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 #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
  26 #include <sys/stat.h>
  27 #include <sys/types.h>
  28 #include <sys/swap.h>
  29 #include <sys/mount.h>
  30 #include <sys/wait.h>
  31
  32 #include <linux/fs.h>
  33
  34 #include <uci.h>
  35 #include <uci_blob.h>
  36
  37 #include <libubox/ulog.h>
  38 #include <libubox/list.h>
  39 #include <libubox/vlist.h>
  40 #include <libubox/blobmsg_json.h>
  41 #include <libubox/avl-cmp.h>
  42
  43 #include "libblkid-tiny/libblkid-tiny.h"
  44
  45 #ifdef UBIFS_EXTROOT
  46 #include "libubi/libubi.h"
  47 #endif
  48
  49 enum {
  50         TYPE_MOUNT,
  51         TYPE_SWAP,
  52 };
  53
  54 struct mount {
  55         struct vlist_node node;
  56         int type;
  57
  58         char *target;
  59         char *path;
  60         char *options;
  61         uint32_t flags;
  62         char *uuid;
  63         char *label;
  64         char *device;
  65         int extroot;
  66         int overlay;
  67         int disabled_fsck;
  68         unsigned int prio;
  69 };
  70
  71 static struct vlist_tree mounts;
  72 static struct blob_buf b;
  73 static LIST_HEAD(devices);
  74 static int anon_mount, anon_swap, auto_mount, auto_swap, check_fs;
  75 static unsigned int delay_root;
  76
  77 enum {
  78         CFG_ANON_MOUNT,
  79         CFG_ANON_SWAP,
  80         CFG_AUTO_MOUNT,
  81         CFG_AUTO_SWAP,
  82         CFG_DELAY_ROOT,
  83         CFG_CHECK_FS,
  84         __CFG_MAX
  85 };
  86
  87 static const struct blobmsg_policy config_policy[__CFG_MAX] = {
  88         [CFG_ANON_SWAP] = { .name = "anon_swap", .type = BLOBMSG_TYPE_INT32 },
  89         [CFG_ANON_MOUNT] = { .name = "anon_mount", .type = BLOBMSG_TYPE_INT32 },
  90         [CFG_AUTO_SWAP] = { .name = "auto_swap", .type = BLOBMSG_TYPE_INT32 },
  91         [CFG_AUTO_MOUNT] = { .name = "auto_mount", .type = BLOBMSG_TYPE_INT32 },
  92         [CFG_DELAY_ROOT] = { .name = "delay_root", .type = BLOBMSG_TYPE_INT32 },
  93         [CFG_CHECK_FS] = { .name = "check_fs", .type = BLOBMSG_TYPE_INT32 },
  94 };
  95
  96 enum {
  97         MOUNT_UUID,
  98         MOUNT_LABEL,
  99         MOUNT_ENABLE,
 100         MOUNT_TARGET,
 101         MOUNT_DEVICE,
 102         MOUNT_OPTIONS,
 103         __MOUNT_MAX
 104 };
 105
 106 static const struct uci_blob_param_list config_attr_list = {
 107         .n_params = __CFG_MAX,
 108         .params = config_policy,
 109 };
 110
 111 static const struct blobmsg_policy mount_policy[__MOUNT_MAX] = {
 112         [MOUNT_UUID] = { .name = "uuid", .type = BLOBMSG_TYPE_STRING },
 113         [MOUNT_LABEL] = { .name = "label", .type = BLOBMSG_TYPE_STRING },
 114         [MOUNT_DEVICE] = { .name = "device", .type = BLOBMSG_TYPE_STRING },
 115         [MOUNT_TARGET] = { .name = "target", .type = BLOBMSG_TYPE_STRING },
 116         [MOUNT_OPTIONS] = { .name = "options", .type = BLOBMSG_TYPE_STRING },
 117         [MOUNT_ENABLE] = { .name = "enabled", .type = BLOBMSG_TYPE_INT32 },
 118 };
 119
 120 static const struct uci_blob_param_list mount_attr_list = {
 121         .n_params = __MOUNT_MAX,
 122         .params = mount_policy,
 123 };
 124
 125 enum {
 126         SWAP_ENABLE,
 127         SWAP_UUID,
 128         SWAP_LABEL,
 129         SWAP_DEVICE,
 130         SWAP_PRIO,
 131         __SWAP_MAX
 132 };
 133
 134 static const struct blobmsg_policy swap_policy[__SWAP_MAX] = {
 135         [SWAP_ENABLE] = { .name = "enabled", .type = BLOBMSG_TYPE_INT32 },
 136         [SWAP_UUID] = { .name = "uuid", .type = BLOBMSG_TYPE_STRING },
 137         [SWAP_LABEL] = { .name = "label", .type = BLOBMSG_TYPE_STRING },
 138         [SWAP_DEVICE] = { .name = "device", .type = BLOBMSG_TYPE_STRING },
 139         [SWAP_PRIO] = { .name = "priority", .type = BLOBMSG_TYPE_INT32 },
 140 };
 141
 142 static const struct uci_blob_param_list swap_attr_list = {
 143         .n_params = __SWAP_MAX,
 144         .params = swap_policy,
 145 };
 146
 147 struct mount_flag {
 148         const char *name;
 149         int32_t flag;
 150 };
 151
 152 static const struct mount_flag mount_flags[] = {
 153         { "sync",               MS_SYNCHRONOUS  },
 154         { "async",              ~MS_SYNCHRONOUS },
 155         { "dirsync",            MS_DIRSYNC      },
 156         { "mand",               MS_MANDLOCK     },
 157         { "nomand",             ~MS_MANDLOCK    },
 158         { "atime",              ~MS_NOATIME     },
 159         { "noatime",            MS_NOATIME      },
 160         { "dev",                ~MS_NODEV       },
 161         { "nodev",              MS_NODEV        },
 162         { "diratime",           ~MS_NODIRATIME  },
 163         { "nodiratime",         MS_NODIRATIME   },
 164         { "exec",               ~MS_NOEXEC      },
 165         { "noexec",             MS_NOEXEC       },
 166         { "suid",               ~MS_NOSUID      },
 167         { "nosuid",             MS_NOSUID       },
 168         { "rw",                 ~MS_RDONLY      },
 169         { "ro",                 MS_RDONLY       },
 170         { "relatime",           MS_RELATIME     },
 171         { "norelatime",         ~MS_RELATIME    },
 172         { "strictatime",        MS_STRICTATIME  },
 173         { "acl",                MS_POSIXACL     },
 174         { "noacl",              ~MS_POSIXACL    },
 175         { "nouser_xattr",       MS_NOUSER       },
 176         { "user_xattr",         ~MS_NOUSER      },
 177 };
 178
 179 static char *blobmsg_get_strdup(struct blob_attr *attr)
 180 {
 181         if (!attr)
 182                 return NULL;
 183
 184         return strdup(blobmsg_get_string(attr));
 185 }
 186
 187 static char *blobmsg_get_basename(struct blob_attr *attr)
 188 {
 189         if (!attr)
 190                 return NULL;
 191
 192         return strdup(basename(blobmsg_get_string(attr)));
 193 }
 194
 195 static void parse_mount_options(struct mount *m, char *optstr)
 196 {
 197         int i;
 198         bool is_flag;
 199         char *p, *opts, *last;
 200
 201         m->flags = 0;
 202         m->options = NULL;
 203
 204         if (!optstr || !*optstr)
 205                 return;
 206
 207         m->options = opts = calloc(1, strlen(optstr) + 1);
 208
 209         if (!m->options)
 210                 return;
 211
 212         p = last = optstr;
 213
 214         do {
 215                 p = strchr(p, ',');
 216
 217                 if (p)
 218                         *p++ = 0;
 219
 220                 for (i = 0, is_flag = false; i < ARRAY_SIZE(mount_flags); i++) {
 221                         if (!strcmp(last, mount_flags[i].name)) {
 222                                 if (mount_flags[i].flag < 0)
 223                                         m->flags &= (uint32_t)mount_flags[i].flag;
 224                                 else
 225                                         m->flags |= (uint32_t)mount_flags[i].flag;
 226                                 is_flag = true;
 227                                 break;
 228                         }
 229                 }
 230
 231                 if (!is_flag)
 232                         opts += sprintf(opts, "%s%s", (opts > m->options) ? "," : "", last);
 233
 234                 last = p;
 235
 236         } while (p);
 237
 238         free(optstr);
 239 }
 240
 241 static int mount_add(struct uci_section *s)
 242 {
 243         struct blob_attr *tb[__MOUNT_MAX] = { 0 };
 244         struct mount *m;
 245
 246         blob_buf_init(&b, 0);
 247         uci_to_blob(&b, s, &mount_attr_list);
 248         blobmsg_parse(mount_policy, __MOUNT_MAX, tb, blob_data(b.head), blob_len(b.head));
 249
 250         if (!tb[MOUNT_LABEL] && !tb[MOUNT_UUID] && !tb[MOUNT_DEVICE])
 251                 return -1;
 252
 253         if (tb[MOUNT_ENABLE] && !blobmsg_get_u32(tb[MOUNT_ENABLE]))
 254                 return -1;
 255
 256         m = malloc(sizeof(struct mount));
 257         m->type = TYPE_MOUNT;
 258         m->uuid = blobmsg_get_strdup(tb[MOUNT_UUID]);
 259         m->label = blobmsg_get_strdup(tb[MOUNT_LABEL]);
 260         m->target = blobmsg_get_strdup(tb[MOUNT_TARGET]);
 261         m->device = blobmsg_get_basename(tb[MOUNT_DEVICE]);
 262
 263         parse_mount_options(m, blobmsg_get_strdup(tb[MOUNT_OPTIONS]));
 264
 265         m->overlay = m->extroot = 0;
 266         if (m->target && !strcmp(m->target, "/"))
 267                 m->extroot = 1;
 268         if (m->target && !strcmp(m->target, "/overlay"))
 269                 m->extroot = m->overlay = 1;
 270
 271         if (m->target && *m->target != '/') {
 272                 ULOG_WARN("ignoring mount section %s due to invalid target '%s'\n",
 273                           s->e.name, m->target);
 274                 free(m);
 275                 return -1;
 276         }
 277
 278         if (m->uuid)
 279                 vlist_add(&mounts, &m->node, m->uuid);
 280         else if (m->label)
 281                 vlist_add(&mounts, &m->node, m->label);
 282         else if (m->device)
 283                 vlist_add(&mounts, &m->node, m->device);
 284
 285         return 0;
 286 }
 287
 288 static int swap_add(struct uci_section *s)
 289 {
 290         struct blob_attr *tb[__SWAP_MAX] = { 0 };
 291         struct mount *m;
 292
 293         blob_buf_init(&b, 0);
 294         uci_to_blob(&b, s, &swap_attr_list);
 295         blobmsg_parse(swap_policy, __SWAP_MAX, tb, blob_data(b.head), blob_len(b.head));
 296
 297         if (!tb[SWAP_UUID] && !tb[SWAP_LABEL] && !tb[SWAP_DEVICE])
 298                 return -1;
 299
 300         m = malloc(sizeof(struct mount));
 301         memset(m, 0, sizeof(struct mount));
 302         m->type = TYPE_SWAP;
 303         m->uuid = blobmsg_get_strdup(tb[SWAP_UUID]);
 304         m->label = blobmsg_get_strdup(tb[SWAP_LABEL]);
 305         m->device = blobmsg_get_basename(tb[SWAP_DEVICE]);
 306         if (tb[SWAP_PRIO])
 307                 m->prio = blobmsg_get_u32(tb[SWAP_PRIO]);
 308         if (m->prio)
 309                 m->prio = ((m->prio << SWAP_FLAG_PRIO_SHIFT) & SWAP_FLAG_PRIO_MASK) | SWAP_FLAG_PREFER;
 310
 311         if ((!tb[SWAP_ENABLE]) || blobmsg_get_u32(tb[SWAP_ENABLE])) {
 312                 /* store complete swap path */
 313                 if (tb[SWAP_DEVICE])
 314                         m->target = blobmsg_get_strdup(tb[SWAP_DEVICE]);
 315
 316                 if (m->uuid)
 317                         vlist_add(&mounts, &m->node, m->uuid);
 318                 else if (m->label)
 319                         vlist_add(&mounts, &m->node, m->label);
 320                 else if (m->device)
 321                         vlist_add(&mounts, &m->node, m->device);
 322         }
 323
 324         return 0;
 325 }
 326
 327 static int global_add(struct uci_section *s)
 328 {
 329         struct blob_attr *tb[__CFG_MAX] = { 0 };
 330
 331         blob_buf_init(&b, 0);
 332         uci_to_blob(&b, s, &config_attr_list);
 333         blobmsg_parse(config_policy, __CFG_MAX, tb, blob_data(b.head), blob_len(b.head));
 334
 335         if ((tb[CFG_ANON_MOUNT]) && blobmsg_get_u32(tb[CFG_ANON_MOUNT]))
 336                 anon_mount = 1;
 337         if ((tb[CFG_ANON_SWAP]) && blobmsg_get_u32(tb[CFG_ANON_SWAP]))
 338                 anon_swap = 1;
 339
 340         if ((tb[CFG_AUTO_MOUNT]) && blobmsg_get_u32(tb[CFG_AUTO_MOUNT]))
 341                 auto_mount = 1;
 342         if ((tb[CFG_AUTO_SWAP]) && blobmsg_get_u32(tb[CFG_AUTO_SWAP]))
 343                 auto_swap = 1;
 344
 345         if (tb[CFG_DELAY_ROOT])
 346                 delay_root = blobmsg_get_u32(tb[CFG_DELAY_ROOT]);
 347
 348         if ((tb[CFG_CHECK_FS]) && blobmsg_get_u32(tb[CFG_CHECK_FS]))
 349                 check_fs = 1;
 350
 351         return 0;
 352 }
 353
 354 static struct mount* find_swap(const char *uuid, const char *label, const char *device)
 355 {
 356         struct mount *m;
 357
 358         vlist_for_each_element(&mounts, m, node) {
 359                 if (m->type != TYPE_SWAP)
 360                         continue;
 361                 if (uuid && m->uuid && !strcasecmp(m->uuid, uuid))
 362                         return m;
 363                 if (label && m->label && !strcmp(m->label, label))
 364                         return m;
 365                 if (device && m->device && !strcmp(m->device, device))
 366                         return m;
 367         }
 368
 369         return NULL;
 370 }
 371
 372 static struct mount* find_block(const char *uuid, const char *label, const char *device,
 373                                 const char *target)
 374 {
 375         struct mount *m;
 376
 377         vlist_for_each_element(&mounts, m, node) {
 378                 if (m->type != TYPE_MOUNT)
 379                         continue;
 380                 if (m->uuid && uuid && !strcasecmp(m->uuid, uuid))
 381                         return m;
 382                 if (m->label && label && !strcmp(m->label, label))
 383                         return m;
 384                 if (m->target && target && !strcmp(m->target, target))
 385                         return m;
 386                 if (m->device && device && !strcmp(m->device, device))
 387                         return m;
 388         }
 389
 390         return NULL;
 391 }
 392
 393 static void mounts_update(struct vlist_tree *tree, struct vlist_node *node_new,
 394                           struct vlist_node *node_old)
 395 {
 396 }
 397
 398 static struct uci_package * config_try_load(struct uci_context *ctx, char *path)
 399 {
 400         char *file = basename(path);
 401         char *dir = dirname(path);
 402         char *err;
 403         struct uci_package *pkg;
 404
 405         uci_set_confdir(ctx, dir);
 406         ULOG_INFO("attempting to load %s/%s\n", dir, file);
 407
 408         if (uci_load(ctx, file, &pkg)) {
 409                 uci_get_errorstr(ctx, &err, file);
 410                 ULOG_ERR("unable to load configuration (%s)\n", err);
 411
 412                 free(err);
 413                 return NULL;
 414         }
 415
 416         return pkg;
 417 }
 418
 419 static int config_load(char *cfg)
 420 {
 421         struct uci_context *ctx = uci_alloc_context();
 422         struct uci_package *pkg = NULL;
 423         struct uci_element *e;
 424         char path[64];
 425
 426         vlist_init(&mounts, avl_strcmp, mounts_update);
 427
 428         if (cfg) {
 429                 snprintf(path, sizeof(path), "%s/upper/etc/config/fstab", cfg);
 430                 pkg = config_try_load(ctx, path);
 431
 432                 if (!pkg) {
 433                         snprintf(path, sizeof(path), "%s/etc/config/fstab", cfg);
 434                         pkg = config_try_load(ctx, path);
 435                 }
 436         }
 437
 438         if (!pkg) {
 439                 snprintf(path, sizeof(path), "/etc/config/fstab");
 440                 pkg = config_try_load(ctx, path);
 441         }
 442
 443         if (!pkg) {
 444                 ULOG_ERR("no usable configuration\n");
 445                 return -1;
 446         }
 447
 448         vlist_update(&mounts);
 449         uci_foreach_element(&pkg->sections, e) {
 450                 struct uci_section *s = uci_to_section(e);
 451
 452                 if (!strcmp(s->type, "mount"))
 453                         mount_add(s);
 454                 if (!strcmp(s->type, "swap"))
 455                         swap_add(s);
 456                 if (!strcmp(s->type, "global"))
 457                         global_add(s);
 458         }
 459         vlist_flush(&mounts);
 460
 461         return 0;
 462 }
 463
 464 static struct blkid_struct_probe* _probe_path(char *path)
 465 {
 466         struct blkid_struct_probe *pr;
 467         char tmppath[64];
 468
 469         /* skip ubi device if ubiblock device is present */
 470         if (path[5] == 'u' && path[6] == 'b' && path[7] == 'i' &&
 471             path[8] >= '0' && path[8] <= '9' ) {
 472                 snprintf(tmppath, sizeof(tmppath), "/dev/ubiblock%s", path + 8);
 473                 list_for_each_entry(pr, &devices, list)
 474                         if (!strcasecmp(pr->dev, tmppath))
 475                                 return NULL;
 476         }
 477
 478         pr = malloc(sizeof(*pr));
 479
 480         if (!pr)
 481                 return NULL;
 482
 483         memset(pr, 0, sizeof(*pr));
 484         probe_block(path, pr);
 485
 486         if (pr->err || !pr->id) {
 487                 free(pr);
 488                 return NULL;
 489         }
 490
 491         return pr;
 492 }
 493
 494 static int _cache_load(const char *path)
 495 {
 496         int gl_flags = GLOB_NOESCAPE | GLOB_MARK;
 497         int j;
 498         glob_t gl;
 499
 500         if (glob(path, gl_flags, NULL, &gl) < 0)
 501                 return -1;
 502
 503         for (j = 0; j < gl.gl_pathc; j++) {
 504                 struct blkid_struct_probe *pr = _probe_path(gl.gl_pathv[j]);
 505                 if (pr)
 506                         list_add_tail(&pr->list, &devices);
 507         }
 508
 509         globfree(&gl);
 510
 511         return 0;
 512 }
 513
 514 static void cache_load(int mtd)
 515 {
 516         if (mtd) {
 517                 _cache_load("/dev/mtdblock*");
 518                 _cache_load("/dev/ubiblock*");
 519                 _cache_load("/dev/ubi[0-9]*");
 520         }
 521         _cache_load("/dev/mmcblk*");
 522         _cache_load("/dev/sd*");
 523         _cache_load("/dev/hd*");
 524         _cache_load("/dev/md*");
 525         _cache_load("/dev/vd*");
 526         _cache_load("/dev/mapper/*");
 527 }
 528
 529 static int print_block_info(struct blkid_struct_probe *pr)
 530 {
 531         printf("%s:", pr->dev);
 532         if (pr->uuid[0])
 533                 printf(" UUID=\"%s\"", pr->uuid);
 534
 535         if (pr->label[0])
 536                 printf(" LABEL=\"%s\"", pr->label);
 537
 538         if (pr->name[0])
 539                 printf(" NAME=\"%s\"", pr->name);
 540
 541         if (pr->version[0])
 542                 printf(" VERSION=\"%s\"", pr->version);
 543
 544         printf(" TYPE=\"%s\"\n", pr->id->name);
 545
 546         return 0;
 547 }
 548
 549 static int print_block_uci(struct blkid_struct_probe *pr)
 550 {
 551         if (!strcmp(pr->id->name, "swap")) {
 552                 printf("config 'swap'\n");
 553         } else {
 554                 printf("config 'mount'\n");
 555                 printf("\toption\ttarget\t'/mnt/%s'\n", basename(pr->dev));
 556         }
 557         if (pr->uuid[0])
 558                 printf("\toption\tuuid\t'%s'\n", pr->uuid);
 559         else
 560                 printf("\toption\tdevice\t'%s'\n", pr->dev);
 561         printf("\toption\tenabled\t'0'\n\n");
 562
 563         return 0;
 564 }
 565
 566 static struct blkid_struct_probe* find_block_info(char *uuid, char *label, char *path)
 567 {
 568         struct blkid_struct_probe *pr = NULL;
 569
 570         if (uuid)
 571                 list_for_each_entry(pr, &devices, list)
 572                         if (!strcasecmp(pr->uuid, uuid))
 573                                 return pr;
 574
 575         if (label)
 576                 list_for_each_entry(pr, &devices, list)
 577                         if (!strcmp(pr->label, label))
 578                                 return pr;
 579
 580         if (path)
 581                 list_for_each_entry(pr, &devices, list)
 582                         if (!strcmp(basename(pr->dev), basename(path)))
 583                                 return pr;
 584
 585         return NULL;
 586 }
 587
 588 static char* find_mount_point(char *block)
 589 {
 590         FILE *fp = fopen("/proc/mounts", "r");
 591         static char line[256];
 592         int len = strlen(block);
 593         char *point = NULL;
 594
 595         if(!fp)
 596                 return NULL;
 597
 598         while (fgets(line, sizeof(line), fp)) {
 599                 if (!strncmp(line, block, len)) {
 600                         char *p = &line[len + 1];
 601                         char *t = strstr(p, " ");
 602
 603                         if (!t) {
 604                                 fclose(fp);
 605                                 return NULL;
 606                         }
 607                         *t = '\0';
 608                         point = p;
 609                         break;
 610                 }
 611         }
 612
 613         fclose(fp);
 614
 615         return point;
 616 }
 617
 618 static void mkdir_p(char *dir)
 619 {
 620         char *l = strrchr(dir, '/');
 621
 622         if (l) {
 623                 *l = '\0';
 624                 mkdir_p(dir);
 625                 *l = '/';
 626                 mkdir(dir, 0755);
 627         }
 628 }
 629
 630 static void check_filesystem(struct blkid_struct_probe *pr)
 631 {
 632         pid_t pid;
 633         struct stat statbuf;
 634         const char *e2fsck = "/usr/sbin/e2fsck";
 635         const char *dosfsck = "/usr/sbin/dosfsck";
 636         const char *ckfs;
 637
 638         /* UBIFS does not need stuff like fsck */
 639         if (!strncmp(pr->id->name, "ubifs", 5))
 640                 return;
 641
 642         if (!strncmp(pr->id->name, "vfat", 4)) {
 643                 ckfs = dosfsck;
 644         } else if (!strncmp(pr->id->name, "ext", 3)) {
 645                 ckfs = e2fsck;
 646         } else {
 647                 ULOG_ERR("check_filesystem: %s is not supported\n", pr->id->name);
 648                 return;
 649         }
 650
 651         if (stat(ckfs, &statbuf) < 0) {
 652                 ULOG_ERR("check_filesystem: %s not found\n", ckfs);
 653                 return;
 654         }
 655
 656         pid = fork();
 657         if (!pid) {
 658                 execl(ckfs, ckfs, "-p", pr->dev, NULL);
 659                 exit(-1);
 660         } else if (pid > 0) {
 661                 int status;
 662
 663                 waitpid(pid, &status, 0);
 664                 if (WEXITSTATUS(status))
 665                         ULOG_ERR("check_filesystem: %s returned %d\n", ckfs, WEXITSTATUS(status));
 666         }
 667 }
 668
 669 static void handle_swapfiles(bool on)
 670 {
 671         struct stat s;
 672         struct mount *m;
 673         struct blkid_struct_probe *pr;
 674
 675         vlist_for_each_element(&mounts, m, node)
 676         {
 677                 if (m->type != TYPE_SWAP || !m->target)
 678                         continue;
 679
 680                 if (stat(m->target, &s) || !S_ISREG(s.st_mode))
 681                         continue;
 682
 683                 pr = _probe_path(m->target);
 684
 685                 if (!pr)
 686                         continue;
 687
 688                 if (!strcmp(pr->id->name, "swap")) {
 689                         if (on)
 690                                 swapon(pr->dev, m->prio);
 691                         else
 692                                 swapoff(pr->dev);
 693                 }
 694
 695                 free(pr);
 696         }
 697 }
 698
 699 static int mount_device(struct blkid_struct_probe *pr, int hotplug)
 700 {
 701         struct mount *m;
 702         char *device;
 703
 704         if (!pr)
 705                 return -1;
 706
 707         device = basename(pr->dev);
 708
 709         if (!strcmp(pr->id->name, "swap")) {
 710                 if (hotplug && !auto_swap)
 711                         return -1;
 712                 m = find_swap(pr->uuid, pr->label, device);
 713                 if (m || anon_swap)
 714                         swapon(pr->dev, (m) ? (m->prio) : (0));
 715
 716                 return 0;
 717         }
 718
 719         if (hotplug && !auto_mount)
 720                 return -1;
 721
 722         if (find_mount_point(pr->dev)) {
 723                 ULOG_ERR("%s is already mounted\n", pr->dev);
 724                 return -1;
 725         }
 726
 727         m = find_block(pr->uuid, pr->label, device, NULL);
 728         if (m && m->extroot)
 729                 return -1;
 730
 731         if (m) {
 732                 char *target = m->target;
 733                 char _target[32];
 734                 int err = 0;
 735
 736                 if (!target) {
 737                         snprintf(_target, sizeof(_target), "/mnt/%s", device);
 738                         target = _target;
 739                 }
 740                 mkdir_p(target);
 741
 742                 if (check_fs)
 743                         check_filesystem(pr);
 744
 745                 err = mount(pr->dev, target, pr->id->name, m->flags,
 746                             (m->options) ? (m->options) : (""));
 747                 if (err)
 748                         ULOG_ERR("mounting %s (%s) as %s failed (%d) - %s\n",
 749                                  pr->dev, pr->id->name, target, err, strerror(err));
 750                 else
 751                         handle_swapfiles(true);
 752                 return err;
 753         }
 754
 755         if (anon_mount) {
 756                 char target[] = "/mnt/mmcblk123";
 757                 int err = 0;
 758
 759                 snprintf(target, sizeof(target), "/mnt/%s", device);
 760                 mkdir_p(target);
 761
 762                 if (check_fs)
 763                         check_filesystem(pr);
 764
 765                 err = mount(pr->dev, target, pr->id->name, 0, "");
 766                 if (err)
 767                         ULOG_ERR("mounting %s (%s) as %s failed (%d) - %s\n",
 768                                  pr->dev, pr->id->name, target, err, strerror(err));
 769                 else
 770                         handle_swapfiles(true);
 771                 return err;
 772         }
 773
 774         return 0;
 775 }
 776
 777 static int umount_device(struct blkid_struct_probe *pr)
 778 {
 779         struct mount *m;
 780         char *device = basename(pr->dev);
 781         char *mp;
 782         int err;
 783
 784         if (!pr)
 785                 return -1;
 786
 787         if (!strcmp(pr->id->name, "swap"))
 788                 return -1;
 789
 790         mp = find_mount_point(pr->dev);
 791         if (!mp)
 792                 return -1;
 793
 794         m = find_block(pr->uuid, pr->label, device, NULL);
 795         if (m && m->extroot)
 796                 return -1;
 797
 798         err = umount2(mp, MNT_DETACH);
 799         if (err)
 800                 ULOG_ERR("unmounting %s (%s)  failed (%d) - %s\n",
 801                          pr->dev, mp, err, strerror(err));
 802         else
 803                 ULOG_INFO("unmounted %s (%s)\n",
 804                           pr->dev, mp);
 805
 806         return err;
 807 }
 808
 809 static int main_hotplug(int argc, char **argv)
 810 {
 811         char path[32];
 812         char *action, *device, *mount_point;
 813
 814         action = getenv("ACTION");
 815         device = getenv("DEVNAME");
 816
 817         if (!action || !device)
 818                 return -1;
 819         snprintf(path, sizeof(path), "/dev/%s", device);
 820
 821         if (!strcmp(action, "remove")) {
 822                 int err = 0;
 823                 mount_point = find_mount_point(path);
 824                 if (mount_point)
 825                         err = umount2(mount_point, MNT_DETACH);
 826
 827                 if (err)
 828                         ULOG_ERR("umount of %s failed (%d) - %s\n",
 829                                  mount_point, err, strerror(err));
 830
 831                 return 0;
 832         } else if (strcmp(action, "add")) {
 833                 ULOG_ERR("Unkown action %s\n", action);
 834
 835                 return -1;
 836         }
 837
 838         if (config_load(NULL))
 839                 return -1;
 840         cache_load(0);
 841
 842         return mount_device(find_block_info(NULL, NULL, path), 1);
 843 }
 844
 845 static int find_block_mtd(char *name, char *part, int plen)
 846 {
 847         FILE *fp = fopen("/proc/mtd", "r");
 848         static char line[256];
 849         char *index = NULL;
 850
 851         if(!fp)
 852                 return -1;
 853
 854         while (!index && fgets(line, sizeof(line), fp)) {
 855                 if (strstr(line, name)) {
 856                         char *eol = strstr(line, ":");
 857
 858                         if (!eol)
 859                                 continue;
 860
 861                         *eol = '\0';
 862                         index = &line[3];
 863                 }
 864         }
 865
 866         fclose(fp);
 867
 868         if (!index)
 869                 return -1;
 870
 871         snprintf(part, plen, "/dev/mtdblock%s", index);
 872
 873         return 0;
 874 }
 875
 876 #ifdef UBIFS_EXTROOT
 877 static int find_ubi_vol(libubi_t libubi, char *name, int *dev_num, int *vol_id)
 878 {
 879         int dev = 0;
 880
 881         while (ubi_dev_present(libubi, dev))
 882         {
 883                 struct ubi_dev_info dev_info;
 884                 struct ubi_vol_info vol_info;
 885
 886                 if (ubi_get_dev_info1(libubi, dev++, &dev_info))
 887                         continue;
 888                 if (ubi_get_vol_info1_nm(libubi, dev_info.dev_num, name, &vol_info))
 889                         continue;
 890
 891                 *dev_num = dev_info.dev_num;
 892                 *vol_id = vol_info.vol_id;
 893
 894                 return 0;
 895         }
 896
 897         return -1;
 898 }
 899
 900 static int find_block_ubi(libubi_t libubi, char *name, char *part, int plen)
 901 {
 902         int dev_num;
 903         int vol_id;
 904         int err = -1;
 905
 906         err = find_ubi_vol(libubi, name, &dev_num, &vol_id);
 907         if (!err)
 908                 snprintf(part, plen, "/dev/ubi%d_%d", dev_num, vol_id);
 909
 910         return err;
 911 }
 912
 913 static int find_block_ubi_RO(libubi_t libubi, char *name, char *part, int plen)
 914 {
 915         int dev_num;
 916         int vol_id;
 917         int err = -1;
 918
 919         err = find_ubi_vol(libubi, name, &dev_num, &vol_id);
 920         if (!err)
 921                 snprintf(part, plen, "/dev/ubiblock%d_%d", dev_num, vol_id);
 922
 923         return err;
 924 }
 925
 926 #else
 927
 928 static int find_root_dev(char *buf, int len)
 929 {
 930         DIR *d;
 931         dev_t root;
 932         struct stat s;
 933         struct dirent *e;
 934
 935         if (stat("/", &s))
 936                 return -1;
 937
 938         if (!(d = opendir("/dev")))
 939                 return -1;
 940
 941         root = s.st_dev;
 942
 943         while ((e = readdir(d)) != NULL) {
 944                 snprintf(buf, len, "/dev/%s", e->d_name);
 945
 946                 if (stat(buf, &s) || s.st_rdev != root)
 947                         continue;
 948
 949                 closedir(d);
 950                 return 0;
 951         }
 952
 953         closedir(d);
 954         return -1;
 955 }
 956
 957 #endif
 958
 959 static int test_fs_support(const char *name)
 960 {
 961         char line[128], *p;
 962         int rv = -1;
 963         FILE *f;
 964
 965         if ((f = fopen("/proc/filesystems", "r")) != NULL) {
 966                 while (fgets(line, sizeof(line), f)) {
 967                         p = strtok(line, "\t\n");
 968
 969                         if (p && !strcmp(p, "nodev"))
 970                                 p = strtok(NULL, "\t\n");
 971
 972                         if (p && !strcmp(p, name)) {
 973                                 rv = 0;
 974                                 break;
 975                         }
 976                 }
 977                 fclose(f);
 978         }
 979
 980         return rv;
 981 }
 982
 983 static int check_extroot(char *path)
 984 {
 985         struct blkid_struct_probe *pr = NULL;
 986         char devpath[32];
 987
 988 #ifdef UBIFS_EXTROOT
 989         if (find_block_mtd("\"rootfs\"", devpath, sizeof(devpath))) {
 990                 int err = -1;
 991                 libubi_t libubi;
 992
 993                 libubi = libubi_open();
 994                 err = find_block_ubi_RO(libubi, "rootfs", devpath, sizeof(devpath));
 995                 libubi_close(libubi);
 996                 if (err)
 997                         return -1;
 998         }
 999 #else
1000         if (find_block_mtd("\"rootfs\"", devpath, sizeof(devpath))) {
1001                 if (find_root_dev(devpath, sizeof(devpath))) {
1002                         ULOG_ERR("extroot: unable to determine root device\n");
1003                         return -1;
1004                 }
1005         }
1006 #endif
1007
1008         list_for_each_entry(pr, &devices, list) {
1009                 if (!strcmp(pr->dev, devpath)) {
1010                         struct stat s;
1011                         FILE *fp = NULL;
1012                         char tag[64];
1013                         char uuid[64] = { 0 };
1014
1015                         snprintf(tag, sizeof(tag), "%s/etc", path);
1016                         if (stat(tag, &s))
1017                                 mkdir_p(tag);
1018
1019                         snprintf(tag, sizeof(tag), "%s/etc/.extroot-uuid", path);
1020                         if (stat(tag, &s)) {
1021                                 fp = fopen(tag, "w+");
1022                                 if (!fp) {
1023                                         ULOG_ERR("extroot: failed to write UUID to %s: %d (%s)\n",
1024                                                  tag, errno, strerror(errno));
1025                                         /* return 0 to continue boot regardless of error */
1026                                         return 0;
1027                                 }
1028                                 fputs(pr->uuid, fp);
1029                                 fclose(fp);
1030                                 return 0;
1031                         }
1032
1033                         fp = fopen(tag, "r");
1034                         if (!fp) {
1035                                 ULOG_ERR("extroot: failed to read UUID from %s: %d (%s)\n",
1036                                          tag, errno, strerror(errno));
1037                                 return -1;
1038                         }
1039
1040                         if (!fgets(uuid, sizeof(uuid), fp))
1041                                 ULOG_ERR("extroot: failed to read UUID from %s: %d (%s)\n",
1042                                          tag, errno, strerror(errno));
1043                         fclose(fp);
1044
1045                         if (*uuid || !strcasecmp(uuid, pr->uuid))
1046                                 return 0;
1047
1048                         ULOG_ERR("extroot: UUID mismatch (root: %s, %s: %s)\n",
1049                                  pr->uuid, basename(path), uuid);
1050                         return -1;
1051                 }
1052         }
1053
1054         ULOG_ERR("extroot: unable to lookup root device %s\n", devpath);
1055         return -1;
1056 }
1057
1058 /*
1059  * Read info about extroot from UCI (using prefix) and mount it.
1060  */
1061 static int mount_extroot(char *cfg)
1062 {
1063         char overlay[] = "/tmp/extroot/overlay";
1064         char mnt[] = "/tmp/extroot/mnt";
1065         char *path = mnt;
1066         struct blkid_struct_probe *pr;
1067         struct mount *m;
1068         int err = -1;
1069
1070         /* Load @cfg/etc/config/fstab */
1071         if (config_load(cfg))
1072                 return -2;
1073
1074         /* See if there is extroot-specific mount config */
1075         m = find_block(NULL, NULL, NULL, "/");
1076         if (!m)
1077                 m = find_block(NULL, NULL, NULL, "/overlay");
1078
1079         if (!m || !m->extroot)
1080         {
1081                 ULOG_INFO("extroot: not configured\n");
1082                 return -1;
1083         }
1084
1085         /* Find block device pointed by the mount config */
1086         pr = find_block_info(m->uuid, m->label, m->device);
1087
1088         if (!pr && delay_root){
1089                 ULOG_INFO("extroot: device not present, retrying in %u seconds\n", delay_root);
1090                 sleep(delay_root);
1091                 mkblkdev();
1092                 cache_load(0);
1093                 pr = find_block_info(m->uuid, m->label, m->device);
1094         }
1095         if (pr) {
1096                 if (strncmp(pr->id->name, "ext", 3) &&
1097                     strncmp(pr->id->name, "ubifs", 5)) {
1098                         ULOG_ERR("extroot: unsupported filesystem %s, try ext4\n", pr->id->name);
1099                         return -1;
1100                 }
1101
1102                 if (test_fs_support(pr->id->name)) {
1103                         ULOG_ERR("extroot: filesystem %s not supported by kernel\n", pr->id->name);
1104                         return -1;
1105                 }
1106
1107                 if (m->overlay)
1108                         path = overlay;
1109                 mkdir_p(path);
1110
1111                 if (check_fs)
1112                         check_filesystem(pr);
1113
1114                 err = mount(pr->dev, path, pr->id->name, m->flags,
1115                             (m->options) ? (m->options) : (""));
1116
1117                 if (err) {
1118                         ULOG_ERR("extroot: mounting %s (%s) on %s failed: %d (%s)\n",
1119                                  pr->dev, pr->id->name, path, err, strerror(err));
1120                 } else if (m->overlay) {
1121                         err = check_extroot(path);
1122                         if (err)
1123                                 umount(path);
1124                 }
1125         } else {
1126                 ULOG_ERR("extroot: cannot find device %s%s\n",
1127                          (m->uuid ? "with UUID " : (m->label ? "with label " : "")),
1128                          (m->uuid ? m->uuid : (m->label ? m->label : m->device)));
1129         }
1130
1131         return err;
1132 }
1133
1134 static int main_extroot(int argc, char **argv)
1135 {
1136         struct blkid_struct_probe *pr;
1137         char blkdev_path[32] = { 0 };
1138         int err = -1;
1139 #ifdef UBIFS_EXTROOT
1140         libubi_t libubi;
1141 #endif
1142
1143         if (!getenv("PREINIT"))
1144                 return -1;
1145
1146         if (argc != 2) {
1147                 ULOG_ERR("Usage: block extroot\n");
1148                 return -1;
1149         }
1150
1151         mkblkdev();
1152         cache_load(1);
1153
1154         /* enable LOG_INFO messages */
1155         ulog_threshold(LOG_INFO);
1156
1157         /*
1158          * Look for "rootfs_data". We will want to mount it and check for
1159          * extroot configuration.
1160          */
1161
1162         /* Start with looking for MTD partition */
1163         find_block_mtd("\"rootfs_data\"", blkdev_path, sizeof(blkdev_path));
1164         if (blkdev_path[0]) {
1165                 pr = find_block_info(NULL, NULL, blkdev_path);
1166                 if (pr && !strcmp(pr->id->name, "jffs2")) {
1167                         char cfg[] = "/tmp/jffs_cfg";
1168
1169                         /*
1170                          * Mount MTD part and try extroot (using
1171                          * /etc/config/fstab from that partition)
1172                          */
1173                         mkdir_p(cfg);
1174                         if (!mount(blkdev_path, cfg, "jffs2", MS_NOATIME, NULL)) {
1175                                 err = mount_extroot(cfg);
1176                                 umount2(cfg, MNT_DETACH);
1177                         }
1178                         if (err < 0)
1179                                 rmdir("/tmp/overlay");
1180                         rmdir(cfg);
1181                         return err;
1182                 }
1183         }
1184
1185 #ifdef UBIFS_EXTROOT
1186         /* ... but it also could be an UBI volume */
1187         memset(blkdev_path, 0, sizeof(blkdev_path));
1188         libubi = libubi_open();
1189         find_block_ubi(libubi, "rootfs_data", blkdev_path, sizeof(blkdev_path));
1190         libubi_close(libubi);
1191         if (blkdev_path[0]) {
1192                 char cfg[] = "/tmp/ubifs_cfg";
1193
1194                 /* Mount volume and try extroot (using fstab from that vol) */
1195                 mkdir_p(cfg);
1196                 if (!mount(blkdev_path, cfg, "ubifs", MS_NOATIME, NULL)) {
1197                         err = mount_extroot(cfg);
1198                         umount2(cfg, MNT_DETACH);
1199                 }
1200                 if (err < 0)
1201                         rmdir("/tmp/overlay");
1202                 rmdir(cfg);
1203                 return err;
1204        }
1205 #endif
1206
1207         return mount_extroot(NULL);
1208 }
1209
1210 static int main_mount(int argc, char **argv)
1211 {
1212         struct blkid_struct_probe *pr;
1213
1214         if (config_load(NULL))
1215                 return -1;
1216
1217         cache_load(1);
1218         list_for_each_entry(pr, &devices, list)
1219                 mount_device(pr, 0);
1220
1221         handle_swapfiles(true);
1222
1223         return 0;
1224 }
1225
1226 static int main_umount(int argc, char **argv)
1227 {
1228         struct blkid_struct_probe *pr;
1229
1230         if (config_load(NULL))
1231                 return -1;
1232
1233         handle_swapfiles(false);
1234
1235         cache_load(0);
1236         list_for_each_entry(pr, &devices, list)
1237                 umount_device(pr);
1238
1239         return 0;
1240 }
1241
1242 static int main_detect(int argc, char **argv)
1243 {
1244         struct blkid_struct_probe *pr;
1245
1246         cache_load(0);
1247         printf("config 'global'\n");
1248         printf("\toption\tanon_swap\t'0'\n");
1249         printf("\toption\tanon_mount\t'0'\n");
1250         printf("\toption\tauto_swap\t'1'\n");
1251         printf("\toption\tauto_mount\t'1'\n");
1252         printf("\toption\tdelay_root\t'5'\n");
1253         printf("\toption\tcheck_fs\t'0'\n\n");
1254         list_for_each_entry(pr, &devices, list)
1255                 print_block_uci(pr);
1256
1257         return 0;
1258 }
1259
1260 static int main_info(int argc, char **argv)
1261 {
1262         int i;
1263         struct blkid_struct_probe *pr;
1264
1265         cache_load(1);
1266         if (argc == 2) {
1267                 list_for_each_entry(pr, &devices, list)
1268                         print_block_info(pr);
1269
1270                 return 0;
1271         };
1272
1273         for (i = 2; i < argc; i++) {
1274                 struct stat s;
1275
1276                 if (stat(argv[i], &s)) {
1277                         ULOG_ERR("failed to stat %s\n", argv[i]);
1278                         continue;
1279                 }
1280                 if (!S_ISBLK(s.st_mode)) {
1281                         ULOG_ERR("%s is not a block device\n", argv[i]);
1282                         continue;
1283                 }
1284                 pr = find_block_info(NULL, NULL, argv[i]);
1285                 if (pr)
1286                         print_block_info(pr);
1287         }
1288
1289         return 0;
1290 }
1291
1292 static int swapon_usage(void)
1293 {
1294         fprintf(stderr, "Usage: swapon [-s] [-a] [[-p pri] DEVICE]\n\n"
1295                 "\tStart swapping on [DEVICE]\n"
1296                 " -a\tStart swapping on all swap devices\n"
1297                 " -p pri\tSet priority of swap device\n"
1298                 " -s\tShow summary\n");
1299         return -1;
1300 }
1301
1302 static int main_swapon(int argc, char **argv)
1303 {
1304         int ch;
1305         FILE *fp;
1306         char *lineptr;
1307         size_t s;
1308         struct blkid_struct_probe *pr;
1309         int flags = 0;
1310         int pri;
1311         struct stat st;
1312         int err;
1313
1314         while ((ch = getopt(argc, argv, "ap:s")) != -1) {
1315                 switch(ch) {
1316                 case 's':
1317                         fp = fopen("/proc/swaps", "r");
1318                         lineptr = NULL;
1319
1320                         if (!fp) {
1321                                 ULOG_ERR("failed to open /proc/swaps\n");
1322                                 return -1;
1323                         }
1324                         while (getline(&lineptr, &s, fp) > 0)
1325                                 printf("%s", lineptr);
1326                         if (lineptr)
1327                                 free(lineptr);
1328                         fclose(fp);
1329                         return 0;
1330                 case 'a':
1331                         cache_load(0);
1332                         list_for_each_entry(pr, &devices, list) {
1333                                 if (strcmp(pr->id->name, "swap"))
1334                                         continue;
1335                                 if (swapon(pr->dev, 0))
1336                                         ULOG_ERR("failed to swapon %s\n", pr->dev);
1337                         }
1338                         return 0;
1339                 case 'p':
1340                         pri = atoi(optarg);
1341                         if (pri >= 0)
1342                                 flags = ((pri << SWAP_FLAG_PRIO_SHIFT) & SWAP_FLAG_PRIO_MASK) | SWAP_FLAG_PREFER;
1343                         break;
1344                 default:
1345                         return swapon_usage();
1346                 }
1347
1348         }
1349
1350         if (optind != (argc - 1))
1351                 return swapon_usage();
1352
1353         if (stat(argv[optind], &st) || (!S_ISBLK(st.st_mode) && !S_ISREG(st.st_mode))) {
1354                 ULOG_ERR("%s is not a block device or file\n", argv[optind]);
1355                 return -1;
1356         }
1357         err = swapon(argv[optind], flags);
1358         if (err) {
1359                 ULOG_ERR("failed to swapon %s (%d)\n", argv[optind], err);
1360                 return err;
1361         }
1362
1363         return 0;
1364 }
1365
1366 static int main_swapoff(int argc, char **argv)
1367 {
1368         if (argc != 2) {
1369                 ULOG_ERR("Usage: swapoff [-a] [DEVICE]\n\n"
1370                         "\tStop swapping on DEVICE\n"
1371                         " -a\tStop swapping on all swap devices\n");
1372                 return -1;
1373         }
1374
1375         if (!strcmp(argv[1], "-a")) {
1376                 FILE *fp = fopen("/proc/swaps", "r");
1377                 char line[256];
1378
1379                 if (!fp) {
1380                         ULOG_ERR("failed to open /proc/swaps\n");
1381                         return -1;
1382                 }
1383                 if (fgets(line, sizeof(line), fp))
1384                         while (fgets(line, sizeof(line), fp)) {
1385                                 char *end = strchr(line, ' ');
1386                                 int err;
1387
1388                                 if (!end)
1389                                         continue;
1390                                 *end = '\0';
1391                                 err = swapoff(line);
1392                                 if (err)
1393                                         ULOG_ERR("failed to swapoff %s (%d)\n", line, err);
1394                         }
1395                 fclose(fp);
1396         } else {
1397                 struct stat s;
1398                 int err;
1399
1400                 if (stat(argv[1], &s) || (!S_ISBLK(s.st_mode) && !S_ISREG(s.st_mode))) {
1401                         ULOG_ERR("%s is not a block device or file\n", argv[1]);
1402                         return -1;
1403                 }
1404                 err = swapoff(argv[1]);
1405                 if (err) {
1406                         ULOG_ERR("failed to swapoff %s (%d)\n", argv[1], err);
1407                         return err;
1408                 }
1409         }
1410
1411         return 0;
1412 }
1413
1414 int main(int argc, char **argv)
1415 {
1416         char *base = basename(*argv);
1417
1418         umask(0);
1419
1420         ulog_open(-1, -1, "block");
1421         ulog_threshold(LOG_NOTICE);
1422
1423         if (!strcmp(base, "swapon"))
1424                 return main_swapon(argc, argv);
1425
1426         if (!strcmp(base, "swapoff"))
1427                 return main_swapoff(argc, argv);
1428
1429         if ((argc > 1) && !strcmp(base, "block")) {
1430                 if (!strcmp(argv[1], "info"))
1431                         return main_info(argc, argv);
1432
1433                 if (!strcmp(argv[1], "detect"))
1434                         return main_detect(argc, argv);
1435
1436                 if (!strcmp(argv[1], "hotplug"))
1437                         return main_hotplug(argc, argv);
1438
1439                 if (!strcmp(argv[1], "extroot"))
1440                         return main_extroot(argc, argv);
1441
1442                 if (!strcmp(argv[1], "mount"))
1443                         return main_mount(argc, argv);
1444
1445                 if (!strcmp(argv[1], "umount"))
1446                         return main_umount(argc, argv);
1447
1448                 if (!strcmp(argv[1], "remount")) {
1449                         int ret = main_umount(argc, argv);
1450
1451                         if (!ret)
1452                                 ret = main_mount(argc, argv);
1453                         return ret;
1454                 }
1455         }
1456
1457         ULOG_ERR("Usage: block <info|mount|umount|detect>\n");
1458
1459         return -1;
1460 }