block.c

   1 /*
   2  * Copyright (C) 2013 Felix Fietkau <nbd@openwrt.org>
   3  * Copyright (C) 2013 John Crispin <blogic@openwrt.org>
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU Lesser General Public License version 2.1
   7  * as published by the Free Software Foundation
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  */
  14
  15 #define _GNU_SOURCE
  16 #include <getopt.h>
  17 #include <stdio.h>
  18 #include <unistd.h>
  19 #include <syslog.h>
  20 #include <libgen.h>
  21 #include <glob.h>
  22
  23 #include <sys/stat.h>
  24 #include <sys/types.h>
  25 #include <sys/swap.h>
  26 #include <sys/mount.h>
  27 #include <sys/wait.h>
  28
  29 #include <uci.h>
  30 #include <uci_blob.h>
  31
  32 #include <libubox/list.h>
  33 #include <libubox/vlist.h>
  34 #include <libubox/blobmsg_json.h>
  35 #include <libubox/avl-cmp.h>
  36
  37 #include "libblkid-tiny/libblkid-tiny.h"
  38
  39 #ifdef UBIFS_EXTROOT
  40 #include "libubi/libubi.h"
  41 #endif
  42
  43 #define ERROR(fmt, ...) do { \
  44                 syslog(LOG_ERR, fmt, ## __VA_ARGS__); \
  45                 fprintf(stderr, "block: "fmt, ## __VA_ARGS__); \
  46         } while (0)
  47
  48 enum {
  49         TYPE_MOUNT,
  50         TYPE_SWAP,
  51 };
  52
  53 struct mount {
  54         struct vlist_node node;
  55         int type;
  56
  57         char *target;
  58         char *path;
  59         char *options;
  60         uint32_t flags;
  61         char *uuid;
  62         char *label;
  63         char *device;
  64         int extroot;
  65         int overlay;
  66         int disabled_fsck;
  67         unsigned int prio;
  68 };
  69
  70 static struct vlist_tree mounts;
  71 static struct blob_buf b;
  72 static LIST_HEAD(devices);
  73 static int anon_mount, anon_swap, auto_mount, auto_swap, check_fs;
  74 static unsigned int delay_root;
  75
  76 enum {
  77         CFG_ANON_MOUNT,
  78         CFG_ANON_SWAP,
  79         CFG_AUTO_MOUNT,
  80         CFG_AUTO_SWAP,
  81         CFG_DELAY_ROOT,
  82         CFG_CHECK_FS,
  83         __CFG_MAX
  84 };
  85
  86 static const struct blobmsg_policy config_policy[__CFG_MAX] = {
  87         [CFG_ANON_SWAP] = { .name = "anon_swap", .type = BLOBMSG_TYPE_INT32 },
  88         [CFG_ANON_MOUNT] = { .name = "anon_mount", .type = BLOBMSG_TYPE_INT32 },
  89         [CFG_AUTO_SWAP] = { .name = "auto_swap", .type = BLOBMSG_TYPE_INT32 },
  90         [CFG_AUTO_MOUNT] = { .name = "auto_mount", .type = BLOBMSG_TYPE_INT32 },
  91         [CFG_DELAY_ROOT] = { .name = "delay_root", .type = BLOBMSG_TYPE_INT32 },
  92         [CFG_CHECK_FS] = { .name = "check_fs", .type = BLOBMSG_TYPE_INT32 },
  93 };
  94
  95 enum {
  96         MOUNT_UUID,
  97         MOUNT_LABEL,
  98         MOUNT_ENABLE,
  99         MOUNT_TARGET,
 100         MOUNT_DEVICE,
 101         MOUNT_OPTIONS,
 102         __MOUNT_MAX
 103 };
 104
 105 static const struct uci_blob_param_list config_attr_list = {
 106         .n_params = __CFG_MAX,
 107         .params = config_policy,
 108 };
 109
 110 static const struct blobmsg_policy mount_policy[__MOUNT_MAX] = {
 111         [MOUNT_UUID] = { .name = "uuid", .type = BLOBMSG_TYPE_STRING },
 112         [MOUNT_LABEL] = { .name = "label", .type = BLOBMSG_TYPE_STRING },
 113         [MOUNT_DEVICE] = { .name = "device", .type = BLOBMSG_TYPE_STRING },
 114         [MOUNT_TARGET] = { .name = "target", .type = BLOBMSG_TYPE_STRING },
 115         [MOUNT_OPTIONS] = { .name = "options", .type = BLOBMSG_TYPE_STRING },
 116         [MOUNT_ENABLE] = { .name = "enabled", .type = BLOBMSG_TYPE_INT32 },
 117 };
 118
 119 static const struct uci_blob_param_list mount_attr_list = {
 120         .n_params = __MOUNT_MAX,
 121         .params = mount_policy,
 122 };
 123
 124 enum {
 125         SWAP_ENABLE,
 126         SWAP_UUID,
 127         SWAP_LABEL,
 128         SWAP_DEVICE,
 129         SWAP_PRIO,
 130         __SWAP_MAX
 131 };
 132
 133 static const struct blobmsg_policy swap_policy[__SWAP_MAX] = {
 134         [SWAP_ENABLE] = { .name = "enabled", .type = BLOBMSG_TYPE_INT32 },
 135         [SWAP_UUID] = { .name = "uuid", .type = BLOBMSG_TYPE_STRING },
 136         [SWAP_LABEL] = { .name = "label", .type = BLOBMSG_TYPE_STRING },
 137         [SWAP_DEVICE] = { .name = "device", .type = BLOBMSG_TYPE_STRING },
 138         [SWAP_PRIO] = { .name = "priority", .type = BLOBMSG_TYPE_INT32 },
 139 };
 140
 141 static const struct uci_blob_param_list swap_attr_list = {
 142         .n_params = __SWAP_MAX,
 143         .params = swap_policy,
 144 };
 145
 146 struct mount_flag {
 147         const char *name;
 148         int32_t flag;
 149 };
 150
 151 #ifndef MS_DIRSYNC
 152 #       define MS_DIRSYNC               (1 << 7)
 153 #endif
 154
 155 #ifndef MS_RELATIME
 156 #       define MS_RELATIME              (1 << 21)
 157 #endif
 158
 159 #ifndef MS_STRICTATIME
 160 #       define MS_STRICTATIME   (1 << 24)
 161 #endif
 162
 163 static const struct mount_flag mount_flags[] = {
 164         { "sync",               MS_SYNCHRONOUS  },
 165         { "async",              ~MS_SYNCHRONOUS },
 166         { "dirsync",            MS_DIRSYNC      },
 167         { "mand",               MS_MANDLOCK     },
 168         { "nomand",             ~MS_MANDLOCK    },
 169         { "atime",              ~MS_NOATIME     },
 170         { "noatime",            MS_NOATIME      },
 171         { "dev",                ~MS_NODEV       },
 172         { "nodev",              MS_NODEV        },
 173         { "diratime",           ~MS_NODIRATIME  },
 174         { "nodiratime",         MS_NODIRATIME   },
 175         { "exec",               ~MS_NOEXEC      },
 176         { "noexec",             MS_NOEXEC       },
 177         { "suid",               ~MS_NOSUID      },
 178         { "nosuid",             MS_NOSUID       },
 179         { "rw",                 ~MS_RDONLY      },
 180         { "ro",                 MS_RDONLY       },
 181         { "relatime",           MS_RELATIME     },
 182         { "norelatime",         ~MS_RELATIME    },
 183         { "strictatime",        MS_STRICTATIME  },
 184 };
 185
 186 static char *blobmsg_get_strdup(struct blob_attr *attr)
 187 {
 188         if (!attr)
 189                 return NULL;
 190
 191         return strdup(blobmsg_get_string(attr));
 192 }
 193
 194 static char *blobmsg_get_basename(struct blob_attr *attr)
 195 {
 196         if (!attr)
 197                 return NULL;
 198
 199         return strdup(basename(blobmsg_get_string(attr)));
 200 }
 201
 202 static void parse_mount_options(struct mount *m, char *optstr)
 203 {
 204         int i;
 205         bool is_flag;
 206         char *p, *opts, *last;
 207
 208         m->flags = 0;
 209         m->options = NULL;
 210
 211         if (!optstr || !*optstr)
 212                 return;
 213
 214         m->options = opts = calloc(1, strlen(optstr) + 1);
 215
 216         if (!m->options)
 217                 return;
 218
 219         p = last = optstr;
 220
 221         do {
 222                 p = strchr(p, ',');
 223
 224                 if (p)
 225                         *p++ = 0;
 226
 227                 for (i = 0, is_flag = false; i < ARRAY_SIZE(mount_flags); i++) {
 228                         if (!strcmp(last, mount_flags[i].name)) {
 229                                 if (mount_flags[i].flag < 0)
 230                                         m->flags &= (uint32_t)mount_flags[i].flag;
 231                                 else
 232                                         m->flags |= (uint32_t)mount_flags[i].flag;
 233                                 is_flag = true;
 234                                 break;
 235                         }
 236                 }
 237
 238                 if (!is_flag)
 239                         opts += sprintf(opts, "%s%s", (opts > m->options) ? "," : "", last);
 240
 241                 last = p;
 242
 243         } while (p);
 244
 245         free(optstr);
 246 }
 247
 248 static int mount_add(struct uci_section *s)
 249 {
 250         struct blob_attr *tb[__MOUNT_MAX] = { 0 };
 251         struct mount *m;
 252
 253         blob_buf_init(&b, 0);
 254         uci_to_blob(&b, s, &mount_attr_list);
 255         blobmsg_parse(mount_policy, __MOUNT_MAX, tb, blob_data(b.head), blob_len(b.head));
 256
 257         if (!tb[MOUNT_LABEL] && !tb[MOUNT_UUID] && !tb[MOUNT_DEVICE])
 258                 return -1;
 259
 260         if (tb[MOUNT_ENABLE] && !blobmsg_get_u32(tb[MOUNT_ENABLE]))
 261                 return -1;
 262
 263         m = malloc(sizeof(struct mount));
 264         m->type = TYPE_MOUNT;
 265         m->uuid = blobmsg_get_strdup(tb[MOUNT_UUID]);
 266         m->label = blobmsg_get_strdup(tb[MOUNT_LABEL]);
 267         m->target = blobmsg_get_strdup(tb[MOUNT_TARGET]);
 268         m->device = blobmsg_get_basename(tb[MOUNT_DEVICE]);
 269
 270         parse_mount_options(m, blobmsg_get_strdup(tb[MOUNT_OPTIONS]));
 271
 272         m->overlay = m->extroot = 0;
 273         if (m->target && !strcmp(m->target, "/"))
 274                 m->extroot = 1;
 275         if (m->target && !strcmp(m->target, "/overlay"))
 276                 m->extroot = m->overlay = 1;
 277
 278         if (m->uuid)
 279                 vlist_add(&mounts, &m->node, m->uuid);
 280         else if (m->label)
 281                 vlist_add(&mounts, &m->node, m->label);
 282         else if (m->device)
 283                 vlist_add(&mounts, &m->node, m->device);
 284
 285         return 0;
 286 }
 287
 288 static int swap_add(struct uci_section *s)
 289 {
 290         struct blob_attr *tb[__SWAP_MAX] = { 0 };
 291         struct mount *m;
 292
 293         blob_buf_init(&b, 0);
 294         uci_to_blob(&b, s, &swap_attr_list);
 295         blobmsg_parse(swap_policy, __SWAP_MAX, tb, blob_data(b.head), blob_len(b.head));
 296
 297         if (!tb[SWAP_UUID] && !tb[SWAP_LABEL] && !tb[SWAP_DEVICE])
 298                 return -1;
 299
 300         m = malloc(sizeof(struct mount));
 301         memset(m, 0, sizeof(struct mount));
 302         m->type = TYPE_SWAP;
 303         m->uuid = blobmsg_get_strdup(tb[SWAP_UUID]);
 304         m->label = blobmsg_get_strdup(tb[SWAP_LABEL]);
 305         m->device = blobmsg_get_basename(tb[SWAP_DEVICE]);
 306         if (tb[SWAP_PRIO])
 307                 m->prio = blobmsg_get_u32(tb[SWAP_PRIO]);
 308         if (m->prio)
 309                 m->prio = ((m->prio << SWAP_FLAG_PRIO_SHIFT) & SWAP_FLAG_PRIO_MASK) | SWAP_FLAG_PREFER;
 310
 311         if ((!tb[SWAP_ENABLE]) || blobmsg_get_u32(tb[SWAP_ENABLE])) {
 312                 /* store complete swap path */
 313                 if (tb[SWAP_DEVICE])
 314                         m->target = blobmsg_get_strdup(tb[SWAP_DEVICE]);
 315
 316                 if (m->uuid)
 317                         vlist_add(&mounts, &m->node, m->uuid);
 318                 else if (m->label)
 319                         vlist_add(&mounts, &m->node, m->label);
 320                 else if (m->device)
 321                         vlist_add(&mounts, &m->node, m->device);
 322         }
 323
 324         return 0;
 325 }
 326
 327 static int global_add(struct uci_section *s)
 328 {
 329         struct blob_attr *tb[__CFG_MAX] = { 0 };
 330
 331         blob_buf_init(&b, 0);
 332         uci_to_blob(&b, s, &config_attr_list);
 333         blobmsg_parse(config_policy, __CFG_MAX, tb, blob_data(b.head), blob_len(b.head));
 334
 335         if ((tb[CFG_ANON_MOUNT]) && blobmsg_get_u32(tb[CFG_ANON_MOUNT]))
 336                 anon_mount = 1;
 337         if ((tb[CFG_ANON_SWAP]) && blobmsg_get_u32(tb[CFG_ANON_SWAP]))
 338                 anon_swap = 1;
 339
 340         if ((tb[CFG_AUTO_MOUNT]) && blobmsg_get_u32(tb[CFG_AUTO_MOUNT]))
 341                 auto_mount = 1;
 342         if ((tb[CFG_AUTO_SWAP]) && blobmsg_get_u32(tb[CFG_AUTO_SWAP]))
 343                 auto_swap = 1;
 344
 345         if (tb[CFG_DELAY_ROOT])
 346                 delay_root = blobmsg_get_u32(tb[CFG_DELAY_ROOT]);
 347
 348         if ((tb[CFG_CHECK_FS]) && blobmsg_get_u32(tb[CFG_CHECK_FS]))
 349                 check_fs = 1;
 350
 351         return 0;
 352 }
 353
 354 static struct mount* find_swap(const char *uuid, const char *label, const char *device)
 355 {
 356         struct mount *m;
 357
 358         vlist_for_each_element(&mounts, m, node) {
 359                 if (m->type != TYPE_SWAP)
 360                         continue;
 361                 if (uuid && m->uuid && !strcasecmp(m->uuid, uuid))
 362                         return m;
 363                 if (label && m->label && !strcmp(m->label, label))
 364                         return m;
 365                 if (device && m->device && !strcmp(m->device, device))
 366                         return m;
 367         }
 368
 369         return NULL;
 370 }
 371
 372 static struct mount* find_block(const char *uuid, const char *label, const char *device,
 373                                 const char *target)
 374 {
 375         struct mount *m;
 376
 377         vlist_for_each_element(&mounts, m, node) {
 378                 if (m->type != TYPE_MOUNT)
 379                         continue;
 380                 if (m->uuid && uuid && !strcasecmp(m->uuid, uuid))
 381                         return m;
 382                 if (m->label && label && !strcmp(m->label, label))
 383                         return m;
 384                 if (m->target && target && !strcmp(m->target, target))
 385                         return m;
 386                 if (m->device && device && !strcmp(m->device, device))
 387                         return m;
 388         }
 389
 390         return NULL;
 391 }
 392
 393 static void mounts_update(struct vlist_tree *tree, struct vlist_node *node_new,
 394                           struct vlist_node *node_old)
 395 {
 396 }
 397
 398 static int config_load(char *cfg)
 399 {
 400         struct uci_context *ctx;
 401         struct uci_package *pkg;
 402         struct uci_element *e;
 403
 404         vlist_init(&mounts, avl_strcmp, mounts_update);
 405
 406         ctx = uci_alloc_context();
 407         if (cfg) {
 408                 char path[32];
 409                 snprintf(path, 32, "%s/etc/config", cfg);
 410                 uci_set_confdir(ctx, path);
 411         }
 412
 413         if (uci_load(ctx, "fstab", &pkg)) {
 414                 uci_set_confdir(ctx, "/etc/config");
 415                 if (uci_load(ctx, "fstab", &pkg)) {
 416                         char *err;
 417                         uci_get_errorstr(ctx, &err, "fstab");
 418                         ERROR("extroot: failed to load %s/etc/config/%s\n",
 419                               cfg ? cfg : "", err);
 420                         free(err);
 421                         return -1;
 422                 }
 423         }
 424
 425         vlist_update(&mounts);
 426         uci_foreach_element(&pkg->sections, e) {
 427                 struct uci_section *s = uci_to_section(e);
 428
 429                 if (!strcmp(s->type, "mount"))
 430                         mount_add(s);
 431                 if (!strcmp(s->type, "swap"))
 432                         swap_add(s);
 433                 if (!strcmp(s->type, "global"))
 434                         global_add(s);
 435         }
 436         vlist_flush(&mounts);
 437
 438         return 0;
 439 }
 440
 441 static struct blkid_struct_probe* _probe_path(char *path)
 442 {
 443         struct blkid_struct_probe *pr;
 444
 445         pr = malloc(sizeof(*pr));
 446
 447         if (!pr)
 448                 return NULL;
 449
 450         memset(pr, 0, sizeof(*pr));
 451         probe_block(path, pr);
 452
 453         if (pr->err || !pr->id) {
 454                 free(pr);
 455                 return NULL;
 456         }
 457
 458         return pr;
 459 }
 460
 461 static int _cache_load(const char *path)
 462 {
 463         int gl_flags = GLOB_NOESCAPE | GLOB_MARK;
 464         int j;
 465         glob_t gl;
 466
 467         if (glob(path, gl_flags, NULL, &gl) < 0)
 468                 return -1;
 469
 470         for (j = 0; j < gl.gl_pathc; j++) {
 471                 struct blkid_struct_probe *pr = _probe_path(gl.gl_pathv[j]);
 472                 if (pr)
 473                         list_add_tail(&pr->list, &devices);
 474         }
 475
 476         globfree(&gl);
 477
 478         return 0;
 479 }
 480
 481 static void cache_load(int mtd)
 482 {
 483         if (mtd) {
 484                 _cache_load("/dev/mtdblock*");
 485                 _cache_load("/dev/ubiblock*");
 486                 _cache_load("/dev/ubi?*_?*");
 487         }
 488         _cache_load("/dev/mmcblk*");
 489         _cache_load("/dev/sd*");
 490         _cache_load("/dev/hd*");
 491         _cache_load("/dev/md*");
 492         _cache_load("/dev/vd*");
 493         _cache_load("/dev/mapper/*");
 494 }
 495
 496 static int print_block_info(struct blkid_struct_probe *pr)
 497 {
 498         printf("%s:", pr->dev);
 499         if (pr->uuid[0])
 500                 printf(" UUID=\"%s\"", pr->uuid);
 501
 502         if (pr->label[0])
 503                 printf(" LABEL=\"%s\"", pr->label);
 504
 505         if (pr->name[0])
 506                 printf(" NAME=\"%s\"", pr->name);
 507
 508         if (pr->version[0])
 509                 printf(" VERSION=\"%s\"", pr->version);
 510
 511         printf(" TYPE=\"%s\"\n", pr->id->name);
 512
 513         return 0;
 514 }
 515
 516 static int print_block_uci(struct blkid_struct_probe *pr)
 517 {
 518         if (!strcmp(pr->id->name, "swap")) {
 519                 printf("config 'swap'\n");
 520         } else {
 521                 printf("config 'mount'\n");
 522                 printf("\toption\ttarget\t'/mnt/%s'\n", basename(pr->dev));
 523         }
 524         if (pr->uuid[0])
 525                 printf("\toption\tuuid\t'%s'\n", pr->uuid);
 526         else
 527                 printf("\toption\tdevice\t'%s'\n", pr->dev);
 528         printf("\toption\tenabled\t'0'\n\n");
 529
 530         return 0;
 531 }
 532
 533 static struct blkid_struct_probe* find_block_info(char *uuid, char *label, char *path)
 534 {
 535         struct blkid_struct_probe *pr = NULL;
 536
 537         if (uuid)
 538                 list_for_each_entry(pr, &devices, list)
 539                         if (!strcasecmp(pr->uuid, uuid))
 540                                 return pr;
 541
 542         if (label)
 543                 list_for_each_entry(pr, &devices, list)
 544                         if (!strcmp(pr->label, label))
 545                                 return pr;
 546
 547         if (path)
 548                 list_for_each_entry(pr, &devices, list)
 549                         if (!strcmp(basename(pr->dev), basename(path)))
 550                                 return pr;
 551
 552         return NULL;
 553 }
 554
 555 static char* find_mount_point(char *block)
 556 {
 557         FILE *fp = fopen("/proc/mounts", "r");
 558         static char line[256];
 559         int len = strlen(block);
 560         char *point = NULL;
 561
 562         if(!fp)
 563                 return NULL;
 564
 565         while (fgets(line, sizeof(line), fp)) {
 566                 if (!strncmp(line, block, len)) {
 567                         char *p = &line[len + 1];
 568                         char *t = strstr(p, " ");
 569
 570                         if (!t) {
 571                                 fclose(fp);
 572                                 return NULL;
 573                         }
 574                         *t = '\0';
 575                         point = p;
 576                         break;
 577                 }
 578         }
 579
 580         fclose(fp);
 581
 582         return point;
 583 }
 584
 585 static void mkdir_p(char *dir)
 586 {
 587         char *l = strrchr(dir, '/');
 588
 589         if (l) {
 590                 *l = '\0';
 591                 mkdir_p(dir);
 592                 *l = '/';
 593                 mkdir(dir, 0755);
 594         }
 595 }
 596
 597 static void check_filesystem(struct blkid_struct_probe *pr)
 598 {
 599         pid_t pid;
 600         struct stat statbuf;
 601         char *e2fsck = "/usr/sbin/e2fsck";
 602
 603         /* UBIFS does not need stuff like fsck */
 604         if (!strncmp(pr->id->name, "ubifs", 5))
 605                 return;
 606
 607         if (strncmp(pr->id->name, "ext", 3)) {
 608                 ERROR("check_filesystem: %s is not supported\n", pr->id->name);
 609                 return;
 610         }
 611
 612         if (stat(e2fsck, &statbuf) < 0) {
 613                 ERROR("check_filesystem: %s not found\n", e2fsck);
 614                 return;
 615         }
 616
 617         pid = fork();
 618         if (!pid) {
 619                 execl(e2fsck, e2fsck, "-p", pr->dev, NULL);
 620                 exit(-1);
 621         } else if (pid > 0) {
 622                 int status;
 623
 624                 waitpid(pid, &status, 0);
 625                 if (WEXITSTATUS(status))
 626                         ERROR("check_filesystem: %s returned %d\n", e2fsck, WEXITSTATUS(status));
 627         }
 628 }
 629
 630 static void handle_swapfiles(bool on)
 631 {
 632         struct stat s;
 633         struct mount *m;
 634         struct blkid_struct_probe *pr;
 635
 636         vlist_for_each_element(&mounts, m, node)
 637         {
 638                 if (m->type != TYPE_SWAP || !m->target)
 639                         continue;
 640
 641                 if (stat(m->target, &s) || !S_ISREG(s.st_mode))
 642                         continue;
 643
 644                 pr = _probe_path(m->target);
 645
 646                 if (!pr)
 647                         continue;
 648
 649                 if (!strcmp(pr->id->name, "swap")) {
 650                         if (on)
 651                                 swapon(pr->dev, m->prio);
 652                         else
 653                                 swapoff(pr->dev);
 654                 }
 655
 656                 free(pr);
 657         }
 658 }
 659
 660 static int mount_device(struct blkid_struct_probe *pr, int hotplug)
 661 {
 662         struct mount *m;
 663         char *device;
 664
 665         if (!pr)
 666                 return -1;
 667
 668         device = basename(pr->dev);
 669
 670         if (!strcmp(pr->id->name, "swap")) {
 671                 if (hotplug && !auto_swap)
 672                         return -1;
 673                 m = find_swap(pr->uuid, pr->label, device);
 674                 if (m || anon_swap)
 675                         swapon(pr->dev, (m) ? (m->prio) : (0));
 676
 677                 return 0;
 678         }
 679
 680         if (hotplug && !auto_mount)
 681                 return -1;
 682
 683         if (find_mount_point(pr->dev)) {
 684                 ERROR("%s is already mounted\n", pr->dev);
 685                 return -1;
 686         }
 687
 688         m = find_block(pr->uuid, pr->label, device, NULL);
 689         if (m && m->extroot)
 690                 return -1;
 691
 692         if (m) {
 693                 char *target = m->target;
 694                 char _target[32];
 695                 int err = 0;
 696
 697                 if (!target) {
 698                         snprintf(_target, sizeof(_target), "/mnt/%s", device);
 699                         target = _target;
 700                 }
 701                 mkdir_p(target);
 702
 703                 if (check_fs)
 704                         check_filesystem(pr);
 705
 706                 err = mount(pr->dev, target, pr->id->name, m->flags,
 707                             (m->options) ? (m->options) : (""));
 708                 if (err)
 709                         ERROR("mounting %s (%s) as %s failed (%d) - %s\n",
 710                                         pr->dev, pr->id->name, target, err, strerror(err));
 711                 else
 712                         handle_swapfiles(true);
 713                 return err;
 714         }
 715
 716         if (anon_mount) {
 717                 char target[] = "/mnt/mmcblk123";
 718                 int err = 0;
 719
 720                 snprintf(target, sizeof(target), "/mnt/%s", device);
 721                 mkdir_p(target);
 722
 723                 if (check_fs)
 724                         check_filesystem(pr);
 725
 726                 err = mount(pr->dev, target, pr->id->name, 0, "");
 727                 if (err)
 728                         ERROR("mounting %s (%s) as %s failed (%d) - %s\n",
 729                                         pr->dev, pr->id->name, target, err, strerror(err));
 730                 else
 731                         handle_swapfiles(true);
 732                 return err;
 733         }
 734
 735         return 0;
 736 }
 737
 738 static int umount_device(struct blkid_struct_probe *pr)
 739 {
 740         struct mount *m;
 741         char *device = basename(pr->dev);
 742         char *mp;
 743         int err;
 744
 745         if (!pr)
 746                 return -1;
 747
 748         if (!strcmp(pr->id->name, "swap"))
 749                 return -1;
 750
 751         mp = find_mount_point(pr->dev);
 752         if (!mp)
 753                 return -1;
 754
 755         m = find_block(pr->uuid, pr->label, device, NULL);
 756         if (m && m->extroot)
 757                 return -1;
 758
 759         err = umount2(mp, MNT_DETACH);
 760         if (err)
 761                 ERROR("unmounting %s (%s)  failed (%d) - %s\n",
 762                         pr->dev, mp, err, strerror(err));
 763         else
 764                 ERROR("unmounted %s (%s)\n",
 765                         pr->dev, mp);
 766
 767         return err;
 768 }
 769
 770 static int main_hotplug(int argc, char **argv)
 771 {
 772         char path[32];
 773         char *action, *device, *mount_point;
 774
 775         action = getenv("ACTION");
 776         device = getenv("DEVNAME");
 777
 778         if (!action || !device)
 779                 return -1;
 780         snprintf(path, sizeof(path), "/dev/%s", device);
 781
 782         if (!strcmp(action, "remove")) {
 783                 int err = 0;
 784                 mount_point = find_mount_point(path);
 785                 if (mount_point)
 786                         err = umount2(mount_point, MNT_DETACH);
 787
 788                 if (err)
 789                         ERROR("umount of %s failed (%d) - %s\n",
 790                                         mount_point, err, strerror(err));
 791
 792                 return 0;
 793         } else if (strcmp(action, "add")) {
 794                 ERROR("Unkown action %s\n", action);
 795
 796                 return -1;
 797         }
 798
 799         if (config_load(NULL))
 800                 return -1;
 801         cache_load(0);
 802
 803         return mount_device(find_block_info(NULL, NULL, path), 1);
 804 }
 805
 806 static int find_block_mtd(char *name, char *part, int plen)
 807 {
 808         FILE *fp = fopen("/proc/mtd", "r");
 809         static char line[256];
 810         char *index = NULL;
 811
 812         if(!fp)
 813                 return -1;
 814
 815         while (!index && fgets(line, sizeof(line), fp)) {
 816                 if (strstr(line, name)) {
 817                         char *eol = strstr(line, ":");
 818
 819                         if (!eol)
 820                                 continue;
 821
 822                         *eol = '\0';
 823                         index = &line[3];
 824                 }
 825         }
 826
 827         fclose(fp);
 828
 829         if (!index)
 830                 return -1;
 831
 832         snprintf(part, plen, "/dev/mtdblock%s", index);
 833
 834         return 0;
 835 }
 836
 837 #ifdef UBIFS_EXTROOT
 838 static int find_ubi_vol(libubi_t libubi, char *name, int *dev_num, int *vol_id)
 839 {
 840         int dev = 0;
 841
 842         while (ubi_dev_present(libubi, dev))
 843         {
 844                 struct ubi_dev_info dev_info;
 845                 struct ubi_vol_info vol_info;
 846
 847                 if (ubi_get_dev_info1(libubi, dev++, &dev_info))
 848                         continue;
 849                 if (ubi_get_vol_info1_nm(libubi, dev_info.dev_num, name, &vol_info))
 850                         continue;
 851
 852                 *dev_num = dev_info.dev_num;
 853                 *vol_id = vol_info.vol_id;
 854
 855                 return 0;
 856         }
 857
 858         return -1;
 859 }
 860
 861 static int find_block_ubi(libubi_t libubi, char *name, char *part, int plen)
 862 {
 863         int dev_num;
 864         int vol_id;
 865         int err = -1;
 866
 867         err = find_ubi_vol(libubi, name, &dev_num, &vol_id);
 868         if (!err)
 869                 snprintf(part, plen, "/dev/ubi%d_%d", dev_num, vol_id);
 870
 871         return err;
 872 }
 873
 874 static int find_block_ubi_RO(libubi_t libubi, char *name, char *part, int plen)
 875 {
 876         int dev_num;
 877         int vol_id;
 878         int err = -1;
 879
 880         err = find_ubi_vol(libubi, name, &dev_num, &vol_id);
 881         if (!err)
 882                 snprintf(part, plen, "/dev/ubiblock%d_%d", dev_num, vol_id);
 883
 884         return err;
 885 }
 886 #endif
 887
 888 static int check_extroot(char *path)
 889 {
 890         struct blkid_struct_probe *pr = NULL;
 891         char fs[32];
 892
 893 #ifdef UBIFS_EXTROOT
 894         if (find_block_mtd("rootfs", fs, sizeof(fs))) {
 895                 int err = -1;
 896                 libubi_t libubi;
 897
 898                 libubi = libubi_open();
 899                 err = find_block_ubi_RO(libubi, "rootfs", fs, sizeof(fs));
 900                 libubi_close(libubi);
 901                 if (err)
 902                         return -1;
 903         }
 904 #else
 905         if (find_block_mtd("rootfs", fs, sizeof(fs)))
 906                 return -1;
 907 #endif
 908
 909         list_for_each_entry(pr, &devices, list) {
 910                 if (!strcmp(pr->dev, fs)) {
 911                         struct stat s;
 912                         FILE *fp = NULL;
 913                         char tag[64];
 914                         char uuid[64] = { 0 };
 915
 916                         snprintf(tag, sizeof(tag), "%s/etc", path);
 917                         if (stat(tag, &s))
 918                                 mkdir_p(tag);
 919
 920                         snprintf(tag, sizeof(tag), "%s/etc/.extroot-uuid", path);
 921                         if (stat(tag, &s)) {
 922                                 fp = fopen(tag, "w+");
 923                                 if (!fp) {
 924                                         ERROR("extroot: failed to write uuid tag file\n");
 925                                         /* return 0 to continue boot regardless of error */
 926                                         return 0;
 927                                 }
 928                                 fputs(pr->uuid, fp);
 929                                 fclose(fp);
 930                                 return 0;
 931                         }
 932
 933                         fp = fopen(tag, "r");
 934                         if (!fp) {
 935                                 ERROR("extroot: failed to open uuid tag file\n");
 936                                 return -1;
 937                         }
 938
 939                         fgets(uuid, sizeof(uuid), fp);
 940                         fclose(fp);
 941                         if (!strcasecmp(uuid, pr->uuid))
 942                                 return 0;
 943                         ERROR("extroot: uuid tag does not match rom uuid\n");
 944                 }
 945         }
 946         return -1;
 947 }
 948
 949 /*
 950  * Read info about extroot from UCI (using prefix) and mount it.
 951  */
 952 static int mount_extroot(char *cfg)
 953 {
 954         char overlay[] = "/tmp/extroot/overlay";
 955         char mnt[] = "/tmp/extroot/mnt";
 956         char *path = mnt;
 957         struct blkid_struct_probe *pr;
 958         struct mount *m;
 959         int err = -1;
 960
 961         /* Load @cfg/etc/config/fstab */
 962         if (config_load(cfg))
 963                 return -2;
 964
 965         /* See if there is extroot-specific mount config */
 966         m = find_block(NULL, NULL, NULL, "/");
 967         if (!m)
 968                 m = find_block(NULL, NULL, NULL, "/overlay");
 969
 970         if (!m || !m->extroot)
 971         {
 972                 ERROR("extroot: no root or overlay mount defined\n");
 973                 return -1;
 974         }
 975
 976         /* Find block device pointed by the mount config */
 977         pr = find_block_info(m->uuid, m->label, m->device);
 978
 979         if (!pr && delay_root){
 980                 ERROR("extroot: is not ready yet, retrying in %u seconds\n", delay_root);
 981                 sleep(delay_root);
 982                 mkblkdev();
 983                 cache_load(0);
 984                 pr = find_block_info(m->uuid, m->label, m->device);
 985         }
 986         if (pr) {
 987                 if (strncmp(pr->id->name, "ext", 3) &&
 988                     strncmp(pr->id->name, "ubifs", 5)) {
 989                         ERROR("extroot: %s is not supported, try ext4\n", pr->id->name);
 990                         return -1;
 991                 }
 992                 if (m->overlay)
 993                         path = overlay;
 994                 mkdir_p(path);
 995
 996                 if (check_fs)
 997                         check_filesystem(pr);
 998
 999                 err = mount(pr->dev, path, pr->id->name, 0, (m->options) ? (m->options) : (""));
1000
1001                 if (err) {
1002                         ERROR("mounting %s (%s) as %s failed (%d) - %s\n",
1003                                         pr->dev, pr->id->name, path, err, strerror(err));
1004                 } else if (m->overlay) {
1005                         err = check_extroot(path);
1006                         if (err)
1007                                 umount(path);
1008                 }
1009         } else {
1010                 ERROR("extroot: cannot find block device\n");
1011         }
1012
1013         return err;
1014 }
1015
1016 static int main_extroot(int argc, char **argv)
1017 {
1018         struct blkid_struct_probe *pr;
1019         char blkdev_path[32] = { 0 };
1020         int err = -1;
1021 #ifdef UBIFS_EXTROOT
1022         libubi_t libubi;
1023 #endif
1024
1025         if (!getenv("PREINIT"))
1026                 return -1;
1027
1028         if (argc != 2) {
1029                 fprintf(stderr, "Usage: block extroot mountpoint\n");
1030                 return -1;
1031         }
1032
1033         mkblkdev();
1034         cache_load(1);
1035
1036         /*
1037          * Look for "rootfs_data". We will want to mount it and check for
1038          * extroot configuration.
1039          */
1040
1041         /* Start with looking for MTD partition */
1042         find_block_mtd("rootfs_data", blkdev_path, sizeof(blkdev_path));
1043         if (blkdev_path[0]) {
1044                 pr = find_block_info(NULL, NULL, blkdev_path);
1045                 if (pr && !strcmp(pr->id->name, "jffs2")) {
1046                         char cfg[] = "/tmp/jffs_cfg";
1047
1048                         /*
1049                          * Mount MTD part and try extroot (using
1050                          * /etc/config/fstab from that partition)
1051                          */
1052                         mkdir_p(cfg);
1053                         if (!mount(blkdev_path, cfg, "jffs2", MS_NOATIME, NULL)) {
1054                                 err = mount_extroot(cfg);
1055                                 umount2(cfg, MNT_DETACH);
1056                         }
1057                         if (err < 0)
1058                                 rmdir("/tmp/overlay");
1059                         rmdir(cfg);
1060                         return err;
1061                 }
1062         }
1063
1064 #ifdef UBIFS_EXTROOT
1065         /* ... but it also could be an UBI volume */
1066         memset(blkdev_path, 0, sizeof(blkdev_path));
1067         libubi = libubi_open();
1068         find_block_ubi(libubi, "rootfs_data", blkdev_path, sizeof(blkdev_path));
1069         libubi_close(libubi);
1070         if (blkdev_path[0]) {
1071                 char cfg[] = "/tmp/ubifs_cfg";
1072
1073                 /* Mount volume and try extroot (using fstab from that vol) */
1074                 mkdir_p(cfg);
1075                 if (!mount(blkdev_path, cfg, "ubifs", MS_NOATIME, NULL)) {
1076                         err = mount_extroot(cfg);
1077                         umount2(cfg, MNT_DETACH);
1078                 }
1079                 if (err < 0)
1080                         rmdir("/tmp/overlay");
1081                 rmdir(cfg);
1082                 return err;
1083        }
1084 #endif
1085
1086         return mount_extroot(NULL);
1087 }
1088
1089 static int main_mount(int argc, char **argv)
1090 {
1091         struct blkid_struct_probe *pr;
1092
1093         if (config_load(NULL))
1094                 return -1;
1095
1096         cache_load(1);
1097         list_for_each_entry(pr, &devices, list)
1098                 mount_device(pr, 0);
1099
1100         handle_swapfiles(true);
1101
1102         return 0;
1103 }
1104
1105 static int main_umount(int argc, char **argv)
1106 {
1107         struct blkid_struct_probe *pr;
1108
1109         if (config_load(NULL))
1110                 return -1;
1111
1112         handle_swapfiles(false);
1113
1114         cache_load(0);
1115         list_for_each_entry(pr, &devices, list)
1116                 umount_device(pr);
1117
1118         return 0;
1119 }
1120
1121 static int main_detect(int argc, char **argv)
1122 {
1123         struct blkid_struct_probe *pr;
1124
1125         cache_load(0);
1126         printf("config 'global'\n");
1127         printf("\toption\tanon_swap\t'0'\n");
1128         printf("\toption\tanon_mount\t'0'\n");
1129         printf("\toption\tauto_swap\t'1'\n");
1130         printf("\toption\tauto_mount\t'1'\n");
1131         printf("\toption\tdelay_root\t'5'\n");
1132         printf("\toption\tcheck_fs\t'0'\n\n");
1133         list_for_each_entry(pr, &devices, list)
1134                 print_block_uci(pr);
1135
1136         return 0;
1137 }
1138
1139 static int main_info(int argc, char **argv)
1140 {
1141         int i;
1142         struct blkid_struct_probe *pr;
1143
1144         cache_load(1);
1145         if (argc == 2) {
1146                 list_for_each_entry(pr, &devices, list)
1147                         print_block_info(pr);
1148
1149                 return 0;
1150         };
1151
1152         for (i = 2; i < argc; i++) {
1153                 struct stat s;
1154
1155                 if (stat(argv[i], &s)) {
1156                         ERROR("failed to stat %s\n", argv[i]);
1157                         continue;
1158                 }
1159                 if (!S_ISBLK(s.st_mode)) {
1160                         ERROR("%s is not a block device\n", argv[i]);
1161                         continue;
1162                 }
1163                 pr = find_block_info(NULL, NULL, argv[i]);
1164                 if (pr)
1165                         print_block_info(pr);
1166         }
1167
1168         return 0;
1169 }
1170
1171 static int swapon_usage(void)
1172 {
1173         fprintf(stderr, "Usage: swapon [-s] [-a] [[-p pri] DEVICE]\n\n"
1174                 "\tStart swapping on [DEVICE]\n"
1175                 " -a\tStart swapping on all swap devices\n"
1176                 " -p pri\tSet priority of swap device\n"
1177                 " -s\tShow summary\n");
1178         return -1;
1179 }
1180
1181 static int main_swapon(int argc, char **argv)
1182 {
1183         int ch;
1184         FILE *fp;
1185         char *lineptr;
1186         size_t s;
1187         struct blkid_struct_probe *pr;
1188         int flags = 0;
1189         int pri;
1190         struct stat st;
1191         int err;
1192
1193         while ((ch = getopt(argc, argv, "ap:s")) != -1) {
1194                 switch(ch) {
1195                 case 's':
1196                         fp = fopen("/proc/swaps", "r");
1197                         lineptr = NULL;
1198
1199                         if (!fp) {
1200                                 ERROR("failed to open /proc/swaps\n");
1201                                 return -1;
1202                         }
1203                         while (getline(&lineptr, &s, fp) > 0)
1204                                 printf(lineptr);
1205                         if (lineptr)
1206                                 free(lineptr);
1207                         fclose(fp);
1208                         return 0;
1209                 case 'a':
1210                         cache_load(0);
1211                         list_for_each_entry(pr, &devices, list) {
1212                                 if (strcmp(pr->id->name, "swap"))
1213                                         continue;
1214                                 if (swapon(pr->dev, 0))
1215                                         ERROR("failed to swapon %s\n", pr->dev);
1216                         }
1217                         return 0;
1218                 case 'p':
1219                         pri = atoi(optarg);
1220                         if (pri >= 0)
1221                                 flags = ((pri << SWAP_FLAG_PRIO_SHIFT) & SWAP_FLAG_PRIO_MASK) | SWAP_FLAG_PREFER;
1222                         break;
1223                 default:
1224                         return swapon_usage();
1225                 }
1226
1227         }
1228
1229         if (optind != (argc - 1))
1230                 return swapon_usage();
1231
1232         if (stat(argv[optind], &st) || (!S_ISBLK(st.st_mode) && !S_ISREG(st.st_mode))) {
1233                 ERROR("%s is not a block device or file\n", argv[optind]);
1234                 return -1;
1235         }
1236         err = swapon(argv[optind], flags);
1237         if (err) {
1238                 ERROR("failed to swapon %s (%d)\n", argv[optind], err);
1239                 return err;
1240         }
1241
1242         return 0;
1243 }
1244
1245 static int main_swapoff(int argc, char **argv)
1246 {
1247         if (argc != 2) {
1248                 ERROR("Usage: swapoff [-a] [DEVICE]\n\n"
1249                         "\tStop swapping on DEVICE\n"
1250                         " -a\tStop swapping on all swap devices\n");
1251                 return -1;
1252         }
1253
1254         if (!strcmp(argv[1], "-a")) {
1255                 FILE *fp = fopen("/proc/swaps", "r");
1256                 char line[256];
1257
1258                 if (!fp) {
1259                         ERROR("failed to open /proc/swaps\n");
1260                         return -1;
1261                 }
1262                 fgets(line, sizeof(line), fp);
1263                 while (fgets(line, sizeof(line), fp)) {
1264                         char *end = strchr(line, ' ');
1265                         int err;
1266
1267                         if (!end)
1268                                 continue;
1269                         *end = '\0';
1270                         err = swapoff(line);
1271                         if (err)
1272                                 ERROR("failed to swapoff %s (%d)\n", line, err);
1273                 }
1274                 fclose(fp);
1275         } else {
1276                 struct stat s;
1277                 int err;
1278
1279                 if (stat(argv[1], &s) || (!S_ISBLK(s.st_mode) && !S_ISREG(s.st_mode))) {
1280                         ERROR("%s is not a block device or file\n", argv[1]);
1281                         return -1;
1282                 }
1283                 err = swapoff(argv[1]);
1284                 if (err) {
1285                         ERROR("fsiled to swapoff %s (%d)\n", argv[1], err);
1286                         return err;
1287                 }
1288         }
1289
1290         return 0;
1291 }
1292
1293 int main(int argc, char **argv)
1294 {
1295         char *base = basename(*argv);
1296
1297         umask(0);
1298
1299         if (!strcmp(base, "swapon"))
1300                 return main_swapon(argc, argv);
1301
1302         if (!strcmp(base, "swapoff"))
1303                 return main_swapoff(argc, argv);
1304
1305         if ((argc > 1) && !strcmp(base, "block")) {
1306                 if (!strcmp(argv[1], "info"))
1307                         return main_info(argc, argv);
1308
1309                 if (!strcmp(argv[1], "detect"))
1310                         return main_detect(argc, argv);
1311
1312                 if (!strcmp(argv[1], "hotplug"))
1313                         return main_hotplug(argc, argv);
1314
1315                 if (!strcmp(argv[1], "extroot"))
1316                         return main_extroot(argc, argv);
1317
1318                 if (!strcmp(argv[1], "mount"))
1319                         return main_mount(argc, argv);
1320
1321                 if (!strcmp(argv[1], "umount"))
1322                         return main_umount(argc, argv);
1323         }
1324
1325         fprintf(stderr, "Usage: block <info|mount|umount|detect>\n");
1326
1327         return -1;
1328 }