1 /* 2 * Copyright (C) 2013 Felix Fietkau <nbd@openwrt.org> 3 * Copyright (C) 2013 John Crispin <blogic@openwrt.org> 4 * 5 * This program is free software; you can redistribute it and/or modify 6 * it under the terms of the GNU Lesser General Public License version 2.1 7 * as published by the Free Software Foundation 8 * 9 * This program is distributed in the hope that it will be useful, 10 * but WITHOUT ANY WARRANTY; without even the implied warranty of 11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 12 * GNU General Public License for more details. 13 */ 14 15 #define _GNU_SOURCE 16 #include <getopt.h> 17 #include <stdio.h> 18 #include <unistd.h> 19 #include <syslog.h> 20 #include <libgen.h> 21 #include <glob.h> 22 #include <dirent.h> 23 #include <stdarg.h> 24 #include <string.h> 25 #include <errno.h> 26 #include <fcntl.h> 27 #include <limits.h> 28 29 #include <sys/stat.h> 30 #include <sys/types.h> 31 #include <sys/swap.h> 32 #include <sys/mount.h> 33 #include <sys/wait.h> 34 #include <sys/sysmacros.h> 35 36 #include <uci.h> 37 #include <uci_blob.h> 38 39 #include <libubox/avl-cmp.h> 40 #include <libubox/blobmsg_json.h> 41 #include <libubox/list.h> 42 #include <libubox/ulog.h> 43 #include <libubox/utils.h> 44 #include <libubox/vlist.h> 45 #include <libubus.h> 46 47 #include "probe.h" 48 49 #define AUTOFS_MOUNT_PATH "/tmp/run/blockd/" 50 51 #ifdef UBIFS_EXTROOT 52 #include "libubi/libubi.h" 53 #endif 54 55 enum { 56 TYPE_MOUNT, 57 TYPE_SWAP, 58 }; 59 60 enum { 61 TYPE_DEV, 62 TYPE_HOTPLUG, 63 TYPE_AUTOFS, 64 }; 65 66 struct mount { 67 struct vlist_node node; 68 int type; 69 70 char *target; 71 char *path; 72 char *options; 73 uint32_t flags; 74 char *uuid; 75 char *label; 76 char *device; 77 int extroot; 78 int autofs; 79 int overlay; 80 int disabled_fsck; 81 unsigned int prio; 82 }; 83 84 static struct vlist_tree mounts; 85 static struct blob_buf b; 86 static LIST_HEAD(devices); 87 static int anon_mount, anon_swap, auto_mount, auto_swap, check_fs; 88 static unsigned int delay_root; 89 90 enum { 91 CFG_ANON_MOUNT, 92 CFG_ANON_SWAP, 93 CFG_AUTO_MOUNT, 94 CFG_AUTO_SWAP, 95 CFG_DELAY_ROOT, 96 CFG_CHECK_FS, 97 __CFG_MAX 98 }; 99 100 static const struct blobmsg_policy config_policy[__CFG_MAX] = { 101 [CFG_ANON_SWAP] = { .name = "anon_swap", .type = BLOBMSG_TYPE_INT32 }, 102 [CFG_ANON_MOUNT] = { .name = "anon_mount", .type = BLOBMSG_TYPE_INT32 }, 103 [CFG_AUTO_SWAP] = { .name = "auto_swap", .type = BLOBMSG_TYPE_INT32 }, 104 [CFG_AUTO_MOUNT] = { .name = "auto_mount", .type = BLOBMSG_TYPE_INT32 }, 105 [CFG_DELAY_ROOT] = { .name = "delay_root", .type = BLOBMSG_TYPE_INT32 }, 106 [CFG_CHECK_FS] = { .name = "check_fs", .type = BLOBMSG_TYPE_INT32 }, 107 }; 108 109 enum { 110 MOUNT_UUID, 111 MOUNT_LABEL, 112 MOUNT_ENABLE, 113 MOUNT_TARGET, 114 MOUNT_DEVICE, 115 MOUNT_OPTIONS, 116 MOUNT_AUTOFS, 117 __MOUNT_MAX 118 }; 119 120 static const struct uci_blob_param_list config_attr_list = { 121 .n_params = __CFG_MAX, 122 .params = config_policy, 123 }; 124 125 static const struct blobmsg_policy mount_policy[__MOUNT_MAX] = { 126 [MOUNT_UUID] = { .name = "uuid", .type = BLOBMSG_TYPE_STRING }, 127 [MOUNT_LABEL] = { .name = "label", .type = BLOBMSG_TYPE_STRING }, 128 [MOUNT_DEVICE] = { .name = "device", .type = BLOBMSG_TYPE_STRING }, 129 [MOUNT_TARGET] = { .name = "target", .type = BLOBMSG_TYPE_STRING }, 130 [MOUNT_OPTIONS] = { .name = "options", .type = BLOBMSG_TYPE_STRING }, 131 [MOUNT_ENABLE] = { .name = "enabled", .type = BLOBMSG_TYPE_INT32 }, 132 [MOUNT_AUTOFS] = { .name = "autofs", .type = BLOBMSG_TYPE_INT32 }, 133 }; 134 135 static const struct uci_blob_param_list mount_attr_list = { 136 .n_params = __MOUNT_MAX, 137 .params = mount_policy, 138 }; 139 140 enum { 141 SWAP_ENABLE, 142 SWAP_UUID, 143 SWAP_LABEL, 144 SWAP_DEVICE, 145 SWAP_PRIO, 146 __SWAP_MAX 147 }; 148 149 static const struct blobmsg_policy swap_policy[__SWAP_MAX] = { 150 [SWAP_ENABLE] = { .name = "enabled", .type = BLOBMSG_TYPE_INT32 }, 151 [SWAP_UUID] = { .name = "uuid", .type = BLOBMSG_TYPE_STRING }, 152 [SWAP_LABEL] = { .name = "label", .type = BLOBMSG_TYPE_STRING }, 153 [SWAP_DEVICE] = { .name = "device", .type = BLOBMSG_TYPE_STRING }, 154 [SWAP_PRIO] = { .name = "priority", .type = BLOBMSG_TYPE_INT32 }, 155 }; 156 157 static const struct uci_blob_param_list swap_attr_list = { 158 .n_params = __SWAP_MAX, 159 .params = swap_policy, 160 }; 161 162 struct mount_flag { 163 const char *name; 164 int32_t flag; 165 }; 166 167 static const struct mount_flag mount_flags[] = { 168 { "sync", MS_SYNCHRONOUS }, 169 { "async", ~MS_SYNCHRONOUS }, 170 { "dirsync", MS_DIRSYNC }, 171 { "mand", MS_MANDLOCK }, 172 { "nomand", ~MS_MANDLOCK }, 173 { "atime", ~MS_NOATIME }, 174 { "noatime", MS_NOATIME }, 175 { "dev", ~MS_NODEV }, 176 { "nodev", MS_NODEV }, 177 { "diratime", ~MS_NODIRATIME }, 178 { "nodiratime", MS_NODIRATIME }, 179 { "exec", ~MS_NOEXEC }, 180 { "noexec", MS_NOEXEC }, 181 { "suid", ~MS_NOSUID }, 182 { "nosuid", MS_NOSUID }, 183 { "rw", ~MS_RDONLY }, 184 { "ro", MS_RDONLY }, 185 { "relatime", MS_RELATIME }, 186 { "norelatime", ~MS_RELATIME }, 187 { "strictatime", MS_STRICTATIME }, 188 { "acl", MS_POSIXACL }, 189 { "noacl", ~MS_POSIXACL }, 190 { "nouser_xattr", MS_NOUSER }, 191 { "user_xattr", ~MS_NOUSER }, 192 }; 193 194 static char *blobmsg_get_strdup(struct blob_attr *attr) 195 { 196 if (!attr) 197 return NULL; 198 199 return strdup(blobmsg_get_string(attr)); 200 } 201 202 static char *blobmsg_get_basename(struct blob_attr *attr) 203 { 204 if (!attr) 205 return NULL; 206 207 return strdup(basename(blobmsg_get_string(attr))); 208 } 209 210 static void parse_mount_options(struct mount *m, char *optstr) 211 { 212 int i; 213 bool is_flag; 214 char *p, *opts, *last; 215 216 m->flags = 0; 217 m->options = NULL; 218 219 if (!optstr || !*optstr) 220 return; 221 222 m->options = opts = calloc(1, strlen(optstr) + 1); 223 224 if (!m->options) 225 return; 226 227 p = last = optstr; 228 229 do { 230 p = strchr(p, ','); 231 232 if (p) 233 *p++ = 0; 234 235 for (i = 0, is_flag = false; i < ARRAY_SIZE(mount_flags); i++) { 236 if (!strcmp(last, mount_flags[i].name)) { 237 if (mount_flags[i].flag < 0) 238 m->flags &= (uint32_t)mount_flags[i].flag; 239 else 240 m->flags |= (uint32_t)mount_flags[i].flag; 241 is_flag = true; 242 break; 243 } 244 } 245 246 if (!is_flag) 247 opts += sprintf(opts, "%s%s", (opts > m->options) ? "," : "", last); 248 249 last = p; 250 251 } while (p); 252 253 free(optstr); 254 } 255 256 static int mount_add(struct uci_section *s) 257 { 258 struct blob_attr *tb[__MOUNT_MAX] = { 0 }; 259 struct mount *m; 260 261 blob_buf_init(&b, 0); 262 uci_to_blob(&b, s, &mount_attr_list); 263 blobmsg_parse(mount_policy, __MOUNT_MAX, tb, blob_data(b.head), blob_len(b.head)); 264 265 if (!tb[MOUNT_LABEL] && !tb[MOUNT_UUID] && !tb[MOUNT_DEVICE]) 266 return -1; 267 268 if (tb[MOUNT_ENABLE] && !blobmsg_get_u32(tb[MOUNT_ENABLE])) 269 return -1; 270 271 m = malloc(sizeof(struct mount)); 272 m->type = TYPE_MOUNT; 273 m->uuid = blobmsg_get_strdup(tb[MOUNT_UUID]); 274 m->label = blobmsg_get_strdup(tb[MOUNT_LABEL]); 275 m->target = blobmsg_get_strdup(tb[MOUNT_TARGET]); 276 m->device = blobmsg_get_basename(tb[MOUNT_DEVICE]); 277 if (tb[MOUNT_AUTOFS]) 278 m->autofs = blobmsg_get_u32(tb[MOUNT_AUTOFS]); 279 else 280 m->autofs = 0; 281 parse_mount_options(m, blobmsg_get_strdup(tb[MOUNT_OPTIONS])); 282 283 m->overlay = m->extroot = 0; 284 if (m->target && !strcmp(m->target, "/")) 285 m->extroot = 1; 286 if (m->target && !strcmp(m->target, "/overlay")) 287 m->extroot = m->overlay = 1; 288 289 if (m->target && *m->target != '/') { 290 ULOG_WARN("ignoring mount section %s due to invalid target '%s'\n", 291 s->e.name, m->target); 292 free(m); 293 return -1; 294 } 295 296 if (m->uuid) 297 vlist_add(&mounts, &m->node, m->uuid); 298 else if (m->label) 299 vlist_add(&mounts, &m->node, m->label); 300 else if (m->device) 301 vlist_add(&mounts, &m->node, m->device); 302 303 return 0; 304 } 305 306 static int swap_add(struct uci_section *s) 307 { 308 struct blob_attr *tb[__SWAP_MAX] = { 0 }; 309 struct mount *m; 310 311 blob_buf_init(&b, 0); 312 uci_to_blob(&b, s, &swap_attr_list); 313 blobmsg_parse(swap_policy, __SWAP_MAX, tb, blob_data(b.head), blob_len(b.head)); 314 315 if (!tb[SWAP_UUID] && !tb[SWAP_LABEL] && !tb[SWAP_DEVICE]) 316 return -1; 317 318 m = malloc(sizeof(struct mount)); 319 memset(m, 0, sizeof(struct mount)); 320 m->type = TYPE_SWAP; 321 m->uuid = blobmsg_get_strdup(tb[SWAP_UUID]); 322 m->label = blobmsg_get_strdup(tb[SWAP_LABEL]); 323 m->device = blobmsg_get_basename(tb[SWAP_DEVICE]); 324 if (tb[SWAP_PRIO]) 325 m->prio = blobmsg_get_u32(tb[SWAP_PRIO]); 326 if (m->prio) 327 m->prio = ((m->prio << SWAP_FLAG_PRIO_SHIFT) & SWAP_FLAG_PRIO_MASK) | SWAP_FLAG_PREFER; 328 329 if ((!tb[SWAP_ENABLE]) || blobmsg_get_u32(tb[SWAP_ENABLE])) { 330 /* store complete swap path */ 331 if (tb[SWAP_DEVICE]) 332 m->target = blobmsg_get_strdup(tb[SWAP_DEVICE]); 333 334 if (m->uuid) 335 vlist_add(&mounts, &m->node, m->uuid); 336 else if (m->label) 337 vlist_add(&mounts, &m->node, m->label); 338 else if (m->device) 339 vlist_add(&mounts, &m->node, m->device); 340 } 341 342 return 0; 343 } 344 345 static int global_add(struct uci_section *s) 346 { 347 struct blob_attr *tb[__CFG_MAX] = { 0 }; 348 349 blob_buf_init(&b, 0); 350 uci_to_blob(&b, s, &config_attr_list); 351 blobmsg_parse(config_policy, __CFG_MAX, tb, blob_data(b.head), blob_len(b.head)); 352 353 if ((tb[CFG_ANON_MOUNT]) && blobmsg_get_u32(tb[CFG_ANON_MOUNT])) 354 anon_mount = 1; 355 if ((tb[CFG_ANON_SWAP]) && blobmsg_get_u32(tb[CFG_ANON_SWAP])) 356 anon_swap = 1; 357 358 if ((tb[CFG_AUTO_MOUNT]) && blobmsg_get_u32(tb[CFG_AUTO_MOUNT])) 359 auto_mount = 1; 360 if ((tb[CFG_AUTO_SWAP]) && blobmsg_get_u32(tb[CFG_AUTO_SWAP])) 361 auto_swap = 1; 362 363 if (tb[CFG_DELAY_ROOT]) 364 delay_root = blobmsg_get_u32(tb[CFG_DELAY_ROOT]); 365 366 if ((tb[CFG_CHECK_FS]) && blobmsg_get_u32(tb[CFG_CHECK_FS])) 367 check_fs = 1; 368 369 return 0; 370 } 371 372 static struct mount* find_swap(const char *uuid, const char *label, const char *device) 373 { 374 struct mount *m; 375 376 vlist_for_each_element(&mounts, m, node) { 377 if (m->type != TYPE_SWAP) 378 continue; 379 if (uuid && m->uuid && !strcasecmp(m->uuid, uuid)) 380 return m; 381 if (label && m->label && !strcmp(m->label, label)) 382 return m; 383 if (device && m->device && !strcmp(m->device, device)) 384 return m; 385 } 386 387 return NULL; 388 } 389 390 static struct mount* find_block(const char *uuid, const char *label, const char *device, 391 const char *target) 392 { 393 struct mount *m; 394 395 vlist_for_each_element(&mounts, m, node) { 396 if (m->type != TYPE_MOUNT) 397 continue; 398 if (m->uuid && uuid && !strcasecmp(m->uuid, uuid)) 399 return m; 400 if (m->label && label && !strcmp(m->label, label)) 401 return m; 402 if (m->target && target && !strcmp(m->target, target)) 403 return m; 404 if (m->device && device && !strcmp(m->device, device)) 405 return m; 406 } 407 408 return NULL; 409 } 410 411 static void mounts_update(struct vlist_tree *tree, struct vlist_node *node_new, 412 struct vlist_node *node_old) 413 { 414 } 415 416 static struct uci_package * config_try_load(struct uci_context *ctx, char *path) 417 { 418 char *file = basename(path); 419 char *dir = dirname(path); 420 char *err; 421 struct uci_package *pkg; 422 423 uci_set_confdir(ctx, dir); 424 ULOG_INFO("attempting to load %s/%s\n", dir, file); 425 426 if (uci_load(ctx, file, &pkg)) { 427 uci_get_errorstr(ctx, &err, file); 428 ULOG_ERR("unable to load configuration (%s)\n", err); 429 430 free(err); 431 return NULL; 432 } 433 434 return pkg; 435 } 436 437 static int config_load(char *cfg) 438 { 439 struct uci_context *ctx = uci_alloc_context(); 440 struct uci_package *pkg = NULL; 441 struct uci_element *e; 442 char path[64]; 443 444 vlist_init(&mounts, avl_strcmp, mounts_update); 445 446 if (cfg) { 447 snprintf(path, sizeof(path), "%s/upper/etc/config/fstab", cfg); 448 pkg = config_try_load(ctx, path); 449 450 if (!pkg) { 451 snprintf(path, sizeof(path), "%s/etc/config/fstab", cfg); 452 pkg = config_try_load(ctx, path); 453 } 454 } 455 456 if (!pkg) { 457 snprintf(path, sizeof(path), "/etc/config/fstab"); 458 pkg = config_try_load(ctx, path); 459 } 460 461 if (!pkg) { 462 ULOG_ERR("no usable configuration\n"); 463 return -1; 464 } 465 466 vlist_update(&mounts); 467 uci_foreach_element(&pkg->sections, e) { 468 struct uci_section *s = uci_to_section(e); 469 470 if (!strcmp(s->type, "mount")) 471 mount_add(s); 472 if (!strcmp(s->type, "swap")) 473 swap_add(s); 474 if (!strcmp(s->type, "global")) 475 global_add(s); 476 } 477 vlist_flush(&mounts); 478 479 return 0; 480 } 481 482 static bool mtdblock_is_nand(char *mtdnum) 483 { 484 char tmppath[64]; 485 char buf[16]; 486 FILE *fp; 487 488 snprintf(tmppath, sizeof(tmppath) - 1, "/sys/class/mtd/mtd%s/type", mtdnum); 489 fp = fopen(tmppath, "r"); 490 if (!fp) 491 return false; 492 493 if (!fgets(buf, sizeof(buf), fp)) { 494 fclose(fp); 495 return false; 496 } 497 fclose(fp); 498 buf[sizeof(buf) - 1] = '\0'; /* make sure buf is 0-terminated */ 499 buf[strlen(buf) - 1] = '\0'; /* strip final char (newline) */ 500 501 if (strcmp(buf, "nand")) 502 return false; 503 504 /* 505 * --- CUT HERE --- 506 * Keep probing rootfs and rootfs_data in the meantime to not break 507 * devices using JFFS2 on NAND but only trigger the kernel warnings. 508 * Remove this once all devices using JFFS2 and squashfs directly on 509 * NAND have been converted to UBI. 510 */ 511 snprintf(tmppath, sizeof(tmppath) - 1, "/sys/class/mtd/mtd%s/name", mtdnum); 512 fp = fopen(tmppath, "r"); 513 if (!fp) 514 return false; 515 516 if (!fgets(buf, sizeof(buf), fp)) { 517 fclose(fp); 518 return false; 519 } 520 fclose(fp); 521 buf[sizeof(buf) - 1] = '\0'; /* make sure buf is 0-terminated */ 522 buf[strlen(buf) - 1] = '\0'; /* strip final char (newline) */ 523 524 /* only return true if name differs from 'rootfs' and 'rootfs_data' */ 525 if (strcmp(buf, "rootfs") && strcmp(buf, "rootfs_data")) 526 return true; 527 528 /* --- CUT HERE --- */ 529 return false; 530 } 531 532 static struct probe_info* _probe_path(char *path) 533 { 534 struct probe_info *pr, *epr; 535 char tmppath[64]; 536 537 if (!strncmp(path, "/dev/mtdblock", 13) && mtdblock_is_nand(path + 13)) 538 return NULL; 539 540 pr = probe_path(path); 541 if (!pr) 542 return NULL; 543 544 if (path[5] == 'u' && path[6] == 'b' && path[7] == 'i' && 545 path[8] >= '' && path[8] <= '9' ) { 546 /* skip ubi device if not UBIFS (as it requires ubiblock) */ 547 if (strcmp("ubifs", pr->type)) 548 return NULL; 549 550 /* skip ubi device if ubiblock device is present */ 551 snprintf(tmppath, sizeof(tmppath), "/dev/ubiblock%s", path + 8); 552 list_for_each_entry(epr, &devices, list) 553 if (!strcmp(epr->dev, tmppath)) 554 return NULL; 555 } 556 557 return pr; 558 } 559 560 static int _cache_load(const char *path) 561 { 562 int gl_flags = GLOB_NOESCAPE | GLOB_MARK; 563 int j; 564 glob_t gl; 565 566 if (glob(path, gl_flags, NULL, &gl) < 0) 567 return -1; 568 569 for (j = 0; j < gl.gl_pathc; j++) { 570 struct probe_info *pr = _probe_path(gl.gl_pathv[j]); 571 if (pr) 572 list_add_tail(&pr->list, &devices); 573 } 574 575 globfree(&gl); 576 577 return 0; 578 } 579 580 static void cache_load(int mtd) 581 { 582 if (mtd) { 583 _cache_load("/dev/mtdblock*"); 584 _cache_load("/dev/ubiblock*"); 585 _cache_load("/dev/ubi[0-9]*"); 586 } 587 _cache_load("/dev/loop*"); 588 _cache_load("/dev/mmcblk*"); 589 _cache_load("/dev/sd*"); 590 _cache_load("/dev/hd*"); 591 _cache_load("/dev/md*"); 592 _cache_load("/dev/nvme*"); 593 _cache_load("/dev/vd*"); 594 _cache_load("/dev/xvd*"); 595 _cache_load("/dev/dm-*"); 596 _cache_load("/dev/fit*"); 597 } 598 599 600 static struct probe_info* find_block_info(char *uuid, char *label, char *path) 601 { 602 struct probe_info *pr = NULL; 603 604 if (uuid) 605 list_for_each_entry(pr, &devices, list) 606 if (pr->uuid && !strcasecmp(pr->uuid, uuid)) 607 return pr; 608 609 if (label) 610 list_for_each_entry(pr, &devices, list) 611 if (pr->label && !strcmp(pr->label, label)) 612 return pr; 613 614 if (path) 615 list_for_each_entry(pr, &devices, list) 616 if (pr->dev && !strcmp(basename(pr->dev), basename(path))) 617 return pr; 618 619 return NULL; 620 } 621 622 static char* find_mount_point(char *block) 623 { 624 FILE *fp = fopen("/proc/self/mountinfo", "r"); 625 static char line[256]; 626 char *point = NULL, *pos, *tmp, *cpoint, *devname; 627 struct stat s; 628 int rstat; 629 unsigned int minor, major; 630 631 if (!fp) 632 return NULL; 633 634 rstat = stat(block, &s); 635 636 while (fgets(line, sizeof(line), fp)) { 637 pos = strchr(line, ' '); 638 if (!pos) 639 continue; 640 641 pos = strchr(pos + 1, ' '); 642 if (!pos) 643 continue; 644 645 tmp = ++pos; 646 pos = strchr(pos, ':'); 647 if (!pos) 648 continue; 649 650 *pos = '\0'; 651 major = atoi(tmp); 652 tmp = ++pos; 653 pos = strchr(pos, ' '); 654 if (!pos) 655 continue; 656 657 *pos = '\0'; 658 minor = atoi(tmp); 659 pos = strchr(pos + 1, ' '); 660 if (!pos) 661 continue; 662 tmp = ++pos; 663 664 pos = strchr(pos, ' '); 665 if (!pos) 666 continue; 667 *pos = '\0'; 668 cpoint = tmp; 669 670 pos = strchr(pos + 1, ' '); 671 if (!pos) 672 continue; 673 674 pos = strchr(pos + 1, ' '); 675 if (!pos) 676 continue; 677 678 pos = strchr(pos + 1, ' '); 679 if (!pos) 680 continue; 681 682 tmp = ++pos; 683 pos = strchr(pos, ' '); 684 if (!pos) 685 continue; 686 687 *pos = '\0'; 688 devname = tmp; 689 if (!strcmp(block, devname)) { 690 point = strdup(cpoint); 691 break; 692 } 693 694 if (rstat) 695 continue; 696 697 if (!S_ISBLK(s.st_mode)) 698 continue; 699 700 if (major == major(s.st_rdev) && 701 minor == minor(s.st_rdev)) { 702 point = strdup(cpoint); 703 break; 704 } 705 } 706 707 fclose(fp); 708 709 return point; 710 } 711 712 static int print_block_uci(struct probe_info *pr) 713 { 714 if (!strcmp(pr->type, "swap")) { 715 printf("config 'swap'\n"); 716 } else { 717 char *mp = find_mount_point(pr->dev); 718 719 printf("config 'mount'\n"); 720 if (mp) { 721 printf("\toption\ttarget\t'%s'\n", mp); 722 free(mp); 723 } else { 724 printf("\toption\ttarget\t'/mnt/%s'\n", basename(pr->dev)); 725 } 726 } 727 if (pr->uuid) 728 printf("\toption\tuuid\t'%s'\n", pr->uuid); 729 else 730 printf("\toption\tdevice\t'%s'\n", pr->dev); 731 printf("\toption\tenabled\t''\n\n"); 732 733 return 0; 734 } 735 736 static int print_block_info(struct probe_info *pr) 737 { 738 static char *mp; 739 740 mp = find_mount_point(pr->dev); 741 printf("%s:", pr->dev); 742 if (pr->uuid) 743 printf(" UUID=\"%s\"", pr->uuid); 744 745 if (pr->label) 746 printf(" LABEL=\"%s\"", pr->label); 747 748 if (pr->version) 749 printf(" VERSION=\"%s\"", pr->version); 750 751 if (mp) { 752 printf(" MOUNT=\"%s\"", mp); 753 free(mp); 754 } 755 756 printf(" TYPE=\"%s\"\n", pr->type); 757 758 return 0; 759 } 760 761 static void check_filesystem(struct probe_info *pr) 762 { 763 pid_t pid; 764 struct stat statbuf; 765 const char *e2fsck = "/usr/sbin/e2fsck"; 766 const char *f2fsck = "/usr/sbin/fsck.f2fs"; 767 const char *fatfsck = "/usr/sbin/fsck.fat"; 768 const char *btrfsck = "/usr/bin/btrfsck"; 769 const char *ntfsck = "/usr/bin/ntfsfix"; 770 const char *ckfs; 771 772 /* UBIFS does not need stuff like fsck */ 773 if (!strncmp(pr->type, "ubifs", 5)) 774 return; 775 776 if (!strncmp(pr->type, "vfat", 4)) { 777 ckfs = fatfsck; 778 } else if (!strncmp(pr->type, "f2fs", 4)) { 779 ckfs = f2fsck; 780 } else if (!strncmp(pr->type, "ext", 3)) { 781 ckfs = e2fsck; 782 } else if (!strncmp(pr->type, "btrfs", 5)) { 783 ckfs = btrfsck; 784 } else if (!strncmp(pr->type, "ntfs", 4)) { 785 ckfs = ntfsck; 786 } else { 787 ULOG_ERR("check_filesystem: %s is not supported\n", pr->type); 788 return; 789 } 790 791 if (stat(ckfs, &statbuf) < 0) { 792 ULOG_ERR("check_filesystem: %s not found\n", ckfs); 793 return; 794 } 795 796 pid = fork(); 797 if (!pid) { 798 if(!strncmp(pr->type, "f2fs", 4)) { 799 execl(ckfs, ckfs, "-f", pr->dev, NULL); 800 exit(EXIT_FAILURE); 801 } else if(!strncmp(pr->type, "btrfs", 5)) { 802 execl(ckfs, ckfs, "--repair", pr->dev, NULL); 803 exit(EXIT_FAILURE); 804 } else if(!strncmp(pr->type, "ntfs", 4)) { 805 execl(ckfs, ckfs, "-b", pr->dev, NULL); 806 exit(EXIT_FAILURE); 807 } else { 808 execl(ckfs, ckfs, "-p", pr->dev, NULL); 809 exit(EXIT_FAILURE); 810 } 811 } else if (pid > 0) { 812 int status; 813 814 waitpid(pid, &status, 0); 815 if (WIFEXITED(status) && WEXITSTATUS(status)) 816 ULOG_ERR("check_filesystem: %s returned %d\n", ckfs, WEXITSTATUS(status)); 817 if (WIFSIGNALED(status)) 818 ULOG_ERR("check_filesystem: %s terminated by %s\n", ckfs, strsignal(WTERMSIG(status))); 819 } 820 } 821 822 static void handle_swapfiles(bool on) 823 { 824 struct stat s; 825 struct mount *m; 826 struct probe_info *pr; 827 828 vlist_for_each_element(&mounts, m, node) 829 { 830 if (m->type != TYPE_SWAP || !m->target) 831 continue; 832 833 if (stat(m->target, &s) || !S_ISREG(s.st_mode)) 834 continue; 835 836 pr = _probe_path(m->target); 837 838 if (!pr) 839 continue; 840 841 if (!strcmp(pr->type, "swap")) { 842 if (on) 843 swapon(pr->dev, m->prio); 844 else 845 swapoff(pr->dev); 846 } 847 848 free(pr); 849 } 850 } 851 852 static void to_devnull(int fd) 853 { 854 int devnull = open("/dev/null", fd ? O_WRONLY : O_RDONLY); 855 856 if (devnull >= 0) 857 dup2(devnull, fd); 858 859 if (devnull > STDERR_FILENO) 860 close(devnull); 861 } 862 863 static int exec_mount(const char *source, const char *target, 864 const char *fstype, const char *options) 865 { 866 pid_t pid; 867 struct stat s; 868 FILE *mount_fd; 869 int err, status, pfds[2]; 870 char errmsg[128], cmd[sizeof("/sbin/mount.XXXXXXXXXXXXXXXX\0")]; 871 872 snprintf(cmd, sizeof(cmd), "/sbin/mount.%s", fstype); 873 874 if (stat(cmd, &s) < 0 || !S_ISREG(s.st_mode) || !(s.st_mode & S_IXUSR)) { 875 ULOG_ERR("No \"mount.%s\" utility available\n", fstype); 876 return -1; 877 } 878 879 if (pipe(pfds) < 0) 880 return -1; 881 882 fcntl(pfds[0], F_SETFD, fcntl(pfds[0], F_GETFD) | FD_CLOEXEC); 883 fcntl(pfds[1], F_SETFD, fcntl(pfds[1], F_GETFD) | FD_CLOEXEC); 884 885 pid = vfork(); 886 887 switch (pid) { 888 case -1: 889 close(pfds[0]); 890 close(pfds[1]); 891 892 return -1; 893 894 case 0: 895 to_devnull(STDIN_FILENO); 896 to_devnull(STDOUT_FILENO); 897 898 dup2(pfds[1], STDERR_FILENO); 899 close(pfds[0]); 900 close(pfds[1]); 901 902 if (options && *options) 903 execl(cmd, cmd, "-o", options, source, target, NULL); 904 else 905 execl(cmd, cmd, source, target, NULL); 906 907 return -1; 908 909 default: 910 close(pfds[1]); 911 912 mount_fd = fdopen(pfds[0], "r"); 913 914 while (fgets(errmsg, sizeof(errmsg), mount_fd)) 915 ULOG_ERR("mount.%s: %s", fstype, errmsg); 916 917 fclose(mount_fd); 918 919 err = waitpid(pid, &status, 0); 920 921 if (err != -1) { 922 if (status != 0) { 923 ULOG_ERR("mount.%s: failed with status %d\n", fstype, status); 924 errno = EINVAL; 925 err = -1; 926 } else { 927 errno = 0; 928 err = 0; 929 } 930 } 931 932 break; 933 } 934 935 return err; 936 } 937 938 static const char * const ntfs_fs[] = { "ntfs3", "ntfs-3g", "antfs", "ntfs" }; 939 940 static int handle_mount(const char *source, const char *target, 941 const char *fstype, struct mount *m) 942 { 943 size_t mount_opts_len; 944 char *mount_opts = NULL, *ptr; 945 const char * const *filesystems; 946 int err = -EINVAL; 947 size_t count; 948 int i; 949 950 if (!strcmp(fstype, "ntfs")) { 951 filesystems = ntfs_fs; 952 count = ARRAY_SIZE(ntfs_fs); 953 } else { 954 filesystems = &fstype; 955 count = 1; 956 } 957 958 for (i = 0; i < count; i++) { 959 const char *fs = filesystems[i]; 960 961 err = mount(source, target, fs, m ? m->flags : 0, 962 (m && m->options) ? m->options : ""); 963 if (!err || errno != ENODEV) 964 break; 965 } 966 967 /* Requested file system type is not available in kernel, 968 attempt to call mount helper. */ 969 if (err == -1 && errno == ENODEV) { 970 if (m) { 971 /* Convert mount flags back into string representation, 972 first calculate needed length of string buffer... */ 973 mount_opts_len = 1 + (m->options ? strlen(m->options) : 0); 974 975 for (i = 0; i < ARRAY_SIZE(mount_flags); i++) 976 if ((mount_flags[i].flag > 0) && 977 (mount_flags[i].flag < INT_MAX) && 978 (m->flags & (uint32_t)mount_flags[i].flag)) 979 mount_opts_len += strlen(mount_flags[i].name) + 1; 980 981 /* ... then now allocate and fill it ... */ 982 ptr = mount_opts = calloc(1, mount_opts_len); 983 984 if (!ptr) { 985 errno = ENOMEM; 986 return -1; 987 } 988 989 if (m->options) 990 ptr += sprintf(ptr, "%s,", m->options); 991 992 for (i = 0; i < ARRAY_SIZE(mount_flags); i++) 993 if ((mount_flags[i].flag > 0) && 994 (mount_flags[i].flag < INT_MAX) && 995 (m->flags & (uint32_t)mount_flags[i].flag)) 996 ptr += sprintf(ptr, "%s,", mount_flags[i].name); 997 998 mount_opts[mount_opts_len - 1] = 0; 999 } 1000 1001 /* ... and now finally invoke the external mount program */ 1002 for (i = 0; i < count; i++) { 1003 const char *fs = filesystems[i]; 1004 1005 err = exec_mount(source, target, fs, mount_opts); 1006 if (!err) 1007 break; 1008 } 1009 } 1010 1011 free(mount_opts); 1012 1013 return err; 1014 } 1015 1016 static int blockd_notify(const char *method, char *device, struct mount *m, 1017 struct probe_info *pr) 1018 { 1019 struct ubus_context *ctx = ubus_connect(NULL); 1020 uint32_t id; 1021 int err; 1022 1023 if (!ctx) 1024 return -ENXIO; 1025 1026 if (!ubus_lookup_id(ctx, "block", &id)) { 1027 struct blob_buf buf = { 0 }; 1028 char *d = strrchr(device, '/'); 1029 1030 if (d) 1031 d++; 1032 else 1033 d = device; 1034 1035 blob_buf_init(&buf, 0); 1036 1037 if (m) { 1038 1039 blobmsg_add_string(&buf, "device", d); 1040 if (m->uuid) 1041 blobmsg_add_string(&buf, "uuid", m->uuid); 1042 if (m->label) 1043 blobmsg_add_string(&buf, "label", m->label); 1044 if (m->target) 1045 blobmsg_add_string(&buf, "target", m->target); 1046 if (m->options) 1047 blobmsg_add_string(&buf, "options", m->options); 1048 if (m->autofs) 1049 blobmsg_add_u32(&buf, "autofs", m->autofs); 1050 if (pr->type) 1051 blobmsg_add_string(&buf, "type", pr->type); 1052 if (pr->version) 1053 blobmsg_add_string(&buf, "version", pr->version); 1054 } else if (pr) { 1055 blobmsg_add_string(&buf, "device", d); 1056 if (pr->uuid) 1057 blobmsg_add_string(&buf, "uuid", pr->uuid); 1058 if (pr->label) 1059 blobmsg_add_string(&buf, "label", pr->label); 1060 if (pr->type) 1061 blobmsg_add_string(&buf, "type", pr->type); 1062 if (pr->version) 1063 blobmsg_add_string(&buf, "version", pr->version); 1064 blobmsg_add_u32(&buf, "anon", 1); 1065 } else { 1066 blobmsg_add_string(&buf, "device", d); 1067 blobmsg_add_u32(&buf, "remove", 1); 1068 } 1069 1070 err = ubus_invoke(ctx, id, method, buf.head, NULL, NULL, 3000); 1071 } else { 1072 err = -ENOENT; 1073 } 1074 1075 ubus_free(ctx); 1076 1077 return err; 1078 } 1079 1080 static int mount_device(struct probe_info *pr, int type) 1081 { 1082 struct mount *m; 1083 struct stat st; 1084 char *_target = NULL; 1085 char *target; 1086 char *device; 1087 char *mp; 1088 int err; 1089 1090 if (!pr) 1091 return -1; 1092 1093 device = basename(pr->dev); 1094 1095 if (!strcmp(pr->type, "swap")) { 1096 if ((type == TYPE_HOTPLUG) && !auto_swap) 1097 return -1; 1098 m = find_swap(pr->uuid, pr->label, device); 1099 if (m || anon_swap) 1100 swapon(pr->dev, (m) ? (m->prio) : (0)); 1101 1102 return 0; 1103 } 1104 1105 m = find_block(pr->uuid, pr->label, device, NULL); 1106 if (m && m->extroot) 1107 return -1; 1108 1109 mp = find_mount_point(pr->dev); 1110 if (mp) { 1111 if (m && m->type == TYPE_MOUNT && m->target && strcmp(m->target, mp)) { 1112 ULOG_ERR("%s is already mounted on %s\n", pr->dev, mp); 1113 err = -1; 1114 } else 1115 err = 0; 1116 free(mp); 1117 return err; 1118 } 1119 1120 if (type == TYPE_HOTPLUG) 1121 blockd_notify("hotplug", device, m, pr); 1122 1123 /* Check if device should be mounted & set the target directory */ 1124 if (m) { 1125 switch (type) { 1126 case TYPE_HOTPLUG: 1127 if (m->autofs) 1128 return 0; 1129 if (!auto_mount) 1130 return -1; 1131 break; 1132 case TYPE_AUTOFS: 1133 if (!m->autofs) 1134 return -1; 1135 break; 1136 case TYPE_DEV: 1137 if (m->autofs) 1138 return -1; 1139 break; 1140 } 1141 1142 if (m->autofs) { 1143 if (asprintf(&_target, "/tmp/run/blockd/%s", device) == -1) 1144 exit(ENOMEM); 1145 1146 target = _target; 1147 } else if (m->target) { 1148 target = m->target; 1149 } else { 1150 if (asprintf(&_target, "/mnt/%s", device) == -1) 1151 exit(ENOMEM); 1152 1153 target = _target; 1154 } 1155 } else if (anon_mount) { 1156 if (asprintf(&_target, "/mnt/%s", device) == -1) 1157 exit(ENOMEM); 1158 1159 target = _target; 1160 } else { 1161 /* No reason to mount this device */ 1162 return 0; 1163 } 1164 1165 /* Mount the device */ 1166 1167 if (check_fs) 1168 check_filesystem(pr); 1169 1170 mkdir_p(target, 0755); 1171 if (!lstat(target, &st) && S_ISLNK(st.st_mode)) 1172 unlink(target); 1173 1174 err = handle_mount(pr->dev, target, pr->type, m); 1175 if (err) { 1176 ULOG_ERR("mounting %s (%s) as %s failed (%d) - %m\n", 1177 pr->dev, pr->type, target, errno); 1178 1179 if (_target) 1180 free(_target); 1181 1182 return err; 1183 } 1184 1185 if (_target) 1186 free(_target); 1187 1188 handle_swapfiles(true); 1189 1190 if (type != TYPE_AUTOFS) 1191 blockd_notify("mount", device, NULL, NULL); 1192 1193 return 0; 1194 } 1195 1196 static int umount_device(char *path, int type, bool all) 1197 { 1198 char *mp, *devpath; 1199 int err; 1200 1201 if (strlen(path) > 5 && !strncmp("/dev/", path, 5)) { 1202 mp = find_mount_point(path); 1203 } else { 1204 devpath = malloc(strlen(path) + 6); 1205 strcpy(devpath, "/dev/"); 1206 strcat(devpath, path); 1207 mp = find_mount_point(devpath); 1208 free(devpath); 1209 } 1210 1211 if (!mp) 1212 return -1; 1213 if (!strcmp(mp, "/") && !all) { 1214 free(mp); 1215 return 0; 1216 } 1217 if (type != TYPE_AUTOFS) 1218 blockd_notify("umount", basename(path), NULL, NULL); 1219 1220 err = umount2(mp, MNT_DETACH); 1221 if (err) { 1222 ULOG_ERR("unmounting %s (%s) failed (%d) - %m\n", path, mp, 1223 errno); 1224 } else { 1225 ULOG_INFO("unmounted %s (%s)\n", path, mp); 1226 rmdir(mp); 1227 } 1228 1229 free(mp); 1230 return err; 1231 } 1232 1233 static int mount_action(char *action, char *device, int type) 1234 { 1235 char *path = NULL; 1236 struct probe_info *pr; 1237 1238 if (!action || !device) 1239 return -1; 1240 1241 if (!strcmp(action, "remove")) { 1242 if (type == TYPE_HOTPLUG) 1243 blockd_notify("hotplug", device, NULL, NULL); 1244 1245 umount_device(device, type, true); 1246 1247 return 0; 1248 } else if (strcmp(action, "add")) { 1249 ULOG_ERR("Unkown action %s\n", action); 1250 1251 return -1; 1252 } 1253 1254 if (config_load(NULL)) 1255 return -1; 1256 1257 cache_load(1); 1258 1259 list_for_each_entry(pr, &devices, list) 1260 if (!strcmp(basename(pr->dev), device)) 1261 path = pr->dev; 1262 1263 if (!path) 1264 return -1; 1265 1266 return mount_device(find_block_info(NULL, NULL, path), type); 1267 } 1268 1269 static int main_hotplug(int argc, char **argv) 1270 { 1271 return mount_action(getenv("ACTION"), getenv("DEVNAME"), TYPE_HOTPLUG); 1272 } 1273 1274 static int main_autofs(int argc, char **argv) 1275 { 1276 int err = 0; 1277 1278 if (argc < 3) 1279 return -1; 1280 1281 if (!strcmp(argv[2], "start")) { 1282 struct probe_info *pr; 1283 1284 if (config_load(NULL)) 1285 return -1; 1286 1287 cache_load(1); 1288 list_for_each_entry(pr, &devices, list) { 1289 struct mount *m; 1290 char *mp; 1291 1292 if (!strcmp(pr->type, "swap")) 1293 continue; 1294 1295 m = find_block(pr->uuid, pr->label, NULL, NULL); 1296 if (m && m->extroot) 1297 continue; 1298 1299 blockd_notify("hotplug", pr->dev, m, pr); 1300 if ((!m || !m->autofs) && (mp = find_mount_point(pr->dev))) { 1301 blockd_notify("mount", pr->dev, NULL, NULL); 1302 free(mp); 1303 } 1304 } 1305 } else { 1306 if (argc < 4) 1307 return -EINVAL; 1308 1309 err = mount_action(argv[2], argv[3], TYPE_AUTOFS); 1310 } 1311 1312 if (err) { 1313 ULOG_ERR("autofs: \"%s\" action has failed: %d\n", argv[2], err); 1314 } 1315 1316 return err; 1317 } 1318 1319 static int find_block_mtd(char *name, char *part, int plen) 1320 { 1321 FILE *fp = fopen("/proc/mtd", "r"); 1322 static char line[256]; 1323 char *index = NULL; 1324 1325 if(!fp) 1326 return -1; 1327 1328 while (!index && fgets(line, sizeof(line), fp)) { 1329 if (strstr(line, name)) { 1330 char *eol = strstr(line, ":"); 1331 1332 if (!eol) 1333 continue; 1334 1335 *eol = '\0'; 1336 index = &line[3]; 1337 } 1338 } 1339 1340 fclose(fp); 1341 1342 if (!index) 1343 return -1; 1344 1345 snprintf(part, plen, "/dev/mtdblock%s", index); 1346 1347 return 0; 1348 } 1349 1350 #ifdef UBIFS_EXTROOT 1351 static int find_ubi_vol(libubi_t libubi, char *name, int *dev_num, int *vol_id) 1352 { 1353 int dev = 0; 1354 1355 while (ubi_dev_present(libubi, dev)) 1356 { 1357 struct ubi_dev_info dev_info; 1358 struct ubi_vol_info vol_info; 1359 1360 if (ubi_get_dev_info1(libubi, dev++, &dev_info)) 1361 continue; 1362 if (ubi_get_vol_info1_nm(libubi, dev_info.dev_num, name, &vol_info)) 1363 continue; 1364 1365 *dev_num = dev_info.dev_num; 1366 *vol_id = vol_info.vol_id; 1367 1368 return 0; 1369 } 1370 1371 return -1; 1372 } 1373 1374 static int find_block_ubi(libubi_t libubi, char *name, char *part, int plen) 1375 { 1376 int dev_num; 1377 int vol_id; 1378 int err = -1; 1379 1380 err = find_ubi_vol(libubi, name, &dev_num, &vol_id); 1381 if (!err) 1382 snprintf(part, plen, "/dev/ubi%d_%d", dev_num, vol_id); 1383 1384 return err; 1385 } 1386 1387 static int find_block_ubi_RO(libubi_t libubi, char *name, char *part, int plen) 1388 { 1389 int dev_num; 1390 int vol_id; 1391 int err = -1; 1392 1393 err = find_ubi_vol(libubi, name, &dev_num, &vol_id); 1394 if (!err) 1395 snprintf(part, plen, "/dev/ubiblock%d_%d", dev_num, vol_id); 1396 1397 return err; 1398 } 1399 #endif 1400 1401 static int find_dev(const char *path, char *buf, int len) 1402 { 1403 DIR *d; 1404 dev_t root; 1405 struct stat s; 1406 struct dirent *e; 1407 1408 if (stat(path, &s)) 1409 return -1; 1410 1411 if (!(d = opendir("/dev"))) 1412 return -1; 1413 1414 root = s.st_dev; 1415 1416 while ((e = readdir(d)) != NULL) { 1417 snprintf(buf, len, "/dev/%s", e->d_name); 1418 1419 if (stat(buf, &s) || s.st_rdev != root) 1420 continue; 1421 1422 closedir(d); 1423 return 0; 1424 } 1425 1426 closedir(d); 1427 return -1; 1428 } 1429 1430 static int find_root_dev(char *buf, int len) 1431 { 1432 int err = find_dev("/", buf, len); 1433 if (err) 1434 err = find_dev("/rom", buf, len); 1435 1436 return err; 1437 } 1438 1439 static int test_fs_support(const char *name) 1440 { 1441 char line[128], *p; 1442 int rv = -1; 1443 FILE *f; 1444 1445 if ((f = fopen("/proc/filesystems", "r")) != NULL) { 1446 while (fgets(line, sizeof(line), f)) { 1447 p = strtok(line, "\t\n"); 1448 1449 if (p && !strcmp(p, "nodev")) 1450 p = strtok(NULL, "\t\n"); 1451 1452 if (p && !strcmp(p, name)) { 1453 rv = 0; 1454 break; 1455 } 1456 } 1457 fclose(f); 1458 } 1459 1460 return rv; 1461 } 1462 1463 /** 1464 * Check if mounted partition is a valid extroot 1465 * 1466 * @path target mount point 1467 * 1468 * Valid extroot partition has to contain /etc/.extroot-uuid with UUID of root 1469 * device. This function reads UUID and verifies it OR writes UUID to 1470 * .extroot-uuid if it doesn't exist yet (first extroot usage). 1471 */ 1472 static int check_extroot(char *path) 1473 { 1474 struct probe_info *pr = NULL; 1475 struct probe_info *tmp; 1476 struct stat s; 1477 char uuid[64] = { 0 }; 1478 char devpath[32]; 1479 char tag[64]; 1480 FILE *fp; 1481 int err; 1482 1483 snprintf(tag, sizeof(tag), "%s/etc/.extroot-default", path); 1484 if (stat(tag, &s)) 1485 return 0; 1486 1487 err = find_root_dev(devpath, sizeof(devpath)); 1488 if (err) 1489 err = find_block_mtd("\"rootfs\"", devpath, sizeof(devpath)); 1490 #ifdef UBIFS_EXTROOT 1491 if (err) { 1492 libubi_t libubi; 1493 1494 libubi = libubi_open(); 1495 err = find_block_ubi_RO(libubi, "rootfs", devpath, sizeof(devpath)); 1496 libubi_close(libubi); 1497 } 1498 #endif 1499 if (err) { 1500 ULOG_ERR("extroot: unable to determine root device\n"); 1501 return -1; 1502 } 1503 1504 /* Find root device probe_info so we know its UUID */ 1505 list_for_each_entry(tmp, &devices, list) { 1506 if (!strcmp(tmp->dev, devpath)) { 1507 pr = tmp; 1508 break; 1509 } 1510 } 1511 if (!pr) { 1512 ULOG_ERR("extroot: unable to lookup root device %s\n", devpath); 1513 return -1; 1514 } 1515 1516 snprintf(tag, sizeof(tag), "%s/etc", path); 1517 if (stat(tag, &s)) 1518 mkdir_p(tag, 0755); 1519 1520 snprintf(tag, sizeof(tag), "%s/etc/.extroot-uuid", path); 1521 if (stat(tag, &s)) { 1522 fp = fopen(tag, "w+"); 1523 if (!fp) { 1524 ULOG_ERR("extroot: failed to write UUID to %s: %d (%m)\n", 1525 tag, errno); 1526 /* return 0 to continue boot regardless of error */ 1527 return 0; 1528 } 1529 fputs(pr->uuid, fp); 1530 fclose(fp); 1531 return 0; 1532 } 1533 1534 fp = fopen(tag, "r"); 1535 if (!fp) { 1536 ULOG_ERR("extroot: failed to read UUID from %s: %d (%m)\n", tag, 1537 errno); 1538 return -1; 1539 } 1540 1541 if (!fgets(uuid, sizeof(uuid), fp)) 1542 ULOG_ERR("extroot: failed to read UUID from %s: %d (%m)\n", tag, 1543 errno); 1544 fclose(fp); 1545 1546 if (*uuid && !strcasecmp(uuid, pr->uuid)) 1547 return 0; 1548 1549 ULOG_ERR("extroot: UUID mismatch (root: %s, %s: %s)\n", pr->uuid, 1550 basename(path), uuid); 1551 return -1; 1552 } 1553 1554 /* 1555 * Read info about extroot from UCI (using prefix) and mount it. 1556 */ 1557 static int mount_extroot(char *cfg) 1558 { 1559 char overlay[] = "/tmp/extroot/overlay"; 1560 char mnt[] = "/tmp/extroot/mnt"; 1561 char *path = mnt; 1562 struct probe_info *pr; 1563 struct mount *m; 1564 int err = -1; 1565 1566 /* Load @cfg/etc/config/fstab */ 1567 if (config_load(cfg)) 1568 return -2; 1569 1570 /* See if there is extroot-specific mount config */ 1571 m = find_block(NULL, NULL, NULL, "/"); 1572 if (!m) 1573 m = find_block(NULL, NULL, NULL, "/overlay"); 1574 1575 if (!m || !m->extroot) 1576 { 1577 ULOG_INFO("extroot: not configured\n"); 1578 return -1; 1579 } 1580 1581 /* Find block device pointed by the mount config */ 1582 pr = find_block_info(m->uuid, m->label, m->device); 1583 1584 if (!pr && delay_root){ 1585 ULOG_INFO("extroot: device not present, retrying in %u seconds\n", delay_root); 1586 sleep(delay_root); 1587 make_devs(); 1588 cache_load(1); 1589 pr = find_block_info(m->uuid, m->label, m->device); 1590 } 1591 if (pr) { 1592 if (strncmp(pr->type, "ext", 3) && 1593 strncmp(pr->type, "f2fs", 4) && 1594 strncmp(pr->type, "btrfs", 5) && 1595 strncmp(pr->type, "ntfs", 4) && 1596 strncmp(pr->type, "ubifs", 5)) { 1597 ULOG_ERR("extroot: unsupported filesystem %s, try ext4, f2fs, btrfs, ntfs or ubifs\n", pr->type); 1598 return -1; 1599 } 1600 1601 if (test_fs_support(pr->type)) { 1602 ULOG_ERR("extroot: filesystem %s not supported by kernel\n", pr->type); 1603 return -1; 1604 } 1605 1606 if (m->overlay) 1607 path = overlay; 1608 mkdir_p(path, 0755); 1609 1610 if (check_fs) 1611 check_filesystem(pr); 1612 1613 err = mount(pr->dev, path, pr->type, m->flags, 1614 (m->options) ? (m->options) : ("")); 1615 1616 if (err) { 1617 ULOG_ERR("extroot: mounting %s (%s) on %s failed: %d (%m)\n", 1618 pr->dev, pr->type, path, errno); 1619 } else if (m->overlay) { 1620 err = check_extroot(path); 1621 if (err) 1622 umount(path); 1623 } 1624 } else { 1625 ULOG_ERR("extroot: cannot find device %s%s\n", 1626 (m->uuid ? "with UUID " : (m->label ? "with label " : "")), 1627 (m->uuid ? m->uuid : (m->label ? m->label : m->device))); 1628 } 1629 1630 return err; 1631 } 1632 1633 /** 1634 * Look for extroot config and mount it if present 1635 * 1636 * Look for /etc/config/fstab on all supported partitions and use it for 1637 * mounting extroot if specified. 1638 */ 1639 static int main_extroot(int argc, char **argv) 1640 { 1641 struct probe_info *pr; 1642 char blkdev_path[32] = { 0 }; 1643 int err = -1; 1644 #ifdef UBIFS_EXTROOT 1645 libubi_t libubi; 1646 #endif 1647 1648 if (!getenv("PREINIT")) 1649 return -1; 1650 1651 if (argc != 2) { 1652 ULOG_ERR("Usage: block extroot\n"); 1653 return -1; 1654 } 1655 1656 make_devs(); 1657 cache_load(1); 1658 1659 /* enable LOG_INFO messages */ 1660 ulog_threshold(LOG_INFO); 1661 1662 /* try the currently mounted overlay if exists */ 1663 err = mount_extroot("/tmp/overlay"); 1664 if (!err) 1665 return err; 1666 1667 /* 1668 * Look for "rootfs_data". We will want to mount it and check for 1669 * extroot configuration. 1670 */ 1671 1672 /* Start with looking for MTD partition */ 1673 find_block_mtd("\"rootfs_data\"", blkdev_path, sizeof(blkdev_path)); 1674 if (blkdev_path[0]) { 1675 pr = find_block_info(NULL, NULL, blkdev_path); 1676 if (pr && !strcmp(pr->type, "jffs2")) { 1677 char cfg[] = "/tmp/jffs_cfg"; 1678 1679 /* 1680 * Mount MTD part and try extroot (using 1681 * /etc/config/fstab from that partition) 1682 */ 1683 mkdir_p(cfg, 0755); 1684 if (!mount(blkdev_path, cfg, "jffs2", MS_NOATIME, NULL)) { 1685 err = mount_extroot(cfg); 1686 umount2(cfg, MNT_DETACH); 1687 } 1688 if (err < 0) 1689 rmdir("/tmp/overlay"); 1690 rmdir(cfg); 1691 return err; 1692 } 1693 } 1694 1695 #ifdef UBIFS_EXTROOT 1696 /* ... but it also could be an UBI volume */ 1697 memset(blkdev_path, 0, sizeof(blkdev_path)); 1698 libubi = libubi_open(); 1699 find_block_ubi(libubi, "rootfs_data", blkdev_path, sizeof(blkdev_path)); 1700 libubi_close(libubi); 1701 if (blkdev_path[0]) { 1702 char cfg[] = "/tmp/ubifs_cfg"; 1703 1704 /* Mount volume and try extroot (using fstab from that vol) */ 1705 mkdir_p(cfg, 0755); 1706 if (!mount(blkdev_path, cfg, "ubifs", MS_NOATIME, NULL)) { 1707 err = mount_extroot(cfg); 1708 umount2(cfg, MNT_DETACH); 1709 } 1710 if (err < 0) 1711 rmdir("/tmp/overlay"); 1712 rmdir(cfg); 1713 return err; 1714 } 1715 #endif 1716 1717 /* As a last resort look for /etc/config/fstab on "rootfs" partition */ 1718 return mount_extroot(NULL); 1719 } 1720 1721 static int main_mount(int argc, char **argv) 1722 { 1723 struct probe_info *pr; 1724 1725 if (config_load(NULL)) 1726 return -1; 1727 1728 cache_load(1); 1729 list_for_each_entry(pr, &devices, list) 1730 mount_device(pr, TYPE_DEV); 1731 1732 handle_swapfiles(true); 1733 1734 return 0; 1735 } 1736 1737 static int main_umount(int argc, char **argv) 1738 { 1739 struct probe_info *pr; 1740 bool all = false; 1741 1742 if (config_load(NULL)) 1743 return -1; 1744 1745 handle_swapfiles(false); 1746 1747 cache_load(1); 1748 1749 if (argc == 3) 1750 all = !strcmp(argv[2], "-a"); 1751 1752 list_for_each_entry(pr, &devices, list) { 1753 struct mount *m; 1754 1755 if (!strcmp(pr->type, "swap")) 1756 continue; 1757 1758 m = find_block(pr->uuid, pr->label, basename(pr->dev), NULL); 1759 if (m && m->extroot) 1760 continue; 1761 1762 umount_device(pr->dev, TYPE_DEV, all); 1763 } 1764 1765 return 0; 1766 } 1767 1768 static int main_detect(int argc, char **argv) 1769 { 1770 struct probe_info *pr; 1771 1772 cache_load(0); 1773 printf("config 'global'\n"); 1774 printf("\toption\tanon_swap\t''\n"); 1775 printf("\toption\tanon_mount\t''\n"); 1776 printf("\toption\tauto_swap\t'1'\n"); 1777 printf("\toption\tauto_mount\t'1'\n"); 1778 printf("\toption\tdelay_root\t'5'\n"); 1779 printf("\toption\tcheck_fs\t''\n\n"); 1780 list_for_each_entry(pr, &devices, list) 1781 print_block_uci(pr); 1782 1783 return 0; 1784 } 1785 1786 static int main_info(int argc, char **argv) 1787 { 1788 int i; 1789 struct probe_info *pr; 1790 1791 cache_load(1); 1792 if (argc == 2) { 1793 list_for_each_entry(pr, &devices, list) 1794 print_block_info(pr); 1795 1796 return 0; 1797 }; 1798 1799 for (i = 2; i < argc; i++) { 1800 struct stat s; 1801 1802 if (stat(argv[i], &s)) { 1803 ULOG_ERR("failed to stat %s\n", argv[i]); 1804 continue; 1805 } 1806 if (!S_ISBLK(s.st_mode) && !(S_ISCHR(s.st_mode) && major(s.st_rdev) == 250)) { 1807 ULOG_ERR("%s is not a block device\n", argv[i]); 1808 continue; 1809 } 1810 pr = find_block_info(NULL, NULL, argv[i]); 1811 if (pr) 1812 print_block_info(pr); 1813 } 1814 1815 return 0; 1816 } 1817 1818 static int swapon_usage(void) 1819 { 1820 fprintf(stderr, "Usage: swapon [-s] [-a] [[-p pri] DEVICE]\n\n" 1821 "\tStart swapping on [DEVICE]\n" 1822 " -a\tStart swapping on all swap devices\n" 1823 " -p pri\tSet priority of swap device\n" 1824 " -s\tShow summary\n"); 1825 return -1; 1826 } 1827 1828 static int main_swapon(int argc, char **argv) 1829 { 1830 int ch; 1831 FILE *fp; 1832 char *lineptr; 1833 size_t s; 1834 struct probe_info *pr; 1835 int flags = 0; 1836 int pri; 1837 struct stat st; 1838 int err; 1839 1840 while ((ch = getopt(argc, argv, "ap:s")) != -1) { 1841 switch(ch) { 1842 case 's': 1843 fp = fopen("/proc/swaps", "r"); 1844 lineptr = NULL; 1845 1846 if (!fp) { 1847 ULOG_ERR("failed to open /proc/swaps\n"); 1848 return -1; 1849 } 1850 while (getline(&lineptr, &s, fp) > 0) 1851 printf("%s", lineptr); 1852 if (lineptr) 1853 free(lineptr); 1854 fclose(fp); 1855 return 0; 1856 case 'a': 1857 cache_load(0); 1858 list_for_each_entry(pr, &devices, list) { 1859 if (strcmp(pr->type, "swap")) 1860 continue; 1861 if (swapon(pr->dev, 0)) 1862 ULOG_ERR("failed to swapon %s\n", pr->dev); 1863 } 1864 return 0; 1865 case 'p': 1866 pri = atoi(optarg); 1867 if (pri >= 0) 1868 flags = ((pri << SWAP_FLAG_PRIO_SHIFT) & SWAP_FLAG_PRIO_MASK) | SWAP_FLAG_PREFER; 1869 break; 1870 default: 1871 return swapon_usage(); 1872 } 1873 } 1874 1875 if (optind != (argc - 1)) 1876 return swapon_usage(); 1877 1878 if (stat(argv[optind], &st) || (!S_ISBLK(st.st_mode) && !S_ISREG(st.st_mode))) { 1879 ULOG_ERR("%s is not a block device or file\n", argv[optind]); 1880 return -1; 1881 } 1882 err = swapon(argv[optind], flags); 1883 if (err) { 1884 ULOG_ERR("failed to swapon %s (%d)\n", argv[optind], err); 1885 return err; 1886 } 1887 1888 return 0; 1889 } 1890 1891 static int main_swapoff(int argc, char **argv) 1892 { 1893 if (argc != 2) { 1894 ULOG_ERR("Usage: swapoff [-a] [DEVICE]\n\n" 1895 "\tStop swapping on DEVICE\n" 1896 " -a\tStop swapping on all swap devices\n"); 1897 return -1; 1898 } 1899 1900 if (!strcmp(argv[1], "-a")) { 1901 FILE *fp = fopen("/proc/swaps", "r"); 1902 char line[256]; 1903 1904 if (!fp) { 1905 ULOG_ERR("failed to open /proc/swaps\n"); 1906 return -1; 1907 } 1908 if (fgets(line, sizeof(line), fp)) 1909 while (fgets(line, sizeof(line), fp)) { 1910 char *end = strchr(line, ' '); 1911 int err; 1912 1913 if (!end) 1914 continue; 1915 *end = '\0'; 1916 err = swapoff(line); 1917 if (err) 1918 ULOG_ERR("failed to swapoff %s (%d)\n", line, err); 1919 } 1920 fclose(fp); 1921 } else { 1922 struct stat s; 1923 int err; 1924 1925 if (stat(argv[1], &s) || (!S_ISBLK(s.st_mode) && !S_ISREG(s.st_mode))) { 1926 ULOG_ERR("%s is not a block device or file\n", argv[1]); 1927 return -1; 1928 } 1929 err = swapoff(argv[1]); 1930 if (err) { 1931 ULOG_ERR("failed to swapoff %s (%d)\n", argv[1], err); 1932 return err; 1933 } 1934 } 1935 1936 return 0; 1937 } 1938 1939 int main(int argc, char **argv) 1940 { 1941 char *base = basename(*argv); 1942 1943 umask(0); 1944 1945 ulog_open(-1, -1, "block"); 1946 ulog_threshold(LOG_NOTICE); 1947 1948 if (!strcmp(base, "swapon")) 1949 return main_swapon(argc, argv); 1950 1951 if (!strcmp(base, "swapoff")) 1952 return main_swapoff(argc, argv); 1953 1954 if ((argc > 1) && !strcmp(base, "block")) { 1955 if (!strcmp(argv[1], "info")) 1956 return main_info(argc, argv); 1957 1958 if (!strcmp(argv[1], "detect")) 1959 return main_detect(argc, argv); 1960 1961 if (!strcmp(argv[1], "hotplug")) 1962 return main_hotplug(argc, argv); 1963 1964 if (!strcmp(argv[1], "autofs")) 1965 return main_autofs(argc, argv); 1966 1967 if (!strcmp(argv[1], "extroot")) 1968 return main_extroot(argc, argv); 1969 1970 if (!strcmp(argv[1], "mount")) 1971 return main_mount(argc, argv); 1972 1973 if (!strcmp(argv[1], "umount")) 1974 return main_umount(argc, argv); 1975 1976 if (!strcmp(argv[1], "remount")) { 1977 int ret = main_umount(argc, argv); 1978 1979 if (!ret) 1980 ret = main_mount(argc, argv); 1981 return ret; 1982 } 1983 } 1984 1985 ULOG_ERR("Usage: block <info|mount|umount|detect>\n"); 1986 1987 return -1; 1988 } 1989
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