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 #include <errno.h>
  26 #include <fcntl.h>
  27 #include <limits.h>
  28
  29 #include <sys/stat.h>
  30 #include <sys/types.h>
  31 #include <sys/swap.h>
  32 #include <sys/mount.h>
  33 #include <sys/wait.h>
  34 #include <sys/sysmacros.h>
  35
  36 #include <linux/fs.h>
  37
  38 #include <uci.h>
  39 #include <uci_blob.h>
  40
  41 #include <libubox/ulog.h>
  42 #include <libubox/list.h>
  43 #include <libubox/vlist.h>
  44 #include <libubox/blobmsg_json.h>
  45 #include <libubox/avl-cmp.h>
  46 #include <libubus.h>
  47
  48 #include "probe.h"
  49
  50 #define AUTOFS_MOUNT_PATH       "/tmp/run/blockd/"
  51
  52 #ifdef UBIFS_EXTROOT
  53 #include "libubi/libubi.h"
  54 #endif
  55
  56 enum {
  57         TYPE_MOUNT,
  58         TYPE_SWAP,
  59 };
  60
  61 enum {
  62         TYPE_DEV,
  63         TYPE_HOTPLUG,
  64         TYPE_AUTOFS,
  65 };
  66
  67 struct mount {
  68         struct vlist_node node;
  69         int type;
  70
  71         char *target;
  72         char *path;
  73         char *options;
  74         uint32_t flags;
  75         char *uuid;
  76         char *label;
  77         char *device;
  78         int extroot;
  79         int autofs;
  80         int overlay;
  81         int disabled_fsck;
  82         unsigned int prio;
  83 };
  84
  85 static struct vlist_tree mounts;
  86 static struct blob_buf b;
  87 static LIST_HEAD(devices);
  88 static int anon_mount, anon_swap, auto_mount, auto_swap, check_fs;
  89 static unsigned int delay_root;
  90
  91 enum {
  92         CFG_ANON_MOUNT,
  93         CFG_ANON_SWAP,
  94         CFG_AUTO_MOUNT,
  95         CFG_AUTO_SWAP,
  96         CFG_DELAY_ROOT,
  97         CFG_CHECK_FS,
  98         __CFG_MAX
  99 };
 100
 101 static const struct blobmsg_policy config_policy[__CFG_MAX] = {
 102         [CFG_ANON_SWAP] = { .name = "anon_swap", .type = BLOBMSG_TYPE_INT32 },
 103         [CFG_ANON_MOUNT] = { .name = "anon_mount", .type = BLOBMSG_TYPE_INT32 },
 104         [CFG_AUTO_SWAP] = { .name = "auto_swap", .type = BLOBMSG_TYPE_INT32 },
 105         [CFG_AUTO_MOUNT] = { .name = "auto_mount", .type = BLOBMSG_TYPE_INT32 },
 106         [CFG_DELAY_ROOT] = { .name = "delay_root", .type = BLOBMSG_TYPE_INT32 },
 107         [CFG_CHECK_FS] = { .name = "check_fs", .type = BLOBMSG_TYPE_INT32 },
 108 };
 109
 110 enum {
 111         MOUNT_UUID,
 112         MOUNT_LABEL,
 113         MOUNT_ENABLE,
 114         MOUNT_TARGET,
 115         MOUNT_DEVICE,
 116         MOUNT_OPTIONS,
 117         MOUNT_AUTOFS,
 118         __MOUNT_MAX
 119 };
 120
 121 static const struct uci_blob_param_list config_attr_list = {
 122         .n_params = __CFG_MAX,
 123         .params = config_policy,
 124 };
 125
 126 static const struct blobmsg_policy mount_policy[__MOUNT_MAX] = {
 127         [MOUNT_UUID] = { .name = "uuid", .type = BLOBMSG_TYPE_STRING },
 128         [MOUNT_LABEL] = { .name = "label", .type = BLOBMSG_TYPE_STRING },
 129         [MOUNT_DEVICE] = { .name = "device", .type = BLOBMSG_TYPE_STRING },
 130         [MOUNT_TARGET] = { .name = "target", .type = BLOBMSG_TYPE_STRING },
 131         [MOUNT_OPTIONS] = { .name = "options", .type = BLOBMSG_TYPE_STRING },
 132         [MOUNT_ENABLE] = { .name = "enabled", .type = BLOBMSG_TYPE_INT32 },
 133         [MOUNT_AUTOFS] = { .name = "autofs", .type = BLOBMSG_TYPE_INT32 },
 134 };
 135
 136 static const struct uci_blob_param_list mount_attr_list = {
 137         .n_params = __MOUNT_MAX,
 138         .params = mount_policy,
 139 };
 140
 141 enum {
 142         SWAP_ENABLE,
 143         SWAP_UUID,
 144         SWAP_LABEL,
 145         SWAP_DEVICE,
 146         SWAP_PRIO,
 147         __SWAP_MAX
 148 };
 149
 150 static const struct blobmsg_policy swap_policy[__SWAP_MAX] = {
 151         [SWAP_ENABLE] = { .name = "enabled", .type = BLOBMSG_TYPE_INT32 },
 152         [SWAP_UUID] = { .name = "uuid", .type = BLOBMSG_TYPE_STRING },
 153         [SWAP_LABEL] = { .name = "label", .type = BLOBMSG_TYPE_STRING },
 154         [SWAP_DEVICE] = { .name = "device", .type = BLOBMSG_TYPE_STRING },
 155         [SWAP_PRIO] = { .name = "priority", .type = BLOBMSG_TYPE_INT32 },
 156 };
 157
 158 static const struct uci_blob_param_list swap_attr_list = {
 159         .n_params = __SWAP_MAX,
 160         .params = swap_policy,
 161 };
 162
 163 struct mount_flag {
 164         const char *name;
 165         int32_t flag;
 166 };
 167
 168 static const struct mount_flag mount_flags[] = {
 169         { "sync",               MS_SYNCHRONOUS  },
 170         { "async",              ~MS_SYNCHRONOUS },
 171         { "dirsync",            MS_DIRSYNC      },
 172         { "mand",               MS_MANDLOCK     },
 173         { "nomand",             ~MS_MANDLOCK    },
 174         { "atime",              ~MS_NOATIME     },
 175         { "noatime",            MS_NOATIME      },
 176         { "dev",                ~MS_NODEV       },
 177         { "nodev",              MS_NODEV        },
 178         { "diratime",           ~MS_NODIRATIME  },
 179         { "nodiratime",         MS_NODIRATIME   },
 180         { "exec",               ~MS_NOEXEC      },
 181         { "noexec",             MS_NOEXEC       },
 182         { "suid",               ~MS_NOSUID      },
 183         { "nosuid",             MS_NOSUID       },
 184         { "rw",                 ~MS_RDONLY      },
 185         { "ro",                 MS_RDONLY       },
 186         { "relatime",           MS_RELATIME     },
 187         { "norelatime",         ~MS_RELATIME    },
 188         { "strictatime",        MS_STRICTATIME  },
 189         { "acl",                MS_POSIXACL     },
 190         { "noacl",              ~MS_POSIXACL    },
 191         { "nouser_xattr",       MS_NOUSER       },
 192         { "user_xattr",         ~MS_NOUSER      },
 193 };
 194
 195 static char *blobmsg_get_strdup(struct blob_attr *attr)
 196 {
 197         if (!attr)
 198                 return NULL;
 199
 200         return strdup(blobmsg_get_string(attr));
 201 }
 202
 203 static char *blobmsg_get_basename(struct blob_attr *attr)
 204 {
 205         if (!attr)
 206                 return NULL;
 207
 208         return strdup(basename(blobmsg_get_string(attr)));
 209 }
 210
 211 static void parse_mount_options(struct mount *m, char *optstr)
 212 {
 213         int i;
 214         bool is_flag;
 215         char *p, *opts, *last;
 216
 217         m->flags = 0;
 218         m->options = NULL;
 219
 220         if (!optstr || !*optstr)
 221                 return;
 222
 223         m->options = opts = calloc(1, strlen(optstr) + 1);
 224
 225         if (!m->options)
 226                 return;
 227
 228         p = last = optstr;
 229
 230         do {
 231                 p = strchr(p, ',');
 232
 233                 if (p)
 234                         *p++ = 0;
 235
 236                 for (i = 0, is_flag = false; i < ARRAY_SIZE(mount_flags); i++) {
 237                         if (!strcmp(last, mount_flags[i].name)) {
 238                                 if (mount_flags[i].flag < 0)
 239                                         m->flags &= (uint32_t)mount_flags[i].flag;
 240                                 else
 241                                         m->flags |= (uint32_t)mount_flags[i].flag;
 242                                 is_flag = true;
 243                                 break;
 244                         }
 245                 }
 246
 247                 if (!is_flag)
 248                         opts += sprintf(opts, "%s%s", (opts > m->options) ? "," : "", last);
 249
 250                 last = p;
 251
 252         } while (p);
 253
 254         free(optstr);
 255 }
 256
 257 static int mount_add(struct uci_section *s)
 258 {
 259         struct blob_attr *tb[__MOUNT_MAX] = { 0 };
 260         struct mount *m;
 261
 262         blob_buf_init(&b, 0);
 263         uci_to_blob(&b, s, &mount_attr_list);
 264         blobmsg_parse(mount_policy, __MOUNT_MAX, tb, blob_data(b.head), blob_len(b.head));
 265
 266         if (!tb[MOUNT_LABEL] && !tb[MOUNT_UUID] && !tb[MOUNT_DEVICE])
 267                 return -1;
 268
 269         if (tb[MOUNT_ENABLE] && !blobmsg_get_u32(tb[MOUNT_ENABLE]))
 270                 return -1;
 271
 272         m = malloc(sizeof(struct mount));
 273         m->type = TYPE_MOUNT;
 274         m->uuid = blobmsg_get_strdup(tb[MOUNT_UUID]);
 275         m->label = blobmsg_get_strdup(tb[MOUNT_LABEL]);
 276         m->target = blobmsg_get_strdup(tb[MOUNT_TARGET]);
 277         m->device = blobmsg_get_basename(tb[MOUNT_DEVICE]);
 278         if (tb[MOUNT_AUTOFS])
 279                 m->autofs = blobmsg_get_u32(tb[MOUNT_AUTOFS]);
 280         else
 281                 m->autofs = 0;
 282         parse_mount_options(m, blobmsg_get_strdup(tb[MOUNT_OPTIONS]));
 283
 284         m->overlay = m->extroot = 0;
 285         if (m->target && !strcmp(m->target, "/"))
 286                 m->extroot = 1;
 287         if (m->target && !strcmp(m->target, "/overlay"))
 288                 m->extroot = m->overlay = 1;
 289
 290         if (m->target && *m->target != '/') {
 291                 ULOG_WARN("ignoring mount section %s due to invalid target '%s'\n",
 292                           s->e.name, m->target);
 293                 free(m);
 294                 return -1;
 295         }
 296
 297         if (m->uuid)
 298                 vlist_add(&mounts, &m->node, m->uuid);
 299         else if (m->label)
 300                 vlist_add(&mounts, &m->node, m->label);
 301         else if (m->device)
 302                 vlist_add(&mounts, &m->node, m->device);
 303
 304         return 0;
 305 }
 306
 307 static int swap_add(struct uci_section *s)
 308 {
 309         struct blob_attr *tb[__SWAP_MAX] = { 0 };
 310         struct mount *m;
 311
 312         blob_buf_init(&b, 0);
 313         uci_to_blob(&b, s, &swap_attr_list);
 314         blobmsg_parse(swap_policy, __SWAP_MAX, tb, blob_data(b.head), blob_len(b.head));
 315
 316         if (!tb[SWAP_UUID] && !tb[SWAP_LABEL] && !tb[SWAP_DEVICE])
 317                 return -1;
 318
 319         m = malloc(sizeof(struct mount));
 320         memset(m, 0, sizeof(struct mount));
 321         m->type = TYPE_SWAP;
 322         m->uuid = blobmsg_get_strdup(tb[SWAP_UUID]);
 323         m->label = blobmsg_get_strdup(tb[SWAP_LABEL]);
 324         m->device = blobmsg_get_basename(tb[SWAP_DEVICE]);
 325         if (tb[SWAP_PRIO])
 326                 m->prio = blobmsg_get_u32(tb[SWAP_PRIO]);
 327         if (m->prio)
 328                 m->prio = ((m->prio << SWAP_FLAG_PRIO_SHIFT) & SWAP_FLAG_PRIO_MASK) | SWAP_FLAG_PREFER;
 329
 330         if ((!tb[SWAP_ENABLE]) || blobmsg_get_u32(tb[SWAP_ENABLE])) {
 331                 /* store complete swap path */
 332                 if (tb[SWAP_DEVICE])
 333                         m->target = blobmsg_get_strdup(tb[SWAP_DEVICE]);
 334
 335                 if (m->uuid)
 336                         vlist_add(&mounts, &m->node, m->uuid);
 337                 else if (m->label)
 338                         vlist_add(&mounts, &m->node, m->label);
 339                 else if (m->device)
 340                         vlist_add(&mounts, &m->node, m->device);
 341         }
 342
 343         return 0;
 344 }
 345
 346 static int global_add(struct uci_section *s)
 347 {
 348         struct blob_attr *tb[__CFG_MAX] = { 0 };
 349
 350         blob_buf_init(&b, 0);
 351         uci_to_blob(&b, s, &config_attr_list);
 352         blobmsg_parse(config_policy, __CFG_MAX, tb, blob_data(b.head), blob_len(b.head));
 353
 354         if ((tb[CFG_ANON_MOUNT]) && blobmsg_get_u32(tb[CFG_ANON_MOUNT]))
 355                 anon_mount = 1;
 356         if ((tb[CFG_ANON_SWAP]) && blobmsg_get_u32(tb[CFG_ANON_SWAP]))
 357                 anon_swap = 1;
 358
 359         if ((tb[CFG_AUTO_MOUNT]) && blobmsg_get_u32(tb[CFG_AUTO_MOUNT]))
 360                 auto_mount = 1;
 361         if ((tb[CFG_AUTO_SWAP]) && blobmsg_get_u32(tb[CFG_AUTO_SWAP]))
 362                 auto_swap = 1;
 363
 364         if (tb[CFG_DELAY_ROOT])
 365                 delay_root = blobmsg_get_u32(tb[CFG_DELAY_ROOT]);
 366
 367         if ((tb[CFG_CHECK_FS]) && blobmsg_get_u32(tb[CFG_CHECK_FS]))
 368                 check_fs = 1;
 369
 370         return 0;
 371 }
 372
 373 static struct mount* find_swap(const char *uuid, const char *label, const char *device)
 374 {
 375         struct mount *m;
 376
 377         vlist_for_each_element(&mounts, m, node) {
 378                 if (m->type != TYPE_SWAP)
 379                         continue;
 380                 if (uuid && m->uuid && !strcasecmp(m->uuid, uuid))
 381                         return m;
 382                 if (label && m->label && !strcmp(m->label, label))
 383                         return m;
 384                 if (device && m->device && !strcmp(m->device, device))
 385                         return m;
 386         }
 387
 388         return NULL;
 389 }
 390
 391 static struct mount* find_block(const char *uuid, const char *label, const char *device,
 392                                 const char *target)
 393 {
 394         struct mount *m;
 395
 396         vlist_for_each_element(&mounts, m, node) {
 397                 if (m->type != TYPE_MOUNT)
 398                         continue;
 399                 if (m->uuid && uuid && !strcasecmp(m->uuid, uuid))
 400                         return m;
 401                 if (m->label && label && !strcmp(m->label, label))
 402                         return m;
 403                 if (m->target && target && !strcmp(m->target, target))
 404                         return m;
 405                 if (m->device && device && !strcmp(m->device, device))
 406                         return m;
 407         }
 408
 409         return NULL;
 410 }
 411
 412 static void mounts_update(struct vlist_tree *tree, struct vlist_node *node_new,
 413                           struct vlist_node *node_old)
 414 {
 415 }
 416
 417 static struct uci_package * config_try_load(struct uci_context *ctx, char *path)
 418 {
 419         char *file = basename(path);
 420         char *dir = dirname(path);
 421         char *err;
 422         struct uci_package *pkg;
 423
 424         uci_set_confdir(ctx, dir);
 425         ULOG_INFO("attempting to load %s/%s\n", dir, file);
 426
 427         if (uci_load(ctx, file, &pkg)) {
 428                 uci_get_errorstr(ctx, &err, file);
 429                 ULOG_ERR("unable to load configuration (%s)\n", err);
 430
 431                 free(err);
 432                 return NULL;
 433         }
 434
 435         return pkg;
 436 }
 437
 438 static int config_load(char *cfg)
 439 {
 440         struct uci_context *ctx = uci_alloc_context();
 441         struct uci_package *pkg = NULL;
 442         struct uci_element *e;
 443         char path[64];
 444
 445         vlist_init(&mounts, avl_strcmp, mounts_update);
 446
 447         if (cfg) {
 448                 snprintf(path, sizeof(path), "%s/upper/etc/config/fstab", cfg);
 449                 pkg = config_try_load(ctx, path);
 450
 451                 if (!pkg) {
 452                         snprintf(path, sizeof(path), "%s/etc/config/fstab", cfg);
 453                         pkg = config_try_load(ctx, path);
 454                 }
 455         }
 456
 457         if (!pkg) {
 458                 snprintf(path, sizeof(path), "/etc/config/fstab");
 459                 pkg = config_try_load(ctx, path);
 460         }
 461
 462         if (!pkg) {
 463                 ULOG_ERR("no usable configuration\n");
 464                 return -1;
 465         }
 466
 467         vlist_update(&mounts);
 468         uci_foreach_element(&pkg->sections, e) {
 469                 struct uci_section *s = uci_to_section(e);
 470
 471                 if (!strcmp(s->type, "mount"))
 472                         mount_add(s);
 473                 if (!strcmp(s->type, "swap"))
 474                         swap_add(s);
 475                 if (!strcmp(s->type, "global"))
 476                         global_add(s);
 477         }
 478         vlist_flush(&mounts);
 479
 480         return 0;
 481 }
 482
 483 static struct probe_info* _probe_path(char *path)
 484 {
 485         struct probe_info *pr;
 486         char tmppath[64];
 487
 488         /* skip ubi device if ubiblock device is present */
 489         if (path[5] == 'u' && path[6] == 'b' && path[7] == 'i' &&
 490             path[8] >= '0' && path[8] <= '9' ) {
 491                 snprintf(tmppath, sizeof(tmppath), "/dev/ubiblock%s", path + 8);
 492                 list_for_each_entry(pr, &devices, list)
 493                         if (!strcasecmp(pr->dev, tmppath))
 494                                 return NULL;
 495         }
 496
 497         return probe_path(path);
 498 }
 499
 500 static int _cache_load(const char *path)
 501 {
 502         int gl_flags = GLOB_NOESCAPE | GLOB_MARK;
 503         int j;
 504         glob_t gl;
 505
 506         if (glob(path, gl_flags, NULL, &gl) < 0)
 507                 return -1;
 508
 509         for (j = 0; j < gl.gl_pathc; j++) {
 510                 struct probe_info *pr = _probe_path(gl.gl_pathv[j]);
 511                 if (pr)
 512                         list_add_tail(&pr->list, &devices);
 513         }
 514
 515         globfree(&gl);
 516
 517         return 0;
 518 }
 519
 520 static void cache_load(int mtd)
 521 {
 522         if (mtd) {
 523                 _cache_load("/dev/mtdblock*");
 524                 _cache_load("/dev/ubiblock*");
 525                 _cache_load("/dev/ubi[0-9]*");
 526         }
 527         _cache_load("/dev/loop*");
 528         _cache_load("/dev/mmcblk*");
 529         _cache_load("/dev/sd*");
 530         _cache_load("/dev/hd*");
 531         _cache_load("/dev/md*");
 532         _cache_load("/dev/vd*");
 533         _cache_load("/dev/mapper/*");
 534 }
 535
 536
 537 static int print_block_uci(struct probe_info *pr)
 538 {
 539         if (!strcmp(pr->type, "swap")) {
 540                 printf("config 'swap'\n");
 541         } else {
 542                 printf("config 'mount'\n");
 543                 printf("\toption\ttarget\t'/mnt/%s'\n", basename(pr->dev));
 544         }
 545         if (pr->uuid)
 546                 printf("\toption\tuuid\t'%s'\n", pr->uuid);
 547         else
 548                 printf("\toption\tdevice\t'%s'\n", pr->dev);
 549         printf("\toption\tenabled\t'0'\n\n");
 550
 551         return 0;
 552 }
 553
 554 static struct probe_info* find_block_info(char *uuid, char *label, char *path)
 555 {
 556         struct probe_info *pr = NULL;
 557
 558         if (uuid)
 559                 list_for_each_entry(pr, &devices, list)
 560                         if (pr->uuid && !strcasecmp(pr->uuid, uuid))
 561                                 return pr;
 562
 563         if (label)
 564                 list_for_each_entry(pr, &devices, list)
 565                         if (pr->label && !strcmp(pr->label, label))
 566                                 return pr;
 567
 568         if (path)
 569                 list_for_each_entry(pr, &devices, list)
 570                         if (pr->dev && !strcmp(basename(pr->dev), basename(path)))
 571                                 return pr;
 572
 573         return NULL;
 574 }
 575
 576 static char* find_mount_point(char *block)
 577 {
 578         FILE *fp = fopen("/proc/self/mountinfo", "r");
 579         static char line[256];
 580         int len = strlen(block);
 581         char *point = NULL, *pos, *tmp, *cpoint, *devname;
 582         struct stat s;
 583         int rstat;
 584         unsigned int minor, major;
 585
 586         if (!fp)
 587                 return NULL;
 588
 589         rstat = stat(block, &s);
 590
 591         while (fgets(line, sizeof(line), fp)) {
 592                 pos = strchr(line, ' ');
 593                 if (!pos)
 594                         continue;
 595
 596                 pos = strchr(pos + 1, ' ');
 597                 if (!pos)
 598                         continue;
 599
 600                 tmp = ++pos;
 601                 pos = strchr(pos, ':');
 602                 if (!pos)
 603                         continue;
 604
 605                 *pos = '\0';
 606                 major = atoi(tmp);
 607                 tmp = ++pos;
 608                 pos = strchr(pos, ' ');
 609                 if (!pos)
 610                         continue;
 611
 612                 *pos = '\0';
 613                 minor = atoi(tmp);
 614                 pos = strchr(pos + 1, ' ');
 615                 if (!pos)
 616                         continue;
 617                 tmp = ++pos;
 618
 619                 pos = strchr(pos, ' ');
 620                 if (!pos)
 621                         continue;
 622                 *pos = '\0';
 623                 cpoint = tmp;
 624
 625                 pos = strchr(pos + 1, ' ');
 626                 if (!pos)
 627                         continue;
 628
 629                 pos = strchr(pos + 1, ' ');
 630                 if (!pos)
 631                         continue;
 632
 633                 pos = strchr(pos + 1, ' ');
 634                 if (!pos)
 635                         continue;
 636
 637                 tmp = ++pos;
 638                 pos = strchr(pos, ' ');
 639                 if (!pos)
 640                         continue;
 641
 642                 *pos = '\0';
 643                 devname = tmp;
 644                 if (!strncmp(block, devname, len)) {
 645                         point = strdup(cpoint);
 646                         break;
 647                 }
 648
 649                 if (rstat)
 650                         continue;
 651
 652                 if (!S_ISBLK(s.st_mode))
 653                         continue;
 654
 655                 if (major == major(s.st_rdev) &&
 656                     minor == minor(s.st_rdev)) {
 657                         point = strdup(cpoint);
 658                         break;
 659                 }
 660         }
 661
 662         fclose(fp);
 663
 664         return point;
 665 }
 666
 667 static int print_block_info(struct probe_info *pr)
 668 {
 669         static char *mp;
 670
 671         mp = find_mount_point(pr->dev);
 672         printf("%s:", pr->dev);
 673         if (pr->uuid)
 674                 printf(" UUID=\"%s\"", pr->uuid);
 675
 676         if (pr->label)
 677                 printf(" LABEL=\"%s\"", pr->label);
 678
 679         if (pr->version)
 680                 printf(" VERSION=\"%s\"", pr->version);
 681
 682         if (mp) {
 683                 printf(" MOUNT=\"%s\"", mp);
 684                 free(mp);
 685         }
 686
 687         printf(" TYPE=\"%s\"\n", pr->type);
 688
 689         return 0;
 690 }
 691
 692 static void mkdir_p(char *dir)
 693 {
 694         char *l = strrchr(dir, '/');
 695
 696         if (l) {
 697                 *l = '\0';
 698                 mkdir_p(dir);
 699                 *l = '/';
 700                 mkdir(dir, 0755);
 701         }
 702 }
 703
 704 static void check_filesystem(struct probe_info *pr)
 705 {
 706         pid_t pid;
 707         struct stat statbuf;
 708         const char *e2fsck = "/usr/sbin/e2fsck";
 709         const char *f2fsck = "/usr/sbin/fsck.f2fs";
 710         const char *dosfsck = "/usr/sbin/dosfsck";
 711         const char *ckfs;
 712
 713         /* UBIFS does not need stuff like fsck */
 714         if (!strncmp(pr->type, "ubifs", 5))
 715                 return;
 716
 717         if (!strncmp(pr->type, "vfat", 4)) {
 718                 ckfs = dosfsck;
 719         } else if (!strncmp(pr->type, "f2fs", 4)) {
 720                 ckfs = f2fsck;
 721         } else if (!strncmp(pr->type, "ext", 3)) {
 722                 ckfs = e2fsck;
 723         } else {
 724                 ULOG_ERR("check_filesystem: %s is not supported\n", pr->type);
 725                 return;
 726         }
 727
 728         if (stat(ckfs, &statbuf) < 0) {
 729                 ULOG_ERR("check_filesystem: %s not found\n", ckfs);
 730                 return;
 731         }
 732
 733         pid = fork();
 734         if (!pid) {
 735                 if(!strncmp(pr->type, "f2fs", 4)) {
 736                         execl(ckfs, ckfs, "-f", pr->dev, NULL);
 737                         exit(-1);
 738                 } else {
 739                         execl(ckfs, ckfs, "-p", pr->dev, NULL);
 740                         exit(-1);
 741                 }
 742         } else if (pid > 0) {
 743                 int status;
 744
 745                 waitpid(pid, &status, 0);
 746                 if (WEXITSTATUS(status))
 747                         ULOG_ERR("check_filesystem: %s returned %d\n", ckfs, WEXITSTATUS(status));
 748         }
 749 }
 750
 751 static void handle_swapfiles(bool on)
 752 {
 753         struct stat s;
 754         struct mount *m;
 755         struct probe_info *pr;
 756
 757         vlist_for_each_element(&mounts, m, node)
 758         {
 759                 if (m->type != TYPE_SWAP || !m->target)
 760                         continue;
 761
 762                 if (stat(m->target, &s) || !S_ISREG(s.st_mode))
 763                         continue;
 764
 765                 pr = _probe_path(m->target);
 766
 767                 if (!pr)
 768                         continue;
 769
 770                 if (!strcmp(pr->type, "swap")) {
 771                         if (on)
 772                                 swapon(pr->dev, m->prio);
 773                         else
 774                                 swapoff(pr->dev);
 775                 }
 776
 777                 free(pr);
 778         }
 779 }
 780
 781 static void to_devnull(int fd)
 782 {
 783         int devnull = open("/dev/null", fd ? O_WRONLY : O_RDONLY);
 784
 785         if (devnull >= 0)
 786                 dup2(devnull, fd);
 787
 788         if (devnull > STDERR_FILENO)
 789                 close(devnull);
 790 }
 791
 792 static int exec_mount(const char *source, const char *target,
 793                       const char *fstype, const char *options)
 794 {
 795         pid_t pid;
 796         struct stat s;
 797         FILE *mount_fd;
 798         int err, status, pfds[2];
 799         char errmsg[128], cmd[sizeof("/sbin/mount.XXXXXXXXXXXXXXXX\0")];
 800
 801         snprintf(cmd, sizeof(cmd), "/sbin/mount.%s", fstype);
 802
 803         if (stat(cmd, &s) < 0 || !S_ISREG(s.st_mode) || !(s.st_mode & S_IXUSR)) {
 804                 ULOG_ERR("No \"mount.%s\" utility available\n", fstype);
 805                 return -1;
 806         }
 807
 808         if (pipe(pfds) < 0)
 809                 return -1;
 810
 811         fcntl(pfds[0], F_SETFD, fcntl(pfds[0], F_GETFD) | FD_CLOEXEC);
 812         fcntl(pfds[1], F_SETFD, fcntl(pfds[1], F_GETFD) | FD_CLOEXEC);
 813
 814         pid = vfork();
 815
 816         switch (pid) {
 817         case -1:
 818                 close(pfds[0]);
 819                 close(pfds[1]);
 820
 821                 return -1;
 822
 823         case 0:
 824                 to_devnull(STDIN_FILENO);
 825                 to_devnull(STDOUT_FILENO);
 826
 827                 dup2(pfds[1], STDERR_FILENO);
 828                 close(pfds[0]);
 829                 close(pfds[1]);
 830
 831                 if (options && *options)
 832                         execl(cmd, cmd, "-o", options, source, target, NULL);
 833                 else
 834                         execl(cmd, cmd, source, target, NULL);
 835
 836                 return -1;
 837
 838         default:
 839                 close(pfds[1]);
 840
 841                 mount_fd = fdopen(pfds[0], "r");
 842
 843                 while (fgets(errmsg, sizeof(errmsg), mount_fd))
 844                         ULOG_ERR("mount.%s: %s", fstype, errmsg);
 845
 846                 fclose(mount_fd);
 847
 848                 err = waitpid(pid, &status, 0);
 849
 850                 if (err != -1) {
 851                         if (status != 0) {
 852                                 ULOG_ERR("mount.%s: failed with status %d\n", fstype, status);
 853                                 errno = EINVAL;
 854                                 err = -1;
 855                         } else {
 856                                 errno = 0;
 857                                 err = 0;
 858                         }
 859                 }
 860
 861                 break;
 862         }
 863
 864         return err;
 865 }
 866
 867 static int handle_mount(const char *source, const char *target,
 868                         const char *fstype, struct mount *m)
 869 {
 870         int i, err;
 871         size_t mount_opts_len;
 872         char *mount_opts = NULL, *ptr;
 873
 874         err = mount(source, target, fstype, m ? m->flags : 0,
 875                     (m && m->options) ? m->options : "");
 876
 877         /* Requested file system type is not available in kernel,
 878            attempt to call mount helper. */
 879         if (err == -1 && errno == ENODEV) {
 880                 if (m) {
 881                         /* Convert mount flags back into string representation,
 882                            first calculate needed length of string buffer... */
 883                         mount_opts_len = 1 + (m->options ? strlen(m->options) : 0);
 884
 885                         for (i = 0; i < ARRAY_SIZE(mount_flags); i++)
 886                                 if ((mount_flags[i].flag > 0) &&
 887                                     (mount_flags[i].flag < INT_MAX) &&
 888                                     (m->flags & (uint32_t)mount_flags[i].flag))
 889                                         mount_opts_len += strlen(mount_flags[i].name) + 1;
 890
 891                         /* ... then now allocate and fill it ... */
 892                         ptr = mount_opts = calloc(1, mount_opts_len);
 893
 894                         if (!ptr) {
 895                                 errno = ENOMEM;
 896                                 return -1;
 897                         }
 898
 899                         if (m->options)
 900                                 ptr += sprintf(ptr, "%s,", m->options);
 901
 902                         for (i = 0; i < ARRAY_SIZE(mount_flags); i++)
 903                                 if ((mount_flags[i].flag > 0) &&
 904                                     (mount_flags[i].flag < INT_MAX) &&
 905                                     (m->flags & (uint32_t)mount_flags[i].flag))
 906                                         ptr += sprintf(ptr, "%s,", mount_flags[i].name);
 907
 908                         mount_opts[mount_opts_len - 1] = 0;
 909                 }
 910
 911                 /* ... and now finally invoke the external mount program */
 912                 err = exec_mount(source, target, fstype, mount_opts);
 913         }
 914
 915         return err;
 916 }
 917
 918 static void blockd_notify(char *device, struct mount *m, struct probe_info *pr)
 919 {
 920         struct ubus_context *ctx = ubus_connect(NULL);
 921         uint32_t id;
 922
 923         if (!ctx)
 924                 return;
 925
 926         if (!ubus_lookup_id(ctx, "block", &id)) {
 927                 struct blob_buf buf = { 0 };
 928                 char *d = strrchr(device, '/');
 929
 930                 if (d)
 931                         d++;
 932                 else
 933                         d = device;
 934
 935                 blob_buf_init(&buf, 0);
 936
 937                 if (m) {
 938
 939                         blobmsg_add_string(&buf, "device", d);
 940                         if (m->uuid)
 941                                 blobmsg_add_string(&buf, "uuid", m->uuid);
 942                         if (m->label)
 943                                 blobmsg_add_string(&buf, "label", m->label);
 944                         if (m->target)
 945                                 blobmsg_add_string(&buf, "target", m->target);
 946                         if (m->options)
 947                                 blobmsg_add_string(&buf, "options", m->options);
 948                         if (m->autofs)
 949                                 blobmsg_add_u32(&buf, "autofs", m->autofs);
 950                         if (pr->type)
 951                                 blobmsg_add_string(&buf, "type", pr->type);
 952                         if (pr->version)
 953                                 blobmsg_add_string(&buf, "version", pr->version);
 954                 } else if (pr) {
 955                         blobmsg_add_string(&buf, "device", d);
 956                         if (pr->uuid)
 957                                 blobmsg_add_string(&buf, "uuid", pr->uuid);
 958                         if (pr->label)
 959                                 blobmsg_add_string(&buf, "label", pr->label);
 960                         if (pr->type)
 961                                 blobmsg_add_string(&buf, "type", pr->type);
 962                         if (pr->version)
 963                                 blobmsg_add_string(&buf, "version", pr->version);
 964                         blobmsg_add_u32(&buf, "anon", 1);
 965                 } else {
 966                         blobmsg_add_string(&buf, "device", d);
 967                         blobmsg_add_u32(&buf, "remove", 1);
 968                 }
 969
 970                 ubus_invoke(ctx, id, "hotplug", buf.head, NULL, NULL, 3000);
 971         }
 972
 973         ubus_free(ctx);
 974 }
 975
 976 static int mount_device(struct probe_info *pr, int type)
 977 {
 978         struct mount *m;
 979         char *device;
 980         char *mp;
 981
 982         if (!pr)
 983                 return -1;
 984
 985         device = basename(pr->dev);
 986
 987         if (!strcmp(pr->type, "swap")) {
 988                 if ((type == TYPE_HOTPLUG) && !auto_swap)
 989                         return -1;
 990                 m = find_swap(pr->uuid, pr->label, device);
 991                 if (m || anon_swap)
 992                         swapon(pr->dev, (m) ? (m->prio) : (0));
 993
 994                 return 0;
 995         }
 996
 997         mp = find_mount_point(pr->dev);
 998         if (mp && (type != TYPE_HOTPLUG)) {
 999                 ULOG_ERR("%s is already mounted on %s\n", pr->dev, mp);
1000                 free(mp);
1001                 return -1;
1002         }
1003
1004         m = find_block(pr->uuid, pr->label, device, NULL);
1005         if (m && m->extroot)
1006                 return -1;
1007
1008         if (m) switch (type) {
1009         case TYPE_HOTPLUG:
1010                 blockd_notify(device, m, pr);
1011                 if (m->autofs)
1012                         return 0;
1013                 if (!auto_mount)
1014                         return -1;
1015                 break;
1016         case TYPE_AUTOFS:
1017                 if (!m->autofs)
1018                         return -1;
1019                 break;
1020         case TYPE_DEV:
1021                 if (m->autofs)
1022                         return -1;
1023                 break;
1024         } else if (type == TYPE_HOTPLUG) {
1025                 blockd_notify(device, NULL, pr);
1026         }
1027
1028         if (m) {
1029                 char *target = m->target;
1030                 char _target[32];
1031                 int err = 0;
1032
1033                 if (m->autofs) {
1034                         snprintf(_target, sizeof(_target), "/tmp/run/blockd/%s", device);
1035                         target = _target;
1036                 }
1037                 if (!target) {
1038                         snprintf(_target, sizeof(_target), "/mnt/%s", device);
1039                         target = _target;
1040                 }
1041                 mkdir_p(target);
1042
1043                 if (check_fs)
1044                         check_filesystem(pr);
1045
1046                 err = handle_mount(pr->dev, target, pr->type, m);
1047                 if (err)
1048                         ULOG_ERR("mounting %s (%s) as %s failed (%d) - %s\n",
1049                                  pr->dev, pr->type, target, errno, strerror(errno));
1050                 else
1051                         handle_swapfiles(true);
1052                 return err;
1053         }
1054
1055         if (anon_mount) {
1056                 char target[32];
1057                 int err = 0;
1058
1059                 snprintf(target, sizeof(target), "/mnt/%s", device);
1060                 mkdir_p(target);
1061
1062                 if (check_fs)
1063                         check_filesystem(pr);
1064
1065                 err = handle_mount(pr->dev, target, pr->type, NULL);
1066                 if (err)
1067                         ULOG_ERR("mounting %s (%s) as %s failed (%d) - %s\n",
1068                                  pr->dev, pr->type, target, errno, strerror(errno));
1069                 else
1070                         handle_swapfiles(true);
1071                 return err;
1072         }
1073
1074         return 0;
1075 }
1076
1077 static int umount_device(struct probe_info *pr)
1078 {
1079         struct mount *m;
1080         char *device = basename(pr->dev);
1081         char *mp;
1082         int err;
1083
1084         if (!pr)
1085                 return -1;
1086
1087         if (!strcmp(pr->type, "swap"))
1088                 return -1;
1089
1090         mp = find_mount_point(pr->dev);
1091         if (!mp)
1092                 return -1;
1093
1094         m = find_block(pr->uuid, pr->label, device, NULL);
1095         if (m && m->extroot)
1096                 return -1;
1097
1098         err = umount2(mp, MNT_DETACH);
1099         if (err)
1100                 ULOG_ERR("unmounting %s (%s)  failed (%d) - %s\n",
1101                          pr->dev, mp, errno, strerror(errno));
1102         else
1103                 ULOG_INFO("unmounted %s (%s)\n",
1104                           pr->dev, mp);
1105
1106         free(mp);
1107         return err;
1108 }
1109
1110 static int mount_action(char *action, char *device, int type)
1111 {
1112         char path[32];
1113         char *mount_point;
1114
1115         if (!action || !device)
1116                 return -1;
1117         snprintf(path, sizeof(path), "/dev/%s", device);
1118
1119         if (!strcmp(action, "remove")) {
1120                 int err = 0;
1121
1122                 if (type == TYPE_HOTPLUG)
1123                         blockd_notify(device, NULL, NULL);
1124
1125                 mount_point = find_mount_point(path);
1126                 if (mount_point)
1127                         err = umount2(mount_point, MNT_DETACH);
1128
1129                 if (err)
1130                         ULOG_ERR("umount of %s failed (%d) - %s\n",
1131                                  mount_point, errno, strerror(errno));
1132
1133                 free(mount_point);
1134                 return 0;
1135         } else if (strcmp(action, "add")) {
1136                 ULOG_ERR("Unkown action %s\n", action);
1137
1138                 return -1;
1139         }
1140
1141         if (config_load(NULL))
1142                 return -1;
1143         cache_load(0);
1144
1145         return mount_device(find_block_info(NULL, NULL, path), type);
1146 }
1147
1148 static int main_hotplug(int argc, char **argv)
1149 {
1150         return mount_action(getenv("ACTION"), getenv("DEVNAME"), TYPE_HOTPLUG);
1151 }
1152
1153 static int main_autofs(int argc, char **argv)
1154 {
1155         if (argc < 3)
1156                 return -1;
1157
1158         if (!strcmp(argv[2], "start")) {
1159                 struct probe_info *pr;
1160
1161                 if (config_load(NULL))
1162                         return -1;
1163
1164                 cache_load(0);
1165                 list_for_each_entry(pr, &devices, list) {
1166                         struct mount *m = find_block(pr->uuid, pr->label, NULL, NULL);
1167
1168                         if (m && m->autofs)
1169                                 mount_device(pr, TYPE_HOTPLUG);
1170                         else
1171                                 blockd_notify(pr->dev, m, pr);
1172                 }
1173                 return 0;
1174         }
1175         return mount_action(argv[2], argv[3], TYPE_AUTOFS);
1176 }
1177
1178 static int find_block_mtd(char *name, char *part, int plen)
1179 {
1180         FILE *fp = fopen("/proc/mtd", "r");
1181         static char line[256];
1182         char *index = NULL;
1183
1184         if(!fp)
1185                 return -1;
1186
1187         while (!index && fgets(line, sizeof(line), fp)) {
1188                 if (strstr(line, name)) {
1189                         char *eol = strstr(line, ":");
1190
1191                         if (!eol)
1192                                 continue;
1193
1194                         *eol = '\0';
1195                         index = &line[3];
1196                 }
1197         }
1198
1199         fclose(fp);
1200
1201         if (!index)
1202                 return -1;
1203
1204         snprintf(part, plen, "/dev/mtdblock%s", index);
1205
1206         return 0;
1207 }
1208
1209 #ifdef UBIFS_EXTROOT
1210 static int find_ubi_vol(libubi_t libubi, char *name, int *dev_num, int *vol_id)
1211 {
1212         int dev = 0;
1213
1214         while (ubi_dev_present(libubi, dev))
1215         {
1216                 struct ubi_dev_info dev_info;
1217                 struct ubi_vol_info vol_info;
1218
1219                 if (ubi_get_dev_info1(libubi, dev++, &dev_info))
1220                         continue;
1221                 if (ubi_get_vol_info1_nm(libubi, dev_info.dev_num, name, &vol_info))
1222                         continue;
1223
1224                 *dev_num = dev_info.dev_num;
1225                 *vol_id = vol_info.vol_id;
1226
1227                 return 0;
1228         }
1229
1230         return -1;
1231 }
1232
1233 static int find_block_ubi(libubi_t libubi, char *name, char *part, int plen)
1234 {
1235         int dev_num;
1236         int vol_id;
1237         int err = -1;
1238
1239         err = find_ubi_vol(libubi, name, &dev_num, &vol_id);
1240         if (!err)
1241                 snprintf(part, plen, "/dev/ubi%d_%d", dev_num, vol_id);
1242
1243         return err;
1244 }
1245
1246 static int find_block_ubi_RO(libubi_t libubi, char *name, char *part, int plen)
1247 {
1248         int dev_num;
1249         int vol_id;
1250         int err = -1;
1251
1252         err = find_ubi_vol(libubi, name, &dev_num, &vol_id);
1253         if (!err)
1254                 snprintf(part, plen, "/dev/ubiblock%d_%d", dev_num, vol_id);
1255
1256         return err;
1257 }
1258
1259 #else
1260
1261 static int find_root_dev(char *buf, int len)
1262 {
1263         DIR *d;
1264         dev_t root;
1265         struct stat s;
1266         struct dirent *e;
1267
1268         if (stat("/", &s))
1269                 return -1;
1270
1271         if (!(d = opendir("/dev")))
1272                 return -1;
1273
1274         root = s.st_dev;
1275
1276         while ((e = readdir(d)) != NULL) {
1277                 snprintf(buf, len, "/dev/%s", e->d_name);
1278
1279                 if (stat(buf, &s) || s.st_rdev != root)
1280                         continue;
1281
1282                 closedir(d);
1283                 return 0;
1284         }
1285
1286         closedir(d);
1287         return -1;
1288 }
1289
1290 #endif
1291
1292 static int test_fs_support(const char *name)
1293 {
1294         char line[128], *p;
1295         int rv = -1;
1296         FILE *f;
1297
1298         if ((f = fopen("/proc/filesystems", "r")) != NULL) {
1299                 while (fgets(line, sizeof(line), f)) {
1300                         p = strtok(line, "\t\n");
1301
1302                         if (p && !strcmp(p, "nodev"))
1303                                 p = strtok(NULL, "\t\n");
1304
1305                         if (p && !strcmp(p, name)) {
1306                                 rv = 0;
1307                                 break;
1308                         }
1309                 }
1310                 fclose(f);
1311         }
1312
1313         return rv;
1314 }
1315
1316 static int check_extroot(char *path)
1317 {
1318         struct probe_info *pr = NULL;
1319         char devpath[32];
1320
1321 #ifdef UBIFS_EXTROOT
1322         if (find_block_mtd("\"rootfs\"", devpath, sizeof(devpath))) {
1323                 int err = -1;
1324                 libubi_t libubi;
1325
1326                 libubi = libubi_open();
1327                 err = find_block_ubi_RO(libubi, "rootfs", devpath, sizeof(devpath));
1328                 libubi_close(libubi);
1329                 if (err)
1330                         return -1;
1331         }
1332 #else
1333         if (find_block_mtd("\"rootfs\"", devpath, sizeof(devpath))) {
1334                 if (find_root_dev(devpath, sizeof(devpath))) {
1335                         ULOG_ERR("extroot: unable to determine root device\n");
1336                         return -1;
1337                 }
1338         }
1339 #endif
1340
1341         list_for_each_entry(pr, &devices, list) {
1342                 if (!strcmp(pr->dev, devpath)) {
1343                         struct stat s;
1344                         FILE *fp = NULL;
1345                         char tag[64];
1346                         char uuid[64] = { 0 };
1347
1348                         snprintf(tag, sizeof(tag), "%s/etc", path);
1349                         if (stat(tag, &s))
1350                                 mkdir_p(tag);
1351
1352                         snprintf(tag, sizeof(tag), "%s/etc/.extroot-uuid", path);
1353                         if (stat(tag, &s)) {
1354                                 fp = fopen(tag, "w+");
1355                                 if (!fp) {
1356                                         ULOG_ERR("extroot: failed to write UUID to %s: %d (%s)\n",
1357                                                  tag, errno, strerror(errno));
1358                                         /* return 0 to continue boot regardless of error */
1359                                         return 0;
1360                                 }
1361                                 fputs(pr->uuid, fp);
1362                                 fclose(fp);
1363                                 return 0;
1364                         }
1365
1366                         fp = fopen(tag, "r");
1367                         if (!fp) {
1368                                 ULOG_ERR("extroot: failed to read UUID from %s: %d (%s)\n",
1369                                          tag, errno, strerror(errno));
1370                                 return -1;
1371                         }
1372
1373                         if (!fgets(uuid, sizeof(uuid), fp))
1374                                 ULOG_ERR("extroot: failed to read UUID from %s: %d (%s)\n",
1375                                          tag, errno, strerror(errno));
1376                         fclose(fp);
1377
1378                         if (*uuid && !strcasecmp(uuid, pr->uuid))
1379                                 return 0;
1380
1381                         ULOG_ERR("extroot: UUID mismatch (root: %s, %s: %s)\n",
1382                                  pr->uuid, basename(path), uuid);
1383                         return -1;
1384                 }
1385         }
1386
1387         ULOG_ERR("extroot: unable to lookup root device %s\n", devpath);
1388         return -1;
1389 }
1390
1391 /*
1392  * Read info about extroot from UCI (using prefix) and mount it.
1393  */
1394 static int mount_extroot(char *cfg)
1395 {
1396         char overlay[] = "/tmp/extroot/overlay";
1397         char mnt[] = "/tmp/extroot/mnt";
1398         char *path = mnt;
1399         struct probe_info *pr;
1400         struct mount *m;
1401         int err = -1;
1402
1403         /* Load @cfg/etc/config/fstab */
1404         if (config_load(cfg))
1405                 return -2;
1406
1407         /* See if there is extroot-specific mount config */
1408         m = find_block(NULL, NULL, NULL, "/");
1409         if (!m)
1410                 m = find_block(NULL, NULL, NULL, "/overlay");
1411
1412         if (!m || !m->extroot)
1413         {
1414                 ULOG_INFO("extroot: not configured\n");
1415                 return -1;
1416         }
1417
1418         /* Find block device pointed by the mount config */
1419         pr = find_block_info(m->uuid, m->label, m->device);
1420
1421         if (!pr && delay_root){
1422                 ULOG_INFO("extroot: device not present, retrying in %u seconds\n", delay_root);
1423                 sleep(delay_root);
1424                 make_devs();
1425                 cache_load(0);
1426                 pr = find_block_info(m->uuid, m->label, m->device);
1427         }
1428         if (pr) {
1429                 if (strncmp(pr->type, "ext", 3) &&
1430                     strncmp(pr->type, "f2fs", 4) &&
1431                     strncmp(pr->type, "ubifs", 5)) {
1432                         ULOG_ERR("extroot: unsupported filesystem %s, try ext4, f2fs or ubifs\n", pr->type);
1433                         return -1;
1434                 }
1435
1436                 if (test_fs_support(pr->type)) {
1437                         ULOG_ERR("extroot: filesystem %s not supported by kernel\n", pr->type);
1438                         return -1;
1439                 }
1440
1441                 if (m->overlay)
1442                         path = overlay;
1443                 mkdir_p(path);
1444
1445                 if (check_fs)
1446                         check_filesystem(pr);
1447
1448                 err = mount(pr->dev, path, pr->type, m->flags,
1449                             (m->options) ? (m->options) : (""));
1450
1451                 if (err) {
1452                         ULOG_ERR("extroot: mounting %s (%s) on %s failed: %d (%s)\n",
1453                                  pr->dev, pr->type, path, errno, strerror(errno));
1454                 } else if (m->overlay) {
1455                         err = check_extroot(path);
1456                         if (err)
1457                                 umount(path);
1458                 }
1459         } else {
1460                 ULOG_ERR("extroot: cannot find device %s%s\n",
1461                          (m->uuid ? "with UUID " : (m->label ? "with label " : "")),
1462                          (m->uuid ? m->uuid : (m->label ? m->label : m->device)));
1463         }
1464
1465         return err;
1466 }
1467
1468 static int main_extroot(int argc, char **argv)
1469 {
1470         struct probe_info *pr;
1471         char blkdev_path[32] = { 0 };
1472         int err = -1;
1473 #ifdef UBIFS_EXTROOT
1474         libubi_t libubi;
1475 #endif
1476
1477         if (!getenv("PREINIT"))
1478                 return -1;
1479
1480         if (argc != 2) {
1481                 ULOG_ERR("Usage: block extroot\n");
1482                 return -1;
1483         }
1484
1485         make_devs();
1486         cache_load(1);
1487
1488         /* enable LOG_INFO messages */
1489         ulog_threshold(LOG_INFO);
1490
1491         /*
1492          * Look for "rootfs_data". We will want to mount it and check for
1493          * extroot configuration.
1494          */
1495
1496         /* Start with looking for MTD partition */
1497         find_block_mtd("\"rootfs_data\"", blkdev_path, sizeof(blkdev_path));
1498         if (blkdev_path[0]) {
1499                 pr = find_block_info(NULL, NULL, blkdev_path);
1500                 if (pr && !strcmp(pr->type, "jffs2")) {
1501                         char cfg[] = "/tmp/jffs_cfg";
1502
1503                         /*
1504                          * Mount MTD part and try extroot (using
1505                          * /etc/config/fstab from that partition)
1506                          */
1507                         mkdir_p(cfg);
1508                         if (!mount(blkdev_path, cfg, "jffs2", MS_NOATIME, NULL)) {
1509                                 err = mount_extroot(cfg);
1510                                 umount2(cfg, MNT_DETACH);
1511                         }
1512                         if (err < 0)
1513                                 rmdir("/tmp/overlay");
1514                         rmdir(cfg);
1515                         return err;
1516                 }
1517         }
1518
1519 #ifdef UBIFS_EXTROOT
1520         /* ... but it also could be an UBI volume */
1521         memset(blkdev_path, 0, sizeof(blkdev_path));
1522         libubi = libubi_open();
1523         find_block_ubi(libubi, "rootfs_data", blkdev_path, sizeof(blkdev_path));
1524         libubi_close(libubi);
1525         if (blkdev_path[0]) {
1526                 char cfg[] = "/tmp/ubifs_cfg";
1527
1528                 /* Mount volume and try extroot (using fstab from that vol) */
1529                 mkdir_p(cfg);
1530                 if (!mount(blkdev_path, cfg, "ubifs", MS_NOATIME, NULL)) {
1531                         err = mount_extroot(cfg);
1532                         umount2(cfg, MNT_DETACH);
1533                 }
1534                 if (err < 0)
1535                         rmdir("/tmp/overlay");
1536                 rmdir(cfg);
1537                 return err;
1538        }
1539 #endif
1540
1541         return mount_extroot(NULL);
1542 }
1543
1544 static int main_mount(int argc, char **argv)
1545 {
1546         struct probe_info *pr;
1547
1548         if (config_load(NULL))
1549                 return -1;
1550
1551         cache_load(1);
1552         list_for_each_entry(pr, &devices, list)
1553                 mount_device(pr, TYPE_DEV);
1554
1555         handle_swapfiles(true);
1556
1557         return 0;
1558 }
1559
1560 static int main_umount(int argc, char **argv)
1561 {
1562         struct probe_info *pr;
1563
1564         if (config_load(NULL))
1565                 return -1;
1566
1567         handle_swapfiles(false);
1568
1569         cache_load(0);
1570         list_for_each_entry(pr, &devices, list)
1571                 umount_device(pr);
1572
1573         return 0;
1574 }
1575
1576 static int main_detect(int argc, char **argv)
1577 {
1578         struct probe_info *pr;
1579
1580         cache_load(0);
1581         printf("config 'global'\n");
1582         printf("\toption\tanon_swap\t'0'\n");
1583         printf("\toption\tanon_mount\t'0'\n");
1584         printf("\toption\tauto_swap\t'1'\n");
1585         printf("\toption\tauto_mount\t'1'\n");
1586         printf("\toption\tdelay_root\t'5'\n");
1587         printf("\toption\tcheck_fs\t'0'\n\n");
1588         list_for_each_entry(pr, &devices, list)
1589                 print_block_uci(pr);
1590
1591         return 0;
1592 }
1593
1594 static int main_info(int argc, char **argv)
1595 {
1596         int i;
1597         struct probe_info *pr;
1598
1599         cache_load(1);
1600         if (argc == 2) {
1601                 list_for_each_entry(pr, &devices, list)
1602                         print_block_info(pr);
1603
1604                 return 0;
1605         };
1606
1607         for (i = 2; i < argc; i++) {
1608                 struct stat s;
1609
1610                 if (stat(argv[i], &s)) {
1611                         ULOG_ERR("failed to stat %s\n", argv[i]);
1612                         continue;
1613                 }
1614                 if (!S_ISBLK(s.st_mode) && !(S_ISCHR(s.st_mode) && major(s.st_rdev) == 250)) {
1615                         ULOG_ERR("%s is not a block device\n", argv[i]);
1616                         continue;
1617                 }
1618                 pr = find_block_info(NULL, NULL, argv[i]);
1619                 if (pr)
1620                         print_block_info(pr);
1621         }
1622
1623         return 0;
1624 }
1625
1626 static int swapon_usage(void)
1627 {
1628         fprintf(stderr, "Usage: swapon [-s] [-a] [[-p pri] DEVICE]\n\n"
1629                 "\tStart swapping on [DEVICE]\n"
1630                 " -a\tStart swapping on all swap devices\n"
1631                 " -p pri\tSet priority of swap device\n"
1632                 " -s\tShow summary\n");
1633         return -1;
1634 }
1635
1636 static int main_swapon(int argc, char **argv)
1637 {
1638         int ch;
1639         FILE *fp;
1640         char *lineptr;
1641         size_t s;
1642         struct probe_info *pr;
1643         int flags = 0;
1644         int pri;
1645         struct stat st;
1646         int err;
1647
1648         while ((ch = getopt(argc, argv, "ap:s")) != -1) {
1649                 switch(ch) {
1650                 case 's':
1651                         fp = fopen("/proc/swaps", "r");
1652                         lineptr = NULL;
1653
1654                         if (!fp) {
1655                                 ULOG_ERR("failed to open /proc/swaps\n");
1656                                 return -1;
1657                         }
1658                         while (getline(&lineptr, &s, fp) > 0)
1659                                 printf("%s", lineptr);
1660                         if (lineptr)
1661                                 free(lineptr);
1662                         fclose(fp);
1663                         return 0;
1664                 case 'a':
1665                         cache_load(0);
1666                         list_for_each_entry(pr, &devices, list) {
1667                                 if (strcmp(pr->type, "swap"))
1668                                         continue;
1669                                 if (swapon(pr->dev, 0))
1670                                         ULOG_ERR("failed to swapon %s\n", pr->dev);
1671                         }
1672                         return 0;
1673                 case 'p':
1674                         pri = atoi(optarg);
1675                         if (pri >= 0)
1676                                 flags = ((pri << SWAP_FLAG_PRIO_SHIFT) & SWAP_FLAG_PRIO_MASK) | SWAP_FLAG_PREFER;
1677                         break;
1678                 default:
1679                         return swapon_usage();
1680                 }
1681
1682         }
1683
1684         if (optind != (argc - 1))
1685                 return swapon_usage();
1686
1687         if (stat(argv[optind], &st) || (!S_ISBLK(st.st_mode) && !S_ISREG(st.st_mode))) {
1688                 ULOG_ERR("%s is not a block device or file\n", argv[optind]);
1689                 return -1;
1690         }
1691         err = swapon(argv[optind], flags);
1692         if (err) {
1693                 ULOG_ERR("failed to swapon %s (%d)\n", argv[optind], err);
1694                 return err;
1695         }
1696
1697         return 0;
1698 }
1699
1700 static int main_swapoff(int argc, char **argv)
1701 {
1702         if (argc != 2) {
1703                 ULOG_ERR("Usage: swapoff [-a] [DEVICE]\n\n"
1704                         "\tStop swapping on DEVICE\n"
1705                         " -a\tStop swapping on all swap devices\n");
1706                 return -1;
1707         }
1708
1709         if (!strcmp(argv[1], "-a")) {
1710                 FILE *fp = fopen("/proc/swaps", "r");
1711                 char line[256];
1712
1713                 if (!fp) {
1714                         ULOG_ERR("failed to open /proc/swaps\n");
1715                         return -1;
1716                 }
1717                 if (fgets(line, sizeof(line), fp))
1718                         while (fgets(line, sizeof(line), fp)) {
1719                                 char *end = strchr(line, ' ');
1720                                 int err;
1721
1722                                 if (!end)
1723                                         continue;
1724                                 *end = '\0';
1725                                 err = swapoff(line);
1726                                 if (err)
1727                                         ULOG_ERR("failed to swapoff %s (%d)\n", line, err);
1728                         }
1729                 fclose(fp);
1730         } else {
1731                 struct stat s;
1732                 int err;
1733
1734                 if (stat(argv[1], &s) || (!S_ISBLK(s.st_mode) && !S_ISREG(s.st_mode))) {
1735                         ULOG_ERR("%s is not a block device or file\n", argv[1]);
1736                         return -1;
1737                 }
1738                 err = swapoff(argv[1]);
1739                 if (err) {
1740                         ULOG_ERR("failed to swapoff %s (%d)\n", argv[1], err);
1741                         return err;
1742                 }
1743         }
1744
1745         return 0;
1746 }
1747
1748 int main(int argc, char **argv)
1749 {
1750         char *base = basename(*argv);
1751
1752         umask(0);
1753
1754         ulog_open(-1, -1, "block");
1755         ulog_threshold(LOG_NOTICE);
1756
1757         if (!strcmp(base, "swapon"))
1758                 return main_swapon(argc, argv);
1759
1760         if (!strcmp(base, "swapoff"))
1761                 return main_swapoff(argc, argv);
1762
1763         if ((argc > 1) && !strcmp(base, "block")) {
1764                 if (!strcmp(argv[1], "info"))
1765                         return main_info(argc, argv);
1766
1767                 if (!strcmp(argv[1], "detect"))
1768                         return main_detect(argc, argv);
1769
1770                 if (!strcmp(argv[1], "hotplug"))
1771                         return main_hotplug(argc, argv);
1772
1773                 if (!strcmp(argv[1], "autofs"))
1774                         return main_autofs(argc, argv);
1775
1776                 if (!strcmp(argv[1], "extroot"))
1777                         return main_extroot(argc, argv);
1778
1779                 if (!strcmp(argv[1], "mount"))
1780                         return main_mount(argc, argv);
1781
1782                 if (!strcmp(argv[1], "umount"))
1783                         return main_umount(argc, argv);
1784
1785                 if (!strcmp(argv[1], "remount")) {
1786                         int ret = main_umount(argc, argv);
1787
1788                         if (!ret)
1789                                 ret = main_mount(argc, argv);
1790                         return ret;
1791                 }
1792         }
1793
1794         ULOG_ERR("Usage: block <info|mount|umount|detect>\n");
1795
1796         return -1;
1797 }