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