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 <stdio.h>
  17 #include <unistd.h>
  18 #include <syslog.h>
  19 #include <libgen.h>
  20 #include <glob.h>
  21
  22 #include <sys/stat.h>
  23 #include <sys/types.h>
  24 #include <sys/swap.h>
  25 #include <sys/mount.h>
  26 #include <sys/wait.h>
  27
  28 #include <uci.h>
  29 #include <uci_blob.h>
  30
  31 #include <libubox/list.h>
  32 #include <libubox/vlist.h>
  33 #include <libubox/blobmsg_json.h>
  34 #include <libubox/avl-cmp.h>
  35
  36 #include "libblkid-tiny/libblkid-tiny.h"
  37
  38 enum {
  39         TYPE_MOUNT,
  40         TYPE_SWAP,
  41 };
  42
  43 struct mount {
  44         struct vlist_node node;
  45         int type;
  46
  47         char *target;
  48         char *path;
  49         char *options;
  50         uint32_t flags;
  51         char *uuid;
  52         char *label;
  53         char *device;
  54         int extroot;
  55         int overlay;
  56         int disabled_fsck;
  57         unsigned int prio;
  58 };
  59
  60 static struct vlist_tree mounts;
  61 static struct blob_buf b;
  62 static LIST_HEAD(devices);
  63 static int anon_mount, anon_swap, auto_mount, auto_swap, check_fs;
  64 static unsigned int delay_root;
  65
  66 enum {
  67         CFG_ANON_MOUNT,
  68         CFG_ANON_SWAP,
  69         CFG_AUTO_MOUNT,
  70         CFG_AUTO_SWAP,
  71         CFG_DELAY_ROOT,
  72         CFG_CHECK_FS,
  73         __CFG_MAX
  74 };
  75
  76 static const struct blobmsg_policy config_policy[__CFG_MAX] = {
  77         [CFG_ANON_SWAP] = { .name = "anon_swap", .type = BLOBMSG_TYPE_INT32 },
  78         [CFG_ANON_MOUNT] = { .name = "anon_mount", .type = BLOBMSG_TYPE_INT32 },
  79         [CFG_AUTO_SWAP] = { .name = "auto_swap", .type = BLOBMSG_TYPE_INT32 },
  80         [CFG_AUTO_MOUNT] = { .name = "auto_mount", .type = BLOBMSG_TYPE_INT32 },
  81         [CFG_DELAY_ROOT] = { .name = "delay_root", .type = BLOBMSG_TYPE_INT32 },
  82         [CFG_CHECK_FS] = { .name = "check_fs", .type = BLOBMSG_TYPE_INT32 },
  83 };
  84
  85 enum {
  86         MOUNT_UUID,
  87         MOUNT_LABEL,
  88         MOUNT_ENABLE,
  89         MOUNT_TARGET,
  90         MOUNT_DEVICE,
  91         MOUNT_OPTIONS,
  92         __MOUNT_MAX
  93 };
  94
  95 static const struct uci_blob_param_list config_attr_list = {
  96         .n_params = __CFG_MAX,
  97         .params = config_policy,
  98 };
  99
 100 static const struct blobmsg_policy mount_policy[__MOUNT_MAX] = {
 101         [MOUNT_UUID] = { .name = "uuid", .type = BLOBMSG_TYPE_STRING },
 102         [MOUNT_LABEL] = { .name = "label", .type = BLOBMSG_TYPE_STRING },
 103         [MOUNT_DEVICE] = { .name = "device", .type = BLOBMSG_TYPE_STRING },
 104         [MOUNT_TARGET] = { .name = "target", .type = BLOBMSG_TYPE_STRING },
 105         [MOUNT_OPTIONS] = { .name = "options", .type = BLOBMSG_TYPE_STRING },
 106         [MOUNT_ENABLE] = { .name = "enabled", .type = BLOBMSG_TYPE_INT32 },
 107 };
 108
 109 static const struct uci_blob_param_list mount_attr_list = {
 110         .n_params = __MOUNT_MAX,
 111         .params = mount_policy,
 112 };
 113
 114 enum {
 115         SWAP_ENABLE,
 116         SWAP_UUID,
 117         SWAP_LABEL,
 118         SWAP_DEVICE,
 119         SWAP_PRIO,
 120         __SWAP_MAX
 121 };
 122
 123 static const struct blobmsg_policy swap_policy[__SWAP_MAX] = {
 124         [SWAP_ENABLE] = { .name = "enabled", .type = BLOBMSG_TYPE_INT32 },
 125         [SWAP_UUID] = { .name = "uuid", .type = BLOBMSG_TYPE_STRING },
 126         [SWAP_LABEL] = { .name = "label", .type = BLOBMSG_TYPE_STRING },
 127         [SWAP_DEVICE] = { .name = "device", .type = BLOBMSG_TYPE_STRING },
 128         [SWAP_PRIO] = { .name = "priority", .type = BLOBMSG_TYPE_INT32 },
 129 };
 130
 131 static const struct uci_blob_param_list swap_attr_list = {
 132         .n_params = __SWAP_MAX,
 133         .params = swap_policy,
 134 };
 135
 136 struct mount_flag {
 137         const char *name;
 138         int32_t flag;
 139 };
 140
 141 #ifndef MS_DIRSYNC
 142 #       define MS_DIRSYNC               (1 << 7)
 143 #endif
 144
 145 #ifndef MS_RELATIME
 146 #       define MS_RELATIME              (1 << 21)
 147 #endif
 148
 149 #ifndef MS_STRICTATIME
 150 #       define MS_STRICTATIME   (1 << 24)
 151 #endif
 152
 153 static const struct mount_flag mount_flags[] = {
 154         { "sync",                       MS_SYNCHRONOUS  },
 155         { "async",                      ~MS_SYNCHRONOUS },
 156         { "dirsync",            MS_DIRSYNC              },
 157         { "mand",                       MS_MANDLOCK             },
 158         { "nomand",                     ~MS_MANDLOCK    },
 159         { "atime",                      ~MS_NOATIME             },
 160         { "noatime",            MS_NOATIME              },
 161         { "dev",                        ~MS_NODEV               },
 162         { "nodev",                      MS_NODEV                },
 163         { "diratime",           ~MS_NODIRATIME  },
 164         { "nodiratime",         MS_NODIRATIME   },
 165         { "exec",                       ~MS_NOEXEC              },
 166         { "noexec",                     MS_NOEXEC               },
 167         { "suid",                       ~MS_NOSUID              },
 168         { "nosuid",                     MS_NOSUID               },
 169         { "rw",                         ~MS_RDONLY              },
 170         { "ro",                         MS_RDONLY               },
 171         { "relatime",           MS_RELATIME             },
 172         { "norelatime",         ~MS_RELATIME    },
 173         { "strictatime",        MS_STRICTATIME  },
 174 };
 175
 176 static char *blobmsg_get_strdup(struct blob_attr *attr)
 177 {
 178         if (!attr)
 179                 return NULL;
 180
 181         return strdup(blobmsg_get_string(attr));
 182 }
 183
 184 static char *blobmsg_get_basename(struct blob_attr *attr)
 185 {
 186         if (!attr)
 187                 return NULL;
 188
 189         return strdup(basename(blobmsg_get_string(attr)));
 190 }
 191
 192 static void parse_mount_options(struct mount *m, char *optstr)
 193 {
 194         int i;
 195         bool is_flag;
 196         char *p, *opts, *last;
 197
 198         m->flags = 0;
 199         m->options = NULL;
 200
 201         if (!optstr || !*optstr)
 202                 return;
 203
 204         m->options = opts = calloc(1, strlen(optstr) + 1);
 205
 206         if (!m->options)
 207                 return;
 208
 209         p = last = optstr;
 210
 211         do {
 212                 p = strchr(p, ',');
 213
 214                 if (p)
 215                         *p++ = 0;
 216
 217                 for (i = 0, is_flag = false; i < ARRAY_SIZE(mount_flags); i++) {
 218                         if (!strcmp(last, mount_flags[i].name)) {
 219                                 if (mount_flags[i].flag < 0)
 220                                         m->flags &= (uint32_t)mount_flags[i].flag;
 221                                 else
 222                                         m->flags |= (uint32_t)mount_flags[i].flag;
 223                                 is_flag = true;
 224                                 break;
 225                         }
 226                 }
 227
 228                 if (!is_flag)
 229                         opts += sprintf(opts, "%s%s", (opts > m->options) ? "," : "", last);
 230
 231                 last = p;
 232
 233         } while (p);
 234
 235         free(optstr);
 236 }
 237
 238 static int mount_add(struct uci_section *s)
 239 {
 240         struct blob_attr *tb[__MOUNT_MAX] = { 0 };
 241         struct mount *m;
 242
 243         blob_buf_init(&b, 0);
 244         uci_to_blob(&b, s, &mount_attr_list);
 245         blobmsg_parse(mount_policy, __MOUNT_MAX, tb, blob_data(b.head), blob_len(b.head));
 246
 247         if (!tb[MOUNT_LABEL] && !tb[MOUNT_UUID] && !tb[MOUNT_DEVICE])
 248                 return -1;
 249
 250         if (tb[MOUNT_ENABLE] && !blobmsg_get_u32(tb[MOUNT_ENABLE]))
 251                 return -1;
 252
 253         m = malloc(sizeof(struct mount));
 254         m->type = TYPE_MOUNT;
 255         m->uuid = blobmsg_get_strdup(tb[MOUNT_UUID]);
 256         m->label = blobmsg_get_strdup(tb[MOUNT_LABEL]);
 257         m->target = blobmsg_get_strdup(tb[MOUNT_TARGET]);
 258         m->device = blobmsg_get_basename(tb[MOUNT_DEVICE]);
 259
 260         parse_mount_options(m, blobmsg_get_strdup(tb[MOUNT_OPTIONS]));
 261
 262         m->overlay = m->extroot = 0;
 263         if (m->target && !strcmp(m->target, "/"))
 264                 m->extroot = 1;
 265         if (m->target && !strcmp(m->target, "/overlay"))
 266                 m->extroot = m->overlay = 1;
 267
 268         if (m->uuid)
 269                 vlist_add(&mounts, &m->node, m->uuid);
 270         else if (m->label)
 271                 vlist_add(&mounts, &m->node, m->label);
 272         else if (m->device)
 273                 vlist_add(&mounts, &m->node, m->device);
 274
 275         return 0;
 276 }
 277
 278 static int swap_add(struct uci_section *s)
 279 {
 280         struct blob_attr *tb[__SWAP_MAX] = { 0 };
 281         struct mount *m;
 282
 283         blob_buf_init(&b, 0);
 284         uci_to_blob(&b, s, &swap_attr_list);
 285         blobmsg_parse(swap_policy, __SWAP_MAX, tb, blob_data(b.head), blob_len(b.head));
 286
 287         if (!tb[SWAP_UUID] && !tb[SWAP_LABEL] && !tb[SWAP_DEVICE])
 288                 return -1;
 289
 290         m = malloc(sizeof(struct mount));
 291         memset(m, 0, sizeof(struct mount));
 292         m->type = TYPE_SWAP;
 293         m->uuid = blobmsg_get_strdup(tb[SWAP_UUID]);
 294         m->label = blobmsg_get_strdup(tb[SWAP_LABEL]);
 295         m->device = blobmsg_get_basename(tb[SWAP_DEVICE]);
 296         if (tb[SWAP_PRIO])
 297                 m->prio = blobmsg_get_u32(tb[SWAP_PRIO]);
 298         if (m->prio)
 299                 m->prio = ((m->prio << SWAP_FLAG_PRIO_SHIFT) & SWAP_FLAG_PRIO_MASK) | SWAP_FLAG_PREFER;
 300
 301         if ((!tb[SWAP_ENABLE]) || blobmsg_get_u32(tb[SWAP_ENABLE])) {
 302                 /* store complete swap path */
 303                 if (tb[SWAP_DEVICE])
 304                         m->target = blobmsg_get_strdup(tb[SWAP_DEVICE]);
 305
 306                 if (m->uuid)
 307                         vlist_add(&mounts, &m->node, m->uuid);
 308                 else if (m->label)
 309                         vlist_add(&mounts, &m->node, m->label);
 310                 else if (m->device)
 311                         vlist_add(&mounts, &m->node, m->device);
 312         }
 313
 314         return 0;
 315 }
 316
 317 static int global_add(struct uci_section *s)
 318 {
 319         struct blob_attr *tb[__CFG_MAX] = { 0 };
 320
 321         blob_buf_init(&b, 0);
 322         uci_to_blob(&b, s, &config_attr_list);
 323         blobmsg_parse(config_policy, __CFG_MAX, tb, blob_data(b.head), blob_len(b.head));
 324
 325         if ((tb[CFG_ANON_MOUNT]) && blobmsg_get_u32(tb[CFG_ANON_MOUNT]))
 326                 anon_mount = 1;
 327         if ((tb[CFG_ANON_SWAP]) && blobmsg_get_u32(tb[CFG_ANON_SWAP]))
 328                 anon_swap = 1;
 329
 330         if ((tb[CFG_AUTO_MOUNT]) && blobmsg_get_u32(tb[CFG_AUTO_MOUNT]))
 331                 auto_mount = 1;
 332         if ((tb[CFG_AUTO_SWAP]) && blobmsg_get_u32(tb[CFG_AUTO_SWAP]))
 333                 auto_swap = 1;
 334
 335         if (tb[CFG_DELAY_ROOT])
 336                 delay_root = blobmsg_get_u32(tb[CFG_DELAY_ROOT]);
 337
 338         if ((tb[CFG_CHECK_FS]) && blobmsg_get_u32(tb[CFG_CHECK_FS]))
 339                 check_fs = 1;
 340
 341         return 0;
 342 }
 343
 344 static struct mount* find_swap(const char *uuid, const char *label, const char *device)
 345 {
 346         struct mount *m;
 347
 348         vlist_for_each_element(&mounts, m, node) {
 349                 if (m->type != TYPE_SWAP)
 350                         continue;
 351                 if (uuid && m->uuid && !strcmp(m->uuid, uuid))
 352                         return m;
 353                 if (label && m->label && !strcmp(m->label, label))
 354                         return m;
 355                 if (device && m->device && !strcmp(m->device, device))
 356                         return m;
 357         }
 358
 359         return NULL;
 360 }
 361
 362 static struct mount* find_block(const char *uuid, const char *label, const char *device,
 363                                 const char *target)
 364 {
 365         struct mount *m;
 366
 367         vlist_for_each_element(&mounts, m, node) {
 368                 if (m->type != TYPE_MOUNT)
 369                         continue;
 370                 if (m->uuid && uuid && !strcmp(m->uuid, uuid))
 371                         return m;
 372                 if (m->label && label && !strcmp(m->label, label))
 373                         return m;
 374                 if (m->target && target && !strcmp(m->target, target))
 375                         return m;
 376                 if (m->device && device && !strcmp(m->device, device))
 377                         return m;
 378         }
 379
 380         return NULL;
 381 }
 382
 383 static void mounts_update(struct vlist_tree *tree, struct vlist_node *node_new,
 384                           struct vlist_node *node_old)
 385 {
 386 }
 387
 388 static int config_load(char *cfg)
 389 {
 390         struct uci_context *ctx;
 391         struct uci_package *pkg;
 392         struct uci_element *e;
 393
 394         vlist_init(&mounts, avl_strcmp, mounts_update);
 395
 396         ctx = uci_alloc_context();
 397         if (cfg) {
 398                 char path[32];
 399                 snprintf(path, 32, "%s/etc/config", cfg);
 400                 uci_set_confdir(ctx, path);
 401         }
 402
 403         if (uci_load(ctx, "fstab", &pkg))
 404                 return -1;
 405
 406         vlist_update(&mounts);
 407         uci_foreach_element(&pkg->sections, e) {
 408                 struct uci_section *s = uci_to_section(e);
 409
 410                 if (!strcmp(s->type, "mount"))
 411                         mount_add(s);
 412                 if (!strcmp(s->type, "swap"))
 413                         swap_add(s);
 414                 if (!strcmp(s->type, "global"))
 415                         global_add(s);
 416         }
 417         vlist_flush(&mounts);
 418
 419         return 0;
 420 }
 421
 422 static struct blkid_struct_probe* _probe_path(char *path)
 423 {
 424         struct blkid_struct_probe *pr;
 425
 426         pr = malloc(sizeof(*pr));
 427
 428         if (!pr)
 429                 return NULL;
 430
 431         memset(pr, 0, sizeof(*pr));
 432         probe_block(path, pr);
 433
 434         if (pr->err || !pr->id) {
 435                 free(pr);
 436                 return NULL;
 437         }
 438
 439         return pr;
 440 }
 441
 442 static int _cache_load(const char *path)
 443 {
 444         int gl_flags = GLOB_NOESCAPE | GLOB_MARK;
 445         int j;
 446         glob_t gl;
 447
 448         if (glob(path, gl_flags, NULL, &gl) < 0)
 449                 return -1;
 450
 451         for (j = 0; j < gl.gl_pathc; j++) {
 452                 struct blkid_struct_probe *pr = _probe_path(gl.gl_pathv[j]);
 453                 if (pr)
 454                         list_add_tail(&pr->list, &devices);
 455         }
 456
 457         globfree(&gl);
 458
 459         return 0;
 460 }
 461
 462 static void cache_load(int mtd)
 463 {
 464         if (mtd)
 465                 _cache_load("/dev/mtdblock*");
 466         _cache_load("/dev/mmcblk*");
 467         _cache_load("/dev/sd*");
 468         _cache_load("/dev/sdc*");
 469         _cache_load("/dev/hd*");
 470         _cache_load("/dev/md*");
 471         _cache_load("/dev/mapper/*");
 472 }
 473
 474 static int print_block_info(struct blkid_struct_probe *pr)
 475 {
 476         printf("%s:", pr->dev);
 477         if (pr->uuid[0])
 478                 printf(" UUID=\"%s\"", pr->uuid);
 479
 480         if (pr->label[0])
 481                 printf(" LABEL=\"%s\"", pr->label);
 482
 483         if (pr->name[0])
 484                 printf(" NAME=\"%s\"", pr->name);
 485
 486         if (pr->version[0])
 487                 printf(" VERSION=\"%s\"", pr->version);
 488
 489         printf(" TYPE=\"%s\"\n", pr->id->name);
 490
 491         return 0;
 492 }
 493
 494 static int print_block_uci(struct blkid_struct_probe *pr)
 495 {
 496         if (!strcmp(pr->id->name, "swap")) {
 497                 printf("config 'swap'\n");
 498         } else {
 499                 printf("config 'mount'\n");
 500                 printf("\toption\ttarget\t'/mnt/%s'\n", basename(pr->dev));
 501         }
 502         if (pr->uuid[0])
 503                 printf("\toption\tuuid\t'%s'\n", pr->uuid);
 504         else
 505                 printf("\toption\tdevice\t'%s'\n", pr->dev);
 506         printf("\toption\tenabled\t'0'\n\n");
 507
 508         return 0;
 509 }
 510
 511 static struct blkid_struct_probe* find_block_info(char *uuid, char *label, char *path)
 512 {
 513         struct blkid_struct_probe *pr = NULL;
 514
 515         if (uuid)
 516                 list_for_each_entry(pr, &devices, list)
 517                         if (!strcmp(pr->uuid, uuid))
 518                                 return pr;
 519
 520         if (label)
 521                 list_for_each_entry(pr, &devices, list)
 522                         if (strcmp(pr->label, label))
 523                                 return pr;
 524
 525         if (path)
 526                 list_for_each_entry(pr, &devices, list)
 527                         if (!strcmp(pr->dev, path))
 528                                 return pr;
 529
 530         return NULL;
 531 }
 532
 533 static char* find_mount_point(char *block)
 534 {
 535         FILE *fp = fopen("/proc/mounts", "r");
 536         static char line[256];
 537         int len = strlen(block);
 538         char *point = NULL;
 539
 540         if(!fp)
 541                 return NULL;
 542
 543         while (fgets(line, sizeof(line), fp)) {
 544                 if (!strncmp(line, block, len)) {
 545                         char *p = &line[len + 1];
 546                         char *t = strstr(p, " ");
 547
 548                         if (!t) {
 549                                 fclose(fp);
 550                                 return NULL;
 551                         }
 552                         *t = '\0';
 553                         point = p;
 554                         break;
 555                 }
 556         }
 557
 558         fclose(fp);
 559
 560         return point;
 561 }
 562
 563 static void mkdir_p(char *dir)
 564 {
 565         char *l = strrchr(dir, '/');
 566
 567         if (l) {
 568                 *l = '\0';
 569                 mkdir_p(dir);
 570                 *l = '/';
 571                 mkdir(dir, 0755);
 572         }
 573 }
 574
 575 static void check_filesystem(struct blkid_struct_probe *pr)
 576 {
 577         pid_t pid;
 578         struct stat statbuf;
 579         char *e2fsck = "/usr/sbin/e2fsck";
 580
 581         if (strncmp(pr->id->name, "ext", 3)) {
 582                 fprintf(stderr, "check_filesystem: %s is not supported\n", pr->id->name);
 583                 return;
 584         }
 585
 586         if (stat(e2fsck, &statbuf) < 0) {
 587                 fprintf(stderr, "check_filesystem: %s not found\n", e2fsck);
 588                 return;
 589         }
 590
 591         pid = fork();
 592         if (!pid) {
 593                 execl(e2fsck, e2fsck, "-p", pr->dev, NULL);
 594                 exit(-1);
 595         } else if (pid > 0) {
 596                 int status;
 597
 598                 waitpid(pid, &status, 0);
 599                 if (WEXITSTATUS(status))
 600                         fprintf(stderr, "check_filesystem: %s returned %d\n", e2fsck, WEXITSTATUS(status));
 601         }
 602 }
 603
 604 static void handle_swapfiles(bool on)
 605 {
 606         struct stat s;
 607         struct mount *m;
 608         struct blkid_struct_probe *pr;
 609
 610         vlist_for_each_element(&mounts, m, node)
 611         {
 612                 if (m->type != TYPE_SWAP || !m->target)
 613                         continue;
 614
 615                 if (stat(m->target, &s) || !S_ISREG(s.st_mode))
 616                         continue;
 617
 618                 pr = _probe_path(m->target);
 619
 620                 if (!pr)
 621                         continue;
 622
 623                 if (!strcmp(pr->id->name, "swap")) {
 624                         if (on)
 625                                 swapon(pr->dev, m->prio);
 626                         else
 627                                 swapoff(pr->dev);
 628                 }
 629
 630                 free(pr);
 631         }
 632 }
 633
 634 static int mount_device(struct blkid_struct_probe *pr, int hotplug)
 635 {
 636         struct mount *m;
 637         char *device;
 638
 639         if (!pr)
 640                 return -1;
 641
 642         device = basename(pr->dev);
 643
 644         if (!strcmp(pr->id->name, "swap")) {
 645                 if (hotplug && !auto_swap)
 646                         return -1;
 647                 m = find_swap(pr->uuid, pr->label, device);
 648                 if (m || anon_swap)
 649                         swapon(pr->dev, (m) ? (m->prio) : (0));
 650
 651                 return 0;
 652         }
 653
 654         if (hotplug && !auto_mount)
 655                 return -1;
 656
 657         if (find_mount_point(pr->dev)) {
 658                 fprintf(stderr, "%s is already mounted\n", pr->dev);
 659                 return -1;
 660         }
 661
 662         m = find_block(pr->uuid, pr->label, device, NULL);
 663         if (m && m->extroot)
 664                 return -1;
 665
 666         if (m) {
 667                 char *target = m->target;
 668                 char _target[32];
 669                 int err = 0;
 670
 671                 if (!target) {
 672                         snprintf(_target, sizeof(_target), "/mnt/%s", device);
 673                         target = _target;
 674                 }
 675                 mkdir_p(target);
 676
 677                 if (check_fs)
 678                         check_filesystem(pr);
 679
 680                 err = mount(pr->dev, target, pr->id->name, m->flags,
 681                             (m->options) ? (m->options) : (""));
 682                 if (err)
 683                         fprintf(stderr, "mounting %s (%s) as %s failed (%d) - %s\n",
 684                                         pr->dev, pr->id->name, target, err, strerror(err));
 685                 else
 686                         handle_swapfiles(true);
 687                 return err;
 688         }
 689
 690         if (anon_mount) {
 691                 char target[] = "/mnt/mmcblk123";
 692                 int err = 0;
 693
 694                 snprintf(target, sizeof(target), "/mnt/%s", device);
 695                 mkdir_p(target);
 696
 697                 if (check_fs)
 698                         check_filesystem(pr);
 699
 700                 err = mount(pr->dev, target, pr->id->name, 0, "");
 701                 if (err)
 702                         fprintf(stderr, "mounting %s (%s) as %s failed (%d) - %s\n",
 703                                         pr->dev, pr->id->name, target, err, strerror(err));
 704                 else
 705                         handle_swapfiles(true);
 706                 return err;
 707         }
 708
 709         return 0;
 710 }
 711
 712 static int umount_device(struct blkid_struct_probe *pr)
 713 {
 714         struct mount *m;
 715         char *device = basename(pr->dev);
 716         char *mp;
 717         int err;
 718
 719         if (!pr)
 720                 return -1;
 721
 722         if (!strcmp(pr->id->name, "swap"))
 723                 return -1;
 724
 725         mp = find_mount_point(pr->dev);
 726         if (!mp)
 727                 return -1;
 728
 729         m = find_block(pr->uuid, pr->label, device, NULL);
 730         if (m && m->extroot)
 731                 return -1;
 732
 733         err = umount2(mp, MNT_DETACH);
 734         if (err)
 735                 fprintf(stderr, "unmounting %s (%s)  failed (%d) - %s\n",
 736                         pr->dev, mp, err, strerror(err));
 737         else
 738                 fprintf(stderr, "unmounted %s (%s)\n",
 739                         pr->dev, mp);
 740
 741         return err;
 742 }
 743
 744 static int main_hotplug(int argc, char **argv)
 745 {
 746         char path[32];
 747         char *action, *device, *mount_point;
 748
 749         action = getenv("ACTION");
 750         device = getenv("DEVNAME");
 751
 752         if (!action || !device)
 753                 return -1;
 754         snprintf(path, sizeof(path), "/dev/%s", device);
 755
 756         if (!strcmp(action, "remove")) {
 757                 int err = 0;
 758                 mount_point = find_mount_point(path);
 759                 if (mount_point)
 760                         err = umount2(mount_point, MNT_DETACH);
 761
 762                 if (err)
 763                         fprintf(stderr, "umount of %s failed (%d) - %s\n",
 764                                         mount_point, err, strerror(err));
 765
 766                 return 0;
 767         } else if (strcmp(action, "add")) {
 768                 fprintf(stderr, "Unkown action %s\n", action);
 769
 770                 return -1;
 771         }
 772
 773         if (config_load(NULL))
 774                 return -1;
 775         cache_load(0);
 776
 777         return mount_device(find_block_info(NULL, NULL, path), 1);
 778 }
 779
 780 static int find_block_mtd(char *name, char *part, int plen)
 781 {
 782         FILE *fp = fopen("/proc/mtd", "r");
 783         static char line[256];
 784         char *index = NULL;
 785
 786         if(!fp)
 787                 return -1;
 788
 789         while (!index && fgets(line, sizeof(line), fp)) {
 790                 if (strstr(line, name)) {
 791                         char *eol = strstr(line, ":");
 792
 793                         if (!eol)
 794                                 continue;
 795
 796                         *eol = '\0';
 797                         index = &line[3];
 798                 }
 799         }
 800
 801         fclose(fp);
 802
 803         if (!index)
 804                 return -1;
 805
 806         snprintf(part, plen, "/dev/mtdblock%s", index);
 807
 808         return 0;
 809 }
 810
 811 static int check_extroot(char *path)
 812 {
 813         struct blkid_struct_probe *pr = NULL;
 814         char fs[32];
 815
 816         if (find_block_mtd("rootfs", fs, sizeof(fs)))
 817                 return -1;
 818
 819         list_for_each_entry(pr, &devices, list) {
 820                 if (!strcmp(pr->dev, fs)) {
 821                         struct stat s;
 822                         FILE *fp = NULL;
 823                         char tag[64];
 824                         char uuid[64] = { 0 };
 825
 826                         snprintf(tag, sizeof(tag), "%s/etc/.extroot-uuid", path);
 827                         if (stat(tag, &s)) {
 828                                 fp = fopen(tag, "w+");
 829                                 if (!fp) {
 830                                         fprintf(stderr, "extroot: failed to write uuid tag file\n");
 831                                         /* return 0 to continue boot regardless of error */
 832                                         return 0;
 833                                 }
 834                                 fputs(pr->uuid, fp);
 835                                 fclose(fp);
 836                                 return 0;
 837                         }
 838
 839                         fp = fopen(tag, "r");
 840                         if (!fp) {
 841                                 fprintf(stderr, "extroot: failed to open uuid tag file\n");
 842                                 return -1;
 843                         }
 844
 845                         fgets(uuid, sizeof(uuid), fp);
 846                         fclose(fp);
 847                         if (!strcmp(uuid, pr->uuid))
 848                                 return 0;
 849                         fprintf(stderr, "extroot: uuid tag does not match rom uuid\n");
 850                 }
 851         }
 852         return -1;
 853 }
 854
 855 static int mount_extroot(char *cfg)
 856 {
 857         char overlay[] = "/tmp/extroot/overlay";
 858         char mnt[] = "/tmp/extroot/mnt";
 859         char *path = mnt;
 860         struct blkid_struct_probe *pr;
 861         struct mount *m;
 862         int err = -1;
 863
 864         if (config_load(cfg))
 865                 return -2;
 866
 867         m = find_block(NULL, NULL, NULL, "/");
 868         if (!m)
 869                 m = find_block(NULL, NULL, NULL, "/overlay");
 870
 871         if (!m || !m->extroot)
 872                 return -1;
 873
 874         pr = find_block_info(m->uuid, m->label, NULL);
 875
 876         if (!pr && delay_root){
 877                 fprintf(stderr, "extroot: is not ready yet, retrying in %u seconds\n", delay_root);
 878                 sleep(delay_root);
 879                 mkblkdev();
 880                 cache_load(0);
 881                 pr = find_block_info(m->uuid, m->label, NULL);
 882         }
 883         if (pr) {
 884                 if (strncmp(pr->id->name, "ext", 3)) {
 885                         fprintf(stderr, "extroot: %s is not supported, try ext4\n", pr->id->name);
 886                         return -1;
 887                 }
 888                 if (m->overlay)
 889                         path = overlay;
 890                 mkdir_p(path);
 891
 892                 if (check_fs)
 893                         check_filesystem(pr);
 894
 895                 err = mount(pr->dev, path, pr->id->name, 0, (m->options) ? (m->options) : (""));
 896
 897                 if (err) {
 898                         fprintf(stderr, "mounting %s (%s) as %s failed (%d) - %s\n",
 899                                         pr->dev, pr->id->name, path, err, strerror(err));
 900                 } else if (m->overlay) {
 901                         err = check_extroot(path);
 902                         if (err)
 903                                 umount(path);
 904                 }
 905         }
 906
 907         return err;
 908 }
 909
 910 static int main_extroot(int argc, char **argv)
 911 {
 912         struct blkid_struct_probe *pr;
 913         char fs[32] = { 0 };
 914         char fs_data[32] = { 0 };
 915         int err = -1;
 916
 917         if (!getenv("PREINIT"))
 918                 return -1;
 919
 920         if (argc != 2) {
 921                 fprintf(stderr, "Usage: block extroot mountpoint\n");
 922                 return -1;
 923         }
 924
 925         mkblkdev();
 926         cache_load(1);
 927
 928         find_block_mtd("rootfs", fs, sizeof(fs));
 929         if (!fs[0])
 930                 return -2;
 931
 932         pr = find_block_info(NULL, NULL, fs);
 933         if (!pr)
 934                 return -3;
 935
 936         find_block_mtd("rootfs_data", fs_data, sizeof(fs_data));
 937         if (fs_data[0]) {
 938                 pr = find_block_info(NULL, NULL, fs_data);
 939                 if (pr && !strcmp(pr->id->name, "jffs2")) {
 940                         char cfg[] = "/tmp/jffs_cfg";
 941
 942                         mkdir_p(cfg);
 943                         if (!mount(fs_data, cfg, "jffs2", MS_NOATIME, NULL)) {
 944                                 err = mount_extroot(cfg);
 945                                 umount2(cfg, MNT_DETACH);
 946                         }
 947                         if (err < 0)
 948                                 rmdir("/tmp/overlay");
 949                         rmdir(cfg);
 950                         return err;
 951                 }
 952         }
 953
 954         return mount_extroot(NULL);
 955 }
 956
 957 static int main_mount(int argc, char **argv)
 958 {
 959         struct blkid_struct_probe *pr;
 960
 961         if (config_load(NULL))
 962                 return -1;
 963
 964         cache_load(1);
 965         list_for_each_entry(pr, &devices, list)
 966                 mount_device(pr, 0);
 967
 968         handle_swapfiles(true);
 969
 970         return 0;
 971 }
 972
 973 static int main_umount(int argc, char **argv)
 974 {
 975         struct blkid_struct_probe *pr;
 976
 977         if (config_load(NULL))
 978                 return -1;
 979
 980         handle_swapfiles(false);
 981
 982         cache_load(0);
 983         list_for_each_entry(pr, &devices, list)
 984                 umount_device(pr);
 985
 986         return 0;
 987 }
 988
 989 static int main_detect(int argc, char **argv)
 990 {
 991         struct blkid_struct_probe *pr;
 992
 993         cache_load(0);
 994         printf("config 'global'\n");
 995         printf("\toption\tanon_swap\t'0'\n");
 996         printf("\toption\tanon_mount\t'0'\n");
 997         printf("\toption\tauto_swap\t'1'\n");
 998         printf("\toption\tauto_mount\t'1'\n");
 999         printf("\toption\tdelay_root\t'5'\n");
1000         printf("\toption\tcheck_fs\t'0'\n\n");
1001         list_for_each_entry(pr, &devices, list)
1002                 print_block_uci(pr);
1003
1004         return 0;
1005 }
1006
1007 static int main_info(int argc, char **argv)
1008 {
1009         int i;
1010         struct blkid_struct_probe *pr;
1011
1012         cache_load(1);
1013         if (argc == 2) {
1014                 list_for_each_entry(pr, &devices, list)
1015                         print_block_info(pr);
1016
1017                 return 0;
1018         };
1019
1020         for (i = 2; i < argc; i++) {
1021                 struct stat s;
1022
1023                 if (stat(argv[i], &s)) {
1024                         fprintf(stderr, "failed to stat %s\n", argv[i]);
1025                         continue;
1026                 }
1027                 if (!S_ISBLK(s.st_mode)) {
1028                         fprintf(stderr, "%s is not a block device\n", argv[i]);
1029                         continue;
1030                 }
1031                 pr = find_block_info(NULL, NULL, argv[i]);
1032                 if (pr)
1033                         print_block_info(pr);
1034         }
1035
1036         return 0;
1037 }
1038
1039 static int main_swapon(int argc, char **argv)
1040 {
1041         if (argc != 2) {
1042                 fprintf(stderr, "Usage: swapon <-s> <-a> [DEVICE]\n\n\tStart swapping on [DEVICE]\n -a\tStart swapping on all swap devices\n -s\tShow summary\n");
1043                 return -1;
1044         }
1045
1046         if (!strcmp(argv[1], "-s")) {
1047                 FILE *fp = fopen("/proc/swaps", "r");
1048                 char *lineptr = NULL;
1049                 size_t s;
1050
1051                 if (!fp) {
1052                         fprintf(stderr, "failed to open /proc/swaps\n");
1053                         return -1;
1054                 }
1055                 while (getline(&lineptr, &s, fp) > 0)
1056                         printf(lineptr);
1057                 if (lineptr)
1058                         free(lineptr);
1059                 fclose(fp);
1060         } else if (!strcmp(argv[1], "-a")) {
1061                 struct blkid_struct_probe *pr;
1062
1063                 cache_load(0);
1064                 list_for_each_entry(pr, &devices, list) {
1065                         if (strcmp(pr->id->name, "swap"))
1066                                 continue;
1067                         if (swapon(pr->dev, 0))
1068                                 fprintf(stderr, "failed to swapon %s\n", pr->dev);
1069                 }
1070         } else {
1071                 struct stat s;
1072                 int err;
1073
1074                 if (stat(argv[1], &s) || (!S_ISBLK(s.st_mode) && !S_ISREG(s.st_mode))) {
1075                         fprintf(stderr, "%s is not a block device or file\n", argv[1]);
1076                         return -1;
1077                 }
1078                 err = swapon(argv[1], 0);
1079                 if (err) {
1080                         fprintf(stderr, "failed to swapon %s (%d)\n", argv[1], err);
1081                         return err;
1082                 }
1083         }
1084
1085         return 0;
1086 }
1087
1088 static int main_swapoff(int argc, char **argv)
1089 {
1090         if (argc != 2) {
1091                 fprintf(stderr, "Usage: swapoff [-a] [DEVICE]\n\n\tStop swapping on DEVICE\n -a\tStop swapping on all swap devices\n");
1092                 return -1;
1093         }
1094
1095         if (!strcmp(argv[1], "-a")) {
1096                 FILE *fp = fopen("/proc/swaps", "r");
1097                 char line[256];
1098
1099                 if (!fp) {
1100                         fprintf(stderr, "failed to open /proc/swaps\n");
1101                         return -1;
1102                 }
1103                 fgets(line, sizeof(line), fp);
1104                 while (fgets(line, sizeof(line), fp)) {
1105                         char *end = strchr(line, ' ');
1106                         int err;
1107
1108                         if (!end)
1109                                 continue;
1110                         *end = '\0';
1111                         err = swapoff(line);
1112                         if (err)
1113                                 fprintf(stderr, "failed to swapoff %s (%d)\n", line, err);
1114                 }
1115                 fclose(fp);
1116         } else {
1117                 struct stat s;
1118                 int err;
1119
1120                 if (stat(argv[1], &s) || (!S_ISBLK(s.st_mode) && !S_ISREG(s.st_mode))) {
1121                         fprintf(stderr, "%s is not a block device or file\n", argv[1]);
1122                         return -1;
1123                 }
1124                 err = swapoff(argv[1]);
1125                 if (err) {
1126                         fprintf(stderr, "fsiled to swapoff %s (%d)\n", argv[1], err);
1127                         return err;
1128                 }
1129         }
1130
1131         return 0;
1132 }
1133
1134 int main(int argc, char **argv)
1135 {
1136         char *base = basename(*argv);
1137
1138         umask(0);
1139
1140         if (!strcmp(base, "swapon"))
1141                 return main_swapon(argc, argv);
1142
1143         if (!strcmp(base, "swapoff"))
1144                 return main_swapoff(argc, argv);
1145
1146         if ((argc > 1) && !strcmp(base, "block")) {
1147                 if (!strcmp(argv[1], "info"))
1148                         return main_info(argc, argv);
1149
1150                 if (!strcmp(argv[1], "detect"))
1151                         return main_detect(argc, argv);
1152
1153                 if (!strcmp(argv[1], "hotplug"))
1154                         return main_hotplug(argc, argv);
1155
1156                 if (!strcmp(argv[1], "extroot"))
1157                         return main_extroot(argc, argv);
1158
1159                 if (!strcmp(argv[1], "mount"))
1160                         return main_mount(argc, argv);
1161
1162                 if (!strcmp(argv[1], "umount"))
1163                         return main_umount(argc, argv);
1164         }
1165
1166         fprintf(stderr, "Usage: block <info|mount|umount|detect>\n");
1167
1168         return -1;
1169 }