | 786 | FILE *f; |
| | 787 | |
| | 788 | if (!attr || !type || |
| | 789 | !scsi_host_attribute_path(pc, type, buf, sizeof(buf), attr)) |
| | 790 | return NULL; |
| | 791 | |
| | 792 | if (!(f = fopen(buf, "r" UL_CLOEXECSTR))) |
| | 793 | return NULL; |
| | 794 | |
| | 795 | rc = fscanf(f, "%1023[^\n]", buf); |
| | 796 | fclose(f); |
| | 797 | |
| | 798 | return rc == 1 ? strdup(buf) : NULL; |
| | 799 | } |
| | 800 | |
| | 801 | int sysfs_blkdev_scsi_host_is(struct path_cxt *pc, const char *type) |
| | 802 | { |
| | 803 | char buf[PATH_MAX]; |
| | 804 | struct stat st; |
| | 805 | |
| | 806 | if (!type || !scsi_host_attribute_path(pc, type, |
| | 807 | buf, sizeof(buf), NULL)) |
| | 808 | return 0; |
| | 809 | |
| | 810 | return stat(buf, &st) == 0 && S_ISDIR(st.st_mode); |
| | 811 | } |
| | 812 | |
| | 813 | static char *scsi_attribute_path(struct path_cxt *pc, |
| | 814 | char *buf, size_t bufsz, const char *attr) |
| | 815 | { |
| | 816 | int len, h, c, t, l; |
| | 817 | const char *prefix; |
| | 818 | |
| | 819 | if (sysfs_blkdev_scsi_get_hctl(pc, &h, &c, &t, &l) != 0) |
| | 820 | return NULL; |
| | 821 | |
| | 822 | prefix = ul_path_get_prefix(pc); |
| | 823 | if (!prefix) |
| | 824 | prefix = ""; |
| | 825 | |
| | 826 | if (attr) |
| | 827 | len = snprintf(buf, bufsz, "%s%s/devices/%d:%d:%d:%d/%s", |
| | 828 | prefix, _PATH_SYS_SCSI, |
| | 829 | h,c,t,l, attr); |
| | 830 | else |
| | 831 | len = snprintf(buf, bufsz, "%s%s/devices/%d:%d:%d:%d", |
| | 832 | prefix, _PATH_SYS_SCSI, |
| | 833 | h,c,t,l); |
| | 834 | return (len < 0 || (size_t) len >= bufsz) ? NULL : buf; |
| | 835 | } |
| | 836 | |
| | 837 | int sysfs_blkdev_scsi_has_attribute(struct path_cxt *pc, const char *attr) |
| | 838 | { |
| | 839 | char path[PATH_MAX]; |
| | 840 | struct stat st; |
| | 841 | |
| | 842 | if (!scsi_attribute_path(pc, path, sizeof(path), attr)) |
| | 843 | return 0; |
| | 844 | |
| | 845 | return stat(path, &st) == 0; |
| | 846 | } |
| | 847 | |
| | 848 | int sysfs_blkdev_scsi_path_contains(struct path_cxt *pc, const char *pattern) |
| | 849 | { |
| | 850 | char path[PATH_MAX], linkc[PATH_MAX]; |
| | 851 | struct stat st; |
| | 852 | ssize_t len; |
| | 853 | |
| | 854 | if (!scsi_attribute_path(pc, path, sizeof(path), NULL)) |
| | 855 | return 0; |
| | 856 | |
| | 857 | if (stat(path, &st) != 0) |
| | 858 | return 0; |
| | 859 | |
| | 860 | len = readlink(path, linkc, sizeof(linkc) - 1); |
| | 861 | if (len < 0) |
| | 862 | return 0; |
| | 863 | |
| | 864 | linkc[len] = '\0'; |
| | 865 | return strstr(linkc, pattern) != NULL; |
| | 866 | } |
| | 867 | |
| | 868 | static dev_t read_devno(const char *path) |
| | 869 | { |
| | 870 | FILE *f; |
| | 871 | int maj = 0, min = 0; |
| | 872 | dev_t dev = 0; |
| | 873 | |
| | 874 | f = fopen(path, "r" UL_CLOEXECSTR); |
| | 875 | if (!f) |
| | 876 | return 0; |
| | 877 | |
| | 878 | if (fscanf(f, "%d:%d", &maj, &min) == 2) |
| | 879 | dev = makedev(maj, min); |
| | 880 | fclose(f); |
| | 881 | return dev; |
| | 882 | } |
| | 883 | |
| | 884 | int sysfs_devname_is_hidden(const char *prefix, const char *name) |
| | 885 | { |
| | 886 | char buf[PATH_MAX]; |
| | 887 | int rc = 0, hidden = 0, len; |
| | 888 | FILE *f; |
| | 889 | |
| | 890 | if (strncmp("/dev/", name, 5) == 0) |
| | 891 | return 0; |
| | 892 | |
| | 893 | if (!prefix) |
| | 894 | prefix = ""; |
| | 895 | /* |
| | 896 | * Create path to /sys/block/<name>/hidden |
| | 897 | */ |
| | 898 | len = snprintf(buf, sizeof(buf), |
| | 899 | "%s" _PATH_SYS_BLOCK "/%s/hidden", |
| | 900 | prefix, name); |
| | 901 | |
| | 902 | if (len < 0 || (size_t) len + 1 > sizeof(buf)) |
| | 903 | return 0; |
| | 904 | |
| | 905 | f = fopen(buf, "r" UL_CLOEXECSTR); |
| | 906 | if (!f) |
| | 907 | return 0; |
| | 908 | |
| | 909 | rc = fscanf(f, "%d", &hidden); |
| | 910 | fclose(f); |
| | 911 | |
| | 912 | return rc == 1 ? hidden : 0; |
| | 913 | } |
| | 914 | |
| | 915 | |
| | 916 | dev_t __sysfs_devname_to_devno(const char *prefix, const char *name, const char *parent) |
| | 917 | { |
| | 918 | char buf[PATH_MAX]; |
| | 919 | char *_name = NULL, *_parent = NULL; /* name as encoded in sysfs */ |
| | 920 | dev_t dev = 0; |
| | 921 | int len; |
| | 922 | |
| | 923 | if (!prefix) |
| | 924 | prefix = ""; |
| | 925 | |
| | 926 | assert(name); |
| | 927 | |
| | 928 | if (strncmp("/dev/", name, 5) == 0) { |
| | 929 | /* |
| | 930 | * Read from /dev |
| | 931 | */ |
| | 932 | struct stat st; |
| | 933 | |
| | 934 | if (stat(name, &st) == 0) { |
| | 935 | dev = st.st_rdev; |
| | 936 | goto done; |
| | 937 | } |
| | 938 | name += 5; /* unaccessible, or not node in /dev */ |
| | 939 | } |
| | 940 | |
| | 941 | _name = strdup(name); |
| | 942 | if (!_name) |
| | 943 | goto done; |
| | 944 | sysfs_devname_dev_to_sys(_name); |
| | 945 | |
| | 946 | if (parent) { |
| | 947 | _parent = strdup(parent); |
| | 948 | if (!_parent) |
| | 949 | goto done; |
| | 950 | } |
| | 951 | |
| | 952 | if (parent && strncmp("dm-", name, 3) != 0) { |
| | 953 | /* |
| | 954 | * Create path to /sys/block/<parent>/<name>/dev |
| | 955 | */ |
| | 956 | sysfs_devname_dev_to_sys(_parent); |
| | 957 | len = snprintf(buf, sizeof(buf), |
| | 958 | "%s" _PATH_SYS_BLOCK "/%s/%s/dev", |
| | 959 | prefix, _parent, _name); |
| | 960 | if (len < 0 || (size_t) len >= sizeof(buf)) |
| | 961 | goto done; |
| | 962 | |
| | 963 | /* don't try anything else for dm-* */ |
| | 964 | dev = read_devno(buf); |
| | 965 | goto done; |
| | 966 | } |
| | 967 | |
| | 968 | /* |
| | 969 | * Read from /sys/block/<sysname>/dev |
| | 970 | */ |
| | 971 | len = snprintf(buf, sizeof(buf), |
| | 972 | "%s" _PATH_SYS_BLOCK "/%s/dev", |
| | 973 | prefix, _name); |
| | 974 | if (len < 0 || (size_t) len >= sizeof(buf)) |
| | 975 | goto done; |
| | 976 | dev = read_devno(buf); |
| | 977 | |
| | 978 | /* |
| | 979 | * Read from /sys/block/<parent>/<partition>/dev |
| | 980 | */ |
| | 981 | if (!dev && parent && ul_startswith(name, parent)) { |
| | 982 | len = snprintf(buf, sizeof(buf), |
| | 983 | "%s" _PATH_SYS_BLOCK "/%s/%s/dev", |
| | 984 | prefix, _parent, _name); |
| | 985 | if (len < 0 || (size_t) len >= sizeof(buf)) |
| | 986 | goto done; |
| | 987 | dev = read_devno(buf); |
| | 988 | } |
| | 989 | |
| | 990 | /* |
| | 991 | * Read from /sys/block/<sysname>/device/dev |
| | 992 | */ |
| | 993 | if (!dev) { |
| | 994 | len = snprintf(buf, sizeof(buf), |
| | 995 | "%s" _PATH_SYS_BLOCK "/%s/device/dev", |
| | 996 | prefix, _name); |
| | 997 | if (len < 0 || (size_t) len >= sizeof(buf)) |
| | 998 | goto done; |
| | 999 | dev = read_devno(buf); |
| | 1000 | } |
| | 1001 | done: |
| | 1002 | free(_name); |
| | 1003 | free(_parent); |
| | 1004 | return dev; |
| | 1005 | } |
| | 1006 | |
| | 1007 | dev_t sysfs_devname_to_devno(const char *name) |
| | 1008 | { |
| | 1009 | return __sysfs_devname_to_devno(NULL, name, NULL); |
| | 1010 | } |
| | 1011 | |
| | 1012 | char *sysfs_blkdev_get_path(struct path_cxt *pc, char *buf, size_t bufsiz) |
| | 1013 | { |
| | 1014 | const char *name = sysfs_blkdev_get_name(pc, buf, bufsiz); |
| | 1015 | char *res = NULL; |
| | 1016 | size_t sz; |
| | 1017 | struct stat st; |
| | 1018 | |
| | 1019 | if (!name) |
| | 1020 | goto done; |
| | 1021 | |
| | 1022 | sz = strlen(name); |
| | 1023 | if (sz + sizeof("/dev/") > bufsiz) |
| | 1024 | goto done; |
| | 1025 | |
| | 1026 | /* create the final "/dev/<name>" string */ |
| | 1027 | memmove(buf + 5, name, sz + 1); |
| | 1028 | memcpy(buf, "/dev/", 5); |
| | 1029 | |
| | 1030 | if (!stat(buf, &st) && S_ISBLK(st.st_mode) && st.st_rdev == sysfs_blkdev_get_devno(pc)) |
| | 1031 | res = buf; |
| | 1032 | done: |
| | 1033 | return res; |
| | 1034 | } |
| | 1035 | |
| | 1036 | dev_t sysfs_blkdev_get_devno(struct path_cxt *pc) |
| | 1037 | { |
| | 1038 | return ((struct sysfs_blkdev *) ul_path_get_dialect(pc))->devno; |
| | 1039 | } |
| | 1040 | |
| | 1041 | /* |
| | 1042 | * Returns devname (e.g. "/dev/sda1") for the given devno. |
| | 1043 | * |
| | 1044 | * Please, use more robust blkid_devno_to_devname() in your applications. |
| | 1045 | */ |
| | 1046 | char *sysfs_devno_to_devpath(dev_t devno, char *buf, size_t bufsiz) |
| | 1047 | { |
| | 1048 | struct path_cxt *pc = ul_new_sysfs_path(devno, NULL, NULL); |
| | 1049 | char *res = NULL; |
| | 1050 | |
| | 1051 | if (pc) { |
| | 1052 | res = sysfs_blkdev_get_path(pc, buf, bufsiz); |
| | 1053 | ul_unref_path(pc); |
| | 1054 | } |
| | 1055 | return res; |
| | 1056 | } |
| | 1057 | |
| | 1058 | char *sysfs_devno_to_devname(dev_t devno, char *buf, size_t bufsiz) |
| | 1059 | { |
| | 1060 | struct path_cxt *pc = ul_new_sysfs_path(devno, NULL, NULL); |
| | 1061 | char *res = NULL; |
| | 1062 | |
| | 1063 | if (pc) { |
| | 1064 | res = sysfs_blkdev_get_name(pc, buf, bufsiz); |
| | 1065 | ul_unref_path(pc); |
| | 1066 | } |
| | 1067 | return res; |
| | 1068 | } |
| | 1069 | |
| | 1070 | int sysfs_devno_count_partitions(dev_t devno) |
| | 1071 | { |
| | 1072 | struct path_cxt *pc = ul_new_sysfs_path(devno, NULL, NULL); |
| | 1073 | int n = 0; |
| | 1074 | |
| | 1075 | if (pc) { |
| | 1076 | char buf[PATH_MAX + 1]; |
| | 1077 | char *name = sysfs_blkdev_get_name(pc, buf, sizeof(buf)); |
| | 1078 | |
| | 1079 | n = sysfs_blkdev_count_partitions(pc, name); |
| | 1080 | ul_unref_path(pc); |
| | 1081 | } |
| | 1082 | return n; |
| | 1083 | } |
| | 1084 | |
| | 1085 | char *sysfs_chrdev_devno_to_devname(dev_t devno, char *buf, size_t bufsiz) |
| | 1086 | { |
| | 1087 | char link[PATH_MAX]; |
| | 1088 | struct path_cxt *pc; |
| | 1089 | char *name; |
| | 1090 | ssize_t sz; |
| | 1091 | |
| | 1092 | pc = ul_new_path(_PATH_SYS_DEVCHAR "/%u:%u", major(devno), minor(devno)); |
| | 1093 | if (!pc) |
| | 1094 | return NULL; |
| | 1095 | |
| | 1096 | /* read /sys/dev/char/<maj:min> link */ |
| | 1097 | sz = ul_path_readlink(pc, link, sizeof(link), NULL); |
| | 1098 | ul_unref_path(pc); |
| | 1099 | |
| | 1100 | if (sz < 0) |
| | 1101 | return NULL; |
| | 1102 | |
| | 1103 | name = strrchr(link, '/'); |
| | 1104 | if (!name) |
| | 1105 | return NULL; |
| | 1106 | |
| | 1107 | name++; |
| | 1108 | sz = strlen(name); |
| | 1109 | if ((size_t) sz + 1 > bufsiz) |
| | 1110 | return NULL; |
| | 1111 | |
| | 1112 | memcpy(buf, name, sz + 1); |
| | 1113 | sysfs_devname_sys_to_dev(buf); |
| | 1114 | return buf; |
| | 1115 | |
| | 1116 | } |
| | 1117 | |
| | 1118 | enum sysfs_byteorder sysfs_get_byteorder(struct path_cxt *pc) |
| | 1119 | { |
| | 1120 | int rc; |
| | 1121 | char buf[BUFSIZ]; |
| | 1122 | enum sysfs_byteorder ret; |
| | 1123 | |
| | 1124 | rc = ul_path_read_buffer(pc, buf, sizeof(buf), _PATH_SYS_CPU_BYTEORDER); |
| | 1125 | if (rc < 0) |
| | 1126 | goto unknown; |
| | 1127 | |
| | 1128 | if (strncmp(buf, "little", sizeof(buf)) == 0) { |
| | 1129 | ret = SYSFS_BYTEORDER_LITTLE; |
| | 1130 | goto out; |
| | 1131 | } else if (strncmp(buf, "big", sizeof(buf)) == 0) { |
| | 1132 | ret = SYSFS_BYTEORDER_BIG; |
| | 1133 | goto out; |
| | 1134 | } |
| | 1135 | |
| | 1136 | unknown: |
| | 1137 | #if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__ |
| | 1138 | ret = SYSFS_BYTEORDER_LITTLE; |
| | 1139 | #elif __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__ |
| | 1140 | ret = SYSFS_BYTEORDER_BIG; |
| | 1141 | #else |
| | 1142 | #error Unknown byte order |
| | 1143 | #endif |
| | 1144 | |
| | 1145 | out: |
| | 1146 | return ret; |
| | 1147 | } |
| | 1148 | |
| | 1149 | int sysfs_get_address_bits(struct path_cxt *pc) |
| | 1150 | { |
| | 1151 | int rc; |
| | 1152 | int address_bits; |
| | 1153 | |
| | 1154 | rc = ul_path_scanf(pc, _PATH_SYS_ADDRESS_BITS, "%d", &address_bits); |
| | 1155 | if (rc < 0) |
| | 1156 | return rc; |
| | 1157 | if (address_bits < 0) |
| | 1158 | return -EINVAL; |
| | 1159 | return address_bits; |
| | 1160 | } |
| | 1161 | |
| | 1162 | |
| | 1163 | #ifdef TEST_PROGRAM_SYSFS |
| | 1164 | #include <errno.h> |
| | 1165 | #include <err.h> |
| | 1166 | #include <stdlib.h> |
| | 1167 | |
| | 1168 | int main(int argc, char *argv[]) |
| | 1169 | { |
| | 1170 | struct path_cxt *pc; |
| | 1171 | char *devname; |
| | 1172 | dev_t devno, disk_devno; |
| | 1173 | char path[PATH_MAX], *sub, *chain; |
| | 1174 | char diskname[32]; |
| | 1175 | int i, is_part, rc = EXIT_SUCCESS; |
| | 1176 | uint64_t u64; |
| | 1177 | |
| | 1178 | if (argc != 2) |
| | 1179 | errx(EXIT_FAILURE, "usage: %s <devname>", argv[0]); |
| | 1180 | |
| | 1181 | ul_sysfs_init_debug(); |
| | 1182 | |
| | 1183 | devname = argv[1]; |
| | 1184 | devno = sysfs_devname_to_devno(devname); |
| | 1185 | |
| | 1186 | if (!devno) |
| | 1187 | err(EXIT_FAILURE, "failed to read devno"); |
| | 1188 | |
| | 1189 | printf("non-context:\n"); |
| | 1190 | printf(" DEVNO: %u (%d:%d)\n", (unsigned int) devno, major(devno), minor(devno)); |
| | 1191 | printf(" DEVNAME: %s\n", sysfs_devno_to_devname(devno, path, sizeof(path))); |
| | 1192 | printf(" DEVPATH: %s\n", sysfs_devno_to_devpath(devno, path, sizeof(path))); |
| | 1193 | |
| | 1194 | sysfs_devno_to_wholedisk(devno, diskname, sizeof(diskname), &disk_devno); |
| | 1195 | printf(" WHOLEDISK-DEVNO: %u (%d:%d)\n", (unsigned int) disk_devno, major(disk_devno), minor(disk_devno)); |
| | 1196 | printf(" WHOLEDISK-DEVNAME: %s\n", diskname); |
| | 1197 | |
| | 1198 | pc = ul_new_sysfs_path(devno, NULL, NULL); |
| | 1199 | if (!pc) |
| | 1200 | goto done; |
| | 1201 | |
| | 1202 | printf("context based:\n"); |
| | 1203 | devno = sysfs_blkdev_get_devno(pc); |
| | 1204 | printf(" DEVNO: %u (%d:%d)\n", (unsigned int) devno, major(devno), minor(devno)); |
| | 1205 | printf(" DEVNAME: %s\n", sysfs_blkdev_get_name(pc, path, sizeof(path))); |
| | 1206 | printf(" DEVPATH: %s\n", sysfs_blkdev_get_path(pc, path, sizeof(path))); |
| | 1207 | |
| | 1208 | sysfs_devno_to_wholedisk(devno, diskname, sizeof(diskname), &disk_devno); |
| | 1209 | printf(" WHOLEDISK-DEVNO: %u (%d:%d)\n", (unsigned int) disk_devno, major(disk_devno), minor(disk_devno)); |
| | 1210 | printf(" WHOLEDISK-DEVNAME: %s\n", diskname); |
| | 1211 | |
| | 1212 | is_part = ul_path_access(pc, F_OK, "partition") == 0; |
| | 1213 | printf(" PARTITION: %s\n", is_part ? "YES" : "NOT"); |
| | 1214 | |
| | 1215 | if (is_part && disk_devno) { |
| | 1216 | struct path_cxt *disk_pc = ul_new_sysfs_path(disk_devno, NULL, NULL); |
| | 1217 | sysfs_blkdev_set_parent(pc, disk_pc); |
| | 1218 | |
| | 1219 | ul_unref_path(disk_pc); |
| | 1220 | } |
| | 1221 | |
| | 1222 | printf(" HOTPLUG: %s\n", sysfs_blkdev_is_hotpluggable(pc) ? "yes" : "no"); |
| | 1223 | printf(" REMOVABLE: %s\n", sysfs_blkdev_is_removable(pc) ? "yes" : "no"); |
| | 1224 | printf(" SLAVES: %d\n", ul_path_count_dirents(pc, "slaves")); |
| | 1225 | |
| | 1226 | if (!is_part) { |
| | 1227 | printf("First 5 partitions:\n"); |
| | 1228 | for (i = 1; i <= 5; i++) { |
| | 1229 | dev_t dev = sysfs_blkdev_partno_to_devno(pc, i); |
| | 1230 | if (dev) |
| | 1231 | printf("\t#%d %d:%d\n", i, major(dev), minor(dev)); |
| | 1232 | } |
| | 1233 | } |
| | 1234 | |
| | 1235 | if (ul_path_read_u64(pc, &u64, "size") != 0) |
| | 1236 | printf(" (!) read SIZE failed\n"); |
| | 1237 | else |
| | 1238 | printf(" SIZE: %jd\n", u64); |
| | 1239 | |
| | 1240 | if (ul_path_read_s32(pc, &i, "queue/hw_sector_size")) |
| | 1241 | printf(" (!) read SECTOR failed\n"); |
| | 1242 | else |
| | 1243 | printf(" SECTOR: %d\n", i); |
| | 1244 | |
| | 1245 | |
| | 1246 | chain = sysfs_blkdev_get_devchain(pc, path, sizeof(path)); |
| | 1247 | printf(" SUBSYSTEMS:\n"); |
| | 1248 | |
| | 1249 | while (chain && sysfs_blkdev_next_subsystem(pc, chain, &sub) == 0) { |
| | 1250 | printf("\t%s\n", sub); |
| | 1251 | free(sub); |
| | 1252 | } |
| | 1253 | |
| | 1254 | rc = EXIT_SUCCESS; |
| | 1255 | done: |
| | 1256 | ul_unref_path(pc); |
| | 1257 | return rc; |
| | 1258 | } |
| | 1259 | #endif /* TEST_PROGRAM_SYSFS */ |
projects / thirdparty / util-linux.git / blame_incremental