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 #include <dirent.h>
  23 #include <stdarg.h>
  24 #include <string.h>
  25
  26 #include <sys/stat.h>
  27 #include <sys/types.h>
  28 #include <sys/swap.h>
  29 #include <sys/mount.h>
  30 #include <sys/wait.h>
  31
  32 #include <linux/fs.h>
  33
  34 #include <uci.h>
  35 #include <uci_blob.h>
  36
  37 #include <libubox/ulog.h>
  38 #include <libubox/list.h>
  39 #include <libubox/vlist.h>
  40 #include <libubox/blobmsg_json.h>
  41 #include <libubox/avl-cmp.h>
  42
  43 #include "libblkid-tiny/libblkid-tiny.h"
  44
  45 #ifdef UBIFS_EXTROOT
  46 #include "libubi/libubi.h"
  47 #endif
  48
  49 enum {
  50         TYPE_MOUNT,
  51         TYPE_SWAP,
  52 };
  53
  54 struct mount {
  55         struct vlist_node node;
  56         int type;
  57
  58         char *target;
  59         char *path;
  60         char *options;
  61         uint32_t flags;
  62         char *uuid;
  63         char *label;
  64         char *device;
  65         int extroot;
  66         int overlay;
  67         int disabled_fsck;
  68         unsigned int prio;
  69 };
  70
  71 static struct vlist_tree mounts;
  72 static struct blob_buf b;
  73 static LIST_HEAD(devices);
  74 static int anon_mount, anon_swap, auto_mount, auto_swap, check_fs;
  75 static unsigned int delay_root;
  76
  77 enum {
  78         CFG_ANON_MOUNT,
  79         CFG_ANON_SWAP,
  80         CFG_AUTO_MOUNT,
  81         CFG_AUTO_SWAP,
  82         CFG_DELAY_ROOT,
  83         CFG_CHECK_FS,
  84         __CFG_MAX
  85 };
  86
  87 static const struct blobmsg_policy config_policy[__CFG_MAX] = {
  88         [CFG_ANON_SWAP] = { .name = "anon_swap", .type = BLOBMSG_TYPE_INT32 },
  89         [CFG_ANON_MOUNT] = { .name = "anon_mount", .type = BLOBMSG_TYPE_INT32 },
  90         [CFG_AUTO_SWAP] = { .name = "auto_swap", .type = BLOBMSG_TYPE_INT32 },
  91         [CFG_AUTO_MOUNT] = { .name = "auto_mount", .type = BLOBMSG_TYPE_INT32 },
  92         [CFG_DELAY_ROOT] = { .name = "delay_root", .type = BLOBMSG_TYPE_INT32 },
  93         [CFG_CHECK_FS] = { .name = "check_fs", .type = BLOBMSG_TYPE_INT32 },
  94 };
  95
  96 enum {
  97         MOUNT_UUID,
  98         MOUNT_LABEL,
  99         MOUNT_ENABLE,
 100         MOUNT_TARGET,
 101         MOUNT_DEVICE,
 102         MOUNT_OPTIONS,
 103         __MOUNT_MAX
 104 };
 105
 106 static const struct uci_blob_param_list config_attr_list = {
 107         .n_params = __CFG_MAX,
 108         .params = config_policy,
 109 };
 110
 111 static const struct blobmsg_policy mount_policy[__MOUNT_MAX] = {
 112         [MOUNT_UUID] = { .name = "uuid", .type = BLOBMSG_TYPE_STRING },
 113         [MOUNT_LABEL] = { .name = "label", .type = BLOBMSG_TYPE_STRING },
 114         [MOUNT_DEVICE] = { .name = "device", .type = BLOBMSG_TYPE_STRING },
 115         [MOUNT_TARGET] = { .name = "target", .type = BLOBMSG_TYPE_STRING },
 116         [MOUNT_OPTIONS] = { .name = "options", .type = BLOBMSG_TYPE_STRING },
 117         [MOUNT_ENABLE] = { .name = "enabled", .type = BLOBMSG_TYPE_INT32 },
 118 };
 119
 120 static const struct uci_blob_param_list mount_attr_list = {
 121         .n_params = __MOUNT_MAX,
 122         .params = mount_policy,
 123 };
 124
 125 enum {
 126         SWAP_ENABLE,
 127         SWAP_UUID,
 128         SWAP_LABEL,
 129         SWAP_DEVICE,
 130         SWAP_PRIO,
 131         __SWAP_MAX
 132 };
 133
 134 static const struct blobmsg_policy swap_policy[__SWAP_MAX] = {
 135         [SWAP_ENABLE] = { .name = "enabled", .type = BLOBMSG_TYPE_INT32 },
 136         [SWAP_UUID] = { .name = "uuid", .type = BLOBMSG_TYPE_STRING },
 137         [SWAP_LABEL] = { .name = "label", .type = BLOBMSG_TYPE_STRING },
 138         [SWAP_DEVICE] = { .name = "device", .type = BLOBMSG_TYPE_STRING },
 139         [SWAP_PRIO] = { .name = "priority", .type = BLOBMSG_TYPE_INT32 },
 140 };
 141
 142 static const struct uci_blob_param_list swap_attr_list = {
 143         .n_params = __SWAP_MAX,
 144         .params = swap_policy,
 145 };
 146
 147 struct mount_flag {
 148         const char *name;
 149         int32_t flag;
 150 };
 151
 152 static const struct mount_flag mount_flags[] = {
 153         { "sync",               MS_SYNCHRONOUS  },
 154         { "async",              ~MS_SYNCHRONOUS },
 155         { "dirsync",            MS_DIRSYNC      },
 156         { "mand",               MS_MANDLOCK     },
 157         { "nomand",             ~MS_MANDLOCK    },
 158         { "atime",              ~MS_NOATIME     },
 159         { "noatime",            MS_NOATIME      },
 160         { "dev",                ~MS_NODEV       },
 161         { "nodev",              MS_NODEV        },
 162         { "diratime",           ~MS_NODIRATIME  },
 163         { "nodiratime",         MS_NODIRATIME   },
 164         { "exec",               ~MS_NOEXEC      },
 165         { "noexec",             MS_NOEXEC       },
 166         { "suid",               ~MS_NOSUID      },
 167         { "nosuid",             MS_NOSUID       },
 168         { "rw",                 ~MS_RDONLY      },
 169         { "ro",                 MS_RDONLY       },
 170         { "relatime",           MS_RELATIME     },
 171         { "norelatime",         ~MS_RELATIME    },
 172         { "strictatime",        MS_STRICTATIME  },
 173 };
 174
 175 static char *blobmsg_get_strdup(struct blob_attr *attr)
 176 {
 177         if (!attr)
 178                 return NULL;
 179
 180         return strdup(blobmsg_get_string(attr));
 181 }
 182
 183 static char *blobmsg_get_basename(struct blob_attr *attr)
 184 {
 185         if (!attr)
 186                 return NULL;
 187
 188         return strdup(basename(blobmsg_get_string(attr)));
 189 }
 190
 191 static void parse_mount_options(struct mount *m, char *optstr)
 192 {
 193         int i;
 194         bool is_flag;
 195         char *p, *opts, *last;
 196
 197         m->flags = 0;
 198         m->options = NULL;
 199
 200         if (!optstr || !*optstr)
 201                 return;
 202
 203         m->options = opts = calloc(1, strlen(optstr) + 1);
 204
 205         if (!m->options)
 206                 return;
 207
 208         p = last = optstr;
 209
 210         do {
 211                 p = strchr(p, ',');
 212
 213                 if (p)
 214                         *p++ = 0;
 215
 216                 for (i = 0, is_flag = false; i < ARRAY_SIZE(mount_flags); i++) {
 217                         if (!strcmp(last, mount_flags[i].name)) {
 218                                 if (mount_flags[i].flag < 0)
 219                                         m->flags &= (uint32_t)mount_flags[i].flag;
 220                                 else
 221                                         m->flags |= (uint32_t)mount_flags[i].flag;
 222                                 is_flag = true;
 223                                 break;
 224                         }
 225                 }
 226
 227                 if (!is_flag)
 228                         opts += sprintf(opts, "%s%s", (opts > m->options) ? "," : "", last);
 229
 230                 last = p;
 231
 232         } while (p);
 233
 234         free(optstr);
 235 }
 236
 237 static int mount_add(struct uci_section *s)
 238 {
 239         struct blob_attr *tb[__MOUNT_MAX] = { 0 };
 240         struct mount *m;
 241
 242         blob_buf_init(&b, 0);
 243         uci_to_blob(&b, s, &mount_attr_list);
 244         blobmsg_parse(mount_policy, __MOUNT_MAX, tb, blob_data(b.head), blob_len(b.head));
 245
 246         if (!tb[MOUNT_LABEL] && !tb[MOUNT_UUID] && !tb[MOUNT_DEVICE])
 247                 return -1;
 248
 249         if (tb[MOUNT_ENABLE] && !blobmsg_get_u32(tb[MOUNT_ENABLE]))
 250                 return -1;
 251
 252         m = malloc(sizeof(struct mount));
 253         m->type = TYPE_MOUNT;
 254         m->uuid = blobmsg_get_strdup(tb[MOUNT_UUID]);
 255         m->label = blobmsg_get_strdup(tb[MOUNT_LABEL]);
 256         m->target = blobmsg_get_strdup(tb[MOUNT_TARGET]);
 257         m->device = blobmsg_get_basename(tb[MOUNT_DEVICE]);
 258
 259         parse_mount_options(m, blobmsg_get_strdup(tb[MOUNT_OPTIONS]));
 260
 261         m->overlay = m->extroot = 0;
 262         if (m->target && !strcmp(m->target, "/"))
 263                 m->extroot = 1;
 264         if (m->target && !strcmp(m->target, "/overlay"))
 265                 m->extroot = m->overlay = 1;
 266
 267         if (m->target && *m->target != '/') {
 268                 ULOG_WARN("ignoring mount section %s due to invalid target '%s'\n",
 269                           s->e.name, m->target);
 270                 free(m);
 271                 return -1;
 272         }
 273
 274         if (m->uuid)
 275                 vlist_add(&mounts, &m->node, m->uuid);
 276         else if (m->label)
 277                 vlist_add(&mounts, &m->node, m->label);
 278         else if (m->device)
 279                 vlist_add(&mounts, &m->node, m->device);
 280
 281         return 0;
 282 }
 283
 284 static int swap_add(struct uci_section *s)
 285 {
 286         struct blob_attr *tb[__SWAP_MAX] = { 0 };
 287         struct mount *m;
 288
 289         blob_buf_init(&b, 0);
 290         uci_to_blob(&b, s, &swap_attr_list);
 291         blobmsg_parse(swap_policy, __SWAP_MAX, tb, blob_data(b.head), blob_len(b.head));
 292
 293         if (!tb[SWAP_UUID] && !tb[SWAP_LABEL] && !tb[SWAP_DEVICE])
 294                 return -1;
 295
 296         m = malloc(sizeof(struct mount));
 297         memset(m, 0, sizeof(struct mount));
 298         m->type = TYPE_SWAP;
 299         m->uuid = blobmsg_get_strdup(tb[SWAP_UUID]);
 300         m->label = blobmsg_get_strdup(tb[SWAP_LABEL]);
 301         m->device = blobmsg_get_basename(tb[SWAP_DEVICE]);
 302         if (tb[SWAP_PRIO])
 303                 m->prio = blobmsg_get_u32(tb[SWAP_PRIO]);
 304         if (m->prio)
 305                 m->prio = ((m->prio << SWAP_FLAG_PRIO_SHIFT) & SWAP_FLAG_PRIO_MASK) | SWAP_FLAG_PREFER;
 306
 307         if ((!tb[SWAP_ENABLE]) || blobmsg_get_u32(tb[SWAP_ENABLE])) {
 308                 /* store complete swap path */
 309                 if (tb[SWAP_DEVICE])
 310                         m->target = blobmsg_get_strdup(tb[SWAP_DEVICE]);
 311
 312                 if (m->uuid)
 313                         vlist_add(&mounts, &m->node, m->uuid);
 314                 else if (m->label)
 315                         vlist_add(&mounts, &m->node, m->label);
 316                 else if (m->device)
 317                         vlist_add(&mounts, &m->node, m->device);
 318         }
 319
 320         return 0;
 321 }
 322
 323 static int global_add(struct uci_section *s)
 324 {
 325         struct blob_attr *tb[__CFG_MAX] = { 0 };
 326
 327         blob_buf_init(&b, 0);
 328         uci_to_blob(&b, s, &config_attr_list);
 329         blobmsg_parse(config_policy, __CFG_MAX, tb, blob_data(b.head), blob_len(b.head));
 330
 331         if ((tb[CFG_ANON_MOUNT]) && blobmsg_get_u32(tb[CFG_ANON_MOUNT]))
 332                 anon_mount = 1;
 333         if ((tb[CFG_ANON_SWAP]) && blobmsg_get_u32(tb[CFG_ANON_SWAP]))
 334                 anon_swap = 1;
 335
 336         if ((tb[CFG_AUTO_MOUNT]) && blobmsg_get_u32(tb[CFG_AUTO_MOUNT]))
 337                 auto_mount = 1;
 338         if ((tb[CFG_AUTO_SWAP]) && blobmsg_get_u32(tb[CFG_AUTO_SWAP]))
 339                 auto_swap = 1;
 340
 341         if (tb[CFG_DELAY_ROOT])
 342                 delay_root = blobmsg_get_u32(tb[CFG_DELAY_ROOT]);
 343
 344         if ((tb[CFG_CHECK_FS]) && blobmsg_get_u32(tb[CFG_CHECK_FS]))
 345                 check_fs = 1;
 346
 347         return 0;
 348 }
 349
 350 static struct mount* find_swap(const char *uuid, const char *label, const char *device)
 351 {
 352         struct mount *m;
 353
 354         vlist_for_each_element(&mounts, m, node) {
 355                 if (m->type != TYPE_SWAP)
 356                         continue;
 357                 if (uuid && m->uuid && !strcasecmp(m->uuid, uuid))
 358                         return m;
 359                 if (label && m->label && !strcmp(m->label, label))
 360                         return m;
 361                 if (device && m->device && !strcmp(m->device, device))
 362                         return m;
 363         }
 364
 365         return NULL;
 366 }
 367
 368 static struct mount* find_block(const char *uuid, const char *label, const char *device,
 369                                 const char *target)
 370 {
 371         struct mount *m;
 372
 373         vlist_for_each_element(&mounts, m, node) {
 374                 if (m->type != TYPE_MOUNT)
 375                         continue;
 376                 if (m->uuid && uuid && !strcasecmp(m->uuid, uuid))
 377                         return m;
 378                 if (m->label && label && !strcmp(m->label, label))
 379                         return m;
 380                 if (m->target && target && !strcmp(m->target, target))
 381                         return m;
 382                 if (m->device && device && !strcmp(m->device, device))
 383                         return m;
 384         }
 385
 386         return NULL;
 387 }
 388
 389 static void mounts_update(struct vlist_tree *tree, struct vlist_node *node_new,
 390                           struct vlist_node *node_old)
 391 {
 392 }
 393
 394 static struct uci_package * config_try_load(struct uci_context *ctx, char *path)
 395 {
 396         char *file = basename(path);
 397         char *dir = dirname(path);
 398         char *err;
 399         struct uci_package *pkg;
 400
 401         uci_set_confdir(ctx, dir);
 402         ULOG_INFO("attempting to load %s/%s\n", dir, file);
 403
 404         if (uci_load(ctx, file, &pkg)) {
 405                 uci_get_errorstr(ctx, &err, file);
 406                 ULOG_ERR("unable to load configuration (%s)\n", err);
 407
 408                 free(err);
 409                 return NULL;
 410         }
 411
 412         return pkg;
 413 }
 414
 415 static int config_load(char *cfg)
 416 {
 417         struct uci_context *ctx = uci_alloc_context();
 418         struct uci_package *pkg = NULL;
 419         struct uci_element *e;
 420         char path[64];
 421
 422         vlist_init(&mounts, avl_strcmp, mounts_update);
 423
 424         if (cfg) {
 425                 snprintf(path, sizeof(path), "%s/upper/etc/config/fstab", cfg);
 426                 pkg = config_try_load(ctx, path);
 427
 428                 if (!pkg) {
 429                         snprintf(path, sizeof(path), "%s/etc/config/fstab", cfg);
 430                         pkg = config_try_load(ctx, path);
 431                 }
 432         }
 433
 434         if (!pkg) {
 435                 snprintf(path, sizeof(path), "/etc/config/fstab");
 436                 pkg = config_try_load(ctx, path);
 437         }
 438
 439         if (!pkg) {
 440                 ULOG_ERR("no usable configuration\n");
 441                 return -1;
 442         }
 443
 444         vlist_update(&mounts);
 445         uci_foreach_element(&pkg->sections, e) {
 446                 struct uci_section *s = uci_to_section(e);
 447
 448                 if (!strcmp(s->type, "mount"))
 449                         mount_add(s);
 450                 if (!strcmp(s->type, "swap"))
 451                         swap_add(s);
 452                 if (!strcmp(s->type, "global"))
 453                         global_add(s);
 454         }
 455         vlist_flush(&mounts);
 456
 457         return 0;
 458 }
 459
 460 static struct blkid_struct_probe* _probe_path(char *path)
 461 {
 462         struct blkid_struct_probe *pr;
 463
 464         pr = malloc(sizeof(*pr));
 465
 466         if (!pr)
 467                 return NULL;
 468
 469         memset(pr, 0, sizeof(*pr));
 470         probe_block(path, pr);
 471
 472         if (pr->err || !pr->id) {
 473                 free(pr);
 474                 return NULL;
 475         }
 476
 477         return pr;
 478 }
 479
 480 static int _cache_load(const char *path)
 481 {
 482         int gl_flags = GLOB_NOESCAPE | GLOB_MARK;
 483         int j;
 484         glob_t gl;
 485
 486         if (glob(path, gl_flags, NULL, &gl) < 0)
 487                 return -1;
 488
 489         for (j = 0; j < gl.gl_pathc; j++) {
 490                 struct blkid_struct_probe *pr = _probe_path(gl.gl_pathv[j]);
 491                 if (pr)
 492                         list_add_tail(&pr->list, &devices);
 493         }
 494
 495         globfree(&gl);
 496
 497         return 0;
 498 }
 499
 500 static void cache_load(int mtd)
 501 {
 502         if (mtd) {
 503                 _cache_load("/dev/mtdblock*");
 504                 _cache_load("/dev/ubiblock*");
 505                 _cache_load("/dev/ubi?*_?*");
 506         }
 507         _cache_load("/dev/mmcblk*");
 508         _cache_load("/dev/sd*");
 509         _cache_load("/dev/hd*");
 510         _cache_load("/dev/md*");
 511         _cache_load("/dev/vd*");
 512         _cache_load("/dev/mapper/*");
 513 }
 514
 515 static int print_block_info(struct blkid_struct_probe *pr)
 516 {
 517         printf("%s:", pr->dev);
 518         if (pr->uuid[0])
 519                 printf(" UUID=\"%s\"", pr->uuid);
 520
 521         if (pr->label[0])
 522                 printf(" LABEL=\"%s\"", pr->label);
 523
 524         if (pr->name[0])
 525                 printf(" NAME=\"%s\"", pr->name);
 526
 527         if (pr->version[0])
 528                 printf(" VERSION=\"%s\"", pr->version);
 529
 530         printf(" TYPE=\"%s\"\n", pr->id->name);
 531
 532         return 0;
 533 }
 534
 535 static int print_block_uci(struct blkid_struct_probe *pr)
 536 {
 537         if (!strcmp(pr->id->name, "swap")) {
 538                 printf("config 'swap'\n");
 539         } else {
 540                 printf("config 'mount'\n");
 541                 printf("\toption\ttarget\t'/mnt/%s'\n", basename(pr->dev));
 542         }
 543         if (pr->uuid[0])
 544                 printf("\toption\tuuid\t'%s'\n", pr->uuid);
 545         else
 546                 printf("\toption\tdevice\t'%s'\n", pr->dev);
 547         printf("\toption\tenabled\t'0'\n\n");
 548
 549         return 0;
 550 }
 551
 552 static struct blkid_struct_probe* find_block_info(char *uuid, char *label, char *path)
 553 {
 554         struct blkid_struct_probe *pr = NULL;
 555
 556         if (uuid)
 557                 list_for_each_entry(pr, &devices, list)
 558                         if (!strcasecmp(pr->uuid, uuid))
 559                                 return pr;
 560
 561         if (label)
 562                 list_for_each_entry(pr, &devices, list)
 563                         if (!strcmp(pr->label, label))
 564                                 return pr;
 565
 566         if (path)
 567                 list_for_each_entry(pr, &devices, list)
 568                         if (!strcmp(basename(pr->dev), basename(path)))
 569                                 return pr;
 570
 571         return NULL;
 572 }
 573
 574 static char* find_mount_point(char *block)
 575 {
 576         FILE *fp = fopen("/proc/mounts", "r");
 577         static char line[256];
 578         int len = strlen(block);
 579         char *point = NULL;
 580
 581         if(!fp)
 582                 return NULL;
 583
 584         while (fgets(line, sizeof(line), fp)) {
 585                 if (!strncmp(line, block, len)) {
 586                         char *p = &line[len + 1];
 587                         char *t = strstr(p, " ");
 588
 589                         if (!t) {
 590                                 fclose(fp);
 591                                 return NULL;
 592                         }
 593                         *t = '\0';
 594                         point = p;
 595                         break;
 596                 }
 597         }
 598
 599         fclose(fp);
 600
 601         return point;
 602 }
 603
 604 static void mkdir_p(char *dir)
 605 {
 606         char *l = strrchr(dir, '/');
 607
 608         if (l) {
 609                 *l = '\0';
 610                 mkdir_p(dir);
 611                 *l = '/';
 612                 mkdir(dir, 0755);
 613         }
 614 }
 615
 616 static void check_filesystem(struct blkid_struct_probe *pr)
 617 {
 618         pid_t pid;
 619         struct stat statbuf;
 620         const char *e2fsck = "/usr/sbin/e2fsck";
 621         const char *dosfsck = "/usr/sbin/dosfsck";
 622         const char *ckfs;
 623
 624         /* UBIFS does not need stuff like fsck */
 625         if (!strncmp(pr->id->name, "ubifs", 5))
 626                 return;
 627
 628         if (!strncmp(pr->id->name, "vfat", 4)) {
 629                 ckfs = dosfsck;
 630         } else if (!strncmp(pr->id->name, "ext", 3)) {
 631                 ckfs = e2fsck;
 632         } else {
 633                 ULOG_ERR("check_filesystem: %s is not supported\n", pr->id->name);
 634                 return;
 635         }
 636
 637         if (stat(ckfs, &statbuf) < 0) {
 638                 ULOG_ERR("check_filesystem: %s not found\n", ckfs);
 639                 return;
 640         }
 641
 642         pid = fork();
 643         if (!pid) {
 644                 execl(ckfs, ckfs, "-p", pr->dev, NULL);
 645                 exit(-1);
 646         } else if (pid > 0) {
 647                 int status;
 648
 649                 waitpid(pid, &status, 0);
 650                 if (WEXITSTATUS(status))
 651                         ULOG_ERR("check_filesystem: %s returned %d\n", ckfs, WEXITSTATUS(status));
 652         }
 653 }
 654
 655 static void handle_swapfiles(bool on)
 656 {
 657         struct stat s;
 658         struct mount *m;
 659         struct blkid_struct_probe *pr;
 660
 661         vlist_for_each_element(&mounts, m, node)
 662         {
 663                 if (m->type != TYPE_SWAP || !m->target)
 664                         continue;
 665
 666                 if (stat(m->target, &s) || !S_ISREG(s.st_mode))
 667                         continue;
 668
 669                 pr = _probe_path(m->target);
 670
 671                 if (!pr)
 672                         continue;
 673
 674                 if (!strcmp(pr->id->name, "swap")) {
 675                         if (on)
 676                                 swapon(pr->dev, m->prio);
 677                         else
 678                                 swapoff(pr->dev);
 679                 }
 680
 681                 free(pr);
 682         }
 683 }
 684
 685 static int mount_device(struct blkid_struct_probe *pr, int hotplug)
 686 {
 687         struct mount *m;
 688         char *device;
 689
 690         if (!pr)
 691                 return -1;
 692
 693         device = basename(pr->dev);
 694
 695         if (!strcmp(pr->id->name, "swap")) {
 696                 if (hotplug && !auto_swap)
 697                         return -1;
 698                 m = find_swap(pr->uuid, pr->label, device);
 699                 if (m || anon_swap)
 700                         swapon(pr->dev, (m) ? (m->prio) : (0));
 701
 702                 return 0;
 703         }
 704
 705         if (hotplug && !auto_mount)
 706                 return -1;
 707
 708         if (find_mount_point(pr->dev)) {
 709                 ULOG_ERR("%s is already mounted\n", pr->dev);
 710                 return -1;
 711         }
 712
 713         m = find_block(pr->uuid, pr->label, device, NULL);
 714         if (m && m->extroot)
 715                 return -1;
 716
 717         if (m) {
 718                 char *target = m->target;
 719                 char _target[32];
 720                 int err = 0;
 721
 722                 if (!target) {
 723                         snprintf(_target, sizeof(_target), "/mnt/%s", device);
 724                         target = _target;
 725                 }
 726                 mkdir_p(target);
 727
 728                 if (check_fs)
 729                         check_filesystem(pr);
 730
 731                 err = mount(pr->dev, target, pr->id->name, m->flags,
 732                             (m->options) ? (m->options) : (""));
 733                 if (err)
 734                         ULOG_ERR("mounting %s (%s) as %s failed (%d) - %s\n",
 735                                  pr->dev, pr->id->name, target, err, strerror(err));
 736                 else
 737                         handle_swapfiles(true);
 738                 return err;
 739         }
 740
 741         if (anon_mount) {
 742                 char target[] = "/mnt/mmcblk123";
 743                 int err = 0;
 744
 745                 snprintf(target, sizeof(target), "/mnt/%s", device);
 746                 mkdir_p(target);
 747
 748                 if (check_fs)
 749                         check_filesystem(pr);
 750
 751                 err = mount(pr->dev, target, pr->id->name, 0, "");
 752                 if (err)
 753                         ULOG_ERR("mounting %s (%s) as %s failed (%d) - %s\n",
 754                                  pr->dev, pr->id->name, target, err, strerror(err));
 755                 else
 756                         handle_swapfiles(true);
 757                 return err;
 758         }
 759
 760         return 0;
 761 }
 762
 763 static int umount_device(struct blkid_struct_probe *pr)
 764 {
 765         struct mount *m;
 766         char *device = basename(pr->dev);
 767         char *mp;
 768         int err;
 769
 770         if (!pr)
 771                 return -1;
 772
 773         if (!strcmp(pr->id->name, "swap"))
 774                 return -1;
 775
 776         mp = find_mount_point(pr->dev);
 777         if (!mp)
 778                 return -1;
 779
 780         m = find_block(pr->uuid, pr->label, device, NULL);
 781         if (m && m->extroot)
 782                 return -1;
 783
 784         err = umount2(mp, MNT_DETACH);
 785         if (err)
 786                 ULOG_ERR("unmounting %s (%s)  failed (%d) - %s\n",
 787                          pr->dev, mp, err, strerror(err));
 788         else
 789                 ULOG_INFO("unmounted %s (%s)\n",
 790                           pr->dev, mp);
 791
 792         return err;
 793 }
 794
 795 static int main_hotplug(int argc, char **argv)
 796 {
 797         char path[32];
 798         char *action, *device, *mount_point;
 799
 800         action = getenv("ACTION");
 801         device = getenv("DEVNAME");
 802
 803         if (!action || !device)
 804                 return -1;
 805         snprintf(path, sizeof(path), "/dev/%s", device);
 806
 807         if (!strcmp(action, "remove")) {
 808                 int err = 0;
 809                 mount_point = find_mount_point(path);
 810                 if (mount_point)
 811                         err = umount2(mount_point, MNT_DETACH);
 812
 813                 if (err)
 814                         ULOG_ERR("umount of %s failed (%d) - %s\n",
 815                                  mount_point, err, strerror(err));
 816
 817                 return 0;
 818         } else if (strcmp(action, "add")) {
 819                 ULOG_ERR("Unkown action %s\n", action);
 820
 821                 return -1;
 822         }
 823
 824         if (config_load(NULL))
 825                 return -1;
 826         cache_load(0);
 827
 828         return mount_device(find_block_info(NULL, NULL, path), 1);
 829 }
 830
 831 static int find_block_mtd(char *name, char *part, int plen)
 832 {
 833         FILE *fp = fopen("/proc/mtd", "r");
 834         static char line[256];
 835         char *index = NULL;
 836
 837         if(!fp)
 838                 return -1;
 839
 840         while (!index && fgets(line, sizeof(line), fp)) {
 841                 if (strstr(line, name)) {
 842                         char *eol = strstr(line, ":");
 843
 844                         if (!eol)
 845                                 continue;
 846
 847                         *eol = '\0';
 848                         index = &line[3];
 849                 }
 850         }
 851
 852         fclose(fp);
 853
 854         if (!index)
 855                 return -1;
 856
 857         snprintf(part, plen, "/dev/mtdblock%s", index);
 858
 859         return 0;
 860 }
 861
 862 #ifdef UBIFS_EXTROOT
 863 static int find_ubi_vol(libubi_t libubi, char *name, int *dev_num, int *vol_id)
 864 {
 865         int dev = 0;
 866
 867         while (ubi_dev_present(libubi, dev))
 868         {
 869                 struct ubi_dev_info dev_info;
 870                 struct ubi_vol_info vol_info;
 871
 872                 if (ubi_get_dev_info1(libubi, dev++, &dev_info))
 873                         continue;
 874                 if (ubi_get_vol_info1_nm(libubi, dev_info.dev_num, name, &vol_info))
 875                         continue;
 876
 877                 *dev_num = dev_info.dev_num;
 878                 *vol_id = vol_info.vol_id;
 879
 880                 return 0;
 881         }
 882
 883         return -1;
 884 }
 885
 886 static int find_block_ubi(libubi_t libubi, char *name, char *part, int plen)
 887 {
 888         int dev_num;
 889         int vol_id;
 890         int err = -1;
 891
 892         err = find_ubi_vol(libubi, name, &dev_num, &vol_id);
 893         if (!err)
 894                 snprintf(part, plen, "/dev/ubi%d_%d", dev_num, vol_id);
 895
 896         return err;
 897 }
 898
 899 static int find_block_ubi_RO(libubi_t libubi, char *name, char *part, int plen)
 900 {
 901         int dev_num;
 902         int vol_id;
 903         int err = -1;
 904
 905         err = find_ubi_vol(libubi, name, &dev_num, &vol_id);
 906         if (!err)
 907                 snprintf(part, plen, "/dev/ubiblock%d_%d", dev_num, vol_id);
 908
 909         return err;
 910 }
 911
 912 #else
 913
 914 static int find_root_dev(char *buf, int len)
 915 {
 916         DIR *d;
 917         dev_t root;
 918         struct stat s;
 919         struct dirent *e;
 920
 921         if (stat("/", &s))
 922                 return -1;
 923
 924         if (!(d = opendir("/dev")))
 925                 return -1;
 926
 927         root = s.st_dev;
 928
 929         while ((e = readdir(d)) != NULL) {
 930                 snprintf(buf, len, "/dev/%s", e->d_name);
 931
 932                 if (stat(buf, &s) || s.st_rdev != root)
 933                         continue;
 934
 935                 closedir(d);
 936                 return 0;
 937         }
 938
 939         closedir(d);
 940         return -1;
 941 }
 942
 943 #endif
 944
 945 static int test_fs_support(const char *name)
 946 {
 947         char line[128], *p;
 948         int rv = -1;
 949         FILE *f;
 950
 951         if ((f = fopen("/proc/filesystems", "r")) != NULL) {
 952                 while (fgets(line, sizeof(line), f)) {
 953                         p = strtok(line, "\t\n");
 954
 955                         if (p && !strcmp(p, "nodev"))
 956                                 p = strtok(NULL, "\t\n");
 957
 958                         if (p && !strcmp(p, name)) {
 959                                 rv = 0;
 960                                 break;
 961                         }
 962                 }
 963                 fclose(f);
 964         }
 965
 966         return rv;
 967 }
 968
 969 static int check_extroot(char *path)
 970 {
 971         struct blkid_struct_probe *pr = NULL;
 972         char devpath[32];
 973
 974 #ifdef UBIFS_EXTROOT
 975         if (find_block_mtd("\"rootfs\"", devpath, sizeof(devpath))) {
 976                 int err = -1;
 977                 libubi_t libubi;
 978
 979                 libubi = libubi_open();
 980                 err = find_block_ubi_RO(libubi, "rootfs", devpath, sizeof(devpath));
 981                 libubi_close(libubi);
 982                 if (err)
 983                         return -1;
 984         }
 985 #else
 986         if (find_block_mtd("\"rootfs\"", devpath, sizeof(devpath))) {
 987                 if (find_root_dev(devpath, sizeof(devpath))) {
 988                         ULOG_ERR("extroot: unable to determine root device\n");
 989                         return -1;
 990                 }
 991         }
 992 #endif
 993
 994         list_for_each_entry(pr, &devices, list) {
 995                 if (!strcmp(pr->dev, devpath)) {
 996                         struct stat s;
 997                         FILE *fp = NULL;
 998                         char tag[64];
 999                         char uuid[64] = { 0 };
1000
1001                         snprintf(tag, sizeof(tag), "%s/etc", path);
1002                         if (stat(tag, &s))
1003                                 mkdir_p(tag);
1004
1005                         snprintf(tag, sizeof(tag), "%s/etc/.extroot-uuid", path);
1006                         if (stat(tag, &s)) {
1007                                 fp = fopen(tag, "w+");
1008                                 if (!fp) {
1009                                         ULOG_ERR("extroot: failed to write UUID to %s: %d (%s)\n",
1010                                                  tag, errno, strerror(errno));
1011                                         /* return 0 to continue boot regardless of error */
1012                                         return 0;
1013                                 }
1014                                 fputs(pr->uuid, fp);
1015                                 fclose(fp);
1016                                 return 0;
1017                         }
1018
1019                         fp = fopen(tag, "r");
1020                         if (!fp) {
1021                                 ULOG_ERR("extroot: failed to read UUID from %s: %d (%s)\n",
1022                                          tag, errno, strerror(errno));
1023                                 return -1;
1024                         }
1025
1026                         if (!fgets(uuid, sizeof(uuid), fp))
1027                                 ULOG_ERR("extroot: failed to read UUID from %s: %d (%s)\n",
1028                                          tag, errno, strerror(errno));
1029                         fclose(fp);
1030
1031                         if (*uuid || !strcasecmp(uuid, pr->uuid))
1032                                 return 0;
1033
1034                         ULOG_ERR("extroot: UUID mismatch (root: %s, %s: %s)\n",
1035                                  pr->uuid, basename(path), uuid);
1036                         return -1;
1037                 }
1038         }
1039
1040         ULOG_ERR("extroot: unable to lookup root device %s\n", devpath);
1041         return -1;
1042 }
1043
1044 /*
1045  * Read info about extroot from UCI (using prefix) and mount it.
1046  */
1047 static int mount_extroot(char *cfg)
1048 {
1049         char overlay[] = "/tmp/extroot/overlay";
1050         char mnt[] = "/tmp/extroot/mnt";
1051         char *path = mnt;
1052         struct blkid_struct_probe *pr;
1053         struct mount *m;
1054         int err = -1;
1055
1056         /* Load @cfg/etc/config/fstab */
1057         if (config_load(cfg))
1058                 return -2;
1059
1060         /* See if there is extroot-specific mount config */
1061         m = find_block(NULL, NULL, NULL, "/");
1062         if (!m)
1063                 m = find_block(NULL, NULL, NULL, "/overlay");
1064
1065         if (!m || !m->extroot)
1066         {
1067                 ULOG_INFO("extroot: not configured\n");
1068                 return -1;
1069         }
1070
1071         /* Find block device pointed by the mount config */
1072         pr = find_block_info(m->uuid, m->label, m->device);
1073
1074         if (!pr && delay_root){
1075                 ULOG_INFO("extroot: device not present, retrying in %u seconds\n", delay_root);
1076                 sleep(delay_root);
1077                 mkblkdev();
1078                 cache_load(0);
1079                 pr = find_block_info(m->uuid, m->label, m->device);
1080         }
1081         if (pr) {
1082                 if (strncmp(pr->id->name, "ext", 3) &&
1083                     strncmp(pr->id->name, "ubifs", 5)) {
1084                         ULOG_ERR("extroot: unsupported filesystem %s, try ext4\n", pr->id->name);
1085                         return -1;
1086                 }
1087
1088                 if (test_fs_support(pr->id->name)) {
1089                         ULOG_ERR("extroot: filesystem %s not supported by kernel\n", pr->id->name);
1090                         return -1;
1091                 }
1092
1093                 if (m->overlay)
1094                         path = overlay;
1095                 mkdir_p(path);
1096
1097                 if (check_fs)
1098                         check_filesystem(pr);
1099
1100                 err = mount(pr->dev, path, pr->id->name, m->flags,
1101                             (m->options) ? (m->options) : (""));
1102
1103                 if (err) {
1104                         ULOG_ERR("extroot: mounting %s (%s) on %s failed: %d (%s)\n",
1105                                  pr->dev, pr->id->name, path, err, strerror(err));
1106                 } else if (m->overlay) {
1107                         err = check_extroot(path);
1108                         if (err)
1109                                 umount(path);
1110                 }
1111         } else {
1112                 ULOG_ERR("extroot: cannot find device %s%s\n",
1113                          (m->uuid ? "with UUID " : (m->label ? "with label " : "")),
1114                          (m->uuid ? m->uuid : (m->label ? m->label : m->device)));
1115         }
1116
1117         return err;
1118 }
1119
1120 static int main_extroot(int argc, char **argv)
1121 {
1122         struct blkid_struct_probe *pr;
1123         char blkdev_path[32] = { 0 };
1124         int err = -1;
1125 #ifdef UBIFS_EXTROOT
1126         libubi_t libubi;
1127 #endif
1128
1129         if (!getenv("PREINIT"))
1130                 return -1;
1131
1132         if (argc != 2) {
1133                 ULOG_ERR("Usage: block extroot\n");
1134                 return -1;
1135         }
1136
1137         mkblkdev();
1138         cache_load(1);
1139
1140         /* enable LOG_INFO messages */
1141         ulog_threshold(LOG_INFO);
1142
1143         /*
1144          * Look for "rootfs_data". We will want to mount it and check for
1145          * extroot configuration.
1146          */
1147
1148         /* Start with looking for MTD partition */
1149         find_block_mtd("\"rootfs_data\"", blkdev_path, sizeof(blkdev_path));
1150         if (blkdev_path[0]) {
1151                 pr = find_block_info(NULL, NULL, blkdev_path);
1152                 if (pr && !strcmp(pr->id->name, "jffs2")) {
1153                         char cfg[] = "/tmp/jffs_cfg";
1154
1155                         /*
1156                          * Mount MTD part and try extroot (using
1157                          * /etc/config/fstab from that partition)
1158                          */
1159                         mkdir_p(cfg);
1160                         if (!mount(blkdev_path, cfg, "jffs2", MS_NOATIME, NULL)) {
1161                                 err = mount_extroot(cfg);
1162                                 umount2(cfg, MNT_DETACH);
1163                         }
1164                         if (err < 0)
1165                                 rmdir("/tmp/overlay");
1166                         rmdir(cfg);
1167                         return err;
1168                 }
1169         }
1170
1171 #ifdef UBIFS_EXTROOT
1172         /* ... but it also could be an UBI volume */
1173         memset(blkdev_path, 0, sizeof(blkdev_path));
1174         libubi = libubi_open();
1175         find_block_ubi(libubi, "rootfs_data", blkdev_path, sizeof(blkdev_path));
1176         libubi_close(libubi);
1177         if (blkdev_path[0]) {
1178                 char cfg[] = "/tmp/ubifs_cfg";
1179
1180                 /* Mount volume and try extroot (using fstab from that vol) */
1181                 mkdir_p(cfg);
1182                 if (!mount(blkdev_path, cfg, "ubifs", MS_NOATIME, NULL)) {
1183                         err = mount_extroot(cfg);
1184                         umount2(cfg, MNT_DETACH);
1185                 }
1186                 if (err < 0)
1187                         rmdir("/tmp/overlay");
1188                 rmdir(cfg);
1189                 return err;
1190        }
1191 #endif
1192
1193         return mount_extroot(NULL);
1194 }
1195
1196 static int main_mount(int argc, char **argv)
1197 {
1198         struct blkid_struct_probe *pr;
1199
1200         if (config_load(NULL))
1201                 return -1;
1202
1203         cache_load(1);
1204         list_for_each_entry(pr, &devices, list)
1205                 mount_device(pr, 0);
1206
1207         handle_swapfiles(true);
1208
1209         return 0;
1210 }
1211
1212 static int main_umount(int argc, char **argv)
1213 {
1214         struct blkid_struct_probe *pr;
1215
1216         if (config_load(NULL))
1217                 return -1;
1218
1219         handle_swapfiles(false);
1220
1221         cache_load(0);
1222         list_for_each_entry(pr, &devices, list)
1223                 umount_device(pr);
1224
1225         return 0;
1226 }
1227
1228 static int main_detect(int argc, char **argv)
1229 {
1230         struct blkid_struct_probe *pr;
1231
1232         cache_load(0);
1233         printf("config 'global'\n");
1234         printf("\toption\tanon_swap\t'0'\n");
1235         printf("\toption\tanon_mount\t'0'\n");
1236         printf("\toption\tauto_swap\t'1'\n");
1237         printf("\toption\tauto_mount\t'1'\n");
1238         printf("\toption\tdelay_root\t'5'\n");
1239         printf("\toption\tcheck_fs\t'0'\n\n");
1240         list_for_each_entry(pr, &devices, list)
1241                 print_block_uci(pr);
1242
1243         return 0;
1244 }
1245
1246 static int main_info(int argc, char **argv)
1247 {
1248         int i;
1249         struct blkid_struct_probe *pr;
1250
1251         cache_load(1);
1252         if (argc == 2) {
1253                 list_for_each_entry(pr, &devices, list)
1254                         print_block_info(pr);
1255
1256                 return 0;
1257         };
1258
1259         for (i = 2; i < argc; i++) {
1260                 struct stat s;
1261
1262                 if (stat(argv[i], &s)) {
1263                         ULOG_ERR("failed to stat %s\n", argv[i]);
1264                         continue;
1265                 }
1266                 if (!S_ISBLK(s.st_mode)) {
1267                         ULOG_ERR("%s is not a block device\n", argv[i]);
1268                         continue;
1269                 }
1270                 pr = find_block_info(NULL, NULL, argv[i]);
1271                 if (pr)
1272                         print_block_info(pr);
1273         }
1274
1275         return 0;
1276 }
1277
1278 static int swapon_usage(void)
1279 {
1280         fprintf(stderr, "Usage: swapon [-s] [-a] [[-p pri] DEVICE]\n\n"
1281                 "\tStart swapping on [DEVICE]\n"
1282                 " -a\tStart swapping on all swap devices\n"
1283                 " -p pri\tSet priority of swap device\n"
1284                 " -s\tShow summary\n");
1285         return -1;
1286 }
1287
1288 static int main_swapon(int argc, char **argv)
1289 {
1290         int ch;
1291         FILE *fp;
1292         char *lineptr;
1293         size_t s;
1294         struct blkid_struct_probe *pr;
1295         int flags = 0;
1296         int pri;
1297         struct stat st;
1298         int err;
1299
1300         while ((ch = getopt(argc, argv, "ap:s")) != -1) {
1301                 switch(ch) {
1302                 case 's':
1303                         fp = fopen("/proc/swaps", "r");
1304                         lineptr = NULL;
1305
1306                         if (!fp) {
1307                                 ULOG_ERR("failed to open /proc/swaps\n");
1308                                 return -1;
1309                         }
1310                         while (getline(&lineptr, &s, fp) > 0)
1311                                 printf("%s", lineptr);
1312                         if (lineptr)
1313                                 free(lineptr);
1314                         fclose(fp);
1315                         return 0;
1316                 case 'a':
1317                         cache_load(0);
1318                         list_for_each_entry(pr, &devices, list) {
1319                                 if (strcmp(pr->id->name, "swap"))
1320                                         continue;
1321                                 if (swapon(pr->dev, 0))
1322                                         ULOG_ERR("failed to swapon %s\n", pr->dev);
1323                         }
1324                         return 0;
1325                 case 'p':
1326                         pri = atoi(optarg);
1327                         if (pri >= 0)
1328                                 flags = ((pri << SWAP_FLAG_PRIO_SHIFT) & SWAP_FLAG_PRIO_MASK) | SWAP_FLAG_PREFER;
1329                         break;
1330                 default:
1331                         return swapon_usage();
1332                 }
1333
1334         }
1335
1336         if (optind != (argc - 1))
1337                 return swapon_usage();
1338
1339         if (stat(argv[optind], &st) || (!S_ISBLK(st.st_mode) && !S_ISREG(st.st_mode))) {
1340                 ULOG_ERR("%s is not a block device or file\n", argv[optind]);
1341                 return -1;
1342         }
1343         err = swapon(argv[optind], flags);
1344         if (err) {
1345                 ULOG_ERR("failed to swapon %s (%d)\n", argv[optind], err);
1346                 return err;
1347         }
1348
1349         return 0;
1350 }
1351
1352 static int main_swapoff(int argc, char **argv)
1353 {
1354         if (argc != 2) {
1355                 ULOG_ERR("Usage: swapoff [-a] [DEVICE]\n\n"
1356                         "\tStop swapping on DEVICE\n"
1357                         " -a\tStop swapping on all swap devices\n");
1358                 return -1;
1359         }
1360
1361         if (!strcmp(argv[1], "-a")) {
1362                 FILE *fp = fopen("/proc/swaps", "r");
1363                 char line[256];
1364
1365                 if (!fp) {
1366                         ULOG_ERR("failed to open /proc/swaps\n");
1367                         return -1;
1368                 }
1369                 if (fgets(line, sizeof(line), fp))
1370                         while (fgets(line, sizeof(line), fp)) {
1371                                 char *end = strchr(line, ' ');
1372                                 int err;
1373
1374                                 if (!end)
1375                                         continue;
1376                                 *end = '\0';
1377                                 err = swapoff(line);
1378                                 if (err)
1379                                         ULOG_ERR("failed to swapoff %s (%d)\n", line, err);
1380                         }
1381                 fclose(fp);
1382         } else {
1383                 struct stat s;
1384                 int err;
1385
1386                 if (stat(argv[1], &s) || (!S_ISBLK(s.st_mode) && !S_ISREG(s.st_mode))) {
1387                         ULOG_ERR("%s is not a block device or file\n", argv[1]);
1388                         return -1;
1389                 }
1390                 err = swapoff(argv[1]);
1391                 if (err) {
1392                         ULOG_ERR("failed to swapoff %s (%d)\n", argv[1], err);
1393                         return err;
1394                 }
1395         }
1396
1397         return 0;
1398 }
1399
1400 int main(int argc, char **argv)
1401 {
1402         char *base = basename(*argv);
1403
1404         umask(0);
1405
1406         ulog_open(-1, -1, "block");
1407         ulog_threshold(LOG_NOTICE);
1408
1409         if (!strcmp(base, "swapon"))
1410                 return main_swapon(argc, argv);
1411
1412         if (!strcmp(base, "swapoff"))
1413                 return main_swapoff(argc, argv);
1414
1415         if ((argc > 1) && !strcmp(base, "block")) {
1416                 if (!strcmp(argv[1], "info"))
1417                         return main_info(argc, argv);
1418
1419                 if (!strcmp(argv[1], "detect"))
1420                         return main_detect(argc, argv);
1421
1422                 if (!strcmp(argv[1], "hotplug"))
1423                         return main_hotplug(argc, argv);
1424
1425                 if (!strcmp(argv[1], "extroot"))
1426                         return main_extroot(argc, argv);
1427
1428                 if (!strcmp(argv[1], "mount"))
1429                         return main_mount(argc, argv);
1430
1431                 if (!strcmp(argv[1], "umount"))
1432                         return main_umount(argc, argv);
1433
1434                 if (!strcmp(argv[1], "remount")) {
1435                         int ret = main_umount(argc, argv);
1436
1437                         if (!ret)
1438                                 ret = main_mount(argc, argv);
1439                         return ret;
1440                 }
1441         }
1442
1443         ULOG_ERR("Usage: block <info|mount|umount|detect>\n");
1444
1445         return -1;
1446 }