block.c

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