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/nvme*");
 533         _cache_load("/dev/vd*");
 534         _cache_load("/dev/xvd*");
 535         _cache_load("/dev/mapper/*");
 536 }
 537
 538
 539 static int print_block_uci(struct probe_info *pr)
 540 {
 541         if (!strcmp(pr->type, "swap")) {
 542                 printf("config 'swap'\n");
 543         } else {
 544                 printf("config 'mount'\n");
 545                 printf("\toption\ttarget\t'/mnt/%s'\n", basename(pr->dev));
 546         }
 547         if (pr->uuid)
 548                 printf("\toption\tuuid\t'%s'\n", pr->uuid);
 549         else
 550                 printf("\toption\tdevice\t'%s'\n", pr->dev);
 551         printf("\toption\tenabled\t'0'\n\n");
 552
 553         return 0;
 554 }
 555
 556 static struct probe_info* find_block_info(char *uuid, char *label, char *path)
 557 {
 558         struct probe_info *pr = NULL;
 559
 560         if (uuid)
 561                 list_for_each_entry(pr, &devices, list)
 562                         if (pr->uuid && !strcasecmp(pr->uuid, uuid))
 563                                 return pr;
 564
 565         if (label)
 566                 list_for_each_entry(pr, &devices, list)
 567                         if (pr->label && !strcmp(pr->label, label))
 568                                 return pr;
 569
 570         if (path)
 571                 list_for_each_entry(pr, &devices, list)
 572                         if (pr->dev && !strcmp(basename(pr->dev), basename(path)))
 573                                 return pr;
 574
 575         return NULL;
 576 }
 577
 578 static char* find_mount_point(char *block)
 579 {
 580         FILE *fp = fopen("/proc/self/mountinfo", "r");
 581         static char line[256];
 582         int len = strlen(block);
 583         char *point = NULL, *pos, *tmp, *cpoint, *devname;
 584         struct stat s;
 585         int rstat;
 586         unsigned int minor, major;
 587
 588         if (!fp)
 589                 return NULL;
 590
 591         rstat = stat(block, &s);
 592
 593         while (fgets(line, sizeof(line), fp)) {
 594                 pos = strchr(line, ' ');
 595                 if (!pos)
 596                         continue;
 597
 598                 pos = strchr(pos + 1, ' ');
 599                 if (!pos)
 600                         continue;
 601
 602                 tmp = ++pos;
 603                 pos = strchr(pos, ':');
 604                 if (!pos)
 605                         continue;
 606
 607                 *pos = '\0';
 608                 major = atoi(tmp);
 609                 tmp = ++pos;
 610                 pos = strchr(pos, ' ');
 611                 if (!pos)
 612                         continue;
 613
 614                 *pos = '\0';
 615                 minor = atoi(tmp);
 616                 pos = strchr(pos + 1, ' ');
 617                 if (!pos)
 618                         continue;
 619                 tmp = ++pos;
 620
 621                 pos = strchr(pos, ' ');
 622                 if (!pos)
 623                         continue;
 624                 *pos = '\0';
 625                 cpoint = tmp;
 626
 627                 pos = strchr(pos + 1, ' ');
 628                 if (!pos)
 629                         continue;
 630
 631                 pos = strchr(pos + 1, ' ');
 632                 if (!pos)
 633                         continue;
 634
 635                 pos = strchr(pos + 1, ' ');
 636                 if (!pos)
 637                         continue;
 638
 639                 tmp = ++pos;
 640                 pos = strchr(pos, ' ');
 641                 if (!pos)
 642                         continue;
 643
 644                 *pos = '\0';
 645                 devname = tmp;
 646                 if (!strncmp(block, devname, len)) {
 647                         point = strdup(cpoint);
 648                         break;
 649                 }
 650
 651                 if (rstat)
 652                         continue;
 653
 654                 if (!S_ISBLK(s.st_mode))
 655                         continue;
 656
 657                 if (major == major(s.st_rdev) &&
 658                     minor == minor(s.st_rdev)) {
 659                         point = strdup(cpoint);
 660                         break;
 661                 }
 662         }
 663
 664         fclose(fp);
 665
 666         return point;
 667 }
 668
 669 static int print_block_info(struct probe_info *pr)
 670 {
 671         static char *mp;
 672
 673         mp = find_mount_point(pr->dev);
 674         printf("%s:", pr->dev);
 675         if (pr->uuid)
 676                 printf(" UUID=\"%s\"", pr->uuid);
 677
 678         if (pr->label)
 679                 printf(" LABEL=\"%s\"", pr->label);
 680
 681         if (pr->version)
 682                 printf(" VERSION=\"%s\"", pr->version);
 683
 684         if (mp) {
 685                 printf(" MOUNT=\"%s\"", mp);
 686                 free(mp);
 687         }
 688
 689         printf(" TYPE=\"%s\"\n", pr->type);
 690
 691         return 0;
 692 }
 693
 694 static void mkdir_p(char *dir)
 695 {
 696         char *l = strrchr(dir, '/');
 697
 698         if (l) {
 699                 *l = '\0';
 700                 mkdir_p(dir);
 701                 *l = '/';
 702                 mkdir(dir, 0755);
 703         }
 704 }
 705
 706 static void check_filesystem(struct probe_info *pr)
 707 {
 708         pid_t pid;
 709         struct stat statbuf;
 710         const char *e2fsck = "/usr/sbin/e2fsck";
 711         const char *f2fsck = "/usr/sbin/fsck.f2fs";
 712         const char *dosfsck = "/usr/sbin/dosfsck";
 713         const char *btrfsck = "/usr/bin/btrfsck";
 714         const char *ntfsck = "/usr/bin/ntfsfix";
 715         const char *ckfs;
 716
 717         /* UBIFS does not need stuff like fsck */
 718         if (!strncmp(pr->type, "ubifs", 5))
 719                 return;
 720
 721         if (!strncmp(pr->type, "vfat", 4)) {
 722                 ckfs = dosfsck;
 723         } else if (!strncmp(pr->type, "f2fs", 4)) {
 724                 ckfs = f2fsck;
 725         } else if (!strncmp(pr->type, "ext", 3)) {
 726                 ckfs = e2fsck;
 727         } else if (!strncmp(pr->type, "btrfs", 5)) {
 728                 ckfs = btrfsck;
 729         } else if (!strncmp(pr->type, "ntfs", 4)) {
 730                 ckfs = ntfsck;
 731         } else {
 732                 ULOG_ERR("check_filesystem: %s is not supported\n", pr->type);
 733                 return;
 734         }
 735
 736         if (stat(ckfs, &statbuf) < 0) {
 737                 ULOG_ERR("check_filesystem: %s not found\n", ckfs);
 738                 return;
 739         }
 740
 741         pid = fork();
 742         if (!pid) {
 743                 if(!strncmp(pr->type, "f2fs", 4)) {
 744                         execl(ckfs, ckfs, "-f", pr->dev, NULL);
 745                         exit(-1);
 746                 } else if(!strncmp(pr->type, "btrfs", 5)) {
 747                         execl(ckfs, ckfs, "--repair", pr->dev, NULL);
 748                         exit(-1);
 749                 } else if(!strncmp(pr->type, "ntfs", 4)) {
 750                         execl(ckfs, ckfs, "-b", pr->dev, NULL);
 751                         exit(-1);
 752                 } else {
 753                         execl(ckfs, ckfs, "-p", pr->dev, NULL);
 754                         exit(-1);
 755                 }
 756         } else if (pid > 0) {
 757                 int status;
 758
 759                 waitpid(pid, &status, 0);
 760                 if (WEXITSTATUS(status))
 761                         ULOG_ERR("check_filesystem: %s returned %d\n", ckfs, WEXITSTATUS(status));
 762         }
 763 }
 764
 765 static void handle_swapfiles(bool on)
 766 {
 767         struct stat s;
 768         struct mount *m;
 769         struct probe_info *pr;
 770
 771         vlist_for_each_element(&mounts, m, node)
 772         {
 773                 if (m->type != TYPE_SWAP || !m->target)
 774                         continue;
 775
 776                 if (stat(m->target, &s) || !S_ISREG(s.st_mode))
 777                         continue;
 778
 779                 pr = _probe_path(m->target);
 780
 781                 if (!pr)
 782                         continue;
 783
 784                 if (!strcmp(pr->type, "swap")) {
 785                         if (on)
 786                                 swapon(pr->dev, m->prio);
 787                         else
 788                                 swapoff(pr->dev);
 789                 }
 790
 791                 free(pr);
 792         }
 793 }
 794
 795 static void to_devnull(int fd)
 796 {
 797         int devnull = open("/dev/null", fd ? O_WRONLY : O_RDONLY);
 798
 799         if (devnull >= 0)
 800                 dup2(devnull, fd);
 801
 802         if (devnull > STDERR_FILENO)
 803                 close(devnull);
 804 }
 805
 806 static int exec_mount(const char *source, const char *target,
 807                       const char *fstype, const char *options)
 808 {
 809         pid_t pid;
 810         struct stat s;
 811         FILE *mount_fd;
 812         int err, status, pfds[2];
 813         char errmsg[128], cmd[sizeof("/sbin/mount.XXXXXXXXXXXXXXXX\0")];
 814
 815         snprintf(cmd, sizeof(cmd), "/sbin/mount.%s", fstype);
 816
 817         if (stat(cmd, &s) < 0 || !S_ISREG(s.st_mode) || !(s.st_mode & S_IXUSR)) {
 818                 ULOG_ERR("No \"mount.%s\" utility available\n", fstype);
 819                 return -1;
 820         }
 821
 822         if (pipe(pfds) < 0)
 823                 return -1;
 824
 825         fcntl(pfds[0], F_SETFD, fcntl(pfds[0], F_GETFD) | FD_CLOEXEC);
 826         fcntl(pfds[1], F_SETFD, fcntl(pfds[1], F_GETFD) | FD_CLOEXEC);
 827
 828         pid = vfork();
 829
 830         switch (pid) {
 831         case -1:
 832                 close(pfds[0]);
 833                 close(pfds[1]);
 834
 835                 return -1;
 836
 837         case 0:
 838                 to_devnull(STDIN_FILENO);
 839                 to_devnull(STDOUT_FILENO);
 840
 841                 dup2(pfds[1], STDERR_FILENO);
 842                 close(pfds[0]);
 843                 close(pfds[1]);
 844
 845                 if (options && *options)
 846                         execl(cmd, cmd, "-o", options, source, target, NULL);
 847                 else
 848                         execl(cmd, cmd, source, target, NULL);
 849
 850                 return -1;
 851
 852         default:
 853                 close(pfds[1]);
 854
 855                 mount_fd = fdopen(pfds[0], "r");
 856
 857                 while (fgets(errmsg, sizeof(errmsg), mount_fd))
 858                         ULOG_ERR("mount.%s: %s", fstype, errmsg);
 859
 860                 fclose(mount_fd);
 861
 862                 err = waitpid(pid, &status, 0);
 863
 864                 if (err != -1) {
 865                         if (status != 0) {
 866                                 ULOG_ERR("mount.%s: failed with status %d\n", fstype, status);
 867                                 errno = EINVAL;
 868                                 err = -1;
 869                         } else {
 870                                 errno = 0;
 871                                 err = 0;
 872                         }
 873                 }
 874
 875                 break;
 876         }
 877
 878         return err;
 879 }
 880
 881 static int handle_mount(const char *source, const char *target,
 882                         const char *fstype, struct mount *m)
 883 {
 884         int i, err;
 885         size_t mount_opts_len;
 886         char *mount_opts = NULL, *ptr;
 887
 888         err = mount(source, target, fstype, m ? m->flags : 0,
 889                     (m && m->options) ? m->options : "");
 890
 891         /* Requested file system type is not available in kernel,
 892            attempt to call mount helper. */
 893         if (err == -1 && errno == ENODEV) {
 894                 if (m) {
 895                         /* Convert mount flags back into string representation,
 896                            first calculate needed length of string buffer... */
 897                         mount_opts_len = 1 + (m->options ? strlen(m->options) : 0);
 898
 899                         for (i = 0; i < ARRAY_SIZE(mount_flags); i++)
 900                                 if ((mount_flags[i].flag > 0) &&
 901                                     (mount_flags[i].flag < INT_MAX) &&
 902                                     (m->flags & (uint32_t)mount_flags[i].flag))
 903                                         mount_opts_len += strlen(mount_flags[i].name) + 1;
 904
 905                         /* ... then now allocate and fill it ... */
 906                         ptr = mount_opts = calloc(1, mount_opts_len);
 907
 908                         if (!ptr) {
 909                                 errno = ENOMEM;
 910                                 return -1;
 911                         }
 912
 913                         if (m->options)
 914                                 ptr += sprintf(ptr, "%s,", m->options);
 915
 916                         for (i = 0; i < ARRAY_SIZE(mount_flags); i++)
 917                                 if ((mount_flags[i].flag > 0) &&
 918                                     (mount_flags[i].flag < INT_MAX) &&
 919                                     (m->flags & (uint32_t)mount_flags[i].flag))
 920                                         ptr += sprintf(ptr, "%s,", mount_flags[i].name);
 921
 922                         mount_opts[mount_opts_len - 1] = 0;
 923                 }
 924
 925                 /* ... and now finally invoke the external mount program */
 926                 err = exec_mount(source, target, fstype, mount_opts);
 927         }
 928
 929         return err;
 930 }
 931
 932 static void blockd_notify(char *device, struct mount *m, struct probe_info *pr)
 933 {
 934         struct ubus_context *ctx = ubus_connect(NULL);
 935         uint32_t id;
 936
 937         if (!ctx)
 938                 return;
 939
 940         if (!ubus_lookup_id(ctx, "block", &id)) {
 941                 struct blob_buf buf = { 0 };
 942                 char *d = strrchr(device, '/');
 943
 944                 if (d)
 945                         d++;
 946                 else
 947                         d = device;
 948
 949                 blob_buf_init(&buf, 0);
 950
 951                 if (m) {
 952
 953                         blobmsg_add_string(&buf, "device", d);
 954                         if (m->uuid)
 955                                 blobmsg_add_string(&buf, "uuid", m->uuid);
 956                         if (m->label)
 957                                 blobmsg_add_string(&buf, "label", m->label);
 958                         if (m->target)
 959                                 blobmsg_add_string(&buf, "target", m->target);
 960                         if (m->options)
 961                                 blobmsg_add_string(&buf, "options", m->options);
 962                         if (m->autofs)
 963                                 blobmsg_add_u32(&buf, "autofs", m->autofs);
 964                         if (pr->type)
 965                                 blobmsg_add_string(&buf, "type", pr->type);
 966                         if (pr->version)
 967                                 blobmsg_add_string(&buf, "version", pr->version);
 968                 } else if (pr) {
 969                         blobmsg_add_string(&buf, "device", d);
 970                         if (pr->uuid)
 971                                 blobmsg_add_string(&buf, "uuid", pr->uuid);
 972                         if (pr->label)
 973                                 blobmsg_add_string(&buf, "label", pr->label);
 974                         if (pr->type)
 975                                 blobmsg_add_string(&buf, "type", pr->type);
 976                         if (pr->version)
 977                                 blobmsg_add_string(&buf, "version", pr->version);
 978                         blobmsg_add_u32(&buf, "anon", 1);
 979                 } else {
 980                         blobmsg_add_string(&buf, "device", d);
 981                         blobmsg_add_u32(&buf, "remove", 1);
 982                 }
 983
 984                 ubus_invoke(ctx, id, "hotplug", buf.head, NULL, NULL, 3000);
 985         }
 986
 987         ubus_free(ctx);
 988 }
 989
 990 static int mount_device(struct probe_info *pr, int type)
 991 {
 992         struct mount *m;
 993         char *device;
 994         char *mp;
 995
 996         if (!pr)
 997                 return -1;
 998
 999         device = basename(pr->dev);
1000
1001         if (!strcmp(pr->type, "swap")) {
1002                 if ((type == TYPE_HOTPLUG) && !auto_swap)
1003                         return -1;
1004                 m = find_swap(pr->uuid, pr->label, device);
1005                 if (m || anon_swap)
1006                         swapon(pr->dev, (m) ? (m->prio) : (0));
1007
1008                 return 0;
1009         }
1010
1011         mp = find_mount_point(pr->dev);
1012         if (mp && (type != TYPE_HOTPLUG)) {
1013                 ULOG_ERR("%s is already mounted on %s\n", pr->dev, mp);
1014                 free(mp);
1015                 return -1;
1016         }
1017
1018         m = find_block(pr->uuid, pr->label, device, NULL);
1019         if (m && m->extroot)
1020                 return -1;
1021
1022         if (m) switch (type) {
1023         case TYPE_HOTPLUG:
1024                 blockd_notify(device, m, pr);
1025                 if (m->autofs)
1026                         return 0;
1027                 if (!auto_mount)
1028                         return -1;
1029                 break;
1030         case TYPE_AUTOFS:
1031                 if (!m->autofs)
1032                         return -1;
1033                 break;
1034         case TYPE_DEV:
1035                 if (m->autofs)
1036                         return -1;
1037                 break;
1038         } else if (type == TYPE_HOTPLUG) {
1039                 blockd_notify(device, NULL, pr);
1040         }
1041
1042         if (m) {
1043                 char *target = m->target;
1044                 char _target[32];
1045                 int err = 0;
1046
1047                 if (m->autofs) {
1048                         snprintf(_target, sizeof(_target), "/tmp/run/blockd/%s", device);
1049                         target = _target;
1050                 }
1051                 if (!target) {
1052                         snprintf(_target, sizeof(_target), "/mnt/%s", device);
1053                         target = _target;
1054                 }
1055                 mkdir_p(target);
1056
1057                 if (check_fs)
1058                         check_filesystem(pr);
1059
1060                 err = handle_mount(pr->dev, target, pr->type, m);
1061                 if (err)
1062                         ULOG_ERR("mounting %s (%s) as %s failed (%d) - %m\n",
1063                                  pr->dev, pr->type, target, errno);
1064                 else
1065                         handle_swapfiles(true);
1066                 return err;
1067         }
1068
1069         if (anon_mount) {
1070                 char target[32];
1071                 int err = 0;
1072
1073                 snprintf(target, sizeof(target), "/mnt/%s", device);
1074                 mkdir_p(target);
1075
1076                 if (check_fs)
1077                         check_filesystem(pr);
1078
1079                 err = handle_mount(pr->dev, target, pr->type, NULL);
1080                 if (err)
1081                         ULOG_ERR("mounting %s (%s) as %s failed (%d) - %m\n",
1082                                  pr->dev, pr->type, target, errno);
1083                 else
1084                         handle_swapfiles(true);
1085                 return err;
1086         }
1087
1088         return 0;
1089 }
1090
1091 static int umount_device(struct probe_info *pr)
1092 {
1093         struct mount *m;
1094         char *device = basename(pr->dev);
1095         char *mp;
1096         int err;
1097
1098         if (!pr)
1099                 return -1;
1100
1101         if (!strcmp(pr->type, "swap"))
1102                 return -1;
1103
1104         mp = find_mount_point(pr->dev);
1105         if (!mp)
1106                 return -1;
1107
1108         m = find_block(pr->uuid, pr->label, device, NULL);
1109         if (m && m->extroot)
1110                 return -1;
1111
1112         err = umount2(mp, MNT_DETACH);
1113         if (err)
1114                 ULOG_ERR("unmounting %s (%s)  failed (%d) - %m\n",
1115                          pr->dev, mp, errno);
1116         else
1117                 ULOG_INFO("unmounted %s (%s)\n",
1118                           pr->dev, mp);
1119
1120         free(mp);
1121         return err;
1122 }
1123
1124 static int mount_action(char *action, char *device, int type)
1125 {
1126         char path[32];
1127         char *mount_point;
1128
1129         if (!action || !device)
1130                 return -1;
1131         snprintf(path, sizeof(path), "/dev/%s", device);
1132
1133         if (!strcmp(action, "remove")) {
1134                 int err = 0;
1135
1136                 if (type == TYPE_HOTPLUG)
1137                         blockd_notify(device, NULL, NULL);
1138
1139                 mount_point = find_mount_point(path);
1140                 if (mount_point)
1141                         err = umount2(mount_point, MNT_DETACH);
1142
1143                 if (err)
1144                         ULOG_ERR("umount of %s failed (%d) - %m\n",
1145                                  mount_point, errno);
1146
1147                 free(mount_point);
1148                 return 0;
1149         } else if (strcmp(action, "add")) {
1150                 ULOG_ERR("Unkown action %s\n", action);
1151
1152                 return -1;
1153         }
1154
1155         if (config_load(NULL))
1156                 return -1;
1157         cache_load(0);
1158
1159         return mount_device(find_block_info(NULL, NULL, path), type);
1160 }
1161
1162 static int main_hotplug(int argc, char **argv)
1163 {
1164         return mount_action(getenv("ACTION"), getenv("DEVNAME"), TYPE_HOTPLUG);
1165 }
1166
1167 static int main_autofs(int argc, char **argv)
1168 {
1169         if (argc < 3)
1170                 return -1;
1171
1172         if (!strcmp(argv[2], "start")) {
1173                 struct probe_info *pr;
1174
1175                 if (config_load(NULL))
1176                         return -1;
1177
1178                 cache_load(0);
1179                 list_for_each_entry(pr, &devices, list) {
1180                         struct mount *m = find_block(pr->uuid, pr->label, NULL, NULL);
1181
1182                         if (m && m->autofs)
1183                                 mount_device(pr, TYPE_HOTPLUG);
1184                         else
1185                                 blockd_notify(pr->dev, m, pr);
1186                 }
1187                 return 0;
1188         }
1189         return mount_action(argv[2], argv[3], TYPE_AUTOFS);
1190 }
1191
1192 static int find_block_mtd(char *name, char *part, int plen)
1193 {
1194         FILE *fp = fopen("/proc/mtd", "r");
1195         static char line[256];
1196         char *index = NULL;
1197
1198         if(!fp)
1199                 return -1;
1200
1201         while (!index && fgets(line, sizeof(line), fp)) {
1202                 if (strstr(line, name)) {
1203                         char *eol = strstr(line, ":");
1204
1205                         if (!eol)
1206                                 continue;
1207
1208                         *eol = '\0';
1209                         index = &line[3];
1210                 }
1211         }
1212
1213         fclose(fp);
1214
1215         if (!index)
1216                 return -1;
1217
1218         snprintf(part, plen, "/dev/mtdblock%s", index);
1219
1220         return 0;
1221 }
1222
1223 #ifdef UBIFS_EXTROOT
1224 static int find_ubi_vol(libubi_t libubi, char *name, int *dev_num, int *vol_id)
1225 {
1226         int dev = 0;
1227
1228         while (ubi_dev_present(libubi, dev))
1229         {
1230                 struct ubi_dev_info dev_info;
1231                 struct ubi_vol_info vol_info;
1232
1233                 if (ubi_get_dev_info1(libubi, dev++, &dev_info))
1234                         continue;
1235                 if (ubi_get_vol_info1_nm(libubi, dev_info.dev_num, name, &vol_info))
1236                         continue;
1237
1238                 *dev_num = dev_info.dev_num;
1239                 *vol_id = vol_info.vol_id;
1240
1241                 return 0;
1242         }
1243
1244         return -1;
1245 }
1246
1247 static int find_block_ubi(libubi_t libubi, char *name, char *part, int plen)
1248 {
1249         int dev_num;
1250         int vol_id;
1251         int err = -1;
1252
1253         err = find_ubi_vol(libubi, name, &dev_num, &vol_id);
1254         if (!err)
1255                 snprintf(part, plen, "/dev/ubi%d_%d", dev_num, vol_id);
1256
1257         return err;
1258 }
1259
1260 static int find_block_ubi_RO(libubi_t libubi, char *name, char *part, int plen)
1261 {
1262         int dev_num;
1263         int vol_id;
1264         int err = -1;
1265
1266         err = find_ubi_vol(libubi, name, &dev_num, &vol_id);
1267         if (!err)
1268                 snprintf(part, plen, "/dev/ubiblock%d_%d", dev_num, vol_id);
1269
1270         return err;
1271 }
1272
1273 #else
1274
1275 static int find_root_dev(char *buf, int len)
1276 {
1277         DIR *d;
1278         dev_t root;
1279         struct stat s;
1280         struct dirent *e;
1281
1282         if (stat("/", &s))
1283                 return -1;
1284
1285         if (!(d = opendir("/dev")))
1286                 return -1;
1287
1288         root = s.st_dev;
1289
1290         while ((e = readdir(d)) != NULL) {
1291                 snprintf(buf, len, "/dev/%s", e->d_name);
1292
1293                 if (stat(buf, &s) || s.st_rdev != root)
1294                         continue;
1295
1296                 closedir(d);
1297                 return 0;
1298         }
1299
1300         closedir(d);
1301         return -1;
1302 }
1303
1304 #endif
1305
1306 static int test_fs_support(const char *name)
1307 {
1308         char line[128], *p;
1309         int rv = -1;
1310         FILE *f;
1311
1312         if ((f = fopen("/proc/filesystems", "r")) != NULL) {
1313                 while (fgets(line, sizeof(line), f)) {
1314                         p = strtok(line, "\t\n");
1315
1316                         if (p && !strcmp(p, "nodev"))
1317                                 p = strtok(NULL, "\t\n");
1318
1319                         if (p && !strcmp(p, name)) {
1320                                 rv = 0;
1321                                 break;
1322                         }
1323                 }
1324                 fclose(f);
1325         }
1326
1327         return rv;
1328 }
1329
1330 static int check_extroot(char *path)
1331 {
1332         struct probe_info *pr = NULL;
1333         char devpath[32];
1334
1335 #ifdef UBIFS_EXTROOT
1336         if (find_block_mtd("\"rootfs\"", devpath, sizeof(devpath))) {
1337                 int err = -1;
1338                 libubi_t libubi;
1339
1340                 libubi = libubi_open();
1341                 err = find_block_ubi_RO(libubi, "rootfs", devpath, sizeof(devpath));
1342                 libubi_close(libubi);
1343                 if (err)
1344                         return -1;
1345         }
1346 #else
1347         if (find_block_mtd("\"rootfs\"", devpath, sizeof(devpath))) {
1348                 if (find_root_dev(devpath, sizeof(devpath))) {
1349                         ULOG_ERR("extroot: unable to determine root device\n");
1350                         return -1;
1351                 }
1352         }
1353 #endif
1354
1355         list_for_each_entry(pr, &devices, list) {
1356                 if (!strcmp(pr->dev, devpath)) {
1357                         struct stat s;
1358                         FILE *fp = NULL;
1359                         char tag[64];
1360                         char uuid[64] = { 0 };
1361
1362                         snprintf(tag, sizeof(tag), "%s/etc", path);
1363                         if (stat(tag, &s))
1364                                 mkdir_p(tag);
1365
1366                         snprintf(tag, sizeof(tag), "%s/etc/.extroot-uuid", path);
1367                         if (stat(tag, &s)) {
1368                                 fp = fopen(tag, "w+");
1369                                 if (!fp) {
1370                                         ULOG_ERR("extroot: failed to write UUID to %s: %d (%m)\n",
1371                                                  tag, errno);
1372                                         /* return 0 to continue boot regardless of error */
1373                                         return 0;
1374                                 }
1375                                 fputs(pr->uuid, fp);
1376                                 fclose(fp);
1377                                 return 0;
1378                         }
1379
1380                         fp = fopen(tag, "r");
1381                         if (!fp) {
1382                                 ULOG_ERR("extroot: failed to read UUID from %s: %d (%m)\n",
1383                                          tag, errno);
1384                                 return -1;
1385                         }
1386
1387                         if (!fgets(uuid, sizeof(uuid), fp))
1388                                 ULOG_ERR("extroot: failed to read UUID from %s: %d (%m)\n",
1389                                          tag, errno);
1390                         fclose(fp);
1391
1392                         if (*uuid && !strcasecmp(uuid, pr->uuid))
1393                                 return 0;
1394
1395                         ULOG_ERR("extroot: UUID mismatch (root: %s, %s: %s)\n",
1396                                  pr->uuid, basename(path), uuid);
1397                         return -1;
1398                 }
1399         }
1400
1401         ULOG_ERR("extroot: unable to lookup root device %s\n", devpath);
1402         return -1;
1403 }
1404
1405 /*
1406  * Read info about extroot from UCI (using prefix) and mount it.
1407  */
1408 static int mount_extroot(char *cfg)
1409 {
1410         char overlay[] = "/tmp/extroot/overlay";
1411         char mnt[] = "/tmp/extroot/mnt";
1412         char *path = mnt;
1413         struct probe_info *pr;
1414         struct mount *m;
1415         int err = -1;
1416
1417         /* Load @cfg/etc/config/fstab */
1418         if (config_load(cfg))
1419                 return -2;
1420
1421         /* See if there is extroot-specific mount config */
1422         m = find_block(NULL, NULL, NULL, "/");
1423         if (!m)
1424                 m = find_block(NULL, NULL, NULL, "/overlay");
1425
1426         if (!m || !m->extroot)
1427         {
1428                 ULOG_INFO("extroot: not configured\n");
1429                 return -1;
1430         }
1431
1432         /* Find block device pointed by the mount config */
1433         pr = find_block_info(m->uuid, m->label, m->device);
1434
1435         if (!pr && delay_root){
1436                 ULOG_INFO("extroot: device not present, retrying in %u seconds\n", delay_root);
1437                 sleep(delay_root);
1438                 make_devs();
1439                 cache_load(0);
1440                 pr = find_block_info(m->uuid, m->label, m->device);
1441         }
1442         if (pr) {
1443                 if (strncmp(pr->type, "ext", 3) &&
1444                     strncmp(pr->type, "f2fs", 4) &&
1445                     strncmp(pr->type, "btrfs", 5) &&
1446                     strncmp(pr->type, "ntfs", 4) &&
1447                     strncmp(pr->type, "ubifs", 5)) {
1448                         ULOG_ERR("extroot: unsupported filesystem %s, try ext4, f2fs, btrfs, ntfs or ubifs\n", pr->type);
1449                         return -1;
1450                 }
1451
1452                 if (test_fs_support(pr->type)) {
1453                         ULOG_ERR("extroot: filesystem %s not supported by kernel\n", pr->type);
1454                         return -1;
1455                 }
1456
1457                 if (m->overlay)
1458                         path = overlay;
1459                 mkdir_p(path);
1460
1461                 if (check_fs)
1462                         check_filesystem(pr);
1463
1464                 err = mount(pr->dev, path, pr->type, m->flags,
1465                             (m->options) ? (m->options) : (""));
1466
1467                 if (err) {
1468                         ULOG_ERR("extroot: mounting %s (%s) on %s failed: %d (%m)\n",
1469                                  pr->dev, pr->type, path, errno);
1470                 } else if (m->overlay) {
1471                         err = check_extroot(path);
1472                         if (err)
1473                                 umount(path);
1474                 }
1475         } else {
1476                 ULOG_ERR("extroot: cannot find device %s%s\n",
1477                          (m->uuid ? "with UUID " : (m->label ? "with label " : "")),
1478                          (m->uuid ? m->uuid : (m->label ? m->label : m->device)));
1479         }
1480
1481         return err;
1482 }
1483
1484 static int main_extroot(int argc, char **argv)
1485 {
1486         struct probe_info *pr;
1487         char blkdev_path[32] = { 0 };
1488         int err = -1;
1489 #ifdef UBIFS_EXTROOT
1490         libubi_t libubi;
1491 #endif
1492
1493         if (!getenv("PREINIT"))
1494                 return -1;
1495
1496         if (argc != 2) {
1497                 ULOG_ERR("Usage: block extroot\n");
1498                 return -1;
1499         }
1500
1501         make_devs();
1502         cache_load(1);
1503
1504         /* enable LOG_INFO messages */
1505         ulog_threshold(LOG_INFO);
1506
1507         /*
1508          * Look for "rootfs_data". We will want to mount it and check for
1509          * extroot configuration.
1510          */
1511
1512         /* Start with looking for MTD partition */
1513         find_block_mtd("\"rootfs_data\"", blkdev_path, sizeof(blkdev_path));
1514         if (blkdev_path[0]) {
1515                 pr = find_block_info(NULL, NULL, blkdev_path);
1516                 if (pr && !strcmp(pr->type, "jffs2")) {
1517                         char cfg[] = "/tmp/jffs_cfg";
1518
1519                         /*
1520                          * Mount MTD part and try extroot (using
1521                          * /etc/config/fstab from that partition)
1522                          */
1523                         mkdir_p(cfg);
1524                         if (!mount(blkdev_path, cfg, "jffs2", MS_NOATIME, NULL)) {
1525                                 err = mount_extroot(cfg);
1526                                 umount2(cfg, MNT_DETACH);
1527                         }
1528                         if (err < 0)
1529                                 rmdir("/tmp/overlay");
1530                         rmdir(cfg);
1531                         return err;
1532                 }
1533         }
1534
1535 #ifdef UBIFS_EXTROOT
1536         /* ... but it also could be an UBI volume */
1537         memset(blkdev_path, 0, sizeof(blkdev_path));
1538         libubi = libubi_open();
1539         find_block_ubi(libubi, "rootfs_data", blkdev_path, sizeof(blkdev_path));
1540         libubi_close(libubi);
1541         if (blkdev_path[0]) {
1542                 char cfg[] = "/tmp/ubifs_cfg";
1543
1544                 /* Mount volume and try extroot (using fstab from that vol) */
1545                 mkdir_p(cfg);
1546                 if (!mount(blkdev_path, cfg, "ubifs", MS_NOATIME, NULL)) {
1547                         err = mount_extroot(cfg);
1548                         umount2(cfg, MNT_DETACH);
1549                 }
1550                 if (err < 0)
1551                         rmdir("/tmp/overlay");
1552                 rmdir(cfg);
1553                 return err;
1554        }
1555 #endif
1556
1557         return mount_extroot(NULL);
1558 }
1559
1560 static int main_mount(int argc, char **argv)
1561 {
1562         struct probe_info *pr;
1563
1564         if (config_load(NULL))
1565                 return -1;
1566
1567         cache_load(1);
1568         list_for_each_entry(pr, &devices, list)
1569                 mount_device(pr, TYPE_DEV);
1570
1571         handle_swapfiles(true);
1572
1573         return 0;
1574 }
1575
1576 static int main_umount(int argc, char **argv)
1577 {
1578         struct probe_info *pr;
1579
1580         if (config_load(NULL))
1581                 return -1;
1582
1583         handle_swapfiles(false);
1584
1585         cache_load(0);
1586         list_for_each_entry(pr, &devices, list)
1587                 umount_device(pr);
1588
1589         return 0;
1590 }
1591
1592 static int main_detect(int argc, char **argv)
1593 {
1594         struct probe_info *pr;
1595
1596         cache_load(0);
1597         printf("config 'global'\n");
1598         printf("\toption\tanon_swap\t'0'\n");
1599         printf("\toption\tanon_mount\t'0'\n");
1600         printf("\toption\tauto_swap\t'1'\n");
1601         printf("\toption\tauto_mount\t'1'\n");
1602         printf("\toption\tdelay_root\t'5'\n");
1603         printf("\toption\tcheck_fs\t'0'\n\n");
1604         list_for_each_entry(pr, &devices, list)
1605                 print_block_uci(pr);
1606
1607         return 0;
1608 }
1609
1610 static int main_info(int argc, char **argv)
1611 {
1612         int i;
1613         struct probe_info *pr;
1614
1615         cache_load(1);
1616         if (argc == 2) {
1617                 list_for_each_entry(pr, &devices, list)
1618                         print_block_info(pr);
1619
1620                 return 0;
1621         };
1622
1623         for (i = 2; i < argc; i++) {
1624                 struct stat s;
1625
1626                 if (stat(argv[i], &s)) {
1627                         ULOG_ERR("failed to stat %s\n", argv[i]);
1628                         continue;
1629                 }
1630                 if (!S_ISBLK(s.st_mode) && !(S_ISCHR(s.st_mode) && major(s.st_rdev) == 250)) {
1631                         ULOG_ERR("%s is not a block device\n", argv[i]);
1632                         continue;
1633                 }
1634                 pr = find_block_info(NULL, NULL, argv[i]);
1635                 if (pr)
1636                         print_block_info(pr);
1637         }
1638
1639         return 0;
1640 }
1641
1642 static int swapon_usage(void)
1643 {
1644         fprintf(stderr, "Usage: swapon [-s] [-a] [[-p pri] DEVICE]\n\n"
1645                 "\tStart swapping on [DEVICE]\n"
1646                 " -a\tStart swapping on all swap devices\n"
1647                 " -p pri\tSet priority of swap device\n"
1648                 " -s\tShow summary\n");
1649         return -1;
1650 }
1651
1652 static int main_swapon(int argc, char **argv)
1653 {
1654         int ch;
1655         FILE *fp;
1656         char *lineptr;
1657         size_t s;
1658         struct probe_info *pr;
1659         int flags = 0;
1660         int pri;
1661         struct stat st;
1662         int err;
1663
1664         while ((ch = getopt(argc, argv, "ap:s")) != -1) {
1665                 switch(ch) {
1666                 case 's':
1667                         fp = fopen("/proc/swaps", "r");
1668                         lineptr = NULL;
1669
1670                         if (!fp) {
1671                                 ULOG_ERR("failed to open /proc/swaps\n");
1672                                 return -1;
1673                         }
1674                         while (getline(&lineptr, &s, fp) > 0)
1675                                 printf("%s", lineptr);
1676                         if (lineptr)
1677                                 free(lineptr);
1678                         fclose(fp);
1679                         return 0;
1680                 case 'a':
1681                         cache_load(0);
1682                         list_for_each_entry(pr, &devices, list) {
1683                                 if (strcmp(pr->type, "swap"))
1684                                         continue;
1685                                 if (swapon(pr->dev, 0))
1686                                         ULOG_ERR("failed to swapon %s\n", pr->dev);
1687                         }
1688                         return 0;
1689                 case 'p':
1690                         pri = atoi(optarg);
1691                         if (pri >= 0)
1692                                 flags = ((pri << SWAP_FLAG_PRIO_SHIFT) & SWAP_FLAG_PRIO_MASK) | SWAP_FLAG_PREFER;
1693                         break;
1694                 default:
1695                         return swapon_usage();
1696                 }
1697
1698         }
1699
1700         if (optind != (argc - 1))
1701                 return swapon_usage();
1702
1703         if (stat(argv[optind], &st) || (!S_ISBLK(st.st_mode) && !S_ISREG(st.st_mode))) {
1704                 ULOG_ERR("%s is not a block device or file\n", argv[optind]);
1705                 return -1;
1706         }
1707         err = swapon(argv[optind], flags);
1708         if (err) {
1709                 ULOG_ERR("failed to swapon %s (%d)\n", argv[optind], err);
1710                 return err;
1711         }
1712
1713         return 0;
1714 }
1715
1716 static int main_swapoff(int argc, char **argv)
1717 {
1718         if (argc != 2) {
1719                 ULOG_ERR("Usage: swapoff [-a] [DEVICE]\n\n"
1720                         "\tStop swapping on DEVICE\n"
1721                         " -a\tStop swapping on all swap devices\n");
1722                 return -1;
1723         }
1724
1725         if (!strcmp(argv[1], "-a")) {
1726                 FILE *fp = fopen("/proc/swaps", "r");
1727                 char line[256];
1728
1729                 if (!fp) {
1730                         ULOG_ERR("failed to open /proc/swaps\n");
1731                         return -1;
1732                 }
1733                 if (fgets(line, sizeof(line), fp))
1734                         while (fgets(line, sizeof(line), fp)) {
1735                                 char *end = strchr(line, ' ');
1736                                 int err;
1737
1738                                 if (!end)
1739                                         continue;
1740                                 *end = '\0';
1741                                 err = swapoff(line);
1742                                 if (err)
1743                                         ULOG_ERR("failed to swapoff %s (%d)\n", line, err);
1744                         }
1745                 fclose(fp);
1746         } else {
1747                 struct stat s;
1748                 int err;
1749
1750                 if (stat(argv[1], &s) || (!S_ISBLK(s.st_mode) && !S_ISREG(s.st_mode))) {
1751                         ULOG_ERR("%s is not a block device or file\n", argv[1]);
1752                         return -1;
1753                 }
1754                 err = swapoff(argv[1]);
1755                 if (err) {
1756                         ULOG_ERR("failed to swapoff %s (%d)\n", argv[1], err);
1757                         return err;
1758                 }
1759         }
1760
1761         return 0;
1762 }
1763
1764 int main(int argc, char **argv)
1765 {
1766         char *base = basename(*argv);
1767
1768         umask(0);
1769
1770         ulog_open(-1, -1, "block");
1771         ulog_threshold(LOG_NOTICE);
1772
1773         if (!strcmp(base, "swapon"))
1774                 return main_swapon(argc, argv);
1775
1776         if (!strcmp(base, "swapoff"))
1777                 return main_swapoff(argc, argv);
1778
1779         if ((argc > 1) && !strcmp(base, "block")) {
1780                 if (!strcmp(argv[1], "info"))
1781                         return main_info(argc, argv);
1782
1783                 if (!strcmp(argv[1], "detect"))
1784                         return main_detect(argc, argv);
1785
1786                 if (!strcmp(argv[1], "hotplug"))
1787                         return main_hotplug(argc, argv);
1788
1789                 if (!strcmp(argv[1], "autofs"))
1790                         return main_autofs(argc, argv);
1791
1792                 if (!strcmp(argv[1], "extroot"))
1793                         return main_extroot(argc, argv);
1794
1795                 if (!strcmp(argv[1], "mount"))
1796                         return main_mount(argc, argv);
1797
1798                 if (!strcmp(argv[1], "umount"))
1799                         return main_umount(argc, argv);
1800
1801                 if (!strcmp(argv[1], "remount")) {
1802                         int ret = main_umount(argc, argv);
1803
1804                         if (!ret)
1805                                 ret = main_mount(argc, argv);
1806                         return ret;
1807                 }
1808         }
1809
1810         ULOG_ERR("Usage: block <info|mount|umount|detect>\n");
1811
1812         return -1;
1813 }