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