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 #include <stdio.h>
  16 #include <unistd.h>
  17 #include <syslog.h>
  18 #include <libgen.h>
  19 #include <glob.h>
  20
  21 #include <sys/stat.h>
  22 #include <sys/types.h>
  23 #include <sys/swap.h>
  24 #include <sys/mount.h>
  25 #include <sys/wait.h>
  26
  27 #include <uci.h>
  28 #include <uci_blob.h>
  29
  30 #include <libubox/list.h>
  31 #include <libubox/vlist.h>
  32 #include <libubox/blobmsg_json.h>
  33 #include <libubox/avl-cmp.h>
  34
  35 #include "libblkid-tiny/libblkid-tiny.h"
  36
  37 enum {
  38         TYPE_MOUNT,
  39         TYPE_SWAP,
  40 };
  41
  42 struct mount {
  43         struct vlist_node node;
  44         int type;
  45
  46         char *target;
  47         char *path;
  48         char *options;
  49         char *uuid;
  50         char *label;
  51         char *device;
  52         int extroot;
  53         int overlay;
  54         int disabled_fsck;
  55         unsigned int prio;
  56 };
  57
  58 static struct vlist_tree mounts;
  59 static struct blob_buf b;
  60 static LIST_HEAD(devices);
  61 static int anon_mount, anon_swap, auto_mount, auto_swap, check_fs;
  62 static unsigned int delay_root;
  63
  64 enum {
  65         CFG_ANON_MOUNT,
  66         CFG_ANON_SWAP,
  67         CFG_AUTO_MOUNT,
  68         CFG_AUTO_SWAP,
  69         CFG_DELAY_ROOT,
  70         CFG_CHECK_FS,
  71         __CFG_MAX
  72 };
  73
  74 static const struct blobmsg_policy config_policy[__CFG_MAX] = {
  75         [CFG_ANON_SWAP] = { .name = "anon_swap", .type = BLOBMSG_TYPE_INT32 },
  76         [CFG_ANON_MOUNT] = { .name = "anon_mount", .type = BLOBMSG_TYPE_INT32 },
  77         [CFG_AUTO_SWAP] = { .name = "auto_swap", .type = BLOBMSG_TYPE_INT32 },
  78         [CFG_AUTO_MOUNT] = { .name = "auto_mount", .type = BLOBMSG_TYPE_INT32 },
  79         [CFG_DELAY_ROOT] = { .name = "delay_root", .type = BLOBMSG_TYPE_INT32 },
  80         [CFG_CHECK_FS] = { .name = "check_fs", .type = BLOBMSG_TYPE_INT32 },
  81 };
  82
  83 enum {
  84         MOUNT_UUID,
  85         MOUNT_LABEL,
  86         MOUNT_ENABLE,
  87         MOUNT_TARGET,
  88         MOUNT_DEVICE,
  89         MOUNT_OPTIONS,
  90         __MOUNT_MAX
  91 };
  92
  93 static const struct uci_blob_param_list config_attr_list = {
  94         .n_params = __CFG_MAX,
  95         .params = config_policy,
  96 };
  97
  98 static const struct blobmsg_policy mount_policy[__MOUNT_MAX] = {
  99         [MOUNT_UUID] = { .name = "uuid", .type = BLOBMSG_TYPE_STRING },
 100         [MOUNT_LABEL] = { .name = "label", .type = BLOBMSG_TYPE_STRING },
 101         [MOUNT_DEVICE] = { .name = "device", .type = BLOBMSG_TYPE_STRING },
 102         [MOUNT_TARGET] = { .name = "target", .type = BLOBMSG_TYPE_STRING },
 103         [MOUNT_OPTIONS] = { .name = "options", .type = BLOBMSG_TYPE_STRING },
 104         [MOUNT_ENABLE] = { .name = "enabled", .type = BLOBMSG_TYPE_INT32 },
 105 };
 106
 107 static const struct uci_blob_param_list mount_attr_list = {
 108         .n_params = __MOUNT_MAX,
 109         .params = mount_policy,
 110 };
 111
 112 enum {
 113         SWAP_ENABLE,
 114         SWAP_UUID,
 115         SWAP_DEVICE,
 116         SWAP_PRIO,
 117         __SWAP_MAX
 118 };
 119
 120 static const struct blobmsg_policy swap_policy[__SWAP_MAX] = {
 121         [SWAP_ENABLE] = { .name = "enabled", .type = BLOBMSG_TYPE_INT32 },
 122         [SWAP_UUID] = { .name = "uuid", .type = BLOBMSG_TYPE_STRING },
 123         [SWAP_DEVICE] = { .name = "device", .type = BLOBMSG_TYPE_STRING },
 124         [SWAP_PRIO] = { .name = "priority", .type = BLOBMSG_TYPE_INT32 },
 125 };
 126
 127 static const struct uci_blob_param_list swap_attr_list = {
 128         .n_params = __SWAP_MAX,
 129         .params = swap_policy,
 130 };
 131
 132 static char *blobmsg_get_strdup(struct blob_attr *attr)
 133 {
 134         if (!attr)
 135                 return NULL;
 136
 137         return strdup(blobmsg_get_string(attr));
 138 }
 139
 140 static char *blobmsg_get_basename(struct blob_attr *attr)
 141 {
 142         if (!attr)
 143                 return NULL;
 144
 145         return strdup(basename(blobmsg_get_string(attr)));
 146 }
 147
 148 static int mount_add(struct uci_section *s)
 149 {
 150         struct blob_attr *tb[__MOUNT_MAX] = { 0 };
 151         struct mount *m;
 152
 153         blob_buf_init(&b, 0);
 154         uci_to_blob(&b, s, &mount_attr_list);
 155         blobmsg_parse(mount_policy, __MOUNT_MAX, tb, blob_data(b.head), blob_len(b.head));
 156
 157         if (!tb[MOUNT_LABEL] && !tb[MOUNT_UUID] && !tb[MOUNT_DEVICE])
 158                 return -1;
 159
 160         if (tb[MOUNT_ENABLE] && !blobmsg_get_u32(tb[MOUNT_ENABLE]))
 161                 return -1;
 162
 163         m = malloc(sizeof(struct mount));
 164         m->type = TYPE_MOUNT;
 165         m->uuid = blobmsg_get_strdup(tb[MOUNT_UUID]);
 166         m->label = blobmsg_get_strdup(tb[MOUNT_LABEL]);
 167         m->target = blobmsg_get_strdup(tb[MOUNT_TARGET]);
 168         m->options = blobmsg_get_strdup(tb[MOUNT_OPTIONS]);
 169         m->device = blobmsg_get_basename(tb[MOUNT_DEVICE]);
 170         m->overlay = m->extroot = 0;
 171         if (m->target && !strcmp(m->target, "/"))
 172                 m->extroot = 1;
 173         if (m->target && !strcmp(m->target, "/overlay"))
 174                 m->extroot = m->overlay = 1;
 175
 176         if (m->uuid)
 177                 vlist_add(&mounts, &m->node, m->uuid);
 178         else if (m->label)
 179                 vlist_add(&mounts, &m->node, m->label);
 180         else if (m->device)
 181                 vlist_add(&mounts, &m->node, m->device);
 182
 183         return 0;
 184 }
 185
 186 static int swap_add(struct uci_section *s)
 187 {
 188         struct blob_attr *tb[__SWAP_MAX] = { 0 };
 189         struct mount *m;
 190
 191         blob_buf_init(&b, 0);
 192         uci_to_blob(&b, s, &swap_attr_list);
 193         blobmsg_parse(swap_policy, __SWAP_MAX, tb, blob_data(b.head), blob_len(b.head));
 194
 195         if (!tb[SWAP_UUID] && !tb[SWAP_DEVICE])
 196                 return -1;
 197
 198         m = malloc(sizeof(struct mount));
 199         memset(m, 0, sizeof(struct mount));
 200         m->type = TYPE_SWAP;
 201         m->uuid = blobmsg_get_strdup(tb[SWAP_UUID]);
 202         m->device = blobmsg_get_basename(tb[SWAP_DEVICE]);
 203         if (tb[SWAP_PRIO])
 204                 m->prio = blobmsg_get_u32(tb[SWAP_PRIO]);
 205         if (m->prio)
 206                 m->prio = ((m->prio << SWAP_FLAG_PRIO_SHIFT) & SWAP_FLAG_PRIO_MASK) | SWAP_FLAG_PREFER;
 207
 208         if ((!tb[SWAP_ENABLE]) || blobmsg_get_u32(tb[SWAP_ENABLE]))
 209                 vlist_add(&mounts, &m->node, (m->uuid) ? (m->uuid) : (m->device));
 210
 211         return 0;
 212 }
 213
 214 static int global_add(struct uci_section *s)
 215 {
 216         struct blob_attr *tb[__CFG_MAX] = { 0 };
 217
 218         blob_buf_init(&b, 0);
 219         uci_to_blob(&b, s, &config_attr_list);
 220         blobmsg_parse(config_policy, __CFG_MAX, tb, blob_data(b.head), blob_len(b.head));
 221
 222         if ((tb[CFG_ANON_MOUNT]) && blobmsg_get_u32(tb[CFG_ANON_MOUNT]))
 223                 anon_mount = 1;
 224         if ((tb[CFG_ANON_SWAP]) && blobmsg_get_u32(tb[CFG_ANON_SWAP]))
 225                 anon_swap = 1;
 226
 227         if ((tb[CFG_AUTO_MOUNT]) && blobmsg_get_u32(tb[CFG_AUTO_MOUNT]))
 228                 auto_mount = 1;
 229         if ((tb[CFG_AUTO_SWAP]) && blobmsg_get_u32(tb[CFG_AUTO_SWAP]))
 230                 auto_swap = 1;
 231
 232         if (tb[CFG_DELAY_ROOT])
 233                 delay_root = blobmsg_get_u32(tb[CFG_DELAY_ROOT]);
 234
 235         if ((tb[CFG_CHECK_FS]) && blobmsg_get_u32(tb[CFG_CHECK_FS]))
 236                 check_fs = 1;
 237
 238         return 0;
 239 }
 240
 241 static struct mount* find_swap(const char *uuid, const char *device)
 242 {
 243         struct mount *m;
 244
 245         vlist_for_each_element(&mounts, m, node) {
 246                 if (m->type != TYPE_SWAP)
 247                         continue;
 248                 if (uuid && m->uuid && !strcmp(m->uuid, uuid))
 249                         return m;
 250                 if (device && m->device && !strcmp(m->device, device))
 251                         return m;
 252         }
 253
 254         return NULL;
 255 }
 256
 257 static struct mount* find_block(const char *uuid, const char *label, const char *device,
 258                                 const char *target)
 259 {
 260         struct mount *m;
 261
 262         vlist_for_each_element(&mounts, m, node) {
 263                 if (m->type != TYPE_MOUNT)
 264                         continue;
 265                 if (m->uuid && uuid && !strcmp(m->uuid, uuid))
 266                         return m;
 267                 if (m->label && label && !strcmp(m->label, label))
 268                         return m;
 269                 if (m->target && target && !strcmp(m->target, target))
 270                         return m;
 271                 if (m->device && device && !strcmp(m->device, device))
 272                         return m;
 273         }
 274
 275         return NULL;
 276 }
 277
 278 static void mounts_update(struct vlist_tree *tree, struct vlist_node *node_new,
 279                           struct vlist_node *node_old)
 280 {
 281 }
 282
 283 static int config_load(char *cfg)
 284 {
 285         struct uci_context *ctx;
 286         struct uci_package *pkg;
 287         struct uci_element *e;
 288
 289         vlist_init(&mounts, avl_strcmp, mounts_update);
 290
 291         ctx = uci_alloc_context();
 292         if (cfg) {
 293                 char path[32];
 294                 snprintf(path, 32, "%s/etc/config", cfg);
 295                 uci_set_confdir(ctx, path);
 296         }
 297
 298         if (uci_load(ctx, "fstab", &pkg))
 299                 return -1;
 300
 301         vlist_update(&mounts);
 302         uci_foreach_element(&pkg->sections, e) {
 303                 struct uci_section *s = uci_to_section(e);
 304
 305                 if (!strcmp(s->type, "mount"))
 306                         mount_add(s);
 307                 if (!strcmp(s->type, "swap"))
 308                         swap_add(s);
 309                 if (!strcmp(s->type, "global"))
 310                         global_add(s);
 311         }
 312         vlist_flush(&mounts);
 313
 314         return 0;
 315 }
 316
 317 static int _cache_load(const char *path)
 318 {
 319         int gl_flags = GLOB_NOESCAPE | GLOB_MARK;
 320         int j;
 321         glob_t gl;
 322
 323         if (glob(path, gl_flags, NULL, &gl) < 0)
 324                 return -1;
 325
 326         for (j = 0; j < gl.gl_pathc; j++) {
 327                 struct blkid_struct_probe *pr = malloc(sizeof(struct blkid_struct_probe));
 328                 memset(pr, 0, sizeof(struct blkid_struct_probe));
 329                 probe_block(gl.gl_pathv[j], pr);
 330                 if (pr->err || !pr->id)
 331                         free(pr);
 332                 else
 333                         list_add_tail(&pr->list, &devices);
 334         }
 335
 336         globfree(&gl);
 337
 338         return 0;
 339 }
 340
 341 static void cache_load(int mtd)
 342 {
 343         if (mtd)
 344                 _cache_load("/dev/mtdblock*");
 345         _cache_load("/dev/mmcblk*");
 346         _cache_load("/dev/sd*");
 347         _cache_load("/dev/sdc*");
 348         _cache_load("/dev/hd*");
 349         _cache_load("/dev/md*");
 350         _cache_load("/dev/mapper/*");
 351 }
 352
 353 static int print_block_info(struct blkid_struct_probe *pr)
 354 {
 355         printf("%s:", pr->dev);
 356         if (pr->uuid[0])
 357                 printf(" UUID=\"%s\"", pr->uuid);
 358
 359         if (pr->label[0])
 360                 printf(" LABEL=\"%s\"", pr->label);
 361
 362         if (pr->name[0])
 363                 printf(" NAME=\"%s\"", pr->name);
 364
 365         if (pr->version[0])
 366                 printf(" VERSION=\"%s\"", pr->version);
 367
 368         printf(" TYPE=\"%s\"\n", pr->id->name);
 369
 370         return 0;
 371 }
 372
 373 static int print_block_uci(struct blkid_struct_probe *pr)
 374 {
 375         if (!strcmp(pr->id->name, "swap")) {
 376                 printf("config 'swap'\n");
 377         } else {
 378                 printf("config 'mount'\n");
 379                 printf("\toption\ttarget\t'/mnt/%s'\n", basename(pr->dev));
 380         }
 381         if (pr->uuid[0])
 382                 printf("\toption\tuuid\t'%s'\n", pr->uuid);
 383         else
 384                 printf("\toption\tdevice\t'%s'\n", pr->dev);
 385         printf("\toption\tenabled\t'0'\n\n");
 386
 387         return 0;
 388 }
 389
 390 static struct blkid_struct_probe* find_block_info(char *uuid, char *label, char *path)
 391 {
 392         struct blkid_struct_probe *pr = NULL;
 393
 394         if (uuid)
 395                 list_for_each_entry(pr, &devices, list)
 396                         if (!strcmp(pr->uuid, uuid))
 397                                 return pr;
 398
 399         if (label)
 400                 list_for_each_entry(pr, &devices, list)
 401                         if (strcmp(pr->label, label))
 402                                 return pr;
 403
 404         if (path)
 405                 list_for_each_entry(pr, &devices, list)
 406                         if (!strcmp(pr->dev, path))
 407                                 return pr;
 408
 409         return NULL;
 410 }
 411
 412 static char* find_mount_point(char *block)
 413 {
 414         FILE *fp = fopen("/proc/mounts", "r");
 415         static char line[256];
 416         int len = strlen(block);
 417         char *point = NULL;
 418
 419         if(!fp)
 420                 return NULL;
 421
 422         while (fgets(line, sizeof(line), fp)) {
 423                 if (!strncmp(line, block, len)) {
 424                         char *p = &line[len + 1];
 425                         char *t = strstr(p, " ");
 426
 427                         if (!t)
 428                                 return NULL;
 429                         *t = '\0';
 430                         point = p;
 431                         break;
 432                 }
 433         }
 434
 435         fclose(fp);
 436
 437         return point;
 438 }
 439
 440 static void mkdir_p(char *dir)
 441 {
 442         char *l = strrchr(dir, '/');
 443
 444         if (l) {
 445                 *l = '\0';
 446                 mkdir_p(dir);
 447                 *l = '/';
 448                 mkdir(dir, 0755);
 449         }
 450 }
 451
 452 static void check_filesystem(struct blkid_struct_probe *pr)
 453 {
 454         pid_t pid;
 455         struct stat statbuf;
 456         char *e2fsck = "/usr/sbin/e2fsck";
 457
 458         if (strncmp(pr->id->name, "ext", 3)) {
 459                 fprintf(stderr, "check_filesystem: %s is not supported\n", pr->id->name);
 460                 return;
 461         }
 462
 463         if (stat(e2fsck, &statbuf) < 0) {
 464                 fprintf(stderr, "check_filesystem: %s not found\n", e2fsck);
 465                 return;
 466         }
 467
 468         pid = fork();
 469         if (!pid) {
 470                 execl(e2fsck, e2fsck, "-p", pr->dev, NULL);
 471                 exit(-1);
 472         } else if (pid > 0) {
 473                 int status;
 474
 475                 waitpid(pid, &status, 0);
 476                 if (WEXITSTATUS(status))
 477                         fprintf(stderr, "check_filesystem: %s returned %d\n", e2fsck, WEXITSTATUS(status));
 478         }
 479 }
 480
 481 static int mount_device(struct blkid_struct_probe *pr, int hotplug)
 482 {
 483         struct mount *m;
 484         char *device = basename(pr->dev);
 485
 486         if (!pr)
 487                 return -1;
 488
 489         if (!strcmp(pr->id->name, "swap")) {
 490                 if (hotplug && !auto_swap)
 491                         return -1;
 492                 m = find_swap(pr->uuid, device);
 493                 if (m || anon_swap)
 494                         swapon(pr->dev, (m) ? (m->prio) : (0));
 495
 496                 return 0;
 497         }
 498
 499         if (hotplug && !auto_mount)
 500                 return -1;
 501
 502         if (find_mount_point(pr->dev)) {
 503                 fprintf(stderr, "%s is already mounted\n", pr->dev);
 504                 return -1;
 505         }
 506
 507         m = find_block(pr->uuid, pr->label, device, NULL);
 508         if (m && m->extroot)
 509                 return -1;
 510
 511         if (m) {
 512                 char *target = m->target;
 513                 char _target[] = "/mnt/mmcblk123";
 514                 int err = 0;
 515
 516                 if (!target) {
 517                         snprintf(_target, sizeof(_target), "/mnt/%s", device);
 518                         target = _target;
 519                 }
 520                 mkdir_p(target);
 521
 522                 if (check_fs)
 523                         check_filesystem(pr);
 524
 525                 err = mount(pr->dev, target, pr->id->name, 0, (m->options) ? (m->options) : (""));
 526                 if (err)
 527                         fprintf(stderr, "mounting %s (%s) as %s failed (%d) - %s\n",
 528                                         pr->dev, pr->id->name, target, err, strerror(err));
 529                 return err;
 530         }
 531
 532         if (anon_mount) {
 533                 char target[] = "/mnt/mmcblk123";
 534                 int err = 0;
 535
 536                 snprintf(target, sizeof(target), "/mnt/%s", device);
 537                 mkdir_p(target);
 538
 539                 if (check_fs)
 540                         check_filesystem(pr);
 541
 542                 err = mount(pr->dev, target, pr->id->name, 0, "");
 543                 if (err)
 544                         fprintf(stderr, "mounting %s (%s) as %s failed (%d) - %s\n",
 545                                         pr->dev, pr->id->name, target, err, strerror(err));
 546                 return err;
 547         }
 548
 549         return 0;
 550 }
 551
 552 static int umount_device(struct blkid_struct_probe *pr)
 553 {
 554         struct mount *m;
 555         char *device = basename(pr->dev);
 556         char *mp;
 557         int err;
 558
 559         if (!pr)
 560                 return -1;
 561
 562         if (!strcmp(pr->id->name, "swap"))
 563                 return -1;
 564
 565         mp = find_mount_point(pr->dev);
 566         if (!mp)
 567                 return -1;
 568
 569         m = find_block(pr->uuid, pr->label, device, NULL);
 570         if (m && m->extroot)
 571                 return -1;
 572
 573         err = umount2(mp, MNT_DETACH);
 574         if (err)
 575                 fprintf(stderr, "unmounting %s (%s)  failed (%d) - %s\n",
 576                         pr->dev, mp, err, strerror(err));
 577         else
 578                 fprintf(stderr, "unmounted %s (%s)\n",
 579                         pr->dev, mp);
 580
 581         return err;
 582 }
 583
 584 static int main_hotplug(int argc, char **argv)
 585 {
 586         char path[32];
 587         char *action, *device, *mount_point;
 588
 589         action = getenv("ACTION");
 590         device = getenv("DEVNAME");
 591
 592         if (!action || !device)
 593                 return -1;
 594         snprintf(path, sizeof(path), "/dev/%s", device);
 595
 596         if (!strcmp(action, "remove")) {
 597                 int err = 0;
 598                 mount_point = find_mount_point(path);
 599                 if (mount_point)
 600                         err = umount2(mount_point, MNT_DETACH);
 601
 602                 if (err)
 603                         fprintf(stderr, "umount of %s failed (%d) - %s\n",
 604                                         mount_point, err, strerror(err));
 605
 606                 return 0;
 607         } else if (strcmp(action, "add")) {
 608                 fprintf(stderr, "Unkown action %s\n", action);
 609
 610                 return -1;
 611         }
 612
 613         if (config_load(NULL))
 614                 return -1;
 615         cache_load(0);
 616
 617         return mount_device(find_block_info(NULL, NULL, path), 1);
 618 }
 619
 620 static int find_block_mtd(char *name, char *part, int plen)
 621 {
 622         FILE *fp = fopen("/proc/mtd", "r");
 623         static char line[256];
 624         char *index = NULL;
 625
 626         if(!fp)
 627                 return -1;
 628
 629         while (!index && fgets(line, sizeof(line), fp)) {
 630                 if (strstr(line, name)) {
 631                         char *eol = strstr(line, ":");
 632
 633                         if (!eol)
 634                                 continue;
 635
 636                         *eol = '\0';
 637                         index = &line[3];
 638                 }
 639         }
 640
 641         fclose(fp);
 642
 643         if (!index)
 644                 return -1;
 645
 646         snprintf(part, plen, "/dev/mtdblock%s", index);
 647
 648         return 0;
 649 }
 650
 651 static int check_extroot(char *path)
 652 {
 653         struct blkid_struct_probe *pr = NULL;
 654         char fs[32];
 655
 656         if (find_block_mtd("rootfs", fs, sizeof(fs)))
 657                 return -1;
 658
 659         list_for_each_entry(pr, &devices, list) {
 660                 if (!strcmp(pr->dev, fs)) {
 661                         struct stat s;
 662                         FILE *fp = NULL;
 663                         char tag[32];
 664                         char uuid[32] = { 0 };
 665
 666                         snprintf(tag, sizeof(tag), "%s/etc/.extroot-uuid", path);
 667                         if (stat(tag, &s)) {
 668                                 fp = fopen(tag, "w+");
 669                                 if (!fp) {
 670                                         fprintf(stderr, "extroot: failed to write uuid tag file\n");
 671                                         /* return 0 to continue boot regardless of error */
 672                                         return 0;
 673                                 }
 674                                 fputs(pr->uuid, fp);
 675                                 fclose(fp);
 676                                 return 0;
 677                         }
 678
 679                         fp = fopen(tag, "r");
 680                         if (!fp) {
 681                                 fprintf(stderr, "extroot: failed to open uuid tag file\n");
 682                                 return -1;
 683                         }
 684
 685                         fgets(uuid, sizeof(uuid), fp);
 686                         fclose(fp);
 687                         if (!strcmp(uuid, pr->uuid))
 688                                 return 0;
 689                         fprintf(stderr, "extroot: uuid tag does not match rom uuid\n");
 690                 }
 691         }
 692         return -1;
 693 }
 694
 695 static int mount_extroot(char *cfg)
 696 {
 697         char overlay[] = "/tmp/overlay";
 698         char mnt[] = "/tmp/mnt";
 699         char *path = mnt;
 700         struct blkid_struct_probe *pr;
 701         struct mount *m;
 702         int err = -1;
 703
 704         if (config_load(cfg))
 705                 return -2;
 706
 707         m = find_block(NULL, NULL, NULL, "/");
 708         if (!m)
 709                 m = find_block(NULL, NULL, NULL, "/overlay");
 710
 711         if (!m || !m->extroot)
 712                 return -1;
 713
 714         pr = find_block_info(m->uuid, m->label, NULL);
 715
 716         if (!pr && delay_root){
 717                 fprintf(stderr, "extroot: is not ready yet, retrying in %ui seconds\n", delay_root);
 718                 sleep(delay_root);
 719                 mkblkdev();
 720                 cache_load(0);
 721                 pr = find_block_info(m->uuid, m->label, NULL);
 722         }
 723         if (pr) {
 724                 if (strncmp(pr->id->name, "ext", 3)) {
 725                         fprintf(stderr, "extroot: %s is not supported, try ext4\n", pr->id->name);
 726                         return -1;
 727                 }
 728                 if (m->overlay)
 729                         path = overlay;
 730                 mkdir_p(path);
 731
 732                 if (check_fs)
 733                         check_filesystem(pr);
 734
 735                 err = mount(pr->dev, path, pr->id->name, 0, (m->options) ? (m->options) : (""));
 736
 737                 if (err) {
 738                         fprintf(stderr, "mounting %s (%s) as %s failed (%d) - %s\n",
 739                                         pr->dev, pr->id->name, path, err, strerror(err));
 740                 } else if (m->overlay) {
 741                         err = check_extroot(path);
 742                         if (err)
 743                                 umount(path);
 744                 }
 745         }
 746
 747         return err;
 748 }
 749
 750 static int main_extroot(int argc, char **argv)
 751 {
 752         struct blkid_struct_probe *pr;
 753         char fs[32] = { 0 };
 754         char fs_data[32] = { 0 };
 755         int err = -1;
 756
 757         if (!getenv("PREINIT"))
 758                 return -1;
 759
 760         if (argc != 2) {
 761                 fprintf(stderr, "Usage: block extroot mountpoint\n");
 762                 return -1;
 763         }
 764
 765         mkblkdev();
 766         cache_load(1);
 767
 768         find_block_mtd("rootfs", fs, sizeof(fs));
 769         if (!fs[0])
 770                 return -2;
 771
 772         pr = find_block_info(NULL, NULL, fs);
 773         if (!pr)
 774                 return -3;
 775
 776         find_block_mtd("rootfs_data", fs_data, sizeof(fs_data));
 777         if (fs_data[0]) {
 778                 pr = find_block_info(NULL, NULL, fs_data);
 779                 if (pr && !strcmp(pr->id->name, "jffs2")) {
 780                         char cfg[] = "/tmp/jffs_cfg";
 781
 782                         mkdir_p(cfg);
 783                         if (!mount(fs_data, cfg, "jffs2", MS_NOATIME, NULL)) {
 784                                 err = mount_extroot(cfg);
 785                                 umount2(cfg, MNT_DETACH);
 786                         }
 787                         if (err < 0)
 788                                 rmdir("/tmp/overlay");
 789                         rmdir(cfg);
 790                         return err;
 791                 }
 792         }
 793
 794         return mount_extroot(NULL);
 795 }
 796
 797 static int main_mount(int argc, char **argv)
 798 {
 799         struct blkid_struct_probe *pr;
 800
 801         if (config_load(NULL))
 802                 return -1;
 803
 804         cache_load(0);
 805         list_for_each_entry(pr, &devices, list)
 806                 mount_device(pr, 0);
 807
 808         return 0;
 809 }
 810
 811 static int main_umount(int argc, char **argv)
 812 {
 813         struct blkid_struct_probe *pr;
 814
 815         if (config_load(NULL))
 816                 return -1;
 817
 818         cache_load(0);
 819         list_for_each_entry(pr, &devices, list)
 820                 umount_device(pr);
 821
 822         return 0;
 823 }
 824
 825 static int main_detect(int argc, char **argv)
 826 {
 827         struct blkid_struct_probe *pr;
 828
 829         cache_load(0);
 830         printf("config 'global'\n");
 831         printf("\toption\tanon_swap\t'0'\n");
 832         printf("\toption\tanon_mount\t'0'\n");
 833         printf("\toption\tauto_swap\t'1'\n");
 834         printf("\toption\tauto_mount\t'1'\n");
 835         printf("\toption\tdelay_root\t'0'\n");
 836         printf("\toption\tcheck_fs\t'0'\n\n");
 837         list_for_each_entry(pr, &devices, list)
 838                 print_block_uci(pr);
 839
 840         return 0;
 841 }
 842
 843 static int main_info(int argc, char **argv)
 844 {
 845         int i;
 846         struct blkid_struct_probe *pr;
 847
 848         cache_load(1);
 849         if (argc == 2) {
 850                 list_for_each_entry(pr, &devices, list)
 851                         print_block_info(pr);
 852
 853                 return 0;
 854         };
 855
 856         for (i = 2; i < argc; i++) {
 857                 struct stat s;
 858
 859                 if (stat(argv[i], &s)) {
 860                         fprintf(stderr, "failed to stat %s\n", argv[i]);
 861                         continue;
 862                 }
 863                 if (!S_ISBLK(s.st_mode)) {
 864                         fprintf(stderr, "%s is not a block device\n", argv[i]);
 865                         continue;
 866                 }
 867                 pr = find_block_info(NULL, NULL, argv[i]);
 868                 if (pr)
 869                         print_block_info(pr);
 870         }
 871
 872         return 0;
 873 }
 874
 875 static int main_swapon(int argc, char **argv)
 876 {
 877         if (argc != 2) {
 878                 fprintf(stderr, "Usage: swapoff [-a] [DEVICE]\n\nStop swapping on DEVICE\n\n\t-a      Stop swapping on all swap devices\n");
 879                 return -1;
 880         }
 881
 882         if (!strcmp(argv[1], "-a")) {
 883                 struct blkid_struct_probe *pr;
 884
 885                 cache_load(0);
 886                 list_for_each_entry(pr, &devices, list) {
 887                         if (strcmp(pr->id->name, "swap"))
 888                                 continue;
 889                         if (swapon(pr->dev, 0))
 890                                 fprintf(stderr, "failed to swapon %s\n", pr->dev);
 891                 }
 892         } else {
 893                 struct stat s;
 894                 int err;
 895
 896                 if (stat(argv[1], &s) || !S_ISBLK(s.st_mode)) {
 897                         fprintf(stderr, "%s is not a block device\n", argv[1]);
 898                         return -1;
 899                 }
 900                 err = swapon(argv[1], 0);
 901                 if (err) {
 902                         fprintf(stderr, "failed to swapon %s (%d)\n", argv[1], err);
 903                         return err;
 904                 }
 905         }
 906
 907         return 0;
 908 }
 909
 910 static int main_swapoff(int argc, char **argv)
 911 {
 912         if (argc != 2) {
 913                 fprintf(stderr, "Usage: swapoff [-a] [DEVICE]\n\nStop swapping on DEVICE\n\n\t-a      Stop swapping on all swap devices\n");
 914                 return -1;
 915         }
 916
 917         if (!strcmp(argv[1], "-a")) {
 918                 FILE *fp = fopen("/proc/swaps", "r");
 919                 char line[256];
 920
 921                 if (!fp) {
 922                         fprintf(stderr, "failed to open /proc/swaps\n");
 923                         return -1;
 924                 }
 925                 fgets(line, sizeof(line), fp);
 926                 while (fgets(line, sizeof(line), fp)) {
 927                         char *end = strchr(line, ' ');
 928                         int err;
 929
 930                         if (!end)
 931                                 continue;
 932                         *end = '\0';
 933                         err = swapoff(line);
 934                         if (err)
 935                                 fprintf(stderr, "failed to swapoff %s (%d)\n", line, err);
 936                 }
 937                 fclose(fp);
 938         } else {
 939                 struct stat s;
 940                 int err;
 941
 942                 if (stat(argv[1], &s) || !S_ISBLK(s.st_mode)) {
 943                         fprintf(stderr, "%s is not a block device\n", argv[1]);
 944                         return -1;
 945                 }
 946                 err = swapoff(argv[1]);
 947                 if (err) {
 948                         fprintf(stderr, "fsiled to swapoff %s (%d)\n", argv[1], err);
 949                         return err;
 950                 }
 951         }
 952
 953         return 0;
 954 }
 955
 956 int main(int argc, char **argv)
 957 {
 958         char *base = basename(*argv);
 959
 960         umask(0);
 961
 962         if (!strcmp(base, "swapon"))
 963                 return main_swapon(argc, argv);
 964
 965         if (!strcmp(base, "swapoff"))
 966                 return main_swapoff(argc, argv);
 967
 968         if ((argc > 1) && !strcmp(base, "block")) {
 969                 if (!strcmp(argv[1], "info"))
 970                         return main_info(argc, argv);
 971
 972                 if (!strcmp(argv[1], "detect"))
 973                         return main_detect(argc, argv);
 974
 975                 if (!strcmp(argv[1], "hotplug"))
 976                         return main_hotplug(argc, argv);
 977
 978                 if (!strcmp(argv[1], "extroot"))
 979                         return main_extroot(argc, argv);
 980
 981                 if (!strcmp(argv[1], "mount"))
 982                         return main_mount(argc, argv);
 983
 984                 if (!strcmp(argv[1], "umount"))
 985                         return main_umount(argc, argv);
 986         }
 987
 988         fprintf(stderr, "Usage: block <info|mount|umount|detect>\n");
 989
 990         return -1;
 991 }