block.c

   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 #include <stdio.h>
  16 #include <unistd.h>
  17 #include <syslog.h>
  18 #include <libgen.h>
  19 #include <glob.h>
  20
  21 #include <sys/stat.h>
  22 #include <sys/types.h>
  23 #include <sys/swap.h>
  24 #include <sys/mount.h>
  25 #include <sys/wait.h>
  26
  27 #include <uci.h>
  28 #include <uci_blob.h>
  29
  30 #include <libubox/list.h>
  31 #include <libubox/vlist.h>
  32 #include <libubox/blobmsg_json.h>
  33 #include <libubox/avl-cmp.h>
  34
  35 #include "libblkid-tiny/libblkid-tiny.h"
  36
  37 enum {
  38         TYPE_MOUNT,
  39         TYPE_SWAP,
  40 };
  41
  42 struct mount {
  43         struct vlist_node node;
  44         int type;
  45
  46         char *target;
  47         char *path;
  48         char *options;
  49         char *uuid;
  50         char *label;
  51         char *device;
  52         int extroot;
  53         int overlay;
  54         int disabled_fsck;
  55         unsigned int prio;
  56 };
  57
  58 static struct vlist_tree mounts;
  59 static struct blob_buf b;
  60 static LIST_HEAD(devices);
  61 static int anon_mount, anon_swap, auto_mount, auto_swap, check_fs;
  62 static unsigned int delay_root;
  63
  64 enum {
  65         CFG_ANON_MOUNT,
  66         CFG_ANON_SWAP,
  67         CFG_AUTO_MOUNT,
  68         CFG_AUTO_SWAP,
  69         CFG_DELAY_ROOT,
  70         CFG_CHECK_FS,
  71         __CFG_MAX
  72 };
  73
  74 static const struct blobmsg_policy config_policy[__CFG_MAX] = {
  75         [CFG_ANON_SWAP] = { .name = "anon_swap", .type = BLOBMSG_TYPE_INT32 },
  76         [CFG_ANON_MOUNT] = { .name = "anon_mount", .type = BLOBMSG_TYPE_INT32 },
  77         [CFG_AUTO_SWAP] = { .name = "auto_swap", .type = BLOBMSG_TYPE_INT32 },
  78         [CFG_AUTO_MOUNT] = { .name = "auto_mount", .type = BLOBMSG_TYPE_INT32 },
  79         [CFG_DELAY_ROOT] = { .name = "delay_root", .type = BLOBMSG_TYPE_INT32 },
  80         [CFG_CHECK_FS] = { .name = "check_fs", .type = BLOBMSG_TYPE_INT32 },
  81 };
  82
  83 enum {
  84         MOUNT_UUID,
  85         MOUNT_LABEL,
  86         MOUNT_ENABLE,
  87         MOUNT_TARGET,
  88         MOUNT_DEVICE,
  89         MOUNT_OPTIONS,
  90         __MOUNT_MAX
  91 };
  92
  93 static const struct uci_blob_param_list config_attr_list = {
  94         .n_params = __CFG_MAX,
  95         .params = config_policy,
  96 };
  97
  98 static const struct blobmsg_policy mount_policy[__MOUNT_MAX] = {
  99         [MOUNT_UUID] = { .name = "uuid", .type = BLOBMSG_TYPE_STRING },
 100         [MOUNT_LABEL] = { .name = "label", .type = BLOBMSG_TYPE_STRING },
 101         [MOUNT_DEVICE] = { .name = "device", .type = BLOBMSG_TYPE_STRING },
 102         [MOUNT_TARGET] = { .name = "target", .type = BLOBMSG_TYPE_STRING },
 103         [MOUNT_OPTIONS] = { .name = "options", .type = BLOBMSG_TYPE_STRING },
 104         [MOUNT_ENABLE] = { .name = "enabled", .type = BLOBMSG_TYPE_INT32 },
 105 };
 106
 107 static const struct uci_blob_param_list mount_attr_list = {
 108         .n_params = __MOUNT_MAX,
 109         .params = mount_policy,
 110 };
 111
 112 enum {
 113         SWAP_ENABLE,
 114         SWAP_UUID,
 115         SWAP_DEVICE,
 116         SWAP_PRIO,
 117         __SWAP_MAX
 118 };
 119
 120 static const struct blobmsg_policy swap_policy[__SWAP_MAX] = {
 121         [SWAP_ENABLE] = { .name = "enabled", .type = BLOBMSG_TYPE_INT32 },
 122         [SWAP_UUID] = { .name = "uuid", .type = BLOBMSG_TYPE_STRING },
 123         [SWAP_DEVICE] = { .name = "device", .type = BLOBMSG_TYPE_STRING },
 124         [SWAP_PRIO] = { .name = "priority", .type = BLOBMSG_TYPE_INT32 },
 125 };
 126
 127 static const struct uci_blob_param_list swap_attr_list = {
 128         .n_params = __SWAP_MAX,
 129         .params = swap_policy,
 130 };
 131
 132 static char *blobmsg_get_strdup(struct blob_attr *attr)
 133 {
 134         if (!attr)
 135                 return NULL;
 136
 137         return strdup(blobmsg_get_string(attr));
 138 }
 139
 140 static char *blobmsg_get_basename(struct blob_attr *attr)
 141 {
 142         if (!attr)
 143                 return NULL;
 144
 145         return strdup(basename(blobmsg_get_string(attr)));
 146 }
 147
 148 static int mount_add(struct uci_section *s)
 149 {
 150         struct blob_attr *tb[__MOUNT_MAX] = { 0 };
 151         struct mount *m;
 152
 153         blob_buf_init(&b, 0);
 154         uci_to_blob(&b, s, &mount_attr_list);
 155         blobmsg_parse(mount_policy, __MOUNT_MAX, tb, blob_data(b.head), blob_len(b.head));
 156
 157         if (!tb[MOUNT_LABEL] && !tb[MOUNT_UUID] && !tb[MOUNT_DEVICE])
 158                 return -1;
 159
 160         if (tb[MOUNT_ENABLE] && !blobmsg_get_u32(tb[MOUNT_ENABLE]))
 161                 return -1;
 162
 163         m = malloc(sizeof(struct mount));
 164         m->type = TYPE_MOUNT;
 165         m->uuid = blobmsg_get_strdup(tb[MOUNT_UUID]);
 166         m->label = blobmsg_get_strdup(tb[MOUNT_LABEL]);
 167         m->target = blobmsg_get_strdup(tb[MOUNT_TARGET]);
 168         m->options = blobmsg_get_strdup(tb[MOUNT_OPTIONS]);
 169         m->device = blobmsg_get_basename(tb[MOUNT_DEVICE]);
 170         m->overlay = m->extroot = 0;
 171         if (m->target && !strcmp(m->target, "/"))
 172                 m->extroot = 1;
 173         if (m->target && !strcmp(m->target, "/overlay"))
 174                 m->extroot = m->overlay = 1;
 175
 176         if (m->uuid)
 177                 vlist_add(&mounts, &m->node, m->uuid);
 178         else if (m->label)
 179                 vlist_add(&mounts, &m->node, m->label);
 180         else if (m->device)
 181                 vlist_add(&mounts, &m->node, m->device);
 182
 183         return 0;
 184 }
 185
 186 static int swap_add(struct uci_section *s)
 187 {
 188         struct blob_attr *tb[__SWAP_MAX] = { 0 };
 189         struct mount *m;
 190
 191         blob_buf_init(&b, 0);
 192         uci_to_blob(&b, s, &swap_attr_list);
 193         blobmsg_parse(swap_policy, __SWAP_MAX, tb, blob_data(b.head), blob_len(b.head));
 194
 195         if (!tb[SWAP_UUID] && !tb[SWAP_DEVICE])
 196                 return -1;
 197
 198         m = malloc(sizeof(struct mount));
 199         memset(m, 0, sizeof(struct mount));
 200         m->type = TYPE_SWAP;
 201         m->uuid = blobmsg_get_strdup(tb[SWAP_UUID]);
 202         m->device = blobmsg_get_basename(tb[SWAP_DEVICE]);
 203         if (tb[SWAP_PRIO])
 204                 m->prio = blobmsg_get_u32(tb[SWAP_PRIO]);
 205         if (m->prio)
 206                 m->prio = ((m->prio << SWAP_FLAG_PRIO_SHIFT) & SWAP_FLAG_PRIO_MASK) | SWAP_FLAG_PREFER;
 207
 208         if ((!tb[SWAP_ENABLE]) || blobmsg_get_u32(tb[SWAP_ENABLE]))
 209                 vlist_add(&mounts, &m->node, (m->uuid) ? (m->uuid) : (m->device));
 210
 211         return 0;
 212 }
 213
 214 static int global_add(struct uci_section *s)
 215 {
 216         struct blob_attr *tb[__CFG_MAX] = { 0 };
 217
 218         blob_buf_init(&b, 0);
 219         uci_to_blob(&b, s, &config_attr_list);
 220         blobmsg_parse(config_policy, __CFG_MAX, tb, blob_data(b.head), blob_len(b.head));
 221
 222         if ((tb[CFG_ANON_MOUNT]) && blobmsg_get_u32(tb[CFG_ANON_MOUNT]))
 223                 anon_mount = 1;
 224         if ((tb[CFG_ANON_SWAP]) && blobmsg_get_u32(tb[CFG_ANON_SWAP]))
 225                 anon_swap = 1;
 226
 227         if ((tb[CFG_AUTO_MOUNT]) && blobmsg_get_u32(tb[CFG_AUTO_MOUNT]))
 228                 auto_mount = 1;
 229         if ((tb[CFG_AUTO_SWAP]) && blobmsg_get_u32(tb[CFG_AUTO_SWAP]))
 230                 auto_swap = 1;
 231
 232         if (tb[CFG_DELAY_ROOT])
 233                 delay_root = blobmsg_get_u32(tb[CFG_DELAY_ROOT]);
 234
 235         if ((tb[CFG_CHECK_FS]) && blobmsg_get_u32(tb[CFG_CHECK_FS]))
 236                 check_fs = 1;
 237
 238         return 0;
 239 }
 240
 241 static struct mount* find_swap(const char *uuid, const char *device)
 242 {
 243         struct mount *m;
 244
 245         vlist_for_each_element(&mounts, m, node) {
 246                 if (m->type != TYPE_SWAP)
 247                         continue;
 248                 if (uuid && m->uuid && !strcmp(m->uuid, uuid))
 249                         return m;
 250                 if (device && m->device && !strcmp(m->device, device))
 251                         return m;
 252         }
 253
 254         return NULL;
 255 }
 256
 257 static struct mount* find_block(const char *uuid, const char *label, const char *device,
 258                                 const char *target)
 259 {
 260         struct mount *m;
 261
 262         vlist_for_each_element(&mounts, m, node) {
 263                 if (m->type != TYPE_MOUNT)
 264                         continue;
 265                 if (m->uuid && uuid && !strcmp(m->uuid, uuid))
 266                         return m;
 267                 if (m->label && label && !strcmp(m->label, label))
 268                         return m;
 269                 if (m->target && target && !strcmp(m->target, target))
 270                         return m;
 271                 if (m->device && device && !strcmp(m->device, device))
 272                         return m;
 273         }
 274
 275         return NULL;
 276 }
 277
 278 static void mounts_update(struct vlist_tree *tree, struct vlist_node *node_new,
 279                           struct vlist_node *node_old)
 280 {
 281 }
 282
 283 static int config_load(char *cfg)
 284 {
 285         struct uci_context *ctx;
 286         struct uci_package *pkg;
 287         struct uci_element *e;
 288
 289         vlist_init(&mounts, avl_strcmp, mounts_update);
 290
 291         ctx = uci_alloc_context();
 292         if (cfg) {
 293                 char path[32];
 294                 snprintf(path, 32, "%s/etc/config", cfg);
 295                 uci_set_confdir(ctx, path);
 296         }
 297
 298         if (uci_load(ctx, "fstab", &pkg))
 299                 return -1;
 300
 301         vlist_update(&mounts);
 302         uci_foreach_element(&pkg->sections, e) {
 303                 struct uci_section *s = uci_to_section(e);
 304
 305                 if (!strcmp(s->type, "mount"))
 306                         mount_add(s);
 307                 if (!strcmp(s->type, "swap"))
 308                         swap_add(s);
 309                 if (!strcmp(s->type, "global"))
 310                         global_add(s);
 311         }
 312         vlist_flush(&mounts);
 313
 314         return 0;
 315 }
 316
 317 static int _cache_load(const char *path)
 318 {
 319         int gl_flags = GLOB_NOESCAPE | GLOB_MARK;
 320         int j;
 321         glob_t gl;
 322
 323         if (glob(path, gl_flags, NULL, &gl) < 0)
 324                 return -1;
 325
 326         for (j = 0; j < gl.gl_pathc; j++) {
 327                 struct blkid_struct_probe *pr = malloc(sizeof(struct blkid_struct_probe));
 328                 memset(pr, 0, sizeof(struct blkid_struct_probe));
 329                 probe_block(gl.gl_pathv[j], pr);
 330                 if (pr->err || !pr->id)
 331                         free(pr);
 332                 else
 333                         list_add_tail(&pr->list, &devices);
 334         }
 335
 336         globfree(&gl);
 337
 338         return 0;
 339 }
 340
 341 static void cache_load(int mtd)
 342 {
 343         if (mtd)
 344                 _cache_load("/dev/mtdblock*");
 345         _cache_load("/dev/mmcblk*");
 346         _cache_load("/dev/sd*");
 347         _cache_load("/dev/sdc*");
 348         _cache_load("/dev/hd*");
 349 }
 350
 351 static int print_block_info(struct blkid_struct_probe *pr)
 352 {
 353         printf("%s:", pr->dev);
 354         if (pr->uuid[0])
 355                 printf(" UUID=\"%s\"", pr->uuid);
 356
 357         if (pr->label[0])
 358                 printf(" LABEL=\"%s\"", pr->label);
 359
 360         if (pr->name[0])
 361                 printf(" NAME=\"%s\"", pr->name);
 362
 363         if (pr->version[0])
 364                 printf(" VERSION=\"%s\"", pr->version);
 365
 366         printf(" TYPE=\"%s\"\n", pr->id->name);
 367
 368         return 0;
 369 }
 370
 371 static int print_block_uci(struct blkid_struct_probe *pr)
 372 {
 373         if (!strcmp(pr->id->name, "swap")) {
 374                 printf("config 'swap'\n");
 375         } else {
 376                 printf("config 'mount'\n");
 377                 printf("\toption\ttarget\t'/mnt/%s'\n", basename(pr->dev));
 378         }
 379         if (pr->uuid[0])
 380                 printf("\toption\tuuid\t'%s'\n", pr->uuid);
 381         else
 382                 printf("\toption\tdevice\t'%s'\n", pr->dev);
 383         printf("\toption\tenabled\t'0'\n\n");
 384
 385         return 0;
 386 }
 387
 388 static struct blkid_struct_probe* find_block_info(char *uuid, char *label, char *path)
 389 {
 390         struct blkid_struct_probe *pr = NULL;
 391
 392         if (uuid)
 393                 list_for_each_entry(pr, &devices, list)
 394                         if (!strcmp(pr->uuid, uuid))
 395                                 return pr;
 396
 397         if (label)
 398                 list_for_each_entry(pr, &devices, list)
 399                         if (strcmp(pr->label, label))
 400                                 return pr;
 401
 402         if (path)
 403                 list_for_each_entry(pr, &devices, list)
 404                         if (!strcmp(pr->dev, path))
 405                                 return pr;
 406
 407         return NULL;
 408 }
 409
 410 static char* find_mount_point(char *block)
 411 {
 412         FILE *fp = fopen("/proc/mounts", "r");
 413         static char line[256];
 414         int len = strlen(block);
 415         char *point = NULL;
 416
 417         if(!fp)
 418                 return NULL;
 419
 420         while (fgets(line, sizeof(line), fp)) {
 421                 if (!strncmp(line, block, len)) {
 422                         char *p = &line[len + 1];
 423                         char *t = strstr(p, " ");
 424
 425                         if (!t)
 426                                 return NULL;
 427                         *t = '\0';
 428                         point = p;
 429                         break;
 430                 }
 431         }
 432
 433         fclose(fp);
 434
 435         return point;
 436 }
 437
 438 static void mkdir_p(char *dir)
 439 {
 440         char *l = strrchr(dir, '/');
 441
 442         if (l) {
 443                 *l = '\0';
 444                 mkdir_p(dir);
 445                 *l = '/';
 446                 mkdir(dir, 0755);
 447         }
 448 }
 449
 450 static void check_filesystem(struct blkid_struct_probe *pr)
 451 {
 452         pid_t pid;
 453         struct stat statbuf;
 454         char *e2fsck = "/usr/sbin/e2fsck";
 455
 456         if (strncmp(pr->id->name, "ext", 3)) {
 457                 fprintf(stderr, "check_filesystem: %s is not supported\n", pr->id->name);
 458                 return;
 459         }
 460
 461         if (stat(e2fsck, &statbuf) < 0) {
 462                 fprintf(stderr, "check_filesystem: %s not found\n", e2fsck);
 463                 return;
 464         }
 465
 466         pid = fork();
 467         if (!pid) {
 468                 execl(e2fsck, e2fsck, "-p", pr->dev, NULL);
 469                 exit(-1);
 470         } else if (pid > 0) {
 471                 int status;
 472
 473                 waitpid(pid, &status, 0);
 474                 if (WEXITSTATUS(status))
 475                         fprintf(stderr, "check_filesystem: %s returned %d\n", e2fsck, WEXITSTATUS(status));
 476         }
 477 }
 478
 479 static int mount_device(struct blkid_struct_probe *pr, int hotplug)
 480 {
 481         struct mount *m;
 482         char *device = basename(pr->dev);
 483
 484         if (!pr)
 485                 return -1;
 486
 487         if (!strcmp(pr->id->name, "swap")) {
 488                 if (hotplug && !auto_swap)
 489                         return -1;
 490                 m = find_swap(pr->uuid, device);
 491                 if (m || anon_swap)
 492                         swapon(pr->dev, (m) ? (m->prio) : (0));
 493
 494                 return 0;
 495         }
 496
 497         if (hotplug && !auto_mount)
 498                 return -1;
 499
 500         if (find_mount_point(pr->dev)) {
 501                 fprintf(stderr, "%s is already mounted\n", pr->dev);
 502                 return -1;
 503         }
 504
 505         m = find_block(pr->uuid, pr->label, device, NULL);
 506         if (m && m->extroot)
 507                 return -1;
 508
 509         if (m) {
 510                 char *target = m->target;
 511                 char _target[] = "/mnt/mmcblk123";
 512                 int err = 0;
 513
 514                 if (!target) {
 515                         snprintf(_target, sizeof(_target), "/mnt/%s", device);
 516                         target = _target;
 517                 }
 518                 mkdir_p(target);
 519
 520                 if (check_fs)
 521                         check_filesystem(pr);
 522
 523                 err = mount(pr->dev, target, pr->id->name, 0, (m->options) ? (m->options) : (""));
 524                 if (err)
 525                         fprintf(stderr, "mounting %s (%s) as %s failed (%d) - %s\n",
 526                                         pr->dev, pr->id->name, target, err, strerror(err));
 527                 return err;
 528         }
 529
 530         if (anon_mount) {
 531                 char target[] = "/mnt/mmcblk123";
 532                 int err = 0;
 533
 534                 snprintf(target, sizeof(target), "/mnt/%s", device);
 535                 mkdir_p(target);
 536
 537                 if (check_fs)
 538                         check_filesystem(pr);
 539
 540                 err = mount(pr->dev, target, pr->id->name, 0, "");
 541                 if (err)
 542                         fprintf(stderr, "mounting %s (%s) as %s failed (%d) - %s\n",
 543                                         pr->dev, pr->id->name, target, err, strerror(err));
 544                 return err;
 545         }
 546
 547         return 0;
 548 }
 549
 550 static int umount_device(struct blkid_struct_probe *pr)
 551 {
 552         struct mount *m;
 553         char *device = basename(pr->dev);
 554         char *mp;
 555         int err;
 556
 557         if (!pr)
 558                 return -1;
 559
 560         if (!strcmp(pr->id->name, "swap"))
 561                 return -1;
 562
 563         mp = find_mount_point(pr->dev);
 564         if (!mp)
 565                 return -1;
 566
 567         m = find_block(pr->uuid, pr->label, device, NULL);
 568         if (m && m->extroot)
 569                 return -1;
 570
 571         err = umount2(mp, MNT_DETACH);
 572         if (err)
 573                 fprintf(stderr, "unmounting %s (%s)  failed (%d) - %s\n",
 574                         pr->dev, mp, err, strerror(err));
 575         else
 576                 fprintf(stderr, "unmounted %s (%s)\n",
 577                         pr->dev, mp);
 578
 579         return err;
 580 }
 581
 582 static int main_hotplug(int argc, char **argv)
 583 {
 584         char path[32];
 585         char *action, *device, *mount_point;
 586
 587         action = getenv("ACTION");
 588         device = getenv("DEVNAME");
 589
 590         if (!action || !device)
 591                 return -1;
 592         snprintf(path, sizeof(path), "/dev/%s", device);
 593
 594         if (!strcmp(action, "remove")) {
 595                 int err = 0;
 596                 mount_point = find_mount_point(path);
 597                 if (mount_point)
 598                         err = umount2(mount_point, MNT_DETACH);
 599
 600                 if (err)
 601                         fprintf(stderr, "umount of %s failed (%d) - %s\n",
 602                                         mount_point, err, strerror(err));
 603
 604                 return 0;
 605         } else if (strcmp(action, "add")) {
 606                 fprintf(stderr, "Unkown action %s\n", action);
 607
 608                 return -1;
 609         }
 610
 611         if (config_load(NULL))
 612                 return -1;
 613         cache_load(0);
 614
 615         return mount_device(find_block_info(NULL, NULL, path), 1);
 616 }
 617
 618 static int find_block_mtd(char *name, char *part, int plen)
 619 {
 620         FILE *fp = fopen("/proc/mtd", "r");
 621         static char line[256];
 622         char *index = NULL;
 623
 624         if(!fp)
 625                 return -1;
 626
 627         while (!index && fgets(line, sizeof(line), fp)) {
 628                 if (strstr(line, name)) {
 629                         char *eol = strstr(line, ":");
 630
 631                         if (!eol)
 632                                 continue;
 633
 634                         *eol = '\0';
 635                         index = &line[3];
 636                 }
 637         }
 638
 639         fclose(fp);
 640
 641         if (!index)
 642                 return -1;
 643
 644         snprintf(part, plen, "/dev/mtdblock%s", index);
 645
 646         return 0;
 647 }
 648
 649 static int check_extroot(char *path)
 650 {
 651         struct blkid_struct_probe *pr = NULL;
 652         char fs[32];
 653
 654         if (find_block_mtd("rootfs", fs, sizeof(fs)))
 655                 return -1;
 656
 657         list_for_each_entry(pr, &devices, list) {
 658                 if (!strcmp(pr->dev, fs)) {
 659                         struct stat s;
 660                         FILE *fp = NULL;
 661                         char tag[32];
 662                         char uuid[32] = { 0 };
 663
 664                         snprintf(tag, sizeof(tag), "%s/etc/.extroot-uuid", path);
 665                         if (stat(tag, &s)) {
 666                                 fp = fopen(tag, "w+");
 667                                 if (!fp) {
 668                                         fprintf(stderr, "extroot: failed to write uuid tag file\n");
 669                                         /* return 0 to continue boot regardless of error */
 670                                         return 0;
 671                                 }
 672                                 fputs(pr->uuid, fp);
 673                                 fclose(fp);
 674                                 return 0;
 675                         }
 676
 677                         fp = fopen(tag, "r");
 678                         if (!fp) {
 679                                 fprintf(stderr, "extroot: failed to open uuid tag file\n");
 680                                 return -1;
 681                         }
 682
 683                         fgets(uuid, sizeof(uuid), fp);
 684                         fclose(fp);
 685                         if (!strcmp(uuid, pr->uuid))
 686                                 return 0;
 687                         fprintf(stderr, "extroot: uuid tag does not match rom uuid\n");
 688                 }
 689         }
 690         return -1;
 691 }
 692
 693 static int mount_extroot(char *cfg)
 694 {
 695         char overlay[] = "/tmp/overlay";
 696         char mnt[] = "/tmp/mnt";
 697         char *path = mnt;
 698         struct blkid_struct_probe *pr;
 699         struct mount *m;
 700         int err = -1;
 701
 702         if (config_load(cfg))
 703                 return -2;
 704
 705         m = find_block(NULL, NULL, NULL, "/");
 706         if (!m)
 707                 m = find_block(NULL, NULL, NULL, "/overlay");
 708
 709         if (!m || !m->extroot)
 710                 return -1;
 711
 712         pr = find_block_info(m->uuid, m->label, NULL);
 713
 714         if (!pr && delay_root){
 715                 fprintf(stderr, "extroot: is not ready yet, retrying in %ui seconds\n", delay_root);
 716                 sleep(delay_root);
 717                 mkblkdev();
 718                 cache_load(0);
 719                 pr = find_block_info(m->uuid, m->label, NULL);
 720         }
 721         if (pr) {
 722                 if (strncmp(pr->id->name, "ext", 3)) {
 723                         fprintf(stderr, "extroot: %s is not supported, try ext4\n", pr->id->name);
 724                         return -1;
 725                 }
 726                 if (m->overlay)
 727                         path = overlay;
 728                 mkdir_p(path);
 729
 730                 if (check_fs)
 731                         check_filesystem(pr);
 732
 733                 err = mount(pr->dev, path, pr->id->name, 0, (m->options) ? (m->options) : (""));
 734
 735                 if (err) {
 736                         fprintf(stderr, "mounting %s (%s) as %s failed (%d) - %s\n",
 737                                         pr->dev, pr->id->name, path, err, strerror(err));
 738                 } else if (m->overlay) {
 739                         err = check_extroot(path);
 740                         if (err)
 741                                 umount(path);
 742                 }
 743         }
 744
 745         return err;
 746 }
 747
 748 static int main_extroot(int argc, char **argv)
 749 {
 750         struct blkid_struct_probe *pr;
 751         char fs[32] = { 0 };
 752         char fs_data[32] = { 0 };
 753         int err = -1;
 754
 755         if (!getenv("PREINIT"))
 756                 return -1;
 757
 758         if (argc != 2) {
 759                 fprintf(stderr, "Usage: block extroot mountpoint\n");
 760                 return -1;
 761         }
 762
 763         mkblkdev();
 764         cache_load(1);
 765
 766         find_block_mtd("rootfs", fs, sizeof(fs));
 767         if (!fs[0])
 768                 return -2;
 769
 770         pr = find_block_info(NULL, NULL, fs);
 771         if (!pr)
 772                 return -3;
 773
 774         find_block_mtd("rootfs_data", fs_data, sizeof(fs_data));
 775         if (fs_data[0]) {
 776                 pr = find_block_info(NULL, NULL, fs_data);
 777                 if (pr && !strcmp(pr->id->name, "jffs2")) {
 778                         char cfg[] = "/tmp/jffs_cfg";
 779
 780                         mkdir_p(cfg);
 781                         if (!mount(fs_data, cfg, "jffs2", MS_NOATIME, NULL)) {
 782                                 err = mount_extroot(cfg);
 783                                 umount2(cfg, MNT_DETACH);
 784                         }
 785                         if (err < 0)
 786                                 rmdir("/tmp/overlay");
 787                         rmdir(cfg);
 788                         return err;
 789                 }
 790         }
 791
 792         return mount_extroot(NULL);
 793 }
 794
 795 static int main_mount(int argc, char **argv)
 796 {
 797         struct blkid_struct_probe *pr;
 798
 799         if (config_load(NULL))
 800                 return -1;
 801
 802         cache_load(0);
 803         list_for_each_entry(pr, &devices, list)
 804                 mount_device(pr, 0);
 805
 806         return 0;
 807 }
 808
 809 static int main_umount(int argc, char **argv)
 810 {
 811         struct blkid_struct_probe *pr;
 812
 813         if (config_load(NULL))
 814                 return -1;
 815
 816         cache_load(0);
 817         list_for_each_entry(pr, &devices, list)
 818                 umount_device(pr);
 819
 820         return 0;
 821 }
 822
 823 static int main_detect(int argc, char **argv)
 824 {
 825         struct blkid_struct_probe *pr;
 826
 827         cache_load(0);
 828         printf("config 'global'\n");
 829         printf("\toption\tanon_swap\t'0'\n");
 830         printf("\toption\tanon_mount\t'0'\n");
 831         printf("\toption\tauto_swap\t'1'\n");
 832         printf("\toption\tauto_mount\t'1'\n");
 833         printf("\toption\tdelay_root\t'0'\n");
 834         printf("\toption\tcheck_fs\t'0'\n\n");
 835         list_for_each_entry(pr, &devices, list)
 836                 print_block_uci(pr);
 837
 838         return 0;
 839 }
 840
 841 static int main_info(int argc, char **argv)
 842 {
 843         int i;
 844         struct blkid_struct_probe *pr;
 845
 846         cache_load(1);
 847         if (argc == 2) {
 848                 list_for_each_entry(pr, &devices, list)
 849                         print_block_info(pr);
 850
 851                 return 0;
 852         };
 853
 854         for (i = 2; i < argc; i++) {
 855                 struct stat s;
 856
 857                 if (stat(argv[i], &s)) {
 858                         fprintf(stderr, "failed to stat %s\n", argv[i]);
 859                         continue;
 860                 }
 861                 if (!S_ISBLK(s.st_mode)) {
 862                         fprintf(stderr, "%s is not a block device\n", argv[i]);
 863                         continue;
 864                 }
 865                 pr = find_block_info(NULL, NULL, argv[i]);
 866                 if (pr)
 867                         print_block_info(pr);
 868         }
 869
 870         return 0;
 871 }
 872
 873 static int main_swapon(int argc, char **argv)
 874 {
 875         if (argc != 2) {
 876                 fprintf(stderr, "Usage: swapoff [-a] [DEVICE]\n\nStop swapping on DEVICE\n\n\t-a      Stop swapping on all swap devices\n");
 877                 return -1;
 878         }
 879
 880         if (!strcmp(argv[1], "-a")) {
 881                 struct blkid_struct_probe *pr;
 882
 883                 cache_load(0);
 884                 list_for_each_entry(pr, &devices, list) {
 885                         if (strcmp(pr->id->name, "swap"))
 886                                 continue;
 887                         if (swapon(pr->dev, 0))
 888                                 fprintf(stderr, "failed to swapon %s\n", pr->dev);
 889                 }
 890         } else {
 891                 struct stat s;
 892                 int err;
 893
 894                 if (stat(argv[1], &s) || !S_ISBLK(s.st_mode)) {
 895                         fprintf(stderr, "%s is not a block device\n", argv[1]);
 896                         return -1;
 897                 }
 898                 err = swapon(argv[1], 0);
 899                 if (err) {
 900                         fprintf(stderr, "failed to swapon %s (%d)\n", argv[1], err);
 901                         return err;
 902                 }
 903         }
 904
 905         return 0;
 906 }
 907
 908 static int main_swapoff(int argc, char **argv)
 909 {
 910         if (argc != 2) {
 911                 fprintf(stderr, "Usage: swapoff [-a] [DEVICE]\n\nStop swapping on DEVICE\n\n\t-a      Stop swapping on all swap devices\n");
 912                 return -1;
 913         }
 914
 915         if (!strcmp(argv[1], "-a")) {
 916                 FILE *fp = fopen("/proc/swaps", "r");
 917                 char line[256];
 918
 919                 if (!fp) {
 920                         fprintf(stderr, "failed to open /proc/swaps\n");
 921                         return -1;
 922                 }
 923                 fgets(line, sizeof(line), fp);
 924                 while (fgets(line, sizeof(line), fp)) {
 925                         char *end = strchr(line, ' ');
 926                         int err;
 927
 928                         if (!end)
 929                                 continue;
 930                         *end = '\0';
 931                         err = swapoff(line);
 932                         if (err)
 933                                 fprintf(stderr, "failed to swapoff %s (%d)\n", line, err);
 934                 }
 935                 fclose(fp);
 936         } else {
 937                 struct stat s;
 938                 int err;
 939
 940                 if (stat(argv[1], &s) || !S_ISBLK(s.st_mode)) {
 941                         fprintf(stderr, "%s is not a block device\n", argv[1]);
 942                         return -1;
 943                 }
 944                 err = swapoff(argv[1]);
 945                 if (err) {
 946                         fprintf(stderr, "fsiled to swapoff %s (%d)\n", argv[1], err);
 947                         return err;
 948                 }
 949         }
 950
 951         return 0;
 952 }
 953
 954 int main(int argc, char **argv)
 955 {
 956         char *base = basename(*argv);
 957
 958         umask(0);
 959
 960         if (!strcmp(base, "swapon"))
 961                 return main_swapon(argc, argv);
 962
 963         if (!strcmp(base, "swapoff"))
 964                 return main_swapoff(argc, argv);
 965
 966         if ((argc > 1) && !strcmp(base, "block")) {
 967                 if (!strcmp(argv[1], "info"))
 968                         return main_info(argc, argv);
 969
 970                 if (!strcmp(argv[1], "detect"))
 971                         return main_detect(argc, argv);
 972
 973                 if (!strcmp(argv[1], "hotplug"))
 974                         return main_hotplug(argc, argv);
 975
 976                 if (!strcmp(argv[1], "extroot"))
 977                         return main_extroot(argc, argv);
 978
 979                 if (!strcmp(argv[1], "mount"))
 980                         return main_mount(argc, argv);
 981
 982                 if (!strcmp(argv[1], "umount"))
 983                         return main_umount(argc, argv);
 984         }
 985
 986         fprintf(stderr, "Usage: block <info|mount|umount|detect>\n");
 987
 988         return -1;
 989 }