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         {
 415                 char *err;
 416                 uci_get_errorstr(ctx, &err, "fstab");
 417                 ERROR("extroot: failed to load %s/etc/config/%s\n",
 418                       cfg ? cfg : "", err);
 419                 free(err);
 420                 return -1;
 421         }
 422
 423         vlist_update(&mounts);
 424         uci_foreach_element(&pkg->sections, e) {
 425                 struct uci_section *s = uci_to_section(e);
 426
 427                 if (!strcmp(s->type, "mount"))
 428                         mount_add(s);
 429                 if (!strcmp(s->type, "swap"))
 430                         swap_add(s);
 431                 if (!strcmp(s->type, "global"))
 432                         global_add(s);
 433         }
 434         vlist_flush(&mounts);
 435
 436         return 0;
 437 }
 438
 439 static struct blkid_struct_probe* _probe_path(char *path)
 440 {
 441         struct blkid_struct_probe *pr;
 442
 443         pr = malloc(sizeof(*pr));
 444
 445         if (!pr)
 446                 return NULL;
 447
 448         memset(pr, 0, sizeof(*pr));
 449         probe_block(path, pr);
 450
 451         if (pr->err || !pr->id) {
 452                 free(pr);
 453                 return NULL;
 454         }
 455
 456         return pr;
 457 }
 458
 459 static int _cache_load(const char *path)
 460 {
 461         int gl_flags = GLOB_NOESCAPE | GLOB_MARK;
 462         int j;
 463         glob_t gl;
 464
 465         if (glob(path, gl_flags, NULL, &gl) < 0)
 466                 return -1;
 467
 468         for (j = 0; j < gl.gl_pathc; j++) {
 469                 struct blkid_struct_probe *pr = _probe_path(gl.gl_pathv[j]);
 470                 if (pr)
 471                         list_add_tail(&pr->list, &devices);
 472         }
 473
 474         globfree(&gl);
 475
 476         return 0;
 477 }
 478
 479 static void cache_load(int mtd)
 480 {
 481         if (mtd) {
 482                 _cache_load("/dev/mtdblock*");
 483                 _cache_load("/dev/ubiblock*");
 484                 _cache_load("/dev/ubi?*_?*");
 485         }
 486         _cache_load("/dev/mmcblk*");
 487         _cache_load("/dev/sd*");
 488         _cache_load("/dev/hd*");
 489         _cache_load("/dev/md*");
 490         _cache_load("/dev/vd*");
 491         _cache_load("/dev/mapper/*");
 492 }
 493
 494 static int print_block_info(struct blkid_struct_probe *pr)
 495 {
 496         printf("%s:", pr->dev);
 497         if (pr->uuid[0])
 498                 printf(" UUID=\"%s\"", pr->uuid);
 499
 500         if (pr->label[0])
 501                 printf(" LABEL=\"%s\"", pr->label);
 502
 503         if (pr->name[0])
 504                 printf(" NAME=\"%s\"", pr->name);
 505
 506         if (pr->version[0])
 507                 printf(" VERSION=\"%s\"", pr->version);
 508
 509         printf(" TYPE=\"%s\"\n", pr->id->name);
 510
 511         return 0;
 512 }
 513
 514 static int print_block_uci(struct blkid_struct_probe *pr)
 515 {
 516         if (!strcmp(pr->id->name, "swap")) {
 517                 printf("config 'swap'\n");
 518         } else {
 519                 printf("config 'mount'\n");
 520                 printf("\toption\ttarget\t'/mnt/%s'\n", basename(pr->dev));
 521         }
 522         if (pr->uuid[0])
 523                 printf("\toption\tuuid\t'%s'\n", pr->uuid);
 524         else
 525                 printf("\toption\tdevice\t'%s'\n", pr->dev);
 526         printf("\toption\tenabled\t'0'\n\n");
 527
 528         return 0;
 529 }
 530
 531 static struct blkid_struct_probe* find_block_info(char *uuid, char *label, char *path)
 532 {
 533         struct blkid_struct_probe *pr = NULL;
 534
 535         if (uuid)
 536                 list_for_each_entry(pr, &devices, list)
 537                         if (!strcasecmp(pr->uuid, uuid))
 538                                 return pr;
 539
 540         if (label)
 541                 list_for_each_entry(pr, &devices, list)
 542                         if (!strcmp(pr->label, label))
 543                                 return pr;
 544
 545         if (path)
 546                 list_for_each_entry(pr, &devices, list)
 547                         if (!strcmp(basename(pr->dev), basename(path)))
 548                                 return pr;
 549
 550         return NULL;
 551 }
 552
 553 static char* find_mount_point(char *block)
 554 {
 555         FILE *fp = fopen("/proc/mounts", "r");
 556         static char line[256];
 557         int len = strlen(block);
 558         char *point = NULL;
 559
 560         if(!fp)
 561                 return NULL;
 562
 563         while (fgets(line, sizeof(line), fp)) {
 564                 if (!strncmp(line, block, len)) {
 565                         char *p = &line[len + 1];
 566                         char *t = strstr(p, " ");
 567
 568                         if (!t) {
 569                                 fclose(fp);
 570                                 return NULL;
 571                         }
 572                         *t = '\0';
 573                         point = p;
 574                         break;
 575                 }
 576         }
 577
 578         fclose(fp);
 579
 580         return point;
 581 }
 582
 583 static void mkdir_p(char *dir)
 584 {
 585         char *l = strrchr(dir, '/');
 586
 587         if (l) {
 588                 *l = '\0';
 589                 mkdir_p(dir);
 590                 *l = '/';
 591                 mkdir(dir, 0755);
 592         }
 593 }
 594
 595 static void check_filesystem(struct blkid_struct_probe *pr)
 596 {
 597         pid_t pid;
 598         struct stat statbuf;
 599         char *e2fsck = "/usr/sbin/e2fsck";
 600
 601         /* UBIFS does not need stuff like fsck */
 602         if (!strncmp(pr->id->name, "ubifs", 5))
 603                 return;
 604
 605         if (strncmp(pr->id->name, "ext", 3)) {
 606                 ERROR("check_filesystem: %s is not supported\n", pr->id->name);
 607                 return;
 608         }
 609
 610         if (stat(e2fsck, &statbuf) < 0) {
 611                 ERROR("check_filesystem: %s not found\n", e2fsck);
 612                 return;
 613         }
 614
 615         pid = fork();
 616         if (!pid) {
 617                 execl(e2fsck, e2fsck, "-p", pr->dev, NULL);
 618                 exit(-1);
 619         } else if (pid > 0) {
 620                 int status;
 621
 622                 waitpid(pid, &status, 0);
 623                 if (WEXITSTATUS(status))
 624                         ERROR("check_filesystem: %s returned %d\n", e2fsck, WEXITSTATUS(status));
 625         }
 626 }
 627
 628 static void handle_swapfiles(bool on)
 629 {
 630         struct stat s;
 631         struct mount *m;
 632         struct blkid_struct_probe *pr;
 633
 634         vlist_for_each_element(&mounts, m, node)
 635         {
 636                 if (m->type != TYPE_SWAP || !m->target)
 637                         continue;
 638
 639                 if (stat(m->target, &s) || !S_ISREG(s.st_mode))
 640                         continue;
 641
 642                 pr = _probe_path(m->target);
 643
 644                 if (!pr)
 645                         continue;
 646
 647                 if (!strcmp(pr->id->name, "swap")) {
 648                         if (on)
 649                                 swapon(pr->dev, m->prio);
 650                         else
 651                                 swapoff(pr->dev);
 652                 }
 653
 654                 free(pr);
 655         }
 656 }
 657
 658 static int mount_device(struct blkid_struct_probe *pr, int hotplug)
 659 {
 660         struct mount *m;
 661         char *device;
 662
 663         if (!pr)
 664                 return -1;
 665
 666         device = basename(pr->dev);
 667
 668         if (!strcmp(pr->id->name, "swap")) {
 669                 if (hotplug && !auto_swap)
 670                         return -1;
 671                 m = find_swap(pr->uuid, pr->label, device);
 672                 if (m || anon_swap)
 673                         swapon(pr->dev, (m) ? (m->prio) : (0));
 674
 675                 return 0;
 676         }
 677
 678         if (hotplug && !auto_mount)
 679                 return -1;
 680
 681         if (find_mount_point(pr->dev)) {
 682                 ERROR("%s is already mounted\n", pr->dev);
 683                 return -1;
 684         }
 685
 686         m = find_block(pr->uuid, pr->label, device, NULL);
 687         if (m && m->extroot)
 688                 return -1;
 689
 690         if (m) {
 691                 char *target = m->target;
 692                 char _target[32];
 693                 int err = 0;
 694
 695                 if (!target) {
 696                         snprintf(_target, sizeof(_target), "/mnt/%s", device);
 697                         target = _target;
 698                 }
 699                 mkdir_p(target);
 700
 701                 if (check_fs)
 702                         check_filesystem(pr);
 703
 704                 err = mount(pr->dev, target, pr->id->name, m->flags,
 705                             (m->options) ? (m->options) : (""));
 706                 if (err)
 707                         ERROR("mounting %s (%s) as %s failed (%d) - %s\n",
 708                                         pr->dev, pr->id->name, target, err, strerror(err));
 709                 else
 710                         handle_swapfiles(true);
 711                 return err;
 712         }
 713
 714         if (anon_mount) {
 715                 char target[] = "/mnt/mmcblk123";
 716                 int err = 0;
 717
 718                 snprintf(target, sizeof(target), "/mnt/%s", device);
 719                 mkdir_p(target);
 720
 721                 if (check_fs)
 722                         check_filesystem(pr);
 723
 724                 err = mount(pr->dev, target, pr->id->name, 0, "");
 725                 if (err)
 726                         ERROR("mounting %s (%s) as %s failed (%d) - %s\n",
 727                                         pr->dev, pr->id->name, target, err, strerror(err));
 728                 else
 729                         handle_swapfiles(true);
 730                 return err;
 731         }
 732
 733         return 0;
 734 }
 735
 736 static int umount_device(struct blkid_struct_probe *pr)
 737 {
 738         struct mount *m;
 739         char *device = basename(pr->dev);
 740         char *mp;
 741         int err;
 742
 743         if (!pr)
 744                 return -1;
 745
 746         if (!strcmp(pr->id->name, "swap"))
 747                 return -1;
 748
 749         mp = find_mount_point(pr->dev);
 750         if (!mp)
 751                 return -1;
 752
 753         m = find_block(pr->uuid, pr->label, device, NULL);
 754         if (m && m->extroot)
 755                 return -1;
 756
 757         err = umount2(mp, MNT_DETACH);
 758         if (err)
 759                 ERROR("unmounting %s (%s)  failed (%d) - %s\n",
 760                         pr->dev, mp, err, strerror(err));
 761         else
 762                 ERROR("unmounted %s (%s)\n",
 763                         pr->dev, mp);
 764
 765         return err;
 766 }
 767
 768 static int main_hotplug(int argc, char **argv)
 769 {
 770         char path[32];
 771         char *action, *device, *mount_point;
 772
 773         action = getenv("ACTION");
 774         device = getenv("DEVNAME");
 775
 776         if (!action || !device)
 777                 return -1;
 778         snprintf(path, sizeof(path), "/dev/%s", device);
 779
 780         if (!strcmp(action, "remove")) {
 781                 int err = 0;
 782                 mount_point = find_mount_point(path);
 783                 if (mount_point)
 784                         err = umount2(mount_point, MNT_DETACH);
 785
 786                 if (err)
 787                         ERROR("umount of %s failed (%d) - %s\n",
 788                                         mount_point, err, strerror(err));
 789
 790                 return 0;
 791         } else if (strcmp(action, "add")) {
 792                 ERROR("Unkown action %s\n", action);
 793
 794                 return -1;
 795         }
 796
 797         if (config_load(NULL))
 798                 return -1;
 799         cache_load(0);
 800
 801         return mount_device(find_block_info(NULL, NULL, path), 1);
 802 }
 803
 804 static int find_block_mtd(char *name, char *part, int plen)
 805 {
 806         FILE *fp = fopen("/proc/mtd", "r");
 807         static char line[256];
 808         char *index = NULL;
 809
 810         if(!fp)
 811                 return -1;
 812
 813         while (!index && fgets(line, sizeof(line), fp)) {
 814                 if (strstr(line, name)) {
 815                         char *eol = strstr(line, ":");
 816
 817                         if (!eol)
 818                                 continue;
 819
 820                         *eol = '\0';
 821                         index = &line[3];
 822                 }
 823         }
 824
 825         fclose(fp);
 826
 827         if (!index)
 828                 return -1;
 829
 830         snprintf(part, plen, "/dev/mtdblock%s", index);
 831
 832         return 0;
 833 }
 834
 835 #ifdef UBIFS_EXTROOT
 836 static int find_ubi_vol(libubi_t libubi, char *name, int *dev_num, int *vol_id)
 837 {
 838         int dev = 0;
 839
 840         while (ubi_dev_present(libubi, dev))
 841         {
 842                 struct ubi_dev_info dev_info;
 843                 struct ubi_vol_info vol_info;
 844
 845                 if (ubi_get_dev_info1(libubi, dev++, &dev_info))
 846                         continue;
 847                 if (ubi_get_vol_info1_nm(libubi, dev_info.dev_num, name, &vol_info))
 848                         continue;
 849
 850                 *dev_num = dev_info.dev_num;
 851                 *vol_id = vol_info.vol_id;
 852
 853                 return 0;
 854         }
 855
 856         return -1;
 857 }
 858
 859 static int find_block_ubi(libubi_t libubi, char *name, char *part, int plen)
 860 {
 861         int dev_num;
 862         int vol_id;
 863         int err = -1;
 864
 865         err = find_ubi_vol(libubi, name, &dev_num, &vol_id);
 866         if (!err)
 867                 snprintf(part, plen, "/dev/ubi%d_%d", dev_num, vol_id);
 868
 869         return err;
 870 }
 871
 872 static int find_block_ubi_RO(libubi_t libubi, char *name, char *part, int plen)
 873 {
 874         int dev_num;
 875         int vol_id;
 876         int err = -1;
 877
 878         err = find_ubi_vol(libubi, name, &dev_num, &vol_id);
 879         if (!err)
 880                 snprintf(part, plen, "/dev/ubiblock%d_%d", dev_num, vol_id);
 881
 882         return err;
 883 }
 884 #endif
 885
 886 static int check_extroot(char *path)
 887 {
 888         struct blkid_struct_probe *pr = NULL;
 889         char fs[32];
 890
 891 #ifdef UBIFS_EXTROOT
 892         if (find_block_mtd("rootfs", fs, sizeof(fs))) {
 893                 int err = -1;
 894                 libubi_t libubi;
 895
 896                 libubi = libubi_open();
 897                 err = find_block_ubi_RO(libubi, "rootfs", fs, sizeof(fs));
 898                 libubi_close(libubi);
 899                 if (err)
 900                         return -1;
 901         }
 902 #else
 903         if (find_block_mtd("rootfs", fs, sizeof(fs)))
 904                 return -1;
 905 #endif
 906
 907         list_for_each_entry(pr, &devices, list) {
 908                 if (!strcmp(pr->dev, fs)) {
 909                         struct stat s;
 910                         FILE *fp = NULL;
 911                         char tag[64];
 912                         char uuid[64] = { 0 };
 913
 914                         snprintf(tag, sizeof(tag), "%s/etc", path);
 915                         if (stat(tag, &s))
 916                                 mkdir_p(tag);
 917
 918                         snprintf(tag, sizeof(tag), "%s/etc/.extroot-uuid", path);
 919                         if (stat(tag, &s)) {
 920                                 fp = fopen(tag, "w+");
 921                                 if (!fp) {
 922                                         ERROR("extroot: failed to write uuid tag file\n");
 923                                         /* return 0 to continue boot regardless of error */
 924                                         return 0;
 925                                 }
 926                                 fputs(pr->uuid, fp);
 927                                 fclose(fp);
 928                                 return 0;
 929                         }
 930
 931                         fp = fopen(tag, "r");
 932                         if (!fp) {
 933                                 ERROR("extroot: failed to open uuid tag file\n");
 934                                 return -1;
 935                         }
 936
 937                         fgets(uuid, sizeof(uuid), fp);
 938                         fclose(fp);
 939                         if (!strcasecmp(uuid, pr->uuid))
 940                                 return 0;
 941                         ERROR("extroot: uuid tag does not match rom uuid\n");
 942                 }
 943         }
 944         return -1;
 945 }
 946
 947 /*
 948  * Read info about extroot from UCI (using prefix) and mount it.
 949  */
 950 static int mount_extroot(char *cfg)
 951 {
 952         char overlay[] = "/tmp/extroot/overlay";
 953         char mnt[] = "/tmp/extroot/mnt";
 954         char *path = mnt;
 955         struct blkid_struct_probe *pr;
 956         struct mount *m;
 957         int err = -1;
 958
 959         /* Load @cfg/etc/config/fstab */
 960         if (config_load(cfg))
 961                 return -2;
 962
 963         /* See if there is extroot-specific mount config */
 964         m = find_block(NULL, NULL, NULL, "/");
 965         if (!m)
 966                 m = find_block(NULL, NULL, NULL, "/overlay");
 967
 968         if (!m || !m->extroot)
 969         {
 970                 ERROR("extroot: no root or overlay mount defined\n");
 971                 return -1;
 972         }
 973
 974         /* Find block device pointed by the mount config */
 975         pr = find_block_info(m->uuid, m->label, m->device);
 976
 977         if (!pr && delay_root){
 978                 ERROR("extroot: is not ready yet, retrying in %u seconds\n", delay_root);
 979                 sleep(delay_root);
 980                 mkblkdev();
 981                 cache_load(0);
 982                 pr = find_block_info(m->uuid, m->label, m->device);
 983         }
 984         if (pr) {
 985                 if (strncmp(pr->id->name, "ext", 3) &&
 986                     strncmp(pr->id->name, "ubifs", 5)) {
 987                         ERROR("extroot: %s is not supported, try ext4\n", pr->id->name);
 988                         return -1;
 989                 }
 990                 if (m->overlay)
 991                         path = overlay;
 992                 mkdir_p(path);
 993
 994                 if (check_fs)
 995                         check_filesystem(pr);
 996
 997                 err = mount(pr->dev, path, pr->id->name, 0, (m->options) ? (m->options) : (""));
 998
 999                 if (err) {
1000                         ERROR("mounting %s (%s) as %s failed (%d) - %s\n",
1001                                         pr->dev, pr->id->name, path, err, strerror(err));
1002                 } else if (m->overlay) {
1003                         err = check_extroot(path);
1004                         if (err)
1005                                 umount(path);
1006                 }
1007         } else {
1008                 ERROR("extroot: cannot find block device\n");
1009         }
1010
1011         return err;
1012 }
1013
1014 static int main_extroot(int argc, char **argv)
1015 {
1016         struct blkid_struct_probe *pr;
1017         char fs[32] = { 0 };
1018         char blkdev_path[32] = { 0 };
1019         int err = -1;
1020 #ifdef UBIFS_EXTROOT
1021         libubi_t libubi;
1022 #endif
1023
1024         if (!getenv("PREINIT"))
1025                 return -1;
1026
1027         if (argc != 2) {
1028                 fprintf(stderr, "Usage: block extroot mountpoint\n");
1029                 return -1;
1030         }
1031
1032         mkblkdev();
1033         cache_load(1);
1034
1035         /*
1036          * Make sure there is "rootfs" MTD partition or UBI volume.
1037          * TODO: What for?
1038          */
1039         find_block_mtd("rootfs", fs, sizeof(fs));
1040         if (!fs[0]) {
1041 #ifdef UBIFS_EXTROOT
1042                 libubi = libubi_open();
1043                 find_block_ubi_RO(libubi, "rootfs", fs, sizeof(fs));
1044                 libubi_close(libubi);
1045                 if (!fs[0]) {
1046                         ERROR("extroot: unable to locate rootfs mtdblock / ubiblock\n");
1047                         return -2;
1048                 }
1049 #else
1050                 ERROR("extroot: unable to locate rootfs mtdblock\n");
1051                 return -2;
1052 #endif
1053         }
1054
1055         pr = find_block_info(NULL, NULL, fs);
1056         if (!pr) {
1057                 ERROR("extroot: unable to retrieve rootfs information\n");
1058                 return -3;
1059         }
1060
1061         /*
1062          * Look for "rootfs_data". We will want to mount it and check for
1063          * extroot configuration.
1064          */
1065
1066         /* Start with looking for MTD partition */
1067         find_block_mtd("rootfs_data", blkdev_path, sizeof(blkdev_path));
1068         if (blkdev_path[0]) {
1069                 pr = find_block_info(NULL, NULL, blkdev_path);
1070                 if (pr && !strcmp(pr->id->name, "jffs2")) {
1071                         char cfg[] = "/tmp/jffs_cfg";
1072
1073                         /*
1074                          * Mount MTD part and try extroot (using
1075                          * /etc/config/fstab from that partition)
1076                          */
1077                         mkdir_p(cfg);
1078                         if (!mount(blkdev_path, cfg, "jffs2", MS_NOATIME, NULL)) {
1079                                 err = mount_extroot(cfg);
1080                                 umount2(cfg, MNT_DETACH);
1081                         }
1082                         if (err < 0)
1083                                 rmdir("/tmp/overlay");
1084                         rmdir(cfg);
1085                         return err;
1086                 }
1087         }
1088
1089 #ifdef UBIFS_EXTROOT
1090         /* ... but it also could be an UBI volume */
1091         memset(blkdev_path, 0, sizeof(blkdev_path));
1092         libubi = libubi_open();
1093         find_block_ubi(libubi, "rootfs_data", blkdev_path, sizeof(blkdev_path));
1094         libubi_close(libubi);
1095         if (blkdev_path[0]) {
1096                 char cfg[] = "/tmp/ubifs_cfg";
1097
1098                 /* Mount volume and try extroot (using fstab from that vol) */
1099                 mkdir_p(cfg);
1100                 if (!mount(blkdev_path, cfg, "ubifs", MS_NOATIME, NULL)) {
1101                         err = mount_extroot(cfg);
1102                         umount2(cfg, MNT_DETACH);
1103                 }
1104                 if (err < 0)
1105                         rmdir("/tmp/overlay");
1106                 rmdir(cfg);
1107                 return err;
1108        }
1109 #endif
1110
1111         return mount_extroot(NULL);
1112 }
1113
1114 static int main_mount(int argc, char **argv)
1115 {
1116         struct blkid_struct_probe *pr;
1117
1118         if (config_load(NULL))
1119                 return -1;
1120
1121         cache_load(1);
1122         list_for_each_entry(pr, &devices, list)
1123                 mount_device(pr, 0);
1124
1125         handle_swapfiles(true);
1126
1127         return 0;
1128 }
1129
1130 static int main_umount(int argc, char **argv)
1131 {
1132         struct blkid_struct_probe *pr;
1133
1134         if (config_load(NULL))
1135                 return -1;
1136
1137         handle_swapfiles(false);
1138
1139         cache_load(0);
1140         list_for_each_entry(pr, &devices, list)
1141                 umount_device(pr);
1142
1143         return 0;
1144 }
1145
1146 static int main_detect(int argc, char **argv)
1147 {
1148         struct blkid_struct_probe *pr;
1149
1150         cache_load(0);
1151         printf("config 'global'\n");
1152         printf("\toption\tanon_swap\t'0'\n");
1153         printf("\toption\tanon_mount\t'0'\n");
1154         printf("\toption\tauto_swap\t'1'\n");
1155         printf("\toption\tauto_mount\t'1'\n");
1156         printf("\toption\tdelay_root\t'5'\n");
1157         printf("\toption\tcheck_fs\t'0'\n\n");
1158         list_for_each_entry(pr, &devices, list)
1159                 print_block_uci(pr);
1160
1161         return 0;
1162 }
1163
1164 static int main_info(int argc, char **argv)
1165 {
1166         int i;
1167         struct blkid_struct_probe *pr;
1168
1169         cache_load(1);
1170         if (argc == 2) {
1171                 list_for_each_entry(pr, &devices, list)
1172                         print_block_info(pr);
1173
1174                 return 0;
1175         };
1176
1177         for (i = 2; i < argc; i++) {
1178                 struct stat s;
1179
1180                 if (stat(argv[i], &s)) {
1181                         ERROR("failed to stat %s\n", argv[i]);
1182                         continue;
1183                 }
1184                 if (!S_ISBLK(s.st_mode)) {
1185                         ERROR("%s is not a block device\n", argv[i]);
1186                         continue;
1187                 }
1188                 pr = find_block_info(NULL, NULL, argv[i]);
1189                 if (pr)
1190                         print_block_info(pr);
1191         }
1192
1193         return 0;
1194 }
1195
1196 static int swapon_usage(void)
1197 {
1198         fprintf(stderr, "Usage: swapon [-s] [-a] [[-p pri] DEVICE]\n\n"
1199                 "\tStart swapping on [DEVICE]\n"
1200                 " -a\tStart swapping on all swap devices\n"
1201                 " -p pri\tSet priority of swap device\n"
1202                 " -s\tShow summary\n");
1203         return -1;
1204 }
1205
1206 static int main_swapon(int argc, char **argv)
1207 {
1208         int ch;
1209         FILE *fp;
1210         char *lineptr;
1211         size_t s;
1212         struct blkid_struct_probe *pr;
1213         int flags = 0;
1214         int pri;
1215         struct stat st;
1216         int err;
1217
1218         while ((ch = getopt(argc, argv, "ap:s")) != -1) {
1219                 switch(ch) {
1220                 case 's':
1221                         fp = fopen("/proc/swaps", "r");
1222                         lineptr = NULL;
1223
1224                         if (!fp) {
1225                                 ERROR("failed to open /proc/swaps\n");
1226                                 return -1;
1227                         }
1228                         while (getline(&lineptr, &s, fp) > 0)
1229                                 printf(lineptr);
1230                         if (lineptr)
1231                                 free(lineptr);
1232                         fclose(fp);
1233                         return 0;
1234                 case 'a':
1235                         cache_load(0);
1236                         list_for_each_entry(pr, &devices, list) {
1237                                 if (strcmp(pr->id->name, "swap"))
1238                                         continue;
1239                                 if (swapon(pr->dev, 0))
1240                                         ERROR("failed to swapon %s\n", pr->dev);
1241                         }
1242                         return 0;
1243                 case 'p':
1244                         pri = atoi(optarg);
1245                         if (pri >= 0)
1246                                 flags = ((pri << SWAP_FLAG_PRIO_SHIFT) & SWAP_FLAG_PRIO_MASK) | SWAP_FLAG_PREFER;
1247                         break;
1248                 default:
1249                         return swapon_usage();
1250                 }
1251
1252         }
1253
1254         if (optind != (argc - 1))
1255                 return swapon_usage();
1256
1257         if (stat(argv[optind], &st) || (!S_ISBLK(st.st_mode) && !S_ISREG(st.st_mode))) {
1258                 ERROR("%s is not a block device or file\n", argv[optind]);
1259                 return -1;
1260         }
1261         err = swapon(argv[optind], flags);
1262         if (err) {
1263                 ERROR("failed to swapon %s (%d)\n", argv[optind], err);
1264                 return err;
1265         }
1266
1267         return 0;
1268 }
1269
1270 static int main_swapoff(int argc, char **argv)
1271 {
1272         if (argc != 2) {
1273                 ERROR("Usage: swapoff [-a] [DEVICE]\n\n"
1274                         "\tStop swapping on DEVICE\n"
1275                         " -a\tStop swapping on all swap devices\n");
1276                 return -1;
1277         }
1278
1279         if (!strcmp(argv[1], "-a")) {
1280                 FILE *fp = fopen("/proc/swaps", "r");
1281                 char line[256];
1282
1283                 if (!fp) {
1284                         ERROR("failed to open /proc/swaps\n");
1285                         return -1;
1286                 }
1287                 fgets(line, sizeof(line), fp);
1288                 while (fgets(line, sizeof(line), fp)) {
1289                         char *end = strchr(line, ' ');
1290                         int err;
1291
1292                         if (!end)
1293                                 continue;
1294                         *end = '\0';
1295                         err = swapoff(line);
1296                         if (err)
1297                                 ERROR("failed to swapoff %s (%d)\n", line, err);
1298                 }
1299                 fclose(fp);
1300         } else {
1301                 struct stat s;
1302                 int err;
1303
1304                 if (stat(argv[1], &s) || (!S_ISBLK(s.st_mode) && !S_ISREG(s.st_mode))) {
1305                         ERROR("%s is not a block device or file\n", argv[1]);
1306                         return -1;
1307                 }
1308                 err = swapoff(argv[1]);
1309                 if (err) {
1310                         ERROR("fsiled to swapoff %s (%d)\n", argv[1], err);
1311                         return err;
1312                 }
1313         }
1314
1315         return 0;
1316 }
1317
1318 int main(int argc, char **argv)
1319 {
1320         char *base = basename(*argv);
1321
1322         umask(0);
1323
1324         if (!strcmp(base, "swapon"))
1325                 return main_swapon(argc, argv);
1326
1327         if (!strcmp(base, "swapoff"))
1328                 return main_swapoff(argc, argv);
1329
1330         if ((argc > 1) && !strcmp(base, "block")) {
1331                 if (!strcmp(argv[1], "info"))
1332                         return main_info(argc, argv);
1333
1334                 if (!strcmp(argv[1], "detect"))
1335                         return main_detect(argc, argv);
1336
1337                 if (!strcmp(argv[1], "hotplug"))
1338                         return main_hotplug(argc, argv);
1339
1340                 if (!strcmp(argv[1], "extroot"))
1341                         return main_extroot(argc, argv);
1342
1343                 if (!strcmp(argv[1], "mount"))
1344                         return main_mount(argc, argv);
1345
1346                 if (!strcmp(argv[1], "umount"))
1347                         return main_umount(argc, argv);
1348         }
1349
1350         fprintf(stderr, "Usage: block <info|mount|umount|detect>\n");
1351
1352         return -1;
1353 }