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