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                                 return NULL;
 550                         *t = '\0';
 551                         point = p;
 552                         break;
 553                 }
 554         }
 555
 556         fclose(fp);
 557
 558         return point;
 559 }
 560
 561 static void mkdir_p(char *dir)
 562 {
 563         char *l = strrchr(dir, '/');
 564
 565         if (l) {
 566                 *l = '\0';
 567                 mkdir_p(dir);
 568                 *l = '/';
 569                 mkdir(dir, 0755);
 570         }
 571 }
 572
 573 static void check_filesystem(struct blkid_struct_probe *pr)
 574 {
 575         pid_t pid;
 576         struct stat statbuf;
 577         char *e2fsck = "/usr/sbin/e2fsck";
 578
 579         if (strncmp(pr->id->name, "ext", 3)) {
 580                 fprintf(stderr, "check_filesystem: %s is not supported\n", pr->id->name);
 581                 return;
 582         }
 583
 584         if (stat(e2fsck, &statbuf) < 0) {
 585                 fprintf(stderr, "check_filesystem: %s not found\n", e2fsck);
 586                 return;
 587         }
 588
 589         pid = fork();
 590         if (!pid) {
 591                 execl(e2fsck, e2fsck, "-p", pr->dev, NULL);
 592                 exit(-1);
 593         } else if (pid > 0) {
 594                 int status;
 595
 596                 waitpid(pid, &status, 0);
 597                 if (WEXITSTATUS(status))
 598                         fprintf(stderr, "check_filesystem: %s returned %d\n", e2fsck, WEXITSTATUS(status));
 599         }
 600 }
 601
 602 static void handle_swapfiles(bool on)
 603 {
 604         struct stat s;
 605         struct mount *m;
 606         struct blkid_struct_probe *pr;
 607
 608         vlist_for_each_element(&mounts, m, node)
 609         {
 610                 if (m->type != TYPE_SWAP || !m->target)
 611                         continue;
 612
 613                 if (stat(m->target, &s) || !S_ISREG(s.st_mode))
 614                         continue;
 615
 616                 pr = _probe_path(m->target);
 617
 618                 if (!pr)
 619                         continue;
 620
 621                 if (!strcmp(pr->id->name, "swap")) {
 622                         if (on)
 623                                 swapon(pr->dev, m->prio);
 624                         else
 625                                 swapoff(pr->dev);
 626                 }
 627
 628                 free(pr);
 629         }
 630 }
 631
 632 static int mount_device(struct blkid_struct_probe *pr, int hotplug)
 633 {
 634         struct mount *m;
 635         char *device;
 636
 637         if (!pr)
 638                 return -1;
 639
 640         device = basename(pr->dev);
 641
 642         if (!strcmp(pr->id->name, "swap")) {
 643                 if (hotplug && !auto_swap)
 644                         return -1;
 645                 m = find_swap(pr->uuid, pr->label, device);
 646                 if (m || anon_swap)
 647                         swapon(pr->dev, (m) ? (m->prio) : (0));
 648
 649                 return 0;
 650         }
 651
 652         if (hotplug && !auto_mount)
 653                 return -1;
 654
 655         if (find_mount_point(pr->dev)) {
 656                 fprintf(stderr, "%s is already mounted\n", pr->dev);
 657                 return -1;
 658         }
 659
 660         m = find_block(pr->uuid, pr->label, device, NULL);
 661         if (m && m->extroot)
 662                 return -1;
 663
 664         if (m) {
 665                 char *target = m->target;
 666                 char _target[32];
 667                 int err = 0;
 668
 669                 if (!target) {
 670                         snprintf(_target, sizeof(_target), "/mnt/%s", device);
 671                         target = _target;
 672                 }
 673                 mkdir_p(target);
 674
 675                 if (check_fs)
 676                         check_filesystem(pr);
 677
 678                 err = mount(pr->dev, target, pr->id->name, m->flags,
 679                             (m->options) ? (m->options) : (""));
 680                 if (err)
 681                         fprintf(stderr, "mounting %s (%s) as %s failed (%d) - %s\n",
 682                                         pr->dev, pr->id->name, target, err, strerror(err));
 683                 else
 684                         handle_swapfiles(true);
 685                 return err;
 686         }
 687
 688         if (anon_mount) {
 689                 char target[] = "/mnt/mmcblk123";
 690                 int err = 0;
 691
 692                 snprintf(target, sizeof(target), "/mnt/%s", device);
 693                 mkdir_p(target);
 694
 695                 if (check_fs)
 696                         check_filesystem(pr);
 697
 698                 err = mount(pr->dev, target, pr->id->name, 0, "");
 699                 if (err)
 700                         fprintf(stderr, "mounting %s (%s) as %s failed (%d) - %s\n",
 701                                         pr->dev, pr->id->name, target, err, strerror(err));
 702                 else
 703                         handle_swapfiles(true);
 704                 return err;
 705         }
 706
 707         return 0;
 708 }
 709
 710 static int umount_device(struct blkid_struct_probe *pr)
 711 {
 712         struct mount *m;
 713         char *device = basename(pr->dev);
 714         char *mp;
 715         int err;
 716
 717         if (!pr)
 718                 return -1;
 719
 720         if (!strcmp(pr->id->name, "swap"))
 721                 return -1;
 722
 723         mp = find_mount_point(pr->dev);
 724         if (!mp)
 725                 return -1;
 726
 727         m = find_block(pr->uuid, pr->label, device, NULL);
 728         if (m && m->extroot)
 729                 return -1;
 730
 731         err = umount2(mp, MNT_DETACH);
 732         if (err)
 733                 fprintf(stderr, "unmounting %s (%s)  failed (%d) - %s\n",
 734                         pr->dev, mp, err, strerror(err));
 735         else
 736                 fprintf(stderr, "unmounted %s (%s)\n",
 737                         pr->dev, mp);
 738
 739         return err;
 740 }
 741
 742 static int main_hotplug(int argc, char **argv)
 743 {
 744         char path[32];
 745         char *action, *device, *mount_point;
 746
 747         action = getenv("ACTION");
 748         device = getenv("DEVNAME");
 749
 750         if (!action || !device)
 751                 return -1;
 752         snprintf(path, sizeof(path), "/dev/%s", device);
 753
 754         if (!strcmp(action, "remove")) {
 755                 int err = 0;
 756                 mount_point = find_mount_point(path);
 757                 if (mount_point)
 758                         err = umount2(mount_point, MNT_DETACH);
 759
 760                 if (err)
 761                         fprintf(stderr, "umount of %s failed (%d) - %s\n",
 762                                         mount_point, err, strerror(err));
 763
 764                 return 0;
 765         } else if (strcmp(action, "add")) {
 766                 fprintf(stderr, "Unkown action %s\n", action);
 767
 768                 return -1;
 769         }
 770
 771         if (config_load(NULL))
 772                 return -1;
 773         cache_load(0);
 774
 775         return mount_device(find_block_info(NULL, NULL, path), 1);
 776 }
 777
 778 static int find_block_mtd(char *name, char *part, int plen)
 779 {
 780         FILE *fp = fopen("/proc/mtd", "r");
 781         static char line[256];
 782         char *index = NULL;
 783
 784         if(!fp)
 785                 return -1;
 786
 787         while (!index && fgets(line, sizeof(line), fp)) {
 788                 if (strstr(line, name)) {
 789                         char *eol = strstr(line, ":");
 790
 791                         if (!eol)
 792                                 continue;
 793
 794                         *eol = '\0';
 795                         index = &line[3];
 796                 }
 797         }
 798
 799         fclose(fp);
 800
 801         if (!index)
 802                 return -1;
 803
 804         snprintf(part, plen, "/dev/mtdblock%s", index);
 805
 806         return 0;
 807 }
 808
 809 static int check_extroot(char *path)
 810 {
 811         struct blkid_struct_probe *pr = NULL;
 812         char fs[32];
 813
 814         if (find_block_mtd("rootfs", fs, sizeof(fs)))
 815                 return -1;
 816
 817         list_for_each_entry(pr, &devices, list) {
 818                 if (!strcmp(pr->dev, fs)) {
 819                         struct stat s;
 820                         FILE *fp = NULL;
 821                         char tag[64];
 822                         char uuid[64] = { 0 };
 823
 824                         snprintf(tag, sizeof(tag), "%s/etc/.extroot-uuid", path);
 825                         if (stat(tag, &s)) {
 826                                 fp = fopen(tag, "w+");
 827                                 if (!fp) {
 828                                         fprintf(stderr, "extroot: failed to write uuid tag file\n");
 829                                         /* return 0 to continue boot regardless of error */
 830                                         return 0;
 831                                 }
 832                                 fputs(pr->uuid, fp);
 833                                 fclose(fp);
 834                                 return 0;
 835                         }
 836
 837                         fp = fopen(tag, "r");
 838                         if (!fp) {
 839                                 fprintf(stderr, "extroot: failed to open uuid tag file\n");
 840                                 return -1;
 841                         }
 842
 843                         fgets(uuid, sizeof(uuid), fp);
 844                         fclose(fp);
 845                         if (!strcmp(uuid, pr->uuid))
 846                                 return 0;
 847                         fprintf(stderr, "extroot: uuid tag does not match rom uuid\n");
 848                 }
 849         }
 850         return -1;
 851 }
 852
 853 static int mount_extroot(char *cfg)
 854 {
 855         char overlay[] = "/tmp/extroot/overlay";
 856         char mnt[] = "/tmp/extroot/mnt";
 857         char *path = mnt;
 858         struct blkid_struct_probe *pr;
 859         struct mount *m;
 860         int err = -1;
 861
 862         if (config_load(cfg))
 863                 return -2;
 864
 865         m = find_block(NULL, NULL, NULL, "/");
 866         if (!m)
 867                 m = find_block(NULL, NULL, NULL, "/overlay");
 868
 869         if (!m || !m->extroot)
 870                 return -1;
 871
 872         pr = find_block_info(m->uuid, m->label, NULL);
 873
 874         if (!pr && delay_root){
 875                 fprintf(stderr, "extroot: is not ready yet, retrying in %u seconds\n", delay_root);
 876                 sleep(delay_root);
 877                 mkblkdev();
 878                 cache_load(0);
 879                 pr = find_block_info(m->uuid, m->label, NULL);
 880         }
 881         if (pr) {
 882                 if (strncmp(pr->id->name, "ext", 3)) {
 883                         fprintf(stderr, "extroot: %s is not supported, try ext4\n", pr->id->name);
 884                         return -1;
 885                 }
 886                 if (m->overlay)
 887                         path = overlay;
 888                 mkdir_p(path);
 889
 890                 if (check_fs)
 891                         check_filesystem(pr);
 892
 893                 err = mount(pr->dev, path, pr->id->name, 0, (m->options) ? (m->options) : (""));
 894
 895                 if (err) {
 896                         fprintf(stderr, "mounting %s (%s) as %s failed (%d) - %s\n",
 897                                         pr->dev, pr->id->name, path, err, strerror(err));
 898                 } else if (m->overlay) {
 899                         err = check_extroot(path);
 900                         if (err)
 901                                 umount(path);
 902                 }
 903         }
 904
 905         return err;
 906 }
 907
 908 static int main_extroot(int argc, char **argv)
 909 {
 910         struct blkid_struct_probe *pr;
 911         char fs[32] = { 0 };
 912         char fs_data[32] = { 0 };
 913         int err = -1;
 914
 915         if (!getenv("PREINIT"))
 916                 return -1;
 917
 918         if (argc != 2) {
 919                 fprintf(stderr, "Usage: block extroot mountpoint\n");
 920                 return -1;
 921         }
 922
 923         mkblkdev();
 924         cache_load(1);
 925
 926         find_block_mtd("rootfs", fs, sizeof(fs));
 927         if (!fs[0])
 928                 return -2;
 929
 930         pr = find_block_info(NULL, NULL, fs);
 931         if (!pr)
 932                 return -3;
 933
 934         find_block_mtd("rootfs_data", fs_data, sizeof(fs_data));
 935         if (fs_data[0]) {
 936                 pr = find_block_info(NULL, NULL, fs_data);
 937                 if (pr && !strcmp(pr->id->name, "jffs2")) {
 938                         char cfg[] = "/tmp/jffs_cfg";
 939
 940                         mkdir_p(cfg);
 941                         if (!mount(fs_data, cfg, "jffs2", MS_NOATIME, NULL)) {
 942                                 err = mount_extroot(cfg);
 943                                 umount2(cfg, MNT_DETACH);
 944                         }
 945                         if (err < 0)
 946                                 rmdir("/tmp/overlay");
 947                         rmdir(cfg);
 948                         return err;
 949                 }
 950         }
 951
 952         return mount_extroot(NULL);
 953 }
 954
 955 static int main_mount(int argc, char **argv)
 956 {
 957         struct blkid_struct_probe *pr;
 958
 959         if (config_load(NULL))
 960                 return -1;
 961
 962         cache_load(1);
 963         list_for_each_entry(pr, &devices, list)
 964                 mount_device(pr, 0);
 965
 966         handle_swapfiles(true);
 967
 968         return 0;
 969 }
 970
 971 static int main_umount(int argc, char **argv)
 972 {
 973         struct blkid_struct_probe *pr;
 974
 975         if (config_load(NULL))
 976                 return -1;
 977
 978         handle_swapfiles(false);
 979
 980         cache_load(0);
 981         list_for_each_entry(pr, &devices, list)
 982                 umount_device(pr);
 983
 984         return 0;
 985 }
 986
 987 static int main_detect(int argc, char **argv)
 988 {
 989         struct blkid_struct_probe *pr;
 990
 991         cache_load(0);
 992         printf("config 'global'\n");
 993         printf("\toption\tanon_swap\t'0'\n");
 994         printf("\toption\tanon_mount\t'0'\n");
 995         printf("\toption\tauto_swap\t'1'\n");
 996         printf("\toption\tauto_mount\t'1'\n");
 997         printf("\toption\tdelay_root\t'5'\n");
 998         printf("\toption\tcheck_fs\t'0'\n\n");
 999         list_for_each_entry(pr, &devices, list)
1000                 print_block_uci(pr);
1001
1002         return 0;
1003 }
1004
1005 static int main_info(int argc, char **argv)
1006 {
1007         int i;
1008         struct blkid_struct_probe *pr;
1009
1010         cache_load(1);
1011         if (argc == 2) {
1012                 list_for_each_entry(pr, &devices, list)
1013                         print_block_info(pr);
1014
1015                 return 0;
1016         };
1017
1018         for (i = 2; i < argc; i++) {
1019                 struct stat s;
1020
1021                 if (stat(argv[i], &s)) {
1022                         fprintf(stderr, "failed to stat %s\n", argv[i]);
1023                         continue;
1024                 }
1025                 if (!S_ISBLK(s.st_mode)) {
1026                         fprintf(stderr, "%s is not a block device\n", argv[i]);
1027                         continue;
1028                 }
1029                 pr = find_block_info(NULL, NULL, argv[i]);
1030                 if (pr)
1031                         print_block_info(pr);
1032         }
1033
1034         return 0;
1035 }
1036
1037 static int main_swapon(int argc, char **argv)
1038 {
1039         if (argc != 2) {
1040                 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");
1041                 return -1;
1042         }
1043
1044         if (!strcmp(argv[1], "-s")) {
1045                 FILE *fp = fopen("/proc/swaps", "r");
1046                 char *lineptr = NULL;
1047                 size_t s;
1048
1049                 if (!fp) {
1050                         fprintf(stderr, "failed to open /proc/swaps\n");
1051                         return -1;
1052                 }
1053                 while (getline(&lineptr, &s, fp) > 0)
1054                         printf(lineptr);
1055                 if (lineptr)
1056                         free(lineptr);
1057                 fclose(fp);
1058         } else if (!strcmp(argv[1], "-a")) {
1059                 struct blkid_struct_probe *pr;
1060
1061                 cache_load(0);
1062                 list_for_each_entry(pr, &devices, list) {
1063                         if (strcmp(pr->id->name, "swap"))
1064                                 continue;
1065                         if (swapon(pr->dev, 0))
1066                                 fprintf(stderr, "failed to swapon %s\n", pr->dev);
1067                 }
1068         } else {
1069                 struct stat s;
1070                 int err;
1071
1072                 if (stat(argv[1], &s) || (!S_ISBLK(s.st_mode) && !S_ISREG(s.st_mode))) {
1073                         fprintf(stderr, "%s is not a block device or file\n", argv[1]);
1074                         return -1;
1075                 }
1076                 err = swapon(argv[1], 0);
1077                 if (err) {
1078                         fprintf(stderr, "failed to swapon %s (%d)\n", argv[1], err);
1079                         return err;
1080                 }
1081         }
1082
1083         return 0;
1084 }
1085
1086 static int main_swapoff(int argc, char **argv)
1087 {
1088         if (argc != 2) {
1089                 fprintf(stderr, "Usage: swapoff [-a] [DEVICE]\n\n\tStop swapping on DEVICE\n -a\tStop swapping on all swap devices\n");
1090                 return -1;
1091         }
1092
1093         if (!strcmp(argv[1], "-a")) {
1094                 FILE *fp = fopen("/proc/swaps", "r");
1095                 char line[256];
1096
1097                 if (!fp) {
1098                         fprintf(stderr, "failed to open /proc/swaps\n");
1099                         return -1;
1100                 }
1101                 fgets(line, sizeof(line), fp);
1102                 while (fgets(line, sizeof(line), fp)) {
1103                         char *end = strchr(line, ' ');
1104                         int err;
1105
1106                         if (!end)
1107                                 continue;
1108                         *end = '\0';
1109                         err = swapoff(line);
1110                         if (err)
1111                                 fprintf(stderr, "failed to swapoff %s (%d)\n", line, err);
1112                 }
1113                 fclose(fp);
1114         } else {
1115                 struct stat s;
1116                 int err;
1117
1118                 if (stat(argv[1], &s) || (!S_ISBLK(s.st_mode) && !S_ISREG(s.st_mode))) {
1119                         fprintf(stderr, "%s is not a block device or file\n", argv[1]);
1120                         return -1;
1121                 }
1122                 err = swapoff(argv[1]);
1123                 if (err) {
1124                         fprintf(stderr, "fsiled to swapoff %s (%d)\n", argv[1], err);
1125                         return err;
1126                 }
1127         }
1128
1129         return 0;
1130 }
1131
1132 int main(int argc, char **argv)
1133 {
1134         char *base = basename(*argv);
1135
1136         umask(0);
1137
1138         if (!strcmp(base, "swapon"))
1139                 return main_swapon(argc, argv);
1140
1141         if (!strcmp(base, "swapoff"))
1142                 return main_swapoff(argc, argv);
1143
1144         if ((argc > 1) && !strcmp(base, "block")) {
1145                 if (!strcmp(argv[1], "info"))
1146                         return main_info(argc, argv);
1147
1148                 if (!strcmp(argv[1], "detect"))
1149                         return main_detect(argc, argv);
1150
1151                 if (!strcmp(argv[1], "hotplug"))
1152                         return main_hotplug(argc, argv);
1153
1154                 if (!strcmp(argv[1], "extroot"))
1155                         return main_extroot(argc, argv);
1156
1157                 if (!strcmp(argv[1], "mount"))
1158                         return main_mount(argc, argv);
1159
1160                 if (!strcmp(argv[1], "umount"))
1161                         return main_umount(argc, argv);
1162         }
1163
1164         fprintf(stderr, "Usage: block <info|mount|umount|detect>\n");
1165
1166         return -1;
1167 }