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