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                 vlist_add(&mounts, &m->node, (m->uuid) ? (m->uuid) : (m->device));
 300
 301         return 0;
 302 }
 303
 304 static int global_add(struct uci_section *s)
 305 {
 306         struct blob_attr *tb[__CFG_MAX] = { 0 };
 307
 308         blob_buf_init(&b, 0);
 309         uci_to_blob(&b, s, &config_attr_list);
 310         blobmsg_parse(config_policy, __CFG_MAX, tb, blob_data(b.head), blob_len(b.head));
 311
 312         if ((tb[CFG_ANON_MOUNT]) && blobmsg_get_u32(tb[CFG_ANON_MOUNT]))
 313                 anon_mount = 1;
 314         if ((tb[CFG_ANON_SWAP]) && blobmsg_get_u32(tb[CFG_ANON_SWAP]))
 315                 anon_swap = 1;
 316
 317         if ((tb[CFG_AUTO_MOUNT]) && blobmsg_get_u32(tb[CFG_AUTO_MOUNT]))
 318                 auto_mount = 1;
 319         if ((tb[CFG_AUTO_SWAP]) && blobmsg_get_u32(tb[CFG_AUTO_SWAP]))
 320                 auto_swap = 1;
 321
 322         if (tb[CFG_DELAY_ROOT])
 323                 delay_root = blobmsg_get_u32(tb[CFG_DELAY_ROOT]);
 324
 325         if ((tb[CFG_CHECK_FS]) && blobmsg_get_u32(tb[CFG_CHECK_FS]))
 326                 check_fs = 1;
 327
 328         return 0;
 329 }
 330
 331 static struct mount* find_swap(const char *uuid, const char *device)
 332 {
 333         struct mount *m;
 334
 335         vlist_for_each_element(&mounts, m, node) {
 336                 if (m->type != TYPE_SWAP)
 337                         continue;
 338                 if (uuid && m->uuid && !strcmp(m->uuid, uuid))
 339                         return m;
 340                 if (device && m->device && !strcmp(m->device, device))
 341                         return m;
 342         }
 343
 344         return NULL;
 345 }
 346
 347 static struct mount* find_block(const char *uuid, const char *label, const char *device,
 348                                 const char *target)
 349 {
 350         struct mount *m;
 351
 352         vlist_for_each_element(&mounts, m, node) {
 353                 if (m->type != TYPE_MOUNT)
 354                         continue;
 355                 if (m->uuid && uuid && !strcmp(m->uuid, uuid))
 356                         return m;
 357                 if (m->label && label && !strcmp(m->label, label))
 358                         return m;
 359                 if (m->target && target && !strcmp(m->target, target))
 360                         return m;
 361                 if (m->device && device && !strcmp(m->device, device))
 362                         return m;
 363         }
 364
 365         return NULL;
 366 }
 367
 368 static void mounts_update(struct vlist_tree *tree, struct vlist_node *node_new,
 369                           struct vlist_node *node_old)
 370 {
 371 }
 372
 373 static int config_load(char *cfg)
 374 {
 375         struct uci_context *ctx;
 376         struct uci_package *pkg;
 377         struct uci_element *e;
 378
 379         vlist_init(&mounts, avl_strcmp, mounts_update);
 380
 381         ctx = uci_alloc_context();
 382         if (cfg) {
 383                 char path[32];
 384                 snprintf(path, 32, "%s/etc/config", cfg);
 385                 uci_set_confdir(ctx, path);
 386         }
 387
 388         if (uci_load(ctx, "fstab", &pkg))
 389                 return -1;
 390
 391         vlist_update(&mounts);
 392         uci_foreach_element(&pkg->sections, e) {
 393                 struct uci_section *s = uci_to_section(e);
 394
 395                 if (!strcmp(s->type, "mount"))
 396                         mount_add(s);
 397                 if (!strcmp(s->type, "swap"))
 398                         swap_add(s);
 399                 if (!strcmp(s->type, "global"))
 400                         global_add(s);
 401         }
 402         vlist_flush(&mounts);
 403
 404         return 0;
 405 }
 406
 407 static int _cache_load(const char *path)
 408 {
 409         int gl_flags = GLOB_NOESCAPE | GLOB_MARK;
 410         int j;
 411         glob_t gl;
 412
 413         if (glob(path, gl_flags, NULL, &gl) < 0)
 414                 return -1;
 415
 416         for (j = 0; j < gl.gl_pathc; j++) {
 417                 struct blkid_struct_probe *pr = malloc(sizeof(struct blkid_struct_probe));
 418                 memset(pr, 0, sizeof(struct blkid_struct_probe));
 419                 probe_block(gl.gl_pathv[j], pr);
 420                 if (pr->err || !pr->id)
 421                         free(pr);
 422                 else
 423                         list_add_tail(&pr->list, &devices);
 424         }
 425
 426         globfree(&gl);
 427
 428         return 0;
 429 }
 430
 431 static void cache_load(int mtd)
 432 {
 433         if (mtd)
 434                 _cache_load("/dev/mtdblock*");
 435         _cache_load("/dev/mmcblk*");
 436         _cache_load("/dev/sd*");
 437         _cache_load("/dev/sdc*");
 438         _cache_load("/dev/hd*");
 439         _cache_load("/dev/md*");
 440         _cache_load("/dev/mapper/*");
 441 }
 442
 443 static int print_block_info(struct blkid_struct_probe *pr)
 444 {
 445         printf("%s:", pr->dev);
 446         if (pr->uuid[0])
 447                 printf(" UUID=\"%s\"", pr->uuid);
 448
 449         if (pr->label[0])
 450                 printf(" LABEL=\"%s\"", pr->label);
 451
 452         if (pr->name[0])
 453                 printf(" NAME=\"%s\"", pr->name);
 454
 455         if (pr->version[0])
 456                 printf(" VERSION=\"%s\"", pr->version);
 457
 458         printf(" TYPE=\"%s\"\n", pr->id->name);
 459
 460         return 0;
 461 }
 462
 463 static int print_block_uci(struct blkid_struct_probe *pr)
 464 {
 465         if (!strcmp(pr->id->name, "swap")) {
 466                 printf("config 'swap'\n");
 467         } else {
 468                 printf("config 'mount'\n");
 469                 printf("\toption\ttarget\t'/mnt/%s'\n", basename(pr->dev));
 470         }
 471         if (pr->uuid[0])
 472                 printf("\toption\tuuid\t'%s'\n", pr->uuid);
 473         else
 474                 printf("\toption\tdevice\t'%s'\n", pr->dev);
 475         printf("\toption\tenabled\t'0'\n\n");
 476
 477         return 0;
 478 }
 479
 480 static struct blkid_struct_probe* find_block_info(char *uuid, char *label, char *path)
 481 {
 482         struct blkid_struct_probe *pr = NULL;
 483
 484         if (uuid)
 485                 list_for_each_entry(pr, &devices, list)
 486                         if (!strcmp(pr->uuid, uuid))
 487                                 return pr;
 488
 489         if (label)
 490                 list_for_each_entry(pr, &devices, list)
 491                         if (strcmp(pr->label, label))
 492                                 return pr;
 493
 494         if (path)
 495                 list_for_each_entry(pr, &devices, list)
 496                         if (!strcmp(pr->dev, path))
 497                                 return pr;
 498
 499         return NULL;
 500 }
 501
 502 static char* find_mount_point(char *block)
 503 {
 504         FILE *fp = fopen("/proc/mounts", "r");
 505         static char line[256];
 506         int len = strlen(block);
 507         char *point = NULL;
 508
 509         if(!fp)
 510                 return NULL;
 511
 512         while (fgets(line, sizeof(line), fp)) {
 513                 if (!strncmp(line, block, len)) {
 514                         char *p = &line[len + 1];
 515                         char *t = strstr(p, " ");
 516
 517                         if (!t)
 518                                 return NULL;
 519                         *t = '\0';
 520                         point = p;
 521                         break;
 522                 }
 523         }
 524
 525         fclose(fp);
 526
 527         return point;
 528 }
 529
 530 static void mkdir_p(char *dir)
 531 {
 532         char *l = strrchr(dir, '/');
 533
 534         if (l) {
 535                 *l = '\0';
 536                 mkdir_p(dir);
 537                 *l = '/';
 538                 mkdir(dir, 0755);
 539         }
 540 }
 541
 542 static void check_filesystem(struct blkid_struct_probe *pr)
 543 {
 544         pid_t pid;
 545         struct stat statbuf;
 546         char *e2fsck = "/usr/sbin/e2fsck";
 547
 548         if (strncmp(pr->id->name, "ext", 3)) {
 549                 fprintf(stderr, "check_filesystem: %s is not supported\n", pr->id->name);
 550                 return;
 551         }
 552
 553         if (stat(e2fsck, &statbuf) < 0) {
 554                 fprintf(stderr, "check_filesystem: %s not found\n", e2fsck);
 555                 return;
 556         }
 557
 558         pid = fork();
 559         if (!pid) {
 560                 execl(e2fsck, e2fsck, "-p", pr->dev, NULL);
 561                 exit(-1);
 562         } else if (pid > 0) {
 563                 int status;
 564
 565                 waitpid(pid, &status, 0);
 566                 if (WEXITSTATUS(status))
 567                         fprintf(stderr, "check_filesystem: %s returned %d\n", e2fsck, WEXITSTATUS(status));
 568         }
 569 }
 570
 571 static int mount_device(struct blkid_struct_probe *pr, int hotplug)
 572 {
 573         struct mount *m;
 574         char *device;
 575
 576         if (!pr)
 577                 return -1;
 578
 579         device = basename(pr->dev);
 580
 581         if (!strcmp(pr->id->name, "swap")) {
 582                 if (hotplug && !auto_swap)
 583                         return -1;
 584                 m = find_swap(pr->uuid, device);
 585                 if (m || anon_swap)
 586                         swapon(pr->dev, (m) ? (m->prio) : (0));
 587
 588                 return 0;
 589         }
 590
 591         if (hotplug && !auto_mount)
 592                 return -1;
 593
 594         if (find_mount_point(pr->dev)) {
 595                 fprintf(stderr, "%s is already mounted\n", pr->dev);
 596                 return -1;
 597         }
 598
 599         m = find_block(pr->uuid, pr->label, device, NULL);
 600         if (m && m->extroot)
 601                 return -1;
 602
 603         if (m) {
 604                 char *target = m->target;
 605                 char _target[32];
 606                 int err = 0;
 607
 608                 if (!target) {
 609                         snprintf(_target, sizeof(_target), "/mnt/%s", device);
 610                         target = _target;
 611                 }
 612                 mkdir_p(target);
 613
 614                 if (check_fs)
 615                         check_filesystem(pr);
 616
 617                 err = mount(pr->dev, target, pr->id->name, m->flags,
 618                             (m->options) ? (m->options) : (""));
 619                 if (err)
 620                         fprintf(stderr, "mounting %s (%s) as %s failed (%d) - %s\n",
 621                                         pr->dev, pr->id->name, target, err, strerror(err));
 622                 return err;
 623         }
 624
 625         if (anon_mount) {
 626                 char target[] = "/mnt/mmcblk123";
 627                 int err = 0;
 628
 629                 snprintf(target, sizeof(target), "/mnt/%s", device);
 630                 mkdir_p(target);
 631
 632                 if (check_fs)
 633                         check_filesystem(pr);
 634
 635                 err = mount(pr->dev, target, pr->id->name, 0, "");
 636                 if (err)
 637                         fprintf(stderr, "mounting %s (%s) as %s failed (%d) - %s\n",
 638                                         pr->dev, pr->id->name, target, err, strerror(err));
 639                 return err;
 640         }
 641
 642         return 0;
 643 }
 644
 645 static int umount_device(struct blkid_struct_probe *pr)
 646 {
 647         struct mount *m;
 648         char *device = basename(pr->dev);
 649         char *mp;
 650         int err;
 651
 652         if (!pr)
 653                 return -1;
 654
 655         if (!strcmp(pr->id->name, "swap"))
 656                 return -1;
 657
 658         mp = find_mount_point(pr->dev);
 659         if (!mp)
 660                 return -1;
 661
 662         m = find_block(pr->uuid, pr->label, device, NULL);
 663         if (m && m->extroot)
 664                 return -1;
 665
 666         err = umount2(mp, MNT_DETACH);
 667         if (err)
 668                 fprintf(stderr, "unmounting %s (%s)  failed (%d) - %s\n",
 669                         pr->dev, mp, err, strerror(err));
 670         else
 671                 fprintf(stderr, "unmounted %s (%s)\n",
 672                         pr->dev, mp);
 673
 674         return err;
 675 }
 676
 677 static int main_hotplug(int argc, char **argv)
 678 {
 679         char path[32];
 680         char *action, *device, *mount_point;
 681
 682         action = getenv("ACTION");
 683         device = getenv("DEVNAME");
 684
 685         if (!action || !device)
 686                 return -1;
 687         snprintf(path, sizeof(path), "/dev/%s", device);
 688
 689         if (!strcmp(action, "remove")) {
 690                 int err = 0;
 691                 mount_point = find_mount_point(path);
 692                 if (mount_point)
 693                         err = umount2(mount_point, MNT_DETACH);
 694
 695                 if (err)
 696                         fprintf(stderr, "umount of %s failed (%d) - %s\n",
 697                                         mount_point, err, strerror(err));
 698
 699                 return 0;
 700         } else if (strcmp(action, "add")) {
 701                 fprintf(stderr, "Unkown action %s\n", action);
 702
 703                 return -1;
 704         }
 705
 706         if (config_load(NULL))
 707                 return -1;
 708         cache_load(0);
 709
 710         return mount_device(find_block_info(NULL, NULL, path), 1);
 711 }
 712
 713 static int find_block_mtd(char *name, char *part, int plen)
 714 {
 715         FILE *fp = fopen("/proc/mtd", "r");
 716         static char line[256];
 717         char *index = NULL;
 718
 719         if(!fp)
 720                 return -1;
 721
 722         while (!index && fgets(line, sizeof(line), fp)) {
 723                 if (strstr(line, name)) {
 724                         char *eol = strstr(line, ":");
 725
 726                         if (!eol)
 727                                 continue;
 728
 729                         *eol = '\0';
 730                         index = &line[3];
 731                 }
 732         }
 733
 734         fclose(fp);
 735
 736         if (!index)
 737                 return -1;
 738
 739         snprintf(part, plen, "/dev/mtdblock%s", index);
 740
 741         return 0;
 742 }
 743
 744 static int check_extroot(char *path)
 745 {
 746         struct blkid_struct_probe *pr = NULL;
 747         char fs[32];
 748
 749         if (find_block_mtd("rootfs", fs, sizeof(fs)))
 750                 return -1;
 751
 752         list_for_each_entry(pr, &devices, list) {
 753                 if (!strcmp(pr->dev, fs)) {
 754                         struct stat s;
 755                         FILE *fp = NULL;
 756                         char tag[64];
 757                         char uuid[64] = { 0 };
 758
 759                         snprintf(tag, sizeof(tag), "%s/etc/.extroot-uuid", path);
 760                         if (stat(tag, &s)) {
 761                                 fp = fopen(tag, "w+");
 762                                 if (!fp) {
 763                                         fprintf(stderr, "extroot: failed to write uuid tag file\n");
 764                                         /* return 0 to continue boot regardless of error */
 765                                         return 0;
 766                                 }
 767                                 fputs(pr->uuid, fp);
 768                                 fclose(fp);
 769                                 return 0;
 770                         }
 771
 772                         fp = fopen(tag, "r");
 773                         if (!fp) {
 774                                 fprintf(stderr, "extroot: failed to open uuid tag file\n");
 775                                 return -1;
 776                         }
 777
 778                         fgets(uuid, sizeof(uuid), fp);
 779                         fclose(fp);
 780                         if (!strcmp(uuid, pr->uuid))
 781                                 return 0;
 782                         fprintf(stderr, "extroot: uuid tag does not match rom uuid\n");
 783                 }
 784         }
 785         return -1;
 786 }
 787
 788 static int mount_extroot(char *cfg)
 789 {
 790         char overlay[] = "/tmp/extroot/overlay";
 791         char mnt[] = "/tmp/extroot/mnt";
 792         char *path = mnt;
 793         struct blkid_struct_probe *pr;
 794         struct mount *m;
 795         int err = -1;
 796
 797         if (config_load(cfg))
 798                 return -2;
 799
 800         m = find_block(NULL, NULL, NULL, "/");
 801         if (!m)
 802                 m = find_block(NULL, NULL, NULL, "/overlay");
 803
 804         if (!m || !m->extroot)
 805                 return -1;
 806
 807         pr = find_block_info(m->uuid, m->label, NULL);
 808
 809         if (!pr && delay_root){
 810                 fprintf(stderr, "extroot: is not ready yet, retrying in %u seconds\n", delay_root);
 811                 sleep(delay_root);
 812                 mkblkdev();
 813                 cache_load(0);
 814                 pr = find_block_info(m->uuid, m->label, NULL);
 815         }
 816         if (pr) {
 817                 if (strncmp(pr->id->name, "ext", 3)) {
 818                         fprintf(stderr, "extroot: %s is not supported, try ext4\n", pr->id->name);
 819                         return -1;
 820                 }
 821                 if (m->overlay)
 822                         path = overlay;
 823                 mkdir_p(path);
 824
 825                 if (check_fs)
 826                         check_filesystem(pr);
 827
 828                 err = mount(pr->dev, path, pr->id->name, 0, (m->options) ? (m->options) : (""));
 829
 830                 if (err) {
 831                         fprintf(stderr, "mounting %s (%s) as %s failed (%d) - %s\n",
 832                                         pr->dev, pr->id->name, path, err, strerror(err));
 833                 } else if (m->overlay) {
 834                         err = check_extroot(path);
 835                         if (err)
 836                                 umount(path);
 837                 }
 838         }
 839
 840         return err;
 841 }
 842
 843 static int main_extroot(int argc, char **argv)
 844 {
 845         struct blkid_struct_probe *pr;
 846         char fs[32] = { 0 };
 847         char fs_data[32] = { 0 };
 848         int err = -1;
 849
 850         if (!getenv("PREINIT"))
 851                 return -1;
 852
 853         if (argc != 2) {
 854                 fprintf(stderr, "Usage: block extroot mountpoint\n");
 855                 return -1;
 856         }
 857
 858         mkblkdev();
 859         cache_load(1);
 860
 861         find_block_mtd("rootfs", fs, sizeof(fs));
 862         if (!fs[0])
 863                 return -2;
 864
 865         pr = find_block_info(NULL, NULL, fs);
 866         if (!pr)
 867                 return -3;
 868
 869         find_block_mtd("rootfs_data", fs_data, sizeof(fs_data));
 870         if (fs_data[0]) {
 871                 pr = find_block_info(NULL, NULL, fs_data);
 872                 if (pr && !strcmp(pr->id->name, "jffs2")) {
 873                         char cfg[] = "/tmp/jffs_cfg";
 874
 875                         mkdir_p(cfg);
 876                         if (!mount(fs_data, cfg, "jffs2", MS_NOATIME, NULL)) {
 877                                 err = mount_extroot(cfg);
 878                                 umount2(cfg, MNT_DETACH);
 879                         }
 880                         if (err < 0)
 881                                 rmdir("/tmp/overlay");
 882                         rmdir(cfg);
 883                         return err;
 884                 }
 885         }
 886
 887         return mount_extroot(NULL);
 888 }
 889
 890 static int main_mount(int argc, char **argv)
 891 {
 892         struct blkid_struct_probe *pr;
 893
 894         if (config_load(NULL))
 895                 return -1;
 896
 897         cache_load(1);
 898         list_for_each_entry(pr, &devices, list)
 899                 mount_device(pr, 0);
 900
 901         return 0;
 902 }
 903
 904 static int main_umount(int argc, char **argv)
 905 {
 906         struct blkid_struct_probe *pr;
 907
 908         if (config_load(NULL))
 909                 return -1;
 910
 911         cache_load(0);
 912         list_for_each_entry(pr, &devices, list)
 913                 umount_device(pr);
 914
 915         return 0;
 916 }
 917
 918 static int main_detect(int argc, char **argv)
 919 {
 920         struct blkid_struct_probe *pr;
 921
 922         cache_load(0);
 923         printf("config 'global'\n");
 924         printf("\toption\tanon_swap\t'0'\n");
 925         printf("\toption\tanon_mount\t'0'\n");
 926         printf("\toption\tauto_swap\t'1'\n");
 927         printf("\toption\tauto_mount\t'1'\n");
 928         printf("\toption\tdelay_root\t'5'\n");
 929         printf("\toption\tcheck_fs\t'0'\n\n");
 930         list_for_each_entry(pr, &devices, list)
 931                 print_block_uci(pr);
 932
 933         return 0;
 934 }
 935
 936 static int main_info(int argc, char **argv)
 937 {
 938         int i;
 939         struct blkid_struct_probe *pr;
 940
 941         cache_load(1);
 942         if (argc == 2) {
 943                 list_for_each_entry(pr, &devices, list)
 944                         print_block_info(pr);
 945
 946                 return 0;
 947         };
 948
 949         for (i = 2; i < argc; i++) {
 950                 struct stat s;
 951
 952                 if (stat(argv[i], &s)) {
 953                         fprintf(stderr, "failed to stat %s\n", argv[i]);
 954                         continue;
 955                 }
 956                 if (!S_ISBLK(s.st_mode)) {
 957                         fprintf(stderr, "%s is not a block device\n", argv[i]);
 958                         continue;
 959                 }
 960                 pr = find_block_info(NULL, NULL, argv[i]);
 961                 if (pr)
 962                         print_block_info(pr);
 963         }
 964
 965         return 0;
 966 }
 967
 968 static int main_swapon(int argc, char **argv)
 969 {
 970         if (argc != 2) {
 971                 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");
 972                 return -1;
 973         }
 974
 975         if (!strcmp(argv[1], "-s")) {
 976                 FILE *fp = fopen("/proc/swaps", "r");
 977                 char *lineptr = NULL;
 978                 size_t s;
 979
 980                 if (!fp) {
 981                         fprintf(stderr, "failed to open /proc/swaps\n");
 982                         return -1;
 983                 }
 984                 while (getline(&lineptr, &s, fp) > 0)
 985                         printf(lineptr);
 986                 if (lineptr)
 987                         free(lineptr);
 988                 fclose(fp);
 989         } else if (!strcmp(argv[1], "-a")) {
 990                 struct blkid_struct_probe *pr;
 991
 992                 cache_load(0);
 993                 list_for_each_entry(pr, &devices, list) {
 994                         if (strcmp(pr->id->name, "swap"))
 995                                 continue;
 996                         if (swapon(pr->dev, 0))
 997                                 fprintf(stderr, "failed to swapon %s\n", pr->dev);
 998                 }
 999         } else {
1000                 struct stat s;
1001                 int err;
1002
1003                 if (stat(argv[1], &s) || (!S_ISBLK(s.st_mode) && !S_ISREG(s.st_mode))) {
1004                         fprintf(stderr, "%s is not a block device or file\n", argv[1]);
1005                         return -1;
1006                 }
1007                 err = swapon(argv[1], 0);
1008                 if (err) {
1009                         fprintf(stderr, "failed to swapon %s (%d)\n", argv[1], err);
1010                         return err;
1011                 }
1012         }
1013
1014         return 0;
1015 }
1016
1017 static int main_swapoff(int argc, char **argv)
1018 {
1019         if (argc != 2) {
1020                 fprintf(stderr, "Usage: swapoff [-a] [DEVICE]\n\n\tStop swapping on DEVICE\n -a\tStop swapping on all swap devices\n");
1021                 return -1;
1022         }
1023
1024         if (!strcmp(argv[1], "-a")) {
1025                 FILE *fp = fopen("/proc/swaps", "r");
1026                 char line[256];
1027
1028                 if (!fp) {
1029                         fprintf(stderr, "failed to open /proc/swaps\n");
1030                         return -1;
1031                 }
1032                 fgets(line, sizeof(line), fp);
1033                 while (fgets(line, sizeof(line), fp)) {
1034                         char *end = strchr(line, ' ');
1035                         int err;
1036
1037                         if (!end)
1038                                 continue;
1039                         *end = '\0';
1040                         err = swapoff(line);
1041                         if (err)
1042                                 fprintf(stderr, "failed to swapoff %s (%d)\n", line, err);
1043                 }
1044                 fclose(fp);
1045         } else {
1046                 struct stat s;
1047                 int err;
1048
1049                 if (stat(argv[1], &s) || (!S_ISBLK(s.st_mode) && !S_ISREG(s.st_mode))) {
1050                         fprintf(stderr, "%s is not a block device or file\n", argv[1]);
1051                         return -1;
1052                 }
1053                 err = swapoff(argv[1]);
1054                 if (err) {
1055                         fprintf(stderr, "fsiled to swapoff %s (%d)\n", argv[1], err);
1056                         return err;
1057                 }
1058         }
1059
1060         return 0;
1061 }
1062
1063 int main(int argc, char **argv)
1064 {
1065         char *base = basename(*argv);
1066
1067         umask(0);
1068
1069         if (!strcmp(base, "swapon"))
1070                 return main_swapon(argc, argv);
1071
1072         if (!strcmp(base, "swapoff"))
1073                 return main_swapoff(argc, argv);
1074
1075         if ((argc > 1) && !strcmp(base, "block")) {
1076                 if (!strcmp(argv[1], "info"))
1077                         return main_info(argc, argv);
1078
1079                 if (!strcmp(argv[1], "detect"))
1080                         return main_detect(argc, argv);
1081
1082                 if (!strcmp(argv[1], "hotplug"))
1083                         return main_hotplug(argc, argv);
1084
1085                 if (!strcmp(argv[1], "extroot"))
1086                         return main_extroot(argc, argv);
1087
1088                 if (!strcmp(argv[1], "mount"))
1089                         return main_mount(argc, argv);
1090
1091                 if (!strcmp(argv[1], "umount"))
1092                         return main_umount(argc, argv);
1093         }
1094
1095         fprintf(stderr, "Usage: block <info|mount|umount|detect>\n");
1096
1097         return -1;
1098 }