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                 vlist_add(&mounts, &m->node, (m->uuid) ? (m->uuid) : (m->device));
 306         }
 307
 308         return 0;
 309 }
 310
 311 static int global_add(struct uci_section *s)
 312 {
 313         struct blob_attr *tb[__CFG_MAX] = { 0 };
 314
 315         blob_buf_init(&b, 0);
 316         uci_to_blob(&b, s, &config_attr_list);
 317         blobmsg_parse(config_policy, __CFG_MAX, tb, blob_data(b.head), blob_len(b.head));
 318
 319         if ((tb[CFG_ANON_MOUNT]) && blobmsg_get_u32(tb[CFG_ANON_MOUNT]))
 320                 anon_mount = 1;
 321         if ((tb[CFG_ANON_SWAP]) && blobmsg_get_u32(tb[CFG_ANON_SWAP]))
 322                 anon_swap = 1;
 323
 324         if ((tb[CFG_AUTO_MOUNT]) && blobmsg_get_u32(tb[CFG_AUTO_MOUNT]))
 325                 auto_mount = 1;
 326         if ((tb[CFG_AUTO_SWAP]) && blobmsg_get_u32(tb[CFG_AUTO_SWAP]))
 327                 auto_swap = 1;
 328
 329         if (tb[CFG_DELAY_ROOT])
 330                 delay_root = blobmsg_get_u32(tb[CFG_DELAY_ROOT]);
 331
 332         if ((tb[CFG_CHECK_FS]) && blobmsg_get_u32(tb[CFG_CHECK_FS]))
 333                 check_fs = 1;
 334
 335         return 0;
 336 }
 337
 338 static struct mount* find_swap(const char *uuid, const char *label, const char *device)
 339 {
 340         struct mount *m;
 341
 342         vlist_for_each_element(&mounts, m, node) {
 343                 if (m->type != TYPE_SWAP)
 344                         continue;
 345                 if (uuid && m->uuid && !strcmp(m->uuid, uuid))
 346                         return m;
 347                 if (label && m->label && !strcmp(m->label, label))
 348                         return m;
 349                 if (device && m->device && !strcmp(m->device, device))
 350                         return m;
 351         }
 352
 353         return NULL;
 354 }
 355
 356 static struct mount* find_block(const char *uuid, const char *label, const char *device,
 357                                 const char *target)
 358 {
 359         struct mount *m;
 360
 361         vlist_for_each_element(&mounts, m, node) {
 362                 if (m->type != TYPE_MOUNT)
 363                         continue;
 364                 if (m->uuid && uuid && !strcmp(m->uuid, uuid))
 365                         return m;
 366                 if (m->label && label && !strcmp(m->label, label))
 367                         return m;
 368                 if (m->target && target && !strcmp(m->target, target))
 369                         return m;
 370                 if (m->device && device && !strcmp(m->device, device))
 371                         return m;
 372         }
 373
 374         return NULL;
 375 }
 376
 377 static void mounts_update(struct vlist_tree *tree, struct vlist_node *node_new,
 378                           struct vlist_node *node_old)
 379 {
 380 }
 381
 382 static int config_load(char *cfg)
 383 {
 384         struct uci_context *ctx;
 385         struct uci_package *pkg;
 386         struct uci_element *e;
 387
 388         vlist_init(&mounts, avl_strcmp, mounts_update);
 389
 390         ctx = uci_alloc_context();
 391         if (cfg) {
 392                 char path[32];
 393                 snprintf(path, 32, "%s/etc/config", cfg);
 394                 uci_set_confdir(ctx, path);
 395         }
 396
 397         if (uci_load(ctx, "fstab", &pkg))
 398                 return -1;
 399
 400         vlist_update(&mounts);
 401         uci_foreach_element(&pkg->sections, e) {
 402                 struct uci_section *s = uci_to_section(e);
 403
 404                 if (!strcmp(s->type, "mount"))
 405                         mount_add(s);
 406                 if (!strcmp(s->type, "swap"))
 407                         swap_add(s);
 408                 if (!strcmp(s->type, "global"))
 409                         global_add(s);
 410         }
 411         vlist_flush(&mounts);
 412
 413         return 0;
 414 }
 415
 416 static struct blkid_struct_probe* _probe_path(char *path)
 417 {
 418         struct blkid_struct_probe *pr;
 419
 420         pr = malloc(sizeof(*pr));
 421
 422         if (!pr)
 423                 return NULL;
 424
 425         memset(pr, 0, sizeof(*pr));
 426         probe_block(path, pr);
 427
 428         if (pr->err || !pr->id) {
 429                 free(pr);
 430                 return NULL;
 431         }
 432
 433         return pr;
 434 }
 435
 436 static int _cache_load(const char *path)
 437 {
 438         int gl_flags = GLOB_NOESCAPE | GLOB_MARK;
 439         int j;
 440         glob_t gl;
 441
 442         if (glob(path, gl_flags, NULL, &gl) < 0)
 443                 return -1;
 444
 445         for (j = 0; j < gl.gl_pathc; j++) {
 446                 struct blkid_struct_probe *pr = _probe_path(gl.gl_pathv[j]);
 447                 if (pr)
 448                         list_add_tail(&pr->list, &devices);
 449         }
 450
 451         globfree(&gl);
 452
 453         return 0;
 454 }
 455
 456 static void cache_load(int mtd)
 457 {
 458         if (mtd)
 459                 _cache_load("/dev/mtdblock*");
 460         _cache_load("/dev/mmcblk*");
 461         _cache_load("/dev/sd*");
 462         _cache_load("/dev/sdc*");
 463         _cache_load("/dev/hd*");
 464         _cache_load("/dev/md*");
 465         _cache_load("/dev/mapper/*");
 466 }
 467
 468 static int print_block_info(struct blkid_struct_probe *pr)
 469 {
 470         printf("%s:", pr->dev);
 471         if (pr->uuid[0])
 472                 printf(" UUID=\"%s\"", pr->uuid);
 473
 474         if (pr->label[0])
 475                 printf(" LABEL=\"%s\"", pr->label);
 476
 477         if (pr->name[0])
 478                 printf(" NAME=\"%s\"", pr->name);
 479
 480         if (pr->version[0])
 481                 printf(" VERSION=\"%s\"", pr->version);
 482
 483         printf(" TYPE=\"%s\"\n", pr->id->name);
 484
 485         return 0;
 486 }
 487
 488 static int print_block_uci(struct blkid_struct_probe *pr)
 489 {
 490         if (!strcmp(pr->id->name, "swap")) {
 491                 printf("config 'swap'\n");
 492         } else {
 493                 printf("config 'mount'\n");
 494                 printf("\toption\ttarget\t'/mnt/%s'\n", basename(pr->dev));
 495         }
 496         if (pr->uuid[0])
 497                 printf("\toption\tuuid\t'%s'\n", pr->uuid);
 498         else
 499                 printf("\toption\tdevice\t'%s'\n", pr->dev);
 500         printf("\toption\tenabled\t'0'\n\n");
 501
 502         return 0;
 503 }
 504
 505 static struct blkid_struct_probe* find_block_info(char *uuid, char *label, char *path)
 506 {
 507         struct blkid_struct_probe *pr = NULL;
 508
 509         if (uuid)
 510                 list_for_each_entry(pr, &devices, list)
 511                         if (!strcmp(pr->uuid, uuid))
 512                                 return pr;
 513
 514         if (label)
 515                 list_for_each_entry(pr, &devices, list)
 516                         if (strcmp(pr->label, label))
 517                                 return pr;
 518
 519         if (path)
 520                 list_for_each_entry(pr, &devices, list)
 521                         if (!strcmp(pr->dev, path))
 522                                 return pr;
 523
 524         return NULL;
 525 }
 526
 527 static char* find_mount_point(char *block)
 528 {
 529         FILE *fp = fopen("/proc/mounts", "r");
 530         static char line[256];
 531         int len = strlen(block);
 532         char *point = NULL;
 533
 534         if(!fp)
 535                 return NULL;
 536
 537         while (fgets(line, sizeof(line), fp)) {
 538                 if (!strncmp(line, block, len)) {
 539                         char *p = &line[len + 1];
 540                         char *t = strstr(p, " ");
 541
 542                         if (!t)
 543                                 return NULL;
 544                         *t = '\0';
 545                         point = p;
 546                         break;
 547                 }
 548         }
 549
 550         fclose(fp);
 551
 552         return point;
 553 }
 554
 555 static void mkdir_p(char *dir)
 556 {
 557         char *l = strrchr(dir, '/');
 558
 559         if (l) {
 560                 *l = '\0';
 561                 mkdir_p(dir);
 562                 *l = '/';
 563                 mkdir(dir, 0755);
 564         }
 565 }
 566
 567 static void check_filesystem(struct blkid_struct_probe *pr)
 568 {
 569         pid_t pid;
 570         struct stat statbuf;
 571         char *e2fsck = "/usr/sbin/e2fsck";
 572
 573         if (strncmp(pr->id->name, "ext", 3)) {
 574                 fprintf(stderr, "check_filesystem: %s is not supported\n", pr->id->name);
 575                 return;
 576         }
 577
 578         if (stat(e2fsck, &statbuf) < 0) {
 579                 fprintf(stderr, "check_filesystem: %s not found\n", e2fsck);
 580                 return;
 581         }
 582
 583         pid = fork();
 584         if (!pid) {
 585                 execl(e2fsck, e2fsck, "-p", pr->dev, NULL);
 586                 exit(-1);
 587         } else if (pid > 0) {
 588                 int status;
 589
 590                 waitpid(pid, &status, 0);
 591                 if (WEXITSTATUS(status))
 592                         fprintf(stderr, "check_filesystem: %s returned %d\n", e2fsck, WEXITSTATUS(status));
 593         }
 594 }
 595
 596 static void handle_swapfiles(bool on)
 597 {
 598         struct stat s;
 599         struct mount *m;
 600         struct blkid_struct_probe *pr;
 601
 602         vlist_for_each_element(&mounts, m, node)
 603         {
 604                 if (m->type != TYPE_SWAP || !m->target)
 605                         continue;
 606
 607                 if (stat(m->target, &s) || !S_ISREG(s.st_mode))
 608                         continue;
 609
 610                 pr = _probe_path(m->target);
 611
 612                 if (!pr)
 613                         continue;
 614
 615                 if (!strcmp(pr->id->name, "swap")) {
 616                         if (on)
 617                                 swapon(pr->dev, m->prio);
 618                         else
 619                                 swapoff(pr->dev);
 620                 }
 621
 622                 free(pr);
 623         }
 624 }
 625
 626 static int mount_device(struct blkid_struct_probe *pr, int hotplug)
 627 {
 628         struct mount *m;
 629         char *device;
 630
 631         if (!pr)
 632                 return -1;
 633
 634         device = basename(pr->dev);
 635
 636         if (!strcmp(pr->id->name, "swap")) {
 637                 if (hotplug && !auto_swap)
 638                         return -1;
 639                 m = find_swap(pr->uuid, pr->label, device);
 640                 if (m || anon_swap)
 641                         swapon(pr->dev, (m) ? (m->prio) : (0));
 642
 643                 return 0;
 644         }
 645
 646         if (hotplug && !auto_mount)
 647                 return -1;
 648
 649         if (find_mount_point(pr->dev)) {
 650                 fprintf(stderr, "%s is already mounted\n", pr->dev);
 651                 return -1;
 652         }
 653
 654         m = find_block(pr->uuid, pr->label, device, NULL);
 655         if (m && m->extroot)
 656                 return -1;
 657
 658         if (m) {
 659                 char *target = m->target;
 660                 char _target[32];
 661                 int err = 0;
 662
 663                 if (!target) {
 664                         snprintf(_target, sizeof(_target), "/mnt/%s", device);
 665                         target = _target;
 666                 }
 667                 mkdir_p(target);
 668
 669                 if (check_fs)
 670                         check_filesystem(pr);
 671
 672                 err = mount(pr->dev, target, pr->id->name, m->flags,
 673                             (m->options) ? (m->options) : (""));
 674                 if (err)
 675                         fprintf(stderr, "mounting %s (%s) as %s failed (%d) - %s\n",
 676                                         pr->dev, pr->id->name, target, err, strerror(err));
 677                 else
 678                         handle_swapfiles(true);
 679                 return err;
 680         }
 681
 682         if (anon_mount) {
 683                 char target[] = "/mnt/mmcblk123";
 684                 int err = 0;
 685
 686                 snprintf(target, sizeof(target), "/mnt/%s", device);
 687                 mkdir_p(target);
 688
 689                 if (check_fs)
 690                         check_filesystem(pr);
 691
 692                 err = mount(pr->dev, target, pr->id->name, 0, "");
 693                 if (err)
 694                         fprintf(stderr, "mounting %s (%s) as %s failed (%d) - %s\n",
 695                                         pr->dev, pr->id->name, target, err, strerror(err));
 696                 else
 697                         handle_swapfiles(true);
 698                 return err;
 699         }
 700
 701         return 0;
 702 }
 703
 704 static int umount_device(struct blkid_struct_probe *pr)
 705 {
 706         struct mount *m;
 707         char *device = basename(pr->dev);
 708         char *mp;
 709         int err;
 710
 711         if (!pr)
 712                 return -1;
 713
 714         if (!strcmp(pr->id->name, "swap"))
 715                 return -1;
 716
 717         mp = find_mount_point(pr->dev);
 718         if (!mp)
 719                 return -1;
 720
 721         m = find_block(pr->uuid, pr->label, device, NULL);
 722         if (m && m->extroot)
 723                 return -1;
 724
 725         err = umount2(mp, MNT_DETACH);
 726         if (err)
 727                 fprintf(stderr, "unmounting %s (%s)  failed (%d) - %s\n",
 728                         pr->dev, mp, err, strerror(err));
 729         else
 730                 fprintf(stderr, "unmounted %s (%s)\n",
 731                         pr->dev, mp);
 732
 733         return err;
 734 }
 735
 736 static int main_hotplug(int argc, char **argv)
 737 {
 738         char path[32];
 739         char *action, *device, *mount_point;
 740
 741         action = getenv("ACTION");
 742         device = getenv("DEVNAME");
 743
 744         if (!action || !device)
 745                 return -1;
 746         snprintf(path, sizeof(path), "/dev/%s", device);
 747
 748         if (!strcmp(action, "remove")) {
 749                 int err = 0;
 750                 mount_point = find_mount_point(path);
 751                 if (mount_point)
 752                         err = umount2(mount_point, MNT_DETACH);
 753
 754                 if (err)
 755                         fprintf(stderr, "umount of %s failed (%d) - %s\n",
 756                                         mount_point, err, strerror(err));
 757
 758                 return 0;
 759         } else if (strcmp(action, "add")) {
 760                 fprintf(stderr, "Unkown action %s\n", action);
 761
 762                 return -1;
 763         }
 764
 765         if (config_load(NULL))
 766                 return -1;
 767         cache_load(0);
 768
 769         return mount_device(find_block_info(NULL, NULL, path), 1);
 770 }
 771
 772 static int find_block_mtd(char *name, char *part, int plen)
 773 {
 774         FILE *fp = fopen("/proc/mtd", "r");
 775         static char line[256];
 776         char *index = NULL;
 777
 778         if(!fp)
 779                 return -1;
 780
 781         while (!index && fgets(line, sizeof(line), fp)) {
 782                 if (strstr(line, name)) {
 783                         char *eol = strstr(line, ":");
 784
 785                         if (!eol)
 786                                 continue;
 787
 788                         *eol = '\0';
 789                         index = &line[3];
 790                 }
 791         }
 792
 793         fclose(fp);
 794
 795         if (!index)
 796                 return -1;
 797
 798         snprintf(part, plen, "/dev/mtdblock%s", index);
 799
 800         return 0;
 801 }
 802
 803 static int check_extroot(char *path)
 804 {
 805         struct blkid_struct_probe *pr = NULL;
 806         char fs[32];
 807
 808         if (find_block_mtd("rootfs", fs, sizeof(fs)))
 809                 return -1;
 810
 811         list_for_each_entry(pr, &devices, list) {
 812                 if (!strcmp(pr->dev, fs)) {
 813                         struct stat s;
 814                         FILE *fp = NULL;
 815                         char tag[64];
 816                         char uuid[64] = { 0 };
 817
 818                         snprintf(tag, sizeof(tag), "%s/etc/.extroot-uuid", path);
 819                         if (stat(tag, &s)) {
 820                                 fp = fopen(tag, "w+");
 821                                 if (!fp) {
 822                                         fprintf(stderr, "extroot: failed to write uuid tag file\n");
 823                                         /* return 0 to continue boot regardless of error */
 824                                         return 0;
 825                                 }
 826                                 fputs(pr->uuid, fp);
 827                                 fclose(fp);
 828                                 return 0;
 829                         }
 830
 831                         fp = fopen(tag, "r");
 832                         if (!fp) {
 833                                 fprintf(stderr, "extroot: failed to open uuid tag file\n");
 834                                 return -1;
 835                         }
 836
 837                         fgets(uuid, sizeof(uuid), fp);
 838                         fclose(fp);
 839                         if (!strcmp(uuid, pr->uuid))
 840                                 return 0;
 841                         fprintf(stderr, "extroot: uuid tag does not match rom uuid\n");
 842                 }
 843         }
 844         return -1;
 845 }
 846
 847 static int mount_extroot(char *cfg)
 848 {
 849         char overlay[] = "/tmp/extroot/overlay";
 850         char mnt[] = "/tmp/extroot/mnt";
 851         char *path = mnt;
 852         struct blkid_struct_probe *pr;
 853         struct mount *m;
 854         int err = -1;
 855
 856         if (config_load(cfg))
 857                 return -2;
 858
 859         m = find_block(NULL, NULL, NULL, "/");
 860         if (!m)
 861                 m = find_block(NULL, NULL, NULL, "/overlay");
 862
 863         if (!m || !m->extroot)
 864                 return -1;
 865
 866         pr = find_block_info(m->uuid, m->label, NULL);
 867
 868         if (!pr && delay_root){
 869                 fprintf(stderr, "extroot: is not ready yet, retrying in %u seconds\n", delay_root);
 870                 sleep(delay_root);
 871                 mkblkdev();
 872                 cache_load(0);
 873                 pr = find_block_info(m->uuid, m->label, NULL);
 874         }
 875         if (pr) {
 876                 if (strncmp(pr->id->name, "ext", 3)) {
 877                         fprintf(stderr, "extroot: %s is not supported, try ext4\n", pr->id->name);
 878                         return -1;
 879                 }
 880                 if (m->overlay)
 881                         path = overlay;
 882                 mkdir_p(path);
 883
 884                 if (check_fs)
 885                         check_filesystem(pr);
 886
 887                 err = mount(pr->dev, path, pr->id->name, 0, (m->options) ? (m->options) : (""));
 888
 889                 if (err) {
 890                         fprintf(stderr, "mounting %s (%s) as %s failed (%d) - %s\n",
 891                                         pr->dev, pr->id->name, path, err, strerror(err));
 892                 } else if (m->overlay) {
 893                         err = check_extroot(path);
 894                         if (err)
 895                                 umount(path);
 896                 }
 897         }
 898
 899         return err;
 900 }
 901
 902 static int main_extroot(int argc, char **argv)
 903 {
 904         struct blkid_struct_probe *pr;
 905         char fs[32] = { 0 };
 906         char fs_data[32] = { 0 };
 907         int err = -1;
 908
 909         if (!getenv("PREINIT"))
 910                 return -1;
 911
 912         if (argc != 2) {
 913                 fprintf(stderr, "Usage: block extroot mountpoint\n");
 914                 return -1;
 915         }
 916
 917         mkblkdev();
 918         cache_load(1);
 919
 920         find_block_mtd("rootfs", fs, sizeof(fs));
 921         if (!fs[0])
 922                 return -2;
 923
 924         pr = find_block_info(NULL, NULL, fs);
 925         if (!pr)
 926                 return -3;
 927
 928         find_block_mtd("rootfs_data", fs_data, sizeof(fs_data));
 929         if (fs_data[0]) {
 930                 pr = find_block_info(NULL, NULL, fs_data);
 931                 if (pr && !strcmp(pr->id->name, "jffs2")) {
 932                         char cfg[] = "/tmp/jffs_cfg";
 933
 934                         mkdir_p(cfg);
 935                         if (!mount(fs_data, cfg, "jffs2", MS_NOATIME, NULL)) {
 936                                 err = mount_extroot(cfg);
 937                                 umount2(cfg, MNT_DETACH);
 938                         }
 939                         if (err < 0)
 940                                 rmdir("/tmp/overlay");
 941                         rmdir(cfg);
 942                         return err;
 943                 }
 944         }
 945
 946         return mount_extroot(NULL);
 947 }
 948
 949 static int main_mount(int argc, char **argv)
 950 {
 951         struct blkid_struct_probe *pr;
 952
 953         if (config_load(NULL))
 954                 return -1;
 955
 956         cache_load(1);
 957         list_for_each_entry(pr, &devices, list)
 958                 mount_device(pr, 0);
 959
 960         handle_swapfiles(true);
 961
 962         return 0;
 963 }
 964
 965 static int main_umount(int argc, char **argv)
 966 {
 967         struct blkid_struct_probe *pr;
 968
 969         if (config_load(NULL))
 970                 return -1;
 971
 972         handle_swapfiles(false);
 973
 974         cache_load(0);
 975         list_for_each_entry(pr, &devices, list)
 976                 umount_device(pr);
 977
 978         return 0;
 979 }
 980
 981 static int main_detect(int argc, char **argv)
 982 {
 983         struct blkid_struct_probe *pr;
 984
 985         cache_load(0);
 986         printf("config 'global'\n");
 987         printf("\toption\tanon_swap\t'0'\n");
 988         printf("\toption\tanon_mount\t'0'\n");
 989         printf("\toption\tauto_swap\t'1'\n");
 990         printf("\toption\tauto_mount\t'1'\n");
 991         printf("\toption\tdelay_root\t'5'\n");
 992         printf("\toption\tcheck_fs\t'0'\n\n");
 993         list_for_each_entry(pr, &devices, list)
 994                 print_block_uci(pr);
 995
 996         return 0;
 997 }
 998
 999 static int main_info(int argc, char **argv)
1000 {
1001         int i;
1002         struct blkid_struct_probe *pr;
1003
1004         cache_load(1);
1005         if (argc == 2) {
1006                 list_for_each_entry(pr, &devices, list)
1007                         print_block_info(pr);
1008
1009                 return 0;
1010         };
1011
1012         for (i = 2; i < argc; i++) {
1013                 struct stat s;
1014
1015                 if (stat(argv[i], &s)) {
1016                         fprintf(stderr, "failed to stat %s\n", argv[i]);
1017                         continue;
1018                 }
1019                 if (!S_ISBLK(s.st_mode)) {
1020                         fprintf(stderr, "%s is not a block device\n", argv[i]);
1021                         continue;
1022                 }
1023                 pr = find_block_info(NULL, NULL, argv[i]);
1024                 if (pr)
1025                         print_block_info(pr);
1026         }
1027
1028         return 0;
1029 }
1030
1031 static int main_swapon(int argc, char **argv)
1032 {
1033         if (argc != 2) {
1034                 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");
1035                 return -1;
1036         }
1037
1038         if (!strcmp(argv[1], "-s")) {
1039                 FILE *fp = fopen("/proc/swaps", "r");
1040                 char *lineptr = NULL;
1041                 size_t s;
1042
1043                 if (!fp) {
1044                         fprintf(stderr, "failed to open /proc/swaps\n");
1045                         return -1;
1046                 }
1047                 while (getline(&lineptr, &s, fp) > 0)
1048                         printf(lineptr);
1049                 if (lineptr)
1050                         free(lineptr);
1051                 fclose(fp);
1052         } else if (!strcmp(argv[1], "-a")) {
1053                 struct blkid_struct_probe *pr;
1054
1055                 cache_load(0);
1056                 list_for_each_entry(pr, &devices, list) {
1057                         if (strcmp(pr->id->name, "swap"))
1058                                 continue;
1059                         if (swapon(pr->dev, 0))
1060                                 fprintf(stderr, "failed to swapon %s\n", pr->dev);
1061                 }
1062         } else {
1063                 struct stat s;
1064                 int err;
1065
1066                 if (stat(argv[1], &s) || (!S_ISBLK(s.st_mode) && !S_ISREG(s.st_mode))) {
1067                         fprintf(stderr, "%s is not a block device or file\n", argv[1]);
1068                         return -1;
1069                 }
1070                 err = swapon(argv[1], 0);
1071                 if (err) {
1072                         fprintf(stderr, "failed to swapon %s (%d)\n", argv[1], err);
1073                         return err;
1074                 }
1075         }
1076
1077         return 0;
1078 }
1079
1080 static int main_swapoff(int argc, char **argv)
1081 {
1082         if (argc != 2) {
1083                 fprintf(stderr, "Usage: swapoff [-a] [DEVICE]\n\n\tStop swapping on DEVICE\n -a\tStop swapping on all swap devices\n");
1084                 return -1;
1085         }
1086
1087         if (!strcmp(argv[1], "-a")) {
1088                 FILE *fp = fopen("/proc/swaps", "r");
1089                 char line[256];
1090
1091                 if (!fp) {
1092                         fprintf(stderr, "failed to open /proc/swaps\n");
1093                         return -1;
1094                 }
1095                 fgets(line, sizeof(line), fp);
1096                 while (fgets(line, sizeof(line), fp)) {
1097                         char *end = strchr(line, ' ');
1098                         int err;
1099
1100                         if (!end)
1101                                 continue;
1102                         *end = '\0';
1103                         err = swapoff(line);
1104                         if (err)
1105                                 fprintf(stderr, "failed to swapoff %s (%d)\n", line, err);
1106                 }
1107                 fclose(fp);
1108         } else {
1109                 struct stat s;
1110                 int err;
1111
1112                 if (stat(argv[1], &s) || (!S_ISBLK(s.st_mode) && !S_ISREG(s.st_mode))) {
1113                         fprintf(stderr, "%s is not a block device or file\n", argv[1]);
1114                         return -1;
1115                 }
1116                 err = swapoff(argv[1]);
1117                 if (err) {
1118                         fprintf(stderr, "fsiled to swapoff %s (%d)\n", argv[1], err);
1119                         return err;
1120                 }
1121         }
1122
1123         return 0;
1124 }
1125
1126 int main(int argc, char **argv)
1127 {
1128         char *base = basename(*argv);
1129
1130         umask(0);
1131
1132         if (!strcmp(base, "swapon"))
1133                 return main_swapon(argc, argv);
1134
1135         if (!strcmp(base, "swapoff"))
1136                 return main_swapoff(argc, argv);
1137
1138         if ((argc > 1) && !strcmp(base, "block")) {
1139                 if (!strcmp(argv[1], "info"))
1140                         return main_info(argc, argv);
1141
1142                 if (!strcmp(argv[1], "detect"))
1143                         return main_detect(argc, argv);
1144
1145                 if (!strcmp(argv[1], "hotplug"))
1146                         return main_hotplug(argc, argv);
1147
1148                 if (!strcmp(argv[1], "extroot"))
1149                         return main_extroot(argc, argv);
1150
1151                 if (!strcmp(argv[1], "mount"))
1152                         return main_mount(argc, argv);
1153
1154                 if (!strcmp(argv[1], "umount"))
1155                         return main_umount(argc, argv);
1156         }
1157
1158         fprintf(stderr, "Usage: block <info|mount|umount|detect>\n");
1159
1160         return -1;
1161 }