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 <linux/fs.h> 37 38 #include <uci.h> 39 #include <uci_blob.h> 40 41 #include <libubox/ulog.h> 42 #include <libubox/list.h> 43 #include <libubox/vlist.h> 44 #include <libubox/blobmsg_json.h> 45 #include <libubox/avl-cmp.h> 46 #include <libubus.h> 47 48 #include "probe.h" 49 50 #define AUTOFS_MOUNT_PATH "/tmp/run/blockd/" 51 52 #ifdef UBIFS_EXTROOT 53 #include "libubi/libubi.h" 54 #endif 55 56 enum { 57 TYPE_MOUNT, 58 TYPE_SWAP, 59 }; 60 61 enum { 62 TYPE_DEV, 63 TYPE_HOTPLUG, 64 TYPE_AUTOFS, 65 }; 66 67 struct mount { 68 struct vlist_node node; 69 int type; 70 71 char *target; 72 char *path; 73 char *options; 74 uint32_t flags; 75 char *uuid; 76 char *label; 77 char *device; 78 int extroot; 79 int autofs; 80 int overlay; 81 int disabled_fsck; 82 unsigned int prio; 83 }; 84 85 struct device { 86 struct vlist_node node; 87 88 struct probe_info *pr; 89 struct mount *m; 90 }; 91 92 static void vlist_nop_update(struct vlist_tree *tree, struct vlist_node *node_new, 93 struct vlist_node *node_old); 94 static int devices_cmp(const void *k1, const void *k2, void *ptr); 95 96 static struct blob_buf b; 97 static VLIST_TREE(mounts, avl_strcmp, vlist_nop_update, false, false); 98 static VLIST_TREE(devices, devices_cmp, vlist_nop_update, false, false); 99 static int anon_mount, anon_swap, auto_mount, auto_swap, check_fs; 100 static unsigned int delay_root; 101 102 enum { 103 CFG_ANON_MOUNT, 104 CFG_ANON_SWAP, 105 CFG_AUTO_MOUNT, 106 CFG_AUTO_SWAP, 107 CFG_DELAY_ROOT, 108 CFG_CHECK_FS, 109 __CFG_MAX 110 }; 111 112 static const struct blobmsg_policy config_policy[__CFG_MAX] = { 113 [CFG_ANON_SWAP] = { .name = "anon_swap", .type = BLOBMSG_TYPE_INT32 }, 114 [CFG_ANON_MOUNT] = { .name = "anon_mount", .type = BLOBMSG_TYPE_INT32 }, 115 [CFG_AUTO_SWAP] = { .name = "auto_swap", .type = BLOBMSG_TYPE_INT32 }, 116 [CFG_AUTO_MOUNT] = { .name = "auto_mount", .type = BLOBMSG_TYPE_INT32 }, 117 [CFG_DELAY_ROOT] = { .name = "delay_root", .type = BLOBMSG_TYPE_INT32 }, 118 [CFG_CHECK_FS] = { .name = "check_fs", .type = BLOBMSG_TYPE_INT32 }, 119 }; 120 121 enum { 122 MOUNT_UUID, 123 MOUNT_LABEL, 124 MOUNT_ENABLE, 125 MOUNT_TARGET, 126 MOUNT_DEVICE, 127 MOUNT_OPTIONS, 128 MOUNT_AUTOFS, 129 __MOUNT_MAX 130 }; 131 132 static const struct uci_blob_param_list config_attr_list = { 133 .n_params = __CFG_MAX, 134 .params = config_policy, 135 }; 136 137 static const struct blobmsg_policy mount_policy[__MOUNT_MAX] = { 138 [MOUNT_UUID] = { .name = "uuid", .type = BLOBMSG_TYPE_STRING }, 139 [MOUNT_LABEL] = { .name = "label", .type = BLOBMSG_TYPE_STRING }, 140 [MOUNT_DEVICE] = { .name = "device", .type = BLOBMSG_TYPE_STRING }, 141 [MOUNT_TARGET] = { .name = "target", .type = BLOBMSG_TYPE_STRING }, 142 [MOUNT_OPTIONS] = { .name = "options", .type = BLOBMSG_TYPE_STRING }, 143 [MOUNT_ENABLE] = { .name = "enabled", .type = BLOBMSG_TYPE_INT32 }, 144 [MOUNT_AUTOFS] = { .name = "autofs", .type = BLOBMSG_TYPE_INT32 }, 145 }; 146 147 static const struct uci_blob_param_list mount_attr_list = { 148 .n_params = __MOUNT_MAX, 149 .params = mount_policy, 150 }; 151 152 enum { 153 SWAP_ENABLE, 154 SWAP_UUID, 155 SWAP_LABEL, 156 SWAP_DEVICE, 157 SWAP_PRIO, 158 __SWAP_MAX 159 }; 160 161 static const struct blobmsg_policy swap_policy[__SWAP_MAX] = { 162 [SWAP_ENABLE] = { .name = "enabled", .type = BLOBMSG_TYPE_INT32 }, 163 [SWAP_UUID] = { .name = "uuid", .type = BLOBMSG_TYPE_STRING }, 164 [SWAP_LABEL] = { .name = "label", .type = BLOBMSG_TYPE_STRING }, 165 [SWAP_DEVICE] = { .name = "device", .type = BLOBMSG_TYPE_STRING }, 166 [SWAP_PRIO] = { .name = "priority", .type = BLOBMSG_TYPE_INT32 }, 167 }; 168 169 static const struct uci_blob_param_list swap_attr_list = { 170 .n_params = __SWAP_MAX, 171 .params = swap_policy, 172 }; 173 174 struct mount_flag { 175 const char *name; 176 int32_t flag; 177 }; 178 179 static const struct mount_flag mount_flags[] = { 180 { "sync", MS_SYNCHRONOUS }, 181 { "async", ~MS_SYNCHRONOUS }, 182 { "dirsync", MS_DIRSYNC }, 183 { "mand", MS_MANDLOCK }, 184 { "nomand", ~MS_MANDLOCK }, 185 { "atime", ~MS_NOATIME }, 186 { "noatime", MS_NOATIME }, 187 { "dev", ~MS_NODEV }, 188 { "nodev", MS_NODEV }, 189 { "diratime", ~MS_NODIRATIME }, 190 { "nodiratime", MS_NODIRATIME }, 191 { "exec", ~MS_NOEXEC }, 192 { "noexec", MS_NOEXEC }, 193 { "suid", ~MS_NOSUID }, 194 { "nosuid", MS_NOSUID }, 195 { "rw", ~MS_RDONLY }, 196 { "ro", MS_RDONLY }, 197 { "relatime", MS_RELATIME }, 198 { "norelatime", ~MS_RELATIME }, 199 { "strictatime", MS_STRICTATIME }, 200 { "acl", MS_POSIXACL }, 201 { "noacl", ~MS_POSIXACL }, 202 { "nouser_xattr", MS_NOUSER }, 203 { "user_xattr", ~MS_NOUSER }, 204 }; 205 206 static char *blobmsg_get_strdup(struct blob_attr *attr) 207 { 208 if (!attr) 209 return NULL; 210 211 return strdup(blobmsg_get_string(attr)); 212 } 213 214 static char *blobmsg_get_basename(struct blob_attr *attr) 215 { 216 if (!attr) 217 return NULL; 218 219 return strdup(basename(blobmsg_get_string(attr))); 220 } 221 222 static void parse_mount_options(struct mount *m, char *optstr) 223 { 224 int i; 225 bool is_flag; 226 char *p, *opts, *last; 227 228 m->flags = 0; 229 m->options = NULL; 230 231 if (!optstr || !*optstr) 232 return; 233 234 m->options = opts = calloc(1, strlen(optstr) + 1); 235 236 if (!m->options) 237 return; 238 239 p = last = optstr; 240 241 do { 242 p = strchr(p, ','); 243 244 if (p) 245 *p++ = 0; 246 247 for (i = 0, is_flag = false; i < ARRAY_SIZE(mount_flags); i++) { 248 if (!strcmp(last, mount_flags[i].name)) { 249 if (mount_flags[i].flag < 0) 250 m->flags &= (uint32_t)mount_flags[i].flag; 251 else 252 m->flags |= (uint32_t)mount_flags[i].flag; 253 is_flag = true; 254 break; 255 } 256 } 257 258 if (!is_flag) 259 opts += sprintf(opts, "%s%s", (opts > m->options) ? "," : "", last); 260 261 last = p; 262 263 } while (p); 264 265 free(optstr); 266 } 267 268 static int mount_add(struct uci_section *s) 269 { 270 struct blob_attr *tb[__MOUNT_MAX] = { 0 }; 271 struct mount *m; 272 273 blob_buf_init(&b, 0); 274 uci_to_blob(&b, s, &mount_attr_list); 275 blobmsg_parse(mount_policy, __MOUNT_MAX, tb, blob_data(b.head), blob_len(b.head)); 276 277 if (!tb[MOUNT_LABEL] && !tb[MOUNT_UUID] && !tb[MOUNT_DEVICE]) 278 return -1; 279 280 if (tb[MOUNT_ENABLE] && !blobmsg_get_u32(tb[MOUNT_ENABLE])) 281 return -1; 282 283 m = malloc(sizeof(struct mount)); 284 m->type = TYPE_MOUNT; 285 m->uuid = blobmsg_get_strdup(tb[MOUNT_UUID]); 286 m->label = blobmsg_get_strdup(tb[MOUNT_LABEL]); 287 m->target = blobmsg_get_strdup(tb[MOUNT_TARGET]); 288 m->device = blobmsg_get_basename(tb[MOUNT_DEVICE]); 289 if (tb[MOUNT_AUTOFS]) 290 m->autofs = blobmsg_get_u32(tb[MOUNT_AUTOFS]); 291 else 292 m->autofs = 0; 293 parse_mount_options(m, blobmsg_get_strdup(tb[MOUNT_OPTIONS])); 294 295 m->overlay = m->extroot = 0; 296 if (m->target && !strcmp(m->target, "/")) 297 m->extroot = 1; 298 if (m->target && !strcmp(m->target, "/overlay")) 299 m->extroot = m->overlay = 1; 300 301 if (m->target && *m->target != '/') { 302 ULOG_WARN("ignoring mount section %s due to invalid target '%s'\n", 303 s->e.name, m->target); 304 free(m); 305 return -1; 306 } 307 308 if (m->uuid) 309 vlist_add(&mounts, &m->node, m->uuid); 310 else if (m->label) 311 vlist_add(&mounts, &m->node, m->label); 312 else if (m->device) 313 vlist_add(&mounts, &m->node, m->device); 314 315 return 0; 316 } 317 318 static int swap_add(struct uci_section *s) 319 { 320 struct blob_attr *tb[__SWAP_MAX] = { 0 }; 321 struct mount *m; 322 323 blob_buf_init(&b, 0); 324 uci_to_blob(&b, s, &swap_attr_list); 325 blobmsg_parse(swap_policy, __SWAP_MAX, tb, blob_data(b.head), blob_len(b.head)); 326 327 if (!tb[SWAP_UUID] && !tb[SWAP_LABEL] && !tb[SWAP_DEVICE]) 328 return -1; 329 330 m = malloc(sizeof(struct mount)); 331 memset(m, 0, sizeof(struct mount)); 332 m->type = TYPE_SWAP; 333 m->uuid = blobmsg_get_strdup(tb[SWAP_UUID]); 334 m->label = blobmsg_get_strdup(tb[SWAP_LABEL]); 335 m->device = blobmsg_get_basename(tb[SWAP_DEVICE]); 336 if (tb[SWAP_PRIO]) 337 m->prio = blobmsg_get_u32(tb[SWAP_PRIO]); 338 if (m->prio) 339 m->prio = ((m->prio << SWAP_FLAG_PRIO_SHIFT) & SWAP_FLAG_PRIO_MASK) | SWAP_FLAG_PREFER; 340 341 if ((!tb[SWAP_ENABLE]) || blobmsg_get_u32(tb[SWAP_ENABLE])) { 342 /* store complete swap path */ 343 if (tb[SWAP_DEVICE]) 344 m->target = blobmsg_get_strdup(tb[SWAP_DEVICE]); 345 346 if (m->uuid) 347 vlist_add(&mounts, &m->node, m->uuid); 348 else if (m->label) 349 vlist_add(&mounts, &m->node, m->label); 350 else if (m->device) 351 vlist_add(&mounts, &m->node, m->device); 352 } 353 354 return 0; 355 } 356 357 static int global_add(struct uci_section *s) 358 { 359 struct blob_attr *tb[__CFG_MAX] = { 0 }; 360 361 blob_buf_init(&b, 0); 362 uci_to_blob(&b, s, &config_attr_list); 363 blobmsg_parse(config_policy, __CFG_MAX, tb, blob_data(b.head), blob_len(b.head)); 364 365 if ((tb[CFG_ANON_MOUNT]) && blobmsg_get_u32(tb[CFG_ANON_MOUNT])) 366 anon_mount = 1; 367 if ((tb[CFG_ANON_SWAP]) && blobmsg_get_u32(tb[CFG_ANON_SWAP])) 368 anon_swap = 1; 369 370 if ((tb[CFG_AUTO_MOUNT]) && blobmsg_get_u32(tb[CFG_AUTO_MOUNT])) 371 auto_mount = 1; 372 if ((tb[CFG_AUTO_SWAP]) && blobmsg_get_u32(tb[CFG_AUTO_SWAP])) 373 auto_swap = 1; 374 375 if (tb[CFG_DELAY_ROOT]) 376 delay_root = blobmsg_get_u32(tb[CFG_DELAY_ROOT]); 377 378 if ((tb[CFG_CHECK_FS]) && blobmsg_get_u32(tb[CFG_CHECK_FS])) 379 check_fs = 1; 380 381 return 0; 382 } 383 384 static struct mount* find_swap(const char *uuid, const char *label, const char *device) 385 { 386 struct mount *m; 387 388 vlist_for_each_element(&mounts, m, node) { 389 if (m->type != TYPE_SWAP) 390 continue; 391 if (uuid && m->uuid && !strcasecmp(m->uuid, uuid)) 392 return m; 393 if (label && m->label && !strcmp(m->label, label)) 394 return m; 395 if (device && m->device && !strcmp(m->device, device)) 396 return m; 397 } 398 399 return NULL; 400 } 401 402 static struct mount* find_block(const char *uuid, const char *label, const char *device, 403 const char *target) 404 { 405 struct mount *m; 406 407 vlist_for_each_element(&mounts, m, node) { 408 if (m->type != TYPE_MOUNT) 409 continue; 410 if (m->uuid && uuid && !strcasecmp(m->uuid, uuid)) 411 return m; 412 if (m->label && label && !strcmp(m->label, label)) 413 return m; 414 if (m->target && target && !strcmp(m->target, target)) 415 return m; 416 if (m->device && device && !strcmp(m->device, device)) 417 return m; 418 } 419 420 return NULL; 421 } 422 423 static void vlist_nop_update(struct vlist_tree *tree, struct vlist_node *node_new, 424 struct vlist_node *node_old) 425 { 426 // NOTE: free on delete skipped 427 } 428 429 static struct uci_package * config_try_load(struct uci_context *ctx, char *path) 430 { 431 char *file = basename(path); 432 char *dir = dirname(path); 433 char *err; 434 struct uci_package *pkg; 435 436 uci_set_confdir(ctx, dir); 437 ULOG_INFO("attempting to load %s/%s\n", dir, file); 438 439 if (uci_load(ctx, file, &pkg)) { 440 uci_get_errorstr(ctx, &err, file); 441 ULOG_ERR("unable to load configuration (%s)\n", err); 442 443 free(err); 444 return NULL; 445 } 446 447 return pkg; 448 } 449 450 static int config_load(char *cfg) 451 { 452 struct uci_context *ctx = uci_alloc_context(); 453 struct uci_package *pkg = NULL; 454 struct uci_element *e; 455 char path[64]; 456 457 if (cfg) { 458 snprintf(path, sizeof(path), "%s/upper/etc/config/fstab", cfg); 459 pkg = config_try_load(ctx, path); 460 461 if (!pkg) { 462 snprintf(path, sizeof(path), "%s/etc/config/fstab", cfg); 463 pkg = config_try_load(ctx, path); 464 } 465 } 466 467 if (!pkg) { 468 snprintf(path, sizeof(path), "/etc/config/fstab"); 469 pkg = config_try_load(ctx, path); 470 } 471 472 if (!pkg) { 473 ULOG_ERR("no usable configuration\n"); 474 return -1; 475 } 476 477 vlist_update(&mounts); 478 uci_foreach_element(&pkg->sections, e) { 479 struct uci_section *s = uci_to_section(e); 480 481 if (!strcmp(s->type, "mount")) 482 mount_add(s); 483 if (!strcmp(s->type, "swap")) 484 swap_add(s); 485 if (!strcmp(s->type, "global")) 486 global_add(s); 487 } 488 vlist_flush(&mounts); 489 490 return 0; 491 } 492 493 static struct probe_info* _probe_path(char *path) 494 { 495 struct device *dev; 496 char tmppath[64]; 497 498 /* skip ubi device if ubiblock device is present */ 499 if (path[5] == 'u' && path[6] == 'b' && path[7] == 'i' && 500 path[8] >= '' && path[8] <= '9' ) { 501 snprintf(tmppath, sizeof(tmppath), "/dev/ubiblock%s", path + 8); 502 vlist_for_each_element(&devices, dev, node) 503 if (!strcasecmp(dev->pr->dev, tmppath)) 504 return NULL; 505 } 506 507 return probe_path(path); 508 } 509 510 static int _cache_load(const char *path) 511 { 512 int gl_flags = GLOB_NOESCAPE | GLOB_MARK; 513 int j; 514 glob_t gl; 515 struct device *dev; 516 517 if (glob(path, gl_flags, NULL, &gl) < 0) 518 return -1; 519 520 for (j = 0; j < gl.gl_pathc; j++) { 521 struct probe_info *pr = _probe_path(gl.gl_pathv[j]); 522 if (pr) { 523 dev = malloc(sizeof(struct device)); 524 dev->pr = pr; 525 dev->m = find_block(pr->uuid, pr->label, 526 basename(pr->dev), NULL); 527 vlist_add(&devices, &dev->node, dev); 528 } 529 } 530 531 globfree(&gl); 532 533 return 0; 534 } 535 536 static int devices_cmp(const void *k1, const void *k2, void *ptr) 537 { 538 struct device *dev1 = (struct device *)k1; 539 struct device *dev2 = (struct device *)k2; 540 541 if (dev1->m) { 542 if (!dev2->m) 543 return -1; 544 if (dev1->m->type == TYPE_MOUNT && dev2->m->type == TYPE_MOUNT && 545 dev1->m->target && dev2->m->target) { 546 int len1 = strlen(dev1->m->target); 547 int len2 = strlen(dev2->m->target); 548 if (len1 != len2) 549 return len1 - len2; 550 } 551 } else if (dev2->m) { 552 return 1; 553 } 554 return strcmp(dev1->pr->dev, dev2->pr->dev); 555 } 556 557 static void cache_load(int mtd) 558 { 559 vlist_update(&devices); 560 if (mtd) { 561 _cache_load("/dev/mtdblock*"); 562 _cache_load("/dev/ubiblock*"); 563 _cache_load("/dev/ubi[0-9]*"); 564 } 565 _cache_load("/dev/loop*"); 566 _cache_load("/dev/mmcblk*"); 567 _cache_load("/dev/sd*"); 568 _cache_load("/dev/hd*"); 569 _cache_load("/dev/md*"); 570 _cache_load("/dev/nvme*"); 571 _cache_load("/dev/vd*"); 572 _cache_load("/dev/xvd*"); 573 _cache_load("/dev/mapper/*"); 574 vlist_flush(&devices); 575 } 576 577 578 static struct device* find_block_device(char *uuid, char *label, char *path) 579 { 580 struct device *dev; 581 582 if (uuid) 583 vlist_for_each_element(&devices, dev, node) 584 if (dev->pr->uuid && !strcasecmp(dev->pr->uuid, uuid)) 585 return dev; 586 587 if (label) 588 vlist_for_each_element(&devices, dev, node) 589 if (dev->pr->label && !strcmp(dev->pr->label, label)) 590 return dev; 591 592 if (path) 593 vlist_for_each_element(&devices, dev, node) 594 if (dev->pr->dev && !strcmp(basename(dev->pr->dev), basename(path))) 595 return dev; 596 597 return NULL; 598 } 599 600 static char* find_mount_point(char *block) 601 { 602 FILE *fp = fopen("/proc/self/mountinfo", "r"); 603 static char line[256]; 604 char *point = NULL, *pos, *tmp, *cpoint, *devname; 605 struct stat s; 606 int rstat; 607 unsigned int minor, major; 608 609 if (!fp) 610 return NULL; 611 612 rstat = stat(block, &s); 613 614 while (fgets(line, sizeof(line), fp)) { 615 pos = strchr(line, ' '); 616 if (!pos) 617 continue; 618 619 pos = strchr(pos + 1, ' '); 620 if (!pos) 621 continue; 622 623 tmp = ++pos; 624 pos = strchr(pos, ':'); 625 if (!pos) 626 continue; 627 628 *pos = '\0'; 629 major = atoi(tmp); 630 tmp = ++pos; 631 pos = strchr(pos, ' '); 632 if (!pos) 633 continue; 634 635 *pos = '\0'; 636 minor = atoi(tmp); 637 pos = strchr(pos + 1, ' '); 638 if (!pos) 639 continue; 640 tmp = ++pos; 641 642 pos = strchr(pos, ' '); 643 if (!pos) 644 continue; 645 *pos = '\0'; 646 cpoint = tmp; 647 648 pos = strchr(pos + 1, ' '); 649 if (!pos) 650 continue; 651 652 pos = strchr(pos + 1, ' '); 653 if (!pos) 654 continue; 655 656 pos = strchr(pos + 1, ' '); 657 if (!pos) 658 continue; 659 660 tmp = ++pos; 661 pos = strchr(pos, ' '); 662 if (!pos) 663 continue; 664 665 *pos = '\0'; 666 devname = tmp; 667 if (!strcmp(block, devname)) { 668 point = strdup(cpoint); 669 break; 670 } 671 672 if (rstat) 673 continue; 674 675 if (!S_ISBLK(s.st_mode)) 676 continue; 677 678 if (major == major(s.st_rdev) && 679 minor == minor(s.st_rdev)) { 680 point = strdup(cpoint); 681 break; 682 } 683 } 684 685 fclose(fp); 686 687 return point; 688 } 689 690 static int print_block_uci(struct probe_info *pr) 691 { 692 if (!strcmp(pr->type, "swap")) { 693 printf("config 'swap'\n"); 694 } else { 695 char *mp = find_mount_point(pr->dev); 696 697 printf("config 'mount'\n"); 698 if (mp) { 699 printf("\toption\ttarget\t'%s'\n", mp); 700 free(mp); 701 } else { 702 printf("\toption\ttarget\t'/mnt/%s'\n", basename(pr->dev)); 703 } 704 } 705 if (pr->uuid) 706 printf("\toption\tuuid\t'%s'\n", pr->uuid); 707 else 708 printf("\toption\tdevice\t'%s'\n", pr->dev); 709 printf("\toption\tenabled\t''\n\n"); 710 711 return 0; 712 } 713 714 static int print_block_info(struct probe_info *pr) 715 { 716 static char *mp; 717 718 mp = find_mount_point(pr->dev); 719 printf("%s:", pr->dev); 720 if (pr->uuid) 721 printf(" UUID=\"%s\"", pr->uuid); 722 723 if (pr->label) 724 printf(" LABEL=\"%s\"", pr->label); 725 726 if (pr->version) 727 printf(" VERSION=\"%s\"", pr->version); 728 729 if (mp) { 730 printf(" MOUNT=\"%s\"", mp); 731 free(mp); 732 } 733 734 printf(" TYPE=\"%s\"\n", pr->type); 735 736 return 0; 737 } 738 739 static void mkdir_p(char *dir) 740 { 741 char *l = strrchr(dir, '/'); 742 743 if (l) { 744 *l = '\0'; 745 mkdir_p(dir); 746 *l = '/'; 747 mkdir(dir, 0755); 748 } 749 } 750 751 static void check_filesystem(struct probe_info *pr) 752 { 753 pid_t pid; 754 struct stat statbuf; 755 const char *e2fsck = "/usr/sbin/e2fsck"; 756 const char *f2fsck = "/usr/sbin/fsck.f2fs"; 757 const char *fatfsck = "/usr/sbin/fsck.fat"; 758 const char *btrfsck = "/usr/bin/btrfsck"; 759 const char *ntfsck = "/usr/bin/ntfsfix"; 760 const char *ckfs; 761 762 /* UBIFS does not need stuff like fsck */ 763 if (!strncmp(pr->type, "ubifs", 5)) 764 return; 765 766 if (!strncmp(pr->type, "vfat", 4)) { 767 ckfs = fatfsck; 768 } else if (!strncmp(pr->type, "f2fs", 4)) { 769 ckfs = f2fsck; 770 } else if (!strncmp(pr->type, "ext", 3)) { 771 ckfs = e2fsck; 772 } else if (!strncmp(pr->type, "btrfs", 5)) { 773 ckfs = btrfsck; 774 } else if (!strncmp(pr->type, "ntfs", 4)) { 775 ckfs = ntfsck; 776 } else { 777 ULOG_ERR("check_filesystem: %s is not supported\n", pr->type); 778 return; 779 } 780 781 if (stat(ckfs, &statbuf) < 0) { 782 ULOG_ERR("check_filesystem: %s not found\n", ckfs); 783 return; 784 } 785 786 pid = fork(); 787 if (!pid) { 788 if(!strncmp(pr->type, "f2fs", 4)) { 789 execl(ckfs, ckfs, "-f", pr->dev, NULL); 790 exit(EXIT_FAILURE); 791 } else if(!strncmp(pr->type, "btrfs", 5)) { 792 execl(ckfs, ckfs, "--repair", pr->dev, NULL); 793 exit(EXIT_FAILURE); 794 } else if(!strncmp(pr->type, "ntfs", 4)) { 795 execl(ckfs, ckfs, "-b", pr->dev, NULL); 796 exit(EXIT_FAILURE); 797 } else { 798 execl(ckfs, ckfs, "-p", pr->dev, NULL); 799 exit(EXIT_FAILURE); 800 } 801 } else if (pid > 0) { 802 int status; 803 804 waitpid(pid, &status, 0); 805 if (WIFEXITED(status) && WEXITSTATUS(status)) 806 ULOG_ERR("check_filesystem: %s returned %d\n", ckfs, WEXITSTATUS(status)); 807 if (WIFSIGNALED(status)) 808 ULOG_ERR("check_filesystem: %s terminated by %s\n", ckfs, strsignal(WTERMSIG(status))); 809 } 810 } 811 812 static void handle_swapfiles(bool on) 813 { 814 struct stat s; 815 struct mount *m; 816 struct probe_info *pr; 817 818 vlist_for_each_element(&mounts, m, node) 819 { 820 if (m->type != TYPE_SWAP || !m->target) 821 continue; 822 823 if (stat(m->target, &s) || !S_ISREG(s.st_mode)) 824 continue; 825 826 pr = _probe_path(m->target); 827 828 if (!pr) 829 continue; 830 831 if (!strcmp(pr->type, "swap")) { 832 if (on) 833 swapon(pr->dev, m->prio); 834 else 835 swapoff(pr->dev); 836 } 837 838 free(pr); 839 } 840 } 841 842 static void to_devnull(int fd) 843 { 844 int devnull = open("/dev/null", fd ? O_WRONLY : O_RDONLY); 845 846 if (devnull >= 0) 847 dup2(devnull, fd); 848 849 if (devnull > STDERR_FILENO) 850 close(devnull); 851 } 852 853 static int exec_mount(const char *source, const char *target, 854 const char *fstype, const char *options) 855 { 856 pid_t pid; 857 struct stat s; 858 FILE *mount_fd; 859 int err, status, pfds[2]; 860 char errmsg[128], cmd[sizeof("/sbin/mount.XXXXXXXXXXXXXXXX\0")]; 861 862 snprintf(cmd, sizeof(cmd), "/sbin/mount.%s", fstype); 863 864 if (stat(cmd, &s) < 0 || !S_ISREG(s.st_mode) || !(s.st_mode & S_IXUSR)) { 865 ULOG_ERR("No \"mount.%s\" utility available\n", fstype); 866 return -1; 867 } 868 869 if (pipe(pfds) < 0) 870 return -1; 871 872 fcntl(pfds[0], F_SETFD, fcntl(pfds[0], F_GETFD) | FD_CLOEXEC); 873 fcntl(pfds[1], F_SETFD, fcntl(pfds[1], F_GETFD) | FD_CLOEXEC); 874 875 pid = vfork(); 876 877 switch (pid) { 878 case -1: 879 close(pfds[0]); 880 close(pfds[1]); 881 882 return -1; 883 884 case 0: 885 to_devnull(STDIN_FILENO); 886 to_devnull(STDOUT_FILENO); 887 888 dup2(pfds[1], STDERR_FILENO); 889 close(pfds[0]); 890 close(pfds[1]); 891 892 if (options && *options) 893 execl(cmd, cmd, "-o", options, source, target, NULL); 894 else 895 execl(cmd, cmd, source, target, NULL); 896 897 return -1; 898 899 default: 900 close(pfds[1]); 901 902 mount_fd = fdopen(pfds[0], "r"); 903 904 while (fgets(errmsg, sizeof(errmsg), mount_fd)) 905 ULOG_ERR("mount.%s: %s", fstype, errmsg); 906 907 fclose(mount_fd); 908 909 err = waitpid(pid, &status, 0); 910 911 if (err != -1) { 912 if (status != 0) { 913 ULOG_ERR("mount.%s: failed with status %d\n", fstype, status); 914 errno = EINVAL; 915 err = -1; 916 } else { 917 errno = 0; 918 err = 0; 919 } 920 } 921 922 break; 923 } 924 925 return err; 926 } 927 928 static int hotplug_call_mount(const char *action, const char *device) 929 { 930 pid_t pid; 931 int err = 0; 932 933 pid = fork(); 934 if (!pid) { 935 char * const argv[] = { "hotplug-call", "mount", NULL }; 936 937 setenv("ACTION", action, 1); 938 setenv("DEVICE", device, 1); 939 940 execv("/sbin/hotplug-call", argv); 941 exit(-1); 942 } else if (pid > 0) { 943 int status; 944 945 pid = waitpid(pid, &status, 0); 946 if (pid <= 0 || !WIFEXITED(status) || WEXITSTATUS(status)) { 947 err = -ENOEXEC; 948 ULOG_ERR("hotplug-call call failed\n"); 949 } 950 } else { 951 err = -errno; 952 } 953 954 return err; 955 } 956 957 static int handle_mount(const char *source, const char *target, 958 const char *fstype, struct mount *m) 959 { 960 int i, err; 961 size_t mount_opts_len; 962 char *mount_opts = NULL, *ptr; 963 964 err = mount(source, target, fstype, m ? m->flags : 0, 965 (m && m->options) ? m->options : ""); 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 err = exec_mount(source, target, fstype, mount_opts); 1003 } 1004 1005 return err; 1006 } 1007 1008 static int blockd_notify(char *device, struct mount *m, struct probe_info *pr) 1009 { 1010 struct ubus_context *ctx = ubus_connect(NULL); 1011 uint32_t id; 1012 int err; 1013 1014 if (!ctx) 1015 return -ENXIO; 1016 1017 if (!ubus_lookup_id(ctx, "block", &id)) { 1018 struct blob_buf buf = { 0 }; 1019 char *d = strrchr(device, '/'); 1020 1021 if (d) 1022 d++; 1023 else 1024 d = device; 1025 1026 blob_buf_init(&buf, 0); 1027 1028 if (m) { 1029 1030 blobmsg_add_string(&buf, "device", d); 1031 if (m->uuid) 1032 blobmsg_add_string(&buf, "uuid", m->uuid); 1033 if (m->label) 1034 blobmsg_add_string(&buf, "label", m->label); 1035 if (m->target) 1036 blobmsg_add_string(&buf, "target", m->target); 1037 if (m->options) 1038 blobmsg_add_string(&buf, "options", m->options); 1039 if (m->autofs) 1040 blobmsg_add_u32(&buf, "autofs", m->autofs); 1041 if (pr->type) 1042 blobmsg_add_string(&buf, "type", pr->type); 1043 if (pr->version) 1044 blobmsg_add_string(&buf, "version", pr->version); 1045 } else if (pr) { 1046 blobmsg_add_string(&buf, "device", d); 1047 if (pr->uuid) 1048 blobmsg_add_string(&buf, "uuid", pr->uuid); 1049 if (pr->label) 1050 blobmsg_add_string(&buf, "label", pr->label); 1051 if (pr->type) 1052 blobmsg_add_string(&buf, "type", pr->type); 1053 if (pr->version) 1054 blobmsg_add_string(&buf, "version", pr->version); 1055 blobmsg_add_u32(&buf, "anon", 1); 1056 } else { 1057 blobmsg_add_string(&buf, "device", d); 1058 blobmsg_add_u32(&buf, "remove", 1); 1059 } 1060 1061 err = ubus_invoke(ctx, id, "hotplug", buf.head, NULL, NULL, 3000); 1062 } else { 1063 err = -ENOENT; 1064 } 1065 1066 ubus_free(ctx); 1067 1068 return err; 1069 } 1070 1071 static int mount_device(struct device *dev, int type) 1072 { 1073 struct mount *m; 1074 struct probe_info *pr; 1075 struct stat st; 1076 char _target[32]; 1077 char *target; 1078 char *device; 1079 char *mp; 1080 int err; 1081 1082 if (!dev) 1083 return -1; 1084 1085 pr = dev->pr; 1086 device = basename(pr->dev); 1087 1088 if (!strcmp(pr->type, "swap")) { 1089 if ((type == TYPE_HOTPLUG) && !auto_swap) 1090 return -1; 1091 m = find_swap(pr->uuid, pr->label, device); 1092 if (m || anon_swap) 1093 swapon(pr->dev, (m) ? (m->prio) : (0)); 1094 1095 return 0; 1096 } 1097 1098 m = dev->m; 1099 if (m && m->extroot) 1100 return -1; 1101 1102 mp = find_mount_point(pr->dev); 1103 if (mp) { 1104 if (m && m->type == TYPE_MOUNT && strcmp(m->target, mp)) { 1105 ULOG_ERR("%s is already mounted on %s\n", pr->dev, mp); 1106 err = -1; 1107 } else 1108 err = 0; 1109 free(mp); 1110 return err; 1111 } 1112 1113 if (type == TYPE_HOTPLUG) 1114 blockd_notify(device, m, pr); 1115 1116 /* Check if device should be mounted & set the target directory */ 1117 if (m) { 1118 switch (type) { 1119 case TYPE_HOTPLUG: 1120 if (m->autofs) 1121 return 0; 1122 if (!auto_mount) 1123 return -1; 1124 break; 1125 case TYPE_AUTOFS: 1126 if (!m->autofs) 1127 return -1; 1128 break; 1129 case TYPE_DEV: 1130 if (m->autofs) 1131 return -1; 1132 break; 1133 } 1134 1135 if (m->autofs) { 1136 snprintf(_target, sizeof(_target), "/tmp/run/blockd/%s", device); 1137 target = _target; 1138 } else if (m->target) { 1139 target = m->target; 1140 } else { 1141 snprintf(_target, sizeof(_target), "/mnt/%s", device); 1142 target = _target; 1143 } 1144 } else if (anon_mount) { 1145 snprintf(_target, sizeof(_target), "/mnt/%s", device); 1146 target = _target; 1147 } else { 1148 /* No reason to mount this device */ 1149 return 0; 1150 } 1151 1152 /* Mount the device */ 1153 1154 if (check_fs) 1155 check_filesystem(pr); 1156 1157 mkdir_p(target); 1158 if (!lstat(target, &st) && S_ISLNK(st.st_mode)) 1159 unlink(target); 1160 1161 err = handle_mount(pr->dev, target, pr->type, m); 1162 if (err) { 1163 ULOG_ERR("mounting %s (%s) as %s failed (%d) - %m\n", 1164 pr->dev, pr->type, target, errno); 1165 return err; 1166 } 1167 1168 handle_swapfiles(true); 1169 1170 if (type != TYPE_AUTOFS) 1171 hotplug_call_mount("add", device); 1172 1173 return 0; 1174 } 1175 1176 static int umount_device(char *path, int type, bool all) 1177 { 1178 char *mp; 1179 int err; 1180 1181 mp = find_mount_point(path); 1182 if (!mp) 1183 return -1; 1184 if (!strcmp(mp, "/") && !all) 1185 return 0; 1186 1187 if (type != TYPE_AUTOFS) 1188 hotplug_call_mount("remove", basename(path)); 1189 1190 err = umount2(mp, MNT_DETACH); 1191 if (err) { 1192 ULOG_ERR("unmounting %s (%s) failed (%d) - %m\n", path, mp, 1193 errno); 1194 } else { 1195 ULOG_INFO("unmounted %s (%s)\n", path, mp); 1196 rmdir(mp); 1197 } 1198 1199 free(mp); 1200 return err; 1201 } 1202 1203 static int mount_action(char *action, char *device, int type) 1204 { 1205 struct device *the_dev, *dev; 1206 char path[32]; 1207 1208 if (!action || !device) 1209 return -1; 1210 1211 if (config_load(NULL)) 1212 return -1; 1213 cache_load(0); 1214 1215 the_dev = find_block_device(NULL, NULL, device); 1216 1217 if (!strcmp(action, "remove")) { 1218 if (type == TYPE_HOTPLUG) 1219 blockd_notify(device, NULL, NULL); 1220 1221 if (!the_dev || !the_dev->m || the_dev->m->type != TYPE_MOUNT) { 1222 snprintf(path, sizeof(path), "/dev/%s", device); 1223 umount_device(path, type, true); 1224 } else 1225 vlist_for_element_to_last_reverse(&devices, the_dev, dev, node) 1226 if (dev->m && dev->m->type == TYPE_MOUNT) 1227 umount_device(dev->pr->dev, type, true); 1228 return 0; 1229 } else if (!strcmp(action, "add")) { 1230 if (!the_dev) 1231 return -1; 1232 if (the_dev->m && the_dev->m->type == TYPE_MOUNT) { 1233 vlist_for_first_to_element(&devices, the_dev, dev, node) { 1234 if (dev->m && dev->m->type == TYPE_MOUNT) { 1235 int err = mount_device(dev, type); 1236 if (err) 1237 return err; 1238 } 1239 } 1240 return 0; 1241 } else 1242 return mount_device(the_dev, type); 1243 } 1244 ULOG_ERR("Unkown action %s\n", action); 1245 return -1; 1246 } 1247 1248 static int main_hotplug(int argc, char **argv) 1249 { 1250 return mount_action(getenv("ACTION"), getenv("DEVNAME"), TYPE_HOTPLUG); 1251 } 1252 1253 static int main_autofs(int argc, char **argv) 1254 { 1255 int err = 0; 1256 1257 if (argc < 3) 1258 return -1; 1259 1260 if (!strcmp(argv[2], "start")) { 1261 struct device *dev; 1262 struct probe_info *pr; 1263 1264 if (config_load(NULL)) 1265 return -1; 1266 1267 cache_load(0); 1268 vlist_for_each_element(&devices, dev, node) { 1269 struct mount *m; 1270 1271 pr = dev->pr; 1272 if (!strcmp(pr->type, "swap")) 1273 continue; 1274 1275 m = dev->m; 1276 if (m && m->extroot) 1277 continue; 1278 1279 blockd_notify(pr->dev, m, pr); 1280 } 1281 } else if (!strcmp(argv[2], "available")) { 1282 err = hotplug_call_mount("add", argv[3]); 1283 } else if (!strcmp(argv[2], "unavailable")) { 1284 err = hotplug_call_mount("remove", argv[3]); 1285 } else { 1286 if (argc < 4) 1287 return -EINVAL; 1288 1289 err = mount_action(argv[2], argv[3], TYPE_AUTOFS); 1290 } 1291 1292 if (err) { 1293 ULOG_ERR("autofs: \"%s\" action has failed: %d\n", argv[2], err); 1294 } 1295 1296 return err; 1297 } 1298 1299 static int find_block_mtd(char *name, char *part, int plen) 1300 { 1301 FILE *fp = fopen("/proc/mtd", "r"); 1302 static char line[256]; 1303 char *index = NULL; 1304 1305 if(!fp) 1306 return -1; 1307 1308 while (!index && fgets(line, sizeof(line), fp)) { 1309 if (strstr(line, name)) { 1310 char *eol = strstr(line, ":"); 1311 1312 if (!eol) 1313 continue; 1314 1315 *eol = '\0'; 1316 index = &line[3]; 1317 } 1318 } 1319 1320 fclose(fp); 1321 1322 if (!index) 1323 return -1; 1324 1325 snprintf(part, plen, "/dev/mtdblock%s", index); 1326 1327 return 0; 1328 } 1329 1330 #ifdef UBIFS_EXTROOT 1331 static int find_ubi_vol(libubi_t libubi, char *name, int *dev_num, int *vol_id) 1332 { 1333 int dev = 0; 1334 1335 while (ubi_dev_present(libubi, dev)) 1336 { 1337 struct ubi_dev_info dev_info; 1338 struct ubi_vol_info vol_info; 1339 1340 if (ubi_get_dev_info1(libubi, dev++, &dev_info)) 1341 continue; 1342 if (ubi_get_vol_info1_nm(libubi, dev_info.dev_num, name, &vol_info)) 1343 continue; 1344 1345 *dev_num = dev_info.dev_num; 1346 *vol_id = vol_info.vol_id; 1347 1348 return 0; 1349 } 1350 1351 return -1; 1352 } 1353 1354 static int find_block_ubi(libubi_t libubi, char *name, char *part, int plen) 1355 { 1356 int dev_num; 1357 int vol_id; 1358 int err = -1; 1359 1360 err = find_ubi_vol(libubi, name, &dev_num, &vol_id); 1361 if (!err) 1362 snprintf(part, plen, "/dev/ubi%d_%d", dev_num, vol_id); 1363 1364 return err; 1365 } 1366 1367 static int find_block_ubi_RO(libubi_t libubi, char *name, char *part, int plen) 1368 { 1369 int dev_num; 1370 int vol_id; 1371 int err = -1; 1372 1373 err = find_ubi_vol(libubi, name, &dev_num, &vol_id); 1374 if (!err) 1375 snprintf(part, plen, "/dev/ubiblock%d_%d", dev_num, vol_id); 1376 1377 return err; 1378 } 1379 1380 #else 1381 1382 static int find_root_dev(char *buf, int len) 1383 { 1384 DIR *d; 1385 dev_t root; 1386 struct stat s; 1387 struct dirent *e; 1388 1389 if (stat("/", &s)) 1390 return -1; 1391 1392 if (!(d = opendir("/dev"))) 1393 return -1; 1394 1395 root = s.st_dev; 1396 1397 while ((e = readdir(d)) != NULL) { 1398 snprintf(buf, len, "/dev/%s", e->d_name); 1399 1400 if (stat(buf, &s) || s.st_rdev != root) 1401 continue; 1402 1403 closedir(d); 1404 return 0; 1405 } 1406 1407 closedir(d); 1408 return -1; 1409 } 1410 1411 #endif 1412 1413 static int test_fs_support(const char *name) 1414 { 1415 char line[128], *p; 1416 int rv = -1; 1417 FILE *f; 1418 1419 if ((f = fopen("/proc/filesystems", "r")) != NULL) { 1420 while (fgets(line, sizeof(line), f)) { 1421 p = strtok(line, "\t\n"); 1422 1423 if (p && !strcmp(p, "nodev")) 1424 p = strtok(NULL, "\t\n"); 1425 1426 if (p && !strcmp(p, name)) { 1427 rv = 0; 1428 break; 1429 } 1430 } 1431 fclose(f); 1432 } 1433 1434 return rv; 1435 } 1436 1437 static int check_extroot(char *path) 1438 { 1439 struct device *dev; 1440 struct probe_info *pr; 1441 char devpath[32]; 1442 1443 #ifdef UBIFS_EXTROOT 1444 if (find_block_mtd("\"rootfs\"", devpath, sizeof(devpath))) { 1445 int err = -1; 1446 libubi_t libubi; 1447 1448 libubi = libubi_open(); 1449 err = find_block_ubi_RO(libubi, "rootfs", devpath, sizeof(devpath)); 1450 libubi_close(libubi); 1451 if (err) 1452 return -1; 1453 } 1454 #else 1455 if (find_block_mtd("\"rootfs\"", devpath, sizeof(devpath))) { 1456 if (find_root_dev(devpath, sizeof(devpath))) { 1457 ULOG_ERR("extroot: unable to determine root device\n"); 1458 return -1; 1459 } 1460 } 1461 #endif 1462 1463 vlist_for_each_element(&devices, dev, node) { 1464 pr = dev->pr; 1465 if (!strcmp(pr->dev, devpath)) { 1466 struct stat s; 1467 FILE *fp = NULL; 1468 char tag[64]; 1469 char uuid[64] = { 0 }; 1470 1471 snprintf(tag, sizeof(tag), "%s/etc", path); 1472 if (stat(tag, &s)) 1473 mkdir_p(tag); 1474 1475 snprintf(tag, sizeof(tag), "%s/etc/.extroot-uuid", path); 1476 if (stat(tag, &s)) { 1477 fp = fopen(tag, "w+"); 1478 if (!fp) { 1479 ULOG_ERR("extroot: failed to write UUID to %s: %d (%m)\n", 1480 tag, errno); 1481 /* return 0 to continue boot regardless of error */ 1482 return 0; 1483 } 1484 fputs(pr->uuid, fp); 1485 fclose(fp); 1486 return 0; 1487 } 1488 1489 fp = fopen(tag, "r"); 1490 if (!fp) { 1491 ULOG_ERR("extroot: failed to read UUID from %s: %d (%m)\n", 1492 tag, errno); 1493 return -1; 1494 } 1495 1496 if (!fgets(uuid, sizeof(uuid), fp)) 1497 ULOG_ERR("extroot: failed to read UUID from %s: %d (%m)\n", 1498 tag, errno); 1499 fclose(fp); 1500 1501 if (*uuid && !strcasecmp(uuid, pr->uuid)) 1502 return 0; 1503 1504 ULOG_ERR("extroot: UUID mismatch (root: %s, %s: %s)\n", 1505 pr->uuid, basename(path), uuid); 1506 return -1; 1507 } 1508 } 1509 1510 ULOG_ERR("extroot: unable to lookup root device %s\n", devpath); 1511 return -1; 1512 } 1513 1514 /* 1515 * Read info about extroot from UCI (using prefix) and mount it. 1516 */ 1517 static int mount_extroot(char *cfg) 1518 { 1519 char overlay[] = "/tmp/extroot/overlay"; 1520 char mnt[] = "/tmp/extroot/mnt"; 1521 char *path = mnt; 1522 struct device *dev; 1523 struct probe_info *pr; 1524 struct mount *m; 1525 int err = -1; 1526 1527 /* Load @cfg/etc/config/fstab */ 1528 if (config_load(cfg)) 1529 return -2; 1530 1531 /* See if there is extroot-specific mount config */ 1532 m = find_block(NULL, NULL, NULL, "/"); 1533 if (!m) 1534 m = find_block(NULL, NULL, NULL, "/overlay"); 1535 1536 if (!m || !m->extroot) 1537 { 1538 ULOG_INFO("extroot: not configured\n"); 1539 return -1; 1540 } 1541 1542 /* Find block device pointed by the mount config */ 1543 dev = find_block_device(m->uuid, m->label, m->device); 1544 1545 if (!dev && delay_root){ 1546 ULOG_INFO("extroot: device not present, retrying in %u seconds\n", delay_root); 1547 sleep(delay_root); 1548 make_devs(); 1549 cache_load(1); 1550 dev = find_block_device(m->uuid, m->label, m->device); 1551 } 1552 if (dev) { 1553 pr = dev->pr; 1554 if (strncmp(pr->type, "ext", 3) && 1555 strncmp(pr->type, "f2fs", 4) && 1556 strncmp(pr->type, "btrfs", 5) && 1557 strncmp(pr->type, "ntfs", 4) && 1558 strncmp(pr->type, "ubifs", 5)) { 1559 ULOG_ERR("extroot: unsupported filesystem %s, try ext4, f2fs, btrfs, ntfs or ubifs\n", pr->type); 1560 return -1; 1561 } 1562 1563 if (test_fs_support(pr->type)) { 1564 ULOG_ERR("extroot: filesystem %s not supported by kernel\n", pr->type); 1565 return -1; 1566 } 1567 1568 if (m->overlay) 1569 path = overlay; 1570 mkdir_p(path); 1571 1572 if (check_fs) 1573 check_filesystem(pr); 1574 1575 err = mount(pr->dev, path, pr->type, m->flags, 1576 (m->options) ? (m->options) : ("")); 1577 1578 if (err) { 1579 ULOG_ERR("extroot: mounting %s (%s) on %s failed: %d (%m)\n", 1580 pr->dev, pr->type, path, errno); 1581 } else if (m->overlay) { 1582 err = check_extroot(path); 1583 if (err) 1584 umount(path); 1585 } 1586 } else { 1587 ULOG_ERR("extroot: cannot find device %s%s\n", 1588 (m->uuid ? "with UUID " : (m->label ? "with label " : "")), 1589 (m->uuid ? m->uuid : (m->label ? m->label : m->device))); 1590 } 1591 1592 return err; 1593 } 1594 1595 static int main_extroot(int argc, char **argv) 1596 { 1597 char blkdev_path[32] = { 0 }; 1598 int err = -1; 1599 #ifdef UBIFS_EXTROOT 1600 libubi_t libubi; 1601 #endif 1602 1603 if (!getenv("PREINIT")) 1604 return -1; 1605 1606 if (argc != 2) { 1607 ULOG_ERR("Usage: block extroot\n"); 1608 return -1; 1609 } 1610 1611 make_devs(); 1612 cache_load(1); 1613 1614 /* enable LOG_INFO messages */ 1615 ulog_threshold(LOG_INFO); 1616 1617 /* 1618 * Look for "rootfs_data". We will want to mount it and check for 1619 * extroot configuration. 1620 */ 1621 1622 /* Start with looking for MTD partition */ 1623 find_block_mtd("\"rootfs_data\"", blkdev_path, sizeof(blkdev_path)); 1624 if (blkdev_path[0]) { 1625 struct device *dev = find_block_device(NULL, NULL, blkdev_path); 1626 if (dev && !strcmp(dev->pr->type, "jffs2")) { 1627 char cfg[] = "/tmp/jffs_cfg"; 1628 1629 /* 1630 * Mount MTD part and try extroot (using 1631 * /etc/config/fstab from that partition) 1632 */ 1633 mkdir_p(cfg); 1634 if (!mount(blkdev_path, cfg, "jffs2", MS_NOATIME, NULL)) { 1635 err = mount_extroot(cfg); 1636 umount2(cfg, MNT_DETACH); 1637 } 1638 if (err < 0) 1639 rmdir("/tmp/overlay"); 1640 rmdir(cfg); 1641 return err; 1642 } 1643 } 1644 1645 #ifdef UBIFS_EXTROOT 1646 /* ... but it also could be an UBI volume */ 1647 memset(blkdev_path, 0, sizeof(blkdev_path)); 1648 libubi = libubi_open(); 1649 find_block_ubi(libubi, "rootfs_data", blkdev_path, sizeof(blkdev_path)); 1650 libubi_close(libubi); 1651 if (blkdev_path[0]) { 1652 char cfg[] = "/tmp/ubifs_cfg"; 1653 1654 /* Mount volume and try extroot (using fstab from that vol) */ 1655 mkdir_p(cfg); 1656 if (!mount(blkdev_path, cfg, "ubifs", MS_NOATIME, NULL)) { 1657 err = mount_extroot(cfg); 1658 umount2(cfg, MNT_DETACH); 1659 } 1660 if (err < 0) 1661 rmdir("/tmp/overlay"); 1662 rmdir(cfg); 1663 return err; 1664 } 1665 #endif 1666 1667 return mount_extroot(NULL); 1668 } 1669 1670 static int main_mount(int argc, char **argv) 1671 { 1672 struct device *dev; 1673 1674 if (config_load(NULL)) 1675 return -1; 1676 1677 cache_load(1); 1678 vlist_for_each_element(&devices, dev, node) 1679 mount_device(dev, TYPE_DEV); 1680 1681 handle_swapfiles(true); 1682 1683 return 0; 1684 } 1685 1686 static int main_umount(int argc, char **argv) 1687 { 1688 struct device *dev; 1689 struct probe_info *pr; 1690 bool all = false; 1691 1692 if (config_load(NULL)) 1693 return -1; 1694 1695 handle_swapfiles(false); 1696 1697 cache_load(0); 1698 1699 if (argc == 3) 1700 all = !strcmp(argv[2], "-a"); 1701 1702 vlist_for_each_element_reverse(&devices, dev, node) { 1703 struct mount *m; 1704 1705 pr = dev->pr; 1706 if (!strcmp(pr->type, "swap")) 1707 continue; 1708 1709 m = dev->m; 1710 if (m && m->extroot) 1711 continue; 1712 1713 umount_device(pr->dev, TYPE_DEV, all); 1714 } 1715 1716 return 0; 1717 } 1718 1719 static int main_detect(int argc, char **argv) 1720 { 1721 struct device *dev; 1722 1723 cache_load(0); 1724 printf("config 'global'\n"); 1725 printf("\toption\tanon_swap\t''\n"); 1726 printf("\toption\tanon_mount\t''\n"); 1727 printf("\toption\tauto_swap\t'1'\n"); 1728 printf("\toption\tauto_mount\t'1'\n"); 1729 printf("\toption\tdelay_root\t'5'\n"); 1730 printf("\toption\tcheck_fs\t''\n\n"); 1731 vlist_for_each_element(&devices, dev, node) 1732 print_block_uci(dev->pr); 1733 1734 return 0; 1735 } 1736 1737 static int main_info(int argc, char **argv) 1738 { 1739 int i; 1740 struct device *dev; 1741 1742 cache_load(1); 1743 if (argc == 2) { 1744 vlist_for_each_element(&devices, dev, node) 1745 print_block_info(dev->pr); 1746 1747 return 0; 1748 }; 1749 1750 for (i = 2; i < argc; i++) { 1751 struct stat s; 1752 1753 if (stat(argv[i], &s)) { 1754 ULOG_ERR("failed to stat %s\n", argv[i]); 1755 continue; 1756 } 1757 if (!S_ISBLK(s.st_mode) && !(S_ISCHR(s.st_mode) && major(s.st_rdev) == 250)) { 1758 ULOG_ERR("%s is not a block device\n", argv[i]); 1759 continue; 1760 } 1761 dev = find_block_device(NULL, NULL, argv[i]); 1762 if (dev) 1763 print_block_info(dev->pr); 1764 } 1765 1766 return 0; 1767 } 1768 1769 static int swapon_usage(void) 1770 { 1771 fprintf(stderr, "Usage: swapon [-s] [-a] [[-p pri] DEVICE]\n\n" 1772 "\tStart swapping on [DEVICE]\n" 1773 " -a\tStart swapping on all swap devices\n" 1774 " -p pri\tSet priority of swap device\n" 1775 " -s\tShow summary\n"); 1776 return -1; 1777 } 1778 1779 static int main_swapon(int argc, char **argv) 1780 { 1781 int ch; 1782 FILE *fp; 1783 char *lineptr; 1784 size_t s; 1785 struct device *dev; 1786 struct probe_info *pr; 1787 int flags = 0; 1788 int pri; 1789 struct stat st; 1790 int err; 1791 1792 while ((ch = getopt(argc, argv, "ap:s")) != -1) { 1793 switch(ch) { 1794 case 's': 1795 fp = fopen("/proc/swaps", "r"); 1796 lineptr = NULL; 1797 1798 if (!fp) { 1799 ULOG_ERR("failed to open /proc/swaps\n"); 1800 return -1; 1801 } 1802 while (getline(&lineptr, &s, fp) > 0) 1803 printf("%s", lineptr); 1804 if (lineptr) 1805 free(lineptr); 1806 fclose(fp); 1807 return 0; 1808 case 'a': 1809 cache_load(0); 1810 vlist_for_each_element(&devices, dev, node) { 1811 pr = dev->pr; 1812 if (strcmp(pr->type, "swap")) 1813 continue; 1814 if (swapon(pr->dev, 0)) 1815 ULOG_ERR("failed to swapon %s\n", pr->dev); 1816 } 1817 return 0; 1818 case 'p': 1819 pri = atoi(optarg); 1820 if (pri >= 0) 1821 flags = ((pri << SWAP_FLAG_PRIO_SHIFT) & SWAP_FLAG_PRIO_MASK) | SWAP_FLAG_PREFER; 1822 break; 1823 default: 1824 return swapon_usage(); 1825 } 1826 } 1827 1828 if (optind != (argc - 1)) 1829 return swapon_usage(); 1830 1831 if (stat(argv[optind], &st) || (!S_ISBLK(st.st_mode) && !S_ISREG(st.st_mode))) { 1832 ULOG_ERR("%s is not a block device or file\n", argv[optind]); 1833 return -1; 1834 } 1835 err = swapon(argv[optind], flags); 1836 if (err) { 1837 ULOG_ERR("failed to swapon %s (%d)\n", argv[optind], err); 1838 return err; 1839 } 1840 1841 return 0; 1842 } 1843 1844 static int main_swapoff(int argc, char **argv) 1845 { 1846 if (argc != 2) { 1847 ULOG_ERR("Usage: swapoff [-a] [DEVICE]\n\n" 1848 "\tStop swapping on DEVICE\n" 1849 " -a\tStop swapping on all swap devices\n"); 1850 return -1; 1851 } 1852 1853 if (!strcmp(argv[1], "-a")) { 1854 FILE *fp = fopen("/proc/swaps", "r"); 1855 char line[256]; 1856 1857 if (!fp) { 1858 ULOG_ERR("failed to open /proc/swaps\n"); 1859 return -1; 1860 } 1861 if (fgets(line, sizeof(line), fp)) 1862 while (fgets(line, sizeof(line), fp)) { 1863 char *end = strchr(line, ' '); 1864 int err; 1865 1866 if (!end) 1867 continue; 1868 *end = '\0'; 1869 err = swapoff(line); 1870 if (err) 1871 ULOG_ERR("failed to swapoff %s (%d)\n", line, err); 1872 } 1873 fclose(fp); 1874 } else { 1875 struct stat s; 1876 int err; 1877 1878 if (stat(argv[1], &s) || (!S_ISBLK(s.st_mode) && !S_ISREG(s.st_mode))) { 1879 ULOG_ERR("%s is not a block device or file\n", argv[1]); 1880 return -1; 1881 } 1882 err = swapoff(argv[1]); 1883 if (err) { 1884 ULOG_ERR("failed to swapoff %s (%d)\n", argv[1], err); 1885 return err; 1886 } 1887 } 1888 1889 return 0; 1890 } 1891 1892 int main(int argc, char **argv) 1893 { 1894 char *base = basename(*argv); 1895 1896 umask(0); 1897 1898 ulog_open(-1, -1, "block"); 1899 ulog_threshold(LOG_NOTICE); 1900 1901 if (!strcmp(base, "swapon")) 1902 return main_swapon(argc, argv); 1903 1904 if (!strcmp(base, "swapoff")) 1905 return main_swapoff(argc, argv); 1906 1907 if ((argc > 1) && !strcmp(base, "block")) { 1908 if (!strcmp(argv[1], "info")) 1909 return main_info(argc, argv); 1910 1911 if (!strcmp(argv[1], "detect")) 1912 return main_detect(argc, argv); 1913 1914 if (!strcmp(argv[1], "hotplug")) 1915 return main_hotplug(argc, argv); 1916 1917 if (!strcmp(argv[1], "autofs")) 1918 return main_autofs(argc, argv); 1919 1920 if (!strcmp(argv[1], "extroot")) 1921 return main_extroot(argc, argv); 1922 1923 if (!strcmp(argv[1], "mount")) 1924 return main_mount(argc, argv); 1925 1926 if (!strcmp(argv[1], "umount")) 1927 return main_umount(argc, argv); 1928 1929 if (!strcmp(argv[1], "remount")) { 1930 int ret = main_umount(argc, argv); 1931 1932 if (!ret) 1933 ret = main_mount(argc, argv); 1934 return ret; 1935 } 1936 } 1937 1938 ULOG_ERR("Usage: block <info|mount|umount|detect>\n"); 1939 1940 return -1; 1941 } 1942
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